WO2024034262A1 - Secondary battery housing member - Google Patents

Secondary battery housing member Download PDF

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Publication number
WO2024034262A1
WO2024034262A1 PCT/JP2023/022794 JP2023022794W WO2024034262A1 WO 2024034262 A1 WO2024034262 A1 WO 2024034262A1 JP 2023022794 W JP2023022794 W JP 2023022794W WO 2024034262 A1 WO2024034262 A1 WO 2024034262A1
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WO
WIPO (PCT)
Prior art keywords
secondary battery
metal case
housing member
battery housing
outer peripheral
Prior art date
Application number
PCT/JP2023/022794
Other languages
French (fr)
Japanese (ja)
Inventor
崇 水越
Original Assignee
株式会社村田製作所
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Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2024034262A1 publication Critical patent/WO2024034262A1/en

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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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
    • 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
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • 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
    • H01M50/179—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/184—Sealing members characterised by their shape or structure
    • 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
    • H01M50/202—Casings or frames around the primary casing of a single cell or a single battery
    • 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
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/284—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with incorporated circuit boards, e.g. printed circuit boards [PCB]
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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

Definitions

  • the present disclosure relates to a secondary battery housing member.
  • the secondary battery is housed in a container or the like while being integrated with peripheral components such as a board. Therefore, the secondary battery and peripheral components may be collectively referred to as a secondary battery housing member.
  • a metal case is sometimes used as an exterior material, and an electrode assembly is housed in the metal case. In such a secondary battery, when the electrode assembly generates heat, the internal pressure of the metal case increases.
  • a thin wall portion (explosion-proof valve) is provided at the bottom of the metal case. When the internal pressure of the metal case reaches a predetermined value, the thin wall portion cleaves and the pressure of the metal case is released.
  • the thin wall portion may not rupture even if the internal pressure of the metal case reaches a predetermined value. In other words, it is difficult to form a thin wall portion (explosion-proof valve) that ruptures when the internal pressure reaches a predetermined value. Therefore, it is desired to be able to suppress the increase in internal pressure of the metal case without forming a thin wall portion (explosion proof valve).
  • an object of the present disclosure is to provide a secondary battery housing member that can suppress an increase in internal pressure of a metal case.
  • a secondary battery accommodating member includes an electrode assembly, a metal case having an opening opening in a first direction and accommodating the electrode assembly therein, and being inserted into the opening, A secondary battery having a sealing member that seals the opening, a lead that penetrates the sealing member and is connected to the electrode assembly, a substrate connected to the lead, and a secondary battery that is connected to the electrode assembly. It has a welded resin part and a regulating member arranged in a second direction opposite to the first direction with respect to the metal case.
  • the metal case has a cylindrical shape, and includes a cylindrical portion in which the opening is provided at an end in the first direction, and a bottom portion that closes the second direction of the cylindrical portion. .
  • the resin portion covers the outer peripheral side of the cylindrical portion, the opening, and the sealing member.
  • the regulating member is arranged apart from the bottom in the second direction. At least a portion of the regulating member faces the bottom portion.
  • the metal case when the internal pressure of the metal case reaches a predetermined value, the metal case moves in the second direction. Therefore, the volume inside the metal case increases, and an increase in internal pressure is suppressed. Furthermore, since the metal case contacts the regulating member, it does not move significantly.
  • FIG. 1 is a cross-sectional view of the secondary battery housing member of Embodiment 1 taken along the winding center.
  • FIG. 2 is an enlarged view of the secondary battery.
  • FIG. 3 is a sectional view taken along the line III-III in FIG.
  • FIG. 4 is a view seen from the direction of arrow IV in FIG.
  • FIG. 5 is a cross-sectional view showing a state in which the metal case has moved in the second direction in the secondary battery housing member of Embodiment 1.
  • FIG. 6 is a cross-sectional view showing a state in which the metal case moves in the second direction and comes into contact with the regulating member in the secondary battery housing member of Embodiment 1.
  • FIG. 1 is a cross-sectional view of the secondary battery housing member of Embodiment 1 taken along the winding center.
  • FIG. 2 is an enlarged view of the secondary battery.
  • FIG. 3 is a sectional view taken along the line III-III in FIG.
  • FIG. 4 is a view seen from the
  • FIG. 7 is a cross-sectional view of the secondary battery housing member of Embodiment 1 taken along the winding center.
  • FIG. 8 is a cross-sectional view taken along the center line of the secondary battery housing member of the second embodiment, and more specifically, a cross-sectional view taken along the line VIII-VIII in FIG. 10.
  • FIG. 9 is a cross-sectional view taken along the centerline direction of the secondary battery housing member of the second embodiment, and more specifically, a cross-sectional view taken along line IX-IX in FIG. 10.
  • FIG. 10 is a sectional view taken along line XX in FIG. 8.
  • FIG. 11 is a cross-sectional view of the secondary battery housing member of Embodiment 2 in a state where the metal case has moved in the second direction and is in contact with the regulating member.
  • FIG. 12 is a cross-sectional view of the secondary battery housing member of Embodiment 3 taken along the center line.
  • FIG. 13 is a cross-sectional view of the secondary battery housing member of Embodiment 4 taken along the center line.
  • FIG. 14 is a view seen from the direction of arrow XIV in FIG. 13.
  • FIG. 15 is a cross-sectional view of the secondary battery housing member of Embodiment 5 taken along the center line.
  • FIG. 16 is a cross-sectional view of the secondary battery housing member of Embodiment 5 in a state where the metal case has moved in the second direction and is in contact with the regulating member.
  • FIG. 17 is a cross-sectional view of the secondary battery housing member of Comparative Example 1 taken along the centerline direction.
  • FIG. 18 is a view seen from the direction of arrow XVIII in FIG. 17.
  • FIG. 19 is a cross-sectional view of the secondary battery housing member of Comparative Example 3 taken along the centerline direction.
  • FIG. 20 is a cross-sectional view of the secondary battery housing member of Comparative Example 4 taken along the centerline direction.
  • FIG. 21 is a cross-sectional view of the secondary battery housing member of Comparative Example 5 taken along the centerline direction.
  • FIG. 1 is a cross-sectional view of the secondary battery housing member of Embodiment 1 taken along the winding center.
  • the secondary battery housing member 100 includes a secondary battery 1, a substrate 30, a resin portion 40, a regulating member 50, and a housing member 60.
  • FIG. 2 is an enlarged view of the secondary battery.
  • the secondary battery 1 is, for example, a lithium ion secondary battery, and includes an electrode assembly 2, a metal case 10, a sealing member 20, and two leads 31.
  • the electrode assembly 2 includes a wound body 4 and two tabs 5 extending from the wound body 4.
  • the wound body 4 includes a positive electrode 6, a negative electrode 7, and a separator 8.
  • the positive electrode 6 includes a positive electrode current collector and positive electrode active material layers disposed on both sides of the positive electrode current collector.
  • the positive electrode current collector is, for example, a thin film of a conductive material such as aluminum.
  • the positive electrode active material layer is a thin film formed from a mixture of a plurality of materials (positive electrode materials) used in forming a positive electrode in a lithium ion secondary battery.
  • the positive electrode material includes, for example, a positive electrode active material, a binder, and a conductive material.
  • the negative electrode 7 includes a negative electrode current collector and negative electrode active material layers disposed on both sides of the negative electrode current collector.
  • the negative electrode current collector is a thin film of conductive material such as aluminum, copper, nickel, and stainless steel, for example.
  • the negative electrode active material layer is a thin film formed from a mixture of a plurality of materials (negative electrode materials) used in forming the negative electrode in a lithium ion secondary battery.
  • the negative electrode material includes, for example, a negative electrode active material, a binder, a conductive material, and a thickener.
  • the positive electrode 6, the negative electrode 7, and the separator 8 form a band shape.
  • the wound body 4 is manufactured by laminating the positive electrode 6, separator 8, negative electrode 7, and separator 8 in this order, and winding the laminated body. Further, a protective tape 9 is adhered to the outer peripheral surface of the wound body 4.
  • a winding center O the center around which each of the positive electrode 6, the negative electrode 7, and the separator 8 is wound will be referred to as a winding center O (see FIG. 2). Further, a direction parallel to the winding center O is referred to as a centerline direction.
  • One of the two tabs 5 is connected to the positive electrode current collector of the positive electrode 6, and the other is connected to the negative electrode current collector of the negative electrode 7.
  • the two tabs 5 protrude from the wound body 4 in one direction in the centerline direction.
  • the direction in which the tab 5 protrudes will be referred to as a first direction X1
  • the opposite direction will be referred to as a second direction X2.
  • the ends of the two tabs 5 in the first direction X1 are welded to the lead 31.
  • Electrolyte solution 3 is sealed in the metal case 10. Electrolyte solution 3 is impregnated into each of positive electrode 6, negative electrode 7, and separator 8.
  • the metal case 10 is a cylindrical component with a bottom that opens in the first direction X1. That is, the metal case 10 has a cylindrical portion 11 having a cylindrical shape centered on the winding center O, and a bottom portion 12 that closes off the second direction X2 of the cylindrical portion 11.
  • FIG. 3 is a sectional view taken along the line III-III in FIG. 1.
  • the cross-sectional shape of the cylindrical portion 11 corresponds to the shape of the outer periphery of the electrode assembly 2, and is circular. That is, the cylindrical portion 11 has a cylindrical shape.
  • an opening 13 is provided at the end of the cylindrical portion 11 in the first direction X1. A sealing member 20 is inserted into this opening 13.
  • the sealing member 20 is made of an elastic material such as rubber.
  • the sealing member 20 fits into the inner peripheral surface of the cylindrical portion 11 and seals the opening 13. Furthermore, the sealing member 20 is provided with two through holes 21 through which the wiring (tab 5, lead 31) passes.
  • a flange portion 14 that is bent toward the opening 13 (crimped) is provided. This makes it difficult for the sealing member 20 to come off from the opening 13. Furthermore, a convex portion 15 that is recessed inward is provided near the end of the cylindrical portion 11 in the first direction x1. This convex portion 15 extends in the circumferential direction. The convex portion 15 presses the outer peripheral surface of the sealing member 20, causing the sealing member 20 to be elastically deformed. Thereby, a gap is less likely to occur between the sealing member 20 and the inner circumferential surface of the cylindrical portion 11, and sealing performance is improved.
  • FIG. 4 is a view seen from the direction of arrow IV in FIG. 1.
  • the bottom portion 12 has a circular shape.
  • a surface 12a of the bottom portion 12 in the second direction X2 is a flat surface. That is, the bottom portion 12 is not provided with a thin portion such as a cut. Therefore, the bottom portion 12 does not have the function of an explosion-proof valve.
  • the board 30 is a control board for suppressing over-discharging and over-charging of the electrode assembly 2.
  • the substrate 30 is connected to two leads 31 of the secondary battery 1.
  • the substrate 30 extends perpendicularly to the centerline direction and is fixed to the housing member 60. Further, the substrate 30 is arranged in the first direction X1 of the metal case 10 and faces the opening 13.
  • the resin part 40 includes a resin sealing part 41 provided between the opening 13 and the substrate 30, and an outer peripheral wall part 42 disposed in the second direction X2 of the resin sealing part 41.
  • the outer peripheral wall portion 42 and the resin sealing portion 41 are integrally formed by injection molding. Note that the resin part 40 of the present disclosure may be manufactured by a manufacturing method other than the injection molding method.
  • the resin sealing part 41 is welded to the sealing member 20 and the collar part 14 from the first direction X1. This makes it difficult for liquid or moisture to enter the inside of the metal case 10. Further, the resin sealing part 41 is welded to the substrate 30. Therefore, the resin portion 40 is integrated with the substrate 30.
  • the outer peripheral wall portion 42 extends from the resin sealing portion 41 in the second direction X2. Specifically, the outer peripheral wall portion 42 is a portion extending in the second direction X2 from the surface 14a of the collar portion 14 in the first direction X1. In other words, the outer peripheral wall portion 42 is a portion of the resin portion 40 that extends in the second direction X2 along the outer peripheral surface of the cylindrical portion 11 of the metal case 10 from the surface including the surface 14a.
  • the outer peripheral wall portion 42 has an annular (cylindrical) shape (see FIGS. 3 and 4). According to this outer peripheral wall portion 42, the liquid or moisture within the housing member 60 becomes difficult to move toward the opening 13 of the metal case 10. Therefore, the sealing performance of the metal case 10 is greatly improved.
  • the end surface 42a of the outer peripheral wall portion 42 in the second direction X2 is located further in the first direction X1 than the bottom portion 12 of the metal case 10. Further, the outer peripheral wall portion 42 is welded to the outer peripheral surface of the metal case 10. Regarding the welding strength of the resin part 40, the welding strength between the resin sealing part 41 and the substrate 30 is higher than the welding strength between the outer peripheral wall part 42 and the metal case 10. Therefore, when the internal pressure of the metal case 10 increases and a load acts on the metal case 10 in the second direction X2, the resin part 40 remains welded to the substrate 30, and only the metal case 10 moves in the second direction X2. Moving. That is, the resin part 40 does not move in the second direction X2 together with the metal case 10.
  • the regulating member 50 is an L-shaped member fixed to the housing member 60 in cross-sectional view.
  • the regulating member 50 is spaced apart from the bottom portion 12 in the second direction X2.
  • the regulating member 50 is arranged in the centerline direction with respect to the bottom part 12. That is, the regulating member 50 faces the bottom 12 and can come into contact with the bottom 12 when the metal case 10 moves in the second direction X2. Note that in the present disclosure, all of the regulating members 50 do not need to face the bottom 12, and at least a portion of the regulating members 50 only needs to face the bottom 12.
  • FIG. 5 is a cross-sectional view showing a state in which the metal case has moved in the second direction in the secondary battery housing member of Embodiment 1.
  • the secondary battery housing member 100 of the first embodiment when the secondary battery 1 generates heat, the internal pressure of the metal case 10 increases.
  • a load acts on the sealing member 20 in the first direction X1
  • a load acts on the metal case 10 in the second direction X2.
  • the sealing member 20 is supported by the resin sealing part 41 and the substrate 30 and does not move in the first direction X1. Therefore, as shown in FIG. 5, the position of the sealing member 20 does not change, while the metal case 10 moves in the second direction X2.
  • the volume of the metal case 10 is substantially increased, and an increase in the internal pressure of the metal case 10 is suppressed.
  • FIG. 6 is a cross-sectional view showing a state in which the metal case moves in the second direction and comes into contact with the regulating member in the secondary battery housing member of Embodiment 1. Further, when the amount of increase in the internal pressure of the metal case 10 is large, the metal case 10 moves significantly in the second direction X2. Then, the surface 12a of the bottom portion 12 of the metal case 10 contacts the surface 51 of the regulating member 50 in the first direction X1. As a result, the movement of the metal case 10 is stopped. Note that the metal case 10 moves along the outer peripheral wall portion 42. Therefore, the metal case 10 reliably contacts the regulating member 50.
