JP2013145717A - Power storage device and vehicle - Google Patents
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- JP2013145717A JP2013145717A JP2012006368A JP2012006368A JP2013145717A JP 2013145717 A JP2013145717 A JP 2013145717A JP 2012006368 A JP2012006368 A JP 2012006368A JP 2012006368 A JP2012006368 A JP 2012006368A JP 2013145717 A JP2013145717 A JP 2013145717A
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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- 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
Abstract
Description
本発明は、正極と負極との間を絶縁してこれらを層状に形成してなる電極体を備えた蓄電装置、及び蓄電装置が搭載された車両に関する。 The present invention relates to a power storage device including an electrode body formed by insulating a positive electrode and a negative electrode and forming them in layers, and a vehicle equipped with the power storage device.
電極体を収容するケース内の温度が所定の作動温度以上に上昇した場合に電流を遮断する機構を備えたものとして、例えば特許文献１に開示されているものがある。図１０に示すように、特許文献１の二次電池９０は、図示しない正極、負極及びセパレータからなる電極体９１が、電解液と共にケース９２内に収容されることで構成されている。ケース９２は、開口部を有するケース本体９２ａと、その開口部を塞ぐ蓋体９２ｂとから構成されている。 For example, Patent Document 1 discloses a device that includes a mechanism that cuts off a current when the temperature inside the case housing the electrode body rises above a predetermined operating temperature. As shown in FIG. 10, the secondary battery 90 of Patent Document 1 is configured by housing an electrode body 91 including a positive electrode, a negative electrode, and a separator (not shown) together with an electrolytic solution in a case 92. The case 92 includes a case main body 92a having an opening and a lid 92b that closes the opening.
ケース本体９２ａはニッケルメッキ鋼板製であって、電極体９１の負極に接続された負極集電板９３（負極側集電端子）が底部内面に接合されることによりケース本体９２ａが負極側の外部端子（負極端子）を兼ねるように構成されている。蓋体９２ｂは、金属板からなる封口板９４と、封口板９４の外周部に固定された樹脂製の筒部９５と、筒部９５とは反対側に突出する正極側の外部端子９６（正極端子）とを有する。この蓋体９２ｂを筒部９５側からケース本体９２ａの開口部に挿入し、絶縁封止材９２ｃを介して封口板９４の外周にケース本体９２ａの開口端をかしめることにより、封口板９４とケース本体９２ａとの間を絶縁するとともに、ケース本体９２ａの開口部を気密に封止してケース９２の密閉構造が構築されている。 The case main body 92a is made of a nickel-plated steel plate, and a negative electrode current collecting plate 93 (negative electrode side current collecting terminal) connected to the negative electrode of the electrode body 91 is joined to the inner surface of the bottom portion. It is comprised so that it may serve as a terminal (negative electrode terminal). The lid 92b includes a sealing plate 94 made of a metal plate, a resin-made cylinder portion 95 fixed to the outer peripheral portion of the sealing plate 94, and an external terminal 96 (positive electrode) on the positive electrode side protruding from the opposite side of the cylinder portion 95. Terminal). The lid 92b is inserted into the opening of the case main body 92a from the cylindrical portion 95 side, and the opening end of the case main body 92a is caulked to the outer periphery of the sealing plate 94 via the insulating sealing material 92c. The case body 92a is insulated from the case main body 92a, and the opening of the case main body 92a is hermetically sealed to construct a sealed structure of the case 92.
筒部９５の内側に位置する封口板９４の内側面には、金属製の接続部材９７が溶接部９８により固定されている。接続部材９７は、溶接部９８を中心とする回転対称形状であって、長方形状の平面部９７ａと、その一方の長辺の一端側と他方の長辺の他端側からそれぞれ略垂直に立ち上がる係合部９７ｂとを有している。接続部材９７には、帯状の金属板からなるリード部材９９の一端が溶接により固定されている。また、電極体９１を構成する正極には正極集電板１００（正極側集電端子）が接続されており、この正極集電板１００にリード部材９９の他端が溶接により固定されている。 A metal connection member 97 is fixed to the inner side surface of the sealing plate 94 located inside the cylindrical portion 95 by a welding portion 98. The connection member 97 has a rotationally symmetric shape with the welded portion 98 as the center, and rises substantially vertically from the rectangular flat portion 97a, one end of one long side, and the other end of the other long side. And an engaging portion 97b. One end of a lead member 99 made of a strip-shaped metal plate is fixed to the connection member 97 by welding. The positive electrode constituting the electrode body 91 is connected to a positive electrode current collector plate 100 (positive electrode side current collector terminal), and the other end of the lead member 99 is fixed to the positive electrode current collector plate 100 by welding.
このように、電極体９１を構成する正極は、電極体９１側から順に、正極集電板１００、リード部材９９、接続部材９７及び封口板９４により形成される導電経路を経て、正極側の外部端子９６に電気的に接続されている。二次電池９０の正常時には、上記導電経路を介して電極体９１の正極と外部端子９６との導通が確保されている。 In this way, the positive electrode constituting the electrode body 91 passes through the conductive path formed by the positive electrode current collector plate 100, the lead member 99, the connection member 97, and the sealing plate 94 in this order from the electrode body 91 side to the outside on the positive electrode side. The terminal 96 is electrically connected. When the secondary battery 90 is normal, conduction between the positive electrode of the electrode body 91 and the external terminal 96 is ensured through the conductive path.
また、二次電池９０には、ケース９２内の温度が所定の作動温度以上に上昇した場合に、導電経路を分断して電流を遮断する電流遮断機構１０１を備えている。この電流遮断機構１０１は、上記作動温度に対応する変態温度を有する形状記憶材料により形成された感熱変形部材１０２と、感熱変形部材１０２を支持する支持部１０３とから構成されている。感熱変形部材１０２は、二次電池９０の正常時には丸リベット状をなすとともに、その頭部１０４の先端が接続部材９７の係合部９７ｂに当接するように配置されている。 Further, the secondary battery 90 includes a current interrupt mechanism 101 that interrupts the current by dividing the conductive path when the temperature in the case 92 rises to a predetermined operating temperature or higher. The current interrupting mechanism 101 includes a heat-sensitive deformable member 102 made of a shape memory material having a transformation temperature corresponding to the operating temperature, and a support portion 103 that supports the heat-sensitive deformable member 102. The heat-sensitive deformation member 102 has a round rivet shape when the secondary battery 90 is normal, and is arranged so that the tip of the head 104 abuts on the engagement portion 97 b of the connection member 97.
