US 10,890,711 B2
Insulation detection circuit and method, and battery management system
Zhimin Dan, Ningde (CN); Meng Li, Ningde (CN); Yizhen Hou, Ningde (CN); Wei Zhang, Ningde (CN); and Lidan Yan, Ningde (CN)
Assigned to Contemporary Amperex Technology Co., Limited, Ningde (CN)
Filed by Contemporary Amperex Technology Co., Limited, Ningde (CN)
Filed on Jul. 27, 2020, as Appl. No. 16/940,252.
Application 16/940,252 is a division of application No. 16/245,198, filed on Jan. 10, 2019, granted, now 10,763,552.
Claims priority of application No. 2018 1 0102891 (CN), filed on Feb. 1, 2018.
Prior Publication US 2020/0358139 A1, Nov. 12, 2020
Int. Cl. G01R 27/02 (2006.01); F21V 8/00 (2006.01)
CPC G02B 6/0078 (2013.01) [G02B 6/0035 (2013.01); G02B 6/0046 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A battery management system, comprising:
an insulation detection circuit, comprising a first isolation module, a voltage division module, a signal generation module, a first sampling point and a second sampling point, wherein a first end of the first isolation module is connected to a positive electrode of a power battery under detection, a second end of the first isolation module is connected to the second sampling point, the signal generation module is connected to the first sampling point, a first end of the voltage division module is connected to the first sampling point, and a second end of the voltage division module is connected to the second sampling point;
a memory configured to store computer codes; and
a processor configured to execute the computer codes to:
acquire a first sampled signal from the first sampling point and acquire a second sampled signal from the second sampling point when a preset condition is satisfied, wherein the preset condition is the signal generation module generates an AC voltage signal of a predetermined frequency; and
calculate an insulation resistance of the power battery under detection according to the first sampled signal and the second sampled signal.