Anti-curling device for pole piece

Abstract

The utility model belongs to the technical field of lithium ion battery manufacturing, and particularly relates to an anti-curling device for a pole piece, which comprises a supporting unit and a smoothing unit arranged at the head of the supporting unit, and a hollow part for mechanically limiting a blank area of a foil is arranged on the smoothing unit. The anti-curl device is installed in the drying oven, the anti-curl effect can be effectively achieved in time in the drying oven, meanwhile, the distance of the anti-curl device can be adjusted through the telescopic supporting unit so as to adapt to foils with different widths, and the anti-curl device has good universality. The anti-curling device is simple in structure and capable of improving the quality of the pole piece and improving the production efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium ion battery manufacturing, and specifically relates to a pole piece anti-curling device. Background Art

[0002] In the production process of lithium-ion batteries, pole piece coating is a particularly critical process. With the rapid development of lithium-ion batteries, higher requirements are placed on pole pieces. For pole pieces with foil blanking design, the pole piece surface can generally be made smooth by adjusting parameters such as oven temperature and circulating air volume. However, when producing high-area density pole pieces, there are higher requirements for drying, which requires increasing the temperature and circulating air volume. When the slurry dries quickly, the edge of the pole piece is easily affected by its surface tension and curling occurs, resulting in cracks on the edge of the pole piece, and even worse, material falling or belt breaking, affecting the quality and production efficiency of the pole piece.

[0003] At present, the solution to the curling of pole pieces in the industry is generally to adjust the parameters of the oven temperature, circulating air volume, exhaust volume and the ratio of the upper and lower air valves, or to add a baffle at the upper edge of the air box to slow down the drying rate of the pole piece edge, thereby reducing the impact of surface tension on the pole piece edge. However, the above methods often have poor stability, require frequent adjustments by personnel, and cannot prevent mistakes. Therefore, a device that can stably prevent the curling of pole pieces plays a vital role in the stable production of pole piece coating. Utility Model Content

[0004] The utility model aims to provide a pole piece anti-curling device to solve the technical problems in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for preventing the electrode from curling, comprising a support unit and a smoothing unit arranged at the head of the support unit, wherein the smoothing unit is provided with a hollow part for mechanically limiting the blank area of ​​the foil. By adjusting the length of the telescopic support rod, it is ensured that the smoothing unit covers about two-thirds of the edge of the pole ear, and the upper and lower blocking parts of the smoothing unit are used to offset the force of the pole piece deformation to prevent the pole ear from curling, thereby ensuring product quality, improving production efficiency, and reducing the difficulty of production operations. At the same time, by adjusting the length of the telescopic rod to adapt to foils of different widths, it has good versatility.

[0006] Preferably, the support unit is a retractable support rod.

[0007] Preferably, the support unit has a diameter of 5-7 cm and a length of 10-20 cm.

[0008] Preferably, the smoothing unit has a thickness of 5-10 cm and a total height of 3-10 cm, wherein the height of the hollow part is 1-5 cm.

[0009] Preferably, there are a plurality of smoothing units, which are arranged in parallel on both sides of the foil, and the edges of the foil pass through the hollow parts of the smoothing units.

[0010] Preferably, the smoothing unit covers at least two thirds of the width of the blank area on the side of the foil.

[0011] Preferably, the hollow portion is a U-shaped groove structure.

[0012] Preferably, the periphery of the hollow portion is a chamfered structure.

[0013] Preferably, the supporting unit is made of metal.

[0014] Preferably, the smoothing unit is made of polytetrafluoroethylene.

[0015] The beneficial effects of the utility model are as follows: compared with the prior art, the anti-curling device of the utility model is installed inside the oven, and can timely and effectively play an anti-curling role inside the oven. At the same time, the anti-curling device can adjust the distance through the retractable support unit to adapt to foils of different widths, and has good versatility. The anti-curling device has a simple structure, can improve the quality of the pole piece, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the utility model;

[0017] Figure 2 It is a position diagram of the utility model and the foil;

[0018] Figure 3 It is a schematic diagram of the structure in the air box of the oven in the utility model;

[0019] In the figure: 1. support unit; 2. smoothing unit; 3. foil; 4. hollow part; 5. oven air box. DETAILED DESCRIPTION

[0020] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0021] like Figure 1 As shown, a device for preventing electrode tabs from curling is provided on both sides of an oven and is arranged at intervals among a plurality of oven rollers for smoothing the tabs to prevent curling. The device comprises a retractable support unit 1 and a smoothing unit 2 provided at the head of the support unit. The device for preventing electrode tabs is arranged parallel to the foil material, and the foil material 3 passes through a hollow part 4 in the middle of the smoothing unit, and the blank area of ​​the electrode tab is pressed by upper and lower mechanical limiters.

[0022] The support unit is configured as a retractable structure, and foils of different widths can be adapted by adjusting the length of the support rod.

[0023] In some optional embodiments, the smoothing unit covers at least two-thirds of the width of the blank area on the side of the electrode piece. When the electrode piece is quickly dried in the oven, the upper and lower blocking parts of the smoothing unit are used to offset the force of the electrode piece deformation.

[0024] In some optional embodiments, the diameter of the support unit is 5-7 cm, and the length of the support unit can be adjusted by a telescopic rod to adapt to pole pieces of different widths, with a length range of 10-20 cm. The thickness of the smoothing unit is 8 cm, and the total height is 6 cm, of which the height of the hollow part is 2 cm.

[0025] In some optional embodiments, the material of the smoothing unit is polytetrafluoroethylene to prevent long-term high temperature deformation and corrosion.

[0026] A plurality of the devices are installed in parallel inside the oven air box 5, and the foil passes through the hollow part in the middle of the smoothing unit. The purpose of preventing the edge curling of the pole lug is achieved by mechanically limiting the blank area of ​​the pole piece through the hollow part.

[0027] It should be pointed out that the device can be used to transport semi-finished lithium batteries, provide vacuum or inert gas according to requirements, and select different accessories for combination to make full use of space and improve work efficiency. For ordinary technicians in this technical field, without departing from the principle of the utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the scope of protection of the utility model.

Claims

1. A pole piece anti-curling device, characterized in that: The invention comprises a supporting unit and a smoothing unit arranged at the head of the supporting unit. The smoothing unit is provided with a hollow part for mechanically limiting the blank area of ​​the foil material.

2. The pole piece anti-curling device according to claim 1, characterized in that: The support unit is a retractable support rod.

3. The pole piece anti-curling device according to claim 1, characterized in that: The support unit has a diameter of 5-7 cm and a length of 10-20 cm.

4. The pole piece anti-curling device according to claim 1, characterized in that: The smoothing unit has a thickness of 5-10 cm and a total height of 3-10 cm, wherein the height of the hollow part is 1-5 cm.

5. The pole piece anti-curling device according to claim 1, characterized in that: There are multiple smoothing units, which are arranged in parallel on both sides of the foil material, and the edges of the foil material pass through the hollow parts of the smoothing units.

6. The pole piece anti-curling device according to claim 5, characterized in that: The smoothing unit covers at least two thirds of the width of the side blank area of ​​the foil section.

7. The pole piece anti-curling device according to claim 1, characterized in that: The hollow part is a U-shaped groove structure.

8. The pole piece anti-curling device according to claim 1, characterized in that: The periphery of the hollow part is a chamfered structure.

9. The pole piece anti-curling device according to claim 1, characterized in that: The supporting unit is made of metal.

10. The pole piece anti-curling device according to claim 1, characterized in that: The material of the smoothing unit is polytetrafluoroethylene.

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