Heat dissipation structure of soft package battery pack for storing energy or power and battery module

Abstract

The utility model discloses a heat dissipation structure of a soft package battery pack for storing energy or power and a battery module. The heat dissipation structure is provided with a central axial flow air duct, an even number of groups of metal heat dissipation fin assemblies and heat dissipation fin assemblies, the metal cooling fin assembly is distributed along the central axial flow air channel and composed of metal cooling fins, and the large faces of the metal cooling fins are perpendicularly arranged relative to the first direction. The heat dissipation fin assembly is arranged on the side close to the central axial flow air channel, the large face of the heat dissipation fin assembly is perpendicular to the large faces of the metal heat dissipation fins, and the central axial flow air channel is formed by limiting of the heat dissipation fin assembly. The heat dissipation fin assembly and the metal heat dissipation fin assembly are connected through a heat conduction copper pipe assembly. And a fan is arranged on the central axial flow air duct. Compared with the prior art, the structure is simple, the contact area of the heat dissipation medium and the battery pack is ensured, the heat dissipation structure is tightly connected, the space utilization rate is improved, and the problems of insufficient heat dissipation safety redundancy, low heat conduction efficiency and overweight and overlimit structure size are solved.

Description

Technical Field

[0001] This utility model relates to the field of battery pack heat dissipation technology, specifically to a heat dissipation structure and battery module for a soft-pack battery pack used for energy storage or power. Background Technology

[0002] Pouch battery packs are the power source for many new energy devices due to their advantages such as small size, high energy density, high safety, and flexible design, leading to their widespread application. Although pouch batteries are lightweight, the overall weight of the assembled battery pack is relatively large and its structure is complex due to structural support and heat dissipation design requirements. During operation, pouch battery packs generate significant heat, which accumulates more easily due to their high energy density and compact structure, significantly increasing the difficulty of heat dissipation and posing a greater challenge to thermal management. Therefore, the design of a thermal management system for pouch battery packs is crucial.

[0003] Currently, there are two common heat dissipation methods for pouch battery packs used in energy storage or power applications: natural heat dissipation, which involves filling the spaces between the batteries in the pouch battery pack with thermal grease and mounting the modules tightly to a metal casing, conducting heat to the casing and then dissipating it to the outside air through natural convection and thermal radiation; and liquid cooling, which involves covering the battery surface with a heat dissipation structure containing flowing liquid channels, using the heat dissipation liquid flowing in the channels to carry away the heat from the battery.

[0004] However, in practical applications, battery systems used in small and medium-sized drones, special electric vehicles, and deep-sea probes that require multiple high-rate discharges suffer from poor heat dissipation under various conditions, such as acceleration in racing drones and heavy-load launches in agricultural drones. Natural cooling is ineffective, easily leading to localized overheating and increasing the risk of thermal runaway, which is not conducive to prolonged high-rate charging and discharging. Liquid cooling consumes internal battery energy, is too expensive, and suffers from issues such as exceeding structural size and weight limits, complex piping structures, and difficulties in adapting to small-scale energy storage or power pouch battery packs. Therefore, it is necessary to research a heat dissipation structure and battery module for energy storage or power pouch battery packs that is simple in structure, low in cost, provides uniform heat dissipation, and extends battery life. Utility Model Content

[0005] The purpose of this invention is to address the problems of complex structure, low heat dissipation efficiency, and high heat dissipation cost in existing pouch battery packs for energy storage or power applications. Currently, pouch battery packs commonly use two heat dissipation methods: natural heat dissipation and liquid cooling. However, natural heat dissipation suffers from insufficient safety redundancy and low thermal conductivity, while liquid cooling is too expensive and exceeds structural size and weight limits. To address these issues, we have improved the thermal conductivity efficiency through a close-fitting and large-area coverage method, ensuring the heat dissipation structure does not exceed 6% of the battery pack's internal space. This solves the problems of insufficient safety redundancy, low thermal conductivity, complex structure, and high cost. We have researched a heat dissipation structure and battery module for pouch battery packs for energy storage or power applications that is simple in structure, low in cost, provides uniform heat dissipation, and extends battery life.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model provides a heat dissipation structure for a soft-pack battery pack for energy storage or power, which has a central axial airflow duct arranged along a first direction, and also includes an even array of metal heat sink assemblies and heat sink fin assemblies.

[0008] The metal heat sink assembly is distributed along the central axial airflow duct. Each group of the metal heat sink assembly consists of several metal heat sinks. The metal heat sink has a large surface, a long side surface, and a short side surface. The large surface, long side surface, and short side surface of the metal heat sink are in contact with the three different planes of the battery cell. In each group of the metal heat sink assembly, the large surface of the metal heat sink is set perpendicular to the first direction.

[0009] The heat dissipation fin assembly is located on one side near the central axial airflow duct, and the large surface of the heat dissipation fin assembly is perpendicular to the large surface of the metal heat sink. The central axial airflow duct is formed by the heat dissipation fin assemblies arranged opposite to each other.

