A battery pack power balance control circuit for an electric-wheel dump truck

Abstract

The present invention discloses a battery pack power balance control circuit for an electric-wheel dump truck, which relates to the technical field of battery packs. The circuit includes a micro-control module. According to the power states of the first battery module, the second battery module, and the third battery module, during the discharging operation, it supplies power to the electric wheels and auxiliary equipment of the electric-wheel dump truck respectively, and can maintain the balanced power supply operation of the first battery module and the second battery module through the third battery module. During the stop of the discharging operation, according to the power states of the first battery module, the second battery module, and the third battery module, it can cooperate with the balance interaction module to realize the power charge and discharge control among the first battery module, the second battery module, and the third battery module, and perform balance adjustment processing on the first battery module, the second battery module, and the third battery module. The battery pack power balance control circuit for the electric-wheel dump truck of the present invention can improve the power utilization rate of the three battery modules and the endurance of the three battery modules.

Description

Technical Field

[0001] The invention relates to the technical field of battery packs, in particular to an electric wheel dump truck battery pack power balance control circuit. Background Art

[0002] The ‌Electric Wheel Dump Truck‌ is a heavy-duty dump truck that uses electricity to drive. It is mainly used in places such as mines and construction sites that require a large amount of material to be transported and dumped. The ‌Electric Wheel Dump Truck‌ in the prior art has two motors driving the rear wheels, each motor corresponds to an electric wheel, and each electric wheel is independently powered by a group of battery packs. In addition, an auxiliary battery pack is used to power auxiliary equipment such as the steering pump, lifting pump, and cooling system on the vehicle. However, each battery pack is individually charged and discharged. When the battery pack supplies power to the electric wheel, due to different discharge efficiencies, an imbalance in power is likely to occur, which in turn leads to different endurance of the battery pack of the electric wheel. In addition, due to the different workloads of the battery packs and the inability to exchange power between the auxiliary battery pack and the battery pack of the electric wheel, the power supply efficiency of the battery pack is low, so it needs to be improved. Summary of the invention

[0003] An embodiment of the present invention provides a battery pack power balance control circuit for an electric wheel dump truck to solve the problems raised in the above background technology.

[0004] According to an embodiment of the present invention, a battery pack power balance control circuit for an electric wheel dump truck is provided, comprising:

[0005] a first battery module, connected to the microcontrol module and the balancing interaction module, and used to store the second electric energy output by the balancing interaction module, store the first electric energy output by the balancing interaction module when receiving the first energy storage signal output by the microcontrol module, release the stored electric energy and provide the third electric energy, and adjust the third electric energy and output the first balancing electric energy when receiving the first discharge signal output by the microcontrol module;

[0006] a second battery module, connected to the micro-control module, the connection control module and the balancing interaction module, and used to store the sixth electric energy output by the connection control module, store the first electric energy output by the balancing interaction module when receiving the second energy storage signal output by the micro-control module, release the stored electric energy and provide the fourth electric energy, and adjust the fourth electric energy and output the second balancing electric energy when receiving the second discharge signal output by the micro-control module;

[0007] The micro-control module, connected to the third battery module, is used to sample the voltages of the first battery module, the second battery module, and the third battery module and output the first voltage signal, the second voltage signal, and the third voltage signal respectively. During the operation of the dump truck, it outputs the first working signal, the second working signal, and the third working signal. When the first voltage signal is lower than the second voltage signal, it outputs the first compensation signal. When the first voltage signal is lower than the second voltage signal, it outputs the second compensation signal. During the period when the dump truck stops working, when the first voltage signal is equal to the second voltage signal and both are lower than the third voltage signal, it outputs the total equalization signal and the third discharge signal. When the first voltage signal is greater than the second voltage signal and greater than the third voltage signal, it outputs the first discharge signal and the third energy storage signal. When the second voltage signal is greater than the first voltage signal and greater than the third voltage signal, it outputs the second discharge signal and the third energy storage signal. When the third voltage signal is greater than the first voltage signal and greater than the second voltage signal, it outputs the third discharge signal and the second energy storage signal. When the third voltage signal is greater than the second voltage signal and greater than the first voltage signal, it outputs the third discharge signal and the first energy storage signal. When the third voltage signal is lower than the set voltage threshold, it stops the discharge operation and outputs the total equalization signal. According to the voltage magnitude between the first voltage signal and the second voltage signal, it outputs the first discharge signal or the second discharge signal and controls the voltage equalization of the first battery module and the second battery module;

[0008] The equalization interaction module, connected to the micro-control module and the third battery module, is used to isolate and transform the first equalization electric energy or the second equalization electric energy and output the third equalization electric energy and store the third equalization electric energy, isolate and transform the fifth electric energy output by the third battery module and output the first electric energy. When receiving the total equalization signal, it performs transmission control on the third equalization electric energy or the fifth electric energy output by the third battery module and provides the second electric energy;

[0009] The third battery module is used to rectify and store the third equalization electric energy when receiving the third charging signal, and release the stored electric energy and provide the fifth electric energy when receiving the third discharge signal;

[0010] The connection control module, connected to the micro-control module and the first battery module, is used to control the first battery module and the second battery module to be connected in series and output the sixth electric energy when the first working signal or the second working signal is not received.

