Cylinder cell covering method

Abstract

The present disclosure provides a cylindrical battery cell covering method, based on cover plate shaping, tab bending, tab bending detection, cover plate correction, cover plate correction detection, cover plate alignment, cover plate alignment detection, and cylindrical battery cell covering, which solves the technical problems of high failure rate in the cylindrical battery cell covering process, cover plate deformation and jamming, and high equipment failure rate, improves the assembly precision and yield of the cylindrical battery cell covering, significantly improves the production efficiency, and reduces the production cost.

Description

Technical Field

[0001] This disclosure relates to the field of power batteries, specifically to a method for sealing cylindrical battery cells. Background Technology

[0002] As a new type of functional battery, power lithium batteries have advantages such as high energy density, high battery voltage, wide operating temperature range, and long storage life, and have been widely used in new energy vehicles and communication base stations. The existing cylindrical battery manufacturing process requires a capping operation and a spot welding operation. The capping operation involves aligning the ends of the cap plate and the cylindrical body, then inserting the cap plate into the cylindrical body to seal the opening. The spot welding operation involves welding the connection between the cap plate and the cylindrical body.

[0003] Traditional methods typically involve manual assembly and spot welding at two separate workstations, resulting in low assembly accuracy and efficiency, and high production costs.

[0004] Existing technologies include the use of mechanical devices for pre-spot welding of battery cell caps. Patent application CN112756939A discloses a cylindrical battery cap-closing spot welding mechanism, which includes a spot welding device, a cap alignment device, and a cap-closing pushing device. The cap alignment device is used to adjust the relative position between the cylinder and the cap so that the center of the cylinder is aligned with the center of the cap. The cap-closing pushing device is located on the side of the cylinder and is used to push the cap into the cylinder. The spot welding device is located on one side of the cap alignment device. The cap alignment device has a clearance notch facing the open end of the cylinder. The clearance notch is used for the laser emitted by the spot welding device to pass through. The spot welding device is used to perform welding operations on the connection between the cylinder and the cap. The cylinder cover alignment device includes two opposing clamping claw assemblies. Each clamping claw assembly includes a fixed plate, a clamping drive component, and multiple clamping claw blocks. The clamping drive component is disposed on the fixed plate, and an alignment area is provided on the side of the clamping drive component away from the fixed plate. The alignment area is used to accommodate the cylinder and the cover plate. The multiple clamping claw blocks are all connected to the clamping drive component and are arranged around the alignment area. The clamping drive component is used to drive each clamping claw block to move closer to the alignment area so as to abut against the cylindrical surface of the cylinder and the cylindrical surface of the cover plate.

[0005] Patent application CN113182685A discloses a spot welding mechanism for a cylindrical battery case cover, comprising a pre-case cover assembly, a case cover assembly, a coaxiality adjustment assembly, a battery transfer assembly, and a laser spot welding assembly. The battery transfer assembly passes sequentially through the pre-case cover assembly, the case cover assembly, and the laser spot welding assembly. The coaxiality adjustment assembly is located on both sides of the battery transfer assembly. The pre-case cover assembly includes a first positioning component, a first striking component, and a first three-claw positioning component. The case cover assembly includes a second positioning component, a second striking component, and a second three-claw positioning component. The bottoms of the first and second three-claw positioning components, located on the same side, are mounted on the same coaxiality adjustment assembly. This invention also discloses a method for using the spot welding mechanism for a cylindrical battery case cover. This invention ensures a high pass rate for the case cover by positioning, preliminary shaping, and striking the cover plate and aluminum shell; it can automatically complete battery transfer, battery closing, and laser spot welding, significantly improving production efficiency.

[0006] The aforementioned existing technical solution uses grippers to abut or position the cylindrical surfaces of the cylinder and the cover plate. Due to the high precision requirements of the cover assembly and the inability to be fast, the equipment efficiency is low. At the same time, the success rate of cover assembly is low, and it is easy to damage the battery and the mechanism.

