Soft package lithium battery cell heat dissipation system and unmanned aerial vehicle battery module

Abstract

The invention relates to the technical field of batteries, in particular to a soft package lithium battery cell heat dissipation system and an unmanned aerial vehicle battery module.The soft package lithium battery cell heat dissipation system comprises a ventilation module, a power distribution module and a heat dissipation grating, and the ventilation module is provided with flow guide holes and convection holes in the horizontal direction; a connecting pipe communicated with the flow guide hole is arranged at the lower part of the ventilation module; the lower end of the heat-conducting silica gel sheet fits the first circuit board, and the upper end of the heat-conducting silica gel sheet fits the ventilation module; the heat dissipation grid is provided with heat dissipation fins, battery cells are attached to the two sides of the heat dissipation fins respectively, and heat conduction cavities are formed in the positions, corresponding to the centers of the battery cells, in the heat dissipation fins; first radiating holes are formed in the upper part of the heat-conducting cavity, and second radiating holes are formed in the lower part of the heat-conducting cavity; the lower end of the connecting pipe penetrates through the heat-conducting silica gel sheet and the first circuit board to communicate with the first heat dissipation hole. Through the structural design, the heat dissipation effect is improved, local overheating is avoided, the performance and safety of the battery are guaranteed, and the overall service life of the battery is prolonged.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more specifically, to a heat dissipation system for a soft-pack lithium battery cell and a drone battery module. Background Technology

[0002] Currently, lithium battery pack cooling mechanisms are mainly divided into active and passive cooling. Active cooling includes forced air cooling and liquid cooling, and includes cooling methods such as thermally conductive material cooling, thermal radiation cooling, and phase change material cooling. Active cooling is characterized by high heat dissipation efficiency, but the system is relatively complex. Because active cooling requires external energy and uses devices such as fans and pumps to drive the cooling medium to flow and remove heat, the system is usually relatively large and is typically used in large and medium-sized UAV battery systems. Passive cooling does not rely on external energy input and dissipates heat solely through natural convection or the inherent properties of the thermally conductive materials. Its characteristics include simple structure, no operating energy consumption, and high reliability, and it is commonly used in small and medium-sized UAV battery systems. However, the heat dissipation capacity of passive cooling is relatively limited. With the rapid development of flight control technology for small and medium-sized UAVs, there are higher requirements for endurance and maneuverability; therefore, existing battery system cooling systems can no longer meet these requirements. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a heat dissipation system for pouch lithium battery cells and a drone battery module, which aims to provide a heat dissipation system for pouch lithium battery cells and a drone battery module to cope with the highly uneven internal heat generated by pouch lithium battery cells during high-power discharge, thereby avoiding local overheating, ensuring battery performance and safety, and extending its overall service life.

[0004] In a first aspect, the present invention proposes a heat dissipation system for soft-pack lithium battery cells.

[0005] A heat dissipation system for a pouch lithium battery cell according to an embodiment of the present invention includes: A ventilation module is provided with at least one guide hole in the horizontal direction, and convection holes are provided on both sides of the guide hole; a connecting pipe is provided at the lower part of the ventilation module, and the axis of the connecting pipe is perpendicular to the axis of the guide hole; the connecting pipe communicates with the guide hole. A power distribution module is provided with a first circuit board and a thermally conductive silicone pad. The lower end of the thermally conductive silicone pad is attached to the first circuit board, and the upper end of the thermally conductive silicone pad is attached to the ventilation module. A heat dissipation grille is provided with at least one heat dissipation fin. A battery cell is attached to both sides of the heat dissipation fin. A heat conduction cavity is provided in the heat dissipation fin at the center position corresponding to the battery cell. A first heat dissipation hole is provided at the upper part of the heat conduction cavity, and a second heat dissipation hole is provided at the lower part of the heat conduction cavity. The lower end of the connecting pipe passes through the thermally conductive silicone sheet and the first circuit board and communicates with the first heat dissipation hole.

[0006] According to some embodiments of the present invention, the longitudinal section of the convection hole is rectangular; the longitudinal section of the guide hole is circular, and guide slopes are provided at the outer edges on both sides of the guide hole.

[0007] According to some embodiments of the present invention, a guiding slope is provided at the connection between the connecting pipe and the guide hole. The guiding slope forms a guiding area above the connecting pipe. The guiding area penetrates the guide path of the guide hole. The guiding area is a cone formed by rotating the maximum cross section of the projection of the guiding slope in the vertical direction around the axis.

