Low-voltage power supply device and method for electric vehicle and electric vehicle

Abstract

The present invention relates to the field of electric vehicles and provides a low-voltage power supply device and method for electric vehicles, and an electric vehicle. The device includes: a first start-stop control unit, a second start-stop control unit, an ignition switch, a low-voltage battery, a first power supply control unit, and a second power supply control unit; the low-voltage battery and the first power supply control unit are integrated into the same box; the first start-stop control unit is arranged in the vehicle power distribution circuit of the low-voltage battery, and the low-voltage battery is connected to the first power supply control unit through the second start-stop control unit; the first power supply control unit is used to output a first control signal to the first start-stop control unit when the second start-stop control unit is closed; the second power supply control unit is used to output a second control signal to the first start-stop control unit when the vehicle power distribution circuit is connected, and is also used to determine whether to stop outputting the second control signal when the electric vehicle is powered off. The present invention can effectively ensure driving safety and reduce the cost of electric vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a low-voltage power supply device and method for an electric vehicle, and an electric vehicle. Background Art

[0002] Electric vehicles are experiencing rapid growth due to their environmentally friendly, energy-saving, and low-noise advantages. The power source for an electric vehicle typically consists of a power battery and a low-voltage battery. The low-voltage battery supplies power to the vehicle's low-voltage systems and provides communication signals. The power battery also provides power to the vehicle. Simultaneously, the power battery charges the low-voltage battery via a DCDC (Direct Current Direct Current) converter.

[0003] Existing electric vehicles typically control the power supply to the low-voltage battery through its internal control circuit. However, if a fault occurs in this circuit, the low-voltage battery will be unable to properly power the electric vehicle, which can easily cause accidents and compromise driving safety. Furthermore, the DC-DC converter in existing electric vehicles is typically integrated within an all-in-one unit, with the DC-DC converter and low-voltage battery independently controlled by separate control boards, significantly increasing the cost of the electric vehicle. Summary of the Invention

[0004] The present invention provides a low-voltage power supply device and method for an electric vehicle, and an electric vehicle, to solve the defects of the prior art electric vehicles, such as high cost and inability to ensure driving safety, thereby effectively reducing the cost of the electric vehicle and effectively improving driving safety.

[0005] The present invention provides a low-voltage power supply device for an electric vehicle, comprising: a first start-stop control unit, a second start-stop control unit, an ignition switch, a low-voltage battery, a first power supply control unit, and a second power supply control unit; the low-voltage battery and the first power supply control unit are integrated into the same box;

[0006] The first start-stop control unit is arranged in the vehicle power distribution circuit of the low-voltage battery, and is used to control the on-off of the vehicle power distribution circuit;

[0007] The low-voltage battery is connected to the first power supply control unit through the second start-stop control unit, and the low-voltage battery supplies power to the first power supply control unit when the second start-stop control unit is closed;

[0008] The first power supply control unit is connected to the first start-stop control unit, and is configured to output a first control signal to the first start-stop control unit when the second start-stop control unit is closed; the first control signal is used to control the first start-stop control unit to be closed;

[0009] The ignition switch is connected to the output end of the vehicle power distribution circuit, and is used to control the power supply of the electric vehicle when the ignition switch is turned to the ON position;

[0010] The second power supply control unit is connected to the output end of the vehicle power distribution circuit, and is also connected to the first start-stop control unit and the ON gear output end of the ignition switch. It is used to output a second control signal to the first start-stop control unit when the vehicle power distribution circuit is turned on, and is also used to monitor the output signal of the ON gear output end, and stop outputting the second control signal to the first start-stop control unit when it is determined that the electric vehicle is powered off according to the output signal of the ON gear output end; wherein, the second control signal is used to control the first start-stop control unit to remain in a closed state.

[0011] According to the low-voltage power supply device for electric vehicles provided by the present invention, the first power supply control unit is further connected to the output end of the vehicle power distribution circuit and the power battery of the electric vehicle;

[0012] The first power supply control unit is used to obtain the output signal of the output end of the vehicle power distribution circuit, and when it is determined based on the output signal that the low-voltage battery has failed, send a first request signal to the power battery, and the first request signal is used to control the power battery to output a first voltage signal to the first power supply control unit; the first power supply control unit is also used to convert the first voltage signal into a power supply voltage and output it through the output end of the vehicle power distribution circuit.

[0013] According to the low-voltage power supply device for electric vehicles provided by the present invention, the first power supply control unit is further connected to the second power supply control unit, and is configured to stop outputting the first control signal to the first start-stop control unit when determining that a fault occurs in the low-voltage battery, and to send a fault signal to the second power supply control unit;

[0014] The second power supply control unit is further configured to stop outputting the second control signal to the first start-stop control unit upon receiving the fault signal.

[0015] According to the low-voltage power supply device for an electric vehicle provided by the present invention, the first power supply control unit is further configured to obtain operating status data of the low-voltage battery, and when determining based on the operating status data that the low-voltage battery meets charging conditions, send a second request signal to the power battery, wherein the second request signal is configured to control the power battery to output a second voltage signal to the first power supply control unit;

[0016] The first power supply control unit is further configured to convert the second voltage signal into a charging voltage, and the charging voltage is used to charge the low-voltage battery.

[0017] According to the low-voltage power supply device for electric vehicles provided by the present invention, a first anti-reverse module is provided between the first power supply control unit and the first start-stop control unit, and a second anti-reverse module is provided between the second power supply control unit and the first start-stop control unit.

[0018] The low-voltage power supply device for an electric vehicle provided by the present invention further includes a third start-stop control unit and a fourth start-stop control unit;

[0019] The first end of the third start-stop control unit and the first end of the fourth start-stop control unit are both connected to the output end of the vehicle power distribution circuit; the second end of the third start-stop control unit and the second end of the fourth start-stop control unit are respectively connected to the first power consumer and the second power consumer; the third end of the third start-stop control unit and the third end of the fourth start-stop control unit are both connected to the ON gear output end of the ignition switch;

[0020] When the ignition switch is turned to the ON position, it is used to control the closure of the third start-stop control unit and the fourth start-stop control unit; the third start-stop control unit is used to control the on-off of the first power supply line between the output end of the vehicle power distribution circuit and the first electrical equipment; the fourth start-stop control unit is used to control the on-off of the second power supply line between the output end of the vehicle power distribution circuit and the second electrical equipment; wherein, the first electrical equipment is a driving-related control device, and the second electrical equipment is a non-driving-related control device.

[0021] According to the low-voltage power supply device for electric vehicles provided by the present invention, the first power supply control unit is also used to obtain an electrical signal on the second power supply line, and when it is determined based on the electrical signal that the second power supply line is disconnected, stop outputting the first control signal to the first start-stop control unit.

[0022] The low-voltage power supply device for an electric vehicle provided by the present invention further includes a fifth start-stop control unit; a first end of the fifth start-stop control unit is connected to the output end of the vehicle power distribution circuit, a second end of the fifth start-stop control unit is connected to a third electrical device, and the fifth start-stop control unit is used to control the on-off of the third power supply line between the output end of the vehicle power distribution circuit and the third electrical device;

[0023] And / or, it also includes a sixth start-stop control unit; the first end of the sixth start-stop control unit is connected to the output end of the vehicle power distribution circuit, the second end of the sixth start-stop control unit is connected to the fourth electrical equipment, and the third end of the sixth start-stop control unit is connected to the ACC gear output end of the ignition switch, and is used to control the closing of the sixth start-stop control unit when the ignition switch is turned to the ACC gear; the sixth start-stop control unit is used to control the on-off of the fourth power supply line between the output end of the vehicle power distribution circuit and the fourth electrical equipment.

