Battery, battery module and battery pack

Abstract

The utility model provides a battery, a battery module and a battery pack in order to solve the problems that most of pole columns designed by an existing battery cell are located on the outer side of a shell or the outer side of a cover plate, the space utilization rate of the battery cell is reduced when a battery cell pack is assembled, a liquid injection hole and the pole columns are located on the same face, and the pole columns are prone to being polluted by electrolyte. The battery comprises a shell, at least one pole assembly and a liquid injection hole, the liquid injection hole and a concave part are arranged on the surface of the shell, the liquid injection hole and the concave part are not coplanar, and the pole assembly is arranged in the concave part. According to the battery provided by the invention, the concave part and the liquid injection hole are formed in the surface of the shell, and the pole assembly is arranged in the concave part, so that the overall height of the battery is not increased, and the space utilization rate of the battery is improved; and the sunken part and the liquid injection hole are not coplanar, so that the problem that the electrolyte pollutes the pole column in the battery manufacturing process can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery, a battery module and a battery pack. Background Art

[0002] The design of the core structure is the key to the core design. It is necessary to ensure the safety of the core, ensure the energy density of the core, and consider the convenience of core packing. Core packing refers to the process of combining multiple cores in series or parallel to form a complete battery pack or battery pack.

[0003] Most of the pole columns in traditional core designs are located outside the outer shell or the cover plate. The pole columns protruding from the outer shell or the cover plate occupy a large space. When assembling the core pack, the core pole columns further occupy more core space, reducing the utilization rate of the core space, and the improvement of the energy density of the core is also limited to a certain extent. Most of the pole columns of the core are on the same surface as the liquid injection hole or the explosion-proof valve. During the core manufacturing process, it is easy to pollute the pole columns with electrolyte. At the same time, it is difficult to avoid the secondary impact caused by the opening of the explosion-proof valve hitting the battery pole column in extreme cases. Summary of the Utility Model

[0004] Aiming at the problems that most of the pole columns in the existing core designs are located outside the outer shell or the cover plate, the utilization rate of the core space is reduced during the assembly of the core pack, the liquid injection hole and the pole column are on the same surface, and it is easy to pollute the pole column with electrolyte, the present application provides a battery, a battery module and a battery pack.

[0005] The utility model provides a battery, including an outer shell, at least one pole column assembly and a liquid injection hole. The outer shell surface is provided with the liquid injection hole and at least one concave part. The liquid injection hole and the concave part are not coplanar, and the pole column assembly is arranged in the concave part.

[0006] Preferably, the outer shell includes a shell body and a cover plate. The shell body is a semi-closed structure with an opening on one side. The cover plate covers the opening and is hermetically connected to the shell body.

[0007] The concave part is arranged on the surface of the shell body; or, the concave part is arranged on the surface of the cover plate.

[0008] Preferably, the shell body includes a first surface, two second surfaces and two third surfaces. The two second surfaces are arranged opposite to each other, and the two third surfaces are arranged opposite to each other. The two second surfaces and the two third surfaces are arranged around to form the side surface of the shell body. The first surface is arranged opposite to the cover plate.

[0009] The concave part is arranged on the first surface, and the areas of the second surface and the third surface are both smaller than the area of the first surface.

[0010] Preferably, the recessed portion includes a bottom wall and a side wall. One long side of the side wall coincides with one long side of the bottom wall. The side of the bottom wall away from the side wall is connected to the first surface. The pole column assembly is disposed on the side wall. In the extending direction of the pole column assembly towards the first surface, the height by which the pole column assembly protrudes from the side wall is less than or equal to the height by which the bottom wall extends towards the first surface.

[0011] Preferably, a connecting portion is provided on the outer periphery of the opening. The cover plate is connected to the housing through the connecting portion.

[0012] Preferably, the battery further includes an explosion-proof valve, and the explosion-proof valve is not coplanar with the recessed portion.

[0013] Preferably, the recessed portion is provided at one end of the outer casing, and at least two of the pole column assemblies are provided in the recessed portion.

[0014] Or, the recessed portions are provided at both opposite ends of the outer casing, and at least one of the pole column assemblies is provided in each recessed portion.

