Top cover assembly and battery

Abstract

The utility model belongs to the technical field of battery structures, and discloses a top cover assembly and a battery. The top cover assembly comprises a top cover piece, an insulating soft rubber piece and a pole, the top cover piece is provided with a mounting hole, the insulating soft rubber piece is fixedly arranged in the mounting hole, the insulating soft rubber piece is provided with a pole hole, and the inner wall of the pole hole is provided with a limiting groove. A first limiting bulge is arranged at one end of the pole, a second limiting bulge is arranged at the other end of the pole, the first limiting bulge can penetrate through the pole hole along the limiting groove and can abut against the top surface of the insulating soft rubber part after penetrating through the pole hole, and the second limiting bulge can abut against the bottom surface of the insulating soft rubber part in a sealing manner. Through the top cover assembly, the pole can be conveniently and fixedly installed on the top cover piece, an insulating part and a sealing ring do not need to be used, the assembly process is greatly simplified, the manufacturing cost is reduced, the height of the pole protruding out of the top cover piece is also reduced, and therefore the space utilization rate of the two sides of the top cover assembly is reduced; and the energy density of the battery using the top cover assembly can be improved.

Description

Technical Field

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

[0002] A battery generally includes a shell, a top cover assembly, and a battery cell, wherein the battery cell is placed inside the shell. The battery cell is protected by a sealed structure composed of the top cover assembly and the shell. The positive and negative pins of the battery cell are connected to the top cover assembly, and the external circuit is connected to the top cover assembly to realize power supply.

[0003] Among them, the top cover assembly, as an important component of the battery, generally includes a metal sheet, a sealing ring, an insulating member, an explosion-proof valve, a positive pole, a positive terminal, a negative pole and a negative terminal, wherein the positive and negative poles are respectively connected to the positive and negative pins of the battery cell to be assembled. Taking the positive pole assembly as an example, one end of the positive pole is connected to the positive pin of the battery cell, and the other end passes through the preset positive pole pole hole on the metal sheet from the bottom surface of the metal sheet, and is fixedly connected to the positive terminal located on the top surface of the metal sheet, so as to realize the electrical connection between the positive pole pin and the positive terminal. At the same time, an insulating member is filled between the positive pole and the metal sheet to increase the conduction resistance between the positive pole and the metal sheet. Since the positive pole runs through the metal sheet, in order to ensure that the product does not leak, a sealing ring needs to be set on the positive pole for sealing. Therefore, in actual assembly, it is necessary to use a positive pole, a sealing ring, and an insulating member, which uses more parts, has a more complicated process, and has a higher production cost. It also occupies a larger space inside the battery, which reduces the energy density of the battery.

[0004] Based on the above, a top cover assembly and a battery are urgently needed to solve the above technical problems. Utility Model Content

[0005] One purpose of the utility model is to provide a top cover assembly with fewer parts and convenient assembly, which can improve production efficiency and reduce battery weight.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Top cover assembly, including:

[0008] A top cover sheet, wherein the top cover sheet has a mounting hole;

[0009] An insulating soft rubber part, the insulating soft rubber part is fixedly arranged in the mounting hole, the insulating soft rubber part has a pole hole, the inner wall of the pole hole is provided with a limiting groove, and the limiting groove penetrates the inner wall of the pole hole along the axial direction of the pole hole;

[0010] A pole, one end of the pole is provided with a first limiting protrusion, and the other end of the pole is provided with a second limiting protrusion, the first limiting protrusion can pass through the pole hole along the limiting groove, and after passing through, the first limiting protrusion can abut against the top surface of the insulating soft rubber part, and the second limiting protrusion can seal and abut against the bottom surface of the insulating soft rubber part, so as to pass the pole through the pole hole and fix it to the insulating soft rubber part.

[0011] Preferably, the top cover sheet is provided with an anti-rotation groove, and the insulating soft rubber component is limitedly embedded in the anti-rotation groove to limit the insulating soft rubber component from rotating around the axial direction of the mounting hole.

[0012] Preferably, the anti-rotation groove is arranged on the top surface of the top cover sheet, and a contoured protrusion is arranged on the top of the insulating soft rubber part, and the contoured protrusion is embedded in the anti-rotation groove from top to bottom.

[0013] Preferably, a reinforcement groove is provided on the bottom surface of the top cover sheet, a convex portion is defined between the reinforcement groove and the anti-rotation groove, a reinforcement protrusion is provided on the bottom surface of the insulating soft rubber part, and a concave portion is defined between the contoured protrusion and the reinforcement protrusion;

[0014] The raised portion is inserted into the recessed portion in a limited position.

