Coiled battery core withdrawing device and method

Abstract

The invention discloses a winding battery core withdrawing device in the field of lithium battery processing, and aims to solve the problem of diaphragm damage in the battery core withdrawing process in the prior art, the winding battery core withdrawing device comprises a winding needle and a material taking clamp, and further comprises a transverse clamp and a half-release structure, the transverse clamp is used for applying clamping force to the two side edges of a battery core, and the half-release structure is used for clamping the two side edges of the battery core. The semi-disengagement structure is used for releasing the internal stress of the battery cell and is mounted on the chassis on the horizontal line of the winding needle; the winding needle is coated with an isolation adhesive tape, and the isolation adhesive tape is used for isolating the winding needle from a diaphragm in the battery cell. According to the application, the isolation rubber tape is wound on the winding needle to reduce the friction force when the winding needle is in contact with the diaphragm on the battery cell, in the cell withdrawing process, firstly, the internal stress of the battery cell is released through the semi-release structure, then, the clamping force is applied to the side edge of the battery cell through the transverse clamp to separate the interior of the battery cell from the winding needle, and finally, the battery cell is taken out by using the material taking clamp; the contact between the diaphragm and the winding needle is reduced, and the diaphragm is prevented from being damaged.

Description

Technical Field

[0001] The present application relates to the field of battery processing, and in particular to a device and method for unwinding a wound battery. Background Art

[0002] Lithium-ion soft-pack batteries have excellent performance such as long cycle life, high energy density and small volume, and low internal resistance, which helps to reduce the self-consumption of the battery and make the battery have good cycle life and rate characteristics. In terms of design, the shape of the soft-pack battery can be customized according to customer needs, providing greater flexibility. Therefore, soft-pack lithium batteries have been widely used in many fields with their unique advantages. The soft-pack battery structure includes a positive electrode, a negative electrode, a diaphragm, an electrolyte and an aluminum-plastic film material package (nylon, aluminum layer, PP layer, etc.) structure. In lithium batteries, the main function of the diaphragm is to isolate the positive and negative electrodes, prevent short circuits, and allow lithium ions to pass through. The ceramic diaphragm (composed of materials such as nano-alumina) is widely used in materials because of its high temperature resistance. It can provide additional protection when the battery is overheated. During the winding process, the ceramic surface corresponds to the positive electrode, and the surface of the winding needle directly contacts the ceramic surface. When a battery cell is wound, it needs to be unwound. During this process, the rough surface of the ceramic diaphragm will produce a large friction, making it difficult to unwind the battery cell, which seriously affects the winding efficiency and wastes materials. Summary of the invention

[0003] The purpose of the present application is to provide a device and method for winding battery cores, which releases the stress inside the battery cell on the winding needle and separates it from the winding needle through a semi-detached structure and a horizontal clamp, and then uses a material removal clamp to extract the winding needle to avoid contact between the winding needle and the diaphragm inside the battery cell, thereby avoiding damage to the diaphragm during extraction.

[0004] In order to solve the above technical problems, the following technical solutions are adopted:

[0005] In a first aspect, the present application provides a winding battery core unwinding device, including a winding needle and a material taking clamp, and also including a horizontal clamp and a semi-detached structure, wherein the horizontal clamp is used to apply a clamping force to both sides of the battery core, and the semi-detached structure is used to release the internal stress of the battery core, and the semi-detached structure is installed on a chassis on the horizontal line of the winding needle;

[0006] The semi-detachable structure comprises a first telescopic member and a second telescopic member, the front end of the first telescopic member is provided with a conical needle winding nozzle, the front end of the needle winding is arranged in the needle winding nozzle, a spring is arranged inside the first telescopic member, the first telescopic member and the second telescopic member are mounted on the chassis, the first telescopic member and the second telescopic member are connected to a cylinder, and the first telescopic member and the second telescopic member are telescopic in parallel to the needle winding direction;

[0007] The winding needle is coated with an isolation tape, and the isolation tape is used to isolate the winding needle from the diaphragm in the battery cell.

