Charging circuit, charging method and vehicle

Abstract

The invention relates to a charging circuit, a charging method and a vehicle, the circuit comprises a control unit, a first charging branch, a second charging branch and a third relay, the first charging branch comprises a first relay, a control unit and a first battery, and the second charging branch comprises a second relay, a control unit and a second battery; the control unit is used for controlling the first relay and the third relay to be closed under the condition that a charging gun of the charging device is connected with the charging device connecting port so as to conduct the first charging branch circuit and enable the charging device to charge the first battery, and controlling the first relay and the third relay to be closed under the condition that the first charge state of the first battery reaches a first preset charge state threshold value. And controlling the first relay and the third relay to be switched off so as to disconnect the first charging branch and disconnect the charging identification contact of the charging device from the vehicle, and controlling the second relay and the third relay to be switched on so as to enable the charging device to charge the second battery.

Description

Technical Field

[0001] The present disclosure relates to the field of batteries, and in particular, to a charging circuit, a charging method and a vehicle. Background Art

[0002] With the rapid development of new energy vehicles, the convenience and efficiency of charging in vehicles have also become issues of concern to users and manufacturers.

[0003] At present, for DC charging of dual-pack parallel batteries, manual switching is required when switching the charging of parallel batteries. The switching operation is relatively cumbersome, and the charging efficiency and convenience are low, which affects the user experience. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present disclosure provides a charging circuit, a charging method and a vehicle.

[0005] According to a first aspect of an embodiment of the present disclosure, a charging circuit is provided, the circuit comprising: a control unit, a first charging branch, a second charging branch and a third relay, the first charging branch comprising a first relay, the control unit and a first battery, the first relay being connected to the first battery through the control unit, the second charging branch comprising a second relay, the control unit and a second battery, the second relay being connected to the second battery through the control unit; the third relay being connected to the control unit; the third relay being used to control the connection or disconnection between a charging identification contact of a charging gun in a charging device and a vehicle; the control unit being used to control the first relay and the third relay to be closed when the charging gun is connected to the vehicle through the charging identification contact, so as to conduct the first charging branch, so that the charging device charges the first battery, and to control the first relay and the third relay to be disconnected when the first state of charge of the first battery reaches a first preset state of charge threshold, so as to disconnect the first charging branch and disconnect the charging identification contact from the vehicle; and to control the second relay and the third relay to be closed to conduct the second charging branch and conduct the connection between the charging identification contact and the vehicle, so that the charging device charges the second battery.

[0006] Optionally, the control unit is used to control the second relay and the third relay to close after controlling the first relay and the third relay to be disconnected for a preset time period.

[0007] Optionally, the control unit is used to control the first relay and the third relay to close when the first state of charge of the first battery is less than a first preset state of charge threshold.

[0008] Optionally, the control unit is further used to control the second relay and the third relay to close so as to turn on the second charging branch when the first state of charge is equal to a first preset state of charge threshold and the second state of charge of the second battery is less than a second preset state of charge threshold, so that the charging device charges the second battery.

[0009] Optionally, the control unit is used to control the second relay and the third relay to disconnect when the second state of charge of the second battery reaches a second preset state of charge threshold, so as to disconnect the second charging branch and disconnect the charging identification contact from the vehicle.

[0010] Optionally, the charging circuit also includes a fourth relay and a fifth relay; the control unit is connected to the fourth relay and the fifth relay respectively; the fourth relay is used to connect the first battery and the power module of the charging device; the fifth relay is used to connect the second battery and the power module of the charging device; the control unit is used to control the on-off of the fourth relay according to the on-off of the first charging branch to control the start and end of charging of the first battery, and control the on-off of the fifth relay according to the on-off of the second charging branch to control the start and end of charging of the second battery.

[0011] Optionally, the control unit includes a first charging controller, which is connected to the fourth relay; the first charging controller is used to control the fourth relay to close when the first charging branch is turned on, and to control the fourth relay to open when the first charging branch is turned off.

[0012] Optionally, the control unit includes a second charging controller, which is connected to the fifth relay; the second charging controller is used to control the fifth relay to close when the second charging branch is turned on, and to control the fifth relay to open when the second charging branch is turned off.