そして、ケース９２内の温度が感熱変形部材１０２の変態温度以上に上昇すると、感熱変形部材１０２の頭部１０４が棒状に伸びる。すると、頭部１０４が係合部９７ｂを押圧することになり、その押圧力は溶接部９８への回転せん断力として作用する。この回転せん断力が溶接強度に打ち勝つと、溶接部９８を中心に接続部材９７が回転するとともに溶接部９８がねじ切られて、接続部材９７と封口板９４との電気的接続が遮断される。その結果、正極と外部端子９６との電気的接続が遮断される。 When the temperature in the case 92 rises above the transformation temperature of the heat-sensitive deformable member 102, the head 104 of the heat-sensitive deformable member 102 extends in a rod shape. Then, the head 104 presses the engaging portion 97b, and the pressing force acts as a rotational shearing force on the welded portion 98. When this rotational shear force overcomes the welding strength, the connecting member 97 rotates around the welded portion 98 and the welded portion 98 is threaded, and the electrical connection between the connecting member 97 and the sealing plate 94 is interrupted. As a result, the electrical connection between the positive electrode and the external terminal 96 is interrupted.
しかしながら、特許文献１の電流遮断機構１０１では、回転せん断力が溶接強度に打ち勝つためには、相当な回転せん断力が必要になるため、ケース９２内の温度が所定の温度以上に上昇したとき、すなわち、ケース９２内の温度が許容範囲を超えたときに、正極と外部端子９６との電気的接続を速やかに遮断し難いという問題がある。二次電池９０は、充放電に伴う電極体９１の発熱によってケース９２内の温度が許容範囲を超えると不具合が生じる虞がある。 However, in the current interrupt mechanism 101 of Patent Document 1, a considerable rotational shear force is required for the rotational shear force to overcome the welding strength. Therefore, when the temperature in the case 92 rises above a predetermined temperature, That is, there is a problem that it is difficult to quickly disconnect the electrical connection between the positive electrode and the external terminal 96 when the temperature in the case 92 exceeds the allowable range. The secondary battery 90 may have a problem if the temperature in the case 92 exceeds an allowable range due to heat generation of the electrode body 91 due to charge / discharge.
本発明は、上記課題を解決するためになされたものであって、その目的は、ケース内の温度が許容範囲を超えることで不具合が生じてしまうことを防止することができる蓄電装置、及び車両を提供することにある。 The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a power storage device and a vehicle that can prevent a problem from occurring due to the temperature in the case exceeding an allowable range. Is to provide.
上記目的を達成するために、請求項１に記載の発明は、正極と負極との間を絶縁してこれらを層状に形成してなる電極体を備え、前記正極には、正極側集電端子と接続される正極接続部が形成され、前記負極には、負極側集電端子と接続される負極接続部が形成され、前記電極体がケース内に収容されることで構成されている蓄電装置であって、前記正極接続部及び前記負極接続部のうちの少なくとも一方を切断する切断部を有する切断手段が前記ケース内に配設されており、前記切断手段は、少なくとも一部に感熱変形部材で形成された変形部を有しており、前記切断部は、前記変形部の変形により前記正極接続部及び前記負極接続部のうちの少なくとも一方に侵入して、前記正極接続部及び前記負極接続部のうちの少なくとも一方を切断し、前記正極と前記正極側集電端子との電気的接続、及び前記負極と前記負極側集電端子との電気的接続のうちの少なくとも一方の電気的接続を遮断可能に配置されていることを要旨とする。 In order to achieve the above object, the invention according to claim 1 includes an electrode body formed by insulating the positive electrode and the negative electrode and forming them in layers, and the positive electrode includes a positive current collector terminal. A positive electrode connection portion connected to the negative electrode, a negative electrode connection portion connected to a negative electrode current collector terminal is formed on the negative electrode, and the electrode assembly is housed in a case. A cutting means having a cutting portion for cutting at least one of the positive electrode connecting portion and the negative electrode connecting portion is disposed in the case, and the cutting means is at least partially heat-sensitive deformable member. And the cutting portion penetrates into at least one of the positive electrode connection portion and the negative electrode connection portion due to deformation of the deformation portion, and the positive electrode connection portion and the negative electrode connection. Cutting at least one of the parts The electrical connection between the positive electrode and the positive current collector terminal and the electrical connection between the negative electrode and the negative current collector terminal are arranged so as to be cut off. The gist.
この発明によれば、変形部の変形により、切断部が正極接続部及び負極接続部のうちの少なくとも一方を切断することで、正極と正極側集電端子との電気的接続、及び負極と負極側集電端子との電気的接続のうちの少なくとも一方の電気的接続が遮断される。よって、正極接続部及び負極接続部のうちの少なくとも一方を切断部により切断するため、従来技術のように、溶接部のような接続強度の強い部位をねじ切る場合に比べると、正極と正極側集電端子との電気的接続、及び負極と負極側集電端子との電気的接続のうちの少なくとも一方の電気的接続を容易に遮断することができる。その結果として、例えば、充放電に伴う電極体の発熱によってケース内の温度が所定の温度よりも上昇してしまうことを未然に防止することができ、ケース内の温度が許容範囲を超えることで二次電池に不具合が生じてしまうことを防止することができる。 According to this invention, the cutting part cuts at least one of the positive electrode connecting part and the negative electrode connecting part due to the deformation of the deforming part, so that the electrical connection between the positive electrode and the positive current collecting terminal, and the negative electrode and the negative electrode At least one of the electrical connections with the side current collecting terminals is interrupted. Therefore, since at least one of the positive electrode connecting portion and the negative electrode connecting portion is cut by the cutting portion, the positive electrode and the positive electrode side are compared with the case of cutting a portion having a strong connection strength such as a welded portion as in the prior art. At least one of the electrical connection with the current collector terminal and the electrical connection between the negative electrode and the negative current collector terminal can be easily interrupted. As a result, for example, it is possible to prevent the temperature inside the case from rising above a predetermined temperature due to heat generation of the electrode body due to charge and discharge, and the temperature inside the case exceeds the allowable range. It can prevent that a malfunction arises in a secondary battery.
請求項２に記載の発明は、請求項１に記載の発明において、前記切断部は前記感熱変形部材により形成されていることを要旨とする。
この発明によれば、例えば、切断部を感熱変形部材により一体形成することができるため、切断部を感熱変形部材とは別の材料で形成するとともに、切断手段における感熱変形部材により形成された変形部の変形により切断部の切断動作を付与する切断手段の構成に比べると、切断手段の構成を簡素化することができる。
The gist of the invention according to claim 2 is that, in the invention according to claim 1, the cutting portion is formed by the heat-sensitive deformation member.
