Recently, the ProeM series C&I liquid-cooling ESS cabinet developed by TWS Technology (Anhui) Limited (hereinafter referred to as “TWS Anhui"), a subsidiary of TWS Technology (Guangzhou) Limited (hereinafter referred to as "TWS Technology"), has successfully passed the UL9540A certification test and obtained the safety assessment report from TÜV Rheinland Greater China. This signifies that the ProeM series product meets the highest international safety standards and has obtained the "passport" to enter the US market.

UL9540A test standard is a test method proposed by Underwriter Laboratories Inc. (UL) to evaluate the large-scale thermal runaway fire spread of electrochemical ESS. It is widely recognized across North America and even the whole globe and becomes an iconic industry norm. The UL 9540A includes four levels of fire tests, beginning at the cell level and progressing to the module level, the unit (cabinet) level, and finally the installation level. Each test generates data to evaluate thermal runaway characteristics and fire propagation. The levels of testing are sequentially linked to each other, which makes the potential risk factors in the cycle life of the ESS clearer. In this way, the battery safety is verified in principle, thus ensuring the safety of the system.

When it comes to the ESS, safety is the paramount concern. TWS Technology aims high on the product quality and aligns with top global standard from the beginning of R&D. The passing of TÜV Rheinland UL9540A test manifests the R&D level and comprehensive strength of TWS Technology. It can help TWS ESS products get recognized by local owners, fire protection and other approval units, and promote the products to enter the North American market smoothly. TWS Technology will keep pushing forward and strengthen R&D resource investment and global layout to offer safe and reliable ESS solutions and fuel the low-carbon transition on the global arena.