Vapor chamber, battery, and battery pack

Abstract

Disclosed in the present application are a vapor chamber, a battery, and a battery pack. The vapor chamber comprises a first plate, a second plate, and a plurality of protrusions, wherein the first plate is configured to be attached to at least one side face of a battery cell; the second plate is hermetically connected to the first plate to form a sealed space, the sealed space being filled with a liquid working medium; the plurality of protrusions are arranged between the first plate and the second plate, and are arranged in a dispersed manner within the sealed space; and in a first direction, the plurality of protrusions are sequentially arranged at intervals to form protrusion groups, protrusions in adjacent protrusion groups being at least partially staggered in the first direction.

Description

Heat sink, battery and battery pack

[0001] This application claims priority to Chinese Patent Application No. 202422709764.X, filed on November 6, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery heat dissipation technology, specifically to a heat spreader, a battery, and a battery pack. Background Technology

[0003] Lithium-ion batteries are widely used in new energy vehicles, especially pure electric vehicles, which require high energy density and high power density. However, both of these aspects pose serious challenges to the thermal management of large power battery packs. The current mainstream prismatic power cells use a bottom water-cooled plate for heat dissipation, which has limitations such as small heat dissipation area and large temperature difference between individual cells, making it difficult to meet the heat dissipation requirements of future cells with higher energy density and higher charge / discharge rates.

[0004] The temperature of the battery is balanced by setting a heat spreader, with copper pillars supporting the upper and lower copper sheets of the heat spreader. When heat is conducted from the heat source to the evaporation zone, the coolant in the cavity is heated in a low vacuum environment and begins to vaporize. At this time, it absorbs heat energy and expands rapidly in volume. The gaseous working fluid fills the entire cavity. When the gaseous working fluid comes into contact with a relatively cold area, condensation occurs. The heat accumulated during evaporation is released through the condensation phenomenon. The condensed coolant returns to the evaporation heat source through the capillary channels of the microstructure, thereby achieving the purpose of heat dissipation. Invention Overview

[0005] The gaseous cooling medium is unevenly dispersed within the cavity, with some areas having less gaseous cooling medium, which affects the heat dissipation effect. As a result, the battery pack still has a large temperature difference between individual cells.

[0006] Firstly, this application provides a heat spreader. It includes:

[0007] The first plate is configured to be attached to at least one side of the battery cell;

[0008] The second plate is sealed to the first plate to form a closed space, which is filled with liquid working fluid.

[0009] Multiple protrusions are disposed between the first plate and the second plate, dispersed in a closed space, and arranged sequentially at intervals along the first direction to form a protrusion group. The protrusions in adjacent protrusion groups are at least partially misaligned along the first direction.

[0010] Secondly, this application also provides a battery. The battery includes a heat spreader.

[0011] Thirdly, this application also provides a battery pack. The battery pack includes a battery. Beneficial effects

[0012] The heat spreader, battery, and battery pack provided in this application include a heat spreader comprising a first plate and a second plate, which are sealed together to form a closed space filled with a liquid working fluid. Multiple protrusions are provided between the first and second plates, dispersed within the closed space. These protrusions are spaced apart along a first direction to form protrusion groups. Adjacent protrusions within adjacent protrusion groups are at least partially offset along the first direction. The gap between the first and second plates between adjacent protrusion groups is relatively large, facilitating rapid flow of the gaseous cooling working fluid. The gap between the first and second plates is also relatively large, facilitating rapid flow of the gaseous cooling working fluid. The gaps are relatively large, allowing the gas-phase cooling medium to flow quickly between adjacent protrusions. Adjacent protrusions within adjacent protrusion groups are at least partially staggered along the first direction, causing the gas-phase cooling medium to disperse in different directions between adjacent protrusion groups, thus covering the entire heat spreader plane and improving the heat spreader's heat dissipation effect. This overcomes the problem of large temperature differences between individual cells in battery packs due to poor heat spreader heat dissipation in related technologies. Furthermore, the protrusions support the first and second plates, reducing the probability of damage to the heat spreader due to compression deformation. The heat spreader has good structural strength, enabling it to even out the temperature of individual cells and improving battery reliability. Attached Figure Description

[0013] Figure 1 is a first isometric view of a heat spreader provided in some implementations of this application.

