Charging control method and electric vehicle using same

Abstract

Embodiments of the present invention provide a charging control method and an electric vehicle using same. The charging control method is used for controlling a charging process of an electric vehicle, and comprises the following steps: S1, detecting whether a charging gun is connected to a charging port of the electric vehicle; S2, in response to detecting the connection of the charging gun, a controller starting an inspection module to inspect a battery management module; and S3, in response to the battery management module passing the inspection, the controller detecting a maximum current allowed to pass through the charging gun and initiating charging. In the charging control method provided in the embodiments of the present invention, by employing the inspection module and inspecting the charging circuit of the electric vehicle upon a charging connection, the availability of the charging function of the vehicle is ensured, and when a charging fault occurs, the fault cause and location can be identified more quickly and accurately.

Description

Charging control method and electric vehicle using the same TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, and in particular to a charging control method and an electric vehicle using the same. BACKGROUND

[0002] With the development of electric generators, electric vehicles are increasingly widely used and are increasingly closely connected to people's daily life. However, the daily use of electric vehicles also brings some troubles and problems. One of the most critical problems is charging. In addition to concerns about charging speed, the current understanding of the chargeable state of the electric vehicle itself is still lacking, so that once a charging failure occurs, the fault location cannot be accurately located, and thus the charging experience of the user is affected. SUMMARY

[0003] In view of the deficiencies in the prior art, the present application provides a charging control method and an electric vehicle using the same, which solves the problem of lack of detection of the chargeability of the electric vehicle in the prior art.

[0004] In a first aspect, according to an embodiment of the present application, a charging control method is provided for controlling the charging process of an electric vehicle, the charging control method comprising the following steps: S1, detecting whether a charging gun is connected to a charging port of the electric vehicle; S2, in response to detecting the connection of the charging gun, starting a verification module for verifying a battery management module by a controller; S3, in response to the verification of the battery management module being qualified, detecting the maximum current allowed by the charging gun and charging by the controller.

[0005] According to an embodiment of the present application, detecting whether the charging gun is connected to the charging port of the electric vehicle is detecting the level value of the charging connection signal at the charging port.

[0006] According to an embodiment of the present application, when the level value is 0.5V, the charging connection signal indicates complete connection.

[0007] According to an embodiment of the present application, the verification of the verification module for the battery management module includes verification of the charging circuit, the battery health state, and the battery temperature.

[0008] According to an embodiment of the present application, the verification being qualified means that the charging circuit functions normally, the battery life in the battery health state is not less than a preset life value, and the battery temperature is within a preset temperature range.

[0009] According to an embodiment of the present application, the maximum current allowed by the charging gun is detected by detecting a control pilot signal at the charging port, the control pilot signal being a pulse width modulation signal.

[0010] According to an embodiment of the present application, the duty cycle of the pulse width modulation signal indicates the maximum current.

[0011] The charging control method further comprises performing a charging test on the battery management module by the test module when charging.

[0012] According to an embodiment of the present application, the charging test comprises a test on charging voltage, charging current and temperature.

[0013] In a second aspect, according to another embodiment of the present application, there is provided an electric vehicle which adopts the charging control method as described in the first aspect to perform charging, the electric vehicle comprising a controller, a battery management module, a test module and a charging port.

[0014] The technical principle of the present application is that a test module is adopted, and after a charging connection is made, a charging circuit of the electric vehicle itself is tested to ensure the availability of the charging function of the vehicle itself, and to help locate the cause and position of a charging fault more quickly and accurately when the charging fault occurs. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 is a flow chart of a charging control method according to an embodiment of the present application. DETAILED DESCRIPTION

[0016] The technical solutions of the present application will be further described below in conjunction with the drawings and embodiments.

[0017] As described in the background section, the existing charging method lacks knowledge of the chargeability of the electric vehicle itself. In order to solve the above problem, as shown in Fig. 1, an embodiment of the present application proposes a charging control method for controlling the charging process of an electric vehicle, the charging control method comprising the following steps: S1, detecting whether a charging gun is connected to a charging port of the electric vehicle; S2, in response to detecting the connection of the charging gun, starting a test on a battery management module by a controller using a test module; S3, in response to the test on the battery management module being passed, detecting a maximum current allowed by the charging gun by the controller and performing charging. By adopting the above test module and performing a charging circuit test before charging, the availability of the charging function is ensured, and when a charging fault occurs, the cause and position of the fault can be located more quickly and accurately.

