A leakage sensor, a high-voltage distribution box and an electric vehicle

Abstract

In order to solve the problem that since an existing electric leakage sensor cannot detect fault of itself, the electric leakage sensor may fail or gives a false alarm, the invention provides an electric leakage sensor, a high-voltage distribution box and an electric vehicle. The electric leakage sensor comprises a voltage sampling circuit, a communication module, an excitation power supply, a current-limiting resistor, a self-check switch, a threshold resistor and a detection resistor, wherein the excitation power supply, the current-limiting resistor, the self-detection switch, the threshold resistor and the detection resistor are connected in series in sequence to form a loop. An electric leakage detection input end is arranged between the current-limiting resistor and the self-detection switch; an earth terminal is arranged between the threshold resistor and the detection resistor; the voltage sampling circuit detects voltage of the excitation power supply, the detection resistor and the electric leakage detection input end respectively; the excitation power supply comprises a positive excitation power supply and a negative excitation power supply, which are connected in parallel, wherein the positive excitation power supply is connected with a positive excitation switch, and the negative excitation power supply is connected with a negative excitation switch; and the communication module is connected with the voltage sampling circuit, the self-detection switch, the positive excitation switch, the negative excitation switch and a battery manager.

Description

technical field

[0001] The invention relates to the field of electric vehicles, in particular to the field of leakage sensors on electric vehicles. Background technique

[0002] At present, the technology of electric vehicles is not particularly perfect. For example, the reliability of parts, such as failure of parts, may seriously affect its normal use, and even affect the safety of life and property of users.

[0003] The high-voltage system on an electric vehicle generally includes a high-voltage power battery, a high-voltage load, and a high-voltage switch group (contactor) arranged between the high-voltage power battery and the high-voltage load. The high-voltage switch group is generally placed in a high-voltage distribution box. The box is equipped with a high-voltage input interface and a high-voltage load interface. High-voltage load refers to the high-voltage electrical equipment on the electric vehicle. Among them, if there is leakage in the high-voltage system,...

Examples

Embodiment 1

[0039] This example will specifically explain the leakage sensor 1 provided by the present invention in conjunction with the accompanying drawings, as figure 1As shown, the leakage sensor 1 in this example can be connected between any position of the high-voltage system (the high-voltage power battery 2 described in the background technology, the high-voltage load 5 and the high-voltage switch group 4) and the ground for leakage detection, so-called leakage detection It refers to the measurement and calculation of the equivalent insulation resistance RX between its high-voltage system and the insulation ground (that is, the vehicle body), and compares it with the preset threshold to determine whether it is leakage. The leakage sensor 1 in this example operates under the control of the battery manager 3 and feeds back relevant information (such as the detected voltage value or the calculated equivalent insulation resistance RX) to the battery manager 3 . In order to enable thos...

Embodiment 2

[0072] This example provides a high-voltage distribution box 100, such as Figure 4 As shown, the high-voltage distribution box 100 is provided with a high-voltage switch group 4, a high-voltage load interface 101, and a high-voltage input interface; the high-voltage switch group 4 is connected between the high-voltage load interface 101 and the high-voltage input interface;

[0073] The high-voltage distribution box 100 also includes the leakage sensor 1 provided in the above-mentioned embodiment 1; the leakage detection input terminal 1a of the leakage sensor 1 is connected to the high-voltage input interface or the high-voltage load interface 101, and the leakage sensor The ground terminal 1b of 1 is grounded.

[0074] This example does not improve other structures of the high-voltage distribution box 100, but only improves the leakage sensor 1 installed in the high-voltage distribution box 100, because the above-mentioned leakage sensor 1 and the high-voltage switch group ...

Embodiment 3

[0077] This example provides an electric vehicle, such as Figure 1-Figure 3 As shown, it includes a high-voltage power battery 2, a battery manager 3, a high-voltage load 5 and the high-voltage distribution box 100 disclosed in the above-mentioned embodiment 2;

[0078] The high-voltage power battery 2 is connected to the high-voltage input interface of the high-voltage distribution box 100 , and the high-voltage load 5 is connected to the high-voltage load interface 101 of the high-voltage distribution box 100 .

