Method for evaluating capacity attenuation degree of lithium ion battery online

A lithium-ion battery, capacity attenuation technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of affecting the normal operation of the energy storage system, increasing the operating cost of the battery energy storage system, and consuming a lot of manpower and material resources, etc. Achieve accurate capacity attenuation, save manpower and material resources, and reduce operating costs

Inactive Publication Date: 2016-07-06
STATE GRID CORP OF CHINA +2
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Problems solved by technology

Although this method can accurately assess the degree of capacity fading of lithium-ion batteries, it will affect the normal operation of the energy storage system due to the need to remove the battery or battery pack from the energy storage system.
At the same time, since the energy storage system is composed of a large number of lithium-ion battery cells or battery packs, it will inevitably consume a lot of manpower and material resources to evaluate the degree of capacity decay of so many cells or battery packs offline. It is equivalent to an additional increase in the operating cost of the battery energy storage system

Method used

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  • Method for evaluating capacity attenuation degree of lithium ion battery online

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Embodiment 1

[0030] Such as figure 1 As shown, the invention of this example provides the method for online evaluation of lithium-ion battery capacity fading degree, and its steps are:

[0031] 1 Research on the relationship between the degree of battery capacity attenuation, the working range of battery capacity and the accumulated processing energy

[0032] When a lithium-ion battery is used in an energy storage system, its depth of discharge (DOD) will not reach 100%, and under different energy storage conditions, the depth of charge and discharge of the battery is also different. Charge and discharge the battery at different depths of discharge, calculate the cumulative processing energy and capacity decay rate of the battery, and establish the relationship between the two. The specific plan is as follows:

[0033] (1) Battery capacity calibration: select more than 30 batteries of the same type, connect the battery to a high-precision charge and discharge detector in an environment o...

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Abstract

The invention relates to a method for evaluating the capacity attenuation degree of a lithium ion battery online. According to the method, the relationships of the capacity attenuation degree and accumulated processing energy of the battery under different charging and discharging depths are established through cyclic tests of the battery under the different charging and discharging depths, and the association relationships are applied to an energy storage monitoring system, and therefore, the on-line evaluation of the capacity attenuation degree of the lithium ion battery can be realized.

Description

Technical field: [0001] The invention relates to a method for evaluating the degree of capacity decay of a battery, and more particularly relates to a method for evaluating the degree of capacity decay of a lithium-ion battery online. Background technique: [0002] At present, the evaluation of the degree of capacity fading of lithium-ion batteries is carried out offline, that is, the battery or battery pack is taken out of the energy storage system, and then connected to a high-precision battery tester, at room temperature (25°C) with a standard The charging and discharging method charges and discharges the battery or battery pack to obtain the capacity of the battery, and compares it with its initial capacity to calculate the capacity decay rate of the lithium-ion battery. Although this method can accurately assess the degree of capacity fading of lithium-ion batteries, it will affect the normal operation of the energy storage system because the battery or battery pack wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 范茂松官亦标王绥军傅凯刘曙光
Owner STATE GRID CORP OF CHINA
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