Battery cell bottom separator folding prevention device

Abstract

This application relates to a device for preventing the bottom diaphragm of a battery cell from folding over, belonging to the field of battery cell manufacturing technology. To solve the problem of diaphragm folding during battery cell wrapping, the device includes anti-folding mechanisms arranged on both sides of a gripper frame. Two anti-folding mechanisms are symmetrically arranged on both sides of the gripper frame. Each anti-folding mechanism includes a telescopic cylinder and an L-shaped push block. The telescopic cylinder is inclinedly arranged on the gripper frame, and the L-shaped push block is hinged to the output end of the telescopic cylinder, pressing against the bottom of the battery cell. This application effectively solves the problem of diaphragm folding due to tensile force during Mylar membrane wrapping, eliminates quality risks such as electrode exposure caused by diaphragm folding, and significantly improves the battery cell yield.

Description

Technical Field

[0001] This application relates to the field of battery cell manufacturing technology, and in particular to a device for preventing the bottom diaphragm of a battery cell from folding over. Background Technology

[0002] In today's battery cell manufacturing industry, Mylar coating automation equipment has become one of the key production equipment. With the ever-increasing demands on battery performance from electronic devices, the production efficiency and quality stability of battery cells face significant challenges. Mylar coating automation equipment, with its high efficiency and precision, plays a crucial role in battery cell production. Among these, the vertical coating method, a common coating process, is widely used in battery cell production. This method involves keeping the battery cell vertical and using a coating platform to move the Mylar film from a lying position towards the large surface of the cell, thus achieving the coating operation. This coating method has certain advantages in improving production efficiency, enabling the rapid completion of the battery cell coating process and meeting the needs of large-scale production. Therefore, it has been widely adopted by many battery cell manufacturers.

[0003] However, in actual production, the Mylar membrane needs to be pulled together from its flat position towards the main surface of the cell. This process puts a tensile force on the separator at the bottom of the cell. The separator at the bottom of the cell is relatively fragile and is prone to folding under strong tensile force. Once the separator folds, the electrode will be exposed, increasing the quality risk of the cell and affecting the pass rate. Therefore, this issue needs to be addressed. Utility Model Content

[0004] To address the issue of diaphragm folding during battery cell encapsulation, this application provides a device to prevent the bottom diaphragm of the battery cell from folding.

[0005] The technical solution for the device that prevents the bottom diaphragm of the battery cell from folding is provided in this application:

[0006] A device for preventing the bottom diaphragm of a battery cell from flipping over includes anti-flipping mechanisms arranged on both sides of a gripper frame. The two anti-flipping mechanisms are symmetrically arranged on both sides of the gripper frame. Each anti-flipping mechanism includes a telescopic cylinder and an L-shaped push block. The telescopic cylinder is inclinedly arranged on the gripper frame, and the L-shaped push block is hinged to the output end of the telescopic cylinder. The L-shaped push block presses against the bottom of the battery cell.

[0007] Because the Mylar membrane needs to be pulled together from its flat position towards the main surface of the battery cell, this process will exert a pulling force on the separator at the bottom of the battery cell. The separator at the bottom of the battery cell is relatively fragile and is prone to folding under strong pulling force. Once the separator folds, the electrode will be exposed, increasing the quality risk of the battery cell and affecting the pass rate. By adopting the above technical solution, including two anti-folding mechanisms, the anti-folding mechanism includes a telescopic cylinder and an L-shaped pusher.

[0008] When the battery cell is being coated, the anti-flipping device is in the retracted state, the loading gripper moves to the waiting position, the battery cell is loaded onto the loading gripper, the gripper closes to keep the battery cell vertical, the loading gripper carries the battery cell to above the coating platform, the coating platform is in a flat state, the Mylar film is unfolded in a straight line, the loading gripper places the battery cell on the coating platform, the anti-flipping device's telescopic cylinder extends, the L-shaped push block abuts against the bottom of the battery cell to prevent flipping, the coating platform begins to retract from the flat state, driving the Mylar film to retract towards the large surface of the battery cell. During the first retraction process, the loading gripper maintains clamping, and the anti-flipping device remains against the bottom of the battery cell. During the second retraction, the coating platform continues to retract until it completely wraps the battery cell. At this time, the anti-flipping device cylinder retracts, the coating platform is completely retracted, and the coating process is completed.

[0009] By setting up an anti-folding mechanism, the problem of folding caused by tensile force during the Mylar membrane retraction process is effectively solved. This eliminates quality risks such as electrode exposure caused by folding of the diaphragm, significantly improves the cell qualification rate, directly drives the optimization of production efficiency and cost reduction, reduces scrap rate and rework losses, and strengthens production continuity.

