Intelligent charging method, device and system for electric engineering vehicle, vehicle and medium

Abstract

The invention provides an intelligent charging method, device and system for an electric engineering vehicle, the vehicle and a medium, and relates to the technical field of engineering vehicles. The method comprises the following steps: after a charging signal of V2V charging equipment is detected, sending first charging information of a first engineering vehicle to a second engineering vehicle, and obtaining second charging information of the second engineering vehicle; the processing module is used for determining whether the first engineering vehicle is a recharging vehicle or not according to the first charging information and the second charging information; if the vehicle is a recharging vehicle, according to the recharging demand of the second engineering vehicle, performing intelligent recharging on the second engineering vehicle; and if the vehicle is not the charging vehicle, generating a corresponding charging demand according to the real-time battery state of the first engineering vehicle, and sending the charging demand of the first engineering vehicle to the second engineering vehicle. According to the method provided by the invention, the timeliness and quickness of charging of the electric engineering vehicle are improved, so that the charging demand of the electric engineering vehicle is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering vehicles, and particularly relates to an intelligent power supplement method, device, system, vehicle and medium for an electric engineering vehicle. BACKGROUND

[0002] The power battery of an electric engineering vehicle is mostly lithium iron phosphate, has a long platform period, and is prone to vehicle power feeding. Therefore, power supplement for the electric engineering vehicle is very important.

[0003] In related technologies, power supplement for the electric engineering vehicle generally has two modes. One is to seek an external special trailer to tow the power feeding vehicle to a charging station for power supplement. The other is to use a vehicle-to-vehicle (V2V) power supplement device to supplement power for the power feeding vehicle by using a vehicle with high power. However, since the working conditions of engineering vehicles are mostly non-paved roads such as mines and construction sites, the engineering vehicles are relatively large and heavy, it is very difficult to tow the power feeding vehicle to the charging station, the cost is high, and power supplement cannot be performed in time. The V2V power supplement device is also relatively large in size and cannot be carried with the vehicle. It is also difficult to tow the V2V power supplement device to the power feeding vehicle. In addition, the V2V power supplement device generally has a small power and cannot meet the demand for timely and rapid power supplement for the electric engineering vehicle.

[0004] Therefore, an intelligent power supplement scheme for an electric engineering vehicle is needed, which can improve the timeliness and rapidity of power supplement and thus meet the demand for power supplement for the electric engineering vehicle. SUMMARY

[0005] The present application provides an intelligent power supplement method, device, system, vehicle and medium for an electric engineering vehicle, which can improve the timeliness and rapidity of power supplement and thus meet the demand for power supplement for the electric engineering vehicle.

[0006] In a first aspect, an intelligent power supplement method for an electric engineering vehicle is provided, which is applied to a battery management system of a first engineering vehicle, the first engineering vehicle is connected with a second engineering vehicle through a vehicle-to-vehicle (V2V) power supplement device, the V2V power supplement device includes a first charging gun, a charging wire harness and a second charging gun connected in sequence, and the method includes the following steps.

[0007] After detecting a power supplement signal of the V2V power supplement device, first charging information of the first engineering vehicle is sent to the second engineering vehicle, and second charging information of the second engineering vehicle is acquired.

[0008] According to the first charging information and the second charging information, it is determined whether the first engineering vehicle is a power supplement vehicle.

[0009] If the first engineering vehicle is a power supplement vehicle, the second engineering vehicle is intelligently powered supplemented according to a power supplement demand of the second engineering vehicle;

[0010] If the first engineering vehicle is not a power supplement vehicle, a corresponding power supplement demand is generated according to a real-time battery state of the first engineering vehicle, and the power supplement demand of the first engineering vehicle is sent to the second engineering vehicle.

[0011] In a possible implementation, the sending of the first charging information of the first engineering vehicle to the second engineering vehicle and the obtaining of second charging information of the second engineering vehicle include:

[0012] The resistance value of the power supplement signal is obtained, and it is determined whether the resistance value of the power supplement signal is greater than a preset charging pile charging resistance value;

[0013] If the resistance value of the power supplement signal is greater than the charging pile charging resistance value, an intelligent power supplement mode is entered, the first charging information of the first engineering vehicle is sent to a battery management system of the second engineering vehicle, and second charging information sent by the battery management system of the second engineering vehicle is obtained;

[0014] If the resistance value of the power supplement signal is less than or equal to the charging pile charging resistance value, a charging pile charging mode is entered;

[0015] The first charging information includes a battery voltage platform V1 and a battery remaining capacity SOC1 of the first engineering vehicle, and the second charging information includes a battery voltage platform V2 and a battery remaining capacity SOC2 of the second engineering vehicle.

[0016] In a possible implementation, the determination of whether the first engineering vehicle is a power supplement vehicle according to the first charging information and the second charging information includes:

[0017] It is determined whether the battery remaining capacity SOC1 of the first engineering vehicle satisfies the following condition:

[0018] SOC1≥SOC0, and SOC1-SOC2>ΔSOC

[0019] SOC0 is a preset battery remaining capacity threshold, and ΔSOC is a preset capacity difference threshold.

[0020] If the condition is satisfied, the first engineering vehicle is determined to be a power supplement vehicle.

[0021] If the condition is not satisfied, the first engineering vehicle is determined to be a power feeding vehicle.

[0022] In a possible implementation, the intelligent power supplement of the second engineering vehicle according to the power supplement demand of the second engineering vehicle includes:

[0023] Obtain the dynamic charging demand and real-time battery status sent by the battery management system of the second engineering vehicle;

[0024] The corresponding output current is determined based on the dynamic power replenishment requirements and the real-time battery status.

[0025] Determine whether the battery voltage platform V1 of the first engineering vehicle is equal to the battery voltage platform V2 of the second engineering vehicle;

[0026] If V1 < V2, then the battery voltage platform V1 is boosted to the battery voltage platform V2, and the second engineering vehicle is intelligently charged according to the output current.

[0027] If V1 > V2, then the battery voltage platform V1 is stepped down to the battery voltage platform V2, and the second engineering vehicle is intelligently charged according to the output current;

[0028] If V1=V2, then the second engineering vehicle is intelligently recharged based on the battery voltage platform V1 and the output current.

