Housing assembly and battery cell having same

Abstract

The utility model discloses a shell assembly and a battery monomer with the shell assembly, the shell assembly is used for the battery monomer and comprises a shell body, an upper pole column assembly and a lower pole column assembly, the shell body defines an installation space, a pole group of the battery monomer is arranged in the installation space, the shell body is provided with a cover body, and the cover body is provided with an installation hole; the lower end of the upper pole assembly is arranged in the mounting hole; the upper end of the lower pole assembly is arranged in the mounting hole, the upper surface of the lower pole assembly is fixedly connected with the lower surface of the upper pole assembly in the mounting hole, and the lower pole assembly is electrically connected with the pole group. According to the shell assembly disclosed by the utility model, the mounting holes can limit the mounting of the upper pole assembly and the lower pole assembly, so that the upper pole assembly and the lower pole assembly can be conveniently assembled and connected in the mounting holes. And the cover body assembly can be assembled without using a riveting block, so that the space utilization rate of the battery monomers is relatively high.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of batteries, and particularly relates to a housing assembly and a battery cell having the same. Background Art

[0002] In the prior art, during battery assembly, generally, the pole post and the housing are riveted and connected. The existence of the riveting block seriously occupies the axial space of the battery cell, and the space utilization rate of the battery cell is relatively low. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a housing assembly, which can realize the assembly of the cover assembly without using a riveting block, and has a relatively high space utilization rate of the battery cell.

[0004] The utility model also provides a battery cell, which includes the above-mentioned housing assembly.

[0005] The housing assembly according to the embodiment of the utility model is used for a battery cell and includes a housing body, an upper pole post assembly and a lower pole post assembly. The housing body defines an installation space, the electrode group of the battery cell is arranged in the installation space, the housing body is provided with a cover body, and the cover body is provided with an installation hole; the lower end of the upper pole post assembly is arranged in the installation hole; the upper end of the lower pole post assembly is arranged in the installation hole, the upper surface of the lower pole post assembly is fixedly connected with the lower surface of the upper pole post assembly in the installation hole, and the lower pole post assembly is electrically connected with the electrode group.

[0006] For the housing assembly according to the embodiment of the utility model, by arranging the lower end of the upper pole post assembly and the upper end of the lower pole post assembly in the installation hole of the cover body, the upper surface of the lower pole post assembly is fixedly connected with the lower surface of the upper pole post assembly in the installation hole, and the lower pole post assembly is electrically connected with the electrode group. When assembling the housing assembly, the lower end of the upper pole post assembly can be first passed through the installation hole, and then the upper end of the lower pole post assembly can be passed through the installation hole. The installation hole can limit the installation of the upper pole post assembly and the lower pole post assembly, which is convenient for the assembly and connection of the upper pole post assembly and the lower pole post assembly in the installation hole. And the assembly of the cover assembly can be realized without using a riveting block, and the space utilization rate of the battery cell is relatively high.

[0007] In some embodiments of the present utility model, the upper pole column assembly includes an upper pole column, an upper plastic part, and an insulating seal. The lower surface of the upper pole column is electrically connected to the lower pole column assembly, and the upper pole column is used for electrical connection with an electrical device; the upper plastic part is disposed above the cover body, and at least part of the upper plastic part is disposed between the cover body and the upper end of the upper pole column; at least part of the insulating seal is disposed within the mounting hole, and the insulating seal wraps the upper pole column and the part of the lower pole column assembly disposed within the mounting hole.

[0008] In some embodiments of the present utility model, the lower pole column assembly includes a lower pole column and a lower plastic part. The upper surface of the lower pole column is electrically connected to the lower surface of the upper pole column, and the lower pole column is used for electrical connection with the pole group; at least part of the lower plastic part is disposed between the inner wall of the cover body and the lower end of the lower pole column.

[0009] In some embodiments of the present utility model, the upper surface of the lower pole column is laser welded to the lower surface of the upper pole column.

