JP5691959B2 - Secondary battery electrode assembly, secondary battery and vehicle - Google Patents

Secondary battery electrode assembly, secondary battery and vehicle Download PDF

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JP5691959B2
JP5691959B2 JP2011199748A JP2011199748A JP5691959B2 JP 5691959 B2 JP5691959 B2 JP 5691959B2 JP 2011199748 A JP2011199748 A JP 2011199748A JP 2011199748 A JP2011199748 A JP 2011199748A JP 5691959 B2 JP5691959 B2 JP 5691959B2
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厚志 南形
厚志 南形
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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
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    • Y02E60/10—Energy storage using batteries
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Description

本発明は、二次電池用電極組立体及び二次電池並びに車両に関する。   The present invention relates to an electrode assembly for a secondary battery, a secondary battery, and a vehicle.

二次電池は再充電が可能であり、繰り返し使用することができるため電源として広く利用されている。近年、化石燃料の使用削減（二酸化炭素排出規制）が求められており、電気自動車やハイブリッド車等の主電源や補助電源に使用される二次電池では、大電流での充電及び放電や二次電池の大容量化が要求されるようになっている。   Secondary batteries are widely used as a power source because they can be recharged and used repeatedly. In recent years, there has been a demand for reduction in the use of fossil fuels (restriction of carbon dioxide emissions). Secondary batteries used for main and auxiliary power sources such as electric vehicles and hybrid vehicles are charged and discharged with large currents and secondary batteries. Increased capacity of batteries is required.

リチウムイオン二次電池では、電極として金属箔製の集電体に活物質を塗布（担持）したものが使用されている。そして、正極用の集電体と負極用の集電体との間に帯状のセパレータを挟んだ積層状態で略長円柱状に巻いて発電要素（電極組立体）が構成され、その発電要素が電解液と共に電池ケースに収容された二次電池がある（例えば、特許文献１参照）。   In a lithium ion secondary battery, an electrode obtained by applying (supporting) an active material to a current collector made of metal foil is used as an electrode. Then, a power generation element (electrode assembly) is configured by winding in a substantially long cylindrical shape with a strip-shaped separator sandwiched between a current collector for the positive electrode and a current collector for the negative electrode, and the power generation element There is a secondary battery housed in a battery case together with an electrolytic solution (see, for example, Patent Document 1).

特許文献１の二次電池では正極と負極の短絡を防止するため、図８（ａ）に示すように、発電要素５１の上端部に負極集電体５２を配置して負極５１ａの集電を行っていた。負極集電体５２は蛇腹状の挟持部５２ａを有し、図８（ｂ）に示すように、各挟持部５２ａの隙間に負極５１ａの端縁部が複数枚ずつまとめて挟み込まれて、かしめ及び溶接で固定されている。負極集電体５２は負極端子５３を有する。また、発電要素５１の下端部に正極集電体（図示せず）が配置され、同様に構成された正極集電体の挟持部の隙間に、正極５１ｂの端縁部が複数枚ずつまとめて挟み込まれて、かしめ及び溶接で固定されている。   In the secondary battery of Patent Document 1, in order to prevent a short circuit between the positive electrode and the negative electrode, as shown in FIG. 8A, a negative electrode current collector 52 is disposed at the upper end of the power generation element 51 to collect the current of the negative electrode 51a. I was going. The negative electrode current collector 52 has a bellows-like sandwiching portion 52a. As shown in FIG. 8 (b), a plurality of edge portions of the negative electrode 51a are sandwiched between the sandwiching portions 52a and caulked. And it is fixed by welding. The negative electrode current collector 52 has a negative electrode terminal 53. In addition, a positive electrode current collector (not shown) is disposed at the lower end of the power generation element 51, and a plurality of edge portions of the positive electrode 51b are gathered together in the gap between the sandwiching portions of the positive electrode current collector having the same configuration. It is sandwiched and fixed by caulking and welding.

また、積層厚さが均一で、容量が増加する電極組立体及びこれを有する二次電池が提案されている（特許文献２参照）。図９に示すように、特許文献２に記載の電極組立体６０は、正極活物質６１ａが塗布された正極板６１と、負極活物質６２ａが塗布された負極板６２と、正極板６１と負極板６２の間に介在されたセパレータ６３とを含む。正極タブ６１ｂは正極板６１の正極活物質６１ａが塗布されていない部分に付着され、負極タブ６２ｂは負極板６２の負極活物質６２ａが塗布されていない部分に付着されている。正極板６１には負極タブ６２ｂと対応する位置に正極切開部６１ｃが形成され、負極板６２には正極タブ６１ｂと対応する位置に負極切開部６２ｃが形成されている。   In addition, an electrode assembly having a uniform lamination thickness and an increased capacity and a secondary battery having the same have been proposed (see Patent Document 2). As shown in FIG. 9, the electrode assembly 60 described in Patent Document 2 includes a positive electrode plate 61 coated with a positive electrode active material 61a, a negative electrode plate 62 coated with a negative electrode active material 62a, a positive electrode plate 61, and a negative electrode. And a separator 63 interposed between the plates 62. The positive electrode tab 61b is attached to a portion of the positive electrode plate 61 where the positive electrode active material 61a is not applied, and the negative electrode tab 62b is attached to a portion of the negative electrode plate 62 where the negative electrode active material 62a is not applied. A positive electrode incision 61c is formed in the positive electrode plate 61 at a position corresponding to the negative electrode tab 62b, and a negative electrode incision 62c is formed in the negative electrode plate 62 at a position corresponding to the positive electrode tab 61b.

特許第４０９９６０９号公報Japanese Patent No. 4099609 特開２０１１−７７０２５号公報JP 2011-77025 A

特許文献１の構成では、負極集電体５２及び正極集電体の構造が複雑で、隣り合う挟持部５２ａの間や負極端子５３の近傍に利用されない空間（デッドスペース）が存在する状態となり、その分、二次電池のエネルギ密度が低くなる。特許文献２の構成では、特許文献１の構成に比べて二次電池のエネルギ密度は高くなる。しかし、各正極板６１及び各負極板６２に正極タブ６１ｂ及び負極タブ６２ｂを付着する作業が必要になる。そして、実際の二次電池では正極板６１及び負極板６２の数は数十枚となるため、正極タブ６１ｂ及び負極タブ６２ｂの付着に手間が掛かる。   In the configuration of Patent Document 1, the structures of the negative electrode current collector 52 and the positive electrode current collector are complicated, and there is a space (dead space) that is not used between adjacent sandwiching portions 52a or in the vicinity of the negative electrode terminal 53. Accordingly, the energy density of the secondary battery is lowered. In the configuration of Patent Document 2, the energy density of the secondary battery is higher than that of Patent Document 1. However, it is necessary to attach the positive electrode tab 61b and the negative electrode tab 62b to each positive electrode plate 61 and each negative electrode plate 62. In an actual secondary battery, the number of the positive electrode plates 61 and the negative electrode plates 62 is several tens. Therefore, it takes time to attach the positive electrode tabs 61b and the negative electrode tabs 62b.

本発明は、前記の問題に鑑みてなされたものであって、その目的は、タブを正極シート（正極体）や負極シート（負極体）に接続する必要がなく、正極と負極の短絡防止を確保した状態でデッドスペースを低減して体積エネルギ密度の向上を図ることができる二次電池用電極組立体及び二次電池を提供することにある。また、前記二次電池を搭載した車両を提供することにある。   The present invention has been made in view of the above problems, and its purpose is to prevent the short-circuit between the positive electrode and the negative electrode without the need to connect the tab to the positive electrode sheet (positive electrode body) or the negative electrode sheet (negative electrode body). An object of the present invention is to provide a secondary battery electrode assembly and a secondary battery that can reduce the dead space and improve the volume energy density in a secured state. Another object is to provide a vehicle equipped with the secondary battery.

