KR102126934B1 - Battery Cell Balance Apparatus - Google Patents

Abstract

In the present invention, a battery cell balance device, comprising: a charger (30) for supplying direct current power to charge a plurality of battery cells from an alternating current (AC) power source; Battery cells 11 to 15 in which n cylindrical lithium-ion batteries are connected in series to (+) DC power of the charger 30; A switch unit 21 to 25 in which a negative terminal of the battery cells 11 to 15 and a source terminal are connected, and a drain terminal is connected to a negative DC power source of the charger 30; Reverse-parallel diodes 21-2 to 25-2 connected to a cathode at an anode in the direction of (-) direct current power of the charger 30 at the (-) side of the battery cells 11 to 15 ); Upper resistors 81,83,85,87,89 connected between the gate terminal of the switch unit 21-25 and the second gate terminal G2; A battery cell balance device including a lower resistance (82,84,86,88,90) connected between the gate terminal of the switch unit (21-25) and the (-) side of the battery cells (11-15) is proposed. do.

Description

Battery cell balance device {Battery Cell Balance Apparatus}

The present invention relates to a battery cell balance device for uniformly charging or discharging voltages of a plurality of battery cells. Above all, when the charge or discharge voltages are not balanced in a plurality of battery cells, heat generation, battery swelling, and battery explosion problems in the specific battery cell due to overcharging or overdischarging of the specific battery cell This can happen. Therefore, the present invention relates to a battery cell balance circuit for preventing this phenomenon.

The following prior art documents exist with respect to the existing battery balancing device.

As a related prior document, Republic of Korea Patent Registration No. 10-1720960, Announcement Date 2017. 03. 29. (hereinafter referred to as [Patent Document 1]), Balancing current variable battery pack equal charging device and method are disclosed. . In the [Patent Document 1], the balancing current is variablely adjusted according to the voltage difference between battery cells, and the battery voltage received by the charger, the balancing unit, the voltage monitoring unit and the voltage monitoring unit is input for uniform charging of the battery pack. A battery pack equal charging device and method including an integrated control unit for determining a cell and a balancing current amount and diagnosing a failure of a balancing transistor has been proposed.

In addition, Republic of Korea Patent Publication No. 10-1865969, published on June 6, 2018 (hereinafter referred to as [Patent Document 2]) discloses a battery voltage balancing (Balancing) device humming method. In [Patent Document 2], a plurality of first capacitors respectively connected in parallel to a plurality of batteries 100; A discharge unit connected to the first capacitor through a switching mechanism and selectively connected in parallel to each first capacitor; A measuring unit comprising a second capacitor and a voltage measuring circuit connected in parallel with the discharge unit; We proposed a control unit that balances the voltage by connecting a battery with a relatively high voltage to the consumption resistance.

In addition, the Republic of Korea Patent Publication No. 10-1326802, published on November 11, 2013 (hereinafter referred to as [Patent Document 3]) discloses the voltage balancing (Valancing) circuit of the vehicle battery. In [Patent Document 3], an average voltage measurement circuit that outputs an average voltage of the cell battery module in a voltage balancing circuit of a vehicle battery including a cell battery module; A balancing circuit for balancing the corresponding cell battery; A comparator comparing the average voltage of the cell battery module; A voltage balancing circuit of a vehicle battery including an input terminal connected to one terminal of the cell cell and a switching element connected to the other terminal through a balancing resistor is proposed.

In [Patent Documents 1] to [Patent Documents 3], voltage balancing between batteries is performed by detecting the voltage of the battery in series connection of the battery, but the voltage balancing is not smooth even in parallel connection of the batteries. there was.

[Patent Document 1] Republic of Korea Registered Patent Publication No. 10-1720960, Announcement Date 2017. 03. 29. [Patent Document 2] Republic of Korea Registered Patent Publication No. 10-1865969, Announcement Date 2018. 06. 11. [Patent Document 3] Korean Registered Patent Publication No. 10-1326802, Announcement Date 2013. 11. 11.

