Novel structure of lithium battery cover plate

Abstract

The utility model discloses a new structure of a lithium battery cover plate, which relates to the technical field of lithium battery cover plates, aims to solve the technical problem that a connecting piece is easy to shift during laser welding, and comprises an insulating support consisting of an insulating frame upper plate and an insulating frame lower plate, a plurality of through cavity openings are formed in the insulating frame upper plate and the insulating frame lower plate, and the cavity openings are communicated with the insulating frame upper plate and the insulating frame lower plate. An upper connecting piece is arranged above the insulating frame upper plate, an insulating spacer is arranged on the periphery of the upper connecting piece, a fluororubber sealing ring matched with the cavity opening is arranged at the position, connected with the upper connecting piece, of the bottom of the insulating spacer, a lower connecting piece is oppositely arranged on one side of the upper connecting piece, and a locking structure is arranged between the lower connecting piece and the upper connecting piece. According to the utility model, through the corresponding positions of the upper connecting sheet and the lower connecting sheet, the convex hull step structures of the upper connecting sheet and the lower connecting sheet, and the matching of the bosses and the through holes, riveting is added before laser welding, so that the welding stability is improved, and meanwhile, the connecting strength is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery cover plates, and more specifically to a new structure of a lithium battery cover plate. Background Art

[0002] The lithium battery cover is a top cover in a power lithium battery assembly. Its primary purpose is to prevent excessive internal pressure in the battery, acting as an explosion-proof plate. It is a critical component in power batteries. Existing lithium battery cover plates are typically laser welded to secure the positive and negative connectors during processing. However, due to their thinness and light weight, the positive and negative connectors can sometimes shift during laser welding, affecting weld quality. To address this, we propose a new lithium battery cover structure. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the existing technology, meet the actual needs, and provide a new structure of a lithium battery cover to solve the technical problem that the connecting piece is easily offset during the current laser welding.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a new structure of a lithium battery cover plate, comprising an insulating bracket consisting of an insulating frame upper plate and an insulating frame lower plate, wherein the insulating frame upper plate and the insulating frame lower plate are provided with a plurality of through cavities, an upper connecting plate is provided above the insulating frame upper plate, an insulating gasket is provided on the outer periphery of the upper connecting plate, a fluororubber sealing ring adapted to the cavity is provided at the bottom of the insulating gasket at the connection position of the upper connecting plate, a lower connecting plate is provided opposite to one side of the upper connecting plate, and a locking structure is provided between the lower connecting plate and the upper connecting plate.

[0005] Preferably, the upper connecting piece includes an upper pressing block aluminum layer and an upper pressing block copper layer, the upper pressing block copper layer is located on a side close to the lower connecting piece, and the lower connecting piece is made of copper.

[0006] Preferably, the locking structure includes a plurality of convex steps, and the plurality of convex steps are provided on the upper connecting piece or the lower connecting piece in an integrally formed manner, and the convex steps on the upper connecting piece and the lower connecting piece are arranged on adjacent sides.

[0007] Preferably, a boss is formed at the center of the convex step on the copper layer of the upper pressing block, and a riveting cavity with a reversed triangular cross section is punched in the middle of the boss.

[0008] Preferably, a through hole is punched at the center of the convex step of the lower connecting piece, and a recessed area is opened on one side of the through hole.

[0009] Preferably, the boss passes through the through hole, and the flange portion of the boss after riveting and curling is located in the recessed area.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] 1. The utility model realizes the position correspondence between the upper and lower connecting pieces and the convex step structure of the upper and lower connecting pieces, and the adaptation of the boss and the through hole so that the boss can pass through the through hole. Combined with the riveting cavity design of the boss with an inverted triangle, it can be stamped and curled to constrain the position of the upper and lower connecting pieces, thereby achieving a limiting effect and solving the problem of easy displacement of the connecting piece during laser welding.

[0012] 2. The utility model can also play an anti-electric effect through the design of the insulating gasket and the fluororubber sealing ring. The design of the recessed area allows the fixed flange to sink into the lower connecting piece, further facilitating subsequent work and further solving the problem of the flange protrusion affecting subsequent processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the utility model in the connected state;

[0014] Figure 2 It is a top view of the utility model in the connected state;

[0015] Figure 3 It is a bottom view of the utility model in the connected state;

[0016] Figure 4 This is a schematic diagram of the overall split structure of the utility model;

[0017] Figure 5 This is a diagram showing the position of the locking structure of the present invention;

[0018] Figure 6 This is a schematic diagram of a half-section structure of the upper connecting piece of the present invention;

[0019] Figure 7 It is a structural schematic diagram of the lower connecting piece of the utility model in an inverted state.

