Do you know what is the relationship between the voltage and the charge of a lithium battery?

Oct 09, 2019   Pageview:10

Lithium ion battery is very useful to power measurement features, is at the time of discharge, the battery voltage with the passage of power will reduce gradually, and there are quite a large slope.This will give us another approximate power measurement way.Take the battery voltage method.Like measuring water tank inside the surface height can be roughly estimated residual water this truth.But, in fact, the lithium battery voltage than water tank inside the calm waters of height measurement is more complicated.Use to estimate the residual capacity of battery voltage instability has the following several: the same battery, under the same under the condition of the residual capacity, change because of the size of the discharge current and voltage value.The greater the discharge current, lower voltage.In the absence of current, voltage is highest;The influence of environment temperature on the battery voltage, the lower the temperature, the same capacity of the battery voltage is lower;Cycle impact on battery discharge platform, with circulation of lithium ion battery discharge platform tends to deteriorate.Reduce the discharge platform.So the same voltage represents capacity also change accordingly;Different manufacturers, different capacity of lithium ion battery, its discharge platform slightly different.

Different types of electrode material of lithium ion battery, discharge platform have bigger difference. Cobalt lithium battery and lithium manganese battery discharge platform is completely different.These can cause the voltage fluctuation and voltage difference, make the battery capacity shows instability, a mobile phone with voltage measurement on the battery capacity, because the mobile phone can't have been in the small current standby state.Temporary large current loss, such as open backlighting, put the bell, especially through, can cause the battery voltage to reduce soon.The phone shows the capacity to reduce more than the actual capacity reduces.When large current, removed the battery voltage will pick up.This can cause cell phone display capacity increases the unreasonable phenomenon.

Battery voltage has been reduced in the process of discharge, such as 3.6 v batteries, 19 ah, 19 ah capacity is not in the 0 v, but 2. A few, or (3) how long, the discharge capacity is 19 ah, if in 0 v, the capacity will be a little more than 19 and discharge, can damage the battery life.

Design, excellent instrument of basically the same cut-off voltage and battery voltage, when the voltage reaches a value, such as 3 v battery is put out, or close to put out, instrument are at the lowest operating voltage, if the instrument of the minimum operating voltage is higher, such as less than 3.6 v will not be able to work, there is a battery and electric, instrument can't work, this kind of circumstance, should improve the external power supply voltage

To calculate the different materials, different shapes of the battery is not the same!Cases of cobalt acid lithium

Charging voltage 3.7 V3.8 V3.85 V3.9 V3.95 V

Charge 7.8% 28.0% 53.0% 59.1% 67.6%

In general, the higher the lithium battery charge and discharge voltage, its capacity.The lithium battery charging and discharging voltage of different material is different.Lithium iron phosphate are the lowest

1. The same battery, under the same under the condition of the residual capacity, change because of the size of the discharge current and voltage value.

The greater the discharge current, lower voltage.In the absence of current, voltage is the highest.

2. The influence of environment temperature on the battery voltage, the lower the temperature, the same capacity of the battery voltage is lower.

3. The circulation influence on battery discharge platform,

As the cycle of lithium ion battery discharge platform tends to deteriorate.Reduce the discharge platform.So the same voltage represents capacity also changed accordingly.

4. Different manufacturers, different capacity of lithium ion battery, its discharge platform slightly different.

5. Different types of electrode material of lithium ion battery, discharge platform have bigger difference.Lithium cobalt and lithium manganese discharge platform is completely different.

These can cause the voltage fluctuation and voltage difference, make the battery capacity shows instability

A mobile phone with voltage measurement on the battery capacity, because the mobile phone can't have been in the small current standby state.Temporary large current loss, such as open backlighting, put the bell, especially through, can cause the battery voltage to reduce soon.The phone shows the capacity to reduce more than the actual capacity reduces.When large current, removed the battery voltage will pick up.This can cause cell phone display capacity increases the unreasonable phenomenon.

Battery voltage of battery capacity form:

Say so many, here is a standard form of the residual capacity of battery voltage (left) and large current is constant exile electric battery voltage form of capacity (right)

100%----4.20V100%----4.20V

90%-----4.06V90%-----3.97V

80%-----3.98V80%-----3.87V

70%-----3.92V70%-----3.79V▲

60%-----3.87V60%-----3.73V

50%-----3.82V50%-----3.68V

40%-----3.79V▲40%-----3.65V

30%-----3.77V30%-----3.62V

20%-----3.74V20%-----3.58V

10%-----3.68V10%-----3.51V

5%------3.45V5%------3.42V

0%------3.00V0%------3.00V

The page contains the contents of the machine translation.

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