BKR2O006027 265A
`
`English Title
`ELECTRODE ASSEMBLY EMPLOYINGNEGATIVE ELECTRODE TAP HAVING BENT
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`PART, AND LITHIUMION SECONDARY BATTERY EMPLOYING THE ELECTRODE
`
`ASSEMBLY
`
`Assignee;Applicant
`SAMSUNG SDICO LTD
`
`Inventor
`
`JUN RiYoun, KR
`
`Publication dare (Kind Code}
`
`2006-03-27
`
`{A}
`
`Application number / Date
`KR200476135A / 2004-09-22
`
`Priority number / Date / Country code
`KR2004761954 / 2004-09-22 / KR
`
`Abstract
`
`PURPOSE: Provided is an electrode assembly, and a iithnim ion secondary battery containing
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`the electrode assembly, tn prevent the internal shortage by the contact of the inside part of a
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`can and a negative electrode tap,
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`CONSTITUTION: The electrade assembly comprises a positive electrode plate, a negative
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`electrode plate, a separator, and a positive electrode tap and a negatrre electrode tap combmed
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`with the positive electrode plate and a negative electrode plate, respectively, wherein the
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`negative electrade tap contains a bent part so as to allow the negative electrade tap to be bent
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`at a certam position. Preferably the bent part of the negative electrode tap has a triangndar
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`shape or a semi-circular shape.
`
`© KRIPO 2006
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`

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`Clapms
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`1. For Hchiom ion secondary battery including the anode plate and the cathode tah and the
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`cathode tab cambined respectively in the negative plate, the separator, the negative plate and
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`anode plate, wherein for ithnom ton secondary battery are characterized m that the cathode
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`tab comprise the hent portion in which the cathode rab is curved m the regularly m the fixed
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`position.
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`2. As for claim 1, the electrode assembly in which the bent portion is formed tn both sides of
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`the cathode tab mto the groove shape.
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`3. As for claim 2, the electrode assembly in which the bent portion is formed with the triangle
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`or the semicircular shape.
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`4, As for claim 3, the electrode assembly m which the angular groove of the bent portionis
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`formed within 2556 this of the cathode tab width.
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`5. As for clarm 1, the bent partion is the formed electrade assemblyof the fixed width in the
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`inner side of the cathode tab and the length.
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`6, As for claim 5, the electrode assembly in whichthe bent partion is farmed with the raund
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`square shape, the sqpuare shape, or the rhomboid.
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`7. As fox claim 6, the electrode assembly in which 1.0mm vith, and che length the bent
`portion of the width is formed within 50% this of the cathode tab width.
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`&. As for claim 35, the electrode assembly in which at least 2 holes are separated from the
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`prescribed distance and the bent purtion ts formed.
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`9, As for claim 1, the electrade assemblytn which the bent portion is formed in ane side of
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`the cathode tab into the scratch shape having a predetermined length.
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`10. As for claim.9, the electrode assembly in which che bent portion is formed with the length
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`of at least 50% of the cathode tab width.
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`1}. As for claim 1, the electrode assembly in which one side of the cathode tab is pressed to
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`

