A charging control system and method for pure electric buses

Abstract

This invention discloses a charging control system and method for a pure electric bus, comprising a high-voltage electrical box, a low-voltage battery, and a charging switch. The high-voltage battery is housed in the high-voltage electrical box and connected to a DC-DC converter module. The DC-DC converter module is connected to a charging power supply. The high-voltage battery is also connected to a battery management system (BMS), which is connected to the low-voltage battery. A charging switch is installed on the connection circuit between the low-voltage battery and the BMS. When the charging switch is closed, the low-voltage battery provides activation power to the BMS, activating it. The BMS can also be connected to the auxiliary power supply of a standard charging gun, which provides activation power to the BMS, activating it as well. Once the BMS is activated and determines that the high-voltage battery is charging normally, the DC-DC converter module provides low-voltage power to the charging power supply. This system integrates power distribution control for both standard and non-standard charging guns.

Description

Technical Field

[0001] This invention relates to the field of charging technology for new energy pure electric buses, and in particular to a charging control system and method for pure electric buses. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Currently, with the increasing maturity of pure electric bus technology, pure electric buses have been widely promoted and used in the domestic market, and a large number of electric vehicles have been exported overseas. However, due to the differences between the charging standards of other countries and regions and the national standard, the control method of charging according to the national standard cannot achieve the charging standards of other countries and regions. In order to achieve the charging of other charging standards, new charging control methods need to be set up, which makes the charging control state more diverse and is not conducive to charging operation. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a charging control system and method for pure electric buses. This system can accommodate both standard and non-standard charging guns, effectively activate relevant components during the charging process, and ensure effective safety control during the charging process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] Firstly, a charging control system for a pure electric bus is proposed, including a high-voltage electrical box, a low-voltage battery, and a charging switch. The high-voltage battery is housed in the high-voltage electrical box and connected to a DC-DC module. The DC-DC module is connected to a charging power supply. The high-voltage battery is also connected to a battery management system (BMS), which is connected to the low-voltage battery. A charging switch is installed on the connection circuit between the low-voltage battery and the BMS. When the charging switch is closed, the low-voltage battery provides activation power to the BMS, activating it. The BMS can also be connected to the auxiliary power supply of a national standard charging gun, which provides activation power to the BMS, activating it as well. Once the BMS is activated and determines that the high-voltage battery is charging normally, the DC-DC module provides low-voltage power to the charging power supply.

[0007] Secondly, a charging control method for a pure electric bus charging control system, as proposed in the first aspect, is presented, including:

[0008] When charging a high-voltage battery using a national standard charging gun, the charging switch is turned off, and the auxiliary power of the national standard charging gun is used to provide activation power to the battery management system.

[0009] When a non-standard charging gun is used to charge a high-voltage battery, the charging switch is closed, and the low-voltage battery provides activation power to the battery management system.

[0010] Once the battery management system is activated and determines that the high-voltage battery is charging normally, the DC-DC module supplies low-voltage power to the charging power source.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] 1. This invention enables charging of pure electric buses using either national standard or non-national standard charging guns by setting up a low-voltage battery and a charging switch. It integrates national standard charging and European standard charging gun power distribution control, forming a unified technical route and achieving compatibility and adaptability of the low-voltage power distribution control system during the charging process.

[0013] 2. This invention specifies the working status of each electrical component during the charging process of a high-voltage battery, effectively utilizes the working performance and characteristics of each electrical component, and realizes the effective preservation of charging status information, which is beneficial to the maintenance of vehicle safety status.

[0014] 3. This invention defines the low-voltage power distribution control logic during the charging process, provides a standardized charging process control technology route, and realizes centralized, precise and effective control of electrical components.

[0015] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0017] Figure 1 The schematic diagram of the control system disclosed in Example 1 is shown. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0020] Example 1

[0021] This embodiment discloses a charging control system for a pure electric bus, such as... Figure 1As shown, it includes a high-voltage electrical box, a low-voltage battery, and a charging switch. The high-voltage electrical box contains a high-voltage battery, a DC-DC module, a battery management system, and other electrical components. The high-voltage battery is connected to the DC-DC module, which is connected to the charging power supply. The DC-DC module can convert the high-voltage DC power provided by the high-voltage battery into 24V low-voltage DC power and output it, thereby providing low-voltage power to the charging power supply D11.

[0022] The high-voltage battery is connected to both the national standard charging interface and the non-national standard charging interface. The national standard charging interface is used to connect to the national standard charging gun to charge the high-voltage battery, while the non-national standard charging interface is used to connect to the non-national standard charging gun to charge the high-voltage battery.

