Top cover assembly, single battery and battery pack

Abstract

The utility model relates to the technical field of batteries, and provides a top cover assembly, a single battery and a battery pack. The top cover assembly comprises a collector plate, a plastic part and a conductive terminal. The plastic part is connected with the collector plate and provided with a through hole. The conductive terminal is connected with one side, far away from the current collecting plate, of the plastic part, the conductive terminal is provided with an abutting part extending towards the current collecting plate, and the abutting part penetrates through the through hole and abuts against the current collecting plate. Therefore, the conductive terminal and the current collecting plate are connected through the plastic part, and the abutting part of the conductive terminal is directly and electrically connected with the current collecting plate, so that the current collecting plate does not need to be bent in a Z shape, the length of the current collecting plate can be shortened, the resistance of the current collecting plate is reduced, and the performance of the battery cell is improved.

Description

Technical Field

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

[0002] In the related art, the current collector of a cylindrical battery is usually a "Z"-shaped bending structure to facilitate the assembly of the current collector. However, the "Z"-shaped bending structure increases the length of the current collector, resulting in increased resistance and reduced performance of the battery cell. Utility Model Content

[0003] The embodiments of the utility model provide a top cover assembly, a single cell and a battery pack, which can improve the technical problem that the current collecting plate has a large resistance due to the "Z"-shaped bending structure.

[0004] In a first aspect, an embodiment of the utility model provides a top cover assembly, comprising:

[0005] Collector plate;

[0006] A plastic part connected to the current collecting plate, wherein the plastic part is provided with a through hole;

[0007] A conductive terminal is connected to the plastic part, and the conductive terminal is configured with an abutment portion extending toward the current collecting disk. The abutment portion passes through the through hole and abuts against the current collecting disk.

[0008] In one embodiment, the plastic part includes:

[0009] a main body, wherein the through hole is configured in the main body;

[0010] An annular portion, arranged on the outside of the main body portion and spaced apart from the main body portion;

[0011] A connecting portion connected between the main body and the annular portion, wherein at least two connecting portions are provided, and at least two connecting portions are spaced apart along the circumference of the main body;

[0012] Wherein, the main body, the annular portion and each two adjacent connecting portions enclose a clearance channel.

[0013] In one embodiment, a first stepped groove is constructed on one side of the main body toward the collecting plate, the first groove includes a first groove section and a second groove section that are interconnected, the first groove section is connected to the through hole, wherein the apertures of the through hole, the first groove section and the second groove section are gradually increased, a sealing member is provided in the first groove section, the sealing member is sleeved on the abutting portion, the collecting plate is constructed with an outer protrusion extending toward the main body, the outer protrusion is provided in the second groove section, and abuts against the abutting portion.

[0014] In one embodiment, a second groove is formed on one side of the main body portion facing the conductive terminal, and the second groove communicates with the through hole. Among them, one of the second groove and the conductive terminal is provided with a first anti-rotation member, and the other is provided with an anti-rotation hole. The conductive terminal is installed in the second groove, and the anti-rotation hole is engaged with the first anti-rotation member.

[0015] In one embodiment, the plastic part further includes a shielding portion, and a liquid injection hole is formed on the shielding portion. Among them, the shielding portion is connected between two adjacent connecting portions.

[0016] In one embodiment, the top cover assembly further includes:

[0017] A connecting member sleeved on the main body portion, and a first overlapping portion is formed on the circumferential side of the connecting member;

[0018] A cover plate, which is arranged in a ring shape and is disposed around the connecting member. The inner ring of the cover plate is connected with a second overlapping portion, and the upper surface of the second overlapping portion is lower than the upper surface of the cover plate. Among them, the second overlapping portion overlaps on the first overlapping portion, and the second overlapping portion is welded to the first overlapping portion.

[0019] In one embodiment, a ring groove is formed on the outer surface of the circumferential side of the main body portion. One of the ring groove and the connecting member is provided with a second anti-rotation member, and the other is provided with an anti-rotation notch. Among them, at least a part of the connecting member is engaged in the ring groove, and the second anti-rotation member is engaged with the anti-rotation notch.