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`the fixed length and the widchand the bent portion is formed.
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`12. As for claim 11, the electrode assembly tn which the length the bent portion is formed
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`with at feast 5095 of the cathode tab width.
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`13. The electrode assembly of claim 1, wherein the cathode tab comprises the anade bent
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`portion in which the cathode tab ts regularly curved in the fixed position.
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`14. As for claim 15, the electrode assembly tn which the anode bent portion is formed with
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`the bent portion by any one claim among claim 2 to clanm12.
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`15. The Li-ion secondary batrery which includes the bent portion by any one claunm and im
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`which the cathode tab is formed as to the Li-ion secondary battery including the electrode
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`assembly among claim 2 to claim 12 including the cathode tab and the cathode tab combined
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`respectively in the anace plate, the negative plate, the separator, the negative plate, and anode
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`plate.
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`16, As for clam 15, che Li-lonsecondary bateery which inchides the anode bent pertien by
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`any one claim and tn which the cathode tab is farmed among clanm 2 to claim 12.
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`{Translation from Clarivate)
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`Description
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`Electrode assembly and h-ion secondary battery [Flectrode Assembly and Lithium Ion
`Secondary battery Using the Same] using the same.Background Art
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`The invention relates to the Li-ion secondary battery, especially, t relates to the cathode tab
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`and cathode tab ts the electrode assembly which can prevent bemg curved and circiat-shorted
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`in the inner portion of the can and the Li-ton secondary battery imcliding the samein the
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`certain position the bent portion ts farmed im the fixed position of the cathode tab and cathode
`tab,
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`Generally, as the reduction in weight and high performance conversion af the hand-held
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`wireless device including the video camera, the cellular telephone, the transportable computer
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`etc. are progressed many researches are made on the secondary battery used as the drive
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`power. Such secondary battery has the nickel cadmubattery, nickel-hydrogen electric cell,
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`nickel zinc cell, the lithtur secondarybattery etc for example. The lithium secondary batrery
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`a rechargeable and che miniature and mass storage conversion are possible. [t ts therefore
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`widely used che advantage that the operation voltage is high and the energy density per the
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`unit weight is high in the advanced electronic equipment field.
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`Figure | shows the perspective viewof the electrode assembly used for the Li-ion secondary
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`battery.
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`The electrode assembly used for the Li-ion secondary battery is formed including the anode
`plate (119), and the negative plate (115), the separator (114), the cathode rab (116) and
`cathode tab (1173.
`
`While the separator (114) isserted between the anode plate (113) and negative plate (115)
`the electrode assembly (112) is reeled and it is formed.
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`The either side the anode active material layer in which the anode plate (113) includes the
`lithiated cobalt axwle on the surface of the anode collector formed with the metal of the thm
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`film is costed with the presertbed thickness mav be provided with the anode uncoated area in
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`which the anode active material layer is not coared. In one side of the anode ancoated area,
`the cathode tab (116) is connected electrically and i is protruded to the upper partionof the
`electrode assembly (112),
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`The either side the negative active material layer is costed with the prescribed thickness on
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`the surface of the cathode collector in which the negative plate (1153 is formed with the metal
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`of the chin film may be provided with che cathode uncoated area in which the negative active
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`material layer including carbon is not coated. In oneside of the cathode uncoated area, the
`cathode tab (117) is connected electrically and it is protruded ta the upper portion of the
`electrade assembly(112).
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`In the cathode tab (116) and cathade tab (117) is the can type Li-ion secondary battery, it
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`electrically welds in the cap-plate and terminal plate of the cap assembly with the welding and
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`it welds in the pouch-iype Li-ion secondarybattery in the connecting lead and it is connected
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`electrically in the protecting circuit board.
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`In the can type Li-ion secondarybattery, after the cathode tab (116} and cathode tab (117}
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`weld in above cap assembly 40 is curved mn the fired pasition and it is rnserted mito the can.
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`In the process where the cathode tah and cathode tab are curved, if it is not curved tn the
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`regularlyafter the cathode tab and cathode tab are mserted mto the can tt is contacted with
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`the boner surface or the cap assembly of che can and che short circuit comes mito being.
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`Particularly, if the cathode tab is contacted with the inner surface of the can smece the can is
`connected to the cathode tab the cathode tab and cathode tab are circuit-shorted and the
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`problemis generated.
`Abstract Problem:
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`An object of the present invention are to provide the cathode tab and cathode tab is the
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`electrode assembly which can prevent bemg curved and circuit-shorted in the inner portion
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`of the can and the Li-ion secondarybattery including the same m the certam position the bent
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`portion is farmed in especially, the fired position of the cathode tah and cathode tab to solve
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`the problem described in the above, it is devised.
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`Invention Configuration
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`The electrode assembly of the invention which to solve the above-mentioned subject,
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`is
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`devised is for lithrum. ion secondary battery including the cathode tab combined respectively
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`in the negative plate and anode plate and the cathode tab comprise the bent portion in which
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`the cathode tab the cathede tab ts regularly curved in the fixed position.
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`Moreover, in the present invention, the bent portion formed in the cathode tab can be formed
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`in both sides of the cathacle tab into the groove shape and tt can be formed with the triangle
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`or the sernicircular shape. Moreover, it is desirable that the angular groove of the bent portion
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`is formed within 256 this of the cathode tab width.
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`Moreover, im the present invention, the bent partion formed in the cathode tab canbe alone
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`formed tn the inner side of the cathode tab of the fixed width and the length and the bent
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`portion can be formed inte the round square shape, the square shape, or the rhombord.
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`Moreover, it is desirable that L.Qmm with, and the length the hent portion of the width is
`formed within 5096 this of the cathode tab width. Moreover, at feast 2 holes are separated
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`from che prescribed chstance and the bent portion can be formed.
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`Moreover, in the present invention, the bent portion can be formed in one side of the cathade
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`tab into the scratch shape having a predetermined length and it is desirable that the benr
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`

