CN215768768U - Insulation detection system and vehicle - Google Patents
Insulation detection system and vehicle Download PDFInfo
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- CN215768768U CN215768768U CN202120731985.0U CN202120731985U CN215768768U CN 215768768 U CN215768768 U CN 215768768U CN 202120731985 U CN202120731985 U CN 202120731985U CN 215768768 U CN215768768 U CN 215768768U
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Abstract
The utility model provides an insulation detection system and a vehicle, wherein the insulation detection system comprises an insulation detection circuit, a high-voltage system and a plurality of non-vehicle body systems, wherein the high-voltage system comprises a power battery and a high-voltage module; the first end of the insulation detection circuit is connected with a vehicle body ground, the second end of the insulation detection circuit is connected between the positive pole of the power battery and the first end of the high-voltage module, the third end of the insulation detection circuit is connected between the negative pole of the power battery and the second end of the high-voltage module, and the non-vehicle body grounds of the plurality of non-vehicle body ground systems are respectively connected to the vehicle body ground through respective insulation detection switches. The utility model can reduce the difficulty and cost of insulation detection.
Description
Technical Field
The utility model relates to the technical field of insulation detection, in particular to an insulation detection system and a vehicle.
Background
The electric automobile is a complex system with coexisting high-voltage and low-voltage systems, and has definite requirements on the insulation resistance between a vehicle high-voltage system and a low-voltage loop based on safety requirements so as to reduce the personal electric shock risk caused by insulation failure. The body ground is a zero potential reference point of the whole vehicle, but for the reasons of anti-interference, electrical isolation and the like, part of vehicle-mounted systems adopt a non-body ground as the zero potential reference point, that is, the low-voltage loop comprises two types, one is a low-voltage loop taking the body ground as a reference system, and the other is a low-voltage loop taking the non-body ground as a reference system.
Most electric automobile manufacturers develop a special insulation detection part for detecting the insulation resistance between a whole automobile high-voltage system and a low-voltage loop taking the automobile body ground as a reference system in real time.
However, when the insulation resistance between the high-voltage system and the non-body ground system of the automobile needs to be detected, an insulation detection circuit needs to be additionally arranged, and because the insulation detection circuit needs to be additionally arranged for each non-body ground system, a large number of insulation detection circuits are easy to have compatibility and timing problems, and the difficulty of the insulation detection of the whole automobile is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an insulation detection system and a vehicle, and aims to solve the technical problem that the insulation detection difficulty of the whole vehicle is too high in the traditional scheme.
In order to achieve the purpose, the utility model adopts the technical scheme that:
an insulation detection system comprises an insulation detection circuit, a high-voltage system and a plurality of non-vehicle body ground systems, wherein the high-voltage system comprises a power battery and a high-voltage module;
the first end of the insulation detection circuit is connected with a vehicle body ground, the second end of the insulation detection circuit is connected between the positive pole of the power battery and the first end of the high-voltage module, the third end of the insulation detection circuit is connected between the negative pole of the power battery and the second end of the high-voltage module, and the non-vehicle body grounds of the plurality of non-vehicle body ground systems are respectively connected to the vehicle body ground through respective insulation detection switches.
Further, the insulation detection switch between the non-vehicle body ground and the vehicle body ground is any one of the following types of switches: a relay, a silicon-based type insulated gate bipolar transistor, a silicon-based type mosfet, a silicon carbide type igbt, or a silicon carbide type mosfet.
Further, high-voltage system still includes pre-charge switch, main positive switch, main negative switch, pre-charge resistance and a plurality of high-voltage module, wherein, the one end of main positive switch is connected to the power battery is anodal, and the other end is connected to the one end of pre-charge resistance, the other end of pre-charge resistance is connected to a plurality of that connect in parallel each other the one end of high-voltage module, the one end of main negative switch is connected to power battery's negative pole, and the other end is connected to a plurality of that connect in parallel each other the other end of high-voltage module, the one end of pre-charge switch is connected to the power battery is anodal, and the other end is connected to the other end of pre-charge resistance.
