Charging method of vehicle and vehicle

Abstract

The invention provides a vehicle charging method and a vehicle, the vehicle comprises a power battery, a battery management system and a plurality of charging interfaces, each charging interface is connected with the power battery through an independent charging circuit, each charging interface is connected with the battery management system through an independent communication bus, and the battery management system is connected with the power battery; the plurality of charging interfaces are used for being connected with charging guns of one or more charging piles. The charging method comprises the steps that after at least two charging interfaces in the multiple charging interfaces establish communication with the charging pile, the charging capacity of the charging pile is obtained. And according to the charging capability of the charging pile, determining respective charging requirements of the at least two charging interfaces. And according to the respective charging requirements of the at least two charging interfaces, the charging pile is controlled to output the charging requirements of the correspondingly connected charging interfaces through the charging gun so as to charge the power battery. And more accurate charging demand distribution among the multiple charging interfaces can be realized, so that the control accuracy of the vehicle charging process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and particularly to a charging method for a vehicle and a vehicle. Background Art

[0002] With the gradual popularization of new energy vehicles, the charging demand for the power batteries in new energy vehicles has increased accordingly. Especially in scenarios where the number of vehicles to be charged is large and the battery capacity of the vehicle power battery is large, the demand for improving the charging efficiency to save the charging time is particularly significant. To improve the charging efficiency of the vehicle and shorten the charging time of a single vehicle, in related technologies, the vehicle is provided with two charging interfaces, allowing two charging guns to charge the power battery of the vehicle simultaneously. However, in related technologies, the two charging interfaces often share the same charging process and need to start and stop the charging process simultaneously, with low control flexibility. Under this limitation, the control accuracy of the charging process needs to be improved. Summary of the Invention

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

[0004] The present application provides a charging method for a vehicle. The vehicle includes 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 connect to the charging guns of one or more charging piles; the charging method includes: after at least two of the plurality of charging interfaces establish communication with the charging pile, obtaining the charging capacity of the charging pile; determining the charging requirements of at least two charging interfaces respectively according to the charging capacity of the charging pile; and controlling the charging pile to output the charging requirements of the correspondingly connected charging interfaces through the charging guns to charge the power battery according to the charging requirements of at least two charging interfaces respectively.

[0005] Optionally, determining the charging requirements of at least two charging interfaces according to the charging capacity of the charging pile includes: obtaining the total required current and total required voltage for charging the power battery, and using the total required voltage as the required voltage of at least two charging interfaces respectively; and distributing the total required current according to the charging capacity of the charging pile to determine the required current of at least two charging interfaces respectively.

[0006] Optionally, the charging capacity of the charging pile includes the maximum output power of the charging pile; at least two charging interfaces are connected to multiple charging piles; according to the charging capacity of the charging piles, the total demand current is allocated to determine the demand current of each charging interface connected to the charging piles, including: when the maximum output power of each charging pile can independently meet the total demand current and the total demand voltage, the total demand current is evenly divided as the demand current of each charging interface connected to the charging piles; when the maximum output power of at least one of the multiple charging piles cannot independently meet 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 multiple charging piles.

[0007] Optionally, according to the difference between the maximum output powers of the charging piles connected to each charging interface, the total demand current is allocated to determine the demand current of each charging interface connected to the charging piles, including: when the difference is less than or equal to the difference threshold, the total demand current is evenly divided; when the difference is greater than the difference threshold, the total demand current is sequentially allocated to at least two charging interfaces in ascending order of the maximum output powers of the multiple 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 sum of the allocated demand currents reaches the total demand current.

[0008] Optionally, obtaining the total demand current and the total demand voltage required for charging the power battery includes: obtaining the battery state information of the power battery; determining the total demand current and the total demand voltage according to the battery state information; wherein, the battery state information includes at least some of the battery coolant temperature, the average battery temperature, the battery health, the limit current of the vehicle's charging device, the actual charging state of the battery, and the charging state point at a specific state of charge at the end of charging.

[0009] Optionally, the charging capacity of the charging pile includes the maximum output power and the actual output power of the charging pile; according to the charging capacity of the charging pile, determining the charging requirements of at least two charging interfaces includes: determining the demand current of at least two charging interfaces according to the maximum output power; during the charging process of the charging pile to the power battery, obtaining the actual output power of the charging pile; adjusting the demand current of at least two charging interfaces according to the actual output power of the charging pile.

