Heat dissipation piece, battery device, vehicle and electric equipment

Abstract

The utility model discloses a heat dissipation part, a battery device, a vehicle and electric equipment. The heat dissipation part comprises a shell, a first structural part, a second structural part and a heat dissipation material, a closed containing cavity is formed in the shell, the first structural part, the second structural part and the heat dissipation material are all arranged in the containing cavity, the first structural part comprises a first containing part, the second structural part comprises a second containing part, an included angle exists between the first containing part and the second containing part, and the first structural part and the second structural part are stacked in the first direction. Therefore, the heat dissipation piece has good structural strength in the first direction, and when the battery unit close to the heat dissipation piece expands due to recycling or other reasons, the overall strength of the heat dissipation piece is improved through the holes in the two different directions, so that the heat dissipation piece adapts to expansion of the battery unit, and the risk of heat diffusion of the battery unit is reduced.

Description

Technical Field

[0001] This application relates to the field of heat dissipation components, and more specifically, to a heat dissipation component, a battery device, a vehicle, and electrical equipment. Background Technology

[0002] With the rapid increase in the number of new energy vehicles, electric vehicle fires still occur frequently, with a large proportion of these fires caused by thermal runaway of the power battery. Current technology typically places heat sinks or cooling components between battery cells to absorb heat and prevent thermal runaway and fire. However, battery cells expand during cyclic use, and conventional heat sinks or cooling components cannot accommodate this expansion. Utility Model Content

[0003] To address at least one problem existing in the prior art, this application provides a heat sink, a battery device, a vehicle, and an electrical appliance.

[0004] This application provides a heat dissipation component for a battery device, comprising: a housing, at least one first structural member, at least one second structural member, and a heat dissipation material; the housing forms a closed receiving cavity; the first structural member includes a plurality of first receiving portions, with at least one end of each first receiving portion penetrating through the first structural member along a first direction, and the first structural member being placed in the receiving cavity; the second structural member includes a plurality of second receiving portions, with at least one end of each second receiving portion penetrating through the second structural member along a second direction, and the second structural member being placed in the receiving cavity; the first structural member and the second structural member are stacked; the heat dissipation material is placed in the receiving cavity and / or the first receiving portion and / or the second receiving portion; the first direction and the second direction have an included angle.

[0005] In some embodiments, the first receiving portion has a cross-sectional shape that is either a regular hexagon or a regular quadrilateral in the direction perpendicular to the first direction.

[0006] In some embodiments, the second receiving portion has a cross-sectional shape that is either a regular hexagon or a regular quadrilateral perpendicular to the second direction.

[0007] In some embodiments, the heat dissipation component includes one first structural member and two second structural members, with the second structural members stacked at both ends of the first structural member along the first direction.

[0008] In some embodiments, the heat sink includes a plurality of first structural members and a plurality of second structural members, which are stacked along a first direction; in the first direction, at least a portion of the second structural members are disposed close to the housing relative to any one of the first structural members.

[0009] In some embodiments, a plurality of the first structural members are stacked along the first direction; and along the first direction, the second structural members are disposed at both ends of the stacked plurality of the first structural members.

[0010] In some embodiments, the first structural member includes a plurality of first support portions, which are fixedly connected to form the first receiving portion.

[0011] In some embodiments, the heat sink includes a plurality of first structural members, which are stacked along the first direction; in the first direction, a plurality of first support portions of one of two adjacent first structural members and a plurality of first support portions of the other partially overlap.

[0012] In some embodiments, in the first direction, at least a portion of the geometric center of the first receiving portion of one of two adjacent first structural members coincides with at least a portion of the first support portion of the other.

[0013] In some embodiments, a plurality of the first support portions are fixedly connected to form a first connection portion; in the first direction, the geometric center of the first receiving portion of one of two adjacent first structural members coincides with the first connection portion of the other.

[0014] In some embodiments, the heat sink further includes a first support member, which is fixedly connected to the first structural member and is located between the first structure and the outer casing.

[0015] In some embodiments, the first structural member includes a first end face disposed parallel to the first direction, and the first support member is fixedly connected to the first end face.

[0016] In some embodiments, the second structural member includes a plurality of second support portions, which are fixedly connected to form the second receiving portion.

[0017] In some embodiments, the heat sink further includes a second support member, which is fixedly connected to the second structural member.

[0018] In some embodiments, a plurality of second support portions are fixedly connected to form a plurality of second connecting portions, and the second support member and the second connecting portions are fixedly connected.

[0019] In some embodiments, the heat sink includes a first support member; the first support member and the first structural member are fixedly connected.

[0020] In some embodiments, the first support member and the second support member (400) are disposed on the same side of the heat sink.

[0021] In some embodiments, the first structural member includes a first end face fixedly connected to the first support member, the second structural member includes a second end face fixedly connected to the second support member, and the housing includes a surface opposite to the first end face and the second end face, wherein the distance between the surface and the first end face is less than the distance between the surface and the second end face.

[0022] In some embodiments, the height of the first structural member perpendicular to the first direction is greater than the height of the second structural member perpendicular to the first direction.

[0023] In some embodiments, the heat sink includes a pressure relief valve disposed on the housing.

[0024] In some embodiments, the first structural member includes a surface opposite to the pressure relief valve, the surface opposite to the pressure relief valve having a first notch opposite to the pressure relief valve.

[0025] In some embodiments, the heat sink further includes a fixing member disposed on the housing.

