A full tab cylindrical lithium battery tab rubbing device

Abstract

The application belongs to the technical field of lithium battery manufacturing, and discloses a full-tab cylindrical lithium battery tab rubbing device, which comprises a lithium battery. The rubbing assembly and the motor are cooperated to guide the outward movement of the steel balls due to the centrifugal tendency generated by the rotation of the protective box, and finally all the steel balls roll on the side of the rubber pad. The metal column on the metal plate is pulled by the nylon rope to resist the side of the rubber pad. The noise generated by the rolling of the steel balls is weakened by the rubber pad. The side part of the protective box is located in the rubber pad. The pressure applied by the steel balls is uniformly transmitted to the rubber pad through the hard material on the side of the protective box. The part of the steel balls that cannot apply pressure is replaced by the metal column on the metal plate. At the same time, the rolling process of the steel balls avoids causing grooves on the tab end. The rotating part of the protective box does not directly resist the tab end through the separation of the rubber pad, thereby avoiding hard contact and causing the falling metal debris on the tab due to friction.

Description

Technical Field

[0001] This invention belongs to the field of lithium battery manufacturing technology, specifically a device for flattening the tabs of a cylindrical lithium battery with full tabs. Background Technology

[0002] A full-tab cylindrical lithium battery is a type of lithium-ion battery that improves performance by optimizing the tab structure. It can effectively reduce internal resistance, reduce heat generation, and improve charge and discharge rates and cycle life, making it particularly suitable for high-power applications. The tabs are the key conductive structures in a lithium battery that connect the active electrode materials, namely the positive and negative electrodes, so that they can be connected to external circuits. They are usually made of metal foil. To ensure the stability and consistency of subsequent welding, the tabs need to be flattened at the end to ensure their flatness.

[0003] In existing technologies, specialized flattening equipment is typically used to apply vertical pressure evenly to both ends of the tab and rotate it. However, when the flattening structure is in direct contact with the tab and rotates, metal debris is very likely to be generated and remain in the tab. This reduces the integrity of the flattened tab, which in turn reduces the quality of subsequent welding and energy storage processes. The metal debris may also cause the battery to bulge, overheat abnormally, or even explode, affecting its safety. Therefore, there is a need to provide a flattening device for the tabs of a cylindrical lithium battery with full tabs. Summary of the Invention

[0004] To address the problems mentioned in the background art, the present invention provides a flattening device for cylindrical lithium battery tabs with full tabs, which solves the problem that when the flattening structure is in direct contact with and rotates the tab part, metal debris is likely to be generated and remain in the tab, leading to dangerous situations later.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a flattening device for the tabs of a cylindrical lithium battery with all tabs, including a lithium battery; a base and a bracket mounted on the base; a motor mounted on the bracket, the output shaft of which is driven by a cross shaft; support components slidably mounted on both ends of the top of the base; a protective component mounted on the bracket; the protective component includes a dual-axis hydraulic rod fixed on the bracket, the two ends of which are respectively hinged to the support component via two push plates; a flattening component rotatably mounted on each support component; the flattening component includes a protective box rotatably mounted on the support component, a rubber pad rotatably mounted on the side of the protective box, the side of the protective box and the rubber pad being adapted to the interior of the lithium battery, a metal plate connected to the interior of the protective box via a tension spring, a group of steel balls being connected in series on the side of the metal plate via several nylon ropes distributed at equal angles in a circumferential direction, a metal column for abutting the center of the rubber pad being installed in the middle of the side of the protective box; the output shaft of the motor drives the protective box to rotate via the cross shaft and the support components; and a conversion component mounted on each support component.

[0006] Preferably, there is a gap between the side of the metal plate and the inside of the protective box, and the inside of the protective box is filled with lubricating oil with a volume of one-fifth of the internal capacity of the protective box, and the lubricating oil is soaked into the outer periphery of each steel ball.

