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JP5590110B2 - Power storage device - Google Patents

Power storage device Download PDF

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JP5590110B2
JP5590110B2 JP2012279104A JP2012279104A JP5590110B2 JP 5590110 B2 JP5590110 B2 JP 5590110B2 JP 2012279104 A JP2012279104 A JP 2012279104A JP 2012279104 A JP2012279104 A JP 2012279104A JP 5590110 B2 JP5590110 B2 JP 5590110B2
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conductive plate
rigidity
negative electrode
electrode
positive electrode
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JP2014123490A (en
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俊雄 小田切
泰有 秋山
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Toyota Industries Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
    • H01G11/12—Stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/66—Current collectors
    • H01G11/72—Current collectors specially adapted for integration in multiple or stacked hybrid or EDL capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Description

本発明は、蓄電装置に関する。   The present invention relates to a power storage device.

下記特許文献１，２に記載されるように、正極と負極とによって形成された電極組立体を備える蓄電装置が知られている。これらの蓄電装置において、電極組立体は、正極と負極とがセパレータを介して重ね合され、巻回されることにより形成されている。正極と負極のそれぞれは、金属箔の両面に活物質層が形成されて成る。特許文献１に記載の蓄電装置では、正極と負極の各金属箔を露出させた露出部分が巻回体の外周に設けられている。特許文献２に記載の蓄電装置では、正極と負極の各金属箔からなる導電材によって、電極組立体の外周が覆われている。   As described in Patent Documents 1 and 2 below, a power storage device including an electrode assembly formed by a positive electrode and a negative electrode is known. In these power storage devices, the electrode assembly is formed by superposing and winding a positive electrode and a negative electrode through a separator. Each of the positive electrode and the negative electrode is formed by forming active material layers on both surfaces of a metal foil. In the power storage device described in Patent Document 1, exposed portions where the metal foils of the positive electrode and the negative electrode are exposed are provided on the outer periphery of the wound body. In the power storage device described in Patent Document 2, the outer periphery of the electrode assembly is covered with a conductive material made of metal foils of a positive electrode and a negative electrode.

これらの蓄電装置では、蓄電装置を圧潰させる力が加わったり、蓄電装置に釘等が刺さったりした場合に、正極露出部分と負極露出部分との間、あるいは、正極導電材と負極導電材との間で短絡電流が流れる。このように、活物質層が形成されない導電体において短絡電流が流れるようにすることにより、蓄電装置の発熱が抑制される。   In these power storage devices, when a force for crushing the power storage device is applied, or when a nail or the like is pierced into the power storage device, between the positive electrode exposed portion and the negative electrode exposed portion, or between the positive electrode conductive material and the negative electrode conductive material. A short-circuit current flows between them. In this manner, heat generation of the power storage device is suppressed by allowing a short-circuit current to flow in a conductor in which an active material layer is not formed.

特開平１１−２３３１４９号公報JP-A-11-233149 特開２００３−１４２０６８号公報JP 2003-142068 A

正極導電材と負極導電材との間に短絡電流を流すためには、圧潰が生じたとき又は釘が刺さったときに、正極導電材と負極導電材との間に配置された絶縁部材が破れることが必要である。上述した従来の蓄電装置では、圧潰が生じたとき又は釘が刺さったときに、絶縁部材が適切に破れずに、活物質層が形成された正極と負極との間で短絡電流が流れるおそれがある。その場合、いわゆる熱暴走が生じる可能性があり、安全性の面で問題がある。   In order to cause a short-circuit current to flow between the positive electrode conductive material and the negative electrode conductive material, the insulating member disposed between the positive electrode conductive material and the negative electrode conductive material is broken when crushing occurs or a nail is pierced. It is necessary. In the conventional power storage device described above, when crushing occurs or a nail is pierced, the insulating member may not be appropriately broken, and a short-circuit current may flow between the positive electrode and the negative electrode on which the active material layer is formed. is there. In that case, so-called thermal runaway may occur, which is problematic in terms of safety.

本発明は、絶縁部材が確実に破れるようにし、安全性を向上させることができる蓄電装置を提供することを目的とする。   An object of the present invention is to provide a power storage device that can reliably break an insulating member and improve safety.

本発明の蓄電装置は、ケースと、ケース内に収容された電極組立体と、ケースと電極組立体との間に配置された第１導電板と、ケースと第１導電板との間に配置された第２導電板と、第１導電板と第２導電板との間に配置された絶縁部材と、を備え、電極組立体は、正極と、負極と、正極と負極との間に配置されたセパレータと、を備え、第１導電板が、正極及び負極の一方と電気的に接続されており、第２導電板が、正極及び負極の他方と電気的に接続されており、第１導電板の剛性が、電極組立体の正極及び負極のうち第１導電板に最も近接する正極または負極の剛性よりも高く、かつ、第１導電板の剛性が第２導電板の剛性よりも高く、ケースと第２導電板との間に配置された第３導電板と、ケースと第３導電板との間に配置された第４導電板と、第３導電板と第４導電板との間に配置された第２絶縁部材と、を更に備え、第３導電板が、正極及び負極の一方と電気的に接続されており、第４導電板が、正極及び負極の他方と電気的に接続されており、第１導電板の剛性が、第２導電板の剛性、第３導電板の剛性、及び第４導電板の剛性のいずれよりも高い。 A power storage device according to the present invention includes a case, an electrode assembly housed in the case, a first conductive plate disposed between the case and the electrode assembly, and a space between the case and the first conductive plate. And an insulating member disposed between the first conductive plate and the second conductive plate, and the electrode assembly is disposed between the positive electrode, the negative electrode, and the positive electrode and the negative electrode. The first conductive plate is electrically connected to one of the positive electrode and the negative electrode, the second conductive plate is electrically connected to the other of the positive electrode and the negative electrode, The rigidity of the conductive plate is higher than the rigidity of the positive or negative electrode closest to the first conductive plate among the positive and negative electrodes of the electrode assembly, and the rigidity of the first conductive plate is higher than the rigidity of the second conductive plate. And a third conductive plate disposed between the case and the second conductive plate, and a third conductive plate disposed between the case and the third conductive plate. A conductive plate, and a second insulating member disposed between the third conductive plate and the fourth conductive plate, wherein the third conductive plate is electrically connected to one of the positive electrode and the negative electrode, The fourth conductive plate is electrically connected to the other of the positive electrode and the negative electrode, and the rigidity of the first conductive plate is the rigidity of the second conductive plate, the rigidity of the third conductive plate, and the rigidity of the fourth conductive plate. Higher than either.

