Clamping jaw type nail pulling device and nail pulling method applied to lithium battery manufacturing

Abstract

The invention provides a clamping jaw type nail pulling device applied to lithium battery manufacturing and a nail pulling method. The nail pulling device comprises a hollow cylinder body, a piston cavity and a second air inlet channel are formed in the hollow cylinder body, a first air inlet channel and a first exhaust channel are formed in a first seat body, and a plurality of clamping jaws which are circumferentially distributed are arranged at the end of a nail pulling assembly; the plug pin can be clamped into a clamping space defined by the multiple clamping jaws. When the end part of the first sealing piece is in sealing contact with the top of the battery shell, the first air inlet channel is inflated, so that the air pressure in the first air inlet channel is matched with the air pressure in the battery shell, and then the second air inlet channel is inflated, so that the piston rod and the clamping jaw assembly can be driven to move in a direction far away from the battery shell, and the plug pin is separated from the battery shell; in the process that the plug pin is separated from the battery shell, the air pressure around the plug pin is basically the same as the air pressure in the battery shell, the splashing amount of liquid in the battery in the pin pulling process can be reduced, and a large amount of liquid in the battery is prevented from splashing.

Description

Technical Field

[0001] This application relates to the field of lithium battery production equipment technology, and in particular to a gripper-type nail-removing device and method for use in lithium battery manufacturing. Background Technology

[0002] The lithium battery manufacturing process involves steps such as electrolyte injection and encapsulation. In the electrolyte injection step, electrolyte or other active materials need to be injected into the cell multiple times. This injection process is completed through the injection port of the battery casing, which is usually sealed with a plug. After the cell is injected, the internal electrolyte contains volatile and reactive components, such as organic solvents. During subsequent movement or resting, trace chemical reactions may occur, generating gas and increasing the internal pressure of the battery casing, making the internal gas pressure higher than the external environment. Therefore, during the removal of the plug, the instantaneous pressure release can cause electrolyte to splash from the injection port, corroding production line equipment, contaminating the cell casing, and even causing safety accidents. Simultaneously, during removal, the plug may deform under stress, leading to damage. While some manufacturers require the plug to be reusable a certain number of times, current technology often results in severe damage after only a few uses, resulting in a short lifespan and failing to meet the required number of reusable cycles. Summary of the Invention

[0003] To address the aforementioned technical problems, this application provides a gripper-type nail-removing device and method for use in lithium battery manufacturing.

[0004] In a first aspect, this application provides a gripper-type nail-removing device for lithium battery manufacturing, comprising a cylinder, a first seat, a second seat, a nail-removing assembly, a first seal, and an air passage connector. The cylinder, the first seat, and the second seat are connected in sequence; the first sealing member is sleeved on one end of the second seat and extends away from the end face of the second seat, and the end of the first sealing member can make sealing contact with the top of the battery case; the air passage connecting member is sleeved inside the first sealing member. The first housing has a first intake channel and a first exhaust channel; the cylinder is hollow to form a piston chamber, and a second intake channel communicating with the piston chamber is formed on the cylinder; valves for controlling the opening and closing of the channels are provided at the first intake channel, the second intake channel, and the first exhaust channel; a connecting air passage is provided on the air passage connector; the first intake channel, the connecting air passage, and the first exhaust channel are interconnected. The pin-pulling assembly is movably sleeved within the cylinder, the first seat, and the air passage connector; the end of the pin-pulling assembly is provided with multiple circumferentially arranged grippers; when the pin-pulling device moves toward the plug along the axial direction of the plug, the plug can be engaged in the clamping space formed by the multiple grippers; by filling the piston chamber with air through the second air intake channel, the pin-pulling assembly can be driven to move away from the battery casing, so that the plug can be disengaged from the battery casing.

[0005] In some embodiments of this application, the nail-pulling assembly includes a piston assembly, a piston rod, and a gripper assembly; the piston assembly is sleeved on one end of the piston rod; the gripper assembly is disposed on the other end of the piston rod; and the piston rod is sealed to the first seat.

[0006] In some embodiments of this application, the gripper assembly includes a gripper support and a plurality of grippers; the gripper support is fixed to the end of the piston rod, and the plurality of grippers are arranged circumferentially around the gripper support.

[0007] In some embodiments of this application, the gripper includes a first segment connected to a gripper support; the first segment extends in a direction away from the gripper support while protruding radially outward to form a second segment; the second segment extends radially toward the center to form a third segment.