[0013] According to a second aspect of an embodiment of the present disclosure, a charging method is provided, which is applied to a charging circuit. The circuit includes: a control unit, a first charging branch, a second charging branch and a third relay. The first charging branch includes a first relay, the control unit and a first battery, and the first relay is connected to the first battery through the control unit. The second charging branch includes a second relay, the control unit and a second battery, and the second relay is connected to the second battery through the control unit; the third relay is connected to the control unit; the third relay is used to control the connection or disconnection of a charging identification contact of a charging gun in a charging device with a vehicle; the method includes: when the charging gun is connected to the vehicle through the charging identification contact, controlling the first relay and the third relay to be closed to turn on the first charging branch so that the charging device charges the first battery; when the first state of charge of the first battery reaches a first preset state of charge threshold, controlling the first relay and the third relay to be disconnected to disconnect the first charging branch and disconnect the charging identification contact from the vehicle; controlling the second relay and the third relay to be closed to turn on the second charging branch and turn on the connection between the charging identification contact and the vehicle so that the charging device charges the second battery.

[0014] Optionally, controlling the second relay and the third relay to close to turn on the second charging branch includes: after controlling the first relay and the third relay to be disconnected for a preset time period, controlling the second relay and the third relay to close.

[0015] Optionally, controlling the first relay and the third relay to close to turn on the first charging branch includes: controlling the first relay and the third relay to close when a first state of charge of the first battery is less than a first preset state of charge threshold.

[0016] Optionally, the method also includes: when the first state of charge is equal to a first preset state of charge threshold and the second state of charge of the second battery is less than a second preset state of charge threshold, controlling the second relay and the third relay to close to turn on the second charging branch so that the charging device charges the second battery.

[0017] Optionally, the method further includes: when the second state of charge of the second battery reaches a second preset state of charge threshold, controlling the second relay and the third relay to disconnect so as to disconnect the second charging branch and disconnect the charging identification contact from the vehicle.

[0018] Optionally, the charging circuit also includes a fourth relay and a fifth relay; the control unit is connected to the fourth relay and the fifth relay, respectively; the fourth relay is used to connect the first battery and the power module of the charging device; the fifth relay is used to connect the second battery and the power module of the charging device; the method also includes: controlling the on-off of the fourth relay according to the on-off of the first charging branch to control the start and end of charging of the first battery; controlling the on-off of the fifth relay according to the on-off of the second charging branch to control the start and end of charging of the second battery.

[0019] Optionally, the control unit includes a first charging controller, and the first charging controller is connected to the fourth relay; controlling the on and off of the fourth relay according to the on and off of the first charging branch includes: when the first charging branch is turned on, controlling the fourth relay to close; or, when the first charging branch is turned off, controlling the fourth relay to turn off.

[0020] Optionally, the control unit includes a second charging controller, and the second charging controller is connected to the fifth relay; controlling the on and off of the fifth relay according to the on and off of the second charging branch includes: when the second charging branch is turned on, controlling the fifth relay to close; or, when the second charging branch is turned off, controlling the fifth relay to open.

[0021] According to a third aspect of an embodiment of the present disclosure, a vehicle is provided, comprising the charging circuit provided by the first aspect of the present disclosure.

[0022] Through the above technical solution, when the charging identification contact of the charging gun is connected to the vehicle, the first relay and the third relay can be controlled to close, the first charging branch can be turned on, so that the charging device charges the first battery through the charging gun, and when the first battery is fully charged, the first relay and the third relay can be controlled to disconnect to simulate the action of manually pulling out the charging gun, and the second relay and the third relay can be controlled to close to turn on the second charging branch to simulate the action of manually inserting the charging gun, so that the charging device charges the second battery through the charging gun. In this way, when the charging gun is connected to the vehicle, the relay connected to the charging gun can be controlled to connect or disconnect to simulate the action of manually plugging and unplugging the charging gun during charging, eliminating the manual switching operation when switching the charging of parallel batteries, improving the efficiency and convenience of charging, and enhancing the user experience.