この蓄電装置によれば、ケースの内側に第２導電板が配置され、第２導電板の内側に第１導電板が配置される。第２導電板と第１導電板との間には絶縁部材が配置される。ここで、第１導電板の剛性が、電極組立体の正極及び負極のうち第１導電板に最も近接する正極または負極の剛性よりも高いため、第１導電板よりも内側の部分すなわち電極組立体は、外部から加わる力に対して変形しにくい。また、第１導電板の剛性が第２導電板の剛性よりも高いため、第２導電板は、外部から加わる力に対して比較的変形しやすい。よって、圧潰が生じたとき又は釘が刺さったときに、第１導電板と第２導電板との間に配置された絶縁部材が破れやすい。したがって、この蓄電装置によれば、絶縁部材が確実に破れ、安全性を向上させることができる。さらに、正極及び負極にそれぞれ接続された２枚の導電板と、その間に配置された絶縁部材とによって形成される３層構造の短絡部が、複数設けられる。複数の短絡部のうち、電極組立体に最も近接する短絡部の第１導電板の剛性が、他の第２導電板、第３導電板、第４導電板の剛性よりも高められる。よって、第１導電板と第２導電板との間に配置された絶縁部材が確実に破れ、安全性を向上させることができる。 According to this power storage device, the second conductive plate is arranged inside the case, and the first conductive plate is arranged inside the second conductive plate. An insulating member is disposed between the second conductive plate and the first conductive plate. Here, since the rigidity of the first conductive plate is higher than the rigidity of the positive electrode or the negative electrode closest to the first conductive plate among the positive electrode and the negative electrode of the electrode assembly, the portion inside the first conductive plate, that is, the electrode assembly The three-dimensional object is not easily deformed by external force. Moreover, since the rigidity of the first conductive plate is higher than the rigidity of the second conductive plate, the second conductive plate is relatively easily deformed with respect to the force applied from the outside. Therefore, when the crushing occurs or the nail is pierced, the insulating member disposed between the first conductive plate and the second conductive plate is easily broken. Therefore, according to this power storage device, the insulating member can be reliably broken and the safety can be improved. Further, a plurality of short-circuit portions having a three-layer structure formed by two conductive plates connected to the positive electrode and the negative electrode, respectively, and an insulating member disposed therebetween are provided. Among the plurality of short-circuit portions, the rigidity of the first conductive plate of the short-circuit portion closest to the electrode assembly is higher than the rigidity of the other second conductive plate, third conductive plate, and fourth conductive plate. Therefore, the insulating member disposed between the first conductive plate and the second conductive plate is reliably broken, and the safety can be improved.

電極組立体の最も外側の層は負極であり、第１導電板が、負極と電気的に接続されており、第１導電板の剛性が、第１導電板に隣接する負極の剛性よりも高くてもよい。この場合、負極に接続された第１導電板の剛性が高められることにより、絶縁部材が確実に破れる。   The outermost layer of the electrode assembly is a negative electrode, the first conductive plate is electrically connected to the negative electrode, and the rigidity of the first conductive plate is higher than the rigidity of the negative electrode adjacent to the first conductive plate. May be. In this case, the insulating member is reliably broken by increasing the rigidity of the first conductive plate connected to the negative electrode.

第１導電板の厚みが、第２導電板の厚み、第３導電板の厚み、及び第４導電板の厚みのいずれよりも大きくてもよい。この場合、２枚の導電板と絶縁部材とによって形成される３層構造の短絡部が複数設けられる場合であっても、第１導電板の剛性を最も高くし易い。The thickness of the first conductive plate may be larger than any of the thickness of the second conductive plate, the thickness of the third conductive plate, and the thickness of the fourth conductive plate. In this case, even when a plurality of short-circuit portions having a three-layer structure formed by two conductive plates and an insulating member are provided, the rigidity of the first conductive plate is most easily increased.

第１導電板のヤング率が、第２導電板のヤング率、第３導電板のヤング率、及び第４導電板のヤング率のいずれよりも大きくてもよい。この場合、２枚の導電板と絶縁部材とによって形成される３層構造の短絡部が複数設けられる場合であっても、第１導電板の剛性を最も高くし易い。The Young's modulus of the first conductive plate may be larger than any of the Young's modulus of the second conductive plate, the Young's modulus of the third conductive plate, and the Young's modulus of the fourth conductive plate. In this case, even when a plurality of short-circuit portions having a three-layer structure formed by two conductive plates and an insulating member are provided, the rigidity of the first conductive plate is most easily increased.

本発明の蓄電装置は、ケースと、ケース内に収容された電極組立体と、ケースと電極組立体との間に配置された第１導電板と、ケースと第１導電板との間に配置された第２導電板と、第１導電板と第２導電板との間に配置された絶縁部材と、を備え、電極組立体は、正極と、負極と、正極と負極との間に配置されたセパレータと、を備え、第１導電板が、正極及び負極の一方と電気的に接続されており、第２導電板が、正極及び負極の他方と電気的に接続されており、第１導電板の剛性が、電極組立体の正極及び負極のうち第１導電板に最も近接する正極または負極の剛性よりも高く、かつ、第１導電板の剛性が第２導電板の剛性よりも高く、第１導電板はステンレス製である。A power storage device according to the present invention includes a case, an electrode assembly housed in the case, a first conductive plate disposed between the case and the electrode assembly, and a space between the case and the first conductive plate. And an insulating member disposed between the first conductive plate and the second conductive plate, and the electrode assembly is disposed between the positive electrode, the negative electrode, and the positive electrode and the negative electrode. The first conductive plate is electrically connected to one of the positive electrode and the negative electrode, the second conductive plate is electrically connected to the other of the positive electrode and the negative electrode, The rigidity of the conductive plate is higher than the rigidity of the positive or negative electrode closest to the first conductive plate among the positive and negative electrodes of the electrode assembly, and the rigidity of the first conductive plate is higher than the rigidity of the second conductive plate. The first conductive plate is made of stainless steel.

蓄電装置が二次電池であってもよい。この場合、二次電池において、圧潰または釘刺し時の安全性を向上させることができる。   The power storage device may be a secondary battery. In this case, in the secondary battery, safety at the time of crushing or nail penetration can be improved.

本発明によれば、絶縁部材が確実に破れるようにし、安全性を向上させることができる。   According to the present invention, it is possible to reliably break the insulating member and improve safety.

本発明の第１実施形態に係る蓄電装置を模式的に示す断面図である。It is sectional drawing which shows typically the electrical storage apparatus which concerns on 1st Embodiment of this invention. 図１のＩＩ−ＩＩ線に沿った断面図である。It is sectional drawing along the II-II line of FIG. 図１の蓄電装置において外力が加わった場合の短絡状態を示す断面図である。It is sectional drawing which shows a short circuit state when external force is added in the electrical storage apparatus of FIG. 第２実施形態に係る蓄電装置を示す断面図である。It is sectional drawing which shows the electrical storage apparatus which concerns on 2nd Embodiment. 第３実施形態に係る蓄電装置を示す断面図である。It is sectional drawing which shows the electrical storage apparatus which concerns on 3rd Embodiment.

以下、本発明の実施形態について、図面を参照しながら説明する。なお、図面の説明において同一要素には同一符号を付し、重複する説明は省略する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted.

図１は、本発明の第１実施形態に係る蓄電装置を模式的に示す断面図である。図２は、図１のＩＩ−ＩＩ線に沿った断面図である。図１及び図２に示される蓄電装置としての二次電池１００は、例えばリチウムイオン二次電池等の非水電解質二次電池である。   FIG. 1 is a cross-sectional view schematically showing the power storage device according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1 and 2 is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery.

