WO2017047473A1 - Batterie - Google Patents

Batterie Download PDF

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Publication number
WO2017047473A1
WO2017047473A1 PCT/JP2016/076344 JP2016076344W WO2017047473A1 WO 2017047473 A1 WO2017047473 A1 WO 2017047473A1 JP 2016076344 W JP2016076344 W JP 2016076344W WO 2017047473 A1 WO2017047473 A1 WO 2017047473A1
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WO
WIPO (PCT)
Prior art keywords
separator
exterior material
battery
film exterior
welded
Prior art date
Application number
PCT/JP2016/076344
Other languages
English (en)
Japanese (ja)
Inventor
育央 小嶋
Original Assignee
Ｎｅｃエナジーデバイス株式会社
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 Ｎｅｃエナジーデバイス株式会社 filed Critical Ｎｅｃエナジーデバイス株式会社
Priority to CN201680044818.0A priority Critical patent/CN107851742A/zh
Priority to JP2017539856A priority patent/JPWO2017047473A1/ja
Publication of WO2017047473A1 publication Critical patent/WO2017047473A1/fr

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    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • 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
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • 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
    • 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
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • 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 battery such as a lithium ion secondary battery having a structure in which an electrode laminate in which a plurality of positive electrode main body portions and a plurality of negative electrode main body portions are laminated via a separator is accommodated in a film exterior material.
  • Lithium-ion secondary batteries have been widely used as power storage devices used as power sources for portable small devices such as mobile phones and digital cameras.
  • power sources for mobile means such as electric bikes and electric bicycles, as well as residential and commercial facilities Demand is expanding even for large-sized, large-capacity, and large-current power supplies.
  • lithium ion secondary batteries using a flexible laminate film as an exterior material are attracting attention because they are lightweight, safe and suitable for high-density mounting.
  • a battery module in which a plurality of lithium ion secondary batteries using such a flexible laminate film as an exterior material is used as an assembled battery is housed in a module case made of resin, metal, or a combination thereof, for example. Used.
  • the battery constituting the battery module continues to receive a relatively large vibration.
  • a battery having a configuration in which an electrode laminate composed of a plurality of electrodes and a separator sandwiched between electrodes is sealed with a film sheathing material when the electrode laminate moves within the film sheathing material due to impact or the like, It is desirable to suppress the movement of the electrode laminate inside the package made of the film exterior material because there is a possibility that a problem occurs as a battery.
  • Patent Document 1 Japanese Patent Laid-Open No. 2013-73913 alternately includes a plurality of electrodes and a plurality of separators.
  • a laminated electrode laminate, and an exterior body film that constitutes a package that encloses the electrode laminate by overlapping and joining peripheral portions thereof, and the plurality of separators are planar.
  • a battery bonded to the outer package film has been proposed.
  • gas species may be generated due to electrolysis of the electrolyte solvent, and the internal pressure of the battery may increase. Furthermore, even if the battery is used at a high temperature outside the standard range, a substance that is a source of gas species is generated due to decomposition of the electrolyte salt or the like.
  • the battery control circuit may fail for some reason and an abnormal voltage is applied, or for some reason. If the surroundings become abnormally hot, a large amount of gas may be generated in some cases.
  • Patent Document 1 has a problem because no measures are taken against the rupture of the film exterior material due to the increase in internal pressure as described above.
  • a battery according to the present invention includes an electrode laminate in which a positive electrode main body and a negative electrode main body are stacked via a separator, and the positive electrode main body.
  • a positive electrode extraction tab connected via a positive electrode terminal portion, a negative electrode extraction tab connected via the negative electrode main body portion and a negative electrode terminal portion, and a sealing region is formed around the electrode by thermal welding, whereby the electrode
  • the battery according to the present invention includes, on one side of the four sides of the rectangular film exterior material, a pressure release portion that releases pressure as the internal pressure of the accommodation space increases, and a part of the separator and the rectangular film exterior Both the separator / film exterior material welded portion welded to the material are provided, and according to such a battery according to the present invention, the movement of the electrode laminate can be restricted while suppressing the area of the battery. It is possible to improve the impact resistance and to take measures against rupture of the film exterior material accompanying the increase in internal pressure.
