CATL applies for a patent related to a battery device, featuring a first connection part to improve the reliability of the battery cell

March 22 News: According to the State Intellectual Property Office, CATL (Contemporary Amperex Technology Co. Limited) has applied for a patent titled “Battery Cell, Battery Device, Power Consumption Device, and Winding Device.” The application publication number is CN121709730A, the application number is CN202610180451.0, published on March 20, 2026, filed on February 9, 2026. Inventors include Zhang Xiaowei, Sun Xiaoyu, Luo Tao, Qin Rongrong, Liu Qinghuan, and Bai Qinglin. The patent agency is Beijing Weifei Lianchuang Intellectual Property Agency Co., Ltd., with patent agent Liu Jie. The classification codes are H01M10/0587, H01M10/0525, H01M10/052.

Patent Abstract: The invention provides a battery cell, battery device, power consumption device, and winding device. The battery cell includes an electrode assembly and a first connection part. The electrode assembly comprises a first electrode sheet, a second electrode sheet, a central needle, and a first separator. The polarities of the first and second electrode sheets are opposite, and the first electrode sheet, the first separator, and the second electrode sheet are all wound around the outer periphery of the central needle. The first separator includes a first substrate and a first coating, with the first coating disposed on the surface of the first substrate facing the central needle. The first connection part is connected to the first substrate and passes through the first coating to connect with the central needle. This arrangement improves the connection strength between the first separator and the central needle. During winding, the first separator is less likely to detach from the central needle, and the first electrode sheet, second electrode sheet, and first separator can be tightly wound around the central needle under tension, reducing the risk of slipping among these components and enhancing the reliability of the battery cell.

CATL was established on December 16, 2011, and listed on the Shenzhen Stock Exchange on June 11, 2018. Its registered and office addresses are both in Ningde City, Fujian Province. It is a leading global provider of power battery systems, focusing on the R&D and manufacturing of power and energy storage batteries. The company boasts advanced technology and a complete industrial chain, making it highly valuable for investment.

CATL’s industry classification is Power Equipment - Batteries - Lithium Batteries, involving concepts such as Kirin batteries, solid-liquid batteries, and sodium batteries. The company mainly engages in the R&D, production, and sales of power and energy storage batteries, with products widely used across various fields and scenarios. It also involves battery materials and recycling, with business coverage both domestically and internationally.

By 2025, CATL’s revenue reached 423.702 billion yuan, ranking first among two industry companies, far surpassing the second-place Boruiwei’s 2.735 billion yuan, and exceeding the industry average and median of 213.219 billion yuan. Its main business, power battery systems, accounted for 74.70%, totaling 316.506 billion yuan. In the same year, net profit was 76.786 billion yuan, also ranking first in the industry, with the second-place Boruiwei at only 54.49 million yuan, well above the industry average and median of 38.42 billion yuan.

Recent patent applications by CATL include:

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