WO2014118873A1 - 電池 - Google Patents
電池 Download PDFInfo
- Publication number
- WO2014118873A1 WO2014118873A1 PCT/JP2013/051824 JP2013051824W WO2014118873A1 WO 2014118873 A1 WO2014118873 A1 WO 2014118873A1 JP 2013051824 W JP2013051824 W JP 2013051824W WO 2014118873 A1 WO2014118873 A1 WO 2014118873A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- positive electrode
- electrode body
- battery
- electrode
- positive
- Prior art date
Links
- 238000004804 winding Methods 0.000 claims description 61
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 230000000052 comparative effect Effects 0.000 description 16
- 230000002093 peripheral effect Effects 0.000 description 16
- 239000011888 foil Substances 0.000 description 9
- 238000009783 overcharge test Methods 0.000 description 9
- 230000008602 contraction Effects 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 239000007773 negative electrode material Substances 0.000 description 4
- 239000007774 positive electrode material Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000011162 core material Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 239000006230 acetylene black Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
-
- 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
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Definitions
- the present invention relates to an electrode body in which a positive electrode plate and a negative electrode plate each having a strip shape are overlapped with each other via a separator and wound flatly around an axis, and a positive electrode protruding ridge located on one side in the axial direction of the electrode body
- the present invention relates to a battery including a positive electrode terminal member connected to a turning part.
- Patent Document 1 discloses a battery including such a flat wound electrode body and a positive electrode terminal member (see FIGS. 1 to 3 of Patent Document 1).
- the innermost curved part (positive innermost part) bent with the smallest radius of curvature (with the largest curvature) of the positive electrode plate The short circuit is most likely to occur between the circumferential curved portion) and the negative electrode plate facing the circumferential curved portion.
- the reason is as follows. That is, in the wound electrode body, heat is more likely to be stored in the radially inner portion.
- the portion of the electrode body that is likely to be short-circuited is the portion where the positive electrode plate and the negative electrode plate face each other with the separator interposed therebetween.
- the above-mentioned positive electrode innermost curved part and the negative electrode plate which opposes this are located in the innermost radial direction. For this reason, temperature becomes the highest in the vicinity of the innermost peripheral curved portion of the positive electrode.
- the separator shrinks when the temperature rises, the size of the separator shrinks in the width direction (the axial direction of the electrode body) at the portion of the separator facing the innermost curved portion of the positive electrode.
- this contraction is large, a portion where no separator is interposed is formed between the positive innermost curved portion and the negative electrode plate facing the positive inner plate, and the positive plate (the positive innermost curved portion) and the negative plate are in contact with each other. A short circuit may occur.
- the separator is easy to move, and the separator is likely to undergo large thermal contraction.
- the innermost peripheral portion of the positive electrode plate in the respective curved portions (one-side curved end portion and the other-side curved end portion) at both ends in the electrode body width direction is a portion where the positive electrode plate and the negative electrode plate overlap with each other in the radial direction. Since the separator does not exist, the separator facing it is likely to move, and the separator is considered to be easily thermally contracted.
- the positive electrode plate has a lower thermal conductivity than the negative electrode plate, such as when aluminum is used for the positive electrode foil of the positive electrode plate and copper is used for the negative electrode electrode foil of the negative electrode plate, the positive electrode plate Therefore, the temperature rises on the side of the electrode body where the positive electrode foil in the axial direction protrudes (positive electrode protruding winding portion side). For this reason, the separator largely heat shrinks in the width direction (the axial direction of the electrode body) on the positive electrode protruding winding portion side of the electrode body, and the positive electrode plate and the negative electrode plate are in contact with each other, so that a short circuit is likely to occur. That is, when the flat wound electrode body abnormally generates heat, a short circuit is most likely to occur on the positive electrode protruding wound portion side (one side in the axial direction) of the positive innermost curved portion.
- the positive electrode connection portion connected to the terminal connection portion of the positive electrode terminal member of the positive electrode protruding winding portion is located closer to the positive innermost curved portion, when the electrode body abnormally generates heat, the positive electrode It has been found that a short circuit is likely to occur at the inner curved portion. The reason is presumed to be as follows. That is, when forming the positive electrode connecting portion by connecting the terminal connecting portion of the positive electrode terminal member to the positive electrode protruding winding portion of the electrode body by welding or the like, the edge of the positive electrode plate forming the positive electrode protruding winding portion is connected to the electrode body.
- the present invention has been made in view of the present situation, and when a flat wound electrode body abnormally generates heat, the positive electrode protruding wound portion side (axis line of the innermost curved portion of the positive electrode in the electrode body) A battery capable of appropriately suppressing the occurrence of a short circuit on one side of the direction) is provided.
- One aspect of the present invention for solving the above-described problem is that a belt-shaped positive electrode plate and a belt-shaped negative electrode plate having higher thermal conductivity than the positive electrode plate are overlapped with each other via a strip-shaped separator made of a porous resin.
- a battery comprising: an electrode body; and a positive electrode terminal member connected to the positive electrode protruding winding portion of the electrode body by a terminal connection portion, wherein the flat electrode body is orthogonal to the axial direction and the electrode body thickness direction.
- the positive electrode plate, the negative electrode plate, and the separator are bent into a semicylindrical shape and overlapped with each other, and positioned on the other side in the electrode body width direction.