The battery cell balance device proposed in the present invention is intended to solve the following. First, the phenomenon of overcharging does not occur in the plurality of battery cells 11 to 15, and the charging voltage is constant in the plurality of battery cells 11 to 15, and second, the plurality of batteries The phenomenon of over-discharge does not occur in the cells 11 to 15, and the discharge voltage is constant in the plurality of battery cells 11 to 15. Third, it is not a method of directly detecting a voltage of a specific individual battery, and a battery cell balance that uniformly charges or discharges the voltage of the individual battery cells while detecting the voltages of the plurality of battery cells 11 to 15 Suggest the device. Fourth, through this, (特定) to provide a battery cell balance device that can fundamentally solve the problem of heat generation, battery swelling and battery explosion of the battery.

In the present invention, the plurality of switch units (21 to 25) connected to the plurality of battery cells (11 to 15), respectively, in series has the greatest technical feature. Voltage detection resistors 81 to 90 for detecting voltages of the plurality of battery cells 11 to 15 are positioned around the gate terminals of the plurality of switch units 21 to 25. The voltage detection resistors 81 to 90 detect the voltages of the plurality of battery cells 11 to 15 in real time. In particular, a resistor for detecting a voltage of a specific battery cell is located at a gate terminal of a specific switch unit.

(1) When charging the plurality of battery cells 11 to 15, when the voltage of the specific battery cell is high, that is, in an overcharge state, the voltage detection resistors 81 to 90 are relatively As a low voltage is applied in the (+) direction, the switch of the specific switch part is turned off, so that the charging of the specific battery cell is made less, and the switch of the specific switch part is turned off. The rest of the switches 21-1 to 25-1 are turned on because a high voltage is applied in a relatively (+) direction. In particular, the technical feature is that the duty of a switch connected to a specific battery cell having the lowest voltage of the battery cell is turned on the most. Through this, when charging the plurality of battery cells 11 to 15, the whole is uniformly charged as a solution to the problem in the present invention.

(2) When a plurality of battery cells 11 to 15 are discharged, when the voltage of the specific battery cell is low, that is, in an over-discharge state, the voltage detection resistors 81 to 90 Since a relatively high voltage is applied in the (-) direction, the switch of the specific switch part is turned off so that the specific battery cell is not discharged, and the specific switch part The rest of the switches 21-1 to 25-1 except the switch are discharged because they are turned on because a low voltage is applied in a relatively negative (-) direction. Through this, when the plurality of battery cells 11 to 15 are discharged, it is considered as a solution to the problem in the present invention that the entire discharge is uniform.

The battery cell balance device proposed in the present invention, first, the phenomenon of overcharging does not occur in the plurality of battery cells 11 to 15, and the charging voltage in the plurality of battery cells 11 to 15 is constant ( Second, the phenomenon of over-discharge does not occur in the plurality of battery cells 11 to 15, and the discharge voltage is constant in the plurality of battery cells 11 to 15. do. Third, it is not a method of directly detecting a voltage of a specific individual battery, and a battery cell balance that uniformly charges or discharges the voltage of the individual battery cells while detecting the voltages of the plurality of battery cells 11 to 15 Suggest the device. Fourth, there is a very elevated effect that can fundamentally solve the problem of heat generation, battery inflation, and battery explosion through (特定) battery.

1 is an energy storage device using an 18650 lithium-ion battery
2 is a battery cell balance device proposed in the present invention
3 is a detailed control circuit for controlling the overcharge control switch 26
4 is a detailed control circuit for controlling the over-discharge control switch 27 and the first to fifth switch units 21 to 25
Figure 5 is a printed wiring circuit board (Printed Circuit Board) pattern for a battery cell balance device proposed in the present invention
6 is a detailed specification (Spec.) of the overcharge and overdischarge control switches 26 and 27 and the first to fifth switch units 21 to 25 in the present invention.

If described in detail with reference to the accompanying drawings the present invention.

1 shows an energy storage device using an 18650 lithium-ion battery. The 18650 lithium-ion battery is a cylindrical standard lithium-ion battery with a diameter of 18 [mm] and a length of 65 [mm]. The energy storage device using the 18650 lithium-ion battery is composed of first to third battery cells 11 to 13, first to fourth battery cells 11 to 14, or first to fifth batteries The battery cells may be extended to cells 11 to 15, first to sixth battery cells 11 to 16, or the like. In particular, the 18650 lithium-ion batteries inside the battery cells 11 to 16 are connected in series, and each of the battery cells 11 to 16 is connected in parallel with each other.

Above all, the cell balance circuit 20 (also known as a battery management system (BMS)) is essential for balancing the current of each of the battery cells 11 to 16, and through the connection terminal 31 It is connected to the charger 30 and receives AC (AC) electricity through the AC (AC) plug 40 and stores it in each of the battery cells 11 to 16.

