Apparatus, system and method for a self-heating battery circuit
View Patent ↗The disclosed exemplary apparatuses, systems and methods may provide a self-heating battery circuit, that comprises: a high voltage battery having terminals, and a parasitic internal resistance (R 1 ) and a parasitic terminal inductance (L 1 ); a resonant circuit connected across the battery terminals suitable to generate high alternating currents about its resonant frequency, fr; an energy superposition unit connected across a capacitance of the resonant circuit, and including a switch (K 1 ), wherein K 1 is switched on and off at the resonant frequency, fr, and at a first duty cycle pursuant to a switch control signal, thereby generating a high alternating current through the high voltage battery.
1. A self-heating battery circuit, comprising:
a high voltage battery having terminals, and a parasitic internal resistance (R 1 ) and a parasitic terminal inductance (L 1 );
a resonant circuit connected across the battery terminals suitable to generate high alternating currents about its resonant frequency (fr);
an energy superposition unit connected across a capacitance of the resonant circuit, and including a switch (K 1 ), wherein K 1 is switched on and off at the resonant frequency, fr, and at a first duty cycle pursuant to a switch control signal, thereby generating a high alternating current through the high voltage battery.
2. The self-heating battery circuit of claim 1 , further comprising a freewheeling circuit including at least a dampening device (R 2 ) and a switch (K 2 ), and which is capable of recirculating residual current when K 1 turns off.
3. The self-heating battery circuit of claim 1 , wherein fr is determined by 1/(2π*sqrt((L 1 +L 2 )*C 1 )), where L 2 and C 1 are an added inductance of the resonant circuit, and C 1 is the capacitance of the resonant circuit, respectively.
4. The self-heating battery circuit of claim 3 , wherein L 2 is zero if L 1 exceeds a predetermined threshold.
5. The self-heating battery circuit of claim 1 , wherein the energy superposition unit further comprises an induction (L 3 ).
6. The self-heating battery circuit of claim 1 , wherein the high alternating current is additionally generated through the resonant circuit.
7. The self-heating battery circuit of claim 2 , wherein the freewheeling circuit enables a soft start up of the energy superposition unit.
8. The self-heating battery circuit of claim 7 , wherein the freewheeling circuit is off during steady state operation of the energy superposition unit.
9. The self-heating battery circuit of claim 2 , wherein the freewheeling circuit is remedial to a premature deactivation of K 1 .
10. The self-heating battery circuit of claim 1 , wherein the high alternating current is substantially independent of R 1 .
11. The self-heating battery circuit of claim 1 , wherein a magnitude of the high alternating current may be increased increasing a frequency of the switch control signal.