Sleeve type heat pipe for efficient heat dissipation of square battery and manufacturing method of sleeve type heat pipe

Abstract

The invention discloses a sleeve type heat pipe for efficient heat dissipation of a square battery and a manufacturing method of the sleeve type heat pipe, and relates to the technical field of heat pipes, the sleeve type heat pipe comprises a square barrel body assembly, the barrel wall of the square barrel body assembly is of a hollow structure to form a barrel-shaped working cavity, and the working cavity is filled with a refrigeration working medium; a battery accommodating chamber is arranged at the lower part in the square barrel body assembly; the inner peripheral wall and the inner bottom wall, corresponding to the battery containing chamber, of the square barrel assembly are heat conduction walls which can be tightly attached to the outer surface of the square battery in a matched mode so as to conduct heat to the working cavity. The position, corresponding to the heat conduction walls, in the working cavity is a refrigerant evaporation area. The peripheral wall of the upper part of the square barrel body assembly is a heat dissipation wall and is used for dissipating heat and liquefying the vapor refrigerant; a refrigeration working medium condensation area is arranged in the working cavity corresponding to the heat dissipation wall; the inner wall of the working cavity is provided with a capillary structure used for conveying a liquid refrigerant from the refrigerant condensation area to the refrigerant evaporation area. The heat transfer efficiency can be effectively improved, and the heat dissipation requirements of high heat and high heat flux of the power battery are met.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pipes, and in particular to a sleeve-type heat pipe for efficient heat dissipation of square batteries and a manufacturing method thereof. Background Art

[0002] Faced with the increasingly severe oil crisis and environmental pollution problems around the world, electric vehicles have been recognized by countries around the world as the ultimate solution to replace traditional fuel vehicles. my country regards the research on electric vehicle technology as an important measure for the upgrading of the automobile industry and the sustainable development of environmental economy. The battery thermal management system monitors and controls the battery temperature in real time, which is of great significance for optimizing the performance of the battery pack, improving the battery cycle life and preventing the battery thermal runaway. The power battery will generate a lot of heat during operation. If this heat cannot be discharged in time, the battery temperature will rise, and the high temperature will accelerate the aging of the battery. For every 1°C increase in battery temperature, the expected life will be reduced by two months. Studies have shown that the normal operating temperature range of lithium batteries is 25-40°C. When the temperature rises to the battery "contact point", it is easy to cause battery thermal runaway, resulting in a series of serious consequences such as battery electrolyte decomposition, combustion, and explosion, which seriously threatens the safety of electric vehicles. Therefore, it is necessary to ensure that the power battery works within a safe temperature range. With the continuous development of the electric vehicle industry, improving the performance and life of battery packs has become an urgent problem to be solved. The performance of the battery pack is seriously affected by the temperature uniformity of each cell in the pack. Since the battery generates heat during operation, the differences within each battery module in the battery pack increase, resulting in excessive temperature differences in the battery pack, thereby increasing the differences in battery resistance and capacity. The life and performance of the battery will also be adversely affected by excessive charge and discharge of the battery if it is in this working state for a long time. Therefore, in order to effectively dissipate heat in the power battery pack of electric vehicles, make each battery module work within a suitable temperature range, and maintain the consistency of the temperature difference of each battery module, so as to improve the performance of the power battery pack, a cooling device must be used when designing the battery pack structure. Among the existing cooling technologies, heat pipe technology is the most efficient.

[0003] The existing heat pipe mainly consists of a closed metal tube body, an internal capillary core and a refrigerant filled inside. The heat source is used to contact the evaporation end of the heat pipe, so that the heat generated by the heat source evaporates the fluid in the tube and absorbs latent heat to vaporize. The generated steam is driven by the steam pressure difference to flow to the condensation end of the heat pipe. The steam releases latent heat at the condensation end and returns to the liquid phase, returns to the evaporation end of the heat pipe through the capillary core structure, and quickly conducts heat out through the above structure. However, as the heat generation of batteries increases year by year, the existing heat pipes cannot meet such high heat requirements, so the performance of heat pipes must be improved.

[0004] The current heat dissipation field is full of various bent and flattened heat pipes. However, when the heat pipe is bent and flattened, its internal capillary structure is often damaged, causing the capillary structure to deform or fall off, thereby greatly reducing its heat transfer performance; and the existing heat pipes are limited in bending angle and cannot completely fit the surface of the square heat source for heat dissipation, and cannot effectively improve the heat dissipation efficiency. Therefore, how to provide a sleeve-type heat pipe for efficient heat dissipation of square batteries, which can be used without bending and flattening, can effectively improve the heat transfer efficiency, can effectively solve the heat dissipation needs of high heat and high heat flux of power batteries, and has the characteristics of simple structure, easy to make, and low cost has become a problem that technicians in this field urgently need to solve. Summary of the invention

[0005] In view of this, the present invention proposes a sleeve-type heat pipe for efficient heat dissipation of square batteries and a manufacturing method thereof, aiming to solve the technical problems that traditional heat pipes are easily damaged by bending, have low heat dissipation efficiency, and cannot meet the heat dissipation requirements of high heat and high heat flux of power batteries.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] In one aspect, the present invention provides a sleeve-type heat pipe for efficient heat dissipation of a square battery, comprising:

[0008] A square barrel assembly, wherein the barrel wall of the square barrel assembly is a closed hollow structure to form a barrel-shaped closed working chamber, and the working chamber is filled with a refrigerant;

[0009] One end of the square barrel assembly is a battery storage chamber; the inner peripheral wall and the inner bottom wall of the square barrel assembly corresponding to the battery storage chamber are heat-conducting walls that can be adapted to fit tightly against the outer surface of the square battery to conduct the heat dissipated by the square battery to the working chamber, and the area in the working chamber corresponding to the heat-conducting wall is a refrigerant evaporation zone;

[0010] The outer peripheral wall of the other end of the square barrel assembly is a heat dissipation wall, which is used to dissipate the heat and liquefy the vapor refrigerant; the area in the working chamber corresponding to the heat dissipation wall is a refrigerant condensation area;

[0011] A capillary structure for transporting liquid refrigerant from the refrigerant condensation area to the refrigerant evaporation area is provided on the inner wall of the working chamber.