前記の目的を達成するため、請求項１に記載の発明は、正極用活物質が塗布された正極シートと、負極用活物質が塗布された負極シートと、前記正極シートと前記負極シートの間に介在されるセパレータとからなる層を複数層有する構成の二次電池用電極組立体であって、前記正極シートには一端側に正極切り欠き部及び正極用活物質非塗布部が形成されており、前記負極シートには一端側に前記正極シートの前記正極用活物質非塗布部と重なる位置に負極切り欠き部が形成され、かつ前記正極切り欠き部と重なる位置に負極用活物質非塗布部が形成されており、前記セパレータには一端側に前記正極切り欠き部及び前記負極切り欠き部と重なる位置にセパレータ切り欠き部が形成されており、前記正極用活物質非塗布部及び前記負極用活物質非塗布部は、それぞれ前記正極シートあるいは前記負極シートの一端側から他端側の方向に切り込まれた第一切り込みと、前記第一切り込みにおける他端側の先端部を通りかつ前記第一切り込みと交差する方向に切り込まれた第二切り込みを有しており、前記正極シートは前記正極用活物質非塗布部が正極端子接続用部材に直接接合可能に構成され、前記負極シートは前記負極用活物質非塗布部が負極端子接続用部材に直接接合可能に構成されている。ここで、「直接接合可能」とは、正極タブを介さずに正極用活物質非塗布部が正極端子接続用部材に接合されるか、複数の正極用活物質非塗布部が重なり合った状態で正極端子接続用部材に接合されることを意味し、負極用活物質非塗布部が負極端子接続用部材に接合される場合も同様である。 In order to achieve the above object, the invention according to claim 1 is a positive electrode sheet coated with a positive electrode active material, a negative electrode sheet coated with a negative electrode active material, and between the positive electrode sheet and the negative electrode sheet. An electrode assembly for a secondary battery having a plurality of layers composed of separators interposed between the positive electrode sheet, a positive electrode notch portion and a positive electrode active material non-applied portion formed on one end side of the positive electrode sheet The negative electrode sheet is formed with a negative electrode notch at a position overlapping with the positive electrode active material non-applied portion of the positive electrode sheet on one end side, and the negative electrode active material is not applied at a position overlapping with the positive electrode notch A separator notch is formed at one end side of the separator so as to overlap with the positive electrode notch and the negative electrode notch, and the positive electrode active material non-applied part and the negative electrode are formed. Life The non-applied portion is a first cut cut in a direction from one end side to the other end side of the positive electrode sheet or the negative electrode sheet, and passes through the tip portion on the other end side in the first cut and the first cut. The positive electrode sheet is configured such that the positive electrode active material non-applied portion can be directly bonded to the positive electrode terminal connecting member, and the negative electrode sheet is the negative electrode. The active material non-application portion is configured to be directly connectable to the negative electrode terminal connecting member. Here, “direct bonding is possible” means that the positive electrode active material non-applied portion is bonded to the positive electrode terminal connecting member without a positive electrode tab or a plurality of positive electrode active material non-applied portions are overlapped. This means that it is bonded to the positive electrode terminal connecting member, and the same applies to the case where the negative electrode active material non-coated portion is bonded to the negative electrode terminal connecting member.

この発明では、複数層積層された正極シートは従来技術と異なり、正極タブを使用せずに正極用活物質非塗布部同士が接合された状態で正極端子接続用部材に接合され、複数層積層された負極シートは負極タブを使用せずに負極用活物質非塗布部同士が接合された状態で負極端子接続用部材に接合される。複数層の正極シートは間にセパレータ及び負極シートが存在する。しかし、セパレータ及び負極シートに形成された負極切り欠き部及びセパレータ切り欠き部は正極用活物質非塗布部と重なる状態で存在するため、複数の正極用活物質非塗布部を正極シートの積層方向に寄せることにより、正極用活物質非塗布部同士が接合された状態で負極シートと干渉せずに正極端子接続用部材に接合することができる。また、複数層の負極シートは、間にセパレータ及び正極シートが存在する。しかし、セパレータ及び正極シートに形成されたセパレータ切り欠き部及び正極切り欠き部は負極用活物質非塗布部と重なる状態で存在するため、複数の負極用活物質非塗布部を負極シートの積層方向に寄せることにより、負極用活物質非塗布部同士が接合された状態で正極シートと干渉せずに負極端子接続用部材に接合することができる。また、正極用活物質は正極シートの正極用活物質非塗布部が形成された部分と正極切り欠き部が形成された部分との間にも塗布され、負極用活物質は負極シートの負極用活物質非塗布部が形成された部分と負極切り欠き部が形成された部分との間にも塗布されているため、デッドスペースが少なくなる。したがって、正極タブや負極タブを正極シート（正極体）や負極シート（負極体）に接続する必要がなく、二次電池において正極と負極の短絡防止を確保した状態でデッドスペースを低減して体積エネルギ密度の向上を図ることができる。
複数の正極用活物質非塗布部同士あるいは複数の負極用活物質非塗布部同士を接合させる場合、切り込みが無い状態では正極シートや負極シートが薄く、積層間隔が小さなことが要件となるが、切り込みを設けることにより正極シートや負極シートの厚さや積層間隔の自由度が大きくなる。この発明では、正極用活物質非塗布部及び負極用活物質非塗布部は、それぞれ前記第一の切り込みと前記第二切り込みを有するため、正極シートあるいは負極シートに対して両開きの状態で折り曲げ可能になり、正極用活物質非塗布部あるいは負極用活物質非塗布部は二箇所で正極端子接続用部材あるいは負極端子接続用部材に接合される。したがって、一箇所で接合される構成に比べて強度的に良くなる。
請求項２に記載の発明は、正極用活物質が塗布された正極シートと、負極用活物質が塗布された負極シートと、前記正極シートと前記負極シートの間に介在されるセパレータとからなる層を複数層有する構成の二次電池用電極組立体であって、前記正極シートには一端側に正極切り欠き部及び正極用活物質非塗布部が形成されており、前記負極シートには一端側に前記正極シートの前記正極用活物質非塗布部と重なる位置に負極切り欠き部が形成され、かつ前記正極切り欠き部と重なる位置に負極用活物質非塗布部が形成されており、前記セパレータには一端側に前記正極切り欠き部及び前記負極切り欠き部と重なる位置にセパレータ切り欠き部が形成されており、前記正極用活物質非塗布部及び前記負極用活物質非塗布部は、それぞれ前記正極シートあるいは前記負極シートの一端側から他端側の方向に切り込まれた２つの第一切り込みを有しており、前記正極シートは前記正極用活物質非塗布部が正極端子接続用部材に直接接合可能に構成され、前記負極シートは前記負極用活物質非塗布部が負極端子接続用部材に直接接合可能に構成されている。
正極用活物質非塗布部あるいは負極用活物質非塗布部を正極シートあるいは負極シートに対して接合する場合、接合力を確保するためには接合部として所定以上の面積が必要になる。両開きの状態では接合部が二箇所になるため、片開きの状態に比べて正極用活物質非塗布部あるいは負極用活物質非塗布部の面積を大きくする必要がある。その結果、正極シートあるいは負極シートに塗布される活物質の量が少なくなる。この発明では、正極用活物質非塗布部及び負極用活物質非塗布部は、それぞれ２つの前記第一切り込みを有するため、正極シートあるいは負極シートに対して片開きの状態で折り曲げ可能になり、正極用活物質非塗布部あるいは負極用活物質非塗布部は一箇所で正極端子接続用部材あるいは負極端子接続用部材に接合される。したがって、二箇所で接合される構成に比べて正極用活物質非塗布部あるいは負極用活物質非塗布部の面積を小さくすることができ、二箇所で接合される構成に比べて正極用活物質あるいは負極用活物質の塗布量を多くでき、二次電池のエネルギ密度が大きくなる。 In the present invention, the positive electrode sheet laminated in a plurality of layers is joined to the positive electrode terminal connecting member in a state in which the positive electrode active material non-applied portions are joined to each other without using the positive electrode tab, unlike the conventional technique. The negative electrode sheet thus bonded is bonded to the negative electrode terminal connecting member in a state where the negative electrode active material non-coated portions are bonded to each other without using the negative electrode tab. A separator and a negative electrode sheet exist between the positive electrode sheets of a plurality of layers. However, since the negative electrode notch part and separator notch part formed in the separator and the negative electrode sheet are present in a state of overlapping with the positive electrode active material non-applied part, a plurality of positive electrode active material non-applied parts are arranged in the stacking direction of the positive electrode sheet. By approaching, it can join to the member for positive electrode terminal connection, without interfering with a negative electrode sheet in the state in which the active material application parts for positive electrodes were joined. Moreover, a separator and a positive electrode sheet exist between the negative electrode sheets of a plurality of layers. However, since the separator notch part and the cathode notch part formed in the separator and the positive electrode sheet are present in a state of overlapping the negative electrode active material non-applied part, a plurality of negative electrode active material non-applied parts are arranged in the stacking direction of the negative electrode sheet. By approaching, it can join to the negative electrode terminal connection member, without interfering with a positive electrode sheet in the state in which the active material non-application parts for negative electrodes were joined. The positive electrode active material is also applied between the portion of the positive electrode sheet where the positive electrode active material non-applied portion is formed and the portion where the positive electrode notch portion is formed, and the negative electrode active material is used for the negative electrode of the negative electrode sheet. Since it is also applied between the portion where the active material non-application portion is formed and the portion where the negative electrode notch portion is formed, the dead space is reduced. Accordingly, there is no need to connect the positive electrode tab or the negative electrode tab to the positive electrode sheet (positive electrode body) or the negative electrode sheet (negative electrode body), and the dead space is reduced and the volume is ensured in the secondary battery while preventing the short circuit between the positive electrode and the negative electrode. The energy density can be improved.
When joining a plurality of positive electrode active material non-applied parts or a plurality of negative electrode active material non-coated parts, in a state where there is no notch, the positive electrode sheet and the negative electrode sheet are thin and the lamination interval is a small requirement, By providing the cuts, the thickness of the positive electrode sheet and the negative electrode sheet and the degree of freedom of the stacking interval are increased. In this invention, the positive electrode active material non-applied portion and the negative electrode active material non-applied portion have the first cut and the second cut, respectively, and can be bent in a double-open state with respect to the positive electrode sheet or the negative electrode sheet. Thus, the positive electrode active material non-applied portion or the negative electrode active material non-applied portion is joined to the positive electrode terminal connecting member or the negative electrode terminal connecting member at two locations. Therefore, the strength is improved as compared with the structure joined at one place.
The invention according to claim 2 comprises a positive electrode sheet coated with a positive electrode active material, a negative electrode sheet coated with a negative electrode active material, and a separator interposed between the positive electrode sheet and the negative electrode sheet. An electrode assembly for a secondary battery having a plurality of layers, wherein the positive electrode sheet has a positive electrode notch portion and a positive electrode active material non-applied portion formed on one end side, and the negative electrode sheet has one end A negative electrode notch portion is formed at a position overlapping the positive electrode active material non-applied portion of the positive electrode sheet on the side, and a negative electrode active material non-applied portion is formed at a position overlapping the positive electrode notch portion, The separator is formed with a separator notch at a position overlapping one end side of the positive electrode notch and the negative electrode notch, and the positive electrode active material non-applied part and the negative electrode active material non-applied part are: Respectively The positive electrode sheet or the negative electrode sheet has two first cuts cut in the direction from one end side to the other end side, and the positive electrode sheet has the positive electrode active material non-applied portion as a positive electrode terminal connecting member. The negative electrode sheet is configured such that the negative electrode active material non-applied portion can be directly bonded to the negative electrode terminal connecting member.
When the positive electrode active material non-applied part or the negative electrode active material non-applied part is bonded to the positive electrode sheet or the negative electrode sheet, a predetermined area or more is required as a bonded part in order to secure a bonding force. Since there are two joint portions in the double-open state, it is necessary to increase the area of the positive electrode active material non-applied portion or the negative electrode active material non-applied portion as compared with the single-open state. As a result, the amount of active material applied to the positive electrode sheet or the negative electrode sheet is reduced. In this invention, since the positive electrode active material non-applied portion and the negative electrode active material non-coated portion each have two first cuts, the positive electrode sheet or the negative electrode sheet can be bent in a single-open state, The positive electrode active material non-applied portion or the negative electrode active material non-applied portion is joined to the positive electrode terminal connecting member or the negative electrode terminal connecting member at one location. Accordingly, the area of the positive electrode active material non-applied portion or the negative electrode active material non-applied portion can be reduced compared to the configuration bonded at two locations, and the positive electrode active material compared to the configuration bonded at two locations. Or the application quantity of the active material for negative electrodes can be increased, and the energy density of a secondary battery becomes large.

