Tab rubbing device for full-tab cylindrical lithium battery

Abstract

The invention 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. Through cooperation of structures such as the rubbing assembly and the motor, the centrifugal trend generated by rotation of the protection box guides the steel balls to move outwards, finally all the steel balls roll on the side face of the rubber pad, the nylon rope pulls the metal columns on the metal plate to abut against the side face of the rubber pad, and noise generated by rolling of the steel balls is weakened by the rubber pad; the side face part of the protection box is located in the rubber pad, pressure applied by the steel balls is evenly transmitted to the rubber pad through the hard materials on the side face of the protection box, the parts, which cannot apply pressure, of the steel balls are replaced by the metal columns on the metal plate, and meanwhile the situation that grooves are formed in the ends of the tabs in the rolling process of the steel balls is avoided. And the rotating part of the protection box does not directly abut against the end part of the tab, so that the falling of metal scraps on the tab caused by hard contact and friction is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of lithium battery manufacturing, and in particular is a device for flattening tabs of a full-tab cylindrical lithium battery. Background Art

[0002] A full-tab cylindrical lithium battery is a lithium-ion battery that improves performance by optimizing the tab structure. This effectively reduces internal resistance, reduces heat generation, and increases charge and discharge rates and cycle life. It is particularly suitable for high-power scenarios. The tab is a key conductive structure in a lithium battery that connects the electrode active materials, namely the positive and negative electrodes, enabling connection to the external circuit. It is usually made of metal foil. To ensure the stability and consistency of subsequent welding, the tab needs to be flattened to ensure the flatness of the tab. In the prior art, professional flattening equipment is usually used to evenly apply vertical pressure to both ends of the pole ear and rotate it. However, when the flattening structure is in direct contact with the pole ear part and rotates, metal debris is very likely to be generated and retained in the pole ear, which in turn leads to a decrease in the integrity of the pole ear after flattening, and a decrease in the quality of subsequent welding and power storage. The metal debris may also cause the battery to bulge, heat abnormally, or even explode, affecting the safety of use. Therefore, it is necessary to provide a pole ear flattening device for full-pole ear cylindrical lithium batteries. Summary of the Invention

[0003] In order to solve the problems raised in the above-mentioned background technology, the present invention provides a tab flattening device for a cylindrical lithium battery with full tabs, which solves the problem that when the flattening structure is in direct contact with the tab part and rotates, metal debris is very likely to be generated and retained in the tab, leading to subsequent dangerous situations.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solutions: a tab flattening device for a cylindrical lithium battery with full tabs, comprising a lithium battery; a base and a bracket mounted on the base; a motor mounted on the bracket, the output shaft of the motor being driven by a cross shaft; a support assembly slidably mounted on both ends of the top of the base; a protective assembly disposed on the bracket; the protective assembly comprising a dual-axis hydraulic rod fixed to the bracket, the two ends of the dual-axis hydraulic rod being hinged to the support assembly via two deflection plates; a flattening assembly rotatably mounted on each support assembly; the flattening assembly comprising a protective box rotatably mounted on the support assembly, a rubber pad being rotatably mounted on the side of the protective box, the side surfaces of the protective box and the rubber pad being adapted to fit within the interior of the lithium battery, a metal plate being connected to the interior of the protective box via a tension spring, a group of steel balls being connected in series to the side surfaces of the metal plate via a plurality of nylon ropes distributed circumferentially at equal angles, a metal column being mounted in the middle of the side surfaces of the protective box for contacting the center portion of the rubber pad; the output shaft of the motor driving the protective box to rotate via the cross shaft and the support assembly; and a conversion assembly mounted on each support assembly.

[0005] Preferably, there is a gap between the side of the metal plate and the interior of the protective box, and the interior 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 impregnated around the periphery of each steel ball.

[0006] Preferably, each two adjacent groups of steel balls are in an interlaced state, and the inner wall of the protective box is provided with a guide groove for rolling of the steel balls. The guide groove is divided into an axial groove and a radial groove. The steel balls are located inside the axial groove in the initial state.

[0007] Preferably, the support assembly includes a bracket 2 slidably mounted on the top of the base, a transmission shaft mounted on the outer periphery of the cross shaft is rotatably mounted inside the bracket 2, the protective box is rotatably mounted on the bracket 2, the transmission shaft is connected to the protective box through a belt 1, and the two movable ends of the dual-axis hydraulic rod are hinged to the bracket 2 through a guide plate respectively.

