High-rate lithium ion battery cell and tab pressing device

Abstract

The utility model discloses a kind of high rate lithium ion battery electric core and tab press bonding device, belong to lithium electronic battery technical field, the high rate lithium ion battery electric core includes electric core body, the electric core body includes positive electrode layer and negative electrode layer, the tab press bonding device of this high rate lithium ion battery electric core includes base, rotating column is connected and installed in the base upper through drive motor, and rotating column bottom is equipped with transport chassis, the surface of transport chassis is equipped with a plurality of cutting grooves, and electric core body is placed in the surface of transport chassis, the tab press bonding device of this high rate lithium ion battery electric core solves the problem that existing tab press bonding device is inconvenient to take and cannot cut redundant tab, with the advantages of efficient processing and integrated operation, accurate positioning and widely adapted, suitable for the tab press bonding processing of high rate lithium ion battery electric core, help to improve production efficiency and processing quality.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery technology, specifically to a high-rate lithium-ion battery cell and a tab pressing device. Background Technology

[0002] Lithium-ion batteries are widely used in various electronic products and new energy vehicles. They use lithium metal or lithium alloy as the negative electrode material and achieve charging and discharging through the insertion and extraction of lithium ions between the positive and negative electrodes. Compared with traditional batteries, lithium batteries have higher energy density, providing longer-lasting power to devices; longer cycle life, allowing for multiple charge-discharge cycles with slow performance degradation; lower self-discharge rate, resulting in less energy loss during storage; and better environmental friendliness, reducing the use of harmful heavy metals. These advantages have greatly promoted the miniaturization of portable electronic devices and the booming development of the electric vehicle industry. However, existing lithium-ion battery cells and electrode bonding devices still have certain problems in use:

[0003] For example, a high-rate lithium-ion battery cell and tab pressing device with application number 202222079365.0 has the following technical solution: it includes multiple porous positive electrode sheets and porous negative electrode sheets, with positive and negative electrode materials coated on both sides of the positive and negative electrode sheets. In this utility model, not only can the electrolyte be wetted quickly and effectively, but the use of foil materials can also be saved, reducing costs, reducing battery weight, increasing energy density, increasing the optimal compaction density of the electrode sheets, and increasing the battery specific energy and cycle life, thereby achieving high energy, high current and high power output characteristics, and further expanding the application of lithium-ion batteries in large-scale power storage systems. The pressing component can also quickly press multiple tabs. However, the internal structure of the placement box of the existing tab pressing device is not conducive to the quick handling of tabs. Workers need to spend a lot of time searching and grabbing them, which seriously affects production efficiency. After the tabs are pressed, there are often excess parts left. However, the existing device lacks integrated cutting function, and a separate process and equipment need to be arranged for cutting.

[0004] In view of this, in-depth research was conducted on the above issues, which led to the creation of this case.

[0005] To address the aforementioned issues, an innovative design was implemented based on the existing tab pressing device. Utility Model Content

[0006] The purpose of this invention is to provide a high-rate lithium-ion battery cell and a tab pressing device to solve the problems mentioned in the background art, such as the inconvenience of placing and taking materials and the inability to cut off excess tabs.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A high-rate lithium-ion battery cell includes a cell body, which comprises a positive electrode layer and a negative electrode layer. The positive electrode layer is located on the front side of the cell body, and the negative electrode layer is located on the back side of the cell body. Both the positive electrode layer and the negative electrode layer are coated onto the cell body by a coating machine, and the positive electrode layer and the negative electrode layer are wound and pressed onto the surface of the cell body. First tabs are welded to both sides of the positive electrode layer, and second tabs are welded to both sides of the negative electrode layer. The first tabs and the second tabs are pressed together by a tab pressing device to form a pressing structure.

[0009] A high-rate lithium-ion battery cell tab pressing device includes a base, a rotating column connected to the top of the base via a drive motor, and a transport chassis mounted at the bottom of the rotating column. The surface of the transport chassis has several cutting grooves, and the battery cell body is placed on the surface of the transport chassis.

[0010] Preferably, a support rod is installed on the upper left side of the base, and a support frame is fixedly installed on the right side of the support rod. An installation frame is provided above the support frame, and a pneumatic telescopic mechanism is installed in the middle above the installation frame.

