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Thin, high capacity, long life, these are the outstanding characteristics of lithium batteries. For this reason, lithium-ion battery, it has rapidly replaced the nickel-metal hydride, nickel cadmium  hp batterybatteries role as notebook computers and other portable devices optimized for endurance. Recent times, continuously be exposed laptop battery explosion, the laptop battery time and again pushed the cusp, the user has this lingering fear, lithium batteries in the end is a source of power or a bomb?

Find study battery fire mystery

In general, the current notebook lithium battery pack itself has a more complete protection.

It is not only from the string / multiple batteries in parallel composition, itself contains two kinds of circuit board modules: protection circuit substrate (Protection PCB) module and the Smart Battery Gauge Board module, its design includes a set of first-class battery protection protection IC (to prevent battery overcharge, over discharge, short circuit), the second-level protection IC (to prevent a second over-voltage), fuses, LED direction, temperature regulation and other components.

In a multi-level protection mechanism, even in the power charger, notebook computers unusual circumstances, the laptop battery can only be converted to automatic protection status, hp Pavilion dv2000 battery ， hp Pavilion dv6000 battery  if the situation is not serious, often still work after re-plug, not will be an explosion. Laptop battery exploded in the face of serious facts, the reporter sought the advice of professionals, as well as electro-chemical a well-known manufacturers of design engineers.

According to the analysis, lithium batteries is nothing less than an explosion caused by a short circuit or overcharge, the greatest likelihood of a lithium battery in the manufacturing, because of manufacturing process itself flawed, leaving the existence of product safety problems that may occur at any time, for example should be insulation between the poles of metal dust or a copper foil and aluminum foil pierced the membrane of the burr, resulting in micro-short circuits. The former situation is most serious, it will directly result in short-circuit, and a large number of heat production, resulting in vaporization of some of the electrolyte, the battery shell stretch.

In addition, there is a rather special case, the power charger or a laptop due to special reasons, the instant to the lithium batteries provide high-voltage / high current leading to a serious over-charge, such as the charging voltage from 12.6V sudden rise to 12.9V or even higher, when there will be a high charging current generation, the battery should be within the circuit moves to cut off charging current, but because part of the lithium battery charging over-voltage, over-current protection function design is weak, which may lead to the battery protection IC is damaged, so that to protect the laptop battery so that the function of damaged, over-charge on-chip over the posterior pole needle-shaped lithium metal crystal, piercing points, resulted in a number micro-short circuit, causing the battery temperature gradually increased, until eventually the battery explosion, fire phenomenon, This is currently a lot of laptop battery “hot” the main reason.

Add a layer of umbrella cover

At present, the battery protection mechanisms from the point of view, battery charging in front of some of the traditional chip vendors to play most of the programs are precise control of charging voltage and charging current role in the over-voltage and over-current control, and does not provide the corresponding solution.  hp Pavilion DV1000 battery ， hp Pavilion dv4000 batteryIn this way, the protection of the battery pack is entirely dependent on the battery itself, such as overcharge protection, over-discharge protection, over-charging current protection, over-discharge-current protection, over-temperature protection and so forth.

Protection in place need to prevent first-level protection IC failure or MOSFET short-circuit caused by over-voltage fault, so the second-level protection IC will generally be considered to protect the battery group last line of defense. In this regard, Bump E (O2 Micro) product manager for Hong Shi Zhen expressed different views, he believed that the protection for the battery pack can move forward, through the charger additional control functions, to achieve detection and control of battery charging action Undoubtedly, this will further enhance the level of protection, the protection of lithium batteries to use security.

To this end, in the O2 Micro power management for portable devices developed by Cool Charge solution which combines the one called Cool Battery Technology battery protection technology, and its most significant feature is to have a traditional chargers generally do not have the OVP (over Voltage Protection) and OCP (Over Current Protection) function of the two battery protection, this technology has been embedded among the Cool Charge IC chip.

