阅读说明：本技术 电池模块、电池组和交通工具 (Battery module, battery pack, and vehicle ) 是由 筒井靖贵 于 2019-06-14 设计创作，主要内容包括：本公开提供一种能够抑制液体电池模块的延烧的电池模块。电池模块(100)具备液体电池模块(10)和固体电池模块(20)。固体电池模块(20)比液体电池模块(10)大。根据本公开的一技术方案,可实现能够抑制液体电池模块的延烧的高可靠性的电池模块。(The present disclosure provides a battery module capable of suppressing the burn-up of a liquid battery module. A battery module (100) is provided with a liquid battery module (10) and a solid battery module (20). The solid battery module (20) is larger than the liquid battery module (10). According to one aspect of the present disclosure, a highly reliable battery module can be realized that can suppress the burn-up of the liquid battery module.)

1. A battery module comprising a 1 st liquid battery module and a 1 st solid battery module,

the 1 st solid battery module has a larger volume than the 1 st liquid battery module.

2. The battery module as set forth in claim 1,

the 1 st liquid battery module and the 1 st solid battery module are rectangular parallelepipeds or cubes.

3. The battery module according to claim 1 or 2,

the 1 st solid-state battery module is disposed in contact with the 1 st liquid-state battery module.

4. The battery module according to any one of claims 1 to 3, further comprising a 2 nd solid-state battery module,

the 2 nd solid battery module has a larger volume than the 1 st liquid battery module,

the 1 st liquid battery module is disposed between the 1 st solid battery module and the 2 nd solid battery module.

5. The battery module as set forth in claim 4,

the 2 nd solid battery module is in the shape of a cuboid or a cube.

6. The battery module according to claim 4 or 5,

the 2 nd solid-state battery module is disposed in contact with the 1 st liquid-state battery module.

7. The battery module according to any one of claims 4 to 6, further comprising a battery case,

the battery case accommodates the 1 st liquid battery module, the 1 st solid battery module, and the 2 nd solid battery module,

the 1 st solid battery module, the 2 nd solid battery module and the battery case define an enclosed space,

the 1 st liquid battery module is disposed in the closed space.

8. The battery module as set forth in claim 7,

the battery case has an inner surface and,

the 1 st solid battery module has a main surface opposite to the 1 st liquid battery module and a side surface in contact with the inner surface of the battery case,

the 2 nd solid battery module has a main surface opposite to the 1 st liquid battery module and a side surface in contact with the inner surface of the battery case,

the 1 st liquid battery module is disposed in a closed space surrounded by the main surface of the 1 st solid battery module, the main surface of the 2 nd solid battery module, and the inner surface of the battery case.

9. The battery module according to any one of claims 1 to 8,

the 1 st liquid battery module has a main face and at least one side face,

the 1 st solid battery module covers the main face and the at least one side face of the 1 st liquid battery module.

10. The battery module according to any one of claims 1 to 9, further comprising a No. 3 solid-state battery module,

the 1 st liquid battery module has a main face and at least one side face,

the 1 st solid battery module covers the main face of the 1 st liquid battery module,

the 3 rd solid battery module covers the at least one side of the 1 st liquid battery module.

11. The battery module as set forth in claim 10,

the 3 rd solid battery module is in the shape of a cuboid or a cube.

12. The battery module according to any one of claims 1 to 11,

the 1 st liquid battery module contains more liquid battery cells containing an electrolyte solution containing an organic substance than the 1 st solid battery module,

the 1 st solid-state battery module includes more solid-state battery cells having a solid electrolyte than the 1 st liquid-state battery module.

13. The battery module as set forth in claim 12,

the 1 st solid battery module does not contain the liquid battery cell.

14. The battery module according to claim 12 or 13,

the 1 st liquid battery module does not contain the solid battery cell.

15. The battery module according to any one of claims 1 to 14, further comprising a No. 2 liquid battery module,

the 1 st solid-state battery module is disposed between the 1 st liquid battery module and the 2 nd liquid battery module.

16. The battery module as set forth in claim 15,

the 2 nd liquid battery module is in the shape of a cuboid or a cube.

17. The battery module according to claim 15 or 16,

the 2 nd liquid battery module is disposed in contact with the 1 st solid battery module.

18. A vehicle comprising the battery module according to any one of claims 1 to 17 and a motor driven by electric power from the battery module.

19. A battery pack comprising a 1 st liquid battery module and a 1 st solid battery module,

the 1 st solid battery module has a larger volume than the 1 st liquid battery module.