[0011] By adopting the above technical solution, the support rod on the upper left side of the base, the fixed support frame on the right side, and the mounting frame set on the support frame provide a stable mounting platform for components such as the pneumatic telescopic mechanism, ensuring the stability of the overall structure of the pressing device and enabling the pressing operation to be carried out more accurately.

[0012] Preferably, a lifting block is connected and installed below the pneumatic telescopic mechanism, and pressing blocks are provided on the lower left and right sides of the bottom of the lifting block. A spring is connected and installed above the pressing block, and a sliding column is provided above the pressing block and slidably connected to the lifting block.

[0013] Using the above technical solution, the lifting block connected below the pneumatic telescopic machine, the pressing block at the bottom, and the spring and slide column connected above the pressing block provide buffering during pressing to prevent excessive pressure from damaging the electrode tabs. The slide column ensures that the pressing block rises and falls stably, making the electrode tabs press more evenly and improving the pressing quality.

[0014] Preferably, a cutting blade is fixedly installed on the outer sides of the bottom left and right sides of the lifting block, and the cutting blade is located directly above the cutting groove.

[0015] Using the above technical solution, the cutting blade at the bottom of the lifting block cooperates with the cutting groove on the transport chassis. After the electrode tabs are pressed together, the excess electrode tabs can be cut directly without additional processes and equipment, saving time and costs and improving production efficiency.

[0016] Preferably, a servo motor is fixedly installed on the left side of the support frame, and a rotating rod is connected and installed on the right output end of the servo motor. The right end of the rotating rod is rotatably connected to the right side of the inside of the support frame, and pulley sets are connected and installed on the lower left and right sides of the rotating rod.

[0017] Using the above technical solution, the servo motor on the left side of the support frame and its connected rotating rod and pulley assembly provide power to the entire transmission structure. The power is transmitted to the threaded rod through the pulley assembly, thereby achieving precise control of the positioning plate position and facilitating the positioning of battery cells of different sizes.

[0018] Preferably, each of the pulley sets has a threaded rod connected to its lower end, and the thread directions of the two threaded rods on the left and right sides are opposite. Each threaded rod is threadedly connected to a threaded sleeve near the middle of the support frame, and the bottom of the threaded sleeve is slidably connected to a sliding groove on the bottom surface of the support frame. Furthermore, each threaded sleeve is fixedly installed with a positioning plate near the middle of the support frame.

[0019] By adopting the above technical solution, the threaded rod with opposite left and right thread directions, the threaded sleeve with threaded connection, and the positioning plate fixed on the threaded sleeve can be rotated to make the positioning plates move in opposite directions, so as to accurately adjust the spacing between the positioning plates, adapt to the fixing requirements of battery cell bodies of different sizes, and improve the versatility of the device.

[0020] Compared with the prior art, the beneficial effects of this utility model are: the high-rate lithium-ion battery cell and the electrode tab pressing device,

[0021] 1. High-efficiency processing and integrated operation: The transport chassis is equipped with a cutting blade and a cutting groove. The cutting blade at the bottom of the lifting block cooperates with the cutting groove on the transport chassis. After the electrode tabs are pressed together, the excess electrode tabs can be directly cut. This realizes the integrated operation of electrode tab pressing and excess electrode tab cutting, reduces the number of processes and equipment changes, greatly improves production efficiency, and reduces production costs.

[0022] 2. Precise positioning and wide compatibility: The positioning structure, consisting of a servo motor, rotating rod, pulley assembly, threaded rod, threaded sleeve, and positioning plate, can precisely adjust the position of the positioning plate to adapt to battery cell bodies of different sizes, thus improving the versatility and processing accuracy of the device. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the battery cell body structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the electrode clamping device of this utility model;

[0025] Figure 3 This is a front cross-sectional view of the electrode tab pressing device of this utility model;

[0026] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle;

[0027] Figure 5This is a schematic diagram of the transport chassis structure of this utility model.