[0007] Preferably, each pair of adjacent steel balls is staggered, and the inner wall of the protective box is provided with a guide groove for the rolling of the steel balls. The guide groove is divided into an axial groove and a radial groove. The steel balls are initially located inside the axial groove.

[0008] Preferably, the support assembly includes a second bracket that is slidably mounted on the top of the base. A transmission shaft sleeved on the outer periphery of the cross shaft is rotatably mounted inside the second bracket. The protective box is rotatably mounted on the second bracket. The transmission shaft is connected to the protective box via a belt. The two movable ends of the dual-axis hydraulic rod are respectively hinged to the second bracket via a push plate.

[0009] Preferably, the protective assembly further includes a protective plate and a metal sheet. Each of the protective plates has a magnet installed at both ends. Two adjacent protective plates are attracted to each other by the magnet and form a group. The protective plate and the metal sheet form a circle and cover the outer periphery of the lithium battery. The protective plate is movably snapped onto the top of the bracket. Two magnets are provided on both sides of the bracket, and their positions are adapted to the magnets.

[0010] Preferably, the protective assembly further includes a spring telescopic rod that is hinged to the two movable ends of the dual-axis hydraulic rod. The middle part of the spring telescopic rod is hinged and slides on the bracket. A support rod is installed at the top of the spring telescopic rod. A magnet is installed at the bottom of each end of the support rod. The positions of the magnet and the magnet are matched. The movable end of the spring telescopic rod is movably engaged with the protective plate.

[0011] Preferably, the outer periphery of the first magnet is covered with a rubber layer, the outer side of the first magnet extends through the rubber layer and is cylindrical, and the second and third magnets are both cylindrical.

[0012] Preferably, the conversion assembly includes a main shaft rotatably mounted on the bracket two, a set of metal blocks are mounted at equal angles around the outer circumference of the main shaft, and the main shaft is connected to the protective box via a belt two.

[0013] The protective assembly also includes a drive slot consisting of two adjacent magnets that are attracted together, the drive slot being adapted to the metal block, and the gap between each pair of protective plates being adapted to the metal block.

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

[0015] This invention utilizes a combination of a flattening component and a motor. The centrifugal force generated by the rotation of the protective box guides the steel balls outward, causing them to roll entirely onto the side of the rubber pad. A nylon rope pulls a metal column on a metal plate against the side of the rubber pad. The noise generated by the rolling steel balls is reduced by the rubber pad. The side of the protective box is located within the rubber pad, and the pressure applied by the steel balls is evenly transmitted to the rubber pad through the rigid material on the side of the protective box. The portion where the steel balls cannot apply pressure is replaced by the metal column on the metal plate. This design also prevents the steel balls from creating grooves at the tip of the electrode during rolling. The rubber pad prevents the rotating part of the protective box from directly contacting the tip, thus avoiding hard contact and preventing metal debris from falling off the tip due to friction.

[0016] This invention, through the coordination of protective components and lithium battery structures, allows the retraction of the dual-axis hydraulic rod's telescopic end. The top of the spring telescopic rod forcibly separates the two protective plates at that point. The other protective plates and metal sheets remain connected by magnet one, and when magnet one and magnet two attract each other, they do not force the spring telescopic rod to separate the two protective plates, preventing them from detaching from the spring telescopic rod and thus causing the device to malfunction. This greatly improves the automation of the device, reduces the time and labor required for manually fixing and removing the lithium battery, and thus improves the stability of the device's operation.

[0017] This invention, through the cooperation of structures such as conversion components and protective components, allows the protective box to rotate when the main shaft is driven by the second belt. The rotation direction of the main shaft is the same as that of the protective box. The main shaft also uses metal blocks on it to sequentially engage with the grooves formed between the drive groove and the magnets on each pair of protective plates connected by metal sheets. Therefore, the circle composed of several protective plates and metal sheets is driven to rotate in the opposite direction to the rotation direction of the protective box, thereby further accelerating the flattening of the tabs and improving the working efficiency of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the fit between the motor and the support assembly structure of the present invention;

[0020] Figure 3 This is an exploded view of the cross shaft and support assembly structure of the present invention.

