Lithium-ion batteries for power energy storage
GB/T 36276-2023 will be implemented on July 1, 2024

GB/T 36276-2023 "Lithium-ion Batteries for Electric Power Storage" was released on December 28, 2023, and will be implemented on July 1, 2024. The China Quality Certification Center (CQC) recently reviewed CQC13-464225-2018 The "Safety and Performance Certification Rules for Lithium-Ion Batteries for Electrochemical Energy Storage" and its supporting documents have been revised. The revised rule number is CQC13-464225-2024. Involved product category: 024023. The relevant matters are hereby notified as follows:

1. Main revisions to certification rules

1. In the certification mode, "product inspection" is changed to "type testing";

2. 4.2.1 Certification is based on the standard GB/T 36276-2023 instead of GB/T 36276-2018. Delete IEC 62619:2017;

3. Delete the requirement “7.4 Supervision Sampling”;

4. The certification mark is modified to "CQC Basic Certification Mark";

5. The "CQC Mark Management Measures" are revised to "General Requirements for Product Certification Marks (Marks)".

2. Implement the requirements of the revised rules

From May 27, 2024 to July 1, 2024, applicants can apply for certification in accordance with the revised implementation rules, and enterprises can voluntarily choose to implement certification in accordance with the new version of the standard or the old version of the standard. The old version of rules CQC13-464225-2018 and standards can be transitioned to June 30, 2024.
Starting from July 1, 2024, the new version of the standard should be used to implement certification and the new version of standard certification certificate should be issued, and the old version of standard certification certificate will no longer be issued.

For the old version of the standard certification certificate, the holder should promptly submit an application for conversion to the new version of the standard certification certificate to our organization, and complete the product confirmation and certificate replacement work according to the new version of the standard after the standard implementation date and before the end of the next supervisory inspection.

The conversion of all old standard certification certificates should be completed by June 30, 2025 at the latest. If it is not completed within the time limit, our center will suspend the old version of the standard certification certificate; if the conversion of the certification has not been completed by December 30, 2025, our center will revoke the old version of the standard certification certificate. For certification certificates that have not been converted, our center will revoke the old version of the standard certification certificate.

Comparison of standard requirements between GB/T 36276-2023 version and GB/T 36276-2018 version

Expanded scope of application: This document stipulates the appearance, size and quality, electrical performance, environmental adaptability, durability, safety performance and other requirements of ion batteries for power energy storage (referred to as "lithium-ion batteries"), and describes the corresponding test methods. It stipulates classification and coding, normal working environment, inspection rules, marking, packaging, transportation and storage, etc. Suitable for the design, manufacturing, testing, detection, operation, maintenance and overhaul of lithium-ion batteries for power energy storage.

This standard specifies the specifications, technical requirements, test methods and inspection rules of lithium-ion batteries for electric energy storage. This standard applies to lithium-ion batteries for electric energy storage.

The energy retention and energy recovery capabilities of battery cells and battery modules should meet the following requirements when stored at (45±2)°C for 30 days after initial charging:

a) The energy retention rate should not be less than 95.0%;

b) The charging energy recovery rate should not be less than 95.0%;

c) The discharge energy recovery rate should not be less than 95.0%.

Battery cells are stored for 7 days and battery modules are stored for 28 days. The room temperature and high temperature energy retention and energy recovery capabilities of battery cells, batteries, and battery modules should meet the following requirements:

a) The energy retention rate is not less than 90%;

b) The charging energy recovery rate is not less than 92%;

c) The discharge energy recovery rate is not less than 92%.

The charge and discharge recovery rate of battery cells during storage is increased to 96.5%

When the battery cells are discharged to 50% energy state and stored at (50±2)℃ for 30 days, the storage performance should meet the following requirements:

a) The charging energy recovery rate should not be less than 96.5%:

b) The discharge energy recovery rate should not be less than 96.5%.

When the battery module is discharged to 50% energy state and stored at (50±2)℃ for 30 days, the storage performance should meet the following requirements:

a) The charging energy recovery rate should not be less than 97.0%;

b) The discharge energy recovery rate should not be less than 97.0%.

The standard is storage at 45±2°C for 28 days. The storage performance of battery cells and battery modules should meet the following requirements:

a) The charging energy recovery rate is not less than 90%;

b) The discharge energy recovery rate is not less than 90%.

The cycle performance of battery cells and battery modules under (45±2)℃ and rated power conditions should meet the following requirements:

a) The average energy loss per cycle of charging should not be greater than the rated value of energy loss per cycle calculated based on the number of rated power charge and discharge cycles;

b) The average discharge energy loss per cycle should not be greater than the rated energy loss per cycle calculated based on the number of rated power charge and discharge cycles;

c) The energy efficiency difference between cycle charge and discharge should not be greater than 2%.

During the cycle of charging and discharging of the battery module, the average battery cell voltage difference at the end of charging and discharging should not be greater than 250mV or 350mV.

The cycle performance of energy-type battery cells and battery modules should meet the requirement that when the number of cycles reaches 1,000 times, the charge and discharge energy retention rate is not less than 90%.

2. Add 6 new safety performance requirements in the 2023 version

In the electrical performance, power characteristics are added, requiring that the charging and discharging energy of battery cells and battery modules at different charging and discharging powers at (25±2)°C should not be lower than the nominal value of charging and discharging energy under this power.

