JP5382079B2 - Secondary battery - Google Patents
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- JP5382079B2 JP5382079B2 JP2011185050A JP2011185050A JP5382079B2 JP 5382079 B2 JP5382079 B2 JP 5382079B2 JP 2011185050 A JP2011185050 A JP 2011185050A JP 2011185050 A JP2011185050 A JP 2011185050A JP 5382079 B2 JP5382079 B2 JP 5382079B2
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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
- 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
Description
本発明は、二次電池に関する。 The present invention relates to a secondary battery.
外装部材から外部に導出される電極を有する扁平型電池を複数積層し、電気的に直列および／または並列に接続することによって、高出力および／または高容量の電池モジュールを得ている。 A plurality of flat batteries having electrodes led out from the exterior member are stacked and electrically connected in series and / or in parallel to obtain a high output and / or high capacity battery module.
上記の扁平型電池には、例えば、非水電解質二次電池が使用される。非水電解質二次電池は、積層電極体を外装部材内に非水系の電解液とともに収納した電池である。積層電極体は、正極と、負極と、両極の短絡を防止するセパレータとを有する。外装部材として、例えばアルミラミネートシートが使用される。アルミラミネートシートの外周部を溶着することによって、積層電極体を収納する電池容器を構成している。 For example, a non-aqueous electrolyte secondary battery is used as the flat battery. A non-aqueous electrolyte secondary battery is a battery in which a laminated electrode body is housed in an exterior member together with a non-aqueous electrolyte solution. The laminated electrode body includes a positive electrode, a negative electrode, and a separator that prevents a short circuit between the two electrodes. For example, an aluminum laminate sheet is used as the exterior member. The battery container which accommodates a laminated electrode body is comprised by welding the outer peripheral part of an aluminum laminate sheet.
この種の二次電池において、積層電極体におけるずれの発生を防止するために、セパレータの外周部をアルミラミネートシートの溶着封口とともに溶着する技術が知られている（特許文献１を参照）。 In this type of secondary battery, a technique is known in which the outer peripheral portion of the separator is welded together with a welded seal of an aluminum laminate sheet in order to prevent the occurrence of displacement in the laminated electrode body (see Patent Document 1).
ところで、電池性能を維持するためには、積層電極体が所定の量の電解液を含んでいることが重要である。このため、何らかの原因によって積層電極体における電解液の量が不足する事態に至った場合には、電解液が積層電極体に対して補充されることが好ましい。 By the way, in order to maintain battery performance, it is important that the laminated electrode body contains a predetermined amount of electrolytic solution. For this reason, when the situation which the quantity of the electrolyte solution in a laminated electrode body runs short for some reason, it is preferable that an electrolyte solution is replenished with respect to a laminated electrode body.
しかしながら、特許文献１の非水電解質二次電池は、セパレータの外周部を外装部材とともに接合する構造に関して、電解液を積層電極体に対して補充する観点からの考察がなされておらず、長期にわたる使用によって電池性能が低下する虞がある。 However, the nonaqueous electrolyte secondary battery of Patent Document 1 has not been considered from the viewpoint of replenishing the electrolyte solution to the laminated electrode body with respect to the structure in which the outer peripheral portion of the separator is joined together with the exterior member. There is a possibility that the battery performance is lowered by use.
本発明は、上記従来技術に伴う課題を解決するためになされたものであり、セパレータの外周部を外装部材とともに接合する構造を、電解液を積層電極体に対して補充し得る構造とし、もって、長期にわたる使用によっても電池性能の維持を図り得る二次電池を提供することを目的とする。 The present invention has been made in order to solve the problems associated with the prior art described above, and has a structure in which the outer peripheral portion of the separator is joined together with the exterior member so that the electrolytic solution can be replenished to the laminated electrode body. Another object of the present invention is to provide a secondary battery that can maintain battery performance even when used for a long time.
上記目的を達成するための本発明は、正極と負極とセパレータとを有する積層電極体を外装部材内に電解液とともに収納した二次電池であって、前記セパレータの外周部を前記外装部材とともに接合した複数の接合部を有している。そして、少なくとも前記接合部同士の間に、前記電解液を保持した保持部を形成する。 The present invention for achieving the above object is a secondary battery in which a laminated electrode body having a positive electrode, a negative electrode, and a separator is housed together with an electrolyte in an exterior member, and the outer peripheral portion of the separator is joined together with the exterior member. A plurality of joints. And the holding | maintenance part holding the said electrolyte solution is formed at least between the said junction parts.
