Lithium ion battery parallel formation system and process

Abstract

The invention discloses a lithium ion battery parallel formation system. The lithium ion battery parallel formation system comprises a formation cabinet, a formation device and a gas circulating piece, wherein the formation device comprises a formation tank, an adjusting rod, an electrode plate, a lifting piece and a clamping plate; the formation device is placed in the formation cabinet; to-be-formed batteries are placed in the formation tank and are matched with the rest components of the formation device so that the to-be-formed batteries are in parallel connection with the rest componentsof the formation device; and by a gas circulating system, gas generated by formation of the batteries is continuously discharged from the formation cabinet. By the lithium ion battery parallel formation system, the to-be-formed batteries are in parallel connection, a plurality of batteries can be formed at a time, formation space is saved, operation steps are reduced, by the formation cabinet andthe gas circulating piece, the gas generated by formation of the batteries is discharged rapidly, SEI films are formed uniformly, the formation is good, moreover, workers are not in direct contact with the gas discharged by formation, health of the workers is ensured, by the adjusting rod, positive and negative tabs of the formed batteries are separately maintained on a straight line, and thus, the battery formation consistency is high.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery production, in particular to a lithium ion battery parallel formation system and process. Background technique [0002] In the production process of lithium-ion batteries, formation is an extremely important process. Formation refers to the process of charging and discharging the battery after liquid injection for the first time. Its main function is to form on the surface of the negative electrode through the electrochemical reaction in the first charge. Dense SEI film (Solid Electrolyte Interface, solid electrolytic interface film), while eliminating the gas generated in the process of forming the SEI film, to prevent the battery from inflating the shell and other adverse phenomena. At present, most of the industry adopts the opening formation process in which the battery is placed in the workshop. The gas generated during the formation process in this way is not fully discharged and...

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Problems solved by technology

At present, most of the industry adopts the opening formation process in which the battery is placed in the workshop. The gas generated during the formation process in this way is not fully discharged and accumulates inside the battery, which has a great impact on the formation of the SEI film. In addition, the existing One channel of the formation cabinet can only be formed into one battery at a time, and in order to prevent the battery shell from corroding the battery casing by the electrolyte brought out during the battery’s moisture absorption and formation exhaust, each battery needs to be tied with a paper towel at the liquid injection port, and it needs to be adjusted according to the humidity and external conditions. Clean the battery casing in case of leakage, which not only reduces the production efficiency, but also increases the cost of labor and production

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