[0029] In one possible implementation, before obtaining the dynamic charging demand and real-time battery status sent by the battery management system of the second engineering vehicle, the method further includes:

[0030] Step S1: Encrypt the preset first data using an encryption algorithm to obtain the second data, and send a first handshake message to the battery management system of the second engineering vehicle. The first handshake message includes the second data.

[0031] Step S2: Determine whether a second handshake message sent by the battery management system of the second engineering vehicle is obtained within a first preset time period. The second handshake message includes third data parsed from the second data.

[0032] Step S3: If the second handshake message is not obtained within the first preset time period, then repeat steps S1-S2 above. If steps S1-S2 are repeated a preset number of times and the second handshake message is still not obtained within the first preset time period, then stop power replenishment.

[0033] Step S4: If the second handshake message is obtained within the first preset time period, determine whether the third data is consistent with the first data;

[0034] Step S5: If they match, send a handshake verification success message to the battery management system of the second engineering vehicle so that the battery management system of the second engineering vehicle can send dynamic charging requirements and real-time battery status.

[0035] Step S6: If they are inconsistent, repeat steps S1-S5. If steps S1-S5 are repeated a preset number of times and the third data is still inconsistent with the first data, then stop the power replenishment.

[0036] In one possible implementation, it also includes:

[0037] The power-up operation will terminate if any of the following is detected during the power-up process:

[0038] The first engineering vehicle / the second engineering vehicle experienced a power supply failure.

[0039] The power supply signal of the V2V power supply device is interrupted for a second preset duration;

[0040] SOC1 < SOC0;

[0041] SOC1 = SOC2.

[0042] Secondly, this application provides a vehicle-to-vehicle (V2V) charging device, including: a first charging gun, a second charging gun and a charging harness, wherein the first charging gun is connected to the second charging gun through the charging harness, and the first charging gun and the second charging gun have the same configuration.

[0043] The charging harness includes a CC2 line, a CAN line, and a high-voltage line. The first end of the CC2 line is grounded, the second end is connected to the first charging gun through a first resistor, and the third end is connected to the second charging gun through a second resistor. The resistance values ​​of the first resistor and the second resistor are the same and greater than the charging resistance value of the charging pile.

[0044] The first charging gun is equipped with a first switch, and the second charging gun is symmetrically equipped with a second switch. Both the first switch and the second switch are normally closed switches. When the first switch / second switch is turned on, the power supply signal of the V2V power supply device is interrupted.

[0045] Thirdly, embodiments of this application provide a battery management system, including:

[0046] The transceiver module is used to send the first charging information of the first engineering vehicle to the second engineering vehicle after detecting the charging signal of the V2V charging equipment, and to obtain the second charging information of the second engineering vehicle.

[0047] The processing module is used to determine whether the first engineering vehicle is a charging vehicle based on the first charging information and the second charging information; if it is a charging vehicle, it performs intelligent charging on the second engineering vehicle according to the charging needs of the second engineering vehicle; if it is not a charging vehicle, it generates a corresponding charging need based on the real-time battery status of the first engineering vehicle and sends the charging need of the first engineering vehicle to the second engineering vehicle.

[0048] Fourthly, embodiments of this application provide another battery management system, including:

[0049] The processor, and the memory that is in communication with the processor;

[0050] Memory is used to store instructions that the computer executes;

[0051] The processor is configured to execute computer execution instructions stored in memory, causing the processor to perform the first aspect and / or various possible implementations of the first aspect as described above.

[0052] Fifthly, embodiments of this application provide an electric engineering vehicle, including: a battery management system as described in the fourth aspect.

[0053] In a sixth aspect, embodiments of this application provide an intelligent charging system for electric engineering vehicles, including: a first engineering vehicle, a second engineering vehicle, and V2V charging equipment as described in the second aspect, wherein the first engineering vehicle / second engineering vehicle includes: a battery management system as described in the fourth aspect;

[0054] The first engineering vehicle is connected to the first charging gun of the V2V charging equipment, and the second engineering vehicle is connected to the second charging gun of the V2V charging equipment.

[0055] In a seventh aspect, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the first aspect and / or various possible implementations of the first aspect described above.

[0056] Eighthly, embodiments of this application provide a computer program product, including a computer program, which, when executed by a processor, is used to implement the first aspect and / or various possible implementations of the first aspect as described above.

[0057] This application provides an intelligent charging method, device, system, vehicle, and medium for electric engineering vehicles. It integrates most of the functions of existing V2V charging devices into the battery management system of the engineering vehicle. The V2V charging device retains only the first charging gun, charging harness, and second charging gun, significantly reducing its size and allowing it to be carried on-board. The engineering vehicle's battery management system integrates intelligent charging functionality. Under normal circumstances, the engineering vehicle can operate normally. Upon detecting the charging signal from the V2V charging device, the battery management system intelligently determines the charging vehicle and the recharging vehicle based on the charging information of the vehicles on both sides of the device. It then performs intelligent charging according to the recharging vehicle's charging needs, achieving intelligent charging without manual operation. With this setup, when the engineering vehicle is low on power, the operator can simply connect the on-board V2V charging device to a vehicle with a higher battery level for immediate charging, eliminating the need for complex operations such as towing. This greatly improves the convenience, timeliness, and efficiency of vehicle charging. Furthermore, the high charging power of the battery management system significantly shortens the charging time, thus meeting the timely and rapid charging needs of electric engineering vehicles. Attached Figure Description

[0058] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0059] Figure 1 This is a schematic diagram of the intelligent power replenishment system for an electric engineering vehicle according to an embodiment of this application;

[0060] Figure 2 A flowchart illustrating an intelligent power replenishment method for an electric engineering vehicle according to an embodiment of this application;

[0061] Figure 3 A schematic diagram of the process before intelligent power replenishment;

[0062] Figure 4 A schematic diagram illustrating the process of intelligent power replenishment;

[0063] Figure 5 This is a schematic diagram of the structure of a battery management system according to an embodiment of this application;

[0064] Figure 6 This is a schematic diagram of the structure of a battery management system according to another embodiment of this application.

