Laminate film, electrode laminate, and battery

Abstract

To provide a laminate film which easily makes a multilayer structure of an electrode laminate hard to collapse, an electrode laminate, and a battery comprising the laminate film and the electrode laminate.SOLUTION: A laminate film 11 is configured to generate a battery 10 by sealing an electrode laminate 12. In the laminate film 11, a rod-like buffering member 13 is fixed at a position in contact with at least opposed two side face parts in side face parts of the electrode laminate 12. An electrode laminate 22 is configured to generate a battery 20 by being sealed with a laminate film 21. A rod-like buffering member 23 is fixed on at least opposed two side face parts in the electrode laminate 22. A battery comprises the electrode laminate and the laminate film sealing the electrode laminate and any one of them is an electrode laminate or a laminate film of the present disclosure.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] For example, as disclosed in Patent Document 1, a laminated battery is known that includes an electrode laminate and a current collecting terminal electrically connected to the current collecting foil of the electrode laminate, and the electrode laminate is sealed with a laminate film.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The electrode laminate is usually fixed only by a current collecting tab. Therefore, due to an external impact on the electrode laminate or the like, the laminated structure of the electrode laminate may collapse and the current collecting tab may be damaged.

[0005] An object of the present disclosure is to provide a laminate film and an electrode laminate that can easily prevent the laminated structure of the electrode laminate from collapsing, and a battery including such a laminate film or electrode laminate.

Means for Solving the Problems

[0006] The present inventors have found that the above problems can be solved by the following means. <Aspect 1> A laminate film for generating a battery by sealing an electrode laminate, wherein rod-shaped buffer members are fixed at positions contacting at least two opposing side surfaces among the side surfaces of the electrode laminate. Laminating film. <Aspect 2> The laminate film according to embodiment 1, wherein the length of the rod-shaped buffer member in the stacking direction of the electrode stack is the same as or less than the thickness of the electrode stack. <Aspect 3> Electrode stack, and Laminate film according to embodiment 1 or 2 which seals the electrode laminate A battery equipped with these features. <Aspect 4> An electrode laminate for generating a battery by being sealed with a laminate film, A rod-shaped cushioning member is fixed to at least two opposing side surfaces. Electrode stack. <Aspect 5> The electrode laminate described in Embodiment 4, and Laminate film sealing the electrode stack A battery equipped with these features. [Effects of the Invention]

[0007] According to this disclosure, it is possible to easily provide a laminate film and an electrode laminate that make the laminated structure of the electrode laminate less likely to collapse, as well as a battery equipped with such a laminate film and electrode laminate. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic perspective view showing an example of an electrode stack and the laminate film of this disclosure before sealing the electrode stack. [Figure 2] Figure 2 is a schematic perspective view showing an example of the electrode stack of this disclosure. [Figure 3] Figure 3 is a schematic plan view showing an example of the battery of this disclosure. [Modes for carrying out the invention]

[0009] Hereinafter, embodiments of the present disclosure will be described in detail. Note that the present disclosure is not limited to the following embodiments and can be variously modified and implemented within the scope of the gist of the disclosure.

[0010] 《Laminated Film》 The laminated film of the present disclosure is for generating a battery by sealing an electrode laminate. In the laminated film of the present disclosure, rod-shaped buffer members are fixed at positions contacting at least two opposing side portions among the side portions of the electrode laminate.

[0011] As described above, the electrode laminate is usually fixed only by a current collecting tab. Therefore, due to an external impact or the like, the laminated structure of the electrode laminate may collapse and the current collecting tab may be damaged.

[0012] Regarding this, the present inventors have found that by providing a rod-shaped buffer member for fixing the electrode laminate on the side portion of the electrode laminate, the electrode laminate can be easily fixed, and thereby, even if an external impact or the like is applied to the electrode laminate, breakage of the current collecting tab can be prevented.

[0013] Hereinafter, the laminated film 11 of the present disclosure will be described with reference to FIG. 1. Note that the dimensional relationships (length, width, thickness, etc.) in the drawings of the present disclosure do not reflect actual dimensional relationships.

[0014] FIG. 1 is a schematic perspective view showing an example of the electrode laminate 12 and the laminated film 11 of the present disclosure before sealing the electrode laminate 12.

[0015] The shape of the electrode laminate 12 is not particularly limited, but as shown in FIG. 1, for example, it may have a top surface portion, a bottom surface portion facing the top surface portion, and four side surface portions connecting the top surface portion and the bottom surface portion. In the laminated film 11 of the present disclosure, rod-shaped buffer members 13 are fixed at positions contacting at least two opposing side portions among the side portions of the electrode laminate 12.

[0016] In the electrode laminate 12, a current collector terminal may be disposed on the side surface portion. In this case, the two opposing side surface portions can be the side surface portions where the current collector terminal is not disposed.

[0017] The rod-shaped buffer member 13 is not particularly limited as long as it can be disposed on at least two opposing side surface portions of the side surface portion of the electrode laminate 12 when the battery is produced and can fix the electrode laminate 12. Examples of the material of the rod-shaped buffer member 13 include resin.

[0018] 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 laminate 12.

[0019] The method of disposing the rod-shaped buffer member 13 on the laminate film 11 is not particularly limited. For example, a method of adhering with an adhesive or the like can be mentioned.

[0020] The length L of the rod-shaped buffer member 13 in the stacking direction of the electrode laminate 12 may be the same as or smaller than the thickness T of the electrode laminate 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 disturbing the voltage uniformity of the batteries.