[0008] According to some embodiments of the present invention, m second heat dissipation holes are provided in the vertical direction, the sum of the cross-sectional areas of the m second heat dissipation holes is greater than or equal to the cross-sectional area of ​​the first heat dissipation hole, and the cross-sectional area of ​​the first heat dissipation hole is a flat elliptical structure, wherein m≥1.

[0009] According to some embodiments of the present invention, connecting blocks are respectively provided on both sides of the heat dissipation grille, and vent holes are provided on the connecting blocks corresponding to the second heat dissipation holes, and sealing sleeves are provided on the vent holes.

[0010] According to some embodiments of the present invention, baffles are respectively provided on both sides of the heat sink.

[0011] According to some embodiments of the present invention, the surface of the heat sink is provided with a plurality of heat dissipation grooves, and the plurality of heat dissipation grooves are distributed on the periphery of the heat conduction cavity; the heat sink forms a corrugated structure through the heat dissipation grooves on both sides.

[0012] According to some embodiments of the present invention, the heat sink is provided with a plurality of hollowed-out grooves.

[0013] According to some embodiments of the present invention, a heat insulation plate is further included, wherein a first heat insulation sheet is provided on both sides of the heat insulation plate, and a second heat insulation sheet is provided on the lower side of the heat insulation plate, wherein the first heat insulation sheet is attached to the side of the battery cell, and the second heat insulation sheet is attached to the bottom of the battery cell.

[0014] Secondly, the present invention provides a drone battery module, including a soft-pack lithium battery cell heat dissipation system as described in the first aspect.

[0015] A soft-pack lithium battery cell heat dissipation system and a drone battery module according to embodiments of the present invention have at least the following beneficial effects: According to the present invention, when the UAV flies at high speed, the air medium flows at high speed through the guide holes of the ventilation module. Based on Bernoulli's principle, the higher the flow velocity of the air medium, the lower the static pressure inside the guide holes, which can form a local low-pressure zone at the outlet of the connecting pipe. This low-pressure zone will have a suction effect on the hot air medium in the heat conduction cavity, accelerating the exhaust speed of the hot air from the heat conduction cavity through the connecting pipe to the outside, transforming traditional passive heat dissipation into a highly efficient, low-energy-consumption active heat dissipation.

[0016] According to the present invention, during high-power discharge, the heat in the central region of the battery cell causes the temperature of the air medium inside the heat-conducting cavity to rise rapidly. Based on the thermal chimney effect, the density of the hot air decreases and it rises, forming a high-temperature, low-pressure zone within the heat-conducting cavity. Simultaneously, the area at the flow guide hole is at ambient temperature, forming a low-temperature, high-pressure zone. The pressure difference between the two zones drives air to automatically flow from the high-pressure zone to the low-pressure zone. Specifically, the cold air medium enters through the second heat dissipation hole, absorbs heat through the heat-conducting cavity, becomes hot air, and is finally discharged through the first heat dissipation hole.

[0017] According to the present invention, Bernoulli's principle and the thermal chimney effect work synergistically. The thermal chimney effect establishes the basic air circulation flow, while Bernoulli's principle further enhances the flow rate and volume of the air medium. The combination of the two creates a rapid and continuous airflow inside the heat-conducting cavity, which can efficiently remove the heat accumulated in the central area of ​​the battery cell, avoiding local heat retention and improving heat dissipation efficiency.

[0018] According to the present invention, the tab of the battery cell serves as a current collection point. The tab is electrically connected to the first circuit board. The heat generated by the tab is concentrated on the first circuit board. The thermally conductive silicone sheet in the power distribution module is tightly attached to the first circuit board, which can conduct away the heat generated by the first circuit board itself during operation and also block the heat from other electronic components above, ensuring that the first circuit board operates at a suitable temperature and guaranteeing the reliability and service life of the first circuit board and the tab. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a drone battery module according to the present invention; Figure 2 This is a cross-sectional structural diagram of the drone battery module of the present invention; Figure 3 This is a schematic diagram of a heat dissipation system for a soft-pack lithium battery cell according to the present invention. Figure 4 This is a cross-sectional structural schematic diagram of the heat dissipation system for a soft-pack lithium battery cell according to the present invention; Figure 5For the present invention Figure 4 A cross-sectional structural diagram of AA; Figure 6 For the present invention Figure 5 A magnified view of the local structure at point B; Figure 7 This is a schematic diagram of a heat sink structure according to the present invention. Figure 8 This is a schematic diagram of an assembly structure of the battery cell and heat insulation board of the present invention.

