Top cover assembly, single battery, and battery pack

Abstract

A top cover assembly, a single battery, and a battery pack. The top cover assembly comprises a current collecting disc (10), a plastic member (20), and a conductive terminal (30). The plastic member (20) is connected to the current collecting disc (10), and the plastic member (20) is configured with a through hole (210). The conductive terminal (30) is connected to the side of the plastic member (20) away from the current collecting disc (10). The conductive terminal (30) is configured with an abutting portion (310) extending in the direction of the current collecting disc (10). The abutting portion (310) passes through the through hole (210) and abuts against the current collecting disc (10).

Description

Top cover assembly, single battery and battery pack

[0001] The present application claims priority to the Chinese patent application No. 202421529722.1, filed on June 29, 2024, to the Chinese Patent Office, the whole content of the above application being incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery, in particular to a top cover assembly, a single battery and a battery pack. BACKGROUND

[0003] In the technical field of battery, it is often necessary to use a current collector to lead out the electric energy of the battery cell, and to melt when the current is too large, thereby ensuring the safety of the battery.

[0004] In the related art, the current collector of a cylindrical battery is usually in a "Z" shaped bending structure, so as to facilitate the assembly of the current collector. SUMMARY

[0005] However, the "Z" shaped bending structure increases the length of the current collector, resulting in increased resistance and reduced performance of the battery cell.

[0006] The present application provides a top cover assembly. The top cover assembly comprises a current collector, a plastic part and a conductive terminal. The plastic part is connected with the current collector. The plastic part is configured with a through hole. The conductive terminal is connected with the plastic part. The conductive terminal is configured with an abutting portion extending towards the current collector. The abutting portion is arranged in the through hole and abuts against the current collector.

[0007] The present application also provides a single battery. The single battery comprises a temperature sensor and the above-mentioned top cover assembly.

[0008] The present application also provides a battery pack. The battery pack comprises a plurality of battery modules. Each battery module comprises a plurality of single batteries as described above. ADVANTAGEOUS EFFECTS

[0009] The top cover assembly provided by the present application connects the conductive terminal and the current collector through the plastic part, and directly electrically connects the abutting portion of the conductive terminal and the current collector, so that the current collector does not need to be bent in a "Z" shape, the length of the current collector can be shortened, the resistance of the current collector can be reduced, and the performance of the battery cell can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0010] Fig. 1 is a perspective view of the top cover assembly provided by the present application.

[0011] Fig. 2 is an exploded view of the top cover assembly provided by the present application.

[0012] Fig. 3 is a sectional view of the top cover assembly provided by the present application.

[0013] Fig. 4 is a structural schematic diagram of a plastic part according to an embodiment of the present application.

[0014] Fig. 5 is a structural schematic diagram of a plastic part according to an embodiment of the present application.

[0015] Fig. 6 is a structural schematic diagram of a conductive terminal according to an embodiment of the present application.

[0016] Fig. 7 is a structural schematic diagram of a connecting piece according to an embodiment of the present application.

[0017] Fig. 8 is a structural schematic diagram of a cover plate according to an embodiment of the present application.

[0018] Legend of reference signs:

[0019] 10, current collector plate; 110, outer protrusion; 20, plastic part; 210, through hole; 220, main body portion; 230, annular portion; 240, connecting portion; 250, accommodation passage; 260, first groove; 2610, first groove segment; 2620, second groove segment; 270, second groove; 280, shielding portion; 2810, liquid injection hole; 290, annular groove; 30, conductive terminal; 310, abutting portion; 40, sealing member; 50, first rotation-stopping member; 60, rotation-stopping hole; 70, connecting piece; 710, first lapping portion; 80, cover plate; 810, second lapping portion; 90, rotation-stopping notch. Embodiments of the present application

[0020] Please refer to Figs. 1-8, an embodiment of the present application provides a top cover assembly. The top cover assembly comprises a current collector plate 10, a plastic part 20 and a conductive terminal 30. The plastic part 20 is connected with the current collector plate 10, and the plastic part 20 is configured with a through hole 210. The conductive terminal 30 is connected with the plastic part 20, and the conductive terminal 30 is configured with an abutting portion 310 extending towards the current collector plate 10, the abutting portion 310 is arranged in the through hole 210 and abuts against the current collector plate 10.

