All-solid-state battery and vehicle

Abstract

The invention provides an all-solid-state battery and a vehicle, which can reduce the possibility of damage caused by external force when the all-solid-state battery is mounted on a vehicle such as an electric vehicle. The all-solid-state battery is provided with a plurality of cells including a plurality of electrode bodies each having a plate-shaped positive electrode, a plate-shaped negative electrode, and a solid electrolyte layer formed between the positive electrode and the negative electrode, the plurality of electrode bodies being integrated into a whole by a coating agent in a state in which linear edges are aligned, the positions of the end surfaces of the coating agent in a direction perpendicular to a plane including the plurality of edges are aligned.

Description

Technical Field

[0001] This invention relates to all-solid-state batteries and vehicles. Background Technology

[0002] In recent years, research and development have been conducted on secondary batteries that contribute to energy efficiency in order to ensure that more people can make proper use of reliable, sustainable, and advanced energy. Secondary batteries are indispensable for vehicles such as electric vehicles. For example, Patent Document 1 discloses technologies related to secondary batteries. The secondary battery manufactured using the manufacturing apparatus disclosed in Patent Document 1 is manufactured by arranging fuel cell cells in a state of suspension on alignment rails.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent No. 2016-157520 Summary of the Invention

[0004] However, in the secondary batteries manufactured using the manufacturing apparatus disclosed in Patent Document 1, when there are dimensional deviations in the various parts of the fuel cell cell, the edges of the various parts sometimes become misaligned. Furthermore, in such cases, external forces are concentrated on the edges that protrude more than others, potentially causing the secondary battery to break. Additionally, when the secondary battery is installed in vehicles such as electric vehicles, it is sometimes subjected to external forces due to collisions with curbs or stones kicked up by the vehicle while driving.

[0005] This invention was made to solve the aforementioned technical problems, and its object is to provide an all-solid-state battery and vehicle that can reduce the possibility of damage due to external forces when installed in electric vehicles and other vehicles. Furthermore, this invention further contributes to improving safety.

[0006] Technical solutions for solving technical problems To achieve the above objectives, the all-solid-state battery according to the embodiments of the present invention comprises multiple cells, each cell including multiple electrode bodies. The multiple electrode bodies have a plate-shaped positive electrode, a plate-shaped negative electrode, and a solid electrolyte layer formed between the positive electrode and the negative electrode. The multiple electrode bodies are integrated into a whole by a coating agent in a straight edge-aligned state, and the end faces of the coating agent are aligned in a direction perpendicular to the plane containing the multiple edges.

[0007] Therefore, the all-solid-state battery according to embodiments of the present invention can be configured such that the end face of the coating agent faces the direction with a high frequency of external forces from impacts such as curbs or stones kicked up by vehicles. Thus, unlike all-solid-state batteries where the edges of the electrode body or the end faces of the coating agent of the individual cells are not aligned, the all-solid-state battery according to embodiments of the present invention can withstand external forces with a surface, reducing the possibility of damage due to external forces. Furthermore, the all-solid-state battery according to embodiments of the present invention avoids the increased manufacturing costs caused by equipping other components to ensure strength against external forces.

[0008] In the all-solid-state battery according to embodiments of the present invention, the coating agent and the plurality of electrode bodies are covered by an outer packaging formed by lamination.

[0009] Therefore, the all-solid-state battery according to the embodiments of the present invention can suppress the movement of the coating agent and multiple electrode bodies, align the end faces of the coating agent, and more reliably maintain the structure of the part where external forces are not excessively concentrated in a specific area.

[0010] The all-solid-state battery according to embodiments of the present invention further comprises: a buffer element sandwiched between the individual cells; an end plate that sandwiches the individual cells and the buffer element in a direction perpendicular to the widest surface of the positive electrode, the negative electrode, or the solid electrolyte layer; and a bind bar that sandwiches a plurality of the individual cells in a direction parallel to the widest surface of the positive electrode, the negative electrode, or the solid electrolyte layer.

[0011] Therefore, in the embodiments of the present invention, the end faces of the coating agent in the all-solid-state battery are aligned, which prevents external forces from being directly applied to the multiple cells arranged in a state where the external forces are not excessively concentrated in a specific area, while firmly maintaining the relationship between the cells. Thus, the all-solid-state battery according to the embodiments of the present invention can prevent external forces from being directly applied to the end faces of the coating agent of each cell, and can further reduce the possibility of damage due to external forces.

[0012] In the all-solid-state battery according to the embodiments of the present invention, the coating agent is an acrylic resin or an epoxy resin.

