KR102324847B1 - Apparatus for managing battery, battery pack including the same and vehicle including the same - Google Patents

Abstract

The battery management apparatus according to the present invention includes a driving voltage output unit for receiving an output voltage of a battery module and outputting it as a first driving voltage; A sensing unit, a voltage boosting unit that boosts the output voltage in response to the detection result of the first short detection unit and outputs the boosted voltage, and a voltage booster that receives and drives the boosted voltage, and changes the electrical connection between the battery module and the output terminal and a relay opening/closing unit for opening and closing the relay, and the driving voltage output unit may further receive the boosted voltage and output it as a first driving voltage.

Description

Apparatus for managing battery, battery pack including the same and vehicle including the same}

The present invention relates to a battery management device, a battery pack including the same, and a vehicle, and more particularly, to a battery management device capable of operating a driving voltage output unit by outputting a boosted voltage even when a disconnection occurs in a battery module, and a battery including the same It's about packs and cars.

Secondary batteries that are easy to apply according to product groups and have electrical characteristics such as high energy density are universally used in portable devices as well as electric vehicles (EVs) or hybrid vehicles (HVs) driven by an electric drive source. is being applied

These secondary batteries are environmentally friendly and energy efficient in that they do not generate any by-products due to the use of energy as well as the primary advantage of dramatically reducing the use of fossil fuels by being able to continuously repeat charging and discharging by electrochemical reactions. It is attracting attention as a new source of energy utilization for improvement.

The battery pack applied to the vehicle generally includes an assembly including a plurality of unit secondary battery cells and a plurality of the assembly or battery module, and the cells include a positive electrode current collector, a separator, an active material, an electrolyte, and an aluminum thin film layer. It becomes a structure capable of charging and discharging by an electrochemical reaction between components, including the like.

The battery pack is an algorithm for controlling power supply to a driving load such as a motor, measuring electrical characteristic values such as current and voltage, charging/discharging control, voltage equalization control, and estimating SOC (State Of Charge). This is applied, and the battery management system (BMS) that monitors and controls the state of the secondary battery is additionally included.

In general, such a BMS receives an output voltage from a battery module included in a battery pack, reduces the output voltage through a regulator inside the BMS, and outputs it to other circuits and components inside the BMS.

That is, the regulator inside the BMS reduces the output voltage of the high voltage battery module to a low voltage driving voltage for driving the circuits and components inside the BMS.

In this case, the regulator must receive a voltage greater than or equal to a predetermined voltage value, but can output a driving voltage for driving circuits and components inside the BMS.

However, when the battery pack is left in a low temperature environment for a long time or a short occurs inside the battery pack, the battery module is discharged and a low voltage voltage is output from the battery module to the regulator due to the discharge of the battery module.

Accordingly, the regulator receives a voltage less than a predetermined voltage value, and thus cannot output a driving voltage for driving circuits and components inside the BMS. As a result, a problem occurs that the BMS is not driven.

In the present invention, the first disconnection detection unit detects disconnection of the battery module, and when disconnection is detected, the voltage booster boosts the output voltage of the battery module to output the boosted voltage to the circuit in the BMS, so that the battery module is disconnected due to disconnection of the battery module. An object of the present invention is to provide a battery management device capable of outputting a voltage to a circuit in a BMS even when discharged, a battery pack including the same, and a vehicle.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned may be understood by the following description, and will be more clearly understood by the examples of the present invention. Moreover, it will be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

A battery management apparatus according to the present invention for solving the above technical problem includes a driving voltage output unit for receiving an output voltage of a battery module and outputting it as a first driving voltage, receiving the first driving voltage and driving, A first short-circuit detection unit for detecting a short circuit, a voltage boosting unit for boosting the output voltage in response to the detection result of the first short-circuit detection unit and outputting it as a boosted voltage, and a voltage booster for receiving and driving the boosted voltage, the battery module and the output It may include a relay opening/closing unit for opening and closing a relay for changing an electrical connection between terminals.

Preferably, the driving voltage output unit may further receive the boosted voltage and output it as a first driving voltage.

Preferably, when the short circuit of the battery module is detected as a result of the detection of the first short circuit detecting unit, the voltage boosting unit may boost the output voltage to output the boosted voltage.

Preferably, the voltage booster may receive the boosted voltage and output it as a second driving voltage.