According to this invention, for example, since the cutting part can be formed integrally with the heat-sensitive deformation member, the cutting part is formed of a material different from that of the heat-sensitive deformation member, and the deformation formed by the heat-sensitive deformation member in the cutting means. The configuration of the cutting means can be simplified compared to the configuration of the cutting means that imparts the cutting operation of the cutting portion by deformation of the portion.
請求項３に記載の発明は、請求項１又は請求項２に記載の発明において、前記切断部により前記正極接続部及び前記負極接続部のうちの少なくとも一方が切断された際に、前記切断手段における前記正極と前記正極側集電端子との間に位置する部位、及び前記負極と前記負極側集電端子との間に位置する部位が少なくとも絶縁コーティングされていることを要旨とする。 The invention according to claim 3 is the invention according to claim 1 or 2, wherein at least one of the positive electrode connecting portion and the negative electrode connecting portion is cut by the cutting portion, the cutting means. In summary, at least a portion located between the positive electrode and the positive current collecting terminal and a portion located between the negative electrode and the negative current collecting terminal are coated with insulation.
この発明によれば、切断部により正極接続部及び負極接続部のうちの少なくとも一方を切断した後に、正極と正極側集電端子との電気的接続、及び負極と負極側集電端子との電気的接続のうちの少なくとも一方の電気的接続が再び接続状態になってしまうことを防止することができる。 According to this invention, after cutting at least one of the positive electrode connecting portion and the negative electrode connecting portion by the cutting portion, the electric connection between the positive electrode and the positive electrode side current collecting terminal, and the electric connection between the negative electrode and the negative electrode side current collecting terminal. It is possible to prevent the electrical connection of at least one of the general connections from becoming a connected state again.
請求項４に記載の発明は、請求項１〜請求項３のいずれか一項に記載の発明において、前記切断部は、前記正極接続部を切断することを要旨とする。
正極の母材となる金属箔はアルミニウム箔であるとともに、負極の母材となる金属箔は銅箔である。アルミニウム箔は銅箔よりも柔らかいため、アルミニウム箔は銅箔に比べて切断部により切断し易い。よって、正極接続部を切断部により切断することで、充放電に伴う電極体の発熱によってケース内の温度が所定の温度よりも上昇してしまうことを未然に防止し易くすることができる。
Invention of Claim 4 makes it a summary to cut | disconnect the said positive electrode connection part in the invention as described in any one of Claims 1-3.
The metal foil that is the base material of the positive electrode is an aluminum foil, and the metal foil that is the base material of the negative electrode is a copper foil. Since the aluminum foil is softer than the copper foil, the aluminum foil is easier to cut at the cutting portion than the copper foil. Therefore, by cutting the positive electrode connecting portion with the cutting portion, it is possible to easily prevent the temperature in the case from rising above a predetermined temperature due to heat generation of the electrode body accompanying charge / discharge.
請求項５に記載の発明は、請求項１〜請求項４のいずれか一項に記載の発明において、前記正極接続部及び前記負極接続部には、前記切断部によって切断される切断部位に延びる切り込みが形成されていることを要旨とする。 The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the positive electrode connecting portion and the negative electrode connecting portion extend to a cutting site cut by the cutting portion. The gist is that a cut is formed.
この発明によれば、正極接続部及び負極接続部に切り込みを形成することで、正極接続部及び負極接続部に強度の弱い部位を形成することができる。よって、正極接続部及び負極接続部における切断部によって切断される切断部位に切り込みが形成されていない場合に比べると、切断部によって正極接続部及び負極接続部を切断し易くすることができる。 According to this invention, a weak part can be formed in a positive electrode connection part and a negative electrode connection part by forming a notch in a positive electrode connection part and a negative electrode connection part. Therefore, the positive electrode connecting portion and the negative electrode connecting portion can be easily cut by the cutting portion as compared with the case where the cut is not formed at the cutting site cut by the cutting portion in the positive electrode connecting portion and the negative electrode connecting portion.
請求項６に記載の発明は、請求項１〜請求項５のいずれか一項に記載の発明において、前記切断手段は帯状の感熱変形部材が渦捲き状に捲き回されることで形成されるとともに、前記切断手段の先端に前記切断部としての刃部が形成されていることを要旨とする。 According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the cutting means is formed by winding a belt-shaped heat-sensitive deformation member in a spiral shape. In addition, the gist is that a blade portion as the cutting portion is formed at the tip of the cutting means.
この発明によれば、切断手段が、帯状の感熱変形部材が渦捲き状に捲き回されることで形成されている。よって、例えば、帯状の感熱変形部材が渦捲き状に捲き回されておらず、感熱変形部材が直線状に延びるように形成された切断手段がケース内に配設されている場合に比べると、ケース内における切断手段の配置スペースを省スペース化することができる。 According to this invention, the cutting means is formed by winding the belt-like heat-sensitive deformable member in a whirling manner. Therefore, for example, compared to the case where the belt-like heat-sensitive deformable member is not wound in a swirl shape and the cutting means formed so that the heat-sensitive deformable member extends linearly is disposed in the case, Space for disposing the cutting means in the case can be saved.
請求項７に記載の発明は、車両において、請求項１〜請求項６のいずれか一項に記載の蓄電装置が搭載されていることを要旨とする。この発明によれば、請求項１〜請求項６と同様な効果を得ることができる。 The gist of the invention described in claim 7 is that the power storage device according to any one of claims 1 to 6 is mounted in a vehicle. According to the present invention, the same effects as those of claims 1 to 6 can be obtained.
この発明によれば、ケース内の温度が許容範囲を超えることで不具合が生じてしまうことを防止することができる。 According to this invention, it can prevent that a malfunction arises because the temperature in a case exceeds an allowable range.
以下、本発明を車両としてのプラグインハイブリッド車等、又はフォークリフト等の産業車両に搭載される二次電池に具体化した一実施形態を図１〜図５にしたがって説明する。なお、二次電池は、走行モータを駆動するために用いられる。 Hereinafter, an embodiment in which the present invention is embodied in a secondary battery mounted on an industrial vehicle such as a plug-in hybrid vehicle as a vehicle or a forklift will be described with reference to FIGS. The secondary battery is used to drive a travel motor.
