Power battery charging control method and system for mining electric vehicle

Abstract

The invention discloses a power battery charging control method and system for a mining electric drive vehicle, and the method comprises the steps: dividing a battery pack of the vehicle into two groups, carrying out the charging according to a charging mode corresponding to a current battery full-charge coefficient after the vehicle is connected with a charging power supply, carrying out the full-charge charging of the first group of batteries, and carrying out the full-charge charging of the second group of batteries; carrying out reserved capacity charging on the second group of batteries; and if the SOC values of the battery packs are all smaller than a preset first threshold value when the vehicle is connected to the charging power supply, after the two battery packs are charged, the state of the battery full-charge coefficient is switched, and during next charging, the first battery pack is subjected to reserved capacity charging, and the second battery pack is subjected to full-charge charging. According to the method, the vehicle power batteries are subjected to grouping control, the grouped power batteries are subjected to electric quantity reservation, and the batteries are subjected to full-charge charging and battery equalization in groups and times, so that the sufficient electric braking recovery capacity of the vehicle can be ensured, and the service life of the batteries is not shortened.

Description

Technical Field

[0001] This invention relates to the field of charging management technology, and in particular to a method and system for controlling the charging of power batteries in mining electric vehicles. Background Technology

[0002] To address the energy redundancy issue in regenerative braking, mining electric vehicles generally employ two methods. One method uses a braking resistor. Under strong regenerative conditions such as long slopes and heavy loads, when the battery cannot absorb the energy or the bus voltage is over-voltage, the excess electrical energy generated by the motor braking is rapidly dissipated as heat, ensuring that the motor's power is not reduced and the bus voltage does not exceed limits, and providing continuous electric braking capability in emergencies / power outages. However, this method has significant shortcomings in terms of weight, size, heat dissipation, and insulation.

[0003] The core component of a braking resistor is a high-power resistance wire (usually nickel-chromium alloy, iron-chromium-aluminum alloy, etc.). To meet the requirements of high power (hundreds of kilowatts are often required for mining trucks) and continuous operation, the resistance wire has a large diameter and long length, and requires a heavy metal shell (such as stainless steel) for protection and heat dissipation. A single braking resistor can weigh 50-200 kg. Mining wide-body trucks have a large load capacity, and the extra weight will directly increase tire wear and motor drive energy consumption. Especially in climbing conditions, more electrical energy is needed to overcome the weight, reducing the driving range. Uneven weight distribution may also affect the axle load ratio of the whole vehicle, and in extreme cases, it may destroy driving stability.

[0004] High-power braking resistors need to balance heat dissipation area and housing protection, resulting in a typically large size. For example, a 500kW braking resistor (including cooling system) in a 130t pure electric wide-body mining truck can take up 1-2 cubic meters of space. This not only occupies chassis space but also requires consideration of the impact of braking resistor heat dissipation on other components. Being mounted externally on the side of the frame increases wind resistance and makes it susceptible to impacts from mining debris. Since the braking resistor is directly connected to the high-voltage busbar, and mining trucks typically operate at 600V-1500V, its insulation performance is crucial for safety: strict insulation must be maintained between the resistance wire and the housing, and between the housing and the frame, with an insulation resistance of at least ≥100MΩ. However, the harsh mining environment can easily lead to insulation failure.

[0005] Another optimization method is to eliminate the vehicle's braking resistor and reserve the amount of energy needed for the longest downhill load during vehicle charging. This method not only eliminates the burden of the braking resistor on the vehicle but also ensures the vehicle's braking energy storage / consumption needs. For example, CN113147502A discloses a method for calculating the reserved empty capacity and required charging capacity of an explosion-proof electric vehicle in a coal mine before it goes down into the mine, maximizing the recovery of braking energy generated during the downhill process. However, if the power battery is not fully charged and its capacity is not balanced over a long period, it is difficult to ensure battery consistency and reduce the lifespan of the power battery.

