A solar charging method and device for new energy vehicles

Abstract

The present application discloses a solar charging method and device for new energy vehicles, which relate to the field of automobile technology. The solar charging method for new energy vehicles includes the following steps: obtaining the photoelectric conversion efficiency of a solar photovoltaic panel; if the photoelectric conversion efficiency of the solar photovoltaic panel is greater than or equal to a photoelectric conversion efficiency threshold, obtaining the remaining capacity of a battery pack; determining to perform solar charging on a power battery pack and / or an electrical device based on a relationship between the remaining capacity of the battery pack and a capacity threshold. By determining to perform solar charging on a power battery pack and / or an electrical device based on a relationship between the photoelectric conversion efficiency of the solar photovoltaic panel, the remaining capacity of the battery pack and the capacity threshold, the method can perform solar charging on a new energy vehicle when ground charging equipment is insufficient, the photoelectric conversion efficiency is sufficient, and the battery power is insufficient, thereby charging the vehicle in a timely manner and reducing the charging pressure on the new energy vehicle.

Description

Technical Field

[0001] The present application relates to the field of automotive technology, and in particular to a solar charging method and device for new energy vehicles. Background Art

[0002] Ground-based DC charging stations, AC charging stations, and wireless charging devices can charge the entire vehicle by connecting it to the vehicle. However, these three charging methods rely on ground-based charging equipment or ground-based power supply equipment, making them unsuitable for outdoor charging scenarios where ground-based charging equipment or ground-based power supply equipment is lacking. In scenarios where outdoor charging equipment is unavailable, or when demand for charging equipment surges during holidays, vehicles cannot be charged in a timely manner, impacting the charging experience. Summary of the Invention

[0003] The present application provides a solar charging method and device for new energy vehicles to solve the problem of being unable to charge the vehicle in a timely manner.

[0004] In a first aspect, the present application provides a method for solar charging of a new energy vehicle, comprising the following steps:

[0005] If the photoelectric conversion efficiency of the solar photovoltaic panel is greater than or equal to the photoelectric conversion efficiency threshold, the remaining capacity of the battery pack is obtained;

[0006] Based on the relationship between the remaining capacity of the battery pack and the capacity threshold, it is determined that the power battery pack and / or the power-consuming device are to be charged with solar energy.

[0007] This application determines the solar charging of the power battery pack and / or power-consuming device through the relationship between the photoelectric conversion efficiency of the solar photovoltaic panel, the remaining capacity of the battery pack and the capacity threshold. It can perform solar charging for new energy vehicles when there is insufficient ground charging equipment, the photoelectric conversion efficiency is sufficient, and the battery power is insufficient, so as to charge the vehicle in time and reduce the charging pressure of new energy vehicles.

[0008] Typically, solar charging can be performed when the remaining capacity of the battery pack is below a capacity threshold. The remaining capacity of the battery pack can typically be set to a capacity threshold of 20% to 90%. Solar charging of the battery pack or electrical device begins when the remaining capacity of the battery pack is below 20% of the capacity threshold. This is because solar charging has several drawbacks when the remaining capacity of the battery pack is below 20% of the capacity threshold, or even lower, such as 10%. For example, charging requires a large amount of energy and takes a long time, which affects the vehicle's range. If the solar charging progress is slower than the vehicle's power consumption rate, the vehicle may quickly run out of power, affecting the driving experience. However, starting solar charging when the remaining capacity of the battery pack is above 90% of the capacity threshold means that there is insufficient space for energy to be fed back during braking or downhill driving. Therefore, a battery pack remaining capacity of 20% to 90% of the capacity threshold is generally more appropriate. More preferably, a battery pack remaining capacity of 50% to 70% of the capacity threshold can reduce the impact on vehicle range while providing sufficient space for energy feedback.

[0009] It should be noted that before photovoltaic charging, it is necessary to first determine whether the photovoltaic system can work normally and without faults, and then determine whether the working status of the entire vehicle is normal and without faults. Only when both the photovoltaic system and the entire vehicle are fault-free can photovoltaic charging be carried out according to the corresponding conditions.

