Battery cell, battery and assembly method

Abstract

The application relates to a battery monomer, a battery and an assembling method, and belongs to the technical field of battery manufacturing. The battery monomer comprises a shell, an electrode assembly comprising a main body and a tab, a cover body and a pole. Two sides of the pole along the thickness direction of the cover body respectively comprise a first surface and a second surface. The first surface is configured as at least part of the side wall of a first groove. The second surface is recessed to form a second groove. The first groove is used for accommodating the tab and is in conductive connection with the tab. The second groove is used for being in conductive connection with an external bus bar. The battery monomer has a compact structure and a high energy density. The application further provides a battery comprising the battery monomer. The application further provides an assembling method for assembling the battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and more specifically, to a battery cell, a battery, and an assembly method. Background Technology

[0002] With the rapid development of the new energy field, lithium batteries have advantages such as high energy density, high voltage, and environmental friendliness. In recent years, they have gradually replaced traditional energy industries, and the manufacturing level has developed rapidly, placing higher demands on energy density and reliability.

[0003] The terminals are electrically connected to the tabs inside the battery cell. A busbar needs to be electrically connected to the terminals to connect multiple battery cells in series or parallel to form a battery module. However, this assembly process usually requires leaving some installation space, reducing the structural compactness and energy density of the battery cells and battery modules. Summary of the Invention

[0004] Therefore, this application proposes a battery cell, a battery, and an assembly method that can improve the energy density of the battery cell and the battery.

[0005] The battery cell of the first aspect of this application includes: a housing with an opening; an electrode assembly disposed inside the housing, the electrode assembly including a body and a tab; a cover with a terminal hole, the cover covering the opening to enclose the electrode assembly inside the housing; and a terminal post installed in the terminal hole, the terminal post having a first surface and a second surface on both sides along the thickness direction of the cover, the first surface forming at least a portion of the sidewall of a first groove, the second surface being recessed to form a second groove, the first groove being used to accommodate the tab and being electrically connected to the tab, and the second groove being used to be electrically connected to an external busbar.

[0006] Optionally, the second groove forms a protrusion corresponding to the first surface. The first groove includes a first bottom wall and a first side wall. The first side wall forms a portion of the surface of the protrusion. The second groove includes a second bottom wall and a second side wall. The first side wall is electrically connected to the tab, and the second side wall is electrically connected to an external busbar. Along the normal of the second side wall, the projections of the first side wall and the second side wall at least partially overlap.

[0007] Optionally, the first groove extends continuously around the protrusion.

[0008] Optionally, the protrusion blocks the first groove to form two sub-grooves that are not connected to each other. The tabs include two sets, and each sub-groove is used to accommodate a set of tabs and is electrically connected to the corresponding set of tabs.

[0009] Optionally, the battery pack further includes an elastic element, at least partially disposed in the first groove, for pressing the tab into the first groove.

[0010] Optionally, the battery cell further includes a contact finger assembly disposed inside the second groove, the second groove being configured to be electrically connected to an external busbar through the contact finger assembly.

[0011] Optionally, the second groove includes a second bottom wall and a second side wall, the second side wall extending around the second bottom wall and being electrically connected to the finger assembly.

[0012] Optionally, the pole post includes a first part and a second part, the surface of the first part is configured as a partial sidewall of the first groove, the second groove is formed in the first part, the second part is connected to the cover body, the first part and the second part are welded together, and the electrode tab and the pole post are welded together on the first surface.

[0013] Optionally, the battery cell further includes: a first insulating member, the electrode post being installed in the electrode post hole through the first insulating member, the outer side of the electrode post being provided with a first limiting portion, the first insulating member being provided with a second limiting portion, and the first limiting portion and the second limiting portion engaging in a concave-convex fit.

[0014] The battery of the second aspect embodiment of this application includes: a plurality of battery cells as described in the first aspect embodiment of this application; a busbar for electrically connecting at least two battery cells, including conductive protrusions, the conductive protrusions being inserted into the second groove to achieve conductive connection between the battery cells and the busbar.

[0015] The method for assembling a battery cell according to a third aspect of this application, used for the battery cell described in the first aspect of this application, includes: The electrode tab is positioned inside the first groove; The tab is welded to the pole post; The shell is welded to the cover; The conductive protrusion of the busbar is inserted into the second groove to achieve a conductive connection between the battery cell and the busbar.

[0016] Optionally, the step of "welding the tab to the pole post" includes: The pole post is welded to the tab from one side of the second surface.

