Charging control method and system for pure electric light truck

Abstract

The invention discloses a charging control method and system for a pure electric light truck. The method comprises the steps that a double-charging CAN loop, a main charging loop and an auxiliary charging loop are arranged in a vehicle power battery management system BMS, wherein the main charging loop and the auxiliary charging loop correspond to the double-charging CAN loop; a main charging socket and an auxiliary charging socket are arranged, the main charging gun is directly and electrically connected with the power battery module through the main charging socket to form a main charging loop, and the auxiliary charging gun is electrically connected with the all-in-one control box through the auxiliary charging socket to form an auxiliary charging loop; when the charging guns are inserted into the charging pile, the battery management system identifies gun insertion signals of the main charging guns and the auxiliary charging guns according to CC signals, and then a single-gun charging mode or a double-gun charging mode is determined; and awakening a battery management system BMS and a vehicle control unit VCU according to the duty ratio of a CP signal sent by the charging pile, and performing charging current distribution control according to a single-gun charging mode or a double-gun charging mode. The charging efficiency of the vehicle can be improved, and the requirement for ultrafast charging of the vehicle is met.

Description

Technical Field

[0001] The present invention relates to the technical field of light truck charging control, and more specifically, to a charging control method and system for a pure electric light truck. Background Art

[0002] The energy replenishment efficiency of new energy vehicles has always been an important bottleneck restricting their replacement of fuel vehicles. For this reason, different technical routes have been implemented, such as the battery replacement technology route, which can achieve 3 minutes of full charge, close to the energy replenishment efficiency of fuel vehicles, but the actual operation cost is too high. Another is the super fast charging strategy, but there are still some problems in the industrialization of existing solid-state batteries. The power batteries of new energy vehicles are still mainly liquid electrolytes. Limited by the fast charging ability of the battery itself, there is still a problem of low energy replenishment efficiency. The main operating areas of pure electric light trucks and logistics vehicles are urban and suburban areas. The charging infrastructure is fully market-oriented, with very few special customizations. The market charging piles are mainly single-gun 250A. However, with the mass production of fast-charging batteries, the power has gradually increased, from about 100kWh to 140kWh-200kWh, the battery capacity has increased from the original 200Ah to 300Ah, and the battery charging rate has expanded from the original 1C to more than 2C. The continuous charging current of the battery can reach up to 600A, and the original single charging gun can no longer meet the use needs. Therefore, how to improve the energy replenishment efficiency of new energy vehicles is of great significance. Summary of the invention

[0003] The present invention provides a charging control method and system for a pure electric light truck, which solves the problem of low energy replenishment efficiency of existing pure electric light trucks and electric vehicles, can improve the charging efficiency of the vehicle, and meet the demand for ultra-fast charging of the vehicle.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A charging control method for a pure electric light truck, comprising:

[0006] A dual charging CAN circuit is set in the vehicle power battery management system BMS, corresponding to the main charging circuit and the auxiliary charging circuit respectively;

[0007] A main charging socket and an auxiliary charging socket are provided, the main charging gun is directly electrically connected to the power battery module through the main charging socket to form a main charging circuit, and the auxiliary charging gun is electrically connected to the all-in-one control box through the auxiliary charging socket to form an auxiliary charging circuit;

[0008] When the charging gun is plugged into the charging pile, the battery management system identifies the plug-in signals of the main charging gun and the auxiliary charging gun according to the CC signal, and then determines the single-gun charging mode or the dual-gun charging mode;

[0009] The battery management system BMS and vehicle controller VCU are woken up according to the duty cycle of the CP signal sent by the charging pile, and the charging current distribution is controlled according to the single-gun charging mode or the dual-gun charging mode.

[0010] Preferably, it also includes:

[0011] Set the maximum overcurrent threshold of the main charging gun to 400A and the maximum overcurrent threshold of the auxiliary charging gun to 250A;

[0012] When the main charging gun is charging alone, the battery management system BMS requests the pile current to take the smaller value of the current corresponding to 400A and 2C charging rate;

[0013] When the auxiliary charging gun is charged separately, the battery management system BMS requests the pile current to take the smaller value of 250A and the current corresponding to the 2C charging rate.