[0023] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a schematic diagram of a charging circuit according to an exemplary embodiment.

[0025] Figure 2 is a schematic diagram of another charging circuit according to an exemplary embodiment.

[0026] Figure 3 is a schematic diagram of a third charging circuit according to an exemplary embodiment.

[0027] Figure 4 is a schematic diagram of a fourth charging circuit according to an exemplary embodiment.

[0028] Figure 5 The figure is a flow chart of a charging method according to an exemplary embodiment.

[0029] Figure 6 is a block diagram of a vehicle according to an exemplary embodiment.

[0030] Description of Reference Numerals 100-charging circuit; 101-control unit; 1011-first charging controller; 1012-second charging controller; 102-first battery; 103-second battery; S1-first charging branch; S2-second charging branch; CC1-charging identification contact; CC2-charging confirmation port; KM1-first relay; KM2-second relay; KM3-third relay; KM4-fourth relay; KM5-fifth relay. DETAILED DESCRIPTION

[0031] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0032] The terms "first", "second", etc. in the disclosed specification and claims and the above drawings are used to distinguish similar objects and do not have to be understood as a specific order or sequence. In addition, in the description with reference to the drawings, the same symbols in different drawings represent the same elements.

[0033] In the description of the present disclosure, unless otherwise specified, "multiple" means two or more than two, and other quantifiers are similar thereto; "at least one item", "one item or multiple items" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one item a can represent any number of a; for another example, one item or multiple items among a, b and c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple; "and / or" is a kind of description of the association relationship of associated objects, indicating that there can be three kinds of relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " indicates that the associated objects before and after are in an "or" relationship.

[0034] In the related technologies, with the rapid development of new energy vehicles, the convenience and efficiency of charging in vehicles have also become a concern for users and manufacturers. At present, for DC charging of dual-pack parallel batteries, manual switching is required when charging and switching the parallel batteries. The switching operation is relatively cumbersome, and the charging efficiency and convenience are low, which affects the user experience.

[0035] Therefore, in order to overcome the problems existing in the related art, the present disclosure provides a charging circuit, a charging method and a vehicle. The charging circuit can control the first relay and the third relay to close and conduct the first charging branch when the charging identification contact of the charging gun is connected to the vehicle, so that the charging device charges the first battery through the charging gun, and when the first battery is fully charged, the first relay and the third relay are controlled to be disconnected to simulate the action of manually pulling out the charging gun, and the second relay and the third relay are controlled to be closed to conduct the second charging branch to simulate the action of manually inserting the charging gun, so that the charging device charges the second battery through the charging gun. In this way, the action of manually plugging and unplugging the charging gun during charging can be simulated by controlling the connection or disconnection of the relay connected to the charging gun when the charging gun is connected to the vehicle, eliminating the manual switching operation when charging the parallel batteries, improving the efficiency and convenience of charging, and enhancing the user experience.

[0036] The present disclosure is described below in conjunction with specific embodiments.

[0037] Figure 1 is a schematic diagram of a charging circuit 100 according to an exemplary embodiment. Figure 1As shown, the circuit may include: a control unit 101, a first charging branch S1, a second charging branch S2 and a third relay KM3, the first charging branch S1 includes a first relay KM1, the control unit 101 and a first battery 102, the first relay KM1 is connected to the first battery 102 through the control unit 101, the second charging branch S2 includes a second relay KM2, the control unit 101 and a second battery 103, the second relay KM2 is connected to the second battery 103 through the control unit 101; the third relay KM3 is connected to the control unit 101; the third relay KM3 is used to control the connection or disconnection of the charging identification contact CC1 of the charging gun in the charging device with the vehicle; the control unit 101 , used to control the first relay KM1 and the third relay KM3 to close when the charging gun is connected to the vehicle through the charging identification contact CC1, so as to turn on the first charging branch S1, so that the charging device charges the first battery 102, and to control the first relay KM1 and the third relay KM3 to open when the first state of charge of the first battery 102 reaches a first preset state of charge threshold, so as to disconnect the first charging branch S1 and disconnect the charging identification contact CC1 from the vehicle, and to control the second relay KM2 and the third relay KM3 to close, so as to turn on the second charging branch S2 and turn on the charging identification contact CC1 from the vehicle, so that the charging device charges the second battery 103.

