Matching method implemented by aid of envelope processes

Abstract

The invention discloses a matching method implemented by the aid of envelope processes. The matching method includes a), scanning two-dimensional codes or barcodes arranged on to-be-matched single storage batteries; b), measuring the capacity of the code-scanned to-be-matched single storage batteries by the aid of battery detection systems of capacity grading cabinets and acquiring constant-current discharge capacity data of the single storage batteries; c), uploading the data, obtained after the capacity is measured, to MES (manufacturing execution systems) and automatically generating discharge envelope curves by the aid of the MES by means of fitting; d), aging the qualified to-be-matched single storage batteries, obtained after the qualified to-be-matched single storage batteries passthe step c), under the conditions of high temperatures and high humidity in specified time, carrying out scan tests to acquire voltage and internal resistance data of battery cells and carrying out matching; e), matching the certain to-be-matched single storage batteries. Unqualified products can be identified in procedures at the step b). Abnormal points can be identified by the MES in proceduresat the step c). The discharge envelope curves of the certain to-be-matched single storage batteries are within standard envelope curves, and voltages, internal resistance and the capacity of the certain to-be-matched single storage batteries simultaneously conform to technological design matching requirements. The matching method implemented by the aid of the envelope processes has the advantagesthat the safety performance of lithium iron phosphate battery packs can be improved, and the single storage batteries can be effectively and accurately matched by the aid of the matching method.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to an enveloping method for grouping. Background technique [0002] As the advantages of lithium-ion batteries become more and more obvious, the scope of application is wider and wider, and the use of new energy vehicles is also more and more extensive. At present, the driving force of the electric vehicle industry is to combine several batteries in series and parallel to form a battery. Module, and then several battery modules plus battery management module, battery box and related accessories are combined into a battery pack to form a high-voltage, high-function, high-energy battery system that provides the power source for electric vehicles. However, each single battery will be affected by material characteristics, production conditions, equipment precision and process level during the entire manufacturing process, resulting in differences in the overall...

AI Technical Summary

Problems solved by technology

[0002] As the advantages of lithium-ion batteries become more and more obvious, the scope of application is wider and wider, and the use of new energy vehicles is also more and more extensive. At present, the driving force of the electric vehicle industry is to combine several batteries in series and parallel to form a battery. Module, and then several battery modules plus battery management module, battery box and related accessories are combined into a battery pack to form a high-voltage, high-function, high-energy battery system that provides the power source for electric vehicles. However, each single battery will be affected by material characteristics, production conditions, equipment precision and process level during the entire manufacturing process, resulting in differences in the overall performance of single batteries. Due to the unique characteristics of lithium iron phosphate materials, the platform It is particularly gentle, which leads to the failure of some important indicators in the traditional matching method, which leads to the failure of the traditional matching mode. At present, the lithium iron phosphate battery cells in the industry still use the method of combining single batteries into storage modules. The voltage, capacity, internal resistance, and K value information of the bulk battery are simply graded and grouped. This grouping method cannot accurately group the lithium iron phosphate cells. If there is no new method to combine this Combining single batteries with different performances in series to form a battery module will seriously affect the life of the battery module and even cause safety accidents

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