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

Abstract

The invention discloses a vehicle charging switching system and method, a storage medium and a charging controller. In the method, under the condition that the charging controller adopts a first charging circuit to directly charge a power battery, the charging controller can directly charge the power battery before a second charging circuit is switched to boost and charge the power battery; and controlling the first charging circuit to pre-charge a pre-charging unit in the second charging circuit, and controlling the second charging circuit to boost and charge the power battery under the condition that the voltage of the pre-charging unit is detected to be matched with the voltage of the power battery. Therefore, when the power battery is subjected to boost charging, the charging process does not need to be quitted and the gun is not required to be inserted and the card is not required to be swiped again, seamless and uninterrupted switching from direct charging of the power battery to boost charging of the power battery is realized, and the charging efficiency of the power battery is improved. And the implementation mode can meet the use requirement of a single charging process of a user.

Description

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, wherein 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 needs to be swiped again during the charging process, a single charge cannot meet the usage needs. Summary of the invention

[0005] 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, the charging controller 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 when the first charging circuit is used to directly charge the power battery, and control the second charging circuit to boost charge the power battery when it is detected that the voltage of the pre-charging unit matches the voltage of 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, which realizes 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 use requirements for a single charging process.

[0006] On the one hand, 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:

[0007] 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;

[0008] 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.

[0009] When boosting the power battery, there is no need to exit the charging process and insert the gun and swipe the card again, which realizes seamless and uninterrupted switching from direct charging to boost charging, thus improving the efficiency of charging the power battery. And this implementation method can meet the user's needs for a single charging process.

[0010] Optionally, the first charging circuit includes a first switch, and the first switch is suitable for connecting the charging device to the power battery, wherein the first charging circuit is used to directly charge the power battery, including:

[0011] The first switch is controlled to close, and the charging device is controlled to perform constant current charging on the power battery.

[0012] Optionally, when the charging device performs constant current charging on the power battery, the method further includes:

[0013] 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.

[0014] Optionally, determining that the second charging circuit needs to be switched to boost charge the power battery includes:

[0015] When the charging device charges the power battery at a constant voltage, obtaining the output current of the charging device;

[0016] 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.

[0017] 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 connecting to the first charging circuit, wherein controlling the first charging circuit to pre-charge the pre-charge unit in the second charging circuit includes:

[0018] The pre-charge switch is controlled to be closed so that the first charging circuit charges the pre-charge capacitor.

[0019] Optionally, the second charging circuit further includes a second switch and a boost device, the second switch is suitable for connecting 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 charge the power battery includes:

[0020] The pre-charging switch is controlled to remain closed, and the second switch is controlled to be closed, and when 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.

[0021] Optionally, controlling the pre-charge switch to remain closed, and controlling the second switch to close, comprises:

[0022] When the pre-charging switch is controlled to remain closed, the second switch is controlled to be closed;

[0023] After controlling the second switch to be closed, controlling the first charging circuit to disconnect the charging connection with the power battery.

[0024] Optionally, the boost device is composed of an inverter bridge and motor windings in the vehicle.

[0025] 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.

[0026] 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 aspect is implemented.

[0027] 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, wherein when the processor executes the vehicle charging switching program, the vehicle charging switching method described in the above aspects is implemented.

[0028] In another aspect, a vehicle charging switching system is provided, comprising:

[0029] a first charging circuit and a second charging circuit, the first charging circuit being suitable for directly charging a power battery in a vehicle, and the second charging circuit being suitable for boost charging the power battery;

[0030] 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.

[0031] On the other hand, a vehicle includes a power battery and the vehicle charging switching system described in the above aspects.

