Charging method of vehicle and vehicle

Abstract

The application provides a charging method of a vehicle and the vehicle. The vehicle comprises a power battery, a battery management system and a plurality of charging interfaces. Each charging interface is connected to the power battery through an independent charging line, and each charging interface is connected to the battery management system through an independent communication bus. The battery management system is connected to the power battery. The plurality of charging interfaces are used to be connected to a charging gun of one or more charging piles. The charging method comprises the following steps: after at least two charging interfaces in the plurality of charging interfaces establish communication with the charging pile, the charging capacity of the charging pile is obtained. According to the charging capacity of the charging pile, the charging demand of each of the at least two charging interfaces is determined. According to the charging demand of each of the at least two charging interfaces, the charging pile is controlled to output the charging demand of the corresponding connected charging interface through the charging gun to charge the power battery. This is favorable for realizing more accurate charging demand allocation among the plurality of charging interfaces, thereby improving the control accuracy of the vehicle charging process.

Description

TECHNICAL FIELD

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

[0002] With the gradual popularization of new energy vehicles, the charging demand of power batteries in new energy vehicles increases. Especially in scenarios where the number of vehicles to be charged is large and the battery capacity of the power battery of the vehicle is large, the demand for improving charging efficiency to save charging time is particularly significant. In order to improve the charging efficiency of the vehicle and shorten the charging time of a single vehicle, in the related art, two charging interfaces are provided on the vehicle to allow two charging guns to charge the power battery of the vehicle at the same time. However, in the related art, the two charging interfaces often share the same charging process, and the charging process needs to be started and stopped at the same time, so the control flexibility is low. Under this limitation, the control accuracy of the charging process needs to be improved. SUMMARY

[0003] The present application provides a charging method of a vehicle and the vehicle to improve the accuracy of the vehicle charging process.

[0004] The present application provides a charging method of a vehicle, the vehicle comprising a power battery, a battery management system and a plurality of charging interfaces, each charging interface being connected to the power battery through an independent charging line, and each charging interface being connected to the battery management system through an independent communication bus, the battery management system being connected to the power battery; the plurality of charging interfaces are used to connect to the charging guns of one or more charging piles; the charging method comprises: after at least two charging interfaces in the plurality of charging interfaces establish communication with the charging pile, obtaining the charging capacity of the charging pile; determining the charging demand of each of the at least two charging interfaces according to the charging capacity of the charging pile; and controlling the charging pile to output the charging demand of the corresponding connected charging interface through the charging gun according to the charging demand of each of the at least two charging interfaces, so as to charge the power battery.

[0005] Optionally, according to the charging capacity of the charging pile, the charging demand of the at least two charging interfaces is determined, comprising: obtaining the total demand current and the total demand voltage required for charging the power battery, the total demand voltage being the demand voltage of each of the at least two charging interfaces; and according to the charging capacity of the charging pile, the total demand current is allocated to determine the demand current of each of the at least two charging interfaces.

[0006] Optionally, the charging capability of the charging pile comprises a maximum output power of the charging pile; the at least two charging interfaces are connected to the plurality of charging piles; and the total demand current is allocated according to the charging capability of the charging pile to determine the demand current of each charging interface connected to the charging pile, comprising: in a case that the maximum output power of the charging pile can independently satisfy the total demand current and the total demand voltage, the total demand current is equally divided as the demand current of each charging interface connected to the charging pile; and in a case that the maximum output power of at least one of the plurality of charging piles cannot independently satisfy the total demand current and the total demand voltage, the total demand current is allocated according to the difference between the maximum output powers of the plurality of charging piles.

[0007] Optionally, the total demand current is allocated according to the difference between the maximum output powers of the charging piles connected to each charging interface to determine the demand current of each charging interface connected to the charging pile, comprising: in a case that the difference is less than or equal to a difference threshold, the total demand current is equally divided; and in a case that the difference is greater than the difference threshold, the total demand current is sequentially allocated to the at least two charging interfaces in an order from small to large of the maximum output powers of the plurality of charging piles until the demand current and the demand voltage of the charging interface reach the maximum output power of the charging pile connected to the charging interface, or the total sum of the allocated demand currents reaches the total demand current.

[0008] Optionally, the total demand current and the total demand voltage required for charging the power battery are obtained, comprising: obtaining battery state information of the power battery; determining the total demand current and the total demand voltage according to the battery state information; and wherein the battery state information comprises at least part of a battery coolant temperature, an average battery temperature, a battery health degree, a limit current of a charging device of the vehicle, an actual state of charge of the battery, and a charging state point at a specific state of charge at the end of charging.

[0009] Optionally, the charging capability of the charging pile comprises a maximum output power and an actual output power of the charging pile; and the charging demand of the at least two charging interfaces is determined according to the charging capability of the charging pile, comprising: the demand current of the at least two charging interfaces is determined according to the maximum output power; the actual output power of the charging pile is obtained during the process of charging the power battery by the charging pile; and the demand current of the at least two charging interfaces is adjusted according to the actual output power of the charging pile.

