Power battery charge state estimating device and method

Abstract

The invention discloses power battery charge state estimating device and method. The device comprises a storage battery and a storage battery ECU. The storage battery comprises a plurality of battery modules serially connected. Each battery module comprises a plurality of single batteries serially connected. The storage battery ECU comprises a voltage measuring unit, a current measuring unit, a temperature measuring unit, an electromotive force calculating unit, an accumulation current coefficient correcting unit, an accumulator, an SOC estimating unit, a charging efficiency calculating unit and a polarization voltage estimating unit. By the different calculating methods of the battery under polarization voltage of different states, the electromotive force of the battery can be obtained accurately, and estimation accuracy of SOC can be guaranteed.

Description

technical field

[0001] The invention belongs to the technical field of hybrid electric vehicle battery management, and relates to a device for estimating the state of charge of a power battery with high approximation degree and high estimation accuracy. Background technique

[0002] In recent years, due to many reasons such as energy crisis, environmental pollution and energy security, many countries have begun to pay attention to energy conservation and emission reduction and the development of low-carbon economy. Hybrid vehicles are transitional products between engine vehicles and pure electric vehicles, which can solve the problems of driving range and environmental pollution at the same time. At present, hybrid vehicles in many countries have achieved mass production.

[0003] In a hybrid vehicle, when the output power of the engine is greater than the power required to drive the wheels, the excess energy is used to drive the generator and charge the battery; when the o...

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