図１に示すように、二次電池１０は、電極体１１と、電極体１１を収容するアルミニウム製のケース２０とから構成されている。ケース２０は、一面が開口する有底矩形箱状をなすケース本体２１と、ケース本体２１の開口を閉鎖する矩形板状の蓋２２とから構成されている。ケース２０の内部には電解液が注入されている。蓋２２には、正極端子２２ａ及び負極端子２２ｂが外部に向けて突設されている。 As shown in FIG. 1, the secondary battery 10 includes an electrode body 11 and an aluminum case 20 that houses the electrode body 11. The case 20 includes a case main body 21 having a bottomed rectangular box shape whose one surface is open, and a rectangular plate-shaped lid 22 that closes the opening of the case main body 21. An electrolyte is injected into the case 20. The lid 22 has a positive terminal 22a and a negative terminal 22b projecting outward.
図２に示すように、電極体１１は、帯状の正極１２と帯状の負極１３との間に帯状のセパレータ１４を介在させて正極１２と負極１３とを絶縁し、これらを積層した状態で捲回軸Ｌ周りに渦捲き状に捲回して構成されている。そして、電極体１１は、正極１２、負極１３及びセパレータ１４が渦巻き状に巻回された後、正極１２、負極１３及びセパレータ１４を径方向両側から圧縮することにより扁平状に形成される。 As shown in FIG. 2, the electrode body 11 has a strip-shaped separator 14 interposed between a strip-shaped positive electrode 12 and a strip-shaped negative electrode 13 to insulate the positive electrode 12 and the negative electrode 13 from each other and laminate them. It is configured to wind around the rotation axis L in a spiral manner. The electrode body 11 is formed in a flat shape by compressing the positive electrode 12, the negative electrode 13, and the separator 14 from both sides in the radial direction after the positive electrode 12, the negative electrode 13, and the separator 14 are wound in a spiral shape.
電極体１１は、長径方向（図２に示す矢印Ｙ１の方向）両端に位置する弧状に湾曲するように折り曲げられる両折り曲げ部１７ａ，１７ｂと、長径方向に延びて両折り曲げ部１７ａ，１７ｂ同士を繋ぐ連結部１８とから形成されている。ここで、折り曲げ部１７ａ，１７ｂは、電極体１１において、他の部分よりも曲率が大きくなっている部分をいう。すなわち、本実施形態の電極体１１は、正極１２、負極１３及びセパレータ１４それぞれが連続したものを層状に捲回してなる捲回型の電極体１１である。 The electrode body 11 includes both bent portions 17a and 17b that are bent so as to be curved in an arc shape located at both ends in the major axis direction (the direction of the arrow Y1 shown in FIG. 2), and the bent portions 17a and 17b that extend in the major axis direction. It forms from the connection part 18 to connect. Here, the bent portions 17a and 17b are portions of the electrode body 11 that have a larger curvature than other portions. That is, the electrode body 11 of the present embodiment is a wound electrode body 11 formed by winding a continuous structure of the positive electrode 12, the negative electrode 13, and the separator 14 in layers.
正極１２は、活物質が塗布されている塗工部１２ａと、活物質が塗布されていない未塗工部１２ｂとから形成されている。負極１３は、活物質が塗布されている塗工部１３ａと、活物質が塗布されていない未塗工部１３ｂとから形成されている。なお、正極１２の母材となる金属箔はアルミニウム箔であるとともに、負極１３の母材となる金属箔は銅箔である。 The positive electrode 12 is formed of a coated part 12a to which an active material is applied and an uncoated part 12b to which no active material is applied. The negative electrode 13 is formed of a coated part 13a to which an active material is applied and an uncoated part 13b to which no active material is applied. In addition, while the metal foil used as the base material of the positive electrode 12 is an aluminum foil, the metal foil used as the base material of the negative electrode 13 is a copper foil.
正極１２には、未塗工部１２ｂの一方の縁部１２１ｅから正極１２の長手方向に間隔をおいて突出するタブ部１２ｃが複数形成されている。また、負極１３には、未塗工部１３ｂの一方の縁部１３１ｅから負極１３の長手方向に間隔をおいて突出するタブ部１３ｃが複数形成されている。そして、各タブ部１２ｃ，１３ｃが重なるようして、正極１２、負極１３及びセパレータ１４を捲回することにより、電極体１１の捲回軸Ｌ方向の一端側において同方向に突出する正極タブ１２ｄ及び負極タブ１３ｄが形成されている。 The positive electrode 12 is formed with a plurality of tab portions 12c that protrude from the one edge portion 121e of the uncoated portion 12b with an interval in the longitudinal direction of the positive electrode 12. The negative electrode 13 is formed with a plurality of tab portions 13c that protrude from the one edge portion 131e of the uncoated portion 13b with an interval in the longitudinal direction of the negative electrode 13. Then, by winding the positive electrode 12, the negative electrode 13, and the separator 14 so that the tab portions 12 c and 13 c overlap, the positive electrode tab 12 d that protrudes in the same direction on one end side in the winding axis L direction of the electrode body 11. And the negative electrode tab 13d is formed.
図１に示すように、正極タブ１２ｄには正極側集電端子１９ａの一端が接続されるとともに、正極側集電端子１９ａの他端は正極端子２２ａに接続されている。また、負極タブ１３ｄには負極側集電端子１９ｂの一端が接続されるとともに、負極側集電端子１９ｂの他端は負極端子２２ｂに接続されている。よって、正極タブ１２ｄは、正極１２における正極側集電端子１９ａとの正極接続部として機能するとともに、負極タブ１３ｄは、負極１３における負極側集電端子１９ｂとの負極接続部として機能する。 As shown in FIG. 1, one end of a positive current collecting terminal 19a is connected to the positive electrode tab 12d, and the other end of the positive current collecting terminal 19a is connected to a positive electrode terminal 22a. The negative electrode tab 13d is connected to one end of the negative electrode side current collecting terminal 19b and the other end of the negative electrode side current collecting terminal 19b is connected to the negative electrode terminal 22b. Therefore, the positive electrode tab 12d functions as a positive electrode connection portion with the positive electrode side current collecting terminal 19a in the positive electrode 12, and the negative electrode tab 13d functions as a negative electrode connection portion with the negative electrode side current collector terminal 19b in the negative electrode 13.