[0020] In the picture: 100-Outer shell, 101-Air inlet, 110-Base plate, 111-Buffer pad, 120-End cap device, 121-Control button, 122-Second circuit board, 123-Power interface, 130-Battery cell, 131-Electrical tab; 200-Ventilation module, 201-Guide hole, 202-Convection hole, 203-Guide slope, 210-Connecting pipe; 300 - Power distribution module, 310 - First circuit board, 320 - Thermal conductive silicone pad; 400-Heat dissipation grille, 410-Heat dissipation fin, 411-Heat conduction cavity, 412-First heat dissipation hole, 413-Second heat dissipation hole, 414-Guiding slope, 415-Heat dissipation groove, 416-Hollow groove, 420-Connecting block, 421-Ventilation hole, 422-Sealing sleeve, 430-Baffle, 440-Heat insulation plate, 441-First heat insulation sheet, 442-Second heat insulation sheet. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0024] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0025] Reference Figures 1 to 8 As shown, this invention discloses a heat dissipation system for a soft-pack lithium battery cell and a drone battery module.

[0026] In a first aspect, the present invention discloses a heat dissipation system for a soft-pack lithium battery cell. The heat dissipation system includes a ventilation module 200, a power distribution module 300, and a heat dissipation grille 400. The ventilation module 200 has at least one guide hole 201 along the horizontal direction, and convection holes 202 are respectively provided on both sides of the guide hole 201. A connecting pipe 210 is provided at the lower part of the ventilation module 200, and the axis of the connecting pipe 210 is perpendicular to the axis of the guide hole 201. The connecting pipe 210 communicates with the guide hole 201. The power distribution module 300 is provided with a first circuit board 310 and thermally conductive silicone. The lower end of the thermally conductive silicone sheet 320 is attached to the first circuit board 310, and the upper end of the thermally conductive silicone sheet 320 is attached to the ventilation module 200. The heat dissipation grille 400 is provided with at least one heat sink 410. The two sides of the heat sink 410 are respectively attached to the battery cell 130. A heat-conducting cavity 411 is provided in the heat sink 410 corresponding to the center position of the battery cell 130. A first heat dissipation hole 412 is provided at the upper part of the heat-conducting cavity 411, and a second heat dissipation hole 413 is provided at the lower part of the heat-conducting cavity 411. The lower end of the connecting pipe 210 passes through the thermally conductive silicone sheet 320 and the first circuit board 310 and connects to the first heat dissipation hole 412.

[0027] Reference Figure 3 and Figure 4As shown, specifically in this embodiment, the heat dissipation system for the soft-pack lithium battery cell includes a ventilation module 200, a power distribution module 300, and a heat dissipation grille 400. The ventilation module 200 has two guide holes 201 arranged horizontally, and convection holes 202 are respectively arranged on both sides of the guide holes 201. A connecting pipe 210 is arranged at the lower part of the ventilation module 200, and the axis of the connecting pipe 210 is perpendicular to the axis of the guide holes 201. The connecting pipe 210 connects to the guide holes 201. The power distribution module 300 is provided with a first circuit board 310 and a thermally conductive silicone pad 320, with the lower end of the thermally conductive silicone pad 320 attached to the first circuit board 310. The upper end of the thermally conductive silicone pad 320 is attached to the ventilation module 200; the heat dissipation grille 400 is provided with three heat sinks 410, and four battery cells 130 are attached to the front and rear sides of the heat sinks 410 respectively. Every two battery cells 130 are symmetrically arranged on the same side of the heat sink 410. In this embodiment, there are a total of 12 battery cells 130. A heat-conducting cavity 411 is provided in the heat sink 410 at the center position corresponding to the battery cells 130. A first heat dissipation hole 412 is provided at the upper part of the heat-conducting cavity 411, and a second heat dissipation hole 413 is provided at the lower part of the heat-conducting cavity 411. In this embodiment, the axial direction of the first heat dissipation hole 412 and the axial direction of the second heat dissipation hole 413 are perpendicular to each other. In this embodiment, the tabs 131 of the battery cells 130 are electrically connected to the first circuit board 310.

