Power supply method and device for electric vehicle and electric vehicle

Abstract

The present invention relates to the field of electric vehicles, and provides a power supply method, device and electric vehicle for an electric vehicle, the method comprising: obtaining an operation signal of the electric vehicle; generating a first control instruction based on the operation signal, and sending the first control instruction to a corresponding first switch device; the first control instruction is used to control the closing or disconnection of the first switch device, and the closing or disconnection of the first switch device is used to control the connection or disconnection of the power supply circuit of the power battery pack and the corresponding electric device; wherein the voltage platform of the power battery pack is greater than a preset voltage, and a voltage conversion device is provided in part or all of the power supply circuits, and the voltage conversion device is used to convert the output voltage of the power battery pack to supply power to the corresponding electric device, and the output voltage of the voltage conversion device is less than or equal to the preset voltage. The present invention can effectively improve the charging efficiency while ensuring the reliability and comprehensive cost of the electric vehicle.

Description

Technical Field

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

[0002] With the continuous upgrading of environmental protection and emission requirements, the purchase cost of fuel vehicles continues to increase, and the user's use and maintenance costs are also increasing. Users need transportation tools that can meet environmental protection and emission requirements while being economical and efficient. Electric vehicles are one of the products that meet the above needs of customers.

[0003] However, "slow charging" is the core pain point of pure electric vehicles. At present, increasing the charging current or replacing the battery is usually used to increase the charging speed and shorten the charging time. However, pure electric vehicles have a large amount of electricity, and the current charging current has reached the current receiving current of the current national standard charging pile (400 amps). Increasing the charging current does not contribute much to shortening the charging time, and the current charging current has reached the limit current (400 amps) of the natural cooling of the charging system. Further increasing the charging current requires liquid cooling and other methods, which will lead to a significant increase in costs. In addition, due to the high cost of battery replacement and the large investment in the construction of battery replacement stations, the use of battery replacement will lead to a significant increase in costs. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a power supply method and device for an electric vehicle and an electric vehicle.

[0005] The present invention provides a power supply method for an electric vehicle, comprising:

[0006] Acquiring an operation signal of an electric vehicle;

[0007] A first control instruction is generated based on the operation signal, and the first control instruction is sent to the corresponding first switch device; the first control instruction is used to control the closing or opening of the first switch device, and the closing or opening of the first switch device is used to control the connection or disconnection of the power supply circuit between the power battery pack and the corresponding electrical equipment; wherein, the voltage platform of the power battery pack is greater than a preset voltage, and a voltage conversion device is provided in part or all of the power supply circuit, and the voltage conversion device is used to convert the output voltage of the power battery pack to supply power to the corresponding electrical equipment, and the output voltage of the voltage conversion device is less than or equal to the preset voltage.

[0008] According to the power supply method for an electric vehicle provided by the present invention, the electrical equipment includes a low-voltage device;

[0009] Among them, the voltage platform of the low-voltage equipment is less than or equal to the preset voltage, the voltage conversion device is provided in the power supply circuit corresponding to the low-voltage equipment, and the output voltage of the voltage conversion transposition is the same as the voltage platform of the low-voltage equipment.

[0010] According to the power supply method for electric vehicles provided by the present invention, the electrical equipment further includes high-voltage equipment;

[0011] Among them, the voltage platform of the high-voltage equipment is the same as the voltage platform of the power battery pack, and the voltage conversion device is not provided in the power supply circuit corresponding to the high-voltage equipment.

[0012] According to the power supply method for an electric vehicle provided by the present invention, the power battery pack is charged through the following steps:

[0013] When it is determined to establish a communication connection with the charging device, a charging request instruction is sent to the charging device; wherein the charging request instruction includes a requested charging voltage corresponding to the power battery pack;

[0014] receiving a charging voltage fed back by the charging device;

[0015] When it is determined that the voltage to be charged is consistent with the requested charging voltage, a second control instruction is generated and sent to the charging control switch; the second control instruction is used to control the closing of the charging control switch, and the closing or opening of the charging control switch is used to control the connection or disconnection of the charging circuit of the power battery pack.

[0016] The power supply method for an electric vehicle provided by the present invention further includes:

[0017] Sending a detection instruction to each of the first switch devices and / or the charging control switch;

[0018] Based on a feedback signal of the first switching device and / or the charging control switch, a fault detection result of the first switching device and / or the charging control switch is determined.

[0019] According to the power supply method for an electric vehicle provided by the present invention, the generating of a first control instruction based on the operation signal and sending the first control instruction to a corresponding first switch device comprises:

[0020] When it is determined that the electrical device needs to be pre-charged, a pre-charging instruction is generated based on the operation signal, and the pre-charging instruction is sent to a second switch device of a pre-charging circuit of the electrical device, wherein the pre-charging instruction is used to control the closing of the second switch device; wherein the closing or opening of the second switch device is used to control the connection or disconnection of the pre-charging circuit;

[0021] When it is determined that the pre-charging of the electrical equipment is completed, a pre-charging end instruction and the first control instruction are generated, and the pre-charging end instruction is sent to the second switching device, and the first control instruction is sent to the corresponding first switching device. The pre-charging end instruction is used to control the second switching device to disconnect.

[0022] The present invention also provides a power supply device for an electric vehicle, comprising:

[0023] A data acquisition module, used for acquiring an operation signal of the electric vehicle;

[0024] A computing module, used to generate a first control instruction based on the operation signal, and send the first control instruction to the corresponding first switching device; the first control instruction is used to control the closing or opening of the first switching device, and the closing or opening of the first switching device is used to control the connection or disconnection of the power supply circuit between the power battery pack and the corresponding electrical equipment; wherein, the voltage platform of the power battery pack is greater than a preset voltage, and a voltage conversion device is provided in part or all of the power supply circuit, and the voltage conversion device is used to convert the output voltage of the power battery pack to supply power to the corresponding electrical equipment, and the output voltage of the voltage conversion device is less than or equal to the preset voltage.