[0008] In some embodiments of this application, the air passage connector includes a body extending axially, the outer periphery of the body extending radially to form a mounting flange; the body includes an inner wall and an outer wall, the inner wall enclosing a movable cavity for the movement of the pin-pulling assembly; a plurality of circumferentially arranged air passages are formed between the outer wall and the inner wall.

[0009] In some embodiments of this application, the inner wall gradually converges from one end near the first seat towards the axis, forming an inner wall protrusion; the inner wall protrusion divides the movable cavity into a cone-shaped first movable cavity and a second movable cavity.

[0010] In some embodiments of this application, the cylinder block is further provided with an overflow channel.

[0011] In some embodiments of this application, the first seal is made of a flexible material, and the free end of the first seal extends beyond the end of the air passage connector to form a protrusion for sealing contact with the battery case.

[0012] In some embodiments of this application, the airway connector is made of a non-metallic material; the gripper is made of a metallic material.

[0013] A second aspect of this application provides a method for removing staples using a gripper-type staple removal device in lithium battery manufacturing, the method comprising the following steps: Step S1: The nail removal device moves toward the plug along the axial direction of the plug, so that the end of the plug is engaged in the clamping space formed by the multiple jaws, and the protruding part of the first seal makes sealing contact with the top of the battery case. Step S2: Inflate the first air intake channel with air; Step S3: When the air pressure in the first air intake channel matches the air pressure in the battery case, air is injected into the second air intake channel. The piston assembly drives the piston rod and the gripper assembly to move away from the battery case, so that multiple grippers converge towards the center, clamp the plug, and cause the plug to detach from the battery case. Step S4: Continue to inflate the first air intake channel and stop inflating after a preset time; Step S5: Remove the plug.

[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects: The clamp-type pin-removing device for lithium battery manufacturing of this application includes a cylinder, a first seat, a second seat, a pin-removing assembly, a first seal, and an air passage connector. The cylinder is hollow, forming a piston chamber and a second air intake channel communicating with the piston chamber. The first seat has a first air intake channel and a first exhaust channel. The end of the pin-removing assembly has multiple clamps arranged in a circular pattern. When the pin-removing device moves toward the pin along the axial direction of the pin, the pin can be engaged in the clamping space formed by the multiple clamps. Within the chamber, the pin-removing device continues to move. When the end of the first seal contacts the top of the battery casing, air is pumped into the first air intake channel, matching the air pressure inside the channel with that inside the battery casing. Then, air is pumped into the second air intake channel, driving the piston rod and gripper assembly to move away from the battery casing, causing the pin to detach. During this process, the air pressure around the pin is essentially the same as the pressure inside the battery casing, reducing the amount of liquid splashing from the battery and preventing excessive liquid leakage. Simultaneously, the pin is minimally damaged during removal, extending its lifespan.

[0015] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this document. Attached Figure Description

[0016] The accompanying drawings, which form part of this document, are used to provide a further understanding of the document. The illustrative embodiments and descriptions herein are used to explain the document and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a gripper-type pin-removing device for lithium battery manufacturing provided in an exemplary embodiment of this application; Figure 2This is a front view of a gripper-type pin-removing device for lithium battery manufacturing provided in an exemplary embodiment of this application; Figure 3 This is the book Figure 2 Sectional view at point AA; Figure 4 This is an enlarged view within the dashed box in the image; Figure 5 This is a side view of a gripper-type pin-removing device for lithium battery manufacturing provided in an exemplary embodiment of this application; Figure 6 This is a schematic diagram of the structure of a screw-pulling assembly provided in an exemplary embodiment of this application; Figure 7 This is a flowchart of a nail removal method provided in an exemplary embodiment of this application; Figure 8 This is a diagram showing the forces acting on the plug during the process of pulling it out.

[0017] In the diagram: 10A, battery casing; 10B, plug; 10, cylinder; 101, piston chamber; 102, second intake passage; 103, detection switch; 104, overflow passage; 20, first seat; 201, first intake passage; 202, first exhaust passage; 30, second seat; 40, first seal; 50, air passage connector; 501, connecting air passage; 502, inner wall protrusion; 60, plug assembly; 601, piston assembly; 602, piston rod; 603, gripper assembly; 70, sealing seat; 80, pad. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0019] The lithium battery manufacturing process involves steps such as electrolyte injection and encapsulation. In the electrolyte injection process, electrolyte or other active materials need to be injected into the cell multiple times. This injection process must be completed through the injection port of the casing, which is usually sealed with a plug.

