Relay adhesion false detection prevention device and electric vehicle

Abstract

The utility model provides a relay adhesion false detection prevention device and an electric automobile, and relates to the technical field of relay control and detection, the relay adhesion false detection prevention device comprises a battery controller, a high-voltage power distribution cabinet and a controllable switch unit, the high-voltage power distribution cabinet comprises a control unit, and a loop relay and an adhesion detection unit are arranged on a loop of the high-voltage power distribution cabinet; the battery controller is connected with the loop relay through the controllable switch unit; the control unit is respectively connected with the battery controller, the adhesion detection unit and the controllable switch unit; and the control unit receives a wake-up signal sent by the battery controller and controls the adhesion detection unit to carry out adhesion detection on the high-voltage power distribution cabinet, and after the adhesion detection unit completes adhesion detection, the control unit controls the controllable switch unit to be switched on, so that the loop relay is closed. According to the device, the controllable switch unit is introduced, it is ensured that the loop relay is closed only after adhesion detection of the high-voltage power distribution cabinet is completed, and the occurrence of adhesion false alarm of the high-voltage power distribution cabinet is effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of relay control and detection, and particularly relates to an anti-relay adhesion misdetection device and an electric vehicle. Background Art

[0002] With the rapid development of new energy vehicles, the battery management system plays an increasingly important role in new energy vehicles. Specifically, the BMS monitors the battery status and manages the battery charging and discharging process to ensure the safety and lifespan of the battery. In the circuit system of new energy vehicles, the main negative relay, as a key component, is responsible for controlling the connection between the battery and the high-voltage circuit. However, during long-term use, the main negative relay may experience an adhesion failure, resulting in the relay being unable to disconnect properly, thereby posing a safety hazard.

[0003] Existing methods for detecting the adhesion of the main negative relay usually directly control the opening and closing state of the relay through the battery management system and determine whether the relay is adhered by detecting current or voltage changes. However, since the battery management system is connected to the relay by hard wires and the relay is located inside the high-voltage power distribution cabinet, there are certain delays and errors in the detection process, which may result in false alarms of adhesion. Inaccurate detection of relay adhesion will increase the risk of accidents and also cause unnecessary inspections and repairs, increasing the maintenance cost. Summary of the Utility Model

[0004] In view of the deficiencies of the above-mentioned prior art, the utility model provides an anti-relay adhesion misdetection device and an electric vehicle, which solve the technical problem of easy false alarms of adhesion during the detection of relay adhesion in the prior art due to the influence of delay.

[0005] On the one hand, the utility model provides an anti-relay adhesion misdetection device, which includes a battery controller, a high-voltage power distribution cabinet, and a controllable switch unit. The high-voltage power distribution cabinet includes a control unit, and a circuit relay and an adhesion detection unit are arranged on the circuit of the high-voltage power distribution cabinet;

[0006] The battery controller is connected to the circuit relay through the controllable switch unit;

[0007] The control unit is respectively connected to the battery controller, the adhesion detection unit, and the controllable switch unit;

[0008] The control unit receives the wake-up signal sent by the battery controller, controls the adhesion detection unit to perform adhesion detection on the high-voltage power distribution cabinet, and after the adhesion detection unit completes the adhesion detection, the control unit controls the controllable switch unit to conduct, so that the circuit relay closes.

[0009] Optionally, the controllable switch unit is a relay.

[0010] Optionally, the controllable switch unit is arranged inside the high-voltage power distribution cabinet.

[0011] Optionally, the circuit of the high-voltage power distribution cabinet includes a positive circuit and a negative circuit;

[0012] The circuit relay is arranged on the negative circuit;

[0013] One end of the adhesion detection unit is arranged on the positive circuit, and the other end of the adhesion detection unit is arranged on the negative circuit. The adhesion detection unit is used for measuring the voltage value between the positive circuit and the negative circuit.

[0014] Optionally, the adhesion detection unit is a voltage sensor.

[0015] Optionally, the adhesion detection unit is used for comparing the voltage value between the positive circuit and the negative circuit with the voltage value of the wake-up signal sent by the battery controller to obtain a voltage difference;

[0016] When the voltage difference is greater than a preset voltage difference threshold, the adhesion detection unit determines that the circuit relay is disconnected;

[0017] When the voltage difference is less than or equal to the preset voltage difference threshold, the adhesion detection unit determines that the circuit relay is closed.

