Vehicle charging switching system and method, storage medium, and charging controller

Abstract

A vehicle charging switching method. When a first charging circuit (10) is used to perform direct current charging on a power battery (B), before switching to a second charging circuit (20) to perform boost charging on the power battery (B), a charging controller (30) can control the first charging circuit (10) to pre-charge a pre-charge unit (21) in the second charging circuit (20), and upon detecting that the voltage of the pre-charge unit (21) matches the voltage of the power battery (B), the charging controller (30) controls the second charging circuit (20) to perform boost charging on the power battery (B). Hence, when boost charging is to be performed on a power battery, it is not necessary to exit the charging process and insert the charging connector and swipe the card again, achieving seamless, uninterrupted switching from direct current charging of the power battery to boost charging of the power battery, thus improving the charging efficiency of the power battery and meeting user requirements for a single charging process. Further disclosed are a vehicle charging switching system, a computer-readable storage medium, a charging controller, and a vehicle.

Description

Vehicle charging switching system and method, storage medium, and charging controller Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a vehicle charging switching system and method, a storage medium, and a charging controller. Background Art

[0002] The vehicle may include a charging circuit and a power battery, where the charging circuit is suitable for performing DC charging and boost charging on the power battery so as to replenish the power of the power battery and supply power to other devices in the vehicle.

[0003] In the related art, after the charging circuit performs DC charging on the power battery, it is usually necessary to reinsert the gun and swipe the card, and then the charging circuit performs boost charging on the power battery again.

[0004] However, since the gun needs to be inserted and the card swiped again during the charging process, a single charge cannot meet the usage needs.

[0005] Summary of the Invention

[0006] In view of the above problems, the present application provides a vehicle charging switching system and method, a storage medium, and a charging controller. In this method, when the charging controller uses the first charging circuit to directly charge the power battery, before switching the second charging circuit to boost charge the power battery, it can control the first charging circuit to pre-charge the pre-charging unit in the second charging circuit, and when it detects that the voltage of the pre-charging unit is compatible with the voltage of the power battery, it controls the second charging circuit to boost charge the power battery. Therefore, when boost charging the power battery, there is no need to exit the charging process and insert the gun and swipe the card again, realizing seamless and uninterrupted switching from direct charging of the power battery to boost charging of the power battery, thereby improving the efficiency of charging the power battery. And this implementation method can meet the user's usage requirements for a single charging process.

[0007] In one aspect, a vehicle charging switching method is provided. The vehicle includes a power battery, a first charging circuit, and a second charging circuit. The first charging circuit is suitable for directly charging the power battery, and the second charging circuit is suitable for boost charging the power battery. The method includes:

[0008] When the first charging circuit is used to directly charge the power battery, if it is determined that the second charging circuit needs to be switched to perform boost charging on the power battery, the first charging circuit is controlled to pre-charge the pre-charging unit in the second charging circuit;

[0009] When it is detected that the voltage of the pre-charging unit matches the voltage of the power battery, the second charging circuit is controlled to perform boost charging on the power battery.

[0010] When boosting the power battery, there's no need to exit the charging process and re-insert the charger and swipe the card. This allows for seamless, uninterrupted switching from direct charging to boost charging, improving power battery charging efficiency. This approach also meets user needs for a single charging process.

[0011] Optionally, the first charging circuit includes a first switch, and the first switch is adapted to connect the charging device to the power battery. Direct charging of the power battery using the first charging circuit includes:

[0012] The first switch is controlled to be closed, and the charging device is controlled to perform constant current charging on the power battery.

[0013] Optionally, when the charging device performs constant current charging on the power battery, the method further includes:

[0014] If the voltage of the power battery reaches the first target charging voltage, the charging device is controlled to perform constant voltage charging on the power battery.

[0015] Optionally, determining that the second charging circuit needs to be switched to perform boost charging on the power battery includes:

[0016] When the charging device charges the power battery at a constant voltage, obtaining the output current of the charging device;

[0017] When the output current of the charging device is less than or equal to the first preset current threshold, it is determined that the second charging circuit needs to be switched to perform boost charging on the power battery.

