Battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell and a battery pack. Wherein the battery cell comprises a pole group, a shell, pole columns and welding bottom plates, the shell is provided with a containing cavity, the top wall of the shell is provided with two through holes and two through holes at intervals in the length direction of the shell, the pole columns are inserted into the through holes in a one-to-one correspondence mode, the lower surfaces of the pole columns are provided with mounting grooves, and the welding bottom plates are arranged at the bottoms of the pole columns in a one-to-one correspondence mode and located in the containing cavity; the upper surface of the welding bottom plate is provided with a lug boss corresponding to the mounting groove; the welding bottom plate and the pole are inserted into the mounting groove through the lug boss, and the top surface of the lug boss is welded with the bottom surface of the mounting groove to realize connection. According to the utility model, the top wall of the shell is provided with the through hole, and the welding bottom plate and the tab can be welded and connected through the through hole, so that the tab is prevented from being bent after being welded to occupy a space, the length of the tab is shortened, the use space of the accommodating cavity in the shell in the length direction is increased, and the utilization rate of the internal space of the battery cell is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell and a battery pack. Background Art

[0002] With the increasing maturity of battery technology, batteries are widely used in electric vehicles and energy storage fields, and the requirements for the use performance and safety of batteries are increasing day by day. A battery cell is the basic component unit of a battery and can independently generate and store electrical energy.

[0003] In the prior art, both the connecting piece and the tab need to be bent, and the connecting piece, the terminal post and the tab are usually located on the same vertical plane. Therefore, a large space inside the battery cell needs to be occupied, resulting in a low space utilization rate of the battery cell. Summary of the Utility Model

[0004] In view of this, the utility model provides a battery cell and a battery pack to solve the problem of low space utilization rate of the battery cell.

[0005] In a first aspect, the utility model provides a battery cell, comprising:

[0006] A pole group, with a negative tab and a positive tab provided at one end;

[0007] A housing, provided with a receiving cavity, and two through holes and two through slots are spaced apart along the length direction of the top wall of the housing. The two through holes are located between the two through slots, and the two through holes respectively allow the negative tab and the positive tab to pass through;

[0008] Terminal posts, respectively inserted into the through slots one by one, and mounting grooves are provided on the lower surfaces of the terminal posts;

[0009] Welding bottom plates, respectively provided at the bottoms of the terminal posts and located in the receiving cavity. Protruding portions corresponding to the mounting grooves are provided on the upper surfaces of the welding bottom plates. The welding bottom plates and the terminal posts are connected by inserting the protruding portions into the mounting grooves and welding the top surfaces of the protruding portions to the bottom surfaces of the mounting grooves.

[0010] Advantageous effects: For this battery cell, when assembling the battery cell, first, the pole group is inserted into the receiving cavity from the opening at the bottom of the housing. Since two through holes are provided on the top wall of the housing and the positions of the two through holes correspond to those of the negative tab and the positive tab, the negative tab and the positive tab on the pole group respectively pass through the two through holes on the top wall. Installers can bend the negative tab and the positive tab through the through holes, so that the negative tab and the positive tab respectively abut against the corresponding welding bottom plates. Installers can also weld and fix the negative tab, the positive tab and the corresponding welding bottom plates through the through holes. Finally, a sealing plate is covered at the through holes to seal the receiving cavity, and the assembly of the battery cell is completed.

[0011] By providing a through-hole on the top wall of the housing, the welding bottom plate and the tab can be welded and connected through the through-hole, thereby avoiding the space occupied by the tab after welding and bending, shortening the length of the tab, increasing the usable space of the accommodation cavity in the housing in the length direction, and thus improving the internal space utilization rate of the battery cell.

[0012] Insert the pole into the corresponding through-hole in the top wall. Since the lower surface of the pole is provided with a mounting groove, and the upper surface of the welding bottom plate is provided with a protruding portion corresponding to the mounting groove, when installing the pole and the welding bottom plate, only need to insert the protruding portion into the mounting groove and weld the top surface of the protruding portion and the bottom surface of the mounting groove to complete the connection, which can simplify the assembly process. Through the welding connection between the protruding portion of the welding bottom plate and the mounting groove of the pole, the connection strength between the welding bottom plate and the pole can be improved, the structural stability of the entire assembly can be enhanced, and loosening or detachment caused by vibration or external force during use can be reduced.

