Bending device
By designing a bending device, the pinch assembly and bending assembly are used to bending the battery cell ear in step, solving the problem of the long extension length of the battery cell ear, and improving the space utilization and bending of the battery cell The accuracy of the process.
Patent Information
- Application Number
- CN202421102994.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-20
AI Technical Summary
In existing electric vehicles and electric energy storage devices, the pole ears of the battery cell protruding length after welding is long, resulting in low space utilization and insufficient energy density per unit space.
A bending device is designed, including a clamping assembly, a first bending assembly and a second bending assembly, and the battery cell is fixed by a clamping assembly, the first bending assembly and the second bending assembly are arranged at a distance, and the pole ear is placed In between, the length of the ear is reduced by step bending, and the space utilization of the battery cell is improved.
It effectively reduces the space demand of the battery cell, improves the overall space utilization of the battery cell, ensures the accuracy and repetition of the bending process of the battery cell, and avoids damage caused by excessive bending of the electrode.
Smart Images
Figure CN222288617U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a bending device. Background Art
[0002] Existing electric vehicles and electric energy storage devices require higher energy density per unit space; the requirements for the control of battery cell size have become stricter, and the space utilization rate of the battery cell needs to be improved. After the battery cell's tabs are welded to the battery body, they extend for a long time, leaving a large space on the top of the finished battery cell, resulting in low space utilization of the battery cell, large overall battery cell volume, and low energy density per unit space. Utility Model Content
[0003] The purpose of the present application is to provide a bending device to solve the problem that the tab of the battery cell extends too long.
[0004] To achieve the purpose of this application, this application provides the following technical solutions:
[0005] The utility model provides a bending device suitable for bending the pole ear of a battery cell, the bending device comprises a clamping assembly, a first bending assembly and a second bending assembly, the clamping assembly is used to clamp the battery cell; the first bending assembly and the second bending assembly are arranged at a relative interval, the pole ear is placed between the first bending assembly and the second bending assembly, and the first bending assembly moves toward the second bending assembly, and the second bending assembly moves toward the first bending assembly.
[0006] In one embodiment, the first bending assembly includes a first bending member, the second bending assembly includes a second bending member, and the orthographic projection of the first bending member on the second bending member partially overlaps with the second bending member.
[0007] In one embodiment, the first bending member includes a first section and a second section, and the second bending member includes a third section and a fourth section; the first section and the second section intersect, and the second section extends toward the second bending member; the third section and the fourth section intersect, and the third section extends toward the first bending member.
[0008] In one embodiment, the first bending assembly further includes a first driving member, and the first driving member is connected to the first bending member; the second bending assembly further includes a second driving member, and the second driving member is connected to the second bending member.
[0009] In one embodiment, the bending device includes a first fixed plate and a second fixed plate; the first fixed plate and the second fixed plate are arranged opposite to each other; the clamping assembly, the first bending assembly and the second bending assembly are placed between the first fixed plate and the second fixed plate; the first bending assembly is connected to the first fixed plate, and the second bending assembly is connected to the second fixed plate.
[0010] In one embodiment, the minimum distance H1 between the orthographic projection of the first bending part on the second fixing plate and the orthographic projection of the battery cell on the second fixing plate, and the minimum distance H2 between the orthographic projection of the second bending part on the second fixing plate and the orthographic projection of the battery cell on the second fixing plate satisfy: H1>H2.
[0011] In one embodiment, the clamping assembly includes a fixing member, a third driving member and a clamping member, wherein the third driving member is connected to the fixing member, and the third driving member drives the fixing member to move toward the clamping member.
[0012] In one embodiment, the fixing member includes a fifth section and a sixth section; the fifth section and the sixth section intersect, and the sixth section extends toward the clamping member.
[0013] In one embodiment, at least part of the pole ear is placed between the sixth section and the clamping member; the length H3 of the clamping member facing the fixing member and the length H4 of the battery cell satisfy: H3>H4.
[0014] In one embodiment, a groove is formed on a surface of the clamping member facing the fixing member, and the battery core is accommodated in the groove.