Preferably, the relay opening/closing unit may be driven by further receiving the second driving voltage.

Preferably, the battery management device is driven by receiving the second driving voltage, a second short circuit detecting unit detecting a short circuit of the battery module and driving by receiving the second driving voltage, and the second short circuit detecting unit The control unit may further include a control unit for outputting a relay opening signal or a relay closing signal to the relay opening/closing unit in response to the detection result.

Preferably, when a short circuit of the battery module is detected as a result of the detection of the second short circuit detection unit, the control unit may output the relay open signal to the relay opening/closing unit.

Preferably, the relay opening/closing unit may receive the relay opening signal to open the relay.

Preferably, the control unit may output the relay closing signal to the relay opening/closing unit when a short circuit of the battery module is detected as a result of the detection of the second short circuit detecting unit.

Preferably, the relay opening/closing unit may receive the relay closing signal to close the relay.

Preferably, the boosted voltage may have a voltage value equal to or greater than a minimum driving voltage value of at least one of the driving voltage output unit and the relay opening/closing unit.

Preferably, the second driving voltage may have a voltage value greater than or equal to a minimum driving voltage value of at least one of the second short-circuit detection unit, the control unit, and the relay opening/closing unit.

The battery pack according to the present invention may include the battery management device.

The vehicle according to the present invention may include the battery management device.

According to the present invention, the first disconnection detection unit detects disconnection of the battery module, and when disconnection is detected, the voltage boosting unit boosts the output voltage of the battery module to output the boosted voltage to the circuit in the BMS, so that the disconnection of the battery module As a result, even if the battery module is discharged, the voltage is output to the circuit in the BMS, thereby maintaining the operation of the BMS for a long time.

1 is a diagram schematically illustrating a configuration of a battery management apparatus and a battery pack including the same according to an embodiment of the present invention.
2 is a circuit diagram of a battery management apparatus and a battery pack including the same according to an embodiment of the present invention.
3 is a circuit diagram illustrating a voltage flow in the BMS when a short circuit in the battery module does not occur.
4 and 5 are circuit diagrams illustrating a voltage flow in the BMS when a short circuit occurs in the battery module.
6 is a circuit diagram illustrating a voltage and signal flow for relay control driving of the BMS when a short circuit occurs in the battery module.
7 is a circuit diagram illustrating a voltage and signal flow in a BMS according to another embodiment of the present invention.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

1 is a diagram schematically illustrating a configuration of a battery management apparatus and a battery pack including the same according to an embodiment of the present invention, and FIG. 2 is a battery management apparatus according to an embodiment of the present invention and a battery pack including the same. is the circuit diagram of

1 and 2 , a battery management system (BMS, 100, hereinafter referred to as 'BMS') according to an embodiment of the present invention includes a driving voltage output unit 110 and a first short-circuit detection unit. 120 , voltage booster 130 , second short detection unit 140 , control unit 150 , relay opening/closing unit 160 , real-time clock unit 170 , service recharging unit 180 and sensing unit 190 . ) may be included.

The battery pack 1000 including the BMS 100 may further include a battery module 200, a relay R, a shunt resistor S, a first input/output terminal T1, and a second input/output terminal T2. can

More specifically, as shown in FIG. 2 , the battery module 200 included in the battery pack 1000 is configured by connecting a plurality of battery cells in series, and the positive terminal and the negative terminal of the battery module 200 are respectively It may be connected to the first input/output terminal T1 and the second input/output terminal T2.

In addition, a relay R is connected between the positive terminal of the battery module 200 and the first input/output terminal T1 , and a shunt resistor S is connected between the negative terminal of the battery module 200 and the second input/output terminal T2 . ) can be connected.

The first input/output terminal T1 and the second input/output terminal T2 are connected to the external device L to input and output power, so that the battery module 200 is charged or power is supplied from the battery module 200 to the external device ( L) can be supplied.

Here, the external device L may be a lead acid battery pack.

Meanwhile, the BMS 100 according to an embodiment of the present invention may be connected to the positive terminal and the negative terminal of the battery module 200 to receive the output voltage V1 of the battery module 200 .

Here, the output voltage V1 may mean a voltage output from the positive terminal of the battery module 200 .

Hereinafter, the BMS 100 according to an embodiment of the present invention will be described in detail.

