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

Abstract

The invention discloses a sleeve type heat pipe for heat dissipation of a cylindrical 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 cylindrical barrel assembly, the barrel wall of the cylindrical barrel assembly is of a hollow structure so as to form a barrel-shaped sealed working cavity, and the working cavity is filled with a refrigerant; a battery accommodating chamber is arranged at one end part in the cylindrical barrel assembly; the inner circumferential wall, corresponding to the battery containing chamber, of the cylindrical barrel assembly is a heat conduction wall which can be tightly attached to the outer surface of the cylindrical battery in a matched mode so as to conduct heat to the working cavity. The position, corresponding to the heat conduction wall, in the working cavity is a refrigerant evaporation area. The peripheral wall of the other end part of the cylindrical barrel assembly is a heat dissipation wall and is used for dissipating heat, condensing 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 heat dissipation of cylindrical 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 cylindrical heat source for heat dissipation, and cannot effectively improve the heat dissipation efficiency. Therefore, how to provide a sleeve-type heat pipe for cylindrical battery heat dissipation, 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 heat dissipation of cylindrical 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 heat dissipation of cylindrical batteries, comprising:

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

[0009] One end of the cylindrical barrel assembly is a battery storage chamber; the inner circumferential wall of the cylindrical barrel assembly corresponding to the battery storage chamber is a heat-conducting wall that can be adapted to be close to the outer surface of the cylindrical battery to conduct the heat dissipated by the cylindrical battery to the working chamber, and the area in the working chamber corresponding to the heat-conducting wall is a refrigerant evaporation area;

[0010] The outer peripheral wall of the other end of the cylindrical barrel assembly is a heat dissipation wall, which is used to dissipate heat and condense the vapor refrigerant into liquid; 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 in use, the barrel mouth of the cylindrical barrel assembly can be arranged upward, the cylindrical battery is adapted to be installed in the battery receiving chamber, and the outer wall of the cylindrical battery is closely fitted to the heat-conducting wall. The heat dissipated by the cylindrical 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 condenses and liquefies 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 cylindrical battery. The sleeve-type heat pipe of the present invention has a novel structure and can tightly fit and wrap cylindrical 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 cylindrical sealed 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 cylindrical barrel 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 cylindrical barrel assembly includes a circular outer tube body, a circular inner tube body, an annular sealing plate 1 and an annular sealing plate 2;

[0018] The circular outer tube body is sleeved on the outer circumference of the circular inner tube body, and an annular steam delivery chamber is formed between the circumferential wall surface of the circular outer tube body and the circumferential wall surface of the circular inner tube body, the annular sealing plate 1 is fixed to one end of the circular outer tube body and the circular inner tube body and blocks one port of the steam delivery chamber, and the annular sealing plate 2 is fixed to the other end of the circular outer tube body and the circular inner tube body and blocks the other port of the steam delivery chamber to form the cylindrical barrel assembly; the circumferential wall surface of the circular outer tube body, the circumferential wall surface of the circular inner tube body and the inner side wall surfaces of the annular sealing plate 1 and the annular sealing plate 2 together enclose and define a cylindrical closed working chamber;

[0019] The outer peripheral wall of the circular inner tube body and the inner peripheral wall of the circular outer tube body are both provided with capillary structures; a cylindrical steam conveying chamber is defined between the capillary structures corresponding to the outer peripheral wall of the circular inner tube body and the capillary structures corresponding to the outer peripheral wall of the circular outer tube body in the working chamber.

[0020] The beneficial effect of the above technical solution is that the present invention can form a cylindrical barrel assembly by assembling a circular outer tube body, a circular inner tube body, an annular sealing plate one and annular sealing plate two. The structure is simple, and the assembled structure makes it easier to set a capillary structure on the outer peripheral wall of the circular inner tube body and the outer peripheral wall of the circular outer tube body, 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 circular outer tube body and the circular inner tube body and are all arranged along the length direction of the circular outer tube body. The plurality of partitions are evenly distributed along the circumference of the circular inner tube body to divide the steam delivery chamber into a plurality of steam delivery channels arranged along the length direction of the circular inner tube body.