[0008] Preferably, the protective assembly also includes a protective plate and a metal sheet, and each of the two ends of the protective plate is respectively installed with a magnet 1. Every two adjacent protective plates are attracted to each other through the magnet 1 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 connected to the top of the bracket 1, and two magnets 3 are provided on both sides of the bracket 1, and the positions of the magnets 1 are adapted to the magnet 1.

[0009] Preferably, the protective assembly also includes a spring telescopic rod respectively hinged to the two movable ends of the biaxial hydraulic rod, the middle part of the spring telescopic rod is hinged and slides on the bracket one, the top of the spring telescopic rod is installed with a support rod, and the bottom of the two ends of the support rod is respectively installed with a magnet two, the positions of magnet two and magnet one are adapted, and the movable end of the spring telescopic rod is movably connected to the protective plate.

[0010] Preferably, the outer periphery of the magnet one is covered with a rubber layer, the outer side of the magnet one penetrates the rubber layer and is cylindrical, and the magnet two and the magnet three are both cylindrical.

[0011] Preferably, the conversion assembly includes a main shaft rotatably mounted on the second bracket, a group of metal blocks are mounted at equal angles on the outer circumference of the main shaft, and the main shaft is connected to the protective box through a second belt; The protection component also includes a driving slot composed of two adjacent magnets that are attracted together. The driving slot is adapted to the metal block, and the gap between each two sets of protection plates is adapted to the metal block.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The present invention cooperates with structures such as a flattening component and a motor, and the centrifugal force generated by the rotation of the protective box guides the steel balls to move outward, and eventually all of them roll on the side of the rubber pad. The metal columns on the metal plate are pulled by the nylon rope to hit the side of the rubber pad, and the noise generated by the rolling of the steel balls is reduced by the rubber pad. The side part of the protective box is located inside the rubber pad, and the pressure exerted by the steel balls is evenly transmitted to the rubber pad through the hard material on the side of the protective box. The part where the steel balls cannot exert pressure is replaced by the metal columns on the metal plate, and at the same time, it avoids the formation of grooves on the end of the pole ear during the rolling of the steel balls. After being separated by the rubber pad, the rotating part of the protective box does not directly hit the end of the pole ear, thereby avoiding hard contact and the falling of metal debris on the pole ear due to friction.

[0013] The present invention cooperates with structures such as protective components and lithium batteries. When the telescopic end of the double-axis hydraulic rod retracts, the top of the spring telescopic rod forcibly forces the two protective plates there to separate. The other protective plates and metal sheets are still attracted to each other and connected together through magnet one. When magnet one and magnet two attract each other, the spring telescopic rod will not be forced to drive the two protective plates to separate, and then they will detach from the spring telescopic rod, causing the state to be unable to work normally. This greatly improves the automation of the device, reduces the time and labor of manual fixation and removal of lithium batteries, and thereby improves the stability of the device.

[0014] The present invention cooperates with structures such as a conversion component and a protective component. When the protective box drives the main shaft to rotate through belt 2, the rotation direction of the main shaft is the same as the rotation direction of the protective box. The main shaft will also fit into the driving groove and the groove formed between the magnets on each two protective plates connected by metal sheets through the metal blocks on it. Therefore, at this time, the circle composed of several protective plates and metal sheets is driven to rotate, and the rotation direction is opposite to the rotation direction of the protective box, thereby further accelerating the speed of flattening the pole ears and improving the working efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the appearance structure of the present invention; Figure 2 This is a schematic diagram of the coordination between the motor and the support assembly structure of the present invention; Figure 3 This is a schematic diagram of the exploded structure of the cross shaft and the support assembly of the present invention; Figure 4 This is a schematic diagram of the internal structure of the protective box of the present invention; Figure 5 This is a schematic diagram of the exploded structure of the flattening component of the present invention; Figure 6 This is a schematic diagram of the coordination between the support 1 and the protective assembly structure of the present invention; Figure 7 This is a schematic diagram of the explosion of the protective component structure of the present invention; Figure 8 It is a schematic diagram of the structural coordination of the conversion component and the protection component of the present invention.