[0015] Preferably, the pole column assembly includes a pole column, a bus bar, a first insulating member, an insulating seal, and a second insulating member. A first through hole is provided in the pole column, and a second through hole is provided in the recessed portion. The bus bar includes a horizontal portion and a vertical portion. The horizontal portion is electrically connected to the pole column. One end of the vertical portion is connected to the horizontal portion, and the vertical portion sequentially passes through the first through hole and the second through hole. The first insulating member is disposed between the pole column and the outer casing. The insulating seal is disposed between the vertical portion and the outer casing. The second insulating member is disposed between the horizontal portion and the outer casing.

[0016] In a second aspect, the present application provides a battery module, including the battery described above.

[0017] In a third aspect, the present application provides a battery pack, including the battery module described above.

[0018] Compared with the prior art, for the battery provided by the present application, a recessed portion is provided on the surface of the outer casing, and a pole column assembly is provided in the recessed portion, without increasing the overall height of the battery, improving the space utilization rate of the battery. At the same time, when the battery is assembled into a module, the bus bar and the wires can be arranged in the remaining area of the recessed portion, greatly improving the space utilization rate of the battery module assembly. The BMS can also be placed in the recessed portion to improve the overall space utilization rate of the battery. The liquid injection hole is provided on the outer surface of the outer casing, and the liquid injection hole is not coplanar with the recessed portion, which can avoid the problem of electrolyte contaminating the pole column during the battery manufacturing process. Description of the Drawings

[0019] Figure 1 It is an explosion schematic diagram of a battery provided by an embodiment of the present utility model, with a recess provided on the cover plate;

[0020] Figure 2 It is a schematic structural diagram of a battery - shell and pole - column assembly provided by an embodiment of the present utility model;

[0021] Figure 3 It is a schematic cross - sectional structure diagram of a battery provided by an embodiment of the present utility model;

[0022] Figure 4 is Figure 3 an enlarged view of A in

[0023] Figure 5 It is an explosion schematic diagram of a battery provided by another embodiment of the present utility model;

[0024] Figure 6 It is an explosion schematic diagram of a battery provided by an embodiment of the present utility model, with a recess provided on the shell;

[0025] Figure 7 It is an explosion schematic diagram of a battery provided by an embodiment of the present utility model, in which there is only a positive - pole column assembly in the recess.

[0026] 1. Shell; 101. Shell body; 102. Cover plate; 103. Recess; 1031. Bottom wall; 1032. Side wall; 104. Opening; 2. Pole - column assembly; 201. Pole column; 202. Bus bar; 2021. Horizontal part; 2022. Vertical part; 203. First insulating part; 204. Insulating seal; 205. Second insulating part; 3. Liquid - injection hole; 4. Explosion - proof valve; 5. Electrode core. Detailed implementation manners

[0027] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0028] In order to illustrate the technical solution of the present utility model, it will be described below through specific embodiments.

[0029] As Figures 1 - 4 shown in FIGS. 4, 6, and 7, an embodiment of the present application provides a battery, including a shell 1, at least one pole - column assembly 2, and a liquid - injection hole 3. The surface of the shell 1 is provided with the liquid - injection hole 3 and at least one recess 103. The liquid - injection hole 3 and the recess 103 are not coplanar, and the pole - column assembly 2 is arranged in the recess 103.

[0030] Specifically, when the outer shell 1 has a square structure, the surface of the outer shell 1 can refer to any surface of the outer shell 1. For example, it can be a side surface composed of length and width, or a side surface composed of length and height, or a bottom surface or top surface composed of width and height. At least one recess 103 is provided on the surface of the outer shell 1, and a pole assembly 2 is provided in the recess 103. Since the pole assembly 2 is provided in the recess 103, compared with the existing setting method where the pole 201 protrudes from the outer shell 1, the pole assembly 2 provided in the recess 103 does not increase the overall height of the battery, improving the space utilization rate of the battery. At the same time, when the battery is assembled into a module, the bus bar 202 and the wires can be arranged in the remaining area of the recess 103, greatly improving the space utilization rate of the battery module assembly.

[0031] When the battery is a small steel shell battery, at least one recess 103 is provided on the surface of the outer shell 1, and a pole assembly 2 is provided in the recess 103. The BMS can be placed in the recess 103, improving the overall space utilization rate of the battery.

[0032] The traditional liquid injection hole 3 is limited by the size of the width of the cover plate 102, and the position of the liquid injection hole 3 is relatively close to the pole 201, making it easy to have the problem of electrolyte contaminating the pole 201.