[0017] Optionally, the electrode post includes a first portion and a second portion, the first portion being configured as a portion of the sidewall of the first groove, the second groove being formed in the first portion, and the "welding the electrode tab to the electrode post" includes: The first portion is welded to the electrode tab from one side of the first surface; Connect the second part to the cover; The cover is used to close the opening of the housing, and the first part is welded to the second part.

[0018] Optionally, the battery cell further includes a contact finger assembly, wherein "inserting the conductive protrusion into the second groove" includes: The finger assembly is disposed inside the second groove; The conductive protrusion is inserted into the finger assembly, and the inner wall of the second groove is conductively connected to the busbar through the finger assembly.

[0019] Compared with existing technologies, this solution has the following advantages: In this embodiment of the application, the terminal post of the battery cell is accommodated by a first groove and is electrically connected to the tab, and the second groove is electrically connected to the busbar. Since the first groove provides space to accommodate the tab, the battery cell and battery structure are compact and have high energy density.

[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application; Figure 2 A cross-sectional view of a battery cell provided in an embodiment of this application; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 A cross-sectional view of the electrode post of a first type of battery cell provided in an embodiment of this application; Figure 5This is a schematic diagram of the structure of a second type of electrode post for a battery cell provided in an embodiment of this application; Figure 6 This is a schematic diagram of the third type of electrode post of a battery cell provided in the embodiments of this application; Figure 7 This is a schematic diagram of the structure related to the fourth type of electrode post of the battery cell provided in the embodiments of this application; Figure 8 A schematic diagram of the welding process related to the fourth type of electrode post of the battery cell provided in the embodiments of this application; Figure 9 This is a schematic diagram of the battery structure provided in an embodiment of this application.

[0023] Icons: 100 - Battery cell; 110 - Housing; 120 - Cover; 121 - Terminal hole; 130 - Electrode assembly; 131 - Body; 132 - Tab; 140 - Terminal; 141 - First groove; 1411 - First bottom wall; 1412 - First side wall; 1413 - Third side wall; 142 - Second groove; 1421 - Second bottom wall; 1422 - Second side wall; 1423 - Long side wall; 1424 - Short side wall ; 1425 - Sub-groove; 143 - First surface; 144 - Second surface; 145 - Protrusion; 146 - First part; 147 - Second part; 1471 - Mounting hole; 148 - First limiting part; 150 - Finger assembly; 160 - Elastic element; 170 - First insulating element; 171 - Second limiting part; 180 - Elastic element; 200 - Battery; 210 - Busbar; 211 - Conductive protrusion; 212 - Plate. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] like Figure 1 , Figure 2 and Figure 3As shown, in some embodiments of this application, the battery cell 100 includes a housing 110, a cover 120, an electrode assembly 130, and a terminal post 140. The housing 110 has an opening, and the cover 120 has a terminal post hole 121. The cover 120 closes the opening to enclose the electrode assembly 130 inside the housing 110. The electrode assembly 130 is disposed inside the housing 110 and includes a body 131 and a tab 132. The terminal post 140 is mounted in the terminal post hole 121. The two sides of the terminal post 140 along the thickness direction of the cover 120 respectively include a first surface 143 and a second surface 144. The first surface 143 forms at least a portion of the sidewall of a first groove 141, and the second surface 144 is recessed to form a second groove 142. The first groove 141 is used to receive the tab 132 and is electrically connected to the tab 132. The second groove 142 is used to be electrically connected to an external busbar 210.

[0027] The thickness direction of the pole post 140 extends along the Z direction. The first surface 143 and the second surface 144 are respectively disposed on opposite sides of the pole post 140 along the Z direction. Both the first surface 143 and the second surface 144 are parallel to the XY plane.

[0028] The first groove 141 includes a first bottom wall 1411 and a first side wall 1412. The first surface 143 can be constructed as the first bottom wall 1411 and the first side wall 1412. Alternatively, the first surface 143 can be constructed as only the first bottom wall 1411. The pole post 132 is recessed into the surface of the cover 120 on one side of the first surface 143, and the first side wall 1412 is constructed from the hole wall of the pole post hole 121. The cover 120 and the pole post 140 together form the first groove 141.

[0029] When the first surface 143 is recessed to form the first groove 141, the first surface 143 is recessed along the Z direction to form the first groove 141, and the second surface 144 is recessed along the Z direction to form the second groove 142; the first surface 143 and the second surface 144 may also be recessed along other directions inclined to the Z direction to form corresponding groove structures.

