WO2023149212A1 - Batterie secondaire - Google Patents

Batterie secondaire Download PDF

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Publication number
WO2023149212A1
WO2023149212A1 PCT/JP2023/001427 JP2023001427W WO2023149212A1 WO 2023149212 A1 WO2023149212 A1 WO 2023149212A1 JP 2023001427 W JP2023001427 W JP 2023001427W WO 2023149212 A1 WO2023149212 A1 WO 2023149212A1
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WO
WIPO (PCT)
Prior art keywords
foam sheet
secondary battery
resin
sheet
battery
Prior art date
Application number
PCT/JP2023/001427
Other languages
English (en)
Japanese (ja)
Inventor
健一 藤崎
恭一 豊村
輝一 浅野
Original Assignee
Dic株式会社
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Filing date
Publication date
Application filed by Dic株式会社 filed Critical Dic株式会社
Priority to JP2023578460A priority Critical patent/JPWO2023149212A1/ja
Publication of WO2023149212A1 publication Critical patent/WO2023149212A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/651—Means for temperature control structurally associated with the cells characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/659—Means for temperature control structurally associated with the cells by heat storage or buffering, e.g. heat capacity or liquid-solid phase changes or transition
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H01M50/291—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H01M50/293—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by the material
    • 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

Definitions

  • the present invention relates to secondary batteries.
  • lithium ion secondary batteries for example, are also used as onboard power sources for electric vehicles or hybrid vehicles, and various performance improvements have been made.
  • the capacity of secondary batteries has increased, and each component of a lithium-ion secondary battery, such as positive electrode material, negative electrode material, separator, and electrolyte, is housed and sealed in multiple battery cells to form a unit.
  • a secondary battery (secondary battery module) is disclosed which is made into and connected in series or in parallel using a bus spar (see, for example, Patent Document 1).
  • the battery cells In order to suppress the expansion or contraction of the battery cells, for example, it has a frame-shaped frame that constrains the battery cell units in the stacking direction, and separator frames at the ends arranged at both ends of the battery cell units in the stacking direction.
  • a secondary battery in which a gap is provided between each corner provided in the opposite direction and between each corner of the separator at the end and each corner of the frame facing each other (see Patent Document 2); battery cell A specific cell stack structure including a plate member, an elastic member, and a connecting member capable of creep deformation at one end in the stacking direction of a plurality of stacked cells (see Patent Document 3) has been proposed.
  • Patent Document 2 still has room for improvement in the ease of assembly of the secondary battery, depending on the rigidity of the frame. is required, and there are still problems such as manufacturing costs.
  • the structure of Patent Document 2 still has room for improvement in the ease of assembly of the secondary battery, depending on the rigidity of the frame. is required, and there are still problems such as manufacturing costs.
  • the temperature of the secondary battery rises due to the heat generated during high-speed charging or high-power discharging, it will cause deterioration of the secondary battery, as well as rapid temperature rise and thermal runaway. There is a risk of fire or damage to the battery due to Therefore, there is a demand for development of a method for improving the safety of secondary batteries and suppressing their deterioration.
  • the present invention relates to the following (1) to (6).
  • a secondary battery having a structure capable of absorbing expansion and contraction due to deterioration over time of battery cells constituting the secondary battery. Further, according to the present invention, there is provided a secondary battery having a structure capable of absorbing expansion and contraction due to deterioration of battery cells over time, and preventing deterioration of the secondary battery due to heat generation and ignition and damage due to thermal runaway. can.
  • FIG. 1 is a perspective view showing a first embodiment of a secondary battery of the invention
  • FIG. FIG. 2 is a partially cutaway perspective view of a secondary battery according to a second embodiment of the present invention
  • 1 is a schematic cross-sectional view of an example of a foam sheet included in a secondary battery of the invention
  • FIG. 1 is a schematic cross-sectional view of an example of a foam sheet included in a secondary battery of the invention
  • FIG. It is a stress-compression strain curve of sheets 1 to 6 obtained in Examples 1 to 6.
  • the secondary battery of the present invention comprises two or more battery cells, a case for housing the battery cells, a foam sheet arranged on the inner surface of the case, and foam arranged so as to separate the adjacent battery cells. have either or both of the sheets.
  • the foam sheet is arranged so as to separate adjacent battery cells, the foam sheet is preferably sandwiched between the battery cells.
  • the type of secondary battery is not particularly limited, and examples include lithium ion batteries, lithium ion polymer batteries, lead storage batteries, nickel/hydrogen storage batteries, nickel/cadmium storage batteries, nickel/iron storage batteries, nickel/zinc storage batteries, and silver oxide/zinc storage batteries. , metal-air batteries, polyvalent cation batteries, condensers, capacitors, and the like. Among them, lithium-ion batteries can be mentioned as suitable applications.
  • FIG. 1 is a perspective view showing a first embodiment of the secondary battery of the present invention.
  • a secondary battery 100 shown in FIG. 1 is, for example, a secondary battery that is mounted on a vehicle or the like, and has a plurality of battery cells 1 and a case 10 that houses the battery cells 1 .
  • a battery cell 1 constituting a secondary battery uses, for example, a battery exterior film as an exterior material, and a battery element including at least a positive electrode material, a negative electrode material, a separator, a positive electrode terminal, a negative electrode terminal, etc. is enclosed in the exterior material. can be any battery cell.
  • the exterior material is formed, for example, by heat-sealing the sealant layers of the exterior film for a battery, and has a flange portion (region where the sealant layers are in close contact with each other by heat-sealing) on the periphery.