[0013] Therefore, the end faces of the coating agent of the all-solid-state battery according to the embodiments of the present invention are aligned, and the portion where external force is not excessively concentrated by acrylic resin or epoxy resin is reinforced, which can further reduce the possibility of damage due to external force applied to that portion.

[0014] In the all-solid-state battery according to the embodiments of the present invention, the Young's modulus of the coating agent after curing is 40 MPa or less at a temperature above 0°C and below 40°C.

[0015] Therefore, the end faces of the coating agent of the all-solid-state battery according to the embodiments of the present invention are aligned, and by using a material with an appropriate Young's modulus to reinforce the part where external forces are not excessively concentrated, the possibility of damage due to external forces applied to that part can be further reduced.

[0016] In order to achieve the above objectives, the vehicle according to the embodiments of the present invention is equipped with the all-solid-state battery of the present invention with the end face facing the road surface.

[0017] Therefore, the vehicle according to the embodiments of the present invention can reduce the possibility of damage caused by external forces resulting from collisions between the vehicle and the underside of a curb or from collisions between the vehicle and rocks kicked up during driving. Attached Figure Description

[0018] Figure 1 This is a diagram illustrating an example of an all-solid-state battery involved in an implementation method.

[0019] Figure 2 This is a diagram illustrating an example of the configuration of an all-solid-state battery involved in an implementation method.

[0020] Explanation of reference numerals in the attached figures 1. All-solid-state battery 10 monomers 11 Electrode Body 111 Positive electrode 112 Negative electrode 113 Solid electrolyte layer 12, 13 Coating Agent 14 Outer Packaging 20 Buffer 30 end plate 40 Constraint Clauses 900 pressure head. Detailed Implementation

[0021] Hereinafter, the methods for carrying out the present invention will be described with reference to the accompanying drawings. Figure 1 This is a diagram illustrating an example of an all-solid-state battery involved in an implementation method. Figure 1 The solid-state battery 1 shown is mounted on a vehicle, for example, to enable the tires of an electric vehicle to rotate. Furthermore, the vehicle equipped with the solid-state battery 1 is not limited to four wheels; it can also be two-wheeled, three-wheeled, or similar vehicles.

[0022] like Figure 1 As shown, the all-solid-state battery 1 includes a single cell 10, a buffer 20, an end plate 30, and a constraint strip 40. Furthermore, the single cell 10 in the all-solid-state battery 1 may include, for example, 48 cells. Figure 1As shown, it includes multiple electrode bodies 11, a coating agent 12, a coating agent 13, and an outer packaging 14. It should be noted that in the following description, the term "containing" is used. Figure 1 The X, Y, and Z axes are shown as a right-handed three-dimensional orthogonal coordinate system.

[0023] like Figure 1 As shown, the electrode body 11 includes a positive electrode 111, a negative electrode 112, and a solid electrolyte layer 113. The positive electrode 111 is a plate-shaped electrode, formed in a rectangular shape. The positive electrode 111 includes a plate-shaped current collector foil and a positive electrode active material coated on the current collector foil, and receives Li ions from the solid electrolyte layer 113. The negative electrode 112 is a plate-shaped electrode, formed in a rectangular shape, arranged parallel or substantially parallel to the positive electrode 111 at two locations on the +Z and -Z direction sides of the positive electrode 111. The negative electrode 112 includes a plate-shaped current collector foil and a negative electrode active material coated on the current collector foil, and releases Li ions to the solid electrolyte layer 113. The solid electrolyte layer 113 is formed between the positive electrode 111 and the negative electrode 112 arranged on the +Z direction side of the positive electrode 111, and between the positive electrode 111 and the negative electrode 112 arranged on the -Z direction side of the positive electrode 111.

[0024] It should be noted that the negative electrode 112 may also be disposed only on one of the +Z direction side and the -Z direction side of the positive electrode 111. In addition, when the negative electrode 112 is disposed only on one of the +Z direction side and the -Z direction side of the positive electrode 111, the solid electrolyte layer 113 is formed only on the side where the negative electrode 112 is disposed.

[0025] Furthermore, the electrode bodies 11 included in the monomer 10 are stacked along the Z direction with their straight edges parallel to the Y-axis on the +X direction side misaligned in the X direction and their straight edges parallel to the Y-axis on the -X direction side aligned in the X direction. This is because there are dimensional deviations in the X direction among the individual electrode bodies 11. It should be noted that, for example... Figure 1 The method of stacking the electrode bodies 11 in the monomer 10 as shown is not particularly limited. Furthermore, a monomer 10 may contain, for example, 27 electrode bodies 11. Alternatively, a monomer 10 may contain, for example, 30, 50, or 100 electrode bodies 11.