In terms of environmental adaptability, the initial charge and discharge energy at high altitudes is increased. It is clear that in high altitude environments, the initial charge and discharge energy of battery cells at (25±2)℃ and rated power conditions should meet:

a. The initial charge/discharge energy should not be less than the rated charge/discharge energy;

b. The initial charge and discharge energy efficiency should not be less than 93.0%;

c. The initial charge/discharge energy range should not be greater than 4.0% of the average initial charge/discharge energy.

In terms of safety performance, overload performance, vibration performance, liquid cooling pipeline voltage resistance performance, high altitude insulation performance, high altitude voltage resistance performance, safety protection performance requirements and test methods are added.

Overload performance

When the battery cells are charged and discharged under the conditions of 4Prc and 4Prd', they should not leak, smoke, catch fire, explode, or rupture at locations other than explosion-proof valves or pressure relief points.
The battery module is charged and discharged under the conditions of 4Prc and 4Prd'. There should be no leakage, no smoke, no fire, and no explosion. (Prc: hourly rate rated charging power, Prd': hourly rate rated discharge power)

Vibration performance

After the battery module is initialized and charged, it vibrates in the three directions of Performance shall meet the requirements of 5.6.1.6.1.
5.6.1.5.1 Insulation performance: The ratio of the insulation resistance to the nominal voltage between the positive electrode of the battery module and the external exposed conductive part, and between the negative electrode of the battery module and the external exposed conductive part, shall not be less than 1000 Ω/v.
5.6.1.6.1 Voltage resistance performance: When the corresponding voltage is applied between the positive electrode of the battery module and the external exposed conductive part, and between the negative electrode of the battery module and the external exposed conductive part, breakdown or flashover phenomena and leakage current should not occur. Should be less than 10mA.

Liquid cooling pipeline pressure resistance

After the pressure in the liquid cooling pipeline of the battery module and battery cluster reaches (600±5) kPa, the air pressure drop in the pipeline should not be greater than 50kPa within 1 hour, and the liquid cooling pipeline should not rupture.

High altitude insulation performance

In high-altitude environments, the insulation performance of battery modules and battery clusters should meet the insulation resistance between the positive electrode of the battery module and battery cluster and the external exposed conductive part, and the insulation resistance between the battery module and the negative electrode of the battery cluster and the external exposed conductive part. The voltage ratio should not be less than 1000 Ω/v.

High altitude pressure resistance

In high-altitude environments, the voltage resistance performance of battery modules and battery clusters should meet the requirements of battery modules. Corresponding voltage is applied between the positive electrode of the battery cluster and the external exposed conductive part, and between the battery module, the negative electrode of the battery cluster and the external exposed conductive part. Breakdown or flashover should not occur, and the leakage current should be less than 10mA.

Security protection performance

When the voltage, current, temperature, voltage range, temperature range, insulation resistance and other parameters reach alarm values ​​during the operation of the battery cluster, an alarm signal should be issued and corresponding protection actions should be performed.

Changes in rate charge and discharge performance requirements

The technical requirements corresponding to power type batteries have been deleted.
The energy retention rate and energy efficiency of the battery cell only retain the requirements under the conditions of 2Prcn and 2Prdn', and the energy efficiency requirement of the battery cell under the conditions of 2Prcn and 2Prdn' is increased from 85% to 90%;
The requirement that the energy retention rate of the battery cell's charge/discharge energy under the conditions of 4Prcn and 4Prdn' relative to the charging energy under the conditions of Prcn and Prdn' is not less than 90% is deleted;
The requirement that the energy efficiency of the battery cell under Prcn and Prdn' conditions, and 4Prcn and 4Prdn' conditions is not less than 90% and 80% respectively is deleted.
The energy retention rate and recovery rate are not less than 95% after 30 days of storage at (45±2)℃.

Add and change multiple test methods

In terms of testing, "test device" was changed to "test equipment", and the test equipment requirements were changed (see 6.1.2. A.1.2 of the 2018 version); "test sample preparation", "test line connection" and "test parameters" were added "Setting" requirements (see 6.2.1, 6.2.2.6.2.3). The "low pressure test" and "heating test" test methods have been deleted.
The external circuit resistance value in the "Short Circuit Performance Test" (see A.2.14 and A.3.15 of the 2018 edition of 6.7.1.4.) and the extrusion force in the "Extrusion Performance Test" (see A. of the 6.7.1.4.2018 edition) have been changed. .2.15, A.3.16), drop height in the "drop performance test" of the battery module (see 6.7.1.4. A.3.17 of the 2018 version).
The test method of "salt spray performance test" has been changed (see A.3.18.1 of 6.7.3.1.2018 version); the test method of "thermal runaway performance test" has been changed, and the thermal runaway test method after cycle performance test has been added (See A.2.19 of the 6.7.4.2.2018 version); Changed the test method of "Thermal runaway diffusion performance test" (see A.3.19 of the 6.7.4.3.2018 version); Changed the "factory inspection" (see 7.2. 6.2 of the 2018 edition) and "type inspection" (see 7.4.6.3 of the 2018 edition). The requirements for "marking" (see 7.1 of the 8.1.2018 edition), "packaging" (see 7.2 of the 8.2.2018 edition), and "transportation" (see 7.3 of the 8.3.2018 edition) have been changed.
The test method of "Alternating Humid Heat Performance Test" is added (see A.3.18.2 of the 6.7.3.2.2018 version); the "sampling inspection" rule is added (see 7.3).