[0030] In this embodiment of the application, the terminal post 140 of the battery cell 100 accommodates the tab 132 through the first groove 141 and is electrically connected to the tab 132. The second groove 142 is electrically connected to the bus 210. Since the first groove 141 provides space to accommodate the tab 132, the battery cell 100 has a compact structure and high energy density.

[0031] like Figure 3 and Figure 4As shown, in some embodiments of this application, the second groove 142 forms a protrusion 145 corresponding to the first surface 143. The first groove 141 includes a first bottom wall 1411 and a first side wall 1412. The first side wall 1412 forms a portion of the surface of the protrusion 145. The second groove 142 includes a second bottom wall 1421 and a second side wall 1422. The first side wall 1412 is electrically connected to the tab 132, and the second side wall 1422 is used to be electrically connected to the external busbar 210. Along the normal of the second side wall 1422, the projections of the first side wall 1412 and the second side wall 1422 are at least partially overlapping.

[0032] The first sidewall 1412 forms the outer peripheral wall of the protrusion 145, and the second surface 144 is recessed along the direction Z to form a second groove 1422. The normal of the second groove 1422 extends along a direction perpendicular to the direction Z. For example, the second groove 1422 is a cylindrical groove, and the normal of the second sidewall 1422 is the radial direction of the cylindrical groove. As another example, the second groove 1422 is a square groove, and the normal of the second sidewall 1422 is the normal of each sidewall of the square groove.

[0033] like Figure 4 As shown, the first groove 141 also includes a third sidewall 1413, which is connected to the first bottom wall 1411. The third sidewall 1413 is disposed opposite to the first sidewall 1412 and extends around the protrusion 145.

[0034] With this configuration, the current flows out from the tab 132 and can flow directly from the first sidewall 1412 to the second sidewall 1422, which greatly shortens the current path and increases the current area, thereby reducing the resistance of the battery cell 100 and improving the fast charging performance of the battery cell 100.

[0035] In some other embodiments of this application, the first bottom wall 1411 may also make conductive contact with the tab 132 to improve the conductivity of the tab 132 and the post 140; the second surface 144 may also make conductive contact with the plate 212 of the busbar 210 to improve the conductivity of the busbar 210 and the post 140; the second bottom wall 1421 may also be conductively connected to the bottom surface of the conductive protrusion 211 of the busbar 210.

[0036] like Figure 3 As shown, in some embodiments of this application, the battery cell 100 further includes a finger assembly 150 disposed inside the second groove 142, the second groove 142 being configured to be electrically connected to the external busbar 210 through the finger assembly 150.

[0037] By setting the contact finger assembly 150, the contact pressure between the second groove 142 and the conductive protrusion 211 of the external busbar 210 can be increased, thereby improving the conductivity of the pole post 140 and the conductive protrusion 211. Furthermore, the use of the contact finger assembly 150 can ensure that the pole post 140 and the busbar 210 have stable current carrying capacity while being detachable, making it convenient to replace structural components.

[0038] like Figure 3 and Figure 4 As shown, in some embodiments of this application, the second groove 142 includes a second bottom wall 1421 and a second side wall 1422, the second side wall 1422 extending around the second bottom wall 1421, and the second side wall 1422 being electrically connected to the finger assembly 150.

[0039] As an example, such as Figure 4 As shown, the second groove 142 has a narrow and elongated structure, and the second sidewall 1422 includes two oppositely arranged long sidewalls 1423 and two oppositely arranged short sidewalls 1424. At least two long sidewalls 1423 are used for conductive connection with the finger assembly 150.

[0040] With this configuration, the second sidewall 1422 is electrically connected to the conductive protrusion 211 of the busbar 210 via the contact finger assembly 150. The contact finger assembly 150, as a conductive element, increases the contact pressure and release point, thereby improving the conductivity of the pole post 140 and the conductive protrusion 211.

[0041] like Figure 5 As shown, in some embodiments of this application, the first groove 141 extends continuously around the protrusion 145.

[0042] In other words, the first sidewall 1412, as the outer peripheral wall of the protrusion 145, is a closed annular structure, and the first groove 141 is a closed annular groove extending around the protrusion 145.

[0043] This arrangement increases the accommodating space of the first groove 141, thereby fully accommodating the tab 132 and improving the compactness and energy density of the battery cell 100.

