On-line Estimation Method of State of Charge of Battery Cluster
A state-of-charge, battery cluster technology, applied in the measurement of electricity, measurement of electrical variables, instruments, etc., can solve the problem of low calculation accuracy, battery stack or battery cluster can not reach full or empty, affecting the performance of energy storage power station, etc. problem, to achieve the effect of improving the calculation accuracy and smoothing the state of charge curve
Active Publication Date: 2022-02-08
杭州科工电子科技股份有限公司
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Both of these calculation schemes have the problem that the state of charge of the battery stack and the state of charge of the battery cluster have a step, and when the single battery is fully charged or discharged, the battery stack or battery cluster cannot be fully charged or discharged. For the battery The calculation accuracy of the state of charge of the stack or battery cluster is not high, which affects the performance of the energy storage power station
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[0062] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation methods.
[0063] Wherein, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical drawings, and should not be construed as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings will be omitted, Enlargement or reduction does not represent the size of the actual product; for those skilled in the art, it is understandable that certain known structures and their descriptions in the drawings may be omitted.
[0064] In the drawings of the embodiments of the present invention, the same or similar symbols correspond to the same or similar components; , "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional ...
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The invention discloses an online estimation method for the state of charge of a battery cluster, which includes: step S1, using the state of charge of the single battery calculated in real time, to calculate the state of charge of the battery stack to which each single battery belongs; step S2, using the real-time Calculate the state of charge of the battery stack and the state of charge of each single battery, and calculate the state of charge of each battery cluster in the battery stack. The invention uses the battery voltage and current data acquired in real time to first calculate the state of charge of the single battery, then calculate the state of charge of the battery stack, and finally calculate the battery cluster in the battery stack by combining the state of charge of the single battery and the state of charge of the battery stack The state of charge of the battery pack realizes the real-time hierarchical calculation of the state of charge of the battery stack, the state of charge of the battery cluster and the state of charge of the single battery, improves the calculation accuracy of the state of charge of the battery cluster, and obtains a smooth state of charge curve , and at the same time make the operating state of the battery stack and battery cluster follow the full state or empty state of the single battery to achieve full or empty.
Description
technical field [0001] The invention relates to the technical field of battery management, in particular to an online estimation method for the state of charge of a battery cluster. Background technique [0002] In recent years, the application scale of lithium-ion batteries in energy storage power stations has grown explosively, and the battery management system (Battery management system, BMS) that works with lithium-ion batteries is responsible for managing the charging and discharging status of batteries and using them safely. Battery state of charge (State of charge, SOC) is a physical quantity that directly reflects the energy state of the battery, and is an important parameter for battery charge and discharge management and safety control. [0003] The battery system of an energy storage power station generally consists of multiple single cells connected in series and parallel to form a battery cluster, and multiple battery clusters are then connected in parallel to f...
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IPC IPC(8): G01R31/3842G01R31/388
CPCG01R31/3842G01R31/388
Inventor 宋欣民陈刚良周建军王荣强
Owner 杭州科工电子科技股份有限公司