[0033] For the battery provided in this application, at least one recess 103 is provided on the surface of the outer shell 1, a pole assembly 2 is provided in the recess 103, and the liquid injection hole 3 is provided on the surface of the outer shell 1. The non-coplanarity of the liquid injection hole 3 and the recess 103 can avoid the problem of electrolyte contaminating the pole 201 during the battery manufacturing process. This structure can select the specific position of the liquid injection hole 3 on the cover plate 102 according to the planar width, equipment selection, and electrolyte injection situation.

[0034] Compared with the prior art, for the battery provided in this application, a recess 103 is provided on the surface of the outer shell 1, and a pole assembly 2 is provided in the recess 103, which does not increase the overall height of the battery and improves the space utilization rate of the battery. At the same time, when the battery is assembled into a module, the bus bar 202 and the wires can be arranged in the remaining area of the recess 103, greatly improving the space utilization rate of the battery module assembly. The BMS can also be placed in the recess 103 to improve the overall space utilization rate of the battery. The liquid injection hole 3 is provided on the surface of the outer shell 1, and the non-coplanarity of the liquid injection hole 3 and the recess 103 can avoid the problem of electrolyte contaminating the pole 201 during the battery manufacturing process.

[0035] In an embodiment, the outer shell 1 includes a housing 101 and a cover plate 102. The housing 101 is a semi-closed structure with an opening 104 provided on one side, and the cover plate 102 covers the opening 104 and is hermetically connected to the housing 101.

[0036] The recess 103 is provided on the surface of the housing 101; or, the recess 103 is provided on the surface of the cover plate 102.

[0037] It can be understood that an opening 104 is provided on one side of the housing 101, and its structure includes at least the following cases: one is that the opening 104 is provided at the bottom of the housing 101; the other is that the opening 104 is provided at the top of the housing 101 (as Figure 7 shown); the third is that the opening 104 is provided on the side surface of the housing 101, and one of the side surfaces can be selected to provide the opening 104 (as Figure 1 shown).

[0038] Specifically, the outer shell 1 is a semi-closed structure with an opening 104 provided on one side. The electrode core 5 enters the shell through this opening 104, and the cover plate 102 covers the opening 104 and is hermetically connected to the housing 101 to prevent battery leakage. For the hermetic connection method, laser welding can be used, for example.

[0039] It should be noted that the recess 103 can be provided on the surface of the housing 101, and the opening 104 is hermetically connected to the cover plate 102, as Figure 1 shown; as Figure 6 shown, the recess 103 is provided on the surface of the cover plate 102. It can be selected according to actual needs whether the recess 103 is provided on the surface of the housing 101 or the surface of the cover plate 102.

[0040] It can be understood that the arrangement positions of the opening 104, the recess 103, the positive electrode terminal assembly, and the negative electrode terminal assembly include at least the following cases: one is that the opening 104 is provided at the top of the housing 101, the recess 103 is provided on the surface of the housing 101, the positive electrode terminal assembly is provided in the recess 103, and the housing 101 and the cover plate 102 are used as the negative extreme to be connected to the outside. The second is that the opening 104 is provided at the top of the housing 101, the recess 103 is provided on the surface of the housing 101, and the positive electrode terminal assembly and the negative electrode terminal assembly are provided in the recess 103. The third is that the opening 104 is provided on the side surface of the housing 101, the recess 103 is provided on the surface of the housing 101, and the positive electrode terminal assembly and the negative electrode terminal assembly are provided in the recess 103 (as Figure 1 shown). The fourth is that the opening 104 is provided on the side surface of the housing 101, the recess 103 is provided on the surface of the housing 101, the positive electrode terminal assembly is provided in the recess 103, and the housing 101 and the cover plate 102 are used as the negative extreme to be connected to the outside. The fifth is that the opening 104 is provided on the side surface of the housing 101, the recess 103 is provided on the surface of the cover plate 102, the positive electrode terminal assembly is provided in the recess 103, and the housing 101 and the cover plate 102 are used as the negative extreme to be connected to the outside (as Figure 7As shown). Sixth, an opening 104 is provided on the side surface of the housing 101, the recessed portion 103 is provided on the surface of the cover plate 102, and a positive pole column assembly and a negative pole column assembly are provided in the recessed portion 103 (as Figure 6 shown). In one embodiment, the housing 101 includes a first surface, two second surfaces, and two third surfaces. The two second surfaces are disposed opposite to each other, the two third surfaces are disposed opposite to each other, and the two second surfaces and the two third surfaces surround to form the side surface of the housing 101. The first surface is disposed opposite to the cover plate 102;

[0041] The recessed portion 103 is provided on the first surface, and the areas of the second surface and the third surface are both smaller than the area of the first surface.

