Heat exchange device, battery pack and electric equipment

Abstract

The application discloses a heat exchange device, a battery pack and an electric equipment, and belongs to the technical field of heat exchange. The heat exchange device comprises a flexible member and at least one rigid member, the flexible member and the rigid member are arranged in a stack, and the flexible member is in heat conduction connection with the rigid member. The flexible member has a medium flow channel, and the medium flow channel is used for conducting a heat exchange medium. The heat exchange device of the application has the medium flow channel made of the flexible member itself, does not need to be combined with the rigid member into the medium flow channel, and relies on the sealing property of the material of the flexible member to enhance the anti-leakage capability of the heat exchange device. In addition, compared with the all-metal heat exchange device, the heat exchange device of the application achieves the purpose of light weight.

Description

Technical Field

[0001] This application relates to the field of heat exchange technology, and more particularly to a heat exchange device, a battery pack, and an electrical appliance. Background Technology

[0002] Currently, most new energy vehicle battery packs are equipped with heat exchange devices, which often employ a composite design of flexible and metal components. However, the physical properties of these two materials differ, and stress can easily arise at the interface due to temperature fluctuations. Over long-term use, this stress will accumulate and may eventually lead to the failure of the heat exchange device's sealing performance, affecting the overall operational stability of the battery pack. Utility Model Content

[0003] This application provides a heat exchange device to solve the technical problem of easy failure of the sealing performance of the heat exchange device; another objective of this application is to provide a battery pack; yet another objective of this application is to provide an electrical device.

[0004] To achieve the above objectives, according to a first aspect of this application, a heat exchange device is provided, comprising: At least one rigid component; A flexible component is stacked on top of the rigid component, and the flexible component and the rigid component are thermally connected; the flexible component has a medium flow channel for conducting heat exchange medium.

[0005] Optionally, the flexible member has a plurality of protrusions and a plurality of recesses on the side opposite to the rigid member. Along the extension direction of the medium flow channel, the plurality of protrusions and the plurality of recesses are alternately arranged, and adjacent protrusions are connected to the recesses.

[0006] Optionally, along the extension direction of the medium flow channel, the maximum dimension of the connected protrusion and the concave is L1, satisfying 5mm≤L1≤20mm.

[0007] Optionally, the flexible member is bent along the extension direction of the medium flow channel, and the side of the flexible member facing the rigid member is in contact with the rigid member.

[0008] Optionally, the flexible member is provided with a plurality of first bends and a plurality of second bends. Along the extension direction of the medium flow channel, the plurality of first bends and the plurality of second bends are alternately arranged. Adjacent first bends and second bends are connected, and the bending directions of the first bends and the second bends are opposite. Along the extension direction of the medium flow channel, the maximum dimension of the first bend and the second bend that are connected is L2, which satisfies 60mm≤L2≤150mm.

[0009] Optionally, the width of the flow cross section of the medium flow channel is W, which satisfies 10mm≤W≤50mm.

[0010] Optionally, the flexible member has two first connecting pipes, both of which are connected to the medium flow channel; The rigid member has two second connecting pipes, which are sleeved outside the first connecting pipe.

[0011] According to a second aspect of this application, a battery pack is provided, comprising: Multiple battery modules; At least one of the above-mentioned heat exchange devices is attached to one side of the battery module.

[0012] According to a third aspect of this application, an electrical device is provided, including the aforementioned battery pack.

[0013] Several embodiments of this application have one of the following beneficial effects: The heat exchange device of this application includes a flexible component and at least one rigid component, which are stacked together and thermally connected. The flexible component has a medium flow channel for conducting the heat exchange medium. This application creates a medium flow channel for conducting the heat exchange medium within the flexible component itself, eliminating the need to combine it with the rigid component to form a medium flow channel. Relying on the sealing properties of the flexible component's own material, the leak-proof capability of the heat exchange device is enhanced. In addition, compared with all-metal heat exchange devices, this embodiment achieves the goal of lightweighting.