Further, the insulation detection circuit comprises a low-frequency signal source, a first resistor, a second resistor, a third resistor and a change-over switch, wherein a first end of the low-frequency signal source is connected to the ground of the vehicle body, a second end of the low-frequency signal source is connected to one end of the first resistor, the other end of the first resistor is connected to a stationary contact of the change-over switch, one end of the second resistor is connected between the positive pole of the power battery and the main positive switch, the other end of the second resistor is connected to a first movable contact of the change-over switch, one end of the third resistor is connected between the negative pole of the power battery and the main negative switch, and the other end of the third resistor is connected to a second movable contact of the change-over switch.
Further, the plurality of high voltage modules include at least an electric control device, a thermistor, and a DC-DC converter.
The utility model also provides a vehicle comprising the aforementioned insulation detection system.
In the insulation detection system provided by the utility model, the first end of the insulation detection circuit is connected with the vehicle body ground, the second end of the insulation detection circuit is connected between the positive electrode of the power battery and the first end of the high-voltage system, and the third end of the insulation detection circuit is connected between the negative electrode of the power battery and the second end of the high-voltage system, so that the insulation detection circuit can detect the insulation resistance between the high-voltage system and the vehicle body ground, and because the non-vehicle-body grounds of a plurality of non-vehicle-body ground systems are respectively connected with the vehicle body ground through respective insulation detection switches, when a certain non-vehicle-body ground system needs to be detected, the insulation detection circuit can test the insulation resistance between the high-voltage system and the non-vehicle-body ground system only by connecting the non-vehicle-body ground through the insulation detection switches, a large number of insulation detection circuits are not adopted, the cost is reduced, the problems of compatibility and time sequence brought by a plurality of insulation detection circuits are avoided, and the insulation detection difficulty of the whole vehicle is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of an insulation detection system according to the present invention;
FIG. 2 is another schematic view of the insulation detection system of the present invention;
fig. 3 is another schematic structural diagram of the insulation detection system of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the utility model.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the utility model, a system taking a reference ground except a vehicle body ground as a zero potential reference point in operation is called a non-vehicle body ground system.
In order to reduce the difficulty and cost of detecting the insulation resistance of a vehicle high-voltage system to a vehicle body ground system and a non-vehicle body ground system, the utility model provides a new testing mode, and particularly provides an insulation detecting system which comprises an insulation detecting circuit, a high-voltage system and a plurality of non-vehicle body ground systems, wherein the high-voltage system comprises a power battery and a high-voltage module, as shown in figure 1. Two ends of the high-voltage module are respectively connected to two ends of the power battery, and two ends of each non-vehicle body ground system are respectively connected to two ends of the power battery.
The first end of the insulation detection circuit is connected with the vehicle body ground, the second end of the insulation detection circuit is connected between the positive electrode of the power battery and the first end of the high-voltage module, the third end of the insulation detection circuit is connected between the negative electrode of the power battery and the second end of the high-voltage module, and the non-vehicle body grounds of the plurality of non-vehicle body ground systems are respectively connected to the vehicle body ground through respective insulation detection switches.
As shown in FIG. 1, the insulation detection system can comprise N non-vehicle body ground systems, wherein the N non-vehicle body ground systems are provided with non-vehicle body grounds corresponding to the N non-vehicle body grounds, and the non-vehicle body grounds 1-N are connected to the vehicle body grounds through insulation detection switches 1-N correspondingly.
As can be seen from fig. 1, the insulation resistance of the high-voltage system to the vehicle body ground system comprises an equivalent insulation resistance Rp between the positive pole of the power battery and the vehicle body ground and an equivalent insulation resistance Rn between the negative pole of the power battery and the vehicle body ground, the insulation resistance of the high-voltage system to the non-vehicle body ground system comprises an equivalent insulation resistance Rp between the positive pole of the power battery and the non-vehicle body ground and an equivalent insulation resistance Rn between the negative pole of the power battery and the non-vehicle body ground, taking the non-vehicle body ground system 1 as an example, the equivalent insulation resistance Rp1 between the positive pole of the power battery and the non-vehicle body ground 1 and the equivalent insulation resistance Rn1 between the negative pole of the power battery and the non-vehicle body ground 1; taking the non-vehicle body ground system N as an example, the system comprises an equivalent insulation resistance RpN between the positive pole of the power battery and the non-vehicle body ground N, and an equivalent insulation resistance RnN between the negative pole of the power battery and the non-vehicle body ground N.
