"Fire extinguisher built-in battery" is devised, how to solve the ignition and explosion problem of the battery?

ByLuke Wroblewski

Lithium-ion batteries are used for many devices ranging from electric cars to smartphones, but oftenExplosion accidentIt is also known to cause. In 2016 Samsung'sExplosion followed one after another in Galaxy Note 7, Eventually it developed to a recall of 1.3 million units scale. In January 2017The cause of the explosion is batteryAlthough it has been found out that it was also found, the research team of Stanford University has devised a "fire extinguisher built-in battery" so that it can be extinguished immediately even if the battery ignites.

Battery with inbuilt 'fire extinguisher' developed - BBC News
http://www.bbc.com/news/technology-38637357


A research team at Stanford University has developed a lithium-ion battery that emits fire-fighting materials to lower the temperature when the battery heats up. The research result is Science magazine ·Science AdvancesAboveRelease, And it is thought that it will make it more safe operation of lithium ion battery which attracted attention even in the explosion problem of Galaxy Note 7.

The research team at Stanford University invented was used as a flame retardantTriphenyl phosphateIs placed in the electrolyte solution of the battery. By enclosing this triphenyl phosphate with an outer wall melting at 150 degrees, when the temperature of the battery rises to a dangerous level, the outer wall melts and triphenyl phosphate is released into the battery to perform fire suppression work It is. In the demonstration test, it seems that it was possible to extinguish the battery with fire in only 0.4 seconds. In the meantime, there seems to be a plan to incorporate triphenyl phosphate inside the battery without an outer wall, but this seems to reduce the performance of the battery greatly.

If the battery cell of the lithium ion battery is rapidly charged too quickly, or if some kind of mistake exists at the manufacturing stage, there is a possibility that the inside of the battery short-circuiting and blowing or exploding. Indeed, even in 2016 alone explosion problems have been reported on Galaxy Note 7 as well as with multiple lithium-ion battery loaded devices.

Samsung announced 1.3 million scale Galaxy Note 7 recall, 92 troubles which have been confirmed so far - GIGAZINE


A case where the iPhone 7 Plus explodes and it reports that the battery has expanded - GIGAZINE


The camera captures the moment when the lithium-ion battery of the disaster rescue robot explodes and flames up - GIGAZINE


"Despite the fact that many devices are powered by batteries, the evolution of battery technology has been slow," said Ian Fogg, a senior analyst at IHS, an American energy information research company. Furthermore, "It is very difficult to increase the battery capacity, there is always a risk of failure," Mr. Fogg said, revealing that advancing battery technology is difficult.