WO2020057307A1

WO2020057307A1 - Electric vehicle and power supply method for electric vehicle

Info

Publication number: WO2020057307A1
Application number: PCT/CN2019/101482
Authority: WO
Inventors: 刘慧斌; 吴义华; 李林; 高春果; 安康
Original assignee: 爱驰汽车有限公司
Priority date: 2018-09-18
Filing date: 2019-08-20
Publication date: 2020-03-26

Abstract

An electric vehicle and a power supply method for an electric vehicle. The electric vehicle comprises that: a first battery pack is connected to a vehicle-mounted charger (3); a mounting groove (1) is formed on a vehicle frame (5) under a trunk floor (4) of a trunk of the electric vehicle; and a second battery pack (2) is detachably arranged in the mounting groove (1), the second battery pack (2) at least comprising that: a battery pack casing (21) is detachably connected to the mounting groove (1); a terminal block (22) is connected to a bottom part of the battery pack casing (21); a battery cell (23) is connected to the terminal block (22); a first end of two high-voltage wiring harnesses (24) is connected to the vehicle-mounted charger (3), and a second end thereof traverses the mounting groove (1) and the battery pack casing (21) to electrically connect to the terminal block (22); the vehicle-mounted charger (3) monitors in real time motor required power of a vehicle-mounted motor and output power of the first battery pack and the second battery pack (2), and selects at least one of the first battery pack and the second battery pack (2) to supply power to the vehicle-mounted motor. The present solution not only increases the cruising range, but also reduces the difficulty of battery replacement by means of a local replacement means. There is thus no need to go to battery swapping stations, which greatly saves the time of the user.

Description

Electric vehicle and power supply method of electric vehicle

Technical field

The invention relates to the field of electric vehicle charging, and in particular, to an electric vehicle and a power supply method for an electric vehicle.

Background technique

As people become more aware of environmental protection, environmental pollution and resource issues are receiving great attention. The energy-saving and emission-reduction situation in the automotive industry is becoming increasingly severe. The development of energy-saving and environmentally-friendly vehicles has become an inevitable choice for the development of the automotive industry. At present, new energy-saving and environmentally-friendly vehicles represented by electric energy as end-use products for the power and energy storage battery industry have become emerging strategic industries encouraged by the state. Auxiliary, centralized charging, unified distribution, through the integration of the 'three networks' technology of the smart grid, the Internet of Things and the transportation network, the implementation of information, automation and networked 'three networks' management to achieve full coverage of electric vehicle users across regions The same network, the same quality and the same price of the "three identical" service "construction policy. The charging and replacement of the electric vehicle's storage battery is related to the popularity and promotion of the entire electric vehicle industry. The use of specialized battery replacement equipment to fully replace the exhausted battery pack of an electric vehicle with a fully-charged battery pack in a charging station without any attendance is the technical development direction of an electric vehicle charging station.

Rechargeable batteries can be replaced by manual or mechanical equipment. Each battery box weighs about 80 kilograms. If the manual labor is quite strong and there are great safety risks, it is not suitable for modern production procedures. Only mechanical equipment can be used. This will not only improve efficiency, but also ensure the safety of operating workers. It is a widely used method in modern industry and an important direction to improve the level of new energy utilization and technological content.

In the early days, the replacement of electric vehicle batteries was basically implemented by means of manual auxiliary machines. Although manual participation increases the flexibility of battery replacement, it also increases labor costs and reduces the efficiency of battery replacement. In addition, due to the weight of a single battery, this increases the labor intensity of workers and the danger of changing electricity. The use of automatic equipment not only improves the efficiency, but also ensures the safety of the operator. Therefore, the research can quickly replace the battery and improve the battery. Replacing efficient automatic equipment is particularly important.

Most of the batteries of current electric vehicles with the power exchange function are installed on the bottom of the vehicle as a whole. To change the power, the entire battery module must be replaced. Moreover, because the overall weight of the battery module is very large and the installation is complicated, it is necessary to replace the battery Going to a professional power station cannot be replaced by the user. The time is slow, the cycle is long, and it is not suitable for the application scenarios of urban households. And just seeing the battery set on the bottom of the car, the space inside the car is not fully utilized.