[0014] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0017] Figure 1 This is a schematic diagram of the overall structure of the heat exchange device provided in an exemplary embodiment of this disclosure; Figure 2 This is a cross-sectional view of the inlet and outlet of the heat exchange device provided in an exemplary embodiment of this disclosure; Figure 3 yes Figure 1Enlarged view of point A in the middle; Figure 4 yes Figure 1 Enlarged view at point B in the middle; Figure 5 This is a partial top view of the protrusions and recesses provided in an exemplary embodiment of this disclosure; Figure 6 This is a partial top view of the first and second bends provided in the exemplary embodiments of this disclosure; Figure 7 This is a comparison chart of simulated turbulent viscosity ratios for specific examples provided in the exemplary embodiments of this disclosure; Figure 8 This is a comparison chart of simulated convective heat transfer coefficients for specific examples provided in the exemplary embodiments of this disclosure; Figure 9 This is a simplified schematic diagram of a battery pack provided in an exemplary embodiment of this disclosure.

[0018] Explanation of reference numerals in the attached figures: 100 - Heat exchanger; 110 - Rigid component; 111 - Second connecting pipe; 120 - Flexible component; 121 - Medium flow channel; 122 - Protrusion; 123 - Recess; 124 - First bend; 125 - Second bend; 126 - First connecting pipe; 200-Battery Module. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0020] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a connection that allows communication; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements or an interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances. Furthermore, although the terms "first," "second," etc., may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Therefore, the first component discussed below may be referred to as the second component without departing from the teachings of this application. As used herein, the term "and / or" includes all combinations of any one and more of the associated listed items.

[0021] In the description of this application, "multiple" means two or more, and "at least one" means one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or nearly completely perpendicular, for example, an angle of 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or nearly completely parallel, for example, a perfectly parallel angle of 10° is considered parallel.

[0022] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure of this application, the components and arrangements of specific examples are described below. Of course, these are merely examples and are not intended to limit this application.

[0023] New energy vehicle battery packs are generally equipped with heat exchange devices, which often employ a composite design of flexible and metal components. However, the physical properties of the two materials differ, and stress can easily arise at the interface due to temperature fluctuations. Over long-term use, this stress will accumulate and may eventually lead to the failure of the heat exchange device's sealing performance, affecting the overall operational stability of the battery pack.

[0024] Currently, heat exchangers are made entirely of metal. This results in increased weight and affects the goal of lightweight design for vehicle range. The problem with non-metallic flexible components combined with metal components is that the flexible and metal components are combined by hot pressing or hot melting. Due to the different materials, the interface is prone to stress caused by temperature changes, which can lead to sealing failure over time.

[0025] According to the first aspect of this application, referring to Figure 1 and Figure 2 This disclosure provides a heat exchange device 100, which includes a flexible member 120 and at least one rigid member 110. The flexible member 120 and the rigid member 110 are stacked and thermally connected. The flexible member 120 has a medium flow channel 121 for conducting heat exchange medium.

[0026] It should be noted that the heat exchange device 100 is used to dissipate heat and heat the battery module 200 inside the battery pack. The principle of heat exchange device 100 dissipating heat from the battery module 200 is as follows: the heat exchange medium output from the heat exchange medium source enters the medium flow channel 121 through the inlet of the heat exchange device 100. After absorbing the heat generated by the battery module 200 during operation, the heat exchange medium flows out through the outlet of the heat exchange device 100, releasing the heat and completing the cooling and heat dissipation of the battery module 200.

[0027] The principle of the heat exchange device 100 heating the battery module 200 is as follows: the heat exchange medium output from the heat exchange medium source enters the medium flow channel 121 through the inlet of the heat exchange device 100, and the heat exchange medium transfers heat to the battery module 200. After heating the battery module 200, the heat exchange medium flows out through the outlet of the heat exchange device 100, thus completing the heating of the battery module 200.

[0028] It should be noted that the rigid component 110 is attached to one side of the battery module 200 in the height direction to conduct heat. At the same time, the rigid component 110 can also serve as a support structure for the battery module 200. The flexible component 120 is insufficient to support the battery module 200. The combination of the rigid component 110 and the flexible component 120 achieves support and heat exchange for the battery module 200.

[0029] Rigid component 110 is a metal component, which can be made of aluminum alloy cooling plate, such as 6061, 6063, or 5052 aluminum alloy. In some examples, the thickness of the metal component (the dimension of the metal component in the height direction of the battery pack) is between 0.5mm and 2mm. It is understood that the thickness of the metal component can be any value or a range between any two values ​​from 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, to 2mm. Specifically, it can be measured using external tools.

