A charging current distribution method and device for an electric vehicle and the electric vehicle

Abstract

The application discloses a charging current distribution method and device of an electric vehicle and the electric vehicle, and can isolate interference between double guns and realize independent charging of the double guns. The charging current distribution method of the electric vehicle comprises the following steps: acquiring a maximum allowed charging current of a battery system, a maximum output capacity of a first charging gun, a maximum output capacity of a second charging gun and a maximum bearing current limit value of battery system hardware; performing equal proportion distribution of a target current of the first charging gun and a target current of the second charging gun based on the maximum allowed charging current of the battery system; taking the minimum value among the target current, the maximum output capacity and the maximum bearing current limit value of the battery system hardware as a required current of the charging gun; and performing current distribution on the first charging gun and the second charging gun based on the battery required current of the first charging gun and the battery required current of the second charging gun.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicle charging, in particular to a charging current distribution method and device for electric vehicles and an electric vehicle. BACKGROUND

[0002] With the rapid development of the electric vehicle industry, the market demand for efficient and convenient charging infrastructure is increasingly urgent. The double-gun charging pile has become the core equipment of the public charging network due to its advantages of simultaneously serving two vehicles and improving the utilization rate of the site. At present, when the double guns of the charging pile are simultaneously connected to the same vehicle for charging, the double guns are prone to mutual interference and mutual restriction. When the current is distributed, the restriction between the double guns needs to be considered, and independent current distribution of the charging guns cannot be achieved, thereby resulting in low flexibility and low charging efficiency of the current double-gun charging mode. SUMMARY

[0003] In order to solve the above technical problems, the present application is proposed. The embodiments of the present application provide a charging current distribution method and device for electric vehicles and an electric vehicle, which can isolate the interference between the double guns and realize independent charging of the double guns.

[0004] According to a first aspect of the present application, a charging current distribution method for an electric vehicle is provided. The electric vehicle includes a battery system. The charging current distribution method for the electric vehicle includes: when it is detected that the electric vehicle is physically connected to a first charging gun and a second charging gun, obtaining a maximum allowed charging current of the battery system, a maximum output capacity of the first charging gun, a maximum output capacity of the second charging gun, and a maximum bearing current limit value of the battery system hardware; based on the maximum allowed charging current of the battery system, performing equal proportion distribution according to the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun to obtain a target current of the first charging gun and a target current of the second charging gun; taking the minimum value among the target current of the first charging gun, the maximum output capacity of the first charging gun, and the maximum bearing current limit value of the battery system hardware as a battery demand current of the first charging gun; taking the minimum value among the target current of the second charging gun, the maximum output capacity of the second charging gun, and the maximum bearing current limit value of the battery system hardware as a battery demand current of the second charging gun; and distributing the current to the first charging gun and the second charging gun based on the battery demand current of the first charging gun and the battery demand current of the second charging gun.

[0005] As a possible implementation manner, the charging current distribution method of the electric vehicle further includes: when it is detected that the electric vehicle is physically connected with any charging gun, taking the minimum value of the maximum allowed charging current of the battery system, the maximum output capability fed back by the charging gun, and the maximum bearing current limit value of the battery system hardware as the required current of the battery system; wherein the any charging gun represents any one of the first charging gun and the second charging gun.

[0006] As a possible implementation manner, the obtaining of the target current of the first charging gun and the target current of the second charging gun based on the maximum allowed charging current of the battery system and in accordance with the maximum output capability of the first charging gun and the maximum output capability of the second charging gun in equal proportion includes: when the maximum bearing current limit value of the battery system hardware is greater than the required current of the battery system, and the required current of the battery system is greater than the sum of the maximum output capability of the first charging gun and the maximum output capability of the second charging gun, the target current of the first charging gun and the target current of the second charging gun are obtained based on the maximum allowed charging current of the battery system and in accordance with the maximum output capability of the first charging gun and the maximum output capability of the second charging gun in equal proportion.

[0007] As a possible implementation manner, the obtaining of the target current of the first charging gun and the target current of the second charging gun based on the maximum allowed charging current of the battery system and in accordance with the maximum output capability of the first charging gun and the maximum output capability of the second charging gun in equal proportion includes: when the maximum bearing current limit value of the battery system hardware is greater than the required current of the battery system, the required current of the battery system is less than the sum of the maximum output capability of the first charging gun and the maximum output capability of the second charging gun, and the required current of the battery system is less than the maximum output capability of the first charging gun, the required current of the battery system is less than the maximum output capability of the second charging gun, the target current of the first charging gun and the target current of the second charging gun are obtained based on the maximum allowed charging current of the battery system and in accordance with the maximum output capability of the first charging gun and the maximum output capability of the second charging gun in equal proportion.

[0008] As a possible implementation manner, the target current of the first charging gun and the target current of the second charging gun are obtained by equal proportion distribution based on the maximum allowed charging current of the battery system according to the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun, including: when the maximum bearing current limit value of the battery system hardware is greater than the required current of the battery system, the required current of the battery system is less than the sum of the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun, and the required current of the battery system is greater than the maximum output capacity of the first charging gun, the required current of the battery system is less than the maximum output capacity of the second charging gun, the target current of the first charging gun and the target current of the second charging gun are obtained by equal proportion distribution based on the maximum allowed charging current of the battery system according to the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun.

