Battery top cover structure

Abstract

The utility model provides a battery top cover structure, which is characterized by comprising a top cover piece, a top cover plate, a top cover plate and a top cover plate, and second through holes are formed in two sides of the surface of the top cover plate; the upper plastic is mounted at the second through hole; the lower plastic is located below the top cover piece, a third through hole corresponding to the second through hole of the top cover piece is formed in the lower plastic, and a connecting piece is arranged below the third through hole of the lower plastic; the pole column is mounted on the upper plastic cement, and the lower end of the pole column penetrates through the second through hole and the third through hole to be welded and fixed with the connecting sheet; and the sealing ring is arranged at the third through hole of the lower plastic cement, and the sealing ring seals a gap at the matched part of the pole, the connecting sheet and the top cover sheet. The sealing ring is arranged, so that the pole, the connecting sheet, the top cover sheet, the upper plastic and the upper plastic around the sealing ring are tightly attached, and the pole and the connecting sheet are in contact with each other through bounce generated by extruding the sealing ring after being welded, so that the yield of the resistor is improved.

Description

Technical Field

[0001] The utility model belongs to the field of power batteries and relates to a battery top cover structure. Background Art

[0002] The power batteries in the prior art include a cover plate, and the cover plate includes a top cover sheet, a pole column and a riveting block. In order to provide the current-carrying and thrust capabilities of the battery cell, the pole column and the riveting block are fixed by welding.

[0003] In the existing structure, the pole column, the upper plastic and the top cover sheet are electrically connected through compressive contact, and the sealing ring ensures the sealing effect through the compression amount. Now, a certain rebound force will be generated when the sealing ring is between the top cover sheet and the pole column, making the pole column, the top cover sheet and the upper plastic unable to fit tightly. Moreover, the ordinary L-shaped sealing ring will bulge under pressure, causing the sealing to fail and resulting in a high resistance. Summary of the Utility Model

[0004] The purpose of the utility model is to address the above problems in the existing technology and propose a battery top cover structure. By setting a sealing ring with a second groove and a first part, the pole column, the connecting piece, the top cover sheet, the upper plastic and the upper plastic part around the sealing ring are tightly fitted, and the contact between the above parts is achieved through the rebound force generated by squeezing the sealing ring after welding the pole column and the connecting piece, thereby improving the resistance yield.

[0005] The purpose of the utility model can be achieved by the following technical solutions: A battery top cover structure, characterized in that it includes:

[0006] A top cover sheet, with second through holes opened on both sides of its surface;

[0007] An upper plastic, which is installed at the second through holes;

[0008] A lower plastic, which is located below the top cover sheet and the lower plastic is provided with a third through hole corresponding to the second through hole of the top cover sheet, and a connecting piece is provided below the third through hole of the lower plastic;

[0009] A pole column, which is installed on the upper plastic and the lower end of the pole column passes through the second through hole and the third through hole and is welded and fixed to the connecting piece;

[0010] A sealing ring, which is arranged at the third through hole of the lower plastic, and the sealing ring seals the gap at the matching part of the pole column, the connecting piece and the top cover sheet.

[0011] Further, an explosion-proof valve is provided in the middle of the top cover sheet, and an explosion-proof valve film is attached to the explosion-proof valve.

[0012] Further, a first through hole for the end part of the pole column to pass through is opened on the upper plastic, the upper plastic also has a first cavity for installing the pole column, and a first convex ring is provided on the lower side of the first through hole of the upper plastic.

[0013] Further, a second cavity for installing the upper plastic is provided at the second through hole of the top cover sheet.

[0014] Further, the sealing ring is composed of a first part and a second part in a ring shape. The first part is composed of a first vertical side, a horizontal side, and a second vertical side from outside to inside and forms a second groove. The second part is in a ring shape and extends inward to the inside of the second vertical side to form a horizontal extension part.

