An AC charging method and system for new energy vehicles

Abstract

The present invention discloses an AC charging method and system for new energy vehicles. The method comprises: in response to a selected charging mode, a vehicle controller controls a charger to charge a battery. The charging modes include a standard charging mode, a healthy charging mode, a scheduled charging mode, and / or a charging cutoff point setting mode. The healthy charging mode refers to the vehicle controller calculating the charging current based on a comprehensive consideration of the ambient temperature and the temperature of key vehicle components, and controlling the charger to charge the power battery according to the charging current. The present invention rationally controls charging performance, improves component performance, increases service life, improves charging efficiency, and enhances vehicle safety, and is of great significance to promoting the promotion and development of new energy vehicles.

Description

Technical Field

[0001] The present invention relates to the technical field of AC charging of new energy vehicles, and in particular to an AC charging method and system for new energy vehicles. Background Art

[0002] The statements in this section merely mention background art related to the present invention and do not necessarily constitute prior art.

[0003] In recent years, new energy vehicles have achieved rapid development with the support of national and local policies. Most types of new energy vehicles require external charging, and charging technology has made great progress, and charging facilities have also been improved.

[0004] In the automotive industry, technological advancements and developments in new energy vehicles have addressed some environmental and energy challenges, but certain technical limitations remain. There are two main types of external charging: AC and DC. Each charging method must consider the reliability and safety of the battery and, ultimately, the system itself.

[0005] Currently, most private car users use AC charging most of the time, with the mainstream onboard charger being 6.6kW. Due to varying vehicle operating environments, this inevitably causes temperature rise in the charger, power battery, and other systems, requiring the cooling system to activate in most operating conditions. This system temperature rise degrades component performance, impacting service life and vehicle safety. The temperature of the charger and power battery also impacts their operating efficiency, and the cooling system's activation can also reduce charging efficiency. Summary of the Invention

[0006] In order to address the deficiencies of the prior art, the present invention provides an AC charging method and system for new energy vehicles; rationally controlling charging performance can improve component performance, increase service life, improve charging efficiency, and enhance vehicle safety, which is of great significance to promoting the promotion and development of new energy vehicles.

[0007] In a first aspect, the present invention provides a method for AC charging of a new energy vehicle;

[0008] A new energy vehicle AC charging method, comprising:

[0009] In response to the selected charging mode, the vehicle controller controls the charger to charge the battery;

[0010] The charging mode includes: standard charging mode, healthy charging mode, scheduled charging mode and / or charging cut-off point setting mode;

[0011] Among them, the healthy charging mode means that the vehicle controller calculates the charging current by comprehensively considering the ambient temperature and the temperature of key components of the vehicle, and controls the charger to charge the power battery according to the charging current.

[0012] In a second aspect, the present invention provides an AC charging system for new energy vehicles;

[0013] A new energy vehicle AC charging system includes: a vehicle controller;

[0014] In response to the selected charging mode, the vehicle controller controls the charger to charge the battery;

[0015] The charging mode includes: standard charging mode, healthy charging mode, scheduled charging mode and / or charging cut-off point setting mode;

[0016] Among them, the healthy charging mode means that the vehicle controller calculates the charging current by comprehensively considering the ambient temperature and the temperature of key components of the vehicle, and controls the charger to charge the power battery according to the charging current.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] Rationalizing the AC charging solution for new energy vehicles can improve system performance, reliability, lifespan, and charging efficiency. The AC charging system is controlled and managed through the vehicle controller unit (VCU), power battery management system, charger, cooling system, and audio and video entertainment system (DVD). This enhances the user experience, improves system performance and reliability, enhances vehicle safety, and improves charging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] Figure 1 This is a schematic diagram of the hardware connection relationship of Example 1. DETAILED DESCRIPTION

[0021] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0023] In the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0024] All data in this embodiment is obtained in compliance with laws and regulations and based on the consent of the user, and is used legally.

[0025] The AC charging management solution of the present invention selects the charging mode through DVD: "Standard Charging" and "Healthy Charging"; the AC charging management solution of the present invention selects "Scheduled Charging" through DVD and sets the charging start time and stop time. The AC charging management solution of the present invention sets the charging cutoff SOC through DVD. When the AC charging management solution of the present invention selects the "Healthy Charging" mode, the system will actively control the charging current according to the ambient temperature, power battery temperature, charger temperature, etc. The present invention mainly relates to a vehicle controller (VCU), a large color screen entertainment system (DVD), a battery management system, a charger, a cooling system, etc. The rated output power of the charger is P. The user can select the charging mode through DVD before and during charging: "Standard Charging" and "Healthy Charging".

