WO2023132502A1 - 외부 단락 진단 방법 및 이를 적용한 배터리 시스템 - Google Patents
외부 단락 진단 방법 및 이를 적용한 배터리 시스템 Download PDFInfo
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- WO2023132502A1 WO2023132502A1 PCT/KR2022/020237 KR2022020237W WO2023132502A1 WO 2023132502 A1 WO2023132502 A1 WO 2023132502A1 KR 2022020237 W KR2022020237 W KR 2022020237W WO 2023132502 A1 WO2023132502 A1 WO 2023132502A1
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- Prior art keywords
- voltage
- battery
- main relay
- battery pack
- external short
- Prior art date
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- 238000003745 diagnosis Methods 0.000 title claims description 19
- 238000000034 method Methods 0.000 title claims description 16
- 101001074602 Homo sapiens Protein PIMREG Proteins 0.000 description 5
- 101100330288 Oryza sativa subsp. japonica RCS3 gene Proteins 0.000 description 5
- 102100036258 Protein PIMREG Human genes 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0038—Circuits for comparing several input signals and for indicating the result of this comparison, e.g. equal, different, greater, smaller (comparing pulses or pulse trains according to amplitude)
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/10—Measuring sum, difference or ratio
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
Definitions
- the present disclosure relates to a method for diagnosing an external short circuit and a battery system to which the same is applied.
- a method for diagnosing an external short circuit of a high voltage battery pack uses a current flowing in a pre-charging path during pre-charging of the high voltage battery pack.
- a battery management system of a high voltage battery measures a current flowing in a link wire between a high voltage battery pack and an external device during precharging of the high voltage battery.
- the battery management system protects high-voltage batteries from external short circuits by cutting off the connection between the battery pack and external devices when the measured current exceeds a threshold.
- An external short circuit diagnosis method capable of diagnosing an external short circuit without damaging elements constituting the battery system and a battery system using the same are provided.
- a battery system includes a battery pack including a plurality of battery cells, a first main relay including one end connected to a positive electrode of the battery pack, and one end connected to a negative electrode of the battery pack. closes a second main relay, a first link wire connected to the other end of the first main relay, a second link wire connected to the other end of the second main relay, and the first main relay, and the battery pack and a battery management system that measures a positive voltage of the battery pack and a negative link voltage of the second link wire, and determines an external short circuit when the voltage difference between the positive voltage of the battery pack and the negative link voltage is less than a predetermined reference voltage.
- the battery management system may determine an external short circuit when a voltage obtained by subtracting the negative link voltage from the positive voltage of the battery pack is less than the reference voltage.
- the battery management system may generate the reference voltage by multiplying the positive electrode voltage of the battery pack by a predetermined ratio.
- the battery management system may close the first main relay and open the second main relay during a predetermined diagnosis period for determining an external short circuit.
- the battery system further includes a precharge relay connected in parallel to the first main relay, and the battery management system closes the first main relay during a predetermined diagnosis period for determining an external short circuit;
- the precharge relay may be opened.
- a battery system includes a first main relay including one end connected to a positive electrode of a battery pack including a plurality of battery cells, a second main relay including one end connected to a negative electrode of the battery pack, and a battery management system.
- the method for diagnosing an external short circuit of a battery system performed by the battery management system includes the step of closing the first main relay during a diagnosis period, the positive voltage of the battery pack and the second link wiring. measuring the negative link voltage of the battery pack, comparing the voltage difference between the positive link voltage of the battery pack and the negative link voltage with a predetermined reference voltage, and determining an external short circuit when the voltage difference is smaller than the reference voltage.
- Comparing the voltage difference with a predetermined reference voltage may include comparing whether a voltage obtained by subtracting the negative link voltage from the positive voltage of the battery pack is less than the reference voltage.
- the method for diagnosing an external short circuit of the battery system may further include generating the reference voltage by multiplying a positive electrode voltage of the battery pack by a predetermined ratio.
- the method of diagnosing an external short circuit of the battery system may further include opening the second main relay during the diagnosis period.
- the method of diagnosing an external short circuit of the battery system may further include opening a precharge relay connected in parallel to the first main relay during the diagnosis period.
- the present invention provides a method for diagnosing an external short circuit capable of diagnosing an external short circuit without damaging elements constituting the battery system and a battery system to which the same is applied.
- FIG. 1 is a diagram illustrating a battery system according to an exemplary embodiment.
- FIG. 2 is a diagram when an external short circuit occurs in a battery system according to an exemplary embodiment.
- FIG. 3 is a flowchart illustrating a method for diagnosing an external short circuit according to an exemplary embodiment.
- FIG. 1 is a diagram illustrating a battery system according to an exemplary embodiment.
- the battery system 1 includes a battery pack 10, a battery management system (BMS) 20, a first main relay 31, a second main relay 32, and a precharge relay 33. ), a precharge resistor 34, a current sensor 50, and a link capacitor 60.
