KR20210054350A - Apparatus for Controlling Power of Parallel Multi Battery Pack and Method thereof - Google Patents

Abstract

According to the present invention, disclosed are an output control device for a parallel multi-battery pack and a method thereof. According to the present invention, a control unit determines an output value corresponding to a charging condition of first to nth battery packs. Also, the control unit receives driving speed information of an electric vehicle from a control system of the electric vehicle through a communication unit. Also, the control unit identifies an abnormal battery pack and determines an output relaxation time corresponding to a driving velocity of the vehicle by using predefined second correlation information between the driving speed of the vehicle and the output relaxation time. Also, the control unit determines an output relaxation profile of the abnormal battery pack, and determines a relaxation output value of the abnormal battery pack by referring to the output relaxation profile during the output relaxation time. Also, the control unit transmits information about a total output value determined based on the relaxation output value to a control system of the electric vehicle through the communication unit. Also, the control unit turns off a switch part included in the abnormal battery pack after the elapse of the output relaxation time. Therefore, the present invention is capable of stopping the use of an abnormal battery pack without causing a safety issue.

Description

TECHNICAL FIELD [Apparatus for Controlling Power of Parallel Multi Battery Pack and Method thereof]

The present invention relates to an output control apparatus and method, and more particularly, to an apparatus and method capable of adaptively adjusting an output of an abnormal battery pack in a parallel multi-battery pack in which a plurality of battery packs are connected in parallel.

Batteries are rapidly spreading to fields such as mobile devices such as mobile phones, laptop computers, smart phones, and smart pads, as well as electric vehicles (EV, HEV, PHEV) and large-capacity power storage devices (ESS). have.

A battery system mounted on an electric vehicle includes n battery packs connected in parallel to secure a high energy capacity, and each battery pack includes a plurality of battery cells connected in series. Hereinafter, a module in which n battery packs are connected in parallel is referred to as a parallel multi-battery pack.

In the present specification, the battery cell may include one unit cell or a plurality of unit cells connected in parallel. The unit cell includes a negative terminal and a positive terminal, and means one independent cell that can be physically separated. For example, one pouch-type lithium polymer cell may be regarded as a unit cell.

The output of the parallel multi-battery pack is determined based on the battery pack having the lowest output among the battery packs connected in parallel. That is, a value obtained by multiplying the minimum output value and the number of battery packs among the output values of the battery packs becomes the total output value of the parallel multi-battery pack.

For example, in a parallel multi-battery pack in which five battery packs are connected in parallel, if the output values of the five battery packs are 1kW, 2kW, 3kW, 4kW, and 5kW, respectively, the total output value of the parallel multi-connected battery pack is 5 *It becomes 1kW (5kW).

The management system of the parallel multi-battery pack provides information on the total output value of 5kW to the control system of the electric drive vehicle. Then, the control system is an advanced driver assistance system (ADAS: Advanced Driver Assistance System) unit such as power supplied to the inverter or DC/DC converter, lane departure prevention, and front collision warning so that the power consumed by the electric vehicle does not exceed 5kW. It adaptively distributes the power supplied to the power unit and the like. Distributing power within the range of the total output value provided to the battery management system is called a power guideline.

When the driving speed of an electric drive vehicle increases, a higher level of attitude control or braking performance is required. Accordingly, the total power value to be supplied by the battery system including the parallel multi-battery pack also increases.

Meanwhile, when a specific battery pack among n battery packs constituting a parallel multi-battery pack becomes abnormal, the use of the battery pack must be stopped.

For example, when there is a risk of electric shock due to leakage current generated from a specific battery pack, or when the temperature of a specific battery pack rises abnormally and suddenly, the battery pack is difficult to achieve normal performance, so turn the switch included in the battery pack. It is desirable to turn it off and stop using it.

However, when the use of a specific battery pack is suddenly stopped, the total output value provided by the parallel multi-battery pack changes rapidly. Such rapid fluctuations in the total output value adversely affect the power distribution policy of electric vehicles. In other words, if the total output value decreases rapidly, the speed of the vehicle suddenly decreases because the inverter output also rapidly decreases. In addition, the ADAS unit, which is directly connected to the stability of driving, can secure enough time to prepare for the change in the total output value. Can't. Accordingly, in an electric vehicle that is operated under autonomous driving conditions, a lane departure prevention function or a forward collision prevention function, etc. may not operate smoothly.

As described above, in the case of a parallel multi-battery pack, the sudden interruption of use of the battery pack may cause a serious risk to the entire control system of the electric vehicle or to the driver.

The present invention is invented under the background of the prior art as described above, and when some battery packs included in the parallel multi-battery pack are identified as abnormal battery packs, power is generated by adaptively relaxing the output value of the battery pack and then stopping use. An object of the present invention is to provide an apparatus and method for controlling the output of a parallel multi-battery pack that enables stable operation of a power distribution policy in the aspect of a system receiving the system.

The apparatus for controlling output of a parallel multi-battery pack according to the present invention for achieving the above technical problem includes first to n-th sensor units for measuring operation characteristic values for n battery packs connected in parallel to each other included in the parallel multi-battery pack. ; A communication unit forming a communication interface with the control system of the electric drive vehicle; And a control unit operatively coupled to the first to nth sensor units and the communication unit.

Preferably, the control unit determines a state of charge of each battery pack based on an operation characteristic value of each battery pack received from the first to nth sensor units, and a first predefined between the state of charge and the output value. Determines an output value corresponding to the state of charge of each battery pack using correlation information, receives driving speed information of the vehicle from the control system of the electric drive vehicle through the communication unit, and abnormal battery pack among n battery packs When identified, the output relaxation time corresponding to the driving speed of the vehicle is determined using the second predefined correlation information between the driving speed of the vehicle and the output relaxation time, and the output relaxation profile of the abnormal battery pack is determined. , During the output relaxation time, a relaxation output value of the abnormal battery pack is determined by referring to the output relaxation profile, and information on a total output value determined based on the relaxation output value is transmitted to the control system of an electric drive vehicle through the communication unit. And, after the output relaxation time has elapsed, the switch part included in the abnormal battery pack is turned off.

According to an aspect, the first correlation information may be a state of charge-output value lookup table defining an output value according to a state of charge of the battery pack.

According to another aspect, the second correlation information may be a driving speed-output relaxation time lookup table defining an output relaxation time according to a driving speed of the electric drive vehicle.

Preferably, the power relaxation time may increase in proportion to the speed of the electric vehicle.

