Energy supplement type battery equalization device and equalization method thereof

Abstract

The invention discloses an energy supplement type battery equalization device and an equalization method thereof, the energy supplement type battery equalization device comprises a charging input port and a processor, the charging input port is electrically connected with a non-isolated step-down circuit, the non-isolated step-down circuit is connected with N isolated step-down circuits, the N isolated step-down circuits are respectively connected with corresponding N constant-current voltage-limiting equalization circuits, and the N constant-current voltage-limiting equalization circuits are connected with the processor. The N constant-current voltage-limiting equalization circuits are respectively connected with the corresponding Nth battery cell, and the N constant-current voltage-limiting equalization circuits are all connected with the processor; the voltage of the battery cell is detected in real time through the processor, and once it is detected that the maximum voltage difference of the battery cell exceeds an equalization voltage difference threshold value, the equalization circuit is started until the equalization time is reached. According to the energy supplement type battery equalization device and the equalization method thereof disclosed by the invention, the equalization efficiency can be improved, the energy loss is reduced, the charging efficiency is further improved, and meanwhile, the current detection circuit is added, so that the circuit safety is effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to an energy supplementary battery balancing device and a balancing method thereof. Background technique [0002] General battery equalization is divided into active equalization and passive equalization. Among them, passive equalization generally releases the "excess power" of high-capacity batteries by means of resistance heat dissipation, so as to achieve the purpose of equalization, but because the consumed energy is basically transformed into For heat energy, all such equalization generally has low power per unit time, and considering the heat dissipation and volume of the BMS board, a single battery cell generally does not exceed 0.3W, so the equalization efficiency is also low and energy loss is large; active equalization charging Transfer excess power to high-capacity cells when discharging, and transfer excess power to low-capacity cells when discharging, which c...

AI Technical Summary

Problems solved by technology

However, there are still the problems of low equalization efficiency and large energy loss of the above-mentioned passive equalization

[0004] Patent document WO2018086459A1 discloses a method and circuit for equalizing charging and discharging of series battery packs, and a DC isolation step-down circuit, which is essentially an evolved version of capacitive active equalization. The equalized energy absorption stage comes from an external power source, but this equalization method requires continuous energy absorption. , and then release the electric energy, so the switches need to be switched frequently, and some switches are required to be opened synchronously, which greatly increases the complexity of the system and the complexity of the control, and this equalization method is not a constant current and constant voltage method, which will lead to Impulse current appears at the moment of releasing electric energy, which accelerates the attenuation and aging of the battery core

[0005] At the same time, the equalization method in the prior art can only equalize one battery cell at the same time, and the efficiency is low; and the equalization device in the prior art has no circuit and strategy to detect faults, and cannot guarantee the safety of the circuit

Images