Charging control method, charging system, controller and vehicle

Abstract

The invention relates to a charging control method, a charging system, a controller and a vehicle, and relates to the technical field of vehicles, and the method comprises the following steps: acquiring charging information of a power battery under the condition that the power battery is charged through a first charging port and a second charging port at the same time; and controlling the switch assembly according to the charging information so as to switch the charging mode. The charging modes are switched according to the charging information of the power battery, and different charging states of the power battery can be flexibly adapted.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicles, and in particular, to a charging control method, a charging system, a controller, and a vehicle. Background Art

[0002] With the rapid development of electric vehicles in the automotive industry, the charging speed and driving range of electric vehicles have attracted increasing attention from users. A charging system that uses a high-voltage battery pack above 500V and combines dual-gun charging is an effective solution to improve the charging speed and driving range of electric vehicles. At present, DC charging piles in the domestic market are mainly divided into low-voltage charging piles below 500V and high-voltage charging piles above 500V. Therefore, the charging system of electric vehicles using high-voltage battery packs needs to be compatible with DC charging piles with different output voltage ranges to meet market and user requirements. At the same time, most of the current market adopts a battery self-heating scheme to improve the heating efficiency. In related technologies, the power battery cannot be in the maximum power charging state for a long time during the entire charging cycle, and battery self-heating will cause uneven capacity among multiple battery packs in the power battery. Summary of the Invention

[0003] The purpose of the present disclosure is to provide a charging control method, a charging system, a controller, and a vehicle, which are used to increase the duration of the power battery in the maximum power charging state and at the same time achieve capacity balance among multiple battery packs.

[0004] According to a first aspect of an embodiment of the present disclosure, there is provided a charging control method, the method including:

[0005] When charging the power battery through a first charging port and a second charging port simultaneously, obtaining charging information of the power battery;

[0006] Controlling a switch assembly according to the charging information to switch the charging mode.

[0007] Optionally, the obtaining the charging information of the power battery includes:

[0008] When charging in a first charging mode, obtaining the charging information of the power battery and the current information of a target charging pile; the target charging pile includes the charging pile connected to the first charging port and the charging pile connected to the second charging port, and the first charging mode includes: the target charging pile charges the power battery through the first charging port and the second charging port;

[0009] The controlling the switch assembly according to the charging information to switch the charging mode includes:

[0010] Controlling the switch assembly according to the charging information and the current information to switch the charging mode.

[0011] Optionally, controlling the switch assembly according to the charging information and the current information to switch the charging mode includes:

[0012] When the maximum allowable charging voltage of the power battery, the maximum allowable charging current of the power battery, the maximum allowable charging voltage of the target battery pack, and the maximum allowable output current of each target charging pile meet the preset full-power output condition, controlling the switch assembly to switch the first charging mode to the second charging mode;

[0013] Wherein, the second charging mode includes: performing parallel charging on the first battery pack and the second battery pack through the first charging port, and performing parallel charging on the first battery pack and the second battery pack through the second charging port, wherein the power battery includes the first battery pack and the second battery pack, and the first battery pack and the second battery pack are connected in series;

[0014] The charging information includes: the maximum allowable charging voltage of the power battery, the maximum allowable charging current of the power battery, the maximum allowable charging voltage of the target battery pack; the target battery pack includes the first battery pack or the second battery pack; the current information includes the maximum allowable output current of each target charging pile.

[0015] Optionally, the preset full-power output condition includes:

[0016] The maximum allowable charging power of the power battery is less than the maximum allowable charging power of half a pack;

[0017] Wherein, the maximum allowable charging power of the power battery includes the product of the maximum allowable charging voltage of the power battery and the maximum allowable charging current of the power battery, and the maximum allowable charging power of half a pack includes the product of the sum of the maximum allowable output currents of multiple target charging piles and the maximum allowable charging voltage of the target battery pack.

[0018] Optionally, obtaining the charging information of the power battery includes:

[0019] When charging in the second charging mode, obtaining the charging information of the power battery.

[0020] Optionally, controlling the switch assembly according to the charging information to switch the charging mode includes:

[0021] When the first capacity or the second capacity reaches a preset capacity threshold, controlling the switch assembly to switch the charging mode; the charging information includes the first capacity of the first battery pack and the second capacity of the second battery pack, wherein the power battery includes the first battery pack and the second battery pack, and the first battery pack and the second battery pack are connected in series.

[0022] Optionally, when the first capacity or the second capacity reaches a preset capacity threshold, controlling the switch assembly to switch the charging mode includes:

[0023] When the first capacity reaches the preset capacity threshold, controlling the switch assembly to switch the second charging mode to a third charging mode; the third charging mode includes: charging the second battery pack through the first charging port and charging the second battery pack through the second charging port.

[0024] Optionally, when the first capacity or the second capacity reaches a preset capacity threshold, controlling the switch assembly to switch the charging mode includes:

[0025] When the second capacity reaches the preset capacity threshold, controlling the switch assembly to switch the second charging mode to a fourth charging mode; the fourth charging mode includes: charging the first battery pack through the first charging port and charging the first battery pack through the second charging port.

[0026] According to a second aspect of the embodiments of the present disclosure, a charging system is provided, the charging system includes: a charging circuit and a controller, the charging circuit and the controller are connected; the charging circuit includes: a first charging port, a second charging port, a power battery, and a switch assembly, the power battery includes a plurality of battery packs; the first charging port and the second charging port are respectively connected to the power battery through the switch assembly; the controller is configured to:

[0027] When charging the power battery through the first charging port and the second charging port simultaneously, obtaining charging information of the power battery;

[0028] Controlling the switch assembly according to the charging information to switch the charging mode.