[0007] Patent application CN111477897A discloses an automated assembly production line for aluminum-cased cylindrical lithium batteries, including an assembly conveyor line. The assembly conveyor line is sequentially equipped with a tab flattening station, an adhesive application station, a casing insertion station, a tab welding station, a cap pre-spot welding station, and a peripheral welding station. A first positive / negative electrode identification machine, a first code reading mechanism, and a first NG sorting unit are provided at the feeding end of one side of the tab flattening station. The tab flattening station, adhesive application station, casing insertion station, tab welding station, cap pre-spot welding station, and peripheral welding station are all connected by a transfer machine. A feeding conveyor belt is provided at the feeding end of the assembly conveyor line. The cap pre-spot welding station is sequentially equipped with a pre-capping shaping unit, a cap alignment unit, and a cap clamping unit. A pre-spot welding unit is provided at the discharge end of the cap clamping unit, and a fifth NG sorting unit is provided at one end of the pre-spot welding unit.

[0008] The existing technical solution described above involves initial shaping, alignment, and compression before closing the cover. However, during the closing process, the electrode connecting the cover plate and the cylinder is made of aluminum, which is relatively soft and easily deformed. Performing only one initial shaping cannot meet the assembly accuracy requirements of the cover plate and the cylinder during the closing process. The mechanism cannot achieve the required accuracy, which often leads to the equipment jamming during closing. This results in a high equipment failure rate, difficult maintenance after jamming, and easy damage to the battery cells.

[0009] Patent application CN112038704A discloses an automated assembly process for a cylindrical lithium-ion battery with multiple tabs, comprising the following steps in sequence: flattening, coating, casing, current collector welding, capping, peripheral welding, and helium testing. The capping step involves bending and pressing the current collector and cap at a predetermined angle to tightly bond them to the casing, i.e., pre-capping. After pre-capping, the battery cell is transferred to the next station for secondary capping, followed by pre-spot welding for shaping.

[0010] Patent application CN110492165A discloses a method for closing a battery cell, including a bending mechanism, an alignment mechanism, a primary closing mechanism, a secondary closing mechanism, and a pre-spot welding mechanism arranged sequentially along the transmission direction of the battery cell. The specific steps are as follows: S10, the bending mechanism bends the tabs at both ends of the battery cell so that the cover plate connected to the tabs faces the end of the battery cell; S20, the alignment mechanism aligns the cover plate with the battery cell housing; S30, the primary closing mechanism moves the cover plate closer to the housing, and the secondary closing mechanism brings the cover plate into contact with the housing; S40, the pre-spot welding mechanism welds the cover plate to the housing.

[0011] The aforementioned existing technical solutions involve two cap-closing processes. In patent application CN112038704A, the pre-capping process only involves bending the cap plate at a predetermined angle before pressing it shut. Because the electrode connecting the cap plate and the cylinder is made of aluminum, a soft and easily deformed material, bending alone cannot meet the assembly precision requirements of the cap and cylinder during the cap-closing process. Insufficient process precision will still lead to cap-closing failure, cap plate deformation and jamming, and a high equipment failure rate. Patent application CN110492165A involves a first and second cap-closing process after alignment, totaling two cap-closing steps. During this process, the center of the cap plate and the cylinder may shift, still leading to cap-closing failure.

[0012] Therefore, there is an urgent need to develop a method for assembling cylindrical battery cells to improve the assembly accuracy of the cover plate and the cylinder, increase production efficiency, thereby improving the yield rate of assembling and reducing production costs. Summary of the Invention

[0013] This disclosure addresses the aforementioned technical problems by providing a method for closing cylindrical battery cells, which solves the technical issues of closing failure, cover plate deformation and jamming, and high equipment failure rate in the cylindrical battery cell closing process. It improves the assembly accuracy of cylindrical battery cell closing, increases production efficiency and yield, and reduces production costs.

[0014] One of the concepts of this disclosure is that it provides a method for closing a cylindrical battery cell cover, including tab bending, wherein the tab bending includes: obtaining the position of the cylindrical battery cell cover plate; comparing the position of the cover plate with a preset position to obtain the position deviation; and bending the tab using a bending mechanism based on the position deviation.

