A method for online estimation of power battery peak power
A peak power, power battery technology, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., to achieve the effect of simplifying peak power calculation, improving speed and accuracy
Active Publication Date: 2022-02-01
NANJING UNIV OF SCI & TECH
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[0004] The purpose of the present invention is to provide an online estimation method for the peak power of a power battery, which simplifies the peak power estimation calculation, calculates the interval where the restriction condition works in advance, calculates the peak current under the corresponding restriction condition according to the interval where the battery state is located, and solves the current problem. Estimation of the load bearing capacity of some single batteries
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[0113] Experimental background: In this example, the single battery model ISR18650-2.2Ah is used, the rated capacity is 2.2Ah, the voltage range is 2.75-4.2V, the SOC limit range is set at [5%, 95%], the maximum charging current is 1C, and the maximum Discharge current 5C.
[0114]Initial conditions: The battery is charged with CCCV, and it is left to stand at 25°C for 2 hours after it is fully charged. According to the settings in the experimental background, and step 2 in the above estimation method, it can be concluded that the SOC range under the three limiting conditions, in the case of charging: the range where the voltage limiting condition works is that the SOC is in [95.4%, 100% ]; the SOC limit condition works in the range of SOC in [94.4%, 95%]; the current limit in the range of SOC in [5%, 94.4%]. In the case of discharge: the range where the voltage limit condition works is SOC at [0, 4.4%]; the range where the SOC limit condition works is SOC is at [5%, 6.4%], a...
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The invention discloses an online estimation method for the peak power of a power battery. The method uses HPPC test experiments to obtain the first-order RC equivalent circuit model parameters of the battery as initial values; and calculates the current limit, voltage limit and SOC according to the obtained model parameters. Among the three constraints, the dividing point between any two constraints can be used to obtain the SOC interval in which each constraint works; use the DEKF algorithm to estimate the model parameters and SOC of the battery online, and according to the interval of the constraints in step 2, we can get The peak power is calculated with the limiting conditions in effect. The invention can simplify peak power calculation, update model state and parameters in real time, and improve peak power calculation speed and accuracy.
Description
technical field [0001] The invention relates to the technical field of battery management, in particular to an online estimation method for peak power of a power battery. Background technique [0002] Battery energy storage is widely used in energy storage systems, and it is extremely important for an energy storage system to determine how much load it can carry. [0003] The only things a battery can measure directly are voltage, current, and temperature. Therefore, in order to determine the carrying capacity of the battery, it is necessary to estimate the peak power of the battery in real time to ensure that the energy storage system can withstand the load and ensure the normal operation of the system. Existing peak power estimation methods directly calculate the minimum peak current under the joint constraints of voltage, current, and SOC, but in actual situations, these three constraints do not all work. Contents of the invention [0004] The purpose of the present i...
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IPC IPC(8): G01R31/367G01R31/3842
CPCG01R31/367G01R31/3842
Inventor 孙金磊唐传雨王天如李恒姜涛唐勇
Owner NANJING UNIV OF SCI & TECH