[0029] Optionally, the switch assembly includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, and a transistor assembly; the power battery includes a first battery pack, a second battery pack, and a ninth switch;

[0030] The first end of the first switch is connected to the first end of the first charging port, and the second end of the first switch is connected to the first end of the transistor assembly; the first end of the second switch is connected to the second end of the first charging port, and the second end of the second switch is connected to the second end of the transistor assembly; the first end of the transistor assembly is further connected to the first end of the seventh switch, the second end of the seventh switch is connected to the first end of the first battery pack, the second end of the first battery pack is connected to the first end of the ninth switch, the second end of the ninth switch is connected to the first end of the second battery pack, the second end of the second battery is connected to the first end of the eighth switch, and the second end of the eighth switch is connected to the second end of the transistor assembly; the first end of the third switch is connected to the third end of the transistor assembly, and the second end of the third switch is connected to the second end of the first battery pack;

[0031] The first end of the fourth switch is connected to the first end of the second charging port, and the second end of the fourth switch is connected to the first end of the first battery pack; the first end of the fifth switch is connected to the second end of the second charging port, and the second end of the fifth switch is connected to the second end of the second battery pack; the first end of the sixth switch is connected to the first end of the second battery pack, and the second end of the sixth switch is connected to the first end of the first battery pack.

[0032] Optionally, the transistor assembly includes: a first transistor assembly, a second transistor assembly, an inductor assembly, and a capacitor assembly;

[0033] The second end of the first switch is connected to the first end of the first transistor assembly, the second end of the first transistor assembly is connected to the first end of the inductor assembly, and the second end of the inductor assembly is connected to the first end of the third switch; the first end of the inductor assembly is further connected to the first end of the second transistor assembly, and the second end of the second transistor assembly is connected to the second end of the second switch; the first end of the capacitor assembly is connected to the first end of the first transistor assembly, and the second end of the capacitor assembly is connected to the second end of the second transistor assembly.

[0034] Optionally, the controller is specifically configured to:

[0035] Control the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch to be closed, the ninth switch to be opened, and control the first transistor assembly to be opened and the second transistor assembly to be conducted, so as to charge the first battery pack through the first charging port and charge the second battery pack in parallel, and charge the first battery pack through the second charging port and charge the second battery pack in parallel.

[0036] Optionally, the controller is specifically configured to:

[0037] Control the first switch, the second switch, the fourth switch, the fifth switch, the sixth switch, and the eighth switch to be closed, the third switch, the seventh switch, and the ninth switch to be opened, and control the first transistor assembly and the second transistor assembly to be opened, so as to charge the second battery pack through the first charging port and charge the second battery pack through the second charging port.

[0038] Optionally, the controller is specifically configured to:

[0039] Control the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the seventh switch to be closed, the sixth switch, the eighth switch, and the ninth switch to be opened, and control the first transistor assembly to be opened and the second transistor assembly to be conducted, so as to charge the first battery pack through the first charging port and charge the first battery pack through the second charging port.

[0040] According to a third aspect of the embodiments of the present disclosure, there is provided a controller, including:

[0041] A memory storing a computer program thereon;

[0042] A processor configured to execute the computer program in the memory to implement the steps of the method according to the first aspect of the embodiments of the present disclosure.

[0043] According to a fourth aspect of the embodiments of the present disclosure, there is provided a vehicle, where the vehicle includes the controller according to the third aspect of the embodiments of the present disclosure.

[0044] According to a fifth aspect of the embodiments of the present disclosure, there is provided a vehicle, where the vehicle includes the charging system according to the second aspect of the embodiments of the present disclosure.

[0045] Through the above technical solutions, when the present disclosure charges the power battery through the first charging port and the second charging port simultaneously, it obtains the charging information of the power battery and controls the switch assembly according to the charging information to switch the charging mode. The present disclosure switches the charging mode according to the charging information of the power battery, and can flexibly adapt to different charging states of the power battery.

[0046] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The accompanying drawings are used to provide a further understanding of the present disclosure and form 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 to the present disclosure. In the accompanying drawings:

[0048] Figure 1 is a block diagram of a dual-gun charging system shown according to an exemplary embodiment;

[0049] Figure 2 is a schematic diagram of a battery self-heating system shown according to an exemplary embodiment;

[0050] Figure 3 is a flowchart of a charging control method shown according to an exemplary embodiment;

[0051] Figure 4 is a schematic diagram of a charging system shown according to an exemplary embodiment;

[0052] Figure 5 is a schematic diagram of a charging circuit shown according to an exemplary embodiment;

[0053] Figure 6 is a schematic diagram of another charging circuit shown according to an exemplary embodiment;

[0054] Figure 7 and Figure 8 is a schematic diagram of a first charging mode shown according to an exemplary embodiment;

[0055] Figure 9 and Figure 10 is a schematic diagram of a second charging mode shown according to an exemplary embodiment;

[0056] Figure 11 and Figure 12 is a schematic diagram of a third charging mode shown according to an exemplary embodiment;

[0057] Figure 13 and Figure 14 is a schematic diagram of a fourth charging mode shown according to an exemplary embodiment;

[0058] Figure 15 is a block diagram of another dual-gun charging system shown according to an exemplary embodiment;

[0059] Figure 16 is a schematic diagram of another charging circuit shown according to an exemplary embodiment;

[0060] Figure 17 is a schematic flowchart of a charging control method shown according to an embodiment of the present disclosure;

[0061] Figure 18It is a block diagram of a controller shown according to an exemplary embodiment;

[0062] Figure 19 It is a block diagram of a vehicle shown according to an exemplary embodiment;

[0063] Figure 20 It is a block diagram of another vehicle shown according to an exemplary embodiment.