[0009] As a possible implementation manner, the target current of the first charging gun and the target current of the second charging gun are obtained by equal proportion distribution based on the maximum allowed charging current of the battery system according to the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun, including: calculating the sum of the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun to obtain the total maximum output capacity of the charging gun; based on the proportion of the maximum output capacity of the first charging gun in the total maximum output capacity of the charging gun and the maximum allowed charging current of the battery system, the maximum allowed charging current allocated to the first charging gun is calculated as the target current of the first charging gun; based on the proportion of the maximum output capacity of the second charging gun in the total maximum output capacity of the charging gun and the maximum allowed charging current of the battery system, the maximum allowed charging current allocated to the second charging gun is calculated as the target current of the second charging gun.

[0010] As a possible implementation manner, the charging current distribution method of the electric vehicle further includes: when it is detected that the first charging gun or the second charging gun is not connected, a parameter configuration request is sent to the charging gun still connected to obtain the maximum output capacity fed back by the charging gun still connected; based on the maximum allowed charging current of the battery system, the maximum output capacity fed back by the charging gun still connected and the maximum bearing current limit value of the battery system hardware, the charging current distribution is performed on the charging gun still connected.

[0011] As a possible implementation, the method further includes: based on the minimum temperature and the state of charge of the battery system, sending the maximum allowed charging current of the battery system to the charging piles of the first charging gun and the second charging gun; wherein the maximum allowed charging current of the battery system is calculated by the battery management system based on the maximum capacity of the battery system and the number of parallel branches of the battery system; and the charging piles feed back the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun to the battery management system based on the received maximum allowed charging current of the battery system.

[0012] According to a second aspect of the present application, a charging current distribution device for an electric vehicle is provided, the electric vehicle comprising a battery system, the charging current distribution device for the electric vehicle comprising: an obtaining module, configured to obtain the maximum allowed charging current of the battery system, the maximum output capacity of the first charging gun, the maximum output capacity of the second charging gun, and the maximum bearing current limit of the battery system hardware when detecting that the electric vehicle is physically connected to the first charging gun and the second charging gun; a first distribution module, configured to obtain the target current of the first charging gun and the target current of the second charging gun by equal proportion distribution according to the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun based on the maximum allowed charging current of the battery system; a first value module, configured to take the minimum value among the target current of the first charging gun, the maximum output capacity of the first charging gun, and the maximum bearing current limit of the battery system hardware as the battery demand current of the first charging gun; a second value module, configured to take the minimum value among the target current of the second charging gun, the maximum output capacity of the second charging gun, and the maximum bearing current limit of the battery system hardware as the battery demand current of the second charging gun; and a second distribution module, configured to distribute the current to the first charging gun and the second charging gun based on the battery demand current of the first charging gun and the battery demand current of the second charging gun.

[0013] According to a third aspect of the present application, an electric vehicle is provided, comprising: a battery system configured to be connected to a charging pile for charging; and the charging current distribution device for the electric vehicle according to the second aspect or any one of the implementation manners of the second aspect, the charging current distribution device for the electric vehicle being in communication connection with the battery system.

[0014] The application provides a charging current distribution method and device of an electric vehicle and the electric vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:

[0016] Figure 1 FIG. 1 is a flowchart of a charging current distribution method of an electric vehicle according to an example embodiment of the present application.

[0017] Figure 2 FIG. 2 is a structural diagram of a charging current distribution device of an electric vehicle according to an example embodiment of the present application.

[0018] Figure 3 FIG. 3 is a structural diagram of an electronic device according to an example embodiment of the present application. DETAILED DESCRIPTION

[0019] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:

[0020] As the global number of electric vehicles gradually increases, charging infrastructure, as a key support for industrial development, has become a core component of public charging networks due to its advantage of simultaneously serving two vehicles and improving the utilization rate of charging stations. Currently, mainstream dual-gun charging piles primarily follow two strategies for output power distribution during operation: First, when two vehicles are charging simultaneously, the charging pile evenly distributes the total available power to both charging guns. This strategy is simple to implement but does not consider the actual needs of the connected vehicles and their battery status, resulting in low charging efficiency. Second, the charging pile communicates with the vehicle's battery management system (BMS) to obtain the requested current from each vehicle and attempts to allocate power as needed. However, when the sum of the requested power from the two vehicles exceeds the total capacity of the charging pile, the system typically uses a simple polling method to reduce the output current to ensure that the total power does not exceed the limit. Therefore, existing dual-gun charging technology, due to its inherent power coupling characteristics and simple allocation strategy, suffers from significant drawbacks such as mutual interference, low efficiency, lag response, and a lack of intelligent arbitration, leading to low vehicle charging efficiency.

