Electric commercial vehicle on-board charging and discharging control system

Abstract

The application discloses a kind of electric commercial vehicle on-board charging and discharging control system, by battery pack, high voltage distribution box, slow charging socket, whole vehicle controller, slow charging on-board controller and battery, battery pack is connected with high voltage distribution box, high voltage distribution box is connected with slow charging socket;The AC port of slow charging on-board controller is connected with slow charging socket, its DC port is connected with battery through relay contact, and high voltage distribution box is also connected with battery;Slow charging on-board controller is integrated with AC charging and discharging port, and whole vehicle controller, high voltage distribution box and slow charging on-board controller are connected by CAN bus.The application realizes with the function of charging, without preparing in advance charging and discharging gun head, and slow charging controller is configured to replace charging pile with vehicle, and space arrangement is more compact, not only improves charging and discharging efficiency, saves user use time, also greatly reduces the cost of a large number of hardware configuration.

Description

Technical Field

[0001] This invention relates to the field of electric commercial vehicle charging and discharging technology, and in particular to an on-board charging and discharging control system for electric commercial vehicles. Background Technology

[0002] Currently, the AC slow charging configuration of light trucks, namely single-phase AC 220V charging, is mainly configured as a high-voltage box integrating a slow charging OBC + charging socket + charging gun. Under normal circumstances, it does not have a slow charging and discharging function. Even if a slow charging and discharging function is available, the current method not only requires a discharge gun head, but also an external power supply to power the external slow charging controller (charging pile). This not only results in high hardware costs, but also places high demands on end users.

[0003] To elaborate, existing slow charging solutions for electric light trucks require a slow charging gun and an AC charging station plus an external power supply. Similarly, slow charging and discharging solutions also require a discharge gun and a discharge plug. In some cases, a discharge controller is also required, making the entire slow charging and discharging system complex and inconvenient for users. Summary of the Invention

[0004] In view of the above, the present invention aims to provide an on-board charging and discharging control system for electric commercial vehicles to solve the aforementioned technical problems.

[0005] The technical solution adopted in this invention is as follows:

[0006] This invention provides an on-board charging and discharging control system for electric commercial vehicles, including: a battery pack, a high-voltage distribution box, a slow charging socket, a vehicle controller, a slow charging on-board controller, and a battery;

[0007] The battery pack is connected to the high-voltage distribution box via a DC bus, and the high-voltage distribution box is connected to the slow-charging socket via an AC bus.

[0008] The AC port of the slow-charging vehicle controller is connected to the slow-charging socket, the DC port of the slow-charging vehicle controller is connected to the battery through the contacts of a relay, and the high-voltage distribution box is connected to the battery.

[0009] The slow-charging vehicle controller is equipped with a single-phase AC charging port, a single-phase AC discharging port, and a CAN bus interface.

[0010] The vehicle controller, the high-voltage power distribution box, and the slow-charging vehicle controller are connected via a CAN bus.

[0011] In at least one of the possible implementations, the single-phase AC charging port is a 220VAC charging port, and the single-phase AC discharging port is a 220VAC discharging port.

[0012] In at least one possible implementation, the single-phase AC charging port is a retractable plug.

[0013] In at least one of the possible implementations, the slow charging socket integrates a temperature sensor connected to the vehicle controller for measuring the temperature of the L-line in the AC bus.

[0014] In at least one possible implementation, the slow charging socket is further provided with a detection cable connected to the vehicle controller for detecting whether the slow charging gun is connected to the slow charging socket.

[0015] In at least one possible implementation, the DC port of the slow-charging vehicle controller is connected to the battery via relay contacts and a fuse.