[0014] Preferably, it also includes:

[0015] When the main charging gun or the auxiliary charging gun is charging, if it is recognized that another charging gun is charging, the charging current is the current value corresponding to the 2C charging rate, and the charging current allocated to the auxiliary charging gun is 250A, and the rest is allocated to the main charging gun.

[0016] Preferably, it also includes:

[0017] When the main charging gun is charged alone, the charging A+ signal of the national charging standard wakes up the battery management system BMS and the vehicle controller VCU to complete the wake-up of the main charging gun.

[0018] Preferably, it also includes:

[0019] When the auxiliary charging gun is charging alone, the battery management system BMS recognizes the CC signal of the auxiliary charging gun and enters the battery management system BMS to wake up. The vehicle controller VCU recognizes the charging signal A+ to wake up the auxiliary charging gun.

[0020] Preferably, it also includes:

[0021] When the vehicle is awakened by the main charging gun and recognizes the CC signal of the auxiliary charging gun during charging, it enters the dual-gun charging mode.

[0022] Preferably, it also includes:

[0023] When the vehicle is awakened by the auxiliary charging gun and recognizes the CC signal of the main charging gun during charging, it enters the dual-gun charging mode.

[0024] The present invention also provides a charging control system for a pure electric light truck, using the above-mentioned charging control method, comprising: a main charging gun socket, an auxiliary charging gun socket and an all-in-one control box;

[0025] The power battery pack of the vehicle is electrically connected to the all-in-one control box, and the all-in-one control box is provided with a multi-way power supply circuit to supply power to the vehicle's electrical equipment;

[0026] The main charging gun socket is electrically connected to the positive electrode and the negative electrode of the power battery pack respectively to form a main charging circuit;

[0027] The auxiliary charging gun socket is electrically connected to a power supply circuit of the all-in-one control box to form an auxiliary charging circuit;

[0028] The battery management system BMS is signal-connected to the main charging gun socket and the auxiliary charging gun socket respectively through the CAN bus.

[0029] Preferably, the all-in-one control box is provided with a 400A power supply circuit, a 250A power supply circuit, a 40A power supply circuit, a 25A power supply circuit and a 200A power supply circuit, and the auxiliary charging gun socket is electrically connected to the 250A power supply circuit.

[0030] Preferably, a fast charging positive relay and a fast charging negative relay are provided in the main charging circuit and the auxiliary charging circuit, and the battery management system BMS is respectively connected to the control end signals of the fast charging positive relay and the fast charging negative relay to control the on and off of the main charging circuit and the auxiliary charging circuit.

[0031] The present invention provides a charging control method and system for a pure electric light truck, which provides a dual charging CAN circuit in the battery management system BMS, corresponding to the main charging gun and the auxiliary charging gun respectively, and then performs charging current distribution control according to the single-gun charging mode or the dual-gun charging mode. The problem of low energy replenishment efficiency of existing pure electric light trucks and electric vehicles is solved, the charging efficiency of the vehicle can be improved, and the demand for ultra-fast charging of the vehicle is met. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below.

[0033] Figure 1 It is a schematic diagram of a charging control method for a pure electric light truck provided by the present invention.

[0034] Figure 2 Schematic diagram of a BMS / VCU wake-up source provided by an embodiment of the present invention.

[0035] Figure 3 It is a schematic diagram of a charging control system for a pure electric light truck provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to enable persons skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0037] In view of the problem of low energy replenishment efficiency of current pure electric vehicles, the present invention provides a charging control method and system for a pure electric light truck, which solves the problem of low energy replenishment efficiency of existing pure electric light trucks, can improve the charging efficiency of the vehicle, and meet the demand for ultra-fast charging of the vehicle.