[0021] To overcome the limitations of mutual interference in dual-gun charging and improve charging efficiency, Figure 1 This is a schematic flowchart of a charging current distribution method for an electric vehicle provided in an exemplary embodiment of this application. Figure 1 For example, firstly, when it is detected that the electric vehicle has completed physical connection with both the first and second charging guns, the maximum allowable charging current of the battery system, the maximum output capacity of the first charging gun, the maximum output capacity of the second charging gun, and the maximum current limit that the battery system hardware can withstand are obtained (see...). Figure 1 (S110). Secondly, based on the maximum allowable charging current of the battery system, the target currents for the first and second charging guns are proportionally allocated according to the maximum output capabilities of the first and second charging guns (see S110). Figure 1 (S120). Then, the minimum value among the target current of the first charging gun, the maximum output capacity of the first charging gun, and the maximum current limit of the battery system hardware is taken as the battery demand current of the first charging gun (see S120). Figure 1 (S130) The minimum value among the target current of the second charging gun, the maximum output capacity of the second charging gun, and the maximum current limit of the battery system hardware is used as the battery demand current of the second charging gun (see S130). Figure 1 (S140). Finally, based on the battery demand current of the first charging gun and the battery demand current of the second charging gun, current is allocated between the first charging gun and the second charging gun (see S140). Figure 1 The S150 breaks the limitation of mutual interference between dual guns charging on the same pile. It flexibly adjusts the charging current according to multiple limits, and realizes dynamic adjustment of the charging current according to the charging gun mode, thereby improving the charging capacity of the charging pile and increasing the charging rate of the whole vehicle, and accurately matching the charging needs of the whole vehicle.

[0022] The following description is made in connection with Figure 1 The charging current distribution method for the electric vehicle provided by the embodiments of the present application is described in more detail.

[0023] In S110, when it is detected that the electric vehicle is physically connected with both the first charging gun and the second charging gun, the maximum allowed charging current of the battery system, the maximum output capacity of the first charging gun, the maximum output capacity of the second charging gun, and the maximum bearing current limit of the battery system hardware are obtained.

[0024] In some embodiments, when it is detected that the electric vehicle is physically connected with any charging gun, the minimum value among the maximum allowed charging current of the battery system, the maximum output capacity fed back by the charging gun, and the maximum bearing current limit of the battery system hardware is taken as the required current of the battery system; wherein any charging gun refers to any of the first charging gun and the second charging gun.

[0025] The maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun are the maximum output current capacity that the charging pile can provide, which is determined by the hardware design of the charging pile. If the output capacity of the charging pile is low, even if the BMS and the battery system allow higher current, the charging speed will be limited by the output capacity of the charging pile. The maximum allowed charging current of the battery system is the upper limit of the safe charging current calculated by the battery management system according to the current state of the battery (such as SOC, temperature, voltage, and internal resistance, etc.). The BMS dynamically adjusts the IBCP to prevent overcharging, overheating, or battery damage by real-time monitoring of battery parameters. The BMS sends the maximum allowed charging current of the battery system to the charging pile through the communication protocol. For safety reasons, the charging pile needs to ensure that the actual output current does not exceed this value. Therefore, if the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun are higher than the maximum allowed charging current of the battery system, the charging current will also be limited within the range of the maximum allowed charging current of the battery system. The maximum bearing current limit of the battery system hardware is determined by the physical properties of the battery, including cell materials, structural design, heat dissipation capacity, etc. Even if the output capacity of the charging pile and the maximum allowed charging current of the battery system are both high, if the battery system hardware cannot bear it (such as the cell internal resistance being too large causing serious heating), the actual charging current will still be limited below the maximum bearing current limit of the battery system hardware. Therefore, based on the minimum value among the three, the target current of the first charging gun and the second charging gun is distributed, which can ensure the safety during the charging process of the electric vehicle.

[0026] In some embodiments, during the charging process, the electric vehicle is physically connected to the first charging gun and the second charging gun of the charging pile through the charging cable, and after the charging handshake stage ends, the BMS (Battery Management System) enters the charging parameter configuration stage with the charger. The BMS sends a message (Battery Charging Parameters, BCP) to the charging pile, which mainly describes the charging parameters of the power battery. The BCP contains the maximum allowed charging current, so the BMS calculates and sends the maximum allowed charging current of the battery system of the electric vehicle to the charging pile. Then, after the charging pile receives the BCP, it sends the maximum output capacity of the charging pile to the BMS, that is, the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun, or it can be understood as the maximum current allowed by the charging pile. After completing the parameter configuration, the normal charging process is entered.

[0027] The maximum allowed charging current of the battery system is a crucial concept in the battery management system (BMS) and is calculated by the BMS based on the real-time state of the battery. It is the maximum charging power that the battery can safely accept at the current time. Since the battery capacity of an electric vehicle is not fixed but is dynamically affected by various factors, the maximum allowed charging current of the battery system is the real-time safe charging upper limit calculated by the BMS based on these factors. The main influencing factors of the maximum allowed charging current of the battery system include the state of charge of the battery, the temperature of the battery, the state of health of the battery, the consistency of the battery cells, and the voltage upper limit. For example, when the battery is low, it can accept a very large charging current. As the charge increases, the BMS will significantly reduce the IBCP to protect the battery and prevent overcharging. The temperature of the battery is a best working temperature range for the battery. Within the best working temperature range, the battery can safely and stably charge.

[0028] For example, based on the minimum temperature and state of charge of the battery system, the maximum allowed charging current of the battery system is sent to the charging pile of the first charging gun and the second charging gun. The maximum allowed charging current of the battery system is calculated by the battery management system based on the maximum capacity of the battery system and the number of parallel branches of the battery system. The charging pile feeds back the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun to the battery management system based on the received maximum allowed charging current of the battery system.

