Battery and battery module

Abstract

To provide a battery with improved heat dissipation from an electrode laminate to the outside of the battery.SOLUTION: A battery 10 includes: an electrode laminate 11; and a laminate film 12 sealing the electrode laminate. In the battery, the electrode laminate and the laminate film are directly or indirectly bonded to each other at the side surface part of the electrode laminate. A battery module 100 includes the battery 10.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a battery and a battery module.

Background Art

[0002] As disclosed in Patent Document 1, a battery having an electrode laminate and a laminate film that seals the electrode laminate is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Such a battery may generate heat during charging and discharging, and the battery performance may deteriorate due to this heat generation. Therefore, it is desirable that the heat dissipation from the electrode laminate to the outside of the battery is high.

[0005] An object of the present disclosure is to provide a battery with improved heat dissipation from the electrode laminate to the outside of the battery.

Means for Solving the Problems

[0006] The present inventors have found that the above problems can be solved by the following means. 〈Aspect 1〉 An electrode laminate, and a laminate film that seals the electrode laminate A battery having, wherein the electrode laminate and the laminate film are directly or indirectly joined at a side surface portion of the electrode laminate Battery. 〈Aspect 2〉 A fixing member is disposed on a side surface portion of the electrode laminate, and the electrode laminate and the laminate film are joined via the fixing member. The battery according to Embodiment 1. <Aspect 3> A battery module having the battery according to Embodiment 1 or 2.

Advantages of the Invention

[0007] According to the present disclosure, it is possible to provide a battery with improved heat dissipation from the electrode laminate to the outside of the battery.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. 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. Also, the dimensional relationships in the drawings do not reflect actual dimensional relationships.

[0010] 《Battery》 As illustrated in FIG. 1, the battery 10 of the present disclosure includes an electrode laminate 11 and a laminate film 12 that seals the electrode laminate 11. In the battery 10 of the present disclosure, the electrode laminate 11 and the laminate film 12 are directly or indirectly joined at a side surface portion of the electrode laminate 11.

[0011] As illustrated in FIG. 4, in a battery having an electrode laminate and a laminate film that seals the electrode laminate, usually, the electrode laminate and the laminate film are not joined. As a result, the adhesion between the electrode laminate and the laminate film becomes insufficient. The present inventors have found that in this case, the heat dissipation from the electrode laminate to the outside of the battery may be low.

[0012] Regarding this, as illustrated in FIGS. 1 and 2, the present inventors have found that by directly or indirectly joining the electrode laminate and the laminate film at the side surface portion of the electrode laminate, the adhesion between the electrode laminate and the laminate film can be improved, and as a result, the heat dissipation from the electrode laminate to the outside of the battery can be improved.

[0013] The battery 10 of the present disclosure has an electrode laminate 11 and a laminate film 12 that seals the electrode laminate 11.

[0014] The electrode laminate 11 functions as a power generation element of the battery 10. The electrode laminate 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. The materials of the negative electrode current collector and the positive electrode current collector are not particularly limited as long as they are materials having a current collecting function, and may be, for example, metals such as copper and aluminum. When the materials of the negative electrode current collector and the positive electrode current collector are metals, it becomes easier to directly join the electrode laminate and the laminate film by the method described later.

[0015] The laminate film 12 seals the electrode laminate 11. The laminate film may have a sealant resin layer, a metal layer, and a protective resin layer in this order along the thickness direction. In this case, the laminate film may seal the electrode laminate by heat-sealing the sealant resin layers to each other.

[0016] In the battery 10 of the present disclosure, the electrode laminate 11 and the laminate film 12 are directly or indirectly joined at the side surface portion of the electrode laminate.

[0017] As illustrated in FIG. 1, the electrode laminate 11 and the laminate film 12 may be directly joined at the side surface portion of the electrode laminate 11. In this case, the manufacturing cost can be suppressed, for example, by reducing the number of parts. Further, it can contribute to the improvement of heat dissipation in that heat can be transferred directly from the electrode laminate to the laminate film.

[0018] The method of directly joining the electrode laminate and the laminate film is not particularly limited. For example, when the negative electrode current collector and the positive electrode current collector in the electrode laminate are metals and the laminate film has a sealant resin layer, a method of joining the negative electrode current collector and the positive electrode current collector in the electrode laminate and the sealant resin layer of the laminate film by heat fusion, laser welding, or the like is exemplified.

