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How to test the true extent of mobile phone battery Toshiba PA3331U-1BRS Battery capacity?

Lithium battery charging method is to limit pressure cross-flow mode, the general charge current are set at 0.2C.

C charge and discharge current tends to be used as a reference, C is the corresponding battery capacity values. MA, said battery capacity tends to be used, such as the L600 battery Toshiba PA3166U-1BRS Battery capacity of 1800mAh, the corresponding C is 1800mA. 0.2C is equivalent to 240mA.

Li-ion battery charge current is generally set at 0.2C, according to this principle, we can charge the battery time to calculate the approximate capacity of mobile phone batteries.

To L600, for example, to calculate the L600 battery Toshiba PA3191U-1BRS Battery capacity: The battery is marked 1800 milliamperes, according to "General Li-ion battery charge current set at 0.2C" calculated, 0.2 × 1800 = 360, the charging time from the L600 run, L600 the battery is full time for nearly 5 hours, 360 × 5 = 1800. This basic calculation out the cell phone battery capacity.

The machine can be seen the capacity of the battery capacity and is in line with annotations.

Many cottage machines, the battery capacity of the target are very large, and some shockingly big, full of quick charging time, and a use of two days of no electricity. In this way, we can easily determine the approximate battery Toshiba PA3285U-1BRS Battery capacity.

Each cell has a resistance. Different types of battery Toshiba Satellite A75 Battery internal resistance. The same type of battery, because of internal chemical characteristics of the inconsistencies are not the same resistance. The battery internal resistance is small, we generally use micro-or milli-Europe Europe unit to define it.
Resistance is a measure of battery performance is an important technical indicators. Under normal circumstances, the battery internal resistance of a small high-current discharge capability, great battery discharge resistance weak.
Months to take the simple example: a single old-fashioned use of 5 digital camera batteries (such as a great power CANON 210), the use of 5 alkaline batteries, you can continuously shoot dozens of photos; but the use of 5 Batteries electricity, only a few would automatically shut down the shoot, but the batteries are not entirely without electricity; then replaced with 5, rechargeable nickel-metal hydride batteries, you can shoot more photos. In the actual measurement later, we can know the internal resistance of nickel-metal hydride batteries "alkaline batteries internal resistance" of the internal resistance Toshiba Satellite A70 Battery of batteries. This example illustrates the application of large current discharge, we must choose a smaller internal resistance of the battery.
In the discharge circuit schematic terms, we can consider the battery and the internal resistance apart, divided into a series with no resistance on the battery a small resistance resistor. At this point if the external load light, then the distribution of the small resistor in the voltage on small, whereas if the external heavy load, then the distribution of the small resistor in the voltage can be relatively large, there will be a part of power is consumed in this resistance on the (possibly converted to heat, or reverse some of the complex electrochemical reaction). A rechargeable battery factory when the resistance is relatively small, but after long-term use, due to the depletion of electrolyte inside the battery, and battery to reduce the internal activity of chemical substances, the resistance will gradually increase, until the resistance of large battery electricity can not be within the normal release, this time the battery can be "end" of the. Most of the aging batteries Toshiba Satellite A100 Battery because of the reasons for excessive resistance caused by non-use value, had to scrap.

First, resistance is not a fixed value.

The trouble is that the battery in different power states, it is not the same as the inner resistance; battery life in a different state, it is the inner resistance is also different.
From a technical perspective, we generally put the battery resistance is divided into two states to consider: charge-state resistance and discharge resistance state.

1, charge-state resistance refers to fully recharge the battery when the battery internal resistance measured by.

2, resistance refers to the battery to fully discharge state after discharge (discharge to the standard cut-off voltage) measured by the battery internal resistance.

Under normal circumstances the resistance is unstable discharge state, the measurement results much higher than normal, while the charge-state Toshiba Satellite A10 Series Battery resistance is relatively stable, measuring the comparative value of practical significance. Therefore, measurement of the battery, we have to charge-state resistance as a measurement of standards.