[0064] Description of Reference Numerals

[0065] Charging system 200; charging circuit 201; controller 202; first charging port 2011; second charging port 2012; power battery 2013; switch assembly 2014; first battery pack 2013a; second battery pack 2013b; first switch S1; second switch S2; third switch S3; fourth switch S4; fifth switch S5; sixth switch S6; seventh switch S7; eighth switch S8; ninth switch S9; transistor assembly V; first transistor assembly V1; second transistor assembly V2; inductor assembly L; capacitor assembly C; vehicle 300. Detailed Description of the Embodiment

[0066] The following provides a detailed description of the specific embodiments of the present disclosure with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present disclosure and are not intended to limit the present disclosure.

[0067] Before introducing a charging control method, a charging system, a controller, and a vehicle shown in the embodiments of the present disclosure, the application scenarios related to the embodiments of the present disclosure will be introduced first.

[0068] In the related art, referring to Figure 1 , the dual-gun charging system is a first boost charging circuit plus a second direct connection charging circuit solution. The power battery of the charging vehicle is charged through the dual charging circuits, and the boost circuit is controlled according to the voltage magnitude of the external power supply to improve the charging speed of the electric vehicle and achieve high-power charging.

[0069] To be compatible with low-voltage DC charging piles below 500V, most dual-gun chargings adopt the boost charging solution for the first charging port. However, when the second charging port is connected to a low-voltage DC charging pile alone, it cannot charge a high-voltage battery pack; at the same time, when the first charging port is connected to a DC pile and the second charging port is connected to a non-high-voltage DC charging pile, the high-voltage battery pack cannot be charged simultaneously with both guns. That is, the two charging ports of the dual-gun charging system cannot be compatible with high- and low-voltage charging piles at the same time.

[0070] Currently, most of the market adopts the battery self-heating solution to improve the heating efficiency. Referring to Figure 2, the system includes: a power battery pack connected in series including a first battery pack and a second battery pack, and phase-shifted control of n buck-boost inverters is adopted to achieve simultaneous self-heating of the first battery pack and the second battery pack. Due to control deviations and deviations existing in the actual system, etc., the currents of the two half-pack battery packs during alternating charging will not be exactly the same, resulting in a problem of capacity imbalance between the first battery pack and the second battery pack.

[0071] Figure 3 is a flowchart of a charging control method shown according to an exemplary embodiment, as Figure 3 shown, the method may include:

[0072] Step S101, when charging the power battery through the first charging port and the second charging port simultaneously, obtain the charging information of the power battery.

[0073] Step S102, control the switch assembly according to the charging information to switch the charging mode.

[0074] Exemplarily, the state of the charging circuit can be periodically inspected to determine whether the conditions for entering the dual-gun charging process are met. Among them, the conditions for entering the dual-gun charging process include: 1) The first charging port is connected to a DC charging gun and the charging handshake has been successful; 2) The second charging port is connected to a DC charging gun and the charging handshake has been successful. When the conditions for entering the dual-gun charging process are met, obtain the first maximum output voltage of the first charging pile connected to the first charging port, and the second maximum output voltage of the second charging pile connected to the second charging port, and determine the corresponding dual-gun charging mode according to the first maximum output voltage, the second maximum output voltage and the battery voltage of the power battery.

[0075] When both the first maximum output voltage and the second maximum output voltage are greater than or equal to the battery voltage of the power battery, the charging circuit can be controlled to switch to the first charging mode. Among them, the first charging mode may include: simultaneously charging the first battery pack and the second battery pack in series through the first charging port and the second charging port. When at least one of the first maximum output voltage and the second maximum output voltage is less than the battery voltage of the power battery, the charging circuit can be controlled to switch to the first charging mode. Among them, the second charging mode may include: charging the first battery pack and the second battery pack in parallel through the first charging port, and charging the first battery pack and the second battery pack in parallel through the second charging port.

[0076] In the first charging mode and the second charging mode, the charging information of the power battery can be monitored in real time, and the switch assembly can be controlled according to the charging information, so as to switch to the charging mode corresponding to the charging information.

[0077] In some embodiments, when the charging circuit charges in the first charging mode, the charging information of the power battery, as well as the current information of the first charging pile and the second charging pile, can be obtained simultaneously. When the charging information and the current information meet the preset full-power output condition, it indicates that the charging power corresponding to the second charging mode is greater than the charging power corresponding to the first charging mode. Then, the switch component can be controlled to switch the first charging mode to the second charging mode to improve the charging efficiency.

[0078] In some other embodiments, when the charging circuit charges in the second charging mode, the charging information may include the first capacity of the first battery pack and the second capacity of the second battery pack. When the first capacity or the second capacity reaches the preset capacity threshold, the switch component can be controlled to switch the charging mode. When the first capacity reaches the preset capacity threshold, the switch component can be controlled to switch the second charging mode to the third charging mode to stop charging the first battery pack and charge the second battery pack simultaneously through the first charging port and the second charging port, achieving the capacity balance between the first battery pack and the second battery pack. Among them, the third charging mode may include: charging the second battery pack through the first charging port and charging the second battery pack through the second charging port. When the second capacity reaches the preset capacity threshold, the switch component can be controlled to switch the second charging mode to the fourth charging mode to stop charging the second battery pack and charge the first battery pack simultaneously through the first charging port and the second charging port, achieving the capacity balance between the first battery pack and the second battery pack. Among them, the fourth charging mode includes: charging the first battery pack through the first charging port and charging the first battery pack through the second charging port.

[0079] In summary, when the present disclosure charges the power battery simultaneously through the first charging port and the second charging port, it obtains the charging information of the power battery and controls the switch component according to the charging information to switch the charging mode. The present disclosure switches the charging mode according to the charging information of the power battery, which can flexibly adapt to different charging states of the power battery, enabling the power battery to be in the maximum power charging state for a longer time and at the same time achieving the capacity balance between multiple battery packs.

