Battery cell and assembly method thereof, battery pack and vehicle

Abstract

The invention provides a battery cell and an assembly method thereof, a battery pack and a vehicle. The battery cell comprises a shell (11), and the shell (11) is internally provided with an accommodating space; the pole (12) is arranged on the shell (11), the pole (12) is provided with a through hole (12a), the hole axis of the through hole (12a) is arranged along the height direction of the pole (12), and the through hole (12a) is communicated with the accommodating space; at least part of the pole plate (22) penetrates into the through hole (12a) from the accommodating space and is connected with the pole column (12) in an electrically conductive manner; and the winding core (21) is arranged in the accommodating space, and at least part of the tab (211) of the winding core (21) penetrates into the through hole (12a) from the accommodating space and is conductively connected with the polar plate (22). In the embodiment, the pole plates (22) and the pole columns (12) are arranged in the through holes from inside to outside in the same direction, so that the connection impedance is reduced, and the quick charging requirement is met.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery cell and its assembly method, a battery pack, and a vehicle. Background Technology

[0002] In the cell structure of the relevant technology, a hollow pole base is installed on the cover plate of the cell, and a stepped structure is set on the inner wall of the hollow part. The pole lug of the core extends out from the through hole of the pole base and is welded to the pole on the outside. After welding, the pole lug is bent, the pole is pressed down to the stepped structure of the pole base, and finally the pole and the pole base are welded and sealed.

[0003] As can be seen, in this cell structure, the core is first installed inside the casing, and then the tabs and terminals are welded. Because the tab material is relatively soft, and the tab is located inside the through hole of the terminal base, it is inconvenient to fix the tab, which makes it difficult to align the tab with the terminal and results in poor welding convenience. In addition, the tab needs to extend out of the through hole of the terminal base before being welded to the terminal, and the length of the tab is relatively long, resulting in a large connection impedance of the cell. Summary of the Invention

[0004] The purpose of this application is to provide a battery cell, its assembly method, battery pack, and vehicle, which improves the ease of conductive connection operation and reduces the connection impedance of the battery cell.

[0005] To address the aforementioned technical problems, this application provides a battery cell, comprising:

[0006] A housing, the interior of which has a receiving space;

[0007] An electrode post is disposed on the housing, the electrode post having a through hole, the through hole axis being disposed along the height direction of the electrode post, and the through hole communicating with the receiving space;

[0008] An electrode plate, at least a portion of which passes through the receiving space into the through hole and is electrically connected to the electrode post;

[0009] A core is disposed within the receiving space, and at least a portion of the tabs of the core pass through the receiving space into the through hole and are electrically connected to the electrode plate.

[0010] In this embodiment of the battery cell, the terminal post is provided with a through hole for at least partially accommodating the tab and the electrode plate. During the cell forming process, before the core is installed inside the housing, the electrode plate and the tab can be electrically connected. For example, in this embodiment, the electrode plate and the tab are fixed by welding and assembled to form a core assembly. Then, the core assembly is installed inside the housing, with the electrode plate and the tab facing the through hole of the terminal post. The electrode plate and the tab are inserted into the through hole from the inside to the outside until the electrode plate and the terminal post are positioned and matched. Finally, the electrode plate and the terminal post are electrically connected. For example, in this embodiment, the electrode plate and the terminal post are fixed by welding.

[0011] Therefore, the structural form of the electrode plate and electrode post in this embodiment determines that the electrode plate and electrode tab can be welded before the core assembly is installed in the shell. Compared with the prior art where the electrode tab is located inside the through hole of the electrode post base and then welded, the electrode tab in this embodiment is not restricted by the shell and electrode post during welding, which makes it easier to fix the electrode tab and make the electrode tab and electrode plate better aligned. The welding operation of the electrode plate and electrode tab is convenient, reducing the difficulty of cell forming and improving the cell production efficiency. During the core assembly installation process, the electrode plate and electrode tab are inserted into the through hole of the electrode post from the inside to the outside. The installation direction of the electrode plate and electrode tab is the same, the length of the electrode tab can be greatly shortened, the current transmission path of the electrode tab is greatly reduced, the connection impedance of the cell is significantly reduced, and the fast charging performance of the battery is improved.

[0012] This embodiment also provides a method for assembling a battery cell, which includes the following steps:

[0013] Step S100: Conductive connection operation is performed on the electrode plate and electrode tab, and the assembly is formed into a winding core assembly;

[0014] Step S200: The core assembly is installed inside the housing, such that at least a portion of the tabs pass through the receiving space into the through hole, and at least a portion of the electrode plates pass through the receiving space into the through hole, with the electrode plates and the electrode posts being positioned and engaged.

[0015] Step S300: Perform a conductive connection operation on the electrode plate and the electrode post.

[0016] The battery cell assembly method of this embodiment is used to assemble the aforementioned battery cell, and therefore has the same technical effect as the aforementioned battery cell, so it will not be described again here.

[0017] This embodiment also provides a battery pack, including the aforementioned battery cells.

[0018] The battery pack of this embodiment includes the aforementioned battery cell, and therefore has the same technical effects as the aforementioned battery cell, which will not be repeated here.

[0019] This embodiment also provides a vehicle including the aforementioned battery pack.

[0020] The vehicle in this embodiment includes the aforementioned battery pack, and therefore has the same technical effects as the aforementioned battery pack, which will not be repeated here. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the first specific embodiment of the battery cell provided in this application;

[0022] Figure 2 for Figure 1 A breakdown diagram of the battery cell;

[0023] Figure 3 for Figure 1 Cross-sectional view of the battery cell along the AA direction;

[0024] Figure 4 for Figure 3 A magnified view of a portion of region A in the battery cell;

[0025] Figure 5 This is a partial cross-sectional view of the second specific embodiment of the battery cell provided in this application;

[0026] Figure 6 for Figure 1 A schematic diagram of the core assembly in a battery cell;

[0027] Figure 7 for Figure 6 A partially enlarged view of the cross-sectional view of the battery cell along the BB direction;

[0028] Figure 8 for Figure 6 Split diagram of the core assembly;

[0029] Figure 9 for Figure 6 A schematic diagram of the first angle of the electrode plate support in the core assembly;

[0030] Figure 10 for Figure 6 A schematic diagram of the second angle of the electrode plate support in the core assembly;

[0031] Figure 11 This is a partially enlarged cross-sectional view of the third specific embodiment of the battery cell provided in this application;

[0032] Figure 12 This is a partial cross-sectional view of the fourth specific embodiment of the battery cell provided in this application;

[0033] Figure 13 for Figure 6 A schematic diagram of the core assembly excluding the insulating film;

[0034] Figure 14 for Figure 6A magnified view of a portion of the core in the core assembly;

[0035] Figure 15 for Figure 6 A schematic diagram of the first angle of the core support in the core assembly;

[0036] Figure 16 for Figure 6 A schematic diagram of the second angle of the core support in the core assembly;

[0037] Figure 17 for Figure 1 A schematic diagram of the casing structure in a battery cell;

[0038] Figure 18 for Figure 17 A cross-sectional view of the housing along the CC direction;

[0039] Figure 19 for Figure 18 A magnified view of a portion of region C within the shell;

[0040] Figure 20 for Figure 4 A magnified view of a portion of the image;

[0041] Figure 21 This is a partially enlarged cross-sectional view of the casing in the fifth specific embodiment of the battery cell provided in this application;

[0042] Figure 22 for Figure 12 A partial structural diagram of the middle shell;

[0043] Figure 23 This is a partially enlarged cross-sectional view of the casing in the sixth specific embodiment of the battery cell provided in this application;

[0044] Figure 24 A cross-sectional view of the positive electrode plate in some embodiments of the battery cell provided in this application;

[0045] Figure 25 A cross-sectional view of the negative electrode plate in some embodiments of the battery cell provided in this application;

[0046] Figure 26 A partially enlarged cross-sectional view of the casing in the seventh specific embodiment of the battery cell provided in this application;

[0047] Figure 27 for Figure 3 A magnified view of a portion of region B in the middle;

[0048] Figure 28 This is a schematic diagram of the mating structure of the core support and the housing in the eighth specific embodiment of the battery cell provided in this application;

[0049] Figure 29 for Figure 3A magnified view of a portion of region C in the middle;

[0050] Figure 30 The figure shows a breakdown diagram of the ninth specific embodiment of the battery cell provided in this application;

[0051] Figure 31 for Figure 5 One of the states of the insulating film during the wrapping process in the core assembly;

[0052] Figure 32 This is a partially enlarged cross-sectional view of the casing in the tenth specific embodiment of the battery cell provided in this application;

[0053] Figure 33 A partially enlarged cross-sectional view of the casing in the eleventh specific embodiment of the battery cell provided in this application;

[0054] Figure 34 for Figure 1 A schematic diagram of a battery cell with a terminal post at one end;

[0055] Figure 35 This is a schematic diagram of the structure of the battery cell provided in the twelfth specific embodiment of the present application, showing the end of the electrode post provided.

[0056] Figure 36 This is a schematic diagram of the structure of the battery cell provided in the thirteenth specific embodiment of the present application, showing the terminal post at one end.

[0057] Figure 37 This is a schematic diagram of the structure of the battery cell provided in the fourteenth specific embodiment of the present application, showing the terminal post at one end.

[0058] Figure 38 This is a schematic diagram of the structure of the battery cell provided in the fifteenth specific embodiment of this application, showing the end with the electrode post.

