Top cover assembly, battery and electric device

Abstract

The utility model relates to a top cover assembly, a battery and an electric device. The top cover assembly comprises a top cover piece, an insulating piece, a pole, an adapter piece and an injection molding piece, the pole penetrates through the pole mounting hole of the top cover plate and the pole avoiding hole of the insulating part, and a first gap and a second gap which are communicated with each other are formed between the pole and the hole wall of the pole; the switching piece comprises a pole connecting part, the pole connecting part covers the pole avoiding hole and is provided with a pole welding area and a through hole, and the through hole is communicated with the second gap; the injection molding part comprises a filling part and a coating part, the coating part covers the pole welding area and the through hole, the filling part is filled in the first gap, the second gap and the through hole, and the coating part is connected with the filling part; according to the utility model, the pole and the top cover plate pass through the injection molding part through the injection molding part, and the welding area of the pole is coated by the injection molding part, so that the battery cell cannot be polluted even if the welding flux cracks, and the safety of the battery and the electric device is better.

Description

Technical Field

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

[0002] Lithium-ion batteries are widely used in electric vehicles and 3C products due to their high energy density, no memory effect, long cycle life and environmental friendliness. In the prior art, the connection process of the cover assembly, the adapter and the battery cell is as follows: after the battery cell tab is welded to one end of the adapter and the cover assembly is assembled, the adapter and the cover assembly with the pole are loaded separately, and the other end of the adapter is welded to the pole. After that, in order to avoid the welding slag generated during the welding of the adapter and the pole to affect the battery, it is necessary to set a curing glue at the welding point between the adapter and the pole.

[0003] However, the above connection process is relatively complicated, and the curing glue provided at the welding point between the adapter and the pole is easy to fall off after long-term use of the battery. Utility Model Content

[0004] To this end, the utility model proposes a top cover assembly, a battery and an electrical device, which use injection molding to insulate and seal the pole and the top cover sheet while avoiding the fall of welding slag at the welding point between the adapter sheet and the pole, and the connection is quick.

[0005] In the first aspect, in order to solve the above technical problems, the utility model provides a top cover assembly, which includes:

[0006] A top cover sheet, wherein the top cover sheet is provided with a pole mounting hole;

[0007] An insulating member, wherein the insulating member and the top cover sheet are arranged in close contact; the insulating member has a pole avoidance hole arranged directly opposite to the pole mounting hole;

[0008] A pole, the pole is passed through the pole mounting hole and the pole avoidance hole; a first gap is formed between the pole and the hole wall of the pole mounting hole; a second gap is formed between the pole and the hole wall of the pole avoidance hole; the first gap is connected to the second gap;

[0009] The adapter plate includes a pole connection portion, the pole connection portion and the insulating member are arranged in close contact, and the pole connection portion covers the pole avoidance hole; the pole connection portion has a pole welding area and through holes located around the pole welding area, the pole and the pole connection portion are welded in the pole welding area; the through hole is connected to the second gap;

[0010] An injection molded part, the injection molded part includes a filling portion and a covering portion, the covering portion and the pole connecting portion are arranged in a close fit, and the covering portion covers the pole welding area and the through hole; the filling portion fills the first gap, the second gap and the through hole, and the covering portion and the filling portion are connected.

[0011] In one embodiment of the present invention, a plurality of through holes are provided, and the plurality of through holes are arranged in sequence at equal intervals around the pole welding area.

[0012] In one embodiment of the present invention, the injection molded part is an integrally molded structure.

[0013] In one embodiment of the utility model, the injection molded part and the pole are combined together by nano injection molding, and / or the injection molded part and the top cover sheet are combined together by nano injection molding, and / or the injection molded part and the pole connecting portion are combined together by nano injection molding, wherein the pole, the top cover sheet and the pole connecting portion are all provided with nano holes.

[0014] In one embodiment of the utility model, the pole connecting portion is provided with a first annular structure, the pole welding area and the through hole are both located on the inner side of the first annular structure; the insulating part is provided with a second annular structure at a position corresponding to the first annular structure, and the first annular structure and the second annular structure are matched in a concave-convex manner.

[0015] In an embodiment of the present invention, the adapter sheet is further provided with a pole lug connection portion connected to the pole column connection portion, and the pole lug connection portion has at least one pole lug connection area.

[0016] In one embodiment of the utility model, a high temperature resistant adhesive tape is provided between the insulating member and the tab connection portion, and the orthographic projection of the tab connection area on the high temperature resistant adhesive tape is completely located on the high temperature resistant adhesive tape.

[0017] In one embodiment of the present invention, the tab connection portion and the insulating member are arranged in close contact with each other, wherein the high temperature resistant adhesive tape is accommodated in a receiving groove surrounded by the insulating member and the tab connection portion.

