KR20180058040A - Apparatus for blancing battery - Google Patents

Abstract

The present invention relates to a battery balancing apparatus. A battery balancing apparatus for balancing a voltage between a plurality of battery cells connected in series according to an embodiment of the present invention comprises a plurality of balancing circuits including a balancing resistor and a balancing switch which are connected in series, being connected in parallel to each of the plurality of battery cells for balancing a voltage between the plurality of battery cells; a plurality of distribution resistors connected in series for each outputting an accumulative average voltage obtained by successively accumulating average voltages of the plurality of battery cells; a plurality of comparators for receiving an accumulative cell voltage obtained by sequentially accumulating the voltages of the plurality of battery cells outputted from each of the plurality of battery cells and an accumulative mean voltage outputted from each of the plurality of distribution resistors and for each outputting a comparison signal by comparing accumulative cell voltage and the accumulative mean voltage; and a plurality of logic circuits for each receiving the comparison signals outputted from the plurality of comparators and outputting a control signal having the comparison signal inverted to the plurality of balancing circuits to thereby turn on or off the balancing switch.

Description

{APPARATUS FOR BLANCING BATTERY}

The present invention relates to an apparatus for balancing the voltage of a battery that can be used in an apparatus using electrical energy. Specifically, the present invention relates to a technique for balancing the voltage between a plurality of battery cells of a high voltage battery used in a hybrid vehicle, a plug-in hybrid vehicle and an electric vehicle.

In recent years, various devices such as industrial devices, home appliances and automobiles using high-voltage batteries have appeared, and especially in the field of automobile technology, the use of high-voltage batteries is becoming more active.

Automobiles that use internal combustion engines that use fossil fuels such as gasoline or heavy oil as the main fuel have a serious impact on pollution such as air pollution. Therefore, in recent years, efforts have been made to develop an electric vehicle or a hybrid vehicle in order to reduce pollution.

Electric vehicles (EVs) are cars that do not use petroleum fuels and engines but that use electric batteries and electric motors. In other words, although an electric vehicle that drives a car by rotating an electric motor that is stored in a battery has been developed before a gasoline car, it has not been put into practical use due to problems such as a heavy weight of a battery and a time required for charging. Recently, And research for commercialization began in the 1990s.

On the other hand, hybrid technology (HEV) that uses electric vehicles, fossil fuels and electric energy adaptively is being commercialized as battery technology has been developed remarkably.

Since HEV uses both gasoline and electricity as power sources, it is receiving positive reviews in terms of fuel efficiency improvement and emission reduction. It is expected that HEV will play an intermediate role in evolving into a full electric vehicle because it is important to overcome the price difference with gasoline automobile by reducing the amount of secondary battery to one third of that of electric cars.

Since HEV and EV vehicles using such electric energy use a battery in which a plurality of rechargeable secondary cells are packed as a main power source, there is no exhaust gas and noise is small. have.

Since the performance of a battery using the electric energy directly affects the performance of the vehicle, it is necessary to measure the voltage of each battery cell, the voltage and current of the entire battery, and to efficiently manage charge and discharge of each battery cell However, there is a need for a battery management system (BMS) that monitors the state of a cell sensing IC that senses each battery cell to enable stable control of the corresponding cell.

Meanwhile, if any one of the plurality of cells of the battery reaches the threshold value during the charging process of the battery, the charging is stopped irrespective of the charging state of the other cells. In order to prevent such a situation, it is required to discharge a specific battery cell through a cell balancing function.

However, in order to balance the voltage between the battery cells, it is necessary to measure the voltage of the battery cells. Therefore, in order to measure the voltage of the battery cells, a precise element such as a sensing IC is required. In this case, the battery balancing speed may be slowed down.

Also, in the conventional battery balancing apparatus, when a plurality of battery cells among the battery cells reach a threshold value, the voltage of all the battery cells reaching the threshold value is simultaneously discharged, so that the temperature of the battery management system may rise rapidly. As a result, there is a risk of safety hazards such as vehicle fire or explosion.

U.S. Patent Application Publication No. 2014-0070772

An object of the present invention is to provide a battery balancing device that automatically balances voltage between battery cells without a separate device for measuring the voltage of the battery cell.