二次電池１００は、ケース１０と、ケース１０内に収容された電極組立体２０とを備える。ケース１０は例えばアルミニウム等の金属からなってもよい。電極組立体２０は、正極３０と、負極４０と、正極３０と負極４０との間に配置されたセパレータ５０とを備える。正極３０、負極４０は、例えばシート状である。セパレータ５０は、例えばシート状であるが、袋状であってもよい。複数の正極３０及び複数の負極４０が、セパレータ５０を介して交互に積層されている。セパレータ５０が袋状である場合には、セパレータ５０内に、例えば正極３０が収容される。ケース１０内には電解液６０が充填され得る。電解液６０としては、例えば有機溶媒系又は非水系の電解液等が挙げられる。ケース１０の内壁面上には、絶縁フィルム１１が配置される。   The secondary battery 100 includes a case 10 and an electrode assembly 20 accommodated in the case 10. The case 10 may be made of a metal such as aluminum. The electrode assembly 20 includes a positive electrode 30, a negative electrode 40, and a separator 50 disposed between the positive electrode 30 and the negative electrode 40. The positive electrode 30 and the negative electrode 40 are, for example, in sheet form. The separator 50 is, for example, a sheet shape, but may be a bag shape. A plurality of positive electrodes 30 and a plurality of negative electrodes 40 are alternately stacked via separators 50. In the case where the separator 50 has a bag shape, for example, the positive electrode 30 is accommodated in the separator 50. The case 10 can be filled with the electrolytic solution 60. Examples of the electrolytic solution 60 include an organic solvent-based or non-aqueous electrolytic solution. An insulating film 11 is disposed on the inner wall surface of the case 10.

正極３０は、金属箔３０ｂと、金属箔３０ｂの両面に設けられた正極活物質層３０ｃとを備え得る。金属箔３０ｂは例えばアルミニウム箔である。正極活物質層３０ｃは、正極活物質とバインダとを含んでもよい。正極活物質としては、例えば複合酸化物、金属リチウム、硫黄等が挙げられる。複合酸化物は、マンガン、ニッケル、コバルト及びアルミニウムの少なくとも１つとリチウムとを含む。   The positive electrode 30 can include a metal foil 30b and a positive electrode active material layer 30c provided on both surfaces of the metal foil 30b. The metal foil 30b is, for example, an aluminum foil. The positive electrode active material layer 30c may include a positive electrode active material and a binder. Examples of the positive electrode active material include composite oxide, metallic lithium, and sulfur. The composite oxide includes at least one of manganese, nickel, cobalt, and aluminum and lithium.

正極３０は、縁に形成されたタブ３０ａを有してもよい。タブ３０ａには、正極活物質が担持されていない。正極３０は、タブ３０ａを介して導電部材３２に接続され得る。導電部材３２は、正極端子３４に接続され得る。正極端子３４は、絶縁リング３６を介してケース１０に取り付けられてもよい。   The positive electrode 30 may have a tab 30a formed at the edge. The tab 30a does not carry a positive electrode active material. The positive electrode 30 can be connected to the conductive member 32 via the tab 30a. The conductive member 32 can be connected to the positive terminal 34. The positive electrode terminal 34 may be attached to the case 10 via an insulating ring 36.

負極４０は、金属箔４０ｂと、金属箔４０ｂの両面に設けられた負極活物質層４０ｃとを備え得る。金属箔４０ｂは例えば銅箔である。負極活物質層４０ｃは、負極活物質とバインダとを含んでもよい。負極活物質としては、例えば黒鉛、高配向性グラファイト、メソカーボンマイクロビーズ、ハードカーボン、ソフトカーボン等のカーボン、リチウム、ナトリウム等のアルカリ金属、金属化合物、ＳｉＯｘ（０．５≦ｘ≦１．５）等の金属酸化物、ホウ素添加炭素等が挙げられる。   The negative electrode 40 can include a metal foil 40b and a negative electrode active material layer 40c provided on both surfaces of the metal foil 40b. The metal foil 40b is, for example, a copper foil. The negative electrode active material layer 40c may include a negative electrode active material and a binder. Examples of the negative electrode active material include carbon such as graphite, highly oriented graphite, mesocarbon microbeads, hard carbon, and soft carbon, alkali metals such as lithium and sodium, metal compounds, SiOx (0.5 ≦ x ≦ 1.5 ) And the like, and boron-added carbon.

負極４０は、縁に形成されたタブ４０ａを有してもよい。タブ４０ａには、負極活物質が担持されていない。負極４０は、タブ４０ａを介して導電部材４２に接続され得る。導電部材４２は、負極端子４４に接続され得る。負極端子４４は、絶縁リング４６を介してケース１０に取り付けられてもよい。   The negative electrode 40 may have a tab 40a formed at the edge. The tab 40a does not carry a negative electrode active material. The negative electrode 40 can be connected to the conductive member 42 via the tab 40a. The conductive member 42 can be connected to the negative terminal 44. The negative electrode terminal 44 may be attached to the case 10 via the insulating ring 46.

セパレータ５０としては、ポリエチレン（ＰＥ）、ポリプロピレン（ＰＰ）等のポリオレフィン系樹脂からなる多孔質フィルム、ポリプロピレン、ポリエチレンテレフタレート（ＰＥＴ）、メチルセルロース等からなる織布又は不織布等が例示される。   Examples of the separator 50 include a porous film made of a polyolefin resin such as polyethylene (PE) and polypropylene (PP), a woven fabric or a non-woven fabric made of polypropylene, polyethylene terephthalate (PET), methylcellulose, and the like.

ケース１０と電極組立体２０との間には、第１導電板１４が配置される。第１導電板１４は、例えば単一の板状部材からなるが、積層された複数の金属箔からなってもよい。第１導電板１４には、活物質層が設けられていない。第１導電板１４は、安全対策用の未塗工電極である。   The first conductive plate 14 is disposed between the case 10 and the electrode assembly 20. The first conductive plate 14 is made of, for example, a single plate-like member, but may be made of a plurality of laminated metal foils. The first conductive plate 14 is not provided with an active material layer. The first conductive plate 14 is an uncoated electrode for safety measures.

ケース１０と第１導電板１４との間には、第２導電板１６が配置される。第２導電板１６は、例えば単一の板状部材からなるが、積層された複数の金属箔からなってもよい。第２導電板１６には、活物質層が設けられていない。第２導電板１６は、安全対策用の未塗工電極である。   A second conductive plate 16 is disposed between the case 10 and the first conductive plate 14. The second conductive plate 16 is made of, for example, a single plate-like member, but may be made of a plurality of laminated metal foils. The second conductive plate 16 is not provided with an active material layer. The second conductive plate 16 is an uncoated electrode for safety measures.

第１導電板１４と第２導電板１６との間には、絶縁部材１８が配置される。絶縁部材１８は、絶縁シート又は絶縁層であってもよい。絶縁部材１８としては、例えば樹脂シート、樹脂層、又はセパレータ５０が用いられてもよい。   An insulating member 18 is disposed between the first conductive plate 14 and the second conductive plate 16. The insulating member 18 may be an insulating sheet or an insulating layer. As the insulating member 18, for example, a resin sheet, a resin layer, or a separator 50 may be used.

第１導電板１４は、正極３０及び負極４０の一方と電気的に接続される。第２導電板１６は、正極３０及び負極４０の他方と電気的に接続される。二次電池１００では、第１導電板１４が、電極組立体２０における最も外側の層を構成する負極４０と電気的に接続され、第２導電板１６が正極３０と電気的に接続される。この場合、例えば、第１導電板１４は銅からなり、第２導電板１６はアルミニウムからなる。   The first conductive plate 14 is electrically connected to one of the positive electrode 30 and the negative electrode 40. The second conductive plate 16 is electrically connected to the other of the positive electrode 30 and the negative electrode 40. In the secondary battery 100, the first conductive plate 14 is electrically connected to the negative electrode 40 constituting the outermost layer in the electrode assembly 20, and the second conductive plate 16 is electrically connected to the positive electrode 30. In this case, for example, the first conductive plate 14 is made of copper, and the second conductive plate 16 is made of aluminum.

