Air cooling structure for strengthening heat dissipation of lithium battery

Abstract

The invention relates to the technical field of lithium battery heat dissipation, in particular to an air cooling structure for strengthening lithium battery heat dissipation, which comprises a box body, a heat exchange assembly for conducting heat on a plurality of lithium battery modules is arranged on the top surface of the box body, heat dissipation fins are arranged in the circumferential direction of the heat exchange assembly, and the heat dissipation fins abut against the lithium battery modules. The interior of the box body is divided into an air inlet cavity and an air outlet cavity through a flow guide grid, and one end of the heat exchange assembly extends into the air outlet cavity. The two opposite long side plates of the box body are respectively provided with a ventilation opening, a fan is installed on each ventilation opening, one ventilation opening is communicated with the air inlet cavity, and the other ventilation opening is communicated with the air outlet cavity. According to the invention, air in the air inlet cavity can be uniformly distributed in the air outlet cavity through the flow guide grid, so that air in the air outlet cavity can effectively take away heat transferred by the heat exchange assembly and discharge the heat out of the box body; and the heat dissipation efficiency can be effectively improved, so that the lithium battery module can work in a proper temperature range, and the discharge efficiency and the cycle life of the lithium battery are effectively improved and prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery heat dissipation, and in particular to an air cooling structure for enhancing lithium battery heat dissipation. Background Art

[0002] Lithium batteries, as high-energy-density, long-life, and environmentally friendly energy storage devices, have been widely used in a variety of fields, including portable electronic devices, electric vehicles, and energy storage systems. With technological advancements and the global pursuit of clean energy, the performance requirements for lithium batteries continue to increase, especially in terms of energy density, cycle life, and safety. However, the performance and safety of lithium batteries are significantly affected by their operating temperature. Excessively high or low temperatures can lead to decreased battery performance and even cause safety accidents.

[0003] The necessity and importance of lithium battery thermal management cannot be ignored. With the increase in battery capacity and the diversification of application environments, the issue of battery temperature control has become increasingly prominent. First, lithium batteries generate a large amount of heat during the charging and discharging process. If heat cannot be effectively dissipated, the internal temperature of the battery will exceed expectations, potentially causing thermal runaway, leading to battery short circuits, bulging, and even serious safety hazards such as fire or explosion. This is especially true in energy storage systems, where the large number of batteries and their high power generate even more heat, while the space for heat dissipation is limited. Therefore, thermal management is crucial to ensuring the continued safe operation of energy storage systems.

[0004] Secondly, thermal management is also crucial for improving battery performance and extending battery life. The ideal operating temperature for lithium batteries is typically between 20-45°C. Temperatures that are too high or too low can affect the battery's discharge capacity and lifespan. Effective thermal management can control battery temperature and maintain it within the optimal operating temperature range, thereby improving the battery's discharge efficiency and cycle life. Therefore, an efficient lithium battery thermal management system is crucial for ensuring battery pack performance, improving system safety, and extending battery life.

[0005] Currently, lithium battery thermal management primarily relies on air cooling, liquid cooling, and phase change material cooling. The advantages of air cooling include simple equipment, low cost, easy maintenance, and strong environmental adaptability. It requires no additional coolant or water, has relatively low environmental requirements, and is particularly advantageous in environments with water shortages or water resource constraints. Applications for air cooling to manage lithium battery thermal management primarily include small energy storage systems and portable electronic devices. In these applications, air cooling technology removes heat generated by the battery through air convection or forced convection, achieving temperature control.

[0006] However, existing air cooling technology also has some drawbacks, such as relatively poor heat transfer and low cooling efficiency. As the performance of energy storage systems and portable electronic devices continues to improve and their application scenarios become increasingly diverse, the development of more efficient heat exchange technologies has become crucial. This not only significantly improves the device's heat dissipation efficiency and ensures stable operation in extreme environments, but also effectively extends its service life and reduces energy consumption, while meeting the market's urgent demand for higher performance, more compact design, and greater reliability and safety.

