JP2019175689A - Power storage device - Google Patents
Power storage device Download PDFInfo
- Publication number
- JP2019175689A JP2019175689A JP2018062743A JP2018062743A JP2019175689A JP 2019175689 A JP2019175689 A JP 2019175689A JP 2018062743 A JP2018062743 A JP 2018062743A JP 2018062743 A JP2018062743 A JP 2018062743A JP 2019175689 A JP2019175689 A JP 2019175689A
- Authority
- JP
- Japan
- Prior art keywords
- lid
- plate portion
- tab group
- case
- electrode assembly
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003860 storage Methods 0.000 title claims abstract description 20
- 210000001503 joint Anatomy 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 4
- 238000009413 insulation Methods 0.000 abstract description 12
- 238000003475 lamination Methods 0.000 abstract description 5
- 239000002243 precursor Substances 0.000 description 12
- 239000011888 foil Substances 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 238000003466 welding Methods 0.000 description 8
- 238000005304 joining Methods 0.000 description 7
- 238000000605 extraction Methods 0.000 description 4
- 239000007773 negative electrode material Substances 0.000 description 4
- 239000007774 positive electrode material Substances 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
本発明は、タブ群が電極の積層方向の一端側で寄せ集められるとともに他端側に向けて折り曲げられている蓄電装置に関する。 The present invention relates to a power storage device in which a tab group is gathered on one end side in the stacking direction of electrodes and bent toward the other end side.
従来から、EV(Electric Vehicle)やPHV(Plug in Hybrid Vehicle)などの車両には、走行用モータへの供給電力を蓄える蓄電装置としてリチウムイオン二次電池やニッケル水素二次電池などが搭載されている。二次電池は、シート状の正極電極及び負極電極が絶縁された状態で積層された電極組立体と、電極組立体を収容するケースとを備える。電極組立体は、正極電極の一辺から突出した正極タブが積層された正極タブ群と、負極電極の一辺から突出した負極タブが積層された負極タブ群とを有する。ケースは、有底筒状のケース本体と、ケース本体の開口部を閉塞する蓋とを有する。二次電池は、電極組立体と電気を授受する各極性の電極端子と、同じ極性のタブ群と電極端子とを電気的に接続する各極性の導電部材とを備える。 Conventionally, vehicles such as EVs (Electric Vehicles) and PHVs (Plug in Hybrid Vehicles) have been mounted with lithium-ion secondary batteries, nickel-hydrogen secondary batteries, etc. as power storage devices that store the power supplied to the motor for travel. Yes. The secondary battery includes an electrode assembly that is laminated in a state where a sheet-like positive electrode and a negative electrode are insulated, and a case that houses the electrode assembly. The electrode assembly includes a positive electrode tab group in which positive electrode tabs protruding from one side of the positive electrode are stacked, and a negative electrode tab group in which negative electrode tabs protruding from one side of the negative electrode are stacked. The case includes a bottomed cylindrical case body and a lid that closes an opening of the case body. The secondary battery includes an electrode terminal of each polarity that exchanges electricity with the electrode assembly, and a conductive member of each polarity that electrically connects the tab group having the same polarity and the electrode terminal.
特許文献1に開示の二次電池では、タブ群は、電極の積層方向の一端側で寄せ集められるとともに積層方向の他端側に向けて折り曲げられている。また、導電部材は、タブ群が存在する電極組立体のタブ側端面と蓋の内面との間に配置される。導電部材は、蓋の内面に沿って配置される第1板部と、第1板部における積層方向の他端側に位置する縁部から電極組立体に向けて延出する第2板部と、第2板部の縁部から積層方向の一端側に向けて延出する第3板部とを備える。第1板部は、電極端子と接合された端子接合部を有する。第2板部は、タブ群を積層方向の他端側から覆う。第3板部は、タブ群を電極組立体側から覆うとともに、タブ群と接合された電極接合部を有する。 In the secondary battery disclosed in Patent Document 1, the tab group is gathered on one end side in the stacking direction of the electrodes and is bent toward the other end side in the stacking direction. The conductive member is disposed between the tab-side end surface of the electrode assembly where the tab group exists and the inner surface of the lid. The conductive member includes a first plate portion disposed along the inner surface of the lid, and a second plate portion extending toward the electrode assembly from an edge located on the other end side in the stacking direction of the first plate portion. And a third plate portion extending from the edge portion of the second plate portion toward one end side in the stacking direction. The first plate portion has a terminal joint portion joined to the electrode terminal. The second plate portion covers the tab group from the other end side in the stacking direction. The third plate portion covers the tab group from the electrode assembly side and has an electrode joint portion joined to the tab group.
このような二次電池では、積層方向の他端側において、タブ群は、導電部材の第2板部によって覆われているため、ケース本体と接触しない構成となっている。一方、積層方向の一端側では、タブ群とケース本体とが接触し、短絡する虞がある。 In such a secondary battery, since the tab group is covered with the second plate portion of the conductive member on the other end side in the stacking direction, it is configured not to contact the case main body. On the other hand, on one end side in the stacking direction, the tab group and the case main body may come into contact with each other and short circuit.
本発明は、上記課題を解決するためになされたものであり、その目的は、タブ群とケースとを絶縁できる蓄電装置を提供することにある。 The present invention has been made to solve the above problems, and an object of the present invention is to provide a power storage device that can insulate a tab group from a case.
上記問題点を解決するための蓄電装置は、電極が積層され、かつ前記電極から突出したタブが積層されたタブ群を有する電極組立体と、前記電極組立体を収容するケース本体、及び前記ケース本体の開口部を閉塞する蓋を有するケースと、前記電極組立体と電気を授受する電極端子と、前記タブ群が存在する前記電極組立体のタブ側端面と前記蓋との間に配置され、前記電極端子と接合される端子接合部、及び前記タブ群が接合される電極接合部を有する導電部材と、前記端子接合部と前記蓋との間に配置され、前記端子接合部と前記蓋とを絶縁する蓋側絶縁部を有する絶縁部材と、を備え、前記タブ群は、前記電極の積層方向の一端側で寄せ集められるとともに前記積層方向の他端側に向けて折り曲げられている蓄電装置であって、前記導電部材は、前記端子接合部を有するとともに、前記蓋の内面に沿って配置される第1板部と、前記第1板部から前記電極組立体に向けて延出するとともに、前記積層方向の他端側から前記タブ群を覆い、かつ前記ケース本体から離間した第2板部と、前記第2板部から前記積層方向の一端側に向けて延出するとともに、前記タブ群を前記電極組立体側から覆い、かつ前記電極接合部を有する第3板部と、を備え、前記絶縁部材は、前記蓋側絶縁部から前記電極組立体に向けて延出するとともに、前記積層方向の一端側から前記タブ群を覆い、前記タブ群と前記ケース本体とを絶縁するケース側絶縁部を有することを要旨とする。 A power storage device for solving the above problems includes an electrode assembly having a tab group in which electrodes are stacked and tabs protruding from the electrodes are stacked, a case main body that houses the electrode assembly, and the case A case having a lid for closing the opening of the main body, an electrode terminal for transferring electricity to and from the electrode assembly, and a tab-side end surface of the electrode assembly in which the tab group exists, and the lid, A conductive member having a terminal joint portion joined to the electrode terminal, and an electrode joint portion joined to the tab group, and is arranged between the terminal joint portion and the lid, and the terminal joint portion and the lid And an insulating member having a lid-side insulating portion that insulates the power storage device, wherein the tab group is gathered together on one end side in the stacking direction of the electrodes and bent toward the other end side in the stacking direction And the guide The member includes the terminal joint portion, a first plate portion disposed along the inner surface of the lid, the member extending from the first plate portion toward the electrode assembly, and other members in the stacking direction. A second plate portion covering the tab group from the end side and spaced from the case body; and extending from the second plate portion toward one end side in the stacking direction, and the tab group is disposed on the electrode assembly side And the third plate portion having the electrode joint portion, and the insulating member extends from the lid-side insulating portion toward the electrode assembly and from the one end side in the stacking direction. The gist is to have a case-side insulating portion that covers the tab group and insulates the tab group and the case body.
