Abstract: A method and a device for balancing a battery state are provided, in which the method includes executing a battery capacity balancing of a plurality of battery packs when voltage information of the plurality of battery packs is open circuit voltages or when balanced voltages of the plurality of battery packs are on the same curve fragment, such that balanced capacities of the plurality of battery packs can be calculated via aging voltage compensation parameters and/or aging capacity compensation parameters of the plurality of battery packs, and a capacity adjustment can be performed according to the balanced capacities. Therefore, the battery capacity balancing can be performed by obtaining voltages in different states, and the battery capacity of each battery pack can be accurately adjusted to achieve balance among the battery packs by taking the aging parameters of the battery packs into consideration.

Abstract: A battery estimation method is provided. The method includes obtaining a potential difference parameter term associated with an estimated absolute state-of-charge for determining a maximum load capable of continuous drawing for a duration of the battery. The potential difference parameter term includes a potential difference characteristic parameter, or the potential difference parameter term includes the potential difference characteristic parameter and a potential difference compensation parameter.

Abstract: A battery estimation method is provided. The method includes obtaining a potential difference parameter term associated with an estimated absolute state-of-charge for determining a maximum load capable of continuous drawing for a duration of the battery. The potential difference parameter term includes a potential difference characteristic parameter, or the potential difference parameter term includes the potential difference characteristic parameter and a potential difference compensation parameter.

Abstract: A method includes recording a branch current and a terminal voltage of each of two parallel connected cells of a battery pack during the battery pack being switched from a charging or discharging state through a rest state to a balance state, to obtain an internal resistance of each cell, and an open-circuit voltage (OCV) and a state of charge (SOC) of the battery pack in the balance state, to obtain an OCV and a SOC of each cell just before the battery pack is switched to the rest state; and obtaining an aging differential index according to the SOC of each cell just before the battery pack is switched to the rest state, the branch current of each cell just after the battery pack is switched to the rest state, and a rated capacity of the battery pack, to determine a relative aging level of the two cells.

Abstract: A method of determining an aging level of a battery includes utilizing a first charging device to charge a first battery; utilizing a second obtaining device to obtain a plurality of first steady open-circuit voltages (OCVs) of the first battery when a charging state of the first battery respectively reaches a plurality of first stop-charge conditions; utilizing a second charging device to charge a second battery; utilizing a third obtaining device to obtain a stop-charge parameter of the second battery and a second steady OCV of the second battery corresponding to the stop-charge parameter of the second battery; and utilizing an aging level determining device to determine an aging level of the second battery relative to the first battery according to the second steady OCV of the second battery and one of the first steady OCVs of the first battery corresponding to the stop-charge parameter of the second battery.

Abstract: A method of determining an aging level of a battery includes utilizing a first charging device to charge a first battery; utilizing a second obtaining device to obtain a plurality of first steady open-circuit voltages (OCVs) of the first battery when a charging state of the first battery respectively reaches a plurality of first stop-charge conditions; utilizing a second charging device to charge a second battery; utilizing a third obtaining device to obtain a stop-charge parameter of the second battery and a second steady OCV of the second battery corresponding to the stop-charge parameter of the second battery; and utilizing an aging level determining device to determine an aging level of the second battery relative to the first battery according to the second steady OCV of the second battery and one of the first steady OCVs of the first battery corresponding to the stop-charge parameter of the second battery.

Abstract: A method includes recording a branch current and a terminal voltage of each of two parallel connected cells of a battery pack during the battery pack being switched from a charging or discharging state through a rest state to a balance state, to obtain an internal resistance of each cell, and an open-circuit voltage (OCV) and a state of charge (SOC) of the battery pack in the balance state, to obtain an OCV and a SOC of each cell just before the battery pack is switched to the rest state; and obtaining an aging differential index according to the SOC of each cell just before the battery pack is switched to the rest state, the branch current of each cell just after the battery pack is switched to the rest state, and a rated capacity of the battery pack, to determine a relative aging level of the two cells.