[0016] Compared with existing technologies, the main design concept of this invention is that it consists of a battery pack, a high-voltage distribution box, a slow-charging socket, a vehicle controller, a slow-charging on-board controller, and a battery. The battery pack is connected to the high-voltage distribution box, which in turn is connected to the slow-charging socket. The AC port of the slow-charging on-board controller is connected to the slow-charging socket, and its DC port is connected to the battery via relay contacts. The high-voltage distribution box is also connected to the battery. The slow-charging on-board controller integrates an AC charging / discharging port. The vehicle controller, high-voltage distribution box, and slow-charging on-board controller are connected via a CAN bus. This invention solves the defects of traditional plug-in charging and discharging, allowing users to charge whenever needed without preparing charging / discharging guns in advance. Furthermore, the on-board slow-charging controller replaces the charging pile (an additionally configured slow-charging controller), resulting in a more compact space layout. This not only improves charging and discharging efficiency and saves user time but also significantly reduces the cost of configuring a large amount of hardware. It also solves the technical problem of needing to configure a discharge controller in certain situations. Actual testing shows that this invention can improve charging and discharging efficiency by 80% compared to traditional slow-charging solutions. Attached Figure Description

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram of an on-board charging and discharging control system for electric commercial vehicles provided in an embodiment of the present invention. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] This invention proposes an embodiment of an on-board charging and discharging control system for electric commercial vehicles, specifically, as follows: Figure 1 As shown, it includes: battery pack, high-voltage distribution box, slow charging socket, vehicle control unit (VCU), slow charging on-board controller and battery;

[0021] The battery pack is connected to the high-voltage distribution box via a DC bus, and the high-voltage distribution box is connected to the slow-charging socket via an AC bus.

[0022] The AC port of the slow-charging vehicle controller is connected to the slow-charging socket. The DC port of the slow-charging vehicle controller is connected to the battery through the contacts of relay K1 (which can be controlled by the vehicle controller, slow-charging vehicle controller, or battery management system in actual operation) and fuse FU. The high-voltage distribution box is connected to the battery. The battery provides DC power to the slow-charging vehicle controller, and the high-voltage distribution box is used to charge the battery.

[0023] To elaborate, relay K1 is the power relay of the slow-charging vehicle controller. When charging and discharging are required, relay K1 is energized, and the battery provides power to the slow-charging vehicle controller until the battery pack is fully charged. When the battery voltage reaches an undervoltage state and power needs to be replenished in time, relay K1 is deactivated, and the original relay inside the high-voltage distribution box is energized to start charging the battery until it is fully charged. Understandably, fuse FU serves to prevent short circuits and overloads, thus protecting the slow-charging vehicle controller.

[0024] Continuing from the previous text, the slow-charging vehicle controller is equipped with a single-phase AC charging port, a single-phase AC discharging port, a CAN bus interface, etc. In some preferred embodiments, the single-phase AC charging port is a 220VAC charging port and the single-phase AC discharging port is a 220VAC discharging port. Furthermore, the charging port preferably adopts a retractable plug to replace the traditional household power strip and plug, making it safer for users.

[0025] The vehicle controller, the high-voltage distribution box, and the slow-charging vehicle controller are connected via a CAN bus. The CAN bus can send a low-voltage command to the high-voltage distribution box to charge the battery in a timely manner.

[0026] It can be added that the slow charging socket integrates an NTC temperature sensor to measure the temperature of the L line in the AC bus. When the L line temperature is too high during charging and discharging, the NTC collects the temperature and feeds it back to the VCU. The VCU can then send a command to the slow charging vehicle controller, which in turn sends a command to the high-voltage distribution box to reduce the charging and discharging current, thereby reducing the temperature.

[0027] The slow charging socket is also equipped with a detection cable (CP and CC low-voltage lines shown in the figure) that is connected to the vehicle controller, which is used to detect whether the slow charging gun head is connected to the slow charging socket.

[0028] Finally, the working principle of the above-mentioned charging and discharging system scheme is explained as follows:

[0029] (1) 220VAC charging and discharging control strategy

[0030] After the vehicle is powered on at low voltage, the VCU is awakened and CAN communication is established. This triggers the original relay K2 in the high voltage distribution box to disconnect. The system checks whether relay K1 is engaged. Once engaged, the original relay in the battery management system is activated, and charging and discharging begin. Throughout the entire charging and discharging process, the charging and discharging gun can be continuously connected to the slow charging socket, eliminating the need to prepare and replace the charging and discharging gun heads.

[0031] (2) Battery charging and power-off strategies

[0032] After the vehicle is powered on at low voltage, the VCU is awakened and CAN communication is established. This triggers the original relay K2 in the high voltage distribution box to close. The system checks whether relay K1 is open. If it is confirmed to be open, the original relay in the battery management system will activate and start charging the battery. The charging process continues until the alarm voltage value is reached, at which point K2 is disconnected to end the battery charging process.

