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, and is characterized in that the shell is provided with mounting holes; the pole group is positioned in the shell; the pole columns are arranged in the mounting holes in a penetrating manner and are connected with the pole groups; the welding block is arranged on the pole in a sleeving mode and located on the side, close to the pole group, of the pole, the end, close to the pole group, of the pole is bent towards the side close to the welding block so as to be connected with the welding block, and the bending angle of the end, close to the pole group, of the pole is 5-75 degrees. According to the single battery disclosed by the utility model, one end, close to the pole group, of the pole post is bent towards one side close to the welding block to be connected with the welding block, and the bending angle of the end, close to the pole group, of the pole post is 5-75 degrees, so that a supporting stress point is provided for the pole post, and reliable connection between the pole post and the welding block is ensured; therefore, the pole can be reliably fixed on the shell, the connection between the pole and the pole group is ensured, the pole is simple in structure and convenient to process, manufacture and assemble, 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 connection between the pole and the welding block is unreliable, so that the pole is not reliably fixed on the shell, and problems such as loosening are prone to occur, and the structure of the pole is complex, thereby increasing the production cost. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the prior art is solved, for this purpose, one object of the utility model is to provide a battery monomer, the battery monomer can ensure that the pole is reliably fixed on the shell, guarantees the connection between the pole and the pole group, and makes the structure of the pole simple, facilitates processing and manufacturing and assembly, and can reduce the production cost.

[0004] The battery monomer according to the utility model embodiment, including: shell, the shell has mounting hole;Pole group, the pole group is located in the shell;Pole, the pole is worn in the mounting hole and is connected with the pole group;Welding block, the welding block is sleeved on the pole and is located on the side of the pole close to the pole group, the end of the pole close to the pole group is bent to the side close to the welding block to be connected with the welding block, and the bending angle of the end of the pole close to the pole group is 5 °-75 °.

[0005] The battery monomer according to the utility model embodiment, the shell has mounting hole, the pole is worn in the mounting hole and is connected with the pole group, the welding block is sleeved on the pole and is located on the side of the pole close to the pole group, the end of the pole close to the pole group is bent to the side close to the welding block to be connected with the welding block, and the bending angle of the end of the pole close to the pole group is 5 °-75 °, thereby providing a support stress point, ensuring that the pole is reliably connected with the welding block, so that the pole can be reliably fixed on the shell, the connection between the pole and the pole group is guaranteed, and the structure of the pole is simple, facilitating processing and manufacturing and assembly, and the production cost can be reduced.

[0006] In some embodiments of the utility model, the pole includes: a body portion, the body portion is worn in the mounting hole and is connected with the pole group;Connecting portion, the connecting portion is formed into annular and is connected with the end of the body portion close to the pole group, and the end of the connecting portion close to the pole group is bent to the side close to the welding block to be connected with the welding block.

[0007] In some embodiments of the utility model, the end face of the body portion close to the connecting portion is provided with the recess recessed towards the direction away from the connecting portion.

[0008] In some embodiments of the utility model, still include: sealing piece, sealing piece is set on the connecting portion and is located the welding block's far from the pole group's one side, the radial inner side of sealing piece is opposite with the body portion, the radial outer side of sealing piece is opposite with the shell.

[0009] In some embodiments of the utility model, the end of the body portion close to the connecting portion and the end of the shell close to the pole group are flush.

[0010] In some embodiments of the utility model, the body portion extends to the side away from the pole group beyond the mounting hole.

[0011] In some embodiments of the utility model, the welding block is provided with a through hole for avoiding the pole column, and the welding block is provided with an avoiding groove around the through hole on the end face close to the pole group, and the end of the pole column close to the pole group is located on the side of the avoiding groove away from the pole group.

[0012] In some embodiments of the utility model, the shell comprises: a shell body, one side of the shell body is open to form an opening, and the pole group is arranged in the shell body; a cover body, the mounting hole is arranged on the cover body, the cover body is arranged on the opening, and the welding block is arranged on the side of the cover body close to the pole group.

