Battery cell

Abstract

The utility model discloses a battery monomer, which comprises a shell, a plurality of battery cells, a plurality of battery cells and a plurality of battery cells, the first pole group and the second pole group are arranged in the shell and are arranged at an interval along the width direction of the first pole group; the pole column is arranged in the mounting hole in a penetrating manner, and a groove which is recessed towards the direction far away from the interior of the shell is formed in the end surface, close to the interior of the shell, of the pole column; the connecting piece is located in the shell, the two ends of the connecting piece are connected with the first pole group and the second pole group respectively, the side, facing the thickness direction of the connecting piece, of the middle of the connecting piece protrudes to form a protruding part, and the protruding part is connected with the groove bottom wall of the groove. According to the battery monomer disclosed by the utility model, the compact structure can be ensured, the space utilization rate is improved, and the production cost can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field more particularly, relate to a battery monomer. BACKGROUND

[0002] In the related art, the pole post of the battery monomer is heavy, the production cost is high, and the connecting piece connected with the pole ear occupies a large space. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the prior art is solved. To this end, one purpose of the utility model is to provide a battery monomer, which can ensure compact structure, improve space utilization, and reduce production cost.

[0004] The battery monomer according to the utility model embodiment comprises: a shell, the shell is provided with a mounting hole; a first pole group and a second pole group, the first pole group and the second pole group are arranged in the shell and are arranged at intervals along the width direction of the first pole group; a pole post, the pole post is arranged in the mounting hole, and a groove recessed towards the direction away from the shell interior is arranged on the end face of the pole post close to the shell interior; a connecting piece, the connecting piece is located in the shell, the two ends of the connecting piece are connected with the first pole group and the second pole group respectively, the middle part of the connecting piece protrudes towards one side of the thickness direction of the connecting piece to form a protruding part, and the protruding part is connected with the groove bottom wall of the groove.

[0005] The battery monomer according to the utility model embodiment, by the pole post arranged in the mounting hole of the shell, the groove recessed towards the direction away from the shell interior is arranged on the end face of the pole post close to the shell interior, the two ends of the connecting piece are connected with the first pole group and the second pole group respectively, and the protruding part of the connecting piece is connected with the groove bottom wall of the groove, the connection requirement of the pole post, the first pole group and the second pole group is realized, the weight of the pole post is reduced, the production cost can be reduced, and the risk that the pole group connected with the connecting piece is torn during the bending of the connecting piece in the related art is avoided, the yield can be improved, the compact structure is ensured, and the space utilization can be improved.

[0006] In addition, the battery monomer according to the above embodiment of the utility model can also have the following additional technical features:

[0007] According to the battery monomer of some embodiments of the utility model, along the length direction of the first pole group, the two ends of the connecting piece are all recessed in the groove.

[0008] According to some embodiments of the utility model, the middle axis of the connecting piece extending along the width direction of the first pole group passes through the center point of the pole post.

[0009] According to some embodiments of the present application, the first pole group and the second pole group each comprises: a pole group body; a pole lug, the pole lug is located on the side of the pole group body close to the pole column and is connected with the pole group body, a containing groove is defined between the pole lug and the pole group body, and the connecting piece extends into the containing groove and is connected with the pole lug.

[0010] According to some embodiments of the present application, the opening direction of the containing groove of the first pole group and the containing groove of the second pole group are opposite.

[0011] According to some embodiments of the present application, the shell comprises: a shell body, one side of the shell body is open to form an opening; a cover plate, the cover plate is arranged on the opening, and the mounting hole is arranged on the cover plate.

[0012] According to some embodiments of the present application, one end of the pole column away from the first pole group is provided with a protruding part extending along the circumferential direction of the pole column, and upper plastic is arranged between the protruding part and the cover plate.

[0013] According to some embodiments of the present application, the battery monomer further comprises: a welding block, the welding block is located in the shell and is sleeved on one end of the pole column close to the first pole group, and one end of the pole column close to the first pole group is bent towards the side close to the welding block to be connected with the welding block.