[0012] When the sleeve-type heat pipe of the present invention is used, the barrel mouth of the square barrel assembly is arranged upward, the square battery is adapted to be installed in the battery holding chamber, and the outer wall of the square battery is closely fitted to the heat-conducting wall. The heat dissipated by the square battery during operation heats the refrigerant in the refrigerant evaporation zone through the heat-conducting wall. The refrigerant absorbs heat and evaporates to form a pressure difference between the lower and upper parts of the working chamber. The vapor refrigerant flows upward to the refrigerant condensation zone under the action of the pressure difference and is condensed and liquefied through the heat dissipation wall. The liquid refrigerant quickly flows back to the refrigerant evaporation zone under the capillary force of the capillary structure and its own gravity. The refrigerant repeatedly circulates in the working chamber to achieve rapid heat dissipation of the square battery. The sleeve-type heat pipe of the present invention has a novel structure and can tightly fit and cover square batteries on multiple sides. The contact area between the hot end and the heat source is large, which can minimize the air thermal resistance and effectively enhance the heat exchange. In addition, the hollow barrel-shaped working chamber structure improves the efficiency of liquid-vapor circulation inside the heat pipe, thereby enhancing the heat transfer capacity of the heat pipe, which is particularly beneficial for resisting transient thermal shocks and can effectively solve the needs of high heat and high heat flux. The sleeve-type heat pipe of the present invention has a simple structure, can improve the quality and yield of heat pipe manufacturing, and can reduce costs.

[0013] As a further improvement of the above technical solution, the middle part of the square barrel body assembly in the length direction is an insulating wall, and the part corresponding to the insulating wall in the working chamber is a refrigerant insulating zone; the refrigerant insulating zone is located between the refrigerant evaporation zone and the refrigerant condensation zone.

[0014] The beneficial effect of the above technical solution is that the refrigerant insulation zone is located between the refrigerant evaporation zone and the refrigerant condensation zone, which can reduce the heat loss during the refrigerant transmission process.

[0015] As a further improvement of the above technical solution, it also includes heat dissipation fins, and the heat dissipation fins are arranged on the heat dissipation wall.

[0016] The beneficial effect of the above technical solution is that the heat dissipation fins are arranged on the heat dissipation wall to quickly release the heat to the external environment to improve the heat dissipation performance.

[0017] As a further improvement of the above technical solution, the square barrel assembly includes a square outer tube body, a square inner tube body, an inner tube sealing plate, an outer tube sealing plate and an annular sealing plate;

[0018] The square outer tube body is sleeved on the periphery of the square inner tube body, and an annular steam delivery chamber 1 is defined between the inner peripheral wall surface of the square outer tube body and the outer peripheral wall surface of the square inner tube body; the annular sealing plate is fixed to one end of the square outer tube body and the square inner tube body and is adapted to block the first port of the steam delivery chamber; the inner tube sealing plate is adapted to be sealed at the other end of the square inner tube body, and the outer tube sealing plate is adapted to be sealed at the other end of the square outer tube body; the inner tube sealing plate and the outer tube sealing plate are arranged opposite to each other and define a steam delivery chamber 2 connected to the other port of the steam delivery chamber 1 between the two; the steam delivery chamber 1 and the steam delivery chamber 2 together constitute the barrel-shaped working chamber;

[0019] The outer peripheral wall of the square inner tube body and the side wall of the inner tube sealing plate close to the outer tube sealing plate are both provided with the capillary structure, and / or the inner peripheral wall of the square outer tube body and the side wall of the outer tube sealing plate close to the inner tube sealing plate are both provided with the capillary structure.

[0020] The beneficial effect of the above technical solution is that the present invention can form a square barrel body assembly through the assembly of a square outer tube body, a square inner tube body, an inner tube sealing plate, an outer tube sealing plate and an annular sealing plate. The structure is simple, and the assembled structure makes it easier to set capillary structures on the outer peripheral wall of the square inner tube body and the side wall of the inner tube sealing plate, the inner peripheral wall of the square outer tube body and the side wall of the outer tube sealing plate, and the production cost is low.

[0021] As a further improvement of the above technical solution, the capillary structure is a porous capillary structure layer or a micro-groove capillary structure layer.

[0022] The beneficial effect of the above technical solution is that the porous capillary structure layer or the micro-groove capillary structure layer can efficiently transport the liquid refrigerant from the refrigerant condensation area to the refrigerant insulation area through capillary force to improve the heat dissipation efficiency.

[0023] As a further improvement of the above technical solution, it also includes a plurality of strip-shaped partitions, which are all installed between the square outer tube body and the square inner tube body and are all arranged along the length direction of the square outer tube body. The plurality of partitions are evenly distributed along the circumference of the square inner tube body to divide the steam delivery chamber into a plurality of steam delivery channels arranged along the length direction of the square inner tube body.

[0024] The beneficial effect of the above technical solution is: by arranging multiple strip-shaped partitions in the steam delivery chamber, a pulsating heat pipe structure with multiple steam delivery channels is formed, the pulsation capacity of the heat pipe is enhanced, and the heat dissipation efficiency is improved.

[0025] As a further improvement of the above technical solution, it also includes heat dissipation fins; there are multiple square barrel body assemblies, and the multiple square barrel body assemblies are arranged in parallel and opposite to each other. The heat dissipation fins are arranged around the heat dissipation walls of the multiple square barrel body assemblies to form a heat dissipation pipe group.

[0026] The beneficial effect of the above technical solution is that the square barrel body components of the present invention can be arranged in parallel to form a heat dissipation tube group, further improving the capacity of accommodating square batteries.

