Battery top cover assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery top cover assembly and a battery, the battery top cover assembly comprises a cover plate, a conductive terminal and a pole, the cover plate is provided with a communication hole in a penetrating manner, the conductive terminal is provided with a mounting hole, and the hole wall of the mounting hole and / or the peripheral wall of the pole are / is provided with a plurality of extrusion parts. The extrusion part extends along the axis direction of the communication hole, the pole penetrates through the communication hole and is inserted into the mounting hole, and the extrusion part is extruded and deformed to fill a gap between the pole and the mounting hole. According to the battery top cover assembly disclosed by the utility model, the extrusion parts are annularly and uniformly distributed on the hole wall of the mounting hole and / or the peripheral wall of the pole, so that in the process that the pole is inserted into the mounting hole for connection, the extrusion parts are extruded to partially deform and flow into a gap between the pole and the mounting hole; therefore, the peripheral wall of the pole is tightly attached to the hole wall of the mounting hole, and the gap between the peripheral wall of the pole and the hole wall of the mounting hole is reduced, so that the welding quality between the pole and the conductive terminal is ensured.

Description

Technical Field

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

[0002] Lithium batteries have been widely used in electric vehicles due to their high energy density, high power density, many cycles, and long storage time. Lithium batteries generally include a top cover assembly, and the electrical energy in the lithium battery is transmitted to the outside through the poles of the top cover assembly, thereby realizing the transmission of electrical energy.

[0003] In the prior art, the top cover assembly generally includes a pole, a cover plate, and a conductive terminal. One end of the pole is connected to the positive or negative pole of the core pack inside the battery, and the other end of the pole needs to pass through the cover plate to connect to the conductive terminal, so that the pole can realize the function of transmitting electric energy. The pole is usually inserted into the mounting hole of the conductive terminal and connected by welding. The prior art has the following defects: the mounting hole of the pole or the conductive terminal has production tolerances, so that there is a welding gap between the pole and the hole wall of the mounting hole, which easily leads to the occurrence of cold welding and blown welding, affecting the welding yield between the pole and the conductive terminal. Utility Model Content

[0004] The utility model aims to provide a battery top cover assembly and a battery, which have a simple structure and high connection accuracy between the pole and the conductive terminal.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, a battery top cover assembly is provided, comprising a cover plate, a conductive terminal and a pole, wherein the conductive terminal is arranged on a side of the cover plate away from a core pack of a battery, the pole is used to connect the core pack, the cover plate is penetrated with a connecting hole, the conductive terminal is provided with a mounting hole at a position corresponding to the connecting hole, a plurality of extrusion portions are evenly distributed in an annular manner on the hole wall of the mounting hole and / or the outer peripheral wall of the pole, the extrusion portions extend along the axial direction of the connecting hole, a portion of the pole passes through the connecting hole and is inserted into the mounting hole, and at least a portion of the extrusion portions are extruded and deformed to fill the gap between the pole and the mounting hole.

[0007] As a preferred solution of the battery top cover assembly, the hole wall of the mounting hole is evenly distributed with a plurality of first extrusion portions, the first extrusion portions having a first inclined surface, and the first inclined surface is inclined from an end adjacent to the cover plate toward an end away from the cover plate and toward the central axis of the mounting hole.

[0008] As a preferred embodiment of the battery top cover assembly, a plurality of second extrusion portions are annularly and uniformly arranged on the outer peripheral wall of the pole column. The second extrusion portion has a second inclined surface, and the second inclined surface inclines from one end adjacent to the core package towards the end away from the core package and towards the central axis direction of the pole column.

[0009] As a preferred embodiment of the battery top cover assembly, along the axial direction of the communication hole, the first extrusion portion and the second extrusion portion are arranged at intervals; and / or,

[0010] Along the circumferential direction of the mounting hole, the first extrusion portion and the second extrusion portion are arranged at intervals and alternately.

