Unequal thickness bendable liquid cooling module and manufacturing method thereof and folding screen terminal

Abstract

The present invention relates to the field of thermal management technology for foldable screen electronic terminals, and in particular to a bendable liquid-cooled heat dissipation module of unequal thickness, a manufacturing method, and a foldable screen terminal, wherein the bendable liquid-cooled heat dissipation module of unequal thickness comprises a flow channel substrate having a flow channel film material and a panel film material, wherein the flow channel film material and the panel film material are stacked and sealed by splicing thick sections and thin sections with splicing gaps; the flow channel film material and the panel film material after being stacked and sealed with each other are hot-melt-sealed at the two end positions of the splicing gap to form joints, thereby constituting a flow channel substrate having a flow path passing through the thick section and the thin section between two adjacent thick sections; this solves the problem of irreversible degradation of the film material in the hot-pressing area caused by the hot-pressing thinning method of traditional unequal thickness flow channel substrates, and can reduce the requirements for sealing equipment and tooling, thereby efficiently and reliably achieving the sealing of the flow channel substrate, eliminating the risk of leakage, and having a simple process, which is convenient for batch processing and production.

Description

Technical Field

[0001] The present invention relates to the field of thermal management technology for foldable screen electronic terminals, and in particular to a bendable liquid-cooled heat dissipation module of unequal thickness. It also relates to a method for manufacturing a bendable liquid-cooled heat dissipation module of unequal thickness, and a foldable screen terminal comprising the above-mentioned bendable liquid-cooled heat dissipation module of unequal thickness. Background Art

[0002] Application number CN202211070393.4 discloses a bendable liquid cooling and heat dissipation module and a folding screen electronic terminal, which aims to solve the problem of fixed connection of the flow channel matrix under the screen by stacking and sealing multiple layers of polymer film materials and meeting the requirements of at least 100,000 bending tests. Among them, by reducing the thickness of the hinge part and / or the thickness of the bending part, specifically, the thickness of the hinge part and / or the thickness of the bending part is less than the thickness of the base. Alternatively, the thickness of the hinge part, the thickness of the bending part and the thickness of the base connecting section are all less than the thickness of the base main section, which is conducive to reducing the bending section modulus of the flow channel matrix during bending and unfolding, thereby reducing the bending stress, thereby reducing fatigue damage and improving the bending life. For example, a typical flow channel matrix is composed of three layers of film materials. The three layers of film materials are a middle film material and two layers of covering film materials. A guide groove is provided on the middle film material, and the two layers of covering film materials are respectively covered on both sides of the middle film material, so that the guide groove forms a closed flow path. Since the two-layer sealing membrane must be a functional membrane with water and oxygen barrier properties, unequal thickness treatment of the sealing membrane is likely to destroy the water and oxygen barrier properties of the membrane, causing water loss and failure of the flow channel matrix. Therefore, unequal thickness treatment is usually performed on the middle membrane.

[0003] At present, the conventional method for constructing the above-mentioned unequal thickness flow channel matrix is to perform hot pressing on the area corresponding to the hinge part and / or the bend part on the middle film material cut out from the commercially available uniform thickness film coil, or the area corresponding to the hinge part, the bend part and the base connection section, to achieve local thinning, and then use the stacking sealing method to seal the film material on both sides to close the flow path. However, the use of this hot pressing thinning method will cause irreversible degradation of the film material in the hot pressing area, which will seriously affect the bending life of the flow channel matrix after stacking and sealing. At the same time, the unequal thickness flow channel matrix has a height difference at the connection position where the thickness changes. The surfaces that need to be sealed intersect in space. The stacking sealing method is used for molding, which involves the sealing of multiple surfaces that intersect in space. This undoubtedly increases the requirements for sealing equipment and tooling, and will lead to an increase in cost. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problem that in the process of using a hot pressing process to achieve local thinning of the thickness of the middle film material in a flow channel matrix of unequal thickness composed of multiple layers of polymer film materials stacked and sealed, the film material in the hot pressing thinning area undergoes irreversible degradation, which seriously affects the bending life of the flow channel matrix after stacking and sealing. A flexible liquid-cooled heat dissipation module of unequal thickness is provided. In addition, a method for manufacturing a flexible liquid-cooled heat dissipation module of unequal thickness is provided, as well as a folding screen terminal including the above-mentioned flexible liquid-cooled heat dissipation module of unequal thickness.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a flexible liquid cooling heat dissipation module with unequal thickness, including a flow channel substrate with a flow channel film material and a panel film material, wherein the flow channel film material and the panel film material are both made of high molecular polymer;

[0006] The flow channel membrane material is formed by splicing at least two spaced thick sections and a thin section arranged between the two adjacent thick sections. The thick section and the thin section are both provided with flow guide grooves. The thickness h1 of the thick section is greater than the thickness h2 of the thin section. A splicing gap is formed between the end of the thin section and the end of the adjacent thick section.

[0007] The flow channel membrane material formed by splicing thick sections and thin sections with splicing gaps is stacked and sealed with the panel membrane material to cover the guide groove; the flow channel membrane material and the panel membrane material after being stacked and sealed are heat-melted and sealed at the two end positions of the splicing gap to form joints, thereby forming a flow channel matrix with a flow path passing through the thick section and the thin section between two adjacent thick sections. The overall thickness H1 of the flow channel matrix at the location of the thick section is greater than the overall thickness H2 at the location of the thin section, and the location of the flow channel matrix at the location of the two adjacent thick sections can be relatively rotated by bending at the location of the thin section;

[0008] The flow path is used for the flow of heat dissipation medium, and the joint portion is formed as a side wall of the flow path to prevent the heat dissipation medium in the flow path from leaking from the joint between the thick section and the thin section.