本発明によれば、セパレータの外周部を外装部材とともに接合する構造において、連続した単一の接合部によって接合するのではなく、複数の接合部を有し、少なくとも接合部同士の間に、電解液を保持した保持部を形成してある。このため、接合部同士の間の保持部から、電解液を積層電極体に対して補充することができ、もって、長期にわたる使用によっても電池性能の維持を図り得る二次電池を提供することが可能となる。 According to the present invention, in the structure in which the outer peripheral portion of the separator is joined together with the exterior member, the separator is not joined by a single continuous joint, but has a plurality of joints, and at least between the joints, A holding part for holding the liquid is formed. Therefore, it is possible to provide a secondary battery that can replenish electrolyte solution to the laminated electrode body from the holding part between the joining parts, and can maintain the battery performance even when used for a long time. It becomes possible.
以下、添付した図面を参照しながら、本発明の実施形態を説明する。なお、図面の説明において同一の要素には同一の符号を付し、重複する説明を省略する。図面の寸法比率は、説明の都合上誇張されており、実際の比率とは異なる。図面に付されたＸ軸およびＹ軸はそれぞれ、扁平型電池１０の短手方向および長手方向を示している。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. The dimensional ratios in the drawings are exaggerated for convenience of explanation, and are different from the actual ratios. An X axis and a Y axis attached to the drawings indicate a short side direction and a long side direction of the flat battery 10, respectively.
図１および図２を参照して、電池モジュール１００は、ケース１２０の内部に、複数の扁平型電池１０（二次電池に相当する）を含むセルユニット１３０と、電気絶縁性を備えた絶縁カバー１４０とを収納している。電池モジュール１００は、単独で使用することが可能であるが、例えば、複数の電池モジュール１００を直列化および／または並列化することによって、所望の電流、電圧、容量に対応した組電池を形成することができる。 Referring to FIGS. 1 and 2, a battery module 100 includes a cell unit 130 including a plurality of flat batteries 10 (corresponding to secondary batteries) inside a case 120, and an insulating cover having electrical insulation. 140 is housed. The battery module 100 can be used alone. For example, by forming a plurality of battery modules 100 in series and / or in parallel, an assembled battery corresponding to a desired current, voltage, and capacity is formed. be able to.
ケース１２０は、略矩形の箱形状をなすロアケース１２２と、蓋体をなすアッパーケース１２４とを有する。アッパーケース１２４の縁部は、カシメ加工によって、ロアケース１２２の周壁の縁部に巻き締められている。ロアケース１２２およびアッパーケース１２４は、比較的薄肉の鋼板またはアルミ板から形成している。ロアケース１２２およびアッパーケース１２４は貫通孔１２６を有する。貫通孔１２６は、隅部の４箇所に配置されており、電池モジュール１００同士を複数積み重ねて組み電池として保持するための通しボルト（図示せず）を挿通するために使用される。符号１３１、１３２は、ロアケース１２２の前面の開口部から突出するように配置された出力端子である。 The case 120 includes a lower case 122 having a substantially rectangular box shape and an upper case 124 forming a lid. The edge of the upper case 124 is wound around the edge of the peripheral wall of the lower case 122 by caulking. The lower case 122 and the upper case 124 are formed from a relatively thin steel plate or aluminum plate. The lower case 122 and the upper case 124 have a through hole 126. The through holes 126 are arranged at four corners, and are used to insert through bolts (not shown) for stacking a plurality of battery modules 100 and holding them as an assembled battery. Reference numerals 131 and 132 are output terminals arranged so as to protrude from the opening on the front surface of the lower case 122.
図２を参照して、セルユニット１３０は、複数の扁平型電池１０が電気的に接続されて積層された積層体１３２、および、電池を支持するための複数のスペーサ１６０、１６１を有する。スペーサ１６０、１６１は、電気絶縁性を有する。スペーサ１６０は積層体１３２の前面側に配置され、スペーサ１６１（支持部材に相当する）は積層体１３２の背面側に配置される。 Referring to FIG. 2, cell unit 130 includes a stacked body 132 in which a plurality of flat batteries 10 are electrically connected and stacked, and a plurality of spacers 160 and 161 for supporting the batteries. The spacers 160 and 161 are electrically insulating. The spacer 160 is disposed on the front side of the stacked body 132, and the spacer 161 (corresponding to a support member) is disposed on the back side of the stacked body 132.