[0029] As a possible implementation, the calculation principle of the maximum allowed charging current of the battery system is as follows:

[0030] Equation One;

[0031] In Formula One, the maximum capacity of the battery system refers to the absolute maximum charging current that the battery pack can withstand under ideal conditions (such as optimal temperature, optimal SOC, and brand-new state), which is provided by the battery cell manufacturer and usually expressed in terms of charging rate. Branch refers to the battery cell group connected in parallel inside the battery pack, and 30A is an empirical value, which is the tolerance buffer reserved by engineers for each branch to compensate for inconsistencies between battery cells. Due to manufacturing errors and usage wear, there will be slight differences in voltage and internal resistance between different branches in the same battery pack. The 30A buffer is to ensure that even if the current of a branch is slightly larger, it will not exceed the safety limit of the battery cell. This empirical value can be adjusted according to actual needs.

[0032] In S120, based on the maximum allowed charging current of the battery system, the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun are proportionally allocated to obtain the target current of the first charging gun and the target current of the second charging gun.

[0033] In some embodiments, in the charging parameter configuration phase, the system proportionally allocates the maximum allowed charging current of the battery system to the double guns, and takes the minimum value among the maximum output capacity of the charging pile, the maximum current that the battery system hardware can withstand, and the single-gun maximum allowed charging current after proportional allocation as the required current of each charging gun.

[0034] When performing single-gun charging or double-gun independent charging current dynamic adjustment, the charging current distribution method of the electric vehicle is applicable to the following cases:

[0035] Case 1: Ihardware> IBCL> Igun1+ Igun2; where Ihardware represents the maximum current limit that the battery system hardware can withstand, IBCL represents the required current of the battery system, Igun1 represents the maximum output capacity of the first charging gun, and Igun2 represents the maximum output capacity of the second charging gun. When the maximum current limit that the battery system hardware can withstand is greater than the required current of the battery system, and the required current of the battery system is greater than the sum of the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun, the maximum allowed charging current of the battery system is proportionally allocated according to the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun to obtain the target current of the first charging gun and the target current of the second charging gun. If it is a single-gun charging case, the maximum output capacity of the other gun is adjusted to 0.

[0036] Case 2: Ihardware> IBCL < Igun1 + Igun2 & IBCL < Igun1 & IBCL < Igun2; wherein, Ihardware represents the maximum bearing current limit of the battery system hardware, IBCL represents the demand current of the battery system, Igun1 represents the maximum output capability of the first charging gun, Igun2 represents the maximum output capability of the second charging gun. That is, when the maximum bearing current limit of the battery system hardware is greater than the demand current of the battery system, the demand current of the battery system is less than the sum of the maximum output capability of the first charging gun and the maximum output capability of the second charging gun, and the demand current of the battery system is less than the maximum output capability of the first charging gun, and the demand current of the battery system is less than the maximum output capability of the second charging gun, based on the maximum allowed charging current of the battery system, the maximum output capability of the first charging gun and the maximum output capability of the second charging gun are proportionally distributed to obtain the target current of the first charging gun and the target current of the second charging gun.

[0037] Case 3: Ihardware> IBCL < Igun1 + Igun2 & IBCL > Igun1 & IBCL < Igun2; wherein, Ihardware represents the maximum bearing current limit of the battery system hardware, IBCL represents the demand current of the battery system, Igun1 represents the maximum output capability of the first charging gun, Igun2 represents the maximum output capability of the second charging gun. That is, when the maximum bearing current limit of the battery system hardware is greater than the demand current of the battery system, the demand current of the battery system is less than the sum of the maximum output capability of the first charging gun and the maximum output capability of the second charging gun, and the demand current of the battery system is greater than the maximum output capability of the first charging gun, and the demand current of the battery system is less than the maximum output capability of the second charging gun, based on the maximum allowed charging current of the battery system, the maximum output capability of the first charging gun and the maximum output capability of the second charging gun are proportionally distributed to obtain the target current of the first charging gun and the target current of the second charging gun.

[0038] Case 4: Ihardware> IBCL < Igun1 + Igun2 & IBCL > Igun2 & IBCL < Igun1; wherein, Ihardware represents the maximum bearing current limit of the battery system hardware, IBCL represents the demand current of the battery system, Igun1 represents the maximum output capability of the first charging gun, Igun2 represents the maximum output capability of the second charging gun. That is, when the maximum bearing current limit of the battery system hardware is greater than the demand current of the battery system, the demand current of the battery system is less than the sum of the maximum output capability of the first charging gun and the maximum output capability of the second charging gun, and the demand current of the battery system is less than the maximum output capability of the first charging gun, and the demand current of the battery system is greater than the maximum output capability of the second charging gun, based on the maximum allowed charging current of the battery system, the maximum output capability of the first charging gun and the maximum output capability of the second charging gun are proportionally distributed to obtain the target current of the first charging gun and the target current of the second charging gun.

[0039] In some embodiments, the single-gun charging is charged according to the normal charging standard, and the maximum output capacity of the unconnected gun is set to 0. For example, when the CC2_1 signal (connection confirmation signal) is detected, the parameter configuration phase is triggered to confirm the charging parameters, and after the parameter configuration is completed, the normal charging process is started.

