A bendable vapor chamber

Abstract

The utility model relates to a kind of bendable vapor chamber, comprising: the shell with bending area and non-bending area, wherein non-bending area is located bending area both sides;Liquid-absorbing core is arranged in the internal accommodation space of shell;Bending structure is located in bending area, bending structure includes strip groove, recess and convex part, strip groove is arranged on the outer plate surface of shell side, recess and convex part are arranged adjacent on the outer plate surface of shell other side;After bendable vapor chamber is bent, strip groove is located in the inside of bending angle, recess and convex part are located in the outside of bending angle.The bendable vapor chamber of the utility model, by setting strip groove in inner bending surface, recess and convex part are arranged adjacent on outer bending surface, strip groove, recess and convex part provide sufficient deformation allowance when bending, on the one hand, avoid the wrinkle deformation of inner bending surface, on the other hand, make bending area have sufficient gas passage, guarantee that the vapor chamber after bending has excellent heat dissipation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation equipment, and in particular to a bendable heat spreader. Background Technology

[0002] With the rapid development of the new energy vehicle sector, the demand for longer driving range and faster charging speeds is constantly increasing. As the power battery module, the vehicle's driving range and charging speed are directly determined; therefore, high energy density within a given volume is crucial. During vehicle operation, the power battery generates a significant amount of heat. If this heat cannot be dissipated in time, it will reduce the charging and discharging efficiency of the battery module, affecting its power output. In severe cases, it can even lead to thermal runaway, impacting the battery module's safety and lifespan. Therefore, developing high-efficiency heat dissipation methods for automotive power battery modules has become a widespread and urgent need.

[0003] Ultrathin vapor chambers are characterized by self-driving, high equivalent thermal conductivity, light weight, and compact structure, and are widely used for heat dissipation of electronic components in confined spaces. However, existing vapor chambers are generally planar structures, often used for heat dissipation of planar heat sources. With the development of the new energy vehicle industry, automotive power batteries typically use long and narrow blade batteries. During charging and discharging, the heat generated by blade batteries is mainly concentrated near the tabs, resulting in a temperature "high at both ends and low in the middle." Using planar vapor chamber structures results in low space utilization. To improve space utilization efficiency and effectively dissipate heat from blade batteries, planar vapor chamber structures are usually bent.

[0004] However, the vacuum chamber heat sink used in blade battery heat dissipation is relatively thin. If the planar heat sink is directly bent, it will damage the internal structure of the heat sink and affect the heat dissipation rate of the heat sink. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a bendable heat spreader.

[0006] A bendable heat spreader, capable of being bent along a bend line L to form a bend angle, comprises: a housing having a bend area and a non-bend area, and an accommodating space within the housing; the bend line L being located within the bend area and projected along the bend line L; the non-bend area being located on both sides of the bend area; a liquid-absorbing core disposed within the accommodating space; and a bending structure located within the bend area, comprising a strip groove, a recess, and a protrusion extending in a direction parallel to the bend line L; the strip groove being disposed on an outer plate surface on one side of the housing; the recess and the protrusion being arranged adjacently in a direction parallel to the outer plate surface of the housing and perpendicular to the bend line L, and disposed on an outer plate surface on the other side of the housing opposite to the strip groove; after bending, the strip groove is located inside the bend angle, and the recess and the protrusion are located outside the bend angle.

[0007] The bendable heat spreader of this utility model has a strip groove on the inner bending surface and adjacent concave and convex parts on the outer bending surface. When bending, the strip groove, concave and convex parts provide sufficient deformation allowance, which on the one hand avoids wrinkling deformation of the inner bending surface, and on the other hand makes the bending area have sufficient gas channels, ensuring that the heat spreader has excellent heat dissipation efficiency after bending.

[0008] Furthermore, the housing includes a first shell plate and a second shell plate with parallel surfaces, the first shell plate covering the second shell plate to form a sealed accommodating space; the strip groove is disposed on the outer surface of the first shell plate, and the recess and the protrusion are disposed on the outer surface of the second shell plate, or the strip groove is disposed on the outer surface of the second shell plate, and the recess and the protrusion are disposed on the outer surface of the first shell plate.

[0009] Furthermore, the number of the strip groove, the recess, and the protrusion is two or more.

[0010] The above technical solution allows for the setting of different numbers of strip grooves, recesses, and protrusions to accommodate the deformation allowance required during bending at different bending angles.

[0011] Furthermore, when projected along the extension direction of the bending line L, the cross-sectional shape of the strip groove, the concave portion, and the convex portion is an arc shape.

[0012] The above technical solution makes the shape change naturally when bending, effectively avoiding the formation of wrinkles.

