WO2017158986A1 - Pile - Google Patents

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Publication number
WO2017158986A1
WO2017158986A1 PCT/JP2016/088762 JP2016088762W WO2017158986A1 WO 2017158986 A1 WO2017158986 A1 WO 2017158986A1 JP 2016088762 W JP2016088762 W JP 2016088762W WO 2017158986 A1 WO2017158986 A1 WO 2017158986A1
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WO
WIPO (PCT)
Prior art keywords
film
exterior material
battery cell
battery
thickness
Prior art date
Application number
PCT/JP2016/088762
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English (en)
Japanese (ja)
Inventor
健人 高橋
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 JP2018505266A priority Critical patent/JPWO2017158986A1/ja
Publication of WO2017158986A1 publication Critical patent/WO2017158986A1/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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/193—Organic material
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/191—Inorganic 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 a battery cell in which a power generation element is housed in a film-shaped exterior material and has high energy density and confidentiality.
  • Lithium ion batteries with large capacity density and mass density are installed not only for portable devices such as mobile phones and digital cameras, but also for electric bicycles, electric motorcycles, electric cars and the like. With the diversification of battery applications, battery weight reduction and design freedom are required.
  • a film-like exterior material in which a metal container, aluminum foil, etc. and a synthetic resin film are laminated is used.
  • a film-like exterior that is lightweight and has a high degree of freedom in shape is used.
  • the demand for battery cells using materials is increasing.
  • the battery cell is hermetically sealed so that a power generation element including a positive electrode and a negative electrode is covered with a film-shaped packaging material, and the positive electrode terminal and the negative electrode terminal are led out of the film-shaped packaging material.
  • Battery film-like packaging material has the role of preventing leakage of electrolyte inside and moisture intrusion into the battery, but this sealing part affects the reliability of the battery. Yes.
  • Patent Document 1 by providing a non-welded portion inside the heat-welded portion of the film-shaped exterior material, the occurrence of a notch-like portion due to the protrusion of the resin is prevented, and the peel strength is reduced. It has been proposed to prevent this.
  • Patent Document 2 in order to push out the electrolyte attached to the sealing part to the outside of the sealing part, the part where one side used for the injection of the electrolyte corresponds to the inner part of the battery is shorter, and the part corresponding to the outer side of the battery A technique of pressing so that the interval becomes wider has been proposed.
  • Patent Document 1 it is necessary to enlarge the accommodating part by the amount of space divided for the second resin part protruding to the accommodating part side, or to reduce the volume of the power generation element, and lower the energy density. Yes.
  • the thickness on the outer side of the heat seal portion is increased, and moisture easily enters from the outside.
  • the thickness of the heat seal portion outside is reduced to increase the peel strength of the heat seal portion, the thickness of the welded portion on the power generation element side, which is the inside of the heat seal portion, is further reduced, and the resin to the power generation element side is reduced. Protrusion becomes prominent.
  • the present invention solves the above-described problems, and the battery cell according to the present invention is housed in a film-shaped exterior material made of a laminate film in which the battery element is provided with at least a barrier layer and a resin layer.
  • the film-shaped packaging material includes a sealing portion that is heat-welded with the resin layers facing each other, and the sealing portion is a film-shaped packaging material from the battery element side at the end on the battery element side.
  • the outer edge of the film-shaped packaging material includes the portion whose thickness increases in the direction from the outer edge to the battery element side, and the outer edge of the film-shaped packaging material is within 0.5 mm.
  • the minimum thickness of the sealing portion to be removed is 40 or more when the thickness of two resin layers is 100.
  • the sealing when sealing the sealing portion by thermal welding, the sealing is performed so that the thickness increases from the battery element side of the sealing portion toward the outer side of the film-shaped exterior material on the battery element side. It stops, and it cut
  • the resin of the heat-welded resin layer is formed into a film by forming a portion where the sealing thickness increases from the battery element side toward the outer side.
  • the sealing thickness is as much as the outer edge while removing the resin protrusion outside the film-like exterior material generated during the welding on the outside of the film-like exterior material of the sealing portion.