[0010] The heat dissipation fin assembly and the metal heat dissipation fin assembly are connected by a heat-conducting copper pipe assembly.

[0011] The central axial flow duct is also equipped with a fan to provide flow power along the first direction for the central axial flow duct.

[0012] The above-mentioned design of this utility model features compact space, high heat dissipation efficiency, and lightweight heat dissipation structure, solving problems such as insufficient safety redundancy, low heat conduction efficiency, complex structure, and high cost. The symmetrical heat dissipation structure layout achieves balanced heat dissipation distribution and airflow allocation, improving space utilization and solving the problem of uneven local heat dissipation. The metal heat sink assembly is tightly bonded to three sides of the battery cell, employing a multi-contact surface design to significantly improve heat conduction efficiency by increasing the heat dissipation surface area. The compact structure optimizes space utilization. The heat-conducting copper pipe assembly concentrates heat onto the heat dissipation fin assembly, achieving efficient heat accumulation. The fan and central axial airflow duct are limited by the relatively arranged heat dissipation fin assembly, significantly reducing space occupation and improving space utilization.

[0013] The metal heat sink assembly is symmetrically distributed along the central axial airflow duct.

[0014] As a further embodiment, the even-numbered metal heat sink assembly is preferably in the form of 2, 4, or 6 groups, with 2 groups being preferred; the even-numbered metal heat sink assemblies of 4 or more groups are symmetrically distributed along the extension direction of the central axial airflow duct in pairs.

[0015] As a further option, the metal heat sink is made of aluminum, aluminum alloy, copper, or copper alloy, preferably aluminum. Metal heat sinks made of aluminum are lightweight, corrosion-resistant, and easy to process, meeting the requirements for lightweight and low-cost small pouch battery packs.

[0016] As a further embodiment, the large surface area of ​​the metal heat sink has the characteristic of covering 50%-90% of the large surface area of ​​the battery cell, preferably 85%; the thickness of the metal heat sink is 0.5-1.2mm, preferably 1mm; because aluminum has a high specific heat capacity, it can store heat for a short time, and the large surface area design can accelerate heat conduction.

[0017] As a further embodiment, the thermally conductive copper pipe assembly includes at least one set of first thermally conductive copper pipes and second thermally conductive copper pipes. The first thermally conductive copper pipes and the second thermally conductive copper pipes are perpendicular to each other and respectively contact the long side and the short side of the metal heat sink to form an L-shaped right angle.

[0018] As a further embodiment, the lengths of the first and second thermally conductive copper pipes are 50%-100% of the lengths of the long and short sides of the metal heat sink, respectively, preferably 80%. To ensure the high efficiency of the heat conduction path, the thermally conductive copper pipe assembly has at least 50% effective contact with the long and short sides of the metal heat sink, thereby achieving efficient heat transfer from the heat source to the heat sink and improving the heat conduction efficiency.

[0019] As a further embodiment, the heat-conducting copper pipe assembly can be a circular copper pipe, a square copper pipe, or a flat copper pipe; preferably, it is a hollow flat copper pipe. The thickness of the heat-conducting copper pipe assembly is 3-7mm, preferably 6mm; the wall thickness of the heat-conducting copper pipe assembly is 0.5-1mm, preferably 0.8mm. The hollow flat copper pipe structure provides space for vacuum coolant, while the flat structure increases the contact area between the heat-conducting copper pipe assembly and the long and short sides of the metal heat sink, achieving efficient heat transfer within a compact space.

[0020] As a further embodiment, the hollow internal space of the heat-conducting copper tube assembly contains a vacuum coolant, which can be selected from, for example, an aqueous solution of ethylene glycol, an aqueous solution of propylene glycol, mineral oil, a corrosion inhibitor, or a phase change material. The vacuum coolant achieves efficient heat absorption and transfer through an evaporation-condensation cycle. Simultaneously, the vacuum environment reduces the thermal resistance of gas convection, thereby improving heat conduction efficiency.

[0021] As a further embodiment, the heat dissipation fin assembly is composed of heat dissipation fins, each of which has a wide upper surface and a narrow lower surface. The narrowing structure at the bottom is formed by the inward contraction of at least one side of the heat dissipation fin, creating a notch space on at least one side of the heat dissipation fin assembly. This notch space provides installation space for the fan. The compact design of this structure ensures a large heat dissipation area for the heat dissipation fin assembly while retaining installation space for the fan. The close fit design has the advantages of saving space and reducing costs.

[0022] As a further embodiment, the heat dissipation fin assembly is preferably composed of several T-shaped heat dissipation fins. The lower part of each T-shaped heat dissipation fin has a narrowing structure on both sides, so that two fans can be installed on the central axial flow air duct between a group of metal heat dissipation fin assemblies, thereby improving space utilization, axial flow dynamics, and heat dissipation efficiency.

