Smart Nail Test Developed to Gauge Thermal Runaway in Punctured Lithium-Ion Batteries


Dumb Nails

Dumb Nails

The nail test for lithium-ion batteries is now the “smart nail” test as researchers at Dalhousie University have developed a nail with a heat sensing tip.

Smart Nail

Smart Nail – Follow Source Link For Larger Images

The project, as detailed in the Journal of Power Sources, lists these highlights:

  • A “smart” nail with a thermocouple in the tip is described.
  • Accurate temperature/time curves can be obtained at the site of nail penetration.
  • Easily measure differences in response of Li-ion cells to speed/depth of penetration.

The abstract attached to the article states the following:

“Nail penetration is one safety test that Li-ion cells experience in order to simulate some aspects of an internal short circuit event. To our knowledge, nail penetration is usually performed with an ordinary steel nail. Normally, the only data gathered has been a simple pass/fail result depending on whether or not the cell emitted smoke or flame, along with a thermocouple on the surface of the cell. A “smart nail” has been developed to allow the collection of temperature versus time data at the point of nail penetration. This nail, in conjunction with a thermocouple on the cell surface and tabs on the ends to measure voltage, should provide some new insights into the behavior of cells during this type of abuse testing as well as aid in the developing of safer Li-ion cell chemistries.”

The “smart nail” makes sense to us as it seems one would want to know the temperatures within a punctured battery over time.  This, in a way, can gauge thermal runaway in different battery chemistries and in different pack constructions.

Source: Science Direct

Category: Battery Tech, General

4 responses to "Smart Nail Test Developed to Gauge Thermal Runaway in Punctured Lithium-Ion Batteries"
  1. Taser54 says:

    Nice find, pardon my ignorance, but I’ve never heard of that University.

  2. MarkV says:

    Its in Nova Scotia. And Waterloo is in Ontario. Canadian schools doing a lot of reaearch these days to make advances in battery technology. Proud day for us Canadians!

    1. Taser54 says:

      Thanks, Eh.

    2. Bonaire says:

      Then there is Port Dalhousie at the mouth of the Welland Canal. Home of another “professor” in my favorite band, also out of Canada.

      I wonder how different or supportive this is when integrated into the EUCAR battery test routines?