Battery current measurement device and method for measuring the same

Abstract

To provide a battery current measuring device and a method for measuring a battery current which minimize heat generation and increase of resistance by a current sensor by dispersion of currents and increase the accuracy of measuring currents.SOLUTION: The battery current measuring device includes: a first sensor unit connected to a battery for measuring a current; a second sensor unit connected to the first sensor unit for measuring a current; a switch unit connected to the second sensor unit for switching the connection of the second sensor unit; and a processor for calculating the current of the battery on the basis of a first current value of the first sensor unit and a second current value of the second sensor unit, calculating a charge state (SOC) accordingly, comparing the first current value and the second current value, and detecting a failure current sensor of a plurality of current sensors in the first sensor unit and in the second sensor unit.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a battery current measuring device and method that is connected to a battery to measure current and detect sensor failure. [Background technology]

[0002] In recent years, there has been a trend for the use of batteries to be expanded not only to mobile devices such as mobile phones and tablet PCs, but also to areas such as electrically powered vehicles (EV, HEV, PHEV) and large-capacity energy storage systems (ESS).

[0003] A battery generates heat when it is charged and discharged. A current sensor installed to measure the charging current and discharging current of a battery is affected by the heat generated in the battery cell because it is installed adjacent to the battery cell, which may increase measurement errors or cause failure.

[0004] As a result, there has been increasing interest in methods for accurately measuring the charging and discharging currents of such batteries and detecting failures of the current sensors.

[0005] Generally, a battery current measurement is designed in such a way that one sensor is responsible for the entire current range or a part of the range, and such a current measurement method can measure the current by applying an interpolation method of a line connecting two points.

[0006] However, this measurement method has a problem in that the accuracy of the measurement values ​​is not uniform over the entire current measurement area.

[0007] In addition, when using this measurement method, the current sensor may generate heat in the process of measuring a high current, and the accuracy of the measurement may decrease due to an increase in the internal resistance.

[0008] When a current sensor fails, it is difficult for the battery to distinguish between the failed current sensor and the current sensor that is operating normally, and it is necessary to replace the entire current sensor or check the measurement value one by one.

[0009] Related background art includes Korean Patent Publication No. 10-2021-0104457, entitled "Battery Device and Current Sensor Diagnosis Method." [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Korean Patent Publication No. 10-2021-0104457 Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention has been made in response to the above-mentioned needs, and an object of the present invention is to provide a battery current measuring device and method that minimizes heat generation and resistance increase in a current sensor due to current dispersion and improves the accuracy of current measurement. [Means for solving the problem]

[0012] In order to achieve the above object, a battery current measuring device according to one aspect of the present invention includes a first sensor unit connected to a battery and measuring a current; a second sensor unit connected to the first sensor unit and measuring a current; a switch unit connected to the second sensor unit and switching a connection to the second sensor unit; and a processor that calculates a current of the battery based on a first current value of the first sensor unit and a second current value of the second sensor unit, calculates a state of charge (SOC) corresponding to the current value, compares the first current value with the second current value, and detects a faulty current sensor among a plurality of current sensors included in the first sensor unit and the second sensor unit.

[0013] The processor compares the first current value and the second current value, and if the first current value and the second current value are determined to be identical within an error range, determines that the first sensor unit and the second sensor unit are operating normally, and if the first current value and the second current value are different, determines that a failure has occurred in one of the current sensors.

[0014] The second sensor unit includes a third current sensor, a fourth current sensor, and a fifth current sensor connected in parallel to each other, and the processor calculates the second current value by adding up current values ​​measured through the third current sensor to the fifth current sensor.

[0015] When the first current value and the second current value are different, the processor compares the third current value of the third current sensor, the fourth current value of the fourth current sensor, and the fifth current value of the fifth current sensor, and determines that the current sensor corresponding to a current value outside a set range is the faulty current sensor.