[0018] Optionally, the pre-charge unit includes a pre-charge capacitor and a pre-charge switch, one end of the pre-charge capacitor is connected to the negative terminal, the other end of the pre-charge capacitor is connected to one end of the pre-charge switch, and the other end of the pre-charge switch is suitable for being connected to the first charging circuit, wherein controlling the first charging circuit to pre-charge the pre-charge unit in the second charging circuit includes:

[0019] The pre-charge switch is controlled to be closed so that the first charging circuit charges the pre-charge capacitor.

[0020] Optionally, the second charging circuit further includes a second switch and a boost device, the second switch being adapted to connect the charging device to the pre-charge capacitor, and the boost device being connected between the pre-charge switch and the power battery, wherein controlling the second charging circuit to boost charge the power battery includes:

[0021] The pre-charging switch is controlled to remain closed, and the second switch is controlled to be closed. When the charging connection between the first charging circuit and the power battery is disconnected, the boost device is controlled to boost the DC power output by the charging device to charge the power battery.

[0022] Optionally, controlling the pre-charge switch to remain closed and controlling the second switch to close includes:

[0023] When the pre-charge switch is controlled to remain closed, the second switch is controlled to be closed;

[0024] After controlling the second switch to be closed, controlling the first charging circuit to disconnect the charging connection with the power battery.

[0025] Optionally, the boost device is composed of an inverter bridge and motor windings in the vehicle.

[0026] Optionally, the inverter bridge includes a three-phase bridge arm, the DC end of the three-phase bridge arm is connected to the power battery, the AC end of the three-phase bridge arm is connected to the motor winding, and has three nodes, and the other end of the pre-charge switch is suitable for connecting to any one of the three nodes.

[0027] On the other hand, a computer-readable storage medium is provided, on which a vehicle charging switching program is stored. When the vehicle charging switching program is executed by a processor, the vehicle charging switching method described in the above aspects is implemented.

[0028] On the other hand, a charging controller is provided, comprising: a memory, a processor, and a vehicle charging switching program stored in the memory and executable on the processor. When the processor executes the vehicle charging switching program, the vehicle charging switching method described in the above aspects is implemented.

[0029] In another aspect, a vehicle charging switching system is provided, comprising:

[0030] a first charging circuit and a second charging circuit, the first charging circuit being adapted to directly charge a power battery in a vehicle, and the second charging circuit being adapted to boost charging the power battery;

[0031] The charging controller is configured to control the first charging circuit to pre-charge the pre-charging unit in the second charging circuit before switching to the second charging circuit to boost charge the power battery when the first charging circuit is used to directly charge the power battery, and to control the second charging circuit to boost charge the power battery when it is detected that the voltage of the pre-charging unit is compatible with the voltage of the power battery.

[0032] On the other hand, a vehicle includes a power battery and the vehicle charging switching system described in the above aspects.

[0033] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0035] FIG2 is a schematic structural diagram of another vehicle provided in an embodiment of the present application;

[0036] FIG3 is a schematic structural diagram of another vehicle provided in an embodiment of the present application;

[0037] FIG4 is a timing diagram of controlling the first switch, the second switch, and the pre-charge switch provided in an embodiment of the present application;

[0038] FIG5 is a schematic structural diagram of another vehicle provided in an embodiment of the present application;

[0039] FIG6 is a schematic structural diagram of another vehicle provided in an embodiment of the present application;

[0040] FIG7 is a schematic structural diagram of another vehicle provided in an embodiment of the present application;

[0041] FIG8 is a flow chart of a vehicle charging switching method provided in an embodiment of the present application;

[0042] FIG9 is a flowchart of another vehicle charging switching method provided in an embodiment of the present application;

[0043] FIG10 is a schematic structural diagram of a charging controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0046] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0047] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0049] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0050] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0051] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0052] The vehicle may include a charging circuit and a power battery. The charging circuit is used to perform DC charging and boost charging on the power battery so that the power battery is replenished and can supply power to other devices in the vehicle.

[0053] In the related art, after the charging circuit performs DC charging on the power battery, it is necessary to reinsert the gun and swipe the card, and then the charging circuit performs boost charging on the power battery again.