[0038] Among them, the charging device may include a power module, a charging pile controller and a charging gun. The power module may include an AC / DC power supply. When the charging gun is connected to the vehicle through the charging identification contact CC1, the charging pile controller confirms the connection relationship between the charging gun and the vehicle by monitoring the connection status between the charging identification contact CC1 and the vehicle. At the same time, the control unit 101 can confirm the connection relationship between the vehicle and the charging gun through the charging confirmation port CC2 of the vehicle, and transmit the charging parameter information to the charging pile controller. The charging pile controller receives the charging parameter information through CC1 and establishes a communication connection with the control unit 101. When the control unit 101 detects that the charging wake-up is effective, it feeds back a charging ready signal to the charging pile controller, controls the first battery 102 or the second battery 103 to be charged to establish a connection with the charging device, and the AC / DC power supply can charge the first battery 102 or the second battery 103 with direct current. The first preset state of charge threshold value can be 100%. When the first state of charge reaches 100%, it can be considered that the first battery 102 has completed charging. At this time, the first relay KM1 and the third relay KM3 can be disconnected to disconnect the first charging branch S1, stop charging the first battery, and disconnect the third relay KM3 to disconnect the connection between the charging identification contact CC1 and the vehicle. The charging pile controller recognizes that the charging gun has been unplugged from the vehicle at this time. After the first battery 102 is fully charged, the second charging branch S2 can be turned on by closing the second relay KM2 and the third relay KM3, and the connection between the charging identification contact CC1 and the vehicle is turned on. The charging pile controller recognizes that the charging gun has been connected to the vehicle again at this time, and the control unit 101 re-establishes a connection with the charging device to control the charging device to charge the second battery 103. In addition, it should be noted that in the case of battery aging or short circuit failure when the first battery 102 is charged, the first relay KM1 and the third relay KM3 can be immediately disconnected to disconnect the first charging branch S1.

[0039] By adopting the above scheme, when the charging identification contact of the charging gun is connected to the vehicle, the first relay and the third relay can be controlled to close, the first charging branch can be turned on, so that the charging device charges the first battery through the charging gun, and when the first battery is fully charged, the first relay and the third relay can be controlled to disconnect to simulate the action of manually pulling out the charging gun, and the second relay and the third relay can be controlled to close to turn on the second charging branch to simulate the action of manually inserting the charging gun, so that the charging device charges the second battery through the charging gun. In this way, by controlling the connection or disconnection of the relay connected to the charging gun when the charging gun is connected to the vehicle, the action of manually plugging and unplugging the charging gun during charging can be simulated, eliminating the manual switching operation when switching the charging of parallel batteries, improving the efficiency and convenience of charging, and enhancing the user experience.

[0040] In some embodiments, the control unit 101 is used to control the second relay KM2 and the third relay KM3 to close after controlling the first relay KM1 and the third relay KM3 to be opened for a preset time period.

[0041] The preset time length can be obtained based on historical data and through experimental calibration. For example, the preset time length can be 30 seconds. In this way, the user operation time and system response time between manually pulling out the charging gun and manually inserting the charging gun can be simulated by setting the preset time length, thereby improving the accuracy and safety of parallel battery charging switching.

[0042] In some embodiments, the control unit 101 is used to control the first relay KM1 and the third relay KM3 to close when the first state of charge of the first battery 102 is less than a first preset state of charge threshold.

[0043] For example, the first preset state of charge threshold can be 100%. When the first state of charge is less than 100%, the control unit 101 determines that the first battery 102 is not fully charged and needs to be charged. The first relay KM1 and the third relay KM3 can be controlled to close, so that the charging device charges the first battery 102.

[0044] In other embodiments, the control unit 101 is further used to control the second relay KM2 and the third relay KM3 to close so as to turn on the second charging branch S2, so that the charging device charges the second battery 103, when the first state of charge is equal to the first preset state of charge threshold and the second state of charge of the second battery 103 is less than the second preset state of charge threshold.