[0010] In some embodiments of the present utility model, the lower pole column includes a first pole column connection part, a pole group connection part, and a transition part. Along the thickness direction of the cover body, the first pole column connection part is disposed at one end of the lower pole column close to the upper pole column and is electrically connected to the upper pole column; along the thickness direction of the cover body, the pole group connection part is disposed at one end of the lower pole column close to the pole group and is electrically connected to the pole group; the transition part connects the first pole column connection part and the pole group connection part. Along the thickness direction of the cover body, the pole group connection part, the transition part, and the first pole column connection part are arranged and connected in sequence.

[0011] In some embodiments of the present utility model, the dimension L1 in the thickness direction of the first pole column connection part, the dimension L2 in the thickness direction of the transition part, and the dimension L3 in the thickness direction of the pole group connection part satisfy: L1≥L2≥L3; and / or, the dimension L3 in the thickness direction of the pole group connection part is 0.2 - 2 mm.

[0012] In some embodiments of the present utility model, the upper pole column includes a second pole column connection part. The second pole column connection part is disposed at one end of the upper pole column close to the lower pole column and is electrically connected to the lower pole column. In some embodiments of the present utility model,

[0013] In some embodiments of the present utility model, the dimension L1 in the thickness direction of the first pole column connection part and the dimension L4 in the thickness direction of the second pole column connection part satisfy: L1≥L4.

[0014] In some embodiments of the present utility model, the housing assembly further includes a connecting piece, which is disposed between the lower pole column assembly and the pole group and is used for electrically connecting the lower pole column assembly and the pole group.

[0015] The battery cell according to the embodiment of the present utility model includes the above-mentioned housing assembly.

[0016] For the battery cell according to the embodiment of the present utility model, by disposing the lower end of the upper pole column assembly and the upper end of the lower pole column assembly in the mounting holes of the cover body, the upper surface of the lower pole column assembly is fixedly connected to the lower surface of the upper pole column assembly in the mounting holes, and the lower pole column assembly is electrically connected to the pole group. When assembling the housing assembly, the lower end of the upper pole column assembly can be first passed through the mounting hole, and then the upper end of the lower pole column assembly can be passed through the mounting hole. The mounting holes can limit the installation of the upper pole column assembly and the lower pole column assembly, facilitating the assembly connection of the upper pole column assembly and the lower pole column assembly in the mounting holes. Moreover, the assembly of the cover body assembly can be achieved without using riveting blocks, and the space utilization rate of the battery cell is relatively high.

[0017] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0018] The above-mentioned and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0019] Figure 1 is a cross-sectional view of the battery cell according to the embodiment of the present utility model;

[0020] Figure 2 is Figure 1 an enlarged view of part A in

[0021] Figure 3 is a perspective view of the battery cell according to the embodiment of the present utility model;

[0022] Figure 4 is a top view of the battery cell according to the embodiment of the present utility model;

[0023] Figure 5 is a cross-sectional view of the upper pole column and the lower pole column of the housing assembly according to the embodiment of the present utility model;

[0024] Figure 6 is a perspective view of the upper pole column and the lower pole column of the housing assembly according to the embodiment of the present utility model;

[0025] Figure 7 is a cross-sectional view of the lower pole column of the housing assembly according to the embodiment of the present utility model;

[0026] Figure 8 It is a cross-sectional view of the upper pole column of the housing assembly according to an embodiment of the present utility model.

[0027] Reference numerals:

[0028] 100, battery cell;

[0029] 10, housing assembly;

[0030] 1, housing body; 11, installation space; 12, cover body; 121, installation hole;

[0031] 2, upper pole column assembly; 21, upper pole column; 211, second pole column connection part; 22, upper plastic part; 23, insulating seal;

[0032] 3, lower pole column assembly; 31, lower pole column; 311, first pole column connection part; 312, pole group connection part; 313, transition part; 32, lower plastic part;

[0033] 20, pole group. Specific embodiments

[0034] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0035] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0036] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] Reference will now be made to Figures 1 - 8 describe the housing assembly 10 according to an embodiment of the present utility model.

