An online self-learning lithium battery internal resistance measuring device and its measuring method
A technology for measuring devices and lithium batteries, applied in measuring devices, measuring electrical variables, measuring electricity, etc., can solve problems such as low precision, and achieve the effects of improving accuracy, high robustness, and improving online self-adaptation
Active Publication Date: 2021-03-12
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
These do not require accessory detection devices, and use the data of the static battery to estimate the internal resistance of the battery online, but the estimation will be seriously disturbed and affected by the current battery working conditions, so the accuracy is often low, and there may be cumulative errors
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[0060] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0061] Please combine figure 1 and figure 2 As shown, an online self-learning lithium battery internal resistance measuring device provided by the present invention includes a lithium battery body 1, and also includes:
[0062] The current sensor 2 is used to detect the current signal of the lithium battery body 1 and transmit the parameters of the current signal to the controller 7 . If the current is small, a precision resistance measurement can be connected in series in the battery circuit; if the current is large, a Hall sensor or a shunt can be used for measurement.
[0063] The power sensor 3 is used to detect and calculate the current power of the lithium battery body 1 , and transmit the current power parameters to the controller 7 . Depending on the cost and accuracy, you can choose Ah integration circuit, power m...
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The invention discloses an online self-learning lithium battery internal resistance measuring device and a measuring method thereof, which include a lithium battery body, and further include: a current sensor for detecting the current signal of the lithium battery body; an electric quantity sensor for detecting and calculating The current power of the lithium battery body; the temperature sensor is used to detect the temperature of the surface of the lithium battery body; the cycle counter is used to calculate the number of cycles that the lithium battery body has been used; the controller, through the current signal parameters, current power parameters, temperature Parameters, voltage signal parameters and cycle number parameters are used to calculate the current internal resistance of the lithium battery body; the voltage controller is used to convert the terminal voltage analog signal of the lithium battery body into a digital signal; the calibration load is used to measure the internal resistance of the lithium battery Device online learning and correction. The invention can detect and calibrate the remaining service time of the lithium battery combined with online self-learning and correction offline, and has the characteristics of good robustness, high precision and online self-adaptation.
Description
technical field [0001] The invention relates to lithium battery detection technology, more specifically, to an online self-learning lithium battery internal resistance measurement device and a measurement method thereof. Background technique [0002] The internal resistance of the battery is one of the important parameters of the lithium battery, and it is an important symbol that characterizes key indicators such as the state, power, and life of the lithium battery. Generally, there are three evaluation and measurement methods for the internal resistance of lithium batteries: offline detection, online detection, and online estimation. [0003] Off-line detection is a traditional measurement method, commonly used are HPPC DC internal resistance detection, AC internal resistance detection and other methods. It features high precision and good repeatability, but it is not suitable for online detection of the state of lithium batteries because it needs to meet relatively stric...
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IPC IPC(8): G01R31/389G01R31/367
CPCG01R31/389G01R31/367
Inventor 胡继康徐丽敏申屠理锋刘金龙吕忱奚嘉奇
Owner BAOSHAN IRON & STEEL CO LTD