  • the battery cell which concerns on this invention, it is possible to make a battery element large and to make the shape of a film-shaped exterior material small, since the protrusion part of the resin of the battery element side end of a sealing part becomes small. Therefore, the energy density per volume can be increased, and by suppressing the ingress of moisture from the outside, it is possible to inhibit the invaded moisture from being decomposed and expanded into a gas, thereby preventing the film-like exterior material from cracking.
  • the protruding portion of the resin formed inside the battery can be reduced, and moisture entry from the outside can also be suppressed.
  • the energy density per volume is high and long-term A battery cell having excellent reliability can be provided.
  • FIG. 1 is a plan view illustrating an example of the battery cell 1.
  • FIG. 2 is a plan view for explaining a battery cell 1 in which a power generation element 6 is housed in a film-shaped exterior member 4 together with an electrolyte (not shown) and the like, and is joined to each of a positive electrode extraction terminal and a negative electrode extraction terminal extracted from the power generation element 6.
  • the positive electrode terminal 2 and the negative electrode terminal 3 are provided.
  • the positive electrode terminal 2 and the negative electrode terminal 3 are protruded from the film-shaped exterior material 4 and are thermally welded and sealed around the film-shaped exterior material 4.
  • FIG. 1 shows an example in which the power generation element is stored by two films provided with a storage section for the power generation element, and all the surroundings of both members are sealed.
  • the present invention is not limited to this. After storing the power generation element in a storage portion formed by deforming a part of the exterior material 4 by press molding, the other end side of the film-shaped exterior material is bent and overlaid on the storage portion of the power generation element and sealed. The positive electrode terminal and the negative electrode terminal may be taken out.
  • a film-shaped exterior material that is sealed after a power generation element is housed in a member processed into a cylindrical shape or an envelope shape.
  • the power generation element is a laminate in which a plurality of positive electrodes, separators, and negative electrodes are sequentially laminated, or a belt-like separator, a belt-like positive electrode, a belt-like negative electrode, and a belt-like separator are sequentially laminated and wound.
  • the wound body etc. which were made can also be used.
  • FIG. 2 is a diagram schematically showing a cross section taken along the line A-A ′ and the structure around it in the heat-welded portion located at the periphery of the battery cell 1 shown in FIG. 1.
  • FIG. 2A is a schematic diagram showing a sealed state of the battery cell 1 according to the present invention
  • FIG. 2B is a schematic diagram showing a sealed state of a conventional general battery cell.
  • the film-shaped packaging material 4 that houses the battery element 6 includes a surface protective layer 11 that protects the outer surface, a barrier layer 12 such as a metal barrier layer that blocks the permeation of gas, and prevents the electrolyte from penetrating. It is the structure containing the heat welding resin layer 13 which heat-welds.
  • the surface protective layer 11 may be made of a synthetic resin material that has a ductility that does not break during processing of the film-shaped exterior material 4 and that has a higher melting point or softening point than the heat-welded resin layer 13.
  • a resin having sufficient ductility during processing and having a high melting point or softening point is preferable.
  • Specific examples thereof include nylon and polyethylene terephthalate, and these may be combined.
  • barrier layer 12 has a ductility that prevents gas permeation and does not break during processing
  • various types of metal or metal oxide deposition layers, metal films, and the like can be used.
  • a superior aluminum or aluminum alloy foil is desirable.
  • the heat-welded resin layer 13 is corrosion resistant to the electrolytic solution and has excellent adhesive strength at the time of heat-welding.
  • Polyolefin-based synthetic resins such as polypropylene and polyethylene, modified polyolefin resins obtained by modifying these, or a plurality of them Can be used.
  • the surface protective layer 11, the barrier layer 12, and the heat-welded resin layer 13 are not limited to being composed of only one layer, but may be a laminate of two or more layers. In the case where a plurality of layers are laminated, a plurality of layers having different characteristics may be laminated.
  • the heat-welded resin layer 13 reaches the melting point, and forms a weld layer 17a.
  • a resin protrusion 17b that protrudes from the welded layer is formed on the storage portion side of the battery element 6 of the sealing portion 16.
  • the battery element 1 at the end of the battery element 6 side, in order to reduce the resin protrusion 17b, the battery element 1 includes a portion that increases in thickness from the battery element 6 side to the outer side of the film-shaped exterior material 4, In order to suppress the amount of moisture entering from the outer side of the outer packaging material 4 to the battery element 6 side, the outer end portion of the film-like outer packaging material 4 includes a portion where the thickness increases from the outer edge toward the battery element 6.