[0026] The coating agent 12 is adhered to the linear edge of each electrode body 11 on the -X direction side, parallel to the Y-axis, and around that edge, thereby integrating the electrode bodies 11 included in the monomer 10 into a single unit. Furthermore, the end faces E of the coating agent 12 included in the monomer 10 are aligned in the direction perpendicular to the plane containing the edges of the plurality of electrode bodies 11, i.e., in the X direction. That is, the end faces E of the coating agent 12 included in the monomer 10 are all disposed on a plane P parallel to the YZ plane. The coating agent 13 is adhered to the linear edge of each electrode body 11 on the +X direction side, parallel to the Y-axis, and around that edge, thereby integrating the electrode bodies 11 included in the monomer 10 into a single unit. It should be noted that the monomer 10 may also be without the coating agent 13.

[0027] Preferably, at least one of coating agent 12 and coating agent 13 is an acrylic resin or an epoxy resin. Furthermore, it is preferred that at least one of coating agent 12 and coating agent 13 has a Young's modulus of 40 MPa or less after curing at a temperature between 10°C and 25°C. Moreover, it is preferred that at least one of coating agent 12 and coating agent 13 has a viscosity of 1 Pa·s or more and 150 Pa·s or less before curing.

[0028] The outer packaging 14 covers the surface of the coating agent 13 on the +X direction side, the surface of the coating agent 12 on the -X direction side, and also covers the surfaces of the electrode body 11, coating agent 12, and coating agent 13 contained in the monomer 10 on the +Y, -Y, +Z, and -Z directions side. The outer packaging 14 is formed, for example, by lamination, to vacuum seal the electrode body 11, coating agent 12, and coating agent 13. Thus, the outer packaging 14 applies a pressure of 0.1 MPa to the electrode body 11, coating agent 12, and coating agent 13, preventing them from moving.

[0029] Buffer elements 20 are sandwiched between cells 10. End plates 30 clamp multiple cells 10 and multiple buffer elements 20 in a direction perpendicular to the widest surface of the positive electrode 111, negative electrode 112, or solid electrolyte layer 113, i.e., the Z direction. Thus, the end plates 30 apply a pressure of, for example, 1.5 MPa to the cells 10 and buffer elements 20 contained in the all-solid-state battery 1. Constraint strips 40 clamp multiple cells 10 in a direction parallel to the widest surface of the positive electrode 111, negative electrode 112, or solid electrolyte layer 113, for example, the X direction.

[0030] Figure 2 This is a diagram illustrating an example of the configuration of an all-solid-state battery involved in an implementation method. Figure 2The indenter 900 shown is used for crush tests, simulating a curb or a rock kicked up by a vehicle while it is in motion, which collide with the all-solid-state battery 1 installed in an electric vehicle or other vehicle. During the crush test, the indenter 900 is pressed against the end face E of the all-solid-state battery 1 where the coating agent 12 is disposed, thereby applying an external force to that surface of the all-solid-state battery 1.

[0031] The all-solid-state battery 1 is mounted on the vehicle with the end face E of each cell 10 facing the direction from which the indenter 900 collides. That is, the all-solid-state battery 1 is mounted on the vehicle with the end face E of each cell 10 facing the road surface. Alternatively, the all-solid-state battery 1 may also be included in an intelligent power unit (IPU) mounted on the vehicle.

[0032] The all-solid-state battery and vehicle according to the embodiments have been described above. The all-solid-state battery 1 includes a plurality of cells 10 with the end faces E of the coating agent 12 aligned in the X direction. Each cell 10 includes a plurality of electrode bodies 11. Each electrode body 11 has a plate-shaped positive electrode 111, a plate-shaped negative electrode 112, and a solid electrolyte layer 113 formed between the positive electrode 111 and the negative electrode 112. In addition, the electrode bodies 11 included in the cell 10 are fixed to each other by the coating agent 12 in a state where their edges are aligned in a straight line parallel to the Y direction.

[0033] Therefore, the all-solid-state battery 1 can be configured such that the end face E of the coating agent 12 faces the direction with a high frequency of external forces from impacts such as curb stones or stones kicked up by vehicles. Thus, unlike all-solid-state batteries where the end face of the coating agent of a portion of the electrode or individual cell protrudes towards the -X direction, the all-solid-state battery 1 can withstand external forces with a surface, reducing the possibility of damage due to external forces. Furthermore, the all-solid-state battery 1 avoids the increased manufacturing costs associated with equipping other components to ensure strength against external forces.

[0034] In addition, coating agent 12, coating agent 13 and multiple electrode bodies 11 are covered by an outer packaging 14 formed by lamination.