  • a secondary battery 100 of the present embodiment is configured by housing a plurality of such battery cells 1 in a case 10 .
  • the case can be formed of, for example, aluminum, iron, or a metal material containing these, or a resin material such as polyphenylene sulfide. Forming the case from a resin material contributes to the weight reduction of the secondary battery and improves adhesion with the foam sheet. can also be increased.
  • the case 10 is a box-shaped member having a bottom and peripheral walls, and is fitted with a lid (not shown) so as to close the opening.
  • the cover has, in a state of being attached to the case 10, an external connection positive electrode terminal collectively connected to the plurality of positive electrode tabs 29 and an external connection negative electrode terminal collectively connected to the plurality of negative electrode tabs 39. is provided.
  • a foam sheet 20 is arranged on the inner surface of the case 10, and a foam sheet 30 is preferably arranged so as to be sandwiched between the battery cells so as to separate the adjacent battery cells.
  • the foam sheet is preferably arranged both on the inner surface of the case and between the battery cells.
  • a non-foam sheet may be used as a sheet having a wide range of effective strain due to stress and a large compressibility calculated from a stress-compressive strain curve obtained in a compression test. can.
  • a foamed sheet is extremely preferable as a form that exhibits such cushioning properties.
  • the foam sheet When the foam sheet is sandwiched between the battery cells, it can suppress the effect of temperature between the battery cells due to its heat insulating properties. can be absorbed, and the increase in internal pressure of the secondary battery can be easily alleviated.
  • the foam sheet may be sandwiched between all the two or more battery cells, or may be sandwiched between some of the battery cells.
  • the foamed sheet constituting the secondary battery of the present invention may be a sheet made of a resin foam, or may be a single-layer sheet further containing a resin as a matrix and a heat-absorbing agent and a heat-storage material, which will be described later. Moreover, it may be a laminate further comprising an adhesive layer, a flame-shielding layer, or any other layer, which will be described later, on the foam sheet layer.
  • a single-layer sheet consisting only of a resin-containing layer will be referred to as a "foamed sheet”.
  • the foam sheet When arranging the foam sheet on the inner surface of the case that houses the battery cells or when arranging it so as to separate adjacent battery cells, for example, adhesives, fusion (ultrasonic fusion, high frequency fusion, heat fusion bonding), an adhesive, or the like can be used.
  • adhesives for example, adhesives, fusion (ultrasonic fusion, high frequency fusion, heat fusion bonding), an adhesive, or the like can be used.
  • the foam sheet is a laminate having an adhesive layer on both sides of the outermost layer, it is possible to omit the additional use of an adhesive or a pressure-sensitive adhesive, particularly when sandwiching the foam sheet between battery cells, and from the viewpoint of workability.
  • Advantageous Since the battery cells are fixed by the adhesive layer, it is possible to prevent the battery cells from shifting.
  • the foam sheet is a foam sheet further having a flame-shielding layer, or a foam sheet containing one or more of a heat-absorbing agent or a heat-storage material described later, or having a flame-shielding layer and a heat-absorbing agent or
  • a foam sheet containing one or more heat storage materials can absorb expansion and contraction due to deterioration of battery cells over time, and can prevent secondary battery deterioration due to heat generation and ignition and damage due to thermal runaway. . In other words, it suppresses the heat generated during high-speed charging and high-power discharge, and the rapid temperature rise of the secondary battery due to internal short circuits, etc., and minimizes the secondary battery deterioration due to heat generation and the ignition and damage due to thermal runaway. It is possible to provide a secondary battery having a structure capable of preventing or delaying successive explosions in other battery cells by limiting the amount of heat generated to the abnormally high temperature battery cells and extinguishing the heat.
  • thermoplastic resins include thermoplastic resins, thermosetting resins and elastomer resins.
  • thermoplastic resins include polyolefin resins such as polypropylene resin, polyethylene resin, poly(1-butene) resin, polyisobutylene resin and polypentene resin; polyester resins such as polyethylene terephthalate; polystyrene resins and acrylonitrile-butadiene-styrene (ABS).
  • thermosetting resins include synthetic resins such as epoxy resins, urethane resins, phenol resins, urea resins, melamine resins, unsaturated polyester resins, and polyimides.
  • Elastomer resins include acrylonitrile-butadiene rubber, ethylene-propylene-diene rubber (EPDM), ethylene-propylene rubber, natural rubber, polybutadiene rubber, polyisoprene rubber, polystyrene-polybutadiene diblock copolymer or hydrogenated products thereof, polystyrene- Polybutadiene-polystyrene triblock copolymer or hydrogenated products thereof, polystyrene-polyisoprene diblock copolymer or hydrogenated products thereof, polystyrene-polyisoprene-polystyrene triblock copolymers or hydrogenated products thereof, and the like.
  • thermoplastic resin is preferable among the above.
  • the foam sheet when the foam sheet further contains a heat-absorbing agent and a heat storage material, which will be described later, it is easy to form a structure having voids, and from the viewpoint that it is easy to secure the porosity, the voids are formed by mechanical foaming as the resin.
  • Emulsion resins are preferred.
  • emulsion resins include acrylic emulsion resins, urethane emulsion resins, ethylene-vinyl acetate emulsion resins, vinyl chloride emulsion resins, and epoxy emulsion resins. Among them, acrylic emulsion resins are preferable because they are excellent in heat resistance and heat insulation.
  • acrylic resins include resins obtained by polymerizing monomer components containing (meth)acrylic acid alkyl esters.
  • (meth)acryl is a generic term for acryl, methacryl, and both of them.