- BMS battery management system
- the battery system 1 includes a battery pack 10, a battery management system (BMS) 20, a first main relay 31, a second main relay 32, and a precharge relay 33. ), a precharge resistor 34, a current sensor 50, and a link capacitor 60.
- the external power device 2 may be a load receiving power from the battery system 1 or a charger for charging the battery system 1 .
- the external power device 2 may include at least one of an inverter, a DC-DC converter, a motor, an electronic control circuit, an on board charger (OBC), and a fast charger of a vehicle including the battery system 1. there is.
- OBC on board charger
- the battery pack 10 includes a plurality of battery cells 10_1-10_n connected in series. n may be a natural number of 2 or greater. Although one battery pack 10 is shown in FIG. 1 , the battery system 1 may include a plurality of battery packs connected in series, parallel, or series-parallel.
- the current sensor 50 may sense current (hereinafter referred to as battery pack current) flowing through the battery pack 10 and transmit a signal indicating the sensed current to the BMS 20 .
- Link capacitor 60 is connected between the two output terminals (P+, P-) of the battery system (1).
- the BMS 20 may manage the operation of the battery pack 10 .
- the BMS 20 is connected to the plurality of battery cells 10_1 to 10_n, measures cell voltages of the plurality of battery cells 10_1 to 10_n, and measures battery pack current and temperature of the battery pack 10. Receives the information of the plurality of battery cells (10_1-10_n), controls the charging and discharging of the battery pack 10 based on the plurality of cell voltages, battery pack current, temperature, etc. of the plurality of battery cells (10_1-10_n), the plurality of battery cells (10_1-10_n) It is possible to control the cell balancing operation for
- the first main relay 31 , the second main relay 32 , and the precharge relay 33 form a current path through which the charging current or the discharging current of the battery pack 10 flows.
- the precharge relay 33 is connected in parallel with the first main relay 31 together with the precharge resistor 34.
- One end of the first main relay 31 is connected to the link wire 41, and the other end of the first main relay 31 is connected to the link wire 43.
- One end of the second main relay 32 is connected to the link wire 42, and the other end of the second main relay 32 is connected to the link wire 44.
- One end of the precharge relay 33 is connected to the link wire 43, the other end of the precharge relay 33 is connected to one end of the precharge resistor 34, and the other end of the precharge resistor 34 is It is connected to the link wire 41.
- the link wire 41 extends between the positive electrode of the battery pack 10 and one end of the first main relay 31, and the link wire 42 connects the negative electrode of the battery pack 10 and the second main relay 32.
- the link wire 43 extends between the other end of the first main relay 31 and the first input terminal IN1 of the external power device 2
- the link wire 44 is 2 It extends between the other end of the main relay 32 and the second input terminal IN2 of the external power device 2.
- the BMS 20 generates relay control signals RCS1-RCS3 that control the opening and closing of the first and second main relays 31 and 32 and the precharge relay 33 to generate the first and second main relays. (31, 32), and the precharge relay 33.
- the first main relay 31 is closed by the on level of the relay control signal RCS1 and opened by the off level of the relay control signal RCS1.
- the second main relay 32 is closed by the on level of the relay control signal RCS2 and opened by the off level of the relay control signal RCS2.
- the precharge relay 33 is closed by the on level of the relay control signal RCS3 and opened by the off level of the relay control signal RCS3.
- the BMS 20 controls the second main relay 32 and the precharge relay 33 to close, and for a predetermined first period After the lapse, the first main relay 31 can be controlled to be closed.
- the BMS 20 may control the precharge relay 33 to open after a predetermined second period elapses from the point in time when the first main relay 31 is closed.
- the BMS 20 generates the on-level relay control signals RCS2 and RCS3 to control the above operation, then generates the on-level relay control signal RCS1 after the first period has elapsed, and the second period has elapsed. After that, an off-level relay control signal RCS3 may be generated.
- the BMS 20 may close only the first main relay 31 for a predetermined diagnosis period before charging and discharging in order to diagnose an external short circuit of the battery system 1 .
- the relay control signal RCS1 may be at an on level, and the relay control signals RCS2 and RCS3 may be at an off level.
- the BMS 20 measures the voltage of the link wire 44, and measures the measured voltage of the link wire 44 (hereinafter referred to as negative link wire voltage) (VL-) and the positive voltage of the battery pack 10. If the voltage difference between (VP+) is less than or equal to a predetermined reference voltage, it can be determined that an external short circuit has occurred.
- VL- negative link wire voltage
- FIG. 2 is a circuit diagram illustrating a battery system during a diagnosis period for an external short circuit according to an exemplary embodiment.
- an electrical connection indicated by a dotted line between the link wires 43 and 44 may be formed by an external short circuit.