[0065] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0066] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0067] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0068] The collection, storage, use, processing, transmission, provision, and disclosure of financial data or user data involved in the technical solution of this application all comply with the provisions of relevant laws and regulations and do not violate public order and good morals.

[0069] It should be noted that in the embodiments of this application, certain software, components, models and other existing solutions in the industry may be mentioned. These should be regarded as exemplary and are only intended to illustrate the feasibility of implementing the technical solution of this application. However, they do not mean that the applicant has used or necessarily used the solution.

[0070] It should also be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties. Furthermore, the collection, use and processing of the relevant data must comply with relevant laws, regulations and standards, and corresponding operation entry points are provided for users to choose to authorize or refuse.

[0071] The intelligent charging method, equipment, system, vehicle, and medium for electric engineering vehicles disclosed in this application can be used in the field of engineering vehicles, as well as in any other field besides engineering vehicles, such as vehicle charging. The application fields of the intelligent charging method, equipment, system, vehicle, and medium for electric engineering vehicles disclosed in this application are not limited.

[0072] The intelligent power replenishment method, equipment, system, vehicle, and medium for electric engineering vehicles disclosed in this application can be applied to scenarios where electric engineering vehicles are recharged after a power outage. Any scenario involving electric engineering vehicles using V2V power replenishment equipment can be applied to the intelligent power replenishment method, equipment, system, vehicle, and medium disclosed in this application.

[0073] The power batteries of electric engineering vehicles are mostly lithium iron phosphate batteries, which have a relatively long plateau period and are prone to vehicle depletion. Therefore, recharging electric engineering vehicles is very important.

[0074] In related technologies, there are generally two ways to recharge electric engineering vehicles:

[0075] ① Seek external dedicated trailers to tow the power supply vehicle to the charging station for recharging. However, since engineering vehicles are mostly used in mines, construction sites and other uneven, unpaved roads, and are relatively large and heavy, it is very difficult to tow the power supply vehicle to the charging station. This is costly and cannot recharge the vehicle in a timely manner.

[0076] ② Use vehicle-to-vehicle (V2V) charging equipment to charge the power supply vehicle from a vehicle with a higher battery level. However, V2V charging equipment is relatively large and cannot be carried with the vehicle. It is also difficult to tow the V2V charging equipment to the power supply vehicle. In addition, V2V charging equipment generally has relatively low power and cannot meet the timely and rapid charging needs of electric engineering vehicles.

[0077] Based on the above-mentioned technical problems, the inventive concept of this application is: how to provide an intelligent power replenishment solution for electric engineering vehicles that can improve the timeliness and speed of power replenishment, thereby meeting the power replenishment needs of electric engineering vehicles.

[0078] This application provides an intelligent charging method, device, system, vehicle, and medium for electric engineering vehicles. It integrates most of the functions of existing V2V charging devices into the battery management system of the engineering vehicle. The V2V charging device retains only the first charging gun, charging harness, and second charging gun, significantly reducing its size and allowing it to be carried on-board. The engineering vehicle's battery management system integrates intelligent charging functionality. Under normal circumstances, the engineering vehicle can operate normally. Upon detecting the charging signal from the V2V charging device, the battery management system intelligently determines the charging vehicle and the recharging vehicle based on the charging information of the vehicles on both sides of the device. It then performs intelligent charging according to the recharging vehicle's charging needs, achieving intelligent charging without manual operation. With this setup, when the engineering vehicle is low on power, the operator can simply connect the on-board V2V charging device to a vehicle with a higher battery level for immediate charging, eliminating the need for complex operations such as towing. This greatly improves the convenience, timeliness, and efficiency of vehicle charging. Furthermore, the high charging power of the battery management system significantly shortens the charging time, thus meeting the timely and rapid charging needs of electric engineering vehicles.

[0079] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0080] Figure 1 This is a schematic diagram of the intelligent charging system for an electric engineering vehicle according to an embodiment of this application, as shown below. Figure 1 As shown, the intelligent power replenishment system may include a first engineering vehicle, a second engineering vehicle, and V2V power replenishment equipment.

[0081] The V2V charging equipment may include: a first charging gun, a second charging gun, and a charging harness. The first charging gun is connected to the second charging gun via the charging harness. The first and second charging guns have the same configuration. The first charging gun is connected to a first engineering vehicle, and the second charging gun is connected to a second engineering vehicle.

[0082] The charging harness may include a CC2 line, a CAN line and a high-voltage line. The first end of the CC2 line is grounded, the second end is connected to the first charging gun through a first resistor, and the third end is connected to the second charging gun through a second resistor. The resistance values ​​of the first resistor and the second resistor are the same and greater than the charging resistance value of the charging pile.

[0083] The first charging gun is equipped with a first switch, and the second charging gun is symmetrically equipped with a second switch. Both the first and second switches are normally closed switches. When the first / second switch is turned on, the power supply signal of the V2V power supply equipment is interrupted.

[0084] In this embodiment, the first engineering vehicle can be any electric engineering vehicle connected to the V2V charging equipment, and the second engineering vehicle can be another electric engineering vehicle connected to the V2V charging equipment. The first engineering vehicle and the second engineering vehicle can be substituted for each other.

[0085] In this embodiment, the first charging gun can be any charging gun of the V2V charging equipment, connected to the first engineering vehicle / second engineering vehicle, and the second charging gun can be another charging gun of the V2V charging equipment, connected to the remaining second engineering vehicle / first engineering vehicle. The first charging gun and the second charging gun can be interchanged.

[0086] In this embodiment, the first charging gun and the second charging gun can be the same model of charging gun, so that the two ends of the V2V charging device are symmetrically arranged, without distinguishing between the charging end and the discharging end. The charging gun is plug-and-play, which improves the convenience of the charging operation.

[0087] In this embodiment, the CC2 line can be a wiring harness that transmits a charging connection confirmation signal (CC2 signal), the CAN line can be a wiring harness used for information exchange between the first engineering vehicle and the second engineering vehicle, and the high-voltage line can be a wiring harness suitable for high-voltage power replenishment.