[0023] As a further embodiment, the heat dissipation fin assembly consists of 10-20 T-shaped heat dissipation fins, preferably 15 fins.

[0024] As a further embodiment, the heat dissipation fin assembly is a T-shaped heat dissipation fin with a thickness of 0.5-3mm, preferably 1.5mm.

[0025] As a further embodiment, a small pouch battery assembly for energy storage or power also includes a pack housing and a pack cover; the pack housing surrounds the outer periphery and bottom of the metal heat sink assembly, including four pack housing sides and one pack housing bottom; the pack cover can be fastened to the top of the pack housing.

[0026] As a further solution, in the heat dissipation structure of the pouch battery pack for energy storage or power, the gaps between the structural components are filled with lightweight thermally conductive material. As specific examples, the outer gaps of the pack housing and a small pouch battery heat dissipation structure consisting of a central axial airflow duct, a metal heat sink assembly, and a heat sink fin assembly are filled with one of the following: thermally conductive structural adhesive, phase change material, ceramic fiber felt, and lightweight polyurethane foam, preferably polyurethane foam; this provides lightweight filling, shock absorption, and low cost. As an optimized option, the gaps between the metal heat sink and the battery cell are filled with thermally conductive silicone grease, resulting in better thermal conductivity.

[0027] In this invention, the connection method between the heat sink assembly and the heat-conducting copper pipe assembly is not limited, and any method that can achieve a reliable connection between the two can be adopted; as an optional optimization, the metal heat sink assembly and the heat-conducting copper pipe assembly are connected by welding, for example, including resistance welding connection, ultrasonic welding connection, reflow soldering connection, etc., with reflow soldering connection being preferred.

[0028] This utility model also provides a small soft-pack battery assembly for energy storage or power, including the above-mentioned small soft-pack battery heat dissipation structure for energy storage or power, and also includes a set of battery cells that are matched and contacted with the metal heat sink.

[0029] The features and beneficial effects of this utility model are as follows:

[0030] (1) This utility model provides a heat dissipation structure for a soft-pack battery pack for energy storage or power. It adopts a reasonable spatial layout, which realizes the characteristics of compact space and high space utilization. On the one hand, by adopting a symmetrical structure and modular design, the division of each area is unified, reducing the waste of irregular corners and reducing redundant space. On the other hand, the metal heat sink is closely attached to each cell, and the first heat-conducting copper pipe and the second heat-conducting copper pipe are closely attached to the long side and the short side of the metal heat sink, respectively. Furthermore, the narrow structure formed by the heat dissipation fin assembly and the close attachment of the fan reduce space occupation and improve space utilization.

[0031] (2) This utility model provides a heat dissipation structure for a soft-pack battery pack for energy storage or power, which adopts a reasonable heat transfer design concept to achieve high heat transfer efficiency. Firstly, a metal heat sink adopts a three-sided covering configuration to achieve three-dimensional contact with the battery cell, and the compact topology achieves the maximum heat exchange surface area under the same area; secondly, the first heat-conducting copper pipe arranged along the long side of the metal heat sink and the second heat-conducting copper pipe arranged along the short side of the metal heat sink form an orthogonal layout, constructing a multi-dimensional heat conduction channel, guiding heat to diffuse along the heat-conducting copper pipe assembly to the low-temperature region, thereby improving heat transfer efficiency; thirdly, the metal heat sink fin assembly simultaneously contacts the first and second heat-conducting copper pipes, and the temperature gradient of the heat sink fin assembly itself automatically forms a directional heat migration from the contact area of ​​the heat sink copper pipe assembly to the far end of the heat sink fin assembly, thereby achieving high-efficiency heat accumulation and high-efficiency heat conduction efficiency; fourthly, the fan is located in the central axial flow channel in the first direction, and at the same time, it is closely attached to the T-shaped heat sink fin notch of the heat sink fin assembly to form high-efficiency heat dissipation. The above structures work together to achieve a heat dissipation path from the battery cell to the metal heat sink to the thermally conductive copper pipe assembly to the heat dissipation fin assembly. At the same time, in conjunction with the fan set in the first direction, heat is transferred to the outside of the soft-pack battery pack heat dissipation structure, achieving high heat transfer efficiency.

[0032] (3) Furthermore, the heat transfer efficiency is improved by optimizing the structural features of each component and the contact area between them. As a preferred example, the heat-conducting copper pipe assembly is a flat copper pipe, which increases the contact area between the heat-conducting copper pipe assembly and the side of the metal heat sink; the metal heat sink covers 85% of the large surface area of ​​the battery cell, and the heat-conducting copper pipe assembly covers 80% of the side of the metal heat sink. The optimized structure and the optimized contact coverage area further improve the contact ratio and heat transfer efficiency, ensuring the reliability of heat transfer.

