Voltage generating device, battery management device, and battery management method

Abstract

To provide a battery management apparatus capable of diagnosing operation of an over-current detection function of a battery, a voltage generation apparatus and a battery management method.SOLUTION: A battery management apparatus includes a voltage generation unit 220 configured to generate a first output value and a second output value which have a difference therebetween corresponding to a magnitude of a voltage applied to a shunt resistor 210 connected to a battery 100, in which the difference between the first output value and the second output value corresponds to the magnitude of the voltage applied to the shunt resistor when charging over-current or discharging over-current flows in the shunt resistor.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This application claims the benefit of priority based on Korean Patent Application No. 10-2021-0023639, filed on February 22, 2021, and all contents disclosed in the documents of this Korean patent application are incorporated herein by reference.

[0002] The present disclosure relates to a battery management device. [Background technology]

[0003] Recently, research and development into secondary batteries has been actively conducted. Here, secondary batteries are batteries that can be charged and discharged, and include both conventional Ni / Cd batteries, Ni / MH batteries, and the latest lithium-ion batteries. Among secondary batteries, lithium-ion batteries have the advantage of having a much higher energy density than conventional Ni / Cd batteries, Ni / MH batteries, etc. Furthermore, lithium-ion batteries can be manufactured in a compact and lightweight form and are used as power sources for mobile devices. Recently, their use has expanded to include power sources for electric vehicles, drawing attention as a next-generation energy storage medium.

[0004] Meanwhile, in the case of lithium-ion batteries, if an overcurrent flows during charging or discharging, the temperature inside the battery rises, and in the worst case, it can lead to a fire in the vehicle the battery is installed in. To prevent this situation, an overcurrent detection function is required to continuously determine whether an overcurrent is flowing through the battery, and the integrity of the overcurrent detection function must also be guaranteed. Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the embodiments disclosed herein is to provide a battery management device that can diagnose the operation of a battery's overcurrent detection function.

[0006] The technical problems of the embodiments disclosed in this document are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0007] A battery management device according to one embodiment disclosed in this document includes a shunt resistor connected to a battery and a voltage generating unit that generates a first output value and a second output value having a difference corresponding to the magnitude of a voltage applied to the shunt resistor, and the difference between the first output value and the second output value may correspond to the magnitude of the voltage applied to the shunt resistor when a charging overcurrent or a discharging overcurrent flows through the shunt resistor.

[0008] In one embodiment, the voltage generating unit may generate the first output value and the second output value in a state in which the charging overcurrent or the discharging overcurrent does not flow through the shunt resistor.

[0009] In one embodiment, when a charging overcurrent flows through the shunt resistor, the voltage generating unit may generate the first output value, which is a difference between the magnitude of the voltage applied to the shunt resistor and the voltage of the battery, and may generate the second output value, which is the same value as the voltage of the battery.

[0010] In one embodiment, the voltage generating unit may generate the first output value, which is the same value as the voltage of the battery, and may generate the second output value, which is the difference between the magnitude of the voltage applied to the shunt resistor and the voltage of the battery when a discharge overcurrent flows through the shunt resistor.

[0011] In one embodiment, the power supply may further include a determination unit that receives the first output value and the second output value and determines whether an overcurrent flows through the shunt resistor.

[0012] In one embodiment, the determination unit may include an amplifier that receives and amplifies the first output value and the second output value, a comparator that compares the output of the amplifier with a reference value, and a controller that determines whether a charging overcurrent or a discharging overcurrent flows through the shunt resistor based on the output of the amplifier or the comparator.

[0013] In one embodiment, the voltage generating unit may include a plurality of resistors and a plurality of switches, and the plurality of switches may be any one of an NPN-type BJT, a PNP-type BJT, and a MOSFET.

[0014] A battery management device according to an embodiment disclosed herein may include a shunt resistor connected to a battery, a first resistor connected to the shunt resistor at a first node, a second resistor connected to the first resistor at a second node, a third resistor connected to the shunt resistor at a third node, a fourth resistor connected to the third resistor at a fourth node, a first switch connected to the second resistor, a second switch connected to the fourth resistor, and a determination unit that receives a voltage at the second node and a voltage at the fourth node and determines whether an overcurrent flows through the shunt resistor.