[0010] Optionally, at least two charging interfaces include a first charging interface and a second charging interface. The first charging interface is connected to a first charging pile, and the second charging interface is connected to a second charging pile. Adjusting the required current of each charging interface according to the actual output power of the charging pile includes: 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, adjusting the required current of the first charging interface and the required current of the second charging interface. The required power is the product of the required current and the required voltage of the charging interface.

[0011] Optionally, 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.

[0012] Optionally, adjusting the required current of the first charging interface and the required 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 required current and the required current of the first charging interface; adjusting the required current of the second charging interface to the smaller value between the maximum output current and the difference.

[0013] Optionally, the charging method further includes: after one of the multiple charging interfaces establishes communication with the charging pile, controlling the charging pile according to the requirements of the power battery to charge the power battery through this charging interface; during the charging process of this charging interface, if at least one other charging interface starts to establish communication with the charging pile, after establishing communication, execute obtaining the charging capacity of the charging pile.

[0014] The present application provides a charging method for a vehicle. 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 to the power battery through independent charging lines, and the first charging interface and the second charging interface are connected to the battery management system through independent communication buses. The first charging interface and the second charging interface are used to connect to the charging guns of one or two charging piles. The charging method includes: after both the first charging interface and the second charging interface establish communication with the charging pile, obtaining the charging capacity of the charging pile; determining the charging requirements of the first charging interface and the second charging interface according to the charging capacity of the charging pile; controlling the charging pile to output the charging requirements corresponding to the connected first charging interface or second charging interface through the charging gun to charge the power battery.

[0015] The present application provides a vehicle, comprising: a power battery; a battery management system electrically connected to the power battery; 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 a power communication bus; the plurality of charging interfaces being used for connecting to charging guns of one or more charging piles; and one or more processors for implementing the charging method of the aforementioned vehicle.

[0016] For the charging method and vehicle provided by the present application, when at least two of the plurality of charging interfaces of the vehicle establish communication with a charging pile, the charging requirements of each charging interface communicating with the charging pile are determined according to the charging capacity of the currently established communication charging pile. And charging is controlled for each charging interface communicating with the charging pile according to the charging requirements to meet the charging requirements of each charging interface and achieve charging of the power battery. In this way, during the charging of the vehicle through multiple charging interfaces, charging control of each charging interface can be realized according to the actual charging capacity of the charging pile communicating with the charging interface of the vehicle, which is beneficial to more accurate distribution of charging requirements among multiple charging interfaces, thereby improving the control accuracy of the vehicle charging process. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

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

[0023] Figure 7 is a schematic diagram of the charging method of a vehicle provided by another embodiment of the present 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] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the accompanying drawings.

[0027] Combined Figure 1 As shown, the present application provides a vehicle, including 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 guns of one or more charging piles. One or more processors 40 are provided, which are 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 includes 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 guns of one or two charging piles.

[0029] Combined Figure 2 As shown, an embodiment of the present application provides a charging method for a vehicle, including steps S11 to S13.

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

[0031] Step S12, according to the charging capacity of the charging pile, determine the respective charging requirements of at least two charging interfaces.

[0032] The charging requirements include a required current and a required voltage.

[0033] Step S13, according to the respective charging requirements of at least two charging interfaces, control the charging pile to output the charging requirements corresponding to the connected charging interfaces through the charging gun to charge the power battery.

[0034] By using the vehicle charging method provided in the embodiments of the present application, when at least two of the multiple charging interfaces of the vehicle establish communication with a charging pile, the charging requirements of each charging interface communicating with the charging pile are determined according to the charging capacity of the currently established communication charging pile. And according to the charging requirements, the charging gun is controlled to charge each charging interface communicating with the charging pile to meet the charging requirements of each charging interface and achieve the charging of the power battery. In this way, during the charging process of 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 communicating with the charging interface of the vehicle, which is beneficial to more accurate charging requirement 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 kept consistent, and independent switch control can be realized, which is beneficial to improving the control flexibility of the charging process of multiple charging interfaces.

