Toyota Hybrid System High-Voltage Battery

TOYOTA Hybrid System – Course 071. 3-1. The sealed nickel-metal hydride (Ni-MH ) battery technology developed for the hybrid system provides both high …

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Toyota Hybrid System High-Voltage Battery
The sealed nickel-metal hydride (Ni-MH) battery technology developed for the hybrid system provides both high power density and excellent longevity. The hybrid system controls charge and discharge rates to keep the HV battery at a constant State of Charge (SOC).
HV Battery Layout
The HV Battery, Battery ECU and SMR (System Main Relay) are enclosed in a single case located in the luggage compartment behind the rear seat.
Power Cable The power cable is a high-voltage, high-amperage cable that connects
the HV battery with the inverter and the inverter with MG1 and MG2. In the \’04 & later Prius, the power cable also connects the inverter with the A/C compressor. The power cable is routed under the rear seat, through the floor panel, along the under-the-floor reinforcement, and connects to the inverter in the engine compartment. The 12V DC wiring harness follows a similar route from the auxiliary battery to the front of the vehicle The power cable is shielded to reduce electromagnetic interference. For identification purposes, the high-voltage wiring harness and connectors are color-coded orange to distinguish them from ordinary low-voltage wiring.
High-Voltage Battery
HV – Nickel-Metal The HV battery pack contains six nickel-metal hydride 1.2V cells that Hydride Battery are connected in series to form one module.
In the \’01-03 Prius, 38 modules are divided into two holders and connected in series. Thus, the HV battery contains a total of 228 cells and has a rated voltage of 273.6V. In the \’04 and later Prius, 28 modules are connected for a rated voltage of 201.6V. The cells are connected in two places to reduce the internal resistance of the battery. The electrode plates in the HV battery are made of porous nickel and metal hydride alloy.

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