[0010] Optionally, the at least two charging interfaces include a first charging interface and a second charging interface, the first charging interface is connected with the first charging pile, and the second charging interface is connected with the second charging pile; the required current of each charging interface is adjusted according to the actual output power of the charging pile, including: in the case that the required power of the first charging interface is greater than the actual output power of the first charging pile, and the required power of the second charging interface is less than the actual output power of the second charging pile, the required current of the first charging interface and the required current of the second charging interface are adjusted; the required power is the product of the required current and the required voltage of the charging interface.

[0011] Optionally, the required current of the first charging interface and the required current of the second charging interface are adjusted, including: the required current of the first charging interface is reduced to make the required power of the first charging interface equal to the actual output power of the first charging pile.

[0012] Optionally, the required current of the first charging interface and the required current of the second charging interface are adjusted, including: the maximum output current corresponding to the maximum output power of the second charging pile is obtained; the difference between the total required current and the required current of the first charging interface is obtained; the required current of the second charging interface is adjusted to be the smaller value between the maximum output current and the difference.

[0013] Optionally, the charging method further includes: after one of the plurality of charging interfaces establishes communication with the charging pile, the charging pile is controlled according to the demand of the power battery to charge the power battery through the charging interface; during the charging of the charging interface, if other at least one charging interface starts to establish communication with the charging pile, the charging capability of the charging pile is obtained after the communication is established.

[0014] The application provides a charging method of a vehicle, the vehicle including a power battery, a battery management system, a first charging interface and a second charging interface, the first charging interface and the second charging interface being connected with the power battery through independent charging lines, and the first charging interface and the second charging interface being connected with the battery management system through independent communication buses; the first charging interface and the second charging interface are used to connect with the charging gun of one or two charging piles; the charging method includes: after the first charging interface and the second charging interface both establish communication with the charging pile, the charging capability of the charging pile is obtained; according to the charging capability of the charging pile, the charging demand of the first charging interface and the second charging interface is determined; according to the charging demand of the first charging interface and the second charging interface, the charging pile is controlled to output the charging demand of the corresponding connected first charging interface or second charging interface through the charging gun to charge the power battery.

[0015] The application provides a vehicle, comprising: a power battery; a battery management system electrically connected with the power battery; a plurality of charging interfaces, each charging interface being connected with the power battery through an independent charging line and each charging interface being connected with the battery management system through a power communication bus; the plurality of charging interfaces being used for connecting with charging guns of one or more charging piles; and one or more processors used for implementing a charging method of the vehicle.

[0016] The application provides a charging method of a vehicle and the vehicle. In a case where at least two charging interfaces in a plurality of charging interfaces of the vehicle establish communication with a charging pile, the charging demand of each charging interface in communication with the charging pile is determined according to the charging capacity of the charging pile that has established communication at present. The charging gun is controlled to charge each charging interface in communication with the charging pile according to the charging demand, so as to meet the charging demand of each charging interface and realize charging of the power battery. In this way, in the process of charging the vehicle through the plurality of charging interfaces, the charging control of each charging interface can be realized according to the actual charging capacity of the charging pile in communication with the charging interface of the vehicle, which is beneficial to realizing more accurate charging demand allocation among the plurality of charging interfaces, thereby improving the control accuracy of the vehicle charging process. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic diagram of an architecture of a vehicle provided by an embodiment of the application;

[0018] Figure 2 is a schematic diagram of a charging method of a vehicle provided by an embodiment of the application;

[0019] Figure 3 is a schematic diagram of a charging method of a vehicle provided by another embodiment of the application;

[0020] Figure 4 is a schematic diagram of a charging method of a vehicle provided by another embodiment of the application;

[0021] Figure 5 is a schematic diagram of a charging method of a vehicle provided by another embodiment of the application;

[0022] Figure 6 is a schematic diagram of a charging method of a vehicle provided by another embodiment of the application;

[0023] Figure 7 is a schematic diagram of a charging method of a vehicle provided by another embodiment of the application.

[0024] REFERENCE SIGNS

[0025] 10: power battery; 20: battery management system; 31: first charging interface; 32: second charging interface; 40: processor. DETAILED DESCRIPTION

[0026] The exemplary embodiments will be described in detail below with reference to the accompanying drawings.

[0027] In conjunction Figure 1 As shown, the application provides a vehicle, comprising a power battery 10, a battery management system 20, a plurality of charging interfaces and a processor 40. Each charging interface is connected to the power battery 10 through an independent charging line, and each charging interface is connected to the battery management system 20 through an independent communication bus. The battery management system 20 is electrically connected to the power battery 10; the plurality of charging interfaces are used to connect to the charging gun of one or more charging piles. The processor 40 is electrically connected to the power battery 10, the battery management system 20 and the plurality of charging interfaces, and the processor 40 is used to execute the charging method of the vehicle.

