Rapid battery capacity degradation risk assessment method and system
A technology for risk assessment and battery capacity, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems that batteries cannot support life data analysis, battery lithium analysis, etc., and achieve strong versatility, portability, and strong dynamics Sexuality and real-time effects
Active Publication Date: 2021-02-05
BEIHANG UNIV
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Problems solved by technology
In the life cycle test, when the battery capacity dives due to lithium precipitation, the test data of the battery can no longer support the life data analysis. Therefore, it is necessary to detect the diving phenomenon in time before the diving occurs, so as to terminate the test and reduce the cost of the enterprise; in addition , the battery capacity diving means that the battery may have serious lithium analysis, which has a great safety risk. It can be seen that the timely detection of battery capacity diving is extremely important
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specific Embodiment
[0116] The specific embodiment of the present invention adopts the actual lithium-ion battery test data, and uses the diving warning method based on slope ratio and multiple thresholds to carry out diving warning. This part first briefly introduces the data used in the case, then describes the application process of the diving risk warning method based on the slope ratio combined with the actual data, and finally analyzes the test results and the validity and sensitivity of the method.
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The invention discloses a rapid battery capacity degradation risk assessment method and system. The method comprises the following steps: acquiring lithium battery capacity retention rate data of a lithium battery charge-discharge cycle after data preprocessing; according to the obtained lithium battery capacity retention rate data and the corresponding lithium battery charge-discharge cycle number, obtaining a slope value of the lithium battery capacity retention rate data in the lithium battery charge-discharge cycle period; calculating a ratio of a slope value of the lithium battery capacity retention rate data to a slope reference value to obtain a real-time slope ratio; and judging whether the lithium battery capacity degradation risk exists or not according to the obtained real-timeslope ratio and the corresponding threshold interval.
Description
technical field [0001] The present invention relates to the technical field of lithium-ion battery safety, in particular to a method and system for assessing the risk of battery capacity diving. [0002] technical background [0003] Lithium batteries have the characteristics of high energy density, long cycle life, low memory effect, and good safety performance. Military equipment, aerospace and many other fields have been widely used. It can be seen that lithium batteries have become an indispensable part of the energy economy. Large-scale battery fire and explosion incidents have led to widespread doubts about the safety of lithium-ion batteries. In addition to external factors in terms of usage conditions, the safety of lithium-ion power batteries mainly depends on internal factors such as the basic electrochemical system and the structure, design and production process of the electrode / cell, while the electrochemical system used in the cell is The most fundamental fact...
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IPC IPC(8): G01R31/367
CPCG01R31/367
Inventor 马剑宋登巍马梁郝杰王超丁宇吕琛
Owner BEIHANG UNIV