[0006] In summary, existing methods for addressing braking energy using braking resistors or by reserving energy space by not fully charging the battery are insufficient to meet the higher requirements for control systems and vehicle lightweighting in the context of the high-speed development trend of mining vehicles. Summary of the Invention

[0007] Purpose of the invention: The purpose of this invention is to provide a method and system for charging the power battery of a mining electric vehicle, which can avoid the use of a braking resistor, ensure that the vehicle has sufficient electric braking force, and at the same time not affect the life of the power battery.

[0008] Technical solution: The power battery charging control method for mining electric drive vehicles described in this invention, after the vehicle is connected to the charging power supply, charges according to the charging mode corresponding to the current battery full charge coefficient until the current charging is completed; and determines the charging mode for the next charging based on the battery full charge coefficient switching strategy.

[0009] The vehicle's battery pack is divided into two groups, and the battery full charge coefficient includes two states. The first state of the battery full charge coefficient corresponds to the first charging method, and the second state of the battery full charge coefficient corresponds to the second charging method.

[0010] The first charging method is to fully charge the first group of batteries and charge the second group of batteries with reserved capacity; the second charging method is to charge the first group of batteries with reserved capacity and charge the second group of batteries with full capacity.

[0011] The battery full charge coefficient switching strategy includes: if the SOC values ​​of both the first group of batteries and the second group of batteries are less than a preset first threshold when the vehicle is connected to the charging power source, then the battery full charge coefficient state is switched after the first group of batteries and the second group of batteries have been charged; otherwise, the battery full charge coefficient state is not switched after charging is completed.

[0012] Furthermore, after fully charging the first or second battery group and completing the charging process, the battery voltage is balanced and the SOC value is calibrated.

[0013] Furthermore, the reserved capacity charging involves determining the target SOC value for charging based on a preset reserved target SOC value, and then charging according to the target SOC value.

[0014] Furthermore, the target SOC value is obtained by subtracting the reserved target SOC value from the full-charge SOC.

[0015] Furthermore, the first threshold is not greater than the reserved target SOC value.

[0016] Furthermore, the vehicle connects to the charging power source by inserting the charging gun, and the CC2 confirmation signal from the charging gun determines whether the vehicle is connected to the charging power source.

[0017] The power battery charging control system for the mining electric drive vehicle of the present invention includes:

[0018] The charging control unit is used to charge the vehicle according to the charging method corresponding to the current battery full charge coefficient after the vehicle is connected to the charging power source, until the current charging is completed; and to determine the charging method for the next charge according to the battery full charge coefficient switching strategy.

[0019] The vehicle's battery pack is divided into two groups, and the battery full charge coefficient includes two states. The first state of the battery full charge coefficient corresponds to the first charging method, and the second state of the battery full charge coefficient corresponds to the second charging method.

[0020] The first charging method is to fully charge the first group of batteries and charge the second group of batteries with reserved capacity; the second charging method is to charge the first group of batteries with reserved capacity and charge the second group of batteries with full capacity.

[0021] A battery full charge coefficient switching control unit is used to execute a battery full charge coefficient switching strategy. The battery full charge coefficient switching strategy includes: if the SOC values ​​of the first group of batteries and the second group of batteries are both less than a preset first threshold when the vehicle is connected to the charging power source, then the battery full charge coefficient state is switched after the first group of batteries and the second group of batteries have been charged; otherwise, the battery full charge coefficient state is not switched after charging is completed.

[0022] The electronic device of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded onto the processor, it implements the power battery charging control method for the mining electric drive vehicle.

[0023] The computer-readable storage medium of the present invention stores a computer program, which, when executed by a processor, implements the power battery charging control method for the mining electric drive vehicle.

[0024] The computer program product of the present invention includes a computer program that, when executed by a processor, implements the power battery charging control method for the mining electric drive vehicle.

