Apparatus and method of testing for battery

1. An apparatus for testing batteries, comprising:

at least one voltage circuit for measuring voltages of N batteries;

at least one resistance circuit, which is separate from the voltage circuit, for decreasing voltages of batteries into the reference voltage by discharging voltages of batteries, which are greater than a reference voltage, among the N batteries;

a connection switch unit connected to the N batteries and adapted to select any one of the N batteries;

a divert switch unit for separating polarities of each battery connected thereto through the connection switch unit and changing positions of a cathode and an anode of the battery depending on separated polarities;

a selection switch unit for selectively connecting the cathode and anode of the battery, separated by the divert switch unit, to a cathode and an anode of the voltage circuit or the resistance circuit; and

a control unit for controlling the connection switch unit, the divert switch unit, and the selection switch unit, which controls the resistance circuit and decreases the voltage of battery to the reference voltage by discharging voltage of battery when the voltage measured by the voltage circuit is greater than a reference voltage, whereby the voltage circuit transmits the measured voltage of the N batteries into the above control unit.

2. The apparatus according to claim 1 , wherein:

the connection switch unit comprises first to N-th connection switches, first ends of which are connected to cathodes of the N batteries, and an N+1-th connection switch, a first end of which is connected to an anode of the N-th battery, and

second ends of odd-numbered connection switches, among the N+1 connection switches, and second ends of even-numbered connection switches are connected in common to different positions, respectively.

3. The apparatus according to claim 2 , wherein the divert switch unit comprises:

a first divert switch, a first end of which is connected to second ends of the odd-numbered connection switches, thus collecting cathodes of odd-numbered batteries at a single position;

a second divert switch, a first end of which is connected to second ends of the odd-numbered connection switches, thus collecting anodes of the odd-numbered battery at a single position;

a third divert switch, a first end of which is connected to second ends of the even-numbered connection switches, thus collecting cathodes of even-numbered batteries at a single position; and

a fourth divert Switch, a first end of which is connected to second ends of the even-numbered connection switches, thus collecting anodes of the even-numbered batteries at a single position.

4. The apparatus according to claim 3 , wherein the second ends of the odd-numbered connection switches and first ends of the first divert switch and the second divert switch are connected in common to a first node, and the second ends of the even-numbered connection switches and first ends of the third divert switch and the fourth divert switch are connected in common to a second node.

5. The apparatus according to claim 4 , wherein the first and second nodes are formed in either one of the connection switch unit and the divert switch unit.

6. The apparatus according to claim 4 , wherein the first and second nodes are formed between the connection switch unit and the divert switch unit.

7. The apparatus according to claim 4 , wherein second ends of the first divert switch and the third divert switch are connected in common to each other, and second ends of the second divert switch and the fourth divert switch are connected in common to each other.

8. The apparatus according to claim 3 , wherein the selection switch unit comprises:

a first selection switch, a first end of which is connected to second ends of the first divert switch and the third divert switch, and a second end of which is connected to an cathode of the voltage circuit;

a second selection switch, a first end of which is connected to second ends of the second divert switch and the fourth divert switch, and a second end of which is connected to a anode of the voltage circuit;

a third selection switch, a first end of which is connected to second ends of the first divert switch and the third divert switch, and a second end of which is connected to an cathode of the resistance circuit; and

a fourth selection switch, a first end of which is connected to second ends of the second divert switch and the fourth divert switch, and a second end of which is connected to a anode of the resistance circuit.

9. The apparatus according to claim 8 , wherein second ends of the first divert switch and the third divert switch and first ends of the first selection switch and the third selection switch are connected in common to a third node, and second ends of the second divert switch and the fourth divert switch and first ends of the second selection switch and the fourth selection switch are connected in common to a fourth node.

10. The apparatus according to claim 9 , wherein the third and fourth nodes are formed in either one of the divert switch unit and the selection switch unit.

11. The apparatus according to claim 9 , wherein the third and fourth nodes are formed between the divert switch unit and the selection switch unit.

12. The apparatus according to claim 4 , further comprising:

a display unit for displaying discharged states of the batteries, wherein

the control unit controls the display unit in response to a discharging signal provided by the resistance circuit.

13. A method of testing batteries, comprising the steps of:

selecting any one of N batteries by the control unit's controlling of the connection switch Unit, divert switch unit, and selection switch unit;

measuring a voltage of the selected battery and transmitting it to the control unit by the voltage circuit; and

controlling the resistance circuit which is separate from the voltage circuit by the control unit and decreasing the voltage of the battery to the reference voltage by discharging the voltage of the battery when the measured voltage is greater than a reference voltage.