  • (Meth)acrylate is a generic term for acrylate, methacrylate and both.
  • (meth)acrylic acid alkyl esters include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, and isobutyl (meth)acrylate.
  • t-butyl (meth)acrylate pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, nonyl (meth)acrylate, decyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate and the like. These may be used individually by 1 type, or may use 2 or more types together.
  • a polar group-containing monomer may be included in addition to the (meth)acrylic acid alkyl ester described above.
  • polar group-containing monomers include carboxylic acids having an ethylenically unsaturated group such as (meth)acrylic acid and itaconic acid; 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (Meth)acrylates having hydroxyl groups such as (meth)acrylates, caprolactone-modified (meth)acrylates, polyoxyethylene (meth)acrylates, polyoxypropylene (meth)acrylates; (meth)acrylonitrile, N-vinylpyrrolidone, N-vinyl Caprolactam, N-vinyllauryllactam, (meth)acryloylmorpholine, (meth)acrylamide, dimethyl (meth)acrylamide, N-methylol (meth)acryl
  • the acrylic resin polymethyl (meth)acrylate and polyethyl (meth)acrylate are preferred, polymethyl (meth)acrylate is more preferred, and polymethyl methacrylate (PMMA) is even more preferred.
  • the weight-average molecular weight of the acrylic resin is preferably 1,000 to 100,000, more preferably 5,000 to 90,000, from the viewpoints of easily improving the mechanical strength of the foam sheet and facilitating the dispersion of heat-absorbing agents, heat storage materials, etc. in the foam sheet. 20,000 to 80,000 are more preferred.
  • the weight average molecular weight is the weight average molecular weight in terms of standard polystyrene measured by gel permeation chromatography (GPC).
  • the average particle size of the emulsion resin is preferably 30 nm to 1,500 nm, more preferably 50 to 1,000 nm, from the viewpoint of facilitating the coating of the heat-absorbing agent and the resin-coated heat-absorbing agent. .
  • the average particle diameter of the emulsion resin is 50% median diameter measured by a dynamic light scattering method, for example, 50% by volume measured by a Microtrac UPA type particle size distribution analyzer manufactured by Nikkiso Co., Ltd. The median diameter can be taken as the average particle diameter.
  • the foam sheet may be a foamed body of the resin described above, or may have a structure in which a heat absorbing agent and a heat storage material, which will be described later, are dispersed in the resin as a matrix and have voids.
  • the specific gravity of the foamed sheet is preferably 0.15 to 1.6, more preferably 0.2 to 1.0.
  • the specific gravity of the foamed sheet constituting the secondary battery of the present invention is within the above range, the effect of temperature between battery cells can be suppressed by heat insulation, and the cushioning property acts as a cushioning material for volume changes due to expansion of the battery cells. , it is easy to alleviate the internal pressure rise of the secondary battery. Furthermore, the weight of the foamed sheet can be easily reduced, and workability is improved.
  • the endothermic agent examples include inorganic hydrates, metal hydroxides, carbonates, and the like, which preferably have an endothermic peak at a temperature of 80°C or higher.
  • the endothermic agent include inorganic hydrates, metal hydroxides, carbonates, and the like, which preferably have an endothermic peak at a temperature of 80°C or higher.
  • at least one selected from the group consisting of calcium sulfate dihydrate, sodium hydrogen carbonate, aluminum hydroxide, magnesium hydroxide and calcium carbonate is preferable, and more than calcium sulfate dihydrate, sodium hydrogen carbonate and aluminum hydroxide. At least one selected from the group consisting of is more preferable.
  • One type of endothermic agent may be used alone, or two or more types may be used in combination
  • the endothermic starting temperature of the endothermic agent is preferably in the range of 60°C to 750°C, more preferably in the range of 80°C to 450°C, even more preferably in the range of 80°C to 300°C.
  • the endothermic peak temperature of the endothermic agent is preferably in the range of 80°C to 800°C, more preferably in the range of 100°C to 500°C, even more preferably in the range of 100°C to 350°C.
  • the endothermic amount of the endothermic agent is preferably in the range of 100 J/g to 1200 J/g, more preferably in the range of 300 J/g to 1200 J/g.
  • the endothermic start temperature, endothermic peak temperature, and endothermic amount of each endothermic agent are values obtained by the method described later in Examples using a differential scanning calorimeter (DSC).
  • the foam sheet may contain one kind of endothermic agent alone, or may contain two or more kinds of endothermic agents.
  • two or more endothermic agents When two or more endothermic agents are contained, it is preferable to combine two or more endothermic agents having different endothermic start temperatures or different endothermic peak temperatures.
  • an endothermic agent endothermic agent 1 having a relatively low endothermic start temperature or endothermic peak temperature and an endothermic agent (endothermic agent 2) having a relatively high endothermic start temperature or endothermic peak temperature
  • an endothermic reaction is continuously generated, and thermal runaway can be effectively suppressed.
  • the electrolyte often burns, and the electrolyte burns when ignited or ignited.
  • the endothermic starting temperatures of the endothermic agent 1 and the endothermic agent 2 preferably differ by 50° C. or more, more preferably by 100° C. or more.
  • the endothermic peak temperatures of the endothermic agent 1 and the endothermic agent 2 preferably differ by 50°C or more, more preferably by 100°C or more.
  • the particle size of the endothermic agent is preferably in the range of 1 ⁇ m to 100 ⁇ m, more preferably in the range of 1 ⁇ m to 80 ⁇ m.