[0013] In an alternative embodiment, a welding groove coaxial with the protruding portion is provided on the lower surface of the protruding portion.

[0014] Beneficial effects: By providing a welding groove on the lower surface of the protruding portion, the top surface of the protruding portion and the bottom surface of the mounting groove are welded through the welding groove, which is convenient for quickly welding the protruding portion and the mounting groove, helps to optimize the welding process, improve the welding quality, and reduce welding defects. At the same time, by providing a welding groove at the top of the protruding portion, the self-weight of the welding bottom plate can be reduced, and thus the weight of the entire battery cell can be reduced. The welding groove is coaxial with the protruding portion. During the installation process of the welding bottom plate, the protruding portion is positioned through the welding groove.

[0015] In an alternative embodiment, a bent portion is provided at the bottom of the pole, and the bent portion extends away from the axis of the pole, and the lower surface of the bent portion abuts against the upper surface of the welding bottom plate.

[0016] Beneficial effects: By the lower surface of the bent portion abutting against the upper surface of the welding bottom plate, the close contact between the welding bottom plate and the pole is ensured, the contact area between the welding bottom plate and the pole is increased, the electrical connection between the pole and the welding bottom plate is guaranteed, loosening or detachment caused by vibration or external force during use is reduced, and the safety of the entire assembly is improved.

[0017] In an alternative embodiment, a welding groove adapted to accommodate the bus bar is provided on the upper surface of the pole.

[0018] Beneficial effects: By providing a welding groove on the upper surface of the pole, due to the matching between the welding groove and the bus bar, it can ensure that the bus bar can be accurately positioned during the assembly process, simplify the assembly steps, and at the same time ensure a smoother connection between the bus bar and the pole, improve the appearance quality, and also improve the connection stability between the pole and the bus bar.

[0019] In an alternative embodiment, a positioning groove is further formed on the upper surface of the pole column, the positioning groove is located within the welding groove and is coaxially arranged with the pole column.

[0020] Beneficial effects: By providing a positioning groove on the upper surface of the pole column, since the positioning groove is coaxially arranged with the pole column, the axis of the pole column can be ensured to be coaxially arranged with the axis of the through hole by positioning the positioning groove, so that the position of the pole column installed in the through hole is accurate, reducing the assembly error.

[0021] In an alternative embodiment, the diameter of the convex portion is smaller than the diameter of the mounting groove, and a chamfer is provided around the top of the outer wall of the convex portion.

[0022] Beneficial effects: By making the diameter of the convex portion smaller than the diameter of the mounting groove, the convex portion can be more easily inserted into the mounting groove, reducing the assembly error. Since a chamfer is provided at the top of the outer wall of the convex portion, during the process of inserting the convex portion into the mounting groove, due to the contact between the chamfer and the bottom of the mounting groove, the convex portion can be more easily inserted into the mounting groove under the guiding action of the chamfer, facilitating the installation of the welding bottom plate and the pole column.

[0023] In an alternative embodiment, the pole column and the welding bottom plate are respectively integrally formed structures.

[0024] Beneficial effects: Through the integrally formed design, the self-strength of the pole column and the welding bottom plate can be improved, which helps to reduce the production cost of the pole column and the welding bottom plate and improve the production efficiency.

[0025] In an alternative embodiment, a first plastic part and a second plastic part are further included. The first plastic part is arranged between the welding bottom plate and the top wall, and the second plastic part is arranged between the pole group and the top wall.

[0026] Beneficial effects: By providing the first plastic part, the direct contact between the welding bottom plate and the top wall is avoided by the first plastic part, improving the insulation performance between the components inside the battery cell and preventing short circuits or contacts between metal components.

[0027] By providing the second plastic part, the direct contact between the pole group and the top wall is avoided by the second plastic part, improving the insulation performance between the components inside the battery cell and preventing short circuits or contacts between metal components.