[0025] Beneficial effects: Compared with the prior art, the advantages of the present invention are: (1) The present invention does not use a braking resistor, does not use additional components that consume vehicle braking energy, and does not increase the overall weight of the vehicle, thus reducing the risk of failure caused by adding electrical components. (2) The present invention controls the vehicle power battery in groups. According to the power consumption of the whole vehicle and the needs of the whole vehicle, the power battery in each group is reserved to ensure that the vehicle has sufficient electric braking recovery capacity; the other groups are fully charged and balanced. The power battery can be balanced by active and passive balancing in stages to calibrate the power battery SOC, protect the consistency of the battery, and ensure that the battery life is not affected. (3) The present invention will only change the charging method when the vehicle power discharges to a certain extent, that is, when the initial SOC value is lower than a certain threshold. In other words, the present invention takes into account that when the power battery discharges less, it will generally not affect the accuracy of the battery SOC value and the consistency of the battery, so it does not change the charging method. When the power battery reaches a certain depth of discharge below a certain threshold, it is necessary to change the charging method to balance and fully charge the batteries that did not reach 100% in the previous charge; it can extend the battery cycle life and take into account both charging efficiency and battery health. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the battery full charge coefficient switching strategy according to an embodiment of the present invention.

[0027] Figure 2 This is a discharge characteristic curve of the power battery according to an embodiment of the present invention.

[0028] Figure 3 This is a simulation diagram of the power battery charging and discharging model according to an embodiment of the present invention.

[0029] Figure 4 This is a simulation structure diagram of the charging control system according to an embodiment of the present invention.

[0030] Figure 5 The figure shows the simulation results of the charge and discharge state of battery pack A in Experiment 1 of this invention.

[0031] Figure 6 The figure shows the simulation results of the charge and discharge state of battery pack B in Experiment 1 of this invention.

[0032] Figure 7 The figure shows the simulation results of the charge and discharge state of battery pack A in Experiment 2 of this invention.

[0033] Figure 8 The figure shows the simulation results of the charge and discharge state of battery pack B in Experiment 2 of this invention.

[0034] Figure 9 The figure shows the simulation results of the charge and discharge state of battery pack A in Experiment 3 of this invention.

[0035] Figure 10 The figure shows the simulation results of the charge and discharge state of battery pack B in Experiment 3 of this invention. Detailed Implementation

[0036] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0037] like Figure 1 As shown, the power battery charging control method for the mining electric vehicle includes the following steps.

[0038] After the vehicle is connected to the charging power source, it will be charged according to the charging method corresponding to the current battery full charge coefficient until the current charging is completed; the charging method for the next charge will be determined according to the battery full charge coefficient switching strategy.

[0039] The vehicle's battery pack is divided into two groups, and the battery full charge coefficient includes two states. The first state of the battery full charge coefficient corresponds to the first charging method, and the second state of the battery full charge coefficient corresponds to the second charging method.

[0040] The first charging method is to fully charge the first group of batteries and charge the second group of batteries with reserved capacity; the second charging method is to charge the first group of batteries with reserved capacity and charge the second group of batteries with full capacity.

[0041] The battery full charge coefficient switching strategy includes: if the SOC values ​​of both the first group of batteries and the second group of batteries are less than a preset first threshold when the vehicle is connected to the charging power source, then the battery full charge coefficient state is switched after the first group of batteries and the second group of batteries have been charged; otherwise, the battery full charge coefficient state is not switched after charging is completed.

[0042] Mining vehicles are equipped with large-capacity power batteries, generally requiring two or more battery packs. Therefore, in this embodiment, the batteries equipped in the vehicle are divided into two groups, namely battery pack A and battery pack B. During charging, the power reserve is made according to the vehicle's reserved power target value to ensure sufficient capacity for energy recovery.