[0015] The utility model provides a bending device suitable for bending the pole ear of a battery cell. The bending device includes a clamping assembly, a first bending assembly and a second bending assembly. The clamping assembly is used to clamp the battery cell. The first bending assembly and the second bending assembly are arranged at a relative interval. The pole ear is placed between the first bending assembly and the second bending assembly. The first bending assembly moves toward the second bending assembly, and the second bending assembly moves toward the first bending assembly. Through the above arrangement, the first bending assembly and the second bending assembly bend the pole ear respectively, reduce the length of the pole ear, thereby reducing the space required for the battery cell and improving the overall space utilization of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1 is a schematic diagram of a bending device according to an embodiment;
[0018] Figure 2 is a schematic diagram of a tab after bending in one embodiment;
[0019] Figure 3 is a schematic diagram of a first bending assembly and a second bending assembly bending a tab in an embodiment;
[0020] Figure 4 is a schematic diagram of a bending process of an embodiment.
[0021] Description of reference numerals:
[0022] 1-first bending assembly, 11-first bending member, 111-first section, 112-second section, 12-first driving member;
[0023] 2-second bending assembly, 21-second bending member, 211-third section, 212-fourth section, 22-second driving member;
[0024] 3-clamping assembly, 31-fixing member, 311-fifth section, 312-sixth section, 32-third driving member, 33-clamping member;
[0025] 4-Pole ear;
[0026] 5- first fixing plate;
[0027] 6- second fixing plate;
[0028] A-the contact point between the second bending component and the tab;
[0029] B-The contact point between the first bending component and the tab. DETAILED DESCRIPTION
[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0031] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.
[0032] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this application includes any and all combinations of one or more of the related listed items.
[0033] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.
[0034] The utility model provides a bending device, please refer to Figure 1 , suitable for bending the pole ear 4 of the battery cell, the bending device includes a clamping component 3, a first bending component 1 and a second bending component 2, the clamping component 3 is used to clamp the battery cell; the first bending component 1 and the second bending component 2 are arranged at a relative interval, the pole ear 4 is placed between the first bending component 1 and the second bending component 2, and the first bending component 1 moves toward the second bending component 2, and the second bending component 2 moves toward the first bending component 1.
[0035] After the tab 4 is welded to the battery cell, the tab 4 will occupy a large installation space, resulting in low space utilization of the battery cell. The bending device bends the tab 4 to reduce the length of the tab 4, thereby reducing the overall height of the battery cell and improving the space utilization of the battery cell.
[0036] The clamping assembly 3 is provided to ensure that the battery cell is fixed in an appropriate position during the bending process of the pole tab 4, to prevent position deviation caused by movement or vibration, and to ensure that the pole tab 4 is bent in the correct position, thereby ensuring the accuracy and repeatability of the bending process.
[0037] A first bending assembly 1 and a second bending assembly 2 are provided, the first bending assembly 1 and the second bending assembly 2 are arranged at a relative interval, the pole lug 4 is placed between the first bending assembly 1 and the second bending assembly 2, the first bending assembly 1 moves toward the second bending assembly 2, and the second bending assembly 2 moves toward the first bending assembly 1. The first bending assembly 1 and the second bending assembly 2 are used to perform bending operations at different positions of the pole lug 4. By bending in steps, the bending degree and shape of the pole lug 4 can be more accurately controlled to avoid excessive bending of the pole lug 4 in one-time forming and resulting in damage. The first bending assembly 1 and the second bending assembly 2 apply forces to the pole lug 4 in opposite directions respectively, so that the pole lug 4 can be bent in one direction first and then in another direction, thereby forming a desired shape.
[0038] In this implementation, please refer to Figure 1 , the clamping assembly 3 clamps the battery cell, the second bending assembly 2 moves toward the first bending assembly 1, moves until it is flush with the lower surface of the pole ear 4, the second bending assembly 2 stops moving, and the second bending assembly 2 supports part of the pole ear 4. Then the first bending assembly 1 moves toward the second bending assembly 2, bends the pole ear 4 90° toward the second bending assembly 2, and the first bending assembly 1 moves away from the second bending assembly 2 and retracts. The second bending assembly 2 continues to move toward the first bending assembly 1, bends the pole ear 4 90° toward the first bending assembly 1, and the second bending assembly 2 is retracted. Please refer to Figure 2 The bent pole ear 4 can reduce its length, effectively releasing the space of the electrical appliance, reducing the volume of the battery cell, and improving the space utilization rate.