[0010] Optionally, each of the telescopic cylinders is provided with a triangular sheet metal for installation on one side, the flat end of the triangular sheet metal is connected to the gripper frame, and the cylinder body of the telescopic cylinder is arranged on the inclined end of the triangular sheet metal.

[0011] By adopting the above technical solution, the telescopic cylinder is installed at an angle on the outer wall of the gripper frame via a triangular sheet metal. Through the setting of the triangular sheet metal, the geometric characteristics of its inclined end and flat end are utilized to provide a support foundation for the telescopic cylinder to be installed at an angle, and the rigid connection between the flat end and the gripper frame significantly improves the mechanical stability of the overall structure.

[0012] Optionally, the flat end of the triangular sheet metal is provided with an arc-shaped block, the gripper frame is provided with an arc-shaped sliding groove for mounting the arc-shaped block, and the arc-shaped block is provided with a locking bolt for fixing.

[0013] By adopting the above technical solution, a triangular sheet metal arc block is welded, and the arc block is slidably installed in an arc groove and fixed by locking bolts. Through the setting of arc block, arc groove and locking bolts, the structure designs the triangular sheet metal as an independent module, realizing quick disassembly and assembly without tools, and significantly improving maintenance efficiency.

[0014] Optionally, the triangular sheet metal is provided with a combined shim for adjusting the tilt angle of the telescopic cylinder, and the combined shim is arranged at the connection between the triangular sheet metal and the telescopic cylinder.

[0015] By adopting the above technical solution, the combined gasket is installed on the triangular sheet metal; the combined gasket is composed of multiple sub-gaskets of different thicknesses. By increasing or decreasing the number of sub-gaskets, the cylinder tilt angle can be quickly adjusted to meet the requirements of high-precision processes.

[0016] Optionally, the combined gasket is provided with a positioning pin for fixing the triangular sheet metal, the positioning pin passing through the combined gasket and connected to the triangular sheet metal.

[0017] By adopting the above technical solution, the combined gasket is installed on the triangular sheet metal by a positioning pin; by setting the positioning pin, the positioning pin passes through the gasket and is directly inserted into the positioning hole of the triangular sheet metal to form a rigid connection, eliminating manual calibration errors (such as tilting, eccentricity) and ensuring that the cylinder axis is completely consistent with the force direction of the anti-tipping mechanism.

[0018] Optionally, a silicone pad is provided on the L-shaped push block, and the silicone pad is arranged at the pressing end of the L-shaped push block.

[0019] By adopting the above technical solution, the silicone pad is installed on the L-shaped push block; through the setting of the silicone pad, the silicone pad has high elasticity and can absorb the impact force during the operation of the L-shaped push block, avoiding scratches or indentations on the object being pushed.

[0020] Optionally, the silicone pad is provided with a T-shaped protrusion, and the L-shaped push block is provided with a T-shaped slot for engaging with the T-shaped protrusion.

[0021] By adopting the above technical solution, the T-shaped protrusion is installed on one side of the silicone pad, and the silicone pad cooperates with the T-shaped slot of the L-shaped push block through the T-shaped protrusion; through the setting of the T-shaped protrusion and the T-shaped slot, the silicone pad and the L-shaped push block can be quickly disassembled and accurately positioned without the need for bolts or glue, and the maintenance time is short.

[0022] Optionally, the surface of the silicone pad is provided with a plurality of wear-resistant particles, which are distributed in a dot matrix on the surface of the silicone pad.

[0023] By adopting the above technical solution, several wear-resistant particles are integrally molded on the surface of the silicone pad; the setting of wear-resistant particles helps to improve the wear resistance of the silicone pad, extend its service life, and reduce the frequency of replacement and downtime.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. By setting up an anti-folding mechanism, the problem of folding caused by tensile force during the Mylar membrane retraction process is effectively solved, eliminating quality risks such as electrode exposure caused by folding of the diaphragm, significantly improving the cell qualification rate, directly leading to optimized production efficiency and reduced costs, reduced scrap rate and rework losses, and consolidating production continuity.

[0026] 2. By setting up the triangular sheet metal, the triangular sheet metal utilizes the geometric characteristics of its inclined end and flat end to provide a support base for the inclined installation of the telescopic cylinder, and through the rigid connection between the flat end and the gripper frame, it significantly improves the mechanical stability of the overall structure.

