Why are some lithium-ion batteries exploding so far?

Author: Chao Li Yang Pageviews:81 Time:2020-04-22

When the internal electrical components are short-circuited, dropped or mechanical failure occurs after an accident, or the battery blasts due to incorrect installation. All of these problems occur when one side of the battery is heated and cannot meet the conditions of a rapid drop in high temperature, and then leads to a continuous response of more and more heat. This snowball process is generally called thermal runaway.

   This process may occur within a few milliseconds. This has attracted widespread media attention. But it turns out that not all batteries are equally likely to malfunction. As the latest situation on March 15, 2017 shows, any energy storage device is at risk, including a pair of earphones exploding on an airplane. Many batteries have safety hazards, and battery manufacturers should meet safety requirements.

   Even if lithium-ion batteries are safe, they are still used by millions of customers, so problems will definitely occur. One in 200,000 mechanical problems that occurred in 2006 led to the recall of nearly 6 million lithium-ion battery packs (Battery University).

   Li-ion battery experts commented that in rare cases, small metal particles may come into contact with other parts of the battery cell, and then cause a short circuit inside the battery cell.

  So why do people and companies still use them? Lithium-ion batteries are very efficient. They can maintain a large capacity of energy in a small space, and can make electronic gadgets work for a long time. Lithium-ion batteries also rank highly technically. The earliest rechargeable lithium-ion batteries were made for camcorders 25 years ago, and there are now many battery suppliers worldwide.

   However, unlike most advanced technologies, they will change over time. This is mainly because we expect to buy small-package batteries with larger capacity at a low price. The symptoms during blasting may be similar, but many other factors may also cause lithium ion blasting. These include;

   production disadvantages

   Regarding all these blasted batteries, the first diagnosis is that there must be a problem with the way the batteries are made. Many people may think so, but Samsung Note 7 problems indicate that it is not easy to find the key shortcomings. The initial recall touched on devices using batteries made by Samsung, which had insufficient space between the battery maintenance bag and the electrodes. Squeezing tilts the electrodes in some batteries, causing them to short circuit. However, once these devices are recalled, replacing them with a safer battery from another company will encounter different problems. Many are packaged improperly, while others have uneven internal conditions, causing damage to the main separator. This also caused a short circuit, but the reason is completely different.

   Damage to user supply

   Even if the equipment is properly planned, continuous falling and prolonged wear will damage the volatile power. The best way to tell if a battery is damaged is to see if it is all swollen-it proves that the chemicals inside the battery are generating excessive gas. This swelling can also cause its own stress on the battery casing, which may lead to cracking. Unfortunately, many devices today have sealed batteries, and disassembling the device for inspection will void the warranty. If the outer packaging of any device seems to be pushed open or feels unusually hot, it is best to be careful and bring it in for inspection.

  Battery planning process

   In order to follow the trend, most of today's devices are designed to be as thin, light and stylish as possible. This may put pressure on well-made batteries, especially high-capacity batteries in a compact body. The pressure of the hardware around the battery can damage the electrodes and cause a short circuit. Insufficient ventilation or heat management will cause the flammable electrolyte inside the battery to heat up. Once it gets hot, the chemical reaction will heat it up or even more, and get out of control. This condition is called thermal runaway, and it generally results in blasting or fire.

  Professional pressure and competition

   When the company saves a small amount of power on each battery, the company can make billions of dollars in profits. As a result, many lithium-ion battery manufacturers have taken shortcuts to price their batteries at acceptable prices. These materials may not reach the required quality, and then cause damage to the already thin separator. This situation may be the main reason for the hoverboard fire: the first types on the market are expensive, and their popularity has brought fakes with cheap and even cheap internal parts. Crowdfunding and low-priced components have democratized the consumer electronics profession, but savings are often valued in dedication to safety.

   Although a blasted battery sounds scary, it is actually very rare. EEMB is committed to providing its customers with safer lithium batteries through the use of LiFePO4 batteries in various applications. LiFePO4 is a more stable and safer cathode material.


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