Battery forming and repairing method

Abstract

The invention discloses a forming method of a lithium ion battery, which is characterized by comprising the following steps of: (1) after fluid injection of the battery, under the condition that the temperature is between -10 and 35 DEG C, performing partial formation on the battery through low-current low-voltage section charge-discharge circulation; (2) performing high-current medium-voltage section fast charge-discharge circulation on the battery until the internal temperature of the battery reaches and keeps between 30 and 45 DEG C, and then performing local formation on the battery through low-current high-voltage section charge-discharge circulation; and (3) performing deep formation on the lithium ion battery through high-current deep charge-discharge circulation. All the steps arecarried out by using the same equipment at the same environmental temperature. After the formation by the method, the cathode surface SEI film of the battery is thinner, more compact and firmer, the stability of an electrode surface is effectively enhanced, an anode active material is fully used, the energy of the battery is high, the capacitive properties, the cycle performance, the rate capability and the safety performance of the battery are also improved, and simultaneously, the process is effectively simplified, the productivity is improved, and the equipment investment and the maintenance cost are reduced.

Description

technical field [0001] The invention relates to a primary formation treatment method of a lithium ion battery, in particular to a charge and discharge formation treatment method of a phosphate lithium ion battery. This method can also be used for repairing old batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high output voltage, high output power, fast charging and low pollution. With the popularization of green energy, the application range of lithium-ion batteries is becoming wider and wider, but its safety issues have been hindering its development. The safety of lithium-ion batteries is closely related to the formation of batteries. The traditional battery formation method: the battery soaked by liquid injection is charged with a small current and a constant current between 0.01 and 0.2 times. The charging time is 0.2 to 5 hours, and then charged with a large current and a constant current between 0.2 and 3 time...

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries have the advantages of high energy density, high output voltage, high output power, fast charging and low pollution. With the popularization of green energy, the application range of lithium-ion batteries is becoming wider and wider, but its safety issues have been hindering its development

The above chemical conversion treatment method has long chemical conversion time, insufficient chemical conversion, insufficient uniformity and density of the SEI (Solid Electrolyte Interface) film, and a large waste of positive electrode capacity

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