Once lithium-ion batteries end up among other waste and end up on a sorting line, in a bunker, in a container or on a storage bulge, the risk increases rapidly. Consider situations where batteries are:
This can cause a short circuit and sometimes thermal runaway follows: a chain reaction in which the battery heats up extremely quickly, releases gases and can ignite.
Important difference compared to “regular” fires:
In battery incidents, there is often a small, local hot spot first and only later smoke or flame. As a result, conventional smoke or flame detectors are too late in many situations.
A battery fire cannot be “put out with one glass of water” but the underlying lesson is true:
if you get there extremely early, an incident can often be limited to securing a small portion of the equipment, rather than an entire hall/bunker/stockpile.
Early detection means in practice:
detect hot spot → isolate material → controlled cooling/drain → prevent escalation.
Sensor Partners works with thermal sensing that continuously looks for local temperature increases (hotspots) that fit incipient scalding or a damaged battery. By combining this with AI, you can generate alarms faster and with less “noise” in dynamic environments (dust, vapor, changing processes). This is exactly what we offer product-wise through SmartProtectFire: proactive detection of hot spots and smoke.
In waste and recycling environments, you have to deal with dust, vapor, hot engines, solar radiation (outside), hot exhaust streams and varying material flows. Smart analysis helps identify relevant anomalies. Read how AI smoke detection reduces false alarms in industrial settings.
For early detection, a thermal measurement must remain stable, even in dust, temperature changes and continuous operation. RTC self-calibration is an important factor here. Delve into RTC self-calibration for reliable detection.
This solution is often used in places where batteries are most often damaged or where incidents escalate most quickly:
Also read our special page for waste handlers: fire and fume detection in waste processing
With the growth of lithium-ion in the waste stream, proactive monitoring is no longer a “nice to have.” By spotting hotspots early, you prevent a small incident from growing into a major fire with all the operational and financial consequences that entails.
Thermal runaway is usually recognized not by smoke in the first stage, but by rapid local temperature rise around a single point (a cell or battery pack) that can develop in minutes. In waste storage, you often see this as a hot spot in a heap, bunker or container, sometimes with one or more of these signals:
Sudden hot spot: a small area clearly warmer than its surroundings (thermally visible).
Rapidly rising temperature: the hot spot increases in temperature and size in a short period of time.
Gases/“steam” without flame: white or gray emissions can occur (electrolytes/gases), but do not have to.
Hissing/popping noises: in practice sometimes present, but in industrial environments often inaudible.
Reheating after relocation: A damaged battery may reheat even after material has been moved.
Practically the most reliable early indicator: thermal detection of hot spots (preferably 24/7), because thermal runaway often begins before smoke/flame is visible.
Smoke detectors don't always “miss” battery fires, but they are often late or unreliable in waste environments, due to three causes:
Smoke comes later
In lithium-ion incidents, first heat and gas formation. Visible smoke may occur only when it is already escalating or when surrounding material starts to burn along with it.
Smoke remains trapped
An incident often starts at a waste pile/bunker/container. Smoke and gases are not immediately released toward the detector, especially if the source is “packed” between materials.
Industry noise = false reports or attenuation
Waste processing has dust, vapor, exhaust fumes, changing air currents. That makes smoke detection trickier: either you get a lot of false alarms, or you adjust thresholds so that you just alarm later.
Therefore, with lithium-ion risks, an approach at early hot spot detection (temperature drift) often more effective than smoke detection alone.
Broth is an slower heat generation in material (can build up for hours/days), often due to biological/chemical processes or friction/oxidation in waste.
Thermal runaway is an rapid chain reaction in the battery itself (minutes), usually due to internal short circuit or damage, with a chance of flame, gas formation and re-ignition.
In practice, they can reinforce each other: a battery incident can ignite surrounding waste, quickly increasing “brewing/fire.”.
Risk is highest where batteries often ride along or mechanically damaged be, such as:
residual and mixed streams
e-waste / WEEE collection (devices with hidden batteries)
PMD/plastic streams (powerbanks, vapes, toys)
scrap/metal mix (piercing/snapping/impact)
With lithium-ion, these are mainly places with pressure, impact or processing:
transfer points (tire → bunker → container)
press/shredder environment and infeed points
storage bunkers and heaps (with limited ventilation)
containers/transfer outside (heating + invisible source)
areas where material is pushed/poured (shovel/loader)
This helps tremendously, but in practice, batteries continue to hitch a ride (hidden in devices, presented incorrectly, damaged during sorting). That's why prevention + early detection is the realistic combination:
upstream: collection/separation/acceptance policy
downstream: 24/7 hot spot detection + procedures (isolate/quarantine)
