Heat pipe, battery pack, and powered device

Abstract

The utility model discloses a kind of heat pipe, battery pack and electric device, it is related to battery pack technical field.Heat pipe is used for the heat management of battery pack, battery pack includes at least one electric core, heat pipe includes: evaporative section and condensing section, evaporative section is along first horizontal direction extension setting, evaporative section is located at the side of electric core to absorb heat;Condensing section is connected with evaporative section, condensing section is along second horizontal direction extension setting, condensing section is located at the other side of electric core to release heat;Wherein, first horizontal direction and second horizontal direction have included angle between them, and at least part of condensing section is higher than evaporative section.Heat pipe according to the utility model embodiment improves the heat dissipation efficiency of electric core two ends, help to balance battery pack overall temperature distribution.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, specifically to a heat pipe, a battery pack, and an electrical device. Background Technology

[0002] Currently, some battery packs employ a thermal management solution where a cold plate is bonded to the narrow face of the battery cell, using the cold plate to dissipate heat from the cell during charging. However, for blade batteries, the ends of the cell are prone to overheating during high-current fast charging. Due to the limited heat exchange capacity of the cold plate and the lack of independent cooling methods at both ends of the cell, heat dissipation cannot be timely and effective. Furthermore, the indiscriminate cooling of the cold plate makes it difficult to reduce the overall temperature difference of the battery pack, thus affecting the thermal management effect.

[0003] Therefore, there is room for improvement in the thermal management system of the battery pack. Utility Model Content

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, the first aspect of the present invention aims to provide a heat pipe for thermal management of a battery pack, thereby improving the heat dissipation efficiency at both ends of the battery cell and helping to balance the overall temperature distribution of the battery pack.

[0005] The second aspect of this invention aims to provide a battery pack having the aforementioned heat pipe.

[0006] The objective of the third aspect of this utility model is to provide an electrical device having the aforementioned battery pack.

[0007] A heat pipe according to a first aspect of the present invention is used for thermal management of a battery pack, the battery pack including at least one battery cell, the heat pipe including: an evaporation section and a condensation section, the evaporation section extending along a first horizontal direction and located on one side of the battery cell to absorb heat; the condensation section connected to the evaporation section extending along a second horizontal direction and located on the other side of the battery cell to release heat; wherein, there is an angle between the first horizontal direction and the second horizontal direction, and at least a portion of the condensation section is higher than the evaporation section.

[0008] According to the embodiment of the present invention, the heat pipe absorbs heat from the end of the battery cell using the evaporation section of the heat pipe, and dissipates the absorbed heat using the condensation section, thereby achieving rapid heat dissipation from the concentrated heat area of ​​the battery cell, thus improving the overall thermal management efficiency and temperature uniformity of the battery pack.

[0009] In some alternative embodiments, the condensation section is arranged to gradually extend upward in a direction away from the evaporation section.

[0010] Further optionally, the angle between the condensation section and the horizontal plane is θ, and the range of θ is 0° to 50°.

[0011] According to some optional embodiments of the present invention, the heat pipe further includes: a bent section connected between the evaporation section and the condensation section; the radius of the rounded corner of the bent section is R, satisfying 4mm≤R≤20mm.

[0012] In some alternative embodiments, the heat pipe further includes an insulating layer disposed on the evaporation section to insulate it from the connecting tabs of the battery cell.

[0013] Optionally, the insulating layer includes at least one of mica sheet, adhesive layer, and sprayed layer.

[0014] According to some optional embodiments of the present invention, the heat pipe further includes a thermally conductive buffer layer, which is provided at least on the condensation section.

[0015] According to some optional embodiments of the present invention, the heat pipe is a flat tube, the heat pipe has two opposite wide surfaces, and the wide surfaces are arranged vertically, and the heat pipe is connected to the battery cell through the wide surfaces.

[0016] Alternatively, the thickness of the heat pipe is 1 mm to 8 mm.

[0017] According to some optional embodiments of the present invention, the heat pipe is provided with a capillary cavity, and the wall thickness of the heat pipe in the capillary cavity ranges from 0.2 mm to 2 mm.

[0018] According to some optional embodiments of the present invention, the heat pipe is provided with a capillary cavity, which is arranged in the evaporation section and the condensation section, or the capillary cavity is arranged in the evaporation section.