これによれば、積層方向の一端側において、タブ群は、絶縁部材のケース側絶縁部によって覆われるため、ケース本体の内面と絶縁される。また、積層方向の他端側において、タブ群は、導電部材の第2板部によって覆われ、第2板部はケース本体と離間しているため、タブ群はケース本体の内面と接触しない。よって、ケース側絶縁部と第2板部とによってタブ群とケースとを絶縁できる。 According to this, on one end side in the stacking direction, the tab group is covered with the case-side insulating portion of the insulating member, so that it is insulated from the inner surface of the case body. Further, on the other end side in the stacking direction, the tab group is covered by the second plate portion of the conductive member, and the second plate portion is separated from the case main body, so that the tab group does not contact the inner surface of the case main body. Therefore, the tab group and the case can be insulated by the case-side insulating portion and the second plate portion.
また、上記蓄電装置について、前記蓋側絶縁部からの前記ケース側絶縁部の延出方向において、前記ケース側絶縁部の先端部は、前記電極組立体のタブ側端面と前記第3板部の下面との間に位置するのが好ましい。 In the power storage device, in the extending direction of the case-side insulating portion from the lid-side insulating portion, the tip end portion of the case-side insulating portion is formed between the tab-side end surface of the electrode assembly and the third plate portion. It is preferably located between the lower surface.
これによれば、電極組立体が蓋側に移動しようとしても、ケース側絶縁部の先端部がタブ側端面と接触することで、蓋側への電極組立体の位置ずれを規制できる。
また、上記蓄電装置について、前記第1板部は、矩形板状であり、前記端子接合部は、前記第1板部の長手方向の一端部であり、前記蓋側絶縁部は、前記第1板部の長手方向の他端部と前記蓋との間に配置されるのが好ましい。
According to this, even if the electrode assembly is about to move to the lid side, the positional deviation of the electrode assembly toward the lid side can be restricted by the tip portion of the case-side insulating portion coming into contact with the tab-side end surface.
In the power storage device, the first plate portion is a rectangular plate shape, the terminal joint portion is one end portion in the longitudinal direction of the first plate portion, and the lid-side insulating portion is the first insulating portion. It is preferable to arrange | position between the other end part of the longitudinal direction of a board part, and the said lid | cover.
これによれば、第1板部の長手方向の一端部と蓋との絶縁に加えて、第1板部の長手方向の他端部と蓋との絶縁も確保できる。
また、上記蓄電装置について、前記ケース側絶縁部は、前記第1板部の長手方向全体と前記ケース本体との間に配置されるのが好ましい。
According to this, in addition to the insulation between the one end portion in the longitudinal direction of the first plate portion and the lid, the insulation between the other end portion in the longitudinal direction of the first plate portion and the lid can be secured.
Moreover, about the said electrical storage apparatus, it is preferable that the said case side insulation part is arrange | positioned between the whole longitudinal direction of the said 1st board part, and the said case main body.
これによれば、タブ群とケース本体との絶縁に加えて、第1板部の長手方向全体とケース本体との絶縁も確保できる。また、電極組立体が蓋側に移動しようとした際に、ケース側絶縁部の先端部においてタブ側端面と接触する面積が大きくなるため、蓋側への電極組立体の位置ずれをより規制できる。 According to this, in addition to the insulation between the tab group and the case main body, the insulation between the entire longitudinal direction of the first plate portion and the case main body can be secured. In addition, when the electrode assembly is about to move to the lid side, the contact area with the tab-side end surface at the tip of the case-side insulating portion is increased, so that the displacement of the electrode assembly to the lid side can be further regulated. .
本発明によれば、タブ群とケースとを絶縁できる。 According to the present invention, the tab group and the case can be insulated.
以下、蓄電装置を二次電池に具体化した一実施形態を図1〜図4にしたがって説明する。
図1に示すように、蓄電装置としての二次電池10は、ケース11と、電極組立体12と、図示しない電解液とを備える。電極組立体12及び電解液は、ケース11に収容される。ケース11は、直方体状のケース本体13と、ケース本体13の開口部13aを閉塞する矩形平板状の蓋14とを有する。ケース本体13は、矩形板状の底壁13bと、底壁13bの一対の長側縁部から立設された長側壁13cと、底壁13bの一対の短側縁部から立設された短側壁13dとを有する。蓋14は、ケース11の壁部の一面を構成している。蓋14において、ケース11の内側に臨む面を内面14aとし、ケース11の外側に臨む面を外面14bとする。ケース11を構成するケース本体13と蓋14は、何れも金属製(例えば、ステンレスやアルミニウム)である。また、本実施形態の二次電池10は、その外観が角型をなす角型電池である。また、本実施形態の二次電池10は、リチウムイオン電池である。
Hereinafter, an embodiment in which the power storage device is embodied as a secondary battery will be described with reference to FIGS.
As shown in FIG. 1, a secondary battery 10 as a power storage device includes a case 11, an electrode assembly 12, and an electrolyte solution (not shown). The electrode assembly 12 and the electrolytic solution are accommodated in the case 11. The case 11 includes a rectangular parallelepiped case main body 13 and a rectangular flat lid 14 that closes the opening 13 a of the case main body 13. The case body 13 includes a rectangular plate-like bottom wall 13b, a long side wall 13c erected from a pair of long side edges of the bottom wall 13b, and a short erection from a pair of short side edges of the bottom wall 13b. And a side wall 13d. The lid 14 constitutes one surface of the wall portion of the case 11. In the lid 14, a surface facing the inside of the case 11 is an inner surface 14 a and a surface facing the outer side of the case 11 is an outer surface 14 b. Both the case main body 13 and the lid 14 constituting the case 11 are made of metal (for example, stainless steel or aluminum). Further, the secondary battery 10 of the present embodiment is a prismatic battery whose appearance is square. Further, the secondary battery 10 of the present embodiment is a lithium ion battery.
図2に示すように、電極組立体12は、複数の矩形シート状の電極としての正極電極21と、電極としての負極電極22と、セパレータ23とを備える。電極組立体12は、正極電極21と負極電極22との間にセパレータ23を介在させ、かつ相互に絶縁させた状態で積層した層状構造を備える。本実施形態では、正極電極21及び負極電極22の長手方向は、蓋14の長手方向と一致する。また、正極電極21と負極電極22が積層される方向を積層方向とする。積層方向は、蓋14の短手方向と一致する。 As shown in FIG. 2, the electrode assembly 12 includes a positive electrode 21 as a plurality of rectangular sheet-like electrodes, a negative electrode 22 as an electrode, and a separator 23. The electrode assembly 12 has a layered structure in which separators 23 are interposed between the positive electrode 21 and the negative electrode 22 and are laminated in a mutually insulated state. In the present embodiment, the longitudinal directions of the positive electrode 21 and the negative electrode 22 coincide with the longitudinal direction of the lid 14. The direction in which the positive electrode 21 and the negative electrode 22 are stacked is defined as a stacking direction. The stacking direction coincides with the short direction of the lid 14.