[0021] In some embodiments, the plastic part 20 connects the conductive terminal 30 and the current collector plate 10, and the abutting portion 310 of the conductive terminal 30 is directly electrically connected with the current collector plate 10, so that the current collector plate 10 does not need to be bent in a "Z" shape, the length of the current collector plate 10 can be shortened, the resistance of the current collector plate 10 can be reduced, and the performance of the battery cell can be improved.

[0022] It can be understood that the plastic part 20 is an integrally injection molded component. Moreover, when the plastic part 20 is injection molded, the conductive terminal 30 has been placed in the mold of the injection molding machine, so that the conductive terminal 30 and the plastic part 20 can be integrally injection molded to form a whole structure. At the same time, based on the abutting portion 310 of the conductive terminal 30, the top cover assembly formed by the integrally injection molded part and the conductive terminal 30 can also cancel the distinction between the positive post, the upper plastic and the lower plastic, and facilitate subsequent overall assembly.

[0023] As shown in FIG. 3, the abutting portion 310 is integrally formed on the conductive terminal 30. After the abutting portion 310 abuts against the current collector 10, an electrical connection can be directly formed. To ensure the stability of the connection between the abutting portion 310 and the current collector 10, welding can be performed between the abutting portion 310 and the current collector 10. For example, the current collector 10 and the abutting portion 310 can be welded by penetration welding on the side of the current collector 10 away from the abutting portion 310, to ensure the stable connection between the current collector 10 and the abutting portion 310.

[0024] In the embodiment, the abutting portion 310 of the conductive terminal 30 abuts against the current collector 10 after passing through the through hole 210 of the plastic member 20, so that the conductive terminal 30 and the current collector 10 are located on opposite sides of the plastic member 20. It can be seen that the conductive terminal 30 is connected to the side of the plastic member 20 away from the current collector 10.

[0025] The top cover assembly in the embodiment is particularly suitable for cylindrical batteries. The conductive terminal 30 can be cylindrical, the abutting portion 310 can also be cylindrical, the through hole 210 on the plastic member 20 is a circular hole, and the current collector 10 is a circular structure. The diameter of the abutting portion 310 is smaller than the diameter of the conductive terminal 30.

[0026] As shown in FIG. 4 and FIG. 5, in some embodiments, the plastic member 20 includes a main body portion 220, an annular portion 230, and a connecting portion 240. The through hole 210 is configured on the main body portion 220. The annular portion 230 is annularly arranged on the outside of the main body portion 220 and is spaced apart from the main body portion 220. The connecting portion 240 is connected between the main body portion 220 and the annular portion 230. The connecting portion 240 is provided in a plurality of connecting portions 240, and the plurality of connecting portions 240 are spaced apart along the circumferential direction of the main body portion 220. The main body portion 220, the annular portion 230, and each adjacent two connecting portions 240 form a clearance channel 250.

[0027] The clearance channel 250 formed between the main body portion 220, the annular portion 230, and the connecting portion 240 can be configured as a welding tab. The clearance channel 250 is configured to weld the tab to the current collector 10 at the position of the clearance channel 250.

[0028] The main body portion 220, the annular portion 230, and the connecting portion 240 are integrally injection molded.

[0029] The main body portion 220 can be cylindrical, the annular portion 230 is a circular ring portion 230 arranged on the outside of the main body portion 220, and the connecting portion 240 is a square column. Each connecting portion 240 is arranged along the radial direction of the main body portion 220 and the annular portion 230.

[0030] For example, if the number of connection portions 240 is set to 8, 8 accommodation channels 250 configured as welding tabs can be formed on the plastic member 20.

[0031] As shown in FIG. 5, in some embodiments, the body portion 220 is configured with a first stepped groove 260 on one side of the current collector plate 10. The first stepped groove 260 includes a first groove segment 2610 and a second groove segment 2620 that are in communication with each other, and the first groove segment 2610 is in communication with the through hole 210. The hole diameter of the through hole 210, the first groove segment 2610 and the second groove segment 2620 increases in sequence. The first groove segment 2610 is provided with a sealing member 40, and the sealing member 40 is sleeved on the abutting portion 310. As shown in FIGS. 2 and 3, the current collector plate 10 is configured with an outer protrusion 110 extending towards the body portion 220, the outer protrusion 110 is arranged in the second groove segment 2620, and the outer protrusion 110 abuts against the abutting portion 310.

