JP5370755B2

JP5370755B2 - battery

Info

Publication number: JP5370755B2
Application number: JP2009159786A
Authority: JP
Inventors: 晃雄池田
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2009-07-06
Filing date: 2009-07-06
Publication date: 2013-12-18
Anticipated expiration: 2029-07-06
Also published as: JP2011014493A

Description

本発明は、それぞれ帯状の正極シートと負極シートがセパレータを介在させて重ねられた状態で捲回された捲回電極体を備えた電池に関する。 The present invention relates to a battery including a wound electrode body wound in a state in which a belt-like positive electrode sheet and a negative electrode sheet are stacked with a separator interposed therebetween.

帯状の正極シートと負極シートがセパレータを介在させて重ねられた状態で捲回された捲回電極体は、例えば、特開２００４−２２３３９号公報（特許文献１）に開示されている。同公報に開示された捲回電極体は、帯状の正極シートと負極シートの集電体をセパレータから互いに反対側にはみ出させて成る端部を有している。当該集電体がはみ出た端部には、集電体間に導電性の帯状部材が配置されている。この場合、突出端部にかかる導電性の帯状部材を設けることによって、電池の内部抵抗を小さくして高出力化を図ることができることが記載されている。 A wound electrode body wound in a state where a belt-like positive electrode sheet and a negative electrode sheet are stacked with a separator interposed therebetween is disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-22339 (Patent Document 1). The wound electrode body disclosed in the publication has an end portion formed by protruding a current collector of a belt-like positive electrode sheet and a negative electrode sheet from the separators to opposite sides. At the end portion where the current collector protrudes, a conductive belt-like member is disposed between the current collectors. In this case, it is described that by providing a conductive belt-like member on the projecting end portion, the internal resistance of the battery can be reduced to increase the output.

また、特開２００１−１０２０３０号公報（特許文献２）には、集電体がはみ出た端部に、渦巻き状に形成された空間に、金属製の波板部材が渦巻き状に捲回し、かかる波板部材に捲回された電極体の端面に集電板を溶接した構造が開示されている。かかる構造によれば、電極体の端面と、集電板との接触面積が増大し、接触抵抗が小さくなり、集電効率が向上することが記載されている。 Further, in Japanese Patent Application Laid-Open No. 2001-102030 (Patent Document 2), a corrugated metal member is spirally wound in a space formed in a spiral shape at an end portion where the current collector protrudes, and this is applied. A structure in which a current collector plate is welded to an end face of an electrode body wound around a corrugated plate member is disclosed. According to such a structure, it is described that the contact area between the end face of the electrode body and the current collector plate is increased, the contact resistance is reduced, and the current collection efficiency is improved.

また、特開２０００−２６８８４９号公報(特許文献３)には、基板として金属多孔体を用いたペースト式電極について、電極合剤を充填せず基板の露出した部分に金属多孔体からなる補強板を圧着して補強し、その補強板で補強した部分に金属板集電端子を多数点で接続した構造が開示されている。当該構造では、金属板集電端子を溶接する部分の強度を向上させることが開示されている。 Japanese Patent Laid-Open No. 2000-268849 (Patent Document 3) describes a reinforcing plate made of a porous metal body in an exposed portion of the substrate without filling an electrode mixture with respect to a paste-type electrode using a porous metal body as a substrate. A structure in which a metal plate current collector terminal is connected at a number of points to a portion reinforced by pressure bonding and reinforced with the reinforcing plate is disclosed. In the said structure, improving the intensity | strength of the part which welds a metal plate current collection terminal is disclosed.

また、特開平８−１６７４０７号公報（特許文献４）には、電極リードを有した電極板を補強板に対して複数枚積層してなる密閉型角型電池の電極体において、各電極リードを一緒に包み込んで結束し、各電極板を一体化してなる結束部品を備えた構造が開示されている。 Japanese Patent Laid-Open No. 8-167407 (Patent Document 4) discloses an electrode body of a sealed rectangular battery in which a plurality of electrode plates each having an electrode lead are stacked on a reinforcing plate. A structure provided with a binding component that is wrapped together and bound together and integrated with each electrode plate is disclosed.

また、特開平１１−１６７９３４号公報（特許文献５）には、正極と負極との間に微多孔性フィルムを積層した構成の電極体について、正極を微多孔性フィルムで電極取り出し部位を除いて包み込み、負極と正極とを交互に積層し、積層の両側に補強板を設けて、これらを挟み込み、最後に粘着テープを巻いた構造が開示されている。 Japanese Patent Application Laid-Open No. 11-167934 (Patent Document 5) discloses an electrode body having a structure in which a microporous film is laminated between a positive electrode and a negative electrode, with the positive electrode removed from the electrode by a microporous film. A structure is disclosed in which a negative electrode and a positive electrode are alternately wrapped, reinforcing plates are provided on both sides of the laminate, these are sandwiched, and finally an adhesive tape is wound.

特開２００４−２２３３９号公報JP 2004-22339 A 特開２００１−１０２０３０号公報JP 2001-102030 A 特開２０００−２６８８４９号公報JP 2000-268849 A 特開平８−１６７４０７号公報JP-A-8-167407 特開平１１−１６７９３４号公報JP-A-11-167934

上記特許文献１から３に開示されているように、帯状の正極シートと負極シートがセパレータを介在させて重ねられた状態で捲回された捲回電極体には、捲回軸方向の両側に、正極シートと負極シートの集電体がはみ出している場合がある。この場合、かかる集電体の端部を補強するために、渦巻状の空間に補強用のシートを挟む構造が種々提案されている。他方、かかる捲回電極体は、電池ケースに収容され、電解液に浸漬される。この際、捲回電極体の両側において、集電体端部の渦巻状の空間に補強用のシートが挟まれている場合には、補強用のシートによって捲回電極体の両側が塞がれるため、捲回電極体内部に電解液が浸み込み難くなる。また、捲回電極体の両側に電極板を溶接するような場合もある。この場合、溶接により生じるスパッタ（塵）が捲回電極体内部に入るのを防止したい。 As disclosed in Patent Documents 1 to 3, the wound electrode body wound in a state where the belt-like positive electrode sheet and the negative electrode sheet are overlapped with a separator interposed therebetween is provided on both sides in the winding axis direction. In some cases, the current collector of the positive electrode sheet and the negative electrode sheet protrudes. In this case, in order to reinforce the end of the current collector, various structures have been proposed in which a reinforcing sheet is sandwiched between spiral spaces. On the other hand, the wound electrode body is accommodated in a battery case and immersed in an electrolytic solution. At this time, on both sides of the wound electrode body, when a reinforcing sheet is sandwiched in the spiral space at the end of the current collector, both sides of the wound electrode body are blocked by the reinforcing sheet. Therefore, it is difficult for the electrolytic solution to penetrate into the wound electrode body. In some cases, electrode plates are welded to both sides of the wound electrode body. In this case, it is desired to prevent spatter (dust) generated by welding from entering the wound electrode body.

