Apparatus and method for controlling the temperature of a battery in a hybrid electric vehicle
A method is provided for controlling the temperature of a traction battery in a hybrid vehicle, where the hybrid vehicle includes an internal combustion engine and an electric motor for traction power. The method includes providing a first temperature regulating circuit for the internal combustion engine, providing a second temperature regulating circuit for the traction battery, heating the traction battery by an electrical heater provided in the second temperature regulating circuit in series with a pump, a radiator and the traction battery, transferring power to the electrical heater via a DC/DC converter from the electrical motor, which electrical motor is driven by the internal combustion engine, while the battery is below a predetermined temperature interval.
1. A method for controlling the temperature of a traction battery in a hybrid vehicle, where the hybrid vehicle comprises an internal combustion engine and an electric motor for traction power, comprising:
providing a first temperature regulating circuit for the internal combustion engine,
providing a second temperature regulating circuit for the traction battery,
heating the traction battery by an electrical heater provided in the second temperature regulating circuit in series with a pump, a radiator and the traction battery, and
transferring power to the electrical heater via a DC/DC converter from the electrical motor, which electrical motor is driven by the internal combustion engine, while the battery is below a predetermined temperature interval.
2. The method according to claim 1 , further using the battery for traction power only when the battery has a temperature within the predetermined temperature interval.
3. The method according to claim 1 , further comprising providing a bypass circuit for the radiator in the second temperature regulating circuit, and regulating a flow of liquid coolant into the radiator or into the bypass circuit by a valve.
4. The method according, to claim 1 , further comprising controlling the electric motor by a voltage target value for feeding power to the electrical heater when the batter is below the predetermined temperature interval.
5. The method according to claim 1 , further comprising isolating the second temperature regulating circuit from the first temperature regulating circuit.
6. A system for controlling the temperature of a traction battery in a hybrid vehicle, where the hybrid vehicle comprises an internal combustion engine and an electric motor for traction power, the system comprising:
a first temperature regulating circuit for the internal combustion engine, a second temperature regulating circuit for the traction battery,
a heater, a pump and a radiator provided in the second temperature regulating circuit, wherein the heater is provided with power via a DC/DC converter from the electric motor, which electric motor is driven by the internal combustion engine.
7. The system according to claim 6 , further comprising a bypass circuit for the radiator in the second temperature regulating, circuit, and a valve for regulating a flow of liquid coolant into the radiator or into the bypass circuit.
8. The system according, to claim 6 , further comprising a controller for controlling the electric motor by a voltage target value for feeding power to the heater when the battery is below the predetermined temperature interval.
9. The system according to claim 6 , wherein the first and second temperature regulating circuits are isolated from each other.