CN116141966A

CN116141966A - Low-voltage power supply device and method for electric vehicle and electric vehicle

Info

Publication number: CN116141966A
Application number: CN202310188958.7A
Authority: CN
Inventors: 王锐; 田飞云; 陈刚
Original assignee: Sany Electric Vehicle Technology Co Ltd
Current assignee: Sany Electric Vehicle Technology Co Ltd
Priority date: 2023-02-27
Filing date: 2023-02-27
Publication date: 2023-05-23

Abstract

The invention relates to the field of electric vehicles, and provides a low-voltage power supply device and method for an electric vehicle and the electric vehicle, wherein the device comprises the following components: the device comprises a first start-stop control unit, a second start-stop control unit, an ignition switch, a low-voltage storage battery, a first power supply control unit and a second power supply control unit; the low-voltage storage battery and the first power supply control unit are integrated in the same box body; the first start-stop control unit is arranged in a whole vehicle distribution circuit of the low-voltage storage battery, and the low-voltage storage battery is connected with the first power supply control unit through the second start-stop control unit; the first power supply control unit is used for outputting 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 for outputting a second control signal to the first start-stop control unit when the whole vehicle distribution line is conducted, and is also used for determining that the second control signal is stopped being output when the electric vehicle is powered down. The invention can effectively ensure the driving safety and reduce the cost of the electric vehicle.

Description

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

Technical Field

The present invention relates to the 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

Electric vehicles are rapidly developed due to the advantages of environmental protection, energy saving, low noise and the like. The power source of the electric vehicle is generally composed of a power battery and a low-voltage storage battery, the low-voltage storage battery is used for supplying power to a low-voltage system of the electric vehicle and providing communication signals, the power battery is used for providing the power source for the electric vehicle, and meanwhile, the power battery is used for charging the low-voltage storage battery through a DCDC (Direct Current Direct Current, direct current) converter.

The existing electric vehicle generally performs power supply control on the low-voltage storage battery through a control circuit inside the low-voltage storage battery, however, when the control circuit inside the low-voltage storage battery fails, the low-voltage storage battery cannot normally supply power to the electric vehicle, so that driving accidents are extremely easy to occur in the driving process, and the driving safety cannot be guaranteed. Meanwhile, the DCDC converter of the existing electric vehicle is generally integrated in a multi-in-one structure, and the DCDC converter and the low-voltage storage battery are respectively and independently controlled through separate control boards, so that the cost of the electric vehicle is greatly increased.

Disclosure of Invention

The invention provides a low-voltage power supply device and method for an electric vehicle and the electric vehicle, which are used for solving the defects that the electric vehicle is high in cost and cannot guarantee the driving safety in the prior art, and realizing the effective reduction of the cost of the electric vehicle and the effective improvement of the driving safety.

The invention provides a low-voltage power supply device of an electric vehicle, comprising: the device comprises a first start-stop control unit, a second start-stop control unit, an ignition switch, a low-voltage storage battery, a first power supply control unit and a second power supply control unit; the low-voltage storage battery and the first power supply control unit are integrated in the same box body;

the first start-stop control unit is arranged in the whole vehicle distribution line of the low-voltage storage battery and used for controlling the on-off of the whole vehicle distribution line;

the low-voltage storage battery is connected with the first power supply control unit through the second start-stop control unit, and the low-voltage storage battery supplies power for the first power supply control unit when the second start-stop control unit is closed;

the first power supply control unit is connected with the first start-stop control unit and is used for outputting 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 for controlling the first start-stop control unit to be closed;

the ignition switch is connected with the output end of the whole vehicle distribution circuit and is used for controlling the electric vehicle to be electrified when the ignition switch is turned ON;

the second power supply control unit is connected with the output end of the whole-vehicle distribution line, is also connected with the first start-stop control unit and the ON gear output end of the ignition switch, and is used for outputting a second control signal to the first start-stop control unit when the whole-vehicle distribution line is conducted, monitoring the output signal of the ON gear output end, and stopping outputting the second control signal to the first start-stop control unit when the electric vehicle is powered down according to the output signal of the ON gear output end; the second control signal is used for controlling the first start-stop control unit to keep a closed state.

According to the low-voltage power supply device for the electric vehicle, the first power supply control unit is also connected with the output end of the whole vehicle distribution circuit and the power battery of the electric vehicle;

the first power supply control unit is used for acquiring an output signal of an output end of the whole vehicle distribution line, and sending a first request signal to the power battery when the low-voltage storage battery is determined to be in fault based on the output signal, wherein the first request signal is used for controlling 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 for converting the first voltage signal into power supply voltage and outputting the power supply voltage through the output end of the whole vehicle distribution circuit.

According to the low-voltage power supply device for the electric vehicle, the first power supply control unit is further connected with the second power supply control unit and is used for determining that the first control signal is stopped being output to the first start-stop control unit when the low-voltage storage battery fails and sending a failure signal to the second power supply control unit;

the second power supply control unit is further used for stopping outputting the second control signal to the first start-stop control unit when the fault signal is received.

According to the low-voltage power supply device for the electric vehicle, the first power supply control unit is further used for acquiring the working state data of the low-voltage storage battery, and sending a second request signal to the power battery when the low-voltage storage battery is determined to meet the charging condition based on the working state data, wherein the second request signal is used for controlling 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, where the charging voltage is used to charge the low-voltage battery.

According to the low-voltage power supply device for the electric vehicle, the first reverse-preventing module is arranged between the first power supply control unit and the first start-stop control unit, and the second reverse-preventing module is arranged between the second power supply control unit and the first start-stop control unit.

The low-voltage power supply device for the electric vehicle, provided by the invention, further comprises 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 connected with the output end of the whole vehicle 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 with first electric equipment and second electric equipment; the third end of the third start-stop control unit and the third end of the fourth start-stop control unit are connected with the ON gear output end of the ignition switch;

When the ignition switch is turned ON to an ON gear, the third start-stop control unit and the fourth start-stop control unit are controlled to be closed; the third start-stop control unit is used for controlling the on-off of a first power supply circuit between the output end of the whole-vehicle distribution circuit and the first electric equipment; the fourth start-stop control unit is used for controlling the on-off of a second power supply circuit between the output end of the whole-vehicle power distribution circuit and the second electric equipment; the first electric equipment is a driving-related control device, and the second electric equipment is a non-driving-related control device.

According to the low-voltage power supply device for the electric vehicle, the first power supply control unit is further used for acquiring the electric signal on the second power supply line, and stopping outputting the first control signal to the first start-stop control unit when the fact that the second power supply line is disconnected is determined based on the electric signal.

