A lithium battery assembling clamp

Abstract

The present application relates to the technical field of clamp device, specifically to a clamp for lithium battery assembly, which comprises a grabbing arm, the bottom end of the grabbing arm is provided with two clamping jaws, the bottom end of the clamping jaw is fixedly provided with a support plate, the side of the two support plates away from each other is detachably provided with a sealing cover, and the side of the two support plates close to each other is provided with an isolation film, the inner end of the isolation film is fixedly provided with a baffle, the surface of the baffle is fixedly provided with a plurality of support cylinders, the end of the support cylinder close to the isolation film is fixedly provided with a ball cover, the ball cover and the support cylinder are filled with magnetic powder, and the inside of the support cylinder is provided with a center cylinder, the flexible force mode formed by the guide cylinder, the resistance plug and the traction line makes the ball cover deform when being extruded by the swelling of the battery cell, the traction line is temporarily relaxed, but can be tightened again under the action of the internal negative pressure, thereby providing a controllable redundant stroke for the swelling of the battery cell, and avoiding the hard extrusion or structural damage caused by the volume growth of the battery during the formation, distribution and other stages.

Description

Technical Field

[0001] This invention relates to the field of clamping device technology, specifically a clamping device for assembling lithium batteries. Background Technology

[0002] With the widespread application of lithium-ion batteries in new energy vehicles, portable electronic devices and energy storage systems, the assembly precision and reliability of battery modules have gradually become key factors affecting product performance and safety. During the cell assembly process, individual cells need to be arranged, pressed, positioned and fixed to ensure that the gaps between cells are uniform, the tabs are aligned, and that a stable assembly state is maintained in subsequent welding, connection and packaging processes.

[0003] Most existing lithium battery clamping devices adopt fixed or simple elastic limiting structures, which achieve a certain degree of buffering through springs, rubber pads or metal sheets. However, conventional elastic elements tend to reach their limit stroke when the battery continues to expand, which cannot provide effective redundancy space for subsequent volume growth, thus causing the battery cell to be over-compressed. At the same time, the clamping force usually decreases significantly with the compression of the elastic element, and cannot maintain a stable clamping state during dynamic expansion, affecting the consistency of the battery cell testing environment. Therefore, this application proposes a clamp for lithium battery assembly. Summary of the Invention

[0004] The purpose of this invention is to provide a fixture for assembling lithium batteries to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a clamp for assembling lithium batteries, comprising a gripper arm, two grippers mounted at the bottom end of the gripper arm, a support plate fixedly mounted at the bottom end of the grippers, a sealing cap detachably mounted on the side of the two support plates that are far apart from each other, and a separator membrane mounted on the two sides that are close to each other, a baffle fixedly mounted on the inner end of the separator membrane, a plurality of support cylinders fixedly mounted on the surface of the baffle, the plurality of support cylinders being arranged in a rectangular array, and a ball cap fixedly mounted on the end of each support cylinder near the separator membrane, magnetic powder being filled between the ball cap and the support cylinder, and a central cylinder passing through the inside of the support cylinder.

[0006] As a further embodiment of the present invention, a movable cylinder is provided on the side of the support cylinder away from the isolation membrane, and multiple drive rods are rotatably installed on the inner end of the sealing cover. Each drive rod corresponds to multiple support cylinders arranged in an array. Multiple top blocks are sleeved on the surface of the drive rods, and the surface of the top blocks contacts the surface of the movable cylinder. By setting the movable cylinder on the side of the support cylinder away from the isolation membrane, and using the multiple drive rods and their corresponding top blocks at the inner end of the sealing cover to apply force to the movable cylinder, each support cylinder can form an independent and adjustable flexible force-bearing mechanism.

[0007] As a further embodiment of the present invention, an electromagnetic switch is fixedly installed on the inner end of the sealing cover, a driving cylinder is sleeved on the surface of the driving rod, a driven gear is fixedly installed on the side of the top block near the driving cylinder, the telescopic end of the electromagnetic switch is rotatably connected to the driving cylinder, and the inner wall of the driving cylinder is provided with a toothed groove structure that meshes with the driven gear. By setting an electromagnetic switch on the inner end of the sealing cover and rotatably connecting its telescopic end to the driving cylinder, the driving cylinder can selectively mesh with the driven gear along the axial direction of the driving rod under the control of the electromagnetic switch. After the toothed groove structure on the inner wall of the driving cylinder meshes with the driven gear, precise control of the driving angle of the top block is achieved.