Summary of the Invention

In view of the problems in the prior art, an object of the present invention is to provide an electric vehicle and a power supply method for an electric vehicle. One of the battery packs can be detachably installed in a trunk through the installation of multiple battery packs, and the vehicle body can be fully utilized. The internal space increases the cruising range of the electric vehicle and solves the mileage anxiety of the user. At the same time, the user can replace the battery in the trunk separately. The local replacement method can reduce the difficulty of power replacement. Application scenarios for urban home use.

An embodiment of the present invention provides an electric vehicle, including:

A first battery pack, the first battery pack is connected to a car charger;

A mounting slot, the mounting slot being formed under a trunk floor of the trunk of the electric vehicle;

A second battery pack is detachably disposed in the mounting slot, and the second battery pack includes at least:

A battery pack shell, the battery pack shell is detachably connected to the mounting groove;

A wiring board connected to the bottom of the battery pack housing;

At least one battery cell, each of which is connected to the terminal board; and

Two high-voltage wiring harnesses, a first end of the high-voltage wiring harness is connected to the on-board charger, and a second end of the high-voltage wiring harness passes through the mounting groove and the battery pack housing, and is electrically connected to the wiring board;

The on-board charger monitors the motor required power of the on-board motor, the output power of the first battery pack and the second battery pack in real time, and selects at least one of the first battery pack and the second battery pack to the vehicle. Motor powered.

Preferably, it further comprises: a sealing plate, the sealing plate is provided with screw holes and via holes, the mounting groove is provided with screw holes and via holes, and the sealing plate is screwed into the mounting groove via holes , The high-voltage wiring harness passes through a through hole of the sealing plate.

Preferably, it further comprises: a gasket is provided around the screw connection hole and the via hole of the sealing plate, and the sealing plate is in contact with the gasket.

Preferably, it further comprises: a sealing plug, wherein the sealing plug is provided with screw holes and via holes; the battery pack housing is provided with screw holes and via holes; and the sealing plug is screwed to the battery pack shell Body vias, the high-voltage wiring harness passes through the sealed and blocked vias into the battery pack housing.

Preferably, the second battery pack further includes: a separator provided in the battery pack case in a horizontal direction, and the wiring board is provided on a lower surface of the separator and the battery pack case. In between, the upper surface of the separator supports the battery cell, the terminal of the wiring board is exposed on the separator, and the battery cell is electrically connected to the terminal.

Preferably, a spare tire is provided in the trunk of the electric vehicle, and the mounting groove is formed in a space in the center of the spare tire.

Preferably, a first storage box is provided in the trunk of the electric vehicle, and the first storage box is disposed between a trunk floor of the trunk of the electric vehicle and the frame. The box is on the same layer as the second battery pack, and the first storage box is located on a side far from the exit of the trunk of the electric vehicle, and the second battery pack is located on a side close to the exit of the trunk of the electric vehicle.

Preferably, it further includes: a second storage box, the shape and size of the second storage box are the same as the second battery pack, and the second storage box replaces the second battery pack, and Mounted in the mounting slot.

Preferably, the second battery pack further includes a low-voltage wiring harness, a first end of the low-voltage wiring harness is connected to the vehicle charger, a second end passes through the mounting slot and the battery pack housing, and is electrically connected to the battery pack. Said wiring board, said high-voltage wiring harness and low-voltage wiring harness are respectively connected to both sides of said wiring board.

Preferably, the voltage of the high-voltage wiring harness is 350V;

The voltage of the low-voltage wiring harness is 12V.

An embodiment of the present invention also provides a power supply method for an electric vehicle. The above-mentioned electric vehicle includes the following steps:

S101. The on-board charger monitors the motor required power of the on-board motor and the maximum output power of the first battery pack and the second battery pack in real time;

S102. When the required power of the motor is less than or equal to the maximum output power of the second battery pack, the second battery pack separately supplies power to the on-board motor;

S103. When the required power of the motor is greater than the maximum output power of the second battery pack, the first battery pack separately supplies power to the on-board motor.

An embodiment of the present invention also provides another power supply method for an electric vehicle. The above-mentioned electric vehicle includes the following steps:

S201. The on-board charger monitors the motor required power of the on-board motor and the maximum output power of the first battery pack and the second battery pack in real time;

S202. When the required power of the motor is less than or equal to the maximum output power of the second battery pack, the second battery pack separately supplies power to the on-board motor;

S203. When the required power of the motor is greater than the maximum output power of the second battery pack, the second battery pack provides the maximum output power to the on-board motor, and the first battery pack provides the on-board motor. The difference power between the required power of the motor and the maximum output power of the second battery pack.