[0011] As a further solution of the present invention: The battery pack power balance control circuit of the electric-wheel dump truck further includes a first power supply module, a second power supply module, and a third power supply module;

[0012] Preferably, the first power supply module is connected to the micro-control module, the first battery module, and the third battery module, and is configured to transmit the third electric energy to the electric wheels of the connected battery-powered dump truck when receiving the first working signal, and to superimpose the fifth electric energy on the third electric energy and supply power to the electric wheels when receiving the first compensation signal;

[0013] The second power supply module is connected to the micro-control module, the second battery module, and the third battery module, and is configured to transmit the fourth electric energy to the electric wheels of the connected battery-powered dump truck when receiving the second working signal, and to superimpose the fifth electric energy on the fourth electric energy and supply power to the electric wheels when receiving the second compensation signal;

[0014] The third power supply module is connected to the third battery module and the micro-control module, and is configured to transmit the fifth electric energy to the auxiliary equipment of the connected battery-powered dump truck when receiving the third working signal.

[0015] As a further aspect of the present invention: the first battery module includes a first inductor, a first resistor, a third power transistor, a second power transistor, and a first battery pack; the micro-control module includes a first controller; the equalization interaction module includes a first transformer and a second thyristor;

[0016] Preferably, the first end of the first battery pack is connected to the cathode of the second thyristor and sequentially connected to the first end of the first primary side of the first transformer through the first inductor and the first resistor. The second end of the first primary side of the first transformer is connected to the source of the third power transistor. The drain of the third power transistor is connected to the drain of the second power transistor. The source of the second power transistor is connected to the second end of the first battery pack. The gates of the third power transistor, the second power transistor, and the control terminal of the second thyristor are respectively connected to the IO3 terminal, the IO2 terminal, and the IO12 terminal of the first controller. The anode of the second thyristor is connected to the first end of the secondary side of the first transformer.

[0017] As a further aspect of the present invention: the second power supply module includes a fourth inductor, a sixth power transistor, a seventh power transistor, a third resistor, and a second battery pack; the connection control module includes a first thyristor, a first inverter, a fourth diode, and a fifth diode;

[0018] Preferably, the first end of the second battery pack is connected to one end of the first thyristor and is sequentially connected to the first end of the second primary side of the first transformer through the third resistor and the fourth inductor. The source electrode of the sixth power tube is connected to the second end of the second primary side of the first transformer. The drain electrode of the sixth power tube is connected to the drain electrode of the seventh power tube. The source electrode of the seventh power tube is connected to the second end of the second battery pack. The output end of the first inverter is connected to the control end of the first thyristor. The other end of the first thyristor is connected to the second end of the first battery pack. The input end of the first inverter is connected to the cathodes of the fourth diode and the fifth diode. The anode of the fourth diode, the gate electrode of the sixth power tube, and the gate electrode of the seventh power tube are respectively connected to the IO1 terminal, the IO6 terminal, and the IO7 terminal of the first controller. The anode of the fifth diode is connected to the second power supply module.

[0019] As a further solution of the present invention: the third battery module includes a second resistor, a third inductor, a fourth power tube, a fifth power tube, and a third battery pack; the micro control module further includes a first detection device and a second detection device; the equalization interaction module further includes a second inductor;

[0020] Preferably, the source electrode of the fourth power tube is connected to the first end of the secondary side of the first transformer and is connected to the second end of the secondary side of the first transformer and one end of the second resistor through the second inductor. The other end of the second resistor is connected to the second end of the third battery pack through the third inductor. The drain electrode of the fourth power tube is connected to the drain electrode of the fifth power tube. The source electrode of the fifth power tube is connected to the first end of the third battery pack and the input end of the second detection device. The output end of the second detection device, the gate electrode of the fourth power tube, and the gate electrode of the fifth power tube are respectively connected to the IO14 terminal, the IO4 terminal, and the IO5 terminal of the first controller. The first input end and the second input end of the first detection device are respectively connected to the first end and the first end of the second battery pack of the first battery pack. The output end of the first detection device is connected to the IO13 terminal of the first controller.

[0021] As a further solution of the present invention: the first power supply module includes a first power tube, a first capacitor, a first diode, a second diode, a third diode, a second capacitor, an eighth power tube, and a first motor interface;

[0022] Preferably, the drain electrode of the first power tube is connected to the first end of the first battery pack. The source electrode of the first power tube is connected to the anode of the second diode and one end of the second capacitor and is connected to the anode of the first diode and the source electrode of the eighth power tube through the first capacitor. The cathode of the first diode is connected to the cathode of the second diode and the first end of the first motor interface. The other end of the second capacitor is connected to the cathode of the third diode and the second end of the first motor interface. The anode of the third diode is connected to the second end of the first battery pack. The drain electrode of the eighth power tube is connected to the first end of the third battery pack. The gate electrode of the eighth power tube and the gate electrode of the first power tube are respectively connected to the IO8 terminal and the IO1 terminal of the first controller.