第１導電板１４は、縁に形成されたタブ１４ｄを有してもよい。タブ１４ｄは、負極４０のタブ４０ａに接続され得る。タブ１４ｄの厚みは、第１導電板１４における他の部分の厚みに比べて薄くてもよい。タブ１４ｄはタブ４０ａと重なるように配置され得る。第２導電板１６は、縁に形成されたタブ１６ｄを有してもよい。タブ１６ｄは、正極３０のタブ３０ａに接続され得る。タブ１６ｄの厚みは、第２導電板１６における他の部分の厚みに比べて薄くてもよい。タブ１６ｄはタブ３０ａと重なるように配置され得る。   The first conductive plate 14 may have a tab 14d formed on the edge. The tab 14 d can be connected to the tab 40 a of the negative electrode 40. The thickness of the tab 14d may be smaller than the thickness of other portions of the first conductive plate 14. The tab 14d can be arranged to overlap the tab 40a. The second conductive plate 16 may have a tab 16d formed on the edge. The tab 16 d can be connected to the tab 30 a of the positive electrode 30. The thickness of the tab 16d may be smaller than the thickness of other portions of the second conductive plate 16. The tab 16d can be arranged to overlap the tab 30a.

上述したとおり、ケース１０内には、ケース１０の内方に向かうにしたがって、第２導電板１６、絶縁部材１８、第１導電板１４、及び電極組立体２０が、この順に積層されている。第１導電板１４には、電極組立体２０のうち最外層に配置された負極４０が隣接している。第２導電板１６、絶縁部材１８、及び第１導電板１４は、電極組立体２０の積層方向における他方の端部（不図示）においても、同様に設けられる。一方に配置された第２導電板１６、絶縁部材１８、及び第１導電板１４と、他方に配置された第２導電板１６、絶縁部材１８、及び第１導電板１４とは、電極組立体２０の積層方向に垂直な面に関して面対称をなしている。なお、第２導電板１６、絶縁部材１８、及び第１導電板１４は、電極組立体２０の積層方向における一方のみに設けられてもよい。   As described above, in the case 10, the second conductive plate 16, the insulating member 18, the first conductive plate 14, and the electrode assembly 20 are stacked in this order toward the inside of the case 10. The first conductive plate 14 is adjacent to the negative electrode 40 disposed in the outermost layer of the electrode assembly 20. The second conductive plate 16, the insulating member 18, and the first conductive plate 14 are similarly provided at the other end (not shown) in the stacking direction of the electrode assembly 20. The second conductive plate 16, the insulating member 18, and the first conductive plate 14 disposed on one side, and the second conductive plate 16, the insulating member 18, and the first conductive plate 14 disposed on the other side are an electrode assembly. The plane is symmetrical with respect to a plane perpendicular to the stacking direction. Note that the second conductive plate 16, the insulating member 18, and the first conductive plate 14 may be provided only on one side in the stacking direction of the electrode assembly 20.

電極組立体２０では、ケース１０の内方に向けて、負極４０、セパレータ５０、及び正極３０がこの順に配置されるが、正極３０、セパレータ５０、及び負極４０がこの順に配置されてもよい。電極組立体２０の最外層に正極３０が配置される場合、正極３０と第１導電板１４との間には絶縁部材１８またはセパレータ５０が配置される。   In the electrode assembly 20, the negative electrode 40, the separator 50, and the positive electrode 30 are arranged in this order toward the inside of the case 10, but the positive electrode 30, the separator 50, and the negative electrode 40 may be arranged in this order. When the positive electrode 30 is disposed on the outermost layer of the electrode assembly 20, the insulating member 18 or the separator 50 is disposed between the positive electrode 30 and the first conductive plate 14.

また、第１導電板１４が正極３０と電気的に接続され、第２導電板１６が負極４０と電気的に接続されてもよい。この場合、例えば、第１導電板１４はアルミニウムからなり、第２導電板１６は銅からなる。電極組立体２０の最外層に正極３０が配置される場合、第１導電板１４には正極３０が隣接する。電極組立体２０の最外層に負極４０が配置される場合、負極４０と第１導電板１４との間には絶縁部材１８またはセパレータ５０が配置される。   Further, the first conductive plate 14 may be electrically connected to the positive electrode 30, and the second conductive plate 16 may be electrically connected to the negative electrode 40. In this case, for example, the first conductive plate 14 is made of aluminum, and the second conductive plate 16 is made of copper. When the positive electrode 30 is disposed on the outermost layer of the electrode assembly 20, the positive electrode 30 is adjacent to the first conductive plate 14. When the negative electrode 40 is disposed on the outermost layer of the electrode assembly 20, the insulating member 18 or the separator 50 is disposed between the negative electrode 40 and the first conductive plate 14.

二次電池１００では、第１導電板１４の剛性が、電極組立体２０に隣接する負極４０の剛性よりも高い。すなわち、第１導電板１４の剛性が、電極組立体２０の正極３０及び負極４０のうち第１導電板１４に最も近接する正極３０または負極４０（二次電池１００の場合、負極４０）の剛性よりも高い。さらに、第１導電板１４の剛性が、第２導電板１６の剛性よりも高い。   In the secondary battery 100, the rigidity of the first conductive plate 14 is higher than the rigidity of the negative electrode 40 adjacent to the electrode assembly 20. That is, the rigidity of the first conductive plate 14 is the rigidity of the positive electrode 30 or the negative electrode 40 (the negative electrode 40 in the case of the secondary battery 100) closest to the first conductive plate 14 among the positive electrode 30 and the negative electrode 40 of the electrode assembly 20. Higher than. Further, the rigidity of the first conductive plate 14 is higher than the rigidity of the second conductive plate 16.

第１導電板１４の厚みは、負極４０の金属箔４０ｂの厚みよりも大きくてもよい。第１導電板１４の厚みは、負極活物質層４０ｃ，４０ｃを含む負極４０の厚みよりも大きくてもよい。第１導電板１４の厚みは、第２導電板１６の厚みよりも大きくてもよい。第２導電板１６の厚みは、正極３０の金属箔３０ｂの厚みよりも大きくてもよい。第２導電板１６の厚みは、正極活物質層３０ｃ，３０ｃを含む正極３０の厚みよりも大きくてもよい。   The thickness of the first conductive plate 14 may be larger than the thickness of the metal foil 40 b of the negative electrode 40. The thickness of the first conductive plate 14 may be larger than the thickness of the negative electrode 40 including the negative electrode active material layers 40c and 40c. The thickness of the first conductive plate 14 may be larger than the thickness of the second conductive plate 16. The thickness of the second conductive plate 16 may be larger than the thickness of the metal foil 30b of the positive electrode 30. The thickness of the second conductive plate 16 may be larger than the thickness of the positive electrode 30 including the positive electrode active material layers 30c and 30c.