[0030] The flexible component 120 is disposed on the side of the rigid component 110 facing away from the battery module 200. The heat exchange medium in the medium flow channel 121 conducts heat exchange with the battery module 200 through the rigid component 110. The flexible component 120 can be made of TPU (Thermoplastic Polyurethane), high-performance PEEK (Polyether Ether Ketone), PI (Polyimide), etc., to ensure a pressure resistance of 1 MPa. It can be made of a 0.05 mm film or a film of 0.1 mm or thicker. It can also be reinforced with nano-reinforcing materials such as silica or carbon fiber for tear resistance.

[0031] It should be noted that the flexible part 120 and the rigid part 110 are joined by bonding, hot pressing or hot melting, as long as the flexible part 120 and the rigid part 110 can fit together.

[0032] To improve adhesion, the surface of rigid component 110 needs improvement, including increasing specific surface area, removing the oxide layer, cleaning, sandblasting, etching, and then phosphating the wall surface. A chromium-free passivation treatment forms a conversion coating, improving compatibility with the adhesive. Plasma treatment can also be used to increase surface energy, thus enhancing overall adhesion. If the flexible component 120 has poor adhesion, a primer can be applied to its surface to improve its surface energy. Suitable adhesive types include Chemlock-218, Chemlock-219 primer combined with Chemlock-213 topcoat, Cilbond series, and Thixon 422 series.

[0033] As can be seen from the above technical solution, this embodiment creates a medium flow channel 121 for conducting the heat exchange medium within the flexible component 120 itself, eliminating the need to combine it with the rigid component 110 to form the medium flow channel 121. Relying on the sealing properties of the flexible component 120's own material, the leak-proof capability of the heat exchange device 100 is enhanced. Furthermore, compared to an all-metal heat exchange device 100, this embodiment achieves the goal of weight reduction.

[0034] In some embodiments, refer to Figure 1 , Figure 3 and Figure 5 The flexible member 120 has a plurality of protrusions 122 and a plurality of recesses 123 on the side opposite to the rigid member 110. Along the extension direction of the medium flow channel 121, the plurality of protrusions 122 and the plurality of recesses 123 are alternately arranged, and adjacent protrusions 122 and recesses 123 are connected.

[0035] It should be noted that multiple protrusions 122 and multiple recesses 123 can be provided on any segment of the side of the flexible member 120 away from the rigid member 110, or multiple protrusions 122 and multiple recesses 123 can be provided on the entire side of the flexible member 120 away from the rigid member 110, or multiple non-continuous segments of the flexible member 120 away from the rigid member 110 can be provided with multiple protrusions 122 and multiple recesses 123.

[0036] It should be noted that the extension direction of the medium flow channel 121 refers to the extension direction of the heat exchange medium in any section of the medium flow channel 121.

[0037] Regarding the alternating arrangement of the aforementioned protrusions 122 and recesses 123, with adjacent protrusions 122 and recesses 123 connected, it is understood that when the flexible member 120 does not have a uniform arrangement of protrusions 122 and recesses 123 on its entire side away from the rigid member 110, at least one of the two sides of each protrusion 122 in the extension direction of the medium flow channel 121 is connected to a recess 123, and at least one of the two sides of each recess 123 in the extension direction of the medium flow channel 121 is connected to a recess 123. The protrusions 122 are connected; or, at least one of the two sides of each protrusion 122 in the extension direction of the medium flow channel 121 is connected to the recess 123, and each recess 123 is connected to the protrusion 122 on both sides in the extension direction of the medium flow channel 121; or, at least one of the two sides of each recess 123 in the extension direction of the medium flow channel 121 is connected to the protrusion 122, and each protrusion 122 is connected to the recess 123 on both sides in the extension direction of the medium flow channel 121. When a plurality of protrusions 122 and a plurality of recesses 123 are provided on the entire side of the flexible member 120 away from the rigid member 110, each protrusion 122 is connected to the recess 123 on both sides in the extension direction of the medium flow channel 121, and each recess 123 is connected to the protrusion 122 on both sides in the extension direction of the medium flow channel 121.

