Bending equipment for lithium battery shell production

Abstract

The utility model relates to the technical field of battery shells, in particular to bending equipment for lithium battery shell production, which comprises a base and a moving frame movably connected to the base, a placing groove is formed in the middle of the base and the moving frame and used for placing a metal shell to be bent, rotating shafts are rotatably connected to two sides of the base, rotating parts are fixedly mounted on the rotating shafts, and the rotating parts are fixedly connected to the moving frame. Movable plates are movably connected to the two sides of the bottom of the base, a frame is fixedly installed in the middle of the bottom face of the base, and elastic bags are arranged between the movable plates and the middle of the frame. The limiting plate is movably connected to the middle position of the movable frame in a symmetrical structure; the lap joint ring sleeves the outer wall of the rotating shaft; and the piston pipe is mounted in the middle of the movable frame. The elastic bag and the lap joint strip are arranged, and the rotating piece is arranged in a matched mode, so that flexible bending of the two ends of the metal shell can be synchronously achieved; and the heating module is arranged in a matched mode, internal stress can be eliminated after bending is completed, and the bending precision is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery casing technology, specifically to bending equipment for the production of lithium battery casings. Background Technology

[0002] Lithium-ion batteries are a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution. To ensure the safety of lithium-ion batteries during use, they are usually encased in a metal casing, which is used to cover multiple neatly arranged lithium-ion batteries for various applications.

[0003] The purpose of the lithium battery casing is to protect and secure the lithium battery. Therefore, the lithium battery casing is usually designed with a U-shaped structure to enclose the lithium battery. However, in the production process, the U-shaped structure is achieved by repeatedly bending a single metal casing with a bending machine. This process is inefficient and can damage the protective coating on the surface of the metal casing. In addition, due to the internal stress of the metal casing, it usually springs back after bending, resulting in low bending accuracy and poor final fixation of the lithium battery. In view of this, we propose a bending machine for the production of lithium battery casings. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, this utility model provides a bending device for lithium battery casing production, which can effectively solve the problems of low processing efficiency and damage to the protective coating on the surface of the metal casing due to the fact that the existing lithium battery casing requires multiple bending with a single metal casing to achieve a U-shaped structure during the production process. Furthermore, due to the internal stress of the metal casing, it usually springs back after bending, resulting in low bending accuracy and poor fixation effect on the lithium battery in the later stage.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model provides a bending device for lithium battery casing production, including a base and a movable frame movably connected to the base. A placement groove is formed in the middle of the base and the movable frame for placing the metal casing to be bent. Rotary shafts are rotatably connected to both sides of the base, and rotating parts are fixedly installed on the rotating shafts. Movable plates are movably connected to both sides of the bottom of the base. A frame is fixedly installed in the middle of the bottom surface of the base. An elastic bladder is provided between the movable plate and the middle of the frame. Electric springs are provided on both sides of the elastic bladder, and the two ends of the electric springs are respectively connected to the outer wall of the movable plate and the outer wall of the frame.

[0007] And a limiting plate that is symmetrically and movably connected to the middle of the moving frame;

[0008] In addition, the overlapping ring sleeved on the outer wall of the rotating shaft, when the rotating shaft is driven by an external motor, the overlapping ring contacts the trigger switch set on the outer wall of the movable plate, so that the energized spring is energized and contracts and squeezes the elastic bladder.

[0009] Additionally, a piston tube is installed in the middle of the movable frame, and a connecting rod is movably connected inside the piston tube. A fixing plate is fixedly installed at the lower end of the connecting rod, and the outer wall of the fixing plate slides in cooperation with the inclined surface opened on the outer wall of the limiting plate.

[0010] Furthermore, a storage cavity is provided in the middle of the frame, which is connected to the interior of two elastic bladders through connecting slots on both sides; the storage cavity is connected to the interior of the piston tube through a connecting pipe, and also includes an installation slot opened on the top surface of the base, in which an overlapping strip is movably connected; when the elastic bladder is compressed, the gas inside it will enter the installation slot and cause the overlapping strip to move upward in the placement slot to support the bent metal shell, while the gas in the elastic bladder will enter the piston tube simultaneously, causing the fixing plate to contact the inclined surface and causing the two limiting plates to move away from each other, thus squeezing the bent part of the metal shell.

[0011] Furthermore, it also includes a guide groove formed on the inner wall of the movable frame, the guide groove being composed of an inclined part and a horizontal part, with the inclined part and the horizontal part being smoothly connected, and a limiting post fixedly installed on the outer wall of the limiting plate, with the limiting post slidingly engaged with the guide groove; when the fixed plate contacts the limiting plate, the limiting post will slide from the inclined part in the guide groove to the horizontal part, and the two limiting plates will first move downward in the vertical direction, and then move towards the bending part of the metal shell to be bent respectively.