[0011] As a preferred embodiment of the battery top cover assembly, along the axial direction of the communication hole, at least part of the hole wall of the mounting hole is inclined, and the aperture of the mounting hole adjacent to the cover plate is larger than the aperture of the mounting hole away from the cover plate; and / or,

[0012] At least part of the outer peripheral wall of the pole column is inclined, and the diameter of the pole column adjacent to the core package is larger than the diameter of the pole column away from the core package.

[0013] As a preferred embodiment of the battery top cover assembly, the pole column includes a fixed end and a connection end protruding from the fixed end. The connection end is inserted into the mounting hole, and the conductive terminal abuts against the side of the fixed end where the connection end is provided.

[0014] As a preferred embodiment of the battery top cover assembly, the battery top cover assembly further includes a lower plastic, a sealing ring and an insulating gasket. The lower plastic is closely attached to the side of the cover plate facing away from the conductive terminal, and the lower plastic is provided with an avoidance hole. The pole column includes a connection portion and a mounting portion annularly protruding from the outer peripheral wall of the connection portion along the central axis of the connection portion. The connection portion sequentially passes through the avoidance hole and the communication hole to be connected to the conductive terminal. At least part of the lower plastic is clamped between the cover plate and the mounting portion. The sealing ring includes a first sealing portion and a second sealing portion annularly protruding from the outer peripheral wall of the first sealing portion along the central axis of the first sealing portion. The first sealing portion is sleeved on the outer periphery of the connection portion and clamped between the hole wall of the communication hole and the outer peripheral wall of the connection portion. The outer peripheral wall of the second sealing portion abuts against the hole wall of the avoidance hole. The insulating gasket is arranged on the side of the cover plate facing away from the conductive terminal, and the insulating gasket covers the connection gap between the second sealing portion and the hole wall of the avoidance hole.

[0015] As a preferred embodiment of the battery top cover assembly, a limiting groove is provided on the side of the cover plate facing away from the conductive terminal, and at least part of the insulating gasket is inserted into the limiting groove.

[0016] As a preferred embodiment of the battery top cover assembly, the battery top cover assembly further includes an upper plastic, the upper plastic is disposed between the conductive terminal and the cover plate, the first sealing portion abuts against the upper plastic, and one of the two adjacent sides of the upper plastic and the conductive terminal is provided with a first positioning portion, and the other is provided with a first positioning groove, and the first positioning portion is inserted into the first positioning groove; and / or,

[0017] One of the two adjacent sides of the upper plastic and the cover plate is provided with a second positioning portion, and the other is provided with a second positioning groove, and the second positioning portion is inserted into the second positioning groove.

[0018] As a preferred embodiment of the battery top cover assembly, along the axial direction of the communication hole, the thickness H of the insulating gasket ≥ 0.02 mm; and / or,

[0019] Along the radial direction of the communication hole, the distance D1 between the outer peripheral wall of the insulating gasket and the hole wall of the avoidance hole ≥ 0.15 mm, and the distance D2 between the inner peripheral wall of the insulating gasket and the outer peripheral wall of the second sealing portion ≥ 0.15 mm.

[0020] In a second aspect, a battery is provided, which includes a housing and the battery top cover assembly as described above, the housing is provided with a receiving groove for receiving the core package, and the battery top cover assembly is used to seal the notch of the receiving groove

[0021] Advantages of the present utility model: By annularly and uniformly arranging a plurality of extrusion portions on the hole wall of the mounting hole and / or the outer peripheral wall of the pole column, during the process of inserting the pole column into the mounting hole for connection, the extrusion portions are extruded and partially deformed under the pushing force of the insertion external force, and the deformed extrusion portions can flow into the gap between the pole column and the hole wall of the mounting hole, so that the outer peripheral wall of the pole column fits tightly with the hole wall of the mounting hole, reducing the gap between the outer peripheral wall of the pole column and the hole wall of the mounting hole, thereby ensuring the welding quality between the pole column and the conductive terminal. Description of the Drawings

[0022] The present utility model will be further described in detail below with reference to the drawings and embodiments.

