Heat exchange device, battery assembly, battery pack and power utilization system

Abstract

The utility model discloses a heat exchange device, battery pack, battery pack and power utilization system, the heat exchange device includes heat absorbing member and sealing member, the sealing member is covered outside the heat absorbing member, the sealing member has at least one weak space, and the weak space is covered outside the sealing member. According to the structure of the sealing piece, when the pressure in the sealing piece reaches a preset threshold value, the position, close to the weak space, of the sealing piece is broken, and the area of the side, close to the heat absorption piece, of the weak space is larger than the area of the side, away from the heat absorption piece, of the weak space. According to the heat exchange device disclosed by the utility model, the heat absorption piece can absorb heat of the battery cell, and the weak space is beneficial to emission of gas in the sealing piece so as to be beneficial to use of the heat exchange device.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a heat exchange device, a battery assembly, a battery pack and an electricity system. Background Art

[0002] The battery assembly will generate a large amount of heat during operation, which may cause thermal runaway of the battery cells of the battery assembly, thus affecting the use of the battery cells.

[0003] In the related art, in order to suppress the spread of heat during the thermal runaway of the battery cell, aerogel is generally used to delay the thermal diffusion of the battery cell. However, aerogel can only delay the transfer of heat and it is difficult to effectively absorb the large amount of heat released from the inside of the battery assembly. The heat exchanger with aerogel inside is sandwiched between the large surfaces of two adjacent battery cells. When the battery cell has thermal runaway, a large amount of high-temperature gas is generated in the heat exchanger, and the heat exchanger will swell and be squeezed by the battery cell, which may cause the heat exchanger to be damaged or deformed. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a heat exchange device, wherein the heat absorbing member can absorb the heat of the battery core, and the weak space is conducive to the discharge of the gas in the sealing member, so as to facilitate the use of the heat exchange device.

[0005] The second objective of the present utility model is to provide a battery assembly using the above heat exchange device.

[0006] The third object of the present utility model is to provide a battery pack using the above-mentioned heat exchange device or the above-mentioned battery assembly.

[0007] The fourth objective of the present utility model is to provide an electric power system using the above-mentioned battery pack.

[0008] According to the first aspect of the present invention, the heat exchange device includes: a heat absorbing member; a sealing member, wherein the sealing member is coated on the outside of the heat absorbing member, the sealing member has at least one weak space, and the sealing member is configured to break when the pressure in the sealing member reaches a preset threshold value, and the area of ​​the weak space on a side adjacent to the heat absorbing member is greater than the area of ​​the weak space on a side away from the heat absorbing member.

[0009] According to the heat exchange device of the utility model, the heat absorbing element will vaporize when absorbing heat. When the pressure in the seal reaches a preset threshold, the gas can break through the weak space away from the side of the heat absorbing element, so that the gas can be smoothly discharged to the outside of the seal, avoiding the explosion of the heat absorbing element or the disorder of the gas in the containing chamber, which is conducive to the normal use of the heat exchange device. Moreover, through the setting of the weak space, it is easy to open the exhaust channel of the gas under the action of the pressure in the seal, so that the gas is preferentially discharged from the weak space. In addition, the heat on the battery assembly is absorbed by the vaporization of the heat absorbing element, which helps to cool the battery assembly, thereby helping to extend the service life of the battery assembly. In addition, by setting the area change of the weak space from the side adjacent to the heat absorbing element to the side away from the heat absorbing element, it is not only conducive to the gas breaking through the seal, but also improves the smoothness of the gas flow, thereby increasing the speed of the gas breaking through the seal.

[0010] According to some embodiments of the utility model, the sealing component includes: a first sealing layer; a second sealing layer, wherein the second sealing layer is arranged on one side of the thickness direction of the first sealing layer, the outer periphery of the second sealing layer is connected to the outer periphery of the first sealing layer to form an accommodating cavity, the heat absorbing component is located in the accommodating cavity, and the outer periphery of the second sealing layer and the outer periphery of the first sealing layer jointly define the weak space.

