阅读说明：本技术 绝缘检测方法、装置、介质及电子设备 (Insulation detection method, insulation detection device, insulation detection medium, and electronic device ) 是由 颜广博 孙博 高攀龙 于 2020-06-29 设计创作，主要内容包括：本公开涉及一种绝缘检测方法、装置、介质及电子设备,以快速、准确地确定动力电池的对地绝缘电阻值。所述方法包括：同时闭合第一开关和第二开关,并在所述第一开关和所述第二开关闭合时,获取所述第一采样点的第一电压和所述第二采样点的第二电压；控制所述第二开关断开；自所述第二开关断开时起、经过第一时长后,再次闭合所述第二开关,并在所述第二开关再次闭合时,获取所述第一采样点的第三电压和所述第二采样点的第四电压；根据所述第一阻值、所述第二阻值、所述第一电压、所述第二电压、所述第三电压和所述第四电压,确定所述动力电池第一极对地的第一绝缘阻值和所述动力电池第二极对地的第二绝缘阻值。(The disclosure relates to an insulation detection method, an insulation detection device, a medium and electronic equipment, which are used for rapidly and accurately determining the insulation resistance value to the ground of a power battery. The method comprises the following steps: closing a first switch and a second switch simultaneously, and acquiring a first voltage of the first sampling point and a second voltage of the second sampling point when the first switch and the second switch are closed; controlling the second switch to be switched off; closing the second switch again after a first time period from the time when the second switch is turned off, and acquiring a third voltage of the first sampling point and a fourth voltage of the second sampling point when the second switch is closed again; and determining a first insulation resistance value of the first pole of the power battery to the ground and a second insulation resistance value of the second pole of the power battery to the ground according to the first resistance value, the second resistance value, the first voltage, the second voltage, the third voltage and the fourth voltage.)

1. An insulation detection method is characterized in that the method is used for an insulation detection circuit, the insulation detection circuit comprises a first sampling circuit connected between a first pole of a power battery and the ground and a second sampling circuit connected between a second pole of the power battery and the ground, the first sampling circuit comprises a first sampling resistor with a first resistance value, a first voltage division branch provided with a first switch and a first sampling point, the first voltage division branch is connected into a circuit with a second resistance value after the first switch is closed, the second sampling circuit comprises a second switch and a second sampling point, the first pole and the second pole respectively correspond to one of a positive pole and a negative pole, and the method comprises the following steps:

closing a first switch and a second switch simultaneously, and acquiring a first voltage of the first sampling point and a second voltage of the second sampling point when the first switch and the second switch are closed;

controlling the second switch to be switched off;

closing the second switch again after a first time period from the time when the second switch is turned off, and acquiring a third voltage of the first sampling point and a fourth voltage of the second sampling point when the second switch is closed again;

and determining a first insulation resistance value of the first pole of the power battery to the ground and a second insulation resistance value of the second pole of the power battery to the ground according to the first resistance value, the second resistance value, the first voltage, the second voltage, the third voltage and the fourth voltage.

2. The method of claim 1, wherein determining a first insulation resistance value of the power cell first pole to ground and a second insulation resistance value of the power cell second pole to ground based on the first resistance value, the second resistance value, the first voltage, the second voltage, the third voltage, and the fourth voltage comprises:

the first insulation resistance value R is determined according to the following formula_p：

The second insulation resistance value R is determined according to the following formula_n：

Wherein R is the first resistance, R is the second resistance, U1 is the first voltage, U2 is the second voltage, U3 is the third voltage, and U4 is the fourth voltage.

3. The method of claim 1, further comprising:

if the first insulation resistance value and the second insulation resistance value are both in the safe resistance value range, determining that the insulation performance of the power battery is good;

and if any one of the first insulation resistance value and the second insulation resistance value is not in the range of the safety resistance value, determining that the insulation performance of the power battery is insufficient insulation.

4. The method of claim 3, further comprising:

recording the ratio of the third voltage to the fourth voltage as a first ratio under the condition that the power battery is determined to be well insulated;

within a preset time period from the second switch being closed again, acquiring a fifth voltage of the first sampling point and a sixth voltage of the second sampling point at a target sampling moment;

determining a ratio of the fifth voltage to the sixth voltage as a second ratio;

and determining the insulation performance of the power battery at the target sampling moment according to the first ratio and the second ratio.

5. The method of claim 4, wherein determining the insulation performance of the power cell at the target sampling time according to the first ratio and the second ratio comprises:

if the difference value of the first ratio and the second ratio is smaller than or equal to a preset threshold value, determining that the insulation performance of the power battery at the target sampling moment is good;

and if the difference value of the first ratio and the second ratio is larger than the preset threshold value, determining that the insulation performance of the power battery at the target sampling moment is insufficient insulation.

6. The method of claim 4, further comprising:

and returning to the step of simultaneously closing the first switch and the second switch after a second time period elapses since the second switch is closed again, and acquiring a first voltage at the first sampling point and a second voltage at the second sampling point when the first switch and the second switch are closed.

7. The method according to claim 3 or 4, characterized in that the method further comprises:

and under the condition that the insulation of the power battery is determined to be insufficient, alarm information is output.

8. An insulation detection device, which is used for an insulation detection circuit, wherein the insulation detection circuit comprises a first sampling circuit connected between a first pole of a power battery and the ground and a second sampling circuit connected between a second pole of the power battery and the ground, the first sampling circuit comprises a first sampling resistor with a first resistance value, a first voltage division branch provided with a first switch and a first sampling point, the first voltage division branch is connected into the circuit with a second resistance value after the first switch is closed, the second sampling circuit comprises a second switch and a second sampling point, the first pole and the second pole respectively correspond to one of a positive pole and a negative pole, and the device comprises:

the first sampling module is used for closing a first switch and a second switch simultaneously and acquiring a first voltage of the first sampling point and a second voltage of the second sampling point when the first switch and the second switch are closed;

the control module is used for controlling the second switch to be switched off;

the second sampling module is used for closing the second switch again after a first time length from the time when the second switch is disconnected, and acquiring a third voltage of the first sampling point and a fourth voltage of the second sampling point when the second switch is closed again;

the first determining module is used for determining a first insulation resistance value of the first pole of the power battery to the ground and a second insulation resistance value of the second pole of the power battery to the ground according to the first resistance value, the second resistance value, the first voltage, the second voltage, the third voltage and the fourth voltage.

9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.

10. An electronic device, comprising:

a memory having a computer program stored thereon;

a processor for executing the computer program in the memory to carry out the steps of the method of any one of claims 1 to 7.