CN210062685U - High-voltage discharge device and vehicle - Google Patents
High-voltage discharge device and vehicle Download PDFInfo
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- CN210062685U CN210062685U CN201920484635.1U CN201920484635U CN210062685U CN 210062685 U CN210062685 U CN 210062685U CN 201920484635 U CN201920484635 U CN 201920484635U CN 210062685 U CN210062685 U CN 210062685U
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Abstract
The present disclosure relates to a high-voltage discharge device and a vehicle. The device comprises a first control module, a second control module and a pre-charging load; the first control switch is respectively connected with a battery management system of the vehicle, a power battery of the vehicle and a bus capacitor of a driving motor of the vehicle, and the pre-charging load is connected with the bus capacitor; one end of the second control switch is respectively connected with the first control switch and the bus capacitor, and the other end of the second control switch is connected with the pre-charging load; the first control switch is configured to disconnect the power battery from the bus capacitor when receiving an indication signal which is sent by the battery management system and indicates that a high-voltage system of the vehicle is abnormal; and the second control switch is configured to conduct the connection between the bus capacitor and the pre-charging load when receiving an indication signal sent by the battery management system. Through the technical scheme, the pre-charging load can be utilized to discharge the bus capacitor when the high-voltage system of the vehicle breaks down, so that the driving safety is guaranteed.
Description
Technical Field
The present disclosure relates to the field of vehicle technology, and in particular, to a high voltage discharge device and a vehicle.
Background
High Voltage Interlock (HVIL) systems have become increasingly standard for vehicles due to driving safety concerns. When the high-voltage component of the vehicle is abnormal and the high-voltage interlocking system for detecting the high-voltage component is activated, at this time, the Battery Management System (BMS) connected to the high-voltage interlocking system cuts off the power supply circuit of the driving motor of the vehicle from the power Battery, so that the output voltage of the power Battery is zero.
However, because a bus capacitor inside the driving motor has a large amount of charges to be released and is still in a high-voltage state, the safety of vehicles and personnel is seriously threatened.
SUMMERY OF THE UTILITY MODEL
To overcome the problems in the prior art, the present disclosure provides a high voltage discharge apparatus and a vehicle.
In order to achieve the above object, the present disclosure provides a high voltage discharge device including: the first control switch, the second control switch and the pre-charging load;
the first control switch is respectively connected with a battery management system of a vehicle, a power battery of the vehicle and a bus capacitor of a driving motor of the vehicle, and the pre-charging load is connected with the bus capacitor;
one end of the second control switch is connected with the first control switch and the bus capacitor respectively, and the other end of the second control switch is connected with the pre-charging load;
the first control switch is configured to disconnect the power battery from the bus capacitor to enable the power battery to stop charging the bus capacitor when receiving an indication signal which is sent by the battery management system and indicates that a high-voltage system of the vehicle is abnormal;
the second control switch is configured to conduct connection between the bus capacitor and the pre-charging load to discharge the bus capacitor through the pre-charging load when the indication signal sent by the battery management system is received.
Optionally, the first control switch comprises:
a first main relay, a coil of which is connected with the battery management system and a contact of which is connected in series between a first pole of the power battery and a first end of the bus capacitor;
a second main relay having a coil connected to the battery management system and a contact connected in series between a second pole of the power cell and a second end of the bus capacitor;
initially, the contact of the first main relay is in a closed state, and the contact of the second main relay is in an open state;
when the first control switch receives the indication signal sent by the battery management system, the contact of the first main relay and the contact of the second main relay are both in an off state.
Optionally, the second control switch comprises:
a discharge relay having a coil connected to the battery management system and a contact connected in series between a second pole of the power battery and a first end of the bus capacitor;
initially, the contact of the discharge relay is in an off state;
when the second control switch receives the indication signal sent by the battery management system, the contact of the discharging relay is in a closed state.
Optionally, the apparatus further comprises:
and the third control switch is connected with the battery management system and between the bus capacitor and the pre-charging load, and is configured to disconnect the bus capacitor and the pre-charging load when receiving an indication signal which is sent by the battery management system and indicates that the pre-charging of the bus capacitor is completed in the process that the power battery charges the bus capacitor, so that the driving motor enters a normal working state.
Optionally, the third control switch comprises:
a pre-charge relay having a coil connected to the battery management system and a contact connected in series between the second end of the bus capacitor and the pre-charge load;
initially, the pre-charge relay is in a closed state;
when the third control switch receives the indication signal which is sent by the battery management system and indicates that the bus capacitor is completely precharged, the contact of the precharging relay is in an open state.
