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Similar standardsGB/T 38661-2020: Technical Specifications of Battery Management System for Electric Vehicles---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT38661-2020NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.080 T 47 Technical Specifications of Battery Management System for Electric Vehicles Issued on: MARCH 31, 2020 Implemented on: OCTOBER 1, 2020 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative References... 4 3 Terms and Definitions... 5 4 Abbreviations and Symbols... 6 5 Technical Requirements... 7 6 Test Methods... 15 7 Inspection Rules... 22 Appendix A (normative) System Functional Status Level... 26 Appendix B (normative) Test Method for SOC Accumulative Error... 27 Appendix C (informative) SOC Error Correction Speed Test... 30 Appendix D (informative) SOP Estimation Error Test Method... 37 Appendix E (informative) Equilibrium Test Method... 40 Appendix F (informative) Typical Charging and Discharging Working Conditions of Battery System... 421 ScopeThis Standard specifies the technical requirements, test methods and inspection rules of power storage battery management system for electric vehicles (hereinafter referred to as battery management system). This Standard is applicable to li-ion power battery and nickel-hydrogen power battery management system for electric vehicles. The management system of other types of power storage battery may take this as a reference.2 Normative ReferencesThe following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 4365 Electrotechnical Terminology - Electromagnetic Compatibility GB/T 17626.4-2018 Electromagnetic Compatibility - Testing and Measurement Techniques - Electrical Fast Transient / Burst Immunity Test GB/T 18384.3-2015 Electrically Propelled Road Vehicles - Safety Specifications - Part 3.Protection of Persons against Electric Shock GB/T 18655-2018 Vehicles, Boats, and Internal Combustion Engines - Radio Disturbance Characteristics - Limits and Methods of Measurement for the Protection of On-board Receivers GB/T 19596-2017 Terminology of Electric Vehicles GB/T 19951 Road Vehicles - Disturbances Test Methods for Electrical / Electronic Component from Electrostatic Discharge GB/T 21437.2-2008 Road Vehicles - Electrical Disturbances from Conduction and Coupling - Part 2.Electrical Transient Conduction along Supply Lines Only GB/T 21437.3-2012 Road Vehicles - Electrical Disturbances from Conduction and Coupling - Part 3.Electrical Transient Transmission by Capacitive and Inductive Coupling via Lines other than Supply Lines GB/T 27930 Communication Protocols between Off-board Conductive Charger and Battery Management System for Electric Vehicle4 Abbreviations and Symbols4.1 Abbreviations The following abbreviations are applicable to this document. BCU. Battery Control Unit BMS. Battery Management System FS. Full Scale NOTE. FS refers to the absolute value of the maximum measurable value of the battery management system. SOC. State of Charge SOP. State of Power 4.2 Symbols The following symbols are applicable to this document. C1.1 h rated capacity (Ah). I1.1 h discharging current (A), whose value equals to the rated capacity.5 Technical Requirements5.1 Service Environment 5.1.1 Operating Temperature -20 °C ~ 65 °C, or, negotiated and determined by OEMs and manufacturers in accordance with the stipulations of GB/T 28046.4-2011, and the installation location of the battery management system. 5.1.2 Storage temperature -40 °C ~ 85 °C, or, negotiated and determined by OEMs and manufacturers in accordance with the stipulations of GB/T 28046.4-2011, and the installation location of the battery management system. 5.1.3 Operating humidity 5% ~ 95%, or, negotiated and determined by OEMs and manufacturers in accordance with the stipulations of GB/T 28046.4-2011, and the installation location of the battery management system. 5.2 Supply Voltage The range of supply voltage is shown in Table 1, or, negotiated and determined by OEMs and manufacturers. 5.3 Basic Functional Requirements 5.3.1 The battery management system shall be able to monitor, or through other modes, obtain battery-related data, which shall include the total voltage of battery system, secondary cell voltage or cell group voltage, battery module voltage (nickel-metal hydride battery), battery system current, internal temperature of battery pack and other parameters. 5.3.2 The battery management system shall be equipped with the functions of fault diagnosis, fault information recording and fault handling, such as. fault code submission, real-time warning and fault protection, etc. 5.3.3 The battery management system shall have a self-checking function, which initially screens and identifies the main functions of the battery management system and provides early warning of functional abnormalities that would seriously affect the use and safety. 5.3.4 The battery management system shall have the function of information interaction with other controllers of the vehicle. 