[0038] As Figure 1 and Figure 2 shown, the housing assembly 10 according to an embodiment of the present utility model includes a housing body 1, an upper terminal assembly 2, and a lower terminal assembly 3.

[0039] Specifically, as Figure 1 and Figure 3 shown, the housing assembly 10 is for a battery cell 100. The housing body 1 defines an installation space 11, and the electrode group 20 of the battery cell 100 is disposed in the installation space 11. The housing body 1 can protect the electrode group 20 from being damaged by external force impacts and also prevent the electrode group 20 from being invaded by external moisture, dust, etc.

[0040] As Figure 1 and Figure 2 shown, the housing body 1 is provided with a cover body 12, and the cover body 12 is provided with an installation hole 121. The lower end of the upper terminal assembly 2 is disposed in the installation hole 121, and the upper end of the lower terminal assembly 3 is disposed in the installation hole 121. When assembling the housing assembly 10, the lower end of the upper terminal assembly 2 can be first passed through the installation hole 121, and then the upper end of the lower terminal assembly 3 can be passed through the installation hole 121. The installation hole 121 can limit the installation of the upper terminal assembly 2 and the lower terminal assembly 3, facilitating the assembly connection of the upper terminal assembly 2 and the lower terminal assembly 3 in the installation hole 121.

[0041] As Figure 1 and Figure 2 shown, the upper surface of the lower terminal assembly 3 is fixedly connected to the lower surface of the upper terminal assembly 2 in the installation hole 121. The lower terminal assembly 3 is electrically connected to the electrode group 20, and the current in the electrode group 20 inside the housing assembly 10 of the battery cell 100 can be transmitted to the outside of the housing assembly 10, facilitating the charging and discharging of the battery cell 100.

[0042] According to the housing assembly 10 of the embodiment of the present utility model, by arranging the lower end of the upper pole column assembly 2 and the upper end of the lower pole column assembly 3 in the mounting hole 121 of the cover body 12, the upper surface of the lower pole column assembly 3 is fixedly connected to the lower surface of the upper pole column assembly 2 in the mounting hole 121, and the lower pole column assembly 3 is electrically connected to the pole group 20. When assembling the housing assembly 10, the lower end of the upper pole column assembly 2 can be first passed through the mounting hole 121, and then the upper end of the lower pole column assembly 3 can be passed through the mounting hole 121. The mounting hole 121 can limit the installation of the upper pole column assembly 2 and the lower pole column assembly 3, facilitating the assembly connection of the upper pole column assembly 2 and the lower pole column assembly 3 in the mounting hole 121. Moreover, the assembly of the cover body 12 assembly can be realized without using riveting blocks, and the space utilization rate of the battery cell 100 is relatively high.

[0043] In some embodiments of the present utility model, as Figure 1 and Figure 2 shown, the upper pole column assembly 2 includes an upper pole column 21, an upper plastic part 22 and an insulating seal 23. The lower surface of the upper pole column 21 is electrically connected to the lower pole column assembly 3. The upper pole column 21 is used for electrically connecting with an electrical device. The lower pole column assembly 3 is electrically connected to the pole group 20. The current in the pole group 20 inside the housing assembly 10 of the battery cell 100 can be transmitted to the external electrical device, facilitating the charging and discharging of the battery cell 100. The upper plastic part 22 is arranged above the cover body 12, and at least part of the upper plastic part 22 is arranged between the cover body 12 and the upper end of the upper pole column 21, which can prevent the part of the upper pole column 21 above the cover body 12 from contacting the cover body 12, prevent the upper pole column 21 from conducting electricity with the cover body 12, and prevent the battery cell 100 from short-circuiting.

