* NOTICE *
`
`JPO and INPIT are not responsibie for any damages caused by the useof this translation.
`
`4. This document has been translated by computer. So the translation may not reflect the original precisely.
`
`2. “** shows a word which cannot be translated.
`
`3. In the drawings, any words are not translated.
`
`Publication Number
`
`JPH07254402A
`
`Bibliography
`
`(19) [Publication country] JP
`
`(12) [Kind of official gazette] A
`
`(11) [Publication number] 07254402
`
`(43) [Date of publication of application] 19951003
`
`(54) [Title of the invention] SEALED BATTERY
`
`(51) [international Patent Classification 6th Edition]
`
`HOIM 2/34
`
`#HOIM 2/12
`
`(21) [Application number] 06068988
`
`(22) {Filing date] 19940315
`
`(71) [Applicant]
`
`[Name] TOSHIBA BATTERY CO LTD
`
`(72) [Inventor]
`
`[Full name] HANABUSA SOICHI
`
`[Full name] ISHIHARA YOU!
`
`Abstract
`
`(57) [Overview]
`
`PURPOSE: To prevent burst or ignition of a battery at the time of over-charging/
`
`discharging, or short-circuiting by providing a lead between a power generation element
`
`and an insulation plate, and welded with a protrusion of a safety plate, and cutting it by
`
`deformation of the safety valve plate when a battery inner pressure rises.
`
`CONSTITUTION: A terminal plate of a sealing body group, an overcurrent/overheat
`
`

`

`protective element 22, and a safety valve plate 23 are held by an insulation sealing
`
`packing 23, and a protrusion 27 at a center of the valve plate 23 is protruded through a
`
`center hole 28 of an insulation plate 25. Lead 26 from an electrode group is welded with
`
`the protrusion 27, and an insulation plate 25 is fixed by a beat part of an outer can, so
`
`scattering of contents of the electrode group is prevented when the valve plate 23 is
`
`actuated to release an inner pressure. At the time of abnormality, when the battery inner
`
`pressure rises, the valve plate 23 is deformed upward, and because the insulation plate
`
`25 has no deformation by the inner pressure because of the center hole 28, the lead 26
`
`is cut at a welded part to cut the current. In the case where the battery inner pressure
`
`rises because of over-charging/discharging, or short-circuiting, the current is cut, thereby
`
`burst or ignition can be prevented preliminarily without giving any effects on peripheral
`
`parts.
`
`Claim
`[Patent Claims]
`
`[Claim 1]
`
`In the sealed battery, a power generating element composed of a positive
`
`electrode, a separator and a negative electrode and a sealing body group having a safety
`
`valve plate deformed when the internal pressure of the battery is increased are welded
`
`by a lead wire led out from the power generating element.
`
`The lead wire is interposed between a power generating element and an insulating plate
`
`and welded to a safety valve plate, and the welding is broken by the insulating plate when
`
`the internal pressure of the battery is increased.
`
`{Claim 2] A sealed battery according to claim 1, further comprising: a safety valve plate
`
`which is deformable upward by an internal pressure and has a projection at a center
`
`thereof; a fixed insulating plate having a center hole; and a lead wire, wherein the
`
`projection and the lead wire are welded at the center hole.
`
`[Claim 3] A sealed battery according to claim 7 or 2, wherein said safety valve plate is
`
`provided with a mark to facilitate displacement.
`
`Description
`{Detailed description of the invention]
`
`{0001}
`
`[industrial field of application] The present invention relates to an improvement in a
`
`sealing body group of a cylindrical battery.
`
`{0002}
`
`[Prior art]
`
`in recent years, development of
`
`the rechargeable battery using the
`
`

