Laminated film, electrode laminate and battery

Abstract

The invention relates to a laminated film, an electrode laminate, and a battery. The present disclosure simply provides a laminated film and an electrode laminate that make the laminate structure of the electrode laminate less likely to collapse, and a battery including such a laminated film or an electrode laminate. A laminated film (11) according to the present disclosure is used to seal an electrode laminate (12) to produce a battery (10). A laminated film (11) according to the present disclosure has a rod-like buffer member (13) fixed at a position in contact with at least two opposing side surface portions of the side surface portions of an electrode laminate (12). An electrode laminate (22) according to the present disclosure is used for producing a battery (20) by being sealed with a laminate film (21). An electrode laminate (22) according to the present disclosure has rod-shaped buffer members (23) fixed to at least two opposing side surfaces. The battery of the present disclosure includes an electrode laminate, and a laminated film sealing the electrode laminate, either of which is the electrode laminate or the laminated film of the present disclosure.

Description

Technical Field

[0001] The present disclosure relates to a laminate film, an electrode stack, and a battery. Background Art

[0002] For example, as disclosed in Patent Document 1, there is known a laminated battery (laminated battery) including an electrode laminate and a current collector terminal electrically connected to a current collector foil of the electrode laminate, wherein the electrode laminate is sealed with a laminate film.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-170583 Summary of the invention

[0006] Problems to be solved by the invention

[0007] Usually, the electrode stack is fixed only by the collector tab. Therefore, due to external impact on the electrode stack, the stacked structure of the electrode stack may collapse and the collector tab may be damaged.

[0008] An object of the present disclosure is to simply provide a laminate film and an electrode laminate in which the laminate structure of an electrode laminate is less likely to collapse, and a battery including such a laminate film or an electrode laminate.

[0009] Means for solving problems

[0010] The inventors of the present application have found that the above-mentioned problems can be solved by the following means.

[0011] <Scheme 1>

[0012] The laminate film is used to seal an electrode laminate to produce a battery, and rod-shaped buffer members are fixed to positions contacting at least two opposing side surfaces of the side surfaces of the electrode laminate.

[0013] <Scheme 2>

[0014] The laminate film according to claim 1, wherein the length of the rod-shaped buffer member in the stacking direction of the electrode stack is the same as or smaller than the thickness of the electrode stack.

[0015] <Scheme 3>

[0016] A battery comprising an electrode stack and the laminate film according to aspect 1 or 2 for sealing the electrode stack.

[0017] <Scheme 4>

[0018] The electrode stack is an electrode stack for producing a battery by sealing with a laminate film, and rod-shaped buffer members are fixed to at least two opposing side surfaces.

[0019] <Scheme 5>

[0020] A battery comprising the electrode stack according to claim 4 and a laminate film sealing the electrode stack.

[0021] According to the present disclosure, it is possible to easily provide a laminate film and an electrode laminate in which the laminate structure of the electrode laminate is less likely to collapse, and a battery including such a laminate film or an electrode laminate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic perspective view showing an example of an electrode stack and a laminate film of the present disclosure before the electrode stack is sealed.

[0023] Figure 2 This is a schematic perspective view showing an example of the electrode stack of the present disclosure.

[0024] Figure 3 This is a schematic plan view showing an example of the battery of the present disclosure.

[0025] Description of Reference Numerals

[0026] 10, 20 Batteries

[0027] 11, 21 Laminated film

[0028] 12, 22 Electrode stack

[0029] 13, 23 Rod-shaped buffer member

[0030] 14, 24 collector terminals DETAILED DESCRIPTION

[0031] The following is a detailed description of the embodiments of the present disclosure. However, the present disclosure is not limited to the following embodiments, and can be implemented with various modifications within the scope of the disclosed gist.

[0032] 《Laminate film》

[0033] The laminate film disclosed herein is a laminate film used to seal an electrode stack to produce a battery. The laminate film disclosed herein has rod-shaped cushioning members fixed to positions contacting at least two opposing side surfaces of the side surfaces of the electrode stack.

[0034] As described above, the electrode stack is usually fixed only by the collector tab. Therefore, due to external impact or the like, the stacked structure of the electrode stack may collapse and the collector tab may be damaged.

[0035] In this regard, the inventors of the present application have found that by providing a rod-shaped buffer member for fixing the electrode stack on the side surface of the electrode stack, the electrode stack can be easily fixed, thereby preventing the collector tab from being damaged even if an external impact or the like is applied to the electrode stack.

[0036] The following reference Figure 1 , the laminated film 11 of the present disclosure will be described. It should be noted that the dimensional relationships (length, width, thickness, etc.) in the drawings of the present disclosure do not reflect the actual dimensional relationships.

[0037] Figure 1 It is a schematic perspective view showing an example of an electrode stack 12 and a laminate film 11 of the present disclosure before the electrode stack 12 is sealed.

[0038] The shape of the electrode stack 12 is not particularly limited. Figure 1 As shown, for example, it may have a top portion, a bottom portion opposite to the top portion, and four side portions connecting the top portion and the bottom portion. The laminate film 11 of the present disclosure has a rod-shaped buffer member 13 fixed to a position contacting at least two opposite side portions of the side portions of the electrode stack 12.

[0039] The electrode stack 12 may have a current collecting terminal disposed on the side surface. In this case, the two opposing side surfaces may be provided as side surfaces where no current collecting terminal is disposed.

[0040] The rod-shaped buffer member 13 is not particularly limited as long as it is disposed on at least two opposing side surfaces of the electrode stack 12 when the battery is produced and can fix the electrode stack 12. Examples of the material of the rod-shaped buffer member 13 include resins.