[0088] In this embodiment, the resistance values ​​of the first resistor and the second resistor can be flexibly set by those skilled in the art according to actual conditions. For example, they can be 3kΩ or 4kΩ, as long as they are greater than the charging resistance value of the charging pile (usually 1.5kΩ). No restrictions are imposed here.

[0089] In this embodiment, the first switch / second switch can be a CC2 signal switch (connected to the charging gun via the CC2 line). The first switch / second switch is a normally closed switch, which is used to maintain the charging signal of the V2V charging equipment when closed, and to interrupt the charging signal when open.

[0090] In this embodiment, traditional V2V charging equipment typically integrates control and power modules, resulting in bulky and costly devices. Therefore, most of the functions of the V2V charging equipment can be integrated into the battery management system of the engineering vehicle. The V2V charging equipment only retains the first charging gun, charging harness, and second charging gun, significantly reducing its size and allowing it to be carried on-vehicle. Furthermore, the symmetrical design of the first and second charging guns eliminates the need to distinguish between charging and discharging ends; the operator only needs to connect the equipment to any vehicle interface to initiate the charging process, completely eliminating the risk of misoperation due to reverse connection. This setup significantly reduces the size and weight of the V2V charging equipment, enabling it to be carried on-vehicle and quickly deployed at the work site without the need for complex operations such as towing, greatly improving the convenience, timeliness, and efficiency of vehicle charging.

[0091] Figure 2 This is a flowchart illustrating an intelligent charging method for an electric engineering vehicle according to an embodiment of this application. This embodiment describes the intelligent charging method for the electric engineering vehicle using the battery management system of a first engineering vehicle as the executing entity. The first engineering vehicle is connected to a second engineering vehicle via a vehicle-to-vehicle (V2V) charging device. The V2V charging device includes: a first charging gun, a charging harness, and a second charging gun connected in sequence. Figure 2 As shown, the intelligent charging method for this electric engineering vehicle may include the following steps:

[0092] S201: After detecting the charging signal of the V2V charging equipment, the first charging information of the first engineering vehicle is sent to the second engineering vehicle, and the second charging information of the second engineering vehicle is obtained.

[0093] In this embodiment, the battery management system of the engineering vehicle can integrate most of the functions of traditional V2V charging equipment (control functions, power functions, etc.). The V2V charging equipment only retains the first charging gun, charging harness and second charging gun, which greatly reduces the size of the V2V charging equipment and makes it possible to carry the V2V charging equipment with the vehicle.

[0094] In this embodiment, after the operator discovers that the engineering vehicle is out of power, he can select the engineering vehicle with higher power from the engineering vehicles in the current working environment as the charging vehicle, and take out the V2V charging equipment carried with him, inserting one end of the charging gun into the charging vehicle and the other end into the power supply vehicle.

[0095] In this embodiment, the charging signal of the V2V charging device can be the charging gun insertion signal, which is transmitted to the battery management system through the CC2 line in the charging harness.

[0096] In this embodiment, the charging information may be the remaining battery power and the battery voltage plateau (battery rated operating voltage).

[0097] In this embodiment, the battery management system of the first engineering vehicle can send the first charging information of the first engineering vehicle to the battery management system of the second engineering vehicle through the CAN line in the charging harness; the battery management system of the second engineering vehicle can send the second charging information of the second engineering vehicle to the battery management system of the first engineering vehicle through the CAN line in the charging harness, and the two can interact with battery information, etc. through the CAN line.

[0098] S202: Based on the first charging information and the second charging information, determine whether the first engineering vehicle is a charging vehicle.

[0099] In this embodiment, it is not necessary to manually set up a charging vehicle and a recharge vehicle during the intelligent charging process of the engineering vehicle. The operator only needs to complete the plug-in operation. The battery management system can automatically identify the charging vehicle and the recharge vehicle based on the charging information of the engineering vehicle.

[0100] S203: If it is a power replenishment vehicle, then intelligent power replenishment will be performed on the second engineering vehicle according to its power replenishment needs.

[0101] In this embodiment, if the first engineering vehicle is a charging vehicle, the battery management system of the first engineering vehicle acts as the active party for charging the vehicle and performs charging control. It intelligently charges the second engineering vehicle according to the charging request sent by the second engineering vehicle. The battery management system of the second engineering vehicle is only responsible for sending information such as dynamic charging request and real-time battery status to the battery management system of the first engineering vehicle.

[0102] S204: If it is not a charging vehicle, then generate the corresponding charging demand based on the real-time battery status of the first engineering vehicle, and send the charging demand of the first engineering vehicle to the second engineering vehicle.

[0103] In this embodiment, if the first engineering vehicle is not a charging vehicle (but a battery feeding vehicle), then the battery management system of the first engineering vehicle is only responsible for sending information such as dynamic charging demand and real-time battery status to the battery management system of the second engineering vehicle. The battery management system of the second engineering vehicle acts as the active party for vehicle charging and performs charging control, and performs intelligent charging for the first engineering vehicle according to the charging demand sent by the first engineering vehicle.

[0104] In this embodiment, no additional hardware is required for the engineering vehicle; only the battery management system needs to be upgraded with an intelligent charging control program. Since multiple engineering vehicles typically operate in the same environment, only the battery management systems of a few of these vehicles need to be upgraded to enable charging control functionality. When no vehicle power depletion occurs in the operating environment, all engineering vehicles can operate normally.

[0105] When a vehicle loses power, the onboard V2V charging equipment can be used to connect the charging vehicle to a vehicle with charging control function, enabling quick and convenient vehicle charging. This eliminates the need to tow the charging vehicle / traditional V2V charging equipment or to have a separate spare vehicle with charging control function, greatly reducing the cost of vehicle charging.

