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WO2018131417A1 - Batterie secondaire rectangulaire - Google Patents

Batterie secondaire rectangulaire Download PDF

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Publication number
WO2018131417A1
WO2018131417A1 PCT/JP2017/045871 JP2017045871W WO2018131417A1 WO 2018131417 A1 WO2018131417 A1 WO 2018131417A1 JP 2017045871 W JP2017045871 W JP 2017045871W WO 2018131417 A1 WO2018131417 A1 WO 2018131417A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery
storage element
insulating film
secondary battery
metal foil
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.)
Ceased
Application number
PCT/JP2017/045871
Other languages
English (en)
Japanese (ja)
Inventor
和昭 浦野
佐藤　豊
伸芳 田中
博昭 江川
佳佑 澤田
渡辺　聡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Astemo Ltd
Original Assignee
Hitachi Automotive Systems Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Automotive Systems Ltd filed Critical Hitachi Automotive Systems Ltd
Priority to JP2018561895A priority Critical patent/JP6718985B2/ja
Publication of WO2018131417A1 publication Critical patent/WO2018131417A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • 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
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H01M50/469—Separators, membranes or diaphragms characterised by their shape tubular or cylindrical
    • 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

Definitions

  • the present invention relates to a prismatic secondary battery used for in-vehicle applications.
  • a power storage element that constitutes a positive electrode and a negative electrode, and an internal space includes a rectangular metal container corresponding to the power storage element, and the power storage element and the metal container are isolated between the power storage element and the metal container.
  • An insulating film is provided. And the said insulating film is formed in the bag shape surrounding the said electrical storage element. Since the storage element tends to be set to reduce the gap between the metal containers as much as possible in order to improve the capacity, when inserting the storage element surrounded by the insulating film into the metal container, The mixture layer is pressed through the insulating film from the wide surface of the metal container.
  • the insulating film spreads around to extend the deflection before insertion, but if the insulating film is bag-shaped, the insulating film that tries to extend in the storage element lateral direction (axial direction) contacts the short side of the metal container As a result, the film is wrinkled between the wide surface mixture layer of the electricity storage element and the wide surface of the metal container, and the wrinkle unevenness of the film is formed in the material mixture layer. There is a risk of performance degradation from receiving pressure.
  • the present invention prevents the damage to the mixture layer by making the insulating film between the mixture layer and the metal container a uniform surface, and is a wound group against an external force.
  • the purpose is to provide a prismatic secondary battery with improved insulation of the can.
  • the present application relates to an insulating film, which is composed of a single film folded so as to sandwich a power storage element, and the metal foil in a state where the films overlap each other on at least one side of the exposed metal foil layer.
  • the exposed layer has a portion protruding from one end of the exposed layer, and a part of the protruding overlapping portion is in contact with the surface of the metal container facing the direction in which the film protrudes to protrude the overlapping portion
  • the tip of is disposed in the space between the electricity storage element and the corner of the rectangular metal container.
  • the present invention by making the insulating film between the mixture layer and the metal container a uniform surface, distortion damage to the mixture layer is prevented, and the wound group and the can of the can are against external force. Insulation can be enhanced.
  • the disassembled perspective view removed from the electric can of the square battery of FIG. The disassembled perspective view of the winding electrode body in the square battery of FIG.
  • the perspective view of the insulating sheet in the square battery of FIG. The front view in the square battery of FIG. 1, and sectional drawing of a side short surface part.
  • the figure which showed 5th Embodiment by this invention. The figure which showed the principle of this invention.
  • Embodiment 1 [Overall structure of prismatic battery]
  • a prismatic storage battery according to the present invention will be described with reference to the drawings, taking a lithium ion prismatic secondary battery as an embodiment.
  • FIG. 1 is an external perspective view showing an embodiment of the prismatic storage battery of the present invention
  • FIG. 2 is an exploded perspective view taken out from the battery can 4 of the prismatic storage battery shown in FIG.
  • the rectangular storage battery 1 includes a wound electrode body 40 housed in a thin, substantially rectangular parallelepiped metal container 2 composed of a battery lid (lid member) 3 and a battery can 4.
  • the liquid is injected and configured.
  • the battery lid 3 and the battery can 4 are made of, for example, aluminum, iron, stainless steel, or the like.
  • the battery lid 3 is formed with a liquid injection plug 11 and a safety valve 13, and an external positive terminal 61 and a negative external terminal 71 are disposed at both ends, respectively.
  • a positive electrode current collector plate 21, a negative electrode current collector plate 31, and the like are integrally assembled with the battery cover 3 to constitute a battery cover unit 10.