[0059] Figure 39 A schematic diagram of the sixteenth specific embodiment of the battery cell provided in this application;

[0060] in, Figures 1-39 The accompanying figure labels are as follows:

[0061] 11-Shell; 111-Shell body; 111A-Bottom wall; 1A-Connecting wall; 112-Cover plate;

[0062] 12-Pole post; 12A-Positive pole post; 12B-Negative pole post; 12a-Through hole; 12a1-First connecting section; 12a2-Second connecting section; 12a3-Third connecting section; 12a4-Fourth connecting section; 12a5-Fifth connecting section; 12a6-Sixth connecting section; 12a7-Seventh connecting section; 12a8-Eighth connecting section; 12a9-Ninth connecting section; 12a0-Tenth connecting section; 12b-Positioning part; 12c-First step part;

[0063] 13-First protrusion; 14-Second protrusion; 15-Sealing ring; 16-Supporting plastic; 17-Injection molded part; 18-Explosion-proof valve;

[0064] 2-Core assembly;

[0065] 21-Core; 211-Electrode; 2111-Bending section;

[0066] 22-Electrode plate; 22A-Positive electrode plate; 22B-Negative electrode plate; 22B1-First metal layer; 22B2-Second metal layer; 22a-Positioning mating part; 221-First electrode plate part; 222-Second electrode plate part; 22-1-First connecting part; 22-2-Second connecting part; 22-3-Third connecting part;

[0067] 23-Electrode plate support; 23a-Protruding structure; 231-Rib; 2311-First rib; 2312-Second rib; 233-Positioning post;

[0068] 24-Core support; 241-Electrode tab baffle; 242-Core support body; 24a-Allowing hole; 24b-Positioning hole; 24c-Allowing notch; 2421-Protrusion; 243-Elastic fit part; 2431-Bending part;

[0069] 25-Insulating film; 25a-Through hole; 25b-Vent hole; 251-First wrapping part; 252-Second wrapping part; 253-Third wrapping part; 254-Fourth wrapping part;

[0070] A - Welding space. Detailed Implementation

[0071] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0072] In this article, the direction closer to the inside of the battery cell is called "inner", and the direction closer to the outside of the battery cell is called "outer".

[0073] Please refer to Figures 1-4 , Figure 1 This is a schematic diagram of the structure of the first specific embodiment of the battery cell provided in this application; Figure 2 for Figure 1 A breakdown diagram of the battery cell; Figure 3 for Figure 1 Cross-sectional view of the battery cell along the AA direction; Figure 4 for Figure 1 A magnified view of a portion of region A in the middle.

[0074] This embodiment provides a battery cell, including:

[0075] The housing 11 has an internal accommodating space;

[0076] The pole post 12 is disposed on the housing 11. The pole post 12 has a through hole 12a. The hole axis of the through hole 12a is arranged along the height direction of the pole post 12. The through hole 12a connects to the receiving space.

[0077] The electrode 22, at least a portion of which passes through the receiving space into the through hole 12a, and is electrically connected to the electrode post 12;

[0078] The core 21 is disposed within the receiving space, and at least a portion of the tabs 211 of the core 21 passes through the receiving space into the through hole 12a and is electrically connected to the electrode plate 22.

[0079] In this embodiment of the battery cell, the electrode post 12 is provided with a through hole 12a extending along the height direction. The through hole 12a is used to at least partially accommodate the tab 211 and at least partially accommodate the electrode plate 22. During the battery cell forming process, before the core 21 is installed inside the housing 11, the electrode plate 22 and the tab 211 can be electrically connected. For example, in this embodiment, the electrode plate 22 and the tab 211 are fixed by welding and assembled to form the core assembly 2. Then, the core assembly 2 is installed inside the housing 11, with the electrode plate 22 and the tab 211 facing the through hole 12a of the electrode post 12. The electrode plate 22 and the tab 211 pass through the through hole 12a from the accommodating space until the electrode plate 22 and the electrode post 12 are positioned and matched. Finally, the electrode plate 22 and the electrode post 12 are electrically connected. For example, in this embodiment, the electrode plate 22 and the electrode post 12 are fixed by welding.

[0080] Therefore, the structural form of the electrode plate 22 and the electrode post 12 in this embodiment determines that the electrode plate 22 and the electrode tab 211 can be welded before the core assembly 2 is installed in the shell, which facilitates the fixing of the electrode tab 211, allows for better alignment of the electrode plate 22 and the electrode tab 211, and makes the welding operation of the electrode plate 22 and the electrode tab 211 convenient, reducing the difficulty of cell forming and improving the production efficiency of the cell. During the process of installing the core assembly 2 in the shell, the electrode plate 22 and the electrode tab 211 are simultaneously inserted into the through hole 12a of the electrode post 12 through the receiving space. The installation direction of the electrode plate 22 and the electrode tab 211 is the same, the length of the electrode tab 211 can be greatly shortened, the transmission path of the electrode tab current is greatly reduced, the connection impedance of the cell is significantly reduced, and the fast charging performance of the battery is improved.

[0081] In practice, the core 21 is provided with a positive electrode tab and a negative electrode tab, the housing 11 includes a positive electrode post 12A and a negative electrode post 12B, the electrode plate 22 includes a positive electrode plate 22A and a negative electrode plate 22B, the positive electrode tab is connected to the positive electrode post 12A through the positive electrode plate 22A, and the negative electrode tab is connected to the negative electrode post 12B through the negative electrode plate 22B. The connection structure of each component in the positive and negative electrodes is the same, only the materials are slightly different. Therefore, the positive and negative electrodes are not distinguished here.

[0082] Furthermore, in practice, the material of the tab 211 is usually relatively soft. In order for the electrode plate 22 to be stably maintained in the preset installation position after being connected to the tab 211, such as... Figures 3-4 As shown, in this embodiment, the core assembly 2 further includes an electrode plate support 23, which is located between the end face of the core 21 near the pole post 12 and the electrode plate 22 to support the electrode plate 22.

[0083] Thus, in this embodiment, the electrode plate 22 is supported by the electrode plate bracket 23, so that the electrode plate 22 can be kept relatively fixed with the core 21, ensuring that the electrode plate 22 can be stably in the preset installation position, improving the positional accuracy of the electrode plate 22, and facilitating the conductive connection operation between the electrode plate 22 and the pole post 12.

[0084] Please continue to refer to the following: Figures 4-5 , Figure 4 for Figure 3 A magnified view of a portion of region A in the battery cell; Figure 5 This is a partial cross-sectional view of a second specific embodiment of the battery cell provided in this application.

[0085] In this embodiment, the tab 211 has a bent portion 2111, and the electrode plate 22 is connected to the bent portion 2111.

[0086] like Figure 4 As shown, in this embodiment, the bent portion 2111 is attached between the electrode plate support 23 and the electrode plate 22. Thus, the electrode plate support 23 can indirectly support the electrode plate 22 by supporting the bent portion 2111.

[0087] As can be seen, in this embodiment, the electrode plate 22 is connected to the surface of the bent portion 2111 facing away from the core 21. The outer surface area of ​​the electrode plate 22 is relatively large. Therefore, the outer surface of the electrode plate 22 can form a connection surface for external conductive connection, used to connect with the external aluminum sheet. In order to ensure the reliable connection between the electrode plate 22 and the external aluminum sheet, the outer surface of the electrode plate 22 can protrude from the outer surface of the pole post 12, so that the outer surface of the electrode plate 22 is far away from the connection point between the electrode plate 22 and the pole post 12, ensuring that the weld line height after welding is not higher than the outer surface of the electrode plate 22, ensuring the flatness of the outer surface of the electrode plate 22, and thus ensuring the reliable connection between the electrode plate 22 and the external aluminum sheet.

[0088] like Figure 5 As shown, in this embodiment, the bent portion 2111 is attached to the surface of the electrode plate 22 facing away from the electrode plate support 23. In this way, the wall portion of the electrode plate 22 facing the core 21 can be directly supported by the electrode plate support 23.

[0089] Specifically, the electrode plate 22 includes a first electrode plate portion 221, which is located on the side of the tab 211 facing the core 21. The first electrode plate portion 221 and the surface of the tab 211 facing the core 21 are connected as one unit. The electrode plate 22 also includes a second electrode plate portion 222, which is connected to the first electrode plate portion 221 and extends in a direction away from the core 21. The second electrode plate portion 222 is connected to the pole post 12.

[0090] Thus, in this embodiment, the first electrode plate 221 serves as a conductive connection with the tab 211, and the second electrode plate 222 serves as a conductive connection with the post 12, thereby achieving a conductive connection between the tab 211 and the post 12.

[0091] Depend on Figure 5 As can be seen, in this embodiment, a portion of the electrode plate 22 is located on the side of the tab 211 facing the core 21, and the second electrode plate portion 222 extends to the side of the tab 211 away from the core 21. The outer surface area of ​​the second electrode plate portion 222 is small. At this time, in order to improve the current carrying capacity of the battery cell, the outer surface of the electrode post 12 forms a connection surface for external conductive connection, which is used to connect with the external aluminum sheet.

[0092] To ensure a reliable connection between the electrode post 12 and the outer aluminum sheet, the outer surface of the electrode plate 22 is recessed into the outer surface of the electrode post 12. In this way, the weld line after welding is located inside the recessed structure, ensuring that the height of the weld line after welding is not higher than the outer surface of the electrode post 12, ensuring the flatness of the outer surface of the electrode post 12, and thus ensuring a reliable connection between the electrode post 12 and the outer aluminum sheet.

[0093] Please continue to refer to this. Figures 4-10 , Figure 6 for Figure 1 A schematic diagram of the core assembly in a battery cell; Figure 7 for Figure 6 A partially enlarged view of the cross-sectional view of the battery cell along the BB direction; Figure 8 for Figure 6 Split diagram of the core assembly; Figure 9 for Figure 6 A schematic diagram of the first angle of the electrode plate support in the core assembly; Figure 10 for Figure 6 A schematic diagram of the second angle of the electrode plate support in the core assembly.