[0024] The present invention also provides a low-voltage power supply method for an electric vehicle, comprising:

[0025] The first power supply control unit outputs a first control signal to the first start-stop control unit when the second start-stop control unit is closed; wherein, the first control signal is used to control the closure of the first start-stop control unit; the first start-stop control unit is arranged in the vehicle power distribution circuit of the low-voltage battery, and is used to control the on-off of the vehicle power distribution circuit; the low-voltage battery is connected to the first power supply control unit through the second start-stop control unit, and when the second start-stop control unit is closed, the low-voltage battery supplies power to the first power supply control unit; the low-voltage battery and the first power supply control unit are integrated into the same box;

[0026] The second power supply control unit outputs a second control signal to the first start-stop control unit when the vehicle power distribution circuit is turned on; wherein the second power supply control unit is connected to the output end of the vehicle power distribution circuit, and the second control signal is used to control the first start-stop control unit to remain in a closed state;

[0027] The second power supply control unit monitors the output signal of the ON gear output terminal of the ignition switch, and stops outputting the second control signal to the first start-stop control unit when determining that the electric vehicle is powered off based on the output signal of the ON gear output terminal.

[0028] The present invention also provides an electric vehicle, comprising any one of the above-described low-voltage power supply devices for the electric vehicle.

[0029] The low-voltage power supply device, method, and electric vehicle provided by the present invention integrate a low-voltage battery and a first power supply control unit into the same housing. When the low-voltage battery supplies power to the first power supply control unit, the first power supply control unit outputs a first control signal to the first start-stop control unit to control the first start-stop control unit to close, thereby controlling the conduction of the vehicle's power distribution circuit. This allows the first power supply control unit to control the power supply of the low-voltage battery, reducing the use of control boards in the low-voltage battery and greatly reducing the cost of the electric vehicle. At the same time, the second power supply control unit outputs a second control signal to the first start-stop control unit when the vehicle's power distribution circuit is connected to control the first start-stop control unit to maintain a closed state. The second power supply control unit also detects an output signal from an ON-position output terminal of the ignition switch and, based on the output signal from the ON-position output terminal, determines to stop outputting the second control signal to the first start-stop control unit when the electric vehicle is powered off. Through the dual control of the low-voltage battery power supply by the first and second power supply control units, the low-voltage battery can still be guaranteed to supply power normally when a failure occurs in the control board in the first power supply control unit, thereby ensuring driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is one of the structural diagrams of the low-voltage power supply device for electric vehicles provided by an embodiment of the present invention;

[0032] Figure 2 This is the second structural diagram of the low-voltage power supply device for electric vehicles provided by an embodiment of the present invention;

[0033] Figure 3 This is the third structural diagram of the low-voltage power supply device for electric vehicles provided by an embodiment of the present invention;

[0034] Figure 4 This is the fourth structural diagram of the low-voltage power supply device for electric vehicles provided by an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the working process of the low-voltage power supply device for electric vehicles provided by an embodiment of the present invention;

[0036] Figure 6 1 is a flow chart of a low-voltage power supply method for an electric vehicle provided by an embodiment of the present invention;

[0037] Reference numerals:

[0038] 101: First start-stop control unit; 102: Second start-stop control unit; 103: Low-voltage battery; 104: First power supply control unit; 105: Ignition switch; 106: Second power supply control unit; 201: Third start-stop control unit; 202: Fourth start-stop control unit; 203: First electrical device; 204: Second electrical device; 301: Fifth start-stop control unit; 302: Sixth start-stop control unit; 303: Third electrical device; 304: Fourth electrical device; 401: First fuse; 402: Second fuse; 403: Third fuse; 404: Fuse box; 405: Fourth fuse; 406: Fifth fuse; 407: First diode; 408: Second diode; 409: Current sensor; 410: Voltage acquisition harness; 411: Current acquisition harness; 412: Temperature acquisition harness. DETAILED DESCRIPTION

[0039] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0040] The following combination Figure 1-Figure 5 The low-voltage power supply device for electric vehicles of the present invention is described. The low-voltage power supply device for electric vehicles of the present invention is used to provide low-voltage electricity for the entire electric vehicle. Figure 1 As shown, the low-voltage power supply device for electric vehicles of the present invention at least includes:

[0041] A first start-stop control unit 101, a second start-stop control unit 102, an ignition switch 105, a low-voltage battery 103, a first power supply control unit 104 and a second power supply control unit 106; the low-voltage battery 103 and the first power supply control unit 104 are integrated into the same box;

[0042] The first start-stop control unit 101 is provided in the vehicle power distribution circuit of the low-voltage battery 103 and is used to control the on-off of the vehicle power distribution circuit;

[0043] The low-voltage battery 103 is connected to the first power supply control unit 104 through the second start-stop control unit 102. When the second start-stop control unit 102 is closed, the low-voltage battery 103 supplies power to the first power supply control unit 104.

[0044] The first power supply control unit 104 is connected to the first start-stop control unit 101 and is configured to output a first control signal to the first start-stop control unit 101 when the second start-stop control unit 102 is closed; the first control signal is used to control the first start-stop control unit 101 to be closed;

[0045] The ignition switch 105 is connected to the output end of the vehicle power distribution circuit, and is used to control the electric vehicle to power on when the ignition switch 105 is turned to the ON position;

[0046] The second power supply control unit 106 is connected to the output end of the vehicle power distribution circuit, and is also connected to the first start-stop control unit 101 and the ON gear output end signal of the ignition switch 105. It is used to output a second control signal to the first start-stop control unit 101 when the vehicle power distribution circuit is turned on, and is also used to monitor the output signal of the ON gear output end, and stop outputting the second control signal to the first start-stop control unit 101 when it is determined that the electric vehicle is powered off according to the output signal of the ON gear output end; wherein, the second control signal is used to control the first start-stop control unit 101 to remain in a closed state.

[0047] In this embodiment, the low-voltage battery 103 is used to provide low-voltage electricity to the entire electric vehicle. For example, it can be a 24V low-voltage lithium battery. The first power supply control unit 104 and the second power supply control unit 106 are used to control the power supply process of the low-voltage battery 103. At the same time, the first power supply control unit 104 can also convert the output voltage of the electric vehicle's power battery into the charging voltage of the low-voltage battery 103 to charge the low-voltage battery 103. The second power supply control unit 106 can be the electric vehicle's own controller, such as the vehicle controller, or a newly added controller. The low-voltage battery 103 and the first power supply control unit 104 are integrated into the same housing. For example, the low-voltage battery 103 and the first power supply control unit 104 can be integrated into a non-standard housing. The non-standard housing can be individually numbered and installed as close to the vehicle frame to minimize the low-voltage line. This allows the power supply of the low-voltage battery 103 to be controlled by the control board of the first power supply control unit 104 itself, effectively reducing the cost of the electric vehicle. At the same time, this embodiment integrates the low-voltage battery 103 and the first power supply control unit 104 in the same box, and the low-voltage battery 103 and the first power supply control unit 104 can be connected through a copper bus, eliminating the 25 square power line and further reducing the cost and weight of the electric vehicle.

[0048] The first start-stop control unit 101 is arranged in the vehicle power distribution circuit of the low-voltage battery 103, and is used to control the conduction and disconnection of the vehicle power distribution circuit. The vehicle power distribution circuit may include the low-voltage battery 103 and the first start-stop control unit 101. When the first start-stop control unit 101 is closed, the vehicle power distribution circuit is conducted, and the output end of the vehicle power distribution circuit outputs normal power. When the first start-stop control unit 101 is disconnected, the vehicle power distribution circuit is disconnected, and the vehicle power distribution circuit stops outputting normal power.