[0045] Among them, the second preset state of charge threshold can be 100%. When the first state of charge is equal to the first preset state of charge threshold, the control unit 101 determines that the first battery 102 is fully charged and does not need to be charged. When the second state of charge is less than 100%, it is determined that the second battery 103 is not fully charged and needs to be charged. The charging device can charge the second battery 103 by controlling the second relay KM2 to close and the third relay KM3 to close.

[0046] In some embodiments, the control unit 101 is used to control the second relay KM2 and the third relay KM3 to disconnect when the second state of charge of the second battery 103 reaches a second preset state of charge threshold, so as to disconnect the second charging branch S2 and disconnect the charging identification contact CC1 from the vehicle.

[0047] For example, the second preset state of charge threshold can be 100%. When the second state of charge reaches 100%, it can be considered that the second battery 103 is fully charged. At this time, the second relay KM2 and the third relay KM3 can be disconnected to disconnect the second charging branch S2, and disconnect the charging identification contact CC1 from the charging gun, so that the control unit 101 is disconnected from the charging device, and the charging process of the second battery is stopped.

[0048] It should be noted that, when the second battery 103 is charged due to battery aging or short circuit, the second relay KM2 and the third relay KM3 may be disconnected immediately to disconnect the second charging branch S2.

[0049] In some embodiments, Figure 2 As shown, the charging circuit also includes a fourth relay KM4 and a fifth relay KM5; the control unit 101 is connected to the fourth relay KM4 and the fifth relay KM5 respectively; the fourth relay KM4 is used to connect the first battery 102 and the power module of the charging device; the fifth relay KM5 is used to connect the second battery 103 and the power module of the charging device; the control unit 101 is used to control the on-off of the fourth relay KM4 according to the on-off of the first charging branch S1, so as to control the start and end of charging of the first battery 102, and control the on-off of the fifth relay KM5 according to the on-off of the second charging branch S2, so as to control the start and end of charging of the second battery 103.

[0050] The first battery 102 is connected to the power module of the charging device through the fourth relay KM4. When the fourth relay KM4 is closed, the power module charges the first battery 102 with a direct current. When the fourth relay KM4 is disconnected, the first battery 102 stops charging. The second battery 103 is connected to the power module of the charging device through the fifth relay KM5. When the fifth relay KM5 is closed, the power module charges the second battery 103 with a direct current. When the fifth relay KM5 is disconnected, the second battery 103 stops charging. In this way, the on-off control of the relay can be based on the on-off control of the charging branch to control the start and end of battery charging, which can improve the accuracy and efficiency of parallel battery charging.

[0051] In some embodiments, Figure 3 As shown, the control unit 101 includes a first charging controller 1011, which is connected to the fourth relay KM4; the first charging controller 1011 is used to control the fourth relay KM4 to close when the first charging branch S1 is turned on, and to control the fourth relay KM4 to open when the first charging branch S1 is turned off.

[0052] For example, the first charging controller 1011 can control the fourth relay KM4 to close when the first charging branch S1 is turned on, so that the power module can directly charge the first battery 102. Correspondingly, when the first charging branch S1 is turned off, the fourth relay KM4 can be controlled to be turned off to stop charging the first battery 102.

[0053] In some embodiments, Figure 4 As shown, the control unit 101 includes a second charging controller 1012, which is connected to the fifth relay KM5; the second charging controller 1012 is used to control the fifth relay KM5 to close when the second charging branch S2 is turned on, and to control the fifth relay KM5 to open when the second charging branch S2 is turned off.

[0054] For example, when the second charging branch S2 is turned on, the fifth relay KM5 can be controlled to close so that the power module can DC charge the second battery 103. Correspondingly, when the second charging branch S2 is turned off, the fifth relay KM5 can be controlled to turn off to stop charging the second battery 103.