[0026] In some embodiments, the housing includes a shell having the receiving cavity and at least one opening; the housing also includes at least one cover plate adapted to close the opening to close the receiving cavity.

[0027] In some embodiments, the heat dissipation material is a phase change material.

[0028] This application also provides a battery device, including a heat sink provided in this application and a plurality of battery cells; the heat sink is adapted to be stacked with the battery cells along a first direction; and / or along the first direction, one or more of the battery cells are adapted to be stacked between two heat sinks.

[0029] In some embodiments, the heat dissipation component includes a first support and a second support; the first structural member includes a first sub-end face perpendicular to the height direction of the battery device and close to the bottom of the battery device, and the second structural member includes a third sub-end face perpendicular to the height direction of the battery device and close to the bottom of the battery device, the first sub-end face and the third sub-end face being located on the same side of the battery device; the first support and the first sub-end face are fixedly connected, and the second support and the third sub-end face are fixedly connected.

[0030] In some embodiments, the heat sink includes a first surface, the battery cell includes a second surface, the first surface and the second surface are disposed opposite to each other, and both the first surface and the second surface are perpendicular to the first direction.

[0031] This application also provides an electrical device, including the battery device provided in this application.

[0032] This application also provides a vehicle including the battery device provided in this application.

[0033] The heat sink of this application forms a closed receiving cavity through the outer shell, into which heat dissipation material, a first structural member, and a second structural member are placed. The first structural member has a first receiving portion opening in a first direction, and the second structural member has a second receiving portion opening in a second direction. Heat dissipation material can be filled into the first and second receiving portions. When the heat dissipation material absorbs heat and vaporizes or liquefies, the gas or liquid can flow within the first and second receiving portions, thereby timely expelling the gas or liquid from the first or second receiving portion and avoiding explosion caused by the accumulation of gas or liquid in the first or second receiving portion. At the same time, the two openings in different directions improve the overall strength of the heat sink, thereby accommodating the expansion of the battery cell and reducing the risk of thermal diffusion of the battery cell.

[0034] The battery device of this application, by arranging the battery cells and the heat sink of this application alternately or separately, enables the heat sink in the battery device to absorb the heat of the battery cells in a timely manner when thermal runaway occurs, thereby preventing the battery cells from catching fire due to thermal runaway. When the battery cells expand during cyclic use, they will compress the second structural member in the heat sink. The second structural member deforms appropriately under the compression of the battery cell expansion to provide expansion space for the battery cells, thereby preventing the battery cells from exploding due to insufficient expansion space.

[0035] Additional aspects and advantages of embodiments of this application 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 embodiments of this application. Attached Figure Description

[0036] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0037] Figure 1 This is an exploded view of a heat sink according to certain embodiments of this application;

[0038] Figure 2 This is a partially enlarged schematic diagram of a heat sink component according to certain embodiments of this application;

[0039] Figure 3 This is a top view schematic diagram of a structural component according to certain embodiments of this application;

[0040] Figure 4 This is a schematic diagram of a first structural component according to certain embodiments of this application;

[0041] Figure 5 This is a schematic diagram of a battery device according to certain embodiments of this application;

[0042] Figure 6 This is a schematic diagram of a battery device according to certain embodiments of this application.

[0043] Explanation of key component symbols:

[0044] 10 - Heat sink; 110 - First structural component; 111 - First receiving portion; 112 - First notch; 113 - First connecting portion; 114 - First supporting portion; 130 - First sub-structural component; 131 - First sub-connecting portion;

[0045] 120 - Second structural component; 121 - Second receiving part; 122 - Second connecting part; 123 - Second supporting part;

[0046] 200-Outer shell; 201-Shell; 202-Cover plate; 203-Explosion-proof valve; 204-Fixing component; 300-First support component; 400-Second support component. Detailed Implementation

[0047] The embodiments of this application are described in detail below. Examples of the 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 the embodiments of this application, and should not be construed as limiting the embodiments of this application.

[0048] In existing technologies, internal short circuits within battery cells, poor cell consistency, external circuit malfunctions, improper charging management, vibration, or external impacts can all lead to thermal runaway of battery cells in power battery devices, resulting in fires. Effectively preventing and controlling thermal runaway of battery cells is a key measure to address fires in new energy vehicles.

[0049] In conventional heat sinks, the battery cells expand during use, causing the outer surfaces of the battery cells and the heat sink to change from surface contact to point contact. At this point, the heat dissipation material in the heat sink cannot effectively conduct heat to the battery cells. Therefore, when the battery cells expand due to repeated use, the heat sink, which is meant to absorb their heat, cannot perform its heat absorption function effectively, increasing the safety risks of the battery cells. When the internal thermal runaway of the battery cells occurs, the heat sink cannot absorb the heat inside the battery cells well, which can lead to a fire and a safety accident.

[0050] To solve the above problems, this patent proposes a heat sink 10, which includes a housing 200 and a closed receiving cavity formed inside the housing 200; the heat sink 10 also includes a first structural member 110, a second structural member 120 and a heat dissipation material, all of which are placed in the receiving cavity. The first receiving portion penetrates the first structural member at least at one end along the first direction, and the second receiving portion penetrates the second structural member at least at one end along the second direction. This allows heat-dissipating material to be filled into both the first and second receiving portions. When the heat-dissipating material absorbs heat and vaporizes or liquefies, the gas or liquid can flow within the first and second receiving portions, thus allowing for timely gas discharge and preventing explosions caused by gas or liquid accumulation. Simultaneously, the first and second directions form an angle, creating an angle between the opening directions of the first and second receiving portions. This ensures that the heat sink has good structural strength in the first direction, while the second structural member provides a buffering effect in the first direction. Therefore, the heat sink improves its heat dissipation capacity while effectively supporting and buffering the heat sink through the first and second structural members. When the heat sink is subjected to significant external pressure, it can maintain its structural shape while undergoing appropriate deformation according to the external pressure. When a battery cell near the heat sink expands due to cyclic use or other reasons, the battery cell squeezes the heat sink, causing the second structural component to deform. This allows the battery cell to expand normally, avoiding the situation where the heat sink cannot deform at all, which would hinder the expansion force of the battery cell and lead to an explosion.