図３を参照して、例えば、積層体１３２の背面側に配置されるスペーサ１６１は、外装部材３０における外周部３２を挟持するよう位置決めされている。スペーサ１６１は、長手方向両端部に貫通孔１６２を有する。貫通孔１６２は、ロアケース１２２およびアッパーケース１２４の背面側の貫通孔１２６と位置合わせされている。 With reference to FIG. 3, for example, the spacer 161 disposed on the back side of the stacked body 132 is positioned so as to sandwich the outer peripheral portion 32 of the exterior member 30. The spacer 161 has through holes 162 at both ends in the longitudinal direction. The through hole 162 is aligned with the through hole 126 on the back side of the lower case 122 and the upper case 124.
図４〜図６を参照して、扁平型電池１０は、例えば、リチウムイオン二次電池であり、積層電極体２０を外装部材３０内に電解液とともに収納してある。扁平型電池１０は、外装部材３０から外部に導出される電極（以下、「タブ」という）４１、４２を有する。なお、図５において符号２１は正極または負極を示し、図６においては簡略化のためにセパレータ２２のみを示してある。 4 to 6, the flat battery 10 is, for example, a lithium ion secondary battery, and the laminated electrode body 20 is accommodated in the exterior member 30 together with the electrolytic solution. The flat battery 10 includes electrodes (hereinafter referred to as “tabs”) 41 and 42 led out from the exterior member 30 to the outside. In FIG. 5, reference numeral 21 denotes a positive electrode or a negative electrode, and in FIG. 6, only the separator 22 is shown for simplification.
積層電極体２０は、正極、負極およびセパレータ２２を順に積層して形成される。正極は、例えば、ＬｉＭｎ2Ｏ4等のリチウム−遷移金属複合酸化物からなる正極活物質層を有する。負極は、例えば、カーボンおよびリチウム−遷移金属複合酸化物からなる負極活物質層を有する。セパレータ２２は、例えば、電解質を浸透し得る通気性を有するポーラス状のＰＥ（ポリエチレン）から形成される。 The laminated electrode body 20 is formed by sequentially laminating a positive electrode, a negative electrode, and a separator 22. The positive electrode has, for example, a positive electrode active material layer made of a lithium-transition metal composite oxide such as LiMn 2 O 4 . The negative electrode has, for example, a negative electrode active material layer made of carbon and a lithium-transition metal composite oxide. The separator 22 is formed of, for example, porous PE (polyethylene) having air permeability that can penetrate the electrolyte.
外装部材３０は、軽量化および熱伝導性の観点から、アルミニウム、ステンレス、ニッケル、銅などの金属（合金を含む）をポリプロピレンフィルム等の絶縁体で被覆した高分子−金属複合ラミネートフィルムなどのシート材からなる。外装部材３０は、積層電極体２０を覆う本体部３１と、本体部３１の周縁に伸びる外周部３２とを有している。外周部３２の一部または全部が、熱融着により接合されている。 The exterior member 30 is a sheet such as a polymer-metal composite laminate film in which a metal (including an alloy) such as aluminum, stainless steel, nickel, or copper is covered with an insulator such as a polypropylene film from the viewpoint of weight reduction and thermal conductivity. Made of material. The exterior member 30 has a main body portion 31 that covers the laminated electrode body 20 and an outer peripheral portion 32 that extends to the periphery of the main body portion 31. A part or all of the outer peripheral portion 32 is joined by thermal fusion.
タブ４１および４２は、積層電極体２０から電流を引き出すための部材であり、扁平型電池１０の前面側に延長している。 The tabs 41 and 42 are members for drawing current from the laminated electrode body 20 and extend to the front side of the flat battery 10.