[0009] Furthermore, the areas at both ends of the splicing gap are respectively the bonding gaps, the height direction of the cross section of the splicing gap perpendicular to its extension direction is the thickness direction of the thick section and the thin section, the width direction of the cross section of the splicing gap perpendicular to its extension direction is the width direction of the bonding gap, and the width of the bonding gap is T1;

[0010] T1 is designed so that when the joint is formed by hot melting, the melt produced after the end of the thick section adjacent to the joining gap is heated and melted, or the melt produced after the ends of the thick section and the thin section adjacent to the joining gap are heated and melted, flows to the splicing gap to fill the joining gap area, so that the joint can be formed.

[0011] Furthermore, the width T1 of the bonding gap is:

[0012]

[0013] Among them, S1 is the effective contact area of the hot pressure head of the hot melt sealing machine relative to the thick section; S2 is the effective contact area of the hot pressure head of the hot melt sealing machine relative to the thin section; h3 is the thickness of the joint part; w1 is the length of the joint part along the extension direction of the splicing gap.

[0014] Furthermore, T1 is designed so that when the joint is formed by heat melting, the end of the thick section adjacent to the joint gap and the portion protruding from the thin section are melted by heat, and the melt generated flows to the splicing gap to fill the joint gap area, so as to form the joint; wherein, .

[0015] Furthermore, the thick section has partition ribs, which are spaced apart to form a guide groove; the thin section also has partition ribs, which are spaced apart to form a guide groove;

[0016] The ends of the spacer bars on the thin section and the ends of the spacer bars on the adjacent thick section are arranged opposite to each other at the splicing gap position, and the areas between the spacer bars on the thin section and the spacer bars on the thick section in the splicing gap are both formed into slits;

[0017] The height direction of the cross section of the splicing gap perpendicular to its extension direction is the thickness direction of the thick section and the thin section, and the width direction of the cross section of the splicing gap perpendicular to its extension direction is the width direction of the slit, and the width of the slit is T2;

[0018] T2 is designed so that the flow resistance that the heat dissipating medium in the guide groove on one side of the slit needs to overcome when flowing along the slit to the guide groove on the other side of the slit is greater than the flow resistance of the heat dissipating medium in the guide groove.

[0019] Furthermore, the width T2 of the slit is: .

[0020] The present invention also provides a method for manufacturing a bendable liquid cooling and heat dissipation module of unequal thickness, which is characterized by comprising the following steps:

[0021] S1. Obtain thick segments and thin segments each having a guide groove, arrange the required number of thick segments at intervals, and place a thin segment between two adjacent thick segments to splice the flow channel membrane material. A splicing gap is formed between the end of the thin segment and the end of the adjacent thick segment. The thickness h1 of the thick segment is greater than the thickness h2 of the thin segment.

[0022] The flow channel membrane material formed by splicing thick sections and thin sections with splicing gaps is stacked and sealed with the panel membrane material to cover the guide groove; the flow channel membrane material and the panel membrane material are both made of high molecular polymer;

[0023] S2. The flow channel membrane material and the panel membrane material that have been stacked and sealed are heat-fused and sealed at both ends of the joint gap to form joint portions, thereby forming a flow channel matrix having a flow path passing through a thick section and a thin section between two adjacent thick sections;

[0024] The overall thickness H1 of the flow channel matrix at the location of the thick section is greater than the overall thickness H2 at the location of the thin section, and the locations of the flow channel matrix at the locations of two adjacent thick sections can be relatively rotated by bending at the location of the thin section;

[0025] The flow path is used for the flow of heat dissipation medium, and the joint portion is formed as a side wall of the flow path to prevent the heat dissipation medium in the flow path from leaking from the joint between the thick section and the thin section.

[0026] Furthermore, in step S2, the hot pressure head of the hot melt sealing machine is used to act on the two end position areas of the splicing gap of the flow channel membrane material and the panel membrane material after they are stacked and sealed with each other. The two end position areas of the splicing gap are respectively the bonding gaps. The melt generated after the end of the thick section adjacent to the bonding gap is heated and melted, or the melt generated after the ends of the thick section and the thin section adjacent to the bonding gap are heated and melted, flows to the splicing gap to fill the bonding gap and form a joint.

[0027] Furthermore, the height direction of the cross section of the splicing gap perpendicular to its extension direction is the thickness direction of the thick section and the thin section, and the width direction of the cross section of the splicing gap perpendicular to its extension direction is the width direction. The width T1 of the combined gap in the width direction is:

[0028]

[0029] Among them, S1 is the effective contact area of the hot pressure head of the hot melt sealing machine relative to the thick section; S2 is the effective contact area of the hot pressure head of the hot melt sealing machine relative to the thin section; h3 is the thickness of the joint part; w1 is the length of the joint part along the extension direction of the splicing gap.

[0030] Furthermore, in step S2, the end of the thick section adjacent to the joining gap protruding relatively from the thin section is heated and melted, and the melt generated flows to the splicing gap to fill the joining gap area; wherein, .