  • the metal case 10 moves significantly in the second direction X2. Therefore, it is possible to avoid damage to the equipment incorporating the housing member 60 and the secondary battery housing member 100.
  • FIG. 7 is a cross-sectional view of the secondary battery housing member of Embodiment 1 taken along the winding center. Next, details of the secondary battery housing member 100 of Embodiment 1 will be described.
  • the distance (hereinafter referred to as separation distance) between the surface 12a of the bottom portion 12 and the surface 50a of the regulating member 50 in the first direction X1 is X.
  • the distance from the surface 14a of the flange 14 in the first direction X1 to the surface 20a of the sealing member 20 in the second direction X2 (hereinafter referred to as the insertion amount of the sealing member 20) is a.
  • the relationship between the separation distance X and the insertion amount a is expressed by the following equation (1).
  • the sealing member 20 will not come out from the opening 13 and the seal will not be opened Not done. That is, even if the internal pressure of the metal case 10 increases significantly, the opening 13 will not be opened.
  • the sealing member 20 comes off from the opening 13. Therefore, an increase in the internal pressure of the metal case 10 can be reliably suppressed.
  • the distance from the surface 14a of the flange 14 to the end surface 42a of the outer peripheral wall 42 in the second direction X2 (hereinafter referred to as the outer peripheral wall length) is Y. Further, the relationship between the outer circumferential wall length Y and the separation distance X is expressed by the following equation (2).
  • the metal case 10 does not come off from the outer peripheral wall part 42 of the resin part 40. That is, the opening 13 of the metal case 10 is arranged within the outer peripheral wall 42. Therefore, the electrolytic solution 3 and gas inside the metal case 10 do not leak to the outside of the outer peripheral wall 42.
  • case length the distance from the surface 14a of the flange portion 14 to the surface 12a of the bottom portion 12.
  • the relationship between the outer circumferential wall length Y and the case length b is expressed by the following equation (3).
  • the present disclosure is not limited to the example shown in Embodiment 1.
  • the present disclosure may be a secondary battery housing member that does not satisfy Expression (3). This is because if the resin portion attached to the surface 12a of the bottom portion 12 is thin, it will not hinder movement of the metal case 10 in the second direction X2. That is, in the present disclosure, in order to suppress the metal case 10 from moving in the second direction It may also be a secondary battery housing member.
  • the regulating member 50 of this embodiment is fixed to the housing member 60, in the present disclosure, for example, the regulating member may be press-fitted into the inner peripheral side of a cylindrical housing member.
  • the regulating member when the metal case comes into contact with the regulating member, although the regulating member moves somewhat, the metal case is prevented from moving significantly in the second direction X2. In other words, the regulating member only needs to be able to prevent movement of the metal case, and there is no particular restriction on the method of fixing the regulating member.
  • the present disclosure does not need to satisfy formula (1) or formula (2). This is because even with such a secondary battery accommodating member, the metal case 10 moves in the second direction X2, and the problem of an increase in the internal pressure of the metal case 10 can be solved. Furthermore, the present disclosure is not limited to cases where the bottom of the metal case has a small diameter. Next, other embodiments will be described. The following description focuses on the differences from the previously described embodiment.
  • FIG. 8 is a cross-sectional view taken along the center line of the secondary battery housing member of the second embodiment, and more specifically, a cross-sectional view taken along the line VIII-VIII in FIG. 10.
  • FIG. 9 is a cross-sectional view taken along the centerline direction of the secondary battery housing member of the second embodiment, and more specifically, a cross-sectional view taken along line IX-IX in FIG. 10.
  • FIG. 10 is a sectional view taken along line XX in FIG. 8.
  • FIG. 11 is a cross-sectional view of the secondary battery housing member of Embodiment 2 in a state where the metal case has moved in the second direction and is in contact with the regulating member.
  • the secondary battery housing member 100A of the second embodiment differs from the first embodiment in that the substrate 30 extends in the center line direction.
  • one surface 30a of the substrate 30 is in contact with the outer circumferential surface 10a of the metal case 10.
  • the resin portion 40 wraps around toward the back surface 30b of the substrate 30 and has a cylindrical shape. The resin portion 40 is welded to the inner surface 60a of the housing member 60, and fixes the substrate 30 and the metal case 10 (secondary battery 1).
  • the outer peripheral wall part 42 of the resin part 40 does not cover the entire circumference of the outer peripheral surface 10a of the metal case 10. That is, the outer peripheral wall portion 42 of the second embodiment is partially cut out and has a C-shape in cross-sectional view. The substrate 30 then closes the cutout portion of the outer peripheral wall portion 42. As described above, in the second embodiment, the outer peripheral side of the metal case 10 is surrounded by the outer peripheral wall portion 42 and the substrate 30.
  • the end surface 30c of the substrate 30 in the second direction X2 is arranged further in the second direction X2 than the bottom 12 of the metal case 10.
  • a regulating member 50 is fixed to the end of the substrate 30 in the second direction X2.
  • the metal case 10 moves in the second direction X2 while being guided by the outer peripheral wall 42 and the substrate 30. Thereby, the volume of the metal case 10 increases, and an increase in internal pressure is suppressed. Further, as shown in FIG. 11, the metal case 10 contacts the regulating member 50. Therefore, large movement of the metal case 10 is avoided. Further, the opening 13 of the metal case 10 is surrounded by the outer peripheral wall 42 and the substrate 30, so that the electrolyte 3 does not scatter. From the above, even in the second embodiment, the same effects as in the first embodiment can be achieved.
  • the outer peripheral wall portion of the present disclosure is not limited to a cylindrical shape as shown in Embodiment 1. That is, as described in Embodiment 2, the outer peripheral wall of the present disclosure may cooperate with the substrate to form a cylindrical shape.
  • FIG. 12 is a cross-sectional view of the secondary battery housing member of Embodiment 3 taken along the center line.
  • the secondary battery housing member 100B of the third embodiment is similar to the second embodiment in that the substrate 30 extends in the center line direction.
  • the secondary battery housing member 100B of the third embodiment differs from the second embodiment in that an electronic component 50B provided on the substrate 30 is used as the regulating member 50. Furthermore, in terms of area perpendicular to the centerline direction, the electronic component 50B is smaller than the surface 12a of the bottom portion 12.
  • the regulating member of the present disclosure may have a small area perpendicular to the centerline direction, such as the electronic component 50B. That is, the size of the regulating member is not particularly limited as long as it can regulate the movement of the metal case 10.
  • FIG. 13 is a cross-sectional view of the secondary battery housing member of Embodiment 4 taken along the center line.
  • FIG. 14 is a view seen from the direction of arrow XIV in FIG. 13.
  • the secondary battery housing member 100C of the fourth embodiment is common to the second embodiment in that the substrate 30 extends in the center line direction.
  • the secondary battery housing member 100C of the fourth embodiment differs from the second embodiment in that three pin members 52 fixed to the substrate 30 constitute a regulating member 50C.
  • the regulating member of the present disclosure does not need to be composed of one component.
  • FIG. 15 is a cross-sectional view of the secondary battery housing member of Embodiment 5 taken along the center line.
  • FIG. 16 is a cross-sectional view of the secondary battery housing member of Embodiment 5 in a state where the metal case has moved in the second direction and is in contact with the regulating member.
  • a secondary battery housing member 100D according to the fifth embodiment is similar to the second embodiment in that the substrate 30 is arranged so as to extend along the centerline direction. However, the substrate 30 is different from the second embodiment in that the substrate 30 is arranged in the first direction X1 with respect to the metal case 10 and is not in contact with the substrate 30.
  • the outer circumferential wall portion 42 of the resin portion 40 of the fifth embodiment covers the entire circumference of the outer circumferential surface of the cylindrical portion 11 and has a cylindrical shape.
  • the accommodation member 60D of the fifth embodiment is different from the other embodiments in that it forms a long rod in the direction of the center line.
  • This housing member 60D is used to penetrate foods such as meat, fish, and vegetables and hold these foods. Therefore, when heating the food, there is a possibility that the secondary battery housing member 100D is also heated together.
  • the housing member 60D has a cylindrical housing member body 61 and a weight-shaped portion 62 arranged in the second direction X2 of the housing member body 61.
  • the housing member main body 61 is a part that holds food in a penetrating state.
  • the outer diameter of the weight-shaped portion 62 gradually decreases in the second direction X2.
  • the weight-shaped portion 62 has a tapered shape toward the second direction X2. Therefore, it becomes easier to penetrate the food material.
  • the housing member main body 61 has a cylindrical shape
  • the weight-shaped portion 62 has a conical shape.
  • the housing member main body 61 may have a rectangular tube shape, and the weight-shaped portion 62 may have a pyramid shape.
  • the resin part 40 is welded to the inner peripheral surface 61a of the housing member main body 61, and the substrate 30 and the metal case 10 are housed therein.
  • the inner surface 62a of the weight-shaped portion 62 has a tapered surface whose diameter gradually decreases in the second direction X2. That is, a portion of the inner surface 62a of the weight-shaped portion 62 includes a portion having the same diameter as the outer diameter of the bottom portion 12 of the metal case 10.
  • a portion of the inner surface 62a of the weight-shaped portion 62 that has the same diameter as the outer diameter of the bottom portion 12 will be referred to as a same-diameter portion 50D.
  • the corner portion 12b of the bottom portion 12 of the metal case 10 comes into contact with the same diameter portion 50D. This prevents the metal case 10 from moving significantly. Therefore, in the fifth embodiment, the same diameter portion 50D plays the role of a regulating member. Even with the secondary battery housing member 100D of the fifth embodiment, the same effects as those of the other embodiments can be achieved. Further, according to the fifth embodiment, since there is no need to separately prepare a regulating member, the number of parts can be reduced.
  • the negative electrode active material layer of the negative electrode 7 of the secondary battery 1 is a negative electrode active material layer that has excellent resistance to high temperatures and has a lithium absorption/desorption potential of 1.0 V or more with respect to the standard electrode potential of Li/Li +.
  • it contains a substance.
  • the negative electrode active material contains lithium titanium oxide (Li 4 Ti 5 O 12 ) having a spinel crystal structure and having extremely high resistance to high temperatures.
  • Example 1 Next, an example will be described.
  • the secondary battery housing member (Example) described in the embodiment was manufactured and two tests were conducted. As Examples, Example 1, Example 2, Example 3, Example 4, Example 5, Example 6, Example 7, and Example 8 were prepared. Each example is as follows.
  • Example 1 is the secondary battery housing member 100A shown in Embodiment 2. Further, the insertion amount a is 2 mm, the case length b is 12 mm, the separation distance X is 2 mm, and the outer peripheral wall length Y is 2.1 mm. Further, the regulating member 50 is a plate member having a square shape of 4 mm x 4 mm when viewed from the center line direction.
  • Embodiment 2 and Embodiment 3 are partially modified versions of Embodiment 1. Specifically, in Example 2, the outer peripheral wall length Y is changed to 12 mm. In Example 3, the separation distance X is changed to 11.9 mm.
  • Example 4 is the secondary battery housing member 100A shown in Embodiment 2.
  • the insertion amount a is 2 mm
  • the case length b is 12 mm
  • the separation distance X is 3 mm
  • the outer peripheral wall length Y is 10 mm.
  • the regulating member is a plate member having a square shape of 4 mm x 4 mm when viewed from the center line direction.
  • Embodiment 5 and subsequent embodiments differ from Embodiment 4 in that the regulating member is changed.
  • the regulating member of the fifth embodiment is an electronic component mounted on a board as shown in the third embodiment.
  • the electronic component is a cube measuring 7.3 mm x 4.3 mm x 2 mm.
  • the regulating member of Example 6 is composed of three pins, as shown in Embodiment 4.
  • the pin has an outer diameter of 0.5 mm and a length of 4 mm.
  • Example 7 is a plate member having a rectangular shape of 2 mm x 4 mm when viewed from the center line direction. Note that, when viewed from the centerline direction, the regulating member overlaps only half of the bottom of the metal case.
  • the described member of Example 8 is the accommodation member of Embodiment 5, and the same diameter portion of the weight-shaped portion constitutes a regulating member.
  • Comparative Example 1 Comparative Example 2, Comparative Example 3, Comparative Example 4, and Comparative Example 5 were prepared.
  • Each comparative example is as follows.
  • FIG. 17 is a cross-sectional view of the secondary battery housing member of Comparative Example 1 taken along the centerline direction.
  • FIG. 18 is a view seen from the direction of arrow XVIII in FIG. 17.
  • the secondary battery housing member 200 of Comparative Example 1 includes a secondary battery 201 (electrode assembly 202, metal case 210, sealing member 220, lead 231) and a substrate 230. There is. Therefore, the secondary battery housing member 200 differs from Example 1 in that it does not include the resin portion 40, the regulating member 50, and the housing member 60.
  • the insertion amount a is 2 mm
  • the case length b is 12 mm, which are common to Example 1.
  • a thin wall portion (explosion-proof valve) 213a is provided on the surface 213 of the bottom portion 212 of the metal case 210 in the second direction X2.
  • the secondary battery housing member of Comparative Example 2 has the same configuration as the secondary battery housing member 200 of Comparative Example 1. That is, the secondary battery housing member of Comparative Example 2 includes a secondary battery 201 (electrode assembly 202, metal case 210, sealing member 220, lead 231) and a substrate 230 (see FIG. 17). .
  • Comparative Example 2 differs from Comparative Example 1 in that the thin portion 213a is not provided. Therefore, in Comparative Example 2, the bottom surface of the metal case in the second direction is a flat surface.
  • FIG. 19 is a cross-sectional view of the secondary battery housing member of Comparative Example 3 taken along the centerline direction.
  • the secondary battery housing member 200C of Comparative Example 3 is similar to Comparative Example 2 in that a thin wall portion (explosion-proof valve) 213a is not provided.
  • the secondary battery housing member 200C of Comparative Example 3 differs from Comparative Example 2 in that it includes a resin portion 240.
  • the resin part 240 is the same as the resin part 40 shown in Embodiment 2 (same as the resin part in Example 1), and has a resin sealing part 241 and an outer peripheral wall part 242.
  • the length Y of the outer peripheral wall portion is 10 mm, and the outer peripheral wall portion 242 is shorter than the case length X (12 mm).
  • FIG. 20 is a cross-sectional view of the secondary battery housing member of Comparative Example 4 taken along the centerline direction.
  • the secondary battery housing member 200D of Comparative Example 4 differs from Comparative Example 3 in that the resin portion 240 covers the surface 213 of the bottom portion 212. That is, the outer peripheral wall portion 242 has a covering portion 243 that is disposed in the second direction X2 with respect to the bottom surface 213.
  • the length Y of the outer peripheral wall portion of the outer peripheral wall portion 242 including the covering portion 243 is 14 mm. Therefore, the outer peripheral wall length Y is longer than the case length X (12 mm), and this is an example in which the formula (3) is not satisfied.
