A bending device and method for aluminum-cased lithium-ion battery tabs

Abstract

This invention relates to a bending device for aluminum-cased lithium-ion battery tabs, comprising a first rotary chain and a second rotary chain, a first trolley slidably mounted on the first rotary chain for carrying the battery, and a second trolley slidably mounted on the second rotary chain. A guide assembly and a movable frame driven by the guide assembly are provided on the second rotary chain. A first drive assembly, a second drive assembly, a first bending assembly driven by the first drive assembly, and a second bending assembly driven by the second drive assembly are sequentially arranged along the moving path of the movable frame. A top extension assembly is provided on the movable frame, comprising several top extension rods. The movable frame is used to drive the first bending assembly to clamp the tabs on the battery. The first bending assembly is used to perform a first 90° bend on the tabs. The top extension assembly uses the top extension rods to abut or release the abutment on the tabs. The second bending assembly is used to perform a second 90° bend on the tabs, greatly improving bending efficiency.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and more specifically to a bending device and method for aluminum-cased lithium-ion battery tabs. Background Technology

[0002] A lithium-ion battery cell has tabs at one end, typically two: a positive tab and a negative tab. Tabs are a structural feature of lithium-ion batteries, representing the metal conductors that connect the positive and negative electrodes within the cell. Cell manufacturing involves a series of processes, including tab bending. Chinese patent CN 114289576B discloses a lithium-ion battery tab bending device, belonging to the field of lithium-ion battery manufacturing technology. It includes a tab bending mechanism and a battery conveying mechanism. The tab bending mechanism includes a vertically arranged rotating shaft with a pair of turntables mounted on it. The rotating shaft is connected to the outer periphery of the turntables, and a pressure cylinder for bending the tabs is mounted outside the rotating shaft. The battery conveying mechanism includes a slide rail and a slide block slidably mounted on the slide rail. The sliding direction of the slide block is tangential to the rotation trajectory of the turntables. A clamp for positioning the battery is fixed to one side of the slide block, and a positioning strip abuts against the bent side of the battery tab at the end of the slide block near the turntable. This invention features a high degree of automation, which improves the efficiency of battery tab bending. Before the battery tab enters the tangent point, the pressure cylinder has already contacted the battery tab to form a pre-bend, thereby reducing the shear force on the battery tab at the tangent point, preventing the battery tab root from being pulled or cracked, and improving the product yield.

[0003] However, the inventors discovered that in actual bending processes, traditional tab handling methods often rely on manual operation.

[0004] Bending and shaping the tabs by hand makes it difficult to ensure consistency in the bending angle, length, and shape, and the bending efficiency is low. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a bending device for aluminum-cased lithium-ion battery tabs. The device automatically bends the tabs using a first bending component and a second bending component, which greatly improves bending efficiency while ensuring bending quality.

[0006] The technical solution of the present invention is as follows:

[0007] A bending device for aluminum-cased lithium-ion battery tabs includes a first rotary chain and a second rotary chain, a first trolley slidably mounted on the first rotary chain for carrying the battery, and a second trolley slidably mounted on the second rotary chain. A guide assembly and a movable frame driven by the guide assembly are provided on the second rotary chain. A first drive assembly, a second drive assembly, a first bending assembly driven by the first drive assembly, and a second bending assembly driven by the second drive assembly are sequentially arranged along the moving path of the movable frame. A top extension assembly is provided on the movable frame, and the top extension assembly includes several top extension rods. The movable frame is used to drive the first bending assembly to clamp the tabs on the battery. The first bending assembly is used to perform a first 90° bend on the tabs. The top extension assembly uses the top extension rods to abut or release the abutment on the tabs. The second bending assembly is used to perform a second 90° bend on the tabs.

[0008] As a preferred embodiment, the guiding assembly includes a guide rail fixedly mounted on the second rotary chain and a guide rod fixedly mounted on the movable frame. The movable frame is slidably mounted on the second trolley. The end of the guide rod is spherical and cooperates with the guide rail. The guide rail consists of an ascending section, a descending section, and a holding section.

[0009] As a preferred embodiment, the first drive assembly includes a rotating shaft rotatably mounted on a movable frame, a first bevel gear fixedly mounted on the rotating shaft, a first gear rotatably mounted on the movable frame, a second bevel gear fixedly mounted on a first gear shaft, a first rack fixedly mounted on a second rotary chain, and a fifth rack fixedly mounted above the second rotary chain. The first bevel gear meshes with the second bevel gear, and the first gear meshes with both the first rack and the fifth rack.