[0031] Furthermore, in step S1, the thick section 201 has partition ribs 204, and the partition ribs 204 are spaced apart to form a guide groove 203; the thin section 202 also has partition ribs 204, and the partition ribs 204 are spaced apart to form a guide groove 203;

[0032] After a thin section is arranged between two adjacent thick sections to splice the flow channel membrane material, the ends of the ribs on the thin section and the ends of the ribs on the adjacent thick section are arranged opposite to each other at the splicing gap position, and the areas between the ribs on the thin section and the ribs on the thick section in the splicing gap are formed into slits;

[0033] The height direction of the cross section of the splicing gap perpendicular to its extension direction is the thickness direction of the thick section and the thin section, and the width direction of the cross section of the splicing gap perpendicular to its extension direction is the width direction of the slit, and the width of the slit is T2;

[0034] T2 is designed so that the flow resistance that the heat dissipating medium in the guide groove on one side of the slit needs to overcome when flowing along the slit to the guide groove on the other side of the slit is greater than the flow resistance of the heat dissipating medium in the guide groove.

[0035] The width T2 of the slit is: .

[0036] The present invention also provides a foldable screen terminal, comprising the above-mentioned bendable liquid-cooled heat dissipation module of unequal thickness.

[0037] The beneficial effects of the present invention are:

[0038] First, unlike conventional unequal-thickness flow channel substrates that are formed by hot-pressing and thinning to form unequal-thickness structures, the present invention directly uses thick and thin sections of different thicknesses to splice and then stack to form unequal-thickness flow channel substrates. This solves the problem of irreversible degradation of the film material in the hot-pressing area caused by the conventional unequal-thickness flow channel substrate thinning method, which seriously affects the bending life of the flow channel substrate after stacking and sealing. It is beneficial to improve the bending life of the flow channel substrate.

[0039] Secondly, because the flow channel membrane material is made of thick and thin sections, there is a height difference at the joint gap. If it is formed by a one-time sealing method, it involves sealing multiple intersecting surfaces in the space. This undoubtedly increases the requirements for sealing equipment and tooling, resulting in a significant increase in cost and greater process difficulty.

[0040] In the present invention, the flow channel membrane material and the panel membrane material constituting the flow channel matrix are first stacked and sealed. During this process, there is no need to consider the sealing at the splicing gap, so as to reduce the requirements for sealing equipment and tooling. Subsequently, the two end positions of the splicing gap are welded and sealed to form the joint parts to form a flow channel matrix with a flow path inside. Under the premise of ensuring that the flow state of the heat dissipation medium in the flow path is not affected, the sealing of the flow channel matrix is achieved efficiently and reliably, eliminating the risk of leakage. The process is simple and convenient for batch processing and production. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention will be further described below with reference to the accompanying drawings and examples.

[0042] Figure 1 Schematic diagram of a flow channel membrane material formed by splicing thick sections and thin sections with splicing gaps;

[0043] Figure 2 yes Figure 1 AA-direction cross-sectional view;

[0044] Figure 3 yes Figure 1 BB-direction cross-sectional view;

[0045] Figure 4 Schematic diagram of the top view of the flow channel matrix after stacking and sealing;

[0046] Figure 5 yes Figure 4 Schematic diagram of CC section;

[0047] Figure 6 yes Figure 4 DD-direction cross-sectional view;

[0048] Figure 7 Schematic top view of the flexible liquid cooling module of unequal thickness according to the present invention (the area defined by the two dotted lines indicates the location of the splicing gap, and the square dotted box indicates the location of the joint);

[0049] Figure 8 yes Figure 7 EE-direction cross-sectional view;

[0050] Figure 9 Schematic diagram of the joint portion of the flexible liquid cooling and heat dissipation module of unequal thickness in the present invention in a cross section parallel to both the width direction of the joining gap and the extension direction of the splicing gap;

[0051] Figure 10 It is a schematic main view of the bendable liquid cooling module of unequal thickness in the present invention.

[0052] In the figure: 1, flow channel substrate, 101, flow channel;

[0053] 2. Flow channel membrane material, 201, thick section, 202, thin section, 203, guide groove, 204, partition rib;

[0054] 3. Panel membrane material;

[0055] 4. Splicing gap, 4-1. Combination gap, 4-2. Slit;

[0056] 5. Joint;

[0057] h1, thickness of thick section;

[0058] h2, thickness of thin section;

[0059] h3, thickness of the joint

[0060] H1, the overall thickness of the flow channel matrix at the location of the thick section;

[0061] H2, the overall thickness of the flow channel matrix at the location of the thin section;

[0062] w1, the length of the joint along the extension direction of the splicing gap;

[0063] T1, the width of the bonding gap;

[0064] T2, the width of the slit. DETAILED DESCRIPTION

[0065] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating the basic structure of the present invention only in a schematic manner. They therefore only show components relevant to the present invention, and directions and references (e.g., up, down, left, right, etc.) may be used solely to facilitate the description of features in the drawings. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0066] Example 1

[0067] like Figure 1-10 As shown, a flexible liquid cooling module with unequal thickness includes a flow channel substrate 1 having a flow channel film material 2 and a panel film material 3, wherein the flow channel film material 2 and the panel film material 3 are both made of high molecular polymer;

[0068] like Figure 1 As shown, the flow channel membrane material 2 is formed by splicing at least two spaced thick sections 201 and a thin section 202 disposed between two adjacent thick sections 201. The thick section 201 and the thin section 202 are both provided with guide grooves 203. Figure 2 and 3 As shown, the thickness h1 of the thick section 201 is greater than the thickness h2 of the thin section 202 , and a splicing gap 4 is formed between the end of the thin section 202 and the end of the adjacent thick section 201 ;

[0069] like Figure 4-6 As shown, the flow channel membrane material 2 formed by splicing a thick section 201 and a thin section 202 with a splicing gap 4 is stacked and sealed with the panel membrane material 3 to cover the guide groove 203; the flow channel membrane material 2 and the panel membrane material 3 after being stacked and sealed with each other are heat-melted and sealed at the two end positions of the splicing gap 4 to form joint parts 5, thereby forming a flow channel base 1 with a flow path 101 passing through the thick section 201 and the thin section 202 between two adjacent thick sections 201, as shown Figure 7-10As shown, the overall thickness H1 of the flow channel substrate 1 at the location of the thick section 201 is greater than the overall thickness H2 at the location of the thin section 202, and the locations of the flow channel substrate 1 at the locations of two adjacent thick sections 201 can rotate relative to each other through the bending at the location of the thin section 202; the thickness of the flow channel substrate 1 can be 0.1mm~2mm, and the equivalent diameter of the flow channel 101 can be 10μm~1mm.