Preferably, the output relaxation profile may be a profile that linearly decreases during the output relaxation time from a current output value of the abnormal battery pack to a preset minimum output value.

Preferably, the control unit may be configured to calculate a value obtained by multiplying a relaxation output value calculated from the output relaxation profile and the number of battery packs as a total output value while the output relaxation time elapses.

The technical problem according to the present invention can be achieved by an electric drive vehicle and a battery management system including an output control device of a parallel multi-battery pack.

The method for controlling output of a parallel multi-battery pack according to the present invention for achieving the above technical problem includes: (a) first to first for measuring operation characteristic values for n battery packs connected in parallel to each other included in the parallel multi-battery pack. n sensor unit; And providing a communication unit that forms a communication interface with a control system of the electric drive vehicle. (b) receiving an operating characteristic value of each battery pack from the first to nth sensor units; (c) determining a state of charge of each battery pack based on an operating characteristic value of each battery pack; (d) determining an output value corresponding to the state of charge of each battery pack using first predefined correlation information between the state of charge and the output; (e) receiving driving speed information of the vehicle from the control system of the electric drive vehicle through the communication unit; (f) identifying an abnormal battery pack among n battery packs and determining an output relaxation time corresponding to the driving speed of the vehicle by using second predefined correlation information between the driving speed of the vehicle and the output relaxation time; (g) determining an output relaxation profile of the abnormal battery pack, and determining a relaxation output value of the abnormal battery pack by referring to the output relaxation profile during the output relaxation time; (h) transmitting information on a total output value determined based on the relaxation output value to a control system of an electric drive vehicle through the communication unit; And (i) turning off a switch included in the abnormal battery pack after the output relaxation time has elapsed.

According to the present invention, in a situation in which some battery packs included in parallel multi-battery packs do not operate normally, an electric-powered vehicle by mitigating the output value of an abnormal battery pack according to the driving speed of the electric-powered vehicle and adaptively delaying the point of discontinuation of use Alternatively, you can stop using the abnormal battery pack without causing safety issues for the driver.

The following drawings attached to the present specification illustrate one embodiment of the present invention, and serve to further understand the technical idea of the present invention together with the detailed description to be described later, so the present invention is limited only to the matters described in such drawings. And should not be interpreted.
1 is a block diagram showing a configuration of an apparatus for controlling output of a parallel multi-battery pack according to an embodiment of the present invention.
2 illustrates an example of a state of charge-output value lookup table according to an embodiment of the present invention.
3 illustrates an example of a driving speed-output relaxation time lookup table according to an embodiment of the present invention.
4 is a flowchart of a method for controlling output of a parallel multi-battery pack according to an embodiment of the present invention.
5 and 6 are graphs showing changes in total output values over time in an embodiment to which a method for controlling output of a parallel multi-battery pack according to the present invention is applied.
7 is a block diagram of a battery management system including an output control device of a parallel multi-battery pack according to the present invention.
8 is a block diagram of an electric drive device including an output control device of a parallel multi-battery pack according to the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to explain their own application in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention. Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are only one embodiment of the present invention and do not represent all the technical spirit of the present invention, and thus various equivalents that can replace them at the time of the present invention It should be understood that there may be variations and variations.

In the embodiments described below, the battery cell refers to a lithium secondary battery. Here, the lithium secondary battery collectively refers to a secondary battery in which lithium ions act as operating ions during charging and discharging to induce an electrochemical reaction at the positive electrode and the negative electrode.

Meanwhile, even if the name of the secondary battery is changed depending on the type of electrolyte or separator used in the lithium secondary battery, the type of packaging material used to package the secondary battery, the internal or external structure of the lithium secondary battery, lithium ions are used as operating ions. Any secondary battery that is used should be interpreted as being included in the category of the lithium secondary battery.

The present invention can also be applied to secondary batteries other than lithium secondary batteries. Therefore, even if the operating ions are not lithium ions, any secondary battery to which the technical idea of the present invention can be applied should be interpreted as being included in the scope of the present invention regardless of the type.

In addition, it should be noted in advance that the battery cell may refer to one unit cell or a plurality of unit cells connected in parallel.

1 is a block diagram showing a configuration of an apparatus for controlling output of a parallel multi-battery pack according to an embodiment of the present invention.

Referring to FIG. 1, when an abnormal battery pack is detected in a parallel multi-battery pack MP in which a plurality of battery packs P1 to Pn are connected in parallel, a corresponding battery pack It is a control device capable of stopping use after alleviating the output value of for a predetermined period of time.

In the present invention, the parallel multi-battery pack MP is defined as a battery module including first to nth battery packs P1 to Pn connected in parallel through the first to nth switch units S1 to Sn. .

In addition, the abnormal battery pack refers to a battery pack that is currently difficult to charge and discharge or is expected to be difficult to charge and discharge in the near future, or a battery pack capable of causing an electric shock or explosion.

For example, a battery pack in which a leakage current is generated, a battery pack that generates an abnormally large amount of heat, a battery pack in which an excessive swelling phenomenon occurs, and the like are abnormal battery packs. A battery pack with a leakage current may cause an electric shock. In addition, a battery pack having a large amount of heat or excessive swelling may cause an ignition or explosion.

The parallel multi-battery pack MP may be connected to the load L through the external switch unit M. The external switch unit M includes an external high potential switch M+ and an external low potential switch M-. The external high-potential switch (M+) and the external low-potential switch (M-) may be relay switches, but the present invention is not limited thereto.

When the external high-potential switch M+ and the external low-potential switch M- are turned on, the parallel multi-battery pack MP is electrically connected to the load L. Conversely, when the external high-potential switch M+ and the external low-potential switch M- are turned off, the electrical connection between the parallel multi-battery pack MP and the load L is released.

Preferably, the parallel multi-battery pack MP may be mounted on the electric drive vehicle E, but the present invention is not limited thereto. The electric drive vehicle (E) refers to a vehicle that can be driven by a motor, such as an electric vehicle or a hybrid vehicle.

The load L is a device that receives power from the parallel multi-battery pack MP, and may be an inverter included in the electric drive vehicle E as an example. The inverter is a power conversion circuit that is installed in front of the electric motor of the electric drive vehicle and converts DC current supplied from the parallel multi-battery pack MP into 3-phase AC current and supplies it to the electric motor.