[0010] In some embodiments, obtaining the photoelectric conversion efficiency of the solar photovoltaic panel includes:

[0011] Obtain light intensity and the angle between the incident direction of sunlight and the photovoltaic panel;

[0012] The photoelectric conversion efficiency of the solar photovoltaic panel is obtained based on the light intensity and the angle between the incident direction of sunlight and the photovoltaic panel.

[0013] The photoelectric conversion efficiency of a solar photovoltaic panel is related to the light intensity and the angle between the incident direction of sunlight and the photovoltaic panel. The specific calculation formula for the photoelectric conversion efficiency is:

[0014] η=V*I*F / (P*S),

[0015] Among them, η is the photoelectric conversion efficiency, V is the open circuit voltage, which is the voltage when the output current of the solar photovoltaic panel is 0, I is the short-circuit current, which is the current that the solar photovoltaic panel can output through a short-circuit load, F is the fill factor, which is the ratio of the output power of the solar photovoltaic panel to the product of the short-circuit current and the open-circuit voltage, P is the energy density of the incident sunlight, that is, the light intensity, and S is the surface area of ​​the solar photovoltaic panel converted to the area perpendicular to the incident direction of the sunlight.

[0016] Usually the angle is in the range of 15° to 85°, and the light intensity is in the range of 600 to 1000W / m 2Within this range, solar photovoltaic panels have relatively good photoelectric conversion efficiency.

[0017] In some embodiments, determining to perform solar charging on the power battery pack and / or the power-consuming device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes:

[0018] Get the current output by the solar panel and the rated charging current of the battery pack;

[0019] If the ratio of the current output by the solar panel to the rated charging current of the battery pack is greater than the ratio threshold;

[0020] Based on the relationship between the remaining capacity of the battery pack and the capacity threshold, it is determined that the power battery pack and / or the power-consuming device are to be charged with solar energy.

[0021] Determining whether to charge a vehicle with solar power based on the ratio of the solar panel output current to the battery pack's rated charging current can improve solar charging efficiency. Charging a new energy vehicle can only be performed when the solar panel output current is sufficient and the battery charging time is within the appropriate range. This improves solar charging efficiency and reduces inefficient and long-lasting solar charging. The typical threshold for the ratio of the solar panel output current to the battery pack's rated charging current is 5% to 10%.

[0022] In some embodiments, determining to perform solar charging on the power battery pack and / or the power-consuming device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes:

[0023] Obtain the bus voltage value of the battery pack and the photovoltaic boost output voltage value;

[0024] If the bus voltage value of the battery pack is less than the photovoltaic boost output voltage value, it is determined that the power battery pack and / or the electrical device will be charged with solar energy according to the relationship between the remaining capacity of the battery pack and the capacity threshold.

[0025] Usually, only devices with higher voltage values ​​can charge devices with lower voltage values. Therefore, by obtaining the bus voltage value of the battery pack and the photovoltaic boost output voltage value and comparing them, photovoltaic charging can only be achieved when the bus voltage value of the battery pack is less than the photovoltaic boost output voltage value, that is, the photovoltaic boost output voltage value is high and the bus voltage value of the battery pack is low.

[0026] It should be noted that the working principle of photovoltaic boost is to increase the output voltage of the photovoltaic system to the battery pack bus voltage through a boost DC / DC voltage converter.

[0027] In some embodiments, obtaining the bus voltage value and photovoltaic boost output voltage value of the battery pack includes:

[0028] Get the output voltage of the solar photovoltaic panel and the photovoltaic boost input voltage threshold;

[0029] If the output voltage of the solar photovoltaic panel is greater than or equal to the photovoltaic boost input voltage threshold, the bus voltage value of the battery pack and the photovoltaic boost output voltage value are obtained.

[0030] Photovoltaic boost has a certain operating voltage range. Only when the output voltage of the solar photovoltaic panel is greater than or equal to the photovoltaic boost input voltage threshold, that is, the minimum value of the range, can photovoltaic boost be used to charge the battery pack. Usually, the minimum photovoltaic boost input voltage is the lowest output voltage of the photovoltaic system.