[0070] like Figure 9 As shown, the flow path 101 is used for the flow of heat dissipation medium, and the joint portion 5 is formed as a side wall of the flow path 101 to prevent the heat dissipation medium in the flow path 101 from leaking from the joint between the thick section 201 and the thin section 202.

[0071] The flow channel base 1 of the unequal thickness bendable liquid cooling heat dissipation module can be used in conjunction with a micro pump. For example, a heat dissipation medium is contained in the flow channel 101, and the micro pump is used to provide power for the flow of the heat dissipation medium so that the heat dissipation medium can flow from one thick section 201 to an adjacent thick section 201. The cooperation form of the flow channel 101 and the micro pump can specifically adopt the cooperation form of the flow channel 101 and the micro pump in the bendable liquid cooling heat dissipation module disclosed in application number CN202211070393.4;

[0072] Compared with the bendable liquid cooling heat dissipation module disclosed in application number CN202211070393.4, this unequal thickness bendable liquid cooling heat dissipation module has the following features:

[0073] The location of the runner base 1 at the location of the thick section 201 in the former is equivalent to the base in the latter embodiment 2, and the location of the runner base 1 at the location of the thin section 202 in the former is equivalent to the hinge portion and the bending portion in the latter embodiment 2, that is, the runner base 1 at the location of the thin section 202 can be bent around a predetermined axis, so as to allow the locations of the runner base 1 at the locations of two adjacent thick sections 201 to be able to rotate relative to each other around the predetermined axis through the bending at the location of the thin section 202; this is conducive to reducing the bending section modulus of the runner base 1 during the bending and unfolding process, thereby reducing the bending stress, thereby reducing fatigue damage and improving the bending life;

[0074] Alternatively, the former's middle channel matrix 1 located at the position of the thick section 201 is equivalent to the main section in the latter embodiment 3, and the former's middle channel matrix 1 located at the position of the thin section 202 is equivalent to the hinge part, bending part and connecting sections at both ends of the bending part in the latter embodiment 3.

[0075] It is worth noting that the panel film material 3 of the flow channel substrate 1 only needs to be able to cover the guide groove 203. It can be one layer, or two layers, or more than two layers, depending on the actual situation. For example, when the guide groove 203 on the flow channel membrane material 2 is a groove structure, a layer of panel film material 3 is laminated on the side of the flow channel membrane material 2 where the guide groove 203 is provided; when the guide groove 203 on the flow channel membrane material 2 is a through groove structure, a layer of panel film material 3 is required to be laminated on both sides of the flow channel membrane material 2.

[0076] The advantages of this embodiment are:

[0077] First, unlike the conventional hot-pressing thinning method for forming an unequal thickness structure of the flow channel substrate 1, this embodiment directly uses thick sections 201 and thin sections 202 of different thicknesses to splice, and then stack them to form a flow channel substrate 1 of unequal thickness, so as to solve the problem that the conventional hot-pressing thinning method for the flow channel substrate 1 of unequal thickness causes irreversible degradation of the film material in the hot-pressing area, which will seriously affect the bending life of the flow channel substrate 1 after stacking and sealing; it is beneficial to improve the bending life of the flow channel substrate 1.

[0078] Secondly, since the flow channel membrane material 2 is composed of a thick section 201 and a thin section 202, there is a height difference at the splicing gap 4. If a one-time sealing method is used for molding, it involves sealing multiple intersecting surfaces in the space, which undoubtedly increases the requirements for sealing equipment and tooling, resulting in a significant increase in cost and greater process difficulty.

[0079] In this embodiment, the flow channel membrane material 2 and the panel membrane material 3 constituting the flow channel base 1 are first laminated and sealed. During this process, there is no need to consider the sealing of the splicing gap 4 (in this case, there is a problem of leakage at the splicing gap 4), thereby reducing the requirements for sealing equipment and tooling. Subsequently, the two end areas of the splicing gap 4 are welded and sealed to form joint portions 5 to form the flow channel base 1 with the flow channel 101 inside. Under the premise of ensuring that the flow state of the heat dissipation medium in the flow channel 101 is not affected, the flow channel base 1 is sealed efficiently and reliably, eliminating the risk of leakage. The process is simple and convenient for mass production.

[0080] In order to achieve effective hot melt sealing, the two end positions of the splicing gap 4 need to meet certain requirements. As an example, the two end positions of the splicing gap 4 are respectively the bonding gap 4-1. The height direction of the cross section of the splicing gap 4 perpendicular to its extension direction is the thickness direction of the thick section 201 and the thin section 202. The width direction of the cross section of the splicing gap 4 perpendicular to its extension direction is the width direction of the bonding gap 4-1. The width of the bonding gap 4-1 is T1. Figure 5 As shown;

[0081] T1 is designed so that when the joint portion 5 is formed by hot melting, the melt generated after the end of the thick section 201 adjacent to the joining gap 4-1 is heated and melted, or the melt generated after the ends of the thick section 201 and the thin section 202 adjacent to the joining gap 4-1 are heated and melted, flows to the splicing gap 4 to fill the joining gap 4-1, so that the joint portion 5 can be formed.