Technical Field

The present disclosure relates to a battery module having a hybrid structure of a liquid battery module and a solid battery module.

Background

Patent documents 1 and 2 disclose a structure in which liquid batteries and all-solid batteries are alternately arranged.

Patent document 1: japanese patent No. 4075487

Patent document 2: japanese laid-open patent publication (JP 2015-125919)

Disclosure of Invention

The problem to be solved by the present invention is that in a battery module including a liquid battery module and an all-solid battery module, one liquid battery module may ignite and cause other liquid battery modules to burn.

The present disclosure provides a battery module capable of suppressing the burn-up of a liquid battery module.

A battery module according to an aspect of the present disclosure includes a 1 st liquid battery module and a 1 st solid battery module having a larger volume than the 1 st liquid battery module. The general or specific aspects of the disclosure may be implemented by a battery, a vehicle, a device, a system, a method, or any combination thereof.

According to one aspect of the present disclosure, a highly reliable battery module can be realized that can suppress the burn-up of the liquid battery module.

Drawings

Fig. 1A is a schematic cross-sectional view of the battery module according to embodiment 1 cut along a plane parallel to the Z-X plane.

Fig. 1B is a schematic cross-sectional view of the battery module according to embodiment 1 taken on a plane parallel to the X-Y plane.

Fig. 1C is a schematic cross-sectional view of the battery module according to embodiment 1 taken on a plane parallel to the Y-Z plane.

Fig. 2A is a schematic cross-sectional view of the battery module according to embodiment 2 cut along a plane parallel to the Z-X plane.

Fig. 2B is a schematic cross-sectional view of the battery module according to embodiment 2 taken on a plane parallel to the X-Y plane.

Fig. 2C is a schematic cross-sectional view of the battery module according to embodiment 2 taken on a plane parallel to the Y-Z plane.

Fig. 3A is a schematic cross-sectional view of the battery module according to embodiment 3 cut along a plane parallel to the Z-X plane.

Fig. 3B is a schematic cross-sectional view of the battery module according to embodiment 3 taken on a plane parallel to the X-Y plane.

Fig. 3C is a schematic cross-sectional view of the battery module according to embodiment 3 taken on a plane parallel to the Y-Z plane.

Fig. 4 is a schematic cross-sectional view of a battery module according to modification 1 of embodiment 3, taken on a plane parallel to the Z-X plane.

Fig. 5 is a schematic cross-sectional view of a battery module according to modification 2 of embodiment 3, taken on a plane parallel to the Z-X plane.

Fig. 6 is an explanatory diagram showing a schematic configuration of a vehicle according to embodiment 4.

Description of the reference numerals

10 liquid battery module

20. 22, 22a, 22b solid-state battery module

30 Battery case

100. 101, 102a, 102b, 162 battery module

161 electric motor

160 vehicle

163 wheel

Detailed Description

(insight underlying the present disclosure)

Liquid batteries using an electrolytic solution or a gel electrolyte composed of an electrolytic solution and a polymer compound are easily combustible. Therefore, if a plurality of liquid batteries are arranged adjacent to each other, there is a possibility that ignition may occur. On the other hand, batteries using solid electrolytes are difficult to burn because they do not use electrolytic solutions or gel-like electrolytes.

Patent documents 1 and 2 disclose a structure in which a liquid battery and an all-solid battery are alternately arranged. With this configuration, it is possible to provide a battery module having high safety without providing a safety device set for a liquid battery. However, in general, in a battery module, a liquid battery and an all-solid battery are housed in a battery case, and a space through which air flows is present around the liquid battery and the all-solid battery. Thus, in the case where one liquid battery is on fire, the fire may extend beyond the all-solid battery to other liquid batteries with the flow of air.

In view of the above problem, a battery module according to one aspect of the present disclosure includes a 1 st liquid battery module and a 1 st solid battery module, and the 1 st solid battery module is larger than the 1 st liquid battery module.

Thus, even if the 1 st liquid battery module is on fire, the 1 st solid battery module serves as a barrier, and the spread of fire from other liquid battery modules is unlikely to occur. That is, a highly reliable battery module can be realized. The 1 st solid battery module may be a battery module having a larger volume than the 1 st liquid battery module. The 1 st solid-state battery module and the 1 st liquid-state battery module may or may not be in contact with each other. For example, there may be a space between the 1 st solid battery module and the 1 st liquid battery module. A plurality of solid battery modules including the 1 st solid battery module may be arranged in series. A plurality of liquid battery modules including the 1 st liquid battery module may be arranged in series. The 1 st solid battery module may be provided with an inorganic solid electrolyte, or may be provided with an organic solid electrolyte. The shape of the 1 st solid battery module is not particularly limited. For example, the shape of the 1 st solid-state battery module may be a cube, a rectangular parallelepiped, or a cylinder. The shape of the 1 st liquid battery module is not particularly limited. For example, the shape of the 1 st liquid battery module may be a cube, a rectangular parallelepiped, or a cylinder.