[0018] In a second aspect, the utility model further provides a battery, which includes the top cover assembly described in any of the above embodiments.

[0019] In a third aspect, the utility model further provides an electrical device, which includes the battery described in the above embodiment.

[0020] The above technical solution of the utility model has the following advantages compared with the prior art:

[0021] The top cover assembly, battery and electrical device described in the utility model, on the one hand, use the injection molded parts to insulate and seal the pole and the top cover sheet, and on the other hand, use the injection molded parts to cover the welding area of ​​the pole, so that cracking of the solder or residual welding slag will not contaminate the battery cell, and the overall safety performance of the battery and the electrical device is better and the cycle life is longer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein:

[0023] Figure 1 It is a cross-sectional schematic diagram of a top cover assembly in a preferred embodiment of the utility model;

[0024] Figure 2 yes Figure 1 A magnified schematic diagram of the middle area;

[0025] Figure 3 It is a bottom view of a partial area of ​​the top cover assembly in a preferred embodiment of the utility model.

[0026] Explanation of the reference numerals in the drawings in the specification: 1. Top cover; 11. Pole mounting hole; 2. Insulating member; 21. Pole avoidance hole; 3. Pole; 4. Adapter; 41. Pole connecting portion; 411. Pole welding area; 412. Through hole; 42. Pole ear connecting portion; 421. Pole ear connecting area; 5. Injection molded part; 6. Covering portion; 7. First annular structure; 8. Second annular structure; 9. High temperature resistant adhesive tape. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0028] Embodiment 1

[0029] Reference Figure 1 to Figure 3 As shown, the first embodiment of the utility model provides a top cover assembly, which includes a top cover sheet 1, a pole 3, a adapter sheet 4 and an injection molded part 5; on the one hand, the top cover sheet 1 and the pole 3 are connected in a sealed and insulated manner by the injection molded part 5, and on the other hand, the injection molded part 5 covers the welding point between the pole 3 and the adapter sheet 4 to prevent welding slag from falling at the welding point between the pole 3 and the adapter sheet 4 and affecting the battery.

[0030] Specifically, refer to Figure 1As shown, the top cover sheet 1 is provided with a pole mounting hole 11, and the pole mounting hole 11 penetrates the top cover sheet 1 along the thickness direction of the top cover sheet 1. It should be noted that the pole mounting hole 11 is provided corresponding to the pole 2, that is, one or two poles can be provided. The top cover assembly also includes an insulating member 2, and the insulating member 2 is used to insulate the battery cell and the top cover sheet 1. The insulating member 2 is located on one side of the top cover sheet 1 along the thickness direction and is arranged in contact with the surface of the top cover sheet 1; the insulating member 2 has a pole avoidance hole 21 arranged opposite to the pole mounting hole 11, and the pole avoidance hole 21 penetrates the insulating member 2 along the thickness direction of the insulating member 2, and the pole avoidance hole 21 is connected to the pole mounting hole 11.

[0031] Continue, refer to Figure 1 As shown, the pole 3 is penetrated in the pole mounting hole 11 and the pole avoidance hole 21 along the axial direction, one end of the pole 3 in the axial direction passes through the pole mounting hole 11, and the other end of the pole 3 in the axial direction may not extend out of the pole avoidance hole 21, or may extend out of the pole avoidance hole 21, depending on the design of the adapter 4; a first gap is provided between the outer periphery of the pole 3 and the hole wall of the pole mounting hole 11, a second gap is provided between the outer periphery of the pole and the hole wall of the pole avoidance hole 21, and the second gap is connected to the first gap.

[0032] Continue, refer to Figure 1 As shown, the top cover sheet 1, the insulating member 2 and the adapter sheet 4 are arranged in sequence; the adapter sheet 4 includes a pole connection portion 41, the pole connection portion 41 and the insulating member 2 are arranged in close contact, and the pole connection portion 41 covers the pole avoidance hole 21; the pole connection portion 41 has a pole welding area 411, and the pole 3 is welded to the pole connection portion 41 in the pole welding area 411. The pole connection portion 41 also has a through hole 412, and the through hole 412 is located around the pole welding area 411 on the adapter sheet 4, and the through hole 412 is connected to the second gap. It should be noted that the through hole 412 is used to provide an avoidance space for the injection material in the molten state, so that the injection material in the molten state can enter from the second gap to one side of the pole connection portion 41 or from one side of the pole connection portion 41 to the second gap.