  • the particle diameter of the endothermic agent is the value of the median diameter (D50) measured with a laser diffraction/scattering particle size distribution analyzer.
  • the content thereof is 10% by mass to 95% by mass with respect to all components of the foam sheet containing the endothermic agent and the resin as the matrix, from the viewpoint of easily realizing suitable endothermic properties. It is preferably in the range of % by mass, more preferably in the range of 50% by mass to 90% by mass, and even more preferably in the range of 65% by mass to 90% by mass.
  • the content of the resin in the foam sheet is preferably in the range of 5 to 90% by mass, more preferably 10 to 50% by mass, from the viewpoint of easily adjusting the content of the voids and the heat-absorbing agent and improving the content of both. is more preferred, and a range of 10 to 35% by mass is even more preferred.
  • the amount ratio of the heat absorbing agent and the resin is preferably 80/20 to 15/85 in terms of the solid content mass ratio represented by the heat absorbing agent/resin. It is preferably 70/30 to 30/70, more preferably.
  • the foam sheet may further contain a heat storage material.
  • the endothermic agent described above is a substance that decomposes by absorbing heat.
  • the heat storage material is positioned as a substance that absorbs heat when the phase changes from solid to liquid, and releases heat when the phase changes from liquid to solid. If a heat storage material with a relatively high temperature (that is, melting point) that causes a phase change is selected, the heat generated during charging of the secondary battery can be absorbed by the heat storage material, thereby suppressing a rapid temperature rise of the secondary battery. It is possible to prevent deterioration and ignition of the secondary battery.
  • a heat storage material that causes a phase change at a relatively low temperature when the temperature of the secondary battery drops as the ambient temperature drops, the heat stored in the heat storage material is released, can prevent the temperature from dropping.
  • the melting point of the heat storage material is preferably 15° C. to 60° C., more preferably 20° C. to 50° C., from the viewpoint of suppressing a rapid temperature rise of the secondary battery and better absorbing heat generated during charging. is more preferred, and 30°C to 45°C is even more preferred.
  • the heat storage material is not particularly limited, but examples thereof include fatty acid esters and alkanes (paraffins). These compounds may be used individually by 1 type, or may use 2 or more types together.
  • fatty acid esters include methyl myristate, methyl palmitate, ethyl palmitate, methyl stearate, and ethyl stearate. Among them, preferred are methyl palmitate, ethyl palmitate, methyl stearate and ethyl stearate, and more preferred is methyl stearate.
  • alkanes examples include hexadecane, heptadecane, octadecane, nonadecane, icosane, henicosane, and docosane.
  • heptadecane, octadecane, nonadecane, icosane, henicosane and docosane are preferred, nonadecane, icosane, henicosane and docosane are more preferred, and icosane, henicosane and docosane are even more preferred.
  • Such a heat storage material is preferably in the form of coated particles coated with a shell made of an organic material such as melamine resin, acrylic resin, or urethane resin.
  • the average particle size of the coated particles is not particularly limited, but is preferably 10 ⁇ m to 3000 ⁇ m. By using coated particles having an average particle diameter within this range, voids can be easily formed between the coated particles in the foamed sheet, and good moldability can be easily realized.
  • the average particle size is more preferably 30 ⁇ m or more, still more preferably 50 ⁇ m or more, and particularly preferably 100 ⁇ m or more.
  • the average particle size is more preferably 2000 ⁇ m or less, and even more preferably 1000 ⁇ m or less.
  • the average particle diameter of the primary particles is within the above range.
  • the average particle diameter of the coated particles is measured by a laser diffraction particle size distribution analyzer (manufactured by Horiba, Ltd., "LA-950V2"), and the obtained median diameter (the particle diameter corresponding to 50% of the volume cumulative distribution : 50% particle size).
  • thermomemory FP-16, FP-25, FP-31, FP-39 (all trade names) manufactured by Mitsubishi Paper Mills, and Riken Resin PMCD-15SP manufactured by Miki Riken Kogyo Co., Ltd., as those having an outer shell made of melamine resin.
  • 25SP, 32SP all trade names
  • Riken resins LA-15, LA-25, LA-32 (all trade names) manufactured by Miki Riken Kogyo Co., Ltd., etc. as those having an outer shell made of silica
  • Polymethyl methacrylate Micronal DS5001X, 5040X both trade names) manufactured by BASF, etc. as those having an outer shell made of resin
  • NJ2721 both are trade names
  • the foam sheet may contain other additives as necessary.
  • Other additives include, for example, flame retardants, harmful substance adsorbents such as formaldehyde, deodorants, color pigments, and the like.
  • flame retardant organic flame retardants and inorganic flame retardants can be used as appropriate.
  • organic flame retardant include phosphorus compounds, halogen compounds, and guanidine compounds, and specific examples include primary ammonium phosphate, secondary ammonium phosphate, triester phosphate, phosphite, and phosphonium.
  • inorganic flame retardants include antimony and aluminum compounds, boron compounds, and ammonium compounds. ammonium sulfate, ammonium sulfamate and the like. A flame retardant may be used individually by 1 type, or may use 2 or more types together.
  • the thickness of the foamed sheet is preferably 100 ⁇ m to 20000 ⁇ m, more preferably 100 ⁇ m to 6000 ⁇ m, even more preferably 100 ⁇ m to 3000 ⁇ m, even more preferably 100 ⁇ m to 1000 ⁇ m. In this case, it is possible to further improve handling properties such as cushioning properties, mechanical strength, and workability of the foamed sheet.