[0023] Figure 1 is a schematic structural view of the battery top cover assembly according to an embodiment of the present utility model;

[0024] Figure 2 is an exploded view of the battery top cover assembly according to an embodiment of the present utility model;

[0025] Figure 3 is Figure 2 an enlarged view of part A of

[0026] Figure 4It is a schematic structural diagram of a terminal post according to an embodiment of the present utility model;

[0027] Figure 5 It is a cross-sectional view of a battery top cover assembly according to an embodiment of the present utility model;

[0028] Figure 6 It is Figure 5 an enlarged schematic view of part B of

[0029] Figure 7 It is Figure 6 an enlarged schematic view of part C of

[0030] Figure 8 It is an exploded schematic view of a conductive terminal, an upper plastic and a cover plate according to an embodiment of the present utility model.

[0031] In the figure:

[0032] 1. Cover plate; 11. Communication hole; 12. Limit groove; 13. Second positioning groove; 2. Conductive terminal; 21. Mounting hole; 22. First positioning groove; 3. Terminal post; 31. Connection part; 311. Connection end; 312. Fixed end; 32. Mounting part; 4. Extrusion part; 41. First extrusion part; 411. First inclined surface; 42. Second extrusion part; 421. Second inclined surface; 5. Lower plastic; 51. Avoidance hole; 6. Sealing ring; 61. First sealing part; 62. Second sealing part; 7. Insulating gasket; 8. Upper plastic; 81. First positioning part; 82. Second positioning part. Specific embodiments

[0033] The present utility model will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only parts related to the present utility model are shown in the drawings, rather than all structures.

[0034] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] like Figures 1 to 4 As shown, the battery top cover assembly of the utility model embodiment includes a cover plate 1, a conductive terminal 2 and a pole 3, the conductive terminal 2 is arranged on the side of the cover plate 1 away from the core pack of the battery, the pole is used to connect the core pack, the cover plate 1 is penetrated with a connecting hole 11, the conductive terminal 2 is provided with a mounting hole 21 at a position corresponding to the connecting hole 11, and the hole wall of the mounting hole 21 and / or the outer peripheral wall of the pole 3 are annularly evenly provided with a plurality of extrusion portions 4, the extrusion portions 4 extend along the axial direction of the connecting hole 11, part of the pole 3 passes through the connecting hole 11 and is inserted into the mounting hole 21, and at least part of the extrusion portion 4 is extruded and deformed to fill the gap between the pole 3 and the mounting hole 21.

[0038] It can be understood that by evenly distributing a plurality of extrusion portions 4 in an annular manner on the hole wall of the mounting hole 21 and / or the outer peripheral wall of the pole 3, during the process of the pole 3 being inserted into the mounting hole 21 for connection, the extrusion portion 4 is extruded and partially deformed under the push of the external force of insertion, and the deformed extrusion portion 4 can flow into the gap between the pole 3 and the mounting hole 21, so that the outer peripheral wall of the pole 3 and the hole wall of the mounting hole 21 fit tightly, reducing the gap between the outer peripheral wall of the pole 3 and the hole wall of the mounting hole 21, thereby ensuring the welding quality between the pole 3 and the conductive terminal 2. By filling the gap between the outer peripheral wall of the pole 3 and the hole wall of the mounting hole 21 through the deformation of the extrusion portion 4, the production accuracy requirements of the outer peripheral wall of the pole 3 and the hole wall of the mounting hole 21 of the conductive terminal 2 can be reduced, thereby improving the production convenience of the pole 3 and the conductive terminal 2.

