Power supply system and vehicle

Abstract

The invention discloses a power supply system and a vehicle. The power supply system comprises a power battery and an inverter. The power battery is used for providing high-voltage direct current; the inverter is electrically connected with the power battery and used for converting the high-voltage direct-current electric energy into alternating current. According to the technical scheme provided by the invention, the inverter is directly and electrically connected with the power battery for providing the high-voltage direct current, so that the inverter can directly receive the direct current with relatively high voltage, a boosting module does not need to be additionally arranged in the inverter, the structure of the inverter is simplified, the electric energy conversion efficiency is improved, and the overall size is reduced; and meanwhile, the inverter is directly and electrically connected with the power battery, so that the wire diameter and the length of a direct-current side wire harness of the inverter can be reduced, the wire harness cost is reduced, the loss of electric energy in the transmission process is reduced, and the electric energy transmission efficiency and the electric energy utilization rate are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply, and in particular to a power supply system and a vehicle. Background Art

[0002] With the continued surge in sales of new energy commercial vehicles and the increasing demand for electricity in consumers' homes, traditional low-voltage inverters are no longer able to meet the requirements of new energy commercial vehicles. In terms of power transmission, the traditional inverter system is as follows: the high-voltage DC power provided by the power battery is transmitted to the DC-DC module, which converts the high-voltage DC power to low-voltage DC power and transmits it to the low-voltage battery and low-voltage electrical equipment. The low-voltage battery transmits the low-voltage DC power to the inverter, which then boosts and inverts the low-voltage DC power internally and converts it into AC power for output.

[0003] However, the transmission loss during this process is high, and the inverter power is limited by the capacity of the low-voltage battery and the DC-DC power. This results in low energy conversion efficiency and high costs. Improving the energy conversion efficiency and energy utilization of the inverter system has become a pressing technical issue. Summary of the Invention

[0004] The present invention provides a power supply system and a vehicle, which can reduce the loss of electric energy during transmission, improve the power transmission efficiency and power utilization rate, and improve the power conversion efficiency.

[0005] In a first aspect, the present invention provides a power supply system, comprising:

[0006] Power battery, used to provide high-voltage direct current;

[0007] An inverter is electrically connected to the power battery and is used to convert the high-voltage direct current into alternating current.

[0008] Optionally, the high voltage direct current is U1;

[0009] Among them, 300V≤U1≤930V.

[0010] Optionally, the power supply system further includes: a fault detection module;

[0011] The fault detection module is electrically connected to the inverter, and is used to obtain a fault state of the inverter.

[0012] Optionally, the fault detection module includes at least one of an overcurrent detection unit, an overvoltage detection unit and an overtemperature detection unit.

[0013] Optionally, the power supply system also includes:

[0014] A controller is electrically connected to the fault detection module and the inverter respectively; the controller is used to adjust the working state of the inverter according to the fault state.

[0015] Optionally, the power supply system also includes:

[0016] A fault display module is electrically connected to the fault detection module; the fault display module is used to display the fault status.

[0017] Optionally, the power supply system further includes: a manual switch and a PWM drive module;

[0018] The manual switch is electrically connected to the PWM drive module, and the PWM drive module is also electrically connected to the inverter.

[0019] In a second aspect, the present invention provides a vehicle comprising the power supply system described in the first aspect.

[0020] Optional vehicles include:

[0021] The chassis includes a first surface and a second surface; the first surface is provided with a cockpit, and the second surface is provided with the power supply system.

[0022] Optionally, the inverter includes a DC input terminal, an AC output terminal and a communication port;

[0023] The DC input end is electrically connected to the power battery, the AC output end is electrically connected to the electrical equipment located on the first surface through the chassis, and the communication port is electrically connected to the controller.

[0024] The technical solution provided by the present invention is to set the inverter to be directly electrically connected to the power battery that provides high-voltage direct current, so that the inverter can directly receive direct current with a higher voltage. There is no need to add a boost module inside the inverter, which simplifies the structure of the inverter, reduces the overall volume of the inverter, and facilitates miniaturization and lightweighting. At the same time, the inverter is directly electrically connected to the power battery, which can reduce the wire diameter and length of the inverter DC side wiring harness, reduce the wiring harness cost, reduce the loss of electric energy during transmission, improve the power transmission efficiency and power utilization rate, and improve the power conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a power supply system provided in an embodiment of the present invention;

[0026] Figure 2 A schematic structural diagram of another power supply system provided in an embodiment of the present invention;