[0054] However, after the charging circuit has completed DC charging of the power battery, the gun needs to be re-inserted and the card swiped before the charging circuit can boost the power battery, resulting in low charging efficiency. Moreover, for a single charge, the gun needs to be re-inserted and the card swiped during the charging process, which cannot meet the user's needs.

[0055] An embodiment of the present application provides a vehicle charging switching system, wherein a first charging circuit in the vehicle charging switching system is adapted to directly charge a power battery, and a second charging circuit is adapted to boost charge the power battery. A charging controller is configured to, when the first charging circuit is used to directly charge the power battery, control the first charging circuit to pre-charge a pre-charging unit in the second charging circuit before switching to boost charge the power battery, and, upon detecting that the voltage of the pre-charging unit matches the voltage of the power battery, control the second charging circuit to boost charge the power battery.

[0056] Since the power battery can be boosted and charged by controlling the second charging circuit, there is no need to insert the gun and swipe the card again, thereby improving the efficiency of charging the power battery and meeting the user's needs for a single charging process.

[0057] An embodiment of the present application provides a vehicle, as shown in FIG1 , the vehicle includes a vehicle charging switching system 100 and a power battery B. The vehicle charging switching system 100 includes: a first charging circuit 10 , a second charging circuit 20 and a charging controller 30 .

[0058] The first charging circuit 10 and the second charging circuit 20 are both connected to the power battery B. The first charging circuit 10 is suitable for directly charging the power battery B, and the second charging circuit 20 is suitable for boosting and charging the power battery B.

[0059] The charging controller 30 is connected to the first charging circuit 10 and the second charging circuit 20 respectively. The charging controller 30 is configured to control the first charging circuit 10 to pre-charge the pre-charging unit 21 in the second charging circuit 20 before switching the second charging circuit 20 to boost charge the power battery B when the first charging circuit 10 is used to directly charge the power battery B, and to control the second charging circuit 20 to boost charge the power battery B when it is detected that the voltage of the pre-charging unit 21 is compatible with the voltage of the power battery B.

[0060] Among them, the adaptation of the voltage of the pre-charging unit 21 to the voltage of the power battery B can mean that the voltage of the pre-charging unit 21 is equal to the voltage of the power battery B, or the absolute value of the difference between the voltage of the pre-charging unit 21 and the voltage of the power battery B is less than the voltage threshold, and the voltage threshold is greater than 0. At this time, the voltage of the pre-charging unit 21 is close to the voltage of the power battery B.

[0061] In summary, an embodiment of the present application provides a vehicle charging switching system, in which the charging controller, when using a first charging circuit to directly charge the power battery, can control the first charging circuit to pre-charge the pre-charging unit in the second charging circuit before switching the second charging circuit to boost charging the power battery, and when it is detected that the voltage of the pre-charging unit is compatible with the voltage of the power battery, control the second charging circuit to boost charging the power battery.

[0062] This eliminates the need to exit the charging process and re-insert the charger and swipe the card during boost charging, achieving seamless, uninterrupted switching from direct charging to boost charging, improving battery charging efficiency. This approach also meets user needs for a single charging process.

[0063] 1 and 2 , the first charging circuit 10 may include a first switch K1 , and the first switch K1 is adapted to connect the charging device 200 to the power battery B. The charging device 200 may be a direct current (DC) charging station.

[0064] 2 , one end of the first switch K1 is connected to the charging device 200 , and the other end of the first switch K1 is connected to the positive terminal (+) of the power battery B.

[0065] 3 and 4 , at time T0 , the charging controller 30 is configured to control the first switch K1 to be closed, and to control the charging device 200 to charge the power battery B with a constant current.

[0066] While controlling the first switch K1 to close, the charging controller 30 can send a constant current charging request to the charging device 200, and the charging device 200 can respond to the constant current charging request and perform constant current charging on the power battery B, thereby realizing constant current direct charging of the power battery B using the first charging circuit 10.