The load L may also be a DC/DC converter. The DC/DC converter converts the voltage of the DC current supplied from the parallel multi-battery pack (MP) into the driving voltage of the electric unit of the electric drive vehicle (E) or the driving voltage of the ADAS unit and applies it to the electric unit or ADAS unit. It is a conversion circuit.

In the present invention, the type of load (L) is not limited to an inverter or a DC/DC converter, and if a device or device capable of receiving power from a parallel multi-battery pack (MP), the load (L) Can be included in the category of.

Preferably, the device 10 according to the present invention does not immediately stop the use of the abnormal battery pack, but can adaptively control the timing of stopping the use of the abnormal battery pack in consideration of the driving speed of the electric drive vehicle E. .

As an example, the apparatus 10 according to the present invention may delay the time when the abnormal battery pack is stopped as the driving speed of the electric drive vehicle E increases. If the use of the abnormal battery pack is immediately stopped while the electric drive vehicle (E) is driving, the output of the parallel multi-battery pack (MP) changes rapidly, and the control of the electric unit or ADAS unit of the electric drive vehicle (E) is smooth. This is because it is not done properly.

Specifically, the device 10 according to the present invention, when an abnormal battery pack is identified among the first to nth battery packs P1 to Pn connected in parallel through the parallel link node N, the abnormal battery during the output relaxation time. After attenuating the output value of the pack, the switch part included in the abnormal battery pack is turned off.

Each of the first to nth battery packs P1 to Pn includes a plurality of battery cells connected in series therein. That is, the first battery pack P1 includes first to p- _{th battery cells C 11} -C 1p connected in series. In addition, the second battery pack P2 includes first to p- _{th battery cells C 21} -C 2p connected in series. In addition, the third battery pack P3 includes first to p- _{th battery cells C 31} -C 3p connected in series. In addition, the n-th battery pack Pn includes first to p-th battery cells C _n1 -C _np connected in series. Although illustration of the n-1th battery pack from the fourth battery pack is omitted, p battery cells connected in series are included in the same manner as the illustrated battery pack.

Each of the first to nth battery packs P1 to Pn includes switch units S1 to Sn therein. That is, the first battery pack P1 includes the first switch unit S1. In addition, the second battery pack P2 includes a second switch unit S2. In addition, the third battery pack P3 includes a third switch unit S3. In addition, the n-th battery pack Pn includes an n-th switch unit Sn. Although illustration of the n-1th battery pack from the fourth battery pack is omitted, it includes a switch unit in the same manner as the illustrated battery pack.

Each of the first to nth switch units S1 to Sn includes a low potential switch and a high potential switch. That is, the first switch unit S1 includes a first ^{high potential switch S1 +} installed on the high potential side of the first battery pack P1 and a first low potential installed on the low potential side of the first battery pack P1. and a ^- switch (S1). In addition, the second switch unit S2 includes a second ^{high potential switch S2 +} installed on the high potential side of the second battery pack P2 and a second low potential installed on the low potential side of the second battery pack P2. and a ^- switch (S2). In addition, the third switch unit S3 includes a third ^{high-potential switch (S3 +} ) installed on the high-potential side of the third battery pack P3 and a third low-potential switch installed on the low-potential side of the third battery pack P3. and a ^- switch (S3). In addition, the n-th switch unit Sn is an n- ^{th high-potential switch (Sn +} ) installed on the high-potential side of the n-th battery pack (Pn) and the n-th low-potential installed on the low-potential side of the n-th battery pack (Pn). and a ^- switch (S2). Meanwhile, although illustration of the n-1th battery pack from the fourth battery pack is omitted, the high-potential switch and the low-potential switch are included in the same manner as the illustrated battery pack. In addition, in each switch unit, either side of the high-potential switch and the low-potential switch may be omitted.

In the following description, when the switch unit is turned on, the low potential switch may be turned on first and the high potential switch may be turned on later. In addition, when the switch unit is turned off, the high-potential switch may be turned off first and the low-potential switch may be turned off later.

Preferably, the switches constituting the switch units S1 to Sn may be relay switches. Alternatively, the switch units S1 to Sn may be a semiconductor switch such as a MOSFET or a power semiconductor switch, but the present invention is not limited thereto.

A capacitor Cap is provided at the front end of the load L. The capacitor Cap is connected in parallel between the parallel multi-battery pack MP and the load L. The capacitor Cap functions as a filter to prevent the noise current from being applied to the load L side.

The device 10 according to the invention comprises first to nth current sensors I1 to In. The first to nth current sensors I1 to In are installed on the power lines C1 to Cn connected to the first to nth battery packs P1 to Pn, respectively, and current values flowing through the power lines C1 to Cn Measure

That is, the first current sensor I1 measures _{the first battery pack current value I s1} flowing through the first power line C1 included in the first battery pack P1. In addition, the second current sensor I2 measures _{the second battery pack current value I s2} flowing through the second power line C2 included in the second battery pack P2. In addition, the third current sensor I3 measures _{a third battery pack current value I s3} flowing through the third power line C3 included in the third battery pack P3. In addition, the n-th current sensor In measures an _{n-th battery pack current value I sn} flowing through the n-th power line Cn included in the n-th battery pack Pn. Although not shown in the drawings, the fourth to n-1th current sensors measure current values flowing through the fourth to n-1th power lines included in the fourth to n-1th battery packs, respectively. .

In the drawing, it is shown that the first to nth current sensors I1 to In are included in each battery pack. However, the present invention does not limit that the first to nth current sensors I1 to In are installed outside each battery pack.

The first to nth current sensors I1 to In may be Hall sensors. Hall sensors are known current sensors that output a voltage signal corresponding to the magnitude of the current. In another example, the first to nth current sensors I1 to In may be sense resistors. When the voltage applied to both ends of the sense resistor is measured, the magnitude of the current flowing through the sense resistor can be determined using Ohm's law. That is, by dividing the magnitude of the measured voltage by the resistance value of the sense resistor known in advance, the magnitude of the current flowing through the sense resistor can be determined.

The device 10 according to the invention also comprises first to nth voltage sensors V1 to Vn. The first voltage sensor V1 measures _{a first battery pack voltage value V s1} corresponding to a potential difference between the positive electrode and the negative electrode of the first battery pack P1. In addition, the second voltage sensor V2 measures _{a second battery pack voltage value V s2} corresponding to a potential difference between the anode and the cathode of the second battery pack P2. In addition, the third voltage sensor V3 measures _{a third battery pack voltage value V s3} corresponding to a potential difference between the anode and the cathode of the third battery pack P3. In addition, the n-th voltage sensor Vn measures an _{n-th battery pack voltage value V sn} corresponding to a potential difference between the anode and the cathode of the n-th battery pack Pn. Although not shown in the drawings, the fourth to n-1th voltage sensors measure voltage values of the fourth to n-1th battery packs, respectively.