[0014] According to some embodiments of the present application, the battery monomer further comprises: a sealing piece, the sealing piece is sleeved on the pole column and located on the side of the welding block away from the first pole group, and at least part of the radial inner side of the sealing piece abuts against the pole column and the radial outer side abuts against the hole wall of the mounting hole.

[0015] According to some embodiments of the present application, the pole column is two poles arranged at intervals along the length direction of the first pole group, and the connecting piece is two connecting pieces corresponding to the pole column.

[0016] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0018] Figure 1 is a structural schematic view of a battery monomer according to embodiments of the present application;

[0019] Figure 2 is a top view of a battery monomer according to embodiments of the present application;

[0020] Figure 3 is Figure 2 a sectional view along the direction indicated by line A-A;

[0021] Figure 4 is Figure 2 a sectional view along the direction indicated by line B-B;

[0022] Figure 5 is Figure 4 an enlarged structural schematic view of C shown in the middle circle;

[0023] Figure 6 is a structural schematic view of the first pole group and the second pole group cooperating with the cover plate according to an embodiment of the present application;

[0024] Figure 7 is a structural schematic view of the first pole group and the second pole group cooperating with the connecting piece according to an embodiment of the present application;

[0025] Figure 8 is a top view of the first pole group and the second pole group cooperating with the cover plate according to an embodiment of the present application;

[0026] Figure 9 is Figure 8 a sectional view along the direction indicated by line D-D;

[0027] Figure 10 is Figure 8 a sectional view along the direction indicated by line E-E;

[0028] Figure 11 is a structural schematic view of the cover plate cooperating with the pole according to an embodiment of the present application;

[0029] Figure 12 is a bottom view of the cover plate cooperating with the pole according to an embodiment of the present application;

[0030] Figure 13 is a top view of the cover plate cooperating with the pole according to an embodiment of the present application;

[0031] Figure 14 is Figure 13 a sectional view along the direction indicated by line F-F;

[0032] Figure 15 is a structural schematic view of the connecting piece of the battery monomer according to an embodiment of the present application;

[0033] Figure 16 is a top view of the connecting piece of the battery monomer according to an embodiment of the present application;

[0034] Figure 17 is Figure 16A sectional view along the direction indicated by line G-G.

[0035] Reference numerals:

[0036] 100, battery cell;

[0037] 10, housing; 11, mounting hole; 12, opening; 101, housing body; 102, cover plate;

[0038] 21, first pole group; 22, second pole group; 211, pole group body; 212, pole tab; 213, accommodating groove;

[0039] 30, pole post; 31, recess; 32, protrusion;

[0040] 40, connecting piece; 41, protrusion;

[0041] 50, welding block;

[0042] 61, upper plastic; 62, sealing member; 621, first sealing portion; 622, second sealing portion. DETAILED DESCRIPTION

[0043] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0044] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0045] In the description of the utility model, "first feature", "second feature" can include one or more features, "multiple" means two or more, the first feature "above" or "below" the second feature can include the first and second features directly contact, or can include the first and second features are not directly contact but contact through another feature between them, the first feature "above", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height.

[0046] The battery cell 100 according to the embodiment of the utility model is described below with reference to the drawings.

[0047] Referring to Figures 1-10 Fig. 1, the battery cell 100 according to the embodiment of the utility model can include a housing 10, a first pole group 21, a second pole group 22 and a pole 30. Among them, the battery cell 100 can be a square battery.

[0048] Specifically, the first pole group 21 and the second pole group 22 are arranged in the housing 10, and the first pole group 21 and the second pole group 22 are arranged in the width direction (for example Figure 4 The front and rear direction shown in Fig. 2) of the first pole group 21, and the first pole group 21 and the second pole group 22 can be protected by the housing 10, avoiding the first pole group 21 and the second pole group 22 exposed to damage, which is beneficial to prolong the service life of the first pole group 21 and the second pole group 22, and can improve the capacity of a single battery cell 100, facilitate the use of the housing 10, reduce production cost, and improve the volume utilization rate of the battery cell 100.