  • FIG. 21 is a cross-sectional view of the secondary battery housing member of Comparative Example 5 taken along the centerline direction.
  • a secondary battery housing member 200E of Comparative Example 5 differs from Comparative Example 2 in that it includes a regulating member 250.
  • the secondary battery housing member 200E is different from other comparative examples in that it does not have a resin portion.
  • Test 1 In Test 1, 10 pieces of each Example and each Comparative Example were prepared. Next, an overvoltage was applied to the electrode assemblies of each example and each comparative example to increase the internal pressure of the metal case, causing the metal case to move significantly. Then, we checked the condition of the metal case. The confirmed results are shown in Table 1 below.
  • evaluation result 1 in Table 1 is a confirmation result regarding the mobility of the metal case.
  • Table 1 the case where the metal case moves in the second direction and comes into contact with the regulating member and stops is marked as "O".
  • a case where the metal case did not move in the second direction or a case where it moved significantly is marked as " ⁇ ".
  • Evaluation result 2 is a confirmation result regarding damage to the metal case.
  • the case where the metal case is not damaged and the electrolyte is not scattered is rated as “ ⁇ ”.
  • a case where the metal case is damaged or a case where the metal case is not damaged but the electrolyte is scattered is marked as "x”.
  • Comparative Example 1 the metal case did not move in the second direction X2. In three out of ten, the opening side of the metal case was damaged. Therefore, the electrolyte was also scattered. In addition, in the remaining seven valves, the thin wall portion (explosion-proof valve) 213a was ruptured, and the electrolyte was also scattered.
  • Comparative Example 4 the resin part wrapped around the bottom 12 of the metal case 10, and the metal case did not move.
  • the metal case was damaged after the internal pressure exceeded a predetermined value.
  • the resin part was also damaged and the electrolyte was scattered.
  • Comparative Example 5 did not have a resin part, the metal case did not come into contact with the regulating member and moved largely in the second direction X2. Then, the electrolyte was scattered from the opening of the metal case. From the above, Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, and Comparative Example 5, which do not have a resin part or a regulating member, suppress the large movement of the metal case, avoid damage to the metal case, The electrolyte did not meet all of the requirements for scattering prevention, and no improvement in safety could be confirmed.
  • Test 2 In Test 2, 30 pieces of each Example and each Comparative Example were prepared. Then, the secondary batteries of each Example and each Comparative Example were fully charged and left in an environment of 60° C. and 90% RH for 28 days. Thereafter, the batteries of each Example and each Comparative Example were discharged. In addition, during discharge, the capacity recovery rate was determined from the discharge capacity. The capacity recovery rate (%) is the ratio of the discharge capacity after storage to the discharge capacity before storage in the environment. Table 2 shows the results of the capacity recovery rate. Note that the capacity recovery rates shown in Table 2 are the average values of 30 samples.
  • Example 2 Example 3, Example 4, Example 5, Example 6, Example 7, Example 8, Comparative Example 3, and Comparison where the outer peripheral wall length Y is 10 mm or more
  • the recovery capacity rate was 94% or more, and the moisture resistance was highly reliable.
  • the length Y of the outer peripheral wall portion was 2.1 mm, and the recovery capacity rate was 89.7%.
  • the recovery capacity rates of Comparative Example 1, Comparative Example 2, and Comparative Example 5, which do not have a resin part, are 86.1%, 86.5%, and 85.9%, indicating that Example 1 has a better result. became. From the above, it was found that moisture resistance is highly reliable when the outer peripheral wall is included.
  • the present disclosure may be a combination of the following configurations.
  • the metal case is a cylindrical portion having a cylindrical shape and having the opening at the end in the first direction; a bottom portion that closes the second direction of the cylindrical portion; has The resin part covers the outer peripheral side of the cylindrical part, the opening, and the sealing member, the regulating member is arranged apart from the bottom in the second direction; At least a portion of the regulating member faces the bottom portion of the secondary battery housing member.
  • the resin part is a resin sealing part that covers the opening and the sealing member from the first direction; an outer peripheral wall portion extending from the resin sealing portion in the second direction along the outer peripheral surface of the cylindrical portion and covering the outer peripheral side of the cylindrical portion; has Let the distance between the regulating member and the bottom be X, The length of the outer peripheral wall portion in the second direction starting from the end face of the metal case in the first direction is Y, The secondary battery housing member according to (1) or (2), which satisfies the following formula (5).
  • the length of the outer peripheral wall portion in the second direction starting from the end face of the metal case in the first direction is Y
  • the length from the end face in the first direction to the end face in the second direction of the metal case is b
  • (5) comprising a housing member that houses the secondary battery, the substrate, and the resin part,
  • the inner circumferential surface of the housing member has a tapered surface that gradually reduces in diameter toward the second direction
  • the secondary battery accommodating member according to any one of (1) to (4), wherein the tapered surface is arranged in the second direction with respect to the bottom portion and forms the regulating member.
  • the negative electrode active material includes lithium titanium oxide (Li 4 Ti 5 O 12 ) having a spinel crystal structure.

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  • Inorganic Chemistry (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

A secondary battery housing member according to the present disclosure comprises: a secondary battery having an electrode assembly, a metal case that has an opening open in a first direction and that houses the electrode assembly inside, a sealing member that seals the opening, and a lead that is connected to the electrode assembly; a substrate connected to the lead; a resin part welded to the substrate; and a regulating member disposed in a second direction with respect to the metal case. The metal case is provided with a cylinder part with an opening provided on an end part in the first direction, and a bottom part that closes the second direction of the cylinder part. The resin part covers the cylinder part outer circumference side, the opening, and the sealing member. The regulating member is disposed apart from the bottom part in the second direction, and at least a portion of the regulating member faces the bottom part.

Description

二次電池収容部材Secondary battery housing member
　本開示は、二次電池収容部材に関する。 The present disclosure relates to a secondary battery housing member.
　近年、多くの電気製品が二次電池を備えている。二次電池は基板などの周辺部品と一体化された状態で容器等に収容される。よって、二次電池と周辺部品をまとめて二次電池収容部材と呼ぶことがある。また、二次電池では、外装材として金属ケースが利用され、電極組立体が金属ケースに収容される場合がある。このような二次電池において、電極組立体が発熱すると、金属ケースの内圧が上昇する。下記特許文献１の二次電池では、金属ケースの底部に、肉薄部（防爆弁）が設けられている。金属ケースの内圧が所定値に到達した場合、肉薄部が開裂し、金属ケースの圧力が開放される。 In recent years, many electrical products are equipped with secondary batteries. The secondary battery is housed in a container or the like while being integrated with peripheral components such as a board. Therefore, the secondary battery and peripheral components may be collectively referred to as a secondary battery housing member. Further, in a secondary battery, a metal case is sometimes used as an exterior material, and an electrode assembly is housed in the metal case. In such a secondary battery, when the electrode assembly generates heat, the internal pressure of the metal case increases. In the secondary battery disclosed in Patent Document 1 below, a thin wall portion (explosion-proof valve) is provided at the bottom of the metal case. When the internal pressure of the metal case reaches a predetermined value, the thin wall portion cleaves and the pressure of the metal case is released.
特開２００３－２１７５２８号公報JP2003-217528A
　しかしながら、金属ケースの底部が小径の場合、金属ケースの内圧が所定値に到達しても肉薄部が開裂しないことがある。つまり、内圧が所定値に到達した場合に開裂する肉薄部（防爆弁）を形成することが難しい。よって、肉薄部（防爆弁）を形成することなく、金属ケースの内圧の上昇を抑制できることが望まれている。 However, if the bottom of the metal case has a small diameter, the thin wall portion may not rupture even if the internal pressure of the metal case reaches a predetermined value. In other words, it is difficult to form a thin wall portion (explosion-proof valve) that ruptures when the internal pressure reaches a predetermined value. Therefore, it is desired to be able to suppress the increase in internal pressure of the metal case without forming a thin wall portion (explosion proof valve).
　上記課題に鑑み、本開示は、金属ケースの内圧の上昇を抑制できる二次電池収容部材を提供することを目的とする。 In view of the above problems, an object of the present disclosure is to provide a secondary battery housing member that can suppress an increase in internal pressure of a metal case.
　本開示の一態様の二次電池収容部材は、電極組立体と、第１方向に開口する開口部を有し、内部に前記電極組立体を収容する金属ケースと、前記開口部に挿入され、前記開口部を封止する封止部材と、前記封止部材を貫通して前記電極組立体と接続されたリードと、を有する二次電池と、前記リードに接続された基板と、前記基板に溶着された樹脂部と、前記金属ケースに対し、前記第１方向と反対の第２方向に配置された規制部材と、を有している。前記金属ケースは、筒状を成し、前記第１方向の端部に前記開口部が設けられている筒部と、前記筒部の前記第２方向を閉塞する底部と、を有している。前記樹脂部は、前記筒部の外周側、前記開口部、および前記封止部材を覆っている。前記規制部材は、前記底部に対し前記第２方向に離れて配置されている。前記規制部材の少なくとも一部は、前記底部と対向している。 A secondary battery accommodating member according to an aspect of the present disclosure includes an electrode assembly, a metal case having an opening opening in a first direction and accommodating the electrode assembly therein, and being inserted into the opening, A secondary battery having a sealing member that seals the opening, a lead that penetrates the sealing member and is connected to the electrode assembly, a substrate connected to the lead, and a secondary battery that is connected to the electrode assembly. It has a welded resin part and a regulating member arranged in a second direction opposite to the first direction with respect to the metal case. The metal case has a cylindrical shape, and includes a cylindrical portion in which the opening is provided at an end in the first direction, and a bottom portion that closes the second direction of the cylindrical portion. . The resin portion covers the outer peripheral side of the cylindrical portion, the opening, and the sealing member. The regulating member is arranged apart from the bottom in the second direction. At least a portion of the regulating member faces the bottom portion.
　本開示の二次電池収容部材によれば、金属ケースの内圧が所定値に到達すると、金属ケースが第２方向に移動する。よって、金属ケース内の容積が増加し、内圧の上昇が抑制される。また、金属ケースは規制部材に接触するため、大きく移動しない。 According to the secondary battery housing member of the present disclosure, when the internal pressure of the metal case reaches a predetermined value, the metal case moves in the second direction. Therefore, the volume inside the metal case increases, and an increase in internal pressure is suppressed. Furthermore, since the metal case contacts the regulating member, it does not move significantly.
図１は、実施形態１の二次電池収容部材を巻回中心に沿って切った断面図である。FIG. 1 is a cross-sectional view of the secondary battery housing member of Embodiment 1 taken along the winding center. 図２は、二次電池の拡大図である。FIG. 2 is an enlarged view of the secondary battery. 図３は、図１のＩＩＩ－ＩＩＩ線矢視断面図である。FIG. 3 is a sectional view taken along the line III-III in FIG. 図４は、図１の矢印ＩＶの方向から見た図である。FIG. 4 is a view seen from the direction of arrow IV in FIG. 図５は、実施形態１の二次電池収容部材において金属ケースが第２方向に移動した状態を示す断面図である。FIG. 5 is a cross-sectional view showing a state in which the metal case has moved in the second direction in the secondary battery housing member of Embodiment 1. 図６は、実施形態１の二次電池収容部材において金属ケースが第２方向に移動し、規制部材に接触した状態を示す断面図である。FIG. 6 is a cross-sectional view showing a state in which the metal case moves in the second direction and comes into contact with the regulating member in the secondary battery housing member of Embodiment 1. 図７は、実施形態１の二次電池収容部材を巻回中心に沿って切った断面図である。FIG. 7 is a cross-sectional view of the secondary battery housing member of Embodiment 1 taken along the winding center. 図８は、実施形態２の二次電池収容部材を中心線方向に切った断面図であり、詳細には、図１０のＶＩＩＩ－ＶＩＩＩ線の矢視断面図である。FIG. 8 is a cross-sectional view taken along the center line of the secondary battery housing member of the second embodiment, and more specifically, a cross-sectional view taken along the line VIII-VIII in FIG. 10. 図９は、実施形態２の二次電池収容部材を中心線方向に切った断面図であり、詳細には、図１０のＩＸ－ＩＸ線の矢視断面図である。FIG. 9 is a cross-sectional view taken along the centerline direction of the secondary battery housing member of the second embodiment, and more specifically, a cross-sectional view taken along line IX-IX in FIG. 10. 図１０は、図８のＸ－Ｘ線の矢視断面図である。FIG. 10 is a sectional view taken along line XX in FIG. 8. 図１１は、実施形態２の二次電池収容部材であって、金属ケースが第２方向に移動し、規制部材に接触した状態の断面図である。FIG. 11 is a cross-sectional view of the secondary battery housing member of Embodiment 2 in a state where the metal case has moved in the second direction and is in contact with the regulating member. 図１２は、実施形態３の二次電池収容部材を中心線に沿って切った断面図である。FIG. 12 is a cross-sectional view of the secondary battery housing member of Embodiment 3 taken along the center line. 図１３は、実施形態４の二次電池収容部材を中心線に沿って切った断面図である。FIG. 13 is a cross-sectional view of the secondary battery housing member of Embodiment 4 taken along the center line. 図１４は、図１３の矢印ＸＩＶの方向から視た図である。FIG. 14 is a view seen from the direction of arrow XIV in FIG. 13. 図１５は、実施形態５の二次電池収容部材を中心線に沿って切った断面図である。FIG. 15 is a cross-sectional view of the secondary battery housing member of Embodiment 5 taken along the center line. 図１６は、実施形態５の二次電池収容部材であって、金属ケースが第２方向に移動し、規制部材に接触した状態の断面図である。FIG. 16 is a cross-sectional view of the secondary battery housing member of Embodiment 5 in a state where the metal case has moved in the second direction and is in contact with the regulating member. 図１７は、比較例１の二次電池収容部材を中心線方向に沿って切った断面図である。FIG. 17 is a cross-sectional view of the secondary battery housing member of Comparative Example 1 taken along the centerline direction. 図１８は、図１７の矢印ＸＶＩＩＩ方向から視た図である。FIG. 18 is a view seen from the direction of arrow XVIII in FIG. 17. 図１９は、比較例３の二次電池収容部材を中心線方向に沿って切った断面図である。FIG. 19 is a cross-sectional view of the secondary battery housing member of Comparative Example 3 taken along the centerline direction. 図２０は、比較例４の二次電池収容部材を中心線方向に沿って切った断面図である。FIG. 20 is a cross-sectional view of the secondary battery housing member of Comparative Example 4 taken along the centerline direction. 図２１は、比較例５の二次電池収容部材を中心線方向に沿って切った断面図である。FIG. 21 is a cross-sectional view of the secondary battery housing member of Comparative Example 5 taken along the centerline direction.
