CN211480184U - A lithium ion battery pole piece indentation device - Google Patents

Abstract

The utility model discloses a lithium ion battery pole piece indentation device rigid coupling is in the frame of battery pole piece production line, including installing last roller assembly and lower roller assembly that just is setting from top to bottom in the frame, it all includes servo motor, bearing frame and roller to go up roller assembly and lower roller assembly, the length direction who follows the peripheral circle direction of roller and follow the roller on going up the roller of roller assembly is equipped with the bump, be equipped with along the peripheral circle direction of roller and the length direction who follows the roller on the roller of lower roller assembly with the concave point of bump one-to-one. The utility model discloses a bump on going up the roller assembly cooperatees with the concave point on the roller assembly, extrudes the concave point structure of certain degree of depth on battery pole piece, and the inside pole piece of book core and pole piece can produce certain clearance after the hot pressing process, can provide sufficient thickness release space for the thickness rebound of each process of follow-up pole piece to this effectively avoids rolling up the core pole piece and causes the pole piece fold because of the thickness rebound.

Description

A lithium ion battery pole piece indentation device

technical field

The utility model belongs to the technical field of battery processing, in particular to a lithium ion battery pole piece indentation device.

Background technique

Lithium batteries have the advantages of small size, large capacity, long service life, low self-discharge rate, no memory effect, and green environmental protection. They are currently widely used in commercial vehicles, special vehicles, electric bicycles, energy storage systems, medical equipment, etc. With the continuous application and promotion of new energy vehicles, battery manufacturers have higher and higher requirements for the energy density of power batteries.

In order to improve the energy density of power batteries, the current methods widely adopted by battery manufacturers are to increase the compaction density of the positive and negative electrodes, increase the size of the battery, etc. to obtain the compression of the battery cell in the internal space. Changes in the physical force of the core material itself or due to the accumulation of side reaction products inside the cell will cause the thickness of the cell electrode sheet to increase continuously, causing the cell electrode sheet to form wrinkles. Serious wrinkles will affect the thickness and cycle life of the battery.

The increase in the thickness of the pole piece mainly includes the rebound of the pole piece baking thickness, the increase in the thickness of the pole piece liquid absorption, and the increase in the thickness of the lithium intercalation. Releasing in advance can reduce the wrinkle of the subsequent cell pole pieces to a certain extent, but this method cannot completely solve the wrinkle problem of the cell pole pieces, and the energy consumption is high, making it difficult to manufacture.

Utility model content

The purpose of this utility model is to provide a lithium ion battery pole piece indentation device to overcome the above technical problems.

The above-mentioned technical purpose of the present utility model is achieved through the following technical solutions:

A lithium ion battery pole piece indentation device is fixed on a frame of a battery pole piece production line, comprising an upper roller assembly and a lower roller assembly installed on the frame and arranged up and down, the upper roller assembly and the lower roller assembly. Each roller assembly includes a servo motor, a bearing seat and a roller. The roller of the upper roller assembly is provided with bumps along the outer circumference of the roller and along the length of the roller. The roller of the lower roller assembly is provided with bumps. There are concave points corresponding to the convex points one-to-one along the outer circumferential direction of the roller and along the length direction of the roller, and the relative movement of the roller of the upper roller assembly and the roller of the lower roller assembly drives the battery The pole piece moves.

Further, both the convex point and the concave point are hemispherical.

Further, a heating resistance wire is arranged in the roller of the upper roller assembly.

Further, the roller of the lower roller assembly is made of rubber.

Further, the lower roller assembly is connected to the frame through a lifting assembly, and the lifting assembly is provided with two groups, which are respectively fixed to the two bearing seats of the lower roller assembly, and the lifting assembly includes: Lifting cylinder, the movable end of the lifting cylinder is connected with the bearing seat, a regulating plate is fixedly connected to the lower part of the lifting cylinder, the regulating plate is an inverted L-shaped structure, and the vertical plate of the inverted L-shaped structure is A waist-shaped hole is provided, and the adjusting plate is installed on the frame through the waist-shaped hole.

Beneficial effects:

The utility model uses the convex points on the upper roller assembly to cooperate with the concave points on the lower roller assembly, and drives the battery pole piece to move while extruding a certain depth of concave point structure on the battery pole piece. There will be a certain gap between the pole piece and the pole piece, which can provide enough thickness release space for the thickness rebound of the subsequent pole piece in each process, so as to effectively avoid the pole piece wrinkle caused by the thickness rebound of the winding core pole piece;

There is a heating resistance wire inside the roller of the upper roller assembly, which can be used to heat the roller. By heating the roller indirectly to heat the pole piece, the elongation rate of the current collector of the pole piece and the mobility of the surface material of the current collector can be increased. , to avoid damage to the pole piece during the indentation process and reduce the processing of the indentation;

The lower roller assembly is connected to the lifting assembly, the lifting cylinder controls the lifting and lowering of the roller of the lower roller assembly, and the position of the lifting cylinder is adjusted by the adjusting plate, thereby controlling the depth of the pits of the processed pole piece.

Description of drawings

Fig. 1 is the structural representation of the utility model;

2 is a schematic diagram of the coordination of a concave point and a convex point in the utility model;

In the figure: 1. Upper roller assembly; 11. Servo motor; 12. Bearing seat; 13. Roller; 14. Concave point; 2. Lower roller assembly; 21. Concave point; 3. Lifting assembly; 32. Adjustment plate.