The low-voltage power supply device for the electric vehicle, provided by the invention, further comprises a fifth start-stop control unit; the first end of the fifth start-stop control unit is connected with the output end of the whole electric vehicle distribution line, the second end of the fifth start-stop control unit is connected with third electric equipment, and the fifth start-stop control unit is used for controlling the on-off of a third power supply line between the output end of the whole electric vehicle distribution line and the third electric equipment;

And/or, further comprising a sixth start-stop control unit; the first end of the sixth start-stop control unit is connected with the output end of the whole-vehicle distribution line, the second end of the sixth start-stop control unit is connected with fourth electric equipment, the third end of the sixth start-stop control unit is connected with the ACC gear output end of the ignition switch, and the ignition switch is used for controlling the sixth start-stop control unit to be closed when the ignition switch is switched to an ACC gear; and the sixth start-stop control unit is used for controlling the on-off of a fourth power supply circuit between the output end of the whole-vehicle power distribution circuit and the fourth electric equipment.

The invention also provides a low-voltage power supply method of the electric vehicle, which comprises the following steps:

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; the first control signal is used for controlling the first start-stop control unit to be closed; the first start-stop control unit is arranged in the whole vehicle distribution line of the low-voltage storage battery and used for controlling the on-off of the whole vehicle distribution line; the low-voltage storage battery is connected with the first power supply control unit through the second start-stop control unit, and the low-voltage storage battery supplies power for the first power supply control unit when the second start-stop control unit is closed; the low-voltage storage battery and the first power supply control unit are integrated in the same box body;

The second power supply control unit outputs a second control signal to the first start-stop control unit when the whole vehicle distribution line is conducted; the second power supply control unit is connected with the output end of the whole vehicle distribution line, and the second control signal is used for controlling the first start-stop control unit to keep a closed state;

the second power supply control unit monitors an output signal of an ON gear output end of the ignition switch, and stops outputting the second control signal to the first start-stop control unit when the electric vehicle is powered down according to the output signal of the ON gear output end.

The invention also provides an electric vehicle, which comprises the low-voltage power supply device of the electric vehicle.

According to the low-voltage power supply device and method for the electric vehicle and the electric vehicle, the low-voltage storage battery and the first power supply control unit are integrated in the same box, when the low-voltage storage 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 so as to control the first start-stop control unit to be closed and further control the whole vehicle distribution line to be conducted, so that the low-voltage storage battery can be subjected to power supply control through the first power supply control unit, the use of a control board in the low-voltage storage battery is reduced, and the cost of the electric vehicle is greatly reduced; meanwhile, the second power supply control unit outputs a second control signal to the first start-stop control unit when the whole vehicle distribution line is conducted so as to control the first start-stop control unit to keep a closed state, the second power supply control unit also detects an output signal of an ON gear output end of the ignition switch, the second control signal is stopped to be output to the first start-stop control unit when the electric vehicle is powered down according to the output signal of the ON gear output end, the low-voltage storage battery is powered down through double control of the first power supply control unit and the second power supply control unit, normal power supply of the low-voltage storage battery can still be guaranteed when a control board in the first power supply control unit fails, and driving safety is guaranteed.

Drawings

In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a low-voltage power supply device for an electric vehicle according to an embodiment of the present invention;

FIG. 2 is a second schematic diagram of a low-voltage power supply device for an electric vehicle according to an embodiment of the present invention;

FIG. 3 is a third schematic structural diagram of a low-voltage power supply device for an electric vehicle according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a low-voltage power supply device for an electric vehicle according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a working flow of a low-voltage power supply device for an electric vehicle according to an embodiment of the present invention;

fig. 6 is a schematic flow chart of a low-voltage power supply method for an electric vehicle according to an embodiment of the present invention;

reference numerals:

101: a first start-stop control unit; 102: a second start-stop control unit; 103: a low voltage battery; 104: a first power supply control unit; 105: an ignition switch; 106: a second power supply control unit; 201: a third start-stop control unit; 202: a fourth start-stop control unit; 203: the first electric equipment; 204: the second electric equipment; 301: a fifth start-stop control unit; 302: a sixth start-stop control unit; 303: the third electric equipment; 304: fourth electric equipment; 401: a first fuse; 402: a second fuse; 403: a third fuse; 404: a fuse box; 405: a fourth fuse; 406: a fifth fuse; 407: a first diode; 408: a second diode; 409: a current sensor; 410: a voltage acquisition harness; 411: a current collection harness; 412: and (5) collecting the wire harness at the temperature.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The low voltage power supply device for an electric vehicle of the present invention is described below with reference to fig. 1 to 5. The low-voltage power supply device of the electric vehicle is used for providing low voltage power for the whole vehicle of the electric vehicle. As shown in fig. 1, the low-voltage power supply device for an electric vehicle of the present invention at least includes:

a first start-stop control unit 101, a second start-stop control unit 102, an ignition switch 105, a low-voltage storage battery 103, a first power supply control unit 104, and a second power supply control unit 106; the low-voltage storage battery 103 and the first power supply control unit 104 are integrated in the same box body;

the first start-stop control unit 101 is arranged in a whole vehicle distribution line of the low-voltage storage battery 103 and is used for controlling the on-off of the whole vehicle distribution line;

The low-voltage storage battery 103 is connected with the first power supply control unit 104 through the second start-stop control unit 102, and the low-voltage storage battery 103 supplies power to the first power supply control unit 104 when the second start-stop control unit 102 is closed;

the first power supply control unit 104 is connected with 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 for controlling the first start-stop control unit 101 to be closed;

the ignition switch 105 is connected with the output end of the whole vehicle distribution line, and the ignition switch 105 is used for controlling the electric vehicle to be electrified when the ignition switch 105 is switched to an ON gear;

the second power supply control unit 106 is connected with the output end of the whole vehicle distribution line, is also connected with the first start-stop control unit 101 and the ON-gear output end of the ignition switch 105, and is configured to output a second control signal to the first start-stop control unit 101 when the whole vehicle distribution line is turned ON, and is also configured 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 down according to the output signal of the ON-gear output end; wherein the second control signal is used for controlling the first start-stop control unit 101 to keep a closed state.