  • the positive electrode current collector plate 21 and the negative electrode current collector plate 31 of the battery lid unit 10 are respectively joined to the positive electrode metal foil or the negative electrode current collector foil of the electrode group 40 by, for example, ultrasonic welding, thereby collecting the current collector 23.
  • 33 and the wound electrode body 40 are integrated to form a power generation element 50, which is received from the opening at the upper end of the battery can 4.
  • the power generation element 50 is configured to be insulated so as not to touch the battery can 4 directly and covered in the can by covering the periphery with the insulating sheet 14 covering the application region of the electrode mixture layer.
  • FIG. 3 is an external perspective view showing a state in which the end of winding of the electrode group 40 is developed.
  • the wound electrode body 40 is formed by winding a positive electrode 41 and a negative electrode 42 in a flat shape with the first and second separators 43 and 44 interposed therebetween.
  • the positive electrode 41 is obtained by forming a positive electrode mixture layer 41b on both front and back surfaces of a positive metal foil 41a made of, for example, aluminum foil.
  • the positive electrode mixture layer 41b is formed by coating the positive electrode metal foil 41a with the positive electrode mixture so that the positive electrode mixture untreated portion 41c with the positive electrode metal foil 41a exposed at one side edge is formed.
  • the negative electrode 42 is obtained by coating a negative electrode mixture layer 42b on both front and back surfaces of a negative electrode metal foil 42a made of, for example, copper foil.
  • a negative electrode mixture untreated portion 42c in which the negative electrode metal foil 42a is exposed is formed on the other side edge that is a side edge opposite to the side edge where the positive electrode mixture untreated portion 41c is disposed. In this way, the negative electrode metal foil 42a is formed by coating the positive electrode mixture.
  • the positive electrode mixture layer 41b adds 10 parts by weight of flaky graphite as a conductive material and 10 parts by weight of PVDF as a binder with respect to 100 parts by weight of lithium manganate (chemical formula LiMn 2 O 4 ) as a positive electrode active material. Then, NMP is added as a dispersion solvent and kneaded. This positive electrode mixture is applied to both surfaces of an aluminum foil having a thickness of 20 ⁇ m, leaving the positive electrode mixture untreated portions 41c. Thereafter, drying, pressing, and cutting are performed to obtain a positive electrode 41 having a thickness of 90 ⁇ m (total of both front and back surfaces) of the positive electrode active material application portion not including the aluminum foil.
  • the negative electrode mixture layer 42b 10 parts by weight of polyvinylidene fluoride (hereinafter referred to as PVDF) is added as a binder to 100 parts by weight of amorphous carbon powder as a negative electrode active material, and a dispersion solvent is added thereto. N-methyl pyrrolidone (hereinafter referred to as NMP) is added and kneaded.
  • NMP N-methyl pyrrolidone
  • This negative electrode mixture is applied to both sides of a 10 ⁇ m thick copper foil leaving the negative electrode mixture untreated portions 42c. Thereafter, drying, pressing, and cutting are performed to obtain a negative electrode 42 having a thickness of 70 ⁇ m (total on both front and back surfaces) of the negative electrode active material coating portion not including the copper foil.
  • the winding start side end of the negative electrode 42 is positioned inside the winding start side end of the positive electrode 41 between the first and second separators 43 and 44, respectively. Arrange to wind up.
  • the positive electrode mixture untreated portion 41c and the negative electrode mixture untreated portion 42c are arranged so as to be located on the side edges on the opposite side in the width direction (direction orthogonal to the winding direction).
  • the width of the negative electrode mixture layer 42b in other words, the length in the direction orthogonal to the winding direction is formed wider than the width of the positive electrode mixture layer 41b.
  • variety of the 1st separator 43 is set as the dimension which exposes the positive mix untreated part 41c of the positive electrode 41 to the exterior in the one side edge side.
  • the width of the second separator 44 is such that the negative electrode mixture untreated portion 42c of the negative electrode 42 is exposed to the outside on the other side edge side.
  • a hollow portion 40a (see FIG. 3) is formed on the winding start side of the electrode group 40. Further, the winding electrode 40 has a winding end side with the second separator 44 at the outermost periphery and the negative electrode 42 inside. Therefore, the positive electrode mixture layer 41b covers the entire length from the winding start side to the winding end side, and all portions thereof are covered with the negative electrode mixture layer 42b also in the width direction.
  • the positive electrode mixture untreated portion 41c of the positive electrode metal foil 41a is exposed to the outside in the positive electrode 41, and the negative electrode combination of the negative electrode metal foil 42a in the negative electrode 42.
  • the agent untreated part 42c is exposed to the outside.
  • the battery lid 3 is provided with a liquid injection port (not shown) for injecting a non-aqueous electrolyte. Further, the battery lid 3 is provided with a safety valve 13 for releasing the pressure when the internal pressure exceeds the reference value due to overcharge or the like.
  • lithium hexafluorophosphate LiPF 6
  • ethylene carbonate and dimethyl carbonate are mixed at a volume ratio of 1: 2.
  • the injection port 11 is fitted with an injection plug 11 after the injection of the electrolyte and is closed by laser welding.
  • the battery lid 3 is joined to the battery can 4 by laser welding and sealed.