[0028] Exemplarily, in some embodiments, the vehicle comprises a first charging interface 31 and a second charging interface 32. Specifically, the first charging interface 31 and the second charging interface 32 are connected to the power battery 10 through independent charging lines, and the first charging interface 31 and the second charging interface 32 are connected to the battery management system 20 through independent communication buses. The first charging interface 31 and the second charging interface 32 are used to connect to the charging gun of one or two charging piles.

[0029] In conjunction Figure 2 As shown, the application provides a vehicle, comprising a power battery 10, a battery management system 20, a plurality of charging interfaces and a processor 40. Each charging interface is connected to the power battery 10 through an independent charging line, and each charging interface is connected to the battery management system 20 through an independent communication bus. The battery management system 20 is electrically connected to the power battery 10; the plurality of charging interfaces are used to connect to the charging gun of one or more charging piles. The processor 40 is electrically connected to the power battery 10, the battery management system 20 and the plurality of charging interfaces, and the processor 40 is used to execute the charging method of the vehicle.

[0030] Step S11, after at least two charging interfaces in the plurality of charging interfaces establish communication with the charging pile, the charging capacity of the charging pile is obtained.

[0031] Step S12, according to the charging capacity of the charging pile, the charging demand of each of the at least two charging interfaces is determined.

[0032] The charging demand includes the demand current and the demand voltage.

[0033] Step S13, according to the charging demand of each of the at least two charging interfaces, the charging pile is controlled to output the charging demand of the corresponding connected charging interface through the charging gun to charge the power battery.

[0034] The charging method of the vehicle provided in the embodiment of the present application is used in the case where at least two charging interfaces of the vehicle establish communication with the charging pile, and the charging demand of each charging interface in communication with the charging pile is determined according to the charging capacity of the charging pile that has established communication at present. The charging gun is controlled to charge each charging interface in communication with the charging pile according to the charging demand, so as to meet the charging demand of each charging interface and realize the charging of the power battery. In this way, in the process of charging the vehicle through multiple charging interfaces, the charging control of each charging interface can be realized according to the actual charging capacity of the charging pile in communication with the charging interface of the vehicle, which is beneficial to realizing more accurate charging demand allocation among multiple charging interfaces, thereby improving the control accuracy of the vehicle charging process.

[0035] Since the communication and charging of each charging interface can be independently controlled, the charging parameters of each charging interface do not need to be consistent, and independent on-off control can be realized, which is beneficial to improving the control flexibility of the multiple charging interface charging process.

[0036] For step S11, it should be noted that in the implementation process, the connection between the charging interface and the charging pile needs to be monitored to identify the case where at least two charging interfaces of the multiple charging interfaces establish communication with the charging pile in time. Further, in some embodiments, the charging method of the vehicle further includes: after one charging interface of the multiple charging interfaces establishes communication with the charging pile, the charging pile is controlled according to the demand of the power battery to charge the power battery through the charging interface. At this time, it is the ordinary charging process through a single charging interface. During the charging process of the charging interface, if other at least one charging interface starts to establish communication with the charging pile, after the communication is established, the charging capacity of the charging pile is obtained as mentioned above, and the subsequent charging method of the vehicle is further executed. That is, the monitoring of the connection between the charging interface and the charging pile is not one-time, and the number of charging interfaces in communication with the charging pile changes, that is, the plug-in of the charging gun changes, and the charging method of the vehicle also changes to ensure the accuracy of the charging process.

[0037] Here, the monitoring process of the vehicle including the first charging interface and the second charging interface is described. Figure 3 The monitoring process includes steps S101 to S109.

[0038] Step S101, the charging hard line is activated or the communication bus wakes up the battery management system.

[0039] Step S102, the battery management system starts working.

[0040] Step S103, it is judged whether the first charging interface establishes communication with the charging pile.

[0041] If yes, step S104 is performed; if no, step S107 is performed.

[0042] Step S104, determine whether the second charging interface and the charging pile establish communication.

[0043] If yes, step S105 is performed; if no, step S106 is performed.

[0044] Step S105, determine that both charging interfaces establish communication with the charging pile.

[0045] Corresponding to identifying and determining as the multi-gun charging mode.

[0046] Step S106, determine that the first charging interface establishes communication with the charging pile.

[0047] Corresponding to identifying and determining as the single-gun charging mode, and the first charging interface is to be charged. Step S107, determine whether the second charging interface and the charging pile establish communication.

[0048] If yes, step S108 is performed; if no, step S102 is continued to be performed.

[0049] Step S108, determine that the second charging interface establishes communication with the charging pile.

[0050] Corresponding to identifying and determining as the single-gun charging mode, and the second charging interface is to be charged.

[0051] Step S109, perform corresponding charging process according to the communication between the charging interface and the charging pile.

[0052] Here, corresponding to steps S11 to S13, the case that the vehicle includes the aforementioned first charging interface and the second charging interface is described. In combination with Figure 4 The application embodiment provides another charging method of the vehicle, including steps S21 to S23.

[0053] Step S21, after the first charging interface and the second charging interface establish communication with the charging pile, obtain the charging capacity of the charging pile.

[0054] Step S22, according to the charging capacity of the charging pile, determine the charging demand of the first charging interface and the second charging interface.

