US 12,326,477 B2
Method and system for monitoring battery short circuit and apparatus
Weichao Tian, Shanghai (CN); Lei Ye, Shanghai (CN); Zerun Zhou, Shanghai (CN); Hang Yin, Shanghai (CN); Xiang Chen, Shanghai (CN); and Xinchun Lv, Shanghai (CN)
Assigned to NIO CO., LTD., Shanghai (CN)
Appl. No. 17/801,755
Filed by NIO CO., LTD., Shanghai (CN)
PCT Filed Dec. 11, 2020, PCT No. PCT/CN2020/135576
§ 371(c)(1), (2) Date Aug. 23, 2022,
PCT Pub. No. WO2021/169488, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 202010113170.6 (CN), filed on Feb. 24, 2020.
Prior Publication US 2023/0086915 A1, Mar. 23, 2023
Int. Cl. G01R 31/392 (2019.01); G01R 31/3842 (2019.01); G01R 31/396 (2019.01)
CPC G01R 31/392 (2019.01) [G01R 31/3842 (2019.01); G01R 31/396 (2019.01)] 18 Claims
OG exemplary drawing
 
1. A method for monitoring a battery short circuit, comprising:
receiving collected electrical signal information of all cells in each traction battery;
performing self-discharge observation and calculating a self-discharge rate based on a cell voltage in electrical signal information of each cell after depolarization is completed, to determine whether there is an internal short circuit in a traction battery where the cell corresponding to the self-discharge rate is located; and
triggering alarm handling for the internal short circuit in the traction battery based on a back-fed result that there is an internal short circuit in the traction battery;
wherein the receiving collected electrical signal information of all cells in each traction battery specifically comprises:
in a case where the traction battery remains stationary in a battery swap station for a long time, collecting in real time, by a battery swap station-side, the electrical signal information of all the cells in each traction battery stored in the battery swap station, wherein
the real-time collection comprises: collecting the electrical signal information of all the cells in each traction battery during charging and after charging is completed in a case where the traction battery remains stationary in the battery swap station,
wherein the electrical signal information of each cell at least comprises: a single-cell voltage, a current, a temperature, and a state of charge (SOC);
uploading, by the battery swap station-side, the collected electrical signal information of all the cells in the traction battery synchronously to the cloud or a local control device of the battery swap station; and
receiving, on the cloud or by the local control device of the battery swap station, the electrical signal information and storing the information based on a collection time at which the information is collected in real time.