[0040] In other embodiments, when switching from single-gun to double-gun charging, first enter the single-gun charging mode, establish the connection between the first charging gun (here, the first charging gun physically connected with the electric vehicle) and the battery system. Real-time monitoring of the charging interface state, when detecting the insertion of the second charging gun, triggering the charging parameter configuration process, in the charging parameter configuration phase, based on the maximum allowed charging current of the battery system, according to the respective maximum output capacity of the double guns, the maximum allowed charging current allocated to each charging gun is calculated.

[0041] In some embodiments, the calculation of the target current of the first charging gun and the target current of the second charging gun can be calculated by: calculating the sum of the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun to obtain the total maximum output capacity of the charging gun, based on the proportion of the maximum output capacity of the first charging gun in the total maximum output capacity of the charging gun, and the maximum allowed charging current of the battery system, the maximum allowed charging current allocated to the first charging gun is calculated as the target current of the first charging gun; based on the proportion of the maximum output capacity of the second charging gun in the total maximum output capacity of the charging gun, and the maximum allowed charging current of the battery system, the maximum allowed charging current allocated to the second charging gun is calculated as the target current of the second charging gun.

[0042] As a possible calculation formula for calculating the target current of the first charging gun:

[0043] Formula two;

[0044] In formula two, I'gun1 represents the target current of the first charging gun, Igun1 represents the maximum output capacity of the first charging gun, Igun2 represents the maximum output capacity of the second charging gun, and IBCP represents the maximum allowed charging current of the battery system.

[0045] As a possible calculation formula for calculating the target current of the second charging gun:

[0046] Formula three;

[0047] In formula three, I'gun2 represents the target current of the second charging gun, Igun1 represents the maximum output capacity of the first charging gun, Igun2 represents the maximum output capacity of the second charging gun, and IBCP represents the maximum allowed charging current of the battery system.

[0048] In S130, the minimum value of the target current of the first charging gun, the maximum output capacity of the first charging gun, and the maximum bearing current limit value of the battery system hardware is taken as the battery demand current of the first charging gun.

[0049] In some embodiments, after the target current of the first charging gun is calculated, the minimum value of the target current of the first charging gun, the maximum output capacity of the first charging gun, and the maximum bearing current limit value of the battery system hardware is taken as the battery demand current of the first charging gun. The three need to be matched together, and the limitation of any one may become the bottleneck of the charging speed. Therefore, taking the minimum value can reduce the influence of the limit value, improve the charging efficiency, and ensure the charging safety. That is, IBCL1 = min (I'gun1, Igun1, Ihardware).

[0050] In S140, the minimum value of the target current of the second charging gun, the maximum output capacity of the second charging gun, and the maximum bearing current limit value of the battery system hardware is taken as the battery demand current of the second charging gun.

[0051] In some embodiments, after the target current of the second charging gun is calculated, the minimum value of the target current of the second charging gun, the maximum output capacity of the second charging gun, and the maximum bearing current limit value of the battery system hardware is taken as the battery demand current of the second charging gun. Therefore, the second charging gun takes the minimum value to reduce the influence of the limit value, improve the charging efficiency, and ensure the charging safety. That is, IBCL2 = min (I'gun2, Igun2, Ihardware).

[0052] In S150, based on the battery demand current of the first charging gun and the battery demand current of the second charging gun, the current of the first charging gun and the second charging gun is allocated.

[0053] After the parameter configuration is completed, the double-charging gun independent control process is started, and the power of the first charging gun and the second charging gun is allocated and controlled according to the calculated battery demand current of the first charging gun and the battery demand current of the second charging gun, so that the power limit of the double-gun charging can be broken through, and the charging efficiency can be improved by dynamically adapting to the charging gun capacity and vehicle demand.

[0054] In some embodiments, when the double gun switches to single gun charging, that is, when it is detected that the first charging gun or the second charging gun is not connected (the battery demand current switches from double gun mode to single gun mode), a parameter configuration request is sent to the still connected charging gun, the maximum output capability fed back by the still connected charging gun is obtained, and the charging current of the still connected charging gun is allocated based on the maximum allowed charging current of the battery system, the maximum output capability fed back by the still connected charging gun, and the maximum bearing current limit of the battery system hardware. Therefore, in addition to dynamic adaptive charging of the same pile double charging, independent charging of the double gun can also be supported, and the charging mode can be switched in real time, breaking the mutual interference limitation of the traditional same pile double gun charging, supporting mode free switching and independent operation of single gun charging and double gun charging, and realizing dynamic adjustment of the charging current according to the charging gun mode, improving the charging capacity of the charging pile and the charging rate of the whole vehicle, and matching the charging demand of different vehicles.

[0055] It can be understood that the charging current allocation method of the electric vehicle can be applied not only to the same pile double gun charging for the same electric vehicle, but also to the same pile multi-gun charging for the same electric vehicle, and can also be applied to two guns of two charging piles simultaneously supplying power to two charging interfaces on the same electric vehicle.