  • the battery lid assembly 10 includes a battery lid 3, a positive electrode side terminal component 60, and a negative electrode side terminal component 70.
  • the positive electrode side terminal component 60 includes a positive electrode external terminal 61, an insulating plate 64 disposed between the positive electrode external terminal 61 and the battery cover 3, and a positive electrode current collector plate 21 connected to the positive electrode external terminal 61. .
  • the positive external terminal 61 and the positive current collector 21 are fixed integrally as described above and attached to the battery lid 3.
  • the positive electrode side terminal component 60 is produced as follows.
  • the positive electrode current collector plate 21 is fixed to the lower surface of the battery lid 3 via an insulating member 64 and is disposed inside the metal container 2.
  • the positive external terminal 61 is fixed to the upper surface of the battery lid 3 via the insulating member 64 and is disposed outside the metal container 2.
  • the positive electrode current collector plate 21 and the positive electrode external terminal 61 are caulked and fixed by a connection terminal penetrating the battery lid 3 and are electrically connected via the connection terminal.
  • the positive electrode current collector plate 21 and the positive electrode external terminal 61 are made of, for example, aluminum or an aluminum alloy.
  • the negative electrode current collector plate 31 is fixed to the lower surface of the battery lid 3 via an insulating member 74 and is disposed inside the battery container 2.
  • the negative external terminal 71 is fixed to the upper surface of the battery lid 3 via the insulating member 75 and is disposed outside the battery container 2. Although illustration is omitted, the negative electrode current collector 31 and the negative electrode external terminal 71 are caulked and fixed by a connection terminal penetrating the battery lid 3 and electrically connected via the connection terminal.
  • the negative electrode current collector 31 and the negative electrode external terminal 71 are made of, for example, copper or a copper alloy.
  • the positive electrode current collecting plate 21 and the negative electrode current collecting plate 31 are joined to the wound electrode body 40, respectively, so that the prismatic storage battery 1 is connected to the external electronic device connected to the external positive electrode terminal 61 and the external negative electrode terminal 71.
  • charging / discharging is possible.
  • the lid assembly 10 is configured by fixing the positive electrode external terminal 61, the negative electrode external terminal 71, the positive electrode current collector plate 21, the negative electrode current collector plate 31 and the like to the battery lid 3. Further, the foil exposed portions 41 c and 42 c of the wound electrode body 40 are joined and fixed to the current collector plates 23 and 33, and the wound electrode body 40 is supported between the positive electrode and the negative electrode current collector plates 21 and 31. Thereby, the electrical storage element 50 is comprised. In the present invention, the combination of the current collector plate and the electrode body is referred to as a power storage element 50.
  • FIG. 4 is a perspective view in which the rectangular battery of FIG. 1 is taken out from the battery can 4 and disassembled, and the insulating film 14 is a piece of film that is folded so as to sandwich the power storage element 50 from the bottom direction facing the battery lid 3. The upper end portion and the left and right end face portions are open.
  • the end of the insulating film 14 protrudes from the metal exposed part, and the films through the wound electrode body 40 It overlaps at the protrusion.
  • One part outer surface of one side of the protruding overlapping portion forms contact portions 14a and 14b that contact the short side surface of the battery can 40 facing the direction in which the insulating film protrudes. Since the insulating film of the abutted portion is in contact with the short side surface of the battery can 4, there is no particular restriction or resistance, and the other insulating film is folded back. , Not subject to restrictions or resistance.
  • FIG. 5 shows the positional relationship between the protruding portions (contact portions 14 a and 14 b) of the insulating film 14 and the corners of the battery can 4.
  • An upper view of FIG. 5 is an external view of the prismatic storage battery 1.
  • the lower diagram of FIG. 5 is a diagram in which the rectangular storage battery 1 of the upper diagram is cut along the AA section. Insulating films (protruding portions) from the contact portions 14 a and 14 b to the tip of the insulating film 14 are particularly arranged in the space 4 b between the electricity storage element 50 and the corner portion 4 a of the rectangular battery can 4. It can move freely without being forced or constrained by the surroundings, and the electricity storage element 50 and the battery can 4 are electrically isolated.
  • the space between the electricity storage element 50 and the corner of the rectangular battery can 4 is a metal exposed portion where the mixture layer of the electricity storage element 50 is not applied and the corner of the battery can 4.
  • the portion there is a space for which the mixture layer is not applied, and even if thin insulating films overlap, for example, 5 to 6 sheets, the space is sufficient.
  • the power storage element 50 When the power storage element 50 is inserted into the battery can 4, it also serves to protect the separator and is pushed in while being surrounded by the insulating film 14. At that time, the wound electrode body 40 is pressed from the battery can 4 at the long side. The slackness of the insulating film that occurs when the thickness shrinks, and the slackness that is originally dimensional, is stretched and the film that has been loosened to the surroundings tends to move. At this time, the film moved in the axial direction of the wound electrode body 40 hits the short side surface of the battery can 4, and the loose film is interposed between the mixture layer of the wound electrode body 40 and the battery can 4. There is a risk of biting with wrinkles.