The purpose of the present invention is to provide an electric vehicle and a method for powering the electric vehicle, which can make fuller use of the internal space of the vehicle body, increase the cruising range of the electric vehicle, and solve the mileage anxiety of the user. Purchase cost. For the entire vehicle, users can replace some battery packs without having to go to the power station. This makes the use of electric vehicles more flexible, greatly alleviates the endurance pressure, and is more suitable for urban household applications.

BRIEF DESCRIPTION OF THE DRAWINGS

Other features, objects, and advantages of the present invention will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings.

FIG. 1 is a schematic diagram of a partial frame of a trunk of an electric vehicle according to the present invention.

FIG. 2 is a plan view of a portion of a trunk frame of an electric vehicle according to the present invention.

3 is a schematic diagram of a combination of a second battery pack and a frame of an electric vehicle according to the present invention.

FIG. 4 is a schematic diagram of a cable direction of an electric vehicle according to the present invention.

5 is a sectional view of a second battery pack and a frame of an electric vehicle according to the present invention.

6 is a schematic diagram of a second battery and a high-voltage line of an electric vehicle according to the present invention.

7 is a schematic diagram of a high-voltage line and a frame of an electric vehicle according to the present invention.

8 is a schematic diagram of a sealing plate and a sealing block on a high-voltage line of an electric vehicle according to the present invention.

9 is a schematic diagram of a combination of a second battery and a first foamed storage box of an electric vehicle according to the present invention.

FIG. 10 is a schematic diagram after the trunk floor is removed in FIG. 9.

11 is a schematic diagram of a combination of a first foamed storage box and a second foamed storage box of an electric vehicle according to the present invention.

FIG. 12 is a flowchart of a power supply method for an electric vehicle according to the present invention. as well as

13 is a flowchart of another power supply method for an electric vehicle according to the present invention.

Reference sign

1 installation slot

2 Second battery pack

21 battery case

22 terminal block

23 battery cell

24 High-voltage wiring harness

25 sealing plate

26 Seal gaskets

27 Sealed and blocked

28 barriers

29 low-voltage wiring harness

3 car charger

4 luggage floor

5 frame

6 First foam storage box

7 Second foam storage box

8 high-voltage wiring harness

9 First battery installation department

detailed description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and their repeated description will be omitted.

FIG. 1 is a schematic diagram of a partial frame of a trunk of an electric vehicle according to the present invention. FIG. 2 is a plan view of a portion of a trunk frame of an electric vehicle according to the present invention. 3 is a schematic diagram of a combination of a second battery pack and a frame of an electric vehicle according to the present invention. FIG. 4 is a schematic diagram of a cable direction of an electric vehicle according to the present invention. 5 is a sectional view of a second battery pack and a frame of an electric vehicle according to the present invention. 6 is a schematic diagram of a second battery and a high-voltage line of an electric vehicle according to the present invention. 7 is a schematic diagram of a high-voltage line and a frame of an electric vehicle according to the present invention. FIG. 8 is a schematic diagram of a sealing plate and a sealing plug on a high-voltage line of an electric vehicle according to the present invention. As shown in FIGS. 1 to 8, an embodiment of the present invention provides an electric vehicle, which includes: a first battery pack, a mounting slot 1, a second battery pack 2, and a car charger 3. It is arranged on the bottom of the electric vehicle, and the first battery pack is connected to a car charger 3, but it is not limited to this. The second battery pack is disposed in the mounting slot 1 of the trunk of the electric vehicle. The mounting slot 1 is formed in the frame 5 under the trunk floor 4 of the trunk of the electric vehicle. The second battery pack 2 is detachably disposed in the mounting slot. 1 in. The second battery pack 2 includes at least: the battery pack housing 21 is detachably connected to the installation groove 1. In this embodiment, in order to enhance the connection strength, the battery pack housing 21 is detachably screwed to the installation groove 1, but not This is the limit. The terminal board 22 is connected to the bottom of the battery pack casing 21. In this embodiment, in order to enhance the connection strength, the terminal board 22 is screwed to the bottom of the battery pack casing 21 but is not limited thereto. A plurality of battery cells 23 are connected to the wiring board 22, respectively. The first ends of the two high-voltage wiring harnesses 24 are connected to the vehicle charger 3, and the second ends of the two high-voltage harnesses 24 pass through the mounting slot 1 and the battery pack housing 21, and are electrically connected to the wiring board 22. The second battery pack 2 in the present invention is disposed under the trunk floor 4 of the trunk of an electric vehicle. The second battery pack 2 can be exposed by opening the trunk and opening the trunk floor 4 so as to expose the second battery pack. 2 Perform replacement of a single battery cell 23, or replace another second battery pack 2 as a whole.