図２に示すように、正極１２の各タブ部１２ｃには切り込み形成部２５ａが形成されている。各切り込み形成部２５ａは、正極１２、負極１３及びセパレータ１４が捲回されたときに、各切り込み形成部２５ａが電極体１１の短径方向に沿って並ぶ位置に形成されている。そして、各切り込み形成部２５ａにより、正極タブ１２ｄには、正極タブ１２ｄにおける負極タブ１３ｄと対向する側から電極体１１の長径方向（電極体１１の捲回軸Ｌ方向）に沿って延びる切り込み２５が形成されている。切り込み２５は、正極タブ１２ｄにおける電極体１１の短径方向全体に亘って形成されている。正極タブ１２ｄにおける切り込み２５が形成されている部位は、正極タブ１２ｄにおける強度の弱い部位になっている。 As shown in FIG. 2, a notch forming portion 25 a is formed in each tab portion 12 c of the positive electrode 12. Each notch forming part 25a is formed at a position where each notch forming part 25a is aligned along the minor axis direction of the electrode body 11 when the positive electrode 12, the negative electrode 13 and the separator 14 are wound. Each notch forming portion 25a causes the positive electrode tab 12d to have a cut 25 extending along the major axis direction of the electrode body 11 (winding axis L direction) from the side of the positive electrode tab 12d facing the negative electrode tab 13d. Is formed. The cut 25 is formed over the entire minor axis direction of the electrode body 11 in the positive electrode tab 12d. The part where the notch 25 is formed in the positive electrode tab 12d is a weak part in the positive electrode tab 12d.
図３（ａ）及び（ｂ）に示すように、ケース２０内における電極体１１と蓋２２との間の空間Ｋには、切断手段３０が配設されている。切断手段３０全体は、帯状の感熱変形部材（形状記憶合金）が渦捲き状に捲き回されることで形成されている。切断手段３０全体は絶縁コーティングされている。切断手段３０の先端３０ａには切断部としての刃部３２が形成されている。刃部３２は、感熱変形部材により形成されるとともに、正極タブ１２ｄの切り込み２５に対向配置されている。図３（ｂ）に示すように、切断手段３０の短手方向の長さＬ１は、電極体１１の短径方向の長さＬ２よりも長くなっている。切断手段３０は、蓋２２におけるケース２０の内側の面である裏面２２１に固着された一対の支持部３３に支持されている。 As shown in FIGS. 3A and 3B, a cutting means 30 is disposed in a space K between the electrode body 11 and the lid 22 in the case 20. The entire cutting means 30 is formed by winding a band-shaped heat-sensitive deformable member (shape memory alloy) in a spiral shape. The entire cutting means 30 is insulated. A blade portion 32 as a cutting portion is formed at the tip 30 a of the cutting means 30. The blade portion 32 is formed of a heat-sensitive deformable member and is disposed so as to face the notch 25 of the positive electrode tab 12d. As shown in FIG. 3 (b), the length L 1 in the short direction of the cutting means 30 is longer than the length L 2 in the short diameter direction of the electrode body 11. The cutting means 30 is supported by a pair of support portions 33 fixed to the back surface 221 which is the inner surface of the case 20 in the lid 22.
そして、正極タブ１２ｄと正極端子２２ａとが正極側集電端子１９ａを介して電気的に接続されるとともに、負極タブ１３ｄと負極端子２２ｂとが負極側集電端子１９ｂを介して電気的に接続された電極体１１をケース２０に収容し、蓋２２によりケース本体２１の開口を閉鎖することで二次電池１０が構成される。 The positive electrode tab 12d and the positive electrode terminal 22a are electrically connected through the positive electrode side current collecting terminal 19a, and the negative electrode tab 13d and the negative electrode terminal 22b are electrically connected through the negative electrode side current collecting terminal 19b. The secondary battery 10 is configured by housing the electrode body 11 thus formed in the case 20 and closing the opening of the case body 21 with the lid 22.
次に、本実施形態の作用について説明する。
二次電池１０において、充放電に伴う電極体１１の発熱によって、ケース２０内の温度が上昇する。ケース２０内の熱は切断手段３０に伝わる。そして、図４に示すように、ケース２０内の温度が所定の温度（本実施形態では約６０℃）に達したときに、ケース２０内の熱によって感熱変形部材が変形する。具体的には、変形部に相当する感熱変形部材の一部が伸びて刃部３２が正極タブ１２ｄの切り込み２５に向かうように変位する。すると、刃部３２が正極タブ１２ｄの切り込み２５を通過して正極タブ１２ｄに侵入して、正極タブ１２ｄの切断部位のみを切断する。ここで、「所定の温度」とは、ケース２０内の温度において、二次電池１０が正常に動作しなくなることが無い許容範囲内に存在する温度であり、その許容範囲内において上限に近い温度のことである。
Next, the operation of this embodiment will be described.
In the secondary battery 10, the temperature in the case 20 rises due to heat generation of the electrode body 11 due to charge / discharge. The heat in the case 20 is transmitted to the cutting means 30. As shown in FIG. 4, when the temperature in the case 20 reaches a predetermined temperature (about 60 ° C. in the present embodiment), the heat-sensitive deformation member is deformed by the heat in the case 20. Specifically, a part of the heat-sensitive deformable member corresponding to the deformed portion is extended so that the blade portion 32 is displaced toward the notch 25 of the positive electrode tab 12d. Then, the blade portion 32 passes through the notch 25 of the positive electrode tab 12d and enters the positive electrode tab 12d to cut only the cutting portion of the positive electrode tab 12d. Here, the “predetermined temperature” is a temperature that exists within an allowable range in which the secondary battery 10 does not normally operate at the temperature in the case 20, and is a temperature close to the upper limit within the allowable range. That is.
図５に示すように、正極タブ１２ｄが切断されると、正極１２と正極側集電端子１９ａとの電気的接続が遮断され、二次電池１０における充放電が行われなくなる。これによれば、充放電に伴う電極体１１の発熱によってケース２０内の温度が所定の温度よりも上昇してしまうことが未然に防止され、ケース２０内の温度が許容範囲を超えることで二次電池１０に不具合が生じてしまうことが防止される。その結果として、本実施形態の二次電池１０を搭載した車両の走行性能に不具合が生じてしまうことが防止される。 As shown in FIG. 5, when the positive electrode tab 12d is cut, the electrical connection between the positive electrode 12 and the positive current collecting terminal 19a is cut off, and charging / discharging in the secondary battery 10 is not performed. According to this, it is prevented in advance that the temperature in the case 20 rises above a predetermined temperature due to heat generation of the electrode body 11 due to charge / discharge, and the temperature in the case 20 exceeds the allowable range. It is possible to prevent the secondary battery 10 from being defective. As a result, it is possible to prevent a problem from occurring in the running performance of the vehicle equipped with the secondary battery 10 of the present embodiment.