[0023] As a further solution of the present invention: The second power supply module includes a ninth power transistor, an output regulating device, a second motor interface, and a tenth power transistor;

[0024] Preferably, the drain of the ninth power transistor is connected to the first end of the third battery pack, the source of the ninth power transistor is connected to the second input end of the output regulating device, the first input end of the output regulating device is connected to the source of the tenth power transistor, the drain of the tenth power transistor is connected to the first end of the second battery pack, the output end of the output regulating device is connected to the first end of the second motor interface, the second end of the second motor interface is connected to the ground end of the output regulating device, the second end of the second battery pack, and the second end of the third battery pack, and the gates of the ninth power transistor and the tenth power transistor are respectively connected to the IO9 end and the IO10 end of the first controller.

[0025] As a further solution of the present invention: The third power supply module includes an eleventh power transistor, a third capacitor, and an auxiliary power supply interface;

[0026] Preferably, the drain of the eleventh power transistor is connected to the first end of the third battery pack, the source of the eleventh power transistor is connected to the first end of the auxiliary power supply interface and is connected to the second end of the third battery pack and the second end of the auxiliary power supply interface through the third capacitor, and the gate of the eleventh power transistor is connected to the IO11 end of the first controller.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: The battery pack power balance control circuit of the electric wheel dump truck of the present invention, according to the power states of the first battery module, the second battery module, and the third battery module through the micro-control module, when discharging, supplies power to the electric wheels and auxiliary equipment of the electric wheel dump truck through the first power supply module, the second power supply module, and the third power supply module respectively, and can maintain the balanced power supply of the first battery module and the second battery module through the third battery module. When stopping discharging, it can also, according to the power states of the first battery module, the second battery module, and the third battery module, cooperate with the balance interaction module to realize the power charging and discharging control between the first battery module, the second battery module, and the third battery module, perform balance adjustment processing on the first battery module, the second battery module, and the third battery module, and improve the power utilization rate of the three battery modules and the endurance of the three battery modules. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1It is a schematic block diagram of the principle of a battery pack power balance control circuit for an electric-wheel dump truck provided by an embodiment of the present invention.

[0030] Figure 2 It is a circuit diagram of a battery pack power balance control circuit for an electric-wheel dump truck provided by an embodiment of the present invention.

[0031] Figure 3 It is a circuit diagram of a second power supply module provided by an embodiment of the present invention.

[0032] Figure 4 It is a circuit diagram of a third power supply module provided by an embodiment of the present invention. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] In one embodiment, please refer to Figure 1 , an electric-wheel dump truck battery pack power balance control circuit includes:

[0035] Specifically, a first battery module 1 is connected to a micro-control module 3 and an equalization interaction module 4, and is used to store the second electric energy output by the equalization interaction module 4, store the first electric energy output by the equalization interaction module 4 when receiving the first energy storage signal output by the micro-control module 3, release the stored electric energy and provide the third electric energy, and adjust the third electric energy and output the first equalized electric energy when receiving the first discharge signal output by the micro-control module 3;

[0036] A second battery module 2 is connected to the micro-control module 3, a connection control module 6 and the equalization interaction module 4, and is used to store the sixth electric energy output by the connection control module 6, store the first electric energy output by the equalization interaction module 4 when receiving the second energy storage signal output by the micro-control module 3, release the stored electric energy and provide the fourth electric energy, and adjust the fourth electric energy and output the second equalized electric energy when receiving the second discharge signal output by the micro-control module 3;

[0037] The micro-control module 3, connected to the third battery module 5, is used to perform voltage sampling on the first battery module 1, the second battery module 2, and the third battery module 5 and output a first voltage signal, a second voltage signal, and a third voltage signal respectively. During the operation of the dump truck, it outputs a first working signal, a second working signal, and a third working signal. When the first voltage signal is lower than the second voltage signal, it outputs a first compensation signal. When the first voltage signal is lower than the second voltage signal, it outputs a second compensation signal. During the period when the dump truck stops working, when the first voltage signal is equal to the second voltage signal and both are lower than the third voltage signal, it outputs a total equalization signal and a third discharge signal. When the first voltage signal is greater than the second voltage signal and greater than the third voltage signal, it outputs a first discharge signal and a third energy storage signal. When the second voltage signal is greater than the first voltage signal and greater than the third voltage signal, it outputs a second discharge signal and a third energy storage signal. When the third voltage signal is greater than the first voltage signal and greater than the second voltage signal, it outputs a third discharge signal and a second energy storage signal. When the third voltage signal is greater than the second voltage signal and greater than the first voltage signal, it outputs a third discharge signal and a first energy storage signal. When the third voltage signal is lower than the set voltage threshold, it stops the discharge operation and outputs a total equalization signal, and outputs a first discharge signal or a second discharge signal according to the voltage magnitude between the first voltage signal and the second voltage signal and controls the voltage equalization of the first battery module 1 and the second battery module 2;

[0038] The equalization interaction module 4, connected to the micro-control module 3 and the third battery module 5, is used to isolate and transform the first equalization electric energy or the second equalization electric energy and output the third equalization electric energy and store the third equalization electric energy, perform isolation transformation processing on the fifth electric energy output by the third battery module 5 and output the first electric energy, and perform transmission control on the third equalization electric energy or the fifth electric energy output by the third battery module 5 and provide the second electric energy when receiving the total equalization signal;

[0039] The third battery module 5 is used to rectify and store the third equalization electric energy when receiving the third charging signal, and release the stored electric energy and provide the fifth electric energy when receiving the third discharge signal;

[0040] The connection control module 6, connected to the micro-control module 3 and the first battery module 1, is used to control the first battery module 1 and the second battery module 2 to be connected in series and output the sixth electric energy when the first working signal or the second working signal is not received.

