How to calculate the capacity of polymer battery?

Source: 2020 - 04 - 11 18:57 hits: time how to calculate the capacity of polymer battery into the 21st century, with the rapid development of industry, polymer battery is known to all is a kind of high quality products, the research on it is becoming more and more deeply. When it comes to study, we think of a question is, how to calculate the capacity of polymer battery? The study found that the first method is to monitor the open circuit voltage of battery, in order to obtain the residual capacity. This is because the voltage of the battery and there is a certain relationship between the residual capacity, can be estimated by measuring the voltage of the battery residual capacity. The limitations of the method is: 1) Battery open circuit voltage and capacity of different manufacturer production relationship is different. 2) Only by measuring the open circuit voltage of the battery when the light, to get more accurate results. However, most applications need to know the battery remaining capacity at work, load current on the internal resistance of the pressure drop will affect the measurement precision of the open circuit voltage. Dispersion of battery internal resistance is very large, and the diffusion will increase with the lifespan of the battery, so it is difficult to compensate error caused by the pressure drop. To sum up, the open circuit voltage method of real-time estimation of the residual capacity of battery in practice and can't achieve enough accuracy, can only provide a rough reference. Another widely used method is by measuring the inflows/outflows the net charge of the battery to estimate the residual capacity of the battery. In this method, total inflows/outflows battery current is comprehensive, net charge is the remaining capacity. The method can achieve satisfactory precision, therefore in high-end applications such as notebook computer has been widely used. There is a general algorithm is the battery capacity lithium battery industry is: the capacity of the material thickness length * width * * factor ( 0. 1 to 0. 12) , the size of the coefficient depends on the size of the ability, ability, the greater the coefficient, the greater the power is smaller, the smaller the coefficient, the algorithm only initial response lithium battery capacity, practical ability depends on the specific product, actuarial ability more accurately. Polymer battery actual capacity calculation is more complex, there is no unified standard, need according to their own actual situation to calculate, such as positive and negative electrode materials