A battery capacity diving risk assessment method and system
A battery capacity and risk assessment technology, 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: 2022-01-28
BEIHANG UNIV
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Problems solved by technology
In the life cycle experiment, 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 test data of the lithium-ion storage battery, and applies the diving warning method based on the slope ratio and multiple thresholds to carry out the 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 in combination 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 battery capacity diving risk assessment method and system, comprising: acquiring lithium battery capacity retention rate data of lithium battery charging and discharging cycle after data preprocessing; and according to the acquired lithium battery capacity retention rate data and corresponding lithium The number of battery charge and discharge cycles is obtained to obtain the slope value of the lithium battery capacity retention rate data during the lithium battery charge and discharge cycle; calculate the ratio of the slope value of the lithium battery capacity retention rate data to the slope reference value to obtain a real-time slope ratio; The obtained real-time slope ratio and the corresponding threshold interval can be used to determine whether there is a risk of lithium battery capacity diving.
Description
technical field [0001] The 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 factor that ...
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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