[0039] It should be noted that in some embodiments, the extrusion portion 4 may be provided only on the hole wall of the mounting hole 21, and the extrusion portion 4 is not provided on the outer peripheral wall of the pole column 3. That is, during the process of inserting the pole column 3 into the mounting hole 21, the pole column 3 can extrude the extrusion portion 4 to cause the extrusion portion 4 to deform, that is, a part of the extrusion portion 4 is extruded and deformed and melted to flow and fill the gap between the outer peripheral wall of the pole column 3 and the hole wall of the mounting hole 21, so as to realize the interference fit between the pole column 3 and the mounting hole 21.

[0040] Of course, the extrusion portion 4 may also be provided only on the outer peripheral wall of the pole column 3, and the extrusion portion 4 is not provided on the hole wall of the mounting hole 21. At this time, during the process of sleeving the conductive terminal 2 on the pole column 3 through the mounting hole 21, the hole wall of the mounting hole 21 can extrude the extrusion portion 4 to cause the extrusion portion 4 to deform, so as to fill the gap between the outer peripheral wall of the pole column 3 and the hole wall of the mounting hole 21, and realize the interference fit between the pole column 3 and the mounting hole 21. In addition, the extrusion portion 4 may also be provided on both the hole wall of the mounting hole 21 and the outer peripheral wall of the pole column 3. That is, during the process of inserting the pole column 3 into the mounting hole 21, the extrusion portion 4 on the outer peripheral wall of the pole column 3 and the extrusion portion 4 on the hole wall of the mounting hole 21 can both deform to fill each other the gap between the outer peripheral wall of the pole column 3 and the hole wall of the mounting hole 21, and realize the interference fit between the pole column 3 and the mounting hole 21.

[0041] Further, as Figure 2 and Figure 3 shown, a plurality of first extrusion portions 41 are annularly and uniformly arranged on the hole wall of the mounting hole 21. The first extrusion portion 41 has a first inclined surface 411, and the first inclined surface 411 is inclined from the end adjacent to the cover plate 1 towards the end away from the cover plate 1 and towards the central axis direction of the mounting hole 21. By providing the first inclined surface 411, the blocking of the end of the first extrusion portion 41 adjacent to the cover plate 1 to the pole column 3 is reduced, or the corners of the first extrusion portion 41 being stuck on the outer peripheral wall of the pole column 3 are reduced, and the pole column 3 can be slidably installed along the first inclined surface 411, improving the guiding property of the insertion and installation of the pole column 3 and the coherence of promoting the deformation of the first extrusion portion 41.

[0042] Optionally, as Figure 2 and Figure 4As shown, the outer peripheral wall of the pole 3 is evenly distributed with a plurality of second extrusion parts 42 in an annular manner, and the second extrusion part 42 has a second inclined surface 421, and the second inclined surface 421 is inclined from one end adjacent to the core package toward one end away from the core package and toward the central axis of the pole 3, that is, the end of the pole 3 away from the conductive terminal 2 is the fixed end 312, and the second inclined surface 421 is inclined from one end adjacent to the fixed end 312 toward one end away from the fixed end 312 and toward the central axis of the pole 3. By setting the second inclined surface 421, the blocking of the conductive terminal 2 by the side of the second extrusion part 42 away from the core package is reduced, or the impact wear caused by the corner of the second extrusion part 42 on the aperture of the mounting hole 21 is reduced, and the conductive terminal 2 can be guided and slidably installed along the second inclined surface 421, thereby improving the installation guidance of the conductive terminal 2 sleeve and promoting the continuity of the deformation of the second extrusion part 42.