[0049] The low-voltage battery 103 is connected to the first power supply control unit 104 via the second start-stop control unit 102. The second start-stop control unit 102 controls the low-voltage battery 103 to supply or stop power to the first power supply control unit 104. In actual use, the second start-stop control unit 102, the first power supply control unit 104, and the low-voltage battery 103 are connected in series to form a power supply circuit. When the second start-stop control unit 102 is closed, the power supply circuit is connected, and the low-voltage battery 103 supplies power to the first power supply control unit 104, causing the first power supply control unit 104 to enter an operating mode. When the second start-stop control unit 102 is disconnected, the low-voltage battery 103 stops supplying power to the first power supply control unit 104, causing the first power supply control unit 104 to cease operation. Simultaneously, the first power supply control unit 104 stops outputting the first control signal to the first start-stop control unit 101. The second start-stop control unit 102 can be a manually controlled switch, for example, a self-reset switch that closes when pressed for 3 seconds and opens when pressed for 5 seconds.

[0050] Ignition switch 105 is connected to the output of the vehicle's power distribution circuit. When the vehicle's power distribution circuit is on, constant power is input to ignition switch 105. When ignition switch 105 is turned to the ON position, ignition switch 105 outputs an ON signal to power on the electric vehicle. Ignition switch 105 can be connected to the output of the vehicle's power distribution circuit via a fuse to prevent damage to ignition switch 105 from short circuits.

[0051] The first power supply control unit 104 is connected to the first start-stop control unit 101 by signal. When the second start-stop control unit 102 is closed, the first power supply control unit 104 enters the working mode and outputs a first control signal to the first start-stop control unit 101. The first power supply control unit 104 can determine whether the low-voltage battery 103 meets the power supply conditions after entering the working mode. For example, the low-voltage battery 103 can be controlled to perform a self-test. If there is no fault in the self-test, it indicates that the power supply conditions are met. When there is a fault in the low-voltage battery 103, a fault prompt can be given. For example, the fault light can be controlled to light up to remind the operator to troubleshoot the fault. The fault prompt information can also be sent to the second power supply control unit 106 and / or the central control screen of the electric vehicle via the CAN bus. The operating status data of the low-voltage battery 103, such as discharge voltage, discharge current, and temperature data, can also be detected. Based on the operating status data, it can be determined whether the low-voltage battery 103 meets the power supply conditions. For example, when each operating status data is within a preset range, it is determined that the low-voltage battery 103 meets the power supply conditions; otherwise, it indicates that the low-voltage battery 103 does not meet the power supply conditions. It can also be determined that the low-voltage battery 103 meets the power supply conditions when there are no faults in the self-test and each operating status data is within a preset range. This double detection further improves the safety of the low-voltage battery 103 during the power supply process. When it is determined that the low-voltage battery 103 meets the power supply conditions, the first power supply control unit 104 outputs a first control signal to the first start-stop control unit 101 to control the first start-stop control unit 101 to close, so that the vehicle distribution line is conductive, so that normal power can be provided by the low-voltage battery 103.

[0052] It is understood that the first power supply control unit 104 can also be signal-connected to the heating and cooling devices of the low-voltage battery 103; the first power supply control unit 104 is used to control the opening and closing of the heating and cooling devices based on the temperature data of the low-voltage battery 103. For example, when the temperature data of the low-voltage battery 103 is greater than a first preset temperature value, the first power supply control unit 104 can control the cooling device to turn on. When the temperature data of the low-voltage battery 103 is less than a second preset temperature value, the first power supply control unit 104 can control the heating device to turn on. This prevents the impact of low temperatures on the discharge performance of the low-voltage battery 103 and damage to the low-voltage battery 103 caused by high temperatures, effectively improving the service life of the low-voltage battery 103 and ensuring the operating performance of the low-voltage battery 103. The first preset temperature value is greater than the second preset temperature value. At the same time, the first power supply control unit 104 can also adjust the discharge current of the low-voltage battery 103 based on the temperature data of the low-voltage battery 103. For example, when the temperature data of the low-voltage battery 103 is greater than the third preset temperature value, the target value of the discharge current of the low-voltage battery 103 can be determined based on the temperature data of the low-voltage battery 103, so as to adjust the discharge current of the low-voltage battery 103 according to the target value of the discharge current, thereby further improving the safety of the low-voltage battery 103 during power supply.

[0053] The second power supply control unit 106 is hard-wired to the output end of the vehicle power distribution circuit. When the vehicle power distribution circuit is on, power is supplied to the second power supply control unit 106 via the vehicle power distribution circuit, causing the second power supply control unit 106 to enter an operating mode and output a second control signal to the first start-stop control unit 101. The second power supply control unit 106 can continuously output the second control signal to the first start-stop control unit 101 while in the operating mode. The second power supply control unit 106 can also monitor fault information of the first power supply control unit 104 in real time via the CAN bus. When a fault occurs in the control board of the first power supply control unit 104, the second power supply control unit 106 outputs the second control signal to the first start-stop control unit 101. This ensures that the first start-stop control unit 101 remains closed even when a fault occurs in the control board of the first power supply control unit 104, allowing the low-voltage battery 103 to normally power the electric vehicle. This avoids safety accidents caused by a sudden power loss in the electric vehicle when a fault occurs in the control board of the first power supply control unit 104, thereby ensuring driving safety. Furthermore, the second power supply control unit 106 can also provide a fault warning when a fault occurs in the control board and / or voltage conversion component within the first power supply control unit 104, allowing the operator to stop the vehicle and troubleshoot the fault promptly, further improving driving safety. The second power supply control unit 106 can be connected to the output of the vehicle's power distribution circuit via a fuse to prevent damage to the second power supply control unit 106 from short-circuit faults.

[0054] After entering the working mode, the second power supply control unit 106 also monitors the output signal of the ON position output terminal of the ignition switch 105 in real time. When it determines that the electric vehicle is powered off based on the signal of the ON position output terminal, it stops outputting the second control signal to the first start-stop control unit 101. Therefore, after the first power supply control unit 104 stops outputting the first control signal to the first start-stop control unit 101, the low-voltage battery 103 can stop providing regular power in a timely manner. When the electric vehicle is parked for a long time, the second start-stop control unit 102 can be manually controlled to disconnect to avoid the inability to start the electric vehicle due to undervoltage in the low-voltage battery 103 when the electric vehicle is parked for a long time.

[0055] In actual application, the first start-stop control unit 101 can adopt a relay switch, and the first control signal output by the first power supply control unit 104 and the second control signal output by the second power supply control unit 106 can both be electrical signals, and the coil of the first start-stop control unit 101 is powered by the electrical signal. When at least one of the first control signal and the second control signal is output to the first start-stop control unit 101, the coil is energized and the first start-stop control unit 101 is closed. When both the first control signal and the second control signal stop being output to the first start-stop control unit 101, the coil is de-energized and the first start-stop control unit 101 is disconnected, thereby controlling the closing and disconnection of the first start-stop control unit 101 by the first power supply control unit 104 and the second power supply control unit 106.