[0044] like Figure 6 As shown, in some other embodiments of this application, the protrusion 145 blocks the first groove 141 to form two sub-grooves 1425 that are not connected to each other. The tabs 132 include two sets, and each sub-groove 1425 is used to accommodate a set of tabs 132 and is electrically connected to the corresponding set of tabs 132.

[0045] This configuration allows each tab 132 to correspond to a sub-groove 1425, thus simplifying the assembly process of the tab 132 and the pole post 140.

[0046] like Figure 7 and Figure 8 As shown, in some embodiments of this application, the pole post 140 includes a first portion 146 and a second portion 147. The surface of the first portion 146 is configured as a partial sidewall of a first groove 141. A second groove 142 is formed in the first portion 146. The second portion 147 is connected to the cover 120. The first portion 146 and the second portion 147 are welded together. The tab 132 and the solder mark of the pole post 140 are formed on the first surface 143.

[0047] It is understandable that the solder marks on tab 132 and post 140 refer to the marks formed from one side of the solder head using a welding process.

[0048] A first sidewall 1412 of the first groove 141 is formed in the first portion 146, a portion of the first bottom wall 1411 is formed in the first portion 146, and a third sidewall 1413 is formed in the second portion 147; or, the bottom wall of the first portion 146 is configured as the first bottom wall 1411 of the first groove 141.

[0049] The outer wall of the first part 146 is welded to the wall of the mounting hole 1471, and the second part 147 is insulated from the cover 120 by the first insulating member 170 described below.

[0050] This configuration allows for welding of the electrode post 140 to the tab 132 from the first surface 143 side of the electrode post 140, with the solder mark formed on the first surface 143. Since the tab 132 of the electrode assembly 130 needs to be flattened within the first groove 141 before welding, the first part 146 only includes a portion of the sidewall of the first groove 141, thus reducing the difficulty of flattening the tab 132 within the first groove 141. This enables welding operations from the tab 132 side, ensuring the welding quality between the tab 132 and the electrode post 140.

[0051] In some other embodiments of this application, the pole post 140 may also be an integral structure.

[0052] With this arrangement, after the tabs 132 and the posts 140 are stacked, they can be welded through from the outside of the cover 120, and then the cover 120 is closed with the housing 110 to complete the assembly process of the battery cell 100.

[0053] like Figure 7 As shown, in some embodiments of this application, the battery cell 100 further includes a first insulating member 170, the terminal post 140 is installed in the terminal post hole 121 through the first insulating member 170, the outer side of the terminal post 140 is provided with a first limiting part 148, the first insulating member 170 is provided with a second limiting part 171, and the first limiting part 148 and the second limiting part 171 are in concave-convex cooperation.

[0054] The first limiting part 148 has a groove structure, and the second limiting part 171 has a protruding structure. When the first insulating member 170 and the pole post 140 are assembled along the Z direction, the first limiting part 148 and the second limiting part 171 are laterally engaged. In the circumferential direction of the pole post 140, the first limiting part 148 can extend continuously along the outer surface of the pole post 140, or it can be arranged in multiple points; the second limiting part 171 is provided in a one-to-one correspondence with the first limiting part 148.

[0055] This arrangement improves the assembly strength between the first insulator 170 and the pole post 140, reducing the risk of the pole post 140 detaching from the first insulator 170.

[0056] like Figure 7 As shown, in some embodiments of this application, the battery cell 100 further includes an elastic member 180, which is at least partially disposed in the first groove 141 for pressing the tab 132 into the first groove 141.

[0057] The elastic element 180 can be completely disposed in the first groove 141 or partially extended into the first groove 141; the elastic element 180 can press the tab 132 against the first sidewall 1412 of the first groove 141, or press it against both the first bottom wall 1411 and the first sidewall 1412 simultaneously; the elastic element 180 can be a spring or an insulating patch. For example, if the elastic element 180 is an insulating patch, the tab 132 is curled up and accommodated in the first groove 141, the insulating patch is attached to the inner side of the curled shape of the tab 132, the outer side of the curled shape of the tab 132 contacts the first groove 141, and the insulating patch opens the tab 132 from the inside, pressing the tab 132 against the first groove 141.

[0058] With this configuration, the tab 132 is pressed against the first groove 141 by the elastic member 180, so that the first groove 141 and the tab 132 have sufficient contact pressure, thereby achieving a reliable conductive connection between the tab 132 and the post 140.