[0015] In one embodiment, the determination unit may include an amplifier that receives the voltage at the second node and the voltage at the fourth node and amplifies the difference between them, a comparator that compares the output of the amplifier with a reference value, and a controller that determines whether a charging overcurrent or a discharging overcurrent flows through the shunt resistor based on the output of the amplifier or the comparator.

[0016] In one embodiment, the controller may control the first switch and the second switch, and may short-circuit the first switch and open the second switch to detect a charging overcurrent, and may open the first switch and short-circuit the second switch to detect a discharging overcurrent.

[0017] In one embodiment, the controller may open both the first switch and the second switch when the battery is in a charging or discharging state.

[0018] In one embodiment, the power supply may further include a relay coupled to the shunt resistor, the relay may be controlled in response to a control signal from the controller, and the controller may open the relay when the first switch or the second switch is short-circuited.

[0019] In one embodiment, the first switch and the second switch may be one of a PNP type BJT, an NPN type BJT, and a MOSFET.

[0020] In one embodiment, the magnitudes of the first resistor and the second resistor may be set such that a difference between a voltage of the second node and a voltage of the battery corresponds to a voltage applied to the shunt resistor when an overcurrent flows during a charging process of the battery, and the third resistor and the fourth resistor may be set such that a difference between a voltage of the fourth node and a voltage of the battery corresponds to a voltage applied to the shunt resistor when an overcurrent flows during a discharging process of the battery. [Effects of the Invention]

[0021] A battery management device according to an embodiment disclosed herein can diagnose the operation of the battery's overcurrent detection function. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 illustrates a battery pack according to one embodiment disclosed herein. [Figure 2] FIG. 1 illustrates a battery management device according to an embodiment disclosed herein. [Figure 3] FIG. 1 illustrates a battery management device according to an embodiment disclosed herein. [Figure 4]2 is a diagram for specifically explaining a voltage generating unit in a battery management device according to an embodiment disclosed herein; FIG. [Figure 5] 1 is a diagram illustrating a determination unit in a battery management device according to an embodiment disclosed herein; DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, the embodiments disclosed herein will be described in detail with reference to the accompanying drawings. When assigning reference numerals to components in each drawing, care should be taken to assign the same numerals to identical components even if they appear in different drawings. Furthermore, when describing the embodiments disclosed herein, if a detailed description of related known structures or functions is deemed to hinder understanding of the embodiments disclosed herein, such detailed description will be omitted.

[0024] When describing components of the embodiments disclosed herein, terms such as "first," "second," "A," "B," "(a)," and "(b)" may be used. These terms are used to distinguish a component from other components and do not limit the nature, order, or sequence of the components. Furthermore, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiments disclosed herein pertain. Terms similar to those defined in commonly used dictionaries should be interpreted as meanings consistent with the meanings they have in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly defined in this application.

[0025] FIG. 1 is a diagram illustrating a battery pack according to one embodiment disclosed herein.

[0026] Referring to FIG. 1 , a battery pack 10 according to an embodiment disclosed herein may include a battery module 100 , a battery management unit 200 , and a relay 300 .

[0027] The battery module 100 may include a plurality of battery cells 110, 120, 130, and 140. Although FIG. 1 illustrates a case in which the number of battery cells is four, the number of battery cells is not limited thereto, and the battery module 100 may include n (n is a natural number equal to or greater than two) battery cells. The battery module 100 may supply power to a target device (not shown). To this end, the battery module 100 may be electrically connected to the target device. Here, the target device may include an electrical, electronic, or mechanical device that operates by receiving power from a battery pack 10 including the plurality of battery cells 110, 120, 130, and 140. For example, the target device may be, but is not limited to, an electric vehicle (EV).

[0028] The plurality of battery cells 110, 120, 130, 140 may be, but are not limited to, lithium ion (Li-ion) batteries, lithium ion polymer (Li-ion) batteries, nickel cadmium (Ni-Cd) batteries, nickel metal hydride (Ni-MH) batteries, etc. Meanwhile, although FIG. 1 illustrates a case where there is one battery module 100, depending on the embodiment, there may be a plurality of battery modules 100.