[0080] According to some embodiments shown in the present disclosure, one implementation manner of step S101 may be:

[0081] When the charging circuit charges in the first charging mode, obtain the charging information of the power battery and the current information of the target charging pile. The target charging pile includes the charging pile connected to the first charging port and the charging pile connected to the second charging port.

[0082] Correspondingly, one implementation manner of step S102 may be:

[0083] Control the switch assembly according to the charging information and current information to switch the charging mode.

[0084] In some embodiments, the charging information may include: the maximum allowable charging voltage of the power battery, the maximum allowable charging current of the power battery, and the maximum allowable charging voltage of the target battery pack. The target battery pack may be the first battery pack or the second battery pack, that is, the maximum allowable charging voltage of the target battery pack is half of the maximum allowable charging voltage of the power battery. The current information may include the maximum allowable output current of each target charging pile. When the maximum allowable charging voltage of the power battery, the maximum allowable charging current of the power battery, the maximum allowable charging voltage of the target battery pack, and the maximum allowable output current of each target charging pile meet the preset full-power output condition, control the switch assembly to switch the first charging mode to the second charging mode.

[0085] In some other embodiments, the preset full-power output condition may include: the maximum allowable charging power of the power battery is less than half of the maximum allowable charging power. Wherein, the maximum allowable charging power of the power battery includes the product of the maximum allowable charging voltage of the power battery and the maximum allowable charging current of the power battery, and half of the maximum allowable charging power includes the product of the sum of the maximum allowable output currents of multiple target charging piles and the maximum allowable charging voltage of the target battery pack.

[0086] For example, if the maximum allowable charging voltage of the power battery, the maximum allowable charging current of the power battery, the maximum allowable charging voltage of the target battery pack, and the maximum allowable output current of each target charging pile meet the preset full-power output condition, indicating that the charging power corresponding to the charging mode of double-gun half-pack parallel is greater than the charging power corresponding to the charging mode of double-gun full-pack series, then the first charging mode can be switched to the second charging mode, charge the first battery pack and perform parallel charging on the second battery pack through the first charging port, and charge the first battery pack and perform parallel charging on the second battery pack through the second charging port, so that the charging pile outputs at full power for the longest time, thereby improving the charging efficiency.

[0087] According to some other embodiments of the present disclosure, one implementation manner of step S101 may be:

[0088] When the charging circuit is charged in the second charging mode, obtain the charging information of the power battery.

[0089] Wherein, the charging information may include the first capacity of the first battery pack and the second capacity of the second battery pack. Correspondingly, one implementation manner of step S102 may be:

[0090] When the first capacity or the second capacity reaches the preset capacity threshold, control the switch assembly to switch the charging mode.

[0091] In some embodiments, when the first capacity reaches a preset capacity threshold and the second capacity does not reach the preset capacity threshold, it indicates that the first battery pack is fully charged and the second battery pack is not fully charged. Then, the switch assembly can be controlled to switch the second charging mode to the third charging mode. In this way, when the first battery pack is fully charged and the second battery pack is not fully charged, charging of the first battery pack is stopped, and the second battery pack is charged simultaneously through the first charging port and the second charging port, achieving capacity balance between the first battery pack and the second battery pack.

[0092] In other embodiments, when the second capacity reaches the preset capacity threshold and the first capacity does not reach the preset capacity threshold, it indicates that the second battery pack is fully charged and the first battery pack is not fully charged. Then, the switch assembly can be controlled to switch the second charging mode to the fourth charging mode. In this way, when the second battery pack is fully charged and the first battery pack is not fully charged, charging of the second battery pack is stopped, and the first battery pack is charged simultaneously through the first charging port and the second charging port, achieving capacity balance between the first battery pack and the second battery pack.

[0093] In summary, when the power battery is charged simultaneously through the first charging port and the second charging port, the present disclosure obtains the charging information of the power battery and controls the switch assembly according to the charging information to switch the charging mode. By switching the charging mode according to the charging information of the power battery, the present disclosure can flexibly adapt to different charging states of the power battery, enabling the power battery to be in the maximum power charging state for a longer time and achieving capacity balance between multiple battery packs.

[0094] Figure 4 is a schematic diagram of a charging system shown according to an exemplary embodiment. As Figure 4 shown, the charging system 200 includes: a charging circuit 201 and a controller 202, and the charging circuit 201 is connected to the controller 202. The charging circuit 201 includes: a first charging port 2011, a second charging port 2012, a power battery 2013, and a switch assembly 2014. The power battery 2013 includes multiple battery packs. The first charging port 2011 and the second charging port 2012 are respectively connected to the power battery 2013 through the switch assembly 2014. The controller 202 is configured to:

[0095] When the power battery is charged simultaneously through the first charging port and the second charging port, obtain the charging information of the power battery.

[0096] Control the switch assembly according to the charging information to switch the charging mode.

[0097] For example, the controller can periodically inspect the status of the charging circuit to determine whether the conditions for entering the dual-gun charging process are met. Among them, the conditions for entering the dual-gun charging process include: 1) The first charging port is connected to a DC charging gun and the charging handshake has been successful; 2) The second charging port is connected to a DC charging gun and the charging handshake has been successful. When the conditions for entering the dual-gun charging process are met, obtain the first maximum output voltage of the first charging pile connected to the first charging port, and the second maximum output voltage of the second charging pile connected to the second charging port, and determine the corresponding dual-gun charging mode based on the first maximum output voltage, the second maximum output voltage, and the battery voltage of the power battery.

