JP2009176917A - Nonaqueous electrolyte storage battery device - Google Patents
Nonaqueous electrolyte storage battery device Download PDFInfo
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- JP2009176917A JP2009176917A JP2008013465A JP2008013465A JP2009176917A JP 2009176917 A JP2009176917 A JP 2009176917A JP 2008013465 A JP2008013465 A JP 2008013465A JP 2008013465 A JP2008013465 A JP 2008013465A JP 2009176917 A JP2009176917 A JP 2009176917A
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- 238000003860 storage Methods 0.000 title claims abstract description 62
- 239000011255 nonaqueous electrolyte Substances 0.000 title claims abstract description 34
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 20
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims abstract description 5
- 239000003115 supporting electrolyte Substances 0.000 claims abstract description 4
- 229910003002 lithium salt Inorganic materials 0.000 claims abstract description 3
- 159000000002 lithium salts Chemical class 0.000 claims abstract description 3
- 230000005611 electricity Effects 0.000 claims description 37
- 239000007788 liquid Substances 0.000 claims description 22
- 239000008151 electrolyte solution Substances 0.000 claims description 3
- 230000005855 radiation Effects 0.000 abstract description 7
- 238000007599 discharging Methods 0.000 abstract description 2
- 239000003792 electrolyte Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 5
- 239000002826 coolant Substances 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 230000020169 heat generation Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000005001 laminate film Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
Abstract
Description
この発明は、非水電解質蓄電デバイスに関し、具体的には、炭素材料からなる正極と、リチウムの吸蔵・放出が可能な材料からなる負極とがセパレータを介して対向配置されてなる電極体をリチウム塩を支持電解質とした電解液とともに密封してなる非水電解質蓄電デバイスに関する。具体的には、非水電解質蓄電デバイスにおける発熱防止技術に関し、とくに、上記電極体を多数積層した構造の非水電解質蓄電デバイスに利用して有効である。 The present invention relates to a non-aqueous electrolyte electricity storage device, and specifically, an electrode body in which a positive electrode made of a carbon material and a negative electrode made of a material capable of occluding and releasing lithium are arranged to face each other with a separator interposed therebetween. The present invention relates to a non-aqueous electrolyte electricity storage device that is hermetically sealed together with an electrolyte containing a salt as a supporting electrolyte. Specifically, the present invention relates to a heat generation prevention technique in a non-aqueous electrolyte power storage device, and is particularly effective when used for a non-aqueous electrolyte power storage device having a structure in which a large number of the electrode bodies are stacked.
図５に一般的な非水電解質蓄電デバイスの基本構造を示した。（Ａ）は非水電解質蓄電デバイス１ｄの透視平面図であり、（Ｂ）はその側断面図である。非水電解質蓄電デバイス１ｄにおける正負それぞれの極（１０ｐ，１０ｎ）は、集電体となるシート状導電体（１１ｐ，１１ｎ）の表面にそれぞれの極の活物質を塗布してなり、非水電解質蓄電デバイス１ｄは、この正負両極（１０ｐ，１０ｎ）をセパレータ３０を介して対向配置させた積層構造をなす電極体（積層体）を基本構造とし、その積層体をラミネートフィルムをヒートシールしてなる袋状の外装体１００内に電解液とともに収納した後、袋の口を真空封止してなっている。 FIG. 5 shows a basic structure of a general nonaqueous electrolyte electricity storage device. (A) is a perspective plan view of the nonaqueous electrolyte electricity storage device 1d, and (B) is a side sectional view thereof. Each of the positive and negative electrodes (10p, 10n) in the nonaqueous electrolyte electricity storage device 1d is formed by applying an active material of each electrode on the surface of a sheet-like conductor (11p, 11n) serving as a current collector. The electricity storage device 1d has a basic structure of an electrode body (laminated body) having a laminated structure in which the positive and negative electrodes (10p, 10n) are arranged to face each other with a separator 30 therebetween, and the laminated body is heat-sealed with a laminated film. After being accommodated in the bag-shaped outer package 100 together with the electrolytic solution, the bag mouth is vacuum-sealed.