`

`nonaqueous electrolyte in which small lightweight and an energy density are high, and
`
`charge and discharge are repeatedly more possible still is demanded with development
`
`of an electronic device. As this type of secondary battery, one using lithium or lithium
`
`alloys as a negative electrode active material and using oxides, sulfides, selenides, and
`
`the like of molybdenum, vanadium, titanium, niobium, and the like as a positive electrode
`
`active substance is known. [n recent years, studies on spinel-type LiMin2 O04 and other
`
`lithium manganese oxides, which improve and enhance the cycle characteristics of
`
`manganese oxides having high energy density, have been actively conducted. However,
`
`in the battery system as described above, dissolution and deposition reactions of lithium
`
`as a negative electrode active material are repeated by repeating charge and discharge
`
`cycles, and a needle-like lithium dendrite deposit is formed on a lithium substrate, which
`
`causes an internal short circuit.
`
`[O003]Further,
`
`in the battery as described above, at the time of abnormality such as
`
`overcharge, overdischarge, or short circuit, gasification of the electrolytic solution occurs,
`
`and explosion or ignition may occur due to an increase in the internal pressure of the
`
`battery. in order to solve such a problem, conventionally, a method of providing a safety
`
`valve plate in the sealing body group and releasing the increased internal pressure by
`
`valve operation has been adopted. Further, in order to prevent the contents from being
`
`discharged when the safety valve is operated, an insulating plate made of an insulating
`
`material and having a gas vent hole is provided at the upper end of the electrode group
`
`to enhance safety.
`
`{0004}
`
`{Problem to be solved by the invention] However, with only the safety valve structure as
`
`described above, although the danger of the battery itself is reduced at the time of valve
`
`operation, in the case where the battery is built in an electronic device or the like, the
`
`device is filled with a vaporized electrolytic solution, which not only damages the
`
`surrounding devices but also may cause explosion or ignition. Therefore, the internal
`
`pressure rise of the battery is stopped before the safety valve operates.
`
`Such a mechanism has been sought.
`
`{O005]The present invention has been made in view of the above problems, and it is an
`
`object of the present invention to provide a current interruption mechanism which breaks
`
`a lead wire in a battery due to an increase in the internal pressure of the battery when
`
`the battery has an abnormality such as overcharge, overdischarge, or short circuit, and
`
`stops the increase in the internal pressure before a safety valve is actuated.
`
`{O006}
`
`

`

`[Means for solving the problem] In the sealed battery, a power generating element
`
`composed of a positive electrode, a separator and a negative electrode, and a sealing
`
`body group having a safety valve plate deformed when the internal pressure of the
`
`battery rises are welded by a lead wire led out from the power generating element. The
`
`lead wire is interposed between the power generating element and the insulating plate
`
`and welded to the safety valve plate, and the welding is broken by the insulating plate
`
`when the internal pressure of the battery is increased.
`
`{O007)A detailed structure of the present invention is a sealed battery comprising a safety
`
`valve plate which can be deformed upward by an internal pressure and has a protrusion
`
`at its center, a fixed insulating plate having a center hole, and a lead wire, wherein the
`
`protrusion and the lead wire are welded at the center hole.
`
`{0008}
`
`[Action and effect] The safety valve plate has a downward projection at its center, and
`
`the projection is welded to a lead wire from the power generating element at the center
`
`hole of the insulating plate. Further, an insulating plate is arranged and fixed under a
`
`beat part provided for mounting the sealing body group on the outer can, the scattering
`
`of the content such as the electrode group is prevented at the time of valve operation,
`
`and at the sametime, the lead wire is broken from the safety valve plate. The lead wire
`
`passes between the power generating element and the insulating plate, and is welded
`
`to the projection of the safety valve plate at the center hole.
`
`[O009jin the present invention, the safety valve plate is abnormally deformed upward
`
`when the internal pressure of the battery is increased, and the lead wire is pressed by
`
`the insulating plate, so that the weld is broken. An abnormal current can be cut off by the
`
`breakage.
`
`{0010}
`
`[Examples] An embodimentof the present invention will be described with reference to
`
`FIGS.
`
`1
`
`to 5. The positive electrode is prepared by adding a conductive agent and a
`
`binderto lithium and manganese composite oxides (LiIMnO2), mixing them, applying the
`
`mixture to an aluminum substrate, and drying the mixture to form a sheet. In the negative
`
`electrode, metal lithium is press-bonded to a copper substrate. A positive electrode and
`
`a negative electrode are wound through a separator of a polypropylene porousfilm to
`
`form an electrode group (12). Lithium hexafluorophosphate (LIPF6) by dissolving lithium
`
`hexafiuorophosphate () in a mixed solution of propylene carbonate and diethyl carbonate
`
`ina volumetric ratio of 50:50, and the resulting solution is poured into a cylindrical outer
`
`can (11) housing a group of electrodes (12). Next, the sealing body group (13) was
`
`inserted up to the beat portion (14) of the outer can (11} and caulked and sealed to
`
`