[0020] After the battery cell is filled with electrolyte, the internal electrolyte contains volatile and reactive components, such as organic solvents. During subsequent movement or resting, trace chemical reactions may occur, producing gas. This increases the internal pressure of the battery casing, causing the internal gas pressure to be higher than the external environment. Therefore, during the removal of the plug, the instantaneous pressure release can cause electrolyte to splash from the injection port, corroding production line equipment, contaminating the battery cell casing, and even causing safety accidents.

[0021] Based on this, an exemplary embodiment of this application provides a gripper-type pin-removing device and a pin-removing method for lithium battery manufacturing. The pin-removing device includes a cylinder, a first seat, a second seat, a pin-removing assembly, a first seal, and an air passage connector. The cylinder is hollow, forming a piston chamber and a second air intake channel communicating with the piston chamber. The first seat has a first air intake channel and a first exhaust channel. The end of the pin-removing assembly has multiple grippers arranged circumferentially. When the pin-removing device moves toward the plug along the axial direction of the plug, the plug can be engaged in the clamping space formed by the multiple grippers. The pin-removing device continues to move, and when the first... When the end of a sealing element makes sealing contact with the top of the battery casing, air is injected into the first air intake channel, making the air pressure in the first air intake channel match the air pressure inside the battery casing. Then, air is injected into the second air intake channel, which drives the piston rod and the gripper assembly to move away from the battery casing, causing the plug to detach from the battery casing. During the process of the plug detaching from the battery casing, the air pressure around the plug is basically the same as the air pressure inside the battery casing, which can reduce the amount of liquid splashing inside the battery during the plug removal process and prevent a large amount of liquid from splashing out of the battery. At the same time, the plug is less damaged during the removal process, which improves the life of the plug.

[0022] Example 1: An exemplary embodiment of this application provides a gripper-type nail-pulling device, such as... Figures 1 to 5 As shown, the nail removal device includes a cylinder 10, a first seat 20, a second seat 30, a nail removal assembly 60, a first seal 40, and an air passage connector 50; wherein the cylinder 10, the first seat 20, and the second seat 30 are sequentially and sealingly connected; a second exhaust passage (not shown in the figure) is provided at the end of the cylinder 10 away from the first seat 20; preferably, the second seat 30 can be a pressure sleeve. The first seal 40 is sleeved on one end of the second seat 30 and extends in a direction away from the end face of the second seat 30; the air passage connector 50 is sleeved inside the first seal 40.

[0023] like Figure 3 and 4As shown, a central hole is formed on the first housing 20, extending through the first housing 20 in a first direction. Simultaneously, a first intake passage 201 extending in a second direction is also formed on the first housing 20, and the first intake passage 201 and the central hole are interconnected. Preferably, the first direction is the axial direction of the cylinder block 10, and the second direction is a direction perpendicular to the first direction. A first exhaust passage 202 is formed on the first housing 20. Exemplarily, the first exhaust passage 202 includes a first exhaust passage section extending in the first direction and a second exhaust passage section extending in the second direction, which are interconnected.

[0024] Preferably, the nail removal device further includes a pad 80 disposed on top of the first seal 40 to improve the overall structural strength and stability. In order to improve the sealing performance of the cylinder 10, a sealing seat 70 is also sealed in the piston chamber 101, and the bottom of the sealing seat 70 is sealed to the first seat 20.

[0025] The air passage connector 50 includes an axially extending body, the outer periphery of which extends radially to form a mounting flange; the mounting flange is mounted on a pad 80 to form a secure installation. The body includes an inner wall and an outer wall, the inner wall enclosing a movable cavity for the movement of the pin-pulling assembly; a plurality of circumferentially arranged connecting air passages 501 are formed between the outer wall and the inner wall. The first air intake passage 201, the central hole, the connecting air passages 501, and the first exhaust passage 202 are interconnected, allowing gas to enter from the first air intake passage 201, flow through the central hole and the connecting air passages 501, and finally enter the first exhaust passage 202. The inner wall of the air passage connector 50 gradually converges towards the axis from one end near the first seat 20, forming an inner wall protrusion; the inner wall protrusion 502 divides the movable cavity into a conical first movable cavity and a second movable cavity.