[0032] 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

[0033] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of the present application;

[0034] Figure 2 is a structural schematic diagram of another vehicle provided in an embodiment of the present application;

[0035] Figure 3 is a structural schematic diagram of another vehicle provided in an embodiment of the present application;

[0036] Figure 4 is a timing diagram for controlling the first switch, the second switch and the pre-charge switch provided in an embodiment of the present application;

[0037] Figure 5 is a structural schematic diagram of another vehicle provided in an embodiment of the present application;

[0038] Figure 6 is a structural schematic diagram of another vehicle provided in an embodiment of the present application;

[0039] Figure 7 is a structural schematic diagram of another vehicle provided in an embodiment of the present application;

[0040] Figure 8 is a flow chart of a vehicle charging switching method provided in an embodiment of the present application;

[0041] Fig. 9 is a flow chart of another vehicle charging switching method provided in an embodiment of the present application;

[0042] Fig.10 It is a structural schematic diagram of a charging controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0045] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0046] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0047] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0048] 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).

[0049] 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] The vehicle may include a charging circuit and a power battery, wherein 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.

[0052] 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.

[0053] However, after the charging circuit performs DC charging on the power battery, the gun needs to be re-inserted and the card needs to be swiped before the charging circuit can boost the power battery, resulting in low efficiency in charging the power battery. In addition, for a single charge, the gun needs to be re-inserted and the card needs to be swiped during the charging process, which cannot meet the usage requirements.

[0054] The embodiment of the present application provides a vehicle charging switching system, in which the first charging circuit in the vehicle charging switching system is suitable for direct charging of a power battery, and the second charging circuit is suitable for boost charging of the power battery. The charging controller is configured to control the first charging circuit to pre-charge a 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.

[0055] 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.

[0056] The present application embodiment provides a vehicle, such as Figure 1 As shown, 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.

[0057] 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 the power battery B.

[0058] 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 matches the voltage of the power battery B.

[0059] Among them, the adaptation of the voltage of the pre-charging unit 21 to the voltage of the power battery B may 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.

[0060] To summarize, an embodiment of the present application provides a vehicle charging switching system, in which the charging controller, when using the 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 matches the voltage of the power battery, control the second charging circuit to boost charging the power battery.

[0061] Therefore, when boosting the power battery, there is no need to exit the charging process and insert the gun and swipe the card again, which realizes seamless and uninterrupted switching from direct charging to boosting charging, thus improving the efficiency of charging the power battery. And this implementation method can meet the user's needs for a single charging process.

[0062] refer to Figure 1 and Figure 2 The first charging circuit 10 may include a first switch K1, and the first switch K1 is suitable for connecting the charging device 200 to the power battery B. The charging device 200 may be a direct current (DC) charging pile.

[0063] refer to Figure 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.

[0064] refer to Figure 3 and Figure 4 At time T0, the charging controller 30 is used to control the first switch K1 to close, and control the charging device 200 to charge the power battery B with a constant current.

[0065] 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 to perform constant current charging on the power battery B, thereby achieving constant current direct charging of the power battery B using the first charging circuit 10.

[0066] Assuming that 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 of the first node a is equal to the voltage Ub1 of the power battery B, and the first node a is connected between the power battery B and the second charging circuit 20. The output current of the charging device 200 and the current of the bus are both 99 amperes (A), and the bus is the bus connected to the power battery B.

[0067] After the voltage Ub1 of the power battery B reaches 750V, the output current of the charging device 200 will continue to decrease. Between time T0 and time T1, the voltage Ub1 of the power battery B is less than 750V, the output voltage of the charging device 200 is close to the voltage Ub1 of the power battery B, and the voltage of the first node a is equal to the voltage Ub1 of the 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 the charging device 200, and the charging device 200 can respond to the current reduction request and make the output current less than or equal to the first reference current, which is close to 1A. At this time, the current of the bus is close to 0A. For example, the switching threshold can be 100A.

[0068] 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 reaches the first target charging voltage. If the voltage of the power battery B does not reach the first target charging voltage, the charging device 200 can continue to be controlled to perform constant current charging on the power battery B. If the voltage of the power battery B reaches 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.