[0082] Furthermore, the width T1 of the bonding gap 4-1 is:

[0083]

[0084] Among them, S1 is the effective contact area of the hot pressure head of the hot melt sealing machine relative to the thick section 201; S2 is the effective contact area of the hot pressure head of the hot melt sealing machine relative to the thin section 202; h3 is the thickness of the joint part 5; w1 is the length of the joint part 5 along the extension direction of the splicing gap 4.

[0085] When the bottom of the hot-melt sealing machine's hot pressure head acts on the flow channel base 1 to melt and form the joint portion 5, the thick section 201 is melted preferentially compared to the thin section 202. In the extreme case, at least the end portion of the thick section 201 adjacent to the joining gap 4-1 that protrudes from the thin section 202 is melted and the resulting melt flows toward the splicing gap 4 to fill the joining gap 4-1, thereby forming the joint portion 5. In this case:

[0086]

[0087] At this time, h3=h2, that is, after hot-melt suturing, the thickness of the joint portion 5 is equal to the overall thickness H2 at the location of the thin section 202 .

[0088] As an example, the thick section 201 has spacers 204, which are spaced apart to form a guide groove 203; the thin section 202 also has spacers 204, which are spaced apart to form a guide groove 203; the ends of the spacers 204 on the thin section 202 and the ends of the spacers 204 on the adjacent thick section 201 are arranged opposite to each other in the splicing gap 4, and the area between the spacers 204 on the thin section 202 and the spacers 204 on the thick section 201 in the splicing gap 4 is formed as a slit 4-2; the width of the slit 4-2 in the width direction of the combined gap 4-1 is T2; Figure 6 As shown;

[0089] T2 is designed so that the flow resistance that the heat dissipating medium in the guide groove 203 on one side of the slit 4-2 needs to overcome when flowing along the slit 4-2 to the guide groove 203 on the other side of the slit 4-2 is greater than or much greater than the flow resistance of the heat dissipating medium in the guide groove 203;

[0090] The two end positions of the flow channel base 1 relative to the splicing gap 4 have been hot-melt sealed to form a joint portion 5, which achieves effective sealing of the flow channel base 1 and can avoid leakage; and the area between the partition ribs 204 on the thin section 202 and the partition ribs 204 on the thick section 201 in the splicing gap 4 can be hot-melt sealed in the same way to separate adjacent flow paths 101, or hot-melt sealed can be omitted, because the size of the slit 4-2 can be controlled at a very small level by tooling and jigs. Therefore, the hydraulic diameter of the flow path 101 is several times, dozens of times or even hundreds of times the hydraulic diameter of the slit 4-2, and the flow resistance that the heat dissipation medium needs to overcome to form cross-flow between adjacent flow paths 101 through the slit 4-2 is greater than or much greater than the flow resistance that the heat dissipation medium needs to overcome to flow in the flow path 101. Therefore, even if the slits 4 - 2 between the guide grooves 203 of the flow channel base 1 are not heat-sealed, the flow state of the heat dissipating medium in the flow channel 101 will not be affected.

[0091] It is known that the thickness of the thick section 201 of the flow channel membrane material 2 is h1, the thickness of the thin section 202 is h2, and the width of the slit 4-2 is T2. When the slit 4-2 is not heat-sealed to avoid damage to the guide groove 203 and reduce costs, in order not to affect the flow state of the heat dissipation medium in the flow path 101, T2 needs to meet certain requirements. The circulation of the heat dissipation medium in the flow path 101 and the flow through the slit 4-2 can be regarded as the flow of the fluid in the rectangular cross-section flow channel. Therefore,

[0092] The resistance of the heat dissipation medium circulating in the flow path 101 It can be expressed as:

[0093]

[0094] Where: is the dynamic viscosity of the heat dissipation medium, is the width of the guide groove 203, is the length of the flow path 101;

[0095] Resistance of the heat sink flowing through slit 4-2 It can be expressed as:

[0096]

[0097] Where: It is the length of the slit 4-2 in the extending direction of the splicing gap 4 (the width of the partition rib 204 where the slit 4-2 is located).

[0098] satisfy:

[0099]

[0100] but:

[0101]

[0102] In the microchannel, , and in the bendable liquid cooling module there are generally ,but:

[0103]

[0104] In some embodiments, the thickness h2 of the thin section 202 spliced into the flow channel membrane 2 may be 0.1 mm, and the splicing gap T2 For example, T2 may be 0.01 mm. In this case, the narrow gap 4 - 2 between adjacent guide grooves 203 formed by the splicing gap T2 will not affect the flow state of the heat dissipation medium in the flow path 101 .

