Battery cell adapter plate and welding method thereof
A welding method and adapter piece technology, applied in welding equipment, laser welding equipment, circuits, etc., can solve the problems that tabs occupy the upper space of the battery core, affect the space utilization rate and energy density of the battery core, and improve the welding cycle And the efficiency, reduce the occupation, improve the effect of energy density
Pending Publication Date: 2022-07-29
REPT BATTERO ENERGY CO LTD +1
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Problems solved by technology
[0005] The embodiment of the present application provides a cell adapter and its welding method to solve the problem in the related art that the tab part will occupy the upper space of the cell and affect the space utilization rate and energy density of the cell
Method used
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Embodiment 1
[0067] The following is a comparison table of the internal resistance and open circuit voltage of the hollow adapter and the non-hollow adapter when the same tab is located above the adapter (100% SOC and 70% SOC refer to the load capacity of the battery)
[0068]
[0069] From the data analysis, it can be seen that the adapter with the anti-tear hollow slot 4 has a better vibration resistance effect (the open circuit voltage remains basically unchanged after the vibration, and the internal resistance increases slightly; the open circuit voltage of the non-hollow adapter decreases The internal resistance increases a lot), mainly because the anti-tear hollow groove 4 makes the adapter sheet hollow, the strength of the adapter sheet decreases, and the tearing of the tabs is improved.
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Abstract
The invention relates to a battery cell adapter plate and a welding method thereof. An anti-tear hollow groove is formed in a tab connecting part of the battery cell adapter plate. Placing the battery cell adapter plate above the tabs of the paired roll cores, and enabling the orthographic projection of the anti-tearing hollow groove to fall on the tabs; carrying out laser welding along the edge track of the anti-tearing hollow groove so as to connect the tab connecting part and the tab; and connecting the battery cell adapter sheet with the top cover through laser welding. According to the structure, the steps of the subsequent welding process are changed, that is, in the welding process before core winding and combining, the battery core switching piece is arranged on the tab, after core combining, the battery core switching piece is located at the lowest part, and the tab is located in a gap space between the battery core switching piece and the top cover, so that the occupation of the battery core space after the battery core enters a shell is reduced, and the battery core assembling efficiency is improved. The energy density is improved; the anti-tearing hollow groove reduces the strength of the tab connecting part, so that the probability that the tab is torn by the adapter plate is reduced when the core is closed.
Description
technical field [0001] The present application relates to the technical field of new energy battery production, in particular to a battery cell adapter and a welding method thereof. Background technique [0002] At present, in the field of new energy battery production, the welding of the adapter body is an indispensable process, and its function is to connect the top cover pole of the square shell battery and the inner cell tab of the battery to form current conduction. [0003] In some related technologies, the welding process of the normal compact structure of the adaptor body generally includes the following steps: pairing of winding cores; ultrasonic welding of the tab 1 and the tab connection part 2 of the adaptor; laser welding of the adaptor and the top cover; Into the core; into the shell. [0004] Among them, such as figure 1 As shown in the figure, during the ultrasonic welding of the tab 1 and the tab connecting portion 2 of the adapter sheet, the winding cores...
Claims
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IPC IPC(8): H01M50/528H01M50/531H01M50/538B23K26/21B23P15/00
CPCH01M50/528H01M50/531H01M50/538B23K26/21B23P15/00B23K2101/36
Inventor 王兴东吴仕明刘建永余招宇侯敏曹辉
Owner REPT BATTERO ENERGY CO LTD