[0049] In addition, as shown in Figure 5 The housing 10 is provided with a mounting hole 11, and the pole 30 is arranged in the mounting hole 11 to realize the assembly requirement of the pole 30. The end surface (for example Figure 5 The lower end surface shown in Fig. 3) of the pole 30 close to the inside of the housing 10 is provided with a groove 31, and the groove 31 is recessed towards the direction away from the inside of the housing 10 (for example Figure 5 The upper end surface shown in Fig. 3) can reduce the weight of the pole 30, thereby reducing the weight of the battery cell 100, which is beneficial to reduce the production cost.

[0050] At the same time, as shown in Figure 4 , Figure 5 , Figure 7 , Figure 9 , Figure 10 , Figure 12 And Figure 14 The battery cell 100 further includes a connecting piece 40, the connecting piece 40 is located in the housing 10, and the two ends of the connecting piece 40 are connected with the first pole group 21 and the second pole group 22 respectively, for exampleFigure 4 Both ends in the front - rear direction (as shown in [reference]) are respectively connected to the first electrode group 21 and the second electrode group 22, which can meet the connection requirements of the first electrode group 21 and the second electrode group 22. The middle part of the connecting member 40 bulges towards one side in the thickness direction of the connecting member 40 (for example, Figure 5 the up - down direction as shown in [reference]), and a protruding part 41 can be formed. The protruding part 41 is connected to the bottom wall of the groove 31, which can realize the connection between the connecting member 40 and the pole post 30, and thus meet the connection requirements of the first electrode group 21 and the second electrode group 22 with the pole post 30. For example, both ends in the length direction of the connecting member 40 are respectively welded to the first electrode group 21 and the second electrode group 22, and the protruding part 41 is welded to the bottom wall of the groove 31.

[0051] Thus, the connecting member 40 can be formed into a "ji" - shaped structure as shown in Figures 15-17 [reference], avoiding the risk of tearing the electrode group connected to the connecting member easily caused by bending the connecting member during assembly in the related art, improving the yield rate, and the protruding part 41 can be located within the groove 31, which is beneficial to reducing the occupied space, ensuring a compact structure, and improving the space utilization rate.

[0052] It should be noted that for the convenience of description, in the present utility model, the orientations such as "front", "rear", "left", "right", "up" and "down" are based on the orientation relationship shown in the drawings, rather than the limitation of the orientation in the actual application process.

[0053] In some embodiments, the pole post 30 can be formed by stamping once, without secondary processing, with simple manufacturing, high connection strength, being beneficial to reducing the processing cost, and reducing the assembly process, and having high production efficiency.

[0054] According to the battery cell 100 of the embodiment of the present utility model, the pole post 30 passes through the mounting hole 11 of the housing 10. A groove 31 recessed in the direction away from the inside of the housing 10 is provided on the end face of the pole post 30 close to the inside of the housing 10. Both ends of the connecting member 40 are respectively connected to the first electrode group 21 and the second electrode group 22, and the protruding part 41 of the connecting member 40 is connected to the bottom wall of the groove 31, meeting the connection requirements of the pole post 30 with the first electrode group 21 and the second electrode group 22, being convenient for reducing the weight of the pole post 30, reducing the production cost, avoiding the risk of tearing the electrode group connected to the connecting member easily caused by bending the connecting member during assembly in the related art, improving the yield rate, and at the same time ensuring a compact structure and improving the space utilization rate.

[0055] In some embodiments of the present utility model, as shown in Figure 3 , Figure 12 and Figure 14 [reference], along the length direction of the first electrode group 21 (for example, Figure 3As shown in the left-right direction), both ends of the connector 40 are recessed into the groove 31, for example, in the width direction of the connector 40 (e.g., in the left-right direction). Figure 3 Both ends of the connector 40 (in the left and right directions shown) are recessed into the groove 31, which can reduce the width dimension of the connector 40, reduce the space occupied, and reduce the amount of material used in the connector 40, which is beneficial to reducing the production cost of the battery cell 100.