[0007] Therefore, there is an urgent need for an air-cooling structure that enhances the heat dissipation of lithium batteries, which can not only effectively improve the stability of the lithium battery module, but also effectively improve the heat dissipation efficiency, enable the lithium battery module to operate within an appropriate temperature range, and effectively improve the discharge efficiency and cycle life of the lithium battery. Summary of the Invention

[0008] The purpose of the present invention is to provide an air cooling structure for enhancing heat dissipation of lithium batteries, so as to solve the problems existing in the above-mentioned prior art.

[0009] To achieve the above-mentioned objectives, the present invention provides the following solutions: an air-cooling structure for enhancing the heat dissipation of lithium batteries, comprising a box body, a heat exchange component for conducting heat to a plurality of lithium battery modules is provided on the top surface of the box body, cooling fins are provided on the circumference of the heat exchange component, the cooling fins are in contact with the lithium battery modules, the box body is divided into an air inlet chamber and an air outlet chamber by a guide grille, and one end of the heat exchange component extends into the air outlet chamber; ventilation holes are respectively provided on two opposite long side panels of the box body, a fan is installed on each of the ventilation holes, one ventilation hole is connected to the air inlet chamber, and the other ventilation hole is connected to the air outlet chamber.

[0010] Preferably, the two opposite short side panels of the box body are arranged at an angle, and the two opposite short side panels of the two box bodies are arranged parallel to each other.

[0011] Preferably, the air inlet cavity and the air outlet cavity are respectively trapezoidal.

[0012] Preferably, the heat exchange assembly includes a plurality of temperature averaging plates, each of the lithium battery modules is arranged between two adjacent temperature averaging plates, and two sides of the lithium battery module are respectively in contact with the temperature averaging plates.

[0013] Preferably, the top surface of the temperature averaging plate is flush with the top surface of the lithium battery module, and the height of the temperature averaging plate is greater than the height of the lithium battery module.

[0014] Preferably, the upper portion of the temperature averaging plate is an evaporation section, and the lower portion of the temperature averaging plate is a condensation section. The evaporation section abuts against the lithium battery module, and the condensation section extends into the air outlet cavity.

[0015] Preferably, a plurality of slots are provided on the top plate of the box body, and the slots are arranged in a one-to-one correspondence with the temperature equalizing plates.

[0016] Preferably, a plurality of second limiting grooves are provided on the bottom plate of the box body, and the second limiting grooves are arranged in a one-to-one correspondence with the slots.

[0017] Preferably, both sides of the guide grille are slidably connected with first limiting grooves, and the first limiting grooves are opened on the inner wall of the box body.

[0018] Preferably, the guide grille is provided with a plurality of through holes.

[0019] The present invention discloses the following technical effects:

[0020] The present invention uses a guide grille to evenly distribute the wind in the air inlet chamber in the air outlet chamber, so that the wind in the air outlet chamber can effectively take away the heat transferred by the heat exchange component and discharge it out of the box; at the same time, the heat transfer and dissipation are facilitated through the heat dissipation fins and the heat exchange component; and the lithium battery module can be effectively cooled.

[0021] The present invention can effectively improve the heat dissipation efficiency through the guide grid, heat exchange component and heat dissipation fins, so that the lithium battery module can operate within a suitable temperature range, and effectively improve the discharge efficiency and cycle life of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the lithium battery module and the temperature equalizing plate of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the temperature equalizing plate of the present invention;

[0026] Figure 4 This is a schematic diagram of the box structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the internal structure of the box of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the guide grid of the present invention;

[0029] Figure 7 Schematic diagram of the honeycomb-shaped through-hole structure of the present invention;

[0030] Figure 8 Schematic diagram of the square through-hole structure of the present invention;

[0031] Figure 9 Schematic diagram of the triangular through-hole structure of the present invention;

[0032] Figure 10 Schematic diagram of the variable diameter through hole structure of the present invention;

[0033] Figure 11 Schematic diagram of the through-hole structure of the guide grille fan with different densities according to the present invention;

[0034] Figure 12 This is a structural diagram of embodiment 2 of the present invention;

[0035] Figure 13 This is a structural diagram of embodiment 3 of the present invention;

