Why is the lithium battery power display often inaccurate?

The reason why lithium battery power display is often inaccurate? Unify the battery temperature reduction curve, the above is only the battery discharge curve at 15℃ and 25℃, the temperature corresponds to a straight line, the two green dots are the voltage at the same point, and the power seems to be power through the CRT , Voltage, Electricity] [10% error can be formed, so you say it’s okay, you can make several corresponding meters at different temperatures after testing at 5℃, 15℃, 25℃ and 35℃. Before measuring the electrical temperature, Decide which [Voltmeter], do you not deal with this problem? Do you want to make a comparison table of [n temperature × m load × q life point electricity] to represent electricity? This is not an experiment. So low-cost mobile devices don’t want to use coulomb counters, so they shouldn’t be displayed in numbers at all. The cost is high and inaccurate. Of course, the above may not be very complete. Sometimes it is an introduction to the characteristics of lithium batteries. For example, the capacity of lithium iron phosphate batteries is halved at low temperatures (-10°C), and even cannot work at -30°C; why lithium batteries cannot be charged below 0°C; The damage of the battery under overcharge, overdischarge, etc., above the discharge curve of the ternary lithium battery is a ternary lithium battery with a capacity of 2600mAh, 1A discharge, when the discharge curve is at 25℃, the vertical axis is the voltage, and the horizontal axis is the torque. . The mobile phone is processed to acquire a uniform type of battery. The consistency of a good battery discharge curve is almost the same. The percentage of the corresponding voltage point is recorded, and a [voltage-electricity] comparison table can be formed. The measured voltage can correspond to the known The remaining power. This is the principle of voltage fitting. However, we found that the voltage of section A changes greatly with the change of power, and the voltage of section B changes greatly, but the voltage changes little. Therefore, the B segment is more prone to big mistakes. This is one of the reasons why things went wrong. There is another reason that has a greater impact on the error: temperature! One is the coulomb meter. Apple has used the coulomb meter as early as the iPhone 3GS mobile phone to measure the amount of electricity flowing through the phone, so it is accurate. The other is the voltage fitting method to determine the amount of electricity, this method is very wrong. The principles of these two practices are detailed, and you can find some materials to get a general idea. There are two ways to display battery power on mobile devices. Now lithium batteries are used in more and more mobile electronic products. It is also very necessary to display and control battery power, such as mobile phones, how much power, and charging time, will not affect The use of mobile phones, mobile devices of other lithium battery products are also the same. However, the battery level of smartphones seems to be more accurate than a few years ago, but when we use lithium battery-powered products, some battery levels are not so accurate. Why? Disclaimer: Some pictures and content of articles published on this site are from the Internet , If there is any infringement, please contact to delete the previous article: the principle and use of lithium batteries