Electric vehicle switch box and electric vehicle power-off control method

Abstract

The present invention provides an electric vehicle switch box, including a relay switch K1, a relay switch K2, a relay control module 1, a monitoring module, a touch power-off switch and a relay control module 2. The relay switch K1 is connected in series to a first circuit, the relay switch K2 is connected in series to a second circuit, the battery is connected in parallel to a plurality of on-board electrical equipment through the first circuit and the second circuit respectively, and the second connection circuit is provided with a manual mechanical power-off master switch. The present invention can realize charging in a state where the manual mechanical power-off master switch is disconnected, and there is no need to wait for the charging to be completed before operating, and the operation convenience is higher. When the manual mechanical power master switch is in a closed state and the key switch is disconnected and the touch power-off switch signal is invalid, the relay control module 2 delays a certain time to control the disconnection of the relay switch K2, realizes passive self-power-off, and prevents the on-board electrical equipment from being connected to the battery for a long time when the manual mechanical power-off master switch is not disconnected, causing the battery to lose power.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy battery application, and more specifically to an electric vehicle switch box and an electric vehicle power-off control method thereof. Background Art

[0002] All buses with a length of 6 meters or more are equipped with a manual mechanical power-off switch that can cut off the battery and all circuit connections. Usually, after the vehicle is charged at night, it will be parked for a long time. Since electric vehicles have more electrical components and consume more power, if the manual mechanical power-off switch is not turned off, it is easy to cause the battery to run out of power, which will cause the vehicle to fail to start. Therefore, manual intervention is required to operate and disconnect the switch when charging is completed. However, in actual use, operators often forget to turn off the manual mechanical power-off switch, and when they use the vehicle the next day, they find that the battery cannot start due to power loss.

[0003] The Chinese utility model patent with the authorization announcement number CN209492395U discloses a low-voltage power distribution control system for new energy commercial vehicles. The patent can realize the distribution of low-voltage power supply for the whole vehicle, power-on and power-off timing control, etc., and can provide power for some electrical equipment when the gate (i.e. the manual mechanical power-off main switch) is disconnected. However, due to the direct connection between some electrical equipment and the battery, the battery is still low when the gate is not disconnected.

[0004] A Chinese utility model patent with authorization announcement number CN211567676U discloses a low-voltage auxiliary power supply control circuit for charging electric vehicles. The patent realizes the power supply of on-board electrical components during charging by adding a voltage stabilizing chip circuit and a relay to the low-voltage power supply circuit. However, the power supply of electrical equipment must pass through a manual mechanical power-off main switch, and charging cannot be performed when the switch is disconnected. It also cannot solve the problem that the battery may run out of power due to long-term parking of the vehicle without manual operation to disconnect the manual mechanical power-off main switch.

[0005] To this end, we provide an electric vehicle switch box and an electric vehicle charging control method using the same. Summary of the invention

[0006] The invention provides an electric vehicle switch box and an electric vehicle power-off control method thereof, so as to overcome the disadvantages of the prior electric vehicle that the battery may be depleted due to long-term parking of the vehicle without manual operation to disconnect the manual mechanical power-off main switch.

[0007] The present invention adopts the following technical solution:

[0008] An electric vehicle switch box, comprising:

[0009] The relay switch K1 is connected in series to the first circuit, and the battery is connected in parallel to a plurality of on-board electrical devices through the first circuit;

[0010] The relay switch K2 is connected in series to the second circuit, and the battery is also connected in parallel to a plurality of the vehicle-mounted electrical devices through the second circuit. The second connection circuit is provided with a manual mechanical power-off main switch;

[0011] Relay control module 1 is electrically connected to the charging socket in the national standard charging mode and the EVCC in the European standard charging mode, and is used to detect the national standard charging wake-up signal output by the charger and the European standard charging wake-up signal output by the EVCC, respectively, so that the control relay switch K1 coil is energized, so that the relay switch K1 is closed, and the on-board electrical equipment can be powered from the battery through K1;

[0012] A monitoring module, used for monitoring the voltage of the first circuit and the voltage of the second circuit, and identifying the state of the manual mechanical power-off main switch by comparison;

[0013] The touch-off switch is interlocked with the key switch signal. The key switch signal takes priority. If the key switch is closed, the touch-off switch is invalid.