[0013] Furthermore, the liquid-absorbing core includes a bundled woven wire mesh liquid-absorbing core and a powder sintered liquid-absorbing core. The bundled woven wire mesh liquid-absorbing core is located within the bending area, and the powder sintered liquid-absorbing core is located within the non-bending area and is connected to the bundled woven wire mesh liquid-absorbing core.

[0014] Through the above technical solutions, a bundled woven wire mesh liquid absorber core with better fixing effect is sintered and laid in the bending zone, which avoids the liquid absorber core falling off during bending and affecting the heat transfer effect of the heat spreader; an easy-to-process powder sintered liquid absorber core is sintered and laid in the non-bending zone, which reduces processing costs and facilitates mass production.

[0015] Furthermore, the porosity of the bundled woven mesh liquid-absorbing core is 50%~80%.

[0016] The above technical solutions enable the liquid-absorbing core to have excellent capillary and adsorption capabilities.

[0017] Furthermore, the bendable heat spreader also includes a liquid working fluid, which is deionized water with a resistivity of 18.2 MΩ*cm.

[0018] The above technical solution achieves heat transfer through the phase change of the liquid working fluid.

[0019] Furthermore, it also includes a number of evenly distributed support columns, which are located within the non-bending area and abut against the inner surfaces of the first shell plate and the second shell plate, respectively.

[0020] Through the above technical solution, the support column plays a supporting role, enabling the heat spreader to maintain a stable shape and structure during operation, and preventing collapse or damage caused by thermal deformation or external pressure.

[0021] Furthermore, the liquid-absorbing core is provided with a through hole, the through hole penetrating the liquid-absorbing core, and the support column passes through the through hole and abuts against the inner surfaces of the first shell plate and the second shell plate respectively.

[0022] The above technical solution avoids damage to the liquid-absorbing core caused by direct pressure from the support column.

[0023] Furthermore, the first shell plate and the second shell plate are made of copper or aluminum.

[0024] The above technical solution enables the shell to have excellent thermal conductivity. Attached Figure Description

[0025] Figure 1 A three-dimensional structural diagram of the bendable heat spreader provided by this utility model; Figure 2 The front view of the bendable heat spreader plate provided by this utility model, projected along a direction parallel to the plate surface; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the bendable heat spreader plate provided by this utility model after bending. Detailed Implementation

[0026] In its research on existing flat-plate vapor chambers, the applicant discovered that the reason why bending a flat-plate vapor chamber easily affects the heat dissipation rate is that, when a conventional flat-plate vapor chamber is bent, the inner bending surface is compressed and the outer bending surface is stretched. Due to insufficient deformation allowance, wrinkles are generated, causing blockage and resulting in insufficient gas channels, thus affecting the heat transfer rate. At the same time, due to the vibration generated during tension and compression, the conventional powder-sintered liquid absorbent core is prone to detaching from the inner wall of the vapor chamber, disrupting the liquid circulation of the working fluid and affecting the heat transfer rate. Based on this, the applicant provides a bendable vapor chamber. Based on the flat-plate vapor chamber, it provides sufficient deformation allowance by setting grooves, recesses, and protrusions in the bending area to avoid wrinkle generation. At the same time, a bundled woven wire mesh liquid absorbent core with stronger fixing ability is laid in the bending sintering to prevent detachment. This allows the bendable vapor chamber to be used as both a flat-plate vapor chamber and a bent vapor chamber, and when used as a bent vapor chamber, it can maintain good heat dissipation capacity. To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings: Please refer to Figures 1 to 4 , Figure 1 A three-dimensional structural diagram of the bendable heat spreader provided by this utility model; Figure 2 A front view of the heat spreader provided by this utility model, projected along a direction parallel to the plate surface; Figure 3 for Figure 1 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the bendable heat spreader plate provided by this utility model after bending.

[0027] This utility model provides a bendable heat spreader, including a shell 1, a liquid absorbing core 2, a liquid working fluid (not shown), several support columns 3, and a bending structure 4.

[0028] Please refer to Figure 1 and Figure 4The bendable heat spreader shell 1 has a bending area 11 and a non-bending area 12. The bendable heat spreader can be bent along a straight line parallel to the surface of the shell 1 within the bending area 11, denoted as the bending line L. In a direction parallel to the surface of the shell 1 and perpendicular to the bending line L, the non-bending area 12 is located on both sides of the bending area 11 and communicates with it. After bending along the bending line L at a certain angle, the bendable heat spreader forms a bending angle. The inner bending surface S1 and the outer bending surface S2 on the bendable heat spreader are located on the inner and outer sides of the bending angle, respectively. In this embodiment, the bending line L is located on the outer surface of one side of the shell 1; after bending, the inner bending surface S1 is located on the outer surface of one side of the shell 1, and the outer bending surface S2 is located on the outer surface of the other side of the shell 1. In addition, as needed, two or more bending zones 11 with parallel extension directions can be set to bend the bendable heat spreader plate multiple times.