- the first main relay 31 is in a closed state.
- FIG. 3 is a flowchart illustrating an external shorting method according to an exemplary embodiment.
- the BMS (20) closes the first main relay (31) (S1). That is, the BMS 20 generates the on-level relay control signal RCS1 and supplies it to the first main relay 31 .
- the BMS (20) opens the second main relay (32) and the precharge relay (33) during the diagnosis period to perform an external short circuit.
- the BMS 20 measures the positive voltage VP+ and the negative link voltage VL- of the battery pack 10 (S2).
- the BMS 20 measures the positive voltage of the battery cell 10_1 as the battery pack 10 It can be measured as a positive voltage (VP+) of , and the voltage of the link wire 44 can be measured as a negative link voltage (VL-).
- the BMS 20 calculates a voltage difference VD between the positive voltage VP+ and the negative link voltage VL- of the battery pack 10 (S3). For example, the BMS 20 may calculate the voltage difference by subtracting the negative link voltage VL- from the positive voltage VP+.
- the BMS 20 compares the voltage difference (VD) and the reference voltage (VR) (S4). For example, the BMS 20 may compare whether the voltage difference (VD) is smaller than the reference voltage (VR), and the BMS 20 may compare the measured anode voltage (VP+) of the battery pack 10 with a predetermined ratio (eg For example, 50%) may be multiplied to generate the reference voltage VR.
- a predetermined ratio eg For example, 50%
- the ratio of 50% is an example, but the present invention is not limited thereto.
- step S5 if the voltage difference (VD) is smaller than the reference voltage (VR), the BMS 20 determines that an external short circuit has occurred (S5).
- the positive pole of the battery pack 10 is electrically connected to the link wire 44 through the first main relay 31 and the short circuit 45 .
- the negative link voltage VL ⁇ may become a level close to the positive voltage VP+.
- the voltage difference VD between the positive link voltage VP+ and the negative link voltage VL- becomes a very small voltage due to an external short circuit.
- the reference voltage VR may be set to a level for detecting a voltage difference VD when an external short circuit occurs.
- step S4 if the voltage difference is equal to or greater than the reference voltage, the BMS 20 determines that the external short circuit is not in a normal state and ends the diagnosis (S6). Under normal conditions, the negative link voltage (VL-) may be 0V.
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
Description
Claims (10)
- 복수의 배터리 셀을 포함하는 배터리 팩;상기 배터리 팩의 양극에 연결되어 있는 일단을 포함하는 제1 메인 릴레이;상기 배터리 팩의 음극에 연결되어 있는 일단을 포함하는 제2 메인 릴레이;상기 제1 메인 릴레이의 타단에 연결되어 있는 제1 링크 배선;상기 제2 메인 릴레이의 타단에 연결되어 있는 제2 링크 배선; 및상기 제1 메인 릴레이를 닫고, 상기 배터리 팩의 양극 전압 및 상기 제2 링크 배선의 음 링크 전압을 측정하며, 상기 배터리 팩의 양극 전압과 상기 음 링크 전압 간의 전압 차가 소정의 기준 전압 보다 작을 때, 외부 단락으로 결정하는 배터리 관리 시스템을 포함하는, 배터리 시스템.
- 제1항에 있어서,상기 배터리 관리 시스템은,상기 배터리 팩의 양극 전압에서 상기 음 링크 전압을 차감한 전압이 상기 기준 전압 보다 작을 때, 외부 단락으로 결정하는, 배터리 시스템.
- 제2항에 있어서,상기 배터리 관리 시스템은,상기 배터리 팩의 양극 전압에 소정 비율을 곱하여 상기 기준 전압을 생성하는, 배터리 시스템.
- 제1항에 있어서,상기 배터리 관리 시스템은,외부 단락을 결정하기 위한 소정의 진단 기간 동안, 상기 제1 메인 릴레이를 닫고, 상기 제2 메인 릴레이를 개방하는, 배터리 시스템.
- 제1항에 있어서,상기 제1 메인 릴레이에 대해서 병렬 연결되어 있는 프리챠지 릴레이를 더 포함하고,상기 배터리 관리 시스템은,외부 단락을 결정하기 위한 소정의 진단 기간 동안, 상기 제1 메인 릴레이를 닫고, 상기 프리챠지 릴레이를 개방하는, 배터리 시스템.
- 복수의 배터리 셀을 포함하는 배터리 팩의 양극에 연결되어 있는 일단을 포함하는 제1 메인 릴레이, 상기 배터리 팩의 음극에 연결되어 있는 일단을 포함하는 제2 메인 릴레이, 및 배터리 관리 시스템을 포함하는 배터리 시스템의 외부 단락을 진단하는 방법에 있어서, 상기 배터리 관리 시스템이,진단 기간 동안 상기 제1 메인 릴레이를 닫는 단계;상기 배터리 팩의 양극 전압 및 상기 제2 링크 배선의 음 링크 전압을 측정하는 단계;상기 배터리 팩의 양극 전압과 상기 음 링크 전압 간의 전압 차와 소정의 기준 전압을 비교하는 단계; 및상기 전압 차가 상기 기준 전압 보다 작을 때, 외부 단락으로 결정하는 단계를 포함하는, 배터리 시스템의 외부 단락 진단 방법.