[0028] In an alternative embodiment, a sealing ring is further included. The sealing ring is sleeved on the pole column, and the sealing ring is arranged between the pole group and the top wall.

[0029] Beneficial effects: By providing a sealing ring between the terminal post and the top wall, the sealing performance of the battery cell is improved. At the same time, the displacement or damage of internal components caused by vibration or impact can be reduced, and the structural stability inside the battery cell is enhanced.

[0030] In a second aspect, the present utility model further provides a battery pack, comprising: a plurality of battery cells.

[0031] Beneficial effects: This battery pack includes the battery cells as described above and has all the beneficial technical effects of the battery cells, which will not be elaborated herein. Description of the Drawings

[0032] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 Structural schematic diagram of a battery cell according to an embodiment of the present utility model;

[0034] Figure 2 For Figure 1 Cross-sectional view of the battery cell shown;

[0035] Figure 3 For Figure 2 Partial enlarged schematic diagram of the terminal post and the welding bottom plate in ;

[0036] Figure 4 Structural schematic diagram of a housing in a battery cell according to an embodiment of the present utility model;

[0037] Figure 5 Structural schematic diagram of a battery cell according to an embodiment of the present utility model, in which the negative electrode tab and the positive electrode tab pass through the through hole without being bent;

[0038] Figure 6 For Figure 5 Structural schematic diagram of the electrode assembly in ;

[0039] Figure 7 Structural schematic diagram of a battery cell according to an embodiment of the present utility model, in which the negative electrode tab and the positive electrode tab pass through the through hole and are bent;

[0040] Figure 8 For Figure 7 Structural schematic diagram of the electrode assembly in.

[0041] Explanation of the reference numerals:

[0042] 1. Polar group; 2. Negative electrode tab; 3. Positive electrode tab; 4. Housing; 401. Top wall; 402. Through hole; 403. Penetrating hole; 5. Sealing plate; 6. Terminal; 601. Mounting groove; 602. Bending portion; 603. Welding groove; 604. Positioning groove; 7. Welding bottom plate; 701. Protrusion; 7011. Welding groove; 7012. Chamfer; 8. First plastic part; 9. Second plastic part; 10. Sealing ring. Detailed implementation manners

[0043] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0044] In the related art, both the connecting piece and the tab need to be bent, and the connecting piece, the terminal and the tab are usually located on the same vertical plane. Therefore, a relatively large space inside the battery cell needs to be occupied, resulting in low space utilization rate of the battery cell.

[0045] To solve the above technical problems, the embodiments of the present utility model will be described below in conjunction with Figures 1 to 8 , describing the embodiments of the present utility model.

[0046] According to the embodiments of the present utility model, on the one hand, as Figures 1 to 8 shown, a battery cell is provided, including a polar group 1, a housing 4, a terminal 6 and a welding bottom plate 7.

[0047] Specifically, as Figure 6 and Figure 8 shown, one end of the polar group 1 is provided with a negative electrode tab 2 and a positive electrode tab 3.

[0048] Specifically, as Figures 1 to 4 shown, a receiving cavity (not shown in the figure) is formed inside the housing 4. Two through holes 402 and two penetrating holes 403 are formed at intervals along the length direction of the top wall 401 of the housing 4. Among them, the two through holes 402 are located between the two penetrating holes 403, and the two through holes 402 are respectively for the negative electrode tab 2 and the positive electrode tab 3 to pass through.

[0049] Specifically, as Figures 1 to 4 shown, the terminals 6 are inserted into the penetrating holes 403 one by one, and mounting grooves 601 are formed on the lower surfaces of the terminals 6.

[0050] Specifically, as Figures 1 to 6As shown, the welding base plate 7 is provided at the bottom of the pole column 6 in a one-to-one correspondence, and the welding base plate 7 is arranged in the accommodating cavity. A convex portion 701 is provided on the upper surface of the welding base plate 7 corresponding to the mounting groove 601. The welding base plate 7 and the pole column 6 are connected by inserting the convex portion 701 into the mounting groove 601, and the top surface of the convex portion 701 is welded to the groove bottom surface of the mounting groove 601 to achieve connection.