[0029] Furthermore, the housing 1 includes a first shell plate 13 and a second shell plate 14 with parallel surfaces. A groove (not shown) is formed on the side of the second shell plate 14 facing the first shell plate 13. The outer peripheries of the first shell plate 13 and the second shell plate 14 are connected to form a sealed accommodating space between them. The liquid-absorbing core 2, the support column 3, and the liquid working fluid are all disposed within this accommodating space. This accommodating space is a vacuum chamber under negative pressure. In this embodiment, the vacuum degree inside the accommodating space after evacuation is 7 Pa. Preferably, the first shell plate 13 and the second shell plate 14 are made of copper or aluminum, giving the heat exchange plate good heat exchange performance.

[0030] The liquid-absorbing core 2 is a capillary structure, laid on the inner surface of one of the first shell plate 13 and / or the second shell plate 14, and separated from the inner surface of the other by a certain distance. It promotes the liquid circulation of the liquid working fluid through capillary action to achieve heat dissipation. In this embodiment, the liquid-absorbing core is sintered and laid on the inner surface of the second shell plate 14, and separated from the inner surface of the first shell plate 13 by a certain distance to accommodate the gaseous liquid working fluid. The liquid-absorbing core 2 includes a bundled woven wire mesh liquid-absorbing core 21 and a powder-sintered liquid-absorbing core 22. The bundled woven wire mesh liquid-absorbing core 21 is laid in the bending zone 11 and has a wire mesh structure formed by cross-weaving metal fibers in the same direction. Its porosity is 50%~80%, exhibiting good capillary performance and high adhesion. It is not easily dropped from the inner surface of the second shell plate 14 during bending, maintaining the stability of the bendable heat spreader structure and ensuring that the heat transfer rate of the bending zone 11 is not affected. The powder-sintered liquid-absorbing core 22 is laid in the non-bending zone 12 and is formed by solid-phase sintering of copper powder or stainless steel powder with a particle size of 100-200 mesh. It has good capillary properties and is easy to process. Laying the easily processed powder-sintered liquid-absorbing core 22 in the non-bending zone 12 reduces the processing difficulty of the bendable heat spreader and facilitates the mass production of the bendable heat spreader. Projected along the bending line L, the bundled woven wire mesh liquid-absorbing core 21 connects the two powder-sintered liquid-absorbing cores 22.

[0031] The liquid working fluid fills the accommodating space and transfers heat through phase change; deionized water is typically used. In this embodiment, the liquid working fluid is deionized water with a resistivity of 18.2 MΩ*cm.

[0032] Several support columns 3 are evenly distributed within the non-bending area 12, providing support and ensuring that the heat spreader maintains a stable shape and structure during operation, preventing collapse or damage caused by thermal deformation or external pressure. Specifically, the support columns 3 connect the first shell plate 13 and the second shell plate 14, meaning that the extension direction of the support columns 3 is from the second shell plate 14 to the first shell plate 13.

[0033] Preferably, the liquid-absorbing core 2 is further provided with a through hole 20 extending in a direction parallel to the extension direction of the support column 3. The through hole 20 penetrates the liquid-absorbing core 2, and the support column 3 passes through the through hole 20 and directly abuts against the inner surfaces of the first shell plate 13 and the second shell plate 14, so as to avoid damaging the liquid-absorbing core 2 by pressing.

[0034] The bending structure 4 is disposed on the inner bending surface S1 and the outer bending surface S2, and projected along the bending line L. The bending structure 4 is located within the bending area 11. Specifically, the bending structure 4 includes a strip groove 41, a recess 42, and a protrusion 43. The strip groove 41 is disposed on the inner bending surface S1 and extends in a direction parallel to the bending line L. When bending, the inner bending surface S1 is compressed, and the strip groove 41 deforms under pressure, providing sufficient deformation allowance and preventing wrinkles or collapse of the inner bending surface S1. The recess 42 and the protrusion 43 are disposed on the outer bending surface S2 and extend in a direction parallel to the bending line L. Projected along the bending line L, from the bending area 11 to the non-bending area 12, the recess 42 and the protrusion 43 are arranged alternately. When bent, the outer bending surface S2 is under tension, and the concave portion 42 and the convex portion 43 are deformed under tension, increasing their specific surface area. This creates sufficient gas channels at the bending angle, preventing the bending from affecting the transfer of gaseous and liquid working fluids and thus the heat transfer rate of the bendable heat spreader. Furthermore, the number of the strip grooves 41, the concave portions 42, and the convex portions 43 can be varied according to the bending angle. Within the same bending area 11, several strip grooves 41, concave portions 42, and convex portions 43 with parallel extending directions can be provided. In this embodiment, the first shell plate 13 is the inner bending surface S1, and the strip grooves 41 are provided on the outer surface of the first shell plate 13. The second shell plate 14 is the outer bending surface S2, and the concave portions 42 and the convex portions 43 are provided on the outer surface of the second shell plate 14.