正極電極21は、矩形シート状の正極金属箔(例えばアルミニウム箔)24と、正極金属箔24の両面に存在する正極活物質層25とを有する。正極電極21は、正極電極21の一辺である長縁部21aの一部から突出したタブとしての正極タブ26を有する。正極タブ26は、正極活物質層25が存在せず、正極金属箔24そのもので構成されている。負極電極22は、矩形シート状の負極金属箔(例えば銅箔)27と、負極金属箔27の両面に存在する負極活物質層28とを有する。負極電極22は、負極電極22の一辺である長縁部22aの一部から突出したタブとしての負極タブ29を有する。負極タブ29は、負極活物質層28が存在せず、負極金属箔27そのもので構成されている。 The positive electrode 21 has a rectangular sheet-like positive electrode metal foil (for example, aluminum foil) 24 and a positive electrode active material layer 25 present on both surfaces of the positive electrode metal foil 24. The positive electrode 21 has a positive electrode tab 26 as a tab protruding from a part of the long edge portion 21 a that is one side of the positive electrode 21. The positive electrode tab 26 does not include the positive electrode active material layer 25 and is formed of the positive electrode metal foil 24 itself. The negative electrode 22 includes a rectangular sheet-like negative electrode metal foil (for example, copper foil) 27 and a negative electrode active material layer 28 present on both surfaces of the negative electrode metal foil 27. The negative electrode 22 has a negative electrode tab 29 as a tab protruding from a part of the long edge portion 22 a that is one side of the negative electrode 22. The negative electrode tab 29 is composed of the negative electrode metal foil 27 itself without the negative electrode active material layer 28.
各正極電極21は、それぞれの正極タブ26が積層方向に沿って列状に配置されるように積層される。同様に、各負極電極22は、それぞれの負極タブ29が積層方向に沿って列状に配置されるように積層される。電極組立体12は、各正極タブ26が積層されたタブ群としての正極タブ群15(図1及び図3参照)と、各負極タブ29が積層されたタブ群としての負極タブ群16とを備える。電極組立体12において、正極タブ群15及び負極タブ群16が存在する端面をタブ側端面12aとする。電極組立体12は、タブ側端面12aを除く端面が絶縁シートFによって覆われることで、ケース本体13から絶縁される。 Each positive electrode 21 is laminated so that the respective positive electrode tabs 26 are arranged in a row along the lamination direction. Similarly, each negative electrode 22 is laminated so that the respective negative electrode tabs 29 are arranged in a line along the lamination direction. The electrode assembly 12 includes a positive electrode tab group 15 (see FIGS. 1 and 3) as a tab group in which the positive electrode tabs 26 are stacked, and a negative electrode tab group 16 as a tab group in which the negative electrode tabs 29 are stacked. Prepare. In the electrode assembly 12, an end face on which the positive electrode tab group 15 and the negative electrode tab group 16 are present is referred to as a tab side end face 12a. The electrode assembly 12 is insulated from the case body 13 by covering the end surface except the tab side end surface 12a with the insulating sheet F.
図2に示すように、正極タブ群15及び負極タブ群16は、基端側の部位が積層方向の一端側で寄せ集められるとともに積層方向の他端側に向けて屈曲された第1屈曲部15aと、第1屈曲部15aから積層方向に沿って延びる第1延在部15bと、積層方向の他端側から一端側に向けて屈曲された第2屈曲部15cと、第2屈曲部15cから延びる第2延在部15dを有する。第1延在部15bは、電極組立体12のタブ側端面12aと第2延在部15dとの間に位置する。 As shown in FIG. 2, the positive electrode tab group 15 and the negative electrode tab group 16 include a first bent portion in which a base end portion is gathered at one end side in the stacking direction and bent toward the other end side in the stacking direction. 15a, a first extending portion 15b extending from the first bent portion 15a along the stacking direction, a second bent portion 15c bent from the other end side to the one end side in the stacking direction, and a second bent portion 15c A second extending portion 15d extending from the second extending portion 15d. The first extending portion 15b is located between the tab side end surface 12a of the electrode assembly 12 and the second extending portion 15d.
図3に示すように、二次電池10は、正極タブ群15と、後述の正極端子構造17の一部とを電気的に接続するための導電部材としての正極導電部材19を備える。また、二次電池10は、負極タブ群16と、後述の負極端子構造18の一部とを電気的に接続するための導電部材としての負極導電部材20を備える。正極導電部材19及び負極導電部材20は、蓋14の内面14aと電極組立体12のタブ側端面12aとの間に配置される。 As shown in FIG. 3, the secondary battery 10 includes a positive electrode conductive member 19 as a conductive member for electrically connecting the positive electrode tab group 15 and a part of a positive electrode terminal structure 17 described later. Further, the secondary battery 10 includes a negative electrode conductive member 20 as a conductive member for electrically connecting the negative electrode tab group 16 and a part of a negative electrode terminal structure 18 described later. The positive electrode conductive member 19 and the negative electrode conductive member 20 are disposed between the inner surface 14 a of the lid 14 and the tab side end surface 12 a of the electrode assembly 12.
図2及び図3に示すように、正極導電部材19及び負極導電部材20はそれぞれ、矩形板状の第1〜第3板部61〜63を備える。各第1板部61は、蓋14の内面14aに沿って配置される。各第1板部61の長手方向は、蓋14の長手方向と一致し、各第1板部61の短手方向は、積層方向と一致する。第1板部61の長手方向の端部において、蓋14の短縁部寄りの端部を一端部とし、蓋14の長手方向の中央寄りの端部を他端部とする。正極導電部材19は、第1板部61の一端部に、後述の正極端子構造17の一部が接合される端子接合部61aを備え、負極導電部材20は、第1板部61の長手方向の一端部に、後述の負極端子構造18の一部が接合される端子接合部61aを備える。 As shown in FIGS. 2 and 3, the positive electrode conductive member 19 and the negative electrode conductive member 20 include first to third plate portions 61 to 63 each having a rectangular plate shape. Each first plate portion 61 is disposed along the inner surface 14 a of the lid 14. The longitudinal direction of each first plate portion 61 coincides with the longitudinal direction of the lid 14, and the short direction of each first plate portion 61 coincides with the stacking direction. At the end of the first plate 61 in the longitudinal direction, the end near the short edge of the lid 14 is one end, and the end near the center of the lid 14 in the longitudinal direction is the other end. The positive electrode conductive member 19 includes a terminal bonding portion 61 a to which a part of a positive electrode terminal structure 17 described later is bonded to one end portion of the first plate portion 61, and the negative electrode conductive member 20 is in the longitudinal direction of the first plate portion 61. Is provided with a terminal joining portion 61a to which a part of a negative electrode terminal structure 18 described later is joined.
図2に示すように、各第2板部62は、各第1板部61の一対の長縁部のうち、積層方向の他端側に位置する長縁部の一部から電極組立体12に向けて延びる。各第1板部61及び各第2板部62を積層方向から見たとき、各第2板部62は、第1板部61の長手方向の他端部側に位置する。各第2板部62の長手方向は、蓋14の長手方向と一致する。正極導電部材19の第2板部62は、積層方向の他端側から正極タブ群15の第2屈曲部15cを覆い、負極導電部材20の第2板部62は、積層方向の他端側から負極タブ群16の第2屈曲部15cを覆う。これにより、正極タブ群15及び負極タブ群16は、ケース本体13の内面と接触しない。また、各第2板部62は、ケース本体13の内面から離間している。これにより、第2板部62とケース本体13との絶縁が確保される。 As shown in FIG. 2, each of the second plate portions 62 is formed from a part of the long edge portion located on the other end side in the stacking direction among the pair of long edge portions of each first plate portion 61. Extends towards. When each first plate portion 61 and each second plate portion 62 are viewed from the stacking direction, each second plate portion 62 is located on the other end portion side in the longitudinal direction of the first plate portion 61. The longitudinal direction of each second plate portion 62 coincides with the longitudinal direction of the lid 14. The second plate portion 62 of the positive electrode conductive member 19 covers the second bent portion 15c of the positive electrode tab group 15 from the other end side in the stacking direction, and the second plate portion 62 of the negative electrode conductive member 20 is the other end side in the stacking direction. The second bent portion 15c of the negative electrode tab group 16 is covered. Thereby, the positive electrode tab group 15 and the negative electrode tab group 16 do not contact the inner surface of the case main body 13. Further, each second plate portion 62 is separated from the inner surface of the case main body 13. Thereby, the insulation of the 2nd board part 62 and the case main body 13 is ensured.