[0055] Step S23, according to the charging demand of the first charging interface and the second charging interface, control the charging pile to output the charging demand of the corresponding connected first charging interface or second charging interface through the charging gun, to charge the power battery.

[0056] For example, the first charging interface is connected with the first charging gun of the first charging pile, and the second charging interface is connected with the second charging gun of the second charging pile. Here, after determining the charging demands of the first charging interface and the second charging interface, the first charging pile is controlled to supply power to the first charging interface through the first charging gun to meet the charging demand of the first charging interface, and the second charging pile is controlled to supply power to the second charging interface through the second charging gun to meet the charging demand of the second charging interface.

[0057] Further, in combination with Figure 5 As shown in the figure, according to the charging capacity of the charging pile, the charging demands of the at least two charging interfaces are determined, including steps S121 and S122.

[0058] In step S121, the total demand current and the total demand voltage required for charging the power battery are obtained, and the total demand voltage is taken as the demand voltage of each of the at least two charging interfaces.

[0059] In step S122, the total demand current is distributed according to the charging capacity of the charging pile to determine the demand current of each of the at least two charging interfaces.

[0060] That is, the total demand current and the total demand voltage required for charging the power battery are obtained first. Since each charging interface is in an independent control parallel relationship, the total demand voltage is determined as the demand voltage of each charging interface that has established a connection with the charging pile, which can ensure that the voltages among the charging interfaces remain consistent. Further, the total demand current is distributed according to the charging capacity of the charging pile, which is conducive to ensuring that, after distribution, the demand current of each charging interface is adapted to the charging capacity of the charging pile connected with the charging interface, and that, after addition, the total demand current is met, which is conducive to realizing the accuracy of vehicle charging process control in the case of multiple charging interface charging guns.

[0061] In some embodiments, the total demand current and the total demand voltage required for charging the power battery can be preset values of the vehicle itself or manually inputted and determined by the user. In this way, the actual charging demand of the vehicle can be determined concisely and accurately to ensure that the charging process accurately meets the actual demand of the vehicle.

[0062] In some embodiments, the aforementioned obtaining the total required current and the total required voltage for charging the power battery includes: obtaining battery state information of the power battery; and determining the total required current and the total required voltage according to the battery state information. The battery state information includes at least one of a battery coolant temperature, an average battery temperature, a battery health degree, a limited current of a charging device of the vehicle, an actual state of charge of the battery, and a state of charge point at a specific state of charge at the end of charging. In this way, the accuracy of the total required current and the total required voltage during charging is ensured, and the process is automatically performed without manual input by the user, which helps to optimize the user experience. Specifically, a corresponding relationship between the battery state information and the total required current and the total required voltage for charging is determined in advance and stored, and in the implementation process, the actual battery state information of the power battery when the vehicle needs to be charged is combined with the corresponding relationship to determine the current total required current and the total required voltage. In some embodiments, the corresponding relationship between the battery state information and the total required current and the total required voltage can be saved in the form of a corresponding relationship table, so that the total required current and the total required voltage required for current charging can be quickly determined by table lookup during charging. In other embodiments, the corresponding relationship between the battery state information and the total required current and the total required voltage can also be saved in the form of a relationship formula. The current total charging current and the total charging voltage required for current charging can be determined according to the current battery state information and the formula during charging.

[0063] Correspondingly, in some embodiments, when the charging interface includes the first charging interface and the second charging interface, the determining of the charging requirements of the first charging interface and the second charging interface according to the charging capacity of the charging pile includes: obtaining the total required current and the total required voltage for charging the power battery, the total required voltage serving as the required voltage of the first charging interface and the required voltage of the second charging interface. The total required current is allocated according to the charging capacity of the charging pile to determine the required current of the first charging interface and the required current of the second charging interface.

[0064] In some embodiments, the charging capability of the charging pile includes a maximum output power of the charging pile. The at least two charging interfaces are connected to a plurality of charging piles. According to the charging capability of the charging pile, the total demand current is allocated to determine the demand current of each charging interface connected to the charging pile, including: in a case that the maximum output power of the charging pile can independently satisfy the total demand current and the total demand voltage, the total demand current is equally divided as the demand current of each charging interface connected to the charging pile. In a case that the maximum output power of at least one of the plurality of charging piles cannot independently satisfy the total demand current and the total demand voltage, the total demand current is allocated according to the difference between the maximum output powers of the plurality of charging piles. In a case that the plurality of charging piles connected to the vehicle can independently satisfy the current total demand voltage and total demand current, the plurality of charging piles are used to charge the power battery at the same time, which is beneficial to reduce the load of a single charging pile, reduce the damage risk of the charging pile, and improve the safety of the charging process. At the same time, a more stable charging curve can be realized, the current fluctuation during charging is avoided, the damage to the power battery is reduced, and thus the power battery protection is realized. If the maximum output power of at least one charging pile cannot independently satisfy the total demand current and the total demand voltage, the total demand current needs to be further allocated according to the difference between the maximum output powers of the charging piles to improve the accuracy of the charging control.