[0008] Optionally, the horizontal clamp includes a first clamping plate and a second clamping plate, the first clamping plate end side is provided with a first V-shaped groove, the second clamping plate end side is provided with a second V-shaped groove, the surfaces of the first V-shaped groove and the second V-shaped groove are provided with silicone, and the first V-shaped groove and the second V-shaped groove apply clamping force to the rounded corners on both sides of the battery cell through a clamping cylinder.

[0009] Optionally, the cross clamp is detachably mounted on a lifting platform perpendicular to the bottom of the winding needle through screw holes and screws provided at its ends, and the lifting platform is controlled to move up and down by a lifting platform cylinder.

[0010] Optionally, the material picking clamp includes a first fixing member and a second fixing member, a first finger-shaped member is disposed at an end of the first fixing member, and a second finger-shaped member is disposed at an end of the second fixing member.

[0011] Optionally, the material picking clamp is also provided with a telescopic cylinder and a strong and weak clamping cylinder, the telescopic cylinder is used to drive the material picking clamp to move horizontally, and the strong and weak clamping cylinder is used to drive the opening and closing and the clamping force of the first finger-shaped member and the second finger-shaped member.

[0012] Optionally, a first silicone rubber is disposed on a surface of the first finger-shaped member, and a second silicone rubber is disposed on a surface of the second finger-shaped member.

[0013] Optionally, the isolation tape comprises a fluororesin film layer and a silicone adhesive layer, the silicone adhesive layer is in contact with the winding needle, and the fluororesin film layer is in contact with the separator in the battery core.

[0014] Optionally, the material picking clamp is installed on a robotic arm, and the material picking and placing of the material picking clamp is completed by the robotic arm cylinder and the rotary motor.

[0015] In a second aspect, the present application provides a method for winding a battery core, comprising the following steps:

[0016] A. The cylinders on the first telescopic member and the second telescopic member move away from the winding needle, the spring inside the first telescopic member pops out, and the conical winding needle mouth at the end of the first telescopic member moves away from the winding needle, and the winding needle mouth and the battery cell on the winding needle are in a semi-detached state;

[0017] B. The second telescopic member is driven by the cylinder to move away from the winding needle. The second telescopic member pulls the first telescopic member to move. The conical winding needle nozzle at the end of the first telescopic member is completely disengaged from the battery cell, and the internal stress of the battery cell on the winding needle near the winding needle nozzle is released;

[0018] C. Then, clamping force is applied to both sides of the battery cell through the horizontal clamp, and the central pore of the battery cell is enlarged;

[0019] D. The material picking clamp holds the battery cell, and the winding needle slowly moves away from the battery cell. The battery cell is detached from the winding needle and placed on the conveyor belt.

[0020] Optionally, after the material picking device clamps the battery cell, a strong and weak alternating clamping force is applied to the battery cell through a strong and weak cylinder.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present application reduces the friction between the winding needle and the diaphragm on the battery cell when they are in contact by wrapping an isolation tape on the winding needle. During the core withdrawal process, the internal stress of the battery cell is first released through a semi-detached structure, and then a clamping force is applied to the side of the battery cell through a horizontal clamp to increase the central pore of the battery cell. Finally, the material removal clamp clamps the battery cell and removes it, reducing the contact between the diaphragm and the winding needle and avoiding damage to the diaphragm.

[0023] 2. The horizontal clamp applies clamping force to the battery cell, and the upper and lower ends of the battery cell bulge, and the middle is separated from the winding needle, so that the battery cell can be better pulled away from the winding needle by the material removal clamp and does not contact the winding needle to avoid damage to the diaphragm. Silicone is provided on the parts of the horizontal clamp and the material removal clamp that contact the battery cell to avoid damage to the battery cell during clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the unfolded structure of the battery cell in the embodiment of the present application;

[0025] Figure 2 2 is a schematic diagram of the overall structure of the core-retracting device in the embodiment of the present application;

[0026] Figure 3 This is a schematic diagram of the unfolding structure of the material taking clamp in the embodiment of the present application;

[0027] Figure 4 This is a schematic diagram of the horizontal clamp deployment structure in an embodiment of the present application;

[0028] Figure 5 It is a schematic diagram of a semi-detached structure and a winding needle structure in an embodiment of the present application;

[0029] Figure 6 This application Figure 5 The enlarged schematic diagram at A in the middle;

[0030] Figure 7 It is a schematic diagram of the isolation tape structure in the embodiment of the present application.