　以下、本開示につき図面を参照しつつ詳細に説明する。なお、下記の発明を実施するための形態（以下、実施形態という）により本開示が限定されるものではない。また、下記実施形態における構成要素には、当業者が容易に想定できるもの、実質的に同一のもの、いわゆる均等の範囲のものが含まれる。さらに、下記実施形態で開示した構成要素は適宜組み合わせることが可能である。 Hereinafter, the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the following detailed description of the invention (hereinafter referred to as embodiment). Furthermore, the constituent elements in the embodiments below include those that can be easily imagined by those skilled in the art, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the components disclosed in the embodiments below can be combined as appropriate.
（実施形態１）
　図１は、実施形態１の二次電池収容部材を巻回中心に沿って切った断面図である。図１に示すように、二次電池収容部材１００は、二次電池１と、基板３０と、樹脂部４０と、規制部材５０と、収容部材６０と、を備えている。 (Embodiment 1)
FIG. 1 is a cross-sectional view of the secondary battery housing member of Embodiment 1 taken along the winding center. As shown in FIG. 1, the secondary battery housing member 100 includes a secondary battery 1, a substrate 30, a resin portion 40, a regulating member 50, and a housing member 60.
　図２は、二次電池の拡大図である。図２に示すように、二次電池１は、例えばリチウムイオン２次電池であり、電極組立体２と、金属ケース１０と、封止部材２０と、２つのリード３１と、を備えている。また、電極組立体２は、巻回体４と、巻回体４から延出する２つのタブ５と、を備えている。巻回体４は、正極６と負極７とセパレーター８を備えている。 FIG. 2 is an enlarged view of the secondary battery. As shown in FIG. 2, the secondary battery 1 is, for example, a lithium ion secondary battery, and includes an electrode assembly 2, a metal case 10, a sealing member 20, and two leads 31. Further, the electrode assembly 2 includes a wound body 4 and two tabs 5 extending from the wound body 4. The wound body 4 includes a positive electrode 6, a negative electrode 7, and a separator 8.
　正極６は、正極集電体と、正極集電体の両面に配置された正極活物質層と、を有している。正極集電体は、例えば、アルミニウムなどの導電性材料の薄膜である。正極活物質層は、リチウムイオン二次電池における正極の形成で採用される複数の材料（正極材料）の混合物を薄膜状に形成したものである。正極材料は、例えば正極活物質、結着剤、導電材を含んでいる。 The positive electrode 6 includes a positive electrode current collector and positive electrode active material layers disposed on both sides of the positive electrode current collector. The positive electrode current collector is, for example, a thin film of a conductive material such as aluminum. The positive electrode active material layer is a thin film formed from a mixture of a plurality of materials (positive electrode materials) used in forming a positive electrode in a lithium ion secondary battery. The positive electrode material includes, for example, a positive electrode active material, a binder, and a conductive material.
　負極７は、負極集電体と、負極集電体の両面に配置された負極活物質層と、を有している。負極集電体は、例えば、アルミニウム、銅、ニッケルおよびステンレス鋼などの導電性材料の薄膜である。負極活物質層は、リチウムイオン二次電池における負極の形成で採用される複数の材料（負極材料）の混合物を薄膜状に形成したものである。負極材料は、例えば負極活物質、結着剤、導電材及び増粘剤を含んでいる。 The negative electrode 7 includes a negative electrode current collector and negative electrode active material layers disposed on both sides of the negative electrode current collector. The negative electrode current collector is a thin film of conductive material such as aluminum, copper, nickel, and stainless steel, for example. The negative electrode active material layer is a thin film formed from a mixture of a plurality of materials (negative electrode materials) used in forming the negative electrode in a lithium ion secondary battery. The negative electrode material includes, for example, a negative electrode active material, a binder, a conductive material, and a thickener.
　正極６と負極７とセパレーター８は、帯状を成している。正極６、セパレーター８、負極７、セパレーター８の順に積層し、その積層した積層体を巻回することで巻回体４が製造される。また、巻回体４の外周面には、保護テープ９が接着されている。以下、正極６と負極７とセパレーター８のそれぞれが巻回された中心を巻回中心Ｏ（図２を参照）と称する。また、巻回中心Ｏと平行な方向を中心線方向と称する。 The positive electrode 6, the negative electrode 7, and the separator 8 form a band shape. The wound body 4 is manufactured by laminating the positive electrode 6, separator 8, negative electrode 7, and separator 8 in this order, and winding the laminated body. Further, a protective tape 9 is adhered to the outer peripheral surface of the wound body 4. Hereinafter, the center around which each of the positive electrode 6, the negative electrode 7, and the separator 8 is wound will be referred to as a winding center O (see FIG. 2). Further, a direction parallel to the winding center O is referred to as a centerline direction.
　２つのタブ５は、一方が正極６の正極集電体に接合し、他方が負極７の負極集電体に接合している。２つのタブ５は、巻回体４から中心線方向の一方に突出している。以下、中心線方向のうち、タブ５が突出している方向を第１方向Ｘ１と称し、反対方向を第２方向Ｘ２と称する。そして、２つのタブ５の第１方向Ｘ１の端部は、リード３１に溶接されている。 One of the two tabs 5 is connected to the positive electrode current collector of the positive electrode 6, and the other is connected to the negative electrode current collector of the negative electrode 7. The two tabs 5 protrude from the wound body 4 in one direction in the centerline direction. Hereinafter, among the centerline directions, the direction in which the tab 5 protrudes will be referred to as a first direction X1, and the opposite direction will be referred to as a second direction X2. The ends of the two tabs 5 in the first direction X1 are welded to the lead 31.
　また、金属ケース１０には、電解液３が封入されている。電解液３は、正極６、負極７およびセパレーター８のそれぞれに含浸されている。 Furthermore, an electrolytic solution 3 is sealed in the metal case 10. Electrolyte solution 3 is impregnated into each of positive electrode 6, negative electrode 7, and separator 8.
　金属ケース１０は、第１方向Ｘ１に開口する有底筒状の部品である。つまり、金属ケース１０は、巻回中心Ｏに中心に筒状を成す筒部１１と、筒部１１の第２方向Ｘ２を閉塞する底部１２と、を有している。 The metal case 10 is a cylindrical component with a bottom that opens in the first direction X1. That is, the metal case 10 has a cylindrical portion 11 having a cylindrical shape centered on the winding center O, and a bottom portion 12 that closes off the second direction X2 of the cylindrical portion 11.
　図３は、図１のＩＩＩ－ＩＩＩ線矢視断面図である。図３に示すように、筒部１１の断面形状は、電極組立体２の外周の形状に対応し、円形状となっている。つまり、筒部１１は、円筒状を成している。図２に示すように、筒部１１の第１方向Ｘ１の端部には、開口部１３が設けられている。この開口部１３に封止部材２０が挿入されている。 FIG. 3 is a sectional view taken along the line III-III in FIG. 1. As shown in FIG. 3, the cross-sectional shape of the cylindrical portion 11 corresponds to the shape of the outer periphery of the electrode assembly 2, and is circular. That is, the cylindrical portion 11 has a cylindrical shape. As shown in FIG. 2, an opening 13 is provided at the end of the cylindrical portion 11 in the first direction X1. A sealing member 20 is inserted into this opening 13.
　封止部材２０は、例えばゴムなどの弾性材料で製造されている。封止部材２０は、筒部１１の内周面に嵌合し、開口部１３を封止している。また、封止部材２０には、２つの貫通孔２１が設けられており、配線（タブ５、リード３１）が貫通している。 The sealing member 20 is made of an elastic material such as rubber. The sealing member 20 fits into the inner peripheral surface of the cylindrical portion 11 and seals the opening 13. Furthermore, the sealing member 20 is provided with two through holes 21 through which the wiring (tab 5, lead 31) passes.
　筒部１１の第１方向Ｘ１の端部は、開口部１３の方に折り曲げられた（加締められた）鍔部１４が設けられている。これにより、開口部１３から封止部材２０が抜け難くなっている。また、筒部１１の第１方向ｘ１の端寄りには、内側に窪ませて成る凸部１５が設けられている。この凸部１５は、周方向に延在している。凸部１５は、封止部材２０の外周面を押圧し、封止部材２０が弾性変形している。これにより、封止部材２０と筒部１１の内周面との間に隙間が発生し難く、封止性能が向上している。 At the end of the cylindrical portion 11 in the first direction X1, a flange portion 14 that is bent toward the opening 13 (crimped) is provided. This makes it difficult for the sealing member 20 to come off from the opening 13. Furthermore, a convex portion 15 that is recessed inward is provided near the end of the cylindrical portion 11 in the first direction x1. This convex portion 15 extends in the circumferential direction. The convex portion 15 presses the outer peripheral surface of the sealing member 20, causing the sealing member 20 to be elastically deformed. Thereby, a gap is less likely to occur between the sealing member 20 and the inner circumferential surface of the cylindrical portion 11, and sealing performance is improved.
　図４は、図１の矢印ＩＶの方向から見た図である。図４に示すように、底部１２は、円形状を成している。底部１２の第２方向Ｘ２の面１２ａは、平面となっている。つまり、底部１２には、切り込みなどの薄肉部が設けられていない。よって、底部１２は、防爆弁の機能を有していない。 FIG. 4 is a view seen from the direction of arrow IV in FIG. 1. As shown in FIG. 4, the bottom portion 12 has a circular shape. A surface 12a of the bottom portion 12 in the second direction X2 is a flat surface. That is, the bottom portion 12 is not provided with a thin portion such as a cut. Therefore, the bottom portion 12 does not have the function of an explosion-proof valve.
　図１に示すように、基板３０は、電極組立体２の過放電や過充電を抑制するための制御基板である。基板３０は、二次電池１の２つのリード３１に接続している。基板３０は、中心線方向に対し直交するように延在し、収容部材６０に固定されている。また、基板３０は、金属ケース１０の第１方向Ｘ１に配置され、開口部１３と対向している。 As shown in FIG. 1, the board 30 is a control board for suppressing over-discharging and over-charging of the electrode assembly 2. The substrate 30 is connected to two leads 31 of the secondary battery 1. The substrate 30 extends perpendicularly to the centerline direction and is fixed to the housing member 60. Further, the substrate 30 is arranged in the first direction X1 of the metal case 10 and faces the opening 13.
　樹脂部４０は、開口部１３と基板３０との間に設けられた樹脂封止部４１と、樹脂封止部４１の第２方向Ｘ２に配置された外周壁部４２と、を備えている。外周壁部４２と樹脂封止部４１は、射出成型法で一体的に形成されている。なお、本開示は、射出成型法以外の製造方法により製造された樹脂部４０であってもよい。 The resin part 40 includes a resin sealing part 41 provided between the opening 13 and the substrate 30, and an outer peripheral wall part 42 disposed in the second direction X2 of the resin sealing part 41. The outer peripheral wall portion 42 and the resin sealing portion 41 are integrally formed by injection molding. Note that the resin part 40 of the present disclosure may be manufactured by a manufacturing method other than the injection molding method.
　樹脂封止部４１は、封止部材２０及び鍔部１４に対し第１方向Ｘ１から溶着している。これにより、液体又は湿気が金属ケース１０の内部に侵入し難い。また、樹脂封止部４１は、基板３０に溶着している。よって、樹脂部４０は、基板３０と一体になっている。 The resin sealing part 41 is welded to the sealing member 20 and the collar part 14 from the first direction X1. This makes it difficult for liquid or moisture to enter the inside of the metal case 10. Further, the resin sealing part 41 is welded to the substrate 30. Therefore, the resin portion 40 is integrated with the substrate 30.
　外周壁部４２は、樹脂封止部４１から第２方向Ｘ２に延びている。詳細には、外周壁部４２は、鍔部１４の第１方向Ｘ１の面１４ａを起点として、第２方向Ｘ２に延びている部分である。言い換えると、外周壁部４２は、樹脂部４０のうち、面１４ａを含む面から金属ケース１０の筒部１１の外周面に沿って第２方向Ｘ２に延びている部分である。外周壁部４２は、環状（円筒形状）を成している（図３、図４参照）。この外周壁部４２によれば、収容部材６０内の液体又は湿気が金属ケース１０の開口部１３の方に移動し難くなる。よって、金属ケース１０の封止性能が大きく向上している。 The outer peripheral wall portion 42 extends from the resin sealing portion 41 in the second direction X2. Specifically, the outer peripheral wall portion 42 is a portion extending in the second direction X2 from the surface 14a of the collar portion 14 in the first direction X1. In other words, the outer peripheral wall portion 42 is a portion of the resin portion 40 that extends in the second direction X2 along the outer peripheral surface of the cylindrical portion 11 of the metal case 10 from the surface including the surface 14a. The outer peripheral wall portion 42 has an annular (cylindrical) shape (see FIGS. 3 and 4). According to this outer peripheral wall portion 42, the liquid or moisture within the housing member 60 becomes difficult to move toward the opening 13 of the metal case 10. Therefore, the sealing performance of the metal case 10 is greatly improved.
　外周壁部４２の第２方向Ｘ２の端面４２ａは、金属ケース１０の底部１２よりも第１方向Ｘ１に位置している。また、外周壁部４２は、金属ケース１０の外周面に溶着している。樹脂部４０の溶着強度に関し、外周壁部４２と金属ケース１０との溶着強度よりも、樹脂封止部４１と基板３０との溶着強度の方が高い。よって、金属ケース１０の内圧が上昇し、金属ケース１０に第２方向Ｘ２への荷重が作用した場合、樹脂部４０は、基板３０と溶着が維持され、金属ケース１０のみが第２方向Ｘ２へ移動する。つまり、樹脂部４０は、金属ケース１０とともに第２方向Ｘ２に移動しない。 The end surface 42a of the outer peripheral wall portion 42 in the second direction X2 is located further in the first direction X1 than the bottom portion 12 of the metal case 10. Further, the outer peripheral wall portion 42 is welded to the outer peripheral surface of the metal case 10. Regarding the welding strength of the resin part 40, the welding strength between the resin sealing part 41 and the substrate 30 is higher than the welding strength between the outer peripheral wall part 42 and the metal case 10. Therefore, when the internal pressure of the metal case 10 increases and a load acts on the metal case 10 in the second direction X2, the resin part 40 remains welded to the substrate 30, and only the metal case 10 moves in the second direction X2. Moving. That is, the resin part 40 does not move in the second direction X2 together with the metal case 10.
　規制部材５０は、収容部材６０に固定された断面視でＬ字状の部材である。規制部材５０は、底部１２に対し第２方向Ｘ２に離隔して配置されている。また、図４に示すように、規制部材５０は、底部１２に対し、中心線方向に配置されている。つまり、規制部材５０は、底部１２と対向しており、金属ケース１０が第２方向Ｘ２に移動した場合、底部１２と接触可能となっている。なお、本開示は、規制部材５０の全てが底部１２と対向している必要がなく、規制部材５０の少なくとも一部が底部１２と対向していればよい。 The regulating member 50 is an L-shaped member fixed to the housing member 60 in cross-sectional view. The regulating member 50 is spaced apart from the bottom portion 12 in the second direction X2. Moreover, as shown in FIG. 4, the regulating member 50 is arranged in the centerline direction with respect to the bottom part 12. That is, the regulating member 50 faces the bottom 12 and can come into contact with the bottom 12 when the metal case 10 moves in the second direction X2. Note that in the present disclosure, all of the regulating members 50 do not need to face the bottom 12, and at least a portion of the regulating members 50 only needs to face the bottom 12.
