Background
With the continuous development of new energy automobiles, the problem of continuous voyage of the new energy automobiles is increasingly prominent. At present, in order to solve the problem of continuous voyage of a new energy automobile, the schemes of charging stations and power exchanging stations are practically applied. Although the concept of wirelessly charging automobiles has also been proposed, no large-scale application is currently commercially available. Because the power exchange station needs to store a large amount of batteries, and the battery specifications are not uniform among different manufacturers, great difficulties exist in construction, scheduling and the like of the power exchange station. From a practical point of view, the current mainstream solution is to still charge the station.
However, charging stations still have the following problems: if the charging station is large in scale, a certain place is required to be occupied, which makes the charging station cost high especially in urban centers and the like; if the charging station is small in scale, the charging piles are small in number, so that the requirements cannot be met. In addition, there are cases where an electric vehicle cannot reach a charging station before the electric power is exhausted due to a battery problem or an estimation error for the remaining mileage. In this case, moving the charging carriage is complete.
When the mobile charging trolley charges the vehicle, it serves as a power supply device; when the electric quantity of the mobile charging trolley is insufficient and the mobile charging trolley needs to be charged, the mobile charging trolley is used as power receiving equipment, and the electric quantity is acquired from the charging pile. In order to connect with different devices, the current mobile charging trolley is provided with a charging gun to charge the vehicle, and when the self-electricity quantity is insufficient, the mobile charging trolley needs to be charged by using the charging gun arranged on the charging pile. That is, both the mobile charging trolley and its dedicated charging post need to be equipped with charging guns, which creates unnecessary system redundancy and waste.
Disclosure of Invention
In order to solve the technical problems, the invention provides the following technical scheme:
a mobile charging cart, comprising:
a battery pack;
the charging system is connected with the battery pack and comprises a charger and a charging gun, and the charger comprises a controller;
after the charging gun is connected with the external equipment, the controller sends a charger handshake message, judges the type of the external equipment according to the type of the received message, and determines whether the battery pack is powered on or powered off based on the type of the external equipment.
According to one aspect of the invention, the external devices include social vehicles and smart charge piles; when the controller receives the vehicle handshake message, the external equipment connected with the charging gun is judged to be a social vehicle, and when the controller receives the charging pile handshake message, the external equipment connected with the charging gun is judged to be an intelligent charging pile.
According to one aspect of the invention, the charging gun is provided with the direct current contactor, after the controller judges that the external equipment connected with the charging gun is the intelligent charging pile, the charging gun closes the direct current contactor, then the controller periodically sends a direct current contactor closing instruction, and after receiving a direct current contactor closing success message sent by the intelligent charging pile, a starting command is sent to the intelligent charging pile to start insulation detection.
According to one aspect of the invention, the charger further comprises a bidirectional DC/DC, and the bidirectional DC/DC adopts a Buck/Boost circuit.
According to an aspect of the present invention, when the controller determines that the connected external device is a social vehicle, the controller controls the bidirectional DC/DC to operate in a Buck mode so that the battery pack of the mobile charging cart charges the social vehicle; when the controller judges that the connected external equipment is the intelligent charging pile, the controller controls the bidirectional DC/DC to work in a Boost mode, so that the intelligent charging pile charges a battery pack of the mobile charging trolley.
The invention has the following technical effects:
after the charging gun of the mobile charging trolley is connected with the external equipment, a controller of the mobile charging trolley sends a message, and then the type of the connected equipment is judged according to the type of the received message, so that whether a battery pack of the mobile charging trolley is discharged or powered on is determined. Therefore, two charging guns are not required to be arranged, redundancy of the charging guns is avoided, and cost is saved.
Detailed Description
The following describes the technical scheme of the present invention in detail with reference to the accompanying drawings.
Referring to fig. 1, the mobile charging cart of the present invention includes a battery pack and a charging system. The charging system comprises a charger and a charging gun, and the charger further comprises a controller. The mobile charging trolley also comprises bidirectional DC/DC because the same charging gun is required to be used for different application scenes. Preferably, the bi-directional DC/DC employs Buck/Boost circuitry. The charging system is connected with the battery pack through a charger, the bidirectional DC/DC in the charger is connected with a charging gun, and the charging gun is connected with external equipment. Specifically, the external device may be an intelligent charging stake or a social vehicle.
The charging gun has the same structure as the charging gun in the prior art. For example, it may include a direct current power supply line, a device ground line, a charging communication line, a charging connection confirmation line, and a low voltage auxiliary power supply line. When the charging gun is connected with an external device, the charging system is not aware of the type of the connected device, and the level change can be judged through the corresponding port of the low-voltage auxiliary power supply line. For example, when 4V is detected, the charging gun may be considered to have been successfully connected to an external device, at which time the charging gun and the external device may be locked, and the low-voltage auxiliary power supply may be turned on. And then, the charging system sends a charger handshake message to the connected equipment through the controller.