  • the 25% compressive strength of the foam sheet is preferably 10 kPa or more, more preferably 10 kPa to 1000 kPa, more preferably 15 kPa to 700 kPa, and 15 kPa to 600 kPa. It is more preferable from the viewpoint of Here, the 25% compressive strength was determined according to JIS K 6767 by setting a foam sheet cut into 30 mm squares and having a thickness of about 1 mm, and compressing the foam sheet at a rate of 0.5 mm/min at 23°C to about 0.00. It refers to the value obtained by measuring the strength when compressed to 25 mm (25% of the original thickness).
  • the foam sheet should preferably have a mandrel diameter of 25 mm or less, more preferably 20 mm or less, and 16 mm or less at which cracks occur in a bending resistance test in accordance with JIS K5600-5-1 (1999). is more preferred.
  • a foam sheet that satisfies these requirements can ensure suitable flexibility and excellent conformability to the surfaces of various members.
  • the tensile strength in the machine direction and width direction of the foam sheet is preferably 100 kPa or more, more preferably 200 kPa to 18000 kPa. In this case, it is possible to obtain a tough foam sheet while having flexibility. In addition, such a foamed sheet is less likely to crack during processing, transportation, and the like, and is preferable because it can exhibit suitable workability, handleability, transportation suitability, bending suitability, and the like.
  • the tensile elongation at break in the tensile test of the foam sheet is preferably 5% to 1500% in the machine direction, more preferably 30% to 1000%, still more preferably 50% to 950%, Especially preferred is 60% to 800%.
  • the tensile elastic modulus and tensile elongation of the foamed sheet are within the above ranges, it is possible to achieve excellent flexibility while being strong, and workability and workability in assembling the secondary battery of the present invention are favorable.
  • the tensile strength in the machine direction and width direction of the foam sheet was measured according to JIS K 6251 by using a Tensilon tensile tester to test the foam sheet cut into dumbbell No. 1 at 23 ° C. and 50% RH. It is the maximum strength measured under the conditions of a tensile speed of 500 mm/min in the environment.
  • the foam sheet that constitutes the secondary battery of the present invention preferably has a wide range of effective strain due to stress and a large compressibility, which is calculated from a stress-compression strain curve obtained in a compression test of the foam sheet.
  • the average cell diameter in the machine direction and width direction of the foamed sheet is preferably in the range of 10 ⁇ m to 500 ⁇ m, more preferably in the range of 30 ⁇ m to 400 ⁇ m, even more preferably in the range of 50 ⁇ m to 300 ⁇ m.
  • the cushioning property is excellent.
  • the ratio of the average cell diameters in the machine direction and the width direction of the foamed sheet is preferably 0.2 to 4, more preferably 0.3 to 3, and further It is preferably 0.4 to 1. Within the above ratio range, variation in flexibility and tensile strength in the machine direction and width direction of the foam sheet is less likely to occur.
  • the average cell diameter in the thickness direction of the foamed sheet is preferably in the range of 3 ⁇ m to 100 ⁇ m, more preferably in the range of 5 ⁇ m to 80 ⁇ m, even more preferably in the range of 5 ⁇ m to 50 ⁇ m.
  • the average cell diameter in the thickness direction of the foam sheet is preferably 1/2 or less, more preferably 1/3 or less, of the thickness of the foam sheet.
  • the ratio of the average cell diameter in the width direction to the diameter (average cell diameter in the width direction/average cell diameter in the thickness direction) is preferably 1 or more, more preferably 3 or more, and 4. ⁇ 25 is more preferred.
  • the foam sheet has such a ratio of average cell diameters, the sheet has excellent flexibility in the thickness direction and further excellent adhesion to the case and battery cells.
  • the average cell diameter in the width direction, flow direction, and thickness direction of the foam sheet can be measured in the following manner. First, the foam sheet is cut to a size of 1 cm in the width direction and 1 cm in the machine direction. Next, a digital microscope (trade name “KH-7700”, manufactured by HiROX) is set at a magnification of 200 times to observe a cut surface of the foam sheet in the width direction or the machine direction. At that time, all the bubble diameters of the bubbles existing within a range of 1.5 mm in the flow direction or width direction of the cut surface are measured. Next, the range of 1.5 mm is changed, and all the bubble diameters of the bubbles existing in arbitrary ten ranges are measured. Let the value which calculated the average value of the bubble diameter measured above be an average bubble diameter.
  • the use of a foam sheet having a closed-cell structure is preferable from the viewpoint of effectively preventing water infiltration or dust from the cut surface of the foam sheet.
  • the shape of the cells forming such a closed cell structure is such that the average cell diameter in the flow direction, width direction, or both directions is larger than the average cell diameter in the thickness direction, so that moderate cushioning properties can be obtained. It is preferable to obtain
  • the apparent density of the foam sheet is 0.08 g/cm 3 to 0.7 g/cm 3 , since it is easy to achieve both impact resistance and adhesion by adjusting the compressive strength, average cell diameter, etc. within the above ranges.
  • 0.1 g/cm 3 to 0.65 g/cm 3 more preferably 0.2 g/cm 3 to 0.65 g/cm 3 , particularly preferably 0.3 g/cm 3 to 0.6 g/cm 3 be.
  • the apparent density is a value calculated by measuring the mass of a foam sheet cut into a rectangle of 4 cm ⁇ 5 cm in accordance with JIS K 6767 and preparing about 15 cm 3 .
  • the density, compressive strength, tensile strength, etc. of the foam sheet can be appropriately adjusted depending on the material and foam structure of the foam sheet.
  • the foam sheet provided in the secondary battery of the present invention can be produced by a method including mechanical foaming or chemical foaming.
