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Insulation detection circuit and method, power battery fast charging method and related device

A power battery and detection circuit technology, which is applied in the direction of measuring devices, secondary battery charging/discharging, circuits, etc., can solve the problems of potential safety hazards, inability to heat film insulation detection, etc., and achieve the effect of increasing safety

Pending Publication Date: 2022-03-15
GAC AION NEW ENERGY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an insulation detection circuit and method, a power battery fast charging method and related devices to solve the problem in the prior art that the insulation detection of the heating film cannot be performed before the high voltage is applied, resulting in potential safety hazards

Method used

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  • Insulation detection circuit and method, power battery fast charging method and related device
  • Insulation detection circuit and method, power battery fast charging method and related device
  • Insulation detection circuit and method, power battery fast charging method and related device

Examples

Experimental program
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Effect test

Embodiment 1

[0057] see figure 1 , the insulation detection circuit provided by the present invention will now be described.

[0058] This embodiment provides an insulation detection circuit, including an insulation detection module D, a circuit switch, a resistor and a heating film C. The two ends of the insulation detection module D are respectively connected to the positive pole and the negative pole of the power battery A; the circuit switches include the positive pole switch K1, the negative pole switch K3, the pre-charging switch K2 and the heating film switch K4, the positive pole of the power battery A and the fast charging pile B A positive switch K1 is connected between the positive poles of the power battery A and a negative pole switch K3 is connected between the negative pole of the power battery A and the negative pole of the fast charging pile B; the resistance includes the pre-charging resistor R1 and the first high-voltage sampling resistor R2, and the positive pole switch...

Embodiment 2

[0066] In one embodiment, as figure 2 As shown, an insulation detection method is provided, and the insulation detection method is applied in figure 1 In the insulation detection circuit in, include the following steps:

[0067] S01: When the fast charging gun insertion signal of the fast charging charging pile is detected, the positive switch, negative switch and heating film switch in the insulation detection circuit are controlled to be disconnected, and the precharge switch is controlled to be closed.

[0068] In this embodiment, the positive switch, the negative switch, the pre-charge switch and the heating film switch in the insulation detection circuit are respectively a positive relay, a negative relay, a pre-charge relay and a heating film relay as an example for illustration.

[0069] When using the fast charging pile to charge the power battery of the vehicle, it is necessary to insert the fast charging gun of the fast charging charging pile into the vehicle. When...

Embodiment 3

[0092] In one embodiment, as Figure 4As shown, a power battery fast charging method is provided, and the power battery insulation detection method is applied to the above-mentioned insulation detection circuit, and the method includes:

[0093] S10: When the fast charging gun insertion signal of the fast charging charging pile is detected, the insulation detection circuit is controlled to perform insulation detection on the power battery and the heating film to obtain the insulation detection result.

[0094] When the fast charging gun insertion signal of the fast charging pile is detected, the battery management system (BMS) of the vehicle is awakened, and the awakened BMS enters the fast charging preparation mode of the power battery. , but first control the positive relay, negative relay and heating film relay in the insulation detection circuit to disconnect, and control the pre-charging relay to close. In the high-voltage connection state, the positive voltage of the po...

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Abstract

The invention discloses an insulation detection circuit and method and a power battery fast charging method and device, the insulation detection circuit comprises an insulation detection module, a heating film and a first high-voltage sampling resistor, the insulation detection module is connected with the positive electrode and the negative electrode of a power battery, and a connection positive electrode switch is connected between the positive electrode of the power battery and the positive electrode of a fast charging pile; a cathode switch is connected between the cathode of the power battery and the cathode of the fast charging pile, two ends of the anode switch are connected in parallel with a pre-charging switch and a pre-charging resistor, the pre-charging switch and the pre-charging resistor are connected in series and are connected in parallel at two ends of the anode switch, and a first high-voltage sampling resistor is connected in parallel at two ends of the cathode switch; the heating film and the heating film switch are connected in series between the two ends, connected with the quick charging pile, of the power battery; according to the invention, on the basis of the traditional power battery electrical architecture, the high-voltage sampling circuit and the pre-charging circuit are reasonably utilized, so that insulation detection on the heating film before high-voltage electricity is applied is realized, and the safety is improved.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to an insulation detection circuit and method, a fast charging method for a power battery and related devices. Background technique [0002] In new energy vehicles, the battery management system has an insulation detection circuit, which will detect the insulation resistance of the power battery in real time when it is activated, so as to judge whether the insulation of the power battery meets the safety standard. That is, when the battery management system controls the main relay to close and the high voltage is established in the vehicle, since the high voltage circuit of the vehicle has been turned on, the insulation detection circuit of the battery management system can synchronously detect the insulation resistance of the vehicle to determine whether the vehicle is There is an insulation fault, thereby ensuring the safety of the power battery and the vehicle. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12H01M10/44
CPCG01R31/1263H01M10/446H01M10/443
Inventor 马钊邱万超赖吉健
Owner GAC AION NEW ENERGY AUTOMOBILE CO LTD
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