Vapor chamber, battery and battery pack

Abstract

The utility model discloses a vapor chamber, a battery and a battery pack, the vapor chamber comprises a first plate body, a second plate body and a plurality of protruding parts, the first plate body is used for being attached to at least one side face of a battery cell, the second plate body and the first plate body are in sealed connection to form a sealed space, and the sealed space is filled with a liquid working medium; the multiple protruding parts are arranged between the first plate body and the second plate body and arranged in the closed space in a dispersed mode, the multiple protruding parts are sequentially arranged at intervals in the first direction to form protruding sets, and the protruding parts in the adjacent protruding sets are at least partially arranged in a staggered mode in the first direction. According to the battery pack, the problem of large temperature difference of the single batteries due to poor soaking effect of the soaking plate in the existing battery pack is solved, the convex parts support the first plate body and the second plate body, the probability of damage of the soaking plate caused by extrusion deformation is reduced, the structural strength of the soaking plate is good, the temperature of the single batteries can be balanced, and the reliability of the batteries is improved.

Description

Technical Field

[0001] This application belongs to the field of battery heat dissipation technology, and particularly relates to a heat spreader, a battery, and a battery pack. Background Technology

[0002] 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.

[0003] The temperature of the battery is balanced by setting up a heat spreader, with copper pillars supporting the upper and lower copper sheets. When heat is conducted from the heat source to the evaporation zone, the coolant in the cavity, heated in a low-vacuum environment, begins to vaporize. This vapor absorbs heat and expands rapidly, filling the entire cavity with the vaporized working fluid. When the vaporized working fluid comes into contact with a relatively cool area, condensation occurs, releasing the heat accumulated during evaporation. The condensed coolant then returns to the evaporation heat source through the capillary channels of the microstructure, thus achieving heat dissipation. However, the vaporized cooling fluid is not evenly distributed within the cavity, with some areas having less vaporized cooling fluid, affecting the heat spreader effect and resulting in large temperature differences between individual cells within the battery pack. Utility Model Content

[0004] This application provides a heat spreader, a battery, and a battery pack to solve the problem of large temperature differences between individual cells in existing battery packs due to poor heat spreader performance.

[0005] In a first aspect, embodiments of this application provide a heat spreader, comprising:

[0006] The first plate is used to attach to at least one side of the battery cell;

[0007] The second plate is sealed to the first plate to form a closed space, which is filled with a liquid working fluid.

[0008] Multiple protrusions are disposed between the first plate and the second plate, and are dispersed within the enclosed space. Along the first direction, the multiple protrusions are arranged sequentially at intervals to form a protrusion group, and the protrusions in adjacent protrusion groups are at least partially misaligned along the first direction.

[0009] Optionally, the second plate is recessed toward the first plate to form the protrusion.

[0010] Optionally, along a direction perpendicular to the first direction, the projection of the protrusion within the protrusion group onto an adjacent protrusion group is located in the region between two adjacent protrusions in an adjacent protrusion group.

[0011] Optionally, along a direction perpendicular to the first direction, the projection of the protrusion within the protrusion group onto an adjacent protrusion group at least covers the area between two adjacent protrusions in the adjacent protrusion group.

[0012] Optionally, the plurality of protrusions include a plurality of first protrusions and a plurality of second protrusions, the plurality of second protrusions being spaced apart along a first direction to form a second protrusion group, at least one first protrusion being disposed between adjacent second protrusion groups, and the first protrusions extending along the first direction.

[0013] Optionally, the plurality of protrusions include a plurality of first protrusions. In a top view, the first protrusions are elongated and extend in a first direction. Along the first direction, the plurality of first protrusions are spaced apart to form the first protrusion group, and the first protrusions of adjacent first protrusion groups are at least partially misaligned.

[0014] Optionally, the plurality of protrusions further include a plurality of second protrusions. Along the first direction, the plurality of second protrusions are spaced apart to form a second protrusion group. The second protrusion group is located between two first protrusion groups, and the second protrusions of adjacent second protrusion groups are at least partially misaligned.

[0015] Optionally, the second protrusion has a different shape than the first protrusion.

[0016] Optionally, at least one second protrusion group is disposed between the two first protrusion groups.

[0017] Optionally, a plurality of second protrusions are provided between the first protrusion group and the edge of the second plate.

[0018] Optionally, the second protrusion is circular in shape when viewed from above.

[0019] Optionally, the length of the first protrusion is L, where 10mm≤L≤60mm;

[0020] And / or, the width of the first protrusion is S, wherein 1.5mm≤S≤6mm;

[0021] And / or, the height of the first protrusion is H1, wherein 0.3mm≤H1≤0.6mm;

[0022] And / or, the diameter of the second protrusion is D, where D = 2.5 mm;

[0023] And / or, the height of the second protrusion is H2, wherein 0.3mm≤H2≤0.6mm.

[0024] Optionally, a portion of the first plate and the second plate at the location of the first protrusion are welded together;

[0025] And / or, the four edges of the first plate are welded to the four edges of the second plate.