[0025] The present invention also provides an electric vehicle, comprising: a power battery pack, an electric device, a first switch device, a voltage conversion device and a control device;

[0026] The control device is used to obtain an operation signal of the electric vehicle; and is also used to generate a first control instruction based on the operation signal, and send the first control instruction to the corresponding first switch device; the first control instruction is used to control the closing or opening of the first switch device, and the closing or opening of the first switch device is used to control the connection or disconnection of the power supply circuit between the power battery pack and the corresponding electrical equipment;

[0027] The voltage platform of the power battery pack is greater than a preset voltage;

[0028] The voltage conversion device is arranged in part or all of the power supply circuit, and is used to convert the output voltage of the power battery pack to supply power to the corresponding electrical equipment. The output voltage of the voltage conversion device is less than or equal to the preset voltage.

[0029] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a method for powering an electric vehicle as described in any one of the above is implemented.

[0030] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method for powering an electric vehicle as described in any one of the above is implemented.

[0031] The power supply method, device and electric vehicle provided by the present invention obtain an operation signal of the electric vehicle, generate a first control instruction based on the operation signal and send it to the corresponding first switch device to control the closing or opening of the first switch device, and control the power battery pack to supply power or stop supplying power to the corresponding electrical equipment through the closing or opening of the first switch device, thereby effectively ensuring the normal and stable operation of the electric vehicle; at the same time, since the voltage platform of the power battery pack is greater than the preset voltage, and a voltage conversion device is provided in part or all of the power supply circuit, the output voltage of the power battery pack is reduced to less than or equal to the preset voltage through the voltage conversion device to supply power to the corresponding electrical equipment, thereby effectively improving the charging efficiency while ensuring the reliability and comprehensive cost of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces 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 creative work.

[0033] Figure 1 It is a schematic flow chart of a power supply method for an electric vehicle provided by the present invention;

[0034] Figure 2 It is a structural schematic diagram of a power supply device for an electric vehicle provided by the present invention;

[0035] Figure 3 is a schematic structural diagram of an electric vehicle provided by the present invention;

[0036] Figure 4 This is one of the structural schematic diagrams of the power supply system of the electric tractor provided by the present invention;

[0037] Figure 5 This is the second structural schematic diagram of the power supply system of the electric tractor provided by the present invention;

[0038] Figure 6 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Combine the following Figure 1 The power supply method of the electric vehicle of the present invention is described. The power supply method of the electric vehicle of the present invention is executed by an electronic device such as a control device or the hardware and / or software therein. The control device can be the control device of the electric vehicle itself, such as a BMS (Battery Management System) controller, or a newly added control device. Figure 1 As shown, the power supply method of the electric vehicle of the present invention includes:

[0041] S101. Acquire an operation signal of an electric vehicle.

[0042] Specifically, an electric vehicle is a vehicle that uses a power battery as an energy source, such as an electric passenger car, an electric commercial vehicle, etc. The electric commercial vehicle is an electric tractor, an electric heavy truck, etc. The operation signal of the electric vehicle is a signal input by the user through the control components of the electric vehicle, such as a high-voltage power-on request signal, a driving request signal, a water cooling start signal, a water heating start signal, a battery pack heating request signal, and an air conditioning start signal.

[0043] S102. Generate a first control instruction based on the operation signal, and send the first control instruction to the corresponding first switch device; the first control instruction is used to control the closing or opening of the first switch device, and the closing or opening of the first switch device is used to control the connection or disconnection of the power supply circuit between the power battery pack and the corresponding electrical equipment; wherein, the voltage platform of the power battery pack is greater than a preset voltage, and a voltage conversion device is provided in part or all of the power supply circuit, and the voltage conversion device is used to convert the output voltage of the power battery pack to supply power to the corresponding electrical equipment, and the output voltage of the voltage conversion device is less than or equal to the preset voltage.

[0044] Specifically, the specific method of generating the first control instruction based on the operation signal can be set according to actual needs. For example, the vehicle can be self-checked after receiving the operation signal, and the corresponding first control instruction can be generated after determining that there is no abnormality; the electrical equipment can be pre-charged according to the needs of the electrical equipment after receiving the operation signal, and the corresponding first control instruction can be generated after the pre-charging is completed; the corresponding first control instruction can also be directly generated after receiving the operation signal.

[0045] The power battery pack of the electric vehicle is used to supply power to the electrical equipment of the electric vehicle. The first switch device is arranged in the power supply circuit between the power battery pack and the corresponding electrical equipment, and is used to control the connection or disconnection of the corresponding power supply circuit. When the power supply circuit is connected, the power battery pack supplies power to the corresponding electrical equipment; when the power supply circuit is disconnected, the power battery pack stops supplying power to the corresponding electrical equipment.

[0046] The voltage platform of the power battery pack is greater than the preset voltage, and the specific value of the preset voltage can be set according to actual needs. As an optional implementation, the preset voltage can be set according to the common voltage platform of electric vehicles currently on the market, for example, it can be set to 600 volts; the voltage platform of the power battery pack is greater than the preset voltage, for example, it can be set to 800 volts or higher, which can effectively increase the charging power of the power battery pack, thereby shortening the charging time of the electric vehicle and improving the charging efficiency of the electric vehicle.