[0015] Further, a first groove for clamping the first vertical side of the sealing ring is provided at the lower end of the second through hole of the top cover sheet, and the inner edge of the second through hole of the top cover sheet is clamped on the second groove of the sealing ring.

[0016] Further, an upward second convex ring is provided at the welding hole of the connecting piece, and an arc chamfer is provided at the contact surface between the bottom of the second convex ring and the connecting piece. The pole column is welded to the inner hole surface of the welding hole of the connecting piece.

[0017] Further, the second part of the sealing ring is located at the gap between the pole column and the second convex ring, and the first convex ring can abut against the sealing ring.

[0018] Further, a positioning rib for positioning the connecting piece is provided on the lower side surface of the lower plastic.

[0019] Further, a ring-shaped connecting edge is provided at the lower side edge of the third through hole of the lower plastic, and a side through hole is provided on the connecting edge.

[0020] Compared with the prior art, the advantages of the present application are as follows:

[0021] 1. By providing a sealing ring with a second groove and a horizontal extension part, the pole column, the connecting piece, the top cover sheet, the upper plastic, and the upper plastic part around the sealing ring are closely attached. And the contact between the above parts is achieved by the rebounding force generated by squeezing the sealing ring after welding the pole column and the connecting piece, thereby improving the resistance yield.

[0022] 2. Through the side through hole of the lower plastic, if the sealing ring is not placed, it can be directly verified whether there is air leakage.

[0023] 3. The lower plastic and the connecting plate are provided with a limiting connecting piece to play a positioning role. Description of the Drawings

[0024] Figure 1 It is a top view schematic diagram of the top cover structure;

[0025] Figure 2 It is an exploded schematic diagram of the top cover structure;

[0026] Figure 3 It is a schematic diagram of the top cover sheet;

[0027] Figure 4It is a schematic diagram of the lower plastic and the connecting piece;

[0028] Figure 5 It is a schematic diagram of the lower plastic

[0029] Figure 6 It is a schematic diagram of the connecting piece

[0030] Figure 7 It is a schematic diagram of the sealing ring

[0031] Figure 8 It is a schematic cross-sectional view of the structure around the sealing ring;

[0032] Figure 9 It is Figure 8 The enlarged view of part A in

[0033] In the figure, 1 is the top cover piece; 101 is the second through hole; 102 is the second cavity; 103 is the first groove; 11 is the pole; 12 is the explosion-proof valve film; 13 is the upper plastic; 131 is the first cavity; 132 is the first convex ring; 14 is the explosion-proof valve; 2 is the sealing ring; 201 is the first vertical side; 202 is the horizontal side; 203 is the second vertical side; 204 is the horizontal extension part; 21 is the second groove; 22 is the first part; 23 is the second part; 3 is the lower plastic; 31 is the third through hole; 311 is the side through hole; 312 is the connecting edge; 32 is the positioning rib; 4 is the connecting piece; 41 is the second convex ring; 411 is the arc chamfer; 42 is the welding hole. Specific embodiments

[0034] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described.

[0035] As Figures 1-9 shown, a battery top cover structure, characterized in that it includes:

[0036] A top cover piece 1, on both sides of the surface of which there are second through holes 101;

[0037] An upper plastic 13, which is installed at the second through hole 101;

[0038] A lower plastic 3, which is located below the top cover piece 1 and the lower plastic 3 is provided with a third through hole 31 corresponding to the second through hole 101 of the top cover piece 1, and a connecting piece 4 is provided below the third through hole 31 of the lower plastic 3;

[0039] A pole 11, which is installed on the upper plastic 13 and the lower end of the pole 11 passes through the second through hole 101 and the third through hole 31 and is fixedly welded to the connecting piece 4;

[0040] A sealing ring 2, which is arranged at the third through hole 31 of the lower plastic 3, and the sealing ring 2 seals the gap at the cooperation of the pole 11 with the connecting piece 4 and the top cover piece 1.