[0051] In the prior art, the battery cell 20 gradually expands during use. Therefore, a certain expansion space is reserved for the battery cell 20 during battery assembly. However, if there is a gap between the battery cell 20 and the heat sink 20, the heat sink 10 cannot effectively transfer heat to the battery cell when thermal runaway occurs, thus failing to perform its heat dissipation function. Therefore, in order to maintain the structural strength of the heat sink 10 while adapting to the self-expansion of the battery cell 20, the heat sink 10 should also have a structural strength that adapts to the expansion of the battery cell 20. The first structural member 110 includes a plurality of first receiving portions 111, which penetrate the first structural member 110 in the first direction X. The first structural member 110 provides good structural strength to the heat sink 10 in the first direction X. When battery units 20 are provided at both ends of the heat sink 10 in the first direction X, the simultaneous expansion of the battery units 20 at both ends will simultaneously compress the heat sink 10 located in the middle. At this time, the first structural member 110 provides sufficient structural strength in the first direction X. The first receiving portion 111 contains heat dissipation material, so the heat sink 10 will not be in a state where some areas are without heat dissipation material due to compression. The second structural member 120 includes several second receiving portions 121, which penetrate the second structural member 120 in the second direction Y. The first direction X and the second direction Y are perpendicular. When the battery unit compresses the heat sink 10 from the first direction X, the second structural member 120, due to its lack of good structural strength in the first direction X, will gradually deform under the pressure of expansion to adapt to the expansion of the battery unit 20. The first receiving portion 111 and the second receiving portion 121 with openings in two different directions improve the overall strength of the heat sink 10, thereby adapting to battery expansion and reducing the risk of heat diffusion.

[0052] In some embodiments, the second structural member 20 is closer to the surface of the outer casing near the battery cell 20, that is, within the heat sink, the second structural member 120 is closer to the battery cell 20. Thus, when the surface of the battery cell 20 expands, it will directly compress the second structural member 120. During the deformation process, the second structural member 120 remains in contact with the expanded surface of the battery cell. Therefore, during the expansion of the battery cell 20, the second structural member 120 can not only provide a certain supporting strength to buffer the expansion of the battery cell 20, but also ensure that the surface of the heat sink 10 opposite to the battery cell 20 is always in surface contact with the expanded surface of the battery cell 20. Thus, the heat sink can still play a good heat dissipation role after the battery cell expands, thereby reducing the risk of the battery device catching fire due to thermal runaway to a certain extent.

[0053] In some embodiments, the outer casing 200 comprises a housing 201 and a cover plate 202 forming a closed receiving cavity. The housing 201 may form a receiving cavity with one or more openings, and the cover plate 202 is used to close the openings. In some short-blade batteries, existing stamping technology can stamp the housing into a receiving cavity with one opening, in which case only one cover plate 202 is needed to close the housing; in some long-blade batteries, existing stamping technology can stamp a housing with openings at both ends, in which case two cover plates 202 are needed to close the openings to form a closed receiving cavity. The number and orientation of the openings in the housing are not limited in this application.

[0054] In some embodiments, the second structural member 120 is generally made of a deformable material with a certain degree of rigidity, such as aluminum. Therefore, the second structural member 120 has a certain effect of inhibiting or slowing down the expansion of the battery cell 20. At the same time, since the second structural member 120 is deformable, it can still fit with the expanded surface after deformation, thereby performing its heat absorption function normally.

[0055] In some embodiments, the heat sink 10 includes a first structural member 110 and two second structural members 120. See also... Figure 1 and Figure 3 Both the first structural member 110 and the second structural member 120 have a honeycomb structure. Honeycomb structures possess excellent geometric and mechanical properties; therefore, the first structural member 110 and the second structural member 120 with a honeycomb structure are preferred structures in this application. The first structural member 110 includes two end faces perpendicular to the first direction X, and two second structural members 120 are stacked with these two end faces respectively, that is, two second structural members 120 and one first structural member 110 are alternately stacked along the first direction X. See also 5 and... Figure 6 The second structural component 120 is located near the easily expandable surface of the battery cell. It should be noted here that, as... Figure 5 and Figure 6In the battery device, the expansion of the battery cell is usually along the first direction X, that is, the surface of the battery cell 20 near the second structural member 120 will expand. During the expansion of the battery cell 20 along the first direction X, it will squeeze the second structural member 120. During the gradual squeezing process, the second structural member 120 will slowly deform, and during the deformation process, the structural member 120 will still fit the expanded surface of the battery cell. The reason for achieving this characteristic is that the second structural member 120 is generally made of aluminum (aluminum can also reduce the weight of the battery device), which has good ductility. Of course, other ductile materials can also be used for the second structural member 120. Here, no specific restrictions are placed on the material of the second structural member 120. When the thickness of the battery cell 20 expands in the first direction X, the receiving portion of a certain area or part of the second structural member 120 is completely compressed, that is, there is no heat dissipation material in this area or part, and only the material of the second structural member itself exists, the first structural member 110 located between the two second structural members 120 exerts its structural strength capability in the first direction X; the strong supporting force of the first structural member 110 in the first direction X prevents the battery cell 20 from continuing to expand its thickness in the first direction X, and the heat dissipation material present in the first structural member 110 can effectively absorb heat in this area or part, so that the battery cell avoids catching fire due to local thermal runaway.

