Battery cell

Abstract

The invention discloses a battery cell. The battery cell comprises: a top cover assembly; the pole column is arranged on the top cover assembly in a penetrating manner; the first pole group and the second pole group are located on the same side in the thickness direction of the top cover assembly and are arranged at intervals in the width direction of the top cover assembly, and the pole lugs of the first pole group and the pole lugs of the second pole group are directly connected with the pole columns respectively. According to the battery monomer, the tabs of the first pole group and the tabs of the second pole group are directly connected with the pole columns respectively, so that the current of the first pole group and the current of the second pole group are directly led out through the pole columns, the flowing path of the current is shortened, the internal resistance of the battery monomer is further reduced, and the performance of the battery monomer is effectively improved. And meanwhile, the assembly process of the battery monomer is shortened, the assembly efficiency is improved, the cost is reduced, and the product competitiveness of the battery monomer is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery monomer. Background Art

[0002] In the related art, when the internal structure of a single battery cell includes multiple electrode groups, the internal resistance of the battery cell is relatively large, thereby affecting the performance of the battery cell. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a battery cell, which shortens the flow path of current, thereby reducing the internal resistance of the battery cell and effectively improving the performance of the battery cell.

[0004] According to an embodiment of the present invention, a battery cell comprises a top cover assembly; a pole, wherein the pole is passed through the top cover assembly; a first pole group and a second pole group, wherein the first pole group and the second pole group are located on the same side in the thickness direction of the top cover assembly and are spaced apart along the width direction of the top cover assembly, and the pole lugs of the first pole group and the pole lugs of the second pole group are directly connected to the poles, respectively.

[0005] According to the battery cell of the embodiment of the present invention, the pole is provided in the top cover assembly, the first pole group and the second pole group are located on the same side of the thickness direction of the top cover assembly and are arranged at intervals along the width direction of the top cover assembly, and the pole ears of the first pole group and the pole ears of the second pole group are directly connected to the pole, so that the current of the first pole group and the second pole group is directly drawn out through the pole, thereby shortening the current flow path, thereby reducing the internal resistance of the battery cell, effectively improving the performance of the battery cell, shortening the battery cell assembly process, improving assembly efficiency, reducing costs, and effectively improving the product competitiveness of the battery cell. At the same time, the pole ears of the first pole group and the pole ears of the second pole group are directly connected to the pole, so that the current of the first pole group and the second pole group is transmitted to the pole, respectively, avoiding the problem of uneven current distribution that may be caused by series connection, and further improving the overall performance of the battery cell.

[0006] In some embodiments of the present invention, the first pole group and the second pole group both include a pole group body, and the pole lug is located on a side of the corresponding pole group body facing the pole column and is connected to the corresponding pole group body.

[0007] In some embodiments of the present invention, a groove is provided on the end surface of the pole column facing the pole group body, and the pole ear of the first pole group and the pole ear of the second pole group are directly connected to the bottom wall of the groove and are partially located in the groove.

[0008] In some embodiments of the present invention, the pole lug of the first pole group and the pole lug of the second pole group both include a connecting section and a transition section, the connecting section extends along the width direction of the top cover assembly, and the transition section extends along the thickness direction of the top cover assembly, the connecting section of the first pole group and the connecting section of the second pole group are spaced apart from each other at one end and connected to the corresponding transition section at one end facing away from each other, the end of the transition section facing away from the connecting section is connected to the corresponding pole group body, and the connecting section is connected to the bottom wall of the groove.

[0009] In some embodiments of the present invention, the top cover assembly includes: a cover body, a mounting hole is provided on the cover body, and the pole is inserted into the mounting hole; a support block, the support block is sleeved on the pole and is located on the side of the cover body facing the first pole group, and an end of the pole close to the first pole group is bent toward the side close to the support block to be connected to the support block.

[0010] In some embodiments of the present invention, the bending angle of one end of the pole close to the pole group is 5°-75°.

[0011] In some embodiments of the present invention, the top cover assembly also includes: a seal, which is sleeved on the outer peripheral wall of the pole and penetrates into the mounting hole, and the seal is located on the side of the support block away from the first pole group, and is used to seal the gap between the support block and the pole and the gap between the support block and the cover body.