The vehicle charger 3 monitors the motor required power of the vehicle motor, the output power of the first battery pack and the second battery pack 2 in real time, and selects at least one of the first battery pack and the second battery pack 2 to supply power to the vehicle electric motor. The in-vehicle charger 3 is also connected to a first battery (not shown in the figure) mounted on the first battery mounting portion 9 through a high-voltage wire harness 8. The on-board charger 3 can make more reasonable use according to the actual power of the first battery pack and the second battery pack 2 and preferentially use the electric energy in the easily replaceable second battery pack 2 while keeping the first battery pack that is not easy to replace as much as possible. Of electrical energy.

In a preferred solution, the method further includes: the sealing plate 25 is provided with screw holes and via holes, the installation groove 1 is provided with screw holes and via holes, the sealing plate 25 is screwed into the installation hole 1 through holes, and the high-voltage wiring harness 24 is passed through A gasket 26 is provided around the via hole of the sealing plate 25, the screw connection hole of the sealing plate 25 and the via hole, and the sealing plate 25 is in contact with the gasket 26. In this way, the fixing effect of the mounting groove 1 on the high-voltage wiring harness 24 and the sealing effect of the internal space are ensured.

In a preferred solution, the method further includes: the sealing plug 27 is provided with screw holes and via holes, the battery pack housing 21 is provided with screw holes and via holes, and the sealing plug 27 is screwed with the via holes of the battery pack housing 21, The high-voltage wiring harness 24 passes through the through hole of the sealing plug 27 and enters the battery pack case 21. In this way, the fixing effect of the battery pack housing 21 on the high-voltage wiring harness 24 and the sealing effect of the internal space are ensured.

In a preferred solution, the second battery pack 2 further includes: a separator 28 disposed in the battery pack case 21 in a horizontal direction, and the wiring board 22 provided on the lower surface of the separator 28 and the battery pack case 21. Meanwhile, the upper surface of the separator 28 supports the battery cell 23, the connection terminals of the wiring board 22 are exposed on the separator 28, and the battery cell 23 is electrically connected to the connection terminals. The separator 28 can play the role of heat insulation and fire prevention, and effectively avoids the influence and destruction of a large amount of heat generated by the battery cells 23 in use on the circuit portion of the wiring board 22.

In a preferred solution, the trunk of the electric vehicle is provided with a spare tire, and the mounting groove 1 is formed in the space in the center of the spare tire. Therefore, the space in the trunk is further utilized. A second battery pack 2 is disposed in the installation slot 1. Let the second battery pack 2 occupy the circular space in the center of the spare tire, make full use of the trunk space, enhance battery life, and ensure that some battery packs can be easily removed and replaced.

9 is a schematic diagram of a combination of a second battery and a first foamed storage box of an electric vehicle according to the present invention. FIG. 10 is a schematic diagram after the trunk floor is removed in FIG. 9. As shown in FIGS. 9 and 10, in this embodiment, a first foamed storage box 6 is used as the first storage box, and a second foamed storage box 7 is used as the second storage box. The trunk of the electric vehicle is provided with a first foamed storage box 6. The first foamed storage box 6 is disposed between the trunk floor 4 and the frame 5 of the trunk of the electric vehicle. The first foamed storage box 6 and The second battery pack 2 is on the same layer, and the first foam storage box 6 is located on the side away from the exit of the trunk of the electric vehicle. The second battery pack 2 is located on the side close to the exit of the trunk of the electric vehicle, which is convenient for the user to replace the second battery. Package 2.

