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Overtemperature Protection that Keeps Higher Current Li-Ion Batteries Safe

The lithium-ion (Li-ion) cell is constructed with materials that are flammable and degradable, and can cause mechanical and electrical shocks resulting in a dangerous thermal runaway condition. In addition, Li-ion cell materials may start to break down when temperatures exceed 130 °C. If a cell starts to enter thermal runaway, the results can be catastrophic.

An integral part of maximizing battery pack efficiency and safe operation is the battery management system (BMS). And, mini-breaker thermal cut-off (TCO) devices are key elements in the BMS protection architecture. Bourns designs its TCO devices to provide accurate and repeatable overcurrent and overtemperature protection. The company’s latest Bourns® Model AC series:

  • Is capable of carrying up to 20 A at 60 °C — the highest current-carrying Bourns® TCO device
  • Has the ability to target specific trip temperature values — 5 trip temperature options, from 72 °C to 90 °C
  • Saves valuable space and weight — compared to Bourns’ previous Model AA series, it is 0.12 mm thinner and 16 percent lighter
The lighter, smaller and higher current capacity advantages provided by Model AC TCO devices are ideal for high-end notebooks, gaming notebooks and tablets. They also help designers extend Li-ion cell usage beyond traditional applications to power tools, electric vehicles, e-bikes and grid storage.

Downloads   Links
 Implementing Overtemperature and Overcurrent Protection    Mini-breaker Training
 Application Note: Bourns® Mini-Breakers - Overcoming Circuit Protection Challenges in Lithium Battery Cell Operated Electronics    Visit the legacy Komatsulite microsite
 Bourns® AC Series Datasheet    
 Bourns® AC Series Design Files    
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