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`portion is formed with che lengthof at least 5096 of the cathode tab width.
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`Moreover, in the present invention, one side of the cathode tab is pressed to the fined length
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`and the width and che bent portioncan be formed and it is desirable that che length the bent
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`portion is formed with at least 50% of the cathode tab width.
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`Moreover, in the cathode tab of the electrode assembly according te the present mventian,
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`the cathode tab the fixed position, the anode bent portion which the regularly is curved is
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`included and it can be formed. At this time, it can he formed with the bent portion in which
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`the anode bent portion ts formed in the cathode tab of one shape.
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`Moreover, as to the Li-ion secondary battery in which the f-ion secondary hatrery according
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`to the Invention mclides electrode assembly inchiding the cathede tab combmed respectively
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`in the negative plate and anode plate and cathode tab, the bent portion in which the cathode
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`tab is formed inte one shape of the bent portion described m the above is imcluded and the
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`bent portion is farmed. Moreover, in the Li-ien secondary battery, the anode bent portion
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`formed with one shape of the bent portion im which the cathode tab is formed in the cathode
`tab is included and rt can be formed.
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`The attached preferred embodiment according to the present invention decides to be
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`heremafter particularly explamed.
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`Figure 2 shows the perspective view of the electrode assembly according to a preferred
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`embodiment of the present invention. Figure 3 shows the front wewof the cathode tab
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`according to the embodiment 1 of the mvention. Figure 4a shows the front viewof the cathode
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`tab according to the embodiment 2 of the invention. Figure 4b shows the A-A cross-sectional
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`viewof the drawing 4a. Figure 5 shows the front view of the cathode tab m the aperation 3 of
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`the invention. Figure 6a shows the front viewof the cathode tah in the embodiment 4 of the
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`invention. Figure 6b shows the B-B cross-sectional viewof the drawing Ga. Figure 7a shows
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`the front viewof the cathede tab in the embodiment 5 of the invention. Figrue 7b shows the
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`C-Ccross-sectional view of the drawing 7a. Figure & shows thefront viewof the cathode tab
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`according to the embodiment 6 of che mnvention. Figure 9 shows the isalation perspective view
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`of the can type Li-ion secondary battery according to a preferred embodiment of the present
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`invention, Figure 1) shows the broken section of the can type Li-ion secondarybattery in
`which the cathode tab of the invention is mounted.
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`

`

`Referring to Figure 2, the electrode assembly (212) according to the present inventionis
`formed inchiding the anade plate (213), and the negative plate (215), the separator (214),
`the cathode rab (216! and cathede tab (217),
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`While the separator (214) is mserted between the anode plate (213) and negative plate (215)
`the electrade assembly (212) is reeled and ir is formed. The either side the anode active
`material layer in which the anode place (213) includes the fithnim oxide on the surface ofthe
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`anode collector formed with the metal of the thin filmis coated with the prescribed thickness
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`may be provided with the anode uncoated area in which the anode active material layer is not
`coated. In oneside of the anode uncoated area, the cathode tab (216) is connected electrically
`and it is protruded to the upper portion of the electrode assembly (212). Theeither side the
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`negative active material layer is coated with the prescribed thickness on the surface of the
`cathode collector in which the negative plate (215) is formed with the metalof the chin film
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`may be provided with the cathode uncoated area im which the negative active material layer
`including carbon is not coated. In one side of the cathode uncoated area, the cathode tab (2173
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`a commected elecerically and mt is protruded te the upper portion of the electrade assembly
`(212),
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`The bent partion (219) which the bend guide serves se that the cathade tab (217) is curved
`in the fixed position in the certain position is formed at the cathode rab (217). The benr
`portion (219) may be formedat the various shapes the location from which the cathode tab
`(217) it can be formed is curved. Generally, the burglar is weak since the cathode tab (317) ts
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`formed with the sheet metal of about 0.1mm. Therefore, it is necessary to minimize that the
`intensity of the cathode tab (217) is degraded with the bent partion (219) andit is desirable
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`to form into the proper size according to the farmed shape.
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`It is formed im bothsides of the location from which the bent portion (2194), is the cathode
`tab (217) with reference to the embodiment 1, of fig. 3 is curved inte the groove. Here the
`shape is not hmited while the bent portion (2192) can be formed with the triangle or the
`hemispherical groove, Moreover, since the guide role is se that the cathade tab (217) ts curved
`in the certain position the benr portion (219a} is formed with the proper size. Preferably, the
`length of the angular groove af the bent portion (219a} forms within 25%this of the cathode
`tab (217) width and is prevents the intensity af the cathode tab (217) being weak and
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`sectioned in the process of the after and the process of bemg curved.
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`ic alone is formed inside of the location froma which the bent portion (219b}, is the cathode
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`

