CN-121566069-B - Pole welding control method and equipment, welding system, battery production line, medium and product

Abstract

The application discloses a pole welding control method and equipment, a welding system, a battery production line, a medium and a product, and relates to the technical field of battery production, wherein the target battery pole is part of battery poles in a battery pack by performing first welding based on the actual coordinates of the target battery pole, and the small-power welding is not required to be performed on all the battery poles on the battery pack, so that the time for the first welding is reduced; and the actual coordinates of other battery core poles of the battery pack are automatically compensated according to the deviation value of the actual coordinates of the target battery core poles and the corresponding welded first welding coordinates, so that the second welding coordinates of the battery core poles of the battery pack are obtained, and the time consumption for correcting deviation is reduced. And finally, performing secondary welding on the battery core electrode column of the battery pack based on the compensated second welding coordinates. The welding quality is guaranteed, the adjustment time of the product after the mold change is greatly shortened, and the production efficiency and the adaptability are improved.

Inventors

• WANG LEI
• KE PENGFEI
• ZHAN SHUJIA
• LI JINGYU
• LIN JIN
• LIN YAN

Assignees

• 宁德时代新能源科技股份有限公司
• 宁德福宁时代新能源有限公司

Dates

Publication Date

20260512

Application Date

20260123

Claims (16)