[0018] Optionally, the high-voltage power distribution cabinet is also connected with a plurality of lithium batteries;

[0019] The positive electrodes of the plurality of lithium batteries are connected to the positive circuit;

[0020] The negative electrodes of the plurality of lithium batteries are connected to the negative circuit.

[0021] Optionally, the device further includes a vehicle controller;

[0022] The vehicle controller is connected to the battery controller through a first hard wire and is used for waking up the battery controller;

[0023] The vehicle controller is connected to the high-voltage power distribution cabinet through a second hard wire and is used for waking up the high-voltage power distribution cabinet.

[0024] Optionally, the battery controller, the high-voltage power distribution cabinet and the vehicle controller communicate through a local area network.

[0025] On the other hand, the present utility model provides an electric vehicle, including the anti-relay adhesion misdetection device as described in any one of the above.

[0026] The anti-relay adhesion misdetection device and electric vehicle provided by the present utility model, the control unit pre-uses the adhesion detection unit to detect the adhesion of the high-voltage power distribution cabinet according to the received wake-up signal. At this time, the controllable switch unit is in the off state, so that the circuit relay in the high-voltage power distribution cabinet is also in the off state, effectively preventing the circuit relay from immediately closing to form a path when the battery controller sends a wake-up signal. Affected by the delay, if the adhesion detection of the high-voltage power distribution cabinet is carried out after the circuit relay is closed, adhesion false alarms will occur and the true adhesion state of the circuit relay cannot be accurately understood. And the controllable switch unit is controlled to conduct only after the adhesion detection unit completes the adhesion detection, and then the circuit relay is controlled to close to complete the wake-up of the high-voltage power distribution cabinet. The above device introduces a controllable switch unit to ensure that the circuit relay is closed only after the adhesion detection of the high-voltage power distribution cabinet is completed, effectively preventing the occurrence of adhesion false alarms in the high-voltage power distribution cabinet.

[0027] Other features and advantages of the present utility model will be described in the following specification, and part of them will become obvious from the specification or be understood by implementing the present utility model. The purpose and other advantages of the present utility model can be realized and obtained by the structure specifically pointed out in the written specification, claims, and drawings.

[0028] The technical solution of the present utility model will be further described in detail below through the drawings and embodiments. Description of the Drawings

[0029] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0030] Figure 1 It is a schematic connection diagram of the anti-relay adhesion misdetection device in an embodiment provided by the present application;

[0031] Figure 2 It is a schematic specific structure diagram of the anti-relay adhesion misdetection device in an embodiment provided by the present application.

[0032] In the figure:

[0033] 1. Battery controller;

[0034] 2. High-voltage power distribution cabinet; 201. Circuit relay; 202. Adhesion detection unit; 203. Positive circuit; 204. Negative circuit;

[0035] 3. Controllable switch unit;

[0036] 4. Vehicle controller; 401. First hard wire; 402. Second hard wire

[0037] 5. Lithium battery;

[0038] 6. Local area network. Detailed implementation manner

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more, unless otherwise specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] On the one hand, the present invention provides a device for preventing misdetection of relay adhesion, as Figure 1 shown, including a battery controller 1, a high-voltage power distribution cabinet 2, and a controllable switch unit 3. The high-voltage power distribution cabinet 2 includes a control unit. A circuit relay 201 and an adhesion detection unit 202 are arranged on the circuit of the high-voltage power distribution cabinet 2; the battery controller 1 is connected to the circuit relay 201 through the controllable switch unit 3; the control unit is respectively connected to the battery controller 1, the adhesion detection unit 202, and the controllable switch unit 3; the control unit receives the wake-up signal sent by the battery controller 1, and controls the adhesion detection unit 202 to perform adhesion detection on the high-voltage power distribution cabinet 2. After the adhesion detection unit 202 completes the adhesion detection, the control unit controls the controllable switch unit 3 to conduct, so that the circuit relay 201 closes.