[0011] According to some embodiments of the utility model, the weak space is communicated with the accommodating cavity; or, the weak space is separated from the accommodating cavity, and the connection force between the outer periphery of the first sealing layer and the outer periphery of the second sealing layer on the side of the weak space facing the heat absorption component is smaller than the connection force between the outer periphery of the first sealing layer and the outer periphery of the second sealing layer in the remaining part except the weak space.

[0012] According to some embodiments of the present invention, a side of the weak space adjacent to the heat absorbing element is open and communicated with the accommodating cavity.

[0013] According to some embodiments of the present invention, the connection width between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer in the remaining part except the weak space is a, and the minimum distance between the side of the weak space away from the heat absorption component and the outer periphery of the sealing component is b, wherein b satisfies: 0.2a<b<0.8a.

[0014] According to some embodiments of the present invention, the connection width between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer in the remaining part except the weak space is a, wherein a satisfies: 2mm≤a≤10mm.

[0015] According to some embodiments of the present invention, a projection of the weak space on the first sealing layer has a first side edge and a second side edge, and a distance between the first side edge and the second side edge tends to decrease from a side of the weak space adjacent to the heat absorbing element toward a side of the weak space away from the heat absorbing element.

[0016] According to some embodiments of the present invention, one end of the first side away from the heat absorption component is connected to one end of the second side away from the heat absorption component.

[0017] According to some embodiments of the present invention, the inclination angle of the first side relative to the corresponding edge of the seal is α, wherein α satisfies: 5°≤α≤60°; and / or the inclination angle of the second side relative to the corresponding edge of the seal is β, wherein β satisfies: 5°≤β≤60°.

[0018] According to some embodiments of the present invention, the projection shape of the weak space on the first sealing layer is a triangle.

[0019] According to some embodiments of the present invention, the projection shape of the weak space on the first sealing layer is an equilateral triangle.

[0020] According to some embodiments of the present invention, the heat absorption element is a phase change material element.

[0021] According to some embodiments of the present invention, the phase change material piece is hydrogel or water.

[0022] According to the battery assembly of the embodiment of the second aspect of the utility model, it includes: a plurality of battery cells, which are arranged in sequence; at least one heat exchange device, which is the heat exchange device according to the embodiment of the first aspect of the utility model, and the heat exchange device is arranged between two adjacent battery cells.

[0023] According to some embodiments of the present invention, the weak space of the heat exchange device is close to a side of the battery core where an explosion-proof valve is provided.

[0024] According to the battery pack according to the third aspect of the utility model, according to the heat exchange device according to the first aspect of the utility model, or according to the battery assembly according to the second aspect of the utility model.

[0025] According to an embodiment of the fourth aspect of the utility model, the power consumption system includes a battery pack according to an embodiment of the third aspect of the utility model.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 is a schematic diagram of a heat exchange device according to an embodiment of the utility model, wherein the second sealing layer is not shown;

[0029] Figure 2 yes Figure 1 Enlarged view of section A shown in the middle circle.

[0030] Reference numerals:

[0031] 100. Heat exchange device;

[0032] 1. Heat absorbing parts;

[0033] 2. Seals; 21. Weak spaces;

[0034] 211. First side edge; 212. Second side edge; 22. First sealing layer. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1 and Figure 2 The heat exchange device 100 according to the first embodiment of the utility model is described. The heat exchange device 100 of the present application is described in detail by taking the use of the battery assembly as an example.

[0036] like Figure 1 and Figure 2 As shown, the heat exchange device 100 according to the first embodiment of the utility model includes a heat absorption component 1 and a sealing component 2.

[0037] Specifically, the seal 2 is coated on the outside of the heat absorbing member 1, and the seal 2 has at least one weak space 21. The seal 2 is configured to break when the pressure inside the seal 2 reaches a preset threshold value, and the area of ​​the weak space 21 adjacent to the heat absorbing member 1 is greater than the area of ​​the weak space 21 away from the heat absorbing member 1.

