Vehicle battery charging device and method

A method for charging a vehicle battery, the method comprising:

• performing a plurality of charging condition determining steps of determining charging conditions of a battery, based on battery state information;
• a continuous charging starting step of continuously charging the battery at a constant voltage when any one of the charging conditions of the plurality of charging condition determining steps satisfies a continuous charging condition;
• and
• a pulse charging starting step of performing a pulse-charging that alternately provides a charging voltage and a discharge voltage to the battery when all of the charging conditions of the plurality of charging condition determining steps satisfy a pulse charging condition.

The method of claim ii, wherein the plurality of charging condition determining steps includes:

• a first charging condition determining step of determining whether a neglect period of the battery exceeds a preset period, based on the battery state information;
• a second charging condition determining step of comparing a charging amount of the battery with a preset charging amount, based on the battery state information;
• a third charging condition determining step of comparing a temperature of an electrolyte solution of the battery with a preset temperature, based on the battery state information;
• and
• a fourth charging condition determining step of comparing an internal resistance of the battery with a preset resistance, based on the battery state information.

A method for charging a vehicle battery, the method comprising:

• determining whether a neglect period of the battery exceeds a preset period;
• comparing a charging amount of the battery with a preset charging amount;
• comparing a temperature of an electrolyte solution of the battery with a preset temperature;
• comparing an internal resistance of the battery with a preset resistance;
• continuously charging the battery at a constant voltage when the neglect period of the battery does not exceed the preset period, when the charging amount of the battery is greater than the preset charging amount, when the temperature of the electrolyte solution of the battery is less than the preset temperature, or when the internal resistance of the battery is greater than the preset resistance;
• and
• performing a pulse-charging that alternately provides a charging voltage and a discharge voltage to the battery when the neglect period of the battery exceeds the preset period, when the charging amount of the battery is less than the preset charging amount, when the temperature of the electrolyte solution of the battery is greater than the preset temperature, and when the internal resistance of the battery is less than the preset resistance.