In this embodiment, the low-voltage battery 103 is used to provide low-voltage power for the whole electric vehicle, for example, a 24V low-voltage lithium battery. The first power supply control unit 104 and the second power supply control unit 106 are configured to control a power supply process of the low-voltage battery 103, and at the same time, the first power supply control unit 104 may also convert an output voltage of a power battery of the electric vehicle into a charging voltage of the low-voltage battery 103, so as to charge the low-voltage battery 103. The second power supply control unit 106 may be a controller of the electric vehicle itself, for example, a vehicle control unit, and may also be a newly added controller. The low-voltage storage battery 103 and the first power supply control unit 104 are integrated in the same box body, for example, the low-voltage storage battery 103 and the first power supply control unit 104 can be integrated in a non-standard box, the non-standard box can be singly numbered and assembled at the position closest to the frame, so that the low-voltage line is minimized, the low-voltage storage battery 103 can be power-supplied and controlled by a control board of the first power supply control unit 104, and the cost of the electric vehicle is effectively reduced. Meanwhile, in the embodiment, the low-voltage storage battery 103 and the first power supply control unit 104 are integrated in the same box body, and the connection between the low-voltage storage battery 103 and the first power supply control unit 104 can be realized through the copper bars, so that a 25 square power line is omitted, and the cost and the weight of the electric vehicle are further reduced.

The first start-stop control unit 101 is arranged in a whole vehicle distribution line of the low-voltage storage battery 103 and used for controlling the on-off of the whole vehicle distribution line, the whole vehicle distribution line can comprise the low-voltage storage battery 103 and the first start-stop control unit 101, when the first start-stop control unit 101 is closed, the whole vehicle distribution line is on, the output end of the whole vehicle distribution line outputs normal electricity, when the first start-stop control unit 101 is disconnected, the whole vehicle distribution line is disconnected, and the whole vehicle distribution line stops outputting normal electricity.

The low-voltage storage battery 103 is connected with the first power supply control unit 104 through the second start-stop control unit 102, and the low-voltage storage battery 103 is controlled by the second start-stop control unit 102 to supply power to the first power supply control unit 104 or stop supplying power. In practical application, the second start-stop control unit 102, the first power supply control unit 104 and the low-voltage storage battery 103 are connected in series to form a power supply loop, when the second start-stop control unit 102 is closed, the power supply loop is conducted, the first power supply control unit 104 is powered through the low-voltage storage battery 103, and the first power supply control unit 104 enters a working mode; when the second start-stop control unit 102 is turned off, the low-voltage battery 103 stops supplying power to the first power supply control unit 104, the first power supply control unit 104 stops operating, and at the same time, 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 may be a manual control switch, for example, a self-reset switch, which is closed for 3 seconds and opened for 5 seconds.

The ignition switch 105 is connected with the output end of the whole vehicle distribution line, when the whole vehicle distribution line is conducted, normal electricity is input to the ignition switch 105, and if the ignition switch 105 is turned ON, the ignition switch 105 outputs an ON electric signal to control the electric vehicle to be electrified. The ignition switch 105 may be connected to an output terminal of the entire vehicle distribution line through a fuse, so as to prevent damage to the ignition switch 105 caused by a short circuit fault.

The first power supply control unit 104 is in signal connection with the first start-stop control unit 101, and when the second start-stop control unit 102 is closed, the first power supply control unit 104 enters a working mode and outputs a first control signal to the first start-stop control unit 101. Wherein the first power supply control unit 104 may determine whether the low-voltage storage battery 103 satisfies the power supply condition after entering the operation mode. For example, the low voltage battery 103 may be controlled to perform a self-test, which indicates that the power supply condition is satisfied when there is no fault; when the low-voltage storage battery 103 has a fault, a fault prompt is performed, for example, a fault lamp CAN be controlled to be lighted to remind an operator of troubleshooting, and 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 through the CAN bus. The working state data of the low-voltage storage battery 103, such as discharge voltage, discharge current and temperature data, can be detected, whether the low-voltage storage battery 103 meets the power supply condition is determined based on the working state data, for example, when each working state data is in a preset range, the low-voltage storage battery 103 is determined to meet the power supply condition, otherwise, the low-voltage storage battery 103 is indicated to not meet the power supply condition; and when the self-check is fault-free and all the working state data are in a preset range, the low-voltage storage battery 103 is determined to meet the power supply condition, so that the safety of the low-voltage storage battery 103 in the power supply process is further improved through double detection. When it is determined that the low-voltage storage battery 103 meets the power supply condition, 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 be closed, so that the whole vehicle distribution line is conducted, and normal electricity can be provided through the low-voltage storage battery 103.

It is understood that the first power supply control unit 104 may also be in signal connection with the heating means and the cooling means of the low-voltage battery 103; the first power supply control unit 104 is used for controlling the on-off of the heating device and the cooling device according to the temperature data of the low-voltage storage battery 103. For example, when the temperature data of the low-voltage storage battery 103 is greater than a first preset temperature value, the first power supply control unit 104 may control the cooling device to be turned on, and when the temperature data of the low-voltage storage battery 103 is less than a second preset temperature value, the first power supply control unit 104 may control the heating device to be turned on, so as to avoid the influence of low temperature on the discharge performance of the low-voltage storage battery 103 and the damage of high temperature on the low-voltage storage battery 103, thereby effectively improving the service life of the low-voltage storage battery 103 and ensuring the working performance of the low-voltage storage battery 103. Wherein the first preset temperature value is greater than the second preset temperature value. Meanwhile, the first power supply control unit 104 may also adjust the magnitude of 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 discharging current of the low-voltage battery 103 may be determined based on the temperature data of the low-voltage battery 103, so as to adjust the discharging current of the low-voltage battery 103 according to the target value of the discharging current, thereby further improving the safety during the power supply of the low-voltage battery 103.

The second power supply control unit 106 is connected with the output end of the whole vehicle distribution line through a hard wire, when the whole vehicle distribution line is conducted, the second power supply control unit 106 is powered through the whole vehicle distribution line, the second power supply control unit 106 enters a working mode, and a second control signal is output to the first start-stop control unit 101. The second power supply control unit 106 may continuously output the second control signal to the first start-stop control unit 101 when entering the working mode; the second power supply control unit 106 CAN also monitor the fault information of the first power supply control unit 104 in real time through the CAN bus, when the control board in the first power supply control unit 104 fails, the second power supply control unit 106 outputs a second control signal to the first start-stop control unit 101, so that the first start-stop control unit 101 CAN still be ensured to keep a closed state when the control board in the first power supply control unit 104 fails, and the electric vehicle CAN be normally powered through the low-voltage storage battery 103, so that the safety accident caused by sudden power failure of the electric vehicle when the control board in the first power supply control unit 104 fails in the driving process is avoided, and the driving safety is further ensured. Meanwhile, the second power supply control unit 106 can also perform fault prompt when the control board and/or the voltage conversion component in the first power supply control unit 104 breaks down, so that an operator can stop the vehicle in time for troubleshooting, and the driving safety is further improved. The second power supply control unit 106 may be connected to an output terminal of the entire vehicle distribution line through a fuse to prevent damage to the second power supply control unit 106 due to a short circuit fault.