各第3板部63は、各第2板部62の一対の長縁部のうち、電極組立体12寄りの長縁部から積層方向の一端側に向けて延びる。図3に示すように、各第1板部61及び第2板部62を積層方向から見たとき、各第3板部63は、第1板部61の長手方向の他端部側に位置する。各第3板部63の長手方向は、蓋14の長手方向と一致し、各第3板部63の短手方向は、積層方向と一致する。本実施形態では、正極導電部材19の第3板部63は、正極タブ群15の第1延在部15bが接合される電極接合部63aを兼ねる。また、負極導電部材20の第3板部63は、負極タブ群16の第1延在部15bが接合される電極接合部63aを兼ねる。 Each third plate portion 63 extends from the long edge portion near the electrode assembly 12 toward the one end side in the stacking direction among the pair of long edge portions of each second plate portion 62. As shown in FIG. 3, when the first plate portion 61 and the second plate portion 62 are viewed from the stacking direction, each third plate portion 63 is positioned on the other end portion side in the longitudinal direction of the first plate portion 61. To do. The longitudinal direction of each third plate portion 63 coincides with the longitudinal direction of the lid 14, and the short direction of each third plate portion 63 coincides with the stacking direction. In the present embodiment, the third plate portion 63 of the positive electrode conductive member 19 also serves as the electrode joint portion 63a to which the first extension portion 15b of the positive electrode tab group 15 is joined. Further, the third plate portion 63 of the negative electrode conductive member 20 also serves as an electrode joint portion 63a to which the first extension portion 15b of the negative electrode tab group 16 is joined.
正極導電部材19及び負極導電部材20はそれぞれ、第1板部61及び第3板部63の長手方向から見たとき、U字状である。正極タブ群15及び負極タブ群16において、第1延在部15bにおける第2屈曲部15c寄りの部分、第2屈曲部15c、及び第2延在部15dは、第1〜第3板部61〜63によって囲まれた空間に収容される。 The positive electrode conductive member 19 and the negative electrode conductive member 20 are U-shaped when viewed from the longitudinal direction of the first plate portion 61 and the third plate portion 63, respectively. In the positive electrode tab group 15 and the negative electrode tab group 16, a portion of the first extending portion 15b near the second bent portion 15c, the second bent portion 15c, and the second extending portion 15d are the first to third plate portions 61. Is accommodated in a space surrounded by ~ 63.
次に、正極端子構造17及び負極端子構造18について説明する。なお、正極端子構造17と負極端子構造18は基本的に同じ構成であるため、共通の部材については、同じ部材番号を使用して説明する。 Next, the positive terminal structure 17 and the negative terminal structure 18 will be described. Since the positive electrode terminal structure 17 and the negative electrode terminal structure 18 have basically the same configuration, common members will be described using the same member numbers.
図3に示すように、正極端子構造17は、蓋14の長手方向の一端側に配置され、負極端子構造18は、蓋14の長手方向の他端側に配置される。正極端子構造17及び負極端子構造18は、電極組立体12と電気を授受する電極端子としての引出端子31を備える。各引出端子31は、平板状の基部31aと、基部31aから突出する軸部31bとを有する。各引出端子31の基部31aは、ケース11の内部において各第1板部61の端子接合部61aと電気的に接続されている。各引出端子31の軸部31bは、ケース11を貫通するとともに、ケース11の外部でかしめられている。正極端子構造17及び負極端子構造18は、ケース11の外部で、引出端子31と電気的に接続された端子接合部材32と、端子接合部材32と電気的に接続された外部接続端子33とを備える。また、正極端子構造17及び負極端子構造18は、ケース11の外部に配置される外側絶縁部材34と、ケース11の内部に配置される絶縁部材としての内側絶縁部材35とを備える。引出端子31は、外側絶縁部材34及び内側絶縁部材35を貫通する。外側絶縁部材34は、引出端子31及び外部接続端子33と蓋14とを絶縁する。 As shown in FIG. 3, the positive terminal structure 17 is disposed on one end side in the longitudinal direction of the lid 14, and the negative terminal structure 18 is disposed on the other end side in the longitudinal direction of the lid 14. The positive terminal structure 17 and the negative terminal structure 18 include an extraction terminal 31 as an electrode terminal that exchanges electricity with the electrode assembly 12. Each extraction terminal 31 has a flat plate-like base portion 31a and a shaft portion 31b protruding from the base portion 31a. The base portion 31 a of each extraction terminal 31 is electrically connected to the terminal joint portion 61 a of each first plate portion 61 inside the case 11. The shaft portion 31 b of each extraction terminal 31 penetrates the case 11 and is caulked outside the case 11. The positive terminal structure 17 and the negative terminal structure 18 include a terminal joining member 32 electrically connected to the lead terminal 31 and an external connection terminal 33 electrically connected to the terminal joining member 32 outside the case 11. Prepare. The positive terminal structure 17 and the negative terminal structure 18 include an outer insulating member 34 disposed outside the case 11 and an inner insulating member 35 serving as an insulating member disposed inside the case 11. The lead terminal 31 penetrates the outer insulating member 34 and the inner insulating member 35. The outer insulating member 34 insulates the lead terminal 31 and the external connection terminal 33 from the lid 14.
正極端子構造17の内側絶縁部材35は、正極導電部材19の第1板部61と蓋14の内面14aとの間に配置される矩形板状の蓋側絶縁部36を備える。負極端子構造18の内側絶縁部材35は、負極導電部材20の第1板部61と蓋14の内面14aとの間に配置される矩形板状の蓋側絶縁部36を備える。各蓋側絶縁部36の長手方向は、蓋14の長手方向と一致し、各蓋側絶縁部36の短手方向は、積層方向と一致する。本実施形態では、各蓋側絶縁部36の長手方向の寸法は、各第1板部61の長手方向の寸法よりも僅かに長い。各蓋側絶縁部36は、各第1板部61の長手方向全体と蓋14の内面14aとの間に配置される。各蓋側絶縁部36の長手方向の端部のうち、蓋14の短縁部寄りの端部を一端部とし、蓋14の長手方向の中央寄りの端部を他端部とする。各蓋側絶縁部36は、長手方向の一端部に、端子接合部61aである第1板部61の長手方向の一端部と蓋14の内面14aとの間に配置される第1絶縁部36aを備える。第1絶縁部36aは、端子接合部61aと蓋14とを絶縁する。蓋側絶縁部36は、長手方向の他端部に、第1板部61の長手方向の他端部と蓋14の内面14aとの間に配置される第2絶縁部36bを備える。第2絶縁部36bは、第1板部61の長手方向の他端部と蓋14とを絶縁する。 The inner insulating member 35 of the positive electrode terminal structure 17 includes a rectangular plate-shaped lid-side insulating portion 36 disposed between the first plate portion 61 of the positive electrode conductive member 19 and the inner surface 14 a of the lid 14. The inner insulating member 35 of the negative electrode terminal structure 18 includes a rectangular plate-shaped lid-side insulating portion 36 disposed between the first plate portion 61 of the negative electrode conductive member 20 and the inner surface 14a of the lid 14. The longitudinal direction of each lid side insulating portion 36 coincides with the longitudinal direction of the lid 14, and the short direction of each lid side insulating portion 36 coincides with the stacking direction. In the present embodiment, the longitudinal dimension of each lid-side insulating portion 36 is slightly longer than the longitudinal dimension of each first plate portion 61. Each lid-side insulating portion 36 is disposed between the entire longitudinal direction of each first plate portion 61 and the inner surface 14 a of the lid 14. Of the end portions in the longitudinal direction of each lid-side insulating portion 36, the end portion near the short edge portion of the lid 14 is one end portion, and the end portion near the center in the longitudinal direction of the lid 14 is the other end portion. Each lid-side insulating portion 36 has a first insulating portion 36a disposed at one end portion in the longitudinal direction between one end portion in the longitudinal direction of the first plate portion 61 that is the terminal joint portion 61a and the inner surface 14a of the lid 14. Is provided. The first insulating portion 36a insulates the terminal joint portion 61a and the lid 14 from each other. The lid-side insulating portion 36 includes a second insulating portion 36b disposed between the other end portion in the longitudinal direction of the first plate portion 61 and the inner surface 14a of the lid 14 at the other end portion in the longitudinal direction. The second insulating portion 36 b insulates the other end portion in the longitudinal direction of the first plate portion 61 from the lid 14.