[0012] In some embodiments of the present invention, the pole includes a main body and a raised portion, the raised portion is located at one end of the main body away from the first pole group and surrounds the main body, the sealing member is sleeved on the outer peripheral wall of the main body, and the top cover assembly also includes: an insulating member, the insulating member is located on a side of the sealing member away from the first pole group and abuts against the sealing member, the insulating member is sleeved on the main body and the raised portion, and is used to seal the gap between the pole and the cover body.

[0013] In some embodiments of the present invention, there are two poles spaced apart along the length direction of the top cover assembly, the pole ears of the first pole group and the second pole group both include a positive pole ear and a negative pole ear, the positive pole ear of the first pole group and the positive pole ear of the second pole group are directly connected to one of the poles, and the negative pole ear of the first pole group and the negative pole ear of the second pole group are directly connected to the other pole.

[0014] In some embodiments of the present invention, the present invention further comprises: a shell, one side of the shell is open to form an opening, the top cover assembly is covered on the opening, and the first pole group and the second pole group are located in the shell.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a structural diagram of a battery cell according to an embodiment of the present invention;

[0018] Figure 2 is a top view of a battery cell according to an embodiment of the present invention;

[0019] Figure 3 is along Figure 2 Sectional view along line AA;

[0020] Figure 4 yes Figure 3 Enlarged view of point B in the middle;

[0021] Figure 5 is a schematic diagram of the coordination of a battery cell according to an embodiment of the present invention, wherein the housing is not shown;

[0022] Figure 6 yes Figure 5 A cross-sectional view of

[0023] Figure 7 yes Figure 6 Enlarged view of point C in the middle;

[0024] Figure 8 is a structural diagram of a top cover assembly and a pole according to an embodiment of the present invention;

[0025] Fig. 9 yes Figure 8 A top view of

[0026] Fig.10 is along Fig. 9 Sectional view along line DD.

[0027] Reference numerals:

[0028] 100. Battery cell;

[0029] 1. Top cover assembly; 11. Cover body; 111. Mounting hole; 12. Support block; 14. Sealing member; 141. First sealing portion; 142. Second sealing portion; 15. Insulating member;

[0030] 2. Pole; 21. Main body; 211. Groove; 22. Raised part; 23. Connecting part;

[0031] 31, first pole group; 311, pole ear; 3111, connecting section; 3112, transition section; 312, pole group body; 32, second pole group;

[0032] 4. Shell. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] A battery cell 100 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0037] like Figure 1-Figure 4 As shown, the battery cell 100 according to the embodiment of the present invention comprises a top cover assembly 1, a pole 2, a first pole group 31 and a second pole group 32. The pole 2 is disposed through the top cover assembly 1, and the first pole group 31 and the second pole group 32 are located in the thickness direction of the top cover assembly 1 (such as Figure 3 The first direction shown in FIG. 1 is on the same side as the first direction shown in FIG. 1 and along the width direction of the top cover assembly 1 (as shown in FIG. Figure 3The pole lugs 311 of the first pole group 31 and the pole lugs 311 of the second pole group 32 are directly connected to the pole column 2 respectively.

[0038] Thus, the pole lugs 311 of the first pole group 31 and the pole lugs 311 of the second pole group 32 are directly connected to the pole 2, so that the current of the first pole group 31 and the second pole group 32 are directly drawn out through the pole 2, thereby shortening the current flow path, thereby reducing the internal resistance of the battery cell 100, and effectively improving the performance of the battery cell 100. At the same time, compared with the prior art solution in which multiple pole groups are indirectly connected to the pole through a connecting sheet, the present application directly connects the pole lugs 311 of the first pole group 31 and the pole lugs 311 of the second pole group 32 to the pole 2, while reducing the internal resistance of the battery cell 100, shortening the assembly process of the battery cell 100, improving assembly efficiency, reducing costs, and effectively improving the product competitiveness of the battery cell 100.

[0039] By having the first pole group 31 and the second pole group 32 in a battery cell 100, the capacity of the battery cell 100 is effectively increased and the burden of a single pole group is reduced. At the same time, the first pole group 31 and the second pole group 32 are arranged at intervals along the width direction of the top cover assembly 1 to ensure the heat dissipation of the two, and effectively improve the overall performance and stability of the battery cell 100. In addition, the pole lug 311 of the first pole group 31 and the pole lug 311 of the second pole group 32 are directly connected to the pole 2 respectively, so that the current of the first pole group 31 and the second pole group 32 are respectively transmitted to the pole, avoiding the problem of uneven current distribution that may be caused by series connection, and further improving the overall performance of the battery cell.