[0047] In the power supply circuit corresponding to each power-consuming device, a voltage conversion device is provided in part or all of the power supply circuits, and the voltage conversion transposition is used to convert the output voltage of the power battery pack to supply power to the corresponding power-consuming device, that is, when a voltage conversion device is provided in the power supply circuit, the corresponding power-consuming device is supplied with power through the output voltage of the voltage conversion device, and when the power supply device is not provided with a voltage conversion device, the corresponding power-consuming device is supplied with power directly through the output voltage of the power battery pack. Among them, the output voltage of the voltage conversion device is less than or equal to the preset voltage, that is, the voltage platform of the power-consuming device supplied with power by the output voltage of the voltage conversion device can adopt a mass-produced mature device with a voltage platform less than or equal to 600 volts, so that the reliability of the power-consuming device is high, and the comprehensive cost is effectively reduced, so that the reliability and comprehensive cost of the electric vehicle can be guaranteed while improving the charging efficiency. The voltage conversion device can adopt a DCDC (Direct Current-DirectCurrent, DC to DC) voltage converter to convert the 800 volt output voltage of the power battery pack into the power supply voltage of the corresponding power-consuming device. Experiments have shown that when the voltage platform of the power battery pack is increased from 600 volts of the existing electric vehicle to 800 volts, the charging time can be shortened by more than 20%.

[0048] In addition, during the power supply process, the control device can also obtain the discharge current of the corresponding power battery pack to prevent damage to the corresponding electrical equipment due to abnormal discharge current.

[0049] Traditional methods usually use increasing charging current or battery replacement to increase charging speed and shorten charging time. However, pure electric vehicles carry a large amount of electricity, and the current charging current has reached the current current (400A) of the current national standard charging pile. Increasing the charging current does not contribute much to shortening the charging time. The current charging current has reached the limit current (400A) of natural cooling of the charging system. Further increasing the charging current requires the use of liquid cooling and other methods, which will greatly increase costs. In addition, due to the high cost of battery replacement and the large investment in the construction of battery replacement stations, the use of battery replacement will greatly increase costs.

[0050] The embodiment of the present invention obtains an operation signal of the electric vehicle, generates a first control instruction based on the operation signal and sends it to the corresponding first switch device to control the closing or opening of the first switch device, and controls the power battery pack to supply power or stop supplying power to the corresponding electrical equipment through the closing or opening of the first switch device, thereby effectively ensuring the normal and stable operation of the electric vehicle; at the same time, since the voltage platform of the power battery pack is greater than the preset voltage, and a voltage conversion device is provided in part or all of the power supply circuit, the output voltage of the power battery pack is reduced to less than or equal to the preset voltage through the voltage conversion device to supply power to the corresponding electrical equipment, thereby effectively improving the charging efficiency while ensuring the reliability and comprehensive cost of the electric vehicle.

[0051] Based on the above embodiment, the electrical equipment includes low-voltage equipment;

[0052] Among them, the voltage platform of the low-voltage equipment is less than or equal to the preset voltage, the voltage conversion device is provided in the power supply circuit corresponding to the low-voltage equipment, and the output voltage of the voltage conversion transposition is the same as the voltage platform of the low-voltage equipment.

[0053] Specifically, the voltage platform of the low-voltage equipment is less than or equal to a preset voltage, for example, less than or equal to 600 volts. That is, the low-voltage equipment can adopt mature mass-produced equipment with a voltage platform less than or equal to 600 volts, so that the low-voltage equipment has high reliability and low overall cost.

[0054] A voltage conversion device is set in the power supply circuit corresponding to the low-voltage equipment to reduce the output voltage of the power battery pack to the voltage platform of the corresponding low-voltage equipment and then supply power to the low-voltage equipment, thereby ensuring the normal and stable operation of the low-voltage equipment.

[0055] It is understandable that the voltage platforms of each low-voltage device may be the same or different. When the voltage platforms of each low-voltage device are the same, for example, all are 600 volts, a voltage conversion device may be provided to power each low-voltage device through the output voltage of the voltage conversion device, for example, the output voltage of the power battery pack of 800 volts is converted to 600 volts through an 800 volt to 600 volt DCDC voltage converter to power each low-voltage device. When the voltage platforms of each low-voltage device are different, multiple voltage conversion devices may be provided, and different voltage conversion devices convert the output voltage of the power battery pack of 800 volts into voltages of different magnitudes, so as to power the low-voltage devices of the corresponding voltage platforms through the output voltage of each voltage conversion device.

[0056] The electrical equipment of an electric vehicle can be all low-voltage equipment, or some of the electrical equipment can be low-voltage equipment and some of the electrical equipment can be high-voltage equipment, which can be set according to actual needs. Among them, the high-voltage equipment can be directly powered by the output voltage of the power battery pack, that is, the voltage platform of the high-voltage equipment is the same as the voltage platform of the power battery pack.

[0057] In an embodiment of the present invention, the electrical equipment includes a low-voltage equipment, the voltage platform of the low-voltage equipment is less than or equal to a preset voltage, and a voltage conversion device is provided in the power supply circuit corresponding to the low-voltage equipment, and the output voltage of the voltage conversion device is the same as the voltage platform of the low-voltage equipment, thereby improving the charging efficiency while ensuring the reliability and comprehensive cost of the electric vehicle.

[0058] Based on any of the above embodiments, the electrical equipment further includes high voltage equipment;

[0059] Among them, the voltage platform of the high-voltage equipment is the same as the voltage platform of the power battery pack, and the voltage conversion device is not provided in the power supply circuit corresponding to the high-voltage equipment.

[0060] Specifically, the voltage platform of the high-voltage equipment is the same as the voltage platform of the power battery pack, that is, the voltage platform of the power-consuming equipment is increased to the voltage platform used by the power battery pack, for example, 800 volts. No voltage conversion device is provided in the power supply circuit corresponding to the high-voltage equipment, that is, the output voltage of the power battery pack is directly used to power the high-voltage equipment.