[0056] Figure 2 is a structural schematic diagram of the charging current allocation device of the electric vehicle provided by an exemplary embodiment of the present application, as Figure 2 shown, the charging current allocation device 2 of the electric vehicle includes: an acquisition module 21, which acquires the maximum allowed charging current of the battery system, the maximum output capability of the first charging gun, the maximum output capability of the second charging gun, and the maximum bearing current limit of the battery system hardware when it is detected that the electric vehicle is physically connected with the first charging gun and the second charging gun; a first allocation module 22, which allocates the maximum allowed charging current of the battery system in a first charging gun and a second charging gun according to the maximum output capability of the first charging gun and the maximum output capability of the second charging gun, and obtains the target current of the first charging gun and the target current of the second charging gun; a first value module 23, which takes the minimum value of the target current of the first charging gun, the maximum output capability of the first charging gun, and the maximum bearing current limit of the battery system hardware as the battery demand current of the first charging gun; a second value module 24, which takes the minimum value of the target current of the second charging gun, the maximum output capability of the second charging gun, and the maximum bearing current limit of the battery system hardware as the battery demand current of the second charging gun; and a second allocation module 25, which allocates the current of the first charging gun and the second charging gun based on the battery demand current of the first charging gun and the battery demand current of the second charging gun.

[0057] As a possible implementation, the charging current distribution device 2 of the electric vehicle can also be configured to: when it is detected that the electric vehicle is physically connected with any charging gun, taking the minimum value of the maximum allowed charging current of the battery system, the maximum output capability fed back by the charging gun, and the maximum bearing current limit of the battery system hardware as the required current of the battery system; wherein any charging gun refers to any of the first charging gun and the second charging gun.

[0058] As a possible implementation, the first distribution module 22 can be configured to: when the maximum bearing current limit of the battery system hardware is greater than the required current of the battery system, and the required current of the battery system is greater than the sum of the maximum output capability of the first charging gun and the maximum output capability of the second charging gun, based on the maximum allowed charging current of the battery system, the target current of the first charging gun and the target current of the second charging gun are obtained by equal proportion distribution according to the maximum output capability of the first charging gun and the maximum output capability of the second charging gun.

[0059] As a possible implementation, the first distribution module 22 can be configured to: when the maximum bearing current limit of the battery system hardware is greater than the required current of the battery system, the required current of the battery system is less than the sum of the maximum output capability of the first charging gun and the maximum output capability of the second charging gun, and the required current of the battery system is less than the maximum output capability of the first charging gun, and the required current of the battery system is less than the maximum output capability of the second charging gun, based on the maximum allowed charging current of the battery system, the target current of the first charging gun and the target current of the second charging gun are obtained by equal proportion distribution according to the maximum output capability of the first charging gun and the maximum output capability of the second charging gun.

[0060] As a possible implementation, the first distribution module 22 can be configured to: when the maximum bearing current limit of the battery system hardware is greater than the required current of the battery system, the required current of the battery system is less than the sum of the maximum output capability of the first charging gun and the maximum output capability of the second charging gun, and the required current of the battery system is greater than the maximum output capability of the first charging gun, and the required current of the battery system is less than the maximum output capability of the second charging gun, based on the maximum allowed charging current of the battery system, the target current of the first charging gun and the target current of the second charging gun are obtained by equal proportion distribution according to the maximum output capability of the first charging gun and the maximum output capability of the second charging gun.

[0061] As a possible implementation manner, the first distribution module 22 can be configured to: calculate a sum of the maximum output capability of the first charging gun and the maximum output capability of the second charging gun to obtain a total maximum output capability of the charging guns; calculate a maximum allowed charging current allocated to the first charging gun based on a proportion of the maximum output capability of the first charging gun in the total maximum output capability of the charging guns and the maximum allowed charging current of the battery system, so as to serve as a target current of the first charging gun; and calculate a maximum allowed charging current allocated to the second charging gun based on a proportion of the maximum output capability of the second charging gun in the total maximum output capability of the charging guns and the maximum allowed charging current of the battery system, so as to serve as a target current of the second charging gun.

[0062] As a possible implementation manner, the charging current distribution device 2 of the electric vehicle can also be configured to: when it is detected that the first charging gun or the second charging gun is not connected, send a parameter configuration request to the charging gun still connected, and obtain the maximum output capability fed back by the charging gun still connected; and perform charging current distribution on the charging gun still connected based on the maximum allowed charging current of the battery system, the maximum output capability fed back by the charging gun still connected, and the maximum bearing current limit of the hardware of the battery system.

[0063] As a possible implementation manner, the charging current distribution device 2 of the electric vehicle can also be configured to: based on the minimum temperature and the state of charge of the battery system, send the maximum allowed charging current of the battery system to the charging piles of the first charging gun and the second charging gun; wherein the maximum allowed charging current of the battery system is calculated by the battery management system based on the maximum capability of the battery system and the number of parallel branches of the battery system; and the charging piles feed back the maximum output capability of the first charging gun and the maximum output capability of the second charging gun to the battery management system based on the received maximum allowed charging current of the battery system.

[0064] In some embodiments, the charging current distribution method of the electric vehicle can be applied to an electric vehicle, the electric vehicle comprising: a battery system configured to be connected to a charging pile for charging; and a charging current distribution device of the electric vehicle, which is in communication connection with the battery system and is configured to execute the charging current distribution method of the electric vehicle, so that the electric vehicle adjusts the battery demand current when connected to the charging pile, breaks the limitation of mutual interference of the same-pile double-gun charging, and adapts the free switching and independent allowance of the single-gun mode and the double-gun mode, thereby improving the charging capability of the charging pile and the charging rate of the whole vehicle.

