Popular science: polymer battery capacity calculation formula

In the rapid industrial development in the 21st century, everyone knows that polymer battery is a kind of high quality products, and is now also in further study. How do you calculate the capacity of polymer battery?

The study found that the earliest application method is by monitoring the battery open circuit voltage to obtain the residual capacity.This is because the voltage of the battery and have a certain relationship between the residual capacity, measure the voltage of the battery can estimate the residual capacity.The limitations of this approach are: 1) to the battery of different manufacturers, the relationship between the open circuit voltage and capacity of each are not identical.2) only by measuring the open circuit voltage of the battery when the light can get relatively accurate results, but in the run most applications need to understand the residual capacity of battery, the load current on the internal resistance of pressure drops may affect the open-circuit voltage measurement accuracy.And discreteness of battery internal resistance is very big, and as the battery aging the discreteness will become bigger, so to compensate the error brought about by the pressure drop will be very difficult.To sum up, through the open circuit voltage method to real-time estimation of the residual capacity of battery cannot reach enough precision in practical application, can only provide a general reference value.

Another large application method is by measuring the inflows/outflows the net charge of the battery to estimate the residual capacity of battery.The method of total inflows/outflows battery current points, get the number of net charge is the surplus capacity.This method can achieve satisfactory accuracy, so widely used in laptop computers and other high-end applications.

And there is a kind of battery capacity in lithium battery industry general algorithm is: the capacity of the material length * width * thickness * coefficient (0.1 ~ 0.12), the coefficient of size depends on the size of the capacity, the capacity, the greater the coefficient is larger, the smaller the capacity, the smaller the coefficient, this algorithm can only initial response lithium battery capacity, the actual capacity depending on the specific products, capacity of actuarial more accurately.

Polymer battery actual capacity calculation is complex, there is no a relatively uniform standard, so we need according to their own actual situation to calculate, such as the cathode material, etc

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