本発明に係る電池の捲回電極体では、正極シートは、帯状集電体と、帯状集電体の幅方向片側に偏って、帯状集電体の両面に塗工された正極活物質とを有している。また、負極シートは、帯状集電体と、帯状集電体の幅方向片側に偏って、帯状集電体の両面に塗工された負極活物質とを有している。また、正極活物質と負極活物質とは、帯状セパレータを挟んで対向している。正極シートのうち、正極活物質が塗工されていない未塗工部は、帯状セパレータの幅方向の片側からはみ出ている。負極シートのうち、負極活物質が塗工されていない未塗工部は、帯状セパレータの幅方向の反対側からはみ出ている。また、正極シートの未塗工部と負極シートの未塗工部との縁部には、それぞれ導電性の第１シートが挟まれた状態で巻き取られている。また、正極シートの未塗工部と負極シートの未塗工部とには、それぞれ第１シートよりも幅方向の内側に、間隔をあけて、多孔質性の第２シートが挟まれた状態で巻き取られている。そして、第１シートと第２シートの間において未塗工部に注液孔を有する。 In the wound electrode body of the battery according to the present invention, the positive electrode sheet includes a band-shaped current collector and a positive electrode active material applied to both surfaces of the band-shaped current collector, biased to one side in the width direction of the band-shaped current collector. Have. Moreover, the negative electrode sheet has a strip-shaped current collector and a negative electrode active material coated on both surfaces of the strip-shaped current collector so as to be biased to one side in the width direction of the strip-shaped current collector. Moreover, the positive electrode active material and the negative electrode active material are opposed to each other with a strip separator interposed therebetween. In the positive electrode sheet, an uncoated portion where the positive electrode active material is not applied protrudes from one side in the width direction of the strip separator. Of the negative electrode sheet, the uncoated part where the negative electrode active material is not coated protrudes from the opposite side of the strip separator in the width direction. Moreover, the electroconductive 1st sheet | seat is respectively wound up by the edge part of the uncoated part of a positive electrode sheet, and the uncoated part of a negative electrode sheet. In addition, a state in which the porous second sheet is sandwiched between the uncoated portion of the positive electrode sheet and the uncoated portion of the negative electrode sheet at an inner side in the width direction than the first sheet, respectively. It is wound up by. And it has a liquid injection hole in an uncoated part between the 1st sheet and the 2nd sheet.

この場合、正極シートの未塗工部と負極シートの未塗工部とに、それぞれ導電性の第１シートが挟まれた状態で巻き取られている。さらに、第１シートよりも幅方向の内側に間隔をあけて、多孔質性の第２シートが挟まれた状態で巻き取られている。この場合、当該捲回電極体の端部に、電極板を溶接する場合でも、スパッタ（塵）が第２シートよりも内側に入ることによって、電池に不具合を生じるのを防止できる。さらに、第１シートと第２シートの間において未塗工部に注液孔を有するので、捲回電極体の内部に電解液が浸み込みやすい。 In this case, the conductive first sheet is wound around the uncoated portion of the positive electrode sheet and the uncoated portion of the negative electrode sheet, respectively. Furthermore, the porous second sheet is wound in a state of being sandwiched between the first sheet and the inner side in the width direction. In this case, even when the electrode plate is welded to the end portion of the wound electrode body, it is possible to prevent the battery from malfunctioning due to spatter (dust) entering the inside of the second sheet. Furthermore, since the liquid injection hole is provided in the uncoated part between the first sheet and the second sheet, the electrolytic solution easily penetrates into the wound electrode body.

この場合、正極シートの未塗工部に挟まれた第１シートと第２シートは、負極シートと、２枚の帯状セパレータと、正極シートの両面に塗工された正極活物質とを合わせた厚さに設定してもよい。また、負極シートの未塗工部に挟まれた第１シートと第２シートは、正極シートと、２枚の帯状セパレータと、負極シートの両面に塗工された負極活物質とを合わせた厚さに設定してもよい。 In this case, the first sheet and the second sheet sandwiched between the uncoated portions of the positive electrode sheet are a combination of the negative electrode sheet, the two strip-shaped separators, and the positive electrode active material applied to both surfaces of the positive electrode sheet. The thickness may be set. In addition, the first sheet and the second sheet sandwiched between the uncoated portions of the negative electrode sheet are a thickness obtained by combining the positive electrode sheet, the two strip separators, and the negative electrode active material applied to both surfaces of the negative electrode sheet. You may set it.

また、第１シートと第２シートとの間に、注液孔が形成される部位に予め切り欠きが形成された第３シートを有していてもよい。この場合、第３シートに形成された切り欠きは、注液孔が形成される部位から第２シートが形成される側の縁に開いていてもよい。また、この場合、正極シートの未塗工部に挟まれた第３シートは、負極シートと、２枚の帯状セパレータと、正極シートの両面に塗工された正極活物質とを合わせた厚さに設定されていてもよい。また、負極シートの未塗工部に挟まれた第３シートは、正極シートと、２枚の帯状セパレータと、負極シートの両面に塗工された負極活物質とを合わせた厚さに設定されていてもよい。また、正極シートの未塗工部と負極シートの未塗工部の縁部には、それぞれ電極端子が溶接されていてもよい。 Moreover, you may have the 3rd sheet | seat by which the notch was previously formed in the site | part in which a liquid injection hole is formed between the 1st sheet | seat and the 2nd sheet | seat. In this case, the notch formed in the third sheet may open from the portion where the injection hole is formed to the edge on the side where the second sheet is formed. In this case, the third sheet sandwiched between the uncoated portions of the positive electrode sheet has a thickness obtained by combining the negative electrode sheet, the two strip-shaped separators, and the positive electrode active material applied to both surfaces of the positive electrode sheet. May be set. The third sheet sandwiched between the uncoated portions of the negative electrode sheet is set to a thickness that combines the positive electrode sheet, the two strip separators, and the negative electrode active material applied to both sides of the negative electrode sheet. It may be. Moreover, the electrode terminal may be welded to the edge part of the uncoated part of a positive electrode sheet, and the uncoated part of a negative electrode sheet, respectively.

本発明の一実施形態に係る電池を示す縦断面図。The longitudinal cross-sectional view which shows the battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係る電池の捲回電極体の構造を示す斜視図。The perspective view which shows the structure of the winding electrode body of the battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係る電池の捲回電極体の構造を示す断面図。Sectional drawing which shows the structure of the winding electrode body of the battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係る電池の捲回電極体を示す斜視図。The perspective view which shows the winding electrode body of the battery which concerns on one Embodiment of this invention. 本発明の一実施形態に係る電極の電極板を示す斜視図。The perspective view which shows the electrode plate of the electrode which concerns on one Embodiment of this invention. 本発明の他の実施形態に係る電池の捲回電極体を示す斜視図。The perspective view which shows the winding electrode body of the battery which concerns on other embodiment of this invention. 電池を搭載した車両を示す側面図。The side view which shows the vehicle carrying a battery.

以下、本発明の一実施形態に係る電池を図面に基づいて説明する。なお、実質的に同一の機能を有する構成要素を同一の参照符号で示す。 Hereinafter, a battery according to an embodiment of the present invention will be described with reference to the drawings. Components having substantially the same function are denoted by the same reference numerals.