[0016] The switch unit includes a first switch connected in series with the third current sensor; a second switch connected in series with the fourth current sensor; and a third switch connected in series with the fifth current sensor, and any one of the first switch to the third switch is turned on or off in response to a control signal of the processor.

[0017] The processor controls the first switch to the third switch to be turned off sequentially when the first current value and the second current value are different, and detects the faulty current sensor by calculating the second current value from the current values ​​of two of the multiple current sensors of the second sensor unit in response to the operation of the switch unit and comparing it with the first current value.

[0018] The processor may determine that a first current sensor of the first sensor unit is faulty when it is determined that the third current sensor, the second current sensor, and the fifth current sensor are normal.

[0019] The processor may turn off one of the first to third switches connected to the fault current sensor, and disconnect the fault current sensor.

[0020] A battery current measuring method according to one aspect of the present invention includes a step of measuring a current with a first sensor unit connected to a battery; a step of measuring a current with a second sensor unit connected to the first sensor unit; a step of a processor comparing a first current value of the first sensor unit with a second current value of the second sensor unit and detecting a fault current sensor among a plurality of current sensors included in the first sensor unit and the second sensor unit; a step of the processor controlling a switch unit to disconnect the fault current sensor; and a step of the processor calculating a current of the battery based on the first current value and the second current value, and calculating a state of charge (SOC) corresponding to the calculated current.

[0021] In the step of measuring a current by a second sensor unit connected to the first sensor unit, the processor may calculate the second current value by adding up current values ​​of third to fifth current sensors included in the second sensor unit and connected in parallel.

[0022] The step of detecting the fault current sensor includes a step of the processor comparing a first current value with a second current value; determining that the first sensor unit and the second sensor unit are operating normally if the first current value and the second current value are identical within an error range; and determining that one of the current sensors included in the first sensor unit and the second sensor unit is the fault current sensor if the first current value and the second current value are different.

[0023] The step of detecting the fault current sensor further includes a step of determining that a corresponding current sensor is the fault current sensor when a current value deviating from a set range is input from each of the third to fifth current sensors of the second sensor unit.

[0024] The step of detecting the faulty current sensor further includes the steps of: sequentially turning off first to third switches included in the switch unit and disconnecting the current sensor connected to each switch; calculating the second current value from current values ​​measured from two normally connected current sensors and comparing the second current value with the first current value; controlling the next switch if the first current value and the second current value are different; and determining the disconnected current sensor as the faulty current sensor if the first current value and the second current value are the same.

[0025] The step of detecting the fault current sensor further includes the step of determining that the first current sensor of the first sensor unit is the fault current sensor when it is determined that the modes of the multiple current sensors of the second sensor unit are operating normally.

[0026] The step of disconnecting the fault current sensor includes the step of turning off a switch connected to the fault current sensor among first to third switches included in the switch unit, to disconnect the fault current sensor. Effect of the Invention

[0027] According to one aspect of the present invention, a battery current measuring device and method of the present invention can reduce heat generation by dispersing current even at a high limit current, thereby reducing measurement errors due to temperature.

[0028] Advantageous Effects of Invention According to one aspect of the present invention, an apparatus and method for measuring a battery current can improve the accuracy of current measurement.

[0029] A battery current measuring device and method according to one aspect of the present invention can easily detect a fault using a plurality of current sensors connected in parallel, and can easily identify the current sensor where a fault has occurred. [Brief description of the drawings]

[0030] [Figure 1] 1 is a block diagram showing a simplified configuration of a battery pack including a current measuring device according to an embodiment of the present invention; [Diagram 2] 1 is a diagram showing a connection configuration of a battery pack including a current measuring device according to an embodiment of the present invention. [Diagram 3] 1 is a diagram showing a configuration of a current measuring device according to an embodiment of the present invention. [Figure 4] 4 is a flowchart illustrating a battery current measurement and fault detection method of the current measurement device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] The present invention will now be described with reference to the accompanying drawings.

