Battery cell cover plate capable of being prevented from being polluted

Abstract

The utility model provides a battery cell cover plate capable of being prevented from being polluted. The battery cell cover plate comprises a cover plate body and a protective film, a protective film is arranged on the upper surface of the cover plate body, and the size and the shape of the protective film are matched with those of the cover plate body. According to the utility model, the cover plate body and the protective film are arranged, and the protective film is arranged on the cover plate body, so that the battery cell cover plate can be prevented from being polluted by electrolyte.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cell cover plate that can prevent contamination. Background Technology

[0002] Rust prevention is a major challenge for steel-cased battery cells. Reducing contamination of the casing can effectively prevent steel-cased battery cells from rusting. Strict control is required during the manufacturing process for battery cells. Electrolyte on the steel casing can easily corrode the steel casing and damage the nickel plating layer. The nickel plating layer at the reinforcing ribs of the cover plate is relatively thin and is prone to rusting in environments without environmental dew point.

[0003] The existing battery electrolyte filling process suffers from problems such as long filling time, poor sealing of the filling nozzle, low vacuum and high leakage rate, and low filling accuracy. In particular, during the process of injecting electrolyte into the battery filling port using the filling nozzle, the filling nozzle cannot be fully compatible with the movement of the fixture, resulting in electrolyte leakage and splashing. The electrolyte contaminates the battery casing around the filling port, directly affecting the welding seal of the filling port. Furthermore, a slight deviation between the filling nozzle and the cell filling port can cause differential pressure, resulting in the scrapping of the cell and seriously affecting the battery production efficiency.

[0004] In the existing formation process, most steel-cased cells are formed under negative pressure. During the formation process, the negative pressure nozzle comes into contact with the injection hole. The cell core expands during the formation and charging process, and the electrolyte is drawn out by the negative pressure. There is electrolyte between the negative pressure nozzle and the injection hole. After formation, there will be residual electrolyte around the injection hole, which will cause the steel-cased cell cover to be contaminated by the electrolyte. Utility Model Content

[0005] The technical problem to be solved by this utility model is how to prevent the battery cell cover from being contaminated by electrolyte.

[0006] This utility model solves the above-mentioned technical problems through the following technical means:

[0007] A cell cover plate that can prevent contamination includes a cover plate body (1) and a protective film (2); the upper surface of the cover plate body (1) is provided with a protective film (2), and the size and shape of the protective film (2) are adapted to the cover plate body (1).

[0008] Beneficial effects: By setting up the cover plate body and the protective film, the protective film on the cover plate body can prevent the battery cell cover plate from being contaminated by electrolyte.

[0009] Furthermore, the material of the protective film (2) has resistance to electrolyte corrosion and high temperature resistance.

[0010] Furthermore, the material of the protective film (2) does not deform within the range of 0-80°C.

[0011] Beneficial effects: By setting the properties of the protective film material, the protective film can be tightly bonded to the cover plate body without gaps.

[0012] Furthermore, the viscosity of the protective film (2) is greater than 30 MPa.

[0013] Furthermore, the thickness of the protective film (2) is between 0.05mm and 10mm, and the thickness of the protective film (2) is less than the thickness of the cover plate body (1).

[0014] Furthermore, the diameter of the protective film (2) is smaller than the diameter of the cover plate body (1), and the protective film (2) after being attached does not exceed the boundary of the cover plate body (1).

[0015] Furthermore, an injection hole (11) is provided at the center of the cover plate body (1), and a protective film (2) is fixed on the upper surface of the cover plate body (1). An avoidance hole (21) is provided on the protective film (2) near the injection hole (11).

[0016] Furthermore, the cover plate body (1) is disc-shaped, and the upper surface of the cover plate body (1) is provided with multiple rings of protrusions spaced around the injection hole (11) as the center. The upper surface of the protective film (2) is provided with multiple rings of protrusions spaced around the avoidance hole (21) as the center. The number and size of the protrusions of the protective film (2) are adapted to the number and size of the protrusions of the cover plate body (1).

[0017] Furthermore, the upper surface of the cover plate body (1) is provided with three rings of protrusions spaced apart around the injection hole (11), and the upper surface of the protective film (2) is provided with three rings of protrusions spaced apart around the avoidance hole (21).

[0018] Furthermore, the cover plate body (1) is made of steel plated with nickel. Attached Figure Description

[0019] Figure 1 This is a perspective view of the cell cover plate that can prevent contamination according to Embodiment 1 of the present invention.

[0020] Figure 2 This is an exploded view of the battery cell cover plate that can prevent contamination according to Embodiment 1 of this utility model. Detailed Implementation

[0021] 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.

[0022] Example 1

[0023] like Figure 1 As shown, this embodiment provides a battery cell cover that can prevent contamination, including a cover body 1 and a protective film 2.