Second, resistance can not be a general approach to accurate measurement.

Maybe you would say that there is to teach high school physics class with a simple formula for computing the battery internal resistance + resistance box approach. . . . . But the physics textbook to teach the projection algorithm with the resistance box accuracy is too low, can only be used for the teaching of the theory in practical applications simply can not use.

The battery internal resistance is small, we generally Toshiba Portege 4000 Battery use micro-or milli-Europe Europe unit to define it. In general the measurement occasions, we ask that the battery internal resistance measurement uncertainty must be controlled within plus or minus 5%. With such a small resistance, and so must be precise requirements for special equipment to be measured.

Third, the current industry applications, the battery internal resistance measurement method.

Industry applications, the accurate measurement of battery internal resistance is carried out via a dedicated device. Now I say the industry is the application of the battery internal resistance measurement method.

The application of the current industry measurement of battery internal resistance are mainly the following two:
1, DC-discharge impedance measurement.

According to the physical formula R = V / I, test equipment so that the battery in a short time (typically 2-3 seconds) by a large force constant DC Toshiba PA3591U-1BRS Battery current (current general use of high current 40A-80A), measured at this time the battery The voltage at both ends, in accordance with the formula to calculate the current the battery internal resistance.

Such a high accuracy of measurement and control properly, then measurement uncertainty can be controlled within 0.1%.

But this method has obvious shortcomings:

(1) only the measurement of large-capacity battery or batteries, small-capacity battery can not be 2-3 seconds to load 40A-80A high current;
(2) When the battery through the large current when the battery Toshiba PA3506U-1BRS Battery inside the electrode polarization will occur, resulting in polarization resistance. Therefore, measurement of time must be very short, otherwise the measured resistance within a large error;

(3) high current through the electrodes inside the battery on the battery have a certain damage.

2, AC voltage drop resistance measurement.
Because the battery in fact is equivalent to an active resistance, so we put the battery a fixed frequency and a fixed current (the current general use 1KHZ frequency, 50mA low current), then its voltage is sampled, after rectification, filtering and a series of processing adopted after the op-amp circuit to calculate the internal resistance of the battery.

AC impedance measurement of battery voltage drop measurement time very short, generally around 100 milliseconds, almost a finished press the measurement switch on the test. Hehe.

The accuracy of this measurement method is also good measurement uncertainty is generally Toshiba PA3291U-1BRS Battery between 1% -2%.

The advantages and disadvantages of this method:

(1) The use of AC impedance measurement method can measure pressure drop almost all of the batteries, including small-capacity battery. Laptop battery internal resistance of batteries is generally measured using this approach.

(2) AC voltage drop measurement accuracy of measurement is likely to be ripple currents, along with the possibility of harmonic current disturbance. This measuring instrument circuit is a test for anti-jamming capability.

(3) The method has been applied measurements on the battery itself will not have much damage.

(4) AC voltage drop measurement accuracy better than the DC-discharge resistance measurement method. In some resistance on-line monitoring applications, but to use direct current discharge measurement method can not be AC voltage drop measurement.

3, test instrumentation errors and test the components of the battery cable problem.

No matter which method mentioned above, there is some very easily blind us to the question, that is, component test equipment itself, error and the test cable for connecting the battery problem. Because the battery internal resistance to be measured is small, the line of resistance should be taken into account. A short connection from the instrument to the battery cable itself, there are resistance (roughly the same micro-European level), as well as battery and connect the line contact surface contact resistance exists, these factors must all do a good job in the Toshiba PA3356U-1BRS Battery instrument error of the internal pre-regulator .

Therefore, the regular battery internal resistance testers are generally equipped with a dedicated connection cable and battery fixed shelves.