[0056] In some embodiments, the first structural member 110 and the second structural member 120 may also include multiple first structural members 110 and multiple second structural members 120. In this case, the multiple first structural members 110 are stacked sequentially along the first direction X, and the multiple second structural members may be disposed at at least one end of the stacked first structural members along the first direction X. Various embodiments of this implementation will be further described below.

[0057] In some embodiments, when multiple first structural members 110 are stacked sequentially along the first direction X, the projections of the first receiving portions of different first structural members 110 on a projection plane perpendicular to the first direction can completely overlap. At this time, the multiple first structural members 110 will have good structural strength in the first direction X, and the multiple first receiving portions 111 stacked in the first direction X are completely interconnected, which is more conducive to the heat transfer of the heat dissipation material.

[0058] In some embodiments, multiple second structural members 120 may also be simultaneously stacked on one end face of the first structural member 110 perpendicular to the first direction X, thus bringing the other end face of the first structural member 110 perpendicular to the first direction X closer to the housing 201. In this case, the heat sink 10 can be positioned near the housing of the battery device, meaning that only one end face of the heat sink 10 is in contact with the battery cell 20, and the other end face of the heat sink 10 is not placed outside the battery cell 20. When the battery cell 20 experiences thermal runaway, the heat sink 10 near the housing 201 acts as the last line of defense for the battery device, absorbing the heat from the battery cell while preventing the thermal runaway from escaping outside the battery device.

[0059] In some embodiments, there are more than two second structural members 120. In this case, multiple second structural members 120 can be stacked along the first direction X and then stacked with the two end faces of the first structural member 110 opposite to each other in the first direction X. In this embodiment, the second receiving portions 121 of the multiple stacked second structural members 120 may have different cross-sectional areas perpendicular to the second direction Y. Preferably, the second receiving cavity 121 of the second structural layer 120 closer to the housing 201 has a larger cross-sectional area perpendicular to the second direction Y. In this case, there will be more heat dissipation material near the housing 201, which can achieve better heat dissipation. Moreover, the larger cross-sectional area makes it easier for the battery cell 20 to expand. It should be noted that in some embodiments, some second structural members 120 may also be stacked between multiple first structural members 110, and some second structural members 120 may be disposed close to the outer shell in the first direction X. In the stacking method of the first structural member 110 and the second structural member 120, the stacking order of the first structural member 110 and the second structural member 120 is not limited. Preferably, the second structural member 120 is disposed close to the outer shell in the first direction X. This disposal can be disposed close to the outer shell at one end or at both ends. No specific limitation is made here.

[0060] In some embodiments, the second structural member 120 is closer to the outer casing in the first direction than any of the first structural members 110. In this case, the battery unit 20 is close to the second structural member 120. When the battery unit 20 expands, it will first compress the second structural member 120. Since there is an angle between the opening direction of the second receiving portion 121 and the first direction, the second structural member only has a certain structural strength in the first direction. Thus, it can deform under the pressure of the battery unit 20. During the deformation process, the second structural member 120 is still in contact with the expanded surface of the battery unit. This allows the heat sink 10 to maintain structural strength while maintaining surface contact with the battery unit 20. This avoids the surface contact between the heat sink 10 and the battery unit 20 becoming point contact due to the expansion of the battery unit 20. At the same time, the first structural member inside the heat sink can maintain good structural support for the heat sink, so that heat dissipation material is always distributed inside the heat sink, achieving a good heat dissipation effect.

[0061] In some embodiments, the first receiving portion 111 has a cross-sectional shape of regular hexagon or regular quadrilateral perpendicular to the first direction X. When the first receiving portion 111 is honeycomb-shaped or grid-shaped (i.e., quadrilateral), the first structural member 110 can provide good support in the first direction X. Of course, other first structural members 110 that can achieve high support can also be used in this application, and no specific limitation is made here. In some embodiments, the first structural member 110 is often cut to make it suitable for insertion into the corresponding housing 200. During the cutting process, the receiving portion at the edge of the first structural member 110 is not necessarily closed in the direction perpendicular to the first direction X. That is, at this time, the cross-section of the first receiving portion 111 at the edge of the first structural member 110 in the direction perpendicular to the first direction X may be any combination of straight lines and / or arcs, which will not be elaborated here.