[0016] In the figure: 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. Protection assembly; 61. Dual-axis hydraulic rod; 62. Guide plate; 63. Spring telescopic rod; 64. Support rod; 65. Protection plate; 66. Metal sheet; 67. Magnet 1; 68. Magnet 2; 69. Magnet 3; 60. Drive slot; 7. Smoothing assembly; 71. Protection box; 72. Rubber pad; 73. Tension spring; 74. Metal plate; 75. Nylon rope; 76. Steel ball; 77. Guide slot; 8. Lithium battery. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] like Figures 1 to 8 As shown, the present invention provides a tab flattening device for a cylindrical lithium battery with full tabs, comprising a lithium battery 8; It also includes a base 1 and a bracket 2 installed on the base 1; The motor 3 is mounted on the bracket 2, and the output shaft of the motor 3 is driven by a cross shaft 31; Support components 4 slidably mounted on both ends of the top of the base 1; A protective component 6 is provided on the bracket 1 2; The protection assembly 6 includes a double-axis hydraulic rod 61 fixed on the bracket 2, and the two ends of the double-axis hydraulic rod 61 are hinged to the support assembly 4 through two push plates 62; Rotate the flattening components 7 mounted on each support component 4; The flattening assembly 7 includes a protective box 71 rotatably mounted on the support assembly 4. A rubber pad 72 is rotatably mounted on the side of the protective box 71. The sides of the protective box 71 and the rubber pad 72 are adapted to the interior of the lithium battery 8. The interior of the protective box 71 is connected to a metal plate 74 via a tension spring 73. The side of the metal plate 74 is connected in series with a group of steel balls 76 via a plurality of nylon ropes 75 distributed at equal angles in a circular direction. A metal column is installed in the middle of the side of the protective box 71 to abut the center part of the rubber pad 72. The output shaft of the motor 3 drives the protective box 71 to rotate through the cross shaft 31 and the support assembly 4; A conversion assembly 5 is installed on each supporting assembly 4.

[0019] Adopting the above solution: in the working state, the lithium battery 8 is located inside the protective component 6 and the tabs at both ends are partially exposed; The motor 3 forces the cross shaft 31 and the support assembly 4 to drive the protective box 71 to rotate; Since the side of the rubber pad 72 fits the pole ear part, it does not rotate. The centrifugal force generated by the rotation of the protective box 71 guides the steel balls 76 to move outward. Since each group of steel balls 76 is restricted by the nylon rope 75, there is no disorder after the steel balls 76. 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 columns 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 clamped to the side of the protective box 71, the noise generated by the rolling of the steel balls 76 is reduced. The side part of the protective box 71 is located inside the rubber pad 72. The pressure exerted by the steel balls 76 can be evenly transferred to the rubber pad 72 through the hard material on the side of the protective box 71, and then transmitted to the pole ear part of the lithium battery 8 by the rubber pad 72. The part where the steel balls 76 cannot apply pressure is replaced by the metal columns on the metal plate 74. This allows the steel ball 76 and the metal column to evenly apply pressure to the rubber pad 72, and also prevents the steel ball 76 from causing grooves on the end of the tab during rolling. Through the isolation of the rubber pad 72, the rotating part of the protective box 71 does not directly contact the end of the tab, thereby avoiding hard contact and metal debris falling from the tab due to friction. When the device stops working, the tension spring 73 pulls the several steel balls 76 through the metal plate 74 and the nylon rope 75 to gradually return to the initial position and no longer lie flat on the rubber pad 72, so as to avoid the steel balls 76 being loose when the device is not working, thereby causing the pressure applied by them to be uneven when working again, and indirectly causing the flattening quality to deteriorate; At the same time, the two ends of the dual-axis hydraulic rod 61 can be controlled to retract, and the support component 4 and the flattening component 7 can be pushed away from the lithium battery 8 through the push plate 62, thereby facilitating the staff or the robot in the factory to remove the lithium battery 8.

[0020] like Figure 2-Figure 5 As shown, there is a gap between the side of the metal plate 74 and the interior of the protective box 71 , and the interior 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 , and the lubricating oil is impregnated around the periphery of each steel ball 76 .