- the positive electrode plate, the negative electrode plate and the cell A positive electrode innermost curved portion bent with the smallest radius of curvature of the positive electrode plate in the one curved end portion.
- the electrode from the positive electrode connection portion connected to the terminal connection portion of the positive electrode protruding winding portion to the one end in the electrode body width direction of the one side curved end portion of the electrode body.
- the dimension in the body width direction is defined as a distance Ha
- the dimension in the electrode body width direction from the positive electrode connecting portion to the other end in the electrode body width direction among the other curved end portions of the electrode body is defined as a distance Hb.
- the battery is formed by connecting the terminal connection portion to the positive electrode connection portion at a position where the distance Ha and the distance Hb satisfy Ha ⁇ 1.1Hb.
- the portion of the electrode body that is most likely to be short-circuited that is, the positive electrode protruding wound portion side of the positive innermost curved portion (in the axial direction) On one side) can properly suppress the occurrence of short circuit
- the battery further includes a battery case that houses the electrode body and that fixes the positive electrode terminal member to a terminal fixing wall portion of the battery and extends to the outside.
- the electrode body includes the electrode body.
- a battery housed in the battery case in a form in which the width direction is orthogonal to the terminal fixing wall portion and the other side curved end portion is closer to the terminal fixing wall portion side than the one side curved end portion. And good.
- the distance Ha and the distance Hb may be batteries satisfying Ha ⁇ 2.5Hb.
- the dimension in the width direction of the electrode body in the central portion located between the one side curved end portion and the other side curved end portion of the electrode body is defined as a dimension He
- the positive electrode When the dimension of the connecting portion in the width direction of the electrode body is defined as a dimension Hc, the dimension Hc is preferably a battery having a size satisfying Hc ⁇ 0.5He.
- the distance Ha and the distance Hb are preferably satisfying Ha ⁇ Wa and Hb ⁇ Wa when the thickness of the electrode body is a thickness Wa. .
- the positive electrode connection portion of the positive electrode protruding winding portion has a thickness of the electrode body among the edge portions forming the positive electrode protruding winding portion having a flat spiral shape.
- the battery is preferably composed of all the overlapping portions overlapping the terminal connection portion of the positive electrode terminal member when viewed in the direction, and all the overlapping portions are bundled and welded to the terminal connection portion.
- FIG. 4 is a plan view of the electrode body and the positive electrode terminal member according to the embodiment as seen from the axial direction.
- 1 is a perspective view of an electrode body according to an embodiment. It is explanatory drawing which shows typically arrangement
- FIG. 1 and 2 show a battery 10 according to the present embodiment.
- FIG. 3 shows the lid member 23, the positive terminal member 60, the negative terminal member 70, and the like.
- FIG. 4 shows the electrode body 30 and the positive electrode terminal member 60 connected thereto. 5 to 7 show the electrode body 30 and a developed state thereof.
- the battery thickness direction BH, the battery lateral direction CH, and the battery vertical direction DH of the battery 10 will be described as the directions shown in FIGS. 1 and 2.
- the axial direction EH, the electrode body thickness direction FH, and the electrode body width direction GH of the electrode body 30 will be described as directions shown in FIGS. 2 and 4 to 6.
- the battery 10 is a rectangular and sealed lithium ion secondary battery mounted on a vehicle such as a hybrid vehicle or an electric vehicle.
- the battery 10 includes a rectangular battery case 20, a flat wound electrode body 30 accommodated in the battery case 20, a positive terminal member 60 and a negative terminal member 70 supported by the battery case 20, and the like. It is composed of Further, a non-aqueous electrolyte solution 27 is held in the battery case 20.
- the battery case 20 is formed of metal (specifically, aluminum).
- the battery case 20 includes a bottomed rectangular tube-shaped case main body 21 having a rectangular opening 21h only on the upper side, and a rectangular plate-shaped lid member (terminal fixing wall portion) that seals the opening 21h of the case main body 21. ) 23 (see FIGS. 1 to 3).
- a non-returnable safety valve 23v is provided near the center in the longitudinal direction (battery lateral direction CH).
- a liquid injection hole 23 h that is used when injecting the electrolyte solution 27 into the battery case 20 is provided in the vicinity of the safety valve 23 v and is hermetically sealed by the sealing member 25.
- a positive electrode terminal member 60 and a negative electrode terminal member 70 which are extended from the inside of the battery case 20 to the outside are fixedly provided near both ends in the longitudinal direction.
- each of the positive electrode terminal member 60 and the negative electrode terminal member 70 is connected to the electrode body 30 in the battery case 20, and passes through the lid member 23 and extends to the outside of the battery case 20.
- the members 61 and 71 are composed of crank-shaped second terminal members 62 and 72 which are disposed on the lid member 23 and fixed to the first terminal members 61 and 71 by crimping.
- the first terminal member 61 of the positive electrode terminal member 60 has a rectangular plate-like terminal connection portion 61j connected (welded) to the positive electrode connection portion 30cj of the positive electrode protruding winding portion 30c in the electrode body 30 described later.
- the first terminal member 71 of the negative electrode terminal member 70 has a rectangular plate-like terminal connection portion 71j connected (welded) to the negative electrode connection portion 30dj of the negative electrode protruding winding portion 30d of the electrode body 30.