[0032] In this process, the thickness of each line and the size of each component shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, each term described below is defined in consideration of the function of the present invention, and may vary depending on the intention or practice of a user or operator. Therefore, these terms should be defined based on the contents of this specification as a whole.

[0033] FIG. 1 is a block diagram showing a simplified configuration of a battery pack including a current measuring device according to an embodiment of the present invention.

[0034] As shown in FIG. 1, the current measuring device is connected to a battery 190 and is included in a battery pack 100 , and includes a first sensor unit 140 , a second sensor unit 150 , a switch unit 160 and a processor 110 .

[0035] The battery 190 is charged by a supplied charging current and can output the charged current. The battery 190 can include a plurality of battery cells.

[0036] The first sensor unit 140 is connected to the battery 190, senses a current output from the battery 190, and applies the sensed current to the processor 110. The first sensor unit 140 may include at least one current sensor.

[0037] The second sensor unit 150 is connected to the first sensor unit 140 and senses the current of the battery 190. The second sensor unit 150 may include a plurality of current sensors.

[0038] The switch unit 160 is connected to the second sensor unit 150 and switches the connection of the second sensor unit 150. The switch unit 160 switches the connection to at least one of the multiple current sensors included in the second sensor unit 150 in response to a control command from the processor 110.

[0039] The processor 110 calculates the state of charge (SOC) of the battery 190 based on the current values ​​input from the first sensor unit 140 and the second sensor unit 150.

[0040] A battery management system (BMS) or a main control unit (MCU) may be used as the processor 110. The processor 110 may include a memory or a buffer.

[0041] The processor 110 can detect a malfunction by comparing the current values ​​of the first sensor unit 140 and the second sensor unit 150. The processor 110 can detect a malfunction of the current sensor by comparing the first current value of the first sensor unit 140 and the second current value of the second sensor unit 150 and determining whether the two values ​​are the same.

[0042] When it is determined that a fault has occurred in any one of the current sensors, the processor 110 controls the switch unit 160 to detect the faulty current sensor and applies a control signal to the switch unit 160 to disconnect the faulty current sensor.

[0043] The processor 110 removes the faulty current sensor by disconnecting the faulty current sensor, allowing the current to be measured.

[0044] The processor 110 can generate an alert upon failure of at least one of the current sensors.

[0045] As a result, the current measuring device can eliminate a faulty current sensor and accurately measure the current to the battery 190 through a current sensor that operates normally.

[0046] FIG. 2 is a diagram showing a connection configuration of a battery pack including a current measuring device according to an embodiment of the present invention.

[0047] 2, the current measuring device includes a first terminal 11 connected to a positive terminal of a battery 190 and a second terminal 12 connected to a negative terminal of the battery 190. The current measuring device also includes a third terminal 21 connected to the first terminal 11 and a fourth terminal 22 connected to the second terminal 12.

[0048] The first terminal 11 is connected to a first connector (DC connector) 181 and a first micro switch (Micro SW) 171 to be connected to the third terminal 21 .

[0049] The second terminal 12 is connected to the first sensor unit 140, the second sensor unit 150, and the switch unit 160. In addition, the second terminal 12 is connected to the fourth terminal 22 through a second micro switch (Micro SW) connected to the switch unit 160 and a second connector (DC Connector) 182.

[0050] The first sensor unit 140 has one end connected to the second terminal 12 and the other end connected to the second sensor unit 150. The second sensor unit 150 is connected to the first sensor unit 140 in series.

[0051] The switch unit 160 may be connected in series with the second sensor unit 150 .

[0052] The switch unit 160 may include a plurality of switches each connected in series to a corresponding one of the current sensors included in the second sensor unit 150 .

[0053] When the processor 110 charges the battery 190 or outputs a discharge current, it can operate in either a charging mode or a discharging mode by correspondingly controlling the first connector 181, the second connector 182 and the first microswitch 171 and the second microswitch 172.

