Power supply system applied to new energy commercial vehicle and new energy commercial vehicle

Abstract

The specification discloses a power supply system applied to a new energy commercial vehicle and the new energy commercial vehicle, and relates to the technical field of batteries. The power supply system comprises a first battery pack, a second battery pack and a controller. A plurality of cells in series are arranged in the first battery pack. The second battery pack is provided with a first cell group, a second cell group and a third cell group which are electrically connected to each other, and the first cell group, the second cell group and the third cell group are electrically connected to a motor. The number of cells in the first cell group, the second cell group and the third cell group is the same, and adjacent cells are connected through a bridge provided with a MOS tube. The controller is in communication connection with the first cell group, the second cell group and the third cell group, respectively, and is used for controlling the on-off of the MOS tube in the plurality of bridges, adjusting the series or parallel connection relationship between the cells, so that the phase difference between any two cell groups is 120 degrees. It can be seen that the three cell groups can directly output three-phase alternating current, reduce the loss of electric energy, and improve the energy utilization rate.

Description

Technical Field

[0001] This specification relates to the field of battery technology, and in particular to a power supply system for new energy commercial vehicles and the new energy commercial vehicles themselves. Background Technology

[0002] Normally, the cells in a battery pack are connected in series to directly output direct current, while the motor requires alternating current for power.

[0003] In existing technologies, battery packs are typically connected to AC / DC conversion devices such as inverters to convert DC power into AC power, thereby powering the motor.

[0004] However, this method has low energy utilization and results in energy waste. Summary of the Invention

[0005] This specification provides a power supply system for new energy commercial vehicles and a new energy commercial vehicle, so as to at least partially solve the above-mentioned problems existing in the prior art.

[0006] The following technical solution is adopted in this specification: This specification provides a power supply system for new energy commercial vehicles, including a first battery pack, a second battery pack, and a controller; The first battery pack contains multiple battery cells connected in series. The second battery pack contains a first battery cell group, a second battery cell group, and a third battery cell group that are electrically connected to each other. The first battery cell group, the second battery cell group, and the third battery cell group are each electrically connected to the motor. The first battery cell group, the second battery cell group, and the third battery cell group have the same number of cells, and adjacent cells are connected by a bridge circuit equipped with MOSFETs. The controller is communicatively connected to the first cell group, the second cell group, and the third cell group, respectively, and is used to control the on / off state of the MOS transistors in multiple bridge circuits and adjust the series or parallel connection relationship between the cells so that the phase difference between any two cell groups is 120 degrees.

[0007] Preferably, the first battery cell group, the second battery cell group, and the third battery cell group are all provided with a connecting electrode and an output electrode; The connecting terminals of the first battery cell group, the second battery cell group, and the third battery cell group are interconnected to form a circuit; The output terminals of the first, second, and third battery cell groups are all equipped with capacitors and inductors; the capacitors are used to smooth the voltage and adjust the output phase angle; the inductors are used to smooth the current.

[0008] Preferably, the initial state of the MOS transistors of the bridge configured in the first cell group, the second cell group and the third cell group is preset, such that in the initial state, the phase difference between any two cell groups is 120 degrees. The capacitors and / or inductors configured in the first battery cell group, the second battery cell group, and the third battery cell group are mutually compatible.

[0009] Preferably, the first battery cell group, the second battery cell group, and the third battery cell group are all equipped with sensor groups; The sensor group is used to collect cell group data in real time and send the cell group data to the controller; the cell group data includes voltage data and / or current data and / or phase data.

[0010] Preferably, any two cells in the first cell group, the second cell group, and the third cell group are connected through a conversion circuit; The conversion circuit includes at least a first MOSFET and a second MOSFET. When the first MOSFET is turned off, the two cells connected to the conversion circuit are connected in series. When the second MOSFET is turned off, the two cells connected to the conversion circuit are connected in parallel.

