A system and method for charging a vehicle having a first battery, such as a high-voltage traction battery, and a second battery, such as a low-voltage battery, include controlling a DC converter or relay to effectively decouple the second battery from the converter when the vehicle is connected to an external power source to reduce or prevent damage to the second battery from extended or prolonged charging. The second battery may be effectively decoupled from the converter by controlling the relay or converter voltage based on state of charge of the second battery so that substantially zero current flows to and from the second battery relative to the converter and any vehicle low voltage consumers/accessories.
Electric charging method for a vehicle and electric vehicle charging device
2017-08-29
Patent
Elektronische Ressource
Englisch
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