[0021] Figure 4 This is a schematic diagram of the internal structure of the protective box of the present invention;

[0022] Figure 5 This is an exploded view of the disassembled structure of the kneading component of the present invention;

[0023] Figure 6 This is a schematic diagram showing the structural cooperation between the bracket and the protective component of the present invention;

[0024] Figure 7 This is an exploded view of the disassembled structure of the protective component of the present invention;

[0025] Figure 8 This is a schematic diagram showing the structural cooperation between the conversion component and the protection component of the present invention.

[0026] In the diagram: 1. Base; 2. Bracket 1; 3. Motor; 31. Cross shaft; 4. Support assembly; 41. Bracket 2; 42. Drive shaft; 43. Belt 1; 5. Conversion assembly; 51. Main shaft; 52. Belt 2; 53. Metal block; 6. Protective assembly; 61. Dual-axis hydraulic rod; 62. Push guide plate; 63. Spring telescopic rod; 64. Support rod; 65. Protective plate; 66. Metal sheet; 67. Magnet 1; 68. Magnet 2; 69. Magnet 3; 60. Drive groove; 7. Smoothing assembly; 71. Protective box; 72. Rubber pad; 73. Tension spring; 74. Metal plate; 75. Nylon rope; 76. Steel ball; 77. Guide groove; 8. Lithium battery. Detailed Implementation

[0027] 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.

[0028] like Figures 1 to 8 As shown, the present invention provides a device for flattening the tabs of a cylindrical lithium battery with multiple tabs, including a lithium battery 8;

[0029] It also includes a base 1 and a bracket 2 mounted on the base 1;

[0030] The motor 3 is mounted on the bracket 2, and the output shaft of the motor 3 is driven by a cross shaft 31.

[0031] Support components 4 are slidably installed at both ends of the top of the base 1;

[0032] Protective component 6 is installed on bracket 12;

[0033] The protective component 6 includes a dual-axis hydraulic rod 61 fixed on the bracket 2. The two ends of the dual-axis hydraulic rod 61 are respectively hinged to the support component 4 through two push plates 62.

[0034] Rotate the kneading component 7 installed on each support component 4;

[0035] The kneading component 7 includes a protective box 71 rotatably mounted on the support component 4. A rubber pad 72 is rotatably mounted on the side of the protective box 71. The side of the protective box 71 and the rubber pad 72 are adapted to the inside of the lithium battery 8. A metal plate 74 is connected to the inside of the protective box 71 by a tension spring 73. A group of steel balls 76 are connected in series on the side of the metal plate 74 by a number of nylon ropes 75 distributed at equal angles in a ring. A metal column for abutting the center of the rubber pad 72 is installed in the middle of the side of the protective box 71.

[0036] The output shaft of motor 3 drives the protective box 71 to rotate via cross shaft 31 and support assembly 4;

[0037] The conversion component 5 is installed on each support component 4.

[0038] The above solution is adopted: In the working state, the lithium battery 8 is located inside the protective component 6 and the two end tabs are exposed;

[0039] The motor 3 forces the cross shaft 31 and the support assembly 4 to drive the protective box 71 to rotate.

[0040] Since the side of the rubber pad 72 is attached to the tab portion and does not rotate, the centrifugal force generated by the rotation of the protective box 71 guides the steel ball 76 to move outward. Since each group of steel balls 76 is restricted by the nylon rope 75, the steel balls 76 will not appear disorderly afterward. The steel balls 76 eventually roll evenly on the surface of the rubber pad 72 located inside the protective box 71. The steel balls 76 also pull the metal pillars on the metal plate 74 through the nylon rope 75 to resist and apply pressure to the side of the rubber pad 72. Since the rubber pad 72 is made of flexible material and is attached to the side of the protective box 71, the noise generated by the rolling of the steel balls 76 is reduced. The side portion of the protective box 71 is located inside the rubber pad 72. The pressure applied by the steel ball 76 can be evenly transmitted to the rubber pad 72 through the rigid material on the side of the protective box 71, and then transmitted to the tab portion of the lithium battery 8 by the rubber pad 72. The part where the steel ball 76 cannot apply pressure is replaced by the metal pillars on the metal plate 74.