非水電解質蓄電デバイス１ｄにおけるシート状導電体（１１ｐ，１１ｎ）には電力の取り出し口となる電極部（１２ｐ，１２ｎ）が形成され、この電極部（１２ｐ，１２ｎ）に、タブと呼ばれる金属プレートからなる外部リード端子４０ｄが超音波溶接などによって接続されている。なお、ラミネートフィルムは、外部リード端子４０ｄの延長方向の途中の所定位置１０１でヒートシールされて、外部リード端子４０ｄの先端は外装体１００の外に露出している。 The sheet-like conductors (11p, 11n) in the nonaqueous electrolyte electricity storage device 1d are formed with electrode portions (12p, 12n) serving as power outlets, and a metal plate called a tab is formed on the electrode portions (12p, 12n). The external lead terminal 40d made of is connected by ultrasonic welding or the like. The laminate film is heat-sealed at a predetermined position 101 in the extension direction of the external lead terminal 40d, and the tip of the external lead terminal 40d is exposed outside the exterior body 100.
非水電解質蓄電デバイスは、急速充放電が可能である本来の特性とともに、高いエネルギー容量特性を得るために、図５に示したような単体の積層体によって構成するより、例えば、３０〜５０層にも積層した多層構造とする場合が多い。そして、この多層構造により、非水電解質蓄電デバイスは、大電流による充放電が可能となり、風力発電の負荷平準化装置、瞬低対策装置、自動車における回生電力の蓄電用途などに利用されることが期待されている。 In order to obtain high energy capacity characteristics as well as the original characteristics capable of rapid charge / discharge, the non-aqueous electrolyte electricity storage device has, for example, 30 to 50 layers rather than a single laminate as shown in FIG. In many cases, a multi-layered structure is used. This multi-layer structure enables the non-aqueous electrolyte electricity storage device to be charged / discharged with a large current, and can be used for wind power generation load leveling devices, instantaneous voltage reduction devices, regenerative power storage applications in automobiles, etc. Expected.
しかしながら、多層構造の非水電解質蓄電デバイスでは、各層を構成する各積層体のそれぞれの電極部と外部リード端子とを一括して接続することになり、大電流による充放電を行えば、外部リード端子にその大電流が集中して外部リード端子が発熱する。そして、その熱が非水電解質蓄電デバイスの本体に伝わり素子寿命を短くしてしまう、という問題があった。 However, in a non-aqueous electrolyte electricity storage device with a multilayer structure, each electrode part of each laminate constituting each layer and an external lead terminal are connected together, and if charging / discharging with a large current is performed, external leads The large current concentrates on the terminal and the external lead terminal generates heat. And there was a problem that the heat | fever was transmitted to the main body of a nonaqueous electrolyte electrical storage device, and element lifetime was shortened.
本発明は上記課題に鑑みなされたもので、大電流による充放電によっても発熱しにくい外部リード端子構造を備えた非水電解質蓄電デバイスを提供することを目的としている。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a non-aqueous electrolyte electricity storage device having an external lead terminal structure that does not easily generate heat even when charged and discharged by a large current.
上記目的を達成するための本発明は、炭素材料からなる正極と、リチウムの吸蔵・放出が可能な材料からなる負極とがセパレータを介して対向配置されてなる電極体をリチウム塩を支持電解質とした電解液とともに密封してなる非水電解質蓄電デバイスであって、
前記電極体における正負それぞれの電極端部に、金属プレートからなる外部リード端子が接続され、当該外部リード端子には、放熱部が形成されていることを特徴としている。
In order to achieve the above object, the present invention provides an electrode body in which a positive electrode made of a carbon material and a negative electrode made of a material capable of occluding and releasing lithium are arranged to face each other with a separator interposed between a lithium salt and a supporting electrolyte. A non-aqueous electrolyte electricity storage device that is sealed together with the electrolyte solution,
An external lead terminal made of a metal plate is connected to positive and negative electrode ends of the electrode body, and a heat radiating portion is formed in the external lead terminal.
前記放熱部を前記金属プレートの表面に突設された多数の突起とした非水電解質蓄電デバイス、あるいは、前記放熱部を外部リード端子を横断するように形成されたブロックとするともに、当該ブロックの表面に多数の孔を穿設した非水電解質蓄電デバイスとすることができる。上記いずれかの非水電解質蓄電デバイスにおいて、前記放熱部には、前記外部リード端子の表面に沿う液体流路が含まれていてもよい。 The heat dissipating part is a non-aqueous electrolyte electricity storage device having a large number of protrusions protruding on the surface of the metal plate, or the heat dissipating part is a block formed so as to cross an external lead terminal, and the block A nonaqueous electrolyte electricity storage device having a large number of holes on the surface can be obtained. In any one of the above non-aqueous electrolyte electricity storage devices, the heat radiating portion may include a liquid channel along the surface of the external lead terminal.
