Photo-thermal insulation system for power battery of electric vehicle

Abstract

The invention discloses a photo-thermal insulation system for a power battery of an electric vehicle, and belongs to the field of battery insulation. A solar heat collection cavity is formed by integrating double-layer coated glass on a car roof and a sunshade curtain, and dynamic temperature control of a battery pack is achieved with air as a heating medium. The system heats the battery through closed air circulation in a low-temperature environment with sufficient sunlight, and is switched to open air cooling heat dissipation at a high temperature. According to the system, the problems that the endurance mileage and the charging and discharging power are reduced due to battery performance degradation of the automobile in winter are effectively relieved, a large amount of battery preheating energy consumption is saved, the energy consumption of the fan is low, and the obvious energy-saving and emission-reducing effects are achieved. The device is simple in structure, does not need to transform an existing vehicle body frame, and is suitable for pure electric and hybrid power vehicle types.

Description

Technical Field

[0001] The present invention relates to the technical field of battery insulation, and in particular to a photothermal insulation system for a power battery of an electric vehicle. Background Art

[0002] Currently, thermal management technologies for electric vehicle power batteries in low-temperature environments still face significant challenges. First, traditional electric heating solutions (such as PTC heaters) generally suffer from low energy efficiency and reliance on battery power, resulting in a significant reduction in winter range. While optimized control algorithms or integrated liquid cooling panels can partially improve heating efficiency, the core energy consumption issue remains unresolved, and system complexity and maintenance costs increase accordingly. Second, liquid cooling systems rely on pumps, heat exchange piping, and coolant circulation, resulting in complex structures and significant weight increases. Even attempts to integrate heating elements or incorporate energy recovery technologies remain constrained by the inherent limitations of liquid cooling architectures. Furthermore, existing solar thermal management technologies often utilize standalone collectors or liquid working fluid circulation, resulting in low integration with the vehicle body structure, significant heat losses, and insufficient conversion efficiency. Some solutions incorporate air circulation heating, but these still rely on electrical power and have limited thermal insulation performance. Overall, existing technologies struggle to achieve a balance between low energy consumption, high integration, and efficient solar energy utilization. An innovative thermal management solution is urgently needed to overcome the performance bottleneck of batteries in low-temperature environments. Summary of the Invention

[0003] The present invention provides a solar thermal insulation system for electric vehicle power batteries. The system utilizes solar thermal resources on the roof to dynamically control the temperature of the power batteries. Low-energy temperature control is achieved through solar heat collection and air circulation technology, effectively alleviating problems such as reduced cruising range and charging and discharging power caused by battery performance degradation in winter.

[0004] An embodiment of the present invention provides a solar thermal insulation system for electric vehicle power batteries, comprising:

[0005] The roof sunshade device is used to absorb solar radiation energy and heat the air to obtain hot air working medium;

[0006] A circulating fan is used to transport the hot air heated by the roof sunshade device to the battery pack, or to transport the cold air from the external environment to the battery pack, and to transport the hot air from the battery pack to the outside world;

[0007] a circulation pipeline, one end of which is connected to the roof sunshade device, and the other end of which is connected to the battery pack via the circulation fan;

[0008] The control module is used to generate a control signal according to the real-time temperature of the battery pack and the solar radiation intensity, and use the control signal to control the working mode of the roof sunshade device and the circulating fan to heat or dissipate heat for the battery pack.

[0009] Optionally, in one embodiment of the present invention, the roof sunshade device includes, from top to bottom, a roof light-transmitting layer, an air medium layer between the light-transmitting layers, a roof inner light-transmitting structure, a sealed air interlayer, a sunshade device heat-absorbing layer, and a sunshade device heat-insulating layer; the air is heated in the sealed air interlayer to obtain a hot air working medium.

[0010] Optionally, in one embodiment of the present invention, the circulating fan includes a forward start mode and a reverse start mode, and the forward start mode or the reverse start mode is selected to be turned on according to the control signal of the control module.