[0038] As can be seen from the above technical solution, by providing one or more sections or the entire side of the flexible component 120 opposite to the rigid component 110 with alternating protrusions 122 and concave portions 123, the problem of insufficient heat transfer capacity caused by the lower thermal conductivity of the flexible component 120 compared to the rigid component 110 can be compensated. Specifically, due to the curvature effect of the inner wall of the flexible component 120, Dean vortices can be generated in the medium flow channel 121 under certain conditions, causing changes in the velocity field and pressure field within the medium flow channel 121, which can enhance the heat transfer capacity. Further, it can be understood that the structure formed by the alternating arrangement of protrusions 122 and concave portions 123 disrupts the fluid boundary layer, causing intensified mixing at the fluid center and wall due to Dean vortices.

[0039] In some embodiments, refer to Figure 5 The maximum dimension of the connected protrusions 122 and concave portions 123 is L1, satisfying 5mm ≤ L1 ≤ 20mm. It should be noted that the maximum dimension L1 of the connected protrusions 122 and concave portions 123 refers to the dimension of any connected protrusion 122 and concave portion 123 in the extension direction of the corresponding medium flow channel 121. It can be understood that L1 can be any value from 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, and 20mm, or a range between any two values. Specifically, it can be obtained by measurement using external tools.

[0040] The radius of curvature of the protrusion 122 is R1 (not shown in the figure), satisfying 1.5mm ≤ R1 ≤ 6mm; the radius of curvature of the concave portion 123 is R2 (not shown in the figure), satisfying 1.5mm ≤ R2 ≤ 6mm. The radius of curvature of the protrusion 122 can be the same as that of the concave portion 123, or they can be configured differently; no specific limitation is made in this embodiment. It is understood that R1 can be any value among 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, and 6mm, or a range between any two values; specifically, it can be obtained by measurement using external tools. R2 can be any value among 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, and 6mm, or a range between any two values; specifically, it can be obtained by measurement using external tools.

[0041] In this embodiment, the height of the medium flow channel 121 at the protrusion 122 is H1 (not shown in the figure), and the height of the medium flow channel 121 at the recess 123 is H2 (not shown in the figure). It should be noted that the height of the medium flow channel 121 refers to the size of the medium flow channel 121 in the stacking direction of the rigid member 110 and the flexible member 120; the height H1 of the medium flow channel 121 at the protrusion 122 refers to the maximum size of the medium flow channel 121 in the stacking direction of the rigid member 110 and the flexible member 120, and the height H2 of the medium flow channel 121 at the recess 123 refers to the minimum size of the medium flow channel 121 in the stacking direction of the rigid member 110 and the flexible member 120. H1 and H2 satisfy 0.25≤H2 / H1≤0.8, 0.5≤R1 / H1≤2, and 0.5≤R2 / H1≤2.

[0042] This embodiment provides a basis for the formation of Dean's vortex within the medium flow channel 121 by defining the maximum dimension L1 between a connected protrusion 122 and a concave portion 123, the radius of curvature R1 of the protrusion 122, the radius of curvature R2 of the concave portion 123, the relationship between H1 and H2, the relationship between R1 and H1, and the relationship between R2 and H1.

[0043] In some embodiments, refer to Figure 1 , Figure 4 and Figure 6 The flexible member 120 is bent along the extension direction of the medium flow channel 121, and the side of the flexible member 120 facing the rigid member 110 is in contact with the rigid member 110. That is, some sections of the flexible member 120 can be bent, and the sections of the flexible member 120 with multiple protrusions 122 and multiple recesses 123 can also be bent.

[0044] Compared to the scheme that only sets multiple protrusions 122 and multiple recesses 123 to enhance the heat exchange capacity of the flexible member 120, this embodiment also has bending structures in other sections of the flexible member 120, which further improves the heat exchange capacity of the flexible member 120.

[0045] In some examples, refer to Figure 4 and Figure 6 The flexible member 120 is provided with a plurality of first bending portions 124 and a plurality of second bending portions 125. Along the extension direction of the medium flow channel 121, the plurality of first bending portions 124 and the plurality of second bending portions 125 are alternately arranged. Adjacent first bending portions 124 and second bending portions 125 are connected, and the bending directions of the first bending portions 124 and the second bending portions 125 are opposite.

[0046] It should be noted that multiple first bends 124 and multiple second bends 125 can be provided on any segment of the flexible component 120, with the multiple first bends 124 and multiple second bends 125 having a wavy structure. Alternatively, multiple first bends 124 and multiple second bends 125 can be provided on multiple segments of the flexible component 120, with the multiple first bends 124 and multiple second bends 125 having a wavy structure. Or, the entire flexible component 120 can be provided with multiple first bends 124 and multiple second bends 125, with the multiple first bends 124 and multiple second bends 125 having a wavy structure.

