Secondary battery top cover

Abstract

The utility model provides a secondary battery top cover which comprises a top cover plate, lower plastic cement and pole columns, the lower plastic cement is arranged at the bottom end of the top cover plate, the pole columns are arranged at the two ends of the top cover plate, convex parts are arranged at the bottom ends of the pole columns, and the bottom end faces of the convex parts protrude out of the top end face of the lower plastic cement; according to the utility model, the convex part is arranged, so that the bottom end of the pole protrudes out of the bottom end surface of the lower plastic, and when the connecting sheet is positioned at the bottom end of the lower plastic and is welded with the pole, a gap is formed between the connecting sheet and the lower plastic, heat generated by welding cannot be directly diffused to the lower plastic contacted with the pole, and various performances of the lower plastic cannot be influenced; and the lower plastic cannot be melted, so that the phenomenon of liquid leakage or pole falling is avoided, and the safety is high.

Description

Technical Field

[0001] The utility model relates to the field of lithium ion batteries, in particular to a secondary battery top cover. Background Art

[0002] The packaging forms of power lithium battery cells are divided into three types: square shell cells, soft pack cells, and cylindrical cells. Hard shell cells are usually assembled with an aluminum alloy shell and a top cover. The top cover is a more important part of the hard shell cell. Currently, there are many kinds of power battery top covers, and their reliability and economy directly determine the degree of their promotion.

[0003] In the prior art, the pole of the top cover is generally welded to the pole by welding a connecting piece, which is located at the bottom of the lower plastic and welded to the pole. The heat generated by the welding directly diffuses to the lower plastic in contact with the pole, thereby affecting various properties of the lower plastic. The melting of the lower plastic may cause leakage or the pole to fall off, resulting in poor safety.

[0004] To this end, we propose a secondary battery top cover to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a secondary battery top cover.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A secondary battery top cover comprises a top cover plate, a lower plastic and a pole, wherein the bottom end of the top cover plate is provided with the lower plastic, and poles are provided at both ends of the top cover plate, and the bottom ends of the poles are provided with convex parts, the bottom end surfaces of the convex parts protrude from the top end surface of the lower plastic, and reinforcing ribs are provided around the edge of the bottom end of the lower plastic.

[0008] Further preferably, both ends of the top cover plate are provided with penetrating pole holes, and the poles all penetrate the pole holes.

[0009] Further preferably, the top of each pole is provided with an upper plastic, and the upper plastic is formed by injection molding.

[0010] Further preferably, a sealing ring is provided at the bottom end of each pole, and the sealing ring is fixed to the pole by a snap-fitting manner.

[0011] Further preferably, an insulating gasket is provided between the top cover plate and the lower plastic.

[0012] Further preferably, the sealing rings are all located in the pole grooves.

[0013] Further preferably, the insulating gasket is located below the pole slot, and the insulating gasket is sleeved on the outside of the pole.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] In the utility model, the convex part is provided so that the bottom end of the pole protrudes from the bottom end surface of the lower plastic. When the connecting piece is located at the bottom end of the lower plastic and is welded to the pole, a gap will be generated between the connecting piece and the lower plastic. The heat generated by the welding will not directly diffuse to the lower plastic in contact with the pole, and will not affect the various properties of the lower plastic. The lower plastic will not melt, and will not cause leakage or pole falling off, thereby having strong safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the explosion structure of a secondary battery top cover provided by the utility model;

[0017] Figure 2 A schematic diagram of the cross-sectional structure of a secondary battery top cover provided by the utility model;

[0018] Figure 3 for Figure 2 A schematic diagram of the enlarged structure in the middle.

[0019] In the figure: 1. Top cover plate; 2. Lower plastic; 3. Pole; 4. Upper plastic; 5. Sealing ring; 6. Insulating gasket; 7. Pole hole; 8. Protrusion; 9. Reinforcing rib. DETAILED DESCRIPTION

[0020] Reference Figure 1-Figure 3 A secondary battery top cover comprises a top cover plate 1, a lower plastic 2 and a pole 3. The bottom end of the top cover plate 1 is provided with a lower plastic 2, and the lower plastic 2 can be connected and fixed to the top cover plate 1 by means of snap connection, welding and screw fixing. The top cover plate 1 is provided with poles 3 at both ends.