図2及び図3に示すように、各内側絶縁部材35は、蓋14の長手方向に沿う蓋側絶縁部36の一対の長縁部のうち、積層方向の一端側に位置する長縁部から電極組立体12に向けて延出する矩形板状の第1壁部37を備える。各第1壁部37の長手方向は、蓋14の長手方向と一致する。本実施形態の各第1壁部37の長手方向の寸法は、各第1板部61の長手方向の寸法と同じである。よって、各第1壁部37は、各第1板部61の長手方向全体とケース本体13との間に配置され、各第1板部61とケース本体13とを絶縁する。各第1壁部37は、長手方向における第2絶縁部36b寄りの部分が積層方向の一端側から正極タブ群15を覆うことで、正極タブ群15とケース本体13の長側壁13cとを絶縁するケース側絶縁部である。また、蓋側絶縁部36からの第1壁部37の延出方向において、第1壁部37の先端部37aは、電極組立体12のタブ側端面12aと、第3板部63の下面63bとの間に位置する。 As shown in FIGS. 2 and 3, each inner insulating member 35 is formed of a long edge portion located on one end side in the stacking direction among a pair of long edge portions of the lid side insulating portion 36 along the longitudinal direction of the lid 14. A rectangular plate-shaped first wall portion 37 extending toward the electrode assembly 12 is provided. The longitudinal direction of each first wall portion 37 coincides with the longitudinal direction of the lid 14. The dimension in the longitudinal direction of each first wall portion 37 of the present embodiment is the same as the dimension in the longitudinal direction of each first plate portion 61. Accordingly, each first wall portion 37 is disposed between the entire longitudinal direction of each first plate portion 61 and the case main body 13 to insulate each first plate portion 61 from the case main body 13. Each first wall portion 37 covers the positive electrode tab group 15 from one end side in the stacking direction at a portion near the second insulating portion 36b in the longitudinal direction, thereby insulating the positive electrode tab group 15 and the long side wall 13c of the case body 13 from each other. It is a case side insulating part. Further, in the extending direction of the first wall portion 37 from the lid-side insulating portion 36, the tip end portion 37 a of the first wall portion 37 is composed of the tab-side end surface 12 a of the electrode assembly 12 and the lower surface 63 b of the third plate portion 63. Located between and.
各内側絶縁部材35は、蓋14の長手方向に沿う蓋側絶縁部36の一対の長縁部のうち、積層方向の他端側に位置する長縁部から電極組立体12に向けて延出する矩形板状の第2壁部38を備える。各第2壁部38の長手方向は、蓋14の長手方向と一致する。本実施形態の各第2壁部38の長手方向の寸法は、各第1板部61の長手方向の寸法よりも僅かに長い。蓋側絶縁部36の短手方向において、第1壁部37の内面と第2壁部38の内面との距離は、正極導電部材19の第1板部61の短手方向の寸法よりも僅かに長い。また、各内側絶縁部材35は、積層方向に沿う蓋側絶縁部36の一対の短縁部のうち、蓋14の長手方向の端側に位置する短縁部から電極組立体12に向けて延出する第3壁部39を備える。よって、第1〜第3壁部37〜39は、蓋側絶縁部36の厚さ方向から見たとき、蓋14の長手方向の中央に向けて開口するU字型である。 Each inner insulating member 35 extends toward the electrode assembly 12 from a long edge portion located on the other end side in the stacking direction of the pair of long edge portions of the lid side insulating portion 36 along the longitudinal direction of the lid 14. A rectangular plate-like second wall portion 38 is provided. The longitudinal direction of each second wall portion 38 coincides with the longitudinal direction of the lid 14. The dimension in the longitudinal direction of each second wall portion 38 of the present embodiment is slightly longer than the dimension in the longitudinal direction of each first plate portion 61. In the short direction of the lid-side insulating portion 36, the distance between the inner surface of the first wall portion 37 and the inner surface of the second wall portion 38 is slightly smaller than the dimension in the short direction of the first plate portion 61 of the positive electrode conductive member 19. Long. Each of the inner insulating members 35 extends from the short edge portion located on the end side in the longitudinal direction of the lid 14 toward the electrode assembly 12 among the pair of short edge portions of the lid side insulating portion 36 along the stacking direction. A third wall portion 39 is provided. Therefore, the first to third wall portions 37 to 39 are U-shaped and open toward the center in the longitudinal direction of the lid 14 when viewed from the thickness direction of the lid-side insulating portion 36.
各内側絶縁部材35は、蓋側絶縁部36における蓋14の内面14aと対向する面とは反対側の面と、第1〜第3壁部37〜39の内面とによって囲まれた収容部40を備える。各第1板部61は、収容部40に収容されるとともに、第1壁部37と第2壁部38とによって積層方向に挟持されている。また、各第1板部61は、蓋14の長手方向の端側に移動しないように第3壁部39によって位置決めされる。 Each inner insulating member 35 includes a housing portion 40 surrounded by a surface of the lid-side insulating portion 36 opposite to the surface facing the inner surface 14a of the lid 14 and the inner surfaces of the first to third wall portions 37 to 39. Is provided. Each first plate portion 61 is accommodated in the accommodating portion 40 and is sandwiched between the first wall portion 37 and the second wall portion 38 in the stacking direction. Further, each first plate portion 61 is positioned by the third wall portion 39 so as not to move to the end side in the longitudinal direction of the lid 14.
次に、二次電池の製造方法について説明する。
図4に示すように、蓋14に、引出端子31、端子接合部材32、外部接続端子33、外側絶縁部材34、及び内側絶縁部材35を組付け、正極端子構造17及び負極端子構造18を製造する。正極導電部材19及び負極導電部材20はそれぞれ、内側絶縁部材35に保持された第1板部61と、第1板部61の一対の長縁部のうち、積層方向の他端側に位置する長縁部の一部から電極組立体12に向けて延出する平板状の板部前駆体64とを有する。
Next, a method for manufacturing a secondary battery will be described.