  • FIG. 3 is a diagram schematically illustrating an example of the manufacturing method of the battery cell 1 according to the present invention described in FIG.
  • the heat-welded resin layer 13 in a molten state forms a resin protrusion 17b that protrudes to the storage portion side of the battery element 6 and a resin protrusion 17c that protrudes to the outer end of the film-like exterior material 4.
  • the heating member 21 is inclined so that the heating member 21 is sealed thicker on the outer side of the film-shaped exterior material 4 than the battery element 6 side.
  • the region where the heating member 21 is in contact is cooled by two cooling members 22 from both sides. This is to prevent the welded layer 17a from crystallizing.
  • crystallization of the welded layer 17a proceeds and a hard and brittle resin layer is formed, resulting in a decrease in corrosion resistance and insulation.
  • the resin thickness of the welding layer 17a on the battery element 6 side is reduced.
  • the resin thickness of the welding layer 17a is smaller than that when the resin thickness is large, the insulating property tends to be lowered. Therefore, in order to prevent a decrease in insulation, that is, to prevent crystallization of the resin on the battery element 6 side, the cooling member is securely applied to the film at the position corresponding to the thinnest part of the resin layer of the welding layer 17a on the battery element 6 side. It is preferable to contact.
  • polypropylene is used for the heat-welded resin layer 13 it is preferable to press the cooling member 22 before the temperature at the battery element 6 side end falls below 110 ° C.
  • each side of the outer periphery of the film-shaped packaging material 4 was thermally welded and sealed except for the side where the electrolytic solution was injected.
  • the electrolytic solution injection part was thermally welded and sealed in the same manner as other parts. Thereafter, the periphery of each side was cut into a predetermined shape to obtain a battery cell 1.
  • the thickness of the sealing portion 16 increases, moisture easily enters. However, if the thickness of the sealing portion 16 is too small, the insulating property is deteriorated.
  • the thickness of the weld layer 17a is preferably 40 or more and 95 or less over the entire sealing part 16 excluding the outer end part 0.5 mm of the sealing part 16, more preferably Is 45 or more and 90 or less.
  • the outer edge of the sealing portion 16 may have the conductive barrier layer 12 exposed in the first place, so that insulation is not required and the thickness of the welded layer is smaller from the viewpoint of preventing moisture from entering. Is preferred.
  • the thickness of the two layers in the weld layer 13 other than the weld part where heat is not applied is 100, the thickness is 0 or more and 95 or less within 0.5 mm from the outer edge of the sealing part 16 to the battery element 6 side. Is preferred.
  • a film-shaped outer packaging material 4 is prepared by preparing a cutting blade in which the angle of the cutting edge of the cutting blade, the angle of the belly of the cutting blade thicker than the cutting edge, and the frictional force are adjusted. It is possible to cut while reducing the thickness of the sealing outer edge.
  • the thickness of the heat-welded resin layer 13 is preferably 60 ⁇ m or more from the viewpoint of maintaining insulation, and preferably 200 ⁇ m or less from the viewpoint of sealing properties.
  • the length of the sealing part 16 (or the width of the sealing part 16) from the battery element 6 side to the outer edge of the film-shaped exterior material 4 is short, the sealing performance between the battery element 6 and the outside is deteriorated.
  • the length of the sealing part 16 (or the width of the sealing part 16) is preferably at least 2 mm. From the viewpoint of airtightness, the longer the length of the sealing portion 16 (or the width of the sealing portion 16), the better. However, since the outer dimensions of the battery cell 1 increase accordingly, the viewpoint of energy efficiency per volume. It is not preferable.
  • the film-shaped exterior material 4 for example, when a modified polyolefin is used for the heat welding resin layer 13, the melting point is about 120 to 160 ° C. Is preferably 180 to 220 ° C.
  • the heating temperature at the time of sealing is preferably 200 ° C. or lower in order not to damage the surface protective layer 11.
  • FIG. 4 is a diagram for explaining another embodiment of the present invention.
