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Battery pack impedance detection method and device

An impedance detection and battery pack technology, applied in measurement devices, measurement of electricity, measurement of electrical variables, etc., can solve the problems of decreased battery pack service life, inconsistent cell resistance, inaccurate cruising range estimation, etc., and achieves high real-time performance. , the effect of high reliability

Pending Publication Date: 2022-02-08
SAIC MOTOR
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Problems solved by technology

However, the current battery pack solutions are realized by connecting multiple strings of cells in series to form a battery pack, and the inconsistency of cell resistance is inevitable.
Moreover, as the use time increases, this inconsistency will become more serious, which will increase the deviation of the estimation of the battery pack's power and health, which will cause improper control strategies of the battery management system BMS, resulting in a decrease in the service life of the battery pack or Inaccurate mileage estimation

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  • Battery pack impedance detection method and device
  • Battery pack impedance detection method and device
  • Battery pack impedance detection method and device

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Embodiment Construction

[0054] In order to make the above objects, features and advantages of the present application more obvious and understandable, the embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0055] The inventor found in the research of traditional BMS products that traditional BMS products do not calculate the internal resistance of the battery cell. In this case, it will lead to a large deviation in the estimated service life and cruising range of the battery pack, which will cause improper BMS control strategy.

[0056] In addition, the reliability of the high-voltage copper connection in the battery pack gradually decreases with the increase of life. The existing monitoring method is only based on the temperature sensor of the module tab to monitor and judge, and take protection when the temperature is overheated. However, this solution does not 100% monitor the reliab...

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Abstract

The embodiment of the invention discloses a battery pack impedance detection method and device, and the method specifically comprises the steps: injecting an AC signal into a negative electrode of a battery pack when the battery pack is in a static state, and obtaining a voltage signal of each battery cell under the action of the AC signal; for any battery cell, determining the first resistance of the battery cell according to the injected alternating current signal and the voltage signal corresponding to the battery cell; when the battery pack is in a dynamic state, obtaining the dynamic voltage and the dynamic current of the battery cell in the dynamic state, and determining the second resistance of the battery cell according to the dynamic voltage, the dynamic current and the static voltage; and then, carrying out filtering fusion on the first resistor and the second resistor, and obtaining an accurate resistance value of the battery cell through filtering iteration. Namely, when the battery pack is in a dynamic state, the real-time performance is high; in a static state, the reliability is high. Two calculation results obtained through calculation in the two states are subjected to filtering iteration at the same time, so that the accurate resistance value of the battery cell is obtained, and accurate calculation data are provided for calculating the remaining capacity and the health degree of the battery.

Description

technical field [0001] The present application relates to the technical field of batteries, in particular to a method and device for detecting the impedance of a battery pack. Background technique [0002] With the development of new energy vehicles, the requirements for battery packs and battery management systems are getting higher and higher, especially the accuracy and safety of battery management. However, the current battery pack solutions are realized by connecting multiple strings of cells in series to form a battery pack, and the inconsistency of cell resistance is inevitable. Moreover, as the use time increases, this inconsistency will become more serious, which will increase the deviation of the estimation of the battery pack's power and health, which will cause improper control strategies of the battery management system BMS, resulting in a decrease in the service life of the battery pack or The mileage estimate is inaccurate. Therefore, it is very necessary to...

Claims

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Application Information

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IPC IPC(8): G01R31/389G01R31/392G01R31/36
CPCG01R31/389G01R31/392G01R31/3648
Inventor 陆珂伟李骥陈文迪郑华科周翔
Owner SAIC MOTOR
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