　図５は、実施形態１の二次電池収容部材において金属ケースが第２方向に移動した状態を示す断面図である。以上、実施形態１の二次電池収容部材１００によれば、二次電池１が発熱すると、金属ケース１０の内圧が上昇する。この結果、封止部材２０に第１方向Ｘ１への荷重が作用し、金属ケース１０には第２方向Ｘ２への荷重が作用する。封止部材２０は、樹脂封止部４１及び基板３０に支持され、第１方向Ｘ１に移動しない。よって、図５に示すように、封止部材２０の位置は変わらず、一方で、金属ケース１０が第２方向Ｘ２に移動する。これにより、金属ケース１０の容積が実質的に増加し、金属ケース１０の内圧の上昇が抑制される。 FIG. 5 is a cross-sectional view showing a state in which the metal case has moved in the second direction in the secondary battery housing member of Embodiment 1. As described above, according to the secondary battery housing member 100 of the first embodiment, when the secondary battery 1 generates heat, the internal pressure of the metal case 10 increases. As a result, a load acts on the sealing member 20 in the first direction X1, and a load acts on the metal case 10 in the second direction X2. The sealing member 20 is supported by the resin sealing part 41 and the substrate 30 and does not move in the first direction X1. Therefore, as shown in FIG. 5, the position of the sealing member 20 does not change, while the metal case 10 moves in the second direction X2. Thereby, the volume of the metal case 10 is substantially increased, and an increase in the internal pressure of the metal case 10 is suppressed.
　図６は、実施形態１の二次電池収容部材において金属ケースが第２方向に移動し、規制部材に接触した状態を示す断面図である。また、金属ケース１０の内圧の上昇量が大きい場合、金属ケース１０が第２方向Ｘ２に大きく移動する。そして、金属ケース１０の底部１２の面１２ａが規制部材５０の第１方向Ｘ１の面５１に接触する。これにより、金属ケース１０の移動が停止する。なお、金属ケース１０は、外周壁部４２に沿って移動する。よって、金属ケース１０は、確実に規制部材５０に接触する。 FIG. 6 is a cross-sectional view showing a state in which the metal case moves in the second direction and comes into contact with the regulating member in the secondary battery housing member of Embodiment 1. Further, when the amount of increase in the internal pressure of the metal case 10 is large, the metal case 10 moves significantly in the second direction X2. Then, the surface 12a of the bottom portion 12 of the metal case 10 contacts the surface 51 of the regulating member 50 in the first direction X1. As a result, the movement of the metal case 10 is stopped. Note that the metal case 10 moves along the outer peripheral wall portion 42. Therefore, the metal case 10 reliably contacts the regulating member 50.
　以上から、金属ケース１０が第２方向Ｘ２に大きく移動する、ということが回避される。このため、収容部材６０や二次電池収容部材１００を内蔵する機器の破損を回避できる。 From the above, it is avoided that the metal case 10 moves significantly in the second direction X2. Therefore, it is possible to avoid damage to the equipment incorporating the housing member 60 and the secondary battery housing member 100.
　図７は、実施形態１の二次電池収容部材を巻回中心に沿って切った断面図である。次に、実施形態１の二次電池収容部材１００の詳細について説明する。図７に示すように、実施形態１において、底部１２の面１２ａと、規制部材５０の第１方向Ｘ１の面５０ａと、の距離（以下、離間距離と称する）は、Ｘとなっている。また、鍔部１４の第１方向Ｘ１の面１４ａを起点とした封止部材２０の第２方向Ｘ２の面２０ａまでの距離（以下、封止部材２０の挿入量と称する）をａとする。そして、離間距離Ｘと挿入量ａとの関係は、以下の式（１）の関係となっている。 FIG. 7 is a cross-sectional view of the secondary battery housing member of Embodiment 1 taken along the winding center. Next, details of the secondary battery housing member 100 of Embodiment 1 will be described. As shown in FIG. 7, in the first embodiment, the distance (hereinafter referred to as separation distance) between the surface 12a of the bottom portion 12 and the surface 50a of the regulating member 50 in the first direction X1 is X. Further, the distance from the surface 14a of the flange 14 in the first direction X1 to the surface 20a of the sealing member 20 in the second direction X2 (hereinafter referred to as the insertion amount of the sealing member 20) is a. The relationship between the separation distance X and the insertion amount a is expressed by the following equation (1).
Figure JPOXMLDOC01-appb-M000004
Figure JPOXMLDOC01-appb-M000004
　仮に、離間距離Ｘが封止部材２０の挿入量ａ未満（Ｘ＜ａ）とすると、金属ケース１０が第２方向Ｘ２へ移動しても、開口部１３から封止部材２０が抜けず、開封されない。つまり、金属ケース１０の内圧が大きく上昇した場合にも、開口部１３が開封されない。一方で、本実施形態によれば、図６に示すように、金属ケース１０が第２方向Ｘ２に移動した場合、開口部１３から封止部材２０が抜ける。よって、金属ケース１０の内圧の上昇を確実に抑えられる。 If the separation distance X is less than the insertion amount a of the sealing member 20 (X<a), even if the metal case 10 moves in the second direction X2, the sealing member 20 will not come out from the opening 13 and the seal will not be opened Not done. That is, even if the internal pressure of the metal case 10 increases significantly, the opening 13 will not be opened. On the other hand, according to this embodiment, as shown in FIG. 6, when the metal case 10 moves in the second direction X2, the sealing member 20 comes off from the opening 13. Therefore, an increase in the internal pressure of the metal case 10 can be reliably suppressed.
　また、図７に示すように、鍔部１４の面１４ａを起点として外周壁部４２の第２方向Ｘ２の端面４２ａまでの距離（以下、外周壁部長さと称する）は、Ｙとなっている。また、外周壁部長さＹと離間距離Ｘとの関係は、以下の式（２）の関係となっている。 Further, as shown in FIG. 7, the distance from the surface 14a of the flange 14 to the end surface 42a of the outer peripheral wall 42 in the second direction X2 (hereinafter referred to as the outer peripheral wall length) is Y. Further, the relationship between the outer circumferential wall length Y and the separation distance X is expressed by the following equation (2).
Figure JPOXMLDOC01-appb-M000005
Figure JPOXMLDOC01-appb-M000005
　これによれば、図６に示すように、金属ケース１０が第２方向Ｘ２に最も移動した場合であっても、金属ケース１０が樹脂部４０の外周壁部４２から抜けない。つまり、金属ケース１０の開口部１３は、外周壁部４２内に配置される。このため、金属ケース１０内の電解液３やガスが外周壁部４２の外部に漏れない。 According to this, as shown in FIG. 6, even when the metal case 10 moves the most in the second direction X2, the metal case 10 does not come off from the outer peripheral wall part 42 of the resin part 40. That is, the opening 13 of the metal case 10 is arranged within the outer peripheral wall 42. Therefore, the electrolytic solution 3 and gas inside the metal case 10 do not leak to the outside of the outer peripheral wall 42.
　また、図７に示すように、鍔部１４の面１４ａを起点として底部１２の面１２ａまでの距離（以下、ケース長さと称する）は、ｂとなっている。外周壁部長さＹとケース長さｂとの関係は、以下の式（３）の関係となっている。 Further, as shown in FIG. 7, the distance from the surface 14a of the flange portion 14 to the surface 12a of the bottom portion 12 (hereinafter referred to as case length) is b. The relationship between the outer circumferential wall length Y and the case length b is expressed by the following equation (3).
Figure JPOXMLDOC01-appb-M000006
Figure JPOXMLDOC01-appb-M000006
　樹脂部４０を形成する際、溶融した樹脂を金属ケース１０の外周面に付着させているが、底部１２の面１２ａを超えて第２方向Ｘ２に樹脂部４０を形成すると、樹脂が底部１２の面１２ａに付着する。そして、底部１２の面１２ａに付着した樹脂部４０は、金属ケース１０が第２方向Ｘ２に移動することを妨げてしまう。一方、本実施形態では、式（３）を満たし、樹脂部４０が底部１２の面１２ａに付着していない。このため、金属ケース１０の内圧が所定値に到達した場合、速やかに金属ケース１０が第２方向Ｘ２に移動し、内圧の上昇が抑制される。 When forming the resin part 40, molten resin is attached to the outer peripheral surface of the metal case 10, but when the resin part 40 is formed in the second direction It adheres to the surface 12a. The resin portion 40 attached to the surface 12a of the bottom portion 12 prevents the metal case 10 from moving in the second direction X2. On the other hand, in this embodiment, formula (3) is satisfied, and the resin portion 40 is not attached to the surface 12a of the bottom portion 12. Therefore, when the internal pressure of the metal case 10 reaches a predetermined value, the metal case 10 quickly moves in the second direction X2, and an increase in the internal pressure is suppressed.
　以上、実施形態１の二次電池収容部材について説明したが、本開示は、実施形態１で示した例に限定されない。例えば、本開示は、式（３）を満たしていない二次電池収容部材であってもよい。底部１２の面１２ａに付着した樹脂部が薄ければ、金属ケース１０の第２方向Ｘ２への移動を妨げないからである。つまり、本開示では、金属ケース１０の内圧が所定値に到達する前に金属ケース１０が第２方向Ｘ２に移動することを抑制するため、底部１２の面１２ａに樹脂部４０を設けられた二次電池収容部材であってもよい。なお、本実施形態の規制部材５０は収容部材６０に固定されているが、本開示は、例えば規制部材が筒状の収容部材の内周側に圧入されていてもよい。このような例であっても、金属ケースが規制部材と接触すると、規制部材が多少移動するものの、金属ケースが第２方向Ｘ２に大きく移動することを妨げられるからである。つまり、規制部材は、金属ケースの移動を妨げることができればよく、規制部材の固定方法について特に制限はない。 Although the secondary battery housing member of Embodiment 1 has been described above, the present disclosure is not limited to the example shown in Embodiment 1. For example, the present disclosure may be a secondary battery housing member that does not satisfy Expression (3). This is because if the resin portion attached to the surface 12a of the bottom portion 12 is thin, it will not hinder movement of the metal case 10 in the second direction X2. That is, in the present disclosure, in order to suppress the metal case 10 from moving in the second direction It may also be a secondary battery housing member. Note that although the regulating member 50 of this embodiment is fixed to the housing member 60, in the present disclosure, for example, the regulating member may be press-fitted into the inner peripheral side of a cylindrical housing member. Even in such an example, when the metal case comes into contact with the regulating member, although the regulating member moves somewhat, the metal case is prevented from moving significantly in the second direction X2. In other words, the regulating member only needs to be able to prevent movement of the metal case, and there is no particular restriction on the method of fixing the regulating member.
　また、本開示は、式（１）や式（２）を満たさなくてもよい。このような二次電池収容部材であっても金属ケース１０が第２方向Ｘ２に移動し、金属ケース１０の内圧上昇という課題を解決することができるからである。また、本開示は、金属ケースの底部が小径のものに限定されない。次に他の実施形態について説明する。以下、先に説明した実施形態との相違点に絞って説明する。 Furthermore, the present disclosure does not need to satisfy formula (1) or formula (2). This is because even with such a secondary battery accommodating member, the metal case 10 moves in the second direction X2, and the problem of an increase in the internal pressure of the metal case 10 can be solved. Furthermore, the present disclosure is not limited to cases where the bottom of the metal case has a small diameter. Next, other embodiments will be described. The following description focuses on the differences from the previously described embodiment.
（実施形態２）
　図８は、実施形態２の二次電池収容部材を中心線方向に切った断面図であり、詳細には、図１０のＶＩＩＩ－ＶＩＩＩ線の矢視断面図である。図９は、実施形態２の二次電池収容部材を中心線方向に切った断面図であり、詳細には、図１０のＩＸ－ＩＸ線の矢視断面図である。図１０は、図８のＸ－Ｘ線の矢視断面図である。図１１は、実施形態２の二次電池収容部材であって、金属ケースが第２方向に移動し、規制部材に接触した状態の断面図である。 (Embodiment 2)
FIG. 8 is a cross-sectional view taken along the center line of the secondary battery housing member of the second embodiment, and more specifically, a cross-sectional view taken along the line VIII-VIII in FIG. 10. FIG. 9 is a cross-sectional view taken along the centerline direction of the secondary battery housing member of the second embodiment, and more specifically, a cross-sectional view taken along line IX-IX in FIG. 10. FIG. 10 is a sectional view taken along line XX in FIG. 8. FIG. 11 is a cross-sectional view of the secondary battery housing member of Embodiment 2 in a state where the metal case has moved in the second direction and is in contact with the regulating member.
　図８、図９に示すように、実施形態２の二次電池収容部材１００Ａは、基板３０が中心線方向に延在している点で、実施形態１と相違する。図９、図１０に示すように、基板３０の一面３０ａは、金属ケース１０の外周面１０ａと当接している。また、図１０に示すように、樹脂部４０は、基板３０の背面３０ｂの方に回り込み、筒状を成している。そして、樹脂部４０は、収容部材６０の内面６０ａに溶着し、基板３０及び金属ケース１０（二次電池１）を固定している。 As shown in FIGS. 8 and 9, the secondary battery housing member 100A of the second embodiment differs from the first embodiment in that the substrate 30 extends in the center line direction. As shown in FIGS. 9 and 10, one surface 30a of the substrate 30 is in contact with the outer circumferential surface 10a of the metal case 10. As shown in FIGS. Further, as shown in FIG. 10, the resin portion 40 wraps around toward the back surface 30b of the substrate 30 and has a cylindrical shape. The resin portion 40 is welded to the inner surface 60a of the housing member 60, and fixes the substrate 30 and the metal case 10 (secondary battery 1).
　図１０に示すように、金属ケース１０の外周面１０ａの一部が基板３０の一面３０ａと当接している。よって、樹脂部４０の外周壁部４２は、金属ケース１０の外周面１０ａの全周を覆っていない。つまり、実施形態２の外周壁部４２は、一部が切り欠かれ、断面視でＣ字状を成している。そして、基板３０は、外周壁部４２の切り欠かれた部分を塞いでいる。以上から、実施形態２では、金属ケース１０の外周側は、外周壁部４２と基板３０とにより囲まれている。 As shown in FIG. 10, a part of the outer peripheral surface 10a of the metal case 10 is in contact with one surface 30a of the substrate 30. Therefore, the outer peripheral wall part 42 of the resin part 40 does not cover the entire circumference of the outer peripheral surface 10a of the metal case 10. That is, the outer peripheral wall portion 42 of the second embodiment is partially cut out and has a C-shape in cross-sectional view. The substrate 30 then closes the cutout portion of the outer peripheral wall portion 42. As described above, in the second embodiment, the outer peripheral side of the metal case 10 is surrounded by the outer peripheral wall portion 42 and the substrate 30.