第１導電板１４のヤング率は、負極４０の金属箔４０ｂのヤング率よりも大きくてもよい。第１導電板１４のヤング率は、第２導電板１６のヤング率よりも大きくてもよい。   The Young's modulus of the first conductive plate 14 may be larger than the Young's modulus of the metal foil 40b of the negative electrode 40. The Young's modulus of the first conductive plate 14 may be larger than the Young's modulus of the second conductive plate 16.

ここで、「剛性」は、同じ曲げ応力が加えられたときの曲がり具合（変形の度合い）によって決まる。例えば、剛性が高いということは、ある曲げ応力が加えられたときの曲がり具合が小さいことを意味する。言い換えれば、同じ材質からなり、同じ断面積を有する板材においては、大きい厚みを有する板材ほど、高い剛性を有する。材質が同じである場合、剛性は厚みに比例する。   Here, “rigidity” is determined by the degree of bending (degree of deformation) when the same bending stress is applied. For example, high rigidity means that the degree of bending when a certain bending stress is applied is small. In other words, in a plate material made of the same material and having the same cross-sectional area, a plate material having a larger thickness has higher rigidity. If the material is the same, the stiffness is proportional to the thickness.

以上説明した構成を有する二次電池１００によれば、ケース１０の内側に第２導電板１６が配置され、第２導電板１６の内側に第１導電板１４が配置される。第２導電板１６と第１導電板１４との間には絶縁部材１８が配置される。ここで、第１導電板１４の剛性が、電極組立体２０の正極３０及び負極４０のうち第１導電板１４に最も近接する正極３０または負極４０（二次電池１００の場合、負極４０）の剛性よりも高いため、第１導電板１４よりも内側の部分すなわち電極組立体２０は、外部から加わる力に対して変形しにくい。また、第１導電板１４の剛性が第２導電板１６の剛性よりも高いため、第２導電板１６は、外部から加わる力に対して比較的変形しやすい。よって、図３に示されるように、押圧部材１１０によって二次電池１００が押圧され、圧潰が生じたとき（又は釘が刺さったとき）、第１導電板１４と第２導電板１６との間に配置された絶縁部材１８が破れやすい。言い換えれば、絶縁部材１８に迅速に孔が形成される。したがって、二次電池１００によれば、絶縁部材１８が確実かつ迅速に破れ、第１導電板１４と第２導電板１６との間に短絡電流が流れるため、安全性を向上させることができる。また、高い剛性を有する第１導電板１４によって、電極組立体２０における短絡を遅らせることができる。つまり、第１導電板１４と第２導電板１６との間の短絡が開始してから、電極組立体２０における短絡が開始するまでの時間が長くなる。   According to the secondary battery 100 having the configuration described above, the second conductive plate 16 is disposed inside the case 10, and the first conductive plate 14 is disposed inside the second conductive plate 16. An insulating member 18 is disposed between the second conductive plate 16 and the first conductive plate 14. Here, the rigidity of the first conductive plate 14 is that of the positive electrode 30 or the negative electrode 40 (the negative electrode 40 in the case of the secondary battery 100) closest to the first conductive plate 14 among the positive electrode 30 and the negative electrode 40 of the electrode assembly 20. Since it is higher than the rigidity, the portion inside the first conductive plate 14, that is, the electrode assembly 20 is not easily deformed by a force applied from the outside. Moreover, since the rigidity of the first conductive plate 14 is higher than the rigidity of the second conductive plate 16, the second conductive plate 16 is relatively easily deformed with respect to the force applied from the outside. Therefore, as shown in FIG. 3, when the secondary battery 100 is pressed by the pressing member 110 and crushing occurs (or when a nail is pierced), the gap between the first conductive plate 14 and the second conductive plate 16. The insulating member 18 disposed in the is easily broken. In other words, a hole is quickly formed in the insulating member 18. Therefore, according to the secondary battery 100, the insulating member 18 is reliably and quickly broken, and a short-circuit current flows between the first conductive plate 14 and the second conductive plate 16, so that safety can be improved. Moreover, the short circuit in the electrode assembly 20 can be delayed by the first conductive plate 14 having high rigidity. That is, the time from the start of the short circuit between the first conductive plate 14 and the second conductive plate 16 to the start of the short circuit in the electrode assembly 20 becomes longer.

このように、二次電池１００では、高い剛性を有する第１導電板１４が設けられたことにより、セルが二重構造を有する。二重構造の外側は、二重構造の内側よりも変形し易い。二重構造の内側は、変形し難い。これにより、変形し易い外側の絶縁部材１８が先に破れる。   Thus, in the secondary battery 100, the cell has a double structure by providing the first conductive plate 14 having high rigidity. The outside of the double structure is more easily deformed than the inside of the double structure. The inside of the double structure is difficult to deform. Thereby, the outer insulating member 18 which is easily deformed is torn first.

また、電極組立体２０における最も外側の層は負極４０であり、負極４０は第１導電板１４に隣接する。負極４０に接続された第１導電板１４の剛性が高められることにより、絶縁部材１８が確実に破れ、電極組立体２０における短絡を遅らせることができる。   The outermost layer in the electrode assembly 20 is the negative electrode 40, and the negative electrode 40 is adjacent to the first conductive plate 14. By increasing the rigidity of the first conductive plate 14 connected to the negative electrode 40, the insulating member 18 can be reliably broken, and the short circuit in the electrode assembly 20 can be delayed.

また、第１導電板１４の厚みが第２導電板１６の厚みよりも大きいため、第１導電板１４の剛性を高くし易い。   Further, since the thickness of the first conductive plate 14 is larger than the thickness of the second conductive plate 16, it is easy to increase the rigidity of the first conductive plate 14.

また、ヤング率が大きい物質ほど、高い剛性を有する。第１導電板１４のヤング率が第２導電板１６のヤング率よりも大きいため、第１導電板１４の剛性を高くし易い。   In addition, the higher the Young's modulus, the higher the rigidity. Since the Young's modulus of the first conductive plate 14 is larger than the Young's modulus of the second conductive plate 16, the rigidity of the first conductive plate 14 can be easily increased.

上述したように、二次電池１００において、圧潰または釘刺し時の安全性が向上されている。   As described above, in the secondary battery 100, the safety at the time of crushing or nail penetration is improved.

図４を参照して、第２実施形態に係る二次電池１００Ａについて説明する。図４に示される二次電池１００Ａが図２に示される第１実施形態の二次電池１００と違う点は、正極３０及び負極４０にそれぞれ接続された２枚の導電板と、その間に配置された絶縁部材１８とによって形成される３層構造の短絡部が、２層設けられた点である。   A secondary battery 100A according to the second embodiment will be described with reference to FIG. The secondary battery 100A shown in FIG. 4 is different from the secondary battery 100 of the first embodiment shown in FIG. 2 in that two conductive plates connected to the positive electrode 30 and the negative electrode 40, respectively, are arranged between them. The short-circuit portion having a three-layer structure formed by the insulating member 18 is provided in two layers.

図４に示されるように、ケース１０と電極組立体２０との間には、第１短絡部７１が形成されている。ケース１０と第１短絡部７１との間には、第２短絡部７２が形成されている。第１短絡部７１と第２短絡部７２との間には、絶縁部材１８又はセパレータ５０と同じ材料からなる絶縁部材７３が配置されている。   As shown in FIG. 4, a first short circuit portion 71 is formed between the case 10 and the electrode assembly 20. A second short circuit portion 72 is formed between the case 10 and the first short circuit portion 71. An insulating member 73 made of the same material as that of the insulating member 18 or the separator 50 is disposed between the first short circuit portion 71 and the second short circuit portion 72.