The charging system then interprets the type of device connected based on the message received by the controller. Specifically, if the controller receives a vehicle handshake message, it may be determined that the connected device is a social vehicle; if the controller receives the charging pile handshake message, the controller can judge that the connected equipment is an intelligent charging pile.
Specifically, the controller receives the vehicle handshake message because if the connected external device is a social vehicle, the process of insulation detection, charging handshake identification, charging parameter configuration, charging state entering and the like, which are performed later, is not different from the process of charging the social vehicle by the charging stake in the prior art according to the existing technical standards, for example, the communication protocol between the non-vehicle-mounted conductive charger and the battery management system of the GB/T27930-2015, the social vehicle replies to the vehicle handshake message after receiving the charger handshake message, and the controller determines that the connected external device is the social vehicle after receiving the message.
The controller receives the charging pile handshake message because if the connected external device is an intelligent charging pile, the charging pile handshake message is transmitted after the charging gun is physically connected with the intelligent charging pile and after the charging pile detects the level change of the corresponding port of the low-voltage auxiliary power supply line. Therefore, the controller in the mobile charging trolley receives the charging pile handshake message, thereby determining that the connected external equipment is an intelligent charging pile.
Insulation detection may then be performed. Specifically, the charging gun and the intelligent charging pile are both provided with direct current contactors. First, the charging gun closes the direct current contactor, and then the controller periodically sends a direct current contactor closing instruction. And after the intelligent charging pile receives the direct current contactor closing instruction, closing the direct current contactor, and replying a successful closing message of the direct current contactor. And after receiving a successful message of closing the direct-current contactor, the controller of the mobile charging trolley sends a starting command to start insulation detection. Then the intelligent charging pile receives the starting command message, the voltage rises to the charging voltage, for example 650V, and the starting success is recovered. After the charging gun is insulated, the controller receives a successful starting message, and starts the power module after a certain time (for example, 10 s) is delayed, so as to start the charging process.
When the controller determines that the external device to which the mobile charging cart is connected is a social vehicle or an intelligent charging pile, a corresponding operation is performed through bidirectional DC/DC. Specifically, when the controller determines that the connected external device is a social vehicle, the controller controls the bidirectional DC/DC to operate in a Buck mode, wherein Vin > Vout, and current flows from the battery pack of the mobile charging trolley to the social vehicle, so that the battery pack of the mobile charging trolley charges the social vehicle; when the controller judges that the connected external equipment is the intelligent charging pile, the controller controls the bidirectional DC/DC to work in a Boost mode, vin < Vout of the bidirectional DC/DC at the moment, and current flows from the intelligent charging pile to a battery pack of the mobile charging trolley, so that the intelligent charging pile charges the battery pack of the mobile charging trolley.
In the process of charging the social vehicle by the mobile charging trolley, judging whether to end charging by a battery management system of the social vehicle according to whether the charging process is normal, whether the battery state reaches a charging end condition set by the battery management system of the social vehicle and whether a charging machine of the mobile charging trolley stops charging messages are received; and the charger of the mobile charging trolley judges whether to end charging according to whether a charging stopping instruction is received, whether a charging process is normal, whether a manually set charging parameter value is reached, whether a charging stopping message of a battery management system of the social vehicle is received or not.
In the process of charging the mobile charging trolley by the intelligent charging pile, judging whether to end charging by a charger of the mobile charging trolley according to whether the charging process is normal, whether the battery state reaches the charging end condition set by the charger of the mobile charging trolley and whether a charging stopping message of the intelligent charging pile is received; and the intelligent charging pile judges whether to end charging according to whether a charging stopping instruction is received, whether a charging process is normal, whether a manually set charging parameter value is reached, and whether a charging machine of the mobile charging trolley stops charging messages is received.
Therefore, the mobile charging trolley judges the type of equipment connected with the charging gun through the type of the message received by the controller, so as to determine whether to receive power or discharge. Therefore, the mobile charging trolley can be connected with a social vehicle or an intelligent charging pile only by being provided with one charging gun, so that redundancy of the charging gun is avoided, and the cost is saved.
The foregoing has been a clear description of specific embodiments of the present invention. Of course, the foregoing description is only exemplary embodiments of the invention regarding its spirit and principles. It will be apparent to those skilled in the art that various changes may be made to the described examples and equivalents thereof without departing from the spirit and principles of the invention, which are intended to be within the scope of the invention as defined in the following claims.