[0054] The processor 110 is connected to the first sensor unit 140 and the second sensor unit 150, and can control the switch unit 160 according to the measured current value.

[0055] When a failure occurs in any one of the current sensors included in the first sensor unit 140 and the second sensor unit 150, the processor 110 may stop the charging mode or discharging mode of the battery 190 and set the inspection mode.

[0056] The processor 110 controls the switch unit 160 according to the measured current value, detects the current sensor where a fault has occurred, and controls the switch unit 160 to operate in the charging mode or discharging mode again after disconnecting the current sensor where a fault has occurred.

[0057] FIG. 3 is a diagram showing the configuration of a current measuring device according to an embodiment of the present invention.

[0058] As shown in FIG. 3, the current measurement device measures the current of the battery 190 and detects failure of the current sensor.

[0059] The first sensor unit 140 may include a first current sensor 141 .

[0060] Optionally, the first sensor unit 140 may further include a second current sensor (not shown). When the second current sensor is added, the second current sensor may be connected in parallel with the first current sensor 141.

[0061] The first current sensor 141 has both ends S11 and S12 connected to the processor 110 and applies a first current value to the processor 110.

[0062] The second sensor unit 150 may be connected in series with the first current sensor 141 .

[0063] The second sensor unit 150 may include a third current sensor 151, a fourth current sensor 152, and a fifth current sensor 153. Depending on the case, the second sensor unit 150 may further include a sixth current sensor (not shown).

[0064] The third current sensor 151 to the fifth current sensor 153 may be connected in parallel.

[0065] The third current sensor 151 has both ends S21 and S22 connected to the processor 110 and applies a third current value to the processor 110.

[0066] The fourth current sensor 152 has both ends S31 and S32 connected to the processor 110 and applies a fourth current value to the processor 110.

[0067] The fifth current sensor 153 has both ends S41 and S42 connected to the processor 110 and applies a fifth current value to the processor 110.

[0068] The processor 110 may add up the third current value, the fourth current value, and the fifth current value to calculate the second current value.

[0069] The switch unit 160 includes a plurality of switches connected in series to the current sensors of the second sensor unit 150 .

[0070] The switch unit 160 may include a first switch 161 , a second switch 162 and a third switch 163 .

[0071] The first switch 161 to the third switch 163 may be connected in parallel with each other.

[0072] When the second sensor unit 150 further includes a sixth current sensor, the switch unit 160 may further include a fourth switch connected to the sixth current sensor.

[0073] The first switch 161 is connected in series with the third current sensor 151 and can connect or disconnect the third current sensor 151 .

[0074] The second switch 162 is connected in series with the fourth current sensor 152 and can connect or disconnect the fourth current sensor 152 .

[0075] The third switch 163 is connected in series with the fifth current sensor 153 and can connect or disconnect the fifth current sensor 153 .

[0076] In the switch unit 160, the first switch 161 to the third switch 163 may be turned on or off by a control signal CS1 of the processor 110.

[0077] The processor 110 compares the first current value measured by the first current sensor 141 with a second current value obtained by adding up the current values ​​measured by the third current sensor 151 to the fifth current sensor 153 .

[0078] If the first current value and the second current value are the same within the error range, the processor 110 determines that the first current sensor 141 and the third current sensor 151 to the fifth current sensor 153 all operate normally.

[0079] At this time, the processor 110 applies the control signal CS1 so that the first switch 161 to the third switch 163 maintain the ON state.

[0080] Meanwhile, the processor 110 may determine that a failure has occurred in any one of the current sensors if there is a difference between the first current value and the second current value that is equal to or greater than a certain value.

[0081] At this time, the processor 110 can compare the current values ​​of the third current sensor 151 to the fifth current sensor 153 to determine which current sensor is faulty.

[0082] The processor 110 determines whether the third current value, the fourth current value, and the fifth current value are within the set range.