[0043] Furthermore, when the first extrusion portion 41 is provided on the hole wall of the mounting hole 21, and the second extrusion portion 42 is provided on the outer peripheral wall of the pole 3, the first extrusion portion 41 and the second extrusion portion 42 are arranged at intervals along the axial direction of the connecting hole 11, that is, the first extrusion portion 41 is provided in the upper half of the hole wall of the mounting hole 21, and the second extrusion portion 42 is provided in the lower half of the outer peripheral wall of the pole 3, so as to ensure that the first extrusion portion 41 and the second extrusion portion 42 can be fully extruded and deformed, and avoid the first extrusion portion 41 and the second extrusion portion 42 from overlapping excessive deformation and overflowing. In addition, in the circumferential direction of the mounting hole 21, the first extrusion portion 41 and the second extrusion portion 42 are alternately arranged at intervals, so as to ensure that the cast part of the first extrusion portion 41 and the second extrusion portion 42 can flow into the gap between the pole 3 and the mounting hole 21 in time after the deformation and ablation, so as to avoid the mutual extrusion of the metals after the deformation of the first extrusion portion 41 and the second extrusion portion 42.

[0044] Of course, in some embodiments, there may be an overlapping portion between the first extrusion portion 41 and the second extrusion portion 42 along the axial direction of the connecting hole 11. At this time, the first extrusion portion 41 and the second extrusion portion 42 are spaced apart along the axial direction of the connecting hole 11, that is, the first extrusion portion 41 is inserted and deformed between two adjacent second extrusion portions 42, and the second extrusion portion 42 is inserted and deformed between two adjacent first extrusion portions 41, thereby fully reducing the gap between the outer peripheral wall of the pole 3 and the inner wall of the mounting hole 21.

[0045] Furthermore, along the axial direction of the communicating hole 11, the hole wall of the mounting hole 21 is at least partially inclined, and the hole diameter of the mounting hole 21 at one end adjacent to the cover plate 1 is larger than the hole diameter of the mounting hole 21 at one end away from the cover plate 1. By setting the hole wall of the mounting hole 21 to an inclined structure, it is easy to guide the pole 3 when it is inserted into the mounting hole 21, thereby improving the installation accuracy of the pole 3.

[0046] Preferably, at least a part of the outer peripheral wall of the pole column 3 is inclined. The diameter of the pole column 3 adjacent to the core package is larger than the diameter of the pole column 3 away from the core package. That is, one end of the pole column 3 away from the conductive terminal 2 is the fixed end 312, and the diameter of the pole column 3 adjacent to the fixed end 312 is larger than the diameter of the pole column 3 away from the fixed end 312. By setting the outer peripheral wall of the pole column 3 into an inclined structure, it is convenient for guiding when the pole column 3 is inserted into the mounting hole 21, and the mounting accuracy of the pole column 3 is improved. Of course, more preferably, the inclination angle of the hole wall of the mounting hole 21 is the same as the inclination angle of the outer peripheral wall of the pole column 3, so that the outer peripheral wall of the pole column 3 is as close as possible to or abuts against the hole wall of the mounting hole 21.

[0047] Further, the pole column 3 includes a fixed end 312 and a connection end 311 protruding from the fixed end 312. The connection end 311 is inserted into the mounting hole 21, and the conductive terminal 2 abuts against the side of the fixed end 312 where the connection end 311 is provided. Through the setting of the fixed end 312, when the pole column 3 is inserted into the mounting hole 21, the fixed end 312 can be used to block the conductive terminal 2, improving the mounting accuracy of the pole column 3 and preventing the connection end 311 of the pole column 3 from passing outside the mounting hole 21.

[0048] Of course, in some embodiments, the surface of the fixed end 312 that abuts against the conductive terminal 2 is the abutting surface, and the abutting surface is arranged at an acute angle with the central axis of the pole column 3. That is, the abutting surface forms a collecting groove with an acute angle depression with the outer peripheral wall of the connection end 311. This collecting groove can accommodate part of the extrusion part 4 that flows out of the mounting hole 21, improving the safety of the connection between the pole column 3 and the conductive terminal 2.

[0049] Optionally, the dimension of the extrusion part 4 in the radial direction of the communication hole 11 should be greater than or equal to 0.02 mm and less than or equal to 0.8 mm. For example, the dimension of the extrusion part 4 in the radial direction of the communication hole 11 is 0.02 mm, 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, etc. The dimension of the extrusion part 4 in the radial direction of the communication hole 11 can always ensure that the extrusion part 4 can be extruded and deformed without excessive redundancy.