11 is a schematic diagram of a combination of a first foamed storage box and a second foamed storage box of an electric vehicle according to the present invention. As shown in FIG. 11, the present invention further includes: a second foamed storage box 7, the shape and size of the second foamed storage box 7 are the same as those of the second battery pack 2, and the second foamed storage box 7 The second battery pack 2 is replaced and installed in the mounting groove 1. The present invention can also increase the storage space in the car by removing the second battery pack 2 and replacing the second foam storage box 7.

In a preferred solution, the second battery pack 2 further includes a low-voltage wiring harness 29. The first end of the low-voltage wiring harness 29 is connected to the vehicle charger 3, the second end passes through the mounting slot 1 and the battery pack housing 21, and is electrically connected to the terminal board 22, the high-voltage wiring harness 24 and the low-voltage wiring harness 29 are respectively connected to both sides of the wiring board 22.

In a preferred solution, the voltage of the high-voltage wiring harness 24 is 350V; the voltage of the low-voltage wiring harness is 12V.

The invention can make fuller use of the internal space of the vehicle body, increase the cruising range of the electric vehicle, solve the user's mileage anxiety, and can quickly replace the new battery pack through the trunk of the car, reducing the use and purchase costs. For the entire vehicle, users can replace some battery packs without having to go to the power station. This makes the use of electric vehicles more flexible, greatly alleviates the endurance pressure, and is more suitable for urban household applications.

FIG. 12 is a flowchart of a power supply method for an electric vehicle according to the present invention. As shown in FIG. 12, the present invention also provides a power supply method for an electric vehicle. The above-mentioned electric vehicle includes the following steps:

S101. The vehicle charger monitors the motor required power of the vehicle motor and the maximum output power of the first battery pack and the second battery pack in real time;

The above-mentioned electric vehicle power supply method of the present invention can make more reasonable use according to the actual power of the first battery pack and the second battery pack 2 and preferentially use the electric energy in the easily replaceable second battery pack 2 while keeping it as easy as possible The electric power of the first battery pack makes full use of the convenience that users can replace some battery packs on their own, making the use of electric vehicles more flexible, greatly alleviating the endurance pressure, and more suitable for the application scenarios of urban households.

13 is a flowchart of another power supply method for an electric vehicle according to the present invention. As shown in FIG. 13, the present invention also provides another power supply method for an electric vehicle. The above-mentioned electric vehicle includes the following steps:

S201. The vehicle charger monitors the motor required power of the vehicle motor and the maximum output power of the first battery pack and the second battery pack in real time;

S203. When the required power of the motor is greater than the maximum output power of the second battery pack, the second battery pack provides the maximum output power to the on-board motor, and the first battery pack provides the on-board motor with the power required by the motor and the maximum output power of the second battery pack. Difference power.

Similarly, the above-mentioned electric vehicle power supply method of the present invention can make more reasonable use according to the actual power of the first battery pack and the second battery pack 2 and preferentially use the electric energy in the easily replaceable second battery pack 2 while maintaining as much as possible The electrical energy of the first battery pack that is not easy to replace, fully utilizes the convenience that users can replace some battery packs on their own, making the use of electric vehicles more flexible, greatly reducing the pressure of endurance, and more suitable for urban home application scenarios.

In summary, the purpose of the present invention is to provide an electric vehicle and an electric vehicle power supply method, which can make fuller use of the interior space of the vehicle body, increase the cruising range of the electric vehicle, solve the mileage anxiety of the user, and can quickly replace the new battery pack through the trunk of the car. , Reduce use and purchase costs. For the entire vehicle, users can replace some battery packs without having to go to the power station. This makes the use of electric vehicles more flexible, greatly alleviates the endurance pressure, and is more suitable for urban household applications.

The above is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without deviating from the concept of the present invention, several simple deductions or replacements can be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

An electric vehicle, comprising:

A first battery pack, the first battery pack is connected to a car charger (3);

A mounting groove (1), the mounting groove (1) is formed on the frame (5) under the trunk floor (4) of the trunk of the electric vehicle;

A second battery pack (2) is detachably disposed in the mounting slot (1), and the second battery pack (2) includes at least:

A battery pack shell (21), the battery pack shell (21) is detachably connected to the mounting groove (1);

A terminal board (22), which is connected to the bottom of the battery pack casing (21);

At least one battery cell (23), said battery cells (23) being respectively connected to said wiring board (22); and