　図８、図９に示すように、基板３０の第２方向Ｘ２の端面３０ｃは、金属ケース１０の底部１２よりも第２方向Ｘ２に配置されている。基板３０の第２方向Ｘ２の端部には、規制部材５０が固定されている。 As shown in FIGS. 8 and 9, the end surface 30c of the substrate 30 in the second direction X2 is arranged further in the second direction X2 than the bottom 12 of the metal case 10. A regulating member 50 is fixed to the end of the substrate 30 in the second direction X2.
　このような実施形態２の二次電池収容部材１００Ａによれば、金属ケース１０の内圧が上昇すると、金属ケース１０は、外周壁部４２及び基板３０に案内されながら第２方向Ｘ２に移動する。これにより、金属ケース１０の容積が増加し、内圧の上昇が抑制される。また、図１１に示すように、金属ケース１０は、規制部材５０に接触する。よって、金属ケース１０が大きく移動する、ということが回避される。また、金属ケース１０の開口部１３は、外周壁部４２及び基板３０により囲まれており、電解液３が飛散しない。以上から、実施形態２であっても、実施形態１と同等な効果を奏することができる。 According to the secondary battery housing member 100A of the second embodiment, when the internal pressure of the metal case 10 increases, the metal case 10 moves in the second direction X2 while being guided by the outer peripheral wall 42 and the substrate 30. Thereby, the volume of the metal case 10 increases, and an increase in internal pressure is suppressed. Further, as shown in FIG. 11, the metal case 10 contacts the regulating member 50. Therefore, large movement of the metal case 10 is avoided. Further, the opening 13 of the metal case 10 is surrounded by the outer peripheral wall 42 and the substrate 30, so that the electrolyte 3 does not scatter. From the above, even in the second embodiment, the same effects as in the first embodiment can be achieved.
　以上、実施形態２について説明したが、本開示の外周壁部は、実施形態１で示したように筒状に限定されない。つまり、実施形態２で説明したように、本開示の外周壁部は、基板と協働して筒状を成していてもよい。 Although Embodiment 2 has been described above, the outer peripheral wall portion of the present disclosure is not limited to a cylindrical shape as shown in Embodiment 1. That is, as described in Embodiment 2, the outer peripheral wall of the present disclosure may cooperate with the substrate to form a cylindrical shape.
（実施形態３）
　図１２は、実施形態３の二次電池収容部材を中心線に沿って切った断面図である。図１２に示すように、実施形態３の二次電池収容部材１００Ｂは、基板３０が中心線方向に延在している点で、実施形態２と共通している。一方で、実施形態３の二次電池収容部材１００Ｂは、規制部材５０として、基板３０に設けられた電子部品５０Ｂを用いている点で、実施形態２と相違する。また、中心線方向に直交する面積に関し、電子部品５０Ｂは、底部１２の面１２ａよりも小さい。 (Embodiment 3)
FIG. 12 is a cross-sectional view of the secondary battery housing member of Embodiment 3 taken along the center line. As shown in FIG. 12, the secondary battery housing member 100B of the third embodiment is similar to the second embodiment in that the substrate 30 extends in the center line direction. On the other hand, the secondary battery housing member 100B of the third embodiment differs from the second embodiment in that an electronic component 50B provided on the substrate 30 is used as the regulating member 50. Furthermore, in terms of area perpendicular to the centerline direction, the electronic component 50B is smaller than the surface 12a of the bottom portion 12.
　このような二次電池収容部材１００Ｂであっても、金属ケース１０が第２方向Ｘ２に移動すると、電子部品５０Ｂに衝突し、金属ケース１０の移動が規制される。よって、実施形態１及び実施形態２と同様に、金属ケース１０が大きく移動する、ということが回避される。また、実施形態３によれば、規制部材５０を別途用意する必要がなく、部品点数の削減を図れる。さらに、本実施形態で示すように、本開示の規制部材は、電子部品５０Ｂのような中心線方向に直交する面積が小さいものであってもよい。つまり、規制部材は、金属ケース１０の移動を規制できれば、大きさについて特に限定されない。 Even in such a secondary battery housing member 100B, when the metal case 10 moves in the second direction X2, it collides with the electronic component 50B, and the movement of the metal case 10 is restricted. Therefore, similarly to the first and second embodiments, large movement of the metal case 10 is avoided. Further, according to the third embodiment, there is no need to separately prepare the regulating member 50, and the number of parts can be reduced. Furthermore, as shown in this embodiment, the regulating member of the present disclosure may have a small area perpendicular to the centerline direction, such as the electronic component 50B. That is, the size of the regulating member is not particularly limited as long as it can regulate the movement of the metal case 10.
（実施形態４）
　図１３は、実施形態４の二次電池収容部材を中心線に沿って切った断面図である。図１４は、図１３の矢印ＸＩＶの方向から視た図である。実施形態４の二次電池収容部材１００Ｃは、基板３０が中心線方向に延在している点で、実施形態２と共通している。一方で、実施形態４の二次電池収容部材１００Ｃは、基板３０に固定された３つのピン部材５２が規制部材５０Ｃを構成している点で、実施形態２と相違する。この実施形態３の二次電池収容部材１００Ｃであっても、金属ケース１０が第２方向Ｘ２に移動すると、ピン部材５２に衝突し、金属ケース１０の移動が規制される。よって、他の実施形態と同等な効果を奏する。このように本開示の規制部材は、１つの部品から構成されていなくてもよい。 (Embodiment 4)
FIG. 13 is a cross-sectional view of the secondary battery housing member of Embodiment 4 taken along the center line. FIG. 14 is a view seen from the direction of arrow XIV in FIG. 13. The secondary battery housing member 100C of the fourth embodiment is common to the second embodiment in that the substrate 30 extends in the center line direction. On the other hand, the secondary battery housing member 100C of the fourth embodiment differs from the second embodiment in that three pin members 52 fixed to the substrate 30 constitute a regulating member 50C. Even in the secondary battery housing member 100C of this third embodiment, when the metal case 10 moves in the second direction X2, it collides with the pin member 52, and the movement of the metal case 10 is restricted. Therefore, the same effects as other embodiments are achieved. In this way, the regulating member of the present disclosure does not need to be composed of one component.
（実施形態５）
　図１５は、実施形態５の二次電池収容部材を中心線に沿って切った断面図である。図１６は、実施形態５の二次電池収容部材であって、金属ケースが第２方向に移動し、規制部材に接触した状態の断面図である。図１５に示すように、実施形態５の二次電池収容部材１００Ｄは、基板３０が中心線方向に沿って延在するように配置されている点で、実施形態２と共通している。ただし、基板３０は、金属ケース１０に対し、第１方向Ｘ１に配置され、基板３０と当接していない点で実施形態２と相違する。そして、実施形態５の樹脂部４０の外周壁部４２は、筒部１１の外周面の全周を覆っており、筒状を成している。 (Embodiment 5)
FIG. 15 is a cross-sectional view of the secondary battery housing member of Embodiment 5 taken along the center line. FIG. 16 is a cross-sectional view of the secondary battery housing member of Embodiment 5 in a state where the metal case has moved in the second direction and is in contact with the regulating member. As shown in FIG. 15, a secondary battery housing member 100D according to the fifth embodiment is similar to the second embodiment in that the substrate 30 is arranged so as to extend along the centerline direction. However, the substrate 30 is different from the second embodiment in that the substrate 30 is arranged in the first direction X1 with respect to the metal case 10 and is not in contact with the substrate 30. The outer circumferential wall portion 42 of the resin portion 40 of the fifth embodiment covers the entire circumference of the outer circumferential surface of the cylindrical portion 11 and has a cylindrical shape.
　また、実施形態５の収容部材６０Ｄは、中心線方向に長尺状の棒を成している点で、他の実施形態と相違する。この収容部材６０Ｄは、肉類、魚類、野菜などの食材を貫通し、これらの食材を保持するために利用される。よって、食材を加熱する際、二次電池収容部材１００Ｄも一緒に加熱される可能性がある。 Furthermore, the accommodation member 60D of the fifth embodiment is different from the other embodiments in that it forms a long rod in the direction of the center line. This housing member 60D is used to penetrate foods such as meat, fish, and vegetables and hold these foods. Therefore, when heating the food, there is a possibility that the secondary battery housing member 100D is also heated together.
　収容部材６０Ｄは、筒状の収容部材本体６１と、収容部材本体６１の第２方向Ｘ２に配置された錘状部６２と、を有している。収容部材本体６１は、貫通した状態で食材を保持する部位である。錘状部６２は、第２方向Ｘ２に向かうにつれて外径が次第に縮径している。言い換えると、錘状部６２は、第２方向Ｘ２に向かうにつれて、先細り形状となっている。このため、食材を貫通し易くなっている。また、本実施形態において、収容部材本体６１は円筒形状と成し、錘状部６２は円錐形状と成っている。なお、本開示において、収容部材本体６１が角筒形状であり、錘状部６２が角錐形状であってもよい。 The housing member 60D has a cylindrical housing member body 61 and a weight-shaped portion 62 arranged in the second direction X2 of the housing member body 61. The housing member main body 61 is a part that holds food in a penetrating state. The outer diameter of the weight-shaped portion 62 gradually decreases in the second direction X2. In other words, the weight-shaped portion 62 has a tapered shape toward the second direction X2. Therefore, it becomes easier to penetrate the food material. Further, in this embodiment, the housing member main body 61 has a cylindrical shape, and the weight-shaped portion 62 has a conical shape. Note that in the present disclosure, the housing member main body 61 may have a rectangular tube shape, and the weight-shaped portion 62 may have a pyramid shape.
　また、収容部材本体６１の内周面６１ａには、樹脂部４０が溶着し、基板３０及び金属ケース１０が収容されている。錘状部６２の内面６２ａは、第２方向Ｘ２に向かって次第に縮径するテーパ面を成している。つまり、錘状部６２の内面６２ａの一部には、金属ケース１０の底部１２の外径と同一径と成っている部分を含んでいる。以下、錘状部６２の内面６２ａのうち、底部１２の外径と同径と成っている部分を同径部５０Ｄと称する。 Furthermore, the resin part 40 is welded to the inner peripheral surface 61a of the housing member main body 61, and the substrate 30 and the metal case 10 are housed therein. The inner surface 62a of the weight-shaped portion 62 has a tapered surface whose diameter gradually decreases in the second direction X2. That is, a portion of the inner surface 62a of the weight-shaped portion 62 includes a portion having the same diameter as the outer diameter of the bottom portion 12 of the metal case 10. Hereinafter, a portion of the inner surface 62a of the weight-shaped portion 62 that has the same diameter as the outer diameter of the bottom portion 12 will be referred to as a same-diameter portion 50D.
　実施形態５において、金属ケース１０の内圧が上昇し、金属ケース１０が第２方向Ｘ２へ移動すると、金属ケース１０の底部１２の角部１２ｂが同径部５０Ｄと接触する。これにより、金属ケース１０が大きく移動する、ということが回避される。よって、実施形態５では、同径部５０Ｄが規制部材の役割を果たしている。そして、実施形態５の二次電池収容部材１００Ｄであっても、他の実施形態と同等な効果を奏することができる。また、実施形態５によれば、規制部材を別途用意する必要がないため、部品点数の削減を図れる。 In the fifth embodiment, when the internal pressure of the metal case 10 increases and the metal case 10 moves in the second direction X2, the corner portion 12b of the bottom portion 12 of the metal case 10 comes into contact with the same diameter portion 50D. This prevents the metal case 10 from moving significantly. Therefore, in the fifth embodiment, the same diameter portion 50D plays the role of a regulating member. Even with the secondary battery housing member 100D of the fifth embodiment, the same effects as those of the other embodiments can be achieved. Further, according to the fifth embodiment, since there is no need to separately prepare a regulating member, the number of parts can be reduced.
　なお、実施形態５においては、二次電池収容部材１００Ｄ自体が加熱される可能性がある。よって、二次電池１の負極７の負極活物質層は、高温に対し優れた耐性を有する、リチウム吸蔵・放出電位がＬｉ／Ｌｉ+の標準電極電位に対して１．０Ｖ以上貴な負極活物質を含んでいることが好ましい。より好ましくは、負極活物質は、高温に対し極めて優れた耐性を有する、スピネル型結晶構造を有するリチウムチタン酸化物（Ｌｉ４Ｔｉ５Ｏ１２）を含んでいることが好ましい。 In addition, in Embodiment 5, there is a possibility that the secondary battery housing member 100D itself is heated. Therefore, the negative electrode active material layer of the negative electrode 7 of the secondary battery 1 is a negative electrode active material layer that has excellent resistance to high temperatures and has a lithium absorption/desorption potential of 1.0 V or more with respect to the standard electrode potential of Li/Li +. Preferably, it contains a substance. More preferably, the negative electrode active material contains lithium titanium oxide (Li 4 Ti 5 O 12 ) having a spinel crystal structure and having extremely high resistance to high temperatures.
（実施例）
　次に実施例について説明する。実施形態で説明した二次電池収容部材（実施例）を製造し、２つの試験を行った。実施例として、実施例１、実施例２、実施例３、実施例４、実施例５、実施例６、実施例７、実施例８を用意した。各実施例は以下の通りである。 (Example)
Next, an example will be described. The secondary battery housing member (Example) described in the embodiment was manufactured and two tests were conducted. As Examples, Example 1, Example 2, Example 3, Example 4, Example 5, Example 6, Example 7, and Example 8 were prepared. Each example is as follows.
（実施例１）
　実施例１は、実施形態２で示した二次電池収容部材１００Ａである。また、挿入量ａは２ｍｍ、ケース長さｂは１２ｍｍ、離間距離Ｘは２ｍｍ、外周壁部長さＹが２．１ｍｍである。また、規制部材５０は、中心線方向から視て、４ｍｍ×４ｍｍの正方形を成す板部材である。 (Example 1)
Example 1 is the secondary battery housing member 100A shown in Embodiment 2. Further, the insertion amount a is 2 mm, the case length b is 12 mm, the separation distance X is 2 mm, and the outer peripheral wall length Y is 2.1 mm. Further, the regulating member 50 is a plate member having a square shape of 4 mm x 4 mm when viewed from the center line direction.
（実施例２、実施例３）
　実施例２と実施例３は、実施例１の一部を変更したものである。詳細には、実施例２は、外周壁部長さＹを１２ｍｍに変更している。実施例３は、離間距離Ｘを１１．９ｍｍに変更している。 (Example 2, Example 3)
Embodiment 2 and Embodiment 3 are partially modified versions of Embodiment 1. Specifically, in Example 2, the outer peripheral wall length Y is changed to 12 mm. In Example 3, the separation distance X is changed to 11.9 mm.