[0079] Such as figure 1 As shown, the electric vehicle also includes a self-check button 6, and the self-check button 6 is connected to the battery manager 3 through hard wires. The self-inspection button 6 is used to manually notify the battery manager 3 to send leakage self-inspection information, so as to realize manual leakage self-inspection. The user can regularly check the leakage detection function of the leakage sensor 1 on the vehicle, and only needs to...

technical field

[0001] The invention relates to the field of electric vehicles, in particular to the field of leakage sensors on electric vehicles. Background technique

[0002] At present, the technology of electric vehicles is not particularly perfect. For example, the reliability of parts, such as failure of parts, may seriously affect its normal use, and even affect the safety of life and property of users.

[0003] The high-voltage system on an electric vehicle generally includes a high-voltage power battery, a high-voltage load, and a high-voltage switch group (contactor) arranged between the high-voltage power battery and the high-voltage load. The high-voltage switch group is generally placed in a high-voltage distribution box. The box is equipped with a high-voltage input interface and a high-voltage load interface. High-voltage load refers to the high-voltage electrical equipment on the electric vehicle. Among them, if there is leakage in the high-voltage system,...

Examples

Embodiment 1

[0039] This example will specifically explain the leakage sensor 1 provided by the present invention in conjunction with the accompanying drawings, as figure 1As shown, the leakage sensor 1 in this example can be connected between any position of the high-voltage system (the high-voltage power battery 2 described in the background technology, the high-voltage load 5 and the high-voltage switch group 4) and the ground for leakage detection, so-called leakage detection It refers to the measurement and calculation of the equivalent insulation resistance RX between its high-voltage system and the insulation ground (that is, the vehicle body), and compares it with the preset threshold to determine whether it is leakage. The leakage sensor 1 in this example operates under the control of the battery manager 3 and feeds back relevant information (such as the detected voltage value or the calculated equivalent insulation resistance RX) to the battery manager 3 . In order to enable thos...

Embodiment 2

[0072] This example provides a high-voltage distribution box 100, such as Figure 4 As shown, the high-voltage distribution box 100 is provided with a high-voltage switch group 4, a high-voltage load interface 101, and a high-voltage input interface; the high-voltage switch group 4 is connected between the high-voltage load interface 101 and the high-voltage input interface;

[0073] The high-voltage distribution box 100 also includes the leakage sensor 1 provided in the above-mentioned embodiment 1; the leakage detection input terminal 1a of the leakage sensor 1 is connected to the high-voltage input interface or the high-voltage load interface 101, and the leakage sensor The ground terminal 1b of 1 is grounded.

[0074] This example does not improve other structures of the high-voltage distribution box 100, but only improves the leakage sensor 1 installed in the high-voltage distribution box 100, because the above-mentioned leakage sensor 1 and the high-voltage switch group ...

Embodiment 3

[0077] This example provides an electric vehicle, such as Figure 1-Figure 3 As shown, it includes a high-voltage power battery 2, a battery manager 3, a high-voltage load 5 and the high-voltage distribution box 100 disclosed in the above-mentioned embodiment 2;

[0078] The high-voltage power battery 2 is connected to the high-voltage input interface of the high-voltage distribution box 100 , and the high-voltage load 5 is connected to the high-voltage load interface 101 of the high-voltage distribution box 100 .

[0079] Such as figure 1 As shown, the electric vehicle also includes a self-check button 6, and the self-check button 6 is connected to the battery manager 3 through hard wires. The self-inspection button 6 is used to manually notify the battery manager 3 to send leakage self-inspection information, so as to realize manual leakage self-inspection. The user can regularly check the leakage detection function of the leakage sensor 1 on the vehicle, and only needs to...

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