QC/T 1240-2025 Peak power test methods for traction battery ofelectric vehicle English, Anglais, Englisch, Inglés, えいご
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ICS
T
Professional Standard of the People's Republic of China
QC/T 1240-2025
Peak power test methods for traction battery of electric vehicle
电动汽车动力蓄电池峰值功率试验方法
(English Translation)
Issue date: 2025-12-17 Implementation date: 2026-07-01
Issued by the Ministry of Industry and Information Technology of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Type Dimensions
5 Technical Requirements
6 Product NumberingHexagon Flange Bolts for Automotive Use
7 Product Numbering
8 Assembly Torque
9 Marking, Acceptance, and Packaging
Test Method for Peak Power of Electric Vehicle Traction Batteries
1 Scope
This document specifies the test method for determining the peak power of traction batteries used in electric vehicles (hereinafter referred to as "batteries").
This document applies to the testing of peak power for electric vehicle traction battery cells and modules.
2 Normative References
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 19596 Terminology of electric vehicles
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 19596 and the following apply.
3.1 rated capacity
The capacity value of a battery cell or module measured under the conditions specified by the manufacturer and declared by the manufacturer.
Note: Rated capacity is usually expressed in ampere-hours (Ah) or milliampere-hours (mAh).
[SOURCE: GB 38031—2020, 3.7, modified]
3.2 peak power
The maximum power achievable by a battery cell or module during a specified pulse charge/discharge duration, under specified conditions of temperature, SOC, and operating voltage range.
3.3 state-of-charge (SOC)
The percentage of the actual capacity that a battery cell or battery module can deliver under the discharge conditions specified by the manufacturer.
[SOURCE: GB 38031—2020, 3.9, modified]
3.4 open-circuit voltage
The voltage of the battery when the charge/discharge current is zero and it is in a stable condition.
4 Abbreviations and Symbols
4.1 Abbreviations
The following abbreviations apply to this document.
FS: Full Scale
OCV: Open-Circuit Voltage
SOC: State of Charge
4.2 Symbols
The following symbols apply to this document.
I₃: 3-hour-rate discharge current (A), the value of which is equal to one-third of the rated capacity value.
C₃: 3-hour-rate discharge capacity at room temperature (Ah).
5 Test Methods
5.1 Test Conditions
5.1.1 Unless otherwise specified, tests shall be conducted in an environment at room temperature (25 °C ± 2 °C), with relative humidity between 10% and 90%, and atmospheric pressure between 86 kPa and 106 kPa.
5.1.2 The accuracy requirements for measuring devices are as follows:
a) Temperature measuring device: ±1 °C;
b) Time measuring device: ±0.1 s;
c) Current measuring device: ±0.05% FS;
d) Voltage measuring device: ±0.05% FS.
5.1.3 Unless otherwise specified in specific test items, the recording interval for test data (such as time, temperature, current, and voltage) shall not exceed 10 s.
5.1.4 Necessary operational documents, electrical interface components, communication protocols, etc., as well as conditions for test initiation and termination, shall be provided during testing to ensure the safety of the entire test process.
5.1.5 The discharge current of the battery is defined as positive, and the charge current is defined as negative.
5.1.6 When changing the target ambient temperature for testing, the battery shall be allowed to stabilize at the target ambient temperature for 12 hours before testing. This stabilization period may be terminated earlier if the following conditions are met:
a) The difference between the battery temperature and the target ambient temperature does not exceed 2 °C;
b) The rate of change of the battery temperature does not exceed 1 °C/h for at least 30 minutes.
5.1.7 During testing and data processing, the battery's discharge capacity at room temperature (see 5.5) shall be used as the basis for SOC calculation.
5.1.8 Method for adjusting the SOC to the test target value of n%: Starting from an initial SOC state of m% (m > n), discharge the sample at a constant current equal to I₃ (1/3 C₃) for a duration t, where t is calculated according to formula (1). Alternatively, adjust the SOC according to the method provided by the manufacturer. After each SOC adjustment, the battery shall rest for at least 30 minutes before a new test begins.
5.1.9 The contact resistance between the positive and negative terminals (tabs) of the battery sample and the channel wiring shall not exceed 0.1 mΩ each.
5.2 Test Preparation
5.2.1 Inspect the appearance and polarity of the sample to be tested. The sample shall show no deformation or cracks on its surface, which should be free of burrs, dry, without external damage or contamination. The polarity markings on the terminals shall be correct and clear.