[0028] Reference Figure 3 and Figure 4As shown, when the drone flies at high speed, the air medium flows at high speed through the guide hole 201 of the ventilation module 200. According to Bernoulli's principle, the air medium accelerates within the guide hole 201, causing its static pressure to decrease. This low-pressure environment forms a local low-pressure zone at the outlet of the connecting pipe 210. This low-pressure zone exerts a suction effect on the hot air medium within the heat-conducting cavity 411, i.e., an induction effect, thereby accelerating the discharge speed of the hot air medium from the heat-conducting cavity 411 through the connecting pipe 210. Simultaneously, during the drone's high-speed flight, the battery cell 130 discharges at high power, creating a local high-temperature zone in the central area of ​​the battery cell 130, causing the air medium temperature within the heat-conducting cavity 411 to rise rapidly. Based on the thermal chimney effect, the density of the heated air medium decreases and it rises, forming a high-temperature, low-pressure zone at the upper part of the heat-conducting cavity 411. A significant pressure difference is generated between this zone and the low-temperature, high-pressure zone at the guide hole 201. Pressure difference drives automatic air circulation: Cold air enters through the second heat dissipation hole 413 at the bottom of the heat-conducting cavity 411, absorbs heat after flowing through the heat-conducting cavity 411, and becomes hot air, which is finally discharged through the first heat dissipation hole 412 at the top of the heat-conducting cavity 411. Furthermore, the induced effect created by Bernoulli's principle and the thermal chimney effect work synergistically in this process. The thermal chimney effect establishes the basic circulation of air within the heat-conducting cavity 411, while Bernoulli's principle further enhances the rate and flow of this flow. The combined effect of these two factors creates a rapid and continuous airflow within the heat-conducting cavity 411, which can efficiently remove the heat accumulated in the central area of ​​the battery cell 130.

[0029] Specifically, in this embodiment, the total driving force of the soft-pack lithium battery cell heat dissipation system can be represented by the total pressure difference: ΔP is the formula for calculating the total pressure difference: ΔP = |P1| + |P2| Where P1 is the Bernoulli-induced pressure difference and P2 is the thermal chimney effect pressure difference; The Bernoulli-induced pressure difference P1 is determined by the air velocity V1 within the guide orifice 201; the formula for calculating P1 is: P1=(1 / 2)*ρ*V1*K1 Where ρ is the air density; K1 is the pressure loss coefficient related to the geometry of the guide hole 201 and the connecting pipe 210, and the value of K1 can be determined by aerodynamic simulation or experiment.

[0030] The pressure difference P2 due to the hot chimney effect is determined by the temperature difference ΔT inside and outside the heat-conducting cavity 411. The formula for calculating P2 is: P2=ρ*g*H*β*ΔT*K2 Where g is the acceleration due to gravity, H is the effective height at the outlet of the first heat dissipation hole 412 and the inlet of the second heat dissipation hole 413, β is the volumetric expansion coefficient of air, ΔT is the difference between the average temperature inside the heat conduction cavity 411 and the ambient temperature, and K2 is a coefficient related to the geometry of the heat conduction cavity 411, the value of which can be determined by aerodynamic simulation or experiment. In actual flow, the directions of the Bernoulli-induced pressure difference P1 and the thermal chimney effect pressure difference P2 are coordinated, jointly propelling the gas from the second heat dissipation hole 413 to the first heat dissipation hole 412 and out.

[0031] Furthermore, as the airflow passes through the entire path—the second heat dissipation hole 413, the heat conduction cavity 411, the first heat dissipation hole 412, and the connecting pipe 210—pressure losses occur due to friction, contraction, and expansion. The total pressure loss is proportional to the square of the flow velocity. The formula for calculating the system flow resistance P3 is: P3=(1 / 2)*ρ*V t 2 *K3 Among them, V t A characteristic flow velocity in the system, in this embodiment, can be the average flow velocity of the air in the first heat dissipation hole 412; K3 is the total drag coefficient, which is the sum of the local drag coefficients and friction drag coefficients of all components. It is a dimensionless number greater than 1, and K3 needs to be determined experimentally or through detailed calculations.