[0038] like Figure 1 As shown, a charging control method for a pure electric light truck includes:

[0039] S1: Set up dual charging CAN circuits in the vehicle power battery management system BMS, corresponding to the main charging circuit and the auxiliary charging circuit respectively;

[0040] S2: A main charging socket and an auxiliary charging socket are set up, the main charging gun is directly electrically connected to the power battery module through the main charging socket to form a main charging circuit, and the auxiliary charging gun is electrically connected to the all-in-one control box through the auxiliary charging socket to form an auxiliary charging circuit.

[0041] S3: When the charging gun is plugged into the charging pile, the battery management system identifies the plug-in signals of the main charging gun and the auxiliary charging gun according to the CC signal, and then determines the single-gun charging mode or the dual-gun charging mode.

[0042] S4: Wake up the battery management system BMS and vehicle controller VCU according to the duty cycle of the CP signal sent by the charging pile, and perform charging current distribution control according to the single-gun charging mode or the dual-gun charging mode.

[0043] Specifically, the main charging socket matches the main charging gun, which is directly connected to the inside of the battery pack. The high-voltage electrical components inside the battery are designed to have an overcurrent of 400A to form a main charging circuit. The auxiliary charging socket matches the auxiliary charging gun, which is a mass-produced model. It is connected to the all-in-one control box, and the overcurrent capacity remains at 250A to form an auxiliary charging circuit. During charging, the battery management system judges the plug-in signals of the main charging gun and the auxiliary charging gun according to the CC signal to determine the single-gun charging mode or the dual-gun charging mode, and wakes up the BMS and VCU according to the CP signal to control the charging current distribution of the main charging circuit and the auxiliary charging circuit to quickly charge the power battery module. This method can improve the charging efficiency of the vehicle and meet the needs of ultra-fast charging of the vehicle.

[0044] The method further includes: setting the maximum overcurrent threshold of the main charging gun to 400 A and the maximum overcurrent threshold of the auxiliary charging gun to 250 A; when the main charging gun is charging alone, the battery management system BMS requests the pile current to take the smaller value of 400 A and the current corresponding to the 2C charging rate; when the auxiliary charging gun is charging alone, the battery management system BMS requests the pile current to take the smaller value of 250 A and the current corresponding to the 2C charging rate.

[0045] The method further includes: when the main charging gun or the auxiliary charging gun is charging, if it is recognized that the other charging gun starts charging, the charging current is the current value corresponding to the 2C charging rate, the charging current of the auxiliary charging gun is allocated to 250 A, and the rest is allocated to the main charging gun.

[0046] The method further includes: when the main charging gun is charging alone, the battery management system BMS and the vehicle controller VCU are woken up according to the charging A+ signal of the national standard charging standard to complete the wake-up of the main charging gun.

[0047] The method further includes: when the auxiliary charging gun is charging alone, the battery management system BMS wakes up by identifying the CC signal of the auxiliary charging gun, and the vehicle controller VCU wakes up by identifying the charging signal A+ to complete the wake-up of the auxiliary charging gun.

[0048] In practical applications, as Figure 2 shown, when the main charging gun is inserted alone, the BMS / VCU is activated according to the national standard charging standard A+ to enter the national standard charging process; when the auxiliary charging gun is inserted alone, the BMS identifies the CC gun insertion signal to enter the BMS wake-up, and the VCU still identifies the A+ wake-up recognition to enter the national standard fast charging process; the internal wake-up and response of the BMS are distinguished in the above two methods. When the vehicle is woken up by the main charging gun and during the charging process, if the CC gun insertion signal of the auxiliary charging gun is recognized, it enters the dual-gun charging mode. Similarly, when the vehicle is woken up by the auxiliary charging gun and during the charging process, if the CC gun insertion signal of the main charging gun is recognized, it enters the dual-gun charging mode.

[0049] The method further includes: when the vehicle is woken up by the main charging gun and the CC signal of the auxiliary charging gun is recognized during the charging process, it enters the dual-gun charging mode.

[0050] The method further includes: when the vehicle is woken up by the auxiliary charging gun and the CC signal of the main charging gun is recognized during the charging process, it enters the dual-gun charging mode.

