CN221900079U - Battery housing assembly and battery - Google Patents

Abstract

The utility model relates to a battery shell assembly and a battery, including a shell and a top cover, the top of the shell is open and provided with a receiving cavity for arranging a battery cell, the top cover covers the opening of the shell, a heat dissipation module is arranged in the shell, and the area ratio of the heat dissipation cross section of the heat dissipation module along a first direction to the end face of the battery cell parallel to the heat dissipation module along the first direction is 0.1 to 0.7. The battery includes a plurality of battery cells and the above-mentioned battery shell assembly. The utility model arranges a heat dissipation module in the shell, and the heat dissipation module is placed between the shell and the top cover. The coolant enters the heat exchange channel from the coolant inlet to exchange heat with the electrolyte and then flows out from the coolant outlet, taking away the internal heat of the battery, which is beneficial to the heat dissipation of the battery.

Description

Battery housing assembly and battery

Technical Field

The utility model belongs to the technical field of batteries, and in particular relates to a battery shell component and a battery.

Background Art

Against the backdrop of global energy conservation, emission reduction and sustainable development, the replacement of fossil energy with new energy has become a popular demand. Currently, new energy technologies have been widely used in the fields of automobiles, heavy trucks, agricultural drones, power tools, etc.

Power batteries have the characteristics of high energy density, long cycle life, no memory effect and environmental friendliness, and are widely used in plug-in hybrid electric vehicles, hybrid electric vehicles and pure electric vehicles. However, as the power and size of batteries increase, a large amount of heat is generated during the charging and discharging process, causing the battery temperature to be too high, resulting in poor charging and discharging process, battery damage, and even serious safety accidents.

In summary, there is an urgent need to provide a battery casing assembly and a battery that is beneficial to battery heat dissipation, can reduce battery weight, increase battery pack energy density, and reduce costs.

Utility Model Content

The utility model aims to provide a battery shell assembly and a battery which are beneficial to the heat dissipation of the battery, can reduce the weight of the battery, improve the energy density of the battery pack, and reduce the cost at the same time.

The above object is achieved through the following technical solution: a battery shell assembly, including a shell and a top cover, the top of the shell is open and has a accommodating cavity for arranging a battery cell, the top cover covers the opening of the shell, a heat dissipation module is arranged in the shell, and the heat dissipation cross-section of the heat dissipation module along the first direction and the area ratio of the end face of the heat dissipation module parallel to the battery cell along the first direction is 0.1 to 0.7.

The utility model arranges a heat dissipation module in the shell. When used, the heat dissipation module is placed between the shell and the top cover. The coolant enters the heat exchange channel from the coolant inlet to exchange heat with the electrolyte and then flows out from the coolant outlet to take away the internal heat of the battery. Those skilled in the art should understand that the heat dissipation cross-section is the maximum cross-section parallel to the end face of the heat dissipation module, and the end face of the battery cell parallel to the heat dissipation module is the large face of the battery cell. It has been verified by experiments that when the ratio of the two is less than 0.1, the heat conduction area is relatively small and the heat dissipation effect is poor. When the ratio of the two is greater than 0.7, the electrolyte of the battery does not flow smoothly between the heat dissipation modules, affecting the performance of the battery.

A further technical solution is that the heat dissipation module is fixedly connected to the shell and/or the top cover, and the heat dissipation module divides the accommodating cavity into a plurality of accommodating chambers for installing the battery cells, and the heat dissipation module is provided with a liquid hole. The provision of the liquid hole facilitates the circulation of the electrolyte inside the shell, improves the battery energy density, and reduces the cost. In specific applications, the top cover is provided with a liquid injection hole, an explosion-proof plate, a pole, a mounting hole, etc. The heat dissipation module is fixedly installed and fixed to the top cover through the mounting hole, and the heat dissipation module is close to the lower plastic at the bottom of the top cover.

