KR102096132B1 - Apparatus and Method for balancing of battery cell - Google Patents

Abstract

The present invention relates to a battery cell balancing apparatus and method, and more specifically, based on the power ratio of the power consumption and the target power consumption of the balancing resistor, the discharge rate during the balancing cycle is determined, and the battery corresponding to the determined discharge rate It relates to a battery cell balancing device and method for controlling the connection of the cell and the balancing resistor.

Description

Apparatus and method for balancing of battery cell

The present invention relates to a battery cell balancing apparatus and method, and more specifically, based on the power ratio of the power consumption and the target power consumption of the balancing resistor, the discharge rate during the balancing cycle is determined, and the battery corresponding to the determined discharge rate It relates to a battery cell balancing device and method for controlling the connection of the cell and the balancing resistor.

Recently, due to exhaustion of fossil energy and environmental pollution due to the use of fossil energy, interest in electric products that can be driven using a secondary battery has increased. Accordingly, technology development for mobile devices, electric vehicles (EVs), hybrid vehicles (HVs), energy storage systems (ESSs), and uninterruptible power supplies (UPS), etc. As demand and demand increase, the demand for a secondary battery battery as an energy source is rapidly increasing.

These secondary battery batteries have attracted attention as a new energy source for eco-friendliness and energy efficiency enhancement, in that they not only generate by-products due to the use of energy, as well as a primary advantage that can dramatically reduce the use of fossil energy.

In particular, secondary battery batteries used in electric vehicles, hybrid vehicles, energy storage systems, and uninterruptible power supplies are configured by connecting multiple battery cells to charge or discharge high-power and large-capacity power. As such, the battery cells of the secondary battery should ideally have the same characteristics, but the variation in capacity, impedance and internal resistance, and the above-described variation increases as charging and discharging of the secondary battery is performed. Due to the variation between the battery cells, a specific battery cell is overcharged or overdischarged, thereby shortening the life of the battery cell, and further shortening the life of the secondary battery.

Accordingly, in order to improve the stability and life of the battery cell, a balancing technique that maintains a uniform voltage between the battery cells is applied to the secondary battery. More specifically, in the method of uniformly balancing the voltage of each battery cell included in the secondary battery, active balancing, in which the voltage is increased by supplying a charging current to a battery cell having a relatively low voltage, the voltage is relatively As a result, there is passive balancing, which causes the voltage to drop by discharging a high battery cell.

In particular, in order to implement passive balancing technology, a secondary battery has a balancing resistor that consumes power of a battery cell, a switching element that controls the energization between the battery cell and the balancing resistor, and a switching element on or off according to the voltage of the battery cell. It is provided with a control unit for controlling the.

When the passive balancing technology is implemented, power of the secondary battery is discharged through the balancing resistor, and a charging voltage of the secondary battery is applied to the balancing resistor to generate heat. The control unit performs the balancing of the secondary battery by controlling the connection between the secondary battery and the balancing resistor so as not to exceed the limit temperature in response to the deterioration characteristics of each balancing resistor.

At this time, in the conventional passive balancing technology, the balancing is performed by controlling the switching element so that the temperature of the balancing resistor does not exceed only the limit temperature, so that the temperature of the balancing resistor constantly approaches the limit temperature during balancing.

Accordingly, the deterioration of the balancing resistor is accelerated and the power to be discharged is changed due to the loss of the balancing resistor or the resistance value of the balancing resistor, as well as the problem of heat generation in the peripheral elements and the balancing circuit due to the heat generation of the balancing resistor. have.

Accordingly, the present inventor determines the target power consumption of the balancing resistor that is connected to the battery cell and discharges the battery cell in order to solve the above problems, and based on the power ratio of the power consumption of the balancing resistor and the target power consumption By determining the discharge rate of the discharge time during which the battery cells are discharged by the balancing resistor during the balancing cycle of the, switching element for energizing or blocking the current flowing from the battery cell to the balancing resistor in response to the discharge ratio so as not to overheat the balancing resistor It relates to a battery cell balancing apparatus and method to control.