[0041] Furthermore, the battery pack power balance control circuit of the electric-wheel dump truck further includes a first power supply module 7, a second power supply module 8, and a third power supply module 9;

[0042] Specifically, the first power supply module 7 is connected to the micro-control module 3, the first battery module 1, and the third battery module 5. When receiving the first working signal, it transmits the third electric energy to the electric wheels of the connected electric-wheel dump truck. When receiving the first compensation signal, it superimposes the fifth electric energy and the third electric energy and supplies power to the electric wheels.

[0043] The second power supply module 8 is connected to the micro-control module 3, the second battery module 2, and the third battery module 5. When receiving the second working signal, it transmits the fourth electric energy to the electric wheels of the connected electric-wheel dump truck. When receiving the second compensation signal, it superimposes the fifth electric energy and the fourth electric energy and supplies power to the electric wheels.

[0044] The third power supply module 9 is connected to the third battery module 5 and the micro-control module 3. When receiving the third working signal, it transmits the fifth electric energy to the auxiliary equipment of the connected electric-wheel dump truck.

[0045] In a specific embodiment, the above-mentioned first battery module 1 can adopt a first battery circuit composed of a battery pack, an inductor, a field effect transistor, etc., and can perform energy storage and discharge control; the above-mentioned second battery module 2 can adopt a first battery circuit composed of a battery pack, an inductor, a field effect transistor, etc., and can perform energy storage and discharge control; the above-mentioned micro-control module 3 can adopt a micro-control circuit composed of a detection device and a single-chip microcomputer. The detection device performs voltage sampling, voltage difference detection, and voltage magnitude comparison. The single-chip microcomputer integrates many components such as an arithmetic unit, a controller, a memory, and an input / output device, and realizes functions such as signal processing, data storage, module control, and timing control; the above-mentioned equalization interaction module 4 can adopt an equalization interaction circuit composed of a transformer, an inductor, and a diode, and can realize isolation voltage transformation, energy storage, and electric energy transmission control, and realize the electric energy equalization control of the first battery module 1, the second battery module 2, and the third battery module 5; the above-mentioned third battery module 5 can adopt a third battery circuit composed of a battery pack, a field effect transistor, an inductor, etc., and can perform energy storage and discharge control; the above-mentioned connection control module 6 can adopt a connection control circuit composed of a thyristor, an inverter, and a diode, and can control the first battery module 1 and the second battery module 2 to be connected in series; the above-mentioned first power supply module 7 can adopt a first power supply circuit composed of a field effect transistor, a capacitor, a diode, etc., and can control the first battery module 1 to discharge, and perform superposition compensation processing on the electric energy released by the first battery module 1 and the electric energy released by the third battery module 5; the above-mentioned second power supply module 8 can adopt a second power supply circuit composed of an output regulating device, a field effect transistor, and a motor interface, and can perform electric energy transmission control and electric energy superposition compensation control; the above-mentioned third power supply module 9 can adopt a third power supply circuit composed of a field effect transistor, a capacitor, and an auxiliary power supply interface, and can perform electric energy transmission control.

[0046] In another embodiment, please refer to Figure 1 、 Figure 2 、Figure 3 and Figure 4 , the first battery module 1 includes a first inductor L1, a first resistor R1, a third power transistor Q3, a second power transistor Q2, and a first battery pack; the micro-control module 3 includes a first controller U1; the equalization interaction module 4 includes a first transformer B1 and a second thyristor S2;

[0047] Specifically, the first end of the first battery pack is connected to the cathode of the second thyristor S2 and sequentially connected to the first end of the first primary side of the first transformer B1 through the first inductor L1 and the first resistor R1. The second end of the first primary side of the first transformer B1 is connected to the source of the third power transistor Q3. The drain of the third power transistor Q3 is connected to the drain of the second power transistor Q2. The source of the second power transistor Q2 is connected to the second end of the first battery pack. The gates of the third power transistor Q3, the second power transistor Q2, and the control terminal of the second thyristor S2 are respectively connected to the IO3 terminal, the IO2 terminal, and the IO12 terminal of the first controller U1. The anode of the second thyristor S2 is connected to the first end of the secondary side of the first transformer B1.

[0048] In a specific embodiment, the above-mentioned third power transistor Q3 and second power transistor Q2 can both be selected as N-channel field effect transistors with body diodes, which can control the energy storage and discharge operations of the first battery pack and can perform unidirectional power transmission control; the above-mentioned first battery pack can be selected as a storage battery; the above-mentioned second thyristor S2 can be selected as a one-way thyristor; the above-mentioned first controller U1 can be selected as an STM32 single-chip microcomputer.