[0094] In this embodiment, at least a portion of the electrode plate support 23 is inserted through the through hole 12a via the receiving space.

[0095] In some embodiments, the electrode holder 23 has a protruding structure 23a that protrudes away from the core 21. The protruding structure 23a extends along the length of the core 21, and the electrode 22 is supported on the protruding structure 23a. At least a portion of the protruding structure 23a passes through the receiving space into the through hole 12a. In this way, the protruding structure 23a serves to support the electrode 22, ensuring the positional accuracy of the electrode 22.

[0096] In some other embodiments, the pole post 12 has a mounting groove on the surface facing the core 21. The mounting groove extends along the length of the core 21 and penetrates the surface of the pole post 12 facing the core 21. The pole plate bracket 23 is partially embedded in the mounting groove.

[0097] Thus, in this embodiment, the electrode support 23 no longer has a protruding structure 23a. The surface of the electrode support 23 facing the electrode post 12 is flat, and the surface of the electrode support 23 facing the electrode post 12 provides support for the electrode 22. The inner wall of the housing 11 can be provided with a corresponding notch. Except for the part of the electrode support 23 that is embedded in the mounting groove, the other part is located inside the notch. In this way, the electrode support 23 does not need to occupy a separate height space, thereby improving the utilization rate of the height space of the battery cell.

[0098] Please combine Figure 7 It is understood that when the tabs 211 are formed, the tabs with the same polarity will move towards the same place from both ends in the width direction. In this way, along the direction close to the tabs 211, the number of tabs stacked together gradually increases, so that the end face of the core 21 close to the pole post 12 has a certain slope.

[0099] Therefore, in order to ensure that the electrode plate support 23 can be stably supported on the core 21, such as Figure 7 and Figure 10 As shown, in this embodiment, the surface of the electrode support 23 facing the core 21 is provided with a rib 231, the rib 231 abuts against the end face of the core 21 near the pole post 12, and the surface of the electrode support 23 facing away from the core 21 supports the electrode 22.

[0100] Thus, the rib 231 forms a support surface facing the core 21. The shape of the support surface can be designed to mimic the shape of the end face of the core 21 near the pole post 12, ensuring that the pole plate bracket 23 can be stably supported on the core 21 and that the position of the pole plate 22 is controllable.

[0101] In embodiments where the electrode support 23 does not have a protruding structure 23a, the electrode support 23 is provided with ribs 231 along its length. The surface of the electrode support 23 facing the core 21 is supported by the core 21 through the ribs 231, thereby increasing the support area of ​​the electrode support 23 and improving the support stability of the electrode support 23.

[0102] In embodiments where the electrode support 23 has a protruding structure 23a, such as Figure 9 and Figure 10 As shown, a recessed portion can be formed inside the protruding structure 23a, and the protruding rib 231 is set inside the recessed portion. The other areas of the electrode support 23, except for the protruding structure 23a, can be directly supported on the end face of the core 21 near the electrode post 12, reducing the space occupied by the electrode support 23 in the height direction and improving the height space utilization rate of the cell. At the same time, the protruding rib 231 set inside the recessed portion can also improve the structural strength of the protruding structure 23a, ensure the structural stability of the protruding structure 23a, and ensure the support stability of the electrode support 23 on the electrode 22.

[0103] Please continue to refer to the following: Figure 7 and Figure 10 As shown, in this embodiment, the rib 231 includes:

[0104] The first rib 2311 extends along the length of the core 21 and abuts at the root of the tab 211.

[0105] The second rib 2312 extends along the width direction of the core 21, and the surface of the second rib 2312 facing the core 21 is designed according to the root shape of the tab 211.

[0106] Thus, both the first rib 2311 and the second rib 2312 can maintain contact with the end face of the core 21 near the pole post 12, improving the support stability of the pole plate bracket 23. At the same time, in this embodiment, there are multiple second ribs 2312, which are distributed at intervals along the length direction of the core 21. The first rib 2311 connects the multiple second ribs 2312 into one, which can also improve the structural strength of the rib 231 and ensure that the pole plate bracket 23 stably plays a supporting role for the pole plate 22.

[0107] Of course, provided that the support stability of the electrode plate support 23 is guaranteed, it is also feasible for the rib 231 to include either the first rib 2311 or the second rib 2312. At the same time, there is no limit to the number of the first rib 2311 and the second rib 2312. Provided that the support stability of the electrode plate support 23 is guaranteed, the number of the first rib 2311 can be at least one, and the number of the second rib 2312 can be at least one.

[0108] Please continue to refer to this. Figure 7 and Figure 11 , Figure 11 This is a partially enlarged cross-sectional view of the third specific embodiment of the battery cell provided in this application.

[0109] exist Figure 7In the illustrated embodiment, there are two cores 21 arranged side-by-side, with their tabs 211 mirror-shaped. An electrode support 23 is positioned between the two tabs 211, and a second rib 2311 is centrally located, specifically at the midpoint of the width of the electrode support 23. This design allows the second rib 2311 to be supported at the contact point of the two cores 21, making it easier for the electrode support 23 to maintain balance and improving its stability.

[0110] It is understandable that the number of cores 21 can be more than two. In practice, the number of cores 21 is usually an even number. The number of cores 21 is defined as 2n, where n=1,2,3…. At this time, each core 21 is still connected to form two tabs 211, and the two tabs 211 are arranged in a mirror image.

[0111] exist Figure 11 In the illustrated embodiment, there is one core 21. The tab 211 is bent to one side of the width direction of the core 21. It can be seen that on the bent side near the tab 211, the end face of the core 21 facing the pole post 12 gradually tilts upward along the direction near the tab 211. The pole plate support 23 is set on the bent side of the tab 211. With the center line of the width direction of the pole plate support 23 as the boundary, the first rib 2311 is located on the side away from the tab 211, making it easier for the pole plate support 23 to maintain balance. The height of the second rib 2312 gradually decreases along the direction near the tab 211, so that the supporting surface of the second rib 2312 facing the core 21 can reliably fit with the opposite end face of the core 21, improving the support stability of the pole plate support 23.

[0112] Please continue to refer to this. Figure 11 and Figure 12 ,exist Figure 11 In the illustrated embodiment, the bent portion 2111 extends along the width direction of the core 21, that is, the connecting surface between the tab 211 and the electrode plate 22 is parallel to the cross-section of the core 21; Figure 12 In the embodiment shown, there is an angle between the bent portion 2111 and the width direction of the core 21, that is, there is an angle between the connecting surface of the tab 211 and the electrode plate 22 and the cross-section of the core 21.

[0113] As set above, when there is an angle between the bending part 2111 and the width direction of the core 21, the laser beam during welding can be incident at an angle, resulting in better welding effect and improved welding reliability of the tab 211 and the electrode plate 22, making it a more preferred technical solution.

[0114] In order to ensure that the electrode plate support 23 can stably play its supporting role, at least one of the electrode tab 211 and electrode plate 22 can be bonded or snapped to the electrode plate support 23 to ensure the relative fixed state of the electrode plate support 23, electrode tab 211 and electrode plate 22, and to ensure the positional constraint of the electrode plate support 23 on the electrode plate 22.

[0115] In practice, during the forming process of the core assembly 2, before the tab 211 is bent, the tab 211 is in a straight extension state. At this time, the electrode plate 22 and the tab 211 are welded together. Then, at least one of the tab 211 and the electrode plate 22 is fixed to the electrode plate support 23 to ensure that the three are in a relatively fixed state. Finally, the tab 211 is bent to obtain the bending state as shown above. The core 21 is bent towards the side closer to the electrode plate support 23, so that the electrode plate support 23 is supported by the core 21.

[0116] In practice, the electrode plate support 23 can be made of insulating materials, such as plastic.

[0117] Depend on Figure 8 As can be seen, in this embodiment, there are two electrode plate supports 23, which are used to support the positive electrode plate 22A and the negative electrode plate 22B respectively. In practice, it is also feasible to have only one electrode plate support 23, with the same electrode plate support 23 supporting both the positive electrode plate 22A and the negative electrode plate 22B.

[0118] Please continue to refer to this. Figure 8 , Figures 11-16 , Figure 13 for Figure 5 A schematic diagram of the core assembly excluding the insulating film; Figure 14 for Figure 6 A magnified view of a portion of the core in the core assembly; Figure 15 for Figure 6 A schematic diagram of the first angle of the core support in the core assembly; Figure 16 for Figure 5 A schematic diagram of the second angle of the core support in the core assembly.

[0119] In this embodiment, the core assembly 2 further includes:

[0120] The core support 24 includes a tab baffle 241, the free end of which abuts against the root of the tab 211 on the surface facing the pole post 12.

[0121] It is understandable that during the bending process of tab 211, the side of tab 211 facing away from the bending part 2111 will inevitably arch upwards, creating a greater slope. Figure 14The dotted line shows the tilted state of the root of the tab 211 after bending, on the side facing away from the bending part 2111. It can be seen that the root of the tab 211 on the side facing away from the bending part 2111 occupies a certain height space, resulting in a loss of cell height space utilization.

[0122] In this embodiment, a core support 24 is added, such as Figure 11 and Figure 12 As shown, the core support 24 is provided with a tab baffle 241. The free end of the tab baffle 241 abuts against the surface of the root of the tab 211 facing the pole post 12. In this way, the tab baffle 241 will exert a certain downward pressure on the upward arched part of the root of the tab 211, making the side of the root of the tab 211 away from the bending part 2111 more compact in the height direction, reducing the height space occupied by the root of the tab 211 and improving the utilization rate of the cell height space.