`

`produce a cylindrical cell having an outer 18mm, a height 50mm, and an electric
`
`capacitance 1500mAHas shownin FIG. 14.
`
`{O011]FIG. 2 is an enlarged sectional view of a sealing portion of the battery.
`
`A terminal plate (21), an overcurrent overheat protection element (22) and a safety valve
`
`plate (23) of a mouth group are held by an insulating sealing packing (24), and the safety
`
`valve plate (23) has a projection (27) at its center, which projects through a center hole
`
`(28) of an insulating plate (25) and is welded to a lead wire (26) from an electrode group.
`
`{0012]The insulating plate (25) is disposed on the lower surface of the bead portion (14)
`
`of the outer can (11) in order to prevent the contents such as the electrode group (12)
`
`from scattering when the internal pressure is released by the operation of the valve, and
`
`a lead wire (26) from the electrode group and a projection (27) of the safety valve plate
`
`(23) are welded at a central hole (28) of the insulating plate (25). In order to facilitate the
`
`welding of the projections 27 to the lead wires 26, the projections 27 have lengths 3mm
`
`and diameters 2mm, and their tips are positioned under the insulating plate and are
`
`welded at that position.
`
`{OO43]As shown in FIG. 3, when the internal pressure of the battery is increased, the
`
`safety valve plate (23) is deformed upward by the internal pressure. Since the insulating
`
`plate (25) fixed by the beat portion (14) has the central hole (28), it is not deformed by
`
`the internal pressure, so that the iead wire (26) cannot move upward. Therefore, when
`
`the safety valve plate (23) is deformed upward by the internal pressure, the welding with
`
`the lead wire is broken, and the abnormal current is interrupted. The safety valve plate
`
`(23) used in the present invention has an engraved mark (41) as shown in FIG. 4 so as
`
`to be easily deformed upward, and is provided with a thin portion so as to be easily bent
`
`and to be easily cleaved to release the internal pressure to the outside.
`
`[0014]Next, as a comparative example, as shown in FIG. 5, a cylindrical battery was
`
`produced in the same manner as in the example except that a safety valve plate (51)
`
`having no central protrusion was used, and a sealing body group having a structure in
`
`which the lead wire (53) cannot be broken bythe insulating plate (52) even if the safety
`
`valve plate (51) is deformed upward when the internal pressure is increased was used.
`
`jO015}]These batteries were housed in a sealed type holder for batteries made of
`
`polypropylene and subjected to a 3A overcharge test, a 1A overdischarge test and an
`
`external short-circuit test, and the numberof batteries with current interruption is shown
`
`in Table 1, the number of operated gas discharge vaives is shown in Table 2, the number
`
`of deformed holders is shown in Table 3, and the numberof ruptured orfired batteries is
`
`shown in Table 4.
`
`

`

`[0016]
`
`[Table 1]
`
`[0017]
`
`[Table 2]
`
`[0018]
`
`[Table 3]
`
`[0019]
`
`[Table 4]
`
`{OO20}in these tests, the batteries of the present invention cut off the current only by
`
`small deformation of the safety valve plate in the battery, and the safety valve did not
`
`operate so as to discharge a large amount of gas, but all of the batteries of the
`
`comparative examples operated the valve, deformed the holder, and burst and ignited
`
`by the generated gas or the vaporized electrolyte. The present invention can be applied
`
`not only to cylindrical and prismatic primary and secondary non-aqueous electrolyte
`
`batteries but also to alkaline primary and secondary batteries, sealed lead-acid batteries,
`and the like.
`
`{0021}
`
`[Effect of the Invention] As described above,
`
`in the sealed battery provided with the
`
`current interruption mechanism of the present invention, when the battery is placed in a
`
`state in which the internal pressure of the battery increases due to overcharging,
`
`overdischarging, short-circuiting, or the like, the lead wire in the battery is broken before
`
`the safety valve is operated, and explosion and ignition can be prevented without
`
`affecting the peripheral portion of the battery.
`
`[Brief Description of the Drawings]
`
`[Fig. 1]lt is a cross sectional view of the sealed type cell which is an Example of the
`
`present invention.
`
`[Fig. 2]it is an expanded sectional view of the obturation portion of the cell of the present
`
`

`

`invention.
`
`[Fig. 3]FlG. 10 is a structural view of the insulation plate of the present invention when
`
`the lead wire is broken from the safety valve plate.
`
`[Fig. 4]lt is one example of the stampof a safe ports plate.
`
`[Fig. 5]FIG. 10 is a cross-sectional view of a sealing portion of a conventional
`
`comparative battery.
`
`[Explanation of letters or numerals]
`
`43
`
`14
`
`23
`
`25
`
`26
`
`2?
`
`28
`
`41
`
`Obturation Object Group
`
`Beat Part
`
`Safe Ports Plate
`
`Electric Insulating Plate
`
`Lead
`
`Projection
`
`Central Hole
`
`Stamp
`
`

`

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