Method for estimating battery state of health and battery management device

A battery health status and battery technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of uncertainty, time-consuming, difficult to implement, etc., and achieve easy implementation, good real-time performance, and short time-consuming Effect

Active Publication Date: 2022-01-18
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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  • Method for estimating battery state of health and battery management device
  • Method for estimating battery state of health and battery management device
  • Method for estimating battery state of health and battery management device

Examples

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Embodiment 1

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

[0044] Step S01, a relationship curve of the internal resistance of the battery cell library of the SOH.

[0045] Since the internal resistance of the battery is not constant, it will continue to change during charge and discharge over time, especially after the projection of the battery performance and failure aging resistance increases, therefore by the internal resistance of the battery can quickly determine the extent of aging of the battery. figure 2 Examples given graph SOH of the battery internal resistance of the battery embodiment of a relationship, such as figure 2 Shown, corresponding to the internal resistance of the battery it is different at different SOH. In this step, internal resistance in the battery fitting curve of the SOH stored in the database, so as to establish the internal battery resistance curve library S...

Embodiment 2

[0070] In the present embodiment, on the basis of an embodiment, to estimate the lithium iron phosphate storage battery pack system as an example, there is provided a specific application scenario of the method of estimating battery state of health. The present embodiment provides a battery management system, the battery control unit to monitor the lithium iron phosphate energy storage system has been running for six months, wherein the battery pack of lithium iron phosphate energy storage system specification for 48V-50Ah, the battery pack and the internal resistance r The graph of SOH figure 2 Shown; scheduled power storage system of the lithium iron phosphate as curve image 3 Indicated.

[0071] like Figure 4 Battery management apparatus 1 includes a database 10, a first SOH data acquisition unit 11, the second SOH SOH data acquisition unit 12 and operation unit 13 estimates.

[0072] Wherein, the database 10 stores the SOH of the battery cell internal resistance and the batter...

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Abstract

The present invention provides a method for estimating the state of health of a battery online and a battery management device capable of estimating the state of health of a battery, which can calculate the remaining life of the battery according to the number of energy exchanges, and then use the relationship curve between internal resistance and battery SOH as an auxiliary to perform simple, Effective estimation can fully meet the accuracy requirements of battery SOH estimation. At the same time, it can be measured without standing the battery for a long time. It takes a short time, has good real-time performance, and is easy to implement. It can be extended to battery packs and even energy storage systems. Estimation of lifespan.

Description

Technical field [0001] The present invention relates to a battery management, and in particular relates to a method and apparatus for estimating a battery management battery state of health. Background technique [0002] With the battery in electric vehicles, power plants and other energy storage applications more widely, the battery management more and more attention; which, estimated battery state of health (State of Health, SOH) of battery management is not available a ring neglected, the SOH of the battery parameters of the battery with a new standard of comparison, the ability to measure the battery storage and delivery of electrical energy, the battery can be described with the maximum degree of attenuation amount of discharge, the electric vehicle control and improve the mileage performance prediction or energy storage station grid scheduling response are of great significance. [0003] Current battery SOH estimating method for online direct discharge method and the equiva...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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