[0023] The high-voltage battery is also connected to the battery management system, which in turn is connected to the low-voltage battery. A charging switch is installed on the connection circuit between the low-voltage battery and the battery management system. When the charging switch is closed, the low-voltage battery provides activation power to the battery management system, activating it. The battery management system can also be connected to the auxiliary power supply of the national standard charging gun, which provides activation power to the battery management system, activating it. Once the battery management system is activated and determines that the high-voltage battery is charging normally, the DC-DC module provides low-voltage power to the charging power supply D11.

[0024] The DC-DC module is also connected to the other electrical components in the high-voltage electrical box. When the battery management system is activated and determines that the high-voltage battery is charging normally, the DC-DC module supplies power to the other electrical components in the high-voltage electrical box.

[0025] Specifically, the battery management system is compatible with 12V and 24V wide voltage wake-up functions. When the battery management system receives activation power, it is activated and sends charging status messages to the vehicle's CAN network. These messages include charging voltage, current, and temperature. The BMS determines whether the high-voltage battery is charging normally. If the high-voltage battery is charging normally, the DC-DC module outputs 24V low-voltage power to other electrical components in the high-voltage electrical box and also outputs 24V low-voltage power to the vehicle's external wiring. This power supply powers the vehicle's charging control circuit, preventing erroneous wake-up of other vehicle equipment and enabling more precise power distribution control during the charging process.

[0026] When a high-voltage battery is charged by a charging gun, if the charging voltage, charging current, temperature, etc. all meet the set requirements, the high-voltage battery is considered to be charging normally.

[0027] Other electrical components in the high-voltage electrical box include insulation testers, smoke alarm detectors, etc.

[0028] This embodiment uses a non-national standard charging gun, specifically a European standard charging gun, as an example to provide a detailed description of a charging control system for a pure electric bus.

[0029] During the charging process, the low-voltage components that need to work in a pure electric bus include the instrument cluster, remote monitoring terminal, and vehicle controller, while the high-voltage components include the integrated power supply, high-voltage electrical box, and battery liquid cooling unit. All of these components require the vehicle to provide low-voltage electricity in order to work.

[0030] The function of the integrated power supply is to convert the high-voltage DC power of the vehicle into low-voltage 24V DC power. The working power and wake-up power of the integrated power supply are shared power sources. The integrated power supply can work as long as the working power is available. The high-voltage power of the integrated power supply comes from the high-voltage battery in the high-voltage electrical box. The DC-DC module in the integrated power supply converts the high-voltage DC power provided by the high-voltage battery into low-voltage DC power, providing 24V DC power to the vehicle.

[0031] The high-voltage battery liquid cooling unit is designed for situations where the high-voltage battery requires separate heat dissipation. It is particularly suitable for situations where the high-voltage battery is fast-charging, and the high-voltage battery unit heats up too quickly, requiring the liquid cooling unit to cool it down. It typically operates during charging and has a high power consumption, so it needs to be directly powered by the DC-DC module in the integrated power supply, and a 150A fuse is required. The low-voltage output terminal of the DC-DC module in the integrated power supply is the output terminal of the integrated power supply. In this embodiment, the output terminal of the integrated power supply is connected to the power input terminal of the high-voltage battery liquid cooling unit, and the DC-DC module in the integrated power supply directly powers the high-voltage battery liquid cooling unit.

[0032] The charging power supply D11 is connected to the integrated power supply working circuit, the vehicle controller wake-up circuit, the instrument charging wake-up circuit, and the remote terminal charging wake-up circuit, respectively; the integrated power supply working circuit is connected to the integrated power supply working circuit; the vehicle controller wake-up circuit is connected to the vehicle controller wake-up circuit; the instrument charging wake-up circuit is connected to the instrument charging wake-up circuit; the remote terminal charging wake-up circuit is connected to the remote terminal charging wake-up circuit; the integrated power supply working circuit, the vehicle controller wake-up circuit, the instrument charging wake-up circuit, and the remote terminal charging wake-up circuit are connected in parallel.

[0033] The charging power supply D11 is also connected to the first working circuit and the second working circuit. The first working circuit is connected to the instrument working circuit, and the second working circuit is connected to the remote terminal working circuit and the vehicle controller working circuit.

[0034] The vehicle controller wake-up power supply is also connected to the ignition power supply D12.

[0035] The ignition power supply is also connected to the remote terminal ignition wake-up power supply and the instrument ignition wake-up power supply.

[0036] A relay K1 is set on the integrated power supply working circuit, a relay K2 is set on the first working circuit, a relay K3 is set on the second working circuit, and a relay K4 is set on the vehicle controller wake-up circuit. The ignition power supply is connected to the relay K4 to realize the connection between the vehicle controller wake-up power supply and the ignition power supply.

