battery

Abstract

The utility model provides a kind of battery that heat dissipation material is difficult to peel from outer body.Battery has: electrode laminated body;The outer body enclosed electrode laminated body;And the heat dissipation material between the laminated end surface of electrode laminated body and outer body, outer body has opposite inner surface opposite to the laminated end surface of electrode laminated body, the close rate is 85 area% or more, and close rate indicates the proportion of the area of the part of relative inner surface that is in close contact with heat dissipation material relative to the area of relative inner surface.

Description

Technical Field

[0001] This disclosure relates to a battery. Background Technology

[0002] Solid-state batteries are known as lithium-ion secondary batteries with excellent safety.

[0003] Patent Document 1 discloses an all-solid-state battery cell (hereinafter also referred to as a "battery"). This battery is formed by encapsulating an electrode stack within an outer casing material (hereinafter also referred to as a "casing"). The electrode stack has current collectors extending from its ends. The current collectors are connected to terminals extending from the ends of the battery. A first heat transfer material (hereinafter also referred to as a "heat dissipation component") is disposed inside the outer casing in contact with both the electrode stack and the outer casing. The heat dissipation component is arranged such that it covers the end faces of the electrode stack in the stacking direction of the electrode stack.

[0004] Patent Document 1: Japanese Patent No. 7136708.

[0005] However, during battery use, the heat dissipation material may detach from the outer casing. If the heat dissipation material detaches from the outer casing, it becomes difficult to dissipate heat from inside the battery. As a result, adverse conditions may occur (such as shortened battery life). Utility Model Content

[0006] This disclosure was made in view of the above-mentioned actual situation. One embodiment of this disclosure aims to solve the problem of providing a battery in which the heat dissipation material is difficult to peel off from the outer casing.

[0007] The means for solving the above-mentioned problems include the following implementation methods.

[0008] The battery of the first embodiment includes: an electrode stack; an outer casing encapsulated in the electrode stack; and a heat dissipation material disposed between the stacked end face of the electrode stack and the outer casing, the outer casing having an opposing inner surface opposite to the stacked end face of the electrode stack, the contact ratio being 85% or more, the contact ratio representing the ratio of the area of ​​the portion of the opposing inner surface in close contact with the heat dissipation material to the area of ​​the opposing inner surface.

[0009] In the first method, the contact ratio is over 85% of the area. Therefore, the battery of the first method is a battery in which the heat dissipation material is difficult to peel off from the outer casing.

[0010] According to this disclosure, a battery in which the heat dissipation material is difficult to peel off from the outer casing is provided. Attached Figure Description

[0011] Figure 1 This is a perspective view of the battery involved in the embodiments of this disclosure.

[0012] Figure 2 for Figure 1 Sectional view of line II-II.

[0013] Figure 3 This is a diagram illustrating a method for manufacturing a battery according to embodiments of the present disclosure. Detailed Implementation

[0014] In this disclosure, the numerical range represented by "~" refers to the range that includes the values ​​recorded before and after "~" as the minimum and maximum values, respectively. In the numerical ranges recorded in stages in this disclosure, the upper or lower limit value recorded in a certain numerical range can be replaced by the upper or lower limit value of other numerical ranges recorded in stages.

[0015] Embodiments of the battery of this disclosure will now be described with reference to the accompanying drawings. In the drawings, the same or equivalent parts are given the same reference numerals and are not described again.

[0016] The battery 1 in the embodiments of this disclosure is a solid-state battery. For example... Figure 1 As shown, battery 1 has an electrode stack 10, an outer casing 20, and a heat dissipation material (see reference). Figure 2 30. Insulator 31 (refer to) Figure 2 ), 2 negative terminals 41 and 2 positive terminals 42. The electrode stack 10 is a cuboid.

[0017] In this embodiment, the long side direction of the main surface S10A of the electrode stack 10 is defined as the X-axis direction. The short side direction of the main surface S10A of the electrode stack 10 is defined as the Y-axis direction. The thickness direction of the electrode stack 10 is defined as the Z-axis direction. The X-axis, Y-axis, and Z-axis are all orthogonal to each other. The X-axis direction is an example of an axial direction. Note that these directions do not limit the orientation of the battery of this disclosure during use.

[0018] Two negative terminals 41, an electrode stack 10, and two positive terminals 42 are arranged in this order along the positive X-axis. The two negative terminals 41 and two positive terminals 42 are electrically connected to the electrode stack 10. A heat dissipation material 30 is disposed between the stacked end face S10B of the electrode stack 10 and the outer casing 20. An insulator 31 is disposed between the main face S10A of the electrode stack 10 and the outer casing 20. In other words, the heat dissipation material 30 and the insulator 31 cover the electrode stack 10 in a manner that electrically insulates the electrode stack 10 from the outer casing 20. The outer casing 20 is sealed into the electrode stack 10.

[0019] The electrode stack 10 comprises multiple unit electrode bodies 10U. The multiple unit electrode bodies 10U are stacked along the Z-axis direction. The multiple unit electrode bodies 10U are connected in parallel.

[0020] The stacked structure of the unit electrode 10U is a unipolar structure. The unit electrode 10U is formed by stacking the negative electrode current collector 101, the negative electrode active material layer 102, the solid electrolyte layer 103, the positive electrode active material layer 104, the positive electrode current collector 105, the positive electrode active material layer 104, the solid electrolyte layer 103, the negative electrode active material layer 102, and the negative electrode current collector 101 in this order along the Z-axis. The unit electrode 10U can be any known unit electrode (e.g., the unit electrode of a lithium-ion battery or a sodium-ion battery). The stacked end face S10B is formed by the end faces of each layer constituting the unit electrode 10U. Compared to the main surface S10A, the stacked end face S10B more easily transfers heat from the electrode stack 10 to the outer casing 20.