[0106] In this embodiment, most of the functions of existing V2V charging equipment can be integrated into the battery management system of the engineering vehicle. The V2V charging equipment only retains the first charging gun, charging harness, and second charging gun, greatly reducing its size and allowing it to be carried on-board. The engineering vehicle's battery management system integrates intelligent charging functionality. Under normal circumstances, the engineering vehicle can operate normally. After detecting the charging signal from the V2V charging equipment, the battery management system can intelligently determine the charging vehicle and the recharging vehicle based on the charging information of the vehicles on both sides of the equipment, and perform intelligent charging according to the recharging vehicle's charging needs, achieving intelligent charging without manual operation. With this setup, when the engineering vehicle is low on power, the operator can simply connect the V2V charging equipment carried on the vehicle to a vehicle with a higher battery level for timely charging, eliminating the need for complex operations such as towing. This greatly improves the convenience, timeliness, and efficiency of vehicle charging, while the high charging power of the battery management system also significantly shortens the charging time, thus meeting the timely and rapid charging needs of electric engineering vehicles.

[0107] In one possible implementation, step S201 above, which involves sending the first charging information of the first engineering vehicle to the second engineering vehicle and obtaining the second charging information of the second engineering vehicle, may include:

[0108] S11: Obtain the resistance value of the charging signal and determine whether the resistance value of the charging signal is greater than the preset charging resistance value of the charging pile.

[0109] S12: If the charging resistance is greater than that of the charging pile, the intelligent charging mode is entered, the first charging information of the first engineering vehicle is sent to the battery management system of the second engineering vehicle, and the second charging information sent by the battery management system of the second engineering vehicle is obtained.

[0110] S13: If the resistance is less than or equal to that of the charging pile, then enter the charging pile charging mode.

[0111] The first charging information includes the battery voltage platform V1 and the remaining battery charge SOC1 of the first engineering vehicle, and the second charging information includes the battery voltage platform V2 and the remaining battery charge SOC2 of the second engineering vehicle.

[0112] In this embodiment, the resistance value of the compensation signal can be the resistance value of the CC2 line. A large resistance is provided on the CC2 line to increase the resistance value of the compensation signal (e.g., 3kΩ).

[0113] In this embodiment, the preset charging resistance value of the charging pile can be flexibly set by those skilled in the art according to the resistance value of the charging signal when the charging pile is charging. For example, the charging resistance value of the charging pile can be 1.5kΩ, and no limitation is made here.

[0114] In this embodiment, both the battery management system of the first engineering vehicle and the battery management system of the second engineering vehicle can determine the charging mode based on the resistance value of the charging signal, and exchange information after confirming that it is an intelligent charging mode.

[0115] For example, when a V2V charging device is connected to a vehicle, the battery management system obtains the charging signal resistance value after power-on. If the resistance value is greater than 1.5KΩ (3kΩ), the charging signal is considered valid and the intelligent charging mode is entered. If the resistance value is less than or equal to 1.5KΩ, the charging mode of the charging pile is entered, and the charging mode is not entered.

[0116] In this embodiment, a large resistor is provided on the CC2 line, which can increase the resistance value of the charging signal. This results in a significant difference in the resistance value of the charging signal when the vehicle is charged using a charging pile and when it is charged using a V2V charging device. By comparing the resistance value of the charging signal with the charging resistance value of the charging pile, the charging mode of the vehicle can be quickly and accurately determined.

[0117] In one possible implementation, step S202, which determines whether the first engineering vehicle is a charging vehicle based on the first charging information and the second charging information, may include:

[0118] S21: Determine whether the remaining battery charge SOC1 of the first engineering vehicle meets the following conditions:

[0119] SOC1≥SOC0, and SOC1-SOC2>ΔSOC

[0120] Where SOC0 is the preset remaining battery power threshold, and ΔSOC is the preset power difference threshold.

[0121] S22: If satisfied, the first engineering vehicle is determined to be a power supply vehicle.

[0122] S23: If not satisfied, then the first engineering vehicle is determined to be a power supply vehicle.

[0123] In this embodiment, the preset battery remaining power threshold can be flexibly set by those skilled in the art according to actual conditions. For example, the battery remaining power threshold can be 40% or 50%, and no restrictions are imposed here.

[0124] In this embodiment, the preset power difference threshold can be flexibly set by those skilled in the art according to actual conditions. For example, the power difference threshold can be 10% or 20%, and no restrictions are imposed here.

[0125] For example, the battery remaining charge SOC1 of the first engineering vehicle is 60%, the battery remaining charge SOC2 of the second engineering vehicle is 20%, the preset battery remaining charge threshold SOC0 is 40%, and the preset charge difference threshold ΔSOC is 20%. Since SOC1 (60%) > SOC0 (40%) and SOC1 (60%) - SOC2 (20%) = 40% > ΔSOC (20%), it can be determined that the first engineering vehicle is a charging vehicle and the second engineering vehicle is a power supply vehicle.

[0126] In this embodiment, the charging vehicle and the power supply vehicle can be quickly and accurately identified based on the relationship between the remaining battery power of the first engineering vehicle and the preset remaining battery power threshold, as well as the remaining battery power of the second engineering vehicle, without the need for manual selection, thus improving the intelligence and automation of the charging operation.

[0127] In one possible implementation, step S203 above, which involves intelligently replenishing the power of the second engineering vehicle based on its power replenishment needs, may include:

[0128] S31: Obtain the dynamic charging requirements and real-time battery status sent by the battery management system of the second engineering vehicle.

[0129] S32: Determine the corresponding output current based on dynamic charging requirements and real-time battery status;

[0130] S33: Determine whether the battery voltage platform V1 of the first engineering vehicle is equal to the battery voltage platform V2 of the second engineering vehicle.

[0131] S34: If V1 < V2, then boost the battery voltage platform V1 to the battery voltage platform V2, and intelligently replenish the power to the second engineering vehicle according to the output current.

[0132] S35: If V1 > V2, then the battery voltage platform V1 will be stepped down to the battery voltage platform V2, and the second engineering vehicle will be intelligently charged according to the output current.

[0133] S36: If V1=V2, then intelligent power replenishment is performed on the second engineering vehicle based on the battery voltage platform V1 and the output current.

[0134] In this embodiment, the battery management system of the second engineering vehicle can continuously send charging-related information such as dynamic charging needs, real-time battery status, charging socket temperature, and fault information through the CAN bus.

[0135] In this embodiment, the real-time battery status may include charging-related battery information such as real-time current, real-time voltage, and real-time battery charge.