[0041] This allows the steel ball 76 and the metal column to apply pressure evenly to the rubber pad 72, and also prevents the steel ball 76 from creating grooves at the end of the electrode tab during rolling. With the rubber pad 72 acting as a barrier, the rotating part of the protective box 71 does not directly contact the end of the electrode tab, thus avoiding hard contact and preventing metal fragments from falling off the electrode tab due to friction.

[0042] When the device stops working, the tension spring 73 pulls several steel balls 76 back to their initial position through the metal plate 74 and the nylon rope 75, and they are no longer laid flat on the rubber pad 72. This prevents the steel balls 76 from being loose when the device is not working, which would result in uneven pressure when the device is working again and indirectly cause a decrease in the kneading quality.

[0043] At the same time, the two ends of the dual-axis hydraulic rod 61 can be controlled to retract, and the support assembly 4 and the flattening assembly 7 can be pushed away from the lithium battery 8 through the pusher plate 62, so that the workers or the robot in the factory can take out the lithium battery 8.

[0044] like Figures 2-5 As shown, there is a gap between the side of the metal plate 74 and the inside of the protective box 71. The inside of the protective box 71 is filled with lubricating oil with a volume of one-fifth of the internal capacity of the protective box 71. The lubricating oil is soaked into the outer periphery of each steel ball 76.

[0045] The above scheme is adopted: when the metal plate 74 moves, the air inside the protective box 71 flows through the gap between the protective box 71 and the metal plate 74, so that the metal plate 74 will not be difficult to move due to air pressure. After the protective box 71 starts to rotate, the centrifugal force it generates can more quickly force the steel ball 76 to be laid flat on the side of the rubber pad 72 and enter the working state, which at the same time improves the working efficiency of the device.

[0046] When the steel balls 76 are rolled on the side of the rubber pad 72, the lubricating oil covering their outer periphery prevents excessive wear caused by the collision or rolling between the steel balls 76. When several steel balls 76 are piled up together and rub against each other, the lubricating oil can also prevent static electricity from being generated inside the protective box 71, which would affect the subsequent performance of the lithium battery 8.

[0047] like Figures 2-5 As shown, each pair of adjacent steel balls 76 are staggered. The inner wall of the protective box 71 is provided with a guide groove 77 for the rolling of the steel balls 76. The guide groove 77 is divided into an axial groove and a radial groove. The steel balls 76 are located inside the axial groove in the initial state.

[0048] The above scheme is adopted: when the centrifugal force compels the steel ball 76 to move, such as Figure 5 The guide groove 77 inside the protective box 71 shown can effectively guide the steel balls 76 to be evenly laid out and rolled on the side of the rubber pad 72. Each group of steel balls 76 is staggered, that is, the gap between every two axially arranged steel balls 76 is filled by the circumferentially arranged steel balls 76. This makes the pressure generated when several steel balls 76 work together and roll on the rubber pad 72 more uniform, further improving the quality of flattening the tab.

[0049] like Figures 1-3 As shown, the support assembly 4 includes a bracket 41 that is slidably mounted on the top of the base 1. A transmission shaft 42 that is sleeved on the outer periphery of the cross shaft 31 is rotatably mounted inside the bracket 41. The protective box 71 is rotatably mounted on the bracket 41. The transmission shaft 42 is connected to the protective box 71 via a belt 43. The two movable ends of the dual-axis hydraulic rod 61 are respectively hinged to the bracket 41 via a pusher plate 62.