[0027] Figure 3 A schematic structural diagram of another power supply system provided in an embodiment of the present invention;

[0028] Figure 4 A schematic structural diagram of another power supply system provided in an embodiment of the present invention;

[0029] Figure 5 A schematic structural diagram of a power supply system provided in an embodiment of the present invention;

[0030] Figure 6 A schematic structural diagram of another power supply system provided in an embodiment of the present invention;

[0031] Figure 7 A schematic diagram of a partial structure of a vehicle provided by an embodiment of the present invention;

[0032] Figure 8 A schematic structural diagram of an inverter provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0034] Figure 1 A schematic diagram of a power supply system according to an embodiment of the present invention is shown in FIG. Figure 1 As shown, the power supply system 100 includes a power battery 10 and an inverter 20. The power battery 10 is used to provide high-voltage direct current. The inverter 20 is electrically connected to the power battery 10 and is used to convert the high-voltage direct current into alternating current.

[0035] The power battery 10 may include a lithium iron phosphate battery or a ternary lithium battery, etc., and may be configured according to actual needs, without specific limitation herein. In an optional embodiment, the high-voltage direct current provided by the power battery 10 is U1, where 300V ≤ U1 ≤ 930V. When U1 is less than 300V, after the inverter 20 converts the DC power into AC power, the low U1 may cause the converted AC power waveform to be distorted and unable to meet the load requirements. When U1 is greater than 930V, overvoltage damage may occur to power devices such as MOS transistors, preventing voltage conversion. Therefore, by setting U1 to a value range of 300V to 930V, the converted power by the inverter 20 can ensure that the power can meet the load requirements. This also simplifies the internal structure of the inverter 20, eliminating the need for a boost structure within the inverter 20, while still providing higher-voltage DC power. The inverter 20 may include a full-bridge PWM circuit to achieve AC / DC isolation.

[0036] Specifically, by providing an inverter 20 that is directly electrically connected to the power battery 10 to receive the high-voltage DC power provided by the power battery 10, the inverter 20 eliminates the need for a boost module. The received high-voltage DC power can be converted into AC power for output, and the AC power can then be supplied to AC-powered devices to power them. This improves power conversion efficiency, reduces power transmission paths, increases power utilization, and reduces power loss.

[0037] The technical solution provided by the present invention is to set the inverter to be directly electrically connected to the power battery that provides high-voltage direct current, so that the inverter can directly receive direct current with a higher voltage. There is no need to add a boost module inside the inverter, which simplifies the structure of the inverter, reduces the overall volume of the inverter, and facilitates miniaturization and lightweighting. At the same time, the inverter is directly electrically connected to the power battery, which can reduce the wire diameter and length of the inverter DC side wiring harness, reduce the wiring harness cost, reduce the loss of electric energy during transmission, improve the power transmission efficiency and power utilization rate, and improve the power conversion efficiency.

[0038] Optional, Figure 2 A schematic diagram of another power supply system according to an embodiment of the present invention is shown in FIG. Figure 2 As shown, the power supply system 100 further includes a fault detection module 30 ; the fault detection module 30 is electrically connected to the inverter 20 , and the fault detection module 30 is used to obtain a fault state of the inverter 20 .

[0039] Among them, the fault detection module 30 includes a fault detection circuit or a fault detection device, etc., which can be set according to actual needs and is not specifically limited here. The fault state includes at least one of an overcurrent state, an overvoltage state, an overtemperature state, etc.

[0040] Specifically, by setting a fault detection module 30 electrically connected to the inverter 20, the fault detection module 30 can obtain the fault status of the inverter 20 in real time, and then remind the driver or maintenance personnel to maintain or repair the inverter 20 to ensure normal power supply of the power supply system 100.

[0041] Optional, Figure 3 A schematic diagram of a power supply system according to an embodiment of the present invention is shown in FIG. Figure 3 As shown, the fault detection module 30 includes at least one of an overcurrent detection unit 31 , an overvoltage detection unit 32 and an overtemperature detection unit 33 .

[0042] Among them, the overcurrent detection unit 31 includes an overcurrent detection circuit or an overcurrent detection device, etc., the overvoltage detection unit 32 includes an overvoltage detection circuit or an overvoltage detection device, etc., and the overtemperature detection unit 33 includes overtemperature detection devices such as thermocouples and thermal sensors. They can be set according to actual needs and are not specifically limited here.