Korean Patent Publication No. 10-2014-0106982

An object of the present invention is connected to the battery cell to determine the target power consumption of the balancing resistor for discharging the battery cell, and based on the ratio of the power consumption of the power consumption and the target power of the balancing resistor to the balancing resistance during the balancing cycle of the battery cell By determining the discharge rate of the discharge time during which the battery cell is discharged, and controlling the switching element that energizes or cuts the current flowing from the battery cell to the balancing resistor in response to the discharge rate, the temperature of the balancing resistance due to the balancing of the battery cell It is to provide a battery cell balancing device and method that can prevent the phenomenon of overheating and burnout.

The battery cell balancing apparatus according to the present invention includes: a power determining unit connected to a battery cell to determine a target power consumption of a balancing resistor for discharging the battery cell; A discharge rate determination unit determining a discharge rate of a discharge time during which the battery cell is discharged by the balancing resistor during a balancing period of the battery cell based on a power ratio of the power consumption of the balancing resistor and the target power consumption; And a control unit that controls a switching element that energizes or blocks the current flowing from the battery cell to the balancing resistor in response to the discharge rate.

In one embodiment, the battery cell balancing device calculates power to calculate power consumption of the balancing resistor by using at least one of a charging voltage value of the battery cell, a resistance value of the balancing resistor, and a voltage value across both ends of the balancing resistor. Wealth; may further include.

In one embodiment, the power determining unit may determine the target power consumption based on the deterioration information of the balancing resistor.

In one embodiment, the power determining unit may determine the target power consumption based on a temperature change according to the power consumption of the balancing resistor.

In one embodiment, the discharge rate determining unit may determine the discharge rate using the following equation.

<Mathematics>

Here, Rd is the discharge ratio, Rp is the power ratio, Pt is the target power consumption, and Pd is the power consumption.

In one embodiment, the controller calculates the discharge time using the discharge rate, and controls the switching element to be ON during the discharge time to connect the battery cell and the balancing resistor to discharge the battery cell. have.

In one embodiment, the controller may calculate the discharge time using the following equation.

<Mathematics>

Here, Td is the discharge time, Tb is the balancing cycle, Rd is the discharge ratio, Pt is the target power consumption, Pd is the power consumption.

The battery cell balancing method according to the present invention comprises the steps of: determining a target power consumption of a balancing resistor for discharging the battery cell by being connected to a battery cell; A discharge rate determining unit determining a discharge rate of a discharge time during which the battery cell is discharged by the balancing resistor during a balancing cycle of the battery cell based on a power ratio of the power consumption of the balancing resistor and the target power consumption; And a control unit controlling a switching element that energizes or blocks the current flowing from the battery cell to the balancing resistor in response to the discharge rate.

In one embodiment, the battery cell balancing method calculates power consumption of the balancing resistor by using one or more of a charging voltage value of the battery cell, a resistance value of the balancing resistor, and a voltage value across both ends of the balancing resistor. It may further include the step of.

In one embodiment, the step of determining the target power consumption may include the step of determining the target power consumption by the power determination unit based on the deterioration information of the balancing resistor.

In one embodiment, the step of determining the target power consumption may further include the step of determining the target power consumption based on the temperature change according to the power consumption of the balancing resistor.

In one embodiment, the step of determining the discharge rate may include the step of determining the discharge rate by the discharge rate determination unit using the following equation.

<Mathematics>

Here, Rd is the discharge ratio, Rp is the power ratio, Pt is the target power consumption, and Pd is the power consumption.

In one embodiment, the step of controlling the switching element, the control unit calculates the discharge time using the discharge rate, and controls the switching element to ON during the discharge time to connect the battery cell and the balancing resistor And discharging the battery cells.

In one embodiment, the step of controlling the switching element may further include; the control unit calculating the discharge time using the following equation.

<Mathematics>

Here, Td is the discharge time, Tb is the balancing cycle, Rd is the discharge ratio, Pt is the target power consumption, Pd is the power consumption.