  • the protrusions 14a and 14b of the insulating film 14 protruding from the wound electrode body 40 are folded back to the long side surface of the wound electrode body 40, and the tips of the protrusions 14a and 14b are mixed.
  • the length is such that it does not reach the layer stack (the tips of the protrusions 14a and 14b are arranged in space).
  • FIG. 10A is the structure where the length of the protrusion part 14a of the insulating film 14 is short, and the front-end
  • the left figure of FIG. 10A shows the positional relationship between the insulating film 14 and the battery can 4 before the wound electrode body 40 is inserted into the battery can 4. As the wound electrode body 40 is inserted into the battery can 4, the insulating film 14 is stretched in the direction of the arrow in the left figure.
  • FIG. 10 (b) shows the wrinkle suppression principle of the present invention.
  • the left view of FIG. 10B shows the positional relationship between the insulating film 14 and the battery can 4 before the wound electrode body 40 is inserted into the battery can 4.
  • the insulating film 14 is stretched in the direction of the arrow in the left figure.
  • FIG. 10A in a state where the protruding portion 14a is bent in the long side surface direction of the wound electrode group, a part of the protruding portion 14a contacts the short side surface of the battery can 4, and the battery can 4 It will be inserted inside.
  • the tip end portion of the protruding portion 14a moves in the axial direction of the wound electrode group and absorbs film variations, so that wrinkles that occur in the wound axis direction can be suppressed. Therefore, when wrinkles enter between the long side surface of the battery can 4 and the wound electrode body 40, when the prismatic storage battery 1 is tied up, a difference in pressing force due to the unevenness of the wrinkles occurs, which promotes battery deterioration. Is prevented.
  • the protruding insulating film 14 is not positioned so that the long side surface of the battery can 4 and the mixture layer portion of the wound electrode body 40 are in close contact with each other through the film, and the protruding portion (contact portion 14a, It does not hinder the movement of 14b).
  • the storage element 50 and the square shape are not brought into contact with the short side surface of the battery can 4 by moving the slack portion of the insulating film generated when the storage element 50 is inserted into the battery can 4.
  • an insulating film is formed between the mixture layer of the wound electrode body 40 and the battery can 4 without loosening the film. There is no risk of biting with 14 wrinkles. Therefore, it is possible to suppress the breaking of the insulating film 14 due to the biting of the insulating film 14 and the influence on the subsequent lashing.
  • the insulating resin material is a synthetic resin material that has good insulation properties, is difficult to be wrinkled, and has high heat resistance.
  • Polyolefin-based resin materials such as polyethylene, polyester, polyphenylene sulfide, polyimide, etc. can be preferably used, and the thickness is considered to be about 25 ⁇ m to 100 ⁇ m, but can be changed according to the configuration of the battery It is.
  • the electrode body is the wound electrode body 40, but a laminated electrode body in which electrodes are laminated may be used.
  • the prismatic lithium ion secondary battery according to the first embodiment described above can achieve the following operational effects.
  • the storage element 50 and the corner of the rectangular battery can 4 are not moved against the short side surface of the battery can 4 while the movement of the slack portion of the insulating film generated when the storage element 50 is inserted into the battery can 4 is abutted. Since the slack can be absorbed in the space between the parts and the film can be absorbed, the film can be bitten while the film is wrinkled between the mixture layer of the wound electrode body 40 and the battery can 4 without being loosened. There is no fear of getting in. Therefore, the mixture layer of the wound electrode body 40 and the battery can 4 can be in contact with each other with a uniform film, and the quality can be stabilized without causing uneven damage to the mixture layer. .
  • Embodiment 2 will be described.
  • the difference between the second embodiment and the first embodiment is that the insulating film 14 is folded at an overlapping portion protruding from the mixture layer exposed portion, and the insulating films 14 in the folded portion are at least overlapped with each other. It is a point that a part is fixed.
  • FIG. 6 is a perspective view showing an insulating film 14 according to Embodiment 2 of the present invention.
  • the upper diagram of FIG. 6 shows the projections 14a and 14b before folding, and the lower diagram of FIG. 6 shows the projections 14a and 14b after folding.
  • the upper diagram of FIG. 6 will be described.
  • the insulating film 14 formed of one sheet is folded in half from the bottom surface side of the wound electrode body 40 to cover the two wide surfaces of the wound electrode body 40.
  • both ends of the insulating film 14 folded in two protrude from the current collector plates 23 and 33, respectively, and projecting portions 14a and 14b are formed.
  • the protruding portions 14a and 14b that protrude are fixed to each other at the portions where the front and back films overlap to form a fixed portion 14c.
  • a fixing method in addition to thermal welding and ultrasonic welding, bonding with an adhesive or the like can be considered.