[0067] Assuming the rated voltage of the charging device 200 is 750 volts (V), at time T0, the charging controller 30 controls the first switch K1 to close. The output voltage of the charging device 200 and the voltage Ub1 of the power battery B are both 750 V. The voltage at the first node a, which is connected between the power battery B and the second charging circuit 20, is equal to the voltage Ub1 of the power battery B. The output current of the charging device 200 and the current of the busbar connected to the power battery B are both 99 amperes (A).

[0068] After the voltage Ub1 of power battery B reaches 750V, the output current of charging device 200 will continue to decrease. Between time T0 and time T1, the voltage Ub1 of power battery B is less than 750V, the output voltage of charging device 200 is close to the voltage Ub1 of power battery B, and the voltage of first node a is equal to the voltage Ub1 of power battery B. After detecting that the output current is less than or equal to the switching threshold, the charging controller 30 can send a current reduction request to charging device 200. In response to this current reduction request, charging device 200 can reduce the output current to a first reference current less than or equal to 1A. At this time, the bus current is close to 0A. For example, the switching threshold can be 100A.

[0069] When the charging device 200 performs constant-current charging on the power battery B, the charging controller 30 can detect whether the voltage of the power battery B has reached a first target charging voltage. If the voltage of the power battery B has not reached the first target charging voltage, the charging device 200 can continue to perform constant-current charging on the power battery B. If the voltage of the power battery B has reached the first target charging voltage, the charging device 200 can be controlled to perform constant-voltage charging on the power battery B. The first target charging voltage is pre-stored in the charging controller 30.

[0070] If the voltage of the power battery B reaches the first target charging voltage, the charging controller 30 may send a constant voltage charging request to the charging device 200 , and the charging device 200 may perform constant voltage charging on the power battery B in response to the constant voltage charging request.

[0071] The charging device 200 begins constant-voltage charging of power battery B at time T1. At time T1, the voltage Ub1 of power battery B is less than 750 V, the output voltage of the charging device 200 is close to the voltage Ub1 of power battery B, and the voltage at the first node a is equal to the voltage Ub1 of power battery B. The output current of the charging device and the bus current are close to 0 A.

[0072] When the charging device 200 performs constant voltage charging on the power battery B, the charging controller 30 may obtain the output current of the charging device 200. When the output current of the charging device 200 is less than or equal to a first preset current threshold, the charging controller 30 determines that it is necessary to switch to the second charging circuit 20 to perform boost charging on the power battery B. The first preset current threshold is pre-stored in the charging device 200.

[0073] It is understandable that during the process of constant-voltage charging of the power battery B by the charging device 200, the output current of the charging device 200 continues to decrease. When the charging controller 30 determines that the output current of the charging device 200 is less than or equal to the first preset current threshold, it can be determined that the charging power of the charging device 200 is small, and therefore it is determined that the second charging circuit 20 needs to be switched to perform boost charging on the power battery B.

[0074] Referring to Figure 2, the pre-charge unit 21 may include a pre-charge capacitor C1 and a pre-charge switch S, one end of the pre-charge capacitor C1 is connected to the negative terminal (-), the other end of the pre-charge capacitor C1 is connected to one end of the pre-charge switch S, and the other end of the pre-charge switch S is suitable for connecting to the first charging circuit 10.

[0075] 5 , if the charging controller 30 determines that it is necessary to switch the second charging circuit 20 to boost charge the power battery B, it can control the pre-charge switch S to close so that the first charging circuit 10 charges the pre-charge capacitor C1, thereby controlling the first charging circuit 10 to pre-charge the pre-charge unit 21.

[0076] 2 and 4 , the charging controller 30 controls the pre-charge switch S to be closed between time T1 and time T2. At time T2, the voltage Ub1 of the power battery B is less than 750 V, the output voltage of the charging device 200, the voltage of the pre-charge capacitor C1, and the voltage of the first node a are all equal to the voltage Ub1 of the power battery B, and the output current of the charging device 200 and the current of the bus are both close to 0 A.

[0077] 2 , the second charging circuit 20 may further include a second switch K2 and a boost device 22 . The second switch K2 is adapted to connect the charging device 200 to the pre-charge capacitor C1 . The boost device 22 is connected between the pre-charge switch S and the power battery B.