[0029] The battery management device 200 can manage and / or control the state and / or operation of the battery module 100. For example, the battery management device 200 can manage and / or control the state and / or operation of the plurality of battery cells 110, 120, 130, 140 included in the battery module 100. The battery management device 200 can manage the charging and / or discharging of the battery module 100.

[0030] In addition, the battery management unit 200 may monitor the voltage, current, temperature, insulation resistance, etc. of the battery pack 10, the battery module 100, and / or each of the plurality of battery cells 110, 120, 130, and 140 included in the battery module 100. For monitoring by the battery management unit 200, sensors and various measurement modules (not shown) may be further installed at any position in the charge / discharge path or the battery module 100. The battery management unit 200 may calculate parameters indicating the state of the battery module 100, such as a state of charge (SOC) and a state of health (SOH), based on the measured values ​​of the monitored voltage, current, temperature, etc.

[0031] The battery management unit 200 may control the operation of the relay 300. For example, the battery management unit 200 may short-circuit the relay 300 to supply power to a target device. Furthermore, the battery management unit 200 may short-circuit the relay 300 when a charging device is connected to the battery pack 10.

[0032] The battery management system 200 can diagnose whether an overcurrent detection function is operating normally. To this end, the battery management system 200 can detect whether an overcurrent flows through the battery module 100 when the battery module 100 is charged or discharged. The battery management system 200 can open the relay 300 when an overcurrent is detected in the battery module 100. Thus, the battery management system 200 can check whether the overcurrent detection function is operating normally, thereby improving the ISO 26262 and ASIL safety grades.

[0033] Hereinafter, a specific operation of the battery management unit 200 will be described with reference to FIGS.

[0034] 2 and 3 are diagrams illustrating a battery management device according to one embodiment disclosed herein.

[0035] Referring to FIG. 2, a battery management device 200 according to an embodiment disclosed herein may include a shunt resistor 210 and a voltage generator 220.

[0036] The shunt resistor 210 may sense the current flowing through the circuit. For example, the magnitude of the current flowing through the circuit may be sensed by measuring a voltage applied to the shunt resistor 210 according to the current flowing through the circuit. The shunt resistor 210 may be connected to the battery module 100.

[0037] The voltage generator 220 may generate a first output value and a second output value. The voltage generator 220 may be connected to both ends of the shunt resistor 210. The voltage generator 220 may generate a first output value and a second output value having a difference corresponding to the magnitude of the voltage applied to the shunt resistor 210 when a charging overcurrent or a discharging overcurrent flows through the shunt resistor 210. That is, the difference between the first output value and the second output value may correspond to the magnitude of the voltage applied to the shunt resistor 210 when a charging overcurrent or a discharging overcurrent flows through the shunt resistor 210.

[0038] According to the embodiment, the voltage generator 220 may generate the first output value and the second output value in a state where no charging overcurrent or discharging overcurrent flows through the shunt resistor 210. For example, the battery management unit 200 may diagnose the charging overcurrent or discharging overcurrent detection function based on the first output value and the second output value generated in a state where no charging overcurrent or discharging overcurrent flows through the shunt resistor 210.

[0039] Here, the charging overcurrent may be defined as an overcurrent flowing in the battery module 100, a circuit connected to the battery module 100, and / or a device connected to the battery module 100 during a charging process of the battery module 100. Also, the discharging overcurrent may be defined as an overcurrent flowing in the battery module 100, a circuit connected to the battery module 100, and / or a device connected to the battery module 100 during a discharging process of the battery module 100. For example, in the battery management device 200, the levels of the charging overcurrent and the discharging overcurrent may be preset values.