4, sum up.
In fact, many of the aging batteries or a lot of internal power, but released no electrical resistance is too large, the real pity. However, once the battery internal resistance increases, in order to artificially lower the resistance is a difficult period. Therefore, the already aging batteries, even if we find many ways to "activate" it, such as high-current shocks, small current float, Fang Bingxiang. . . . And so on, but mostly useless, beyond resurrection.

Knowledge in understanding the above, we can basically understand the selection of the battery internal resistance as possible selection of a smaller battery. The process of carrying out a combination of batteries (for example, laptop battery packs combinations), we have to use resistance as much as possible the same battery. Another Toshiba PA3250U-1BRS Battery very important point, the battery long time no home, their resistance will continue to increase. Therefore, this handsome guy propose that we still have to frequently use the battery to maintain the activity of chemicals inside the battery. There is not to buy the old batteries, such as disassemble the batteries.

Hehe. After writing so many and hope to all of us some inspiration and help.

Following the August 2007, Nokia BL-5C batteries could overheat, Nokia Fujitsu FPCBP68 Battery decided to give Nokia users worldwide for free replacement of 46 million batteries after the incident, on-line models also be exposed original Nokia 6280 mobile phone (original production) rechargeable batteries and chargers is also prone to cell swell Ershi phone can not close the question, while experts to inspect the defective batteries, the directed swollen extent of "not acceptable" level of risk, an explosion may occur at any time.

In fact, the past, mobile phone battery explosion accidents are often the source of non-original mobile phone batteries, Nokia mobile phone battery explosion could prove a number of international brand-name mobile phone manufacturers original batteries Fujitsu FPCBP77 Battery, do not have the security level, the same risk.

Prior to that, took place in August 2007, Matsushita was found in December 2005 to November 2006 during the production of the Nokia BL-5C batteries could overheat, Nokia decided to give Nokia the world's 46 million users for free replacement battery. News of Nokia in the United States the same day the New York Stock Exchange, shares fell 64 cents to close at 29.84 U.S. dollars per share, down 2%; in Europe, shares also fell 1.55%. Nomura Securities analyst Richard Windsor, estimates that up to the Nokia because the cost of the recall of approximately 137 million.

According to the Hong Kong media reports, the reporter with a question battery Fujitsu FPCBP80 Battery, go to the Nokia shop in Causeway Bay retail outlet inquiries, clerk to explain the charge or side, talking on the phone or by mobile phone songs on, so that power consumption exceeds the amount of charge, for a "pulling power" over many circumstances to make the battery swollen, while the regular overnight charging is also one of the reasons. Pointed out that the staff see the battery, the battery vent plug has been very dangerous, so that's off in real time.

For the above-mentioned explanation, Mr Chung Chi-yuan points out that if the batteries are designed to meet safety standards, there will be three layers of protection devices, "Under normal circumstances," while charging while the phone will never be a problem, cell phone charger will automatically shut down charging is completed current, overnight charging is not a problem. He said frankly that the reporters have discovered how a single block of the same model mobile phone original battery Toshiba Satellite 2100 Battery swollen, can be said that sounded the alarm.

He said that if the battery protection device tolerance set too high, such as the battery under high temperature or high current, short circuit device will not automatically start, the battery will charge the amount of traffic because of the swell, high-speed charging even more high-risk.

"Nokia spokesman for the frontline staff of the claim conflicts with the statement," media reports said Nokia spokesman stressed that they always pay attention to product safety, even if the charge while talking on the telephone or overnight charging, "and will not lead to battery Toshiba Satellite A65 Battery charging and inflation." The spokesman said that due to the staff of reporters retail outlet, they are not present, so will not comment on the staff of the argument.

However, the reporter received a few days after Nokia, the reply, and then go to Nokia's maintenance department, Causeway Bay, to the staff why the battery will charge expansion, the staff also reminded the press should not charge more than two hours all night, or easy to charge inflation. The relevant proposals, there is no battery in the phone description and the guidelines set out.