[0123] Please continue to refer to this. Figure 15 and Figure 16 In this embodiment, the core support 24 also includes a core support body 242. The core support body 242 is provided with a clearance hole 24a. There are two electrode tab baffles 241. The electrode tab baffles 241 are disposed inside the clearance hole 24a and distributed along the width direction of the clearance hole 24a. The electrode tab 211 and the electrode plate 22 can pass through the clearance hole 24a and the position between the two electrode tab baffles 241. The inner end of the electrode post 12 is inserted into the clearance hole 24a.

[0124] Combination Figure 11 and Figure 12 As can be seen, without the aforementioned tab baffle 241, the upward arching of the root of the tab 211 facing away from the bending portion 2111 would interfere with the pole post 12, affecting the positioning and installation of the pole plate 22 and the pole post 12. In this embodiment, the tab baffle 241 is added to constrain the shape of the root of the tab 211 facing away from the bending portion 2111, ensuring that when the core assembly 2 is inserted into the shell, the pole plate 22 and the tab 211 can smoothly enter the inner cavity of the pole post 12, ensuring reliable positioning of the pole plate 22 and the pole post 12.

[0125] Combination Figure 12 and Figure 15 In this embodiment, there are two cores 21 and two tabs 211. The two tabs 211 are mirror images of each other. Therefore, in this embodiment, two tab baffles 241 are connected inside the clearance hole 24a. The two tab baffles 241 are arranged along the width direction of the clearance hole 24a. Each tab baffle 241 presses the root of the corresponding tab 211 on the side facing away from the bending portion 2111, thereby constraining the shape of the root of the tab 211.

[0126] In practice, when there is only one core 21 and one tab 211, only one tab baffle 241 can be installed inside the clearance hole 24a.

[0127] Furthermore, the core support 24 is installed at the end of the core 21 facing the pole post 12. Specifically, in this embodiment, as follows: Figure 9 As shown, the electrode plate bracket 23 is provided with positioning posts 233, such as Figure 15 As shown, the core support 24 is provided with a positioning hole 24b, and the positioning post 233 is inserted into the positioning hole 24b to realize the positioning of the core support 24 and ensure the assembly accuracy of the core support 24.

[0128] Depend on Figure 9 As can be seen, in this embodiment, the aforementioned positioning posts 233 are provided at both ends of the electrode plate support 23 along its length. Figure 15 It can be seen that the core support 24 is provided with positioning holes 24b at both ends of the clearance hole 24a. The core support 24 and the electrode plate support 23 are positioned by the insertion and cooperation of four sets of positioning pins 233 and positioning holes 24b.

[0129] In practice, the core support 24 and the electrode plate support 23 can be positioned by the insertion and engagement of at least two sets of positioning pins 233 and positioning holes 24b.

[0130] Of course, in practice, it is also feasible to have positioning holes 24b on the electrode plate bracket 23 and corresponding positioning posts 233 on the core bracket 24. In addition, in practice, the core bracket 24 and the electrode plate bracket 23 are not limited to the insertion fit of the positioning posts 233 and positioning holes 24b as described above; positioning can also be achieved by snap-fitting.

[0131] Please refer to Figure 4 , Figures 17-20 , Figure 17 for Figure 1 A schematic diagram of the casing structure in a battery cell; Figure 18 for Figure 17 A cross-sectional view of the housing along the CC direction; Figure 19 for Figure 22 A magnified view of a portion of region C within the shell; Figure 20 for Figure 4 A magnified view of a portion of the image.

[0132] As mentioned above, the electrode plate 22 and the electrode post 12 are positioned and fitted together. Specifically, in this embodiment, the inner wall of the through hole 12a has a positioning part 12b, the width of which gradually decreases from the inside to the outside. The peripheral wall of the electrode plate 22 has a matching positioning and fitting part 22a, the width of which gradually decreases from the inside to the outside. The positioning part 12b and the positioning and fitting part 22a abut against each other.

[0133] Thus, the positioning part 12b can limit the position of the electrode plate 22. When the positioning part 12b and the positioning mating part 22a are in contact, the electrode plate 22 cannot continue to move outward, ensuring that the electrode plate 22 and the electrode post 12 can be stably in the preset assembly position.

[0134] Furthermore, such as Figures 19-20 As shown, the through hole 12a includes a first connecting segment 12a1, a second connecting segment 12a2, and a third connecting segment 12a3 connected sequentially from the inside to the outside. The width of the second connecting segment 12a2 gradually decreases from the inside to the outside. The width of the first connecting segment 12a1 is greater than the inner end width of the second connecting segment 12a2. The inner wall of the second connecting segment 12a2 forms a positioning part 12b. The inner wall of the third connecting segment 12a3 and the relative peripheral wall of the electrode plate 22 form a welding space A.

[0135] Thus, in this embodiment, the first connecting segment 12a1 is used to accommodate the tab 211 and part of the electrode 22, the second connecting segment 12a2 is used to guide and limit the electrode 22, ensuring that the electrode 22 and the electrode post 12 can be stably positioned in the preset assembly position, and a welding space A is formed between the inner wall of the third connecting segment 12a3 and the relative peripheral wall of the electrode post 12, realizing the conductive connection between the electrode 22 and the electrode post 12. In this embodiment, the outer surface of the electrode 22 protrudes from the outer surface of the electrode post 12 for connecting to external circuits, ensuring the flatness of the outer surface of the electrode 22.

[0136] Please refer to Figure 21 , Figure 21 This is a partially enlarged cross-sectional view of the casing in the fifth specific embodiment of the battery cell provided in this application;

[0137] In some other embodiments of this application, the through hole 12a includes a fourth connecting segment 12a4 and a fifth connecting segment 12a5 connected sequentially from the inside to the outside. The width of the fourth connecting segment 12a4 gradually decreases from the inside to the outside. The inner wall of the fourth connecting segment 12a4 forms a positioning part 12b. A welding space is formed between the inner wall of the fifth connecting segment 12a5 and the relative peripheral wall of the electrode plate 22.

[0138] Thus, in this embodiment, the fourth connecting segment 12a4 serves both to accommodate the tab 211 and part of the electrode 22, and to guide and limit the electrode 22, ensuring that the electrode 22 and the pole post 12 can be stably positioned in the preset assembly position. A welding space is formed between the inner wall of the fifth connecting segment 12a5 and the relative peripheral wall of the pole post 12, achieving a conductive connection between the electrode 22 and the pole post 12. It can be seen that in this embodiment, the pole post 12 has a thicker wall, which improves its structural stability. In this embodiment, the outer surface of the electrode 22 protrudes from the outer surface of the pole post 12, used to connect to external circuits, ensuring the flatness of the outer surface of the electrode 22.

[0139] Please continue to refer to this. Figure 11 , Figure 12 and Figure 22 , Figure 22 for Figure 11 and Figure 12 A partial structural diagram of the middle shell.

[0140] In this embodiment, the through hole 12a includes a first connecting segment 12a1, a second connecting segment 12a2, and a third connecting segment 12a3 connected sequentially from the inside to the outside. The width of the second connecting segment 12a2 gradually decreases from the inside to the outside. The width of the first connecting segment 12a1 is greater than the inner end width of the second connecting segment 12a2. The inner wall of the second connecting segment 12a2 forms a positioning part 12b. A welding space is formed between the inner wall of the third connecting segment 12a3 and the relative peripheral wall of the electrode plate 22.

[0141] The through hole 12a also includes a sixth connecting segment 11a6, which is connected to the outer end of the third connecting segment 12a3. The width of the sixth connecting segment 11a6 is greater than the width of the third connecting segment 12a3.

[0142] Thus, in this embodiment, the first connecting segment 12a1 is used to accommodate the tab 211 and part of the electrode 22, the second connecting segment 12a2 is used to guide and limit the electrode 22, ensuring that the electrode 22 and the electrode post 12 can be stably positioned in the preset assembly position, and a welding space is formed between the inner wall of the third connecting segment 12a3 and the relative peripheral wall of the electrode post 12, realizing the conductive connection between the electrode 22 and the electrode post 12. In this embodiment, the outer surface of the electrode 22 is recessed into the outer surface of the electrode post 12, and the outer surface of the electrode post 12 is used to connect to the external circuit. In order to ensure the flatness of the outer surface of the electrode post 12, this embodiment adds a sixth connecting segment 11a6 at the outer end of the third connecting segment 12a3. The welded wire is located inside the sixth connecting segment 11a6, ensuring that the height of the welded wire is not higher than the outer surface of the electrode post 12, thereby ensuring the flatness of the electrode post 12.

[0143] Please refer to Figure 23 , Figure 23 This is a partially enlarged cross-sectional view of the casing in the sixth specific embodiment of the battery cell provided in this application.

[0144] In this embodiment, the through hole 12a includes a fourth connecting segment 12a4 and a fifth connecting segment 12a5 connected sequentially from the inside to the outside. The width of the fourth connecting segment 12a4 gradually decreases from the inside to the outside. The inner wall of the fourth connecting segment 12a4 forms a positioning part 12b. A welding space is formed between the inner wall of the fifth connecting segment 12a5 and the relative peripheral wall of the electrode plate 22.

[0145] The through hole 12a also includes a seventh connecting segment 11a7, which is connected to the outer end of the fifth connecting segment 12a5. The width of the seventh connecting segment 11a7 gradually expands from the inside to the outside, and the width of the inner end of the seventh connecting segment 11a7 is greater than the width of the fifth connecting segment 12a5.

[0146] As can be seen, in this embodiment, the outer end of the pole post 12 has a stamped second protrusion 14. Therefore, a seventh connecting section 11a7 is provided inside the through hole 12a at the outer end of the fifth connecting section 12a5, which facilitates the forming of the first protrusion 13. In this embodiment, the outer surface of the electrode plate 22 protrudes from the outer surface of the pole post 12 for connecting to external circuits, ensuring the flatness of the outer surface of the electrode plate 22.