電池１００は、図１に示すように、円筒型の電池であり、円筒型の電池ケース１１０に、捲回電極体１２０と電解液（図示省略）とが収容されている。この実施形態では、電池１００は、リチウムイオン二次電池(lithium-ion secondary battery)を構成している。また、捲回電極体１２０は、図２に示すように、帯状セパレータ１２、１４を介在させた状態で正極シート１１と負極シート１３とを重ねて捲回した構造を備えている。捲回電極体１２０は、絶縁体からなる捲回軸１１２に捲回されている。捲回電極体１２０の捲回軸方向の片側の端部には、電極端子として正極の電極板１２２が溶接され、反対側の端部には電極端子として負極の電極板１２４が溶接されている。また、この実施形態では、電池ケース１１０は、封止キャップ１１４によって封止されている。 As shown in FIG. 1, the battery 100 is a cylindrical battery, and a wound electrode body 120 and an electrolytic solution (not shown) are accommodated in a cylindrical battery case 110. In this embodiment, the battery 100 constitutes a lithium-ion secondary battery. As shown in FIG. 2, the wound electrode body 120 has a structure in which the positive electrode sheet 11 and the negative electrode sheet 13 are overlapped and wound with the strip separators 12 and 14 interposed therebetween. The wound electrode body 120 is wound around a winding shaft 112 made of an insulator. A positive electrode plate 122 is welded as an electrode terminal to one end of the wound electrode body 120 in the winding axis direction, and a negative electrode plate 124 is welded as an electrode terminal to the opposite end. . In this embodiment, the battery case 110 is sealed with a sealing cap 114.

正極シート１１は、帯状集電体３１に正極活物質１１ａが塗工された電極シートである。この実施形態では、正極活物質１１ａは、帯状集電体３１の幅方向片側に偏って、帯状集電体３１の両面に塗工されている。負極シート１３は、帯状集電体４１に負極活物質１３ａが塗工された電極シートである。この実施形態では、負極活物質１３ａは、帯状集電体４１の幅方向片側に偏って、帯状集電体４１の両面に塗工されている。 The positive electrode sheet 11 is an electrode sheet in which a positive electrode active material 11 a is coated on a strip-shaped current collector 31. In this embodiment, the positive electrode active material 11 a is applied to both surfaces of the strip-shaped current collector 31 so as to be biased to one side in the width direction of the strip-shaped current collector 31. The negative electrode sheet 13 is an electrode sheet in which a negative electrode active material 13 a is coated on a strip-shaped current collector 41. In this embodiment, the negative electrode active material 13 a is applied to both surfaces of the band-shaped current collector 41 so as to be biased to one side in the width direction of the band-shaped current collector 41.

この実施形態では、正極シート１１の帯状集電体３１はアルミニウム箔で構成されており、正極活物質１１ａには、例えば、マンガン酸リチウム（ＬｉＭｎ_２Ｏ_４）、コバルト酸リチウム（ＬｉＣｏＯ_２）、ニッケル酸リチウム（ＬｉＮｉＯ_２）などを用いることができる。また、負極シート１３の帯状集電体４１は銅箔で構成されており、負極活物質１３ａには、例えば、グラファイト（Graphite）やアモルファスカーボン（Amorphous Carbon）などの炭素系材料、リチウム含有遷移金属酸化物や遷移金属窒化物等などを用いることができる。 In this embodiment, the strip-shaped current collector 31 of the positive electrode sheet 11 is made of an aluminum foil. Examples of the positive electrode active material 11a include lithium manganate (LiMn ₂ O ₄ ), lithium cobalt oxide (LiCoO ₂ ), Lithium nickelate (LiNiO ₂ ) or the like can be used. Moreover, the strip | belt-shaped collector 41 of the negative electrode sheet | seat 13 is comprised with copper foil, For example, carbon-type materials, such as a graphite (Graphite) and amorphous carbon (Amorphous Carbon), a lithium containing transition metal are used for the negative electrode active material 13a. An oxide, a transition metal nitride, or the like can be used.

正極シート１１の正極活物質１１ａと、負極シート１３の負極活物質１３ａとは、図２に示すように、帯状セパレータ１２、１４を挟んで対向している。また、正極シート１１のうち、正極活物質１１ａが塗工されていない未塗工部１１ｂは、帯状セパレータ１２、１４の幅方向の片側からはみ出ている。また、負極シート１３のうち、負極活物質１３ａが塗工されていない未塗工部１３ｂは、帯状セパレータ１２、１４の幅方向の反対側からはみ出ている。帯状セパレータ１２、１４は、イオン性物質が透過可能な膜であり、この実施形態では、ポリプロピレン製の微多孔膜が用いられている。 The positive electrode active material 11a of the positive electrode sheet 11 and the negative electrode active material 13a of the negative electrode sheet 13 are opposed to each other with the strip separators 12 and 14 interposed therebetween, as shown in FIG. Further, in the positive electrode sheet 11, the uncoated part 11 b to which the positive electrode active material 11 a is not applied protrudes from one side in the width direction of the strip separators 12 and 14. Further, in the negative electrode sheet 13, the uncoated portion 13 b to which the negative electrode active material 13 a is not applied protrudes from the opposite side in the width direction of the strip separators 12 and 14. The strip separators 12 and 14 are membranes through which an ionic substance can permeate. In this embodiment, a microporous membrane made of polypropylene is used.

このように、捲回電極体１２０の捲回軸方向の両側において、帯状セパレータ１２、１４から、正極シート１１の未塗工部１１ｂと、負極シート１３の未塗工部１３ｂとがそれぞれはみ出ている。そして、この実施形態では、当該正極シート１１の未塗工部１１ｂと、負極シート１３の未塗工部１３ｂとに、それぞれ第１シート６１、６２と、第２シート６３、６４と、第３シート６５、６６とがそれぞれ挟まれている。 Thus, on both sides of the wound electrode body 120 in the winding axis direction, the uncoated portion 11b of the positive electrode sheet 11 and the uncoated portion 13b of the negative electrode sheet 13 protrude from the strip separators 12 and 14, respectively. Yes. In this embodiment, the uncoated portion 11b of the positive electrode sheet 11 and the uncoated portion 13b of the negative electrode sheet 13 are respectively connected to the first sheets 61 and 62, the second sheets 63 and 64, and the third sheet. Sheets 65 and 66 are sandwiched, respectively.

第１シート６１、６２は、導電性を有するシートで構成されており、正極シート１１の未塗工部１１ｂと負極シート１３の未塗工部１３ｂとの縁部に、それぞれ挟まれている。また、第２シート６３、６４は、多孔質性のシートで構成されており、正極シート１１の未塗工部１１ｂと負極シート１３の未塗工部１３ｂとにそれぞれ第１シート６１、６２よりも幅方向内側に、第１シート６１、６２との間に間隔をあけて挟まれている。 The first sheets 61 and 62 are composed of conductive sheets, and are sandwiched between edges of the uncoated portion 11b of the positive electrode sheet 11 and the uncoated portion 13b of the negative electrode sheet 13, respectively. In addition, the second sheets 63 and 64 are made of porous sheets, and the first sheets 61 and 62 are formed on the uncoated portion 11b of the positive electrode sheet 11 and the uncoated portion 13b of the negative electrode sheet 13, respectively. Is also sandwiched between the first sheets 61 and 62 on the inner side in the width direction.