First, when the short circuit of the battery module 200 does not occur, the operation of the BMS 100 will be described.

3 is a circuit diagram illustrating a voltage flow in the BMS when a short circuit in the battery module does not occur.

3 , the driving voltage output unit 110 is connected to the positive terminal of the battery module 200 to receive the output voltage V1 of the battery module 200 and transform the output voltage V1 to produce One driving voltage (V2) can be output.

More specifically, the driving voltage output unit 110 outputs a high voltage output voltage V1 to output a first driving voltage V2 for driving a component included in the BMS 100 according to an embodiment of the present invention. ) may be reduced to output the first driving voltage V2.

Here, the voltage value of the output voltage V1 of the battery module 200 may be 12V, and the voltage value of the first driving voltage V2 output from the driving voltage output unit 110 may be 5V.

That is, the driving voltage output unit 110 receives the output voltage V1 of the battery module 200, which is a high voltage value for a component included in the BMS 100 according to an embodiment of the present invention to receive an input as a driving voltage. The pressure may be reduced to an appropriate voltage and output as the first driving voltage V2.

The driving voltage output unit 110 receives a voltage exceeding the minimum driving voltage value, but performs the above-described reduced-pressure driving to drive the components included in the BMS 100 according to an embodiment of the present invention. One driving voltage V2 may be output.

That is, the driving voltage output unit 110 outputs the first driving voltage V2 when the voltage value of the output voltage V1 of the battery module 200 exceeds the minimum driving voltage value. Components included in the BMS 100 according to the example may be driven.

Here, the minimum driving voltage value of the driving voltage output unit 110 may be 7V.

If the voltage value of the output voltage V1' of the battery module 200 is less than the minimum driving voltage value of the driving voltage output unit 110, the driving voltage output unit 110 does not output the first driving voltage V2. As a result, the first driving voltage V2 for driving the components included in the BMS 100 according to an embodiment of the present invention cannot be output.

Accordingly, the voltage boosting unit 130 to be described later boosts the output voltage V1 of the battery module 200 when the output voltage V1 ′ of the battery module 200 is low due to a short circuit of the battery module 200 . The boosted voltage V3 may be output to the driving voltage output unit 110 .

The driving of the voltage booster 130 will be described later.

Meanwhile, the driving voltage output unit 110 outputs the reduced first driving voltage V2 to a first short circuit detecting unit 120 , a voltage boosting unit 130 , a real-time clock unit 170 , and a service recharging unit ( which will be described later). 180) can be printed.

Accordingly, the first short-circuit detecting unit 120 , the real-time clock unit 170 , and the service recharging unit 180 may be driven by receiving the first driving voltage V2 .

Also, the voltage booster 130 may receive the first driving voltage V2 and be driven in a standby state.

Preferably, the driving voltage output unit 110 according to the present invention may be a real-time clock regulator.

Hereinafter, when a short circuit occurs in the battery module 200, the operation of the BMS 100 will be described.

4 and 5 are circuit diagrams illustrating a voltage flow in the BMS when a short circuit occurs in the battery module.

Referring further to FIG. 4 , the first short-circuit detection unit 120 is driven by receiving the first driving voltage V2 , and may detect a short circuit of the battery module 200 .

More specifically, the first short-circuit detection unit 120 compares the voltages at both ends of the shunt connected between the negative terminal of the battery module 200 and the second input/output terminal T2 of the battery pack 1000 to compare the voltages at both ends of the battery module 200 . ), it is determined whether a high current (I) flows through the negative terminal, and based on the determination result, it is possible to detect whether a short circuit occurs in the battery module 200 .

That is, when it is determined that the high current I flows as a result of comparing the voltages of both ends of the shunt resistor S, the first short-circuit detection unit 120 may detect that a short circuit has occurred in the battery module 200 .

To this end, the first short-circuit detection unit 120 may be a comparator that receives the voltage across the shunt resistor S and compares the voltages at both ends.

On the other hand, when a short circuit occurs in the battery module 200 and the high current I flows for a long time, the voltage value of the output voltage V1 ′ of the battery module 200 is less than or equal to the minimum driving voltage value of the driving voltage output unit 110 . can That is, when a short circuit occurs in the battery module 200, the battery module 200 is discharged by energization of the high current I, and thus, the output voltage V1 ′ of the battery module 200 may be output as a low voltage. .