[0010] As a preferred embodiment, the first bending assembly includes a first bending plate fixedly disposed on a rotating shaft and a first bending roller fixedly disposed on one side of the first bending plate.

[0011] As a preferred embodiment, the top extension assembly further includes a slot formed in the first bending plate, a fixed sleeve fixedly mounted on the movable frame, a fixed cylinder fixedly mounted inside the fixed sleeve, a second rack fixedly mounted on the top extension rod, a second gear rotatably mounted on the fixed cylinder, a third gear fixedly mounted on the second gear shaft, and a third rack and a fourth rack fixedly mounted on one side of the second rotary chain. The top extension rod is slidably fitted with the fixed cylinder, and the second racks on both sides mesh with the second gears. The third gears mesh with the third rack and the fourth rack.

[0012] As a preferred embodiment, the second drive assembly includes a track fixedly disposed above the second rotary chain, a base plate slidably disposed on the track, a groove formed on the base plate, a hinge seat slidably disposed in the groove, and an extension rod rotatably disposed on the base plate. The hinge seat is hinged to the extension rod. The track is composed of a first inclined section, a parallel section, and a second inclined section. The fifth rack is fixedly disposed on the track.

[0013] As a preferred embodiment, the second bending assembly includes a second bending plate rotatably disposed between the first bending plate and the movable frame, and a second bending roller fixedly disposed on the second bending plate, wherein the second bending plate is fixedly connected to the base plate.

[0014] As a preferred embodiment, both the first bending roller and the second bending roller are provided with a rubber layer.

[0015] Another objective of this invention is to address the shortcomings of existing technologies by providing a method for bending the tabs of an aluminum-cased lithium-ion battery, comprising the following steps:

[0016] Step 1: After the first trolley and the second trolley respectively carry the battery and the corresponding mobile frame, the mobile frame moves closer to the battery through the rising section until the electrode tab is clamped between the first bending plate and the second bending plate.

[0017] Step 2: After the first gear passes through the first rack, it drives the first bending plate to perform the first 90° rotational bending of the pole lug. At the same time, the base plate passes through the first inclined section, causing the second bending plate to rotate 90°.

[0018] Step 3: When the base plate passes through the second inclined section, it drives the second bending plate to perform a second 90° rotation and bend on the electrode lug;

[0019] Step 4: When the third gear passes the third rack, it drives the second gear to rotate, causing the second racks on both sides to move. This drives the two push rods to extend into the fixed cylinder, and then the battery is removed manually or by a robotic arm.

[0020] Step 5: As the first gear passes the fifth rack, the third gear passes the fourth rack, causing the first bending plate to reset and the two top extension rods to extend out of the fixed cylinder and reset, preparing for the next bending.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. The present invention is provided with a first bending component and a second bending component, which automatically completes the bending of the electrode tab by means of a rotating chain, thereby improving bending efficiency and quality.

[0023] 2. The present invention also includes a top extension assembly, which provides abutment support to the tab by means of the top extension rod, so that the tab is supported at the folding point when it is bent to prevent the folding point from breaking. At the same time, when the top extension rod is no longer in contact with the tab, it is convenient to remove the battery.

[0024] In summary, this invention has the advantages of good bending effect and fast speed, and is suitable for the field of battery production technology. Attached Figure Description

[0025] The invention will be further described below with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of a bending device for the tabs of an aluminum-cased lithium-ion battery.

[0027] Figure 2 This is a schematic diagram of the structure of the first bending component;

[0028] Figure 3 This is a schematic diagram of the second bending assembly;

[0029] Figure 4 A schematic diagram showing the state when the electrode tabs are clamped inside the first bending plate for the movement of the movable frame;

[0030] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0031] Figure 6 This is a schematic diagram showing the state when the first gear drives the first bending plate to bend the pole lug for the first time via the first rack.

[0032] Figure 7 for Figure 6 Enlarged view at point B in the middle;

[0033] Figure 8 This is a schematic diagram showing the state when the first bending plate rotates and the second bending plate rotates simultaneously.

[0034] Figure 9 for Figure 8 Enlarged view at point C;

[0035] Figure 10 This is a schematic diagram showing the state of the electrode lug being bent for the second time by the second bending plate.

[0036] Figure 11 for Figure 10 Enlarged view at point H;

[0037] Figure 12 This is a schematic diagram showing the state when the third gear drives the top extension rod to extend into the fixed cylinder via the third rack.