[0147] Please refer to Figures 24-25 , Figure 24 A cross-sectional view of the positive electrode plate in some embodiments of the battery cell provided in this application; Figure 25 This is a cross-sectional view of the negative electrode plate in some embodiments of the battery cell provided in this application.

[0148] In some embodiments of this application, the electrode plate 22 includes a first connecting portion 22-1 and a second connecting portion 22-2 connected sequentially from the inside to the outside. The width of the first connecting portion 22-1 gradually decreases from the inside to the outside. The width of the second connecting portion 22-2 is smaller than the outer end width of the first connecting portion 22-1. The peripheral wall of the first connecting portion 22-1 forms the aforementioned positioning and fitting portion 22a. A welding space is formed between the peripheral wall of the second connecting portion 22-2 and the relative inner wall of the through hole 12a.

[0149] Thus, the first connecting part 22-1 is used for positioning and fitting the pole post 12 to ensure that the pole plate 22 and the pole post 12 can be stably in the preset assembly position; a welding space is formed between the peripheral wall of the second connecting part 22-2 and the relative inner wall of the through hole 12a to realize the conductive connection between the pole plate 22 and the pole post 12.

[0150] Furthermore, the electrode plate 22 also includes a third connecting portion 22-3, which is connected to the outer end of the second connecting portion 22-2. The width of the third connecting portion 22-3 is smaller than the width of the second connecting portion 22-2. The outer surface of the third connecting portion 22-3 protrudes from the outer surface of the electrode post 12, and the outer surface of the third connecting portion 22-3 forms a connecting surface for external conductive connection.

[0151] By setting the third connecting part 22-3 as described above, the outer surface of the electrode plate 22 protrudes from the welding position of the electrode plate 22 and the electrode post 12, ensuring that the weld line height is not higher than the outer surface of the electrode post 12 after welding, thereby ensuring the flatness of the electrode post 12.

[0152] In this embodiment, the positive electrode post 12A is made of aluminum alloy, therefore, the positive electrode plate 22A is also made of aluminum alloy; however, the material of the negative electrode plate 22B may vary depending on the design requirements of different battery cell products. When used in lithium-ion batteries, the negative electrode plate 22B needs to be made of composite materials, such as... Figure 25 As shown, the negative electrode plate 22B includes a first metal layer 22B1 and a second metal layer 22B2. The first metal layer 22B1 is made of aluminum and is used to connect with the external circuit. The second metal layer 22B2 is made of copper and is used to connect with the negative electrode post 12B. When used in sodium-ion batteries or other battery products, the negative electrode plate 22B can use the same metal material as the positive electrode plate 22A.

[0153] Please refer to Figure 26 , Figure 26 This is a partially enlarged cross-sectional view of the casing in the seventh specific embodiment of the battery cell provided in this application.

[0154] In this embodiment, the inner wall of the through hole 12a has a first step portion 12c facing the inner end, and the peripheral wall of the electrode plate 22 has a second step portion facing the outer end. The first step portion 12c and the second step portion abut against each other.

[0155] Thus, the first step portion 11c is equivalent to the aforementioned positioning portion 12b, and the second step portion is equivalent to the aforementioned positioning and mating portion 22a. The first step portion 12c serves to limit the position of the electrode plate 22. When the first step portion 12c and the second step portion come into contact, the electrode plate 22 cannot continue to move outward, ensuring that the electrode plate 22 and the electrode post 12 can be stably positioned in the preset assembly position.

[0156] Specifically, the through hole 12a includes an eighth connecting segment 12a8, a ninth connecting segment 12a9, and a tenth connecting segment 12a0 connected sequentially from the inside out. The widths of the eighth connecting segment 12a8, the ninth connecting segment 12a9, and the tenth connecting segment 12a0 gradually decrease. A stepped wall facing inward is formed between the ninth connecting segment 12a9 and the tenth connecting segment 12a0. The stepped wall forms a first stepped portion 12c. A welding space is formed between the inner wall of the tenth connecting segment 12a0 and the relative peripheral wall of the electrode plate 22.

[0157] Thus, in this embodiment, the eighth connecting segment 12a8 is used to accommodate the tab 211 and part of the electrode plate 22, the ninth connecting segment 12a9 accommodates part of the electrode plate 22 and limits the electrode plate 22 to ensure that the electrode plate 22 and the electrode post 12 can be stably positioned in the preset assembly position, and a welding space is formed between the inner wall of the tenth connecting segment 12a0 and the relative peripheral wall of the electrode plate 22 to achieve conductive connection between the electrode plate 22 and the electrode post 12. In this embodiment, the outer surface of the electrode plate 22 protrudes from the outer surface of the electrode post 12 to connect to the external circuit and ensure the flatness of the outer surface of the electrode plate 22.

[0158] Correspondingly, the electrode plate 22 includes a first connecting portion and a second connecting portion connected sequentially from the inside to the outside. The width of the first connecting portion is greater than the width of the second connecting portion. A stepped wall facing outward is formed between the first connecting portion and the second connecting portion. The stepped wall forms a second stepped portion 22b. A welding space is formed between the peripheral wall of the second connecting portion and the relative inner wall of the through hole 12a.

[0159] Thus, the first connecting part is used to cooperate with the ninth connecting section 12a9 to ensure that the electrode plate 22 and the electrode post 12 can be stably in the preset assembly position, and a welding space is formed between the peripheral wall of the second connecting part and the relative inner wall of the through hole 12a to realize the conductive connection between the electrode plate 22 and the electrode post 12.

[0160] Furthermore, in this embodiment, the electrode plate 22 also includes a third connecting portion, which is connected to the outer end of the second connecting portion. The width of the third connecting portion is smaller than the width of the second connecting portion, and the outer surface of the third connecting portion protrudes from the outer surface of the electrode post 12. The outer surface of the third connecting portion forms a connecting surface for external conductive connection.

[0161] By setting the third connection part as described above, the outer surface of the electrode plate 22 protrudes from the welding position of the electrode plate 22 and the electrode post 12, ensuring that the weld line height is not higher than the outer surface of the electrode post 12 after welding, thereby ensuring the flatness of the electrode post 12.

[0162] Please continue to refer to this. Figure 3 , Figures 27-30 , Figure 27 for Figure 3 A magnified view of a portion of region B in the middle; Figure 28 This is a schematic diagram of the mating structure of the core support and the housing in the eighth specific embodiment of the battery cell provided in this application; Figure 29 for Figure 3 A magnified view of a portion of region C in the middle; Figure 30 The figure shows a breakdown diagram of the ninth specific embodiment of the battery cell provided in this application.

[0163] In this embodiment, the housing 11 includes a housing body 111 and a cover plate 112. The interior of the housing body 111 is hollow, and one end of the housing body 111 is an open end. The cover plate 112 is connected to the open end of the housing body 111. The housing body 111 and the cover plate 112 enclose and form an accommodating space. The pole post 12 is disposed through the cover plate 112, or the pole post 12 is disposed through the bottom wall 111A of the housing body 111.

[0164] It should be noted that the end wall opposite the opening end in the shell body 111 is defined as the bottom wall 111A.

[0165] In practice, the shell body 111 is usually a one-piece molded part formed by stretching. The closed end of the shell body 111 will have a rounded corner. In other words, the bottom wall 111A of the shell body 111 is connected to the side wall with a rounded corner. However, the core 21 cannot be machined with a matching rounded corner. Therefore, when the pole post 12 is set on the cover plate 112, in order to make the core assembly 2 avoid the rounded corner at the bottom of the shell body 111, a support component needs to be added inside the shell 11. The support component is used to raise the core assembly 2 to avoid the rounded corner at the closed end of the shell body 111. The existence of the support component will lose some of the cell height space and reduce the utilization rate of the cell height space.

[0166] Based on this, in some other embodiments of this application, the pole post 12 is disposed on the bottom wall 111A of the shell body 111, and the cover plate 112 and the shell body 111 are connected at a right angle, such as... Figure 29 As shown, the core assembly 2 can be directly supported on the cover plate 112 without the need for support components to raise it, which further improves the utilization rate of the cell height space, reduces the number of parts in the cell, lowers the cost, reduces the weight of the cell, and meets the requirements for lightweighting.

[0167] In addition, since the pole post 12 is located at the end of the shell body 111 away from the cover plate 112, the amplitude at the connection between the shell body 111 and the cover plate 112 is small, and the connection between the shell body 111 and the cover plate 112 is not prone to cracking, which can improve the reliability of the battery cell, help reduce the wall thickness of the shell body 111, thereby further reducing the cost, reducing the weight of the battery cell, and realizing the miniaturization of the shell body 111.

[0168] It is understandable that the core 21 will inevitably expand due to heat as the usage time increases. Therefore, an expansion gap needs to be reserved between the core 21 and the housing 11 during the design. In the process of assembling the core assembly 2 into the housing, in order to ensure that the electrode plate 22 and the electrode tab 211 can smoothly enter the through hole 12a of the electrode post 12, the position of the core assembly 2 needs to be constrained. In this embodiment, the core bracket 24 plays the role of constraining the position of the core 21.

[0169] Depend on Figure 27 As can be seen, in this embodiment, the core support 24 and the housing 11 are fitted with a clearance.

[0170] Depend on Figure 28 As can be seen, in this embodiment, the peripheral wall of the core support 24 is provided with an elastic fitting part 243. The core support 24 and the housing 11 are elastically fitted through the elastic fitting part 243, which improves the positioning accuracy of the core assembly 2 and the housing 11 and improves the assembly yield.