  • FIG. 2 is a view in which the battery cell shown in FIG. 1 of the present invention is partially cut away at A-A ′. It heats until it presses by the two heating members 23 from both surfaces of the sealing part 16 and the welding surface of the heat welding resin layer 13 will be in a molten state.
  • the heating member 23 is provided with an inclination so that the outer side of the film-shaped outer packaging material 4 is thicker than the battery element 6 side like the heating member 21, but unlike the heating member 21, the outer side of the film-shaped outer packaging material 4 is provided.
  • a second slope is also provided so that the vicinity of the end is narrowly sealed.
  • the battery of this embodiment can also obtain the product similar to the process of FIG. 3 without a cutting process by welding the outer edge part of the film film-shaped exterior material 4, ie, not providing the disposal part 25.
  • this invention may be applied to any sealing part 16 of the periphery of the battery cell 1 shown in FIG. 1, the width
  • FIG. 6 is a diagram showing variations of the heating member that can be used in the manufacturing process of the battery cell 1 according to the present invention.
  • Example 1 (Preparation of positive electrode) A positive electrode slurry was prepared by kneading lithium manganate (LiMn 2 O 4 ) powder, carbon black, and polyvinylidene fluoride together with NMP (N-methyl-pyrrolidone). The obtained positive electrode slurry was applied and dried on both surfaces of an aluminum foil having a thickness of 20 ⁇ m, and then the positive electrode surface was pressed with a roll to form a positive electrode active material layer on the aluminum foil.
  • NMP N-methyl-pyrrolidone
  • a rectangular positive electrode active material layer forming portion having a length of 105 mm ⁇ width 55 mm including a portion where the positive electrode active material layer is formed, and a positive electrode tab having a length of 15 mm ⁇ width 10 mm including a portion where the positive electrode active material layer is not formed
  • the aluminum foil containing the part in which the positive electrode active material layer was formed was cut so that the positive electrode was produced.
  • Graphite, carbon black, and polyvinylidene fluoride were kneaded with NMP to prepare a negative electrode slurry.
  • the obtained negative electrode slurry was applied to and dried on both sides of a copper foil having a thickness of 10 ⁇ m, and then the negative electrode surface was pressed with a roll to form a negative electrode active material layer on the copper foil.
  • a negative electrode in which a negative electrode active material layer forming portion having a length of 109 mm and a width of 59 mm and a negative electrode tab having a length of 12 mm and a width of 10 mm were integrally formed was produced.
  • the prepared positive electrode and negative electrode were laminated by alternately stacking 15 positive electrodes and 16 negative electrodes through a polypropylene separator having a length of 111 mm, a width of 59 mm, and a thickness of 25 ⁇ m so that the outermost layer becomes a negative electrode. A power generation element was produced.
  • a synthetic resin layer integrated with the film-shaped exterior material at the time of sealing was formed on a part of an aluminum foil having a length of 30 mm, a width of 10 mm, and a thickness of 200 ⁇ m as a positive electrode lead terminal for leading out of the film-shaped exterior material 4. It joined to the positive electrode tab of the positive electrode which laminated
  • a negative electrode tab in which a copper lead terminal in which a synthetic resin layer integrated with a film-like exterior material is formed on a copper foil having a length of 30 mm, a width of 10 mm, and a thickness of 200 ⁇ m as a negative electrode lead terminal is formed as a negative electrode lead terminal.
  • Joined. 25 ⁇ m thick nylon as the surface protective layer 11, 40 ⁇ m aluminum foil as the barrier layer 12, and polypropylene having a random-block-random three-layer structure with a melting point of 145 ° C. and a softening point of 120 ° C. as a heat-welded resin layer 13
  • Two film-shaped exterior materials having a length of 180 mm and a thickness of 100 mm and a thickness of 115 ⁇ m, which are laminated in order, are prepared. Formed.
  • the power generation element 6 is housed in the produced recess, and the positive electrode lead terminal and the negative electrode lead terminal are led out of the film-shaped exterior material 4 from one side, and the side where the lead terminal is taken out and the two sides that are in contact with the side where the lead terminal is taken out Sealed to form a positive electrode terminal and a negative electrode terminal.
  • the terminal side was sealed by sandwiching two heating members having a width of 5 mm heated to 180 ° C. for 6 seconds so that the interval was 0.2 mm.