[0049] Further, the second power supply module 8 includes a fourth inductor L4, a sixth power transistor Q6, a seventh power transistor Q7, a third resistor R3, and a second battery pack; the connection control module 6 includes a first thyristor S1, a first inverter INV1, a fourth diode D4, and a fifth diode D5;

[0050] Specifically, the first end of the second battery pack is connected to one end of the first thyristor S1 and sequentially connected to the first end of the second primary side of the first transformer B1 through the third resistor R3 and the fourth inductor L4. The source of the sixth power transistor Q6 is connected to the second end of the second primary side of the first transformer B1. The drain of the sixth power transistor Q6 is connected to the drain of the seventh power transistor Q7. The source of the seventh power transistor Q7 is connected to the second end of the second battery pack. The output terminal of the first inverter INV1 is connected to the control terminal of the first thyristor S1. The other end of the first thyristor S1 is connected to the second end of the first battery pack. The input terminal of the first inverter INV1 is connected to the cathodes of the fourth diode D4 and the fifth diode D5. The anode of the fourth diode D4, the gate of the sixth power transistor Q6, and the gate of the seventh power transistor Q7 are respectively connected to the IO1 terminal, the IO6 terminal, and the IO7 terminal of the first controller U1. The anode of the fifth diode D5 is connected to the second power supply module 8.

[0051] In a specific embodiment, the above-mentioned sixth power transistor Q6 and seventh power transistor Q7 can both be N-channel field effect transistors with body diodes, which control the discharge and energy storage of the second battery pack and perform unidirectional power transmission control; the type selection of the above-mentioned second battery pack is the same as that of the first battery pack; the above-mentioned first thyristor S1 can be a bidirectional thyristor; the above-mentioned first inverter INV1 can be a NOT gate chip.

[0052] Further, the third battery module 5 includes a second resistor R2, a third inductor L3, a fourth power transistor Q4, a fifth power transistor Q5, and a third battery pack; the micro control module 3 further includes a first detection device and a second detection device; the equalization interaction module 4 further includes a second inductor L2;

[0053] Specifically, the source of the fourth power transistor Q4 is connected to the first end of the secondary side of the first transformer B1 and is connected to the second end of the secondary side of the first transformer B1 and one end of the second resistor R2 through the second inductor L2, the other end of the second resistor R2 is connected to the second end of the third battery pack through the third inductor L3, the drain of the fourth power transistor Q4 is connected to the drain of the fifth power transistor Q5, the source of the fifth power transistor Q5 is connected to the first end of the third battery pack and the input end of the second detection device, the output end of the second detection device, the gate of the fourth power transistor Q4, and the gate of the fifth power transistor Q5 are respectively connected to the IO14 terminal, IO4 terminal, and IO5 terminal of the first controller U1, the first input terminal and the second input terminal of the first detection device are respectively connected to the first end of the first battery pack and the first end of the second battery pack, and the output end of the first detection device is connected to the IO13 terminal of the first controller U1.

[0054] In a specific embodiment, the above-mentioned fourth power transistor Q4 and fifth power transistor Q5 can both be N-channel field effect transistors with body diodes, which control the discharge and energy storage of the third battery module 5; the above-mentioned third battery pack can be a storage battery; the above-mentioned first detection device can be composed of a resistor, a comparator, and a subtraction device, which can perform voltage sampling on the first battery pack and the second battery pack, compare the voltage magnitudes of the first battery pack and the second battery pack, and calculate the voltage difference between the first battery pack and the second battery pack; the above-mentioned second detection device can be composed of a reference power supply, a resistor, and a comparator, which performs voltage sampling and sets a voltage threshold, and compares the sampled signal with the signal sampled by the first detection device and compares it with the set voltage threshold, and this voltage threshold is set by relevant staff.

[0055] Further, the first power supply module 7 includes a first power transistor Q1, a first capacitor C1, a first diode D1, a second diode D2, a third diode D3, a second capacitor C2, an eighth power transistor Q8, and a first motor interface;

[0056] Specifically, the drain of the first power transistor Q1 is connected to the first end of the first battery pack. The source of the first power transistor Q1 is connected to the anode of the second diode D2 and one end of the second capacitor C2, and is connected to the anode of the first diode D1 and the source of the eighth power transistor Q8 through the first capacitor C1. The cathode of the first diode D1 is connected to the cathode of the second diode D2 and the first end of the first motor interface. The other end of the second capacitor C2 is connected to the cathode of the third diode D3 and the second end of the first motor interface. The anode of the third diode D3 is connected to the second end of the first battery pack. The drain of the eighth power transistor Q8 is connected to the first end of the third battery pack. The gates of the eighth power transistor Q8 and the first power transistor Q1 are respectively connected to the IO8 terminal and the IO1 terminal of the first controller U1.

[0057] In a specific embodiment, the above-mentioned first power transistor Q1 can be an N-channel field effect transistor; the above-mentioned first motor interface is connected to the electric wheel of the electric wheel dump truck to supply power to the electric wheel of the electric wheel dump truck; the above-mentioned eighth power transistor Q8 can be an N-channel field effect transistor with a body diode.