[0021] With the above solution, when the metal plate 74 moves, the air inside the protective box 71 circulates through the gap between the protective box 71 and the metal plate 74, thereby preventing the metal plate 74 from being difficult to move due to air pressure. When the protective box 71 starts to rotate, the centrifugal force generated by it can more quickly force the steel balls 76 to be flattened on the side of the rubber pad 72 and enter the working state, thereby improving the working efficiency of the device. When the steel balls 76 roll on the side of the rubber pad 72, the lubricating oil coated on its periphery prevents the collision or rolling of the steel balls 76 with each other from causing excessive losses. When several steel balls 76 are piled together and rub against each other, the lubricating oil can also prevent static electricity from being generated inside the protective box 71 and affecting the subsequent performance of the lithium battery 8.

[0022] like Figure 2-Figure 5 As shown, each two adjacent groups of steel balls 76 are in an interlaced state. The inner wall of the protective box 71 is provided with a guide groove 77 for the steel balls 76 to roll. 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.

[0023] Adopt above-mentioned scheme: when centrifugal tendency forces steel ball 76 to move, as Figure 5The guide groove 77 inside the protective box 71 shown in the figure can effectively guide the steel balls 76 to be evenly spread and rolled on the side of the rubber pad 72, and 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, so that when several steel balls 76 work together and roll on the rubber pad 72, the pressure generated is more uniform, further improving the quality of flattening the tabs.

[0024] like Figure 1-Figure 3 As shown, the support assembly 4 includes a bracket 2 41 slidably mounted on the top of the base 1, and a transmission shaft 42 sleeved on the outer periphery of the cross shaft 31 is rotatably mounted inside the bracket 2 41. The protective box 71 is rotatably mounted on the bracket 2 41, and the transmission shaft 42 is connected to the protective box 71 through a belt 1 43. The two movable ends of the dual-axis hydraulic rod 61 are hinged to the bracket 2 41 through a guide plate 62 respectively.

[0025] With the above solution, when the device completes its work, the dual-axis hydraulic rod 61 is controlled to retract, so that it pushes the bracket 2 41 to slide on the base 1 through the guide plate 62. At this time, the flattening component 7 can be separated from the lithium battery 8, making it easier for workers or a robot to grab the lithium battery 8. No manual intervention is required during the whole process, which greatly improves the automation and convenience of the device. Since the cross shaft 31 is not cylindrical, it is also movably connected to the transmission shaft 42. When the bracket 2 41 moves together with the transmission shaft 42, the output shaft of the motor 3 can still drive the transmission shaft 42 to rotate through the cross shaft 31, and then the transmission shaft 42 drives the protective box 71 to rotate through the belt 1 43 and enter the working state, which further improves the smoothness of the operation of the device.

[0026] like Figures 1-8 As shown, the protective assembly 6 also includes a protective plate 65 and a metal sheet 66. A magnet 67 is installed at both ends of each protective plate 65. Every two adjacent protective plates 65 are attracted to each other through 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 connected to the top of the bracket 2. Two magnets 69 are provided on both sides of the bracket 2, and the positions of the magnets 67 are adapted to the magnets 67.

[0027] The protective assembly 6 also includes a spring telescopic rod 63 hinged to the two movable ends of the biaxial 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 2 68 is installed at the bottom of each end of the support rod 64. The positions of magnet 2 68 and magnet 1 67 are adapted to each other. The movable end of the spring telescopic rod 63 is movably connected to the protective plate 65.

[0028] With the above solution, when the device is in a stationary state, the second magnet 68 and the corresponding first magnet 67 attract each other, and the third magnet 69 also attracts each other, so that when the protective plate 65 and the metal sheet 66 are in a stationary state, two adjacent protective plates 65 attracted together by the two first magnets 67 are movably engaged with the two spring telescopic rods 63 respectively. When the telescopic end of the biaxial hydraulic rod 61 retracts, since the middle part of the spring telescopic rod 63 is still hinged on the bracket 1 2, the top of the spring telescopic rod 63 can move away from the initial position and force the two protective plates 65 there to separate. Since there are still two protective plates 65 hinged on the bracket 1 2, the other protective plates 65 and the metal sheet 66 will still be attracted to each other and connected together through the magnet 1 67. Moreover, when the two magnets 1 67 and the magnet 2 68 attract each other, the spring telescopic rod 63 will not be forced to drive the two protective plates 65 to separate, and then they will be separated from the spring telescopic rod 63, thereby causing the state to malfunction. This greatly improves the automation of the device, reduces the time and labor for manual fixing and removing the lithium battery 8, and even when the robot grabs the lithium battery 8 and places it on each group of protective plates 65 and metal sheets 66, the dual-axis hydraulic rod 61 stretches and pushes the spring telescopic rod 63 to move the two protective plates 65 on it and re-bond them through magnet 67. After the array of protective plates 65 and metal sheets 66 are merged into a whole circle, the position of the lithium battery 8 can be further limited, so that the protective box 71 can accurately enter the interior of the lithium battery 8, thereby improving the stability of the device operation.