[0032] It is important to understand that when the system is running stably, the available pressure difference can be used entirely to overcome flow resistance, that is... ΔP = |P1| + |P2| = P3 The formula for calculating the mass M of fluid flowing through a certain cross-section per unit time is: M=ρ*A*V t Where A is a characteristic flow cross-sectional area in the system. In this embodiment, the characteristic flow velocity can be the cross-sectional area of ​​the first heat dissipation hole 412. Based on the law of conservation of energy, the heat dissipation capacity is calculated as follows: the system heat dissipation flow rate Φ is equal to the heat absorbed by the airflow; the formula for calculating the system heat dissipation flow rate Φ is: Φ=M*C p *ΔT Among them, C p Let be the specific heat capacity of air at constant pressure; the heat dissipation model of this system can be calculated using the above formula: Furthermore, the tab 131 of the battery cell 130 serves as a current collection point, and the heat generated at the tab 131 is concentrated on the first circuit board 310. The thermally conductive silicone sheet 320 in the power distribution module 300 is tightly attached to the first circuit board 310. The power distribution module 300 can conduct and dissipate the heat generated by the first circuit board 310 itself during operation through the thermally conductive silicone sheet 320, while blocking heat from other electronic components above, ensuring that the first circuit board 310 and the tab 131 operate stably at a suitable temperature.

[0033] Reference Figures 3 to 5 As shown, in some embodiments of the present invention, the longitudinal section of the convection hole 202 is rectangular; the longitudinal section of the guide hole 201 is circular, and guide slopes 203 are provided on the outer edges of both sides of the guide hole 201. Specifically, in this embodiment, the ventilation module 200 is provided with at least one guide hole 201 in the horizontal direction, and convection holes 202 are provided on both sides of the guide hole 201. In this embodiment, for ease of installation and modular configuration, the ventilation module 200 is configured as a rectangular block structure, and two circular guide holes 201 are provided on the ventilation module 200. At the same time, guide slopes 203 are provided on the outer edges of both sides of the guide hole 201, thus the entire guide hole 201 forms a Venturi structure. During operation, when the UAV flies at high speed, the air medium flows towards the ventilation module 200. The air medium first enters the guide slope 203 at the inlet of the guide hole 201, and this constricted channel forces the air to accelerate. According to Bernoulli's principle, as fluid velocity increases, its static pressure decreases. When air reaches the minimum cross-sectional area of ​​the guide hole 201, the velocity reaches its maximum, while the static pressure drops to its minimum. This extremely low-pressure zone formed at the throat acts on the outlet of the connecting pipe 210 below, creating a suction effect on the hot air in the heat-conducting cavity 411. The air medium flows out through the expansion section formed by the guide slope 203, where the velocity decreases and the pressure partially recovers, thus reducing flow resistance. The rectangular structure of the convection hole 202 typically has a large surface area and specific guiding properties. Its main function is to allow a large amount of cooling air to flow smoothly through the ventilation module 200. The airflow through the rectangular channel can carry away the heat transferred from the power distribution module 300 to the ventilation module 200 via thermal conduction, achieving auxiliary heat dissipation for the tab 131 area.

[0034] Reference Figure 3 and Figure 6As shown, in some embodiments of the present invention, a guiding slope 414 is provided at the connection between the connecting pipe 210 and the guide hole 201. The guiding slope 414 forms a guiding region above the connecting pipe 210, and the guiding region intrudes into the guiding path of the guide hole 201. The guiding region is a cone formed by rotating the maximum cross-section of the projection of the guiding slope 414 in the vertical direction around its axis. Specifically, in this embodiment, when the vertical connecting pipe 210 is connected to the horizontal guide hole 201, the high-speed air medium flowing in the guide hole 201 forms a 90-degree angle with the air medium attempting to be extracted from the connecting pipe 210. Without a transition structure, the two airflows would cause severe mutual interference and impact, resulting in significant turbulence and pressure loss, thereby severely weakening the suction efficiency. In this embodiment, by providing the guiding slope 414, a smooth, gradual path is provided, allowing the air medium in the connecting pipe 210 to smoothly integrate into the main airflow of the guide hole 201. The guiding slope 414 eliminates the inherent flow separation and dead zone at the right-angle intersection. The hot air coming out of the connecting pipe 210 is guided by the inclined surface to the airflow direction of the guide hole 201, and the two airflows can be smoothly merged, which greatly reduces the energy loss caused by collision and eddies.