[0043] Specifically, when the inverter 20 is in an overcurrent state for a long time, the high current may burn some circuits, thereby affecting the normal operation of the inverter 20. When the inverter 20 is in an overvoltage state, some components in the inverter 20 may not be able to withstand the high voltage and may burn, affecting the normal operation of the inverter 20. When the inverter 20 is in an overtemperature state, the high temperature may burn some components or circuits in the inverter 20, thereby causing abnormal operation of the inverter 20. By providing an overcurrent detection unit 31, it is possible to detect in real time whether the inverter 20 is in an overcurrent state. By providing an overvoltage detection unit 32, it is possible to detect in real time whether the inverter 20 is in an overvoltage state. By providing an overtemperature detection unit 33, it is possible to detect in real time whether the inverter 20 is in an overtemperature state. In this way, the inverter 20 can be maintained or repaired in a targeted manner based on the fault state of the inverter 20, thereby improving the maintenance rate of the inverter 20.

[0044] Optional, Figure 4 A schematic diagram of a power supply system according to an embodiment of the present invention is shown in FIG. Figure 4 As shown, the power supply system 100 further includes a controller 40 , which is electrically connected to the fault detection module 30 and the inverter 20 , respectively. The controller 40 is configured to adjust the working state of the inverter 20 according to the fault state.

[0045] The working state of the inverter 20 includes an active state and a shutdown state. The active state indicates that the inverter 20 can convert high-voltage direct current into alternating current, and the shutdown state indicates that the inverter 20 stops converting high-voltage direct current into alternating current.

[0046] Specifically, by setting a controller 40 electrically connected to the fault detection module 30, the controller 40 can obtain the working status of the inverter 20 in real time, so that when the inverter 20 is in a fault state of overtemperature, overvoltage or overcurrent, the controller 40 can adjust the operating frequency of the inverter 20 or control the inverter 20 to shut down, etc., to avoid the inverter 20 being in a fault state for a long time, thereby burning the inverter 20, reducing the damage rate of the inverter 20, and extending the service life of the inverter 20.

[0047] Optional, Figure 5 A schematic diagram of a power supply system according to an embodiment of the present invention is shown in FIG. Figure 5 As shown, the power supply system 100 further includes a fault display module 50 , which is electrically connected to the fault detection module 30 ; the fault display module 50 is used to display the fault status.

[0048] The fault display module 50 includes display devices such as a display screen and an instrument panel, which can be configured according to actual needs and are not specifically limited here.

[0049] Specifically, a fault display module 50 electrically connected to the fault detection module 30 is provided to display the fault status of the inverter 20 in real time through the fault display module 50, and a fault signal is provided to the maintenance personnel at the first moment when the fault status occurs, so that the maintenance personnel can maintain the inverter 20 according to the fault signal, thereby improving the timeliness of maintenance and extending the service life of the inverter 20.

[0050] Optional, Figure 6 A schematic diagram of another power supply system according to an embodiment of the present invention is shown in FIG. Figure 6 As shown, the power supply system 100 further includes a manual switch K1 ; the manual switch K1 is electrically connected to the PWM drive module 201 , and the PWM drive module 201 is also electrically connected to the inverter 20 .

[0051] The manual switch K1 includes a switch device such as a relay, and can be set according to actual needs, which is not specifically limited here.

[0052] Specifically, the PWM drive module 201 is used to provide the PWM switching signals required for inversion to the inverter 20, thereby controlling the inverter 20 to maintain an inversion state. By providing a manual switch K1 electrically connected to the inverter 20 and the PWM drive module 201, respectively, when maintenance personnel need to perform maintenance on the inverter 20 or when the power supply system is shut down while the inverter 20 is still in the inversion state, they can manually control the manual switch K1 to be disconnected to stop the inverter 20. This ensures maintenance safety, effectively avoids energy waste, and reduces power loss.

[0053] Based on the same inventive concept, the present invention also provides a vehicle, including the power supply system 100 provided by any embodiment of the present invention, which has the same technical features and the same beneficial effects as the power supply system 100. Please refer to the above description and will not repeat it here.

[0054] It should be noted that the inverter in the related art is located in the vehicle's cockpit, while the low-voltage battery that provides power to the inverter is located on the side of the chassis away from the cockpit. Therefore, the inverter's DC wiring harness needs to pass through the chassis to be electrically connected to the low-voltage battery, and the connecting wiring harness is long and thick. The inverter is installed in the cockpit, taking up space in the cockpit. At the same time, it generates heat and noise when working, affecting the driving experience and passenger experience. In addition, when the inverter power is high, the diameter of the wiring harness electrically connected to the inverter is large, and it cannot enter the cab from the vehicle's front docking box. It is necessary to drill a hole in the bottom of the cockpit, and the wiring harness is long and the cost is high.