[0019] A battery pack according to a second aspect of the present invention includes: a frame, wherein a horizontally arranged accommodating cavity is provided within the frame; a battery cell assembly, wherein the battery cell assembly is located within the accommodating cavity, the battery cell assembly includes at least one battery cell, each battery cell extending along a second horizontal direction, and at least one end of the battery cell is provided with a connecting piece; and a heat pipe according to a first aspect of the present invention, wherein the heat pipe is located within the accommodating cavity, the evaporation section of the heat pipe is located on one side of the battery cell assembly and connected to the connecting piece, the condensation section of the heat pipe is located on the other side of the battery cell assembly, and the condensation section is connected to the side of the battery cell or connected to the frame.

[0020] The electrical device according to a third aspect of the present invention is characterized in that it includes the battery pack described in the second aspect of the present invention.

[0021] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of the battery pack structure in some embodiments of the present invention;

[0024] Figure 2 This is a schematic diagram showing the arrangement of the battery cell and heat pipe in some embodiments of this utility model;

[0025] Figure 3 This is a schematic diagram showing the position of the insulating layer in some embodiments of this utility model;

[0026] Figure 4 This is a cross-sectional view of the battery pack in some embodiments of the present invention;

[0027] Figure 5 This is a schematic diagram of the heat pipe structure in some embodiments of this utility model;

[0028] Figure 6 This is a schematic diagram showing the angle between the condensation section and the horizontal plane in some embodiments of this utility model.

[0029] Figure label:

[0030] Battery pack 100

[0031] Frame 10, Receiving cavity 11

[0032] Battery cell assembly 20, battery cell 21, connecting piece 22,

[0033] Heat pipe 30, wide surface 301, evaporation section 32, condensation section 34, bending section 36, insulation layer 38. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0035] In the description of this utility model, it should be understood that the terms "thickness," "upper," "lower," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] It should be noted that, in the description of this application, "and / or" means including three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B.

[0038] The following is for reference. Figures 1-6 A heat pipe 30 according to an embodiment of the first aspect of the present invention is described.

[0039] like Figure 1 As shown, the heat pipe 30 according to an embodiment of the present invention is used for thermal management of a battery pack 100, the battery pack 100 including at least one battery cell 21.

[0040] As mentioned in the background section, during super-fast charging, the current density at the two ends of the battery cell 21 closest to the tabs is higher than that in the middle region, resulting in greater heat generation at both ends and a significant temperature difference. Simultaneously, the connecting piece 22 near the tabs generates considerable tab heat, affecting the lifespan of the battery cell 21. Currently, some battery packs 100 use potting compound to absorb heat for cooling, but due to its low thermal conductivity, the heat dissipation effect is limited, and injecting a large amount of potting compound into the entire pack increases the overall weight of the battery pack 100.

[0041] To address the aforementioned issues, this embodiment of the invention introduces a heat pipe 30 to dissipate the high heat generated near the end tab of the battery cell 21, thereby achieving heat dissipation in the high-heat area of ​​the battery pack 100 and improving the temperature uniformity and safety of the battery pack 100 during operation.

[0042] like Figure 1 and Figure 3 As shown, the heat pipe 30 includes an evaporation section 32 and a condensation section 34. A cooling medium is disposed within the heat pipe 30. The cooling medium absorbs heat from the battery cell 21 in the evaporation section 32 and releases heat in the condensation section 34. Optionally, the cooling medium can be water, liquid ammonia, methanol, ethanol, etc.

[0043] The evaporation section 32 extends along a first horizontal direction and is located on one side of the battery cell 21 to absorb heat. Specifically, the evaporation section 32 is positioned near the tab at the end of the battery cell 21, allowing for more direct heat absorption from that area. Here, the first direction aligns with the arrangement direction of the battery cells 21, and the evaporation section 32 extends along this direction and is located near the end tab, achieving unified absorption and conduction of heat from multiple battery cells 21. This expands the coverage of thermal management and improves the heat dissipation effect of the battery pack 100.

[0044] Of course, with proper design, the first direction can also be adjusted according to the actual heat-generating area of ​​the cell 21. The evaporation section 32 can be extended along the heat concentration area of ​​the cell 21 to specifically cover the high-heat area of ​​the cell 21, thereby achieving effective heat management of the cell 21 and improving the reliability of the battery pack 100.