[0027] Another aspect of the present invention provides a method for manufacturing a sleeve-type heat pipe for efficient heat dissipation of a square battery, comprising the following steps:

[0028] S1: Prepare materials for making square barrel body components, including a square outer tube body, a square inner tube body, an inner tube sealing plate, an outer tube sealing plate and an annular sealing plate;

[0029] S2: preparing a capillary structure, and setting a capillary structure on the inner peripheral wall of the square outer tube body, the outer peripheral wall of the square inner tube body, one side surface of the inner tube sealing plate, and one side surface of the outer tube sealing plate;

[0030] S3: Assemble the seal, seal the inner tube sealing plate at one end of the square inner tube body and make the other side of the inner tube sealing plate correspond to the inner cavity of the square inner tube body; seal the outer tube sealing plate at one end of the square outer tube body and make the one side of the outer tube sealing plate correspond to the inner cavity of the square outer tube body; nest the square inner tube body in the middle of the square outer tube body, and make the four peripheral walls of the square inner tube body correspond to the four peripheral walls of the square outer tube body one by one, and the one side of the inner tube sealing plate corresponds to the one side of the outer tube sealing plate; the inner periphery of the annular sealing plate and the other end of the square inner tube body are adapted for welding and sealing, and the outer periphery of the annular sealing plate and the other end of the square outer tube body are adapted for welding and sealing, and a certain gap is maintained between the outer peripheral wall of the square inner tube body and the inner peripheral wall of the square outer tube body, and between the one side of the inner tube sealing plate and the one side of the outer tube sealing plate, so as to form a barrel-shaped working chamber;

[0031] A refrigerant injection port is arranged on the annular sealing plate, and the refrigerant is injected into the working chamber through the refrigerant injection port and then sealed.

[0032] As a further improvement of the above technical solution, S2 includes the following steps:

[0033] S21: Strip grooves are formed on the inner peripheral wall of the square outer tube body and the outer peripheral wall of the square inner tube body along the length direction, and strip grooves are formed on one side of the inner tube sealing plate and one side of the outer tube sealing plate from the middle to the circumference to form a micro-groove capillary structure layer.

[0034] The beneficial effect of the above technical solution is that the micro-groove capillary structure layer can be grooved on the outer peripheral wall of the square outer tube body, the outer peripheral wall of the square inner tube body, the plate surface on one side of the inner tube sealing plate, and the plate surface on one side of the outer tube sealing plate by laser cutting or wire cutting. Strip grooves are provided along the length direction of the square outer tube body and the square inner tube body, which is more conducive to the rapid, directional and orderly transportation of condensed liquid refrigerant.

[0035] As a further improvement of the above technical solution, S2 further includes the following steps:

[0036] S22: preparing a sintered porous material layer or a copper mesh covered capillary structure layer, and then fixing the sintered porous material layer or the copper mesh covered capillary structure layer on the inner peripheral wall surface of the square outer tube body, the outer peripheral wall surface of the square inner tube body, the plate surface on one side of the inner tube sealing plate, and the plate surface on one side of the outer tube sealing plate by sintering to form a sintered porous capillary structure layer or a copper mesh covered capillary structure layer covering the microgroove capillary structure layer;

[0037] S23: Hydrogen atmosphere reduction: Constant temperature reduction under hydrogen atmosphere to remove the surface oxide layer, and the reduction temperature is controlled at 400-500°C.

[0038] The beneficial effects of the above technical solution are: the sintered porous capillary structure layer or the copper mesh covered capillary structure layer covering the microgroove capillary structure layer can facilitate the uniform transportation of the condensed liquid refrigerant to the microgroove capillary structure layer, and can also absorb the liquid refrigerant overflowing from the microgroove capillary structure layer, thereby improving the stability of the directional flow of the liquid refrigerant, avoiding flow interference between the vapor and liquid refrigerants during the cyclic refrigeration process, and greatly improving the heat dissipation efficiency.

[0039] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a sleeve-type heat pipe for efficient heat dissipation of square batteries and a manufacturing method thereof, which has the following advantages and beneficial effects:

[0040] The sleeve-type heat pipe for efficient heat dissipation of square batteries of the present invention has a hollow structure, and the inner wall surface of the barrel cavity of the square barrel assembly can fit tightly against the heat source, and all the heat is introduced into the refrigerant in the internal working cavity. The square inner tube body conducts heat, and the square outer tube body and the heat dissipation fins jointly dissipate heat. The refrigerant evaporation zone is adjacent to the heat-conducting wall, which is used to absorb the heat from the heat source and transfer it to the refrigerant to accelerate its vaporization; the refrigerant condensation zone is adjacent to the heat dissipation structure formed by the heat dissipation wall and the heat dissipation fins, which is used to release the heat of the vapor-state refrigerant to the external environment to accelerate its condensation; the refrigerant insulation zone is adjacent to the insulation wall and is located between the refrigerant evaporation zone and the refrigerant condensation zone, which is used to reduce the loss of heat during the transmission process; the refrigerant absorbs heat and evaporates in the refrigerant evaporation zone, and the heat is transmitted to the refrigerant through the refrigerant insulation zone. The condensation zone releases heat and condenses to form a circulating flow. Since this structure is relatively simple to manufacture, it can improve the quality and yield of heat pipe manufacturing and reduce costs. In addition, the heat pipe of the present invention improves the heat source contact area and the efficiency of liquid-vapor circulation inside the heat pipe working chamber with a hollow sleeve structure, thereby improving the heat transfer capacity of the heat pipe, which is particularly beneficial for resisting transient thermal shocks and can effectively solve high heat and high heat flux requirements. The heat pipe has a novel structure, a large contact area between the hot end and the heat source, is wrapped and tightly fits the heat source, can minimize air thermal resistance, and effectively enhance heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0042] Figure 1 A cross-sectional view of the overall structure of the sleeve-type heat pipe for efficient heat dissipation of square batteries according to the present invention along the length direction;

[0043] Figure 2 The present invention Figure 1 A schematic diagram of the structure enlargement in the middle;

[0044] Figure 3 A cross-sectional view in the vertical length direction of the sleeve-type heat pipe used for efficient heat dissipation of square batteries according to the present invention;

[0045] Figure 4 A cross-sectional view of the combined structure of the two sleeve-type heat pipes of the present invention with the short sides of the square barrel assembly closely arranged;

[0046] Figure 5 A cross-sectional view of the combined structure of two sleeve-type heat pipes of the present invention with their long sides closely arranged in a square barrel assembly;

[0047] Figure 6 A cross-sectional view of the short-side gap arrangement combined structure of the square barrel assembly of two sleeve-type heat pipes of the present invention;

[0048] Figure 7 A cross-sectional view of the combined structure of the long side gap arrangement of the square barrel assembly of two sleeve-type heat pipes of the present invention;

[0049] Figure 8 A schematic diagram of the structure of a sleeve-type pulsating heat pipe provided with a partition in the present invention;

[0050] Fig. 9 A cross-sectional view of the combined structure of two sleeve-type pulsating heat pipes of the present invention with their short sides closely arranged in a square barrel assembly;