`

`¢
`tals (217) with reference to the embodiment 2, of figures 4a and 4bts curved ofthe fixed wideh
`and the length. Here the shape is not Himited while the bent portion (219b) can be alone
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`formed of the round square shape, and the square shape or the rhomboid. Moreover, since
`the guide role is so that the cathade tab (217) is curved in the certam positionthe bent portion
`{2196} is formed with the proper size. Preferably, LOmm within, and the length the bent
`portion (2196) of the width is formed within 50%this of the cathude rab (217) width and the
`intensity of the cathode tab (217) is weak and it minimizes in the process of the after and the
`process of being curved that the cathode tab (217) is sectioned,
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`At least 2 holes are located in the width direction of the cathode tab (217) with the prescribed
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`distance and it is formed with reference to the embodiment 3 offig. 5. lt minimizes preferably
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`the diameter or the width the bent portion (219c) of the hole formmg within }.Gmmthis and
`the intensity of the cathode tab (217) being weak and sectionedin the pracess ofthe after and
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`the process of being curved.
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`In the meantime, the bent portion shape of figures 3 and 4a ar figures 3 and 5 is combined
`and the bent portion (219) can he formedit is of course.
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`leis farmed with the scratch shape of che fixed width accordmg to the line curved in one side
`of the location from which the bent portion (219d), is the cathode rab (217) with reference
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`to the embodiments4, of figures 6a and 6b is curved. It prevents the scratch depth of the bent
`portion (219d) forming within 20% this of the cathode tab (217) thickness and the cathode
`tab (217} from being sectioned among the welding and lead forming. The preferably the bent
`portion {219d} is formed with the width and the same length of the cathode tab while the
`length is formed withat least 50% of the cathode tab (217) width. The depth is not deep since
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`the bent portion (219d) is formed with the scratch shape. Therefore, if the length of the bent
`portion (219d) is formed over at least 50% of the cathode tab (217) widththen it serves of
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`the bend guide,
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`leas pressed in to the lnnearly according to the line im which one side of the location fram
`which the bent portion (2149e}, is the cathode tab (217) with reference to the embodiment5,
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`of figures 7a and 7b is curved ts curved andthe line is formed. Therefore, the other side of the
`cathode tab (217} maybe provided with the protrusion part. The preferably the bent portion
`(219) is formed with the width and the same length of the cathode tab (217) while the length
`is formed with at least 50% of the cathode tab (217) width. Since it is pressed to the fixed
`width and the bent portion (219e} is formed the depthis not deep. Therefore, if the length of
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`

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`the bent portion (21%) is formed over at least 50% of the cathode tab (217) width then it
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`serves of the bend guide.
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`Descontinucus and formed at least 2 prescription roads are formed with the groove with
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`reference to the embediment 6 of fig. 8 accordingta the Hine in which the cathode tab (217)
`is curved, As shown in Figure 7a, the groove of the bent portion (219f) can be formed by
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`scratch or the indentation with 6a. There the limit is no length of the angular groove forming
`the bent portion (2198) but the toral lengrh is formed mto at least 50% of the cathode tab
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`(217) width,
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`Moreover, the anode bent partion (218) which the bend guide serves can be formed m the
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`cathode tab (216} so that the cathode tab (216) is curved in the certain position. Tt can be
`formed with one among the bent portion shape formed an the anode bent portian {218} is the
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`figures 3 through8.
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`The cathode tab (217) and the cathode tab (216) in which the anode bent portion (218) is
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`formed can be apphed te the can type Li-ten secondary battery or the pouch-tvpe Li-ion
`secondarybattery the bent portion (219) accerding to the present invention is formed,
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`Hereinafter, it describes the can type Li-ion secondary battery equipped with the electrode
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`assembly applying the cathode tab mn which the bent portion is formed,
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`Figure 9 shows the disassembled perspective view of the can type Li-ion secondary bairery.
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`Bat fig. 9 may be the embodiment of the can type Li-ion secondary battery. And here the kind
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`is not limited. Therefore, the cathode tab im which the bent portion ts formed can be applied
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`io various secondary batteries formed with the can type it is of course.
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`The can type Li-ion secondary battery, referring to Figure 9, the can (210}, the electrode
`assembly (212) received side the can (210), and the cap assembly (220) sealing the top
`opening (210a) ofthe can (210) hermeticallyare included and tis formed.
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`ft is farmed with the metal in which the can (210) has approximately, the box type and it is
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`formed with ahunimum or che aheminum alloy preferably hght and mn which it has the flextble
`but here the kind is not hmited. The top opening (210a) in which the one side the can (210)
`is opened is included and the electrode assembly (212) is received thraugh the top opening
`£2108).
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`