[0026] Optionally, the peripheral edge of the second plate is provided with a flange portion protruding toward the first plate portion, and the flange portion is welded to the first plate portion.

[0027] Optionally, the ratio of the effective space within the sealed space to the sealed space is Q, where 0.6 ≤ Q ≤ 0.75.

[0028] Secondly, embodiments of this application also provide a battery, comprising:

[0029] The heat spreader described above;

[0030] The battery cell is attached to the first plate.

[0031] Optionally, two battery cells and a heat spreader are provided, with the heat spreader located between the two battery cells;

[0032] Alternatively, two battery cells and two heat spreaders are provided, with the two heat spreaders disposed between the two battery cells, one heat spreader being attached to one of the battery cells and the other heat spreader being attached to the other battery cell;

[0033] Alternatively, two battery cells and two heat spreaders may be provided, with one heat spreader disposed on the outside of the battery cell and the other heat spreader disposed between the two battery cells;

[0034] Alternatively, two battery cells and two heat spreaders may be provided, with one heat spreader located on the outside of one battery cell and the other heat spreader located on the outside of the other battery cell.

[0035] Thirdly, embodiments of this application also provide a battery pack including the aforementioned battery.

[0036] The heat spreader, battery, and battery pack provided in this application embodiment 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, scattered 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 within the same protrusion group is also relatively large. The gaps between the bodies are relatively large, allowing the gaseous 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 gaseous 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 existing battery packs due to poor heat spreader heat dissipation. In addition, 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, can even out the temperature of individual cells, and improves battery reliability. Attached Figure Description

[0037] 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 accompanying 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.

[0038] 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. In the following description, the same reference numerals denote the same parts.

[0039] Figure 1 This is a first isometric view of a heat spreader provided in an embodiment of this application.

[0040] Figure 2 This is a second isometric view of a heat spreader provided in an embodiment of this application.

[0041] Figure 3 This is a diagram illustrating the heat spreader provided in an embodiment of this application.

[0042] Figure 4 This is a side sectional view of the heat spreader provided in an embodiment of this application.

[0043] Figure 5 for Figure 4 A magnified view of a portion of point A in the middle.

[0044] Figure 6 for Figure 4A magnified view of a section at point B in the middle.

[0045] Figure 7 A partial perspective view of the second plate of the heat spreader provided in an embodiment of this application.

[0046] Figure 8 An exploded view of a battery in the first form provided in an embodiment of this application.

[0047] Figure 9 An exploded view of a second form of battery provided in an embodiment of this application.

[0048] Figure 10 This is a third exploded view of the battery provided in the embodiments of this application.

[0049] Figure 11 This is a fourth exploded view of the battery provided in the embodiments of this application.

[0050] Figure 12 This is a fifth exploded view of the battery provided in the embodiments of this application.

[0051] The attached icon is labeled as follows:

[0052] 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. Detailed Implementation

[0053] 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 scope of protection of this application.

[0054] See Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6This 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 used 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 the first direction. The first direction can be the width direction of the heat spreader 100, and the second direction can be the length 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 provided is relatively large, 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 in the protrusion group 145, and some of the gaseous cooling medium flows from the location of the protrusions 140.

[0055] 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 plate, improving the heat spreader plate's heat distribution effect. Furthermore, the protrusions 140 support the first plate 110 and the second plate 120, reducing the probability of damage to the heat spreader plate 100 due to compression deformation, improving the structural strength of the heat spreader plate 100, and making it less prone to bulging and deformation.

[0056] 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 is located in the region between two adjacent protrusions 140 in the adjacent protrusion group 145.

[0057] 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.

[0058] 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 plane, thereby improving the heat spreader's heat dissipation effect.

[0059] 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.

[0060] 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.

[0061] 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 plane, thereby improving the heat spreader's heat dissipation effect.

[0062] In some embodiments, see Figure 1 , Figure 5 , Figure 6 and Figure 7 The second plate 120 is recessed towards the first plate 110 to form a protrusion 140.

[0063] 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.

[0064] In some embodiments, see Figure 3 and Figure 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.

[0065] 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.

[0066] 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. 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.

[0067] 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 heat spreader bulging. 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.

[0068] In some embodiments, see Figure 3 and Figure 7 The second protrusion 142 has a different shape than the first protrusion 141.

[0069] 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 efficient use of space and improve the support effect. The first protrusion 141 and the second protrusion 142 have different shapes; for example, the first protrusion 141 is elongated, while the second protrusion 142 is circular. The gaseous cooling medium flows quickly between the first protrusion group 143, and there are more lateral dispersion channels within the second protrusion group 144, which is conducive to the dispersion of the gaseous cooling medium in the plane and its coverage of the entire heat spreader. 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.

[0070] In some embodiments, see Figure 3 and Figure 7 The second protrusion 142 is circular in shape.

[0071] 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.

[0072] In some embodiments, see Figure 3 The interval between adjacent second protrusions 142 within the second protrusion group 144 is a, where a = 8 mm.