[0033] (4) Furthermore, lightweight aluminum is used as the material for the metal heat sink assembly and the heat sink fin assembly. At the same time, the thickness of the heat sink fins is optimized to reduce the weight of the heat dissipation structure of the small soft-pack battery pack and reduce the energy consumption of the battery due to the weight. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the soft-pack battery module of this utility model.

[0036] Figure 2This is an exploded view of the soft-pack battery module and its internal heat dissipation structure of this utility model.

[0037] Figure 3 This is a schematic diagram of the internal heat dissipation structure of the soft-pack battery module of this utility model.

[0038] Figure 4 This is a schematic diagram of the single-sided heat dissipation structure inside the soft-pack battery module of this utility model.

[0039] Figure 5 This is a schematic diagram of a single heat dissipation unit of this utility model.

[0040] Figure 6 This is a schematic diagram of heat transfer in the soft-pack battery module of this utility model.

[0041] Explanation of the reference numerals in the figure:

[0042] 100. Heat sink assembly; 200. Copper heat pipe assembly; 300. Metal heat sink assembly; 400. Central axial airflow duct; 500. Battery assembly; 600. Pack cover; 700. Pack enclosure;

[0043] 110. Heat sink fins; 210. First heat pipe; 220. Second heat pipe; 310. Metal heat sink; 410. Fan; 510. Battery cell;

[0044] 111. Narrowing structure;

[0045] 311. Large surface of the metal heat sink; 312. Long side surface of the metal heat sink; 313. Short side surface of the metal heat sink;

[0046] 511. Large side of the battery cell; 512. Long side of the battery cell; 513. Short side of the battery cell;

[0047] 711. Side of the pack; 712. Bottom of the pack Detailed Implementation

[0048] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below, along with embodiments of this utility model, but this does not limit the scope of this utility model.

[0049] For ease of understanding, the following are defined: Figure 4 The three mutually perpendicular spatial orientations are shown. The X-axis is perpendicular to the large surface 311 of the metal heat sink; the Y-axis is parallel to the long side surface 312 of the metal heat sink; and the Z-axis is parallel to the short side surface 313 of the metal heat sink.

[0050] The first direction described in this utility model is as follows: Figure 4The arrow shown is parallel to the X-axis and located on the line connecting the centers of the two fans 410, pointing in that direction.

[0051] As a specific example of the implementation of this utility model, detailed examples are provided below:

[0052] This utility model relates to a heat dissipation structure for a soft-pack battery pack used for energy storage or power. It features a central axial flow duct 400 arranged along a first direction, and further includes evenly spaced metal heat sink assemblies 300 and heat sink fin assemblies 100. Figure 1-4 The example shown includes an overall structure comprising an even array of metal heat sink assemblies 300 composed of metal heat sinks 310, a plurality of heat-conducting copper pipe assemblies 200 composed of a first heat-conducting copper pipe 210 and a second heat-conducting copper pipe 220, and a heat dissipation fin assembly 100. It also includes a plurality of fans 410, a pack cover 600, a pack housing 700, and a battery assembly 500.

[0053] The internal heat dissipation structure, as one embodiment, is as follows: Figure 3-4 As shown, the device has a central axial flow duct 400 arranged along a first direction. The internal heat dissipation structure is divided into two symmetrical parts. Each part consists of 10 battery cells 510, 10 metal heat sinks 310, 10 first heat-conducting copper pipes 210, 10 second heat-conducting copper pipes 220, and a heat dissipation fin assembly 100. The heat dissipation fin assembly 100 and the metal heat sink assembly 300 are connected by a heat-conducting copper pipe assembly 200. The metal heat sink assembly 300 and the heat-conducting copper pipe assembly 200 of the two parts concentrate the heat of the battery cells 510 to the heat dissipation fin assembly 100. A fan 410 is also provided on the central axial flow duct 400 to provide the central axial flow duct 400 with the flow power along the first direction. The fan 410 on the central axial flow duct 400 then transfers the heat to the outside of the soft-pack battery pack heat dissipation structure, achieving high heat transfer efficiency.

[0054] The metal heat sink assembly 300 is symmetrically distributed along the central axial airflow duct 400. Each group of the metal heat sink assembly 300 is composed of a plurality of metal heat sinks 310. The metal heat sink 310 has a large metal heat sink surface 311, a long side surface 312 and a short side surface 313 for contacting the battery cell 510 in different directions. In each group of the metal heat sink assembly 300, the large metal heat sink surface 311 is arranged perpendicularly to the first direction.

[0055] The metal heat sink assembly 300 is in even-numbered groups, 4 groups, or 6 groups; the even-numbered metal heat sink assembly 300 with 4 or more groups consists of multiple pairs of metal heat sinks 310 symmetrically distributed along the central axial flow duct 400, such as... Figure 3-4 As shown, two groups are preferred.