[0027] 3. By using a modular shim, which is composed of multiple sub-shims of different thicknesses, the cylinder tilt angle can be quickly adjusted by increasing or decreasing the number of sub-shims to meet high-precision process requirements. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a device for preventing the bottom diaphragm of the battery cell from folding in an embodiment of this application.

[0029] Figure 2 This is a schematic diagram illustrating the structure of the triangular sheet metal in the embodiments of this application.

[0030] Figure 3 This is a schematic diagram illustrating the structure of the L-shaped pusher and the silicone pad in the embodiments of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Gripper frame; 2. Anti-tipping mechanism; 21. Telescopic cylinder; 22. L-shaped push block; 3. Triangular sheet metal; 4. Arc-shaped block; 5. Arc-shaped slide groove; 6. Locking bolt; 7. Combined gasket; 8. Positioning pin; 9. Silicone pad; 10. T-shaped protrusion; 11. T-shaped slot; 12. Wear-resistant particles. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0033] This application discloses a device for preventing the bottom diaphragm of a battery cell from folding over. (Refer to...) Figure 1 The device for preventing the bottom membrane of the battery cell from flipping includes two anti-flipping mechanisms 2. In this embodiment, the two anti-flipping mechanisms 2 are symmetrically installed on both sides of the existing gripper frame 1. The existing gripper frame 1 is equipped with grippers inside, which clamp the battery cell to keep it in a vertical position. The coating platform coats the battery cell. The existing coating method adopts segmented coating.

[0034] Reference Figure 1 and Figure 2Each anti-tipping mechanism 2 includes a telescopic cylinder 21 and an L-shaped push block 22. A triangular sheet metal 3 is installed on one side of the telescopic cylinder 21. In this embodiment, the flat end of the triangular sheet metal 3 is arranged on the gripper frame 1, and the telescopic cylinder 21 is installed on the inclined end of the triangular sheet metal 3. At the same time, an arc-shaped block 4 is welded to the flat end of the triangular sheet metal 3. An arc-shaped slide groove 5 is provided on the gripper frame 1. The arc-shaped slide groove 5 is opened along the height direction of the gripper frame 1, so that the triangular sheet metal 3 is slidably installed in the arc-shaped slide groove 5 of the gripper frame 1 through the arc-shaped block 4. A locking bolt 6 is installed on the arc-shaped block 4. The locking bolt 6 passes through the arc-shaped block 4 and is threaded into the through hole of the arc-shaped slide groove 5. The number of through holes in the arc-shaped slide groove 5 can be designed according to the actual situation. This structure designs the triangular sheet metal 3 as an independent module, realizing quick disassembly and assembly without tools, and significantly improving maintenance efficiency.

[0035] Reference Figure 1 and Figure 2 A combined gasket 7 is installed between the telescopic cylinder 21 and the triangular sheet metal 3. The combined gasket 7 is composed of multiple sub-gaskets of different thicknesses. By increasing or decreasing the number of sub-gaskets, the tilt angle of the cylinder can be quickly adjusted to meet the requirements of high-precision processes.

[0036] Reference Figure 1 and Figure 2 Meanwhile, a positioning pin 8 is installed on the combined gasket. The positioning pin 8 passes through the combined gasket 7 and is connected to the positioning hole of the triangular sheet metal 3 to form a rigid connection, eliminating manual calibration errors (such as tilting or eccentricity) and ensuring that the cylinder axis is completely consistent with the force direction of the anti-tipping mechanism 2.

[0037] Reference Figure 1 The output end of the telescopic cylinder 21 is arranged facing the bottom of the battery cell held by the gripper. At the same time, the L-shaped push block 22 is hinged to the output end of the telescopic cylinder 21. In this embodiment, the hinge between the telescopic cylinder 21 and the L-shaped push block 22 is equipped with a torsion spring structure. When the telescopic cylinder 21 pushes the L-shaped push block 22 to move towards the bottom of the battery cell, the long side of the L-shaped push block 22 will contact the side wall of the battery cell first. At this time, the outer wall of the battery cell applies a reverse force to the L-shaped push block 22, forcing the L-shaped push block 22 to rotate around the hinge axis. The torsion spring and other structures set inside the L-shaped push block 22 store energy in this process. When the horizontal arm of the L-shaped push block 22 crosses the edge of the battery cell and reaches the bottom, the torsion spring releases energy to drive the push block to rebound counterclockwise quickly and accurately press against the bottom of the battery cell.