[0020] In one embodiment, the conductive terminal, the plastic part and the connecting member are injection-molded and connected.

[0021] In a second aspect, an embodiment of the present invention provides a single cell, including the top cover assembly as described above.

[0022] In a third aspect, an embodiment of the present invention provides a battery pack, including a plurality of battery modules, and each of the battery modules includes a plurality of the single cells as described above.

[0023] Advantageous effects of the embodiments of the present invention:

[0024] In the embodiments of the present invention, the conductive terminal and the current collector are connected by the plastic part, and the abutting portion of the conductive terminal is directly electrically connected to 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 core can be improved. Description of the Drawings

[0025] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 is a three-dimensional schematic diagram of a top cover assembly provided by an embodiment of the present utility model;

[0027] Figure 2 is an exploded view of a top cover assembly provided by an embodiment of the present utility model;

[0028] Figure 3 is a cross-sectional view of a top cover assembly provided by an embodiment of the present utility model;

[0029] Figure 4 is one of the structural schematic diagrams of a plastic part provided by an embodiment of the present utility model;

[0030] Figure 5 is another structural schematic diagram of a plastic part provided by an embodiment of the present utility model;

[0031] Figure 6 is a structural schematic diagram of a conductive terminal provided by an embodiment of the present utility model;

[0032] Figure 7 is a structural schematic diagram of a connecting piece provided by an embodiment of the present utility model;

[0033] Figure 8 is a structural schematic diagram of a cover plate provided by an embodiment of the present utility model.

[0034] Reference numerals:

[0035] 10 - current collecting plate, 110 - convex part, 20 - plastic part, 210 - through hole, 220 - main body part, 230 - annular part, 240 - connecting part, 250 - relief channel, 260 - first groove, 2610 - first groove section, 2620 - second groove section, 270 - second groove, 280 - shielding part, 2810 - liquid injection hole, 290 - annular groove, 30 - conductive terminal, 310 - abutting part, 40 - seal, 50 - first anti-rotation part, 60 - anti-rotation hole, 70 - connecting piece, 710 - first overlapping part, 80 - cover plate, 810 - second overlapping part, 90 - anti-rotation notch. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts belong to the protection scope of the present utility model. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model. In the present utility model, unless otherwise stated, the orientation words such as "upper" and "lower" usually refer to the upper and lower in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0037] Please refer to Figures 1 to 8 , an embodiment of the present utility model provides a top cover assembly. The top cover assembly includes a current collector plate 10, a plastic part 20, and a conductive terminal 30. The plastic part 20 is connected to the current collector plate 10, and the plastic part 20 is configured with a through hole 210. The conductive terminal 30 is connected to the plastic part 20, and the conductive terminal 30 is configured with an abutting portion 310 extending in the direction of the current collector plate 10. The abutting portion 310 passes through the through hole 210 and abuts against the current collector plate 10.

[0038] In some embodiments, the conductive terminal 30 and the current collector plate 10 are connected through the plastic part 20, and the abutting portion 310 of the conductive terminal 30 is directly electrically connected to the current collector plate 10, so that the current collector plate 10 does not need to be bent in a "Z" shape, which can shorten the length of the current collector plate 10, reduce the resistance of the current collector plate 10, and improve the performance of the battery cell.

[0039] It can be understood that the plastic part 20 is a part formed by integral injection molding. And when the plastic part 20 is injection molded, the conductive terminal 30 has been placed in the mold of the injection molding machine. Thus, the conductive terminal 30 and the plastic part 20 can be integrally injection molded to form an integral structure. At the same time, based on the abutting portion 310 of the conductive terminal 30, the top cover assembly formed by the integral injection molded part and the conductive terminal 30 can also eliminate the difference between the pole post, the upper plastic, and the lower plastic, which is convenient for subsequent integral assembly.