[0051] Fig.10 A cross-sectional view of the combined structure of two sleeve-type pulsating heat pipes of the present invention with their long sides of the square barrel assembly closely arranged;

[0052] Fig.11 A cross-sectional view of the short-side gap arrangement combined structure of the square barrel assembly of two sleeve-type pulsating heat pipes of the present invention;

[0053] Fig.12A cross-sectional view of the combined structure of the long side gap arrangement of the square barrel assembly of two sleeve-type pulsating heat pipes of the present invention;

[0054] Fig.13 A three-dimensional schematic diagram of the overall structure of a sleeve-type heat pipe for efficient heat dissipation of a square battery according to the present invention;

[0055] Fig.14 A schematic diagram of the capillary structure of a sleeve-type heat pipe for efficient heat dissipation of a square battery according to the present invention;

[0056] Fig.15 The present invention Fig.14 A magnified schematic diagram of the structure at B in the middle;

[0057] Fig.16 Schematic diagram comparing the cooling effects of a sleeve-type heat pipe with a partition, a sleeve-type heat pipe without a partition, and forced air cooling according to the present invention.

[0058] In the figure: 1. square barrel assembly; 11. working chamber; 111. refrigerant evaporation zone; 112. refrigerant condensation zone; 113. refrigerant insulation zone; 12. battery storage chamber; 13. heat-conducting wall; 14. heat-dissipating wall; 15. capillary structure; 16. insulation wall; 101. square outer tube body; 102. square inner tube body; 103. inner tube sealing plate; 104. outer tube sealing plate; 105. annular sealing plate; 1051. refrigerant injection port; 106. steam conveying chamber 1; 1061. steam conveying channel; 107. steam conveying chamber 2; 2. heat-dissipating fins; 3. partition; 4. square battery. DETAILED DESCRIPTION

[0059] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0060] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0061] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] According to an embodiment of the present invention, Figures 1 to 15 As shown, the sleeve-type heat pipe for efficient heat dissipation of square batteries includes:

[0064] A square barrel assembly 1, the barrel wall of the square barrel assembly 1 is a closed hollow structure to form a barrel-shaped closed working chamber 11, and the working chamber 11 is filled with a refrigerant;

[0065] One end of the square barrel assembly 1 is a rectangular battery receiving chamber 12; the inner peripheral wall and the inner bottom wall of the square barrel assembly 1 corresponding to the battery receiving chamber 12 are heat-conducting walls 13 that can be adapted to fit tightly against the outer surface of the square battery to transfer the heat dissipated by the square battery to the working chamber 11, and the corresponding heat-conducting wall 13 in the working chamber 11 is a refrigerant evaporation area 111;

[0066] The outer peripheral wall of the other end of the square barrel assembly 1 is a heat dissipation wall 14, which is used to dissipate the heat of the vapor refrigerant and liquefy it; the area in the working chamber 11 corresponding to the heat dissipation wall 14 is a refrigerant condensation area 112;

[0067] A capillary structure 15 for conveying liquid refrigerant from the refrigerant condensation area 112 to the refrigerant evaporation area 111 is provided on the inner wall of the working chamber 11 .

[0068] When the sleeve-type heat pipe of this embodiment is used, the barrel mouth of the square barrel assembly 1 is arranged upward, the square battery is adapted and installed in the battery accommodating chamber 12, and the outer wall of the square battery is closely fitted to the heat-conducting wall 13. Heat-conducting silicone can be coated between the outer wall of the square battery and the heat-conducting wall 13 to completely isolate the air. The heat emitted by the square battery when working heats the refrigerant in the refrigerant evaporation area 111 through the heat-conducting wall 13. The refrigerant absorbs heat and evaporates to form a pressure difference between the lower and upper parts of the working chamber 11. The vapor refrigerant flows upward to the refrigerant condensation area 112 under the action of the pressure difference and dissipates heat through the heat dissipation wall 14 to condense and liquefy. The liquid refrigerant quickly flows back to the refrigerant evaporation area 111 under the capillary force of the capillary structure 15 and its own gravity. The refrigerant circulates repeatedly in the working chamber 11 to achieve rapid heat dissipation of the square battery. Figure 2 The solid arrows in the middle indicate the path and direction of the vapor refrigerant, and the hollow arrows indicate the path and direction of the liquid refrigerant. The sleeve-type heat pipe structure of the present invention is novel, and can tightly fit and cover the square battery on multiple sides. The hot end and the heat source have a large contact area, which can minimize the air thermal resistance and effectively enhance the heat exchange. In addition, the hollow barrel-shaped working chamber 11 structure improves the efficiency of the liquid-vapor circulation inside the heat pipe, thereby improving the heat transfer capacity of the heat pipe, which is particularly beneficial for resisting transient thermal shocks and can effectively solve the high heat and high heat flux requirements. The sleeve-type heat pipe structure of the present invention is simple, which can improve the quality and yield of heat pipe manufacturing and reduce costs.

[0069] Specifically, the material of the square barrel assembly 1 can be any one of gold, silver, iron or its alloy or oxide, copper or its alloy or oxide, aluminum or its alloy or oxide, and stainless steel. The refrigerant can be water, potassium, sodium, petroleum, ethanol, acetone and other organic solvents. The refrigerant can also be any fluid that is conducive to evaporation and heat dissipation, such as inorganic compounds, alcohols, ketones, liquid metals, refrigerants, organic compounds or mixtures thereof.

[0070] In some embodiments, the middle portion of the square barrel assembly 1 in the length direction is an insulating wall 16 , and the portion of the working chamber 11 corresponding to the insulating wall 16 is a refrigerant insulating zone 113 ; the refrigerant insulating zone 113 is located between the refrigerant evaporation zone 111 and the refrigerant condensation zone 112 .

[0071] Specifically, the middle portion of the outer peripheral wall of the square barrel assembly 1 is coated with a coating or wrapped with thermal insulation felt to form an insulating wall 16 to reduce heat loss.

[0072] The refrigerant insulation zone 113 is located between the refrigerant evaporation zone 111 and the refrigerant condensation zone 112 , and can reduce heat loss during the refrigerant transmission process.

[0073] In some embodiments, heat dissipation fins 2 are also included and are disposed on the heat dissipation wall 14 .