[0083] If at least one of the third current value, the fourth current value, and the fifth current value is different or outside a set range, the processor 110 can detect the current sensor in which the corresponding current value is measured as a faulty current sensor.

[0084] The processor 110 can also control a number of switches in the switch section 160 and detect a fault current sensor.

[0085] The processor 110 sequentially turns off the first switch 161 to the third switch 163, and can detect the fault current sensor through the sum of the two current values.

[0086] The processor 110 sequentially controls the first switch 161 to the third switch 163 of the switch unit 160 so that one of them is turned off (OFF).

[0087] When the first switch 161 is turned off, the processor 110 compares the first current value of the first current sensor 141 with a second current value which is the sum of the current values ​​of the fourth current sensor 152 and the fifth current sensor 153.

[0088] If the first current value and the second current value are the same, the processor 110 can determine that the third current sensor 151 is faulty.

[0089] On the other hand, if the first current value and the second current value are different, the processor 110 controls the switch unit 160 again.

[0090] The processor 110 can apply a control signal to turn the first switch 161 on and the second switch 162 off.

[0091] When the fourth current sensor 152 is disconnected through the second switch 162, the processor 110 compares the first current value of the first current sensor 141 with a second current value which is the sum of the current values ​​of the third current sensor 151 and the fifth current sensor 153.

[0092] The processor 110 may determine that the fourth current sensor 152 is a faulty current sensor if the first current value and the second current value are the same.

[0093] On the other hand, the processor 110 may control the third switch 163 when the first current value and the second current value are different.

[0094] The processor 110 may compare the first and second current values ​​measured in a state in which the fifth current sensor 153 is disconnected to detect a faulty current sensor.

[0095] On the other hand, when all of the current sensors of the second sensor unit 150 are normal, the processor 110 may determine that the first current sensor 141 is broken.

[0096] The processor 110 may apply a control signal CS1 to the switch unit 160 so that a switch connected to the fault current sensor is turned off.

[0097] Accordingly, the current measuring device can easily detect and remove the faulty current sensor by disconnecting the faulty current sensor, thereby improving the measurement accuracy.

[0098] In addition, the processor 110 can calculate the state of charge (SOC) of the battery 190 based on the current values ​​of the first sensor unit 140 and the second sensor unit 150 that are operating normally.

[0099] Meanwhile, the first sensor unit 140 further includes a second current sensor connected in parallel to the first current sensor 141, and a connected switch is added and selectively controlled to turn on and off to detect a fault current sensor.

[0100] Furthermore, the processor 110 can detect a failure of the current sensor based on the comparison result between the first current value and the second current value, as described above.

[0101] The processor 110 is connected to the second terminal 12 and receives the current value measured through the first sensor unit 140 and the second sensor unit 150 to determine the state of charge (SOC) of the battery 190 .

[0102] The processor 110 determines the current value of the battery 190 from the first current value of the first sensor unit 140 and the second current value of the second sensor unit 150 .

[0103] In addition, the processor 110 can detect failures of the current sensors included in the first sensor unit 140 and the second sensor unit 150 from the first current value of the first sensor unit 140 and the second current value of the second sensor unit 150.

[0104] FIG. 4 is a flowchart showing a battery current measurement and fault detection method of the current measurement device according to an embodiment of the present invention.

[0105] As shown in FIG. 4, a current measurement device determines the condition of the battery 190 and detects fault current sensors.

[0106] The first sensor unit 140 senses a first current value from the first current sensor 141 and applies it to the processor 110 (S310).

[0107] The processor 110 receives a first current value from the first current sensor 141 of the first sensor unit 140 .

[0108] The second sensor unit 150 senses current values ​​through the third current sensor 151 to the fifth current sensor 153 and applies the sensed current values ​​to the processor 110 (S320).

[0109] The third current sensor 151 can measure a third current value, the fourth current sensor 152 can measure a fourth current value, and the fifth current sensor 153 can measure a fifth current value.