[0036] Regarding step S11, it should be noted that during the implementation process, it is necessary to monitor the connection status between the charging interface and the charging pile to timely identify the situation where at least two of the multiple charging interfaces establish communication with the charging pile. Further, in some embodiments, the vehicle charging method further includes: after one of the multiple charging interfaces establishes communication with the charging pile, controlling the charging pile according to the requirements of the power battery to charge the power battery through this charging interface. At this time, it is a normal charging process of charging through a single charging interface. During the charging process of this charging interface, if at least one other 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 described above, and the subsequent vehicle charging method is further executed. That is, the monitoring of the connection status between the charging interface and the charging pile is not a one-time operation. Following the change in the number of charging interfaces establishing communication connections with the charging pile, that is, the insertion and removal change of the charging gun, the vehicle charging method will also change to ensure the accuracy of the charging process.

[0037] Here, in combination with Figure 3 , the monitoring process in the case where the vehicle includes a first charging interface and a second charging interface is described. This monitoring process includes steps S101 to S109.

[0038] Step S101, the charging hard wire activates or the communication bus wakes up the battery management system.

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

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

[0041] If so, execute step S104; if not, execute step S107.

[0042] Step S104: Determine whether communication is established between the second charging interface and the charging pile.

[0043] If so, execute step S105. If not, execute step S106.

[0044] Step S105: Determine that communication is established between both charging interfaces and the charging pile.

[0045] This is equivalent to identifying and determining the multi-gun charging mode.

[0046] Step S106: Determine that communication is established between the first charging interface and the charging pile.

[0047] This is equivalent to identifying and determining the single-gun charging mode, and the first charging interface is to be charged. Step S107: Determine whether communication is established between the second charging interface and the charging pile.

[0048] If so, execute step S108; if not, continue to execute step S102.

[0049] Step S108: Determine that communication is established between the second charging interface and the charging pile.

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

[0051] Step S109: Execute the corresponding charging process according to the communication situation between the charging interface and the charging pile.

[0052] Here, corresponding to steps S11 to S13, the situation of the vehicle including the aforementioned first charging interface and second charging interface is described. Combining Figure 4 As shown, the embodiment of the present application provides another charging method for a vehicle, including steps S21 to S23.

[0053] Step S21: After communication is established between both the first charging interface and the second charging interface and the charging pile, obtain the charging capacity of the charging pile.

[0054] Step S22: Determine the charging requirements of the first charging interface and the second charging interface according to the charging capacity of the charging pile.

[0055] Step S23: According to the charging requirements of the first charging interface and the second charging interface, control the charging pile to output the charging requirements corresponding to the 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 to the first charging gun of the first charging pile, and the second charging interface is connected to the second charging gun of the second charging pile. After determining the charging requirements of the first charging interface and the second charging interface, the first charging pile is controlled so that the first charging pile supplies power to the first charging interface through the first charging gun to meet the charging requirements of the first charging interface; and the second charging pile is controlled so that the second charging pile supplies power to the second charging interface through the second charging gun to meet the charging requirements of the second charging interface.

[0057] Further, as shown in Figure 5 determining the charging requirements of at least two charging interfaces according to the charging capabilities of the charging piles includes step S121 and step S122.

[0058] Step S121: Obtain the total required current and total required voltage for charging the power battery, and use the total required voltage as the required voltage for each of the at least two charging interfaces.

[0059] Step S122: Allocate the total required current according to the charging capabilities of the charging piles to determine the required current for each of the at least two charging interfaces.

[0060] That is, first obtain the total required current and total required voltage for charging the power battery. Since each charging interface is in a parallel relationship with independent control, determining that the total required voltage is the required voltage of each charging interface that has been connected to the charging pile can ensure that the voltages between the charging interfaces are consistent. Further allocating the total required current according to the charging capabilities of the charging piles is beneficial to ensuring that after allocation, the required current of each charging interface is adapted to the charging capabilities of the charging pile connected to the charging interface, and the sum meets the total required current, which is beneficial to realizing the accuracy of vehicle charging process control in the case of multiple charging interface charging guns.

[0061] In some embodiments, the total required current and total required voltage for charging the power battery can be set values already existing in the vehicle itself, or determined by manual input of the user. In this way, the actual charging requirements of the vehicle can be determined simply and accurately to ensure that the charging process accurately meets the actual requirements of the vehicle.