[0008] As a further embodiment of the present invention, the central cylinder is rotatably connected to the movable cylinder, a drive cylinder is fixedly installed at the inner end of the support cylinder, the drive cylinder is sleeved on the outside of the central cylinder, an electromagnetic coil is fixedly installed at the inner end of the drive cylinder, and a stirring plate is fixedly installed at the end of the central cylinder away from the drive cylinder. By setting a drive cylinder sleeved on the outside of the central cylinder at the inner end of the support cylinder, and fixing an electromagnetic coil inside the drive cylinder, the metal stirring plate at the far end of the central cylinder generates an electromagnetic induction effect after the electromagnetic coil is energized, thereby attracting and disturbing the distribution of magnetic powder. In this way, the aggregation state of magnetic powder in the spherical cover can be adjusted according to the on / off state and strength of the electromagnetic coil, so that the magnetic powder filling density and the overall stiffness of the spherical cover can be controlled to change.

[0009] As a further embodiment of the present invention, a passive impeller is fixedly installed at the inner end of the central cylinder, and the passive impeller is sleeved on the outer wall of the central tube. A guide cylinder is provided through the inner end of the central tube. By setting a passive impeller sleeved on the outer wall of the central tube at the inner end of the central cylinder and providing a guide cylinder inside the central tube, the hydraulic oil or magnetic powder carrier liquid inside the support cylinder can drive the passive impeller to rotate during the circulation process, thereby driving the stirring plate inside the central cylinder to achieve passive disturbance.

[0010] As a further embodiment of the present invention, a resistance plug is provided through the inner end of the guide cylinder, and the outer peripheral edge of the resistance plug is in close contact with the inner wall of the central tube. Multiple traction lines are fixedly installed on the inner wall of the ball cover. The traction lines are arranged in a ring shape, and the free end of each traction line is fixedly connected to the outer surface of the resistance plug.

[0011] As a further embodiment of the present invention, a central tube is inserted inside the central cylinder, and a backflow cover is fixedly installed at the inner end of the movable cylinder. The backflow cover is connected to the central cylinder, and an input pipe is fixedly connected to the surface of the backflow cover. A return pipe is fixedly connected to the surface of the support cylinder. By inserting a central tube inside the central cylinder and setting a backflow cover connected to the central cylinder at the inner end of the movable cylinder, an independent and circulating fluid channel is formed inside the support cylinder. An input pipe is set outside the backflow cover, and a return pipe is set on the outer wall of the support cylinder. A stable fluid circulation path can be formed under the action of the circulating pump, so that the magnetic powder carrier liquid inside the support cylinder can flow continuously. This not only effectively avoids magnetic powder deposition at the bottom, but also improves the uniform distribution of magnetic powder around the spherical cover.

[0012] As a further embodiment of the present invention, two guide pipes are fixedly installed on the inner end of the sealing cover. One guide pipe is connected to the input pipe, and the other is connected to the return pipe. By setting two guide pipes connected to the input pipe and the return pipe respectively on the inner end of the sealing cover, a closed and independent circulating fluid loop can be formed inside the support cylinder. This enables the stable input and return of the magnetic powder carrier liquid under the drive of the circulating pump, improves the internal fluid circulation efficiency, and keeps the magnetic powder in a uniform flow state in the support cylinder and spherical cover area, thereby preventing the magnetic powder from settling due to static deposition.

[0013] As a further embodiment of the present invention, a pull rod is inserted inside the central tube, and the pull rod is fixedly connected to the guide cylinder. The end of the pull rod away from the guide cylinder is exposed on the outside of the movable cylinder. An arc plate is fixedly installed on the inner end of the top block, and a protruding rod is fixedly installed on the end of the pull rod, which rests on the surface of the arc plate. By inserting the pull rod inside the central tube and fixing it to the guide cylinder, the axial movement of the guide cylinder is accurately transmitted through the pull rod. At the same time, the end of the pull rod away from the guide cylinder is exposed on the outside of the movable cylinder, and its end is provided with a protruding rod that rests on the surface of the arc plate on the inner side of the top block, so that when the eccentric top block rotates, the motion can be converted into the axial movement of the pull rod through the arc plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The present invention uses a flexible force-bearing method consisting of a guide cylinder, a resistance plug, and a traction line. When the ball cover is deformed by the expansion and compression of the battery cell, the traction line may loosen briefly, but it can tighten again under the internal negative pressure. This provides a controllable redundant stroke for the expansion of the battery cell and avoids hard compression or structural damage caused by the volume increase of the battery during the formation and capacity testing stages.

