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A tab welding and pole piece technology, which is applied in the field of new pole piece tab welding technology, can solve the problems of poor consistency of the welding process
Active Publication Date: 2022-03-11
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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[0005] The purpose of the present invention is to provide a new pole piece and lug welding process in view of the deficiencies in the prior art, which has the characteristics of high precision, reliable welding effect, and high welding consistency, which helps to solve the poor consistency of welding processes in the industry at present. and other issues, while improving the energy density of the cell
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Embodiment 1
[0036] Such as Figure 1~5 As shown, a new pole piece tab welding process includes the following steps:
[0037] S1. Prepare pole piece 1 and pole lug 2 that need to be welded together;
[0038] S2, cleaning the surface of the first welding surface 1' of the metal part of the pole piece 1 and the second welding surface 2' of the metal part of the tab 2;
[0039] S3. Put the pole piece 1 and the pole lug 2 into the vacuum chamber of the vacuum cold press tooling 3;
[0040] S4. Vacuumize the vacuum chamber and keep it for a period of time; in practical applications, it is preferred to keep it for 8s to 20s;
[0041] S5. In the vacuum cavity, use the cold press tool 3 to squeeze the surface-treated first welding surface 1' and the second welding surface 2' together; in practical applications, place the pole piece 1 and the pole ear 2 on Cold-press welding is performed on the workbench of the cold-press tooling 3;
[0042] S6. Fill the vacuum cavity with dry gas to complete t...
Embodiment 2
[0054] The difference from Embodiment 1 is that in this embodiment, in step S4, the vacuum chamber is evacuated and kept for 10s. This process design makes the vacuuming effect the best, and it is beneficial to shorten the processing time.
[0055] The rest are the same as in Embodiment 1, and will not be repeated here.
Embodiment 3
[0057] The difference from Example 1 is that in this example, the compression ratio of cold press tooling 3 to pole piece 1 and tab 2 is 75%, and the welding pressure is 3.5 MPa. In this environment, the pole piece 1 and the pole ear 2 are closely bonded, which is conducive to the diffusion and fusion of atoms between the pole piece 1 and the pole ear 2, and the process difficulty is low, and the processing is easy to realize.
[0058] The rest are the same as in Embodiment 1, and will not be repeated here.
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Abstract
The invention belongs to the technical field of lithium batteries, and in particular relates to a new welding process for pole pieces and tabs, comprising the following steps: S1, preparing the pole pieces and the pole tabs to be welded together; S2, first welding the metal parts of the pole pieces Clean the surface of the second welding surface of the metal part of the electrode and the metal part of the pole lug; S3, put the pole piece and the pole lug into the vacuum chamber of the vacuum cold pressing tool; S4, vacuum the vacuum chamber and keep it for a period of time; S5 . In the vacuum chamber, use a cold pressing tool to squeeze the surface-treated first welding surface and the second welding surface together; S6, fill the vacuum chamber with dry gas to complete the welding. The welding process has the characteristics of high precision, reliable welding effect and high welding consistency, which helps to solve the problems of poor consistency of welding procedures in the current industry, and at the same time can improve the energy density of the cell.
Description
technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a novel pole piece and tab welding process. Background technique [0002] Conventional lithium-ion batteries are square. In order to increase the energy density of batteries, special-shaped batteries are gradually appearing on the market. [0003] In the prior art, the mainstream pole piece welding schemes include ultrasonic welding and laser welding. Among them, the ultrasonic welding method uses ultrasonic vibration and heat to weld the pole piece and the tab together. This method has low welding consistency and stability during the process. Poor, and the wear of the welding head welding seat is relatively serious, there is a risk of failure such as virtual welding and over welding, while laser welding uses a laser to burn the joints of the two materials at high temperature, so that the melting point of the two materials is reached, and the two materials a...
Claims
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Application Information
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