（実施例４）
　実施例４は、実施形態２で示した二次電池収容部材１００Ａである。挿入量ａは２ｍｍ、ケース長さｂは１２ｍｍ、離間距離Ｘは３ｍｍ、外周壁部長さＹが１０ｍｍと成っている。また、規制部材は、中心線方向から視て、４ｍｍ×４ｍｍの正方形を成す板部材である。 (Example 4)
Example 4 is the secondary battery housing member 100A shown in Embodiment 2. The insertion amount a is 2 mm, the case length b is 12 mm, the separation distance X is 3 mm, and the outer peripheral wall length Y is 10 mm. Further, the regulating member is a plate member having a square shape of 4 mm x 4 mm when viewed from the center line direction.
（実施例５、実施例６、実施例７、実施例８）
　実施例５以下は、規制部材を変更した点で、実施例４と相違する。詳細には、実施形態５の規制部材は、実施形態３で示したように、基板に積載された電子部品である。電子部品は、７．３ｍｍ×４．３ｍｍ×２ｍｍの立方体である。実施例６の規制部材は、実施形態４で示したように、３つのピンにより構成される。ピンは、外径が０．５ｍｍであり、長さが４ｍｍである。実施例７は、中心線方向から視て、２ｍｍ×４ｍｍの長方形を成す板部材である。なお、中心線方向から視ると、規制部材は、金属ケースの底部に対し、半分だけ重なっている。実施例８の記載部材は、実施形態５の収容部材であり、錘状部の同径部が規制部材を成している。 (Example 5, Example 6, Example 7, Example 8)
Embodiment 5 and subsequent embodiments differ from Embodiment 4 in that the regulating member is changed. Specifically, the regulating member of the fifth embodiment is an electronic component mounted on a board as shown in the third embodiment. The electronic component is a cube measuring 7.3 mm x 4.3 mm x 2 mm. The regulating member of Example 6 is composed of three pins, as shown in Embodiment 4. The pin has an outer diameter of 0.5 mm and a length of 4 mm. Example 7 is a plate member having a rectangular shape of 2 mm x 4 mm when viewed from the center line direction. Note that, when viewed from the centerline direction, the regulating member overlaps only half of the bottom of the metal case. The described member of Example 8 is the accommodation member of Embodiment 5, and the same diameter portion of the weight-shaped portion constitutes a regulating member.
　また、実施例の効果を確認するため、比較例１、比較例２、比較例３、比較例４、比較例５を用意した。各比較例は、以下の通りである。 Additionally, in order to confirm the effects of the examples, Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, and Comparative Example 5 were prepared. Each comparative example is as follows.
（比較例１）
　図１７は、比較例１の二次電池収容部材を中心線方向に沿って切った断面図である。図１８は、図１７の矢印ＸＶＩＩＩ方向から視た図である。図１７に示すように、比較例１の二次電池収容部材２００は、二次電池２０１（電極組立体２０２、金属ケース２１０、封止部材２２０、リード２３１）と、基板２３０と、を備えている。よって、二次電池収容部材２００は、樹脂部４０と規制部材５０と収容部材６０を備えていない点で、実施例１と相違する。また、比較例１において、挿入量ａは２ｍｍ、ケース長さｂは１２ｍｍとなっており、実施例１と共通している。また、図１８に示すように、金属ケース２１０の底部２１２の第２方向Ｘ２の面２１３に、薄肉部（防爆弁）２１３ａが設けられている。 (Comparative example 1)
FIG. 17 is a cross-sectional view of the secondary battery housing member of Comparative Example 1 taken along the centerline direction. FIG. 18 is a view seen from the direction of arrow XVIII in FIG. 17. As shown in FIG. 17, the secondary battery housing member 200 of Comparative Example 1 includes a secondary battery 201 (electrode assembly 202, metal case 210, sealing member 220, lead 231) and a substrate 230. There is. Therefore, the secondary battery housing member 200 differs from Example 1 in that it does not include the resin portion 40, the regulating member 50, and the housing member 60. Further, in Comparative Example 1, the insertion amount a is 2 mm, and the case length b is 12 mm, which are common to Example 1. Further, as shown in FIG. 18, a thin wall portion (explosion-proof valve) 213a is provided on the surface 213 of the bottom portion 212 of the metal case 210 in the second direction X2.
（比較例２）
　特に図示しないが、比較例２の二次電池収容部材は、比較例１の二次電池収容部材２００と同じ構成と成っている。つまり、比較例２の二次電池収容部材は、二次電池２０１（電極組立体２０２、金属ケース２１０、封止部材２２０、リード２３１）と、基板２３０と、を備えている（図１７参照）。一方で、比較例２は、薄肉部２１３ａが設けられていない点で、比較例１と相違する。よって、比較例２では、金属ケースの底部の第２方向の面は、平面である。 (Comparative example 2)
Although not particularly illustrated, the secondary battery housing member of Comparative Example 2 has the same configuration as the secondary battery housing member 200 of Comparative Example 1. That is, the secondary battery housing member of Comparative Example 2 includes a secondary battery 201 (electrode assembly 202, metal case 210, sealing member 220, lead 231) and a substrate 230 (see FIG. 17). . On the other hand, Comparative Example 2 differs from Comparative Example 1 in that the thin portion 213a is not provided. Therefore, in Comparative Example 2, the bottom surface of the metal case in the second direction is a flat surface.
（比較例３）
　図１９は、比較例３の二次電池収容部材を中心線方向に沿って切った断面図である。図１９に示すように、比較例３の二次電池収容部材２００Ｃは、薄肉部（防爆弁）２１３ａが設けられていない点で、比較例２と共通する。一方で、比較例３の二次電池収容部材２００Ｃは、樹脂部２４０を備えている点で、比較例２と相違する。樹脂部２４０は、実施形態２で示した樹脂部４０と同じ（実施例１の樹脂部と同じ）であり、樹脂封止部２４１と外周壁部２４２を有している。外周壁部長さＹは、１０ｍｍであり、外周壁部２４２は、ケース長さＸ（１２ｍｍ）よりも短い。 (Comparative example 3)
FIG. 19 is a cross-sectional view of the secondary battery housing member of Comparative Example 3 taken along the centerline direction. As shown in FIG. 19, the secondary battery housing member 200C of Comparative Example 3 is similar to Comparative Example 2 in that a thin wall portion (explosion-proof valve) 213a is not provided. On the other hand, the secondary battery housing member 200C of Comparative Example 3 differs from Comparative Example 2 in that it includes a resin portion 240. The resin part 240 is the same as the resin part 40 shown in Embodiment 2 (same as the resin part in Example 1), and has a resin sealing part 241 and an outer peripheral wall part 242. The length Y of the outer peripheral wall portion is 10 mm, and the outer peripheral wall portion 242 is shorter than the case length X (12 mm).
（比較例４）
　図２０は、比較例４の二次電池収容部材を中心線方向に沿って切った断面図である。図２０に示すように、比較例４の二次電池収容部材２００Ｄは、樹脂部２４０が底部２１２の面２１３を覆っている点で、比較例３と相違する。つまり、外周壁部２４２は、底部の面２１３よりも第２方向Ｘ２に配置された被覆部２４３を有している。被覆部２４３を含む外周壁部２４２の外周壁部長さＹは１４ｍｍである。よって、外周壁部長さＹはケース長さＸ（１２ｍｍ）よりも長く、式（３）を満たしていない例である。 (Comparative example 4)
FIG. 20 is a cross-sectional view of the secondary battery housing member of Comparative Example 4 taken along the centerline direction. As shown in FIG. 20, the secondary battery housing member 200D of Comparative Example 4 differs from Comparative Example 3 in that the resin portion 240 covers the surface 213 of the bottom portion 212. That is, the outer peripheral wall portion 242 has a covering portion 243 that is disposed in the second direction X2 with respect to the bottom surface 213. The length Y of the outer peripheral wall portion of the outer peripheral wall portion 242 including the covering portion 243 is 14 mm. Therefore, the outer peripheral wall length Y is longer than the case length X (12 mm), and this is an example in which the formula (3) is not satisfied.
（比較例５）
　図２１は、比較例５の二次電池収容部材を中心線方向に沿って切った断面図である。図２１に示すように、比較例５の二次電池収容部材２００Ｅは、規制部材２５０を備えている点で、比較例２と相違する。一方で、二次電池収容部材２００Ｅは、樹脂部を有していない点で、他の比較例と相違する。 (Comparative example 5)
FIG. 21 is a cross-sectional view of the secondary battery housing member of Comparative Example 5 taken along the centerline direction. As shown in FIG. 21, a secondary battery housing member 200E of Comparative Example 5 differs from Comparative Example 2 in that it includes a regulating member 250. On the other hand, the secondary battery housing member 200E is different from other comparative examples in that it does not have a resin portion.
（試験１）
　試験１では、各実施例及び各比較例を各１０個ずつ用意した。次に、各実施例及び各比較例の電極組立体に過電圧を印加し、金属ケースの内圧を上昇させ、金属ケースが大きく移動するようにした。そして、その後の金属ケースの状態を確認した。その確認した結果について、下記の表１に示す。 (Test 1)
In Test 1, 10 pieces of each Example and each Comparative Example were prepared. Next, an overvoltage was applied to the electrode assemblies of each example and each comparative example to increase the internal pressure of the metal case, causing the metal case to move significantly. Then, we checked the condition of the metal case. The confirmed results are shown in Table 1 below.
Figure JPOXMLDOC01-appb-T000007
Figure JPOXMLDOC01-appb-T000007
　なお、表１の評価結果１は、金属ケースの移動性に関する確認結果である。表１において、金属ケースが第２方向に移動し、かつ規制部材に接触して止まった場合を「〇」としている。一方、金属ケースが第２方向に移動しなかった場合、又は大きく移動した場合を「×」としている。 Note that evaluation result 1 in Table 1 is a confirmation result regarding the mobility of the metal case. In Table 1, the case where the metal case moves in the second direction and comes into contact with the regulating member and stops is marked as "O". On the other hand, a case where the metal case did not move in the second direction or a case where it moved significantly is marked as "×".
　評価結果２は、金属ケースの破損に関する確認結果である。金属ケースが破損しておらず、かつ電解液も飛散していない場合を「〇」としている。一方で、金属ケースが破損していた場合、又は、金属ケースが破損していないものの電解液が飛散している場合を「×」としている。 Evaluation result 2 is a confirmation result regarding damage to the metal case. The case where the metal case is not damaged and the electrolyte is not scattered is rated as “〇”. On the other hand, a case where the metal case is damaged or a case where the metal case is not damaged but the electrolyte is scattered is marked as "x".
　実施例１、実施例２、実施例３、実施例４、実施例５、実施例６、実施例７、及び実施例８については、金属ケースが第２方向Ｘ２に移動した。また、金属ケースは、規制部材に接触し、第２方向Ｘ２への移動が停止した。よって、金属ケースが第２方向Ｘ２に大きく移動しなかった。金属ケースに破損がなかった。また、金属ケースの開口部は樹脂部の内部にあり、電解液及びガスは、樹脂部の内部に留まっていた。よって、各実施例が高い安全性を有していることが確認できた。 In Examples 1, 2, 3, 4, 5, 6, 7, and 8, the metal case moved in the second direction X2. Furthermore, the metal case came into contact with the regulating member and stopped moving in the second direction X2. Therefore, the metal case did not move significantly in the second direction X2. There was no damage to the metal case. Further, the opening of the metal case was located inside the resin part, and the electrolyte and gas remained inside the resin part. Therefore, it was confirmed that each Example had high safety.
　比較例１については、金属ケースは第２方向Ｘ２に移動しなかった。そして、１０個中の３個が金属ケースの開口部側が破損した。よって、電解液も飛散した。また、残り７個は、薄肉部（防爆弁）２１３ａが開裂し、電解液も飛散した。 Regarding Comparative Example 1, the metal case did not move in the second direction X2. In three out of ten, the opening side of the metal case was damaged. Therefore, the electrolyte was also scattered. In addition, in the remaining seven valves, the thin wall portion (explosion-proof valve) 213a was ruptured, and the electrolyte was also scattered.
　比較例２と比較例３は、樹脂部があるものの規制部材がないため、金属ケースが第２方向Ｘ２に大きく移動した。また、金属ケースの開口部は、樹脂部から抜けたため、電解液が飛散した。 In Comparative Examples 2 and 3, although there was a resin part, there was no regulating member, so the metal case moved significantly in the second direction X2. In addition, the opening of the metal case escaped from the resin part, causing the electrolyte to scatter.
　比較例４は、樹脂部が金属ケース１０の底部１２に回り込んでおり、金属ケースは移動しなかった。そして、内圧が所定値を超えた後に金属ケースが破損した。金属ケースに併せて、樹脂部も破損し、電解液が飛散した。 In Comparative Example 4, the resin part wrapped around the bottom 12 of the metal case 10, and the metal case did not move. The metal case was damaged after the internal pressure exceeded a predetermined value. In addition to the metal case, the resin part was also damaged and the electrolyte was scattered.
　比較例５は、樹脂部を有していないため、金属ケースが規制部材に接触せず、第２方向Ｘ２に大きく移動した。そして、金属ケースの開口部から電解液が飛散した。以上から、樹脂部又は規制部材を有していない比較例１、比較例２、比較例３、比較例４、比較例５は、金属ケースが大きく移動することの抑制、金属ケースの破損回避、電解液に飛散防止、の全てを満たしておらず、安全性の向上を確認できなかった。 Since Comparative Example 5 did not have a resin part, the metal case did not come into contact with the regulating member and moved largely in the second direction X2. Then, the electrolyte was scattered from the opening of the metal case. From the above, Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, and Comparative Example 5, which do not have a resin part or a regulating member, suppress the large movement of the metal case, avoid damage to the metal case, The electrolyte did not meet all of the requirements for scattering prevention, and no improvement in safety could be confirmed.
（試験２）
　試験２では、各実施例及び各比較例を各３０個ずつ用意した。そして、各実施例及び各比較例の二次電池を満充電し、６０℃９０％ＲＨの環境下で２８日放置した。その後、各実施例及び各比較例の電池を放電させた。また、放電の際、その放電容量から容量回復率を求めた。容量回復率（％）とは、前記環境で保存する前の放電容量に対する保存後の放電容量の割合である。容量回復率の結果を表２に示す。なお、表２に示す容量回復率は、３０個の平均値である。 (Test 2)
In Test 2, 30 pieces of each Example and each Comparative Example were prepared. Then, the secondary batteries of each Example and each Comparative Example were fully charged and left in an environment of 60° C. and 90% RH for 28 days. Thereafter, the batteries of each Example and each Comparative Example were discharged. In addition, during discharge, the capacity recovery rate was determined from the discharge capacity. The capacity recovery rate (%) is the ratio of the discharge capacity after storage to the discharge capacity before storage in the environment. Table 2 shows the results of the capacity recovery rate. Note that the capacity recovery rates shown in Table 2 are the average values of 30 samples.