[0016] 2. The present invention uses an adjustable flexible clamping method composed of an eccentric top block, a movable cylinder and magnetic powder inside the support cylinder. During the battery expansion process, the contact state between the ball cover and the magnetic powder can be automatically adjusted so that the ball cover has both flexible buffering ability and will not lose clamping force due to expansion.

[0017] 3. The present invention uses an electromagnetic switch to control the connection between the drive cylinder and the passive gear, so that the relative position of the stirring plate and the magnetic powder inside each support cylinder 105 can be adjusted individually, thereby realizing the ability to control the array clamping unit in sections. According to the expansion characteristics of the cell at different stages such as formation, capacity testing, and resting, the corresponding expansion area can be flexibly restricted or released, improving the process adaptability.

[0018] 4. When the present invention is working, the displacement and stirring action of the stirring plate can change the magnetic powder distribution density, thereby adjusting the fluidity and filling degree of the magnetic powder inside the ball cover, so that the rigidity of the ball cover can switch between soft absorption and relatively hard support, and thus can adjust the contact hardness in real time according to the battery status, ensuring safe clamping and buffering expansion stress. Attached Figure Description

[0019] Figure 1 A schematic diagram of a fixture used for assembling lithium batteries;

[0020] Figure 2 This is a schematic diagram of the internal structure of the separator membrane.

[0021] Figure 3 This is an enlarged structural diagram of the support cylinder.

[0022] Figure 4 This is a structural diagram of the top block;

[0023] Figure 5 This is a schematic diagram of the internal structure of the support cylinder;

[0024] Figure 6 This is a schematic diagram of the internal structure of the spherical cover;

[0025] Figure 7 This is a schematic diagram of the internal structure of the central cylinder and central tube.

[0026] Figure 8 This is a schematic diagram of the rack and driven gear ring.

[0027] Figure 9 for Figure 3 A schematic diagram of the structure at point A in the middle.

[0028] In the diagram: 1. Grab arm; 2. Gripper; 3. Support plate;

[0029] 101. Sealing cap; 102. Isolation membrane; 103. Baffle; 104. Isolation plate; 105. Support cylinder; 106. Ball cap; 107. Return pipe; 108. Limiting plate; 109. Return spring; 110. Pull rod; 111. Movable cylinder;

[0030] 201. Electric actuator; 202. Guide tube; 203. Top block; 204. Electromagnetic switch; 205. Arc plate; 206. Drive rod; 207. Drive cylinder; 208. Guide block; 209. Driven gear; 210. Driven gear ring; 211. Rack;

[0031] 301. Backflow cover; 302. Center cylinder; 303. Stirring plate; 304. Drive cylinder; 305. Input pipe; 306. Electromagnetic coil; 307. Drive ring; 308. Passive impeller; 309. Traction line; 310. Resistance plug; 311. Guide cylinder; 312. Center cylinder. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1: Please refer to Figures 1-3 A clamp for assembling lithium batteries includes a gripper arm 1, with two grippers 2 mounted on the bottom end of the gripper arm 1. A support plate 3 is fixedly mounted on the bottom end of the grippers 2 by bolts. The gripper arm 1 is provided with a drive device for driving the grippers 2 to open and close. The drive device is used to adjust the distance between the two support plates 3 to accommodate batteries of different thicknesses. The drive device adopts an existing mature mechanical transmission or electric drive structure. Its specific structure and working principle are conventional technologies in this field and will not be described in detail here.

[0034] Both support plates 3 have detachable sealing caps 101 installed on the sides that are far apart from each other, and both sides that are close to each other have isolation membranes 102 installed. A baffle 103 is fixedly installed on the inner end of the isolation membrane 102. Multiple support cylinders 105 are fixedly installed on the surface of the baffle 103. The multiple support cylinders 105 are arranged in a rectangular array to improve the overall uniformity of force. A ball cap 106 is fixedly installed on the end of the support cylinder 105 that is close to the isolation membrane 102. The isolation membrane 102 is made of soft rubber and its inner surface is in contact with the ball cap 106.

[0035] like Figures 2-5 The space between the ball cap 106 and the support cylinder 105 is filled with magnetic powder and mixed with low-viscosity lubricating oil. The lubricating oil is used to enhance the fluidity of the magnetic powder and improve the deformation response speed of the ball cap 106 under pressure, making the overall contact interface more flexible.