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

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

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

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

[0028] S1: preparing materials for making a cylindrical barrel assembly, including a circular outer tube body, a circular inner tube body, an annular sealing plate 1 and an annular sealing plate 2;

[0029] S2: preparing a capillary structure, and setting the capillary structure on the inner peripheral wall surface of the circular outer tube body and the outer peripheral wall surface of the circular inner tube body;

[0030] S3: Assemble the seal, coaxially nest the circular inner tube body in the middle of the circular outer tube body, and leave a certain gap between the outer circumferential wall of the circular inner tube body and the inner circumferential wall of the circular outer tube body to form a cylindrical cavity; weld and fix the annular sealing plate 1 to the circular outer tube body and one end of the circular inner tube body and seal one end of the cylindrical cavity, weld and fix the annular sealing plate 2 to the other end of the circular outer tube body and the circular inner tube body and seal the other end of the cylindrical cavity to form a cylindrical sealed working cavity;

[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 provided on the outer peripheral wall of the circular outer tube body and the outer peripheral wall of the circular inner tube body along the length direction 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 made by slotting the outer circumferential wall of the circular outer tube body and the outer circumferential wall of the circular inner tube body by laser cutting or wire cutting. Strip grooves are provided along the length direction of the circular outer tube body and the circular inner tube body, which is more conducive to the rapid, directional and orderly transportation of the 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 circular outer tube body and the outer peripheral wall surface of the circular inner tube body 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 heat dissipation of cylindrical batteries and a manufacturing method thereof, which has the following advantages and beneficial effects:

[0040] The sleeve-type heat pipe for heat dissipation of cylindrical batteries of the present invention has a hollow structure, and the inner wall surface of the barrel cavity of the cylindrical barrel assembly can fit tightly against the heat source, and all the heat is introduced into the refrigerant in the internal working cavity. The circular inner tube body conducts heat, and the circular 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 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 1A cross-sectional view of the overall structure of a sleeve-type heat pipe for heat dissipation of a cylindrical battery 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 a sleeve-type heat pipe for heat dissipation of a cylindrical battery according to the present invention;

[0045] Figure 4 A cross-sectional view of the closely arranged combined structure of the cylindrical barrel components of the two sleeve-type heat pipes of the present invention;

[0046] Figure 5 A cross-sectional view of the gap arrangement combined structure of the cylindrical barrel components of two sleeve-type heat pipes of the present invention;

[0047] Figure 6 A schematic diagram of the structure of a sleeve-type pulsating heat pipe provided with a partition in the present invention;

[0048] Figure 7 A cross-sectional view of a closely arranged combined structure of two cylindrical barrel assemblies of a sleeve-type pulsating heat pipe provided with a partition according to the present invention;

[0049] Figure 8 A cross-sectional view of the gap arrangement combined structure of two cylindrical barrel components of a sleeve-type pulsating heat pipe provided with a partition according to the present invention;

[0050] Fig. 9 A three-dimensional schematic diagram of the overall structure of a sleeve-type heat pipe for heat dissipation of cylindrical batteries according to the present invention;

[0051] Fig.10 A schematic diagram of a capillary structure of a sleeve-type heat pipe for heat dissipation of a cylindrical battery according to the present invention;

[0052] Fig.11 The present invention Fig.10 A magnified schematic diagram of the structure at B in the middle;

[0053] Fig.12 A schematic diagram of a working chamber of a sleeve-type heat pipe for heat dissipation of a cylindrical battery according to the present invention, in which a spacer is arranged;

[0054] Fig.13 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.

[0055] In the figure: 1. Cylindrical 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. Insulating wall; 101. Circular outer tube body; 102. Circular inner tube body; 103. Annular sealing plate 1; 1031. Refrigerant liquid injection port; 104. Annular sealing plate 2; 105. Steam transport chamber; 1051. Steam transport channel; 2. Heat dissipating fins; 3. Partition plate; 4. Cylindrical battery; 5. Heat dissipating tube group. DETAILED DESCRIPTION

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] According to an embodiment of the present invention, Figures 1 to 12 As shown, a sleeve-type heat pipe for heat dissipation of cylindrical batteries includes:

[0061] A cylindrical barrel assembly 1, the barrel wall of the cylindrical barrel assembly 1 is a closed hollow structure to form a cylindrical sealed working chamber 11, and the working chamber 11 is filled with a refrigerant;

[0062] One end of the cylindrical barrel assembly 1 is a cylindrical battery receiving chamber 12; the inner peripheral wall of the cylindrical barrel assembly 1 corresponding to the battery receiving chamber 12 is a heat-conducting wall 13 that can be adapted to be close to the outer surface of the cylindrical battery to conduct the heat dissipated by the cylindrical battery to the working chamber 11, and the corresponding heat-conducting wall 13 in the working chamber 11 is a refrigerant evaporation area 111;

[0063] The outer peripheral wall of the other end of the cylindrical barrel assembly 1 is a heat dissipation wall 14, which is used to dissipate heat and condense the vapor refrigerant into liquid; the portion of the working chamber 11 corresponding to the heat dissipation wall 14 is a refrigerant condensation area 112;

[0064] 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 .