[0014] Relay control module 2 is electrically connected to the key switch, the touch power-off switch and the manual mechanical power-off main switch, respectively, and is used to control the relay switch K2; if the manual mechanical power-off main switch is in the disconnected state, the relay module 2 synchronously disconnects the relay switch K2; if the manual mechanical power-off main switch is in the closed state and the key switch is disconnected and the touch power-off switch signal is valid, the relay control module 2 delays and controls to disconnect the relay switch K2 to achieve active self-power-off; if the manual mechanical power-off main switch is in the closed state and the key switch is disconnected and the touch power-off switch signal is invalid, the relay control module 2 delays and controls to disconnect the relay switch K2 to achieve passive self-power-off.

[0015] In a preferred embodiment, the electric vehicle switch box of the present invention further includes an RTC module for receiving remote commands or local commands, and the RTC module is electrically connected to the relay control module 1. The RTC module receives the remote command or local command, outputs a clock wake-up signal, and the relay control module 1 detects the signal, controls the relay K1 coil to close K1, and in the disconnected state of the manual mechanical disconnect switch, the on-board electrical equipment is powered from the battery terminal through K1 to perform remote control or local control.

[0016] In a preferred embodiment, the electric vehicle switch box of the present invention further comprises a temperature and humidity sensor and a battery voltage monitor, and the temperature and humidity sensor and the battery voltage monitor are electrically connected to the monitoring module respectively.

[0017] In a preferred embodiment, the charging compartment door on the electric vehicle of the present invention is provided with a travel switch, and when the charging compartment door is opened, the travel switch is closed, so that the EVCC is powered and in standby mode.

[0018] Furthermore, the above-mentioned travel switch is directly connected to the battery, and the travel switch is also connected to the relay control module 1. The positive output end of the battery is connected to the EVCC through the relay switch K3 and the diode.

[0019] The present invention also provides an electric vehicle power-off control method, comprising the electric vehicle switch box, and the specific steps are as follows:

[0020] S1, keep the relay switch K2 closed, and determine whether the voltage V1 of the first circuit is approximately equal to the voltage V2 of the second circuit. If not, proceed to step S2; if yes, proceed to step S3;

[0021] S2, low power consumption mode, control relay switch K2 to be disconnected, and the on-board electrical equipment is powered off;

[0022] S3, determine whether the key switch is off, if so, proceed to step S4, if not, return to step S1;

[0023] S4, determine whether the touch power-off switch signal is valid, if so, proceed to step S5; if not, proceed to step S6;

[0024] S5, active self-power off, delay T1 time control relay K2 disconnection, vehicle-mounted electrical equipment power off;

[0025] S6, determine whether the voltage V1 of the first circuit is approximately equal to the voltage V2 of the second circuit, if so, proceed to S7, if not, proceed to S2;

[0026] S7, determine whether the delay control of the relay control module 2 to disconnect the relay K2 exceeds T2, if so, go to step S8, if not, return to step S1;

[0027] S8, passive self-power off, control relay switch K2 is disconnected.

[0028] Furthermore, T1 of the above step S5 is preferably 10 s, and T2 of step S7 is preferably 5 min.

[0029] It can be seen from the above description of the present invention that, compared with the prior art, the present invention has the following advantages:

[0030] 1. The electric vehicle switch box of the present invention adds relay switch K1, relay switch K2, relay control module 1 and relay control module 2, which can realize charging in the state of manual mechanical disconnection of the main switch, without waiting for the completion of charging before operation, and the operation is more convenient. In addition, when the manual mechanical power main switch is in the closed state and the key switch is disconnected and the touch power-off switch signal is invalid, the relay control module 2 delays a certain time to control the disconnection of the relay switch K2, realizing passive self-power-off, and preventing the vehicle-mounted electrical equipment from being connected to the battery for a long time when the manual mechanical power-off main switch is not disconnected, causing the battery to lose power.