[0039] The utility model provides a bending device, which is suitable for bending the pole ear 4 of a battery cell. The bending device includes a clamping assembly 3, a first bending assembly 1 and a second bending assembly 2. The clamping assembly 3 is used to clamp the battery cell. The first bending assembly 1 and the second bending assembly 2 are arranged at a relative interval. The pole ear 4 is placed between the first bending assembly 1 and the second bending assembly 2. The first bending assembly 1 moves toward the second bending assembly 2, and the second bending assembly 2 moves toward the first bending assembly 1. Through the above arrangement, the first bending assembly 1 and the second bending assembly 2 bend the pole ear 4 in steps respectively to prevent the pole ear 4 from being damaged when being bent. By bending the pole ear 4, the length of the pole ear 4 is reduced, thereby reducing the space required for the battery cell and improving the overall space utilization of the battery cell.
[0040] In one implementation, please refer to Figure 1 The first bending assembly 1 includes a first bending member 11 , the second bending assembly 2 includes a second bending member 21 , and the orthographic projection of the first bending member 11 on the second bending member 21 partially overlaps with the second bending member 21 .
[0041] When the first bending component 1 moves toward the second bending component 2, the first bending piece 11 contacts the pole ear 4, squeezes the pole ear 4 so that the pole ear 4 is deformed and bent toward the second bending component 2; when the second bending component 2 moves toward the first bending component 1, the second bending piece 21 contacts the pole ear 4, squeezes the pole ear 4 so that the pole ear 4 is deformed and bent toward the first bending component 1; the orthographic projection of the first bending piece 11 on the second bending piece 21 partially overlaps with the second bending piece 21 to ensure that the first bending piece 11 and the second bending piece 21 can be bent at different positions of the pole ear 4.
[0042] In one embodiment, please refer to Figure 1-Figure 4 The second bending component 2 moves toward the first bending component 1, the second bending member 21 moves to be flush with the lower surface of the pole ear 4, the second bending component 2 stops moving, and the second bending member 21 supports the Figure 3 At point A of the pole lug 4. Then the first bending component 1 moves toward the second bending component 2, and the first bending member 11 bends the pole lug 4 90° at point B toward the second bending component 2. The second bending component 2 continues to move toward the first bending component 1, and the second bending member 21 bends the pole lug 4 90° toward the first bending component 1. By partially overlapping the orthographic projection of the first bending member 11 on the second bending member 21 with the second bending member 21, it is ensured that the first bending member 11 bends the pole lug 4 at point B, and the second bending member 21 bends the pole lug 4 at point A; thereby forming a pole lug 4 with a bent structure, reducing the length of the pole lug 4, thereby reducing the space required for the battery cell and improving the overall space utilization; at the same time, the pole lug 4 is bent in steps to prevent the pole lug 4 from falling off and causing the battery cell to fail.
[0043] In one implementation, please refer to Figure 1 The first bending member 11 includes a first section 111 and a second section 112, and the second bending member 21 includes a third section 211 and a fourth section 212; the first section 111 and the second section 112 intersect, and the second section 112 extends toward the second bending member 21; the third section 211 and the fourth section 212 intersect, and the third section 211 extends toward the first bending member 11.
[0044] The first bending member 11 is composed of a first section 111 and a second section 112. The first section 111 is used as the main support structure to maintain the stable position of the first bending member 11 during the bending process. The second section 112 extends toward the second bending member 21. During the bending process, the second section 112 directly contacts the pole lug 4, applies force to the pole lug 4, and causes the pole lug 4 to bend and deform. The second bending member 21 is composed of a third section 211 and a fourth section 212. The fourth section 212 is used as the main support structure to maintain the stable position of the second bending member 21 during the bending process. The third section 211 extends toward the first bending member 11. During the bending process, the third section 211 directly contacts the pole lug 4, applies force to the pole lug 4, and causes the pole lug 4 to bend and deform.