[0014] Figure 2 is a second isometric view of a heat spreader provided in some implementations of this application.

[0015] Figure 3 is a diagram showing the heat spreader provided in some implementations of this application.

[0016] Figure 4 is a side sectional view of a heat spreader provided in some implementations of this application.

[0017] Figure 5 is a magnified view of part A in Figure 4.

[0018] Figure 6 is a magnified view of part B in Figure 4.

[0019] Figure 7 is a partial perspective view of the second plate of the heat spreader provided in some implementations of this application.

[0020] Figure 8 is an exploded view of a first form of battery provided by some implementations of this application.

[0021] Figure 9 is an exploded view of a second form of battery provided by some implementations of this application.

[0022] Figure 10 is an exploded view of a third form of battery provided by some implementations of this application.

[0023] Figure 11 is an exploded view of a fourth form of battery provided by some implementations of this application.

[0024] Figure 12 is an exploded view of a fifth form of battery provided by some implementations of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 100. Heat spreader; 110. First plate; 120. Second plate; 130. Sealed space; 140. Protrusion; 141. First protrusion; 142. Second protrusion; 143. First protrusion group; 144. Second protrusion group; 145. Protrusion group; 150. Flange; 160. Horizontal part; 170. Vertical part; 200. Battery cell; 300. Housing; 400. Cover plate. Embodiments of the present invention

[0027] Referring to Figures 1, 2, 4, 5, and 6, this embodiment of the application provides a heat spreader 100, including a first plate 110, a second plate 120, and a plurality of protrusions 140. The first plate 110 and the second plate 120 are made of metallic materials, such as copper, aluminum, stainless steel, or metal compounds. The first plate 110 is configured to adhere to at least one side of a battery cell 200. The second plate 120 is sealed to the first plate 110 to form a sealed space 130, which is filled with a liquid working fluid. The plurality of protrusions 140 are connected between the first plate 110 and the second plate 120. The plurality of protrusions 140 are dispersedly disposed within the sealed space 130. The sealed space 130 is provided with a capillary structure. Along a first direction, the plurality of protrusions 140 are sequentially spaced to form protrusion groups 145, and along a direction perpendicular to the first direction, the plurality of protrusion groups 145 are sequentially spaced. The protrusions 140 within adjacent protrusion groups 145 are at least partially offset along a first direction. The first direction can be the width direction of the heat spreader 100, the second direction is the length direction of the heat spreader 100, and the direction perpendicular to the first direction is the thickness direction of the heat spreader 100. The gap between the first plate 110 and the second plate 120 in the area where the protrusions 140 are not located is larger, which facilitates the flow of the gaseous cooling medium. While the gaseous cooling medium flows between adjacent protrusion groups 145, some of the cooling medium flows from the area between adjacent protrusions 140 within the protrusion group 145, and some of the gaseous cooling medium flows from the location of the protrusions 140.

[0028] In this embodiment, the gap between the first plate 110 and the second plate 120 between adjacent protrusion groups 145 is relatively large, resulting in a fast flow rate of the vapor-phase cooling medium and a good cooling effect. The vapor-phase cooling medium flows and diffuses from the area between adjacent protrusions 140 within the protrusion group 145. The protrusions 140 within adjacent protrusion groups 145 are at least partially offset along a first direction, allowing the vapor-phase cooling medium emanating from the area between adjacent protrusion groups 145 to diffuse and flow at different positions on both sides. This facilitates the vapor-phase cooling medium covering the entire heat spreader 100, improving the heat spreader effect of the heat spreader 100. Furthermore, the protrusions 140 support the first plate 110 and the second plate 120, reducing the probability of damage to the heat spreader 100 due to compression deformation, improving the structural strength of the heat spreader 100, and making it less prone to bulging, deformation, or collapse.

