CR2450 battery

　　Has CR2450 battery research and development reached its limit?

　　On October 20, an iPhone 7 caught fire in Sydney, Australia, causing a car fire. This caused South Korean media to reflect on the safety of batteries that are widely used in smart terminals: the research and development of lithium batteries may have reached its limit.

　　The hardware configuration of smartphones has been upgraded to a very high level. The CPU computing frequency of the 8-core integrated graphics card of mid-to-high-end smartphones even exceeds that of some PC devices, while the 2K high-definition display screen, 6G running memory, and high-fidelity audio driver are all missing. Not a big power consumer. Mobile smart devices not only bring users a better user experience, but also put forward more radical requirements for battery life.

　　It is currently generally believed that the culprit of frequent fires in Samsung Galaxy Note 7 is its built-in non-removable 3600 mAh lithium battery. Compared with the 1400 mAh battery capacity used in the original iPhone in 2007, the battery capacity of high-end smartphones has increased by more than 2.5 times in the past ten years. Despite this, users are still dissatisfied with the poor battery life of current smartphones. However, in the current situation of providing longer battery life and competing with high-density and lightweight lithium batteries, safety has begun to become a widely discussed topic among the public. In which direction do we need the research and development of lithium batteries to develop, whether it is more efficient or safer.

　　It is understood that from the perspective of usage, lithium batteries are currently divided into two categories: "power batteries" and "rechargeable batteries". The ones used in mobile phones are lithium-ion batteries (Li-ion). Strictly speaking, lithium batteries not only refer to The physical unit of the electrical board also includes an IC circuit module that controls voltage accuracy. Compared with lithium batteries that provide driving power for automobiles and other vehicles, batteries used in mobile devices are smaller and denser, but have relatively high requirements for charging and discharging environments and are more delicate.

　　Samsung and Apple have exploded one after another. Has the research and development of lithium batteries reached its limit?

　　According to relevant information, during the charging of lithium batteries, lithium ions move from the cathode to the anode. When the battery is in use, the lithium ions move in the opposite direction. Between the cathode and the anode is an electrolyte substance that helps ions move and conduct current. To prevent electric ions from moving without the anode and cathode coming into contact, battery manufacturers insert a separator between the two poles.

　　Korean media quoted Professor Kim Dong-won from the Department of Chemical Engineering at Hanyang University as saying, “To increase the capacity without changing the battery volume, we can only make the isolation film thinner, or put more electrode active substances in the anode and cathode, or Increase the maximum voltage that the battery can withstand when charging."

　　“In fact, these two conditions will increase the possibility of battery explosion.” Professor Jin did not accept the argument that all the responsibility should be handed over to the battery supplier. “But the successive fire accidents may be due to the increasing number of functions carried by smartphones. "Caused by overloading the battery", overcharging the battery or charging it too fast may cause the battery to catch fire or explode.

　　Professor Jung Ok-hyun of South Korea's Sogang University also believes that "developed social media has amplified a small number of fire cases, and it is too hasty to discuss whether there are product defects now."

　　Industry insiders believe that "the Korean media's reports on the recent three iPhone explosions may be suspected of diluting responsibility. However, in the reality that lithium battery research and development has reached its limit, it is rational to reflect on safety, which can help improve the search for the true cause of the explosion." reason."

　　According to people in the battery industry, the current battery life of lithium batteries has reached 90% of the limit. In the absence of new material alternatives, it is difficult for smart device batteries to be improved while taking into account both battery life and size. Battery accidents are becoming more and more common. At present, the most important task of the battery industry is not to cover up potential dangers, but to find safety solutions.

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