US 12,282,070 B2
Insulation monitoring method and system for traction battery and apparatus
Weichao Tian, Shanghai (CN); Lei Ye, Shanghai (CN); and Zerun Zhou, Shanghai (CN)
Assigned to NIO CO., LTD., Shanghai (CN)
Appl. No. 17/801,761
Filed by NIO CO., LTD., Shanghai (CN)
PCT Filed Dec. 11, 2020, PCT No. PCT/CN2020/135577
§ 371(c)(1), (2) Date Aug. 23, 2022,
PCT Pub. No. WO2021/169489, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 202010113762.8 (CN), filed on Feb. 24, 2020.
Prior Publication US 2023/0109419 A1, Apr. 6, 2023
Int. Cl. G01R 31/392 (2019.01); G01R 31/36 (2020.01); G01R 31/389 (2019.01)
CPC G01R 31/392 (2019.01) [G01R 31/3648 (2013.01); G01R 31/389 (2019.01)] 13 Claims
OG exemplary drawing
 
1. An insulation monitoring method for a traction battery, the method is performed by a backend server, wherein the method comprises:
obtaining, by taking a current moment as a starting time, each insulation resistance value of the traction battery that is received within a first preset time period before the current moment;
wherein the traction battery is the traction battery of an electric vehicle, and the insulation resistance value is the insulation resistance value of the traction battery detected in real time by a battery management system in the electric vehicle;
collecting data statistics on the obtained insulation resistance values, and analyzing, based on a data statistical result, whether the traction battery has a risk of insulation deterioration; and if the traction battery has the risk of insulation deterioration, outputting first alarm information to the electric vehicle;
wherein before the step of “collecting data statistics on the obtained insulation resistance values”, the method further comprises:
step S1: determining whether a quantity of the obtained insulation resistance values reaches a preset quantity threshold; and if the quantity of the obtained insulation resistance values reaches the preset quantity threshold, performing the step of “collecting data statistics on the obtained insulation resistance values”; or if the quantity of the obtained insulation resistance values does not reach the preset quantity threshold, performing step S2; and
step S2: extending the current first preset time period based on a preset extension time, re-obtaining, by taking the current moment as the starting time, insulation resistance values received within an extended first preset time period before the current moment, and then performing step S1.