[0015] Specifically, on the one hand, after the electrode tabs are welded in the upstream process, the positions and orientations of the cover plates at both ends of the cylindrical battery cell are different. On the other hand, since the electrode plates connected to the cover plate and the cylinder are made of aluminum, which is relatively soft and easily deformed, the cover plate position is adjusted multiple times after the initial shaping to make the cover plate reach the preset position, thereby improving the assembly accuracy.

[0016] Furthermore, one of the concepts of this disclosure is that it provides a method for closing a cylindrical battery cell, which detects the cylindrical battery cell after the tab is bent, including: obtaining the position of the cover plate after the tab is bent, comparing it with the preset position, and if the position of the cover plate after the tab is bent does not reach the preset position, then the position of the cover plate is corrected again until the position of the cover plate reaches the preset position.

[0017] Specifically, by inspecting and readjusting the position of the cover plate after the electrode tab is bent, it can be ensured that the products entering the next process are all qualified products, thereby improving the assembly accuracy of the cover plate and the cylinder.

[0018] Furthermore, one of the concepts of this disclosure is that it provides a method for closing a cylindrical battery cell, including cover plate correction, wherein the cover plate correction includes: adjusting the included angle of the electrode posts of the cover plates at both ends of the cylindrical battery cell, and pre-concentricity of the cover plate with the plane of the cylinder port.

[0019] The adjustment of the pole angle of the end caps of the cylindrical battery cell includes: obtaining the pole angle value of the end caps of the end caps of the cylindrical battery cell; comparing the pole angle value of the end caps of the end caps of the cylindrical battery cell with a preset angle value to obtain the angle deviation of the pole angle value of the end caps of the end caps of the cylindrical battery cell relative to the preset angle value; and adjusting the pole angle of one end and / or both ends of the end caps of the cylindrical battery cell using a cover plate correction mechanism based on the angle deviation.

[0020] Specifically, the positive and negative terminals of the cylindrical battery cell are strip-shaped. When installing the terminals onto the cover plate of the cylindrical battery cell, the installation posture of the terminals is not pre-set, making it difficult to maintain a consistent position for the terminals on both ends of the cover. When the included angle between the terminals at both ends is large, it will affect subsequent cell assembly. Therefore, adjusting the angle of one or both terminals of the cylindrical battery cell to control the included angle within a preset range is an essential step in the cylindrical battery cell capping process.

[0021] Furthermore, one of the concepts of this disclosure is that it provides a method for closing the cover of a cylindrical battery cell, which involves testing the cylindrical battery cell after the included angle of the end plates of the cover plates at both ends of the cylindrical battery cell has been adjusted. The method includes: obtaining the included angle value of the end plates of the cover plates at both ends of the cylindrical battery cell after adjustment by the cover plate correction mechanism, comparing it with the preset included angle value, and if the included angle value of the end plates of the cover plates at both ends of the cylindrical battery cell after adjustment is not within the range of the preset included angle value, then the cover plates at both ends of the cylindrical battery cell are corrected again until the preset included angle value is reached.

[0022] Specifically, by inspecting and readjusting the pole angle values ​​of the end caps of the cylindrical cell after the cover plate is corrected, it can be ensured that the products entering the next process are all qualified products, thereby improving the assembly accuracy of the cover plate and the cylinder.

[0023] Based on the above inventive concept, this disclosure provides a method for closing a cylindrical battery cell, including: bending the tabs and straightening the cover plate;

[0024] The tab bending process includes: obtaining the position of the cylindrical cell cover plate; comparing the position of the cover plate with a preset position to obtain the position deviation; and bending the tab using a bending mechanism based on the position deviation.

[0025] The cover plate correction includes: adjusting the included angle of the cover plate poles at both ends of the cylindrical cell, and pre-concentricity of the cover plate with the plane of the cylinder port;

[0026] The adjustment of the pole angle of the end caps on both ends of the cylindrical battery cell includes: obtaining the pole angle value of the end caps on both ends of the cylindrical battery cell; comparing the pole angle value of the end caps on both ends of the cylindrical battery cell with a preset angle value to obtain the angle deviation of the pole angle value of the end caps on both ends of the cylindrical battery cell relative to the preset angle value; and adjusting the pole angle of one end and / or both ends of the cylindrical battery cell using a cover plate correction mechanism based on the angle deviation.