[0058] Further, the second power supply module 8 includes a ninth power transistor Q9, an output regulating device, a second motor interface, and a tenth power transistor Q10;

[0059] Specifically, the drain of the ninth power transistor Q9 is connected to the first end of the third battery pack. The source of the ninth power transistor Q9 is connected to the second input terminal of the output regulating device. The first input terminal of the output regulating device is connected to the source of the tenth power transistor Q10. The drain of the tenth power transistor Q10 is connected to the first end of the second battery pack. The output terminal of the output regulating device is connected to the first end of the second motor interface. The second end of the second motor interface is connected to the ground terminal of the output regulating device, the second end of the second battery pack, and the second end of the third battery pack. The gates of the ninth power transistor Q9 and the tenth power transistor Q10 are respectively connected to the IO9 terminal and the IO10 terminal of the first controller U1.

[0060] In a specific embodiment, the above-mentioned ninth power transistor Q9 can be an N-channel field effect transistor, and the tenth power transistor Q10 can be an N-channel field effect transistor with a body diode; the circuit composition structure of the above-mentioned output regulating device is the same as that of the above-mentioned first capacitor C1, first diode D1, second diode D2, and second capacitor C2, for power transmission and power superposition compensation.

[0061] Further, the third power supply module 9 includes an eleventh power transistor Q11, a third capacitor C3, and an auxiliary power supply interface;

[0062] Specifically, the drain of the eleventh power transistor Q11 is connected to the first end of the third battery pack, the source of the eleventh power transistor Q11 is connected to the first end of the auxiliary power supply interface and is connected to the second end of the third battery pack and the second end of the auxiliary power supply interface through the third capacitor C3, and the gate of the eleventh power transistor Q11 is connected to the IO11 terminal of the first controller U1.

[0063] In a specific embodiment, the above-mentioned eleventh power transistor Q11 can be selected as an N-channel field effect transistor; the above-mentioned auxiliary power supply interface is connected to the auxiliary equipment of the electric wheel dump truck.

[0064] In the battery pack power balance control circuit of an electric wheel dump truck in this embodiment, during the operation of the dump truck, the IO1 terminal, IO10 terminal, and IO11 terminal of the first controller U1 respectively output a first working signal, a second working signal, and a third working signal, and respectively control the first power transistor Q1, the tenth power transistor Q10, and the eleventh power transistor Q11 to conduct, so that the third electric energy released by the first battery pack is transmitted to the electric wheel of the electric wheel dump truck connected to the first motor interface through the second diode D2. Similarly, the fourth electric energy released by the second battery pack is transmitted to the electric wheel of the electric wheel dump truck connected to the second motor interface, and the fifth electric energy released by the third battery pack is transmitted to the auxiliary equipment of the electric wheel dump truck connected to the auxiliary power supply interface. At the same time, the first detection device detects the voltages of the first battery pack and the second battery pack and respectively outputs a first voltage signal and a second voltage signal, and the second detection device detects the voltage of the third battery pack and outputs a third voltage signal. When the first voltage signal is lower than the second voltage signal, the IO8 of the first controller U1 outputs a first compensation signal to control the eighth power transistor Q8 to conduct, store the electric energy of the third battery pack through the first capacitor C1, perform superposition processing with the electric energy stored in the second capacitor C2, and transmit it to the first battery interface through the first diode D1. Similarly, when the first voltage signal is lower than the second voltage signal, the IO9 terminal of the first controller U1 outputs a second compensation signal and controls the ninth power transistor Q9 to conduct, and performs superposition compensation power supply for the second battery pack and the third battery pack through the output adjustment device, thereby maintaining equal-voltage power supply for the two electric wheels of the electric wheel dump truck. During the period when the dump truck stops working, the first inverter INV1 controls the first thyristor S1 to conduct, and the first battery pack and the second battery pack are connected in series. If the first voltage signal is equal to the second voltage signal and both are lower than the third voltage signal, the IO12 terminal of the first controller U1 outputs a total balance signal and controls the second thyristor S2 to conduct, and the IO4 terminal outputs a third discharge signal and controls the fourth power transistor Q4 to conduct. The third battery pack cooperates with the second inductor L2 to supply power to the first battery pack and the second battery pack in series. If the first voltage signal is greater than the second voltage signal and greater than the third voltage signal, the IO2 terminal of the first controller U1 outputs a first discharge signal and controls the second power transistor Q2 to conduct, and the IO5 terminal outputs a third energy storage signal and controls the fifth power transistor Q5 to conduct, so that the first battery pack supplies power to the third battery pack through the first transformer B1. Similarly, when the second voltage signal is greater than the first voltage signal and greater than the third voltage signal, the IO7 terminal outputs a second discharge signal and controls the seventh power transistor Q7 to conduct, and the IO5 terminal controls the fifth power transistor Q5 to conduct, and the second battery pack supplies power to the third battery pack. If the third voltage signal is greater than the first voltage signal and greater than the second voltage signal, the IO4 terminal controls the fourth power transistor Q4 to conduct, and the IO6 terminal outputs a second energy storage signal and controls the sixth power transistor Q6 to conduct, so that the third battery pack supplies power to the second battery pack. If the third voltage signal is greater than the second voltage signal and greater than the first voltage signal,The first controller U1 outputs a third discharge signal and a first energy storage signal, controls the fourth power transistor Q4 and the third power transistor Q3 to conduct respectively. The third battery pack supplies power to the first battery pack. If the third voltage signal is lower than the voltage threshold set by the second detection device, the discharge operation of the third battery pack will be stopped and a total balancing signal will be output. At this time, according to the voltage magnitude between the first voltage signal and the second voltage signal, a first discharge signal or a second discharge signal will be output to control the voltage balancing of the first battery module 1 and the second battery module 2. That is, when the first voltage signal is greater than the second voltage signal, the first battery pack will be controlled to discharge, which is isolated and transformed by the first transformer B1 and stored by the second inductor L2. The electric energy stored in the second inductor L2 directly supplies power to the series-connected first battery pack and second battery pack through the second thyristor S2. Similarly, when the first voltage signal is less than the second voltage signal, the second battery pack discharges, and the electric energy stored in the second inductor L2 directly supplies power to the series-connected first battery pack and second battery pack through the second thyristor S2.