[0031] 2. The electric vehicle switch box of the present invention is provided with an RTC module for receiving remote commands or local commands, and can realize remote or local control and automatic power-on.

[0032] 3. The electric vehicle switch box of the present invention also integrates a temperature and humidity sensor and a battery voltage monitor to monitor the temperature and humidity signals and the battery voltage in real time. When an abnormality occurs, an alarm can be sounded to actively disconnect the electrical connection between the on-board electrical equipment and the battery to ensure the safety of low-voltage electricity use. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The schematic diagram of the electric vehicle switch box of the present invention is shown in FIG.

[0034] Figure 2 This is a flow chart of the electric vehicle power-off control of the present invention. DETAILED DESCRIPTION

[0035] Refer to the following Figure 1 The specific implementation of the present invention is described. In order to fully understand the present invention, many details are described below, but for those skilled in the art, the present invention can be implemented without these details. For well-known components, methods and processes, they are not described in detail below.

[0036] An electric vehicle switch box, referring to Figure 1 , including: relay switch K1, relay switch K2, relay control module 1, RTC module, monitoring module, touch power off switch 3 and relay control module 2. Among them:

[0037] The relay switch K1 is connected in series to the first circuit 1 , and the battery 4 is connected in parallel to a plurality of vehicle-mounted electrical devices through the first circuit 1 .

[0038] The relay switch K2 is connected in series to the second circuit 2. The battery 4 is also connected in parallel to a plurality of vehicle-mounted electrical devices through the second circuit 2. The second connection circuit 2 is provided with a manual mechanical power-off main switch 5.

[0039] The relay control module 1 is electrically connected to the charging socket in the national standard charging mode and the EVCC in the European standard charging mode, and is used to detect the national standard charging wake-up signal output by the charger and the European standard charging wake-up signal output by the EVCC. The charging compartment door on the electric vehicle is provided with a travel switch, which is directly connected to the battery. The travel switch is also connected to the relay control module 1, and the positive output end of the battery is connected to the EVCC through the relay switch K3 and the diode.

[0040] In the national standard charging mode, when the charging is started by plugging in the gun, the relay control module 1 detects the national standard charging wake-up signal output by the charger, controls the relay switch K1 coil to be energized, and closes the relay switch K1. At this time, regardless of whether the manual mechanical power-off switch 5 is in a closed state, the on-board electrical equipment can be powered from the battery 4 through the relay switch K1, thereby realizing charging in a power-off state. The operator can operate to disconnect the manual mechanical power-off switch 5 after parking, without having to wait for charging to be completed, and the operation is more convenient. After charging is completed, the output of the relay control module 1 is maintained for a certain period of time to ensure that the on-board electrical equipment has enough time to prepare for power-off, further ensuring the safety of low-voltage electricity use.

[0041] In the European standard charging mode, when the charging compartment door is opened, the travel switch is closed, and the EVCC is powered on and in standby mode. When the charging gun is plugged in to start charging, the EVCC outputs a European standard charging wake-up signal. The relay control module 1 detects the signal, controls the relay switch K1 coil to be powered on, and the relay switch K1 is closed. At this time, regardless of whether the manual mechanical power-off main switch is in a closed state, the on-board electrical equipment can be powered from the battery 4 terminal through the relay switch K1, thereby realizing charging in a power-off state. The operator can operate to disconnect the manual mechanical power-off main switch 5 after parking, without having to wait for charging to be completed before operating, which is more convenient to operate. After charging is completed, the output of the relay control module 1 is maintained for a certain period of time to ensure that the on-board electrical equipment has enough time to prepare for power-off, further ensuring the safety of low-voltage electricity use.