非水電解質蓄電デバイスの電極端部に接続される外部リード端子に放熱部を備えさえることで、外部リード端子に大電流が流れても発熱を抑止し、非水電解質蓄電デバイスの寿命が熱によって短命化することを防止でき、非水電解質蓄電デバイスの信頼性を高めることができる。 Even if the external lead terminal connected to the electrode end of the non-aqueous electrolyte electricity storage device is equipped with a heat dissipation part, heat generation is suppressed even if a large current flows through the external lead terminal, and the life of the non-aqueous electrolyte electricity storage device is Shortening of life can be prevented, and the reliability of the nonaqueous electrolyte electricity storage device can be improved.
＝＝＝非水電解質蓄電デバイスの構造＝＝＝
本発明が対象とする非水電解質蓄電デバイス（以下、蓄電素子）の一例として、図５に示した蓄電素子１ｄを多層積層した構造の蓄電素子を挙げる。図１に当該多層構造の蓄電素子の概略を示した。（Ａ）に示すように、金属箔などのシート状集電体１１ｐ上に活性炭をシート状に成形した正極１０ｐと、リチウムの吸蔵・放出が可能な炭素材料を主成分とする負極合剤をシート状集電体１１ｎ上に塗布してなる負極１０ｎをセパレータ３０を介して積層した構造を一層分の積層体１ａとし、その一層分の積層体１ａを多層積層した積層構造体５０を基本構造としている。なお、この例では、負極１０ｎ側のシート状集電体１１ｎ上で負極１０ｎが形成されていない余白にリチウム金属２０が貼着されて、このリチウム金属２０から同じシート状集電体１１ｎ上に形成された負極１０ｎにリチウムイオンを拡散する構成となっている。正極１０ｐと負極１０ｎが形成されるそれぞれのシート状集電体（１１ｐ，１１ｎ）には、電極部（１２ｐ，１２ｎ）となる突起が形成され、正極１０ｐと負極１０ｎは、それぞれの電極部（１２ｐ，１２ｎ）が互いに反対方向に突設されるように積層されている。そして、（Ｂ）に示すように、この積層状態にある電極部（１２ｐ，１２ｎ）に、外部リート端子４０が超音波溶接などによって接続される。そして、図５に示したように、外部リード端子４０の先端側を外部に露出させた状態で、積層構造体５０がラミネートフィルムの外装体内に密封されて多層構造の蓄電素子となる。本発明では、蓄電素子における外部リード端子４０の形状や構造を工夫することで、外部リード端子４０の発熱を防止し、蓄電素子の信頼性を向上させることができる。
=== Structure of non-aqueous electrolyte electricity storage device ===
As an example of a nonaqueous electrolyte electricity storage device (hereinafter, electricity storage element) targeted by the present invention, an electricity storage element having a structure in which the electricity storage elements 1d shown in FIG. FIG. 1 shows an outline of the power storage element having the multilayer structure. As shown in (A), a positive electrode 10p in which activated carbon is formed into a sheet shape on a sheet-shaped current collector 11p such as a metal foil, and a negative electrode mixture mainly composed of a carbon material capable of occluding and releasing lithium. A structure in which a negative electrode 10n applied on a sheet-like current collector 11n is laminated with a separator 30 interposed therebetween is used as a laminated body 1a, and a laminated structure 50 in which the laminated body 1a is laminated in multiple layers is a basic structure. It is said. In this example, lithium metal 20 is attached to the blank where the negative electrode 10n is not formed on the sheet-shaped current collector 11n on the negative electrode 10n side, and the lithium metal 20 is applied to the same sheet-shaped current collector 11n. Lithium ions are diffused into the formed negative electrode 10n. The respective sheet-like current collectors (11p, 11n) on which the positive electrode 10p and the negative electrode 10n are formed are formed with protrusions to be electrode portions (12p, 12n), and the positive electrode 10p and the negative electrode 10n are connected to the respective electrode portions ( 12p, 12n) are stacked so as to protrude in opposite directions. And as shown to (B), the external REIT terminal 40 is connected to the electrode part (12p, 12n) in this laminated state by ultrasonic welding or the like. Then, as shown in FIG. 5, the laminated structure 50 is sealed in the outer package of the laminate film in a state where the leading end side of the external lead terminal 40 is exposed to the outside, so that a multilayer storage element is obtained. In the present invention, by devising the shape and structure of the external lead terminal 40 in the power storage element, heat generation of the external lead terminal 40 can be prevented and the reliability of the power storage element can be improved.