According to the utility model, through an insulation detection circuit, two-aspect detection can be realized, namely, the detection of the insulation resistance of a high-voltage system to a vehicle body ground system and a non-vehicle body ground system can be realized. Firstly, disconnecting the insulation detection switches corresponding to the non-vehicle body ground systems to disconnect the non-vehicle body ground systems from the detection loop, thereby measuring the insulation resistance of the high-voltage system to the vehicle body ground system, namely detecting the equivalent insulation resistance Rp between the positive pole of the power battery and the vehicle body ground and the equivalent insulation resistance Rn between the negative pole of the power battery and the vehicle body ground; subsequently, after the insulation detection of the vehicle body ground system passes, the non-vehicle body ground 1 is connected with the vehicle body ground through the insulation detection switch 1, so that the insulation detection circuit can detect the parallel resistance of Rp1 and Rp and the parallel resistance of Rn1 and Rn, and sequentially detect the parallel resistance of Rpn and Rp and the parallel resistance of Rn and Rn in the manner described above. As Rp and Rn are measured in the previous step, Rp1-RpN and Rn1-RnN can be calculated according to the parallel resistance relation.
Therefore, the utility model can test the insulation resistance condition of the whole vehicle only by using one insulation detection circuit, and a large number of insulation detection circuits are not adopted, thereby effectively reducing the cost; and the problems of compatibility and time sequence brought by a plurality of insulation detection circuits do not exist, and the detection difficulty and the deployment difficulty of the insulation resistance of the whole vehicle are reduced.
The insulation detection switch between the non-vehicle body ground and the vehicle body ground can adopt any one of the following types of insulation detection switches: a relay, a silicon-based type Insulated Gate Bipolar Transistor (IGBT), a silicon-based type Metal Oxide Semiconductor Field Effect Transistor (MOSFET), a silicon carbide type IGBT, or a silicon carbide type MOSFET. In practical applications, the non-vehicle body areas may be connected to the vehicle body area by the same type of insulation detection switch, or may be connected to the vehicle body area by different types of insulation detection switches, which is not limited specifically.
It should be noted that, according to different vehicles, the corresponding high-voltage systems may have different settings, and the present invention is not limited thereto, and the insulation detection system provided by the present invention is suitable for various types of vehicles, and as an example, for example, a power battery high-voltage system loop is taken as an example, the high-voltage module may include a thermistor, an electrical device, and various contactors. The electrical appliance may include a DC charging port, an upper assembly, a driving module, a vehicle-mounted charger, a steering, a DC-DC conversion module, an electric control device, an air conditioning compressor, and the like, and the present invention is not limited thereto.
Specifically, continuing with fig. 2, the high-voltage system of the present invention is described, as shown in fig. 2, the high-voltage system includes a pre-charge switch, a main positive switch, a main negative switch, a pre-charge resistor, and a plurality of high-voltage modules, wherein one end of the main positive switch is connected to the positive electrode of the power battery, the other end of the main positive switch is connected to one end of the pre-charge resistor, the other end of the pre-charge resistor is connected to one ends of the plurality of high-voltage modules connected in parallel, one end of the main negative switch is connected to the negative electrode of the power battery, the other end of the main negative switch is connected to the other ends of the plurality of high-voltage modules connected in parallel, one end of the pre-charge switch is connected to the positive electrode of the power battery, and the other end of the pre-charge switch is connected to the other end of the pre-charge resistor. It should be noted that fig. 2 is only an exemplary illustration, and in practical applications, the high voltage system may vary according to different vehicles, but the insulation detection system provided by the present invention may still be applicable, which is not illustrated herein. It should be noted that the plurality of high voltage modules shown in fig. 2 are only exemplary and do not limit the present invention.
It should be noted that the specific form of the insulation detection circuit is not limited in the present invention, and all circuits having the insulation detection function can be used as the insulation detection circuit in the present invention. For example, the utility model may use an insulation detection circuit corresponding to an insulation resistance detection method, such as a bridge method, a signal injection method, a branch monitoring method, and the like, and is not limited specifically.