[0019] As illustrated in FIG. 2, the electrode laminate 11 and the laminate film 12 may be indirectly joined at at least a part of the side surface portion of the electrode laminate 11. For example, a fixing member 13 may be disposed on the side surface portion of the electrode laminate 11, and the electrode laminate 11 and the laminate film 12 may be joined via the fixing member 13. In this case, the adhesion between the electrode laminate 11 and the fixing member 13 and the adhesion between the laminate film 12 and the fixing member 13 are high, and thus, although indirectly, the electrode laminate 11 and the laminate film 12 can be more firmly adhered, which can contribute to the improvement of heat dissipation.

[0020] The fixing member is not particularly limited, but in order to prevent a short circuit with the electrode laminate, it may be an insulating material, and particularly may be an insulating material having high thermal conductivity. Examples of the insulating material include resins. The resin may be a curable resin that is cured by heat or light. Further, the resin may be pre-molded into a rod shape or a plate shape. Examples of the insulating material having high thermal conductivity may be a mixture of a resin and an insulating filler having higher thermal conductivity than the resin. The insulating filler may be a metal oxide. The metal oxide is not particularly limited, but may be, for example, aluminum oxide. Regarding the present disclosure, "insulating" means that the electrical resistivity is 10 8 Ω·cm or more.

[0021] The method of disposing the fixing member on the side surface portion of the electrode laminate is not particularly limited. For example, when the fixing member is a curable resin, a method of applying the raw material of the curable resin to the side surface portion of the electrode laminate and curing it is exemplified. Further, for example, when the fixing member is a resin pre-molded into a rod shape or a plate shape, a method of adhering this resin to the side surface portion of the electrode laminate with an adhesive or the like is exemplified.

[0022] The method of indirectly joining the electrode laminate and the laminate film is not particularly limited. For example, when a fixing member is disposed on the side surface portion of the electrode laminate, a method of joining the fixing member and the sealant resin layer of the laminate film by heat fusion, laser welding, or the like is exemplified.

[0023] The electrode laminate 11 and the laminate film 12 may be joined at at least one side surface portion of the electrode laminate 11. When joined at one side surface portion, the manufacturing cost can be suppressed. Further, as exemplified in FIGS. 1 and 2, the electrode laminate 11 and the laminate film 12 may be joined at two opposing side surface portions of the electrode laminate 11. In this case, the heat dissipation can be further improved.

[0024] As illustrated in FIGS. 1 and 2, the electrode laminate 11 and the laminate film 12 may be joined at at least a part of the side surface portion of the electrode laminate 11. When they are joined at a part, the manufacturing cost can be suppressed. The portion to be joined is not particularly limited, but a portion where the temperature tends to be high, such as near the current collecting terminal, may be selected. Further, the electrode laminate 11 and the laminate film 12 may be joined at the entire side surface portion of the electrode laminate 11. In this case, the heat dissipation can be further improved.

[0025] The battery of the present disclosure may be a solid battery or a liquid-based battery. Regarding the present disclosure, "solid battery" means a battery that uses at least a solid electrolyte as an electrolyte. Therefore, the solid battery may use a combination of a solid electrolyte and a liquid electrolyte as an electrolyte. The solid battery of the present disclosure may particularly be an all-solid battery, that is, a battery that uses only a solid electrolyte as an electrolyte, from the viewpoint of preventing a decrease in the adhesion of the joined portion due to the electrolyte.

[0026] The battery may be a lithium-ion secondary battery. Examples of the use of the battery include power sources for vehicles such as hybrid vehicles (HEV), plug-in hybrid vehicles (PHEV), battery electric vehicles (BEV), gasoline vehicles, and diesel vehicles. In particular, it is preferably used as a driving power source for a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHEV), or a battery electric vehicle (BEV). Further, the battery in the present disclosure may be used as a power source for a moving body other than a vehicle (for example, a railway, a ship, an aircraft), or may be used as a power source for an electric product such as an information processing device.

[0027] Hereinafter, the elements constituting the battery of the present disclosure will be described.