[0043] The anti-relay adhesion misdetection device provided by the present utility model. The control unit pre-uses the adhesion detection unit 202 to detect the adhesion of the high-voltage power distribution cabinet 2 according to the received wake-up signal. At this time, the controllable switch unit 3 is in the off state, so that the circuit relay 201 in the high-voltage power distribution cabinet 2 is also in the off state, effectively preventing the circuit relay 201 from immediately closing to form a path when the battery controller 1 sends a wake-up signal. Affected by the delay, if the adhesion detection of the high-voltage power distribution cabinet 2 is performed after the circuit relay 201 is closed, adhesion false alarms will occur, and the true adhesion state of the circuit relay 201 cannot be accurately understood. After the adhesion detection unit 202 completes the adhesion detection, the controllable switch unit 3 is controlled to conduct, and then the circuit relay 201 is controlled to close to complete the wake-up of the high-voltage power distribution cabinet 2. The above device introduces the controllable switch unit 3 to ensure that the circuit relay 201 is closed only after the adhesion detection of the high-voltage power distribution cabinet 2 is completed, effectively preventing the occurrence of adhesion false alarms in the high-voltage power distribution cabinet 2.

[0044] Among them, the battery controller (BMS, Battery Management System) is an electronic system used to manage and control battery packs, mainly applied in electric vehicles, energy storage systems and other applications that require efficient battery management. Its main functions are to monitor battery status, protect the battery, balance battery cells, control battery charging and discharging, and communicate with other systems or functional modules.

[0045] Specifically, the control unit can receive the wake-up signal, control the adhesion detection unit 202 to perform adhesion detection, and control the controllable switch unit 3. The control unit can be specifically implemented in other forms such as a microcontroller (MCU), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), and a digital signal processor (DSP). This application does not make specific restrictions.

[0046] Furthermore, the controllable switch unit 3 is a relay.

[0047] In this embodiment, as a mature electromechanical component, the relay has good reliability and stability and is suitable for application in high-voltage circuits; the relay usually adopts an electromagnetic drive method, providing good electrical isolation for the high-voltage circuit and improving the safety of the device; and the control logic of the relay is simple, the response speed is fast, the structure is simple, the cost is low, and it is easy to implement.

[0048] Furthermore, the controllable switch unit 3 is arranged in the high-voltage power distribution cabinet 2.

[0049] In this embodiment, placing the controllable switch unit 3 inside the high-voltage power distribution cabinet 2 can reduce external connections and the potential safety hazards caused by components exposed to the outside. The built-in controllable switch unit 3 can be better protected by the shell of the high-voltage power distribution cabinet 2, avoiding damage caused by external environmental factors. Building the controllable switch unit 3 inside can simplify the wiring inside the high-voltage power distribution cabinet 2, reduce the length and complexity of the wire harness, and avoid the possibility of failures caused by too long or improperly arranged wire harnesses. The built-in controllable switch unit 3 can improve the overall reliability and consistency of the high-voltage power distribution cabinet 2, making it easy to maintain and replace, reducing the possibility of human operation errors, and can also optimize the space layout of the high-voltage power distribution cabinet 2 in the limited space of the electric vehicle, improving space utilization.

[0050] Specifically, in the above embodiment, as Figure 2 shown, the circuit of the high-voltage power distribution cabinet 2 includes a positive circuit 203 and a negative circuit 204; the circuit relay 201 is arranged on the negative circuit 204; one end of the adhesion detection unit 202 is arranged on the positive circuit 203, and the other end of the adhesion detection unit 202 is arranged on the negative circuit 204. The adhesion detection unit 202 is used to measure the voltage value between the positive circuit 203 and the negative circuit 204.

[0051] In this embodiment, by directly measuring the voltage difference between the positive circuit 203 and the negative circuit 204 through the adhesion detection unit 202, it is possible to more accurately determine whether the circuit relay 201 has adhered. Compared with indirect measurement methods such as detecting current changes, the adhesion detection unit 202 reduces the delay and error in the measurement process, reduces the possibility of false alarms, improves the accuracy and reliability of the measurement, and obtaining accurate measurement results helps to ensure that the circuit relay 201 will not be closed before the adhesion is eliminated, thereby improving the safety of the entire device.

[0052] Furthermore, the adhesion detection unit 202 is a voltage sensor.

[0053] In this embodiment, the adhesion detection unit 202 is selected as a voltage sensor, and the voltage sensor has high precision, can accurately measure voltage signals, can also quickly respond to voltage changes, is suitable for dynamic measurement, shows a good linear relationship within the measurement range, and at the same time covers a wide frequency range, being suitable for voltage signals of different frequencies.