[0065] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0066] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A battery pack power balance control circuit for an electric wheel dump truck, characterized in that: The circuit includes: a first battery module, connected to the microcontrol module and the balancing interaction module, and used to store the second electric energy output by the balancing interaction module, store the first electric energy output by the balancing interaction module when receiving the first energy storage signal output by the microcontrol module, release the stored electric energy and provide the third electric energy, and adjust the third electric energy and output the first balancing electric energy when receiving the first discharge signal output by the microcontrol module; a second battery module, connected to the micro-control module, the connection control module and the balancing interaction module, and used to store the sixth electric energy output by the connection control module, store the first electric energy output by the balancing interaction module when receiving the second energy storage signal output by the micro-control module, release the stored electric energy and provide the fourth electric energy, and adjust the fourth electric energy and output the second balancing electric energy when receiving the second discharge signal output by the micro-control module; The microcontrol module is connected to the third battery module and is used to perform voltage sampling on the first battery module, the second battery module and the third battery module and output the first voltage signal, the second voltage signal and the third voltage signal respectively. During the operation of the dump truck, the first working signal, the second working signal and the third working signal are output. When the first voltage signal is lower than the second voltage signal, the first compensation signal is output. When the first voltage signal is higher than the second voltage signal, the second compensation signal is output. During the period when the dump truck stops working, when the first voltage signal is equal to the second voltage signal and both are lower than the third voltage signal, the total balance signal and the third discharge signal are output. When the first voltage signal is greater than the second voltage signal and greater than the third voltage signal , output the first discharge signal and the third energy storage signal, when the second voltage signal is greater than the first voltage signal and greater than the third voltage signal, output the second discharge signal and the third energy storage signal, when the third voltage signal is greater than the first voltage signal and greater than the second voltage signal, output the third discharge signal and the second energy storage signal, when the third voltage signal is greater than the second voltage signal and greater than the first voltage signal, output the third discharge signal and the first energy storage signal, when the third voltage signal is greater than the second voltage signal and greater than the first voltage signal, output the third discharge signal and the first energy storage signal, when the third voltage signal is lower than the set voltage threshold, stop the discharge work and output the total balancing signal, according to the voltage between the first voltage signal and the second voltage signal, output the first discharge signal or the second discharge signal and control the voltage balancing of the first battery module and the second battery module; a balancing interaction module connected to the microcontroller module and the third battery module, configured to isolate and transform the first balancing electric energy or the second balancing electric energy, output the third balancing electric energy, and store the third balancing electric energy, isolate and transform the fifth electric energy output by the third battery module, and output the first electric energy, and when receiving the total balancing signal, control the transmission of the third balancing electric energy or the fifth electric energy output by the third battery module and provide the second electric energy; a third battery module, configured to rectify and store the third equalized electric energy upon receiving a third charging signal, and release the stored electric energy and provide the fifth electric energy upon receiving a third discharging signal; The connection control module is connected to the microcontrol module and the first battery module, and is used to control the first battery module and the second battery module to be connected in series and output the sixth electric energy when the first working signal or the second working signal is not received.

2. The battery pack power balance control circuit of an electric wheel dump truck according to claim 1, characterized in that: The battery pack power balance control circuit of the electric wheel dump truck also includes a first power supply module, a second power supply module and a third power supply module; a first power supply module connected to the microcontroller module, the first battery module and the third battery module, and configured to transmit the third electric energy to the electric wheel of the connected electric wheel dump truck upon receiving the first working signal, and to superimpose the fifth electric energy with the third electric energy and supply power to the electric wheel upon receiving the first compensation signal; a second power supply module connected to the microcontroller module, the second battery module and the third battery module, and configured to transmit the fourth electric energy to the electric wheel of the connected electric wheel dump truck upon receiving the second working signal, and to superimpose the fifth electric energy with the fourth electric energy and supply power to the electric wheel upon receiving the second compensation signal; The third power supply module is connected to the third battery module and the micro-control module, and is used to transmit the fifth electric energy to the auxiliary equipment of the connected electric wheel dump truck when receiving the third working signal.