[0027] The pre-concentricity of the cover plate and the cylinder port plane includes: obtaining the center position of the cover plate; obtaining the center position of the cylinder port plane; calculating the motion path to be moved by the cover plate straightening mechanism based on the coordinate deviation between the center position of the cover plate and the center position of the cylinder port plane; and the cover plate straightening mechanism straightening the cover plate according to the motion path to be moved.

[0028] The tab is bent to create a 3mm-5mm gap between the cover plate and the port plane of the cylindrical battery cell.

[0029] The cover plate is used to correct the electrode angle between the cover plates at both ends of the cylindrical cell to be within a preset angle range, and the center of the cover plate is aligned with the center of the cylindrical body port plane.

[0030] In some embodiments, the cylindrical cell capping method further includes tab bending detection, which is to detect the cylindrical cell after the tab is bent, including: obtaining the position of the cover plate after the tab is bent, comparing it with the preset position, and if the position of the cover plate after the tab is bent does not reach the preset position, then the position of the cover plate is corrected again until the position of the cover plate reaches the preset position.

[0031] In some embodiments, the cylindrical cell capping method further includes cap plate correction detection. The cap plate correction detection is to detect the included angle of the end plates of the cap plates at both ends of the cylindrical cell after cap plate correction. The detection includes: obtaining the included angle value of the end plates of the cap plates at both ends of the cylindrical cell after adjustment by the cap plate correction mechanism, comparing it with the preset included angle value, and if the included angle value of the end plates of the cap plates at both ends of the cylindrical cell after adjustment is not within the range of the preset included angle value, then the cap plates at both ends of the cylindrical cell are corrected again until the preset included angle value is reached.

[0032] The method for closing the cylindrical battery cell cover further includes: cover plate shaping, which is performed before the tab is bent;

[0033] The cover plate shaping includes: conveying cylindrical battery cells to the cover plate shaping station using a loading and unloading mechanism; obtaining the position of the cylindrical battery cell cover plate; obtaining the position of the cylindrical battery cell barrel end plane; calculating the motion path to be moved by the cover plate shaping mechanism based on the coordinate deviation between the position of the cylindrical battery cell cover plate and the position of the cylindrical battery cell barrel end plane; and shaping the cover plate according to the motion path to be moved.

[0034] The cover plate is shaped to make the cylindrical cell cover plate parallel to the port plane of the cylindrical cell body.

[0035] The method for closing the cylindrical battery cell cover further includes: aligning the cover plate, which is performed after the cover plate is corrected;

[0036] The cover plate alignment includes: obtaining the position of the cylindrical cell cover plate; obtaining the position of the cylindrical cell barrel port plane; calculating the motion path to be moved by the cover plate alignment mechanism based on the coordinate deviation between the position of the cylindrical cell cover plate and the position of the cylindrical cell barrel port plane; and aligning the cylindrical cell cover plate according to the motion path to be moved by the cover plate alignment mechanism.

[0037] The cover plate is aligned so that the cylindrical cell cover plate is parallel to the plane of the cylindrical cell barrel port and spaced 0.5mm-2mm apart, and the center of the cylindrical cell cover plate is aligned with the center of the plane of the cylindrical cell barrel port.

[0038] In some embodiments, the cylindrical cell capping method further includes cap alignment detection, wherein cap alignment is performed on the cylindrical cell after cap alignment, including: obtaining the position of the cylindrical cell cap; comparing the position of the cylindrical cell cap with the position of the cylindrical cell barrel port plane to obtain the positional deviation of the cylindrical cell cap relative to the cylindrical cell barrel port plane after cap alignment; if the positional deviation is not within a preset positional deviation range, then the cylindrical cell cap is aligned again until the preset positional deviation is reached.

[0039] The method for closing the cylindrical battery cell cover further includes closing the cover, which is performed after the cover plate is aligned.