[0029] In some embodiments, along a direction perpendicular to the first direction, i.e., the second direction (the second direction is the thickness direction of the heat spreader 100), the projection of the protrusion 140 in the protrusion group 145 onto the adjacent protrusion group 145 is located in the region between two adjacent protrusions 140 in the adjacent protrusion group 145.

[0030] For example, along the first direction, a plurality of spaced-apart protrusions 140 are provided within the protrusion group 145, which are sequentially designated as the first protrusion, the second protrusion, ..., the nth protrusion. Along the second direction, a plurality of spaced-apart protrusions 140 are also provided, which are designated as the first protrusion group, the second protrusion group, ..., the nth protrusion group. The regions between the i-th protrusion of the i-th protrusion group and the i-th and i+1-th protrusions of the (i+1)-th protrusion group are positioned opposite each other. i and I are positive integers between 1 and n.

[0031] In this embodiment, a portion of the gaseous cooling medium flows between the i-th protrusion group and the i+1-th protrusion group, a portion of the cooling medium flows between the i-th protrusion and the i+1-th protrusion within the i-th protrusion group, and a portion of the cooling medium flows between the I-th protrusion and the I+1-th protrusion within the i+1-th protrusion group. The cooling medium flows alternately to both sides, resulting in a large flow range of the gaseous cooling medium, which is dispersed in a tree-like pattern and covers the entire heat spreader 100 plane, thereby improving the heat spreader effect of the heat spreader 100.

[0032] In some embodiments, along a direction perpendicular to the first direction, i.e., the second direction, the projection of the protrusion 140 in the protrusion group 145 onto the adjacent protrusion group 145 at least covers the area between two adjacent protrusions 140 of the adjacent protrusion group 145.

[0033] For example, along the first direction, a plurality of spaced-apart protrusions 140 are provided within the protrusion group 145, which are sequentially designated as the 1st protrusion, the 2nd protrusion, ..., the nth protrusion. Along the second direction, a plurality of spaced-apart protrusions 140 are also provided, designated as the 1st protrusion group, the 2nd protrusion group, ..., the nth protrusion group. One end of the i-th protrusion in the i-th protrusion group corresponds to the region of the I-th protrusion in the (i+1)-th protrusion group, and one end of the i-th protrusion in the i-th protrusion group corresponds to the region of the I+1-th protrusion in the (i+1)-th protrusion group. i and I are positive integers between 1 and n.

[0034] In this embodiment, a portion of the gaseous cooling medium flows between the i-th protrusion group and the i+1-th protrusion group, a portion of the cooling medium flows between the i-th protrusion and the i+1-th protrusion within the i-th protrusion group, and a portion of the cooling medium flows between the I-th protrusion and the I+1-th protrusion within the i+1-th protrusion group. The cooling medium flows alternately to both sides, resulting in a large flow range of the gaseous cooling medium, which is dispersed in a tree-like pattern and covers the entire plane of the heat spreader 100, thereby improving the heat spreader effect of the heat spreader 100.

[0035] In some embodiments, referring to Figures 1, 5, 6 and 7, the second plate 120 is recessed toward the first plate 110 to form a protrusion 140.

[0036] For example, the first plate 110 is a flat plate structure, and a protrusion 140 is disposed on the second plate 120. The second plate 120 is recessed towards the first plate 110 to form the protrusion 140. The first plate 110 has a large contact area with the battery cell 200, resulting in better heat dissipation. The second plate 120 is recessed to form the protrusion 140, and the second plate 120 and the protrusion 140 are an integral structure. The heat dissipation plate 100 is completed by assembling the second plate 120 and the first plate 110, and the processing technology is simple. The integral structure of the second plate 120 and the protrusion 140 provides good sealing performance.