Two high-voltage wiring harnesses (24), a first end of the high-voltage wiring harness (24) is connected to the vehicle charger (3), and a second end passes through the mounting groove (1) and the battery pack housing (21) ), Electrically connecting the wiring board (22);

The vehicle charger (3) monitors the motor required power of the vehicle motor, the output power of the first battery pack and the second battery pack (2) in real time, and selects the first battery pack and the second battery pack At least one of (2) supplies power to the on-board motor.
The electric vehicle according to claim 1, further comprising: a sealing plate (25), the sealing plate (25) is provided with screw holes and via holes, and the mounting groove (1) is provided with a screw A connection hole and a through hole, the sealing plate (25) is screwed into the mounting hole (1) through hole, and the high voltage wire harness (24) passes through the through hole of the sealing plate (25).
The electric vehicle according to claim 2, further comprising: a gasket (26) is provided around a screw connection hole and a via hole of the sealing plate (25), and the sealing plate (25) and Said gasket (26) abuts.
The electric vehicle according to claim 1, further comprising: a sealing plug (27), wherein the sealing plug (27) is provided with screw holes and via holes, and the battery pack housing (21) is provided with There are screw holes and vias, the sealing plug (27) is screwed to the via of the battery pack housing (21), and the high-voltage wiring harness (24) passes through the via of the sealing plug (27) Enter the battery pack housing (21).
The electric vehicle according to claim 1, characterized in that the second battery pack (2) further comprises: a partition plate (28) disposed in the battery pack housing (21) in a horizontal direction, The wiring board (22) is disposed between the lower surface of the separator (28) and the battery pack case (21), and the upper surface of the separator (28) supports the battery cell (23) The terminal of the terminal board (22) is exposed on the separator (28), and the battery cell (23) is electrically connected to the terminal.
The electric vehicle according to claim 1, wherein the trunk of the electric vehicle is provided with a spare tire, and the mounting groove (1) is formed in a space in the center of the spare tire.
The electric vehicle according to claim 1, wherein the trunk of the electric vehicle is provided with a first storage box (6), and the first storage box (6) is provided in the trunk of the electric vehicle. Between the trunk floor (4) and the frame (5), the first storage box (6) and the second battery pack (2) are on the same level, and the first storage box (6) is located The side far from the exit of the trunk of the electric vehicle, the second battery pack (2) is located on the side close to the exit of the trunk of the electric vehicle.
The electric vehicle according to any one of claims 1 to 7, further comprising: a second storage box (7), and the shape and size of the second storage box (7) are in accordance with The second battery pack (2) is the same, and the second storage box (7) replaces the second battery pack (2) and is installed in the mounting groove (1).
The electric vehicle according to any one of claims 1 to 7, wherein the second battery pack (2) further comprises a low-voltage wiring harness (29), and the first end of the low-voltage wiring harness (29) is connected The second end of the vehicle charger (3) passes through the mounting groove (1) and the battery pack housing (21), and is electrically connected to the terminal board (22), the high-voltage wiring harness (24), and The low-voltage wiring harness (29) is respectively connected to both sides of the wiring board (22).
The electric vehicle according to claim 9, characterized in that the voltage of the high-voltage wiring harness (24) is 350V;

The voltage of the low-voltage wiring harness is 12V.
A power supply method for an electric vehicle, characterized in that the electric vehicle according to any one of claims 1 to 10 is used, comprising the following steps:

S101. The on-board charger monitors the motor required power of the on-board motor and the maximum output power of the first battery pack and the second battery pack in real time;

S102. When the required power of the motor is less than or equal to the maximum output power of the second battery pack, the second battery pack separately supplies power to the on-board motor;

S103. When the required power of the motor is greater than the maximum output power of the second battery pack, the first battery pack separately supplies power to the on-board motor.
A power supply method for an electric vehicle, characterized in that the electric vehicle according to any one of claims 1 to 10 is used, comprising the following steps:

S201. The on-board charger monitors the motor required power of the on-board motor and the maximum output power of the first battery pack and the second battery pack in real time;

S202. When the required power of the motor is less than or equal to the maximum output power of the second battery pack, the second battery pack separately supplies power to the on-board motor;

S203. When the required power of the motor is greater than the maximum output power of the second battery pack, the second battery pack provides the maximum output power to the on-board motor, and the first battery pack provides the on-board motor. The difference power between the required power of the motor and the maximum output power of the second battery pack.