[0021] The method of manufacturing the rod-shaped buffer member 13 is not particularly limited. For example, when the rod-shaped buffer member 13 is resin, a method of injection molding the resin to a desired size, a method of cutting a flat resin to a desired size, etc. can be mentioned.

[0022] 《Electrode Laminate》 The electrode laminate of the present disclosure is for producing a battery by being sealed with a laminate film. In the electrode laminate of the present disclosure, rod-shaped buffer members are fixed to at least two opposing side surface portions.

[0023] The disclosing parties have found that even with this configuration, the electrode stack can be easily fixed, thereby preventing damage to the current collector tabs even if the electrode stack is subjected to external impacts.

[0024] Figure 2 is a schematic perspective view showing an example of the electrode stack 22 of the present disclosure. As shown in Figure 2, the electrode stack 22 of the present disclosure has rod-shaped buffer members 23 fixed to at least two opposing side surfaces.

[0025] For the two opposing side portions and the rod-shaped cushioning member 23, refer to the above description relating to the laminate film of this disclosure.

[0026] The method for arranging the rod-shaped buffer member 23 on two opposing side surfaces of the electrode stack 22 is not particularly limited, but one example is to bond them together with an adhesive.

[0027] Furthermore, the length of the rod-shaped buffer member 23 in the stacking direction of the electrode stack 22 may be the same as or less than the thickness of the electrode stack 22.

[0028] "battery" Figure 3 is a schematic plan view showing an example of a battery of the present disclosure, viewed from the stacking direction of the electrode stack. As shown in Figure 3, the battery 10 of the present disclosure has an electrode stack 12 and a laminate film 11 of the present disclosure that seals the electrode stack 12. The battery 20 of the present disclosure has an electrode stack 22 of the present disclosure and a laminate film 21 that seals the electrode stack 22 of the present disclosure.

[0029] Furthermore, as shown in Figure 3, the batteries 10 and 20 of this disclosure may further have current collector terminals 14 and 24 that are electrically connected to the current collector foils of the electrode stacks 12 and 22. The size, shape, etc., of the current collector terminals are not particularly limited, but the laminate films 11 and 21 may seal the electrode stacks 12 and 22 together with the current collector terminals 14 and 24. Specifically, the laminate films 11 and 21 may be wound around the electrode stacks 12 and 22 and the current collector terminals 40, thereby sealing the electrode stacks 12 and 22 together with the current collector terminals 40. Alternatively, the laminate films 11 and 21 may be composed of first and second films, in which case the first and second films may sandwich the electrode stacks 12 and 22 and the current collector terminals 40 from above and below in the stacking direction of the electrode stacks 12 and 22, thereby sealing the electrode stacks 12 and 22 together with the current collector terminals 40.

[0030] The electrode stacks 12 and 22 function as power generation elements for batteries 10 and 20. The electrode stacks 12 and 22 may have 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.

[0031] The battery in this disclosure may be a liquid-based battery or a solid-state battery. In this disclosure, "solid-state battery" means a battery that uses at least a solid electrolyte as its electrolyte, and therefore a solid-state battery may use a combination of a solid electrolyte and a liquid electrolyte as its electrolyte. Furthermore, the solid-state battery in this disclosure may be an all-solid-state battery, i.e., a battery that uses only a solid electrolyte as its electrolyte.

[0032] The battery in this disclosure may be a lithium-ion secondary battery. Examples of battery applications include powering vehicles such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), battery electric vehicles (BEVs), gasoline cars, and diesel cars. In particular, it is preferable to use it as a power source for hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), or battery electric vehicles (BEVs). Furthermore, the battery in this disclosure may be used as a power source for mobile devices other than vehicles (e.g., railways, ships, aircraft), or as a power source for electrical products such as information processing devices. [Explanation of Symbols]

[0033] 10, 20 batteries 11, 21 Laminating film 12, 22 Electrode stack 13, 23 Rod-shaped cushioning member 14, 24 Current collector terminal

Claims

1. A laminate film for generating a battery by winding and sealing an electrode stack, A rod-shaped buffer member is fixed to the side surface of the electrode stack at a position that is in contact with at least two opposing side surfaces. Laminating film.

2. A laminate film for generating a battery by winding and sealing an electrode stack, A rod-shaped buffer member is fixed to the side surface of the electrode stack to suppress collapse of at least two opposing side surfaces. Laminating film.

3. A laminate film for producing a battery by sealing an electrode stack, A rod-shaped buffer member is fixed to the side surface of the electrode stack at a position that is in contact with at least two opposing side surfaces, and The length of the rod-shaped buffer member in the stacking direction of the electrode stack is smaller than the thickness of the electrode stack. Laminating film.

4. A laminate film for producing a battery by sealing an electrode stack, A rod-shaped buffer member is fixed to the side surface of the electrode stack to suppress collapse of at least two opposing side surfaces, and The length of the rod-shaped buffer member in the stacking direction of the electrode stack is smaller than the thickness of the electrode stack. Laminating film.

5. Electrode stack, and A laminate film according to any one of claims 1 to 4 that seals the electrode laminate. A battery equipped with these features.

6. An electrode laminate for generating a battery by being sealed with a laminate film, A rod-shaped cushioning member is fixed to at least two opposing side surfaces, and The length of the rod-shaped buffer member in the stacking direction of the electrode stack is smaller than the thickness of the electrode stack. Electrode stack.

Images