[0043] Specifically, the battery full charge coefficient is either 1 or 2. This coefficient records the charging state at the time of the last charge. After the vehicle is connected to the charging power source, if the full charge coefficient is 1, battery pack A is charged to 100% SOC, and battery voltage equalization and SOC calibration are performed; battery pack B is charged to the target SOC value, and charging of battery pack B stops when the target SOC value is reached. If the full charge coefficient is 2, battery pack B is charged to 100% SOC, and battery voltage equalization and SOC calibration are performed; battery pack A is charged to the target SOC value, and charging of battery pack A stops when the target SOC value is reached.

[0044] In some optional embodiments, the driver inputs the reserved capacity through the vehicle control panel according to the actual working conditions, and calculates the SOC value of the corresponding single power battery pack through the battery power parameter model. The reserved value is then subtracted from the SOC of 100% full charge to obtain the SOC target value of the reserved capacity battery pack.

[0045] In some optional embodiments, the reserved capacity can be 40% SOC.

[0046] Specifically, the initial value of the full charge coefficient is 1, and this value is not reset during system initialization. After the charging gun is plugged in, the system determines whether to switch the battery full charge coefficient after charging is complete, based on the battery full charge coefficient switching strategy. Whether to switch determines the charging method for the next charging cycle. The conditions for changing the battery full charge coefficient are: the charging gun is plugged in, both battery pack A and battery pack B are below the preset threshold, and charging and battery voltage balancing are completed before the battery full charge coefficient is changed.

[0047] Specifically, the preset threshold is no greater than the SOC target value of the reserved capacity battery pack.

[0048] In some optional embodiments, the power battery will typically limit power and prompt charging when the SOC discharges to 20%. Therefore, the preset threshold can be a value not lower than 20% SOC, for example, the preset threshold can be 50% SOC.

[0049] Specifically, refer to Figure 1 The battery full charge coefficient switching strategy includes the following steps: When the charging system starts running, it reads the full charge coefficient value of the power battery and then determines whether to plug in the charging gun. This can be determined based on the CC2 signal of the fast charging gun. If no charging gun is plugged in, it returns to the waiting program for the next loop. If the charging gun is plugged in, it checks whether the SOC values ​​of both power battery pack A and battery pack B are less than a preset threshold. If the condition is not met, the full charge coefficient of the power battery is not changed, and it returns to the waiting program for the next loop. If the condition is met, the battery status is monitored, and the battery waits for charging to complete. If charging is not completed, the full charge coefficient of the power battery is not changed. If both battery packs are fully charged, the full charge coefficient of the battery is changed. When the full charge coefficient of the battery is 1, it is changed to 2; when the full charge coefficient of the battery is 2, it is changed to 1.

[0050] In some optional embodiments, the step of determining whether the SOC values ​​of both power battery pack A and battery pack B are less than 50% can also be performed after charging is completed.

[0051] In some optional embodiments, in order to implement the power battery charging control method for mining electric drive vehicles described in this invention, the following key parameters can be obtained from the vehicle, as shown in Table 1.

[0052] Table 1 Required Parameters

[0053]

[0054] Specifically, based on the parameters shown in Table 1, the charging system uses the SOC value of battery pack A, the SOC value of battery pack B, and the vehicle fast charging confirmation signal to determine the battery full charge coefficient using a battery full charge coefficient switching strategy. It also determines whether to modify the battery full charge coefficient upon completion of charging. Initially, the system reads the battery full charge coefficient and begins charging the battery. The target charging capacity is set to 100%. When the reserved capacity battery reaches the SOC target value of the reserved capacity battery pack, the charging power of that battery pack is calculated based on the battery pack bus voltage and current at that moment. The BMS requests power from the DC fast charger to reduce the power of that battery pack, and the system stops charging that battery pack through the control circuit. Another battery pack is charged to the target charging capacity value of 100%. After the battery pack completes battery balancing and SOC calibration, the battery pack SOC jumps to 100%, completing the charging process. The system then modifies the power battery full charge coefficient. The system will then determine the SOC target value and charging capacity target value of the reserved capacity battery packs of battery pack A and battery pack B for the next charging cycle.