[0037] In some embodiments, referring to Figures 3 and 7, the plurality of protrusions 140 include a plurality of first protrusions 141. In a top view, the first protrusions 141 are elongated and extend along a first direction. Along the first direction, the plurality of first protrusions 141 are spaced apart to form a first protrusion group 143. The plurality of first protrusion groups 143 are spaced apart along a direction perpendicular to the first direction. The first protrusions 141 of adjacent first protrusion groups are at least partially offset.

[0038] In this embodiment, the first protrusion 141 is elongated, with a large supporting area and good supporting effect. The elongated shape of the first protrusion 141 and the small spacing between the first protrusions 141 within the first protrusion group 143 facilitates increased flow velocity of the gaseous cooling medium in the area between adjacent first protrusion groups 143, thereby improving heat dissipation.

[0039] In some embodiments, the plurality of protrusions 140 further include a plurality of second protrusions 142, which are spaced apart along a first direction to form a second protrusion group 144. The second protrusion group 144 is located between two first protrusion groups 143. For example, a second protrusion group 144 is provided between all adjacent first protrusion groups 143. Alternatively, a second protrusion group 144 is provided between some adjacent first protrusion groups 143, and not between some adjacent first protrusion groups 143. The plurality of second protrusion groups 144 are spaced apart along a direction perpendicular to the first direction (i.e., a second direction). The second protrusions 142 of adjacent second protrusion groups 144 are at least partially offset. Exemplarily, adjacent second protrusions 142 within adjacent second protrusion groups 144 are staggered.

[0040] In this embodiment, a second protrusion group 144 is provided in the area between the two first protrusion groups 143. The second protrusion group 144 supports the first plate 110 and the second plate 120, improving the structural strength of the first plate 110 and the second plate 120 and reducing the probability of bulging or collapse deformation of the heat spreader 100. The channel between the second protrusion groups 144 facilitates the flow of gaseous cooling medium, disperses the gaseous cooling medium, and improves the heat spreader effect.

[0041] In some embodiments, referring to Figures 3 and 7, the second protrusion 142 has a different shape than the first protrusion 141.

[0042] In this embodiment, the multiple protrusions 140 include second protrusions 142 and first protrusions 141 of different shapes, which are reasonably distributed within the enclosed space 130 to make reasonable use of space and improve the support effect. The first protrusion 141 and the second protrusion 142 have different shapes, such as the first protrusion 141 being elongated and the second protrusion 142 being circular. The gaseous cooling medium flows quickly between the first protrusion group 143, and there are more lateral dispersion channels in the second protrusion group 144, which is conducive to the dispersion of the gaseous cooling medium in the plane and to covering the entire heat spreader 100. The first protrusion 141 and the second protrusion 142 take into account both the flow rate and dispersion requirements of the gaseous cooling medium, and also improve the support effect.

[0043] In some embodiments, referring to Figures 3 and 7, the second protrusion 142 is circular in shape.

[0044] In this embodiment, the first protrusion 141 is elongated, providing a large supporting area and good support. However, the first protrusion 141 occupies a large area and cannot cover a large area. A circular second protrusion 142 is distributed in the area between the first protrusions 141. The second protrusion 142, combined with the first protrusion 141, balances the flow rate and dispersion requirements of the gaseous cooling medium, resulting in a large coverage area, high structural strength, and good support.

[0045] In some embodiments, referring to FIG3, the interval between adjacent second protrusions 142 within the second protrusion group 144 is a, where a = 8 mm.

[0046] In some embodiments, referring to FIG3, the first protrusion 141 extends along the width direction of the second plate 120, and a plurality of first protrusions 141 are spaced apart to form a first protrusion group 143 along the width direction of the second plate 120, and a plurality of first protrusion groups 143 are spaced apart along the length direction of the second plate 120.

[0047] In this embodiment, the first protrusions 141 are arranged into a first protrusion group 143, which is neatly arranged and convenient for processing.

[0048] In some embodiments, referring to FIG3, the first protrusions 141 of adjacent first protrusion groups 143 are staggered along the length direction of the second plate 120. It can be understood that, along the length direction of the second plate 120, the projection of the first protrusion 141 of the first protrusion group 143 onto adjacent first protrusion groups 143 covers the opposite ends of adjacent first protrusions 141 within the first protrusion group 143. The first protrusion 141 has a wide support range and good support effect.