[0040] The closing mechanism includes: using a closing mechanism to press the cylindrical cell cover plate against the cylindrical cell barrel port plane, so that the cylindrical cell cover plate is flush with the cylindrical cell barrel port plane.

[0041] This disclosure, through the above-mentioned technical solution, provides a method for closing cylindrical battery cells based on cover plate shaping, tab bending, tab bending detection, cover plate straightening, cover plate straightening detection, cover plate alignment, cover plate alignment detection, and cover closing. This method solves the technical problems of high failure rate, cover plate deformation and jamming, and high equipment failure rate in the pre-spot welding process of cylindrical battery cell cover closing. It improves the assembly accuracy and yield of cylindrical battery cell cover closing, significantly improves production efficiency, and reduces production costs.

[0042] This disclosure, through the above-mentioned technical solution, requires only one capping process after the cover plate is aligned to achieve the capping of the cylindrical battery cell. Compared with the prior art (patent application CN110492165A), which requires two capping processes, this improves the assembly accuracy of the cylindrical battery cell capping. Attached Figure Description

[0043] The present disclosure will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn for the purpose of explaining the preferred embodiments only and should therefore not be construed as limiting the scope of the present disclosure. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0044] Figure 1 This is a flowchart of a method for closing a cylindrical battery cell according to a specific embodiment of the present disclosure;

[0045] Figure 2 This is a process diagram illustrating a specific embodiment of the present disclosure. Detailed Implementation

[0046] The following is in conjunction with the appendix Figures 1 to 2 This disclosure will be explained in detail.

[0047] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this disclosure.

[0048] This disclosure solves the technical problems of high failure rate of cylindrical battery cell cover assembly, cover plate deformation and jamming, and high equipment failure rate through the above-mentioned technical solution, improves the assembly accuracy and yield of cylindrical battery cell cover assembly, significantly improves production efficiency and reduces production costs.

[0049] This disclosure provides a specific embodiment of a method for closing a cylindrical battery cell, such as... Figure 1 As shown, it includes:

[0050] Step 1: Cover plate shaping, which includes: conveying cylindrical battery cells to the cover plate shaping station using a loading and unloading mechanism; obtaining the position of the cylindrical battery cell cover plate; obtaining the position of the cylindrical battery cell barrel end plane; calculating the motion path of the cover plate shaping mechanism based on the coordinate deviation between the position of the cylindrical battery cell cover plate and the position of the cylindrical battery cell barrel end plane; and shaping the cover plate according to the motion path.

[0051] Preferably, the position of the cylindrical cell cover plate and the position of the cylindrical cell barrel port plane are obtained using an industrial camera or laser sensor.

[0052] The cover plate is shaped to make the cylindrical cell cover plate parallel to the port plane of the cylindrical cell body.

[0053] Step 2: Tab bending, the tab bending includes: obtaining the position of the cylindrical cell cover plate; comparing the position of the cover plate with a preset position to obtain the position deviation; and using a bending mechanism to bend the tab according to the position deviation.

[0054] The preset position is the position value of the cylindrical cell cover plate that is pre-set according to the process requirements of the tab bending process.

[0055] Preferably, the position of the cylindrical cell cover is obtained using an industrial camera or laser sensor.

[0056] The tab is bent to create a 3mm-5mm gap between the cover plate and the port plane of the cylindrical battery cell.

[0057] Step 3: Tab bending detection. The tab bending detection is to detect the cylindrical cell after the tab is bent, including: obtaining the position of the cover plate after the tab is bent and comparing it with the preset position. If the position of the cover plate after the tab is bent does not reach the preset position, the position of the cover plate is corrected again until the position of the cover plate reaches the preset position.

[0058] Based on step 2, according to the preset position, the cover plate is brought to the preset position by bending the tabs; based on step 3, the position of the cover plate of the cylindrical cell after the tabs are bent is detected and readjusted to ensure that the products entering the next process are all qualified products, thereby improving the assembly accuracy of the cover plate and the cylinder and increasing the yield rate.