[0065] An electronic device, comprising: a processor; a memory for storing processor-executable instructions; and the processor, configured to execute the charging current distribution method of the electric vehicle provided in the embodiments.

[0066] Below, an electronic device according to embodiments of the present application will be described with reference to Figure 3 The electronic device can be either one or both of the first and second devices, or a stand-alone device independent of them, which can communicate with the first and second devices to receive the acquired input signals therefrom.

[0067] Figure 3 A block diagram of an electronic device according to embodiments of the present application is illustrated.

[0068] As Figure 3 shown, the electronic device 30 includes one or more processors 31 and a memory 32.

[0069] The processor 31 can be a central processing unit (CPU) or other form of processing unit having data processing and / or instruction executing capabilities, and can control other components in the electronic device 30 to perform desired functions.

[0070] The memory 32 can include one or more computer program products that can include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory, for example, can include random access memory (RAM), cache memory, and / or the like. The non-volatile memory, for example, can include read only memory (ROM), hard disk, flash memory, and / or the like. One or more computer program instructions can be stored on the computer-readable storage media, which the processor 31 can execute to implement the charging current distribution method of the electric vehicle according to embodiments of the present application described above and / or other desired functions. Various contents such as input signals, signal components, noise components, and the like can also be stored in the computer-readable storage media.

[0071] In one example, the electronic device 30 can further include an input device 33 and an output device 34, which are interconnected through a bus system and / or other form of connection mechanism (not shown).

[0072] When the electronic device is a stand-alone device, the input device 33 can be a communication network connector for receiving the acquired input signals from the first and second devices.

[0073] In addition, the input device 33 can further include, for example, a keyboard, a mouse, and the like.

[0074] The output device 34 can output various information including the determined distance information, direction information, and the like to the outside. The output device 34 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0075] Of course, for simplicity, Figure 3 Only some of the components of the electronic device 30 related to the present application are shown in the figure, and components such as buses, input / output interfaces, and the like are omitted. In addition to these, the electronic device 30 can include any other appropriate components according to the specific application.

[0076] The computer program product can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++, etc., and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code can execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's device and partly on a remote computing device or entirely on the remote computing device or server. It will be appreciated that a person of ordinary skill in the art can modify the embodiments of the present application described above. These modifications are intended to be within the scope of the present application.

[0077] A computer readable storage medium, the storage medium storing a computer program, the computer program being used to execute the charging current distribution method of the electric vehicle provided by the embodiments of the present application.

[0078] The computer readable storage medium can take the form of one or more combinations of any of the following: a computer readable signal medium or a computer readable storage medium. A computer readable storage medium can include, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or apparatus, or any suitable combination of the above. More specific examples (a non-exhaustive list) of the computer readable storage medium include an electrical connection having one or more wires, a portable disc, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0079] The above description is given for illustrative and descriptive purposes. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain modifications, permutations, additions, and sub-combinations thereof.

Claims

1. A method of distributing charging current for an electric vehicle, characterized by, An electric vehicle includes a battery system, and a charging current distribution method of the electric vehicle includes: When it is detected that the electric vehicle is physically connected with both the first charging gun and the second charging gun, obtaining a maximum allowed charging current of the battery system, a maximum output capability of the first charging gun, a maximum output capability of the second charging gun, and a maximum bearing current limit of the battery system hardware; the maximum allowed charging current of the battery system is a safe charging current upper limit calculated by the battery management system according to the current state of the battery, and the maximum bearing current limit of the battery system hardware is determined by the physical characteristics of the battery; based on the maximum allowed charging current of the battery system, the maximum output capability of the first charging gun and the maximum output capability of the second charging gun are proportionally distributed, and the target current of the first charging gun and the target current of the second charging gun are obtained; taking the minimum value of the target current of the first charging gun, the maximum output capability of the first charging gun and the maximum bearing current limit of the battery system hardware as the battery demand current of the first charging gun; taking the minimum value of the target current of the second charging gun, the maximum output capability of the second charging gun and the maximum bearing current limit of the battery system hardware as the battery demand current of the second charging gun; based on the battery demand current of the first charging gun and the battery demand current of the second charging gun, the current of the first charging gun and the second charging gun is distributed; When it is detected that the electric vehicle is physically connected with any charging gun, taking the minimum value of the maximum allowed charging current of the battery system, the maximum output capability of the charging gun and the maximum bearing current limit of the battery system hardware as the demand current of the battery system; wherein the any charging gun represents any of the first charging gun and the second charging gun.

2. The charging current allocation method for an electric vehicle according to claim 1, characterized by, based on the maximum allowed charging current of the battery system, the maximum output capability of the first charging gun and the maximum output capability of the second charging gun are proportionally distributed, and the target current of the first charging gun and the target current of the second charging gun are obtained, including: When the maximum bearing current limit of the battery system hardware is greater than the demand current of the battery system, and the demand current of the battery system is greater than the sum of the maximum output capability of the first charging gun and the maximum output capability of the second charging gun, based on the maximum allowed charging current of the battery system, the maximum output capability of the first charging gun and the maximum output capability of the second charging gun are proportionally distributed, and the target current of the first charging gun and the target current of the second charging gun are obtained.