A battery balancing apparatus according to an embodiment of the present invention balances a voltage between a plurality of battery cells connected in series, the battery balancing apparatus comprising a balancing resistor and a balancing switch connected in series, A plurality of balancing circuits for balancing a voltage between the plurality of battery cells; A plurality of distribution resistors connected in series to each output a cumulative average voltage obtained by successively accumulating average voltages of the plurality of battery cells; A cumulative cell voltage obtained by sequentially accumulating the voltages of the plurality of battery cells output from each of the plurality of battery cells and the cumulative mean voltage output from each of the plurality of distribution resistors, A plurality of comparators for comparing voltages and outputting comparison signals, respectively; And a plurality of logic circuits for receiving the comparison signal output from the plurality of comparators, respectively, and outputting a control signal inverted from the comparison signal to the plurality of balancing circuits to turn on or off the balancing switch.

In one embodiment, the resistance values of each of the plurality of distribution resistors are equal to each other.

In one embodiment, each of the plurality of comparators outputs a signal for turning on the balancing switch when the cumulative cell voltage is greater than the cumulative average voltage.

In one embodiment, each of the plurality of comparators outputs a signal for turning off the balancing switch when the cumulative cell voltage is smaller than the accumulated average voltage.

In one embodiment, the plurality of comparators is N-1 when the plurality of battery cells is N in number.

In one embodiment, when the Nth battery cell among the plurality of battery cells is the highest battery cell, the Nth battery cell is directly connected to the plurality of balancing circuits.

In one embodiment, the plurality of logic circuits is characterized by having N-1, where N is the number of battery cells.

In one embodiment, when the first battery cell among the plurality of battery cells is the lowest battery cell, a comparison signal output from the comparator connected to the first battery cell is directly input to the plurality of balancing circuits.

In one embodiment, the plurality of battery cells includes at least four first battery cells, a second battery cell, an N-1 battery cell, and an Nth battery cell connected in series, A first balancing circuit connected in parallel with the first battery cell, a second balancing circuit connected in parallel with the second battery cell, an N-1 balancing circuit connected in parallel with the N-1 battery cell, And an N-balancing circuit connected in parallel with the first and second capacitors, wherein the plurality of distribution resistors include a first distribution resistor, a second distribution resistor, an N-1 distribution resistor and an N-th distribution resistor connected in series.

In one embodiment, the plurality of comparators may receive a first cumulative cell voltage output from the first battery cell and a first cumulative average voltage output from the first distribution resistor to output a first comparison signal, A second comparator that receives a second cumulative cell voltage output from the second battery cell and a second cumulative average voltage output from the second distribution resistor and outputs a second comparison signal, And an N-1 comparator for receiving an (N-1) cumulative cell voltage output from the (N-1) th distribution resistor and an (N-1) .

In one embodiment, the plurality of logic circuits receives the first comparison signal and the second comparison signal and outputs a first control signal, which inverts the second comparison signal, to the second balancing circuit, A first logic circuit for turning on or off the balancing switch included in the balancing circuit, an (N-1) th comparison circuit for receiving the (N-1) th comparison signal and the (N-1) And an N-2 logic circuit for outputting the N-1 comparison signal to the N-1 balancing circuit and turning on or off the balancing switch included in the N-1 balancing circuit, And an (N-1) logic circuit for outputting an (N-1) th control signal by inverting a signal to the N-balancing circuit to turn on or off a balancing switch included in the N-balancing circuit.

In one embodiment, when the Nth battery cell among the plurality of battery cells is the highest battery cell, the Nth battery cell is directly connected to the Nth balancing circuit.

In one embodiment, when the first battery cell among the plurality of battery cells is the lowest battery cell, the first comparison signal output from the first comparator is directly input to the first balancing circuit.

In one embodiment, the first cumulative cell voltage is calculated as the first battery cell voltage, the second cumulative cell voltage is calculated by adding the first battery cell voltage and the second battery cell voltage, And the N-1 cumulative cell voltage is calculated by adding both the first battery cell to the (N-1) th battery cell voltage.

In one embodiment, the first cumulative average voltage is calculated as an average voltage of the first battery cell to the Nth battery cell, the second cumulative average voltage is calculated by accumulating the average voltage twice, And the (N-1) cumulative average voltage is calculated by accumulating the average voltage N-1 times.