[0050] In some embodiments, such as Figures 5 to 7As shown, the battery top cover assembly also includes a lower plastic 5, a sealing ring 6 and an insulating gasket 7. The lower plastic 5 is tightly attached to the side of the cover plate 1 away from the conductive terminal 2, and the lower plastic 5 is provided with an avoidance hole 51. The pole 3 includes a connecting portion 31 and a mounting portion 32 annularly protruding along the central axis of the connecting portion 31 and arranged on the outer peripheral wall of the connecting portion 31. The connecting portion 31 includes a connecting end 311 and a fixing end 312. The connecting portion 31 passes through the avoidance hole 51 and the connecting hole 11 in sequence to connect with the conductive terminal 2. The lower plastic 5 is at least partially sandwiched between the cover plate 1 and the mounting portion 31. 2, the sealing ring 6 includes a first sealing portion 61 and a second sealing portion 62 which is annularly protruded along the central axis of the first sealing portion 61 and is arranged on the outer peripheral wall of the first sealing portion 61. The first sealing portion 61 is sleeved on the outer periphery of the connecting portion 31 and is clamped between the hole wall of the communicating hole 11 and the outer peripheral wall of the connecting portion 31. The outer peripheral wall of the second sealing portion 62 abuts against the hole wall of the avoidance hole 51. The insulating gasket 7 is arranged on the side of the cover plate 1 away from the conductive terminal 2, and the insulating gasket 7 covers the connecting gap between the second sealing portion 62 and the hole wall of the avoidance hole 51.

[0051] It is understandable that the cover plate 1 is usually a metal component. In order to avoid the conductive breakdown between the pole 3 and the cover plate 1, and between the cover plate 1 and the electrolyte inside the battery, the lower plastic 5 and the sealing ring 6 are provided to effectively isolate the contact between the cover plate 1 and the pole 3 or the internal electrolyte, thereby improving the safety of the battery top cover assembly. However, since the sealing ring 6 and the lower plastic 5 are both elastic bodies, when the pole 3 is installed, the sealing ring 6 and the lower plastic 5 will be deformed under the extrusion of the pole 3 and the cover plate 1, and it is difficult for the outer peripheral wall of the second sealing portion 62 to completely fit with the hole wall of the avoidance hole 51, and there is a breakdown gap. Therefore, by setting the insulating gasket 7, the creepage distance between the cover plate 1 and the mounting portion 32 of the pole 3 can be increased, that is, the creepage distance between the outer wall of the insulating gasket 7 and the hole wall of the avoidance hole 51 along the radial direction of the connecting hole 11 is increased, or the creepage distance between the inner wall of the insulating gasket 7 and the outer wall of the second sealing portion 62 along the radial direction of the connecting hole 11 is increased, thereby reducing the possibility of risks such as fire and explosion of the battery and improving the safety of the battery operation.

[0052] Furthermore, a limiting groove 12 is provided on the side of the cover plate 1 facing away from the conductive terminal 2, and the insulating gasket 7 is at least partially inserted into the limiting groove 12. By setting the limiting groove 12, the insulating gasket 7 can be limited, the movement of the insulating gasket 7 can be reduced, and the installation accuracy of the insulating gasket 7 can be improved.