1. 1. A pole welding control method is applied to battery production, characterized in that the method comprises: Acquiring actual coordinates of the battery core electrode column of the battery pack under a welding coordinate system based on a welding system; Performing first welding on a target electric core pole column based on the actual coordinates of the target electric core pole column on the battery pack, wherein the target electric core pole column is a part of electric core pole columns in the battery pack; When the deviation value of the actual coordinates of the target battery cell polar column and the first welding coordinates obtained after welding is larger than or equal to a preset threshold value, compensating the actual coordinates of the battery cell polar column of the battery pack according to the deviation value to obtain second welding coordinates of the battery cell polar column of the battery pack; And carrying out second welding on the battery core pole of the battery pack based on second welding coordinates of the battery core pole of the battery pack, wherein the power of the second welding is larger than that of the first welding.
2. 2. The method of claim 1, wherein the battery pack includes a plurality of predetermined areas, each predetermined area including at least one of the target cell posts therein; the first welding of the target cell pole based on the actual coordinates of the target cell pole on the battery pack includes: performing first welding on the target cell pole in each preset area based on the actual coordinates of the target cell pole in each preset area on the battery pack; Correspondingly, when the deviation value between the actual coordinate of the target battery cell post and the first welding coordinate obtained after welding is greater than or equal to a preset threshold, compensating the actual coordinate of the battery cell post of the battery pack according to the deviation value to obtain a second welding coordinate of the battery cell post of the battery pack, including: And compensating the actual coordinates of all the battery cell poles in each preset area according to the deviation value when the deviation value of the actual coordinates of the target battery cell poles in each preset area and the corresponding welded first welding coordinates is larger than or equal to the preset threshold value, so as to obtain the second welding coordinates of all the battery cell poles in each preset area.
3. 3. The method of claim 2, wherein the predetermined area comprises a plurality of cell poles of a same cell, the target cell pole being at least one cell pole of the same cell; The compensating the actual coordinates of all the battery cell poles in each preset area according to the deviation value to obtain second welding coordinates of all the battery cell poles in each preset area, including: And compensating the actual coordinates of all the battery cell poles of the same battery cell according to the deviation value of the target battery cell pole in the same battery cell to obtain second welding coordinates of all the battery cell poles of the same battery cell.
4. 4. The method of claim 2, wherein the predetermined area comprises a plurality of cell posts located on the same fitting line; The compensating the actual coordinates of all the battery cell poles in each preset area according to the deviation value to obtain second welding coordinates of all the battery cell poles in each preset area, including: and compensating the actual coordinates of all the electric core poles on the same fitting straight line according to the deviation value of the target electric core poles on the same fitting straight line to obtain second welding coordinates of all the electric core poles on the same fitting straight line.
5. 5. The method of any of claims 1-4, wherein the obtaining, based on the welding system, actual coordinates of the cell posts of the battery pack in the welding coordinate system comprises: Acquiring theoretical coordinates of the battery core pole column and the marking point of the battery pack under the welding coordinate system; Acquiring actual coordinates of the marking point under the welding coordinate system based on the welding system based on the theoretical coordinates of the marking point; determining a first compensation amount according to the theoretical coordinates of the marked points and the actual coordinates of the marked points; Compensating the theoretical coordinates of the battery cell pole of the battery pack under the welding coordinate system according to the first compensation quantity to obtain the initial coordinates of the battery cell pole of the battery pack under the welding coordinate system; based on initial coordinates of the battery cell pole of the battery pack, acquiring actual coordinates of the battery cell pole of the battery pack under a welding coordinate system based on the welding system.
6. 6. The method of claim 5, wherein the obtaining theoretical coordinates of the cell post and the marker point of the battery pack in the welding coordinate system comprises: obtaining model coordinates of the battery core pole column and the marking point of the battery pack under a three-dimensional design model coordinate system, wherein the model coordinates are obtained according to a three-dimensional design model of the battery pack on a welding system station; And converting the model coordinates of the battery core pole column and the marking point of the battery pack into theoretical coordinates under the welding coordinate system.
7. 7. The welding system is characterized by comprising a visual camera, a mechanical arm, a laser welding piece and a controller, wherein the laser welding piece is arranged on the mechanical arm; The controller is configured to control the vision camera to obtain actual coordinates of a battery cell pole of a battery pack under a welding coordinate system, control the mechanical arm to drive the laser welding piece to weld the target battery cell pole for the first time based on the actual coordinates of a target battery cell pole of the battery pack, control the mechanical arm to drive the laser welding piece to weld the battery cell pole for the second time based on the second welding coordinates of the battery cell pole of the battery pack, and control the mechanical arm to drive the laser welding piece to weld the battery cell pole of the battery pack for the second time based on the second welding coordinates of the battery cell pole of the battery pack when the deviation value of the actual coordinates of the target battery cell pole and the first welding coordinates obtained after welding is larger than or equal to a preset threshold value, wherein the power of the second welding is larger than that of the first welding.
8. 8. The system of claim 7, wherein the controller is configured to control the robotic arm to drive the laser welder to weld the target cell pole in each preset area for the first time based on the actual coordinates of the target cell pole in each preset area on the battery pack, and correspondingly, when the deviation value of the actual coordinates of the target cell pole in each preset area and the corresponding welded first welding coordinates is greater than or equal to the preset threshold, compensate the actual coordinates of all cell poles in each preset area according to the deviation value to obtain the second welding coordinates of all cell poles in each preset area.
9. 9. The system of claim 8, wherein the predetermined area comprises a plurality of cell poles of a same cell, the target cell pole is at least one cell pole of the same cell, and the controller is configured to compensate actual coordinates of all cell poles of the same cell according to a deviation value of the target cell pole in the same cell to obtain second welding coordinates of all cell poles of the same cell.
10. 10. The system of claim 8, wherein the predetermined area comprises a plurality of cell poles positioned on a same fit line, and wherein the controller is configured to compensate actual coordinates of all cell poles on the same fit line based on the deviation value of the target cell pole on the same fit line to obtain second welding coordinates of all cell poles on the same fit line.
11. 11. The system of any of claims 7-10, wherein the welding system further comprises a gantry tri-axial mechanism; The controller is configured to control the mechanical arm to plug a first copper nozzle on the gantry triaxial mechanism under the condition that the change of the model of the battery pack is detected before the actual coordinates of the battery cell pole of the battery pack under the welding coordinate system are obtained, wherein the first copper nozzle is matched with the model of the battery pack, and the size of the first copper nozzle is matched with the size of the battery cell pole of the battery pack.
12. 12. The system of claim 11, wherein the welding system further comprises a range finder; The controller is configured to control the distance meter to acquire a first distance from the upper surface of the target battery cell post after acquiring the actual coordinates of the battery cell post of the battery pack in the welding coordinate system and before controlling the mechanical arm to drive the laser welding piece to weld the target battery cell post for the first time based on the actual coordinates of the target battery cell post on the battery pack; And controlling the gantry triaxial mechanism to drive the first copper nozzle to move to the actual coordinate position of the target cell pole, and driving the first copper nozzle to press down based on the first distance and the thickness of the tab so as to enable the first copper nozzle to be in contact with the tab on the target cell pole.
13. 13. A battery production line comprising a welding system according to any of the preceding claims 7-12.
14. 14. A pole welding control device, characterized in that the device comprises a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program being configured to implement the steps of the pole welding control method according to any one of claims 1 to 6.
15. 15. A storage medium, characterized in that the storage medium is a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, realizes the steps of the pole welding control method according to any one of claims 1 to 6.
16. 16. A computer program product, characterized in that it comprises a computer program which, when executed by a processor, implements the steps of the pole welding control method according to any one of claims 1 to 6.