[0051] For this battery cell, when assembling the battery cell, first, the electrode assembly 1 is loaded into the accommodating cavity from the opening at the bottom of the housing 4. Since two through holes 402 are provided on the top wall 401 of the housing 4, and the positions of the two through holes 402 correspond to those of the negative electrode tab 2 and the positive electrode tab 3, therefore, the negative electrode tab 2 and the positive electrode tab 3 on the electrode assembly 1 respectively pass through the two through holes 402 on the top wall 401. The installer can bend the negative electrode tab 2 and the positive electrode tab 3 through the through holes 402 so that the negative electrode tab 2 and the positive electrode tab 3 respectively abut against the welding base plate 7 correspondingly. The installer can also weld and fix the negative electrode tab 2, the positive electrode tab 3 and the corresponding welding base plate 7 through the through holes 402. Finally, the sealing plate 5 is covered at the through holes 402 to seal the accommodating cavity, and the assembly of the battery cell is completed.

[0052] By providing the through holes 402 on the top wall 401 of the housing 4, the welding connection between the welding base plate 7 and the electrode tab can be carried out through the through holes 402, thereby avoiding the space occupied by the bending of the electrode tab after welding, shortening the length of the electrode tab, improving the utilization space of the accommodating cavity in the housing 4 in the length direction, and thus improving the internal space utilization rate of the battery cell.

[0053] Insert the pole column 6 into the corresponding through hole 403 on the top wall 401. Since the mounting groove 601 is provided on the lower surface of the pole column 6 and the convex portion 701 corresponding to the mounting groove 601 is provided on the upper surface of the welding base plate 7, when installing the pole column 6 and the welding base plate 7, only need to insert the convex portion 701 into the mounting groove 601 and weld the top surface of the convex portion 701 to the groove bottom surface of the mounting groove 601 to complete the connection, which can simplify the assembly process. Through the welding connection between the convex portion 701 of the welding base plate 7 and the mounting groove 601 of the pole column 6, the connection strength between the welding base plate 7 and the pole column 6 can be improved, the structural stability of the whole assembly can be improved, and the loosening or falling off caused by vibration or external force during use can be reduced.

[0054] Specifically, the mounting groove 601 can be set in any shape such as a circular groove, a square groove, etc. In the embodiment of the present application, the shape of the mounting groove 601 is not specifically limited.

[0055] Specifically, the convex portion 701 on the welding base plate 7 can be set in any shape such as a cylindrical shape, a square column shape, etc. In the embodiment of the present application, the shape of the convex portion 701 is not specifically limited.

[0056] Exemplarily, the installation groove 601 is provided as a circular groove, and the convex portion 701 is provided as a cylindrical shape, so as to facilitate the insertion of the convex portion 701 into the installation groove 601.

[0057] In one embodiment, as Figure 3 shown, a welding groove 7011 is formed on the lower surface of the convex portion 701, and the welding groove 7011 is coaxially arranged with the convex portion 701.

[0058] By forming the welding groove 7011 on the lower surface of the convex portion 701, the top surface of the convex portion 701 and the bottom surface of the installation groove 601 are welded through the welding groove 7011, so as to facilitate the rapid welding of the convex portion 701 and the installation groove 601, which helps to optimize the welding process, improve the welding quality, and reduce welding defects. At the same time, by providing the welding groove 7011 at the top of the convex portion 701, it helps to reduce the self-weight of the welding bottom plate 7, and thus reduce the weight of the entire battery cell. The welding groove 7011 is coaxially arranged with the convex portion 701. During the process of installing the welding bottom plate 7, the convex portion 701 is positioned through the welding groove 7011.

[0059] In one embodiment, as Figure 3 shown, a bending portion 602 is further provided at the bottom of the pole 6, and the bending portion 602 extends in a direction away from the axis of the pole 6, and the lower surface of the bending portion 602 abuts against the upper surface of the welding bottom plate 7.

[0060] By abutting the bending portion 602 against the upper surface of the welding bottom plate 7, it ensures the close contact between the welding bottom plate 7 and the pole 6, increases the contact area between the welding bottom plate 7 and the pole 6, guarantees the electrical connection between the pole 6 and the welding bottom plate 7, reduces looseness or detachment caused by vibration or external force during use, and improves the safety of the entire assembly.