[0045] The condensing section 34 is connected to the evaporating section 32. The condensing section 34 extends along the second horizontal direction and is located on the other side of the battery cell 21 to release heat.

[0046] The condensing section 34 is the heat release end of the heat pipe 30, which can export the heat transferred from the evaporating section 32 to achieve heat transfer.

[0047] Optionally, the condensation section 34 is located in the low-heat region of the battery pack 100. For example, the low-heat region of the battery pack 100 can be the cell 21 region located at the edge. This arrangement reduces the temperature at the end of the cell 21 on the one hand, and increases the temperature of the edge cells 21 on the other hand, thereby reducing the temperature difference of the cells 21 and the overall temperature difference of the battery pack 100, and improving the performance and service life of the battery pack 100.

[0048] Alternatively, the condensation section 34 can also be located at the frame 10 of the battery pack 100 to conduct the heat absorbed by the end of the cell 21 to the frame 10, thereby achieving efficient cooling and reducing the temperature difference of the entire pack.

[0049] There is an angle between the first horizontal direction and the second horizontal direction.

[0050] This design utilizes the space within the battery pack 100 to arrange the heat pipes 30. Furthermore, extending the evaporation section 32 and the condensation section 34 in different directions helps to create a more efficient heat transfer path and improve heat dissipation efficiency.

[0051] Combination Figures 2-4 In some optional embodiments, the evaporation section 32 is located at the end of the cell 21 where the tabs are located, while the condensation section 34 extends toward the side of the cell 21. This arrangement helps to absorb heat from the tab area and conduct heat to the side of the cell 21, reducing the temperature difference of the battery pack 100. In some more specific embodiments, such as Figure 5 As shown, the angle between the first horizontal direction and the second horizontal direction is 90°. This ensures smooth flow of the cooling medium at the corner of the heat pipe 30, reduces the flow resistance of the cooling medium, and improves the heat transfer efficiency of the heat pipe 30. It also makes the arrangement of the heat pipe 30 more suitable for the internal structure of the battery pack 100, optimizing space utilization.

[0052] Combination Figure 1 and Figure 2 At least part of the condensing section 34 is higher than the evaporating section 32, so as to use the height difference to form a gravitational effect, accelerate the return of the cooling working fluid to the evaporating section 32, improve the circulation efficiency of the cooling working fluid, and improve the heat dissipation effect.

[0053] According to some optional embodiments of the present invention, the heat pipe 30, such as Figure 4 As shown, the condensing section 34 extends gradually upward in the direction away from the evaporating section 32. In this way, the condensing section 34 is inclined upward, which is equivalent to forming a certain height difference, which is conducive to the smooth flow of the cooling medium inside the heat pipe 30, and at the same time promotes the return of the cooling medium to the evaporating section 32, thereby improving the circulation efficiency of the cooling medium inside the heat pipe 30.

[0054] In some alternative embodiments, such as Figure 6 As shown, the angle between the condensation section 34 and the horizontal plane is θ, and the range of θ is 0° to 50°.

[0055] For example, the angle θ between the condensation section 34 and the horizontal plane can be 5°, 10°, 20°, 30°, 45°, 50°, etc.

[0056] More optimally, the angle θ between the condensing section 34 and the horizontal plane is in the range of 10° to 30°, for example, the angle θ between the condensing section 34 and the horizontal plane is in the range of 10°, 15°, 20°, 25°, 30°, etc. Controlling the angle θ between the condensing section 34 and the horizontal plane to 10° to 30° here can ensure the return flow of the cooling medium and also make the heat pipe 30 adaptable to the installation environment within the battery pack 100, thereby improving the flexibility of the heat pipe 30 in use.

[0057] In some further optional embodiments, the heat pipe 30 also includes a bend 36 connecting the evaporation section 32 and the condensation section 34. The bend 36 provides a smooth flow path for the cooling medium between the evaporation section 32 and the condensation section 34. This allows the heat pipe 30 to adapt to the structure of the battery cell 21, thereby improving the fit between the heat pipe 30 and the battery cell 21 and enhancing heat dissipation efficiency.

[0058] Specifically, the bending section 36 is welded to the evaporation section 32 and the condensation section 34. Welding ensures the robustness of the heat pipe 30 structure and helps maintain the stability of the cooling medium circulation within the heat pipe 30. Simultaneously, the welding connection method also enhances the overall mechanical strength of the heat pipe 30, improving the reliability and durability of the battery pack 100 under certain vibration conditions.