[0036] Figure 14 This is a structural diagram of a fourth embodiment of the present invention;

[0037] Among them, 1. lithium battery module; 2. box body; 3. heat sink fin; 11. temperature plate; 12. evaporation section; 13. condensation section; 21. guide grille; 22. first limit groove; 23. top plate; 24. slot; 25. bottom plate; 26. second limit groove; 27. vent; 28. fan; 29. ​​through hole. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] Reference Figures 1-11The present invention provides a structure for enhancing the heat dissipation of lithium batteries, including a box body 2. A heat exchange component for conducting heat to a plurality of lithium battery modules 1 is provided on the top surface of the box body 2. Heat dissipation fins 3 are provided on the circumference of the heat exchange component. The heat dissipation fins 3 are in contact with the lithium battery modules 1. The inside of the box body 2 is divided into an air inlet chamber and an air outlet chamber by a guide grille 21. One end of the heat exchange component extends into the air outlet chamber; ventilation holes 27 are respectively provided on the two opposite long side panels of the box body 2. Fans 28 are installed on the ventilation holes 27. One ventilation hole 27 is connected to the air inlet chamber, and the other ventilation hole 27 is connected to the air outlet chamber.

[0041] A lithium battery module 1 is a power supply unit composed of multiple lithium battery cells connected in series and parallel via conductive connectors. It is secured in its designed position through process and structure, collaboratively performing the functions of charging, discharging, and storing electrical energy. The primary functions of a lithium battery module 1 are connection, fixation, and safety protection. Its structural design must support, secure, and protect the battery cells while meeting requirements for mechanical strength, electrical performance, thermal performance, and fault handling capabilities.

[0042] The heat dissipation fins 3 can dissipate heat through forced convection or natural convection.

[0043] In order to ensure close contact between the heat dissipation fins 3 and the lithium battery module 1, a layer of thermal conductive silicone grease or thermal interface material is applied to the contact interface between the heat dissipation fins 3 and the lithium battery module 1, thereby minimizing the contact thermal resistance and improving the thermal conductivity efficiency.

[0044] In order to effectively improve the fluidity of the gas, the fan 28 installed on the vent 27 connected to the air inlet chamber is used to supply air, and the fan 28 installed on the vent 27 connected to the air outlet chamber is used to exhaust air; so that the airflow in the air inlet chamber and the air outlet chamber can be more evenly distributed, effectively avoiding the uneven flow field caused by the direct action of the fan 28 on the heat exchange component.

[0045] The working principle of the guide grid 21 mainly involves the basic principles of fluid dynamics. The guide grid 21 is usually composed of a series of parallel or intersecting slats or grids, and its main purpose is to change the flow direction of the fluid (such as gas or liquid) to make it more orderly and uniform.

[0046] The special structural design of the flow guide grid 21 changes the originally chaotic flow direction of the fluid passing through the grid to become more orderly and uniform. This change can reduce the resistance of the fluid and improve the flow efficiency of the fluid.

[0047] The present invention uses the guide grille 21 to evenly distribute the wind in the air inlet chamber in the air outlet chamber, so that the wind in the air outlet chamber can effectively take away the heat transferred by the heat exchange component and discharge it outside the box body 2; at the same time, the heat transfer and dissipation are facilitated through the heat dissipation fins 3 and the heat exchange component; and the lithium battery module 1 can be effectively cooled.

[0048] The present invention can effectively improve the heat dissipation efficiency through the guide grid 21, the heat exchange component and the heat dissipation fins 3, so that the lithium battery module can operate within a suitable temperature range, and effectively improve the discharge efficiency and cycle life of the lithium battery.

[0049] According to a further optimized solution, the two opposite short side panels of the box body 2 are arranged at an angle, and the two opposite short side panels of the two box bodies 2 are arranged parallel to each other.

[0050] Further optimizing the solution, the air inlet cavity and the air outlet cavity are respectively trapezoidal.