[0026] Example 1

[0027] This embodiment provides a new energy vehicle AC charging method;

[0028] A new energy vehicle AC charging method, comprising:

[0029] In response to the selected charging mode, the vehicle controller controls the charger to charge the battery;

[0030] The charging mode includes: standard charging mode, healthy charging mode, scheduled charging mode and / or charging cut-off point setting mode;

[0031] Among them, the healthy charging mode means that the vehicle controller calculates the charging current by comprehensively considering the ambient temperature and the temperature of key components of the vehicle, and controls the charger to charge the power battery according to the charging current.

[0032] Furthermore, when the selected charging mode is the standard charging mode, the difference between the maximum allowable charging power of the battery output by the battery management system and the rated output power of the charger is determined;

[0033] If the maximum allowable charging power of the battery is greater than the rated output power of the charger, the vehicle controller controls the charger to charge according to the rated output power of the charger as the output target;

[0034] If the maximum allowable charging power of the battery is less than the rated output power of the charger, the vehicle controller controls the charger to charge according to the maximum allowable charging power of the battery as the output target.

[0035] Furthermore, when the selected charging mode is the standard charging mode, the cooling system is turned on or off according to the temperature of key components of the vehicle.

[0036] Furthermore, if Figure 1 As shown, the vehicle controller is connected to the charger, cooling system, ambient temperature sensor, low-voltage power supply system, battery management system and DVD respectively; the cooling system includes: a cooling water pump or a cooling fan.

[0037] Furthermore, the key components of the automobile include: a charger, a low-voltage power supply system, and a battery.

[0038] The low-voltage power supply system refers to a DC-DC converter, for example, a system that converts high voltage to 12V low voltage.

[0039] Furthermore, when the selected charging mode is the healthy charging mode and the ambient temperature is within a set range (e.g., below 25°C), the vehicle controller first sets a first threshold value (e.g., 6kW) of charging power according to the ambient temperature within the rated output power range of the charger; the first threshold value is less than the rated power of the charger;

[0040] Based on the ambient temperature and the temperature of key vehicle components, calculate the power loss of the charger, power battery, low-voltage power supply system, cooling fan, and cooling water pump at different temperatures, and sum all the power losses. Determine the corresponding charging power based on the minimum summed result, and use the resulting charging power as the second threshold for charging power.

[0041] Selecting a minimum threshold from the first threshold and the second threshold;

[0042] Compare the minimum threshold with the set minimum charging power and select the maximum value between the two;

[0043] The selected maximum value is used as the requested charging power;

[0044] According to the requested charging power, the requested charging current is calculated, and the charger is controlled to charge the power battery according to the requested charging current.

[0045] It should be understood that in an environment with a high ambient temperature, if the charging power is large, the temperature of the charger and the battery will rise rapidly. The rapid temperature rise of the charger can easily cause the cooling system to work at a high load, increase the energy consumption of the low-voltage system, and the rapid temperature rise of the battery will reduce safety.

[0046] Furthermore, when the selected charging mode is the healthy charging mode and the ambient temperature is higher than the third set threshold (for example, 35°C), the temperature rise rate of the charger and the power battery is monitored. If the temperature rise rate is higher than the fourth set threshold (for example, 0.5°C / s), the current charging power is multiplied by a coefficient less than 1 (for example, 0.8, 0.7, 0.6) to obtain the optimized charging power, and charging is performed according to the optimized charging power.

[0047] Furthermore, when the user selects the healthy charging mode, the system will control the output power of the charging motor within the range of the maximum allowable charging power of the battery and the rated output power of the charger (the smaller of the two), based on the ambient temperature, the temperature of key components (charger temperature, low-voltage power supply system temperature, battery temperature, etc.), and the temperature rise rate of key components. By controlling the charging power, the temperature rise of the charger, power battery and other systems is minimized to prevent the temperature of key components from being too high, and the cooling system is reduced or avoided from participating in the operation (in this mode, the cooling system is still turned on or off according to the temperature of key components, but by actively controlling the charging power, the heat generated by key components is reduced to prevent key components from reaching the temperature threshold for turning on the cooling system, or preventing key components from reaching the temperature threshold for turning on the water pump or turning on the fan at a higher speed).