[0031] Description of reference numerals:

[0032] 01, battery cell; 100, positive electrode sheet; 101, negative electrode sheet; 102, diaphragm; 103, left electrode ear; 104, right electrode ear; 02, material removal clamp; 200, first silicone; 201, second silicone; 202, first fixing piece; 203, second fixing piece; 204, first finger-shaped piece; 205, second finger-shaped piece; 206, strong and weak clamping cylinder; 207, telescopic cylinder; 208, rotating motor; 03, horizontal clamp; 300, first clamping plate; 301, second clamping plate; 302, The first V-shaped groove; 303, the second V-shaped groove; 304, the lifting platform cylinder; 305, the clamping cylinder; 04, the semi-detached structure; 400, the winding needle; 401, the winding needle mouth; 402, the first telescopic part; 403, the second telescopic part; 404, the chassis; 405, the large plate; 406, the winding needle sleeve; 407, the winding needle telescopic groove part; 408, the winding needle buckle part; 409, the winding needle retracting cylinder; 05, the isolation tape; 500, the fluororesin film layer; 501, the silicone adhesive layer. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use.

[0034] Example 1

[0035] like Figure 1-Figure 6 As shown, this embodiment 1 provides a winding battery core unwinding device, including a winding needle 400 and a material taking clamp 02, and also includes a horizontal clamp 03 and a semi-detached structure 04, the horizontal clamp 03 is used to apply a clamping force to both sides of the battery core 01, the semi-detached structure 04 is used to release the internal stress of the battery core, and the semi-detached structure 4 is installed on a chassis 404 on the horizontal line of the winding needle 400;

[0036] The semi-detached structure 04 includes a first telescopic member 402 and a second telescopic member 403. The front end of the first telescopic member 402 is provided with a conical needle rolling nozzle 401. The front end of the needle rolling 400 is arranged in the needle rolling nozzle 401. A spring is arranged inside the first telescopic member 402. The first telescopic member 402 and the second telescopic member 403 are installed on the chassis 404. The first telescopic member 402 and the second telescopic member 403 are connected to the cylinder. The first telescopic member 402 and the second telescopic member 403 are telescopic in a direction parallel to the needle rolling 400.

[0037] The winding needle 400 is coated with an isolation tape 05 , and the isolation tape 5 is used to isolate the winding needle 400 from the diaphragm in the battery cell 01 .

[0038] like Figure 4 As shown, the horizontal clamp includes a first clamp plate 300 and a second clamp plate 301. The first clamp plate 300 has a first V-shaped groove 302 on its end side, and the second clamp plate 301 has a second V-shaped groove 303 on its end side. The surfaces of the first V-shaped groove 302 and the second V-shaped groove 303 are both provided with silicone.

[0039] The cross clamp 03 is detachably mounted on a lifting platform perpendicular to the bottom of the winding needle through screw holes and screws provided at its end.

[0040] like Figure 2 As shown, the material picking clamp includes a first fixing member 202 and a second fixing member 203. A first finger-shaped member 204 is provided at the end of the first fixing member 202, and a second finger-shaped member 205 is provided at the end of the second fixing member 203. A first silicone rubber 200 is provided on the surface of the first finger-shaped member 204, and a second silicone rubber 201 is provided on the surface of the second finger-shaped member 205. The material picking clamp 2 is also provided with a telescopic cylinder 207 and a strong and weak clamping cylinder 206.

[0041] like Figure 7 As shown, the isolation tape 05 includes a fluororesin film layer 500 and a silicone adhesive layer 501 .