Optionally, the pre-charge load is a resistor, and the resistor is connected in series between the second end of the bus capacitor and the second control switch.
The present disclosure also provides a vehicle, including a battery management system, a driving motor and the high-voltage discharging device provided by the embodiment of the present disclosure, the driving motor includes the bus capacitor.
Through the technical scheme, the following technical effects can be at least achieved:
when the indication signal which is sent by the battery management system and indicates that the high-voltage system of the vehicle is abnormal is received, the first control switch of the high-voltage discharging device of the vehicle disconnects the power battery of the vehicle from the bus capacitor, the second control switch conducts the connection between the bus capacitor and the pre-charging load of the high-voltage discharging device, and therefore power supply of the power battery to the driving motor can be cut off when the high-voltage system of the vehicle fails, the pre-charging load is used for discharging the bus capacitor, and driving safety is guaranteed. In addition, the device does not need to add extra elements such as a discharge load and the like, has a simple structure, does not need to occupy larger volume and has low cost.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a schematic circuit configuration diagram illustrating a high voltage discharge device according to an exemplary embodiment of the present disclosure;
FIG. 2 is a schematic circuit connection diagram of a high voltage discharge device provided by the present disclosure operating in a normal condition;
FIG. 3 is a schematic circuit diagram of a high voltage discharge device provided by the present disclosure operating in the event of a high voltage system failure;
fig. 4 is a schematic circuit connection diagram of the high-voltage discharging device provided by the present disclosure when the driving motor is normally powered.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In the present disclosure, the terms "first," "second," and the like in the description and claims of the present disclosure and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The disclosed embodiment provides a high voltage discharge apparatus, which includes a first control switch 101, a second control switch 102, and a precharge load 103, as shown in fig. 1 to 4. The first control switch 101 is connected to a battery management system (not shown) of the vehicle, a power battery 202 of the vehicle, and a bus capacitor 203 of a drive motor of the vehicle, and the precharge load 103 is connected to the bus capacitor 203. One end of the second control switch 102 is connected to the first control switch 101 and the bus capacitor 203, respectively, and the other end is connected to the precharge load 103.
When the high-voltage system of the vehicle is in a normal working state, the first control switch 101 is in a conducting state, the power battery 202, the bus capacitor 203 and the pre-charging load 103 are connected in series to form a pre-charging loop, and at this time, the power battery 202 charges the bus capacitor 203.
When the high-voltage system of the vehicle breaks down, the high-voltage interlocking system of the high-voltage system is monitored in real time and activated, at the moment, the battery management system connected with the high-voltage interlocking system generates an indication signal indicating that the high-voltage system of the vehicle is abnormal according to the high-voltage power-off command, and sends the indication signal to the first control switch 101 and the second control switch 102.
When receiving the instruction signal, the first control switch 101 disconnects the power battery 202 from the bus capacitor 203, so that the power battery 202 stops charging the bus capacitor 203. When receiving the instruction signal, the second control switch 102 turns on the connection between the bus capacitor 203 and the precharge load 103, and at this time, the bus capacitor 203, the precharge load 103, and the second control switch 102 are connected in series to form a discharge circuit, so that the bus capacitor 203 is discharged by the precharge load 103.
In one possible implementation, as shown in fig. 2 and 3, the first control switch 101 may include: a first main relay and a second main relay. The coil (not shown) of the first main relay is connected to a battery management system (not shown) and the contacts are connected in series between the first pole of the power cell 202 and the first end of the bus capacitor 203. The coil (not shown) of the second main relay is connected to the battery management system and the contacts are connected in series between the second pole of the power battery 202 and the second end of the bus capacitor 203. The first pole of the power battery is a positive pole, and the second pole of the power battery is a negative pole. The first pole of the power battery 202 may be a negative pole, and the second pole may be a positive pole.
The second control switch 102 may include: and a discharge relay, the coil (not shown) of which is connected with the battery management system and the contact is connected in series between the second pole of the power battery 202 and the first end of the bus capacitor 203.
The precharge load 103 may include: and the resistor is connected between the second end of the bus capacitor 203 and the second control switch 102 in series.
As shown in fig. 2, initially, that is, when the high voltage system of the vehicle is in a normal operating state, the contact of the first main relay is in a closed state, the contact of the second main relay is in an open state, and the contact of the discharging relay is in an open state. At this time, the power battery 202, the contact of the first main relay, the bus capacitor 203, and the precharge load 103 are connected in series to form a precharge circuit, and the power battery 202 precharges the bus capacitor 203 through the precharge load 103.