[0049] In some embodiments, the second protrusion group 144 includes a plurality of second protrusions 142, which are spaced apart along a first direction to form the second protrusion group 144. The plurality of second protrusion groups 144 are spaced apart along a direction perpendicular to the first direction. At least one first protrusion 141 is provided between adjacent second protrusion groups 144, and the first protrusion 141 extends along the first direction. By making reasonable use of the gaps between the second protrusion groups 144, the channels for the flow of the gaseous cooling medium are increased, which is beneficial to the flow of the gaseous cooling medium. This also increases the support range and improves the support effect.

[0050] In some embodiments, referring to FIG3, a plurality of second protrusions 142 are provided between the first protrusion group 143 and the edge of the second plate 120. The second protrusions 142 are provided between the end of the outermost first protrusion group 143 and the edge of the second plate 120. By reasonably arranging the second protrusions 142, the support range is increased and the support effect is improved.

[0051] In some embodiments, referring to FIG3, the length of the first protrusion 141 is L, wherein 10mm ≤ L ≤ 60mm. The value of L can be 10mm, 20mm, 30mm, 40mm, 45mm, 50mm, 60mm or other unlisted values. For example, the lengths of the first protrusions 141 located within the same first protrusion group 143 are different, or the lengths of the first protrusions 141 located within the same first protrusion group 143 are the same.

[0052] In some embodiments, referring to FIG3, the width of the first protrusion 141 is S, where 1.5mm ≤ S ≤ 6mm. The value of S can be 1.5mm, 2.0mm, 3.0mm, 4.0mm, 4.5mm, 5.0mm, 6.0mm, or other unlisted values. For example, all the first protrusions 141 have the same width, or the first protrusions 141 located in the same first protrusion group 143 have the same width, while the widths of the first protrusions 141 in different first protrusion groups 143 may be different.

[0053] In some embodiments, referring to FIG6, the height of the first protrusion 141 is H1, wherein 0.3mm ≤ H1 ≤ 0.6mm. The value of H1 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm or other unlisted values. For example, all the first protrusions 141 have the same height, or the first protrusions 141 located in the same first protrusion group 143 have the same height, and the first protrusions 141 located in different first protrusion groups 143 have different heights.

[0054] In some embodiments, referring to FIG3, the diameter of the second protrusion 142 is D, where D = 2.5 mm.

[0055] In some embodiments, referring to FIG6, the height of the second protrusion 142 is H2, wherein 0.3mm ≤ H2 ≤ 0.6mm. The value of H2 can be 0.3mm, 0.4mm, 0.45mm, 0.5mm, 0.6mm or other unlisted values. For example, all the second protrusions 142 have the same height, or the second protrusions 142 located in the same second protrusion group 144 have the same height, and the second protrusions 142 located in different second protrusion groups 144 have different heights.

[0056] In some embodiments, the ratio of the effective space within the enclosed space 130 to the enclosed space 130 is Q, where 0.6 ≤ Q ≤ 0.75. The value of Q can be 0.6, 0.65, 0.68, 0.72, 0.75, or other unlisted values. It is understood that the protrusion 140 occupies a certain space within the enclosed space 130, and the effective space refers to the volume of the enclosed space 130 minus the volume of the protrusion 140.

[0057] In this embodiment, the effective space setting of the enclosed space 130 is reasonable, which can meet the heat distribution requirements while taking into account the structural strength.

[0058] In some embodiments, the first plate 110 and the second plate 120 are stamped together. This facilitates the processing and forming of the first plate 110 and the second plate 120, and the processing technology is simple.

[0059] In some embodiments, referring to Figures 5 and 7, the peripheral edge of the second plate 120 is provided with a flange portion 150 protruding toward the first plate 110, and the flange portion 150 is welded to the first plate 110. This facilitates the assembly of the first plate 110 and the second plate 120.