After the second power supply control unit 106 enters the working mode, the output signal of the ON gear output end of the ignition switch 105 is monitored in real time, and when the electric vehicle is determined to be powered down according to the signal of the ON gear output end, the second control signal is stopped from being output to the first start-stop control unit 101, so that 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 storage battery 103 can stop providing normal electricity in time. When the electric vehicle is parked for a long time, the second start-stop control unit 102 can be controlled to be turned off manually, so that the situation that the electric vehicle cannot start due to the undervoltage of the low-voltage storage battery 103 when the electric vehicle is parked for a long time is avoided.

In practical application, the first start-stop control unit 101 may adopt a relay switch, 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 may be electric signals, the electric signals are used for supplying power to the coil of the first start-stop control unit 101, 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 powered, the first start-stop control unit 101 is closed, when the first control signal and the second control signal are stopped from being output to the first start-stop control unit 101, the coil is powered off, and the first start-stop control unit 101 is disconnected, so that the first start-stop control unit 101 is controlled to be closed and opened by the first power supply control unit 104 and the second power supply control unit 106.

Therefore, in this embodiment, by integrating the low-voltage storage battery 103 and the first power supply control unit 104 in the same box, when the low-voltage storage 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 be closed, so as to control the whole vehicle distribution line to be conducted, so that the low-voltage storage battery 103 can be power-supplied and controlled by the first power supply control unit 104, thereby reducing the use of a control board in the low-voltage storage battery 103 and greatly reducing the cost of the electric vehicle; meanwhile, the second power supply control unit 106 outputs a second control signal to the first start-stop control unit 101 when the whole vehicle distribution line is conducted so as to control the first start-stop control unit 101 to keep a closed state, the second power supply control unit 106 also detects an output signal of an ON gear output end of the ignition switch 105, and stops outputting the second control signal to the first start-stop control unit 101 when the electric vehicle is powered down according to the output signal of the ON gear output end, and the low-voltage storage battery 103 is powered up through the dual control of the first power supply control unit 104 and the second power supply control unit 106, so that the normal power supply of the low-voltage storage battery 103 can be ensured when a control board in the first power supply control unit 104 fails, and the driving safety is ensured.

In an exemplary embodiment, the first power supply control unit 104 is further connected to an output end of the entire vehicle distribution line and a power battery of the electric vehicle;

the first power supply control unit 104 is configured to obtain an output signal of an output end of the whole vehicle distribution line, and send a first request signal to the power battery when determining that the low-voltage storage battery 103 fails based on the output signal, where 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 further configured to convert the first voltage signal into a power supply voltage, and output the power supply voltage through an output end of the whole vehicle distribution line.

In this embodiment, the first power supply control unit 104 is connected to the output end of the whole vehicle distribution line 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 electrode of the output end of the whole vehicle distribution line, and the negative output port of the first power supply control unit 104 is connected to the negative electrode of the output end of the whole vehicle distribution line.

In the process of supplying power to the low-voltage storage battery 103, the first power supply control unit 104 may monitor the output signal, such as the voltage signal, of the output end of the whole vehicle distribution line in real time, and determine whether the low-voltage storage battery 103 has a fault according to the output signal of the output end of the whole vehicle distribution line, when the low-voltage storage battery 103 has a fault, power supply cannot be normally performed, for example, when the working voltage of the low-voltage storage battery 103 becomes 0, it indicates that the low-voltage storage battery 103 has a circuit breaking fault.

When it is determined that the low-voltage storage battery 103 fails, the first power supply control unit 104 may 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, where the first power supply control unit 104 converts the first voltage signal (for example, 600 v) into a low-voltage power supply voltage (for example, 24 v), and outputs the power supply voltage through an output end of the whole-vehicle distribution circuit, so as to provide normal electricity for the electric vehicle, thereby effectively avoiding sudden power-down of the electric vehicle caused by the failure of the low-voltage storage battery 103 in the driving process of the electric vehicle, and ensuring driving safety.

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 determine that the low voltage battery 103 fails, stop outputting the first control signal to the first start-stop control unit 101, and send a failure signal to the second power supply control unit 106;

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 when the fault signal is received.

In this embodiment, the first power supply control unit 104 and the second power supply control unit 106 may be connected through a CAN bus signal, and when detecting that the low-voltage storage battery 103 has a fault, the first power supply control unit 104 and the second power supply control unit 106 stop outputting control signals to the first start-stop control unit 101 at the same time, so as to control the first start-stop control unit 101 to be disconnected, thereby effectively reducing potential safety hazards, and simultaneously avoiding damage of the fault of the low-voltage storage battery 103 to electric equipment and a power supply circuit.

Meanwhile, the second power supply control unit 106 can also carry out fault reminding, so that an operator can park in time to remove the faults, and the driving safety is further improved.

In an exemplary embodiment, the first power supply control unit 104 is further configured to obtain operating state data of the low-voltage storage battery 103, and send a second request signal to the power battery when it is determined that the low-voltage storage battery 103 meets a charging condition based on the operating state data, where the second request signal is used to control the power battery to output a second voltage signal to the first power supply control unit 104;

the first power supply control unit 104 is further configured to convert the second voltage signal into a charging voltage, where the charging voltage is used to charge the low voltage battery 103.

In this embodiment, the operation state data of the low-voltage battery 103 may include: one or more of discharge voltage, discharge current, and temperature data; the discharging voltage is the output voltage of the low-voltage storage battery 103, the discharging current is the output current of the low-voltage storage battery 103, the temperature data is the self temperature of the low-voltage storage battery 103, and the discharging voltage, the discharging current and the temperature data can be acquired through a voltage acquisition device, a current acquisition device and a temperature acquisition device respectively; wherein, voltage acquisition device, current acquisition device and temperature acquisition device can adopt voltage sensor, current sensor and temperature sensor respectively, and first power supply control unit 104 can be connected with voltage acquisition device, current acquisition device and temperature acquisition device respectively through voltage acquisition pencil, current acquisition pencil and temperature acquisition pencil. In addition, the discharge voltage, discharge current and temperature data can also be obtained by other control devices.

When the low-voltage storage battery 103 has no fault, the first power supply control unit 104 can monitor whether the low-voltage storage battery 103 meets a charging condition in real time, and when the charging condition is 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 a charging voltage of the low-voltage storage battery 103 and charge the low-voltage storage battery 103.