14. The method according to claim 13 , wherein the voltage measuring step comprises the step of sequentially measuring voltages of the N batteries in order from the first to N-th batteries.

15. The method according to claim 14 , further comprising the step of separating polarities of the selected battery, and changing positions of a cathode and an anode of the selected battery depending on the separated polarities.

16. An apparatus for testing batteries, comprising:

at least one voltage circuit for measuring voltages of N batteries;

at least one resistance circuit, which is separate from the voltage circuit, for decreasing voltages of batteries into the reference voltage by discharging voltages of batteries, which are greater than a reference voltage, among the N batteries;

a connection switch unit connected to the N batteries and adapted to select any one of the N batteries;

a divert switch unit for separating polarities of each battery connected thereto through the connection switch unit and changing positions of a cathode and an anode of the battery depending on separated polarities;

a selection switch unit for selectively connecting the cathode and anode of the battery, separated by the divert switch unit, to a cathode and an anode of the voltage circuit or the resistance circuit;

at least one charging circuit for charging batteries, having voltages which are less than the reference voltage among the N batteries, to the reference voltage;

a display unit for displaying charged and discharged states of the batteries; and

a control unit for controlling the display unit in response to a discharging signal and a charging signal, which are provided by the resistance circuit and the charging circuit, respectively, while controlling the connection switch unit, the divert switch unit and the selection switch unit, which controls the resistance circuit and decreases the voltage of the battery to the reference voltage by discharging the voltage of battery when the measured voltage is greater than a reference voltage, whereby the voltage circuit transmits the measured voltage of the N batteries into the above control unit.

17. The apparatus according to claim 16 , wherein:

the connection switch unit comprises first to N-th connection switches, first ends of which are connected to cathodes of the N batteries, and an N+1-th connection switch, a first end of which is connected to an anode of the N-th battery, and

second ends of odd-numbered connection switches, among the N+1 connection switches, and second ends of even-numbered connection switches are connected in common to different positions, respectively.

18. The apparatus according to claim 17 , wherein the divert switch unit comprises:

a first divert switch, a first end of which is connected to second ends of the odd-numbered connection switches, thus collecting cathodes of odd-numbered batteries at a single position;

a second divert switch, a first end of which is connected to second ends of the odd-numbered connection switches, thus collecting anodes of the odd-numbered battery at a single position;

a third divert switch, a first end of which is connected to second ends of the even-numbered connection switches, thus collecting cathodes of even-numbered batteries at a single position; and

a fourth divert switch, a first end of which is connected to second ends of the even-numbered connection switches, thus collecting anodes of the even-numbered batteries at a single position.

19. The apparatus according to claim 18 , wherein:

the second ends of the odd-numbered connection switches and first ends of the first divert switch and the second divert switch are connected in common to a first node, and

the second ends of the even-numbered connection switches and first ends of the third divert switch and the fourth divert switch are connected in common to a second node.

20. The apparatus according to claim 19 , wherein the selection switch unit comprises:

a first selection switch, a first end of which is connected to second ends of the first divert switch and the third divert switch, and a second end of which is connected to a cathode of the voltage circuit;

a second selection switch, a first end of which is connected to second ends of the second divert switch and the fourth divert switch, and a second end of which is connected to an anode of the voltage circuit;

a third selection switch, a first end of which is connected to second ends of the first divert switch and the third divert switch, and a second end of which is connected to a cathode of the resistance circuit;

a fourth selection switch, a first end of which is connected to second ends of the second divert switch and the fourth divert switch, and a second end of which is connected to an anode of the resistance circuit;

a fifth selection switch, a first end of which is connected to second ends of the first divert switch and the third divert switch, and a second end of which is connected to a cathode of the charging circuit; and

a sixth selection switch, a first end of which is connected to second ends of the second divert switch and the fourth divert switch, and a second end of which is connected to an anode of the charging circuit.

21. The apparatus according to claim 19 , wherein the first and second nodes are formed in either one of the connection switch unit and the divert switch unit.

22. The apparatus according to claim 19 , wherein the first and second nodes are formed between the connection switch unit and the divert switch unit.

23. The apparatus according to claim 19 , wherein second ends of the first divert switch and the third divert switch are connected in common to each other, and second ends of the second divert switch and the fourth divert switch are connected in common to each other.

24. The apparatus according to claim 16 , wherein voltage circuits, resistance circuits, and charging circuits can each be used in a number ranging from 2 to N.