[0065] In addition, in a case that the at least two charging interfaces are connected to the same charging pile, the charging method further includes: the total demand current is equally divided as the demand current of each charging interface connected to the charging pile. In this way, the current required by each interface can be ensured to run within the load range of the charging pile, so as to avoid overloading of the charging pile due to too large current of a single interface, and thus the stability and safety of the charging pile are improved. Correspondingly, in some embodiments, in a case that the charging interface includes a first charging interface and a second charging interface, according to the charging capability of the charging pile, the total demand current is allocated to determine the demand current of the first charging interface and the second charging interface, including: in a case that the maximum output power of the charging pile can independently satisfy the total demand current and the total demand voltage, the total demand current is equally divided as the demand current of the first charging interface and the demand current of the second charging interface. In a case that the maximum output power of at least one charging pile cannot independently satisfy the total demand current and the total demand voltage, the total demand current is allocated according to the difference between the maximum output powers of the charging piles.

[0066] In some embodiments, the total demand current is allocated according to the difference between the maximum output powers of the charging piles connected by the respective charging interfaces, to determine the demand current of each charging interface connected with the charging pile, including: in the case that the difference is less than or equal to a difference threshold, the total demand current is equally allocated. In the case that the difference is greater than the difference threshold, the total demand current is sequentially allocated to at least two charging interfaces in the order of the maximum output powers of the charging piles from small to large, until the demand current and demand voltage of the charging interface reaches the maximum output power of the charging pile connected with the charging interface, or the sum of the allocated demand currents reaches the total demand current.

[0067] Here, in some embodiments, the difference threshold is a pre-set fixed value. In some embodiments, the difference threshold is determined according to the maximum output power of the charging pile. For example, first determine the one with the largest maximum output power in the charging piles, and set the difference threshold as a certain proportion of the maximum output power. For example, set the difference threshold as 20% of the maximum output power.

[0068] In the case that the difference is less than or equal to the difference threshold, the total demand current is equally allocated. That is, in the case that the charging capabilities of the charging piles are similar, the respective charging piles are charged with the same demand current, which is beneficial to reduce the difference in demand current between the charging interfaces, avoid uneven charging leading to uneven temperature of the power battery, accelerate the aging of the power battery, and further affect the overall life and performance of the battery.

[0069] In the case that the difference is greater than the difference threshold, the total demand current is further allocated. Specifically, the charging interfaces are sorted in the order of the maximum output powers of the connected charging piles from small to large, and the demand current is sequentially determined. In the process of allocation, the product of the demand current and demand voltage of the charging interface with the smaller maximum output power of the connected charging pile reaches the maximum output power. The demand current of the charging interface with the larger maximum output power of the connected charging pile compensates for the remaining part of the total demand current. In this way, in the case that the final allocation result satisfies the total output current, it is beneficial to make the demand currents of the respective charging interfaces as close as possible, and beneficial to reduce the difference in demand current between the charging interfaces, avoid uneven charging leading to uneven temperature of the power battery, accelerate the aging of the power battery, and further affect the overall life and performance of the power battery.

[0070] Correspondingly, in some embodiments, when the charging interface includes the first charging interface and the second charging interface, the total demand current is allocated according to the difference between the maximum output powers of the charging piles, including: in the case that the difference is less than or equal to a difference threshold, the total demand current is equally divided as the demand current of the first charging interface and the second charging interface respectively; in the case that the difference is greater than a set threshold, the current corresponding to the maximum output power of the charging pile with smaller maximum output power is taken as the demand current of the charging interface connected with the charging pile; the difference between the total demand current and the current corresponding to the maximum output power of the charging pile with smaller maximum output power is taken as the demand current of the other charging interface. Here, the current corresponding to the maximum output power is the quotient obtained by dividing the maximum output power by the demand voltage.

[0071] Exemplarily, the first charging interface is connected with the first charging pile, and the second charging interface is connected with the second charging pile. If the difference between the maximum output power of the first charging pile and the maximum output power of the second charging pile is greater than a set threshold, the size relationship between the maximum output power of the first charging pile and the maximum output power of the second charging pile is determined. If the maximum output power of the first charging pile is smaller than the maximum output power of the second charging pile, the demand current of the first charging interface is determined as the quotient obtained by dividing the maximum output power of the first charging pile by the demand voltage of the first charging pile. It is further determined that the demand current of the second charging interface is the total demand current minus the demand current of the first charging interface. In this way, in the case that the charging capacity of the charging pile charging the first charging interface and the second charging interface is uneven, the demand currents of the first charging interface and the second charging interface are as close as possible, so as to avoid the temperature unevenness of the power battery caused by uneven charging, accelerate the aging of the power battery, and further affect the overall life and performance of the power battery.

[0072] In some embodiments, the charging capacity of the charging pile includes the maximum output power and the actual output power of the charging pile. In combination with Figure 6 As shown, according to the charging capacity of the charging pile, the charging demand of the at least two charging interfaces is determined, including steps S1201 to S1203.