Particularly, when an energy storage device using an 18650 lithium-ion battery is charged without a cell balance circuit 20 (aka a battery management system (BMS)), the internal impedance is different. (特定) Overcharge and over-discharge phenomenon occurs in the battery cells 11 to 15 or the specific 18650 lithium-ion battery, and thereby the specific battery cells 11 to 15 15) In certain 18650 lithium-ion batteries, heat generation, battery swelling, and battery explosion may occur.

Therefore, in an energy storage device using an 18650 lithium-ion battery, a cell balance circuit 20 (aka a battery management system (BMS)) is essential.

2 shows a battery cell balance device proposed in the present invention.

In the proposed battery cell balance device, n 18650 lithium-ion batteries are connected in series to form a battery cell. Most of all, the biggest technical feature is that the switch units 21 to 25 are connected to the negative side of the battery cell.

More specifically, the first battery cell 11 is composed of n 18650 batteries. 18650 batteries (11-1,11-2,11-) of (1-1,2,3,...,(n-1),n) in the first battery cell from (+) DC power to (-) DC power 3,...,11-(n-1),11-n) are connected. Here, n is a natural number of 2 or more. In addition, in parallel with the first battery cell 11, the second battery cell 12 is composed of n 18650 batteries, and is applied to the second battery cell in the direction of ((+) DC power to (-) DC power). 18650 batteries (12-1,12-2,12-3,...,12-(n-1),12-n) of ,2,3,...,(n-1),n In addition, the first and second battery cells 11 and 12 may be connected to the third, fourth, and fifth battery cells 13, 14, and 15 composed of n 18650 batteries, respectively, in parallel. The voltage increases when the 18650 battery is connected in series in a battery cell, and the current increases when the battery cells are connected in parallel.

The biggest technical feature of the present invention is that n 18650 lithium-ion batteries are connected in series, so that the source terminals of the switch units 21 to 25 are connected to the (-) side of the battery cells in the battery cells. In the battery cell of the present invention, n 18650 lithium-ion batteries are connected in series to (+) DC power, so that the battery cells 11 to 15 are connected, and on the (-) side of the battery cells 11 to 15 The source terminals of the switch units 21 to 25 are connected. DC power is connected to the drain terminal of the switch units 21 to 25. The reverse-parallel diodes 21-2 to 25-2 of the switch units 21 to 25 are cathodes at an anode with a (-) direct current power at the (-) side of the battery cells 11 to 15. ) Is characterized by being connected.

In addition, the upper terminal (81,83,85,87,89) and the lower resistance (82,84,86,88,90) are disposed at the gate terminal of the switch unit (21 to 25), the upper resistance (81 ,83,85,87,89 are connected to the second gate terminal G2 and the gate terminals of the switch units 21 to 25, and the lower resistors 82,84,86,88,90 are the The biggest technical feature is that it is connected to the gate terminal of the switch unit (21 to 25) and the (-) side of the battery cell.

The upper resistance (81,83,85,87,89) and the lower resistance (which detects the voltage of the plurality of battery cells (11 to 15) around the gate terminals of the plurality of switch units (21 to 25) ( 82,84,86,88,90), the voltage detection resistors 81 to 90 are located. The voltage detection resistors 81 to 90 detect the voltages of the plurality of battery cells 11 to 15 in real time. In particular, a resistor for detecting a voltage of a specific battery cell is located at a gate terminal of a specific switch unit.

(1) When charging the plurality of battery cells 11 to 15, when the voltage of the specific battery cell is high, that is, in an overcharge state, the voltage detection resistors 81 to 90 are relatively As a low voltage is applied in the (+) direction, the switch of the specific switch part is turned off so that charging of the specific battery cell is made less, and the switch of the specific switch part The rest of the switches 21-1 to 25-1 are turned on because a high voltage is applied in a relatively (+) direction. In particular, the technical feature is that the duty of a switch connected to a specific battery cell having the lowest voltage of the battery cell is turned on the most. Through this, when charging the plurality of battery cells (11 to 15), it is a technical feature in the present invention to be uniformly charged as a whole.