[0110] The processor 110 compares the measured current with a reference current (S330), and if the measured current is smaller than the reference current, controls the switch unit 160 (S340) to turn off one of the switches and disconnect one of the current sensors (the nth current sensor) of the second sensor unit 150 (S350).

[0111] The processor 110 allows only some of the current sensors to measure the current because the current is small.

[0112] The processor 110 calculates a second current value which is the sum of the current values ​​of the second sensor parts 150 (S360).

[0113] The processor 110 adds up the current values ​​of the third current sensor 151 to the fifth current sensor 153 of the second sensor unit 150 to calculate a second current value.

[0114] The processor 110 compares the first current value with the second current value (S370).

[0115] If the first current value and the second current value are the same within the error range, the processor 110 determines that the multiple current sensors included in the first sensor unit 140 and the second sensor unit 150 are operating normally.

[0116] Furthermore, if the first current value of the first sensor unit 140 and the second current value of the second sensor unit 150 are different, the processor 110 determines that a failure has occurred in any one of the current sensors (S380).

[0117] The processor 110 checks the magnitudes of the third current value through the fifth current value of the third current sensor 151 through the fifth current sensor 153 of the second sensor unit 150, and detects a current value that deviates from a set range.

[0118] The processor 110 may determine that a failure has occurred in a current sensor corresponding to a current value outside a set range, and may sequentially turn off the first switch 161 to the third switch 163, and sequentially disconnect one of the third current sensor 151 to the fifth current sensor 153 of the second sensor unit 150.

[0119] The processor 110 can compare the sum of the two current sensors with the first current value, and detect the faulty current sensor according to the comparison result.

[0120] On the other hand, when all of the current sensors of the second sensor unit 150 are normal, the processor 110 may determine that the first current sensor 141 is broken.

[0121] If a fault current sensor is detected, the processor 110 controls the switch connected to the fault current sensor to be turned off (S390).

[0122] The switch section 160 turns off the Nth switch in response to the control signal.

[0123] Thereby, the fault current sensor is decoupled by turning off the coupled switch (S400).

[0124] After disconnecting the fault current sensor, the processor 110 calculates the current of the battery 190 corresponding to the first current value and the second current value, and calculates the state of charge (SOC) (S410).

[0125] The processor 110 can generate and transmit a warning to the outside when a faulty current sensor exists, while the processor 110 can turn off the operation of the current measuring device when the first current sensor is faulty.

[0126] Therefore, the battery current measuring device and method according to an aspect of the present invention can easily detect a faulty current sensor and disconnect it to accurately calculate the battery current and state of charge. In addition, the present invention can measure high current in a distributed manner through a plurality of current sensors.

[0127] The present invention has been described with reference to the embodiments shown in the drawings, but these are merely illustrative, and those skilled in the art will appreciate that various modifications and equivalent embodiments are possible. Therefore, the true technical scope of the present invention should be determined by the following claims. [Explanation of symbols]

[0128] 100 Battery Packs 110 Processor 140 First Sensor Section 141 First current sensor 150 Second Sensor Section 151~153 Current sensor 160 Switch section 161~163 Switch 171, 172 Microswitch 181, 182 Connectors

Claims

1. a first sensor portion connected to the battery and configured to measure a current; a second sensor unit connected to the first sensor unit and configured to measure a current; a switch unit connected to the second sensor unit and configured to switch the connection of the second sensor unit; and Calculating a current of the battery based on the first current value of the first sensor unit and the second current value of the second sensor unit, and calculating a state of charge (SOC) corresponding to the current of the battery; a processor that compares the first current value with the second current value and detects a faulty current sensor among a plurality of current sensors included in the first sensor unit and the second sensor unit.

2. the processor compares the first current value with the second current value, and when it is determined that the first current value and the second current value are the same within an error range, determines that the first sensor unit and the second sensor unit operate normally; The battery current measuring device according to claim 1 , wherein, when the first current value and the second current value are different, it is determined that a failure occurs in one of the current sensors.