第１短絡部７１は、ケース１０と電極組立体２０との間に配置された第１導電板１４Ａと、ケース１０と第１導電板１４Ａとの間に配置された第２導電板１６Ａと、第１導電板１４Ａと第２導電板１６Ａとの間に配置された絶縁部材１８Ａとを備える。第２短絡部７２は、ケース１０と第２導電板１６Ａとの間に配置された第３導電板２４と、ケース１０と第３導電板２４との間に配置された第４導電板２６と、第３導電板２４と第４導電板２６との間に配置された絶縁部材（第２絶縁部材）２８とを備える。   The first short-circuit portion 71 includes a first conductive plate 14A disposed between the case 10 and the electrode assembly 20, a second conductive plate 16A disposed between the case 10 and the first conductive plate 14A, An insulating member 18A is provided between the first conductive plate 14A and the second conductive plate 16A. The second short circuit part 72 includes a third conductive plate 24 disposed between the case 10 and the second conductive plate 16A, and a fourth conductive plate 26 disposed between the case 10 and the third conductive plate 24. And an insulating member (second insulating member) 28 disposed between the third conductive plate 24 and the fourth conductive plate 26.

第１導電板１４Ａ、第２導電板１６Ａ、及び絶縁部材１８Ａは、それぞれ、第１導電板１４、第２導電板１６、及び絶縁部材１８と同じ材料からなる。第３導電板２４、第４導電板２６、及び絶縁部材２８は、それぞれ、第１導電板１４、第２導電板１６、及び絶縁部材１８と同じ材料からなる。   The first conductive plate 14A, the second conductive plate 16A, and the insulating member 18A are made of the same material as the first conductive plate 14, the second conductive plate 16, and the insulating member 18, respectively. The third conductive plate 24, the fourth conductive plate 26, and the insulating member 28 are made of the same material as the first conductive plate 14, the second conductive plate 16, and the insulating member 18, respectively.

第１導電板１４Ａは、正極３０及び負極４０の一方と電気的に接続される。第２導電板１６Ａは、正極３０及び負極４０の他方と電気的に接続される。二次電池１００Ａでは、第１導電板１４Ａが負極４０と電気的に接続され、第２導電板１６Ａが正極３０と電気的に接続される。第３導電板２４は、正極３０及び負極４０の一方と電気的に接続される。第４導電板２６は、正極３０及び負極４０の他方と電気的に接続される。二次電池１００Ａでは、第３導電板２４が負極４０と電気的に接続され、第４導電板２６が正極３０と電気的に接続される。   The first conductive plate 14 </ b> A is electrically connected to one of the positive electrode 30 and the negative electrode 40. The second conductive plate 16A is electrically connected to the other of the positive electrode 30 and the negative electrode 40. In the secondary battery 100A, the first conductive plate 14A is electrically connected to the negative electrode 40, and the second conductive plate 16A is electrically connected to the positive electrode 30. The third conductive plate 24 is electrically connected to one of the positive electrode 30 and the negative electrode 40. The fourth conductive plate 26 is electrically connected to the other of the positive electrode 30 and the negative electrode 40. In the secondary battery 100 </ b> A, the third conductive plate 24 is electrically connected to the negative electrode 40, and the fourth conductive plate 26 is electrically connected to the positive electrode 30.

二次電池１００Ａでは、第１導電板１４Ａの剛性が、電極組立体２０に隣接する負極４０の剛性よりも高い。すなわち、第１導電板１４Ａの剛性が、電極組立体２０の正極３０及び負極４０のうち第１導電板１４に最も近接する正極３０または負極４０（二次電池１００Ａの場合、負極４０）の剛性よりも高い。さらに、第１導電板１４Ａの剛性が、第２導電板１６Ａの剛性よりも高い。第１導電板１４Ａの剛性が、第２導電板１６Ａの剛性、第３導電板２４の剛性、及び第４導電板２６の剛性のいずれよりも高い。   In the secondary battery 100 </ b> A, the rigidity of the first conductive plate 14 </ b> A is higher than the rigidity of the negative electrode 40 adjacent to the electrode assembly 20. That is, the rigidity of the first conductive plate 14A is the rigidity of the positive electrode 30 or the negative electrode 40 (the negative electrode 40 in the case of the secondary battery 100A) closest to the first conductive plate 14 among the positive electrode 30 and the negative electrode 40 of the electrode assembly 20. Higher than. Furthermore, the rigidity of the first conductive plate 14A is higher than the rigidity of the second conductive plate 16A. The rigidity of the first conductive plate 14A is higher than any of the rigidity of the second conductive plate 16A, the rigidity of the third conductive plate 24, and the rigidity of the fourth conductive plate 26.

第１導電板１４Ａの厚みは、第２導電板１６Ａの厚みよりも大きくてもよい。第１導電板１４Ａの厚みが、第２導電板１６Ａの厚み、第３導電板２４の厚み、及び第４導電板２６の厚みのいずれよりも大きくてもよい。第１導電板１４Ａのヤング率は、第２導電板１６Ａのヤング率よりも大きくてもよい。第１導電板１４Ａのヤング率が、第２導電板１６Ａのヤング率、第３導電板２４のヤング率、及び第４導電板２６のヤング率のいずれよりも大きくてもよい。   The thickness of the first conductive plate 14A may be larger than the thickness of the second conductive plate 16A. The thickness of the first conductive plate 14A may be greater than any of the thickness of the second conductive plate 16A, the thickness of the third conductive plate 24, and the thickness of the fourth conductive plate 26. The Young's modulus of the first conductive plate 14A may be larger than the Young's modulus of the second conductive plate 16A. The Young's modulus of the first conductive plate 14A may be greater than any of the Young's modulus of the second conductive plate 16A, the Young's modulus of the third conductive plate 24, and the Young's modulus of the fourth conductive plate 26.

二次電池１００Ａによれば、二次電池１００と同様の作用効果が奏される。すなわち、絶縁部材１８Ａが確実かつ迅速に破れ、安全性を向上させることができる。また、高い剛性を有する第１導電板１４Ａによって、電極組立体２０における短絡を遅らせることができる。   According to the secondary battery 100A, the same effects as the secondary battery 100 are exhibited. That is, the insulating member 18A can be reliably and quickly broken, and the safety can be improved. Moreover, the short circuit in the electrode assembly 20 can be delayed by the first conductive plate 14A having high rigidity.

複数の短絡部７１，７２のうち、電極組立体２０に最も近接する第１短絡部７１の第１導電板１４Ａの剛性が、他の第２導電板１６Ａ、第３導電板２４、第４導電板２６の剛性よりも高められる。よって、第１導電板１４Ａと第２導電板１６Ａとの間に配置された第２導電板１６Ａが確実に破れ、安全性を向上させることができる。 Among the plurality of short-circuit portions 71 and 72 , the rigidity of the first conductive plate 14A of the first short-circuit portion 71 closest to the electrode assembly 20 is the same as that of the other second conductive plate 16A, the third conductive plate 24, and the fourth conductive state. The rigidity of the plate 26 is increased. Accordingly, the second conductive plate 16A disposed between the first conductive plate 14A and the second conductive plate 16A can be reliably broken, and safety can be improved.