[0065] When the sleeve-type heat pipe of this embodiment is used, the barrel mouth of the cylindrical barrel assembly 1 is arranged upward, the cylindrical battery is adapted to be installed in the battery accommodating chamber 12, and the outer wall of the cylindrical battery is closely fitted to the heat-conducting wall 13. Heat-conducting silicone can be coated between the outer wall of the cylindrical battery and the heat-conducting wall 13 to completely isolate the air. The heat emitted by the cylindrical battery during operation 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 cylindrical 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 of the present invention has a novel structure, can be tightly fitted to cover the cylindrical battery on multiple sides, has a large contact area between the hot end and the heat source, can minimize the air thermal resistance, and effectively enhance the heat exchange; in addition, the hollow cylindrical sealed 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 of the present invention has a simple structure, can improve the quality and yield of heat pipe manufacturing, and can reduce costs.

[0066] Specifically, the material of the cylindrical 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.

[0067] In some embodiments, the middle portion of the cylindrical 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 .

[0068] Specifically, the middle portion of the outer peripheral wall of the cylindrical barrel assembly 1 is coated with a coating or wrapped with thermal insulation felt to form an insulating wall 16 to reduce heat loss.

[0069] 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.

[0070] In some embodiments, heat dissipation fins 2 are also included and are disposed on the heat dissipation wall 14 .

[0071] Specifically, the heat dissipation fins 2 are located on the outer peripheral side of the heat dissipation wall 14, and the heat dissipation fins 2 are made of gold, silver, iron or its alloys or oxides, copper or its alloys or oxides, aluminum or its alloys or oxides, or stainless steel; there are multiple heat dissipation fins 2, and the multiple heat dissipation fins 2 are arranged parallel to the bottom wall of the cylindrical barrel assembly 1, perpendicular to the bottom wall of the cylindrical barrel assembly 1, or connected at an angle to the bottom wall of the cylindrical barrel assembly 1; the heat dissipation fins 2 are fixed to the heat dissipation wall 14 by welding or bonding with thermal conductive adhesive.

[0072] 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.

[0073] In some embodiments, the cylindrical barrel assembly 1 includes a circular outer tube 101, a circular inner tube 102, an annular sealing plate 1 103 and an annular sealing plate 2 104;

[0074] The circular outer tube body 101 is sleeved on the outer circumference of the circular inner tube body 102, and an annular steam delivery chamber 105 is formed between the inner circumferential wall surface of the circular outer tube body 101 and the outer circumferential wall surface of the circular inner tube body 102. The annular sealing plate 103 is fixed to one end of the circular outer tube body 101 and the circular inner tube body 102 and blocks one end of the steam delivery chamber 105. The annular sealing plate 2 104 is fixed to the other end of the circular outer tube body 101 and the circular inner tube body 102 and blocks the other end of the steam delivery chamber 105 to form a cylindrical barrel assembly 1; the inner circumferential wall surface of the circular outer tube body 101, the outer circumferential wall surface of the circular inner tube body 102, and the inner side walls of the annular sealing plate 103 and the annular sealing plate 2 104 together enclose and define a cylindrical closed working chamber 11;

[0075] The outer wall of the circular inner tube body 102 and the inner wall of the circular outer tube body 101 are both provided with capillary structures 15 ; a cylindrical steam delivery chamber 105 is defined between the capillary structures 15 corresponding to the outer wall of the circular inner tube body 102 and the inner wall of the circular outer tube body 101 in the working chamber 11 .

[0076] In this embodiment, a cylindrical barrel assembly 1 can be assembled by a circular outer tube body 101, a circular inner tube body 102, an annular sealing plate 103 and an annular sealing plate 2 104. The structure is simple, and the assembled structure makes it easier to set the capillary structure 15 on the outer circumferential wall of the circular inner tube body 102 and the inner circumferential wall of the circular outer tube body 101, and the manufacturing cost is low.