[0033] Continue, refer to Figure 1 As shown, the injection molded part 5 includes a filling portion and a covering portion 6; the covering portion 6 and the pole connecting portion 41 are arranged in close contact, and the covering portion 6 covers the pole welding area 411 and the through hole 412; the filling portion fills the first gap, the second gap and the through hole 412, and the covering portion 6 and the filling portion are connected. In some embodiments, the injection molded part 5 is an integrally molded structure.

[0034] It should be noted that the surface of the covering portion 6 is smooth and free of burrs, so as to prevent the top cover assembly from scratching the battery cells during battery assembly; the surface of the covering portion 6 on one side away from the adapter sheet 4 is arranged parallel to the top cover sheet 1, so that force can be evenly applied during assembly, so as to prevent the uneven surface of the covering portion 6 from squeezing and damaging the battery cells.

[0035] In some embodiments, the injection molded part 5 and the pole 3 are combined together by nano injection molding, and / or the injection molded part 5 and the top cover sheet 1 are combined together by nano injection molding, and / or the injection molded part 5 and the pole connecting part 41 are combined together by nano injection molding; the pole surface is nano-treated to remove grease and metal rust on its surface, and nano pores are formed on the pole 3, the top cover sheet 1 and the pole connecting part 41; the top cover sheet 1, the insulating part 2 and the pole 3 and the adapter sheet 4 welded together are put into a mold together, so that the injection molding material in a molten state enters the mold, and after cooling, part of the injection molded part is embedded in the nano pores, the filling part of the injection molded part fills the first gap, the second gap and the through hole 412, and the covering part of the injection molded part covers the pole welding area 411 and the through hole 412.

[0036] In this embodiment, the pole and the injection molded part 5 as well as the injection molded part 5 and the top cover sheet 1 are combined by nano injection molding, so that the pole and the injection molded part 5 as well as the injection molded part 5 and the top cover sheet 1 are tightly and firmly connected.

[0037] In some embodiments, the through holes 412 are provided in plurality, and the plurality of through holes 412 are arranged in sequence at equal intervals around the pole welding area 411. The plurality of through holes 412 are designed and arranged in sequence at equal intervals, so that the injection material in the molten state can enter the side of the pole connection part 41 from the second gap evenly and quickly or from the side of the pole connection part 41 to the second gap, thereby accelerating the injection molding efficiency. It should be noted that the through holes 412 are provided with two, three, four, five or six, and the specific number is not limited thereto; the through holes 412 can be formed in a circular, rectangular, waist-shaped or triangular shape, and the specific shape is not limited thereto.

[0038] In some embodiments, reference Figure 1 and Figure 2As shown, the pole connection part 41 is also provided with a first annular structure 7, the pole welding area 411 and the through hole 412 are both located inside the first annular structure 7, and a second annular structure 8 is provided on the surface of the insulating member 2 at a position corresponding to the first annular structure 7; the first annular structure 7 and the second annular structure 8 are matched in a concave-convex manner. By designing the first annular structure 7 and the second annular structure 8 to be matched in a concave-convex manner, on the one hand, the pole connection part 41 and the insulating member 2 are installed and positioned; on the other hand, the pole connection part 41 and the insulating member 2 are tightly connected.

[0039] Specifically, the first annular structure 7 is configured as an annular protrusion formed by the surface of the adapter plate 4, and the second annular structure 8 is configured as an annular groove formed by the depression on the surface of the insulating member 2; of course, the second annular structure 8 may be configured as an annular protrusion, and the first annular structure 7 may be configured as a matching annular groove.

[0040] In some embodiments, reference Figure 3 As shown, the adapter plate 4 is also provided with a pole lug connection portion 42, and the pole lug connection portion 42 is connected to the pole column connection portion 41; the pole lug connection portion 42 is arranged parallel to or in close contact with the insulating member 2, and has at least one pole lug connection area 421, and the pole lug connection area 421 is used for welding the pole lug.

[0041] Further, refer to Figure 1 As shown, a high temperature resistant adhesive tape 9 is provided between the insulating member 2 and the tab connection portion 42, and the orthographic projection of the tab connection area 421 on the high temperature resistant adhesive tape 9 is completely located on the high temperature resistant adhesive tape 9. When the top cover assembly is connected to the battery tab, the tab connection area 421 of the adapter 4 is welded to the tab. A large amount of heat is generated during the connection process, which can easily affect the shape of the insulating member 2. The high temperature resistant adhesive tape 9 is located between the insulating member 2 and the tab connection portion 42 to play an isolating role, thereby preventing the high temperature generated during the welding of the tab from affecting the insulating member 2.