[0059] The radius of the fillet of the bend 36 is R, which satisfies 4mm≤R≤20mm.

[0060] Specifically, the radius R of the bend 36 can be 4mm, 8mm, 10mm, 15mm, or 20mm. Setting the radius R of the bend 36 between 4mm and 20mm can reduce the space occupied by the heat pipe 30 in the battery pack 100, especially the space requirement at the corner, while ensuring the return efficiency of the cooling medium and guaranteeing the heat dissipation effect.

[0061] According to some optional embodiments of the present invention, such as Figure 3 As shown, the heat pipe 30 also includes an insulating layer 38, which is disposed on the evaporation section 32 to insulate it from the connecting piece 22 of the battery cell 21. The insulating layer 38 ensures the reliability of the battery pack 100.

[0062] In some specific embodiments, the insulating layer 38 includes at least one of mica sheet, adhesive layer, and sprayed layer.

[0063] When the insulating layer 38 is a mica sheet, it has good high-temperature resistance and insulation properties, making it suitable for achieving insulation between the connecting piece 22 of the battery cell 21 and the heat pipe 30. At the same time, the mica sheet can also provide some structural support, which helps to improve the stability of the evaporation section 32.

[0064] When the insulating layer 38 is an adhesive layer, the adhesive layer can be directly used to bond and fix the connecting piece 22 and the heat pipe 20, or the adhesive layer can also be used to fix the mica sheet or other insulating layer to the connecting piece 22 and / or the heat pipe 20, thereby improving the structural stability and providing a certain buffering and shock absorption effect.

[0065] When the insulating layer 38 is a sprayed layer, the sprayed layer can be directly sprayed onto the surface of the connecting piece 22 and / or the heat pipe 30 to achieve the insulation effect, while improving its structural adaptability to the surface of the connecting piece 22 and the heat pipe 30.

[0066] According to some further optional embodiments of the present invention, the heat pipe 30 further includes a thermally conductive buffer layer, which is provided at least on the condensation section 34.

[0067] The thermally conductive buffer layer facilitates heat dissipation from the condensation section 34, improving the heat dissipation efficiency of the heat pipe 30. Simultaneously, the thermally conductive buffer layer also provides a certain degree of mechanical cushioning, absorbing assembly errors and vibration stresses that may occur during battery pack 100 use. This enhances the adaptability and reliability of the heat pipe 30.

[0068] According to some optional embodiments of the present invention, the heat pipe 30, such as Figure 1 and Figure 2 As shown, the heat pipe 30 is a flat tube with two opposite wide surfaces 301, which are arranged vertically. The heat pipe 30 is connected to the battery cell 21 through the wide surfaces 301.

[0069] The flat tube can increase the contact area between the heat pipe 30 and the battery cell 21, improve the heat transfer efficiency, and allow the heat generated by the battery cell 21 to be more evenly and quickly introduced into the heat pipe 30, thereby enhancing the overall thermal management effect.

[0070] In some optional embodiments, the area of ​​the heat pipe 30 covering the connecting piece 22 ranges from 30% to 100%, with a preferred range of 50% to 80%. This arrangement ensures the heat dissipation effect of the heat pipe 30 on the area of ​​the connecting piece 22 while avoiding unnecessary weight and space occupation due to excessive coverage, thus balancing heat dissipation performance and lightweight requirements.

[0071] Specifically, the thickness of the heat pipe 30 can be 1mm to 8mm. For example, the thickness of the heat pipe 30 can be 1mm, 3mm, 5mm, 7mm, 8mm, etc. Controlling the thickness of the heat pipe 30 to 1mm to 8mm ensures that there is sufficient space inside the heat pipe 30 to fill the cooling medium, ensuring its heat transfer capacity and heat dissipation effect, while also facilitating the installation of the heat pipe 30 within the battery pack 100, balancing performance and installation. Preferably, the thickness of the heat pipe 30 is 1.5mm to 5mm. For example, the thickness of the heat pipe 30 can be 1.5mm, 2mm, 2.5mm, 3mm, 5mm, etc.