  • FIG. 1 is a perspective view of a battery 100 according to an embodiment of the present invention. It is the figure which looked at the battery 100 which concerns on embodiment of this invention from the direction of the arrow X of FIG. 1 (stacking direction of the electrode laminated body 60). It is a figure which shows the positive electrode 20 of the battery 100 which concerns on embodiment of this invention. It is a figure which shows the negative electrode 30 of the battery 100 which concerns on embodiment of this invention. It is a figure which shows the separator 40 of the battery 100 which concerns on embodiment of this invention. It is a figure which shows the separator 40 of the battery 100 which concerns on embodiment of this invention.
  • FIG. 6 is a diagram illustrating a stacking order of components in an electrode stack 60.
  • FIG. 6 is a diagram illustrating a stacking order of components in an electrode stack 60.
  • FIG. 2B is a cross-sectional view of FIG. 2A-A ′. It is a perspective view explaining the peeling stress which acts when the boundary of the heat welding part of the laminate film exterior material 80 is a shape without an unevenness
  • FIG. It is a top view which shows progress of peeling in the protrusion welding part 85.
  • FIG. It is a figure which shows the separator 40 used with the battery 100 which concerns on other embodiment of this invention. It is a figure explaining the lamination
  • FIG. 16 is a diagram illustrating a separator 40 of the battery 100 illustrated in FIG. 15.
  • FIG. 1 is a perspective view of a battery 100 according to an embodiment of the present invention.
  • the configuration accommodated in the laminate film exterior member 80 is indicated by a dotted line.
  • FIG. 2 is a view of the battery 100 according to the embodiment of the present invention as seen from the direction of the arrow X in FIG. 1 (stacking direction of the electrode stack 60).
  • the plan view of the battery 100 is defined as shown in FIG. 2, and when the battery 100 is viewed in FIG. 2, the battery main body 110 except for the areas of the positive electrode extraction tab 120 and the negative electrode extraction tab 130 is shown.
  • the area is defined as the area of the battery 100.
  • the battery main body 110 When the battery 100 is viewed in FIG. 2, the battery main body 110 includes a first side 111, a second side 112 that faces the first side 111, a third side 113, and a fourth side that faces the third side 113. Side 114.
  • the positive electrode extraction tab 120 and the negative electrode extraction tab 130 are arranged to be extracted from the first side 111.
  • the ultrasonic welding portion 93 that fixes the electrode laminate 60 to the laminate film exterior member 80 and the pressure release portion 90 that releases the gas when the internal pressure of the battery body portion 110 rises are on the second side 112 side. It has come to be arranged.
  • a lithium ion secondary battery that is one type of electrochemical element in which charge and discharge are performed by moving lithium ions between a negative electrode and a positive electrode will be described as an example. Can also be applied to other types of batteries.
  • a battery 100 according to an embodiment of the present invention includes an electrode laminate 60 in which a plurality of positive electrodes 20 and a plurality of negative electrodes 30 are laminated via a separator 40, and an electrolyte (not shown) having a rectangular laminate in plan view. The structure is accommodated in the film exterior member 80.
  • the electrode stack 60 is described in which a plurality of positive electrodes 20 and a plurality of negative electrodes 30 are stacked via a separator 40.
  • one positive electrode 20 and one negative electrode 30 may be laminated via a separator 40.
  • FIG. 3 is a diagram showing the positive electrode 20 of the battery 100 according to the embodiment of the present invention
  • FIG. 4 is a diagram showing the negative electrode 30 of the battery 100 according to the embodiment of the present invention.
  • the positive electrode 20 has a rectangular positive electrode main body portion 22 and a strip-shaped positive electrode terminal portion 24 extending from the positive electrode main body portion 22.
  • a positive electrode active material 26 such as a lithium cobalt composite oxide is applied to a thin plate-like aluminum plate.
  • the negative electrode 30 has a rectangular negative electrode main body portion 32 and a strip-shaped negative electrode terminal portion 34 extending from the negative electrode main body portion 32.
  • a negative electrode active material 36 such as graphite is applied to a thin nickel plate or copper plate.
  • FIG. 5 and 6 are views showing the separator 40 of the battery 100 according to the embodiment of the present invention.
  • the separator 40 shown in FIG. 5 and the separator 40 shown in FIG. 6 have a front-back relationship, and the separator 40 of one type of shape is prepared substantially.
