Battery system

A battery system includes a first battery, a second battery, and a battery manager. The first battery is electrically connected between a first node and a second node via a first module switch in a short circuit state. The second battery is electrically insulated from the first battery by a second module switch in an open circuit state. The battery manager detects a first battery voltage of the first battery, a second battery voltage of the second battery, and a system current flowing between the first and second nodes, determines an open circuit voltage of the first battery based on the first battery voltage and the system current, and short-circuits the second module switch when the open circuit voltage is substantially equal to the second battery voltage so that the at least one second battery is connected to the at least one first battery in parallel. 种电池系统包括第电池、第二电池和电池管理器。第电池经由处于短路状态中的第模块开关电连接在第节点和第二节点之间。第二电池被处于开路状态中的第二模块开关与第电池电隔离。电池管理器检测第电池的第电池电压、第二电池的第二电池电压以及在第节点和第二节点之间流动的系统电流，基于第电池电压和系统电流确定第电池的开路电压，并且