[0055] Figure 5 is a flowchart of a charging method according to an exemplary embodiment, referring to Figure 5 , the method can be applied to a charging circuit, the charging circuit comprising: a control unit 101, a first charging branch S1, a second charging branch S2 and a third relay KM3, the first charging branch S1 comprising a first relay KM1, the control unit 101 and a first battery 102, the first relay KM1 being connected to the first battery 102 via the control unit 101, the second charging branch S2 comprising a second relay KM2, the control unit 101 and a second battery 103, the second relay KM2 being connected to the second battery 103 via the control unit 101; the third relay KM3 being connected to the control unit 101; the third relay KM3 being used to control the connection or disconnection of the charging identification contact CC1 of the charging gun in the charging device with the vehicle; the method comprising: S501: When the charging gun is connected to the vehicle through the charging identification contact, control the first relay and the third relay to close to conduct the first charging branch, so that the charging device charges the first battery.

[0056] S502: When the first state of charge of the first battery reaches a first preset state of charge threshold, control the first relay and the third relay to be disconnected to disconnect the first charging branch and disconnect the charging identification contact from the vehicle.

[0057] S503: Control the second relay and the third relay to close to conduct the second charging branch and conduct the connection between the charging identification contact and the vehicle, so that the charging device charges the second battery.

[0058] Optionally, controlling the second relay and the third relay to close to turn on the second charging branch includes: after controlling the first relay and the third relay to be disconnected for a preset time period, controlling the second relay and the third relay to close.

[0059] Optionally, controlling the first relay and the third relay to close to turn on the first charging branch includes: controlling the first relay and the third relay to close when the first state of charge of the first battery is less than a first preset state of charge threshold.

[0060] Optionally, the method also includes: when the first state of charge is equal to a first preset state of charge threshold and the second state of charge of the second battery is less than a second preset state of charge threshold, controlling the second relay and the third relay to close to turn on the second charging branch so that the charging device charges the second battery.

[0061] Optionally, the method further includes: when the second state of charge of the second battery reaches a second preset state of charge threshold, controlling the second relay and the third relay to disconnect so as to disconnect the second charging branch and disconnect the charging identification contact from the vehicle.

[0062] Optionally, the charging circuit also includes a fourth relay KM4 and a fifth relay KM5; the control unit 101 is connected to the fourth relay KM4 and the fifth relay KM5, respectively; the fourth relay KM4 is used to connect the first battery 102 and the power module of the charging device; the fifth relay KM5 is used to connect the second battery 103 and the power module of the charging device; the method also includes: controlling the on-off of the fourth relay according to the on-off of the first charging branch to control the start and end of charging of the first battery; controlling the on-off of the fifth relay according to the on-off of the second charging branch to control the start and end of charging of the second battery.

[0063] Optionally, the control unit 101 includes a first charging controller 1011, which is connected to the fourth relay KM4; controlling the on-off of the fourth relay according to the on-off of the first charging branch includes: controlling the fourth relay to close when the first charging branch is on; or controlling the fourth relay to open when the first charging branch is disconnected.

[0064] Optionally, the control unit 101 includes a second charging controller 1012, which is connected to the fifth relay KM5; controlling the on-off of the fifth relay according to the on-off of the second charging branch includes: when the second charging branch is turned on, controlling the fifth relay to close; or, when the second charging branch is turned off, controlling the fifth relay to turn off.

[0065] By adopting the above scheme, when the charging identification contact of the charging gun is connected to the vehicle, the first relay and the third relay can be controlled to close, the first charging branch can be turned on, so that the charging device charges the first battery through the charging gun, and when the first battery is fully charged, the first relay and the third relay can be controlled to disconnect to simulate the action of manually pulling out the charging gun, and the second relay and the third relay can be controlled to close to turn on the second charging branch to simulate the action of manually inserting the charging gun, so that the charging device charges the second battery through the charging gun. In this way, by controlling the connection or disconnection of the relay connected to the charging gun when the charging gun is connected to the vehicle, the action of manually plugging and unplugging the charging gun during charging can be simulated, eliminating the manual switching operation when switching the charging of parallel batteries, improving the efficiency and convenience of charging, and enhancing the user experience.

[0066] Regarding the method in the above embodiment, the specific manner of performing the operation in each step has been described in detail in the embodiment of the circuit, and will not be elaborated here.

[0067] Figure 6 is a structural block diagram of a vehicle 600 according to an exemplary embodiment. The vehicle 600 includes the charging circuit 100 described above.