The first to nth voltage sensors V1 to Vn include a voltage measuring circuit such as a differential amplification circuit. Since the voltage measurement circuit is well known in the art, a detailed description of the voltage measurement circuit will be omitted.

The device 10 according to the invention also comprises first to nth temperature sensors T1 to Tn. The first temperature sensor T1 measures _{a first battery pack temperature value T s1} indicating a surface temperature of a cell located at a predetermined position of the first battery pack P1, for example, at the center. In addition, the second temperature sensor T2 measures _{a second battery pack temperature value T s2} indicating a surface temperature of a cell located at a predetermined position of the second battery pack P2, for example, at the center. In addition, the third temperature sensor T3 measures _{a third battery pack temperature value T s3} indicating a surface temperature of a cell located at a predetermined position of the third battery pack P3, for example, at the center. In addition, the n-th temperature sensor Tn measures a _{temperature value T sn of an} n-th battery pack indicating a surface temperature of a cell located at a predetermined position of the n-th battery pack Pn, for example, at the center. Although not shown in the drawing, the fourth to n-1th temperature sensors measure temperature values of the fourth to n-1th battery packs, respectively.

In the present invention, the first current sensor I1, the first voltage sensor V1, and the first temperature sensor T1 constitute the first sensor unit SU1. In addition, the second current sensor I2, the second voltage sensor V2, and the second temperature sensor T2 constitute the second sensor unit SU2. In addition, the third current sensor I3, the third voltage sensor V3, and the third temperature sensor T3 constitute a third sensor unit SU3. In addition, the n-th current sensor In, the n-th voltage sensor Vn, and the n-th temperature sensor Tn constitute an n-th sensor unit SUn. Although not shown in the drawings, the fourth to n-1th sensor units also include a current sensor, a voltage sensor, and a temperature sensor, respectively.

In the present invention, the first to nth sensor units SU1 to SUn may further include other types of sensors.

For example, the first to nth sensor units SU1 to SUn may include pressure sensors. The pressure sensor may be interposed between an outer surface of a battery module in which a plurality of battery cells are stacked and a pack case surrounding the battery module. The pressure sensor may measure the pressure applied by the battery module toward the case when the battery cells are swelled and provide it to the control unit 20.

As another example, the first to nth sensor units SU1 to SUn may include impact detection sensors. The impact detection sensor may be mounted in a pack case surrounding a battery module in which a plurality of battery cells are stacked. The impact detection sensor may provide a shock detection signal to the control unit 20 when a shock exceeding a reference value is applied to the pack case.

The device 10 according to the invention also comprises a communication unit 30. The communication unit 30 forms a communication interface with the control system 40 included in the electric drive vehicle E. Any known communication interface that supports communication between two different communication media may be used as the communication interface. The communication interface may support wired or wireless communication. Preferably, the communication interface may support CAN communication or Daisy Chain communication.

The device 10 according to the invention also comprises a control unit 20 operably coupled with first to nth switch portions S1 to Sn, first to nth sensor units SU1 to SUn.

When a discharging request is received from the control system 40 of the electric drive vehicle E through the communication unit 30, the control unit 20 turns on the external switch unit M to prevent the parallel multi-battery pack MP. Start discharging.

For reference, the M+ signal and the M- signal output from the control unit 20 represent signals for controlling the on-off of the external high-potential switch (M+) and the external low-potential switch (M-), respectively. Further, the S1 to Sn signals output from the control unit 20 represent signals for controlling the on/off of the first to nth switch units S1 to Sn. _{In addition, the V s1} to V _sn signals input to the control unit 20 are signals corresponding to voltage measurement values received from the first to nth voltage sensors V1 to Vn. _{In addition, signals I s1} to I _sn input to the control unit 20 are signals corresponding to measured current values received from the first to nth current sensors I1 to In. _{In addition, the T s1} to T _sn signals input to the control unit 20 are signals corresponding to temperature measurement values received from the first to nth temperature sensors T1 to Tn.

The control unit 20 also includes current sensors I1 to In, voltage sensors V1 to Vn, and temperature included in the first to nth sensor units SU1 to SUn while the parallel multi-battery pack MP is discharged. Controls the operation of the sensors T1 to Tn, and stores the operating characteristic values of each battery pack periodically received from the current sensors I1 to In, voltage sensors V1 to Vn, and temperature sensors T1 to Tn. Record at (50).

Here, the operating characteristic values are current measured values (I _s1 to I _sn ), voltage measured values (V _s1 to V _sn ), and temperature measured values (T _s1 to T _{s2) of the first to nth battery packs P1 to Pn.} ).

The control unit 20 may also determine the state of charge of each battery pack based on the operating characteristic values of the first to nth battery packs P1 to Pn.

As an example, the control unit 20 _{integrates the measured current values (I s1} to I _sn ) of the first to nth battery packs P1 to Pn over time to obtain the first to nth battery packs P1 to Pn. You can determine the state of charge. The control unit 20 measures the open-circuit voltage of each battery pack using the first to nth voltage sensors V1 to Vn before discharging of the first to nth battery packs P1 to Pn starts, and opens An initial value of the charging state of each battery pack may be determined by looking up a charging state corresponding to the open-circuit voltage by referring to the voltage-charging state lookup table.

As another example, the control unit 20 may determine the state of charge of the first to nth battery packs P1 to Pn while the parallel multi-battery pack MP is discharged using the extended Kalman filter. That is, the control unit 20 inputs the operating characteristic values of each battery pack received from the first to nth sensor units SU1 to SUn into the software-coded extended Kalman filter, and the first to nth battery packs P1 To Pn) can be determined.

Extended Kalman filters are widely known in the art to which the present invention pertains. As an example, the extended Kalman filter may be an adaptive algorithm based on an equivalent circuit model or an electrochemical reduced order model (ROM).

Estimation of the state of charge using an extended 　 Kalman 　 filter is an example of Gregory L. Plett's 　 paper 　 "Extended Kalman filtering for battery management systems of LiPB-based HEV battery packs Parts 1, 2 and 3" ( Journal of Power Source 134, 2004, 252-261), and the above papers may be incorporated as part of this specification.