[0013] In some embodiments of the utility model, the pole group comprises: 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 spaced apart along the width direction of the first pole group, and the first pole group and the second pole group are connected with the pole column respectively.

[0014] In some embodiments of the utility model, further comprising: a connecting piece, two ends of the connecting piece in the length direction are connected with the first pole group and the second pole group respectively, and the middle region of the connecting piece protrudes towards the side close to the pole column and is connected with the pole column.

[0015] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0017] Figure 1 is the structure schematic diagram of battery monomer according to the utility model embodiments;

[0018] Figure 2 is the plan view of battery monomer according to the utility model embodiments.

[0019] Figure 3 is Figure 2 a sectional view along the direction indicated by line A-A;

[0020] Figure 4 is Figure 2 a sectional view along the direction indicated by line B-B;

[0021] Figure 5 is Figure 4 an enlarged view of a portion C;

[0022] Figure 6 is a structural schematic view of a cover plate, a pole, a welding block, a sealing member and an upper plastic according to an embodiment of the present application;

[0023] Figure 7 is Figure 6 a plan view;

[0024] Figure 8 is Figure 7 a sectional view along the direction indicated by line D-D;

[0025] Figure 9 is Figure 6 a bottom view;

[0026] Figure 10 is a structural schematic view of a battery monomer assembly according to an embodiment of the present application, wherein a shell body is not shown;

[0027] Figure 11 is Figure 10 a plan view;

[0028] Figure 12 is a sectional view along the direction indicated by line D-D in Figure 11 ;

[0029] Figure 13 is Figure 12 an enlarged view of a portion E;

[0030] Figure 14 is a partial structural schematic view of a battery monomer according to an embodiment of the present application, wherein only a first pole group, a second pole group and a connecting member are shown;

[0031] Figure 15 is Figure 14 a plan view;

[0032] Figure 16 is a sectional view along the direction indicated by line F-F in Figure 15 ;

[0033] Figure 17 is Figure 16 an enlarged view of a portion G;

[0034] Figure 18 is a partial structure schematic diagram of a battery monomer assembly according to an embodiment of the present application, wherein only a first pole group, a second pole group and a connecting piece are shown;

[0035] Figure 19 is a top view of Figure 18 ;

[0036] Figure 20 is a sectional view along the direction shown by the line H-H in Figure 19 ;

[0037] Figure 21 is an enlarged view at I in Figure 20 ;

[0038] Reference signs:

[0039] 100, battery monomer;

[0040] 10, cover body; 11, mounting hole;

[0041] 20, pole post; 21, body part; 22, connecting part; 23, protruding part; 211, recess;

[0042] 30, welding block; 31, through hole; 32, avoiding slot;

[0043] 40, sealing piece; 41, first sealing part; 42, second sealing part;

[0044] 50, shell; 51, shell body; 511, opening; 52, pole group; 521, first pole group; 522, second pole group;

[0045] 61, connecting piece; 62, upper plastic. DETAILED DESCRIPTION

[0046] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0047] In the description of the utility model, it needs to understand that the orientation or positional relationship indicated by 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" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model.

[0048] In the description of the utility model, "first feature", "second feature" can include one or more features, and the meaning of "multiple" is two or more than two, and "above" or "below" the first feature in the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them, and "above", "above" and "above" the first feature in the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature.

[0049] The battery monomer 100 according to the embodiment of the utility model is described below with reference to the drawings.

[0050] Referring to Figures 1-13 The battery monomer 100 according to the embodiment of the utility model includes a shell 50, a pole group 52, a pole 20 and a welding block 30, as shown.

[0051] Among them, the shell 50 has a mounting hole 11, the pole group 52 is located in the shell 50, the pole 20 is arranged in the mounting hole 11 and connected with the pole group 52, so that the current of the pole group 52 can be led out through the pole 20.