[0011] Preferably, the first battery cell group, the second battery cell group, and the third battery cell group are all provided with output terminals; the output terminals are provided with flip-flop circuits. The switching circuit includes a third MOSFET and a fourth MOSFET; The source of the third MOS transistor is connected to the positive terminal of the output, and the drain of the third MOS transistor is connected to the end of the output. The source of the fourth MOS transistor is connected to the negative terminal of the output, and the drain of the fourth MOS transistor is connected to the end of the output.

[0012] Preferably, the power supply system applied to new energy commercial vehicles further includes a driver chip; The driver chip is communicatively connected to the controller, and the driver chip is electrically connected to the gates of the plurality of MOS transistors; The driver chip is used to output different drive voltages to the gates of the plurality of MOS transistors based on the stored program or in response to the instructions sent by the controller, thereby controlling the on / off state of the plurality of MOS transistors.

[0013] Preferably, the power supply system applied to the new energy commercial vehicle includes a third battery pack, DC electrical appliances, and AC auxiliary drive; the motor includes a first motor and a second motor. The structure of the third battery pack is the same as that of the second battery pack; The second battery pack is used to power the first motor; The third battery pack is used to power the second motor; The DC electrical appliance is electrically connected to the first battery pack; The AC auxiliary drive is connected to the first battery cell group, the second battery cell group, and the third battery cell group, respectively.

[0014] On the other hand, this specification provides a new energy commercial vehicle, which includes the power supply system for the new energy commercial vehicle provided in the above-mentioned aspect.

[0015] The above-mentioned technical solutions adopted in this specification can achieve the following beneficial effects: According to the above, the power supply system for new energy commercial vehicles includes a first battery pack, a second battery pack, and a controller. The first battery pack contains multiple battery cells connected in series. The second battery pack contains a first cell group, a second cell group, and a third cell group that are electrically connected to each other, and each of these groups is electrically connected to a motor. Furthermore, each of the first, second, and third cell groups has the same number of cells, and adjacent cells are connected via a bridge circuit with MOSFETs. The controller is communicatively connected to each of the first, second, and third cell groups, and is used to control the switching of the MOSFETs in the multiple bridge circuits, adjusting the series or parallel connection relationship between the cells to ensure that the phase difference between any two cell groups is 120 degrees.

[0016] As can be seen, by directly controlling the MOSFETs connected to the cells in the three cell groups through the controller, the three cell groups can output sinusoidal currents with a phase difference of 120 degrees, directly outputting three-phase AC power, reducing power loss and improving energy utilization. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this specification and form part of this specification, illustrate exemplary embodiments and are used to explain this specification, but do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a power supply system architecture in the prior art; Figure 2 A schematic diagram of the architecture of a power supply system for new energy commercial vehicles provided as an embodiment of this specification; Figure 3 A partial structural schematic diagram of a power supply system for new energy commercial vehicles provided as an embodiment of this specification; Figure 4A timing diagram of the initial state of the second battery pack output provided for one embodiment of this specification; Figure 5 A control timing diagram of a first battery cell group, a second battery cell group, and a third battery cell group provided for one embodiment of this specification; Figure 6 A schematic diagram of a conversion circuit provided for one embodiment of this specification; Figure 7 A schematic diagram of a flip circuit provided for one embodiment of this specification; Figure 8 A schematic diagram of the cell connection provided for one embodiment of this specification; Figure 9 A schematic diagram of the cell connection provided for one embodiment of this specification; Figure 10 A schematic diagram of the cell connection provided for one embodiment of this specification; Figure 11 This is a schematic diagram of the architecture of a power supply system for new energy commercial vehicles, provided as an embodiment of this specification.

[0018] Explanation of reference numerals in the attached figures: First battery pack 1; Second battery pack 2; DC electrical appliance 3; AC auxiliary drive 4; Motor 5; Connection interface 6; First MOSFET 71; Second MOSFET 72; Third MOSFET 73; Fourth MOSFET 74; Third battery pack 8. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this specification clearer, the technical solutions of this specification will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this specification, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in this specification without creative effort are within the scope of protection of this application.