[0032] Based on the configuration of the sealing member 40 in the first groove segment 2610 of the first stepped groove 260, the sealing member 40 is sleeved on the abutting portion 310, thereby achieving sealed connection between the conductive terminal 30, the plastic member 20 and the current collector plate 10, and preventing leakage of electrolyte from the connection between the conductive terminal 30 and the plastic member 20.

[0033] The sealing member 40 is a circular sealing ring. The sealing member 40 can be made of rubber or other materials to be clamped in the first groove segment 2610 and sleeved on the abutting portion 310, thereby achieving the sealing effect.

[0034] Based on the configuration of the outer protrusion 110 extending towards the body portion 220 on the current collector plate 10, the outer protrusion 110 is clamped in the second groove segment 2620 of the first stepped groove 260, thereby facilitating the positioning and installation between the current collector plate 10 and the body portion 220, and preventing horizontal misalignment between the current collector plate 10 and the body portion 220, which causes inaccurate welding position of the abutting portion 310.

[0035] The outer protrusion 110 is arranged at the middle portion of the current collector plate 10. The outer protrusion 110 is circular and has the same center as the current collector plate 10. The size of the outer protrusion 110 is adapted to the size of the second groove segment 2620, so that the outer protrusion 110 can be clamped in the second groove segment 2620. Specifically, the diameter of the outer protrusion 110 is the same as the hole diameter of the second groove segment 2620, and the protruding height of the outer protrusion 110 is the same as the hole thickness of the second groove segment 2620.

[0036] In some embodiments, the hole diameter of the through hole 210, the first slot section 2610 and the second slot section 2620 increases. For example, the hole diameter of the through hole 210 is 3 mm, the hole diameter of the first slot section 2610 is 4 mm, and the hole diameter of the second slot section 2620 is 6 mm. For example, the hole diameter of the through hole 210 is 5 mm, the hole diameter of the first slot section 2610 is 6 mm, and the hole diameter of the second slot section 2620 is 9 mm.

[0037] As shown in FIG. 4 and FIG. 6, in some embodiments, the second groove 270 is configured on the side of the main body 220 facing the conductive terminal 30, the second groove 270 is in communication with the through hole 210, one of the second groove 270 and the conductive terminal 30 is configured with the first rotation stopping piece 50, and the other is configured with the rotation stopping hole 60, the conductive terminal 30 is installed in the second groove 270, and the rotation stopping hole 60 is clamped with the first rotation stopping piece 50.

[0038] Based on the second groove 270 configured on the side of the main body 220 facing the conductive terminal 30, the conductive terminal 30 can be clamped through the second groove 270. The second groove 270 is a circular groove, and the diameter of the second groove 270 is greater than the hole diameter of the through hole 210. The through hole 210 is in communication with the groove bottom surface of the second groove 270.

[0039] Based on the second groove 270, the conductive terminal 30 can be directly injection molded and connected to the plastic part 20 during the injection molding process of the plastic part 20, facilitating the assembly between the conductive terminal 30 and the plastic part 20. When the conductive terminal 30 is installed in the second groove 270, the first rotation stopping piece 50 is clamped in the rotation stopping hole 60, thereby preventing relative rotation between the conductive terminal 30 and the plastic part 20.

[0040] In some embodiments, the rotation stopping hole 60 is provided on the side of the conductive terminal 30 facing the main body 220, and the first rotation stopping piece 50 is provided on the groove bottom surface of the second groove 270. Specifically, the rotation stopping hole 60 can be a circular hole provided on the side of the conductive terminal 30 facing the main body 220. The first rotation stopping piece 50 can be a circular column provided on the groove bottom surface of the second groove 270. The circular hole can be provided in two, and the two circular holes are symmetrically provided on both sides of the abutting portion 310. Correspondingly, two first rotation stopping pieces 50 are also provided on the groove bottom surface of the second groove 270, and the two first rotation stopping pieces 50 are symmetrically provided on both sides of the through hole 210. Of course, the number of circular holes can also be three, four or more, and the plurality of circular holes can be centrally symmetrically arranged along the center of the abutting portion 310. Correspondingly, the number of first rotation stopping pieces 50 is also set to be multiple, and the plurality of first rotation stopping pieces 50 are centrally symmetrically arranged along the center of the through hole 210.