[0054] Furthermore, the adhesion detection unit 202 is used to compare the voltage value between the positive circuit 203 and the negative circuit 204 with the voltage value of the wake-up signal sent by the battery controller 1 to obtain a voltage difference value; when the voltage difference value is greater than a preset voltage difference threshold, the adhesion detection unit 202 determines that the circuit relay 201 is disconnected; when the voltage difference value is less than or equal to the preset voltage difference threshold, the adhesion detection unit 202 determines that the circuit relay 201 is closed.

[0055] In this embodiment, after the adhesion detection unit 202 detects the voltage value between the positive electrode circuit 203 and the negative electrode circuit 204, it needs to compare it with the voltage value of the wake-up signal, and then judge whether the circuit relay 201 is adhered according to the difference between the two voltage values. That is, when the voltage difference is greater than the preset voltage difference threshold, it means that the voltage difference between the two voltages is large, and the circuit relay 201 is in the open state, and the circuit relay 201 is in the normal state; when the voltage difference is less than or equal to the preset voltage difference threshold, it means that the voltage difference between the two voltages is small or zero, and the circuit relay 201 is in the closed state, and the circuit relay 201 is in the adhered state. And the judgment of the state of the circuit relay 201 in this application is realized before the battery controller 1 controls the circuit relay 201 to close, effectively preventing false alarms of the adhered state of the circuit relay 201.

[0056] Furthermore, the high-voltage power distribution cabinet 2 is also connected with a plurality of lithium batteries 5; the positive electrodes of the plurality of lithium batteries 5 are connected to the positive electrode circuit 203; the negative electrodes of the plurality of lithium batteries 5 are connected to the negative electrode circuit 204.

[0057] In this embodiment, the high-voltage power distribution cabinet 2 is connected with a plurality of lithium batteries 5, effectively improving the energy density of the entire battery system; through the high-voltage power distribution cabinet 2, the energy distribution of the plurality of lithium batteries 5 can be managed more effectively, ensuring that each lithium battery 5 in the battery pack can be fully utilized, optimizing the performance and efficiency of the entire battery system, preventing overcharging or over-discharging phenomena, improving the safety of the device, and ensuring the reliability and durability of the entire battery system.

[0058] Specifically, in the above embodiment, as Figure 2 shown, the device further includes a vehicle controller 4; the vehicle controller 4 is connected to the battery controller 1 through a first hard wire 401 and is used to wake up the battery controller 1; the vehicle controller 4 is connected to the high-voltage power distribution cabinet 2 through a second hard wire 402 and is used to wake up the high-voltage power distribution cabinet 2.

[0059] In this embodiment, the vehicle control unit (VCU) is the core control component in new energy vehicles and plays a crucial role in pure electric vehicles and plug-in hybrid vehicles. The vehicle control unit 4 is responsible for monitoring and coordinating the operation of each subsystem to ensure that the vehicle operates safely and efficiently according to the driver's intention. The vehicle control unit 4 calculates the optimal control strategy based on the data information by collecting data from various sensors, such as the accelerator pedal position sensor, the brake pedal position sensor, the motor controller, and the battery management system. The vehicle control unit 4 mainly realizes power management, energy recovery, fault diagnosis and handling, network management, vehicle status monitoring, driving mode switching, and safety control, etc. The vehicle control unit 4 quickly wakes up the battery controller 1 and the high-voltage power distribution cabinet 2 through hardwired connections, reducing signal transmission delay, enhancing system stability, and simplifying system design. Moreover, hardwired connections are easy to integrate with the existing vehicle architecture and can be easily embedded into the existing electrical system without complex additional hardware.

[0060] Furthermore, as Figure 2 shown, the battery controller 1, the high-voltage power distribution cabinet 2, and the vehicle control unit 4 communicate through the local area network 6.

[0061] In this embodiment, the local area network (CAN, Controller Area Network) is a serial communication protocol for real-time communication, providing a fast and reliable communication method, making the data exchange between each controller more efficient, simplifying the communication between each controller, and improving the system response speed.

[0062] On the other hand, the present utility model provides an electric vehicle including the anti-relay adhesion misdetection device as described above.