[0062] In some embodiments, when multiple first structural members 110 are stacked sequentially along the first direction X, the first receiving portions 111 of two adjacent first structural members 110 can be misaligned to a certain extent. Specifically, referring to... Figure 4 , Figure 4 The stacking arrangement of the first structural member 110 and the first sub-structural member 130 along the first direction X is shown. It should be noted that regardless of whether the first structural member of this application is honeycomb-shaped, quadrilateral grid-shaped, or cylindrical as shown in the figures, the first structural member includes multiple first support portions 114. These multiple first support portions 114 are fixedly connected and enclose to form a first receiving portion 111. Therefore, the first structural member 110 has multiple first support portions 114 extending along the first direction X. The first support portions 114 give the first structural member 110 good structural strength in the first direction X. (Reference) Figure 4Multiple first connecting portions 113 are formed when multiple first support portions 114 are fixedly connected. The first connecting portion 113 can be considered the connection point where the multiple first support portions 114 are fixedly connected. The first connecting portion 113 also extends in the first direction X. When the first structural member 110 has a honeycomb structure, the first connecting portion 113 has excellent structural strength. Therefore, the first sub-structural member 130 has multiple first sub-connecting portions 131. The first structural member 110 with such first support portions 114 and first connecting portions 113 has excellent geometric and mechanical properties, thus providing excellent structural strength. In the first structural layer 110, each first receiving portion 111 has a geometric center along the first direction X. Placing the geometric center of adjacent first structural members 110 at the first sub-connecting portion 131 of the first sub-structural layer 130 allows the heat sink 10 to have better structural strength in the first direction X through the stacking of the first structural member 110 and the first sub-structural member 130. To interpret this geometric center from another perspective, if there exists a projection plane X perpendicular to the first direction, the orthographic projection of the geometric center of the first structural member 110 onto the projection plane coincides with the orthographic projection of the first sub-connecting portion 131 onto the projection plane. It should be noted that in some embodiments, the non-coincidence of the first support member 114 of the first structural member 110 and the first sub-support member of the first sub-structural member 130 in the first direction X can also result in better structural strength. It should be noted that the first support member 114 refers to multiple structural members constituting the first structural member 110. For example, when the first structural member 110 is a regular hexagonal honeycomb structure, each first receiving portion 111 is formed by six first support members 114 fixedly connected and enclosed, and the first connecting portion 113 is formed by three first support members 114 fixedly connected. The first connecting portion 113 can be said to refer to the part where the three first support members 114 are fixedly connected, and as shown in the figure, the first connecting portion 113 has excellent mechanical properties in the first direction X.

[0063] In some embodiments, the first structural member 110 includes first end faces opposite each other in the first direction X, and at least one of the first end faces is provided with a plurality of first support members 300. When the first structural member 110 is installed in the housing 200, the first support members 300 can create a certain distance between the first end face and the housing 201, that is, the first support members 300 can create a gap between the first structural member 110 and the housing. This gap can store heat dissipation material, thereby increasing the capacity of heat dissipation material in the heat dissipation member. At the same time, the first support members 300 can be used to provide a certain support capacity. For example, when the heat dissipation member is in motion and experiences vibration or impact, the first support members 300 can prevent the first structural member 110 from shaking in the housing, thereby improving the reliability of the heat dissipation member 10 of this application to a certain extent.

[0064] In some embodiments, the first structural member 110 includes a first end face fixedly connected to the first support member 300, the second structural member 120 includes a second end face fixedly connected to the second support member 400, and the outer shell 200 includes a surface opposite to the first end face and the second end face. The distance between the surface of the outer shell (200) opposite to the first end face and the second end face and the first end face is less than the distance between the second end face, thereby allowing more space for gas or liquid to flow within the second structural member 120. For example, in the battery device, both the first and second end faces are the bottom surfaces of the first and second structural components. The surfaces of the housing 200 opposite to the first and second end faces are also the bottom surfaces of the housing 200. That is, the first support 300 and the second support 400 are located at the bottom of the heat sink 10. The first structural component 110 and the second structural component 120 are supported by the first support 300 and the second support 400. The first support 300 and the second support 400 are fixedly connected to the bottom of the housing 200. This fixed connection is not achieved through adhesives, but rather through the gravity of the first structural component 110 and the second structural component 120. Liquids or gases generated by the phase change of the heat sink material can flow at the bottom of the heat sink 10, that is, at the bottom where the first support 300 and the second support 400 are located, thus allowing for better discharge from the heat sink 10 through the explosion-proof valve. It should be noted that in this case, when the second direction X is the height direction of the battery device, the second support member 400 and the second connecting part 122 are fixedly connected. This design makes the fixed connection between the second support member 400 and the second connecting part 122 more stable.

[0065] In some embodiments, the height of the first structural member 110 perpendicular to the first direction X is greater than the height of the second structural member (120) perpendicular to the first direction X, thereby improving the overall structural strength of the heat sink 10 while allowing more heat dissipation material to be accommodated in the cavity.

[0066] In some embodiments, the second structural member 120 includes a plurality of second support portions 123, which are fixedly connected to form a second receiving portion 121. The second support portions 123 extend toward the second direction Y, thereby the second support portions 123 have good structural strength in the second direction Y, but weaker structural strength in the first direction X. When the battery cell 20 expands, when the surface of the battery cell 20 presses against the heat sink 10 from the first direction X, the second structural member 120 of the housing 201 near the heat sink 10 will deform toward the first direction X under the pressure of the battery cell, and can still maintain surface contact with the expanded surface of the battery cell 20 during the deformation process. At this time, the heat dissipation material in the second receiving portion 121 can play a good heat dissipation role for the battery cell 20.

[0067] In some embodiments, the second structural member 120 further includes a second connecting portion 122 formed by fixing multiple second support portions 123 together. That is, the second connecting portion 122 is the connection part of the fixing connection of multiple second support portions 123. The second connecting portion 122 extends toward the second direction Y and has excellent structural strength. Therefore, when the second structural member 120 is installed in the housing 201, the second structural member 120 will not deform in the second direction Y due to its own gravity.