[0031] In some embodiments, determining to perform solar charging on the power battery pack and / or the power-consuming device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes:

[0032] Get the discharge status of the battery pack;

[0033] If the battery pack is in a non-discharging state, it is determined that the power battery pack and / or the electrical device is to be solar-charged based on the relationship between the remaining capacity of the battery pack and the capacity threshold.

[0034] The battery pack has a charging state and a discharging state, so it is necessary to obtain the discharge state of the battery pack. The battery pack can only be charged in the non-discharging state. It should be noted that solar charging can be charged in parking mode or driving mode. When charging in parking mode, the battery pack usually discharges when the air conditioner is turned on. In this case, photovoltaic power can be used to power the air conditioner, and the excess power is used to power the battery pack, and the battery pack does not power the air conditioner alone. When charging in driving mode, the battery pack usually needs to provide energy for the vehicle power and the air conditioning system. In order to charge the battery pack, the vehicle power and air conditioning energy consumption can be provided by solar energy, and the battery pack is only charged.

[0035] In some embodiments, determining to perform solar charging on the power battery pack and / or the power-consuming device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes:

[0036] Get the charging status of the battery pack;

[0037] If the battery pack is in a non-charging state, it is determined that the power battery pack and / or the power device are to be solar-charged based on the relationship between the remaining capacity of the battery pack and the capacity threshold.

[0038] Since there are many ways to charge the battery pack, such as charging pile charging, wireless charging, energy feedback charging and photovoltaic charging, but only one charging method can be used at a time, it is necessary to determine whether the battery pack has other forms of charging before solar charging. If not, solar charging can be used.

[0039] In some embodiments, determining to perform solar charging on the power battery pack and / or the power-consuming device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes:

[0040] If the remaining capacity of the battery pack is less than the first capacity threshold, the battery pack is charged by solar energy;

[0041] Get the remaining capacity of the battery pack;

[0042] If the remaining capacity of the battery pack is greater than a second capacity threshold, stopping solar charging of the battery pack;

[0043] The second capacity threshold is greater than the first capacity threshold.

[0044] When the remaining capacity of the battery pack is less than the first capacity threshold, it indicates that the current remaining capacity of the battery pack may affect the driving range and the battery pack needs to be charged with solar energy. When the remaining capacity of the battery pack after charging is greater than the second capacity threshold, it indicates that the remaining capacity of the battery pack does not affect the driving range. At this time, storage space is reserved for energy feedback and solar charging of the battery pack is stopped. Typically, the first capacity threshold is 30% to 50% of the total battery pack capacity, and the second capacity threshold is 60% to 90% of the total battery pack capacity.

[0045] In some embodiments, determining to perform solar charging on the power battery pack and / or the power-consuming device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes:

[0046] If the remaining capacity of the battery pack is less than the third capacity threshold, solar charging is prioritized for the battery pack;

[0047] If the remaining capacity of the battery pack is greater than the fourth capacity threshold, solar charging is prioritized for the electrical device;

[0048] If the remaining capacity of the battery pack is greater than or equal to the third capacity threshold and less than or equal to the fourth capacity threshold, solar charging is performed on the battery pack and the electrical device simultaneously;

[0049] The third capacity threshold is smaller than the fourth capacity threshold.

[0050] When solar charging needs to charge the battery pack and the electrical device at the same time, it is necessary to comprehensively consider the current remaining capacity of the battery pack and the power demand of the electrical device. If the remaining capacity of the battery pack is less than the third capacity threshold, it means that the battery life will be affected. At this time, the battery pack should be charged first. When the remaining capacity of the battery pack is greater than the fourth capacity threshold, it means that the remaining capacity of the battery pack does not affect the battery life. At this time, the electrical device can be charged first. When the remaining capacity of the battery pack is greater than or equal to the third capacity threshold, and less than or equal to the fourth capacity threshold, it means that although the remaining capacity of the battery pack does not affect the battery life much, it is not particularly sufficient. At this time, the battery pack and the electrical device can be charged with solar energy at the same time to improve the efficiency of solar charging. Usually, the third capacity threshold is 20% of the total capacity of the battery pack, and the fourth capacity threshold is 40% of the total capacity of the battery pack.

