Charging method of lithium ion battery

Abstract

The invention discloses a charging method of a lithium ion battery. The charging method comprises the following steps: establishing an equivalent circuit model of the lithium ion battery through a neural network; coupling a heat transfer model on the basis of the equivalent circuit model to establish an initial electric-thermal coupling model; designing a plurality of groups of constant-current charging schemes; testing a battery to be detected according to the constant-current charging schemes so as to obtain a plurality of groups of testing data; designing a plurality of groups of multi-phase charging schemes and inputting the plurality of groups of multi-phase charging schemes meeting constraint conditions of a multi-target optimization model into a target electric-thermal coupling model in sequence, so as to obtain result data; carrying out iterative optimization on the result data based on the multi-target optimization model and selecting one group of Pareto optimal solution from the plurality of groups of multi-phase charging schemes as a charging scheme for selecting; and selecting a target charging scheme from the charging scheme for selecting through a decision-making scheme. According to the charging method disclosed by the invention, the optimal charging scheme can be provided for battery charging by utilizing limited experiment times.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a charging method for lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high battery voltage, large specific capacity, low self-discharge effect, long cycle life, and no memory effect in secondary batteries. They are the best secondary batteries used in portable electronic devices and electric vehicles. type. However, lithium-ion batteries also have shortcomings such as easy overcharging and obvious aging, and there are certain safety issues when using them. In the process of work, it is necessary to scientifically and effectively control battery parameters and design a suitable charging strategy to ensure safe and efficient operation of the battery. [0003] The charging strategy of the battery is a comprehensive issue. In order to increase the charging efficiency, the charging current must be increased; a large charging current...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome that the charging method of lithium-ion batteries in the prior art either adopts constant current charging, or designs the value of multi-stage constant current charging through experience so that it cannot meet the requirements of energy saving, consumption reduction, and charging rate improvement. Defect, provide a kind of charging method of lithium-ion battery

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