HV Battery

* In the Prius, a sealed nickel hydride (Ni-MH) battery has been adopted. This HV battery has a high power density, is lightweight and long lifespan which match the characteristics of the TOYOTA hybrid system. Because the TOYOTA hybrid system controls the charge/discharge to maintain the SOC (State of charge) at a constant level while the vehicle is operating normally, it does not have to rely on external recharging.

* The HV battery, battery ECU, system main relay and cooling fan have been integrated into a single case which has been placed in the luggage compartment behind the rear seat to make more effective use of the vehicle space.

* A service plug that shuts off the circuit has been provided in the middle of the 28 modules (Rated battery capacity = 201.6V). Before servicing any portion of the high-voltage circuits, make sure to remove the service plug.

Please do not put the vehicle in the READY ON state when you have removed, or plan to remove, the service plug. There is a possibility that the battery ECU will be damaged.

* To ensure the HV battery's performance, the battery ECU controls the operation of the cooling fan to reduce the heat that is generated by the HV battery during charging and discharging.