[0056] It can be seen that in this embodiment, the low-voltage battery 103 and the first power supply control unit 104 are integrated into the same box. When the low-voltage battery 103 supplies power to the first power supply control unit 104, the first power supply control unit 104 outputs a first control signal to the first start-stop control unit 101 to control the first start-stop control unit 101 to close, thereby controlling the conduction of the vehicle power distribution circuit, so that the low-voltage battery 103 can be powered by the first power supply control unit 104, reducing the use of the control board in the low-voltage battery 103 and greatly reducing the cost of the electric vehicle; at the same time, the second power supply control unit 106 is in the vehicle power distribution circuit. When turned on, a second control signal is output to the first start-stop control unit 101 to control the first start-stop control unit 101 to maintain a closed state. The second power supply control unit 106 also detects the output signal of the ON gear output end of the ignition switch 105, and determines to stop outputting the second control signal to the first start-stop control unit 101 when the electric vehicle is powered off according to the output signal of the ON gear output end. Through the dual control of the power supply of the low-voltage battery 103 by the first power supply control unit 104 and the second power supply control unit 106, the low-voltage battery 103 can still be powered normally when the control board in the first power supply control unit 104 fails, thereby ensuring the safety of driving.

[0057] In an exemplary embodiment, the first power supply control unit 104 is further connected to the output end of the vehicle power distribution circuit and the power battery of the electric vehicle;

[0058] The first power supply control unit 104 is used to obtain the output signal of the output end of the vehicle power distribution circuit, and when it is determined based on the output signal that the low-voltage battery 103 has failed, send a first request signal to the power battery, and the first request signal is used to control the power battery to output a first voltage signal to the first power supply control unit 104; the first power supply control unit 104 is also used to convert the first voltage signal into a power supply voltage and output it through the output end of the vehicle power distribution circuit.

[0059] In this embodiment, the first power supply control unit 104 is connected to the output end of the vehicle power distribution circuit and the power battery of the electric vehicle through a power line, that is, the positive output port of the first power supply control unit 104 is connected to the positive pole of the output end of the vehicle power distribution circuit, and the negative output port of the first power supply control unit 104 is connected to the negative pole of the output end of the vehicle power distribution circuit.

[0060] During the process of power supply by the low-voltage battery 103, the first power supply control unit 104 can monitor the output signal of the output end of the vehicle distribution circuit in real time, such as the voltage signal, and determine whether the low-voltage battery 103 has a fault based on the output signal of the output end of the vehicle distribution circuit. When the low-voltage battery 103 fails, it cannot supply power normally. For example, when the working voltage of the low-voltage battery 103 becomes 0, it indicates that the low-voltage battery 103 has a circuit breaker fault.

[0061] When it is determined that the low-voltage battery 103 has failed, the first power supply control unit 104 can send a first request signal to the power battery through the CAN bus to control the power battery to output a first voltage signal to the first power supply control unit 104. The first power supply control unit 104 converts the first voltage signal (for example, 600 volts) into a low-voltage power supply voltage (for example, 24 volts) and outputs the power supply voltage through the output end of the vehicle distribution line to provide normal power for the electric vehicle. In this way, during the driving process of the electric vehicle, the sudden power loss of the electric vehicle caused by the failure of the low-voltage battery 103 can be effectively avoided, thereby ensuring the safety of driving.

[0062] In an exemplary embodiment, the first power supply control unit 104 is further connected to the second power supply control unit 106 and is configured to stop outputting the first control signal to the first start-stop control unit 101 and send a fault signal to the second power supply control unit 106 when determining that a fault occurs in the low-voltage battery 103 ;

[0063] The second power supply control unit 106 is further configured to stop outputting the second control signal to the first start-stop control unit 101 upon receiving the fault signal.

[0064] In this embodiment, the first power supply control unit 104 and the second power supply control unit 106 can be connected via a CAN bus signal. When a fault is detected in the low-voltage battery 103, the first power supply control unit 104 and the second power supply control unit 106 simultaneously stop outputting control signals to the first start-stop control unit 101 to control the first start-stop control unit 101 to disconnect, thereby effectively reducing safety hazards and avoiding damage to electrical equipment and power supply lines caused by the failure of the low-voltage battery 103.

[0065] At the same time, the second power supply control unit 106 can also provide fault reminders, making it easier for operators to stop the vehicle and troubleshoot in time, further improving driving safety.

[0066] In an exemplary embodiment, the first power supply control unit 104 is further configured to obtain operating status data of the low-voltage battery 103, and when determining based on the operating status data that the low-voltage battery 103 meets a charging condition, send a second request signal to the power battery, wherein the second request signal is configured to control the power battery to output a second voltage signal to the first power supply control unit 104;

[0067] The first power supply control unit 104 is further configured to convert the second voltage signal into a charging voltage, and the charging voltage is used to charge the low-voltage battery 103 .

[0068] In this embodiment, the operating status data of the low-voltage battery 103 may include: one or more of discharge voltage, discharge current, and temperature data; wherein the discharge voltage is the output voltage of the low-voltage battery 103, the discharge current is the output current of the low-voltage battery 103, and the temperature data is the temperature of the low-voltage battery 103 itself. The discharge voltage, discharge current, and temperature data can be collected by a voltage acquisition device, a current acquisition device, and a temperature acquisition device, respectively; wherein the voltage acquisition device, the current acquisition device, and the temperature acquisition device can respectively use a voltage sensor, a current sensor, and a temperature sensor, and the first power supply control unit 104 can be connected to the voltage acquisition device, the current acquisition device, and the temperature acquisition device via a voltage acquisition harness, a current acquisition harness, and a temperature acquisition harness, respectively. In addition, the discharge voltage, discharge current, and temperature data can also be obtained by other control devices.

[0069] When the low-voltage battery 103 is in good condition, the first power supply control unit 104 can monitor in real time whether the low-voltage battery 103 meets the charging conditions. When the charging conditions are met, the first power supply control unit 104 can request the power battery to output a second voltage signal through a bus instruction, and convert the second voltage signal into the charging voltage of the low-voltage battery 103 and charge the low-voltage battery 103.

[0070] The specific method by which the first power supply control unit 104 determines whether the low-voltage battery 103 meets the charging condition based on the operating status data can be determined based on actual needs. For example, the remaining capacity and / or discharge current of the low-voltage battery 103 can be determined based on the operating status data, and whether the low-voltage battery 103 meets the charging condition is determined based on the remaining capacity and / or discharge current. For example, the charging condition can be determined to be met when the remaining capacity is less than or equal to a first preset capacity value; when the discharge current is greater than a preset current value; or when the remaining capacity is greater than the first preset capacity value and less than a second preset capacity value, and when the discharge current is greater than a preset current value, where the second preset capacity value is greater than the first preset capacity value. The remaining capacity can be determined as the product of the discharge voltage and the discharge current, or the discharge voltage and discharge current can be corrected based on temperature data, and the product of the corrected discharge voltage and the corrected discharge current can be used as the remaining capacity to further improve the reliability of charging control.

[0071] During the process of charging the low-voltage battery 103, it can be further determined whether the low-voltage battery 103 meets the charging stop condition based on the remaining power of the low-voltage battery 103. When the charging stop condition is not met, the low-voltage battery 103 continues to be charged. When the charging stop condition is met, the first power supply control unit 104 can send a third request signal to the power battery to control the power battery to stop outputting the second voltage signal to the first power supply control unit 104 to stop charging the low-voltage battery 103.

[0072] After power is turned on, the DCDC converter of a traditional electric vehicle continues to work to charge the low-voltage battery 103, which cannot guarantee the life of the DCDC converter. Moreover, the DCDC converter operates inefficiently for a long time, resulting in energy consumption and making it impossible to guarantee the range of the electric vehicle. However, this embodiment monitors in real time whether the low-voltage battery 103 meets the charging conditions and charging stop conditions based on the working status data of the low-voltage battery 103, and controls the charging and stopping of the low-voltage battery 103 according to the monitoring results. That is, the charging is turned on and off in real time according to the remaining power and / or discharge current of the low-voltage battery 103, thereby ensuring the service life of the first power supply control unit 104 and effectively preventing the first power supply control unit 104 from continuously operating inefficiently, thereby reducing energy consumption and improving the range of the electric vehicle.