[0020] In the description of this invention, it should be noted that the term "or" is generally used to include the meaning of "and / or" unless otherwise expressly stated in the content.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0022] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] As shown in the background section, in the prior art, a power supply system generally includes multiple battery packs, a battery disconnect unit (BDU), a microcontroller unit (MCU), and a motor. The battery packs output direct current (DC), the battery disconnect unit collects and distributes the received DC power, and the MCU converts the distributed DC power into alternating current (AC) and distributes it to the motor.

[0024] Figure 1 A schematic diagram of the power supply system architecture in the prior art, such as Figure 1 As shown, under ideal conditions, the energy efficiency of the battery pack itself is 95%, the energy efficiency of the battery pack to transmit electrical energy to the BDU is 99%, the energy efficiency of the BDU to combine and distribute energy is 95%, the energy efficiency of the BDU to the MCU is 99%, the energy efficiency of the MCU to perform AC-DC conversion is 97%, and the energy efficiency of the MCU output to motor 5 is 99%. In this process, the overall energy efficiency is 84.94, and the energy loss exceeds 15%.

[0025] The technical solutions provided in the various embodiments of this specification are described in detail below with reference to the accompanying drawings.

[0026] Figure 2 This specification provides an architectural diagram of a power supply system for new energy commercial vehicles, as an embodiment of which is illustrated. Figure 2 As shown, the power supply system applied to new energy commercial vehicles includes a first battery pack 1, a second battery pack 2, a DC electrical appliance 3, an AC auxiliary drive 4, a controller, and a motor 5.

[0027] Preferably, the first battery pack 1 contains a plurality of battery cells connected in series.

[0028] Preferably, the first battery pack 1 is used to supply direct current.

[0029] Preferably, the DC appliance 3 is electrically connected to the first battery pack 1.

[0030] Preferably, the DC electrical appliance 3 is connected to DC electrical equipment such as electric power steering, water pump, compressor, central locking, and seat heating.

[0031] Preferably, the second battery pack 2 is provided with a first battery cell group, a second battery cell group and a third battery cell group that are electrically connected to each other.

[0032] Preferably, the first battery cell group, the second battery cell group, and the third battery cell group are electrically connected to the motor 5.

[0033] Preferably, the second battery pack 2 is provided with at least three connection interfaces 6, and the three connection interfaces 6 correspond to the first battery cell group, the second battery cell group and the third battery cell group respectively.

[0034] Preferably, the second battery pack 2 is connected to the motor 5 through the three connection interfaces 6.

[0035] Preferably, the first battery cell group, the second battery cell group, and the third battery cell group have the same number of battery cells.

[0036] Preferably, in the first, second, and third battery cell groups, adjacent cells are connected by a bridge circuit equipped with a metal-oxide-semiconductor field-effect (MOS) transistor.

[0037] Preferably, the AC auxiliary drive 4 is connected to the first battery cell group, the second battery cell group, and the third battery cell group respectively.

[0038] Preferably, the motor 5 is connected to the three connection interfaces 6 via three connecting wires, and the AC auxiliary drive 4 is connected to the three connecting wires.

[0039] Figure 3 A partial structural diagram of a power supply system for new energy commercial vehicles, provided as an embodiment of this specification, is shown below. Figure 3 As shown, the motor 5 is connected to the three connection interfaces 6 via three connecting wires, and the AC auxiliary drive 4 is connected to the three connecting wires.

[0040] Preferably, the AC auxiliary drive 4 is used to supply power to equipment that requires AC power, such as air conditioning compressors and oil pumps.

[0041] Preferably, the controller is communicatively connected to the first battery cell group, the second battery cell group, and the third battery cell group, respectively.

[0042] Preferably, the controller is used to control the switching on and off of MOSFETs in multiple bridge circuits and to adjust the series or parallel connection relationship between battery cells.

[0043] Preferably, the controller is used to control the output phase difference of the first battery cell group, the second battery cell group, and the third battery cell group, so that the phase difference between any two battery cell groups is 120 degrees.

