Nondestructive analysis method for capacity attenuation of lithium ion battery

A lithium-ion battery, capacity decay technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve problems such as online detection of inapplicable battery products

Active Publication Date: 2020-12-18
TIANJIN LISHEN BATTERY +1
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  • Abstract
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Problems solved by technology

[0004] The above analysis method is a destructive analysis method. It can only analyze the cause of attenuation after

Method used

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  • Nondestructive analysis method for capacity attenuation of lithium ion battery
  • Nondestructive analysis method for capacity attenuation of lithium ion battery
  • Nondestructive analysis method for capacity attenuation of lithium ion battery

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Embodiment 1

[0119] In this embodiment, the test sample is a 21700 cylindrical lithium-ion experimental battery, and the battery that has been cycled 300 times at a normal temperature of 25°C ± 2°C is used as a battery with capacity fading. The 1C discharge capacity of the battery with capacity fading is From the initial 4.700Ah attenuation to 4.437Ah, in order to improve the battery cycle performance, it is necessary to analyze the main factors of capacity fading in the cycle process.

[0120] Wherein, the battery test equipment is a conventional charge and discharge instrument, and the equipment used in this embodiment is an Arbin BT2000 charge and discharge test system.

[0121] With the lithium-ion battery capacity decay non-destructive analysis method based on the dynamic analysis of the lithium analysis threshold proposed by the present invention, the main factors of the capacity decay of the battery normal temperature cycle process are analyzed, specifically including the following s...

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Abstract

The invention discloses a nondestructive analysis method for capacity attenuation of a lithium ion battery. The nondestructive analysis method comprises the following steps: S1, detecting an initial lithium precipitation threshold of a fresh battery: carrying out preset initial lithium precipitation threshold charging test judgment operation on the battery with capacity attenuation; S2, dynamically detecting the lithium precipitation threshold of the battery with capacity attenuation; and S3, dynamically analyzing the main factors of the capacity attenuation of the battery based on the lithiumprecipitation threshold: comparing the dynamic lithium precipitation threshold of the battery with the capacity attenuation with the initial lithium precipitation threshold of the fresh battery, andjudging to obtain the main factors of the capacity attenuation of the battery according to a preset judgment rule. According to the nondestructive analysis method for the capacity attenuation of the lithium ion battery, the battery does not need to be disassembled, and the main factors of the capacity attenuation of the battery are analyzed mainly by comparing the lithium precipitation threshold values of the battery before and after the capacity attenuation, so that a basis and a direction are provided for improving the performance of the battery.

Description

technical field [0001] The invention relates to the technical field of performance detection and analysis of lithium-ion batteries, in particular to a non-destructive analysis method for capacity decay of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in mobile phones, notebooks, energy storage components and electric vehicles due to their significant advantages such as high energy density, long cycle life, and being green and pollution-free. At present, various application fields have put forward higher requirements on the service life of batteries. Therefore, it is necessary to analyze the causes of lithium-ion battery capacity attenuation and determine the main factors leading to battery attenuation, so as to provide the basis and direction for improving battery performance. [0003] Current studies believe that the main reasons for the capacity fading of lithium-ion batteries include: the attenuation of positive electrode...

Claims

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Application Information

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IPC IPC(8): G01R31/3835G01R31/389
CPCG01R31/3835G01R31/389
Inventor 周江李慧芳韩江浩陈荣伍绍中
Owner TIANJIN LISHEN BATTERY
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