[0047] Regarding the alternating arrangement of the plurality of first bends 124 and the plurality of second bends 125, with adjacent first bends 124 and second bends 125 connected, it is understood that when a plurality of first bends 124 and a plurality of second bends 125 are provided on one or more sections of the flexible member 120, at least one of the two sides of each first bend 124 in the extension direction of the medium flow channel 121 is connected to a second bend 125, and at least one of the two sides of each second bend 125 in the extension direction of the medium flow channel 121 is connected to a first bend 125. The first bend 124 is connected to the second bend 125; or, at least one of the two sides of each first bend 124 in the extension direction of the medium flow channel 121 is connected to the second bend 125, and each second bend 125 is connected to the first bend 124 on both sides of the extension direction of the medium flow channel 121; or, at least one of the two sides of each second bend 125 in the extension direction of the medium flow channel 121 is connected to the first bend 124, and each first bend 124 is connected to the second bend 125 on both sides of the extension direction of the medium flow channel 121. When multiple first bends 124 and multiple second bends 125 are provided throughout the flexible member 120, each first bend 124 is connected to the second bend 125 on both sides of the extension direction of the medium flow channel 121, and each second bend 125 is connected to the first bend 124 on both sides of the extension direction of the medium flow channel 121.

[0048] As can be seen from the above technical solution, a portion or the entire flexible component 120 forms a wave-like structure that fits the rigid component 110. The wave-like structure, combined with the arrangement of multiple protrusions 122 and multiple recesses 123, further improves the heat exchange capacity of the flexible component 120.

[0049] It should be noted that, referring to Figure 6The maximum dimension L2 of the connected first bend 124 and second bend 125 satisfies 60mm ≤ L2 ≤ 150mm. Specifically, the maximum dimension L2 of the connected first bend 124 and second bend 125 refers to the dimension of any connected first bend 124 and second bend 125 in the extension direction of the corresponding medium flow channel 121. It can be understood that L2 can be any value or a range between any two values ​​from 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, 120mm, 125mm, 130mm, 135mm, 140mm, 145mm, to 150mm. Specifically, it can be obtained by measurement using external tools.

[0050] It should be noted that in this embodiment, the radius of curvature of the convex portion 122 is R3 (not shown in the figure), and the radius of curvature of the concave portion 123 is R4 (not shown in the figure). The radius of curvature of the convex portion 122 can be the same as that of the concave portion 123, or they can be configured differently. In this embodiment, no specific limitation is made. The relationship between R3 and L2 satisfies: 0.1≤R3 / L2≤0.25, and the relationship between R4 and L2 satisfies: 0.1≤R4 / L2≤0.25.

[0051] This embodiment provides a basis for the formation of Dean's vortex within the medium flow channel 121 by defining the maximum dimensions L2, the relationship between R3 and L2, and the relationship between R4 and L2 between a first bend 124 and a second bend 125 that are connected.

[0052] In some embodiments, refer to Figure 5 The width W of the flow cross-section of the medium flow channel 121 satisfies 10mm ≤ W ≤ 50mm. It can be understood that the width W of the flow cross-section of the medium flow channel 121 can be any value or a range between any two values ​​from 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, to 50mm. Specifically, it can be obtained by measurement using external tools.

[0053] It should be noted that, at the first bend 124, the width W of the flow cross-section of the medium flow channel 121 refers to the width of the flow cross-section at the first bend 124; at the second bend 125, the width W of the flow cross-section of the medium flow channel 121 refers to the width of the flow cross-section at the second bend 125; at the protrusion 122, the width W of the flow cross-section of the medium flow channel 121 refers to the width of the flow cross-section at the protrusion 122; at the recess 123, the width W of the flow cross-section of the medium flow channel 121 refers to the width of the flow cross-section at the recess 123; where the first bend is provided... In the portions 124 and 122, the width of the flow cross section at the first bend 124 is the same as the width of the flow cross section at the 122. Similarly, in the portion with the first bend 124 and the recess 123, the width of the flow cross section at the first bend 124 is the same as the width of the flow cross section at the recess 123. In the portion with the second bend 125 and 122, the width of the flow cross section at the second bend 125 is the same as the width of the flow cross section at the 122. The width of the flow cross section at the second bend 125 is the same as the width of the flow cross section at the 122.

