The invention discloses a lithium battery active equalization system and method. A plurality of batteries form a battery pack unit, a bidirectional DC/DC module is used for charging or discharging a single body with a large voltage difference, a working state of each DC/DC module is controllable, a circuit of the DC/DC module is independent, reliability is high, and complexity of the system is reduced; the DC/DC module is connected with a battery pack monomer through a switch array; only one monomer is equalized at the same moment, mutual influence between the circuits is avoided, a charging current is applied to the battery according to the voltage difference between the voltage value of the monomer of the battery and a set voltage, a maximum monomer charging current can reach 3-4A, an equalization speed is high, and the voltage of the monomer of the battery in each group unit is close to be consistent; and the charging and discharging current of the system is large, the voltage difference between the monomers is eliminated, equalization maintenance of the battery is completed, and the system and the method are widely applied to the fields of new energy automobile battery equalization system and second-hand battery equalization system transformation and power grid energy storage lithium battery application.
本发明公开了一种锂电池主动均衡系统及方法,将若干个电池组成一个电池组单元,由一个双向DC/DC模块对其中压差较大的单体进行充电或放电,每个DC/DC模块的工作状态可控,DC/DC模块电路独立,可靠性高,降低了系统的复杂度;DC/DC模块与电池组单体之间通过开关阵列进行连接,在同一时刻只对其中一个单体进行均衡,避免了电路之间的相互影响,根据电池的单体电压值与设定电压之间的压差,对电池施加充电电流,其中最大单体充电电流可达3~4A,均衡速度较快,使每个组单元内的电池单体电压接近一致;本系统的充放电电流较大,消除单体之间的压差,完成对电池的均衡维护,广泛应用于新能源汽车电池均衡系统及二手电池均衡系统改造和电网储能锂电池应用领域。
Lithium battery active equalization system and method
一种锂电池主动均衡系统及方法
2020-08-25
Patent
Elektronische Ressource
Chinesisch
IPC: | B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY |
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