[0053] Furthermore, if Figure 8As shown in the figure, the battery top cover assembly further includes an upper plastic 8, which is disposed between the conductive terminal 2 and the cover plate 1. The first sealing portion 61 abuts against the upper plastic 8. A first positioning portion 81 is provided on the side of the upper plastic 8 facing the conductive terminal 2, and a first positioning groove 22 is provided on the side of the conductive terminal 2 facing the upper plastic 8. The first positioning portion 81 is inserted into the first positioning groove 22. By providing the upper plastic 8, conduction between the conductive terminal 2 and the cover plate 1 can be avoided. Through the cooperation of the first positioning portion 81 and the first positioning groove 22, the connection accuracy when the conductive terminal 2 is installed on the upper plastic 8 can be improved. In addition, it is not limited to setting the first positioning portion 81 on the side of the upper plastic 8 facing the conductive terminal 2 and setting the first positioning groove 22 on the side of the conductive terminal 2 facing the upper plastic 8. The first positioning portion 81 can also be set on the side of the conductive terminal 2 facing the upper plastic 8, and the first positioning groove 22 can be set on the side of the upper plastic 8 facing the conductive terminal 2.

[0054] Certainly, a second positioning portion 82 protrudes from the side of the upper plastic 8 facing the cover plate 1, and a second positioning groove 13 is recessed from the side of the cover plate 1 facing the upper plastic 8. The second positioning portion 82 is inserted into the second positioning groove 13. Through the fitting connection of the second positioning portion 82 and the second positioning groove 13, the positioning accuracy when the upper plastic 8 is installed on the cover plate 1 can be improved. In addition, it is not limited to setting the second positioning portion 82 on the side of the upper plastic 8 facing the cover plate 1 and setting the second positioning groove 13 on the side of the cover plate 1 facing the upper plastic 8. The second positioning portion 82 can also be set on the side of the cover plate 1 facing the upper plastic 8, and the second positioning groove 13 can be set on the side of the upper plastic 8 facing the cover plate 1.

[0055] Optionally, as Figure 7 shown, along the axial direction of the communication hole 11, the thickness H of the insulating gasket 7 ≥ 0.02 mm. For example, the thickness H of the insulating gasket 7 is 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, etc. The insulating gasket 7 with this thickness dimension is not easily broken down and has good barrier properties.

[0056] In addition, along the radial direction of the communication hole 11, the distance D1 between the outer peripheral wall of the insulating gasket 7 and the hole wall of the avoidance hole 51 ≥ 0.15 mm, and the distance D2 between the inner peripheral wall of the insulating gasket 7 and the outer peripheral wall of the second sealing portion 62 ≥ 0.15 mm. For example, the distance D1 between the outer peripheral wall of the insulating gasket 7 and the hole wall of the avoidance hole 51 and the distance D2 between the inner peripheral wall of the insulating gasket 7 and the outer peripheral wall of the second sealing portion 62 are 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc. This dimension distance can ensure sufficient creepage distance between the cover plate 1 and the pole column 3, and has high safety.

[0057] An embodiment of the present utility model further provides a battery, which includes a housing and a battery top cover assembly as described in any of the above embodiments. The housing is provided with a receiving groove for receiving a core package, and the battery top cover assembly is used to seal the notch of the receiving groove. The positive electrode tab of the core package is connected to the positive electrode column of the battery top cover assembly, and the negative electrode tab of the core package is connected to the negative electrode column of the battery top cover assembly. The welding quality of the electrode column 3 of the battery top cover assembly of this battery and the conductive terminal 2 is high, and the battery quality is good.

[0058] Obviously, the above embodiments of the present utility model are merely examples for clearly explaining the present utility model, rather than limiting the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the claims of the present utility model.

Claims

1. A battery top cover assembly, characterized in that: It includes a cover plate, a conductive terminal and a pole, wherein the conductive terminal is arranged on a side of the cover plate away from the core pack of the battery, the pole is used to connect the core pack, the cover plate is penetrated with a connecting hole, the conductive terminal is opened with a mounting hole at a position corresponding to the connecting hole, the hole wall of the mounting hole and / or the outer peripheral wall of the pole are annularly evenly provided with a plurality of extrusion parts, the extrusion parts extend along the axial direction of the connecting hole, part of the pole passes through the connecting hole and is inserted into the mounting hole, and at least part of the extrusion parts are extruded and deformed to fill the gap between the pole and the mounting hole.