[0038] Figure 13 for Figure 12 Enlarged view at point D;

[0039] Figure 14 This is a schematic diagram showing the state when the top extension rod and the pole lug are no longer in contact.

[0040] Figure 15 for Figure 14 Enlarged view at point E in the middle;

[0041] Figure 16 This is a schematic diagram showing the state when the third gear drives the extension rod to extend through the fourth rack.

[0042] Figure 17 for Figure 16 Enlarged view at point F;

[0043] Figure 18 This is a schematic diagram showing the state when the first gear drives the first bent plate to reset via the fifth rack.

[0044] Figure 19 for Figure 18 Enlarged view at point G;

[0045] Reference numerals: 1 First slewing chain, 2 Second slewing chain, 3 Battery, 4 First trolley, 5 Second trolley, 6 Guide assembly, 61 Guide rail, 62 Guide rod, 63 Ascending section, 64 Descending section, 65 Holding section, 7 Moving frame, 8 First drive assembly, 81 Rotating shaft, 82 First bevel gear, 83 First gear, 84 Second bevel gear, 85 First rack, 86 Fifth rack, 9 Second drive assembly, 92 Track, 93 Base plate, 94 Slide groove, 95 Hinge seat, 96 Extension Extension rod, 97 First inclined section, 98 Parallel section, 99 Second inclined section, 10 First bending assembly, 101 First bending plate, 103 First bending roller, 11 Second bending assembly, 111 Second bending plate, 112 Second bending roller, 12 Top extension assembly, 121 Top extension rod, 122 Groove, 123 Fixing sleeve, 124 Fixing cylinder, 125 Second rack, 126 Second gear, 127 Third gear, 128 Third rack, 129 Fourth rack, 13 Pole lug. Detailed Implementation

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0047] Example 1

[0048] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0049] like Figures 1 to 19As shown, a bending device for the tabs of an aluminum-cased lithium-ion battery includes a first rotary chain 1 and a second rotary chain 2, a first trolley 4 slidably mounted on the first rotary chain 1 for carrying a battery 3, and a second trolley 5 slidably mounted on the second rotary chain 2. A guide assembly 6 and a movable frame 7 driven by the guide assembly 6 are provided on the second rotary chain 2. A first drive assembly 8, a second drive assembly 9, a first bending assembly 10 driven by the first drive assembly 8, and a second bending assembly 11 driven by the second drive assembly 9 are sequentially arranged along the moving path of the movable frame 7. The movable frame 7 is equipped with a top extension assembly 12, which includes several top extension rods 121. The movable frame 7 is used to drive the first bending assembly 10 to clamp the tabs 13 on the battery 3. The first bending assembly 10 is used to bend the tabs 13 by 90° for the first time. The top extension assembly 12 abuts or releases the abutment of the tabs 13 through the top extension rods 121. The second bending assembly 11 is used to bend the tabs 13 by 90° for the second time. The first trolley 4 and the second trolley 5 on the first rotary chain 1 and the second rotary chain 2 always remain synchronized during rotation.

[0050] It is worth mentioning that, such as Figure 4 and Figure 5 As shown, the guide assembly 6 includes a guide rail 61 fixedly mounted on the second rotary chain 2 and a guide rod 62 fixedly mounted on the movable frame 7. The movable frame 7 is slidably mounted on the second trolley 5. The end of the guide rod 62 is spherical and cooperates with the guide rail 61. The guide rail 61 consists of an ascending section 63, a descending section 64, and a holding section 65. In use, the battery 3 is placed on the first trolley 4 manually or by a robot. The first trolley 4 and the second trolley 5 rotate synchronously. During this process, the guide rod 62 on the movable frame 7 first passes through the descending section 64, driving the movable frame 7 to move towards the chain. Then, after the movable frame 7 and the battery 3 are on the same horizontal plane, the guide rod 62 passes through the ascending section 63, driving the movable frame 7 to move closer to the battery 3, so that the tab 13 extends into the first bending assembly 10, ready for the bending process.

[0051] It needs to be emphasized that, such as Figure 2 As shown, the first drive assembly 8 includes a rotating shaft 81 rotatably mounted on the movable frame 7, a first bevel gear 82 fixedly mounted on the rotating shaft 81, a first gear 83 rotatably mounted on the movable frame 7, a second bevel gear 84 fixedly mounted on the shaft of the first gear 83, a first rack 85 fixedly mounted on the second rotary chain 2, and a fifth rack 86 fixedly mounted above the second rotary chain 2. The first bevel gear 82 meshes with the second bevel gear 84, and the first gear 83 meshes with both the first rack 85 and the fifth rack 86.