[0105] Example 2

[0106] A method for manufacturing a flexible liquid cooling heat dissipation module with unequal thickness, which may be, but is not limited to, an implementation of the unequal thickness structure of the flexible liquid cooling heat dissipation module disclosed in application number CN202211070393.4, comprises the following steps:

[0107] S1. Obtain thick sections 201 and thin sections 202, both of which have guide grooves 203. Arrange the required number of thick sections 201 at intervals. Dispose thin sections 202 between two adjacent thick sections 201 to splice the flow channel membrane material 2. A splicing gap 4 is formed between the end of the thin section 202 and the end of the adjacent thick section 201. The thickness h1 of the thick section 201 is greater than the thickness h2 of the thin section 202. Figure 1-3 As shown;

[0108] The thick section 201 and the thin section 202 with the splicing gap 4 are spliced together to form the flow channel membrane material 2 and the panel membrane material 3, and the guide groove 203 is covered. Figure 4-6 As shown; the materials of the flow channel membrane material 2 and the panel membrane material 3 are both high molecular polymers;

[0109] S2, the flow channel membrane material 2 and the panel membrane material 3 after being stacked and sealed are heat-melted and sealed at the two end positions of the splicing gap 4 to form joint parts 5, thereby forming a flow channel base 1 having a flow path 101 passing through the thick section 201 and the thin section 202 between two adjacent thick sections 201, as shown in FIG. Figure 7-10 As shown; when the two end areas of the splicing gap 4 are heat-melted and sealed, the heat-melted sealing area avoids the flow path 101 of the flow channel substrate 1;

[0110] The overall thickness H1 of the flow channel base body 1 at the location of the thick section 201 is greater than the overall thickness H2 at the location of the thin section 202, and the locations of the flow channel base body 1 at the locations of two adjacent thick sections 201 can be relatively rotated by bending at the location of the thin section 202;

[0111] The flow path 101 is used for the flow of heat dissipation medium. The joint portion 5 is formed as a side wall of the flow path 101 to prevent the heat dissipation medium in the flow path 101 from leaking from the joint between the thick section 201 and the thin section 202 .

[0112] In step S2, the hot press head of the hot melt sealing machine is used to act on the two end positions of the flow channel film material 2 and the panel film material 3 after being stacked and sealed with each other. The two end positions of the splicing gap 4 are respectively the bonding gaps 4-1, such as Figure 5 As shown; the melt generated after the end of the thick section 201 adjacent to the bonding gap 4-1 is heated and melted, or the melt generated after the end of the thick section 201 and the thin section 202 adjacent to the bonding gap 4-1 is heated and melted, flows to the splicing gap 4 to fill the bonding gap 4-1, forming a joint portion 5.

[0113] The height direction of the cross section of the splicing gap 4 perpendicular to its extension direction is the thickness direction of the thick section 201 and the thin section 202, and the width direction of the cross section of the splicing gap 4 perpendicular to its extension direction is the width direction. The width T1 of the combined gap 4-1 in the width direction is:

[0114]

[0115] Among them, S1 is the effective contact area of the hot pressure head of the hot melt sealing machine relative to the thick section 201; S2 is the effective contact area of the hot pressure head of the hot melt sealing machine relative to the thin section 202; h3 is the thickness of the joint part 5; w1 is the length of the joint part 5 along the extension direction of the splicing gap 4.

[0116] As an example, in step S2, the end of the thick section 201 adjacent to the bonding gap 4-1 protruding from the thin section 202 is heated and melted, and the melt flows to the splicing gap 4 to fill the bonding gap 4-1; wherein, .

[0117] As an example, in step S1, the thick section 201 has partition ribs 204, which are spaced apart to form the guide groove 203; the thin section 202 also has partition ribs 204, which are spaced apart to form the guide groove 203;

[0118] After the thin section 202 is arranged between two adjacent thick sections 201 to splice the flow channel membrane material 2, the ends of the partition ribs 204 on the thin section 202 and the ends of the partition ribs 204 on the adjacent thick section 201 are arranged opposite to each other in the splicing gap 4, and the area between the partition ribs 204 on the thin section 202 and the partition ribs 204 on the thick section 201 in the splicing gap 4 is formed into a slit 4-2, as shown in FIG. Figure 6 As shown; the height direction of the cross section of the splicing gap 4 perpendicular to its extension direction is the thickness direction of the thick section 201 and the thin section 202, and the width direction of the cross section of the splicing gap 4 perpendicular to its extension direction is the width direction of the slit 4-2, and the width of the slit 4-2 is T2;

[0119] T2 is designed so that the heat dissipating medium in the guide groove 203 on one side of the slit 4-2 needs to overcome a flow resistance greater than or much greater than the flow resistance of the heat dissipating medium in the guide groove 203 when flowing along the slit 4-2 to the guide groove 203 on the other side of the slit 4-2.

[0120] The width T2 of the slit 4-2 is: , the thickness h2 of the thin section 202 of the flow channel membrane material 2 can be 0.1 mm, then the splicing gap T2 For example, T2 may be 0.01 mm. In this case, the narrow gap 4 - 2 between adjacent guide grooves 203 formed by the splicing gap T2 will not affect the flow state of the heat dissipation medium in the flow path 101 .

[0121] The advantages of this embodiment are:

[0122] First, unlike the conventional hot-pressing thinning method for forming an unequal thickness structure of the flow channel substrate 1, this embodiment directly uses thick sections 201 and thin sections 202 of different thicknesses to splice, and then stack them to form a flow channel substrate 1 of unequal thickness, so as to solve the problem that the conventional hot-pressing thinning method for the flow channel substrate 1 of unequal thickness causes irreversible degradation of the film material in the hot-pressing area, which will seriously affect the bending life of the flow channel substrate 1 after stacking and sealing; it is beneficial to improve the bending life of the flow channel substrate 1.

[0123] Secondly, since the flow channel membrane material 2 is composed of a thick section 201 and a thin section 202, there is a height difference at the splicing gap 4. If a one-time sealing method is used for molding, it involves sealing multiple intersecting surfaces in the space, which undoubtedly increases the requirements for sealing equipment and tooling, resulting in a significant increase in cost and greater process difficulty.