[0051] It can be seen that the present invention provides a charging control method for a pure electric light truck, which provides a dual charging CAN circuit in the battery management system BMS, corresponding to the main charging gun and the auxiliary charging gun respectively, and then performs charging current distribution control according to the single-gun charging mode or the dual-gun charging mode. It solves the problem of low energy replenishment efficiency of existing pure electric light trucks and electric vehicles, can improve the charging efficiency of vehicles, and meet the needs of ultra-fast charging of vehicles.

[0052] like Figure 3 As shown, the present invention also provides a charging control system for a pure electric light truck, using the above-mentioned charging control method, including: a main charging gun socket, an auxiliary charging gun socket and an all-in-one control box. The power battery pack of the vehicle is electrically connected to the all-in-one control box, and the all-in-one control box is provided with a multi-way power supply circuit to power the vehicle's electrical equipment; the main charging gun socket is electrically connected to the positive and negative electrodes of the power battery pack respectively to form a main charging circuit; the auxiliary charging gun socket is electrically connected to one power supply circuit of the all-in-one control box to form an auxiliary charging circuit; the battery management system BMS is signal-connected to the main charging gun socket and the auxiliary charging gun socket respectively through the CAN bus.

[0053] Furthermore, the all-in-one control box is provided with a 400A power supply circuit, a 250A power supply circuit, a 40A power supply circuit, a 25A power supply circuit and a 200A power supply circuit, and the auxiliary charging gun socket is electrically connected to the 250A power supply circuit.

[0054] In actual applications, the 400A power supply circuit supplies power to the drive motor, the 250A power supply circuit is electrically connected to the auxiliary charging socket, the 200A power supply circuit is used as a reserved power supply for the upper body, the 40A power supply circuit supplies power to the compressor, heater, passenger compartment heating equipment and air conditioning system respectively, and the 25A power supply circuit supplies power to the DC / DC module to convert 24V direct current. Relays need to be set in each power supply circuit, and the relays are connected to the vehicle controller or BMS signal to control the on and off of the power supply circuit.

[0055] Furthermore, a fast charging positive relay and a fast charging negative relay are provided in the main charging circuit and the auxiliary charging circuit, and the battery management system BMS is respectively connected to the control end signals of the fast charging positive relay and the fast charging negative relay to control the on and off of the main charging circuit and the auxiliary charging circuit.

[0056] In actual applications, in order to improve the efficiency of fast charging, a dual charging gun solution is designed based on the original product. The main charging socket matches the main charging gun, and the socket is directly connected to the inside of the battery pack. The high-voltage electrical components inside the battery are designed to have an overcurrent of 400A. The auxiliary charging socket matches the auxiliary charging gun, which is a mass-produced model. When connected to the all-in-one high-voltage box, the overcurrent capacity remains at 250A.

[0057] It can be seen that the present invention provides a charging control system for a pure electric light truck. By setting a dual-charging CAN loop in the battery management system BMS, corresponding to the main charging gun and the auxiliary charging gun respectively, the charging current distribution control is carried out according to the single-gun charging mode or the dual-gun charging mode. The problem of low energy replenishment efficiency of existing pure electric light truck electric vehicles is solved, the charging efficiency of the vehicle can be improved, and the need for ultra-fast charging of the vehicle can be met.

[0058] The structure, features and effects of the present invention have been described in detail based on the embodiments shown in the drawings. The above are only the preferred embodiments of the present invention, but the present invention is not limited to the scope of implementation shown in the drawings. Any changes made according to the concept of the present invention, or equivalent embodiments modified into equivalent changes, should still be within the protection scope of the present invention when they do not exceed the spirit covered by the specification and the drawings.