[0045] In one embodiment, the first bending assembly 1 further includes a first driving member 12 , which is connected to the first bending member 11 ; the second bending assembly 2 further includes a second driving member 22 , which is connected to the second bending member 21 .
[0046] The first driving member 12 and the second driving member 22 serve as power sources for the first bending member 11 and the second bending member 21 respectively, so that the first bending member 11 moves toward the second bending component 2, and the second bending member 21 moves toward the first bending component 1; the first driving member 12 can drive the first bending member 11 to reciprocate toward the second driving component; the second driving member 22 can drive the second bending member 21 to reciprocate toward the first driving component; the first driving member 12 and the second driving member 22 drive the first bending member 11 and the second bending member 21 to move, so that the pole ear 4 is bent.
[0047] The second driving member 22 drives to output power, so that the second bending member 21 moves toward the first bending assembly 1; the second bending member 21 moves to be flush with the lower surface of the pole lug 4, and the second driving member 22 stops driving to output power. The first driving member 12 drives to output power, so that the first bending member 11 moves toward the second bending assembly 2, and the first bending member 11 bends the pole lug 4 90° toward the second bending assembly 2; the first driving member 12 continues to output power, so that the first bending member 11 is retracted. The second driving member 22 starts to drive to output power, so that the second bending member 21 moves toward the first bending assembly 1, and the second bending member 21 bends the pole lug 4 90° toward the first bending assembly 1; the second driving member 22 continues to output power, so that the second bending member 21 is retracted.
[0048] The first driving member 12 and the second driving member 22 can be but not limited to motors, hydraulic cylinders and air cylinders. The first driving member 12 is connected to the first bending member 11 and the second driving member 22 is connected to the second bending member 21 by bolt connection, welding, snap connection and bonding.
[0049] In one embodiment, the bending device includes a first fixed plate 5 and a second fixed plate 6; the first fixed plate 5 and the second fixed plate 6 are arranged opposite to each other; the clamping assembly 3, the first bending assembly 1 and the second bending assembly 2 are placed between the first fixed plate 5 and the second fixed plate 6; the first bending assembly 1 is connected to the first fixed plate 5, and the second bending assembly 2 is connected to the second fixed plate 6.
[0050] The first fixed plate 5 and the second fixed plate 6 are arranged opposite to each other, providing a stable frame to ensure that the clamping assembly 3, the first bending assembly 1 and the second bending assembly 2 remain fixed and balanced during operation, reducing the failure of the bending device due to equipment movement or vibration; the clamping assembly 3, the first bending assembly 1 and the second bending assembly 2 are placed between the first fixed plate 5 and the second fixed plate 6 to accurately position them so that the clamping assembly 3, the first bending assembly 1 and the second bending assembly 2 can work together. The first bending assembly 1 is connected to the first fixed plate 5, so that the first bending assembly 1 can maintain its position stable when the pole ear 4 is bent; the second bending assembly 2 is connected to the second fixed plate 6, so that the second bending assembly 2 can maintain its position stable when the pole ear 4 is bent.
[0051] The first fixing plate 5 and the second fixing plate 6 are arranged opposite to each other, wherein, optionally, the first fixing plate 5 and the second fixing plate 6 are arranged in parallel; the distance between the first fixing plate 5 and the second fixing plate 6 is set according to the required sizes of the clamping assembly 3, the first bending assembly 1 and the second bending assembly 2, so that the clamping assembly 3, the first bending assembly 1 and the second bending assembly 2 can be installed between the first fixing plate 5 and the second fixing plate 6. The connection method of the first bending assembly 1 connecting the first fixing plate 5 and the second bending assembly 2 connecting the second fixing plate 6 can be bolt connection, welding, snap connection and bonding.
[0052] In one embodiment, the minimum distance H1 between the orthographic projection of the first bending member 11 on the second fixed plate 6 and the orthographic projection of the battery cell on the second fixed plate 6, and the minimum distance H2 between the orthographic projection of the second bending member 21 on the second fixed plate 6 and the orthographic projection of the battery cell on the second fixed plate 6, satisfy: H1>H2.
