The Neware WFB-220L-2K is a high-safety explosion-proof chamber designed specifically for "abuse testing" of batteries—such as overcharging, forced discharge, and short-circuit tests—where the risk of thermal runaway or explosion is high. The "2K" in the model name indicates that this unit features two independent testing zones (locations) within a single cabinet.

Explosion-Proof Integrity: (1) Reinforcement Bars: Each zone is fortified with three internal explosion-proof bars (two on the left, one on the right) to prevent cabinet deformation during a pressure spike. (2) Observation Window: Features a multi-layer tempered explosion-proof glass window, allowing you to visually monitor your pouch cells during a test without being exposed to debris. (3) Explosion-Proof Latches: The door uses reinforced "anti-explosion" chains or heavy-duty latches to ensure it remains sealed if a cell vents violently.

Ventilation & Fire Suppression: (1) Forced Exhaust: Each enclosure has built-in ventilation ducts that connect to an external exhaust fan system. This is critical for clearing toxic electrolyte fumes (like HF or CO) immediately after a cell vents. (2) Automatic Fire Extinguishing (Optional): Many configurations include built-in fire spray ports (for CO2 or dry powder) that can be triggered by smoke or heat sensors.

Cable Management Lead Holes: Includes φ90mm lead holes on the rear wall. These holes are fitted with fire-resistant protective grommets to prevent the "cannon effect" (where pressure escapes through the wire holes) during an explosion.

References:

T. Shan, et al., Explosion behavior investigation and safety assessment of large-format lithium-ion pouch cells, Journal of Energy Chemistry, 2022, 72, 241-257. 

T. Shan, et al., Understanding the boundary and mechanism of gas-induced explosion for lithium-ion cells: Experimental and theoretical analysis, Journal of Energy Chemistry, 2023, 86, 546-558.