[0068] In some embodiments, the heat sink 10 further includes a second support member 400. The second support member 400 is fixedly connected to the second structural member 120. When the second structural member 120 is installed in the outer casing 200, the second support member 400 allows a certain distance between the second structural member 120 and the outer casing 201 in the second direction Y. That is, the second support member 400 allows a gap between the second structural member 120 and the outer casing. This gap can store heat dissipation material and allow gas or liquid to circulate within the heat sink 10. This increases the capacity of the heat dissipation material within the heat sink 10 while allowing gas or liquid generated within the heat sink 10 to circulate. It should be noted that, preferably, in some embodiments, the second direction Y is perpendicular to the first direction X. The second support member 400 and the second connecting portion 122 are fixedly connected because the second connecting portion 122 has higher structural strength in the second direction Y. Therefore, the fixed connection between the second support member 400 and the second connecting portion 122 makes the structural strength of the second connecting member 120 in the second direction Y more robust and reliable.

[0069] In some embodiments, the heat sink 10 is provided with both a first support 300 and a second support 400, and the first support 300 and the second support 400 are located at the same end of the heat sink 10. Further, one end of the first support 400 and the second support 400 is the end of the battery device closer to the ground plane. When the battery device is in use, the multiple first supports 400 and the multiple second supports 400 can respectively support the first structural member 110 and the second structural member 120, allowing gas flow at the bottom of the first structural member 110 and the second structural member 120, and allowing gas to be discharged from the heat sink 10 through the pressure relief valve 203 at the bottom. Preferably, when the length of the first support is less than the length of the second support 400, the height of the first structural member 110 is greater than the height of the second structural member 120. Here, length and height refer to characteristics relative to the height direction of the battery device. Thus, in the height direction of the battery device, the second support 400 is longer than the first support 300, allowing gas or liquid in the second receiving portion 121 to flow better from the bottom of the heat sink 10. In some embodiments, when the first support member 300 and the second support member 400 are not disposed at the bottom of the heat sink, but at the end face of the heat sink near the housing (202), the length of the first structural member 110 can also be set to be greater than the length of the second structural member 120. Here, the length refers to the direction from the positive terminal to the negative terminal of the battery cell 20.

[0070] In some embodiments, the cross-sectional shape of the second receiving portion 121 perpendicular to the second direction Y is a regular hexagon or a regular quadrilateral. Similarly, in some embodiments, the second structural member 120 is often cut. This cutting may not only cut the cross-section of the second structural member 120 perpendicular to the second direction, but may also cut the side parallel to the second direction Y, so that the second structural member 120 is suitable for insertion into the corresponding housing 200. Therefore, during the cutting process, the second receiving portions 121 on each surface of the first structural member 120 are not necessarily closed perpendicular to the second direction. That is, at this time, the cross-section of the second receiving portion 121 at the edge of the second structural member 120 perpendicular to the second direction Y may be any combination of straight lines and / or arcs, which will not be elaborated here.

[0071] In some embodiments, the housing 200 is provided with a pressure relief valve 203. This is because some heat dissipation materials generate gas or liquid during the heat dissipation process. To prevent the pressure generated by the gas or liquid from causing the heat sink 10 to explode, the housing 200 needs to be equipped with a pressure relief valve so that if the pressure on the heat sink 10 becomes too high, it can rupture the pressure relief valve 203 to release pressure. Depending on the specific design of the battery device or the battery cell 20, the pressure relief valve 203 can be located on the housing 201 or the cover plate 202. See also... Figure 1 , Figure 2 as well as Figure 5In some embodiments, the pressure relief valve 203 is located on the cover plate 202, and closer to the lower part of the battery device. Therefore, when gas in the heat sink 10 breaks through the pressure relief valve, the gas is prevented from spreading to the electrical connection structure at the top of the battery device to a certain extent. This avoids problems such as arcing or moisture damage to the electrical connection structure of the battery device, such as connectors, caused by the overflowing gas. In some embodiments, if the end face of the first structural member 110 corresponding to the pressure relief valve 203 is solid, that is, the end face of the first structural member 110 will block the pressure relief valve 203, the gas in the heat sink 10 will not be able to break through the pressure relief valve and escape, which may cause the heat sink 10 to explode. Therefore, in the embodiments of this application, when the end face of the first structural member 110 corresponding to the pressure relief valve 203 will block the pressure relief valve 203 due to sealing, a notch 112 communicating with the pressure relief valve 203 will be provided on the first structural member 110. (See reference...) Figure 1 and Figure 4 The notch 112 can prevent the first structural component 110 from blocking the pressure relief valve 203.

[0072] In some embodiments, the pressure relief valve 203 may also be located at the top or bottom of the housing. The first structural member 110 includes a third end face perpendicular to the second direction Y and opposite to the pressure relief valve 203. The third end face is provided with a notch 112 opposite to the pressure relief valve. That is, no matter where the pressure relief valve is located in the housing 200, if the end face of the first structural member 110 forms a blockage against the pressure relief valve 203 after installation, preventing the gas from breaking through the pressure relief valve 203, a notch can be made on the first structural member 110 at the location corresponding to the pressure relief valve 203, so that the gas in the heat sink 10 can easily break through the pressure relief valve to achieve pressure relief.