[0015] Preferably, the insulating soft rubber component is sealed and connected to the inner wall surface of the mounting hole by injection molding.

[0016] Preferably, at least two first limiting protrusions are arranged on the pole along the circumferential direction of the pole, and two adjacent first limiting protrusions are arranged at intervals, and at least two rubber-encapsulated grooves are arranged on the top surface of the insulating soft rubber part, and the first limiting protrusions can be embedded and fixed in the rubber-encapsulated grooves in a one-to-one correspondence.

[0017] Preferably, the spacing distance between the bottom surface of the first limiting protrusion and the top surface of the second limiting protrusion is not greater than the height distance between the bottom surface of the rubber-encapsulating groove and the bottom surface of the insulating soft rubber component.

[0018] Preferably, a rotation groove is provided on the bottom surface of the pole, and the rotation groove is used to rotate the pole.

[0019] Preferably, the top cover assembly also includes a lower plastic part, which is fixedly connected to the bottom surface of the top cover sheet, and is provided with a through hole and a limiting groove. The through hole is coaxially arranged with the pole hole, and the pole can be inserted into the through hole and the pole hole, and the second limiting protrusion is limitedly embedded in the limiting groove.

[0020] Another object of the present invention is to provide a battery with high space utilization and high energy density.

[0021] To achieve this purpose, the utility model adopts the following technical solutions:

[0022] A battery, comprising the above-mentioned top cover assembly.

[0023] The beneficial effects of the utility model are as follows: through the top cover assembly, the pole can be conveniently sealed and fixedly installed on the top cover sheet, and there is no need to use insulating parts and sealing rings, which greatly simplifies the assembly process, reduces the production cost, and also reduces the height of the pole protruding from the top cover sheet, thereby saving space utilization on both sides of the top cover assembly, which is beneficial to improving the energy density of the battery using the top cover assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a top view of the top cover assembly provided by the utility model;

[0025] Figure 2 This is an exploded view of the top cover assembly provided by the utility model from a first perspective;

[0026] Figure 3 yes Figure 2 A partial enlarged view of point B in the middle;

[0027] Figure 4 This is an exploded view of the top cover assembly provided by the utility model from a second perspective;

[0028] Figure 5 is along Figure 1 Assembly drawing of the top cover assembly from a medium AA perspective;

[0029] Figure 6 is along Figure 5 A partial enlarged view of point C in the middle;

[0030] Figure 7 is along Figure 1 Assembly drawing of the top cover assembly from medium DD perspective.

[0031] In the figure:

[0032] 1. Top cover; 11. Mounting hole; 12. Profile groove; 13. Give way groove; 14. Reinforcement groove;

[0033] 2. Insulating soft rubber parts; 21. Pole hole; 211. Limiting groove; 212. Rubber-encapsulated groove; 22. Profiling protrusion; 23. Reinforcement protrusion;

[0034] 3. Pole; 31. First limiting protrusion; 32. Second limiting protrusion; 33. Rotation groove;

[0035] 4. lower plastic part; 41. through hole; 42. limit groove. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] 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.

[0039] 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.

[0040] The following is based on the attached Figure 1 To Attachment Figure 7The top cover assembly and the battery provided by the utility model are introduced. The top cover assembly can effectively reduce the number of required parts, simplify the assembly process, reduce the manufacturing cost, save the internal space of the battery, and improve the energy density of the battery. It should be noted that in this embodiment, for the convenience of introduction, the side of the top cover assembly and the corresponding structure close to the battery cell is defined as the bottom side, and the side away from the battery cell is defined as the top side, but this direction definition does not serve as a restriction on the use direction or installation direction of the top cover assembly.

[0041] Specifically, Figures 1 to 3 As shown, the top cover assembly includes a top cover sheet 1, an insulating soft rubber part 2 and a pole 3. The top cover sheet 1 is a sheet-like component with a certain hardness and structural strength, and is provided with a mounting hole 11, which is set through the thickness direction of the top cover sheet 1. The insulating soft rubber part 2 is made of a soft material with a certain elasticity, such as PFA, modified PPS, etc., and is fixedly set in the mounting hole 11 of the top cover sheet 1. A pole hole 21 is provided on the insulating soft rubber part 2, and the pole 3 can be passed through the pole hole 21 from bottom to top. And the inner wall of the pole hole 21 is provided with a through limiting groove 211 along its axial direction, and one end of the pole 3 is provided with a first limiting protrusion 31, and the first limiting protrusion 31 can pass through the pole hole 21 along the limiting groove 211, and after passing through, by rotating the pole 3, the first limiting protrusion 31 can abut against the top surface of the insulating soft rubber part 2. The other end of the pole 3 is provided with a second limiting protrusion 32 , which can be sealed against the bottom surface of the insulating soft rubber component 2 to cooperate with the first limiting protrusion 31 to fix the pole 3 in the insulating soft rubber component 2 .