[0069] 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.

[0070] The moment when the charging device 200 starts constant voltage charging of the power battery B is T1. At T1, the voltage Ub1 of the power battery B is less than 750V, the output voltage of the charging device 200 is close to the voltage Ub1 of the power battery B, and the voltage of the first node a is equal to the voltage Ub1 of the power battery B. The output current of the charging device and the bus current are close to 0A.

[0071] When the charging device 200 performs constant voltage charging on the power battery B, the charging controller 30 can obtain the output current of the charging device 200, and when the output current of the charging device 200 is less than or equal to the first preset current threshold, it is determined that the second charging circuit 20 needs to be switched to perform boost charging on the power battery B. The first preset current threshold is pre-stored in the charging device 200.

[0072] 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 determines that it is necessary to switch the second charging circuit 20 to boost charging of the power battery B.

[0073] refer 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.

[0074] refer to Figure 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-charging switch S to close so that the first charging circuit 10 charges the pre-charging capacitor C1, thereby controlling the first charging circuit 10 to pre-charge the pre-charging unit 21.

[0075] refer to Figure 2 and Figure 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 750V. 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. The output current of the charging device 200 and the current of the bus are both close to 0A.

[0076] refer to Figure 2The second charging circuit 20 may further include a second switch K2 and a boost device 22, wherein the second switch K2 is adapted to connect the charging device 200 to the pre-charging capacitor C1, and the boost device 22 is connected between the pre-charging switch S and the power battery B.

[0077] refer to Figure 6 After controlling the pre-charging switch S to close, the charging controller 30 can control the pre-charging switch S to remain closed and control the second switch K2 to close when detecting that the voltage of the pre-charging capacitor C1 matches the voltage of the power battery B. 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.

[0078] The charging controller 30 may control the second switch K2 to close while controlling the pre-charging switch S to remain closed, and after controlling the second switch K2 to close, control the first charging circuit 10 to disconnect the charging connection with the power battery B.

[0079] refer to Figure 7 , the charging controller 30 can control the first switch K1 to disconnect when detecting that the output current is less than the second reference current, thereby controlling the first charging circuit 10 to disconnect the charging connection with the power battery B. The second reference current can be 5A.

[0080] refer to Figure 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.

[0081] 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.

[0082] After controlling the first switch K1 to disconnect, at time T4, the voltage Ub1 of the power battery B is greater than 750V, 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 740V, 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 100A.

[0083] refer to Figure 2The boost device 22 may be composed of an inverter bridge 22a and a motor winding M in the vehicle. The inverter bridge 22a may include a three-phase bridge arm, a DC end of the three-phase bridge arm is connected to the power battery B, an AC end of the three-phase bridge arm is connected to the motor winding M, and has three nodes, and the other end of the pre-charge switch S is suitable for connecting to any one of the three nodes.

[0084] refer to Figure 2 , the three nodes may include node c1, node c2 and node c3, the first bridge arm in the three-phase bridge arm includes the first switch tube S1 and the fourth switch tube S4 connected in series, the second bridge arm includes the second switch tube S2 and the fifth switch tube S5 connected in series, and the third bridge arm includes the third switch tube S3 and the sixth switch tube S6 connected in series. Node 1 is located on the first bridge arm, node 2 is located on the second bridge arm, node 3 is located on the third bridge arm, and the other end of the pre-charge switch S is suitable for connecting to node c1.

[0085] refer to Figure 2 The boost device 22 may further include a first capacitor C2, and the first capacitor C2 is connected in parallel with the inverter bridge 22a.

[0086] To summarize, an embodiment of the present application provides a vehicle charging switching system, in which the charging controller, when using the 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 matches the voltage of the power battery, control the second charging circuit to boost charging the power battery.

[0087] Therefore, when boosting the power battery, there is no need to exit the charging process and insert the gun and swipe the card again, which realizes seamless and uninterrupted switching from direct charging to boost charging, thus improving the efficiency of charging the power battery. And this implementation method can meet the user's needs for a single charging process.

