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Nov 5, 2009
Laptop Battery Application

Laptop computers equipped with the original battery, after a certain period of time after use, there Laptop Battery inevitably be in the standby mode. Some users said: "The depth with repeated charge and discharge method, you can restore the battery performance, which will extend battery life:" I think it would be rather one-sided. 
To understand this question correctly, can begin with the type of batteries used in laptop computers from the beginning. We know that in 1995 brought to a laptop, mainly using nickel-cadmium batteries for power. The battery is in operation, if the charge-discharge method is not correct, the battery will have "memory effect", thereby reducing the actual capacity of the battery to remove this "memory effect" is used many times the best way to charge and discharge depth way. With the advent of nickel-metal hydride batteries, battery capacity improved significantly, but the "memory effect" does not completely eliminate the shortcomings. 
In recent years, lithium-ion batteries in notebook computers is rapidly growing in popularity, thanks to lithium-ion batteries have largely eliminated "memory effect" problem, it is used several times in order to restore the depth of battery charge and discharge efficiency of the method is not applicable. However, lithium-ion batteries, why am I still appear to reduce the capacity of this problem? The main reasons for this situation, is used in laptops and the original lithium-ion battery built-in battery management system in the development process. 
Battery Management: At the present time in notebooks, almost all have adopted "Battery Management" and "charge / discharge control" of the two types of chip-level system of governance. "Battery Management chip" placed in a laptop battery inside the chip for the storage registers are used battery lithium-ion batteries, working temperature, ID, serial number, discount laptop battery and discharge status, to load and unload the accumulated frequency of important information. Data information using this process, in accordance with the actual situation is constantly updated. Notebook built in "chip charge-discharge control, the most important role for monitoring and control of battery charging and discharging process in general. 
Charge: Lithium-ion battery charging process in general, are divided into "fast charge constant current and constant voltage charging current is reduced, two phases. So-called "constant current fast charge" means the charge has only just begun when the charge current is fixed and the charge voltage to follow the battery terminal voltage gradually increases until it reaches the nominal voltage charging. When the battery terminal voltage has reached the standard value, control chip will be automatically transferred to the "Constant current charge reduction" stage, this time charging voltage will no longer continue to grow, and the charge current to follow the battery capacity increases gradually reduced and finally reached zero, and this will complete the entire process of charging the battery. 
At the same time, the process of charging a charge arising from the voltage, current, time curves and other data will be stored in a cell in the memory. "Battery Management IC", is to extract from these data, and is calculated by sampling data, such as battery capacity, which is what we read in BatteryInformation where the cost of Wh. 
Fixed: After repeated charging and discharging the battery after use, its built-in chip in the loading and unloading of data, of course, change. If at this time "chip Battery Management" has been unable to re-read the new, more complete data, it calculated battery capacity is certainly not accurate, and to the user the impression that the battery capacity has decreased, but in reality on the capacity of the battery and there is no real reduction in actual. Some brands of portable computers come with a charger work management software, that is, charging Refresh chip charge-discharge control "in memory of the data, thus providing a" chip Battery Management ", the correctness of calculations. 
If you look closely at the use of portable computers, the instructions, you will find among them "to use the computer in one month later, the battery should be done on a full charge and discharge operation" instructions. Its main objective is to use a depth charge and discharge method of changing the charge and discharge control chip registers inside the curve data, so that the battery power management and minimal power, and the actual state of the battery match to reach the correct values of the battery capacity. 
   
     In need of special note that if the battery cell aging, as well as volume and can not recharge, which can not be more ways to fix the battery can only be through notebook battery replacement batteries, battery Security Council re-cleared data to fix the battery, so that a strong driving force for reach the plant.

Posted at 10:08 am by laptopbattery5