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Power battery charge state estimating device and method

A state of charge, power battery technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of insufficient battery accuracy and inability to estimate SOC online

Inactive Publication Date: 2014-03-26
BEIHANG UNIV +1
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Problems solved by technology

[0007] In the prior art, to obtain the terminal voltage V 0 , the battery needs to stand for a long time and the accuracy is not enough, and the SOC cannot be estimated online; in addition, when the battery is in different states, the change of the polarization voltage is also different, and it cannot be obtained uniformly by one calculation method

Method used

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  • Power battery charge state estimating device and method
  • Power battery charge state estimating device and method
  • Power battery charge state estimating device and method

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] The device for estimating the state of charge of the power battery in the present invention is as follows: figure 1 As shown, including battery 10a and battery ECU10;

[0024] In order to ensure the output power of the motor, the battery 10a includes a plurality of battery modules connected in series, and each battery module includes a plurality of battery cells connected in series, and the batteries used are all NiMH batteries.

[0025] The battery ECU 10 is used to observe the state of charge of the battery 10a and control the charging and discharging process of the battery.

[0026] The battery ECU 10 includes a voltage measurement unit 11, a current measurement unit 12, a temperature measurement unit 13, an electromotive force calculation unit 14, an accumulated current coefficient correction unit 15, an accumulator 16, an SOC estimation unit 17, a chargi...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 杨世春麻翠娟李明李执中周剑文
Owner BEIHANG UNIV
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