[0072] According to some optional heat pipes 30 of this utility model, the heat pipe 30 has a capillary cavity inside, and the wall thickness of the heat pipe 30 in the capillary cavity ranges from 0.2mm to 2mm. This ensures that the heat pipe 30 has a certain thinning rate while maintaining its pressure resistance, and at the same time avoids compressing the internal volume of the heat pipe 30, increasing the internal cavity volume, and ensuring the filling amount of the cooling working fluid.

[0073] For example, the wall thickness of the heat pipe 30 in the capillary cavity can be 0.2mm, 0.5mm, 1mm, 1.5mm, 2mm, etc.

[0074] Preferably, the wall thickness of the heat pipe 30 in the capillary cavity ranges from 0.3 mm to 1 mm. Here, the wall thickness of the heat pipe 30 in the capillary cavity can be 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, etc.

[0075] Specifically, the capillary cavity inside the heat pipe 30 can be one or a combination of several of the following: sintered capillary cavity, grooved capillary cavity, or wire mesh capillary cavity.

[0076] According to some optional heat pipes 30 of the present invention, the heat pipe 30 is provided with a capillary structure cavity, which is arranged in the evaporation section 32 and the condensation section 34, or the capillary structure cavity is arranged in the evaporation section 32.

[0077] In some technical solutions, the capillary cavity is simultaneously arranged in both the evaporation section 32 and the condensation section 34, which helps to improve the flow efficiency of the cooling medium and enhance the heat transfer capacity of the heat pipe 30. At the same time, this arrangement of the capillary cavity can improve the adaptability of the heat pipe 30 at various installation angles and ensure operational stability.

[0078] In some other technical solutions, the capillary cavity is arranged only in the evaporation section 32 to reduce the backflow resistance of the cooling medium in the heat pipe 30 and improve the circulation efficiency.

[0079] A battery pack 100 according to a second aspect embodiment of the present invention includes: a frame 10, a cell assembly 20, and a heat pipe 30. The frame 10 has a horizontally arranged receiving cavity 11. The cell assembly 20 is located within the receiving cavity 11 and includes at least one cell 21. Each cell 21 extends along a second horizontal direction, and at least one end of the cell 21 has a connecting piece 22. The heat pipe 30 is located within the receiving cavity 11. The evaporation section 32 of the heat pipe 30 is located on one side of the cell assembly 20 and connected to the connecting piece 22. The condensation section 34 of the heat pipe 30 is located on the other side of the cell assembly 20 and is connected to the side of the cell 21 or to the frame 10. Here, the condensation section 34 can dissipate heat to the side of the cell 21 to improve the temperature uniformity of the battery pack 100. Alternatively, the condensation section 34 can be connected to the frame 10 to transfer heat to the frame 10, improving the heat dissipation effect.

[0080] According to the embodiment of the present invention, the battery pack 100 utilizes an improved heat pipe 30, which enables the battery pack 100 to specifically absorb the concentrated heat generated at the end of the cell 21, especially in the area of ​​the connecting piece 22, thereby improving the thermal management capability of the battery pack 100.

[0081] The electrical device according to a third aspect of the present invention includes a battery pack 100 according to a second aspect of the present invention.

[0082] It is worth noting that the electrical device can be a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. The vehicle is equipped with a battery pack 100. Here, the battery pack 100 is used to power the vehicle.

[0083] The improved battery pack 100 facilitates better reliability of electrical devices.

[0084] The following is for reference. Figure 1 - Figure 6 The battery pack 100 according to an embodiment of the present invention is described in detail with reference to a specific example. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the invention.

[0085] Reference Figure 1 The battery pack 100 includes: a frame 10, a cell assembly 20, and a heat pipe 30.

[0086] The frame 10 has a horizontally arranged receiving cavity 11.

[0087] The battery cell assembly 20 is located within the accommodating cavity 11. The battery cell assembly 20 includes at least one battery cell 21, each battery cell 21 extending along a second horizontal direction, and at least one end of the battery cell 21 is provided with a connecting piece 22.

[0088] The heat pipe 30 is located inside the accommodating cavity 11. The heat pipe 30 is a flat tube with two opposite wide surfaces 301, which are vertically arranged. The heat pipe 30 is connected to the battery cell 21 through the wide surfaces 301.

[0089] The thickness of heat pipe 30 is 1mm to 8mm.

[0090] Reference Figures 2-3 and Figure 5 The heat pipe 30 includes: an evaporation section 32, a condensation section 34, a bending section 36, an insulation layer 38, and a thermally conductive buffer layer.