[0073] In some embodiments, see Figure 3 The first protrusion 141 extends along the width direction of the second plate 120. Along the width direction of the second plate 120, a plurality of first protrusions 141 are spaced apart to form a first protrusion group 143. Along the length direction of the second plate 120, a plurality of first protrusion groups 143 are spaced apart.

[0074] In this embodiment, the first protrusions 141 are arranged into a first protrusion group 143, which is neatly arranged and convenient for processing.

[0075] In some embodiments, see Figure 3Along the length of the second plate 120, the first protrusions 141 of adjacent first protrusion groups 143 are staggered. Understandably, along the length 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.

[0076] 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.

[0077] In some embodiments, see Figure 3 A plurality of second protrusions 142 are provided between the first protrusion group 143 and the edge of the second plate 120. A second protrusion 142 is provided between the end of the outermost first protrusion group 143 and the edge of the second plate 120. The reasonable arrangement of the second protrusions 142 increases the support range and improves the support effect.

[0078] In some embodiments, see Figure 3 The length of the first protrusion 141 is L, where 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 within the same first protrusion group 143 are different, or the lengths of the first protrusions 141 within the same first protrusion group 143 are the same.

[0079] In some embodiments, see Figure 3 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, 6mm, 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.

[0080] In some embodiments, see Figure 6The height of the first protrusion 141 is H1, where 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 within the same first protrusion group 143 have the same height, while the first protrusions 141 in different first protrusion groups 143 have different heights.

[0081] In some embodiments, see Figure 3 The diameter of the second protrusion 142 is D, where D = 2.5 mm.

[0082] In some embodiments, see Figure 6 The height of the second protrusion 142 is H2, where 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 within the same second protrusion group 144 have the same height, while the second protrusions 142 in different second protrusion groups 144 have different heights.

[0083] 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, or 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.

[0084] 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.

[0085] 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.

[0086] In some embodiments, see Figure 5 and Figure 7 The second plate 120 has a flange 150 protruding toward the first plate 110 along its peripheral edge, and the flange 150 is welded to the first plate 110. This facilitates the assembly of the first plate 110 and the second plate 120.

[0087] 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 meets the baking requirements during the battery cell manufacturing process and is not prone to expansion, meets the compression requirements of the battery cell expansion on the heat spreader, and also meets the gas-liquid transmission requirements inside the heat spreader, thus realizing the function of the heat spreader.

[0088] In some embodiments, see Figure 1 and Figure 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 used to adhere to the bottom surface of the battery cell 200, and the vertical portion 170 is used to adhere to one side 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 large contact area with the battery cell 200, improving the heat dissipation effect.

[0089] See Figures 8 to 11 This application provides a battery comprising the aforementioned heat spreader 100 and battery cell 200, wherein the battery cell 200 is 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.

[0090] See Figures 8 to 11 The battery also includes a housing 300 and a cover plate 400, the cover plate 400 covering the housing 300 to form a receiving space, and the battery cell 200 and the heat spreader 100 are disposed in the receiving space. In some embodiments, two battery cells 200 are disposed in the housing 300.

[0091] In some embodiments, see Figure 8 and Figure 9 A heat spreader 100 is set up between the two battery cells 200.

[0092] In some embodiments, see Figure 10 Two heat spreaders 100 are provided and positioned 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 positioned opposite each other.

[0093] In some embodiments, see Figure 12 Two heat spreaders 100 are provided, one of which is located on the outside of the battery cell 200, and the other is located between the two battery cells 200. The two heat spreaders 100 are arranged in parallel.

[0094] In some embodiments, see Figure 11 Two heat spreaders 100 are provided, one of which is located on the outside of the battery cell 200, and the other is located on the outside of another battery cell 200. The two heat spreaders 100 are positioned opposite each other.

[0095] 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.

[0096] 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.

[0097] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0098] The above provides a detailed description of the heat spreader, battery, and battery pack provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A heat spreader (100), characterized in that, include: A first plate (110) is used to attach 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 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, characterized in that, 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, characterized in that, 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) 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, characterized in that, Along a direction perpendicular to the first direction, the projection of the protrusion (140) within the protrusion group (145) onto an 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, characterized in that, 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 disposed between adjacent second protrusion groups (144). The first protrusion (141) extends along the first direction.

6. The heat spreader (100) according to claim 1, characterized in that, 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, characterized in that, 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, characterized in that, The first protrusion (141) has a different shape than the second protrusion (142).

9. The heat spreader (100) according to claim 7, characterized in that, 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, characterized in that, 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, characterized in that, From a top-down perspective, the second protrusion (142) is circular in shape.

12. The heat spreader (100) according to claim 11, characterized in that, The length of the first protrusion (141) is L, wherein 10mm≤L≤60mm; And / or, the width of the first protrusion (141) is S, wherein 1.5mm≤S≤6mm; And / or, the height of the first protrusion (141) is H1, wherein 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, wherein 0.3mm≤H2≤0.6mm.

13. The heat spreader (100) according to claim 11, characterized in that, 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, characterized in that, 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, characterized in that, 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, characterized in that, include: 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, characterized in that, 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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