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、前記正極シート、前記負極シート及び前記セパレータは一定方向に積層されている。二次電池の構成として、帯状の正極シート及び帯状の負極シートを、帯状のセパレータを挟んだ積層状態で巻回して電極組立体が形成されるものや、複数の正極シート及び複数の負極シートを間にセパレータを挟んで積層して電極組立体が形成されるもの等がある。正極シート、負極シート及びセパレータとして帯状の物を使用して巻回する構成では、複数形成される正極用活物質非塗布部の間隔、負極用活物質非塗布部の間隔、各切り欠き部の間隔が巻回部の内側部と外側部とでは異なる状態に形成する必要がある。しかし、この発明では、正極シート、負極シート及びセパレータはそれぞれ複数枚ずつ設けられて一定方向に積層されている。したがって、同じ正極シート、負極シート及びセパレータを積層すればよく、製造が簡単になる。 According to a third aspect of the invention, in the first or second aspect of the invention, the positive electrode sheet, the negative electrode sheet, and the separator are laminated in a certain direction. As the structure of the secondary battery, a belt-like positive electrode sheet and a belt-like negative electrode sheet are wound in a laminated state with a belt-like separator sandwiched therebetween to form an electrode assembly, or a plurality of positive electrode sheets and a plurality of negative electrode sheets There are some in which an electrode assembly is formed by laminating a separator in between. In a configuration in which a belt-like object is used for winding as a positive electrode sheet, a negative electrode sheet, and a separator, a plurality of positive electrode active material non-applied part intervals, a negative electrode active material non-applied part interval, It is necessary to form the gap in a different state between the inner part and the outer part of the winding part. However, in the present invention, a plurality of positive electrode sheets, negative electrode sheets, and separators are provided and laminated in a certain direction. Therefore, the same positive electrode sheet, negative electrode sheet, and separator may be laminated, and the production becomes simple.

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二次電池用電極組立体を備えた二次電池である。この発明の二次電池は正極と負極の短絡防止を確保した状態でデッドスペースを低減して体積エネルギ密度の向上を図ることができ、製造の際にタブを正極シートや負極シートに接続する必要がない。 The invention according to claim 4 is a secondary battery comprising the electrode assembly for a secondary battery according to any one of claims 1 to 3 . The secondary battery of the present invention can reduce the dead space while ensuring prevention of a short circuit between the positive electrode and the negative electrode, thereby improving the volume energy density, and needs to connect the tab to the positive electrode sheet or the negative electrode sheet during manufacturing. There is no.

請求項５に記載の発明は、請求項４に記載の二次電池が搭載された車両である。したがって、この発明の車両は請求項４に記載の発明の二次電池の効果が得られる。 The invention according to claim 5 is a vehicle on which the secondary battery according to claim 4 is mounted. Therefore, the vehicle of the present invention can achieve the effect of the secondary battery of the invention described in claim 4 .

本発明によれば、タブを正極シートや負極シートに接続する必要がなく、正極と負極の短絡防止を確保した状態でデッドスペースを低減して体積エネルギ密度の向上を図ることができる二次電池用電極組立体及び二次電池を提供することができる。また、前記二次電池を搭載した車両を提供することができる。   According to the present invention, it is not necessary to connect the tab to the positive electrode sheet or the negative electrode sheet, and the secondary battery can reduce the dead space and improve the volume energy density while ensuring the prevention of the short circuit between the positive electrode and the negative electrode. An electrode assembly and a secondary battery can be provided. Moreover, the vehicle carrying the said secondary battery can be provided.

（ａ）は第１の実施形態の正極シート、負極シート及びセパレータの模式斜視図、（ｂ）は正極シート、負極シート及びセパレータを組み付けた状態の模式平面図。(A) is a schematic perspective view of the positive electrode sheet, negative electrode sheet, and separator of 1st Embodiment, (b) is a schematic top view of the state which assembled | attached the positive electrode sheet, the negative electrode sheet, and the separator. 正極シート、負極シート及びセパレータの原材料となる帯状体の部分模式図。The partial schematic diagram of the strip | belt shaped material used as the raw material of a positive electrode sheet, a negative electrode sheet, and a separator. 二次電池の模式平面図。The schematic plan view of a secondary battery. （ａ）は正極用活物質非塗布部及び負極用活物質非塗布部に形成された切り込みの形状を示す模式図、（ｂ）は複数の正極シート又は負極シートが端子接続用部材に接続された状態を示す模式図。(A) is a schematic diagram showing the shape of the cut formed in the positive electrode active material non-applied portion and the negative electrode active material non-applied portion, and (b) is a diagram in which a plurality of positive electrode sheets or negative electrode sheets are connected to the terminal connecting member. The schematic diagram which shows the state. （ａ）は第２の実施形態の二次電池の模式平面図、（ｂ）は複数の正極シート又は負極シートが端子接続用部材に接続された状態を示す模式図、（ｃ）は切り込みの形状を示す模式図。(A) is a schematic plan view of the secondary battery of the second embodiment, (b) is a schematic diagram showing a state in which a plurality of positive electrode sheets or negative electrode sheets are connected to a terminal connecting member, and (c) is a notch. The schematic diagram which shows a shape. （ａ）は別の実施形態の切り込みの形状を示す模式図、（ｂ）は複数の正極シートが端子接続用部材に接続された状態を示す模式図、（ｃ）は別の実施形態の端子接続用部材の模式図。(A) is a schematic diagram which shows the shape of the notch | incision of another embodiment, (b) is a schematic diagram which shows the state in which the some positive electrode sheet was connected to the member for terminal connection, (c) is a terminal of another embodiment. The schematic diagram of the member for a connection. 別の実施形態の正極シート、セパレータ及び負極シートとの関係を示す模式図。The schematic diagram which shows the relationship with the positive electrode sheet of another embodiment, a separator, and a negative electrode sheet. （ａ）は従来技術の発電要素の斜視図、（ｂ）は負極集電体の挟持部に負極の端部が挟み込まれた状態を示す部分拡大斜視図。(A) is a perspective view of a conventional power generation element, (b) is a partially enlarged perspective view showing a state where the end of the negative electrode is sandwiched between the sandwiching portion of the negative electrode current collector. 別の従来技術の電極組立体の模式斜視図。The schematic perspective view of another prior art electrode assembly.

