A current detection method for redundant current sensor power battery system
A current sensor, power battery technology, applied in the direction of measuring current/voltage, instruments, measuring devices, etc., can solve problems such as increasing the cost of system implementation, and achieve the effect of high reliability
Active Publication Date: 2017-12-05
TONGJI UNIV
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[0004] The above methods to improve system reliability require high-precision sensors, which greatly increase the cost of system implementation, and the cost factor of the power battery system has become an important factor restricting the development of electric vehicles and electric energy storage. A set of cost-reducing current detection redundancy method is proposed in the system design
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[0047] Hereinafter, the present invention will be described in detail by using a lithium-ion power battery system with reference to the drawings and specific embodiments. The following examples will help to understand the present invention, but can not limit the content of the present invention.
[0048] Such as figure 1 As shown, it is a common lithium-ion power battery characteristic model, and the model passes U ocv Describe the open circuit voltage of the battery; resistance R 0 Used to describe the ohmic internal resistance of the battery, R 1 、C 1 and R 2 、C 2 Used to describe the polarization effect of the battery. Considering that replacing the SOC-OCV of the battery with only one capacitor will bring intolerable nonlinear errors, the OCV in the figure is replaced by a nonlinear function, which is a function of the SOC parameter. This nonlinear equivalent circuit model including SOC is composed of a linear part and a nonlinear part, and has passed the verificati...
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The invention relates to a current detection method of a redundant current sensor power battery system, comprising the following steps: 1) counting the error characteristics of the current sensor in the redundant current sensor power battery system; 2) constructing a method according to the dynamic characteristics of the battery and the error characteristics of the current sensor The dynamic model of the power battery system; 3) According to the dynamic model, the current detection error and the current sampling value of the current sensor are estimated by using the online estimation algorithm; 4) According to the current detection error, the sum of the current detection error and the current sensor sampling value is obtained Final current detection value; 5) Determine whether the current sensor is faulty according to the current detection error, if so, replace the current sensor, and return to step 1), if not, return to step 3). Compared with the prior art, the invention has the advantages of high reliability, judging error types, being suitable for redundant design and the like.
Description
technical field [0001] The invention relates to the fields of electric vehicles and electric energy storage, in particular to a current detection method of a redundant current sensor power battery system. Background technique [0002] As a key component, the power battery system is being used more and more in the fields of electric vehicles and electric energy storage. Due to the characteristics of the battery itself, the battery needs to be grouped and managed reasonably during use. The current power In the battery system group, it is necessary to accurately measure the working current, temperature and voltage of the battery, so as to monitor the working state of the battery and provide necessary protection for the battery. [0003] Traditional battery system current measurement is generally implemented by hardware sensors, including current Hall sensors and shunt resistors. In order to improve the reliability of battery systems, redundant design methods are often used in m...
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IPC IPC(8): G01R19/00G01R35/02
Inventor 戴海峰朱乐涛魏学哲孙泽昌
Owner TONGJI UNIV