[0044] Preferably, the controller is communicatively connected to the first battery cell group, the second battery cell group, and the third battery cell group, respectively, and is used to control the on / off state of the MOSFETs in the multiple bridge circuits and adjust the series or parallel connection relationship between the battery cells so that the phase difference between any two battery cell groups is 120 degrees.

[0045] According to the above, the power supply system for new energy commercial vehicles includes a first battery pack 1, a second battery pack 2, a DC appliance 3, an AC auxiliary drive 4, a controller, and a motor 5. The first battery pack 1 contains multiple battery cells connected in series. The DC appliance 3 is electrically connected to the first battery pack 1. The second battery pack 2 contains a first cell group, a second cell group, and a third cell group that are electrically connected to each other, and each of these groups is electrically connected to the motor 5. Each of the first, second, and third cell groups has the same number of cells, and adjacent cells are connected via a bridge circuit equipped with MOSFETs. The AC auxiliary drive 4 is connected to each of the first, second, and third cell groups. The controller is communicatively connected to the first, second, and third battery cell groups, and is used to control the on / off state of the MOSFETs in the multiple bridge circuits, adjust the series or parallel connection relationship between the battery cells, and control the output phase difference of the first, second, and third battery cell groups so that the phase difference between any two battery cell groups is 120 degrees.

[0046] As can be seen, by directly controlling the MOSFETs connected to the cells in the three cell groups through the controller, the three cell groups can output sinusoidal currents with a phase difference of 120 degrees, directly outputting three-phase AC power, reducing power loss and improving energy utilization.

[0047] Preferably, the first battery cell group, the second battery cell group, and the third battery cell group are all provided with a connecting electrode and an output electrode.

[0048] Preferably, the connecting poles of the first battery cell group, the second battery cell group, and the third battery cell group are interconnected to form a circuit.

[0049] Preferably, the output terminals of the first battery cell group, the second battery cell group, and the third battery cell group are all provided with capacitors and inductors.

[0050] Preferably, the capacitor is used to smooth the voltage and adjust the output phase angle.

[0051] Preferably, the inductor is used to smooth the current.

[0052] Preferably, the initial state of the MOSFETs in the bridges configured in the first, second, and third battery cell groups is preset, such that in the initial state, the phase difference between any two battery cell groups is 120 degrees, and the capacitors and / or inductors configured in the first, second, and third battery cell groups are mutually compatible, and the on / off commands preset by the controller output or driver chip for the MOSFETs in the first, second, and third battery cell groups are mutually compatible, so that the phase difference between any two battery cell groups can be maintained at 120 degrees.

[0053] Figure 4 A timing diagram of the initial state of the output of the second battery pack 2 provided for one embodiment of this specification, as shown below. Figure 4 As shown, all three output voltages exhibit sinusoidal waves with a phase difference of 120 degrees.

[0054] Figure 5 A control timing diagram of a first battery cell group, a second battery cell group, and a third battery cell group, provided for one embodiment of this specification, is shown below. Figure 5 As shown, 1 indicates series connection, 0 indicates parallel connection or disconnection, and the rightmost side is the output. During the timing control process, by adjusting the series, parallel or disconnection states of different bridges, the output voltage of the entire battery pack is gradually increased from 0 to the maximum voltage, and the cycle repeats.

[0055] Preferably, the first battery cell group, the second battery cell group, and the third battery cell group are all equipped with sensor groups.

[0056] Preferably, the sensor group is used to acquire cell group data in real time and send the cell group data to the controller. The cell group data includes voltage data and / or current data and / or phase data, etc., which are not limited herein.

[0057] Accordingly, the sensor group includes voltage sensors, current sensors, etc., which are not limited in this specification.

[0058] Preferably, the controller is used to send instructions based on the data of the battery cell group to control the on / off state of the MOSFETs in the first battery cell group and / or the second battery cell group and / or the third battery cell group, and to finely adjust the phase difference between any two battery cell groups in real time to ensure that the phase difference between any two battery cell groups is 120 degrees.