また、正極シート１１の未塗工部１１ｂと、負極シート１３の未塗工部１３ｂには、それぞれ第１シート６１、６２と第２シート６３、６４の間に注液孔７２（図１参照）を有する。この実施形態では、第１シート６１、６２と第２シート６３、６４の間に第３シート６５、６６を有している。第３シート６５、６６には、注液孔７２が形成される部位に予め切り欠き７４が形成されている。この実施形態では、切り欠き７４は、図２に示すように、第３シート６５、６６の幅方向中央部を長さ方向（捲回された状態では、捲回周方向となる方向）に沿って切り欠かれた第１切り欠き部７４ａと、当該第１切り欠き部７４ａから第２シート６３、６４が配設される側の縁に向けて切り欠かれた第２切り欠き部７４ｂとを備えている。 Further, in the uncoated portion 11b of the positive electrode sheet 11 and the uncoated portion 13b of the negative electrode sheet 13, a liquid injection hole 72 (see FIG. 1) is provided between the first sheets 61 and 62 and the second sheets 63 and 64, respectively. ). In this embodiment, third sheets 65 and 66 are provided between the first sheets 61 and 62 and the second sheets 63 and 64. In the third sheets 65 and 66, a notch 74 is formed in advance at a site where the liquid injection hole 72 is formed. In this embodiment, as shown in FIG. 2, the notch 74 extends in the length direction (the direction in which the third sheets 65 and 66 are wound in the wound circumferential direction) at the center in the width direction. A first cutout portion 74a cut out and a second cutout portion 74b cut out from the first cutout portion 74a toward the edge on which the second sheets 63 and 64 are disposed. I have.

この実施形態では、第３シート６５、６６に形成された切り欠き７４のうち、幅方向中央部を長さ方向に沿って切り欠かれた第１切り欠き部７４ａは、第３シート６５、６６が捲回された際に、第１切り欠き部７４ａが周方向において概ね揃うように、切り欠き７４が設けられる位置や、切り欠き７４の形状が設定されている。なお、この実施形態では、第１切り欠き部７４ａは、捲回された際の周方向に沿って幅を有するこのため、第１切り欠き部７４ａの位置が周方向において若干ずれた場合でも、当該第１切り欠き部７４ａの位置が合った部位が形成される。 In this embodiment, among the cutouts 74 formed in the third sheets 65 and 66, the first cutout portion 74a cut out in the longitudinal direction at the center portion in the width direction is the third sheet 65 and 66. The position where the notch 74 is provided and the shape of the notch 74 are set so that the first notch 74a is substantially aligned in the circumferential direction when the is wound. In this embodiment, since the first cutout portion 74a has a width along the circumferential direction when wound, even when the position of the first cutout portion 74a is slightly shifted in the circumferential direction, A portion where the position of the first notch 74a is aligned is formed.

また、この実施形態では、正極シート１１の未塗工部１１ｂに挟まれた第１シート６１には、アルミニウム箔が用いられており、負極シート１３の未塗工部１３ｂに挟まれた第１シート６２には銅箔が用いられている。また、第２シート６３、６４及び第３シート６５、６６は、帯状セパレータ１２、１４と同様にポリプロピレン製の微多孔膜が用いられている。なお、第１シート６１、６２、第２シート６３、６４、第３シート６５、６６の材料は、上記に限定されない。 In this embodiment, aluminum foil is used for the first sheet 61 sandwiched between the uncoated portions 11 b of the positive electrode sheet 11, and the first sheet 61 sandwiched between the uncoated portions 13 b of the negative electrode sheet 13. Copper foil is used for the sheet 62. In addition, the second sheets 63 and 64 and the third sheets 65 and 66 are made of a polypropylene microporous film similarly to the strip separators 12 and 14. The materials of the first sheets 61 and 62, the second sheets 63 and 64, and the third sheets 65 and 66 are not limited to the above.

図３は、捲回電極体１２０について、第１シート６１、６２と第２シート６３、６４と第３シート６５、６６が重ねられ、捲回された状態を示す、捲回軸方向の縦断面図である。 FIG. 3 is a longitudinal sectional view in the winding axis direction showing the wound electrode body 120 in a state where the first sheets 61 and 62, the second sheets 63 and 64, and the third sheets 65 and 66 are overlapped and wound. FIG.

正極シート１１の未塗工部１１ｂに挟まれた、第１シート６１と第２シート６３と第３シート６５は、図３に示すように、それぞれ同じ厚さに設定されている。この実施形態では、第１シート６１と第２シート６３と第３シート６５は、それぞれ負極シート１３と、２枚の帯状セパレータ１２、１４と、正極シート１１の両面に塗工された正極活物質１１ａとを合わせた厚さに設定されている。すなわち、負極シート１３の厚さをＡ１、２枚の帯状セパレータ１２、１４の厚さをそれぞれＢ１、Ｂ２とし、正極シート１１の両面に塗工された正極活物質１１ａの厚さをＣ１、Ｃ２とした場合、第１シート６１と第２シート６３と第３シート６５の厚さＴ１は、Ｔ１＝Ａ１＋Ｂ１＋Ｂ２＋Ｃ１＋Ｃ２になるように設定されている。このように厚さを設定することによって、第１シート６１と第２シート６３と第３シート６５が正極シート１１の未塗工部１１ｂの間に適切に収まる。 As shown in FIG. 3, the first sheet 61, the second sheet 63, and the third sheet 65 sandwiched between the uncoated portions 11b of the positive electrode sheet 11 are set to have the same thickness. In this embodiment, the first sheet 61, the second sheet 63, and the third sheet 65 are each made of a negative electrode sheet 13, two strip separators 12, 14, and a positive electrode active material coated on both surfaces of the positive electrode sheet 11. 11a is set to the total thickness. That is, the thickness of the negative electrode sheet 13 is A1, the thickness of the two strip separators 12 and 14 is B1 and B2, respectively, and the thickness of the positive electrode active material 11a applied on both surfaces of the positive electrode sheet 11 is C1 and C2. In this case, the thickness T1 of the first sheet 61, the second sheet 63, and the third sheet 65 is set to satisfy T1 = A1 + B1 + B2 + C1 + C2. By setting the thickness in this way, the first sheet 61, the second sheet 63, and the third sheet 65 are appropriately accommodated between the uncoated portions 11 b of the positive electrode sheet 11.