In one embodiment, the first logic circuit includes an inverter for inverting the first comparison signal and an AND gate for receiving and inverting the first comparison signal inverted through the inverter and the second comparison signal .

In one embodiment, the (N-2) logic circuit receives the N-2 comparison signal and the (N-1) comparison signal inverted by the inverter and inverting the (N-2) And a logical product gate which is logically multiplied.

In one embodiment, the (N-1) -th logic circuit includes an inverter for inverting the (N-1) th comparison signal.

The present invention has the effect of automatically balancing the voltage of a plurality of battery cells by comparing a cumulative cell voltage obtained by accumulating the voltage of the battery cell and an accumulated cumulative average voltage obtained by averaging the voltages of the plurality of battery cells.

Accordingly, the present invention has an effect of performing battery balancing without a device such as a sensing IC for precisely measuring the voltage of a plurality of battery cells.

In addition, the present invention has the effect of prohibiting balancing of battery cells other than the specific battery cell when balancing a specific battery cell among a plurality of battery cells by adding a plurality of logic circuits.

Accordingly, it is possible to prevent the temperature of the battery management system from rising sharply, thereby reducing the risk of a safety accident such as fire or explosion of a vehicle.

1 is a configuration diagram of a battery balancing apparatus according to an embodiment of the present invention.
2 is a configuration diagram of a logic circuit which is an embodiment of a battery balancing apparatus according to an embodiment of the present invention.
3 is an explanatory view illustrating a process of balancing a battery in a battery balancing apparatus according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In describing the embodiments, descriptions of techniques which are well known in the technical field to which the present invention belongs and which are not directly related to the present invention are not described. This is for the sake of clarity of the present invention without omitting the unnecessary explanation.

For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated. Also, the size of each component does not entirely reflect the actual size. In the drawings, the same or corresponding components are denoted by the same reference numerals.

Hereinafter, a battery balancing apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.

1 is a configuration diagram of a battery balancing apparatus according to an embodiment of the present invention.

In FIG. 1, seven battery cells are connected in series. However, the number of battery cells may be larger or smaller than the number of battery cells shown in FIG. 1, and is not limited to the number of battery cells shown in FIG. Also, the number of configurations of the battery balancing device according to an embodiment of the present invention may be changed depending on the number of battery cells.

Hereinafter, for convenience of explanation, the number of battery cells and the number of each configuration of the battery balancing device according to one embodiment of the present invention will be described with reference to the number shown in FIG.

1, a battery balancing apparatus according to an embodiment of the present invention includes a plurality of balancing circuits B1, B2, B3, B4, B5, B6, B7, a plurality of distribution resistors Ra, Rb, Rc, Rd A plurality of comparators OP1, OP2, OP3, OP4, OP5 and OP6 and a plurality of logic circuits L1, L2, L3, L4, L5 and L6.

The plurality of balancing circuits B1, B2, B3, B4, B5, B6, B7 balances the voltage between the plurality of battery cells C1, C2, C3, C4, C5, C6, C7. The plurality of distribution resistors Ra, Rb, Rc, Rd, Re, Rf, and Rg output cumulative average voltages. The plurality of comparators OP1, OP2, OP3, OP4, OP5, and OP6 compare the cumulative cell voltage with the cumulative average voltage to output a comparison signal, respectively. The plurality of logic circuits L1, L2, L3, L4, L5, and L6 turn on or off the balancing switches SW1, SW2, SW3, SW4, SW5, SW6,

Hereinafter, each configuration of the battery balancing apparatus according to an embodiment of the present invention will be described in detail.

The plurality of balancing circuits B1, B2, B3, B4, B5, B6 and B7 are connected in series with the balancing resistors R1, R2, R3, R4, R5, R6, R7 and balancing switches SW1, SW2, SW3, SW4 , SW5, SW6, and SW7, respectively. For example, the first balancing circuit B1 includes a first balancing resistor R1 and a first balancing switch SW1 connected in series, and the remaining balancing circuits each include a balancing resistor and a balancing switch.

The plurality of balancing circuits B1, B2, B3, B4, B5, B6 and B7 are connected in parallel to each of the plurality of battery cells C1, C2, C3, C4, C5, C6 and C7. For example, the first balancing circuit B1 is connected to the first battery cell C1 in parallel, and the remaining balancing circuit is connected to the remaining battery cells in parallel.

