Lithium battery SOC and SOH collaborative estimation method considering influence of cycle index

A cycle number, lithium battery technology, applied in calculation, measurement of electricity, measurement of electrical variables, etc., can solve problems affecting the estimation accuracy of battery SOC and SOH

Pending Publication Date: 2020-08-25
XIAN UNIV OF TECH
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Problems solved by technology

[0005] However, as the battery is cycled, battery parameters, including capacity and impedance, will change as the battery degrades, thus affecting the algorithm's estimation accuracy of battery SOC and SOH

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  • Lithium battery SOC and SOH collaborative estimation method considering influence of cycle index
  • Lithium battery SOC and SOH collaborative estimation method considering influence of cycle index
  • Lithium battery SOC and SOH collaborative estimation method considering influence of cycle index

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Embodiment Construction

[0104] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific implementations described in this specification are only for explaining the present invention, not for limiting the present invention.

[0105] The invention discloses a lithium battery SOC and SOH collaborative estimation method considering the influence of the number of cycles, and the realization process is as follows figure 1 As shown, it specifically includes the following steps:

[0106] Step 1, constructing an equivalent circuit model of a lithium battery considering the number of cycles;

[0107] The general second-order RC equivalent circuit model has been widely used in power battery modeling and state estimation due to its advantages of high computational efficiency, easy engineering implementation, and good battery dynamic behavior simulation. However, as the battery is cycled, especially ...

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Abstract

The lithium battery SOC and SOH collaborative estimation method considering the influence of the cycle index comprises the following steps: step 1, constructing a lithium battery equivalent circuit model considering the cycle index; 2, identifying model parameters; 3, performing simulation verification on the model established in the step 1; and step 4, constructing an SOC / SOH cooperative estimator. According to the method disclosed by the invention, estimation of the state of charge (SOC) and the state of health (SOH) of the lithium battery in the whole life range can be finally realized,. The method is of great significance to state estimation and energy management of an electric vehicle battery management system, solves the problem of large state estimation errors caused by inaccurate models due to different life cycles, effectively improves the utilization efficiency of a power battery pack, and ensures the service life of the battery pack.

Description

technical field [0001] The invention belongs to the technical field of power battery management systems, and in particular relates to a lithium battery SOC and SOH collaborative estimation method considering the influence of cycle times. Background technique [0002] With the vigorous development of the electric vehicle market, lithium batteries have been widely used as the power source of electric vehicles. In order to ensure the safe and reliable operation of the battery pack, it needs to be well monitored, controlled and managed by the battery management system (Battery management system, BMS). For the battery management system, the core function is to provide accurate estimation of the state-of-charge (SOC) and state-of-health (SOH) of the battery, which is a huge challenge. Since the existing on-board sensors cannot observe these two states, it is necessary to develop a feasible state estimation algorithm. [0003] State-of-charge is a key factor in the remaining capa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/367G01R31/367G01R31/392G06F111/10
CPCG01R31/367G01R31/392G06F30/367G06F2111/10
Inventor 庞辉牟联晶武龙星郭龙晋佳敏
Owner XIAN UNIV OF TECH
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