[0051] It should be noted that when the battery pack has sufficient power and the solar energy's photoelectric conversion efficiency is sufficient, solar charging can also charge the car's 12V auxiliary battery, such as a lead-acid battery or a display battery.

[0052] It should be noted that photovoltaic charging may be terminated when the charging reaches a battery pack capacity threshold, for example, 90% to 95% of the total capacity, thereby terminating photovoltaic charging and providing energy storage space for energy feedback.

[0053] In a second aspect, the present application provides a solar charging device for new energy vehicles, comprising:

[0054] an acquiring unit, configured to acquire the remaining capacity of the battery pack; and

[0055] The control unit is used to determine whether to perform solar charging on the power battery pack and / or the power-consuming device based on the relationship between the remaining capacity of the battery pack and the capacity threshold. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0057] Figure 1 This is a flow chart of a solar charging method for a new energy vehicle according to an embodiment of the present application.

[0058] Figure 2 This is a flow chart of a solar charging method for a new energy vehicle according to an embodiment of the present application.

[0059] Figure 3 This is a flow chart of a solar charging method for a new energy vehicle according to an embodiment of the present application.

[0060] Figure 4 This is a flow chart of a solar charging method for a new energy vehicle according to an embodiment of the present application.

[0061] Figure 5 This is a flow chart of a solar charging method for a new energy vehicle according to an embodiment of the present application.

[0062] Figure 6 This is a flow chart of a solar charging method for a new energy vehicle according to an embodiment of the present application.

[0063] Figure 7 This is a flow chart of a solar charging method for a new energy vehicle according to an embodiment of the present application.

[0064] Figure 8 This is a flow chart of a solar charging method for a new energy vehicle according to an embodiment of the present application.

[0065] Figure 9 This is a flow chart of a solar charging method for a new energy vehicle according to an embodiment of the present application.

[0066] Figure 10 This is a schematic diagram of a solar charging device for a new energy vehicle according to an embodiment of the present application. DETAILED DESCRIPTION

[0067] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of this application without making any creative efforts shall fall within the scope of protection of this application.

[0068] Ground-based DC charging stations, AC charging stations, and wireless charging devices can charge the entire vehicle by connecting it to the vehicle. However, these three charging methods rely on ground-based charging equipment or ground-based power supply equipment, making them unsuitable for outdoor charging scenarios where ground-based charging equipment or ground-based power supply equipment is lacking. In scenarios where outdoor charging equipment is unavailable, or when demand for charging equipment surges during holidays, vehicles cannot be charged in a timely manner, impacting the charging experience.

[0069] In view of this, the present application provides a solar charging method and device for new energy vehicles to solve the problem of being unable to charge the vehicle in a timely manner.

[0070] First, as Figure 1 As shown, the present application provides a solar charging method for new energy vehicles, comprising the following steps:

[0071] S100: If the photoelectric conversion efficiency of the solar photovoltaic panel is greater than or equal to the photoelectric conversion efficiency threshold, obtain the remaining capacity of the battery pack;

[0072] S200: Determine, based on a relationship between a remaining capacity of the battery pack and a capacity threshold, whether to perform solar charging on the power battery pack and / or the electrical device.

[0073] This application determines the solar charging of the power battery pack and / or power-consuming device through the relationship between the photoelectric conversion efficiency of the solar photovoltaic panel, the remaining capacity of the battery pack and the capacity threshold. It can perform solar charging for new energy vehicles when there is insufficient ground charging equipment, the photoelectric conversion efficiency is sufficient, and the battery power is insufficient, so as to charge the vehicle in time and reduce the charging pressure of new energy vehicles.