[0059] Based on the implementation of "the pole post 140 is an integral structure", the pole tab 132 is flattened inside the first groove 141 by the elastic element 180, and penetration welding is performed from the second surface 144 side, thereby improving the welding quality of the pole tab 132 and the pole post 140.

[0060] like Figure 1 , Figure 3 and Figure 9 As shown, in some embodiments of this application, the battery 200 includes a busbar 210 and a plurality of battery cells 100. The busbar 210 is used to electrically connect at least two battery cells 100 and includes a conductive protrusion 211. The conductive protrusion 211 is inserted into a second groove 142 to achieve a conductive connection between the battery cell 100 and the busbar 210.

[0061] Due to the characteristics of the battery cell 100 in this application embodiment, the battery 200 in this application embodiment also has good structural compactness and improves energy density.

[0062] This application provides a method for assembling a battery cell 100 according to some embodiments. The assembly method includes: S100: The electrode tab 132 is disposed inside the first groove 141; S200: Weld the tab 132 to the post 140; S300: Weld the housing 110 to the cover 120 together; S400: Insert the conductive protrusion 211 of the busbar 210 into the second groove 142 to achieve conductive connection between the battery cell 100 and the busbar 210.

[0063] When the battery cell 100 of this application is assembled using the assembly method of this application embodiment, the battery cell 100 has a compact structure and high energy density because the tab 132 is disposed inside the first groove 141.

[0064] In some embodiments of this application, S200: welding the tab 132 to the post 140 includes: S210: The pole post 140 is welded to the tab 132 from one side of the second surface 144.

[0065] By using the above method, after the tab 132 and the terminal post 140 are stacked, they can be penetrated and welded from the outside of the cover 120. Then, the cover 120 is closed with the shell 110 to complete the assembly process of the battery cell 100.

[0066] In other embodiments of this application, the pole post 140 includes a first portion 146 and a second portion 147, the first portion 146 forming a portion of the sidewall of a first groove 141, and a second groove 142 formed in the first portion 146. S200: Welding the tab 132 to the pole post 140, including: S220: The first portion 146 is welded to the tab 132 from one side of the first surface 143; S230: Connect the second part 147 to the cover 120; S240: Cover the opening of the housing 110 with the cover 120, and weld the first part 146 to the second part 147.

[0067] Since the tab 132 is curled up and accommodated in the first groove 141, it increases the difficulty for the welding head to enter the first groove 141 to weld from the side of the tab 132. The conventional process is usually to weld from the side of the tab 132 to ensure the conductivity and connection strength between the tab 132 and the post 140.

[0068] Using the above method, the pole post 140 is divided into a first part 146 and a second part 147. The first part 146 is constructed as part of the sidewall of the first groove 141, rather than the complete first groove 141. Thus, during the welding process of the tab 132, there is enough space in the part of the first groove 141 to flatten it, thereby allowing welding operations to be carried out from one side of the tab 132, ensuring the welding quality between the tab 132 and the pole post 140.

[0069] In some embodiments of this application, the battery cell 100 further includes a finger assembly 150, S400: inserting the conductive protrusion 211 into the second groove 142, including: S410: The finger assembly 150 is disposed inside the second groove 142; S420: The conductive protrusion 211 is inserted into the finger assembly 150, and the inner wall of the second groove 142 is electrically connected to the bus 210 through the finger assembly 150.

[0070] The above method can complete the assembly process of the finger assembly 150. The finger assembly 150 can increase the contact pressure between the second groove 142 and the conductive protrusion 211 of the external busbar 210, thereby improving the conductivity of the pole post 140 and the conductive protrusion 211.

[0071] The battery cell 100 of this application embodiment is not only compact in structure and has high energy density, but also fully considers the welding process of the tab 132 and the terminal 140, which improves the manufacturing process level and the assembly cost and efficiency of the battery cell 100.