[0011] Optionally, in one embodiment of the present invention, the control module is specifically configured to:

[0012] When the real-time temperature of the battery pack is less than or equal to a first preset temperature and the solar radiation intensity is greater than a preset value, a heating control signal is generated to control the deployment of the roof sunshade device and to control the forward mode of the circulating fan to transport the hot air working medium generated by the roof sunshade device to the battery pack to heat the battery pack;

[0013] When the real-time temperature of the battery pack is less than or equal to the first preset temperature and the solar radiation intensity is less than or equal to the preset value, a heat preservation control signal is generated to control the roof sunshade device to be retracted and the circulation fan to be turned off;

[0014] When the real-time temperature of the battery pack is greater than or equal to a second preset temperature, a heat dissipation control signal is generated to control the roof sunshade device to be folded, and the circulating fan is controlled to operate in reverse mode to draw in cold air from the external environment and deliver it to the battery pack to cool the battery pack, wherein the second preset temperature is higher than the first preset temperature.

[0015] Optionally, in one embodiment of the present invention, the control module is further configured to adjust the rotation speed of the circulation fan according to temperature changes during the heating and cooling processes of the battery pack.

[0016] Optionally, in one embodiment of the present invention, the circulation pipeline is arranged in a hidden manner along the vehicle body.

[0017] Optionally, in one embodiment of the present invention, a temperature-equalizing air duct is provided inside the battery pack, and a guide structure is used to ensure that the hot air is evenly distributed between the battery cells.

[0018] Optionally, in one embodiment of the present invention, the circulation pipeline includes a heat medium circulation pipeline, a heat dissipation mode exhaust channel and a heat dissipation mode cold air intake channel. The heat medium circulation pipeline is connected between the roof sunshade device and the battery pack through the circulation fan, and is used to transport hot air working medium to heat the battery pack; the heat dissipation mode exhaust channel and the heat dissipation mode cold air intake channel are respectively connected to the two ends of the battery pack through the circulation fan, the heat dissipation mode cold air intake channel is used to input cold air, and the heat dissipation mode exhaust channel is used to discharge hot air to cool the battery pack.

[0019] Compared with traditional electric vehicle power battery thermal management solutions, the solar thermal insulation system for electric vehicle power batteries according to the embodiments of the present invention has the following significant advantages:

[0020] (1) Efficient solar energy utilization and energy saving and consumption reduction

[0021] This innovative system integrates the roof skylight structure and sunshade into a solar-to-air heat collector, significantly improving solar radiation capture efficiency through the synergistic effect of light and heat. Using air as the heat medium and requiring only a low-power fan to drive the circulation, it achieves a low-carbon operation model powered by solar energy, supplemented by electricity, significantly reducing battery preheating energy consumption.

[0022] (2) Multi-mode intelligent temperature control and thermal management optimization

[0023] Based on temperature and light sensing, the system intelligently switches operating modes: a) Daytime Heating Mode: Deploy the roof sunshade, and the circulating fan runs forward to deliver hot air, rapidly raising the battery temperature; b) Nighttime Insulation Mode: Retract the roof sunshade, and the circulating fan stops, cooperating with the thermal insulation structure to maintain a stable battery temperature; c) High-Temperature Cooling Mode: Retract the roof sunshade, and the circulating fan runs to introduce cool air for forced cooling. These three modes seamlessly transition to ensure the battery remains within a safe temperature range.

[0024] (3) Structural integration and cost-effectiveness

[0025] Leveraging the existing roof skylight structure, the roof sunshade combines heat absorption and insulation, eliminating the need for additional collector space. Concealed air supply and return ducting prevents impact on the vehicle's structure and aerodynamic performance. The system eliminates the need for internal battery pack modifications, significantly reducing manufacturing costs and maintenance complexity, while improving overall economic efficiency and reliability.

[0026] (4) Environmental friendliness and extended battery life

[0027] Solar energy replaces traditional electric heating, significantly reducing carbon emissions throughout its lifecycle. Precise temperature control effectively mitigates aging issues such as low-temperature lithium deposition and high-temperature electrolyte decomposition, extending battery life. Closed-loop air circulation combined with high-efficiency filtration prevents heat transfer leakage and contaminant intrusion, ensuring long-term stable system operation.

