Control device and control method for equally charging and discharging battery units

1. A control method for equally charging and discharging battery units of a control device, the control method comprising steps of:

(a) detecting the battery units to generate measuring parameters of the battery units respectively;

(b) calculating determining parameters of the battery units according to the measuring parameters of the battery units respectively;

(c) calculating an average value of the determining parameters of the battery units;

(d) selecting one of the battery units according to an operating status of the battery units, wherein the operating status is a charging status or a discharging status;

(e) calculating a setting parameter according to the determining parameter of the selected battery unit and the average value of the determining parameters;

(f) setting a pause time according to the setting parameter;

(g) stopping charging or discharging the selected battery unit during the pause time; and

(h) charging or discharging the selected battery unit after the pause time.

wherein: the step (d) further comprises steps of:

(d-1) selecting the battery unit having the greatest remaining power when the battery units are charging;

(d-2) selecting the battery unit having the least remaining power when the battery units are discharging;

wherein: the measuring parameters of the battery units are voltages of the battery units, and the determining parameters of the battery units are equal to the measuring parameters of the battery units; in step (d-1), the battery having the greatest voltage is selected; in step (d-2), the battery having the least voltage is selected; wherein when the battery units are charged, the setting parameter is calculated by the following equation:

K

=



(

V

max

-

V

avg

)

×

100

V

avg



where K is the setting parameter and is a positive integer; V max is the voltage of the battery unit having the greatest remaining power; and V avg is the average value; or

wherein: the measuring parameters of the battery units are voltages of the battery units and currents of the battery units; the determining parameters of the battery units are powers of the battery units; the determining parameters are calculated by the following equation:

W 1 =V 1 ×I 1 ; W 2 =V 2 I 2 ; . . . W n =V n ×I n

where W 1 −W n represent the powers of the battery units which are the determining parameters of the battery units; V 1 −V n represent the voltages of the battery units; I 1 −I n represent the currents of the battery units; and n is the number of the battery units; in step (d-1), the battery having the greatest power is selected; in step (d-2), the battery having the least power is selected; wherein when the battery units are charged, the setting parameter is calculated by the following equation

K

=



(

W

max

-

W

avg

)

×

100

W

avg



;

where K is the setting parameter and is a positive integer; W max is the power of the battery unit having the greatest remaining power; and W avg is the average value; or

wherein: the step (a) further comprises steps of: (a-1) detecting the battery units to generate on-load voltages and currents of the battery units; (a-2) respectively turning off first switches of the battery units to detect the battery units to generate no-load voltages of the battery units; the measuring parameters are the on-load voltages, the currents, and the no-load voltages of the battery units; the determining parameters of the battery units are the internal resistances of the battery units, and the determining parameters are calculated by the following equation:

R

1

=

V

1

′

-

V

1

I

1

;

R

1

=

V

2

′

-

V

2

I

2

;

…

⁢

⁢

R

n

=

V

n

′

-

V

n

I

n

;

where R 1− R n represent the internal resistances of the battery units which are the determining parameters of the battery units; V 1− V n represent the on-load voltages of the battery units; I 1− I n represent the currents of the battery units; V 1 ’−V n ’ represent the no-load voltages of the battery units; and n is the number of the battery units; in step (d-1), the battery having the least internal resistance is selected; in step (d-2), the battery having the greatest internal resistance is selected; wherein when the battery units are charged, the setting parameter is calculated by the following equation

K

=



(

R

avg

-

R

min

)

×

100

R

avg



;

where K is the setting parameter and is a positive integer; R min is the power of the battery unit having the least internal resistance; and R avg is the average value.

2. The control method as claimed in claim 1 , further comprising a step of presetting a multiplying parameter;

wherein the pause time is calculated by the following equation:

T off =K×s;

where

T off is the pause time;

K is the setting parameter; and

s is the multiplying parameter.

3. The control method as claimed in claim 1 , wherein when the battery units are discharged, the setting parameter is calculated by the following equation:

K

=



(

V

avg

-

V

min

)

×

100

V

avg



where K is the setting parameter and is a positive integer; V max is the voltage of the battery unit having the greatest remaining power; and V avg is the average value.

4. The control method as claimed in claim 1 , wherein when the battery units are discharged, the setting parameter is calculated by the following equation:

K

=



(

W

avg

-

W

min

)

×

100

W

avg



where K is the setting parameter and is a positive integer; W min is the power of the battery unit having the least remaining power; and W avg is the average value.

5. The control method as claimed in claim 1 , wherein when the battery units are discharged, the setting parameter is calculated by the following equation:

K

=



(

R

max

-

R

avg

)

×

100

R

avg



;

where K is the setting parameter and is a positive integer; R max is the power of the battery unit having the greatest internal resistance; and R avg is the average value.