[0048] The vehicle controller is responsible for collecting ambient temperature, receiving the real-time temperature of the power battery system, low-voltage power supply system, and charger system, and controlling the operation of the cooling system according to the temperature of each system component. At the same time, it calculates the requested charging current based on the environmental conditions and the status of each system component, and sends it to the charger. The charger executes according to the request of the vehicle controller and feeds back the actual execution status to the vehicle controller.

[0049] In healthy charging mode, the vehicle controller first sets the charging power threshold based on the ambient temperature within the charger's rated output power range. This prevents high charging power requests even when the ambient temperature is high, which could cause the system temperature to rise rapidly and cause the cooling fan and cooling water pump to operate at high speed, increasing system energy consumption. When the ambient temperature is below a certain level, the requested charging power is based on the charger's rated power. As the temperature rises, the requested charging power is gradually reduced, as shown in Table 1. (T1 < T2 < ... < Tn, Prated > P1 > ... > Pn).

[0050] Table 1

[0051]

[0052] The vehicle controller internally stores the efficiency of the charger, power battery, and low-voltage power supply system at different temperatures (a two-dimensional table with temperature on the horizontal axis and load power on the vertical axis), as well as the power consumption at different cooling fan and cooling water pump speeds. Based on the real-time temperature input and the principle of minimizing power loss (power loss of the charger, power battery, and low-voltage power supply system + power consumption of the cooling fan and cooling water pump), the optimal charging power is calculated as the second charging power threshold.

[0053] The smaller of the first and second threshold values of the charging power and the set minimum charging power is taken as the requested charging power, and the requested charging current is calculated based on the requested charging power and sent to the charger.

[0054] When the ambient temperature is higher than a certain value, the temperature rise rate of the charger and power battery is monitored. When the temperature rises above the preset threshold, the current charging power is multiplied by a coefficient less than 1. The faster the temperature rise, the smaller the coefficient, until the preset minimum charging power is reached.

[0055] Furthermore, when the selected charging mode is the scheduled charging mode, the vehicle controller controls the charger to charge the power battery according to the scheduled charging start time, and controls the charger to stop charging the power battery according to the scheduled charging end time.

[0056] Furthermore, the scheduled charging mode includes a single scheduled charging mode and a cyclic scheduled charging mode; a single scheduled charging mode is only valid for one charge, while a cyclic scheduled charging mode is valid for a long time.

[0057] Users can choose to enable or disable "Scheduled Charging" in the DVD. Scheduled charging can be selected as "Single Schedule" or "Recurring Schedule." A single schedule is valid only for one charge, while a recurring schedule is valid for a long time. The scheduled charging interface allows you to set the charging start time and charging end time, and the charging start and end times can span a day. Once the user selects scheduled charging, charging will start at the scheduled charging start time and stop when charging is completed or at the charging end time. The selected charging mode is valid during scheduled charging.

[0058] Further, when the selected charging mode is the charging cut-off point setting mode, determining whether the charging cut-off point is enabled or disabled;

[0059] If the charging cut-off point is disabled, the charging process ends when the battery is charged to 100% by default;

[0060] If the charging cut-off point is enabled, charging stops when the charging cut-off SOC (State of Charge of the power battery) is reached.

[0061] Among them, the charging cut-off point can be adjusted in a gradient of 5%.

[0062] Users can enable or disable the charging cutoff point setting in the DVD. When disabled, charging stops at 100% by default (if scheduled charging, the charging end time condition is reached first, the charging will also stop); when enabled, charging stops when the set charging cutoff SOC is reached (if scheduled charging, the charging end time condition is reached first, the charging will also stop); the cutoff point setting can be set in a gradient of 5%, between the current power level and 100% (the minimum setting is 60% and the maximum setting is 100%), and the charging cutoff point interface displays the increase in the remaining driving range (the vehicle controller calculates the increase in the remaining range based on the current SOC and the set charging cutoff SOC). The charging cutoff point setting is valid for "standard charging" mode, "healthy charging" mode, and scheduled charging.