[0040] According to the embodiment, the voltage generator 220 may generate a first output value that is a difference between the voltage applied to the shunt resistor 210 and the voltage of the battery when a charging overcurrent flows through the shunt resistor 210. For example, the voltage generator 220 may generate a first output value that is smaller than the voltage of the battery module 100 by the voltage applied to the shunt resistor 210 when a charging overcurrent flows through the shunt resistor 210. That is, the first output value may have a value obtained by subtracting the voltage applied to the shunt resistor 210 when a charging overcurrent flows through the shunt resistor 210 from the voltage of the battery module 100. Furthermore, the voltage generator 220 may generate a second output value that is the same as the voltage of the battery. For example, the voltage generator 220 may generate a second output value that has a magnitude corresponding to the voltage of the battery module 100.

[0041] The battery management unit 200 can detect a charging overcurrent based on the first output value and the second output value generated by the voltage generator 220.

[0042] According to the embodiment, the voltage generator 220 may generate a second output value that is the same as the battery voltage. For example, the voltage generator 220 may generate a first output value having a magnitude corresponding to the voltage of the battery module 100. Furthermore, the voltage generator 220 may generate a second output value that is a difference between the voltage applied to the shunt resistor 210 and the voltage of the battery when a discharge overcurrent flows through the shunt resistor 210. For example, the voltage generator 220 may generate a second output value that is smaller than the voltage of the battery module 100 by the magnitude of the voltage applied to the shunt resistor 210 when a discharge overcurrent flows through the shunt resistor 210. That is, the second output value may have a value obtained by subtracting the magnitude of the voltage applied to the shunt resistor 210 when a discharge overcurrent flows through the shunt resistor 210 from the voltage of the battery module 100.

[0043] The battery management unit 200 can detect a discharge overcurrent based on the first output value and the second output value generated by the voltage generator 220.

[0044] Meanwhile, according to an embodiment, the voltage generator 220 may be implemented with a plurality of resistors and a plurality of switches. For example, the plurality of switches may be any one of NPN-type BJTs, PNP-type BJTs, and MOSFETs.

[0045] Referring to FIG. 3, the battery management device according to an embodiment disclosed herein may further include a determination unit 230 in addition to the shunt resistor 210 and the voltage generation unit 220 described above.

[0046] The determination unit 230 may determine whether an overcurrent flows through the shunt resistor 210 based on the first output value and the second output value generated by the voltage generation unit 220. That is, the voltage generation unit 220 may generate a first output value and a second output value corresponding to a voltage applied when a charging overcurrent or a discharging overcurrent flows through the shunt resistor 210 in a state where a charging overcurrent or a discharging overcurrent does not directly flow through the shunt resistor 210, and the determination unit 230 may determine whether an overcurrent flows through the shunt resistor 210 by receiving the generated first output value and the second output value.

[0047] Therefore, it can be determined whether the determination unit 230 is properly performing the overcurrent detection function. For example, if the determination unit 230 does not determine that an overcurrent flows through the shunt resistor 210 even when the first output value and the second output value are input from the voltage generation unit 220, it can be determined that the determination unit 230 is not properly performing the overcurrent detection function.

[0048] Hereinafter, the voltage generating unit 220 in the battery management unit 200 will be specifically described with reference to FIG.

[0049] FIG. 4 is a diagram for specifically explaining a voltage generating unit in a battery management device according to an embodiment disclosed herein.

[0050] Referring to FIG. 4, a voltage generator 220 according to an embodiment disclosed herein may include a plurality of resistors 221 and a plurality of switches 222.

[0051] A plurality of resistors R1, R2, R3, and R4 (221) may be connected to both ends of the shunt resistor 210. Specifically, the first resistor R1 may be connected to the shunt resistor 210 at a first node N1. The second resistor R2 may be connected to the first resistor R1 at a second node N2. The third resistor R3 may be connected to the shunt resistor 210 at a third node N3. The fourth resistor R4 may be connected to the third resistor R3 at a fourth node N4.

[0052] The values ​​of the plurality of resistors 221 may be set so that the voltage of the battery module 100 is distributed based on the level of the charging overcurrent and the discharging overcurrent.

[0053] For example, the magnitudes of the first resistor R1 and the second resistor R2 may be set such that a difference between the magnitude of the voltage applied to the second node N2 and the magnitude of the voltage of the battery module 100 corresponds to a magnitude of the voltage applied to the shunt resistor 210 when a charging overcurrent flows through the shunt resistor 210. In addition, the magnitudes of the third resistor R3 and the fourth resistor R4 may be set such that a difference between the magnitude of the voltage applied to the fourth node N4 and the magnitude of the voltage of the battery module 100 corresponds to a magnitude of the voltage applied to the shunt resistor 210 when a discharging overcurrent flows through the shunt resistor 210.