  • the side was sealed using a heating member having a shape as shown in FIG. d1 was 0.01 mm and d2 was 0.30 mm.
  • FIG. 5 (B) the two heating members having a width of 7.5 mm heated to 180 ° C. were sandwiched and heated for 5 seconds so that the distance d3 was 0.2 mm, and sealed. Thereafter, two cooling bars having the same shape as the heating member and having a room temperature width of 7.5 mm were sandwiched and cooled for 3 seconds.
  • the electrolyte solution was injected into the battery cell before injection prepared as described above from the injection side.
  • FIG. 5C shows another form of heating member applied to the sealing portion 16 of the battery cell.
  • the interval d4 was set to 0.2 mm.
  • Example 2 A battery cell was obtained in the same manner as in Example 1 except that the distance d3 between the heating bars was 0.21 mm during the thermal welding of the side and liquid injection sides.
  • Example 3 A battery cell was obtained in the same manner as in Example 1 except that the distance d3 between the heating bars was 0.22 mm during the thermal welding of the side and liquid injection sides.
  • Example 4 A battery cell was obtained in the same manner as in Example 1 except that the distance d3 between the heating bars was 0.17 mm during the thermal welding of the side and liquid injection sides.
  • Example 5 At the time of thermal welding of the side and the liquid injection side, welding was performed using the heating member of FIG. 3, and the other steps were performed in the same manner as in Example 1 by cutting the outer edge 1 mm of the battery cell sealing portion 16, thereby sealing. A battery cell having a thin outer edge of the stopper 16 was obtained.
  • Comparative Example 1 At the time of thermal welding of the side and liquid injection sides, the distance d3 between the heating bars was set to 0.16 mm, and the other steps were performed in the same manner as in Example 1 to obtain a battery cell. A cross-sectional view of the sealing portion 16 of this battery cell is shown in FIG.
  • Comparative Example 3 A battery cell was obtained in the same manner as in Example 1 except that the distance d3 between the heating bars was 0.23 mm during the thermal welding of the side and liquid injection sides. A cross-sectional view of the sealing portion 16 of this battery cell is shown in FIG. However, compared to Example 1, the resin thickness is thicker. Details will be described later.
  • Table 1 shows the results of measuring the minimum sealing thickness, the maximum sealing thickness, the protrusion size, the peel strength, and the insulation resistance of Examples 1 to 5 and Comparative Example.
  • the measurement of the minimum sealing thickness is based on the minimum thickness at a position where the distance from the power generation element side in the width direction of the sealing portion 16 is 2 mm, where moisture intrusion and resin protrusion are particularly likely to affect the element side. It is measured.
  • the minimum sealing thickness and the maximum sealing thickness in Table 1 are the thicknesses of two heat-welded resin layers, and the numbers in parentheses are the thicknesses of two heat-welded resin layers 13 in a portion not thermally welded. Represents the ratio to. In the part not heat-welded, it is necessary to prevent the electrolytic solution, the barrier layer 12 of the film-shaped exterior material 4 and the electrolytic solution from coming into contact with each other. Yes.
  • the protruding portion 17b With respect to the size of the protruding portion 17b, in Example 4, since the pressure and heating were excessively performed until the thickness of the heat-welded resin layer 13 became too small, the protruding portion 17b was larger than in Examples 1 to 3, but the power generation It did not affect the containment of the elements. Note that the size L1 of the protrusion 17b in Examples 1 to 3, and 5 was 1.2 mm or less, and in Example 4, the maximum was 1.5 mm.
  • Comparative Example 1 due to being too thinly sealed, L1 was increased until the protruding portion 17b exceeded 1.5 mm, and the battery element 6 having the same shape as that of Example 1 could not be accommodated.
  • Comparative Example 2 since the shape of the overheating bar is flat, it is not possible to suppress the resin from protruding to the battery element 6 side, and the size of the protruding portion 17b is increased, so that the battery element 6 having the same shape as that of Example 1 is used. could not be accommodated.
  • Example 3 was 6 N / mm, Example 2 was 4 N / mm, and Comparative Example 3 was less than 4 N / mm. In other examples, a peel strength of 7 N / mm or more could be obtained.