（第１の実施形態）
以下、本発明を具体化した第１の実施形態を図１〜図４にしたがって説明する。
図１（ａ），（ｂ）に示すように、二次電池用電極組立体１０は、正極用活物質１１ａが塗布された正極シート（正極体）１１と、負極用活物質１２ａが塗布された負極シート（負極体）１２と、正極シート１１と負極シート１２の間に介在されるセパレータ１３とからなる層を複数層有する構成である。なお、積層された構成において、層間に図示しない電解液を入れることができる。正極シート１１、負極シート１２及びセパレータ１３はそれぞれ複数枚ずつ設けられて一定方向に積層されている。 (First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1A and 1B, a secondary battery electrode assembly 10 has a positive electrode sheet (positive electrode body) 11 coated with a positive electrode active material 11a and a negative electrode active material 12a. The negative electrode sheet (negative electrode body) 12 and a plurality of layers comprising a positive electrode sheet 11 and a separator 13 interposed between the negative electrode sheet 12 are provided. Note that an electrolyte solution (not shown) can be placed between the layers in the stacked configuration. A plurality of positive electrode sheets 11, negative electrode sheets 12, and separators 13 are provided and laminated in a certain direction.

なお、図１（ａ），（ｂ）は二次電池用電極組立体１０の構成を分かり易くするため模式的に描いたものであり、実際は、正極シート１１及び負極シート１２の枚数は数十枚であり、各部の寸法の比率も実際のものと異なる。例えば、隣り合うセパレータ１３の間隔は１００μｍ〜１６０μｍ程度である。   1A and 1B are schematically drawn for easy understanding of the configuration of the electrode assembly 10 for a secondary battery. In practice, the number of the positive electrode sheets 11 and the negative electrode sheets 12 is several tens. The ratio of the dimensions of each part is different from the actual one. For example, the interval between the adjacent separators 13 is about 100 μm to 160 μm.

図１（ｂ）に示すように、正極用活物質１１ａは正極シート１１の両面に塗布されており、負極用活物質１２ａは負極シート１２の両面に塗布されている。
正極シート１１には一端側に正極切り欠き部１１ｂ及び正極用活物質非塗布部１１ｃが形成されている。負極シート１２には一端側に正極シート１１の正極用活物質非塗布部１１ｃと重なる位置に負極切り欠き部１２ｂが形成され、かつ正極シート１１の正極切り欠き部１１ｂと重なる位置に負極用活物質非塗布部１２ｃが形成されている。 As shown in FIG. 1B, the positive electrode active material 11 a is applied to both surfaces of the positive electrode sheet 11, and the negative electrode active material 12 a is applied to both surfaces of the negative electrode sheet 12.
The positive electrode sheet 11 is formed with a positive electrode notch portion 11b and a positive electrode active material non-applied portion 11c on one end side. The negative electrode sheet 12 has a negative electrode notch portion 12b formed at one end of the negative electrode sheet 11 at a position overlapping the positive electrode active material non-applied portion 11c of the positive electrode sheet 11, and a negative electrode active portion at a position overlapping the positive electrode notch portion 11b of the positive electrode sheet 11. The substance non-application part 12c is formed.

セパレータ１３には一端側に正極切り欠き部１１ｂ及び負極切り欠き部１２ｂと重なる位置にセパレータ切り欠き部１３ａが形成されている。セパレータ１３は正極シート１１と負極シート１２との電気的絶縁性を確保するため、正極シート１１及び負極シート１２より大きく形成されるとともにセパレータ切り欠き部１３ａが正極切り欠き部１１ｂ及び負極切り欠き部１２ｂより小さく形成されている。   The separator 13 has a separator notch 13a formed on one end side at a position overlapping the positive electrode notch 11b and the negative electrode notch 12b. In order to ensure the electrical insulation between the positive electrode sheet 11 and the negative electrode sheet 12, the separator 13 is formed larger than the positive electrode sheet 11 and the negative electrode sheet 12, and the separator notch portion 13a has the positive electrode notch portion 11b and the negative electrode notch portion. It is formed smaller than 12b.

正極シート１１及び負極シート１２は、図２に示すように、金属箔製の帯状材料１４ａに正極用活物質１１ａあるいは負極用活物質１２ａの塗布と、正極用活物質非塗布部１１ｃあるいは負極用活物質非塗布部１２ｃの形成と、正極切り欠き部１１ｂ及び負極切り欠き部１２ｂの形成が行われた後、それぞれ１枚ずつ所定の大きさに切り離されて形成される。また、セパレータ１３は、絶縁材製の帯状材料１４ｂにセパレータ切り欠き部１３ａが所定間隔で形成された後、それぞれ１枚ずつ所定の大きさに切り離されて形成される。   As shown in FIG. 2, the positive electrode sheet 11 and the negative electrode sheet 12 are formed by applying a positive electrode active material 11 a or a negative electrode active material 12 a to a strip-shaped material 14 a made of metal foil, and a positive electrode active material non-applied part 11 c or a negative electrode material. After the active material non-applied portion 12c and the positive electrode notch portion 11b and the negative electrode notch portion 12b are formed, the active material non-coated portion 12c is cut into a predetermined size. The separator 13 is formed by separating the separator notches 13a into a predetermined size after the separator notches 13a are formed in the strip material 14b made of an insulating material at predetermined intervals.

図４（ａ）に示すように、正極用活物質非塗布部１１ｃ及び負極用活物質非塗布部１２ｃには正極用活物質非塗布部１１ｃあるいは負極用活物質非塗布部１２ｃを正極シート１１あるいは負極シート１２に対して両開きの状態で折り曲げ可能にする切り込みが形成されている。詳述すると、正極用活物質非塗布部１１ｃ及び負極用活物質非塗布部１２ｃは、正極シート１１あるいは負極シート１２の一端側から他端側の方向に切り込まれた第一切り込み１５ａと、第一切り込み１５ａにおける他端側の先端部を通りかつ第一切り込み１５ａと交差する方向に切り込まれた第二切り込み１５ｂを有する。即ち、切り込みは、矩形状の正極用活物質非塗布部１１ｃあるいは負極用活物質非塗布部１２ｃの中央部において短辺に沿って延びる第一切り込み１５ａと、長辺に沿って延びる第二切り込み１５ｂとで、逆Ｔ字状となるように形成されている。   As shown in FIG. 4A, the positive electrode active material non-applied part 11c and the negative electrode active material non-applied part 12c are replaced with the positive electrode active material non-applied part 11c or the negative electrode active material non-applied part 12c. Or the cut | notch which makes it bendable in the state of double opening with respect to the negative electrode sheet 12 is formed. More specifically, the positive electrode active material non-applied part 11c and the negative electrode active material non-applied part 12c are a first cut 15a cut in the direction from one end side to the other end side of the positive electrode sheet 11 or the negative electrode sheet 12, It has the 2nd cut 15b cut in the direction which passes along the front-end | tip part of the other end side in the 1st cut 15a, and cross | intersects the 1st cut 15a. That is, the notch is divided into the first notch 15a extending along the short side and the second notch extending along the long side at the center of the rectangular positive electrode active material non-applied part 11c or the negative electrode active material non-applied part 12c. 15b and formed in an inverted T shape.

そして、図４（ｂ）に示すように、複数枚の互いに隣接する正極シート１１は、正極用活物質非塗布部１１ｃが第一切り込み１５ａ及び第二切り込み１５ｂの部分で両開きとなった状態で、両開きとなった部分の先端側の接合部１１ｄが重なり合った状態で正極端子接続用部材１６に対して二箇所で接合されている。また、負極シート１２は負極用活物質非塗布部１２ｃが第一切り込み１５ａ及び第二切り込み１５ｂの部分で両開きとなった状態で、両開きの先端側の接合部１２ｄが重なり合った状態で負極端子接続用部材１７に対して二箇所で接合されている。なお、接合は例えばインダイレクト溶接で行われる。即ち、正極シート１１は正極用活物質非塗布部１１ｃが正極端子接続用部材１６に他の部材を介さずに直接接合可能に構成され、負極シート１２は負極用活物質非塗布部１２ｃが負極端子接続用部材１７に他の部材を介さずに直接接合可能に構成されている。   As shown in FIG. 4B, the positive electrode sheets 11 adjacent to each other are in a state where the positive electrode active material non-applied portion 11c is double-opened at the first cut 15a and the second cut 15b. The joint portion 11d on the front end side of the double-opened portion is joined to the positive terminal connecting member 16 at two locations in a state where they overlap each other. Further, the negative electrode sheet 12 is connected to the negative electrode terminal in a state where the negative electrode active material non-applied portion 12c is double-opened at the first cut 15a and the second cut 15b, and the joint 12d on the leading end side of the double-open is overlapped. It is joined to the member 17 at two locations. In addition, joining is performed by indirect welding, for example. That is, the positive electrode sheet 11 is configured such that the positive electrode active material non-applied portion 11c can be directly joined to the positive electrode terminal connecting member 16 without any other member, and the negative electrode sheet 12 is configured so that the negative electrode active material non-applied portion 12c is negative. The terminal connecting member 17 is configured to be directly connectable without using another member.