[0038] Reference Figure 1 and Figure 3 The L-shaped pusher 22 has a silicone pad 9 installed at its pressing end. The silicone pad 9 presses against the bottom of the battery cell. Several wear-resistant particles 12 are integrally formed on the surface of the silicone pad 9. The wear-resistant particles 12 are distributed in a dot matrix on the surface of the silicone pad 9. This helps to improve the wear resistance of the silicone pad 9, extend its service life, and reduce the frequency of replacement and downtime.

[0039] Reference Figure 3 The silicone pad 9 is equipped with a T-shaped protrusion 10, which can be made of hard silicone material. The L-shaped push block 22 has a T-shaped slot 11. The T-shaped protrusion 10 is inserted and fixed in the T-shaped slot 11, thereby fixing the silicone pad 9 and the L-shaped push block 22. This enables quick assembly and disassembly and precise positioning of the silicone pad 9 and the L-shaped push block 22 without the need for bolts or glue, resulting in short maintenance time.

[0040] The implementation principle of the anti-flipping device for the bottom membrane of the battery cell in this embodiment is as follows: When the battery cell is coated, the anti-flipping device is in a retracted state, the feeding gripper moves to the waiting position, the battery cell is loaded onto the feeding gripper, the gripper closes to keep the battery cell vertical, the feeding gripper carries the battery cell to the top of the coating platform, the coating platform is in a flat state, the Mylar film is unfolded in a straight line, the feeding gripper places the battery cell on the coating platform, the anti-flipping device telescopic cylinder 21 extends, the L-shaped push block 22 abuts against the bottom of the battery cell to prevent flipping, the coating platform begins to retract from the flat state, driving the Mylar film to retract towards the large surface of the battery cell. During the first retraction process, the feeding gripper maintains clamping, and the anti-flipping device maintains abutting against the bottom of the battery cell. During the second retraction, the coating platform continues to retract until it completely wraps the battery cell. At this time, the anti-flipping device cylinder retracts, the coating platform is completely retracted, and the coating process is completed.

[0041] By setting up the anti-folding mechanism 2, the problem of folding caused by the tension of the diaphragm during the Mylar membrane retraction process is effectively solved. This eliminates the quality risks such as electrode exposure caused by folding of the diaphragm, significantly improves the cell qualification rate, directly drives the optimization of production efficiency and the reduction of costs, reduces the scrap rate and rework losses, and strengthens the continuity of production.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for preventing the bottom diaphragm of a battery cell from flipping over, comprising anti-flipping mechanisms arranged on both sides of a gripper frame, characterized in that: The two anti-flipping mechanisms are symmetrically arranged on both sides of the gripper frame. Each anti-flipping mechanism includes a telescopic cylinder and an L-shaped push block. The telescopic cylinder is inclinedly arranged on the gripper frame, and the L-shaped push block is hinged to the output end of the telescopic cylinder. The L-shaped push block presses against the bottom of the battery cell.

2. The device for preventing the bottom diaphragm of the battery cell from folding as described in claim 1, characterized in that: Each of the telescopic cylinders is provided with a triangular sheet metal for installation on one side. The flat end of the triangular sheet metal is connected to the gripper frame, and the cylinder body of the telescopic cylinder is arranged on the inclined end of the triangular sheet metal.

3. The device for preventing the bottom diaphragm of the battery cell from folding according to claim 2, characterized in that: The triangular sheet metal has an arc-shaped block on its flat end, and the gripper frame has an arc-shaped groove for mounting the arc-shaped block. The arc-shaped block is also equipped with a locking bolt for fixing.

4. The device for preventing the bottom diaphragm of the battery cell from folding according to claim 2, characterized in that: The triangular sheet metal is provided with a combined shim for adjusting the tilt angle of the telescopic cylinder, and the combined shim is arranged at the connection between the triangular sheet metal and the telescopic cylinder.

5. The device for preventing the bottom diaphragm of the battery cell from folding according to claim 4, characterized in that: The combined gasket is provided with a positioning pin for fixing the triangular sheet metal. The positioning pin passes through the combined gasket and is connected to the triangular sheet metal.

6. The device for preventing the bottom diaphragm of the battery cell from folding according to claim 1, characterized in that: A silicone pad is provided on the L-shaped push block, and the silicone pad is arranged at the pressing end of the L-shaped push block.

7. The device for preventing the bottom diaphragm of the battery cell from folding according to claim 6, characterized in that: The silicone pad has a T-shaped protrusion, and the L-shaped push block has a T-shaped slot for engaging with the T-shaped protrusion.

8. The device for preventing the bottom diaphragm of the battery cell from folding according to claim 6, characterized in that: The surface of the silicone pad is provided with a number of wear-resistant particles, which are distributed in a dot matrix on the surface of the silicone pad.

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