[0012] Furthermore, it also includes a heating module for heating the bent portion of the metal shell. The heating module includes a contact switch fixedly installed on the outer wall of the frame and a heating element set on the outer wall of the limiting plate. The heating element is laid on the outer wall of the limiting plate in an inclined structure. When the outer wall of the movable plate contacts the contact switch, the heating element is energized and heated to heat the bent portion of the metal shell.

[0013] Furthermore, it also includes a heat-conducting layer disposed on the outer wall of the rotating component, and the outer edge of the heating element is set as a curved surface.

[0014] The technical solution provided by this utility model has the following beneficial effects:

[0015] This invention, through the provision of elastic bladders and overlapping strips, along with a rotating component, enables simultaneous flexible bending of both ends of the metal shell; furthermore, the addition of a heating module eliminates internal stress after bending, thereby improving bending accuracy. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the bending device of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the mobile frame and the base of this utility model when separated;

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of the base of this utility model;

[0020] Figure 4 This is a schematic diagram of the exploded structure of the movable frame of this utility model;

[0021] Figure 5 This is a schematic diagram of the exploded structure of the base of this utility model.

[0022] The labels in the diagram represent:

[0023] 1. Base; 11. Frame; 111. Storage cavity; 112. Connecting groove; 113. Contact switch; 12. Overlap strip; 13. Connecting pipe;

[0024] 2. Movable frame; 21. Piston tube; 211. Fixing plate; 22. Limiting plate; 221. Limiting post; 222. Inclined surface; 223. Heating element; 23. Guide groove;

[0025] 3. Shaft; 31. Overlapping ring; 32. Rotating component;

[0026] 4. Movable plate; 41. Electric spring; 42. Elastic bladder. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0028] The present invention will be further described below with reference to the embodiments.

[0029] Example: Refer to Appendix Figure 1-5 As shown, the bending equipment for lithium battery casing production includes a base 1 and a movable frame 2 movably connected to the base 1. A placement groove is formed in the middle of the base 1 and the movable frame 2 for placing the metal casing to be bent. Rotating shafts 3 are rotatably connected to both sides of the base 1. Rotating parts 32 are fixedly installed on the rotating shafts 3. Movable plates 4 are movably connected to both sides of the bottom of the base 1. A frame 11 is fixedly installed in the middle of the bottom surface of the base 1. An elastic bladder 42 is provided between the movable plate 4 and the middle of the frame 11. Electric springs 41 are provided on both sides of the elastic bladder 42.

[0030] Specifically, in this application, the lithium battery casing is made of metal. During the actual bending process, the movable frame 2 is first separated from the base 1, and a placement space is formed in the middle of the two, which is the placement groove of the aforementioned volume. The metal casing to be bent is placed inside the placement groove. Correspondingly, during the bending process, the external drive motor drives the set rotating shaft 3 to rotate. In conjunction with the rotating component 32 fixedly installed on the rotating shaft 3, during the rotation, the outer wall of the rotating component 32 will contact the outer wall of the metal casing to be bent, and realize the synchronous bending of the common U-shaped lithium battery casing. Furthermore, a limiting plate 22 is symmetrically connected to the middle position of the movable frame 2. In this application, the limiting plate 22 can restrict the position of the metal casing, thereby ensuring the smooth bending of the metal casing.

[0031] It should be noted that during the actual bending process, the metal casing will deform. It is important to emphasize that, to improve the service life of the metal casing, a protective layer is usually coated on its outer wall. If a certain part of the metal casing is bent rapidly, the corresponding metal coating will flake off, resulting in insufficient protection at that location and thus reducing its service life. The reason for this is that during the bending process, the deformed area of ​​the metal casing is subjected to external hard contact, causing the stress inside the metal coating to not be properly released in a short time. This application also includes a mounting groove on the top surface of the base 1, within which an overlapping strip 12 is movably connected. During the actual bending process, when the metal shell deforms, the middle part of the metal shell will bulge downwards, and the overlapping strip 12 movably connected to the top surface of the base 1 will move downwards accordingly. At this time, the limiting plate 22 set on the moving frame 2 does not directly contact the bending position, thereby reducing damage to the metal coating on the surface of the metal shell. As the bending continues, the limiting plate 22 will gradually approach the bending position, eventually achieving bending. Through this flexible bending method, the damage to the metal coating at the bending part can be effectively reduced, ensuring the protective effect of the shell when fixing the lithium battery. In particular, when the metal coating is a heat-insulating coating, the advantages of this bending method are more obvious.