複数の正極用活物質非塗布部１１ｃ同士あるいは複数の負極用活物質非塗布部１２ｃ同士を接合させる場合、第一切り込み１５ａ及び第二切り込み１５ｂが無い状態では正極シート１１や負極シート１２が薄く、積層間隔が小さなことが要件となるが、第一切り込み１５ａ及び第二切り込み１５ｂを設けることにより正極シート１１や負極シート１２の厚さや積層間隔の自由度が大きくなる。この実施形態では、正極シート１１あるいは負極シート１２に対して両開きの状態で折り曲げ可能にする第一切り込み１５ａ及び第二切り込み１５ｂが形成され、正極用活物質非塗布部１１ｃあるいは負極用活物質非塗布部１２ｃは二箇所で正極端子接続用部材１６あるいは負極端子接続用部材１７に接合される。そのため、一箇所で接合される構成に比べて強度的に良くなる。   When bonding a plurality of positive electrode active material non-applied portions 11c or a plurality of negative electrode active material non-applied portions 12c to each other, the positive electrode sheet 11 and the negative electrode sheet 12 are thin without the first cut 15a and the second cut 15b. Although it is a requirement that the stacking interval is small, the thickness of the positive electrode sheet 11 and the negative electrode sheet 12 and the degree of freedom of the stacking interval are increased by providing the first cut 15a and the second cut 15b. In this embodiment, a first notch 15a and a second notch 15b that can be bent in a double-open state with respect to the positive electrode sheet 11 or the negative electrode sheet 12 are formed, and the positive electrode active material non-applied portion 11c or the negative electrode active material is not formed. The application part 12c is joined to the positive terminal connecting member 16 or the negative terminal connecting member 17 at two locations. For this reason, the strength is improved as compared with a configuration in which the bonding is performed at one place.

複数層積層された正極シート１１は従来技術と異なり、正極タブを使用せずに正極用活物質非塗布部１１ｃ同士が接合された状態で正極端子接続用部材１６に接合され、複数層積層された負極シート１２は負極タブを使用せずに負極用活物質非塗布部１２ｃ同士が接合された状態で負極端子接続用部材１７に接合される。そして、隣り合う正極シート１１の間にセパレータ１３及び負極シート１２が存在する。しかし、セパレータ１３及び負極シート１２のセパレータ切り欠き部１３ａ及び負極切り欠き部１２ｂは正極用活物質非塗布部１１ｃと重なる状態で存在する。そのため、隣り合う正極用活物質非塗布部１１ｃを正極シート１１の積層方向に寄せることにより、正極用活物質非塗布部１１ｃ同士が接合された状態で負極シート１２と干渉せずに正極端子接続用部材１６に接合することができる。また、隣り合う負極シート１２の間にセパレータ１３及び正極シート１１が存在する。しかし、セパレータ切り欠き部１３ａ及び正極切り欠き部１１ｂは負極用活物質非塗布部１２ｃと重なる状態で存在するため、隣り合う負極用活物質非塗布部１２ｃを負極シート１２の積層方向に寄せることにより、負極用活物質非塗布部１２ｃ同士が接合された状態で正極シート１１と干渉せずに負極端子接続用部材１７に接合することができる。   Unlike the prior art, the positive electrode sheet 11 laminated in a plurality of layers is joined to the positive electrode terminal connecting member 16 in a state where the positive electrode active material non-applied portions 11c are joined to each other without using a positive electrode tab. The negative electrode sheet 12 is bonded to the negative electrode terminal connecting member 17 in a state where the negative electrode active material non-applied portions 12c are bonded without using a negative electrode tab. A separator 13 and a negative electrode sheet 12 exist between the adjacent positive electrode sheets 11. However, the separator notch part 13a and the negative electrode notch part 12b of the separator 13 and the negative electrode sheet 12 exist in a state of overlapping with the positive electrode active material non-application part 11c. Therefore, the positive electrode active material non-applied part 11c is moved in the stacking direction of the positive electrode sheet 11 so that the positive electrode active material non-applied part 11c is joined to the positive electrode terminal 12 without interfering with the negative electrode sheet 12. It can be joined to the member 16 for use. Moreover, the separator 13 and the positive electrode sheet 11 exist between the adjacent negative electrode sheets 12. However, since the separator notch portion 13a and the positive electrode notch portion 11b overlap with the negative electrode active material non-applied portion 12c, the adjacent negative electrode active material non-applied portion 12c is brought close to the lamination direction of the negative electrode sheet 12. Thus, the negative electrode active material non-applied portions 12c can be bonded to the negative electrode terminal connecting member 17 without interfering with the positive electrode sheet 11 in a state where the negative electrode active material non-applied portions 12c are bonded.

また、正極用活物質１１ａは正極シート１１の正極用活物質非塗布部１１ｃが形成された部分と正極切り欠き部１１ｂが形成された部分との間にも塗布され、負極用活物質１２ａは負極シート１２の負極用活物質非塗布部１２ｃが形成された部分と負極切り欠き部１２ｂが形成された部分との間にも塗布されているため、デッドスペースが少なくなる。したがって、正極タブや負極タブを正極シート（正極体）１１や負極シート（負極体）１２にいちいち接続する必要がなく、二次電池１９において正極と負極の短絡防止を確保した状態でデッドスペースを低減して体積エネルギ密度の向上を図ることができる。   The positive electrode active material 11a is also applied between the portion of the positive electrode sheet 11 where the positive electrode active material non-applied portion 11c is formed and the portion where the positive electrode notch portion 11b is formed. Since the negative electrode sheet 12 is also applied between the portion where the negative electrode active material non-application portion 12c is formed and the portion where the negative electrode cutout portion 12b is formed, the dead space is reduced. Therefore, it is not necessary to connect the positive electrode tab or the negative electrode tab to the positive electrode sheet (positive electrode body) 11 or the negative electrode sheet (negative electrode body) 12 one by one, and in the secondary battery 19, dead space is secured while preventing the short circuit between the positive electrode and the negative electrode. The volume energy density can be improved by reduction.

前記のように構成された二次電池用電極組立体１０は、図３に示すように、電池ケース（電槽）１８に収容され、図示しない電解液とともに二次電池１９が構成される。なお、図３では正極シート１１が正極端子接続用部材１６に、負極シート１２が負極端子接続用部材１７に接続される前の状態で示し、正極端子接続用部材１６及び負極端子接続用部材１７の図示を省略している。また、二次電池１９は、例えば、車両に搭載されて使用される。   As shown in FIG. 3, the secondary battery electrode assembly 10 configured as described above is accommodated in a battery case (battery case) 18, and a secondary battery 19 is configured with an electrolyte solution (not shown). 3, the positive electrode sheet 11 is shown in a state before being connected to the positive electrode terminal connecting member 16 and the negative electrode sheet 12 is connected to the negative electrode terminal connecting member 17, and the positive electrode terminal connecting member 16 and the negative electrode terminal connecting member 17 are shown. Is omitted. Moreover, the secondary battery 19 is mounted and used, for example in a vehicle.

この実施形態によれば、以下に示す効果を得ることができる。
（１）二次電池用電極組立体１０は、正極用活物質１１ａが塗布された正極シート（正極体）１１と、負極用活物質１２ａが塗布された負極シート（負極体）１２と、正極シート１１と負極シート１２の間に介在されるセパレータ１３とからなる層を複数層有する構成である。正極シート１１には一端側に正極切り欠き部１１ｂ及び正極用活物質非塗布部１１ｃが形成されており、負極シートには一端側に正極シート１１の正極用活物質非塗布部１１ｃと重なる位置に負極切り欠き部１２ｂが形成され、かつ正極切り欠き部１１ｂと重なる位置に負極用活物質非塗布部１２ｃが形成されている。セパレータ１３には一端側に正極切り欠き部１１ｂ及び負極切り欠き部１２ｂと重なる位置にセパレータ切り欠き部１３ａが形成されている。そして、正極シート１１は正極用活物質非塗布部１１ｃが正極端子接続用部材１６に直接接合可能に構成され、負極シート１２は負極用活物質非塗布部１２ｃが負極端子接続用部材１７に直接接合可能に構成されている。したがって、タブを正極シート１１や負極シート１２に接続する必要がなく、二次電池１９において正極と負極の短絡防止を確保した状態でデッドスペースを低減して体積エネルギ密度の向上を図ることができる。 According to this embodiment, the following effects can be obtained.
(1) The secondary battery electrode assembly 10 includes a positive electrode sheet (positive electrode body) 11 coated with a positive electrode active material 11a, a negative electrode sheet (negative electrode body) 12 coated with a negative electrode active material 12a, and a positive electrode In this configuration, a plurality of layers including a separator 13 interposed between the sheet 11 and the negative electrode sheet 12 are provided. The positive electrode sheet 11 has a positive electrode notch portion 11b and a positive electrode active material non-applied portion 11c formed on one end side, and the negative electrode sheet has a position overlapping with the positive electrode active material non-applied portion 11c of the positive electrode sheet 11 on one end side. The negative electrode notch portion 12b is formed on the negative electrode, and the negative electrode active material non-coating portion 12c is formed at a position overlapping the positive electrode notch portion 11b. The separator 13 has a separator notch 13a formed on one end side at a position overlapping the positive electrode notch 11b and the negative electrode notch 12b. The positive electrode sheet 11 is configured such that the positive electrode active material non-applied portion 11 c can be directly bonded to the positive electrode terminal connecting member 16, and the negative electrode sheet 12 is configured such that the negative electrode active material non-applied portion 12 c is directly connected to the negative electrode terminal connecting member 17. It is configured to be joinable. Therefore, it is not necessary to connect the tab to the positive electrode sheet 11 or the negative electrode sheet 12, and in the secondary battery 19, the dead space can be reduced and the volume energy density can be improved in a state in which the prevention of short circuit between the positive electrode and the negative electrode is ensured. .