[0028] In the diagram: 1. Battery cell body; 2. Positive electrode layer; 3. Negative electrode layer; 4. First electrode tab; 5. Second electrode tab; 6. Base; 7. Transport chassis; 8. Rotary column; 9. Cutting groove; 10. Support rod; 11. Support frame; 12. Mounting frame; 13. Pneumatic telescopic mechanism; 14. Lifting block; 15. Pressing block; 16. Spring; 17. Cutting blade; 18. Servo motor; 19. Rotary rod; 20. Pulley assembly; 21. Threaded rod; 22. Threaded sleeve; 23. Positioning plate. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figures 1-5 This utility model provides a technical solution:

[0031] A high-rate lithium-ion battery cell includes a cell body 1, which comprises a positive electrode layer 2 and a negative electrode layer 3. The positive electrode layer 2 is located on the front side of the cell body 1, and the negative electrode layer 3 is located on the back side of the cell body 1. Both the positive electrode layer 2 and the negative electrode layer 3 are coated onto the cell body 1 by a coating machine, and are also wound and pressed onto the surface of the cell body 1. The positive electrode layer 2 has a first tab 4 welded on both sides, and the negative electrode layer 3 has a second tab 5 welded on both sides. The first tabs 4 and the second tabs 5 are pressed together by a tab pressing device to form a pressing structure.

[0032] A high-rate lithium-ion battery cell tab pressing device includes a base 6, a rotating column 8 connected to the top of the base 6 via a drive motor, and a transport chassis 7 mounted at the bottom of the rotating column 8. The surface of the transport chassis 7 has several cutting grooves 9, and the battery cell body 1 is placed on the surface of the transport chassis 7. A lifting block 14 is connected and installed below a pneumatic telescopic mechanism 13, and pressing blocks 15 are located on the lower left and right sides of the bottom of the lifting block 14. A spring 16 is connected and installed above the pressing block 15, and a sliding column is slidably connected to the lifting block 14 above the pressing block 15. Cutting blades 17 are fixedly installed on the outer left and right sides of the bottom of the lifting block 14, and the cutting blades 17 are located directly above the cutting grooves 9. A support rod 10 is installed on the upper left side of the base 6, and a support frame 11 is fixedly installed on the right side of the support rod 10. A mounting frame 12 is installed above the support frame 11, and the pneumatic telescopic mechanism 13 is installed in the middle of the upper part of the mounting frame 12. The support rod 10 on the upper left and the support frame 11 fixed to its right, as well as the mounting bracket 12 above the support frame 11, form a stable structure for components such as the pneumatic telescopic mechanism 13, ensuring the stability of these components during operation and preventing the impact of shaking on the electrode clamping accuracy. The lifting block 14 below the pneumatic telescopic mechanism 13, the bottom clamping block 15, and the spring 16 and slide column connected above the clamping block 15 are all designed to buffer the impact force during clamping, preventing excessive pressure from damaging the battery electrode. The slide column ensures the smooth lifting and lowering of the clamping block 15, ensuring the uniformity and stability of the electrode clamping and improving the clamping quality. The cutting blade 17 at the bottom of the lifting block 14 cooperates with the cutting groove 9 on the transport chassis 7, allowing excess electrode to be cut directly after clamping. This integrates the clamping and cutting processes, reducing additional cutting equipment and process changeover time, and greatly improving production efficiency.

[0033] A servo motor 18 is fixedly installed on the left side of the support frame 11, and a rotating rod 19 is connected to the output end of the servo motor 18 on the right side. The right end of the rotating rod 19 is rotatably connected to the right side of the inside of the support frame 11. Pulley sets 20 are connected to the lower sides of both sides of the rotating rod 19. Threaded rods 21 are connected to the lower ends of the pulley sets 20, and the threads of the two threaded rods 21 are opposite in direction. A threaded sleeve 22 is threadedly connected to the middle of each threaded rod 21 near the middle of the support frame 11. The bottom of the threaded sleeve 22 is slidably connected to a groove on the bottom surface of the support frame 11. A positioning plate 23 is fixedly installed to the middle of each threaded sleeve 22 near the middle of the support frame 11. The servo motor 18 on the left side, the connected rotating rod 19, and the pulley group 20 provide stable power. The servo motor 18 transmits power through the pulley group 20, which can precisely drive the threaded rod 21 to rotate, providing a reliable power source for the movement of the positioning plate 23. This enables precise control of the positioning of the battery cell body 1. The threaded rod 21 with opposite thread direction, the threaded sleeve 22 connected to it, and the positioning plate 23 fixed on the threaded sleeve 22 can make the positioning plate 23 move precisely in opposite directions through the rotation of the threaded rod 21. This allows for flexible adjustment according to different sizes of the battery cell body 1, significantly improving the applicability of the device to battery cells of different specifications.