[0051] By arranging the two opposite short side panels of the box body 2 in parallel and tilted to each other, the air inlet cavity and the air outlet cavity are respectively trapezoidal, the air duct of the air inlet cavity is contracting, and the air duct of the air outlet cavity is gradually expanding, which can effectively prevent the air flow backflow caused by a sudden drop in flow rate and effectively improve the heat exchange efficiency.

[0052] In a further optimized solution, the heat exchange assembly includes several temperature averaging plates 11, and each lithium battery module 1 is placed between two adjacent temperature averaging plates 11, with both sides of the lithium battery module 1 respectively contacting the temperature averaging plates 11. Thus, each lithium battery module 1 has a temperature averaging plate 11 on both sides.

[0053] The temperature uniform plate 11 is a rectangular cavity formed by welding two substrates.

[0054] The temperature equalizing plate 11, also known as a heat conducting plate or a superheat conducting plate, is a component used for thermal management. Its function and working principle are consistent with those of a heat pipe. It achieves rapid temperature equalization through the evaporation and condensation cycle of the actuating fluid enclosed in the plate-shaped cavity, thereby having the functions of rapid heat conduction and heat diffusion.

[0055] The vapor chamber 11 is a vacuum chamber with a microstructured inner wall, typically made of copper. When heat is transferred from the heat source to the evaporation zone, the coolant in the chamber begins to vaporize in the low vacuum environment. This vapor absorbs heat energy and rapidly expands, quickly filling the entire chamber. When the gaseous working medium comes into contact with a relatively cold area, it condenses, releasing the heat accumulated during evaporation. The condensed coolant then flows back to the evaporation heat source through the microstructured capillaries, repeating this process repeatedly within the chamber.

[0056] The structure of the temperature plate 11 is as follows:

[0057] Shell: Usually made of materials with high thermal conductivity, such as copper, to ensure that heat can be quickly transferred to the working fluid inside.

[0058] Capillary structure: Common types include micro-groove type, sintered powder type, and sintered wire mesh type. The micro-groove type uses grooves machined on the wall of the heat spreader to serve as recirculation channels, reducing flow resistance. However, the preparation process is complex and the cost is high. The sintered powder type directly sinters metal powder onto the inner wall of the plate, providing a strong capillary force. It has the widest application range and the most mature technology, but its disadvantage is poor permeability. The sintered wire mesh type uses wire mesh sintered onto the inner wall of the plate. The pores of the wire mesh can be controlled, and it has the advantages of simple structure, easy manufacturing, and low cost. However, its disadvantage is that there are gaps between the mesh layers and between the wire mesh and the tube wall, resulting in high thermal resistance.

[0059] Working fluid: This changes over the application temperature range and must be compatible with the vapor chamber housing and capillary structure materials. For example, copper-water VC most commonly operates at temperatures from approximately 10°C to 250°C, but other fluids can be used for extreme temperature ranges.

[0060] The vapor chamber 11 can make the surface temperature more uniform, reduce the generation of hot spots, and thus improve the performance and reliability of electronic equipment. In addition to the traditional function of a heat pipe, it can effectively transfer heat from the heat source to the heat dissipation area. It also has a rapid heat diffusion function. In thermal management applications, it can quickly convert high heat flux points into low heat flux surfaces.

[0061] In a further optimized solution, the top surface of the temperature averaging plate 11 is flush with the top surface of the lithium battery module 1, and the height of the temperature averaging plate 11 is greater than the height of the lithium battery module 1, so that the lower part of the temperature averaging plate 11 can effectively extend into the air outlet cavity.

[0062] In a further optimization scheme, the upper portion of the temperature evaporating plate 11 is the evaporation section 12, and the lower portion of the temperature evaporating plate 11 is the condensation section 13. The evaporation section 12 abuts the lithium battery module 1, and the condensation section 13 extends into the air outlet cavity. The evaporation section 12 of the temperature evaporating plate 11 is tightly abutted against the lithium battery module 1, and the condensation section 13 of the temperature evaporating plate 11 extends into the air outlet cavity, allowing the gas in the air outlet cavity to exchange heat with the condensation section 13.