  • the foamed sheet can be produced by mechanically foaming the emulsion resin described above, or a resin composition further containing a heat-absorbing agent, a heat-storage material, etc. in addition to the emulsion resin described above, followed by coating, casting, and drying. .
  • the resin composition may be cured by heat, ultraviolet rays, or the like, if necessary, after being dried.
  • the resin composition further containing a thermal decomposition type foaming agent and a foaming aid is supplied to an extruder and melt-kneaded to obtain a sheet.
  • a sheet is obtained by extruding into a shape, and a thermally decomposable foaming agent in the sheet is foamed.
  • the thermal decomposition type foaming agent includes azodicarbonamide, N,N'-dinitrosopentamethylenetetramine, p-toluenesulfonyl semicarbazide, etc., and may be used alone or in combination of two or more. .
  • the amount of the thermally decomposable foaming agent added is usually preferably 1 part by mass to 40 parts by mass with respect to 100 parts by mass of the resin, from the viewpoint of easily adjusting the foaming ratio, tensile strength, compression recovery rate, etc. within the desired range. , more preferably 1 to 30 parts by mass.
  • the method for foaming the thermally decomposable foaming agent in the sheet is not particularly limited, and examples thereof include a method of heating with hot air, infrared rays, a salt bath, or an oil bath.
  • the content of the heat-absorbing agent in the resin composition is such that the amount ratio of heat-absorbing agent/resin in the foam sheet is within the above range, that is, the solid content represented by heat-absorbing agent/resin
  • the weight ratio is preferably 80/20 to 15/85, more preferably 70/30 to 30/70.
  • the resin composition may optionally be mixed with a surfactant, a thickener, a flame retardant, a cross-linking agent, and the like.
  • a surfactant can be mixed in the resin composition for the purpose of miniaturizing and stabilizing foamed foam.
  • the surfactant is preferably an anionic surfactant, and more preferably a fatty acid ammonium surfactant such as ammonium stearate.
  • Surfactant may be used individually by 1 type, or may use 2 or more types together.
  • the content thereof is preferably 30 parts by mass or less relative to 100 parts by mass (solid content) of the resin, since it facilitates obtaining suitable foaming properties. 5 to 20 parts by mass is more preferable, and 3 to 15 parts by mass is even more preferable.
  • a thickening agent can be mixed in order to improve the stability and film-forming properties of the foamed foam.
  • thickeners include acrylic acid-based thickeners, urethane-based thickeners, polyvinyl alcohol-based thickeners, and the like. Among them, acrylic acid-based thickeners and urethane-based thickeners are preferred.
  • the content is preferably 0.1 to 10 parts by mass, and 0.5 to 8 parts by mass with respect to 100 parts by mass (solid content) of the resin. more preferred.
  • a curing agent may be mixed with the resin composition.
  • the curing agent can be appropriately selected according to the type of resin used, and examples thereof include epoxy curing agents, melamine curing agents, isocyanate curing agents, carbodiimide curing agents, oxazoline curing agents and the like.
  • the foam sheet may be a laminate having adhesive layers on both outermost layers, as shown in FIG. 3, for example. . That is, in the secondary battery of the present invention, a plurality of battery cells may be fixed by the adhesive layer further included in the foam sheet.
  • adhesives capable of forming an adhesive layer include those containing resins such as natural rubber, synthetic rubber, acrylic resins, silicone resins, urethane resins, and vinyl ether resins as binders.
  • the form of the pressure-sensitive adhesive may be any of solvent-based, emulsion-based, water-based, hot-melt-type, and non-solvent-based, such as active energy ray-curable type such as ultraviolet rays and electron beams.
  • the respective adhesive layers may have the same adhesive strength or different adhesive strengths.
  • one of the adhesive layers may be a so-called strong adhesive layer and the other may be a weak adhesive layer.
  • each adhesive layer may have the same composition or different compositions.
  • the adhesive strength of the adhesive layer can also be designed in consideration of disassembly of the secondary battery.
  • the pressure-sensitive adhesive that can form the pressure-sensitive adhesive layer preferably contains a solvent from the viewpoint of maintaining good coating workability. Examples of the solvent that can be used include toluene, xylene, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, and hexane.
  • the aqueous solvent which consists mainly of water or water can be used.
  • the pressure-sensitive adhesive capable of forming the pressure-sensitive adhesive layer may contain a tackifying resin, a cross-linking agent, other additives, etc., if necessary.
  • tackifying resins include rosin, polymerized rosin, polymerized rosin ester, rosin phenol, stabilized rosin ester, disproportionated rosin ester, terpene, terpene phenol fat, petroleum resin, and the like.
  • tackifying resins include rosin, polymerized rosin, polymerized rosin ester, rosin phenol, stabilized rosin ester, disproportionated rosin ester, terpene, terpene phenol fat, petroleum resin, and the like.
  • Various tackifying resins can be mentioned.
  • cross-linking agents examples include known cross-linking agents such as isocyanate-based, epoxy-based, aziridine-based, polyvalent metal salt-based, metal chelate-based, keto-hydrazide-based, oxazoline-based, carbodiimide-based, silane-based, and glycidyl (alkoxy)epoxysilane-based agents. agents, which can be used for the purpose of improving the cohesive strength of the adhesive layer.
  • Other additives include known foaming agents, plasticizers, softeners, antioxidants, fillers such as glass and plastic fibers, balloons, beads, and metal powders, colorants such as pigments and dyes, and pH adjusters. agents, film forming aids, leveling agents, thickeners, water repellents, antifoaming agents and the like. These other additives can be added within a range that does not impair the desired effects of the present invention.