[0040] As Figure 3 shown, the abutting portion 310 is integrally formed on the conductive terminal 30. After the abutting portion 310 abuts against the current collector plate 10, an electrical connection can be directly formed. To ensure the stability of the connection between the abutting portion 310 and the current collector plate 10, welding can also be performed between the abutting portion 310 and the current collector plate 10. For example, the current collector plate 10 and the abutting portion 310 can be welded by penetration welding on the side of the current collector plate 10 away from the abutting portion 310 to ensure the stable connection between the current collector plate 10 and the abutting portion 310.

[0041] The contact portion 310 of the conductive terminal 30 passes through the through hole 210 of the plastic part 20 and then contacts the collecting plate 10, so the conductive terminal 30 and the collecting plate 10 are respectively located on opposite sides of the plastic part 20. It can be seen that the conductive terminal 30 is connected to the side of the plastic part 20 away from the collecting plate 10.

[0042] The top cover assembly in the embodiment of the utility model is particularly suitable for cylindrical batteries. The conductive terminal 30 can be set to a cylindrical shape, the abutment portion 310 can also be set to a cylindrical shape, the through hole 210 on the plastic part 20 is a circular hole, and the current collecting plate 10 is a circular structure. Among them, the diameter of the abutment portion 310 is smaller than the diameter of the conductive terminal 30.

[0043] like Figure 4 and Figure 5 As shown, in some embodiments, the plastic part 20 includes a main body 220, an annular portion 230 and a connecting portion 240. The through hole 210 is configured in the main body 220. The annular portion 230 is disposed around the outside of the main body 220 and is spaced apart from the main body 220. The connecting portion 240 is connected between the main body 220 and the annular portion 230, and at least two connecting portions 240 are provided, and at least two connecting portions 240 are spaced apart along the circumference of the main body 220. The main body 220, the annular portion 230 and each adjacent two connecting portions 240 enclose a clearance channel 250.

[0044] The clearance channel 250 formed by the main body 220 , the annular portion 230 and the connecting portion 240 can be used for welding the electrode tab, and for welding the electrode tab to the current collecting plate 10 at the position of the clearance channel 250 .

[0045] The main body 220 , the annular portion 230 and the connecting portion 240 are integrally injection molded structures.

[0046] The main body 220 can be set to a cylindrical shape, and the annular portion 230 is a circular annular portion 230 piece arranged outside the main body 220 with a spacer ring. The connecting portion 240 is a square column. Each connecting portion 240 is arranged along the radial direction of the main body 220 and the annular portion 230.

[0047] For example, if the number of the connecting parts 240 is set to 8, then 8 clearance channels 250 can be formed on the plastic part 20, thereby forming 8 clearance channels 250 for welding the tabs.

[0048] like Figure 5As shown, in some embodiments, a stepped first groove 260 is formed on one side of the main body portion 220 facing the current collector plate 10. The first groove 260 includes a first groove section 2610 and a second groove section 2620 that communicate with each other, and the first groove section 2610 communicates with the through hole 210. Among them, the diameters of the through hole 210, the first groove section 2610, and the second groove section 2620 increase. A seal 40 is provided in the first groove section 2610, and the seal 40 is sleeved on the abutting portion 310. As Figure 2 and Figure 3 shown, the current collector plate 10 is formed with an outward convex portion 110 extending in the direction of the main body portion 220. The outward convex portion 110 is disposed in the second groove section 2620 and abuts against the abutting portion 310.

[0049] By constructing the seal 40 in the first groove section 2610 of the stepped first groove 260 and sleeving the seal 40 on the abutting portion 310, a sealed connection between the conductive terminal 30, the plastic part 20, and the current collector plate 10 is achieved, preventing the electrolyte from leaking from the connection between the conductive terminal 30 and the plastic part 20.

[0050] Among them, the seal 40 is an annular sealing ring. The seal 40 can be made of materials such as rubber to snap the seal 40 into the first groove section 2610 and sleeve the seal 40 on the abutting portion 310, thereby achieving a sealing effect.

[0051] By constructing the outward convex portion 110 extending in the direction of the main body portion 220 on the current collector plate 10 and snapping the outward convex portion 110 into the second groove section 2620 of the stepped first groove 260, thus facilitating the positioning and installation between the current collector plate 10 and the main body portion 220 and preventing horizontal misalignment between the current collector plate 10 and the main body portion 220, which may cause inaccurate welding positions of the abutting portion 310.

