Battery charging control method and system of mass fitting charging curve
A battery charging and charging curve technology, applied in secondary battery charging/discharging, battery circuit devices, secondary batteries, etc., can solve problems such as battery performance degradation, poor charging effect, battery electrolyte gas evolution reaction temperature, etc.
Active Publication Date: 2018-05-01
广州市君盘实业股份有限公司
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Problems solved by technology
If constant current charging is used for a long time, the charging current may exceed the acceptable current in the later stage of constant current charging, which will cause gassing reaction or temperature rise in the battery electrolyte, which will affect the battery life.
Therefore, the traditional battery charging method is likely to cause battery performance degradation and poor charging effect.
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[0031] According to Maas's law, during the constant current charging process of the battery, its capacity can only be charged to a certain value. The larger the constant current value, the lower the upper limit of the capacity that can be charged. During the process, the charging current should decrease exponentially, refer to figure 1 (a) is the Maas charge curve. The formula for Maas' Law is as follows:
[0032] I=I o exp(-at);
[0033] a=I o / C;
[0034] Among them, I t The charging current acceptable to the battery at any time, I o is the initial acceptable charging current, a is the decay rate constant or charge ratio constant, and C is the discharged capacity, that is, the required charging capacity.
[0035] Maas's three laws describe a:
[0036] (1) a is inversely proportional to the square root of the discharged capacity C:
[0037] (2) a and discharge current I d The logarithm of is proportional to:
[0038] (3) The acceptable charging current is the s...
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The invention relates to a battery charging control method and system of a mass fitting charging curve. The method comprises the steps of obtaining the battery type of a battery to be charged so as toquery the corresponding preset charging scheme, the initial charging current, the battery feature parameter, the maximum charging voltage, and a voltage-current relation function; obtaining the corresponding standard charging voltage as the adjusting reference voltage based on the initial charging current, the battery feature parameter, the maximum charging voltage, and the voltage-current relation function; charging the battery to be charged based on the preset charging scheme and obtaining the actual charging voltage of the current time, and determining whether the actual charging voltage is more than or equal to the adjusting reference voltage or not. If the actual charging voltage is more than or equal to the adjusting reference voltage, please return to the step of charging the battery to be charged based on the preset charging scheme. If the actual charging voltage is less than or not equal to the adjusting reference voltage, the preset selected voltage ratio can be obtained, and the target charging current can be obtained based on the selected voltage ratio, the battery feature parameter and the voltage-current relation function, and charging control via current can be conducted on the battery to be charged based on the target charging current. Accordingly, the performance of the battery to be charged can be improved.
Description
technical field [0001] The invention relates to the technical field of charging, in particular to a battery charging control method and system for Maas fitting charging curve. Background technique [0002] Charging is the only way to replenish energy for the battery. The quality of the charging method has an important impact on the performance of the battery. Improper charging methods can easily cause a significant drop in battery performance. Most battery charging methods are divided into three types: constant current charging, constant voltage charging or "constant current-constant voltage" combination charging. [0003] The traditional charging method usually includes a constant current charging process, and the charging current remains constant during the constant current charging process. According to Maas's law, the acceptable current of the battery decreases exponentially with the charging time during the charging process. If constant current charging is used for a ...
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IPC IPC(8): H02J7/00H01M10/44
CPCH01M10/44H01M10/446H02J7/0077Y02E60/10
Inventor 徐成宪
Owner 广州市君盘实业股份有限公司