(2) When a plurality of battery cells 11 to 15 are discharged, when the voltage of the specific battery cell is low, that is, in an over-discharge state, the voltage detection resistors 81 to 90 Since a relatively high voltage is applied in the (-) direction, the switch of the specific switch part is turned off so that no discharge of the specific battery cell is possible, and the specific switch part The rest of the switches (21-1 to 25-1) except the switch is characterized in that the discharge is discharged because the conduction (On) because a low voltage is applied in a relatively (-) direction. Through this, when the plurality of battery cells 11 to 15 are discharged, it is a technical feature of the present invention that the whole is uniformly discharged.

In the battery cell balance device proposed in the present invention, an overcharge control switch 26 and an overdischarge control switch 27 are arranged in series with (-) DC power. The drain terminal of the overcharge control switch 26 and the drain terminal of the overdischarge control switch 27 are connected to each other. The overcharge control switch 26 directly controls overcharge of the battery cells 11 to 15, and the overcharge control switch 27 overcharges the battery cells 11 to 15. It is characterized by directly controlling the electric power. The overcharge control switch 26, the overdischarge control switch 27, and the switch portions 21 to 25 are directly controlled by the cell balance controller 50.

The battery cell balance device proposed in the present invention receives AC (AC) power from an AC (AC) plug 40, and the output of the charger 30 is supplied to the battery cell balance device by a connection terminal 31. . The main voltage at the connection terminal 31 is applied between a (+) DC power supply and a (-) DC power supply, and the n 18650 lithium-ion batteries are connected in series to charge a battery cell. Also, Vcc(+)[(+) control power] and Vcc(-)[(-) control power] are supplied through the first diode D1, and the cell balance controller 50 is driven. In particular, Vcc(+) [(+) control power] and Vcc(-) [(-) control power] are stabilized by the bank capacitor 51.

3 shows a detailed control circuit for controlling the overcharge control switch 26.

The configuration of the detailed control circuit 60 for controlling the overcharge control switch 26 is 24,25 that divides Vcc(+)[(+) control power] and Vcc(-)[(-) control power]. A reference voltage is generated through the resistors R24 and R25. The 24th resistor R24 is a variable resistor and changes the reference voltage. The reference voltage generated through the 24th and 25th resistors R24 and R25 is applied to a base terminal of the first P-type transistor 61, and an emitter of the first P-type transistor 61 is applied. ) A Zener diode 64 is connected to the terminal. In addition, the collector terminal of the first P-type transistor 61 is connected to the base terminal of the second N-type transistor 62.

In the normal charging state other than the overcharge state, the first gate terminal G1 maintains a turn-on state of the overcharge control switch 26 by Vcc(+) ((+) control power). However, in overcharging, the voltage of Vcc(+) ((+) control power supply) increases, which causes the Zener diode 64 to conduct, and the first P-type transistor 61 operates. Due to this, the first gate terminal G1 is applied with a voltage of 0 (Zero), and the first gate terminal G1 is applied with a voltage of 0 (Zero), so the overcharge control switch 26 has a turn off state. Therefore, it is a technical feature that the overcharge of the battery cells 11 to 15 can be prevented. In addition, it can be confirmed that the first LED 63 emits light when the overcharge control switch 26 is turned off, and prevents overcharge.

In the present invention, the detailed control circuit 60 for controlling the overcharge control switch 26 can prevent overcharge by the operation of the first P-type transistor 61 and the second N-type transistor 62. have.

4 shows a detailed control circuit for controlling the over-discharge control switch 27 and the first to fifth switch units 21 to 25. The over-discharge control switch 27 and the first to fifth switch units 21 to 25 are

The control voltage Vcont is input to the base terminal of the third N-type transistor 71, and the collector terminal of the third N-type transistor 71 is the base of the fourth N-type transistor 72. It is characterized by being input to the (Base) terminal.

In a general discharge state other than the overdischarge state, the overdischarge control switch 27 is maintained in a turn-on state by Vcc(+) ((+) control power supply). However, when an over-discharge state is detected, the control voltage Vcont is input to the base terminal of the third N-type transistor 71. At the same time, the fourth N-type transistor 72 is conductive. Since the second gate terminal G2 is applied with a voltage of 0 (Zero), the over-discharge control switch 27 is turned off, and all of the first to fifth switch units 21 to 25 are simultaneously turned off. Turn off (Trun off) state. Through this, it is a technical feature that overdischarge does not occur fundamentally.