  • the separator 40 has a rectangular separator body 42 and a strip-shaped separator extension piece 44 extending from the separator body 42.
  • the heel separator 40 is a sheet-like member that can be impregnated with an electrolytic solution, such as a microporous film, a nonwoven fabric, or a woven fabric, made of a thermoplastic resin such as polyolefin.
  • FIG. 7 is a diagram illustrating the stacking order of the components in the electrode stack 60.
  • the positive electrode 20, the negative electrode 30, and the separator 40 are laminated according to the rule of the separator 40, the negative electrode 30, the separator 40, the positive electrode 20, the separator 40,.
  • the positive electrode 20 is laminated so that all the positive electrode terminal portions 24 overlap one side when viewed from the lamination direction.
  • the negative electrode 30 is laminated such that all the negative electrode terminal portions 34 overlap the other side when viewed from the lamination direction.
  • the separator 40 has the separator extending pieces 44 alternately arranged in one side, the other side, one side, the other side, and so on when viewed from the stacking direction. Laminated to be arranged.
  • the separator extension piece 44 is ultrasonically welded to the laminate film exterior member 80 at two locations as viewed from the stacking direction.
  • the electrode laminate 60 accommodated in the laminate film exterior material 80 is moved due to impact or the like, there is a possibility that a defect may occur as the battery 100. Therefore, the electrode laminate 60 within the package made of the laminate film exterior material 80. It is desirable to suppress the movement of
  • the separator extension pieces 44 of the separator 40 are the two ultrasonic welding portions 93 on the second side 112 side of the laminate film exterior material 80, and the laminate film. It is configured to be fixed to the exterior material 80.
  • FIG. 8 is a cross-sectional view of FIG. 2A-A ′. As shown in FIG. 8, movement of the electrode laminate 60 is restricted by fixing the electrode laminate 60 to the laminate film exterior material 80 via the separator extension piece 44.
  • the positive electrode extraction tab 120 and the negative electrode extraction tab 130 are fixed to the laminate film exterior material 80 by welding. .
  • the positive electrode extraction tab 120 and the negative electrode extraction tab 130 are fixed to the laminate film exterior material 80 on the first side 111 side of the battery main body 110, thereby stacking the electrodes. While restricting the movement of the body 60 and also on the second side 112 side facing the first side 111, the separator extension piece 44 is fixed to the laminate film exterior member 80 at two locations, so that the electrode laminate 60. Regulate the movement of
  • the electrode laminate 60 accommodated in the laminate film exterior member 80 is fixed to the laminate film exterior member 80 at two opposing sides and the movement is restricted. It has a structure with excellent impact properties.
  • the separator extension piece 44 is fixed to the laminate film exterior material 80 at two locations on one side of the battery main body 110.
  • the separator extension piece 44 is It is preferable that the laminated film exterior material 80 is dispersed and fixed to a plurality of locations. This is to suppress energy for welding by suppressing the number of separator extension pieces 44 stacked in one welding portion.
  • the location where the separator extension piece 44 adheres to the laminate film exterior material 80 may be one location on one side. In short, as long as the side where the positive electrode extraction tab 120 and the negative electrode extraction tab 130 are fixed to the laminate film exterior member 80 and the side where the separator extension piece 44 is fixed to the laminate film exterior member 80 face each other. Good.
  • the part where the separator extension piece 44 is disposed is dispersed in a plurality of places as described above, and a part of the separator 40 (separator extension piece 44) and the laminate film exterior material 80 are dispersed. It is a desirable embodiment to disperse the separator / film exterior material welded portion (ultrasonic welded portion 93) that welds a plurality of locations.
  • the positive terminal portions 24 of the plurality of positive electrodes 20 are conductively connected to the positive electrode extraction tab 120. Further, the negative terminal portions 34 of the plurality of negative electrodes 30 are conductively connected to the negative electrode extraction tab 130.
  • An aluminum plate is used for the positive electrode extraction tab 120, and a nickel plate or a copper plate is used for the negative electrode extraction tab 130.
  • the negative electrode lead tab 130 is formed of a copper plate, the surface may be plated with nickel.
  • one positive electrode terminal part 24 may be conductively connected to the positive electrode extraction tab 120.
  • one negative terminal portion 34 may be conductively connected to the negative electrode lead tab 130.
  • the laminate film exterior material 80 is composed of two laminate films surrounding and sandwiching the electrode laminate 60 from both sides in the lamination direction, and heat-welding the opposing surfaces that overlap each other around the electrode laminate 60, The body 60 is sealed together with the electrolytic solution.