- the positive electrode terminal member 60 and the negative electrode terminal member 70 are disposed inside the lid member 23 (inside the case) together with metal fastening members 65 and 75 for fastening connection terminals outside the battery, such as bus bars and crimp terminals.
- the first insulating members 67 and 77 made of resin and the second insulating members 68 and 78 made of resin disposed outside the case 23 (outside the case) are fixed to the cover member 23.
- the electrode body 30 is housed in the battery case 20 in a state of being laid down so that its axis (winding axis) AX is parallel to the battery lateral direction CH (see FIG. 2).
- the electrode body 30 includes a belt-like positive electrode plate 31 and a belt-like negative electrode plate 41 which are overlapped with each other via two belt-like separators 51 and 51 made of porous resin (see FIG. 7), and around the axis AX. It is wound and compressed into a flat shape (see FIGS. 5 and 6).
- the positive electrode plate 31 has a strip-shaped positive electrode foil 32 made of aluminum as a core material.
- a part of the positive electrode foil 32 in the width direction (vertical direction in FIGS. 5 and 7) (upward portion in FIGS. 5 and 7) is a positive electrode in a strip shape in the longitudinal direction (left and right direction in FIG. 7).
- the electrode foil 32 is an exposed portion 32m extending to be exposed.
- positive electrode active material layers 33 and 33 extending in a strip shape in the longitudinal direction are formed on both main surfaces of portions other than the exposed portion 32m (downward in FIGS. 5 and 7).
- the positive electrode active material layer 33 is formed of a positive electrode active material, a conductive material, and a binder.
- a lithium / cobalt / nickel / manganese composite oxide is used as the positive electrode active material.
- Acetylene black (AB) is used as the conductive material, and polyvinylidene fluoride (PVDF) is used as the binder.
- the negative electrode plate 41 has a strip-shaped negative electrode foil 42 made of copper as a core material.
- a part of the negative electrode foil 42 in the width direction (vertical direction in FIGS. 5 and 7) (the lower portion in FIGS. 5 and 7) is a negative electrode in a strip shape in the longitudinal direction (horizontal direction in FIG. 7).
- the electrode foil 42 is exposed to be an exposed portion 42m extending.
- negative electrode active material layers 43 and 43 extending in a strip shape in the longitudinal direction are formed on both main surfaces of portions other than the exposed portion 42m (upward in FIGS. 5 and 7).
- the negative electrode active material layer 43 is formed of a negative electrode active material, a binder, and a thickener.
- natural graphite is used as the negative electrode active material
- SBR styrene butadiene rubber
- CMC carboxymethyl cellulose
- An edge 31c (a part of the edge of the exposed portion 32m) located on one side LA in the width direction LH of the positive electrode plate 31 is one side EC in the axial direction EH from the separator 51 (left side in FIG. 5 and in FIG. 7, it protrudes in a flat spiral shape and forms a positive electrode protruding wound portion 30 c of the electrode body 30. Further, the end edge portion 41c (a part of the end edge side of the exposed portion 42m) located on one side MA in the width direction MH of the negative electrode plate 41 is separated from the separator 51 on the other side ED in the axial direction EH (right side in FIG. 2). On the other hand, it protrudes in a flat spiral shape toward the lower side in FIGS.
- the electrode body 30 includes a positive electrode protruding wound portion 30c, a negative electrode protruding wound portion 30d, and a main body portion 30e when viewed in the axial direction EH (see FIGS. 5 and 2).
- the electrode body 30 is composed of one side curved end portion 30f, the other side curved end portion 30g, and a central portion 30h when viewed in the electrode body width direction GH (see FIGS. 5, 6, and 4).
- the one-side curved end portion 30f is located on one side GA (downward in FIGS. 2, 4, and 6) in the electrode body width direction GH, and the positive electrode plate 31, the negative electrode plate 41, and the separator 51 are provided. It is a portion that is bent into a semi-cylindrical shape and overlaps each other.
- the other side curved end 30g is located on the other side GB (upward in FIGS.
- the electrode body 30 has the battery case 20 in a form in which the electrode body width direction GH is orthogonal to the lid member 23 and the other side curved end 30g is closer to the lid member 23 than the one side curved end 30f. (See FIGS. 2 and 4).
- the positive innermost curved portion 31r, the negative electrode facing portion 41r, and the separator facing portion 51r) are disposed within the one curved end portion 30f of the two curved end portions 30f and 30g (see FIG. 6). .
- the positive innermost curved portion 31r is a portion that is bent with the smallest radius of curvature (largest curvature) of the positive electrode plate 31 and is bent first from the winding start point after discard winding.
- the negative electrode facing portion 41r is located on the radially inner side of the positive innermost curved portion 31r in the negative electrode plate 41 and faces the positive innermost curved portion 31r via the separator 51 (separator facing portion 51r). It is.
- the separator facing portion 51r is a portion of the separator 51 that is interposed between the positive innermost curved portion 31r and the negative electrode facing portion 41r.
- the negative electrode plate 41 and the separator 51 each have a longer dimension in the longitudinal direction than the positive electrode plate 31, and the negative electrode that does not face the positive electrode plate 31 in the most radially inner portion of the electrode body 30. There are a discarded winding portion 41z of the plate 41 and a discarded winding portion 51z of the separator 51 (see FIG. 6).