The specific manner in which the first power supply control unit 104 determines whether the low-voltage storage battery 103 satisfies the charging condition based on the operating state data may be determined according to actual demands, for example, the remaining capacity and/or the discharge current of the low-voltage storage battery 103 may be determined based on the operating state data, and whether the low-voltage storage battery 103 satisfies the charging condition based on the remaining capacity and/or the discharge current may be determined. For example, it may be determined that the charging condition is satisfied when the remaining power is less than or equal to a first preset power value; the charging condition may also be determined to be satisfied when the discharge current is greater than a preset current value; and the charging condition can be determined to be met when the residual electric quantity is larger than a first preset electric quantity value and smaller than a second preset electric quantity value and the discharge current is larger than a preset current value, wherein the second preset electric quantity value is larger than the first preset electric quantity value. The product of the discharge voltage and the discharge current may be used as the remaining power, or the discharge voltage and the discharge current may be corrected based on the temperature data, and the product of the discharge voltage after the correction and the discharge current after the correction may be used as the remaining power, so as to further improve the reliability of the charge control.

In the process of charging the low-voltage storage battery 103, whether the low-voltage storage battery 103 meets a charging stop condition may be further determined according to the remaining power of the low-voltage storage battery 103, when the charging stop condition is not met, the low-voltage storage battery 103 is continuously charged, and when the charging stop condition is met, the first power supply control unit 104 may 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, so as to stop charging the low-voltage storage battery 103.

The DCDC converter continuously works after the traditional electric vehicle is electrified to charge the low-voltage storage battery 103, so that the service life of the DCDC converter cannot be guaranteed, and the DCDC converter runs for a long time with low efficiency, so that the consumption of electric energy is caused, and the endurance mileage of the electric vehicle cannot be guaranteed. In this embodiment, whether the low-voltage storage battery 103 meets the charging condition and the charging stop condition is monitored in real time based on the working state data of the low-voltage storage battery 103, and the low-voltage storage battery 103 is subjected to charging control and stopping charging control according to the monitoring result, that is, the charging is started and stopped in real time according to the residual capacity and/or the discharging current of the low-voltage storage battery 103, so that the service life of the first power supply control unit 104 is ensured, and the first power supply control unit 104 can be effectively prevented from continuously running in low efficiency, so that the consumption of electric energy is reduced, and the endurance of the electric vehicle is improved.

Meanwhile, the DCDC converter of the existing electric vehicle is usually integrated inside the integrated circuit, the DCDC converter and the low-voltage storage battery 103 are respectively and independently controlled through separate control boards, on one hand, the signal receiving and transmitting are greatly delayed, and the signal receiving and transmitting cannot be normally carried out under the condition of bus faults, so that the reliability of charging of the low-voltage storage battery 103 cannot be ensured, and on the other hand, the cost of the electric vehicle is greatly increased. In the embodiment of the invention, the first power supply control unit 104 and the low-voltage storage battery 103 are integrated in the same box body, and the power supply process and the charging process of the low-voltage storage battery 103 are synchronously controlled by the first power supply control unit 104, so that on one hand, the low-voltage storage battery 103 and the first power supply control unit 104 do not need to receive and send signals, and no delay exists between the receiving and sending of the signals and influence of bus faults on the receiving and sending of the signals, thereby ensuring the reliability of charging of the low-voltage storage battery 103; on the other hand, the use quantity of the control boards can be effectively reduced, and the cost of the electric vehicle is effectively reduced.

In an exemplary embodiment, a first reverse preventing module is disposed between the first power supply control unit 104 and the first start-stop control unit 101, and a second reverse preventing module is disposed between the second power supply control unit 106 and the first start-stop control unit 101.

In this embodiment, the first reverse preventing module and the second reverse preventing module may be diodes, for example, the first reverse preventing module may adopt a first diode, the second reverse preventing module may adopt a second diode, an anode of the first diode is connected with the first power supply control unit 104, a cathode of the first diode is connected with the first start-stop control unit 101, an anode of the second diode is connected with the second power supply control unit 106, and a cathode of the second diode is connected with the first start-stop control unit 101, so that damage of signal reverse strings to the first power supply control unit 104 and the second power supply control unit 106 can be effectively prevented, and reliability of power supply control is improved.

In an exemplary embodiment, as shown in fig. 2, a third start-stop control unit 201 and a fourth start-stop control unit 202 are further included;

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 with the output end of the whole vehicle distribution line; 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 with the first electric equipment 203 and the second electric equipment 204; a third end of the third start-stop control unit 201 and a third end of the fourth start-stop control unit 202 are both connected with an ON-gear output end of the ignition switch 105;

The ignition switch 105 is used for controlling the third start-stop control unit 201 and the fourth start-stop control unit 202 to be closed when being switched to an ON gear; the third start-stop control unit 201 is configured to control on-off of a first power supply line between an output end of the whole-vehicle power distribution line and the first electric device 203; the fourth start-stop control unit 202 is configured to control on-off of a second power supply line between an output end of the whole-vehicle power distribution line and the second electric equipment 204; the first electric device 203 is a driving-related control device, and the second electric device 204 is a non-driving-related control device.

In this embodiment, the output end of the whole electric distribution line is connected with the first electric equipment 203 through the third start-stop control unit 201, and meanwhile, the output end of the whole electric distribution line is connected with the second electric equipment 204 through the fourth start-stop control unit 202, so as to control the on-off of the first power supply line between the output end of the whole electric distribution line and the first electric equipment 203 through the closing and opening of the third start-stop control unit 201, and control the on-off of the second power supply line between the output end of the whole electric distribution line and the second electric equipment 204 through the closing and opening of the fourth start-stop control unit 202. That is, when the first power supply line is turned on, the first electric device 203 is powered by the low-voltage storage battery 103, and when the second power supply line is turned on, the second electric device 204 is powered by the low-voltage storage battery 103. The first powered device 203 may be a driving related control device, such as a steering control device, a braking control device, etc., and the second powered device 204 may be a non-driving related control device, i.e., a control device other than driving. When the second power supply circuit fails, the influence on the power supply of the control device related to driving can be effectively avoided, and therefore driving safety is further improved.

The ignition switch 105 is in signal connection with the third start-stop control unit 201 and the fourth start-stop control unit 202, when the whole vehicle distribution circuit is conducted, the output end of the whole vehicle distribution circuit outputs normal electricity to the ignition switch 105, so that when the ignition switch 105 is turned ON, the third start-stop control unit 201 and the fourth start-stop control unit 202 are controlled to be closed through the ignition switch 105, the first power supply circuit and the second power supply circuit are conducted, the low-voltage storage battery 103 outputs first ON electricity to the first electric equipment 203 through the third start-stop control unit 201, and outputs second ON electricity to the second electric equipment 204 through the fourth start-stop control unit 202. The third start-stop control unit 201 and the fourth start-stop control unit 202 may adopt relay switches, and when the whole vehicle distribution line is turned on, the ignition switch 105 controls the third start-stop control unit 201 and the fourth start-stop control unit 202 to be turned on and off. The third start-stop control unit 201 and the fourth start-stop control unit 202 can be connected with the output end of the whole vehicle distribution line through fuses so as to prevent the damage of the short circuit fault to the power supply line and the electric equipment.