[0032] Furthermore, in this application, overlapping rings 31 are also fitted on the outer walls of both ends of the rotating shaft 3. When the rotating shaft 3 rotates under the drive of an external motor, the overlapping rings 31 will also rotate synchronously. During this process, the overlapping rings 31 will contact the trigger switch set on the outer wall of the movable plate 4, so that the energized spring 41 is energized and contracts. The two ends of the energized spring 41 are respectively connected to the outer wall of the movable plate 4 and the outer wall of the frame 11. When the energized spring 41 is connected to the external power supply, the corresponding energized spring 41 will contract, and the movable plate 4 will squeeze the elastic bladder 42.

[0033] Furthermore, a piston tube 21 is also provided in the middle of the movable frame 2. A connecting rod is movably connected inside the piston tube 21. A fixing plate 211 is fixedly installed at the lower end of the connecting rod. The outer wall of the fixing plate 211 slides in cooperation with the inclined surface 222 opened on the outer wall of the limiting plate 22. A storage cavity 111 is provided in the middle of the frame 11. The storage cavity 111 is connected to the inside of the piston tube 21 through the connecting pipe 13. When the gas in the storage cavity 111 enters the inside of the piston tube 21, the fixing plate 211 contacts the inclined surface 222, and the two limiting plates 22 move away from each other. That is, the two limiting plates 22 are moved to both sides and squeezed towards the bending position of the metal shell. At the same time, with the support of the rotating part 32, the flexible bending of the metal shell is gradually realized.

[0034] Furthermore, as mentioned above, in the initial stage of bending, the overlapping strip 12 will be squeezed at the middle position of the metal shell by the external force applied by the rotating member 32. However, as bending continues, when the gas in the elastic bladder 42 is compressed, the overlapping strip 12 will also move vertically towards the side closer to the metal shell, thus providing stable support for the metal shell. Specifically, the storage cavity 111 is connected to the inside of the two elastic bladders 42 through the connecting grooves 112 on both sides. The storage cavity 111 is connected to the inside of the piston tube 21 through the connecting pipe 13. When the elastic bladder 42 is compressed, the gas inside it will enter the mounting groove and cause the overlapping strip 12 to move upward in the placement groove to support the metal shell to be bent.

[0035] Furthermore, it also includes a guide groove 23 formed on the inner wall of the movable frame 2. The guide groove 23 consists of an inclined part and a horizontal part, and the inclined part and the horizontal part are smoothly connected. It also includes a limiting post 221 fixedly installed on the outer wall of the limiting plate 22, with the limiting post 221 slidingly engaged with the guide groove 23. When the fixed plate 211 contacts the limiting plate 22, the limiting post 221 slides from the inclined part to the horizontal part within the guide groove 23. The two limiting plates 22 first move downwards in the vertical direction, and then move towards the bending portion of the metal shell to be bent. The main purpose of the guide groove 23 is to guide the movement of the limiting plate 22. The trajectory is effectively limited, and the corresponding inclined part is understood to have a height difference in the vertical direction and is set in a way that tilts to both sides. First, we can know that when the limiting plate 22 is not in contact with the outer wall of the metal shell, the metal shell is in an arc-shaped structure in the placement groove. Through the setting of the inclined part of the guide groove 23, the end of the limiting plate 22 can gradually contact the outer wall of the metal shell, and as the contact continues, the corresponding contact force will gradually increase. In a gradual manner, the damage to the metal coating on the surface of the metal shell during bending is reduced, and the internal stress of the metal shell after bending is reduced, thus reducing springback.

[0036] To reduce the springback of the metal casing under internal stress after bending, in addition to increasing the bending angle, as one implementation method, in this application, when the outer wall of the metal casing contacts the outer wall of the heating element 223, the external drive motor starts to reverse, causing the rotating part 32 to reset. Furthermore, to eliminate the springback effect caused by the internal stress of the metal casing, this application also includes a heating module for heating the bent portion of the metal casing. The heating module includes a contact switch 113 fixedly mounted on the outer wall of the frame 11, and a heating element 223 disposed on the outer wall of the limiting plate 22. 3. The movable plate 4 is laid on the outer wall of the limiting plate 22 in an inclined structure. When the outer wall of the movable plate 4 comes into contact with the contact switch 113, the heating element 223 is energized and heated to heat the bent part of the metal shell. Specifically, after bending is completed, the elastic bladder 42 is in the extreme state of compression. The outer wall of the movable plate 4 will come into contact with the contact switch 113, so that the heating element 223, which is set on the outer wall of the limiting plate 22 and is in an inclined state, is connected to the power supply and then heats the bent part of the metal shell. In this way, the internal stress at the bent position of the metal shell is eliminated, and the bending effect of the metal shell is guaranteed.

