21700 cylindrical battery cross-border export | CB certification practical operation guide, essential for global compliance and mutual recognition

The 21700 cylindrical battery (with a diameter of 21mm and a length of 70mm) has become a core power supply component for cross-border export of energy storage equipment, power tools, and outdoor power supplies, and is exported to many countries and regions around the world. For such battery export enterprises, the CB certification is the "universal key" to enter the global market. Unlike UN38.3 which focuses on transportation safety and CCC which emphasizes domestic circulation compliance, the CB certification is an international safety mutual recognition system launched by IECEE (International Electrotechnical Commission Electrotechnical Product Certification and Testing Organization). Its core value is to achieve "one-time certification, multi-country mutual recognition", significantly reducing the compliance costs for cross-border exports and improving the shipment efficiency.

Many friends engaged in the export of 21700 cylindrical batteries have a misconception about the CB certification, often confusing it with other certifications. It should be clear that the core of the CB certification is "international mutual recognition", covering 50+ countries and regions worldwide. After obtaining the CB certification, there is no need to conduct full-item tests in the target country; only local differences tests need to be supplemented to quickly obtain the certification in that country (such as EU CE, US UL, Japanese PSE). While UN38.3 focuses only on the transportation process, CCC is only applicable to the Chinese market. The three have different positioning, and export enterprises need to reasonably combine certifications according to the market demands of the target country.

Combining the high capacity and high rate product characteristics of the 21700 cylindrical battery, its CB certification strictly follows the IEC 62133 international standard, with comprehensive test items covering the core dimensions of battery safety, and taking into account the dual safety of use and transportation scenarios. Core test contents include overcharge, overdischarge, short-circuit protection, high and low temperature cycling, compression impact, vibration tests, as well as rate discharge stability, shell flame retardancy, etc. They comprehensively verify the safety performance of the battery in different usage environments to ensure compliance with the safety entry requirements of most countries in the world.

In practice, three common misunderstandings must be avoided: First, mistakenly believing that the CB certification can replace the local certification of the target country, ignoring the need to supplement local difference tests; Second, sample and production product parameters are inconsistent, resulting in the CB certificate becoming invalid and affecting the subsequent application for local certification; Third, choosing a laboratory without IECEE recognition qualifications, and the report issued by it will not be recognized by the target country. To successfully obtain the CB certification for the 21700 cylindrical battery, it can not only achieve global compliance mutual recognition, but also reduce the compliance costs for cross-border exports and help enterprises efficiently expand the international energy storage accessory market.