[0124] In this embodiment, the flow channel membrane material 2 and the panel membrane material 3 constituting the flow channel matrix 1 are first stacked and sealed. In this process, there is no need to consider the sealing at the splicing gap 4. At this time, there is a problem of leakage at the splicing gap 4, so as to reduce the requirements for sealing equipment and tooling. Subsequently, the two end positions of the splicing gap 4 are welded and sealed to form a joint portion 5 to form a flow channel matrix 1 with a flow channel 101 inside. Under the premise of ensuring that the flow state of the heat dissipation medium in the flow channel 101 is not affected, the sealing of the flow channel matrix 1 is achieved efficiently and reliably, eliminating the risk of leakage. The process is simple and convenient for batch processing and production.

[0125] Example 3

[0126] A foldable screen terminal comprises a foldable screen and a heat dissipation module; the foldable screen has at least two screen segments, and adjacent two screen segments are hinged by a support hinge of the foldable screen; the heat dissipation module adopts the unequal thickness bendable liquid-cooled heat dissipation module of the above-mentioned embodiment 1, and the foldable screen has at least two screen segments, and adjacent two screen segments are hinged by a support hinge of the foldable screen. The foldable screen having two screen segments is used as an example for explanation, and the two screen segments are respectively a first screen segment and a second screen segment. The support hinge of the foldable screen hinges the first screen segment and the second screen segment, and a thick segment 201 of the flow channel base 1 is fixedly connected to the first screen segment, and another thick segment 201 is fixedly connected to the second screen segment. The rotation axis of the foldable screen support hinge is the above-mentioned predetermined axis.

[0127] The above description of the preferred embodiments of the present invention is intended to serve as a guide. Based on the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A flexible liquid cooling module with unequal thickness, characterized by: It comprises a flow channel substrate (1) having a flow channel membrane material (2) and a panel membrane material (3), wherein the flow channel membrane material (2) and the panel membrane material (3) are both made of high molecular polymers; The flow channel membrane (2) is formed by splicing at least two spaced thick sections (201) and a thin section (202) disposed between two adjacent thick sections (201); guide grooves (203) are disposed on both the thick section (201) and the thin section (202); the thickness h1 of the thick section (201) is greater than the thickness h2 of the thin section (202); and a splicing gap (4) is provided between the end of the thin section (202) and the end of the adjacent thick section (201); The flow channel membrane material (2) formed by splicing a thick section (201) and a thin section (202) with a splicing gap (4) is stacked and sealed with the panel membrane material (3) to cover the guide groove (203); the flow channel membrane material (2) and the panel membrane material (3) after being stacked and sealed are heat-melted and sealed at the two end positions of the splicing gap (4) to form joint parts (5), thereby forming a flow channel base (1) having a flow path (101) passing through the thick section (201) and the thin section (202) between two adjacent thick sections (201); the overall thickness H1 of the flow channel base (1) at the location of the thick section (201) is greater than the overall thickness H2 at the location of the thin section (202), and the location of the flow channel base (1) at the location of the two adjacent thick sections (201) can be relatively rotated by bending at the location of the thin section (202); The flow path (101) is used for the flow of heat dissipation medium, and the joint portion (5) is formed as a side wall of the flow path (101) to prevent the heat dissipation medium in the flow path (101) from leaking from the joint between the thick section (201) and the thin section (202).

2. The bendable liquid cooling module with unequal thickness according to claim 1, characterized in that: The two end positions of the splicing gap (4) are respectively the bonding gaps (4-1); the height direction of the cross section of the splicing gap (4) perpendicular to its extension direction is the thickness direction of the thick section (201) and the thin section (202); the width direction of the cross section of the splicing gap (4) perpendicular to its extension direction is the width direction of the bonding gap (4-1); and the width of the bonding gap (4-1) is T1; T1 is designed so that when the joint portion (5) is formed by heat melting, the melt generated by the end portion of the thick section (201) adjacent to the joining gap (4-1) is melted by heat, or the melt generated by the end portions of the thick section (201) and the thin section (202) adjacent to the joining gap (4-1) are melted by heat, flows to the splicing gap (4) to fill the joining gap (4-1), so as to form the joint portion (5).

3. The bendable liquid cooling module with unequal thickness according to claim 2, characterized in that: The width T1 of the bonding gap (4-1) is: Wherein, S1 is the effective contact area of the hot pressure head of the hot melt sealing machine relative to the thick section (201); S2 is the effective contact area of the hot pressure head of the hot melt sealing machine relative to the thin section (202); h3 is the thickness of the joint portion (5); and w1 is the length of the joint portion (5) along the extension direction of the splicing gap (4).

4. The bendable liquid cooling module with unequal thickness according to claim 3, characterized in that: T1 is designed such that when the joint portion (5) is formed by heat melting, the end portion of the thick section (201) adjacent to the joining gap (4-1) and the portion protruding from the thin section (202) are heated and melted, and the melt generated flows toward the splicing gap (4) to fill the joining gap (4-1), thereby forming the joint portion (5); wherein, .

5. The bendable liquid cooling module with unequal thickness according to claim 1, characterized in that: The thick section (201) has spacer ribs (204), and the spacer ribs (204) are spaced apart to form a guide groove (203); the thin section (202) also has spacer ribs (204), and the spacer ribs (204) are spaced apart to form a guide groove (203); The ends of the spacer ribs (204) on the thin section (202) and the ends of the spacer ribs (204) on the adjacent thick section (201) are arranged relative to each other at the splicing gap (4), and the areas between the spacer ribs (204) on the thin section (202) and the spacer ribs (204) on the thick section (201) in the splicing gap (4) are both formed as slits (4-2); The height direction of the cross section of the splicing gap (4) perpendicular to its extension direction is the thickness direction of the thick section (201) and the thin section (202), and the width direction of the cross section of the splicing gap (4) perpendicular to its extension direction is the width direction of the slit (4-2), and the width of the slit (4-2) is T2; T2 is designed so that the heat dissipating medium in the guide groove (203) on one side of the slit (4-2) needs to overcome a flow resistance that is greater than the flow resistance of the heat dissipating medium in the guide groove (203) when flowing along the slit (4-2) to the guide groove (203) on the other side of the slit (4-2).

