A balancing algorithm for battery modules or systems
A battery module and equalization technology, applied in special data processing applications, design optimization/simulation, etc., can solve problems that cannot directly reflect the purpose of equalization, to ensure maximum utilization, reduce data storage and calculation, and improve balance efficiency effect
Active Publication Date: 2021-10-12
智锂物联(杭州)科技有限公司
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Problems solved by technology
The ultimate goal of battery balancing is to ensure the maximum utilization of battery capacity, and neither the voltage-based balancing method nor the SOC-based balancing method can directly reflect the balancing purpose.
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[0019] The present invention proposes an equalization algorithm for a battery module or system, which will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0020] The present invention proposes an equalization algorithm for a battery module or system. The battery module is composed of single cells connected in series and parallel. The battery system can be composed of battery modules or directly composed of single cells. The algorithm of the present invention can only identify the power difference between the single batteries in the battery module or the system that needs to be balanced in the charging mode. This method is based on the principle of battery charging curve consistency, that is, for batteries of the same type and batch, when their internal resistance, initial remaining power and capacity are the same, their charging voltage-charging ampere-hour curves are coincident. For single batteries of the same ba...
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The invention proposes an equalization algorithm for a battery module or system, which belongs to the technical field of battery management. When the battery module or system starts to charge, collect the current voltage and current of each single battery, and integrate the current in ampere-hours to calculate the sum of the accumulated charging power of each single battery; when the voltage value of any single battery reaches At the start point of the sampling record, the sum of the accumulated charging power at the same time is greater than or equal to the power threshold, and the voltage and power of the single battery are recorded to obtain the corresponding voltage-power relationship; The voltage of each single battery can be obtained to obtain the power corresponding to each single battery; select the single battery with the smallest power value at the end of sampling, and calculate the difference between the power of other single batteries and the minimum power, which is the balance value of each single battery. electricity. The invention can realize the maximum utilization of the capacity of the battery module or the system, and does not produce the problem of over-balancing, and has low cost and high efficiency.
Description
technical field [0001] The invention belongs to the technical field of battery management, and in particular relates to an equalization algorithm for a battery module or system. Background technique [0002] A battery module or system is usually composed of dozens or even hundreds of single cells connected in series and parallel. Due to the inconsistency between the single cells, the charging capacity and discharge efficiency of the battery module or system are affected. The inconsistency of battery modules or systems refers to the differences in voltage, internal resistance, capacitance, self-discharge rate, etc. of batteries of the same specification and type. Although theoretically speaking, the operating voltage, The actual capacity and internal resistance should be consistent, but during the manufacturing process of the battery, due to process problems and uneven materials, there are slight differences inside the battery, resulting in that the battery capacity and inter...
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IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 卢兰光冯莉原周雪亮韩雪冰冯旭宁李建秋欧阳明高
Owner 智锂物联(杭州)科技有限公司