GB/T 31486-2024 Electrical performance requirements and test methods for traction battery of electric vehicle
1 Scope
This document specifies the electrical performance requirements for traction battery cell of electric vehicle (hereinafter referred to as "battery cell") and describes the corresponding test methods.
This document is applicable to the lithium ion batteries and nickel-metal hydride battery cells installed on electric vehicles, and also a reference for other types of batteries.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 10592-2023 Specifications for low/high temperature testing chambers
GB/T 19596 Terminology of electric vehicles
GB 38031 Electric vehicles traction battery safety requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 19596 and GB 38031 and the following apply.
3.1
high energy battery
battery of which the ratio of maximum permissible continuous output electric power (W) to 3I3 rated discharge energy (Wh) at room temperature is less than 10
Note: High energy batteries are typically used in battery electric vehicle (BEV) and plug-in hybrid electric vehicle (PHEV).
[Source: GB/T 19596-2017, 3.3.1.1.1.3, modified]
3.2
high power battery
the battery of which the ratio of maximum permissible continuous output electric power (W) to 1 I1 rated discharge energy (Wh) at room temperature is not less than 10
Note: High power batteries are typically used in hybrid electric vehicles (HEV).
[Source: GB/T 19596-2017, 3.3.1.1.1.4, modified]
3.3
rated capacity
capacity (Ah) measured at a discharge current of 1I3 for high energy battery and 1 I1 for high power battery and declared by the manufacturer after being fully charged at room temperature
[Source: GB/T 19596-2017, 3.3.3.4.2, modified]
3.4
rated energy
energy (Wh) measured at a discharge current of 1 I3 for high energy battery and 1 I1 for high power battery and declared by the manufacturer after being fully charged at room temperature
[Source: GB/T 19596-2017, 3.3.3.5.3, modified]
3.5
initial capacity
discharge capacity (Ah) of the newly-manufactured traction battery when it is fully charged at room temperature, and is discharged to the discharge termination condition specified by the manufacturer with the current of 1 I3 for high energy battery and 1 I1 for high power battery
[Source: GB/T 19596-2017, 3.3.3.5.1, modified]
4 Symbols
For the purposes of this document, the following symbols apply.
I3: 3 h rate discharge current (A), which is equal to 1/3 of the rated capacity.
I1: 1 h rate discharge current (A), which is equal to the rated capacity.
5 Performance requirements
5.1 Appearance
Battery cells shall be inspected according to 6.2.1, the appearance shall be free of deformation and cracks, the surface shall be dry and free of burrs, external damage and dirt, and there shall be clear and correct marks.
5.2 Polarity marking
Battery cells are inspected in accordance with 6.2.2, and terminal polarity markings shall be correct and clear.
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Performance requirements
5.1 Appearance
5.2 Polarity marking
5.3 Mass and overall dimensions
5.4 Discharge capacity at room temperature
5.5 Rate discharge capacity at room temperature
5.6 Rate charging performance at room temperature
5.7 Discharge capacity at low temperature
5.8 Discharge capacity at high temperature
5.9 Charge retention and capacity recovery
5.10 Storage
6 Test methods
6.1 Test conditions
6.2 Test methods
6.3 Test items
Annex A (Normative) Tooling for high and low temperature test chamber
Bibliography