The plurality of balancing circuits B1, B2, B3, B4, B5, B6, B7 balances the voltage between the plurality of battery cells C1, C2, C3, C4, C5, C6, C7. For example, when the voltage of the first battery cell C1 is larger than the average voltage of the plurality of battery cells C1, C2, C3, C4, C5, C6, and C7, The balancing switch SW1 is turned on to discharge the voltage of the first battery cell C1 through a path connecting the first balancing line BL1 and the second balancing line BL2. As a result, the voltage of the first battery cell C1 is reduced and the voltage balancing is performed between the plurality of battery cells C1, C2, C3, C4, C5, C6, and C7.

Although only the first balancing line BL1 and the second balancing line BL2 are illustrated in FIG. 1 for convenience of description, in the battery balancing device of the present invention, the third balancing line To 7 < th > balancing lines.

Each of the plurality of distribution resistors Ra, Rb, Rc, Rd, Re, Rf, and Rg is connected in series with each other. Specifically, when the first distribution resistance Ra is the lowest distribution resistance and the seventh distribution resistance Rg is the highest distribution resistance, the first distribution resistance Ra to the seventh distribution resistance Rg are sequentially connected in series do.

The plurality of distribution resistors Ra, Rb, Rc, Rd, Re, Rf and Rg connected in series are connected in parallel with all of the plurality of battery cells C1, C2, C3, C4, C5, C6 and C7 . Specifically, one end of the first distribution resistor Ra is connected to the negative (-) of the first battery cell C1, and the other end of the first distribution resistor Ra is connected to one end of the second distribution resistor Rb do. One end of the seventh distribution resistor Rg is connected to the other end of the sixth distribution resistor Rf and the other end of the seventh distribution resistor Rg is connected to the positive electrode of the seventh battery cell C7 .

The plurality of distribution resistors Ra, Rb, Rc, Rd, Re, Rf and Rg are obtained by accumulating average voltages of the plurality of battery cells C1, C2, C3, C4, C5, C6, Respectively. At this time, the resistance values of the plurality of distribution resistors Ra, Rb, Rc, Rd, Re, Rf, and Rg are equal to each other. Therefore, the cumulative average voltage output from each of the plurality of distribution resistors Ra, Rb, Rc, Rd, Re, Rf, and Rg is the average of the plurality of battery cells C1, C2, C3, C4, C5, C6, It becomes a multiple of the voltage.

 For example, when the average voltage of the plurality of battery cells C1, C2, C3, C4, C5, C6, and C7 is 4.1 V, the first distribution resistance Ra outputs a cumulative average voltage of 4.1 V, The second distribution resistor Rb outputs a cumulative average voltage of 8.2V. That is, the Nth distribution resistor outputs a cumulative average voltage of 4.1 x N V.

The plurality of comparators OP1, OP2, OP3, OP4, OP5, and OP6 may be configured to compare the cumulative cell voltage obtained by sequentially accumulating the voltages of the plurality of battery cells C1, C2, C3, C4, C5, C6, The voltage is input.

For example, when the voltage of the first battery cell C1 is 4.7 V and the voltages of the second battery cell C2 to the seventh battery cell C7 are all 4 V, The second comparator OP2 receives the cumulative cell voltage of 8.7 V from the second battery cell C2 and the third comparator OP3 receives the cumulative cell voltage of 4.7 V from the first battery cell C1, The fourth comparator OP4 receives the cumulative cell voltage of 16.7 V from the fourth battery cell C4 and the fifth comparator OP5 receives the cumulative cell voltage of 12.7 V from the third battery cell C3, 5 receives a cumulative cell voltage of 20.7 V from the battery cell C5 and the sixth comparator OP6 receives a cumulative cell voltage of 24.7 V from the sixth battery cell C6.

The first comparator OP1 receives the cumulative average voltage of 4.1 V from the first distribution resistor Ra and the second comparator OP2 receives the cumulative average voltage of 8.2 V from the second distribution resistor Rb The third comparator OP3 receives the cumulative average voltage of 12.3 V from the third distribution resistor Rc and the fourth comparator OP4 receives the cumulative average voltage of 16.4 V from the fourth distribution resistor Rd The fifth comparator OP5 receives the cumulative average voltage of 20.5 V from the fifth distribution resistor Re and the sixth comparator OP6 receives the cumulative average voltage of 24.6 V from the sixth distribution resistor Rf Receive.