For example, the battery pack further includes a 2 nd solid-state battery module, the 2 nd solid-state battery module being disposed in contact with the 1 st liquid-state battery module, the 2 nd solid-state battery module being larger than the 1 st liquid-state battery module, and the 1 st liquid-state battery module being sandwiched between the 1 st solid-state battery module and the 2 nd solid-state battery module.

Thus, even if the 1 st liquid battery module is on fire, the 1 st solid-state battery module and the 2 nd solid-state battery module sandwiching the 1 st liquid battery module become barriers, and ignition of the other liquid battery modules is less likely to occur. That is, a highly reliable battery module can be realized. Further, the 2 nd solid-state battery module may be a battery module having a larger volume than the 1 st liquid-state battery module. The 2 nd solid battery module may be in contact with the 1 st liquid battery module. For example, a space may exist between the 2 nd solid battery module and the 1 st liquid battery module. A plurality of solid battery modules including the 2 nd solid battery module may be arranged in series. The 2 nd solid battery module may be provided with an inorganic solid electrolyte, or may be provided with an organic solid electrolyte. The shape of the 2 nd solid battery module is not particularly limited. For example, the 2 nd solid-state battery module may be in the shape of a cube, a rectangular parallelepiped, or a cylinder.

For example, the battery pack may further include a battery case that houses the 1 st liquid battery module, the 1 st solid battery module, and the 2 nd solid battery module, wherein a side surface of the 1 st solid battery module and a side surface of the 2 nd solid battery module are in contact with an inner surface of the battery case, and the 1 st liquid battery module is disposed in a closed space surrounded by a main surface of the 1 st solid battery module, the main surface of the 2 nd solid battery module, and the inner surface of the battery case.

Thus, since the 1 st liquid battery module is disposed in the closed space, if the 1 st liquid battery module is on fire, it is difficult for ignition of another liquid battery module to occur. That is, a highly reliable battery module can be realized.

For example, the 1 st solid-state battery module covers a main surface and a side surface of the 1 st liquid-state battery module.

Thus, the main surface and the side surfaces of the 1 st liquid battery module are covered with the 1 st solid battery module which is less likely to ignite, and therefore, when the 1 st liquid battery module ignites, ignition of another liquid battery module is less likely to occur. That is, a highly reliable battery module can be realized.

For example, the battery pack further includes a 3 rd solid-state battery module, wherein the 1 st solid-state battery module covers a main surface of the 1 st liquid-state battery module, and the 3 rd solid-state battery module covers a side surface of the 1 st liquid-state battery module.

Thus, the main surface and the side surfaces of the 1 st liquid battery module are covered with the 1 st solid battery module and the 3 rd solid battery module, which are less likely to cause fire, and therefore, when the 1 st liquid battery module is fired, burning of the other liquid battery modules is less likely to occur. That is, a highly reliable battery module can be realized.

For example, the 1 st liquid battery module includes more liquid battery cells including an electrolyte solution containing an organic substance than the 1 st solid battery module, and the 1 st solid battery module includes more solid battery cells including a solid electrolyte than the 1 st liquid battery module.

Thus, even if the 1 st liquid battery module is ignited, the 1 st solid battery module that is difficult to ignite because it contains a large amount of solid electrolyte becomes a barrier, and ignition of the other liquid battery modules is difficult to occur. That is, a highly reliable battery module can be realized.

In addition, for example, the 1 st solid battery module does not include the liquid battery cell.

Thus, even if the 1 st liquid battery module is ignited, the 1 st solid battery module which is difficult to ignite because it does not contain the electrolyte becomes a barrier, and ignition of the other liquid battery modules is difficult to occur. That is, a highly reliable battery module can be realized.

In addition, for example, the 1 st liquid battery module does not include the solid battery module.

As a result, when the 1 st liquid battery module containing no solid electrolyte is ignited, the spread of fire of the other liquid battery modules is less likely to occur. That is, a highly reliable battery module can be realized.

For example, the battery module further includes a 2 nd liquid battery module, and the 1 st solid-state battery module is disposed between the 1 st liquid battery module and the 2 nd liquid battery module in contact with the 1 st liquid battery module and the 2 nd liquid battery module.

