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GB/T 38661-2020 English PDF (GBT38661-2020)

GB/T 38661-2020 English PDF (GBT38661-2020)

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GB/T 38661-2020: Technical specifications of battery management system for electric vehicles

This Standard specifies the technical requirements, test methods and inspection rules of power storage battery management system for electric vehicles. 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.
GB/T 38661-2020
NATIONAL STANDARD OF THE
PEOPLE 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 Republic of
China.
Table of Contents
Foreword ... 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 ... 42
Technical Specifications of Battery Management
System for Electric Vehicles
1 Scope
This 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 References
The 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 Vehicle
GB/T 28046.1-2011 Road Vehicles - Environmental Conditions and Testing for Electrical and Electronic Equipment - Part 1: General
GB/T 28046.2-2011 Road Vehicles - Environmental Conditions and Testing for Electrical and Electronic Equipment - Part 2: Electrical Loads
GB/T 28046.3-2011 Road Vehicles - Environmental Conditions and Testing for Electrical and Electronic Equipment - Part 3: Mechanical Loads
GB/T 28046.4-2011 Road Vehicles - Environmental Conditions and Testing for Electrical and Electronic Equipment - Part 4: Climatic Loads
GB/T 33014.2 Road Vehicles - Component Test Methods for Electrical / Electronic Disturbances from Narrowband Radiated Electromagnetic Energy - Part 2: Absorber- lined Shielded Enclosure
GB/T 33014.4 Road Vehicles - Component Test Methods for Electrical / Electronic Disturbances from Narrowband Radiated Electromagnetic Energy - Part 4: Bulk Current Injection (BCI)
ISO 11452-8:2015 Road Vehicles - Component Test Methods for Electrical
Disturbances from Narrowband Radiated Electromagnetic Energy - Part 8: Immunity to Magnetic Fields
3 Terms and Definitions
What is defined in GB/T 4365, GB/T 19596-2017 and GB/T 28046.1-2011, and the following terms and definitions are applicable to this document. For ease of use, some terms and definitions in GB/T 19596-2017 are repeatedly listed out.
3.1 Battery Electronics
Battery electronics refers to an electronic device that collects or simultaneously monitors electrical and thermal data of secondary cells or modules. If necessary, it may include electronic components used for secondary cell equilibrium.
NOTE: battery electronics may include secondary cell controller; the equilibrium between secondary cells may be controlled by battery electronics, or, through battery control unit.
[GB/T 19596-2017, Definition 3.3.2.1.5]
3.2 Battery Control Unit
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 Requirements
5.1 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.
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.
5.4.5 Insulation resistance
In terms of battery management system equipped with the insulation resistance value detection function, when the total battery voltage (nominal) is above 400 V (including 400 V), the relative error of insulation resistance detection shall be -20 % ~ +20%; when the total battery voltage (nominal) is below 400 V, the relative error of insulation resistance detection shall be -30% ~ +30%.
When the insulation resistance is less than, or equals to 50 k???, the detection accuracy 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.
5.8.6 Reverse voltage
The battery management system shall be tested in accordance with 6.6.6. The functional status shall reach Level-C specified in Appendix A.
5.8.7 Short-circuit protection
The battery management system shall be tested in accordance with 6.6.7. The functional status shall reach Level-C specified in Appendix A.
5.9 Environmental Adaptability
5.9.1 Sinusoidal vibration
The battery management system shall be able to endure the vibration test specified in 6.7.1. After the test, it shall be able to normally function and satisfy the requirements for state parameter measurement accuracy in 5.4. In addition, it shall pass visual inspection and there shall be no falling-off of components and parts.
5.9.2 Random vibration
The battery management system shall receive the salt mist resistance test in accordance with 6.7.8; no saltwater is allowed to enter the housing. Under the operating mode specified in GB/T 28046.1-2011 in 3.2, the functional status shall reach Level-A specified in Appendix A. For test objects completely placed in the passenger compartment, luggage compartment or cargo compartment, the salt mist resistance test is not required. For test objects installed inside the battery compartment, if the compartment?€?s protection level reaches IP 67, the salt mist resistance test may not be performed.
5.9.9 Damp heat cycle
The battery management system shall receive the damp heat cycle test in accordance with 6.7.9. The functional status shall reach Level-A specified in Appendix A. 5.10 Electromagnetic Compatibility Performance
5.10.1 Conduction disturbance
