The 21700 cylindrical battery (diameter 21mm, length 70mm) boasts core advantages such as high capacity, high discharge rate, and long cycle life, making it a key power supply component for energy storage devices, power tools, portable electronics, and outdoor power supplies. It is a popular category in the domestic energy storage accessory market. To legally produce, supply as a complete set, or sell independently in China, the CCC certification is a mandatory threshold that must be met. Unlike the CCC certification for mobile phone chargers, which focuses on electrical safety compatibility, the CCC certification for 21700 cylindrical batteries is more focused on cell safety and charging-discharging stability, aligning with its high-discharge-rate usage scenarios. Products without certification are strictly prohibited from circulation, and violations will face regulatory inspections, fines, and product removal.
Many enterprises producing 21700 cylindrical batteries tend to fall into two core cognitive misunderstandings. Today, these are clarified. Firstly, they mistakenly believe that "21700 cylindrical batteries have the same certification process as 18650 cylindrical batteries and can share the same certification certificate," but in fact, the specifications, capacity, and discharge rate of the two are different, and they need to be separately divided into certification units, and the certificates cannot be mixed. Secondly, they ignore the full process control of CCC certification and think that "completing the type test is equivalent to obtaining certification," but in fact, CCC certification is a complete system consisting of "type test + initial factory inspection + post-certification supervision," which is indispensable. Completing only part of the process cannot legally affix the CCC mark.
Combining the exclusive characteristics of 21700 cylindrical batteries, such as high capacity and high discharge rate, their CCC certification strictly follows GB 31241-2022 "Safety Technical Specifications for Lithium-Ion Batteries and Battery Packs for Portable Electronic Devices," with core control dimensions that align with product usage scenarios. Key aspects include overcharge, overdischarge, short-circuit protection, high and low temperature cycling, compression and impact, and discharge stability at different rates. At the same time, the consistency of the cell, the flame retardancy of the shell, and the performance of the protection board are also verified to comprehensively prevent safety risks such as leakage, fire, and bulging during charging and discharging.
In practice, three common misunderstandings need to be avoided: Firstly,擅自混用18650 battery's CCC certificate， resulting in violations； Secondly， omitting the factory inspection or not completing all items of the type test according to standards， resulting in certification failure； Thirdly， changing the core components or production processes after obtaining certification， and being revoked of the certificate in subsequent inspections. Completing the CCC certification for 21700 cylindrical batteries can not only meet domestic compliance requirements but also enhance product competitiveness， helping enterprises seize the energy storage accessory market.