As a result, even if the 1 st liquid battery module catches fire, the 1 st solid battery module serves as a barrier, and the 2 nd liquid battery module is less likely to suffer from ignition. That is, a highly reliable battery module can be realized. Further, the 2 nd liquid battery module may be a single cell module. The 1 st solid state battery module may not be in contact with the 2 nd liquid battery module. For example, there may be a space between the 1 st solid battery module and the 2 nd liquid battery module. A plurality of liquid battery modules including the 2 nd liquid battery module may be arranged in series. The shape of the 2 nd liquid battery module is not particularly limited. For example, the 2 nd liquid battery module may be in the shape of a cube, a rectangular parallelepiped, or a cylinder.

Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below all represent general or specific examples. The numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, steps, order of steps, and the like shown in the following embodiments are merely examples, and do not limit the present invention. Among the components of the following embodiments, components not described in the independent claims representing the uppermost concept will be described as arbitrary components.

The drawings are schematic and are not necessarily strictly illustrated. In the drawings, substantially the same components are denoted by the same reference numerals, and redundant description is omitted or simplified.

In the drawings for explanation in the following embodiments, coordinate axes may be shown. The X-axis direction of the coordinate axes is, for example, described as the thickness direction of the solid-state battery module and the liquid-state battery module. The Y-axis direction is defined as the width direction of the solid-state battery module and the liquid-state battery module, and the Z-axis direction is defined as the length direction of the solid-state battery module and the liquid-state battery module. The surfaces of the solid-state battery module and the liquid-state battery module parallel to the Y-Z plane are referred to as principal surfaces. In other words, the main surface is an upper surface or a lower surface. The main surface is, for example, one of the largest pair of surfaces. The surfaces other than the main surfaces of the solid-state battery module and the liquid-state battery module are referred to as side surfaces.

(embodiment mode 1)

[ Structure ]

Hereinafter, the structure of the battery module according to embodiment 1 will be described with reference to the drawings. Fig. 1A is a schematic cross-sectional view of the battery module according to embodiment 1 cut along a plane parallel to the Z-X plane. Fig. 1B is a schematic cross-sectional view of the battery module according to embodiment 1 taken along a plane parallel to the X-Y plane. Fig. 1C is a schematic cross-sectional view of the battery module according to embodiment 1 taken on a plane parallel to the Y-Z plane.

As shown in fig. 1A to 1C, a battery module 100 according to embodiment 1 includes a plurality of liquid battery modules 10, a plurality of solid battery modules 20, and a battery case 30. The battery module 100 may include at least one liquid battery module 10 and at least one solid battery module 20. The number of liquid battery modules 10 and the number of solid battery modules 20 included in the battery module 100 are not particularly limited.

The liquid battery module 10 is an example of the 1 st liquid battery module and the 2 nd liquid battery module, and contains an electrolyte (electrolytic solution) of a liquid containing an organic substance or a gel-like electrolyte made of a polymer compound in an amount larger than that of the solid battery module 20. In other words, the liquid battery module 10 includes more liquid battery cells including an organic matter-containing electrolytic solution or a gel electrolyte made of a polymer compound than the solid battery module 20. As the electrolytic solution, for example, a solution obtained by dissolving an electrolyte in a solvent made of an organic substance is used. As the organic material used for the solvent, a generally known organic solvent material for a battery electrolyte can be used. As the electrolyte, a generally known electrolyte material for a battery electrolyte can be used. Further, the liquid cell module 10 may be completely free of any solid electrolyte. That is, the liquid battery module 10 may not contain a solid battery cell.

The liquid battery module 10 has a flat rectangular parallelepiped shape (rectangular plate shape) with the X-axis direction as the thickness direction. The dimensions of the liquid cell module 10 are, for example: the length in the Z-axis direction (longitudinal direction) was about 300mm, the length in the X-axis direction (thickness direction) was about 68mm, and the length in the Y-axis direction (width direction) was about 222 mm. The liquid battery 10 may have other shapes and sizes.

The solid-state battery module 20 is an example of the 1 st solid-state battery module and the 2 nd solid-state battery module, and contains a larger amount of solid electrolyte than the liquid-state battery module 10. In other words, the solid-state battery module 20 includes more solid-state battery cells having a solid electrolyte than the liquid-state battery module 10. As the solid electrolyte, for example, a generally known solid electrolyte material for a battery can be used. The solid electrolyte may be inorganic or organic. Further, the solid-state battery module 20 may be an all-solid-state battery module that does not contain any liquid electrolyte at all. That is, the solid battery module 20 may not contain a liquid battery module.