[0136] In this embodiment, the battery voltage platform can be the battery's rated operating voltage, such as 400V, 600V, etc.

[0137] In this embodiment, the battery management system of the engineering vehicle can continuously adjust the output current according to the dynamic charging needs of the power supply vehicle and the real-time battery status; and perform boost / buck processing according to the battery voltage platform of the two vehicles to make the battery voltage platform of the two vehicles equal, thereby realizing intelligent charging of the power supply vehicle.

[0138] In one possible implementation, before obtaining the dynamic charging demand and real-time battery status sent by the battery management system of the second engineering vehicle in step S31 above, the following may also be included:

[0139] Step S1: Encrypt the preset first data using an encryption algorithm to obtain the second data, and send a first handshake message to the battery management system of the second engineering vehicle. The first handshake message includes the second data.

[0140] Step S2: Determine whether the second handshake message sent by the battery management system of the second engineering vehicle has been obtained within the first preset time period. The second handshake message includes third data after parsing the second data.

[0141] Step S3: If the second handshake message is not obtained within the first preset time period, repeat steps S1-S2 above. If steps S1-S2 are repeated a preset number of times and the second handshake message is still not obtained within the first preset time period, then stop power replenishment.

[0142] Step S4: If the second handshake message is obtained within the first preset time period, determine whether the third data is consistent with the first data.

[0143] Step S5: If they match, a handshake verification success message is sent to the battery management system of the second engineering vehicle so that the battery management system of the second engineering vehicle can send dynamic charging requirements and real-time battery status.

[0144] Step S6: If they are inconsistent, repeat steps S1-S5. If steps S1-S5 are repeated a preset number of times and the third data is still inconsistent with the first data, stop the power replenishment.

[0145] In this embodiment, the first data may be a verification code pre-stored in the battery management system of the first engineering vehicle, and no restrictions are imposed here.

[0146] In this embodiment, the encryption algorithm can be any existing symmetric encryption algorithm, asymmetric encryption algorithm, etc., and no restrictions are imposed here.

[0147] In this embodiment, the first preset duration can be flexibly set by those skilled in the art according to actual conditions. For example, it can be 1 second, and no restrictions are imposed here.

[0148] In this embodiment, the preset number of times steps S1-S2 are repeated is the same as the preset number of times steps S1-S5 are repeated. Those skilled in the art can set it flexibly according to actual needs. For example, it can be 4 times, and no limitation is made here.

[0149] For example, the BMS of the power supply vehicle sends a CBHM (Browser-to-Hydropower Module) for key matching and handshaking. After receiving the message, the BMS of the feeder vehicle calculates the KEY using the MD5 algorithm and then sends the KEY back to the BMS of the power supply vehicle via the CBHM. The BMS of the power supply vehicle checks whether the KEY matches its own calculated MD5 key. The feeder vehicle BMS is required to respond within 1 second after the key is sent. If no response is received or the verification fails, the BMS of the power supply vehicle sends the key a second time, up to a total of 5 times. If the BMS of the power supply vehicle still does not receive a response or the verification fails, it reports that the KEY is incorrect, the verification fails, and the power supply process stops. If the handshake verification is successful during the process, the transmission stops.

[0150] In this embodiment, before obtaining the information sent by the battery management system of the second engineering vehicle, it is also necessary to use a key algorithm to perform a handshake verification between the battery feeding vehicle and the battery replenishing vehicle. Only when the handshake verification is successful will the subsequent battery replenishment operation be carried out, thus preventing erroneous battery replenishment and improving the security of intelligent battery replenishment for vehicles.

[0151] In one possible implementation, the method may further include:

[0152] The power-up operation will terminate if any of the following is detected during the power-up process:

[0153] The first engineering vehicle / second engineering vehicle experienced a power outage;

[0154] The second preset duration for interruption of the power supply signal of the V2V power supply equipment;

[0155] SOC1 < SOC0;

[0156] SOC1 = SOC2.

[0157] In this embodiment, whether the first engineering vehicle / second engineering vehicle has experienced a power-stopping fault can be determined through the fault message exchanged by the battery management system. The power-stopping fault can be a fault that affects the power-stopping process.

[0158] In this embodiment, the second preset duration can be flexibly set by those skilled in the art according to actual conditions. For example, it can be 3 seconds, and no restrictions are imposed here.

[0159] In this embodiment, a first switch is provided on the first charging gun, and a second switch is symmetrically provided on the second charging gun. The first switch / second switch is a normally closed switch. When closed, it is used to maintain the power supply signal of the V2V power supply equipment. The operator can stop the power supply by pressing and holding the first switch / second switch for a certain period of time. If power supply is required again, the V2V power supply equipment can be plugged in and unplugged.

[0160] In this embodiment, if a fault is detected in the first or second engineering vehicle during the charging process, the charging will stop, further improving the safety of intelligent vehicle charging. Charging will also stop after the charging signal is interrupted for a certain period of time, improving the convenience of stopping the charging. Charging will also stop when the remaining battery charge SOC1 of the first engineering vehicle is less than a preset remaining battery charge threshold, or when the remaining battery charge SOC1 of the first engineering vehicle is equal to the remaining battery charge SOC2 of the second engineering vehicle, to prevent the charging vehicle from running out of power.

[0161] The intelligent power replenishment method for electric engineering vehicles of this application is illustrated below with a specific embodiment.

[0162] In one specific embodiment, an electric engineering vehicle is in operation. At a certain moment, the operator discovers that electric engineering vehicle A has run out of power and selects electric engineering vehicle B with higher power from the engineering vehicles in the current working environment to replenish the power.

[0163] The electric engineering vehicle B carries V2V charging equipment, such as... Figure 1 As shown, the V2V charging device includes: a first charging gun, a second charging gun, and a charging harness. The first charging gun is connected to the second charging gun via the charging harness, and the first and second charging guns have the same configuration.

[0164] The charging harness may include a CC2 line, a CAN line, and a high-voltage line. The first end of the CC2 line is grounded, the second end is connected to the first charging gun through a first resistor, and the third end is connected to the second charging gun through a second resistor. The resistance values ​​of the first and second resistors are the same and greater than the charging resistance value of the charging pile.