- a rectangular plate-shaped terminal connection portion 61j of the positive electrode terminal member 60 is connected to the positive electrode connection portion 30cj of the positive electrode protruding winding portion 30c of the electrode body 30.
- the positive electrode connection portion 30cj overlaps the terminal connection portion 61j as viewed in the electrode body thickness direction FH among the end edge portions 31c of the positive electrode plate 31 forming the flat spiral-shaped positive electrode protrusion winding portion 30c (electrode) It consists of all the rectangular plate-like overlapping portions 31ck (which overlap the terminal connecting portion 61j when the terminal connecting portion 61j is projected in the body thickness direction FH). And all the overlapping parts 31ck of this rectangular plate shape are bundled together so that it may mutually overlap, and are integrally welded to the terminal connection part 61j.
- a rectangular plate-like terminal connection portion 71j of the negative electrode terminal member 70 is connected to the negative electrode connection portion 30dj of the negative electrode protruding winding portion 30d of the electrode body 30.
- the negative electrode connection portion 30dj overlaps with the terminal connection portion 71j as viewed in the electrode body thickness direction FH, of the end edge portion 41c of the negative electrode plate 41 that forms the flat spiral negative electrode protrusion winding portion 30d (electrode) It consists of all the rectangular plate-like overlapping portions 41ck (which overlap the terminal connecting portion 71j when the terminal connecting portion 71j is projected in the body thickness direction FH). And all the overlapping parts 41ck of this rectangular plate shape are bundled together so that it may mutually overlap, and are integrally welded to the terminal connection part 71j.
- the electrode body 30 is formed. That is, a positive electrode plate 31, a negative electrode plate 41, and two separators 51, 51 are prepared. The positive electrode plate 31 and the negative electrode plate 41 are overlapped with each other via the separators 51, 51 (see FIG. 7), and a winding core is used. Wind around axis AX. Thereafter, the electrode body 30 is formed by compressing it into a flat shape. At this time, as described above, of the two curved end portions 30f and 30g, the portion located on the innermost periphery of the portion where the positive electrode plate 31 and the negative electrode plate 41 overlap with each other via the separator 51 (the positive innermost curved portion). The portion to which 31r, the negative electrode facing portion 41r, and the separator facing portion 51r belong) is defined as the one-side curved end portion 30f (see FIG. 6).
- the lid member 23, the first terminal members 61 and 71, the second terminal members 62 and 72, the fastening members 65 and 75, the first insulating members 67 and 77, and the second insulating members 68 and 78, Prepare each. And using these, the positive electrode terminal member 60 and the negative electrode terminal member 70 are respectively fixed to the lid member 23 (see FIG. 3).
- the positive electrode terminal member 60 and the negative electrode terminal member 70 are respectively connected to the electrode bodies 30.
- the terminal connection portion 61j extends in the electrode body thickness direction FH. All the overlapping overlapping portions 31ck are pressed in the electrode body thickness direction FH. Then, all the overlapping portions 31ck that overlap each other and are bundled together are welded to the terminal connecting portion 61j (see FIG. 4). Thereby, the positive electrode connection part 30cj is formed in the positive electrode protrusion winding part 30c.
- the case main body 21 and the lid member 23 are welded to form the battery case 20 (see FIGS. 1 and 2).
- the electrolytic solution 27 is injected into the battery case 20 from the injection hole 23h, and the injection hole 23h is hermetically sealed with the sealing member 25.
- the battery is subjected to initial charging and various inspections.
- the battery 10 is completed.
- Example 3 a battery 10 according to the embodiment was prepared.
- the distance Hb from the end 30gt of the other-side GB Hb 14 mm
- the one-side curved end portion 30f including the positive innermost curved portion 31r is located on the bottom 20w side of the battery case 20 (the other-side curved end portion 30g is located on the lid member 23 side of the battery case 20).
- the electrode body 30 is accommodated in the battery case 20.
- “bottom side” is described in the column of “position of one side curved end”.
- Example 1 batteries having the same values as the battery 10 of Example 3 (embodiment) were prepared except that the values of the distances Ha and Hb were different.
- Examples 6 to 9 batteries having a configuration in which one side curved end portion was arranged on the lid member side (the other side curved end portion on the bottom side) were prepared in contrast to Examples 1 to 5.
- the lid member side is written in the “position of the one-side curved end”.
- an “overcharge test” was performed to determine the maximum temperature of the battery. Specifically, the battery is overcharged at a current value of 5C (20A) until the battery voltage reaches 15V, and then the battery is switched to constant voltage charge (CV charge) to continue energization, and the maximum battery temperature (° C) is set. Each was measured. The battery temperature was measured by attaching a T-type thermocouple to the wide side of the battery case.
- the maximum temperature of the battery in the overcharge test was a low temperature of 110 to 122 ° C.
- the reason is presumed to be as follows. That is, as described above, when forming the positive electrode connection portion by welding the terminal connection portion of the positive electrode terminal member to the positive electrode protrusion winding portion of the electrode body, the edge portion of the positive electrode plate forming the positive electrode protrusion winding portion is the electrode. When the edge portions are bundled by pressing in the body thickness direction FH, stress is applied to the separator, and the separator is pulled in the longitudinal direction KH toward the positive electrode connection portion.