（２）正極シート１１、負極シート１２及びセパレータ１３はそれぞれ一定方向に積層されている。したがって、同じ正極シート１１、負極シート１２及びセパレータ１３を積層すればよく、帯状の正極シート及び帯状の負極シートを、帯状のセパレータを挟んだ積層状態で巻回した構成のものに比べて製造が簡単になる。なぜならば、正極シート、負極シート及びセパレータとして帯状の物を使用して巻回する構成では、複数形成される正極用活物質非塗布部１１ｃの間隔、負極用活物質非塗布部１２ｃの間隔、正極切り欠き部１１ｂ、負極切り欠き部１２ｂ、セパレータ切り欠き部１３ａの間隔が巻回部の内側部と外側部とでは異なる状態に形成する必要があり、製造が複雑になるからである。   (2) The positive electrode sheet 11, the negative electrode sheet 12, and the separator 13 are each laminated in a certain direction. Therefore, the same positive electrode sheet 11, negative electrode sheet 12 and separator 13 may be laminated, and the production is made in comparison with a configuration in which a belt-like positive electrode sheet and a belt-like negative electrode sheet are wound in a laminated state with a belt-like separator interposed therebetween. It will be easy. This is because, in a configuration in which a belt-shaped object is used as a positive electrode sheet, a negative electrode sheet, and a separator, a plurality of positive electrode active material non-applied portions 11c are spaced apart, a negative electrode active material non-applied portion 12c is spaced apart, This is because the positive electrode notch portion 11b, the negative electrode notch portion 12b, and the separator notch portion 13a need to be formed with different intervals between the inner side portion and the outer side portion of the winding portion, and the manufacturing becomes complicated.

（３）正極用活物質非塗布部１１ｃ及び負極用活物質非塗布部１２ｃは、それぞれ正極シート１１あるいは負極シート１２の一端側から他端側の方向に切り込まれた第一切り込み１５ａと、第一切り込み１５ａにおける他端側の先端部を通りかつ第一切り込み１５ａと交差する方向に切り込まれた第二切り込み１５ｂを有する。そのため、正極用活物質非塗布部１１ｃあるいは負極用活物質非塗布部１２ｃを正極シート１１あるいは負極シート１２に対して両開きの状態で折り曲げ可能になる。したがって、一箇所で接合される構成に比べて強度的に良くなる。   (3) The positive electrode active material non-applied portion 11c and the negative electrode active material non-applied portion 12c are each a first cut 15a cut in the direction from one end side to the other end side of the positive electrode sheet 11 or the negative electrode sheet 12, respectively. It has the 2nd cut 15b cut in the direction which passes along the front-end | tip part of the other end side in the 1st cut 15a, and cross | intersects the 1st cut 15a. Therefore, the positive electrode active material non-applied portion 11 c or the negative electrode active material non-applied portion 12 c can be bent with respect to the positive electrode sheet 11 or the negative electrode sheet 12 in a double-open state. Therefore, the strength is improved as compared with the structure joined at one place.

（４）二次電池１９は前記構成の二次電池用電極組立体１０を備えているため、（１）〜（３）の効果を奏する。
（５）二次電池１９は車両に搭載されて使用される。したがって、車両は二次電池の（４）の効果が得られる。 (4) Since the secondary battery 19 includes the secondary battery electrode assembly 10 configured as described above, the effects (1) to (3) are achieved.
(5) The secondary battery 19 is mounted on a vehicle and used. Therefore, the vehicle can achieve the effect (4) of the secondary battery.

（第２の実施形態）
次に、本発明を具体化した第２の実施形態を図５（ａ），（ｂ），（ｃ）にしたがって説明する。この実施形態では、二次電池とした状態で耐振動性と放熱性とを向上させる構成を備えている点が前記第１の実施形態と異なっている。第１の実施形態と同一部分は同一符号を付して詳しい説明を省略する。 (Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. 5 (a), (b), and (c). This embodiment is different from the first embodiment in that it has a configuration for improving vibration resistance and heat dissipation in a state where it is a secondary battery. The same parts as those in the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

図５（ａ）に示すように、二次電池用電極組立体１０は、一部の負極シート１２の間に、二次電池用電極組立体１０が電池ケース１８に収容された状態で二次電池用電極組立体１０を電池ケース１８に固定する板体２０を備えている。板体２０は両端に幅広部２０ａが形成され、幅広部２０ａにおいて電池ケース１８の内面に固定されている。板体２０は熱伝導性が良い電気的絶縁材、例えば、樹脂で形成されている。   As shown in FIG. 5A, the secondary battery electrode assembly 10 is a secondary battery in a state where the secondary battery electrode assembly 10 is accommodated in a battery case 18 between some of the negative electrode sheets 12. A plate body 20 for fixing the battery electrode assembly 10 to the battery case 18 is provided. The plate 20 has wide portions 20a at both ends, and is fixed to the inner surface of the battery case 18 at the wide portions 20a. The plate 20 is made of an electrically insulating material having good thermal conductivity, for example, a resin.

図５（ｂ）に示すように、正極シート１１の正極用活物質非塗布部１１ｃ及び負極シート１２の負極用活物質非塗布部１２ｃは、板体２０に固定された正極端子接続用部材２１あるいは負極端子接続用部材２２に、複数枚ずつ接合されている。なお、正極用活物質非塗布部１１ｃ及び負極用活物質非塗布部１２ｃは、正極端子接続用部材２１あるいは負極端子接続用部材２２の両側に接合されるが、図５（ｂ）では片側部分の図示を省略している。この実施形態では切り込みは、図５（ｃ）に示すように、正極シート１１あるいは負極シート１２の幅方向（図の上下方向）に延びる２本の平行線となっている。即ち、正極用活物質非塗布部１１ｃ及び負極用活物質非塗布部１２ｃは、正極シート１１あるいは負極シート１２の一端側から他端側の方向に切り込まれた２つの第一切り込み１５ａを有する。   As shown in FIG. 5 (b), the positive electrode active material non-applied portion 11 c of the positive electrode sheet 11 and the negative electrode active material non-applied portion 12 c of the negative electrode sheet 12 are fixed to the plate body 20. Alternatively, a plurality of sheets are joined to the negative terminal connecting member 22. The positive electrode active material non-applied portion 11c and the negative electrode active material non-applied portion 12c are joined to both sides of the positive electrode terminal connecting member 21 or the negative electrode terminal connecting member 22, but in FIG. Is omitted. In this embodiment, the cuts are two parallel lines extending in the width direction (vertical direction in the drawing) of the positive electrode sheet 11 or the negative electrode sheet 12, as shown in FIG. That is, the positive electrode active material non-applied portion 11c and the negative electrode active material non-applied portion 12c have two first cuts 15a cut in the direction from one end side to the other end side of the positive electrode sheet 11 or the negative electrode sheet 12. .

なお、図５（ａ）も図１（ｂ）と同様、二次電池用電極組立体１０の構成を分かり易くするため模式的に描いたものであり、実際は、正極シート１１及び負極シート１２の枚数は数十枚であり、各部の寸法の比率も実際のものと異なる。図５（ａ）に示す矢印は、正極用活物質非塗布部１１ｃあるいは負極用活物質非塗布部１２ｃを正極端子接続用部材２１あるいは負極端子接続用部材２２に対して接合する際に、正極用活物質非塗布部１１ｃあるいは負極用活物質非塗布部１２ｃを正極端子接続用部材２１あるいは負極端子接続用部材２２に近づける方向を示している。   Note that FIG. 5A is also schematically illustrated in order to make the configuration of the secondary battery electrode assembly 10 easier to understand, as in FIG. 1B. The number of sheets is several tens and the ratio of dimensions of each part is different from the actual one. The arrow shown in FIG. 5A indicates that the positive electrode active material non-applied portion 11c or the negative electrode active material non-applied portion 12c is bonded to the positive electrode terminal connecting member 21 or the negative electrode terminal connecting member 22. The direction in which the active material non-applied portion 11c or the negative electrode active material non-applied portion 12c is brought closer to the positive terminal connecting member 21 or the negative terminal connecting member 22 is shown.

したがって、この実施形態の二次電池用電極組立体１０を備えた二次電池１９は、板体２０を介して二次電池用電極組立体１０が電池ケース１８に固定されているため、二次電池１９に振動が加わった場合、二次電池用電極組立体１０の振動が抑制される。また、大電流での充・放電を行った場合、発生した熱が、板体２０を介して電池ケース１８に伝導されて電池ケース１８から外部に放出され易くなり、二次電池１９の放熱特性が向上する。   Therefore, the secondary battery 19 including the secondary battery electrode assembly 10 according to this embodiment has the secondary battery electrode assembly 10 fixed to the battery case 18 via the plate body 20. When vibration is applied to the battery 19, vibration of the secondary battery electrode assembly 10 is suppressed. Further, when charging / discharging with a large current is performed, the generated heat is easily conducted to the battery case 18 through the plate member 20 and released to the outside from the battery case 18. Will improve.

