CATL and Ningde Runzhi apply for patents related to battery cell welding methods, achieving automatic correction of battery cell welds and improving welding control reliability.

March 29 news, according to information from the National Intellectual Property Administration, Contemporary Amperex Technology Co., Limited and Ningde Amperex Runzhi Software Technology Co., Ltd. have applied for a patent titled “Welding Control Method and Welding System for a Cell.” The application publication number is CN121733118A, the application number is CN202610244737.0, the application publication date is March 27, 2026, the application date is March 2, 2026, the inventors are ZHAO Tongtong, ZHAO Jun, WANG Wencong, WU Ying, and XUE Qiang, the patent agent is Beijing Licheng Intellectual Property Agency Co., Ltd., and the patent agent is Huang Yuxia. The classification number is B23K37/00.

The patent abstract shows that the present invention discloses a welding control method and a welding system for a cell, which are applied in the battery field. After the controller welds the cell’s electrode terminal posts on the first welding equipment according to first welding parameters, it can obtain a welding image of the weld on the electrode terminal posts. Based on the welding image, it obtains the actual offset amount of the contour of the weld relative to the electrode terminal posts, and then, when the difference between the actual offset amount and the standard offset amount is outside the difference range, it automatically compensates the first welding parameters of the first welding equipment based on the actual offset amount, thereby achieving automatic weld alignment correction. Compared with related technologies, the method provided in the embodiments of this application is not affected by human subjective factors, improving the accuracy of determining whether the deviation of the weld contour relative to the electrode terminal posts is relatively large; at the same time, it improves the accuracy of compensating the first welding parameters of the first welding equipment, enhances the accuracy of the correction, and thereby improves the reliability of welding control.

CATL was founded on December 16, 2011, and was listed on the Shenzhen Stock Exchange on June 11, 2018. The company’s registered address and office address both involve Ningde City, Fujian Province. It is a global leading provider of power battery systems, with deep accumulation and high barriers in battery technology, and is highly valuable for investment.

CATL belongs to the Power Equipment - Batteries - Lithium Battery segment in the Shenwan industry classification, involving concepts such as the Kirin battery, solid-liquid batteries, sodium batteries, and others. The company mainly engages in the research, production, and sales of power batteries and energy storage batteries. Its products are used in many fields and scenarios, and it also covers businesses such as battery materials and recycling, with development in both domestic and overseas markets.

In 2025, CATL’s operating revenue reached RMB 423.702 billion, ranking 1/4 in the industry, far exceeding the second-place company EVE Energy’s RMB 61.47 billion, and higher than the industry average of RMB 125.78 billion and the median of RMB 38.341 billion.

Its main business composition is as follows:

In the same period, net profit was RMB 767.86 billion, also ranking 1/4 in the industry, far ahead of the second-place company EVE Energy’s RMB 43.02 billion, and higher than the industry average of RMB 207.23 billion and the median of RMB 30.27 billion.

Ningde Amperex New Energy Technology Co., Ltd.’s recent patent situation is as follows:

According to Tianyancha data, Ningde Amperex Runzhi Software Technology Co., Ltd. was established on October 25, 2021, with the legal representative being Zheng Shu. Its industry is software and information technology services, with a large enterprise size. Registered capital is RMB 320,000 million, paid-in capital is RMB 320,000 million. The registered address is No. 2 Xinkang Road, Zhangwan Town, Jiaocheng District, Ningde City, Fujian Province, Technology Building. Ningde Amperex Runzhi Software Technology Co., Ltd. has invested in 0 companies externally, participated in 2 bidding and tendering projects. Regarding property-related clues, there are 0 trademark information entries, 779 patent information entries, and it holds 5 administrative licenses.

Ningde Amperex Runzhi Software Technology Co., Ltd.’s recent patent situation is as follows:

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