[0026] The cylinder body 10 is hollow, forming a piston chamber 101. The piston chamber 101 is divided into an upper piston chamber 101A and a lower piston chamber 101B. A spring is also provided in the upper piston chamber 101A, with both ends of the spring abutting against the pin-pulling assembly 60 and the inner wall of the upper piston chamber 101A, respectively. A second intake passage 102 communicating with the lower piston chamber 101B is also formed on the cylinder body 10. For example, the second intake passage 102 is located above the first exhaust passage 202 and includes a first section passage extending in a second direction and a second section passage extending in a first direction that are interconnected. The second intake passage 102 communicates with the lower piston chamber 101B, and gas can enter the lower piston chamber 101B when the second intake passage 102 is filled with gas. A valve body for controlling the opening and closing of the passage is provided at the first intake passage 201, the second intake passage 102, and the first exhaust passage 202.

[0027] The pin-pulling assembly 60 passes through the central hole of the first seat 20 and is movably sleeved within the cylinder 10, the first seat 20, and the air passage connector 50. A seal is provided between the pin-pulling assembly 60 and the sealing seat 70 to prevent gas in the first air intake passage 201 from flowing into the lower piston chamber 101B.

[0028] The pin-removing assembly 60 includes a piston assembly 601, a piston rod 602, and a gripper assembly 603. The piston assembly 601 is sleeved on one end of the piston rod 602 and fixedly connected to it. The outer periphery of the piston assembly 601 is in sealed contact with the inner wall of the cylinder 10 through a seal. The gripper assembly 603 is located at the other end of the piston rod 602. The gripper assembly 603 includes a gripper support 6031 and a plurality of grippers 6032. The gripper support 6031 is fixedly connected to the end of the piston rod 602, and the plurality of grippers 6032 are arranged around the circumference of the gripper support 6031 to form a gripping space for holding the plug pin 10B. For example, there are four grippers 6032, which are evenly distributed around the circumference of the gripper support 6031.

[0029] like Figure 6 As shown, the gripper 6032 includes a first segment connected to the gripper support 6031; the first segment extends away from the gripper support 6031 while protruding radially outward to form a second segment; the second segment extends radially towards the center to form a third segment. Preferably, the gripper 6032 is made of metal, which gives the gripper strong wear resistance, and at the same time, the gripper 6032 also has a certain degree of elastic deformation.

[0030] like Figure 4 As shown, the plug 10B has a conical top, and the second section of the gripper 6032 encloses and forms a clamping space to accommodate the conical top of the plug 10B. When the plug removal device moves toward the plug 10B along the axial direction of the plug 10B, the plug 10B can enter the clamping space; when the gripper 6032 moves upward, under the action of the protrusion 502 on the inner wall of the air passage connector 50, the gripper 6032 converges toward the center and clamps the plug 10B, and further movement causes the plug 10B to detach from the battery case 10A.

[0031] A gas passage is formed between the piston rod 602 and the first seat 20 for gas flow; a gas passage is also formed between the outer periphery of the gripper assembly 603 and the inner wall of the gas passage connector 50, so that the gas entering the first intake passage 201 can flow sequentially through the gas passage between the piston rod 602 and the first seat 20, the gas passage between the gripper assembly 603 and the gas passage connector 50, and the connecting gas passage 501 inside the gas passage connector 50, and finally enter the first exhaust passage 202.

[0032] The first seal 40 is made of a flexible material, such as rubber, and its free end extends beyond the end of the air passage connector 50 to form a protrusion for sealing the contact battery case 10A. When the pin-removing device is in its initial state, the bottom of the piston assembly 601 contacts the top of the sealing seat 70, and the gripper assembly 603 extends beyond the end of the first seal 40. When the pin-removing device moves towards the plug 10B along the axial direction of the plug 10B, the grippers 6032 first contact the plug 10B; continuing to move towards the battery casing 10A, the conical top of the plug 10B enters the clamping space formed by the multiple grippers 6032; continuing to move towards the battery casing 10A, the bottom of the first seal 40 contacts the top of the battery casing 10A, and after further movement, the first seal 40 is pressed tightly against the top of the battery casing 10A, forming a sealed contact; when air is injected into the first air inlet channel 201, the gas can flow towards the first exhaust channel 202, which is in a closed state, thereby increasing the air pressure around the plug 10B. When the air pressure rises to be basically the same as the air pressure inside the battery casing 10A, the pin removal begins. For example, the pressure inside the battery casing 10A can be tested during the battery production process or calculated based on production experience.