[0052] Among them, the outward convex portion 110 is disposed in the middle of the current collector plate 10. The outward convex portion 110 is circular and concentric with the current collector plate 10. The size of the outward convex portion 110 is adapted to the size of the second groove section 2620 so that the outward convex portion 110 can just be snapped into the second groove section 2620. Specifically, the diameter of the outward convex portion 110 is the same as the diameter of the second groove section 2620, and the protruding height of the outward convex portion 110 is the same as the hole thickness of the second groove section 2620.

[0053] In some embodiments, the diameters of the through hole 210, the first groove section 2610, and the second groove section 2620 increase. For example, the diameter of the through hole 210 is 3 mm, the diameter of the first groove section 2610 is 4 mm, and the diameter of the second groove section 2620 is 6 mm. For example, the diameter of the through hole 210 is 5 mm, the diameter of the first groove section 2610 is 6 mm, and the diameter of the second groove section 2620 is 9 mm.

[0054] AsFigure 4 and Figure 6 As shown in Figure 4 and Figure 6 , in some embodiments, a second groove 270 is formed on one side of the main body portion 220 facing the conductive terminal 30. The second groove 270 communicates with the through hole 210. Among them, a first anti-rotation member 50 is formed on one of the second groove 270 and the conductive terminal 30, and an anti-rotation hole 60 is formed on the other. The conductive terminal 30 is installed in the second groove 270, and the anti-rotation hole 60 is engaged with the first anti-rotation member 50.

[0055] Based on forming the second groove 270 on one side of the main body portion 220 facing the conductive terminal 30, the conductive terminal 30 can be clamped through the second groove 270. Among them, the second groove 270 is a circular groove, and the diameter of the second groove 270 is larger than the aperture of the through hole 210. The through hole 210 communicates with the bottom surface of the second groove 270.

[0056] Based on setting the second groove 270, during the injection molding process of the plastic part 20, the conductive terminal 30 can be directly injection-molded and connected to the plastic part 20, which is convenient for 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 anti-rotation member 50 is engaged in the anti-rotation hole 60. Thus, relative rotation between the conductive terminal 30 and the plastic part 20 can be prevented.

[0057] In some embodiments, the anti-rotation hole 60 is arranged on the side of the conductive terminal 30 facing the main body portion 220, and the first anti-rotation member 50 is arranged on the bottom surface of the second groove 270. Specifically, the anti-rotation hole 60 can be a circular hole arranged on the side of the conductive terminal 30 facing the main body portion 220. The first anti-rotation member 50 can be a circular column arranged on the bottom surface of the second groove 270. Among them, two circular holes can be arranged, and the two circular holes are symmetrically arranged on both sides of the abutting portion 310. Correspondingly, two first anti-rotation members 50 are also arranged on the bottom surface of the second groove 270, and the two first anti-rotation members 50 are symmetrically arranged on both sides of the through hole 210. Of course, the number of circular holes can also be set to three, four or more, and multiple circular holes can be arranged in central symmetry along the center of the abutting portion 310. Correspondingly, the number of the first anti-rotation members 50 is also set to multiple, and multiple first anti-rotation members 50 are arranged in central symmetry along the center of the through hole 210.

[0058] In some embodiments, the stop hole 60 is provided on the bottom surface of the second groove 270, and the first stopper 50 is provided on the side of the conductive terminal 30 facing the main body 220. Specifically, the stop hole 60 can be a circular hole provided on the bottom surface of the second groove 270. The first stopper 50 can be a circular column provided on the side of the conductive terminal 30 facing the main body 220. Therein, two circular holes can be provided, and the two circular holes are symmetrically provided on both sides of the through hole 210. Correspondingly, two first stoppers 50 are also provided on the side of the conductive terminal 30 facing the main body 220, and the two first stoppers 50 are symmetrically provided on both sides of the abutment 310. Of course, the number of circular holes can also be set to three, four or more, so that the multiple circular holes can be arranged symmetrically along the center of the through hole 210. Correspondingly, the number of the first stoppers 50 is also set to multiple, and the multiple first stoppers 50 are arranged symmetrically along the center of the abutment 310.