[0054] 4, the plurality of resistors 221 includes, but is not limited to, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. For example, at least one of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 may be composed of a plurality of resistors.

[0055] The plurality of switches SW1, SW2, and 222 may be respectively coupled to the plurality of resistors 221. Specifically, the first switch SW1 may be coupled to the second resistor R2, and the second switch SW2 may be coupled to the fourth resistor R4.

[0056] On the other hand, the plurality of switches 222 may be any one of a PNP type BJT, an NPN type BJT, and a MOSFET. For example, the plurality of switches 222 may be a PNP type BJT.

[0057] The multiple switches 222 may be controlled by control signals Scmd1 and Scmd2. For example, the first switch SW1 may be controlled by the first control signal Scmd1, and the second switch SW2 may be controlled by the second control signal Scmd2. The control signals Scmd1 and Scmd2 may be generated by the controller 233 (see FIG. 5). However, this is not a limitation, and a first controller and a second controller may be present and may generate the first control signal Scmd1 and the second control signal Scmd2 to control the first switch SW1 and the second switch SW2, respectively.

[0058] The controller 233 may short-circuit the first switch SW1 and open the second switch SW2 to detect a charging overcurrent, and may short-circuit the second switch SW2 and open the first switch SW1 to detect a discharging overcurrent.

[0059] When the battery module 100 is charged or discharged, the first switch SW1 and the second switch SW2 may be opened by the control signals Scmd1 and Scmd2. When the first switch SW1 and the second switch SW2 are opened, the voltage of the first node N1 is applied to the second node N2, the voltage of the third node N3 is applied to the fourth node N4, and the magnitude of the voltage applied across the shunt resistor 210 may be input to the determination unit 230. That is, the determination unit 230 may determine whether a charging overcurrent or a discharging overcurrent flows through the shunt resistor 210 when the battery module 100 is charged or discharged.

[0060] The determination unit 230 receives the voltages applied to the second node N2 and the fourth node N4 and, based on the voltages, determines whether a charging overcurrent or a discharging overcurrent flows through the shunt resistor 210. That is, the battery management unit 200 can diagnose whether the determination unit 230 operates normally based on the voltages distributed to the second node N2 and the fourth node N4 in a state where a charging overcurrent or a discharging overcurrent does not directly flow through the shunt resistor 210.

[0061] The determining unit 230 will be specifically described below with reference to FIG.

[0062] FIG. 5 is a diagram for explaining a determination unit in a battery management device according to an embodiment disclosed herein.

[0063] Referring to FIG. 5, in a battery management device 200 according to an embodiment disclosed herein, a determination unit 230 may include an amplifier 231, a comparator 232, and a controller 233.

[0064] The amplifier 231 may amplify the difference between the first output value and the second output value transmitted from the voltage generating unit 220. For example, the amplifier 231 may amplify the value obtained by subtracting the second output value from the first output value. The amplifier 231 may include an OP-AMP.

[0065] For example, the voltages applied to the second node N2 and the fourth node N4 may be input to the amplifier 231. In this case, the magnitude of the voltage at the second node N2 may correspond to the first output value described above, and the magnitude of the voltage at the fourth node N4 may correspond to the second output value described above.

[0066] The comparator 232 receives the output of the amplifier 231, compares it with a reference value, and outputs a comparison result. For example, by comparing the output of the amplifier 231 with the reference value, the comparator 232 can output a first value if the output of the amplifier 231 is greater than the reference value, and output a second value if the output of the amplifier 231 is smaller than the reference value. Here, the reference value may be set to be the same or different when detecting a charging overcurrent and when detecting a discharging overcurrent.