[0061] Specifically, the bending portion 602 can be arranged to extend along a horizontal plane to ensure full contact between the bending portion 602 and the upper surface of the welding bottom plate 7.

[0062] Exemplarily, as Figure 3 shown, the structure of the pole 6 can be provided in an "I" shape.

[0063] In one embodiment, as Figure 3 shown, a welding groove 603 is formed on the upper surface of the pole 6, and the welding groove 603 is adapted to accommodate the bus bar.

[0064] By providing the welding groove 603 on the upper surface of the pole 6, due to the matching between the welding groove 603 and the bus bar, it can ensure that the bus bar can be accurately positioned during the assembly process, simplifies the assembly steps, and at the same time ensures a smoother connection between the bus bar and the pole 6, improves the appearance quality, and also improves the connection stability between the pole 6 and the bus bar.

[0065] Specifically, the welding groove 603 can be set in any existing shape such as a circular groove or a square groove. In the embodiments of the present application, the shape of the welding groove 603 is not specifically limited.

[0066] In one embodiment, as Figure 3 shown, a positioning groove 604 is further formed on the upper surface of the pole column 6. The positioning groove 604 is arranged within the welding groove 603 and is coaxially arranged with the pole column 6.

[0067] By providing the positioning groove 604 on the upper surface of the pole column 6, since the positioning groove 604 is coaxially arranged with the pole column 6, the axis of the pole column 6 can be ensured to be coaxially arranged with the axis of the through hole 403 by positioning the positioning groove 604, so that the position of the pole column 6 installed in the through hole 403 is accurate and the assembly error is reduced.

[0068] In one embodiment, as Figure 3 shown, the diameter of the convex portion 701 is smaller than the diameter of the mounting groove 601, and a chamfer 7012 is provided around the top of the outer wall of the convex portion 701.

[0069] By making the diameter of the convex portion 701 smaller than the diameter of the mounting groove 601, the convex portion 701 can be more easily inserted into the mounting groove 601, reducing the assembly error. Since the chamfer 7012 is provided at the top of the outer wall of the convex portion 701, during the process of inserting the convex portion 701 into the mounting groove 601, due to the chamfer 7012 contacting the bottom of the mounting groove 601, the convex portion 701 is more easily inserted into the mounting groove 601 through the guiding effect of the chamfer 7012, facilitating the installation of the welding bottom plate 7 and the pole column 6.

[0070] Specifically, the chamfer 7012 can be set as an inclined chamfer 7012 or an arc chamfer 7012. In the embodiments of the present application, the type of the chamfer 7012 is not specifically limited.

[0071] In one embodiment, as Figure 3 shown, the pole column 6 and the welding bottom plate 7 are both integrally formed.

[0072] Through the integrally formed design, the self-strength of the pole column 6 and the welding bottom plate 7 can be improved, which helps to reduce the production cost of the pole column 6 and the welding bottom plate 7 and improve the production efficiency.

[0073] In one embodiment, as Figure 3 shown, it further includes a first plastic part 8 and a second plastic part 9. Among them, the first plastic part 8 is arranged between the welding bottom plate 7 and the top wall 401, and the second plastic part 9 is arranged between the pole group 1 and the top wall 401.

[0074] By providing the first plastic part 8, the first plastic part 8 prevents the direct contact between the welding bottom plate 7 and the top wall 401, improves the insulation performance between the components inside the battery cell, and prevents short circuits or contacts between metal components.

[0075] By providing the second plastic part 9, the second plastic part 9 prevents the direct contact between the electrode assembly 1 and the top wall 401, improves the insulation performance between the components inside the battery cell, and prevents short circuits or contacts between metal components.

[0076] Specifically, the second plastic part 9 and the first plastic part 8 can be adaptively provided according to the specific structure of the battery cell. In the embodiments of the present application, the structures of the second plastic part 9 and the first plastic part 8 are not specifically limited.

[0077] In one embodiment, as Figure 3 shown, it further includes a sealing ring 10. The sealing ring 10 is sleeved on the pole post 6, and the sealing ring 10 is arranged between the electrode assembly 1 and the top wall 401.