[0028] (5) Improved user experience and market adaptability

[0029] Supporting remote monitoring and intelligent preheating, users can initiate the preheating process in advance, eliminating concerns about low-temperature range. The skylight automatically switches between daylighting and heat collection modes, balancing passenger comfort with efficient energy use. This solution significantly improves winter range in cold regions, enhancing the competitiveness of electric vehicles in the market.

[0030] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0032] Figure 1 This is a schematic structural diagram of a solar thermal insulation system for electric vehicle power batteries provided according to an embodiment of the present invention.

[0033] Explanation of the accompanying symbols: 1—solar radiation light source; 2—roof light-transmitting layer; 3—air medium layer between light-transmitting layers; 4—roof inner light-transmitting structure; 5—sealed air interlayer (hot air generating cavity); 6—sunshading device heat-absorbing layer; 7—sunshading device insulation layer; 8—air duct insulation structure; 9—heat medium circulation pipeline; 10—adjustable speed fan; 11—power battery pack; 12—battery pack composite insulation layer; 13—heat dissipation mode exhaust channel; 14—heat dissipation mode cold air intake channel. DETAILED DESCRIPTION

[0034] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0035] The solar thermal insulation system for electric vehicle power batteries according to an embodiment of the present invention includes:

[0036] The roof sunshade device is used to absorb solar radiation energy and heat the air to obtain hot air working medium;

[0037] Circulation fan, used to transport the hot air heated by the roof sunshade device to the battery pack, or to transport the cold air from the outside environment to the battery pack, and to transport the hot air from the battery pack to the outside;

[0038] Circulation pipeline, one end of the circulation pipeline is connected to the roof sunshade device, and the other end is connected to the battery pack through the circulation fan;

[0039] The control module is used to generate a control signal based on the real-time temperature of the battery pack and the solar radiation intensity, and use the control signal to control the working mode of the roof sunshade device and the circulation fan to heat or dissipate heat for the battery pack.

[0040] Optionally, in one embodiment of the present invention, the roof sunshade device includes, from top to bottom, a roof light-transmitting layer, an air medium layer between the light-transmitting layers, a roof inner light-transmitting structure, a sealed air interlayer, a sunshade device heat-absorbing layer, and a sunshade device heat-insulating layer; the air is heated in the sealed air interlayer to obtain a hot air working medium.

[0041] Specifically, the light-absorbing layer is made of a high-absorbency material, while the heat-insulating layer is made of a low-thermal-conductivity material. In heating mode, the roof sunshade deploys, allowing the light-transmitting structure to receive solar radiation, heating the enclosed air layer to form a hot air working medium. This hot air is then driven by a circulating fan and transported through a circulation pipeline to the battery pack, where it undergoes forced convection heat exchange with the cell surface.

[0042] In one embodiment of the present invention, thermal insulation materials may be provided around the circulation pipeline and the heated enclosed air interlayer, and may be covered with low thermal conductivity materials and arranged in a hidden manner along the vehicle body.

[0043] Optionally, in one embodiment of the present invention, the circulating fan includes a forward start mode and a reverse start mode, and the forward start mode or the reverse start mode is selected to be turned on according to a control signal of the control module.

[0044] Optionally, in one embodiment of the present invention, the control module is specifically configured to:

[0045] When the real-time temperature of the battery pack is less than or equal to a first preset temperature and the solar radiation intensity is greater than a preset value, a heating control signal is generated to control the deployment of the roof sunshade device and to control the start of the forward mode of the circulating fan to transport the hot air working medium generated by the roof sunshade device to the battery pack to heat the battery pack;

[0046] When the real-time temperature of the battery pack is less than or equal to the first preset temperature and the solar radiation intensity is less than or equal to the preset value, a heat preservation control signal is generated to control the roof sunshade device to be retracted and the circulation fan to be turned off;

[0047] When the real-time temperature of the battery pack is greater than or equal to the second preset temperature, a heat dissipation control signal is generated to control the roof sunshade device to be folded, and the circulating fan is controlled to operate in reverse mode to draw in cold air from the external environment and deliver it to the battery pack to cool the battery pack. The second preset temperature is higher than the first preset temperature.