[0042] Specifically, the area of the first surface is larger than the area of the second surface, and the area of the first surface is larger than the area of the third surface.

[0043] Specifically, the housing 101 has a structure with an opening 104 on one side. The two second surfaces and the two third surfaces are arranged in a surrounding manner to form the side surface of the housing 101. The first surface is disposed opposite to the opening 104, and at the same time, the first surface is also disposed opposite to the cover plate 102.

[0044] When the recessed portion 103 is provided on the surface of the housing 101, the recessed portion 103 can be provided on the first surface, the second surface, the third surface, or the cover plate 102. Preferably, the recessed portion 103 is provided on the first surface or the cover plate 102. The areas of the first surface and the cover plate 102 are relatively large, which can enable the cover plate 102 assembly used to have a longer length and a wider width.

[0045] In one embodiment, the recessed portion 103 includes a bottom wall 1031 and a side wall 1032. One long side of the side wall 1032 coincides with one long side of the bottom wall 1031. The side of the bottom wall 1031 away from the side wall 1032 is connected to the first surface; the pole column assembly 2 is provided on the side wall 1032. The extending direction of the pole column assembly 2 towards the first surface, the height of the pole column assembly 2 protruding from the side wall 1032 is less than or equal to the height of the bottom wall 1031 extending towards the first surface away from the side wall 1032.

[0046] Specifically, as Figure 1As shown, the recess 103 includes a bottom wall 1031 and a side wall 1032. The length of the bottom wall 1031 extending away from the side wall 1032 is defined as the width of the bottom wall 1031. It is defined that the height by which the pole assembly 2 protrudes from the side wall 1032 is less than or equal to the width of the bottom wall 1031. The pole assembly 2 does not protrude from the battery, does not increase the overall height of the battery, and improves the space utilization rate of the battery. At the same time, when the battery is assembled into a module, the bus bar 202 and the wire can be arranged in the remaining area of the recess 103, greatly improving the space utilization rate of the battery module assembly. The BMS can also be placed in the recess 103 to improve the overall space utilization rate of the battery.

[0047] Specifically, one long side of the side wall 1032 coincides with one long side of the bottom wall 1031, that is, the side of the side wall 1032 coincides with the side of the bottom wall 1031. The side of the bottom wall 1031 away from the side wall 1032 is connected to the first surface, as Figure 1 shown. The recess 103 is provided on the side of the housing 1 and is the large-area side. In this structure, one long side of the bottom wall 1031 away from the side wall 1032 coincides with the short side of the first surface. The recess 103 is provided on the large-area side of the housing 1 because the battery includes a positive tab and a negative tab, and the area occupied by the pole assembly 2 is relatively large. Therefore, when the positive tab and the negative tab of the electrode core ⑤ are on the same side, the area occupied by the pole assembly 2 is large, so the recess 103 is provided on the large-area side of the housing 1.

[0048] The pole assembly 2 is provided on the side wall 1032, and the bottom wall 1031 is not provided with the pole assembly 2 because the battery is generally relatively thin. If the pole assembly 2 is provided on the bottom wall 1031, it is easy for the pole assembly 2 to protrude from the battery, increasing the height of the battery.

[0049] In one embodiment, a connecting portion is provided on the outer periphery of the opening 104, and the cover plate 102 is connected to the housing 101 through the connecting portion.

[0050] Specifically, connecting portions are provided around the opening 104, which has the effect of increasing the strength of the housing 1 and also facilitating the welding of the housing 101 and the cover plate 102.

[0051] In one embodiment, the battery further includes an explosion-proof valve 4, and the explosion-proof valve 4 is not coplanar with the recess 103.

[0052] Specifically, since the explosion-proof valve 4 is not coplanar with the recess 103, the explosion-proof valve 4 is not coplanar with the pole assembly 2, which can avoid the secondary impact on the cell pole 201 caused by the opening of the explosion-proof valve 4 in extreme cases.

[0053] In one embodiment, the explosion-proof valve 4 is coplanar with the liquid injection hole 3.

[0054] Specifically, the explosion-proof valve 4 and the liquid injection hole 3 are arranged on the same plane, which is convenient for subsequent battery assembly.

[0055] In a preferred embodiment, both the explosion-proof valve 4 and the liquid injection hole 3 are arranged on the surface of the cover plate 102.