[0062] In some embodiments, obtaining the total required current and total required voltage for charging a power battery includes: obtaining battery state information of the power battery; determining the total required current and total required voltage according to the battery state information. Among them, the battery state information includes at least some of the battery coolant temperature, average battery temperature, battery health, the limiting current of the vehicle's charging device, the actual charging state of the battery, and the charging state point at a specific state of charge at the end of charging. In this way, it is beneficial to ensure the accuracy of the total required current and total required voltage during the charging process, and this process is automatically performed without manual input by the user, which is beneficial to optimizing the user experience. Specifically, the corresponding relationship between the battery state information and the total required current and total required voltage for charging is determined in advance and stored. During the implementation process, according to the actual battery state information of the power battery when vehicle charging is required, the current total required current and total required voltage can be determined in combination with this corresponding relationship. In some embodiments, the corresponding relationship between the battery state information and the total required current and total required voltage can be saved in the form of a corresponding relationship table. In this way, the total required current and total required voltage for the current charging can be quickly determined by looking up the table during the charging process. In other embodiments, the corresponding relationship between the battery state information and the total required current and total required voltage can also be saved in the form of a relational formula. During the charging process, the total charging current and total charging voltage required for the current charging can be determined according to the current battery state information and this formula.

[0063] Correspondingly, in some embodiments, when the charging interface includes a first charging interface and a second charging interface, determining 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 total required voltage for charging the power battery, taking the total required voltage as the required voltage of the first charging interface and also as the required voltage of the second charging interface. According to the charging capacity of the charging pile, allocate the total required current to determine the required current of the first charging interface and the required current of the second interface.

[0064] In some embodiments, the charging capacity of the charging pile includes the maximum output power of the charging pile. At least two charging interfaces are connected to multiple charging piles. According to the charging capacity of the charging piles, the total demand current is allocated to determine the demand current of each charging interface connected to the charging piles, including: when the maximum output power of each charging pile can independently meet the total demand current and the total demand voltage, the total demand current is evenly divided as the demand current of each charging interface connected to the charging piles. When the maximum output power of at least one of the multiple charging piles cannot independently meet 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 multiple charging piles. When multiple charging piles connected to the vehicle can independently meet the current total demand voltage and the total demand current, charging the power battery simultaneously using these multiple charging piles, compared with charging using only one of the charging piles, is beneficial to reducing the load on a single charging pile, reducing the risk of damage to the charging pile, and is beneficial to improving the safety of the charging process. At the same time, a smoother charging curve can be achieved, avoiding excessive current fluctuations during charging, which is beneficial to reducing damage to the power battery, thereby achieving power battery protection. If the maximum output power of at least one charging pile cannot independently meet the total demand current and the total demand voltage, it is necessary to further allocate the total demand current according to the difference between the maximum output powers of each charging pile to improve the accuracy of charging control.

[0065] In addition, when at least two charging interfaces are connected to the same charging pile, the charging method further includes: evenly dividing the total demand current as the demand current of each charging interface connected to the charging pile. In this way, it can be ensured that the current required by each interface operates within the load range of the charging pile, so as to avoid the charging pile from being overloaded due to excessive current in a single interface, thereby improving the stability and safety of the charging pile. Correspondingly, in some embodiments, when the charging interface includes a first charging interface and a second charging interface, according to the charging capacity 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: when the maximum output power of the charging pile can independently meet the total demand current and the total demand voltage, the total demand current is evenly divided as the demand current of the first charging interface and the demand current of the second charging interface respectively. When the maximum output power of at least one charging pile cannot independently meet 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 to each charging interface to determine the demand currents of the charging interfaces connected to the charging piles, including: evenly dividing the total demand current when the difference is less than or equal to the difference threshold. When the difference is greater than the difference threshold, the total demand current is sequentially allocated to at least two charging interfaces in ascending order of the maximum output powers of the multiple charging piles 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 sum of the allocated demand currents reaches the total demand current.

[0067] Here, in some embodiments, the difference threshold is a preset 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 among the charging piles, and use a set ratio of this maximum output power as the difference threshold. For example, use 20% of this maximum output power as the difference threshold.

[0068] When the difference is less than or equal to the difference threshold, the total demand current is evenly divided. That is, when the charging capabilities of the charging piles are similar, each charging pile charges with the same demand current, which is beneficial to narrowing the difference in demand current between the charging interfaces, avoiding uneven temperature of the power battery caused by unbalanced charging, accelerating the aging of the power battery, and thus affecting the overall life and performance of the battery.