[0063] By directly embedding the evaporation section 12 of the temperature equalizing plate 11 between the lithium battery modules 1, the efficient heat conduction characteristics of the evaporation section 12 of the temperature equalizing plate 11 are utilized to quickly absorb the heat generated by the lithium battery module 1; the condensation section 13 of the temperature equalizing plate 11 extends out of the lithium battery module 1 to facilitate heat transfer and dissipation.

[0064] In order to ensure close contact between the temperature averaging plate 11 and the lithium battery module 1, a layer of thermal grease or thermal interface material is applied to the contact interface between the temperature averaging plate 11 and the lithium battery module 1, thereby minimizing the contact thermal resistance and improving the thermal conductivity efficiency.

[0065] The thickness of the temperature homogenizing plate 11 does not exceed 2 mm, which can effectively reduce its volume and weight.

[0066] According to a further optimized solution, a plurality of slots 24 are provided on the top plate 23 of the box body 2 , and the slots 24 are arranged in a one-to-one correspondence with the temperature equalizing plates 11 .

[0067] The condensing section 13 of the temperature equalizing plate 11 can pass through the slot 24 and extend into the air outlet cavity. At the same time, the bottom of the lithium battery module 1 is in contact with the top plate 23 of the box body 2, so that the top plate 23 of the box body 2 can effectively support the lithium battery module 1.

[0068] As a further optimization, the bottom plate 25 of the housing 2 is provided with a plurality of second limiting grooves 26, each corresponding to the slots 24. The end of the condensing section 13 of the vapor chamber 11 extending into the ventilation cavity is inserted into the second limiting grooves 26. These second limiting grooves 26 restrain the condensing section 13 of the vapor chamber 11, preventing it from moving or vibrating due to airflow.

[0069] In a further optimized solution, first limiting grooves 22 are respectively slidably connected to both sides of the guide grille 21, and the first limiting grooves 22 are opened on the inner wall of the box body 2. The first limiting grooves 22 facilitate the installation and removal of the guide grille 21.

[0070] A plurality of first limiting slots 22 are provided. By inserting the guide grilles 21 into different first limiting slots 22 , the air flow characteristics can be changed, thereby achieving the purpose of adjusting the heat exchange characteristics.

[0071] As a further optimization, the guide grille 21 is provided with a plurality of through holes 29. These through holes 29 are evenly distributed on the guide grille 21, allowing air to pass through the tapered air inlet cavity and the guide grille 21, evenly directing the airflow to the condensing section of the temperature homogenizer 11. This effectively prevents excessive or weak airflow in certain areas and reduces the generation of vortices and dead spots.

[0072] Reference Figure 6-Figure 9 The through holes 29 can be arranged in a circular, square, honeycomb or triangular shape, which helps to evenly disperse the airflow and reduce the phenomenon of gas deviation. Among them, the honeycomb grid structure has higher strength and lower flow resistance.

[0073] Reference Figure 10 In order to adapt to the air duct in the tapered air inlet cavity, the apertures of the several evenly distributed through holes 29 opened on the guide grille 21 are arranged from large to small, that is, the aperture of the through hole 29 close to the vent 27 is the largest. The variable diameter through holes 29 can effectively improve the uniform distribution of airflow and reduce the phenomenon of local flow velocity being too high or too low.

[0074] Reference Figure 11In order to adapt to the air passage in the tapered air inlet cavity, the arrangement density of the through holes 29 in different areas of the guide grille 21 is different. For example, the arrangement density of the through holes 29 in the central area of ​​the guide grille 21 is low, and the arrangement density of the through holes 29 in the areas on both sides of the central area of ​​the guide grille 21 is high, which can effectively make the airflow distribution more uniform.

[0075] The present invention embeds a temperature averaging plate 11 with excellent heat exchange performance and good temperature uniformity into the lithium battery module 1, and makes the temperature averaging plate 11 form close contact with the lithium battery module 1; the evaporation section 12 of the temperature averaging plate 11 is directly embedded between the lithium battery modules 1, and utilizes the efficient heat conduction characteristics of the evaporation section 12 of the temperature averaging plate 11 to quickly absorb the heat generated by the lithium battery module 1, and the condensation section 13 of the temperature averaging plate 11 extends out of the lithium battery module 1 to facilitate heat transfer and dissipation; effectively improving the heat dissipation efficiency of the lithium battery module 1.