[0059] Preferably, any two cells in the first, second, and third battery cell groups are connected by a conversion circuit.

[0060] Preferably, the conversion circuit includes at least a first MOSFET 71 and a second MOSFET 72.

[0061] Preferably, when the first MOS transistor 71 is turned off, the two cells connected to the conversion circuit are in series.

[0062] Preferably, when the second MOS transistor 72 is turned off, the two cells connected to the conversion circuit are in parallel.

[0063] Figure 6 A schematic diagram of a conversion circuit provided for one embodiment of this specification, such as... Figure 6 As shown, the conversion circuit has two first MOSFETs 71 and two second MOSFETs 72.

[0064] Preferably, the first battery cell group, the second battery cell group, and the third battery cell group are all provided with an output terminal; the output terminal is provided with a switching circuit.

[0065] Preferably, the switching circuit includes a third MOSFET 73 and a fourth MOSFET 74.

[0066] Preferably, the source of the third MOS transistor 73 is connected to the positive terminal of the output terminal, and the drain of the third MOS transistor 73 is connected to the end of the output terminal.

[0067] Preferably, the source of the fourth MOS transistor 74 is connected to the negative terminal of the output, and the drain of the fourth MOS transistor 74 is connected to the end of the output.

[0068] Preferably, the flip circuit is used to adjust the polarity of the voltage output by the first battery cell group, the second battery cell group, and the third battery cell group.

[0069] Figure 7 A schematic diagram of a flip circuit provided for one embodiment of this specification is shown below. Figure 7 As shown, the third MOSFET 73 and the fourth MOSFET 74 are connected to the positive and negative terminals of the output, respectively.

[0070] Figures 8-10 These are schematic diagrams of cell connections provided in one embodiment of this specification, such as... Figure 8-10 As shown, the cells are connected by a bridge circuit. By controlling the switching on and off of the MOSFET, the cells can be connected in series or in parallel.

[0071] Preferably, the power supply system for new energy commercial vehicles also includes a driver chip.

[0072] Preferably, the driver chip is communicatively connected to the controller, and the driver chip is electrically connected to the gates of the plurality of MOS transistors.

[0073] Preferably, the driver chip is used to output different drive voltages to the gates of the plurality of MOSFETs based on the stored program or in response to the instructions sent by the controller, thereby controlling the on / off state of the plurality of MOSFETs.

[0074] Preferably, the power supply system for new energy commercial vehicles includes a third battery pack 8; the motor 5 includes a first motor 5 and a second motor 5.

[0075] Preferably, the structure of the third battery pack 8 is the same as that of the second battery pack 2.

[0076] Preferably, the second battery pack 2 is used to power the first motor 5.

[0077] Preferably, the third battery pack 8 is used to power the second motor 5.

[0078] Preferably, the number of cells in the first battery pack 1 is less than the number of cells in the second battery pack 2.

[0079] Preferably, the maximum output voltage of the first battery cell group, the second battery cell group, and the third battery cell group is 268.8V.

[0080] Preferably, the number of battery cells in the first battery cell group, the second battery cell group, and the third battery cell group is greater than 50.

[0081] Figure 11 This specification provides an architectural diagram of a power supply system for new energy commercial vehicles, as an embodiment of which is illustrated. Figure 11 As shown, the third battery pack 8 is used to power the motor 5.

[0082] Preferably, the controller can be the ZH5212 controller released by Junmin Technology, or the BMS series of battery controllers from the Chinese Academy of Sciences, or the TI BQ78350-R1 battery management chip, Renesas ISL94202 BMS controller, Analog Devices LTC6811, STMicroelectronics L9961, etc., etc., and this specification does not impose any restrictions. It should be emphasized that the control logic provided in this specification can be implemented based on the aforementioned controllers.

[0083] Preferably, the driver chip can be IR2110 (Infineon), DRV8701 (Texas Instruments), TC4420 (Microchip), etc., but this specification does not limit it.