[0054] It should be noted that, due to the influence of the first bend 124 and the second bend 125, the width W of the flow section of the medium flow channel 121 and the radius of curvature R3 of the protrusion 122 satisfy the following relationship: 0.2≤W / R3≤1; the width W of the flow section of the medium flow channel 121 and the radius of curvature R4 of the concave part 123 satisfy the following relationship: 0.2≤W / R4≤1.

[0055] This embodiment satisfies the design requirements of the medium flow channel 121 by limiting the flow cross section W, the relationship between W and / R3, and the relationship between W and R4, and at the same time provides better conditions for the formation of Dean vortex in the medium flow channel 121.

[0056] In a specific instance, refer to Figure 7 and Figure 8 Comparing the flow paths of the two specifications below, the flexible part 120 has a width W=11mm for the first bending part 124 and the second bending part 125, a flow channel height of 4mm, a curvature radius R3 of the protrusion 122 ranging from 15mm to 36mm (the curvature radius R4 of the concave part 123 is the same as R3), and a wavelength (i.e., the maximum dimension L2 between a connected first bending part 124 and a second bending part 125) of 75mm.

[0057] The straight pipe has a channel width W = 14 mm and a channel height of 4 mm; the inlet velocity is taken as 1 m / s. Simulation results show that the straight pipe exhibits laminar flow, while the bent pipe (referring to the section with the first bend 124 and the second bend 125) exhibits turbulent characteristics. Comparing the Turbulent Viscosity Ratio, the ratio for the bent pipe is between 3 and 11.575, with particularly pronounced turbulent characteristics at the tail end, demonstrating that Dean's eddies enhance turbulence, resulting in more intense turbulent pulsations. In contrast, the streamline index of the straight pipe is within 0.1 to 2, with very weak turbulent pulsations, essentially remaining in a laminar flow state. Comparing the heat transfer coefficients, the heat transfer coefficient of the bent pipe is more than double that of the straight pipe in some areas.

[0058] In some embodiments, refer to Figure 2 The flexible member 120 has two first connecting pipes 126, both of which are connected to the medium flow channel 121. The rigid member 110 has two second connecting pipes 111, which are sleeved on the outside of the first connecting pipes 126.

[0059] It should be noted that the second connecting pipe 111 is sleeved outside the first connecting pipe 126, providing support for the flexible first connecting pipe 126. One of the two first connecting pipes 126 serves as the inlet of the heat exchange medium, and the other first connecting pipe 126 serves as the outlet of the heat exchange medium.

[0060] In some embodiments, this heat exchange device can be prepared using the following methods and processes: By using water-soluble support materials such as PVA (Polyvinyl Acetate) or low-melting-point alloys and waxes as sacrificial materials, a male mold of a wave-shaped flow channel is made by high-precision 3D printing. The purpose is that the printed male mold will represent the cavity flow channel structure of the final product. Overmolding involves injecting TPU material into a mold using injection molding technology to completely encapsulate the sacrificial mold. After cooling, a solid TPU tube structure with an embedded sacrificial mold is obtained. Then the sacrificial mold of the TPU solid tube is removed by water dissolution: the TPU tube is immersed in warm water and the PVA will gradually dissolve and flow out to form a hollow flow channel waveform structure. If it is wax, it is directly heated to melt and discharge. For structural and thermal conductivity enhancement, nanofillers can be added to TPU. Carbon nanotubes and boron nitride particles are selected for thermal conductivity enhancement, while nanocellulose and modified nanosilica are selected for compressive strength enhancement. These are ultrasonically mixed with TPU solution to ensure uniform dispersion, and then injection molded. For solutions lacking complex waveform characteristics, co-extrusion stripping can also be used: The co-extrusion process uses one extruder to extrude TPU material and another to extrude sacrificial core material such as HDPE (High-Density Polyethylene) or PS (Polystyrene). The two materials are extruded simultaneously through a precision co-extrusion die to form a composite profile in which a TPU shell encapsulates a corrugated sacrificial core material. Cooling and shaping: The extruded composite profile is cured and shaped in a cooling water tank; The core material is then peeled off, and the solid sacrificial core material is extracted from the TPU tube using a traction device. To enhance thermal conductivity, a melt blending method can be used. The reinforced nanomaterials are blended and granulated with TPU granules through a twin-screw extruder to produce nanocomposite TPU masterbatch. The masterbatch is then used as a raw material for manufacturing.