[0074] Typically, solar charging can be performed when the remaining capacity of the battery pack is below a capacity threshold. The remaining capacity of the battery pack can typically be set to a capacity threshold of 20% to 90%. Solar charging of the battery pack or electrical device begins when the remaining capacity of the battery pack is below 20% of the capacity threshold. This is because solar charging has several drawbacks when the remaining capacity of the battery pack is below 20% of the capacity threshold, or even lower, such as 10%. For example, charging requires a large amount of energy and takes a long time, which affects the vehicle's range. If the solar charging progress is slower than the vehicle's power consumption rate, the vehicle may quickly run out of power, affecting the driving experience. However, starting solar charging when the remaining capacity of the battery pack is above 90% of the capacity threshold means that there is insufficient space for energy to be fed back during braking or downhill driving. Therefore, a battery pack remaining capacity of 20% to 90% of the capacity threshold is generally more appropriate. More preferably, a battery pack remaining capacity of 50% to 70% of the capacity threshold can reduce the impact on vehicle range while providing sufficient space for energy feedback.

[0075] It should be noted that before photovoltaic charging, it is necessary to first determine whether the photovoltaic system can work normally and without faults, and then determine whether the working status of the entire vehicle is normal and without faults. Only when both the photovoltaic system and the entire vehicle are fault-free can photovoltaic charging be carried out according to the corresponding conditions.

[0076] Combined with the first aspect, such as Figure 2 As shown, in some embodiments provided in this application, obtaining the photoelectric conversion efficiency of the solar photovoltaic panel includes:

[0077] S101, obtaining light intensity and the angle between the incident direction of sunlight and the photovoltaic panel;

[0078] S102. Obtaining the photoelectric conversion efficiency of the solar photovoltaic panel according to the light intensity and the angle between the incident direction of the sunlight and the photovoltaic panel.

[0079] The photoelectric conversion efficiency of a solar photovoltaic panel is related to the light intensity and the angle between the incident direction of sunlight and the photovoltaic panel. The specific calculation formula for the photoelectric conversion efficiency is:

[0080] η=V*I*F / (P*S),

[0081] Among them, η is the photoelectric conversion efficiency, V is the open circuit voltage, which is the voltage when the output current of the solar photovoltaic panel is 0, I is the short-circuit current, which is the current that the solar photovoltaic panel can output through a short-circuit load, F is the fill factor, which is the ratio of the output power of the solar photovoltaic panel to the product of the short-circuit current and the open-circuit voltage, P is the energy density of the incident sunlight, that is, the light intensity, and S is the surface area of ​​the solar photovoltaic panel converted to the area perpendicular to the incident direction of the sunlight.

[0082] Usually the angle is in the range of 15° to 85°, and the light intensity is in the range of 600 to 1000W / m 2 Within this range, solar photovoltaic panels have relatively good photoelectric conversion efficiency.

[0083] Combined with the first aspect, such as Figure 3 As shown, in some embodiments provided in the present application, determining to perform solar charging on the power battery pack and / or the electrical device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes:

[0084] S201, obtaining the output current of the solar panel and the rated charging current of the battery pack;

[0085] S202: If the ratio of the current output by the solar panel to the rated charging current of the battery pack is greater than the ratio threshold;

[0086] S203: Determine whether to perform solar charging on the power battery pack and / or the electrical device based on the relationship between the remaining capacity of the battery pack and the capacity threshold.

[0087] Determining whether to charge a vehicle with solar power based on the ratio of the solar panel output current to the battery pack's rated charging current can improve solar charging efficiency. Charging a new energy vehicle can only be performed when the solar panel output current is sufficient and the battery charging time is within the appropriate range. This improves solar charging efficiency and reduces inefficient and long-lasting solar charging. The typical threshold for the ratio of the solar panel output current to the battery pack's rated charging current is 5% to 10%.

[0088] Combined with the first aspect, such as Figure 4 As shown, in some embodiments provided in the present application, determining to perform solar charging on the power battery pack and / or the electrical device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes:

[0089] S204, obtaining the bus voltage value and photovoltaic boost output voltage value of the battery pack;

[0090] S205: If the bus voltage value of the battery pack is less than the photovoltaic boost output voltage value, determine to perform solar charging on the power battery pack and / or the electrical device according to the relationship between the remaining capacity of the battery pack and the capacity threshold.

[0091] Usually, only devices with higher voltage values ​​can charge devices with lower voltage values. Therefore, by obtaining the bus voltage value of the battery pack and the photovoltaic boost output voltage value and comparing them, photovoltaic charging can only be achieved when the bus voltage value of the battery pack is less than the photovoltaic boost output voltage value, that is, the photovoltaic boost output voltage value is high and the bus voltage value of the battery pack is low.