[0038] For example, in Figure 1 and Figure 2 In the example, when the seal 2 is in a sealed state, the heat absorbing member 1 is located inside the seal 2, and the inside of the seal 2 is not connected to the outside of the seal 2. The side of the weak space 21 adjacent to the heat absorbing member 1 is Figure 1The cross-sectional area of ​​the weak space 21 in the direction perpendicular to the surface of the seal 2 is greater than the cross-sectional area of ​​the side of the weak space 21 away from the heat absorber 1 in the thickness direction. When the pressure in the seal 2 reaches a predetermined threshold, the seal 2 is broken near the weak space 21 so that the inside of the seal 2 is connected to the outside of the seal 2 through the weak space 21. It should be noted that when the thickness of the weak space 21 is small and approximately negligible, the length of the side of the weak space 21 near the heat absorber 1 (for example, Figure 1 The dimension in the vertical direction is greater than the length of the weak space 21 on the side away from the heat absorbing element 1. Figure 1 As shown, the weak space 21 is formed at the right edge of the sealing member 2. Of course, the weak space 21 can also be formed at the edges of other directions on the sealing member 2. The sealing member 2 has a receiving cavity (not shown) inside, and the receiving cavity is used to receive the heat absorbing member 1.

[0039] With such arrangement, when the heat exchange device 100 is used in a battery assembly, a large amount of heat is generated when the battery cell of the battery assembly undergoes thermal runaway, and the heat absorption element 1 quickly absorbs the heat and vaporizes to generate a large amount of gas. The gas will cause a sudden increase in pressure in the seal 2, and the gas will be squeezed into the weak space 21. The gas impacts the seal 2 on the side of the weak space 21 away from the heat absorption element 1. When the pressure in the seal 2 reaches a preset threshold value (in other words, when the pressure in the weak space 21 reaches the preset threshold value), the gas breaks through the seal 2 on the side of the weak space 21 away from the heat absorption element 1, so that the weak space 21 is connected with the outside of the seal 2, and further the accommodating cavity of the seal 2 is connected with the outside of the seal 2, and the gas can be discharged from the seal 2, which is conducive to orderly exhaust of the heat exchange device 100, avoiding the explosion of the heat absorption element 1 or the internal gas of the seal 2 from being mixed, and further facilitating the normal use of the heat exchange device 100. Moreover, by setting the weak space 21, the gas exhaust passage (i.e., the communication passage between the weak space 21 and the outside of the seal 2) is easily opened under the action of pressure, so that the gas is preferentially discharged from the weak space 21 to the outside of the seal 2. In addition, the heat absorbing element 1 can absorb a large amount of heat during the vaporization process, thereby facilitating the absorption of heat from the battery core of the battery assembly, reducing the temperature of the battery assembly, and thus facilitating the normal use of the battery assembly for a long time.

[0040] In addition, the area of ​​the weak space 21 on the side adjacent to the heat absorbing member 1 is larger, which is conducive to the gas in the seal 2 flowing to the weak space 21. The area of ​​the weak space 21 on the side away from the heat absorbing member 1 is smaller, which is conducive to increasing the pressure on the side of the weak space 21 away from the heat absorbing member 1, increasing the stress concentration effect on the side of the weak space 21 away from the heat absorbing member 1, thereby facilitating the gas to break through the seal 2 for discharge. On the other hand, the change in the area of ​​the weak space 21 from the side adjacent to the heat absorbing member 1 to the side away from the heat absorbing member 1 has a guiding effect on the flow of the gas, thereby facilitating the gas to flow smoothly from the side of the weak space 21 adjacent to the heat absorbing member 1 to the side of the weak space 21 away from the heat absorbing member 1, improving the smoothness of the gas flow, and also increasing the speed of the gas flow breaking through the seal 2.