[0021] The outer casing 20 is a metal container. For example... Figure 2 As shown, the outer casing 20 has an inner surface S20 opposite to the stacked end face S10B of the electrode stack 10. In this embodiment, the outer casing 20 is subjected to compression deformation.

[0022] The heat dissipation material 30 electrically insulates the electrode stack 10 from the outer casing 20. The thermally conductive insulator 32A may have a higher thermal conductivity than the insulator 31. The thermal conductivity of the heat dissipation material 30 may be from 1.5 W / (m·K) to 5.0 W / (m·K). The heat dissipation material 30 comprises a known resin (e.g., thermoplastic resin and thermosetting resin) and may contain known thermally conductive fillers. The thickness L30A of the heat dissipation material 30 (refer to...) Figure 2 The diameter can be 0.2mm to 3.8mm, 0.5mm to 3.5mm, or 1.0mm to 3.0mm.

[0023] Insulator 31 electrically insulates electrode laminate 10 from outer casing 20. Insulator 31 comprises a known resin (e.g., thermoplastic resin and thermosetting resin).

[0024] The negative terminal 41 and the positive terminal 42 are used to conduct the electricity generated in the electrode stack 10 to the outside of the battery 1. The negative terminal 41 and the positive terminal 42 can be known terminals.

[0025] In this disclosure, the contact ratio is 85% or more, preferably 90% or more, more preferably 95% or more, and even more preferably 100% of the area. The contact ratio represents the proportion of the area of ​​the portion R30 in close contact with the heat dissipation material 30 on the relative inner surface S20 to the area of ​​the relative inner surface S20 of the outer body 20 (i.e., the portion R20 of the entire relative inner surface S20).

[0026] Methods 1, 2, and 3 can be listed as methods to adjust the close contact rate to 85% or more of the area.

[0027] In the first method, such as Figure 3 As shown, in the D1 direction toward the relative inner surface S20 of the outer body 20 (refer to...) Figure 3 Press the electrode stack 10 onto the outer casing 20 to press the heat dissipation material 30 onto the outer casing 20. The thickness L30B of the heat dissipation material 30 before pressing is shown in the figure. Figure 3 The thickness can be 0.5mm to 4.0mm, 0.8mm to 3.7mm, or 1.7mm to 3.2mm. The compression ratio of the heat dissipation material 30 can be 5% to 60%, 10% to 50%, or 15% to 40%.

[0028] In the second method, such as Figure 3 As shown, the outer casing 20 is formed by pressing the heat dissipation material 30 onto the electrode laminate 10. The forming method of the outer casing 20 is not particularly limited; for example, methods in the D2 direction (see reference...) Figure 3 Methods for compressing and deforming the outer casing 20, etc. The thickness L30B of the heat dissipation material 30 before being pressed (refer to...). Figure 3 The thickness can be 0.5mm to 4.0mm, 0.8mm to 3.7mm, or 1.7mm to 3.2mm. The compression ratio of the heat dissipation material 30 can be 5% to 60%, 10% to 50%, or 15% to 40%.

[0029] In the third method, the electrode stack 10 is placed inside the outer casing 20, and heat dissipation material 30 is injected into the gap between the outer casing 20 and the electrode stack 10. The gap L30B between the outer casing 20 and the electrode stack 10 (refer to...) Figure 3 The diameter can be 0.5mm to 4.0mm, 0.75mm to 3.5mm, or 1.0mm to 3.0mm.

[0030] like Figures 1 to 3 As shown, the battery 1 includes an electrode stack 10, an outer casing 20, and a heat dissipation material 30. The outer casing 20 has a relative inner surface S20. The contact ratio is 85% or more of the area. The contact ratio represents the ratio of the area of ​​the portion R30 in the relative inner surface S20 that is in close contact with the heat dissipation material 30 to the area of ​​the relative inner surface S20.

[0031] Therefore, battery 1 is a battery in which the heat dissipation material 30 is difficult to peel off from the outer casing 20.

[0032] In this embodiment, the outer casing 20 is compressed and deformed by being clamped in the Y-axis direction, but this disclosure is not limited to this. In this disclosure, the outer casing 20 may also be compressed and deformed by being clamped in the Z-axis direction. The outer casing 20 may also not be compressed and deformed. That is, the outer surfaces of the main surface S10A of the electrode stack 10 of the outer casing 20 and the outer surfaces of the four walls opposite to the stack end face S10B may be planes.

[0033] In this embodiment, the battery 1 has an insulator 31, but this disclosure is not limited to this. The battery of this disclosure may not have an insulator 31, and may have a heat dissipation material 30 instead of an insulator 31.

[0034] In this embodiment, the outer casing 20 is a metal container, but this disclosure is not limited thereto. The outer casing 20 may be a stacked outer casing.

Claims

1. A battery, characterized in that, have: Electrode laminate; The outer casing encapsulated within the electrode stack; and Heat dissipation material disposed between the stacked end face of the electrode stack and the outer casing. The outer casing has an inner surface opposite to the stacked end face of the electrode stack. The close contact rate is over 85% of the area. The contact ratio represents the ratio of the area of ​​the portion of the relative inner surface that is in close contact with the heat dissipation material to the area of ​​the relative inner surface.

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