上記実施形態では以下の効果を得ることができる。
（１）二次電池１０において、正極１２の正極タブ１２ｄを切断する刃部３２が形成された感熱変形部材によりなる切断手段３０をケース２０内に配設した。そして、ケース２０内の温度が所定の温度に達したときに、感熱変形部材が変形することで刃部３２により正極タブ１２ｄを切断することで、正極１２と正極側集電端子１９ａとの電気的接続を遮断するようにした。よって、正極１２の正極タブ１２ｄを刃部３２により切断するため、従来技術のように、溶接部のような接続強度の強い部位をねじ切る場合に比べると、正極１２と正極側集電端子１９ａとの電気的接続を容易に遮断することができる。その結果として、例えば、充放電に伴う電極体１１の発熱によってケース２０内の温度が所定の温度よりも上昇してしまうことを未然に防止することができ、ケース２０内の温度が許容範囲を超えることで二次電池１０に不具合が生じてしまうことを防止することができる。
In the above embodiment, the following effects can be obtained.
(1) In the secondary battery 10, a cutting means 30 made of a heat-sensitive deformation member formed with a blade portion 32 for cutting the positive electrode tab 12 d of the positive electrode 12 is disposed in the case 20. When the temperature in the case 20 reaches a predetermined temperature, the heat-sensitive deformable member is deformed so that the positive electrode tab 12d is cut by the blade portion 32, so that the electrical connection between the positive electrode 12 and the positive current collecting terminal 19a is achieved. The connection was closed. Therefore, since the positive electrode tab 12d of the positive electrode 12 is cut by the blade portion 32, the positive electrode 12 and the positive electrode side current collecting terminal 19a are compared with the case of cutting a portion having a strong connection strength such as a welded portion as in the prior art. The electrical connection with can be easily cut off. As a result, for example, it is possible to prevent the temperature in the case 20 from rising above a predetermined temperature due to heat generation of the electrode body 11 due to charge / discharge, and the temperature in the case 20 falls within an allowable range. It can prevent that a malfunction arises in the secondary battery 10 by exceeding.
（２）切断部を、切断手段３０の先端に感熱変形部材により形成された刃部３２とした。よって、切断部を感熱変形部材により一体形成することができるため、切断部を感熱変形部材とは別の材料で形成するとともに、切断手段における感熱変形部材により形成された部位の変形により切断部の切断動作を付与する切断手段の構成に比べると、切断手段３０の構成を簡素化することができる。 (2) The cutting part was a blade part 32 formed by a heat-sensitive deformation member at the tip of the cutting means 30. Therefore, since the cutting part can be formed integrally with the heat-sensitive deformation member, the cutting part is formed of a material different from that of the heat-sensitive deformation member, and the cutting part is deformed by deformation of the part formed by the heat-sensitive deformation member in the cutting means. The configuration of the cutting means 30 can be simplified as compared with the configuration of the cutting means that applies the cutting operation.
（３）切断手段３０全体を絶縁コーティングした。よって、切断手段３０により正極タブ１２ｄを切断した後に、正極１２と正極側集電端子１９ａとの電気的接続が、切断手段３０を介して再び接続状態になってしまうことを防止することができる。 (3) The entire cutting means 30 was coated with insulation. Therefore, after the positive electrode tab 12d is cut by the cutting means 30, it is possible to prevent the electrical connection between the positive electrode 12 and the positive-side current collecting terminal 19a from being connected again via the cutting means 30. .
（４）切断手段３０により正極１２の正極タブ１２ｄのみを切断した。正極１２の母材となる金属箔はアルミニウム箔であるとともに、負極１３の母材となる金属箔は銅箔である。アルミニウム箔は銅箔よりも柔らかいため、アルミニウム箔は銅箔に比べて切断手段３０により切断し易い。よって、正極１２の正極タブ１２ｄを切断手段３０により切断することで、充放電に伴う電極体１１の発熱によってケース２０内の温度が所定の温度よりも上昇してしまうことを未然に防止し易くすることができる。 (4) Only the positive electrode tab 12 d of the positive electrode 12 was cut by the cutting means 30. The metal foil that is the base material of the positive electrode 12 is an aluminum foil, and the metal foil that is the base material of the negative electrode 13 is a copper foil. Since the aluminum foil is softer than the copper foil, the aluminum foil is easier to cut by the cutting means 30 than the copper foil. Therefore, by cutting the positive electrode tab 12d of the positive electrode 12 by the cutting means 30, it is easy to prevent the temperature in the case 20 from rising above a predetermined temperature due to heat generation of the electrode body 11 due to charge / discharge. can do.
（５）正極タブ１２ｄに切り込み２５を形成した。よって、正極タブ１２ｄに切り込み２５を形成することで、正極タブ１２ｄに強度の弱い部位を形成することができる。したがって、正極タブ１２ｄに切り込み２５が形成されていない場合に比べると、切断手段３０の刃部３２によって正極タブ１２ｄを切断し易くすることができる。 (5) A cut 25 was formed in the positive electrode tab 12d. Therefore, by forming the notch 25 in the positive electrode tab 12d, it is possible to form a weak portion in the positive electrode tab 12d. Therefore, compared with the case where the notch 25 is not formed in the positive electrode tab 12d, the positive electrode tab 12d can be easily cut by the blade portion 32 of the cutting means 30.
（６）切断手段３０を、帯状の感熱変形部材を渦捲き状に捲き回すことで形成するとともに、その先端３０ａに刃部３２を形成した。よって、例えば、帯状の感熱変形部材が渦捲き状に捲き回されておらず、感熱変形部材が直線状に延びるように形成された切断手段がケース２０内に配設されている場合に比べると、ケース２０内における切断手段３０の配置スペースを省スペース化することができる。 (6) The cutting means 30 was formed by whirling a belt-like heat-sensitive deformable member, and the blade portion 32 was formed at the tip 30a. Therefore, for example, as compared with the case where the belt-like heat-sensitive deformable member is not wound in a whirling manner, and the cutting means formed so that the heat-sensitive deformable member extends linearly is disposed in the case 20. The space for arranging the cutting means 30 in the case 20 can be saved.