[0042] The following is an explanation using the 473336 model of soft pack battery as an example.

[0043] like Figure 1 As shown, the battery cell 01 includes a positive electrode sheet 100, a negative electrode sheet 101, a left electrode tab 103 and a right electrode tab 104. The positive electrode sheet 100 and the negative electrode sheet 101 are separated by a diaphragm 102, and the diaphragm 102 is made of ceramic material.

[0044] The positive electrode sheet 100, the separator 102, and the negative electrode sheet 101 are fixed on the winding needle 400 in layers, and the winding needle 400 starts to rotate. With the rotation of the winding needle 400 and the feeding of the positive and negative electrode sheets and the separator, the battery cell 01 composed of the positive and negative electrode sheets and the separator is formed into a flat shape. After the winding is completed, the positive and negative electrode sheets and the separator are disconnected.

[0045] It is necessary to remove the wound battery cell 01 from the winding needle 400. Generally, the battery cell 01 is clamped by a material removal clamp, and then the winding needle 400 is driven by the winding needle retraction cylinder 409 to move away from the battery cell. The battery cell 01 is slowly pulled away from the winding needle 400. Since the winding needle 400 directly contacts the diaphragm 102, the innermost diaphragm 102 will be damaged and fail due to the friction between the winding needle 400, affecting the use.

[0046] In the present application, an isolation tape 5 is wound on the winding needle 400, and the isolation tape 5 includes a fluororesin film layer 500 and a silicone adhesive layer 501. The inner layer is the silicone adhesive layer 501 in contact with the winding needle 400, and the outer layer is the fluororesin film layer 500 in contact with the diaphragm in the battery cell 01, which can effectively reduce the friction in contact with the diaphragm and reduce damage to the diaphragm.

[0047] The material of the battery cell 01 is fixed on the winding needle 400, and the conical winding needle mouth 401 on the semi-detached structure 04 contacts the end of the winding needle 400, and the end of the winding needle 400 extends into the winding needle mouth 401, and the winding needle 400 starts to wind the battery cell material. After the battery cell 01 is wound, the spring in the first telescopic part 402 pops out, and the first telescopic part 402 moves with the winding needle mouth 401 away from the winding needle 400. The winding needle mouth 401 and the battery cell 01 are in a semi-detached state, and then the first telescopic part 402 and the second telescopic part 403 are driven by the cylinder to move away from the battery cell 01, and the winding needle mouth 401 is completely separated from the winding needle 400, and the internal stress of the battery cell 01 close to the winding needle mouth 401 is released. The battery cell was originally flat, and due to the release of internal stress, it becomes nearly circular, and the end of the battery cell 01 away from the winding needle mouth 401 is still flat, and the entire battery cell 01 is in an A-type state.

[0048] The lifting platform directly below the winding needle 400 is driven by the lifting platform cylinder 304 to approach the winding needle 400, and the horizontal clamp 03 on the lifting platform is close to the winding needle 400. The first clamp 300 and the second clamp 301 of the horizontal clamp 03 are respectively located on both sides of the battery cell 01, and the first V-shaped groove 302 on the first clamp 300 and the second V-shaped groove 302 on the second clamp 301 are respectively close to the rounded corners on both sides of the battery cell 01. Then, the distance between the first clamp 300 and the second clamp 301 is driven by the clamping cylinder 305 to apply a clamping force to both sides of the battery cell 01. The clamping force applied by the horizontal clamp 03 and the semi-detached structure 4 release all internal stresses on the battery cell 01, and the battery cell 01 bulges upward and downward. The shape of the battery cell 01 is close to a cylinder, and the gap between the center of the battery cell 01 and the winding needle 400 increases.

[0049] The surfaces of the first V-shaped groove 302 and the second V-shaped groove 303 are provided with silicone, which contacts the surface of the battery cell 01 through the silicone to avoid damaging the surface of the battery cell 01 during clamping.