[0061] The selection of high-voltage equipment can be set according to actual needs. For example, the voltage platform of electrical equipment with power greater than the preset power (i.e., electrical equipment with higher power) can be upgraded to the voltage platform used by the power battery pack, such as the driving motor, so as to reduce the difficulty and cost of voltage conversion, and effectively improve the charging efficiency while ensuring that fewer electrical equipment is upgraded to the high-voltage platform; wherein, the preset power can be set according to actual needs, for example, 50% of the total power of the electric vehicle. Electrical equipment with a relatively mature high-voltage platform can also be determined as high-voltage equipment to effectively improve the charging efficiency while ensuring the reliability of the electrical equipment; high-voltage equipment can also be determined in combination with the power consumption of the electrical equipment and the technical maturity of the high-voltage platform electrical equipment. Taking an electric tractor as an example, the driving motor can be determined as a high-voltage device, and the power battery pack can be used directly to power the driving motor; other electrical equipment can be determined as low-voltage equipment, and the output voltage of the power battery pack is converted by a voltage conversion device to power it, such as a steering oil pump, an air pump, an air conditioning compressor, a water cooling unit, a water heater, etc.

[0062] The electrical equipment in the embodiment of the present invention includes both low-voltage equipment and high-voltage equipment. The voltage platform of the high-voltage equipment is the same as the voltage platform of the power battery pack, and no voltage conversion device is provided in the power supply circuit corresponding to the high-voltage equipment. This can further reduce the difficulty of voltage conversion and improve charging efficiency while ensuring the reliability and comprehensive cost of the electric vehicle.

[0063] Based on any of the above embodiments, the power battery pack is charged through the following steps:

[0064] When it is determined to establish a communication connection with the charging device, a charging request instruction is sent to the charging device; wherein the charging request instruction includes a requested charging voltage corresponding to the power battery pack;

[0065] receiving a charging voltage fed back by the charging device;

[0066] When it is determined that the voltage to be charged is consistent with the requested charging voltage, a second control instruction is generated and sent to the charging control switch; the second control instruction is used to control the closing of the charging control switch, and the closing or opening of the charging control switch is used to control the connection or disconnection of the charging circuit of the power battery pack.

[0067] Specifically, the control device can collect the power of the power battery pack in real time, and issue a charging reminder when the current is lower than a preset value; the user can insert the charging plug of the charging device into the charging port of the electric vehicle according to the charging reminder information or charging requirements to charge the power battery pack through the charging plug. After the charging plug is inserted into the charging port, the electric vehicle establishes a communication connection with the charging device. When the control device determines that a communication connection is established with the charging device, it sends a charging request to the charging device, and the charging request includes the requested charging voltage of the power battery pack. After receiving the charging request, the charging device feeds back the voltage to be charged to the control device of the electric vehicle; the voltage to be charged is the charging voltage that the charging device can provide. When the control device determines that the charging voltage fed back by the charging device is consistent with the requested charging voltage, a second control instruction is generated and sent to the charging control switch to control the charging circuit of the power battery pack to be connected. Among them, the voltage to be charged is consistent with the requested charging voltage, that is, the difference between the voltage to be charged and the requested charging voltage is less than or equal to the preset voltage value. The charging control switch and the first switch device may overlap.

[0068] In addition, during the charging process, the control device can also obtain the charging current of the power battery pack to prevent damage to the power battery pack due to abnormal charging current.

[0069] When determining to establish a communication connection with the charging device, the embodiment of the present invention sends a request instruction including the requested charging voltage corresponding to the power battery pack to the charging device, and receives the voltage to be charged fed back by the charging device. When it is determined that the voltage to be charged is consistent with the requested charging voltage, a second control instruction is generated to control the closing of the charging control switch, and then control the corresponding charging circuit to be connected, which can effectively avoid damage to the power battery pack due to inconsistent charging voltage and ensure the safety of charging of the power battery pack.

[0070] Based on any of the above embodiments, it also includes:

[0071] Sending a detection instruction to each of the first switch devices and / or the charging control switch;

[0072] Based on a feedback signal of the first switching device and / or the charging control switch, a fault detection result of the first switching device and / or the charging control switch is determined.

[0073] Specifically, the fault detection result may include no fault and a specific fault type, such as a sticking fault and an open circuit fault. The detection instruction may be a current signal. For example, when the first switch device and / or the charging control switch is disconnected, a current signal may be sent to the corresponding first switch device and / or the charging control switch through the control device, and the current signal fed back by the first switch device and / or the charging control switch is 0, indicating that there is no sticking fault in the corresponding first switch device and / or the charging control switch, otherwise, there is a sticking fault; when the first switch device and / or the charging control switch is closed, a current signal may be sent to the corresponding first switch device and / or the charging control switch through the control device, and the current signal fed back by the first switch device and / or the charging control switch is 0, indicating that there is an open circuit fault in the corresponding first switch device and / or the charging control switch, otherwise, there is no open circuit fault.

[0074] It is understandable that fault detection can be performed when the vehicle high voltage is powered on, or it can be performed at preset time intervals according to actual needs.

[0075] The embodiment of the present invention sends a detection instruction to the first switch device and / or the charging control switch, and determines the fault detection result of the first switch device and / or the charging control switch based on the feedback signal of the first switch device and / or the charging control switch, so that when a fault occurs in the first switch device and / or the charging control switch, it can be discovered in time and corresponding measures can be taken, thereby ensuring the reliability of the operation of the electric vehicle and avoiding damage to electrical equipment.

[0076] Based on any of the above embodiments, generating a first control instruction based on the operation signal, and sending the first control instruction to the corresponding first switch device includes:

[0077] When it is determined that the electrical device needs to be pre-charged, a pre-charging instruction is generated based on the operation signal, and the pre-charging instruction is sent to a second switch device of a pre-charging circuit of the electrical device, wherein the pre-charging instruction is used to control the closing of the second switch device; wherein the closing or opening of the second switch device is used to control the connection or disconnection of the pre-charging circuit;

[0078] When it is determined that the pre-charging of the electrical equipment is completed, a pre-charging end instruction and the first control instruction are generated, and the pre-charging end instruction is sent to the second switching device, and the first control instruction is sent to the corresponding first switching device. The pre-charging end instruction is used to control the second switching device to disconnect.