[0056] The metal heat sink 310, such as Figure 5 As shown, the metal heat sink 310 is matched with the battery cell 510. The large surface 311 of the metal heat sink is in close contact with the large surface 511 of the battery cell, the long side 312 of the metal heat sink is in close contact with the long side 512 of the battery cell, and the short side 313 of the metal heat sink is in close contact with the short side 513 of the battery cell. In each group of metal heat sink assemblies 300, the large surface 311 of the metal heat sink is set perpendicular to the first direction. The metal heat sinks 310 are configured in a 1:1 ratio with the number of battery cells 510 to ensure comprehensive and multi-directional contact, thereby ensuring that the heat of each battery cell 510 can be fully conducted during charging and discharging. The metal heat sink 310 adopts a three-sided covering configuration to achieve three-dimensional contact with the battery cell 510. The compact topology structure achieves the maximum heat exchange surface area under the same area.

[0057] As some embodiments, the metal heat sink 310 is made of aluminum, aluminum alloy, copper, copper alloy, magnesium, magnesium alloy, etc., preferably aluminum. Using aluminum as the metal heat sink 310 has the characteristics of being lightweight, corrosion resistant, and easy to process, which meets the needs of lightweight and low cost of small soft-pack battery packs.

[0058] As some embodiments, the area of ​​the large surface 311 of the metal heat sink has the characteristic of covering 50%-90% of the area of ​​the large surface 511 of the battery cell. Because aluminum has a high specific heat capacity, it can store heat for a short time. Combined with the design of large surface area bonding, it can accelerate heat conduction.

[0059] As some embodiments, the thickness of the metal heat sink 310 is 0.5-1.2 mm.

[0060] As some embodiments, the thermally conductive copper pipe assembly 200 includes at least one set of first thermally conductive copper pipes 210 and one set of second thermally conductive copper pipes 220. The first thermally conductive copper pipes 210 and the second thermally conductive copper pipes 220 are perpendicular to each other and respectively contact the long side 312 and the short side 313 of the metal heat sink to form an L-shaped right angle.

[0061] In some embodiments, the lengths of the first heat-conducting copper pipe 210 and the second heat-conducting copper pipe 220 are 50%-100% of the side lengths of the long side 312 and the short side 313 of the metal heat sink 310, respectively. To ensure the high efficiency of the heat conduction path, the heat-conducting copper pipe assembly 200 has at least 50% effective contact with the long side 312 and the short side 313 of the metal heat sink, thereby realizing the efficient transfer of heat energy from the heat source to the heat sink and improving the heat conduction efficiency.

[0062] The heat-conducting copper pipe assembly 200, such as Figure 5As shown, the vacuum coolant inside the thermally conductive copper pipe assembly 200 forms convection when heated, and the heat circulates from the high-temperature region to the low-temperature region. The first thermally conductive copper pipe 210, the second thermally conductive copper pipe 220, the metal heat sink 310 and the heat sink fin assembly 100 are matched. The first thermally conductive copper pipe 210 is in close contact with the outer side of the long side 312 of the metal heat sink, and the second thermally conductive copper pipe 220 is in close contact with the outer side of the short side 313 of the metal heat sink. The first thermally conductive copper pipe 210 and the second thermally conductive copper pipe 220 are both embedded in the heat dissipation fin assembly 100. After being heated, the area of ​​the thermally conductive copper pipe assembly 200 that contacts the metal heat sink 310 is a high-temperature area, while the area that contacts the heat sink fin assembly 100 is a low-temperature area. The coolant inside the thermally conductive copper pipe assembly 200 forms convection due to the temperature difference, ensuring that the heat from the charging and discharging of the battery assembly 500 can be sequentially conducted to the metal heat sink 310 and then fully conducted to the heat dissipation fin assembly 100 through the first thermally conductive copper pipe 210 and the second thermally conductive copper pipe 220. This structure enhances the heat dissipation intensity.

[0063] As some embodiments, the heat-conducting copper pipe assembly 200 is a hollow circular copper pipe, a square copper pipe, a flat copper pipe, etc., with a flat copper pipe being the best. The flat structure increases the contact area between the copper pipe and the metal heat sink 310, realizing efficient heat flow transfer in a compact space.

[0064] As some embodiments, the thickness of the first heat-conducting copper pipe 210 and the second heat-conducting copper pipe 220 is 3-7 mm; the wall thickness of the first heat-conducting copper pipe 210 and the second heat-conducting copper pipe 220 is 0.5-1 mm.

[0065] In some embodiments, the hollow internal space of the heat-conducting copper tube assembly 200 contains a vacuum coolant, which includes one of the following: an aqueous solution of ethylene glycol, an aqueous solution of propylene glycol, mineral oil, a corrosion inhibitor, and a phase change material. The vacuum coolant achieves efficient heat absorption and transfer through an evaporation-condensation cycle. At the same time, the vacuum environment reduces the thermal resistance of gas convection and improves heat conduction efficiency.