[0059] Step 4: Cover plate correction, which includes: adjusting the included angle of the cover plate poles at both ends of the cylindrical cell, and pre-concentricity of the cover plate with the plane of the cylinder port;

[0060] The adjustment of the pole angle of the end caps on both ends of the cylindrical battery cell includes: obtaining the pole angle value of the end caps on both ends of the cylindrical battery cell; comparing the pole angle value of the end caps on both ends of the cylindrical battery cell with a preset angle value to obtain the angle deviation of the pole angle value of the end caps on both ends of the cylindrical battery cell relative to the preset angle value; and adjusting the pole angle of one end and / or both ends of the cylindrical battery cell using a cover plate correction mechanism based on the angle deviation.

[0061] The pre-concentricity of the cover plate and the cylinder port plane includes: obtaining the center position of the cover plate; obtaining the center position of the cylinder port plane; calculating the motion path to be moved by the cover plate straightening mechanism based on the coordinate deviation between the center position of the cover plate and the center position of the cylinder port plane; and the cover plate straightening mechanism straightening the cover plate according to the motion path to be moved.

[0062] The cover plate is used to correct the electrode angle between the cover plates at both ends of the cylindrical cell to be within a preset angle range, and the center of the cover plate is aligned with the center of the cylindrical body port plane.

[0063] The preset pole angle value is the pole angle value of the cover plates at both ends of the cylindrical cell, which is preset according to the process requirements of the cover plate straightening process.

[0064] Preferably, the included angle value of the end caps of the cylindrical battery cell is obtained using an industrial camera or laser sensor.

[0065] Based on step 4, the pole angles of the end caps of the cylindrical cell are adjusted according to the preset pole angle values. After adjusting the pole angles of the end caps of the cylindrical cell, the caps are concentrically operated according to the center of the cylindrical body port plane, so that the position of the caps and the pole angles of the end caps of the cylindrical cell are both adjusted, thereby improving the assembly accuracy of the caps and the cylindrical body.

[0066] Step 5: Cover plate correction test. The cover plate correction test is to detect the included angle of the end plates of the cylindrical cell after cover plate correction. This includes: obtaining the included angle value of the end plates of the cylindrical cell after adjustment by the cover plate correction mechanism, comparing it with the preset included angle value. If the included angle value of the end plates of the cylindrical cell after adjustment is not within the range of the preset included angle value, the cover plates of the cylindrical cell are corrected again until the preset included angle value is reached.

[0067] Based on step 5, the included angle between the end caps and poles of the cylindrical cell after the cover plate is corrected is detected and readjusted. This ensures that all products entering the next process are qualified, thereby improving the assembly accuracy of the cover plate and the cylinder and increasing the yield rate.

[0068] Step 6: Cover plate alignment, which includes: obtaining the position of the cylindrical cell cover plate; obtaining the position of the cylindrical cell barrel port plane; calculating the motion path of the cover plate alignment mechanism based on the coordinate deviation between the position of the cylindrical cell cover plate and the position of the cylindrical cell barrel port plane; and aligning the cylindrical cell cover plate according to the motion path.

[0069] The cover plate is aligned so that the cylindrical cell cover plate is parallel to the plane of the cylindrical cell barrel port and spaced 0.5mm-2mm apart, and the center of the cylindrical cell cover plate is aligned with the center of the plane of the cylindrical cell barrel port.

[0070] Preferably, the position of the cylindrical cell cover plate and / or the position of the cylindrical cell barrel port plane are obtained using an industrial camera or laser sensor.

[0071] Step 7: Cover plate alignment detection. The cover plate alignment detection is to detect the cylindrical cell after the cover plate is aligned, including: obtaining the position of the cylindrical cell cover plate; comparing the position of the cylindrical cell cover plate with the position of the cylindrical cell barrel port plane to obtain the positional deviation of the cylindrical cell cover plate relative to the cylindrical cell barrel port plane after alignment; if the positional deviation is not within the preset positional deviation range, the cylindrical cell is aligned again until the preset positional deviation is reached.

[0072] Step 8: Closing the cover, which includes: using a closing mechanism to press the cylindrical cell cover plate against the cylindrical cell barrel end plane, so that the cylindrical cell cover plate is flush with the cylindrical cell barrel end plane.