[0072] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0073] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell (100), characterized in that, include: The housing (110) has an opening; An electrode assembly (130) is disposed inside the housing (110), and the electrode assembly (130) includes a main body (131) and a tab (132). The cover (120) is provided with an electrode post hole (121), and the cover (120) covers the opening to enclose the electrode assembly (130) inside the housing (110); An electrode post (140) is installed in the electrode post hole (121). The electrode post (140) has a first surface (143) and a second surface (144) on both sides along the thickness direction of the cover (120). The first surface (143) is configured as at least a part of the sidewall of the first groove (141). The second surface (144) is recessed to form a second groove (142). The first groove (141) is used to accommodate the electrode tab (132) and is electrically connected to the electrode tab (132). The second groove (142) is used to be electrically connected to an external busbar. The second groove (142) forms a protrusion (145) corresponding to the first surface (143). The first groove (141) includes a first bottom wall (1411) and a first side wall (1412). The first side wall (1412) forms part of the surface of the protrusion (145). The second groove (142) includes a second bottom wall (1421) and a second side wall (1422). The first sidewall (1412) is electrically connected to the tab (132), and the second sidewall (1422) is electrically connected to an external busbar. Along the normal of the second sidewall (1422), the projections of the first sidewall (1412) and the second sidewall (1422) are at least partially overlapping. The pole post (140) includes a first part (146) and a second part (147). The surface of the first part (146) is configured as a partial sidewall of the first groove (141). The second groove (142) is formed in the first part (146). The second part (147) is connected to the cover (120). The first part (146) and the second part (147) are welded together. The electrode tab (132) and the solder mark of the pole post (140) are formed on the first surface (143). The first groove (141) further includes a third sidewall (1413), which is connected to the first bottom wall (1411), and is disposed opposite to the first sidewall (1412). The third sidewall (1413) extends around the protrusion (145). The first sidewall (1412) of the first groove (141) is formed in the first portion (146), a portion of the first bottom wall (1411) is formed in the first portion (146), and the third sidewall (1413) is formed in the second portion (147). The electrode tab (132) is welded to the electrode post (140), including: The first portion (146) is welded to the tab (132) from one side of the first surface (143); Connect the second part (147) to the cover (120); The cover (120) is used to cover the opening of the housing (110), and the first part (146) is welded to the second part (147).

2. The battery cell (100) according to claim 1, characterized in that, The first groove (141) extends continuously around the protrusion (145).

3. The battery cell (100) according to claim 1, characterized in that, The protrusion (145) blocks the first groove (141) to form two sub-grooves that are not connected to each other. The tabs (132) include two sets. Each sub-groove is used to accommodate a set of tabs (132) and is electrically connected to the corresponding set of tabs (132).

4. The battery cell (100) according to claim 1, characterized in that, Also includes: An elastic element, at least partially disposed in the first groove (141), is used to press the tab (132) into the first groove (141).

5. The battery cell (100) according to claim 1, characterized in that, Also includes: A finger assembly (150) is disposed inside the second groove (142), the second groove (142) being configured to be electrically connected to an external busbar via the finger assembly (150).

6. The battery cell (100) according to claim 5, characterized in that, The second groove (142) includes a second bottom wall (1421) and a second side wall (1422), the second side wall (1422) extending around the second bottom wall (1421) and electrically connected to the finger assembly (150).

7. The battery cell (100) according to claim 1, characterized in that, Also includes: The first insulating member (170) is installed in the pole hole (121) through the first insulating member (170). The outer side of the pole (140) is provided with a first limiting part (148). The first insulating member (170) is provided with a second limiting part (171). The first limiting part (148) and the second limiting part (171) are in concave-convex cooperation.

8. A battery (200), characterized in that, include: Multiple battery cells (100) as described in any one of claims 1 to 7; Busbar (210) for electrically connecting at least two battery cells includes a conductive protrusion (211) that is inserted into the second groove (142) to achieve conductive connection between the battery cell (100) and the busbar (210).

9. A method for assembling a battery cell, used to assemble a battery cell (100) as described in any one of claims 1 to 7, characterized in that, include: The tab (132) is disposed inside the first groove (141); The tab (132) is welded to the post (140), the first sidewall (1412) is electrically connected to the tab (132), and the second sidewall (1422) is electrically connected to the external busbar. The shell (110) is welded to the cover (120); The conductive protrusion (211) of the busbar (210) is inserted into the second groove (142) to achieve conductive connection between the battery cell (100) and the busbar (210); The phrase "welding the tab (132) to the post (140)" includes: The first portion (146) is welded to the tab (132) from one side of the first surface (143); Connect the second part (147) to the cover (120); The cover (120) is used to cover the opening of the housing (110), and the first part (146) is welded to the second part (147).

10. The assembly method according to claim 9, characterized in that, The battery cell (100) also includes a contact assembly (150) for "inserting the conductive protrusion (211) into the second groove (142)," including: The finger assembly (150) is disposed inside the second groove (142); The conductive protrusion (211) is inserted into the finger assembly (150), and the inner wall of the second groove (142) is electrically connected to the busbar (210) through the finger assembly (150).

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