As shown in FIG. 4, the lead terminal 31, the terminal joining member 32, the external connection terminal 33, the outer insulating member 34, and the inner insulating member 35 are assembled to the lid 14 to manufacture the positive terminal structure 17 and the negative terminal structure 18. To do. Each of the positive electrode conductive member 19 and the negative electrode conductive member 20 is located on the other end side in the stacking direction of the first plate portion 61 held by the inner insulating member 35 and the pair of long edges of the first plate portion 61. A flat plate portion precursor 64 extending from a part of the long edge portion toward the electrode assembly 12.
次に、正極タブ群15及び負極タブ群16の先端部が第1板部61側に位置するように、第1板部61及び板部前駆体64に沿って正極タブ群15及び負極タブ群16を重ねて配置する。これにより、正極タブ群15及び負極タブ群16に第2屈曲部15c及び第2延在部15dが形成される。次に、板部前駆体64の先端側部位と正極タブ群15及び負極タブ群16とをレーザ溶接して接合する。なお、板部前駆体64の先端側部位の周辺には、図示しないレーザ溶接装置や溶接に用いられる治具(例えば、正極タブ26や負極タブ29を押圧する治具)が配置される。次に、各板部前駆体64の先端側部位を積層方向の一端側に向けて折り曲げ、板部前駆体64の先端側部位と電極組立体12のタブ側端面12aとを対向させる。これにより、各板部前駆体64の先端側部位は、電極接合部63aを有するとともに正極タブ群15及び負極タブ群16を電極組立体12側から覆う第3板部63となり、各板部前駆体64の基端部は、正極タブ群15及び負極タブ群16を積層方向の一端側から覆う第2板部62となる。また、正極タブ群15及び負極タブ群16には、第1屈曲部15a及び第1延在部15bが形成される。 Next, the positive electrode tab group 15 and the negative electrode tab group along the first plate part 61 and the plate part precursor 64 so that the front ends of the positive electrode tab group 15 and the negative electrode tab group 16 are located on the first plate part 61 side. 16 are arranged in an overlapping manner. As a result, the second bent portion 15 c and the second extending portion 15 d are formed in the positive electrode tab group 15 and the negative electrode tab group 16. Next, the tip side portion of the plate portion precursor 64 and the positive electrode tab group 15 and the negative electrode tab group 16 are joined by laser welding. In addition, a laser welding apparatus (not shown) and a jig used for welding (for example, a jig for pressing the positive electrode tab 26 and the negative electrode tab 29) are arranged around the front end portion of the plate portion precursor 64. Next, the front end side portion of each plate portion precursor 64 is bent toward one end side in the stacking direction so that the front end side portion of the plate portion precursor 64 and the tab side end surface 12a of the electrode assembly 12 face each other. Thereby, the tip side portion of each plate portion precursor 64 becomes the third plate portion 63 that has the electrode joint portion 63a and covers the positive electrode tab group 15 and the negative electrode tab group 16 from the electrode assembly 12 side, and each plate portion precursor. The base end portion of the body 64 is a second plate portion 62 that covers the positive electrode tab group 15 and the negative electrode tab group 16 from one end side in the stacking direction. The positive electrode tab group 15 and the negative electrode tab group 16 are formed with a first bent portion 15a and a first extending portion 15b.
そして、電極組立体12をケース本体13の開口部13aからケース本体13内に挿入し、ケース本体13と蓋14と接合することで、二次電池10が製造される。
次に、本実施形態の効果を作用とともに記載する。
Then, the secondary battery 10 is manufactured by inserting the electrode assembly 12 into the case body 13 from the opening 13 a of the case body 13 and joining the case body 13 and the lid 14.
Next, the effect of this embodiment will be described together with the action.
(1)積層方向の一端側において、正極タブ群15は、正極端子構造17の内側絶縁部材35の第1壁部37によって覆われるため、ケース本体13の長側壁13cの内面と絶縁される。また、積層方向の他端側において、正極タブ群15は、正極導電部材19の第2板部62によって覆われ、第2板部62は、ケース本体13と離間しているため、正極タブ群15は、ケース本体13の長側壁13cの内面と接触しない。よって、内側絶縁部材35の第1壁部37と正極導電部材19の第2板部62により、正極タブ群15とケース本体13とを絶縁できる。 (1) Since the positive electrode tab group 15 is covered with the first wall portion 37 of the inner insulating member 35 of the positive electrode terminal structure 17 on one end side in the stacking direction, it is insulated from the inner surface of the long side wall 13 c of the case body 13. Further, the positive electrode tab group 15 is covered with the second plate portion 62 of the positive electrode conductive member 19 on the other end side in the stacking direction, and the second plate portion 62 is separated from the case main body 13. 15 does not contact the inner surface of the long side wall 13 c of the case body 13. Therefore, the positive electrode tab group 15 and the case main body 13 can be insulated by the first wall portion 37 of the inner insulating member 35 and the second plate portion 62 of the positive electrode conductive member 19.
同様に、積層方向の一端側において、負極タブ群16は、負極端子構造18の内側絶縁部材35の第1壁部37によって覆われるため、ケース本体13の長側壁13cの内面と絶縁される。また、積層方向の他端側において、負極タブ群16は、負極導電部材20の第2板部62によって覆われ、第2板部62は、ケース本体13と離間しているため、負極タブ群16は、ケース本体13の長側壁13cの内面と接触しない。よって、内側絶縁部材35の第1壁部37と負極導電部材20の第2板部62により、負極タブ群16とケース本体13とを絶縁できる。 Similarly, on one end side in the stacking direction, the negative electrode tab group 16 is covered with the first wall portion 37 of the inner insulating member 35 of the negative electrode terminal structure 18, so that it is insulated from the inner surface of the long side wall 13 c of the case body 13. Further, the negative electrode tab group 16 is covered with the second plate portion 62 of the negative electrode conductive member 20 on the other end side in the stacking direction, and the second plate portion 62 is separated from the case main body 13. 16 does not contact the inner surface of the long side wall 13 c of the case body 13. Therefore, the negative electrode tab group 16 and the case body 13 can be insulated from each other by the first wall portion 37 of the inner insulating member 35 and the second plate portion 62 of the negative electrode conductive member 20.
(2)蓋側絶縁部36からの第1壁部37の延出方向において、第1壁部37の先端部37aは、電極組立体12のタブ側端面12aと第3板部63の下面63bとの間に位置する。このため、電極組立体12が蓋14側に移動しようとしても、第1壁部37の先端部37aが電極組立体12のタブ側端面12aと接触することで、蓋14側への電極組立体12の位置ずれを規制できる。 (2) In the extending direction of the first wall portion 37 from the lid-side insulating portion 36, the tip end portion 37 a of the first wall portion 37 is the tab-side end surface 12 a of the electrode assembly 12 and the lower surface 63 b of the third plate portion 63. Located between and. For this reason, even if the electrode assembly 12 is about to move to the lid 14 side, the tip end portion 37a of the first wall portion 37 comes into contact with the tab side end surface 12a of the electrode assembly 12, so that the electrode assembly toward the lid 14 side is reached. 12 positional deviations can be regulated.
(3)内側絶縁部材35の蓋側絶縁部36は、第1板部61の長手方向全体とケース本体13との間に配置されるため、第1板部61の長手方向の一端部である端子接合部61aと蓋14との絶縁に加えて、第1板部61の長手方向の他端部と蓋14との絶縁も確保できる。 (3) Since the lid-side insulating portion 36 of the inner insulating member 35 is disposed between the entire longitudinal direction of the first plate portion 61 and the case body 13, it is one end portion of the first plate portion 61 in the longitudinal direction. In addition to the insulation between the terminal joining portion 61a and the lid 14, insulation between the other end portion in the longitudinal direction of the first plate portion 61 and the lid 14 can be secured.