[0077] Specifically, the circular outer tube 101, the circular inner tube 102, the annular sealing plate 1 103 and the annular sealing plate 2 104 can be made of copper, silver, aluminum or its alloy, or other metal materials with good thermal conductivity. The dimensions of the circular outer tube 101, the circular inner tube 102, the annular sealing plate 1 103 and the annular sealing plate 2 104 are non-restrictive and can be determined by the size of the cylindrical battery or heat source. The size of the gap between the inner circumferential wall of the circular outer tube 101 and the outer circumferential wall of the circular inner tube 102 can be designed according to the heat dissipation requirements of the cylindrical battery or heat source.

[0078] Specifically, a refrigerant injection port 1031 is provided on the surface of the annular sealing plate 103 and / or the annular sealing plate 2 104, and the refrigerant can be injected into the working chamber 11 through the refrigerant injection port 1031; the working chamber 11 can also be evacuated through the refrigerant injection port 1031; 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.

[0079] In some embodiments, the capillary structure 15 is a porous capillary structure layer or a micro-groove capillary structure layer.

[0080] 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.

[0081] Specifically, the capillary structure 15 can be manufactured by sintering porous, foamed metal, copper mesh covering, microgrooves, deposited nanowires or nanoparticles, and the like.

[0082] In some embodiments, see Fig.11 and Fig.12 The capillary structure 15 is a micro-groove capillary structure layer; a plurality of strip grooves 1 are opened on the inner circumferential wall surface of the circular outer tube body 101 along its length direction, and the plurality of strip grooves 1 are evenly distributed along the circumference of the circular outer tube body 101; a plurality of strip grooves 2 are opened on the outer circumferential wall surface of the circular inner tube body 102 along its length direction, and the plurality of strip grooves 2 are evenly distributed along the circumference of the circular inner tube body 102; the plurality of strip grooves 1 and the plurality of strip grooves 2 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.

[0083] Specifically, the first strip groove and the second strip groove are both V-shaped grooves or rectangular grooves.

[0084] 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 circular outer tube 101 and the outer wall of the circular inner tube 102 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.

[0085] 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 circumferential wall of the circular outer tube body 101 and the outer circumferential wall of the circular inner tube body 102 and fit tightly, and high-temperature sintering is used to firmly connect them to form a copper mesh covering the capillary structure layer.

[0086] In some embodiments, the capillary structure 15 can be manufactured by depositing nanowires or nanoparticles on the inner circumferential wall surface of the circular outer tube 101 and the outer circumferential wall surface of the circular inner tube 102 .

[0087] 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.

[0088] 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 circumferential wall of the circular outer tube body 101 and the outer circumferential wall of the circular inner tube body 102 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.

[0089] In some embodiments, see Fig.12 , and also includes a plurality of strip-shaped partitions 3, which are all installed between the circular outer tube body 101 and the circular inner tube body 102 and are all arranged along the length direction of the circular outer tube body 101. The plurality of partitions 3 are evenly distributed along the circumference of the circular inner tube body 102 to divide the steam delivery chamber 105 into a plurality of steam delivery channels 1051 arranged along the length direction of the circular inner tube body 102.

[0090] Specifically, the two ends of the multiple strip-shaped partitions 3 in the width direction are fixed to the inner circumferential wall of the circular outer tube body 101 and the outer circumferential wall of the circular inner tube body 102. By arranging multiple strip-shaped partitions 3 in the steam delivery chamber 105, a sleeve-type pulsating heat pipe structure with multiple steam delivery channels 1051 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 circumferential wall of the circular outer tube body 101 and the outer circumferential wall of the circular inner tube body 102, which plays a role in increasing the rigidity of the heat pipe.

[0091] In some embodiments, heat dissipation fins 2 are also included; there are multiple cylindrical barrel assemblies 1, and the multiple cylindrical barrel assemblies 1 are arranged in parallel and opposite to each other, and the heat dissipation walls 14 of any two adjacent cylindrical barrel 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 cylindrical barrel assemblies 1 to fix the multiple cylindrical barrel assemblies 1 in connection and form a heat dissipation pipe group 5.