なお、上記実施形態は以下のように変更してもよい。
○ 図６及び図７に示すような切断手段６０としてもよい。図６及び図７に示すように、切断手段６０は、直線状に延びる平板状の金属板を平面視Ｕ字状に屈曲形成した感熱変形部材により形成されている。切断手段６０の屈曲部６０ａよりも基端側は、蓋２２の裏面２２１に固着された支持部６３により支持されている。また、切断手段６０の屈曲部６０ａよりも先端側には、切断部としての刃部６２が形成されている。
In addition, you may change the said embodiment as follows.
O It is good also as the cutting means 60 as shown in FIG.6 and FIG.7. As shown in FIGS. 6 and 7, the cutting means 60 is formed of a heat-sensitive deformable member formed by bending a linear metal plate that extends linearly into a U shape in plan view. The proximal end side of the bending means 60 a of the cutting means 60 is supported by a support portion 63 fixed to the back surface 221 of the lid 22. Further, a blade portion 62 as a cutting portion is formed on the distal end side of the bending portion 60 a of the cutting means 60.
そして、充放電に伴う電極体１１の発熱によって、ケース２０内の温度が上昇すると、ケース２０内の熱は切断手段６０に伝わる。さらに、ケース２０内の温度が所定の温度（本実施形態では約６０℃）に達したときに、ケース２０内の熱によって切断手段６０が変形する。具体的には、図７（ａ）に示すように、屈曲部６０ａが屈曲した状態から直線状に延びた状態になろうとする。このとき、切断手段６０の刃部６２が正極タブ１２ｄの切り込み２５を通過して正極タブ１２ｄのみを切断する。そして、図７（ｂ）及び（ｃ）に示すように、正極タブ１２ｄが切断されると、正極１２と正極側集電端子１９ａとの電気的接続が遮断され、二次電池１０における充放電が行われなくなる。 Then, when the temperature in the case 20 rises due to heat generation of the electrode body 11 due to charge / discharge, the heat in the case 20 is transmitted to the cutting means 60. Furthermore, when the temperature in the case 20 reaches a predetermined temperature (about 60 ° C. in this embodiment), the cutting means 60 is deformed by the heat in the case 20. Specifically, as shown in FIG. 7A, the bent portion 60a tends to extend from a bent state to a linear shape. At this time, the blade portion 62 of the cutting means 60 passes through the notch 25 of the positive electrode tab 12d and cuts only the positive electrode tab 12d. 7 (b) and 7 (c), when the positive electrode tab 12d is cut, the electrical connection between the positive electrode 12 and the positive electrode side current collecting terminal 19a is cut off, and charging / discharging in the secondary battery 10 is performed. Will not be performed.
○ 図８及び図９に示すような切断手段８０としてもよい。図８及び図９に示すように、切断手段８０は、紐状をなす感熱変形部材により形成されている。切断手段８０は、正極タブ１２ｄの周りを一周するように配設されている。切断手段８０の一端は、蓋２２の裏面２２１に固着された支持部８３により支持されている。 A cutting means 80 as shown in FIGS. 8 and 9 may be used. As shown in FIGS. 8 and 9, the cutting means 80 is formed by a heat-sensitive deformable member having a string shape. The cutting means 80 is disposed so as to go around the positive electrode tab 12d. One end of the cutting means 80 is supported by a support portion 83 fixed to the back surface 221 of the lid 22.
そして、充放電に伴う電極体１１の発熱によって、ケース２０内の温度が上昇すると、ケース２０内の熱は切断手段８０に伝わる。さらに、ケース２０内の温度が所定の温度（本実施形態では約６０℃）に達したときに、ケース２０内の熱によって切断手段８０が変形する。具体的には、図９（ａ）に示すように、切断手段８０が正極タブ１２ｄを締め付けるように変形しようとする。そして、図９（ｂ）及び（ｃ）に示すように、切断手段８０における正極タブ１２ｄへの締め付け力により、正極タブ１２ｄが切断手段８０により分断（切断）される。これにより、正極１２と正極側集電端子１９ａとの電気的接続が遮断され、二次電池１０における充放電が行われなくなる。よって、図８及び図９に示す別例では、切断手段８０における正極タブ１２ｄを締め付ける部位が切断部として機能している。 When the temperature in the case 20 rises due to the heat generated by the electrode body 11 due to charge / discharge, the heat in the case 20 is transmitted to the cutting means 80. Furthermore, when the temperature in the case 20 reaches a predetermined temperature (about 60 ° C. in the present embodiment), the cutting means 80 is deformed by the heat in the case 20. Specifically, as shown in FIG. 9A, the cutting means 80 tries to deform so as to tighten the positive electrode tab 12d. Then, as shown in FIGS. 9B and 9C, the positive electrode tab 12 d is divided (cut) by the cutting means 80 by the tightening force applied to the positive electrode tab 12 d by the cutting means 80. Thereby, the electrical connection between the positive electrode 12 and the positive current collecting terminal 19a is cut off, and charging / discharging in the secondary battery 10 is not performed. Therefore, in another example shown in FIG. 8 and FIG. 9, a portion for fastening the positive electrode tab 12 d in the cutting means 80 functions as a cutting portion.
○ 実施形態において、正極１２の各タブ部１２ｃに切り込み形成部２５ａを形成せずに、正極１２、負極１３及びセパレータ１４が捲回して正極タブ１２ｄが形成された後に、正極タブ１２ｄに切り込み２５を形成してもよい。 In the embodiment, the positive electrode 12, the negative electrode 13, and the separator 14 are wound to form the positive electrode tab 12 d without forming the notch forming portion 25 a in each tab portion 12 c of the positive electrode 12, and then the positive electrode tab 12 d is cut 25. May be formed.
○ 実施形態において、正極タブ１２ｄに切り込み２５が形成されていなくてもよい。
○ 実施形態において、正極１２の正極タブ１２ｄのみを切断手段３０の刃部３２により切断したが、これに限らず、負極１３の負極タブ１３ｄのみを切断手段３０の刃部３２により切断してもよい。このとき、負極タブ１３ｄに切り込み２５が形成されていてもよい。
In the embodiment, the notch 25 may not be formed in the positive electrode tab 12d.
In the embodiment, only the positive electrode tab 12 d of the positive electrode 12 is cut by the blade portion 32 of the cutting means 30, but not limited thereto, even if only the negative electrode tab 13 d of the negative electrode 13 is cut by the blade portion 32 of the cutting means 30. Good. At this time, the notch 25 may be formed in the negative electrode tab 13d.