Of course, the state of charge can also be determined by other known methods capable of determining the state of charge by selectively utilizing the operating characteristic values of the battery pack in addition to the above-described current integration method or extended 　 Kalman 　 filter 　.

The control unit 20 may also determine the degree of deterioration of each battery pack based on the operating characteristic values of the first to nth battery packs P1 to Pn.

For example, the control unit 20 may determine an I-V profile for each battery pack through a regression analysis method using a plurality of current values and voltage values for each battery pack recorded in the storage unit 50. Here, the plurality of current values and voltage values are sampled based on the current point in time. In addition, the control unit 20 may calculate a resistance value for each battery pack from the slope of the I-V profile. Also, the degree of degradation of each battery pack may be determined by looking up a current temperature value of each battery pack and a degree of degradation corresponding to the resistance value by referring to a predefined resistance value-degradation degree lookup table for each temperature.

As another example, the control unit 20 may accumulate a current value measured in a specific voltage section from among a plurality of current values for each battery pack recorded in the storage unit 50. In addition, the control unit 20 may determine the degree of deterioration of each battery pack by referring to a current accumulated value-degradation degree look-up table that defines a degree of degeneration in advance according to an accumulated current value in a specific voltage section.

As another example, the control unit 20 may adaptively determine the degree of degradation of the first to nth battery packs P1 to Pn while the parallel multi-battery pack MP is discharged using the extended Kalman filter.

That is, the control unit 20 inputs the operating characteristic values of each battery pack received from the first to nth sensor units SU1 to SUn into the software-coded extended Kalman filter, and the first to nth battery packs P1 To Pn) can be determined.

Estimation of the degree of degeneration using an extended 　 Kalman 　 filter is disclosed in Korean Patent Registration No. 10-0818520, 『An apparatus, method, system and recording medium for estimating the current state and current parameters of an electrochemical cell (CELL). , May be incorporated as part of this specification.

The control unit 20 may also determine an output value corresponding to the state of charge of each battery pack by using predefined first correlation information between the state of charge and the output value.

Preferably, the first correlation information may be a state of charge-output value lookup table defining an output value according to the state of charge of each battery pack.

2 illustrates an example of a state of charge-output value lookup table according to an embodiment of the present invention.

Referring to FIG. 2, a state of charge-output value lookup table has a data structure in which an output value is defined according to a state of charge of a battery pack. In addition, the state of charge-output value lookup table may be independently defined according to the temperature of the battery pack. Although not shown, the state of charge-output value lookup table may be independently defined according to temperature and degree of degradation. The state of charge-output value lookup table may be predefined and recorded in the storage unit 50.

Preferably, the control unit 20 identifies a charge state-output value lookup table to perform a lookup by referring to the current temperature value of each battery pack, and looks up an output value corresponding to the charge state of each battery pack from the identified lookup table. You can decide.

Alternatively, the control unit 20 identifies the charge state-output value look-up table to perform the lookup by referring to the current temperature value and the current deterioration degree of each battery pack, and corresponds to the state of charge of each battery pack from the identified look-up table. It can be determined by looking up the output value.

_{The control unit 20 also calculates the total output value P total} of the parallel multi-battery pack MP based on the minimum output value among the output values of the first to n-th battery packs using Equation 1 below.

<Equation 1>

Total output value (P _total ) = px minimum output value (p is the number of discharged battery packs)

The control unit 20 also transmits the calculated total output value to the control system 40 of the electric drive vehicle E via the communication unit 30. Then, the control system 40 adjusts the power supplied to the load L and the power supplied to the electric unit or ADAS unit according to the total output value. That is, when the total output value is smaller than the total power required for the operation of the load (L), the electric unit, and the ADAS unit, the control system 40 supplies the load (L) or a specific unit according to a preset power distribution policy. Reduces or cuts off the power generated.

Meanwhile, the control unit 20 may identify an abnormal battery pack from among the first to nth battery packs P1 to Pn.

For example, the control unit 20 monitors the temperature measurement values of the first to nth battery packs P1 to Pn measured through the first to nth temperature sensors T1 to Tn, so that the temperature measurement value is a threshold value. Excess battery packs can be identified as abnormal battery packs.

As another example, the control unit 20 may calculate a rate of decrease in the state of charge among the first to n-th battery packs P1 to Pn, and identify a battery pack having a rate of decrease in the state of charge faster than a reference value as an abnormal battery pack. have. While the parallel multi-battery pack MP is discharging, it can be estimated that a leakage current has occurred in the battery pack MP having a relatively high rate of decrease in the state of charge. Since the discharge current and the leakage current flow at the same time in the battery pack MP in which the leakage current is generated, the rate of decrease in the state of charge is relatively fast.

As another example, the control unit 20 may monitor a pressure measurement value output from a pressure sensor installed in each battery pack to identify a battery pack whose pressure measurement value has increased above a threshold value as an abnormal battery pack. In each battery pack, the pressure sensor may be installed so as to be interposed between a battery module in which a plurality of battery cells are stacked and a pack case.

As another example, the control unit 20 may monitor a shock detection signal output from a shock detection sensor installed in each battery pack to identify a battery pack in which the shock detection signal is detected as an abnormal battery pack. The impact detection sensor may be mounted in a pack case surrounding the battery module in each battery pack.

When an abnormal battery pack is identified among n number of battery packs, the control unit 20 adaptively determines the time point of stopping use of the battery pack according to the driving speed of the electric drive vehicle E, and the parallel multi-battery pack MP The method of calculating the total output value of can be changed as follows.

Specifically, the control unit 20, when an abnormal battery pack is identified among the first to nth battery packs P1 to Pn, the driving speed toward the control system 40 of the electric drive vehicle E through the communication unit 30 Request and receive information.

Alternatively, the control unit 20 may periodically receive driving speed information from the control system 40 of the electric drive vehicle E, record it in the storage unit 50, and refer to the recorded driving speed information.

The control unit 20 also determines an output relaxation time corresponding to the travel speed by using the second predefined correlation information between the travel speed and the output relaxation time.

Preferably, the second correlation information may be a driving speed-output relaxation time lookup table defining an output relaxation time according to a driving speed of the electric drive vehicle E.

3 illustrates an example of a driving speed-output relaxation time lookup table according to an embodiment of the present invention.

Referring to FIG. 3, the driving speed-output relaxation time lookup table has a data structure defining the output relaxation time according to the driving speed of the electric drive vehicle E. The driving speed-output relaxation time lookup table may be predefined and recorded in the storage unit 50.

