Equalization circuit, design method thereof and battery management system

Abstract

The invention provides an equalization circuit, a design method thereof and a battery management system, and the equalization circuit comprises a control sub-circuit which comprises a control end, a first end and a second end, wherein the control end is used for accessing a control signal, and the control signal is used for controlling the conduction state between the first end and the second end;a first series branch which comprises a first equalizing resistor and a first thermistor which are connected in series, wherein the first series branch is connected between the first end and the signal input end of a first battery monomer in the battery module in series; and a second series branch which comprises a second equalizing resistor and a second thermistor which are connected in series,wherein the second series branch is connected between the second end and the signal input end of a second battery monomer in the battery module in series. Thus, if the current of the series branch isincreased to cause the temperature rise of the equalizing resistor, the resistance value of the thermistor is quickly increased along with the temperature rise so that the current in the series branch is reduced, the temperature of the equalizing resistor is also reduced, and the thermal protection of the battery module is realized.

Description

technical field

[0001] The invention relates to the technical field of control, in particular to an equalizing circuit, a design method thereof, and a battery management system. Background technique

[0002] Nowadays, cars are very popular, especially electric cars. Therefore, the safety of battery modules is related to the safety of cars. In the equalization circuit of the existing battery module, the realization of the equalization function is realized by controlling the on-off of the internal integrated control element by the analog front-end, so when the control element is overvoltage or other reasons cause breakdown, it will lead to a large current Flowing through the equalizing resistor causes the temperature of the equalizing resistor to rise. After the equalizing resistor continues to heat up to a certain extent, it will cause the battery to catch fire on your circuit board, which will affect the safety of the battery module and even the car.

[0003] It can be seen...

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