[0098] When both the first maximum output voltage and the second maximum output voltage are greater than or equal to the battery voltage of the power battery, the charging circuit can be controlled to switch to the first charging mode. Among them, the first charging mode can include: simultaneously charging the first battery pack and the second battery pack in series through the first charging port and the second charging port. When at least one of the first maximum output voltage and the second maximum output voltage is less than the battery voltage of the power battery, the charging circuit can be controlled to switch to the first charging mode. Among them, the second charging mode can include: charging the first battery pack and the second battery pack in parallel through the first charging port, and charging the first battery pack and the second battery pack in parallel through the second charging port.

[0099] In the first charging mode and the second charging mode, the charging information of the power battery can be monitored in real time, and the switch component can be controlled according to the charging information, so as to switch to the charging mode corresponding to the charging information.

[0100] In some embodiments, when the charging circuit is charging in the first charging mode, the charging information of the power battery, as well as the current information of the first charging pile and the second charging pile, can be obtained simultaneously. When the charging information and the current information meet the preset full-power output condition, it means that the charging power corresponding to the second charging mode is greater than the charging power corresponding to the first charging mode. Then, the switch component can be controlled to switch the first charging mode to the second charging mode to improve the charging efficiency.

[0101] In some other embodiments, when the charging circuit charges in the second charging mode, the charging information may include the first capacity of the first battery pack and the second capacity of the second battery pack. When the first capacity or the second capacity reaches a preset capacity threshold, the switch assembly may be controlled to switch the charging mode. When the first capacity reaches the preset capacity threshold, the switch assembly may be controlled to switch the second charging mode to the third charging mode, so as to stop charging the first battery pack and charge the second battery pack simultaneously through the first charging port and the second charging port, achieving capacity balance between the first battery pack and the second battery pack. Among them, the third charging mode may include: charging the second battery pack through the first charging port and charging the second battery pack through the second charging port. When the second capacity reaches the preset capacity threshold, the switch assembly may be controlled to switch the second charging mode to the fourth charging mode, so as to stop charging the second battery pack and charge the first battery pack simultaneously through the first charging port and the second charging port, achieving capacity balance between the first battery pack and the second battery pack. Among them, the fourth charging mode includes: charging the first battery pack through the first charging port and charging the first battery pack through the second charging port.

[0102] In summary, when the present disclosure simultaneously charges the power battery through the first charging port and the second charging port, the charging information of the power battery is obtained, and the switch assembly is controlled according to the charging information to switch the charging mode. The present disclosure switches the charging mode according to the charging information of the power battery, can flexibly adapt to different charging states of the power battery, enables the power battery to be in the maximum power charging state for a longer time, and can achieve capacity balance between multiple battery packs.

[0103] Figure 5 is a schematic diagram of a charging circuit shown according to an exemplary embodiment, as Figure 5 shown, the switch assembly 2014 includes a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a fifth switch S5, a sixth switch S6, a seventh switch S7, an eighth switch S8, and a transistor assembly V. The power battery 2013 includes a first battery pack 2013a, a second battery pack 2013b, and a ninth switch S9.

[0104] The first end of the first switch S1 is connected to the first end of the first charging port 2011, and the second end of the first switch S1 is connected to the first end of the transistor assembly V. The first end of the second switch S2 is connected to the second end of the first charging port 2011, and the second end of the second switch S2 is connected to the second end of the transistor assembly V. The first end of the transistor assembly V is further connected to the first end of the seventh switch S7. The second end of the seventh switch S7 is connected to the first end of the first battery pack 2013a. The second end of the first battery pack 2013a is connected to the first end of the ninth switch S9. The second end of the ninth switch S9 is connected to the first end of the second battery pack 2013b. The second end of the second battery pack 2013b is connected to the first end of the eighth switch S8. The second end of the eighth switch S8 is connected to the second end of the transistor assembly V. The first end of the third switch S3 is connected to the third end of the transistor assembly V, and the second end of the third switch S3 is connected to the second end of the first battery pack 2013a.

[0105] The first end of the fourth switch S4 is connected to the first end of the second charging port 2012, and the second end of the fourth switch S4 is connected to the first end of the first battery pack 2013a. The first end of the fifth switch S5 is connected to the second end of the second charging port 2012, and the second end of the fifth switch S5 is connected to the second end of the second battery pack 2013b. The first end of the sixth switch S6 is connected to the first end of the second battery pack 2013b, and the second end of the sixth switch S6 is connected to the first end of the first battery pack 2013a.

[0106] Figure 6 is a schematic diagram of another charging circuit shown according to an exemplary embodiment, as Figure 6 shown, the transistor assembly V includes: a first transistor assembly V1, a second transistor assembly V2, an inductor assembly L, and a capacitor assembly C.

[0107] The second end of the first switch S1 is connected to the first end of the first transistor assembly V1. The second end of the first transistor assembly V1 is connected to the first end of the inductor assembly L. The second end of the inductor assembly L is connected to the first end of the third switch S3. The first end of the inductor assembly L is further connected to the first end of the second transistor assembly V2. The second end of the second transistor assembly V2 is connected to the second end of the second switch S2. The first end of the capacitor assembly C is connected to the first end of the first transistor assembly V1, and the second end of the capacitor assembly C is connected to the second end of the second transistor assembly V2.

[0108] In some embodiments, the first charging mode can be Figure 7 and Figure 8 the charging mode superimposed by the charging circuits shown in Figure 9 and Figure 10 the charging mode superimposed by the charging circuits shown in Figure 11 andFigure 12 The charging mode with the charging circuits superimposed as shown, the fourth charging mode can be Figure 13 and Figure 14 the charging mode with the charging circuits superimposed as shown.

[0109] Exemplarily, the second charging mode can be implemented as follows: control the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch and the eighth switch to be closed, the ninth switch to be open, and control the first transistor assembly to be open and the second transistor assembly to be conducting, so as to charge the first battery pack through the first charging port and charge the second battery pack in parallel, and charge the first battery pack through the second charging port and charge the second battery pack in parallel.