The solid-state battery module 20 has a flat rectangular parallelepiped shape (rectangular plate shape) with the X-axis direction as the thickness direction. The dimensions of the solid battery module 20 are, for example: the length in the Z-axis direction (longitudinal direction) was about 420mm, the length in the X-axis direction (thickness direction) was about 50mm, and the length in the Y-axis direction (width direction) was about 300 mm. That is, the solid battery module 20 has a larger outer shape (volume) than the liquid battery module 10. The solid battery module 20 may have other shapes and sizes as long as it has a larger volume than the liquid battery module 10.

The liquid battery module 10 and the solid battery module 20 may be respectively realized, for example, by: a laminate composed of a positive electrode layer, a negative electrode layer, and an electrolyte layer was sealed in an outer package to obtain a battery cell, and the battery cell was further laminated and sealed in an outer package. That is, the liquid battery module 10 and the solid battery module 20 each include a plurality of battery cells (liquid battery cells or solid battery cells) that are electrically connected. Each of the liquid battery module 10 and the solid battery module 20 may be specifically realized as a lithium secondary battery module, for example.

A liquid battery module is a battery that contains more electrolyte (electrolytic solution) of a liquid containing organic substances than a solid battery module. As the electrolytic solution, for example, a solution obtained by dissolving an electrolyte in a solvent made of an organic substance can be used. As the organic material used for the solvent, a generally known organic solvent material for a battery electrolyte can be used. As the electrolyte, a generally known electrolyte material for a battery electrolyte can be used. Furthermore, the liquid battery module may be completely free of any solid electrolyte. The liquid battery module may be a single cell.

The liquid battery module has a flat rectangular parallelepiped shape (rectangular plate shape) with the X-axis direction as the thickness direction. The dimensions of the liquid battery module are, for example: the length in the Z-axis direction (longitudinal direction) was about 26.5mm, the length in the X-axis direction (thickness direction) was about 1mm, and the length in the Y-axis direction (width direction) was about 148 mm. The liquid battery cell may also be of other shapes and sizes.

A solid cell is a battery that contains more solid electrolyte than a liquid cell. The solid battery cell is, for example, an all-solid battery completely free of any liquid electrolyte. As the solid electrolyte, for example, a generally known solid electrolyte material for a battery can be used. The solid electrolyte may be inorganic or organic. The solid battery cell may be a single cell.

The solid battery cell is a flat rectangular parallelepiped (rectangular plate shape) having the X-axis direction as the thickness direction. The dimensions of the solid battery cell are, for example: the length in the Z-axis direction (longitudinal direction) was about 32.5mm, the length in the X-axis direction (thickness direction) was about 1mm, and the length in the Y-axis direction (width direction) was about 154 mm. That is, the solid battery cell has a larger outer shape (volume) than the liquid battery cell. The solid battery cell may have other shapes and sizes.

Although not shown in detail, the liquid battery cell and the solid battery cell each include a positive electrode layer and a negative electrode layer in addition to an electrolyte layer containing an electrolyte (electrolytic solution). The electrolyte layer is disposed between the positive electrode layer and the negative electrode layer.

The positive electrode layer contains a positive electrode active material capable of occluding and releasing metal ions (e.g., lithium ions). As the positive electrode active material, a generally known active material for a battery positive electrode can be used.

The negative electrode layer contains a negative electrode active material capable of occluding and releasing metal ions (e.g., lithium ions). As the negative electrode active material, a generally known active material for a battery negative electrode can be used.

The battery case 30 is a hollow casing that houses the plurality of liquid battery modules 10 and the plurality of solid battery modules 20 therein. The battery case 30 has a substantially rectangular parallelepiped shape. The battery case 30 may be formed of a metal material or a resin material.

[ arrangement of liquid Battery Module and solid Battery Module ]

In the battery case 30, the plurality of liquid battery modules 10 and the plurality of solid battery modules 20 are alternately arranged so that main surfaces thereof are in contact with each other. That is, the solid-state battery module 20 is disposed in contact with the liquid-state battery module 10. For example, one liquid battery module 10 is sandwiched between two solid battery modules 20. One solid battery module 20 is disposed in contact with the two liquid battery modules 10 between the two liquid battery modules 10. Further, at least a part of the plurality of liquid cell modules 10 may be arranged in series. That is, two or more liquid battery modules 10 may be sandwiched by two solid battery modules 20, or two or more liquid battery modules 10 may be arranged in series at the ends of a battery module row. In addition, at least a part of the plurality of solid battery modules 20 may be arranged in series. That is, two or more solid battery modules 20 may be sandwiched by two liquid battery modules 10, or two or more solid battery modules 20 may be arranged in series at the end of a battery module row. At least one of the liquid battery modules 10 may not be in contact with the solid battery module 20. A support member for supporting the plurality of liquid battery modules 10 and the plurality of solid battery modules 20 may be provided within the battery case 30.