[0060] In some embodiments, a portion of the first plate 110 and the second plate 120 at the location of the first protrusion 141 are welded together. The heat spreader 100 meets the baking requirements during the battery cell manufacturing process and is not prone to expansion. It also meets the compression requirements of the battery cell expansion on the heat spreader 100, and satisfies the gas-liquid transmission inside the heat spreader 100, thus realizing the function of the heat spreader 100.

[0061] In some embodiments, referring to Figures 1 and 2, the heat spreader 100 includes a horizontal portion 160 and a vertical portion 170, which are connected at an angle. The horizontal portion 160 is configured to be in contact with the bottom surface of the battery cell 200, and the vertical portion 170 is configured to be in contact with one side surface of the battery cell 200. The bending angle between the horizontal portion 160 and the vertical portion 170 is β, where 90°≤β≤100°. The heat spreader 100 has a horizontal portion 160 and a vertical portion 170. The horizontal portion 160 is in contact with the bottom of the battery cell 200, and the vertical portion 170 is in contact with the side surface of the battery cell 200. The large contact area between the heat spreader 100 and the battery cell 200 improves the heat dissipation effect.

[0062] Referring to Figures 8 to 11, this application embodiment provides a battery, including the aforementioned heat spreader 100 and battery cell 200, with the battery cell 200 attached to the first plate 110. The battery in this application embodiment has the same technical effects as the aforementioned heat spreader 100, and will not be described again.

[0063] Referring to Figures 8 to 11, the battery also includes a housing 300 and a cover plate 400. The cover plate 400 covers the housing 300 to form a receiving space, and the battery cell 200 and the heat spreader 100 are disposed within the receiving space. In some embodiments, two battery cells 200 are disposed within the housing 300.

[0064] In some embodiments, referring to Figures 8 and 9, a heat spreader 100 is provided, which is located between two battery cells 200.

[0065] In some embodiments, referring to FIG10, two heat spreaders 100 are provided between two battery cells 200, one heat spreader 100 is attached to one of the battery cells 200, and the other heat spreader 100 is attached to the other battery cell 200. The horizontal portions 160 of the two heat spreaders 100 are arranged facing away from each other.

[0066] In some embodiments, referring to FIG12, two heat spreaders 100 are provided, one heat spreader 100 is disposed on the outside of the battery cell 200, and the other heat spreader 100 is disposed between the two battery cells 200. The two heat spreaders 100 are arranged in parallel.

[0067] In some embodiments, referring to FIG11, two heat spreaders 100 are provided, one heat spreader 100 is provided on the outside of the battery cell 200, and the other heat spreader 100 is provided on the outside of another battery cell 200. The two heat spreaders 100 are arranged opposite to each other.

[0068] This application also provides a battery pack, including the battery described above. The battery of this application embodiment has the same technical effects as the heat spreader 100 described above, and will not be described again.

Claims

1. A heat spreader (100), comprising: The first plate (110) is configured to be attached to at least one side of the battery cell (200); The second plate (120) is sealed to the first plate (110) to form a closed space (130), and the closed space (130) is filled with a liquid working fluid. Multiple protrusions (140) are disposed between the first plate (110) and the second plate (120) and dispersed within the enclosed space (130). Along the first direction, the multiple protrusions (140) are sequentially spaced to form a protrusion group (145), and the protrusions (140) in adjacent protrusion groups (145) are at least partially misaligned along the first direction.

2. The heat spreader (100) according to claim 1, wherein, The second plate (120) is recessed toward the first plate (110) to form the protrusion (140).

3. The heat spreader (100) according to claim 1, wherein, Along a direction perpendicular to the first direction, the projection of the protrusion (140) in the protrusion group (145) onto the adjacent protrusion group (145) is located in the region between two adjacent protrusions (140) of the adjacent protrusion group (145).