[0171] Furthermore, it is understood that when the core support 24 and the housing 11 are fitted with a clearance, the machining accuracy requirements of the core support 24 and the housing 11 are relatively high. However, when the core support 24 and the housing 11 are installed through the elastic fitting part 243, the machining accuracy requirements of the core support 24 and the housing 11 can be reduced, thereby improving the production efficiency of the battery cell.

[0172] Among them, such as Figure 28 As shown, in this embodiment, the elastic mating part 243 first extends along the direction close to the inner wall of the housing 11, and then bends towards the end close to the core 21 to form a bent part 2431. The width between the wall surface of the bent part 2431 facing away from the core support 24 and the core support 24 is defined as the width of the elastic mating part 243. It can be seen that the width of the elastic mating part 243 gradually increases along the extension direction of the bent part 2431. During the assembly process of the core assembly 2, the end of the core assembly 2 that first enters the housing 11 is defined as the "front end", and the end of the core assembly 2 that enters the housing 11 later is defined as the "rear end". The width of the front end of the elastic mating part 243 can be... With the gap between the peripheral wall of the core support 24 and the inner wall of the housing 11 designed to be smaller than that between the peripheral wall of the core support 24 and the inner wall of the housing 11, the width of the tail end of the elastic mating part 243 can be designed to be no less than that between the peripheral wall of the core support 24 and the inner wall of the housing 11. In this way, during the assembly process of the core assembly 2, the core assembly 2 can smoothly enter the interior of the housing 11, ensuring the smooth assembly of the core assembly 2. As the core assembly 2 goes deeper into the interior of the housing 11, the wall surface of the bending part 2431 facing away from the core support 24 will abut against the inner wall of the housing 11 and undergo elastic deformation, improving the positioning accuracy of the core assembly 2 and the housing 11, and ensuring the smooth assembly of the electrode plate 22 and the electrode post 12.

[0173] Of course, in practice, the elastic fitting part 243 is not limited to the above-described embodiments. For example, the elastic fitting part 243 can also be a deformable wedge block. The width of the front end of the wedge block is designed to be smaller than the gap between the peripheral wall of the core support 24 and the inner wall of the housing 11, and the width of the tail end of the wedge block is designed to be not less than the gap between the peripheral wall of the core support 24 and the inner wall of the housing 11. During the core assembly 2 is installed in the housing, the wedge block can be squeezed and deformed to achieve elastic fitting between the core assembly 2 and the housing 11, thereby improving the positioning accuracy of the core assembly 2 and the housing 11.

[0174] Furthermore, in this embodiment, the peripheral wall of the core support 24 is provided with an elastic fitting portion 243. In practice, the elastic fitting portion 243 is provided on the inner wall of the housing 11, or the elastic fitting portion 243 is provided on both the inner wall of the housing 11 and the peripheral wall of the core support 244.

[0175] Please continue to refer to this. Figure 27When the core support 24 and the housing 11 are in clearance fit, the peripheral wall of the core support 24 is provided with a clearance notch 24c on the surface away from the core 21.

[0176] Thus, when the core assembly 2 is installed inside the housing 11, the clearance notch 24c is directly opposite the rounded corner of the closed end of the housing body 111, thereby avoiding the rounded corner of the closed end of the housing body 111.

[0177] Of course, in practice, the surface of the core support 24 away from the core 21 can also be set to a matching rounded corner structure, which can also avoid the rounded corner of the closed end of the shell body 111.

[0178] Depend on Figure 28 It can be seen that when the core support 24 and the housing 11 are installed together through the elastic fitting part 243, it is also feasible to connect the edge of the peripheral wall of the core support 24 away from the core 21 at a right angle.

[0179] In practice, the core support 24 is made of insulating materials, such as plastic.

[0180] Please continue to refer to this. Figure 6 In this embodiment, the two ends of the winding core support 24 protrude from the winding core 21 to form protrusions 2421, and the battery cell also includes:

[0181] The insulating film 25 covers the portion of the core 21 except for the tabs 211 and the portion of the core support 24 except for the protrusions 2421.

[0182] As described above, the insulating film 25 can provide insulation protection for the core 21 and prevent the core 21 from being scratched or damaged during the assembly process. At the same time, the part of the core support 24, except for the protrusion 2421, is also wrapped inside the insulating film 25. The insulating film 25 can also effectively fix the core support 24 and the core 21, ensuring that the connection between the two is reliable.

[0183] Please refer to Figure 31 , Figure 31 for Figure 5 One of the states of the insulating film during the wrapping process in the core assembly.

[0184] In this embodiment, the insulating film 25 is in the unfolded state as follows: Figure 31 As shown, the insulating film 25 includes a first wrapping portion 251, which is used to wrap the wall of the core support 24 facing away from the core 21. The first wrapping portion 251 is provided with a through hole 25a for the tab 211 to pass through.

[0185] The insulating film 25 also includes two second wrapping portions 252, which are connected to both sides of the first wrapping portion 251 in the width direction. The second wrapping portions 252 can be bent around the connection with the first wrapping portion 251. The second wrapping portions 252 are used to wrap the wide side of the core assembly 2.

[0186] The insulating film 25 also includes four third wrapping portions 253. Two third wrapping portions 253 are connected to both sides of the same second wrapping portion 252 along its length. The third wrapping portions 253 can be bent around the connection with the second wrapping portion 252. The two third wrapping portions 253 on the same side are used to wrap the corresponding narrow side of the core 21.

[0187] The insulating film 25 also includes two fourth wrapping portions 254, which are respectively connected to the two second wrapping portions 252 on the side away from the first wrapping portion 251. The fourth wrapping portions 254 can be bent around the connection with the second wrapping portions 252, and the two fourth wrapping portions together wrap the end wall of the core 21 facing away from the core support 24.

[0188] Thus, during the wrapping process of the insulating film 25, the first wrapping part 251 can be fixed to the wall of the core support 24 facing away from the core 21, and then the second wrapping part 252 can be bent around the connection with the first wrapping part 251 to wrap the wide side of the core assembly 2; then the third wrapping part 253 can be bent around the connection with the second wrapping part 252 to wrap the narrow side of the core 21; finally, the fourth wrapping part 254 can be bent around the connection with the second wrapping part 252 to wrap the end wall of the core 21 facing away from the core support 24.

[0189] As can be seen, the structural form of the insulating film 25 in this embodiment makes the wrapping process of the insulating film 25 simpler, and the insulating film 25 can achieve insulation coverage of the six walls of the core assembly 2, ensuring reliable insulation protection of the core assembly 2.

[0190] Depend on Figure 6 As can be seen, after the insulating film 25 is wrapped, there is a gap between the third wrapping part 253 and the first wrapping part 251, through which the protrusion 2421 can pass. Since the core support 24 is usually made of insulating material, it is also feasible for the protrusion 2421 to be exposed outside the insulating film 25, as long as the protection of the core 21 is reliable. In this embodiment, the design of the third wrapping part 253 avoiding the protrusion 2421 allows the third wrapping part 253 to reliably fit with the corresponding narrow surface of the core 21, thereby improving the reliability of the insulating film 25 in protecting the core 21.

[0191] Of course, in practice, the insulating film 25 may also include two fifth wrapping portions. The fifth wrapping portions are connected to both ends of the first wrapping portion 251 in the length direction. The fifth wrapping portions can be bent around the connection with the first wrapping portion 251. The fifth wrapping portions are used to wrap the protrusions 2421 at both ends. In this way, the core support 24 can also be completely wrapped inside the insulating film 25.

[0192] Among them, the two third wrapping parts 253 are used to wrap the same narrow side of the core 21. In the wrapped state, the two third wrapping parts 253 should be seamlessly connected or at least partially overlapped along the width direction of the narrow side of the core 21 to ensure reliable protection.

[0193] Similarly, the two fourth wrapping parts 254 together wrap the end wall of the core 21 away from the core support 24. In the wrapped state, the two fourth wrapping parts 254 should be seamlessly connected or at least partially overlap along the width direction of the end wall of the core 21 facing away from the core support 24 to ensure reliable protection.

[0194] In this embodiment, the insulating film 25 includes four third wrapping portions 253, with two third wrapping portions 253 on the same side used to jointly wrap a narrow face of the core 21. In practice, the insulating film 25 may include two third wrapping portions 253, with the two third wrapping portions 253 connected to both sides of the same second wrapping portion 252 along its length. The width of the third wrapping portion 253 is the same as the width of the narrow face of the core 21, thus one third wrapping portion 253 can wrap one narrow face of the core 21. Therefore, in practice, the insulating film 25 may include at least two third wrapping portions 253, with the third wrapping portions 253 connected to both sides of at least one of the second wrapping portions 252 along its length.

[0195] In this embodiment, the insulating film 25 includes two fourth wrapping portions 254, which together wrap the end wall of the core 21 facing away from the core support 24. In practice, the insulating film 25 may include only one fourth wrapping portion 254, connected to the side of one of the second wrapping portions 252 away from the first wrapping portion 251. The width of the fourth wrapping portion 254 is the same as the width of the end wall of the core 21 facing away from the core support 24, thus one fourth wrapping portion 254 can wrap the end wall of the core 21 facing away from the core support 24. Therefore, in practice, the insulating film 25 may include at least one fourth wrapping portion 254, connected to the side of at least one of the second wrapping portions 252 away from the first wrapping portion 251.

[0196] like Figure 6 As shown, in this embodiment, the insulating film 15 is also provided with an exhaust hole 25b. When the core 21 experiences thermal runaway, the generated hot gas can flow out along the exhaust hole 25b and be discharged to the explosion-proof valve, ensuring that the explosion-proof valve opens in time to release gas and improve the safety performance of the battery cell.

[0197] Please continue to refer to this. Figure 22 , Figure 23 , Figure 32 and Figure 33 , Figure 32 This is a partially enlarged cross-sectional view of the casing in the tenth specific embodiment of the battery cell provided in this application; Figure 33 This is a partially enlarged cross-sectional view of the casing in the eleventh specific embodiment of the battery cell provided in this application.