[0042] During the assembly process, the pole 3 is first aligned with the pole hole 21, and the first limiting protrusion 31 is aligned with the limiting groove 211, and then the pole 3 is passed through the pole hole 21 from bottom to top. Due to the existence of the limiting groove 211, the first limiting protrusion 31 can pass through the pole hole 21 along the limiting groove 211, and after passing through, the pole 3 is rotated so that the first limiting protrusion 31 overlaps with the insulating soft rubber part 2 along the axial direction of the pole 3, and the insulating soft rubber part 2 can abut against the first limiting protrusion 31 from bottom to top. After the pole 3 passes through the pole hole 21, the first limiting protrusion 31 will abut against the top surface of the insulating soft rubber part 2, and the second limiting protrusion 32 will abut against the bottom surface of the insulating soft rubber part 2, thereby realizing the fixed connection between the pole 3 and the insulating soft rubber part 2. The insulating soft rubber part 2 is located between the pole 3 and the top cover sheet 1, and plays the insulating effect of the insulating part in the prior art, and can prevent the positive pole and the negative pole from being directly short-circuited and connected through the top cover sheet 1. At the same time, because the second limiting protrusion 32 can be sealed against the bottom surface of the insulating soft rubber part 2, it also plays the sealing effect of the sealing ring in the prior art, and can prevent the electrolyte from leaking through the pole hole 21.

[0043] Through the top cover assembly, the pole 3 can be conveniently sealed and fixedly installed on the top cover sheet 1, and there is no need to use insulating parts and sealing rings, which greatly simplifies the assembly process, reduces the production cost, and also reduces the height of the pole 3 protruding from the top cover sheet 1, thereby saving space utilization on both sides of the top cover assembly, which is beneficial to improving the energy density of the battery using the top cover assembly.

[0044] like Figure 3 As shown, in this embodiment, the top cover sheet 1 is provided with an anti-rotation groove, and the insulating soft rubber component 2 is limitedly embedded in the anti-rotation groove to limit the insulating soft rubber component 2 from rotating around the axial direction of the mounting hole 11 when the pole 3 is rotated.

[0045] Specifically, the anti-rotation groove is a square groove, which is arranged on the top surface of the top cover sheet 1. A profiling protrusion 22 is arranged on the top of the insulating soft rubber part 2, and the profiling protrusion 22 has the same cross-sectional profile as the square groove. The profiling protrusion 22 is embedded in the anti-rotation groove from top to bottom, thereby limiting the rotation of the insulating soft rubber part 2 around the axial direction of the mounting hole 11.

[0046] Of course, in some embodiments, groove structures of other shapes such as triangular grooves and cross grooves may also be used. The present invention does not make any specific limitation on this, as long as it can prevent the insulating soft rubber part 2 from rotating when the pole 3 is rotated.

[0047] like Figure 3 to Figure 4 As shown, in this embodiment, the bottom surface of the top cover sheet 1 is provided with a reinforcement groove 14, and the bottom surface of the insulating soft rubber part 2 is provided with a reinforcement protrusion 23, and the reinforcement protrusion 23 can be embedded in the reinforcement groove 14 from bottom to top. A convex portion is defined between the reinforcement groove 14 and the anti-rotation groove, and a concave portion is defined between the profiling protrusion 22 and the reinforcement protrusion 23. The convex portion is limited and inserted in the concave portion, so that the insulating soft rubber part 2 can be fixed along the axial direction of the mounting hole 11. When the internal pressure of the battery is large, the bottom surface of the pole 3 will be subjected to pressure from bottom to top, and the pressure will be transmitted to the top cover sheet 1 through the concave portion and the convex portion, so as to prevent the insulating soft rubber part 2 from loosening and detaching from the top cover sheet 1. Optionally, the convex portion is also provided with a clearance groove 13, and the clearance groove 13 is set one-to-one with the limiting groove 211, so that the depth of the limiting groove 211 meets the requirement of the first limiting protrusion 31 passing through.