[0056] According to some embodiments of this utility model, such as Figure 3 , Figure 12 and Figure 14 As shown, the central axis of the connector 40 extending along the width direction of the first pole group 21 passes through the center point of the pole post 30, which can ensure that the connector 40 and the pole post 30 are reliably connected, facilitate assembly, and improve assembly efficiency.

[0057] In some embodiments of this utility model, such as Figure 12 As shown, along the length direction of the first electrode group 21, the distance between the groove sidewall of the groove 31 and the end face of the connector 40 on the same side is greater than or equal to 0.5 mm. That is, along the length direction of the first electrode group 21, the distance between the groove sidewall of the groove 31 and the end face of the connector 40 on the same side is H1 and satisfies H1≥0.5 mm. Within the above range, it is convenient for the protrusion 41 to extend into the groove 31, which facilitates the connection between the connector 40 and the pole post 30, making assembly convenient and improving assembly efficiency. For example, in some specific embodiments, along the length direction of the first electrode group 21, the distance between the groove sidewall of the groove 31 and the end face of the connector 40 on the same side can be 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, etc.

[0058] According to some embodiments of this utility model, such as Figure 7 As shown, both the first pole group 21 and the second pole group 22 include a pole group body 211 and a tab 212. The tab 212 is located on the side of the pole group body 211 closest to the pole post 30 (e.g., Figure 5 As shown on the upper side, the tab 212 is connected to the electrode assembly body 211, and a receiving groove 213 is defined between the tab 212 and the electrode assembly body 211. The connector 40 extends into the receiving groove 213 and is connected to the tab 212, enabling the connector 40 to connect to the first electrode assembly 21 or the second electrode assembly 22, ensuring a reliable connection. Furthermore, the tab 212 can be bent and directly connected to the connecting piece, making the connection convenient. This also shortens the length of the tab 212, ensuring a compact structure and reducing the space occupied by the battery cell 100. For example, the connector 40 and the tab 212 are connected by welding.

[0059] In some embodiments of this utility model, such as Figure 4As shown, along the width direction of the first pole group 21, the distance between the groove bottom wall of the accommodating groove 213 and the one end of the connecting piece 40 located at the same side is greater than or equal to 1 mm, that is, along the width direction of the first pole group 21, the distance between the groove bottom wall of the accommodating groove 213 and the one end of the connecting piece 40 located at the same side is H2 and satisfies H2≥1 mm. Within the above range, the connecting piece 40 length direction one end and the pole lug 212 have enough gap to avoid the burr, sharp corner and the like on the connecting piece 40 length direction one end to cause damage to the pole lug 212, and ensure the connection and assembly reliability. For example, in some embodiments, along the width direction of the first pole group 21, the distance between the groove bottom wall of the accommodating groove 213 and the one end of the connecting piece 40 located at the same side can be 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3 mm, etc.

[0060] According to some embodiments of the present application, as Figure 6 、 Figure 7 and Figure 10 shown, the openings 12 of the accommodating grooves 213 of the first pole group 21 and the second pole group 22 are opposite to each other, which facilitates the connection of the connecting piece 40 with the first pole group 21 and the second pole group 22, ensures reliable connection, makes the structure of the connecting piece 40 simple, and after the two ends of the connecting piece length direction are connected with the pole lug 212 of the first pole group 21 and the pole lug 212 of the second pole group 22 respectively, the first pole group 21 and the second pole group 22 can be turned over by a certain angle as Figures 6-10 shown, so that the first pole group 21 and the second pole group 22 can form a channel, which facilitates the connection of the connecting piece 40 with the pole 30, meets the required connection requirement, makes the connection convenient, and is beneficial to improve the assembly efficiency.