[0073] In step S1201, the demand current of the at least two charging interfaces is determined according to the maximum output power.

[0074] Here, the specific process can be performed according to the foregoing steps S121 and S122, and will not be described again.

[0075] In step S1202, during the process of charging the power battery by the charging pile, the actual output power of the charging pile is obtained.

[0076] In step S1203, the demand current of the at least two charging interfaces is adjusted according to the actual output power of the charging pile.

[0077] Considering that during implementation, situations may arise where the charging pile is connected to other vehicles, leading to a significant difference between the actual output power and the maximum output power of the charging pile, the current required by the charging interface will be further adjusted based on the actual output power of the charging pile during the charging process to the power battery. This will enable adaptive adjustments to the charging process, improve the accuracy of charging control, and ultimately enhance charging efficiency.

[0078] In some embodiments, at least two charging interfaces include a first charging interface and a second charging interface. When the first charging interface is connected to a first charging pile and the second charging interface is connected to a second charging pile, the required current of each charging interface is adjusted according to the actual output power of the charging pile. This includes adjusting the required current of the first charging interface and the required current of the second charging interface when the required power of the first charging interface is greater than the actual output power of the first charging pile, and the required power of the second charging interface is less than the actual output power of the second charging pile. The required power is the product of the required current and the required voltage of the charging interface. This way, the required current is adjusted only when the required power distribution of each charging interface is uneven, which helps avoid unnecessary adjustment processes.

[0079] Specifically, in some embodiments, adjusting the required current of the first charging interface and the required current of the second charging interface includes reducing the required current of the first charging interface so that the required power of the first charging interface is equal to the actual output power of the first charging pile. This helps prevent overload of the charging pile, facilitates a smoother charging process, and reduces the risk of damage to the power battery.

[0080] In some embodiments, adjusting the demand current of the first charging interface and the demand current of the second charging interface includes: obtaining the maximum output current corresponding to the maximum output power of the second charging pile; obtaining the difference between the total demand current and the demand current of the first charging interface; and adjusting the demand current of the second charging interface to the smaller value between the maximum output current and the difference. This helps to optimize current distribution, reduce energy waste, and improve charging efficiency. Simultaneously, it effectively balances the load on the charging pile, avoids overload problems, and ensures that the charging equipment operates efficiently within a safe range. This improves the user's charging experience, avoids the risk of prolonged charging time or damage to the power battery, and also helps to extend the service life of the charging pile.

[0081] When charging is initiated by connecting the charging gun to the charging interface of a charging station, since each charging interface is independent, the initiation process is also independent when multiple charging interfaces are connected to the charging gun. Taking the example of both the first and second charging interfaces being connected to the charging station, we will combine... Figure 7 The specific charging process includes the following steps.

[0082] Step S300, start.

[0083] Step S311, close the insulation between the first charging interface and the power battery.

[0084] The insulation between the first charging interface and the power battery is closed immediately after detecting that the charging pile communicates with the first charging interface. Specifically, in some embodiments, the insulation between the first charging interface and the power battery is closed immediately after detecting CC2 (Charge Controller 2). CC2 is used to manage the communication between the battery management system and the charging pile during the charging process as part of the vehicle charging system.

[0085] After the insulation is closed, the electrical connection between the first charging interface and the power battery has been normally connected to proceed with the subsequent charging process.

[0086] Here, it is pointed out that after the insulation is closed, the insulation value at the moment before closing is sent until the insulation is reopened. In this way, it can be avoided that the system misjudges the subsequent process as an insulation fault and issues related alarms or other measures to deal with insulation faults.

[0087] Step S312, sequentially send and receive CHM (Charging Request Message), BHM (Battery Health Message), CRM (Charging Resource Message), BRM (Battery Resource Message), etc.

[0088] The charging pile and the battery management system transmit charging-related control information by sending and receiving messages to establish communication.

[0089] Step S313, determine the connection state between the first charging interface and the charging pile. To confirm whether the next step operation can be continued.

[0090] Step S314, close the fast charging relay between the battery management system and the first charging interface.

[0091] The fast charging relay is closed to allow the charging pile to perform fast charging on the first charging interface.

[0092] Step S315, start insulation detection.

[0093] Here is the safety detection process before charging. The insulation detection is used to ensure that the electrical insulation state of the charging system is normal. If any electrical fault is detected, the charging will be suspended or stopped to avoid safety risks.

[0094] Step S316, BCP (Battery Charging Process Message), BRO (Battery Charging Request), CRO (Charging Recovery Request), BCL (Battery Charging Limit), BCS (Battery Charging Status) and other messages are sent and received in sequence.

[0095] The communication continues to be performed, and the charging pile and the battery management system continue to exchange information such as charging status, charging power, and protection status through messages, to ensure real-time and accurate communication during the charging process.

[0096] In addition, after step S311, step S317 also needs to be performed.

[0097] Step S317, within the set time after the insulation between the charging interface and the power battery is closed, if the charging pile connected with the first charging interface does not establish an electrical connection, the insulation between the first charging interface and the power battery is restored and the charging is exited.

