Solar charging method and device for new energy vehicle

Abstract

The invention discloses a solar charging method and device for a new energy vehicle, and relates to the technical field of automobiles, and the solar charging method for the new energy vehicle comprises 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 the photoelectric conversion efficiency threshold value, obtaining the residual capacity of the battery pack; according to the relation between the residual capacity of the battery pack and the capacity threshold value, it is determined that solar charging is carried out on the power battery pack and / or the electric device, and according to the relation between the photoelectric conversion efficiency of the solar photovoltaic panel and the residual capacity of the battery pack and the capacity threshold value, it is determined that solar charging is carried out on the power battery pack and / or the electric device. The new energy vehicle can be charged by solar energy when ground charging equipment is insufficient, the photoelectric conversion efficiency is sufficient and the battery electric quantity is insufficient, the vehicle is charged in time, and the charging pressure of the new energy vehicle is reduced.

Description

Technical Field

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

[0002] Ground DC charging piles, AC charging piles, and wireless charging equipment can charge the entire vehicle by docking with the vehicle. However, these three charging methods rely on ground charging equipment or ground power supply equipment, and are not suitable for outdoor charging scenarios where there is a lack of ground charging equipment or ground power supply equipment. In the absence of outdoor charging equipment, or in the case of a surge in demand for charging equipment during holidays, the vehicle cannot be charged in time, affecting the charging experience of the electric vehicle. Summary of the invention

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

[0004] In a first aspect, the present application provides a solar charging method for 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] According to 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 electrical device is charged with solar energy.

[0007] This application determines the solar charging of the power battery pack and / or the 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] Generally, when the remaining capacity of the battery pack is below the capacity threshold, solar charging can be performed. The remaining capacity of the battery pack can generally be set to a capacity threshold of 20% to 90%. When the remaining capacity of the battery pack is below 20% of the capacity threshold, solar charging of the battery pack or the electrical device is started because when the remaining capacity of the battery pack is below 20% of the capacity threshold, for example, 10%, there are many disadvantages in solar charging, such as large charging amount, long time consumption, affecting the vehicle's endurance, and when the progress of solar charging is slower than the vehicle's power consumption rate, it may cause the vehicle's power to be quickly exhausted, affecting the driving experience. When the remaining capacity of the battery pack is above 90% of the capacity threshold, starting photovoltaic charging will cause insufficient space to store the energy fed back when the vehicle brakes or goes downhill. Therefore, it is generally more appropriate for the remaining capacity of the battery pack to be between 20% and 90% of the capacity threshold. More preferably, when the remaining capacity of the battery pack is between 50% and 70% of the capacity threshold, it can reduce the impact on the vehicle's endurance and provide sufficient space for energy feedback.

[0009] It should be noted that before photovoltaic charging, we must 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 the 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 solar photovoltaic panels 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 refers to 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 irradiated 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 1000 W / 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 comprises:

[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] According to 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 electrical device is charged with solar energy.

[0021] According to the ratio of the current output by the solar panel to the rated charging current of the battery pack, whether to charge the vehicle with solar energy can improve the efficiency of solar energy charging. Only when the current output by the solar panel is sufficient and the charging time for charging the battery is within the appropriate range, can the new energy vehicle be charged, which can improve the efficiency of solar energy charging and reduce inefficient and long-term solar energy charging. Usually, the threshold value of the ratio of the current output by the solar panel to the rated charging current of the battery pack 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 comprises:

[0023] Get 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 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.

[0025] Usually only devices with high voltage values ​​can charge devices with low voltage values. Therefore, by obtaining the bus voltage value of the battery pack and the photovoltaic boost output voltage value and comparing their sizes, photovoltaic charging can be achieved only 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 and the photovoltaic boost output voltage value of the battery pack are obtained.

[0030] Photovoltaic boost has a certain working 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 comprises:

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

[0033] If the battery pack is in a non-discharging state, it is determined 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.

[0034] The battery pack has a charging state and a discharging state, so it is necessary to obtain the discharging state of the battery pack, and 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 in driving mode. When charging in parking mode, the battery pack usually discharges when the air conditioner is turned on. In this case, photovoltaics 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 comprises:

[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 electrical device is 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 comprises:

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

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

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

[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 means that the current remaining capacity of the battery pack may affect the battery life, and the battery pack needs to be charged by solar energy. When the remaining capacity of the battery pack after charging is greater than the second capacity threshold, it means that the remaining capacity of the battery pack does not affect the battery life. At this time, storage space can be reserved for energy feedback, and solar charging of the battery pack is stopped. Usually, the first capacity threshold is 30% to 50% of the total capacity of the battery pack, and the second capacity threshold is 60% to 90% of the total capacity of the battery pack.