[0044] As Figure 1 and Figure 2 shown, at least part of the insulating seal 23 is arranged in the mounting hole 121 and the insulating seal 23 wraps the part of the upper pole column 21 and the lower pole column assembly 3 arranged in the mounting hole 121. It can be understood that along the radial direction of the mounting hole 121 (such as the left-right direction shown in Figure 1 ), the insulating seal 23 can separate the upper pole column 21 and the lower pole column assembly 3 from the cover body 12, which can prevent the part of the upper pole column 21 and the lower pole column assembly 3 in the mounting hole 121 from contacting the cover body 12, prevent the upper pole column 21 or the lower pole column assembly 3 from conducting electricity with the cover body 12, and prevent the battery cell 100 from short-circuiting.

[0045] After combining the upper pole column 21, the upper plastic part 22 and the insulating seal 23 into the upper pole column assembly 2 and then assembling it with the cover body 12 and the lower pole column assembly 3, the assembly efficiency and performance are improved, and the yield rate of the production line is increased.

[0046] In some embodiments of the present utility model, as Figure 1 , Figure 2 ,Figure 4 and Figure 6 As shown in Figure 6 , the lower terminal post assembly 3 includes a lower terminal post 31 and a lower plastic part 32. The upper surface of the lower terminal post 31 is electrically connected to the lower surface of the upper terminal post 21. The lower terminal post 31 is used to be electrically connected to the electrode group 20, and can transfer the current in the electrode group 20 inside the housing assembly 10 of the battery cell 100 to the electrical equipment outside the housing assembly 10, facilitating the charging and discharging of the battery cell 100. At least part of the lower plastic part 32 is arranged between the inner wall of the cover body 12 and the lower end of the lower terminal post 31,

[0047] After combining the lower terminal post 31 and the lower plastic part 32 into the lower terminal post assembly 3 and then assembling it with the cover body 12 and the upper terminal post assembly 2, the assembly efficiency and performance are improved, and the yield rate of the production line is increased.

[0048] In some embodiments of the present invention, the upper surface of the lower terminal post 31 is connected to the lower surface of the upper terminal post 21 by laser welding. Laser welding can quickly concentrate energy to achieve high-speed welding, thereby improving production efficiency. And laser welding has extremely high positioning accuracy and repeated positioning accuracy, and can achieve precise welding of the upper terminal post 21 and the lower terminal post 31.

[0049] In some embodiments of the present invention, as Figure 5 and Figure 7 shown, the lower terminal post 31 includes a first terminal post connection part 311, an electrode group connection part 312 and a transition part 313. Along the thickness direction of the cover body 12 (such as the up and down direction shown in Figure 1 ), the first terminal post connection part 311 is arranged at one end of the lower terminal post 31 close to the upper terminal post 21 and is electrically connected to the upper terminal post 21. The first terminal post connection part 311 is relatively close to the upper terminal post 21, facilitating the electrical connection between the upper terminal post 21 and the first terminal post connection part 311, and can transfer the current in the electrode group 20 inside the housing assembly 10 of the battery cell 100 to the outside of the housing assembly 10, facilitating the charging and discharging of the battery cell 100.

[0050] Along the thickness direction of the cover body 12, the electrode group connection part 312 is arranged at one end of the lower terminal post 31 close to the electrode group 20 and is electrically connected to the electrode group 20. The electrode group connection part 312 is relatively close to the electrode group 20, facilitating the electrical connection between the electrode group 20 and the electrode group connection part 312, and can transfer the current in the electrode group 20 inside the housing assembly 10 of the battery cell 100 to the outside of the housing assembly 10, facilitating the charging and discharging of the battery cell 100.

[0051] ​​The transition portion 313 connects the first pole column connection portion 311 and the pole group connection portion 312. Along the thickness direction of the cover body 12, the pole group connection portion 312, the transition portion 313, and the first pole column connection portion 311 are arranged and connected in sequence. It can be understood that along the direction from the pole group 20 to the pole column, the pole group connection portion 312, the transition portion 313, and the first pole column connection portion 311 are arranged and connected in sequence, so that the position of the pole group connection portion 312 is relatively close to that of the pole group 20, the position of the first pole column connection portion 311 is relatively close to that of the upper pole column 21, and the transition portion 313 can transitionally connect the pole group connection portion 312 and the first pole column connection portion 311, facilitating the electrical connection between the upper pole column 21 and the first pole column connection portion 311, facilitating the electrical connection between the pole group 20 and the pole group connection portion 312, and enabling the current in the pole group 20 inside the housing assembly 10 of the battery cell 100 to be transmitted to the outside of the housing assembly 10, facilitating the charging and discharging of the battery cell 100.

