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A lithium battery soh estimation method based on internal resistance detection

A technology for lithium batteries and batteries, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem that the SOH estimation of lithium batteries is difficult to take into account the achievability and accuracy at the same time, so as to avoid complex equivalent circuit models and accuracy. and the effect of generalization balance

Active Publication Date: 2021-08-31
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0007] The present invention aims to solve the problem that existing lithium battery SOH estimation is difficult to take into account both the realizability and accuracy, and provides a lithium battery SOH estimation method based on internal resistance detection

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  • A lithium battery soh estimation method based on internal resistance detection
  • A lithium battery soh estimation method based on internal resistance detection
  • A lithium battery soh estimation method based on internal resistance detection

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Embodiment Construction

[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific examples.

[0028] A lithium battery SOH estimation method based on internal resistance detection, such as figure 1 shown, including the following specific steps:

[0029] Step 1: Carry out cyclic charging and discharging experiments on the single sample battery, and collect the internal resistance data during the aging process of the battery through the DC discharge detection method.

[0030] see figure 2 , carry out the aging cycle charge-discharge test on the single sample battery, that is, collect the voltage and current data of the battery during each cycle, and measure the internal resistance and actual battery capacity characteristics of the battery under 80% SOC after a certain number of cycles, The specific process is as follows:

[0031] (1) Battery aging cycle test: Th...

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Abstract

The invention discloses a method for estimating the SOH of a lithium battery based on internal resistance detection. The internal resistance of the lithium battery is detected by a DC discharge method, and related health factor characteristic parameters are obtained. The characteristic parameters can effectively characterize the change trend of the battery health state, and establish The RBF neural network model of the battery health factor and the actual state of health avoids the establishment of a complex equivalent circuit model, and the accuracy and generalization of SOH estimation can be balanced.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery SOH estimation method based on internal resistance detection. Background technique [0002] Lithium batteries will inevitably age during use, which is manifested in the attenuation of battery capacity and the increase of internal resistance. At present, battery health estimation functions have been gradually added to mobile phone lithium batteries and electric vehicle power battery packs. Lithium battery state of health (SOH, State of Health) characterizes the ability of the current battery to store electrical energy and energy relative to a new battery, and is an indicator to quantitatively describe the performance state of the battery. SOH parameters can affect many aspects such as battery SOC estimation, battery charging and discharging strategy setting, battery pack balancing control, and battery fault diagnosis. Therefore, accurate SOH estimatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/392G01R31/389
CPCG01R31/389G01R31/392
Inventor 张向文程鹏党选举莫太平伍锡如任风华李晓赵学军杨睿
Owner GUILIN UNIV OF ELECTRONIC TECH
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