[0079] Specifically, after receiving the operation signal, it can be determined whether the electrical equipment needs pre-charging. If pre-charging is required, the corresponding second switch device is first controlled to close to pre-charge the electrical equipment. After the pre-charging is completed, the second switch device is controlled to open, and the corresponding first switch device is controlled to close to supply power to the electrical equipment normally.

[0080] The specific method for determining whether an electrical device needs to be pre-charged can be set according to actual needs. For example, it can be determined based on the type of the electrical device, or the electrical devices that need to be pre-charged can be pre-defined and stored in the control device so that after receiving the operation signal, it can quickly and accurately determine whether the corresponding electrical device needs to be pre-charged.

[0081] The pre-charging circuit may include a second switch device and a pre-charging resistor, and the second switch device may overlap with the first switch device and the charging control switch. At the same time, the control device may also send a detection instruction to each second switch device, and determine the fault detection result of the second switch device based on the feedback signal of the second switch device.

[0082] The specific method for determining whether the pre-charging of the electrical equipment is completed can also be set according to actual needs. For example, the pre-charging can be determined to be completed when the voltage of the electrical equipment reaches a preset voltage (such as 95% U, U is the rated voltage of the electrical equipment), or when the pre-charging time reaches a preset time.

[0083] When the embodiment of the present invention determines that an electrical device needs to be pre-charged, a pre-charging instruction is generated based on an operation signal and sent to the second switch device of the pre-charging circuit of the electrical device to control the pre-charging circuit of the electrical device to be connected for pre-charging. After the pre-charging is completed, a pre-charging end instruction and a first control instruction are generated, and the pre-charging end instruction is sent to the second switch device of the pre-charging circuit of the electrical device, and the first control instruction is sent to the first switch device of the power supply circuit of the electrical device, thereby effectively ensuring the normal operation of each electrical device.

[0084] The power supply device of the electric vehicle provided by the present invention is described below. The power supply device of the electric vehicle described below and the power supply method of the electric vehicle described above can be referred to each other. Figure 2 As shown, the power supply device of the electric vehicle of the present invention comprises:

[0085] A data acquisition module 201 is used to acquire an operation signal of the electric vehicle;

[0086] The calculation module 202 is used to generate a first control instruction based on the operation signal, and send the first control instruction to the corresponding first switch device; the first control instruction is used to control the closing or opening of the first switch device, and the closing or opening of the first switch device is used to control the connection or disconnection of the power supply circuit between the power battery pack and the corresponding electrical equipment; wherein, the voltage platform of the power battery pack is greater than a preset voltage, and a voltage conversion device is provided in part or all of the power supply circuit, and the voltage conversion device is used to convert the output voltage of the power battery pack to supply power to the corresponding electrical equipment, and the output voltage of the voltage conversion device is less than or equal to the preset voltage.

[0087] Based on the above embodiment, the electrical equipment includes low-voltage equipment;

[0088] Among them, the voltage platform of the low-voltage equipment is less than or equal to the preset voltage, the voltage conversion device is provided in the power supply circuit corresponding to the low-voltage equipment, and the output voltage of the voltage conversion transposition is the same as the voltage platform of the low-voltage equipment.

[0089] Based on any of the above embodiments, the electrical equipment further includes high voltage equipment;

[0090] Among them, the voltage platform of the high-voltage equipment is the same as the voltage platform of the power battery pack, and the voltage conversion device is not provided in the power supply circuit corresponding to the high-voltage equipment.

[0091] Based on any of the above embodiments, it further includes a charging module, wherein the charging module is used to:

[0092] When it is determined to establish a communication connection with the charging device, a charging request instruction is sent to the charging device; wherein the charging request instruction includes a requested charging voltage corresponding to the power battery pack;

[0093] receiving a charging voltage fed back by the charging device;

[0094] When it is determined that the voltage to be charged is consistent with the requested charging voltage, a second control instruction is generated and sent to the charging control switch; the second control instruction is used to control the closing of the charging control switch, and the closing or opening of the charging control switch is used to control the connection or disconnection of the charging circuit of the power battery pack.

[0095] Based on any of the above embodiments, it further includes a detection module, wherein the detection module is used to:

[0096] Sending a detection instruction to each of the first switch devices and / or the charging control switch;

[0097] Based on a feedback signal of the first switching device and / or the charging control switch, a fault detection result of the first switching device and / or the charging control switch is determined.

[0098] Based on any of the above embodiments, the calculation module 202 is specifically used for:

[0099] When it is determined that the electrical device needs to be pre-charged, a pre-charging instruction is generated based on the operation signal, and the pre-charging instruction is sent to a second switch device of a pre-charging circuit of the electrical device, wherein the pre-charging instruction is used to control the closing of the second switch device; wherein the closing or opening of the second switch device is used to control the connection or disconnection of the pre-charging circuit;

[0100] When it is determined that the pre-charging of the electrical equipment is completed, a pre-charging end instruction and the first control instruction are generated, and the pre-charging end instruction is sent to the second switching device, and the first control instruction is sent to the corresponding first switching device. The pre-charging end instruction is used to control the second switching device to disconnect.