[0074] Specifically, the heat sink 2 is located on the outer peripheral side of the heat sink wall 14, and the heat sink fin 2 is made of gold, silver, iron or its alloy or oxide, copper or its alloy or oxide, aluminum or its alloy or oxide, or stainless steel; there are multiple heat sink fins 2, and the multiple heat sink fins 2 are arranged parallel to the bottom wall of the square barrel body assembly 1, perpendicular to the bottom wall of the square barrel body assembly 1, or connected to the bottom wall of the square barrel body assembly 1 at an angle; the heat sink fins 2 are fixed to the heat sink wall 14 by welding or bonding with thermal conductive adhesive.

[0075] The heat dissipation fins 2 are arranged on the heat dissipation wall 14 to quickly release the heat to the external environment to improve the heat dissipation performance.

[0076] In some embodiments, the square barrel assembly 1 includes a square outer tube body 101, a square inner tube body 102, an inner tube sealing plate 103, an outer tube sealing plate 104 and an annular sealing plate 105;

[0077] The square outer tube body 101 is sleeved on the outer circumference of the square inner tube body 102, and an annular steam delivery chamber 106 is defined between the inner circumferential wall surface of the square outer tube body 101 and the outer circumferential wall surface of the square inner tube body 102; the annular sealing plate 105 is fixed to one end of the square outer tube body 101 and the square inner tube body 102 and is adapted to block a port of the steam delivery chamber 106; the inner tube sealing plate 103 is adapted to be sealed at the other end of the square inner tube body 102, and the outer tube sealing plate 104 is adapted to be sealed at the other end of the square outer tube body 101; the inner tube sealing plate 103 and the outer tube sealing plate 104 are arranged opposite to each other and define a steam delivery chamber 2 107 connected to another port of the steam delivery chamber 106 between the two; the steam delivery chamber 106 and the steam delivery chamber 2 107 together constitute a barrel-shaped working chamber 11;

[0078] The outer peripheral wall of the square inner tube body 102 and the side wall of the inner tube sealing plate 103 close to the outer tube sealing plate 104 are both provided with capillary structures 15 , and / or the inner peripheral wall of the square outer tube body 101 and the side wall of the outer tube sealing plate 104 close to the inner tube sealing plate 103 are both provided with capillary structures 15 .

[0079] The present invention can form a square barrel body assembly 1 by assembling a square outer tube body 101, a square inner tube body 102, an inner tube sealing plate 103, an outer tube sealing plate 104 and an annular sealing plate 105. The structure is simple, and the assembled structure makes it easier to set the capillary structure 15 on the outer peripheral wall of the square inner tube body 102 and the side wall of the inner tube sealing plate 103, the inner peripheral wall of the square outer tube body 101 and the side wall of the outer tube sealing plate 104, and the manufacturing cost is low.

[0080] Specifically, the square outer tube body 101, the square inner tube body 102, the inner tube sealing plate 103 and the outer tube sealing plate 104 can be made of copper, silver, aluminum or its alloy, or other metal materials with good thermal conductivity. The dimensions of the square outer tube body 101, the square inner tube body 102, the inner tube sealing plate 103 and the outer tube sealing plate 104 are non-restrictive and can be determined by the size of the square battery or heat source. The size of the gap between the inner circumferential wall of the square outer tube body 101 and the outer circumferential wall of the square inner tube body 102, and the size of the gap between the inner tube sealing plate 103 and the outer tube sealing plate 104 can be designed according to the heat dissipation requirements of the square battery or heat source.

[0081] Specifically, a refrigerant injection port is provided on the surface of the annular sealing plate 105, and the refrigerant can be injected into the working chamber 11 through the refrigerant injection port; the working chamber 11 can also be evacuated through the refrigerant injection port; after the refrigerant is injected into the working chamber 11 and evacuated, the heat transfer caused by air convection can be eliminated, and the heat conduction loss can be reduced, which is beneficial to improving the efficiency of the refrigerant circulation refrigeration.

[0082] In some embodiments, the capillary structure 15 is a porous capillary structure layer or a micro-groove capillary structure layer.

[0083] The porous capillary structure layer or the micro-groove capillary structure layer can efficiently transport the liquid refrigerant from the refrigerant condensation area 112 to the refrigerant insulation area 113 through capillary force to improve the heat dissipation efficiency.

[0084] Specifically, the capillary structure 15 can be manufactured by sintering porous, foamed metal, copper mesh covering, microgrooves, deposited nanowires or nanoparticles, and the like.

[0085] In some embodiments, see Fig.15 The capillary structure 15 is a microgroove capillary structure layer; a plurality of strip grooves 1 are provided on the inner circumferential wall surface of the square outer tube body 101 along its length direction, and the plurality of strip grooves 1 are evenly distributed along the circumference of the square outer tube body 101; a plurality of strip grooves 2 are provided on the outer circumferential wall surface of the square inner tube body 102 along its length direction, and the plurality of strip grooves 2 are evenly distributed along the circumference of the square inner tube body 102; a plurality of strip grooves 3 are provided on one side of the inner tube sealing plate 103 from the middle to the circumferential side, and the plurality of strip grooves 3 are evenly distributed along the inner tube sealing plate 103. The plate 103 has multiple strip grooves 2 that are evenly distributed in the circumferential direction and connected one by one; a plurality of strip grooves 4 are opened on the plate surface of one side of the outer tube sealing plate 104 from the middle to the circumferential side, and the multiple strip grooves 4 are evenly distributed along the circumferential direction of the outer tube sealing plate 104 and connected one by one to the multiple strip grooves 1; the multiple strip grooves 1, the multiple strip grooves 2, the multiple strip grooves 3 and the multiple strip grooves 4 together constitute a micro-groove capillary structure layer that can transport liquid refrigerant from the refrigerant condensation area 112 to the refrigerant evaporation area 111.

[0086] Specifically, the strip groove 1, the strip groove 2, the strip groove 3 and the strip groove are all V-shaped grooves or rectangular grooves.

[0087] In some embodiments, the capillary structure 15 is a porous capillary structure layer, which is prepared by sintering metal particles, adding a porogen during the sintering process to form a porous material layer, and then sintering the porous material layer to the inner wall of the square outer tube 101, the outer wall of the square inner tube 102, the side plate surface of the inner tube sealing plate 103 and the side plate surface of the outer tube sealing plate 104 by a secondary sintering method to form a porous capillary structure layer. The porogen is one or more of potassium sulfate and barium chloride; the metal particles are copper particles, and the volume ratio of copper particles to porogen is 3.5:1; the sintering temperature of the porous capillary structure layer is controlled to be 850-920°C; and the sintering time is 30-60min.