6. A control device for equally charging and discharging battery units, comprising:

a positive electrode;

a negative electrode;

a plurality of battery units, electronically connected between the positive electrode and the negative electrode; wherein each of the battery units comprises a battery and a first switch electronically connected to the battery in series;

a controlling module, electronically connected to the first switches and the batteries; wherein the controlling module detects the battery units to generate measuring parameters of the battery units respectively, calculates determining parameters of the battery units according to the measuring parameters of the battery units respectively, and calculates an average value of the determining parameters of the battery units;

wherein the controlling module further selects one of the battery units according to an operating status of the battery units, calculates a setting parameter according to the determining parameter of the selected battery unit and the average value of the determining parameters, sets a pause time according to the setting parameter, and turns on the first switch of the selected battery unit after turning off the first switch of the selected battery unit for the pause time;

wherein the operating status is a charging status or a discharging status.

wherein: the controlling module selects the battery unit having the greatest remaining power when the battery units are charged; the controlling module selects the battery unit having the least remaining power when the battery units are discharged;

wherein: the measuring parameters of the battery units are voltages of the battery units, and the determining parameters of the battery units are equal to the measuring parameters of the battery units; the controlling module selects the battery having the greatest voltage as the battery unit having the greatest remaining power; the controlling module selects the battery having the least voltage as the battery unit having the least remaining power; wherein when the battery units are charged, the setting parameter is calculated by the following equation:

K

=



(

V

max

-

V

avg

)

×

100

V

avg



;

where K is the setting parameter and is a positive integer; V max is the voltage of the battery unit having the greatest remaining power; and V avg is the average value; or

wherein: the measuring parameters of the battery units are voltages of the battery units and currents of the battery units; the determining parameters of the battery units are powers of the battery units; the determining parameters are calculated by the following equation:

W 1 =V 1 ×I 1 ; W 2 =V 2 I 2 ; . . . W n =V n ×I n

where W 1 −W n represent the powers of the battery units which are the determining parameters of the battery units; V 1 −V n represent the voltages of the battery units; I 1 −V n represent the currents of the battery units; and n is the number of the battery units; the controlling module selects the battery having the greatest power as the battery unit having the greatest remaining power; the controlling module selects the battery having the least power as the battery unit having the least remaining power; wherein when the battery units are charged, the setting parameter is calculated by the following equation

K

=



(

W

max

-

W

avg

)

×

100

W

avg



;

where K is the setting parameter and is a positive integer; W max is the power of the battery unit having the greatest remaining power; and W avg is the average value; or

wherein: the controlling module further detects the battery units to generate on-load voltages and currents of the battery units, and respectively turns off the first switches of the battery units to detect the battery units to generate no-load voltages of the battery units; the measuring parameters are the on-load voltages, the currents, and the no-load voltages of the battery units; the determining parameters of the battery units are the internal resistances of the battery units, and the determining parameters are calculated by the following equation:

R

1

=

V

1

′

-

V

1

I

1

;

R

1

=

V

2

′

-

V

2

I

2

;

…

⁢

⁢

R

n

=

V

n

′

-

V

n

I

n

;

where R 1 −represent the internal resistances of the battery units which are the determining parameters of the battery units; V 1 −V n represent the on-load voltages of the battery units; I 1 −I n represent the currents of the battery units; V 1 ’−V n ’ represent the no-load voltages of the battery units; and n is the number of the battery units; the controlling module selects the battery having the least internal resistance as the battery unit having the greatest remaining power; the controlling module selects the battery having the greatest internal resistance as the battery unit having the least remaining power; wherein when the battery units are charged, the setting parameter is calculated by the following equation

K

=



(

R

avg

-

R

min

)

×

100

R

avg



;

where K is the setting parameter and is a positive integer; R min is the power of the battery unit having the least internal resistance; and R avg is the average value.

7. The control device as claimed in claim 6 , wherein each of the battery units further comprises:

a first high voltage diode, having an anode and a cathode; wherein the cathode of the first high voltage diode is electronically connected to the positive electrode, and the anode of the first high voltage diode is electronically connected to the negative electrode through the first switch and the battery;

a second switch;

a second high voltage diode, having an anode and a cathode; wherein the anode of the second high voltage diode is electronically connected to the positive electrode, and the cathode of the second high voltage diode is electronically connected to the second switch through which the second high voltage diode can be electronically connected to the first switch and the battery.

8. The control device as claimed in claim 7 , wherein the first switches and the second switches are relays, Insulated Gate Bipolar Transistors, or Metal-Oxide-Semiconductor Field-Effect Transistors.

9. The control device as claimed in claim 6 , wherein the controlling module further presets a multiplying parameter, and the pause time is calculated by the following equation:

T off =K×s;

where

T off is the pause time;

K is the setting parameter; and

s is the multiplying parameter.

10. The control device as claimed in claim 6 , wherein when the battery units are discharged, the setting parameter is calculated by the following equation:

K

=



(

V

avg

-

V

min

)

×

100

V

avg



where K is the setting parameter and is a positive integer; V max is the voltage of the battery unit having the greatest remaining power; and V avg is the average value.

11. The control device as claimed in claim 6 , wherein when the battery units are discharged, the setting parameter is calculated by the following equation:

K

=



(

W

avg

-

W

min

)

×

100

W

avg



;

where K is the setting parameter and is a positive integer; W min is the power of the battery unit having the least remaining power; and W avg is the average value.

12. The control device as claimed in claim 6 , wherein when the battery units are discharged, the setting parameter is calculated by the following equation:

K

=



(

R

max

-

R

avg

)

×

100

R

avg



;

where K is the setting parameter and is a positive integer; R max is the power of the battery unit having the greatest internal resistance; and R avg is the average value.