[0041] In the above structure, after the terminal post 11 is welded to the connecting piece 4, a space for placing the sealing ring 2 is formed between the upper plastic 13, the top cover piece 1 and the lower plastic 3. If the sealing ring 2 is not placed in this space, gas will flow through and air leakage will occur.

[0042] Furthermore, an explosion-proof valve 14 is provided in the middle of the top cover piece 1, and an explosion-proof valve film 12 is pasted on the explosion-proof valve 14.

[0043] Furthermore, a first through hole for the end of the terminal post 11 to pass through is provided on the upper plastic 13. The upper plastic 13 also has a first cavity 131 for installing the terminal post 11. A first convex ring 132 is provided on the lower side of the first through hole of the upper plastic 13. The terminal post 11 is installed in the first cavity 131. After the terminal post 11 is welded to the connecting piece 4, pressure will be generated on the upper plastic 13, causing the first convex ring 132 to generate downward pressure to abut against the sealing ring 2.

[0044] Furthermore, a second cavity 102 for installing the upper plastic 13 is provided at the second through hole 101 of the top cover piece 1.

[0045] As Figure 7 shown, furthermore, the sealing ring 2 is composed of a first part 22 and a second part 23 in a ring shape. The first part 22 is composed of a first vertical side 201, a horizontal side 202, and a second vertical side 203 from the outside to the inside and forms a second groove 21. The second part 23 is in a ring shape and extends inwardly of the second vertical side 203 to form a horizontal extension 204. The upper surface of the horizontal extension 204 is higher than or equal to the uppermost surface of the first vertical side 201. The sealing ring 2 is made of a sealing ring material with a Shore hardness of 65 - 75 degrees, and can produce a compression amount of 25% - 45%. The sealing ring 2 is integrally formed. The second groove 21 on the sealing ring enables it to cooperate with the top cover piece 1. The horizontal extension 204 of the sealing ring 2 is located in the gap above the welding joint of the terminal post 11 and the connecting piece 4, and is used to prevent air leakage due to poor welding after the sealing ring 2 is compressed.

[0046] Furthermore, a first groove 103 for the first vertical side 201 of the sealing ring 2 to be embedded is provided at the lower end of the second through hole 101 of the top cover piece 1. The inner edge of the second through hole 101 of the top cover piece 1 is embedded in the second groove 21 of the sealing ring 2. The second part 22 of the sealing ring 2 is used to fill the gap between the terminal post 11 and the connecting piece 4 under the action of the rebound force. The second groove 21 of the sealing ring 2 and the first groove 103 of the top cover piece 1 can make the top cover piece 1 and the sealing ring 2 fit tightly with each other.

[0047] Further, a second convex ring 41 is provided upward at the welding hole 42 of the connecting piece 4, and an arc chamfer 411 is provided on the contact surface between the bottom of the second convex ring 41 and the connecting piece 4. The inner hole surface of the welding hole 42 of the pole 11 and the connecting piece 4 is welded. The arc chamfer 411 is provided so that the gap at this position of the connecting piece 4 can be filled after the sealing ring 2 generates a rebounding force.

[0048] Further, the second part 22 of the sealing ring 2 is located at the gap between the pole 11 and the second convex ring 41, and the first convex ring 132 can abut against the sealing ring 2. The lower end surface of the first convex ring 132 abuts against the top surface of the second vertical side 203.

[0049] Further, a positioning rib 32 for positioning the connecting piece 4 is provided on the lower side surface of the lower plastic 3. The positioning rib 32 is for positioning the connecting piece 4 on the lower plastic 3.

[0050] Further, an annular connecting edge 312 is provided at the lower side edge of the third through hole 31 of the lower plastic 3, and a side through hole 311 is provided on the connecting edge 312. The side through hole 311 can directly verify whether there is air leakage when the sealing ring 2 is not placed.