[0084] The above are one or more embodiments of the power supply system for new energy commercial vehicles provided in this specification. Based on the same idea, this specification also provides a new energy commercial vehicle.

[0085] Preferably, the new energy vehicle includes the power supply system for new energy commercial vehicles provided in any of the above embodiments.

[0086] It should be noted that all actions involving the acquisition of signals, information, or data in this application are carried out in compliance with the relevant data protection laws and policies of the country where the application is located, and with the authorization granted by the owner of the relevant device.

[0087] In the 1990s, improvements to a technology could be clearly distinguished as either hardware improvements (e.g., improvements to the circuit structure of diodes, transistors, switches, etc.) or software improvements (improvements to the methodology). However, with technological advancements, many methodological improvements today can be considered direct improvements to the hardware circuit structure. Designers almost always obtain the corresponding hardware circuit structure by programming the improved methodology into the hardware circuit. Therefore, it cannot be said that a methodological improvement cannot be implemented using hardware physical modules. For example, a Programmable Logic Device (PLD) (such as a Field Programmable Gate Array (FPGA)) is such an integrated circuit whose logic function is determined by the user programming the device. Designers can program and "integrate" a digital system onto a PLD themselves, without needing chip manufacturers to design and manufacture dedicated integrated circuit chips. Furthermore, nowadays, instead of manually manufacturing integrated circuit chips, this programming is mostly implemented using "logic compiler" software. Similar to the software compiler used in program development, the original code before compilation must also be written in a specific programming language, called a Hardware Description Language (HDL). There are many HDLs, such as ABEL (Advanced Boolean Expression Language), AHDL (Altera Hardware Description Language), Confluence, CUPL (Cornell University Programming Language), HDCal, JHDL (Java Hardware Description Language), Lava, Lola, MyHDL, PALASM, and RHDL (Ruby Hardware Description Language). Currently, the most commonly used are VHDL (Very-High-Speed ​​Integrated Circuit Hardware Description Language) and Verilog. Those skilled in the art should also understand that by simply performing some logic programming on the method flow using one of these hardware description languages ​​and programming it into an integrated circuit, the hardware circuit implementing the logical method flow can be easily obtained.

[0088] The controller can be implemented in any suitable manner. For example, it can take the form of a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro)processor, logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers, and embedded microcontrollers. Examples of controllers include, but are not limited to, the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicon Labs C8051F320. A memory controller can also be implemented as part of the control logic of the memory. Those skilled in the art will also recognize that, in addition to implementing the controller in purely computer-readable program code form, the same functionality can be achieved by logically programming the method steps to make the controller take the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, such a controller can be considered a hardware component, and the means included therein for implementing various functions can also be considered as structures within the hardware component. Alternatively, the means for implementing various functions can be considered as both software modules implementing the method and structures within the hardware component.

[0089] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, a computer can be, for example, a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email device, game console, tablet computer, wearable device, or any combination of these devices.

[0090] For ease of description, the above devices are described in terms of function, divided into various units. Of course, in implementing this specification, the functions of each unit can be implemented in one or more software and / or hardware components.

[0091] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0092] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0093] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0094] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0095] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0096] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0097] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0098] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0099] Those skilled in the art will understand that the embodiments of this specification can be provided as methods, systems, or computer program products. Therefore, this specification may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this specification may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0100] This specification can be described in the general context of computer-executable instructions that are executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a specific task or implement a specific abstract data type. This specification can also be practiced in distributed computing environments, where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0101] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0102] The above description is merely an embodiment of this specification and is not intended to limit this specification. Various modifications and variations can be made to this specification by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of the claims of this application.