実施形態は前記に限定されるものではなく、例えば、次のように具体化してもよい。
○ 図６（ａ）に示すように、正極用活物質非塗布部１１ｃ及び負極用活物質非塗布部１２ｃに、それぞれ正極用活物質非塗布部１１ｃあるいは負極用活物質非塗布部１２ｃを正極シート１１あるいは負極シート１２に対して片開きの状態で折り曲げ可能にする形状、例えばＬ字状の切り込み１５ｃを形成してもよい。このような構成では、図６（ｂ）に示すように、複数の正極用活物質非塗布部１１ｃあるいは負極用活物質非塗布部１２ｃは、片開きとなった部分の先端側の接合部１１ｄあるいは接合部１２ｄが重なり合った状態で正極端子接続用部材１６あるいは負極端子接続用部材１７に対して一箇所で接合される。 The embodiment is not limited to the above, and may be embodied as follows, for example.
As shown in FIG. 6A, the positive electrode active material non-applied part 11c and the negative electrode active material non-coated part 12c are respectively connected to the positive electrode active material non-coated part 11c and the negative electrode active material non-coated part 12c. You may form the shape which can be bent with respect to the sheet | seat 11 or the negative electrode sheet | seat 12 in the state of one opening, for example, L-shaped cut 15c. In such a configuration, as shown in FIG. 6 (b), the plurality of positive electrode active material non-applied portions 11c or negative electrode active material non-applied portions 12c are joined at the joint 11d on the front end side of the portion that has been partially opened. Or it joins to the positive electrode terminal connection member 16 or the negative electrode terminal connection member 17 in one place in the state which the junction part 12d overlapped.

正極用活物質非塗布部１１ｃを正極シート１１に、あるいは負極用活物質非塗布部１２ｃを負極シート１２に対して接合する場合、接合力を確保するためには接合部１１ｄ，１２ｄとして所定以上の面積が必要になる。両開きの状態では接合部１１ｄ，１２ｄが二箇所になるため、片開きの状態に比べて正極用活物質非塗布部１１ｃあるいは負極用活物質非塗布部１２ｃの面積を大きくする必要がある。しかし、正極シート１１あるいは負極シート１２に対して片開きの状態で折り曲げ可能にする切り込み１５ｃが形成されている場合は、正極用活物質非塗布部１１ｃあるいは負極用活物質非塗布部１２ｃは一箇所で正極端子接続用部材１６あるいは負極端子接続用部材１７に接合される。したがって、二箇所で接合される構成に比べて正極用活物質非塗布部１１ｃあるいは負極用活物質非塗布部１２ｃの面積を小さくすることができ、二箇所で接合される構成に比べて正極用活物質１１ａあるいは負極用活物質１２ａの塗布量を多くでき、二次電池のエネルギ密度が大きくなる。   When the positive electrode active material non-applied portion 11c is bonded to the positive electrode sheet 11 or the negative electrode active material non-applied portion 12c is bonded to the negative electrode sheet 12, the bonding portions 11d and 12d are not less than a predetermined value in order to secure a bonding force. Area is required. Since the joint portions 11d and 12d are two in the double-open state, it is necessary to increase the area of the positive electrode active material non-applied portion 11c or the negative electrode active material non-applied portion 12c as compared with the single-open state. However, when the notch 15c that can be bent in a single-open state with respect to the positive electrode sheet 11 or the negative electrode sheet 12 is formed, the positive electrode active material non-applied part 11c or the negative electrode active material non-applied part 12c is one. It is joined to the positive terminal connecting member 16 or the negative terminal connecting member 17 at a location. Accordingly, the area of the positive electrode active material non-applied portion 11c or the negative electrode active material non-applied portion 12c can be reduced as compared with the configuration bonded at two locations, and the positive electrode compared with the configuration bonded at two locations. The coating amount of the active material 11a or the negative electrode active material 12a can be increased, and the energy density of the secondary battery is increased.

○ 正極端子接続用部材１６あるいは負極端子接続用部材１７として、図６（ｃ）に示すように、正極用活物質非塗布部１１ｃあるいは負極用活物質非塗布部１２ｃが挿入される挿入溝１６ａあるいは挿入溝１７ａが形成されたものを使用してもよい。挿入溝１６ａあるいは挿入溝１７ａには複数の正極用活物質非塗布部１１ｃあるいは負極用活物質非塗布部１２ｃが挿入される。   As the positive terminal connecting member 16 or the negative terminal connecting member 17, as shown in FIG. 6C, an insertion groove 16a into which the positive active material non-applied portion 11c or the negative active material non-applied portion 12c is inserted. Or you may use what formed the insertion groove | channel 17a. A plurality of positive electrode active material non-applied portions 11c or negative electrode active material non-applied portions 12c are inserted into the insertion grooves 16a or the insertion grooves 17a.

○ 正極シート１１と負極シート１２との電気的絶縁性を確保するため、正極シート１１と負極シート１２との間に独立したセパレータ１３を配置する構成に代えて、図７に示すように、負極シート１２を挟むように折り曲げられて配置されるセパレータ１３を使用したり、あるいは、正極シート１１を挟むように折り曲げられて配置されるセパレータ１３を使用したりしてもよい。正極シート１１と負極シート１２との間に独立したセパレータ１３を配置する構成では、正極シート１１及び負極シート１２が上側にずれた状態や下側にずれた状態で配置されてもセパレータ１３による絶縁確保を図るためには、セパレータ１３の上下方向の長さに余裕を持たせる必要がある。しかし、図７の構成では、負極シート１２がセパレータ１３の屈曲部に当接した状態で配置して、上側のずれ量を確保すればよく、正極シート１１、負極シート１２及びセパレータ１３の組み付け配置作業が容易になる。また、セパレータ１３の数が半分になる。なお、図７ではセパレータ１３の配置を分かり易くするため、セパレータ１３と正極シート１１及び負極シート１２との間隔を大きく図示している。   In order to ensure electrical insulation between the positive electrode sheet 11 and the negative electrode sheet 12, instead of a configuration in which an independent separator 13 is disposed between the positive electrode sheet 11 and the negative electrode sheet 12, as shown in FIG. The separator 13 that is bent and disposed so as to sandwich the sheet 12 may be used, or the separator 13 that is folded and disposed so as to sandwich the positive electrode sheet 11 may be used. In the configuration in which the independent separator 13 is disposed between the positive electrode sheet 11 and the negative electrode sheet 12, even if the positive electrode sheet 11 and the negative electrode sheet 12 are shifted upward or downward, the insulation by the separator 13 is provided. In order to ensure it, it is necessary to provide a margin in the vertical length of the separator 13. However, in the configuration of FIG. 7, the negative electrode sheet 12 may be disposed in contact with the bent portion of the separator 13, and the upper shift amount may be secured. The assembly arrangement of the positive electrode sheet 11, the negative electrode sheet 12, and the separator 13 Work becomes easy. In addition, the number of separators 13 is halved. In FIG. 7, the interval between the separator 13, the positive electrode sheet 11, and the negative electrode sheet 12 is greatly illustrated for easy understanding of the arrangement of the separator 13.

○ 二次電池用電極組立体１０は、正極シート１１と、負極シート１２と、正極シート１１と負極シート１２の間に介在されるセパレータ１３とからなる層を複数層有する構成であればよく、正極シート１１及び負極シート１２がそれぞれ複数枚ずつあり、それらがセパレータ１３を挟んで順次積層された構成に限らない。例えば、帯状の正極シート及び帯状の負極シートがそれぞれ１枚ずつで、両正極シート及び負極シートがセパレータを挟んで複数層に巻回されて長円柱状に形成された構成であってもよい。この場合、正極シートに形成される正極用活物質非塗布部は、複数層に巻回された正極シートの径方向において重なる位置になる箇所に設けられ、負極シートに形成される切り欠き部は複数層に巻回された負極シートの径方向において正極用活物質非塗布部と重なる位置になる箇所に設けられる。また、負極シートに形成される負極用活物質非塗布部は、複数層に巻回された負極シートの径方向において重なる位置になる箇所に設けられ、正極シートに形成される切り欠き部は複数層に巻回された正極シートの径方向において負極用活物質非塗布部と重なる位置になる箇所に設けられる。   The secondary battery electrode assembly 10 only needs to have a structure including a plurality of layers including a positive electrode sheet 11, a negative electrode sheet 12, and a separator 13 interposed between the positive electrode sheet 11 and the negative electrode sheet 12. There are a plurality of positive electrode sheets 11 and a plurality of negative electrode sheets 12, respectively, and the present invention is not limited to the configuration in which the separators 13 are sequentially stacked. For example, a configuration may be adopted in which one strip-shaped positive electrode sheet and one strip-shaped negative electrode sheet are formed, and both the positive electrode sheet and the negative electrode sheet are wound in a plurality of layers with a separator interposed therebetween, and are formed in a long cylindrical shape. In this case, the positive electrode active material non-applied part formed on the positive electrode sheet is provided at a position that overlaps in the radial direction of the positive electrode sheet wound in a plurality of layers, and the notch part formed on the negative electrode sheet is The negative electrode sheet wound in a plurality of layers is provided at a location that overlaps with the positive electrode active material non-applied portion in the radial direction. In addition, the negative electrode active material non-applied portion formed on the negative electrode sheet is provided at a position that overlaps in the radial direction of the negative electrode sheet wound in a plurality of layers, and a plurality of notch portions formed on the positive electrode sheet are provided. The positive electrode sheet wound around the layer is provided at a location that overlaps with the negative electrode active material non-applied portion in the radial direction.