[0073] This application also provides a battery device 1000, which includes a battery cell 20 and a heat sink 10, see reference. Figure 5 and Figure 6 The dimensions of the heat sink 10 are the same as those of the battery cell 20. Of course, in some embodiments, the dimensions of the heat sink 10 and the battery cell 20 may differ. For example, to minimize thermal runaway while maintaining a high energy density of the battery device 1000, the thickness of the heat sink 10 in the first direction X may be less than the thickness of the battery cell 20. The battery device 1000 of this application, by arranging the battery cells and the heat sink alternately or spaced apart, ensures that when thermal runaway occurs in the battery cell, the heat sink in the battery device can absorb the heat from the battery cell in a timely manner, thereby preventing the battery cell from catching fire due to thermal runaway. When the battery cell expands during cyclic use, it compresses the second structural member in the heat sink. The second structural member deforms appropriately under the compression of the expanding battery cell, providing expansion space for the battery cell and preventing explosion due to insufficient expansion space.

[0074] In some embodiments, in order to facilitate the assembly of the battery device 1000, a fastener 204 is provided on the housing 200. The fastener 204 facilitates the heat sink 10 to be clamped or moved by a jig or other equipment during the automated assembly process.

[0075] It should be noted that in some embodiments, the heat sink 10 and the battery unit 20 can be arranged in alternating layers, such as... Figure 5 At this time, the risk of thermal runaway of the battery device 1000 will be greatly reduced. All battery cells 20 are in contact with the heat sink 10, and the heat of the battery cells 20 can be absorbed by the heat sink 10 in time, so the risk of thermal runaway will be greatly reduced.

[0076] In some embodiments, in order to maintain a high energy density while reducing the risk of thermal runaway and thus making the product more competitive, the battery device 2000 uses as few heat sinks 10 as possible while ensuring heat dissipation. In this case, multiple battery cells 20 are arranged between two heat sinks 10. See [reference needed] Figure 6 At this time, the heat sink 10 can still absorb the heat from multiple adjacent or nearby battery cells 20, thereby reducing the risk of thermal runaway of the battery device 2000 and enabling the battery device 2000 to have a high energy density. It should be noted that the number of battery cells 20 arranged between two heat sinks 10 can be several, a dozen, or even dozens, depending on the heat dissipation efficiency of the heat dissipation material in the heat sink 10, the volume of the heat dissipation material, or the volume of the battery cell 20. No specific limitation is made here, and similar embodiments are all within the protection scope of this application.

[0077] Furthermore, in order to facilitate the smooth flow of heat dissipation materials in the first receiving portion 111 and the second receiving portion 121 after phase change, a first support member 300 and a second support member 400 are usually provided at the bottom of the first structural member 110 and the second structural member 120, respectively. The first support member 300 and the second support member 400 support the first structural member 110 and the second structural member 120, thereby allowing gas or liquid in the first receiving portion and the second receiving portion to flow at the bottom of the heat dissipation component, further improving the heat dissipation capacity of the heat dissipation component.

[0078] It should be noted that the commonly used heat dissipation materials are phase change materials, such as hydrated salt phase change materials, organic phase change materials, molten salt phase change materials, metal phase change materials, and alloy phase change materials. Therefore, the heat dissipation material of this application can be one of the following: hydrated salt phase change materials, organic phase change materials, molten salt phase change materials, metal phase change materials, and alloy phase change materials, such as cryogel and other heat dissipation materials.

[0079] It should be further noted that in some embodiments, the first structural member 110 and the second structural member 120 do not form a receiving portion, because the function of the first structural member 110 and the second structural member 120 is to support the pressure on the heat sink 10 from the expansion of the battery cell 20. Therefore, the structural member can also be a "well" shaped structural member, and the heat dissipation material is injected into the receiving cavity of the outer shell to fill the outer shell. At this time, the purpose of this application can still be achieved, that is, while controlling the pressure generated when the battery cell 20 expands, it can also dissipate heat for the battery cell 20. Such embodiments are also within the protection scope of this application, and will not be described in detail here.

[0080] In the battery device 1000 of this application, the heat sink 10 and the battery cell 20 are attached when stacked, that is, the heat sink 10 includes a first surface that is attached to the battery cell 20, and the battery cell 20 includes a second surface that is attached to the heat sink 10. Both the first surface and the second surface are perpendicular to the first direction X.

[0081] This application also provides a vehicle in which the battery device 1000 or battery device 2000 of this application is installed. Because of the heat dissipation component of this application, the risk of thermal runaway of the battery device 1000 or battery device 2000 is significantly reduced, thereby improving the safety performance of the vehicle.

[0082] The battery device provided in this application can be a power battery or other types of battery packs.

[0083] This application also provides an electrical device, which includes the battery device provided in this application.

[0084] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. 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.

[0085] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A heat sink for use in a battery device, characterized in that, include: The outer shell (200) forms a closed receiving cavity; At least one first structural member (110) includes a plurality of first receiving portions (111), and at least one end of each first receiving portion (111) extends through the first structural member (110) along a first direction. The first structural member (110) is placed in the receiving cavity. At least one second structural member (120) includes a plurality of second receiving portions (121) along a second direction, at least one end of the second receiving portion (121) penetrates through the second structural member (120), and the second structural member (120) is placed in the receiving cavity; The first structural member (110) and the second structural member (120) are stacked; A heat dissipation material is placed in the receiving cavity and / or the first receiving part (111) and / or the second receiving part (121); The first direction and the second direction have an angle between them.

2. The heat sink according to claim 1, characterized in that, The first receiving portion (111) has a cross-sectional shape that is either a regular hexagon or a regular quadrilateral in the direction perpendicular to the first direction.