[0052] The welding block 30 is sleeved on the pole 20 and located on the side of the pole 20 close to the pole group 52 (for example, the lower side shown in (For example Figure 5 The end of the pole 20 close to the pole group 52 (for example, the lower end shown in Figure 5 The end of the pole 20 close to the pole group 52 (for example, the lower end shown in

[0053] At the same time, as Figure 5As shown, the bending angle of the end of the pole column 20 close to the pole group 52 is 5°-75°, that is, the bending angle of the end of the pole column 20 close to the pole group 52 is α and satisfies 5°≤α≤75°. Within the above range, the connection effect of the welding block 30 and the pole column 20 can be further ensured, the connection reliability is ensured, the bending difficulty of the end of the pole column 20 close to the pole group 52 is reduced, the assembly is facilitated, and problems such as fracture or poor connection of the pole column 20 caused by excessive bending are avoided. For example, in some specific embodiments, the bending angle of the end of the pole column 20 close to the pole group 52 can be 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70° or 75°, etc.

[0054] It can be understood that the "pole column 20" herein can be at least one of the positive pole column and the negative pole column of the battery monomer 100.

[0055] It should be noted that, for the convenience of description, the "front", "rear", "upper" and "lower" directions in the utility model are based on the orientation relationship shown in the drawings, and are not a limitation on the orientation in the actual application process.

[0056] According to the battery monomer of the utility model embodiment, the shell 50 has a mounting hole 11, the pole column 20 is arranged in the mounting hole 11 and connected with the pole group 52, the welding block 30 is sleeved on the pole column 20 and located on the side of the pole column 20 close to the pole group 52, the end of the pole column 20 close to the pole group 52 is bent towards the side close to the welding block 30 to be connected with the welding block 30, and the bending angle of the end of the pole column 20 close to the pole group 52 is 5°-75°, thereby providing a support stress point, ensuring reliable connection between the pole column 20 and the welding block 30, and ensuring reliable fixation of the pole column 20 on the shell 50, guaranteeing the connection between the pole column 20 and the pole group 52, and making the structure of the pole column 20 simple, facilitating processing, manufacturing and assembly, and reducing production cost.

[0057] In some embodiments of the utility model, as shown in Figure 1 and Figure 3 As shown, the shell 50 includes a shell body 51 and a cover 10. The shell body 51 is open on one side to form an opening 511, the pole group 52 is arranged in the shell body 51, the cover 10 has a mounting hole 11, the cover 10 is arranged on the opening 511, and the welding block 30 is located on the side of the cover 10 close to the pole group 52. Thus, the shell body 51 and the cover 10 can protect the pole group 52, avoid damage caused by exposure of the pole group 52, facilitate installation of the pole group 52 through the opening 511, and improve the assembly efficiency of the battery monomer 100. For example, the cover 10 can be an aluminum plate or the like.

[0058] Since the battery monomer 100 according to the embodiment of the utility model has the beneficial technical effects as above, the battery monomer 100 according to the embodiment of the utility model, through the welding block 30 being sleeved on the pole 20 and being located at the side of the cover 10 close to the pole group 52 of the battery monomer 100, the end of the pole 20 close to the pole group 52 is bent to the side close to the welding block 30 to be connected with the welding block 30, the end of the pole 20 close to the pole group 52 is connected with the welding block 30, the connection between the pole 20 and the welding block 30 is reliable, the pole 20 is fixed on the shell 50 reliably, the connection between the pole 20 and the pole group 52 is ensured, and the structure of the pole 20 is simple, so that the pole 20 is convenient to process, manufacture and assemble.

[0059] In some embodiments of the utility model, as shown in Figure 5 , the pole 20 comprises a body part 21, the body part 21 is arranged in the mounting hole 11 and connected with the pole group 52, so that the current of the pole group 52 can be led out through the pole 20.

[0060] In addition, as shown in Figure 5 , the pole 20 further comprises a connecting part 22, the connecting part 22 is formed in a ring shape, and the connecting part 22 is connected with the end (for example, the lower end shown in Figure 5 ) of the body part 21 close to the pole group 52, and the end of the connecting part 22 close to the pole group 52 is bent to the side close to the welding block 30, so that the connecting part 22 can be connected with the welding block 30, the connection is reliable, and the connecting part 22 is formed in a ring shape, so that the bending is convenient, the structure is simple, the weight of the pole 20 is reduced, and the production cost is reduced.