[0069] When the difference is greater than the difference threshold, the total demand current is further refined and allocated. Specifically, the charging interfaces are sorted in ascending order of the maximum output powers of the connected charging piles, and the demand currents are determined in sequence. During the allocation process, it is determined that the product of the demand current and demand voltage of the charging interface with a smaller maximum output power of the connected charging pile reaches the maximum output power. The demand current of the charging interface with a larger maximum output power of the connected charging pile makes up the remaining part of the total demand current. In this way, when the final allocation result meets the total output current, it is beneficial for the demand currents of the charging interfaces to be as close as possible, which is beneficial to narrowing the difference in demand current between the charging interfaces, avoiding uneven temperature of the power battery caused by unbalanced charging, accelerating the aging of the power battery, and thus affecting the overall life and performance of the power battery.

[0070] Correspondingly, in some embodiments, when the charging interface includes a first charging interface and a second charging interface, the total demand current is allocated according to the difference between the maximum output powers of the charging piles, including: when the difference is less than or equal to the difference threshold, the total demand current is evenly divided and used as the demand currents of the first charging interface and the second charging interface respectively; when the difference is greater than the set threshold, the current corresponding to the maximum output power of the charging pile with the smaller maximum output power is used as the demand current of the charging interface connected to the charging pile; the difference obtained by subtracting the current corresponding to the maximum output power of the charging pile with the smaller maximum output power from the total demand current is used 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 to the first charging pile, and the second charging interface is connected to 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 the set threshold, the magnitude 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 less than the maximum output power of the second charging pile, it is determined that the demand current of the first charging interface is the quotient obtained by dividing the maximum output power of the first charging pile by the demand voltage of the first charging pile. Further, it is 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, when the capabilities of the charging piles charging the first charging interface and the second charging interface are uneven, the demand currents of the first charging interface and the second charging interface are made as close as possible, avoiding uneven temperatures of the power battery caused by uneven charging, accelerating the aging of the power battery, and thus affecting 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. As shown in Figure 6 According to the charging capacity of the charging pile, determining the charging requirements of at least two charging interfaces includes steps S1201 to S1203.

[0073] Step S1201, determining the demand currents of at least two charging interfaces according to the maximum output power.

[0074] Here, the specific processes of the foregoing steps S121 and S122 can be followed and will not be elaborated further.

[0075] Step S1202, during the process of the charging pile charging the power battery, obtaining the actual output power of the charging pile.

[0076] Step S1203, adjusting the demand currents of at least two charging interfaces according to the actual output power of the charging pile.

[0077] Considering that during the implementation process, since there may be situations such as the charging pile still being connected to other vehicles, which will result in a large gap between the actual output power of the charging pile and the maximum output power. During the process of the charging pile charging the power battery, the required current of the charging interface is further adjusted according to the actual output power of the charging pile, so as to achieve an adaptive adjustment of the charging process, improve the accuracy of charging control, and further improve the 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, according to the actual output power of the charging pile, adjusting the required current of each charging interface includes: 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, adjusting the required current of the first charging interface and the required current of the second charging interface; the required power is the product of the required current and the required voltage of the charging interface. In this way, the adjustment of the required current is only performed when the required power distribution of the current charging interfaces is uneven, which is beneficial to avoiding 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. In this way, it is beneficial to prevent the charging pile from being overloaded, helps the charging process to run more smoothly, and reduces the risk of damage to the power battery.

[0080] In some embodiments, adjusting the required current of the first charging interface and the required 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 required current and the required current of the first charging interface; adjusting the required current of the second charging interface to the smaller value between the maximum output current and the difference. In this way, it is beneficial to adjust and optimize the current distribution, reduce power waste, and improve the charging efficiency. At the same time, it can effectively balance the load of the charging pile, avoid overloading problems, and ensure the charging equipment operates efficiently within a safe range. It can improve the user's charging experience, avoid the risk of extended charging time or damage to the power battery, and is also beneficial to extending the service life of the charging pile.

[0081] When the charging gun of the charging pile is connected to the charging interface for charging, since each charging interface is independent of each other, when multiple charging interfaces are connected to the charging gun, the startup processes are also multiple independent ones. Still taking the example that both the first charging interface and the second charging interface are connected to the charging pile, here in combination with Figure 7 The specific charging process includes the following steps.

[0082] Step S300, start.

[0083] In step S311, the insulation between the first charging interface and the power battery is turned off.

[0084] When it is detected that the charging pile communicates with the first charging interface, the insulation between the first charging interface and the power battery is immediately turned off. Specifically, in some embodiments, if CC2 (Charge Controller 2) is detected, the insulation between the first charging interface and the power battery is immediately turned off. CC2, as a part of the vehicle charging system, is used to manage the communication between the battery management system and the charging pile during the charging process.