[0042] The RTC module is used to receive remote commands or local commands and output a clock wake-up signal. The relay control module detects the signal and controls the relay switch K1 coil to close the relay switch K1. When the manual mechanical disconnect switch 5 is disconnected, the on-board electrical equipment is powered by the battery 4 through the relay switch K1 to perform remote control or local control.

[0043] The monitoring module is used to monitor the voltage of the first circuit 1 and the voltage of the second circuit 2, and to identify the state of the manual mechanical power-off main switch 5 by comparison.

[0044] Touching the power-off switch 3 is interlocked with the key switch 6 signal to prevent accidental touching. The key switch 6 signal takes priority, and when the key switch 6 is closed, touching the power-off switch 3 is invalid.

[0045] The relay control module 2 is electrically connected to the key switch 6, the touch power-off switch 3 and the manual mechanical power-off main switch 5 respectively, and is used to control the relay switch K2.

[0046] If the manual mechanical power-off main switch 5 is in the off state, the relay module 2 simultaneously turns off the relay switch K2 to enter the low power consumption mode.

[0047] If the manual mechanical power main switch 5 is in the closed state, and the key switch is disconnected and the touch power-off switch signal is valid, the relay control module 2 delays a certain time (preferably set to 10s in this embodiment) to control the disconnection of the relay switch K2, thereby achieving active self-power off, and preventing the vehicle-mounted electrical equipment from being connected to the battery 4 for a long time when the manual mechanical power-off main switch 5 is not disconnected, causing the battery 4 to lose power.

[0048] If the manual mechanical power main switch 5 is in the closed state, and the key switch is disconnected 6 and the signal of the power-off switch 3 is invalid, the relay control module 2 delays for a certain time (preferably set to 5 minutes in this embodiment) to control the disconnection of relay K2 to achieve passive self-power-off, thereby preventing the vehicle-mounted electrical equipment from being connected to the battery 4 for a long time when the manual mechanical power-off main switch 5 is not disconnected, causing the battery to run out of power.

[0049] The electric vehicle switch box of the present invention further comprises a temperature and humidity sensor 7 and a battery voltage monitor 8, which are electrically connected to the monitoring module respectively. The temperature and humidity sensor 7 and the battery voltage monitor 8 respectively monitor the temperature and humidity signals and the battery voltage in real time, and can give an alarm when an abnormality occurs, and actively disconnect the electrical connection between the on-board electrical equipment and the battery 4 to ensure the safety of low-voltage electricity use.

[0050] Reference Figure 2 The present invention also provides an electric vehicle power-off control method, comprising the electric vehicle switch box, and the specific steps are as follows:

[0051] S1, keep the relay switch K2 closed, and determine whether the voltage V1 of the first circuit is approximately equal to the voltage V2 of the second circuit. If not, proceed to step S2; if yes, proceed to step S3;

[0052] S2, low power consumption mode, control relay switch K2 to be disconnected, and the on-board electrical equipment is powered off;

[0053] S3, determine whether the key switch is off, if so, proceed to step S4, if not, return to step S1;

[0054] S4, determine whether the touch power-off switch signal is valid, if so, proceed to step S5; if not, proceed to step S6;

[0055] S5, active self-power off, delay T1 time control relay K2 disconnection, vehicle-mounted electrical equipment power off;

[0056] S6, determine whether the voltage V1 of the first circuit is approximately equal to the voltage V2 of the second circuit, if so, proceed to S7, if not, proceed to S2;

[0057] S7, determine whether the delay control of the relay control module 2 to disconnect the relay K2 exceeds T2, if so, go to step S8, if not, return to step S1;

[0058] S8, passive self-power off, control relay switch K2 is disconnected.

[0059] The T1 of the above step S5 is preferably 10 seconds, and the T2 of the step S7 is preferably 5 minutes.

[0060] The above voltage V1 is approximately equal to the voltage V2, which generally means that the absolute value error between the two is within 2V. If it exceeds 2V, it is not "approximately equal".