In the present invention, detailed control circuits for controlling the over-discharge control switch 27 and the first to fifth switch units 21 to 25 are used for the operation of the third N-type transistor 71 and the fourth N-type transistor 72. Thereby, over-discharge can be prevented. In addition, the over-discharge control switch 27 can be confirmed that the second LED 73 emits light in a turn-off state and prevents over-discharge.

Figure 5 shows a printed circuit board (Printed Circuit Board) pattern for a battery cell balance device proposed in the present invention, Figure 6 is an overcharge and overdischarge control switch (26,27) and the first to fifth in the present invention The detailed specifications of the switch units 21 to 25 are shown.

The overcharge and overdischarge control switches 26 and 27 and the first to fifth switch parts 21 to 25 used in the present invention are MOSFETs of the TO-220 type and above all, drain and source of the switch. It is characterized by a very small internal resistance (RDS) between (Source) of 12 [Miohm] and 24 [Miohm]. This has a voltage drop of 1.3[V] to 1.8[V] of the anti-parallel diode located between the drain and the source. Therefore, when the current flows from the source to the drain in the turn-on state, the internal resistance (RDS) between the drain and the source of the switch rather than flowing through the anti-parallel diode. ).

Therefore, when charging the plurality of battery cells 11 to 15 in the present invention, when the voltage of the specific battery cell is high, that is, in the overcharge state, the voltage detection resistors 81 to 90 are Since a relatively low voltage is applied in the (+) direction, the switch of the specific switch part is turned off so that charging of the specific battery cell is made less, and the specific switch part The switches 21-1 to 25-1 except the switch are turned on because a high voltage is applied in a relatively (+) direction. In particular, the duty of the switch connected to a specific battery cell having the lowest voltage of the battery cell is most conductive (On). Eventually, when charging, a specific battery cell with a relatively high voltage is switched off, and is charged through an anti-parallel diode, and a battery cell with a relatively low voltage is switched on, so that the switch is turned on. Charging through. Therefore, the impedance generated by the internal resistance (RDS) [12 [microohm] and 24 [microohm]] between the drain and source of the switch is the voltage drop of the antiparallel diode [1.3 [V]. ~ 1.8 [V]] is less than the impedance (Impedance), and by controlling this, when charging the plurality of battery cells (11 to 15), the overall technical feature is to uniformly charge the whole.

In the present invention, a battery cell balance device, comprising: a charger (30) for supplying direct current power to charge a plurality of battery cells from an alternating current (AC) power source; Battery cells 11 to 15 in which n cylindrical lithium-ion batteries are connected in series to (+) DC power of the charger 30; A switch unit 21 to 25 in which a negative terminal of the battery cells 11 to 15 and a source terminal are connected, and a drain terminal is connected to a negative DC power source of the charger 30; Reverse-parallel diodes 21-2 to 25-2 connected to a cathode at an anode in the direction of (-) direct current power of the charger 30 at the (-) side of the battery cells 11 to 15 ); Upper resistors 81,83,85,87,89 connected between the gate terminal of the switch unit 21-25 and the second gate terminal G2; A battery cell balance device including a lower resistance (82,84,86,88,90) connected between the gate terminal of the switch unit (21-25) and the (-) side of the battery cells (11-15) is proposed. I want to.

The present invention can be applied to a battery cell balance device by a variety of modifications to those skilled in the art, it should be recognized that the scope of the technically easily modified technology also falls within the scope of this patent.