[0063] Example 2

[0064] This embodiment provides an AC charging system for new energy vehicles;

[0065] A new energy vehicle AC charging system includes: a vehicle controller;

[0066] In response to the selected charging mode, the vehicle controller controls the charger to charge the battery;

[0067] The charging mode includes: standard charging mode, healthy charging mode, scheduled charging mode and / or charging cut-off point setting mode;

[0068] Among them, the healthy charging mode means that the vehicle controller calculates the charging current by comprehensively considering the ambient temperature and the temperature of key components of the vehicle, and controls the charger to charge the power battery according to the charging current.

[0069] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A new energy vehicle AC charging method, characterized in that: include: In response to the selected charging mode, the vehicle controller controls the charger to charge the battery; The charging mode includes: standard charging mode, healthy charging mode, scheduled charging mode and / or charging cut-off point setting mode; Among them, the healthy charging mode means that the vehicle controller calculates the charging current by comprehensively considering the ambient temperature and the temperature of key components of the vehicle, and controls the charger to charge the power battery according to the charging current; When the selected charging mode is the healthy charging mode and the ambient temperature is within the set range, the vehicle controller first sets a first threshold of the charging power according to the ambient temperature within the rated output power range of the charger; the first threshold is less than the rated power of the charger; Based on the ambient temperature and the temperature of key vehicle components, calculate the power loss of the charger, power battery, low-voltage power supply system, cooling fan, and cooling water pump at different temperatures, and sum all the power losses. Determine the corresponding charging power based on the minimum summed result, and use the resulting charging power as the second threshold for charging power. Selecting a minimum threshold from the first threshold and the second threshold; Compare the minimum threshold with the set minimum charging power and select the maximum value between the two; The selected maximum value is used as the requested charging power; Calculate the requested charging current according to the requested charging power, and control the charger to charge the power battery according to the requested charging current; The key automotive components include: charger, low-voltage power supply system and battery.

2. A new energy vehicle AC charging method as claimed in claim 1, characterized in that: When the selected charging mode is the standard charging mode, determine the size of the maximum allowable charging power of the battery output by the battery management system and the rated output power of the charger; If the maximum allowable charging power of the battery is greater than the rated output power of the charger, the vehicle controller controls the charger to charge according to the rated output power of the charger as the output target; If the maximum allowable charging power of the battery is less than the rated output power of the charger, the vehicle controller controls the charger to charge according to the maximum allowable charging power of the battery as the output target.

3. The AC charging method for a new energy vehicle according to claim 1, wherein: When the selected charging mode is the healthy charging mode and the ambient temperature is higher than the third set threshold, the temperature rise rate of the charger and the power battery is monitored. If the temperature rise rate is higher than the fourth set threshold, the current charging power is multiplied by a coefficient less than 1 to obtain the optimized charging power, and charging is carried out according to the optimized charging power.

4. The AC charging method for a new energy vehicle according to claim 1, wherein: When the selected charging mode is the scheduled charging mode, the vehicle controller controls the charger to charge the power battery according to the scheduled charging start time, and controls the charger to stop charging the power battery according to the scheduled charging end time.

5. The AC charging method for a new energy vehicle according to claim 1, wherein: The scheduled charging mode includes a single scheduled charging mode and a cyclic scheduled charging mode; a single scheduled charging mode is only valid for one charge, while a cyclic scheduled charging mode is valid for a long time.

6. The AC charging method for a new energy vehicle according to claim 1, wherein: When the selected charging mode is a charging cutoff point setting mode, determining whether the charging cutoff point is enabled or disabled; If the charging cut-off point is disabled, the charging process ends when the battery reaches 100% by default; If the charging cut-off point is enabled, charging is stopped when the state of charge of the power battery at the charging cut-off point is reached; wherein the charging cut-off point is adjusted according to a gradient.

7. The AC charging method for a new energy vehicle according to claim 1, wherein: When the selected charging mode is standard charging mode, the cooling system is turned on or off according to the temperature of key components of the vehicle.

8. An AC charging system for a new energy vehicle, based on the AC charging method for a new energy vehicle according to any one of claims 1 to 7, characterized in that: include: Vehicle controller; In response to the selected charging mode, the vehicle controller controls the charger to charge the battery; The charging mode includes: standard charging mode, healthy charging mode, scheduled charging mode and / or charging cut-off point setting mode; Among them, the healthy charging mode means that the vehicle controller calculates the charging current by comprehensively considering the ambient temperature and the temperature of key components of the vehicle, and controls the charger to charge the power battery according to the charging current.

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