The battery management system shall be tested in accordance with 6.8.2. If OEMs and the manufacturers do not have special stipulations, the limit value of conduction disturbance shall comply with the requirements of Level-3 specified in GB/T 18655- 2018.
5.10.2 Radiation disturbance
The battery management system shall be tested in accordance with 6.8.3. If OEMs and the manufacturers do not have special stipulations, the limit value of radiation disturbance shall comply with the requirements of Level-3 specified in GB/T 18655- 2018.
5.10.3 Transient conduction immunity of power line
The battery management system shall be tested in accordance with 6.8.4. If OEMs and the manufacturers do not have special stipulations, the requirements for functional status in the test result are shown in Table 4.
Table 4 -- Requirements for Transient Conduction Immunity of Power Line of Battery Management System
5.10.4 Transient conduction immunity of signal line / control line
The battery management system shall be tested in accordance with 6.8.5. If OEMs Test Pulse
System?€?s
Functional Status
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 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.
6.6.3 Superimposed AC voltage
In accordance with the stipulations of 4.4 in GB/T 28046.2-2011, conduct superimposed AC voltage test.
6.6.4 Slow drop and rise of supply voltage
In accordance with the stipulations of 4.5 in GB/T 28046.2-2011, conduct supply voltage slow drop and rise test.
6.6.5 Transient changes of supply voltage
In accordance with the stipulations of 4.6 in GB/T 28046.2-2011, conduct supply voltage transient change test.
6.6.6 Reverse voltage
In accordance with the stipulations of 4.7 in GB/T 28046.2-2011, conduct reverse voltage test.
6.6.7 Short-circuit protection
In accordance with the stipulations of 4.10.2 in GB/T 28046.2-2011, conduct short- circuit protection test.
6.7 Environmental Adaptability
6.7.1 Sinusoidal vibration
In accordance with the stipulations of GB/T 28046.3-2011, conduct sinusoidal vibration test. The test method and test level shall be determined by OEMs and the manufacturers in accordance with the installation location of the battery management system through negotiation.
resistance test. In accordance with the requirements of Table 4 and Appendix A in GB/T 28046.4-2011, and the installation location, determine whether salt mist resistance test shall be conducted.
6.7.9 Damp heat cycle
In accordance with the requirements of Table 4 and Appendix A in GB/T 28046.4-2011, and the installation location, determine whether damp heat cycle test shall be conducted in accordance with the stipulations of 5.6.2.2 in GB/T 28046.4-2011; the maximum temperature is 65 ??C; cycle for 5 times.
6.8 Electromagnetic Compatibility
6.8.1 General rules
6.8.1.1 The battery shall be provided by the manufacturer of the battery management system; constitute a basic test unit together with the battery management system to simulate the actual installation for tests.
6.8.1.2 During the test process, record the data collected by the battery management system (the number of secondary cell or cell group voltage acquisition channels 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). Compare it with the corresponding data detected by the detection equipment.
6.8.1.3 Isolation devices shall be used to isolate auxiliary equipment (such as: upper computer and monitoring software).
6.8.1.4 Charging and discharging current shall be not less than 2% of the full scale of current measurement of the battery management system.
6.8.2 Conduction disturbance
In accordance with the test method in GB/T 18655-2018, and specific test object, select the voltage method and the current probe method to conduct conduction disturbance test.
6.8.3 Radiation disturbance
In accordance with the test method in GB/T 18655-2018, conduct radiation disturbance test.
6.8.4 Transient conduction immunity of power line
In accordance with the test method in GB/T 21437.2-2008, conduct transient conduction immunity test of power line. The test severity shall be Level-III. 6.8.5 Transient conduction immunity of signal line / control line
Appendix B
(normative)
Test Method for SOC Accumulative Error
B.1 General
B.1.1 In accordance with the requirements of normal operation, assemble the battery system to be tested (the smallest battery system suitable for the battery management system may be selected), or, adopt the battery simulation system.
B.1.2 At three temperature points: -20 ??C ?? 2 ??C, 25 ??C ?? 2 ??C, 65 ??C ?? 2 ??C, respectively conduct the test. During the test, place the battery management system and its accessories related to ampere-hour integration under the selected test environment and temperature conditions; the battery pack may be placed at room temperature through the negotiation by OEMs and the manufacturers. Firstly, the battery system shall carry out the test content specified in B.2, then, the test content specified in B.3.
B.1.3 In addition to the environmental adaptation process, when it is placed still during the test, in accordance with the manufacturer?€?s technical specifications, it can be determined whether the battery management is in the operating state.
B.1.4 When the battery...

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