[0050] The material picking clamp 02 drives the first silicone 200 and the second silicone 201 on the first finger-shaped member 204 and the second finger-shaped member 205 to be close to the upper and lower surfaces of the battery cell 01 respectively through the telescopic cylinder 207, and then drives the second finger-shaped member 204 and the second finger-shaped member 205 to apply a clamping force to the battery cell 01 through the strong and weak clamping cylinder 206. The end of the winding needle 400 away from the battery cell 01 passes through the winding needle shaft sleeve 406, and is clamped with the winding needle telescopic groove member 407 and the winding needle buckle member 408 to form an integral connection, and is wound on the winding needle. The retraction cylinder 409 is connected, and the winding needle sleeve 406 is set on the large plate 405. The winding needle 400 is driven by the winding needle retraction cylinder 409 to slowly move away from the battery cell 01. In the process of the winding needle 400 slowly moving away from the battery cell 01, the material picking clamp 02 applies alternating strong and weak clamping forces to the battery cell 01 through the strong and weak clamping cylinders 206. After the battery cell 01 is completely separated from the winding needle 400, the material picking clamp 2 places the battery cell 01 on the conveyor belt through the rotating motor 208 to complete the core retraction process.

[0051] The first and second finger-shaped members 204 and 205 are provided with first and second silicone rubbers 200 and 201 on their surfaces, respectively. The first and second silicone rubbers 200 and 201 are in contact with the upper and lower surfaces of the battery cell 01 to avoid damaging the surface of the battery cell 01 when a clamping force is applied to the battery cell 01 .

[0052] The use of the core-retracting device of the present application can reduce the damage of the winding needle to the internal diaphragm. First, the contact between the winding needle and the diaphragm is changed to the contact between the isolation tape and the diaphragm by wrapping the isolation tape on the winding needle, which reduces the friction of contact during core-retracting. Then, the core-retracting semi-detaching structure on the winding needle releases the internal stress of the battery cell, so that the interior of one end of the battery cell is separated from the winding needle. Then, the clamping force is applied to both sides of the battery cell by the horizontal clamp to increase the center space of the battery cell and separate it from the winding needle. Finally, the battery cell is taken out by the material removal clamp. Ensure that the internal diaphragm of the battery cell is not damaged.

[0053] Example 2

[0054] This embodiment provides a technical solution based on Embodiment 1, and a method for winding a battery core, comprising the following steps:

[0055] A. The cylinders on the first telescopic member 402 and the second telescopic member 403 move away from the winding needle 400, the spring inside the first telescopic member 402 pops out, and the conical winding needle mouth 401 at the end of the first telescopic member 402 moves away from the winding needle 400, and the winding needle mouth 401 and the battery cell 01 on the winding needle 400 are in a semi-detached state;

[0056] B. The second telescopic member 402 is driven by the cylinder to move away from the winding needle 400, and the second telescopic member 403 pulls the first telescopic member 402 to move, and the conical winding needle mouth 401 at the end of the first telescopic member 402 is completely disconnected from the battery cell, and the internal stress of the end of the battery cell 01 on the winding needle 400 close to the winding needle mouth 401 is released;

[0057] C. Then, a clamping force is applied to both sides of the battery cell 1 through the horizontal clamp 03, and the central pore of the battery cell 01 is enlarged;

[0058] D. The material removal clamp 02 clamps the battery cell 01, and the winding needle 400 slowly moves away from the battery cell 01, and the battery cell 01 is separated from the winding needle 400, and the battery cell 01 is placed on the conveyor belt.

[0059] Among them, after the material picking clamp 02 holds the battery cell 1, the strong and weak clamping cylinder 206 applies strong and weak alternating clamping forces to the battery cell.

[0060] The alternating strong and weak clamping forces can reduce the friction between the inside of the battery cell and the winding needle 400 during the slow movement of the winding needle 400, thereby avoiding damage to the internal diaphragm.