[0037] Furthermore, to ensure the heating effect, a heat-conducting layer is also provided on the outer wall of the rotating part 32. The outer edge of the heating element 223 is set as a curved surface. The lithium battery shell is usually made of metal, which has good thermal conductivity. Together with the heat-conducting layer provided on the outer wall of the rotating part 32, the heating effect on the bent part of the metal shell can be guaranteed. The curved surface provided on the outer edge of the heating element 223 can reduce the damage to the outer wall of the metal shell caused by the limiting plate 22 during movement.

[0038] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A bending device for lithium battery casing production, characterized in that, include: A base (1) and a movable frame (2) movably connected to the base (1). A placement groove is formed in the middle of the base (1) and the movable frame (2) for placing the metal shell to be bent. A rotating shaft (3) is rotatably connected to both sides of the base (1). A rotating part (32) is fixedly installed on the rotating shaft (3). A movable plate (4) is movably connected to both sides of the bottom of the base (1). A frame (11) is fixedly installed in the middle of the bottom surface of the base (1). An elastic bladder (42) is provided between the movable plate (4) and the middle of the frame (11). An electric spring (41) is provided on both sides of the elastic bladder (42). The two ends of the electric spring (41) are connected to the outer wall of the movable plate (4) and the outer wall of the frame (11) respectively. And, a limiting plate (22) that is symmetrically connected to the middle of the movable frame (2); In addition, the overlapping ring (31) sleeved on the outer wall of the rotating shaft (3) will contact the trigger switch set on the outer wall of the movable plate (4) when the rotating shaft (3) is driven by an external motor, so that the energized spring (41) is energized and contracts and squeezes the elastic bladder (42). In addition, a piston tube (21) is installed in the middle of the movable frame (2), a connecting rod is movably connected inside the piston tube (21), and a fixing plate (211) is fixedly installed at the lower end of the connecting rod. The outer wall of the fixing plate (211) slides in cooperation with the inclined surface (222) opened on the outer wall of the limiting plate (22).

2. The bending equipment for lithium battery casing production according to claim 1, characterized in that, A storage cavity (111) is provided in the middle of the frame (11), and the storage cavity (111) is connected to the interior of two elastic bladders (42) through connecting grooves (112) on both sides respectively; The storage cavity (111) is connected to the inside of the piston tube (21) through the connecting pipe (13), and also includes a mounting groove opened on the top surface of the base (1), with an overlapping strip (12) movably connected in the mounting groove. When the elastic bladder (42) is compressed, the gas inside it enters the mounting groove and causes the overlapping strip (12) to move upward in the placement groove to support the bent metal shell. At the same time, the gas in the elastic bladder (42) enters the piston tube (21) and causes the fixing plate (211) to contact the inclined surface (222), and causes the two limiting plates (22) to move away from each other, squeezing the bent part of the bent metal shell.

3. The bending equipment for lithium battery casing production according to claim 2, characterized in that, It also includes a guide groove (23) opened on the inner wall of the movable frame (2), the guide groove (23) is composed of an inclined part and a horizontal part, and the inclined part and the horizontal part are smoothly connected, and a limiting post (221) fixedly installed on the outer wall of the limiting plate (22), the limiting post (221) and the guide groove (23) are in sliding fit; When the fixing plate (211) comes into contact with the limiting plate (22), the limiting post (221) will slide from the inclined part in the guide groove (23) to the horizontal part. The two limiting plates (22) will first move downward in the vertical direction, and then move towards the bending part of the metal shell to be bent.

4. The bending equipment for lithium battery casing production according to claim 1, characterized in that, It also includes a heating module for heating the bent parts of the metal shell. The heating module includes a contact switch (113) fixedly installed on the outer wall of the frame (11) and a heating element (223) set on the outer wall of the limiting plate (22). The heating element (223) is laid on the outer wall of the limiting plate (22) in an inclined structure. When the outer wall of the movable plate (4) comes into contact with the contact switch (113), the heating element (223) is energized and heated to heat the bent part of the metal shell.

5. The bending equipment for lithium battery casing production according to claim 4, characterized in that, It also includes a heat-conducting layer disposed on the outer wall of the rotating part (32), and the outer edge of the heating element (223) is set as a curved surface.

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