Battery cell balancing apparatus and method according to the present invention is connected to the battery cell to determine the target power consumption of the balancing resistor for discharging the battery cell, and balancing the battery cell based on the power ratio of the power consumption and the target power consumption of the balancing resistor During the cycle, the discharge rate of the discharge time during which the battery cells are discharged by the balancing resistor is determined, and by controlling the switching element that energizes or cuts the current flowing from the battery cell to the balancing resistor in response to the discharge ratio, the battery cell is balanced. Due to this, there is an effect of preventing the phenomenon of burnout due to overheating of the balancing resistor.

1 is a view schematically showing an electric vehicle to which a battery cell balancing device according to an embodiment of the present invention can be applied.
2 is a block diagram showing the configuration of a battery cell balancing device according to an embodiment of the present invention.
3 is a diagram showing an example of a specific configuration of a battery cell balancing device according to an embodiment of the present invention.
4 is a graph showing a balancing cycle and a discharge time of a battery cell balancing device according to an embodiment of the present invention.
5 is a flowchart illustrating a method for estimating a balancing resistance value of a battery cell according to an embodiment of the present invention.

If described in detail with reference to the accompanying drawings the present invention. Here, repeated descriptions, well-known functions that may unnecessarily obscure the subject matter of the present invention, and detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for a more clear description.

Throughout the specification, when a part “includes” a certain component, it means that the component may further include other components, not to exclude other components, unless otherwise stated.

Also, the term “part” described in the specification means a unit that processes one or more functions or operations, and may be implemented by hardware or software or a combination of hardware and software.

1 is a view schematically showing an electric vehicle to which a battery cell balancing device according to an embodiment of the present invention can be applied.

1 illustrates an example in which a battery cell balancing device according to an embodiment of the present invention is applied to an electric vehicle, the battery cell balancing device according to an embodiment of the present invention includes a mobile device, an energy storage system, or uninterrupted power in addition to an electric vehicle. Any technical field can be applied as long as a secondary battery such as a power supply can be applied.

The electric vehicle 1 may include a battery 10, a battery management system (BMS) 20, an electronic control unit (ECU) 30, an inverter 40, and a motor 50.

The battery 10 is an electric energy source that drives the electric vehicle 1 by providing driving force to the motor 50. The battery 10 may be charged or discharged by the inverter 40 according to driving of the motor 50 or an internal combustion engine (not shown).

Here, the type of the battery 10 is not particularly limited, and may be, for example, a lithium ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel hydrogen battery, a nickel zinc battery, or the like.

The BMS 20 estimates the state of the battery 10 and manages the battery 10 using the estimated state information. For example, the battery 10 state information such as a state of charging (SOC), a state of health (SOH), an allowable maximum input / output power, and an output voltage is estimated and managed. In addition, the charging or discharging of the battery 10 is controlled using the state information, and further, the replacement timing of the battery 10 can be estimated.

In addition, the BMS 20 may include a battery cell balancing device (100 in FIG. 2) described below. The battery cell balancing apparatus 100 determines the discharge rate during the balancing cycle based on the power ratio of the power consumption and the target power consumption of the balancing resistor for discharging the battery cells included in the battery 10, and the determined discharge rate Correspondingly, by controlling the connection between the battery cell and the balancing resistor, overheating of the balancing resistor can be prevented.

The above-described content of the battery cell balancing apparatus 100 performing the balancing of the battery cells to prevent overheating of the balancing resistor will be described in detail with reference to FIG. 2.

The ECU 30 is an electronic control device that controls the state of the electric vehicle 1. For example, the torque level is determined based on information such as an accelerator, a brake, and speed, and the output of the motor 50 is controlled to match the torque information.

In addition, the ECU 30 sends a control signal to the inverter 40 so that the battery 10 can be charged or discharged based on state information such as SOC and SOH of the battery 10 received by the BMS 20. .

The inverter 40 allows the battery 10 to be charged or discharged based on the control signal of the ECU 30.

The motor 50 uses the electric energy of the battery 10 to drive the electric vehicle 1 based on control information (eg, torque information) transmitted from the ECU 30.

2 is a block diagram showing the configuration of a battery cell balancing device according to an embodiment of the present invention, and FIG. 3 is a view showing an example of a specific configuration of a battery cell balancing device according to an embodiment of the present invention .