[0040] Furthermore, the first pole group 31 and the pole 2 are directly welded and connected, the second pole group 32 and the pole 2 are directly welded and connected, and one end of the pole 2 away from the first pole group 31 is welded and connected to the bus, so that the current of the first pole group 31 and the second pole group 32 is transmitted to the bus through the pole 2.

[0041] In some embodiments, the pole 2 can be formed by stamping in one step without secondary processing, which is simple to manufacture and has high connection strength, which is conducive to reducing processing costs, reducing assembly processes, and improving production efficiency.

[0042] According to the battery cell 100 of the embodiment of the present invention, the pole 2 is provided in the top cover assembly 1, the first pole group 31 and the second pole group 32 are located on the same side of the thickness direction of the top cover assembly 1 and are arranged at intervals along the width direction of the top cover assembly 1, and the pole lugs 311 of the first pole group 31 and the pole lugs 311 of the second pole group 32 are directly connected to the pole 2 respectively, so that the current of the first pole group 31 and the second pole group 32 are directly led out through the pole 2, thereby shortening the current flow path, thereby reducing the internal resistance of the battery cell 100, effectively improving the performance of the battery cell 100, shortening the assembly process of the battery cell 100, improving the assembly efficiency, reducing the cost, and effectively improving the product competitiveness of the battery cell 100. At the same time, the pole lugs 311 of the first pole group 31 and the pole lugs 311 of the second pole group 32 are directly connected to the pole 2 respectively, so that the current of the first pole group 31 and the second pole group 32 are respectively transmitted to the pole, avoiding the problem of uneven current distribution that may be caused by series connection, and further improving the overall performance of the battery cell.

[0043] In some embodiments of the present invention, Figure 2-Figure 7 As shown, both the first pole group 31 and the second pole group 32 include a pole group body 312, and the pole lug 311 is located on the side of the corresponding pole group body 312 facing the pole column 2 and connected to the corresponding pole group body 312. Thus, through such an arrangement, the pole group body 312 of the first pole group 31 is electrically connected to the pole column 2 through the pole lug 311 of the first pole group 31, and the pole group body 312 of the second pole group 32 is electrically connected to the pole column 2 through the pole lug 311 of the second pole group 32, thereby improving the reliability of the battery cell 100. At the same time, the pole lug 311 is located on the side of the corresponding pole group body 312 facing the pole column 2, so that the pole lug 311 is conveniently connected to the pole column 2, and the length of the pole lug 311 can be shortened, thereby ensuring a compact structure and reducing the volume of the battery cell 100.

[0044] In some embodiments of the present invention, Figure 2-Figure 7 As shown, a groove 211 is provided on the end surface of the pole column 2 facing the pole group body 312 and is recessed away from the pole group body 312 . The pole ear 311 of the first pole group 31 and the pole ear 311 of the second pole group 32 are directly connected to the bottom wall of the groove 211 and are partially located in the groove 211 .

[0045] Thus, the first pole group 31 and the second pole group 32 are directly connected to the bottom wall of the groove 211, so as to realize the electrical connection between the first pole group 31 and the pole column 2 and the electrical connection between the second pole group 32 and the pole column 2. At the same time, the weight of the pole column 2 can be reduced by setting the groove 211, so that the weight of the battery cell 100 can be reduced, which is conducive to reducing production costs. In addition, by partially locating the pole lugs 311 of the first pole group 31 and the second pole group 32 in the groove 211, the space of the battery cell 100 is further rationalized, the space occupied by the pole lugs 311 is reduced, the structure is compact, and the space utilization rate can be improved. Optionally, the pole lugs 311 of the first pole group 31 and the pole lugs 311 of the second pole group 32 are penetrated and welded to the bottom wall of the groove 211.