[0066] In some embodiments, the heat dissipation fin assembly 100 is composed of heat dissipation fins 110. The large surface of each heat dissipation fin 110 has a structure that is wider at the top and narrower at the bottom. The lower narrowing structure 111 is formed by the inward contraction of at least one side of the heat dissipation fin 110, which constitutes a notch space on at least one side of the heat dissipation fin assembly 100. This notch space provides installation space for the fan 410. The compact design of this structure ensures a large heat dissipation area of ​​the heat dissipation fin assembly 100 while retaining installation space for the fan 410. The close fit design has the advantages of saving space and reducing costs.

[0067] As some embodiments, the heat dissipation fin assembly 100 is preferably a plurality of T-shaped heat dissipation fins 110, each T-shaped heat dissipation fin 110 having a narrowing structure 111 on both sides of the lower part, so that two fans 410 can be installed on the central axial flow air duct 400 between a group of metal heat dissipation fin assemblies 300, thereby improving space utilization, axial flow power and heat dissipation efficiency.

[0068] As some embodiments, the heat sink assembly 100 consists of 10-20 heat sink fins 110.

[0069] As some embodiments, the thickness of each T-shaped heat sink fin 110 is 0.5-3mm.

[0070] The heat dissipation fin assembly 100 is disposed on one side near the central axial airflow duct, and the large surface of the heat dissipation fin assembly 100 is perpendicular to the large surface 311 of the metal heat sink. The central axial airflow duct 400 is formed by the heat dissipation fin assembly 100 disposed opposite to it.

[0071] The central axial flow duct 400 is also equipped with a fan 410, which is used to provide the central axial flow duct 400 with flow power in the first direction.

[0072] The number of fans 410 is one or more, such as Figure 4 Two fans 410 are arranged in the same direction, one is responsible for drawing in air and the other is responsible for blowing out air. The fans 410 are matched with the notch of the heat sink assembly 100 to ensure that the air duct formed is close to the surface of the heat sink assembly 100. This saves space and accelerates the dissipation of heat transferred to the heat sink assembly 100 during the charging and discharging of the battery assembly 500.

[0073] The metal heat sink 310 is connected to the first heat-conducting copper pipe 210 and the second heat-conducting copper pipe 220 by welding, including resistance welding, ultrasonic welding, and reflow soldering, with reflow soldering being the preferred method. The heat sink assembly 100 is also preferably connected to the first heat-conducting copper pipe 210 and the second heat-conducting copper pipe 220 using reflow soldering, which ensures efficient and reliable heat transfer at each step.

[0074] like Figure 1-4 A small pouch battery pack assembly for energy storage or power also includes a pack cover 600 and a pack housing 700; the five sides of the pack housing 700 surround the heat dissipation structure of the small pouch battery, which is composed of a central axial airflow duct 400, a metal heat sink assembly 300 and a heat sink fin assembly 100, and include four pack housing side surfaces 711 and one pack housing bottom surface 712; the pack cover 600 can be fastened to the top of the pack housing 700.

[0075] As a further embodiment, the outer gap between the pack housing and the small soft-pack battery heat dissipation structure composed of the central axial airflow duct 400, the metal heat sink assembly 300, and the heat dissipation fin assembly 100 is filled with one of the following: thermally conductive structural adhesive, phase change material, ceramic fiber felt, and lightweight polyurethane foam, preferably polyurethane foam; this provides lightweight filling, shock absorption, and low cost. In some embodiments, the gap between the metal heat sink 310 and the battery cell 510 is also filled with a thermally conductive medium, preferably silicone grease.

[0076] This invention achieves high space utilization due to its compact structure, with the heat dissipation structure occupying no more than 6% of the internal space, thus solving the problem of insufficient safety redundancy. As shown in Table 1, as an example, the area of ​​the large surface 311 of the metal heat sink covers 85% of the area of ​​the large surface 511 of the battery cell. The thickness of the metal heat sink 310 is 1 mm. The lengths of the first heat-conducting copper pipe 210 and the second heat-conducting copper pipe 220 are 80% of the side lengths of the long side 312 and the short side 313 of the metal heat sink 310, respectively. The thicknesses of the first heat-conducting copper pipe 210 and the second heat-conducting copper pipe 220 are 6 mm, and the wall thicknesses of the first heat-conducting copper pipe 210 and the second heat-conducting copper pipe 220 are 0.8 mm. The heat dissipation fin group consists of 15 T-shaped heat dissipation fins 110, each T-shaped heat dissipation fin 110 being 1.5 mm thick. Taking 20 battery cells 510 as an example, the length, width, and height of the battery cell 510 are 172 mm, 10.4 mm, and 74 mm, respectively, and the volume of the battery cell 510 is 2647424 mm². 3 The internal volume of the 510 battery cell is 280 x 2823 mm. 3 Therefore, the volume of the heat dissipation structure is 155399 mm². 3 The heat dissipation structure accounts for only 5.5443% of the total space, solving the problem of high space requirements for heat dissipation structures. As shown in Table 2, this invention uses a metal heat sink assembly 300 in conjunction with a thermally conductive copper pipe assembly 200 to transfer heat from the large surface and sides of the battery assembly 500 during operation. The thermal conductivity of the metal heat sink assembly 300 is as high as 167-180 W / (m·K), and the thermal conductivity of the thermally conductive copper pipe assembly 200 is as high as 100 W / (m·K). When used together, the thermal conductivity is much higher than that of air (0.024 W / (m·K)) or aerogel (0.013 W / (m·K), and also higher than that of conventional thermal grease (14.2 W / (m·K), thereby improving the heat dissipation efficiency of the soft-pack battery.

