A power battery soh estimation method
A battery and lithium battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of obtaining batteries, wasting manpower and financial resources, etc., and achieve the effect of strong anti-interference ability
Active Publication Date: 2016-02-03
深蓝汽车科技有限公司
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[0004] Since the health status of the battery is related to various factors such as battery internal resistance, charge and discharge capacity, and self-discharge, it is possible to obtain the SOH value of the battery through tests in the laboratory, but there are no laboratory conditions during the use of the battery. Therefore, it is impossible to directly obtain the SOH value of the battery through the measurement method. If the battery of the electric vehicle is recycled to the laboratory for SOH value measurement, a lot of manpower and financial resources will be wasted. Human and financial methods, so many battery management system developers are currently developing SOH estimation methods, but there is no mature method applied to products
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[0036] In order to facilitate the understanding of those skilled in the art, the following in conjunction with the attached figure 1 and specific implementation examples to describe the implementation of the present invention.
[0037] The method that the embodiment of the present invention proposes comprises the following steps:
[0038] Step 1: Establish the following state space model based on the power battery circuit model and use the Kalman filter algorithm in the system identification method to identify system parameters:
[0039]
[0040] V B (k)=OCV(k)-R 0 (k)I B (k)-V p (k)+v(k)(2)
[0041] In formula (1) is the state noise; v is the measurement noise; V p is the battery polarization voltage; OCV is the battery open circuit voltage; R o is the internal resistance of the battery; C B is the actual capacity of the battery. V in formula (2) B is the terminal voltage of the battery, and the open circuit voltage OCV is a function of the battery state of cha...
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The invention provides a lithium battery SOH estimation method. According to the lithium battery SOH estimation method, a system parameter estimation method is used for estimating the actual capacity and Ohm internal resistance of a battery; a redundancy processing method is used for processing the estimated actual capacity and Ohm internal resistance; the actual capacity and the Ohm internal resistance are used for estimating the health state of the battery respectively, and a true health state of the battery is obtained by means of weighting the relation between the actual capacity and the Ohm internal resistance; a smoothing weighting method is used for processing the health state value of the battery. By means of the lithium battery SOH estimation method, the purpose of accurately reflecting the true health state of the battery can be achieved.
Description
technical field [0001] The invention belongs to the field of battery management systems for new energy vehicles, and relates to a method for estimating the State of Health (SOH) of a power battery. Background technique [0002] High-efficiency, energy-saving, and environmentally friendly electric vehicles have attracted people's attention and achieved great development in today's deteriorating environment and depletion of petroleum energy. Therefore, accurate estimation of the state of health (SOH, StateofHealth) of the power battery is important for the entire control strategy of electric vehicles. The further optimization and further development of electric vehicles are particularly important. [0003] With the passage of time and the use of the battery, the battery ages, resulting in different battery characteristics in different periods, which is specifically reflected in the SOH value of the battery. Therefore, the SOH value intuitively reflects the overall performance ...
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IPC IPC(8): G01R31/36
Inventor 赵天林姚振辉邓柯军刘波杨辉前郑英张友群苏岭周安健
Owner 深蓝汽车科技有限公司