[0048] It's understood that both the battery pack and the roof sunshade are equipped with sensors, such as temperature and light sensors, to monitor the battery pack temperature and solar radiation intensity in real time. For example, when the temperature is ≤0°C, heating mode is activated, deploying the roof sunshade and running the fan in the forward direction. When the temperature is ≥45°C, cooling mode is activated, retracting the roof sunshade and running the fan in the reverse direction to introduce cool air for heat dissipation. Furthermore, the fan speed and sunshade status can be dynamically adjusted based on temperature thresholds to maintain the battery temperature within a safe range.

[0049] Optionally, in one embodiment of the present invention, the control module is further configured to adjust the rotation speed of the circulation fan according to temperature changes during the heating and cooling processes of the battery pack.

[0050] For example, when the battery temperature is ≤0℃ and the hot air temperature is ≥10℃, the fan runs at the highest speed; when the battery temperature is between 0-10℃, the fan speed is adjusted linearly with the temperature difference; when the battery temperature is ≥45℃, the fan runs in reverse and introduces external cold air through duct switching, and the fan speed is adjusted according to the cooling rate.

[0051] Optionally, in one embodiment of the present invention, the circulation pipeline includes a heat medium circulation pipeline, a heat dissipation mode exhaust channel and a heat dissipation mode cold air intake channel. The heat medium circulation pipeline is connected between the roof sunshade device and the battery pack through a circulation fan, and is used to transport hot air working medium to heat the battery pack; the heat dissipation mode exhaust channel and the heat dissipation mode cold air intake channel are respectively connected to the two ends of the battery pack through a circulation fan, the heat dissipation mode cold air intake channel is used to input cold air, and the heat dissipation mode exhaust channel is used to discharge hot air to cool the battery pack.

[0052] In a specific embodiment, the working process of the electric vehicle power battery solar thermal insulation system is as follows:

[0053] 1) Solar energy capture and hot air generation

[0054] Deploy the roof sunshade, allowing the light-absorbing layer to fully absorb solar radiation passing through the double-layer coated glass, heating the enclosed air layer to form a hot air working medium. Preferably, the double-layer glass is designed with an anti-reflective coating to improve light transmission efficiency. When deployed, the sunshade forms a closed heat-collecting cavity with the glass to maximize heat energy conversion efficiency.

[0055] (2) Heat medium circulation and temperature transfer

[0056] The hot air is driven by an adjustable-speed fan through the insulation pipe and transported to the battery pack, where it is forced to exchange heat with the surface of the battery cell through convection. Preferably, the circulation pipe is hidden along the vehicle body and coated with low thermal conductivity material to reduce heat loss; a uniform temperature air duct is set inside the battery pack, and the guide structure ensures that the hot air is evenly distributed to the gaps between the battery cells. The outside of the battery pack is wrapped with a composite insulation layer, including an inner layer of low thermal conductivity foam and an outer layer of highly reflective film. The fan supports forward and reverse operation: when running in the forward direction, a closed cycle is formed to heat the battery, and when running in the reverse direction, it switches to an open air duct to introduce external cold air for heat dissipation.

[0057] (3) Multi-mode intelligent control

[0058] Real-time monitoring of battery temperature and light intensity allows for dynamic switching of operating modes: a) Heating mode activation: When the battery temperature is ≤0°C and the light intensity is ≥ a set threshold, the sunshade deploys and the fan runs in the forward direction, delivering heated air at maximum speed. b) Insulation adjustment logic: When the battery temperature is between 0-45°C, the fan speed is dynamically adjusted based on the real-time temperature difference, preferably adjusting the flow rate linearly. c) Cooling mode activation: When the battery temperature is ≥45°C, the sunshade deploys and the fan switches to reverse direction, introducing external cold air through the air duct switching device for forced cooling. Furthermore, the system incorporates a path control component to prevent hot air from flowing back into the roof sunshade during cooling mode.

[0059] Preferably, the light-transmitting glass is integrated with the roof, and a flow equalizing device is provided in the air interlayer to ensure uniform distribution of hot air. The control module adopts an adaptive PID algorithm to comprehensively consider the battery temperature change rate, ambient temperature and light intensity to achieve precise matching of the fan speed and shading status.