[0055] The method described in this invention will be verified through specific simulation experiments below.

[0056] This simulation establishes a power battery model for mining vehicles based on the lithium iron phosphate batteries commonly used in mining vehicles and the power battery pack parameters shown in Table 2. Based on the battery characteristics, the simulation produces the power battery discharge characteristic curves, such as... Figure 2 As shown. Figure 2 In the diagram, the horizontal axis represents time, the vertical axis represents voltage, and the curve represents current. The yellow area represents the initial voltage drop phase, the gray area represents the voltage stable discharge phase, and the white area represents the voltage drop phase. The gray area characteristics are used to calculate the charge and battery SOC value.

[0057] Table 2 Parameters of the Power Battery Pack

[0058]

[0059] This simulation establishes a battery charging and discharging model using MATLAB / Simulink. The vehicle's reserved capacity is set to 40kWh, the target charging capacity is 100%, and the vehicle's fast charging confirmation signal is set to 1 for validity and 0 for invalidity. The correspondence between the required parameters and the model signal names is shown in Table 3. The battery model is used to construct high-power discharge and plug-in charging conditions for the entire vehicle, simulating the charging and discharging state of the power battery. Figure 3 and Figure 4As shown, it can be used to observe the voltage and current states of battery charging and discharging. Adding a battery charging and discharging control strategy can verify whether the charging control method meets the expected design of the strategy under different states. Figure 3 and Figure 4 In this context, Battery_discharge_control is the battery discharge control signal for vehicle operation; Battery_charge_control is the battery charging control signal; Battery_control_1 is the battery pack A switch control signal; Battery_control_2 is the battery pack B switch control signal; the battery pack switch control signals are output from the control strategy model to the vehicle model, and the state values ​​are determined and controlled according to the control strategy; the battery charging and discharging control signals are time state quantities, simulating the working state of the vehicle during operation, parking, and charging.

[0060] Table 3. Correspondence between Demand Parameters and Model Signals

[0061] Serial Number name Model signal name 1 Battery pack A SOC value B24H_01_SOC 2 Battery pack A bus voltage B24H_01_Vol 3 Battery pack A bus current B24H_01_Cur 4 Battery pack B SOC value B24H_02_SOC 5 Battery pack B bus voltage B24H_02_Vol 6 Battery pack B bus current B24H_02_Cur 7 Vehicle reserved capacity SOC_Reserve_Target 8 Fast charging confirmation signal for the whole vehicle CC2 9 Target charging capacity SOC_Targe

[0062] Experiment 1: Verification of the charging and discharging method for energy-reserved charging control in mining vehicles

[0063] The charging and discharging control method for energy reserve in mining vehicles was verified. A target reserve of 40% SOC was set, and the full charge threshold was set when the SOC of all battery packs was below 50%. Battery pack A had an initial SOC of 70%, and battery pack B had an initial SOC of 65%. The system simulated constant speed operation for 2000 seconds, followed by a 200-second stop, and then plug-in charging. The charging and discharging states of battery packs A and B were as follows: Figure 5 and Figure 6 As shown in the attached diagrams for charge / discharge states, the upper diagram shows the change in the battery pack's bus voltage, and the lower diagram shows the change in the battery pack's SOC value. You can view the voltage and SOC states at the same time; for example, after charging to the target SOC, the SOC remains unchanged, and the bus voltage remains stable.

[0064] Analysis of the battery pack's charge and discharge status shows that after 2000 seconds of vehicle operation, the SOC value of battery pack A dropped to 47.2%, and the SOC value of battery pack B dropped to 44.8%. Based on the full charge coefficient jump value being below 50%, and the battery packs having completed charging, battery pack A was fully charged, and battery pack B was charged to 60% SOC, with the full charge coefficient changing from 1 to 2. When both batteries are discharged to more than 50%, the next charging cycle will involve fully charging battery pack B and performing battery equalization to calibrate its SOC value, while battery pack A will be charged to 60% SOC, which aligns with the control system design expectations.