また、負極シート１３の未塗工部１３ｂに挟まれた、第１シート６２と第２シート６４と第３シート６６は、それぞれ同じ厚さに設定されている。この実施形態では、第１シート６２と第２シート６４と第３シート６６は、それぞれ正極シート１１と、２枚の帯状セパレータ１２、１４と、負極シート１３の両面に塗工された負極活物質１３ａとを合わせた厚さに設定されている。すなわち、正極シート１１の厚さをＡ２、２枚の帯状セパレータ１２、１４の厚さをそれぞれＢ１、Ｂ２とし、負極シート１３の両面に塗工された負極活物質１３ａの厚さをそれぞれＤ１、Ｄ２とした場合、第１シート６２と第２シート６４と第３シート６６の厚さＴ２は、Ｔ２＝Ａ２＋Ｂ１＋Ｂ２＋Ｄ１＋Ｄ２になるように設定されている。このように厚さを設定することによって、第１シート６２と第２シート６４と第３シート６６が負極シート１３の未塗工部１３ｂの間に適切に収まる。 Moreover, the 1st sheet 62, the 2nd sheet | seat 64, and the 3rd sheet | seat 66 pinched | interposed into the uncoated part 13b of the negative electrode sheet 13 are each set to the same thickness. In this embodiment, the first sheet 62, the second sheet 64, and the third sheet 66 are the negative electrode active material coated on both surfaces of the positive electrode sheet 11, the two strip separators 12 and 14, and the negative electrode sheet 13, respectively. The total thickness is set to 13a. That is, the thickness of the positive electrode sheet 11 is A2, the thickness of the two strip separators 12 and 14 is B1 and B2, respectively, and the thickness of the negative electrode active material 13a applied to both surfaces of the negative electrode sheet 13 is D1, When D2 is set, the thickness T2 of the first sheet 62, the second sheet 64, and the third sheet 66 is set to satisfy T2 = A2 + B1 + B2 + D1 + D2. By setting the thickness in this way, the first sheet 62, the second sheet 64, and the third sheet 66 are appropriately accommodated between the uncoated portions 13 b of the negative electrode sheet 13.

このように、この実施形態では、第１シート６１、６２と、第２シート６３、６４と、第３シート６５、６６の厚さが、それぞれ正極シート１１と負極シート１３と帯状セパレータ１２、１４の厚さに合わせて設定されている。このため、捲回電極体１２０の幅方向両側で、正極シート１１の未塗工部１１ｂと、負極シート１３の未塗工部１３ｂの間に、それぞれ第１シート６１、６２と、第２シート６３、６４と、第３シート６５、６６が挟まれる。正極シート１１の未塗工部１１ｂと、負極シート１３の未塗工部１３ｂは、かかる第１シート６１、６２と、第２シート６３、６４と、第３シート６５、６６によって補強される。このため、図４に示すように、捲回電極体１２０の捲回軸方向の端部が略円筒形状に捲回される。 Thus, in this embodiment, the thicknesses of the first sheet 61, 62, the second sheet 63, 64, and the third sheet 65, 66 are the positive electrode sheet 11, the negative electrode sheet 13, and the strip separators 12, 14, respectively. It is set according to the thickness. Therefore, on both sides in the width direction of the wound electrode body 120, between the uncoated portion 11b of the positive electrode sheet 11 and the uncoated portion 13b of the negative electrode sheet 13, the first sheets 61 and 62 and the second sheet, respectively. 63, 64 and the third sheets 65, 66 are sandwiched. The uncoated portion 11 b of the positive electrode sheet 11 and the uncoated portion 13 b of the negative electrode sheet 13 are reinforced by the first sheets 61 and 62, the second sheets 63 and 64, and the third sheets 65 and 66. For this reason, as shown in FIG. 4, the end of the wound electrode body 120 in the winding axis direction is wound into a substantially cylindrical shape.

また、この実施形態では、正極シート１１の未塗工部１１ｂの縁部と第１シート６１の縁部とは、捲回電極体１２０の捲回軸方向の片側の端面を構成している。この実施形態では、捲回電極体１２０の当該端面には、図１に示すように、正極側の電極板１２２が溶接されている。また、負極シート１３の未塗工部１３ｂの縁部と第１シート６２の縁部とは、捲回電極体１２０の捲回軸方向の反対側の端面を構成している。この実施形態では、捲回電極体１２０の当該端面には、負極側の電極板１２４が溶接されている。 In this embodiment, the edge of the uncoated portion 11 b of the positive electrode sheet 11 and the edge of the first sheet 61 constitute an end surface on one side of the wound electrode body 120 in the winding axis direction. In this embodiment, a positive electrode plate 122 is welded to the end face of the wound electrode body 120 as shown in FIG. Further, the edge of the uncoated portion 13 b of the negative electrode sheet 13 and the edge of the first sheet 62 constitute an end face on the opposite side of the wound electrode body 120 in the winding axis direction. In this embodiment, a negative electrode plate 124 is welded to the end face of the wound electrode body 120.

この実施形態では、かかる電極板１２２、１２４は、図５に示すように、捲回電極体１２０の端面に合わせた円板形状の部材であり、径方向に沿って複数本（図示例では、４本）の溶接ライン１２６を備えている。この実施形態では、図１に示すように、電極板１２２、１２４は捲回電極体１２０の端面（図４参照）に重ねられている。捲回電極体１２０の端面に現れる正極シート１１の未塗工部１１ｂの縁部に電極板１２２が溶接されている。また、捲回電極体１２０の端面に現れる負極シート１３の未塗工部１３ｂの縁部に電極板１２４が溶接されている。この場合、捲回電極体１２０の端面に正極シート１１の未塗工部１１ｂの縁部が現れる位置に合わせて、電極板１２２の溶接ライン１２６に沿って所定の間隔でレーザ溶接を行うとよい。同様に、捲回電極体１２０の端面に負極シート１３の未塗工部１３ｂの縁部が現れる位置に合わせて電極板１２４の溶接ライン１２６に沿って所定の間隔でレーザ溶接を行うとよい。図５中の符号１２６ａで示す部位は、レーザ溶接痕を図示している。 In this embodiment, as shown in FIG. 5, the electrode plates 122 and 124 are disk-shaped members that match the end surface of the wound electrode body 120, and a plurality of electrode plates (in the illustrated example, 4) welding lines 126 are provided. In this embodiment, as shown in FIG. 1, the electrode plates 122 and 124 are overlaid on the end face (see FIG. 4) of the wound electrode body 120. An electrode plate 122 is welded to the edge of the uncoated portion 11 b of the positive electrode sheet 11 that appears on the end face of the wound electrode body 120. Further, an electrode plate 124 is welded to the edge of the uncoated portion 13 b of the negative electrode sheet 13 that appears on the end face of the wound electrode body 120. In this case, laser welding may be performed at predetermined intervals along the welding line 126 of the electrode plate 122 in accordance with the position where the edge of the uncoated portion 11b of the positive electrode sheet 11 appears on the end face of the wound electrode body 120. . Similarly, laser welding may be performed at predetermined intervals along the welding line 126 of the electrode plate 124 in accordance with the position where the edge of the uncoated portion 13b of the negative electrode sheet 13 appears on the end face of the wound electrode body 120. A portion indicated by reference numeral 126a in FIG. 5 illustrates a laser welding mark.

