Multistage constant voltage intermittent charge control method

Abstract

The invention discloses a multistage constant voltage intermittent charge control method for solving the problem that the prior art cannot reasonably control the battery charge. The multistage constant voltage intermittent charge control method comprises the following steps: (1) a charge starting stage; (11) setting a to-be-charged battery type, matching a battery equivalent model; (12) obtaining battery feedback information, computing the maximum initial charge current, and setting an output voltage reference value; (2) a charge regulation stage: (21) performing constant voltage charge using the charge voltage which is no more than the maximum withstanding current of the battery; (22) entering the charge intermittence when the charge current arrives the current charge-stopping current; (23) reducing the voltage to perform the constant voltage charge after maintaining the slot time; (24) repeating the steps (22)-(23) until the battery current arrives the setting value of the charge complete stage; (3) the charge complete stage: using the small charge voltage to perform the constant voltage charge until the electric quantity of the battery is fully charged.

Description

technical field [0001] The technical field of battery management that the present invention relates to, in particular, relates to a multi-level constant-voltage intermittent charging control method. Background technique [0002] With the continuous aggravation of environmental and energy problems, more and more people pay attention to pure electric vehicles with zero emissions. At present, the development of pure electric vehicles is facing a technical bottleneck of driving range, and fast charging is an effective solution. Experts and scholars are looking for breakthroughs in charging control methods. [0003] At present, the charging control methods of on-board chargers mainly adopt three methods: constant voltage charging, three-level constant current charging, and positive pulse charging. Among them, the constant voltage charging is charging at a constant voltage, the charging current will decrease with the increase of the battery power, and the current drop curve gradu...

AI Technical Summary

Problems solved by technology

[0005] (1) For constant voltage charging, if the voltage setting of constant voltage charging is too large, a sharp increase in the initial charging current will be generated, which will cause damage to the battery; if the charging voltage is too low, the charging efficiency will be reduced and the charging time will be prolonged

[0006] (2) For the three-level constant current charging, the charging current curve of the three-level constant current charging can effectively simulate the optimal charging curve, but this method cannot well solve the temperature rise and polarization problems during the battery charging process , and does little to shorten charging time

However, short charging intervals cannot completely eliminate the side effects of battery charging

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