[0046] In some embodiments of the present invention, Figure 2-Figure 7 As shown, the pole ear 311 of the first pole group 31 and the pole ear 311 of the second pole group 32 both include a connecting section 3111 and a transition section 3112, the connecting section 3111 extends along the width direction of the top cover assembly 1, and the transition section 3112 extends along the thickness direction of the top cover assembly 1, the connecting section 3111 of the first pole group 31 and the connecting section 3111 of the second pole group 32 are spaced apart from each other at one end and connected to the corresponding transition section 3112 at one end away from each other, the transition section 3112 is connected to the corresponding pole group body 312 at one end away from the connecting section 3111, and the connecting section 3111 is connected to the bottom wall of the groove 211.

[0047] Thus, the contact area between the connecting section 3111 and the bottom wall of the groove 211 can be increased by such a configuration, thereby improving the connection strength between the pole lug 311 and the pole 2, and improving the overall reliability of the battery cell 100. At the same time, the connecting section 3111 of the first pole group 31 and the connecting section 3111 of the second pole group 32 are spaced apart toward one end of each other to avoid short circuits, thereby further improving the safety and reliability of the battery cell 100.

[0048] Specifically, when the battery cell 100 is assembled, the first electrode group 31 and the second electrode group 32 can be connected as follows: Figure 5-Figure 7 As shown in the figure, they are flipped at a certain angle in the direction away from each other, so that the transition section 3112 of the first pole group 31 and the transition section 3112 of the second pole group 32 are tilted in the direction away from each other, thereby providing a connecting channel between the connecting section 3111 of the first pole group 31 and the bottom wall of the groove 211 and the connecting section 3111 of the second pole group 32 and the bottom wall of the groove 211, so as to meet the requirements of penetrating welding connection between the connecting section 3111 of the first pole group 31 and the bottom wall of the groove 211 and the connecting section 3111 of the second pole group 32 and the bottom wall of the groove 211, so that the connection is convenient and it is beneficial to improve the assembly efficiency.

[0049] In some embodiments of the present invention, Figure 4-Figure 10 As shown, the top cover assembly 1 includes a cover body 11 and a support block 12. The cover body 11 is provided with a mounting hole 111, the pole 2 is inserted into the mounting hole 111, the support block 12 is sleeved on the pole 2 and is located on the side of the cover body 11 facing the first pole group 31, and the end of the pole 2 close to the first pole group 31 is bent toward the side close to the support block 12 to be connected to the support block 12.

[0050] Thus, the pole 2 is assembled through the mounting hole 111, and the pole 2 is fixed through the support block 12, thereby ensuring the stability of the pole 2. Specifically, by bending the end of the pole 2 close to the first pole group 31 toward the side close to the support block 12, it is convenient for the end of the pole 2 close to the first pole group 31 to be connected to the support block 12, and a supporting force point can be provided to ensure that the pole 2 is reliably connected to the support block 12, thereby ensuring that the pole 2 is reliably fixed on the cover body 11, ensuring the connection between the pole 2 and the pole ear 311, and improving the overall reliability. For example, the end of the pole 2 close to the first pole group 31 is welded to the support block 12.

[0051] In some embodiments of the present invention, Figure 4 , Figure 7 and Fig.10 As shown, the bending angle of the end of the pole 2 close to the pole group is 5°-75°, that is, the bending angle of the end of the pole 2 close to the first pole group 31 is α and satisfies 5°≤α≤75°. Within the above range, the connection effect between the support block 12 and the pole 2 can be guaranteed, the connection reliability can be ensured, and the bending difficulty of the end of the pole 2 close to the first pole group 31 can be reduced, which is convenient for assembly, and at the same time, problems such as excessive bending causing the pole 2 to break or poor connection can be avoided. For example, in some specific embodiments, the bending angle of the end of the pole 2 close to the first pole group 31 can be 5°, 15°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60° or 75°, etc.

[0052] In some embodiments of the present invention, Figure 4 , Figure 7 and Fig.10 As shown, the top cover assembly 1 also includes a seal 14, which is sleeved on the outer peripheral wall of the pole 2 and penetrates the mounting hole 111. The seal 14 is located on the side of the support block 12 away from the first pole group 31, and is used to seal the gap between the support block 12 and the pole 2 and the gap between the support block 12 and the cover body 11. Therefore, the gap between the support block 12 and the pole 2 and the gap between the support block 12 and the cover body 11 are sealed by the seal 14, ensuring reliable sealing at the mounting hole 111, preventing the electrolyte or other chemicals inside the battery cell 100 from leaking to the outside, and ensuring the insulation between the cover body 11 and the support block 12, ensuring the safety of the battery cell 100.