[0085] After the insulation is turned off, the electrical connection between the first charging interface and the power battery has been normally connected for the subsequent charging process.

[0086] Here, it should be noted that after the insulation is turned off, it is sent according to the insulation value at the moment before turning off until the insulation is turned on again. In this way, it is possible to avoid the system misjudging the subsequent process as an insulation fault and issuing relevant alarms or other measures to deal with the insulation fault.

[0087] In step S312, messages such as CHM (Charging Request Message), BHM (Battery Health Message), CRM (Charging Resource Message), and BRM (Battery Resource Message) are sequentially sent and received.

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

[0089] In step S313, the connection status between the first charging interface and the charging pile is judged to confirm whether the next operation can be continued.

[0090] In step S314, the fast charging relay between the battery management system and the first charging interface is closed.

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

[0092] In step S315, insulation detection is started.

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

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

[0095] The communication continues, 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 needs to be executed.

[0097] In step S317, within the set time after the insulation between the charging interface and the power battery is turned off, if the charging pile connected to the first charging interface fails to establish an electrical connection, control the insulation between the first charging interface and the power battery to be restored and exit the charging process.

[0098] If the first charging interface and the charging pile are still not powered on within this set time, it means that the charging pile has not been started or has malfunctioned. At this time, to avoid the safety risk caused by the non-insulated state between the first charging interface and the power battery when charging is not possible, 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] In step S321, the insulation between the second charging interface and the power battery is turned off.

[0100] When it is detected that the charging pile communicates with the second charging interface, the insulation between the second charging interface and the power battery is immediately turned off. Specifically, in some embodiments, if CC2 (Charge Controller 2) is detected, the insulation between the second charging interface and the power battery is immediately turned off. CC2 is part of the vehicle charging system and is used to manage the communication between the battery management system and the charging pile during the charging process.

[0101] After the insulation is turned off, the electrical connection between the second charging interface and the power battery has been normally connected for the subsequent charging process.

[0102] Here, it should be noted that after the insulation is turned off, it is sent according to the insulation value at the moment before turning off until the insulation is turned on again. In this way, the system can be prevented from misjudging the subsequent process as an insulation fault and issuing relevant alarms or other measures to deal with insulation faults.

[0103] Step S322: Sequentially send and receive messages such as CHM (Charging Request Message), BHM (Battery Health Message), CRM (Charging Resource Message), and BRM (Battery Resource Message).

[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: Judge the connection status between the second charging interface and the charging pile. It is used to confirm whether the next operation can be continued.

[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 charge the second charging interface quickly.

[0108] Step S325: Start the insulation detection.

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

[0110] Step S326: Sequentially send and receive messages such as BCP (Battery Charging Process Message), BRO (Battery Charging Request), CRO (Charging Recovery Request), BCL (Battery Charging Limit), and BCS (Battery Charging Status).

[0111] The communication continues to execute, 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.

[0112] In addition, after step S321, step S327 needs to be executed.

[0113] Step S327: If an electrical connection is not established with the charging pile connected to the second charging interface within the set time after the insulation between the charging interface and the power battery is turned off, control the insulation between the second charging interface and the power battery to be restored and exit the charging process.

[0114] If the second charging interface and the charging pile are still not energized within this set time, it indicates that the charging pile has not been started or has malfunctioned. At this time, to avoid the safety risk caused by the non-insulated state between the second charging interface and the power battery being maintained all the time when charging is not possible, the insulation between the second charging interface and the power battery is restored, 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", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

Claims

1. A method for charging a vehicle, characterized in that: 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 via an independent charging line, and each of the charging interfaces is connected to the battery management system via an independent communication bus, and the battery management system is connected to the power battery; The multiple 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 multiple charging interfaces establish communication with the charging pile, obtaining the charging capacity of the charging pile; Determining charging requirements of the at least two charging interfaces according to the charging capacity of the charging pile; According to the respective charging requirements of the at least two charging interfaces, the charging pile is controlled to output the charging requirements of the correspondingly connected charging interfaces through the charging gun, so as to charge the power battery.

2. The charging method according to claim 1, characterized in that: The determining, according to the charging capacity of the charging pile, the charging requirements of the at least two charging interfaces includes: Obtaining a total required current and a total required voltage required for charging the power battery, wherein the total required voltage is used as a required voltage of each of the at least two charging interfaces; The total required current is distributed according to the charging capability of the charging pile to determine the required current of each of the at least two charging interfaces.