[0048] At least two first limiting protrusions 31 are provided on the pole 3 along the circumferential direction of the pole 3. Correspondingly, the insulating soft rubber part 2 is provided with at least two limiting grooves 211, and the top surface of the insulating soft rubber part 2 is provided with at least two rubber-encapsulated grooves 212. The first limiting protrusions 31 can pass through the limiting grooves 211 one by one, and can be embedded and fixed in the rubber-encapsulated grooves 212 one by one, thereby preventing the pole 3 from rotating again, causing the first limiting protrusions 31 to be separated from the rubber-encapsulated grooves 212 and re-enter the limiting grooves 211, thereby causing the second limiting protrusions 32 to be separated from the bottom surface of the insulating soft rubber part 2, resulting in leakage.

[0049] Specifically, in this embodiment, Figure 3 , Figure 4 As shown, the top of the pole 3 is provided with four first limiting protrusions 31, and the four first limiting protrusions 31 are evenly arranged circumferentially at intervals of 90°. The insulating soft rubber part 2 is provided with four limiting grooves 211, and the four limiting grooves 211 are evenly arranged circumferentially at intervals of 90°. The top surface of the insulating soft rubber part 2 is provided with four rubber-coated grooves 212, and the four rubber-coated grooves 212 are evenly arranged circumferentially at intervals of 90°, and a rubber-coated groove 212 is provided in the middle position between two adjacent limiting grooves 211. The first limiting protrusions 31 can pass through the limiting grooves 211 one by one, and after the pole 3 rotates 45°, they can be embedded and fixed in the rubber-coated grooves 212 one by one, thereby preventing the pole 3 from rotating again. Exemplarily, the depth of the rubber-coated groove 212 is 0.1-0.3mm.

[0050] Alternatively, if Figure 4 As shown, the bottom surface of the pole 3 is provided with a rotation groove 33, and the rotation groove 33 is used to rotate the pole 3. The rotation groove 33 can be a hexagonal groove to facilitate the use of a hexagonal wrench to rotate the pole 3. Of course, a slotted groove, a cross slot, etc. can also be used to facilitate the use of a screwdriver to rotate the pole 3. The shape of the rotation groove 33 is not specifically limited in the present invention, and it is sufficient to facilitate the rotation of the pole 3.

[0051] Further, refer to Figures 5 to 7 As shown, in this embodiment, the insulating soft rubber part 2 is sealed and connected to the inner wall surface of the mounting hole 11 by injection molding. The injection molding method can not only quickly and conveniently fix the insulating soft rubber part 2 on the top cover sheet 1, but also ensure that there is a large contact area between the protrusion and the recess, thereby improving the connection strength between the insulating soft rubber part 2 and the top cover sheet 1 and the sealing performance between the two.

[0052] The insulating soft rubber part 2 can be divided into an upper half and a lower half with the recessed part as the boundary. The thickness of the upper half before being abutted against the first limiting protrusion 31 is preferably 1.8-2.3 mm, and when the pole 3 rotates so that the first limiting protrusion 31 is located between the limiting groove 211 and the rubber-encapsulated groove 212, the upper half will be over-compressed to 0.8-1.2 mm between the first limiting protrusion 31 and the protrusion, and after the pole 3 continues to rotate so that the first limiting protrusion 31 enters the rubber-encapsulated groove 212, the upper half will rebound to 1.3-1.5 mm. The thickness of the lower half before being abutted against the first limiting protrusion 31 is preferably 0.9-1.1 mm, and when the pole 3 is rotated so that the first limiting protrusion 31 is located between the limiting groove 211 and the rubber-coated groove 212, the lower half will be over-compressed to 0.7-0.9 mm between the second limiting protrusion 32 and the protrusion, and after the pole 3 continues to rotate so that the first limiting protrusion 31 enters the rubber-coated groove 212, the lower half will rebound to 0.5-0.7 mm. In this embodiment, the thickness of the top cover sheet 1 is 0.9-1.1 mm, and the spacing distance between the bottom surface of the first limiting protrusion 31 on the pole 3 and the top surface of the second limiting protrusion 32 is 2.7-3.3 mm. If the spacing distance between the bottom surface of the first limiting protrusion 31 and the top surface of the second limiting protrusion 32 is no greater than the height distance between the bottom surface of the rubber-encapsulating groove 212 and the bottom surface of the insulating soft rubber component 2, the second limiting protrusion 32 can achieve a sealing abutment effect on the bottom surface of the insulating soft rubber component 2, thereby avoiding leakage.

