Battery balance charging controller for making one battery having lower voltage out of batteries connected in series to receive greater charging current and battery charging controlling apparatus using the same

A battery charging controlling apparatus, for charging a battery module comprising a plurality of battery units connected in series, wherein the battery charging controlling apparatus is coupled to a positive terminal and a negative terminal of each of the battery units, the battery charging controlling apparatus comprising:

• a battery charging controlling unit, for controlling magnitude of a charging current of the battery module according to a battery current detection signal and a battery voltage detection signal;
• and
• a battery balance charging controlling unit, coupled to the positive terminal and the negative terminal of each of the battery units, for determining a voltage difference between any two adjacent battery units of the battery module, and executing a balance charging control to adjust the magnitude of the charging currents of the two battery units when the voltage difference between any two adjacent battery units of the battery module is higher than a first preset value or lower than a second preset value, so as to make the charging current of one battery unit with a lowest voltage level out of the plurality of battery units greater than the charging current of one battery unit with a highest voltage level,
• wherein the battery balance charging controlling unit adjusts the magnitude of the charging current until a voltage difference between any two adjacent battery units of the battery module is lower than a third preset value, and the third preset value is less than the first preset value.

A battery balance charging controller, for balancing the charging of a first battery and a second battery, wherein a negative terminal of the first battery is connected with a positive terminal of the second battery to form a connection point, a positive terminal of the first battery forms a first terminal, a negative terminal of the second battery forms a second terminal, the battery balance charging controller comprising:

• a battery reference voltage generating unit, for providing a first set of battery balancing determination signals and a second set of battery balancing determination signals, wherein the first set of battery balancing determination signals comprises an up high reference voltage level, and the second set of battery balancing determination signals comprises a down low reference voltage level;
• a voltage balancing unit, including a first balancing electric current unit and a second balancing electric current unit, wherein the first balancing electric current unit is coupled to the first terminal and the connection point, and the second balancing electric current unit is coupled to the second terminal and the connection point;
• a balance judging unit, coupled to the connection point, the battery reference voltage generating unit, and the voltage balancing unit, for controlling the voltage balancing unit so as to make one battery having a lower voltage out of the first battery and the second battery to receive a greater charging current when a voltage level of the connection point is higher than the up high reference voltage level or the voltage level of the connection point is lower than the down low reference voltage level;
• and
• a charging protection unit, outputting a charging signal when a charging current signal, representing the charging current, is higher than a preset current value, so as to activate the balance judging unit.

A battery balance charging controller, for balancing the charging of a first battery and a second battery, wherein a negative terminal of the first battery is connected with a positive terminal of the second battery to form a connection point, a positive terminal of the first battery forms a first terminal, a negative terminal of the second battery forms a second terminal, the battery balance charging controller comprising:

• a battery reference voltage generating unit, for providing a first set of battery balancing determination signals and a second set of battery balancing determination signals, wherein the first set of battery balancing determination signals comprises an up high reference voltage level, and the second set of battery balancing determination signals comprises a down low reference voltage level;
• a voltage balancing unit, including a first balancing electric current unit and a second balancing electric current unit, wherein the first balancing electric current unit is coupled to the first terminal and the connection point, and the second balancing electric current unit is coupled to the second terminal and the connection point;
• a balance judging unit, coupled to the connection point, the battery reference voltage generating unit, and the voltage balancing unit, for controlling the voltage balancing unit so as to make one battery having a lower voltage out of the first battery and the second battery to receive a greater charging current when a voltage level of the connection point is higher than the up high reference voltage level or the voltage level of the connection point is lower than the down low reference voltage level;
• and
• a charging protection unit, coupled to the first battery and the second battery, wherein the charging protection unit detects a voltage difference between the first terminal and the second terminal, and outputs a charging signal when the voltage difference between the first terminal and the second terminal is higher than a preset activation voltage.