2 and 3, the battery cell balancing device 100 includes a balancing unit 110, a power calculating unit 120, a power determining unit 130, a power ratio calculating unit 140, and a discharge ratio calculating unit ( 150) and the control unit 160. The battery cell balancing device 100 shown in FIGS. 2 and 3 is according to an embodiment, and its components are not limited to the embodiment shown in FIGS. 2 and 3, and may be added, changed or changed as necessary. It can be deleted.

The battery cell balancing device 100 includes a battery 10 including a battery cell 11 and a remaining capacity (SOC) of the battery cell 11 based on the voltage, current, and temperature, respectively. , Calculate the remaining life (State Of Health; SOH) and the maximum allowable amount of input and output power, charging the battery cell 11 using the calculated state information (SOC, SOH and the maximum input and output power allowance) of the battery cell 11 or It may be included in a battery management system (BMS, 20) for controlling discharge.

The balancing unit 110 may serve to discharge the charging voltage of the battery cell 11 included in the battery 10 described later. To this end, the balancing unit 110 may include a switching element 111 and a balancing resistor 112.

Here, the switching element 111 may be any one of a MOS metal oxide silicon field effect transistor (FET) element, an insulated gate bipolar transistor (IGBT) element, and a bipolar junction transistor (BJT) element.

The balancing unit 110 may further include a gate resistor 113 for adjusting the gate voltage of the MOS FET element in addition to the balancing resistor 112 when the switching element 111 is a MOS FET element.

Hereinafter, the balancing unit 110 in which the switching element 111 is a MOS FET element will be described.

The switching element 111 may include a drain terminal (D), a gate terminal (G) and a source terminal (S), the drain terminal (D) and the gate terminal (G) is a balancing resistor 112 and a gate resistor, respectively It can be connected with (113).

When the gate voltage greater than or equal to the threshold voltage is applied to the gate terminal G of the switching element 111, the drain terminal D and the source terminal S are energized and the balancing resistor connected to the drain terminal D ( A current may flow in 112).

That is, when the switching element 111 is energized and the current output from the battery cell 11 flows to the balancing resistor 112, the battery cell 11 is discharged, and thereby, the charging voltage charged in the battery cell 11 The voltage value of can be reduced.

Meanwhile, the resistance value of the gate resistor 113 may be changed in order to adjust the gate voltage applied to the gate terminal G in response to the threshold voltage of the switching element 111.

When the battery cell 11 is discharged through the balancing unit 110, the power calculating unit 120 may serve to calculate power consumption of the balancing resistor 112.

More specifically, the power calculating unit 120 uses the charging voltage value of the battery cell 11, the resistance value of the balancing resistor 112, and the balancing resistor 112 by using one or more of the voltage values at both ends of the balancing resistor 112. It can calculate the power consumption.

To this end, the power calculating unit 120 stores in advance device characteristic information (for example, the voltage drop amount of the diode) of the switching element 111 included in the balancing unit 110 when the circuit of the balancing unit 110 is configured. When calculating the power consumption of the balancing resistor 112, the voltage values at both ends of the balancing resistor 112 according to the charging voltage value of the current battery cell 11 may be extracted.

Through this, the power calculator 120 may calculate the power consumption of the balancing resistor 112 when the switch element 111 is changed to ON and the battery cell 11 is discharged.

In this case, the power calculator 120 may calculate power consumption of the balancing resistor 1130 using Equation 1 below.

<Equation 1>

Here, Pd is power consumption, Vr is a voltage value at both ends of the balancing resistor, and R is a resistance value of the balancing resistor.

The power calculation unit 120 according to an embodiment of the present invention described above uses one or more of a charging voltage value of the battery cell 11, a resistance value of the balancing resistor 112, and a voltage value at both ends of the balancing resistor 112. It has been described that the power consumption of the balancing resistor 112 is calculated.

However, the power calculator according to another embodiment may calculate power consumption consumed by the balancing resistor 112 when the balancing unit 110 performs balancing of the battery cell 11 according to the circuit configuration of the balancing unit 110. Note that the method of calculating power consumption as far as possible is not limited.