Here, the outer shape of the solid battery module 20 is slightly larger than that of the liquid battery module 10, and the distance from the side surface of the liquid battery module 10 to the inner surface of the battery case is larger than the distance from the side surface of the solid battery module 20 to the inner surface of the battery case. Therefore, as shown in fig. 1C, the liquid battery module 10 is arranged so as to be shielded by the solid battery module 20 when viewed from the direction perpendicular to the main surface. The distance from the side surface of the liquid battery module 10 to the inner surface of the battery case 30 and the distance from the side surface of the solid battery module 20 to the inner surface of the battery case 30 are, for example, 5mm or more, respectively.

According to the above technical configuration, the solid-state battery module 20, which has a low possibility of fire and is larger than the liquid-state battery module 10, is disposed between the liquid-state battery modules 10, which have a high possibility of fire, and therefore the solid-state battery module 20 functions as a firewall. Therefore, the battery module 100 with high reliability in which the burn-up of the liquid battery module 10 is suppressed can be realized. The solid-state battery module 20 may have a single-layer structure or a stacked structure.

(embodiment mode 2)

[ arrangement of liquid battery module and solid battery module according to embodiment 2 ]

Next, a battery module according to embodiment 2 will be described. Fig. 2A is a schematic cross-sectional view of the battery module according to embodiment 2 cut along a plane parallel to the Z-X plane. Fig. 2B is a schematic cross-sectional view of the battery module according to embodiment 2 taken on a plane parallel to the X-Y plane. Fig. 2C is a schematic cross-sectional view of the battery module according to embodiment 2 taken on a plane parallel to the Y-Z plane. In embodiment 2 below, differences from embodiment 1 will be mainly described, and redundant description will not be given.

As shown in fig. 2A to 2C, the battery module 101 according to embodiment 2 includes a plurality of liquid battery modules 10, a plurality of solid battery modules 20, and a battery case 30 that houses the plurality of liquid battery modules 10 and the plurality of solid battery modules 20. The battery modules 101 may each include at least one liquid battery module 10 and one solid battery module 20. The number of the liquid battery modules 10 and the number of the solid battery modules 20 included in the battery module 101 are not particularly limited.

In the battery case 30, the plurality of liquid battery modules 10 and the plurality of solid battery modules 20 are alternately arranged so that main surfaces thereof are in contact with each other. That is, the solid-state battery module 20 is disposed in contact with the liquid-state battery module 10. For example, one liquid cell module 10 is sandwiched between two solid cell modules 20.

Here, the solid-state battery module 20 is one turn larger than the liquid-state battery module 10, and the side surfaces of the solid-state battery module 20 are in contact with the inner surface of the battery case 30. Further, the solid battery module 20 may be integrated with the battery case 30. The liquid battery module 10 is disposed in a closed space surrounded by the main surfaces of the two solid battery modules and the inner surface of the battery case 30. Here, the closed space means a substantially closed space, and is not necessarily a sealed space.

According to the above technical configuration, since the liquid battery module 10 having a high possibility of ignition is disposed in the closed space formed by the solid battery module 20 and the battery case 30, which have a low possibility of ignition, the possibility of burning of the other liquid battery modules 10 is very low when one liquid battery module 10 is ignited. That is, the battery module 101 with high reliability in which the burn-up of the liquid battery module 10 is suppressed can be realized. Further, at least a part of the plurality of liquid cell modules 10 may be arranged in series. That is, two or more liquid battery modules 10 may be sandwiched by two solid battery modules 20, or two or more liquid battery modules 10 may be arranged in series at the ends of a battery module row. In this case, the spread of fire between two or more liquid battery modules 10 and another liquid battery module 10 can be suppressed. At least a part of the plurality of solid-state battery modules 20 may be arranged in series. That is, two or more solid battery modules 20 may be sandwiched by two liquid battery modules 10, or two or more solid battery modules 20 may be arranged in series at the end of a battery module row. At least one of the liquid battery modules 10 may not be in contact with the solid battery module 20. A support member for supporting the plurality of liquid battery modules 10 and the plurality of solid battery modules 20 may be provided in the battery case 30. The solid-state battery module 20 may have a single-layer structure or a stacked structure.