(4)第1壁部37は、第1板部61の長手方向全体とケース本体13の内面との間に配置される。このため、正極タブ群15及び負極タブ群16とケース本体13との絶縁に加えて、第1板部61の長手方向全体とケース本体13との絶縁も確保できる。また、電極組立体12が蓋14側に移動しようとした際に、第1壁部37の先端部37aにおいて電極組立体12のタブ側端面12aと接触する面積が大きくなるため、蓋14側への電極組立体12の位置ずれをより規制できる。 (4) The first wall portion 37 is disposed between the entire longitudinal direction of the first plate portion 61 and the inner surface of the case body 13. For this reason, in addition to the insulation between the positive electrode tab group 15 and the negative electrode tab group 16 and the case main body 13, the insulation between the entire longitudinal direction of the first plate portion 61 and the case main body 13 can be secured. Further, when the electrode assembly 12 is about to move to the lid 14 side, the area of the tip end portion 37a of the first wall portion 37 that contacts the tab-side end surface 12a of the electrode assembly 12 is increased, so that the electrode assembly 12 moves to the lid 14 side. The positional deviation of the electrode assembly 12 can be further regulated.
(5)正極導電部材19の板部前駆体64に正極タブ群15を接合した後で、板部前駆体64を屈曲させて第2板部62及び第3板部63を形成した。よって、第1〜第3板部61〜63が形成された正極導電部材19に正極タブ群15を接合する場合と比較して、レーザ溶接装置や溶接に用いられる治具(例えば、正極タブ26を押圧する治具)を配置するスペースを広く確保できる。 (5) After joining the positive electrode tab group 15 to the plate portion precursor 64 of the positive electrode conductive member 19, the plate portion precursor 64 was bent to form the second plate portion 62 and the third plate portion 63. Therefore, compared with the case where the positive electrode tab group 15 is joined to the positive electrode conductive member 19 in which the first to third plate portions 61 to 63 are formed, a laser welding device or a jig used for welding (for example, the positive electrode tab 26). It is possible to secure a wide space for disposing the jig for pressing.
なお、上記実施形態は、以下のように変更してもよい。
○ 正極電極21において、正極活物質層25は正極金属箔24の片面に存在してもよい。同様に、負極電極22において、負極活物質層28は負極金属箔27の片面に存在してもよい。
In addition, you may change the said embodiment as follows.
In the positive electrode 21, the positive electrode active material layer 25 may exist on one side of the positive electrode metal foil 24. Similarly, in the negative electrode 22, the negative electrode active material layer 28 may exist on one side of the negative electrode metal foil 27.
○ 正極タブ群15は、第2屈曲部15c及び第2延在部15dを備えなくてもよい。同様に、負極タブ群16は、第2屈曲部15c及び第2延在部15dを備えなくてもよい。 (Circle) the positive electrode tab group 15 does not need to be provided with the 2nd bending part 15c and the 2nd extension part 15d. Similarly, the negative electrode tab group 16 may not include the second bent portion 15c and the second extending portion 15d.
○ 正極端子構造17及び負極端子構造18の内側絶縁部材35のうち、一方の極性の内側絶縁部材35が第1壁部37を備えていれば、他方の極性の内側絶縁部材35は第1壁部37を備えていなくてもよい。この場合、内側絶縁部材35が第1壁部37を備えていない方の極性については、例えば、ケース本体13の内面に絶縁シートを貼着するなどして、タブ群とケース本体13とを絶縁する。 If the inner insulating member 35 of one polarity has the first wall portion 37 among the inner insulating members 35 of the positive electrode terminal structure 17 and the negative electrode terminal structure 18, the inner insulating member 35 of the other polarity is the first wall. The portion 37 may not be provided. In this case, for the polarity of the inner insulating member 35 that does not include the first wall portion 37, the tab group and the case main body 13 are insulated by, for example, attaching an insulating sheet to the inner surface of the case main body 13. To do.
○ 内側絶縁部材35の蓋側絶縁部36において、第2絶縁部36bを省略してもよい。この場合、第1板部61の長手方向の他端部と蓋14とは、例えば、十分な間隔を空けて配置されることで絶縁される。また、第1壁部37において積層方向の一端側から正極タブ群15又は負極タブ群16を覆う部分は、蓋側絶縁部36の第1絶縁部36aから電極組立体12に向けて延出する部分を蓋14の長手方向に延長することで構成される。 In the lid side insulating part 36 of the inner insulating member 35, the second insulating part 36b may be omitted. In this case, the other end portion in the longitudinal direction of the first plate portion 61 and the lid 14 are insulated, for example, by being arranged at a sufficient interval. Further, the portion of the first wall portion 37 that covers the positive electrode tab group 15 or the negative electrode tab group 16 from one end side in the stacking direction extends from the first insulating portion 36 a of the lid-side insulating portion 36 toward the electrode assembly 12. It is configured by extending the portion in the longitudinal direction of the lid 14.
○ 内側絶縁部材35の第1壁部37は、第1板部61の長手方向全体とケース本体13との間に配置されなくてもよい。すなわち、第1壁部37によって正極タブ群15又は負極タブ群16とケース本体13の内面とを絶縁できれば、第1板部61の長手方向に沿う正極タブ群15又は負極タブ群16の幅に応じて、第1壁部37の長手方向の寸法を変更してよい。 The first wall portion 37 of the inner insulating member 35 may not be disposed between the entire longitudinal direction of the first plate portion 61 and the case main body 13. In other words, if the positive electrode tab group 15 or the negative electrode tab group 16 and the inner surface of the case body 13 can be insulated by the first wall portion 37, the width of the positive electrode tab group 15 or the negative electrode tab group 16 along the longitudinal direction of the first plate portion 61. Accordingly, the longitudinal dimension of the first wall portion 37 may be changed.
○ 上記実施形態では、第3板部63の長手方向の全体が電極接合部63aであったが、第3板部63は、長手方向の一部に電極接合部63aを備える構成でもよい。
○ 正極導電部材19の板部前駆体64と正極タブ群15との接合方法、及び負極導電部材20の板部前駆体64と負極タブ群16との接合方法は、レーザ溶接に限定されず、例えば、抵抗溶接や超音波溶接でもよい。
In the above embodiment, the entire longitudinal direction of the third plate portion 63 is the electrode joint portion 63a. However, the third plate portion 63 may be configured to include the electrode joint portion 63a in a part of the longitudinal direction.
The bonding method between the plate portion precursor 64 of the positive electrode conductive member 19 and the positive electrode tab group 15 and the bonding method between the plate portion precursor 64 of the negative electrode conductive member 20 and the negative electrode tab group 16 are not limited to laser welding, For example, resistance welding or ultrasonic welding may be used.
○ 正極導電部材19の第1〜第3板部61〜63を形成した後で、正極タブ群15を接合してもよい。同様に、負極導電部材20の第1〜第3板部61〜63を形成した後で、負極タブ群16を接合してもよい。 The positive electrode tab group 15 may be joined after the first to third plate portions 61 to 63 of the positive electrode conductive member 19 are formed. Similarly, the negative electrode tab group 16 may be joined after the first to third plate portions 61 to 63 of the negative electrode conductive member 20 are formed.
○ 蓄電装置は、例えばキャパシタなど、二次電池以外の蓄電装置にも適用可能である。
○ 二次電池10は、リチウムイオン二次電池以外の他の二次電池であってもよい。要は、正極用の活物質と負極用の活物質との間をイオンが移動するとともに電荷の教授を行うものであればよい。
The power storage device can also be applied to power storage devices other than secondary batteries, such as capacitors.