[0101] The electric vehicle provided by the present invention is described below. The electric vehicle described below and the power supply method of the electric vehicle described above can be referred to each other. Figure 3 As shown, the electric vehicle of the present invention comprises: a power battery pack 301, an electric device 302, a first switch device 303, a voltage conversion device 304 and a control device 305;

[0102] The control device 305 is used to obtain an operation signal of the electric vehicle; it is also used to generate a first control instruction based on the operation signal, and send the first control instruction to the corresponding first switch device 303; the first control instruction is used to control the closing or opening of the first switch device 303, and the closing or opening of the first switch device 303 is used to control the connection or disconnection of the power supply circuit of the power battery pack 301 and the corresponding power-consuming equipment 302;

[0103] The voltage platform of the power battery pack 301 is greater than a preset voltage;

[0104] The voltage conversion device 304 is arranged in part or all of the power supply circuit, and is used to convert the output voltage of the power battery pack 301 to supply power to the corresponding power-consuming device 302 . The output voltage of the voltage conversion device 304 is less than or equal to the preset voltage.

[0105] Specifically, electric vehicles are vehicles that use power batteries as energy sources, such as electric passenger cars, electric commercial vehicles, etc. Electric commercial vehicles include electric tractors, electric heavy trucks, etc.

[0106] It should be noted that the voltage conversion device 304 is disposed in part or all of the power supply circuit. Figure 3 The voltage conversion device 304 is merely provided in a part of the power supply circuit for example.

[0107] The following takes an electric tractor as an example to describe in detail the specific implementation process of the power supply method for an electric vehicle of the present invention. Figure 4 As shown, the electrical equipment 302 includes: a driving motor 401 , a battery heating film 402 , a steering oil pump 403 , an air pump 404 , a low-voltage battery 405 , an air-conditioning compressor 406 , a water cooling unit 407 and a water heater 408 .

[0108] The driving motor 401 is connected to the power battery pack 301 through the driving motor controller 409. The power battery pack 301 adopts an 800 volt voltage platform. The steering oil pump 403, the air pump 404, the low-voltage battery 405, the air conditioning compressor 406, the water cooling unit 407 and the water heater 408 are connected to the power battery pack 301 through the first DCDC voltage converter 410 and the all-in-one controller 411. The first DCDC voltage converter 410 converts the 800 volt voltage output by the power battery pack 301 into a 600 volt voltage to supply power to the steering oil pump 403, the air pump 404, the low-voltage battery 405, the air conditioning compressor 406, the water cooling unit 407 and the water heater 408. The battery heating film 402 is a resistor used to heat the power battery pack 301. Its input voltage is not limited (it can be powered by the power battery pack 301 or by the first DCDC voltage converter 410). The power battery pack 301 is charged via the charging port 412 , and the charging port 412 is used to connect a DC 800V charging device.

[0109] The negative electrode of the power battery pack 301 is connected to the negative electrode of the driving motor controller 409 , the negative electrode of the battery heating film 402 , the negative electrode of the 800V input terminal of the first DCDC voltage converter 410 , and the negative electrode of the charging port 412 through the first switch K1 . A second switch K2 and a first pre-charging branch connected in parallel are provided between the positive electrode of the power battery pack 301 and the positive electrode of the driving motor controller 409, and the first pre-charging branch includes a third switch K3 and a first pre-charging resistor R1 connected in series; a fifth switch K5 is provided between the positive electrode of the power battery pack 301 and the positive electrode of the battery heating film 402; a fourth switch K4 is provided between the positive electrode of the power battery pack 301 and the positive electrode of the 800V input port of the first DCDC voltage converter 410; a sixth switch K6 is provided between the positive electrode of the power battery pack 301 and the positive electrode of the charging port 412; a manual switch MSD is also provided at the positive electrode of the power battery pack 301 for manually controlling the electrical connection of the power battery pack 301; a shunt FL is also provided at the negative electrode of the power battery pack 301 for detecting the charging current and / or discharging current of the power battery pack 301.

[0110] The all-in-one controller 411 includes a second pre-charge branch, an eighth switch K8, a ninth switch K9, a tenth switch K10, a second DCDC voltage converter 413, a first DCAC (Direct Current-Alternating Current) voltage converter 414, a second DCAC voltage converter 415, a first fuse F1, a second fuse F2, a third fuse F3, a fourth fuse F4, a fifth fuse F5 and a sixth fuse F6; wherein the second pre-charge branch includes a seventh switch K7 and a second pre-charge resistor R2 connected in series. The positive pole of the input end of the second DCDC voltage converter 413 is connected to the positive pole of the 600 volt output end of the first DCDC voltage converter 410 through the first fuse F1, and the output end of the second DCDC voltage converter 413 is connected to the steering oil pump 403, which is used to convert the 600 volt voltage into a 24 volt voltage and then supply power to the steering oil pump 403; the positive pole of the input end of the first DCAC voltage converter 414 is connected to the positive pole of the 600 volt output end of the first DCDC voltage converter 410 through the second fuse F2, and the output end of the first DCAC voltage converter 414 is connected to the air pump 404, which is used to convert the DC voltage into an AC voltage and then supply power to the air pump 404; the positive pole of the input end of the second DCAC voltage converter 415 is connected to the positive pole of the 600 volt output end of the first DCDC voltage converter 410 through the third fuse F3, and the output end of the second DCAC voltage converter 415 is connected to the low-voltage battery 405, which is used to convert the DC voltage into an AC voltage. After the voltage is compressed, the low-voltage battery 405 is powered; the eighth switch K8 is connected in series with the sixth fuse F6 and is arranged between the positive electrode of the 600-volt output end of the first DCDC voltage converter 410 and the positive electrode of the air-conditioning compressor 406, and the second pre-charging branch is connected in parallel with the eighth switch K8; the ninth switch K9 is connected in series with the fourth fuse F4 and is arranged between the positive electrode of the 600-volt output end of the first DCDC voltage converter 410 and the positive electrode of the water-cooling unit 407; the tenth switch K10 is connected in series with the fifth fuse F5 and is arranged between the positive electrode of the 600-volt output end of the first DCDC voltage converter 410 and the positive electrode of the water-heating heater 408; the negative electrode of the 600-volt output end of the first DCDC voltage converter 410 is respectively connected to the negative electrode of the second DCDC voltage converter 413, the negative electrode of the first DCAC voltage converter 414, the negative electrode of the second DCAC voltage converter 415, the negative electrode of the air-conditioning compressor 406, the negative electrode of the water-cooling unit 407 and the negative electrode of the water-heating heater 408.