A further technical solution is that the heat dissipation module is provided with a heat exchange channel, and the heat exchange channel includes a main channel and a branch channel, and the ratio of the cross-sectional area of the main channel to the sum of the cross-sectional areas of the branch channels is 0.2 to 2. Those skilled in the art should understand that the main channel is the main part with a large flow rate between the coolant inlet and the coolant outlet, and the branch channel branching out from the main channel is generally smaller in diameter and flow rate than the main channel. The cross-sectional area of the main channel or the branch channel is the area of the cross section obtained by cutting the main channel or the branch channel from the middle or a certain part perpendicular to the main channel or the branch channel. The calculation of the specific cross-sectional area varies depending on the shape of the flow channel of the main channel or the branch channel. If the main channel or the branch channel is a circular tube, the cross section obtained is a circle, the inner diameter of the main channel or the branch channel is R, and the cross-sectional area of the main channel or the branch channel is πR ² ; It has been verified that when the ratio of the cross-sectional area of the main channel to the sum of the cross-sectional areas of the branch channels is less than 0.2, the coolant flow rate of each branch channel relative to the main channel is slower, and the heat dissipation effect is poor. When the ratio of the main channel to the sum of the cross-sectional areas of each branch channel is greater than 2, the coolant flow rate of each branch channel relative to the main channel is slower, the resistance to the flow of the coolant is larger, and there is a large pressure difference between the coolant inlet and the coolant outlet, which increases the requirements for sealing quality and consumes more energy. In specific applications, the cross-sectional shape of the heat exchange channel of the heat dissipation module can be circular, polygonal, or runway-shaped, with rectangular and circular shapes being preferred. The flow rate of each part can be controlled by changing the cross-sectional area of the channel. In places where heat generation is high, the cross-sectional area per unit area is increased to increase its flow rate and heat dissipation area, take away more heat, and achieve the purpose of overall balanced heat dissipation.

A further technical solution is that the ratio of the wall thickness of one side of the shell parallel to the heat dissipation module along the first direction to the thickness of the heat dissipation module is 0.2 to 1. The side of the shell parallel to the heat dissipation module is the large side of the shell. When the ratio of the wall thickness of one side of the shell parallel to the heat dissipation module to the thickness of the heat dissipation module is less than 0.2, the heat dissipation module is thicker, the heat dissipation is poor, the heat dissipation module is heavy, and the energy density of the battery is reduced; when the ratio is greater than 1, the heat dissipation module is thinner, the fluid channel is narrow, and it is not easy to process. The amount of fluid passing through per unit time is small, which is not conducive to heat dissipation. In the specific application process, the heat dissipation module is assembled with the shell. According to the shape and position of the battery cell, the heat dissipation module is perpendicular to the bottom surface of the top cover and perpendicular to or parallel to the large side of the shell.

A further technical solution is that the battery housing assembly is provided with injection holes, and the ratio of the number of injection holes to the battery volume is 1600 mm ³ /piece to 5000 mm ³ /piece. Those skilled in the art should understand that the battery volume is the volume of the housing. When the ratio of the number of injection holes to the battery volume is too large, the injection speed is slow and the efficiency is low. When the ratio is too small, the sealing cost of the injection holes will increase and the time required for sealing the injection holes will increase. In specific applications, the injection holes are preferably evenly distributed on the top cover.

A further technical solution is that the inner wall of the shell is provided with a limiting part, and the heat dissipation module is limited by the limiting part; or the shell and the heat dissipation module are integrally cast. The limiting part is preferably a limiting groove or a limiting boss. The setting of the limiting part can limit and position the heat dissipation module, which is convenient for accurate assembly and connection.

A further technical solution is that a coolant inlet and a coolant outlet are respectively provided at both ends of the heat exchange channel, and the coolant inlet and the coolant outlet are arranged on the top of the heat dissipation module and extend to the top cover. In this way, the coolant inlet and the coolant outlet are outside the shell, which effectively ensures that the coolant is isolated from the electrolyte, and there will be no leakage or gas leakage due to the cooling device.

A further technical solution is that the liquid holes are arranged between the heat exchange channels in the middle of the heat dissipation module and at the edge of the heat dissipation module.

To achieve the above object, the present invention further provides a battery, comprising a plurality of battery cells and any of the battery housing assemblies described above, wherein the battery cells are arranged in the accommodation chamber. The ratio of the length to the thickness of the battery is greater than or equal to 3, and the ratio of the height to the thickness is greater than or equal to 2. At this time, the battery has a large-capacity battery cell structure, and the solution of the utility model technology can be adopted to cancel the heat dissipation structure at the pack end.