[0068] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0069] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0070] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A charging circuit, characterized in that: The circuit comprises: a control unit, a first charging branch, a second charging branch and a third relay, wherein the first charging branch comprises a first relay, the control unit and a first battery, the first relay is connected to the first battery through the control unit, the second charging branch comprises a second relay, the control unit and a second battery, the second relay is connected to the second battery through the control unit; the third relay is connected to the control unit; the third relay is used to control the connection or disconnection of the charging identification contact of the charging gun in the charging device with the vehicle; The control unit is used to control the first relay and the third relay to close when the charging gun is connected to the vehicle through the charging identification contact to turn on the first charging branch so that the charging device charges the first battery, and to control the first relay and the third relay to open when the first state of charge of the first battery reaches a first preset state of charge threshold to disconnect the first charging branch and disconnect the charging identification contact from the vehicle; and to control the second relay and the third relay to close to turn on the second charging branch and connect the charging identification contact to the vehicle so that the charging device charges the second battery.

2. The circuit according to claim 1, characterized in that The control unit is used to control the second relay and the third relay to close after controlling the first relay and the third relay to be disconnected for a preset time period.

3. The circuit according to claim 1, characterized in that The control unit is used to control the first relay and the third relay to close when a first state of charge of the first battery is less than a first preset state of charge threshold.

4. The circuit according to claim 3, characterized in that The control unit is further configured to control the second relay and the third relay to close so as to turn on the second charging branch when the first state of charge is equal to a first preset state of charge threshold and the second state of charge of the second battery is less than a second preset state of charge threshold, so that the charging device charges the second battery.

5. The circuit according to claim 3 or 4, characterized in that: The control unit is used to control the second relay and the third relay to be disconnected when the second state of charge of the second battery reaches a second preset state of charge threshold, so as to disconnect the second charging branch and disconnect the charging identification contact from the vehicle.

6. The circuit according to claim 5, characterized in that The charging circuit further includes a fourth relay and a fifth relay; the control unit is connected to the fourth relay and the fifth relay respectively; The fourth relay is used to connect the first battery and the power module of the charging device; The fifth relay is used to connect the second battery and the power module of the charging device; The control unit is used to control the on-off of the fourth relay according to the on-off of the first charging branch to control the start and stop of charging of the first battery, and to control the on-off of the fifth relay according to the on-off of the second charging branch to control the start and stop of charging of the second battery.

7. The circuit according to claim 6, characterized in that The control unit includes a first charging controller, and the first charging controller is connected to the fourth relay; The first charging controller is used to control the fourth relay to close when the first charging branch is turned on, and to control the fourth relay to open when the first charging branch is turned off.

8. The circuit according to claim 6, characterized in that The control unit includes a second charging controller, and the second charging controller is connected to the fifth relay; The second charging controller is used to control the fifth relay to close when the second charging branch is turned on, and to control the fifth relay to open when the second charging branch is turned off.

9. A charging method, characterized in that: Applied to a charging circuit, the circuit comprises: a control unit, a first charging branch, a second charging branch and a third relay, the first charging branch comprises a first relay, the control unit and a first battery, the first relay is connected to the first battery through the control unit, the second charging branch comprises a second relay, the control unit and a second battery, the second relay is connected to the second battery through the control unit; the third relay is connected to the control unit; the third relay is used to control the connection or disconnection of the charging identification contact of the charging gun in the charging device with the vehicle; the method comprises: When the charging gun is connected to the vehicle through the charging identification contact, the first relay and the third relay are controlled to be closed to conduct the first charging branch so that the charging device charges the first battery; When the first state of charge of the first battery reaches a first preset state of charge threshold, controlling the first relay and the third relay to be disconnected to disconnect the first charging branch and disconnect the charging identification contact from the vehicle; The second relay and the third relay are controlled to be closed to conduct the second charging branch and to conduct the connection between the charging identification contact and the vehicle, so that the charging device charges the second battery.

10. A vehicle, characterized in that: The charging circuit comprises the charging circuit according to any one of claims 1 to 8.

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