[0098] If the first charging interface and the charging pile are still not powered on within the set time, it means that the charging pile has not been started or has failed. At this time, in order to avoid the risk of keeping the first charging interface and the power battery in a non-insulated state all the time in the case of no charging, the insulation between the first charging interface and the power battery is restored, and the charging process between the charging pile and the first charging interface is closed.

[0099] Step S321, the insulation between the second charging interface and the power battery is closed.

[0100] The insulation between the second charging interface and the power battery is closed immediately after detecting the communication between the charging pile and the second charging interface. Specifically, in some embodiments, if CC2 (Charge Controller 2) is detected, the insulation between the second charging interface and the power battery is closed immediately. CC2 is part of the vehicle charging system and is used to manage communication between the battery management system and the charging pile during the charging process.

[0101] After the insulation is closed, the electrical connection between the second charging interface and the power battery is normally connected, so as to proceed with the subsequent charging process.

[0102] Here, it is to be noted that after the insulation is closed, the insulation value at the moment before closing is sent until the insulation is reopened. In this way, the system can avoid misjudging the subsequent process as an insulation fault and issuing relevant alarms or other measures to deal with insulation faults.

[0103] Step S322, CHM (Charging Request Message), BHM (Battery Health Message), CRM (Charging Resource Message), BRM (Battery Resource Message) and other messages are sent and received in turn.

[0104] The charging pile and the battery management system transmit charging-related control information by sending and receiving messages to establish communication.

[0105] Step S323, connection state judgment between the second charging interface and the charging pile. To confirm whether the next operation can continue.

[0106] Step S324, close the fast charging relay between the battery management system and the second charging interface.

[0107] The fast charging relay is closed to allow the charging pile to perform fast charging on the second charging interface.

[0108] Step S325, start insulation detection.

[0109] Here is the safety detection process before charging. Insulation detection is used to ensure that the electrical insulation state of the charging system is normal. If any electrical fault is detected, the charging will be suspended or stopped to avoid safety risks.

[0110] Step S326, BCP (Battery Charging Process Message), BRO (Battery Charging Request), CRO (Charging Recovery Request), BCL (Battery Charging Limit), BCS (Battery Charging Status) and other messages are sent and received in turn.

[0111] The communication continues to execute, and the charging pile and the battery management system continue to exchange charging state, charging power, protection state and other information through messages to ensure real-time and accurate communication during the charging process.

[0112] In addition, after step S321, step S327 is further performed.

[0113] In step S327, if the second charging interface is not electrically connected with the charging pile within the set time after the insulation between the charging interface and the power battery is closed, the insulation between the second charging interface and the power battery is recovered and the charging is exited.

[0114] If the second charging interface is not electrically connected with the charging pile within the set time, it indicates that the charging pile is not started or is in failure. In order to avoid the safety risk caused by the non-insulation state between the second charging interface and the power battery in the case of no charging, the insulation between the second charging interface and the power battery is recovered and the charging process between the charging pile and the second charging interface is closed.

[0115] In the description of the present application, it should be understood that the terms "first", "second" and the like are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three and the like, unless otherwise specifically limited.

Claims

1. A charging method of a vehicle, characterized by, The vehicle comprises a power battery, a battery management system and a plurality of charging interfaces, each of the charging interfaces is connected to the power battery through an independent charging line, and each of the charging interfaces is connected to the battery management system through an independent communication bus, and the battery management system is connected to the power battery; The plurality of charging interfaces are used to connect to the charging guns of one or more charging piles; The charging method comprises: After at least two of the plurality of charging interfaces establish communication with the charging pile, the charging capacity of the charging pile is obtained; According to the charging capacity of the charging pile, the charging demand of each of the at least two charging interfaces is determined; According to the charging demand of each of the at least two charging interfaces, the charging pile is controlled to output the charging demand of the corresponding connected charging interface through the charging gun to charge the power battery; The determination of the charging demand of the at least two charging interfaces according to the charging capacity of the charging pile comprises: The total demand current and total demand voltage required for charging the power battery are obtained, and the total demand voltage is used as the demand voltage of each of the at least two charging interfaces; According to the charging capacity of the charging pile, the total demand current is distributed to determine the demand current of each of the at least two charging interfaces; The charging capacity of the charging pile comprises the maximum output power of the charging pile; In the case that the at least two charging interfaces are connected to a plurality of charging piles, the distribution of the total demand current according to the charging capacity of the charging pile to determine the demand current of each of the charging interfaces connected to the charging pile comprises: In the case that the maximum output power of the charging pile can independently satisfy the total demand current and the total demand voltage, the total demand current is equally distributed as the demand current of each of the charging interfaces connected to the charging pile; In the case that the maximum output power of at least one of the plurality of charging piles cannot independently satisfy the total demand current and the total demand voltage, the total demand current is distributed according to the difference between the maximum output powers of the plurality of charging piles.