[0060] like Figure 1 As shown, the insulation method of the electric vehicle power battery light thermal insulation system, whose specific working mode is dynamically switched according to the battery temperature and ambient light conditions, includes the following steps:

[0061] (1) Daytime heating mode

[0062] When the battery (assembly 11) temperature is detected to be below or equal to a set low-temperature threshold (e.g., 0°C) and the solar radiation intensity (assembly 1) exceeds a set light threshold, the system automatically activates daytime heating mode. At this point, the roof sunshade (assemblies 6 and 7) deploys, allowing its light-absorbing layer to fully absorb the solar radiation energy transmitted through the roof's light-transmitting structure (assemblies 2, 3, and 4). The enclosed air layer (assembly 5, the hot air generation chamber) formed between the sunshade and the light-transmitting structure is heated, generating a hot air working medium. The circulating fan (assembly 10) is activated in forward mode, driving hot air through the insulation duct (assembly 9, with dual supply and return air channels) and into the battery pack. Within the battery pack, the hot air passes through uniformly distributed air ducts, exchanging heat with the battery cell surfaces through forced convection, raising the battery temperature. The control system monitors the battery temperature in real time and dynamically adjusts the fan speed based on the temperature rise. The fan speed is reduced when the temperature reaches the intermediate threshold; if the temperature reaches the upper limit of the safe range, the fan is stopped, and the temperature is maintained by natural circulation of the air in the layer. This mode uses solar energy to heat the air, avoiding the consumption of battery power and reducing heat loss through a closed-loop cycle.

[0063] (2) Nighttime heat preservation mode

[0064] When the ambient temperature is lower than the set low temperature threshold and the solar radiation intensity is insufficient, the system switches to nighttime heat preservation mode. At this time, the roof sunshade device (components 6 and 7) is retracted to the reserved position. The circulating fan (component 10) stops running. The composite insulation layer (component 12) wrapped around the outside of the battery pack effectively isolates the infiltration of external cold air and slows down the temperature drop of the battery. A temperature equalizing structure (such as a heat conducting plate) can be set inside or at the bottom of the battery pack to reduce the temperature difference between the battery cells and maintain a relatively stable temperature of the battery pack.

[0065] (3) High temperature heat dissipation mode

[0066] When it is detected that the battery (component 11) temperature reaches or exceeds the set high temperature threshold (for example, 45°C), the system immediately switches to high-temperature heat dissipation mode. At this time, the roof sunshade device (components 6 and 7) is retracted to avoid additional heat absorption. The circulation fan (component 10) switches to reverse operation mode. The fan draws in ambient cold air from the outside of the vehicle body (component 14). The cold air is directly introduced into the battery pack (component 11) through the insulation pipe (component 9). The cold air flows through the guide structure inside the battery pack, forming turbulence, enhancing the forced convection heat dissipation efficiency with the battery cell surface, and at the same time, the hot air is discharged from the vehicle body exhaust port (component 13). During the heat dissipation process, an air filter can be set at the air inlet to intercept pollutants. The control system dynamically reduces the fan speed according to the drop in battery temperature. When the temperature drops to a safe range, the fan can stop running and switch to natural ventilation. This mode can quickly and effectively reduce the battery temperature, and the fan power consumption is low.

[0067] The present invention uses a dual-function design integrating a skylight structure and a sunshade, uses the roof as a solar heat collection surface, and uses air as a working medium to achieve dynamic temperature control. The sunshade has both heat absorption and heat insulation functions, and is combined with a fan to regulate air circulation. Low-energy heating can be achieved without modifying the body frame, while reducing heat loss. The power of traditional PTC heaters generally reaches 2-3kW, while the present invention uses a photothermal integrated design and only requires a fan drive (power consumption ≤ 10W), with energy consumption less than 0.5% of the traditional solution. As shown in a specific case, under Harbin winter conditions, the system's average daily heat collection reaches 6.187MJ, which can completely replace electric heating. Through the three core designs of structural integration (skylight + sunshade), energy diversification (solar energy + air circulation) and intelligent control (temperature feedback regulation), it is significantly superior to existing technologies in reducing energy consumption (fan power consumption ≤ 10W), simplifying the system (no liquid cooling pipeline) and improving energy efficiency.

