Battery electric vehicle energy storage system and method
AssigneeGM Global Technology Operations LLC
InventorsFang Dai, Shifang Li, Jinming Liu, Yue Fan, Mei Cai
Life of this patent
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Abstract
A battery electric vehicle includes a high voltage rechargeable energy storage system (RESS). The RESS includes several battery modules reconfigurable among parallel and series arrangements. During reconfiguration transitions, a low voltage battery services low voltage loads of the battery electric vehicle. The low voltage battery is preconditioned in advance of reconfigurations.
Claims19
A method for reconfiguring a high voltage (HV) rechargeable energy storage system (RESS) having a plurality of HV DC battery modules, a HV bus and an auxiliary power module (APM) selectively couplable between HV DC battery modules and a low voltage (LV) DC auxiliary battery of a LV RESS, comprising:
- prior to a reconfiguration of the HV RESS, preconditioning the LV DC auxiliary battery to a predetermined state of discharge readiness sufficient to solely service LV electrical loads on a LV bus, comprising establishing at least one predetermined battery parameter to a respective target;
- isolating with the APM the LV RESS and the LV bus from the HV RESS and the HV bus during a reconfiguration of the HV RESS;
- and
- electrically servicing the LV electrical loads on the LV bus with the LV DC auxiliary battery during the reconfiguration of the HV RESS.
A method for operating an energy storage system having a plurality of high voltage (HV) DC battery modules and an auxiliary power module (APM) selectively couplable between HV DC battery modules and a low voltage (LV) DC auxiliary battery, comprising:
- executing a direct current recharge routine for a rechargeable battery energy storage system, the recharge routine comprising selectively reconfiguring the rechargeable battery energy storage system from among a plurality of configurations during the recharge routine;
- in advance of an incipient reconfiguration of the rechargeable battery energy storage system, flowing current through the LV DC auxiliary battery to establish a predetermined state of discharge readiness of the LV DC auxiliary battery;
- and
- during any reconfiguration of the rechargeable battery energy storage system, isolating with the APM the LV DC auxiliary battery from all HV DC battery modules and electrically servicing a predetermined electrical load with the LV DC auxiliary battery.
A battery electric vehicle, comprising:
- a controller;
- an energy storage system having a plurality of high voltage (HV) DC battery modules and an auxiliary power module (APM) selectively couplable between HV DC battery modules and a low voltage (LV) DC auxiliary battery;
- the controller configured to:
- execute a direct current recharge routine for a rechargeable battery energy storage system, the recharge routine comprising selectively reconfiguring the rechargeable battery energy storage system from among a plurality of configurations during the recharge routine;
- in advance of an incipient reconfiguration of the rechargeable battery energy storage system, flow current through the LV DC auxiliary battery to establish a predetermined state of discharge readiness of the LV DC auxiliary battery;
- and
- during any reconfiguration of the rechargeable battery energy storage system, isolate with the APM the LV DC auxiliary battery from all HV DC battery modules and electrically service a predetermined electrical load with the LV DC auxiliary battery.
Dependencies are inferred from the claim text.