5.3.5 Battery management system with charging process control and management functions shall be able to implement real-time communication with on-board charger or off-board charger. The communication protocol with the off-board charger shall comply with the requirements of GB/T 27930. 5.3.6 Battery management system with insulation resistance value detection function shall implement monitoring of the insulation resistance of the battery system. 5.3.7 Battery management system with charge and discharge high-voltage interlock monitoring function shall implement the monitoring of charge and discharge high- voltage interlock of the battery system. 5.3.8 The battery management system shall be equipped with protection functions to prevent the battery system from over-charging, over-discharging, over-current and over-temperature. 5.3.9 The battery management system shall be equipped with SOC estimation function; Nominal Voltage /V Supply Voltage /V Minimum Operating Voltage USmin Maximum Operating Voltage USmax should have SOP estimation and equilibrium function. 5.4 State Parameter Measurement Accuracy 5.4.1 Total voltage The detection accuracy of total voltage shall satisfy ± 1% FS. 5.4.2 Total current 5.4.2.1 In terms of li-ion power battery, the detection accuracy of total current shall satisfy ± 2% FS. 5.4.2.2 In terms of nickel-hydrogen power battery, the detection accuracy of total current shall satisfy ± 3% FS. 5.4.3 Secondary cell (cell group) voltage 5.4.3.1 In terms of li-ion power battery, the detection accuracy of secondary cell (cell group) voltage shall satisfy ± 0.5% FS; the absolute value of the maximum error shall be not more than 10 mV. 5.4.3.2 In terms of nickel-hydrogen power battery, the detection accuracy of secondary cell (cell group) voltage or module voltage shall satisfy ± 1% FS. 5.4.4 Temperature 5.4.4.1 In terms of li-ion power battery, within the range of -20 °C ~ 65 °C (including - 20 °C and 65 °C), the temperature detection accuracy shall satisfy ± 2 °C; within the range of -40 °C ~ -20 °C and 65 °C ~ 125 °C (or the highest measured temperature calibrated by the battery management system), the temperature detection accuracy shall satisfy ± 3 °C. 5.4.4.2 In terms of nickel-hydrogen power battery, within the range of -20 °C ~ 65 °C (including -20 °C and 65 °C), the temperature detection accuracy shall satisfy ± 3 °C; within the range of -40 °C ~ -20 °C and 65 °C ~ 125 °C (or the highest measured temperature calibrated by the battery management system), the temperature detection accuracy shall satisfy ± 5 °C. 5.5 SOC Estimation For pure electric vehicles, and hybrid electric vehicles that can be externally charged, the accumulative error of SOC estimation of the battery management system shall be not more than 5%. For hybrid electric vehicles that cannot be externally charged, the accumulative error of SOC estimation of the li-ion battery management system shall be not more than 15%; the accumulative error of SOC estimation of the nickel-hydrogen battery management system shall be not more than 20%. 5.6 Battery Fault Diagnosis The basic items and expandable items of the battery management system for fault diagnosis of the battery system are respectively shown in Table 2 and Table 3.The fault diagnosis items listed in Table 2 are the basic requirements. In accordance with the functional design of the vehicle and the specific demands for the battery system, the specific diagnosis content of the battery management system may not be limited to the items listed in Table 2 and Table 3. 5.7 Insulation Performance 5.7.1 Insulation resistance The battery management system shall receive the insulation resistance test in accordance with 6.5.1.When the battery management system is not working, the insulation resistance between the live parts connected to the power battery and the terminals of its power supply shall be not less than 10 M; when the battery management system is working, the insulation resistance between the live parts connected to the power battery and the terminals of its power supply shall satisfy the following requirements. at the maximum operating voltage of the power battery, the insulation resistance of the DC circuit shall be not less than 100 /V, and the insulation resistance of the AC circuit shall be not less than 500 /V. NOTE. battery management system is not working means the battery management system power is off. 5.7.2 Voltage resistance The battery management system shall receive the voltage resistance test in accordance with 6.5.2; the leakage current limit shall be determined by OEMs and manufacturers through negotiation. During the test process, there shall be no destructive discharge phenomena, such as. breakdown or flashover. 