- the separator facing portion of the separator facing the positive innermost curved portion (particularly on the positive electrode protruding winding portion side) has its width direction JH (electrode body). It is possible to suppress thermal contraction greatly in the axial direction EH). Therefore, on the positive electrode protruding winding part side (one side EC in the axial direction EH) of the positive innermost curved part where the short circuit is most likely to occur, the positive innermost curved part and the negative electrode facing part of the negative electrode plate facing the positive innermost curved part It was possible to appropriately suppress the occurrence of a short circuit between them. As a result, it is estimated that the maximum temperature of the battery was kept low.
- the maximum temperature of the battery in Example 2 is lower than that in Example 1 because the battery according to Example 2 has a larger value of Ha / Hb, and the positive electrode connection portion is further away from the positive innermost curved portion. This is considered to exist.
- the maximum temperature of the battery in Example 3 is lower than that in Example 2 because the value of Ha / Hb is larger in the battery according to Example 3 and the positive electrode connection portion is the positive innermost curved portion. It is thought that it is because it exists further away from
- the maximum temperature of the battery in Example 4 is higher than that in Example 3 because the value of Ha / Hb is too large in the battery according to Example 4, and conversely, the other side curved end (particularly, It is presumed that a short circuit is likely to occur in the innermost peripheral portion. That is, in the battery according to Example 4, the positive electrode connection portion is far away from the one-side curved end portion (positive electrode innermost peripheral curved portion), but is too close to the other-side curved end portion. For this reason, short-circuiting is less likely to occur at the one-side curved end portion (positive innermost peripheral curved portion), but it is presumed that short-circuiting is likely to occur at the other-side curved end portion (particularly the innermost peripheral portion).
- Example 5 the maximum temperature of the battery in Example 5 is higher than that in Example 4 because the value of Ha / Hb is too large in the battery according to Example 5, and conversely, the other side curved end (particularly, It is presumed that a short circuit is likely to occur in the innermost peripheral portion.
- Example 7 the maximum temperature of the battery in Example 7 is lower than that in Example 6 because the battery according to Example 7 has a larger value of Ha / Hb, and the positive electrode connection portion is from the positive innermost curved portion. This is thought to be because they exist more apart.
- the highest battery temperature in the order of Example 7, Example 8, and Example 9 is because the value of Ha / Hb is large in the battery according to Example 8 and is too large in the battery according to Example 9. On the contrary, it is considered that a short circuit is likely to occur at the other curved end portion (particularly, the innermost peripheral portion).
- Example 1 and Example 6 having the same value of Ha / Hb are compared, the maximum temperature of the battery in Example 1 is lower in the battery according to Example 1 on the one-side curved end portion. Is located on the bottom side (the other curved end is on the lid member side), the dimension of the positive terminal member (the first terminal member) from the positive electrode connection part to the lid member is shortened, and the positive terminal having a shorter dimension This is thought to be because heat was released to the outside of the battery through the member. This is because when comparing Example 4 and Example 8 having the same value of Ha / Hb, Example 4 and Example 9 have the lowest battery maximum temperature and the same value of Ha / Hb. This is also supported by the fact that Example 5 has a lower maximum battery temperature.
- the maximum temperature of the battery in the overcharge test was a high value of 127 to 140 ° C.
- the reason is presumed to be as follows. That is, as described above, when the electrode body abnormally generates heat due to overcharging due to the ease of heat accumulation and the relatively low thermal conductivity of the positive electrode plate, the positive electrode protruding winding part of the innermost curved part of the positive electrode On the side, short circuits are most likely to occur.
- the edge portion of the positive electrode plate forming the positive electrode protruding winding portion is arranged in the electrode body thickness direction FH.
- FH the electrode body thickness direction
- the separator in the portion where such stress is generated is relieved of stress and contracts to return to the state before stretching. For this reason, if this contraction occurs greatly, the positive innermost curved portion of the positive electrode plate (especially, the positive electrode protruding winding portion side in the axial direction of the electrode body) and the negative electrode plate facing it come into contact with each other and a short circuit occurs. Guessed.
- the one-side curved end portion was disposed on the bottom side of the battery case. Further, in the battery according to Example 13, in contrast to Example 10, the one-side curved end portion was disposed on the lid member side of the battery case.
- the one-side curved end portion was disposed on the bottom side of the battery case. Further, in the battery according to Comparative Example 7, contrary to Example 6, the one-side curved end portion was disposed on the lid member side of the battery case.
- the maximum temperature of the battery in Example 11 is lower than that in Example 10 because the value of Ha / Hb is larger in the battery according to Example 11, and the positive electrode connection part is further away from the positive innermost curved part. This is considered to exist.
- the maximum temperature of the battery in Example 12 is higher than that in Example 11 because the value of Ha / Hb is too large in the battery according to Example 12, on the other hand, This is probably because a short circuit easily occurs in the innermost peripheral portion.
- Example 10 and Example 13 having the same value of Ha / Hb are compared, the maximum temperature of the battery in Example 10 is lower in the battery according to Example 10 on the one-side curved end portion. This is considered to be because the dimension of the positive electrode terminal member from the positive electrode connecting portion to the lid member is shortened and heat can be radiated to the outside through the shorter positive electrode terminal member.