2. The battery top cover assembly according to claim 1, characterized in that: The hole wall of the mounting hole is evenly distributed with a plurality of first extrusion parts in an annular shape. The first extrusion parts have a first inclined surface, which is inclined from an end adjacent to the cover plate toward an end away from the cover plate and toward the central axis of the mounting hole.

3. The battery top cover assembly according to claim 2, characterized in that: The outer peripheral wall of the pole is evenly distributed with a plurality of second extrusion parts, each of which has a second inclined surface, which is inclined from an end adjacent to the core package toward an end away from the core package and toward the central axis of the pole.

4. The battery top cover assembly according to claim 3, characterized in that: Along the axial direction of the communicating hole, the first extrusion portion and the second extrusion portion are spaced apart from each other; and / or, Along the circumferential direction of the mounting hole, the first extrusion portions and the second extrusion portions are alternately arranged at intervals.

5. The battery top cover assembly according to any one of claims 1 to 4, characterized in that: Along the axial direction of the connecting hole, the hole wall of the mounting hole is at least partially inclined, and the hole diameter of the mounting hole adjacent to the cover plate is larger than the hole diameter of the mounting hole away from the cover plate; and / or, The outer peripheral wall of the pole is at least partially inclined, and the diameter of the pole adjacent to the core package is larger than the diameter of the pole away from the core package.

6. The battery top cover assembly according to any one of claims 1 to 4, characterized in that: The pole comprises a fixed end and a connecting end protruding from the fixed end, the connecting end is inserted into the mounting hole, and the conductive terminal abuts against a side of the fixed end where the connecting end is arranged.

7. The battery top cover assembly according to any one of claims 1 to 4, characterized in that: The terminal block further comprises a first sealing member and a second sealing member which is provided on a peripheral wall of the first sealing member and is provided with a sealing ring. The sealing member is provided with a sealing ring which is provided on a peripheral wall of the first sealing member and is provided with a sealing ring. The terminal block further comprises a first sealing member and a second sealing member which is provided on a peripheral wall of the first sealing member and is provided with a sealing ring which is provided with a sealing ring. The sealing member is provided with a sealing ring which is provided with a sealing ring which is provided with a sealing ring which is provided with a sealing ring which is provided with a sealing ring which is provided with a sealing ring which is provided with a sealing ring which is provided with a sealing ring which is provided with a sealing ring which is provided with a sealing ring which is provided with a sealing ring which is provided with a sealing ring 8. The battery top cover assembly according to claim 7, characterized in that: A limiting groove is provided on a side of the cover plate facing away from the conductive terminal, and the insulating gasket is at least partially inserted into the limiting groove.

9. The battery top cover assembly according to claim 7, characterized in that: It also includes an upper plastic, the upper plastic is arranged between the conductive terminal and the cover plate, the first sealing portion abuts against the upper plastic, one of the two sides adjacent to each other of the upper plastic and the conductive terminal is provided with a first positioning portion, and the other is provided with a first positioning groove, the first positioning portion is inserted into the first positioning groove; and / or, One of the two sides of the upper plastic and the cover plate adjacent to each other is provided with a second positioning portion, and the other is provided with a second positioning groove, and the second positioning portion is inserted into the second positioning groove.

10. The battery top cover assembly according to claim 7, characterized in that: Along the axial direction of the connecting hole, the thickness H of the insulating gasket is ≥ 0.02 mm; and / or, Along the radial direction of the connecting hole, the distance D1 between the outer peripheral wall of the insulating gasket and the hole wall of the avoidance hole is ≥0.15 mm, and the distance D2 between the inner side wall of the insulating gasket and the outer peripheral wall of the second sealing portion is ≥0.15 mm.

11. A battery, characterized in that: It comprises a shell and a battery top cover assembly as described in any one of claims 1 to 10, wherein the shell is provided with a receiving groove for receiving the core pack, and the battery top cover assembly is used to seal the notch of the receiving groove.

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