On the other hand, since the cumulative cell voltage output from the seventh battery cell C7 and the cumulative mean voltage output from the seventh distribution resistor Rg are the same value, a comparator for comparing them is not necessary. Therefore, the seventh battery cell C7 is directly connected to the seventh balancing circuit B7.

The plurality of comparators OP1, OP2, OP3, OP4, OP5, and OP6 compare the cumulative cell voltage with the cumulative average voltage to output a comparison signal. More specifically, each of the plurality of comparators OP1, OP2, OP3, OP4, OP5, and OP6 has the balancing switches SW1, SW2, SW3, SW4, SW5, SW6, SW7 Quot; on "). The balancing switches SW1, SW2, SW3, SW4, SW5, SW6, and SW7 are respectively connected to the plurality of comparators OP1, OP2, OP3, OP4, Off signal.

For example, when the first comparator OP1 receives a cumulative cell voltage of 4.7 V from the first battery cell C1 and receives a cumulative average voltage of 4.1 V from the first distribution resistor Ra, Since the cell voltage is greater than the accumulated average voltage, the first comparator OP1 outputs a signal to turn on the first balancing switch SW1.

However, when the first comparator OP1 receives the cumulative cell voltage of 4 V from the first battery cell C1 and receives the cumulative average voltage of 4.1 V from the first distribution resistor Ra, Is smaller than the cumulative mean voltage, the first comparator OP1 outputs a signal for turning off the first balancing switch SW1.

On the other hand, when a signal for turning on the balancing switch is outputted from the specific comparator, the upper comparator of the specific comparator also outputs a signal for turning on the balancing switch. For example, when the voltage of the first battery cell C1 is 4.7 V and the voltages of the second battery cell C2 to the seventh battery cell C7 are all 4 V, 6 The comparator OP6 outputs a signal to turn on all the balancing switches SW1, SW2, SW3, SW4, SW5, SW6, and SW7.

If such a situation is neglected, there is a risk that a fire accident such as a vehicle fire or an explosion may occur due to an abrupt temperature rise of the battery management system. Therefore, there is a need to prohibit balancing of the remaining battery cells when balancing a particular battery cell.

The plurality of logic circuits L1, L2, L3, L4, L5 and L6 receive the comparison signal output from each of the plurality of comparators OP1, OP2, OP3, OP4, OP5 and OP6, The balancing switches SW1, SW2, SW3, SW4, SW5, SW6, and SW7 are turned on or off by outputting control signals to the plurality of balancing circuits B1, B2, B3, B4, B5, B6 and B7, respectively.

Specifically, the first logic circuit (L1) receives the first comparison signal output from the first comparator (OP1) and the second comparison signal output from the second comparator (OP2), and inverts the second comparison signal 1 control signal to the second balancing circuit B2 to turn on or off the second balancing switch SW2.

The second logic circuit L2 receives the second comparison signal output from the second comparator OP2 and the third comparison signal output from the third comparator OP3 and outputs the second control signal To the third balancing circuit B3 and turns on or off the third balancing switch SW3.

The third logic circuit L3 receives the third comparison signal output from the third comparator OP3 and the fourth comparison signal output from the fourth comparator OP4 and outputs the third control signal To the fourth balancing circuit B4 and turns on or off the fourth balancing switch SW4.

The fourth logic circuit L4 receives the fourth comparison signal output from the fourth comparator OP4 and the fifth comparison signal output from the fifth comparator OP5 and outputs a fourth control signal To the fifth balancing circuit B5 to turn on or off the fifth balancing switch SW5.

The fifth logic circuit L5 receives the fifth comparison signal output from the fifth comparator OP5 and the sixth comparison signal output from the sixth comparator OP6 and outputs a fifth control signal To the sixth balancing circuit B6 to turn on or off the sixth balancing switch SW6.

The sixth logic circuit L6 receives the sixth comparison signal outputted from the sixth comparator OP6 and outputs the sixth control signal inverted from the sixth comparison signal to the seventh balancing circuit B7, 7 Turn balancing switch (SW7) ON or OFF.