○ 実施形態において、正極１２の正極タブ１２ｄ及び負極１３の負極タブ１３ｄの両方を切断手段３０の刃部３２により切断してもよい。この場合、正極１２の正極タブ１２ｄを切断するための切断手段と、負極１３の負極タブ１３ｄを切断するための切断手段とをそれぞれ別途設けるとよい。 In the embodiment, both the positive electrode tab 12 d of the positive electrode 12 and the negative electrode tab 13 d of the negative electrode 13 may be cut by the blade portion 32 of the cutting means 30. In this case, a cutting means for cutting the positive electrode tab 12d of the positive electrode 12 and a cutting means for cutting the negative electrode tab 13d of the negative electrode 13 may be provided separately.
○ 実施形態において、切断手段３０全体を絶縁コーティングしなくてもよい。また、例えば、切断手段３０により正極タブ１２ｄを切断した後に、切断手段３０における正極１２と正極側集電端子１９ａとの間に位置する部位のみが、最低限、絶縁コーティングされているようにしてもよい。 In the embodiment, the entire cutting means 30 may not be insulated. Further, for example, after the positive electrode tab 12d is cut by the cutting means 30, only a portion of the cutting means 30 located between the positive electrode 12 and the positive-side current collecting terminal 19a is at least insulatedly coated. Also good.
○ 実施形態において、切断部を感熱変形部材とは別の材料で形成してもよい。そして、切断手段における感熱変形部材により形成された変形部の変形により切断部の切断動作を付与するような切断手段の構成としてもよい。 In the embodiment, the cut portion may be formed of a material different from the heat-sensitive deformable member. And it is good also as a structure of the cutting | disconnection means which provides the cutting | disconnection operation | movement of a cutting | disconnection part by deformation | transformation of the deformation | transformation part formed of the heat-sensitive deformation member in a cutting | disconnection means.
○ 実施形態において、正極タブ１２ｄ及び負極タブ１３ｄが、電極体１１の捲回軸Ｌ方向において互いに反対側に突出するように形成されていてもよい。
○ 実施形態では、帯状の正極１２と負極１３との間に帯状のセパレータ１４を介在させて、これらを捲回軸Ｌ周りに渦捲き状に捲回して構成された捲回型の電極体１１を用いたが、これに限らない。例えば、正極と負極との間にセパレータを介在させて、これらを一定方向に複数積層して構成された積層型の電極体を用いてもよい。ここで、積層型の電極体とは、正極、負極及びセパレータそれぞれが不連続となったものを一定方向に積層してなる電極体のことである。
In embodiment, the positive electrode tab 12d and the negative electrode tab 13d may be formed so that it may protrude on the opposite side in the winding axis L direction of the electrode body 11.
In the embodiment, the wound electrode body 11 is configured by interposing a strip-shaped separator 14 between the strip-shaped positive electrode 12 and the negative electrode 13 and winding them around the winding axis L in a spiral manner. However, the present invention is not limited to this. For example, a laminated electrode body configured by interposing a separator between a positive electrode and a negative electrode and laminating a plurality of them in a certain direction may be used. Here, the laminated electrode body is an electrode body formed by laminating a discontinuous structure of the positive electrode, the negative electrode, and the separator in a certain direction.
○ 実施形態において、二次電池１０はプラグインハイブリッド車等、又はフォークリフト等の産業車両に搭載されていたが、これに限らず、例えば、電気自動車に搭載されていてもよい。 In the embodiment, the secondary battery 10 is mounted on an industrial vehicle such as a plug-in hybrid vehicle or a forklift, but is not limited thereto, and may be mounted on an electric vehicle, for example.
○ 本発明を、車両用の二次電池１０に具体化したが、これに限らず、車両用以外の二次電池に具体化してもよい。
○ 本発明を、電気二重層コンデンサ等の蓄電装置に具体化してもよい。
The present invention has been embodied in the vehicle secondary battery 10, but is not limited thereto, and may be embodied in a secondary battery other than the vehicle.
The present invention may be embodied in a power storage device such as an electric double layer capacitor.
１０…蓄電装置としての二次電池、１１…電極体、１２…正極、１２ｄ…正極接続部としての正極タブ、１３…負極、１３ｄ…負極接続部としての負極タブ、１９ａ…正極側集電端子、１９ｂ…負極側集電端子、２０…ケース、２５…切り込み、３０，６０，８０…切断手段、３０ａ…先端、３２，６２…切断部としての刃部。 DESCRIPTION OF SYMBOLS 10 ... Secondary battery as an electrical storage device, 11 ... Electrode body, 12 ... Positive electrode, 12d ... Positive electrode tab as a positive electrode connection part, 13 ... Negative electrode, 13d ... Negative electrode tab as a negative electrode connection part, 19a ... Positive electrode side current collection terminal , 19b ... negative electrode side current collecting terminal, 20 ... case, 25 ... notch, 30, 60, 80 ... cutting means, 30a ... tip, 32, 62 ... blade part as cutting part.
Claims (7)
前記正極接続部及び前記負極接続部のうちの少なくとも一方を切断する切断部を有する切断手段が前記ケース内に配設されており、
前記切断手段は、少なくとも一部に感熱変形部材で形成された変形部を有しており、
前記切断部は、前記変形部の変形により前記正極接続部及び前記負極接続部のうちの少なくとも一方に侵入して、前記正極接続部及び前記負極接続部のうちの少なくとも一方を切断し、前記正極と前記正極側集電端子との電気的接続、及び前記負極と前記負極側集電端子との電気的接続のうちの少なくとも一方の電気的接続を遮断可能に配置されていることを特徴とする蓄電装置。 An electrode body is formed by insulating between the positive electrode and the negative electrode and forming them in layers. The positive electrode has a positive electrode connecting portion connected to a positive current collecting terminal, and the negative electrode has a negative electrode A power storage device configured by forming a negative electrode connecting portion to be connected to a side current collecting terminal, and housing the electrode body in a case;
Cutting means having a cutting part for cutting at least one of the positive electrode connecting part and the negative electrode connecting part is disposed in the case,
The cutting means has at least a deformed portion formed of a heat-sensitive deformable member,
The cutting portion penetrates into at least one of the positive electrode connection portion and the negative electrode connection portion by deformation of the deformation portion, cuts at least one of the positive electrode connection portion and the negative electrode connection portion, and the positive electrode And at least one of the electrical connection between the positive electrode side current collecting terminal and the negative electrode and the negative electrode side current collecting terminal is arranged to be cut off. Power storage device.
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