It should be noted that, in the process of charging the bus capacitor 203 by the power battery 202, the vehicle Controller of the vehicle sends the voltage across the bus capacitor 203 to the battery management system through a Controller Area Network (CAN), and the battery management system determines whether the pre-charging is completed. Specifically, when the voltage of the bus capacitor 203 reaches a predetermined value, or the voltage difference between the bus capacitor 203 and the power battery 202 is smaller than a preset threshold, the battery management system determines that the pre-charging is completed. The preset threshold value can be set according to needs.
As shown in fig. 3, when the high-voltage system of the vehicle is in fault, the coil of the first main relay and the coil of the second main relay both trigger the respective contacts to open in response to an indication signal sent by the battery management system and indicating that the high-voltage system of the vehicle is abnormal, at this time, the pre-charging circuit is opened, and the power battery 202 stops charging the bus capacitor 203. At the same time, the coil of the discharging relay responds to an indication signal which is sent by the battery management system and indicates that the high-voltage system of the vehicle is abnormal, and triggers the corresponding contact to be closed, at the moment, the contact of the bus capacitor 203, the pre-charging load 103 and the discharging relay are connected in series to form a discharging loop, and redundant voltage of the bus capacitor 203 is released through the pre-charging load 103.
By the device, when a high-voltage system of the vehicle fails, the power supply of the power battery 202 to the driving motor 205 can be cut off, and the pre-charging load 103 is used for discharging the bus capacitor 203, so that the driving safety is guaranteed. In addition, the device does not need to add extra elements such as a discharge load and the like, has a simple structure, does not need to occupy larger volume and has low cost. In another embodiment of the present disclosure, as shown in fig. 2 and 3, the apparatus may further include a third control switch 104. The third control switch 104 is connected to the battery management system and is connected between the bus capacitor 203 and the pre-charge load 103.
When the third control switch 104 receives an indication signal sent by the battery management system and indicating that the pre-charging of the bus capacitor 203 is completed during the process that the power battery 202 charges the bus capacitor 203, the connection between the bus capacitor 203 and the pre-charging load 103 is disconnected, at this time, the bus capacitor 203 discharges, and the output voltage of the bus capacitor is transmitted to the driving motor 205 through the inverter 204, so that the driving motor 205 enters a normal working state.
In one possible implementation, as shown in fig. 2 and 4, the third control switch 104 includes: a pre-charging relay, the coil (not shown) of which is connected to the battery management system and the contacts of which are connected in series between the second end of the bus capacitor 203 and the pre-charging load 103.
As shown in fig. 2, initially, that is, when the high voltage system of the vehicle is in a normal operating state, the contacts of the first main relay and the pre-charge relay are in a closed state, and at this time, the power battery 202, the contacts of the first main relay, the bus capacitor 203, the contacts of the pre-charge relay, and the pre-charge circuit in which the pre-charge load is sequentially connected are in a closed state, and the power battery 202 starts pre-charging the bus capacitor 203.
As shown in fig. 3, when the high-voltage system of the vehicle has a fault, the coil of the discharging relay triggers the corresponding contact to close in response to an indication signal sent by the battery management system and indicating that the high-voltage system of the vehicle is abnormal, at this time, the bus capacitor 203, the contact of the discharging relay, the pre-charging load 103 and the contact of the pre-charging relay are connected in series to form a discharging loop, and the redundant voltage of the bus capacitor 203 is released through the pre-charging load 103.
As shown in fig. 4, when the coil of the pre-charge relay responds to the indication signal sent by the battery management system and indicating that the pre-charge of the bus capacitor 203 is completed, the corresponding contact is triggered to be opened, meanwhile, the contact of the second main relay is closed, and the output voltage of the bus capacitor 203 is transmitted to the driving motor 205 through the inverter 204, so that the driving motor 205 works normally.
Through the device of the embodiment, the overcharge protection of the bus capacitor in the precharge process can be realized, and meanwhile, when a high-voltage system of a vehicle breaks down, the power supply of the power battery to the driving motor is cut off, and the precharge relay and the precharge load are used for discharging the bus capacitor, so that the driving safety is ensured. In addition, the device does not need to add extra elements such as a discharge load and the like, has a simple structure, does not need to occupy larger volume and has low cost.
The present disclosure also provides a vehicle, including a battery management system, a driving motor and the high-voltage discharging device provided by the embodiment of the present disclosure, the driving motor includes a bus capacitor. The high voltage discharge device is not described in detail herein.