[0092] The cylindrical barrel assemblies 1 of the present invention can be arranged in parallel to form a heat dissipation tube group 5, further improving the capacity of accommodating cylindrical batteries.

[0093] Another aspect of the present invention provides a method for manufacturing a sleeve-type heat pipe for heat dissipation of a cylindrical battery, comprising the following steps:

[0094] S1: Matrix pretreatment: Prepare materials for making the cylindrical barrel assembly 1, including a circular outer tube 101, a circular inner tube 102, an annular sealing plate 1 103 and an annular sealing plate 2 104, all of which are made of red copper and are polished with sandpaper to remove the surface oxide layer.

[0095] S2: Preparation of capillary structure: a capillary structure is provided on the inner peripheral wall surface of the circular outer tube body 101 and the outer peripheral wall surface of the circular inner tube body 102 .

[0096] S3: Assemble the seal, coaxially nest the circular inner tube body 102 in the middle of the circular outer tube body 101, and leave a certain gap between the outer circumferential wall of the circular inner tube body 102 and the inner circumferential wall of the circular outer tube body 101, so as to form a cylindrical cavity; weld and fix the annular sealing plate 103 to one end of the circular outer tube body 101 and the circular inner tube body 102 and seal one end of the cylindrical cavity, weld and fix the annular sealing plate 2 104 to the other end of the circular outer tube body 101 and the circular inner tube body 102 and seal the other end of the cylindrical cavity, so as to form a cylindrical sealed working chamber 11;

[0097] A refrigerant injection port 1031 is provided on the annular sealing plate 103 and / or the annular sealing plate 2 104 , and the refrigerant is injected into the working chamber 11 through the refrigerant injection port 1031 , and the working chamber 11 is evacuated through the refrigerant injection port 1031 and the refrigerant injection port 1031 is sealed.

[0098] S4: Heat dissipation fin welding: The heat dissipation fins 2 are welded on the outside of the heat dissipation wall 14 of the circular outer tube body 101 to enhance the heat dissipation performance.

[0099] S5: Remove impurities: Ultrasonic cleaning after polishing, vacuum drying <100℃.

[0100] In some embodiments, S2 includes the following steps:

[0101] S21: A plurality of strip-shaped grooves are formed on the inner peripheral wall of the circular outer tube body 101 and the outer peripheral wall of the circular inner tube body 102 along the length direction to form a micro-groove capillary structure layer.

[0102] The microgrooved capillary structure layer can be made by cutting grooves on the inner wall of the circular outer tube 101 and the outer wall of the circular inner tube 102 by laser cutting or wire cutting. Strip grooves are provided along the length direction of the circular outer tube 101 and the circular inner tube 102, which is more conducive to the rapid, directional and orderly transportation of the condensed liquid refrigerant.

[0103] In some embodiments, S2 further includes the following steps:

[0104] 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 circumferential wall surface of the circular outer tube body 101 and the outer circumferential wall surface of the circular inner tube body 102 by sintering to form a sintered porous capillary structure layer or a copper mesh covered capillary structure layer covering the microgroove capillary structure layer;

[0105] 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.

[0106] 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.

[0107] 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 cylindrical batteries.

[0108] 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.

[0109] Please refer to Fig.13 As shown, 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 heat dissipation of cylindrical batteries are compared; the experimental results are the 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 23.5°C, and the temperature in the sleeve-type heat pipe with partition 3 is reduced by 27°C.

[0110] 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.

[0111] 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.