[0041] According to the heat exchange device 100 of the utility model, the heat absorbing element 1 will vaporize when absorbing heat. When the pressure in the seal 2 reaches a preset threshold, the gas can break through the weak space 21 away from the side of the heat absorbing element 1, so that the gas can be smoothly discharged to the outside of the seal 2, avoiding the explosion of the heat absorbing element 1 or the disorder of the gas inside the seal 2 (i.e., the accommodating chamber), thereby facilitating the normal use of the heat exchange device 100. Moreover, through the setting of the weak space 21, it is easy to open the exhaust channel of the gas under the action of the pressure in the seal 2, so that the gas is preferentially discharged from the weak space 21. In addition, the heat on the battery assembly is absorbed by the vaporization of the heat absorbing element 1, which helps to cool the battery assembly, thereby helping to extend the service life of the battery assembly. In addition, by setting the area change of the weak space 21 from the side adjacent to the heat absorbing element 1 to the side away from the heat absorbing element 1, it is not only conducive to the gas breaking through the seal 2, but also improves the smoothness of the gas flow, thereby increasing the speed of the gas breaking through the seal 2.

[0042] According to some embodiments of the present invention, referring to Figure 1 The sealing member 2 includes a first sealing layer 22 and a second sealing layer (not shown).

[0043] Specifically, the second sealing layer is arranged on one side of the thickness direction of the first sealing layer 22, the outer periphery of the second sealing layer is connected to the outer periphery of the first sealing layer 22 to form a accommodating cavity (not shown in the figure), the heat absorption component 1 is located in the accommodating cavity, and the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22 jointly define a weak space 21.

[0044] For example, in Figure 1In the example, the heat absorber 1 is located in the middle area between the first sealing layer 22 and the second sealing layer, the outer peripheral edges of the first sealing layer 22 and the second sealing layer are connected to form a sealing member 2 with a hollow interior, the heat absorber 1 is located in the sealing area (i.e., the accommodating cavity) formed between the first sealing layer 22 and the second sealing layer, the heat absorber 1 is located in the accommodating cavity, the sealing member 2 wraps the heat absorber 1, the weak space 21 is located at the connection between the outer peripheral edge of the first sealing layer 22 and the outer peripheral edge of the second sealing layer, and the outer peripheral edge of the second sealing layer and the outer peripheral edge of the first sealing layer 22 are not connected to jointly define the weak space 21. That is, the outer peripheral edge of the first sealing layer 22 and the outer peripheral edge of the second sealing layer are pressed together to be connected, and the first sealing layer 22 portion and the second sealing layer portion at the weak space 21 are not connected. The connection width between the outer peripheral edge of the second sealing layer and the outer peripheral edge of the first sealing layer 22 at the weak space 21 is smaller than the connection width between the outer peripheral edge of the second sealing layer and the outer peripheral edge of the first sealing layer 22 at the rest of the portion except the weak space 21.

[0045] With such arrangement, the connection width between the first sealing layer 22 and the second sealing layer on the right side of the weak space 21 (i.e., the side of the weak space 21 away from the heat absorption component 1) is narrower, so that when the air pressure in the seal 2 reaches the pre-threshold value, the gas can easily break through the connection between the first sealing layer 22 and the second sealing layer in the weak space 21, thereby ensuring that the gas can flow out of the seal 2, avoiding the seal 2 from exploding or the gas in the seal 2 from flowing randomly. In addition, the space occupied by the weak space 21 in the seal 2 is also reduced, and the space for placing the heat absorption component 1 in the seal 2 is increased, that is, the space of the accommodating cavity is increased. It should be noted that the outer periphery refers to the circumferential edge of the component. The descriptions of the left and right positions in this application are all referenced. Figure 1 The left and right directions indicated by the arrows are, for example, the right side of the weak space 21, that is, the side of the weak space 21 away from the heat absorbing element 1, and the left side of the weak space 21, that is, the side of the weak space 21 close to the heat absorbing element 1.

[0046] According to some optional embodiments of the utility model, the first sealing layer 22 and the second sealing layer are integrally formed. Thus, the connection strength between the outer periphery of the first sealing layer 22 and the outer periphery of the second sealing layer is strengthened. It should be noted that the seal 2 can be injection molded by a mold having a protruding structure, and the remaining part of the mold is removed to form the seal 2, and the position of the protruding structure corresponding to the seal 2 forms a receiving cavity and a weak space 21.