[0033] In summary, the main design concept of this invention is that it comprises a battery pack, a high-voltage distribution box, a slow-charging socket, a vehicle controller, a slow-charging on-board controller, and a battery. The battery pack is connected to the high-voltage distribution box, which in turn is connected to the slow-charging socket. The AC port of the slow-charging on-board controller is connected to the slow-charging socket, and its DC port is connected to the battery via relay contacts. The high-voltage distribution box is also connected to the battery. The slow-charging on-board controller integrates an AC charging / discharging port. The vehicle controller, high-voltage distribution box, and slow-charging on-board controller are connected via a CAN bus. This invention solves the shortcomings of traditional plug-in charging and discharging, allowing users to charge whenever needed without needing to prepare charging / discharging guns in advance. Furthermore, the on-board slow-charging controller replaces the charging pile (an additionally configured slow-charging controller), resulting in a more compact space layout. This not only improves charging and discharging efficiency and saves user time but also significantly reduces the cost of configuring a large amount of hardware. It also solves the technical problem of needing to configure a discharge controller in certain situations.

[0034] In this invention, when directional terms are mentioned, they are relative concepts based on the embodiments. Furthermore, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, A and B simultaneously, or B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0035] The above description of the structure, features, and effects of the present invention is based on the embodiments shown in the figures. However, the above are only preferred embodiments of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched by those skilled in the art to form a variety of equivalent solutions without departing from or changing the design concept and technical effects of the present invention. Therefore, the present invention is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of the present invention.

Claims

1. An on-board charging and discharging control system for electric commercial vehicles, characterized in that, include: Battery pack, high-voltage distribution box, slow charging socket, vehicle controller, slow charging vehicle controller and battery; The battery pack is connected to the high-voltage distribution box via a DC bus, and the high-voltage distribution box is connected to the slow-charging socket via an AC bus. The AC port of the slow-charging vehicle controller is connected to the slow-charging socket, and the DC port of the slow-charging vehicle controller is connected to the battery through the contacts of the power relay of the slow-charging vehicle controller. The high-voltage distribution box is connected to the battery and is used to charge the battery. When the power relay is energized, the battery provides power to the slow-charging vehicle controller until the battery pack is fully charged. The slow-charging vehicle controller is equipped with a single-phase AC charging port, a single-phase AC discharging port, and a CAN bus interface; wherein, the single-phase AC charging port and the single-phase AC discharging port are used to replace household power strips and plugs; The vehicle controller, the high-voltage power distribution box, and the slow-charging vehicle controller are connected via a CAN bus; The charge-discharge control system executes at least the following charge-discharge control strategies: After the vehicle is powered on with low voltage, the vehicle controller is woken up and CAN communication is established. This triggers the disconnection of the existing relay inside the high-voltage distribution box; Detect whether the power relay is engaged; Once the engagement is confirmed, the original relay in the battery management system is activated to begin charging and discharging. Throughout the entire charging and discharging process, the charging and discharging gun remains connected to the slow charging socket.

2. The on-board charging and discharging control system for electric commercial vehicles according to claim 1, characterized in that, The single-phase AC charging port is a 220VAC charging port, and the single-phase AC discharging port is a 220VAC discharging port.

3. The on-board charging and discharging control system for electric commercial vehicles according to claim 1, characterized in that, The single-phase AC charging port is a retractable plug.

4. The on-board charging and discharging control system for electric commercial vehicles according to claim 1, characterized in that, The slow charging socket integrates a temperature sensor connected to the vehicle controller for measuring the temperature of the L-line in the AC bus.

5. The on-board charging and discharging control system for electric commercial vehicles according to claim 4, characterized in that, The slow charging socket is also equipped with a detection cable that connects to the vehicle controller, used to detect whether the slow charging gun is connected to the slow charging socket.

6. The on-board charging and discharging control system for electric commercial vehicles according to any one of claims 1 to 5, characterized in that, The DC port of the slow-charging vehicle controller is connected to the battery via relay contacts and a fuse.

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