[0035] In some embodiments of the present invention, reference is made to... Figure 3 As shown, m second heat dissipation holes 413 are arranged vertically, and the sum of the cross-sectional areas of the m second heat dissipation holes 413 is greater than or equal to the cross-sectional area of ​​the first heat dissipation hole 412. The cross-sectional area of ​​the first heat dissipation hole 412 is a flat elliptical structure, where m ≥ 1. Specifically, in this embodiment, m is 4. The second heat dissipation holes 413 are the inlets for cold air medium, and the first heat dissipation holes 412 are the outlets for hot air medium. The sum of the cross-sectional areas of the second heat dissipation holes 413 is greater than or equal to the cross-sectional area of ​​the first heat dissipation hole 412, which ensures that the total inlet cross-sectional area is not less than the outlet cross-sectional area. The system provides a sufficient and low-resistance channel for the entry of cold air, which allows the air circulation inside the heat conduction cavity 411 to be smoother and more efficient, thereby maximizing the heat dissipation effect and preventing the impact of blockage of some second heat dissipation holes 413 on the heat dissipation effect of the entire system. In this embodiment, to meet the requirements of lightweight design, the thickness of the heat sink 410 is 2mm to 5mm, and the thickness of the heat sink 410 in this embodiment is 3mm. The flat elliptical first heat dissipation hole 412 can have a relatively large opening area, maximizing the opening area in a limited space. At the same time, the flat elliptical first heat dissipation hole 412 can reduce air resistance. In addition, four second heat dissipation holes 413 are distributed vertically on the heat sink 410 to form a stepped air intake channel, making the temperature distribution of the entire heat conduction cavity 411 more uniform in the longitudinal direction, avoiding the formation of local hot spots, thereby improving heat dissipation efficiency.

[0036] In some embodiments of the present invention, reference is made to... Figure 3 As shown, connecting blocks 420 are provided on both sides of the heat dissipation grille 400. A vent 421 is provided on the connecting block 420 corresponding to the second heat dissipation hole 413, and a sealing sleeve 422 is provided on the vent 421. Specifically, in this embodiment, the heat dissipation grille 400 is provided with three heat dissipation fins 410, and four battery cells 130 are attached to the front and rear sides of the heat dissipation fins 410 respectively. Every two battery cells 130 are symmetrically arranged on the same side of the heat dissipation fins 410. In this embodiment, the heat dissipation grille 400 forms a support frame for the battery cells 130. By providing connecting blocks 420 on both sides of the heat dissipation grille 400, the connecting blocks 420 can simultaneously connect all the heat dissipation fins 410 on the same side. By providing connecting blocks 420, the structural strength of the heat dissipation grille 400 can be improved. Furthermore, in this embodiment, the connecting blocks 420 are provided with vent holes 421 corresponding to the second heat dissipation holes 413. The vent holes 421 are connected to the outer shell 100. The vent holes 421 are provided with sealing sleeves 422. The connecting blocks 420 and the sealing sleeves 422 can prevent air containing water vapor and impurities from directly entering the interior of the outer shell 100. It protects the metal tabs 131 of the battery cell 130, the precision circuits on the first circuit board 310, and other sensitive components from moisture, condensation, corrosion, and dust accumulation, improving the environmental adaptability and long-term reliability of the entire battery pack, thereby significantly extending its service life.

[0037] In some embodiments of the present invention, reference is made to... Figure 3 and Figure 5 As shown, baffles 430 are respectively provided on both sides of the heat sink 410. Specifically, in this embodiment, the baffles 430 serve as limits on both sides of the heat sink 410, facilitating the installation of the battery cell 130. They also improve the structural strength of the heat sink 410. By providing the baffles 430, the energy of impact and vibration can be effectively dispersed and absorbed, providing mechanical protection for the battery cell 130 and improving the durability of this embodiment.

[0038] In some embodiments of the present invention, reference is made to... Figure 7As shown, the surface of the heat sink 410 is provided with a plurality of heat dissipation grooves 415, which are distributed around the heat conduction cavity 411; the heat sink 410 forms a corrugated structure through the heat dissipation grooves 415 on both sides. Specifically, in this embodiment, the contact area between the flat heat sink 410 and the battery cell 130 is fixed. By providing a plurality of heat dissipation grooves 415 around the heat conduction cavity 411 on the surface, the actual surface area of ​​the heat sink 410 in contact with the internal environment is increased. According to the principle of convection heat transfer, the heat dissipation capacity is proportional to the effective heat transfer area. The increase in surface area directly improves the efficiency of heat dissipation of the heat sink 410 to the air; furthermore, the partially corrugated heat sink 410 is less prone to bending or twisting when subjected to the pressure from the battery cells 130 on both sides, as well as the vibration and torsion during the flight of the drone, thereby improving the structural strength of the heat sink 410 under the premise of lightweight design.