[0198] The wall portion of the housing 11 that connects to the pole 12 is defined as the connecting wall 1A. In this embodiment, the connecting wall 1A is provided with a pole mounting hole, and the pole 12 is inserted into the pole mounting hole. The housing 11 also includes an insulating fixing part, which seals and connects the pole 12 and the connecting wall 1A and isolates the two.

[0199] As set above, in this embodiment, the pole post 12 and the connecting wall 1A are sealed and connected by an insulating fixing part and isolated from each other, ensuring the reliability of the connection between the pole post 12 and the connecting wall 1A, while ensuring the sealing performance and insulation performance between the pole post 12 and the connecting wall 1A.

[0200] This embodiment provides multiple implementations of the insulating fixing part, specifically:

[0201] The inner end of the pole post 12 has a first protrusion 13 that protrudes outward in the width direction, and the outer end of the pole post 12 has a second protrusion 14 that protrudes outward in the width direction. The first protrusion 13 is integrally formed during the processing of the pole post 12. In other words, the first protrusion 13 and the pole post 12 are an integral structure.

[0202] The first implementation method is as follows: Figure 22 As shown, in this embodiment, the insulating fixing part includes a sealing ring 15 and a supporting plastic 16. Part of the sealing ring 15 is located between the inner surface of the first protrusion 13 and the connecting wall 1A, and part of the sealing ring 15 is located between the outer wall of the pole post 12 and the inner wall of the pole post mounting hole. Part of the supporting plastic 16 is located between the second protrusion 14 and the outer surface of the connecting wall 1A, and part of the supporting plastic 16 is located between the outer wall of the pole post 12 and the inner wall of the pole post mounting hole, and is in contact with the sealing ring 15. The second protrusion 14 and the pole post 12 are separate structures that are then fixed together.

[0203] Thus, during the assembly of the pole post 12, the sealing ring 15 can be fitted onto the pole post 12 first, with the sealing ring 15 supported by the first protrusion 13. Then, the pole post 12 is installed inside the pole post mounting hole in the direction from the inside out, so that the inner surface of the connecting wall 1A abuts against the opposite side wall of the sealing ring 15. After the pole post 12 is assembled in place, the supporting plastic 16 and the second protrusion 14 are sequentially fitted into the outer end of the pole post 12. The pole post 12 and the second protrusion 14 are pressed together by a jig, so that the sealing ring 15 reaches the designed compression amount. Then, the pole post 12 and the second protrusion 14 are fixed together by welding, ensuring the reliability of the connection between the pole post 12 and the connecting wall 1A, as well as the sealing and insulation performance of the pole post 12 and the connecting wall 1A.

[0204] The second implementation method is as follows: Figure 23 As shown, in this embodiment, the insulating fixing part includes a sealing ring 15 and a supporting plastic 16. Part of the sealing ring 15 is located between the inner surface of the first protrusion 13 and the connecting wall 1A, and part of the sealing ring 15 is located between the outer wall of the pole post 12 and the inner wall of the pole post mounting hole. Part of the supporting plastic 16 is located between the second protrusion 14 and the outer surface of the connecting wall 1A, and part of the supporting plastic 16 is located between the outer wall of the pole post 12 and the inner wall of the pole post mounting hole, and is in contact with the sealing ring 15. The second protrusion is formed by stamping the pole post 12.

[0205] Thus, during the assembly of the pole post 12, the sealing ring 15 can be fitted onto the pole post 12 first, with the sealing ring 15 supported by the first protrusion 13. Then, the pole post 12 is installed inside the pole post mounting hole in the direction from the inside out, so that the inner surface of the connecting wall 1A abuts against the opposite side wall of the sealing ring 15. After the pole post 12 is assembled in place, the outer end of the pole post 12 is fitted into the supporting plastic 16. Then, the outer end of the pole post 12 is stamped by the stamping mechanism to form the second protrusion 14. The second protrusion 14 presses against the outer surface of the supporting plastic 16, and makes the sealing ring 15 reach the designed compression amount, ensuring the reliability of the connection between the pole post 12 and the connecting wall 1A, as well as the sealing performance and insulation performance between the pole post 12 and the connecting wall 1A.

[0206] The third implementation method is as follows: Figure 32 As shown, the insulating fixing part includes a sealing ring 15 and a supporting plastic 16. Part of the supporting plastic 16 is located between the inner surface of the first protrusion 13 and the connecting wall 1A, and part of the supporting plastic 16 is located between the outer wall of the pole post 12 and the inner wall of the pole post mounting hole. Part of the sealing ring 15 is located between the second protrusion 14 and the outer surface of the connecting wall 1A, and part of the sealing ring 15 is located between the outer wall of the pole post 12 and the inner wall of the pole post mounting hole, and is in contact with the supporting plastic 16. The second protrusion 14 and the pole post 12 are separate structures that are then fixed together.

[0207] Thus, during the assembly of the pole post 12, the supporting plastic 16 can be fitted onto the pole post 12 first, with the supporting plastic 16 supporting the first protrusion 13. Then, the pole post 12 is installed inside the pole post mounting hole in the direction from the inside out, so that the inner surface of the connecting wall 1A abuts against the opposite side wall of the supporting plastic 16. After the pole post 12 is assembled in place, the sealing ring 15 and the second protrusion 14 are sequentially fitted into the outer end of the pole post 12. The pole post 12 and the second protrusion 14 are pressed together by a jig so that the sealing ring 15 reaches the designed compression amount. Then, the pole post 12 and the second protrusion 14 are fixed together by welding, ensuring the reliability of the connection between the pole post 12 and the connecting wall 1A, as well as the sealing and insulation performance of the pole post 12 and the connecting wall 1A.

[0208] The fourth implementation method is as follows: Figure 33 As shown, the insulating fixing part is an injection molded part 17. The injection molded part 17 and the pole post 12 are connected by injection molding process. The injection molded part 17 and the connecting wall 1A are connected by injection molding process. The second protrusion 14 and the pole post 12 are integrally formed. The outer diameter of the second protrusion 14 is not greater than the inner diameter of the pole post mounting hole.

[0209] Thus, the second protrusion 14 is integrally formed during the processing of the pole post 12. The outer diameter of the second protrusion 14 is not greater than the inner diameter of the pole post mounting hole, ensuring that the second protrusion 14 can pass through the pole post mounting hole. During the assembly of the pole post 12, the pole post 12 is installed inside the pole post mounting hole in the direction from the inside to the outside. Then, the pole post 12 and the connecting wall 1A are connected as one piece using a nano-injection molding process, ensuring the reliability of the connection between the pole post 12 and the connecting wall 1A, as well as the sealing and insulation performance of the pole post 12 and the connecting wall 1A.

[0210] Depend on Figure 23 As can be seen, in practice, the sealing ring 15 extends beyond the outer edge of the first protrusion 13 to ensure the insulation performance of the inner end of the pole post 12 and the connecting wall 1A.

[0211] In practice, the material supporting plastic 16 can be PPS plastic (Polyphenylene sulfide). PPS plastic is a new type of high-performance thermoplastic resin with advantages such as high mechanical strength, high temperature resistance, chemical resistance, flame retardancy, good thermal stability, and excellent electrical properties.

[0212] In practice, the material of the sealing ring 15 includes, but is not limited to, fluororubber.

[0213] In practice, the positive electrode post 12A and the second protrusion 14 connected to the positive electrode post 12A can be made of aluminum alloy, and the negative electrode post 12B and the second protrusion 14 connected to the negative electrode post 12B can be made of copper alloy or aluminum alloy.

[0214] Please refer to Figures 34-38 , Figure 34 for Figure 1 A schematic diagram of a battery cell with a terminal post at one end; Figure 35 This is a schematic diagram of the structure of the battery cell provided in the twelfth specific embodiment of the present application, showing the end of the electrode post provided. Figure 36 This is a schematic diagram of the structure of the battery cell provided in the thirteenth specific embodiment of the present application, showing the terminal post at one end. Figure 37 This is a schematic diagram of the structure of the battery cell provided in the fourteenth specific embodiment of the present application, showing the terminal post at one end. Figure 38 This is a schematic diagram of the structure of the battery cell provided in the fifteenth specific embodiment of this application, showing the terminal end provided.

[0215] like Figure 34 As shown, in this embodiment, the outer contour of the pole post 12 is the same as the outer contour of the pole plate 22, and is racetrack-shaped; as Figure 35 As shown, in this embodiment, the outer contour of the pole post 12 is the same as the outer contour of the pole plate 22, and is circular; as Figure 36 As shown, in this embodiment, the outer contour of the pole post 12 is the same as the outer contour of the pole plate 22, and is square; Figure 37 As shown, in this embodiment, the outer contour of the electrode post 12 is square, and the outer contour of the electrode plate 22 is circular; as Figure 37 As shown, in this embodiment, the outer contour of the pole post 12 is the same as the outer contour of the pole plate 22, and it is a rounded rectangle.

[0216] Therefore, in practice, the outer contour of the pole post 12 and the outer contour of the pole plate 22 can be the same or different.

[0217] Furthermore, the housing 11 in this embodiment also includes an explosion-proof valve 18, which is used to release the internal gas pressure to the outside when thermal runaway occurs inside the battery, thereby preventing the battery from exploding and improving the battery's safety performance.

[0218] exist Figures 34-37 In the embodiment shown, the explosion-proof valve 18 and the pole post 12 are disposed on the same side wall of the housing 11. Figure 38 In the embodiment shown, the explosion-proof valve 18 and the pole post 12 are disposed on different side walls of the housing 11.