[0091] The evaporation section 32 extends along the first horizontal direction and is located on one side of the battery cell 21 and close to the connecting piece 22 to absorb heat.

[0092] Reference Figure 4 and Figure 6 The condensing section 34 is connected to the evaporating section 32, and the condensing section 34 gradually extends upward in the direction away from the evaporating section 32. The angle between the condensing section 34 and the horizontal plane is set to θ, and the range of θ is 0° to 50°.

[0093] The condensing section 34 extends along the second horizontal direction and is located on the other side of the battery cell 21 to dissipate heat. The condensing section 34 is connected to the side of the battery cell 21.

[0094] There is an angle between the first horizontal direction and the second horizontal direction, and at least a portion of the condensation section 34 is higher than the evaporation section 32.

[0095] The bent section 36 connects the evaporation section 32 and the condensation section 34.

[0096] The radius of the fillet of the bend 36 is R, which satisfies 4mm≤R≤20mm.

[0097] The heat pipe 30 has a capillary cavity inside, and the wall thickness of the heat pipe 30 in the capillary cavity ranges from 0.2 mm to 2 mm.

[0098] An insulating layer 38 is provided on the evaporation section 32 to insulate it from the connecting piece 22 of the cell 21.

[0099] A thermally conductive buffer layer is placed on the condensation section 34.

[0100] Other components of the battery pack 100 according to the present invention, such as the power supply device and its operation, are known to those skilled in the art and will not be described in detail here.

[0101] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0102] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A heat pipe, characterized in that, For thermal management of a battery pack, the battery pack including at least one battery cell, the heat pipe comprising: An evaporation section extends along a first horizontal direction and is located on one side of the battery cell to absorb heat. A condensing section is connected to the evaporating section and extends along a second horizontal direction. The condensing section is located on the other side of the battery cell to release heat. Wherein, there is an angle between the first horizontal direction and the second horizontal direction, and at least a portion of the condensation section is higher than the evaporation section.

2. The heat pipe according to claim 1, characterized in that, The condensation section extends gradually upward in a direction away from the evaporation section.

3. The heat pipe according to claim 2, characterized in that, The angle between the condensation section and the horizontal plane is θ, and the range of θ is 0° to 50°.

4. The heat pipe according to claim 1, characterized in that, The heat pipe further includes a bent section connecting the evaporation section and the condensation section; The radius of the rounded corner of the bent section is R, which satisfies 4mm≤R≤20mm.

5. The heat pipe according to claim 1, characterized in that, The heat pipe further includes an insulating layer disposed on the evaporation section to insulate it from the connecting piece of the battery cell.

6. The heat pipe according to claim 5, characterized in that, The insulating layer includes at least one of the following: mica sheet, adhesive layer, and spray coating layer.

7. The heat pipe according to claim 1, characterized in that, The heat pipe further includes a thermally conductive buffer layer, which is provided at least on the condensation section.

8. The heat pipe according to any one of claims 1-7, characterized in that, The heat pipe is a flat tube with two opposite wide surfaces, which are vertically arranged. The heat pipe is connected to the battery cell through the wide surfaces.

9. The heat pipe according to claim 8, characterized in that, The thickness of the heat pipe is 1mm to 8mm.

10. The heat pipe according to any one of claims 1-7, characterized in that, The heat pipe has a capillary cavity inside, and the wall thickness of the heat pipe in the capillary cavity ranges from 0.2 mm to 2 mm.

11. The heat pipe according to any one of claims 1-7, characterized in that, The heat pipe is provided with a capillary cavity, which is arranged in the evaporation section and the condensation section, or the capillary cavity is arranged in the evaporation section.

12. A battery pack, characterized in that, include: A frame, wherein a horizontally arranged receiving cavity is provided within the frame; A battery cell assembly located within the accommodating cavity, the battery cell assembly comprising at least one battery cell, each battery cell extending along a second horizontal direction, and at least one end of the battery cell having a connecting piece; According to any one of claims 1-11, the heat pipe is located within the accommodating cavity, the evaporation section of the heat pipe is located on one side of the battery cell assembly and connected to the connecting piece, the condensation section of the heat pipe is located on the other side of the battery cell assembly, and the condensation section is connected to the side of the battery cell or to the frame.

13. An electrical appliance, characterized in that, Includes the battery pack according to claim 12.

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