3. the second sensor unit includes a third current sensor, a fourth current sensor, and a fifth current sensor connected in parallel to each other, The battery current measuring device according to claim 1 , wherein the processor calculates the second current value by adding up current values ​​measured through the third current sensor, the second current sensor, the third current sensor, the fifth current sensor, and the fifth current sensor.

4. 4. The battery current measuring device of claim 3, wherein when the first current value and the second current value are different, the processor compares a third current value of the third current sensor, a fourth current value of the fourth current sensor, and a fifth current value of the fifth current sensor, and determines that the current sensor corresponding to a current value outside a set range is the faulty current sensor.

5. The switch unit is a first switch connected in series with the third current sensor; a second switch coupled in series with the fourth current sensor; and a third switch connected in series with the fifth current sensor; The battery current measuring device according to claim 3, wherein any one of the first switch, the second switch, and the third switch is turned on or off in response to a control signal from the processor.

6. the processor controls the first switch to the third switch so as to be sequentially turned off when the first current value and the second current value are different; The battery current measuring device according to claim 5, characterized in that in response to the operation of the switch unit, the second current value is calculated from the current values ​​of two of the multiple current sensors of the second sensor unit, and the faulty current sensor is detected by comparing the second current value with the first current value.

7. 7. The battery current measuring device according to claim 6, wherein the processor determines that the first current sensor of the first sensor unit is faulty when the third current sensor, the second current sensor, the third current sensor, the third current sensor, and the fifth current sensor are determined to be normal.

8. 6. The battery current measuring device of claim 5, wherein the processor turns off one of the first switch to the third switch that is connected to the fault current sensor, to disconnect the fault current sensor.

9. a first sensor unit connected to the battery measuring a current; a second sensor unit connected to the first sensor unit measuring a current; a processor comparing a first current value of the first sensor unit with a second current value of the second sensor unit to detect a faulty current sensor among a plurality of current sensors included in the first sensor unit and the second sensor unit; The processor controls a switch unit to disconnect the fault current sensor; and the processor calculating a current of the battery based on the first current value and the second current value, and correspondingly calculating a state of charge (SOC).

10. In the step of measuring a current by the second sensor unit connected to the first sensor unit, 10. The method of claim 9, wherein the processor calculates the second current value by summing current values ​​of third to fifth current sensors included in the second sensor unit and connected in parallel.

11. Detecting the fault current sensor comprises: the processor comparing the first current value to the second current value; determining that the first sensor unit and the second sensor unit are operating normally if the first current value and the second current value are equal within an error range; and 10. The method of claim 9, further comprising: determining, when the first current value and the second current value are different, that one of the current sensors included in the first sensor unit and the second sensor unit is the fault current sensor.

12. Detecting the fault current sensor comprises:

12. The method of claim 11, further comprising: when a current value deviating from a set range is input from each of the third to fifth current sensors of the second sensor unit, determining that the corresponding current sensor is the faulty current sensor.

13. Detecting the fault current sensor comprises: sequentially turning off first to third switches included in the switch unit and disconnecting current sensors connected to each switch; calculating the second current value from current values ​​measured from the two normally connected current sensors and comparing the second current value with the first current value; controlling a next switch if the first current value and the second current value are different; and The method of claim 11, further comprising: determining the disconnected current sensor as the fault current sensor if the first current value and the second current value are equal.

14. Detecting the fault current sensor comprises:

12. The method of claim 11, further comprising: determining that a first current sensor of the first sensor unit is the faulty current sensor when it is determined that the plurality of current sensors of the second sensor unit are operating normally.

15. The step of disconnecting the fault current sensor includes:

10. The method of claim 9, further comprising: turning off a switch connected to the fault current sensor among first to third switches included in the switch unit, to disconnect the fault current sensor.

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