- the positive electrode inner peripheral curve of the positive electrode plate 31 is connected to the positive electrode connection portion 30 cj connected to the terminal connection portion 61 j of the positive electrode terminal member 60 in the positive electrode protruding winding portion 30 c of the electrode body 30.
- the positive innermost curved portion 31r is disposed in one curved end portion 30f of the two curved end portions 30f and 30g of the electrode body 30, and then the electrode of the electrode body 30 is connected to the positive electrode connecting portion 30cj.
- the distance Ha from the positive electrode connection portion 30cj to the end 30gt of the other side GB of the electrode body width direction GH of the electrode body 30 is Ha ⁇ 1.1Hb.
- the positive electrode connection portion 30cj is arranged at a position that satisfies the above.
- the positive electrode plate 31 forming the positive electrode protrusion winding portion 30c
- the separator 51 is pulled in the longitudinal direction KH toward the positive electrode connection portion 30cj.
- the separator facing portion 51r (particularly, the electrode) of the separator 51 facing the positive innermost curved portion 31r.
- the stress (tensile stress applied to the longitudinal direction KH of the separator 51) applied to the body 30 in the axial direction EH of the body 30 on the positive electrode protruding winding part 30c side is reduced. For this reason, the separator facing portion 51r is less contracted when the temperature is higher.
- the separator facing portion 51r of the separator 51 facing the positive innermost curved portion 31r (particularly on the positive electrode protruding winding portion 30c side) has its width direction JH (electrode It is possible to suppress thermal contraction greatly in the axial direction EH) of the body 30. Therefore, on the positive electrode protruding winding portion 30c side (one side EC in the axial direction EH) of the positive innermost curved portion 31r that is most likely to be short-circuited, the negative innermost curved portion 31r and the negative electrode of the negative electrode plate 41 facing the positive innermost curved portion 31r. It can suppress appropriately that a short circuit arises between the opposing parts 41r.
- the one side curved end 30f is disposed on the lid member 23 side (the electrode body width direction GH is orthogonal to the lid member 23, and the one side curved end 30f is more than the other side curved end 30g.
- the electrode body 30 may be accommodated in the battery case 20 in the form of the lid member 23 side.
- the other side curved end 30g is disposed on the lid member 23 side (the electrode body width direction GH is orthogonal to the lid member 23, and the other side curved end 30g is one side curved end 30f. It is more preferable that the electrode body 30 is accommodated in the battery case 20 in a form that is closer to the lid member 23 side.
- the distance Ha from the positive electrode connection portion 30cj to which the terminal connection portion 61j of the positive electrode terminal member 60 is connected to the end 30ft of the one-side GA of the electrode body 30 is GB from the positive electrode connection portion 30cj to the other side GB of the electrode body 30.
- the distance Hb is longer than the distance Hb to the end 30gt (specifically, Ha ⁇ 1.1Hb). That is, the distance Hb is shorter than the distance Ha.
- the positive terminal member 60 from the positive electrode connecting portion 30cj to the lid member 23 is more arranged when the other curved end portion 30g is arranged on the lid member 23 side than when the one side curved end portion 30f is arranged on the lid member 23 side. This is because the dimension of (the first terminal member 61) can be shortened, and heat can be radiated to the outside through the positive electrode terminal member 60 having a shorter dimension, so that the heat dissipation can be improved.
- the distance Ha is set to be larger than the distance Hb, that is, the positive electrode connection portion 30cj to which the positive electrode terminal member 60 is connected is far away from the one-side curved end portion 30f (positive electrode innermost peripheral curved portion 31r), while the other side If it is too close to the curved end portion 30g, a short circuit is less likely to occur at the positive innermost curved portion 31r located in the first curved end portion 30f, but at the other curved end portion 30g (particularly, the innermost circumferential portion). Short circuit is likely to occur, which is not preferable.
- the distance Ha and the distance Hb are set to Ha ⁇ 2.5Hb.
- the dimension Hc of the positive electrode connection portion 30cj in the electrode body width direction GH is too large, the distance Ha and the distance Hb are shortened, so that the one-side curved end portion 30f of the electrode body 30 (particularly, the positive innermost curved portion 31r). In addition, a short circuit is likely to occur at the other curved end 30g (particularly the innermost peripheral portion).
- the dimension Hc in the electrode body width direction GH of the positive electrode connection portion 30cj satisfies Hc ⁇ 0.5He with respect to the dimension He in the center portion 30h electrode body width direction GH of the electrode body 30. I am trying. Thereby, the distance Ha and the distance Hb can be appropriately increased.
- the distance Ha and the distance Hb are set to have a size satisfying Ha ⁇ Wa and Hb ⁇ Wa. Thereby, the magnitude
- the positive electrode connection portion 30cj of the positive electrode protruding winding portion 30c is seen in the electrode body thickness direction FH among the edge portions 31c of the positive electrode plate 31 forming the flat spiral winding positive electrode protruding winding portion 30c.
- the overlapping portion 31ck overlaps the terminal connection portion 61j of the positive electrode terminal member 60, and all the overlapping portions 31ck are bundled and welded to the terminal connection portion 61j.