[0050] Using the above scheme: When the device finishes its work, the dual-axis hydraulic rod 61 is controlled to retract, so that it pushes the bracket 41 to slide on the base 1 through the push plate 62. At this time, the flattening component 7 can be separated from the lithium battery 8, which makes it easier for workers or robotic arms to grab the lithium battery 8. No manual intervention is required throughout the process, which greatly improves the automation and convenience of the device.

[0051] Since the cross shaft 31 is not cylindrical, it is also movably connected to the transmission shaft 42. This allows the output shaft of the motor 3 to still drive the transmission shaft 42 to rotate through the cross shaft 31 when the bracket 2 41 and the transmission shaft 42 move together. Then, the transmission shaft 42 drives the protective box 71 to rotate and enter the working state through the belt 1 43. This further improves the smoothness of the device's operation.

[0052] like Figures 1-8As shown, the protective component 6 also includes a protective plate 65 and a metal sheet 66. Each protective plate 65 has a magnet 67 installed at both ends. Every two adjacent protective plates 65 are attracted to each other by the magnet 67 and form a group. The protective plate 65 and the metal sheet 66 form a circle and cover the outer periphery of the lithium battery 8. The protective plate 65 is movably snapped onto the top of the bracket 2. Two magnets 69 are provided on both sides of the bracket 2, and their positions are adapted to the magnets 67.

[0053] The protective assembly 6 also includes a spring telescopic rod 63 that is hinged to the two movable ends of the dual-axis hydraulic rod 61. The middle part of the spring telescopic rod 63 is hinged and slides on the bracket 2. A support rod 64 is installed at the top of the spring telescopic rod 63. A magnet 68 is installed at the bottom of each end of the support rod 64. The positions of the magnet 68 and the magnet 67 are matched. The movable end of the spring telescopic rod 63 is movably engaged with the protective plate 65.

[0054] Using the above scheme: when the device is stationary, magnet 68 attracts magnet 67 and magnet 69 attracts magnet 69, so that when the protective plate 65 and metal sheet 66 are stationary, two adjacent protective plates 65 that are attracted together by magnet 67 are respectively engaged with two spring telescopic rods 63.

[0055] When the telescopic end of the dual-axis hydraulic rod 61 retracts, since the middle part of the spring telescopic rod 63 is still hinged to the bracket 2, the top of the spring telescopic rod 63 can move away from the initial position and forcibly force the two protective plates 65 to separate. Since there are two more protective plates 65 hinged to the bracket 2, the other protective plates 65 and the metal plate 66 will still attract each other and be connected together through the magnet 67. When the two magnets 67 and 68 attract each other, they will not force the spring telescopic rod 63 to pull the two protective plates 65 apart. After they separate from the spring telescopic rod 63, the state cannot work normally.

[0056] This greatly improves the automation of the device, reduces the time and labor required for manual fixing and removal of the lithium battery 8. Even when the robotic arm picks up the lithium battery 8 and places it on each set of protective plates 65 and metal sheets 66, the dual-axis hydraulic rod 61 extends and pushes the spring telescopic rod 63 to move the two protective plates 65 on it. After they are re-attached by the magnet 67, the array of protective plates 65 and metal sheets 66 merge into a complete circle, which can further limit the position of the lithium battery 8, so that the protective box 71 can accurately enter the interior of the lithium battery 8, thereby improving the stability of the device operation.

[0057] like Figures 1-8 As shown, magnet 67 is covered with a rubber layer on its outer periphery, and the outer side of magnet 67 extends through the rubber layer and is cylindrical. Magnets 68 and 69 are also cylindrical.

[0058] The above solution ensures that the rubber layer allows magnet 67 to have magnetic force while preventing the two magnets 67 from attracting each other and colliding, thus preventing breakage. The cylindrical part extending from the outside of magnet 67 can also ensure that it can attract magnet 69 or magnet 68 well, so as not to affect subsequent work.