- 제6항에 있어서,상기 전압 차와 소정의 기준 전압을 비교하는 단계는,상기 배터리 팩의 양극 전압에서 상기 음 링크 전압을 차감한 전압이 상기 기준 전압 보다 작은 지 비교하는 단계를 포함하는, 배터리 시스템의 외부 단락 진단 방법.
- 제7항에 있어서,상기 배터리 팩의 양극 전압에 소정 비율을 곱하여 상기 기준 전압을 생성하는 단계를 더 포함하는, 배터리 시스템의 외부 단락 진단 방법.
- 제6항에 있어서,상기 진단 기간 동안, 상기 제2 메인 릴레이는 개방하는 단계를 더 포함하는, 배터리 시스템의 외부 단락 진단 방법.
- 제6항에 있어서,상기 진단 기간 동안, 상기 제1 메인 릴레이에 대해서 병렬 연결되어 있는 프리챠지 릴레이를 개방하는 단계를 더 포함하는, 배터리 시스템의 외부 단락 진단 방법.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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CN202280041374.0A CN117460964A (zh) | 2022-01-06 | 2022-12-13 | 外部短路诊断方法和使用该方法的电池系统 |
EP22919039.2A EP4332599A1 (en) | 2022-01-06 | 2022-12-13 | External short-circuit diagnosis method and battery system using same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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KR1020220002134A KR20230106345A (ko) | 2022-01-06 | 2022-01-06 | 외부 단락 진단 방법 및 이를 적용한 배터리 시스템 |
KR10-2022-0002134 | 2022-01-06 |
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WO2023132502A1 true WO2023132502A1 (ko) | 2023-07-13 |
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PCT/KR2022/020237 WO2023132502A1 (ko) | 2022-01-06 | 2022-12-13 | 외부 단락 진단 방법 및 이를 적용한 배터리 시스템 |
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EP (1) | EP4332599A1 (ko) |
KR (1) | KR20230106345A (ko) |
CN (1) | CN117460964A (ko) |
WO (1) | WO2023132502A1 (ko) |
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JP2007165253A (ja) * | 2005-12-16 | 2007-06-28 | Panasonic Ev Energy Co Ltd | 電源装置、及びその制御方法 |
JP2013145175A (ja) * | 2012-01-13 | 2013-07-25 | Toyota Motor Corp | 電池システムおよび短絡検出方法 |
US10106036B2 (en) * | 2013-10-27 | 2018-10-23 | Commissariat à l'énergie atomique et aux énergies alternatives | Protecting a power supply including a plurality of batteries in parallel against an external short-circuit |
JP2021069229A (ja) * | 2019-10-25 | 2021-04-30 | プライムアースEvエナジー株式会社 | 二次電池システム |
KR20220000740A (ko) * | 2020-06-26 | 2022-01-04 | 주식회사 엘지에너지솔루션 | 배터리 모듈의 외부 및 내부 단락을 감지하기 위한 배터리 관리 시스템 및 이를 포함하는 배터리 팩 |
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2022
- 2022-01-06 KR KR1020220002134A patent/KR20230106345A/ko unknown
- 2022-12-13 WO PCT/KR2022/020237 patent/WO2023132502A1/ko active Application Filing
- 2022-12-13 EP EP22919039.2A patent/EP4332599A1/en active Pending
- 2022-12-13 CN CN202280041374.0A patent/CN117460964A/zh active Pending
Patent Citations (5)
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JP2007165253A (ja) * | 2005-12-16 | 2007-06-28 | Panasonic Ev Energy Co Ltd | 電源装置、及びその制御方法 |
JP2013145175A (ja) * | 2012-01-13 | 2013-07-25 | Toyota Motor Corp | 電池システムおよび短絡検出方法 |
US10106036B2 (en) * | 2013-10-27 | 2018-10-23 | Commissariat à l'énergie atomique et aux énergies alternatives | Protecting a power supply including a plurality of batteries in parallel against an external short-circuit |
JP2021069229A (ja) * | 2019-10-25 | 2021-04-30 | プライムアースEvエナジー株式会社 | 二次電池システム |
KR20220000740A (ko) * | 2020-06-26 | 2022-01-04 | 주식회사 엘지에너지솔루션 | 배터리 모듈의 외부 및 내부 단락을 감지하기 위한 배터리 관리 시스템 및 이를 포함하는 배터리 팩 |
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