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Battery health state assessment method, device and related product

A battery health status and health status technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problem of not being able to accurately measure the worst performance of the battery system, so as to facilitate the worst performance, accurately evaluate the worst performance, Evaluate the effect of accurate results

Pending Publication Date: 2021-05-28
NEUSOFT REACH AUTOMOBILE TECH (SHENYANG) CO LTD
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AI Technical Summary

Problems solved by technology

However, the evaluation is usually carried out on the basis of the whole package, often ignoring the most severe conditions in battery use
The lower limit of the performance of electric vehicles depends on the worst performance of the battery system, and the SOH evaluated by the whole pack of batteries often cannot accurately measure the worst performance of the battery system

Method used

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  • Battery health state assessment method, device and related product
  • Battery health state assessment method, device and related product

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Embodiment Construction

[0049] As described above, at present, the whole package is usually tested to evaluate the battery SOH. But the performance of the entire battery system is closely related to the performance of the worst cell during use. Therefore, the current scheme leads to insufficient accuracy of the estimated battery SOH, which affects the application value of the battery SOH evaluation results.

[0050]In order to solve the above problems, the inventor provides a battery state of health assessment method, device and related products after research. Combining the health status of the whole life cycle of the first type battery cell and the second type battery cell obtained through the endurance test respectively, the deviation of the full life cycle health status of the two types of battery cells is obtained. Thereafter, the state of health of the battery is evaluated based on the deviation. By screening the cells and obtaining the SOH deviation at the cell level to assist in evaluating ...

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Abstract

The invention discloses a battery health state assessment method, device and a related product. According to the method, durability tests are respectively carried out on a first type of battery cell and a second type of battery cell, so that the health state of the first type of battery cell with poor durability in the whole life cycle is obtained, and the health state of the second type of battery cell (namely a typical battery cell) in the whole life cycle is obtained. The SOH of the battery is evaluated according to the deviation of the health states of the two battery cells, and compared with the prior art that the SOH of the battery is evaluated only through whole-pack testing, the durability span of the reference battery cell is larger, and the SOH deviation of the battery cell level is obtained. By using the deviation, the evaluation result of the SOH of the whole pack of batteries can be more accurate, so that the worst performance of the battery system can be accurately evaluated.

Description

technical field [0001] The present application relates to the technical field of batteries, in particular to a battery state of health assessment method, device and related products. Background technique [0002] The increasing seriousness of energy crisis, environmental pollution and greenhouse effect has put forward higher requirements for energy saving and emission reduction in the automotive industry. The development of new energy vehicles has almost become an inevitable trend in the transformation of the automotive industry. The power battery is the power source of electric vehicles. In order to ensure the safe, stable and efficient operation of electric vehicles, the necessary management and control of batteries is required. Battery state of health (State of Health, SOH) is an important indicator for evaluating batteries. Accurately grasping the SOH of the battery's full life cycle can provide a basis for battery diagnosis, and also help to replace aging batteries i...

Claims

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Application Information

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IPC IPC(8): G01R31/392G01R31/389
CPCG01R31/392G01R31/389
Inventor 郭江东刘元状贾岩王闰冬
Owner NEUSOFT REACH AUTOMOBILE TECH (SHENYANG) CO LTD
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