Note laptop battery explosion

     Li-ion battery is characterized by thin, high capacity, long life and that is why lithium-ion battery, it has rapidly replaced the nickel metal hydride, nickel cadmium batteries, a portable notebook computers and other equipment for optimal battery life. Recent times, continuously be exposed laptop battery explosion, the laptop battery for the first time into the air waves, the user has this lingering fear, the source of lithium in the end is the power or time bomb?

 

Search study the mystery of the battery fire  Acer Aspire 1640 Laptop Keyboard

 

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

 

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

 

In the multi-level protection mechanism, even in the power charger, laptop computers in an anomalous situation, the laptop battery can only be converted to automatic protection status, if the situation is not serious, often re-plug in after the work can not will explode. the face of the serious laptop battery to explode the fact that journalists ask the power of professionals and a well-known manufacturers of design engineers.

 

According to analysis, nothing less than the Toshiba Satellite A25 Laptop Keyboard  lithium battery explosion caused by a short circuit or overcharge, the biggest one is the possibility of lithium in the manufacture, because the manufacturing process itself flawed, these products may occur at any time there are security risks, such as should be insulation between the two poles of the metal powder or copper foil and aluminum foil membrane perforation burr, resulting in micro short circuit. The former situation is most serious, it will directly cause a short circuit, and a lot of heat, resulting in vaporization of some of electrolyte will stay large battery case .

 

In addition, there is a rather special case, the power charger or a laptop due to special reasons, the lithium battery to provide instant high voltage / high current leading to severe overcharge, such as charging voltage by a sudden rise to 12.9V 12.6V or even higher, then there will be a high charging current generated within the battery charge current circuit should move off, but some lithium battery charging voltage, over current protection design is weak, this may result in damage to the battery protection IC, thus to protect laptop battery to function and damage, charging over the needle after the pole-chip crystal of lithium metal, piercing point lead to multiple micro-short circuit, causing the battery temperature is gradually increased, until eventually the battery explosion, fire phenomenon, This is a lot of laptop battery “hot” the main reason.

 

Covered with a layer of umbrella

 

At present, protection from the IBM Thinkpad R30 Laptop Keyboard  battery point of view, battery charge in front of some of the traditional chip makers are played most of the programs provided precise control of charging voltage and charging current role in the over-voltage and over-current control does not provide the corresponding solutions. Thus, the protection of the battery is completely dependent on the battery itself, such as over charge protection, over discharge protection, over-charging current protection, over discharge current protection, over-temperature protection and so on.

 

Protection in place need to prevent the first-level protection IC MOSFET failure or short circuit caused by over-voltage fault, so the second-level protection IC will generally be considered is the battery pack to protect the last line of defense. In this regard, Bump E (O2 Micro) Product Manager Hong Shizhen expressed different views, he believes that the protection for the battery pack can move forward, additional control functions through the charger to achieve detection and control of the battery charge movements, which undoubtedly will further enhance the level of protection essential to the protection of safe lithium battery.

 

To this end, the O2 Micro power management for Dell Inspiron 1545 Laptop Keyboard portable devices developed by Cool Charge solution which combines the one called Cool Battery Technology battery protection technology, its greatest feature is its traditional chargers generally do not have the OVP (over Voltage Protection) and OCP (Over Current Protection) two battery protection, the technology has been embedded Cool Charge IC chips were.

 

By Cool Charge IC chip, the power charger will largely assume responsibility for battery protection. Under the control of the Cool Charge IC chargers, compared with the conventional design (see Figure 1), the decreased need for external devices , eliminating the need for Q3 and Q4 part of the design, reducing the failure rate. in preserved Q1 and Q2 (device to improve the original design) between, Cool Charge IC set up a detection point, through the factory setting, the detection of voltage and current set points are slightly less than the battery manufacturers to set safety requirements. Thus, in the charging voltage or current beyond the Cool Charge IC set voltage or current value after the security, IC disconnect on the control of Q2, the first battery cut off before the protective effect of charge; from the detection frequency of view, the battery protection level detection time interval of milliseconds, and through the chip to detect, can be very easy millionth of a second level, can be very high frequency continuous detection, in order to achieve the first step to protect the purpose of the battery pack.

 

   Hope that some of the above understanding can help to you, better use of laptop battery

Windows NT 4.0 booting on a PowerPC system. This is the real Windows NT 4.0, booting on real PowerPC hardware. This is not VirtualPC running on a Macintosh. The hardware is an IBM ThinkPad 820, one of IBM’s short-lived “Power Series” computers that were sold as “Personal Computers” rather than workstations. (I also have an “IBM Personal Computer Power Series” that is likewise, a PowerPC-equipped desktop.) After IBM discontinued the “Power Series” attempt, this same basic model of notebook was rebranded as an “RS/6000 Workstation Notebook”. (Much as the “PC Power Series” desktops were really slightly-modified RS/6000-series workstations rebranded.) Windows NT 4.0, all versions, on all discs, contain code not just for standard x86 PCs, but also for PowerPC, DEC Alpha, and MIPS 4×00 RISC processors. It will *NOT* boot natively on a Macintosh, as the hardware support chips and firmware on PowerPC Macs are made solely to boot the Mac OS. Likewise, this PowerPC ThinkPad will *NOT* run the Mac OS, because the Mac OS requires Apple’s custom firmware.
Video Rating: 5 / 5

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