公开(公告)号：US20240353499A1

公开(公告)日：2024-10-24

申请号：US18758033

申请日：2024-06-28

Applicant: BYD COMPANY LIMITED

Inventor： Xiaoqian LI ,  Tianyu FENG ,  Linwang DENG ,  Jingjing HONG

IPC: G01R31/392 ,  G01R31/3835 ,  H02J7/00

CPC classification number: G01R31/392 ,  G01R31/3835 ,  H02J7/0047

Abstract: A method for determining a battery capacity, includes: acquiring a first inflection voltage, a first inflection electric power, a second inflection voltage, and a second inflection electric power of the battery, charging the battery and recording a first charging profile of the battery; determining a target inflection point of the battery according to the first charging profile; detecting the electric power until the charging is completed, acquiring a first charged electric power of the battery when the battery is charged to a first inflection point, and acquiring a second charged electric power of the battery when the charging is completed; and when the target inflection point includes the first inflection point, calculating a current capacity of the battery according to the first inflection electric power, the first charged electric power, and the second charged electric power. The first inflection voltage is greater than the second inflection voltage.

公开(公告)号：US20240300379A1

公开(公告)日：2024-09-12

申请号：US18669524

申请日：2024-05-21

Applicant: BYD COMPANY LIMITED

Inventor： Linwang DENG ,  Xiaoqian LI ,  Tianyu FENG ,  Jingjing HONG

IPC: B60L58/14 ,  H01M10/42 ,  H02J7/00

CPC classification number: B60L58/14 ,  H01M10/425 ,  H02J7/0047 ,  H02J7/00712 ,  H01M2010/4271 ,  H01M2220/20

Abstract: A battery management method includes: obtaining a current high-voltage inflection point power value of each cell; obtaining a current historical cumulative balance power value of each cell; obtaining a current equivalent self-discharge value of each cell through calculation; obtaining an equivalent self-discharge value at a previous moment of each cell; obtaining a target equivalent self-discharge value of each cell through calculation; determining a maximum target equivalent self-discharge value and a minimum target equivalent self-discharge value; obtaining a maximum equivalent self-discharge rate and a minimum equivalent self-discharge rate through calculation; and when a difference between the maximum equivalent self-discharge rate and the minimum equivalent self-discharge rate is greater than a preset threshold, managing a target cell corresponding to the maximum target equivalent self-discharge value.