- the separator facing portion 51r facing the positive innermost curved portion 31r of the separator 51 in particular, Large stress (tensile stress applied in the longitudinal direction KH of the separator 51) is likely to occur. For this reason, when the electrode body 30 abnormally generates heat, the separator facing portion 51r is easily contracted greatly.
- the positive electrode innermost curved portion 31 r is disposed in the one-side curved end portion 30 f of the electrode body 30, and the positive electrode is connected in a form satisfying Ha ⁇ 1.1 Hb.
- the part 30cj is arranged.
- Electrode body Positive electrode protruding winding portion, 30cj Positive electrode connecting winding portion 30d Negative electrode protruding winding portion 30e Main body portion 30f One side curved end portion, 30ft (one side curved end portion) end 30g The other side curved end portion, 30gt (the other side End 30h Central portion 31 Edge of positive plate 31c (on one side of positive plate), Overlapping portion 31r (of edge) 31r Positive innermost curved portion 41 Negative plate 41c (one side of negative plate) Edge portion 41r negative electrode facing portion 51 separator 51r separator facing portion 60 positive electrode terminal member 70 negative electrode terminal member 61, 71 first terminal member 61j, 71j (first terminal member) terminal connection portion AX axis (winding shaft) EH axial direction, EC (axial direction) one side, ED (axial direction) other side FH electrode body thickness direction GH electrode body width direction GA (electrode body width direction) one side
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Abstract
Description
次いで、実施形態に係る電池10の効果を検証するために行った試験の結果について説明する。実施例3として、実施形態に係る電池10を用意した。この電池10では、前述のように、正極接続部30cjから電極体30の電極体幅方向GHの一方側GAの端30ftまでの距離HaがHa=23mm、他方側GBの端30gtまでの距離HbがHb=14mmであり、Ha=1.64Hb(Ha/Hb=1.64)である。また、正極最内周湾曲部31rを含む一方側湾曲端部30fが電池ケース20の底部20w側に位置する(他方側湾曲端部30gが電池ケース20の蓋部材23側に位置する)形態で、電極体30が電池ケース20内に収容されている。なお、表中には、「一方側湾曲端部の位置」の欄に「底部側」と表記した。
20 電池ケース
23 蓋部材(端子固定壁部)
30 電極体
30c 正極突出捲回部、30cj 正極接続部
30d 負極突出捲回部
30e 本体部
30f 一方側湾曲端部、30ft(一方側湾曲端部の)端
30g 他方側湾曲端部、30gt(他方側湾曲端部の)端
30h 中央部
31 正極板
31c(正極板の片側の)端縁部、31ck(端縁部の)重なり部
31r 正極最内周湾曲部
41 負極板
41c(負極板の片側の)端縁部
41r 負極対向部
51 セパレータ
51r セパレータ対向部
60 正極端子部材
70 負極端子部材
61,71 第1端子部材
61j,71j(第1端子部材の)端子接続部
AX 軸線(捲回軸)
EH 軸線方向、EC(軸線方向の)一方側、ED(軸線方向の)他方側
FH 電極体厚み方向
GH 電極体幅方向
GA (電極体幅方向の)一方側
GB (電極体幅方向の)他方側
JH (セパレータの)幅方向
KH (セパレータの)長手方向
LH (正極板の)幅方向
LA (正極板の幅方向の)片側
Ha (正極接続部から電極体幅方向の一方側の端までの)距離
Hb (正極接続部から電極体幅方向の他方側の端までの)距離
Hc (正極接続部の電極体幅方向の)寸法
Hd (電極体の電極体幅方向の)寸法
He (中央部の電極体幅方向の)寸法
Hf (一方側湾曲端部及び他方側湾曲端部の電極体幅方向の)寸法
Wa (電極体の)厚み
Claims (6)
- 帯状の正極板とこの正極板よりも熱伝導性が高く帯状の負極板とを帯状で多孔質樹脂からなるセパレータを介して互いに重ねて軸線回りに扁平状に捲回した電極体であって、前記正極板の幅方向片側の端縁部が前記セパレータから軸線方向の一方側に向けて扁平渦巻き状に突出する正極突出捲回部を有する電極体と、
前記電極体の前記正極突出捲回部に端子接続部で接続する正極端子部材と、を備える電池であって、
扁平な前記電極体は、
前記軸線方向及び電極体厚み方向に直交する電極体幅方向の一方側に位置し、前記正極板、前記負極板及び前記セパレータが半円筒状に曲げられて互いに重なる一方側湾曲端部と、
前記電極体幅方向の他方側に位置し、前記正極板、前記負極板及び前記セパレータが半円筒状に曲げられて互いに重なる他方側湾曲端部と、を有し、
前記正極板のうち最も小さな曲率半径で曲げられた正極最内周湾曲部は、前記一方側湾曲端部内に配置されてなり、
前記正極突出捲回部のうち前記端子接続部に接続する正極接続部から前記電極体の前記一方側湾曲端部のうち前記電極体幅方向の一方側の端までの前記電極体幅方向の寸法を距離Haとし、前記正極接続部から前記電極体の前記他方側湾曲端部のうち前記電極体幅方向の他方側の端までの前記電極体幅方向の寸法を距離Hbとしたとき、