[0067] The controller 233 can receive an output from the amplifier 231 and convert it into a digital signal, and can compare the converted digital signal with a preset value to determine whether a charging overcurrent or a discharging overcurrent flows through the shunt resistor 210. When both the first switch SW1 and the second switch SW2 are open, the controller 233 can determine whether a charging overcurrent or a discharging overcurrent flows through the shunt resistor 210 based on the output of the amplifier 231. For example, the controller 233 can be embodied as a microcontroller or an ADC (Analog to Digital Converter) to which the output from the amplifier 231 is input.

[0068] Furthermore, the controller 233 can determine whether a charging overcurrent or a discharging overcurrent flows through the shunt resistor 210 based on the comparison result output from the comparator 232. For example, when the comparison result has a first value, the controller 233 can determine that a charging overcurrent flows through the shunt resistor 210. That is, when the first switch SW1 or the second switch SW2 is short-circuited, the controller 233 can determine whether a charging overcurrent or a discharging overcurrent flows through the shunt resistor 210 based on the comparison result of the comparator 232.

[0069] Meanwhile, the controller 233 can generate control signals to control the plurality of switches 222. For example, the controller 233 can generate a first control signal Scmd1 to control the first switch SW1 and a second control signal Scmd2 to control the second switch SW2.

[0070] As a result, the controller 233 can diagnose whether the amplifier 231 and the comparator 232 operate normally when no overcurrent flows through the shunt resistor 210, based on the first output value and the second output value input from the voltage generator 220. That is, the battery management unit 200 can notify the user when the charging overcurrent or discharging overcurrent detection function does not operate normally. Through this process, it can be diagnosed whether the determination unit 230 normally performs the overcurrent detection function.

[0071] On the other hand, when the battery module 100 is not in a state of being charged or discharged, the controller 233 may open the relay 300. For example, the controller 233 may generate a control signal that opens the relay 300.

[0072] With the relay 300 open, the controller 233 generates the control signals Scmd1 and Scmd2, and alternately shorts the first switch SW1 and the second switch SW2, thereby diagnosing whether the charging overcurrent detection function or the discharging overcurrent detection function is operating.

[0073] Hereinafter, based on the structure of the battery management unit 200 described above, the diagnosis of the overcurrent detection function operation among the overall operation of the circuit will be described.

[0074] As described above, the battery management system 200 according to an embodiment disclosed herein can diagnose the overcurrent detection function. When the battery module 100 is not being charged or discharged, the battery management system 200 can open the relay 300 and diagnose the charging overcurrent or discharging overcurrent detection function.

[0075] The battery management unit 200 can diagnose the charging overcurrent detection function. To diagnose the charging overcurrent detection function, the controller 233 generates a plurality of control signals Scmd1 and Scmd2 to short the first switch SW1 and open the second switch SW2. When the first switch SW1 is shorted, the voltage of the battery module 100 may be divided by the shunt resistor 210, the first resistor R1, and the second resistor R2, and the divided voltage may be applied to the second node N2. However, the voltage applied to the shunt resistor 210 may be significantly smaller than the voltages applied to the first resistor R1 and the second resistor R2. When the second switch SW2 is open, the voltage of the battery module 100 may be applied to the fourth node N4.

[0076] As described above, the magnitudes of the first resistor R1 and the second resistor R2 may be set such that the difference between the voltage applied to the second node N2 and the voltage of the battery module 100 corresponds to the magnitude of the voltage applied to the shunt resistor 210 when a charging overcurrent flows through the shunt resistor 210. The voltage applied to the second node N2 and the voltage applied to the fourth node N4 may be input to the amplifier 231, which may amplify the difference between the voltage applied to the second node N2 and the voltage applied to the fourth node N4, and the amplified voltage may be input to the comparator 232. The comparator 232 may compare the magnitude of the amplified voltage with a first reference value. The output of the comparator 232 is input to the controller 233, which may determine whether a charging overcurrent flows through the shunt resistor 210 based on the output of the comparator 232.

[0077] That is, the difference between the voltage applied to the second node N2 and the voltage applied to the fourth node N4 corresponds to the magnitude of the voltage applied to the shunt resistor 210 when a charging overcurrent flows through the shunt resistor 210, so the battery management unit 200 can diagnose the operation of the charging overcurrent detection function in a state where a charging overcurrent does not flow directly through the shunt resistor 210.