[0053] like Figure 1 , Figure 7 As shown, in this embodiment, the top cover assembly further includes a lower plastic part 4, which is fixedly connected to the bottom surface of the top cover sheet 1, and is provided with a through hole 41 and a stop groove 42, the through hole 41 is coaxially arranged with the pole hole 21, the pole 3 can be passed through the through hole 41 and the pole hole 21, and the second stop protrusion 32 is limitatively embedded in the stop groove 42. The stop groove 42 can prevent the pole 3 from moving in its radial direction, thereby preventing the insulation soft plastic part 2 from being pulled by the pole 3 and causing the inner wall of the mounting hole 11 to deteriorate.

[0054] The utility model also provides a battery, which includes the above-mentioned top cover assembly. Through the top cover assembly, the pole 3 can be conveniently fixedly installed on the top cover sheet 1, and no insulating member and sealing ring are needed, which greatly simplifies the assembly process, reduces the manufacturing cost, and also reduces the height of the pole 3 protruding from the top cover sheet 1, thereby saving the space utilization rate on both sides of the top cover assembly, which is conducive to improving the energy density of the battery using the top cover assembly.

[0055] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A top cover assembly, characterized in that: include: A top cover sheet (1), wherein the top cover sheet (1) has a mounting hole (11); An insulating soft rubber part (2), the insulating soft rubber part (2) being fixedly arranged in the mounting hole (11), the insulating soft rubber part (2) having a pole hole (21), the inner wall of the pole hole (21) being provided with a limiting groove (211), the limiting groove (211) penetrating the inner wall of the pole hole (21) along the axial direction of the pole hole (21); A pole (3), one end of the pole (3) is provided with a first limiting protrusion (31), and the other end of the pole (3) is provided with a second limiting protrusion (32), the first limiting protrusion (31) can pass through the pole hole (21) along the limiting groove (211), and after passing through, the first limiting protrusion (31) can abut against the top surface of the insulating soft rubber part (2), and the second limiting protrusion (32) can seal against the bottom surface of the insulating soft rubber part (2), so that the pole (3) is passed through the pole hole (21) and fixed to the insulating soft rubber part (2).

2. The top cover assembly according to claim 1, characterized in that: The top cover sheet (1) is provided with an anti-rotation groove, and the insulating soft rubber component (2) is limitedly embedded in the anti-rotation groove to limit the insulating soft rubber component (2) from rotating around the axial direction of the mounting hole (11).

3. The top cover assembly according to claim 2, characterized in that: The anti-rotation groove is arranged on the top surface of the top cover sheet (1), and a contoured protrusion (22) is arranged on the top of the insulating soft rubber part (2), and the contoured protrusion (22) is embedded in the anti-rotation groove from top to bottom.

4. The top cover assembly according to claim 3, characterized in that: The bottom surface of the top cover sheet (1) is provided with a reinforcement groove (14), a raised portion is defined between the reinforcement groove (14) and the anti-rotation groove, the bottom surface of the insulating soft rubber part (2) is provided with a reinforcement protrusion (23), a recessed portion is defined between the contoured protrusion (22) and the reinforcement protrusion (23); The raised portion is inserted into the recessed portion in a limited position.

5. The top cover assembly according to any one of claims 1 to 4, characterized in that: The insulating soft rubber part (2) is sealed and connected to the inner wall surface of the mounting hole (11) by injection molding.

6. The top cover assembly according to claim 5, characterized in that: At least two first limiting protrusions (31) are arranged on the pole (3) along the circumferential direction of the pole (3), and two adjacent first limiting protrusions (31) are arranged at intervals, and at least two rubber-encapsulated grooves (212) are arranged on the top surface of the insulating soft rubber part (2), and the first limiting protrusions (31) can be embedded and fixed in the rubber-encapsulated grooves (212) in a one-to-one correspondence.

7. The top cover assembly according to claim 6, characterized in that: The spacing distance between the bottom surface of the first limiting protrusion (31) and the top surface of the second limiting protrusion (32) is no greater than the height distance between the bottom surface of the rubber-encapsulating groove (212) and the bottom surface of the insulating soft rubber component (2).

8. The top cover assembly according to claim 5, characterized in that: The bottom surface of the pole (3) is provided with a rotation groove (33), and the rotation groove (33) is used to rotate the pole (3).

9. The top cover assembly according to claim 5, characterized in that: The top cover assembly also includes a lower plastic part (4), the lower plastic part (4) is fixedly connected to the bottom surface of the top cover sheet (1), the lower plastic part (4) is provided with a through hole (41) and a limiting groove (42), the through hole (41) is coaxially arranged with the pole hole (21), the pole (3) can be inserted into the through hole (41) and the pole hole (21), and the second limiting protrusion (32) is limitedly embedded in the limiting groove (42).

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

Images