Cascaded battery grouping system of electric automobile and control method

Abstract

The invention discloses a cascaded battery grouping system of an electric automobile and a control method. The cascaded battery grouping system comprises an energy storage energy module and a power energy module which are cascaded, wherein after being cascaded, the energy storage energy module and the power energy module are connected with an electric automobile motor controller; at least one energy storage energy module is arranged and comprises an energy storage battery and an opposite connection isolation circuit; the opposite connection isolation circuit can be used for oppositely connecting or separating the energy storage battery; at least one power energy module is arranged and comprises a power battery and a variable-power output / input circuit; the variable-power output / input circuit is used for boosting output of the power battery and charging the power battery; the opposite connection isolation circuit and the variable-power output / input circuit are connected with a main controller. According to the cascaded battery grouping system disclosed by the invention, a bus can be initiatively isolated from each bundle of the batteries, so that the battery can be isolated to stopcharging and discharging or the battery is oppositely connected to be charged and discharged when certain bundle of the batteries are not consistent, and furthermore, the aim that the batteries of a whole battery pack is balanced is realized.

Description

technical field [0001] The invention relates to the technical field of electric vehicle battery grouping systems, in particular to an electric vehicle series variable battery grouping system and a control method. Background technique [0002] At present, the battery pack scheme commonly used in electric vehicles is battery series, parallel or series-parallel combination, among which the series-parallel combination scheme is the most common. Although the structure of this scheme is simple, its disadvantages cannot be ignored. [0003] In the series-parallel combination scheme, the performance of the battery is required to be highly consistent, that is, the consistency of the battery is required to be high. However, the battery processing technology will inevitably lead to differences in battery performance in actual production. Improving battery consistency requires higher requirements for battery equipment, personnel, technology, processes, etc., which will greatly increas...

AI Technical Summary

Problems solved by technology

However, this solution generates serious heat and wastes energy. On the contrary, it leads to a decrease in the cruising range of the car from another angle, and also faces the problems of low equalization efficiency and poor equalization effect.

Images