[0036] An isolation plate 104 is fixedly installed inside the baffle 103. The isolation plate 104 is fixedly connected to the back of the ball cover 106 to limit the relative position between adjacent ball covers 106, so as to avoid excessive deformation and mutual interference after being pressed, thereby improving the clamping stability and pressure distribution uniformity. The ball cover 106 is made of soft silicone. When the gripper arm 1 clamps the battery pack, the separator 102 first contacts the outer surface of the battery. Since the separator 102 is tightly attached to the ball cover 106, when the support plate 3 clamps inward, the ball cover 106 is compressed under the action of external force, and the gap between the internal magnetic powder is reduced, thereby forming a flexible contact interface. Through the flow and redistribution of magnetic powder, the clamping force can be effectively buffered, avoiding hard contact from causing indentation, structural deformation or internal interlayer misalignment to the battery shell, ensuring the safety and structural integrity of the battery pack during the clamping process.

[0037] like Figures 3-5 A movable cylinder 111 is provided on the side of the support cylinder 105 away from the isolation membrane 102. A limiting plate 108 is fixedly sleeved on the surface of the movable cylinder 111. The limiting plate 108 and the baffle 103 are connected by a return spring 109 so that the movable cylinder 111 can automatically return to its original position after being subjected to force. Multiple drive rods 206 are rotatably installed on the inner end of the sealing cover 101. Each drive rod 206 corresponds to multiple support cylinders 105 arranged in an array. Multiple top blocks 203 are sleeved on the surface of the drive rods 206. The surface of the top blocks 203 is in contact with the surface of the movable cylinder 111.

[0038] Among them, the top block 203 adopts an eccentric structure (such as...) Figure 3 As shown, when the drive rod 206 rotates, the contact position of the eccentric top block 203 relative to the movable cylinder 111 changes, thereby pushing the movable cylinder 111 to move closer to the support cylinder 105.

[0039] An electromagnetic switch 204 is fixedly installed on the inner end of the sealing cover 101. A drive cylinder 207 is sleeved on the surface of the drive rod 206. A driven gear 209 is fixedly installed on the side of the top block 203 near the drive cylinder 207. The telescopic end of the electromagnetic switch 204 is rotatably connected to the drive cylinder 207. The inner wall of the drive cylinder 207 is provided with a toothed groove structure that meshes with the driven gear 209.

[0040] The telescopic end of the electromagnetic switch 204 drives the drive cylinder 207 to move axially along the drive rod 206. A guide block 208 is fixedly installed on the outer surface of the drive rod 206. A rectangular guide groove adapted to the guide block 208 is formed inside the drive cylinder 207. The guide block 208 passes through the guide groove to limit the rotational freedom of the drive cylinder 207 and ensure that it can rotate synchronously with the drive rod 206.

[0041] Example 2: Please refer to Figures 5-7A lithium battery assembly fixture, based on Embodiment 1, has a central cylinder 302 inserted inside a support cylinder 105, which is rotatably connected to a movable cylinder 111. A drive cylinder 304 is fixedly installed at the inner end of the support cylinder 105, and the drive cylinder 304 is sleeved on the outside of the central cylinder 302. An electromagnetic coil 306 is fixedly installed at the inner end of the drive cylinder 304. A stirring plate 303 is fixedly installed at the end of the central cylinder 302 away from the drive cylinder 304. The stirring plate 303 is made of metal. When the electromagnetic coil 306 is energized to generate a magnetic field, the stirring plate 303 generates a magnetic response under the action of electromagnetic induction, thereby causing the magnetic powder inside the support cylinder 105 to be adsorbed on the surface of the stirring plate 303 and the drive cylinder 304.

[0042] Furthermore, the surface of the stirring plate 303 is provided with multiple notches to form a turbulence structure. When the central cylinder 302 and the stirring plate 303 rotate under the driving action, the notches can stir the magnetic powder inside the support cylinder 105, so as to keep the magnetic powder in a flowing state and prevent the magnetic powder from being deposited at the bottom of the support cylinder 105 under the action of gravity, thereby ensuring that the magnetic powder is evenly distributed and improving the buffering performance of the ball cover 106 when it is squeezed.

