UL battery certification for lithium batteries is usually divided into two types: UL1642 and UL2054.
UL1642 is a safety testing specification standard for lithium cells first introduced by Underwriters Laboratories (UL) in October 1985. It is the most widely recognized standard for evaluating the safety and reliability of lithium cells under various fault conditions. It primarily focuses ongoing reliability test on cells .
The main testing items of UL1642 certification include ambient temperature short circuit testing, 55-degree short circuit testing, overcharging testing, compression testing, heavy object impact testing, mechanical impact testing, vibration testing, oven testing, temperature shock testing, high altitude simulation testing, and projectile testing.
UL2054 mainly focuses on lithium battery packs or modules. It is applicable to primary (non-rechargeable) and secondary (rechargeable) batteries used as power sources in products. These batteries can be composed of a single electrochemical cell or two or more lithium-ion cells arranged in parallel or series through chemical reactions that convert chemical energy into electrical energy.
The testing items of UL2054 battery certification mainly include electrical testing (short circuit testing, overcharging testing, abuse overcharging testing, overdischarge testing, limited power supply testing), mechanical testing (compression testing, impact testing, acceleration testing, vibration testing), battery pack casing testing, drop impact testing, 250N static load testing, mold pressure release testing, oven testing, projectile testing, environmental testing, high temperature testing, and temperature cycling testing.
UL is mainly divided into three types of labeling: UL marking, C-UL marking, and C-ULUS marking, which are mainly differentiated according to their focus on different national markets.
For example, UL marking is currently the most commonly used, and this type of marking is usually seen in the following types of products: appliances, calculator equipment, stoves and heaters, fuses, power boards, smoke and carbon monoxide detectors, fire extinguishers and automatic water fire extinguishing systems, personal buoyancy devices such as life jackets and lifebuoys, bulletproof glass, and thousands of other products.
C-UL marking is applicable to products sold in the Canadian market. This type of marking can be seen on the following types of equipment: appliances and calculator equipment, vending machines, household anti-theft alarm systems, lighting fixtures, and many other types of products. C-ULUS marking complies with both US and Canadian requirements. UL certificate reports have no expiration date and are maintained through factory inspections and certificate maintenance fees. Factory inspections are conducted quarterly, and audit records are required.