Description

Pole welding control method and equipment, welding system, battery production line, medium and product Technical Field The application relates to the technical field of battery production, in particular to a pole welding control method and equipment, a welding system, a battery production line, a medium and a product. Background In the production process of the battery, a plurality of poles of a plurality of battery cells in a battery pack are required to be welded with a bus assembly (also called a tab) to realize the electrical connection of the plurality of battery cells. If the bus assembly is off-set from the post, the performance of the battery will be affected. After the battery pack type on the production line is replaced, the visual camera is required to acquire the actual coordinates of the battery core pole of the replaced battery pack again, low-power welding is performed based on the actual coordinates, and if deviation occurs between the welded welding coordinates and the actual coordinates of the battery core pole, a worker is required to perform high-power welding after manually correcting and assigning values one by one, so that bias welding is avoided. However, the low-power welding and manual correction process take longer time, so that the adjustment time is too long after the product is changed, and the production efficiency is reduced. Disclosure of Invention The application mainly aims to provide a pole welding control method and equipment, a welding system, a battery production line, a medium and a product, and aims to ensure welding quality, greatly shorten adjustment time after product model change and improve production efficiency and adaptability. The application provides a pole welding control method which is applied to battery production and comprises the steps of obtaining actual coordinates of a battery core pole of a battery pack under a welding coordinate system based on a welding system, carrying out first welding on a target battery core pole based on the actual coordinates of the target battery core pole, wherein the target battery core pole is part of the battery core pole in the battery pack, and compensating the actual coordinates of the battery core pole of the battery pack according to the deviation value when the deviation value of the actual coordinates of the target battery core pole and the first welding coordinates obtained after welding is larger than or equal to a preset threshold value, so as to obtain second welding coordinates of the battery core pole of the battery pack, and carrying out second welding on the battery core pole of the battery pack based on the second welding coordinates of the battery core pole of the battery pack, wherein the power of the second welding is larger than that of the first welding. According to the embodiment of the application, the actual coordinates of the battery cell poles of the battery pack in the welding coordinate system are obtained through the welding system, the first welding (low power) is carried out based on the actual coordinates of the target battery cell poles, the target battery cell poles are part of the battery cell poles in the battery pack, and the low power welding is not needed to be carried out on all the battery cell poles on the battery pack, so that the time for the first welding (low power) is shortened, and the deviation value of the actual coordinates of the target battery cell poles and the corresponding welded first welding coordinates is obtained, and when the deviation value is greater than or equal to a preset threshold value, the actual coordinates of other battery cell poles of the battery pack are automatically compensated according to the deviation value, so that the second welding coordinates of the battery cell poles of the battery pack are obtained, the manual deviation correction of a worker is not needed one by one, the automatic deviation correction is realized, and the time consumed for correcting is reduced. And finally, based on the compensated second welding coordinates, performing second welding (high power) on the battery core electrode column of the battery pack, wherein the first welding (low power) is only used for sampling and deviation calculation, and the second welding uses high power to finish final welding, so that the reliability of welding strength is ensured, and the welding bias risk is reduced through coordinate compensation. In the embodiment, the welding quality is ensured, the adjustment time of the product after the mold change is greatly shortened, and the production efficiency and the adaptability are improved. In an embodiment, the battery pack comprises a plurality of preset areas, wherein each preset area comprises at least one target cell pole, and the first welding of the target cell pole is performed based on the actual coordinates of the target cell pole on the battery pack, and comprises the steps of performing the first welding of the target cell