Referring to fig. 3, an insulation detection circuit as shown in fig. 3 may be adopted, where the insulation detection circuit includes a low frequency signal source, a first resistor, a second resistor, a third resistor, and a switch, where a first end of the low frequency signal source is connected to a vehicle body ground, a second end of the low frequency signal source is connected to one end of the first resistor, another end of the first resistor is connected to a stationary contact of the switch, one end of the second resistor is connected between a positive electrode of the power battery and the main positive switch, another end of the second resistor is connected to a first movable contact of the switch, one end of the third resistor is connected between a negative electrode of the power battery and the main negative switch, and another end of the third resistor is connected to a second movable contact of the switch. Taking the test of the insulation resistance between the high-voltage system and the ground of the vehicle body as an example, when the insulation equivalent resistance Rp needs to be tested, the first movable contact and the fixed contact of the change-over switch are contacted through the change-over switch to form a complete test loop, so that the insulation equivalent resistance Rp can be tested; similarly, when the insulation equivalent resistance Rn needs to be tested, the second movable contact of the change-over switch is in contact with the fixed contact through the change-over switch to form another complete test loop, so that the insulation equivalent resistance Rn can be tested. It should be noted that, as shown in fig. 3, the insulation detection circuit corresponding to the low-frequency signal injection method is taken as an example, in practical applications, there may be other low-frequency injection detection circuits or insulation detection circuits in other manners, which is not illustrated here
In an embodiment, the utility model also provides a vehicle comprising the insulation detection system as mentioned in the previous embodiment. The insulation detection circuit or the related insulation monitoring switch and the like can be mounted in a vehicle in the form of plastic or metal packaging modules, and are not limited specifically.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An insulation detection system is characterized by comprising an insulation detection circuit, a high-voltage system and a plurality of off-body systems, wherein the high-voltage system comprises a power battery and a high-voltage module;
the first end of the insulation detection circuit is connected with a vehicle body ground, the second end of the insulation detection circuit is connected between the positive pole of the power battery and the first end of the high-voltage module, the third end of the insulation detection circuit is connected between the negative pole of the power battery and the second end of the high-voltage module, and the non-vehicle body grounds of the plurality of non-vehicle body ground systems are respectively connected to the vehicle body ground through respective insulation detection switches.
2. The insulation detection system according to claim 1, wherein the insulation detection switch between the off-body ground and the on-body ground is any one of the following types of switches: a relay, a silicon-based type insulated gate bipolar transistor, a silicon-based type mosfet, a silicon carbide type igbt, or a silicon carbide type mosfet.
3. The insulation detection system according to claim 1 or 2, wherein the high voltage system further comprises a pre-charge switch, a main positive switch, a main negative switch, a pre-charge resistor, and a plurality of the high voltage modules, wherein one end of the main positive switch is connected to the positive electrode of the power battery, the other end of the main positive switch is connected to one end of the pre-charge resistor, the other end of the pre-charge resistor is connected to one end of the plurality of the high voltage modules connected in parallel, one end of the main negative switch is connected to the negative electrode of the power battery, the other end of the main negative switch is connected to the other end of the plurality of the high voltage modules connected in parallel, one end of the pre-charge switch is connected to the positive electrode of the power battery, and the other end of the pre-charge switch is connected to the other end of the pre-charge resistor.
4. The insulation detection system according to claim 3, wherein the insulation detection circuit comprises a low frequency signal source, a first resistor, a second resistor, a third resistor and a change-over switch, wherein a first end of the low frequency signal source is connected to the vehicle body ground, a second end of the low frequency signal source is connected to one end of the first resistor, the other end of the first resistor is connected to a stationary contact of the change-over switch, one end of the second resistor is connected between the positive pole of the power battery and the main positive switch, the other end of the second resistor is connected to a first movable contact of the change-over switch, one end of the third resistor is connected between the negative pole of the power battery and the main negative switch, and the other end of the third resistor is connected to a second movable contact of the change-over switch.
5. The insulation detection system of claim 3, wherein said plurality of high voltage modules comprises at least an electronic control device, a thermistor, and a DC-DC converter.
6. A vehicle, characterized in that it comprises an insulation detection system according to any one of claims 1-5.
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| CN202120731985.0U CN215768768U (en) | 2021-04-09 | 2021-04-09 | Insulation detection system and vehicle |
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| CN202120731985.0U CN215768768U (en) | 2021-04-09 | 2021-04-09 | Insulation detection system and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115792386A (en) * | 2023-02-08 | 2023-03-14 | 广东采日能源科技有限公司 | Insulation detection method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115792386A (en) * | 2023-02-08 | 2023-03-14 | 广东采日能源科技有限公司 | Insulation detection method and system |
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