Through the vehicle provided by the disclosure, the power supply of the power battery to the driving motor can be cut off when the high-voltage system of the vehicle breaks down, and the pre-charging load is utilized to discharge the bus capacitor, so that the driving safety is guaranteed. In addition, the device does not need to add extra elements such as a discharge load and the like, has a simple structure, does not need to occupy larger volume and has low cost.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (7)
1. A high voltage discharge device, comprising: the first control switch, the second control switch and the pre-charging load;
the first control switch is respectively connected with a battery management system of a vehicle, a power battery of the vehicle and a bus capacitor of a driving motor of the vehicle, and the pre-charging load is connected with the bus capacitor;
one end of the second control switch is connected with the first control switch and the bus capacitor respectively, and the other end of the second control switch is connected with the pre-charging load;
the first control switch is configured to disconnect the power battery from the bus capacitor to enable the power battery to stop charging the bus capacitor when receiving an indication signal which is sent by the battery management system and indicates that a high-voltage system of the vehicle is abnormal;
the second control switch is configured to conduct connection between the bus capacitor and the pre-charging load to discharge the bus capacitor through the pre-charging load when the indication signal sent by the battery management system is received.
2. The apparatus of claim 1, wherein the first control switch comprises:
a first main relay, a coil of which is connected with the battery management system and a contact of which is connected in series between a first pole of the power battery and a first end of the bus capacitor;
a second main relay having a coil connected to the battery management system and a contact connected in series between a second pole of the power cell and a second end of the bus capacitor;
initially, the contact of the first main relay is in a closed state, and the contact of the second main relay is in an open state;
when the first control switch receives the indication signal sent by the battery management system, the contact of the first main relay and the contact of the second main relay are both in an off state.
3. The apparatus of claim 1, wherein the second control switch comprises:
a discharge relay having a coil connected to the battery management system and a contact connected in series between a second pole of the power battery and a first end of the bus capacitor;
initially, the contact of the discharge relay is in an off state;
when the second control switch receives the indication signal sent by the battery management system, the contact of the discharging relay is in a closed state.
4. The apparatus of claim 1, further comprising:
and the third control switch is connected with the battery management system and between the bus capacitor and the pre-charging load, and is configured to disconnect the bus capacitor and the pre-charging load when receiving an indication signal which is sent by the battery management system and indicates that the pre-charging of the bus capacitor is completed in the process that the power battery charges the bus capacitor, so that the driving motor enters a normal working state.
5. The apparatus of claim 4, wherein the third control switch comprises:
a pre-charge relay having a coil connected to the battery management system and a contact connected in series between the second end of the bus capacitor and the pre-charge load;
initially, the pre-charge relay is in a closed state;
when the third control switch receives the indication signal which is sent by the battery management system and indicates that the bus capacitor is completely precharged, the contact of the precharging relay is in an open state.
6. The apparatus of any of claims 1-5, wherein the pre-charge load is a resistor connected in series between the second end of the bus capacitance and the second control switch.
7. A vehicle characterized by comprising a battery management system, a drive motor, and the high-voltage discharge device of any one of claims 1 to 6, the drive motor including the bus capacitor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920484635.1U CN210062685U (en) | 2019-04-10 | 2019-04-10 | High-voltage discharge device and vehicle |
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| CN201920484635.1U CN210062685U (en) | 2019-04-10 | 2019-04-10 | High-voltage discharge device and vehicle |
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| CN210062685U true CN210062685U (en) | 2020-02-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271915A (en) * | 2020-10-10 | 2021-01-26 | 广东高标电子科技有限公司 | Pre-charging and discharging method of electric drive controller and electric vehicle |
| CN113212183A (en) * | 2021-06-03 | 2021-08-06 | 阿尔特汽车技术股份有限公司 | Control device and method for motor of new energy vehicle |
-
2019
- 2019-04-10 CN CN201920484635.1U patent/CN210062685U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271915A (en) * | 2020-10-10 | 2021-01-26 | 广东高标电子科技有限公司 | Pre-charging and discharging method of electric drive controller and electric vehicle |
| CN112271915B (en) * | 2020-10-10 | 2022-07-12 | 广东高标电子科技有限公司 | Pre-charging and discharging method of electric drive controller and electric vehicle |
| CN113212183A (en) * | 2021-06-03 | 2021-08-06 | 阿尔特汽车技术股份有限公司 | Control device and method for motor of new energy vehicle |
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