[0073] At the same time, the DCDC converter of existing electric vehicles is usually integrated into an all-in-one unit, and the DCDC converter and low-voltage battery 103 are independently controlled by separate control boards. On the one hand, there is a large delay in signal transmission and reception, and in the event of a bus failure, signal transmission and reception cannot be performed normally, thereby failing to ensure the reliability of charging the low-voltage battery 103. On the other hand, it greatly increases the cost of the electric vehicle. In contrast, the embodiment of the present invention integrates the first power supply control unit 104 and the low-voltage battery 103 into the same housing, and synchronizes the power supply process and charging process of the low-voltage battery 103 through the first power supply control unit 104. On the one hand, there is no need to transmit and receive signals between the low-voltage battery 103 and the first power supply control unit 104, so there is no signal transmission and reception delay, and there is no impact of bus failure on signal transmission and reception, thus ensuring the reliability of charging the low-voltage battery 103. On the other hand, it can effectively reduce the number of control boards used, thereby effectively reducing the cost of the electric vehicle.

[0074] In an exemplary embodiment, a first anti-reverse module is provided between the first power supply control unit 104 and the first start-stop control unit 101 , and a second anti-reverse module is provided between the second power supply control unit 106 and the first start-stop control unit 101 .

[0075] In this embodiment, the first anti-reverse module and the second anti-reverse module can be diodes. For example, the first anti-reverse module can adopt a first diode, and the second anti-reverse module can adopt a second diode. The positive pole of the first diode is connected to the first power supply control unit 104, and the negative pole of the first diode is connected to the first start-stop control unit 101. The positive pole of the second diode is connected to the second power supply control unit 106, and the negative pole of the second diode is connected to the first start-stop control unit 101, thereby effectively preventing the damage to the first power supply control unit 104 and the second power supply control unit 106 caused by signal reverse flow, and improving the reliability of power supply control.

[0076] In an exemplary embodiment, as Figure 2 As shown, it also includes a third start-stop control unit 201 and a fourth start-stop control unit 202;

[0077] The first end of the third start-stop control unit 201 and the first end of the fourth start-stop control unit 202 are both connected to the output end of the vehicle power distribution circuit; the second end of the third start-stop control unit 201 and the second end of the fourth start-stop control unit 202 are respectively connected to the first power device 203 and the second power device 204; the third end of the third start-stop control unit 201 and the third end of the fourth start-stop control unit 202 are both connected to the ON gear output end of the ignition switch 105;

[0078] When the ignition switch 105 is turned to the ON position, it is used to control the closure of the third start-stop control unit 201 and the fourth start-stop control unit 202; the third start-stop control unit 201 is used to control the on-off of the first power supply line between the output end of the vehicle power distribution line and the first electrical equipment 203; the fourth start-stop control unit 202 is used to control the on-off of the second power supply line between the output end of the vehicle power distribution line and the second electrical equipment 204; wherein, the first electrical equipment 203 is a driving-related control device, and the second electrical equipment 204 is a non-driving-related control device.

[0079] In this embodiment, the output end of the vehicle power distribution circuit is connected to a first power consumer 203 via a third start-stop control unit 201. Simultaneously, the output end of the vehicle power distribution circuit is connected to a second power consumer 204 via a fourth start-stop control unit 202. The third start-stop control unit 201 controls the on / off switching of a first power supply line between the output end of the vehicle power distribution circuit and the first power consumer 203, while the fourth start-stop control unit 202 controls the on / off switching of a second power supply line between the output end of the vehicle power distribution circuit and the second power consumer 204. Specifically, when the first power supply line is on, the low-voltage battery 103 supplies power to the first power consumer 203, and when the second power supply line is on, the low-voltage battery 103 supplies power to the second power consumer 204. The first power consumer 203 may be a driving-related control device, such as a steering control device or a brake control device. The second power consumer 204 may be a non-driving-related control device, i.e., a control device not related to driving. When a fault occurs in the second power supply line, the impact on the power supply of driving-related control devices can be effectively avoided, thereby further improving driving safety.

[0080] The ignition switch 105 is signal-connected to the third start-stop control unit 201 and the fourth start-stop control unit 202. When the vehicle power distribution circuit is on, the output end of the vehicle power distribution circuit outputs constant power to the ignition switch 105. Consequently, when the ignition switch 105 is turned to the ON position, the ignition switch 105 controls the third start-stop control unit 201 and the fourth start-stop control unit 202 to close, thereby connecting both the first and second power supply circuits. The low-voltage battery 103 outputs a first ON power to the first power-consuming device 203 via the third start-stop control unit 201, and outputs a second ON power to the second power-consuming device 204 via the fourth start-stop control unit 202. The third start-stop control unit 201 and the fourth start-stop control unit 202 can be relay switches. When the vehicle power distribution circuit is on, the ignition switch 105 controls the closing and opening of the third start-stop control unit 201 and the fourth start-stop control unit 202. The third start-stop control unit 201 and the fourth start-stop control unit 202 can be connected to the output end of the vehicle power distribution circuit through a fuse to prevent short-circuit faults from damaging the power supply circuit and electrical equipment.

[0081] In conventional electric vehicles, the ON-mode electrical devices are typically powered by the same power line. If this line fails, all electrical devices will not function properly, which can easily cause driving accidents and compromise driving safety. However, in this embodiment, a third start-stop control unit 201 and a fourth start-stop control unit 202 are provided at the output end of the vehicle's power distribution circuit. When the vehicle's power distribution circuit is on, the ignition switch 105 is turned to the ON position, controlling the third start-stop control unit 201 and the fourth start-stop control unit 202 to close, thereby powering a first electrical device 203 and a second electrical device 204, respectively, via the vehicle's power distribution circuit. The first electrical device 203 is a driving-related control device, while the second electrical device 204 is a non-driving-related control device. This allows the driving-related and non-driving-related control devices to be powered by different power lines. If the second power line fails during driving, the driving-related control devices will not be powered off. This significantly reduces the impact of power line failures on driving safety, thereby improving the driving safety of electric vehicles.

[0082] In an exemplary embodiment, the first power supply control unit 104 is further configured to obtain an electrical signal on the second power supply line, and stop outputting the first control signal to the first start-stop control unit 101 when determining based on the electrical signal that the second power supply line is disconnected.

[0083] In this embodiment, the first power supply control unit 104 can be connected to the second end signal of the fourth start-stop control unit 202 to obtain the electrical signal on the second power supply line. If there is an electrical signal output on the second power supply line, it indicates that the electric vehicle is in the power-on state, and the low-voltage battery 103 can be controlled to provide low-voltage electricity normally; if there is no electrical signal output on the second power supply line, it indicates that the electric vehicle is not powered on, and the first power supply control unit 104 can stop outputting the first control signal to the first start-stop control unit 101 to control the low-voltage battery 103 to stop providing low-voltage electricity. Among them, when the first power supply control unit 104 stops outputting the first control signal and the second power supply control unit 106 stops outputting the second control signal to the first start-stop control unit 101, the low-voltage battery 103 stops supplying power, that is, the low-voltage battery 103 enters a sleep mode, thereby effectively reducing power loss and effectively increasing the cruising range of the electric vehicle. When the low-voltage battery 103 enters sleep mode, the first power supply control unit 104 can detect the operating status data of the low-voltage battery 103 in real time, so that the low-voltage battery 103 can normally provide low-voltage power after the electric vehicle is powered on. At the same time, when the second power supply line fails and no electrical signal is output, the second power supply control unit 106 can still output a second control signal to the first start-stop control unit 101, so that the first start-stop control unit 101 remains in a closed state, avoiding driving accidents caused by the electric vehicle losing power due to a power supply line failure during driving, and further improving driving safety.