前記距離Ha及び前記距離Hbが、Ha≧1.1Hbを満たす位置で、前記正極接続部に前記端子接続部を接続してなる
電池。 - 請求項1に記載の電池であって、
前記電極体を収容すると共に、自身の端子固定壁部に前記正極端子部材を固定して外部に延出させる電池ケースを備え、
前記電極体は、前記電極体幅方向が前記端子固定壁部と直交し、かつ、前記他方側湾曲端部が前記一方側湾曲端部よりも前記端子固定壁部側となる形態で、前記電池ケース内に収容されてなる
電池。 - 請求項1または請求項2に記載の電池であって、
前記距離Ha及び前記距離Hbは、Ha≦2.5Hbを満たす
電池。 - 請求項3に記載の電池であって、
前記電極体のうち前記一方側湾曲端部と前記他方側湾曲端部との間に位置する中央部の前記電極体幅方向の寸法を寸法Heとし、
前記正極接続部の前記電極体幅方向の寸法を寸法Hcとしたとき、
前記寸法Hcは、Hc≦0.5Heを満たす大きさとされてなる
電池。 - 請求項3または請求項4に記載の電池であって、
前記電極体の厚みを厚みWaとしたとき、
前記距離Ha及び前記距離Hbは、Ha≧Wa、かつ、Hb≧Waを満たす
電池。 - 請求項1~請求項5のいずれか一項に記載の電池であって、
前記正極突出捲回部の前記正極接続部は、扁平渦巻き状の前記正極突出捲回部をなす前記端縁部のうち、前記電極体厚み方向に見て、前記正極端子部材の前記端子接続部に重なる重なり部のすべてからなり、
このすべての重なり部が束ねられて前記端子接続部に溶接されてなる
電池。
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PCT/JP2013/051824 WO2014118873A1 (ja) | 2013-01-29 | 2013-01-29 | 電池 |
KR1020157020196A KR101748508B1 (ko) | 2013-01-29 | 2013-01-29 | 전지 |
JP2014559372A JP6199908B2 (ja) | 2013-01-29 | 2013-01-29 | 電池 |
US14/762,640 US9991499B2 (en) | 2013-01-29 | 2013-01-29 | Battery |
CN201380071371.2A CN104956535B (zh) | 2013-01-29 | 2013-01-29 | 电池 |
EP13873469.4A EP2953200B1 (en) | 2013-01-29 | 2013-01-29 | Battery |
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EP (1) | EP2953200B1 (ja) |
JP (1) | JP6199908B2 (ja) |
KR (1) | KR101748508B1 (ja) |
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JP2021111587A (ja) * | 2020-01-15 | 2021-08-02 | トヨタ自動車株式会社 | 二次電池 |
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CN116581395A (zh) | 2016-03-31 | 2023-08-11 | 宁德新能源科技有限公司 | 卷绕式电芯 |
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WO2016066388A1 (de) * | 2014-10-31 | 2016-05-06 | Bayerische Motoren Werke Aktiengesellschaft | Stromsammler für eine elektrochemische energiespeichervorrichtung |
US10700336B2 (en) | 2014-10-31 | 2020-06-30 | Bayerische Motoren Werke Aktiengesellschaft | Current collector for electrochemical energy storage apparatus |
CN106025119A (zh) * | 2015-03-30 | 2016-10-12 | 三洋电机株式会社 | 方形二次电池 |
JP2016189246A (ja) * | 2015-03-30 | 2016-11-04 | 三洋電機株式会社 | 角形二次電池 |
US10177363B2 (en) | 2015-03-30 | 2019-01-08 | Sanyo Electric Co., Ltd. | Prismatic secondary battery |
CN106025119B (zh) * | 2015-03-30 | 2020-09-22 | 三洋电机株式会社 | 方形二次电池 |
WO2020059131A1 (ja) * | 2018-09-21 | 2020-03-26 | 株式会社 東芝 | 電池及び電池パック |
US12027672B2 (en) | 2018-09-21 | 2024-07-02 | Kabushiki Kaisha Toshiba | Battery and battery pack |
JP2021089856A (ja) * | 2019-12-04 | 2021-06-10 | トヨタ自動車株式会社 | 二次電池およびその製造方法 |
JP7236035B2 (ja) | 2019-12-04 | 2023-03-09 | トヨタ自動車株式会社 | 二次電池およびその製造方法 |
JP2021111587A (ja) * | 2020-01-15 | 2021-08-02 | トヨタ自動車株式会社 | 二次電池 |
JP7417840B2 (ja) | 2020-01-15 | 2024-01-19 | トヨタ自動車株式会社 | 二次電池 |
Also Published As
Publication number | Publication date |
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CN104956535B (zh) | 2018-02-23 |
KR20150103114A (ko) | 2015-09-09 |
EP2953200B1 (en) | 2018-08-22 |
JPWO2014118873A1 (ja) | 2017-01-26 |
US9991499B2 (en) | 2018-06-05 |
EP2953200A4 (en) | 2015-12-30 |
CN104956535A (zh) | 2015-09-30 |
KR101748508B1 (ko) | 2017-06-16 |
JP6199908B2 (ja) | 2017-09-20 |
US20150325832A1 (en) | 2015-11-12 |
EP2953200A1 (en) | 2015-12-09 |
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