[0088] In some embodiments, the capillary structure 15 can be made of a copper mesh covering the capillary structure layer, which is prepared by sintering a metal wire mesh, and the metal wire mesh is a 500-mesh copper mesh; a single layer or multiple layers of copper mesh are covered on the inner wall of the square outer tube body 101, the outer wall of the square inner tube body 102, one side of the inner tube sealing plate 103 and one side of the outer tube sealing plate 104 and are tightly fitted, and high-temperature sintering is used to firmly connect them to form a copper mesh covering the capillary structure layer.

[0089] In some embodiments, the capillary structure 15 can be made by depositing nanowires or nanoparticles on the inner wall of the square outer tube 101 , the outer wall of the square inner tube 102 , one side of the inner tube sealing plate 103 , and one side of the outer tube sealing plate 104 .

[0090] In some embodiments, the capillary structure 15 is a composite capillary structure formed by laying a porous capillary structure layer on a micro-groove capillary structure layer or a capillary structure layer covered with a copper mesh.

[0091] Specifically, a porous capillary structure layer or a copper mesh-covered capillary structure layer is sintered and fixed on the microgroove capillary structure layer on the inner peripheral wall of the square outer tube body 101, the outer peripheral wall of the square inner tube body 102, the side plate surface of the inner tube sealing plate 103, and the side plate surface of the outer tube sealing plate 104 to form a composite capillary structure. The porous capillary structure layer in the composite capillary structure is more conducive to the adsorption of condensed liquid refrigerant, and the liquid refrigerant is evenly transported to the microgroove capillary structure layer. The microgroove capillary structure layer has a faster transport speed for the liquid refrigerant, which can improve the circulation refrigeration efficiency; the liquid refrigerant overflowing from the microgroove capillary structure layer can also be adsorbed by the porous capillary structure layer to avoid splashing to the middle of the working chamber 11 and interfering with the circulation movement of the vaporized refrigerant. The capillary structure 15 of this embodiment can effectively improve the efficiency of the liquid-vapor circulation inside the heat pipe, and effectively meet the heat dissipation requirements of the power battery or heat source with increasing high heat and high heat flux.

[0092] In some embodiments, a plurality of strip-shaped partitions 3 are also included, and the plurality of partitions 3 are all installed between the square outer tube body 101 and the square inner tube body 102 and are all arranged along the length direction of the square outer tube body 101. The plurality of partitions 3 are evenly distributed along the circumference of the square inner tube body 102 to divide the steam delivery chamber 106 into a plurality of steam delivery channels 1061 arranged along the length direction of the square inner tube body 102.

[0093] Specifically, the two ends of the multiple strip-shaped partitions 3 in the width direction are fixed to the inner peripheral wall of the square outer tube body 101 and the outer peripheral wall of the square inner tube body 102. By arranging multiple strip-shaped partitions 3 in the steam delivery chamber 106, a sleeve-type pulsating heat pipe structure with multiple steam delivery channels 1061 is formed, which strengthens the pulsation capacity of the heat pipe and thus improves the heat dissipation efficiency. Multiple strip-shaped partitions 3 are supported between the inner peripheral wall of the square outer tube body 101 and the outer peripheral wall of the square inner tube body 102, which plays a role in increasing the rigidity of the heat pipe.

[0094] Specifically, a plurality of strip-shaped partitions 3 may also be arranged in the second steam delivery chamber 107 to divide the second steam delivery chamber 107 into a plurality of steam delivery channels (not shown in the figure) along the circumferential direction, so as to further enhance the pulsation capacity of the heat pipe and improve the heat dissipation efficiency.

[0095] In some embodiments, heat dissipation fins 2 are also included; there are multiple square barrel body assemblies 1, and the multiple square barrel body assemblies 1 are arranged in parallel and opposite to each other, and the heat dissipation walls 14 of any two adjacent square barrel body assemblies 1 are tightly fitted or arranged at intervals along their relative directions, and the heat dissipation fins 2 are arranged around the heat dissipation walls 14 of the multiple square barrel body assemblies 1 to fix the multiple square barrel body assemblies 1 in connection and form a heat dissipation pipe group.

[0096] The square barrel body assemblies 1 of the present invention can be arranged in parallel to form a heat dissipation tube group, thereby further improving the capacity for accommodating square batteries.

[0097] Another aspect of the present invention provides a method for manufacturing a sleeve-type heat pipe for efficient heat dissipation of a square battery, comprising the following steps:

[0098] S1: Matrix pretreatment: Prepare materials for making the square barrel assembly 1, including a square outer tube 101, a square inner tube 102, an inner tube sealing plate 103, an outer tube sealing plate 104 and an annular sealing plate 105, all of which are made of red copper and are polished with sandpaper to remove the surface oxide layer.

[0099] S2: Preparation of capillary structure: capillary structure is set on the inner wall surface of the square outer tube body 101, the outer wall surface of the square inner tube body 102, one side surface of the inner tube sealing plate 103 and one side surface of the outer tube sealing plate 104.

[0100] S3: Assemble the seal, seal the inner tube sealing plate 103 at one end of the square inner tube body 102 and make the other side of the inner tube sealing plate 103 correspond to the inner cavity of the square inner tube body 102; seal the outer tube sealing plate 104 at one end of the square outer tube body 101 and make one side of the outer tube sealing plate 104 correspond to the inner cavity of the square outer tube body 101; nest the square inner tube body 102 in the middle of the square outer tube body 101, and make the four peripheral walls of the square inner tube body 102 correspond to the four peripheral walls of the square outer tube body 101. The inner tube sealing plate 103 has one side plate surface corresponding to the outer tube sealing plate 104; the inner periphery of the annular sealing plate 105 is adapted to be welded and sealed with the other end of the square inner tube body 102, and the outer periphery of the annular sealing plate 105 is adapted to be welded and sealed with the other end of the square outer tube body 101, and a certain gap is maintained between the outer peripheral wall of the square inner tube body 102 and the inner peripheral wall of the square outer tube body 101, and between the plate surface of one side of the inner tube sealing plate 103 and the plate surface of one side of the outer tube sealing plate 104, so as to form a barrel-shaped working chamber 11;

[0101] A refrigerant injection port 1051 is provided on the annular sealing plate 105 , and refrigerant is injected into the working chamber 11 through the refrigerant injection port 1051 . The working chamber 11 is evacuated through the refrigerant injection port 1051 and the refrigerant injection port 1051 is sealed.