[0084] It is understandable that the first power supply control unit 104 can detect the electrical signal on the second power supply line in real time when the electric vehicle is powered on, so that the low-voltage battery 103 can normally provide low-voltage power supply after the electric vehicle is powered on. The first power supply control unit 104 can also detect the electrical signal on the second power supply line in real time when the electric vehicle is powered off. If there is no electrical signal output on the second power supply line for a preset period of time, it indicates that the electric vehicle has been powered off successfully, and the output of the first control signal to the first start-stop control unit 101 is stopped, so that the low-voltage battery 103 stops providing low-voltage power supply, thereby reducing the loss of electrical energy.

[0085] In an exemplary embodiment, as Figure 3 As shown, it also includes a fifth start-stop control unit 301; the first end of the fifth start-stop control unit 301 is connected to the output end of the vehicle power distribution circuit, and the second end of the fifth start-stop control unit 301 is connected to the third power supply device 303, and the fifth start-stop control unit 301 is used to control the on-off of the third power supply line between the output end of the vehicle power distribution circuit and the third power supply device 303;

[0086] And / or, it also includes a sixth start-stop control unit 302; the first end of the sixth start-stop control unit 302 is connected to the output end of the vehicle power distribution circuit, the second end of the sixth start-stop control unit 302 is connected to the fourth electrical equipment 304, and the third end of the sixth start-stop control unit 302 is connected to the ACC gear output end of the ignition switch 105, and is used to control the closing of the sixth start-stop control unit 302 when the ignition switch 105 is turned to the ACC gear; the sixth start-stop control unit 302 is used to control the on-off of the fourth power supply line between the output end of the vehicle power distribution circuit and the fourth electrical equipment 304.

[0087] In this embodiment, the electric vehicle low-voltage power supply device may further include a fifth start-stop control unit 301. The output end of the vehicle power distribution circuit is connected to the third power consumer 303 via the fifth start-stop control unit 301. Thus, when the vehicle power distribution circuit is conductive and the fifth start-stop control unit 301 is closed, the third power supply circuit is conductive, and power can be supplied to the third power consumer 303 via the low-voltage battery 103. The third power consumer 303 may be a power consumer that receives power from a large power source, and may include, for example, a dual-source oil pump control device, a lift control device, etc. A fuse may be provided between the fifth start-stop control unit 301 and the third power consumer 303 to prevent damage to the third power supply circuit and the third power consumer 303 due to short circuits or other causes. The fifth start-stop control unit 301 may be a mechanical switch that can be manually closed when power is needed.

[0088] The electric vehicle low-voltage power supply device may also include a sixth start-stop control unit 302. The output end of the vehicle power distribution circuit is further connected to a fourth power consumer 304 via the sixth start-stop control unit 302. When the vehicle power distribution circuit is on and the sixth start-stop control unit 302 is closed, the fourth power supply circuit is connected, enabling power to be supplied to the fourth power consumer 304 via the low-voltage battery 103. The sixth start-stop control unit 302 may be a relay switch, with the ignition switch 105 signal-connected to the sixth start-stop control unit 302. When the vehicle power distribution circuit is on, the output end of the vehicle power distribution circuit outputs a constant voltage to the ignition switch 105. When the ignition switch 105 is in the ACC position, the ignition switch 105 controls the closing of the sixth start-stop control unit 302, connecting the fourth power supply circuit and supplying power to the fourth power consumer 304 via the low-voltage battery 103. The fourth power consumer 304 may be an information display device, entertainment device, or other power consumer in the ACC position.

[0089] This embodiment supplies power to different electrical equipment through different power supply lines to meet the power needs of different electrical equipment. It is highly flexible. During driving, if a power supply line other than the first power supply line fails, it will not cause the driving-related control devices to lose power, thereby ensuring safety during driving.

[0090] The following describes the specific structure and working mode of the low-voltage power supply device for electric vehicles of the present invention through an optional embodiment. Figure 4 As shown, the low-voltage power supply device of the electric vehicle in this example includes: a low-voltage battery 103 and a first start-stop control unit 101 to form a vehicle power distribution circuit; when the first start-stop control unit 101 is closed, the output end of the vehicle power distribution circuit (i.e., the 24V positive output end and the 24V negative output end) outputs normal power through the first fuse 401.

[0091] The output end of the vehicle power distribution circuit is connected to the third start-stop control unit 201 through the second fuse 402, and is connected to the fourth start-stop control unit 202 through the third fuse 403. The output end of the vehicle power distribution circuit is also connected to the fifth start-stop control unit 301 and the sixth start-stop control unit 302. The fifth start-stop control unit 301 is connected to the third electrical equipment 303 through the fuse box 404. The fuse box 404 is provided with multiple parallel fuses, each fuse can be connected to one third electrical equipment 303; the IG1 end of the ignition switch 105 is connected to the third start-stop control unit 201 and the fourth start-stop control unit 202, the ACC end of the ignition switch 105 is connected to the sixth start-stop control unit 302, and the B1 end and B2 end of the ignition switch 105 are connected to the output end of the vehicle power distribution circuit through the fourth fuse 405. connection, used to input electric energy; when the ignition switch 105 is turned to the ACC gear, the sixth start-stop control unit 302 is controlled to be closed, and the sixth start-stop control unit 302 outputs ACC electricity to supply power to the fourth electric device 304; when the ignition switch 105 is turned to the ON gear, the third start-stop control unit 201 and the fourth start-stop control unit 202 are controlled to be closed, the third start-stop control unit 201 outputs the first ON electricity to supply power to the first electric device 203, and the fourth start-stop control unit 202 outputs the second ON electricity to supply power to the second electric device 204; when the ignition switch 105 is turned to the START gear, a start signal is output through the ST end of the ignition switch 105 to start the engine; when the fifth start-stop control unit 301 is closed, the normal electricity output through the vehicle power distribution line is used to supply power to the third electric device 303. The output end of the vehicle power distribution circuit is also connected to the second power supply control unit 106 through the fifth fuse 406 to supply power to the second power supply control unit 106 when the vehicle power distribution circuit is turned on; the second power supply control unit 106 is signal-connected to the first start-stop control unit 101 through the first diode 407, for sending a second control signal to the first start-stop control unit 101, and the second power supply control unit 106 is also signal-connected to the IG1 end of the ignition switch 105, for monitoring the ON electrical signal output by the ignition switch 105; the second power supply control unit 106 communicates with the first power supply control unit 104 through the CAN bus.

[0092] The low-voltage battery 103 is connected to the first power supply control unit 104 through the second start-stop control unit 102, so that the control board in the first power supply control unit 104 is powered by the low-voltage battery 103 when the second start-stop control unit 102 is closed. The first power supply control unit 104 is also connected to the power battery of the electric vehicle through the high-voltage input positive electrode and the high-voltage input negative electrode. When the first power supply control unit 104 recognizes that the low-voltage battery 103 meets the charging conditions, it sends a second request signal to the power battery and converts the second voltage signal output by the power battery into a 24V voltage to charge the low-voltage battery 103; the low-voltage battery 103 is provided with a voltage sensor, a current sensor 409 and a temperature sensor (the voltage sensor and the temperature sensor are arranged inside the low-voltage battery 103, Figure 4 (not shown), the first power supply control unit 104 is connected to the voltage sensor, current sensor 409 and temperature sensor through the voltage acquisition harness 410, the current acquisition harness 411 and the temperature acquisition harness 412 respectively to obtain the discharge voltage, discharge current and temperature data of the low-voltage battery 103; the first power supply control unit 104 is also connected to the output end of the vehicle power distribution line. On the one hand, the voltage conversion component in the first power supply control unit 104 is powered by the vehicle power distribution line. On the other hand, when the low-voltage battery 103 fails, the first power supply control unit 104 converts the first voltage signal output by the power battery into a 24V voltage to provide normal power for the electric vehicle; the first power supply control unit 104 is signal-connected to the first start-stop control unit 101 through the second diode 408, for sending a first control signal to the first start-stop control unit 101.