[0061] In some embodiments of the utility model, as shown in Figure 5 , Figures 10-18 , the body part 21 extends out of the mounting hole 11 to the side (for example, the upper side shown in Figure 5 ) away from the pole group 52, the connection requirement of the pole 20 and the external structure can be met, so that the connection requirement of the battery monomer 100 is realized.

[0062] In some embodiments of the utility model, as shown in Figure 5 , a groove 211 is arranged on the end face (for example, the lower end face shown in Figure 5 ) of the body part 21 close to the connecting part 22, and the groove 211 is recessed to the direction (for example, the upper direction shown in Figure 5 ) away from the connecting part 22, so that the weight of the pole 20 is reduced, the weight of the battery monomer 100 is reduced, the weight of the battery monomer 100 is reduced, the lightweight design of the battery monomer 100 is realized, and the production cost is reduced.

[0063] In some embodiments of the utility model, as shown in Figure 4 ,Figure 5 , Figures 10-13 As shown, the pole group 52 includes a first pole group 521 and a second pole group 522. The first pole group 521 and the second pole group 522 are disposed inside the housing 50 and are spaced apart along the width direction of the first pole group 521. The first pole group 521 and the second pole group 522 are respectively connected to the pole post 20.

[0064] Understandably, the current from the first electrode group 521 and the second electrode group 522 is transferred to the terminals separately, avoiding the problem of uneven current distribution that may be caused by series connection, and further improving the overall performance of the battery cell. At the same time, by having the first electrode group 521 and the second electrode group 522 within a single battery cell 100, the capacity of the battery cell 100 is effectively increased, reducing the burden on individual electrode groups. Furthermore, the spacing between the first electrode group 521 and the second electrode group 522 along the width direction of the first electrode group 521 ensures heat dissipation for both, effectively improving the overall performance and stability of the battery cell 100.

[0065] In some embodiments of this utility model, such as Figure 5 , Figures 13-21 As shown, the battery cell also includes a connector 61. The two ends of the connector 61 along its length are connected to the first electrode group 521 and the second electrode group 522, respectively. The middle region of the connector 61 protrudes towards the side closest to the terminal post 20 and is connected to the terminal post 20. Thus, the first electrode group 521 and the second electrode group 522 are connected to the terminal post 20 via the connector 61.

[0066] At the same time, the connector 61 can be formed as follows Figure 17 The "U"-shaped structure shown avoids the risk of tearing of the electrode assembly connected to the connector due to bending of the connector during assembly in related technologies, thus improving yield. Furthermore, the middle area of ​​the connector 61 protrudes towards the side closest to the pole post 20, allowing the connector 61 to connect to the bottom wall of the groove 211, fulfilling the connection requirements between the electrode assembly 52 and the pole post 20. This ensures reliable connection and positioning, and results in a compact structure that reduces space occupation. For example, the connector 61 and the pole post 20 can be welded together.

[0067] Specifically, during the assembly of the battery cell 100, the first electrode group 521 and the second electrode group 522 can be connected as follows: Figures 10-13 and Figures 18-20 The first pole group 521 and the second pole group 522 are rotated at a certain angle in the direction away from each other, so that the first pole group 521 and the connector 61 and the second pole group 522 and the connector 61 are tilted in the direction away from each other, thereby providing a connection channel between the first pole group 521 and the connector 61 and the second pole group 522 and the connector 61, so as to meet the requirements of the through welding connection between the first pole group 521 and the connector 61 and the through welding connection between the second pole group 522 and the connector 61, making the connection convenient and improving the assembly efficiency.

[0068] Furthermore, during the assembly of the battery cell 100, such as Figure 13 As shown, the angle between the extending direction of the first pole group 521 and the extending direction of the second pole group 522 (e.g.) Figure 13 The β shown is 15°-60°. Thus, by limiting the angle in this way, the overall structural strength is guaranteed while ensuring the connection between the first pole group 521 and the connector 61 and the second pole group 522 and the connector 61.