  • the hatched portion indicates a heat welding portion 81 (sealing region) that seals the electrode laminate 60 and the electrolytic solution when the laminate film exterior member 80 is heat welded.
  • the laminate film constituting the laminate film exterior material 80 is generally used for this type of film exterior battery as long as it has flexibility and can seal the battery element 2 so that the electrolyte does not leak. Can be used.
  • a structure in which a metal thin film layer and a heat-weldable resin layer are laminated, or a surface of the metal thin film layer opposite to the heat-welded resin layer is provided. Furthermore, the structure which laminated
  • the electrode laminate 60 and the electrolytic solution the electrode laminate 60 is surrounded by facing the heat-welding resin layer.
  • the metal thin film layer for example, a foil of Al, Ti, Ti alloy, Fe, stainless steel, Mg alloy or the like having a thickness of 10 ⁇ m to 100 ⁇ m can be used.
  • the resin used for the heat-welding resin layer is not particularly limited as long as it can be heat-welded.
  • polypropylene, polyethylene, acid-modified products thereof, polyphenylene sulfide, polyester such as polyethylene terephthalate, polyamide, An ethylene-vinyl acetate copolymer can be used.
  • the thickness of the heat-welding resin layer is preferably 10 ⁇ m to 200 ⁇ m, more preferably 30 ⁇ m to 100 ⁇ m.
  • the pressure release part 90 is also characterized by being provided on the second side 112 side of the battery main body part 110.
  • two non-welded portions 87 which are portions where the laminate film exterior materials 80 are not thermally welded, are accommodated in the accommodating portion 82 (battery element accommodating portion). ) And is provided in a cove shape with respect to the accommodating portion 82.
  • the two non-welded portions 87 are spaced apart from each other in the direction along the peripheral edge of the heat-welded portion (sealing region) 81, and the region between the two non-welded portions 87 is two non-welded portions.
  • a protruding welded portion 85 that protrudes from the heat welded portion (sealing region) 81 outside the portion 87 toward the accommodating portion 82 is formed.
  • a through-hole 88 that penetrates the laminate film exterior material 80 is formed in the protruding welded portion 85.
  • the laminate film exterior material when a voltage outside the standard range is applied during use or when gas is generated from the electrode laminate 60 or the like due to a temporary high temperature, the laminate film exterior material The internal pressure of 80 increases.
  • the laminate film exterior material 80 tends to swell in a dome shape, and a peeling stress acts on the portion where the laminate film exterior materials 80 are thermally welded together. At this time, the peeling stress acts intensively on the protruding welded portion 85 between the two non-welded portions 87, and the peeling of the heat-welded portion of the exterior film 5 proceeds preferentially at the protruding welded portion 85. . As the internal pressure increases, the separation reaches the position of the through hole 88, so that the battery element housing portion communicates with the outside of the laminate film exterior member 80, and the increased pressure is released through the through hole 88.
  • the gas can be ejected from a specific position before the laminate film exterior material 80 of the battery 100 is ruptured, and the burst of the laminate film exterior material 80 of the battery 100 and the ejection of gas in an unintended direction can be prevented. Can do.
  • the peeling stress F1 acts only in one direction as shown in FIG. Then, the peeling proceeds toward the outer edge of the laminate film exterior material 80.
  • the non-fused portion 87 is also filled with gas as shown in FIG. Therefore, in addition to the peeling stress F1 acting on the tip of the protruding welded portion 85, the peeling stress F2 also acts on the side edge.
  • a peeling stress larger than the other part acts as a resultant force on the corner portion of the protruding welded portion 85, and the laminate film exterior material 80 is peeled preferentially over the other portion at the corner portion.
  • the laminate film exterior material 80 is peeled off at the corner, the corner is rounded, but the protruding weld 85 still maintains a convex shape, and the protruding weld 85 is peeled from a plurality of directions. Act. Accordingly, the laminate film exterior material 80 is peeled off while the protrusion film weld material 85 is peeled off at the projecting weld portion 85 until the projecting weld portion 85 is substantially eliminated while reducing the sharpness of the convex shape. Progresses preferentially over site.
  • FIG. 11 shows the progress of peeling of the laminate film exterior material 80 at the heel protrusion weld portion 85.
  • peeling proceeds from both sides of the protruding weld portion 85 as a ⁇ b ⁇ c as the internal pressure increases.
  • the peeling position of the laminate film exterior material 80 depends on the material of the laminate film exterior material 80, the width W of the protruding weld portion 85, the protruding length L of the protruding weld portion 85, and the internal pressure.