[0029] like Figures 1-8 As shown, the outer periphery of magnet 1 67 is covered with a rubber layer, the outer side of magnet 1 67 penetrates the rubber layer and is cylindrical, and magnet 2 68 and magnet 3 69 are both cylindrical.

[0030] The above solution is adopted: the rubber layer allows magnet 1 67 to have magnetic force while preventing the two magnets 1 67 from attracting each other and colliding with each other to cause breakage. The cylindrical part extending from the outside of magnet 1 67 can also ensure that it can be well attracted to magnet 3 69 or magnet 2 68, thereby not affecting subsequent work.

[0031] like Figures 1-8 As shown, the conversion assembly 5 includes a main shaft 51 rotatably mounted on the second bracket 41, a group of metal blocks 53 are mounted at equal angles around the outer periphery of the main shaft 51, and the main shaft 51 is connected to the protective box 71 through the second belt 52; The protective assembly 6 also includes a driving slot 60 composed of two adjacent magnets 67 that are attracted together. The driving slot 60 is adapted to the metal block 53, and the gap between each two sets of protective plates 65 is adapted to the metal block 53.

[0032] With the above solution, when the protective box 71 drives the main shaft 51 to rotate via the second belt 52, the main shaft 51 rotates in the same direction as the protective box 71. The main shaft 51 also fits into the gap between the driving groove 60 and each set of protective plates 65 in sequence through the metal block 53 thereon. Therefore, at this time, the circle composed of several protective plates 65 and metal sheets 66 is driven to rotate, and the rotation direction is opposite to the rotation direction of the protective box 71, thereby further accelerating the speed of flattening the tabs and improving the working efficiency of the device. The grooves formed between the magnets 67 on each two protective plates 65 connected by the metal sheet 66 and the outer side of the driving slot 60 are both open, so when the metal block 53 detaches from or contacts the protective component 6 through the support component 4, it will not cause jamming, which makes the working performance of the device more stable and smooth.

[0033] The working principle and use process of the present invention are as follows: when in working state, the lithium battery 8 is located inside the protective component 6 and the pole ear parts at both ends are exposed; the motor 3 drives the protective box 71 to rotate through the cross shaft 31, the transmission shaft 42 and the belt 1 43; the centrifugal tendency generated by the rotation of the protective box 71 guides the steel balls 76 to move outward, and finally all roll on the surface of the rubber pad 72 located inside the protective box 71, and the steel balls 76 also pull the metal columns on the metal plate 74 through the nylon rope 75 to hit the side of the rubber pad 72. The side part of the protective box 71 is located inside the rubber pad 72. The pressure exerted by the steel balls 76 can be evenly transferred to the rubber pad 72 through the hard material on the side of the protective box 71, and then transmitted to the pole ear part of the lithium battery 8 by the rubber pad 72. The part that the steel balls 76 cannot apply pressure is replaced by the metal columns on the metal plate 74; this can make the steel balls 76 and the metal The column evenly applies pressure to the pole ear through the rubber pad 72; after completing the work, the two ends of the double-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 double-axis hydraulic rod 61 retracts, since the middle part of the spring telescopic rod 63 is still hinged on the bracket 1 2, the top of the spring telescopic rod 63 can be away from the initial position and force the two protective plates 65 there to separate. Since there are two protective plates 65 hinged on the bracket 1 2, the other protective plates 65 and the metal sheet 66 will still be attracted to each other and connected together through the magnet 1 67, and when the two magnets 1 67 and the magnet 2 68 attract each other, they will not force the spring telescopic rod 63 to drive the two protective plates 65 apart, and they will detach from the spring telescopic rod 63; the lithium battery 8 that has not been flattened can be taken and replaced by a robot or manually.