6. The bendable liquid cooling module with unequal thickness according to claim 5, characterized in that: The width T2 of the slit (4-2) is: .

7. A method for manufacturing a flexible liquid cooling module with unequal thickness, characterized by: The following steps are involved: S1. Obtain a thick section (201) and a thin section (202) both having a guide groove (203), arrange a required number of thick sections (201) at intervals, arrange a thin section (202) between two adjacent thick sections (201) to splice a flow channel membrane material (2), a splicing gap (4) is formed between the end of the thin section (202) and the end of the adjacent thick section (201), and the thickness h1 of the thick section (201) is greater than the thickness h2 of the thin section (202); The flow channel membrane material (2) formed by splicing a thick section (201) and a thin section (202) with a splicing gap (4) is stacked and sealed with the panel membrane material (3) to cover the guide groove (203); the material of the flow channel membrane material (2) and the panel membrane material (3) are both high molecular polymers; S2, the flow channel membrane material (2) and the panel membrane material (3) that have been stacked and sealed are heat-melted and sealed at the two end positions of the splicing gap (4) to form joint portions (5), thereby forming a flow channel base body (1) having a flow path (101) passing through a thick section (201) and a thin section (202) between two adjacent thick sections (201); The overall thickness H1 of the flow channel base (1) at the location of the thick section (201) is greater than the overall thickness H2 at the location of the thin section (202), and the locations of the flow channel base (1) at the locations of two adjacent thick sections (201) can be relatively rotated by bending at the location of the thin section (202); The flow path (101) is used for the flow of heat dissipation medium, and the joint portion (5) is formed as a side wall of the flow path (101) to prevent the heat dissipation medium in the flow path (101) from leaking from the joint between the thick section (201) and the thin section (202).

8. The method for manufacturing a flexible liquid cooling and heat dissipation module with unequal thickness according to claim 7, wherein: In step S2, a hot press head of a hot melt sealing machine is used to act on the two end positions of the flow channel membrane material (2) and the panel membrane material (3) after being stacked and sealed with each other, and the two end positions of the splicing gap (4) are respectively the bonding gaps (4-1). The melt generated after the end of the thick section (201) adjacent to the bonding gap (4-1) is heated and melted, or the melt generated after the end of the thick section (201) and the thin section (202) adjacent to the bonding gap (4-1) are heated and melted, flows to the splicing gap (4) to fill the bonding gap (4-1), and forms a joint portion (5).

9. The method for manufacturing a flexible liquid cooling and heat dissipation module with unequal thickness according to claim 8, wherein: The height direction of the cross section of the splicing gap (4) perpendicular to its extension direction is the thickness direction of the thick section (201) and the thin section (202), and the width direction of the cross section of the splicing gap (4) perpendicular to its extension direction is the width direction of the bonding gap (4-1). The width T1 of the bonding gap (4-1) is: Wherein, S1 is the effective contact area of the hot pressure head of the hot melt sealing machine relative to the thick section (201); S2 is the effective contact area of the hot pressure head of the hot melt sealing machine relative to the thin section (202); h3 is the thickness of the joint portion (5); and w1 is the length of the joint portion (5) along the extension direction of the splicing gap (4).

10. The method for manufacturing a flexible liquid cooling and heat dissipation module with unequal thickness according to claim 9, characterized in that: In step S2, the end of the thick section (201) adjacent to the joining gap (4-1) and the portion protruding from the thin section (202) are heated and melted, and the melt generated flows toward the splicing gap (4) to fill the joining gap (4-1); wherein, .

11. The method for manufacturing a flexible liquid cooling and heat dissipation module with unequal thickness according to claim 7, wherein: The thick section (201) has spacer ribs (204), and the spacer ribs (204) are spaced apart to form a guide groove (203); the thin section (202) also has spacer ribs (204), and the spacer ribs (204) are spaced apart to form a guide groove (203); After a thin section (202) is arranged between two adjacent thick sections (201) to splice a flow channel membrane material (2), the end of the partition rib (204) on the thin section (202) and the end of the partition rib (204) on the adjacent thick section (201) are arranged relative to each other at the splicing gap (4), and the area between the partition rib (204) on the thin section (202) and the partition rib (204) on the thick section (201) in the splicing gap (4) is formed into a slit (4-2); The height direction of the cross section of the splicing gap (4) perpendicular to its extension direction is the thickness direction of the thick section (201) and the thin section (202), and the width direction of the cross section of the splicing gap (4) perpendicular to its extension direction is the width direction of the slit (4-2), and the width of the slit (4-2) is T2; T2 is designed so that the heat dissipating medium in the guide groove (203) on one side of the slit (4-2) needs to overcome a flow resistance that is greater than the flow resistance of the heat dissipating medium in the guide groove (203) when flowing along the slit (4-2) to the guide groove (203) on the other side of the slit (4-2).

12. The method for manufacturing a flexible liquid cooling and heat dissipation module with unequal thickness according to claim 11, characterized in that: The width T2 of the slit (4-2) is: .

13. A foldable screen terminal, characterized by: A bendable liquid cooling and heat dissipation module with unequal thickness comprising the one described in any one of claims 1-6.

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