A method for measuring the dynamic external characteristics of a power battery
A technology for power battery and external characteristics, which is applied in the direction of measuring electricity, measuring electric variables, measuring devices, etc., can solve the problem of poor repeatability of power battery external characteristic measurement work, affect the measurement accuracy of power battery external characteristics, and cannot objectively reflect power battery Characteristics and other issues, to achieve the effect of facilitating project implementation, improving operating efficiency, and improving measurement accuracy
Active Publication Date: 2017-07-18
TSINGHUA UNIV
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However, the existing power battery modeling work does not systematically study the different dynamic processes of the power battery, which leads to unclear understanding of the dynamic characteristics of the power battery, the lack of mechanism explanation of the established model, and ultimately affects the external characteristics of the power battery Measurement accuracy
In order to solve this problem, some studies have introduced a large number of empirical parameters to assist the determination of the external characteristics of the power battery. The selection of these empirical parameters often includes the subjective factors of the researcher and the accidental factors in the test conditions of the power battery, and cannot be objectively determined. Reflect the characteristics of the power battery, which ultimately leads to poor repeatability of the determination of the external characteristics of these power batteries
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[0043] The method for measuring the dynamic external characteristics of the power battery proposed by the present invention, its flow chart is as follows figure 1 shown, including the following steps:
[0044] (1) According to the standard discharge current of the power battery, the cut-off voltage corresponding to the standard discharge current, the standard charging current, the standard charging voltage and the cut-off current corresponding to the standard charging voltage specified in the power battery product manual, the power battery is tested several times. Standard charge and discharge cycle operation, and finally carry out standard charge to fully charge or fully discharge the power battery;
[0045] (2) Obtain N operating currents of the power battery from the safe working range of the power battery specified in the power battery product manual, denoted as i 1 ,i 2 ,..., i N , and get the cut-off voltage corresponding to each working current according to the power...
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The invention relates to a method for measuring dynamic external characteristics of a power battery, and belongs to the technical field of a battery. The method is characterized in that the dynamic external characteristics of the power battery near different working currents can be obtained through a method of stacking dynamic excitation on the different working currents, time-varying characteristics which are mixedly stacked in the dynamic external characteristics of the power battery can be approximately removed based on a constant-current characteristic curve of the power battery and a curve differencing method, and the accurate measuring on the dynamic external characteristics of the power battery can be finally realized. According to the method disclosed by the invention, different dynamic characteristic information in the power battery under different working current conditions can be more fully revealed, and thus high modeling accuracy can be obtained; the method not only can be offline used by a power battery manufacturer to test basic parameters of the power battery, but also can be used for online testing the power battery.
Description
technical field [0001] The invention relates to a method for measuring dynamic external characteristics of a power battery, in particular to a test method of a power battery and a related data processing method, belonging to the technical field of batteries. Background technique [0002] With the advancement of new renewable energy technology, micro-grid technology and electric vehicle technology, battery energy storage systems are being increasingly widely used in industrial production and daily life. In order to ensure the safe and efficient operation of the battery energy storage system, the system is equipped with a battery management system to monitor the state of the power battery in the battery energy storage system and predict the external characteristics of the power battery. Among them, accurate measurement of the external characteristics of the power battery is the key to the effective management of the battery by the battery management system. This work determine...
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IPC IPC(8): G01R31/36
Inventor 何志超杨耕耿华
Owner TSINGHUA UNIV
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