Power storage battery system insulation resistor detection circuit and detecting method

Abstract

The invention discloses a power storage battery system insulation resistor detection circuit and detecting method. The power storage battery system insulation resistance detection circuit comprises afirst discharging resistor, a second discharging resistor, a first sampling resistor, a second sampling resistor, a third sampling resistor, a fourth sampling resistor, a detecting starting switch, afirst controlling switch, a second controlling switch, a third controlling switch and a fourth controlling switch; one end of the first discharging resistor is connected with a positive electrode of adetected battery, the other end of the first discharging resistor is connected with one end of the first controlling switch, and the other end of the first controlling switch is grounded; one end ofthe second discharging resistor is connected with a negative electrode of the detected battery, the other end of the second discharging resistor is connected with one end of the second controlling switch, and the other end of the second controlling switch is grounded. By means of the power storage battery system insulation resistor detection circuit and detecting method, the detection precision ofan insulation resistor is improved, and artificial increasing of leakage current of the system is avoided.

Description

technical field [0001] The invention relates to the technical field of power battery management application, in particular to a power battery system insulation resistance detection circuit and detection method. Background technique [0002] Insulation resistance detection is to detect the insulation resistance of the positive and negative busbars of the power battery system and the battery case (which may be the body of the electric vehicle, or the battery cabinet or box, etc.) to ensure the safety of the insulation between the power battery and the outside world . Therefore, the traction battery management system needs to monitor the insulation of the traction battery system in real time to avoid endangering the life safety of operators. [0003] At present, there are two main ways to detect the insulation status of power battery packs: AC signal injection detection method and DC detection method. The circuit structure of the AC signal injection detection scheme is relati...

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Problems solved by technology

And the time to reach a steady state is related to the insulation resistance R P and R N is closely related to the size of the insulation resistance, the greater the resistance of the insulation resistance, the longer the time to stabilize, resulting in the detection cycle of the insulation resistance being affected

And when the switch is switched, V P and V N Acquisition of voltage without reaching a steady state will greatly affect the acquisition accuracy of insulation resistance

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