Lithium ion battery formation clamp and method

Abstract

According to the lithium ion battery formation clamp and the lithium ion battery formation method provided by the invention, the single batteries are subjected to multiple charging, discharging and final aging steps for formation, the voltage difference of the single batteries is tested after formation, and bad batteries are selected, so that the battery matching process is simplified, and the production efficiency of the batteries is improved. Through formation combining high-temperature aging and normal-temperature aging and then matching, the selected single batteries are better in voltage consistency, the utilization rate of the capacity of the single batteries can be improved, and the phenomenon of over-charging or over-discharging of the single batteries is prevented. By arranging the formation clamp, the single batteries can be quickly switched between series connection and parallel connection, the single batteries do not need to be repeatedly clamped up and down, and the batteries are prevented from being damaged.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a fixture and method for forming lithium-ion batteries. Background technique [0002] Compared with other batteries, lithium-ion batteries have the advantages of long cycle, high specific capacity, small self-discharge, wide working range, high voltage and no pollution, so they are widely used in electric vehicles, electric bicycles, electric motorcycles, electric tools and Energy storage systems and other fields. Generally, in order to ensure the normal use of lithium-ion batteries, lithium-ion batteries need to go through a formation process during the production process. [0003] Most of the existing lithium-ion battery formation processes are monomer formation modes, and the formation efficiency is low. Therefore, in order to improve the formation efficiency, there are serial formation processes and parallel formation processes in the market. However, after l...

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Problems solved by technology

[0004] Based on this, the present invention provides a lithium-ion battery formation fixture and method, aiming to solve the problem of the formation process due to the differences in contact resistance and line resistance between the formation fixture and each battery after the lithium-ion batteries are connected in series. During the charging process, the voltage consistency of each battery is poor, which is prone to overcharging, and is not conducive to the production and assembly of lithium-ion batteries.

In addition, when the existing formation fixture is switched between series formation and parallel formation of lithium-ion batteries, it is necessary to repeatedly up and down the lithium-ion battery, which is not only cumbersome, but also has the risk of damaging the lithium-ion battery.

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