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`The electrode assembly (212) comprises the anode plate {213}, the negative plate (215), and
`the separator (214). After the anode plate (213} and negative plate (215) interpose the
`separator (214) and it is laminated it can be reeled in the formof the jelly-roll. In the anode
`plate (213), the cathade cab (216) welds and che end of the cathode tab (216)is protruded to
`the upper direction of the electrode assembly (212}. The cathode tab {217} welds in the
`negative plate (215) and the endof the cathode tab (217) is protruded to the upper direction
`of the electrode assembly (212). The fixed position of the cathode tab (217) may be provided
`with the bent portion (219) in which the cathode rab (217) is curved in the certain position,
`Moreover, the fixed position of the cathode tab (216) may be provided with the anode bent
`portion (218) m which the cathode tab (216) is curved in the certainposition.
`
`Above cap assembly (220) comprises the cap-plate (240), the insulating plate (250}, the
`terminal plate (260) and electrode termmal (230}. The cap assembly (220} is combined in
`the top opening (210a} of the can (210) and the can (219)is sealed hermetically.
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`Weld in above cap plate (240) and the cathode tab (216} is connected electrically and it welds
`in the terminal plate (260) and the cathode tab (217} is connectedelectrically.
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`in the rneantime, accordmmg to the anode plate (213) of the electrode assembly (212) and
`negative plate (215) and cathode tab (216) and cathode tab (217) is the kinds, ic can be
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`formed itis on the contrary of course.
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`While bemg formed with the metal plate of the shape and size cerresponding to above cap
`plate (240) is the top opening (210) of the can (210) the metalplate is formed inte aluminura
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`or the aluminum alloy im which preferably the weight is light. The rerminal through-hole 4
`{241} ofthe fixed level is formed in the center of above cap plate (240). And one side maybe
`provided with the elecrrolyte-injection hole (242). In the terminal through-hale 4 (241), the
`electrode terminal (230) is inserted and the gasket tibe (246) ofthe tube type is assembled
`
`in the inner surface of the terminal chrough-hole 4 (241) for the insulation of the cap-plate
`(240) and electrode terminal (230).
`
`After above cap assembly (220) is assembled in the top opening (210a) ofthe can (210) the
`electrolyte is injected through the electrolyte-injection hole (242) and the electrolyte-
`injection hole (242) is shut tightly by che separate closing means.
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`The lower-side the insulating plate (250) ts formed with the insulating material hke the gasket
`
`may be provided with the seating graove (252) on which the termimal plate is mounted. The
`terminal through-hole 5 (251) mthe corresponding position in the termmal through-hele 4
`(2413 of above cap plate (240) is formedin one side of the msulating plate (250). And the
`electrode terminal (230) is mserted.
`
`The terminalplate (260)is formed with the Ni alloy and it is combinedin the seating groove
`{252} of the msulating plate (250). The terminal through-hole 6 (261) in one side in the
`corresponding position in the terminal through-hole 4 (241) of the cap-plate (240)is formed
`in ane side of the terminal plate (260). And the electrode terminal (230) is mserted.
`
`While the electrode terminal (230) is insulated with the gasker rube (246) ix is mserted
`through the terminal through-hole 4 (241), the termmal through-hole 5 (251) and terminal
`through-hole 6 (261) and it is combined with the terminal plare (260). Therefore, in above
`cap assembly (220)), it is connected electricaily with the electrede terminal 2303 while the
`terminal plate (260)is electrically insulated with above cap plate (240),
`
`The insulationcase (270) is formed including the cathacle tab hele £27 13 and cathode tab hele
`(272) and it is combined in the lower part of above cap assembly (220) and above cap
`assembly (220) and electrode assembly (212} are insulated electrically. The cathode tah (216)
`passes throagh the cathode tab hole (271) and it welds in above capplate (240). Moreover,
`the cathode tab (217) welds th rough the cathode tab hole (272) in the ternsinal plate (260).
`
`Next describes the action of the secondary battery according to the present invention.
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`Figure 10 shows the broken section after the cap assemblyis assembled tn the can type Li-ion
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`secondary battery equipped with the electrode assembly in which the cathode tab in which
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`the bent portion is formed according to the invention Is applied in the can.
`
`The cathede tab (216) and cathode tab (217) of the electrode assembly (212) weld im the
`fixed position of the termmal plate (260) and respective above cap plate (240). The electrode
`assembly {212} is mserted ta the inner portion of the can (210) and while the cathode tab
`(216) and cathode tab (217) are curved in figure 90 in the fixed position the cap assembly
`{220} connectedto the electrode assembly (212) consists of the horizontal direction and #is
`combined in the upper end portion of the can (210). At
`this time, since it is curved m
`approximately, figure 90 with bent portions (218, 219) formed in the certam position m which
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`

