Measuring method of remaining power of lithium battery based on voltage tracking
A technology of remaining power and measurement method, which is applied in the direction of measuring electrical variables, measuring power, measuring devices, etc., can solve the problem of unsmooth remaining power, and achieve the effect of solving unsmooth discharge curve, improving estimation accuracy, and strong adaptability
Active Publication Date: 2017-01-18
SINO WEALTH ELECTRONICS
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[0034] Implementation principle of the present invention is first described as follows:
[0035] When the lithium battery cell starts charging and discharging, the system will monitor the current voltage and remaining power in real time. When the cell voltage or remaining power drops to the threshold set by the system, the system will start a voltage tracking module to obtain the rate of change of the voltage and power of the battery (the range of voltage and power changes per unit time). If the voltage change rate R V Less than the rate of change of power R Q , then increase the remaining power accordingly; if the voltage change rate R V and the rate of change of power R Q The same, the remaining power will not be adjusted; if the voltage change rate R V Greater than the power change rate R Q , then reduce the remaining power accordingly. figure 1 That is, the voltage change rate R of the battery cell in the metering method of the remaining power of the lithium battery ...
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The invention provides a method for metering the residual electric quantity of a lithium battery based on voltage tracking. The method comprises the steps of A, performing system charging and discharging; B, estimating the residual electric quantity by a coulomb integral method; C, judging whether a discharging stop condition is met, if so, returning to the step B, otherwise, executing the step D; D, judging whether the voltage of an electric core is lower than a voltage set threshold value for voltage tracking or judging whether the percentage of the residual electric quantity of the electric core is lower than an electric quantity percentage set threshold value for the voltage tracking, if not, returning to the step B, otherwise, executing the step E; E, calculating the voltage change rate and the electric quantity change rate of the electric core; F, comparing the voltage change rate with the electric quantity change rate, if the voltage change rate is smaller than the electric quantity change rate, executing the step G, if the electric quantity change rate is larger than the voltage change rate, executing the step H, and if the voltage change rate is equal to the electric quantity change rate, directly returning to the step B; G, correspondingly increasing the residual electric quantity to enable the electric quantity change rate to be synchronized with the voltage change rate; H, correspondingly reducing the residual electric quantity to enable the electric quantity change rate to be synchronized with the voltage change rate. According to the method, the estimation precision of the residual electric quantity is improved.
Description
technical field [0001] The invention relates to the technical field of measuring the remaining power of a lithium battery, in particular, the invention relates to a method for measuring the remaining power of a lithium battery based on voltage tracking. Background technique [0002] With the popularity of mobile communication products such as smartphones and notebook computers, the development of electric vehicles, and the needs of solar battery applications, before better batteries appear, lithium batteries, as a high-energy secondary battery, will have unique advantages. been widely used for a long time. In many applications, it is necessary to know the remaining power of the lithium battery in real time to estimate the usable time of the battery. [0003] The initial measurement method of the remaining capacity of the lithium battery is to obtain the remaining capacity by monitoring the open circuit voltage of the battery, because there is a definite relationship between...
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IPC IPC(8): G01R31/36
Inventor 刘华伟万清峰
Owner SINO WEALTH ELECTRONICS