[0047] According to some embodiments of the present invention, referring to Figure 1 , the weak space 21 is connected to the accommodating cavity (i.e., the interior of the sealing member 2). Figure 1In the example, when the seal 2 is in a sealed state, the heat absorbing element 1 is located in the accommodating cavity, the accommodating cavity is connected to the weak space 21, and the accommodating cavity is not connected to the outside of the seal 2. In this way, when the heat absorbing element 1 quickly absorbs heat and vaporizes to generate a large amount of gas, the pressure of the gas in the seal 2 will increase suddenly, and the gas in the accommodating cavity will flow to the weak space 21, and then break through the adjacent weak space 21 of the seal 2 to flow out, which is conducive to the gas flowing to the weak space 21, improving the smoothness of the gas flowing between the accommodating cavity and the weak space 21, and further facilitating the normal use of the heat exchange device 100.

[0048] According to other embodiments of the present invention, the weak space 21 is separated from the accommodating cavity (not shown in the figure), and the connection force between the outer periphery of the first sealing layer 22 and the outer periphery of the second sealing layer on the side of the weak space 21 facing the heat absorber 1 is smaller than the connection force between the outer periphery of the first sealing layer 22 and the outer periphery of the second sealing layer in the remaining part except the weak space 21.

[0049] For example, the first sealing layer 22 and the second sealing layer are connected to the portion corresponding to the side of the weak space 21 facing the heat absorbing member 1, so as to separate the weak space 21 from the accommodating chamber. When the pressure of the accommodating chamber (i.e., the inside of the sealing member 2) reaches a predetermined threshold, the gas first breaks through the connection portion between the outer periphery of the first sealing layer 22 and the outer periphery of the second sealing layer on the side of the weak space 21 facing the heat absorbing member 1, and then flows into the weak space 21 to break through the connection portion between the outer periphery of the first sealing layer 22 and the outer periphery of the second sealing layer on the side of the weak space 21 away from the heat absorbing member 1. In this way, the pressure of the gas flowing to the weak space 21 can be buffered, and other parts of the sealing member 2 can be prevented from being damaged due to the high pressure of the gas in the process of breaking through the sealing member 2, thereby helping to improve the recycling rate of the sealing member 2. It should be noted that the area of ​​the weak space 21 is the cross-sectional area of ​​the weak space 21 in the direction perpendicular to the surface of the sealing member 2. When the weak space 21 is connected to or separated from the interior of the seal 2 , the area of ​​the weak space 21 is the cross-sectional area of ​​the unconnected outer periphery of the seal 2 in a direction perpendicular to the surface of the seal 2 .

[0050] According to some embodiments of the present invention, referring to Figure 1 , the side of the weak space 21 adjacent to the heat absorbing element 1 is open and communicates with the accommodating cavity (i.e., the space where the heat absorbing element 1 is located). Figure 1In the example, the left side of the weak space 21 (i.e., the side of the weak space 21 close to the heat absorbing element 1) is connected to the accommodating cavity (i.e., the space where the heat absorbing element 1 is located). In this way, the gas generated after the heat absorbing element 1 is vaporized can flow from the accommodating cavity into the weak space 21, so that the gas can break through the connection between the first sealing layer 22 and the second sealing layer after flowing through the weak space 21, thereby reducing the difficulty of gas discharge, thereby facilitating the normal use of the heat exchange device 100 and improving the exhaust speed of the heat exchange device 100.

[0051] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 The connection width between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22 in the remaining part except the weak space 21 is a, and the minimum distance between the side of the weak space 21 away from the heat absorption component 1 and the outer periphery of the sealing component 2 (that is, the circumferential edge of the sealing component 2) is b, where b satisfies: 0.2a<b<0.8a.

[0052] For example, when the minimum distance b between the side of the weak space 21 away from the heat absorption element 1 and the outer periphery of the seal 2 is less than or equal to 0.2 times the connection width a between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22 in the remaining part except the weak space 21, the minimum distance between the side of the weak space 21 away from the heat absorption element 1 and the outer periphery of the seal 2 is small, and the minimum connection width between the first sealing layer 22 and the second sealing layer on the right side of the weak space 21 (i.e., the side of the weak space 21 away from the heat absorption element 1) is narrow, so that when the pressure in the seal 2 does not reach the preset threshold, the gas can break through the connection on the right side of the weak space 21, so that the gas flows out of the seal 2, affecting the normal use of the heat absorption element 1, thereby reducing the heat absorption capacity of the heat absorption element 1, and it is not easy to cool the battery assembly.