[0110] The third charging mode can be implemented as follows: control the first switch, the second switch, the fourth switch, the fifth switch, the sixth switch and the eighth switch to be closed, the third switch, the seventh switch and the ninth switch to be open, and control the first transistor assembly and the second transistor assembly to be open, so as to charge the second battery pack through the first charging port and charge the second battery pack through the second charging port.

[0111] The fourth charging mode can be implemented as follows: control the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the seventh switch to be closed, the sixth switch, the eighth switch and the ninth switch to be open, and control the first transistor assembly to be open and the second transistor assembly to be conducting, so as to charge the first battery pack through the first charging port and charge the first battery pack through the second charging port.

[0112] In summary, the present disclosure is applied to a charging circuit, the charging circuit includes: a first charging port, a second charging port, a power battery, and a switch assembly, the power battery includes a plurality of battery packs, and the first charging port and the second charging port are respectively connected to the power battery through the switch assembly. When charging the power battery through the first charging port and the second charging port simultaneously, obtain the charging information of the power battery, and control the switch assembly according to the charging information to switch the charging mode. The present disclosure switches the charging mode according to the charging information of the power battery, can flexibly adapt to different charging states of the power battery, enables the power battery to be in the maximum power charging state for a longer time, and can simultaneously achieve capacity balance between multiple battery packs.

[0113] A specific embodiment is given below, this embodiment is based on as Figure 15Principle of the block diagram. The dual-gun charging system includes: a power battery, a buck-boost module, a first charging port circuit, a second charging port circuit, a control unit, etc. The power battery includes Pack 1, switch K5, and Pack 2 connected in series. The buck-boost module consists of a capacitor and n buck-boost inverters. Each buck-boost inverter includes an inverter bridge and an inductor. One end of the inductor is connected to the midpoint of the corresponding inverter bridge, and the other end is connected to the positive pole of the charging port. n is an integer equal to or greater than 1. The control unit interacts with the DC charging piles connected to the first charging port and the second charging port to judge the voltage magnitude of the external power supply and control the charging system to enter the appropriate charging circuit. The positive and negative poles of the first charging port are connected to the motor bus, and a wire is led out between Pack 2 and switch K5 and connected to the motor neutral line, i.e., the battery self-heating circuit.

[0114] Figure 16 It is a specific embodiment that reuses the vehicle drive motor based on the battery self-heating circuit. Figure 16 The dual-gun charging system in it includes: Pack 1, Pack 2, switch K5, switch K1, switch K2, switch K9, switch K6, switch K8, resistor R, switching tubes VT1 / VT2 / VT3 / VT4 / VT5 / VT6, diodes VD1 / VD2 / VD3 / VD4 / VD5 / VD6, capacitor C1, switch K7, switch K10, switch K3, switch K4. Among them, the first charging port circuit includes: the first charging port, switch K1, switch K2, switch K5, switch K6, switch K7, switch K8, switch K9, resistor R, switching tubes VT1 / VT2 / VT3 / VT4 / VT5 / VT6, diodes VD1 / VD2 / VD3 / VD4 / VD5 / VD6, capacitor C1. The second charging port circuit includes: the second charging port, switch K3, switch K4, switch K10.

[0115] Figure 17 It is a schematic flowchart of a charging control method shown according to an embodiment of the present disclosure. As Figure 17 shown, the control logic steps of the specific method are as follows:

[0116] Step 1: The control system monitors in real time. When it is judged that the conditions for entering the dual-gun charging process are met, go to Step 2. The conditions for entering the dual-gun charging process include all of the following:

[0117] ① The first charging port is connected to the DC charging gun, and the charging handshake has been successful;

[0118] ② The second charging port is connected to the DC charging gun, and the charging handshake has been successful.

[0119] Step 2: The control module judges whether the voltage condition of charging mode 1 is met according to the maximum output voltage of the charging pile. If it is met, go to Step 3; otherwise, jump to Step 5. The voltage conditions of charging mode 1 include all of the following:

[0120] ① The maximum output voltage of the charging pile 1 connected to the first charging port is greater than the voltage of the entire battery pack.

[0121] ② The maximum output voltage of the charging pile 2 connected to the second charging port is greater than the voltage of the entire battery pack.

[0122] Step 3: The control module controls the dual-gun charging system to execute charging mode 1: dual-gun direct connection to the entire pack for charging. That is, it controls the first charging circuit to execute the charging circuit for connecting to the entire pack, and the second charging circuit to execute the charging circuit for connecting to the entire pack.

[0123] Step 4: The control module monitors in real time the maximum allowable charging current of the entire battery pack, the maximum allowable charging voltage of the entire battery pack, the maximum allowable charging voltage of half of the battery pack, and the maximum allowable output current of charging pile 1 and charging pile 2 to calculate the charging power, and determines whether the conditions for full-power output of the priority charging pile are met. If so, it enters Step 5. The conditions for full-power output of the priority charging pile are:

[0124] (The maximum allowable charging current of the entire battery pack × the maximum allowable charging voltage of the entire battery pack) < [(The maximum allowable output current of charging pile 1 + the maximum allowable output current of charging pile 2) × the maximum allowable charging voltage of half of the battery pack].

[0125] Step 5: The control module controls the dual-gun charging system to execute charging mode 2: dual-gun half-pack parallel charging. That is, it controls the switch K5 to be disconnected, connects battery pack 1 and pack 2 in parallel, the first charging circuit executes dual-gun half-pack parallel charging, and the second charging circuit executes dual-gun half-pack parallel charging.

[0126] Step 6: The control mode monitors the battery capacity in real time: monitors the current capacity status of battery pack 1 and pack 2. Then it enters Step 7.