○ 帯状の正極シート及び帯状の負極シートがそれぞれ１枚ずつで、正極シート及び負極シートが１枚の帯状のセパレータを挟んで複数層に巻回される構成の場合、帯状の正極シート、負極シート及びセパレータが長円柱状ではなく、円柱状に巻回された構成としてもよい。   ○ In the case of a configuration in which a belt-like positive electrode sheet and a belt-like negative electrode sheet are each one, and the cathode sheet and the negative electrode sheet are wound in a plurality of layers with one belt-like separator interposed therebetween, the belt-like positive electrode sheet and the negative electrode sheet The separator may be wound in a columnar shape instead of a long columnar shape.

○ 正極用活物質１１ａ及び負極用活物質１２ａの塗布厚さはそれらの種類や正極シート１１や負極シート１２の材料によっても適切な値が異なり、正極用活物質１１ａの方が厚い場合、負極用活物質１２ａの方が厚い場合、両者が同じ場合がある。   ○ Applicable thicknesses of the positive electrode active material 11a and the negative electrode active material 12a vary depending on the type and the material of the positive electrode sheet 11 and the negative electrode sheet 12, and when the positive electrode active material 11a is thicker, When the active material 12a is thicker, both may be the same.

○ 単位面積当たりの正極用活物質１１ａ及び負極用活物質１２ａの塗布量を多くして、体積エネルギ密度を上げてもよい。
○ 第２の実施形態において板体２０を金属製とし、正極端子接続用部材２１及び負極端子接続用部材２２を、絶縁材を介して板体２０に取り付ける構成としてもよい。 The volume energy density may be increased by increasing the coating amount of the positive electrode active material 11a and the negative electrode active material 12a per unit area.
In the second embodiment, the plate body 20 may be made of metal, and the positive terminal connecting member 21 and the negative terminal connecting member 22 may be attached to the plate 20 via an insulating material.

○ 正極シート１１や負極シート１２の積層数は数十枚に限らず、二次電池に要求される大きさや容量によって適宜設定され、数十枚より多くても少なくてもよい。   The number of stacked positive electrode sheets 11 and negative electrode sheets 12 is not limited to several tens, but is appropriately set depending on the size and capacity required for the secondary battery, and may be more or less than several tens.

１０…二次電池用電極組立体、１１…正極シート、１１ａ…正極用活物質、１１ｂ…正極切り欠き部、１１ｃ…正極用活物質非塗布部、１２…負極シート、１２ａ…負極用活物質、１２ｂ…負極切り欠き部、１２ｃ…負極用活物質非塗布部、１３…セパレータ、１３ａ…セパレータ切り欠き部、１５ａ…第一切り込み、１５ｂ…第二切り込み、１６，２１…正極端子接続用部材、１７，２２…負極端子接続用部材、１９…二次電池。   DESCRIPTION OF SYMBOLS 10 ... Secondary battery electrode assembly, 11 ... Positive electrode sheet, 11a ... Positive electrode active material, 11b ... Positive electrode notch part, 11c ... Positive electrode active material non-application part, 12 ... Negative electrode sheet, 12a ... Negative electrode active material , 12b ... Negative electrode notch, 12c ... Negative electrode active material non-application part, 13 ... Separator, 13a ... Separator notch, 15a ... First notch, 15b ... Second notch, 16, 21 ... Positive electrode terminal connecting member , 17, 22 ... Negative electrode terminal connecting member, 19 ... Secondary battery.

Claims (5)

正極用活物質が塗布された正極シートと、負極用活物質が塗布された負極シートと、前記正極シートと前記負極シートの間に介在されるセパレータとからなる層を複数層有する構成の二次電池用電極組立体であって、
前記正極シートには一端側に正極切り欠き部及び正極用活物質非塗布部が形成されており、
前記負極シートには一端側に前記正極シートの前記正極用活物質非塗布部と重なる位置に負極切り欠き部が形成され、かつ前記正極切り欠き部と重なる位置に負極用活物質非塗布部が形成されており、
前記セパレータには一端側に前記正極切り欠き部及び前記負極切り欠き部と重なる位置にセパレータ切り欠き部が形成されており、
前記正極用活物質非塗布部及び前記負極用活物質非塗布部は、それぞれ前記正極シートあるいは前記負極シートの一端側から他端側の方向に切り込まれた第一切り込みと、前記第一切り込みにおける他端側の先端部を通りかつ前記第一切り込みと交差する方向に切り込まれた第二切り込みを有しており、
前記正極シートは前記正極用活物質非塗布部が正極端子接続用部材に直接接合可能に構成され、前記負極シートは前記負極用活物質非塗布部が負極端子接続用部材に直接接合可能に構成されていることを特徴とする二次電池用電極組立体。 Secondary having a plurality of layers comprising a positive electrode sheet coated with a positive electrode active material, a negative electrode sheet coated with a negative electrode active material, and a separator interposed between the positive electrode sheet and the negative electrode sheet A battery electrode assembly comprising:
The positive electrode sheet is formed with a positive electrode notch portion and a positive electrode active material non-applied portion on one end side,
The negative electrode sheet is formed with a negative electrode notch portion at a position overlapping one end side of the positive electrode sheet with the positive electrode active material non-applied portion, and a negative electrode active material non-applied portion at a position overlapping the positive electrode notch portion. Formed,
The separator is formed with a separator notch at a position overlapping one end side with the positive electrode notch and the negative electrode notch,
The positive electrode active material non-applied part and the negative electrode active material non-applied part are a first notch cut in the direction from one end side to the other end side of the positive electrode sheet or the negative electrode sheet, respectively, and the first notch Having a second notch cut in a direction passing through the tip on the other end side and intersecting the first notch,
The positive electrode sheet is configured such that the positive electrode active material non-coated portion can be directly bonded to the positive electrode terminal connecting member, and the negative electrode sheet is configured such that the negative electrode active material non-coated portion can be directly bonded to the negative electrode terminal connecting member. An electrode assembly for a secondary battery, wherein 正極用活物質が塗布された正極シートと、負極用活物質が塗布された負極シートと、前記正極シートと前記負極シートの間に介在されるセパレータとからなる層を複数層有する構成の二次電池用電極組立体であって、
前記正極シートには一端側に正極切り欠き部及び正極用活物質非塗布部が形成されており、
前記負極シートには一端側に前記正極シートの前記正極用活物質非塗布部と重なる位置に負極切り欠き部が形成され、かつ前記正極切り欠き部と重なる位置に負極用活物質非塗布部が形成されており、
前記セパレータには一端側に前記正極切り欠き部及び前記負極切り欠き部と重なる位置にセパレータ切り欠き部が形成されており、
前記正極用活物質非塗布部及び前記負極用活物質非塗布部は、それぞれ前記正極シートあるいは前記負極シートの一端側から他端側の方向に切り込まれた２つの第一切り込みを有しており、
前記正極シートは前記正極用活物質非塗布部が正極端子接続用部材に直接接合可能に構成され、前記負極シートは前記負極用活物質非塗布部が負極端子接続用部材に直接接合可能に構成されていることを特徴とする二次電池用電極組立体。 Secondary having a plurality of layers comprising a positive electrode sheet coated with a positive electrode active material, a negative electrode sheet coated with a negative electrode active material, and a separator interposed between the positive electrode sheet and the negative electrode sheet A battery electrode assembly comprising:
The positive electrode sheet is formed with a positive electrode notch portion and a positive electrode active material non-applied portion on one end side,
The negative electrode sheet is formed with a negative electrode notch portion at a position overlapping one end side of the positive electrode sheet with the positive electrode active material non-applied portion, and a negative electrode active material non-applied portion at a position overlapping the positive electrode notch portion. Formed,
The separator is formed with a separator notch at a position overlapping one end side with the positive electrode notch and the negative electrode notch,
The positive electrode active material non-applied portion and the negative electrode active material non-applied portion each have two first cuts cut in the direction from one end side to the other end side of the positive electrode sheet or the negative electrode sheet. And
The positive electrode sheet is configured such that the positive electrode active material non-coated portion can be directly bonded to the positive electrode terminal connecting member, and the negative electrode sheet is configured such that the negative electrode active material non-coated portion can be directly bonded to the negative electrode terminal connecting member. An electrode assembly for a secondary battery, wherein 前記正極シート、前記負極シート及び前記セパレータは一定方向に積層されている請求項１又は請求項２に記載の二次電池用電極組立体。 The electrode assembly for a secondary battery according to claim 1 or 2 , wherein the positive electrode sheet, the negative electrode sheet, and the separator are laminated in a certain direction. 請求項１〜請求項３のいずれか一項に記載の二次電池用電極組立体を備えた二次電池。 The secondary battery provided with the electrode assembly for secondary batteries as described in any one of Claims 1-3 . 請求項４に記載の二次電池が搭載された車両。 A vehicle equipped with the secondary battery according to claim 4 .
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