捲回電極体１２０に正負の電極板１２２、１２４を溶接する際、スパッタ（塵）が発生するが、この実施形態では、正極シート１１の未塗工部１１ｂと負極シート１３の未塗工部１３ｂとには、図３に示すように、それぞれ第１シート６１、６２よりも幅方向の内側（捲回電極体１２０の捲回軸方向の内側）に間隔をあけて、多孔質性の第２シート６３、６４が挟まれている。上記スパッタは、かかる第２シート６３、６４によって、捲回電極体１２０の捲回軸方向のより内側に入るのが防止される。このため、捲回電極体１２０のうち、正極活物質１１ａや負極活物質１３ａが存在する部分には、スパッタが入らない。なお、上記スパッタでも、極小さいスパッタは、第２シート６３、６４よりも内側に入る可能性はある。しかしながら、第２シート６３、６４に採用する多孔質材料を適切に選択することによって、電池を機能させる際に不具合を生じさせるような大きさのスパッタが、第２シート６３、６４よりも内側に入るのを確実に防止できる。 Spatter (dust) is generated when the positive and negative electrode plates 122 and 124 are welded to the wound electrode body 120. In this embodiment, the uncoated portion 11b of the positive electrode sheet 11 and the uncoated portion of the negative electrode sheet 13 are generated. 3b, as shown in FIG. 3, the porous sheets are spaced apart from each other on the inner side in the width direction than the first sheets 61 and 62 (the inner side in the winding axis direction of the wound electrode body 120). Two sheets 63 and 64 are sandwiched. The sputtering is prevented from entering the winding electrode body 120 in the winding axis direction by the second sheets 63 and 64. For this reason, sputtering does not enter the portion of the wound electrode body 120 where the positive electrode active material 11a and the negative electrode active material 13a are present. Even in the above-described sputtering, there is a possibility that extremely small sputtering may enter the inside of the second sheets 63 and 64. However, by appropriately selecting the porous material used for the second sheets 63 and 64, spatters having such a size as to cause problems when the battery functions are caused to be inside the second sheets 63 and 64. It can be surely prevented from entering.

また、第１シート６１、６２と第２シート６３、６４との間には、図４に示すように、注液孔７２が形成されている。図４は、正極シート１１の未塗工部１１ｂに形成された注液孔７２を図示しているが、負極シート１３の未塗工部１３ｂにも同様に注液孔７２が形成されている（図１参照）。この実施形態では、注液孔７２は、図４に示すように、正極シート１１と負極シート１３を捲回後に、捲回電極体１２０の捲回径方向に穴をあけて形成している。この場合、注液孔７２は、ドリルなどの切削具を用いて形成するとよい。なお、注液孔７２をドリルなどの切削具を用いて形成する場合には、切削屑が生じる場合がある。 In addition, a liquid injection hole 72 is formed between the first sheets 61 and 62 and the second sheets 63 and 64 as shown in FIG. FIG. 4 illustrates the liquid injection hole 72 formed in the uncoated part 11 b of the positive electrode sheet 11, but the liquid injection hole 72 is similarly formed in the uncoated part 13 b of the negative electrode sheet 13. (See FIG. 1). In this embodiment, as shown in FIG. 4, the liquid injection hole 72 is formed by making a hole in the wound radial direction of the wound electrode body 120 after winding the positive electrode sheet 11 and the negative electrode sheet 13. In this case, the liquid injection hole 72 may be formed using a cutting tool such as a drill. In addition, when forming the liquid injection hole 72 using cutting tools, such as a drill, cutting waste may arise.

この実施形態では、捲回電極体１２０は、それぞれ注液孔７２が形成される部位よりも幅方向の内側に、多孔質性の第２シート６３、６４が挟まれている。このため、上記切削屑が第２シート６３、６４よりも内側に入るのが防止される。このように、第２シート６３、６４は、捲回電極体１２０のうち正極活物質１１ａや負極活物質１３ａが存在する部分に、スパッタや切削屑が入るのを防止する機能を奏する。また、第２シート６３、６４は多孔質性のシートで構成されているので、電解液は、捲回電極体１２０のうち正極活物質１１ａや負極活物質１３ａが存在する部分に入る。このように、第２シート６３、６４は、上述したように、スパッタや切削屑が捲回電極体１２０のうち正極活物質１１ａや負極活物質１３ａが存在する部分に入るのを適切に防止し、電解液の流通は阻害しない程度に目の粗い多孔質の材料を選択するとよい。 In this embodiment, the wound electrode body 120 has porous second sheets 63 and 64 sandwiched between the portions where the liquid injection holes 72 are formed, in the width direction. For this reason, the cutting waste is prevented from entering the second sheets 63 and 64. Thus, the 2nd sheets 63 and 64 have a function which prevents that a sputter | spatter and cutting waste enter into the part in which the positive electrode active material 11a and the negative electrode active material 13a exist among the winding electrode bodies 120. FIG. In addition, since the second sheets 63 and 64 are formed of a porous sheet, the electrolytic solution enters a portion of the wound electrode body 120 where the positive electrode active material 11a and the negative electrode active material 13a are present. Thus, as described above, the second sheets 63 and 64 appropriately prevent spatter and cutting waste from entering the portion of the wound electrode body 120 where the positive electrode active material 11a and the negative electrode active material 13a are present. It is preferable to select a porous material that is coarse enough not to hinder the flow of the electrolyte.

また、この実施形態では、第１シート６１、６２と第２シート６３、６４との間に、注液孔７２が形成される部位に予め切り欠き７４が形成された第３シート６５、６６を有している。この実施形態では、第３シート６５、６６に形成された切り欠き７４のうち、幅方向中央部を長さ方向に沿って切り欠かれた第１切り欠き部７４ａは、第３シート６５、６６が捲回された際に、第１切り欠き部７４ａが周方向において揃うように、切り欠き７４が設けられる位置や、切り欠き７４の形状が設定されている。 Further, in this embodiment, the third sheets 65 and 66 in which a notch 74 is formed in advance at the site where the liquid injection hole 72 is formed between the first sheets 61 and 62 and the second sheets 63 and 64 are provided. Have. In this embodiment, among the cutouts 74 formed in the third sheets 65 and 66, the first cutout portion 74a cut out in the longitudinal direction at the center portion in the width direction is the third sheet 65 and 66. The position where the notch 74 is provided and the shape of the notch 74 are set so that the first notch 74a is aligned in the circumferential direction when the is wound.

この場合、注液孔７２が形成される部位が、かかる第３シート６５、６６によって補強されている。このため、注液孔７２を形成する際に、正極シート１１や負極シート１３がよれるのを防止でき、注液孔７２の形成が容易に行える。また、第３シート６５、６６に形成された切り欠き７４は、注液孔７２が形成される第１切り欠き部７４ａと、第２シート６３、６４が形成された側の縁に切り欠いた第２切り欠き部７４ｂを有している。このため、注液孔７２を通じて入る電解液は、第２切り欠き部７４ｂを通じて、第２シート６３、６４の方に導かれ、第２シート６３、６４を通じて帯状集電体３１、４１の間に入ることができる。 In this case, the portion where the liquid injection hole 72 is formed is reinforced by the third sheets 65 and 66. For this reason, when forming the liquid injection hole 72, it can prevent that the positive electrode sheet 11 and the negative electrode sheet 13 twist, and the liquid injection hole 72 can be formed easily. Further, the notches 74 formed in the third sheets 65 and 66 were cut out at the first notch portion 74a where the liquid injection hole 72 was formed and the edge on the side where the second sheets 63 and 64 were formed. It has the 2nd notch part 74b. For this reason, the electrolytic solution entering through the liquid injection hole 72 is guided to the second sheets 63 and 64 through the second notch 74b, and between the strip-shaped current collectors 31 and 41 through the second sheets 63 and 64. I can enter.