[0053] Furthermore, the seal 14 includes a first sealing portion 141 and a second sealing portion 142. The first sealing portion 141 is formed in a ring shape, one end of the second sealing portion 142 is connected to an end of the first sealing portion 141 away from the first pole group 31, and the other end of the second sealing portion 142 extends toward a side away from the first sealing portion 141, and along the radial direction of the first sealing portion 141, the second sealing portion 142 is located between the cover body 11 and the pole 2, which can achieve sealing between the cover body 11 and the pole 2, ensure the sealing reliability at the mounting hole 111, ensure the safety of the battery cell 100, and the seal 14 has a simple structure and is easy to process and manufacture.

[0054] In some embodiments of the present invention, Figure 4 , Figure 7 and Fig.10 As shown, the pole 2 includes a body portion 21 and a protrusion 22, the protrusion 22 is located at one end of the body portion 21 away from the first pole group 31 and surrounds the body portion 21, the sealing member 14 is sleeved on the outer peripheral wall of the body portion 21, and the top cover assembly 1 also includes an insulating member 15. Among them, the insulating member 15 is located on the side of the sealing member 14 away from the first pole group 31 and abuts against the sealing member 14, and the insulating member 15 is sleeved on the body portion 21 and the protrusion 22, and is used to seal the gap between the pole 2 and the cover body 11.

[0055] Thus, the gap between the pole 2 and the cover body 11 is sealed by the insulating member 15, thereby ensuring the sealing and insulation effect between the pole 2 and the cover body 11, and improving the overall reliability. At the same time, the insulating member 15 is sleeved on the body part 21 and the protruding part 22, so that the insulating member 15 abuts against the body part 21 and the cover body 11 respectively, further ensuring that the pole 2 is reliably fixed on the cover body 11, thereby ensuring the connection between the pole 2 and the pole ear 311, and improving the overall reliability.

[0056] Furthermore, a groove 211 is provided on the end surface of the main body 21 facing the pole group body 312 and is recessed away from the pole group body 312 . Parts of the pole ears 311 of the first pole group 31 and the second pole group 32 are located in the groove 211 and are directly connected to the bottom wall of the groove 211 .

[0057] Furthermore, the pole 2 further includes a connecting portion 23, which is located at one end of the body 21 close to the first pole group 31 and surrounds the body 21, and the connecting portion 23 is bent toward a side close to the support block 12 to be connected to the support block 12. Thus, such an arrangement ensures that the pole 2 is reliably fixed on the cover body 11, ensures the connection between the pole 2 and the pole lug 311, and improves the overall reliability.

[0058] Furthermore, the insulating member 15 is sleeved on the outer peripheral wall of the main body 21 and the protruding portion 22, thereby further ensuring that the pole 2 is reliably fixed on the cover body 11, thereby ensuring the connection between the pole 2 and the pole lug 311, and improving the overall reliability.

[0059] In some embodiments of the present invention, Figure 1-Figure 4 As shown, the pole 2 is along the length direction of the top cover assembly 1 (such as Figure 2 The first pole group 31 and the second pole group 32 each include a positive pole ear and a negative pole ear. The positive pole ear of the first pole group 31 and the positive pole ear of the second pole group 32 are directly connected to one of the poles 2, and the negative pole ear of the first pole group 31 and the negative pole ear of the second pole group 32 are directly connected to the other pole 2.

[0060] Thus, the positive electrode and the negative electrode of the battery cell 100 of the present application are led out from the same side through such an arrangement. Specifically, the pole 2 connected to the positive pole tab of the first pole group 31 and the positive pole tab of the second pole group 32 is a positive pole pole, and the pole 2 connected to the negative pole tab of the first pole group 31 and the negative pole tab of the second pole group 32 is a negative pole pole, thereby achieving the connection requirements between the first pole group 31 and the second pole group 32 and the two poles 2 respectively.

