One-sentence answer: Energy storage battery cabinets are exposed to outdoor and coastal environments over the long term. Once a weld seam, explosion-proof valve or liquid cooling connector develops a micro-leak, moisture and salt spray ingress will cause insulation degradation and busbar corrosion. Using the CTS Sentinel C28WE (C28) leak detector to perform vacuum decay or pressure decay overall leak testing on the cabinet cavity is a common solution on energy storage PACK production lines.
Cabinets mostly serve in coastal and industrial park environments. Under the long-term action of moisture and salt spray introduced by micro-leaks, corrosion spreads from the busbar to the cell terminals, and often only becomes apparent months after commissioning.
Coolant inlet/outlet ports, explosion-proof valves, BMS connectors and lifting holes all coexist. The more plugging points there are, the higher the probability that a fixture's own leak is misjudged as a product leak.
The internal volume is large, so after inflation or evacuation, airflow and temperature equalization takes time; insufficient stabilization will cause the judgment value to drift.
Sealing locations: upper cover seal strip compression surface, wall panel weld seams and stitch-welded corners, cold plate through-hole seals, explosion-proof valve and breather valve, BMS connector panel gasket.Consequences of leakage: decreased insulation resistance inside the cabinet, busbar corrosion, accelerated oxidation of metal parts in salt spray environments; in severe cases, insulation alarms are triggered, the entire cabinet is taken off the line for rework, and the cost of on-site replacement far exceeds the cost of interception on the production line.
According to the process agreement. If internal pressurization is allowed and contamination-free testing is pursued, use pressure decay; if the direction of external moisture ingress needs to be simulated, use vacuum decay. The C28WE supports both methods and can switch between them by program on the same instrument.
First ensure reliable plugging and sufficient stabilization, then rely on ambient drift correction and the absolute pressure sensor to offset temperature and atmospheric pressure fluctuations. The C28's built-in correction algorithm is designed precisely for long-cycle, large-volume testing.
Protection ratings usually reference the provisions on IP ratings in IEC 60529 / GB/T 4208, and enterprises define air tightness limits accordingly. The acceptance criteria should be clearly stated in the technical agreement; the instrument is responsible for stable judgment according to the program.
Yes, unless separate criteria are defined for them. The explosion-proof valve and breather valve themselves have a controlled ventilation rate, which appears as a slow and stable pressure change during evacuation or pressurization, different from the continuously declining curve shape of a real leak. Independent parameters should be set for such channels in the program, or they should be temporarily plugged according to process regulations; if they share one limit with the body, a normally breathing cabinet will be judged as defective.
The key to air tightness of energy storage battery cabinets is reliable plugging, resistance to ambient drift, and traceability. The CTS C28WE, with its dual direct pressure/vacuum decay methods and 32 programs, adapts to mixed-line production of multiple cabinet types, and together with custom plugging fixtures forms a stable defense line for energy storage PACK sealing quality.
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