＝＝＝第１の実施例＝＝＝
本発明の第１の実施例は、発生した熱を大気中に効率よく放出するヒートシンク方式を採用した蓄電素子である。当該方式において、効果的に熱を放出するためには、発熱箇所に金属などの熱伝導率が高い材質を使い、かつ、その箇所の形状を大気にさらされる面積が大きくなるような形状に形成することが必要となる。図２に第１の実施例に係る蓄電素子１ｂの概略図を示した。（Ａ）は、正極と負極の一方の電極側における外部リード端子４０ａの外観形状を示している。なお、この図では、外装体を省略している。図に示すように、外部リード端子６０ａには、その本体となる金属平板４１の表面に、放熱部６０ａが形成されている。
=== First Embodiment ===
The first embodiment of the present invention is a power storage element that employs a heat sink method that efficiently releases generated heat into the atmosphere. In this method, in order to effectively release heat, a material with high thermal conductivity such as metal is used for the heat generating portion, and the shape of the portion is formed so as to increase the area exposed to the atmosphere. It is necessary to do. FIG. 2 shows a schematic diagram of the electricity storage device 1b according to the first example. (A) has shown the external shape of the external lead terminal 40a in the one electrode side of a positive electrode and a negative electrode. In addition, the exterior body is abbreviate | omitted in this figure. As shown in the figure, the external lead terminal 60a has a heat radiating portion 60a formed on the surface of a metal flat plate 41 serving as a main body thereof.
（Ｂ）に当該放熱部６０ａの拡大図を示した。平板状の外部リード端子本体４１の表面に、放熱部６０ａとして、多数の柱状の突起６１が形成されている。この構成では、多数の突起６１のそれぞれの表面から熱を放出するようになっている。図示した例では、放熱部６０ａと外部リード端子本体４１とは個別に構成され、放熱部６０ａは、金属ブロックを切削加工するなどして平坦部６２状に突起６１が一体的に形成された形状をなしている。そして、平坦部６２の下面を外部リード端子本体となる金属平板４１に溶接している。もちろん、外部リード端子４０ａに突起６１を一体的に備えさせてもよい。なお、（Ｃ）は、第１の実施例の変更形態における蓄電素子の概略であり、当該変更形態における外部リード端子４０ｂの構造を示している。この例では、突起６１に変えて、多数の孔６３が穿設された金属ブロックを放熱部６０ｂとしている。この構成では、この孔６３の内壁面によって放熱面積を拡大させている。 The enlarged view of the said thermal radiation part 60a was shown to (B). A large number of columnar protrusions 61 are formed on the surface of the flat external lead terminal body 41 as the heat radiating portion 60a. In this configuration, heat is released from the respective surfaces of the multiple protrusions 61. In the illustrated example, the heat radiating portion 60a and the external lead terminal main body 41 are configured separately, and the heat radiating portion 60a has a shape in which protrusions 61 are integrally formed in a flat portion 62 shape by cutting a metal block or the like. I am doing. And the lower surface of the flat part 62 is welded to the metal flat plate 41 used as an external lead terminal main body. Of course, the protrusion 61 may be integrally provided on the external lead terminal 40a. In addition, (C) is the outline of the electrical storage element in the modification of the first example, and shows the structure of the external lead terminal 40b in the modification. In this example, instead of the protrusion 61, a metal block having a large number of holes 63 is used as the heat radiating portion 60b. In this configuration, the heat radiation area is enlarged by the inner wall surface of the hole 63.