  • the fixing portion 14c is partially provided. For example, as shown in FIG. 6, when fixing at three points, there is a gap between the fixing portions 14c, so that the electrolyte permeates the wound electrode body side.
  • the protruding portions 14a and 14b are bent to the wide surface side of the wound electrode body 40 and stored in the battery can 4 as shown in the lower diagram of FIG.
  • the protruding portions 14a and 14b may be bent in the same direction of the wound electrode body or in the opposite direction.
  • the fixing portions 14 c are formed on the protruding portions 14 a and 14 b of the insulating film 14.
  • the insulating film can be easily bent when the power storage element 50 is inserted into the battery can 4, and the production and assembly can be improved.
  • the fixing portion 14c is partially provided in the protruding portions 14a and 14b, so that the electrolytic solution easily permeates from between the fixing portions 14c and leads to suppression of deterioration of the electricity storage element 50.
  • Embodiment 3 will be described.
  • the difference between the third embodiment and the first embodiment is that the side surfaces of the current collector plates 23 and 33 (the portion facing the short side surface of the battery can 4) are covered with a plurality of insulating films 14.
  • FIG. 7 is a cross-sectional view of the short side portion on the prismatic battery side according to Embodiment 3 of the present invention.
  • FIG. 7 is a diagram cut along the AA section in the upper diagram of FIG. In this embodiment, the folding position of the overlapping portions (protruding portions 14a and 14b) of the protruding insulating film 14 is shifted to the current collecting plates 23 and 33 side, and connected to the exposed metal foil portion disposed in the protruding direction of the film.
  • the side surfaces of the current collector plates 23 and 33 were covered with three films.
  • the number of overlapping films changes. Therefore, the mixture layer exposed portion is bundled and the current collector plates 23 and 33 are joined, and the position where the insulating film is bent is the central axis of the power storage element of the current collector plates 23 and 33 at the end of the mixture layer exposed portion. It is bent at a position farther from the current collector than C. In other words, a bent portion that is bent toward the current collector plate 23 is formed between the current collector 23 and the long side surface of the battery can 4.
  • the three films can be folded and positioned between the current collector end and the short side surface of the storage container.
  • the number of the insulating films 14 disposed on the side surfaces of the current collector plates 23 and 33 is three.
  • the protruding portions 14a and 14b may be further bent to increase the number of laminated insulating films 14. .
  • the short side surfaces of the current collector plates 23 and 33 are firmly protected, and the current collector plates 23 and 33 and the opening of the battery can 4 come into contact with each other and the film is cut. Risk can be reduced.
  • the folding position of the insulating film 14 is formed between the current collector 23 and the long side surface of the battery can 4.
  • Embodiment 4 will be described.
  • the difference between the fourth embodiment and the first embodiment is that the lower end portions of the projecting portions 14a and 14b are bent or cut away to the inside of the insulating film 14.
  • FIG. 8 is a view of the insulating film 14 according to Embodiment 4 of the present invention as viewed from the long side surface of the wound electrode body 40, and the lower view of FIG. 8 is the insulating film 14 according to Embodiment 4 of the present invention. It is a perspective view.
  • the battery can 4 has a bottom surface portion facing the power storage element, and is a surface on the bottom surface portion side of the film, and at least one end portion on the projecting direction side of the film is on the side where the wound electrode body 40 is disposed. A portion 100 which is bent and has a chamfered shape is formed.
  • the chamfered portion 100 can be cut as well as bent. Thus, when the power storage element 50 is inserted into the battery can 4, the bottom surface of the portion where the insulating film is folded into the mixture layer can be smoothly inserted without being caught by the battery can 4.
  • Embodiment 5 will be described.
  • the difference of Embodiment 5 from Embodiment 1 is that the surface of the insulating film 14 is on the bottom surface side, and slits 110 are formed at two locations on at least one end portion on the projecting direction side of the film. It is.
  • FIG. 9 The upper diagram of FIG. 9 is a diagram showing the projections 14a and 14b of the insulating film 14 according to the fifth embodiment before folding, and the lower diagram of FIG. 9 is the diagram after the projections 14a and 14b of the insulating film 14 according to the fifth embodiment are folded.
  • FIG. 9 The upper diagram of FIG. 9 is a diagram showing the projections 14a and 14b of the insulating film 14 according to the fifth embodiment before folding, and the lower diagram of FIG. 9 is the diagram after the projections 14a and 14b of the insulating film 14 according to the fifth embodiment are folded.
  • the battery can 4 has a bottom portion facing the wound electrode body 40.
  • the two slits 110 are formed on at least one end on the bottom surface side of the insulating film 14 on the projecting direction side of the film.
  • the protruding portions 14a and 14b of the insulating film 14 protruding from the side surface of the wound electrode body 40 are bent inside the battery, but the bottom protruding portion 111 provided by the slit protruded. It remains in a state.
  • the protruding bottom protrusion 111 is bent at the side surface.