[0053] When the minimum distance b between the side of the weak space 21 away from the heat absorption element 1 and the outer periphery of the seal 2 is greater than or equal to 0.8 times the connection width a between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22 in the remaining part except the weak space 21, the minimum connection width between the first sealing layer 22 and the second sealing layer on the right side of the weak space 21 (i.e., the side of the weak space 21 away from the heat absorption element 1) is wider. When the pre-threshold value is reached in the seal 2, it is not easy for the gas to break through the connection between the first sealing layer 22 and the second sealing layer on the right side of the weak space 21, which may easily cause explosion in the seal 2 or gas chaos in the seal 2, thereby causing damage to the heat exchange device 100, which is not conducive to the normal use of the heat exchange device 100 and the battery assembly.

[0054] Therefore, by setting the connection width a between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22 in the remaining part except the weak space 21, the minimum distance b between the side of the weak space 21 away from the heat absorber 1 and the outer periphery of the seal 2 satisfies 0.2a<b<0.8a, and the minimum distance between the side of the weak space 21 away from the heat absorber 1 and the outer periphery of the seal 2 is moderate, which effectively ensures that before the gas pressure in the seal 2 reaches a preset threshold, the gas is not easy to break through the connection between the first sealing layer 22 and the second sealing layer on the right side of the weak space 21 (i.e., the side of the weak space 21 away from the heat absorber 1), so that the heat absorber 1 can continue to be used normally to absorb the heat of the battery assembly, avoid thermal runaway of the battery assembly, and improve the utilization rate of the heat absorber 1. In addition, it is also effectively ensured that when the air pressure in the seal 2 reaches a preset threshold, the gas can break through the connection between the first sealing layer 22 and the second sealing layer on the right side of the weak space 21, allowing the gas to flow out to the outside of the seal 2, thereby avoiding explosions in the seal 2 or gas chaos in the seal 2, which is beneficial to the normal use of the heat exchange device 100, and further beneficial to the long-term normal use of the battery assembly.

[0055] According to some embodiments of the present invention, referring to Figure 2 , the connection width between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22 in the remaining part except the weak space 21 is a, where a satisfies: 2mm≤a≤10mm. For example, when the connection width a between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22 in the remaining part except the weak space 21 is less than 2mm, the connection width between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22 in the remaining part except the weak space 21 is narrow, which may easily cause poor sealing between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22, thereby reducing the sealing performance inside the sealing member 2 and causing the sealing member 2 to be easily damaged. When the connection width a between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22 in the remaining part except the weak space 21 is greater than 10 mm, the connection width between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22 in the remaining part except the weak space 21 is relatively wide, and the connection width between the first sealing layer 22 and the second sealing layer on the right side of the weak space 21 (i.e., the side of the weak space 21 away from the heat absorbing member 1) is also relatively wide, which reduces the space inside the sealing member 2, thereby reducing the accommodation capacity of the heat absorbing member 1, reducing the heat absorbed by the heat absorbing member 1, and is not conducive to the heat dissipation of the battery assembly. In addition, unnecessary materials are wasted, and the material utilization rate of the sealing member 2 is reduced.

[0056] Thus, by setting the connection width a between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22 in the remaining part except the weak space 21 to satisfy 2mm≤a≤10mm, the connection width between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22 in the remaining part except the weak space 21 is reasonably set, thereby improving the edge sealing yield of the second sealing layer and the first sealing layer 22, so that the edge sealing of the second sealing layer and the first sealing layer 22 is free of bubbles and wrinkles, and the sealing performance of the sealing member 2 is also improved, effectively avoiding the contact between the heat absorbing member 1 and the external air of the sealing member 2, thereby facilitating the normal use of the heat exchange device 100. In addition, the space inside the sealing member 2 is increased, so that the use amount of the heat absorbing member 1 can be increased, the heat absorbed by the heat absorbing member 1 is increased, or the use time of the heat absorbing member 1 is extended, thereby improving the use performance of the heat exchange device 100. Moreover, the material waste of the sealing member 2 is also avoided, thereby improving the material utilization rate of the sealing member 2.