[0043] A central tube 312 is inserted inside the central tube 302. A passive impeller 308 is fixedly installed at the inner end of the central tube 302 and is sleeved on the outer wall of the central tube 312. A guide tube 311 is inserted at the inner end of the central tube 312 and a resistance plug 310 is inserted at the inner end of the guide tube 311. The outer peripheral edge of the resistance plug 310 is in close contact with the inner wall of the central tube 312. Multiple traction lines 309 are fixedly installed on the inner wall of the ball cover 106. The traction lines 309 are arranged in a ring and the free end of each traction line 309 is fixedly connected to the outer surface of the resistance plug 310.

[0044] Under the further action of the structure, when the guide cylinder 311 moves away from the drive ring 307, the resistance plug 310 moves synchronously with the guide cylinder 311 under the negative pressure formed inside, so that the traction line 309 is in a taut state. When the ball cover 106 is squeezed and deformed during the clamping of the battery, the traction line 309 will become locally loose with the deformation of the ball cover 106. However, under the continuous negative pressure formed by the resistance plug 310 and the guide cylinder 311, the traction line 309 will be tightened again.

[0045] like Figure 2 , Figure 5 , Figure 6A backflow cover 301 is fixedly installed at the inner end of the movable cylinder 111. The backflow cover 301 is connected to the central cylinder 302. An input pipe 305 is fixedly connected to the surface of the backflow cover 301. A return pipe 107 is fixedly connected to the surface of the support cylinder 105. Two guide pipes 202 are fixedly installed at the inner end of the sealing cover 101 by a clamp. One guide pipe 202 is connected to the input pipe 305, and the other is connected to the return pipe 107. Specifically, a circulation pump is installed inside the grab arm 1. The ends of the two guide pipes 202 are connected to the input end and the output end of the circulation pump, respectively. The circulation pump is a mature technology. Its specific structure and working principle are conventional technologies in this field and will not be described in detail here. When the circulation pump is working, the magnetic powder inside the support cylinder 105 is in a flowing state.

[0046] like Figure 3 , Figure 4 , Figures 7-9 A pull rod 110 is inserted inside the central tube 312. The pull rod 110 is fixedly connected to the guide cylinder 311. The end of the pull rod 110 away from the guide cylinder 311 is exposed on the outside of the movable cylinder 111. An arc plate 205 is fixedly installed on the inner end of the top block 203. A protruding rod is fixedly installed on the end of the pull rod 110, and the protruding rod rests on the surface of the arc plate 205 (e.g., ...). Figure 9 As shown, an electric actuator 201 is fixedly installed on the inner end of the sealing cover 101 by bolts, and a rack 211 is slidably installed on the inner end of the sealing cover 101. The rack 211 is fixedly connected to the telescopic end of the electric actuator 201. A passive gear ring 210 is fixedly sleeved on the surface of the drive cylinder 207 near the rack 211, and the rack 211 meshes with the passive gear ring 210.

[0047] The working principle of this invention is:

[0048] During operation, the gripper 2 retracts and drives the support plate 3 to move closer to each other, thereby clamping the battery pack. After the support plate 3 clamps inward, the outer surface of the separator 102 contacts the outer surface of the battery. The ball cover 106 is compressed under the action of external force, and the gap of the magnetic powder inside it decreases accordingly, thereby forming a flexible buffer contact interface to avoid structural damage to the battery caused by hard compression.

[0049] Subsequently, the telescopic end of the electric actuator 201 drives the rack 211 to move linearly. Under the meshing action of the rack 211 and the driven gear ring 210, the drive cylinder 207 begins to rotate. The drive rod 206 also rotates synchronously under the drive of the drive cylinder 207, and further drives the other drive cylinders 207 arranged coaxially to rotate, so that the driven gear 209 can rotate under the action of driving force.

[0050] During the rotation of the drive rod 206, the eccentric top block 203 rotates accordingly, pushing the movable cylinder 111 to move closer to the support cylinder 105. The displacement of the movable cylinder 111 causes the central cylinder 302 to move synchronously, so that the stirring plate 303 gradually approaches the ball cover 106, thereby gradually reducing the gap of the magnetic powder inside the ball cover 106 and increasing the overall rigidity of the ball cover 106 to meet the clamping requirements of the battery under different working conditions.

[0051] As the eccentric top block 203 rotates, it also drives the arc plate 205 to swing. The swing of the arc plate 205 pulls the pull rod 110 to move axially. The movement of the pull rod 110 further pushes the guide cylinder 311 to move outward. Under the action of internal negative pressure, the resistance plug 310 will move synchronously with the guide cylinder 311, so that the traction line 309 is in a taut state.