(embodiment mode 3)

[ arrangement of liquid battery module and solid battery module according to embodiment 3 ]

Next, a battery module according to embodiment 3 will be described. Fig. 3A is a schematic cross-sectional view of the battery module according to embodiment 3 cut along a plane parallel to the Z-X plane. Fig. 3B is a schematic cross-sectional view of the battery module according to embodiment 3 taken on a plane parallel to the X-Y plane. Fig. 3C is a schematic cross-sectional view of the battery module according to embodiment 3 taken on a plane parallel to the Y-Z plane. In embodiment 3 below, differences from embodiments 1 and 2 will be mainly described, and redundant description will not be given.

As shown in fig. 3A to 3C, the battery module 102 according to embodiment 3 includes a plurality of liquid battery modules 10, a plurality of solid battery modules 22, and a battery case 30 that houses the plurality of liquid battery modules 10 and the plurality of solid battery modules 22. The battery module 102 may include at least one liquid battery module 10. The number of the liquid battery modules 10 included in the battery module 102 is not particularly limited.

The solid-state battery module 22 is formed with a space for housing the liquid battery modules 10 in a wrapped manner, and the plurality of liquid battery modules 10 are disposed in the space, respectively. The shape and size of the space are substantially equal to the outer shape of the liquid cell module 10. As a result, the solid-state battery module 22 is in contact with the main surface and the side surface of each of the plurality of liquid battery modules 10, and covers the main surface and the side surface of each of the plurality of liquid battery modules 10. That is, the entire surface of the liquid cell module 10 is covered with the solid cell module 22. Since the plurality of liquid battery modules 10 are covered with the solid battery module 22, the plurality of liquid battery modules 10 cannot be seen from the outside. Further, a part of the solid battery module 22 is sandwiched between one liquid battery module 10 and the other liquid battery module 10.

With the above technical configuration, the entire liquid battery module 10 having a high possibility of ignition is covered with the solid battery module 22 having a low possibility of ignition, and therefore, when one liquid battery module 10 ignites, the possibility of burning of the other liquid battery modules 10 is very low. That is, the battery module 102 with high reliability in which the burn-up of the liquid battery module 10 is suppressed can be realized. At least a part of the plurality of liquid cell modules 10 may be arranged in series. At least one of the liquid battery modules 10 may not be in contact with the solid battery module 20. A support member for supporting the plurality of liquid battery modules 10 and solid battery modules 20 may be provided within the battery case 30. The solid battery module 20 may be constituted by a plurality of single cell modules. The solid-state battery module 22 may have a single-layer structure or a stacked structure.

Modification of battery module according to embodiment 3

In the battery module 102, the main surface and the side surfaces of each of the plurality of liquid battery modules 10 are covered with one solid battery module 22, but the main surface and the side surfaces of each of the plurality of liquid battery modules 10 may be covered with a plurality of solid battery modules. Fig. 4 is a schematic cross-sectional view of the battery module according to modification 1 of embodiment 3 as described above, cut along a plane parallel to the Z-X plane.

As shown in fig. 4, a battery module 102a according to modification 1 of embodiment 3 includes a plurality of liquid battery modules 10, a plurality of solid battery modules 20, a plurality of solid battery modules 22a, and a battery case 30 that houses the plurality of liquid battery modules 10, the plurality of solid battery modules 20, and the plurality of solid battery modules 22 a.

In the battery module 102a, the solid-state battery module 22 is implemented by a plurality of solid-state battery modules 22a and the solid-state battery module 20. The solid-state battery module 22a is an example of each of the 1 st and 2 nd solid-state battery modules, and has, for example, the same electrolyte as the solid-state battery module 20. The solid battery module 22a may be a single cell module.

The solid-state battery modules 22a each have a recess for receiving the liquid battery module 10. The size and shape of the recess are substantially equal to the outer shape of the liquid cell module 10. The main surface of the liquid battery module 10 housed in the recess of one solid battery module 22a, which is not in contact with the one solid battery module 22a, is in contact with the bottom surface of the other solid battery module 22 a. The main surface of the liquid battery module 10 located at the one end on the X-axis positive side in the X-axis direction, which is not in contact with the solid battery module 22a, is in contact with the main surface of the rectangular solid battery module 20.