[0065] Experiment 2: Verification of the Reserved Capacity Discharge and Recharge Control Method for Energy Reserved Charging in Mining Vehicles

[0066] The verification of the energy reserve charging control system for mining vehicles was performed by discharging the battery after charging was completed, reducing the battery level to below 50%, and then recharging. A target reserve of 40% SOC was set, with the full charge threshold set when the battery pack SOC values ​​were all below 50%. Battery pack A had an initial SOC of 100%, and battery pack B had an initial SOC of 60%. The system simulated the vehicle running at a constant speed for 3500 seconds, then stopping for 200 seconds, before resuming charging. The battery pack charging and discharging states were as follows: Figure 7 and Figure 8 As shown.

[0067] Analysis of the battery pack's charge and discharge states shows that after 3500 seconds of vehicle operation, the SOC value of battery pack A decreased from 100% to 47.5%, and the SOC value of battery pack B decreased from 60% to 37.2%. Based on the jump value of the full charge coefficient being below 50%, and the completion of battery pack charging, battery pack A stopped charging at 60%, while battery pack B was charged to 100% SOC. When both batteries discharged more than 50%, the next charging cycle will involve fully charging battery pack A and performing battery equalization to calibrate its SOC value, while battery pack B will be charged to 60% SOC, which aligns with the control system design expectations.

[0068] Experiment 3: Verification of the Energy Reserved Charging Control Method for Mining Vehicles without Reserved Charging

[0069] When verifying the energy reserve charging control system of the mining vehicle, if there is no charging reserve requirement (i.e., the vehicle does not experience long downhill driving and there is no need to reserve braking energy recovery space for the battery), the driver sets the target reserve to 0, the vehicle discharges, and then charges. Battery pack A has an initial SOC of 100%, and battery pack B has an initial SOC of 60%. The system simulates the vehicle running at a constant speed for 2000 seconds, then stopping for 200 seconds, before plugging in charging. The battery pack charging and discharging states are as follows: Figure 9 and Figure 10 As shown.

[0070] Analysis of the battery pack's charge and discharge status shows that, with the target reserved capacity set to 0, after 2000 seconds of vehicle operation, the SOC value of battery pack A decreased from 100% to 68.2%, and the SOC value of battery pack B decreased from 60% to 48.6%. During the next charge, both battery packs A and B will be fully charged and battery balancing will be performed, which is in line with the design expectations of the control system.

[0071] The power battery charging control system for the mining electric drive vehicle of the present invention includes:

[0072] The charging control unit is used to charge the vehicle according to the charging method corresponding to the current battery full charge coefficient after the vehicle is connected to the charging power source, until the current charging is completed; and to determine the charging method for the next charge according to the battery full charge coefficient switching strategy.

[0073] The vehicle's battery pack is divided into two groups, and the battery full charge coefficient includes two states. The first state of the battery full charge coefficient corresponds to the first charging method, and the second state of the battery full charge coefficient corresponds to the second charging method.

[0074] The first charging method is to fully charge the first group of batteries and charge the second group of batteries with reserved capacity; the second charging method is to charge the first group of batteries with reserved capacity and charge the second group of batteries with full capacity.

[0075] A battery full charge coefficient switching control unit is used to execute a battery full charge coefficient switching strategy. The battery full charge coefficient switching strategy includes: if the SOC values ​​of the first group of batteries and the second group of batteries are both less than a preset first threshold when the vehicle is connected to the charging power source, then the battery full charge coefficient state is switched after the first group of batteries and the second group of batteries have been charged; otherwise, the battery full charge coefficient state is not switched after charging is completed.

[0076] The electronic device of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded onto the processor, it implements the power battery charging control method for the mining electric drive vehicle.

[0077] The computer-readable storage medium of the present invention stores a computer program, which, when executed by a processor, implements the power battery charging control method for the mining electric drive vehicle.