[0061] In some embodiments of the present application, as Figures 1-6 、 Figures 9-14 shown, the shell 10 includes a shell body 101 and a cover plate 102, one side of the shell body 101 is open to form an opening 12, and the cover plate 102 is covered on the opening 12. The shell body 101 and the cover plate 102 can protect the first pole group 21 and the second pole group 22, ensure reliable protection, and facilitate the assembly of the first pole group 21 and the second pole group 22, which is beneficial to improve the assembly efficiency. In addition, the mounting hole 11 is arranged on the cover plate 102, which facilitates the assembly of the pole 30, and makes the structure of the shell 10 simple, facilitates processing and manufacturing, and is beneficial to reduce the production cost. For example, the cover plate 102 can be an aluminum plate.

[0062] In some embodiments, as Figure 5As shown, the end of the pole post 30 away from the first pole group 21 is provided with a protrusion 32. The protrusion 32 extends along the circumferential direction of the pole post 30. The protrusion 32 can improve the structural strength of the pole post 30 and ensure that the pole post 30 is not prone to deformation or other problems when connected to the external structure.

[0063] In addition, such as Figure 5 As shown, an upper plastic 61 is provided between the protrusion 32 and the cover plate 102. The upper plastic 61 can insulate the protrusion 32 and the cover plate 102 to avoid short circuits or leakage and ensure the safety of the battery cell 100.

[0064] According to some embodiments of this utility model, such as Figures 3-5 , Figure 9 and Figure 14 As shown, the battery cell 100 also includes a welding block 50, which is located inside the housing 10 and is sleeved on the end of the terminal post 30 near the first electrode group 21 (e.g. Figure 5 As shown in the lower part, the end of the pole post 30 near the first electrode group 21 is bent towards the side near the welding block 50. This facilitates the connection between the end of the pole post 30 near the first electrode group 21 and the welding block 50, providing a support point and ensuring a reliable connection between the pole post 30 and the welding block 50. This ensures that the pole post 30 is reliably fixed on the cover plate 102, guarantees the connection between the pole post 30 and the connector 40, and simplifies the structure of the pole post 30, making it easier to process, manufacture, and assemble, thus reducing production costs. For example, the end of the pole post 30 near the first electrode group 21 is welded to the welding block 50.

[0065] In some embodiments of the housing 10, which includes a housing body 101 and a cover plate 102, such as Figure 5 As shown, the end of the terminal post 30 away from the first electrode group 21 has a protrusion 32. The protrusion 32 extends in the circumferential direction of the terminal post 30. The upper plastic 61 is located between the protrusion 32 and the cover plate 102, that is, the protrusion 32 abuts against the side of the cover plate 102 away from the first electrode group 21 through the upper plastic 61. Thus, by bending the end of the terminal post 30 near the first electrode group 21 toward the side near the welding block 50 to connect with the welding block 50, and by the protrusion 32 abutting against the side of the cover plate 102 away from the first electrode group 21 through the upper plastic 61, it is possible to ensure that the terminal post 30 is reliably fixed on the cover plate 102, preventing problems such as the terminal post 30 being prone to loosening, thereby ensuring the safety of the battery cell 100.

[0066] In some embodiments, such as Figure 5 As shown, the battery cell 100 also includes a seal 62, which is sleeved on the terminal post 30 and located on the side of the welding block 50 away from the first electrode group 21 (e.g., Figure 5As shown in the upper part, at least part of the radially inner side of the seal 62 abuts against the terminal post 30, thereby achieving a seal between the terminal post 30 and the welding block 50. At least part of the radially outer side of the seal 62 abuts against the wall of the mounting hole 11, thereby achieving a seal between the housing 10 and the welding block 50. This ensures a reliable seal at the mounting hole 11, prevents electrolyte or other chemicals inside the battery cell 100 from leaking to the outside, and ensures the safety of the battery cell 100.