  • the thickness of the adhesive layer is preferably 10 ⁇ m or less, more preferably in the range of 1 ⁇ m to 5 ⁇ m.
  • the adhesive layer may contain the endothermic agent described above.
  • the foam sheet may also be a laminate having a flame barrier layer. If the foam sheet has a flame-blocking layer, even if the secondary battery catches fire due to rapid heat generation or temperature rise, the flame is blocked, which is effective in preventing or delaying the spread of fire to other battery cells.
  • the flame shielding layer is provided inside the adhesive layer.
  • the flame-shielding layer woven fabrics, non-woven fabrics, inorganic fiber sheets made of inorganic fibers, non-combustible paper, and the like can be suitably used.
  • the flame-shielding layer can be provided, for example, by laminating an inorganic fiber sheet on one surface of the foam sheet, as shown in FIG.
  • the inorganic fiber sheet that can be applied to the flame barrier layer include glass cloth made of glass wool, rock wool, glass fiber, or the like.
  • An inorganic fiber sheet may be used independently or may be used in combination of 2 or more types.
  • the thermal conductivity of the inorganic fiber sheet that can be applied to the flame barrier layer is preferably 0.1 W/m ⁇ K or less, more preferably 0.05 W/m ⁇ K or less, from the viewpoint of exhibiting good flame barrier properties. preferable.
  • the thermal conductivity of glass wool is about 0.045 W/m ⁇ K.
  • non-combustible paper that can be applied to the flame barrier layer include paper coated with, impregnated with, or internally added with a flame retardant to impart self-extinguishing properties and suppress the spread of flames.
  • the flame retardant include metal oxides such as magnesium hydroxide and aluminum hydroxide, basic compounds such as phosphates, borates and stefamates, and glass fibers.
  • the thickness of the flame barrier layer is not particularly limited, and can be set as appropriate within a range of, for example, 10 to 1000 ⁇ m. Further, the weight per unit area of the inorganic fiber sheet as the flame barrier layer is preferably 1 to 1000 mg/cm 2 .
  • the foam sheet is a laminate further comprising a layer containing a heat-absorbing agent and a resin as a matrix, and an adhesive layer, a flame-shielding layer, an adhesive layer, or other arbitrary layers, such a laminate
  • a method of applying the above-described adhesive to the surface of the release sheet, forming an adhesive layer by drying or the like, and transferring the adhesive layers to both surfaces of the foam sheet A step of superimposing a flame barrier layer via an adhesive layer according to the above, and transferring a prefabricated adhesive layer to the other surface of the foam sheet and the surface of the flame barrier layer, respectively; a heat absorbing material on the flame barrier layer It can be produced through a step of foaming by applying and heating a resin containing.
  • such a laminate can be produced by directly coating the above-described adhesive on both surfaces of the foam sheet and drying to form an adhesive layer.
  • adhesives capable of forming the adhesive layer include urethane resin adhesives, acrylic resin adhesives, polyester resin adhesives, and the like.
  • FIG. 2 is a partially cutaway perspective view showing a second embodiment of the secondary battery of the present invention.
  • the secondary battery 100 of the second embodiment will be described below, but the description will focus on the differences from the secondary battery 100 of the first embodiment, and the description of the same items will be omitted.
  • a plurality of cylindrical battery cells 1 are arranged inside a rectangular case 10 .
  • a foam sheet 20 is arranged on the inner surface of the case 10 .
  • the plurality of battery cells 1 are accommodated (arranged) in the case 10 in a matrix with the longitudinal direction (axial direction) being the thickness direction (height direction) of the case 10 .
  • an external connection positive electrode terminal 12 collectively connected to the plurality of positive electrode tabs 29 and an external connection negative electrode terminal 13 collectively connected to the plurality of negative electrode tabs 39 are provided. It is
  • each battery cell 1 can also be a normal cylindrical battery cell.
  • the outer periphery of each battery cell 1 may be covered with the foam sheet 30 , or a plurality of battery cells 1 arranged in a row may be collectively covered with the foam sheet 30 .
  • the foam sheet 30 having a flame barrier layer only on one side, the surface of the flame barrier layer faces the battery cell 1 (for example, the flame barrier layer is in contact with the battery cell 1).
  • the foam sheet 30 is preferably arranged.
  • the present invention is not limited to the configurations of the above-described embodiments.
  • any configuration for any other purpose may be added to the configurations of the above-described embodiments, or may be replaced with any configuration that exhibits similar functions.
  • the foam sheet 20 and the foam sheet 30 may each be a laminate in which a plurality of sheets are laminated.
  • foam sheet 100 parts by mass of resin 1 (water-dispersible acrylic resin emulsion), 6 parts by mass of foam stabilizer 1 (sulfonic acid-type anionic surfactant), and 3 parts by mass of cross-linking agent 1 (oxazoline group-containing polymer) are blended and stirred with a disper. Mixed (2000 rpm, 3 minutes) to make a mechanical foam binder. The prepared binder was stirred and foamed so that the foaming ratio was doubled, and the stirring was continued for 5 minutes to obtain a foamable mixture. The resulting foamable mixture was applied onto a polyethylene terephthalate (PET) film with an applicator. Next, after heating for 5 minutes at 105° C.
  • resin 1 water-dispersible acrylic resin emulsion
  • foam stabilizer 1 sulfonic acid-type anionic surfactant
  • cross-linking agent 1 oxazoline group-containing polymer
  • Sheet 1 had a specific gravity of 0.23 and a mass of 230 g/m 2 .