また、この実施形態では、第３シート６５、６６に形成された切り欠き７４は、注液孔７２が形成される部位から第２シート６３、６４が形成される側の縁に開いている。このように注液孔７２の周りにかかる切り欠き７４を設けることによって、当該切り欠き７４を通じて、捲回電極体１２０のうち正極活物質１１ａや負極活物質１３ａが存在する部分に適切に電解液を導入することができる。例えば、図４に示すように、電解液は、注液孔７２に沿って捲回径方向に捲回電極体１２０に入っていく（図４中の矢印Ｉ）。また、電解液は、捲回電極体１２０の捲回層毎に第３シート６５、６６に形成された切り欠き７４に沿って流れる（図４中の矢印II、III）。この実施形態では、切り欠き７４は、注液孔７２が形成される部位から第２シート６３、６４が形成される側の縁に開いているので、捲回電極体１２０の捲回層毎に電解液が供給される。 Further, in this embodiment, the notches 74 formed in the third sheets 65 and 66 are opened from the portion where the liquid injection hole 72 is formed to the edge on the side where the second sheets 63 and 64 are formed. Thus, by providing the notch 74 around the liquid injection hole 72, the electrolyte solution is appropriately applied to the portion of the wound electrode body 120 where the positive electrode active material 11 a and the negative electrode active material 13 a exist through the notch 74. Can be introduced. For example, as shown in FIG. 4, the electrolytic solution enters the wound electrode body 120 in the wound radial direction along the injection hole 72 (arrow I in FIG. 4). Further, the electrolytic solution flows along the notches 74 formed in the third sheets 65 and 66 for each wound layer of the wound electrode body 120 (arrows II and III in FIG. 4). In this embodiment, the notch 74 is opened from the portion where the injection hole 72 is formed to the edge on the side where the second sheets 63 and 64 are formed, so that the notch 74 is provided for each wound layer of the wound electrode body 120. An electrolyte is supplied.

以上のように、かかる電池１００によれば、図１に示すように、捲回電極体１２０のうち、正極シート１１の未塗工部１１ｂと負極シート１３の未塗工部１３ｂとの縁部には、それぞれ導電性の第１シート６１、６２が挟まれた状態で巻き取られている。また、正極シート１１の未塗工部１１ｂと負極シート１３の未塗工部１３ｂとには、それぞれ第１シート６１、６２よりも幅方向の内側に間隔をあけて、多孔質性の第２シート６３、６４が挟まれた状態で巻き取られている。そして、第１シート６１、６２と第２シート６３、６４の間において、未塗工部１１ｂ、１３ｂに注液孔７２が形成されている。これにより、電解液は、注液孔７２及び第２シート６３、６４を通じて捲回電極体１２０の内部に入る。また、捲回電極体１２０の捲回軸方向の端面に電極板を溶接する場合に生じるスパッタや、注液孔７２を形成する際の切削屑を第２シート６３、６４で遮断することができ、捲回電極体１２０の内部に異物が入るのを防止できる。 As described above, according to the battery 100, as shown in FIG. 1, the edge portion between the uncoated portion 11 b of the positive electrode sheet 11 and the uncoated portion 13 b of the negative electrode sheet 13 in the wound electrode body 120. Are wound in a state in which the first conductive sheets 61 and 62 are sandwiched, respectively. In addition, the uncoated portion 11b of the positive electrode sheet 11 and the uncoated portion 13b of the negative electrode sheet 13 are spaced from each other on the inner side in the width direction with respect to the first sheets 61 and 62, respectively. The sheets 63 and 64 are wound in a sandwiched state. And between the 1st sheets 61 and 62 and the 2nd sheets 63 and 64, the liquid injection hole 72 is formed in the uncoated parts 11b and 13b. As a result, the electrolyte enters the wound electrode body 120 through the injection hole 72 and the second sheets 63 and 64. Further, the second sheet 63, 64 can block the spatter generated when the electrode plate is welded to the end surface in the winding axis direction of the wound electrode body 120 and the cutting waste when forming the liquid injection hole 72. , Foreign matter can be prevented from entering the wound electrode body 120.

また、正極シート１１の未塗工部１１ｂと負極シート１３の未塗工部１３ｂの縁部には、導電性の第１シート６１、６２が挟まれた状態で捲回されているので、当該縁部が補強されている。このため、それぞれ電極板１２２、１２４を溶接する場合に、捲回電極体１２０の端部が崩れることがない。また、溶接の際に生じるスパッタが第２シート６３、６４によって遮断されて、捲回電極体１２０の内部に入らないので、正極シート１１の未塗工部１１ｂと負極シート１３の未塗工部１３ｂの縁部に電極板１２２、１２４を溶接しても不具合が生じ難い。なお、上述した実施形態では、捲回電極体１２０の端部に溶接される電極端子として、板状の電極板１２２、１２４を例示したが、捲回電極体１２０の端部に溶接される電極端子は、かかる板状の部材に限定されない。 Moreover, since the electroconductive 1st sheet | seats 61 and 62 are wound in the edge part of the uncoated part 11b of the positive electrode sheet 11, and the uncoated part 13b of the negative electrode sheet 13, the said The edges are reinforced. For this reason, when welding the electrode plates 122 and 124 respectively, the edge part of the wound electrode body 120 does not collapse. Further, since spatter generated during welding is blocked by the second sheets 63 and 64 and does not enter the wound electrode body 120, the uncoated portion 11 b of the positive electrode sheet 11 and the uncoated portion of the negative electrode sheet 13 Even if the electrode plates 122 and 124 are welded to the edge of 13b, it is difficult to cause problems. In the above-described embodiment, the plate-like electrode plates 122 and 124 are exemplified as the electrode terminals welded to the end portion of the wound electrode body 120. However, the electrodes welded to the end portion of the wound electrode body 120 are exemplified. The terminal is not limited to such a plate-like member.

以上、本発明の一実施形態に係る電池１００を説明したが、本発明は、上述した実施形態に限定されない。 The battery 100 according to the embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment.

例えば、図６に示す形態では、第１シート６１、６２と第２シート６３、６４との間に注液孔７２を形成するとともに、第１シート６１、６２と第２シート６３、６４の間隔を狭めている。この場合、第１シート６１、６２と第２シート６３、６４との間に、第３シート６５、６６（図４参照）を配設していないが、注液孔７２を形成する際に、捲回電極体１２０の端部の形状は保持される。このように、第３シート６５、６６（図４参照）を省略することもできる。 For example, in the form shown in FIG. 6, the liquid injection hole 72 is formed between the first sheets 61 and 62 and the second sheets 63 and 64, and the distance between the first sheets 61 and 62 and the second sheets 63 and 64 Is narrowing. In this case, the third sheets 65 and 66 (see FIG. 4) are not disposed between the first sheets 61 and 62 and the second sheets 63 and 64, but when the liquid injection hole 72 is formed, The shape of the end of the wound electrode body 120 is maintained. Thus, the third sheets 65 and 66 (see FIG. 4) can be omitted.