[0035] Preferably, when projected along the extension direction of the bending axis, the cross-sectional shape of the strip groove 41, the concave portion 42 and the convex portion 43 is arc-shaped, so that the deformation is natural when bending and wrinkles are effectively avoided.

[0036] Compared with existing technologies, the heat spreader provided by this utility model has the following advantages: (1) The bending area 11 can be bent in any direction to form a bendable heat dissipation plate, which is suitable for the heat dissipation needs of various electronic devices, such as blade battery modules.

[0037] (2) The inner and outer bending surfaces are respectively provided with a strip groove 41, a concave part 42 and a convex part 43, which can protect the structure of the heat exchange plate when bending and avoid bending affecting the heat transfer rate of the heat exchange plate.

[0038] (3) A bundled woven wire mesh liquid absorber 21 with better fixing effect is sintered and laid in the bending zone 11 to avoid falling off during bending and affecting the heat transfer effect of the heat spreader; an easy-to-process powder sintered liquid absorber 22 is sintered and laid in the non-bending zone 12 to reduce processing costs and facilitate mass production.

[0039] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and this utility model also intends to include these modifications and variations.

Claims

1. A bendable heat spreader plate, capable of being bent along a bending line L to form a bending angle, characterized in that, include: The housing (1) has a bending area (11) and a non-bending area (12) and an accommodating space is provided inside the housing (1). The bending line L is located in the bending area (11) and is projected along the bending line L. The non-bending area (12) is located on both sides of the bending area (11). The liquid suction core (2) is placed in the accommodating space; The bending structure (4), located in the bending area (11), includes a strip groove (41), a recess (42), and a protrusion (43) extending in a direction parallel to the bending line L; the strip groove (41) is disposed on the outer plate surface of one side of the housing (1), the recess (42) and the protrusion (43) are arranged adjacently in a direction parallel to the outer plate surface of the housing (1) and perpendicular to the bending line L, and are disposed on the outer plate surface of the housing (1) on the other side opposite to the strip groove (41); after bending, the strip groove (41) is located inside the bending angle, and the recess (42) and the protrusion (43) are located outside the bending angle.

2. The bendable heat spreader plate according to claim 1, characterized in that: The housing (1) includes a first shell plate (13) and a second shell plate (14) with parallel plate surfaces. The first shell plate (13) covers the second shell plate (14) to form a sealed accommodating space. The strip groove (41) is provided on the outer plate surface of the first shell plate (13), and the recess (42) and the protrusion (43) are provided on the outer plate surface of the second shell plate (14). Alternatively, the strip groove (41) is provided on the outer plate surface of the second shell plate (14), and the recess (42) and the protrusion (43) are provided on the outer plate surface of the first shell plate (13).

3. The bendable heat spreader plate according to claim 1, characterized in that: The number of the strip groove (41), the recess (42) and the protrusion (43) is two or more.

4. The bendable heat spreader according to any one of claims 1-3, characterized in that: Projected along the extension direction of the bending line L, the cross-sectional shape of the strip groove (41), the recess (42) and the protrusion (43) is an arc shape.

5. The bendable heat spreader plate according to claim 1, characterized in that: The liquid-absorbing core (2) includes a bundled woven wire mesh liquid-absorbing core (21) and a powder sintered liquid-absorbing core (22). The bundled woven wire mesh liquid-absorbing core (21) is located in the bending area (11), and the powder sintered liquid-absorbing core (22) is located in the non-bending area (12) and is connected to the bundled woven wire mesh liquid-absorbing core (21).

6. The bendable heat spreader according to claim 5, characterized in that: The porosity of the bundled woven mesh liquid-absorbing core (21) is 50%~80%.

7. The bendable heat spreader plate according to claim 2, characterized in that: It also includes a liquid working medium, which is deionized water with a resistivity of 18.2 MΩ*cm.

8. The bendable heat spreader plate according to claim 2, characterized in that: It also includes several evenly distributed support columns (3), which are located in the non-bending area (12) and abut against the inner surfaces of the first shell plate (13) and the second shell plate (14), respectively.

9. The bendable heat spreader according to claim 8, characterized in that: The liquid-absorbing core (2) is also provided with a through hole (20), which penetrates the liquid-absorbing core (2). The support column (3) passes through the through hole (20) and abuts against the inner surfaces of the first shell plate (13) and the second shell plate (14) respectively.

10. The bendable heat spreader plate according to claim 2, characterized in that: The first shell plate (13) and the second shell plate (14) are made of copper or aluminum.

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