The secondary battery 10 may be a secondary battery other than the lithium ion secondary battery. In short, any ion may be used as long as ions move between the positive electrode active material and the negative electrode active material and the charge is taught.
10…蓄電装置としての二次電池、11…ケース、12…電極組立体、12a…タブ側端面、13…ケース本体、13a…開口部、14…蓋、14a…内面、15…タブ群としての正極タブ群、16…タブ群としての負極タブ群、19…導電部材としての正極導電部材、20…導電部材としての負極導電部材、21…電極としての正極電極、22…電極としての負極電極、26…タブとしての正極タブ、29…タブとしての負極タブ、31…電極端子としての引出端子、35…絶縁部材としての内側絶縁部材、36…蓋側絶縁部、37…ケース側絶縁部としての第1壁部、61…第1板部、61a…端子接合部、62…第2板部、63…第3板部、63a…電極接合部、63b…下面。
DESCRIPTION OF SYMBOLS 10 ... Secondary battery as a power storage device, 11 ... Case, 12 ... Electrode assembly, 12a ... Tab side end face, 13 ... Case body, 13a ... Opening, 14 ... Lid, 14a ... Inner surface, 15 ... As a tab group Positive electrode tab group, 16 ... Negative electrode tab group as tab group, 19 ... Positive electrode conductive member as conductive member, 20 ... Negative electrode conductive member as conductive member, 21 ... Positive electrode as electrode, 22 ... Negative electrode as electrode, 26 ... Positive electrode tab as a tab, 29 ... Negative electrode tab as a tab, 31 ... Lead terminal as an electrode terminal, 35 ... Inner insulating member as an insulating member, 36 ... Cover side insulating portion, 37 ... As a case side insulating portion 1st wall part, 61 ... 1st board part, 61a ... Terminal junction part, 62 ... 2nd board part, 63 ... 3rd board part, 63a ... Electrode junction part, 63b ... Lower surface.
Claims (4)
前記電極組立体を収容するケース本体、及び前記ケース本体の開口部を閉塞する蓋を有するケースと、
前記電極組立体と電気を授受する電極端子と、
前記タブ群が存在する前記電極組立体のタブ側端面と前記蓋との間に配置され、前記電極端子と接合される端子接合部、及び前記タブ群が接合される電極接合部を有する導電部材と、
前記端子接合部と前記蓋との間に配置され、前記端子接合部と前記蓋とを絶縁する蓋側絶縁部を有する絶縁部材と、
を備え、
前記タブ群は、前記電極の積層方向の一端側で寄せ集められるとともに前記積層方向の他端側に向けて折り曲げられている蓄電装置であって、
前記導電部材は、
前記端子接合部を有するとともに、前記蓋の内面に沿って配置される第1板部と、
前記第1板部から前記電極組立体に向けて延出するとともに、前記積層方向の他端側から前記タブ群を覆い、かつ前記ケース本体から離間した第2板部と、
前記第2板部から前記積層方向の一端側に向けて延出するとともに、前記タブ群を前記電極組立体側から覆い、かつ前記電極接合部を有する第3板部と、を備え、
前記絶縁部材は、前記蓋側絶縁部から前記電極組立体に向けて延出するとともに、前記積層方向の一端側から前記タブ群を覆い、前記タブ群と前記ケース本体とを絶縁するケース側絶縁部を有することを特徴とする蓄電装置。 An electrode assembly having a tab group in which electrodes are stacked and tabs protruding from the electrodes are stacked;
A case body containing the electrode assembly, and a case having a lid for closing an opening of the case body;
An electrode terminal for transferring electricity to and from the electrode assembly;
A conductive member having a terminal joint portion that is disposed between a tab side end surface of the electrode assembly in which the tab group is present and the lid and is joined to the electrode terminal, and an electrode joint portion to which the tab group is joined. When,
An insulating member disposed between the terminal joint and the lid, and having a lid-side insulating portion that insulates the terminal joint and the lid;
With
The tab group is a power storage device that is gathered together at one end side in the stacking direction of the electrodes and bent toward the other end side in the stacking direction,
The conductive member is
A first plate portion disposed along the inner surface of the lid;
A second plate portion extending from the first plate portion toward the electrode assembly, covering the tab group from the other end side in the stacking direction, and spaced from the case body;
A third plate portion extending from the second plate portion toward one end side in the stacking direction, covering the tab group from the electrode assembly side, and having the electrode joint portion;
The insulating member extends from the lid-side insulating portion toward the electrode assembly, covers the tab group from one end side in the stacking direction, and insulates the tab group from the case body. A power storage device comprising a portion.
前記端子接合部は、前記第1板部の長手方向の一端部であり、
前記蓋側絶縁部は、前記第1板部の長手方向の他端部と前記蓋との間に配置される請求項1又は請求項2に記載の蓄電装置。 The first plate portion has a rectangular plate shape,
The terminal joint portion is one end portion in the longitudinal direction of the first plate portion,
The power storage device according to claim 1, wherein the lid-side insulating portion is disposed between the other end portion in the longitudinal direction of the first plate portion and the lid.
The power storage device according to any one of claims 1 to 3, wherein the case-side insulating portion is disposed between the entire longitudinal direction of the first plate portion and the case main body.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018062743A JP2019175689A (en) | 2018-03-28 | 2018-03-28 | Power storage device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2018062743A JP2019175689A (en) | 2018-03-28 | 2018-03-28 | Power storage device |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2019175689A true JP2019175689A (en) | 2019-10-10 |
Family
ID=68167231
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2018062743A Pending JP2019175689A (en) | 2018-03-28 | 2018-03-28 | Power storage device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2019175689A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115295973A (en) * | 2022-07-08 | 2022-11-04 | 东莞新能安科技有限公司 | Batteries and Electronic Devices |
-
2018
- 2018-03-28 JP JP2018062743A patent/JP2019175689A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115295973A (en) * | 2022-07-08 | 2022-11-04 | 东莞新能安科技有限公司 | Batteries and Electronic Devices |
CN115295973B (en) * | 2022-07-08 | 2024-05-31 | 东莞新能安科技有限公司 | Batteries and electronic devices |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5812082B2 (en) | Power storage device | |
JP5942449B2 (en) | Power storage device and vehicle | |
WO2015098955A1 (en) | Electricity storage device | |
WO2014171436A1 (en) | Accumulator device | |
JP2019175690A (en) | Power storage device | |
JP2015032549A (en) | Power storage device | |
JP6911654B2 (en) | Power storage device and manufacturing method of power storage device | |
JP6677105B2 (en) | Power storage device and method for manufacturing power storage device | |
JP2019121433A (en) | Power storage device | |
JP2019140068A (en) | Power storage device, method of manufacturing power storage device, and device of manufacturing power storage device | |
JP2018206758A (en) | Power storage device and manufacturing method of power storage device | |
JP2015072828A (en) | Electricity storage device | |
JP2016091737A (en) | Power storage device | |
JP2018190510A (en) | Power storage device | |
JP2018006119A (en) | Power storage device | |
JP2019175689A (en) | Power storage device | |
JP6657810B2 (en) | Method of manufacturing power storage device and power storage device | |
JP2016021281A (en) | Power storage device | |
JP2018014289A (en) | Power storage device | |
JP2019175687A (en) | Power storage device | |
JP2019121435A (en) | Power storage device | |
JP6801371B2 (en) | Power storage device | |
JP2020047502A (en) | Manufacturing apparatus of power storage device and manufacturing method of power storage device | |
JP2017216119A (en) | Power storage device | |
JP2018206731A (en) | Power storage device |