5.8 Electrical Adaptability 5.8.1 DC supply voltage The battery management system shall be tested in accordance with 6.6.1.The functional status shall reach Level-A specified in Appendix A. 5.8.2 Overvoltage The battery management system shall be tested in accordance with 6.6.2.The functional status shall reach Level-C specified in Appendix A. 5.8.3 Superimposed AC voltage The battery management system shall be tested in accordance with 6.6.3.When the nominal voltage is 12 V, the system test severity level is 2.When the nominal voltage is 24 V, the system test severity level is 3.The functional status shall reach Level-A specified in Appendix A. 5.8.4 Slow drop and rise of supply voltage The battery management system shall be tested in accordance with 6.6.4.Within the range of the supply voltage, the functional status shall reach Level-A as specified in Appendix A. Beyond the range of the supply voltage, the functional status shall at least reach Level-C specified in Appendix A. 5.8.5 Transient changes of supply voltage The battery management system shall be tested in accordance with 6.6.5.The functional status shall reach Level-C specified in Appendix A.6 Test Methods6.1 Test Conditions 6.1.1 Environmental conditions Unless it is otherwise stipulated, the tests shall be conducted under the environment. room temperature 25 °C ± 5 °C; relative humidity 15% ~ 90%; atmospheric pressure 86 kPa ~ 106 kPa. 6.1.2 Test instruments All the test instruments and equipment shall have sufficient accuracy and stability; the accuracy shall be an order of magnitude higher than the measured index accuracy, or, the error shall be less than 1/3 of the allowable error of the measured parameter. During the test process, if battery simulation system is used, then, the analog instrument and equipment must satisfy the following conditions. a) The voltage stabilization accuracy of secondary cell voltage analog equipment must be less than 1 mV; its power frequency ripple voltage must be less than 0.5 mV; b) The voltage stabilization accuracy of total voltage analog equipment must be less than 0.1%; its power frequency ripple voltage must be less than 0.05%; c) The sampling accuracy of total current signal source must be 0.2%; the response time must be less than 20 ms. 6.2 State Parameter Measurement Accuracy 6.2.1 General rules 6.2.1.1 In accordance with the requirements of normal operation, assemble and connect the battery system, or, through the simulation system (the simulation system’s ripple coefficient, accuracy, stability and other indicators shall reach the corresponding level that does not affect the test result), provide the electrical signals that the battery management system needs to monitor; correctly install and arrange the voltage, current, temperature and insulation resistance of the detection equipment; connect the working power supply of the battery management system. 6.2.1.2 Compare the data collected by the battery management system (the voltage acquisition channel of the secondary cell or cell group voltage is not less than the number of sampling units of one independent power supply; the number of temperature acquisition channels is not less than 2) with the corresponding data detected by the detection equipment. 6.2.1.3 Unless it is otherwise stipulated, test temperature refers to the temperature of the battery management system of the test object. 6.2.1.4 When using battery system for tests, if the battery system cannot satisfy the set value requirements of the tests, test points may be determined by OEMs and the manufacturers through negotiation; differential content needs to be stated in the test report. 6.2.2 Total voltage At -20 °C ± 2 °C, 25 °C ± 2 °C and 65 °C ± 2 °C (or, it may be determined by OEMs and the manufacturers through negotiation in accordance with the practical application), respectively detect 50%, 75% and 100% full-scale total voltage of the battery system. Compare the data collected by the battery management system with the data monitored by the detection equipment. 6.2.3 Total current At -20 °C ± 2 °C, 25 °C ± 2 °C and 65 °C ± 2 °C (or, it may be determined by OEMs and the manufacturers through negotiation in accordance with the practical application), respectively detect 0%, ± 50% and ± 100% full-scale total current of the battery system. Compare the data collected by the battery management system with the data monitored by the detection equipment. 6.2.4 Secondary cell (cell group) voltage 6.2.4.1 In terms of li-ion battery, at -20 °C ± 2 °C, 25 °C ± 2 °C and 65 °C ± 2 °C (or, it may be determined by OEMs and the manufacturers through negotiation in accordance with the practical application), respectively detect 1.5 V, 3 V and 4.5 V secondary cell voltage (the number of channels is not less than the number of sampling units of one independent power supply). Compare the data collected by the battery management system with the data monitored by the detection equipment. 6.2.4.2 In terms of nickel-metal hydride battery, at -20 °C ± 2 °C, 25 °C ± 2 °C and 65 °C ± 2 °C (or, it may be determined by OEMs and the manufacturers through negotiation in accordance with the practical application), respectively detect module voltage n 1.0 V, n 1.2 V, n 1.6 V (n is the number of secondary cells connected in series in the module, where the number of channels is not less than the number of sampling units of one independent power supply). Compare the data collected by the battery management system with the data monitored by the detection equipment. 