Automatic equalization method and circuit for battery pack
An automatic balancing, battery pack technology, applied in battery circuit devices, electric vehicles, circuit devices, etc., can solve the problems of low system complexity, reliability impact, system complexity, etc., to achieve low failure rate, extended service life, cost low cost effect
Inactive Publication Date: 2011-08-10
HANGZHOU GOLD ELECTRONICS EQUIP CO LTD
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Problems solved by technology
This equalization method is time-consuming and expensive
[0004] To sum up, in the prior art, the system is relatively complex, the cost is high, and the reliability is also greatly affected. Therefore, the above-mentioned various equalization methods are difficult to apply to electric bicycles and other applications that require low cost and low system complexity. field
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[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples, but the protection scope of the present invention is not limited thereto.
[0022] refer to figure 1 , figure 2 , image 3 , the battery pack automatic balancing method and circuit of the present invention, the battery pack is composed of N battery cells, the battery cells are formed by one or more single cells connected in parallel or in series, and each battery cell has the same property; the battery The basic attributes include battery type, battery nominal capacity, and battery nominal voltage; the series-parallel structure of batteries includes the number of parallel-connected batteries and the number of series-connected batteries. In this embodiment, the battery pack is composed of 4 battery units, and the battery unit is a single cell. The present invention will be described in detail below with reference to a certain moment in the chargi...
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The invention relates to an automatic equalization method and circuit for a battery pack. The equalization method comprises the following steps of: comparing the voltage of each battery unit with the average voltage of the battery pack in the charging and discharging process of the battery pack, and equalizing the battery pack when the voltage of the battery unit is greater than the average voltage of the battery pack. The equalization circuit comprises a battery pack average voltage acquisition circuit, N battery unit discharging units and N actuator control circuits. The automatic equalization method and circuit for a battery pack, provided by the invention, can be applied to various battery packs such as lithium batteries and the like. The method and the circuit can be used for automatically equalizing battery units with low voltage, hardware is adopted to real-time control; the over-charge and over-discharge of battery units in the serial battery pack can be effectively inhibited, so that the conformity of the battery pack can be improved within shortest time, and the service life of the battery pack is prolonged; and the automatic equalization circuit has the characteristics of low fault rate, low cost, convenience for control and rapidness for response.
Description
technical field [0001] The invention relates to an automatic balancing method and circuit for a battery pack in series, in particular to a method and a circuit for automatically balancing each battery unit in the battery pack during charging and discharging. Background technique [0002] Due to the production process and other reasons of the single battery, the capacity and performance of each battery are different. In the process of charging and discharging the battery pack, this difference will inevitably be enlarged. When charging, the battery with small capacity and poor performance will be overcharged; When discharging, the battery with small capacity and poor performance will be over-discharged; the capacity utilization rate of the battery pack will be lower and lower. If things go on like this, this vicious cycle process will accelerate the damage of the battery. Therefore, it is the consensus of scholars and industries at home and abroad that the power battery pack n...
Claims
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Inventor 陈春飞郑益王浩
Owner HANGZHOU GOLD ELECTRONICS EQUIP CO LTD