[0028] (Electrode laminate) The shape of the electrode laminate in the plane direction is not particularly limited. 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. The shape of the top surface portion is not particularly limited, and examples thereof include quadrilaterals such as a square, a rectangle, a rhombus, a trapezoid, and a parallelogram. Further, the shape of the top surface portion may be a polygon other than a quadrilateral, or may be a shape having a curve such as a circle. Also, the shape of the bottom surface portion is the same as that of the top surface portion. The shape of the side surface portion is not particularly limited, and examples thereof include quadrilaterals such as a square, a rectangle, a rhombus, a trapezoid, and a parallelogram.

[0029] (Laminated film) As described above, the laminated film may have a sealant resin layer, a metal layer, and a protective resin layer in this order along the thickness direction. Examples of the material of the sealant resin layer include olefin resins such as polypropylene (PP) and polyethylene (PE). Examples of the material of the metal layer include aluminum, aluminum alloy, and stainless steel. Examples of the material of the protective resin layer include polyethylene terephthalate (PET) and nylon.

[0030] The thickness of the sealant resin layer may be 40 μm or more and 100 μm or less. When the electrode laminate and the laminated film are directly joined, for example, in order to prevent a short circuit between the current collector of the electrode laminate and the metal layer of the laminated film, the sealant resin layer may be thickened within a range where the heat dissipation property is not impaired. The thickness of the metal layer may be 30 μm or more and 60 μm or less. The thickness of the protective resin layer may be 20 μm or more and 60 μm or less. The thickness of the laminated film may be 80 μm or more and 250 μm or less.

[0031] (Current collector terminal) As illustrated in FIGS. 1 and 2, the battery of the present disclosure may have a current collector terminal 14 electrically connected to the electrode laminate. The material of the current collector terminal may be the same as that of the negative electrode current collector and the positive electrode current collector, and may particularly be a metal such as copper and aluminum. In this case, since the sealant resin layer of the laminate film and the current collector terminal made of metal can be satisfactorily joined (heat-sealed), the laminate film can seal the electrode laminate together with the current collector terminal. Specifically, the laminate film may seal the electrode laminate by heat-sealing the sealant resin layer and the current collector terminal and by heat-sealing the sealant resin layers to each other.

[0032] The current collector terminal may be disposed on a pair of opposing side portions of the electrode laminate. In this case, the electrode laminate and the laminate film may be joined at a side portion of the electrode laminate where the current collector terminal is not disposed.

[0033] The shape, size, etc. of the current collector terminal are not particularly limited.

[0034] 《Battery Module》 As illustrated in FIG. 3, the battery module 100 of the present disclosure has the battery 10 of the present disclosure.

[0035] As described above, a battery having an electrode laminate and a laminate film that seals the electrode laminate may generate heat during charge and discharge, and the battery performance may deteriorate due to this heat generation. Such a problem is particularly prominent in a battery module formed of a plurality of batteries.

[0036] According to the battery of the present disclosure in which the heat dissipation from the electrode laminate to the outside of the battery is improved, even when a battery module having the same is formed, it is possible to effectively suppress the deterioration of the battery performance due to heat generation.

[0037] The battery module of the present disclosure may be formed by stacking, for example, a plurality of batteries. In this case, at least one of the plurality of batteries may be the battery of the present disclosure, and as illustrated in FIG. 3, all of the plurality of batteries may be the battery of the present disclosure. Note that in FIG. 3, a battery module in which two batteries of the present disclosure are stacked is illustrated, but the number of batteries constituting the battery module is not particularly limited.

[0038] Regarding the battery of the present disclosure, reference can be made to the above description regarding the battery of the present disclosure.

Description of Signs

[0039] 10 Battery 11 Electrode laminate 12 Laminate film 13 Fixing member 14 Current collecting terminal 100 Battery module

Claims

1. An electrode laminate, and A laminate film that seals the electrode laminate A battery having, The electrode laminate and the laminate film are directly or indirectly joined at a side surface portion of the electrode laminate Battery.

2. A fixing member is disposed at a side surface portion of the electrode laminate, and the electrode laminate and the laminate film are joined via the fixing member. The battery according to claim 1.

3. A battery module having the battery according to claim 1 or 2.

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