[0052] When the battery cell expands in volume while it is clamped (especially during the formation and capacity testing stages), the battery will exert a reaction force towards the sealing cap 101, causing the shape of the ball cap 106 to undergo local deformation. At this time, the traction wire 309 will loosen due to the deformation of the ball cap 106. However, due to the negative pressure maintained between the resistance plug 310 and the guide cylinder 311, the traction wire 309 will be tightened again, so that the ball cap 106 can still maintain a controlled deformation after deformation, avoiding structural damage caused by excessive expansion.

[0053] During the movement of the guide cylinder 311, although the resistance plug 310 will move under the negative pressure, the ball cover 106 is gradually pressed under the push of the stirring plate 303, so that the resistance plug 310 is relatively pulled, thereby forming a gap between the resistance plug 310 and the guide cylinder 311. This gap serves as the deformable margin for battery expansion. The movement stroke of the guide cylinder 311 is determined by the rotation angle of the eccentric top block 203, so the expansion compensation amount can be adjusted according to the set clamping strength.

[0054] In addition, the support cylinders 105 are arranged in a rectangular array, and the electromagnetic switch 204 corresponding to each support cylinder 105 can be controlled independently. During the rotation of the drive rod 206, each electromagnetic switch 204 can independently control the engagement and disengagement of the drive cylinder 207 and the driven gear 209, so that the drive cylinder 207 selects or disconnects the driven gear 209 after the drive rod 206 rotates at an appropriate angle, thereby controlling the displacement of the stirring plate 303 in zones to adapt to the limitation requirements of the expansion area at different battery cell process stages.

[0055] Before the device is in operation, the magnetic powder in the support cylinder 105 is deposited at the bottom under the action of gravity. After the circulation pump is started, it drives the internal hydraulic oil to flow. The magnetic powder is carried into the interior of the central cylinder 302 along with the hydraulic oil circulation. During the flow, it drives the passive impeller 308 to rotate, thereby driving the central cylinder 302 to rotate, which in turn drives the stirring plate 303 to rotate. The notch on the outer surface of the stirring plate 303 can continuously stir the magnetic powder inside the support cylinder 105, so that the magnetic powder is kept in a uniformly dispersed state, avoiding deposition, improving the force consistency and buffering performance of the ball cover 106. At the same time, when the electromagnetic coil 306 is energized, it can maintain the current aggregation state of the magnetic powder.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A clamp for assembling lithium batteries, comprising a gripper arm (1), characterized in that: Two grippers (2) are installed at the bottom end of the gripper (1). A support plate (3) is fixedly installed at the bottom end of the gripper (2). A sealing cover (101) can be detachably installed on the side of the two support plates (3) that are far apart from each other. An isolation membrane (102) is installed on the two sides that are close to each other. A baffle (103) is fixedly installed on the inner end of the isolation membrane (102). Multiple support cylinders (105) are fixedly installed on the surface of the baffle (103). The multiple support cylinders (105) are arranged in a rectangular array. A ball cap (106) is fixedly installed on the end of the support cylinder (105) that is close to the isolation membrane (102). Magnetic powder is filled between the ball cap (106) and the support cylinder (105). A central cylinder (302) is inserted inside the support cylinder (105). An isolation plate (104) is fixedly installed inside the baffle (103). The isolation plate (104) is fixedly connected to the back of the ball cover (106) to limit the relative position between adjacent ball covers (106) and prevent them from interfering with each other due to excessive deformation after being pressed, thereby improving the clamping stability and pressure distribution uniformity. The ball cover (106) is made of soft silicone. When the gripper (1) clamps the battery pack, the separator (102) first contacts the outer surface of the battery. Since the separator (102) is tightly attached to the ball cover (106), when the support plate (3) clamps inward, the ball cover (106) is compressed under the action of external force, and the gap between the internal magnetic powder is reduced, thereby forming a flexible contact interface. Through the flow and redistribution of magnetic powder, the clamping force can be effectively buffered to avoid hard contact causing indentation, structural deformation or internal interlayer misalignment to the battery shell, and to ensure the safety and structural integrity of the battery pack during the clamping process. A movable cylinder (111) is provided on the side of the support cylinder (105) away from the isolation membrane (102). Multiple drive rods (206) are rotatably installed on the inner end of the sealing cover (101). Each drive rod (206) corresponds to multiple support cylinders (105) arranged in an array. Multiple top blocks (203) are sleeved on the surface of the drive rod (206). The surface of the top block (203) is in contact with the surface of the movable cylinder (111). The top block (203) adopts an eccentric structure. When the drive rod (206) rotates, the contact position of the eccentric top block (203) relative to the movable cylinder (111) changes, thereby pushing the movable cylinder (111) to move closer to the support cylinder (105). An electromagnetic switch (204) is fixedly installed on the inner end of the sealing cover (101). A drive cylinder (207) is sleeved on the surface of the drive rod (206). A passive gear (209) is fixedly installed on the side of the top block (203) near the drive cylinder (207). The telescopic end of the electromagnetic switch (204) is rotatably connected to the drive cylinder (207). The inner wall of the drive cylinder (207) is provided with a toothed groove structure that meshes with the passive gear (209). The telescopic end of the electromagnetic switch (204) drives the drive cylinder (207) to move axially along the drive rod (206). A guide block (208) is fixedly installed on the outer surface of the drive rod (206). A rectangular guide groove that matches the guide block (208) is formed inside the drive cylinder (207). The guide block (208) passes through the guide groove to limit the rotational freedom of the drive cylinder (207) and ensure that it can rotate synchronously with the drive rod (206). The central cylinder (302) is rotatably connected to the movable cylinder (111). A drive cylinder (304) is fixedly installed at the inner end of the support cylinder (105). The drive cylinder (304) is sleeved on the outside of the central cylinder (302). An electromagnetic coil (306) is fixedly installed at the inner end of the drive cylinder (304). A stirring plate (303) is fixedly installed at the end of the central cylinder (302) away from the drive cylinder (304). The stirring plate (303) is made of metal. When the electromagnetic coil (306) is energized and generates a magnetic field, the stirring plate (303) generates a magnetic field under the action of electromagnetic induction. The magnetic response causes the magnetic powder inside the support cylinder (105) to be adsorbed onto the surface of the stirring plate (303) and the drive cylinder (304). The surface of the stirring plate (303) has multiple notches to form a turbulence structure. When the central cylinder (302) and the stirring plate (303) rotate under the driving action, the notches can stir the magnetic powder inside the support cylinder (105), causing the magnetic powder to remain in a flowing state and preventing the magnetic powder from being deposited at the bottom of the support cylinder (105) under the action of gravity, thereby ensuring that the magnetic powder is evenly distributed and improving the cushioning performance of the ball cover (106) when it is squeezed.