[0092] It should be noted that the working principle of photovoltaic boost is to increase the output voltage of the photovoltaic system to the battery pack bus voltage through a boost DC / DC voltage converter.

[0093] Combined with the first aspect, such as Figure 5 As shown, in some embodiments provided in this application, obtaining the bus voltage value and photovoltaic boost output voltage value of the battery pack includes:

[0094] S2041. Obtain the output voltage of the solar photovoltaic panel and the photovoltaic boost input voltage threshold;

[0095] S2042: If the output voltage of the solar photovoltaic panel is greater than or equal to the photovoltaic boost input voltage threshold, obtain the bus voltage value and the photovoltaic boost output voltage value of the battery pack.

[0096] Photovoltaic boost has a certain operating voltage range. Only when the output voltage of the solar photovoltaic panel is greater than or equal to the photovoltaic boost input voltage threshold, that is, the minimum value of the range, can photovoltaic boost be used to charge the battery pack. Usually, the minimum photovoltaic boost input voltage is the lowest output voltage of the photovoltaic system.

[0097] Combined with the first aspect, such as Figure 6 As shown, in some embodiments provided in the present application, determining to perform solar charging on the power battery pack and / or the electrical device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes:

[0098] S206, obtaining the discharge status of the battery pack;

[0099] S207: If the battery pack is in a non-discharging state, determine whether to perform solar charging on the power battery pack and / or the electrical device based on the relationship between the remaining capacity of the battery pack and the capacity threshold.

[0100] The battery pack has a charging state and a discharging state, so it is necessary to obtain the discharge state of the battery pack. The battery pack can only be charged in the non-discharging state. It should be noted that solar charging can be charged in parking mode or driving mode. When charging in parking mode, the battery pack usually discharges when the air conditioner is turned on. In this case, photovoltaic power can be used to power the air conditioner, and the excess power is used to power the battery pack, and the battery pack does not power the air conditioner alone. When charging in driving mode, the battery pack usually needs to provide energy for the vehicle power and the air conditioning system. In order to charge the battery pack, the vehicle power and air conditioning energy consumption can be provided by solar energy, and the battery pack is only charged.

[0101] Combined with the first aspect, such as Figure 7 As shown, in some embodiments provided in the present application, determining to perform solar charging on the power battery pack and / or the electrical device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes:

[0102] S208, obtaining the charging status of the battery pack;

[0103] S209: If the battery pack is in a non-charging state, determine whether to perform solar charging on the power battery pack and / or the electrical device based on the relationship between the remaining capacity of the battery pack and the capacity threshold.

[0104] Since there are many ways to charge the battery pack, such as charging pile charging, wireless charging, energy feedback charging and photovoltaic charging, but only one charging method can be used at a time, it is necessary to determine whether the battery pack has other forms of charging before solar charging. If not, solar charging can be used.

[0105] Combined with the first aspect, such as Figure 8 As shown, in some embodiments provided in the present application, determining to perform solar charging on the power battery pack and / or the electrical device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes:

[0106] S210: If the remaining capacity of the battery pack is less than a first capacity threshold, solar charging the battery pack;

[0107] S211. Obtain the remaining capacity of the battery pack;

[0108] S212: If the remaining capacity of the battery pack is greater than a second capacity threshold, stop solar charging of the battery pack;

[0109] The second capacity threshold is greater than the first capacity threshold.

[0110] When the remaining capacity of the battery pack is less than the first capacity threshold, it indicates that the current remaining capacity of the battery pack may affect the driving range and the battery pack needs to be charged with solar energy. When the remaining capacity of the battery pack after charging is greater than the second capacity threshold, it indicates that the remaining capacity of the battery pack does not affect the driving range. At this time, storage space is reserved for energy feedback and solar charging of the battery pack is stopped. Typically, the first capacity threshold is 30% to 50% of the total battery pack capacity, and the second capacity threshold is 60% to 90% of the total battery pack capacity.