Preferably, when an abnormal battery pack is identified, the control unit 20 may determine an output relaxation time corresponding to the driving speed from the driving speed-output relaxation time look-up table.

Referring to FIG. 3, if the driving speed exceeds 80 km, the output relaxation time may be determined as 30 seconds. In addition, when the driving speed is 60 km or more and 80 km or less, the output relaxation time may be determined as 20 seconds. In addition, when the driving speed is less than 60 km, the output relaxation time may be determined as 10 seconds. Preferably, the driving relaxation time increases in proportion to the driving speed of the electric drive vehicle E. Since the driving speed-output relaxation time lookup table shown in FIG. 3 is only an example, it is obvious that the size of the speed section or the output relaxation time can be changed as much as possible according to the power use policy of the electric drive vehicle E.

The control unit 20 also determines an output relaxation profile of the abnormal battery pack, and determines a relaxation output value of the abnormal battery pack using the output relaxation profile during the output relaxation time.

Preferably, the output relaxation profile is a profile that linearly decreases during the output relaxation time from a current output value of the abnormal battery pack to a preset minimum output value.

That is, in the output relaxation profile, when the current output value of the abnormal battery pack is P ₀ , the output relaxation time according to the driving speed is △t _derate , and the minimum output value is P _min , the output value of the abnormal battery pack is time △t _derate. It is a linear profile that decreases _{from P 0} to P _min over the course of this period.

Here, P _min is a value set in advance in consideration of power to be supplied from the parallel multi-battery pack MP in order to maintain the braking function and the minimum acceleration capability of the electric drive vehicle E. For example, if the number of battery packs included in the parallel multi-battery pack MP is 4 and the minimum power required by the electric drive vehicle E is 20 kW, P _min may be set to 5 kW.

The control unit 20 also determines _{the relaxation output value P derate} of the abnormal battery pack using Equation 2 below with reference to the output relaxation profile while the output relaxation time elapses.

<Equation 2>

Relief output value (P _derate ) = P ₀ -[(P ₀ -P _min )/△t _derate ]*[tt ₀ ]

Here, P ₀ is a current output value of the abnormal battery pack and is a value determined using a state of charge-output value lookup table. P _min is the preset minimum output value. Δt _derate is the output relaxation time determined using the driving speed-output relaxation time lookup table. t ₀ is a time point at which the output of the abnormal battery pack starts to be relaxed, and is a time point when a battery pack that substantially relieves the output is identified as an abnormal battery pack. t is the time elapsed from the start of output relaxation.

The control unit 20 also _{determines the total output value P total,derate} of the parallel multi-battery pack MP from _{the relaxation output value P derate} using Equation 3 below.

<Equation 3>

Total output value (P _total,derate ) = px P _derate (p is the number of discharged battery packs)

The control unit 20 also transmits information about the total output value (P _total,derate ) of the parallel multi-battery pack MP to the control system 40 of the electric drive vehicle E through the communication unit 30, Turn off the switch included in the abnormal battery pack after the output relaxation time (Δt _{derate) has elapsed.}

The control system (0) of the electric drive vehicle (E) _receives the total output value (P _total,derate ) calculated based on the relaxation output value (P _{derate) while the output relaxation time (△t derate) elapses.} The amount of power distributed to the load (L), the electric unit, and the ADAS unit can be gradually adjusted according to the reduced total output value. As a result, the control system 40 can stably distribute power in preparation for interruption of use of the abnormal battery pack.

In the present invention, there is no particular limitation on the type of the storage unit 50 as long as it is a storage medium capable of recording and erasing information. As an example, the storage unit 50 may be RAM, ROM, EEPROM, register, or flash memory. The storage unit 50 can also be electrically connected to the control unit 20 via a data bus, for example, so as to be accessible by the control unit 20.

The storage unit 50 also stores and/or updates a program including various control logics performed by the control unit 20, and/or data generated when the control logic is executed and a predefined lookup table or parameter, and/or /Or erase and/or transmit. The storage unit 50 can be logically divided into two or more, and is not limited to being included in the control unit 20.

In the present invention, the control unit 20 includes a processor known in the art, an application-specific integrated circuit (ASIC), another chipset, a logic circuit, a register, a communication modem, a data processing device, etc. to execute the various control logics described above. Can optionally include. In addition, when the control logic is implemented in software, the control unit 20 may be implemented as a set of program modules. In this case, the program module may be stored in a memory and executed by a processor. The memory may be inside or outside the processor, and may be connected to the processor through various well-known computer components. In addition, the memory may be included in the storage unit 30 of the present invention. In addition, the memory refers to a device in which information is stored regardless of the type of device, and does not refer to a specific memory device.

In addition, at least one or more of various control logics of the control unit 20 may be combined, and the combined control logics may be written in a computer-readable code system and stored in a computer-readable recording medium. There is no particular limitation on the type of the recording medium as long as it can be accessed by a processor included in the computer. As an example, the recording medium includes at least one selected from the group including ROM, RAM, register, CD-ROM, magnetic tape, hard disk, floppy disk, and optical data recording device. In addition, the code system can be distributed, stored and executed on computers connected via a network. In addition, functional programs, codes, and code segments for implementing the combined control logic can be easily inferred by programmers in the art to which the present invention pertains.

The device 10 according to the present invention may be included in the battery management system 100 as shown in FIG. 7. The battery management system 100 controls the overall operation related to charging and discharging a battery, and is a computing system called a Battery Management System in the art.

In addition, the device 10 according to the present invention may be mounted on various electric drive devices 200 in addition to the electric drive vehicle E, as shown in FIG. 8.

The electric drive device 200 may be an electric power device that can be moved by electricity, such as an electric bicycle, an electric motorcycle, an electric train, an electric ship, or an electric plane, or a power tool including a motor such as an electric drill or an electric grinder. . It is obvious to those of ordinary skill in the art that the driving speed can be interpreted as a concept equal to the RPM of the motor when the device 10 according to the present invention is included in the power tool.

4 is a flowchart of a method for controlling output of a parallel multi-battery pack MP according to an embodiment of the present invention.

As shown in FIG. 4, the control unit 20 determines whether the parallel multi-battery pack MP is in a discharged state in step S10. To this end, the control unit 20 may monitor current values measured using the first to nth current sensors I1 to In. If the current values are positive rather than zero, it may be determined that the parallel multi-battery pack MP is discharging. The control unit 20 proceeds to step S20 if the determination result of step S10 is YES.