  • the position of the through hole 88 can be adjusted to adjust the battery element storage portion.
  • the release pressure which is the internal pressure of the battery element storage portion when the inside and the outside of the battery communicate with each other, can be arbitrarily set. That is, if the through hole 88 is provided at a position close to the tip of the protruding weld portion 85, the pressure can be released with a low internal pressure, and if the through hole 88 is provided near the base of the protruding weld portion 85, the pressure can be increased to a high internal pressure. Does not open.
  • a preferable design opening pressure is 0.05 MPa to 1 MPa, more preferably 0.1 MPa to 0.4 MPa as an increase from the atmospheric pressure. If the opening pressure is too low, even a slight trouble such as when a large current flows temporarily or when the temperature becomes temporarily high will cause the battery 100 to become inoperable. On the other hand, when the release pressure is too high, the welded portion of the laminate film sheathing material 80 and the welded sealing portion of the drawer tab are opened at other portions before the peeling of the laminate film sheathing material 80 to the through hole 88 proceeds. There is an increased risk that the gas will be ejected in the direction not to go.
  • the pressure is released to one side (second side 112) of the four sides of the rectangular laminate film exterior member 80 as the internal pressure of the accommodation space of the electrode laminate 60 increases.
  • a separator / film exterior material welded portion (ultrasonic welded portion 93) in which a part of the separator 40 (separator extension piece 44) and the laminate film exterior material 80 are welded are provided.
  • the separator / film which is a point for welding the separator extension piece 44 of the separator 40 and the laminate film exterior material 80 on the second side 112 of the rectangular laminate film exterior material 80.
  • the exterior material welded portion has a structure arranged at two positions on both sides of the pressure release portion 90, and the movement of the electrode laminate 60 can be effectively restricted.
  • This embodiment is different from the previous embodiment in the configuration of the electrode laminate 60, thereby suppressing energy when welding the separator extension piece 44 and the laminate film exterior member 80.
  • the present embodiment will be described focusing on differences from the previous embodiment.
  • the number of places where the separator extension pieces 44 are arranged is two when viewed from the stacking direction.
  • the separators 40 are alternately extended in the stacking order of the separators 40.
  • the separator 40 having only the rectangular separator main body 42, which does not have the strip-shaped separator extension piece 44, is also used, so that the laminate film is formed at one welding portion.
  • the number of separator extension pieces 44 fixed to the exterior member 80 is further reduced.
  • FIG. 13 is a diagram illustrating the stacking order of the components in the electrode stack 60 of the battery 100 according to another embodiment of the present invention.
  • 40, negative electrode 30, separator 40 not having separator extension piece 44, positive electrode 20, separator 40 having separator extension piece 44,..., Positive electrode 20, negative electrode 30, and separator 40 are laminated. . That is, when the electrode laminate 60 is configured, by laminating the components, the separator 40 that does not have the separator extension piece 44 is also appropriately laminated, so that the separator extension piece 44 of the separator 40 and the laminate film exterior material are laminated.
  • the number of separator extension pieces 44 in the separator / film exterior material welding portion, which is a point for welding 80, is reduced.
  • the ultrasonic welded portion 93 can be configured using ultrasonic welding also in this embodiment. At this time, the number of separator extension pieces 44 at the point where ultrasonic welding is performed is smaller than that in the previous embodiment, so that energy during welding can be suppressed.
  • the separator 40 that does not have the separator extension piece 44 is interposed in the separator 40 that has the separator extension piece 44 to form the electrode laminate 60. 60, the coefficient of friction between the electrode laminate 60 and the laminate film exterior member 80, and the like.
  • the separator / film exterior material welded portion which is the point at which the separator extension piece 44 of the separator 40 and the laminate film exterior material 80 are welded, is used as the second side 112 of the rectangular laminate film exterior material 80.
  • the number of separator extension pieces 44 to be fixed at the separator / film exterior material welded portion is reduced by using the two locations.
  • the separator / film exterior material welded portion is fixed at the separator / film exterior material welded portion at four locations on the second side 112 of the rectangular laminate film exterior material 80.