[0111] Combined with the first aspect, such as Figure 9 As shown, in some embodiments provided in the present application, determining to perform solar charging on the power battery pack and / or the electrical device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes:

[0112] S213: If the remaining capacity of the battery pack is less than the third capacity threshold, the battery pack is preferentially charged by solar energy;

[0113] S214: If the remaining capacity of the battery pack is greater than a fourth capacity threshold, solar charging is preferentially performed on the power-consuming device;

[0114] S215: If the remaining capacity of the battery pack is greater than or equal to the third capacity threshold and less than or equal to the fourth capacity threshold, solar charging is performed on the battery pack and the electrical device simultaneously;

[0115] The third capacity threshold is smaller than the fourth capacity threshold.

[0116] When solar charging needs to charge the battery pack and the electrical device at the same time, it is necessary to comprehensively consider the current remaining capacity of the battery pack and the power demand of the electrical device. If the remaining capacity of the battery pack is less than the third capacity threshold, it means that the battery life will be affected. At this time, the battery pack should be charged first. When the remaining capacity of the battery pack is greater than the fourth capacity threshold, it means that the remaining capacity of the battery pack does not affect the battery life. At this time, the electrical device can be charged first. When the remaining capacity of the battery pack is greater than or equal to the third capacity threshold, and less than or equal to the fourth capacity threshold, it means that although the remaining capacity of the battery pack does not affect the battery life much, it is not particularly sufficient. At this time, the battery pack and the electrical device can be charged with solar energy at the same time to improve the efficiency of solar charging. Usually, the third capacity threshold is 20% of the total capacity of the battery pack, and the fourth capacity threshold is 40% of the total capacity of the battery pack.

[0117] It should be noted that when the battery pack has sufficient power and the solar energy's photoelectric conversion efficiency is sufficient, solar charging can also charge the car's 12V auxiliary battery, such as a lead-acid battery or a display battery.

[0118] It should be noted that photovoltaic charging may be terminated when the charging reaches a battery pack capacity threshold, for example, 90% to 95% of the total capacity, thereby terminating photovoltaic charging and providing energy storage space for energy feedback.

[0119] Second, as Figure 10 As shown, the present application provides a new energy vehicle solar charging device, comprising:

[0120] an acquiring unit, configured to acquire the remaining capacity of the battery pack; and

[0121] The control unit is used to determine whether to perform solar charging on the power battery pack and / or the power-consuming device based on the relationship between the remaining capacity of the battery pack and the capacity threshold.

[0122] By using the relationship between the photoelectric conversion efficiency of the solar photovoltaic panel, the remaining capacity of the battery pack and the capacity threshold, it is determined that the power battery pack and / or electrical device should be solar-powered for charging. When there is insufficient ground charging equipment, the photoelectric conversion efficiency is sufficient, and the battery power is insufficient, the new energy vehicle can be solar-powered for charging, thus charging the vehicle in a timely manner and reducing the charging pressure on the new energy vehicle.

[0123] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units inherent to these processes, methods, products or equipment. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0124] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0125] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0126] In some processes described in the embodiments of the present application, multiple operations or steps are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined.

[0127] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device to execute the methods described in each embodiment of the present application.

[0128] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A solar charging method for new energy vehicles, characterized in that: The following steps are involved: Obtain the photoelectric conversion efficiency of solar photovoltaic panels; If the photoelectric conversion efficiency of the solar photovoltaic panel is greater than or equal to the photoelectric conversion efficiency threshold, the remaining capacity of the battery pack is obtained; Determining to perform solar charging on the power battery pack and / or the power-consuming device based on a relationship between the remaining capacity of the battery pack and a capacity threshold; Among them, the determination of solar charging of the power battery pack and / or the electrical device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes: if the remaining capacity of the battery pack is less than the third capacity threshold, solar charging is given priority to the battery pack; if the remaining capacity of the battery pack is greater than the fourth capacity threshold, solar charging is given priority to the electrical device; if the remaining capacity of the battery pack is greater than or equal to the third capacity threshold and less than or equal to the fourth capacity threshold, solar charging is given to the battery pack and the electrical device at the same time, and the third capacity threshold is less than the fourth capacity threshold.