2 is a configuration diagram of a logic circuit which is an embodiment of a battery balancing apparatus according to an embodiment of the present invention.

Fig. 2 shows an example of the configuration of the first logic circuit L1 among the plurality of logic circuits L1, L2, L3, L4, L5, and L6. That is, the first logic circuit (L1) receives the first comparison signal and the second comparison signal inverted through the first inverter (L11) and the first inverter (L11) for inverting the first comparison signal, And a logical product gate L12 to be multiplied.

Therefore, the output of the first logic circuit (L1) outputs the logic 1 signal only when the logic 1 signal is input in the second comparison signal regardless of the input of the first comparison signal. The logic 1 signal is a signal that turns on the balancing switches SW1, SW2, SW3, SW4, SW5, SW6, and SW7 , SW6, and SW7).

Although the configuration of the first logic circuit L1 among the plurality of logic circuits L1, L2, L3, L4, L5 and L6 is shown as an example in FIG. 2, the second logic circuit L2 to the fifth logic circuit L5). However, the sixth logic circuit L6 includes only an inverter for inverting the sixth comparison signal.

The outputs of the plurality of comparators OP1, OP2, OP3, OP4, OP5 and OP6 are connected to the plurality of balancing circuits B1, B2, B3 via the plurality of logic circuits L1, L2, L3, L4, L5, , B4, B5, B6 and B7 to output a signal for turning on the balancing switch in the specific comparator among the plurality of comparators OP1, OP2, OP3, OP4, OP5 and OP6 as described above, The upper comparator of the comparator can also prevent the problem of outputting a signal to turn on the balancing switch.

3 is an explanatory view illustrating a process of balancing a battery in a battery balancing apparatus according to an embodiment of the present invention.

Referring to FIG. 3, the process of performing battery balancing in the battery balancing apparatus according to an embodiment of the present invention can be confirmed in a comprehensive manner.

That is, when the voltage of the first battery cell C1 is 4.7 V and the voltages of the second battery cell C2 to the seventh battery cell C7 are all 4 V as shown in FIG. 3, The operational amplifier OP1 receives a cumulative cell voltage of 4.7 V and a cumulative average voltage of 4.1 V, and outputs a signal to turn on the first balancing switch SW1, thereby confirming that the first balancing switch SW1 is turned on .

In this case, since the voltage balancing of the first battery cell C1 is performed, the voltage balancing of the second battery cell C2 through the seventh battery cell C7 should be prohibited. 3, the second comparator OP2 to the sixth comparator OP6 output a signal for turning on the balancing switch, but the plurality of logic circuits L1, L2, L3, L4, L5, and L6, It can be confirmed that the second balancing switch SW2 to the seventh balancing switch SW7 are maintained in the off state.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all changes or modifications derived from the meaning and scope of the claims and the equivalents thereof are included in the scope of the present specification Should be interpreted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is not intended to limit the scope. It is to be understood by those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

C1, C2, C3, C4, C5, C6, C7:
B1, B2, B3, B4, B5, B6, B7: Balancing circuit
Ra, Rb, Rc, Rd, Re, Rf, Rg: Distribution resistance
OP1, OP2, OP3, OP4, OP5, OP6: comparator
L1, L2, L3, L4, L5, L6: Logic circuit

Claims (18)

