Vehicle and control method thereof

A method comprising:

• controlling, by a controller, a low-voltage output unit to supply a sine wave current, of a predetermined frequency, to an auxiliary battery of a vehicle;
• measuring, using a battery sensor, a change in a current amount of the auxiliary battery generated by the sine wave current supplied to the auxiliary battery;
• based on the change in the current amount measured by the battery sensor, calculating, by the controller, a characteristic of an internal resistance, of the auxiliary battery, corresponding to the predetermined frequency;
• and
• controlling, by the controller and based on the characteristic of the internal resistance of the auxiliary battery, the low-voltage output unit to adjust a charging voltage being supplied to the auxiliary battery.

A vehicle comprising:

• a battery configured to supply power to the vehicle;
• a charging node configured to charge the battery;
• a battery sensor configured to sense at least one battery parameter of the battery;
• and
• a control circuit configured to:
• determine, based on the at least one battery parameter, a characteristic of an internal resistance of the battery, wherein the characteristic of the internal resistance is associated with a characteristic of an alternating current supplied to the battery;
• and
• generate, based on the characteristic of the internal resistance, a signal indicating a state of health of the battery,
• wherein the control circuit is configured to decrease or increase, based on the signal indicating the state of health of the battery, an input voltage applied to the battery, and wherein the state of health indicates a durability of the battery.