6.2.5 Temperature At -20 °C ± 2 °C, 25 °C ± 2 °C and 65 °C ± 2 °C (or, it may be determined by OEMs and the manufacturers through negotiation in accordance with the practical application), simultaneously place the probe of the temperature measurement device of the battery management system and the probe of the sensor of the detection equipment at -40 °C, 0 °C, 25 °C, 40 °C and 125 °C (or the highest measured temperature calibrated by the battery management system); measure the temperature value. Compare the data collected by the battery management system with the data monitored by the detection equipment. 6.2.6 Insulation resistance Under 50%, 75% and 100% full-scale voltage, respectively connect the total positive to ground and the total negative to ground of the battery to the insulation resistance array. In accordance with 80 /V, 100 /V, 300 /V, 500 /V and 2 /V, respectively control the insulation resistance array to different resistance values. Compare the data collected by the battery management system with the actual resistance value of the insulation resistance array. 6.3 SOC Estimation Accuracy In this Standard, SOC estimation accuracy test includes SOC accumulative error test and SOC error correction speed test. SOC accumulative error test shall be conducted in accordance with Appendix B. SOC error correction speed test may be conducted in accordance with Appendix C. SOC estimation error test caused by battery aging or other factors shall be negotiated by OEMs and the manufacturers. 6.4 Battery Fault Diagnosis Through the simulation system, establish triggering conditions that satisfy the fault items listed in Table 2.Record corresponding fault items and their triggering conditions. In accordance with the requirements of the manufacturer’s technical specifications, conduct function confirmation of other fault diagnosis items. 6.5 Insulation Performance 6.5.1 Insulation resistance 6.5.1.1 In accordance with Table 5, apply DC voltage between the live parts connected to the power battery and the terminals of its power supply; maintain for 60 s. 6.5.1.2 After completing the damp heat cycle test in 6.7.9, place it at room temperature for 0.5 h. In accordance with Table 5, apply DC voltage between the live parts connected to the power battery and the terminals of its power supply; maintain for 60 s. 6.5.1.3 During the measurement, if the test object’s insulation monitoring function would affect the test result, the insulation monitoring function shall be turned off, or, the insulation resistance monitoring unit shall be disconnected from the test object. Table 5 -- Test Voltage of Insulation Resistance 6.5.2 Voltage resistance After completing the damp heat cycle test in 6.7.9, place it at room temperature for 0.5 h. Adopt the test voltage (OEMs shall provide sufficient evidence to prove that the test voltage can ensure safety) specified by OEMs for tests. If OEMs do not specify the voltage resistance requirements, then, in accordance with the following requirements, apply the AC test voltage (50 Hz ~ 60 Hz) specified in 7.3.3.3.2 of GB/T 18384.3-2015; maintain for 60 s. ---Between terminals with electrical insulation; ---Between the terminal with electrical insulation and the housing with electrically conductive surface; ---Under the circumstance of plastic housing, between the terminal and the electrode that encloses the housing. Rated Voltage of Battery System U/V Voltage of Insulation Resistance Test Instrument/V Or, DC test voltage may also be applied; the equivalent DC test voltage is 1.41 times of the AC voltage value. 6.6 Electrical Adaptability 6.6.1 DC supply voltage In accordance with the stipulations of 4.2 in GB/T 28046.2-2011, conduct DC supply voltage test. 6.6.2 Overvoltage In accordance with the stipulations of 4.3 in GB/T 28046.2-2011, conduct overvoltage test.7 Inspection Rules7.1 Inspection Object Inspection object is divided into three types. battery electronics, battery control unit and Discharging Mode Direct Contact Discharge Air Discharge Discharging Voltage (no power) a Discharging Voltage (with power) a The functional status A of no-power test is determined after the test. battery management system. The specific inspection items and inspection objects are shown in Table 7. 7.2 Inspection Classification Inspection is divided into exit-factory inspection and type inspection. The specific inspection item grouping is shown in Table 8, or, is determined by the manufacturers and testing organizations through negotiation. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 38661-2020 be delivered?Answer: The full copy PDF of English version of GB/T 38661-2020 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 38661-2020_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 38661-2020_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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