Why does lithium battery capacity refer to the size of the battery storage capacity?

First electromotive force, the function parameters of your battery capacity, specific energy and resistance.Electromotive force is equal to the charge by the cathode through inside the battery to the positive, the battery of electrostatic force (chemical) the work done.Electromotive force depends on the chemical properties of electrode materials, and the lithium battery the size of the business.Battery can output the total charge for the battery capacity, usually with ampere hour as a unit.In the cell reaction, 1 kilogram of reaction substance what happened as theoretical specific energy of the battery.Battery of internship is smaller than the energy than energy than theory.As the reactants in the battery is not all, according to cell reaction together with the battery internal resistance will cause electromotive force, and therefore often call than high energy battery high-energy battery.The area of the lithium battery is larger, the smaller its internal resistance

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Internship, not only need the battery capacity, many use lithium ion batteries request all occasion of fire had passed on.Traditional supervision over the battery solution is just a voltmeter, does not accurately reflect the capacity of the battery voltage, often appear the voltage is normal, no capacity.Often feel threatened as the use is I do not know the battery can use how long, thus affect the use of many key occasions, also easy to appear misjudgment caused trouble.Thus developed an instrument with which reflect the battery capacity is very necessary.Now have the similar products abroad, but may be due to technical secret elements, not seen to introduce the way to end it.

For electric vehicles using policy, this article puts forward a way to use electricity metering of the end of the battery capacity meter, can be measured battery capacity under certain condition.It according to such a principle, namely the battery charger into energy and released energy calculation and multiplied by the corresponding drop coefficient and indicator of battery capacity (the coefficient should take into account the charging power and battery discharge current size and other factors impact on battery capacity).

The capacity of the battery in addition to some elements from the battery itself, first depends on the charge and discharge, significant assumptions consistent can record the battery charge and discharge capacity can be measured.We conceive of such a call equipped on the traditional single cell battery capacity meter instruments to reach the purpose of the flash capacity.The dynamic supervision and battery capacity meter into the sum of power and total power emitted and intuitive flash after operation.Influence the battery capacity of other elements integrated into a losing coefficient, the coefficient times the charge and discharge amount of work and is the battery capacity left.Because the batteries of different type, size, function, losing coefficient is not the same, the first by test, so don't talk about here coefficient of doubt, only for discussion the end of the measurement circuit of power function.

Lithium battery capacity refers to the size of the battery storage capacity.18650 battery capacity of the unit is "mAh", Chinese name is ma (in measuring large capacity batteries such as lead-acid batteries, for convenience's sake, "Ah" is usually used to indicate that Chinese name is, 1 Ah = 1000 mAh).If the battery rated capacity is 1300 mah, assumed at 0.1 C for battery capacity (C) the discharge current of 130 ma to battery, the battery can last work for 10 hours (1300 mah / 130 ma = 10 h);Assume that discharge current is 1300 ma, the power distribution of time is just 1 hour (internship internship time for battery capacity of individual differences and there are some different).This is ambition condition analysis, digital equipment internship when the current is not perhaps has always been a constant in a certain numerical (digital cameras, for example, working current components such as flashing LCD screen, flash in great changes of open or closed), so the battery to the power supply time only on a device is a about value, and this value is only the practice operation has been measured.

In the chemical battery, chemical energy directly into electrical energy by lithium ion battery internal self-awareness to oxidation and restore the effect of chemical reaction, such as the reaction on the two electrodes, respectively.The cathode active material in the electrolyte by potential is more negative and safe recovery agent, vivid metals such as cadmium, lead, zinc, and hydrogen and hydrocarbons.The positive active material in the electrolyte by potential is positive and secure oxidant, such as manganese dioxide, lead dioxide, nickel oxide, such as metal oxide, oxygen or air, halogen and its salts, oxygen-containing acid and its salts, etc.Electrolyte is excellence with ionic conductivity of the material, such as acid, alkali, salt aqueous solution, organic or inorganic nonaqueous solution, molten salt and solid electrolyte.When open circuit disconnection, although there is a potential difference between north and south poles (open circuit voltage), but there is no current, the chemical energy stored in the battery is not converted to electricity.When open circuit closed, under the effect of the two electrode potential difference is a current through the external circuit.Along with the18650 lithium batteriesInside, due to there is no free electrons in the electrolyte, the charge transfer must be accompanied by north and south poles the oxidation of active material and electrolyte interface or restore reaction, and material of reactants and reaction products to move.

There are many way to battery charging and discharging, constant current, limited negative pulse pressure, pulse, and so on, so briefly by current multiplied by time measurement capability can't habits in addition to the constant flow the other way, and integral method can't habits in the need of negative pulse charging, it will take time together parameters, also not suitable.No matter what kind of charging method, the effects of battery capacity is the key parameters of current and time, the negative pulse charging case only has a negative current.Let's plan for the following work for this way14500 lithium batteries capacity meter circuit, the principle block diagram is shown in figure

Primary monitoring battery charge and discharge current, converts it to voltage signal after the expansion, voltage frequency converter has turned into frequency signal, through certain way to count blink out, this constitutes a battery capacity.Internship, concave and convex represents the size of the current frequency, current frequency is high, at the same time record the pulse number is much, and vice versa.And time is put charge also reflected in the pulse count, the time is long count number.So, using the counting way over to battery charging and discharging amount of computation.

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