公开(公告)号：US20220357399A1

公开(公告)日：2022-11-10

申请号：US17764340

申请日：2020-09-25

Applicant: BYD COMPANY LIMITED

Inventor： Xiaoqian LI ,  Tianyu FENG ,  Sijia LIU ,  Yonggang YIN ,  Shiwei SHU

IPC: G01R31/367 ,  G01R31/389 ,  G01R31/382 ,  G01R31/374

Abstract: A battery temperature estimation method includes fitting, when a battery is in an offline state, a first function relationship according to corresponding admittances of the battery at different test temperatures, and obtaining a temperature distribution model of the battery according to the shape and the size of the battery, and determining a second function relationship corresponding to internal temperatures and a surface temperature by combining with the first function relationship. The second function relationship is used for estimating the internal temperature of the battery by using the surface temperature and the admittances of the battery.

公开(公告)号：US20230093420A1

公开(公告)日：2023-03-23

申请号：US17994730

申请日：2022-11-28

Applicant: BYD COMPANY LIMITED

Inventor： Linwang DENG ,  Yonggang YIN ,  Tianyu FENG ,  Sijia LIU

IPC: G01R31/3835 ,  G01K1/14 ,  G01K3/00 ,  H01M10/48

Abstract: A warning method for battery thermal runaway includes: acquiring current temperature data of each temperature sensor arranged in a battery pack, current voltage data of each voltage sensor arranged in the battery pack, and current sensor disconnection data of each temperature sensor; calculating a number of occurrences of a primary feature at a current moment according to the current temperature data; calculating a number of occurrences of a secondary feature at the current moment according to the current voltage data and the current sensor disconnection data in a case that the number of occurrences of the primary feature is greater than 0; calculating a sum of the number of occurrences of the primary feature and the number of occurrences of the secondary feature at the current moment; and sending a warning for battery thermal runaway when the sum is greater than a preset feature number threshold.