Detailed ways

In the description of the present invention, unless otherwise specified, the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are only for describing the present invention and simplifying the description. Rather than indicating or implying that the indicated device or structure must have a specific orientation, it cannot be construed as a limitation to the present invention. Furthermore, the terms "first," "second," etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

As shown in Figure 1, a lithium-ion battery pole piece indentation device according to the present utility model is fixed on the frame of the battery pole piece production line, and is mostly installed in front of the winding mechanism of the roller press, used for the battery pole piece indentation device. The indentation is processed on the pole piece to provide sufficient thickness release space for the thickness rebound of each subsequent pole piece process.

The lithium-ion battery pole piece indentation device includes an upper roller assembly and a lower roller assembly installed on the frame and arranged up and down, and the upper and lower roller assemblies both include a servo motor, a bearing seat and a roller. , the servo motor is connected with the shaft on the roller, the shaft on the roller is mounted on the frame through the bearing seat, and the roller of the upper roller assembly can be provided with a heating resistance wire , the roller of the lower roller assembly is made of rubber.

On the roller of the upper roller assembly, there are convex points along the outer circumference of the roller and along the length direction of the roller. The convex points are evenly distributed on the roller, and the convex points are all hemispherical. ; The roller of the lower roller assembly is provided with concave points corresponding to the convex points one by one along the outer circumferential direction of the roller and along the length direction of the roller, and the concave points are evenly distributed on the roller On the top, the concave point adopts a hemispherical shape corresponding to the convex point, and the junction of the concave point and the roller surface adopts an arc for transition.

As shown in Fig. 2, when the roller of the upper roller assembly and the roller of the lower roller assembly move relative to each other, the convex point will be abutted with the concave point, so that the upper and lower rollers drive the battery When the pole piece moves, the concave point and the convex point cooperate with each other to form a meshing connection, and the concave point structure will be pressed on the battery pole piece.

As shown in Figure 1, the lower roller assembly is connected to the frame through a lifting assembly, and the lifting assembly is provided with two groups, which are respectively fixed to the two bearing seats of the lower roller assembly. The lifting assembly includes a lifting cylinder, the movable end of the lifting cylinder is connected with the bearing seat, an adjustment plate is fixedly connected to the lower part of the lifting cylinder, and the adjustment plate adopts an inverted L-shaped structure, and the vertical direction of the inverted L-shaped structure is A waist-shaped hole is arranged on the face plate, the adjusting plate is installed on the frame through the waist-shaped hole, and the setting of the waist-shaped hole can facilitate the adjustment of the position of the adjusting plate.

when using it:

Open the heating resistance wire in the upper roller of the upper roller assembly, start the servo motors of the upper roller assembly and the lower roller assembly to reset, adjust the position of the roller of the lower roller assembly through the lifting cylinder, and adjust the position of the lifting cylinder through the adjusting plate. The depth of the indentation required for the battery pole piece, start the servo motors of the upper roller assembly and the lower roller assembly again, the two rollers will drive the two rollers in the battery pole piece to lead out, and the mutual cooperation of the concave and convex points will affect the battery poles. The sheet is subjected to indentation processing, and the winding mechanism of the roller press winds the indented battery pole pieces.

In order to make the purpose, technical solutions and advantages of the present utility model more concise and clear, the present utility model is described with the above specific embodiments, which are only used to describe the present utility model and should not be construed as limiting the scope of the present utility model. It should be pointed out that any modifications, equivalent replacements and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model. Therefore, the protection scope of the patent for this utility model shall be subject to the appended claims.

Claims (5)

1. A lithium-ion battery pole piece indentation device, which is fixed on the frame of the battery pole piece production line, characterized in that it comprises an upper roller assembly (1) and a lower roller assembly installed on the frame and arranged up and down. A roller assembly (2), the upper roller assembly and the lower roller assembly each include a servo motor (11), a bearing seat (12) and a roller (13), the upper roller of the upper roller assembly is along the outer circumference of the roller There are convex points (14) in the direction and along the length direction of the roller, and the roller of the lower roller assembly is provided with a one-to-one correspondence with the convex points along the outer circumference direction of the roller and along the length direction of the roller. The concave point (21), the relative movement of the roller of the upper roller assembly and the roller of the lower roller assembly drives the battery pole piece to move. 2 . The device for indenting a pole piece of a lithium ion battery according to claim 1 , wherein the convex point and the concave point are both hemispherical. 3 . 3. The lithium-ion battery pole piece indentation device according to claim 1, wherein a heating resistance wire is provided in the roller of the upper roller assembly. 4. The lithium-ion battery pole piece indentation device according to claim 1, wherein the roller of the lower roller assembly is made of rubber. 5. The lithium-ion battery pole piece indentation device according to claim 1, wherein the lower roller assembly is connected to the frame through a lifting assembly (3), and the lifting assembly is provided with two groups: and are respectively fixed with the two bearing seats of the lower roller assembly, the lifting assembly includes a lifting cylinder (31), the movable end of the lifting cylinder is connected with the bearing seat, and the lower part of the lifting cylinder is fixedly connected There is an adjustment plate (32), the adjustment plate is an inverted L-shaped structure, and a waist-shaped hole is provided on the vertical plate of the inverted L-shaped structure, and the adjustment plate is installed on the frame through the waist-shaped hole.

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