[0034] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0035] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention 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) mounted on bracket one (2), wherein the output shaft of the motor (3) is driven by a cross shaft (31); Support components (4) slidably mounted on both ends of the top of the base (1); A protective assembly (6) disposed on the first bracket (2); The protection assembly (6) includes a double-axis hydraulic rod (61) fixed on the bracket (2), and the two ends of the double-axis hydraulic rod (61) are respectively hinged to the support assembly (4) through two push-guide plates (62); Rotating the flattening components (7) mounted on each supporting component (4); The flattening assembly (7) includes a protective box (71) rotatably mounted on the supporting assembly (4), a rubber pad (72) is rotatably mounted on the side of the protective box (71), the side surfaces of the protective box (71) and the rubber pad (72) are adapted to the interior of the lithium battery (8), the interior of the protective box (71) is connected to a metal plate (74) via a tension spring (73), the side surface of the metal plate (74) is connected in series with a group of steel balls (76) via a plurality of nylon ropes (75) distributed at equal angles in a circular direction, and a metal column for contacting the central portion of the rubber pad (72) is mounted in the middle of the side surface 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); A conversion assembly (5) is mounted on each supporting assembly (4).

2. The tab flattening device for cylindrical lithium batteries with full tabs according to claim 1, characterized in that: There is a gap between the side of the metal plate (74) and the interior of the protective box (71), and the interior 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), and the lubricating oil is impregnated on the periphery of each steel ball (76).

3. The tab flattening device for cylindrical lithium batteries with full tabs according to claim 2, characterized in that: Each two adjacent groups of steel balls (76) are in a staggered state. The inner wall of the protective box (71) is provided with a guide groove (77) for the steel balls (76) to roll. 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 an initial state.

4. The tab flattening device for cylindrical lithium batteries with full tabs according to claim 3, characterized in that: The support assembly (4) includes a bracket 2 (41) slidably mounted on the top of the base (1), a transmission shaft (42) sleeved on the outer periphery of the cross shaft (31) is rotatably mounted inside the bracket 2 (41), the protection box (71) is rotatably mounted on the bracket 2 (41), the transmission shaft (42) is connected to the protection box (71) through a belt 1 (43), and the two movable ends of the dual-axis hydraulic rod (61) are respectively hinged to the bracket 2 (41) through a guide plate (62).

5. The tab flattening device for cylindrical lithium batteries with full tabs according to claim 4, characterized in that: The protective assembly (6) further includes a protective plate (65) and a metal sheet (66), each of the two ends of the protective plate (65) is respectively provided with a magnet (67), and every two adjacent protective plates (65) are attracted to each other by the magnet (67) to form a group, and the protective plate (65) and the metal sheet (66) form a circle and are wrapped around the periphery of the lithium battery (8), and the protective plate (65) is movably connected to the top of the bracket (2), and two magnets (69) are provided on both sides of the bracket (2) at positions that are compatible with the magnet (67).

6. The tab flattening device for cylindrical lithium batteries with full tabs according to claim 5, characterized in that: The protective assembly (6) further comprises a spring telescopic rod (63) respectively hinged to the two movable ends of the biaxial hydraulic rod (61), the middle portion of the spring telescopic rod (63) being hinged and sliding on the bracket (2), the top end of the spring telescopic rod (63) being mounted with a support rod (64), the bottom ends of the support rod (64) being respectively mounted with a second magnet (68), the positions of the second magnet (68) and the first magnet (67) being adapted to each other, and the movable end of the spring telescopic rod (63) being movably engaged with the protective plate (65).

7. The tab flattening device for cylindrical lithium batteries with full tabs according to claim 6, characterized in that: The outer periphery of the magnet one (67) is covered with a rubber layer, the outer side of the magnet one (67) penetrates the rubber layer and is cylindrical, and the magnet two (68) and the magnet three (69) are both cylindrical.

8. The tab flattening device for cylindrical lithium batteries with full tabs according to claim 7, characterized in that: The conversion assembly (5) includes a main shaft (51) rotatably mounted on a second bracket (41), a group of metal blocks (53) are mounted on the outer periphery of the main shaft (51) at equal angles, and the main shaft (51) is connected to the protective box (71) through a second belt (52); The protective assembly (6) further includes a driving slot (60) composed of two adjacent magnets (67) that are attracted together. The driving slot (60) is adapted to the metal block (53), and the gap between each two sets of protective plates (65) is adapted to the metal block (53).

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