Title:
BATTERY MANAGEMENT SYSTEM WITH REAL-TIME AC-IMPEDANCE INSPECTION USING LIMITED-ENERGY ON-BOARD AC EXCITATION
Document Type and Number:
WIPO Patent Application WO/2023/130590
Kind Code:
A1
Abstract:
A Battery Management System (BMS) inspects a battery pack using AC impedance. A controller of the BMS generates a pulse modulation signal to an on-board excitation regulator such as a synchronous buck converter, modulates a limited energy unit such as a capacitor by controlling a frequency sweep of a modulation signal. The capacitor modulation signals are applied to a terminal of the battery pack as an AC excitation. Synchronous sampling circuit obtains a voltage of the battery pack in response to the AC excitation signal. An AC excitation signal current and a response signal battery voltage are processed and Fourier-transformed to generate a corresponding Nyquist plot. Curve shifts can indicate wornness of battery cells. The capacitor generating the AC excitation signal draws little energy from the battery pack so AC impedance inspection can occur during all modes: charging, discharging, and idle modes without an external power supply.
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Inventors:
DING WENLONG (CN)
CHEN MENG (CN)
SUN YAOFENG (CN)
CHEN MANXIN (CN)
CHEN MENG (CN)
SUN YAOFENG (CN)
CHEN MANXIN (CN)
Application Number:
PCT/CN2022/082519
Publication Date:
July 13, 2023
Filing Date:
March 23, 2022
Export Citation:
Assignee:
HONG KONG APPLIED SCIENCE & TECH RESEARCH INST CO LTD (CN)
International Classes:
H02J7/00; G01R31/389; H02M3/158
Foreign References:
| CN114731053A | 2022-07-08 | |||
| US20210391741A1 | 2021-12-16 | |||
| CN112630674A | 2021-04-09 | |||
| CN105391116A | 2016-03-09 | |||
| CN103884995A | 2014-06-25 |
Attorney, Agent or Firm:
IDEA INTELLECTUAL (SHENZHEN) IP AGENCY (CN)
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