[0111] like Figure 5As shown, the power supply system also includes a control device 305, which is electrically connected to the first switch K1 to the tenth switch K10 through a control line and a detection line, and the control device 305 is electrically connected to the shunt FL through a detection line; the control device 305 is connected to the driving motor controller 409, the all-in-one controller 411, the air conditioning compressor 406, the water cooling unit 407, the water heater 408, the charging port 412, the power battery pack 301, the first DCDC voltage converter 410 and the vehicle controller 501 through a CAN bus. Among them, Figure 5 The dashed line represents the detection line, the single solid line represents the control line, and the double solid line represents the CAN bus.

[0112] The power supply process includes:

[0113] The control device 305 detects the high-voltage power-on request through the CAN bus and performs self-inspection. If there is no abnormality, the first switch K1 and the fourth switch K4 are closed, and the all-in-one controller 411 connects the high-voltage power to supply power to the steering oil pump 403, the air pump 404 and the low-voltage battery 405.

[0114] The control device 305 detects the driving request (the key is turned to the START position) through the CAN bus, first closes the third switch K3, and charges the driving motor controller 409 through the first pre-charging resistor R1. When the bus voltage of the driving motor controller 409 meets the requirement, the pre-charging is completed, the second switch K2 is closed and the third switch K3 is opened, and the driving motor 401 can work according to the gear position and throttle position information of the electric vehicle.

[0115] According to the user's operation signal, the ninth switch K9 can be closed to power the water cooling unit 407, the tenth switch K10 can be closed to power the water heater 408, the fifth switch K5 can be closed to power the battery heating film 402, and the seventh switch K7 can be closed to pre-charge the air-conditioning compressor 406 through the second pre-charging resistor R2. When the bus voltage of the air-conditioning compressor 406 meets the requirements, the pre-charging is completed, the eighth switch K8 is closed, and the seventh switch K7 is opened.

[0116] During the power supply process, the message signals of the driving motor controller 409, the all-in-one controller 411, the air conditioning compressor 406, the water cooling unit 407, the water heater 408, the charging port 412, the power battery pack 301, the first DCDC voltage converter 410 and the vehicle controller 501 are collected through the CAN bus to detect and display the status signals of the relevant power-consuming equipment 302 and determine whether charging is required. At the same time, the discharge current of the power battery pack 301 is detected through the shunt FL to disconnect the corresponding switch or give an early warning when the discharge current is abnormal.

[0117] The charging process includes:

[0118] When the control device 305 determines to establish a communication connection with the charging device, it sends a charging request instruction to the charging device connected to the charging port 412; the charging device feeds back the voltage to be charged to the control device 305, and the control device 305 compares the voltage to be charged fed back by the charging device connected to the charging port 412 with the requested charging voltage. If the two match, the first switch K1 and the sixth switch K6 are closed to charge the power battery pack 301 to prevent damage to the power battery pack 301 or influence on the charging efficiency due to inconsistent charging voltage.

[0119] During the charging process, the charging current of the power battery pack 301 is also detected through the shunt FL to prevent the abnormal charging current from damaging the power battery pack 301 or affecting the charging efficiency.

[0120] Figure 6 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 6 As shown, the electronic device may include: a processor (processor) 601, a communication interface (Communications Interface) 602, a memory (memory) 603 and a communication bus 604, wherein the processor 601, the communication interface 602, and the memory 603 communicate with each other through the communication bus 604. The processor 601 may call the logic instructions in the memory 603 to execute the power supply method of the electric vehicle, the method comprising: obtaining an operation signal of the electric vehicle;

[0121] A first control instruction is generated based on the operation signal, and the first control instruction is sent to the corresponding first switch device; the first control instruction is used to control the closing or opening of the first switch device, and the closing or opening of the first switch device is used to control the connection or disconnection of the power supply circuit between the power battery pack and the corresponding electrical equipment; wherein, the voltage platform of the power battery pack is greater than a preset voltage, and a voltage conversion device is provided in part or all of the power supply circuit, and the voltage conversion device is used to convert the output voltage of the power battery pack to supply power to the corresponding electrical equipment, and the output voltage of the voltage conversion device is less than or equal to the preset voltage.

[0122] In addition, the logic instructions in the above-mentioned memory 603 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0123] On the other hand, the present invention further provides a computer program product, the computer program product includes a computer program, the computer program can be stored in a non-transitory computer-readable storage medium, when the computer program is executed by a processor, the computer can execute the power supply method of the electric vehicle provided by the above methods, the method includes: obtaining an operation signal of the electric vehicle;

[0124] A first control instruction is generated based on the operation signal, and the first control instruction is sent to the corresponding first switch device; the first control instruction is used to control the closing or opening of the first switch device, and the closing or opening of the first switch device is used to control the connection or disconnection of the power supply circuit between the power battery pack and the corresponding electrical equipment; wherein, the voltage platform of the power battery pack is greater than a preset voltage, and a voltage conversion device is provided in part or all of the power supply circuit, and the voltage conversion device is used to convert the output voltage of the power battery pack to supply power to the corresponding electrical equipment, and the output voltage of the voltage conversion device is less than or equal to the preset voltage.