[0052] It should be further explained that, such as Figures 6 to 19As shown, the first bending assembly 10 includes a first bending plate 101 fixedly mounted on a rotating shaft 81 and a first bending roller 103 fixedly mounted on one side of the first bending plate 101. The first gear 83 is first reset by the fifth rack 86, so that the first bending plate 101 is in a horizontal state. In use, when the tab 13 is inserted into the first bending plate 101, the first gear 83 passes through the first rack 85, and drives the rotating shaft 81 and the first bending plate 101 to rotate 90° through the first bevel tooth 82 and the second bevel tooth 84, so that the front end of the tab 13 is bent upward and the tab 13 is bent into an L shape. In addition, the first bending roller 103 plays a lubricating role to prevent damage to the tab 13.

[0053] It is worth mentioning that, such as Figures 12 to 17 As shown, the top extension assembly 12 also includes a slot 122 formed on the first bending plate 101, a fixed sleeve 123 fixedly mounted on the movable frame 7, a fixed cylinder 124 fixedly mounted inside the fixed sleeve 123, a second rack 125 fixedly mounted on the top extension rod 121, a second gear 126 rotatably mounted on the fixed cylinder 124, a third gear 127 fixedly mounted on the shaft of the second gear 126, and a third rack 128 and a fourth rack 129 fixedly mounted on one side of the second rotary chain 2. The top extension rod 121 slides in cooperation with the fixed cylinder 124, and the second racks 125 on both sides... All of them mesh with the second gear 126. The third gear 127 meshes with the third rack 128 and the fourth rack 129. The third gear 127 first passes through the fourth rack 129 to reset the top extension rod 121. The top extension rod 121 extends out of the fixed cylinder 124. In use, when the pole lug 13 is inserted into the first bending plate 101, the top extension rod 121 is located at the bending point of the pole lug 13. When the first bending plate 101 drives the front end of the pole lug 13 to bend upward, the top extension rod 121 provides support, making the pole lug 13 more lubricated when it is folded up, and preventing breakage at the bending point.

[0054] Furthermore, such as Figure 3 As shown, the second drive assembly 9 includes a track 92 fixedly mounted above the second rotary chain 2, a base plate 93 slidably mounted on the track 92, a groove 94 opened on the base plate 93, a hinge seat 95 slidably mounted in the groove 94, and an extension rod 96 rotatably mounted on the base plate 93. The hinge seat 95 and the extension rod 96 are hinged together. The track 92 is composed of a first inclined section 97, a parallel section 98, and a second inclined section 99. The fifth rack 86 is fixedly mounted on the track 92.

[0055] In addition, such as Figures 8 to 15As shown, the second bending assembly 11 includes a second bending plate 111 rotatably disposed between the first bending plate 101 and the movable frame 7, and a second bending roller 112 fixedly disposed on the second bending plate 111. The second bending plate 111 is fixedly connected to the base plate 93. In use, when the first gear 83 passes the first rack 85, causing the first bending plate 101 to fold up the front end of the tab 13, the base plate 93 passes the first inclined section 97 and moves downward and backward. Through the hinge seat 95 and the extension rod 96, the second bending plate 111 is driven to rotate synchronously with the first bending plate 101. At this time, the extension rod 96 and the base plate 93 are connected. At the same horizontal plane, the base plate 93 then passes through the second inclined section 99, and moves upward and forward, pushing the extension rod 96 and the second bending plate 111 to rotate 90°, so that the second bending plate 111 folds the front end of the folded tab 13 to the side, and the tab 13 changes from an L shape to a Z shape, completing the second bending. Then, the third gear 127 passes through the third rack 128, driving the second gear 126 to rotate, so that the two second racks 125 move towards each other, driving the two top extension rods 121 to extend into the fixed cylinder 124 until the top extension rods 121 disengage from the tab 13, and the battery 3 is removed manually or by a robot.

[0056] Furthermore, such as Figure 3 As shown, both the first bending roller 103 and the second bending roller 112 are provided with a rubber layer to reduce wear.

