Square aluminum shell battery cover plate

Abstract

The utility model relates to the technical field of aluminum shell battery cover plates, and discloses a square aluminum shell battery cover plate which comprises a base plate, a positive electrode upper insulation pad and a negative electrode upper insulation pad are respectively mounted at two ends of the upper surface of the base plate, an anti-explosion valve patch is mounted in the middle of the upper surface of the base plate, and one side surface, far away from the base plate, of the positive electrode upper insulation pad is connected with an upper pressing plate I; the side face, away from the substrate, of the negative electrode upper insulation pad is connected with a second upper pressing plate, a sealing ring is installed on the lower surface of the substrate, and an anti-explosion piece is installed on the lower surface, close to the anti-explosion valve patch, of the substrate. A lower insulation pad II is mounted on the lower surface of one end, close to the negative upper insulation pad, of the sealing ring, a negative column is connected to the lower surface of the lower insulation pad II, a lower insulation pad I is mounted on the lower surface of one end, close to the positive upper insulation pad, of the sealing ring, and a positive column is connected to the lower surface of the lower insulation pad I; through cooperation of the structure, corrosion caused by contact with electrolyte can be reduced, and the yield of products is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of aluminum-cased battery cover plates, specifically a square aluminum-cased battery cover plate. Background Technology

[0002] The top cover is a crucial protective device in cases of puncture, thermal runaway, and fire. It reduces overcurrent and the likelihood of the flip-over plate melting, thus preventing the power battery from catching fire or exploding and effectively reducing the risk. Currently, lithium battery explosion-proof methods typically include two types: circuit breaking protection and pressure relief protection. Circuit breaking protection involves setting a special circuit breaking weld between the sealing plate and the electrode core inside the battery. When the internal gas pressure increases to a certain value due to gas generation, the sealing plate deforms under pressure, and the weld between it and the electrode core breaks, completely severing the circuit. Pressure relief protection involves installing an explosion-proof plate on the battery's sealing body. When the internal gas pressure rises to the opening pressure of the explosion-proof valve, the explosion-proof plate ruptures at the scored point and releases pressure, thereby preventing an explosion.

[0003] In the past, the main focus of cover plates was on explosion-proof and pressure relief, with treatment mainly done on explosion-proof valves. However, the insulation design structure was often neglected, which allowed the electrolyte to come into contact with other parts of the cover plate, leading to corrosion. This, in turn, affected the structural integrity and sealing performance of the cover plate, thus impacting the product yield.

[0004] Therefore, we propose a square aluminum battery cover. Utility Model Content

[0005] The purpose of this utility model is to provide a square aluminum battery cover plate in order to reduce corrosion caused by contact with electrolyte and improve product yield.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A square aluminum-cased battery cover includes a substrate. A positive electrode upper insulating pad and a negative electrode upper insulating pad are respectively installed at both ends of the upper surface of the substrate. An explosion-proof valve patch is installed in the middle of the upper surface of the substrate. An upper pressure plate one is connected to the side of the positive electrode upper insulating pad away from the substrate, and an upper pressure plate two is connected to the side of the negative electrode upper insulating pad away from the substrate. A sealing ring is installed on the lower surface of the substrate, and an explosion-proof sheet is installed on the lower surface of the substrate near the explosion-proof valve patch.

[0008] A second lower insulating pad is installed on the lower surface of the sealing ring near the upper insulating pad of the negative electrode. The lower surface of the second lower insulating pad is connected to the negative electrode post. A first lower insulating pad is installed on the lower surface of the sealing ring near the upper insulating pad of the positive electrode. The lower surface of the first lower insulating pad is connected to the positive electrode post.

[0009] In a preferred embodiment of the invention, the weld penetration depth of the positive electrode and the negative electrode is ≥0.5mm.

[0010] In a preferred embodiment of the invention, the torque in the X / Y / Z axes of the positive and negative terminals is not less than 6 N·m.

[0011] In a preferred embodiment of the invention, the first and second lower insulating pads are made of black flame-retardant modified PP.

[0012] In a preferred embodiment of the invention, the insulating pad on the positive electrode is made of black PPS, and the insulating pad on the negative electrode is made of brown PPS.

[0013] In a preferred embodiment of the invention, the explosion-proof valve patch is made of white transparent PET.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0015] In this invention, when the battery ruptures and releases pressure during an internal reaction, the lower insulating pads one and two are made of modified fire-retardant PP material, possessing excellent insulation properties. This insulation effectively isolates the explosion-proof valve from direct contact with the electrolyte and also exhibits good corrosion resistance to various chemicals. In corrosive environments such as electrolytes, the pads remain stable and are not easily corroded, thus protecting the explosion-proof valve from damage. This allows the lower insulating pads one and two to minimize corrosion caused by contact between the explosion-proof valve and the electrolyte, providing a certain degree of protection for the explosion-proof valve. The combination of these structures reduces corrosion caused by contact with the electrolyte, improving product yield. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present utility model;

[0017] Figure 2 This is an exploded view of the present invention;

[0018] Figure 3 This is a top view of the sealing ring in this utility model.

[0019] The markings in the diagram are: 1-substrate, 2-explosion-proof valve patch, 3-positive electrode upper insulating pad, 4-negative electrode upper insulating pad, 5-upper pressure plate one, 6-upper pressure plate two, 7-explosion-proof sheet, 8-sealing ring, 9-lower insulating pad one, 10-lower insulating pad two, 11-positive electrode post, 12-negative electrode post. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] The following will combine Figures 1-3 A detailed description of a square aluminum battery cover according to an embodiment of the present invention is provided.