＝＝＝第２の実施例＝＝＝
本発明の第２の実施例に係る蓄電素子は、第１の実施例におけるヒートシンク方式に対し、水冷（液冷）方式を採用している。図３に第２の実施例における蓄電素子の概略を示した。図２（Ａ）と同様に、図３（Ａ）では、外装体を省略し、正極と負極の一方の電極側の外部リード端子の外観形状を示している。この第２の実施例における蓄電素子１ｃでは、外部リード端子４０ｃに液体流路６４を備えた放熱部６０ｃが形成されている。（Ｂ）に当該放熱部６０ｃの拡大図を示した。この例において、放熱部６０ｃは、平板状の外部リード端子本体４１を横断する角柱形状をなす金属ブロックであり、その角柱状金属ブロックを縦貫するように穿設された孔を液体流路６４としている。そして、例えば、（Ｃ）に示すように、この放熱部６０ｃをポンプ６５が接続されている液体循環路６６に挿入し、その液体循環路６６の端部６７を液体流路６４の２つの開口に接続することで、放熱部６０ｃの一方の開口から導入された液体が熱を奪い、他方の開口から導出され、循環路６６中で液体が冷却され、その冷却された液体が再度放熱部６０ｃに導入されるのである。もちろん、循環路６６の途上に熱交換手段が挿入されていても良い。
=== Second Embodiment ===
The electricity storage device according to the second embodiment of the present invention adopts a water cooling (liquid cooling) method as compared with the heat sink method in the first embodiment. FIG. 3 shows an outline of the storage element in the second embodiment. As in FIG. 2A, in FIG. 3A, the exterior body is omitted, and the external shape of the external lead terminal on one electrode side of the positive electrode and the negative electrode is shown. In the electricity storage device 1c according to the second embodiment, the heat radiating portion 60c including the liquid flow path 64 is formed in the external lead terminal 40c. The enlarged view of the said thermal radiation part 60c was shown to (B). In this example, the heat radiating portion 60 c is a metal block having a rectangular column shape that crosses the flat plate-like external lead terminal body 41, and a hole drilled so as to pass through the rectangular columnar metal block is used as the liquid channel 64. Yes. Then, for example, as shown in (C), the heat radiating portion 60 c is inserted into the liquid circulation path 66 to which the pump 65 is connected, and the end 67 of the liquid circulation path 66 is connected to two openings of the liquid flow path 64. , The liquid introduced from one opening of the heat radiating part 60c takes heat, is led out from the other opening, the liquid is cooled in the circulation path 66, and the cooled liquid is again supplied to the heat radiating part 60c. It will be introduced to. Of course, heat exchange means may be inserted in the middle of the circulation path 66.
なお、この第２の実施例においても、放熱部６０ｃが一体的に形成された外部リード端子４０ｃとしてもよいし、放熱部６０ｃと外部リード端子本体４１とが別体であってもよい。図４に、放熱部６０ｃと外部リード端子本体４１とを別体とした場合の外部リード端子４０ｃの構造を液体流路６４の断面によって示した。（Ａ）（Ｂ）は、外部リード端子本体となる金属平板４１の上下から、両端に開口を有する中空角柱を縦に切断した形状の２つの金属ブロック（６８，６９）で挟持することで放熱部６０ｃを構成した例である。この場合、金属平板４１を、２つの金属ブロック（６８，６９）でそのまま挟持して金属平板４１が中空筒内を貫通するようにしてもよいし（Ａ）、金属平板を中空円筒の内壁面に沿って湾曲させてもよい（Ｂ）。 In the second embodiment as well, the external lead terminal 40c integrally formed with the heat radiating portion 60c may be used, or the heat radiating portion 60c and the external lead terminal main body 41 may be separate. In FIG. 4, the structure of the external lead terminal 40 c in the case where the heat radiating portion 60 c and the external lead terminal main body 41 are separated is shown by a cross section of the liquid channel 64. (A) and (B) radiate heat by sandwiching two hollow metal blocks (68, 69) in the shape of a vertically cut hollow prism having openings at both ends from the top and bottom of the metal flat plate 41 serving as the external lead terminal body. It is the example which comprised the part 60c. In this case, the metal flat plate 41 may be directly sandwiched between the two metal blocks (68, 69) so that the metal flat plate 41 penetrates through the hollow cylinder (A), or the metal flat plate may be used as the inner wall surface of the hollow cylinder. (B).