[0061] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. An electric vehicle switch box, characterized in that: include: The relay switch K1 is connected in series to the first circuit, and the battery is connected in parallel to a plurality of on-board electrical devices through the first circuit; The relay switch K2 is connected in series to the second circuit, and the battery is also connected in parallel to a plurality of the vehicle-mounted electrical devices through the second circuit. The second connection circuit is provided with a manual mechanical power-off main switch; Relay control module 1 is electrically connected to the charging socket in the national standard charging mode and the EVCC in the European standard charging mode, and is used to detect the national standard charging wake-up signal output by the charger and the European standard charging wake-up signal output by the EVCC, respectively, so that the control relay switch K1 coil is energized, so that the relay switch K1 is closed, and the on-board electrical equipment can be powered from the battery through K1; A monitoring module, used for monitoring the voltage of the first circuit and the voltage of the second circuit, and identifying the state of the manual mechanical power-off main switch by comparison; The touch-off switch is interlocked with the key switch signal. The key switch signal takes priority. If the key switch is closed, the touch-off switch is invalid. Relay control module 2 is electrically connected to the key switch, the touch power-off switch and the manual mechanical power-off main switch, respectively, and is used to control the relay switch K2; if the manual mechanical power-off main switch is in the disconnected state, the relay module 2 synchronously disconnects the relay switch K2; if the manual mechanical power-off main switch is in the closed state and the key switch is disconnected and the touch power-off switch signal is valid, the relay control module 2 delays and controls to disconnect the relay switch K2 to achieve active self-power-off; if the manual mechanical power-off main switch is in the closed state and the key switch is disconnected and the touch power-off switch signal is invalid, the relay control module 2 delays and controls to disconnect the relay switch K2 to achieve passive self-power-off.

2. An electric vehicle switch box as claimed in claim 1, characterized in that: It also includes an RTC module for receiving remote commands or local commands, and the RTC module is electrically connected to the relay control module.

3. The electric vehicle switch box according to claim 1, characterized in that: It also includes a temperature and humidity sensor and a battery voltage monitor, and the temperature and humidity sensor and the battery voltage monitor are electrically connected to the monitoring module respectively.

4. The electric vehicle switch box according to claim 1, characterized in that: The charging compartment door is equipped with a travel switch. When the charging compartment door is opened, the travel switch is closed, allowing the EVCC to be powered and put into standby mode.

5. An electric vehicle switch box as claimed in claim 4, characterized in that: The travel switch is directly connected to the battery, and the travel switch is also connected to the relay control module 1. The positive output end of the battery is connected to the EVCC through the relay switch K3 and the diode.

6. A method for controlling power failure of an electric vehicle, comprising an electric vehicle switch box as claimed in claim 1, characterized in that: The specific steps are as follows: S1, keep the relay switch K2 closed, and determine whether the voltage V1 of the first circuit is approximately equal to the voltage V2 of the second circuit. If not, proceed to step S2; if yes, proceed to step S3; S2, low power consumption mode, control relay switch K2 to be disconnected, and the on-board electrical equipment is powered off; S3, determine whether the key switch is off, if so, proceed to step S4, if not, return to step S1; S4, determine whether the touch power-off switch signal is valid, if so, proceed to step S5; if not, proceed to step S6; S5, active self-power off, delay T1 time control relay K2 disconnection, vehicle-mounted electrical equipment power off; S6, determine whether the voltage V1 of the first circuit is approximately equal to the voltage V2 of the second circuit, if so, proceed to S7, if not, proceed to S2; S7, determine whether the delay control of the relay control module 2 to disconnect the relay K2 exceeds T2, if so, go to step S8, if not, return to step S1; S8, passive self-power off, control relay switch K2 is disconnected.

7. The electric vehicle power-off control method according to claim 6, characterized in that: T1 of step S5 is 10 s, and T2 of step S7 is 5 min.

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