[0061] Of course, the TPU flow channel structure and the metal bonding plane structure can also be designed separately and then welded together.

[0062] According to a second aspect of this disclosure, a battery pack is provided, with reference to... Figure 9 The battery pack includes multiple battery modules 200 and at least one heat exchange device 100 as described in any of the above embodiments. The heat exchange device 100 is attached to one side of a battery module 200 to facilitate heat exchange between the heat exchange device 100 and the battery module 200. The battery pack has all the beneficial effects of the aforementioned heat exchange device 100, which will not be elaborated further in this disclosure.

[0063] It should be noted that battery packs are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as in aerospace and other fields.

[0064] In some examples, the rigid member 110 of the heat exchange device 100 is attached to one side of the battery module 200, and the flexible member 120 is disposed on the side of the rigid member 110 away from the battery module 200. The rigid member 110 supports the battery module 200 and forms a thermal conductive relationship between the flexible member 120 and the battery module 200.

[0065] According to a third aspect of this disclosure, an electrical device is provided, which includes the battery pack in any of the above embodiments. This electrical device has all the beneficial effects of the heat exchange device 100 and the battery pack described above, which will not be repeated here. The electrical device can be an electric bicycle, electric motorcycle, electric car, etc.

[0066] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0067] The above provides a detailed description of a heat exchange device, battery pack, and electrical equipment provided in the embodiments of this application. Specific examples have been used in this application to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A heat exchange device (100), characterized in that, include: At least one rigid component (110); A flexible component (120) is stacked on top of the rigid component (110), and the flexible component (120) and the rigid component (110) are thermally connected; the flexible component (120) has a medium flow channel (121) for conducting heat exchange medium.

2. The heat exchange device (100) according to claim 1, characterized in that, The flexible member (120) has a plurality of protrusions (122) and a plurality of recesses (123) on the side away from the rigid member (110). Along the extension direction of the medium flow channel (121), the plurality of protrusions (122) and the plurality of recesses (123) are alternately arranged, and adjacent protrusions (122) and recesses (123) are connected.

3. The heat exchange device (100) according to claim 2, characterized in that, Along the extension direction of the medium flow channel (121), the maximum size of the connected protrusion (122) and the concave portion (123) is L1, which satisfies 5mm≤L1≤20mm.

4. The heat exchange device (100) according to any one of claims 1 to 3, characterized in that, The flexible member (120) is bent along the extension direction of the medium flow channel (121), and the side of the flexible member (120) facing the rigid member (110) is in contact with the rigid member (110).

5. The heat exchange device (100) according to claim 4, characterized in that, The flexible component (120) is provided with a plurality of first bends (124) and a plurality of second bends (125). Along the extension direction of the medium flow channel (121), the plurality of first bends (124) and the plurality of second bends (125) are alternately arranged. Adjacent first bends (124) and second bends (125) are connected, and the bending directions of the first bends (124) and the second bends (125) are opposite. Along the extension direction of the medium flow channel (121), the maximum dimension of the first bend (124) and the second bend (125) connected together is L2, which satisfies 60mm≤L2≤150mm.

6. The heat exchange device (100) according to claim 4, characterized in that, The width of the flow cross section of the medium flow channel (121) is W, which satisfies 10mm≤W≤50mm.

7. The heat exchange device (100) according to claim 4, characterized in that, The flexible component (120) has two first connecting pipes (126), both of which are connected to the medium flow channel (121); The rigid member (110) has two second connecting pipes (111), which are sleeved on the outside of the first connecting pipe (126).

8. A battery pack, characterized in that, include: Multiple battery modules (200); At least one heat exchange device (100) as described in any one of claims 1 to 7, wherein the heat exchange device (100) is attached to one side of the battery module (200).

9. The battery pack according to claim 8, characterized in that, The rigid member (110) of the heat exchange device (100) is attached to one side of the battery module (200), and the flexible member (120) is disposed on the side of the rigid member (110) away from the battery module (200).

10. An electrical appliance, characterized in that, Includes the battery pack as described in claim 9.

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