2. The solar charging method for new energy vehicles according to claim 1, characterized in that: The obtaining of the photoelectric conversion efficiency of the solar photovoltaic panel comprises: Obtain light intensity and the angle between the incident direction of sunlight and the photovoltaic panel; The photoelectric conversion efficiency of the solar photovoltaic panel is obtained based on the light intensity and the angle between the incident direction of sunlight and the photovoltaic panel.

3. The solar charging method for new energy vehicles according to claim 1, characterized in that: Determining to perform solar charging on the power battery pack and / or the power-consuming device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes: Get the current output by the solar panel and the rated charging current of the battery pack; If the ratio of the current output by the solar panel to the rated charging current of the battery pack is greater than the ratio threshold; Based on the relationship between the remaining capacity of the battery pack and the capacity threshold, it is determined that the power battery pack and / or the power-consuming device are to be charged with solar energy.

4. The solar charging method for new energy vehicles according to claim 1, characterized in that: Determining to perform solar charging on the power battery pack and / or the power-consuming device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes: Obtain the bus voltage value of the battery pack and the photovoltaic boost output voltage value; If the bus voltage value of the battery pack is less than the photovoltaic boost output voltage value, it is determined that the power battery pack and / or the electrical device will be charged with solar energy according to the relationship between the remaining capacity of the battery pack and the capacity threshold.

5. The solar charging method for new energy vehicles according to claim 4, characterized in that: The obtaining of the bus voltage value of the battery pack and the photovoltaic boost output voltage value includes: Get the output voltage of the solar photovoltaic panel and the photovoltaic boost input voltage threshold; If the output voltage of the solar photovoltaic panel is greater than or equal to the photovoltaic boost input voltage threshold, the bus voltage value of the battery pack and the photovoltaic boost output voltage value are obtained.

6. The solar charging method for new energy vehicles according to claim 1, characterized in that: Determining to perform solar charging on the power battery pack and / or the power-consuming device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes: Get the discharge status of the battery pack; If the battery pack is in a non-discharging state, it is determined that the power battery pack and / or the electrical device is to be solar-charged based on the relationship between the remaining capacity of the battery pack and the capacity threshold.

7. The solar charging method for new energy vehicles according to claim 1, characterized in that: Determining to perform solar charging on the power battery pack and / or the power-consuming device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes: Get the charging status of the battery pack; If the battery pack is in a non-charging state, it is determined that the power battery pack and / or the power device are to be solar-charged based on the relationship between the remaining capacity of the battery pack and the capacity threshold.

8. The solar charging method for new energy vehicles according to claim 1, characterized in that: Determining to perform solar charging on the power battery pack and / or the power-consuming device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes: If the remaining capacity of the battery pack is less than the first capacity threshold, the battery pack is charged by solar energy; Get the remaining capacity of the battery pack; If the remaining capacity of the battery pack is greater than a second capacity threshold, stopping solar charging of the battery pack; The second capacity threshold is greater than the first capacity threshold.

9. A solar charging device for new energy vehicles, characterized in that: include: A first acquisition unit acquires the photoelectric conversion efficiency of the solar photovoltaic panel; a second acquiring unit, configured to acquire the remaining capacity of the battery pack if the photoelectric conversion efficiency of the solar photovoltaic panel is greater than or equal to a photoelectric conversion efficiency threshold; as well as a control unit, configured to determine whether to perform solar charging on the power battery pack and / or the power-consuming device based on a relationship between the remaining capacity of the battery pack and a capacity threshold; Among them, the determination of solar charging of the power battery pack and / or the electrical device based on the relationship between the remaining capacity of the battery pack and the capacity threshold includes: if the remaining capacity of the battery pack is less than the third capacity threshold, solar charging is given priority to the battery pack; if the remaining capacity of the battery pack is greater than the fourth capacity threshold, solar charging is given priority to the electrical device; if the remaining capacity of the battery pack is greater than or equal to the third capacity threshold and less than or equal to the fourth capacity threshold, solar charging is given to the battery pack and the electrical device at the same time, and the third capacity threshold is less than the fourth capacity threshold.

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