Samsung Note7 Continuous Explosion Apple Develops Solid-state Batteries
Author: Source: Datetime: 2016-11-14 15:07:57
A diaphragm defect causes an explosion
Right now, the vast majority of smart phones are used lithium-ion battery. From the working principle, the battery on both sides of the general will have two electrodes, containing a positive ion called the cathode, containing negative ions is the anode. Lithium ions move from the cathode to the anode as we charge the cell phone; when we use a cell phone, that is, to release power, the lithium ion moves from the anode to the cathode, moving in the opposite direction. There is an electrolyte between the two chemical substances, can effectively help the ion mobile, conduction current. However, it is noteworthy that, even if the ion moving constantly, but the yin and yang poles itself is absolutely can not touch, so the general battery manufacturers will be inserted between the yin and yang between the partitions to ensure safety. Once the partition problems, there will be the possibility of an explosion.
In the Galaxy Note7 explosion, the Samsung is given the explanation is: partition defective, battery yin and yang touch the two poles together, causing an explosion. In the industry view, this may be behind the battery manufacturers will push the technology to the limit results. With the smart phone screen is growing, more and more features, the battery life requirements are higher and higher, and in the mobile phone battery life is no greater breakthrough, the manufacturers can only battery life As well as the charging speed to achieve the ultimate.
For example, in order to enhance the battery size and energy density to extend battery life, manufacturers will be between the poles thinner diaphragm material, but may be because of poor quality control, material is not good, or other reasons, resulting in partial thinning of the diaphragm , Can not effectively isolate the positive and negative. At this time, it is easy to lead to battery accident. This time, the replacement of the "security" Note7 is still frequent explosions, Samsung finally could not stand the pressure.
If Samsung completely stopped selling Note 7 phone,Including replacement of some of the other costs, the recall loss will be immeasurable. Industry experts believe that the battery separator design, to consider two aspects. The first is the battery isolation membrane between the positive and negative poles in the amount of extension is not enough, there is a special term called Overhang. This safety margin of the design, first of all to prevent the expansion and contraction in the cell when the battery can have enough margin to ensure the positive and negative poles completely isolated. Second, in order to ensure that water removal process in the batteries, the diaphragm will become too short because of thermal contraction, so that affect the insulation. In addition, it is a foreign matter carried by the separator itself. Because the finished product into the battery before the production line is like a bundle of bundles of tape, so it is easy to stained with some small particles, such as dust, staff operations fall particles, and even battery anode material particles and many more. These particles are likely to puncture the isolation film, after all, the thickness of the film is only between 20 to 30 microns, especially in automotive power batteries, often between 20 to 25 microns.
Battery market three pillars
Cell phone batteries are divided into nickel batteries and lithium batteries. Among them, the nickel battery capacity is low, there is memory effect, and there is self-discharge phenomenon, and manufacturing materials and environmental pollution problems, so the mobile phone industry did not continue down. The lithium battery to make up for the shortage of nickel batteries, and its high-energy, environmentally friendly features, making it the only source of power for mobile phones. The lithium batteries are usually divided into two categories. The lithium metal battery is generally a battery using a manganese dioxide as a cathode material, metal lithium or its alloy metal as an anode material, and a nonaqueous electrolyte solution. Lithium-ion batteries are generally used lithium metal oxide as cathode material, graphite as the anode material, the use of non-aqueous electrolyte battery.
Although the lithium metal battery energy density, theoretically can reach 3860 watts / kg, but because of its nature is not stable enough and can not be charged, it can not be used repeatedly as a power battery. The lithium-ion battery because of the ability to repeatedly charge, as the main power battery development. But because of its different elements, composed of cathode materials in all aspects of performance vary widely, leading to the industry on the cathode material line disputes. Generally speaking, the main power battery lifepo4 batteries, lithium manganese batteries, lithium cobalt oxide batteries and ternary lithium batteries (ternary nickel and cobalt manganese).
Lithium cobalt oxide batteries used in mobile phones and notebooks more. Lithium manganese battery, the Japanese car with this, such as Nissan. Lithium manganese oxide battery than the safety of lithium cobalt oxide batteries better, because lithium cobalt oxide batteries in order to pursue energy density, storage power to be more, although it also knows that it has some security problems, but the risk of danger is very low, The whole industry, the world is still inclusive of it. But the car is not the same, the safety of the car is very important, so the power will do something to give up, like the safety of lithium manganese oxide than lithium cobalt oxide battery is better, but the energy density is not so big, on the other hand Lithium manganese battery is more powerful attenuation.
Samsung SDI is a subsidiary of Samsung Group, lithium battery is one of the main business, in 2014 began to develop mobile phones can not be replaced with the battery, but in the Galaxy S6 phone lost to LG, ATL and other competitors. In the Galaxy Note 7 project, Samsung SDI finally supply most of the battery, but did not expect to encounter such a thing. It is said that Samsung's next-generation flagship Galaxy S8 will give up SDI, while the use of LG's battery. However, Samsung and LG signed a definitive agreement, the deal remains to be seen. Samsung and LG in almost all consumer electronics products in the field of competition, from smart phones, home appliances to TV. Fearing technology leaks, the two companies rarely use each other's parts.
Solid-state batteries or become the best choice?
According to foreign media was informed of the latest news, Apple seems to be more than the Samsung Galaxy Note 7 from the event more lessons, and has applied for a battery and user security design patents. "Battery performance for mobile electronics and other computing devices is gaining in popularity, especially as mobile devices get smaller, but their performance needs are growing," Apple wrote in the patent application description. The higher the premise is even more so to maintain the same device size and enhance battery life has become a device manufacturers continue to challenge one.
The patent shows that Apple is developing a technology that will prolong battery life and not explode. The patent focuses on the battery case, even if the battery internal explosion, a special material made of solid shell can also ensure that users are not subject to security threats. At the same time, this new shell technology also allows the shape of the battery can be designed according to the internal structure, somewhat similar to the new Macbook battery structure. In addition, it also reduces the gap between the battery stack to reduce the problem of battery expansion and other issues.
It is noteworthy that, since 2012, Apple has begun to actively layout the patent for all solid-state battery technology, look forward to this new battery can be used in iPad, MacBook and other equipment will be developed later on flexible electronic devices. November 2015, the US Patent and Trademark Office announced Apple's solid-state battery charging technology with a new patent - portable devices, solid-state battery charging technology.
The so-called solid-state battery is no gas inside, no liquid, all materials are solid form of the battery type. Lithium batteries have the chance of bulging, and lithium battery operating temperature range is limited, high temperature or low temperature life are susceptible to, but all solid-state battery is no more than these problems. In the industry view, solid-state batteries may be the next step in the direction of the mainstream of battery development. However, the solid-solid contact between the electrode and the solid electrolyte has higher interfacial contact resistance compared to the solid-liquid contact in the solid-state lifepo4 battery pack, and the interfacial compatibility and stability also significantly affect the solid-state lithium battery Cycle performance and rate performance. In addition, the solid-state battery is also facing the production process to be improved, the cost to be reduced development bottleneck.
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