[0078] Referring to Figure 6, after controlling the pre-charge switch S to close, the charging controller 30 can control the pre-charge switch S to remain closed and control the second switch K2 to close when it detects that the voltage of the pre-charge capacitor C1 is compatible with the voltage of the power battery B. In addition, when controlling the first charging circuit 10 (the first charging circuit 10 includes the first switch K1) to disconnect the charging connection with the power battery B, the charging controller 30 can control the boost device 22 to boost the DC power output by the charging device 200 to charge the power battery B, thereby controlling the second charging circuit 20 to boost and charge the power battery B.

[0079] The charging controller 30 may control the second switch K2 to be closed while controlling the pre-charging switch S to remain closed, and after controlling the second switch K2 to be closed, control the first charging circuit 10 to disconnect the charging connection with the power battery B.

[0080] 7 , the charging controller 30 can control the first switch K1 to be disconnected when detecting that the output current is less than the second reference current, thereby disconnecting the charging connection between the first charging circuit 10 and the power battery B. The second reference current can be 5A.

[0081] 4 , the charging controller 30 controls the second switch K2 to be closed between time T2 and time T3 , and controls the first switch K1 to be opened between time T3 and time T4 .

[0082] Between time T2 and time T3, the voltage Ub1 of the power battery B is less than 750V, the output voltage of the charging device 200, the voltage of the first node a, and the voltage of the pre-charge capacitor C1 are all equal to the voltage Ub1 of the power battery B, and the output current of the charging device 200 and the current of the bus are both close to 0A.

[0083] After the first switch K1 is controlled to be disconnected, at time T4, the voltage Ub1 of the power battery B is greater than 750 V, the output voltage of the charging device 200, the voltage of the pre-charge capacitor C1, and the voltage of the second node b are all equal to 740 V, the voltage of the first node a is equal to the voltage Ub1 of the power battery, and the output current of the charging device 200 and the current of the bus are both greater than 100 A.

[0084] 2 , the boost device 22 may be composed of an inverter bridge 22 a and a motor winding M in the vehicle. The inverter bridge 22 a may include a three-phase bridge arm, wherein the DC end of the three-phase bridge arm is connected to the power battery B, and the AC end of the three-phase bridge arm is connected to the motor winding M. The three-phase bridge arm has three nodes, and the other end of the pre-charge switch S is suitable for connecting to any one of the three nodes.

[0085] Referring to Figure 2 , the three nodes may include node c1, node c2, and node c3. The first leg of the three-phase bridge includes a first switch S1 and a fourth switch S4 connected in series. The second leg includes a second switch S2 and a fifth switch S5 connected in series. The third leg includes a third switch S3 and a sixth switch S6 connected in series. Node 1 is located in the first leg, node 2 is located in the second leg, and node 3 is located in the third leg. The other end of the precharge switch S is adapted to be connected to node c1.

[0086] 2 , the boost device 22 may further include a first capacitor C2 , which is connected in parallel to the inverter bridge 22 a .

[0087] In summary, an embodiment of the present application provides a vehicle charging switching system, in which the charging controller, when using a first charging circuit to directly charge the power battery, can control the first charging circuit to pre-charge the pre-charging unit in the second charging circuit before switching the second charging circuit to boost charging the power battery, and when it is detected that the voltage of the pre-charging unit is compatible with the voltage of the power battery, control the second charging circuit to boost charging the power battery.

[0088] This eliminates the need to exit the charging process and re-insert the charger and swipe the card during boost charging, achieving seamless, uninterrupted switching from direct charging to boost charging, improving battery charging efficiency. This approach also meets user needs for a single charging process.

[0089] When the rated voltage of the power battery is greater than the rated voltage of the charging equipment, the vehicle charging switching system is used to automatically switch from direct charging of the power battery to boost charging of the power battery, thereby realizing fast charging and high-power charging, and then completing full charging.