扁平型電池１０は、積層電極体２０におけるずれの発生を防止するために、セパレータ２２の外周部を外装部材３０とともに接合した複数の接合部４０を有している。そして、少なくとも接合部４０同士の間に、電解液を積層電極体２０に対して補充自在に保持した保持部５０を形成してある。接合は、熱溶着や超音波溶着、溶接を適用することができる。図５においては、理解の容易のために、接合部４０にはハッチングを付してある。 The flat battery 10 has a plurality of joint portions 40 in which the outer peripheral portion of the separator 22 is joined together with the exterior member 30 in order to prevent occurrence of displacement in the laminated electrode body 20. A holding portion 50 that holds the electrolytic solution so as to be replenishable with respect to the laminated electrode body 20 is formed at least between the joint portions 40. For joining, heat welding, ultrasonic welding, or welding can be applied. In FIG. 5, the joint 40 is hatched for easy understanding.
さらに詳しくは、図５および図６（Ａ）（Ｂ）に示すように、セパレータ２２の外周部を外装部材３０とともに接合する構造において、連続した単一の接合部で接合するのではなく、分けて接合することによって、複数（図示例では３個）の接合部４０を有するようにしてある。なお、説明の便宜上、「連続した単一の接合部」を、単に、「連続接合部」ともいう。 More specifically, as shown in FIGS. 5 and 6A and 6B, in the structure in which the outer peripheral portion of the separator 22 is joined together with the exterior member 30, it is not joined by a single continuous joint, but divided. Are joined together so as to have a plurality (three in the illustrated example) of joints 40. For convenience of explanation, the “continuous single joint” is also simply referred to as “continuous joint”.
接合部４０の寸法例の一例を挙げれば、図５を参照して、Ｗ１（幅）＝１０ｍｍ、Ｗ２（隙間間隔）＝２０ｍｍ、Ｗ３（奥行き）＝２ｍｍである。また、Ｗ４（セパレータ２２の外周部と外装部材３０との溶着部（接合部４０）から外装部材３０における外周部３２同士の溶着部までの隙間）＝５ｍｍである。セパレータ２２の全面積に対する接合部４０の全面積の比率は、特に限定されるものではないが、例えば、０．１％〜１％である。 If an example of the dimension example of the junction part 40 is given, with reference to FIG. 5, W1 (width) = 10 mm, W2 (gap interval) = 20 mm, and W3 (depth) = 2 mm. Further, W4 (the gap from the welded portion (joint portion 40) between the outer peripheral portion of the separator 22 and the exterior member 30 to the welded portion between the outer peripheral portions 32 of the exterior member 30) = 5 mm. The ratio of the total area of the joint portion 40 to the total area of the separator 22 is not particularly limited, and is, for example, 0.1% to 1%.
連続接合部で接合した場合には、連続接合部から、外装部材における外周部同士の溶着部までの間の隙間領域に、溜まった電解液を閉じ込めてしまういわゆる袋構造となる。かかる形態の場合には、閉じ込めた電解液を有効活用できなくなってしまう。 In the case of joining at the continuous joining portion, a so-called bag structure is formed in which the accumulated electrolyte is confined in a gap region between the continuous joining portion and the welded portion between the outer peripheral portions of the exterior member. In such a case, the confined electrolytic solution cannot be effectively used.
これに対して本実施形態のように複数の接合部４０を有するように接合した場合には、少なくとも接合部４０同士の間の領域では、セパレータ２２同士が溶着されていないので、セパレータ２２間の微小隙間に電解液５１を保持させた保持部５０を形成することができる（図６を参照）。そして、何らかの原因によって積層電極体２０における電解液５１の量が不足する事態に至った場合には、保持部５０から、毛細管現象によって、電解液５１を積層電極体２０に対して補充することができる。このような積層電極体２０に対する電解液５１の補充によって、積層電極体２０が所定の量の電解液５１を含んだ状態を長期にわたって維持でき、長期にわたる使用によっても電池性能の維持を図り得る扁平型電池１０を提供することができる。 On the other hand, when it joins so that it may have a plurality of joined parts 40 like this embodiment, since separators 22 are not welded at least in the field between joined parts 40, between separators 22 The holding part 50 which hold | maintained the electrolyte solution 51 in the micro clearance gap can be formed (refer FIG. 6). And when it comes to the situation where the quantity of the electrolyte solution 51 in the laminated electrode body 20 runs short for some reason, the electrolyte solution 51 can be replenished with respect to the laminated electrode body 20 from the holding | maintenance part 50 by a capillary phenomenon. it can. By replenishing the electrolyte solution 51 to the multilayer electrode body 20 as described above, a state in which the multilayer electrode body 20 includes a predetermined amount of the electrolyte solution 51 can be maintained for a long time, and the battery performance can be maintained even when used for a long time. A type battery 10 can be provided.