[0102] S4: Heat dissipation fin welding: The heat dissipation fins 2 are welded on the outside of the heat dissipation wall 14 of the square outer tube body 101 to enhance the heat dissipation performance.

[0103] S5: Remove impurities: Ultrasonic cleaning after polishing and vacuum drying (<100°C).

[0104] In some embodiments, S2 includes the following steps:

[0105] S21: A plurality of strip grooves are formed on the inner circumferential wall of the square outer tube body 101 and the outer circumferential wall of the square inner tube body 102 along the length direction, and a plurality of strip grooves are formed on one side of the inner tube sealing plate 103 and one side of the outer tube sealing plate 104 from the middle to the circumference to form a micro-groove capillary structure layer.

[0106] The microgrooved capillary structure layer can be made by cutting grooves on the inner peripheral wall of the square outer tube body 101, the outer peripheral wall of the square inner tube body 102, one side of the inner tube sealing plate 103, and one side of the outer tube sealing plate 104 by laser cutting or wire cutting. Strip grooves are provided along the length direction of the square outer tube body 101 and the square inner tube body 102, which is more conducive to the rapid, directional and orderly transportation of the condensed liquid refrigerant.

[0107] In some embodiments, S2 further includes the following steps:

[0108] S22: preparing a sintered porous material layer or a copper mesh covered capillary structure layer, and then fixing the sintered porous material layer or the copper mesh covered capillary structure layer on the inner peripheral wall surface of the square outer tube body 101, the outer peripheral wall surface of the square inner tube body 102, one side surface of the inner tube sealing plate 103, and one side surface of the outer tube sealing plate 104 by sintering, so as to form a sintered porous capillary structure layer or a copper mesh covered capillary structure layer covering the micro-groove capillary structure layer;

[0109] S23: Hydrogen atmosphere reduction: Constant temperature reduction under hydrogen atmosphere to remove the surface oxide layer, and the reduction temperature is controlled at 400-500°C.

[0110] The sintered porous capillary structure layer or the copper mesh covered capillary structure layer covering the microgroove capillary structure layer can facilitate the uniform transportation of the condensed liquid refrigerant to the microgroove capillary structure layer, and can also absorb the liquid refrigerant overflowing from the microgroove capillary structure layer, thereby improving the stability of the directional flow of the liquid refrigerant, avoiding flow interference between the vapor and liquid refrigerants during the cyclic refrigeration process, and greatly improving the heat dissipation efficiency.

[0111] The embodiment of the present invention uses metal particles or metal mesh to sinter and prepare porous materials, and then uses a secondary sintering method to sinter the porous materials to the inner wall of the cylindrical metal tube base, and welds and seals them to form a nested new heat pipe structure with a porous inner wall structure. Adding spacers during the welding process can form a nested new pulsating heat pipe structure with a porous inner wall structure. It can be widely used in the field of efficient thermal management of square batteries.

[0112] The embodiment of the present invention uses commercially available red copper as a substrate, uses copper particles to construct a porous matrix, constructs a nested new pulsating heat pipe with a porous inner wall structure, welds heat dissipation fins to the outer wall of the heat pipe, and then polishes the surface matrix.

[0113] Please refer to Fig.16 As shown, a comparison of the heat dissipation effects of the three cases of the sleeve-type heat pipe with partition 3 and without partition 3 and forced air cooling in the embodiment of the present invention for efficient heat dissipation of square batteries is given; the experimental results are a comparison of the cooling effect of the same battery under the same time and forced air cooling. It can be seen that after heating, the heat source temperature is 76°C, the given wind speed is 2m / s, and the wind temperature is 30°C. After the same time of cooling, the sleeve-type heat pipe with partition 3 and without partition 3 has a good heat dissipation effect. Compared with forced air cooling, the temperature in the sleeve-type heat pipe without partition 3 is reduced by 29°C, and the temperature in the sleeve-type heat pipe with partition 3 is reduced by 30.3°C.

[0114] Furthermore, since the enclosed cavity 11 formed by the sleeve-type heat pipe with the partition 3 in the embodiment of the present invention adopts a partition structure to form a pulsating structure, that is, the size of the refrigerant flow channel of the heat pipe is smaller, so that the heat pipe has better heat dissipation efficiency. On the other hand, the partition 3 not only enables the heat pipe to have more transmission channels for the circulation of the refrigerant, but also plays a supporting role to strengthen the rigidity of the sleeve-type heat pipe itself, solving the displacement and deformation problems that may occur in the sleeve-type heat pipe.

[0115] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0116] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A sleeve-type heat pipe for efficient heat dissipation of square batteries, characterized in that: include: A square barrel assembly (1), wherein the barrel wall of the square barrel assembly (1) is a closed hollow structure to form a barrel-shaped closed working chamber (11), and a refrigerant is poured into the working chamber (11); One end of the square barrel assembly (1) is a battery storage chamber (12); the inner peripheral wall and the inner bottom wall of the square barrel assembly (1) corresponding to the battery storage chamber (12) are heat-conducting walls (13) that can be adapted to be in close contact with the outer surface of the square battery to conduct heat dissipated by the square battery to the working chamber (11); and the portion of the working chamber (11) corresponding to the heat-conducting wall (13) is a refrigerant evaporation zone (111); The outer peripheral wall of the other end of the square barrel assembly (1) is a heat dissipation wall (14) used to dissipate heat and liquefy the vapor-state refrigerant; the portion of the working chamber (11) corresponding to the heat dissipation wall (14) is a refrigerant condensation area (112); A capillary structure (15) for conveying liquid refrigerant from the refrigerant condensation area (112) to the refrigerant evaporation area (111) is provided on the inner wall of the working chamber (11).