[0078] The computer program product of the present invention includes a computer program that, when executed by a processor, implements the power battery charging control method for the mining electric drive vehicle.

[0079] The computer-readable storage medium may include RAM, ROM, EEPROM, CD-ROM or other optical disc storage devices, magnetic disk storage devices or other magnetic storage devices, flash memory or any other medium that can be used to store program code in the form of instructions or data structures and is accessible by a computer.

[0080] The processor is used to execute a computer program stored in memory to implement the various steps in the methods described in the above embodiments.

Claims

1. A method for controlling the charging of a power battery in a mining electric vehicle, characterized in that, After the vehicle is connected to the charging power source, it will be charged according to the charging method corresponding to the current battery full charge coefficient until the current charging is completed; the charging method for the next charge will be determined according to the battery full charge coefficient switching strategy. The vehicle's battery pack is divided into two groups, and the battery full charge coefficient includes two states. The first state of the battery full charge coefficient corresponds to the first charging method, and the second state of the battery full charge coefficient corresponds to the second charging method. The first charging method is to fully charge the first group of batteries and charge the second group of batteries with reserved capacity. The second charging method is to charge the first group of batteries with reserved capacity and charge the second group of batteries to full capacity. The battery full charge coefficient switching strategy includes: if the SOC values ​​of both the first group of batteries and the second group of batteries are less than a preset first threshold when the vehicle is connected to the charging power source, then the battery full charge coefficient state is switched after the first group of batteries and the second group of batteries have been charged; otherwise, the battery full charge coefficient state is not switched after charging is completed.

2. The power battery charging control method for a mining electric vehicle according to claim 1, characterized in that, After fully charging the first or second battery group and completing the charging process, perform battery voltage equalization and calibrate the SOC value.

3. The power battery charging control method for a mining electric vehicle according to claim 1, characterized in that, The reserved capacity charging method involves determining the target SOC value for charging based on a preset reserved target SOC value, and then charging according to the target SOC value.

4. The power battery charging control method for a mining electric vehicle according to claim 1, characterized in that, The target SOC value is obtained by subtracting the reserved target SOC value from the full-charge SOC.

5. The power battery charging control method for a mining electric vehicle according to claim 3, characterized in that, The first threshold is not greater than the reserved target SOC value.

6. The power battery charging control method for a mining electric vehicle according to claim 1, characterized in that, The vehicle connects to the charging power source by inserting the charging gun, and the CC2 confirmation signal from the charging gun determines whether the vehicle is connected to the charging power source.

7. A power battery charging control system for a mining electric vehicle, characterized in that, include: The charging control unit is used to charge the vehicle according to the charging method corresponding to the current battery full charge coefficient after the vehicle is connected to the charging power source, until the current charging is completed; and to determine the charging method for the next charge according to the battery full charge coefficient switching strategy. The vehicle's battery pack is divided into two groups, and the battery full charge coefficient includes two states. The first state of the battery full charge coefficient corresponds to the first charging method, and the second state of the battery full charge coefficient corresponds to the second charging method. The first charging method is to fully charge the first group of batteries and charge the second group of batteries with reserved capacity. The second charging method is to charge the first group of batteries with reserved capacity and charge the second group of batteries to full capacity. A battery full charge coefficient switching control unit is used to execute a battery full charge coefficient switching strategy. The battery full charge coefficient switching strategy includes: if the SOC values ​​of the first group of batteries and the second group of batteries are both less than a preset first threshold when the vehicle is connected to the charging power source, then the battery full charge coefficient state is switched after the first group of batteries and the second group of batteries have been charged; otherwise, the battery full charge coefficient state is not switched after charging is completed.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the computer program is loaded into the processor, it implements the power battery charging control method for mining electric drive vehicles according to any one of claims 1-6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the power battery charging control method for mining electric drive vehicles according to any one of claims 1-6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the power battery charging control method for mining electric drive vehicles according to any one of claims 1-6.

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