[0165] The first charging gun is equipped with a first switch, and the second charging gun is symmetrically equipped with a second switch. Both the first and second switches are normally closed switches. When the first / second switch is turned on, the power supply signal of the V2V power supply equipment is interrupted.

[0166] The operator inserts the first charging gun (and second charging gun) into electric engineering vehicle A and the second charging gun (and first charging gun) into electric engineering vehicle B to begin intelligent charging. Figure 3 A schematic diagram illustrating the process before intelligent power replenishment. Figure 4 A schematic diagram of the intelligent power replenishment process, as shown below. Figure 3 and 4As shown, the specific intelligent power replenishment process is as follows:

[0167] The first step is that after the battery management system of electric engineering vehicle B (A) detects the charging signal of V2V charging equipment, it obtains the resistance value of the charging signal and determines that the resistance value of the charging signal (3kΩ) is greater than the preset charging resistance value of the charging pile (1.5KΩ), then enters the intelligent charging mode.

[0168] In the second step, the battery management system of electric engineering vehicle B sends the first charging information of electric engineering vehicle B (battery voltage platform V1 and battery remaining capacity SOC1) to the battery management system of electric engineering vehicle A, and the battery management system of electric engineering vehicle A sends the second charging information (battery voltage platform V2 and battery remaining capacity SOC2) to the battery management system of electric engineering vehicle B.

[0169] The third step is that the battery management system of electric engineering vehicle B determines that the remaining battery charge SOC1 of electric engineering vehicle B meets the following conditions: SOC1≥SOC0 and SOC1-SOC2>ΔSOC. Then, electric engineering vehicle B is determined to be a charging vehicle and electric engineering vehicle A is a power supply vehicle.

[0170] The fourth step involves the battery management system of electric engineering vehicle B using a key algorithm to perform a handshake verification between the battery feeder vehicle and the battery replenishment vehicle. After the handshake verification is successful, the system obtains the dynamic replenishment demand and real-time battery status sent by the battery management system of electric engineering vehicle A.

[0171] Fifth, the battery management system of electric engineering vehicle B determines the corresponding output current based on dynamic charging needs and real-time battery status; if it is determined that the battery voltage platform V1 of electric engineering vehicle B is greater than the battery voltage platform V2 of electric engineering vehicle A, then the battery voltage platform V1 is stepped down to the battery voltage platform V2, and intelligent charging is performed on electric engineering vehicle A according to the output current.

[0172] Step 6: The battery management system of electric engineering vehicle A sends dynamic charging demand and real-time battery status in real time, and the battery management system of electric engineering vehicle B adjusts the output current in real time according to the dynamic charging demand and real-time battery status.

[0173] Step 7: At a certain moment, the operator presses and holds the first switch on the first charging gun for 3 seconds. After the battery management system of electric engineering vehicle B detects that the charging signal of the V2V charging device is interrupted for 3 seconds, it stops charging. The operator then unplugs the charging gun to complete the charging operation.

[0174] Figure 5 This is a schematic diagram of the structure of a battery management system according to an embodiment of this application, as shown below. Figure 5As shown, the battery management system includes: a transceiver module 51, used to send the first charging information of the first engineering vehicle to the second engineering vehicle after detecting the charging signal of the V2V charging device, and to obtain the second charging information of the second engineering vehicle; and a processing module 52, used to determine whether the first engineering vehicle is a charging vehicle based on the first charging information and the second charging information; if it is a charging vehicle, then intelligently charging the second engineering vehicle according to its charging needs; if it is not a charging vehicle, then generating a corresponding charging need based on the real-time battery status of the first engineering vehicle, and sending the charging need of the first engineering vehicle to the second engineering vehicle.

[0175] The battery management system provided in this application embodiment can execute the technical solutions shown in the above method embodiments. Its implementation principle and beneficial effects are similar, and will not be described again here.

[0176] Figure 6 This is a schematic diagram of the battery management system according to another embodiment of this application, as shown below. Figure 6 As shown, the battery management system includes: a processor 601 and a memory 602 communicatively connected to the processor 601; the memory 602 stores computer execution instructions; the processor 601 executes the computer execution instructions stored in the memory 602 to implement the steps of the intelligent charging method for electric engineering vehicles in the above-described method embodiments.

[0177] In the aforementioned battery management system, the memory 602 and the processor 601 are electrically connected directly or indirectly to enable data transmission or interaction. For example, these components can be electrically connected to each other via one or more communication buses or signal lines, such as a bus connection. The memory 602 stores computer-executable instructions that implement data access control methods, including at least one software functional module that can be stored in the memory 602 in the form of software or firmware. The processor 601 executes various functional applications and data processing by running the software programs and modules stored in the memory 602.

[0178] The memory 602 may be, but is not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), etc. The memory 602 stores programs, which are executed by the processor 601 upon receiving execution instructions. Furthermore, the software programs and modules within the memory 602 may include an operating system, which may include various software components and / or drivers for managing system tasks (e.g., memory management, storage device control, power management, etc.) and can communicate with various hardware or software components to provide an operating environment for other software components.

[0179] Processor 601 can be an integrated circuit chip with signal processing capabilities. The aforementioned processor 601 can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor.

[0180] One embodiment of this application also provides an electric engineering vehicle, which may include a battery management system as shown in the figure.

[0181] An embodiment of this application also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the steps of the various method embodiments of this application.

[0182] An embodiment of this application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the various method embodiments of this application.

[0183] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0184] It should be further noted that although the steps in the flowchart are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowchart may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0185] It should be understood that the above-described device embodiments are merely illustrative, and the device of this application can also be implemented in other ways. For example, the division of units / modules in the above embodiments is only a logical functional division, and there may be other division methods in actual implementation. For example, multiple units, modules, or components may be combined, or integrated into another system, or some features may be ignored or not executed.

[0186] Furthermore, unless otherwise specified, the functional units / modules in the various embodiments of this application can be integrated into one unit / module, or each unit / module can exist physically separately, or two or more units / modules can be integrated together. The integrated units / modules described above can be implemented in hardware or as software program modules.