[0059] like Figure 4 and Figure 5 As shown, in some embodiments, the plastic part 20 further includes a shielding portion 280. A liquid injection hole 2810 is formed on the shielding portion 280. The shielding portion 280 is connected between two adjacent connecting portions 240.

[0060] Based on the shielding portion 280 being constructed on one of the make way passages 250 , a liquid injection hole 2810 may be formed on the shielding portion 280 , so that electrolyte is added into the single battery through the liquid injection hole 2810 .

[0061] For example, if the number of the connecting parts 240 is set to 8, 8 clearance channels 250 can be formed on the plastic part 20. A shielding part 280 is constructed on one of the clearance channels 250, and a liquid injection hole 2810 is formed on the shielding part 280. Thus, 7 clearance channels 250 for welding the tabs and one shielding part 280 for injecting electrolyte can be formed on the plastic part 20.

[0062] In some embodiments, the shielding portion 280 may be integrally injection-molded with the main body 220, the annular portion 230, and two adjacent connecting portions 240. Then, two sides of the shielding portion 280 are respectively connected to a connecting portion 240.

[0063] In some embodiments, the shielding portion 280 can also be directly integrally injection-molded between the main body portion 220 and the annular portion 230. Then, both sides of the shielding portion 280 are respectively arranged at intervals from a connecting portion 240. For example, a shielding portion 280 can be constructed between the main body portion 220 and the annular portion 230, and six connecting portions 240 can be constructed between the main body portion 220 and the annular portion 230, and the connecting portion 240 is arranged at intervals from the shielding portion 280. At this time, seven relief channels 250 for welding the tab and a shielding portion 280 for injecting the electrolyte can also be formed on the plastic part 20.

[0064] The liquid injection hole 2810 on the shielding portion 280 is used to communicate with the liquid injection hole on the cover plate 80 to inject the electrolyte into the single cell.

[0065] As Figure 2 shown, in some embodiments, the top cover assembly further includes a connecting member 70 and a cover plate 80. The connecting member 70 is sleeved on the main body portion 220. As Figure 7 shown, a first overlapping portion 710 is constructed on the circumferential side of the connecting member 70. The cover plate 80 is arranged in a ring shape and is disposed around the connecting member 70. As Figure 8 shown, a second overlapping portion 810 is connected to the inner ring of the cover plate 80, and the upper surface of the second overlapping portion 810 is lower than the upper surface of the cover plate 80. The second overlapping portion 810 overlaps on the first overlapping portion 710, and the second overlapping portion 810 is welded to the first overlapping portion 710.

[0066] A complete top cover assembly is formed by the cover plate 80. Among them, the connecting member 70 is used to connect the cover plate 80. Specifically, the cover plate 80 is in a circular ring shape, and the connecting member 70 is also in a circular ring shape. The connecting member 70 is sleeved on the main body portion 220. The outer ring of the connecting member 70 forms the first overlapping portion 710, and the inner ring of the cover plate 80 forms the second overlapping portion 810. The second overlapping portion 810 overlaps on the upper side of the first overlapping portion 710, and then the first overlapping portion 710 and the second overlapping portion 810 are fixedly connected by welding.

[0067] There is a height difference between the upper surface of the second overlapping portion 810 and the upper surface of the cover plate 80. After the second overlapping portion 810 overlaps with the first overlapping portion 710, the welding device can weld the first overlapping portion 710 and the second overlapping portion 810 on the upper surface of the second overlapping portion 810 to achieve the welded connection between the two. It can be understood that during the welding process of the first overlapping portion 710 and the second overlapping portion 810, the upper surface of the second overlapping portion 810 will cause the position of the upper surface of the second overlapping portion 810 to rise due to the accumulation or melting expansion of the solder. Since the height of the upper surface of the second overlapping portion 810 itself is lower than the height of the upper surface of the cover plate 80, after the first overlapping portion 710 and the second overlapping portion 810 are welded based on the height difference, the upper surface of the second overlapping portion 810 can be basically flush with the upper surface of the cover plate 80 to maintain the beauty of the top cover assembly.