[0041] In some embodiments, the rotation stopping hole 60 is arranged on the groove bottom surface of the second groove 270, and the first rotation stopping piece 50 is arranged on the side of the conductive terminal 30 facing the main body part 220. Specifically, the rotation stopping hole 60 can be a circular hole arranged on the groove bottom surface of the second groove 270. The first rotation stopping piece 50 can be a circular column arranged on the side of the conductive terminal 30 facing the main body part 220. Among them, the circular hole can be arranged as two, and the two circular holes are symmetrically arranged on both sides of the through hole 210. Correspondingly, the side of the conductive terminal 30 facing the main body part 220 is also provided with two first rotation stopping pieces 50, and the two first rotation stopping pieces 50 are symmetrically arranged on both sides of the abutting part 310. Of course, the number of circular holes can also be arranged as three, four or more, so that the plurality of circular holes are arranged in central symmetry along the center of the through hole 210. Correspondingly, the number of first rotation stopping pieces 50 is also arranged as a plurality, and the plurality of first rotation stopping pieces 50 are arranged in central symmetry along the center of the abutting part 310.

[0042] As shown in FIG. 4 and FIG. 5, in some embodiments, the plastic part 20 further includes a shielding part 280. The shielding part 280 is formed with a liquid injection hole 2810. Among them, the shielding part 280 is connected between two adjacent connecting parts 240.

[0043] Based on the shielding part 280 constructed on one of the accommodation channels 250, the liquid injection hole 2810 can be formed on the shielding part 280, so that the electrolyte is added into the single battery through the liquid injection hole 2810.

[0044] For example, the number of connecting parts 240 is arranged as 8, and 8 accommodation channels 250 can be formed on the plastic part 20. The shielding part 280 is constructed on one of the accommodation channels 250, and the liquid injection hole 2810 is formed on the shielding part 280. Thus, 7 accommodation channels 250 configured to weld the tab and one shielding part 280 configured to inject electrolyte can be formed on the plastic part 20.

[0045] In some embodiments, the shielding part 280 can be integrally injection molded on the main body part 220, the annular part 230 and the two adjacent connecting parts 240. Then, the two sides of the shielding part 280 are respectively connected to a connecting part 240.

[0046] In some embodiments, the shielding portion 280 can also be integrally injection molded between the main body portion 220 and the annular portion 230. Then, two sides of the shielding portion 280 are respectively spaced apart from a connecting portion 240. For example, a shielding portion 280 can be configured between the main body portion 220 and the annular portion 230, and six connecting portions 240 can be configured between the main body portion 220 and the annular portion 230, and the connecting portions 240 are spaced apart from the shielding portion 280. At this time, seven accommodation channels 250 configured as welding tabs and one shielding portion 280 configured as electrolyte injection can be formed on the plastic part 20.

[0047] The electrolyte injection hole 2810 on the shielding portion 280 is configured to communicate with the electrolyte injection hole on the cover plate 80 to achieve the injection of electrolyte into the single battery cell.

[0048] As shown in FIG. 2, in some embodiments, the top cover assembly further includes a connecting piece 70 and a cover plate 80. The connecting piece 70 is sleeved on the main body portion 220. As shown in FIG. 7, the connecting piece 70 is configured with a first lap portion 710 on the side. The cover plate 80 is annular and annularly arranged on the connecting piece 70. As shown in FIG. 8, the inner ring of the cover plate 80 is connected with a second lap portion 810, and the upper surface of the second lap portion 810 is lower than the upper surface of the cover plate 80. The second lap portion 810 is lapped on the first lap portion 710, and the second lap portion 810 is welded with the first lap portion 710.

[0049] A complete top cover assembly is formed by the cover plate 80. The connecting piece 70 is configured to connect the cover plate 80. Specifically, the cover plate 80 is circular ring shape, and the connecting piece 70 is also circular ring shape. The connecting piece 70 is sleeved on the main body portion 220. The outer ring of the connecting piece 70 forms the first lap portion 710, and the inner ring of the cover plate 80 forms the second lap portion 810. The second lap portion 810 is lapped on the upper side of the first lap portion 710, and then the first lap portion 710 and the second lap portion 810 are fixedly connected by welding.