[0051] The sealing ring 2 is made by calendering or molding. It forms a second groove and a horizontal extension part 204 through the first vertical side 201, the horizontal side 202, and the second vertical side 203. After the pole 11 and the connecting piece 4 are closely fitted and welded, the sealing ring 2 is extruded to generate a rebounding force, making the connections between the top cover piece 1 and the sealing ring 2, between the upper plastic 13 and the sealing ring 2, and between the pole 11 and the connecting piece 4 tighter, meeting the compression amount of the sealing ring 2, so as to achieve a sealing effect. After the pole 11 and the connecting piece 4 are welded, the pole 11 has a certain pressure on the upper plastic 13, so that the first convex ring 132 of the upper plastic 13 abuts against the top surface of the second vertical side 203 of the sealing ring 2 to generate a certain pressure, ensuring the reliability and stability of the resistance.

[0052] In this embodiment, there is one positive pole 11 and one negative pole 11 for the pole 11, and the corresponding welded ones are one positive connecting piece 4 and one negative connecting piece 4.

[0053] Regarding the technical solution of the present utility model above, in view of the technical problem that the prior art solution is too single, a solution significantly different from the prior art is provided. The parts not involved in the technical solution of this application are the same as the prior art or can be implemented by the prior art, and will not be elaborated here.

[0054] The technical solutions in the above embodiments have clearly and completely described the content of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

Claims

1. A battery top cover structure, characterized in that, It includes: A top cover sheet with second through holes opened on both sides of its surface; An upper plastic, which is installed at the second through holes; A lower plastic, which is located below the top cover sheet and the third through holes corresponding to the second through holes of the top cover sheet are opened on the lower plastic, and a connecting piece is provided below the third through holes of the lower plastic; A pole column, which is installed on the upper plastic and the lower end of the pole column passes through the second through hole and the third through hole and is welded and fixed to the connecting piece; A sealing ring, which is arranged at the third through holes of the lower plastic, and the sealing ring seals the gap at the mating part of the pole column with the connecting piece and the top cover sheet.

2. The battery top cover structure according to claim 1, wherein: An explosion-proof valve is provided in the middle of the top cover sheet, and an explosion-proof valve film is pasted on the explosion-proof valve.

3. The battery top cover structure according to claim 1, characterized in that: A first through hole for the end of the pole column to pass through is opened on the upper plastic, and a first cavity for installing the pole column is also provided on the upper plastic. A first convex ring is provided on the lower side of the first through hole of the upper plastic.

4. A battery top cover structure according to claim 1, characterized in that: A second cavity for installing the upper plastic is provided at the second through holes of the top cover sheet.

5. A battery top cover structure according to claim 3, characterized in that The sealing ring is composed of a first part and a second part in a ring shape. The first part is composed of a first vertical side, a horizontal side, and a second vertical side from outside to inside and forms a second groove. The second part is in a ring shape and extends inward to the second vertical side to form a horizontal extension part.

6. A battery top cover structure according to claim 5, characterized in that, A first groove for the first vertical side of the sealing ring to be clamped is provided at the lower end of the second through hole of the top cover sheet, and the inner edge of the second through hole of the top cover sheet is clamped on the second groove of the sealing ring.

7. A battery top cover structure according to claim 6, characterized in that, A second convex ring is provided upward at the welding hole of the connecting piece, and an arc chamfer is provided at the contact surface between the bottom of the second convex ring and the connecting piece. The inner hole surface of the welding hole of the pole column and the connecting piece is welded.

8. A battery top cover structure according to claim 7, characterized in that, The second part of the sealing ring is located at the gap between the pole column and the second convex ring, and the first convex ring can abut against the sealing ring.

9. A battery top cover structure according to claim 1, characterized in that, A positioning rib for positioning the connecting piece is provided on the lower side surface of the lower plastic.

10. A battery top cover structure according to claim 9, characterized in that, A circular connecting edge is provided at the lower side edge of the third through hole of the lower plastic, and side through holes are opened on the connecting edge.

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