[0057] Example 2

[0058] A bending method for a bending device for aluminum-cased lithium-ion battery tabs includes the following steps:

[0059] Step 1: After the first trolley 4 and the second trolley 5 respectively carry the battery 3 and the corresponding mobile frame 7, the mobile frame 7 moves closer to the battery 3 through the rising section 63 until the electrode tab 13 is clamped between the first bending plate 101 and the second bending plate 111.

[0060] Step 2: After the first gear 83 passes through the first rack 85, it drives the first bending plate 101 to perform the first 90° rotational bending of the pole lug 13. At the same time, the base plate 93 passes through the first inclined section 97, causing the second bending plate 111 to rotate 90°.

[0061] Step 3: When the base plate 93 passes through the second inclined section 99, it drives the second bending plate 111 to perform a second 90° rotation and bending of the pole lug 13;

[0062] Step 4: When the third gear 127 passes the third rack 128, it drives the second gear 126 to rotate, causing the second racks 125 on both sides to move. This drives the two push rods 121 to extend into the fixed cylinder 124, and then the battery 3 is removed manually or by a robotic arm.

[0063] Step 5: As the first gear 83 passes the fifth rack 86, the third gear 127 passes the fourth rack 129, causing the first bending plate 101 to reset and the two top extension rods 121 to extend out of the fixed cylinder 124 and reset, preparing for the next bending.

[0064] Work process

[0065] Battery 3 is placed on the first trolley 4 manually or by a robotic arm. The first trolley 4 and the second trolley 5 rotate synchronously. During this process, the guide rod 62 on the moving frame 7 first passes through the descending section 64, driving the moving frame 7 to move towards the chain. Then, after the moving frame 7 and battery 3 are on the same horizontal plane, the guide rod 62 passes through the ascending section 63, driving the moving frame 7 closer to battery 3, so that the electrode tab 13 extends into the first bending plate 101. The first gear 83 passes through the first rack 85, and through the first bevel gear 82 and the second bevel gear 84, drives the rotating shaft 81 and the first bending plate 101 to rotate 90°, so that the front end of the electrode tab 13 bends upward. At the same time, the base plate 93 passes through the first inclined section 97, and the base plate 93 moves downward and backward, driven by the hinge seat 95 and the extension rod 96. The second bending plate 111 rotates synchronously with the first bending plate 101. At this time, the extension rod 96 and the base plate 93 are on the same horizontal plane. Then, the base plate 93 passes through the second inclined section 99 and moves upward and forward, pushing the extension rod 96 and the second bending plate 111 to rotate 90°, so that the second bending plate 111 folds the front end of the folded tab 13 to the side, and the tab 13 changes from an L shape to a Z shape, completing the second bending. Then, the third gear 127 passes through the third rack 128 and drives the second gear 126 to rotate, so that the two second racks 125 move towards each other, driving the two top extension rods 121 to extend into the fixed cylinder 124 until the top extension rods 121 disengage from the tab 13 and the battery 3 is removed manually or by a robot.

[0066] In the description of this invention, it should be understood that the terms "front and back", "left and right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0067] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.

[0068] The above description, in conjunction with the accompanying drawings, represents only preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention. These modifications and improvements should also be considered within the scope of protection of the present invention and will not affect the effectiveness and practicality of the present invention.

Claims

1. A bending device for aluminum-cased lithium-ion battery tabs, comprising a first rotating chain (1) and a second rotating chain (2), a first trolley (4) slidably disposed on the first rotating chain (1) for carrying a battery (3), and a second trolley (5) slidably disposed on the second rotating chain (2), characterized in that: The second rotary chain (2) is provided with a guide component (6) and a moving frame (7) driven by the guide component (6). The moving frame (7) is provided with a first drive component (8), a second drive component (9), a first bending component (10) driven by the first drive component (8), and a second bending component (11) driven by the second drive component (9) in sequence along its moving path. The moving frame (7) is provided with a top extension component (12). The top extension component (12) includes several top extension rods (121). The moving frame (7) is used to drive the first bending component (10) to clamp the tab (13) on the battery (3). The first bending component (10) is used to bend the tab (13) for the first time by 90°. The top extension component (12) abuts or cancels the abutment of the tab (13) through the top extension rods (121). The second bending component (11) is used to bend the tab (13) for the second time by 90°.