A further technical solution is that the length of the battery is greater than or equal to 300 mm, the height is greater than or equal to 200 mm, and the thickness is less than or equal to 100 mm.

A further technical solution is that the top cover is provided with an explosion-proof valve, and the ratio of the battery volume to the valve opening area of the explosion-proof valve is 2000mm to 14000mm. In specific applications, the valve opening area should be designed according to the battery volume. The valve opening area of the explosion-proof valve is the area of the tearing area when the explosion-proof valve explodes. Generally, the valve opening area of the explosion-proof valve is greater than or equal to ^189mm2 . When the above ratio is less than 2000mm, the valve opening area of the explosion-proof valve 175 is relatively small relative to the battery volume. When the above ratio is less than 2000mm, the valve opening area of the explosion-proof valve is relatively small relative to the battery volume, and the exhaust rate is not large enough, even less than the battery gas production rate, and the battery is prone to explosion when it is thermally runaway; when the above ratio is greater than 14000mm, the explosion-proof valve area is too large relative to the battery volume, which reduces the structural strength of the top cover and is not easy to process.

Compared with the prior art, the implementation of the technical solution of the utility model sets a heat dissipation module inside the battery, and the coolant flows through the heat dissipation module to take away the heat inside the battery, thereby reducing the battery temperature. For large-capacity battery cell structures, the heat dissipation structure at the pack end can be eliminated, thereby reducing the weight of the battery. At the same time, the top cover of the heat dissipation module is connected to the shell, which effectively ensures that the coolant is isolated from the electrolyte, and there will be no leakage or gas leakage due to the cooling device; the heat dissipation module is provided with a liquid hole, which helps the electrolyte flow in the shell, improves the battery energy density, and reduces the cost.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

FIG1 is a perspective view of a battery housing assembly according to an embodiment of the present invention;

FIG2 is a cross-sectional schematic diagram of a battery housing assembly involved in one embodiment of the utility model;

FIG3 is an enlarged schematic diagram of part A of the battery housing assembly involved in FIG2 ;

FIG4 is a schematic diagram of an exploded structure of a battery according to an embodiment of the present invention;

FIG5 is a cross-sectional schematic diagram of a battery according to an embodiment of the present invention;

FIG6 is a front view of an explosion-proof valve according to an embodiment of the present invention;

FIG7 is a schematic cross-sectional view of the explosion-proof valve involved in FIG6 along the A-A plane;

FIG8 is a cross-sectional schematic diagram of a battery according to another embodiment of the present invention;

FIG. 9 is an enlarged schematic diagram of a portion B of the battery shown in FIG. 8 .

In the figure:

1 heat dissipation module 2 pole 3 injection hole 4 top cover

5 Valve opening area 6 Coolant inlet 7 Housing 8 Coolant outlet

9 Main channel 10 Branch channel 11 Liquid hole 12 Lower plastic

13 heat dissipation cross section 14 battery cell 15 notch 16 battery cell large surface

17 explosion-proof valve 18 limit boss

DETAILED DESCRIPTION

The utility model is described in detail below in conjunction with the accompanying drawings. The description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the utility model. In addition, those skilled in the art can make corresponding combinations of the features in the embodiments and in different embodiments in this document based on the description of this document. In addition, the term "first direction" is the Y direction in Figure 2, the "second direction" is the Y direction in Figure 2, and the wall thickness direction of the heat dissipation module, the battery cell, and the shell parallel to the heat dissipation module is the Z direction in Figure 2, wherein the Z direction is perpendicular to the plane where the X-axis and the Y-axis in Figure 2 are located.

An embodiment of the utility model is as follows, referring to Figures 1 to 3, a battery shell assembly includes a shell 7 and a top cover 4, the shell 7 is open at the top and is provided with a accommodating cavity for arranging a battery cell 14, the top cover 4 covers the opening of the shell 7, a heat dissipation module 1 is provided in the shell 7, and a heat dissipation cross-section S of the heat dissipation module 1 along a first direction is 0.1 to 0.7 with respect to an area S0 of an end face of the battery cell parallel to the heat dissipation module 1 along the first direction, that is, 0.1≤S/S0≤0.7.

