Some original equipment manufacturers (OEMs) are developing special containment housings for safety or alternate mounting locations to mitigate potential smoke or fire hazards. In fact, Stryten Energy developed and tested a box that successfully contained a strong lithium reaction (initiated by multiple penetrating bullets) and then vented the resulting smoke and noxious gasses outside the crew compartment while keeping the battery housing temperature at safe levels.
For the military, a big concern is fire due to ballistic damage, which can occur when a bullet or other projectile strikes the battery, causing a short and a potential fire. This type of failure can pose a serious threat to a soldier. Another, more likely concern is smoke from a damaged battery. If smoke infiltrates the crew compartment, it can quickly overwhelm the occupants. Many of the newer lithium battery boxes have venting schemes to prevent smoke from getting into the cab of the vehicle.
Stryten Energy has been part of the effort to test and ensure the availability of safe, consistent batteries for military use. In the United States, demonstrating compliance with MIL-PRF 32565 is required before a battery can be listed on the military Qualified Parts List (QPL). It is a challenging document and as of this writing, no vendor has shown full compliance, which means no lithium-based 6T battery has been added to the QPL.
The current MIL-PRF-32565 Revision C defines two types and three capacities of batteries, classified based on Ah capacity and the hazard safety level that occurs when the batteries are abused.
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