[0059] like Figures 1-8 As shown, the conversion assembly 5 includes a main shaft 51 rotatably mounted on the bracket 41. A set of metal blocks 53 are mounted at equal angles around the outer periphery of the main shaft 51. The main shaft 51 is connected to the protective box 71 via a belt 52.

[0060] The protective component 6 also includes a drive groove 60 consisting of two adjacent magnets 67 that are attracted together. The drive groove 60 is adapted to the metal block 53, and the gap between each pair of protective plates 65 is adapted to the metal block 53.

[0061] Using the above scheme: When the protective box 71 drives the main shaft 51 to rotate via the belt 2 52, the rotation direction of the main shaft 51 is the same as that of the protective box 71. The main shaft 51 will also engage with the drive groove 60 and the gap between each pair of protective plates 65 via the metal blocks 53 on it. So at this time, the circle formed by several protective plates 65 and metal pieces 66 is driven to rotate, and the rotation direction is opposite to that of the protective box 71. This can further speed up the flattening of the electrode tabs and improve the working efficiency of the device.

[0062] The groove formed between the magnets 67 on each pair of protective plates 65 connected by metal sheets 66 and the outer side of the drive groove 60 are both open. Therefore, when the metal block 53 is separated from or comes into contact with the protective assembly 6 through the support assembly 4, it will not cause jamming or other issues. This makes the device's operation more stable and smooth.

[0063] The working principle and usage process of this invention are as follows: In the working state, the lithium battery 8 is located inside the protective assembly 6 with its two end tabs exposed; the motor 3 drives the protective box 71 to rotate via the cross shaft 31, the transmission shaft 42, and the belt 43; the centrifugal force generated by the rotation of the protective box 71 guides the steel balls 76 to move outward, eventually rolling entirely onto the surface of the rubber pad 72 located inside the protective box 71. The steel balls 76 also pull the metal pillars on the metal plate 74 against the side of the rubber pad 72 via the nylon rope 75. The side portion of the protective box 71 is located inside the rubber pad 72, and the pressure applied by the steel balls 76 can be evenly transmitted to the rubber pad 72 through the rigid material on the side of the protective box 71, and then transmitted from the rubber pad 72 to the end tabs of the lithium battery 8. The portion where the steel balls 76 cannot apply pressure is replaced by the metal pillars on the metal plate 74; this allows the steel balls 76 and the metal... The column evenly applies pressure to the tabs through the rubber pad 72; after completing the work, the two ends of the dual-axis hydraulic rod 61 retract and push the bracket 2 41 and the flattening component 7 away from the lithium battery 8 through the push plate 62; when the telescopic end of the dual-axis hydraulic rod 61 retracts, since the middle part of the spring telescopic rod 63 is still hinged to the bracket 1 2, the top of the spring telescopic rod 63 can move away from the initial position and forcibly force the two protective plates 65 to separate. Since there are two more protective plates 65 hinged on the bracket 1 2, the other protective plates 65 and the metal sheet 66 will still attract each other and be connected together through the magnet 1 67. When the two magnets 1 67 and magnet 2 68 attract each other, they will not force the spring telescopic rod 63 to pull the two protective plates 65 apart and detach them from the spring telescopic rod 63; the unflattened lithium battery 8 can be picked up and replaced by a robot or manually.