なお、第２の実施例では、導電性の冷却液を使うと漏電してしまう。そこで、導電性がある冷却液を用いる場合には、外部リード端子本体４１が冷却液にさらされない構成が必要となる。冷却液が接触する部分に絶縁膜を形成してもよいが、例えば、同図（Ｃ）に示す放熱部６０ｄのように、上下の金属ブロック（６８，６９）にそれぞれ個別に液体流路となる孔（６４ａ，６４ｂ）を穿設して２系統の液体流路（６４ａ，６４ｂ）を設け、冷却液が直接外部リード端子本体４１に触れない構成としてもよい。そして、２系統の液体流路（６４ａ，６４ｂ）を１本の液体循環路に合流させればよい。 In the second embodiment, if a conductive coolant is used, electric leakage occurs. Therefore, when a conductive coolant is used, a configuration in which the external lead terminal body 41 is not exposed to the coolant is required. An insulating film may be formed at the portion where the cooling liquid comes into contact. For example, as in the heat dissipating part 60d shown in FIG. The holes (64a, 64b) may be formed to provide two liquid flow paths (64a, 64b) so that the coolant does not directly touch the external lead terminal body 41. And what is necessary is just to join two liquid flow paths (64a, 64b) to one liquid circulation path.
もちろん、第２の実施例においては、（Ａ）（Ｂ）に示した放熱部６０ｃに２系統以上の液体流路を設けたり、（Ｃ）に示した放熱部６０ｄに３系統以上の液体流路を形成したりしてもよい。当然のことながら、放熱部（６０ｃ，６０ｄ）における液体流路の断面形状は円でなくてもよい。当然、外観形状も角柱に限るものではない。実施例１に示したように、表面積を増やすための突起や孔が表面に形成された外観形状とすることも可能である。液体流路自体も直線ではなく、例えば、葛折れ形状などでもよい。外部リード端子の表面に沿って液体が流れる形状であれば適宜な流路形状が考えられる。 Of course, in the second embodiment, two or more liquid flow paths are provided in the heat dissipating part 60c shown in (A) and (B), or three or more liquid flow paths are provided in the heat dissipating part 60d shown in (C). A road may be formed. As a matter of course, the cross-sectional shape of the liquid flow path in the heat radiating section (60c, 60d) may not be a circle. Of course, the external shape is not limited to a prism. As shown in Example 1, it is also possible to have an external shape in which protrusions and holes for increasing the surface area are formed on the surface. The liquid flow path itself is not a straight line, and may be, for example, a twisted shape. An appropriate flow path shape can be considered as long as the liquid flows along the surface of the external lead terminal.
＝＝＝比較実験＝＝＝
本発明の放熱部を備えた蓄電素子の放熱性能を確認するために、図２（Ａ）および（Ｂ）に示した突起による放熱部６０ａが形成された外部リード端子４０ａを取り付けた第１の実施例に係る蓄電素子（サンプル１）と、上記図２（Ａ）および（Ｂ）に示した放熱部６０ｃが形成された外部リード端子を取り付けた第２の実施例に係る蓄電素子（サンプル２）と、図５に示した従来の蓄電素子、すなわち、放熱部が形成されていない平板状の外部リード端子４０ｄを取り付けた蓄電素子（サンプル３）を作成し、各サンプルに対して高電流での充放電を行った。なお、各サンプルは、外部リード端子以外の構造は全て同じとしている。また、サンプル２については、液体流路に冷却水を通過させながら充放電を行った。そして、各サンプルの発熱状態を観察したところ、本発明に係る蓄電素子（サンプル１，２）は、従来の蓄電素子であるサンプル３と比較して低い温度を維持することができた。すなわち、本発明の有効性が確認できた。
=== Comparison experiment ===
In order to confirm the heat dissipation performance of the electricity storage device including the heat dissipation portion of the present invention, the first lead terminal 40a having the external lead terminal 40a formed with the heat dissipation portion 60a formed by the protrusions shown in FIGS. The electricity storage device (sample 1) according to the second embodiment to which the electricity storage device (sample 1) according to the example and the external lead terminal formed with the heat radiation portion 60c shown in FIGS. 2 (A) and 2 (B) are attached. ) And the conventional power storage element shown in FIG. 5, that is, a power storage element (sample 3) to which a flat external lead terminal 40d without a heat radiating portion is attached is prepared. Was charged and discharged. Each sample has the same structure except for the external lead terminals. Sample 2 was charged and discharged while passing cooling water through the liquid channel. And when the heat-generation state of each sample was observed, the electrical storage element (samples 1 and 2) which concerns on this invention was able to maintain low temperature compared with the sample 3 which is a conventional electrical storage element. That is, the effectiveness of the present invention was confirmed.