11: first battery cell
11-1: The first 18650 battery in the first battery cell
11-2: Second 18650 battery in the first battery cell
11-3: Third 18650 battery in the first battery cell
11-(n-1): 18650 battery of (n-1) to the first battery cell
11-n: the nth 18650 battery in the first battery cell
12: second battery cell
12-1: The first 18650 battery in the second battery cell
12-2: Second 18650 battery in the second battery cell
12-3: Third 18650 battery in the second battery cell
12-(n-1): 18650 battery of the (n-1) second battery cell
12-n: the nth 18650 battery in the second battery cell
13: third battery cell
13-1: The first 18650 battery in the third battery cell
13-2: Second 18650 battery in third battery cell
13-3: Third 18650 battery in third battery cell
13-(n-1): 18650 battery of the (n-1) third battery cell
13-n: the nth 18650 battery in the third battery cell
14: fourth battery cell
14-1: the first 18650 battery in the fourth battery cell
14-2: Second 18650 battery to fourth battery cell
14-3: Third 18650 battery in fourth battery cell
14-(n-1): 18650 battery of the (n-1) to the 4th battery cell
14-n: the nth 18650 battery in the 4th battery cell
15: fifth battery cell
15-1: the first 18650 battery in the fifth battery cell
15-2: Second 18650 battery to fifth battery cell
15-3: Third 18650 battery in fifth battery cell
15-(n-1): 18650 battery of the (n-1) to the 5th battery cell
15-n: nth 18650 battery in 5th battery cell
16: 6th battery cell
16-1: the first 18650 battery in the sixth battery cell
16-2: Second 18650 battery to sixth battery cell
16-3: Third 18650 battery in sixth battery cell
16-(n-1): 6th battery cell with (n-1) 18650 battery
16-n: nth 18650 battery in 6th battery cell
20: cell balance circuit
21 to 25: switch unit
21-1 to 25-1: Switch
21-2 to 25-2: anti-parallel diode
21: first switch unit
21-1: 1st switch
21-2: first antiparallel diode
22: second switch unit
22-1: Second switch
22-2: second anti-parallel diode
23: third switch unit
23-1: Third switch
23-2: Third antiparallel diode
24: fourth switch unit
24-1: 4th switch
24-2: fourth antiparallel diode
25: fifth switch unit
25-1: 5th switch
25-2: fifth anti-parallel diode
26: overcharge control switch
27: over discharge control switch
30: charger
31: connection terminal
40: AC (AC) plug
50: cell balance controller
51: bank capacitor
60: detailed control circuit for controlling the overcharge control switch
61: first P-type transistor
62: second N-type transistor
63: 1st LED
64 Zener diode
70: detailed control circuit for controlling the over-discharge control switch and the first to fifth switch parts
71: third N-type transistor
72: fourth N-type transistor
73: second LED
81: upper resistance of the first battery cell
82: lower resistance of the first battery cell
83: upper resistance of the second battery cell
84: lower resistance of the second battery cell
85: upper resistance of the third battery cell
86: lower resistance of the third battery cell
87: upper resistance of the fourth battery cell
88: lower resistance of the fourth battery cell
89: upper resistance of the fourth battery cell
90: lower resistance of the fourth battery cell
D1: first diode
D2: second diode
C1: first capacitor
C2: Second capacitor
C21: 4th capacitor
R1: first resistance
R2: Second resistance
R3: Third resistance
R4: 4th resistance
R5: 5th resistance
R21: 21st resistance
R22: 22nd resistor
R23: 23rd resistance
R24: 24th resistance
R25: 25th resistance
R31: 31st resistance
R32: 32nd resistor
R33: 33rd resistance
R34: 34th resistance
R35: 35th resistance
G1: first gate terminal
G2: second gate terminal
Vcc(+): (+) control power
Vcc(-): (-) control power
Vcont: Control voltage
(+): (+) DC power
(-): (-) DC power

Claims (12)

