Method for identifying degeneration of lithium battery and degeneration warning system
An alarm system, lithium battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., to achieve the effect of avoiding user losses
Active Publication Date: 2016-12-07
杭州巴特瑞新能源科技有限公司
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The cycle life usually reaches thousands or even tens of thousands of times, so it is difficult to prove such a "cycle number" in a short time
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[0042] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0043] The basic train of thought of the design of the present invention is as follows:
[0044] The State of Degeneration (SOD) of the battery can usually be judged by comprehensive analysis of parameters such as the open circuit voltage of the battery, the ambient temperature of the battery, the discharge rate of the battery, and the released capacity. However, the above factors are highly coupled with each other, and it is difficult to separate them. Therefore, an adaptive neuro-fuzzy system is considered to establish the relationship between them and SOD.
[0045] Considering that corresponding to a fully charged battery, there will be a corresponding discharge capacity under a certain open circuit voltage, ambient temperature and discharge rate, and this discharge capacity will reflect the degree of degradation of the battery, that is: the more capacity...
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The invention discloses a method for identifying degeneration of a lithium battery and a degeneration warning system. The method adopts the analysis method of the degree of discretization of array, and considers a plurality of physical quantities as one array so as to identify the stage of discretization of the array. The physical quantities include the over-circuit voltage of a battery and the environment temperature of the battery, the discharge rate of the battery, and the capacity discharged by the battery. The system detects working current or the current, the voltage and the temperature of a battery pack by a detection apparatus, calculates the discharge capacity and the over-circuit voltage and the environment temperature prior to the discharge on the basis of the average discharged current and the accumulation of discharge time; transmits the discharge capacity, the over-circuit voltage and the environment temperature to an upper computer for conducting degeneration coefficient calculation and transmits the calculation value to a lower computer, and if the degeneration coefficient exceeds a threshold value, gives a warning. According to the invention, the method and the system provide rapid evaluation and identification to rapidly-charging circuit, equalizer circuit and management system of the battery and provide basis for cascade utilization and service life extreme alternation of the battery.
Description
technical field [0001] The invention relates to a lithium battery degradation identification method and a degradation alarm system, belonging to the field of computer control systems. Background technique [0002] The continuous development of the economy is accompanied by the deterioration of the environment and the occurrence of energy shortages. Environmental protection and energy crises are increasingly restricting economic development. Countries all over the world are seeking to export clean energy. Lithium batteries, as a clean energy source, are increasingly used in people's production and life. Safe, stable and efficient operation is the principle of lithium battery management. In the battery management system (BMS), the detection of battery degradation, that is, the identification of battery damage and aging, is the bottleneck of battery management technology. Keep abreast of and grasp the degree of degradation and aging of the battery pack, and replace the batter...
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IPC IPC(8): G01R31/36
CPCG01R31/367G01R31/392
Inventor 李蓓陈伦琼史建平吴志祥蔡纪鹤李孝鹏
Owner 杭州巴特瑞新能源科技有限公司