[0056] Specifically, the liquid injection hole 3 and the explosion-proof valve 4 are arranged on the cover plate 102. The cover plate 102 has a relatively high strength, which is convenient for forming the liquid injection hole 3, facilitating assembly and enhancing the safety of the battery.

[0057] In a preferred embodiment, both the explosion-proof valve 4 and the liquid injection hole 3 are arranged on the surface of the housing 101.

[0058] Specifically, the explosion-proof valve 4 and the liquid injection hole 3 can be selectively arranged on the surface of the housing 101, and different positions can be selected according to actual needs.

[0059] In a preferred embodiment, the explosion-proof valve 4 and the liquid injection hole 3 are not on the same plane.

[0060] In one embodiment, the recessed portion 103 is arranged at one end of the outer shell 1, and at least two of the pole assemblies 2 are arranged in the recessed portion 103;

[0061] Specifically, as Figure 1 shown, the battery includes a positive electrode tab and a negative electrode tab. When the positive electrode tab and the negative electrode tab of the battery are at the top end of the outer shell 1, the recessed portion 103 is arranged on the top surface of the outer shell 1. At the same time, two pole assemblies 2 are arranged in the recessed portion 103. One pole assembly 2 is connected to the positive electrode tab, and one pole assembly 2 is connected to the negative electrode tab. Similarly, when the positive electrode tab and the negative electrode tab of the battery are at the bottom of the outer shell 1, the recessed portion 103 is arranged on the bottom surface of the outer shell 1.

[0062] In one embodiment, the pole assembly 2 includes a pole 201, a bus bar 202, a first insulating member 203, an insulating seal 204 and a second insulating member 205. A first through hole is arranged in the pole 201, and a second through hole is arranged in the recessed portion 103. The bus bar 202 includes a horizontal portion 2021 and a vertical portion 2022. The horizontal portion 2021 is electrically connected to the pole 201. One end of the vertical portion 2022 is connected to the horizontal portion 2021, and the vertical portion 2022 sequentially passes through the first through hole and the second through hole. The first insulating member 203 is arranged between the pole 201 and the outer shell 1. The insulating seal 204 is arranged between the vertical portion 2022 and the outer shell 1. The second insulating member 205 is arranged between the horizontal portion 2021 and the outer shell 1.

[0063] Specifically, the battery includes a jelly roll 5 which includes a positive tab and a negative tab. The corresponding terminal assembly 2 includes a positive terminal assembly 2 and a negative terminal assembly 2. The terminal assembly 2 includes a terminal 201 and a bus bar 202. A first through hole is provided in the terminal 201, and a second through hole is provided in the housing 1. The first through hole and the second through hole facilitate the vertical portion 2022 of the bus bar 202 to pass through. The horizontal portion 2021 of the bus bar 202 is disposed on the side of the housing 1 facing the jelly roll 5. The bus bar 202 is used for welding with the tab. A second insulating member 205 is disposed between the horizontal portion 2021 and the housing 1 to play an insulating role and prevent the housing 1 and the bus bar 202 from contacting and causing a short circuit of the battery. The first insulating member 203 also plays an insulating role to prevent the housing 1 from contacting the terminal 201 and causing a short circuit of the battery. The insulating seal 204 plays a role in preventing the vertical portion 2022 of the bus bar 202 from contacting the housing 1 and causing a short circuit of the battery, and also plays a sealing role to prevent the battery from leaking liquid.

[0064] In one embodiment, the battery includes a jelly roll 5 which is disposed inside the housing 1.

[0065] The jelly roll 5 in the battery can be one, two, or more than two.

[0066] Another embodiment is provided in the present application. In another embodiment, the recessed portions 103 are respectively disposed at both ends of the housing 1, and the rest has the same structure as that in one embodiment.

[0067] In another embodiment, recessed portions 103 are provided at both opposite ends of the housing 1, and at least one terminal assembly 2 is disposed in each recessed portion 103.

[0068] Specifically, as Figure 5 shown, the battery includes a positive tab and a negative tab. When the positive tab of the battery is disposed at the top end of the housing 1 and the negative tab is at the bottom of the housing 1, the corresponding recessed portions 103 are respectively disposed on the top surface and the bottom surface of the housing 1. At the same time, one terminal assembly 2 is disposed in each recessed portion 103. The terminal assembly 2 on the top surface of the housing 1 is connected to the positive tab, and the terminal assembly 2 on the bottom surface of the housing 1 is connected to the negative tab.

