On-line parameter identification and soh estimation method for lithium-ion battery based on temperature parameter
A lithium-ion battery, temperature parameter technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problem of not considering the influence of temperature parameter estimation results, etc.
Active Publication Date: 2019-10-18
ZHEJIANG UNIV CITY COLLEGE
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In summary, the current state estimation methods for lithium batteries do not consider the influence of temperature parameters on the estimation results.
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[0066] The present invention will be further described below in conjunction with the examples. The following examples are provided only to aid the understanding of the present invention. Those skilled in the art can make improvements to the present invention without departing from the principles of the present invention, and these improvements also fall within the protection scope of the claims of the present invention.
[0067] The algorithm flow chart of the lithium-ion battery online parameter identification and SOH estimation method based on temperature parameters is as follows: figure 1 Shown: (1) The input quantity is the equivalent circuit terminal voltage U 0 and terminal current I 0 , the output is the estimated value of the open circuit voltage of the equivalent circuit and battery health status SOH, both outputs are compensated and corrected by temperature parameters; (2) two important calculation modules are the state space observer and the online parameter ide...
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The invention relates to a lithium-ion battery online parameter recognition and SOH (state of health) estimation method based on temperature parameter, comprising battery parameter online recognition,and SOH estimation and temperature compensation; inputs include equivalent circuit end voltage U0 and end current I0, and outputs include equivalent circuit open-circuit voltage estimated value and battery state of health SOH, and both the two outputs are subjected to temperature parameter compensating correction; two important calculating modules include a state space observer and an online parameter recognition module that function to perform equivalent circuit state estimation and parameter calculation respectively. The method provided herein carries out temperature compensation for each input, and three compensation modules are provided. The method has the advantages that the state space estimation method is more popularizable and applicable by combining temperature parameter T; by introducing the state space observer, complexity of the estimation algorithm is decreased, and the analytical process stability is enhanced; by introducing Lyapuov's direct process, the reliability of closed-loop estimation results is guaranteed.
Description
technical field [0001] The invention relates to a method for estimating the state of health of a lithium ion battery based on a state space estimator, more specifically, it relates to an online parameter calculation and SOH estimation method for a lithium ion battery based on a temperature parameter. Background technique [0002] The establishment of a lithium-ion battery model and the accurate estimation of model parameters, as well as the estimation of the state of charge (SOC) and state of health (SOH) of the battery based on the model parameter values, are crucial to improving the working performance and working life of lithium-ion batteries. In the lithium battery state estimation method, the basic method is the ampere-hour equilibrium algorithm, also known as the Coulomb counting method, which has the disadvantages of error accumulation and estimation drift. The second is the state estimation method based on the open circuit voltage (OCV), which is only suitable for th...
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IPC IPC(8): G01R31/367G01R31/392
Inventor 汪秋婷戚伟肖铎周选昌
Owner ZHEJIANG UNIV CITY COLLEGE