The invention provides a battery charging and discharging circuit, a battery charging and discharging system and an electric automobile, after a control unit determines that each battery cell is normal, if a charging instruction is received and each parallel relay is judged to be non-adhesion, a first instruction is output; the series-parallel switching unit receives the first instruction and outputs a series signal to control each series relay to be closed and each parallel relay to be disconnected so as to charge each battery module in series; if the control unit receives the discharge instruction and judges that each series relay is not adhered, a second instruction is output; and the series-parallel switching unit receives the second instruction and outputs a parallel signal to control each parallel relay to be closed and each series relay to be disconnected so as to discharge each battery module in parallel. When the circuit is used for charging, a plurality of battery modules can be connected in series, the charging voltage is increased, the charging current is reduced, and the charging speed is improved; and during discharging, a plurality of battery modules can be connected in parallel, and the system voltage is reduced, so that the requirement on the voltage resistance of the whole vehicle can be reduced.
本发明提供了一种电池充放电电路、系统及电动汽车,控制单元在确定每个电芯正常后,若接收到充电指令,且判断每个并联继电器无粘连,输出第一指令;串并联切换单元接收第一指令,输出串联信号,以控制每个串联继电器闭合,每个并联继电器断开,对每个电池模组串联充电;控制单元若接收到放电指令,且判断每个串联继电器无粘连,输出第二指令;串并联切换单元接收第二指令,输出并联信号,以控制每个并联继电器闭合,每个串联继电器断开,以对每个电池模组并联放电。该电路在充电时,可以使多个电池模组串联,增大充电电压,降低充电电流,提高充电速度;在放电时,可以使多个电池模组并联,降低系统电压,从而可以降低对整车的耐压性能要求。
Battery charging and discharging circuit, battery charging and discharging system and electric vehicle
电池充放电电路、系统及电动汽车
14.02.2025
Patent
Elektronische Ressource
Chinesisch
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