The ON-grade electric equipment of the existing electric vehicle is usually powered through the same circuit, and when the circuit fails, all the electric equipment cannot be normally used, driving accidents are extremely easy to occur, and driving safety cannot be guaranteed. In the embodiment, the third start-stop control unit 201 and the fourth start-stop control unit 202 are arranged at the output end of the whole vehicle distribution line, when the whole vehicle distribution line is conducted, the ignition switch 105 controls the third start-stop control unit 201 and the fourth start-stop control unit 202 to be closed when the whole vehicle distribution line is turned ON, so that the first electric equipment 203 and the second electric equipment 204 are respectively powered by the whole vehicle distribution line, wherein the first electric equipment 203 is a driving related control device, the second electric equipment 204 is a non-driving related control device, and therefore the driving related control device and the non-driving related control device can be powered by different power supply lines, if the second power supply line fails in the driving process, the driving related control device is not powered down, the influence of the power supply line failure ON driving safety is greatly reduced, and the driving safety of the electric vehicle is improved.

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 that the second power supply line is disconnected based on the electrical signal.

In this embodiment, the first power supply control unit 104 may be in signal connection with the second end of the fourth start-stop control unit 202 to obtain an electrical signal on the second power supply line, and if there is an electrical signal output on the second power supply line, it indicates that the electric vehicle is in a power-on state, and the low-voltage battery 103 may be controlled to normally provide low voltage power; if no electric signal is output on the second power supply line, indicating that the electric vehicle is not powered on, the first power supply control unit 104 may stop outputting the first control signal to the first start-stop control unit 101 to control the low voltage battery 103 to stop providing the low voltage power. 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 storage battery 103 stops supplying power, that is, the low-voltage storage battery 103 enters the sleep mode, so that the electric energy loss can be effectively reduced, and the effective increase of the endurance mileage of the electric vehicle is realized. When the low-voltage battery 103 enters the sleep mode, the first power supply control unit 104 may detect the working state data of the low-voltage battery 103 in real time, so that the low-voltage battery 103 can normally perform low-voltage power supply after the electric vehicle is powered on. Meanwhile, when the second power supply line has no electric signal output due to failure, the second power supply control unit 106 can still output the second control signal to the first start-stop control unit 101, so that the first start-stop control unit 101 keeps a closed state, driving accidents caused by power failure of the power supply line of the electric vehicle in the driving process are avoided, and driving safety is further improved.

It may be appreciated that the first power supply control unit 104 may 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 perform low-voltage power supply after the electric vehicle is powered on. The first power supply control unit 104 may further detect an electrical signal on the second power supply line in real time when the electric vehicle is powered down, if no electrical signal is output on the second power supply line for a preset period of time, it indicates that the electric vehicle is powered down successfully, and stops outputting the first control signal to the first start-stop control unit 101, so that the low-voltage battery 103 stops low-voltage power supply, and loss of electrical energy is reduced.

In an exemplary embodiment, as shown in fig. 3, a fifth start-stop control unit 301 is further included; the first end of the fifth start-stop control unit 301 is connected with the output end of the whole electric vehicle distribution line, the second end of the fifth start-stop control unit 301 is connected with the third electric device 303, and the fifth start-stop control unit 301 is used for controlling the on-off of a third power supply line between the output end of the whole electric vehicle distribution line and the third electric device 303;

and/or, further comprising a sixth start-stop control unit 302; a first end of the sixth start-stop control unit 302 is connected with an output end of the whole vehicle distribution line, a second end of the sixth start-stop control unit 302 is connected with a fourth electric device 304, a third end of the sixth start-stop control unit 302 is connected with an ACC gear output end of the ignition switch 105, and the ignition switch 105 is used for controlling the sixth start-stop control unit 302 to be closed when the ignition switch 105 is turned on to an ACC gear; the sixth start-stop control unit 302 is configured to control on-off of a fourth power supply line between an output end of the entire electric vehicle distribution line and the fourth electric device 304.

In this embodiment, the low-voltage power supply device for an electric vehicle may further include a fifth start-stop control unit 301, where an output end of a whole-vehicle power distribution line is connected to the third electric device 303 through the fifth start-stop control unit 301, so that when the whole-vehicle power distribution line is turned on and the fifth start-stop control unit 301 is turned on, the third power supply line is turned on, and power can be supplied to the third electric device 303 through the low-voltage storage battery 103. The third electric device 303 may be an electric device that distributes power through a large power source, and may include a dual-source oil pump control device, a lifting control device, and the like, for example. A fuse may be disposed between the fifth start-stop control unit 301 and the third electric device 303, so as to avoid damage to the third power supply line and the third electric device 303 caused by a short circuit fault or the like. The fifth start-stop control unit 301 may be a mechanical switch to manually control the fifth start-stop control unit 301 to be closed when there is a power demand.

The low-voltage power supply device of the electric vehicle may further include a sixth start-stop control unit 302, and the output end of the whole-vehicle distribution line is further connected with the fourth electric equipment 304 through the sixth start-stop control unit 302, so that when the whole-vehicle distribution line is conducted, and the sixth start-stop control unit 302 is closed, the fourth power supply line is conducted, and power can be supplied to the fourth electric equipment 304 through the low-voltage storage battery 103. The sixth start-stop control unit 302 may adopt a relay switch, the ignition switch 105 is in signal connection with the sixth start-stop control unit 302, and when the whole electric distribution line is turned on, the output end of the whole electric distribution line outputs normal electricity to the ignition switch 105, so that when the ignition switch 105 is turned on to the ACC gear, the ignition switch 105 controls the sixth start-stop control unit 302 to be turned on, the fourth power supply line is turned on, and the low-voltage storage battery 103 supplies power to the fourth electric equipment 304. The fourth powered device 304 may be a powered device that supplies power to an information display device, an entertainment device, or the like in an ACC gear.

The embodiment supplies power to different electric equipment through different power supply lines so as to meet the power demand of the different electric equipment, has high flexibility, and can not cause the power-down of the control device related to the driving when the power supply line outside the first power supply line fails in the driving process, thereby ensuring the safety in the driving process.