[0077] Table 1. Heat dissipation structure of pouch battery and its proportion in total space.

[0078]

[0079] Table 2 Comparison of different heat dissipation materials for pouch batteries

[0080] Heat dissipation material Thermal conductivity / W / (m·K) Metal heat sink assembly 300 167-180 200 thermally conductive copper pipe assembly 100 Air 0.024 aerogel 0.013 Thermal grease 14.2

[0081] The working principle of this utility model, "a heat dissipation structure for a soft-pack battery pack," is as follows: Figure 6 Cool air from outside the pack enclosure 700 is drawn into the enclosure by fan 410. The cool air is then evenly blown across the surface of the heat dissipation fin assembly 100 until it is blown out of the enclosure by another fan 410. Simultaneously, during charging and discharging, the heat generated by the battery cell 510 is first transferred to the metal heat sink 310 in close contact with the battery cell 510. The metal heat sink 310 then conducts the heat along the side to the first thermally conductive copper pipe 210 and the second thermally conductive copper pipe 220. The first and second thermally conductive copper pipes 210, relying on their internal phase change materials, then efficiently conduct the heat to the heat dissipation fin assembly 100. The heated heat dissipation fin assembly 100 then gradually dissipates the heat along the surface airflow channels. Figure 4 The direction of the arrow indicates that the temperature of the 510 cell is maintained at a safe level during charging and discharging, thus ensuring the thermal safety of the battery pack.

[0082] In summary, this invention achieves sufficient heat dissipation for the pouch battery through a compact heat dissipation structure and efficient heat transfer method. On the one hand, the three-dimensional heat dissipation structure conducts heat through the metal heat sink assembly 300 to the heat-conducting copper pipe assembly 200, and then to the heat dissipation fin assembly 100. Simultaneously, the strategy of incorporating a fan 410 within the symmetrical central axial flow channel 400 achieves efficient heat transfer, ensuring the overall operating temperature of the pouch battery remains within a suitable range. On the other hand, the simple structure and tight fit between components reduce the proportion of the heat dissipation structure within the entire battery pack, thereby reducing the overall weight of the battery pack and extending its overall lifespan. It solves problems such as insufficient safety redundancy, low heat conduction efficiency, complex structure, and high cost. This invention is particularly suitable for the thermal management system design of pouch power battery packs for small and medium-sized UAVs, special electric vehicles, deep-sea probes, and other applications requiring multiple high-rate discharges, especially under various operating conditions such as acceleration in racing drones and heavy-load launches in agricultural drones.

[0083] It should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery pack heat dissipation structure, characterized in that, It has a central axial airflow duct (400) arranged in a first direction, and also includes an even array of metal heat sink assemblies (300) and heat sink fin assemblies (100). The metal heat sink assembly (300) is distributed along the central axial flow duct (400). Each metal heat sink assembly (300) consists of several metal heat sinks (310). The metal heat sink (310) has a large surface (311), a long side surface (312), and a short side surface (313). The large surface (311), the long side surface (312), and the short side surface (313) of the metal heat sink are in contact with the three different planes of the battery cell (510). In each metal heat sink assembly (300), the large surface (311) of the metal heat sink is perpendicular to the first direction. The heat dissipation fin assembly (100) is located on one side near the central axial airflow duct (400). The large surface of the heat dissipation fin assembly (100) is perpendicular to the large surface (311) of the metal heat sink. The central axial airflow duct (400) is formed by the heat dissipation fin assembly (100) arranged opposite to each other. The heat dissipation fin assembly (100) and the metal heat dissipation fin assembly (300) are connected by a thermally conductive copper pipe assembly (200); The central axial flow duct (400) is also equipped with a fan (410) for providing flow power to the central axial flow duct (400) in the first direction.

2. The battery pack heat dissipation structure according to claim 1, characterized in that, The metal heat sink assembly (300) is symmetrically distributed along the central axial flow duct (400).

3. The battery pack heat dissipation structure according to claim 1, characterized in that, The metal heat sink (310) is made of aluminum, aluminum alloy, copper, or copper alloy.

4. The battery pack heat dissipation structure according to claim 1, characterized in that, The metal heat sink (310) is made of aluminum.