2. The charging method according to claim 1, characterized by, The distribution of the total demand current according to the difference between the maximum output powers of the charging piles connected to each of the charging interfaces to determine the demand current of each of the charging interfaces connected to the charging pile comprises: In the case that the difference is less than or equal to a difference threshold, the total demand current is equally distributed; In the case that the difference is greater than the difference threshold, the total demand current is sequentially distributed to the at least two charging interfaces in the order of the maximum output powers of the plurality of charging piles from small to large, until the demand current and demand voltage of the charging interface reach the maximum output power of the charging pile connected to the charging interface, or the total sum of the distributed demand current reaches the total demand current.

3. The charging method according to claim 1, characterized by, The obtaining of the total demand current and total demand voltage required for charging the power battery comprises: Obtaining battery state information of the power battery; According to the battery state information, the total demand current and the total demand voltage are determined; The battery state information includes at least one of a battery coolant temperature, an average battery temperature, a battery health degree, a limited current of a charging device of the vehicle, an actual battery charging state, and a charging state point at a specific state of charge at the end of charging.

4. The charging method according to claim 1, characterized by, The charging capability of the charging pile includes a maximum output power and an actual output power of the charging pile. The determining of the charging demand of the at least two charging interfaces according to the charging capability of the charging pile includes: determining a demand current of the at least two charging interfaces according to the maximum output power; obtaining the actual output power of the charging pile during the charging of the power battery by the charging pile; adjusting the demand current of the at least two charging interfaces according to the actual output power of the charging pile.

5. The charging method according to claim 4, characterized by, The at least two charging interfaces include a first charging interface and a second charging interface, the first charging interface is connected with a first charging pile, and the second charging interface is connected with a second charging pile; the adjusting of the demand current of each charging interface according to the actual output power of the charging pile includes: adjusting the demand current of the first charging interface and the demand current of the second charging interface when the demand power of the first charging interface is greater than the actual output power of the first charging pile and the demand power of the second charging interface is less than the actual output power of the second charging pile; the demand power is the product of the demand current and a demand voltage of the charging interface.

6. The charging method according to claim 5, characterized by, The adjusting of the demand current of the first charging interface and the demand current of the second charging interface includes: reducing the demand current of the first charging interface so that the demand power of the first charging interface is equal to the actual output power of the first charging pile.

7. The charging method according to claim 6, characterized by, The adjusting of the demand current of the first charging interface and the demand current of the second charging interface includes: obtaining a maximum output current corresponding to the maximum output power of the second charging pile; obtaining a difference between the total demand current and the demand current of the first charging interface; adjusting the demand current of the second charging interface to be the smaller one of the maximum output current and the difference.

8. The charging method according to claim 1, characterized by, Further including: controlling the charging pile according to the demand of the power battery to charge the power battery through one charging interface in the plurality of charging interfaces after the charging interface establishes communication with the charging pile; if at least one other charging interface establishes communication with the charging pile during the charging of the charging interface, obtaining the charging capability of the charging pile after the communication is established.

9. A charging method of a vehicle characterized by, The vehicle includes a power battery, a battery management system, a first charging interface, and a second charging interface, the first charging interface and the second charging interface are connected with the power battery through independent charging lines, and the first charging interface and the second charging interface are connected with the battery management system through independent communication buses; the first charging interface and the second charging interface are used to connect with a charging gun of one or two charging piles; The charging method includes: obtaining the charging capability of the charging pile after the first charging interface and the second charging interface both establish communication with the charging pile. determining charging demands of the first charging interface and the second charging interface according to a charging capability of the charging pile; controlling the charging pile to output the charging demands of the first charging interface or the second charging interface corresponding to the connected charging gun according to the charging demands of the first charging interface and the second charging interface, so as to charge the power battery; the determining of the charging demands of the first charging interface and the second charging interface according to the charging capability of the charging pile comprises: obtaining a total demand current and a total demand voltage required by the power battery for charging, the total demand voltage serving as a demand voltage of the first charging interface and a demand voltage of the second charging interface; allocating the total demand current according to the charging capability of the charging pile to determine a demand current of the first charging interface and a demand current of the second charging interface; wherein the charging capability of the charging pile comprises a maximum output power of the charging pile; in the case that the first charging interface and the second charging interface are connected to different charging piles, the allocating of the total demand current according to the charging capability of the charging pile to determine the demand current of the first charging interface and the demand current of the second charging interface comprises: in the case that the maximum output powers of the charging piles can both independently satisfy the total demand current and the total demand voltage, the total demand current is equally divided as the demand current of the first charging interface and the demand current of the second charging interface; in the case that the maximum output power of at least one charging pile cannot independently satisfy the total demand current and the total demand voltage, the total demand current is allocated according to the difference between the maximum output powers of the charging piles.

10. A vehicle characterized by comprising: comprise: a power battery; a battery management system electrically connected to the power battery; a plurality of charging interfaces, each of the charging interfaces being connected to the power battery through an independent charging line and connected to the battery management system through a power communication bus, and the plurality of charging interfaces being used to connect to charging guns of one or more charging piles; one or more processors configured to implement the charging method of the vehicle according to any one of claims 1 to 9.

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