[0050] Based on the height difference between the upper surface of the second lap portion 810 and the upper surface of the cover plate 80. When the second lap portion 810 is lapped on the first lap portion 710, the welding device can weld the first lap portion 710 and the second lap portion 810 on the upper surface of the second lap portion 810 to achieve the welding connection of the two. It can be understood that during the welding of the first lap portion 710 and the second lap portion 810, the upper surface of the second lap portion 810 will be raised based on the accumulation or molten expansion of the solder. Since the height of the upper surface of the second lap portion 810 is lower than the height of the upper surface of the cover plate 80, the upper surface of the second lap portion 810 can be basically leveled with the upper surface of the cover plate 80 after the welding of the first lap portion 710 and the second lap portion 810 based on the height difference itself, so as to keep the appearance of the top cover assembly.

[0051] In order to ensure that the cover plate 80 and the connecting piece 70 can be welded, the connecting piece 70 and the cover plate 80 are both made of metal material.

[0052] Please continue to refer to FIG. 4 and FIG. 5, in some embodiments, the outer surface of the body part 220 is configured with an annular groove 290, one of the annular groove 290 and the connecting piece 70 is configured with a second rotation stopping piece, and the other is configured with a rotation stopping notch 90. Wherein, at least part of the connecting piece 70 is clamped in the annular groove 290, and the second rotation stopping piece is clamped with the rotation stopping notch 90.

[0053] It can be understood that the annular groove 290 extends along the circumference of the body part 220. Based on the structure of the connecting piece 70 being a circular ring, after the connecting piece 70 is sleeved in the annular groove 290, in order to prevent the relative rotation between the connecting piece 70 and the body part 220 from causing the liquid injection hole 2810 of the cover plate 80 and the liquid injection hole 2810 of the shielding part 280 to be misaligned. Then the cooperation of the second rotation stopping piece and the rotation stopping notch 90 can realize the mutual positioning between the connecting piece 70 and the body part 220. Thus, the rotation of the connecting piece 70 and the body part 220 is prevented, which causes the liquid injection hole 2810 of the cover plate 80 and the liquid injection hole 2810 of the shielding part 280 to be misaligned.

[0054] In some embodiments, the annular groove 290 is provided with a second rotation stopping piece, and the inner ring of the connecting piece 70 is formed with a rotation stopping notch 90. When the inner ring of the connecting piece 70 is clamped in the annular groove 290, the rotation stopping notch 90 is clamped with the second rotation stopping piece. Thus, the mutual positioning between the connecting piece 70 and the body part 220 is realized, and the rotation of the connecting piece 70 and the body part 220 is prevented, which causes the liquid injection hole 2810 of the cover plate 80 and the liquid injection hole 2810 of the shielding part 280 to be misaligned.

[0055] Wherein, the number of the second rotation stopping piece can be set to be multiple, and the multiple second rotation stopping pieces are arranged on the groove bottom surface of the annular groove 290 along the circumference of the annular groove 290. Correspondingly, the number of the rotation stopping notch 90 is also set to be multiple, and the multiple rotation stopping notches 90 are arranged along the circumference of the inner ring of the connecting piece 70. Wherein, each rotation stopping notch 90 is clamped with a second rotation stopping piece.

[0056] In some embodiments, the annular groove 290 is provided with a rotation stopping notch 90, and the inner ring of the connecting piece 70 is formed with a second rotation stopping piece. When the inner ring of the connecting piece 70 is clamped in the annular groove 290, the rotation stopping notch 90 is clamped with the second rotation stopping piece. Thus, the mutual positioning between the connecting piece 70 and the body part 220 is realized, and the rotation of the connecting piece 70 and the body part 220 is prevented, which causes the liquid injection hole 2810 of the cover plate 80 and the liquid injection hole 2810 of the shielding part 280 to be misaligned.

[0057] The second rotation-stopping pieces can be provided in a plurality of numbers, and the plurality of second rotation-stopping pieces are arranged at intervals in the circumferential direction of the inner ring of the connecting piece 70. Correspondingly, the rotation-stopping notches 90 are also provided in a plurality of numbers, and the plurality of rotation-stopping notches 90 are arranged at intervals in the circumferential direction of the annular groove 290 on the groove bottom surface of the annular groove 290. Each rotation-stopping notch 90 is clamped with a second rotation-stopping piece.

[0058] In some embodiments, the conductive terminal 30, the plastic piece 20 and the connecting piece 70 are injection-molded.