また、第１導電板１４Ａの厚みが、第２導電板１６Ａの厚み、第３導電板２４の厚み、及び第４導電板２６の厚みのいずれよりも大きいため、２層の短絡部７１，７２が設けられる場合であっても、第１導電板１４Ａの剛性を最も高くし易い。 Further, since the thickness of the first conductive plate 14A is larger than any of the thickness of the second conductive plate 16A, the thickness of the third conductive plate 24, and the thickness of the fourth conductive plate 26, the two-layer short-circuit portions 71 and 72 are formed. Is provided, the rigidity of the first conductive plate 14A is most easily increased.

また、第１導電板１４Ａのヤング率が、第２導電板１６Ａのヤング率、第３導電板２４のヤング率、及び第４導電板２６のヤング率のいずれよりも大きいため、２層の短絡部７１，７２が設けられる場合であっても、第１導電板１４Ａの剛性を最も高くし易い。 In addition, since the Young's modulus of the first conductive plate 14A is larger than any of the Young's modulus of the second conductive plate 16A, the third conductive plate 24, and the Young's modulus of the fourth conductive plate 26, two layers are short-circuited. Even in the case where the portions 71 and 72 are provided, the rigidity of the first conductive plate 14A is most easily increased.

図５を参照して、第３実施形態に係る二次電池１００Ｂについて説明する。図５に示される二次電池１００Ｂが図４に示される第１実施形態の二次電池１００Ａと違う点は、第１導電板１４Ａを有する第１短絡部７１に代えて、ステンレス製の第１導電板１４Ｂを有する第１短絡部７１Ｂを備えた点である。   A secondary battery 100B according to the third embodiment will be described with reference to FIG. The secondary battery 100B shown in FIG. 5 is different from the secondary battery 100A of the first embodiment shown in FIG. 4 in that instead of the first short-circuit portion 71 having the first conductive plate 14A, a stainless steel first This is a point provided with a first short-circuit portion 71B having a conductive plate 14B.

二次電池１００Ｂでは、第１導電板１４Ｂの剛性が、電極組立体２０に隣接する負極４０の剛性よりも高い。すなわち、第１導電板１４Ｂの剛性が、電極組立体２０の正極３０及び負極４０のうち第１導電板１４に最も近接する正極３０または負極４０（二次電池１００Ｂの場合、負極４０）の剛性よりも高い。さらに、第１導電板１４Ｂの剛性が、第２導電板１６Ａの剛性よりも高い。第１導電板１４Ｂの剛性が、第２導電板１６Ａの剛性、第３導電板２４の剛性、及び第４導電板２６の剛性のいずれよりも高い。   In the secondary battery 100 </ b> B, the rigidity of the first conductive plate 14 </ b> B is higher than the rigidity of the negative electrode 40 adjacent to the electrode assembly 20. That is, the rigidity of the first conductive plate 14B is the rigidity of the positive electrode 30 or the negative electrode 40 (the negative electrode 40 in the case of the secondary battery 100B) that is closest to the first conductive plate 14 among the positive electrode 30 and the negative electrode 40 of the electrode assembly 20. Higher than. Furthermore, the rigidity of the first conductive plate 14B is higher than the rigidity of the second conductive plate 16A. The rigidity of the first conductive plate 14B is higher than any of the rigidity of the second conductive plate 16A, the rigidity of the third conductive plate 24, and the rigidity of the fourth conductive plate 26.

第１導電板１４Ｂの厚みは、第２導電板１６Ａの厚みよりも大きくてもよい。第１導電板１４Ｂの厚みが、第２導電板１６Ａの厚み、第３導電板２４の厚み、及び第４導電板２６の厚みのいずれよりも大きくてもよい。第１導電板１４Ｂの厚みが、第２導電板１６Ａの厚み、第３導電板２４の厚み、及び第４導電板２６の厚みと同じ又はそれらの厚みより小さくてもよい。第１導電板１４Ｂのヤング率は、第２導電板１６Ａのヤング率よりも大きくてもよい。第１導電板１４Ｂのヤング率が、第２導電板１６Ａのヤング率、第３導電板２４のヤング率、及び第４導電板２６のヤング率のいずれよりも大きくてもよい。   The thickness of the first conductive plate 14B may be larger than the thickness of the second conductive plate 16A. The thickness of the first conductive plate 14B may be greater than any of the thickness of the second conductive plate 16A, the thickness of the third conductive plate 24, and the thickness of the fourth conductive plate 26. The thickness of the first conductive plate 14B may be the same as or smaller than the thickness of the second conductive plate 16A, the thickness of the third conductive plate 24, and the thickness of the fourth conductive plate 26. The Young's modulus of the first conductive plate 14B may be larger than the Young's modulus of the second conductive plate 16A. The Young's modulus of the first conductive plate 14B may be larger than any of the Young's modulus of the second conductive plate 16A, the Young's modulus of the third conductive plate 24, and the Young's modulus of the fourth conductive plate 26.

二次電池１００Ｂによれば、二次電池１００，１００Ａと同様の作用効果が奏される。すなわち、絶縁部材１８Ａが確実かつ迅速に破れ、安全性を向上させることができる。また、高い剛性を有する第１導電板１４Ｂによって、電極組立体２０における短絡を遅らせることができる。   According to the secondary battery 100B, the same effects as the secondary batteries 100 and 100A are exhibited. That is, the insulating member 18A can be reliably and quickly broken, and the safety can be improved. Moreover, the short circuit in the electrode assembly 20 can be delayed by the first conductive plate 14B having high rigidity.

第２導電板１６Ａ、第３導電板２４、第４導電板２６としては、電極３０，４０に用いられる金属箔３０ｂ，４０ｂと同じ材質が用いられる。ステンレスは、電極３０，４０に用いられる金属箔３０ｂ，４０ｂよりもヤング率が高く、よって高い剛性を有する。第１導電板１４Ｂがステンレス製であることにより、第１導電板１４Ｂよりも外側（ケース１０側）の部分は変形しやすい。したがって、絶縁部材１８Ａをより確実に破ることができる。   As the second conductive plate 16A, the third conductive plate 24, and the fourth conductive plate 26, the same material as the metal foils 30b and 40b used for the electrodes 30 and 40 is used. Stainless steel has a higher Young's modulus than the metal foils 30b and 40b used for the electrodes 30 and 40, and thus has high rigidity. Since the first conductive plate 14B is made of stainless steel, the portion on the outer side (case 10 side) than the first conductive plate 14B is easily deformed. Therefore, the insulating member 18A can be broken more reliably.

以上、本発明の実施形態について説明したが、本発明は上記実施形態に限られるものではない。例えば、積層型の電極組立体２０に代えて巻回型の電極組立体が用いられてもよい。巻回型の電極組立体は、帯状の正極３０、負極４０及びセパレータ５０を軸線の周りに巻回することによって作製される。
また、電極組立体２０は、最外層を構成する電極の外側に、絶縁フィルムが配置されてもよい。 As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. For example, a wound electrode assembly may be used in place of the stacked electrode assembly 20. The wound electrode assembly is manufactured by winding a belt-like positive electrode 30, a negative electrode 40, and a separator 50 around an axis.
In the electrode assembly 20, an insulating film may be disposed outside the electrode constituting the outermost layer.