[0041] The position of the rod-shaped buffer member 13 in the laminate film 11 can be appropriately designed in consideration of the size of the electrode stack 12 .

[0042] The method of arranging the rod-shaped cushioning member 13 on the laminate film 11 is not particularly limited, and an example thereof includes a method of bonding with an adhesive or the like.

[0043] The length L of the rod-shaped buffer member 13 in the stacking direction of the electrode stack 12 may be the same as or smaller than the thickness T of the electrode stack 12. With such a configuration, for example, when a plurality of batteries including the laminate film 11 to which the rod-shaped buffer member 13 is fixed are stacked and constrained to form a battery module, the rod-shaped buffer member 13 can be prevented from hindering the pressure equalization (pressing uniformity) of the battery.

[0044] There is no particular limitation on the method for producing the rod-shaped cushioning member 13. For example, when the rod-shaped cushioning member 13 is made of resin, examples thereof include a method of injection molding the resin into a desired size, a method of cutting a flat plate of resin into a desired size, and the like.

[0045] Electrode stack

[0046] The electrode stack of the present disclosure is an electrode stack for producing a battery by sealing with a laminate film. The electrode stack of the present disclosure has rod-shaped buffer members fixed to at least two opposing side surfaces.

[0047] The inventors of the present application have found that the electrode stack can be easily fixed with such a configuration, and thus, even if an external impact or the like is applied to the electrode stack, the collector tab can be prevented from being damaged.

[0048] Figure 2 1 is a schematic perspective view showing an example of the electrode stack 22 of the present disclosure. Figure 2 As shown, the electrode stack 22 of the present disclosure has rod-shaped buffer members 23 fixed to at least two opposing side surfaces.

[0049] Regarding the two opposing side surfaces and the rod-shaped buffer member 23 , reference may be made to the above description regarding the laminate film of the present disclosure.

[0050] The method of arranging the rod-shaped buffer members 23 on the two opposing side surfaces of the electrode stack 22 is not particularly limited, and an example thereof includes a method of bonding with an adhesive or the like.

[0051] In addition, the length of the rod-shaped buffer member 23 in the stacking direction of the electrode stack 22 may be the same as or smaller than the thickness of the electrode stack 22 .

[0052] "Battery"

[0053] Figure 3 1 is a schematic plan view showing an example of a battery of the present disclosure viewed from the stacking direction of the electrode stack. Figure 3 As shown, the battery 10 of the present disclosure includes an electrode stack 12 and a laminate film 11 of the present disclosure that seals the electrode stack 12. In addition, the battery 20 of the present disclosure includes an electrode stack 22 of the present disclosure and a laminate film 21 that seals the electrode stack 22 of the present disclosure.

[0054] In addition, if Figure 3As shown, the battery 10, 20 of the present disclosure may further have a collector terminal 14, 24 electrically connected to the collector foil of the electrode stack 12, 22. There is no particular limitation on the size, shape, etc. of the collector terminal, and the laminate film 11, 21 can seal the collector terminal 14, 24 together with the electrode stack 12, 22. Specifically, the laminate film 11, 21 can wind the electrode stack 12, 22 and the collector terminal 14, 24, and seal the collector terminal 14, 24 together with the electrode stack 12, 22. In addition, the laminate film 11, 21 can be composed of a first and a second film. In this case, the first and the second film can clamp the electrode stack 12, 22 and the collector terminal 14, 24 from the top and bottom of the stacking direction of the electrode stack 12, 22, and seal the electrode stack 12, 22 together with the collector terminal 14, 24.

[0055] The electrode stacks 12 and 22 function as power generation elements of the batteries 10 and 20. The electrode stacks 12 and 22 may include a negative electrode current collector, a negative electrode active material layer, an electrolyte layer, a positive electrode active material layer, and a positive electrode current collector in this order.

[0056] The battery of the present disclosure may be a liquid battery or a solid battery. In addition, with respect to the present disclosure, a "solid battery" refers to a battery that uses at least a solid electrolyte as an electrolyte, and therefore, a solid battery may use a combination of a solid electrolyte and a liquid electrolyte as an electrolyte. In addition, the solid battery of the present disclosure may be an all-solid battery, that is, a battery that uses only a solid electrolyte as an electrolyte.

[0057] The battery of the present disclosure may be a lithium ion secondary battery. As the purpose of the battery, for example, the power supply of vehicles such as hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), electric vehicles (BEV), gasoline vehicles, and diesel vehicles can be listed. In particular, it is preferably used as a driving power supply for hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), or electric vehicles (BEV). In addition, the battery of the present disclosure can be used as a power supply for mobile bodies other than vehicles (such as railways, ships, and aircraft), and can also be used as a power supply for electrical products such as information processing devices.

Claims

1. A laminate film for sealing an electrode laminate to produce a battery, wherein a rod-shaped buffer member is fixed to a position in contact with at least two opposing side surfaces of the side surfaces of the electrode laminate.

2. The laminated film according to claim 1, wherein The length of the rod-shaped buffer member in the stacking direction of the electrode stack is the same as or smaller than the thickness of the electrode stack. 3 . A battery comprising an electrode stack and the laminate film according to claim 1 or 2 which seals the electrode stack.

4. An electrode stack for producing a battery by sealing with a laminate film, wherein rod-shaped buffer members are fixed to at least two opposing side surfaces. 5 . A battery comprising the electrode stack according to claim 4 and a laminate film that seals the electrode stack.

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