According to the above technical configuration, since the entire liquid battery module 10 having a high possibility of ignition is covered with at least one of the solid battery module 20 and the solid battery module 22a having a low possibility of ignition, the possibility of burning of the other liquid battery module 10 when one liquid battery module 10 is ignited is very low. That is, the battery module 102a with high reliability in which the burn-up of the liquid battery module 10 is suppressed can be realized. At least a part of the plurality of liquid cell modules 10 may be arranged in series. That is, two or more liquid battery modules 10 may be housed in the recess of one solid battery module 22 a. At least one of the liquid battery modules 10 may not be in contact with the solid battery module 22 a. A support member for supporting the plurality of liquid battery modules 10, the plurality of solid battery modules 22a, and the solid battery modules 20 may be provided in the battery case 30.

The solid-state battery module 22 may be realized by adding a solid-state battery module for covering the side surface of the liquid battery module 10 to the battery module 100. Fig. 5 is a schematic cross-sectional view of the battery module according to modification 2 of embodiment 3 as described above, cut along a plane parallel to the Z-X plane.

As shown in fig. 5, a battery module 102b according to modification 2 of embodiment 3 includes a plurality of liquid battery modules 10, a plurality of solid battery modules 20, a plurality of solid battery modules 22b, and a battery case 30 that houses the plurality of liquid battery modules 10, the plurality of solid battery modules 20, and the plurality of solid battery modules 22 b.

In the battery module 102b, the side surfaces of the plurality of liquid battery modules 10 are covered with the plurality of solid battery modules 22 b. Each of the plurality of solid-state battery modules 22b is an example of the 3 rd solid-state battery module, and has, for example, the same electrolyte as that of the solid-state battery module 20. The solid battery module 22b may be a single cell module.

The plurality of solid-state battery modules 22b are respectively disposed between the two solid-state battery modules 20 and on the side surface of one liquid-state battery module 10. The solid-state battery modules 22b are arranged in four numbers corresponding to the four directions so as to surround the liquid battery modules 10 from the four directions with respect to one liquid battery module 10, but one solid-state battery module 22b in a rectangular ring shape surrounding the four directions of the liquid battery module 10 may be arranged with respect to one liquid battery module 10.

With the above technical configuration, the entire liquid battery module 10 having a high possibility of ignition is covered with the solid battery module 20 and the solid battery module 22b having a low possibility of ignition, and therefore, when one liquid battery module 10 ignites, the possibility of burning of the other liquid battery modules 10 is very low. That is, the battery module 102b with high reliability in which the burn-up of the liquid battery module 10 is suppressed can be realized. At least a part of the plurality of liquid cell modules 10 may be arranged in series. That is, one solid-state battery module 22b may cover the side surfaces of two or more liquid battery modules 10. At least one of the liquid battery modules 10 may not be in contact with the solid battery module 22 b. A support member for supporting the plurality of liquid battery modules 10, the plurality of solid battery modules 22b, and the plurality of solid battery modules 20 may be provided in the battery case 30.

(embodiment mode 4)

Fig. 6 is an explanatory diagram showing a schematic configuration of a vehicle according to embodiment 4. The vehicle 160 according to embodiment 4 is, for example, an electric automobile. The vehicle 160 includes a motor 161, a battery module 162, and wheels 163. The battery module 162 is any of the battery modules of the above-described embodiments and modifications. The battery module 162 supplies electric power to the motor 161 to drive the motor 161. The motor 161 rotates the wheel 163, thereby moving the vehicle 160. The vehicle 160 may be another vehicle such as a hybrid vehicle. Alternatively, the vehicle 160 may be a train, an airplane, a ship, or other vehicle.

According to the above technical configuration, since the motor 161 is driven by the electric power of the battery module 162 with high reliability in which the spread of fire from the liquid battery module 10 is suppressed, it is possible to safely move people and goods.

(other embodiments)

The embodiments have been described above, but the present disclosure is not limited to such embodiments. Further, the present disclosure includes a configuration obtained by applying various modifications that can be conceived by a person skilled in the art to the above-described embodiment, and a configuration in which the constituent elements and functions described in the above-described embodiments 1 to 4 are arbitrarily combined without departing from the gist of the present disclosure.

For example, the present disclosure may be implemented in the form of a battery pack. The battery pack includes, for example, two or more liquid battery modules or solid battery modules, peripheral devices such as sensors or controllers (in other words, control circuits), and a battery case for housing the peripheral devices. The term "battery module" in the above-described embodiments may be appropriately replaced with "battery pack".

Industrial applicability

The present disclosure can be used as a highly reliable battery module.