A non-destructive analysis method for capacity fading of lithium-ion batteries
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 unsuitable battery products
Active Publication Date: 2021-02-19
TIANJIN LISHEN BATTERY +1
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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 dismantling the battery that has completed the phased test, and is not suitable for online testing of battery products.
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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, and 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...
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The invention discloses a non-destructive analysis method for capacity attenuation of lithium-ion batteries, comprising the steps of: step S1, detecting the initial lithium analysis threshold for a fresh battery: performing a preset initial lithium analysis threshold charging test and judgment operation for a battery with capacity attenuation ; Step S2, dynamic detection of the lithium analysis threshold for the battery with capacity fading; step S3, based on the lithium analysis threshold, dynamically analyze the main factors of the capacity fading of the battery: compare the dynamic lithium analysis threshold of the battery with capacity fading with the fresh battery Compared with the initial lithium analysis threshold, according to the preset judgment rules, the main factors of the capacity fading of the battery are judged and obtained. The invention discloses a non-destructive analysis method for capacity fading of lithium-ion batteries, which does not need to disassemble the battery, and mainly analyzes the main factors of the capacity fading of the battery by comparing the lithium analysis threshold before and after the capacity fading of the battery, so as to determine the performance of the battery. Provide basis and direction for improvement.
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...
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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