  • the film is bent in the direction of the battery lid 3 so as to wrap the film, and the power storage element 50 can be accommodated in the battery can 4 by a simple process, and the function of guiding the power storage element 50 into the battery can 4 also works. Can be inserted more smoothly.
  • the bottom surface has a slit, even if free liquid that could not infiltrate the wound group after injecting the electrolyte was generated, the flow path inside and outside the film could be retained, so It does not impede impregnation into the wound group.
  • the two slits 110 are formed on at least one end on the bottom surface side of the insulating film 14 on the projecting direction side of the film.
  • the power storage element 50 can be housed in the battery can 4 in a simple process, and the function of guiding the power storage element 50 into the battery can 4 also works, so that the power storage element 50 can be more smoothly installed.
  • the battery can 4 can be inserted.
  • the bottom surface has slits, the flow paths inside and outside the film can be maintained even if free liquid that cannot infiltrate the wound group after injecting the electrolyte is generated.
  • the secondary battery according to the present invention includes a portion where a mixture layer (41b, 42b) in which a mixture is applied to a metal foil (41a, 42a) and a metal foil exposed portion (where a metal foil is exposed) ( 41c, 42c) and a power storage element (50) composed of a current collector (23, 33) connected to the metal foil exposed portion (41c, 42c), and a power storage element (50).
  • the insulating film (14) is folded on the bottom side of the battery can (4) to cover the power storage element (50), protrudes from the power storage element (50), and faces the side surface of the battery can (4). And have protrusions (14a, 14b) with insulating film (14) overlapped. Part of the protrusions (14a, 14b) abuts on the side surface facing the direction in which the insulating film (14) protrudes, and the tips of the protrusions (14a, 14b) have a rectangular shape with the electricity storage element (50). It arrange
  • the secondary battery of the present invention has a portion where the mixture layer (41b, 42b) in which the mixture is applied to the metal foil (41a, 42a) and a metal foil exposed portion where the metal foil is exposed.
  • a power storage element (50) composed of an electrode body (40) that performs (41c, 42c) and a current collector (23, 33) connected to the metal foil exposed portion (41c, 42c); 50) a rectangular battery can (4) having a single insulating film 14 covering the power storage element (50) and the insulating film (14) and having an opening, a bottom surface, and a side surface connected to the bottom surface.
  • the insulating film (14) is folded on the bottom side of the battery can (4) to cover the power storage element (50), protrudes from the power storage element (50), faces the side of the battery can, and the insulating film ( 14)
  • the overlapping protrusions (14a, 14b) The protrusions (14a, 14b) are in contact with the side surface facing the direction in which the insulating film (14) protrudes and are bent toward the power storage element (50), and the tips of the protrusions (14a, 14b) The part where the mixture layer of the element is arranged is not reached.
  • the storage element 50 and the square shape can be formed without causing the movement of the slack portion of the insulating film 14 generated when the storage element 50 is inserted into the battery can 4 to abut on the short side of the battery can 4.
  • the slack which moves freely in the space between the corners of the shaped battery can 4 can be absorbed. Therefore, there is no possibility that the film is bitten in a state where wrinkles are generated between the mixture layer of the wound electrode body 40 and the battery can 4 without the film being loosened. Therefore, the mixture layer of the wound electrode body 40 and the battery can 4 can be in contact with each other with a uniform film, and the quality can be stabilized without causing uneven damage to the mixture layer. .
  • the secondary battery according to the present invention has a fixing portion (14c) to which at least a part of the protruding portions (14a, 14b) is fixed.
  • a fixing portion (14c) to which at least a part of the protruding portions (14a, 14b) is fixed.
  • the fixing portion (14c) is fixed by adhesion or welding.
  • the protrusions (14a, 14b) are provided between the current collector (23, 33) and the side surface of the battery can (4) facing the current collector (23, 33). Then, it is folded back to the current collector side.
  • the three films can be positioned between the current collector end and the short side surface of the power storage container so that the current collector plate is inserted when the power storage element 50 is inserted into the battery can 4. 23 and 33 and the opening of the battery can 4 can reduce the risk of the film being cut.
  • the protruding portion on the battery can bottom side has a chamfered shape.
  • the insulating film 14 has at least two slits formed on the bottom surface side of the battery can.
  • the bottom protrusion 111 provided by the slit is formed, and this bottom protrusion 111 is bent in the direction of the battery lid 3 so as to wrap the folded film on the side surface, and is a simple process.
  • the power storage element 50 can be housed in the battery can 4, and the function of guiding the power storage element 50 into the battery can 4 also works, so that the power storage element 50 can be inserted more smoothly than in the first embodiment.
  • the bottom surface has slits, the flow paths inside and outside the film can be maintained even if free liquid that cannot be infiltrated into the wound group after injection of the electrolytic solution is generated.
  • the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed.
  • the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described.
  • a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Cell Separators (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

