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US 12,391,148 B2Granted
Battery heating system
AssigneeGM Global Technology Operations LLC
InventorsChandra S. Namuduri, Neeraj S. Shidore
Life of this patent
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Abstract
AC current heating of a battery is performed using a half-bridge based quasi-resonant circuit.
Claims20
A heating apparatus for a battery, comprising:
- a first solid state switch having respective first and second terminals and a second solid state switch having respective first and second terminals, wherein the first solid state switch and the second solid state switch comprise one leg of an inverter coupled between a positive DC rail and a negative DC rail;
- the second terminal of the first solid state switch coupled to the first terminal of the second solid state switch at a first node;
- a coupling between a positive terminal of the battery and the first node with an inductance between the first node and the battery, wherein the inductance is switchably connected to the positive terminal of the battery by a third switch;
- a negative terminal of the battery coupled to the second terminal of the second solid state switch at a second node;
- a capacitance between the second node and the first terminal of the first solid state switch at a third node;
- and
- a controller repeatedly closing the second switch and opening the first switch for a first duration followed by opening the second switch and closing the first switch for a second duration.
4 more elements
A heating apparatus for a battery, comprising:
- a quasi-resonant circuit comprising an inductance, a capacitance, and a solid state half-bridge;
- and
- a controller alternating the circuit between a first configuration wherein the inductance is coupled directly across the battery and a second configuration wherein the inductance and the capacitance are in series coupled across the battery.
A heating apparatus for a battery, comprising:
- a battery having a positive terminal and a negative terminal;
- an electric propulsion system comprising a polyphase electric machine and a polyphase power inverter, the inverter comprising a plurality of phase legs coupled between a positive DC rail and a negative DC rail, each phase leg including respective upper and lower switches and a respective phase pole therebetween, wherein each phase pole is coupled to a respective phase winding of the polyphase electric machine;
- a capacitor coupled between the positive DC rail and the negative DC rail;
- a coupling between the positive terminal of the battery and a corresponding phase pole of one of the phase legs with an inductance between the corresponding phase pole and the battery;
- the negative terminal of the battery coupled to the negative DC rail and the positive terminal of the battery decoupled from the positive DC rail;
- and
- a controller operating the lower switch of the one of the phase legs complementary to the upper switch of the one of the phase legs, wherein the lower switch is in a closed state while the upper switch is in an open state for a first duration and the lower switch is in an open state while the upper switch is in a closed state for a second duration.
4 more elements
Dependencies are inferred from the claim text.