[0033] Air is introduced into the downward piston chamber 101B through the second air intake channel 102, causing the piston assembly 601 to move away from the first seat 20. This, in turn, drives the pin-removing assembly 60 to move away from the battery casing 10A, causing the plug pin 10B to move away from the battery casing 10A, thus detaching the plug pin 10B from the battery casing 10A. During the pin removal process, the air pressure around the plug pin 10B is basically the same as the air pressure inside the battery casing 10A. This reduces the amount of liquid splashing from inside the battery during the pin removal process, preventing excessive splashing of liquid from inside the battery.

[0034] Preferably, the cylinder block 10 is also provided with an overflow channel 104, which is located above the first exhaust channel 202, below the second intake channel 102, and extends in the second direction; when the air pressure around the plug 10B is too high, the gas can squeeze the seal between the piston rod 602 and the sealing seat 70, enter the overflow channel 204, and be discharged through the overflow channel 204 without entering the lower piston chamber 101B.

[0035] Because the gap between the air passage connector 50 and the gripper 6032 is small, if the coaxiality between the air passage connector 50 and the gripper 6032 is insufficient during the pin removal process, friction will occur. If both the air passage connector 50 and the gripper 6032 are made of metal, metal debris will be generated during the pin removal process. After the plug 10B is removed from the battery casing 10A, the metal debris may enter the battery casing 10A through the electrolyte inlet. The electrolyte stored inside the battery casing 10A will react with the metal debris, causing electrolyte contamination and reducing battery performance and lifespan. Therefore, in this application, the air passage connector 50 is made of non-metallic materials such as engineering wear-resistant plastic or rubber; the gripper 6032 is made of metal and the hardness of the gripper 6032 is greater than that of the air passage connector 50 to avoid friction between the two to generate metal debris.

[0036] Example 2: An exemplary embodiment of this application provides a method for removing nails using the gripper-type nail-removing device described in Embodiment 1 above, such as... Figure 7 As shown, the nail removal method includes the following steps: In step S1, the nail removal device moves toward the plug 10B along the axial direction of the plug 10B. The nail removal rod 603 first contacts the plug 10B, so that the end of the plug 10B is engaged in the clamping space formed by the multiple grippers 6032. The nail removal device continues to move toward the plug 10B along the axial direction of the plug 10B, so that the protruding part of the first seal 40 makes a sealing contact with the top of the battery case 10A. Step S2: Close the first exhaust passage 202, forming a sealed space around the plug 10B, and fill the first air intake passage 201 with gas; the gas flows through the central hole and the connecting air passage 501 in sequence, and finally enters the first exhaust passage 202, causing the air pressure around the plug 10B to continuously increase. Step S3: When the air pressure in the first air intake channel 201, i.e. the air pressure around the plug 10B, matches the air pressure in the battery case 10A, air is injected into the second air intake channel 102 to drive the piston assembly 601 to move. The piston assembly 601 drives the piston rod 603 and the gripper assembly 603 to move away from the battery case 10A, so that multiple grippers 6032 converge towards the center to grip the plug 10B. Further movement occurs when the top of the piston assembly 601 contacts the top wall of the lower piston chamber 101B, at which point the plug 10B disengages from the battery case 10A. Step S4: After the plug 10B detaches from the battery casing 10A, the gas inside the battery casing 10A will overflow. At this time, open the first exhaust channel 202 and continue to inflate the first air intake channel 201 to remove the overflowing gas and prevent it from remaining on the battery casing 10A and contaminating it. After inflating for a preset time, stop inflating. All the overflowing gas has been removed. At this time, inflating can be stopped.

[0037] Step S5: Remove the plug 10B. After the plug removal device is lifted by other devices and detached from the battery casing, the second air intake channel 102 opens, causing the lower piston chamber 101B to depressurize. Under the action of the spring, the piston assembly returns to its initial state, driving the gripper assembly 603 to move away from the first seat 20, causing the grippers 6032 to move away from each other, and the plug 10B is dislodged from the clamping space formed by the grippers 6032.

[0038] In steps S2 and S4, the first exhaust passage 202 can remain open. In step S2, the exhaust flow rate of the first exhaust passage 202 is smaller than the intake flow rate of the first intake passage 201, so that the air pressure around the plug 10B matches the air pressure inside the battery casing 10A. In step S4, the exhaust flow rate of the first exhaust passage 202 can match the intake flow rate of the first intake passage 201.