＝＝＝本発明の適用範囲＝＝＝
上記実施例における蓄電素子は、正負の電極間にセパレータを介在させた電極体が、シート状の正極と負極をセパレータを介して積層させた構造で、さらに、一組の正負極からなる積層体を多数積層した構造であった。本発明に係る蓄電素子は、このような多層構造に限らず、一層の積層体からなる蓄電素子であってもよい。また、シート状の正極と負極とをセパレータを介して対向配置した積層体を巻回した構造の電極体を備えた蓄電素子であってもよい。すなわち、電極体に外部リード端子を取り付けた状態で使用される蓄電素子であれば、本発明の対象となり得る。
=== Applicability of the present invention ===
The electricity storage device in the above embodiment has a structure in which an electrode body in which a separator is interposed between positive and negative electrodes is formed by laminating a sheet-like positive electrode and a negative electrode with a separator interposed therebetween, and a laminated body including a pair of positive and negative electrodes It was the structure which laminated | stacked many. The electricity storage device according to the present invention is not limited to such a multilayer structure, and may be an electricity storage device comprising a single layered product. Moreover, the electrical storage element provided with the electrode body of the structure which wound the laminated body which arrange | positioned the sheet-like positive electrode and the negative electrode through the separator. That is, any power storage element that is used with the external lead terminal attached to the electrode body can be the subject of the present invention.
１ａ、積層体
１ｂ、１ｃ、１ｄ 非水電解質蓄電デバイス
１０ｐ 正極
１０ｎ 負極
１２ｐ、１２ｎ 外部電極部
３０ セパレータ
４０、４０ａ〜４０ｄ 外部リード端子
５０ 積層構造体
６０ａ〜６０ｄ 放熱部
６１ 柱状突起
６３ 放熱孔
６４ 液体流路
1a, laminated body 1b, 1c, 1d non-aqueous electrolyte electricity storage device 10p positive electrode 10n negative electrode 12p, 12n external electrode part 30 separator 40, 40a-40d external lead terminal 50 laminated structure 60a-60d heat radiating part 61 columnar protrusion 63 heat radiating hole 64 Liquid flow path
Claims (4)
前記電極体における正負それぞれの電極端部に、金属プレートからなる外部リード端子が接続され、当該外部リード端子には、放熱部が形成されている
ことを特徴とする非水電解質蓄電デバイス。 A non-aqueous electrolyte in which an electrode body in which a positive electrode made of a carbon material and a negative electrode made of a material capable of occluding and releasing lithium are opposed to each other via a separator is sealed together with an electrolytic solution using a lithium salt as a supporting electrolyte An electricity storage device,
An external lead terminal made of a metal plate is connected to positive and negative electrode ends of the electrode body, and a heat radiating part is formed on the external lead terminal.
Priority Applications (1)
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| JP2008013465A JP2009176917A (en) | 2008-01-24 | 2008-01-24 | Nonaqueous electrolyte storage battery device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008013465A JP2009176917A (en) | 2008-01-24 | 2008-01-24 | Nonaqueous electrolyte storage battery device |
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| JP2009176917A true JP2009176917A (en) | 2009-08-06 |
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| JP2008013465A Pending JP2009176917A (en) | 2008-01-24 | 2008-01-24 | Nonaqueous electrolyte storage battery device |
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| EP2602859A4 (en) * | 2010-12-20 | 2016-09-07 | Lg Chemical Ltd | Method and system for cooling lithium secondary batteries |
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| JP2012059361A (en) * | 2010-09-03 | 2012-03-22 | Mitsubishi Heavy Ind Ltd | Battery |
| EP2602859A4 (en) * | 2010-12-20 | 2016-09-07 | Lg Chemical Ltd | Method and system for cooling lithium secondary batteries |
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