Accordingly, when a short circuit of the battery module 200 is detected by the first short-circuit detection unit 120 , the low-voltage output voltage V1 ′ may be input to the driving voltage output unit 110 . Accordingly, the driving voltage output unit 110 may not output the first driving voltage V2 .

For example, when a short circuit of the battery module 200 is detected by the first short-circuit detection unit 120 , the output voltage V1 ′ of the battery module 200 may be output as a voltage value of 2.5V or less. Accordingly, the driving voltage output unit 110 having the minimum driving voltage value of 7V receives the output voltage V1' of the battery module 200 having a voltage value of 2.5V or less, and outputs the first driving voltage V2. may not be able to

Meanwhile, when the short circuit of the battery module 200 is detected, the first short-circuit detection unit 120 may output a first short-circuit detection signal S1 to the voltage booster 130 to be described later.

Conversely, when the short circuit of the battery module 200 is not detected, the first short-circuit detection unit 120 may not output the first short-circuit detection signal S1 to the voltage booster 130 to be described later.

The voltage booster 130 may boost the output voltage V1 ′ of the battery module 200 in response to the detection result of the first short circuit detector 120 described above and output the boosted voltage V3 .

More specifically, when the short circuit of the battery module 200 is detected as a result of the detection of the first short circuit detection unit 120 , the voltage boosting unit 130 boosts the output voltage V1 ′ of the battery module 200 to increase the boosted voltage. (V3) can be output.

In other words, when receiving the first short-circuit detection signal S1 from the first short-circuit detection unit 120 , the voltage booster 130 boosts the output voltage V1' of the battery module 200 having a low voltage value. to output the boosted voltage V3 to the driving voltage output unit 110 .

In addition, when receiving the first short-circuit detection signal S1 from the first short-circuit detection unit 120, the voltage booster 130 boosts the output voltage V1' of the battery module 200 to a relay opening/closing unit (described later) ( 160) to output the boosted voltage V3.

Here, the voltage value of the boosted voltage V3 may be equal to or greater than the minimum driving voltage value of at least one of the driving voltage output unit 110 and the relay opening/closing unit 160 to be described later.

For example, as described above, the voltage value of the boosted voltage V3 may be 7V, which is the minimum driving voltage value that the driving voltage output unit 110 needs to receive in order to output the first driving voltage V2 .

Through this, even if a short circuit occurs in the battery module 200 and the output voltage V1 ′ of the battery module 200 is low, the driving voltage output unit 110 outputs the boosted voltage V3 boosted by the voltage booster 130 . ) may be input and output the first driving voltage V2 to circuits and components inside the BMS.

Meanwhile, the voltage boosting unit 130 may boost the output voltage V1 ′ of the battery module 200 to receive the boosted voltage V3 again. 5 , the voltage boosting unit 130 may input the boosted boosted voltage V3 to itself.

Thereafter, the voltage booster 130 may receive the boosted voltage V3 and output it as the second driving voltage V4 .

Through this, the voltage boosting unit 130 outputs the second driving voltage V4 other than the boosted voltage V3, so that the component included in the BMS 100 according to an embodiment of the present invention receives an input for driving. Multiple voltages can be output.

The voltage boosting unit 130 may output the second driving voltage V4 to the relay opening/closing unit 160 , and a second short-circuit detecting unit 140 and control unit 150 to be described later.

Hereinafter, when a short circuit occurs in the battery module, the relay (R) control operation of the BMS will be described.

6 is a circuit diagram illustrating a voltage and signal flow for relay control driving of the BMS when a short circuit occurs in the battery module.

Referring further to FIG. 6 , the second short-circuit detection unit 140 is driven by receiving the second driving voltage V4 , and may detect a short circuit of the battery module 200 .

More specifically, the second short-circuit detection unit 140 compares the voltages between the both ends of the shunt connected between the negative terminal of the battery module 200 and the second input/output terminal T2 of the battery pack 1000 to the battery module 200 . ), it is determined whether a high current (I) flows through the negative terminal, and based on the determination result, it is possible to detect whether a short circuit occurs in the battery module 200 .