The specific construction and operation of the low-voltage power supply device for an electric vehicle according to the present invention will be described below with reference to an alternative embodiment. As shown in fig. 4, the low-voltage power supply device of the electric vehicle of the present example includes: the low-voltage storage battery 103 and the first start-stop control unit 101 form a whole-vehicle distribution line; when the first start-stop control unit 101 is closed, the output ends (i.e., the 24V positive output end and the 24V negative output end) of the entire vehicle distribution line output normal electricity through the first fuse 401.

The output end of the whole vehicle distribution line is connected with the third start-stop control unit 201 through a second fuse 402, is connected with the fourth start-stop control unit 202 through a third fuse 403, is also connected with the fifth start-stop control unit 301 and the sixth start-stop control unit 302, the fifth start-stop control unit 301 is connected with the third electric equipment 303 through a fuse box 404, a plurality of fuses connected in parallel are arranged in the fuse box 404, and each fuse can be connected with one path of third electric equipment 303; the IG1 end of the ignition switch 105 is connected with 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 with the sixth start-stop control unit 302, and the B1 end and the B2 end of the ignition switch 105 are connected with the output end of the whole vehicle distribution line through a fourth fuse 405 for inputting electric energy; when the ignition switch 105 is turned on to 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 for supplying power to the fourth electric equipment 304; when the ignition switch 105 is turned ON, 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 first ON electricity for supplying power to the first electric equipment 203, and the fourth start-stop control unit 202 outputs second ON electricity for supplying power to the second electric equipment 204; when the ignition switch 105 is turned on to a 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 by the whole vehicle distribution line supplies power to the third electric equipment 303. The output end of the whole vehicle distribution line is also connected with the second power supply control unit 106 through a fifth fuse 406 so as to supply power to the second power supply control unit 106 when the whole vehicle distribution line is conducted; the second power supply control unit 106 is in signal connection with the first start-stop control unit 101 through the first diode 407, and is used for sending a second control signal to the first start-stop control unit 101, and the second power supply control unit 106 is also in signal connection with the IG1 end of the ignition switch 105, and is used for monitoring an 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 via a CAN bus.

The low-voltage battery 103 is connected to the first power supply control unit 104 through the second start-stop control unit 102 to supply power to a control board in the first power supply control unit 104 through the low-voltage battery 103 when the second start-stop control unit 102 is closed. The first power supply control unit 104 is further connected with a power battery of the electric vehicle through a high-voltage input positive electrode and a high-voltage input negative electrode, and when the first power supply control unit 104 recognizes that the low-voltage storage battery 103 meets the charging condition, the first power supply control unit sends a second request signal to the power battery, and converts the second voltage signal output by the power battery into 24V voltage to charge the low-voltage storage battery 103; the low-voltage storage 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 storage battery 103 and are not shown in fig. 4), and the first power supply control unit 104 is respectively connected with the voltage sensor, the current sensor 409 and the temperature sensor through a voltage acquisition wire harness 410, a current acquisition wire harness 411 and a temperature acquisition wire harness 412 so as to acquire discharge voltage, discharge current and temperature data of the low-voltage storage battery 103; the first power supply control unit 104 is further connected with an output end of a whole-vehicle distribution line, on one hand, the whole-vehicle distribution line is used for supplying power to a voltage conversion component in the first power supply control unit 104, and on the other hand, when the low-voltage storage battery 103 fails, the first power supply control unit 104 converts a first voltage signal output by the power battery into 24V voltage to provide normal electricity for the electric vehicle; the first power supply control unit 104 is in signal connection with the first start-stop control unit 101 through the second diode 408, and is configured to send a first control signal to the first start-stop control unit 101.

The operation flow of the low-voltage power supply device for an electric vehicle is shown in fig. 5, and includes: when the vehicle has electricity demand, an operator presses the second start-stop control unit 102 for three seconds to close the second start-stop control unit 102, and a control panel in the first power supply control unit 104 enters a working mode; the first power supply control unit 104 is used for controlling the low-voltage storage battery 103 to perform self-check, if the self-check has a fault, a fault lamp is turned on to prompt the fault so as to facilitate timely troubleshooting of an operator, if the self-check has no fault, the first power supply control unit 104 is used for acquiring discharge voltage, discharge current and temperature data of the low-voltage storage battery 103 in real time, and sending a first control signal to the first start-stop control unit 101 when the discharge voltage, the discharge current and the temperature data meet preset ranges so as to control the first start-stop control unit 101 to be closed, and normal electricity is provided for the whole vehicle through the low-voltage storage battery 103; when the fifth start-stop control unit 301 is closed, power is supplied to the third electric equipment 303 through the fuse box 404; meanwhile, the output end of the low-voltage storage battery 103 distributes electricity normally to the whole vehicle through a first fuse 401, the ignition switch 105 is connected with the output end of the distribution line of the whole vehicle through a fourth fuse 405, when an operator drives the ignition switch 105 from the LOCK gear to the ACC gear according to the needs, the ignition switch 105 controls the sixth start-stop control unit 302 to be closed, and the low-voltage storage battery 103 supplies electricity to the fourth electric equipment 304; when an operator drives the ignition switch 105 from the LOCK gear to the ON gear according to the requirement, the ignition switch 105 controls the third start-stop control unit 201 and the fourth start-stop control unit 202 to be closed, and provides first ON electricity for the first electric equipment 203 and second ON electricity for the second electric equipment 204 through the low-voltage storage battery 103; meanwhile, whether the second ON electricity has a signal or not is detected through the first power supply control unit 104, if no signal exists, the low-voltage storage battery 103 is controlled to enter a low-power consumption sleep mode, and discharge voltage, discharge current and temperature data of the low-voltage storage battery 103 are collected in real time; if the signal exists, the second power supply control unit 106 outputs a second control signal to the first start-stop control unit 101, and controls the first start-stop control unit 101 to keep a closed state so as to ensure that the electric vehicle can temporarily run when the first power supply control unit 104 fails; when the low-voltage storage battery 103 fails, the first power supply control unit 104 requests the power battery to carry out high-voltage input through a bus command, and the first power supply control unit 104 converts the voltage output by the power battery into 24V voltage to supply power to the whole vehicle until the second ON power lasts for more than 5 seconds without a signal.