Le but de la présente invention est de stabiliser la qualité en assurant une surface uniforme pour une couche de mélange, en ce qui concerne l'isolation entre la couche de mélange et un boîtier de batterie, et d'assurer des propriétés isolantes vis-à-vis des forces externes. La présente invention comprend : un élément de stockage de charge constitué d'une partie où une couche de mélange obtenue par revêtement d'un mélange sur une feuille métallique est disposée, un corps d'électrode ayant une partie exposée de feuille métallique où la feuille métallique est exposée, et un collecteur connecté à la partie exposée de feuille métallique; un film isolant recouvrant l'élément de stockage de charge; et un boîtier de batterie rectangulaire qui stocke l'élément de stockage de charge et le film isolant et qui a une ouverture, une surface inférieure et une surface latérale se raccordant à la surface inférieure. Le film isolant a une partie saillante qui se replie sur le côté de surface inférieure du boîtier de batterie et recouvre l'élément de stockage de charge, fait saillie à partir de l'élément de stockage de charge et fait face à la surface latérale du boîtier de batterie, et chevauche le film isolant. Une partie de la partie saillante vient en butée contre une surface latérale orientée vers une direction dans laquelle le film isolant fait saillie, et l'extrémité distale de la partie saillante est disposée dans un espace entre l'élément de stockage de charge et un coin du boîtier de batterie rectangulaire.
PCT/JP2017/045871 2017-01-10 2017-12-21 Batterie secondaire rectangulaire Ceased WO2018131417A1 (fr)