That is, when it is determined that the high current I flows as a result of comparing the voltages at both ends of the preceding term of the shunt, the second short-circuit detection unit 140 may detect that a short circuit has occurred in the battery module 200 .

To this end, the second short-circuit detection unit 140 may be an OP-AMP that receives the voltage across the shunt resistor S and compares the voltages between both ends.

As described above, when a short circuit occurs in the battery module 200 and the high current I flows for a long time, the voltage value of the output voltage V1 ′ of the battery module 200 is the minimum driving voltage of the driving voltage output unit 110 . It may be less than the voltage value. That is, when a short circuit occurs in the battery module 200, the battery module 200 is discharged by energization of the high current I, and thus, the output voltage V1 ′ of the battery module 200 may be output as a low voltage. .

Accordingly, when a short circuit of the battery module 200 is detected by the second short-circuit detection unit 140 , the low-voltage output voltage V1 may be input to the driving voltage output unit 110 . Accordingly, the driving voltage output unit 110 may not output the first driving voltage V2 .

For example, when a short circuit of the battery module 200 is detected by the second short-circuit detection unit 140 , the output voltage V1 ′ of the battery module 200 may be output as a voltage value of 2.5V or less. Accordingly, the driving voltage output unit 110 having the minimum driving voltage value of 7V receives the output voltage V1' of the battery module 200 having a voltage value of 2.5V or less, and outputs the first driving voltage V2. may not be able to

Meanwhile, when the short circuit of the battery module 200 is detected, the second short detection unit 140 may output a second short circuit detection signal S2 to the controller 150 , which will be described later.

Conversely, when the short circuit of the battery module 200 is not detected, the second short detection unit 140 may not output the second short circuit detection signal S2 to the voltage booster 130 to be described later.

The control unit 150 is driven by receiving the second driving voltage V4, and in response to the detection result of the second short-circuit detection unit 140, the relay opening signal S3 or the relay closing signal S4 to the relay opening/closing unit 160 ) can be printed.

More specifically, when receiving the second short-circuit signal from the second short-circuit detection unit 140 , the control unit 150 may output the relay opening signal S3 to the relay opening/closing unit 160 to open the relay R. have.

Conversely, if the control unit 150 does not receive the second short-circuit signal from the second short-circuit detection unit 140, the relay closing signal ( S4) can be output.

Through this, when a short circuit occurs in the battery module 200 and the battery module 200 is discharged, the controller 150 controls the relay (R) so that the power of the battery module 200 is no longer output to the external device (L). By outputting the relay open signal S3 for opening the , complete discharge of the battery module 200 may be blocked.

Meanwhile, the controller 150 may include at least one processor and may be configured to manage the overall operation of the BMS 100 .

Each processor included in the control unit 150 selectively selects a processor, an application-specific integrated circuit (ASIC), other chipsets, logic circuits, registers, communication modems, data processing devices, etc. known in the art to execute various control logics. may include

At least one or more of the various control logics of the control unit 150 may be combined, and the combined control logics may be written in a computer-readable code system and recorded in a computer-readable recording medium.

Here, the type of the recording medium is not particularly limited as long as it is accessible by the processor. For example, the recording medium may include at least one selected from the group consisting of a ROM, a RAM, a register, a CD-ROM, a magnetic tape, a hard disk, a floppy disk, and an optical data recording device.

Here, the code scheme may be modulated into a carrier signal and included in a communication carrier at a specific time, and may be executed by a processor. In addition, functional programs, codes, and code segments for implementing the combined control logics can be easily inferred by programmers in the art to which the present invention pertains.

The relay opening/closing unit 160 may receive the relay opening signal S3 or the relay closing signal S4 from the control unit 150 to control the relay R.

More specifically, the relay opening/closing unit 160 may open the relay R by blocking the current flowing in the electromagnet adjacent to the relay R upon receiving the relay opening signal S3 from the control unit 150 .

Conversely, the relay opening/closing unit 160 may close the relay R by applying a current to an electromagnet adjacent to the relay R upon receiving the relay closing signal S4 from the control unit 150 .

The type of the relay opening/closing unit 160 may not be limited as long as it controls opening/closing of the relay R.

Hereinafter, the operation of the BMS 100 according to another embodiment of the present invention will be described.

7 is a circuit diagram illustrating a voltage and signal flow in a BMS according to another embodiment of the present invention.

