Equalization algorithm used for battery module group or system
A battery module and equalization technology, applied in computing, electrical digital data processing, special data processing applications, etc., can solve problems that cannot directly reflect the purpose of equalization, to ensure maximum utilization, improve equalization efficiency, and reduce data storage and the computational effect
Active Publication Date: 2018-08-24
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 provides an equalization algorithm used for a battery module group or system, and belongs to the field of battery management technology. When charging of the battery module group or system is started, a current voltage and current of each single-body battery are collected, and ampere-hour integration is carried out on the current to calculate the sum of an accumulated charging poweramount of each single-body battery; when a voltage value of any single-body battery reaches a sampling record starting point and the sum of an accumulated charging power amount is greater than or equal to a power amount threshold value at the same time, recording of voltages and power amounts of the single-body battery is started to obtain a corresponding voltage-power amount relationship; when the sampling record ending point is reached, current voltages of all the single-body batteries are recorded to obtain a power amount corresponding to each single-body battery; and the single-body battery with a minimum power amount value at a sampling ending moment is selected, and values of differences between power amounts of the other single-body batteries and a minimum power amount, namely poweramounts needed for equalization of all the single-body batteries, are calculated. According to the algorithm, maximum utilization of capacity of the battery module group or system can be realized, the over-equalization problem is not generated, costs are low, and efficiency is high.
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): G06F17/50
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