[0055] Optional, Figure 7 A schematic diagram of a partial structure of a vehicle provided by an embodiment of the present invention, such as Figure 7 As shown, the vehicle includes a chassis 60 , and the chassis 60 includes a first surface 61 and a second surface 62 ; the first surface 61 is provided with a cockpit, and the second surface 62 is provided with a power supply system 100 .

[0056] The material of the chassis 60 includes aluminum alloy, steel alloy, carbon fiber or glass fiber, etc., which can be set according to actual needs and is not specifically limited here.

[0057] Specifically, the cockpit houses the driver's seat, steering wheel, and other equipment. The power supply system 100 is located on the side of the chassis 60 facing away from the cockpit. This allows for shorter wiring harnesses in the power supply system 100 that connect to the inverter 20, resulting in a more compact overall structure. This improves the utilization of the space on one side of the chassis 60, reduces vehicle weight, and reduces costs.

[0058] Optional, Figure 8 A schematic diagram of the structure of an inverter provided by an embodiment of the present invention is shown in FIG. Figure 8 As shown, the inverter 20 includes a DC input terminal 21, an AC output terminal 22 and a communication port 23; the DC input terminal 21 is electrically connected to the power battery 10, the AC output terminal 22 is electrically connected to the electrical equipment located on the first surface 61 through the chassis 60, and the communication port 23 is electrically connected to the controller 40.

[0059] Among them, the electrical equipment includes air conditioners, refrigerators, induction cookers or water heaters, etc. The communication port 23 supports other communication protocols such as CAN communication and can be set according to actual needs, which is not specifically limited here. In an optional embodiment, the power supply voltage required by the electrical equipment is 220V AC, which can also be other, which is not specifically limited here.

[0060] Specifically, the inverter 20 is electrically connected to the power battery 10 via the DC input terminal 21 to receive high-voltage DC power from the power battery 10. The inverter 20 outputs AC power to the power-consuming device via the AC output terminal 22. The inverter 20 is electrically connected to the controller 40 via the communication port 23 to receive control signals from the controller 40, thereby adjusting the current operating frequency or operating state. The driver can control the inverter's operating state through the vehicle computer and the controller 40, improving control convenience and reliability.

[0061] In other optional embodiments, the power supply system 100 also includes a leakage current detection circuit to detect the leakage of the inverter 20 through the leakage current detection circuit, and report in time when leakage occurs in the inverter 20 to remind the driver to turn off the inverter to avoid personal injury caused by leakage and ensure the personal safety of the driver and passengers.

[0062] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations, and substitutions are possible for those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power supply system, characterized in that: include: Power battery, used to provide high-voltage direct current; An inverter is electrically connected to the power battery and is used to convert the high-voltage direct current into alternating current.

2. The power supply system according to claim 1, characterized in that: The high voltage direct current is U1; Among them, 300V≤U1≤930V.

3. The power supply system according to claim 1, wherein: Also includes: Fault detection module; The fault detection module is electrically connected to the inverter, and is used to obtain a fault state of the inverter.

4. The power supply system according to claim 3, characterized in that: The fault detection module includes at least one of an overcurrent detection unit, an overvoltage detection unit, and an overtemperature detection unit.

5. The power supply system according to claim 3, characterized in that: Also includes: a controller, electrically connected to the fault detection module and the inverter respectively; The controller is used to adjust the working state of the inverter according to the fault state.

6. The power supply system according to claim 3, characterized in that: Also includes: a fault display module, electrically connected to the fault detection module; The fault display module is used to display the fault status.

7. The power supply system according to claim 1 or 3, characterized in that: Also includes: Manual switch and PWM drive module; The manual switch is electrically connected to the PWM drive module, and the PWM drive module is also electrically connected to the inverter.

8. A vehicle, characterized in that: A power supply system comprising any one of claims 1 to 7.

9. The vehicle according to claim 8, characterized in that include: The chassis includes a first surface and a second surface; the first surface is provided with a cockpit, and the second surface is provided with the power supply system.

10. The vehicle according to claim 9, characterized in that The inverter includes a DC input terminal, an AC output terminal and a communication port; The DC input end is electrically connected to the power battery, the AC output end is electrically connected to the electrical equipment located on the first surface through the chassis, and the communication port is electrically connected to the controller.

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