2. The bending device for the tabs of an aluminum-cased lithium-ion battery according to claim 1, characterized in that: The guide assembly (6) includes a guide rail (61) fixedly mounted on the second rotary chain (2) and a guide rod (62) fixedly mounted on the movable frame (7). The movable frame (7) is slidably mounted on the second trolley (5). The end of the guide rod (62) is spherical and cooperates with the guide rail (61). The guide rail (61) consists of an ascending section (63), a descending section (64), and a holding section (65).

3. The bending device for the aluminum-cased lithium-ion battery tab according to claim 1, characterized in that: The first drive assembly (8) includes a rotating shaft (81) rotatably mounted on a movable frame (7), a first bevel tooth (82) fixedly mounted on the rotating shaft (81), a first gear (83) rotatably mounted on the movable frame (7), a second bevel tooth (84) fixedly mounted on the shaft of the first gear (83), a first rack (85) fixedly mounted on the second rotary chain (2), and a fifth rack (86) fixedly mounted above the second rotary chain (2). The first bevel tooth (82) meshes with the second bevel tooth (84), and the first gear (83) meshes with both the first rack (85) and the fifth rack (86).

4. The bending device for the tabs of an aluminum-cased lithium-ion battery according to claim 3, characterized in that: The first bending assembly (10) includes a first bending plate (101) fixedly disposed on a rotating shaft (81) and a first bending roller (103) fixedly disposed on one side of the first bending plate (101).

5. The bending device for the aluminum-cased lithium-ion battery tab according to claim 4, characterized in that: The top extension assembly (12) further includes a slot (122) opened on the first bending plate (101), a fixed sleeve (123) fixedly mounted on the movable frame (7), a fixed cylinder (124) fixedly mounted in the fixed sleeve (123), a second rack (125) fixedly mounted on the top extension rod (121), a second gear (126) rotatably mounted on the fixed cylinder (124), a third gear (127) fixedly mounted on the shaft of the second gear (126), and a third rack (128) and a fourth rack (129) fixedly mounted on one side of the second rotating chain (2). The top extension rod (121) slides with the fixed cylinder (124), and the second racks (125) on both sides mesh with the second gear (126). The third gear (127) meshes with the third rack (128) and the fourth rack (129).

6. The bending device for the aluminum-cased lithium-ion battery tab according to claim 4, characterized in that: The second drive assembly (9) includes a track (92) fixedly mounted above the second rotary chain (2), a base plate (93) slidably mounted on the track (92), a groove (94) opened on the base plate (93), a hinge seat (95) slidably mounted in the groove (94), and an extension rod (96) rotatably mounted on the base plate (93). The hinge seat (95) and the extension rod (96) are hinged together. The track (92) is composed of a first inclined section (97), a parallel section (98), and a second inclined section (99). The fifth rack (86) is fixedly mounted on the track (92).

7. A bending device for aluminum-cased lithium-ion battery tabs according to claim 6, characterized in that: The second bending assembly (11) includes a second bending plate (111) rotatably disposed between the first bending plate (101) and the movable frame (7), and a second bending roller (112) fixedly disposed on the second bending plate (111). The second bending plate (111) is fixedly connected to the base plate (93).

8. The bending device for the aluminum-cased lithium-ion battery tab according to claim 7, characterized in that: Both the first bending roller (103) and the second bending roller (112) are provided with a rubber layer.

9. A bending method using the bending device for aluminum-cased lithium-ion battery tabs as described in claims 1-8, comprising the following steps: Step 1: After the first trolley (4) and the second trolley (5) respectively carry the battery (3) and the corresponding mobile frame (7), the mobile frame (7) moves closer to the battery (3) through the rising section (63) until the electrode (13) is clamped between the first bending plate (101) and the second bending plate (111); Step 2: After the first gear (83) passes through the first rack (85), it drives the first bending plate (101) to perform the first 90° rotation bend on the pole lug (13). At the same time, the base plate (93) passes through the first inclined section (97), causing the second bending plate (111) to rotate 90°. Step 3: When the base plate (93) passes through the second inclined section (99), it drives the second bending plate (111) to perform a second 90° rotation bend on the pole lug (13); Step 4: When the third gear (127) passes through the third rack (128), it drives the second gear (126) to rotate, causing the second racks (125) on both sides to move, driving the two top extension rods (121) to extend into the fixed cylinder (124), and then the battery (3) is taken out manually or by a robot. Step 5: As the first gear (83) passes the fifth rack (86), the third gear (127) passes the fourth rack (129), causing the first bending plate (101) to reset and the two top extension rods (121) to extend out of the fixed cylinder (124) and reset, in preparation for the next bending.

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