[0034] Working principle:

[0035] In this invention, the battery cell body 1 is placed on the transport chassis 7. The drive motor is started, causing the rotating column 8 to rotate the transport chassis 7, adjusting the position of the electrode tab of the battery cell body 1 below the pressing block 15. The servo motor 18 is started, driving the rotating rod 19 to rotate. The rotating rod 19 drives the threaded rod 21 to rotate through the pulley group 20. Since the threads of the left and right threaded rods 21 are opposite, the threaded sleeve 22 will move towards or away from the threaded rod 21, thereby driving the positioning plate 23 to adjust the spacing and accurately position the battery cell body 1. After positioning, the pneumatic telescopic machine 13 is started, pushing the lifting block 14 down. The pressing block 15 presses the electrode tab under the buffering action of the spring 16. At the same time, the cutting blade 17 cuts off the excess electrode tab, completing the entire electrode tab pressing and cutting process. The transport chassis 7 continues to rotate to process the next battery cell body 1.

[0036] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-rate lithium-ion battery cell, comprising a cell body (1), wherein the cell body (1) includes a positive electrode layer (2) and a negative electrode layer (3), characterized in that: The positive electrode layer (2) is located on the front side of the cell body (1), and the negative electrode layer (3) is located on the back side of the cell body (1). The positive electrode layer (2) and the negative electrode layer (3) are coated on the cell body (1) by a coating machine, and the positive electrode layer (2) and the negative electrode layer (3) are wound and pressed onto the surface of the cell body (1). The positive electrode layer (2) has a first tab (4) welded on both the left and right sides, and the negative electrode layer (3) has a second tab (5) welded on both the left and right sides. The first tab (4) and the second tab (5) are pressed together by a tab pressing device to form a pressing structure.

2. A tab pressing device for a high-rate lithium-ion battery cell, comprising a base (6), characterized in that: A rotating column (8) is connected and installed above the base (6) via a drive motor, and a transport chassis (7) is installed at the bottom of the rotating column (8). Several cutting grooves (9) are opened on the surface of the transport chassis (7), and the battery cell body (1) is placed on the surface of the transport chassis (7).

3. The electrode pressing device for a high-rate lithium-ion battery cell according to claim 2, characterized in that: A support rod (10) is installed on the upper left side of the base (6), and a support frame (11) is fixedly installed on the right side of the support rod (10). An installation frame (12) is provided above the support frame (11), and a pneumatic telescopic machine (13) is installed in the middle above the installation frame (12).

4. The electrode pressing device for a high-rate lithium-ion battery cell according to claim 3, characterized in that: A lifting block (14) is connected and installed below the pneumatic telescopic machine (13), and a pressing block (15) is provided on the lower left and right sides of the bottom of the lifting block (14). A spring (16) is connected and installed above the pressing block (15), and a sliding column is provided above the pressing block (15) and slidably connected to the lifting block (14).

5. The electrode pressing device for a high-rate lithium-ion battery cell according to claim 4, characterized in that: The lifting block (14) has a cutting blade (17) fixedly installed on the outer sides of the bottom left and right sides, and the cutting blade (17) is located directly above the cutting groove (9).

6. The electrode pressing device for a high-rate lithium-ion battery cell according to claim 3, characterized in that: A servo motor (18) is fixedly installed on the left side of the support frame (11), and a rotating rod (19) is connected to the output end of the servo motor (18). The right end of the rotating rod (19) is rotatably connected to the right side of the support frame (11), and pulley sets (20) are connected to the lower left and right sides of the rotating rod (19).

7. The electrode pressing device for a high-rate lithium-ion battery cell according to claim 6, characterized in that: Each of the pulley sets (20) has a threaded rod (21) connected to its lower end. The threaded directions of the two threaded rods (21) are opposite. Each of the threaded rods (21) is threadedly connected to a threaded sleeve (22) near the middle of the support frame (11). The bottom of the threaded sleeve (22) is slidably connected to the sliding groove on the bottom surface of the support frame (11). A positioning plate (23) is fixedly installed on each of the threaded sleeves (22) near the middle of the support frame (11).

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