In addition, during the power supply process of the low-voltage storage battery 103, the first power supply control unit 104 monitors and calculates the residual capacity of the low-voltage storage battery 103 and the discharge current of the low-voltage storage battery 103 in real time, when the residual capacity of the low-voltage storage battery 103 is lower than 30% of the rated value or the discharge current of the low-voltage storage battery 103 is greater than 20 amperes, the first power supply control unit 104 requests high-voltage power distribution input through a bus command, the first power supply control unit 104 converts the output voltage of the power battery into 24V voltage to charge the low-voltage storage battery 103, and when the residual capacity of the low-voltage storage battery 103 is greater than 95%, the charging is stopped; when the first power supply control unit 104 monitors that the second ON power lasts for more than 5 seconds and no signal is output, and the second power supply control unit 106 monitors that the IG1 end of the ignition switch 105 lasts for more than 5 seconds, the low-voltage storage battery 103 is controlled to enter the low-power consumption sleep mode again; when the vehicle is parked for a long time, the second start-stop control unit 102 is pressed for five seconds, the second start-stop control unit 102 is turned off, the first power supply control unit 104 turns off the first start-stop control unit 101, and the low-voltage storage battery 103 stops supplying power to the outside.

The low-voltage power supply method for the electric vehicle provided by the invention is described below, and the low-voltage power supply method for the electric vehicle is realized based on the low-voltage power supply device for the electric vehicle, which are described above, and can be correspondingly referred to each other. As shown in fig. 6, the low-voltage power supply method for the electric vehicle at least comprises the following steps:

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; the first control signal is used for controlling the first start-stop control unit to be closed; the first start-stop control unit is arranged in the whole vehicle distribution line of the low-voltage storage battery and used for controlling the on-off of the whole vehicle distribution line; the low-voltage storage battery is connected with the first power supply control unit through the second start-stop control unit, and the low-voltage storage battery supplies power for the first power supply control unit when the second start-stop control unit is closed; the low-voltage storage battery and the first power supply control unit are integrated in the same box body;

s602, when the whole vehicle distribution line is conducted, the second power supply control unit outputs a second control signal to the first start-stop control unit; the second power supply control unit is connected with the output end of the whole vehicle distribution line, and the second control signal is used for controlling the first start-stop control unit to keep a closed state;

and S603, the second power supply control unit monitors an output signal of an ON gear output end of the ignition switch, and stops outputting the second control signal to the first start-stop control unit when the electric vehicle is powered down according to the output signal of the ON gear output end.

In an exemplary embodiment, further comprising:

the first power supply control unit obtains an output signal of an output end of the whole-vehicle distribution line, and sends a first request signal to the power battery when determining that the low-voltage storage battery fails based on the output signal, wherein the first request signal is used for controlling the power battery to output a first voltage signal to the first power supply control unit;

the first power supply control unit converts the first voltage signal into power supply voltage and outputs the power supply voltage through the output end of the whole vehicle distribution circuit.

In an exemplary embodiment, further comprising:

the first power supply control unit determines that the first control signal is stopped from being output to the first start-stop control unit when the low-voltage storage battery fails, and sends a failure signal to the second power supply control unit;

and the second power supply control unit stops outputting the second control signal to the first start-stop control unit when receiving the fault signal.

In an exemplary embodiment, further comprising:

the first power supply control unit acquires working state data of the low-voltage storage battery, and when the low-voltage storage battery meets a charging condition based on the working state data, a second request signal is sent to the power battery, and the second request signal is used for controlling the power battery to output a second voltage signal to the first power supply control unit;

The first power supply control unit converts the second voltage signal into a charging voltage for charging the low-voltage storage battery.

In an exemplary embodiment, a first reverse preventing module is arranged between the first power supply control unit and the first start-stop control unit, and a second reverse preventing module is arranged between the second power supply control unit and the first start-stop control unit.

In an exemplary embodiment, further comprising:

if the ignition switch is turned ON to an ON gear, the third start-stop control unit and the fourth start-stop control unit are controlled to be closed; the third start-stop control unit is used for controlling the on-off of a first power supply circuit between the output end of the whole-vehicle distribution circuit and first electric equipment, and the fourth start-stop control unit is used for controlling the on-off of a second power supply circuit between the output end of the whole-vehicle distribution circuit and second electric equipment; the first electric equipment is a driving-related control device, and the second electric equipment is a non-driving-related control device.

In an exemplary embodiment, further comprising:

and the first power supply control unit acquires an electric signal on the second power supply line, and stops outputting the first control signal to the first start-stop control unit when determining that the second power supply line is disconnected based on the electric signal.

In an exemplary embodiment, further comprising:

if the fifth start-stop control unit is closed, controlling the output end of the whole-vehicle distribution line to be conducted with a third power supply line between third electric equipment;

and/or if the ignition switch is turned on to ACC gear, the sixth start-stop control unit is controlled to be closed; and the sixth start-stop control unit is used for controlling the on-off of a fourth power supply circuit between the output end of the whole-vehicle power distribution circuit and the fourth electric equipment.

The invention also provides an electric vehicle, comprising the electric vehicle low-voltage power supply device according to any embodiment.

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

The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.

From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-voltage power supply device for an electric vehicle, comprising: the device comprises a first start-stop control unit, a second start-stop control unit, an ignition switch, a low-voltage storage battery, a first power supply control unit and a second power supply control unit; the low-voltage storage battery and the first power supply control unit are integrated in the same box body;

2. The electric vehicle low-voltage power supply device according to claim 1, characterized in that the first power supply control unit is further connected with an output end of the whole vehicle distribution line and a power battery of the electric vehicle;

3. The electric vehicle low-voltage power supply device according to claim 2, wherein 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 it is determined that the low-voltage battery fails, and send a failure signal to the second power supply control unit;

4. The electric vehicle low-voltage power supply device according to claim 2, wherein the first power supply control unit is further configured to acquire operating state data of the low-voltage storage battery, and send a second request signal to the power battery when it is determined that the low-voltage storage battery satisfies a charging condition based on the operating state data, the second request signal being configured to control the power battery to output a second voltage signal to the first power supply control unit;

5. The electric vehicle low-voltage power supply device according to claim 1, wherein a first reverse prevention module is provided between the first power supply control unit and the first start-stop control unit, and a second reverse prevention module is provided between the second power supply control unit and the first start-stop control unit.

6. The electric vehicle low-voltage power supply apparatus according to any one of claims 1 to 5, characterized by further comprising a third start-stop control unit and a fourth start-stop control unit;

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

8. The electric vehicle low-voltage power supply apparatus according to claim 1, characterized by further comprising a fifth start-stop control unit; the first end of the fifth start-stop control unit is connected with the output end of the whole electric vehicle distribution line, the second end of the fifth start-stop control unit is connected with third electric equipment, and the fifth start-stop control unit is used for controlling the on-off of a third power supply line between the output end of the whole electric vehicle distribution line and the third electric equipment;

9. A low-voltage power supply method for an electric vehicle, comprising:

10. An electric vehicle, characterized by comprising: the electric vehicle low-voltage power supply apparatus according to any one of claims 1 to 8.