The control unit 20 controls the first to nth sensor units SU1 to SUn in step S20 to control the first to nth battery packs P1 to Pn from the first to nth sensor units SU1 to SUn. The operating characteristic value is received and recorded in the storage unit 50. The operating characteristic values include voltage values, current values, and temperature values of each battery pack. After step S20, step S30 proceeds.

The control unit 20 determines the state of charge and the degree of degradation of each battery pack in step S30. The method of determining the state of charge and the degree of deterioration has already been described above. After step S30, step S40 proceeds.

The control unit 20 determines whether there is an abnormal battery pack among the first to nth battery packs P1 to Pn in step S40. Various methods for the control unit 20 to identify the abnormal battery pack have already been described above. If the determination result of step S40 is NO, the control unit 20 proceeds to step S50, and conversely, if the determination result of step S40 is YES, the process shifts to step S90.

The control unit 20 determines an output value corresponding to the state of charge of the first to nth battery packs P1 to Pn by using the first correlation information predefined between the state of charge and the output value in step S50. Here, the first correlation information may be a charge state-output value lookup table previously recorded in the storage unit 50.

In the present invention, the state of charge-output value lookup table may be independently defined according to temperature or according to temperature and degree of degradation. In this case, the control unit 20 identifies a charge state-output value lookup table to look up an output value according to the temperature of each battery pack, or a charge state-output value lookup table to look up an output value according to the temperature and deterioration of each battery pack After identification, an output value corresponding to the state of charge of each battery pack may be determined from the identified state of charge-output value lookup table. Step S60 proceeds after step S50.

The control unit 20 determines the total output value of the parallel multi-battery pack MP based on the minimum output value among n output values using Equation 1 described above in step S60. Step S70 proceeds after step S60.

The control unit 20 transmits the total output value of the parallel multi-battery pack MP to the control system 40 of the electric drive vehicle E through the communication unit 30 in step S70. Then, the control system 40 adaptively adjusts the amount of power supplied to the load L and the power supplied to the electric unit and the ADAS unit so as not to exceed the total output value of the transmitted parallel multi-battery pack MP. . Step S80 proceeds after step S70.

The control unit 20 determines whether an output value update period of the parallel multi-battery pack MP has elapsed in step S80. Here, the update period may be preferably 0.5 seconds to 3 seconds. If the determination result in step S80 is YES, the control unit 20 shifts the processor to step S10 and repeats the above-described steps again. On the other hand, if the determination result in step S80 is NO, the control unit 20 suspends the progress of the process until the update period elapses.

On the other hand, if the determination result of step S40 is YES, that is, if an abnormal battery pack is identified among n battery packs, the control unit 20 proceeds to step S90.

The control unit 20 makes a request to the control system 40 side of the electric drive vehicle E through the communication unit 30 in step S90 to receive information on the driving speed of the vehicle. Alternatively, the control system 40 may periodically provide information on the driving speed of the vehicle to the control unit 20 side. In this case, the control unit 20 may refer to the driving speed information provided periodically. Step S100 proceeds after step S90.

The control unit 20 determines an output relaxation time corresponding to the driving speed of the vehicle by using the second correlation information predefined between the driving speed of the vehicle and the output relaxation time in step S100. In this case, the control unit 20 may refer to the travel speed-output relaxation time lookup table illustrated in FIG. 3. After step S100, step S110 proceeds.

The control unit 20 determines an output relaxation profile for the abnormal battery pack defined by Equation 2 described above in step S110. The output relaxation profile is used to calculate the output value of the battery pack identified as an abnormal battery pack during the output relaxation time. After step S110, step S120 proceeds.

The control unit 20 determines _{the relaxation output value P derate} of the abnormal battery pack using the output relaxation profile while the output relaxation time elapses in step S120. After step S120, step S130 proceeds.

_{The control unit 20 determines a total output value P total,derate} of the parallel multi-battery pack MP based on _{the relaxation output value P derate} in step S130 using Equation 3 described above. After step S130, step S140 proceeds.

The control unit 20 transmits the _{total output value P total,derate} determined using Equation 3 to the control system 40 of the electric drive vehicle E through the communication unit 30 in step S140. Then, the control system 40 is the amount of power supplied to the load L and the amount of power supplied to the electric unit and the ADAS unit so as not to exceed _{the total output value (P total,derate} ) of the transmitted parallel multi-battery pack (MP). Adjust adaptively. Step S150 proceeds after step S140.

The control unit 20 determines whether the output update period of the parallel multi-battery pack MP has elapsed in step S150. If the output update period has not elapsed, the control unit 20 suspends the progress of the process.

If the determination result in step S150 is YES, the control unit 20 determines whether the output relaxation time has elapsed in step S160. If the output relaxation time has not elapsed, the control unit 20 shifts the process to step S120 and repeats steps S120 to S140 again. _{Therefore, the control unit 20 transmits the total output value (P total,derate} ) determined using Equation 3 to the control system 40 of the electric drive vehicle E through the communication unit 30 until the output relaxation time elapses. send.

If the determination result of step S160 is YES, since the output relaxation time has elapsed, the control unit turns off the switch included in the abnormal battery pack in order to stop using the abnormal battery pack, and the process proceeds to step S10 again.

Accordingly, while the discharging of the parallel multi-battery pack MP continues, steps S10 to S170 may be repeated according to the control logic shown in the drawing.

5 and 6 are graphs showing changes in total output values over time in an embodiment to which the output control method of the parallel multi-battery pack MP according to the present invention is applied.

According to an embodiment, a multi-battery pack in which two battery packs are connected in parallel is prepared. 5 is a case where the driving speed of the electric drive vehicle is 90 km, and FIG. 6 is a case where the driving speed of the electric driving vehicle is 50 km.

Referring to FIG. 5, pack 1 and pack 2 maintained the same output at 10 kW until _{time t 0.} On the other hand, at time t ₀ , pack 1 was identified as an abnormal battery pack. Since the driving speed of the electric vehicle is 90 km, the power relaxation time was determined to be 30 seconds. In addition, in consideration of the brake function and minimum acceleration capability of the electric drive vehicle, the minimum output is preset to 5kW. From time t ₀ , the output for pack 1 is calculated as a relaxed value for 30 seconds according to the output relaxation profile determined by Equation 2. As a result, for 30 seconds, the total output value P _total,derate is determined according to Equation 3, and the determined total output value P _total,derate is transmitted to the control system 40 of the electric drive vehicle E. After 30 seconds have elapsed, since the switch part included in the first pack is turned off, the discharge of the first pack is stopped. Then, since only the second pack is discharged, the total output value of the parallel multi-battery pack MP becomes equal to 10kW, which is the output value of the second pack.