For example, the power calculator according to another embodiment measures the current value of the discharge current flowing in the balancing resistor 112 and multiplies the voltage value at both ends of the balancing resistor 112 by the current value of the measured discharge current, thereby balancing the resistor 112 ) Can also be calculated.

The power determining unit 130 may be connected to the battery cell 11 and may serve to determine the target power consumption of the balancing resistor 112 that discharges the battery cell 11.

Here, the target power consumption is the power determined so that when the battery cell 11 is discharged through the balancing resistor 112, the temperature of the balancing resistor 112 is increased to a temperature at which the balancing resistor 112 is not burned out due to overheating. It can be a value.

That is, when the balancing resistor 112 discharges the battery cell 11 while consuming as much power as the target power consumption, the temperature of the balancing resistor 112 can maintain a temperature at which the balancing resistor 112 does not burn out.

The power determining unit 130 according to an embodiment of the present invention may determine the target power consumption based on the deterioration information of the balancing resistor 112. That is, the power determining unit 130 according to an embodiment may store deterioration information according to the power consumption of the balancing resistor 112 in advance and determine the target power consumption based on the deterioration information.

The power determining unit according to another embodiment may determine the target power consumption based on the temperature change according to the power consumption of the balancing resistor 112.

More specifically, the power determining unit according to another embodiment previously stores temperature changes according to power consumption as shown in Table 1 below, and targets power consumption corresponding to temperature changes that the balancing resistor 112 does not burn out due to overheating. It can be determined by power consumption.

For example, referring to Table 1, when the temperature change of the balancing resistor 112 is not burned up to 25 ° C, the power determining unit according to another embodiment consumes power corresponding to 25 ° C in the temperature change according to power consumption 0.150W can be determined as the target power consumption.

Temperature change Power Consumption + 2 ℃ 0.025 W + 5 ℃ 0.050W + 10 ℃ 0.075 W + 15 ℃ 0.100W + 20 ℃ 0.125 W + 25 ℃ 0.150 W + 40 ℃ 0.200W + 50 ℃ 0.250 W

The power ratio calculating unit 140 serves to calculate the power ratio of the power consumption of the balancing resistor 112 calculated by the power calculating unit 120 and the target power consumption of the balancing resistor 112 determined by the power determining unit 130. You can do

At this time, the power ratio calculation unit 140 receives power consumption and target power consumption directly from the power calculation unit 120 and the power determination unit 130, or reads power consumption and target power consumption stored in the storage unit to consume power. And the power ratio of the target power consumption.

In this case, the power ratio calculator 140 may calculate the power ratio using Equation 2 below.

<Equation 2>

Here, Rp is the power ratio, Pt is the target power consumption, and Pd is the power consumption.

The discharge rate determining unit 150 is based on the power rate calculated by the power rate calculating unit 140 during the balancing period of the battery cell 11, the discharge time of the battery cell 11 is discharged by the balancing resistor 112 It can serve to determine the discharge rate.

4 is a graph showing a balancing cycle and a discharge time of the battery cell balancing device 100 according to an embodiment of the present invention.

The balancing cycle described above will be described with reference to FIG. 4.

The balancing period Tb includes a balancing operation in which the control unit 160 to be described later discharges the battery cell 110 using the balancing unit 110, a charging voltage of the battery cell 110, a resistance value of the balancing resistor 112, and the like. It may be a time for performing a sensing operation measuring 1 time.

That is, the control unit 160 performs the balancing operation and the sensing operation once each during the balancing period Tb, and the balancing period Tb may be repeated. In this case, the time when the switching element 111 connected between the battery cell 11 and the balancing resistor 112 is turned on to discharge the battery cell 11 may be a discharge time Td.

When the discharge rate determination unit 150 is described again, the discharge rate determination unit 150 may determine the discharge rate so that the rate of the discharge time Td during which the battery cell 11 is discharged during the balancing period is equal to the power rate. have.

That is, the discharge rate determination unit 150 may determine the discharge rate of the discharge time Td during the balancing period so that the power consumed by the balancing resistor 112 is consumed by the target power consumption.