[0053] The minimum distance H1 between the orthographic projection of the first bending member 11 on the second fixing plate 6 and the orthographic projection of the battery cell on the second fixing plate 6 is greater than the minimum distance H2 between the orthographic projection of the second bending member 21 on the second fixing plate 6 and the orthographic projection of the battery cell on the second fixing plate 6. By the above arrangement, the position where the second bending member 21 and the tab 4 are bent is closer to the battery cell than the position where the first bending member 11 and the tab 4 are bent, so that the second bending member 21 is against the tab 4. Figure 3At point A of the pole ear 4, the first bending piece 11 bends the pole ear 4 90° at point B toward the second bending component 2, and the second bending piece 21 bends the pole ear 4 90° toward the first bending component 1, ensuring that the first bending piece 11 bends the pole ear 4 at B, and the second bending piece 21 bends the pole ear 4 at A; the pole ear 4 with a bent structure is formed, the length of the pole ear 4 is reduced, thereby reducing the space required for the battery cell and improving the overall space utilization.
[0054] In one implementation, please refer to Figure 1 The clamping assembly 3 includes a fixing member 31 , a third driving member 32 and a clamping member 33 . The third driving member 32 is connected to the fixing member 31 , and the third driving member 32 drives the fixing member 31 to move toward the clamping member 33 .
[0055] A fixing member 31 and a clamping member 33 are provided so that the fixing member 31 and the clamping member 33 cooperate with each other to constrain the position of the battery cell when the pole tab 4 is bent, thereby maintaining the stability of the battery cell; ensuring that during the bending process of the pole tab 4, the battery cell is fixed in an appropriate position to prevent position deviation due to movement or vibration, and ensuring that the pole tab 4 is bent at the correct position, thereby ensuring the accuracy and repeatability of the bending process.
[0056] When the pole ear 4 is bent, the battery cell is connected to the clamping member 33, and the clamping member 33 clamps the battery cell to fix the position of the battery cell to prevent the battery cell from moving or vibrating during the bending process, thereby ensuring that the pole ear 4 is bent at the correct position and avoiding damage to the pole ear 4 or uneven bending due to position deviation. The third driving member 32 drives the fixing member 31 to move toward the clamping member 33, so that the fixing member 31 contacts the battery cell, so that the fixing member 31 fixes the battery cell, and the clamping member 33 better clamps the battery cell. Through the coordinated work of the fixing member 31 and the clamping member 33, the stability of the battery cell during the bending process is ensured, and a better fixing effect is achieved, thereby ensuring that the pole ear 4 is bent at the correct position. After the bending device completes the bending process of the pole ear 4, the third driving member 32 drives the fixing member 31 to move in the opposite direction, the fixing member 31 is released, the clamping member 33 is released, and the clamping assembly 3 releases the clamping effect on the battery cell.
[0057] The third driving member 32 may be a motor, a hydraulic cylinder or a gas cylinder. The third driving member 32 may be connected to the fixing member 31 by bolt connection, welding, snap connection or bonding.
[0058] In one implementation, please refer to Figure 1 The fixing member 31 includes a fifth section 311 and a sixth section 312 ; the fifth section 311 and the sixth section 312 intersect, and the sixth section 312 extends toward the clamping member 33 .
[0059] The fixing member 31 is composed of the intersecting fifth section 311 and sixth section 312. The fifth section 311 serves as the main supporting structure to maintain the stable position of the fixing member 31 during the process of clamping and fixing the battery cell. The sixth section 312 extends toward the clamping member 33 so that the sixth section 312 contacts the battery cell, thereby achieving the fixing effect of the fixing member 31 on the battery cell. During the process of fixing the battery cell, the third driving member 32 drives the fixing member 31 to move toward the clamping member 33, and the sixth section 312 contacts the battery cell, thereby fixing the battery cell and achieving the clamping effect on the battery cell.
[0060] In one implementation, please refer to Figure 1 , at least part of the pole ear 4 is placed between the sixth section 312 and the clamping member 33; the length H3 of the clamping member 33 facing the fixing member 31 and the length H4 of the battery cell satisfy: H3>H4.