[0219] It is understandable that the larger the area of ​​the connection surface formed by the electrode post 12 or electrode plate 22 for external conductive connection, the better the current carrying capacity of the battery cell can be. Therefore, when the explosion-proof valve 18 and the electrode post 12 are arranged on different side walls of the housing 11, the electrode post 12 has a larger arrangement space, and the cross-sectional area of ​​the electrode post 12 and electrode plate 22 can be increased, thereby increasing the area of ​​the connection surface formed by the electrode post 12 or electrode plate 22 for external conductive connection, improving the current carrying capacity of the battery cell, and meeting the fast charging design requirements.

[0220] In practice, the explosion-proof valve 18 is made of the same material as the housing 11, such as aluminum alloy, steel, or stainless steel.

[0221] Please refer to Figure 39 , Figure 39 This is a schematic diagram of the seventeenth specific embodiment of the battery cell provided in this application.

[0222] In addition to the aforementioned square cell design, the battery cell in this embodiment can also be applied to the design scheme of blade structure battery cell. Specifically, the terminal 12 includes a positive terminal 12A and a negative terminal 12B. The housing 11 includes a housing body 111 and a cover plate 112. The interior of the housing body 111 is hollow, and both ends of the length direction of the housing body 111 are open ends. The housing body 111 has a square tube structure. The cover plate 112 is connected to the open ends of the housing body 111. The core assembly 2 is located inside the housing body 111. The positive terminal 12A and the negative terminal 12B are respectively disposed on the two cover plates 112.

[0223] This embodiment also provides a method for assembling a battery cell, which includes the following steps:

[0224] Step S100: Conduct a conductive connection operation on the electrode plate 22 and the electrode tab 211, and assemble them to form the winding core assembly 2;

[0225] Step S200: The core assembly 2 is installed inside the housing 11, such that at least a portion of the tabs 211 pass through the through hole 12a from the receiving space, and at least a portion of the electrode plates 22 pass through the through hole 12a from the receiving space, and the electrode plates 22 and the electrode posts 12 are positioned and engaged.

[0226] Step S300: Perform a conductive connection operation on the electrode plate 22 and the electrode post 12.

[0227] The battery cell assembly method of this embodiment is used to assemble the aforementioned battery cell, and therefore has the same technical effect as the aforementioned battery cell, so it will not be described again here.

[0228] The electrode plate 22 and the tab 211 are electrically connected by means of ultrasonic welding or laser welding.

[0229] The electrode plate 22 and the electrode post 12 are electrically connected by means of ultrasonic welding or laser welding.

[0230] Furthermore, in step S100, assembling the core assembly 2 further includes the following steps:

[0231] Step S101: Connect at least one of the tab 211 and the electrode plate 22 to the electrode plate support 23, and place the electrode plate support 23 between the end face of the core 21 near the pole post 12 and the electrode plate 22 to support the electrode plate 22.

[0232] Thus, the electrode plate bracket 23 supports the core 21 and the electrode plate 22, so that the electrode plate 22 can maintain a relatively fixed state with the core 21, ensuring that the electrode plate 22 can be stably in the preset installation position, improving the positional accuracy of the electrode plate 22, and facilitating the conductive connection operation between the electrode plate 22 and the electrode post 12.

[0233] Furthermore, in step S100, assembling the core assembly 2 further includes the following steps:

[0234] Step S102: Install the core support 24 onto the core 21, such that the free end of the tab baffle 241 abuts against the surface of the root of the tab 211 facing the pole post 12.

[0235] In this way, the shape of the root of the tab 211 is constrained by the tab baffle 241, reducing the occupancy of the root of the tab 211 in the height space and improving the utilization rate of the cell height space; at the same time, it avoids interference between the root of the tab 211 and the pole post 12, ensuring that when the core assembly 2 is inserted into the shell, the pole plate 22 and the tab 211 can smoothly enter the inner hole of the pole post 12, ensuring reliable positioning of the pole plate 22 and the pole post 12.

[0236] Furthermore, in step S100, assembling the core assembly 2 further includes the following steps:

[0237] Before step S102, step S1011 is included: fixing the insulating film 25 to the core support 24;

[0238] Step S103 is included after step S102: the portion of the core 21 excluding the tabs 211 and the portion of the core support 24 excluding the protrusions 2421 are wrapped inside the insulating film 25.

[0239] As described above, the insulating film 25 can provide insulation protection for the core 21 and prevent the core 21 from being scratched or damaged during the assembly process. At the same time, the core support 24 is also partially wrapped inside the insulating film 25. The insulating film 25 can also effectively fix the core support 24 and the core 21, ensuring that the connection between the two is reliable.

[0240] This embodiment also provides a battery pack, including the aforementioned battery cells.

[0241] The battery pack of this embodiment includes the aforementioned battery cell, and therefore has the same technical effects as the aforementioned battery cell, which will not be described again here.

[0242] This embodiment also provides a vehicle including the aforementioned battery pack.

[0243] The vehicle in this embodiment includes the aforementioned battery pack, and therefore has the same technical effects as the aforementioned battery pack, which will not be repeated here.

[0244] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A battery cell, characterized in that, include: The housing (11) has an internal accommodating space; An electrode post (12) is disposed on the housing (11). The electrode post (12) has a through hole (12a). The hole axis of the through hole (12a) is arranged along the height direction of the electrode post (12). The through hole (12a) communicates with the receiving space. The electrode plate (22), at least a portion of which extends through the receiving space into the through hole (12a) and is electrically connected to the electrode post (12); The core (21) is disposed in the receiving space, and at least a portion of the tabs (211) of the core (21) pass through the receiving space into the through hole (12a) and are electrically connected to the electrode plate (22).

2. The battery cell according to claim 1, characterized in that, Also includes: The electrode support (23) is located between the end face of the core (21) near the pole post (12) and the electrode (22) to support the electrode (22).

3. The battery cell according to claim 2, characterized in that, The tab (211) has a bent portion (2111). The bent portion (2111) is attached between the electrode support (23) and the electrode (22), or the bent portion (2111) is attached to the surface of the electrode (22) away from the electrode support (23).

4. The battery cell according to claim 2, characterized in that, At least a portion of the electrode support (23) extends through the receiving space into the through hole (12a).

5. The battery cell according to claim 4, characterized in that, The electrode support (23) has a protruding structure (23a) that protrudes away from the core (21), the protruding structure (23a) extending along the length of the core (21), the electrode (22) being supported on the protruding structure (23a), and at least a portion of the protruding structure (23a) passing through the receiving space into the through hole (12a).

6. The battery cell according to claim 4, characterized in that, The pole post (12) has an installation groove on its surface facing the core (21). The installation groove extends along the length of the core (21) and penetrates the surface of the pole post (12) facing the core (21). The pole plate bracket (23) is partially embedded in the installation groove.

7. The battery cell according to claim 2 or 4, characterized in that, The electrode plate support (23) has a raised rib (231) on the surface facing the core (21), the raised rib (231) abuts against the end face of the core (21) near the pole post (12), and the electrode plate support (23) supports the electrode plate (22) on the surface facing away from the core (21).

8. The battery cell according to claim 7, characterized in that, The raised rib (231) includes at least one of the following: The first rib (2311) extends along the length direction of the core (21) and abuts against the root of the tab (211); The second rib (2312) extends along the width direction of the core (21), and the surface of the second rib (2312) facing the core (21) is designed according to the root contour of the tab (211).

9. The battery cell according to claim 3, characterized in that, The bent portion (2111) extends along the width direction of the core (21), or the bent portion (2111) has an angle with the width direction of the core (21).

10. The battery cell according to any one of claims 1-6, characterized in that, Also includes: The core support (24) includes a tab baffle (241), the free end of which abuts against the root of the tab (211) on the surface facing the pole post (12).

11. The battery cell according to any one of claims 1-6, characterized in that, The inner wall of the through hole (12a) has a positioning part (12b), and the peripheral wall of the electrode plate (22) has a positioning mating part (22a). The positioning part (12b) and the positioning mating part (22a) cooperate to position each other.

12. The battery cell according to any one of claims 1-6, characterized in that, The housing (11) includes a housing body (111) and a cover plate (112). The housing body (111) and the cover plate (112) enclose the receiving space. The pole post (12) is provided through the bottom wall (111A) of the housing body (111).

13. The battery cell according to claim 12, characterized in that, Also includes: The core support (24) and the housing (11) are clearance-fitted and / or elastic-fitted.

14. The battery cell according to claim 13, characterized in that, The bottom wall (111A) of the shell body (111) is connected to the side wall with rounded corners, and the peripheral wall of the core support (24) is provided with a clearance notch (24c) on the surface away from the core (21).

15. The battery cell according to claim 13, characterized in that, The two ends of the core support (24) in the length direction protrude from the core (21) to form protrusions (2421). The battery cell also includes: An insulating film (25) covers the portion of the core (21) excluding the tab (211) and the portion of the core support (24) excluding the protrusion (2421).

16. A method for assembling a battery cell, used for assembling the battery cell according to any one of claims 1-15, characterized in that, Includes the following steps: Step S100: Conduct a conductive connection operation on the electrode plate (22) and the electrode tab (211) and assemble them to form a winding core assembly (2); Step S200: The core assembly (2) is installed inside the housing (11) such that at least part of the tabs (211) pass through the receiving space into the through hole (12a) and at least part of the electrode plates (22) pass through the receiving space into the through hole (12a), and the electrode plates (22) and the electrode posts (12) are positioned and engaged. Step S300: Perform a conductive connection operation on the electrode plate (22) and the electrode post (12).

17. A battery pack, characterized in that, Includes the battery cell described in any one of claims 1-16.

18. A vehicle, characterized in that, Includes the battery pack as described in claim 17.

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