[0042] Furthermore, when the tab connection portion 42 is fitted with the insulating member 2, the high temperature resistant adhesive tape 9 is accommodated in the receiving groove formed by the insulating member 2 and the tab connection portion 42. By accommodating the high temperature resistant adhesive tape 9 having a certain thickness in the receiving groove, it is ensured that the insulating member 2 and the tab connection portion 42 can be fitted.

[0043] It should be noted that the accommodating groove is formed by the inward depression of the surface of the pole ear connecting portion 42 toward the insulating member 2, or the accommodating groove is formed by the inward depression of the surface of the insulating member 2 toward the adapter plate 4, or the accommodating groove is formed by splicing the depression on the surface of the insulating member 2 and the depression on the surface of the pole ear connecting portion 42.

[0044] Embodiment 2

[0045] Embodiment 2 of the present invention also provides a battery, which includes a shell, a battery cell and the top cover assembly described in Embodiment 1, the battery cell is arranged in the accommodating cavity of the shell, the top cover assembly is covered at the opening of the shell, and the top cover assembly seals the opening of the shell; the tabs and the tab connecting parts 42 of the battery cell are welded in the tab connecting area 421.

[0046] Embodiment 3

[0047] The third embodiment of the present invention further provides an electrical device, which includes the battery provided in the second embodiment.

[0048] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A top cover assembly, characterized in that: include, A top cover sheet (1), wherein the top cover sheet (1) is provided with a pole mounting hole (11); An insulating member (2), the insulating member (2) and the top cover sheet (1) being arranged in close contact with each other; the insulating member (2) having a pole avoidance hole (21) arranged facing the pole mounting hole (11); A pole (3), the pole (3) being inserted through the pole mounting hole (11) and the pole avoidance hole (21); a first gap being provided between the pole (3) and the hole wall of the pole mounting hole (11); a second gap being provided between the pole (3) and the hole wall of the pole avoidance hole (21); the first gap being connected to the second gap; An adapter plate (4), the adapter plate (4) comprising a pole connecting portion (41), the pole connecting portion (41) and the insulating member (2) being arranged in close contact with each other, and the pole connecting portion (41) covering the pole avoiding hole (21); the pole connecting portion (41) having a pole welding area (411) and through holes (412) located around the pole welding area (411), the pole (3) and the pole connecting portion (41) being welded in the pole welding area (411); the through holes (412) being connected to the second gap; An injection molded part (5), the injection molded part (5) comprising a filling portion and a covering portion (6), the covering portion (6) and the pole connecting portion (41) being arranged in close contact with each other, and the covering portion (6) covering the pole welding area (411) and the through hole (412); the filling portion is filled in the first gap, the second gap and the through hole (412), and the covering portion (6) and the filling portion are connected.

2. The top cover assembly according to claim 1, characterized in that: A plurality of through holes (412) are provided, and the plurality of through holes (412) are arranged in sequence at equal intervals around the pole welding area (411).

3. The top cover assembly according to claim 1, characterized in that: The injection molded part (5) is an integrally molded structure.

4. The top cover assembly according to claim 3, characterized in that: The injection molded part (5) and the pole (3) are combined together by nano injection molding, and / or the injection molded part (5) and the top cover sheet (1) are combined together by nano injection molding, and / or the injection molded part (5) and the pole connecting portion (41) are combined together by nano injection molding, wherein the pole (3), the top cover sheet (1) and the pole connecting portion (41) are all provided with nano pores.

5. The top cover assembly according to claim 1, characterized in that: The pole connecting portion (41) is provided with a first annular structure (7), and the pole welding area (411) and the through hole (412) are both located on the inner side of the first annular structure (7); the insulating member (2) is provided with a second annular structure (8) at a position corresponding to the first annular structure (7), and the first annular structure (7) and the second annular structure (8) are matched in a concave-convex manner.

6. The top cover assembly according to any one of claims 1 to 5, characterized in that: The adapter plate (4) is further provided with a pole lug connection portion (42) connected to the pole column connection portion (41), and the pole lug connection portion (42) has at least one pole lug connection area (421).

7. The top cover assembly according to claim 6, characterized in that: A high temperature resistant adhesive tape (9) is provided between the insulating member (2) and the tab connection portion (42), and the orthographic projection of the tab connection area (421) on the high temperature resistant adhesive tape (9) is completely located on the high temperature resistant adhesive tape (9).

8. The top cover assembly according to claim 7, characterized in that: The tab connection portion (42) and the insulating member (2) are arranged in close contact with each other, wherein the high temperature resistant adhesive tape (9) is accommodated in a receiving groove surrounded by the insulating member (2) and the tab connection portion (42).

9. A battery, characterized in that: The invention comprises the top cover assembly as claimed in any one of claims 1 to 8.

10. An electrical device, characterized in that: A battery comprising the battery of claim 9.

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