[0069] Furthermore, during the assembly of the battery cell 100, such as Figure 13 As shown, the minimum distance between the first pole group 521 and the second pole group 522 (e.g.) Figure 13 The T1 shown is greater than 5mm. Thus, this angle limitation further provides a connection channel between the first pole group 521 and the connector 61, and between the second pole group 522 and the connector 61.

[0070] In some embodiments of this utility model, such as Figure 5 As shown, the battery cell 100 also includes a seal 40, which is sleeved on the connecting portion 22 and located on the side of the welding block 30 away from the electrode group 52 (e.g., Figure 5 As shown in the upper part, the radial inner side of the seal 40 abuts against the body part 21, which can achieve a seal between the pole post 20 and the welding block 30. The radial outer side of the seal 40 abuts against the housing 50, which can achieve a seal between the housing 50 and the welding block 30. This ensures a reliable seal at the mounting hole 11, prevents the electrolyte or other chemicals inside the battery cell 100 from leaking to the outside, and ensures the safety of the battery cell 100.

[0071] In some embodiments, such as Figure 5 As shown, the seal 40 includes a first sealing portion 41 and a second sealing portion 42. The first sealing portion 41 is formed in an annular shape, and one end of the second sealing portion 42 is connected to the end of the first sealing portion 41 that is away from the electrode assembly 52 (e.g., Figure 5 The upper end of the second sealing part 42 is connected to the first sealing part 41. The other end of the second sealing part 42 extends toward the side away from the first sealing part 41 and along the radial direction of the first sealing part 41. The second sealing part 42 is located between the cover 10 and the body part 21, which can realize the seal between the cover 10 and the pole post 20, ensure the sealing reliability at the mounting hole 11, ensure the safety of the battery cell 100, and the structure of the sealing part 40 is simple and easy to process and manufacture.

[0072] In some embodiments of this utility model, such as Figure 5 As shown, one end of the main body 21 near the connecting portion 22 (for example) Figure 5 The lower end shown) and one end of the cover 10 near the pole group 52 (e.g. Figure 5The lower end of the sealing member 40 is flush with the lower end of the lower end surface of the shell 50 (as shown in FIG. 1), which can make the compression amount of the radially inner side and the radially outer side of the sealing member 40 consistent, and ensure the sealing reliability.

[0073] In some embodiments of the utility model, as shown in Figure 5 The welding block 30 is provided with a through hole 31, which can avoid the pole 20 and facilitate the welding block 30 to be sleeved on the pole 20. Figure 5 The welding block 30 is provided with an avoiding groove 32 on the end face (for example, the lower end face shown in FIG. 1) close to the pole group 52, the avoiding groove 32 is arranged around the through hole 31, and the end of the pole 20 close to the pole group 52 is located on the side (for example, the upper side shown in FIG. 1) of the avoiding groove 32 away from the pole group 52. Figure 5 The avoiding groove 32 can avoid the welding points of the welding block 30 from protruding out of the welding block 30 when the welding block 30 is welded with the pole 20, thereby avoiding the interference or short circuit of the welding points with other structures, ensuring the safety of the battery monomer 100, facilitating the assembly, making the structure compact, and being beneficial to reducing the occupied space of the battery monomer 100.

[0074] In some embodiments of the utility model, as shown in Figure 5 The end of the pole 20 away from the pole group 52 is provided with a protruding part 23, the protruding part 23 extends along the circumferential direction of the pole 20, and the protruding part 23 can improve the structural strength of the pole 20 and ensure that the pole 20 is not easy to deform when connected with external structures.