[0037] The vehicle controller has a working power supply and a wake-up power supply. Since it only has one wake-up power supply, during normal operation, the ignition power supply D12 supplies power to the vehicle controller's wake-up power supply D8. During charging, the relay K4 is activated, and the power supply D11 supplies power to D8. With both the working power supply and the wake-up power supply in operation, the vehicle controller can send vehicle information messages to the vehicle's CAN network.

[0038] The instrument cluster has working power and charging wake-up power. When both the charging wake-up power and the working power are present, the instrument cluster screen is set to not light up to avoid the instrument lighting up while charging. Only the instrument functions are activated, and vehicle information such as vehicle speed, mileage, and door open / close status are sent to the vehicle's CAN network.

[0039] The remote terminal has working power and charging wake-up power. When both working power and wake-up power are available, the remote terminal mainly receives and stores all message information during the charging process from the vehicle's CAN network. At the same time, it can send information to the remote monitoring platform in real time through its built-in data card.

[0040] The auxiliary power supply of the charging gun is not directly connected to the power distribution control circuit, but instead enters the high-voltage electrical box, which outputs a 24V low-voltage power supply for power distribution control during the charging process. This avoids problems such as the charging gun's output power voltage failing to activate the power distribution relay or the output power being too low to wake up other components.

[0041] The output of the integrated power supply is also connected to a low-voltage battery, and a switch is provided on the connection circuit between the integrated power supply and the low-voltage battery. This switch is a manual mechanical switch S1, which can charge the low-voltage battery through the DC-DC module in the integrated power supply.

[0042] During the charging process of a pure electric bus, from a safety perspective, the manual mechanical switch S1 is in the off state, meaning that the low-voltage battery does not supply power to the vehicle. This ensures that no other equipment in the vehicle is working while it is unattended and charging at high voltage, reducing energy consumption while ensuring the safety of the vehicle's electrical use.

[0043] When the vehicle is working normally, the manual mechanical switch S1 is in the closed state, and when the vehicle is in the starting state, the integrated power supply DC-DC provides power to the whole vehicle and charges the low-voltage battery at the same time; relays K1, K2, K3, and K4 are all normally closed contacts, and the integrated power supply, instrument, remote terminal, and vehicle controller can all work normally.

[0044] When charging a vehicle using a standard Chinese charging gun, disconnecting the charging switch allows the auxiliary power output from the standard charging gun to enter the high-voltage electrical box, which then outputs 24V power to supply charging power supply D11. When charging a vehicle using a European standard charging gun, since it does not have an auxiliary power output function, closing the charging switch allows the 24V low-voltage battery to provide power to the high-voltage electrical box, which then outputs 24V power to supply charging power supply D11.

[0045] When the vehicle is charging, the manual mechanical switch is in the off state, the charging power supply D11 is energized, and relays K1, K2, and K3 are energized. D11 supplies power to the integrated power supply working power supply D4, instrument working power supply D5, remote terminal working power supply D6, vehicle controller working power supply D7, and vehicle controller wake-up power supply D8. Through fuse D11, it supplies power to the instrument charging wake-up power supply D9 and the remote terminal charging wake-up power supply D10. The working power supply and wake-up power supply of the instrument, remote terminal, and vehicle controller are energized, and these three components are all working normally. The integrated power supply working power supply D4 is energized, the integrated power supply is working normally, and can provide 24V power to the vehicle. The DC-DC output terminal D3 of the integrated power supply provides power to the battery liquid cooling unit D0 and the low-voltage battery positive terminal D2.

[0046] In this embodiment, all power distribution lines are equipped with corresponding fuses to protect the circuit. The relays use relays with freewheeling diodes to prevent backflow of capacitive loads in low-voltage components during operation, which could cause other components to malfunction. Figure 1 The medium-thickness wire section uses large cables or copper busbars to conduct electricity according to insurance requirements, so as to achieve effective safety protection for high current.

[0047] The power distribution function disclosed in this embodiment can be integrated into the original power distribution box of the bus, forming a whole with the original wiring in the power distribution box. It can also be compatible with other power distribution functions according to actual needs, realizing the basic low-voltage power distribution and control functions of pure electric buses. This embodiment integrates national standard charging and non-national standard charging gun charging power distribution control, forming a unified technical route and realizing the compatibility and adaptability of the low-voltage power distribution control system during the charging process; it specifies the working status of each electrical component during the high-voltage battery charging process, effectively utilizes the working performance and characteristics of each electrical component, and realizes the effective storage of charging status information, which is conducive to the maintenance of vehicle safety status; it defines the low-voltage power distribution control logic during the charging process, providing a standardized charging process control technical route, realizing centralized, precise and effective control of electrical components; it takes into account the universality of high-power power distribution boxes in pure electric buses, expands functions on the basis of expanding the universal power distribution conditions of high-power power distribution boxes, and can achieve matching and compatibility with different power distribution requirements, thus giving greater play to versatility and compositeness.