[0039] In some embodiments of the present invention, reference is made to... Figure 4 As shown, the heat sink 410 is provided with several hollowed-out grooves 416. Specifically, in this embodiment, the heat dissipation grille 400 is provided with a heat sink 410, and battery cells 130 are respectively attached to both sides of the heat sink 410. A heat conduction cavity 411 is provided in the heat sink 410 corresponding to the center position of the battery cell 130. A first heat dissipation hole 412 is provided at the upper part of the heat conduction cavity 411, and a second heat dissipation hole 413 is provided at the lower part of the heat conduction cavity 411. Several heat dissipation grooves 415 are provided on the surface of the heat sink 410, and the several heat dissipation grooves 415 are distributed around the heat conduction cavity 411. The heat sink 410 has several hollowed-out grooves 416 that avoid the heat conduction cavity 411, the first heat dissipation hole 412, the second heat dissipation hole 413 and the heat dissipation grooves 415, thereby improving the weight of the heat sink 410 while ensuring the structural strength of the heat sink 410.

[0040] In some embodiments of the present invention, reference is made to... Figure 3 and Figure 8As shown, it also includes a heat insulation plate 440, with first heat insulation sheets 441 respectively provided on both sides of the heat insulation plate 440, and a second heat insulation sheet 442 provided on the lower side of the heat insulation plate 440. The first heat insulation sheet 441 is attached to the side of the battery cell 130, and the second heat insulation sheet 442 is attached to the bottom of the battery cell 130. Specifically, in this embodiment, the heat dissipation grille 400 is provided with heat dissipation fins 410, with battery cells 130 respectively attached to both sides of the heat dissipation fins 410. A heat conduction cavity 411 is provided inside the heat dissipation fins 410 at the center position corresponding to the battery cell 130; a first heat dissipation hole 412 is provided at the upper part of the heat conduction cavity 411, and a second heat dissipation hole 413 is provided at the lower part of the heat conduction cavity 411. The heat insulation plate 440 is attached to one side and circumference of the relatively soft pouch cell 130, providing a rigid framework for the cell 130. This effectively resists the expansion and deformation of the cell 130 during charge-discharge cycles or due to aging, maintaining the stability of the entire battery module structure and preventing heat dissipation path failure or internal short circuits caused by deformation. During normal operation, the heat insulation plate 440 is designed to direct the heat generated by the cell 130 to the designated heat sink 410. This directional heat conduction design ensures that heat is efficiently carried away through a preset path, avoiding disorderly heat accumulation inside the cell 130, thereby improving overall heat dissipation efficiency and ensuring the battery operates within its optimal temperature range. In the event of abnormal heating or even thermal runaway in some cells 130, the heat insulation plate 440 establishes a thermal protection barrier between the cells 130, delaying or blocking heat transfer from the abnormal cell 130 to adjacent normal cells 130, effectively preventing the chain reaction of thermal runaway within the module.

[0041] Secondly, referring to Figure 1 and Figure 2As shown, this invention discloses a drone battery module, including a soft-pack lithium battery cell heat dissipation system as a first aspect. Specifically, the drone battery module includes a soft-pack lithium battery cell heat dissipation system, a battery cell 130, a housing 100, and an end cap device 120. A base plate 110 is provided at the lower part of the housing 100, and a buffer pad 111101 is provided on the base plate 110. The battery cell 130 is disposed within the lithium battery cell heat dissipation system. The soft-pack lithium battery cell heat dissipation system includes a ventilation module 200, a power distribution module 300, and a heat dissipation grille 400. A connecting pipe 210 is provided at the lower part of the ventilation module 200, and the power distribution... Module 300 is equipped with a first circuit board 310 and a thermally conductive silicone pad 320. The lower end of the thermally conductive silicone pad 320 is attached to the first circuit board 310, and the upper end of the thermally conductive silicone pad 320 is attached to the ventilation module 200. The lower end of the heat dissipation grille 400 abuts against the buffer pad 111101. The heat dissipation grille 400 is equipped with a heat sink 410. The front and rear sides of the heat sink 410 are respectively attached to the battery cell 130, and the left and right sides of the heat sink 410 abut against the inside of the outer shell 100. Air inlets 101 are respectively provided on both sides of the outer shell 100. The end cover device 120 is equipped with a control button 121, a second circuit board 122, and a power interface 123. The first circuit board 310 is an ASM (Automatic Smart Controller), and the second circuit board 122 is a BMS (Battery Management System). The ASM is responsible for establishing the electrical path from the battery cell 130 to the power interface 123. It directly controls the on / off of the main power supply to the UAV power system through internal high-current switching devices. The core algorithm of the BMS is responsible for calculating the battery's state of charge and health status in real time. BMS integrates data from ASM and its own collected data to provide users with accurate remaining power information and battery life prediction.