[0088] 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.

[0089] Figure 8 This is a flow chart of a vehicle charging switching method provided by an embodiment of the present application, which is applied to Figure 1 The charging controller 30 shown in FIG. Figure 8 As shown, the method includes:

[0090] 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.

[0091] 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.

[0092] To summarize, an embodiment of the present application provides a vehicle charging switching method, in which, when the charging controller uses the first charging circuit to directly charge the power battery, if it is determined that the second charging circuit needs to be switched to boost charge the power battery, the first charging circuit can be controlled 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 matches the voltage of the power battery, the second charging circuit can be controlled to boost charge the power battery.

[0093] Therefore, when boosting the power battery, there is no need to exit the charging process and insert the gun and swipe the card again, which realizes seamless and uninterrupted switching from direct charging to boosting charging, thus improving the efficiency of charging the power battery. And this implementation method can meet the user's needs for a single charging process.

[0094] Fig. 9 is a flow chart of another vehicle charging switching method provided in an embodiment of the present application, which is applied to Figure 1 The charging controller 30 shown in FIG. Fig. 9 As shown, the method may include:

[0095] Step 901: Control the first switch to close, and control the charging device to perform constant current charging on the power battery.

[0096] 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.

[0097] Step 903: When the charging device performs constant voltage charging on the power battery, the output current of the charging device is obtained.

[0098] 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.

[0099] Step 905: Control the pre-charge switch to close so that the first charging circuit charges the pre-charge capacitor.

[0100] 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 close. 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.

[0101] 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 the present application will not be repeated here.

[0102] To summarize, an embodiment of the present application provides a vehicle charging switching method, in which, when the charging controller uses the first charging circuit to directly charge the power battery, if it is determined that the second charging circuit needs to be switched to boost charge the power battery, the first charging circuit can be controlled 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 matches the voltage of the power battery, the second charging circuit can be controlled to boost charge the power battery.

[0103] Therefore, when boosting the power battery, there is no need to exit the charging process and insert the gun and swipe the card again, which realizes seamless and uninterrupted switching from direct charging to boosting charging, thus improving the efficiency of charging the power battery. And this implementation method can meet the user's needs for a single charging process.

[0104] The present application embodiment provides a computer-readable storage medium 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 embodiment is implemented. For example, Figure 8 or Fig. 9 The vehicle charging switching method shown.

[0105] Fig.10 1 is a schematic diagram 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, Figure 8 or Fig. 9 The vehicle charging switching method shown.

[0106] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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, characterized in that: The vehicle comprises 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, and the method comprises: 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, characterized in that: The first charging circuit includes a first switch, and the first switch is suitable for connecting a charging device to the power battery. The first charging circuit is used to directly charge the power battery, including: 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, characterized in that: In the case where the charging device performs constant current charging on the power battery, the method further includes: 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, characterized in that: Determining that the second charging circuit needs to be switched to boost charge the power battery includes: 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, characterized in that: The pre-charging unit includes 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 being connected to the first charging circuit, wherein controlling the first charging circuit to pre-charge the 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, characterized in that: The second charging circuit further includes 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 charge 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, characterized in that: Controlling the pre-charge switch to remain closed, and controlling the second switch to close, comprises: 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, characterized in that: The boost device is composed of an inverter bridge and motor windings in the vehicle.

9. The vehicle charging switching method according to claim 8, characterized in that: 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.

10. A computer-readable storage medium, characterized in that: A vehicle charging switching program is stored thereon, and when the vehicle charging switching program is executed by a processor, the vehicle charging switching method according to any one of claims 1-9 is implemented.

11. A charging controller, characterized in that: include: 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, characterized in that: include: 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, characterized in that: It comprises a power battery and a vehicle charging switching system according to claim 12.

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