[0064] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0065] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for flattening the tabs of a cylindrical lithium battery with full tabs, comprising a lithium battery (8), characterized in that: It also includes a base (1) and a bracket (2) mounted on the base (1); A motor (3) is mounted on a bracket (2), and the output shaft of the motor (3) is driven by a cross shaft (31). Support components (4) are slidably installed at both ends of the top of the base (1); Protective component (6) is installed on bracket 1 (2); The protective component (6) includes a dual-axis hydraulic rod (61) fixed on the bracket (2), and the two ends of the dual-axis hydraulic rod (61) are respectively hinged to the support component (4) through two push plates (62); Rotate the kneading component (7) installed on each support component (4); The kneading component (7) includes a protective box (71) rotatably mounted on a support component (4). A rubber pad (72) is rotatably mounted on the side of the protective box (71). The side of the protective box (71) and the rubber pad (72) are adapted to the inside of the lithium battery (8). A metal plate (74) is connected inside the protective box (71) by a tension spring (73). A set of steel balls (76) are connected in series on the side of the metal plate (74) by a number of nylon ropes (75) distributed at equal angles in a ring. A metal column for abutting the center of the rubber pad (72) is installed in the middle of the side of the protective box (71). The output shaft of the motor (3) drives the protective box (71) to rotate via the cross shaft (31) and the support assembly (4); The conversion components (5) are installed on each support component (4); There is a gap between the side of the metal plate (74) and the inside of the protective box (71). The inside of the protective box (71) is filled with lubricating oil with a volume of one-fifth of the internal capacity of the protective box (71). The lubricating oil is soaked into the outer periphery of each steel ball (76). Each pair of adjacent steel balls (76) are staggered. The inner wall of the protective box (71) is provided with a guide groove (77) for the rolling of the steel balls (76). The guide groove (77) is divided into an axial groove and a radial groove. The steel balls (76) are located inside the axial groove in the initial state.

2. The full-tab cylindrical lithium battery tab flattening device according to claim 1, characterized in that: The support assembly (4) includes a bracket two (41) slidably mounted on the top of the base (1). The bracket two (41) has a drive shaft (42) rotatably mounted inside, which is sleeved on the outer periphery of the cross shaft (31). The protective box (71) is rotatably mounted on the bracket two (41). The drive shaft (42) is connected to the protective box (71) via a belt one (43). The two movable ends of the dual-axis hydraulic rod (61) are respectively hinged to the bracket two (41) via a pusher plate (62).

3. The full-tab cylindrical lithium battery tab flattening device according to claim 2, characterized in that: The protective component (6) also includes a protective plate (65) and a metal sheet (66). Each of the protective plates (65) has a magnet (67) installed at both ends. Each pair of adjacent protective plates (65) are attracted to each other by the magnet (67) and form a group. The protective plate (65) and the metal sheet (66) form a circle and cover the outer periphery of the lithium battery (8). The protective plate (65) is movably snapped onto the top of the bracket (2). Two magnets (69) are provided on both sides of the bracket (2) and their positions are adapted to the magnets (67).

4. The full-tab cylindrical lithium battery tab flattening device according to claim 3, characterized in that: The protective assembly (6) also includes a spring telescopic rod (63) that is hinged to the two movable ends of the dual-axis hydraulic rod (61). The middle part of the spring telescopic rod (63) is hinged and slides on the bracket (2). A support rod (64) is installed at the top of the spring telescopic rod (63). A magnet (68) is installed at the bottom of each end of the support rod (64). The positions of the magnet (68) and the magnet (67) are matched. The movable end of the spring telescopic rod (63) is movably engaged with the protective plate (65).

5. The full-tab cylindrical lithium battery tab flattening device according to claim 4, characterized in that: The outer periphery of the first magnet (67) is covered with a rubber layer, the outer side of the first magnet (67) extends through the rubber layer and is cylindrical, and the second magnet (68) and the third magnet (69) are both cylindrical.

6. The full-tab cylindrical lithium battery tab flattening device according to claim 5, characterized in that: The conversion assembly (5) includes a main shaft (51) rotatably mounted on a bracket (41). A set of metal blocks (53) are mounted at equal angles around the outer periphery of the main shaft (51). The main shaft (51) is connected to the protective box (71) via a belt (52). The protective assembly (6) also includes a drive groove (60) consisting of two adjacent magnets (67) that are attracted together, the drive groove (60) being adapted to the metal block (53), and the gap between each pair of protective plates (65) being adapted to the metal block (53).

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