[0039] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0040] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its spirit and scope. Thus, if these modifications and modifications fall within the scope of the claims of this application and their equivalents, the intent of this application also includes these modifications and modifications.

Claims

1. A gripper-type pin-removing device for lithium battery manufacturing, characterized in that, It includes a cylinder block, a first seat, a second seat, a pin-pulling assembly, a first seal, and an air passage connector; The cylinder, the first seat, and the second seat are connected in sequence; the first sealing member is sleeved on one end of the second seat and extends away from the end face of the second seat, and the end of the first sealing member can make sealing contact with the top of the battery case; the air passage connecting member is sleeved inside the first sealing member. The first housing has a first air intake passage and a first exhaust passage formed thereon; The cylinder body is hollow to form a piston chamber, and a second intake channel communicating with the piston chamber is formed on the cylinder body; valve bodies for controlling the opening and closing of the channels are provided at the first intake channel, the second intake channel, and the first exhaust channel; a connecting air passage is provided on the air passage connector; the first intake channel, the connecting air passage, and the first exhaust channel are interconnected. The pin-pulling assembly is movably sleeved within the cylinder, the first seat, and the air passage connector; the end of the pin-pulling assembly is provided with multiple circumferentially arranged grippers; when the pin-pulling device moves toward the plug along the axial direction of the plug, the plug can be engaged in the clamping space formed by the multiple grippers; by filling the piston chamber with air through the second air intake channel, the pin-pulling assembly can be driven to move away from the battery casing, so that the plug can be disengaged from the battery casing.

2. The gripper-type nail-removing device for lithium battery manufacturing according to claim 1, characterized in that, The nail-pulling assembly includes a piston assembly, a piston rod, and a gripper assembly; the piston assembly is sleeved on one end of the piston rod; the gripper assembly is located on the other end of the piston rod; and the piston rod is sealed to the first seat.

3. The gripper-type nail-removing device for lithium battery manufacturing according to claim 2, characterized in that, The gripper assembly includes a gripper support and a plurality of grippers; the gripper support is fixed to the end of the piston rod, and the plurality of grippers are arranged circumferentially around the gripper support.

4. The gripper-type nail-removing device for lithium battery manufacturing according to claim 3, characterized in that, The gripper includes a first segment connected to a gripper support; the first segment extends away from the gripper support while protruding radially outward to form a second segment; the second segment extends radially toward the center to form a third segment.

5. The gripper-type nail-removing device for lithium battery manufacturing according to claim 1, characterized in that, The air passage connector includes a body extending axially, the outer periphery of which extends radially to form a mounting flange; the body includes an inner wall and an outer wall, the inner wall enclosing a movable cavity for the movement of the pin-pulling assembly; and a plurality of circumferentially arranged air passages are formed between the outer wall and the inner wall.

6. The gripper-type nail-removing device for lithium battery manufacturing according to claim 5, characterized in that, The inner wall gradually converges from one end near the first seat towards the axis, forming an inner wall protrusion; the inner wall protrusion divides the movable cavity into a cone-shaped first movable cavity and a second movable cavity.

7. The gripper-type nail-removing device for lithium battery manufacturing according to claim 1, characterized in that, The cylinder block is also provided with an overflow channel.

8. The gripper-type nail-removing device for lithium battery manufacturing according to claim 1, characterized in that, The first seal is made of a flexible material, and the free end of the first seal extends beyond the end of the air passage connector to form a protrusion for sealing contact with the battery case.

9. The gripper-type nail-removing device for lithium battery manufacturing according to claim 1, characterized in that, The airway connector is made of non-metallic material; the grippers are made of metallic material.

10. A method for removing a nail from a gripper-type nail-removing device used in lithium battery manufacturing as described in any one of claims 1 to 9, characterized in that, The method includes the following steps: Step S1: The nail removal device moves toward the plug along the axial direction of the plug, so that the end of the plug is engaged in the clamping space formed by the multiple jaws, and the protruding part of the first seal makes sealing contact with the top of the battery case. Step S2: Inflate the first air intake channel with air; Step S3: When the air pressure in the first air intake channel matches the air pressure in the battery case, air is injected into the second air intake channel. The piston assembly drives the piston rod and the gripper assembly to move away from the battery case, so that multiple grippers converge towards the center, clamp the plug, and cause the plug to detach from the battery case. Step S4: Continue to inflate the first air intake channel and stop inflating after a preset time; Step S5: Remove the plug.

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