[0075] In some embodiments, as shown in Figure 5 The battery monomer 100 further includes an upper plastic 62, the upper plastic 62 is located between the protruding part 23 and the cover 10, that is, the protruding part 23 abuts against the side (for example, the upper side shown in FIG. 1) of the cover 10 away from the pole group 52 through the upper plastic 62. Figure 5 The upper plastic 62 can insulate between the protruding part 23 and the cover 10, avoid short circuit or electric leakage, and ensure the safety of the battery monomer 100. Meanwhile, the end of the pole 20 close to the pole group 52 is bent towards the side close to the welding block 30 to be connected with the welding block 30, and the protruding part 23 abuts against the side of the cover 10 away from the pole group 52 through the upper plastic 62, which can ensure that the pole 20 is fixed reliably on the shell 50 and prevent the pole 20 from being easy to loosen, thereby ensuring the safety of the battery monomer 100.

[0076] It should be noted that when the battery monomer 100 is assembled, the pole 20 is arranged in the upper plastic 62, the cover 10, the sealing element 40 and the welding block 30, and then the end of the pole 20 close to the pole group 52 is bent towards the side close to the welding block 30, so that the end of the pole 20 close to the pole group 52 is connected with the welding block 30, the battery monomer 100 can be formed, the assembly of the battery monomer 100 is realized, the required connection requirement is met, and the parts of the cover plate in the related art can be reduced, thereby reducing the production cost.

[0077] In some embodiments, the pole 20 can be formed by one-time stamping without secondary processing, so that the manufacturing is simple, the connection strength is high, the processing cost is reduced, the assembly process is reduced, and the production efficiency is high.

[0078] Other configurations and operations of the battery monomer 100 according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.

[0079] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0080] In the description of the present application, 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 included in at least one embodiment or example of the present application. In the present application, 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.

[0081] Although the embodiments of the present application 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 present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, include: A housing having mounting holes; A pole assembly, wherein the pole assembly is located within the housing; A pole post, which passes through the mounting hole and is connected to the pole group; A welding block is sleeved on the pole post and located on the side of the pole post near the pole group. The end of the pole post near the pole group is bent toward the side near the welding block to connect with the welding block. The bending angle of the end of the pole post near the pole group is 5°-75°.

2. The battery cell according to claim 1, characterized in that, The pole includes: The main body portion passes through the mounting hole and is connected to the electrode assembly; A connecting portion, which is formed in an annular shape and connected to one end of the body portion near the electrode group, wherein the end of the connecting portion near the electrode group is bent toward the side near the welding block to connect with the welding block.

3. The battery cell according to claim 2, characterized in that, The end face of the main body near the connecting part is provided with a groove that is recessed in the direction away from the connecting part.

4. The battery cell according to claim 2, characterized in that, Also includes: A sealing element is fitted onto the connecting portion and located on the side of the welding block away from the pole assembly. The radially inner side of the sealing element abuts against the body portion, and the radially outer side of the sealing element abuts against the housing.

5. The battery cell according to claim 4, characterized in that, The end of the main body near the connecting portion is flush with the end of the housing near the pole assembly.

6. The battery cell according to claim 2, characterized in that, The mounting hole extends from the body portion toward the side away from the pole group.

7. The battery cell according to claim 1, characterized in that, The welding block has a through hole for avoiding the pole post, and the end face of the welding block near the pole group has an avoidance groove surrounding the through hole. The end of the pole post near the pole group is located on the side of the avoidance groove away from the pole group.

8. The battery cell according to claim 1, characterized in that, The housing includes: A shell body, one side of which is open to form an opening, and the pole assembly is disposed within the shell body; A cover body, wherein the cover body is provided with the mounting hole, the cover body covers the opening, and the welding block is located on the side of the cover body closer to the electrode assembly.

9. The battery cell according to any one of claims 1-8, characterized in that, The pole group includes: A first pole group and a second pole group are disposed inside the housing and spaced apart along the width direction of the first pole group. The first pole group and the second pole group are respectively connected to the pole post.

10. The battery cell according to claim 9, characterized in that, Also includes: A connector, the two ends of which are connected to the first pole group and the second pole group respectively in the length direction, and the middle area of ​​the connector protrudes towards the side close to the pole post and is connected to the pole post.

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