[0125] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to execute the power supply method for an electric vehicle provided by the above methods, the method comprising: obtaining an operation signal of the electric vehicle;

[0126] A first control instruction is generated based on the operation signal, and the first control instruction is sent to the corresponding first switch device; the first control instruction is used to control the closing or opening of the first switch device, and the closing or opening of the first switch device is used to control the connection or disconnection of the power supply circuit between the power battery pack and the corresponding electrical equipment; wherein, the voltage platform of the power battery pack is greater than a preset voltage, and a voltage conversion device is provided in part or all of the power supply circuit, and the voltage conversion device is used to convert the output voltage of the power battery pack to supply power to the corresponding electrical equipment, and the output voltage of the voltage conversion device is less than or equal to the preset voltage.

[0127] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0128] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for 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 some parts of the embodiments.

[0129] 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 embodiments of the present invention.

Claims

1. A method for supplying power to an electric vehicle, characterized in that: include: Acquiring an operation signal of an electric vehicle; generating a first control instruction based on the operation signal, and sending the first control instruction to a corresponding first switch device; The first control instruction is used to control the closing or opening of the first switch device, and the closing or opening of the first switch device is used to control the connection or disconnection of the power supply circuit between the power battery pack and the corresponding electrical equipment; wherein the voltage platform of the power battery pack is greater than the preset voltage, and a voltage conversion device is provided in part or all of the power supply circuits, and the voltage conversion device is used to convert the output voltage of the power battery pack to supply power to the corresponding electrical equipment, and the output voltage of the voltage conversion device is less than or equal to the preset voltage; The electrical equipment includes low-voltage equipment, or the low-voltage equipment and high-voltage equipment; Wherein, the voltage platform of the low-voltage device is less than or equal to the preset voltage, the voltage conversion device is provided in the power supply circuit corresponding to the low-voltage device, and the output voltage of the voltage conversion transposition is the same as the voltage platform of the low-voltage device; The voltage platform of the high-voltage device is the same as the voltage platform of the power battery pack, and the voltage conversion device is not provided in the power supply circuit corresponding to the high-voltage device.

2. The method for powering an electric vehicle according to claim 1, characterized in that: The power battery pack is charged through the following steps: When it is determined to establish a communication connection with the charging device, a charging request instruction is sent to the charging device; wherein the charging request instruction includes a requested charging voltage corresponding to the power battery pack; receiving a charging voltage fed back by the charging device; When it is determined that the voltage to be charged is consistent with the requested charging voltage, a second control instruction is generated and sent to the charging control switch; the second control instruction is used to control the closing of the charging control switch, and the closing or opening of the charging control switch is used to control the connection or disconnection of the charging circuit of the power battery pack.

3. The method for powering an electric vehicle according to claim 2, characterized in that: Also includes: Sending a detection instruction to each of the first switch devices and / or the charging control switch; Based on a feedback signal of the first switching device and / or the charging control switch, a fault detection result of the first switching device and / or the charging control switch is determined.

4. The method for powering an electric vehicle according to claim 1, characterized in that: The generating a first control instruction based on the operation signal and sending the first control instruction to the corresponding first switch device includes: When it is determined that the electrical device needs to be pre-charged, a pre-charging instruction is generated based on the operation signal, and the pre-charging instruction is sent to a second switch device of a pre-charging circuit of the electrical device, wherein the pre-charging instruction is used to control the closing of the second switch device; wherein the closing or opening of the second switch device is used to control the connection or disconnection of the pre-charging circuit; When it is determined that the pre-charging of the electrical equipment is completed, a pre-charging end instruction and the first control instruction are generated, and the pre-charging end instruction is sent to the second switching device, and the first control instruction is sent to the corresponding first switching device. The pre-charging end instruction is used to control the second switching device to disconnect.

5. A power supply device for implementing the power supply method for an electric vehicle according to any one of claims 1 to 4, characterized in that: include: A data acquisition module, used for acquiring an operation signal of the electric vehicle; a calculation module, configured to generate a first control instruction based on the operation signal, and send the first control instruction to a corresponding first switch device; The first control instruction is used to control the closing or opening of the first switching device, and the closing or opening of the first switching device is used to control the connection or disconnection of the power supply circuit between the power battery pack and the corresponding electrical equipment; wherein, the voltage platform of the power battery pack is greater than a preset voltage, and a voltage conversion device is provided in part or all of the power supply circuit, and the voltage conversion device is used to convert the output voltage of the power battery pack to supply power to the corresponding electrical equipment, and the output voltage of the voltage conversion device is less than or equal to the preset voltage.

6. An electric vehicle, characterized in that: include: Power battery pack, electrical equipment, first switch device, voltage conversion device and control device; The control device is used to obtain an operation signal of the electric vehicle; It is also used to generate a first control instruction based on the operation signal, and send the first control instruction to the corresponding first switch device; the first control instruction is used to control the closing or opening of the first switch device, and the closing or opening of the first switch device is used to control the connection or disconnection of the power supply circuit of the power battery pack and the corresponding electrical equipment; The voltage platform of the power battery pack is greater than a preset voltage; The voltage conversion device is arranged in part or all of the power supply circuit, and is used to convert the output voltage of the power battery pack to supply power to the corresponding power-consuming equipment, and the output voltage of the voltage conversion device is less than or equal to the preset voltage; The electrical equipment includes low-voltage equipment, or the low-voltage equipment and high-voltage equipment; Wherein, the voltage platform of the low-voltage device is less than or equal to the preset voltage, the voltage conversion device is provided in the power supply circuit corresponding to the low-voltage device, and the output voltage of the voltage conversion transposition is the same as the voltage platform of the low-voltage device; The voltage platform of the high-voltage device is the same as the voltage platform of the power battery pack, and the voltage conversion device is not provided in the power supply circuit corresponding to the high-voltage device.

7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the method for powering an electric vehicle according to any one of claims 1 to 4 is implemented.

8. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for powering an electric vehicle according to any one of claims 1 to 4 is implemented.

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