[0127] Step 7: The control module determines that the conditions for balancing battery pack 1 are met, that is, pack 1 is not fully charged but pack 2 is fully charged, and then enters Step 8. The control module determines that the conditions for balancing battery pack 2 are met, that is, pack 2 is not fully charged but pack 1 is fully charged, and then enters Step 11.

[0128] Step 8: The first charging circuit switches to the single charging mode for pack 1 and updates the charging demand, then enters Step 9.

[0129] Step 9: The second charging circuit switches to the single charging mode for pack 1 and updates the charging demand, then enters Step 10.

[0130] Step 10: The control module controls the charging system to enter charging mode 3: independent half-pack charging for pack 1. Then it enters Step 14.

[0131] Step 11: The first charging circuit switches to the single charging mode for pack 2 and updates the charging demand, then enters Step 12.

[0132] Step 12: The second charging circuit switches to the individual charging mode for Package 2, updates the charging requirement, and proceeds to Step 13.

[0133] Step 13: The control module controls the charging system to enter Charging Mode 4: Independent half-pack charging for Package 2. Proceed to Step 14.

[0134] Step 14: The control module determines that the full charge condition for the entire battery pack is met, i.e., both Package 1 and Package 2 are fully charged, and proceeds to Step 15.

[0135] Step 15: Disconnect the current charging circuit and exit the charging process.

[0136] The above control module can be a single controller or multiple controllers that communicate and interact with each other to jointly complete the above control steps.

[0137] Through the above control method, when the dual guns of a high- and low-voltage DC charging pile are connected, by identifying the maximum output voltage of the charging pile, the charging circuit is controlled to enter Charging Mode 1 or Charging Mode 2, solving the problem that the second charging port of the dual-gun charging system for high-voltage battery platforms cannot achieve dual-gun charging when connected to a low-voltage DC charging pile, and improving the compatibility of the charging pile.

[0138] Through the above control method, the current maximum allowable charging currents of Battery Pack 1 and Battery Pack 2, and the maximum allowable output currents of Charging Piles 1 and 2 are continuously judged in real time, controlling the jump between Charging Mode 1 and Charging Mode 2, enabling the charging pile to maintain full-power output for the longest time, and improving the charging efficiency. The control realizes independent charging of Battery Pack 1 or Battery Pack 2, solving the problem of capacity imbalance between Battery Pack 1 and Battery Pack 2 caused by battery self-heating.

[0139] Figure 18 It is a block diagram of a controller shown according to an exemplary embodiment. As Figure 18 shown, the controller 202 may include: a processor 2021, a memory 2022. The controller 202 may further include one or more of a multimedia component 2023, an input / output (I / O) interface 2024, and a communication component 2025.

[0140] Among them, the processor 2021 is used to control the overall operation of the controller 202 to complete all or part of the steps in the above charging control method. The memory 2022 is used to store various types of data to support the operation of the controller 202. These data may include, for example, instructions for any application or method operating on the controller 202, as well as application-related data, such as contact data, received and sent messages, pictures, audio, video, and so on. The memory 2022 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disc. The multimedia component 2023 may include a screen and an audio component. The screen can be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal can be further stored in the memory 2022 or sent through the communication component 2025. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 2024 provides an interface between the processor 2021 and other interface modules. The above other interface modules can be a keyboard, a mouse, buttons, etc. These buttons can be virtual buttons or physical buttons. The communication component 2025 is used for wired or wireless communication between the controller 202 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, is not limited here. Therefore, the corresponding communication component 2025 may include: a Wi-Fi module, a Bluetooth module, an NFC module, and so on.

[0141] In an exemplary embodiment, the controller 202 can be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components, and is used to execute the above-mentioned charging control method.

[0142] In another exemplary embodiment, a computer-readable storage medium including program instructions is further provided. When the program instructions are executed by a processor, the steps of the above-mentioned charging control method are implemented. For example, the computer-readable storage medium can be the above-mentioned memory 2022 including program instructions, and the above-mentioned program instructions can be executed by the processor 2021 of the controller 202 to complete the above-mentioned charging control method.

[0143] Figure 19 is a block diagram of a vehicle shown according to an exemplary embodiment, as Figure 19 shown, a controller 202 is provided on the vehicle 300.

[0144] Figure 20 is a block diagram of another vehicle shown according to an exemplary embodiment, as Figure 20 shown, a charging system 200 is provided on the vehicle 300.

[0145] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0146] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination manners.

[0147] In addition, any combination can be made between various different embodiments of the present disclosure as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A charging control method, characterized in that, the method includes: acquiring charging information of the power battery when charging the power battery simultaneously through a first charging port and a second charging port; controlling a switch assembly according to the charging information to switch the charging mode.

2. The method according to claim 1, characterized in that, the acquiring of the charging information of the power battery includes: when charging in a first charging mode, acquiring the charging information of the power battery and the current information of a target charging pile; the target charging pile includes the charging pile connected to the first charging port and the charging pile connected to the second charging port, and the first charging mode includes: the target charging pile charges the power battery through the first charging port and the second charging port; the controlling of the switch assembly according to the charging information to switch the charging mode includes: controlling the switch assembly according to the charging information and the current information to switch the charging mode.

3. The method according to claim 2, characterized in that, the controlling of the switch assembly according to the charging information and the current information to switch the charging mode includes: when the maximum allowable charging voltage of the power battery, the maximum allowable charging current of the power battery, the maximum allowable charging voltage of a target battery pack, and the maximum allowable output current of each target charging pile meet a preset full-power output condition, controlling the switch assembly to switch the first charging mode to a second charging mode; wherein, the second charging mode includes: charging a first battery pack and a second battery pack in parallel through the first charging port, and charging the first battery pack and the second battery pack in parallel through the second charging port, wherein the power battery includes the first battery pack and the second battery pack, and the first battery pack and the second battery pack are connected in series; the charging information includes: the maximum allowable charging voltage of the power battery, the maximum allowable charging current of the power battery, the maximum allowable charging voltage of a target battery pack; the target battery pack includes the first battery pack or the second battery pack; the current information includes the maximum allowable output current of each target charging pile.

