GB/T 47292.3-2026Lithium-ion battery good manufacturing practice - Part 3: Cell process control and finished product testing (English PDF)

3.1 lithium ion cell

A rechargeable device that achieves the conversion between chemical energy and electrical energy through the movement of lithium ions between the positive electrode and the negative electrode.

Note 1.It includes electrodes, separator, electrolyte, container and terminals, etc.

Note 2.Lithium ion cell is also generally referred to as “cell”.

3.2 error-proofing

An engineering technology and management method that prevents errors, defects or accidents occurring in products or systems caused by human negligence, operation errors or unintentional actions from the source through design measures or process control.

3.3 weight loss ratio

Note 1.An indicator characterizing the drying degree of the electrode sheet.

Weight loss ratio = (1 - mass of electrode sheet before drying / mass of electrode sheet after drying) × 100%

Note 2.“Before drying” refers to the electrode sheet after coating and oven drying, which is used as the electrode sheet before drying in the weight loss ratio test.

3.4 bare cell

A semi-finished product assembled by assembling positive electrode sheets, negative electrode sheets and separator films through winding or stacking processes according to specified requirements.

3.5 bare cell forming

A process in which pressure is applied to the bare cell to make it achieve predetermined dimensions and shape.

5.1

According to the overall qualification rate level, comprehensive energy consumption level, comprehensive utilization rate of plant buildings, and semi-finished product/finished product performance indicators of the lithium ion cell production process, such as magnetic foreign matter content, misalignment between the front and back sides of coating, consistency of electrode sheet coating areal density, electrode sheet thickness deviation, capacity consistency, etc., the levels are classified into limited value (Grade C), target value (Grade B) and advanced value (Grade A) based on the current industry level. Lithium ion cell production enterprises shall at least meet the requirements of Grade C.

5.2

Enterprises shall continuously control the production level of lithium ion cells (including but not limited to the indicators listed in 5.1), and shall implement systematic error-proofing for key parameters and materials throughout the entire production process, so as to achieve traceability throughout the product life cycle.

5.3

The applicable scope of key indicators for the lithium ion cell production process is shown in Table 1.

5.4

For other types of cells, the power/energy storage items or consumer items shall be selected according to the process.

Table 1 - Applicable scope of key indicators for lithium ion cell production process and achieve traceability throughout the product life cycle through appropriate data storage. To ensure the reliability of error-proofing and traceability, material identification codes shall meet the following requirements.

a) The coding rules for identification codes of battery materials and semi-finished materials shall be clearly defined according to enterprise requirements and shall be unique;

b) The coding rules for finished product identification codes shall meet the coding requirements of standards such as GB/T 34014 or GB/T 45565.

9.2 Error-proofing

The lithium ion cell production process shall be equipped with automatic identification and interception functions throughout the entire process to prevent nonconforming products from being accepted and released. The error-proofing system shall meet the following requirements.

a) Before production in each process, the system shall automatically verify the material status by scanning the material identification code and intercept nonconforming materials, including battery materials and semi-finished materials;

b) During the production process of each process, the system or equipment shall automatically monitor and determine the key process control parameters and process inspection results of the process. For products determined to be nonconforming, a nonconformity code shall be assigned and the products shall be intercepted.

9.3 Traceability

Lithium ion cells shall have traceability throughout the product life cycle. The traceability system shall meet the following requirements.

a) Traceability information shall at least include the production factory, production line, process steps, production date and production start time and end time of each process, operator information, equipment number, material information, specifications and actual values (including units) of process control parameters, process inspection results (including first inspection), workshop environment (temperature, humidity and cleanliness), etc.

b) Information shall be traceable at all levels from lithium ion cells to semi- finished products and to battery materials.

c) Traceability information shall be uploaded to the system for storage.

d) The retention period of defective image data from CCD inspection of electrode sheets and weld seams shall be not less than 15 days (consumer type) and 3 months (power and energy storage type), respectively. Enterprises may evaluate whether to extend the retention period according to internal quality control requirements or customer requirements. The retention period of digital data shall meet the following requirements.

1) The retention period of consumer lithium ion cells shall be not less than 3 years;

2) The retention period of power/energy storage lithium ion cells shall be not less than the product warranty period or the period required by customers.

11.1 General requirements

The electrode sheet processing for positive electrodes and negative electrodes shall be arranged separately. The workshops for positive electrode sheets and negative electrode sheets shall be completely separated to avoid cross-contamination of dust between positive and negative electrodes. The electrode sheet processing process includes the feeding system, slurry preparation, coating and electrode sheet preparation.

GB/T 47292.1-2026 | GB/T 47292.2-2026 | GB/T 47292.4-2026 | GB/T 45565-2025 | GB 47741-2026 | […]