Referring to FIG. 6, pack 1 and pack 2 maintained the same output at 10 kW until _{time t 0.} On the other hand, at time t ₀ , pack 1 was identified as an abnormal battery pack. Since the driving speed of the electric vehicle is 50 km, the power relaxation time was determined to be 10 seconds. In addition, in consideration of the brake function and minimum acceleration capability of the electric drive vehicle, the minimum output is preset to 5kW. From the time point t _0, the output for the first pack for 10 seconds is calculated as a value relaxed from 10 kW to 5 kW according to the output relaxation profile determined by Equation 2. As a result, for 10 seconds, the total output value P _total,derate is determined according to Equation 3, and the determined total output value P _total,derate is transmitted to the control system 40 of the electric drive vehicle E. After 10 seconds have elapsed, since the switch part included in the first pack is turned off, the discharge of the first pack is stopped. Then, since only the second pack is discharged, the total output value of the parallel multi-battery pack MP becomes the same as 10kW, which is the output value of the second pack.

According to the present invention, when some of the battery packs included in the parallel multi-battery pack are identified as abnormal battery packs, safety problems to the vehicle or the driver may be caused by adaptively delaying the timing of stopping the use of the abnormal battery pack according to the driving speed of the electric vehicle. It can reduce the output of the parallel multi-battery pack without causing it.

In addition, since the total output value of the parallel multi-battery pack is adaptively attenuated according to the driving speed of the electric-powered vehicle until the use of the abnormal battery pack is stopped, it is possible to respond to power attenuation to the control system that controls the electric-powered vehicle. By providing sufficient time, the power distribution policy can be operated stably.

In describing various embodiments of the present invention, the constituent elements named'~unit' should be understood as functionally distinct elements rather than physically distinct elements. Accordingly, each component may be selectively integrated with other components, or each component may be divided into sub-components for efficient execution of the control logic(s). However, even if the constituent elements are integrated or divided, it is obvious to those skilled in the art that if the functional identity can be recognized, the consolidated or divided constituent elements should be interpreted as being within the scope of the present invention.

In the above, although the present invention has been described by limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following will be described by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations are possible within the equal scope of the claims.

Claims (14)

First to nth sensor units for measuring operation characteristic values of n battery packs connected in parallel to each other included in the parallel multi-battery pack;
A communication unit forming a communication interface with the control system of the electric drive vehicle; And
And a control unit operably coupled to the first to nth sensor units and the communication unit,
The control unit,
Determining a state of charge of each battery pack based on an operating characteristic value of each battery pack received from the first to nth sensor units,
An output value corresponding to the state of charge of each battery pack is determined using first predefined correlation information between the state of charge and the output value,
Receiving the driving speed information of the vehicle from the control system of the electric drive vehicle through the communication unit,
When an abnormal battery pack is identified among n battery packs, the output relaxation time corresponding to the driving speed of the vehicle is determined using the second predefined correlation information between the driving speed of the vehicle and the output relaxation time,
Determine an output relaxation profile of the abnormal battery pack, and determine a relaxation output value of the abnormal battery pack by referring to the output relaxation profile during the output relaxation time,
Transmitting information about the total output value determined based on the relaxation output value to the control system of the electric drive vehicle through the communication unit,
The output control apparatus of a parallel multi-battery pack, characterized in that configured to turn off a switch included in the abnormal battery pack after the output relaxation time has elapsed.
The method of claim 1,
The first correlation information is a state-of-charge lookup table defining an output value according to a state of charge of the battery pack.
The method of claim 1,
The second correlation information is a driving speed-output relaxation time lookup table defining an output relaxation time according to a driving speed of an electric vehicle.
The method of claim 3,
The output relaxation time increases in proportion to the speed of the electric vehicle.
The method of claim 1,
The output relaxation profile is a profile that linearly decreases during the output relaxation time from a current output value of the abnormal battery pack to a preset minimum output value.
The method of claim 1,
The control unit is configured to calculate a value obtained by multiplying a relaxation output value calculated from the output relaxation profile and the number of battery packs as a total output value while the output relaxation time elapses. controller.
A battery management system comprising an output control device of a parallel multi-battery pack according to claim 1.
An electric drive vehicle comprising the output control device of the parallel multi-battery pack according to claim 1.
(a) first to n-th sensor units measuring operation characteristic values for n battery packs connected in parallel to each other included in the parallel multi-battery pack; And providing a communication unit that forms a communication interface with a control system of the electric drive vehicle.
(b) receiving an operating characteristic value of each battery pack from the first to nth sensor units;
(c) determining a state of charge of each battery pack based on an operating characteristic value of each battery pack;
(d) determining an output value corresponding to the state of charge of each battery pack using first predefined correlation information between the state of charge and the output;
(e) receiving driving speed information of the vehicle from the control system of the electric drive vehicle through the communication unit;
(f) identifying an abnormal battery pack among n battery packs and determining an output relaxation time corresponding to the driving speed of the vehicle by using second predefined correlation information between the driving speed of the vehicle and the output relaxation time;
(g) determining an output relaxation profile of the abnormal battery pack, and determining a relaxation output value of the abnormal battery pack by referring to the output relaxation profile during the output relaxation time;
(h) transmitting information on a total output value determined based on the relaxation output value to a control system of an electric drive vehicle through the communication unit; And
(i) turning off a switch included in the abnormal battery pack after the output relaxation time has elapsed.
The method of claim 9,
The first correlation information is a state-of-charge lookup table defining an output value according to a state of charge of the battery pack.
The method of claim 9,
The second correlation information is a driving speed-output relaxation time lookup table defining an output relaxation time according to a driving speed of an electric vehicle.
The method of claim 11,
The output relaxation time increases in proportion to the speed of the electric vehicle.
The method of claim 9,
The output relaxation profile is a profile that linearly decreases during the output relaxation time from a current output value of an abnormal battery pack to a preset minimum output value.
The method of claim 9, wherein step (h),
And calculating a value obtained by multiplying the number of battery packs and the relaxation output value calculated from the output relaxation profile while the output relaxation time elapses as a total output value. .

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