Method for equalizing voltage of single batteries of battery pack system
A technology for battery cells and battery packs, which is applied to charge balancing circuits, battery circuit devices, and arrangement of multiple synchronous batteries, etc., can solve the problems of small balancing current and cannot be supplemented with low-capacity cells, and achieve simple control. , good real-time performance, and the effect of improving the capacity of the whole group
Active Publication Date: 2018-08-24
JIANGSU ROTHWELL ELECTRIC
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Problems solved by technology
[0003] Passive equalization is to connect a switchable discharge resistor in parallel with each string of batteries. BMS controls the discharge resistor to discharge the cells with higher voltage, and the electric energy is dissipated in the form of heat. This method can only discharge cells with high voltage. , it is not possible to supplement the low-capacity monomers, and the balance current is generally small due to the power limit of the discharge resistor.
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[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0018] Such as figure 1 As shown, a battery pack system includes 6 battery cells B1 to B6, and each battery cell Bx (x is a number from 1 to 6) is provided with an insurance FUx and a controllable MOS switch one by one. The tube Sx and a balancing capacitor Cx, all the balancing capacitors Cx are capacitors of the same specification, are connected in series in the circuit to form a voltage d...
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The invention relates to a method for equalizing voltage of single batteries of a battery pack system. The method comprises the following steps of (1) pre-judging; (2) pre-charging; (3) equalizing; and (4) ending, wherein the step 1) is judging whether the voltage of the single batteries of the battery pack system needs to be equalized or not through a BMS, equalization is started when default setting is starting up, or equalization is started when deltau is greater than or equal to a set threshold; and deltau represents a difference between the maximum value and the minimum value in voltage values of the single batteries. According to the method for equalizing the voltage of the single batteries of the battery pack system provided by the invention, equalization is kept in a dynamic process by adopting inherent characteristics of a circuit, only a few of silicon-controlled switches need to be fixedly conducted in the beginning stage in the whole process, the CPU resource is saved, themethod is good in instantaneity, simple in control, safe, reliable and good in stability, all single batteries can be stabilized close to an ideal value U / 6 at the same time, the capacity of the wholepack is farthest improved and the requirements of practical application can be well met.
Description
technical field [0001] The invention belongs to the technical field of battery pack system management, and in particular relates to a method for balancing the voltage of battery cells in a battery pack system. Background technique [0002] In a battery pack system connected in series, it is necessary to ensure that each battery cell in the battery pack has a certain service life, which requires the voltage of any single cell to be within a reasonable range. This actually reflects the capacity of the battery cell to a certain extent. When a battery cell with a small capacity is fully charged or discharged, its voltage will rise or fall sharply, exceeding the specified voltage range. BMS ( That is, the BATTERY MANAGEMENT SYSTEM, the battery management system) needs to cut off the high voltage and prohibit the charging and discharging of the system to ensure that the monomer will not be damaged. reduction in capacity. Therefore, the capacity of the entire battery pack system ...
Claims
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IPC IPC(8): H01M10/42H01M10/46H02J7/00
CPCH01M10/4207H01M10/4264H01M10/46H02J7/0019H01M2010/4271Y02E60/10
Inventor 周祥东黄雁王秋生
Owner JIANGSU ROTHWELL ELECTRIC