[0068] To address the technical bottlenecks of existing electric vehicle power batteries in low-temperature environments, such as excessive heating energy consumption, complex liquid cooling system structures, and inefficient solar thermal management, this paper proposes a power battery temperature control system based on rooftop solar thermal resources. This system innovatively integrates double-layered rooftop glass with deployable sunshades into a solar thermal collector. This, combined with air circulation piping and intelligent control strategies, achieves efficient solar energy capture and dynamic distribution of thermal energy. The system aims to break through the limitations of traditional technologies: first, solar radiation energy is converted into hot air working fluid through the rooftop thermal collector, replacing high-energy-consuming PTC electric heating and significantly reducing dependence on battery power; second, based on real-time feedback from multi-zone temperature sensors, a fuzzy PID control algorithm is used to drive the centrifugal fan, automatically switching between heating and cooling modes, and accurately maintaining the battery operating temperature in a safe range of 0-45°C; at the same time, the thermal management architecture is simplified through an integrated design, and air circulation replaces complex liquid cooling systems, reducing hardware costs by more than 30%; in addition, the introduction of a composite insulation layer reinforced design can extend the low-temperature insulation time to 8 hours under no light conditions, and the battery temperature fluctuation under extreme working conditions does not exceed ±2°C, effectively improving the system's all-weather reliability.

[0069] The feasibility of the system's thermal balance is verified below using actual data from Harbin (components 1-14 working together):

[0070] Solar thermal collection analysis: Taking Harbin in December as an example (data source: solar radiation intensity in winter and summer in major cities across the country), the average daily total solar radiation on the horizontal surface is 5.162MJ / m 2 . The panoramic sunroof glass area is 1.3m 2, the average daily received energy is 6.711 MJ. Sunlight sequentially passes through Module 2 (upper layer, 8mm double-sided anti-reflection coated ultra-clear tempered glass with 98% transmittance), Module 3 (air dielectric layer), and Module 4 (lower layer, 3mm double-sided anti-reflection coated tempered glass with 96% transmittance). Finally, it is converted into heat energy by Module 6 (light-absorbing layer with 0.98 absorptivity). Calculations show that the radiant energy after passing through Module 2 is 6.576 MJ; the radiant energy after passing through Module 4 is 6.310 MJ; and the actual heat collected by Module 6 is 6.187 MJ.

[0071] Fan energy consumption and heat generation analysis: Driven by component 10 (fan), air flows through component 9. Pipeline parameters: length 4m, pipe diameter 40mm, flow rate 2m / s, air density 1.293kg / m 3 , the resistance coefficient along the way is 0.029. According to the fluid mechanics formula:

[0072]

[0073] Where, P f is the resistance loss along the way, Pa; l is the pipe length, m; d is the pipe diameter, m; v is the average flow velocity of the section, m / s; λ is the resistance coefficient along the way; is the air density, kg / m 3 The resistance loss along the way is 7.5Pa. The total pressure loss is conservatively estimated to be 80Pa. The flow rate is 0.006m 3 / s, fan efficiency 10% power 4.8W (actually designed as 10W). If the fan works for 8 hours during the day, the heat generated is 288.00kJ.

[0074] Quantifying system heat loss: The average outdoor temperature is -15.6°C, and the battery temperature must be maintained above 0°C (component 11). Assumptions: Air temperature entering and exiting the battery pack: 15°C → 5°C (average temperature 10°C); component heat dissipation temperature difference: 25°C for the skylight / compartment / mezzanine / air duct, and 20°C for the battery. Parameters of key heat dissipation components are shown in Table 1.

[0075] Table 1 Parameters of key heat dissipation components

[0076]

[0077] Thermal balance verification results: Tables 2 and 3 summarize the system's heat balance throughout the day. Detailed results are as follows.

[0078] Table 2 Details of heat loss

[0079]

[0080] Table 3 System total heat balance

[0081]

[0082] Conclusion: The total heat absorption (6187.00 kJ + 288.00 kJ = 6475.00 kJ) is significantly higher than the total heat dissipation (5975.71 kJ). Even ignoring the fan heat generation (retaining only the 6187.00 kJ of solar thermal collection), it still exceeds the heat dissipation by 212.29 kJ. This demonstrates that the system's heat collection capacity fully meets the battery insulation requirements, validating the feasibility of the daytime heating mode.