[0067] In some embodiments of the housing 10, which includes a housing body 101 and a cover plate 102, such as Figure 5 As shown, the seal 62 includes a first sealing portion 621 and a second sealing portion 622. The first sealing portion 621 is formed in an annular shape, and one end of the second sealing portion 622 is connected to the end of the first sealing portion 621 that is away from the first pole group 21 (e.g., Figure 5 As shown in the figure, the upper end of the second sealing part 622 is connected, and the other end of the second sealing part 622 extends toward the side away from the first sealing part 621 and along the radial direction of the first sealing part 621. The second sealing part 622 is located between the cover plate 102 and the pole post 30, which can realize the sealing between the cover plate 102 and the pole post 30, ensure the sealing reliability at the mounting hole 11, ensure the safety of the battery cell 100, and the structure of the sealing part 62 is simple and easy to process and manufacture.

[0068] In some embodiments, during assembly, the pole post 30 passes through the upper plastic 61, the cover plate 102, the seal 62 and the welding block 50, and then the end of the pole post 30 near the first pole group 21 is bent toward the side near the welding block 50, and the end of the pole post 30 near the first pole group 21 is connected to the welding block 50 to achieve assembly and meet the required connection requirements.

[0069] In some embodiments of this utility model, such as Figures 1-3 , Figures 6-9 , Figures 11-14 As shown, there are two terminals 30, spaced apart along the length of the first electrode group 21. Two connectors 40 correspond one-to-one with each terminal 30, facilitating connection between the two connectors 40 and the two terminals 30 respectively. This fulfills the connection requirements between the first electrode group 21 and the second electrode group 22 and the two terminals 30, thus satisfying the structural requirements of the battery cell 100. For example, the two terminals 30 can be either a positive terminal 30 or a negative terminal 30.

[0070] Other configurations and operations of the battery cell 100 according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0071] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "link", "connection" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through the indirect connection of intermediate medium, can be two elements inside the communication.For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0072] In the description of the present specification, the description of the terms "embodiment", "specific embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are contained in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0073] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized by, The battery cell comprises: a shell provided with a mounting hole; a first pole group and a second pole group, which are arranged in the shell and are spaced apart along the width direction of the first pole group; a pole column, which is arranged in the mounting hole, and the end of the pole column close to the inside of the shell is provided with a groove recessed in the direction away from the inside of the shell; a connecting piece, which is located in the shell, and the two ends of the connecting piece are connected with the first pole group and the second pole group respectively, the middle part of the connecting piece protrudes to one side of the thickness direction of the connecting piece to form a protruding part, and the protruding part is connected with the groove bottom wall of the groove.

2. The battery cell of claim 1, wherein, Along the length direction of the first pole group, the two ends of the connecting piece are both recessed in the groove.

3. The battery cell of claim 2, wherein, The middle axis of the connecting piece extending along the width direction of the first pole group passes through the center point of the pole column.

4. The battery cell of claim 1, wherein, The first pole group and the second pole group both comprise: a pole group body; a pole lug, which is located on the side of the pole group body close to the pole column and is connected with the pole group body, and the pole lug and the pole group body define a receiving groove, the connecting piece extends into the receiving groove and is connected with the pole lug.

5. The battery cell of claim 4, wherein, The opening directions of the receiving grooves of the first pole group and the second pole group are opposite.

6. The battery cell of claim 1, wherein, The shell comprises: a shell body, one side of which is open to form an opening; a cover plate, which is arranged on the opening, and the mounting hole is arranged on the cover plate.

7. The battery cell of claim 6, wherein, The end of the pole column away from the first pole group is provided with a protruding part extending along the circumferential direction of the pole column, and the protruding part and the cover plate are provided with upper plastic.

8. The battery cell of claim 1, wherein, Further comprising: a welding block, which is located in the shell and is sleeved on the end of the pole column close to the first pole group, and the end of the pole column close to the first pole group is bent towards the side close to the welding block to be connected with the welding block.

9. The battery cell of claim 8, wherein, The battery cell further comprises: a sealing piece, which is sleeved on the pole column and is located on the side of the welding block away from the first pole group, and the at least part of the radial inner side of the sealing piece abuts against the pole column and the radial outer side abuts against the hole wall of the mounting hole.

10. The battery cell of any one of claims 1-9, wherein, The pole column is two arranged along the length direction of the first pole group, and the connecting piece is two corresponding to the pole column.

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