[0061] In some embodiments of the present invention, Figure 1 and Figure 3 As shown, the battery cell 100 further includes a housing 4. One side of the housing 4 is open to form an opening, the top cover assembly 1 is covered on the opening, and the first pole group 31 and the second pole group 32 are located in the housing 4. Thus, the first pole group 31 and the second pole group 32 can be protected by the housing 4 to prevent the first pole group 31 and the second pole group 32 from being exposed and damaged, which is beneficial to prolonging the service life of the first pole group 31 and the second pole group 32. At the same time, the sealing between the housing 4 and the top cover assembly 1 is ensured by the top cover assembly 1 covering the opening, further improving the reliability and safety of the battery cell 100.

[0062] In some embodiments of the present invention, the assembly process of the battery cell 100 is as follows: first, the pole 2 is passed through the cover body 11, and then the support block 12 is sleeved on the pole 2 and located on the side of the cover body 11 facing the first pole group 31, and the end of the pole 2 close to the first pole group 31 is bent toward the side close to the support block 12 to connect with the support block 12, and then the seal 14 and the insulating member 15 are sleeved on the pole 2, and then the first pole group 31 and the second pole group 32 are flipped at a certain angle in a direction away from each other so that the pole ear 311 of the first pole group 31 and the pole ear 311 of the second pole group 32 extend into the groove 211 of the pole 2 and are directly welded to the bottom wall of the groove 211.

[0063] Other structures and operations of the battery cell 100 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0065] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: Top cover assembly; A pole, the pole being passed through the top cover assembly; A first pole group and a second pole group, wherein the first pole group and the second pole group are located on the same side of the top cover assembly in the thickness direction and are spaced apart along the width direction of the top cover assembly, and the pole ears of the first pole group and the pole ears of the second pole group are directly connected to the pole column respectively.

2. The battery cell according to claim 1, characterized in that: The first pole group and the second pole group both include a pole group body, and the pole lug is located on a side of the corresponding pole group body facing the pole column and is connected to the corresponding pole group body.

3. The battery cell according to claim 2, characterized in that: A groove is provided on the end surface of the pole column facing the pole group body and is recessed away from the pole group body. The pole lugs of the first pole group and the pole lugs of the second pole group are directly connected to the bottom wall of the groove and are partially located in the groove.

4. The battery cell according to claim 3, characterized in that: The pole lug of the first pole group and the pole lug of the second pole group both include a connecting section and a transition section, the connecting section extends along the width direction of the top cover assembly, and the transition section extends along the thickness direction of the top cover assembly, the connecting section of the first pole group and the connecting section of the second pole group are spaced apart from each other at one end and connected to the corresponding transition section at one end facing away from each other, the end of the transition section facing away from the connecting section is connected to the corresponding pole group body, and the connecting section is connected to the bottom wall of the groove.

5. The battery cell according to claim 1, characterized in that: The top cover assembly comprises: A cover body, wherein the cover body is provided with a mounting hole, and the pole is passed through the mounting hole; A support block is sleeved on the pole and located on a side of the cover body facing the first pole group, and an end of the pole close to the first pole group is bent toward a side close to the support block to be connected to the support block.

6. The battery cell according to claim 5, characterized in that: The bending angle of one end of the pole close to the pole group is 5°-75°.

7. The battery cell according to claim 5, characterized in that: The top cover assembly also includes: A sealing member is sleeved on the outer peripheral wall of the pole and penetrated into the mounting hole. The sealing member is located on a side of the support block away from the first pole group and is used to seal the gap between the support block and the pole and the gap between the support block and the cover body.

8. The battery cell according to claim 7, characterized in that: The pole comprises a body and a protrusion, wherein the protrusion is located at one end of the body away from the first pole group and surrounds the body, the sealing member is sleeved on the outer peripheral wall of the body, and the top cover assembly further comprises: An insulating member is located on a side of the sealing member away from the first pole group and abuts against the sealing member. The insulating member is sleeved on the main body and the raised portion and is used to seal the gap between the pole and the cover body.

9. The battery cell according to claim 1, characterized in that: There are two poles spaced apart along the length direction of the top cover assembly, and the pole ears of the first pole group and the second pole group both include a positive pole ear and a negative pole ear, the positive pole ear of the first pole group and the positive pole ear of the second pole group are directly connected to one of the poles, and the negative pole ear of the first pole group and the negative pole ear of the second pole group are directly connected to the other pole.

10. The battery cell according to claim 1, characterized in that: Also includes: A shell, one side of which is open to form an opening, the top cover assembly is covered on the opening, and the first pole group and the second pole group are located in the shell.

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