  • the number of separator extending pieces 44 is further reduced.
  • FIG. 14 is a view showing a separator 40 used in a battery 100 according to another embodiment of the present invention.
  • FIG. 14A shows the first pattern separator 40
  • the dotted separator extension piece 44 shows the separator extension piece 44 of the separator 40 in a front-back relationship with the solid line separator 40.
  • separator 40 having a pattern as shown in FIG. 14, four points on the second side 112 of the laminate film exterior material 80 can be provided as the separator / film exterior material welded portions. It becomes possible to further reduce the number of separator extending pieces 44 fixed at the material welding portion.
  • ultrasonic welding is used when forming the separator / film exterior material welded portion by welding the separator extension piece 44 and the laminate film exterior material 80.
  • thermal welding since the number of separator extension pieces 44 fixed at one separator / film exterior material welded portion can be further reduced, it is also possible to use thermal welding that performs welding with lower energy than ultrasonic welding. It becomes.
  • FIG. 15 is a perspective view of the battery 100 according to the embodiment of the present invention used for numerical examination of the performance and number of separator extension pieces 44. In FIG. 15, the pressure release unit 90 is not shown.
  • separator / film exterior material welded portions are provided on one side of the battery main body 110 .
  • the separator / film exterior material welded portion (ultrasonic welded portion 93) is provided as an example, but the concept in the following explanation is that a plurality of separator / film exteriors are provided on one side of the battery main body 110.
  • the present invention can also be applied to the battery 100 provided with the material welding portion.
  • FIG. 16 is a diagram showing the separator 40 of the battery 100 shown in FIG.
  • the separator extending pieces 44 that can be overlapped with each other are provided so as to extend from the separator main body 42 even when the front and back sides are related.
  • the tensile strength of the separator extension piece 44 is F
  • the cross-sectional area of the separator extension piece 44 is S
  • the separator extension fixed at the separator / film exterior material welded portion is F
  • the number of pieces 44 is N and the mass of the battery is W
  • 150W ⁇ F ⁇ S ⁇ N It is preferable to have the following relationship. This is because, if this relationship can be satisfied, the impact resistance of the battery loaded on the aircraft can be satisfied.
  • the mass of the battery 100 is 800 g.
  • the thickness of the separator extension piece 44 in the stacking direction is 0.025 mm.
  • Tensile strength of separator extension piece 44 400 [kgf / cm 2 ]
  • Cross-sectional area of the separator extension piece 44; 86 [mm] ⁇ 0.025 [mm] 0.0215 [cm 2 ]
  • the total number of separator extension pieces 44 of the battery 100 is 34 sheets.
  • N 34
  • desired impact resistance can be imparted to the battery 100 by designing the battery 100 to have a relationship of 150 W ⁇ F ⁇ S ⁇ N. It becomes possible.
  • the battery according to the present invention includes a pressure release portion that releases pressure in accordance with an increase in internal pressure of the housing space, and a rectangular shape with a part of the separator, on one side of the four sides of the rectangular film exterior material.
  • Both the separator / film exterior material welded portion welded to the film exterior material are provided, and according to the battery according to the present invention, the movement of the electrode laminate is restricted while suppressing the area of the battery.
  • the present invention relates to a battery using a flexible laminate film that is lightweight, high in safety, and high in energy density as an exterior material.
  • a battery having a structure in which an electrode laminate is sealed with a film sheathing material if the electrode laminate moves within the film sheathing material due to an impact or the like, a defect may occur as a battery. It is desirable to suppress the movement of the electrode stack inside.
  • gas when gas is generated inside the battery, it is desirable to provide a configuration for preventing a situation in which the internal pressure of the battery is increased by the gas, the film exterior material is ruptured, and the gas is ejected.
  • one of the four sides of the rectangular film exterior material has a rectangular shape and a pressure release portion that releases pressure as the internal pressure of the housing space increases, and a part of the separator has a rectangular shape.
  • Both the separator / film exterior material welded portion welded to the film exterior material are provided, and according to the battery according to the present invention, the movement of the electrode laminate is restricted while suppressing the area of the battery. It is possible to improve the impact resistance, and it is possible to take measures against the rupture of the film outer packaging material accompanying the increase in internal pressure, and the industrial utility is very large.