At this time, the discharge rate determining unit 150 may determine the discharge rate using Equation 3 below.

<Equation 3>

Here, Rd is the discharge ratio, Rp is the power ratio, Pt is the target power consumption, and Pd is the power consumption.

The controller 160 may serve to control the switching element 111 that energizes or blocks the current flowing from the battery cell 11 to the balancing resistor 112 in response to the discharge rate.

To this end, the controller 160 calculates the discharge time using the discharge rate, and controls the switching element 111 to ON during the discharge time to connect the battery cell 11 and the balancing resistor 112 to connect the battery cell 11 ) Can be discharged.

More specifically, the control unit 160 controls the operating state of the switching element 111 to On by applying a gate voltage equal to or higher than the threshold voltage of the switching element 111 during the calculated discharge time to the gate terminal G. You can.

Through this, the control unit 160 may discharge the battery cell 11 by flowing a current through the balancing resistor 112 connected to the drain terminal D of the switching element 111.

Conversely, the control unit 160 may not discharge the battery cell 11 by controlling the operating state of the switching element 111 to Off in a section in which a sensing operation is performed other than the discharge time.

At this time, the control unit 160 may be any one of a microcontroller unit (MCU) and an application specific integrated circuit (ASIC).

The controller 160 may calculate the discharge time using Equation 4 below.

<Equation 4>

Here, Td is the discharge time, Tb is the balancing cycle, Rd is the discharge rate, Pt is the target power consumption, Pd is the power consumption.

Through this, the battery cell balancing apparatus 100 according to an embodiment determines the discharge time so that the temperature of the battery cell does not continuously maintain the limit range, so that the temperature of the balancing resistor is overheated and burned out due to the balancing of the battery cell The phenomenon can be prevented.

5 is a flowchart illustrating a method for estimating a balancing resistance value of a battery cell according to an embodiment of the present invention.

Referring to FIG. 5, the power calculation unit calculates power consumption of the balancing resistor by using at least one of a charging voltage value of a battery cell, a resistance value of a balancing resistor, and a voltage value at both ends of the balancing resistor (S501). Here, the power consumption calculated from the power calculation unit may be a power value consumed in the balancing resistor when the switch element is turned on and the battery cell is discharged.

Next, the power determining unit is connected to the battery cell to determine the target power consumption of the balancing resistor for discharging the battery cell (S502). Here, the target power consumption determined from the power determining unit may be a power consumption value determined to increase the temperature of the balancing resistance to a temperature at which the balancing resistance does not burn out due to overheating when the battery cell discharges through the balancing resistor.

Subsequently, the power ratio calculating unit calculates the power ratio between the power consumption and the target power consumption (S503), and the discharge in which the battery cell is discharged by the balancing resistor during the balancing cycle of the battery cell based on the calculated power ratio in the discharge ratio determination unit The discharge rate of time is determined (S504).

That is, the discharge rate determining unit may determine the discharge rate such that the rate of the discharge time during which the battery cells are discharged during the balancing period is equal to the power rate. For example, when the power consumption of the balancing resistor and the target power consumption are 1000 W and 250 W, respectively, the power ratio is calculated as 1/4 from the power ratio calculating unit and the discharge ratio determining unit calculates the discharge ratio as 1/4.

Thereafter, the control unit calculates the discharge time during the balancing period using the discharge ratio (S505), and controls the switching element to be ON during the discharge time to connect the battery cell and the balancing resistor to discharge the battery cell (S506). Continuing with the above-described example, when the balancing period is 1000 ms, the control unit multiplies the discharge ratio determined by the discharge ratio determination unit 1/4 by the balancing period 1000 ms to calculate the discharge time 250 ms, and for the discharge time 250 ms for each 1000 ms that is the balancing time The switching element can be controlled to discharge the battery cell.

Through this, the battery cell balancing method according to an embodiment determines the discharge time so that the temperature of the battery cell does not continuously maintain the limit range, thereby preventing the temperature of the balancing resistor from being overheated and burned out due to the balancing of the battery cell can do.

Although described above with reference to preferred embodiments of the present invention, those skilled in the art variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You can understand that you can.