3. The heat sink according to claim 1, characterized in that, The second receiving portion (121) has a cross-sectional shape that is either a regular hexagon or a regular quadrilateral in the direction perpendicular to the second direction.

4. The heat sink according to claim 1, characterized in that, The heat dissipation component includes one first structural component (110) and two second structural components (120). Along the first direction, the second structural components (120) are stacked at both ends of the first structural component (110).

5. The heat sink according to any one of claims 1-3, characterized in that, The heat dissipation component includes a plurality of first structural components (110) and a plurality of second structural components (120), which are stacked along a first direction; in the first direction, at least a portion of the second structural components (120) are disposed close to the housing relative to any one of the first structural components (110).

6. The heat sink according to claim 5, characterized in that, Multiple first structural members (110) are stacked along the first direction; along the first direction, the second structural members (120) are disposed at both ends of the stacked multiple first structural members (110).

7. The heat sink according to any one of claims 1-3, characterized in that, The first structural member (110) includes a plurality of first support portions (114), which are fixedly connected to form the first receiving portion.

8. The heat sink according to claim 7, characterized in that, The heat dissipation component includes a plurality of the first structural components (110), and the plurality of the first structural components (110) are stacked along the first direction; In the first direction, a plurality of first support portions (114) of one of two adjacent first structural members (110) and a plurality of first support portions (114) of the other partially overlap.

9. The heat sink according to claim 7, characterized in that, In the first direction, the geometric center of at least a portion of the first receiving portion (111) of one of two adjacent first structural members (110) coincides with at least a portion of the first support portion (114) of the other.

10. The heat sink according to claim 7, characterized in that, Multiple first support portions (114) are fixedly connected to form a first connecting portion (113); In the first direction, the geometric center of the first receiving portion (111) of one of the two adjacent first structural members (110) coincides with the first connecting portion (113) of the other.

11. The heat sink according to claim 1, characterized in that, The heat dissipation component also includes a first support member (300), which is fixedly connected to the first structural member (110), and the first support member (300) is located between the first structural member (110) and the outer shell (200).

12. The heat sink according to claim 11, characterized in that, The first structural member (110) includes a first end face arranged parallel to the first direction, and the first support member (300) is fixedly connected to the first end face.

13. The heat sink according to claim 1, characterized in that, The second structural member (120) includes a plurality of second support portions (123), which are fixedly connected to form the second receiving portion.

14. The heat sink according to claim 13, characterized in that, The heat dissipation component also includes a second support member (400), which is fixedly connected to the second structural member (120).

15. The heat sink according to claim 14, characterized in that, Multiple second support portions (123) are fixedly connected to form multiple second connecting portions (122), and the second support member (400) and the second connecting portions (122) are fixedly connected.

16. The heat sink according to claim 14, characterized in that, The heat dissipation component includes a first support member (300); the first support member (300) and the first structural member (110) are fixedly connected.

17. The heat sink according to claim 16, characterized in that, The first support member (300) and the second support member (400) are disposed on the same side of the heat sink.

18. The heat sink according to claim 17, characterized in that, The first structural member (110) includes a first end face that is fixedly connected to the first support member (300), the second structural member (120) includes a second end face that is fixedly connected to the second support member (400), and the outer shell (200) includes a surface that is opposite to the first end face and the second end face, and the distance between the surface and the first end face is less than the distance between the surface and the second end face.

19. The heat sink according to claim 17, characterized in that, The height of the first structural member (110) perpendicular to the first direction is greater than the height of the second structural member (120) perpendicular to the first direction.

20. The heat sink according to claim 1, characterized in that, The heat dissipation component includes a pressure relief valve (203), which is disposed on the housing (200).

21. The heat sink according to claim 20, characterized in that, The first structural member (110) includes a surface opposite to the pressure relief valve (203), and the surface opposite to the pressure relief valve (203) is provided with a first notch (112) opposite to the pressure relief valve (203).

22. The heat sink according to claim 1, characterized in that, The heat dissipation component also includes a fixing member (204), which is disposed on the outer casing (200).

23. The heat sink according to claim 1, characterized in that, The outer casing (200) includes a housing (201), the housing (201) having the receiving cavity, and the housing having at least one opening; The housing (200) also includes at least one cover plate (202) adapted to close the opening to close the receiving cavity.

24. The heat sink according to claim 1, characterized in that, The heat dissipation material is a phase change material.

25. A battery device, characterized in that, Includes a heat sink as described in any one of claims 1-24 and a plurality of battery cells (20); the heat sink is adapted to be stacked with the battery cells (20) along a first direction; and / or Along the first direction, one or more of the battery cells (20) are adapted to be stacked between the two heat sinks.

26. The battery device according to claim 25, characterized in that, The heat dissipation component includes a first support (300) and a second support (400); The first structural member (110) includes a first sub-end face perpendicular to the height direction of the battery device and close to the bottom of the battery device, and the second structural member includes a third sub-end face perpendicular to the height direction of the battery device and close to the bottom of the battery device. The first sub-end face and the third sub-end face are located on the same side of the battery device. The first support member (300) is fixedly connected to the first sub-end face, and the second support member (400) is fixedly connected to the third sub-end face.

27. The battery device according to claim 25, characterized in that, The heat sink includes a first surface, and the battery cell includes a second surface. The first surface and the second surface are disposed opposite to each other, and both the first surface and the second surface are perpendicular to the first direction.

28. An electrical appliance, characterized in that, Includes the battery device as described in claim 26.

29. A vehicle, characterized in that, Includes the battery device as described in claim 26.

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