3. The charging current allocation method for an electric vehicle according to claim 1, characterized by, based on the maximum allowed charging current of the battery system, the maximum output capability of the first charging gun and the maximum output capability of the second charging gun are proportionally distributed, and the target current of the first charging gun and the target current of the second charging gun are obtained, including: When the maximum bearing current limit of the battery system hardware is greater than the demand current of the battery system, the demand current of the battery system is less than the sum of the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun, and the demand current of the battery system is less than the maximum output capacity of the first charging gun and the demand current of the battery system is less than the maximum output capacity of the second charging gun, the target current of the first charging gun and the target current of the second charging gun are obtained by equal proportion allocation based on the maximum allowed charging current of the battery system, the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun.

4. The charging current allocation method for an electric vehicle according to claim 1, characterized by, The target current of the first charging gun and the target current of the second charging gun are obtained by equal proportion allocation based on the maximum allowed charging current of the battery system, the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun, including: When the maximum bearing current limit of the battery system hardware is greater than the demand current of the battery system, the demand current of the battery system is less than the sum of the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun, and the demand current of the battery system is greater than the maximum output capacity of the first charging gun, and the demand current of the battery system is less than the maximum output capacity of the second charging gun, the target current of the first charging gun and the target current of the second charging gun are obtained by equal proportion allocation based on the maximum allowed charging current of the battery system, the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun.

5. The charging current allocation method for an electric vehicle according to claim 1, characterized by, The target current of the first charging gun and the target current of the second charging gun are obtained by equal proportion allocation based on the maximum allowed charging current of the battery system, the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun, including: The sum of the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun is calculated to obtain the total maximum output capacity of the charging gun; The maximum allowed charging current allocated to the first charging gun is calculated as the target current of the first charging gun based on the proportion of the maximum output capacity of the first charging gun in the total maximum output capacity of the charging gun and the maximum allowed charging current of the battery system; The maximum allowed charging current allocated to the second charging gun is calculated as the target current of the second charging gun based on the proportion of the maximum output capacity of the second charging gun in the total maximum output capacity of the charging gun and the maximum allowed charging current of the battery system.

6. The charging current allocation method for an electric vehicle according to claim 1, characterized by, The charging current allocation method of the electric vehicle further includes: When it is detected that the first charging gun or the second charging gun is not connected, a parameter configuration request is sent to the charging gun still connected to obtain the maximum output capacity fed back by the charging gun still connected; The charging current allocation is performed on the charging gun still connected based on the maximum allowed charging current of the battery system, the maximum output capacity fed back by the charging gun still connected and the maximum bearing current limit of the battery system hardware.

7. The charging current allocation method for an electric vehicle according to claim 1, characterized by, The charging current allocation method of the electric vehicle further includes: sending, to a charging pile of the first charging gun and the second charging gun, a maximum allowed charging current of the battery system based on a minimum temperature and a state of charge of an electric core of the battery system, wherein the maximum allowed charging current of the battery system is calculated by a battery management system based on a maximum capacity of the battery system and a number of parallel branches of the battery system; feeding back, by the charging pile, maximum output capacities of the first charging gun and the second charging gun to the battery management system based on the received maximum allowed charging current of the battery system.

8. A charging current distribution device for an electric vehicle, characterized by comprising: An electric vehicle includes a battery system, and a charging current distribution device of the electric vehicle includes: an acquisition module configured to acquire a maximum allowed charging current of the battery system, a maximum output capacity of the first charging gun, a maximum output capacity of the second charging gun, and a maximum bearing current limit of hardware of the battery system when detecting that the electric vehicle is physically connected to the first charging gun and the second charging gun, wherein the maximum allowed charging current of the battery system is a safe upper limit of a charging current calculated by the battery management system according to a current state of the battery, and the maximum bearing current limit of the hardware of the battery system is determined by physical characteristics of the battery; a first distribution module configured to perform equal proportion distribution according to the maximum output capacity of the first charging gun and the maximum output capacity of the second charging gun based on the maximum allowed charging current of the battery system, to obtain a target current of the first charging gun and a target current of the second charging gun; a first value acquisition module configured to take a minimum value among the target current of the first charging gun, the maximum output capacity of the first charging gun, and the maximum bearing current limit of the hardware of the battery system as a battery demand current of the first charging gun; a second value acquisition module configured to take a minimum value among the target current of the second charging gun, the maximum output capacity of the second charging gun, and the maximum bearing current limit of the hardware of the battery system as a battery demand current of the second charging gun; a second distribution module configured to perform current distribution on the first charging gun and the second charging gun based on the battery demand current of the first charging gun and the battery demand current of the second charging gun; The charging current distribution device of the electric vehicle is further configured to take a minimum value among the maximum allowed charging current of the battery system, the maximum output capacity fed back by the charging gun, and the maximum bearing current limit of the hardware of the battery system as a demand current of the battery system when detecting that the electric vehicle is physically connected to any charging gun, wherein any charging gun refers to any one of the first charging gun and the second charging gun.

9. An electric vehicle characterized by comprising: The electric vehicle includes: a battery system configured to be connected to a charging pile for charging; The charging current distribution device of the electric vehicle is in communication connection with the battery system.

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