A battery balancing apparatus for balancing a voltage between a plurality of battery cells connected in series,
A plurality of balancing circuits each including a balancing resistor and a balancing switch connected in series, the balancing circuits being connected in parallel to each of the plurality of battery cells to balance a voltage between the plurality of battery cells;
A plurality of distribution resistors connected in series to each output a cumulative average voltage obtained by successively accumulating average voltages of the plurality of battery cells;
A cumulative cell voltage obtained by sequentially accumulating the voltages of the plurality of battery cells output from each of the plurality of battery cells and the cumulative mean voltage output from each of the plurality of distribution resistors, A plurality of comparators for comparing voltages and outputting comparison signals, respectively; And
And a plurality of logic circuits for receiving a comparison signal output from each of the plurality of comparators and outputting a control signal inverted from the comparison signal to the plurality of balancing circuits to turn on or off the balancing switch, . The method according to claim 1,
Wherein the resistance values of each of the plurality of distribution resistors are equal to each other. The method according to claim 1,
Wherein each of the plurality of comparators outputs a signal for turning on the balancing switch when the cumulative cell voltage is greater than the cumulative average voltage. The method according to claim 1,
Wherein each of the plurality of comparators outputs a signal for turning off the balancing switch when the cumulative cell voltage is less than the cumulative average voltage. The method according to claim 1,
Wherein the plurality of comparators are N-1 when the plurality of battery cells are N. 6. The method of claim 5,
Wherein when the Nth battery cell among the plurality of battery cells is the highest battery cell, the Nth battery cell is directly connected to the plurality of balancing circuits. The method according to claim 1,
Wherein said plurality of logic circuits are N-I if said plurality of battery cells are N. < Desc / Clms Page number 20 > 8. The method of claim 7,
Wherein the comparison signal output from the comparator connected to the first battery cell is directly input to the plurality of balancing circuits when the first battery cell among the plurality of battery cells is the lowest battery cell. The method according to claim 1,
Wherein the plurality of battery cells include at least four first battery cells, a second battery cell, an N-1 battery cell and an Nth battery cell connected in series,
The plurality of balancing circuits include a first balancing circuit connected in parallel with the first battery cell, a second balancing circuit connected in parallel with the second battery cell, an N-1 balancing circuit connected in parallel with the N-1 battery cell, And an N-balancing circuit connected in parallel with the Nth battery cell,
Wherein the plurality of distribution resistors comprises a first distribution resistor, a second distribution resistor, an N-1 distribution resistor and an Nth distribution resistor connected in series. 10. The method of claim 9,
Wherein the plurality of comparators include a first comparator that receives a first cumulative cell voltage output from the first battery cell and a first cumulative average voltage output from the first distribution resistor and outputs a first comparison signal, A second comparator for receiving a second cumulative cell voltage output from the cell and a second cumulative average voltage output from the second distribution resistor and outputting a second comparison signal; And an N-1 comparator receiving the N-1 cumulative cell voltage and the (N-1) cumulative average voltage output from the (N-1) th distribution resistor and outputting an (N-1) th comparison signal. 11. The method of claim 10,
Wherein the plurality of logic circuits receive the first comparison signal and the second comparison signal and output a first control signal that inverts the second comparison signal to the second balancing circuit, 1) -th control signal obtained by inverting the (N-1) th comparison signal by receiving the (N-1) th comparison signal and the (N-1) And an N-2 logic circuit for outputting the N-1 comparison signal to the N-1 balancing circuit and turning on or off the balancing switch included in the N-1 balancing circuit, -1 > control signal to the N-balancing circuit to turn on or off the balancing switch included in the N-balancing circuit. 12. The method of claim 11,
When the Nth battery cell among the plurality of battery cells is the highest battery cell,
And the Nth battery cell is directly connected to the N balancing circuit. 12. The method of claim 11,
Wherein when the first battery cell among the plurality of battery cells is the lowest battery cell, the first comparison signal output from the first comparator is directly input to the first balancing circuit. 12. The method of claim 11,
Wherein the first accumulated cell voltage is calculated as the first battery cell voltage,
Wherein the second cumulative cell voltage is calculated by adding the first battery cell voltage and the second battery cell voltage,
And the (N-1) cumulative cell voltage is calculated by adding all of the first battery cell to the (N-1) th battery cell voltage. 12. The method of claim 11,
Wherein the first cumulative average voltage is calculated as an average voltage of the first battery cell to the Nth battery cell,
Wherein the second cumulative average voltage is calculated by accumulating the average voltage twice,
And the N-1 cumulative mean voltage is calculated by accumulating the average voltage N-1 times. 12. The method of claim 11,
Wherein the first logic circuit includes an inverter for inverting the first comparison signal and an AND gate for receiving the first comparison signal inverted through the inverter and the second comparison signal to logically multiply the first comparison signal and the second comparison signal. Device. 12. The method of claim 11,
Wherein the N-2 logic circuit comprises: an inverter for inverting the N-2 comparison signal; and an AND gate for receiving the N-2 comparison signal inverted through the inverter and the N-1 comparison signal, Wherein the battery balancing device is a battery balancing device. 12. The method of claim 11,
And the N-1 logic circuit includes an inverter for inverting the (N-1) th comparison signal.

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