100: battery cell balancing device
110: balancing unit
111: switching element 112: balancing resistor
113: gate resistance
D: Drain terminal G: Gate terminal
S: Source terminal
120: power calculation unit 130: power determination unit
140: power ratio calculation unit 150: discharge ratio determination unit
160: control unit
10: battery
11: battery cell
20: Battery management system

Claims (14)

A power determination unit connected to a battery cell to determine a target power consumption of a balancing resistor that discharges the battery cell;
A discharge rate determining unit for determining a discharge rate of a discharge time during which the battery cells are discharged by the balancing resistor during a balancing cycle of the battery cells based on a power ratio of the power consumption of the balancing resistor and the target power consumption; And
It includes; a control unit for controlling a switching element for energizing or blocking the current flowing from the battery cell to the balancing resistor in response to the discharge rate;
The power determining unit,
Characterized in that the target power consumption is determined based on the deterioration information of the balancing resistor,
Battery cell balancing device.
According to claim 1,
It characterized in that it further comprises; a power calculating unit for calculating the power consumption of the balancing resistor by using at least one of the charging voltage value of the battery cell, the resistance value of the balancing resistor and the voltage value across the balancing resistor;
Battery cell balancing device.
delete According to claim 1,
The power determining unit,
Characterized in that to determine the target power consumption based on the temperature change according to the power consumption of the balancing resistor,
Battery cell balancing device.
According to claim 1,
The discharge rate determination unit,
The discharge rate is determined by using the following equation,
Battery cell balancing device.

<Mathematics>

Here, Rd is the discharge ratio, Rp is the power ratio, Pt is the target power consumption, and Pd is the power consumption.
According to claim 1,
The control unit,
The discharge time is calculated using the discharge ratio, and the switching element is controlled to be ON during the discharge time to connect the battery cell and the balancing resistor to discharge the battery cell.
Battery cell balancing device.
According to claim 1,
The control unit,
The discharge time is calculated by using the following equation,
Battery cell balancing device.

<Mathematics>

Here, Td is the discharge time, Tb is the balancing cycle, Rd is the discharge ratio, Pt is the target power consumption, Pd is the power consumption.
Determining a target power consumption of a balancing resistor connected to a battery cell and discharging the battery cell;
A discharge rate determining unit determining a discharge rate of a discharge time during which the battery cell is discharged by the balancing resistor during a balancing cycle of the battery cell based on a power ratio of the power consumption of the balancing resistor and the target power consumption; And
Including the control unit controls the switching element for energizing or blocking the current flowing from the battery cell to the balancing resistor in response to the discharge rate.
Determining the target power consumption,
It characterized in that it comprises; the power determining unit determining the target power consumption based on the deterioration information of the balancing resistor;
Battery cell balancing method.
The method of claim 8,
It characterized in that it further comprises the step of calculating the power consumption of the balancing resistor by using at least one of a charging voltage value of the battery cell, a resistance value of the balancing resistor, and a voltage value across both ends of the balancing resistor. ,
Battery cell balancing method.
delete The method of claim 8,
Determining the target power consumption,
Characterized in that it further comprises; the power determining unit determining the target power consumption based on the temperature change according to the power consumption of the balancing resistor;
Battery cell balancing method.
The method of claim 8,
The step of determining the discharge rate,
The discharge rate determining unit using the following equation to determine the discharge rate; characterized in that it comprises a,
Battery cell balancing method.

<Mathematics>

Here, Rd is the discharge ratio, Rp is the power ratio, Pt is the target power consumption, and Pd is the power consumption.
The method of claim 8,
Controlling the switching element,
The control unit calculates the discharge time using the discharge rate, and controlling the switching element to be ON during the discharge time to connect the battery cell and the balancing resistor to discharge the battery cell. Characterized by,
Battery cell balancing method.
The method of claim 8,
Controlling the switching element,
The control unit calculates the discharge time using the following equation; characterized in that it further comprises,
Battery cell balancing method.

<Mathematics>

Here, Td is the discharge time, Tb is the balancing cycle, Rd is the discharge ratio, Pt is the target power consumption, Pd is the power consumption.

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