4. The heat spreader (100) according to claim 1, wherein, Along a direction perpendicular to the first direction, the projection of the protrusion (140) within the protrusion group (145) onto the adjacent protrusion group (145) at least covers the area between two adjacent protrusions (140) of the adjacent protrusion group (145).

5. The heat spreader (100) according to claim 1, wherein, The plurality of protrusions (140) include a plurality of first protrusions (141) and a plurality of second protrusions (142), the plurality of second protrusions (142) are spaced apart along a first direction to form a second protrusion group (144), at least one first protrusion (141) is provided between adjacent second protrusion groups (144), and the first protrusion (141) extends along the first direction.

6. The heat spreader (100) according to claim 1, wherein, The plurality of protrusions (140) include a plurality of first protrusions (141). In a top view, the first protrusions (141) are elongated and extend in a first direction. In the first direction, the plurality of first protrusions (141) are spaced apart to form a first protrusion group (143). The first protrusions (141) of adjacent first protrusion groups (143) are at least partially misaligned.

7. The heat spreader (100) according to claim 6, wherein, The plurality of protrusions (140) further include a plurality of second protrusions (142). Along the first direction, the plurality of second protrusions (142) are spaced apart to form a second protrusion group (144). The second protrusion group (144) is located between two first protrusion groups (143). The second protrusions (142) of adjacent second protrusion groups (144) are at least partially misaligned.

8. The heat spreader (100) according to claim 7, wherein, The first protrusion (141) has a different shape from the second protrusion (142).

9. The heat spreader (100) according to claim 7, wherein, At least one second protrusion group (144) is disposed between the two first protrusion groups (143).

10. The heat spreader (100) according to claim 7, wherein, A plurality of second protrusions (142) are provided between the edge of the first protrusion group (143) and the edge of the second plate (120).

11. The heat spreader (100) according to any one of claims 6 to 10, wherein, From a top-down perspective, the second protrusion (142) is circular in shape.

12. The heat spreader (100) according to claim 11, wherein, The length of the first protrusion (141) is L, wherein 10mm≤L≤60mm; And / or, the width of the first protrusion (141) is S, 1.5mm≤S≤6mm; And / or, the height of the first protrusion (141) is H1, 0.3mm≤H1≤0.6mm; And / or, the diameter of the second protrusion (142) is D, where D = 2.5 mm; And / or, the height of the second protrusion (142) is H2, 0.3mm≤H2≤0.6mm.

13. The heat spreader (100) according to claim 11, wherein, The first plate (110) and the second plate (120) are welded at the location of the first protrusion (141); And / or, the four edges of the first plate (110) are welded to the four edges of the second plate (120).

14. The heat spreader (100) according to any one of claims 1 to 10, wherein, The peripheral edge of the second plate (120) is provided with a flange (150) protruding toward the first plate (110), and the flange (150) is welded to the first plate (110).

15. The heat spreader (100) according to any one of claims 1 to 10, wherein, The ratio of the effective space within the sealed space (130) to the sealed space (130) is Q, where 0.6 ≤ Q ≤ 0.

75.

16. A battery comprising: The heat spreader (100) as described in any one of claims 1 to 15; The battery cell (200) is attached to the first plate (110).

17. The battery according to claim 16, wherein, Two battery cells (200) and a heat spreader (100) are provided, with the heat spreader (100) located between the two battery cells (200); Alternatively, two battery cells (200) and two heat spreaders (100) are provided, with the two heat spreaders (100) disposed between the two battery cells (200), one heat spreader (100) being attached to one of the battery cells (200), and the other heat spreader (100) being attached to the other battery cell (200); Alternatively, two battery cells (200) and two heat spreaders (100) may be provided, with one heat spreader (100) located on the outside of the battery cell (200) and the other heat spreader (100) located between the two battery cells (200); Alternatively, two battery cells (200) and two heat spreaders (100) may be provided, with one heat spreader (100) located on the outside of the battery cell (200) and the other heat spreader (100) located on the outside of the other battery cell (200).

18. A battery pack, characterized in that, include: The battery as described in claim 16 or 17.

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