[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 comprises:

[0046] If the remaining capacity of the battery pack is less than the third capacity threshold, the battery pack is preferentially charged by solar energy;

[0047] If the remaining capacity of the battery pack is greater than the fourth capacity threshold, solar charging is preferentially performed on the power-consuming 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, the battery pack and the electrical device are charged with solar energy at the same time;

[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 remaining capacity of the current battery pack and the power demand of the electrical equipment. 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 by 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, such as 90% to 95% of the total capacity, and at the same time, energy storage space is provided for energy feedback.

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

[0054] an acquisition unit, used 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 electrical device according to 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 drawings required for use in the description of the embodiments will be briefly introduced below. 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 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] Fig. 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] Fig.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] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0068] Ground DC charging piles, AC charging piles, and wireless charging equipment can charge the entire vehicle by docking with the vehicle. However, these three charging methods rely on ground charging equipment or ground power supply equipment, and are not suitable for outdoor charging scenarios where there is a lack of ground charging equipment or ground power supply equipment. In the absence of outdoor charging equipment, or in the case of a surge in demand for charging equipment during holidays, the vehicle cannot be charged in time, affecting the charging experience of the electric vehicle.

[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 time.

[0070] First, as Figure 1 As shown, the present application provides a solar charging method for a new energy vehicle, 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, obtaining the remaining capacity of the battery pack;

[0072] S200: Determine whether 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.

[0073] This application determines the solar charging of the power battery pack and / or the 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] Generally, when the remaining capacity of the battery pack is below the capacity threshold, solar charging can be performed. The remaining capacity of the battery pack can generally be set to a capacity threshold of 20% to 90%. When the remaining capacity of the battery pack is below 20% of the capacity threshold, solar charging of the battery pack or the electrical device is started because when the remaining capacity of the battery pack is below 20% of the capacity threshold, for example, 10%, there are many disadvantages in solar charging, such as large charging amount, long time consumption, affecting the vehicle's endurance, and when the progress of solar charging is slower than the vehicle's power consumption rate, it may cause the vehicle's power to be quickly exhausted, affecting the driving experience. When the remaining capacity of the battery pack is above 90% of the capacity threshold, starting photovoltaic charging will cause insufficient space to store the energy fed back when the vehicle brakes or goes downhill. Therefore, it is generally more appropriate for the remaining capacity of the battery pack to be between 20% and 90% of the capacity threshold. More preferably, when the remaining capacity of the battery pack is between 50% and 70% of the capacity threshold, it can reduce the impact on the vehicle's endurance and provide sufficient space for energy feedback.

[0075] It should be noted that before photovoltaic charging, we must 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, 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 solar photovoltaic panels 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 refers to 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 irradiated 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 1000 W / m 2 Within this range, solar photovoltaic panels have relatively good photoelectric conversion efficiency.

[0083] Combined with the first aspect, 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 according to the relationship between the remaining capacity of the battery pack and the capacity threshold value includes:

[0084] S201, obtaining the current output by 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 according to the relationship between the remaining capacity of the battery pack and the capacity threshold.

[0087] According to the ratio of the current output by the solar panel to the rated charging current of the battery pack, whether to charge the vehicle with solar energy can improve the efficiency of solar energy charging. Only when the current output by the solar panel is sufficient and the charging time for charging the battery is within the appropriate range, can the new energy vehicle be charged, which can improve the efficiency of solar energy charging and reduce inefficient and long-term solar energy charging. Usually, the threshold value of the ratio of the current output by the solar panel to the rated charging current of the battery pack is 5% to 10%.

[0088] Combined with the first aspect, 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 according to the relationship between the remaining capacity of the battery pack and the capacity threshold value includes:

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

[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 high voltage values ​​can charge devices with low voltage values. Therefore, by obtaining the bus voltage value of the battery pack and the photovoltaic boost output voltage value and comparing their sizes, photovoltaic charging can be achieved only 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, Figure 5 As shown, in some embodiments provided in the present application, obtaining the bus voltage value and photovoltaic boost output voltage value of the battery pack includes:

[0094] S2041, obtaining 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 photovoltaic boost output voltage value of the battery pack.

[0096] Photovoltaic boost has a certain working 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, 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 according to the relationship between the remaining capacity of the battery pack and the capacity threshold value includes:

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

[0099] S207: If the battery pack is in a non-discharging state, determining 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 value.