[0078] By providing the sealing ring 10 between the pole post 6 and the top wall 401, the sealing performance of the battery cell is improved. At the same time, the displacement or damage of internal components caused by vibration or impact can be reduced, and the structural stability inside the battery cell is improved.

[0079] The installation process of the battery cell in this embodiment is described as follows:

[0080] The sealing ring 10 is sleeved on the pole post 6 and the pole post 6 is passed through the through hole 403. The second plastic part 9 is placed on the upper surface of the top wall 401, and the first plastic part 8 is placed between the lower surface of the top wall 401 and the welding bottom plate 7. The convex part 701 is inserted into the installation groove 601 and the top surface of the convex part 701 and the bottom surface of the installation groove 601 are welded, thus completing the connection between the pole post 6 and the welding bottom plate 7.

[0081] The electrode assembly 1 is loaded into the accommodation cavity from the opening at the bottom of the housing 4, so that the negative electrode tab 2 and the positive electrode tab 3 on the electrode assembly 1 pass through the through holes 402 on the first plastic part 8 and the top wall 401.

[0082] Then the negative electrode tab 2 and the positive electrode tab 3 are bent into an "L" shape, and then the negative electrode tab 2 and the positive electrode tab 3 are respectively welded to the corresponding welding bottom plate 7.

[0083] After the welding between the welding bottom plate 7 and the electrode tab is completed, the sealing plate 5 is covered at the through hole 402 and the accommodation cavity is sealed, thus completing the assembly of the battery cell.

[0084] According to an embodiment of the present invention, on the other hand, as Figures 1 to 8 shown, it further provides a battery pack, which includes a plurality of battery cells.

[0085] This battery pack includes the battery cells as described above and has all the beneficial technical effects of the battery cells, which will not be elaborated here.

[0086] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, Comprising: A pole group, with a negative pole tab and a positive pole tab provided at one end; A housing, provided with a receiving cavity, two through holes and two perforations are spaced apart along the length direction of the top wall of the housing, the two through holes are located between the two perforations, and the negative pole tab and the positive pole tab respectively pass through the two through holes; Pole columns, respectively inserted into the perforations one by one, and mounting grooves are provided on the lower surfaces of the pole columns; Welding bottom plates, respectively provided at the bottoms of the pole columns and located in the receiving cavity, protruding portions corresponding to the mounting grooves are provided on the upper surfaces of the welding bottom plates, and the welding bottom plates and the pole columns are connected by inserting the protruding portions into the mounting grooves and welding the top surfaces of the protruding portions to the groove bottom surfaces of the mounting grooves.

2. The battery cell according to claim 1, characterized in that, A welding groove coaxial with the protruding portion is provided on the lower surface of the protruding portion.

3. The battery cell according to claim 1, wherein A bent portion is provided at the bottom of the pole column, the bent portion extends in a direction away from the axis of the pole column, and the lower surface of the bent portion abuts against the upper surface of the welding bottom plate.

4. The battery cell according to claim 1, wherein, A welding groove adapted to accommodate a bus bar is provided on the upper surface of the pole column.

5. The battery cell according to claim 4, characterized in that, A positioning groove is further provided on the upper surface of the pole column, the positioning groove is located in the welding groove and is coaxial with the pole column.

6. The cell according to claim 1, characterized in that, The diameter of the protruding portion is smaller than the diameter of the mounting groove, and a chamfer is provided around the top of the outer wall of the protruding portion.

7. The battery cell according to any one of claims 1 to 6, characterized in that, The pole column and the welding bottom plate are respectively of an integrally formed structure.

8. The battery cell according to any one of claims 1 to 6, characterized in that, It further includes a first plastic part and a second plastic part, the first plastic part is provided between the welding bottom plate and the top wall, and the second plastic part is provided between the pole group and the top wall.

9. The battery cell according to any one of claims 1 to 6, characterized in that, It further includes a sealing ring, the sealing ring is sleeved on the pole column, and the sealing ring is provided between the pole group and the top wall.

10. A battery pack, characterized in that, Comprising: Multiple battery cells according to any one of claims 1 to 9.

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