[0052] In some embodiments of the present invention, as Figure 7 shown, the dimension L1 in the thickness direction of the first pole column connection portion 311 (such as the left - right direction shown in Figure 1 )), the dimension L2 in the thickness direction of the transition portion 313 (such as the left - right direction shown in Figure 1 ), and the dimension L3 in the thickness direction of the pole group connection portion 312 (such as the left - right direction shown in Figure 1 ) satisfy: L1≥L2≥L3. It can be understood that the thickness of the first pole column connection portion 311 is greater than or equal to the thickness of the transition portion 313 which is greater than or equal to the thickness of the pole group connection portion 312, so that along the radial direction of the lower pole column 31 from the center of the lower pole column 31, the thickness of each part of the lower pole column 31 decreases in sequence, facilitating the stamping processing and manufacturing of the lower pole column 31.

[0053] In some embodiments of the present invention, as Figure 7As shown, the dimension L3 in the thickness direction of the pole group connection part 312 is 0.2 - 2 mm. It can be understood that the dimension L3 in the thickness direction of the pole group connection part 312 can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2 mm. The dimension L3 in the thickness direction of the pole group connection part 312 is not less than 0.2 mm, which can ensure that the strength of the pole connection part and the dimension in the thickness direction is not less than that of the transition part 313 and the first pole connection part 311 of the pole connection part, and can ensure the reliability of the connection between the lower pole 31, the pole group 20 and the upper pole 21; the dimension L3 in the thickness direction of the pole group connection part 312 is not greater than 2 mm, which can avoid the larger dimension of the lower pole 31 in the thickness direction, avoid the larger space occupied by the lower pole 31 inside the battery cell 100, and make the layout inside the battery cell 100 more reasonable.

[0054] In some embodiments of the present invention, as Figure 5 and Figure 8 shown, the upper pole 21 includes a second pole connection part 211, and the second pole connection part 211 is arranged at one end of the upper pole 21 close to the lower pole 31 and is electrically connected to the lower pole 31. The second pole connection part 211 is relatively close to the lower pole 31, which is convenient for realizing the electrical connection between the lower pole 31 and the second pole connection part 211, and can transfer the current in the pole group 20 inside the housing assembly 10 of the battery cell 100 to the outside of the housing assembly 10, facilitating the charging and discharging of the battery cell 100.

[0055] Furthermore, as Figure 7 and Figure 8 shown, the dimension L1 in the thickness direction of the first pole connection part 311 and the dimension L4 in the thickness direction (such as the left - right direction shown in Figure 1 ) of the second pole connection part 211 satisfy: L1 ≥ L4. It can be understood that the dimension L1 in the thickness direction of the first pole connection part 311 is not less than the dimension L4 in the thickness direction of the second pole connection part 211, which is convenient for the laser to penetrate the second pole connection part 211 for welding when laser - welding the upper pole 21 and the lower pole 31, and increases the reliability of the welded connection between the first pole connection part 311 and the second pole connection part 211.

[0056] In some embodiments of the present invention, the housing assembly 10 further includes a connection piece, and the connection piece is arranged between the lower pole assembly 3 and the pole group 20 for electrically connecting the lower pole assembly 3 and the pole group 20.

[0057] The battery cell 100 according to an embodiment of the present utility model includes the above-mentioned housing assembly 10.