[0100] The battery pack has a charging state and a discharging state, so it is necessary to obtain the discharging state of the battery pack, and 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 in driving mode. When charging in parking mode, the battery pack usually discharges when the air conditioner is turned on. In this case, photovoltaics 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, 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 according to the relationship between the remaining capacity of the battery pack and the capacity threshold value includes:

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

[0103] S209: If the battery pack is in a non-charging state, 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.

[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, 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 according to the relationship between the remaining capacity of the battery pack and the capacity threshold value includes:

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

[0107] S211, obtaining the remaining capacity of the battery pack;

[0108] S212, if the remaining capacity of the battery pack is greater than the 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 means that the current remaining capacity of the battery pack may affect the battery life, and the battery pack needs to be charged by solar energy. When the remaining capacity of the battery pack after charging is greater than the second capacity threshold, it means that the remaining capacity of the battery pack does not affect the battery life. At this time, storage space can be reserved for energy feedback, and solar charging of the battery pack is stopped. Usually, the first capacity threshold is 30% to 50% of the total capacity of the battery pack, and the second capacity threshold is 60% to 90% of the total capacity of the battery pack.

[0111] Combined with the first aspect, Fig. 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 according to the relationship between the remaining capacity of the battery pack and the capacity threshold value 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 the fourth capacity threshold, solar charging is performed preferentially 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 at the same time;

[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 remaining capacity of the current battery pack and the power demand of the electrical equipment. 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 by 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, such as 90% to 95% of the total capacity, and at the same time, energy storage space is provided for energy feedback.

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

[0120] an acquisition unit, used 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 electrical device according to the relationship between the remaining capacity of the battery pack and the capacity threshold.

[0122] 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 is determined that the power battery pack and / or the power-consuming device should be charged by solar energy. When the ground charging equipment is insufficient, the photoelectric conversion efficiency is sufficient, and the battery power is insufficient, the new energy vehicle can be charged by solar energy, and the vehicle can be charged in time to reduce the charging pressure of 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, device, product or equipment that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes 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 "first", "second" and "third" to be different types.

[0124] In the description of the embodiments of the present application, "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 the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[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; the “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 that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed 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 a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially 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, disk, CD) as described above, and includes a number of instructions for 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 are not intended to 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; According to 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 electrical device is charged with solar energy.

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 the 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: The step of determining, based on the relationship between the remaining capacity of the battery pack and the capacity threshold, to perform solar charging on the power battery pack and / or the power-consuming device comprises: 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; According to 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 electrical device is charged with solar energy.

4. The solar charging method for new energy vehicles according to claim 1, characterized in that: The step of determining, based on the relationship between the remaining capacity of the battery pack and the capacity threshold, to perform solar charging on the power battery pack and / or the power-consuming device comprises: Get 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 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.

5. The solar charging method for new energy vehicles as claimed in claim 4, characterized in that: The obtaining of the bus voltage value of the battery pack and the photovoltaic boost output voltage value comprises: 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 and the photovoltaic boost output voltage value of the battery pack are obtained.

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

7. The solar charging method for new energy vehicles according to claim 1, characterized in that: The step of determining, based on the relationship between the remaining capacity of the battery pack and the capacity threshold, to perform solar charging on the power battery pack and / or the power-consuming device comprises: 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 electrical device is 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 according to the relationship between the remaining capacity of the battery pack and the capacity threshold comprises: If the remaining capacity of the battery pack is less than the first capacity threshold, charging the battery pack with solar energy; Get the remaining capacity of the battery pack; If the remaining capacity of the battery pack is greater than the second capacity threshold, solar charging of the battery pack is stopped; The second capacity threshold is greater than the first capacity threshold.

9. The solar charging method for new energy vehicles according to claim 1, characterized in that: The step of determining, based on the relationship between the remaining capacity of the battery pack and the capacity threshold, to perform solar charging on the power battery pack and / or the power-consuming device comprises: If the remaining capacity of the battery pack is less than the third capacity threshold, the battery pack is preferentially charged by solar energy; If the remaining capacity of the battery pack is greater than the fourth capacity threshold, solar charging is preferentially performed on the power-consuming 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, the battery pack and the electrical device are charged with solar energy at the same time; The third capacity threshold is smaller than the fourth capacity threshold.

10. A solar charging device for new energy vehicles, characterized in that: include: An acquisition unit, used to acquire the remaining capacity of the battery pack; as well as The control unit is used to determine whether 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.

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