Figure JPOXMLDOC01-appb-T000008
Figure JPOXMLDOC01-appb-T000008
　表２に示すように、外周壁部長さＹが１０ｍｍ以上の実施例２、実施例３、実施例４、実施例５、実施例６、実施例７、実施例８、比較例３、及び比較例４は、回復容量率が９４％以上であり、耐湿性への信頼性が高い結果となった。また、実施例１は、外周壁部長さＹが２．１ｍｍであり、回復容量率が８９．７％となった。樹脂部を有していない比較例１、比較例２、比較例５の回復容量率は、８６．１％、８６．５％、８５．９％であり、実施例１の方が良い結果となった。以上から、外周壁部を有している場合、耐湿性への信頼性が高いことがわかった。 As shown in Table 2, Example 2, Example 3, Example 4, Example 5, Example 6, Example 7, Example 8, Comparative Example 3, and Comparison where the outer peripheral wall length Y is 10 mm or more In Example 4, the recovery capacity rate was 94% or more, and the moisture resistance was highly reliable. Further, in Example 1, the length Y of the outer peripheral wall portion was 2.1 mm, and the recovery capacity rate was 89.7%. The recovery capacity rates of Comparative Example 1, Comparative Example 2, and Comparative Example 5, which do not have a resin part, are 86.1%, 86.5%, and 85.9%, indicating that Example 1 has a better result. became. From the above, it was found that moisture resistance is highly reliable when the outer peripheral wall is included.
　なお、本開示は、以下のような構成の組み合わせであってもよい。
（１）
　電極組立体と、第１方向に開口する開口部を有し、内部に前記電極組立体を収容する金属ケースと、前記開口部に挿入され、前記開口部を封止する封止部材と、前記封止部材を貫通して前記電極組立体と接続されたリードと、を有する二次電池と、
　前記リードに接続された基板と、
　前記基板に溶着された樹脂部と、
　前記金属ケースに対し、前記第１方向と反対の第２方向に配置された規制部材と、
　を有し、
　前記金属ケースは、
　筒状を成し、前記第１方向の端部に前記開口部が設けられている筒部と、
　前記筒部の前記第２方向を閉塞する底部と、
　を有し、
　前記樹脂部は、前記筒部の外周側、前記開口部、および前記封止部材を覆い、
　前記規制部材は、前記底部に対し前記第２方向に離れて配置され、
　前記規制部材の少なくとも一部は、前記底部と対向している
　二次電池収容部材。
（２）
　前記規制部材と前記底部との距離をＸとし、
　前記金属ケースの前記第１方向の端面を起点として前記第２方向に向かって挿入された前記封止部材の挿入量をａとし、
　下記式（４）を満たす（１）に記載の二次電池収容部材。
Figure JPOXMLDOC01-appb-M000009
 （３）
　前記樹脂部は、
　前記第１方向から前記開口部及び前記封止部材を覆う樹脂封止部と、
　前記樹脂封止部から前記筒部の外周面に沿って前記第２方向に延在し、前記筒部の外周側を覆う外周壁部と、
　を有し、
　前記規制部材と前記底部との距離をＸとし、
　前記金属ケースの前記第１方向の端面を起点として前記外周壁部の前記第２方向への長さをＹとし、
　下記式（５）を満たす（１）または（２）に記載の二次電池収容部材。
Figure JPOXMLDOC01-appb-M000010
 （４）
　前記金属ケースの前記第１方向の端面を起点として前記外周壁部の前記第２方向への長さをＹとし、
　前記金属ケースの前記第１方向の端面から前記第２方向の端面までの長さをｂとし、
　下記式（６）を満たす（３）に記載の二次電池収容部材。
Figure JPOXMLDOC01-appb-M000011
 （５）
　前記二次電池、前記基板、及び前記樹脂部を収容する収容部材を有し、
　前記収容部材の内周面は、前記第２方向に向かって次第に縮径するテーパ面を有し、
　前記テーパ面は、前記底部に対し前記第２方向に配置され、前記規制部材を成している
　（１）から（４）のいずれか１つに記載の二次電池収容部材。
（６）
　前記電極組立体の負極は、リチウム吸蔵・放出電位がＬｉ／Ｌｉ+の標準電極電位に対して１．０Ｖ以上貴な負極活物質を含む
　（５）に記載の二次電池収容部材。
（７）
　前記負極活物質は、スピネル型結晶構造を有するリチウムチタン酸化物（Ｌｉ４Ｔｉ５Ｏ１２）を含む
　（６）に記載の二次電池収容部材。 Note that the present disclosure may be a combination of the following configurations.
(1)
an electrode assembly; a metal case having an opening opening in a first direction and accommodating the electrode assembly therein; a sealing member inserted into the opening and sealing the opening; a secondary battery having a lead that passes through a sealing member and is connected to the electrode assembly;
a substrate connected to the lead;
a resin part welded to the substrate;
a regulating member disposed in a second direction opposite to the first direction with respect to the metal case;
has
The metal case is
a cylindrical portion having a cylindrical shape and having the opening at the end in the first direction;
a bottom portion that closes the second direction of the cylindrical portion;
has
The resin part covers the outer peripheral side of the cylindrical part, the opening, and the sealing member,
the regulating member is arranged apart from the bottom in the second direction;
At least a portion of the regulating member faces the bottom portion of the secondary battery housing member.
(2)
Let the distance between the regulating member and the bottom be X,
an insertion amount of the sealing member inserted toward the second direction starting from the end surface of the metal case in the first direction,
The secondary battery housing member according to (1), which satisfies the following formula (4).
Figure JPOXMLDOC01-appb-M000009
 (3)
The resin part is
a resin sealing part that covers the opening and the sealing member from the first direction;
an outer peripheral wall portion extending from the resin sealing portion in the second direction along the outer peripheral surface of the cylindrical portion and covering the outer peripheral side of the cylindrical portion;
has
Let the distance between the regulating member and the bottom be X,
The length of the outer peripheral wall portion in the second direction starting from the end face of the metal case in the first direction is Y,
The secondary battery housing member according to (1) or (2), which satisfies the following formula (5).
Figure JPOXMLDOC01-appb-M000010
 (4)
The length of the outer peripheral wall portion in the second direction starting from the end face of the metal case in the first direction is Y,
The length from the end face in the first direction to the end face in the second direction of the metal case is b,
The secondary battery housing member according to (3), which satisfies the following formula (6).
Figure JPOXMLDOC01-appb-M000011
 (5)
comprising a housing member that houses the secondary battery, the substrate, and the resin part,
The inner circumferential surface of the housing member has a tapered surface that gradually reduces in diameter toward the second direction,
The secondary battery accommodating member according to any one of (1) to (4), wherein the tapered surface is arranged in the second direction with respect to the bottom portion and forms the regulating member.
(6)
The secondary battery housing member according to (5), wherein the negative electrode of the electrode assembly includes a negative electrode active material whose lithium absorption/desorption potential is 1.0 V or more noble with respect to the standard electrode potential of Li/Li + .
(7)
The secondary battery housing member according to (6), wherein the negative electrode active material includes lithium titanium oxide (Li 4 Ti 5 O 12 ) having a spinel crystal structure.
　１００、１００Ａ、１００Ｂ、１００Ｃ、１００Ｄ　　二次電池収容部材
　１　　二次電池
　２　　電極組立体
　３　　電解液
　４　　巻回体
　５　　タブ
　６　　正極
　７　　負極
　８　　セパレーター
　１０　　金属ケース
　１１　　筒部
　１２　　底部
　２０　　封止部材
　３０　　基板
　３１　　リード
　４０　　樹脂部
　４１　　樹脂封止部
　４２　　外周壁部
　５０、５０Ｃ　　規制部材
　５０Ｂ　　電子部品
　５０Ｄ　　同径部
　５２　　ピン部材
　６０、６０Ｄ　　収容部材
　６１　　収容部材本体
　６２　　錘状部 100, 100A, 100B, 100C, 100D Secondary battery housing member 1 Secondary battery 2 Electrode assembly 3 Electrolyte 4 Winding body 5 Tab 6 Positive electrode 7 Negative electrode 8 Separator 10 Metal case 11 Cylindrical part 12 Bottom part 20 Sealing member 30 Substrate 31 Lead 40 Resin part 41 Resin sealing part 42 Outer peripheral wall part 50, 50C Regulating member 50B Electronic component 50D Same diameter part 52 Pin member 60, 60D Accommodating member 61 Accommodating member main body 62 Plumb-shaped part

Claims (7)

  1. 　電極組立体と、第１方向に開口する開口部を有し、内部に前記電極組立体を収容する金属ケースと、前記開口部に挿入され、前記開口部を封止する封止部材と、前記封止部材を貫通して前記電極組立体と接続されたリードと、を有する二次電池と、
    　前記リードに接続された基板と、
    　前記基板に溶着された樹脂部と、
    　前記金属ケースに対し、前記第１方向と反対の第２方向に配置された規制部材と、
    　を有し、
    　前記金属ケースは、
    　筒状を成し、前記第１方向の端部に前記開口部が設けられている筒部と、
    　前記筒部の前記第２方向を閉塞する底部と、
    　を有し、
    　前記樹脂部は、前記筒部の外周側、前記開口部、および前記封止部材を覆い、
    　前記規制部材は、前記底部に対し前記第２方向に離れて配置され、
    　前記規制部材の少なくとも一部は、前記底部と対向している
    　二次電池収容部材。     an electrode assembly; a metal case having an opening opening in a first direction and accommodating the electrode assembly therein; a sealing member inserted into the opening and sealing the opening; a secondary battery having a lead that passes through a sealing member and is connected to the electrode assembly;
    a substrate connected to the lead;
    a resin part welded to the substrate;
    a regulating member disposed in a second direction opposite to the first direction with respect to the metal case;
    has
    The metal case is
    a cylindrical portion having a cylindrical shape and having the opening at the end in the first direction;
    a bottom portion that closes the second direction of the cylindrical portion;
    has
    The resin part covers the outer peripheral side of the cylindrical part, the opening, and the sealing member,
    the regulating member is arranged apart from the bottom in the second direction;
    At least a portion of the regulating member faces the bottom portion of the secondary battery housing member.
  2. 　前記規制部材と前記底部との距離をＸとし、
    　前記金属ケースの前記第１方向の端面を起点として前記第２方向に向かって挿入された前記封止部材の挿入量をａとし、
    　下記式（１）を満たす請求項１に記載の二次電池収容部材。
    Figure JPOXMLDOC01-appb-M000001
         Let the distance between the regulating member and the bottom be X,
    an insertion amount of the sealing member inserted toward the second direction starting from the end surface of the metal case in the first direction,
    The secondary battery housing member according to claim 1, which satisfies the following formula (1).
    Figure JPOXMLDOC01-appb-M000001
  3. 　前記樹脂部は、
    　前記第１方向から前記開口部及び前記封止部材を覆う樹脂封止部と、
    　前記樹脂封止部から前記筒部の外周面に沿って前記第２方向に延在し、前記筒部の外周側を覆う外周壁部と、
    　を有し、
    　前記金属ケースの前記第１方向の端面を起点として前記外周壁部の前記第２方向への長さをＹとし、
    　下記式（２）を満たす請求項１又は請求項２に記載の二次電池収容部材。
    Figure JPOXMLDOC01-appb-M000002
         The resin part is
    a resin sealing part that covers the opening and the sealing member from the first direction;
    an outer peripheral wall portion extending in the second direction from the resin sealing portion along the outer peripheral surface of the cylindrical portion and covering the outer peripheral side of the cylindrical portion;
    has
    The length of the outer peripheral wall portion in the second direction starting from the end surface of the metal case in the first direction is Y,
    The secondary battery housing member according to claim 1 or claim 2, which satisfies the following formula (2).
    Figure JPOXMLDOC01-appb-M000002
  4. 　前記金属ケースの前記第１方向の端面から前記第２方向の端面までの長さをｂとし、
    　下記式（３）を満たす請求項３に記載の二次電池収容部材。
    Figure JPOXMLDOC01-appb-M000003
         The length from the end face in the first direction to the end face in the second direction of the metal case is b,
    The secondary battery housing member according to claim 3, which satisfies the following formula (3).
    Figure JPOXMLDOC01-appb-M000003
  5. 　前記二次電池、前記基板、及び前記樹脂部を収容する収容部材を有し、
    　前記収容部材の内周面は、前記第２方向に向かって次第に縮径するテーパ面を有し、
    　前記テーパ面は、前記底部に対し前記第２方向に配置され、前記規制部材を成している
    　請求項１から請求項４のいずれか１項に記載の二次電池収容部材。     comprising a housing member that houses the secondary battery, the substrate, and the resin part,
    The inner circumferential surface of the housing member has a tapered surface that gradually reduces in diameter toward the second direction,
    The secondary battery housing member according to any one of claims 1 to 4, wherein the tapered surface is arranged in the second direction with respect to the bottom and forms the regulating member.
  6. 　前記電極組立体の負極は、リチウム吸蔵・放出電位がＬｉ／Ｌｉ+の標準電極電位に対して１．０Ｖ以上貴な負極活物質を含む
    　請求項５に記載の二次電池収容部材。     The secondary battery housing member according to claim 5, wherein the negative electrode of the electrode assembly includes a negative electrode active material whose lithium absorption/desorption potential is 1.0 V or more nobler than the standard electrode potential of Li/Li + .
  7. 　前記負極活物質は、スピネル型結晶構造を有するリチウムチタン酸化物（Ｌｉ４Ｔｉ５Ｏ１２）を含む
    　請求項６に記載の二次電池収容部材。     The secondary battery housing member according to claim 6, wherein the negative electrode active material includes lithium titanium oxide ( Li4Ti5O12 ) having a spinel crystal structure.
PCT/JP2023/022794 2022-08-08 2023-06-20 Secondary battery housing member WO2024034262A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011090794A (en) * 2009-10-20 2011-05-06 Panasonic Corp Negative electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery
JP2013118186A (en) * 2011-12-02 2013-06-13 Lenovo Singapore Pte Ltd Electrochemical cell package
US20130216881A1 (en) * 2010-10-16 2013-08-22 Winfried Gaugler Button cell having bursting protection
US20190198911A1 (en) * 2017-12-26 2019-06-27 Samsung Electronics Co., Ltd. Lithium secondary battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011090794A (en) * 2009-10-20 2011-05-06 Panasonic Corp Negative electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery
US20130216881A1 (en) * 2010-10-16 2013-08-22 Winfried Gaugler Button cell having bursting protection
JP2013118186A (en) * 2011-12-02 2013-06-13 Lenovo Singapore Pte Ltd Electrochemical cell package
US20190198911A1 (en) * 2017-12-26 2019-06-27 Samsung Electronics Co., Ltd. Lithium secondary battery

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