2. The sleeve-type heat pipe for efficient heat dissipation of square batteries according to claim 1, characterized in that: The middle portion of the square barrel assembly (1) in the length direction is an insulating wall (16), and the portion in the working chamber (11) corresponding to the insulating wall (16) is a refrigerant insulating zone (113); the refrigerant insulating zone (113) is located between the refrigerant evaporation zone (111) and the refrigerant condensation zone (112).

3. The sleeve-type heat pipe for efficient heat dissipation of square batteries according to claim 2, characterized in that: It also comprises heat dissipation fins (2), wherein the heat dissipation fins (2) are arranged on the heat dissipation wall (14).

4. The sleeve-type heat pipe for efficient heat dissipation of square batteries according to claim 1, characterized in that: The square barrel body assembly (1) comprises a square outer tube body (101), a square inner tube body (102), an inner tube sealing plate (103), an outer tube sealing plate (104) and an annular sealing plate (105); The square outer tube body (101) is sleeved on the outer circumference of the square inner tube body (102), and defines an annular steam delivery chamber (106) between the inner circumferential wall surface of the square outer tube body (101) and the outer circumferential wall surface of the square inner tube body (102); the annular sealing plate (105) is fixed to one end of the square outer tube body (101) and the square inner tube body (102) and is adapted to seal a port of the steam delivery chamber (106); the inner tube sealing plate (103) is adapted to The outer tube sealing plate (104) is adapted to be sealed at the other end of the square inner tube body (102); the inner tube sealing plate (103) and the outer tube sealing plate (104) are arranged opposite to each other and define a steam delivery chamber (107) therebetween, which is connected to the other end of the steam delivery chamber (106); the steam delivery chamber (106) and the steam delivery chamber (107) together constitute the barrel-shaped working chamber (11); The capillary structure (15) is provided on the outer peripheral wall of the square inner tube body (102) and the side wall of the inner tube sealing plate (103) close to the outer tube sealing plate (104), and / or the capillary structure (15) is provided on the inner peripheral wall of the square outer tube body (101) and the side wall of the outer tube sealing plate (104) close to the inner tube sealing plate (103).

5. The sleeve-type heat pipe for efficient heat dissipation of square batteries according to claim 4, characterized in that: The capillary structure (15) is a porous capillary structure layer or a micro-groove capillary structure layer.

6. The sleeve-type heat pipe for efficient heat dissipation of square batteries according to claim 4, characterized in that: It also includes a plurality of strip-shaped partitions (3), wherein the plurality of partitions (3) are installed between the square outer tube body (101) and the square inner tube body (102) and are arranged along the length direction of the square outer tube body (101); the plurality of partitions (3) are evenly distributed along the circumference of the square inner tube body (102) so as to divide the steam conveying chamber (106) into a plurality of steam conveying channels arranged along the length direction of the square inner tube body (102).

7. The sleeve-type heat pipe for efficient heat dissipation of square batteries according to claim 1, characterized in that: It also includes heat dissipation fins (2); the square barrel body components (1) are multiple, the multiple square barrel body components (1) are arranged in parallel and relative to each other, and the heat dissipation fins (2) are arranged around the heat dissipation walls (14) of the multiple square barrel body components (1) to form a heat dissipation pipe group.

8. A method for manufacturing a sleeve-type heat pipe for efficient heat dissipation of a square battery as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1: preparing materials for making a square barrel body assembly (1), including a square outer tube body (101), a square inner tube body (102), an inner tube sealing plate (103), an outer tube sealing plate (104) and an annular sealing plate (105); S2: preparing a capillary structure, and arranging the capillary structure on the inner peripheral wall surface of the square outer tube body (101), the outer peripheral wall surface of the square inner tube body (102), one side surface of the inner tube sealing plate (103), and one side surface of the outer tube sealing plate (104); S3: Assembling and sealing, sealing the inner tube sealing plate (103) at one end of the square inner tube body (102) and making the other side plate surface of the inner tube sealing plate (103) correspond to the inner cavity of the square inner tube body (102); sealing the outer tube sealing plate (104) at one end of the square outer tube body (101) and making the side plate surface of the outer tube sealing plate (104) correspond to the inner cavity of the square outer tube body (101); nesting the square inner tube body (102) in the middle of the square outer tube body (101), and making the four peripheral wall surfaces of the square inner tube body (102) correspond to the four peripheral wall surfaces of the square outer tube body (101) one by one. The inner tube sealing plate (103) has a side plate surface corresponding to the side plate surface of the outer tube sealing plate (104); the inner circumference of the annular sealing plate (105) and the other end of the square inner tube body (102) are welded and sealed, and the outer circumference of the annular sealing plate (105) and the other end of the square outer tube body (101) are welded and sealed, and a certain gap is maintained between the outer circumferential wall of the square inner tube body (102) and the inner circumferential wall of the square outer tube body (101), and between the side plate surface of the inner tube sealing plate (103) and the side plate surface of the outer tube sealing plate (104), so as to form a barrel-shaped working chamber (11); A refrigerant injection port is provided on the annular sealing plate (105), and refrigerant is injected into the working chamber (11) through the refrigerant injection port and then sealed.

9. The method for manufacturing a sleeve-type heat pipe for efficient heat dissipation of square batteries according to claim 8, characterized in that: S2 includes the following steps: S21: Strip grooves are formed on the inner circumferential wall of the square outer tube body (101) and the outer circumferential wall of the square inner tube body (102) along the length direction, and strip grooves are formed on one side of the inner tube sealing plate (103) and one side of the outer tube sealing plate (104) from the middle to the circumference to form a micro-groove capillary structure layer.

10. The method for manufacturing a sleeve-type heat pipe for efficient heat dissipation of square batteries according to claim 9, characterized in that: S2 also includes the following steps: S22: preparing a sintered porous material layer or a copper mesh covered capillary structure layer, and then fixing the sintered porous material layer or the copper mesh covered capillary structure layer on the inner peripheral wall surface of the square outer tube body (101), the outer peripheral wall surface of the square inner tube body (102), one side surface of the inner tube sealing plate (103), and one side surface of the outer tube sealing plate (104) by sintering, so as to form a sintered porous capillary structure layer or a copper mesh covered capillary structure layer covering the micro-groove capillary structure layer; S23: Hydrogen atmosphere reduction: Constant temperature reduction under hydrogen atmosphere to remove the surface oxide layer, and the reduction temperature is controlled at 400-500°C.

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