2. The lithium battery assembly fixture according to claim 1, characterized in that: A passive impeller (308) is fixedly installed at the inner end of the central tube (302), and the passive impeller (308) is sleeved on the outer wall of the central tube (312). A guide tube (311) passes through the inner end of the central tube (312).

3. The lithium battery assembly fixture according to claim 2, characterized in that: The inner end of the guide tube (311) is provided with a resistance plug (310), and the outer peripheral edge of the resistance plug (310) is in close contact with the inner wall of the central tube (312). Multiple traction lines (309) are fixedly installed on the inner wall of the ball cover (106). The traction lines (309) are arranged in a ring shape, and the free end of each traction line (309) is fixedly connected to the outer surface of the resistance plug (310).

4. A lithium battery assembly fixture according to claim 1, characterized in that: A central tube (312) is inserted inside the central cylinder (302). A backflow cover (301) is fixedly installed at the inner end of the movable cylinder (111). The backflow cover (301) is connected to the central cylinder (302). An input pipe (305) is fixedly connected to the surface of the backflow cover (301). A return pipe (107) is fixedly connected to the surface of the support cylinder (105).

5. A lithium battery assembly fixture according to claim 4, characterized in that: The inner end of the sealing cap (101) is fixedly installed with two guide pipes (202), one of which is connected to the input pipe (305), and the other is connected to the return pipe (107).

6. A lithium battery assembly fixture according to claim 5, characterized in that: A pull rod (110) is inserted inside the central tube (312). The pull rod (110) is fixedly connected to the guide cylinder (311). The end of the pull rod (110) away from the guide cylinder (311) is exposed on the outside of the movable cylinder (111). An arc plate (205) is fixedly installed on the inner end of the top block (203). A protruding rod is fixedly installed on the end of the pull rod (110), and the protruding rod rests on the surface of the arc plate (205).

Images