The utility model sets a heat dissipation module in the shell 7. When used, as shown in FIG5, the heat dissipation module is placed between the shell 7 and the top cover 4. The coolant enters the heat exchange channel from the coolant inlet 6 to exchange heat with the electrolyte and then flows out from the coolant outlet 8 to take away the heat inside the battery. Those skilled in the art should understand that the heat dissipation cross section 13 is the maximum cross section parallel to the end surface S of the heat dissipation module 1, and the end surface S0 of the battery cell 14 parallel to the heat dissipation module is the large surface 16 of the battery cell. The first direction mentioned above is the Y direction as shown in FIG2. It has been verified by experiments that when the ratio of the two is less than 0.1, the heat conduction area is relatively small and the heat dissipation effect is poor. When the ratio of the two is greater than 0.7, the electrolyte of the battery does not flow smoothly between the heat dissipation modules 1, affecting the performance of the battery.

On the basis of the above-mentioned embodiments, in another embodiment of the present invention, as shown in FIG1 and FIG2, the heat dissipation module is fixedly connected to the shell 7 and/or the top cover 4, the heat dissipation module 1 divides the accommodating cavity into a plurality of accommodating chambers for installing the battery cell 14, the heat dissipation module is provided with a heat exchange channel, and the two ends of the heat exchange channel are respectively provided with a coolant inlet 6 and a coolant outlet 8, and the heat dissipation module is provided with a liquid hole 11. The provision of the liquid hole 11 facilitates the circulation of the electrolyte inside the shell 7, improves the battery energy density, and reduces the cost. In specific applications, as shown in FIG1, the top cover 4 is provided with a liquid injection hole 3, an explosion-proof valve 17, a pole 2, a mounting hole, etc., the heat dissipation module is fixedly installed with the top cover 4 through the mounting hole, and the heat dissipation module is close to the lower plastic 12 at the bottom of the top cover 4.

Specifically, the number of heat sinks can be selected according to the size of the battery and the number of bare cells, that is, the number of bare cells is n, the number of heat dissipation modules is m, 1≤m≤n-1, and the number of heat sinks can be reduced to increase the battery energy density while satisfying the heat dissipation condition. The heat sinks are evenly distributed in the shell to dissipate heat evenly.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in FIG2 , the heat dissipation module 1 is provided with a heat exchange channel, and the heat exchange channel includes a main channel 9 and a branch channel 10, and the ratio of the cross-sectional area of the main channel 9 to the sum of the cross-sectional areas of the branch channels 10 is 0.2 to 2, the cross-sectional area of the main channel 9 is S1, and the sum of the cross-sectional areas of the branch channels 10 is S2, that is, 0.2≤S1/S2≤2; It should be understood by those skilled in the art that the main channel 9 is the main and large flow portion between the coolant inlet 6 and the coolant outlet 9, and the branch channels 10 branch from the main channel The outgoing channel is the branch channel 10, and the diameter and flow rate of the branch channel 10 are generally smaller than those of the main channel 9; the cross-sectional area of the main channel 9 or the branch channel 10 is the area of the cross section obtained by cutting the main channel 9 or the branch channel 10 from the middle or a certain part perpendicular to the main channel 9 or the branch channel 10. The calculation of the specific cross-sectional area varies depending on the shape of the flow channel of the main channel 9 or the branch channel 10. If the main channel 9 or the branch channel 10 is a circular tube, the cross section obtained is a circle, the inner diameter of the main channel 9 or the branch channel 10 is R, and the cross-sectional area of the main channel 9 or the branch channel 10 is πR ² ; It has been verified that, generally, when the cross-sectional area ratio of the main channel 9 to the branch channel 10 is less than 0.2, the coolant flow rate of each branch channel 10 relative to the main channel 9 is slow, and the heat dissipation effect is not good. When the cross-sectional area ratio of the main channel 9 to the branch channel 10 is greater than 2, the coolant flow rate of each branch channel 10 relative to the main channel 9 is slow, and the resistance to the flow of the coolant is large. There is a large pressure difference between the coolant inlet 6 and the coolant outlet 8, which increases the requirements for sealing quality and consumes a lot of energy. In specific applications, the cross-sectional shape of the heat exchange channel of the heat dissipation module 1 can be circular, polygonal, or runway-shaped, with rectangular and circular shapes being preferred. And the flow rate of each part can be controlled by changing the cross-sectional area of the channel. In places where heat generation is high, the cross-sectional area per unit area is increased, the flow rate and heat dissipation area are increased, and more heat is taken away to achieve the purpose of overall balanced heat dissipation.