[0063] The electric vehicle provided by the present utility model is equipped with an anti-relay adhesion misdetection device. By accurately detecting whether the contactor is adhered, it is possible to prevent circuit abnormalities caused by adhesion, such as safety hazards like over-discharge and overheating. The adhesion detection unit 202 pre-measures the loop voltage of the high-voltage power distribution cabinet 2 to determine the adhesion state of the loop relay 201, and then controls the loop relay 201 to close to wake up the high-voltage power distribution cabinet 2, reducing the influence of delay and error in the adhesion detection process on the false alarm of the high-voltage power distribution cabinet 2. And accurate adhesion detection helps to ensure that the loop relay 201 continues to close only when it is confirmed that the loop relay 201 is not adhered, thereby improving the safety of the entire system. At the same time, directly measuring the voltage of the loop can improve the accuracy and reliability of the detection.

[0064] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and their equivalent technologies, the present utility model is also intended to include these modifications and variations.

Claims

1. A device for preventing relay adhesion misdetection, characterized in that: It comprises a battery controller (1), a high-voltage power distribution cabinet (2), and a controllable switch unit (3); the high-voltage power distribution cabinet (2) comprises a control unit; and a loop relay (201) and an adhesion detection unit (202) are provided on the loop of the high-voltage power distribution cabinet (2); The battery controller (1) is connected to the loop relay (201) via the controllable switch unit (3); The control unit is connected to the battery controller (1), the adhesion detection unit (202) and the controllable switch unit (3) respectively; The control unit receives a wake-up signal sent by the battery controller (1), and controls the adhesion detection unit (202) to perform adhesion detection on the high-voltage power distribution cabinet (2); after the adhesion detection unit (202) completes the adhesion detection, the control unit controls the controllable switch unit (3) to be turned on, so that the loop relay (201) is closed.

2. The device for preventing relay adhesion misdetection according to claim 1, characterized in that: The controllable switch unit (3) is a relay.

3. The device for preventing relay adhesion misdetection according to claim 1 or 2, characterized in that: The controllable switch unit (3) is arranged in the high-voltage power distribution cabinet (2).

4. The device for preventing relay adhesion misdetection according to claim 1, characterized in that: The circuit of the high-voltage power distribution cabinet (2) comprises a positive circuit (203) and a negative circuit (204); The loop relay (201) is arranged on the negative pole loop (204); One end of the adhesion detection unit (202) is arranged on the positive electrode loop (203), and the other end of the adhesion detection unit (202) is arranged on the negative electrode loop (204); the adhesion detection unit (202) is used to measure the voltage value between the positive electrode loop (203) and the negative electrode loop (204).

5. The device for preventing relay adhesion misdetection according to claim 4, characterized in that: The adhesion detection unit (202) is a voltage sensor.

6. The device for preventing relay adhesion misdetection according to claim 4, characterized in that: The adhesion detection unit (202) is used to compare the voltage value between the positive electrode circuit (203) and the negative electrode circuit (204) with the voltage value of the wake-up signal sent by the battery controller (1) to obtain a voltage difference; When the voltage difference value is greater than a preset voltage difference threshold, the adhesion detection unit (202) determines that the loop relay (201) is disconnected; When the voltage difference value is less than or equal to a preset voltage difference threshold, the adhesion detection unit (202) determines that the loop relay (201) is closed.

7. The device for preventing relay adhesion misdetection according to claim 4, characterized in that: The high-voltage power distribution cabinet (2) is also connected to a plurality of lithium batteries (5); The positive electrodes of the plurality of lithium batteries (5) are connected to the positive electrode circuit (203); The negative electrodes of the plurality of lithium batteries (5) are connected to the negative electrode circuit (204).

8. The device for preventing relay adhesion misdetection according to claim 1, characterized in that: The device also includes a vehicle controller (4); The vehicle controller (4) is connected to the battery controller (1) via a first hard line (401) and is used to wake up the battery controller (1); The vehicle controller (4) is connected to the high-voltage power distribution cabinet (2) via a second hard line (402) and is used to wake up the high-voltage power distribution cabinet (2).

9. The device for preventing relay adhesion misdetection according to claim 8, characterized in that: The battery controller (1), the high-voltage power distribution cabinet (2) and the vehicle controller (4) communicate via a local area network (6).

10. An electric vehicle, characterized in that: It comprises the device for preventing relay adhesion misdetection as claimed in any one of claims 1 to 9.

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