[0058] For the battery cell 100 according to an embodiment of the present utility model, by arranging the lower end of the upper pole column assembly 2 and the upper end of the lower pole column assembly 3 in the mounting hole 121 of the cover body 12, the upper surface of the lower pole column assembly 3 is fixedly connected to the lower surface of the upper pole column assembly 2 in the mounting hole 121, and the lower pole column assembly 3 is electrically connected to the electrode group 20. When assembling the housing assembly 10, the lower end of the upper pole column assembly 2 can be first passed through the mounting hole 121, and then the upper end of the lower pole column assembly 3 can be passed through the mounting hole 121. The mounting hole 121 can limit the installation of the upper pole column assembly 2 and the lower pole column assembly 3, facilitating the assembly connection of the upper pole column assembly 2 and the lower pole column assembly 3 in the mounting hole 121. Moreover, the assembly of the cover body 12 assembly can be realized without using a riveting block, and the space utilization rate of the battery cell 100 is relatively high.

[0059] The other constitutions and operations of the housing assembly 10 according to an embodiment of the present utility model and the battery cell 100 having the same are known to those of ordinary skill in the art and will not be described in detail here.

[0060] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0061] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A housing assembly, characterized in that: For battery cells and comprising: A shell body, wherein the shell body defines an installation space, the electrode group of the battery cell is arranged in the installation space, the shell body is provided with a cover body, and the cover body is provided with an installation hole; An upper pole assembly, the lower end of which is disposed in the mounting hole; A lower pole assembly, the upper end of which is disposed in the mounting hole, the upper surface of the lower pole assembly and the lower surface of the upper pole assembly are fixedly connected in the mounting hole, and the lower pole assembly is electrically connected to the pole group.

2. The housing assembly according to claim 1, characterized in that: The upper pole assembly comprises: An upper pole, the lower surface of which is electrically connected to the lower pole assembly, and the upper pole is used to be electrically connected to an electrical device; An upper plastic part, the upper plastic part is arranged above the cover body, and at least a part of the upper plastic part is arranged between the cover body and the upper end of the upper pole; An insulating seal, at least a portion of which is disposed in the mounting hole and the insulating seal wraps portions of the upper pole and the lower pole assembly disposed in the mounting hole.

3. The housing assembly according to claim 2, characterized in that: The lower pole assembly comprises: A lower pole, the upper surface of which is electrically connected to the lower surface of the upper pole, and the lower pole is used to be electrically connected to the pole group; A lower plastic part, at least a portion of which is disposed between the inner wall of the cover body and the lower end of the lower pole.

4. The housing assembly according to claim 3, characterized in that: The upper surface of the lower pole is connected to the lower surface of the upper pole by laser welding.

5. The housing assembly according to claim 3, characterized in that: The lower pole comprises: A first pole connecting portion, along the thickness direction of the cover, the first pole connecting portion is provided at one end of the lower pole close to the upper pole and is electrically connected to the upper pole; An electrode group connecting portion, along the thickness direction of the cover, the electrode group connecting portion is arranged at one end of the lower electrode column close to the electrode group and is electrically connected to the electrode group; And / or, a transition portion, the transition portion connecting the first pole connection portion and the pole group connection portion, along the thickness direction of the cover body, the pole group connection portion, the transition portion and the first pole connection portion are arranged and connected in sequence.

6. The housing assembly according to claim 5, characterized in that: The dimension L1 of the first pole connection portion in the thickness direction, the dimension L2 of the transition portion in the thickness direction and the dimension L3 of the pole group connection portion in the thickness direction satisfy: L1≥L2≥L3; And / or, the dimension L3 of the electrode group connection portion in the thickness direction is 0.2-2 mm.

7. The housing assembly according to claim 6, characterized in that: The upper pole comprises: The second pole connecting portion is disposed at one end of the upper pole close to the lower pole and is electrically connected to the lower pole.

8. The housing assembly according to claim 7, characterized in that: A dimension L1 of the first pole connecting portion in a thickness direction and a dimension L4 of the second pole connecting portion in a thickness direction satisfy: L1 ≥ L4.

9. The housing assembly according to claim 1, characterized in that: Also includes: A connecting piece is provided between the lower pole assembly and the pole group, and is used for electrically connecting the lower pole assembly and the pole group.

10. A battery cell, characterized in that: The invention comprises a housing assembly according to any one of claims 1 to 9.

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