On the basis of the above embodiment, in another embodiment of the present invention, the ratio of the wall thickness h1 of the shell 7 parallel to the heat dissipation module 1 along the first direction (Y direction in FIG. 2) to the thickness h2 of the heat dissipation module 1 is 0.2-1, that is, 0.2≤h1/h2≤1. The side of the shell 7 parallel to the heat dissipation module 1 is the large side of the shell 7. When the ratio of the wall thickness h2 of the side of the shell 7 parallel to the heat dissipation module 1 to the thickness h1 of the heat dissipation module 1 is less than 0.2, the heat dissipation module 1 is thicker, the heat dissipation is poor, the heat dissipation module 1 is heavy, and the energy density of the battery is reduced; when the ratio is greater than 1, the heat dissipation module 1 is thinner, the fluid channel is narrow, and it is not easy to process. The amount of fluid passing through per unit time is small, which is not conducive to heat dissipation. In the specific application process, the heat dissipation module 1 is assembled with the shell 7. According to the shape and position of the battery cell 14, the heat dissipation module 1 is perpendicular to the bottom surface of the top cover 4 and perpendicular or parallel to the large surface of the shell 7.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in FIG1 and FIG2, the top cover 4 of the battery housing assembly is provided with injection holes 3, and the ratio of the number of the injection holes 3 to the battery volume is 1600 mm ³ /piece to 5000 mm ³ /piece. Those skilled in the art should understand that the battery volume is the volume of the housing 7, and when the ratio of the number of injection holes 3 to the battery volume is too large, the injection speed is slow and the efficiency is low. When the ratio is too small, the sealing cost of the injection holes 3 will increase, and the time required for sealing the injection holes 3 will increase.

On the basis of the above-mentioned embodiments, in another embodiment of the present invention, as shown in FIG. 4, FIG. 8 and FIG. 9, the inner wall of the shell 7 is provided with a limiting portion, and the heat dissipation module is limited by the limiting portion; or the shell 7 and the heat dissipation module are integrally cast. The limiting portion is preferably a limiting groove or a limiting boss 18. The setting of the limiting portion can limit and position the heat dissipation module, which is convenient for precise assembly and connection. In the specific application process, as shown in FIG. 8, the limiting boss 18 is set on the inner wall of the shell 7, and can be stamped from the outside to the inside. The protruding height of the limiting boss 18 is preferably 0.5-5mm. If the height of the limiting boss 18 is too large, it will interfere with the battery cell and the processing is difficult. If the height of the limiting boss 18 is too low, the limiting effect is not good. The limiting boss 18 can limit the normal movement of the heat dissipation module 1, which is convenient for precise assembly and connection. Of course, in another embodiment, the shell and the heat dissipation module can be integrally cast.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in FIG2 and FIG3, the two ends of the heat exchange channel are respectively provided with a coolant inlet 6 and a coolant outlet 8, and the coolant inlet 6 and the coolant outlet 8 are arranged on the top of the heat dissipation module 1 and extend to the top cover 4. In this way, the coolant inlet 6 and the coolant outlet 8 are outside the shell 7, which effectively ensures that the coolant is isolated from the electrolyte, and there will be no leakage or gas leakage due to the cooling device.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in FIG. 2 , the liquid passage holes 11 are arranged between the heat exchange channels in the middle of the heat dissipation module 1 and at the edge of the heat dissipation module 1 .

The present invention also provides a battery, the embodiments of which are as follows, as shown in Figures 4 and 5, including a plurality of battery cells 14 and any of the battery shell 7 components described above, wherein the battery cells 14 are arranged in the accommodation chamber, and an electrolyte is provided in the accommodation chamber. The ratio of the length L to the thickness A of the battery is greater than or equal to 3, that is, L/A≥3, and the ratio of the height H to the thickness A is greater than or equal to 2, that is, H/A≥2. At this time, the battery has a large-capacity battery cell structure. When used, the number of bare batteries in the battery is not less than 3, the circumference of the shell notch is greater than 1200mm, and the large-surface wall thickness of the shell h1≥0.7mm; the heat dissipation structure at the pack end can be eliminated by adopting the solution of the technology of the utility model.

