Detailed explanation of mobile phone battery
vocational terms usually present cell phone battery Category:
Ni-MH (Ni-MH battery), Li-ion (Li-ion battery ), LiB (fluid lithium-ion battery), LiP (polymer lithium-ion battery.)
the basic parameters of lithium-ion
charge cutoff voltage: 4.2V/4.1V.
phone off voltage: 3.5V (in general)
battery discharge limit: 2.75V/2.7V
( Description: Voltage due to the different batteries of different design process, the new larger capacity battery, mostly 3.7V)
decide the remaining battery capacity of the maximum convenient way is to weigh the voltage (4.2V for example) :
& Wantong Commercial Union to find the altitude business! 4.20V---- 100%
3.95V---- 75%
3.85V-- - 50%
3.73V---- 25%
3.50V---- 5%
; 2.75V---- 0%
the basic parameters of lithium-ion GB/T18287 2000: the 1C rate charging to 4.2V (or 4.1V, C is the nominal capacity, security or milliamperes), the discharge rate to 0.2C to 2.75V (2.7V), the product of current and time because the capacity. Test 5 at a time the time to reach nominal obedience. Related publish, according to citizen standards of hydrogen power GB/T18288-2000: NI-HN battery capacity is charged at 0.4C, 0.2C dimension.
the basic parameters of the lithium ion the wheel life. GB provides life of no less than 300 times. Down to 70% of the substantial battery capacity tin still be used. Note that the battery and use the actual cycle life too in the DOD (depth of discharge) are closely narrated. Because of the quality, accuracy and the use of charge and discharge control habit, the same battery in different people,
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structure of lithium-ion battery from the batteries to protect the perimeter boards, skeletons, packaging components.
lithium-ion battery charging requirements
batteries lithium-ion battery charge and discharge electrode structure on the voltage requirements are very rigid, you must have a constant current and voltage requirements (CC / CV: Constant Currert-Constant Voltage specifications from citizen standards GB/T18287 2000) both of the lithium-ion battery charger. Constant electric current is started charging, the battery voltage increased gradually as the charging process to reach 4.2V (4.1V) inflection point voltage to constant voltage charging, after charging the charge current with saturation to deepen gradually decreases,
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non-lithium-ion battery charger for charging do not have this trait, if used on LION batteries this charger will abbreviate battery life, and even dangerous. The initial battery charge
fashionable battery plant activation method for the semi-battery charging status (to dwindle self-discharge during transportation and storage of the phenomenon),
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battery protection embark and smart battery charging
ingredients among the lithium-ion state of existence, security is very lofty. However, batteries in the overcharge, over discharge caused by high temperature, under interior pressure remains broke or even burst. Battery protection board by electronic devices to invest over-current, over voltage, over-temperature protection features,
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I suggest Hot Beijing mobile altitude 30 yuan, ra, cell phone will show Protection board can be applied to PTC / NTC thermostatic devices automatically repay for temperature elicited volume change and modify the charge current according to the temperature, but also to intelligent control of charging intentions.
of standby time / speak time ingredient
-. call prototype, the specific power consumption of the individual compartment phone, cell phone parameters
-. sim card chip technology process (1.8V process consumes fair a regular sim card, sim card, 3V process 1 / 3)
-. location phone semaphore strength; muscular signal, and base station proximity, communication among mobile phone and base station transfer power to be small.
-. charging method, charging time, charge the battery of lazy time;
-. battery capacity, quality, service life;
-. ambient temperature (near to naught in the low temperature capacity would be dropped.)
batteries for transportation and storage battery in half
ought be allowed to charge (50% half-charged) state. Residual oppression is also low, due to self-discharge behind long-term storeroom to the battery voltage is lower than 2.75V ambition influence battery life, dropped to 2.2V below The full power, the battery is active substances, increased aging and self-discharge, it will also affect life expectancy.
battery articulation
forbidden to steel welding, for high temperatures can cause structural damage batteries, there is a serious hazard of explosion. Should be based on high-frequency welding blot welding.
bulging phenomenon
the process of charging the internal battery will generate a small sum of gas, generally in the discharge digestion. Charge current is too large, constantly over charge will addition gas production, increased pressure within the battery cause a swell phenomenon. Slightly bulging battery is allowed. To avoid overcharging the key to reduce the bulging phenomenon.
lithium-ion battery features light heaviness, capacity ratio, self-discharge slightly (1% / day), charging efficiency (charge input capacity almost equal to the battery output capacity), no memory achieve, no maintenance,
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besides prevalent constant present (CC / CV) approach, a number of senior high-speed charger with dictate capacity, charging time and some only absence 25 minutes or 10 minutes! (Such for the International four-wheel racing mode power cell charger). The conviction is: The high-current charging, charging batteries reach saturation in the gasification point apt sponge the moment produced one instant reversal of the gas expel ... ... continue apt loop until the power cell namely full. In conviction, there is apt test the battery to overcharge accelerated temperature ascend dT / dt usage, a test battery gas saturated fat decreased slightly while the phenomenon of voltage-ΔV way. Monitoring and sampling, computing and control have to be precise with a dedicated LSI chip, GP 1800mah 3 generations of one-hour rapid charger is the-ΔV usage. (NetEase)
Mobile {call} {power cell} {vocational} terms expl
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