[0078] The battery management unit 200 can also diagnose the discharge overcurrent detection function. To diagnose the discharge overcurrent detection function, the controller 233 generates a plurality of control signals Scmd1 and Scmd2 to open the first switch SW1 and short the second switch SW2. When the second switch SW2 is shorted, the voltage of the battery module 100 may be divided by the third resistor R3 and the fourth resistor R4, and the divided voltage may be applied to the fourth node N4. When the first switch SW1 is open, the voltage of the battery module 100 may be applied to the second node N2.

[0079] As described above, the magnitudes of the third resistor R3 and the fourth resistor R4 may be set such that the difference between the voltage applied to the fourth node N4 and the voltage of the battery module 100 corresponds to the magnitude of the voltage applied to the shunt resistor 210 when a discharge overcurrent flows through the shunt resistor 210. The voltage applied to the second node N2 and the voltage applied to the fourth node N4 may be input to the amplifier 231, and the amplifier 231 may amplify the difference between the voltage applied to the second node N2 and the voltage applied to the fourth node N4. The amplified voltage may be input to the comparator 232 and compared with a second reference value. The output of the comparator 232 is input to the controller 233, and the controller 233 may determine whether a discharge overcurrent flows through the shunt resistor 210 based on the output of the comparator 232.

[0080] That is, the difference between the voltage applied to the second node N2 and the voltage applied to the fourth node N4 corresponds to the magnitude of the voltage applied to the shunt resistor 210 when a discharge overcurrent flows through the shunt resistor 210, so the battery management unit 200 can diagnose the operation of the discharge overcurrent detection function in a state where a discharge overcurrent does not flow directly through the shunt resistor 210.

[0081] As described above, the battery management system 200 can diagnose the operation of the charging overcurrent or discharging overcurrent detection function without a charging overcurrent or discharging overcurrent directly flowing through the shunt resistor 210. Therefore, the battery management system 200 can confirm the integrity of the overcurrent detection function.

[0082] The above description is merely an illustrative example of the technical ideas disclosed in this document, and various modifications and variations may be made by a person having ordinary knowledge in the technical field to which the embodiments disclosed in this document pertain, without departing from the essential characteristics of the embodiments disclosed in this document.