Claims

1. A power supply system for use in new energy commercial vehicles, characterized in that, Includes a first battery pack, a second battery pack, and a controller; The first battery pack contains multiple battery cells connected in series. The second battery pack contains a first battery cell group, a second battery cell group, and a third battery cell group that are electrically connected to each other, and the first battery cell group, the second battery cell group, and the third battery cell group are respectively electrically connected to the motor; the first battery cell group, the second battery cell group, and the third battery cell group have the same number of cells, and adjacent cells are connected by a bridge equipped with MOSFETs; The controller is communicatively connected to the first cell group, the second cell group, and the third cell group, respectively, and is used to control the on / off state of the MOS transistors in multiple bridge circuits and adjust the series or parallel connection relationship between the cells so that the phase difference between any two cell groups is 120 degrees.

2. The power supply system for new energy commercial vehicles according to claim 1, characterized in that, The first battery cell group, the second battery cell group, and the third battery cell group are all provided with a connecting electrode and an output electrode; The connecting terminals of the first battery cell group, the second battery cell group, and the third battery cell group are interconnected to form a circuit; The output terminals of the first, second, and third battery cell groups are all equipped with capacitors and inductors; the capacitors are used to smooth the voltage and adjust the output phase angle; the inductors are used to smooth the current.

3. The power supply system for new energy commercial vehicles according to claim 2, characterized in that, The initial state of the MOS transistors of the bridge configured in the first cell group, the second cell group and the third cell group is preset so that the phase difference between any two cell groups is 120 degrees in the initial state. The capacitors and / or inductors configured in the first battery cell group, the second battery cell group, and the third battery cell group are mutually compatible.

4. The power supply system for new energy commercial vehicles according to claim 3, characterized in that, The first battery cell group, the second battery cell group, and the third battery cell group are all equipped with sensor groups; The sensor group is used to collect cell group data in real time and send the cell group data to the controller; the cell group data includes voltage data and / or current data and / or phase data.

5. The power supply system for new energy commercial vehicles according to claim 1, characterized in that, In the first battery cell group, the second battery cell group, and the third battery cell group, any two battery cells are connected through a conversion circuit; The conversion circuit includes at least a first MOSFET and a second MOSFET. When the first MOSFET is turned off, the two cells connected to the conversion circuit are connected in series. When the second MOSFET is turned off, the two cells connected to the conversion circuit are connected in parallel.

6. The power supply system for new energy commercial vehicles according to claim 5, characterized in that, The first battery cell group, the second battery cell group, and the third battery cell group are all provided with an output terminal; the output terminal is provided with a flip-flop circuit. The switching circuit includes a third MOSFET and a fourth MOSFET; The source of the third MOS transistor is connected to the positive terminal of the output, and the drain of the third MOS transistor is connected to the end of the output. The source of the fourth MOS transistor is connected to the negative terminal of the output, and the drain of the fourth MOS transistor is connected to the end of the output.

7. The power supply system for new energy commercial vehicles according to any one of claims 1-6, characterized in that, The power supply system applied to new energy commercial vehicles also includes a driver chip; The driver chip is communicatively connected to the controller, and the driver chip is electrically connected to the gates of the plurality of MOS transistors; The driver chip is used to output different drive voltages to the gates of the plurality of MOS transistors based on the stored program or in response to the instructions sent by the controller, thereby controlling the on / off state of the plurality of MOS transistors.

8. The power supply system for new energy commercial vehicles according to any one of claims 1-6, characterized in that, The power supply system applied to new energy commercial vehicles includes a third battery pack, DC electrical appliances, and AC auxiliary drive; the motor includes a first motor and a second motor. The structure of the third battery pack is the same as that of the second battery pack; The second battery pack is used to power the first motor; The third battery pack is used to power the second motor; The DC electrical appliance is electrically connected to the first battery pack; The AC auxiliary drive is connected to the first battery cell group, the second battery cell group, and the third battery cell group, respectively.

9. The power supply system for new energy commercial vehicles according to any one of claims 1-6, characterized in that, The number of cells in the first battery pack is less than the number of cells in the second battery pack.

10. A new energy commercial vehicle, characterized in that, The new energy commercial vehicle includes the power supply system applied to the new energy commercial vehicle as described in any one of claims 1-9.

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