[0093] The working process of the low-voltage power supply device of electric vehicles is as follows Figure 5As shown, it includes: when the vehicle has power demand, the operator presses the second start-stop control unit 102 for three seconds to close the second start-stop control unit 102, and the control board in the first power supply control unit 104 enters the working mode; the first power supply control unit 104 controls the low-voltage battery 103 to perform self-test, and if there is a fault in the self-test, the fault light is turned on to prompt the fault, so that the operator can troubleshoot in time; if there is no fault in the self-test, the first power supply control unit 104 obtains the discharge voltage, discharge current and temperature data of the low-voltage battery 103 in real time, and sends a The first control signal is sent to the first start-stop control unit 101 to control the first start-stop control unit 101 to be closed, and the low-voltage battery 103 is used to provide normal power to the entire vehicle; when the fifth start-stop control unit 301 is closed, the third electrical device 303 is powered through the fuse box 404; at the same time, the output end of the low-voltage battery 103 distributes the normal power of the entire vehicle through the first fuse 401, and the ignition switch 105 is connected to the output end of the vehicle power distribution line through the fourth fuse 405. When the operator turns the ignition switch 105 from the LOCK gear to the ACC gear as needed, the ignition switch 105 controls the sixth start-stop control unit 301. 02 is closed, and the low-voltage battery 103 supplies power to the fourth electrical equipment 304; when the operator turns the ignition switch 105 from the LOCK gear to the ON gear as needed, the ignition switch 105 controls the third start-stop control unit 201 and the fourth start-stop control unit 202 to be closed, and the low-voltage battery 103 provides the first ON power to the first electrical equipment 203 and the second ON power to the second electrical equipment 204; at the same time, the first power supply control unit 104 detects whether there is a signal in the second ON power. If there is no signal, the low-voltage battery 103 is controlled to enter the low-power sleep mode, and the low-voltage battery 103 is powered on. The discharge voltage, discharge current and temperature data are collected in real time; if there is a signal, the second power supply control unit 106 outputs a second control signal to the first start-stop control unit 101, controlling the first start-stop control unit 101 to remain in a closed state, so as to ensure that the electric vehicle can temporarily operate when the first power supply control unit 104 fails; when the low-voltage battery 103 fails, the first power supply control unit 104 requests the power battery for high-voltage input through a bus instruction, and the first power supply control unit 104 converts the voltage output by the power battery into a 24V voltage to power the entire vehicle until the second ON power lasts for more than 5 seconds without a signal.

[0094] In addition, during the power supply process of the low-voltage battery 103, the first power supply control unit 104 monitors and calculates the remaining power of the low-voltage battery 103 and the discharge current of the low-voltage battery 103 in real time. When the remaining power of the low-voltage battery 103 is less than 30% of the rated value or the discharge current of the low-voltage battery 103 is greater than 20A, the first power supply control unit 104 requests high-voltage power distribution input through a bus instruction. The first power supply control unit 104 converts the output voltage of the power battery into a 24V voltage to charge the low-voltage battery 103. When the low-voltage battery 103 Charging stops when the remaining power is greater than 95%; when the first power supply control unit 104 detects that there is no signal from the second ON power for more than 5 seconds, and the second power supply control unit 106 detects that there is no signal output from the IG1 end of the ignition switch 105 for more than 5 seconds, the low-voltage battery 103 is controlled to enter the low-power sleep mode again; when the vehicle is parked for a long time, press and hold the second start-stop control unit 102 for five seconds to disconnect the second start-stop control unit 102, the first power supply control unit 104 turns off the first start-stop control unit 101, and the low-voltage battery 103 stops supplying power to the outside.

[0095] The following describes the low-voltage power supply method for electric vehicles provided by the present invention. The low-voltage power supply method for electric vehicles described below is based on the low-voltage power supply device for electric vehicles described above, and the two can be referenced to each other. Figure 6 As shown, the low-voltage power supply method for electric vehicles of the present invention at least includes:

[0096] S601: The first power supply control unit outputs a first control signal to the first start-stop control unit when the second start-stop control unit is closed; wherein, the first control signal is used to control the closure of the first start-stop control unit; the first start-stop control unit is arranged in the vehicle power distribution circuit of the low-voltage battery, and is used to control the on-off of the vehicle power distribution circuit; the low-voltage battery is connected to the first power supply control unit through the second start-stop control unit, and the low-voltage battery supplies power to the first power supply control unit when the second start-stop control unit is closed; the low-voltage battery and the first power supply control unit are integrated into the same box;

[0097] S602: When the vehicle power distribution circuit is turned on, the second power supply control unit outputs a second control signal to the first start-stop control unit; wherein the second power supply control unit is connected to the output end of the vehicle power distribution circuit, and the second control signal is used to control the first start-stop control unit to remain in a closed state;

[0098] S603, the second power supply control unit monitors the output signal of the ON position output terminal of the ignition switch, and stops outputting the second control signal to the first start-stop control unit when determining that the electric vehicle is powered off based on the output signal of the ON position output terminal.

[0099] In an exemplary embodiment, the present invention further comprises:

[0100] The first power supply control unit obtains an output signal from an output end of the vehicle power distribution circuit, and when determining based on the output signal that the low-voltage battery has failed, sends a first request signal to the power battery, wherein the first request signal is used to control the power battery to output a first voltage signal to the first power supply control unit;

[0101] The first power supply control unit converts the first voltage signal into a power supply voltage and outputs the voltage through the output end of the vehicle power distribution circuit.

[0102] In an exemplary embodiment, the present invention further comprises:

[0103] When the first power supply control unit determines that a fault occurs in the low-voltage battery, the first power supply control unit stops outputting the first control signal to the first start-stop control unit and sends a fault signal to the second power supply control unit;

[0104] The second power supply control unit stops outputting the second control signal to the first start-stop control unit upon receiving the fault signal.

[0105] In an exemplary embodiment, the present invention further comprises:

[0106] The first power supply control unit obtains the working status data of the low-voltage battery, and when determining based on the working status data that the low-voltage battery meets the charging condition, sends a second request signal to the power battery, wherein the second request signal is used to control the power battery to output a second voltage signal to the first power supply control unit;

[0107] The first power supply control unit converts the second voltage signal into a charging voltage, and the charging voltage is used to charge the low-voltage battery.

[0108] In an exemplary embodiment, a first anti-reverse module is provided between the first power supply control unit and the first start-stop control unit, and a second anti-reverse module is provided between the second power supply control unit and the first start-stop control unit.

[0109] In an exemplary embodiment, the present invention further comprises:

[0110] If the ignition switch is turned to the ON position, the third start-stop control unit and the fourth start-stop control unit are controlled to be closed; wherein, the third start-stop control unit is used to control the on-off of the first power supply line between the output end of the vehicle power distribution line and the first electrical equipment, and the fourth start-stop control unit is used to control the on-off of the second power supply line between the output end of the vehicle power distribution line and the second electrical equipment; the first electrical equipment is a driving-related control device, and the second electrical equipment is a non-driving-related control device.