[0090] FIG8 is a flow chart of a vehicle charging switching method provided in an embodiment of the present application, which is applied to the charging controller 30 shown in FIG1 . As shown in FIG8 , the method includes:

[0091] Step 801: When a first charging circuit is used to directly charge a power battery, if it is determined that a second charging circuit needs to be switched to perform boost charging on the power battery, the first charging circuit is controlled to pre-charge a pre-charging unit in the second charging circuit.

[0092] Step 802: When it is detected that the voltage of the pre-charging unit matches the voltage of the power battery, control the second charging circuit to perform boost charging on the power battery.

[0093] In summary, an embodiment of the present application provides a vehicle charging switching method, in which the charging controller, when using a first charging circuit to directly charge the power battery, if determines that it is necessary to switch to a second charging circuit to boost charge the power battery, can control the first charging circuit to pre-charge the pre-charging unit in the second charging circuit, and when it is detected that the voltage of the pre-charging unit is compatible with the voltage of the power battery, control the second charging circuit to boost charge the power battery.

[0094] This eliminates the need to exit the charging process and re-insert the charger and swipe the card during boost charging, achieving seamless, uninterrupted switching from direct charging to boost charging, improving battery charging efficiency. This approach also meets user needs for a single charging process.

[0095] FIG9 is a flow chart of another vehicle charging switching method provided in an embodiment of the present application, which is applied to the charging controller 30 shown in FIG1 . As shown in FIG9 , the method may include:

[0096] Step 901: Control the first switch to be closed, and control the charging device to perform constant current charging on the power battery.

[0097] Step 902: If the voltage of the power battery reaches the first target charging voltage, control the charging device to perform constant voltage charging on the power battery.

[0098] Step 903: When the charging device performs constant voltage charging on the power battery, obtain the output current of the charging device.

[0099] Step 904: When the output current of the charging device is less than or equal to the first preset current threshold, it is determined that the second charging circuit needs to be switched to perform boost charging on the power battery.

[0100] Step 905: Control the pre-charge switch to be closed so that the first charging circuit charges the pre-charge capacitor.

[0101] Step 906: When it is detected that the voltage of the pre-charging unit matches the voltage of the power battery, the pre-charging switch is controlled to remain closed, and the second switch is controlled to be closed. When the charging connection between the first charging circuit and the power battery is controlled to be disconnected, the boost device is controlled to boost the DC power output by the charging device to charge the power battery.

[0102] It should be noted that the specific implementation process of steps 801 to 802, and steps 901 to 906 can refer to the above-mentioned system embodiment, and the embodiment of this application will not be repeated here.

[0103] In summary, an embodiment of the present application provides a vehicle charging switching method, in which the charging controller, when using a first charging circuit to directly charge the power battery, if determines that it is necessary to switch to a second charging circuit to boost charge the power battery, can control the first charging circuit to pre-charge the pre-charging unit in the second charging circuit, and when it is detected that the voltage of the pre-charging unit is compatible with the voltage of the power battery, control the second charging circuit to boost charge the power battery.

[0104] This eliminates the need to exit the charging process and re-insert the charger and swipe the card during boost charging, achieving seamless, uninterrupted switching from direct charging to boost charging, improving battery charging efficiency. This approach also meets user needs for a single charging process.

[0105] The present invention provides a computer-readable storage medium storing a vehicle charging switching program, which, when executed by a processor, implements the vehicle charging switching method described in the above embodiments, for example, the vehicle charging switching method shown in FIG8 or FIG9 .

[0106] FIG10 is a schematic diagram of the structure of a charging controller provided in an embodiment of the present application, comprising: a memory 1001, a processor 1002, and a vehicle charging switching program stored in the memory 1001 and executable on the processor 1002. When the processor 1002 executes the vehicle charging switching program, the vehicle charging switching method described in the above embodiment is implemented, for example, the vehicle charging switching method shown in FIG8 or FIG9.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A vehicle charging switching method, the vehicle comprising a power battery, a first charging circuit and a second charging circuit, the first charging circuit being suitable for direct charging of the power battery, and the second charging circuit being suitable for boost charging of the power battery, the method comprising: In the case where the first charging circuit is used to directly charge the power battery, if it is determined that the second charging circuit needs to be switched to perform boost charging on the power battery, the first charging circuit is controlled to pre-charge the pre-charging unit in the second charging circuit; When it is detected that the voltage of the pre-charging unit matches the voltage of the power battery, the second charging circuit is controlled to perform boost charging on the power battery.