5. A battery pack heat dissipation structure according to claim 1, characterized in that, The area of ​​the large surface (311) of the metal heat sink has the characteristic of covering 50%-90% of the area of ​​the large surface (511) of the battery cell.

6. The battery pack heat dissipation structure according to claim 1, characterized in that, The area of ​​the large surface (311) of the metal heat sink has the characteristic of covering 85% of the area of ​​the large surface (511) of the battery cell.

7. A battery pack heat dissipation structure according to claim 1, characterized in that, The thickness of the metal heat sink (310) is 0.5-1.2 mm.

8. A battery pack heat dissipation structure according to claim 1, characterized in that, The thickness of the metal heat sink (310) is 1 mm.

9. A battery pack heat dissipation structure according to claim 1, characterized in that, The thermally conductive copper pipe assembly (200) includes at least one set of first thermally conductive copper pipe (210) and second thermally conductive copper pipe (220). The first thermally conductive copper pipe (210) and the second thermally conductive copper pipe (220) are perpendicular to each other and are in contact with the long side (312) and the short side (313) of the metal heat sink, respectively, forming an L-shaped right angle.

10. A battery pack heat dissipation structure according to claim 9, characterized in that, The lengths of the first heat-conducting copper tube (210) and the second heat-conducting copper tube (220) are 50%-100% of the side lengths of the long side (312) and the short side (313) of the metal heat sink, respectively.

11. A battery pack heat dissipation structure according to claim 8, characterized in that, The lengths of the first heat-conducting copper tube (210) and the second heat-conducting copper tube (220) are 80% of the side lengths of the long side (312) and the short side (313) of the metal heat sink, respectively.

12. A battery pack heat dissipation structure according to claim 1, characterized in that, The heat-conducting copper tube assembly (200) can be a round copper tube, a square copper tube, or a flat copper tube.

13. A battery pack heat dissipation structure according to claim 1, characterized in that, The heat-conducting copper tube assembly (200) is a hollow, flat copper tube.

14. A battery pack heat dissipation structure according to claim 1, characterized in that, The thickness of the thermally conductive copper tube assembly (200) is 3-7 mm.

15. A battery pack heat dissipation structure according to claim 1, characterized in that, The thickness of the thermally conductive copper tube assembly (200) is 6 mm.

16. A battery pack heat dissipation structure according to claim 1, characterized in that, The wall thickness of the thermally conductive copper tube assembly (200) is 0.5-1 mm.

17. A battery pack heat dissipation structure according to claim 1, characterized in that, The wall thickness of the thermally conductive copper tube assembly (200) is 0.8 mm.

18. A battery pack heat dissipation structure according to claim 1, characterized in that, The hollow internal space of the heat-conducting copper tube assembly (200) contains a vacuum coolant, which includes one of the following: ethylene glycol aqueous solution, propylene glycol aqueous solution, mineral oil, corrosion inhibitor, and phase change material.

19. A battery pack heat dissipation structure according to claim 1, characterized in that, The heat dissipation fin assembly (100) is composed of heat dissipation fins (110). The large surface of each heat dissipation fin (110) is a structure that is wider at the top and narrower at the bottom. The narrowing structure (111) at the bottom is formed by the inward contraction of at least one side of the heat dissipation fin (110), which constitutes a notch space on at least one side of the heat dissipation fin assembly (100). This notch space provides installation space for the fan (410).

20. A battery pack heat dissipation structure according to claim 1, characterized in that, The heat dissipation fin assembly (100) consists of several T-shaped heat dissipation fins (110). Each T-shaped heat dissipation fin (110) has a narrowing structure (111) on both sides at the bottom, so that two fans (410) are installed on the central axial airflow duct (400) between a group of metal heat dissipation fin assemblies (300).

21. A battery pack heat dissipation structure according to claim 1, characterized in that, The heat dissipation fin assembly (100) is a T-shaped heat dissipation fin (110) with a thickness of 0.5-3 mm.

22. The battery pack heat dissipation structure according to claim 1, characterized in that, The heat dissipation fin assembly (100) is a T-shaped heat dissipation fin (110) with a thickness of 1.5 mm.

23. A battery module, characterized in that, The device includes a battery pack heat dissipation structure as described in any one of claims 1-22, and further includes a pack housing (710) and a pack cover (600); the pack housing (710) surrounds the outer periphery and bottom of the metal heat sink assembly (300), and includes four pack housing sides (711) and one pack housing bottom surface (712); the pack cover (600) can be fastened to the top of the pack housing (710).

24. A battery module according to claim 23, characterized in that, It also includes a set of cells (510) that are in contact with the metal heat sink (310).

25. A battery module according to claim 23, characterized in that, The gaps between the structural components are filled with lightweight thermally conductive material; as an optimization option, the gap between the metal heat sink (310) and the battery cell (510) is filled with thermally conductive silicone grease.

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