蓄電装置として、二次電池１００の他に、例えば電気二重層キャパシタ等が挙げられる。   As the power storage device, in addition to the secondary battery 100, for example, an electric double layer capacitor or the like can be given.

例えば二次電池１００等の蓄電装置は、車両に搭載されてもよい。車両としては、例えば、電気自動車、ハイブリッド自動車、プラグインハイブリッド自動車、ハイブリッド鉄道車両、電気車椅子、電動アシスト自転車、電動二輪車等が挙げられる。   For example, a power storage device such as the secondary battery 100 may be mounted on the vehicle. Examples of the vehicle include an electric vehicle, a hybrid vehicle, a plug-in hybrid vehicle, a hybrid railway vehicle, an electric wheelchair, an electrically assisted bicycle, and an electric motorcycle.

１０…ケース、１４，１４Ａ，１４Ｂ…第１導電板、１６，１６Ａ…第２導電板、１８，１８Ａ…絶縁部材、２０…電極組立体、２４…第３導電板、２６…第４導電板、２８…絶縁部材（第２絶縁部材）、３０…正極、４０…負極、５０…セパレータ、１００，１００Ａ，１００Ｂ…二次電池。   DESCRIPTION OF SYMBOLS 10 ... Case, 14, 14A, 14B ... 1st electrically conductive plate, 16, 16A ... 2nd electrically conductive plate, 18, 18A ... Insulation member, 20 ... Electrode assembly, 24 ... 3rd electrically conductive plate, 26 ... 4th electrically conductive plate 28 ... Insulating member (second insulating member), 30 ... Positive electrode, 40 ... Negative electrode, 50 ... Separator, 100, 100A, 100B ... Secondary battery.

Claims (6)

ケースと、
前記ケース内に収容された電極組立体と、
前記ケースと前記電極組立体との間に配置された第１導電板と、
前記ケースと前記第１導電板との間に配置された第２導電板と、
前記第１導電板と前記第２導電板との間に配置された絶縁部材と、を備え、
前記電極組立体は、正極と、負極と、前記正極と前記負極との間に配置されたセパレータと、を備え、
前記第１導電板が、前記正極及び前記負極の一方と電気的に接続されており、
前記第２導電板が、前記正極及び前記負極の他方と電気的に接続されており、
前記第１導電板の剛性が、前記電極組立体の前記正極及び前記負極のうち前記第１導電板に最も近接する前記正極または前記負極の剛性よりも高く、かつ、前記第１導電板の剛性が前記第２導電板の剛性よりも高く、
前記ケースと前記第２導電板との間に配置された第３導電板と、
前記ケースと前記第３導電板との間に配置された第４導電板と、
前記第３導電板と前記第４導電板との間に配置された第２絶縁部材と、を更に備え、
前記第３導電板が、前記正極及び前記負極の一方と電気的に接続されており、
前記第４導電板が、前記正極及び前記負極の他方と電気的に接続されており、
前記第１導電板の剛性が、前記第２導電板の剛性、前記第３導電板の剛性、及び前記第４導電板の剛性のいずれよりも高い、蓄電装置。 Case and
An electrode assembly housed in the case;
A first conductive plate disposed between the case and the electrode assembly;
A second conductive plate disposed between the case and the first conductive plate;
An insulating member disposed between the first conductive plate and the second conductive plate,
The electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode,
The first conductive plate is electrically connected to one of the positive electrode and the negative electrode;
The second conductive plate is electrically connected to the other of the positive electrode and the negative electrode;
The rigidity of the first conductive plate is higher than the rigidity of the positive electrode or the negative electrode closest to the first conductive plate among the positive electrode and the negative electrode of the electrode assembly, and the rigidity of the first conductive plate. Is higher than the rigidity of the second conductive plate,
A third conductive plate disposed between the case and the second conductive plate;
A fourth conductive plate disposed between the case and the third conductive plate;
A second insulating member disposed between the third conductive plate and the fourth conductive plate;
The third conductive plate is electrically connected to one of the positive electrode and the negative electrode;
The fourth conductive plate is electrically connected to the other of the positive electrode and the negative electrode;
The power storage device, wherein the rigidity of the first conductive plate is higher than any of the rigidity of the second conductive plate, the rigidity of the third conductive plate, and the rigidity of the fourth conductive plate. 前記電極組立体の最も外側の層は前記負極であり、
前記第１導電板が、前記負極と電気的に接続されており、
前記第１導電板の剛性が、前記第１導電板に隣接する前記負極の剛性よりも高い、請求項１記載の蓄電装置。 The outermost layer of the electrode assembly is the negative electrode;
The first conductive plate is electrically connected to the negative electrode;
The power storage device according to claim 1, wherein the rigidity of the first conductive plate is higher than the rigidity of the negative electrode adjacent to the first conductive plate. 前記第１導電板の厚みが、前記第２導電板の厚み、前記第３導電板の厚み、及び前記第４導電板の厚みのいずれよりも大きい、請求項１または２記載の蓄電装置。   The power storage device according to claim 1 or 2, wherein a thickness of the first conductive plate is larger than any of a thickness of the second conductive plate, a thickness of the third conductive plate, and a thickness of the fourth conductive plate. 前記第１導電板のヤング率が、前記第２導電板のヤング率、前記第３導電板のヤング率、及び前記第４導電板のヤング率のいずれよりも大きい、請求項１〜３のいずれか一項記載の蓄電装置。   The Young's modulus of the first conductive plate is larger than any of the Young's modulus of the second conductive plate, the Young's modulus of the third conductive plate, and the Young's modulus of the fourth conductive plate. The power storage device according to claim 1. ケースと、
前記ケース内に収容された電極組立体と、
前記ケースと前記電極組立体との間に配置された第１導電板と、
前記ケースと前記第１導電板との間に配置された第２導電板と、
前記第１導電板と前記第２導電板との間に配置された絶縁部材と、を備え、
前記電極組立体は、正極と、負極と、前記正極と前記負極との間に配置されたセパレータと、を備え、
前記第１導電板が、前記正極及び前記負極の一方と電気的に接続されており、
前記第２導電板が、前記正極及び前記負極の他方と電気的に接続されており、
前記第１導電板の剛性が、前記電極組立体の前記正極及び前記負極のうち前記第１導電板に最も近接する前記正極または前記負極の剛性よりも高く、かつ、前記第１導電板の剛性が前記第２導電板の剛性よりも高く、
前記第１導電板はステンレス製である、蓄電装置。 Case and
An electrode assembly housed in the case;
A first conductive plate disposed between the case and the electrode assembly;
A second conductive plate disposed between the case and the first conductive plate;
An insulating member disposed between the first conductive plate and the second conductive plate,
The electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode,
The first conductive plate is electrically connected to one of the positive electrode and the negative electrode;
The second conductive plate is electrically connected to the other of the positive electrode and the negative electrode;
The rigidity of the first conductive plate is higher than the rigidity of the positive electrode or the negative electrode closest to the first conductive plate among the positive electrode and the negative electrode of the electrode assembly, and the rigidity of the first conductive plate. Is higher than the rigidity of the second conductive plate,
The power storage device, wherein the first conductive plate is made of stainless steel. 前記蓄電装置が二次電池である、請求項１〜５のいずれか一項記載の蓄電装置。 The power storage device according to any one of claims 1 to 5 , wherein the power storage device is a secondary battery.
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