[0083] Therefore, the embodiments disclosed in this document are intended to illustrate, not limit, the technical ideas disclosed in this document, and such embodiments do not limit the scope of the technical ideas disclosed in this document. The scope of protection of the technical ideas disclosed in this document should be interpreted according to the scope of the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of rights of this document. [Item 1] a shunt resistor coupled to the battery; a voltage generating unit configured to generate a first output value and a second output value having a difference corresponding to the magnitude of a voltage applied to the shunt resistor; The difference between the first output value and the second output value is A battery management device that corresponds to the magnitude of a voltage applied to the shunt resistor when a charging overcurrent or a discharging overcurrent flows through the shunt resistor. [Item 2] The voltage generating unit 2. The battery management device according to claim 1, wherein the first output value and the second output value are generated in a state in which the charging overcurrent or the discharging overcurrent does not flow through the shunt resistor. [Item 3] The voltage generating unit 3. The battery management device according to claim 1, wherein when a charging overcurrent flows through the shunt resistor, the first output value is a value of the difference between the magnitude of the voltage applied to the shunt resistor and the voltage of the battery, and the second output value is a value equal to the voltage of the battery. [Item 4] The voltage generating unit 4. The battery management device according to any one of items 1 to 3, wherein the first output value is the same as the voltage of the battery, and when a discharge overcurrent flows through the shunt resistor, the battery management device generates the second output value which is the difference between the voltage applied to the shunt resistor and the voltage of the battery. [Item 5] a determination unit that receives the first output value and the second output value and determines whether a charging overcurrent or a discharging overcurrent flows through the shunt resistor; 5. The battery management device of any one of items 1 to 4, further comprising: [Item 6] The determination unit an amplifier that receives and amplifies the first output value and the second output value; a comparator for comparing the output of the amplifier with a reference value; and a controller that determines whether a charging overcurrent or a discharging overcurrent flows through the shunt resistor based on an output of the amplifier or the comparator. [Item 7] The voltage generating unit a plurality of resistors and a plurality of switches; 7. The battery management device of claim 1, wherein the plurality of switches include one of an NPN-type BJT, a PNP-type BJT, and a MOSFET. [Item 8] a shunt resistor coupled to the battery; a first resistor connected to the shunt resistor at a first node; a second resistor connected to the first resistor at a second node; a third resistor connected to the shunt resistor at a third node; a fourth resistor connected to the third resistor at a fourth node; a first switch connected to the second resistor; a second switch connected to the fourth resistor; a determination unit configured to receive the voltage at the second node and the voltage at the fourth node and determine whether an overcurrent flows through the shunt resistor. [Item 9] The determination unit an amplifier that receives the voltage at the second node and the voltage at the fourth node and amplifies the difference therebetween; a comparator for comparing the output of the amplifier with a reference value; and a controller that determines whether a charging overcurrent or a discharging overcurrent flows through the shunt resistor based on an output of the amplifier or the comparator. [Item 10] The controller Controlling the first switch and the second switch; to detect a charging overcurrent, the first switch is shorted and the second switch is opened; 10. The battery management device according to item 9, wherein the second switch is short-circuited and the first switch is opened upon detection of a discharge overcurrent. [Item 11] The controller 11. The battery management device according to item 9 or 10, wherein both the first switch and the second switch are opened when the battery is in a charging or discharging state. [Item 12] further comprising a relay coupled to the shunt resistor; the relay is controlled in response to a control signal from the controller; 12. The battery management device of any one of items 9 to 11, wherein the controller opens the relay when the first switch or the second switch is short-circuited. [Item 13] The first switch and the second switch 13. The battery management device of any one of items 8 to 12, comprising any one of a PNP-type BJT, an NPN-type BJT, and a MOSFET. [Item 14] the magnitudes of the first resistor and the second resistor are set so that a difference between a voltage magnitude of the second node and a voltage magnitude of the battery corresponds to a voltage magnitude applied to the shunt resistor when an overcurrent flows during charging of the battery; 14. The battery management device according to any one of items 8 to 13, wherein the magnitudes of the third resistor and the fourth resistor are set so that a difference between the voltage of the fourth node and the voltage of the battery corresponds to the magnitude of the voltage applied to the shunt resistor when an overcurrent flows during the discharge process of the battery.

Claims

1. A voltage generating device connected to a shunt resistor connected to a battery, the voltage generating device outputting a voltage for determining whether an overcurrent flows through the shunt resistor, a first circuit including a first resistor connected to the shunt resistor at a first node and a third resistor connected to the shunt resistor at a third node; a second circuit connected to the first circuit; outputting an output value of the second circuit to a determination device that determines whether an overcurrent flows through the shunt resistor; The second circuit is a second resistor connected to the first resistor at a second node; a fourth resistor connected to the third resistor at a fourth node; a first switch connected to the second resistor; a second switch coupled to the fourth resistor.

2. The first switch and the second switch 2. The voltage generating device according to claim 1, comprising one of a PNP-type BJT, an NPN-type BJT, and a MOSFET.

3. the magnitudes of the first resistor and the second resistor are set so that a difference between a voltage magnitude of the second node and a voltage magnitude of the battery corresponds to a voltage magnitude applied to the shunt resistor when an overcurrent flows during a charging process of the battery; 3. The voltage generating device of claim 1, wherein the magnitudes of the third resistor and the fourth resistor are set so that a difference between the voltage of the fourth node and the voltage of the battery corresponds to a magnitude of a voltage applied to the shunt resistor when an overcurrent flows during a discharge process of the battery.

4. The voltage generating device according to claim 1 , wherein at least one of the first resistor, the second resistor, the third resistor, and the fourth resistor is composed of a plurality of resistors.

5. A voltage generating device according to any one of claims 1 to 4; the shunt resistor; A battery management device comprising the determination device.

6. A battery management method using the voltage generating device according to any one of claims 1 to 4, comprising: shorting the first switch and opening the second switch; opening the first switch and shorting the second switch.

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