Method and system for online battery state of health estimation
A battery health status and battery technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of high maintenance costs, large changes in algorithm performance, and high maintenance frequency
Active Publication Date: 2019-09-10
GUANGZHOU HKUST FOK YING TUNG RES INST
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Problems solved by technology
Most of the SOH estimation methods actually used in existing projects adopt the method of recalibrating the battery data during regular maintenance, which has high maintenance cost and high maintenance frequency; while most of the SOH methods used in the academic field are based on the electric current inside the battery. Chemical reaction mechanism, or the use of complex nonlinear models and criteria to estimate battery SOH, these methods are complex and the algorithm performance will vary greatly with the type of single battery, not only not suitable for online use, but also consistent Poor sex
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Embodiment 1
[0107] Aiming at the problems of high cost, high complexity and poor consistency of existing battery SOH estimation methods, the present invention proposes a battery state of health (ie SOH) estimation method that is easy to implement online. characteristics, and directly judge the battery SOH. In the present invention, the voltage at the maximum value of the ratio of the battery power change to the open-circuit voltage change during the charging and discharging process of the battery is used as the reference voltage point, and the battery power change and The current available capacity of the battery is used to construct a linear model to estimate the available capacity of the battery, and then determine the battery SOH according to the definition. The method of the invention can effectively estimate the state of health of the battery, and the method of the invention has low complexity, good linearity, and little change in algorithm performance with single batteries.
[0108...
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The invention relates to a battery state of health on-line estimation method and system. The method includes the following steps that: a reference voltage point is obtained according to the circulatory aging test data of a battery, two voltages are selected in the vicinity of the reference voltage point, and the linearity model of the capacity of the battery is constructed according to the two selected voltages and the capacity change of the battery, wherein the reference voltage point is a voltage point at the maximum value of the ratio of the electric quantity change of the battery and open-circuit voltage change in the charging and discharging of the battery; and the current available capacity of the battery is estimated in actual application according to the linear model of the capacity of the battery, and the quotient of the estimated available capacity and the nominal capacity of the battery is adopted as the estimated value of the state of health of the battery. The battery state of health on-line estimation method and system of the invention have the advantages of small cost, low complexity and good consistency, and can be widely applied to the battery management field.
Description
technical field [0001] The invention relates to the field of battery management, in particular to a method and system for online battery health state estimation. Background technique [0002] As of 2009, 61.7% of the world's oil resources were consumed in the field of transportation. In order to protect the environment while saving oil resources, electric vehicles have been developed rapidly. As the only power source for electric vehicles, the cost of power battery packs has reached 30% to 50% of the total price of electric vehicles. During the long-term use of the battery, the decision-making ability of battery maintenance directly determines the speed and cost of battery maintenance, and the battery SOH (state of health, health status) is an important indicator that affects the decision-making ability of battery maintenance, and its online estimation plays an important role. significance. [0003] A battery is a strongly coupled, highly nonlinear system with complex phys...
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IPC IPC(8): G01R31/367G01R31/392
Inventor 唐晓鹏
Owner GUANGZHOU HKUST FOK YING TUNG RES INST