[0061] The length H3 of the clamping member 33 facing the fixing member 31 is greater than the length H4 of the battery cell. By setting the size of the clamping member 33 to be greater than the length of the battery cell, part of the pole lug 4 of the battery cell is on the clamping member 33. When the pole lug 4 is bent, the battery cell is connected to the clamping member 33, and part of the pole lug 4 of the battery cell is also set on the side of the clamping member 33 facing the fixing member 31, and the remaining part is bent. Part of the pole lug 4 set on the clamping member 33 is clamped by the sixth section 312 and the clamping member 33. The sixth section 312 contacts the pole lug 4 instead of the battery cell body. Through direct contact with the pole lug 4, the sixth section 312 can increase the direct pressure on the pole lug 4, provide additional support, and prevent the pole lug 4 from falling off or being damaged due to excessive force during the bending process, thereby protecting the integrity of the pole lug 4 and preventing the low yield rate of the battery cell due to the falling of the pole lug 4.
[0062] In one embodiment, a groove is formed on a surface of the clamping member 33 facing the fixing member 31 , and the battery cell is accommodated in the groove.
[0063] A groove is provided on the side of the clamping member 33 facing the fixing member 31, which can provide a fixed space for the battery cell so that the battery cell can be accommodated in the groove, ensuring that the battery cell remains stable during the bending process. The edge of the groove can tightly surround the battery cell to prevent the battery cell from moving during operation. During the bending process of the pole lug 4, the battery cell is fixed in an appropriate position to prevent position deviation caused by movement or vibration, and ensure that the pole lug 4 is bent in the correct position, thereby ensuring the accuracy and repeatability of the bending process.
[0064] In the description of the embodiments of the present application, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0065] What is disclosed above is only a preferred embodiment of the present application, and it certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiment and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.
Claims
1. A bending device, characterized in that: Suitable for bending a pole ear of a battery cell, the bending device includes a clamping assembly, a first bending assembly and a second bending assembly, the clamping assembly is used to clamp the battery cell; the first bending assembly and the second bending assembly are arranged at a relative interval, the pole ear is placed between the first bending assembly and the second bending assembly, and the first bending assembly moves toward the second bending assembly, and the second bending assembly moves toward the first bending assembly.
2. The bending device according to claim 1, characterized in that: The first bending assembly includes a first bending member, the second bending assembly includes a second bending member, and the orthographic projection of the first bending member on the second bending member partially overlaps with the second bending member.
3. The bending device according to claim 2, characterized in that: The first bending member includes a first section and a second section, and the second bending member includes a third section and a fourth section; the first section and the second section intersect, and the second section extends toward the second bending member; the third section and the fourth section intersect, and the third section extends toward the first bending member.
4. The bending device according to claim 2, characterized in that: The first bending assembly further includes a first driving member connected to the first bending member; the second bending assembly further includes a second driving member connected to the second bending member.
5. The bending device according to claim 2, characterized in that: The bending device includes a first fixed plate and a second fixed plate; the first fixed plate and the second fixed plate are arranged opposite to each other; the clamping assembly, the first bending assembly and the second bending assembly are placed between the first fixed plate and the second fixed plate; the first bending assembly is connected to the first fixed plate, and the second bending assembly is connected to the second fixed plate.
6. The bending device according to claim 5, characterized in that: The minimum distance H1 between the orthographic projection of the first bending part on the second fixing plate and the orthographic projection of the battery cell on the second fixing plate, and the minimum distance H2 between the orthographic projection of the second bending part on the second fixing plate and the orthographic projection of the battery cell on the second fixing plate satisfy: H1>H2.
7. The bending device according to claim 1, characterized in that: The clamping assembly includes a fixing member, a third driving member and a clamping member. The third driving member is connected to the fixing member, and the third driving member drives the fixing member to move toward the clamping member.
8. The bending device according to claim 7, characterized in that: The fixing member includes a fifth section and a sixth section; the fifth section and the sixth section intersect, and the sixth section extends toward the clamping member.
9. The bending device according to claim 8, characterized in that: At least part of the pole ear is placed between the sixth section and the clamping member; the length H3 of the clamping member facing the fixing member and the length H4 of the battery cell satisfy: H3>H4.
10. The bending device according to claim 7, characterized in that: The clamping member is provided with a groove on one side facing the fixing member, and the battery core is accommodated in the groove.