3. The battery pack power balance control circuit of an electric wheel dump truck according to claim 2, characterized in that: The first battery module includes a first inductor, a first resistor, a third power tube, a second power tube and a first battery pack; the microcontroller module includes a first controller; the balancing interaction module includes a first transformer and a second thyristor; The first end of the first battery group is connected to the cathode of the second thyristor and is connected to the first end of the first primary side of the first transformer through the first inductor and the first resistor in sequence. The second end of the first primary side of the first transformer is connected to the source of the third power tube, the drain of the third power tube is connected to the drain of the second power tube, the source of the second power tube is connected to the second end of the first battery group, the gate of the third power tube, the gate of the second power tube and the control end of the second thyristor are respectively connected to the IO3 end, IO2 end and IO12 end of the first controller, and the anode of the second thyristor is connected to the first end of the secondary side of the first transformer.

4. The battery pack power balance control circuit of an electric wheel dump truck according to claim 3 is characterized in that: The second power supply module includes a fourth inductor, a sixth power tube, a seventh power tube, a third resistor and a second battery pack; the connection control module includes a first thyristor, a first inverter, a fourth diode and a fifth diode; The first end of the second battery group is connected to one end of the first thyristor and is connected to the first end of the second primary side of the first transformer through the third resistor and the fourth inductor in sequence. The source of the sixth power tube is connected to the second end of the second primary side of the first transformer, the drain of the sixth power tube is connected to the drain of the seventh power tube, the source of the seventh power tube is connected to the second end of the second battery group, the output end of the first inverter is connected to the control end of the first thyristor, the other end of the first thyristor is connected to the second end of the first battery group, the input end of the first inverter is connected to the cathode of the fourth diode and the cathode of the fifth diode, the anode of the fourth diode, the gate of the sixth power tube and the gate of the seventh power tube are respectively connected to the IO1 end, IO6 end and IO7 end of the first controller, and the anode of the fifth diode is connected to the second power supply module.

5. The battery pack power balance control circuit of an electric wheel dump truck according to claim 4, characterized in that: The third battery module includes a second resistor, a third inductor, a fourth power tube, a fifth power tube and a third battery pack; the microcontroller module also includes a first detection device and a second detection device; the balancing interaction module also includes a second inductor; The source of the fourth power tube is connected to the first end of the secondary side of the first transformer and is connected to the second end of the secondary side of the first transformer and one end of the second resistor through the second inductor. The other end of the second resistor is connected to the second end of the third battery pack through the third inductor. The drain of the fourth power tube is connected to the drain of the fifth power tube. The source of the fifth power tube is connected to the first end of the third battery pack and the input end of the second detection device. The output end of the second detection device, the gate of the fourth power tube and the gate of the fifth power tube are respectively connected to the IO14 end, IO4 end and IO5 end of the first controller. The first input end and the second input end of the first detection device are respectively connected to the first end of the first battery pack and the first end of the second battery pack. The output end of the first detection device is connected to the IO13 end of the first controller.

6. The battery pack power balance control circuit of an electric wheel dump truck according to claim 5, characterized in that: The first power supply module includes a first power tube, a first capacitor, a first diode, a second diode, a third diode, a second capacitor, an eighth power tube and a first motor interface; The drain of the first power tube is connected to the first end of the first battery group, the source of the first power tube is connected to the anode of the second diode and one end of the second capacitor and is connected to the anode of the first diode and the source of the eighth power tube through the first capacitor, the cathode of the first diode is connected to the cathode of the second diode and the first end of the first motor interface, the other end of the second capacitor is connected to the cathode of the third diode and the second end of the first motor interface, the anode of the third diode is connected to the second end of the first battery group, the drain of the eighth power tube is connected to the first end of the third battery group, and the gate of the eighth power tube and the gate of the first power tube are respectively connected to the IO8 end and IO1 end of the first controller.

7. The battery pack power balance control circuit of an electric wheel dump truck according to claim 6, characterized in that: The second power supply module includes a ninth power tube, an output regulating device, a second motor interface and a tenth power tube; The drain of the ninth power tube is connected to the first end of the third battery group, the source of the ninth power tube is connected to the second input end of the output regulating device, the first input end of the output regulating device is connected to the source of the tenth power tube, the drain of the tenth power tube is connected to the first end of the second battery group, the output end of the output regulating device is connected to the first end of the second motor interface, the second end of the second motor interface is connected to the ground end of the output regulating device, the second end of the second battery group and the second end of the third battery group, and the gate of the ninth power tube and the gate of the tenth power tube are respectively connected to the IO9 end and IO10 end of the first controller.

8. The battery pack power balance control circuit of an electric wheel dump truck according to claim 7, characterized in that: The third power supply module includes an eleventh power tube, a third capacitor and an auxiliary machine power supply interface; The drain of the eleventh power tube is connected to the first end of the third battery pack, the source of the eleventh power tube is connected to the first end of the auxiliary power interface and is connected to the second end of the third battery pack and the second end of the auxiliary power interface through the third capacitor, and the gate of the eleventh power tube is connected to the IO11 end of the first controller.

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