[0187] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0188] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the appended claims.

[0189] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A smart charging method for electric engineering vehicles, characterized in that, A battery management system applied to a first engineering vehicle, wherein the first engineering vehicle is connected to a second engineering vehicle via a vehicle-to-vehicle (V2V) charging device, the V2V charging device comprising: a first charging gun, a charging harness, and a second charging gun connected in sequence, the method comprising: After detecting the charging signal of the V2V charging device, the first charging information of the first engineering vehicle is sent to the second engineering vehicle, and the second charging information of the second engineering vehicle is obtained. Based on the first charging information and the second charging information, determine whether the first engineering vehicle is a charging vehicle; If it is a charging vehicle, then intelligent charging will be performed on the second engineering vehicle according to its charging needs; If it is not a charging vehicle, then a corresponding charging demand is generated based on the real-time battery status of the first engineering vehicle, and the charging demand of the first engineering vehicle is sent to the second engineering vehicle.

2. The intelligent charging method for electric engineering vehicles according to claim 1, characterized in that, The step of sending the first charging information of the first engineering vehicle to the second engineering vehicle and obtaining the second charging information of the second engineering vehicle includes: Obtain the resistance value of the charging signal and determine whether the resistance value of the charging signal is greater than the preset charging resistance value of the charging pile. If the charging resistance is greater than that of the charging pile, the system enters the intelligent charging mode, sends the first charging information of the first engineering vehicle to the battery management system of the second engineering vehicle, and obtains the second charging information sent by the battery management system of the second engineering vehicle. If the resistance is less than or equal to the charging resistance value of the charging pile, then the charging pile charging mode is entered. The first charging information includes the battery voltage platform V1 and the remaining battery charge SOC1 of the first engineering vehicle, and the second charging information includes the battery voltage platform V2 and the remaining battery charge SOC2 of the second engineering vehicle.

3. The intelligent charging method for electric engineering vehicles according to claim 2, characterized in that, The step of determining whether the first engineering vehicle is a charging vehicle based on the first charging information and the second charging information includes: Determine whether the remaining battery charge (SOC1) of the first engineering vehicle meets the following conditions: SOC1≥SOC0, and SOC1-SOC2>ΔSOC Where SOC0 is the preset remaining battery power threshold, and ΔSOC is the preset power difference threshold. If the conditions are met, then the first engineering vehicle is determined to be a power supply vehicle; If the conditions are not met, then the first engineering vehicle is determined to be a power supply vehicle.

4. The intelligent charging method for electric engineering vehicles according to claim 3, characterized in that, The step of intelligently replenishing the power of the second engineering vehicle according to its power replenishment needs includes: Obtain the dynamic charging demand and real-time battery status sent by the battery management system of the second engineering vehicle; The corresponding output current is determined based on the dynamic power replenishment requirements and the real-time battery status. Determine whether the battery voltage platform V1 of the first engineering vehicle is equal to the battery voltage platform V2 of the second engineering vehicle; If V1 < V2, then the battery voltage platform V1 is boosted to the battery voltage platform V2, and the second engineering vehicle is intelligently charged according to the output current. If V1 > V2, then the battery voltage platform V1 is stepped down to the battery voltage platform V2, and the second engineering vehicle is intelligently charged according to the output current; If V1=V2, then the second engineering vehicle is intelligently recharged based on the battery voltage platform V1 and the output current.

5. The intelligent charging method for electric engineering vehicles according to claim 4, characterized in that, Before obtaining the dynamic charging demand and real-time battery status sent by the battery management system of the second engineering vehicle, the method further includes: Step S1: Encrypt the preset first data using an encryption algorithm to obtain the second data, and send a first handshake message to the battery management system of the second engineering vehicle. The first handshake message includes the second data. Step S2: Determine whether a second handshake message sent by the battery management system of the second engineering vehicle is obtained within a first preset time period. The second handshake message includes third data parsed from the second data. Step S3: If the second handshake message is not obtained within the first preset time period, then repeat steps S1-S2 above. If steps S1-S2 are repeated a preset number of times and the second handshake message is still not obtained within the first preset time period, then stop power replenishment. Step S4: If the second handshake message is obtained within the first preset time period, determine whether the third data is consistent with the first data; Step S5: If they match, send a handshake verification success message to the battery management system of the second engineering vehicle so that the battery management system of the second engineering vehicle can send dynamic charging requirements and real-time battery status. Step S6: If they are inconsistent, repeat steps S1-S5. If steps S1-S5 are repeated a preset number of times and the third data is still inconsistent with the first data, then stop the power replenishment.

6. The intelligent charging method for electric engineering vehicles according to claim 5, characterized in that, Also includes: The power-up operation will terminate if any of the following is detected during the power-up process: The first engineering vehicle / the second engineering vehicle experienced a power supply failure. The power supply signal of the V2V power supply device is interrupted for a second preset duration; SOC1 < SOC0; SOC1 = SOC2.

7. A vehicle-to-vehicle (V2V) power supply device, characterized in that, include: The system comprises a first charging gun, a second charging gun, and a charging cable harness. The first charging gun is connected to the second charging gun via the charging cable harness. The first charging gun and the second charging gun have the same configuration. The charging harness includes a CC2 line, a CAN line, and a high-voltage line. The first end of the CC2 line is grounded, the second end is connected to the first charging gun through a first resistor, and the third end is connected to the second charging gun through a second resistor. The resistance values ​​of the first resistor and the second resistor are the same and greater than the charging resistance value of the charging pile. The first charging gun is equipped with a first switch, and the second charging gun is symmetrically equipped with a second switch. Both the first switch and the second switch are normally closed switches. When the first switch / second switch is turned on, the power supply signal of the V2V power supply device is interrupted.

8. A battery management system, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory is used to store computer-executed instructions; The processor is used to execute computer execution instructions stored in the memory, causing the processor to perform the intelligent power replenishment method for electric engineering vehicles as described in any one of claims 1-6.

9. An electric engineering vehicle, characterized in that, include: The battery management system as described in claim 8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the intelligent power replenishment method for the electric engineering vehicle according to any one of claims 1-6.

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