[0083] The solar thermal insulation system for electric vehicle power batteries in an embodiment of the present invention forms a solar heat collection cavity by integrating double-layer coated glass on the roof with sunshades, and uses air as a heat medium to achieve dynamic temperature control of the battery pack. The system heats the battery through closed air circulation in a low-temperature environment with sufficient sunlight, and switches to open air cooling and heat dissipation at high temperatures. This system not only effectively alleviates the problems of reduced cruising range and charge and discharge power caused by battery performance degradation in winter, but also saves a lot of battery preheating energy consumption, has low fan energy consumption, and has significant energy-saving and emission-reduction effects. The present invention has a simple structure and does not require modification of the existing vehicle body frame. It is suitable for pure electric and hybrid vehicles.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0085] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "N" means at least two, such as two, three, etc., unless otherwise specifically defined.

Claims

1. A solar thermal insulation system for electric vehicle power batteries, characterized in that: include: The roof sunshade device is used to absorb solar radiation energy and heat the air to obtain hot air working medium; A circulating fan is used to transport the hot air heated by the roof sunshade device to the battery pack, or to transport the cold air from the external environment to the battery pack, and to transport the hot air from the battery pack to the outside world; a circulation pipeline, one end of which is connected to the roof sunshade device, and the other end of which is connected to the battery pack via the circulation fan; The control module is used to generate a control signal according to the real-time temperature of the battery pack and the solar radiation intensity, and use the control signal to control the working mode of the roof sunshade device and the circulating fan to heat or dissipate heat for the battery pack.

2. The system according to claim 1, wherein: The roof sunshade device includes, from top to bottom, a roof light-transmitting layer, an air medium layer between the light-transmitting layers, a roof inner light-transmitting structure, a sealed air interlayer, a sunshade device heat-absorbing layer, and a sunshade device heat-insulating layer; air is heated in the sealed air interlayer to obtain hot air working medium.

3. The system according to claim 1, wherein: The circulating fan includes a forward start mode and a reverse start mode, and the forward start mode or the reverse start mode is selected to be turned on according to the control signal of the control module.

4. The system according to claim 1 or 3, characterized in that The control module is specifically used for: When the real-time temperature of the battery pack is less than or equal to a first preset temperature and the solar radiation intensity is greater than a preset value, a heating control signal is generated to control the deployment of the roof sunshade device and to control the forward mode of the circulating fan to transport the hot air working medium generated by the roof sunshade device to the battery pack to heat the battery pack; When the real-time temperature of the battery pack is less than or equal to the first preset temperature and the solar radiation intensity is less than or equal to the preset value, a heat preservation control signal is generated to control the roof sunshade device to be retracted and the circulation fan to be turned off; When the real-time temperature of the battery pack is greater than or equal to a second preset temperature, a heat dissipation control signal is generated to control the roof sunshade device to be folded, and the circulating fan is controlled to operate in reverse mode to draw in cold air from the external environment and deliver it to the battery pack to cool the battery pack, wherein the second preset temperature is higher than the first preset temperature.

5. The system according to claim 4, characterized in that The control module is further configured to adjust the rotation speed of the circulation fan according to temperature changes during the heating and cooling processes of the battery pack.

6. The system according to claim 1, wherein: The circulation pipeline is arranged in a hidden manner along the vehicle body.

7. The system according to claim 1, wherein: A temperature-equalizing air duct is set inside the battery pack, and the guide structure ensures that the hot air is evenly distributed between the battery cells.

8. The system according to claim 1, wherein: The circulation pipeline includes a heat medium circulation pipeline, a heat dissipation mode exhaust channel and a heat dissipation mode cold air intake channel. The heat medium circulation pipeline is connected between the roof sunshade device and the battery pack through the circulation fan to transport hot air working medium to heat the battery pack; The heat dissipation mode exhaust channel and the heat dissipation mode cold air intake channel are respectively connected to the two ends of the battery pack through the circulating fan. The heat dissipation mode cold air intake channel is used to input cold air, and the heat dissipation mode exhaust channel is used to discharge hot air to cool the battery pack.

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