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`the cathede tab (216) and cathode tah (ZIT) have to be curved the cathode tab (217) and
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`cathede tab (216) are not contacted with the inner side of the can (21). Therefore,
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`it
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`prevents the short circufrom coming into being withm the can (210) between the anode
`and cathode. After above cap assembly (220) is assembled in the top opening (210a) of the
`can {210} it welds and the can (210) is completely shat rightly.
`
`As described above, the inventionis not restricted im the above-descrthed specific preferred
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`embodiment and if without deviating fromthe gist of the invention claimed imthe patent
`
`claim it experiences and it grows up under the technical Field of the Invention it is tn the
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`range of of that kind of change silver parent claum descriptien or the anyone. Vartous
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`deformations of operations are possible.
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`Advantageous Effects
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`There can be the effect that can prevent by being curved that the inner side and cathede tab
`
`of the can are contacted and the mternal short-circuit is generated as 90 is the extent after the
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`bent portions is formed in the fixed position of the cathode tab and the cathode tab welds
`
`according to the Li-ion secondary battery according to the present invention in the cap
`
`assembly the bent portion is curved.
`
`Moreover, the hent partion formed on according to the invention, the cathode tab and cathode
`tab have the effect that the bend of the cathode tab and cathode tab is facticated and the lead
`
`forming time can be cur down and the dissemination of the folding position can be reduced.
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`Drawing Description
`
`Figure | is a perspective viewof the conventional electrode assembly.
`
`Figere 2 is a perspective viewof the electrode assembdy according to the embodiment of the
`TPWentiay,
`
`Figure 3 is a frent wiew of the cathode tab according to the embodiment | of the invention.
`
`Figure 4a is a frent view of the cathode tab according to the embaciment 2 of the mvention.
`
`Figure 4b is a A-A cross-sectional view of the drawing 4a.
`
`Figure 3 is a front view of the cathode tab in the operation 3 of the invention.
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`

`

`Figure 6a is a front view of the cathocle tab in the embodiment 4 of the invention.
`
`Figere Gb ts a B-B cross-sectional viewof the drawing 6a.
`
`Figure 7a is a front view of the cathodetah in the embodiment 3 of the invention.
`
`Figure 7b is a C-Ccross-sectional view of the drawing Ta.
`
`Figare 8 is a front view ofthe cathode tab according to the embodiment6 of the invention.
`
`Figure 9 is an isolation perspective viewof the can type Li-ion secondarybattery according to
`the embodiment of the mvention.
`
`Figere 10 is a broken section of the can type Li-ton secendary battery in which the cathode
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`<The description of reference numerals showmg the mam elements m drawimgs>
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`210- can 212 - electrode assembly.
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`216- cathode tab 417 - cathode tab.
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`218 - anade bent portion.
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`21%a, 2196, 291c, 219d, 219e, 219f - bent portion.
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`220
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`240 - cap-plare 250 - insulating plate.
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`260 - terminal plate.
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`(Translation from Clarivate}
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