2. The vehicle charging switching method according to claim 1, wherein the first charging circuit comprises a first switch, and the first switch is suitable for connecting a charging device to the power battery, wherein: Directly charging the power battery using the first charging circuit includes: The first switch is controlled to be closed, and the charging device is controlled to perform constant current charging on the power battery.

3. The vehicle charging switching method according to claim 2, wherein when the charging device performs constant current charging on the power battery, the method further comprises: If the voltage of the power battery reaches the first target charging voltage, the charging device is controlled to perform constant voltage charging on the power battery.

4. The vehicle charging switching method according to claim 3, determining that the second charging circuit needs to be switched to boost charge the power battery, comprising: When the charging device performs constant voltage charging on the power battery, obtaining an output current of the charging device; When the output current of the charging device is less than or equal to the first preset current threshold, it is determined that the second charging circuit needs to be switched to perform boost charging on the power battery.

5. The vehicle charging switching method according to any one of claims 1 to 4, wherein the pre-charging unit comprises a pre-charging capacitor and a pre-charging switch, one end of the pre-charging capacitor is connected to the negative terminal, the other end of the pre-charging capacitor is connected to one end of the pre-charging switch, and the other end of the pre-charging switch is suitable for connecting to the first charging circuit, wherein: Controlling the first charging circuit to pre-charge a pre-charging unit in the second charging circuit includes: The pre-charge switch is controlled to be closed so that the first charging circuit charges the pre-charge capacitor.

6. The vehicle charging switching method according to claim 5, wherein the second charging circuit further comprises a second switch and a boost device, wherein the second switch is adapted to connect the charging device to the pre-charge capacitor, and the boost device is connected between the pre-charge switch and the power battery, wherein: Controlling the second charging circuit to boost charging the power battery includes: The pre-charging switch is controlled to remain closed, and the second switch is controlled to be closed, and while the charging connection between the first charging circuit and the power battery is disconnected, the boost device is controlled to perform a boost conversion on the DC power output by the charging device to charge the power battery.

7. The vehicle charging switching method according to claim 6, controlling the pre-charging switch to remain closed, and controlling the second switch to close, comprising: When the pre-charging switch is controlled to remain closed, the second switch is controlled to be closed; After controlling the second switch to be closed, controlling the first charging circuit to disconnect the charging connection with the power battery.

8. The vehicle charging switching method according to claim 6 or 7, wherein the boost device is composed of an inverter bridge and a motor winding in the vehicle.

9. According to the vehicle charging switching method of claim 8, the inverter bridge includes a three-phase bridge arm, the DC end of the three-phase bridge arm is connected to the power battery, the AC end of the three-phase bridge arm is connected to the motor winding, and has three nodes, and the other end of the pre-charging switch is suitable for connecting to any one of the three nodes.

10. A computer-readable storage medium having a vehicle charging switching program stored thereon, wherein the vehicle charging switching program, when executed by a processor, implements the vehicle charging switching method according to any one of claims 1 to 9.

11. A charging controller comprising: A memory, a processor, and a vehicle charging switching program stored in the memory and executable on the processor, wherein when the processor executes the vehicle charging switching program, the vehicle charging switching method according to any one of claims 1 to 9 is implemented.

12. A vehicle charging switching system, comprising: a first charging circuit and a second charging circuit, wherein the first charging circuit is suitable for directly charging a power battery in a vehicle, and the second charging circuit is suitable for boosting and charging the power battery; The charging controller is configured to control the first charging circuit to pre-charge the pre-charging unit in the second charging circuit before switching the second charging circuit to boost charging the power battery when the first charging circuit is used to directly charge the power battery, and to control the second charging circuit to boost charging the power battery when it is detected that the voltage of the pre-charging unit matches the voltage of the power battery.

13. A vehicle comprising a power battery and the vehicle charging switching system according to claim 12.

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