[0073] In this specific embodiment, the method for closing the cylindrical battery cell cover includes: shaping the cylindrical battery cell cover using a cover plate shaping mechanism; bending the tabs using a bending mechanism; inspecting the cylindrical battery cell after the tabs are bent; adjusting the included angle between the cover plates and the electrodes at both ends of the cylindrical battery cell using a cover plate straightening mechanism, pre-concentrically positioning the cover plate with the cylindrical body port plane, and performing cover plate straightening; inspecting the included angle between the cover plates and the electrodes at both ends of the cylindrical battery cell after cover plate straightening; aligning the cylindrical battery cell cover using a cover plate alignment mechanism; inspecting the cylindrical battery cell after cover plate alignment; and closing the cover using a closing mechanism to press the cylindrical battery cell cover plate against the cylindrical battery cell port plane, thus closing the cover. That is, the steps of the cylindrical battery cell closing method are as follows: Figure 2 As shown, the specific steps include: cover plate shaping, electrode ear bending, electrode ear bending detection, cover plate correction, cover plate correction detection, cover plate alignment, cover plate alignment detection, and cover closing.

[0074] The sequence of processes in the cylindrical battery cell capping method is fixed and cannot be adjusted. Each process addresses its own technical problem, and each subsequent process builds upon the previous one. Cover plate shaping ensures the cover plate is parallel to the cylindrical cell's end plane. Tab bending, based on cover plate shaping, maintains a 3mm-5mm gap between the cover plate and the cylindrical cell's end plane. Tab bending inspection ensures all products entering cover plate correction are qualified. Cover plate correction ensures the included angle between the end plates of the cylindrical cell's two ends is within a preset range, and the center of the cover plate is aligned with the center of the cylindrical cell's end plane. Cover plate correction inspection ensures products entering the cover plate alignment are qualified. Cover plate alignment ensures the cover plate is parallel to the cylindrical cell's end plane with a 0.5mm-2mm gap, and the center of the cover plate is aligned with the center of the cylindrical cell's end plane. Cover plate alignment inspection ensures all products entering the capping process are qualified, and the caps are finally closed. Therefore, the cylindrical battery cell capping method is procedural and has a fixed sequence.

[0075] The tab bending, cover plate straightening, and cover plate alignment are key processes in the cylindrical battery cell capping method. Inspections are performed after tab bending, cover plate straightening, and cover plate alignment to ensure that all products entering the next process are qualified, thereby improving the assembly accuracy of cylindrical battery cell capping.

[0076] This disclosure, through the above specific embodiments, solves the technical problems of high failure rate of cover assembly, cover plate deformation and jamming, and high equipment failure rate in the pre-spot welding process of cylindrical battery cell cover assembly. It improves the assembly accuracy and yield of cylindrical battery cell cover assembly, significantly improves production efficiency, and reduces production costs.

[0077] The present disclosure has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present disclosure. The descriptions of the embodiments above are only for the purpose of helping to understand the present disclosure and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present disclosure without departing from the principles of the present disclosure, and these improvements and modifications also fall within the protection scope of the claims of the present disclosure.