[0024] like Figure 1 , Figure 2 As shown, the cover plate body 1 is disc-shaped, with an injection hole 11 at its center. Multiple concentric rings of protrusions are arranged around the injection hole 11 on the upper surface of the cover plate body 1. In this embodiment, three concentric rings of protrusions are arranged around the injection hole 11 on the upper surface of the cover plate body 1. The cover plate body 1 is made of nickel-plated steel. A protective film 2 is fixed to the upper surface of the cover plate body 1. In this embodiment, when applying the film, the cover plate body 1 is baked. When the temperature drops to 35-55°C, the surface of the cover plate body 1 is blown clean with an air knife, and then the surface of the cover plate body 1 is cleaned with plasma. The protective film 2 is then attached to the plasma-cleaned cover plate body 1, ensuring a tight and seamless fit between the protective film 2 and the cover plate body 1. A clearance hole 21 is provided near the injection hole 11 on the membrane 2. Three rings of protrusions are arranged around the clearance hole 21 on the upper surface of the protective membrane 2. The protrusions of the protective membrane 2 are adapted to the protrusions of the cover plate body 1. The diameter of the protective membrane 2 is smaller than the diameter of the cover plate body 1. The protective membrane 2 after being attached cannot exceed the boundary of the cover plate body 1. The material of the protective membrane 2 has the properties of resistance to electrolyte corrosion and high temperature resistance. It does not deform within the range of 0-80℃. The viscosity of the protective membrane 2 is greater than 30Mpa. The thickness of the protective membrane 2 is between 0.05mm and 10mm. The thickness of the protective membrane 2 is less than the thickness of the cover plate body 1. During the injection and formation process, the residual liquid on the contact surface between the nozzle and the cover plate body 1 drips onto the protective membrane 2 and cannot contaminate the cover plate body 1.

[0025] During use, the cover plate body 1 is baked until the temperature drops to 35-55℃. The surface of the cover plate body 1 is then cleaned with an air knife, followed by plasma cleaning. A protective film 2 is then attached to the plasma-cleaned cover plate body 1, ensuring a tight, gapless fit. The protective film 2 does not obstruct the injection hole 11. After the film is attached, the cover plate body 1 undergoes the injection and formation process for the battery cell. During injection and formation, the nozzle and the cover plate body... The residual liquid on the contact surface of body 1 drips onto the protective film 2, preventing contamination of the cover body 1. After replenishing the cylindrical steel shell battery cell with liquid, a sealing rubber plug (not shown in the figure) is inserted. The sealing rubber plug does not contact the protective film 2, preventing foreign matter such as electrolyte crystals on the surface of the protective film from entering the battery cell when the protective film 2 is removed. The battery cell with the sealing rubber plug inserted is placed in a film removal machine (not shown in the figure), and the protective film 2 on the cover is removed in a negative pressure environment to prevent electrolyte crystals on the protective film 2 from splashing and contaminating the cover body 1 during the removal process.

[0026] 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 cell cover plate capable of preventing contamination, characterized in that, Includes cover plate body (1) and protective film (2); A protective film (2) is provided on the upper surface of the cover plate body (1), and the size and shape of the protective film (2) are adapted to the cover plate body (1).

2. The cell cover plate according to claim 1, characterized in that: The material of the protective film (2) has resistance to electrolyte corrosion and high temperature resistance.

3. A cell cover plate capable of preventing contamination according to claim 2, characterized in that: The material of the protective film (2) does not deform within the range of 0-80℃.

4. A cell cover plate capable of preventing contamination according to claim 1, characterized in that: The viscosity of the protective film (2) is greater than 30 MPa.

5. A cell cover plate capable of preventing contamination according to claim 1, characterized in that: The thickness of the protective film (2) is between 0.05 mm and 10 mm, and the thickness of the protective film (2) is less than the thickness of the cover plate body (1).

6. A cell cover plate capable of preventing contamination according to claim 1, characterized in that: The diameter of the protective film (2) is smaller than the diameter of the cover plate body (1), and the protective film (2) after being attached does not exceed the boundary of the cover plate body (1).

7. A cell cover plate capable of preventing contamination according to claim 1, characterized in that: The cover plate body (1) has an injection hole (11) at the center, and a protective film (2) is fixed on the upper surface of the cover plate body (1). The protective film (2) has an avoidance hole (21) near the injection hole (11).

8. A cell cover plate capable of preventing contamination according to claim 7, characterized in that: The cover plate body (1) is disc-shaped. The upper surface of the cover plate body (1) is provided with multiple rings of protrusions spaced around the injection hole (11) as the center. The upper surface of the protective film (2) is provided with multiple rings of protrusions spaced around the avoidance hole (21) as the center. The number and size of the protrusions of the protective film (2) are adapted to the number and size of the protrusions of the cover plate body (1).

9. A cell cover plate capable of preventing contamination according to claim 8, characterized in that: The upper surface of the cover plate body (1) is provided with three rings of protrusions spaced apart around the injection hole (11), and the upper surface of the protective film (2) is provided with three rings of protrusions spaced apart around the avoidance hole (21).

10. A cell cover plate capable of preventing contamination according to claim 1, characterized in that: The cover plate body (1) is made of nickel-plated steel.

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