[0035] Therefore, the all-solid-state battery 1 can suppress the movement of the coating agent 12, the coating agent 13 and the multiple electrode bodies 11, and align the position of the end face E of the coating agent 12, so as to more reliably maintain the structure of the part where the external force is not excessively concentrated in a specific part.

[0036] Additionally, the all-solid-state battery 1 includes a buffer 20, an end plate 30, and a restraining strip 40. The buffer 20 is sandwiched between the individual cells 10. The end plate 30 clamps the individual cells 10 and the buffer 20 in a direction perpendicular to the widest surface of the positive electrode 111, negative electrode 112, or solid electrolyte layer 113. The restraining strip 40 clamps multiple individual cells in a direction parallel to the widest surface of the positive electrode 111, negative electrode 112, or solid electrolyte layer 113.

[0037] Therefore, in the all-solid-state battery 1, the end faces E of the coating agent 12 are aligned, which prevents external forces from being directly applied to the multiple cells 10 arranged in a state where the external forces are not excessively concentrated in a specific area, and firmly maintains the relationship between the cells 10. Thus, the all-solid-state battery 1 can prevent external forces from being directly applied to the end faces E of the coating agent 12 of each cell 10, and can further reduce the possibility of damage due to external forces.

[0038] In addition, in the all-solid-state battery 1, at least one of the coating agents 12 is an acrylic resin or an epoxy resin.

[0039] Therefore, in the all-solid-state battery 1, the end face E of the coating agent 12 is aligned. By using acrylic resin or epoxy resin to reinforce the part where the external force is not excessively concentrated, the possibility of damage due to the external force applied to that part can be further reduced.

[0040] In addition, in the all-solid-state battery 1, the coating agent 12 has a Young's modulus of less than 40 MPa after curing at a temperature of 10°C or higher and 25°C or lower.

[0041] Therefore, the end face E of the coating agent 12 of the all-solid-state battery 1 is aligned, and the part where the external force is not excessively concentrated by the material with appropriate Young's modulus is reinforced, which can further reduce the possibility of damage due to the external force applied to that part.

[0042] In addition, in the all-solid-state battery 1, the viscosity of the coating agent 12 before curing is above 1 Pa·s and below 150 Pa·s.

[0043] Therefore, the all-solid-state battery 1 can make the edges of the electrode bodies easier to align by using a coating agent 12 with a suitable viscosity. As a result, the all-solid-state battery 1 can improve the positional accuracy of the edges of each electrode body 11 and increase the degree to which external forces are not excessively concentrated in specific areas.

[0044] The vehicle involved in the implementation method is equipped with the aforementioned all-solid-state battery 1 with its end face E facing the road surface.

[0045] Therefore, the vehicle according to the embodiment has its end face E of the coating agent 12 facing a direction with a high frequency of external forces from collisions with curbs, stones kicked up during driving, etc., which can reduce the possibility of the all-solid-state battery 1 being damaged by external forces.

[0046] The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the embodiments described above. That is, the present invention includes various modifications, substitutions, design changes, etc., implemented based on the spirit of the present invention, and these embodiments are not excluded.

Claims

1. An all-solid-state battery, characterized in that, The all-solid-state battery comprises multiple cells, each cell containing multiple electrode bodies. Each electrode body has a plate-shaped positive electrode, a plate-shaped negative electrode, and a solid electrolyte layer formed between the positive electrode and the negative electrode. The multiple electrode bodies are integrated into a whole by a coating agent in a straight edge-aligned state, and the end faces of the coating agent are aligned in a direction perpendicular to the plane containing the multiple edges.

2. The all-solid-state battery according to claim 1, wherein, The coating agent and the plurality of electrode bodies are covered by an outer packaging formed by lamination.

3. The all-solid-state battery according to claim 1, wherein, The all-solid-state battery further features: A buffer element sandwiched between the monomers; An end plate, which clamps the monomer and the buffer in a direction perpendicular to the widest surface of the positive electrode, the negative electrode, or the solid electrolyte layer; and A constraint strip, which clamps a plurality of the monomers in a direction parallel to the widest surface of the positive electrode, the negative electrode, or the solid electrolyte layer.

4. The all-solid-state battery according to claim 1, wherein, The coating agent is acrylic resin or epoxy resin.

5. The all-solid-state battery according to claim 1, wherein, The cured Young's modulus of the coating agent is below 40 MPa at a temperature above 0°C and below 40°C.

6. A vehicle, characterized in that, The all-solid-state battery according to any one of claims 1 to 5 is mounted with the end face facing the road surface side.

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