Priority Applications (1)

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JP2018561895A JP6718985B2 (ja) 2017-01-10 2017-12-21 角形二次電池

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JP2017-001546 2017-01-10
JP2017001546 2017-01-10

Publications (1)

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WO2018131417A1 true WO2018131417A1 (fr) 2018-07-19

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JP (1) JP6718985B2 (fr)
WO (1) WO2018131417A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11664525B2 (en) 2020-05-08 2023-05-30 Gs Yuasa International Ltd. Method for manufacturing energy storage device and energy storage device
WO2023137976A1 (fr) * 2022-01-24 2023-07-27 宁德时代新能源科技股份有限公司 Élément de batterie, batterie et dispositif électrique
EP4481902A1 (fr) * 2023-06-21 2024-12-25 Prime Planet Energy & Solutions, Inc. Dispositif de stockage d'électricité et procédé de fabrication de dispositif de stockage d'électricité
WO2025107998A1 (fr) * 2023-11-24 2025-05-30 兰钧新能源科技有限公司 Ensemble élément de batterie, batterie et dispositif électrique

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JP2009026704A (ja) * 2007-07-23 2009-02-05 Toyota Motor Corp 電池
JP2012151099A (ja) * 2010-12-28 2012-08-09 Gs Yuasa Corp 蓄電素子
JP2014041724A (ja) * 2012-08-21 2014-03-06 Toyota Industries Corp 蓄電装置、及び電極組立体の製造方法
JP2016062645A (ja) * 2014-09-12 2016-04-25 トヨタ自動車株式会社 電池
JP2016100046A (ja) * 2014-11-18 2016-05-30 日立オートモティブシステムズ株式会社 角形二次電池

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JP5452303B2 (ja) * 2010-03-23 2014-03-26 日立ビークルエナジー株式会社 二次電池とその製造方法

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Publication number Priority date Publication date Assignee Title
JP2009026704A (ja) * 2007-07-23 2009-02-05 Toyota Motor Corp 電池
JP2012151099A (ja) * 2010-12-28 2012-08-09 Gs Yuasa Corp 蓄電素子
JP2014041724A (ja) * 2012-08-21 2014-03-06 Toyota Industries Corp 蓄電装置、及び電極組立体の製造方法
JP2016062645A (ja) * 2014-09-12 2016-04-25 トヨタ自動車株式会社 電池
JP2016100046A (ja) * 2014-11-18 2016-05-30 日立オートモティブシステムズ株式会社 角形二次電池

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11664525B2 (en) 2020-05-08 2023-05-30 Gs Yuasa International Ltd. Method for manufacturing energy storage device and energy storage device
WO2023137976A1 (fr) * 2022-01-24 2023-07-27 宁德时代新能源科技股份有限公司 Élément de batterie, batterie et dispositif électrique
EP4481902A1 (fr) * 2023-06-21 2024-12-25 Prime Planet Energy & Solutions, Inc. Dispositif de stockage d'électricité et procédé de fabrication de dispositif de stockage d'électricité
WO2025107998A1 (fr) * 2023-11-24 2025-05-30 兰钧新能源科技有限公司 Ensemble élément de batterie, batterie et dispositif électrique

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JP6718985B2 (ja) 2020-07-08

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