Lithium battery state-of-health estimating and updating method

A technology of health status and update method, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of poor practicability of health status estimation, and achieve the effect of easy implementation and simple estimation method

Active Publication Date: 2016-10-12
ANHUI RNTEC TECH CO LTD
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Problems solved by technology

[0004] The object of the present invention is to provide a method for estimating and updating the state of health of a lithium battery. The method for estimating and updating the state of health of a lithium battery overcomes the problem of poor practicability in estimating the state of health of a lithium battery in the prior art. The initial SOC of the battery accurately estimates the SOH state of the battery

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  • Lithium battery state-of-health estimating and updating method
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  • Lithium battery state-of-health estimating and updating method

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Embodiment Construction

[0021] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0022] The present invention provides a method for estimating and updating the state of health of a lithium battery. The method for estimating and updating the state of health of a lithium battery includes:

[0023] Step 1, judging whether the lithium battery is being charged, and performing step 2 in the state of charging; otherwise, the health status of the lithium battery is not updated;

[0024] Step 2, judging that the battery state of charge value of the lithium battery is less than the preset initial battery state of charge value SOC 0 In the case of , perform step 3; otherwise, do not update the state of health of the lithium battery;

[0025] Step 3, ...

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Abstract

The invention discloses a lithium battery state-of-health (SOH) estimating and updating method comprising the following steps: S1, judging whether a lithium battery is being charged, executing S2 if the lithium battery is being charged, or, not updating the SOH; S2, executing S3 when judging that the battery state-of-charge (SOC) value of the lithium battery is smaller than a preset initial battery SOC value, or, not updating the SOH; and S3, judging whether the lithium battery is fully charged when charging ends, calculating the SOH of the lithium battery according to a formula (SOH<Q>=Q / C0=delta(Q) / (1-SOC0)*C0) and updating the SOH of the lithium battery under the condition that the lithium battery is fully charged, or, not updating the SOH under the condition that the lithium battery is not fully charged, wherein SOC0 is the initial battery SOC value, Q is the total capacity of charging of a battery pack, C0 is the nominal capacity of the battery, delta(Q) is the capacity change of the battery from the initial battery SOC to the fully-charged state, and SOH<Q> is the SOH of the lithium battery. Through the lithium battery SOH estimating and updating method, the SOH of a battery can be estimated accurately based on the initial SOC of the battery.

Description

technical field [0001] The present invention relates to the field of estimating strategy of the state of health, in particular to a method for predicting and updating the state of health of a lithium battery. Background technique [0002] With the large-scale use of lithium batteries in electric vehicles and energy storage systems, people are paying more and more attention to the attenuation characteristics and state-of-health (SOH) estimation of lithium batteries. State of health estimation is one of the core issues in lithium battery parameter estimation and system application. It has a very important impact on electric vehicles to predict the remaining life of the battery, judge the remaining capacity and estimate the cruising range. [0003] At present, the research on battery state of health estimation generally consists of two methods, one is to predict battery SOH by measuring the internal material changes of lithium batteries, such as the growth of SEI film, the chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/392
Inventor 曾国建蔡华娟颛孙明明范晓东余铿
Owner ANHUI RNTEC TECH CO LTD
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