Lithium-ion battery matching method and lithium-ion battery matching system

Abstract

The invention provides a lithium-ion battery matching method and a lithium-ion battery matching system and relates to the technical field of lithium battery production technologies. The lithium-ion battery matching method comprises the steps of battery encoding, first battery grading, second battery grading, first normal temperature testing of batteries, second normal temperature testing of the batteries, internal resistance testing of the batteries and step matching of the batteries. The technical problems that a single-parameter matching method is single in basis and large in error, a multi-parameter matching method cannot present essential differences among the batteries and is poor in balance, and a method of combining the multi-parameter matching method with a charge-discharge curve matching method is complicated in operation process and low in production efficiency are solved. According to the lithium-ion battery matching method, the matched batteries are better in uniformity, the charge-discharge cycle performance is improved, furthermore, other parameters do not need to be tested in the scheme, the influence of the charged state is avoided during matching, and matching canbe carried out in the charged state of an arbitrary low-power battery pack.

Description

technical field [0001] The invention relates to the technical field of lithium battery production, in particular to a lithium ion battery assembly method and a lithium ion battery assembly system. Background technique [0002] Electric vehicles have high requirements on the power and energy of the power source. The single batteries need to be combined accordingly to provide greater power and energy. In theory, it is required that the internal resistance, capacity and other parameters of these batteries should be as consistent as possible. This maximizes the power released by the battery. Due to the influence of production conditions, manufacturing environment, material characteristics, production equipment and other factors, there will be some differences in performance parameters of multiple single cells that are actually combined, such as: rated capacity of single cells, open circuit voltage of single cells , monomer charging voltage platform, monomer discharge voltage pl...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide lithium-ion battery grouping method, to alleviate existing in the prior art, adopt the mode of single-parameter grouping method to be based on single, error is big, adopt the mode of multi-parameter grouping method to be unable to make the difference between batteries The essential difference is presented, the balance is poor, and the combination of multiple parameter matching and charge-discharge curve matching method is used. The operation process is complicated and the production efficiency is low.

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