[0076] In order to dissipate the heat of the condensing section 13 of the temperature equalizing plate 11 more efficiently, the air inlet cavity adopts a gradually contracting type and the air outlet cavity adopts a gradually expanding type, so that the air flow distribution is more uniform and the heat exchange efficiency is improved; at the same time, the guide grille 21 arranged in the box body 2 can evenly guide the airflow to the condensing section 13 of the temperature equalizing plate 11, effectively avoiding the problem of excessive or weak airflow in certain areas.

[0077] The present invention uses guide grilles 21 with different cross-sections and shapes, such as circular, square, honeycomb or triangular, as well as through holes 29 with variable diameters and through holes 29 with variable spacing; it can adjust the airflow characteristics according to actual needs, and then adjust the heat exchange characteristics, so that the heat dissipation effect is further optimized.

[0078] The present invention also utilizes heat dissipation fins 3 to dissipate heat from the other two side surfaces of the lithium battery module 1 and the outermost temperature averaging plate 11 ; the heat dissipation effect of the lithium battery module 1 is improved by the heat dissipation fins 3 and the heat exchange assembly.

[0079] The present invention can achieve efficient heat dissipation in a limited space through the temperature equalizing plate 11, the box body 2 and the heat dissipation fins 3, and is suitable for a lithium battery system with high energy density.

[0080] Example 2

[0081] Reference Figure 12 In order to improve the uniformity of gas flow, several guide grilles 21 are installed, and the positions of the through holes 29 of adjacent guide grilles 21 are staggered. That is, after the airflow enters the air inlet cavity, it passes through several guide grilles 21 and then enters the air outlet cavity, so that the airflow is divided and merged through multiple guide grilles 21, which helps to improve the flow uniformity.

[0082] Example 3

[0083] Reference Figure 13The difference between this embodiment and the first embodiment is that both fans 28 are used for air supply, that is, when one fan 28 is working, the other fan 28 is not working. At the same time, the temperature homogenizing plates 11 are arranged relative to each other, dividing the interior of the box 2 into two air inlet chambers and one air outlet chamber, and the air outlet chamber is located between the two air inlet chambers; when one fan 28 is working, the gas enters the air inlet chamber connected to the fan 28 through the fan 28, and the gas in the air inlet chamber enters the air outlet chamber through the guide grille 21, and the gas undergoes heat exchange with the condensation section 13 of the temperature homogenizing plate 11, and the gas after heat exchange is discharged out of the box 2 through the other air inlet chamber.

[0084] Example 4

[0085] Reference Figure 14 The difference between this embodiment and the third embodiment is that a plurality of guide grilles 21 are installed, and the positions of the through holes 29 of adjacent guide grilles 21 are staggered, so that the airflow passes through multiple guide grilles 21 to be divided and merged, which helps to improve the flow uniformity.

[0086] When a fan 28 is working, the gas enters the air inlet chamber connected to the fan 28 through the fan 28, and the gas in the air inlet chamber passes through multiple guide grilles 21 and enters the air outlet chamber, and the gas undergoes heat exchange with the condensation section 13 of the temperature equalizing plate 11. After the heat exchange, the gas passes through multiple guide grilles 21 and enters another air inlet chamber, and the airflow is discharged outside the box 2.

[0087] The present invention can be flexibly adjusted according to actual needs. By changing the shape and number of the guide grilles 21 and adjusting the size and power of the fan 28, it can adapt to lithium battery modules 1 of different sizes and powers and effectively dissipate heat for the lithium battery modules 1.