Referring to FIG. 7 , the BMS 100 according to another embodiment of the present invention has the same components as the BMS 100 according to an embodiment of the present invention, but the voltage booster 130 includes the battery module 200 . A condition for boosting the output voltage V1 ′ of , and outputting it as the boosted voltage V3 may be further added.

Therefore, repeated description will be omitted.

The voltage boosting unit 130 according to another embodiment boosts the output voltage V1 of the battery module 200 when an additional condition is established in addition to the condition for receiving the first short-circuit signal from the first short-circuit detection unit 120 . and output as a boosted voltage (V3).

More specifically, the voltage boosting unit 130 receives the interrupt signal S5 from the real-time clock unit 170, the condition of receiving the Wake UP signal S6 from the external communication unit, and the service recharge unit When the condition that the service recharge detection signal S7 is input from 180 and the condition that the standby signal S8 is input from the control unit 150 are satisfied, the output voltage V1 of the battery module 200 is boosted to increase the voltage ( V3) can be output.

Through this, the BMS 100 according to an exemplary embodiment of the present invention boosts the voltage in response to various cases requiring boosting of the output voltage V1 of the battery module 200 as well as when a short circuit occurs in the battery module 200 . The unit 130 may boost the output voltage V1 of the battery module 200 to output the boosted voltage V3 .

Meanwhile, the battery management apparatus according to the present invention may be applied to a vehicle such as an electric vehicle or a hybrid vehicle. That is, the vehicle according to the present invention may include the battery management device according to the present invention.

For those of ordinary skill in the art to which the present invention pertains, various substitutions, modifications and changes are possible within the scope of the present invention without departing from the technical spirit of the present invention. is not limited by

100: battery management device
110: driving voltage output unit 120: first short-circuit detection unit
130: voltage boosting unit 140: second short-circuit detection unit
150: control unit 160: relay opening and closing unit
170: real-time clock unit 180: service recharge unit
190: sensing unit
200: battery module 1000: battery pack

Claims (11)

a driving voltage output unit receiving the output voltage of the battery module and outputting it as a first driving voltage;
a first short-circuit detection unit which is driven by receiving the first driving voltage and detects a short circuit of the battery module;
a voltage boosting unit that boosts the output voltage in response to the detection result of the first short-circuit detector, outputs a boosted voltage, and receives the output boosted voltage to output a second driving voltage;
a relay opening/closing unit for receiving and driving the boosted voltage and opening and closing a relay for changing an electrical connection between the battery module and an output terminal;
a second short-circuit detection unit which is driven by receiving the second driving voltage and detects a short circuit of the battery module; and
and a control unit driven by receiving the second driving voltage and outputting a relay opening signal or a relay closing signal to the relay opening/closing unit in response to a detection result of the second short circuit sensing unit;
The driving voltage output unit
The battery management device, characterized in that the boosted voltage is further input and output as a first driving voltage.
According to claim 1,
The voltage boosting unit
When the short circuit of the battery module is detected as a result of the detection of the first short circuit detection unit, the battery management device boosts the output voltage and outputs the boosted voltage.
delete According to claim 1,
The relay opening and closing part
A battery management device driven by further receiving the second driving voltage.
delete According to claim 1,
the control unit
When the short circuit of the battery module is detected as a result of the detection of the second short circuit detection unit, the relay opening signal is output to the relay opening and closing unit,
The relay opening and closing part
A battery management device for receiving the relay opening signal and opening the relay.
According to claim 1,
the control unit
When the short circuit of the battery module is detected as a result of the detection of the second short circuit detection unit, the relay closing signal is output to the relay opening and closing unit,
The relay opening and closing part
A battery management device for receiving the relay closing signal to close the relay.
According to claim 1,
The boosted voltage is
A battery management device having a voltage value equal to or greater than a minimum driving voltage value of at least one of the driving voltage output unit and the relay opening/closing unit.
According to claim 1,
The second driving voltage is
A battery management device having a voltage value equal to or greater than the minimum driving voltage value of at least one of the second short-circuit detection unit, the control unit, and the relay opening/closing unit.
A battery pack comprising the battery management device according to any one of claims 1, 2, 4 and 6 to 9.
10. A motor vehicle comprising the battery management device according to any one of claims 1, 2, 4 and 6 to 9.

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