Why are lithium batteries becoming less safer?

Of palm harbor, Florida, USA, a female users iPhone6Plus charge occurs when burning, the company currently has begun investigating the cause of the accident, and this is not the first time apple mobile security accidents.In late January, the company also announced Note7 investigation result of battery, problem is still out on the battery, and the battery provided by the SDI and ATL respectively the cause of spontaneous combustion is different, so will produce in Samsung mobile phone recall and replace the battery again after listing, still cannot solve the problem of the explosion.Earlier, Tesla car collision frequency of spontaneous combustion, early operation occurred more than a Boeing 787The lithium battery a fire accident, BYD electric taxi burst into flames after being rear-ended...

Above all, it seems that the phone battery and unsafe, but the life of people can't leave it again.Lithium-ion batteries as a energy storage tool widely used at present stage, why will the frequent safety accidents in the near future, the future development direction of battery?

Lithium batteries work environment

Increasingly "bad"

The big screen, large memory, high speed processor has become a standard smart phones now.However, more and more big screen and main frequency more and more high multi-core processors are real power users.Samsung Note7, for example, its quad-core processors frequency up to 2.15 GHz, running for 4 gb of memory, in line with the mainstream laptops on market performance, while maintaining the standby and dealing with information and communication, visible for pressure is how big of the battery.

How to improve the standby time?On the premise of system power consumption is constant, increase battery capacity seems to be the only way.The use of different from tesla18650 battery, is widely used in the electronic products lithium polymer battery, that is, a thin films, surface soft block battery.Since there is no hard shell protection, lithium polymer battery very "fragile", excessive extrusion, overheating, internal or external puncture will make it to fire danger of explosion.

Samsung unveiled January 23rd Note7 formal investigation result of the explosion, according to the first batch of battery in the upper right-hand corner appeared extrusion damaged phenomenon, this and released by the third party before the battery size consistent with the conclusion of battery does not match;And the second batch of battery problems because of the "positive electrode welding burrs, Pierce battery lead to short circuit on fire".These two points and it is just the "curse" lithium polymer batteries.

Not only that, more and more electronic devices on the "quick charge" technology has also increased a lot of burden on batteries.Due to rapid current and voltage are much higher than that of normal charging condition, do not rule out have a chance in the power management module problems will cause some dangerous accidents, and frequent use of fast charge also will shorten the life of the battery.

The new method is expected to increase

The lithium battery security

The four main parts as the anode material of lithium-ion batteries, anode materials, isolation membrane and the electrolyte, when internal DCS or hand of lithium ion growth is very easy to cause short circuit or random explosive forming open flame.Once inside the battery formation of DCS, the risk will be rising rapidly, may eventually Pierce is negative isolation membrane.

For avoiding the phenomenon of batteries in the next generation of spontaneous combustion, researchers try to find new ways to prevent fire hazards.Them inside the battery electrolyte are two kinds of new chemicals, one of the components in nitric acid lithium, can improve life, there is also a component of lithium sulfur, can be decomposed electrode.In the process of test, can control the battery internal appear harmless pancake shape product rather than DCS.These two kinds of chemical material also improves the durability of the battery, after 300 cell cycle, battery capacity remains above 99%.

And in lowering the operating temperature of the battery, LG in MWC2017 the G6 conference adopted the computer common copper heat pipe design, will be able to reduce the battery the heat energy produced is understood to be about 10%.At the same time, the design more perfect battery management system can also help the electronic equipment under the condition of the battery overheat frequency reduction in time, for the battery "cool".Although there are a variety of security issues, but before a significant breakthrough in battery technology, all kinds of lithium battery is still good partner in our life.The focus is on the product safety regulators should introduce more perfect battery testing system, at the same time, consumers should be the proper use of lithium batteries, do not trample on batteries extrusion, for heating.

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