[0021] By providing the convex portion 8, the convex portion 8 at the bottom end of the pole 3 protrudes from the bottom end surface of the lower plastic 2. When the connecting piece is located at the bottom end of the lower plastic 2 and is welded to the pole 3, a gap will be generated between the connecting piece and the lower plastic 2. The heat generated by welding will not directly diffuse to the lower plastic 2 in contact with the pole 3, and will not affect the various properties of the lower plastic 2. The lower plastic 2 will not melt, and will not cause leakage or the pole 3 to fall off, thereby having strong safety.

[0022] The top cover plate 1 is provided with through pole holes 7 at both ends, and the pole holes 7 are stepped. The stepped pole holes 7 can increase the contact area between the pole 3 and the pole holes 7, and can improve the stability of the pole 3 after installation. The poles 3 all pass through the pole holes 7. The pole holes 7 are stepped, and the poles 3 can be stuck inside the pole holes 7, which can facilitate the installation of the poles 3.

[0023] The top of each pole 3 is provided with an upper plastic 4, which is formed by injection molding. There are two ways to install the upper plastic 44 on the top cover plate 11;

[0024] The first method is to first install the sealing ring 5 and the pole 3 in the pole hole 7 respectively, and then fix the sealing ring 5 and the pole 3 by injection molding the upper plastic 4, and then weld the connecting piece and the top cover plate 1, so that the upper plastic 4 is not easily melted due to welding or affected by welding slag;

[0025] The second method is to first install the sealing ring 5 and the pole 3 in the pole hole 7, and then fix the connecting piece and the top cover piece 1 by welding, and then perform injection molding on the upper plastic 4. At this time, the welding slag generated by welding will not affect the upper plastic 4.

[0026] The bottom end of each pole 3 is provided with a sealing ring 5, which is fixed to the pole 3 by a snap-on method. The sealing ring 5 is preferably made of insulating rubber material, which can effectively prevent leakage, and the outer surface of the sealing ring 5 is relatively rough, which can increase the friction of the sealing ring 5 and effectively prevent the sealing ring 5 from falling off. The sealing ring 5 is above the bottom end of the pole 3 and the pole hole 7. After installation, the sealing ring 5 is in a compressed state and can be stably fixed by the squeezing force of the pole 3 and the pole hole 7. The sealing ring 5 is located in the groove of the pole 3, so that the sealing ring 5 can be effectively limited and fixed.

[0027] A reinforcing rib 9 is arranged around the bottom edge of the lower plastic 2 , and the reinforcing rib 9 can effectively improve the strength of the lower plastic 2 .

Claims

1. A secondary battery top cover, comprising a top cover plate, a lower plastic and a pole, wherein the bottom end of the top cover plate is provided with a lower plastic, and the two ends of the top cover plate are provided with poles, characterized in that: The bottom end of each pole is provided with a convex portion, the bottom end surface of the convex portion protrudes from the top end surface of the lower plastic, and a reinforcing rib is arranged around the edge position of the bottom end of the lower plastic.

2. A secondary battery top cover according to claim 1, characterized in that: Both ends of the top cover plate are provided with penetrating pole holes, and the poles all penetrate the pole holes.

3. A secondary battery top cover according to claim 1, characterized in that: The top of the pole is provided with upper plastic, and the upper plastic is formed by injection molding.

4. A secondary battery top cover according to claim 2, characterized in that: The bottom ends of the poles are all provided with sealing rings, which are fixed to the poles by means of clamping.

5. The secondary battery top cover according to claim 1, characterized in that: An insulating gasket is provided between the top cover plate and the lower plastic.

6. A secondary battery top cover according to claim 4, characterized in that: The sealing rings are all located in the pole grooves.

7. A secondary battery top cover according to claim 5, characterized in that: The insulating gaskets are located below the pole slots, and are sleeved on the outside of the poles.

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