Landscapes

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

Abstract

L'invention porte sur une batterie (100) qui comprend : un corps stratifié à électrodes dans lequel des parties corps principal d'électrode positive (22) et des parties corps principal d'électrode négative (32) sont disposées en couches avec des séparateurs intercalés entre elles ; une languette de sortie d'électrode positive (120) connectée par l'intermédiaire d'une partie borne d'électrode positive (24) à la partie corps principal d'électrode positive (22) ; une languette de sortie d'électrode négative (130) connectée par l'intermédiaire d'une partie borne d'électrode négative (34) à la partie corps principal d'électrode négative (32) ; et un matériau extérieur en film stratifié rectangulaire (80), comportant une région scellée formée dans sa périphérie par thermoscellage, moyennant quoi un espace de logement est formé pour loger le corps stratifié à électrodes et une solution électrolytique. Au niveau d'un bord parmi les quatre bords du matériau extérieur en film stratifié rectangulaire (80), sont disposées à la fois : une partie de détente de pression (90) pour détendre la pression lorsque la pression interne de l'espace de logement s'élève ; et une partie soudée séparateur/matériau extérieur en film (93) résultant du soudage d'une partie du séparateur et du matériau extérieur stratifié en film rectangulaire.
PCT/JP2016/076344 2015-09-15 2016-09-07 Batterie WO2017047473A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201680044818.0A CN107851742A (zh) 2015-09-15 2016-09-07 电池
JP2017539856A JPWO2017047473A1 (ja) 2015-09-15 2016-09-07 電池

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015181970 2015-09-15
JP2015-181970 2015-09-15

Publications (1)

Publication Number Publication Date
WO2017047473A1 true WO2017047473A1 (fr) 2017-03-23

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JP (1) JPWO2017047473A1 (fr)
CN (1) CN107851742A (fr)
WO (1) WO2017047473A1 (fr)

Cited By (3)

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Publication number Priority date Publication date Assignee Title
JP2020053177A (ja) * 2018-09-25 2020-04-02 大日本印刷株式会社 蓄電デバイス
WO2022044602A1 (fr) * 2020-08-24 2022-03-03 株式会社村田製作所 Batterie secondaire et procédé de fabrication d'une batterie secondaire
WO2022197039A1 (fr) * 2021-03-15 2022-09-22 삼성전자 주식회사 Batterie ayant une structure de renforcement et dispositif électronique la comprenant

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DE102016225252A1 (de) * 2016-12-16 2018-06-21 Robert Bosch Gmbh Elektrischer Energiespeicher, insbesondere Batteriezelle, mit Bauraum-optimierter Elektrodenverschaltung

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JP2008091269A (ja) * 2006-10-04 2008-04-17 Nissan Motor Co Ltd 薄型電池
JP2009231153A (ja) * 2008-03-25 2009-10-08 Nec Tokin Corp フィルム外装電気化学デバイス
JP2013041786A (ja) * 2011-08-19 2013-02-28 Nec Energy Devices Ltd 電池
JP2013073913A (ja) * 2011-09-29 2013-04-22 Automotive Energy Supply Corp 電池とその製造方法

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JP2005203262A (ja) * 2004-01-16 2005-07-28 Nec Lamilion Energy Ltd フィルム外装電気デバイス
JP2008091269A (ja) * 2006-10-04 2008-04-17 Nissan Motor Co Ltd 薄型電池
JP2009231153A (ja) * 2008-03-25 2009-10-08 Nec Tokin Corp フィルム外装電気化学デバイス
JP2013041786A (ja) * 2011-08-19 2013-02-28 Nec Energy Devices Ltd 電池
JP2013073913A (ja) * 2011-09-29 2013-04-22 Automotive Energy Supply Corp 電池とその製造方法

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020053177A (ja) * 2018-09-25 2020-04-02 大日本印刷株式会社 蓄電デバイス
JP7187927B2 (ja) 2018-09-25 2022-12-13 大日本印刷株式会社 蓄電デバイス
WO2022044602A1 (fr) * 2020-08-24 2022-03-03 株式会社村田製作所 Batterie secondaire et procédé de fabrication d'une batterie secondaire
JP7351420B2 (ja) 2020-08-24 2023-09-27 株式会社村田製作所 二次電池および二次電池の製造方法
WO2022197039A1 (fr) * 2021-03-15 2022-09-22 삼성전자 주식회사 Batterie ayant une structure de renforcement et dispositif électronique la comprenant

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JPWO2017047473A1 (ja) 2018-08-02

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