また、電池の生産工程において積層電極の間に溜まったガスを、発電に寄与する領域から、接合部４０同士の間の領域Ｓ１を通して、外周部３２に逃がし易くなる。これによって、ガスによる発電効率の低下を抑えることができる。 Further, the gas accumulated between the stacked electrodes in the battery production process can easily escape from the region contributing to power generation to the outer peripheral portion 32 through the region S1 between the joint portions 40. As a result, a decrease in power generation efficiency due to gas can be suppressed.
図５を参照して、図示例では、接合部４０同士の間の領域Ｓ１のみならず、３個の接合部４０のうち図中最上位の接合部４０と外装部材３０との間の隙間領域Ｓ２、図中最下位の接合部４０と外装部材３０との間の隙間領域Ｓ３、および、３個の接合部４０と背面側（図中右手側）に位置する外装部材３０との間の隙間領域Ｓ４も、保持部５０としての機能を発揮する。したがって、より多くの電解液５１を積層電極体２０に対して補充自在に保持することができ、より一層長期にわたって電池性能の維持を図ることができる。 With reference to FIG. 5, in the illustrated example, not only the region S <b> 1 between the joint portions 40 but also the gap region between the uppermost joint portion 40 in the drawing and the exterior member 30 among the three joint portions 40. S2, a gap region S3 between the lowest joint 40 in the figure and the exterior member 30, and a gap between the three joints 40 and the exterior member 30 located on the back side (right hand side in the figure) The region S4 also functions as the holding unit 50. Therefore, more electrolytic solution 51 can be replenished with respect to the laminated electrode body 20, and the battery performance can be maintained for a longer period.
図３〜図５を参照して、外装部材３０における外周部３２は、電池を支持するためのスペーサ１６１に接着剤により接続される複数の支持部３３と、支持部３３同士の間に配置され電池の外方に向けて伸びる延長部３４と、を含んでいる。また、セパレータ２２の外周部は、外装部材３０の延長部３４に向けて伸びるとともに接合部４０が形成される舌部２３を含んでいる。かかる構成によって、スペーサ１６１によって支持されて発電に実質的に寄与しないデッドスペースを有効に活用して、電解液５１の保持容量を増やすことができ、電池の高寿命化を図ることができる。 3 to 5, the outer peripheral portion 32 of the exterior member 30 is disposed between a plurality of support portions 33 connected to a spacer 161 for supporting a battery by an adhesive and the support portions 33. And an extension 34 extending outward of the battery. Further, the outer peripheral portion of the separator 22 includes a tongue portion 23 that extends toward the extension portion 34 of the exterior member 30 and is formed with a joint portion 40. With such a configuration, the dead space supported by the spacer 161 and not substantially contributing to power generation can be effectively used to increase the retention capacity of the electrolyte 51 and to increase the life of the battery.
延長部３４には、スペーサ１６１に設けたピンが挿通される貫通孔３５が形成されている。ピンを貫通孔３５に挿通させることによって、スペーサ１６１に対する扁平型電池１０の支持位置を規制することができる。 The extension 34 is formed with a through hole 35 through which a pin provided in the spacer 161 is inserted. By inserting the pin through the through hole 35, the support position of the flat battery 10 with respect to the spacer 161 can be regulated.
以上説明したように、本実施形態の扁平型電池１０は、セパレータ２２の外周部を外装部材３０とともに接合した複数の接合部４０と、少なくとも接合部４０同士の間に形成され電解液５１を積層電極体２０に対して補充自在に保持した保持部５０と、を有するので、接合部４０同士の間の保持部５０から、電解液５１を積層電極体２０に対して補充することができ、積層電極体２０が所定の量の電解液５１を含んだ状態を長期にわたって維持できる。もって、長期にわたる使用によっても電池性能の維持を図り得る二次電池を提供することが可能となる。また、積層電極の間に溜まったガスを、接合部４０同士の間の領域を通して外周部３２に逃がし易くなり、ガスによる発電効率の低下を抑えることができる。 As described above, the flat battery 10 of the present embodiment is formed by laminating the electrolytic solution 51 formed between the plurality of joint portions 40 obtained by joining the outer peripheral portion of the separator 22 together with the exterior member 30 and at least the joint portions 40. And the holding part 50 that can be replenished with respect to the electrode body 20. Therefore, the electrolytic solution 51 can be replenished to the laminated electrode body 20 from the holding part 50 between the joint parts 40. The state in which the electrode body 20 includes a predetermined amount of the electrolytic solution 51 can be maintained over a long period of time. Accordingly, it is possible to provide a secondary battery that can maintain battery performance even when used for a long period of time. In addition, the gas accumulated between the stacked electrodes can be easily released to the outer peripheral portion 32 through the region between the joint portions 40, and the reduction in power generation efficiency due to the gas can be suppressed.