  • the sealing portion 16 heat is generated by forming a portion where the sealing thickness increases from the battery element 6 side toward the outer side.
  • the resin of the welded resin layer 13 protrudes preferentially to the outside of the film-shaped exterior material 4 but also the outside of the film-shaped exterior material 4 of the sealing portion 16 on the outside of the film-shaped exterior material 4 generated during the welding.
  • the battery element 6 since the protrusion part of the resin of the battery element 6 side end of the sealing part 16 becomes small, the battery element 6 is formed large and the shape of the film-form exterior material 4 is formed. Since the energy density per volume can be increased and the entry of moisture from the outside can be suppressed, the invaded moisture is decomposed to become a gas and expand to form a crack in the film-shaped exterior material 4. This can be suppressed.
  • the protrusion part 17b of the resin formed in the inside of a battery can be reduced, and also the moisture permeation from the outside can be suppressed, As a result, the energy density per volume is high.
  • a battery cell with excellent long-term reliability can be provided.
  • the present invention relates to a battery cell such as a lithium ion battery, which has recently been installed not only for portable devices but also for electric motorcycles, electric cars, etc., and whose applications are rapidly expanding.
  • a battery cell such as a lithium ion battery
  • problems such as space efficiency being reduced or peeling strength of the heat seal portion being lowered due to the protruding portion of the resin protruding when heat-sealing occurred.
  • the resin protruding portion of the heat seal portion can be reduced, and further, moisture can be prevented from entering from the outside, thereby reducing deterioration of the battery cell. Therefore, a battery cell with high energy density per volume and excellent long-term reliability can be provided, and industrial applicability is very large.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

Le but de la présente invention est de pourvoir à une pile présentant de la fiabilité à long terme et une haute densité d'énergie par unité de volume à l'aide d'un matériau extérieur du type film pour le corps extérieur. La pile 1 selon la présente invention comporte un élément de batterie 6 logé dans le matériau extérieur du type film 4 qui comprend un film stratifié comportant au moins une couche barrière 12 et une couche de résine thermosoudée 13. La pile 1 est caractérisée en ce que : le matériau extérieur du type film 4 comprend une partie joint 16 dans laquelle des couches de résine thermosoudées 13 opposées ont été thermosoudées l'une à l'autre ; la partie joint 16 comprend, au niveau d'une partie d'extrémité du côté de l'élément de batterie 6, une partie dont l'épaisseur s'accroît dans le sens allant du côté élément de batterie 6 vers le côté extérieur du matériau extérieur du type film 4, et, au niveau d'une partie d'extrémité du côté extérieur du matériau extérieur du type film 4, une partie dont l'épaisseur s'accroît dans le sens allant du bord extérieur vers le côté élément de batterie 6 ; et, sauf à moins de 0,5 mm de la partie d'extrémité extérieure du matériau extérieur du type film 4, l'épaisseur minimale de la partie joint 16 est supérieure ou égale à 40 si 100 est l'épaisseur de 132 couches de résine thermosoudées.
PCT/JP2016/088762 2016-03-15 2016-12-26 Pile WO2017158986A1 (fr)

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JP2016050865 2016-03-15
JP2016-050865 2016-03-15

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WO2017158986A1 true WO2017158986A1 (fr) 2017-09-21

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019110016A (ja) * 2017-12-18 2019-07-04 パナソニックＩｐマネジメント株式会社 薄型電池
WO2020059730A1 (fr) * 2018-09-21 2020-03-26 積水化学工業株式会社 Procédé de fabrication de batterie secondaire stratifiée et dispositif d'étanchéité
JP2020053121A (ja) * 2018-09-21 2020-04-02 積水化学工業株式会社 積層型電池及び積層型電池の製造方法
JP2020053120A (ja) * 2018-09-21 2020-04-02 積水化学工業株式会社 積層型電池及び積層型電池の製造方法
JP2021044185A (ja) * 2019-09-12 2021-03-18 積水化学工業株式会社 蓄電素子および蓄電素子の製造方法
JP2023518520A (ja) * 2020-03-24 2023-05-01 東莞新能安科技有限公司 電気化学装置及び電子装置
WO2023176489A1 (fr) * 2022-03-16 2023-09-21 株式会社村田製作所 Batterie secondaire

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