[0059] Based on the injection-molding of the conductive terminal 30, the plastic piece 20 and the connecting piece 70, the conductive terminal 30 and the connecting piece 70 are placed in the mold of the injection-molding machine when the plastic piece 20 is injection-molded. Thus, the conductive terminal 30, the plastic piece 20 and the connecting piece 70 form an integrated structure after the plastic piece 20 is injection-molded. Therefore, the top cover assembly formed by the integrated injection-molded piece, the conductive terminal 30 and the connecting piece 70 can also cancel the distinction between the positive column, the upper plastic and the lower plastic, facilitating subsequent integrated assembly.

[0060] The embodiments of the present application also provide a single battery. The single battery comprises a top cover assembly.

[0061] In some embodiments, the plastic piece 20 connects the conductive terminal 30 and the current collecting disc 10, and the abutting portion 310 of the conductive terminal 30 is directly electrically connected with the current collecting disc 10, so that the current collecting disc 10 does not need to be bent in a "Z" shape, the length of the current collecting disc 10 can be shortened, the resistance of the current collecting disc 10 can be reduced, and the performance of the battery cell can be improved.

[0062] The single battery particularly comprises a cylindrical battery.

[0063] The embodiments of the present application also provide a battery pack. The battery pack comprises a plurality of battery modules, and each battery module comprises a plurality of single batteries.

[0064] In some embodiments, the plastic piece 20 connects the conductive terminal 30 and the current collecting disc 10, and the abutting portion 310 of the conductive terminal 30 is directly electrically connected with the current collecting disc 10, so that the current collecting disc 10 does not need to be bent in a "Z" shape, the length of the current collecting disc 10 can be shortened, the resistance of the current collecting disc 10 can be reduced, and the performance of the battery cell can be improved.

Claims

1. A top cover assembly, comprising: Collector disk; A plastic part, connected to the manifold, the plastic part having through holes; A conductive terminal is connected to the plastic part. The conductive terminal is configured with an abutting portion extending toward the manifold. The abutting portion passes through the through hole and abuts against the manifold.

2. The top cover assembly according to claim 1, wherein, The plastic part includes: The main body portion, wherein the through hole is formed in the main body portion; An annular portion is disposed around the outside of the main body portion and spaced apart from the main body portion; A connecting portion is provided between the main body portion and the annular portion. Multiple connecting portions are provided, and the multiple connecting portions are spaced apart along the circumference of the main body portion. The main body, the annular portion, and each pair of adjacent connecting portions form a clearance channel.

3. The top cover assembly according to claim 2, wherein, The main body has a stepped first groove on the side facing the collector plate. The first groove includes a first groove segment and a second groove segment that are interconnected. The first groove segment is connected to the through hole. The diameters of the through hole, the first groove segment, and the second groove segment increase progressively. A sealing element is provided in the first groove segment. The sealing element is sleeved on the abutment portion. The collector plate has an outwardly protruding portion that extends toward the main body. The outwardly protruding portion is located in the second groove segment and abuts against the abutment portion.

4. The top cover assembly according to claim 2 or 3, wherein, The main body has a second groove on the side facing the conductive terminal. The second groove communicates with the through hole. One of the second groove and the conductive terminal has a first anti-rotation member, and the other has an anti-rotation hole. The conductive terminal is installed in the second groove, and the anti-rotation hole engages with the first anti-rotation member.

5. The top cover assembly according to any one of claims 2-4, wherein, The plastic part also includes a shielding portion, on which an injection hole is formed, wherein the shielding portion is connected between two adjacent connecting portions.

6. The top cover assembly according to any one of claims 2-5, wherein, The top cover assembly also includes: A connector is fitted onto the main body, and the connector has a first overlapping portion on its periphery; A cover plate is configured as annular and is disposed around the connector. The inner ring of the cover plate is connected to a second overlapping portion. The upper surface of the second overlapping portion is lower than the upper surface of the cover plate. The second overlapping portion overlaps the first overlapping portion and is welded to the first overlapping portion.

7. The top cover assembly according to claim 6, wherein, The outer surface of the main body is provided with an annular groove. One of the annular groove and the connector is provided with a second anti-rotation member, and the other is provided with an anti-rotation notch. At least a portion of the connector is engaged in the annular groove, and the second anti-rotation member is engaged with the anti-rotation notch.

8. The top cover assembly according to claim 6 or 7, wherein, The conductive terminal, the plastic part, and the connector are injection molded together.

9. A single battery cell, comprising a top cover assembly as described in any one of claims 1-8.

10. A battery pack comprising a plurality of battery modules, each of the battery modules comprising a plurality of individual batteries as described in claim 9.

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