[0020] Explanation of the reference numbers in the figure: 1. Insulation bracket; 101. Insulation bracket upper plate; 102. Insulation bracket lower plate; 2. Upper connecting piece; 201. Upper pressing block aluminum layer; 202. Upper pressing block copper layer; 3. Insulation gasket; 4. Fluororubber sealing ring; 5. Lower connecting piece; 6. Locking structure; 7. Laser welding point;

[0021] 601, convex step; 602, boss; 603, through hole; 604, recessed area. DETAILED DESCRIPTION

[0022] like Figures 1 to 7As shown, the utility model relates to a new structure of a lithium battery cover plate, including an insulating bracket 1, which is composed of an insulating bracket upper plate 101 and an insulating bracket lower plate 102. The insulating bracket upper plate 101 and the insulating bracket lower plate 102 are fixed by riveting or fasteners. An upper connecting piece 2 is provided above the insulating bracket upper plate 101, and a lower connecting piece 5 is provided on one side of the upper connecting piece 2. A plurality of through cavities are provided on the insulating bracket upper plate 101 and the insulating bracket lower plate 102. The energized parts of the lower connecting piece 5 and the upper connecting piece 2 pass through the cavities and contact each other. The lower connecting piece 5 is made of copper. The upper connecting piece 2 includes an upper pressing block aluminum layer 201 and an upper pressing block copper layer 202. The upper pressing block copper layer 202 is located on the side close to the lower connecting piece 5. Copper has better conductivity and heat resistance, so the contact side uses copper. Since copper is more valuable, the upper connecting piece 2 uses the upper pressing block aluminum layer 201 and the upper pressing block copper layer 202, which saves resources.

[0023] In order to achieve electric current prevention on the sides of the lower connecting piece 5 and the upper connecting piece 2, an insulating gasket 3 is provided on the outer periphery of the upper connecting piece 2. A fluororubber sealing ring 4 adapted to the cavity opening is provided at the bottom of the insulating gasket 3 at the connection position of the upper connecting piece 2. Adaptation refers to the contact and fit between the fluororubber sealing ring 4 and the outer and inner walls of the cavity opening.

[0024] In order to make the laser welding more stable, a locking structure 6 is provided between the lower connecting piece 5 and the upper connecting piece 2. The locking structure 6 includes a plurality of convex steps 601. The plurality of convex steps 601 are provided on the upper connecting piece 2 or the lower connecting piece 5 in an integrally formed manner. The integrally formed manner can be adopted, for example, by stamping or casting. The convex steps 601 are located at the position of the cavity mouth. The convex steps 601 on the upper connecting piece 2 and the lower connecting piece 5 are arranged on adjacent sides. The center of the convex step 601 on the copper layer 202 of the upper pressing block is deep-drawn to provide a boss 602. A section is punched in the middle of the boss 602. The surface is a riveting cavity with an inverted triangle, and a through hole 603 is punched in the center of the convex step 601 of the lower connecting piece 5. A recessed area 604 is opened on one side of the through hole 603, and the boss 602 passes through the through hole 603. The flange part of the boss 602 after riveting and curling is in the recessed area 604. When the riveting cavity with an inverted triangle is formed by using a punch with an intermittent round head, the punch descends and presses the center of the riveting cavity. The side of the riveting cavity will be squeezed outward and the flange will be in the recessed area 604 to achieve riveting fixation. After riveting, laser welding is used to achieve fixation through the laser welding point 7.

[0025] Working principle: This embodiment provides a new structure of a lithium battery cover. During processing, the positions of the components between the upper connecting plate 2 and the lower connecting plate 5 are installed by manual and mechanical automatic equipment. The multiple bosses 602 at the bottom of the upper connecting plate 2 pass through the cavity opening and the through hole 603 in sequence. The external punch rivets the riveting cavity of the boss 602 to turn the riveting cavity outward, and its flange is in the concave area, which can complete the position constraint of the two connecting plates. Then laser welding is used, and the connection can be completed through multiple laser welding points 7 before passing current.

[0026] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A new structure of lithium battery cover, characterized in that: The invention comprises an insulating support (1) composed of an insulating support upper plate (101) and an insulating support lower plate (102), wherein the insulating support upper plate (101) and the insulating support lower plate (102) are provided with a plurality of through cavities, an upper connecting plate (2) is provided above the insulating support upper plate (101), an insulating gasket (3) is provided on the periphery of the upper connecting plate (2), a fluororubber sealing ring (4) adapted to the cavity is provided at the bottom of the insulating gasket (3) at the connection position of the upper connecting plate (2), a lower connecting plate (5) is provided on one side of the upper connecting plate (2), and a locking structure (6) is provided between the lower connecting plate (5) and the upper connecting plate (2).

2. A new lithium battery cover structure according to claim 1, characterized in that: The upper connecting piece (2) comprises an upper pressing block aluminum layer (201) and an upper pressing block copper layer (202), wherein the upper pressing block copper layer (202) is located on a side close to the lower connecting piece (5), and the lower connecting piece (5) is made of copper.

3. A new lithium battery cover structure according to claim 2, characterized in that: The locking structure (6) comprises a plurality of convex steps (601), and the plurality of convex steps (601) are arranged on the upper connecting piece (2) or the lower connecting piece (5) in an integrally formed manner, and the convex steps (601) on the upper connecting piece (2) and the lower connecting piece (5) are arranged on adjacent sides.

4. A new lithium battery cover structure according to claim 3, characterized in that: A boss (602) is formed by deep drawing at the center of the convex step (601) on the copper layer (202) of the upper pressing block, and a riveting cavity with a reversed triangular cross section is punched in the middle of the boss (602).

5. A new lithium battery cover structure according to claim 4, characterized in that: A through hole (603) is punched in the center of the convex step (601) of the lower connecting piece (5), and a recessed area (604) is opened on one side of the through hole (603).

6. A new lithium battery cover structure according to claim 5, characterized in that: The boss (602) passes through the through hole (603), and the flanged portion of the boss (602) after riveting and curling is located in the recessed area (604).

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