Claims

1. A charging control method for a pure electric light truck, characterized in that, include: A dual charging CAN circuit is set in the vehicle power battery management system BMS, corresponding to the main charging circuit and the auxiliary charging circuit respectively; A main charging socket and an auxiliary charging socket are provided, the main charging gun is directly electrically connected to the power battery module through the main charging socket to form a main charging circuit, and the auxiliary charging gun is electrically connected to the all-in-one control box through the auxiliary charging socket to form an auxiliary charging circuit; When the charging gun is plugged into the charging pile, the battery management system identifies the plug-in signals of the main charging gun and the auxiliary charging gun according to the CC signal, and then determines the single-gun charging mode or the dual-gun charging mode; The battery management system BMS and vehicle controller VCU are woken up according to the duty cycle of the CP signal sent by the charging pile, and the charging current distribution is controlled according to the single-gun charging mode or the dual-gun charging mode.

2. The charging control method of the pure electric light truck according to claim 1, characterized in that Also includes: Set the maximum overcurrent threshold of the main charging gun to 400A and the maximum overcurrent threshold of the auxiliary charging gun to 250A; When the main charging gun is charging alone, the battery management system BMS requests the pile current to take the smaller value of the current corresponding to 400A and 2C charging rate; When the auxiliary charging gun is charged separately, the battery management system BMS requests the pile current to take the smaller value of 250A and the current corresponding to the 2C charging rate.

3. The charging control method of the pure electric light truck according to claim 2, characterized in that, Also includes: When the main charging gun or the auxiliary charging gun is charging, if it is recognized that another charging gun is charging, the charging current is the current value corresponding to the 2C charging rate, and the charging current allocated to the auxiliary charging gun is 250A, and the rest is allocated to the main charging gun.

4. The charging control method of the pure electric light truck according to claim 3, characterized in that Also includes: When the main charging gun is charged alone, the charging A+ signal of the national charging standard wakes up the battery management system BMS and the vehicle controller VCU to complete the wake-up of the main charging gun.

5. The charging control method of the pure electric light truck according to claim 4, wherein, Also includes: When the auxiliary charging gun is charging alone, the battery management system BMS recognizes the CC signal of the auxiliary charging gun and enters the battery management system BMS to wake up. The vehicle controller VCU recognizes the charging signal A+ wake-up recognition to complete the auxiliary charging gun wake-up.

6. The charging control method of the pure electric light truck according to claim 5, wherein, Also includes: When the vehicle is awakened by the main charging gun and recognizes the CC signal of the auxiliary charging gun during charging, it enters the dual-gun charging mode.

7. The charging control method of the pure electric light truck according to claim 6, wherein Also includes: When the vehicle is awakened by the auxiliary charging gun and recognizes the CC signal of the main charging gun during charging, it enters the dual-gun charging mode.

8. A charging control system for a pure electric light truck, which uses the charging control method according to any one of claims 1 to 7, characterized in that include: Main charging gun socket, auxiliary charging gun socket and all-in-one control box; The power battery pack of the vehicle is electrically connected to the all-in-one control box, and the all-in-one control box is provided with a multi-way power supply circuit to supply power to the vehicle's electrical equipment; The main charging gun socket is electrically connected to the positive electrode and the negative electrode of the power battery pack respectively to form a main charging circuit; The auxiliary charging gun socket is electrically connected to a power supply circuit of the all-in-one control box to form an auxiliary charging circuit; The battery management system BMS is signal-connected to the main charging gun socket and the auxiliary charging gun socket respectively through the CAN bus.

9. The charging control system of the pure electric light truck according to claim 8, characterized in that, The all-in-one control box is provided with a 400A power supply circuit, a 250A power supply circuit, a 40A power supply circuit, a 25A power supply circuit and a 200A power supply circuit, and the auxiliary charging gun socket is electrically connected to the 250A power supply circuit.

10. The charging control system of the pure electric light truck according to claim 9, characterized in that Both the main charging circuit and the auxiliary charging circuit are provided with a fast charge positive relay and a fast charge negative relay. The battery management system BMS is respectively signal-connected to the control terminals of the fast charge positive relay and the fast charge negative relay to control the on / off of the main charging circuit and the auxiliary charging circuit.

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