  • a cross section obtained by cutting the sheet 1 was confirmed with an electron microscope (Digital Microscope VHX-900 manufactured by Keyence Corporation).
  • Example 2 100 parts by mass of resin 1 (water-dispersible acrylic resin emulsion), 6 parts by mass of foam stabilizer 1 (sulfonic acid-type anionic surfactant), and 3 parts by mass of cross-linking agent 1 (oxazoline group-containing polymer) are blended and stirred with a disper. Mixed (2000 rpm, 3 minutes) to make a mechanical foam binder. The prepared binder was stirred and foamed so that the foaming ratio was doubled, and 240 parts by mass of aluminum hydroxide as an endothermic agent was added thereto, and stirring was continued for 5 minutes to obtain an foamable mixture. . The resulting foamable mixture was applied onto a polyethylene terephthalate (PET) film with an applicator.
  • PET polyethylene terephthalate
  • the sheet was heated at 120° C. for 3 minutes, turned over, and further heat-treated at 120° C. for 3 minutes for curing to produce a foamed sheet 2 having a thickness of 1 mm. .
  • the sheet 2 had a specific gravity of 0.64, a mass of 640 g/m 2 , and a mass of the endothermic agent in the sheet 2 of 514 g/m 2 .
  • a cross section obtained by cutting the sheet 2 was confirmed with an electron microscope (Digital Microscope VHX-900 manufactured by Keyence Corporation).
  • Examples 3-4 Sheets 3 and 4, which are foamed sheets, were produced in the same manner as in Example 2, except that the types and blending amounts of resin 1, foam stabilizer 1, cross-linking agent 1, and endothermic agent were as shown in Table 1.
  • Example 5 After applying 100 parts by mass of resin 2 (vinyl chloride resin paste) onto a PET film with an applicator, pre-drying was performed by heating at 100 ° C. for 5 minutes, followed by heat treatment at 140 ° C. for 10 minutes to cure. Sheet 5 was produced.
  • a plastisol coating solution was prepared by mixing 100 parts by mass of resin 2 (vinyl chloride resin paste) and 120 parts by mass of aluminum hydroxide as an endothermic agent, and this plastisol coating solution was applied onto a PET film using an applicator. After that, after heating for 5 minutes at 100° C. for preliminary drying, it was cured by heat treatment at 140° C. for 10 minutes to produce a sheet 6 having a thickness of 1 mm.
  • Example 1 Using the foam sheet 1 obtained in Example 1, a secondary battery of the first embodiment was produced.
  • Examples 2 to 4 Secondary battery modules were produced in the same manner as in Example 1 using the foamed sheets 2 to 4 obtained in Examples 2 to 4, respectively.
  • Example 5 A glass cloth (thickness: 140 ⁇ m) was laminated on one surface of the foamed sheet 1 obtained in Example 1 via an adhesive layer to obtain a laminate.
  • a secondary battery module was produced by sandwiching the obtained laminate between battery cells.
  • the inflection point at which the stress fluctuation range during compression begins to become ⁇ 10% is defined as the yield point
  • the point at which the stress against compression begins to increase again is defined as the effective strain end point
  • the compressibility at the effective strain end point was determined.
  • the stress-compressive strain curve of Example 1 illustrates the yield point and effective strain endpoint. Table 1 shows the results.
  • sheets 1 to 4 have a wide range of effective strain due to stress (from the yield point to the effective strain end point) and have a large compressibility at the effective strain end point. It is preferable as a sheet that can absorb the expansion of
  • the secondary battery of the present invention has a structure capable of absorbing expansion and contraction accompanying deterioration over time of the battery cells that constitute such a secondary battery. That is, it is useful in various applications as a secondary battery with improved battery safety as well as ensuring battery performance and battery life.

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Abstract

La présente invention aborde le problème de la fourniture d'une batterie secondaire ayant une structure qui peut absorber l'expansion ou la contraction de cellules de batterie constituant la seconde batterie associée à une détérioration dans le temps. La présente invention concerne une batterie secondaire caractérisée en ce qu'elle comprend au moins deux éléments de batterie, un boîtier recevant les éléments de batterie et une feuille de mousse positionnée sur la surface interne du boîtier et/ou une feuille de mousse positionnée de façon à isoler les éléments de batterie adjacents.
PCT/JP2023/001427 2022-02-04 2023-01-19 Batterie secondaire WO2023149212A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013514631A (ja) * 2009-12-21 2013-04-25 サン−ゴバン パフォーマンス プラスティックス コーポレイション 熱伝導性フォーム材料
JP2020139062A (ja) * 2019-02-28 2020-09-03 積水化学工業株式会社 バッテリー用クッション材
JP2021002420A (ja) * 2019-06-19 2021-01-07 積水化学工業株式会社 電池セル収納ケース及び電池パック
US20220037728A1 (en) * 2020-07-30 2022-02-03 Sk Innovation Co., Ltd. Lithium secondary battery and method of fabricating the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013514631A (ja) * 2009-12-21 2013-04-25 サン−ゴバン パフォーマンス プラスティックス コーポレイション 熱伝導性フォーム材料
JP2020139062A (ja) * 2019-02-28 2020-09-03 積水化学工業株式会社 バッテリー用クッション材
JP2021002420A (ja) * 2019-06-19 2021-01-07 積水化学工業株式会社 電池セル収納ケース及び電池パック
US20220037728A1 (en) * 2020-07-30 2022-02-03 Sk Innovation Co., Ltd. Lithium secondary battery and method of fabricating the same

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