[0088] Example 5

[0089] The difference between this embodiment and embodiment 4 is that, in order to enable the lithium battery module 1 to operate at a suitable temperature in a low temperature state, a heating element is provided in the air inlet chamber, and the heating element is connected to the vent 27; when the lithium battery module 1 is in a low temperature environment, the air entering the vent 27 is heated by the heating element; the heated air enters the air outlet chamber through the air inlet chamber, so that the hot air in the air outlet chamber exchanges heat with the condensation section of the temperature equalizing plate 11, and the heat can be transferred to the lithium battery module 1 through the temperature equalizing plate 11, thereby heating the lithium battery module 1 and enabling the lithium battery module 1 to achieve a low-temperature cold start; enabling the lithium battery module 1 to operate at a suitable temperature in a low-temperature state.

[0090] Embodiments 1 to 4 are mainly used for heat dissipation, and embodiment 5 is mainly used for heating. By combining embodiments 1 to 5, the present invention forms a thermal management system; the present invention can not only dissipate heat for the lithium battery module 1 by introducing air into the environment; it can also heat the cold air at low temperatures and exchange heat through the temperature equalizing plate 11, so that the temperature equalizing plate 11 can effectively heat the lithium battery module 1; the present invention effectively realizes thermal management of the lithium battery module 1.

[0091] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0092] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. An air cooling structure for enhancing heat dissipation of lithium batteries, characterized in that: The invention comprises a box body (2), wherein a heat exchange component for conducting heat to a plurality of lithium battery modules (1) is arranged on the top surface of the box body (2), heat dissipation fins (3) are arranged on the circumference of the heat exchange component, the heat dissipation fins (3) are in contact with the lithium battery modules (1), the box body (2) is divided into an air inlet chamber and an air outlet chamber by a guide grille (21), and one end of the heat exchange component extends into the air outlet chamber; Two long side panels opposite to each other of the box body (2) are respectively provided with ventilation holes (27), each of which is provided with a fan (28), one of the ventilation holes (27) is connected to the air inlet cavity, and the other of the ventilation holes (27) is connected to the air outlet cavity.

2. The air cooling structure for enhancing heat dissipation of lithium batteries according to claim 1, characterized in that: The two opposite short side panels of the box body (2) are arranged obliquely, and the two opposite short side panels of the two box bodies (2) are arranged parallel to each other.

3. The air cooling structure for enhancing heat dissipation of lithium batteries according to claim 1, characterized in that: The air inlet cavity and the air outlet cavity are respectively trapezoidal.

4. The air cooling structure for enhancing heat dissipation of lithium batteries according to claim 1, characterized in that: The heat exchange assembly comprises a plurality of temperature averaging plates (11), each of the lithium battery modules (1) is arranged between two adjacent temperature averaging plates (11), and two sides of the lithium battery module (1) are respectively in contact with the temperature averaging plates (11).

5. The air cooling structure for enhancing heat dissipation of lithium batteries according to claim 4, characterized in that: The top surface of the temperature averaging plate (11) is flush with the top surface of the lithium battery module (1), and the height of the temperature averaging plate (11) is greater than the height of the lithium battery module (1).

6. The air cooling structure for enhancing heat dissipation of lithium batteries according to claim 5, characterized in that: The upper portion of the temperature equalizing plate (11) is an evaporation section (12), and the lower portion of the temperature equalizing plate (11) is a condensation section (13); the evaporation section (12) abuts against the lithium battery module (1), and the condensation section (13) extends into the air outlet cavity.

7. The air cooling structure for enhancing heat dissipation of lithium batteries according to claim 6, characterized in that: A plurality of slots (24) are provided on the top plate (23) of the box body (2), and the slots (24) are arranged in one-to-one correspondence with the temperature equalizing plates (11).

8. The air cooling structure for enhancing heat dissipation of lithium batteries according to claim 7, characterized in that: A plurality of second limiting grooves (26) are provided on the bottom plate (25) of the box body (2), and the second limiting grooves (26) are arranged in one-to-one correspondence with the slots (24).

9. The air cooling structure for enhancing heat dissipation of lithium batteries according to claim 1, characterized in that: The two sides of the guide grille (21) are respectively slidably connected with first limiting grooves (22), and the first limiting grooves (22) are opened on the inner wall of the box body (2).

10. The air cooling structure for enhancing heat dissipation of lithium batteries according to claim 9, characterized in that: The guide grid (21) is provided with a plurality of through holes (29).

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