[0042] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A heat dissipation system for a soft-pack lithium battery cell, characterized in that, include: A ventilation module (200) is provided with at least one guide hole (201) in the horizontal direction, and convection holes (202) are provided on both sides of the guide hole (201); a connecting pipe (210) is provided at the lower part of the ventilation module (200), and the axis of the connecting pipe (210) is perpendicular to the axis of the guide hole (201); the connecting pipe (210) is connected to the guide hole (201). A power distribution module (300) is provided with a first circuit board (310) and a thermally conductive silicone pad (320). The lower end of the thermally conductive silicone pad (320) is attached to the first circuit board (310), and the upper end of the thermally conductive silicone pad (320) is attached to the ventilation module (200). A heat dissipation grille (400) is provided with at least one heat sink (410). A battery cell (130) is attached to both sides of the heat sink (410). A heat conduction cavity (411) is provided in the heat sink (410) at the center position corresponding to the battery cell (130). A first heat dissipation hole (412) is provided at the upper part of the heat conduction cavity (411), and a second heat dissipation hole (413) is provided at the lower part of the heat conduction cavity (411). The lower end of the connecting pipe (210) passes through the thermally conductive silicone sheet (320) and the first circuit board (310) and connects to the first heat dissipation hole (412).

2. The heat dissipation system for soft-pack lithium battery cells according to claim 1, characterized in that, The longitudinal section of the convection hole (202) is rectangular; the longitudinal section of the guide hole (201) is circular, and guide slopes (203) are provided on the outer edges of both sides of the guide hole (201).

3. The heat dissipation system for soft-pack lithium battery cells according to claim 2, characterized in that, A guide slope (414) is provided at the connection between the connecting pipe (210) and the guide hole (201). The guide slope (414) forms a guide area above the connecting pipe (210). The guide area invades the guide path of the guide hole (201). The guide area is a cone formed by rotating the maximum cross section of the projection of the guide slope (414) in the vertical direction around the axis.

4. The heat dissipation system for soft-pack lithium battery cells according to claim 1, characterized in that, The second heat dissipation hole (413) is provided with m in the vertical direction. The sum of the cross-sectional areas of the m second heat dissipation holes (413) is greater than or equal to the cross-sectional area of ​​the first heat dissipation hole (412). The cross-sectional area of ​​the first heat dissipation hole (412) is a flat elliptical structure, where m≥1.

5. The heat dissipation system for soft-pack lithium battery cells according to claim 4, characterized in that, Connecting blocks (420) are provided on both sides of the heat dissipation grille (400). A vent hole (421) is provided on the connecting block (420) corresponding to the second heat dissipation hole (413). A sealing sleeve (422) is provided on the vent hole (421).

6. The heat dissipation system for a soft-pack lithium battery cell according to claim 5, characterized in that, The heat sink (410) is provided with baffles (430) on both sides.

7. The heat dissipation system for a soft-pack lithium battery cell according to claim 1, characterized in that, The surface of the heat sink (410) is provided with a plurality of heat dissipation grooves (415), and the plurality of heat dissipation grooves (415) are distributed on the periphery of the heat conduction cavity (411); the heat sink (410) forms a corrugated structure through the heat dissipation grooves (415) on both sides.

8. The heat dissipation system for a soft-pack lithium battery cell according to claim 7, characterized in that, The heat sink (410) is provided with several hollowed-out slots (416).

9. The heat dissipation system for a soft-pack lithium battery cell according to claim 1, characterized in that, It also includes a heat insulation plate (440), on both sides of the heat insulation plate (440) are respectively provided a first heat insulation sheet (441), and on the lower side of the heat insulation plate (440) is a second heat insulation sheet (442). The first heat insulation sheet (441) is attached to the side of the battery cell (130), and the second heat insulation sheet (442) is attached to the bottom of the battery cell (130).

10. A drone battery module, characterized in that, The invention includes a heat dissipation system for a soft-pack lithium battery cell as described in any one of claims 1 to 9.

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