[0112] 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 heat dissipation of cylindrical batteries, characterized in that: include: A cylindrical barrel assembly (1), wherein the barrel wall of the cylindrical barrel assembly (1) is a closed hollow structure to form a cylindrical sealed working chamber (11), wherein the working chamber (11) is filled with a refrigerant; One end of the cylindrical barrel assembly (1) is a battery receiving chamber (12); the inner peripheral wall of the cylindrical barrel assembly (1) corresponding to the battery receiving chamber (12) is a heat-conducting wall (13) that can be adapted to be in close contact with the outer surface of the cylindrical battery to conduct heat dissipated by the cylindrical 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 cylindrical barrel assembly (1) is a heat dissipation wall (14) for dissipating heat and condensing the vapor refrigerant into liquid; the portion of the working chamber (11) corresponding to the heat dissipation wall (14) is a refrigerant condensation zone (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. A sleeve-type heat pipe for heat dissipation of cylindrical batteries according to claim 1, characterized in that: The middle part of the cylindrical 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. A sleeve-type heat pipe for heat dissipation of cylindrical 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. A sleeve-type heat pipe for heat dissipation of cylindrical batteries according to claim 1, characterized in that: The cylindrical barrel assembly (1) comprises a circular outer tube (101), a circular inner tube (102), an annular sealing plate 1 (103) and an annular sealing plate 2 (104); The circular outer tube (101) is sleeved on the outer circumference of the circular inner tube (102), and an annular steam delivery chamber (105) is formed between the inner circumferential wall surface of the circular outer tube (101) and the outer circumferential wall surface of the circular inner tube (102). The annular sealing plate 1 (103) is fixed to one end of the circular outer tube (101) and the circular inner tube (102) and blocks a port of the steam delivery chamber (105). The annular sealing plate 2 (103) is fixed to one end of the circular outer tube (101) and the circular inner tube (102) and blocks a port of the steam delivery chamber (105). 4) fixed to the other end of the circular outer tube (101) and the circular inner tube (102) and blocking the other end of the steam delivery chamber (105) to form the cylindrical barrel assembly (1); the inner peripheral wall surface of the circular outer tube (101), the outer peripheral wall surface of the circular inner tube (102) and the inner side wall surfaces of the annular sealing plate 1 (103) and the annular sealing plate 2 (104) together enclose and define a cylindrical closed working chamber (11); The outer circumferential wall of the circular inner tube body (102) and the inner circumferential wall of the circular outer tube body (101) are both provided with a capillary structure (15); a cylindrical steam delivery chamber (105) is defined between the capillary structure (15) corresponding to the outer circumferential wall of the circular inner tube body (102) and the capillary structure (15) corresponding to the inner circumferential wall of the circular outer tube body (101) in the working chamber (11).

5. A sleeve-type heat pipe for heat dissipation of cylindrical 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. A sleeve-type heat pipe for heat dissipation of cylindrical batteries according to claim 4, characterized in that: It also comprises a plurality of strip-shaped partitions (3), wherein the plurality of partitions (3) are installed between the circular outer tube body (101) and the circular inner tube body (102) and are arranged along the length direction of the circular outer tube body (101), and the plurality of partitions (3) are evenly distributed along the circumference of the circular inner tube body (102) so as to divide the steam conveying cavity (105) into a plurality of steam conveying channels (1051) arranged along the length direction of the circular inner tube body (102).

7. A sleeve-type heat pipe for heat dissipation of cylindrical batteries according to claim 1, characterized in that: It also includes heat dissipation fins (2); there are multiple cylindrical barrel assemblies (1), the multiple cylindrical barrel assemblies (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 cylindrical barrel assemblies (1) to form a heat dissipation pipe group (5).

8. A method for manufacturing a sleeve-type heat pipe for heat dissipation of cylindrical batteries as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1: preparing materials for making a cylindrical barrel assembly (1), including a circular outer tube (101), a circular inner tube (102), an annular sealing plate 1 (103) and an annular sealing plate 2 (104); S2: preparing a capillary structure, and setting the capillary structure on the inner peripheral wall surface of the circular outer tube body (101) and the outer peripheral wall surface of the circular inner tube body (102); S3: Assembling the seal, coaxially nesting the circular inner tube (102) in the middle of the circular outer tube (101), and leaving a certain gap between the outer circumferential wall of the circular inner tube (102) and the inner circumferential wall of the circular outer tube (101), so as to form a cylindrical cavity; welding and fixing an annular sealing plate 1 (103) to one end of the circular outer tube (101) and the circular inner tube (102) and sealing one end of the cylindrical cavity; welding and fixing annular sealing plate 2 (104) to the other end of the circular outer tube (101) and the circular inner tube (102) and sealing the other end of the cylindrical cavity, so as to form a cylindrical sealed 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 heat dissipation of cylindrical batteries according to claim 8, characterized in that: S2 includes the following steps: S21: Strip-shaped grooves are provided on the inner peripheral wall surface of the circular outer tube body (101) and the outer peripheral wall surface of the circular inner tube body (102) along the length direction to form a micro-groove capillary structure layer.

10. The method for manufacturing a sleeve-type heat pipe for heat dissipation of cylindrical 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 circular outer tube body (101) and the outer peripheral wall surface of the circular inner tube body (102) 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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