また、上記の実施形態では、リチウムイオン二次電池について例示したが、本発明にかかる電池の構造は、リチウムイオン二次電池のみならず、他の電池にも適用できる。 In the above embodiment, the lithium ion secondary battery is exemplified, but the battery structure according to the present invention can be applied not only to the lithium ion secondary battery but also to other batteries.

また、本発明によれば、捲回電極体１２０の内部に異物の混入を防止できるとともに、捲回電極体１２０の内部に電解液が浸み込み易い。かかる構成によって、電池１００の性能を向上させることができる。かかる電池は、例えば、図７に示すように、高出力で、長寿命であることが特に求められる車両１（典型的には自動車、特にハイブリッド自動車、電気自動車、燃料電池自動車のような電動機を備える自動車）に搭載される電池１０００として、特に好適である。 In addition, according to the present invention, foreign matter can be prevented from entering the wound electrode body 120, and the electrolytic solution can easily penetrate into the wound electrode body 120. With this configuration, the performance of the battery 100 can be improved. For example, as shown in FIG. 7, such a battery is a vehicle 1 (typically an electric motor such as an automobile, particularly a hybrid automobile, an electric automobile, or a fuel cell automobile) that is particularly required to have a high output and a long life. It is particularly suitable as the battery 1000 to be mounted on an automobile equipped with the vehicle.

１車両
１１正極シート
１１ａ正極活物質
１１ｂ未塗工部
１２、１４帯状セパレータ
１３負極シート
１３ａ負極活物質
１３ｂ未塗工部
３１帯状集電体
４１帯状集電体
６１、６２第１シート
６３、６４第２シート
６５、６６第３シート
７２注液孔
７４切り欠き
７４ａ第１切り欠き部
７４ｂ第２切り欠き部
１００電池
１１０電池ケース
１１２捲回軸
１１４封止キャップ
１２０捲回電極体
１２２、１２４電極板
１２６溶接ライン
１２６ａレーザ溶接痕
１０００電池 DESCRIPTION OF SYMBOLS 1 Vehicle 11 Positive electrode sheet 11a Positive electrode active material 11b Uncoated part 12, 14 Strip-shaped separator 13 Negative electrode sheet 13a Negative electrode active material 13b Uncoated part 31 Band-shaped collector 41 Band-shaped collectors 61, 62 First sheets 63, 64 Second sheet 65, 66 Third sheet 72 Injection hole 74 Notch 74a First notch 74b Second notch 100 Battery 110 Battery case 112 Winding shaft 114 Sealing cap 120 Winding electrode body 122, 124 Electrode Plate 126 Welding line 126a Laser welding mark 1000 Battery

Claims

A wound electrode body in which a positive electrode sheet and a negative electrode sheet are overlapped and wound in a state of interposing a strip-shaped separator, and a battery in which an electrolytic solution is housed in a battery case,
The positive electrode sheet has a strip-shaped current collector, and a positive electrode active material applied to both surfaces of the strip-shaped current collector, biased to one side in the width direction of the strip-shaped current collector,
The negative electrode sheet has a strip-shaped current collector, and a negative electrode active material applied to both surfaces of the strip-shaped current collector, biased to one side in the width direction of the strip-shaped current collector,
The positive electrode active material and the negative electrode active material face each other with the strip separator interposed therebetween,
Of the positive electrode sheet, the uncoated portion where the positive electrode active material is not applied protrudes from one side in the width direction of the strip separator,
Of the negative electrode sheet, the uncoated portion where the negative electrode active material is not coated protrudes from the opposite side in the width direction of the strip separator,
The edges of the uncoated portion of the positive electrode sheet and the uncoated portion of the negative electrode sheet are wound in a state in which a conductive first sheet is sandwiched between them,
Between the uncoated part of the positive electrode sheet and the uncoated part of the negative electrode sheet, a porous second sheet was sandwiched between the first sheet and the inner side in the width direction. Rolled up in a state,
A battery having a liquid injection hole in the uncoated part between the first sheet and the second sheet.

The first sheet and the second sheet sandwiched between the uncoated portions of the positive electrode sheet include the negative electrode sheet, the two strip-shaped separators, and the positive electrode active material applied to both surfaces of the positive electrode sheet. It is set to the combined thickness,
The first sheet and the second sheet sandwiched between uncoated portions of the negative electrode sheet include the positive electrode sheet, the two strip separators, and the negative electrode active material coated on both surfaces of the negative electrode sheet. The battery according to claim 1, wherein the battery is set to a combined thickness.

3. The battery according to claim 1, further comprising a third sheet in which a notch is formed in advance at a portion where a liquid injection hole is formed between the first sheet and the second sheet.

4. The battery according to claim 3, wherein the notch formed in the third sheet is opened from an area where a liquid injection hole is formed to an edge on a side where the second sheet is formed. 5.

The thickness of the third sheet sandwiched between uncoated portions of the positive electrode sheet is a combination of the negative electrode sheet, the two strip-shaped separators, and the positive electrode active material applied to both surfaces of the positive electrode sheet. Is set to
The thickness of the third sheet sandwiched between the uncoated portions of the negative electrode sheet is a combination of the positive electrode sheet, the two strip-shaped separators, and the negative electrode active material applied to both surfaces of the negative electrode sheet. The battery according to claim 3 or 4, wherein the battery is set as follows.

The battery according to any one of claims 1 to 5, wherein electrode terminals are welded to edges of the uncoated portion of the positive electrode sheet and the uncoated portion of the negative electrode sheet, respectively.

A vehicle equipped with the battery according to any one of claims 1 to 6.

A wound electrode body in which a positive electrode sheet and a negative electrode sheet are wound in a state of interposing a strip-shaped separator,
The positive electrode sheet has a strip-shaped current collector, and a positive electrode active material applied to both surfaces of the strip-shaped current collector, biased to one side in the width direction of the strip-shaped current collector,
The negative electrode sheet has a strip-shaped current collector, and a negative electrode active material applied to both surfaces of the strip-shaped current collector, biased to one side in the width direction of the strip-shaped current collector,
The positive electrode active material and the negative electrode active material face each other with the strip separator interposed therebetween,
Of the positive electrode sheet, the uncoated portion where the positive electrode active material is not applied protrudes from one side in the width direction of the strip separator,
Of the negative electrode sheet, the uncoated portion where the negative electrode active material is not coated protrudes from the opposite side in the width direction of the strip separator,
The edges of the uncoated portion of the positive electrode sheet and the uncoated portion of the negative electrode sheet are wound in a state in which a conductive first sheet is sandwiched between them,
Between the uncoated part of the positive electrode sheet and the uncoated part of the negative electrode sheet, a porous second sheet was sandwiched between the first sheet and the inner side in the width direction. Rolled up in a state,
A wound electrode body having a liquid injection hole in the uncoated part between the first sheet and the second sheet.