Claims

1. A method for closing a cylindrical battery cell, characterized in that, include: Bend the tabs and straighten the cover plate; The tab bending includes: obtaining the position of the cylindrical cell cover plate; comparing the position of the cover plate with a preset position to obtain the position deviation; and bending the tab using a bending mechanism based on the position deviation. The cover plate correction includes: adjusting the pole angle of the cover plates at both ends of the cylindrical cell, and pre-concentricity of the cover plate with the port plane of the cylinder. The pole angle adjustment of the cover plates at both ends of the cylindrical cell includes: obtaining the pole angle value of the cover plates at both ends of the cylindrical cell; comparing the pole angle value of the cover plates at both ends of the cylindrical cell with a preset angle value to obtain the angle deviation of the pole angle value of the cover plates at both ends of the cylindrical cell relative to the preset angle value; and adjusting the pole angle of one end and / or both ends of the cover plates of the cylindrical cell using a cover plate correction mechanism based on the angle deviation. The pre-concentricity of the cover plate and the cylindrical body port plane includes: obtaining the center position of the cover plate; obtaining the center position of the cylindrical body port plane; calculating the motion path to be moved by the cover plate straightening mechanism based on the coordinate deviation between the center position of the cover plate and the center position of the cylindrical body port plane; the cover plate straightening mechanism straightening the cover plate according to the motion path to be moved; and cover plate shaping, which is performed before the tab bending. The cover plate shaping includes: using a loading and unloading mechanism to transport the cylindrical battery cell to the cover plate shaping station; obtaining the position of the cylindrical battery cell cover plate; obtaining the position of the cylindrical battery cell port plane; calculating the motion path to be moved by the cover plate shaping mechanism based on the coordinate deviation between the position of the cylindrical battery cell cover plate and the position of the cylindrical battery cell port plane; and the cover plate shaping mechanism shaping the cover plate according to the motion path to be moved. Through the cover plate shaping, the cylindrical battery cell cover plate is made parallel to the cylindrical battery cell port plane.

2. The method for closing the cylindrical battery cell as described in claim 1, characterized in that, The electrode tabs are bent to create a 3mm-5mm gap between the cover plate and the cylindrical cell port plane; the cover plate is then straightened to ensure that the electrode angle between the cover plates at both ends of the cylindrical cell is within a preset range, and the center of the cover plate is aligned with the center of the cylindrical cell port plane.

3. The method for closing the cylindrical battery cell as described in claim 1, characterized in that, It also includes tab bending detection, which is to detect the cylindrical cell after the tab is bent. This includes: obtaining the position of the cover plate after the tab is bent and comparing it with the preset position. If the position of the cover plate after the tab is bent does not reach the preset position, the position of the cover plate is corrected again until the position of the cover plate reaches the preset position.

4. The method for closing the cylindrical battery cell as described in claim 1, characterized in that, It also includes cover plate correction detection, which is to detect the included angle of the end plates of the cylindrical cell after cover plate correction. This includes: obtaining the included angle value of the end plates of the cylindrical cell after adjustment by the cover plate correction mechanism, comparing it with the preset included angle value, and if the included angle value of the end plates of the cylindrical cell after adjustment is not within the range of the preset included angle value, then the cover plates of the cylindrical cell are corrected again until the preset included angle value is reached.

5. The method for closing the cylindrical battery cell as described in claim 1, characterized in that, Also includes: The cover plate alignment is performed after the cover plate is corrected. The cover plate alignment includes: obtaining the position of the cylindrical cell cover plate; obtaining the position of the cylindrical cell barrel port plane; calculating the motion path of the cover plate alignment mechanism based on the coordinate deviation between the position of the cylindrical cell cover plate and the position of the cylindrical cell barrel port plane; and aligning the cylindrical cell cover plate according to the motion path. Through the cover plate alignment, the cylindrical cell cover plate is made parallel to the cylindrical cell barrel port plane and spaced 0.5mm-2mm apart, and the center of the cylindrical cell cover plate is aligned with the center of the cylindrical cell barrel port plane.

6. The method for closing the cylindrical battery cell as described in claim 5, characterized in that, Also includes: The cover plate alignment detection is a detection of the cylindrical battery cell after the cover plate is aligned, including: obtaining the position of the cover plate of the cylindrical battery cell; The position of the cylindrical cell cover plate is compared with the position of the cylindrical cell barrel port plane to obtain the positional deviation of the cylindrical cell cover plate relative to the cylindrical cell barrel port plane after the cover plate is aligned; if the positional deviation is not within the preset positional deviation range, the cylindrical cell cover plate is aligned again until the preset positional deviation is reached.

7. The method for closing the cylindrical battery cell as described in claim 1, characterized in that, Also includes: The lid is closed after the cover plate is aligned; the lid closure includes: using a lid closure mechanism to press the cylindrical cell cover plate against the cylindrical cell barrel port plane, so that the cylindrical cell cover plate and the cylindrical cell barrel port plane are flush and aligned.

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