After the adoption of Cool Charge IC chip, the power charger will largely assume the responsibility to protect the battery. Affected by the Cool Charge IC control, charger, compared with the traditional design (see Figure 1), the required external components significantly reduced, eliminating the need for Q3 and Q4 part of the design, reducing the failure rate. In the preserved Q1 and Q2 (components to improve the original design) between, Cool Charge IC set up a detection point, through the factory setting, the detection point voltage and current settings are slightly less than the battery http://www.battery-for-laptop.net/ manufacturers to set safety requirements. Thus, in the charge voltage or current exceeds the Cool Charge IC to set the security after the voltage or current value, IC on the control of Q2 off, first cut off before the battery charge protection; from detecting the frequency point of view, the detection time for battery protection ms interval level, through-chip detection, can be very easy to achieve millionth of a second level, you can use very high frequency of continuous detection, in order to achieve the first step to protect the battery pack purposes

In the 863 field of new materials with the support of the Shenzhen High-Tech Green America Co., Ltd., Beijing University of Technology and other units through the production and sony VGP-BPS2 battery，sony VGP-BPS2A battery research co-operation, broke through the resource utilization of used batteries industrialization of key technologies, establishment of resource utilization of used batteries in the core patented technology system and standard system, the formation of annual recycling of used batteries and other waste, 20,000 tons of nickel cobalt annual output of high-performance cobalt, nickel metal powder production capacity of 2000 tons, and built a recycling technology to produce ultra-fine nickel, cobalt demonstration base powder materials.

Cobalt-nickel metal is widely used in batteries, carbide, stainless steel, petrochemicals, automobile manufacturing, machine tools, etc., cobalt and nickel powders are indispensable in modern industrial metal. China is a poor state of cobalt, cobalt resources of proven recoverable reserves are 40.9 thousand tons, accounting for only 1.03% of the world cobalt resources, while the cobalt resource consumption is 12,000 tons / year or more, accounting for 25% of the world’s consumption; Meanwhile, China is also a lack of resources of the state of nickel, has proven reserves of nickel resources of 232 million tons, accounting for 3.56% of the world, while China’s annual consumption of about 25 million tons, an annual shortfall of 10 million tons. China’s annual lithium ion, nickel metal hydride and nickel cadmium batteries more than 300,000 tons of waste, the amount of used batteries to retain more than 100 million tons of used batteries urgent need to develop resource utilization technologies. In the lithium ion, nickel metal hydride and nickel cadmium battery scrap, there is rich in cobalt, nickel metal, is an important renewable cobalt and nickel resources. The use of used batteries to produce high-end  VGP-BPS2C，VGP-BPS2Bproducts to meet the application requirements of cobalt, nickel powder, can form a virtuous circle of resource recycling.

Grammy Shenzhen Hi-tech Co., Ltd., New Materials Jingmen Grammy Co., Ltd., Beijing University of Technology, Central South University in cooperation for a typical multi-department of waste batteries and nickel-cobalt-waste recycling and high-performance nickel-cobalt-a study of new materials technology solve the performance restoration, revitalization and special structures forming, dismantling / classification, rapid separation and purification and other key technology and process equipment, build the failure to adapt to a variety of waste materials, cobalt and nickel recycling systems and new technology to build an area of 250,000 square meters of production base and research centers, to produce ultra-fine metallic nickel and cobalt powders, spherical nickel hydroxide, box-shaped cobalt oxide and the four spherical cobalt oxide sub-four series of nickel and cobalt powders, fully restored failure of nickel, cobalt material performance. Product cost less than the cost of the original minerals, product performance to meet the auto parts, precision machine tools and battery three different technical standards for the industry, access to national key new products and Hubei, Guangdong brand-name title, replacing some of the imported products has now met the  sony VGP-BPS5 battery，sony VGP-BPS5A battery carbide factory and part of the domestic battery industry’s needs, the annual output value reached 800 million yuan.

In the 863 Program and local governments with the support of the Grammy’s worked in Shenzhen, Hubei has established covering 20 cities, 7 million people of scrap battery recycling network, has assembled 15,000 waste battery recycling boxes, the annual recycling of 3,000 tons of used batteries above, the creation of a demonstration model of waste battery recycling. Green America with used batteries and other “urban mines” Resource Recycling, failure to achieve re-use of cobalt-nickel materials, product upgrades, forming independent intellectual property rights, building a cobalt and nickel metal circular economy industrial chain. This is to promote the development of China’s circular economy and ease China’s shortage of cobalt and nickel resources, reduce environmental pollution of great significance.