Device and method for detecting insulation resistance of battery pack
A technology of insulation resistance and detection device, which is applied in the direction of measuring device, high resistance measurement, and measurement of resistance/reactance/impedance, etc., which can solve the problems of insulating material aging and insulation performance degradation, so as to prevent calculation errors and ensure accuracy , Enhance the effect of user experience
Pending Publication Date: 2022-06-21
深蓝汽车科技有限公司
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Problems solved by technology
[0002] Insulation resistance is the ability of insulating materials to resist electric current. As time goes by, insulating materials begin to age, resulting in a decrease in insulation performance
Method used
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Embodiment 1
[0054] In the second step, the controllable switch K1 is controlled to be disconnected, the controllable switch K2 is controlled to be disconnected, and then the third step is performed.
[0055] The third step is to collect 66 times of sampling point A voltage (that is, the voltage at sampling point A) and sampling point B voltage (that is, the voltage at sampling point B) with 10ms as the sampling period, and store (cache) the collected 50 times The voltage of sampling point A is sent to the array Ua[50], and the voltage of sampling point B collected for the last 50 times is stored (cached) in the array Ub[50], and then the fourth step is executed.
[0056] The fourth step is to calculate the average value U of the voltage of 50 sampling points A of the array Ua[50] avg_A , calculate the average value U of the voltage of 50 sampling points B of the array Ub[50] avg_B , and then go to step five.
[0057] The fifth step is to judge whether the elements in the array Ua[50] (t...
Embodiment 2
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The invention discloses a battery pack insulation resistance detection device and detection method, the detection device comprises a controller and an insulation resistance detection circuit, and the insulation resistance detection circuit comprises resistors R1, R2, R3, R4, R5, R6, R7 and R8 and controllable switches K1 and K2. According to the method, calculation errors caused by large changes of the insulation resistance in one insulation detection period can be prevented, it is guaranteed that detection is carried out under the condition that the insulation resistance is relatively stable in each insulation detection period, the detection accuracy is guaranteed, missed detection of faults caused by long-time insulation resistance reduction is avoided, and the detection efficiency is improved. False detection is avoided when the insulation resistance is reduced in a short time, the reliability of the whole vehicle can be improved, the user experience is enhanced, and the safety of the whole vehicle is ensured.
Description
technical field [0001] The invention belongs to the field of power battery detection, and in particular relates to a detection device and a detection method for the insulation resistance of a battery pack. Background technique [0002] Insulation resistance is the ability of insulating materials to resist electric current. As time goes by, insulating materials begin to age, resulting in a decrease in insulating performance. New energy vehicles have entered the era of electrification in an all-round way, and more and more electrical components are used in the car, so a stable and reliable insulation resistance detection method is designed to always accurately know the insulation performance of electrical equipment in new energy vehicles to avoid electric shocks in vehicles , fire, short circuit and other accidents are problems that need to be solved urgently. Contents of the invention [0003] The object of the present invention is to provide a detection device and detecti...
Claims
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IPC IPC(8): G01R27/02G01R31/389
CPCG01R27/025G01R31/389
Inventor 刘海洋王小玲
Owner 深蓝汽车科技有限公司