Quality appraisal of nickel-metal hydride battery production equipment

nickel-metal hydride battery production equipment mainly includes batching equipment, slurry mixing equipment, coating equipment, electrode winding equipment, assembly equipment, etc. Among them, the coating equipment is responsible for evenly coating the slurry on the electrode substrate and is a key equipment for the production of high-quality nickel-metal hydride batteries.

Ni-MH battery production equipment is widely used in new energy vehicles, energy storage systems, consumer electronics and other fields. In power battery manufacturing, it is used for continuous coating and slitting of positive and negative electrode sheets; in the battery assembly process, it completes automatic core winding and case packaging; and in the formation process, it ensures battery activation efficiency and consistency. Compared with traditional production equipment, the nickel-metal hydride battery production line has the characteristics of coating thickness deviation ≤±2μm, winding alignment accuracy ≤0.1mm, and injection volume control error ≤±1%. It is the core equipment for the new energy industry to achieve large-scale high-quality manufacturing.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide quality appraisal services for nickel-metal hydride battery production equipment. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for the quality appraisal of nickel-metal hydride battery production equipment.

With the surge in demand for production expansion in the new energy industry, there has been a significant increase in related equipment quality disputes. The judicial dispute focuses on:

1. Dispute over performance indicators: measured coating surface density uniformity, core short circuit rate;

2. Material defects: insufficient corrosion resistance of the stainless steel base roller of the coating machine causes slurry contamination, and swelling of the sealing material of the liquid injection valve body leads to leakage;

3. Process problems: The oven temperature gradient deviation is >±5°C, causing electrode cracking, and the residual oxygen content of the vacuum liquid injection system is >50ppm, which accelerates battery aging;

4. Contract performance disputes: key modules (such as PLC control system version, laser welding machine power) are inconsistent with the technical agreement. Such cases require accurate positioning of quality responsibilities through equipment accuracy verification, material composition analysis and process simulation experiments.

1. Preliminary inspection

Check whether the appearance, nameplate information and functional components of the coating equipment are complete.

2. Coating film thickness measurement

Use a coating thickness meter to measure the thickness of the coating film on the electrode substrate, and compare it with the equipment factory specifications.

3. Coating film uniformity detection

A power battery company of the applicant signed a "Fully Automatic Winding Machine Purchase Contract" with an equipment manufacturer of the respondent, purchasing 5 RW-3000 equipment for power battery production. Three months after being put into production, the battery short-circuit rate exceeded 0.5% (contract requirement ≤0.1%), resulting in batch returns from customers. The battery company accused the equipment of defects in winding accuracy, and the manufacturer argued that the operator failed to replace the winding needles regularly.

Identification and analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information, contract technical agreements, on-site inspection case materials and other data of "Nickel Metal Hydride Battery Production Equipment" and made the following quality analysis opinions:

The radial runout of the winding needle of the equipment involved reached 0.15mm (standard ≤0.05mm), resulting in pole piece dislocation; the surface hardness of the guide roller was only HV400 (required ≥HV600), and the wear groove depth reached 20μm; the resolution of the motion control system encoder was insufficient (0.01mm, protocol 0.005mm).

The appraisal conclusion concluded that the manufacturer failed to control the machining accuracy and hardware configuration according to the agreement, and equipment defects were the main reason for the excessive short circuit rate.

Ni-MH battery production equipment quality appraisal report mainly includes the following contents:

1. Client information

2. Appraisal equipment information

3. Appraisal basis (standards, power of attorney, etc.)

4. Identification method