3. The charging method according to claim 2, characterized in that: The charging capacity of the charging pile includes the maximum output power of the charging pile; the at least two charging interfaces are connected to a plurality of the charging piles; The allocating the total demand current according to the charging capacity of the charging pile to determine the demand current of each charging interface connected to the charging pile includes: In the case where the maximum output power of the charging pile can independently meet the total required current and the total required voltage, the total required current is evenly divided as the required current of each charging port connected to the charging pile; When the maximum output power of at least one of the plurality of charging piles cannot independently meet the total required current and the total required voltage, the total required current is allocated according to the difference between the maximum output powers of the plurality of charging piles.

4. The charging method according to claim 3, characterized in that: The allocating the total demand current according to the difference between the maximum output powers of the charging piles to which the respective charging interfaces are connected, so as to determine the demand current of the respective charging interfaces connected to the charging piles, comprises: When the difference is less than or equal to the difference threshold, evenly divide the total demand current; When the difference is greater than the difference threshold, the total demand current is allocated to the at least two charging interfaces in order of the maximum output power of the multiple charging piles from small to large 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 sum of the allocated demand currents reaches the total demand current.

5. The charging method according to claim 2, characterized in that: The obtaining of the total required current and the total required voltage required for charging the power battery comprises: Obtaining battery status information of the power battery; Determine the total required current and the total required voltage according to the battery status information; The battery status information includes at least part of the battery coolant temperature, the average battery temperature, the battery health, the limiting current of the vehicle's charging device, the actual charging state of the battery, and the charging state point at a specific state of charge at the charging terminal.

6. The charging method according to claim 2, characterized in that: The charging capacity of the charging pile includes the maximum output power and the actual output power of the charging pile; The determining, according to the charging capacity of the charging pile, the charging requirements of the at least two charging interfaces includes: Determining required currents of the at least two charging interfaces according to the maximum output power; During the process of charging the power battery by the charging pile, obtaining the actual output power of the charging pile; According to the actual output power of the charging pile, the required current of the at least two charging interfaces is adjusted.

7. The charging method according to claim 6, characterized in that: The at least two charging interfaces include a first charging interface and a second charging interface, the first charging interface is connected to a first charging pile, and the second charging interface is connected to a second charging pile; and adjusting the required current of each of the charging interfaces according to the actual output power of the charging pile includes: 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, adjust the required current of the first charging interface and the required current of the second charging interface; the required power is the product of the required current and the required voltage of the charging interface.

8. The charging method according to claim 7, characterized in that: The adjusting the demand current of the first charging interface and the demand current of the second charging interface includes: The required current of the first charging interface is reduced so that the required power of the first charging interface is equal to the actual output power of the first charging pile.

9. The charging method according to claim 8, characterized in that: The adjusting 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 required current and the required current of the first charging interface; The demand current of the second charging interface is adjusted to a smaller value between the maximum output current and the difference.

10. The charging method according to claim 1, characterized in that: Also includes: After one 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; During the charging process of the charging interface, if at least one of the other charging interfaces starts to establish communication with the charging pile, the step of obtaining the charging capability of the charging pile is performed after the communication is established.

11. A method for charging a vehicle, characterized in that: The vehicle comprises a power battery, a battery management system, a first charging interface and a second charging interface, wherein the first charging interface and the second charging interface are connected to the power battery through independent charging lines, and the first charging interface and the second charging interface are connected to the battery management system through independent communication buses; the first charging interface and the second charging interface are used to be connected to charging guns of one or two charging piles; The charging method comprises: After both the first charging interface and the second charging interface establish communication with the charging pile, the charging capacity of the charging pile is obtained; Determining charging requirements of the first charging interface and the second charging interface according to the charging capacity of the charging pile; According to the charging requirements of the first charging interface and the second charging interface, the charging pile is controlled to output the charging requirements of the correspondingly connected first charging interface or second charging interface through the charging gun to charge the power battery.

12. A vehicle, characterized in that: include: Power battery; A battery management system, electrically connected to the power battery; Multiple charging interfaces, each of which is connected to the power battery via an independent charging line, and each of which is connected to the battery management system via a power communication bus; the multiple charging interfaces are used to connect to the charging guns of one or more charging piles; One or more processors, configured to implement the vehicle charging method as described in any one of claims 1 to 11.

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