[0048] Example 2

[0049] In this embodiment, a charging control method for a pure electric bus charging control system disclosed in Embodiment 1 is disclosed, comprising:

[0050] When charging a high-voltage battery using a national standard charging gun, the charging switch is turned off, and the auxiliary power of the national standard charging gun is used to provide activation power to the battery management system.

[0051] When a non-standard charging gun is used to charge a high-voltage battery, the charging switch is closed, and the low-voltage battery provides activation power to the battery management system.

[0052] Once the battery management system is activated and determines that the high-voltage battery is charging normally, the DC-DC module supplies low-voltage power to the charging power source.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A charging control system for a pure electric bus, characterized in that, The system includes a high-voltage electrical box, a low-voltage battery, and a charging switch. The high-voltage battery is housed in the high-voltage electrical box and connected to a DC-DC module. The DC-DC module is connected to a charging power source. The high-voltage battery is also connected to a battery management system (BMS), which is connected to the low-voltage battery. A charging switch is installed on the connection circuit between the low-voltage battery and the BMS. When the charging switch is closed, the low-voltage battery provides activation power to the BMS, activating it. The BMS can also be connected to the auxiliary power source of a standard charging gun, which provides activation power to the BMS, activating it as well. Once the BMS is activated and determines that the high-voltage battery is charging normally, the DC-DC module provides low-voltage power to the charging power source. The DCDC module is also connected to the other electrical components in the high-voltage electrical box. When the battery management system is activated and determines that the high-voltage battery is charging normally, the DCDC module supplies power to the other electrical components in the high-voltage electrical box. Specifically, the battery management system is compatible with 12V and 24V wide voltage wake-up functions. When the battery management system receives the activation power, it is activated and the BMS sends charging status message information to the vehicle CAN network. The charging status message information includes charging voltage, current, and temperature. The BMS determines whether the high-voltage battery is charging normally. When it is determined that the high-voltage battery is charging normally, the DCDC module outputs 24V low voltage power to the other electrical components in the high-voltage electrical box. When the high-voltage battery is charged by the charging gun, if the charging voltage, charging current and temperature all meet the set requirements, the high-voltage battery is considered to be charging normally. The high-voltage battery is connected to both the national standard charging interface and the non-national standard charging interface. The national standard charging interface is used to connect to the national standard charging gun to charge the high-voltage battery. The non-national standard charging interface is used to connect to the non-national standard charging gun to charge the high-voltage battery. When charging a high-voltage battery using a national standard charging gun, the charging switch is turned off, and the auxiliary power of the national standard charging gun is used to provide activation power to the battery management system. When a non-standard charging gun is used to charge a high-voltage battery, the charging switch is closed, and the low-voltage battery provides activation power to the battery management system.

2. The charging control system for a pure electric bus as described in claim 1, characterized in that, The charging power supply is connected to the integrated power supply working circuit, the vehicle controller wake-up circuit, the instrument charging wake-up circuit, and the remote terminal charging wake-up circuit, respectively; the integrated power supply working circuit is connected to the integrated power supply working circuit; the vehicle controller wake-up circuit is connected to the vehicle controller wake-up circuit; the instrument charging wake-up circuit is connected to the instrument charging wake-up circuit; and the remote terminal charging wake-up circuit is connected to the remote terminal charging wake-up circuit.

3. The charging control system for a pure electric bus as described in claim 2, characterized in that, The output terminal of the integrated power supply is connected to the power input terminal of the high-voltage battery liquid cooling unit.

4. The charging control system for a pure electric bus as described in claim 2, characterized in that, The output of the integrated power supply is also connected to a low-voltage battery, and a switch is provided on the connection circuit between the integrated power supply and the low-voltage battery.

5. A charging control system for a pure electric bus as described in claim 2, characterized in that, The vehicle controller wake-up power supply is also connected to the ignition power supply.

6. The charging control system for a pure electric bus as described in claim 5, characterized in that, The ignition power supply is also connected to the remote terminal ignition wake-up power supply and the instrument ignition wake-up power supply.

7. The charging control system for a pure electric bus as described in claim 1, characterized in that, The charging power supply is connected to the first working electrical circuit and the second working electrical circuit respectively. The first working electrical circuit is connected to the instrument working electrical circuit, and the second working electrical circuit is connected to the remote terminal working electrical circuit and the vehicle controller working electrical circuit respectively.

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