[0022] Reference Figure 1-3 , Example

[0023] Reference Figures 1-3 A square aluminum-cased battery cover includes a substrate 1. A positive electrode upper insulating pad 3 and a negative electrode upper insulating pad 4 are respectively installed at both ends of the upper surface of the substrate 1. An explosion-proof valve patch 2 is installed in the middle of the upper surface of the substrate 1. An upper pressure plate 5 is connected to the side of the positive electrode upper insulating pad 3 away from the substrate 1, and an upper pressure plate 6 is connected to the side of the negative electrode upper insulating pad 4 away from the substrate 1. A sealing ring 8 is installed on the lower surface of the substrate 1, and an explosion-proof sheet 7 is installed on the lower surface of the substrate 1 near the explosion-proof valve patch 2. A lower insulating pad 10 is installed on the lower surface of the sealing ring 8 near the negative electrode upper insulating pad 4, and a negative electrode post 12 is connected to the lower surface of the lower insulating pad 10. A lower insulating pad 9 is installed on the lower surface of the sealing ring 8 near the positive electrode upper insulating pad 3, and a positive electrode post 11 is connected to the lower surface of the lower insulating pad 9. The lower insulating pad 9 and the lower insulating pad 2 10 are made of black flame-retardant modified PP. Specifically, when the battery ruptures and releases pressure during an internal reaction, the lower insulating pad 9 and the lower insulating pad 2 10, made of modified fire-resistant PP material, have excellent insulation properties. This insulation effectively isolates the explosion-proof sheet from direct contact with the electrolyte and has good corrosion resistance to various chemicals. In corrosive environments such as electrolytes, the pads remain stable and are not easily corroded, thus protecting the explosion-proof valve from damage. This allows the lower insulating pad 9 and the lower insulating pad 2 10 to minimize corrosion caused by contact between the explosion-proof sheet 7 and the electrolyte, providing a certain degree of protection for the explosion-proof valve. The combination of the above structures can reduce corrosion caused by contact with the electrolyte and improve product yield.

[0024] Reference Figures 1-3The welding penetration depth of the positive electrode post 11 and the negative electrode post 12 is ≥0.5mm, and the torque in the X / Y / Z axis directions of the positive electrode post 11 and the negative electrode post 12 is not less than 6N.M. The insulating pad 3 on the positive electrode is made of black PPS, the insulating pad 4 on the negative electrode is made of brown PPS, and the explosion-proof valve patch 2 is made of white transparent PET. Specifically, PPS material has excellent electrolyte resistance, which can effectively resist the corrosion of battery liquid and protect the positive and negative electrodes from damage. Moreover, PPS material has excellent electrical insulation properties. As an insulating pad, it can ensure electrical isolation between the positive and negative electrodes, prevent electrical corrosion and breakdown, and improve the safety of the battery system.

[0025] The implementation principle of a square aluminum-cased battery cover plate embodiment of this application is as follows:

[0026] When the battery ruptures and releases pressure during an internal reaction, the lower insulating pads 9 and 10, made of modified fire-resistant PP material, possess excellent insulation properties. This insulation effectively isolates the explosion-proof valve from direct contact with the electrolyte and exhibits good corrosion resistance to various chemicals. In corrosive environments such as electrolytes, the pads remain stable and are not easily corroded, thus protecting the explosion-proof valve from damage. The lower insulating pads 9 and 10 minimize corrosion caused by contact between the explosion-proof valve 7 and the electrolyte, providing a certain degree of protection for the explosion-proof valve. The combination of these structures reduces corrosion caused by contact with the electrolyte, improving product yield.

[0027] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A square aluminum-cased battery cover, comprising a substrate (1), characterized in that: The upper surface of the substrate (1) is provided with a positive electrode upper insulating pad (3) and a negative electrode upper insulating pad (4) respectively. An explosion-proof valve patch (2) is provided in the middle of the upper surface of the substrate (1). An upper pressure plate (5) is connected to the side of the positive electrode upper insulating pad (3) away from the substrate (1). An upper pressure plate (6) is connected to the side of the negative electrode upper insulating pad (4) away from the substrate (1). A sealing ring (8) is provided on the lower surface of the substrate (1). An explosion-proof sheet (7) is provided on the lower surface of the substrate (1) near the explosion-proof valve patch (2). The sealing ring (8) has a lower insulating pad (10) installed on the lower surface of the end near the upper insulating pad (4) of the negative electrode. The lower surface of the lower insulating pad (10) is connected to the negative electrode post (12). The sealing ring (8) has a lower insulating pad (9) installed on the lower surface of the end near the upper insulating pad (3) of the positive electrode. The lower surface of the lower insulating pad (9) is connected to the positive electrode post (11).

2. The square aluminum battery cover plate as described in claim 1, characterized in that: The welding penetration depth of the positive electrode (11) and the negative electrode (12) is ≥0.5mm.

3. The square aluminum battery cover plate as described in claim 1, characterized in that: The torque in the X / Y / Z axis directions of the positive terminal (11) and the negative terminal (12) is not less than 6 N.M.

4. A square aluminum-cased battery cover as described in claim 1, characterized in that: The lower insulating pad one (9) and the lower insulating pad two (10) are made of black flame-retardant modified PP.

5. A square aluminum battery cover as described in claim 4, characterized in that: The insulating pad (3) on the positive electrode is made of black PPS, and the insulating pad (4) on the negative electrode is made of brown PPS.

6. A square aluminum battery cover as described in claim 1, characterized in that: The explosion-proof valve patch (2) is made of white transparent PET.

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