[0068] Among them, to ensure that the cover plate 80 and the connecting member 70 can be welded, both the connecting member 70 and the cover plate 80 are made of metal materials.

[0069] Please continue to refer to Figure 4 and Figure 5 In some embodiments, a circular groove 290 is formed on the outer surface of the circumferential side of the main body portion 220. One of the circular groove 290 and the connecting member 70 is provided with a second anti-rotation member, and the other is provided with an anti-rotation notch 90. At least a part of the connecting member 70 is clamped in the circular groove 290, and the second anti-rotation member is clamped with the anti-rotation notch 90.

[0070] It can be understood that the circular groove 290 extends along the circumferential direction of the main body portion 220. Based on the circular ring-shaped structure of the connecting member 70, after the connecting member 70 is sleeved in the circular groove 290, to prevent relative rotation between the connecting member 70 and the main body portion 220 from causing the liquid injection holes 2810 of the cover plate 80 and the liquid injection holes 2810 of the shielding portion 280 to be misaligned. Then, through the cooperation of the second anti-rotation member and the anti-rotation notch 90, the mutual positioning between the connecting member 70 and the main body portion 220 can be realized. Thus, it is prevented that the connecting member 70 and the main body portion 220 rotate and cause the liquid injection holes 2810 of the cover plate 80 and the liquid injection holes 2810 of the shielding portion 280 to be misaligned.

[0071] In some embodiments, a second anti-rotation member is provided in the circular groove 290, and an anti-rotation notch 90 is formed in the inner ring of the connecting member 70. When the inner ring of the connecting member 70 is clamped in the circular groove 290, the anti-rotation notch 90 is clamped with the second anti-rotation member. Thereby, the mutual positioning between the connecting member 70 and the main body portion 220 is realized, and it is prevented that the connecting member 70 and the main body portion 220 rotate and cause the liquid injection holes 2810 of the cover plate 80 and the liquid injection holes 2810 of the shielding portion 280 to be misaligned.

[0072] Among them, the number of the second anti-rotation members can be set to at least two, and the at least two second anti-rotation members are arranged at intervals along the circumferential direction of the annular groove 290 on the groove bottom surface of the annular groove 290. Correspondingly, the number of the anti-rotation notches 90 is also set to at least two, and the at least two anti-rotation notches 90 are arranged at intervals along the circumferential direction of the inner ring of the connecting member 70. Among them, each anti-rotation notch 90 is clamped with a second anti-rotation member.

[0073] In some embodiments, an anti-rotation notch 90 is arranged in the annular groove 290, and a second anti-rotation member is formed on the inner ring of the connecting member 70. When the inner ring of the connecting member 70 is clamped in the annular groove 290, the anti-rotation notch 90 is clamped with the second anti-rotation member. Thus, the mutual positioning between the connecting member 70 and the main body portion 220 is realized, and the rotation of the connecting member 70 and the main body portion 220 is prevented, so that the liquid injection holes 2810 of the cover plate 80 and the liquid injection holes 2810 of the shielding portion 280 cannot be aligned.

[0074] Among them, the number of the second anti-rotation members can be set to at least two, and the at least two second anti-rotation members are arranged at intervals along the circumferential direction of the inner ring of the connecting member 70. Correspondingly, the number of the anti-rotation notches 90 is also set to at least two, and the at least two anti-rotation notches 90 are arranged at intervals along the circumferential direction of the annular groove 290 on the groove bottom surface of the annular groove 290. Among them, each anti-rotation notch 90 is clamped with a second anti-rotation member.

[0075] In some embodiments, the conductive terminal 30, the plastic part 20 and the connecting member 70 are injection-molded and connected.