外装部材３０における外周部３２は、電池を支持するためのスペーサ１６１に接続される複数の支持部３３と、支持部３３同士の間に配置され電池の外方に向けて伸びる延長部３４と、を含み、セパレータ２２の外周部は、外装部材３０の延長部３４に向けて伸びるとともに接合部４０が形成される舌部２３を含んでいるので、スペーサ１６１によって支持されて発電に実質的に寄与しないデッドスペースを有効に活用して、電解液５１の保持容量を増やすことができ、電池の高寿命化を図ることができる。 The outer peripheral portion 32 of the exterior member 30 includes a plurality of support portions 33 connected to the spacers 161 for supporting the battery, an extension portion 34 that is disposed between the support portions 33 and extends toward the outside of the battery, And the outer peripheral portion of the separator 22 extends toward the extension portion 34 of the exterior member 30 and includes the tongue portion 23 where the joint portion 40 is formed, so that it is supported by the spacer 161 and substantially contributes to power generation. By effectively utilizing the dead space that is not used, the retention capacity of the electrolyte 51 can be increased, and the life of the battery can be increased.
（改変例）
本発明は、上述した実施形態に限定されるものではなく、適宜改変することができる。例えば、外装部材３０の一の辺に正負のタブ４１、４２の両方が配置される扁平型電池１０を示したが、正負のタブを異なる辺に配置した二次電池に適用できることは言うまでもない。また、タブが配置される辺に保持部５０を設けてもよい。
(Modification example)
The present invention is not limited to the above-described embodiment, and can be modified as appropriate. For example, although the flat battery 10 in which both the positive and negative tabs 41 and 42 are arranged on one side of the exterior member 30 is shown, it goes without saying that the present invention can be applied to a secondary battery in which positive and negative tabs are arranged on different sides. Moreover, you may provide the holding | maintenance part 50 in the edge | side where a tab is arrange | positioned.
１０ 扁平型電池（二次電池）、
２０ 積層電極体、
２１ 正極または負極、
２２ セパレータ、
２３ 舌部、
３０ 外装部材、
３１ 本体部、
３２ 外周部、
３３ 支持部、
３４ 延長部、
４０ 接合部、
５０ 保持部、
５１ 電解液、
１００ 電池モジュール、
１６１ スペーサ（支持部材）。
10 Flat battery (secondary battery),
20 laminated electrode body,
21 positive or negative electrode,
22 separator,
23 Tongue,
30 exterior member,
31 body,
32 outer periphery,
33 support part,
34 Extension,
40 joints,
50 holding part,
51 electrolyte,
100 battery module,
161 Spacer (support member).
Claims (2)
前記セパレータの外周部を前記外装部材とともに接合した複数の接合部と、
少なくとも前記接合部同士の間に形成され前記電解液を保持した保持部と、を有する二次電池。 A secondary battery in which a laminated electrode body having a positive electrode, a negative electrode, and a separator is housed together with an electrolyte in an exterior member,
A plurality of joints joining the outer periphery of the separator together with the exterior member;
A secondary battery comprising at least a holding part that is formed between the joints and holds the electrolytic solution.
前記セパレータの外周部は、前記外装部材の前記延長部に向けて伸びているとともに前記接合部が形成される舌部を含んでいる請求項１に記載の二次電池。 The outer peripheral portion of the outer member includes a plurality of support portions which are connected to the support member for supporting the battery, and a Tei Ru extension extending outward of arranged battery between between the supporting part Including
The outer peripheral portion, the secondary battery according to claim 1 including the tongue Tei Rutotomoni the joint portion extending toward the extended portion of the outer member is formed of the separator.
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