[0061] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A winding battery core unwinding device, comprising a winding needle and a material taking clamp, characterized in that: It also includes a horizontal clamp and a semi-detached structure, wherein the horizontal clamp is used to apply a clamping force to both sides of the battery cell, and the semi-detached structure is used to release the internal stress of the battery cell, and the semi-detached structure is installed on the chassis on the horizontal line of the winding needle; The semi-detachable structure comprises a first telescopic member and a second telescopic member, the front end of the first telescopic member is provided with a conical needle winding nozzle, the front end of the needle winding is arranged in the needle winding nozzle, a spring is arranged inside the first telescopic member, the first telescopic member and the second telescopic member are mounted on the chassis, the first telescopic member and the second telescopic member are connected to a cylinder, and the first telescopic member and the second telescopic member are telescopic in parallel to the needle winding direction; The winding needle is coated with an isolation tape, and the isolation tape is used to isolate the winding needle from the diaphragm in the battery cell.

2. The wound battery core unwinding device according to claim 1, characterized in that: The horizontal clamp shown includes a first clamping plate and a second clamping plate, the first clamping plate end side is provided with a first V-shaped groove, the second clamping plate end side is provided with a second V-shaped groove, the surfaces of the first V-shaped groove and the second V-shaped groove are both provided with silicone, and the first V-shaped groove and the second V-shaped groove apply clamping force to the rounded corners on both sides of the battery cell through a clamping cylinder.

3. The wound battery core unwinding device according to claim 2, characterized in that: The transverse clamp is detachably mounted on a lifting platform perpendicular to the lower side of the winding needle through screw holes and screws provided at the ends of the transverse clamp, and the lifting platform is controlled to move up and down by a lifting platform cylinder.

4. The wound battery core unwinding device according to claim 1, characterized in that: The material picking clamp comprises a first fixing member and a second fixing member, wherein a first finger-shaped member is disposed at an end of the first fixing member, and a second finger-shaped member is disposed at an end of the second fixing member.

5. The wound battery core unwinding device according to claim 4, characterized in that: The material picking clamp is also provided with a telescopic cylinder and a strong and weak clamping cylinder. The telescopic cylinder is used to drive the material picking clamp to move horizontally, and the strong and weak clamping cylinder is used to drive the opening and closing and the clamping strength of the first finger-shaped member and the second finger-shaped member.

6. The wound battery core unwinding device according to claim 4, characterized in that: A first silicone rubber is disposed on the surface of the first finger-shaped member, and a second silicone rubber is disposed on the surface of the second finger-shaped member.

7. The wound battery core unwinding device according to claim 1, characterized in that: The isolation tape comprises a fluororesin film layer and a silicon-based adhesive layer, wherein the silicon-based adhesive layer contacts the winding needle, and the fluororesin film layer contacts the separator in the battery core.

8. The wound battery core unwinding device according to claim 1, characterized in that: The material picking clamp is installed on the mechanical arm, and the material picking and placing of the material picking clamp is completed by the mechanical arm cylinder and the rotating motor.

9. A method for winding a battery core, characterized in that: The following steps are involved: A. The cylinders on the first telescopic member and the second telescopic member move away from the winding needle, the spring inside the first telescopic member pops out, and the conical winding needle mouth at the end of the first telescopic member moves away from the winding needle, and the winding needle mouth and the battery cell on the winding needle are in a semi-detached state; B. The second telescopic member is driven by the cylinder to move away from the winding needle. The second telescopic member pulls the first telescopic member to move. The conical winding needle nozzle at the end of the first telescopic member is completely disengaged from the battery cell, and the internal stress of the battery cell on the winding needle near the winding needle nozzle is released; C. Then, clamping force is applied to both sides of the battery cell through the horizontal clamp, and the central pore of the battery cell is enlarged; D. The material picking clamp holds the battery cell, and the winding needle slowly moves away from the battery cell. The battery cell is detached from the winding needle and placed on the conveyor belt.

10. The method for unwinding a wound battery according to claim 9, characterized in that: In the step D, after the material picking clamp clamps the battery cell, the strong and weak clamping cylinders apply strong and weak alternating clamping forces to the battery cell.

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