[0076] Based on injection-molding and connecting the conductive terminal 30, the plastic part 20 and the connecting member 70, when the plastic part 20 is injection-molded, the conductive terminal 30 and the connecting member 70 have been placed in the mold of the injection molding machine. Thus, after the plastic part 20 is injection-molded, the conductive terminal 30, the plastic part 20 and the connecting member 70 form an integral structure. Thus, the top cover assembly formed by the integrated injection-molded part, the conductive terminal 30 and the connecting member 70 can also eliminate the differences between the pole column, the upper plastic and the lower plastic, which is convenient for subsequent integral assembly.

[0077] On the other hand, the embodiment of the present utility model also provides a single cell. The single cell includes the top cover assembly in the foregoing embodiment.

[0078] In some embodiments, the conductive terminal 30 and the current collector plate 10 are connected by the plastic part 20, and the abutting portion 310 of the conductive terminal 30 is directly electrically connected to 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.

[0079] This single cell especially includes a cylindrical battery.

[0080] In another aspect, an embodiment of the present utility model further provides a battery pack. The battery pack includes a plurality of battery modules, and each battery module includes a plurality of single cells as described in the foregoing embodiments.

[0081] In some embodiments, a plastic part 20 is used to connect the conductive terminal 30 and the current collector plate 10, and the abutting portion 310 of the conductive terminal 30 is directly electrically connected to 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.

[0082] The embodiments of the present utility model have been introduced in detail above. Specific examples are used herein to illustrate the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those skilled in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A top cover assembly, characterized in that: include: Collector plate; A plastic part connected to the current collecting plate, wherein the plastic part is provided with a through hole; A conductive terminal is connected to the plastic part, and the conductive terminal is configured with an abutment portion extending toward the current collecting disk. The abutment portion passes through the through hole and abuts against the current collecting disk.

2. The top cover assembly according to claim 1, characterized in that: The plastic parts include: a main body, wherein the through hole is configured in the main body; An annular portion, arranged on the outside of the main body portion and spaced apart from the main body portion; A connecting portion connected between the main body and the annular portion, wherein at least two connecting portions are provided, and at least two connecting portions are spaced apart along the circumference of the main body; Wherein, the main body, the annular portion and each two adjacent connecting portions enclose a clearance channel.

3. The top cover assembly according to claim 2, characterized in that: A first stepped groove is constructed on one side of the main body toward the current collecting plate, the first groove includes a first groove section and a second groove section that are interconnected, the first groove section is connected to the through hole, wherein the apertures of the through hole, the first groove section and the second groove section are gradually increased, a sealing member is disposed in the first groove section, the sealing member is sleeved on the abutting portion, the current collecting plate is constructed with an outer protrusion extending toward the main body, the outer protrusion is disposed in the second groove section, and abuts against the abutting portion.

4. The top cover assembly according to claim 2, characterized in that: A second groove is constructed on the side of the main body facing the conductive terminal, and the second groove is connected to the through hole, wherein one of the second groove and the conductive terminal is constructed with a first stop member, and the other is constructed with a stop hole, the conductive terminal is installed in the second groove, and the stop hole is engaged with the first stop member.

5. The top cover assembly according to claim 2, characterized in that: The plastic part further includes a shielding portion, on which a liquid 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 to 5, characterized in that: The top cover assembly also includes: A connecting piece, sleeved on the main body, wherein a first overlapping portion is configured on a peripheral side of the connecting piece; The cover plate is arranged in a ring shape and is arranged in a ring on the connecting piece, the inner ring of the cover plate is connected with a second overlapping portion, the upper surface of the second overlapping portion is lower than the upper surface of the cover plate, wherein the second overlapping portion overlaps the first overlapping portion, and the second overlapping portion is welded to the first overlapping portion.

7. The top cover assembly according to claim 6, characterized in that: The outer surface of the peripheral side of the main body is configured with an annular groove, and one of the annular groove and the connecting member is configured with a second anti-rotation member, and the other is configured with a anti-rotation notch, wherein at least a portion of the connecting member 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, characterized in that: The conductive terminal, the plastic component and the connecting component are connected by injection molding.

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

10. A battery pack, characterized in that: The invention comprises a plurality of battery modules, each of which comprises a plurality of single batteries as claimed in claim 9.

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