4. The method according to claim 3, characterized in that, the preset full-power output condition includes: the maximum allowable charging power of the power battery is less than the maximum allowable charging power of half a pack; wherein, the maximum allowable charging power of the power battery includes the product of the maximum allowable charging voltage of the power battery and the maximum allowable charging current of the power battery, and the maximum allowable charging power of half a pack includes the product of the sum of the maximum allowable output currents of multiple target charging piles and the maximum allowable charging voltage of the target battery pack.

5. The method according to claim 1, characterized in that, the acquiring of the charging information of the power battery includes: when charging in a second charging mode, acquiring the charging information of the power battery.

6. The method according to claim 5, characterized in that, the controlling of the switch assembly according to the charging information to switch the charging mode includes: When the first capacity or the second capacity reaches a preset capacity threshold, control the switch assembly to switch the charging mode; the charging information includes the first capacity of the first battery pack and the second capacity of the second battery pack, where the power battery includes the first battery pack and the second battery pack, and the first battery pack and the second battery pack are connected in series.

7. The method according to claim 6, wherein, the controlling the switch assembly to switch the charging mode when the first capacity or the second capacity reaches a preset capacity threshold includes: when the first capacity reaches the preset capacity threshold, controlling the switch assembly to switch the second charging mode to a third charging mode; the third charging mode includes: charging the second battery pack through the first charging port and charging the second battery pack through the second charging port.

8. The method according to claim 6, wherein, the controlling the switch assembly to switch the charging mode when the first capacity or the second capacity reaches a preset capacity threshold includes: when the second capacity reaches the preset capacity threshold, controlling the switch assembly to switch the second charging mode to a fourth charging mode; the fourth charging mode includes: charging the first battery pack through the first charging port and charging the first battery pack through the second charging port.

9. A charging system, wherein, the charging system includes: a charging circuit and a controller, the charging circuit and the controller are connected; the charging circuit includes: a first charging port, a second charging port, a power battery and a switch assembly, the power battery includes a plurality of battery packs; the first charging port and the second charging port are respectively connected to the power battery through the switch assembly; the controller is configured to: acquire the charging information of the power battery when charging the power battery through the first charging port and the second charging port simultaneously; control the switch assembly according to the charging information to switch the charging mode.

10. The system according to claim 9, wherein, the switch assembly includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch and a transistor assembly; the power battery includes a first battery pack, a second battery pack and a ninth switch; The first end of the first switch is connected to the first end of the first charging port, and the second end of the first switch is connected to the first end of the transistor assembly; the first end of the second switch is connected to the second end of the first charging port, and the second end of the second switch is connected to the second end of the transistor assembly; the first end of the transistor assembly is further connected to the first end of the seventh switch, the second end of the seventh switch is connected to the first end of the first battery pack, the second end of the first battery pack is connected to the first end of the ninth switch, the second end of the ninth switch is connected to the first end of the second battery pack, the second end of the second battery is connected to the first end of the eighth switch, and the second end of the eighth switch is connected to the second end of the transistor assembly; the first end of the third switch is connected to the third end of the transistor assembly, and the second end of the third switch is connected to the second end of the first battery pack; The first end of the fourth switch is connected to the first end of the second charging port, and the second end of the fourth switch is connected to the first end of the first battery pack; the first end of the fifth switch is connected to the second end of the second charging port, and the second end of the fifth switch is connected to the second end of the second battery pack; the first end of the sixth switch is connected to the first end of the second battery pack, and the second end of the sixth switch is connected to the first end of the first battery pack.

11. The system according to claim 10, wherein, the transistor assembly includes: a first transistor assembly, a second transistor assembly, an inductor assembly, and a capacitor assembly; the second end of the first switch is connected to the first end of the first transistor assembly, the second end of the first transistor assembly is connected to the first end of the inductor assembly, and the second end of the inductor assembly is connected to the first end of the third switch; the first end of the inductor assembly is further connected to the first end of the second transistor assembly, and the second end of the second transistor assembly is connected to the second end of the second switch; the first end of the capacitor assembly is connected to the first end of the first transistor assembly, and the second end of the capacitor assembly is connected to the second end of the second transistor assembly.

12. The system according to claim 11, wherein, the controller is specifically configured to: control the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch to be closed, the ninth switch to be open, and control the first transistor assembly to be open and the second transistor assembly to be conductive, so as to charge the first battery pack through the first charging port and charge the second battery pack in parallel, and charge the first battery pack and charge the second battery pack in parallel through the second charging port.

13. The system according to claim 11, wherein, the controller is specifically configured to: Control the first switch, the second switch, the fourth switch, the fifth switch, the sixth switch, and the eighth switch to close, open the third switch, the seventh switch, and the ninth switch, and control the first transistor assembly and the second transistor assembly to open, so as to charge the second battery pack through the first charging port and charge the second battery pack through the second charging port.

14. The system according to claim 11, wherein, the controller is specifically configured to: Control the first switch, the second switch, the third switch, the fourth switch, the fifth switch, and the seventh switch to close, open the sixth switch, the eighth switch, and the ninth switch, and control the first transistor assembly to open and the second transistor assembly to conduct, so as to charge the first battery pack through the first charging port and charge the first battery pack through the second charging port.

15. A controller, wherein, comprising: a memory storing a computer program thereon; a processor configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1-8.

16. A vehicle, wherein, the vehicle includes the controller according to claim 15.

17. A vehicle, wherein, the vehicle includes the charging system according to any one of claims 9-14.

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