On the basis of the above embodiment, in another embodiment of the present invention, the length L of the battery is greater than or equal to 300 mm, the height H is greater than or equal to 200 mm, and the thickness A is less than or equal to 100 mm.

On the basis of the above embodiment, in another embodiment of the present invention, as shown in FIG6 and FIG7, the top cover 4 is provided with an explosion-proof valve 17, and the ratio of the battery volume (V) to the valve opening area 5 of the explosion-proof valve 17 is 2000mm to 14000mm. In specific applications, the valve opening area 5 should be designed according to the battery volume. The valve opening area 5 of the explosion-proof valve 17 is the area of the tearing area when the explosion-proof valve 17 explodes, that is, the area of the inner plane of the notch 15 in FIG6. Generally, the valve opening area 5 (S4) of the explosion-proof valve 17 is greater than or equal to ^189mm2 . When the above ratio is less than 2000mm, the valve opening area 5 of the explosion-proof valve 17 is small relative to the battery volume, the exhaust rate is not large enough, and is even less than the battery gas production rate, and the battery is prone to explosion when it is thermally runaway; when the above ratio is greater than 14000mm, the area of the explosion-proof valve 17 is too large relative to the battery volume, which reduces the structural strength of the top cover 4 and is not easy to process.

The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (10)

1. A battery shell assembly, comprising a shell and a top cover, wherein the top of the shell is open and provided with a receiving cavity for arranging a battery cell, and the top cover covers the opening of the shell, characterized in that a heat dissipation module is provided in the shell, a coolant flows through the heat dissipation module, and an area ratio of a heat dissipation cross section of the heat dissipation module along a first direction to an end face of the battery cell parallel to the heat dissipation module along the first direction is 0.1 to 0.7. 2. The battery shell assembly according to claim 1 is characterized in that the heat dissipation module is fixedly connected to the shell and/or the top cover, the heat dissipation module divides the accommodating cavity into a plurality of accommodating chambers for installing battery cells, and the heat dissipation module is provided with a liquid hole. 3. The battery housing assembly according to claim 2 is characterized in that the heat dissipation module is provided with a heat exchange channel, the heat exchange channel includes a main channel and a branch channel, and the ratio of the cross-sectional area of the main channel to the sum of the cross-sectional areas of each branch channel is 0.2 to 2. 4 . The battery housing assembly according to claim 2 , wherein a ratio of a wall thickness of a side of the housing parallel to the heat dissipation module along the first direction to a thickness of the heat dissipation module is 0.2 to 1. 5 . The battery housing assembly according to claim 1 , wherein the battery housing assembly is provided with injection holes, and the ratio of the number of the injection holes to the battery volume is 1600 mm ³ /hole to 5000 mm ³ /hole. 6. The battery housing assembly according to claim 1, characterized in that a limiting portion is provided on the inner wall of the housing, and the heat dissipation module is limited by the limiting portion; or the housing and the heat dissipation module are integrally cast. 7. The battery housing assembly according to claim 3 is characterized in that the heat exchange channel is provided with a coolant inlet and a coolant outlet, and the coolant inlet and the coolant outlet are arranged on the top of the heat dissipation module and extend to the top cover. 8. The battery housing assembly according to claim 7 is characterized in that the top cover is provided with an explosion-proof valve, and the ratio of the battery volume to the valve opening area of the explosion-proof valve is 2000mm~14000mm; or the liquid hole is arranged between the heat exchange channels in the middle of the heat dissipation module and/or at the edge of the heat dissipation module. 9. A battery, characterized in that it comprises a plurality of battery cells and a battery housing assembly according to any one of claims 1 to 8, wherein the battery cells are arranged in the accommodating chamber, the ratio of the length to the thickness of the battery is greater than or equal to 3, and the ratio of the height to the thickness of the battery is greater than or equal to 2. 10 . The battery according to claim 9 , wherein the length of the battery is greater than or equal to 300 mm, the height is greater than or equal to 200 mm, and the thickness is less than or equal to 100 mm.