In the battery cell balance device,
A charger 30 that supplies DC power to charge a plurality of battery cells from AC power;
A plurality of battery cells 11 to 15 connected in parallel to the direct current power source of the charger 30, each battery cell comprising n cylindrical lithium-ion batteries connected in series, a battery cell 11 to 15;
The (-) side of the battery cells 11 to 15 and a source (Source) terminal is connected, the drain (Drain) terminal through the over-discharge control switch 27 to the (-) DC power of the charger 30 Connected switch units 21 to 25;
Reverse-parallel diodes 21-2 to 25-2 connected to a cathode at an anode in the direction of (-) direct current power of the charger 30 at the (-) side of the battery cells 11 to 15 );
Upper resistances 81, 83, 85, 87 and 89 connected between the gate terminal of the switch unit 21 to 25 and the second gate terminal G2 which is the gate terminal of the over-discharge control switch 27; And
And a lower resistance (82,84,86,88,90) connected between the gate terminal of the switch part (21-25) and the (-) side of the battery cells (11-15),
The number of the battery cells (11 to 15) is a plurality of two or more, battery cell balance device connected in parallel with each other. delete The method according to claim 1,
When the voltage of the first specific battery cell is relatively high in the charged state of the battery cells 11 to 15, the upper resistance 81,83,85,87,89 and the lower resistance 82,84 ,86,88,90) since a relatively low voltage is applied in the (+) direction, the switch of the first specific switch part is turned off so that the charging of the first specific battery cell is Battery cell balance device, characterized in that made less. The method according to claim 3,
The rest of the switches 21-1 to 25-1 except the first specific switch part switch are turned on because a high voltage is applied in a relatively (+) direction, so that a plurality of battery cells 11 to 15 are used as a whole. ) The battery cell balance device characterized in that it is uniformly charged. The method according to claim 1,
When the voltage of the second specific battery cell is relatively low in the discharge state of the battery cells 11 to 15, the upper resistance 81,83,85,87,89 and the lower resistance 82,84 ,86,88,90) since a relatively high voltage is applied in the (-) direction, the switch of the second specific switch part is turned off to discharge the second specific battery cell. Battery cell balance device, characterized in that is not. The method according to claim 5,
The rest of the switches 21-1 to 25-1, except for the second specific switch part switch, are turned on because a relatively low voltage is applied in the (-) direction, so that a plurality of battery cells 11 to 15 are provided as a whole. ) Is uniformly discharged (妨電), characterized in that the battery cell balance device. In the battery cell balance device,
A plurality of battery cells 11 to 15 connected in parallel to a direct current power source of the charger 30, each battery cell comprising n cylindrical lithium-ion batteries connected in series, a battery cell 11 to 15;
The (-) side of the battery cells 11 to 15 and a source (Source) terminal is connected, the drain (Drain) terminal through the over-discharge control switch 27 to the (-) DC power of the charger 30 Connected switch units 21 to 25;
Reverse-parallel diodes 21-2 to 25-2 connected to a cathode at an anode in the direction of (-) direct current power of the charger 30 at the (-) side of the battery cells 11 to 15 );
Upper resistances 81, 83, 85, 87 and 89 connected between the gate terminal of the switch unit 21 to 25 and the second gate terminal G2 which is the gate terminal of the over-discharge control switch 27; And
A lower resistance (82,84,86,88,90) connected between the gate terminal of the switch part (21-25) and the (-) side of the battery cells (11-15);
It includes,
The number of the battery cells 11 to 15 is a plurality of two or more, connected in parallel to each other,
When the voltage of the first specific battery cell is high in the charged state of the battery cells 11 to 15, the upper resistance 81,83,85,87,89 and the lower resistance 82,84,86 ,88,90) since the relatively low voltage is applied in the (+) direction, the switch of the first specific switch part is turned off so that the charging of the first specific battery cell is made less. Lose;
When the voltage of the second specific battery cell is low in the discharged state of the battery cells 11 to 15, the upper resistance 81,83,85,87,89 and the lower resistance 82,84,86 ,88,90) since a relatively high voltage is applied in the (-) direction, the switch of the second specific switch part is turned off, so that the second specific battery cell is not discharged. Battery cell balance device characterized in that it does not. The method according to claim 1,
The (-) DC power supply of the charger 30 includes an overcharge control switch 26 for directly controlling overcharge and an overdischarge control switch 27 for directly controlling overdischarge. Battery cell balance device, characterized in that located. The method according to claim 7,
The (-) DC power supply of the charger 30 includes an overcharge control switch 26 for directly controlling overcharge and an overdischarge control switch 27 for directly controlling overdischarge. Battery cell balance device, characterized in that located. The method according to claim 8 or claim 9,
The battery cell balance device, characterized in that the drain (Drain) terminal of the overcharge control switch 26 and the drain (Drain) terminal of the overdischarge control switch 27 are directly connected. The method according to claim 8 or claim 9,
In order to control the overcharge control switch 26, the reference voltage (Vref) is divided by dividing Vcc(+)[(+) control power] and Vcc(-)[(-) control power] of the cell balance device. 24, 25 resistors (R24, R25) to generate;
A first P-type transistor 61 having a base terminal to which the reference voltage Vref is input; And
A second N-type transistor having a base terminal connected to a collector terminal of the first P-type transistor 61 and a collector terminal connected to a first gate terminal G1 of the overcharge control switch 26 (62);
Battery cell balance device comprising a. The method according to claim 8 or claim 9,
A third N-type transistor 71 having a base terminal to which a control voltage Vcont is applied to control the over-discharge control switch 27; And
A fourth N-type having a base terminal connected to a collector terminal of the third N-type transistor 71 and a collector terminal connected to a second gate terminal G2 of the over-discharge control switch 27 Transistor 72;
Battery cell balance device comprising a.

Images