[0018] According to an embodiment of the present application, detecting whether the charging gun is connected to the charging port of the electric vehicle is detecting the level value of the charging connection signal at the charging port. It is well known that the interface types of the automobile charging pile include both AC and DC, AC is often referred to as slow charging, and DC is referred to as fast charging. The number of pins of the two interfaces is generally different. Taking slow charging as an example, it has 7 pins. Among them, the CC pin is responsible for connection detection, and once the charging pile and the charging port of the vehicle are successfully connected, it will send a charging connection signal. Taking a 16A charging gun as an example, when the charging port is not connected with the charging gun, the voltage of the monitoring point is +5V / 12V, indicating that the vehicle end and the pile end are not connected. When the charging gun is inserted, the voltage of the monitoring point is 1.8V, and the vehicle end control device judges that the vehicle is in a semi-connected state. When the level value is 0.5V, the charging connection signal indicates full connection.

[0019] According to an embodiment of the present application, the verification of the battery management module by the verification module includes verification of the charging circuit, the battery health state, and the battery temperature. The verification is qualified when the charging circuit functions normally, the battery life in the battery health state is not less than a preset life value, and the battery temperature is within a preset temperature range. When the charging circuit does not function normally, charging cannot be performed. However, if there is no indication to inform this situation, after directly performing charging connection, it is not possible to determine the source of the fault, the charging pile, the electric vehicle, or the connection between the two. In addition, it is also necessary to determine the battery life in the battery health state. Generally, only the battery with a battery life higher than the minimum battery life can be charged, and if this information is also lacking, the entire charging link can be normally connected and no other errors can occur. Generally, for different types of batteries, the minimum battery life can be different. For example, the minimum battery life of a lead-acid battery is usually 30% of the maximum life. In addition, sufficient attention should also be paid to the working temperature. Generally, the battery is provided with a working temperature range. However, in areas with extremely extreme environmental temperatures or when the battery temperature of the vehicle is not normal, charging should not be performed. For example, when the vehicle's heat dissipation function is problematic, charging can be unsafe.

[0020] According to an embodiment of the present application, detecting the maximum current allowed by the charging gun is detecting the control pilot signal at the charging port, and the control pilot signal is a pulse width modulation signal. The control pilot signal is obtained through the CP pin, and is used for communication between the charging pile and the controller and the battery management module.

[0021] According to an embodiment of the present application, the duty cycle of the pulse width modulation signal indicates the maximum current. For example, the frequency of the PWM waveform signal is 1 kHz, and the size of the duty cycle, i.e. the time of the high level, directly determines the size of the charging current. In addition, the amplitude of the PWM waveform signal can determine the working state of the charging pile. For example, 12V represents idle, 9V indicates that it has been connected, and 6V means that it is charging.

[0022] To further ensure the safety of the charging circuit during the charging process, according to an embodiment of the present application, the charging control method further comprises performing a charging test on the battery management module by the test module when charging. The charging test comprises a test on the charging voltage, the charging current and the temperature. Through real-time monitoring during charging, the safety of the entire charging process is ensured.

[0023] According to another embodiment of the present application, an electric vehicle is provided, which uses the charging control method as described above to perform charging, and the electric vehicle comprises a controller, a battery management module, a test module and a charging port.

[0024] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A charge control method for controlling a charging process of an electric vehicle, characterized by, The charging control method comprises the following steps: S1, detecting whether the charging gun is connected to the charging port of the electric vehicle; S2, in response to detecting the connection of the charging gun, starting the verification of the battery management module by the controller; S3, in response to the verification of the battery management module being qualified, detecting the maximum current allowed by the charging gun and charging by the controller.

2. The charge control method according to claim 1, characterized by, Detecting whether the charging gun is connected to the charging port of the electric vehicle is to detect the level value of the charging connection signal at the charging port.

3. The charge control method according to claim 2, characterized by, When the level value is 0.5V, the charging connection signal indicates complete connection.

4. The charge control method according to claim 3, characterized by, The verification of the battery management module by the verification module comprises the verification of the charging circuit, the battery health state and the battery temperature.

5. The charge control method according to claim 4, characterized by, The verification being qualified is that the charging circuit functions normally, the battery life in the battery health state is not less than the preset life value, and the battery temperature is within the preset temperature range.

6. The charge control method according to claim 1, characterized by, Detecting the maximum current allowed by the charging gun is to detect the control guide signal at the charging port, and the control guide signal is a pulse width modulation signal.

7. A charge control method according to claim 6, characterized by, The duty cycle of the pulse width modulation signal indicates the maximum current.

8. The charge control method according to claim 1, wherein Further comprising, when charging, performing charging verification on the battery management module by the verification module.

9. A charge control method according to claim 8, characterized by, The charging verification comprises the verification of the charging voltage, the charging current and the temperature.

10. An electric vehicle, which adopts the charging control method according to any one of claims 1-9 to charge, and comprises a controller, a battery management module, a verification module and a charging port.

Images