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Battery state of health estimation method and battery management device

A battery health state and battery technology, applied in the method and battery management device, the field of estimating the battery health state, can solve the problems of uncertainty, time-consuming, difficult to implement, etc., and achieve easy implementation, short time-consuming, and good real-time performance. Effect

Active Publication Date: 2019-08-16
珠海东帆科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the direct discharge method requires the battery to stand for a long time before it can be measured, which takes too long, cannot be used for real-time estimation, and is not easy to implement; the equivalent circuit model method requires an appropriate battery model and accurately measured parameters, and requires a large Scale computing power and precise initialization can ensure the accuracy of the valuation. It is highly targeted. For different batteries, the model has uncertainty, and it is not easy to expand to other batteries, so it is not suitable for practical application scenarios.

Method used

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  • Battery state of health estimation method and battery management device
  • Battery state of health estimation method and battery management device
  • Battery state of health estimation method and battery management device

Examples

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Embodiment 1

[0043] This embodiment proposes a method for estimating the battery state of health (SOH), such as figure 1 shown, including the following steps:

[0044] Step S01, establishing a library of relationship curves between battery internal resistance and battery SOH.

[0045] Since the internal resistance of the battery is not constant, it will change with time during the charging and discharging process, especially after the battery ages and fails, the internal resistance will increase. Therefore, the aging degree of the battery can be quickly judged by the internal resistance of the battery. figure 2 A curve diagram of the relationship between the internal resistance of the battery and the SOH of the battery in an embodiment is given, such as figure 2 As shown, the internal resistance of the corresponding battery under different SOH is different. In this step, the fitting curve of the internal resistance of the battery and the SOH is stored in the database, thereby establish...

Embodiment 2

[0070] Based on the first embodiment, this embodiment provides a specific application scenario of the method for estimating the state of health of the battery by taking the estimation of the battery pack in the lithium iron phosphate energy storage system as an example. This embodiment provides a battery management device. The lithium iron phosphate energy storage system monitored by the battery management device has been in operation for half a year. The battery pack specification of the lithium iron phosphate energy storage system is 48V-50Ah, and the internal resistance r of the battery pack is equal to The SOH relationship curve is as follows figure 2 Shown; the power dispatch curve of the lithium iron phosphate energy storage system is as follows image 3 shown.

[0071] Such as Figure 4 As shown, the battery management device 1 includes a database 10 , a first SOH data acquisition unit 11 , a second SOH data acquisition unit 12 and an SOH estimation calculation unit ...

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Abstract

The invention provides an online battery state of health estimation method and a battery management device capable of estimating the battery state of health. The remaining service life of the batterycan be calculated according to the energy exchange times, and the SOH of the battery can be simply and effectively estimated by taking a relation curve of the internal resistance and the SOH of the battery as an auxiliary means, and the requirement of the SOH estimation accuracy of the battery can be fully met; meanwhile, the battery does not need to be subjected to long-time standing, and the state of health can be estimated; and the time consumption is short, the real-time performance is high, the implementation is easy, and the method can be expanded to estimation of the service life of a battery pack and even an energy storage system.

Description

technical field [0001] The invention relates to the field of battery management, in particular to a method for estimating the state of health of a battery and a battery management device. Background technique [0002] As power batteries are more and more widely used in electric vehicles, power station energy storage, etc., more and more attention is paid to battery management; among them, the estimation of battery state of health (State of Health, SOH) is an indispensable part of battery management. A neglected link, the SOH parameter of the battery takes the new battery as the comparison standard, measures the ability of the battery to store and transmit electric energy, describes the attenuation degree of the battery's maximum dischargeable power, and predicts the improvement of the control performance of the electric vehicle and the mileage or the energy storage power station. Response to grid dispatch is of great significance. [0003] At present, there are direct disch...

Claims

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Application Information

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IPC IPC(8): G01R31/392G01R31/389G01R31/367
CPCG01R31/392G01R31/367G01R31/389
Inventor 苏大亮周传健刘格格
Owner 珠海东帆科技有限公司
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