[0069] Recessed portions 103 are provided at both opposite ends of the housing 1. Two terminal assemblies 2 can also be disposed in each recessed portion 103. That is, one end of the battery is the negative terminal end, and two negative tabs are led out. The other end of the battery is the positive tab end, and two positive tabs are led out. Two negative terminal assemblies are disposed in the recessed portion 103 at the negative terminal end, and two positive terminal assemblies are disposed in the recessed portion 103 at the positive terminal end. It can be understood that the number of disposed terminal assemblies is the same as the number of led-out tabs, and the corresponding terminal assemblies can be set according to the number of led-out tabs. The present application does not make a limitation.

[0070] In a second aspect, the present application provides a battery module including the battery described above.

[0071] For the battery module provided by the present application, by using the battery provided by the present application, when assembling the battery module, the bus bar 202 and the wire can be arranged in the remaining area of the recess 103, greatly improving the space utilization rate of the battery module assembly; when the battery is a small steel shell battery, the BMS can be placed in the recess 103 to improve the overall space utilization rate of the battery.

[0072] In a third aspect, the present application provides a battery pack including the battery module described above.

[0073] For the battery pack provided by the present application, the pole column assembly 2 in the battery does not increase the overall height of the battery, improving the space utilization rate of the battery; improving the energy density of the battery pack, the pole column assembly 2 and the liquid injection hole 3 are not on the same surface, avoiding the situation of electrolyte pollution in the battery manufacturing process, and the pole column assembly 2 and the explosion-proof valve 4 are not on the same surface, avoiding the secondary influence of the opening of the explosion-proof valve 4 in extreme cases on the battery pole 201.

[0074] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A battery, characterized in that, It includes a housing, at least one pole assembly and a liquid injection hole. The surface of the housing is provided with the liquid injection hole and at least one recess, and the liquid injection hole and the recess are not coplanar; the pole assembly is arranged in the recess.

2. The battery according to claim 1, wherein, The housing includes a shell body and a cover plate. The shell body is a semi-closed structure with an opening on one side, and the cover plate covers the opening and is hermetically connected to the shell body; The recess is arranged on the surface of the shell body; or, the recess is arranged on the surface of the cover plate.

3. The battery according to claim 2, characterized in that, The shell body includes a first surface, two second surfaces and two third surfaces. The two second surfaces are arranged opposite to each other, and the two third surfaces are arranged opposite to each other. The two second surfaces and the two third surfaces enclose the side surface of the shell body, and the first surface is arranged opposite to the cover plate; The recess is arranged on the first surface, and the areas of the second surface and the third surface are both smaller than the area of the first surface.

4. The battery according to claim 3, characterized in that, The recess includes a bottom wall and a side wall. One long side of the side wall coincides with one long side of the bottom wall, and one side of the bottom wall away from the side wall is connected to the first surface; the pole assembly is arranged on the side wall, and in the extending direction of the pole assembly towards the first surface, the height by which the pole assembly protrudes from the side wall is less than or equal to the height by which the bottom wall extends towards the first surface.

5. The battery according to claim 2, wherein, A connecting portion is arranged around the outer periphery of the opening, and the cover plate is connected to the shell body through the connecting portion.

6. The battery according to claim 1, characterized in that, The battery further includes an explosion-proof valve, and the explosion-proof valve is not coplanar with the recess.

7. The battery according to claim 1, characterized in that, The recess is arranged at one end of the housing, and at least two pole assemblies are arranged in the recess; Or, recesses are arranged at both opposite ends of the housing, and at least one pole assembly is arranged in each recess.

8. The battery according to claim 1, characterized in that, The pole assembly includes a pole, a bus bar, a first insulating member, an insulating seal and a second insulating member. A first through hole is arranged in the pole, and a second through hole is arranged in the recess. The bus bar includes a horizontal portion and a vertical portion. The horizontal portion is electrically connected to the pole, one end of the vertical portion is connected to the horizontal portion, and the vertical portion sequentially passes through the first through hole and the second through hole; the first insulating member is arranged between the pole and the housing, the insulating seal is arranged between the vertical portion and the housing, and the second insulating member is arranged between the horizontal portion and the housing.

9. A battery module, characterized in that, It includes the battery according to any one of claims 1-8.

10. A battery pack, characterized in that, It includes the battery module according to claim 9.

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