[0111] In an exemplary embodiment, the present invention further comprises:

[0112] The first power supply control unit obtains an electrical signal on the second power supply line, and stops outputting the first control signal to the first start-stop control unit when determining based on the electrical signal that the second power supply line is disconnected.

[0113] In an exemplary embodiment, the present invention further comprises:

[0114] If the fifth start-stop control unit is closed, the third power supply line between the output end of the vehicle power distribution line and the third electrical equipment is controlled to be conductive;

[0115] And / or, if the ignition switch is turned to the ACC position, the sixth start-stop control unit is controlled to close; the sixth start-stop control unit is used to control the on-off of the fourth power supply line between the output end of the vehicle power distribution line and the fourth electrical equipment.

[0116] The present invention also provides an electric vehicle, comprising the electric vehicle low-voltage power supply device as described in any of the above embodiments.

[0117] In this embodiment, the electric vehicle may be a passenger car or a commercial vehicle, and the commercial vehicle may be an electric working machine, such as a crane, an excavator, and the like.

[0118] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0119] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A low-voltage power supply device for an electric vehicle, characterized in that: include: A first start-stop control unit, a second start-stop control unit, an ignition switch, a low-voltage battery, a first power supply control unit, and a second power supply control unit; the low-voltage battery and the first power supply control unit are integrated into the same box; The first start-stop control unit is arranged in the vehicle power distribution circuit of the low-voltage battery, and is used to control the on-off of the vehicle power distribution circuit; The low-voltage battery is connected to the first power supply control unit through the second start-stop control unit, and the low-voltage battery supplies power to the first power supply control unit when the second start-stop control unit is closed; The first power supply control unit is connected to the first start-stop control unit and is configured to output a first control signal to the first start-stop control unit when the second start-stop control unit is closed; The first control signal is used to control the first start-stop control unit to close; The ignition switch is connected to the output end of the vehicle power distribution circuit, and is used to control the power supply of the electric vehicle when the ignition switch is turned to the ON position; The second power supply control unit is connected to the output end of the vehicle power distribution circuit, and is also connected to the first start-stop control unit and the ON gear output end of the ignition switch, and is used to output a second control signal to the first start-stop control unit when the vehicle power distribution circuit is turned on, and is also used to monitor the output signal of the ON gear output end, and stop outputting the second control signal to the first start-stop control unit when it is determined that the electric vehicle is powered off based on the output signal of the ON gear output end; wherein the second control signal is used to control the first start-stop control unit to remain in a closed state; The first power supply control unit is also connected to the output end of the vehicle power distribution circuit and the power battery of the electric vehicle; The first power supply control unit is used to obtain the output signal of the output end of the vehicle power distribution circuit, and based on the output signal, determine that when the low-voltage battery fails, send a first request signal to the power battery, and the first request signal is used to control the power battery to output a first voltage signal to the first power supply control unit; the first power supply control unit is also connected to the second power supply control unit, and is used to determine that when the low-voltage battery fails, stop outputting the first control signal to the first start-stop control unit, and send a fault signal to the second power supply control unit.

2. The low-voltage power supply device for electric vehicles according to claim 1, characterized in that: The first power supply control unit is further configured to convert the first voltage signal into a power supply voltage, and output the voltage through an output end of the vehicle power distribution circuit.

3. The low-voltage power supply device for electric vehicles according to claim 2, characterized in that: The second power supply control unit is further configured to stop outputting the second control signal to the first start-stop control unit upon receiving the fault signal.

4. The low-voltage power supply device for electric vehicles according to claim 2, characterized in that: The first power supply control unit is further configured to obtain operating status data of the low-voltage battery, and when determining based on the operating status data that the low-voltage battery meets a charging condition, send a second request signal to the power battery, wherein the second request signal is configured to control the power battery to output a second voltage signal to the first power supply control unit; The first power supply control unit is further configured to convert the second voltage signal into a charging voltage, and the charging voltage is used to charge the low-voltage battery.

5. The low-voltage power supply device for electric vehicles according to claim 1, characterized in that: A first anti-reverse module is provided between the first power supply control unit and the first start-stop control unit, and a second anti-reverse module is provided between the second power supply control unit and the first start-stop control unit.

6. The low-voltage power supply device for electric vehicles according to any one of claims 1 to 5, characterized in that: Also included is a third start-stop control unit and a fourth start-stop control unit; The first end of the third start-stop control unit and the first end of the fourth start-stop control unit are both connected to the output end of the vehicle power distribution circuit; the second end of the third start-stop control unit and the second end of the fourth start-stop control unit are respectively connected to the first power consumer and the second power consumer; the third end of the third start-stop control unit and the third end of the fourth start-stop control unit are both connected to the ON gear output end of the ignition switch; When the ignition switch is turned to the ON position, it is used to control the third start-stop control unit and the fourth start-stop control unit to close; The third start-stop control unit is used to control the on-off of the first power supply line between the output end of the vehicle power distribution circuit and the first electrical equipment; the fourth start-stop control unit is used to control the on-off of the second power supply line between the output end of the vehicle power distribution circuit and the second electrical equipment; wherein, the first electrical equipment is a driving-related control device, and the second electrical equipment is a non-driving-related control device.

7. The low-voltage power supply device for electric vehicles according to claim 6, characterized in that: The first power supply control unit is further configured to obtain an electrical signal on the second power supply line, and when it is determined based on the electrical signal that the second power supply line is disconnected, stop outputting the first control signal to the first start-stop control unit.

8. The low-voltage power supply device for electric vehicles according to claim 1, characterized in that: It also includes a fifth start-stop control unit; a first end of the fifth start-stop control unit is connected to the output end of the vehicle power distribution circuit, a second end of the fifth start-stop control unit is connected to a third electrical device, and the fifth start-stop control unit is used to control the on-off of the third power supply line between the output end of the vehicle power distribution circuit and the third electrical device; And / or, it also includes a sixth start-stop control unit; the first end of the sixth start-stop control unit is connected to the output end of the vehicle power distribution circuit, the second end of the sixth start-stop control unit is connected to the fourth electrical equipment, and the third end of the sixth start-stop control unit is connected to the ACC gear output end of the ignition switch, and is used to control the closing of the sixth start-stop control unit when the ignition switch is turned to the ACC gear; the sixth start-stop control unit is used to control the on-off of the fourth power supply line between the output end of the vehicle power distribution circuit and the fourth electrical equipment.

9. A low-voltage power supply method for electric vehicles, characterized in that: The method specifically adopts the low-voltage power supply device for electric vehicles according to any one of claims 1 to 8; the method comprises: The first power supply control unit outputs a first control signal to the first start-stop control unit when the second start-stop control unit is closed; wherein, the first control signal is used to control the closure of the first start-stop control unit; the first start-stop control unit is arranged in the vehicle power distribution circuit of the low-voltage battery, and is used to control the on-off of the vehicle power distribution circuit; the low-voltage battery is connected to the first power supply control unit through the second start-stop control unit, and when the second start-stop control unit is closed, the low-voltage battery supplies power to the first power supply control unit; the low-voltage battery and the first power supply control unit are integrated into the same box; The second power supply control unit outputs a second control signal to the first start-stop control unit when the vehicle power distribution circuit is turned on; wherein the second power supply control unit is connected to the output end of the vehicle power distribution circuit, and the second control signal is used to control the first start-stop control unit to remain in a closed state; The second power supply control unit monitors the output signal of the ON gear output terminal of the ignition switch, and stops outputting the second control signal to the first start-stop control unit when determining that the electric vehicle is powered off based on the output signal of the ON gear output terminal.

10. An electric vehicle, characterized in that: include: A low-voltage power supply device for an electric vehicle as claimed in any one of claims 1 to 8.

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