[0057] According to some embodiments of the present invention, referring to Figure 1 and Figure 2 The projection of the weak space 21 on the first sealing layer 22 has a first side edge 211 and a second side edge 212, and the distance between the first side edge 211 and the second side edge 212 decreases from the side of the weak space 21 adjacent to the heat absorbing element 1 toward the side of the weak space 21 away from the heat absorbing element 1. Figure 1 and Figure 2 In the example, the first side 211 and the second side 212 approach each other in the direction from left to right. The gradually decreasing distance between the first side 211 and the second side 212 includes the following situations: First, the first side 211 extends approximately horizontally in the direction from left to right, and the second side 212 extends upwardly and obliquely in the direction from left to right. Second, the first side 211 extends downwardly and obliquely in the direction from left to right, and the second side 212 extends approximately horizontally in the direction from left to right. Third, the first side 211 extends downwardly and obliquely in the direction from left to right, and the second side 212 extends upwardly and obliquely in the direction from left to right. In addition, the arrangement of the first side 211 and the second side 212 includes the following situations: First, the right end of the first side 211 (i.e., the end of the first side 211 away from the heat absorber 1) and the right end of the second side 212 (i.e., the end of the second side 212 away from the heat absorber 1) are connected. Second, the right end of the first side 211 and the right end of the second side 212 are not connected.

[0058] Thus, the left area of ​​the weak space 21 (i.e., the area of ​​the weak space 21 close to the heat absorbing element 1) is wider, and the right area of ​​the weak space 21 (i.e., the area of ​​the weak space 21 away from the heat absorbing element 1) is narrower. When the gas passes through the weak space 21, the narrower part of the weak space 21 is subjected to greater pressure, so that the gas is easy to break through the connection between the first sealing layer 22 and the second sealing layer from the right side of the weak space 21 (i.e., the end of the weak space 21 away from the heat absorbing element 1), which helps the gas to quickly break through the connection between the first sealing layer 22 and the second sealing layer, thereby improving the performance of the heat exchange device 100. It should be noted that the shape of the first side 211 and the shape of the second side 212 can be a straight line, a wavy line or a step shape, and the shape of the first side 211 and the shape of the second side 212 can be the same or different, and the shape of the first side 211 and the shape of the second side 212 can be specifically set according to actual use conditions to better meet actual use. But it is not limited to this.

[0059] According to some embodiments of the present invention, referring to Figure 2 , one end of the first side edge 211 away from the heat absorbing member 1 is connected to one end of the second side edge 212 away from the heat absorbing member 1. Figure 2 In the example, the right end of the first side 211 (i.e., the end of the first side 211 away from the heat absorber 1) is connected to the right end of the second side 212 (i.e., the end of the second side 212 away from the heat absorber 1). With this arrangement, the right end of the weak space 21 (i.e., the end of the weak space 21 away from the heat absorber 1) is pointed, which further increases the pressure on the right end of the weak space 21, thereby making it more conducive for the gas to break through the connection between the first sealing layer 22 and the second sealing layer on the right side of the weak space 21, thereby further increasing the rate at which the gas breaks through the first sealing layer 22 and the second sealing layer. It should be noted that here, only the end of the first side 211 away from the heat absorber 1 is limited to be connected to the end of the second side 212 away from the heat absorber 1, and whether the first side 211 and the second side 212 are extended in a straight line or in a curve is not limited here.

[0060] According to some embodiments of the present invention, referring to Figure 2 The first side edge 211 has an inclination angle α relative to the corresponding edge of the seal 2 (i.e., the junction where the seal 2 forms the weak space 21 and communicates with the inside of the seal 2, i.e., the edge of the first sealing layer 22 and the second sealing layer where the corresponding weak space 21 is located and faces the heat absorbing element 1), wherein α satisfies: 5°≤α≤60°. For example, Figure 2 In the example, the first side 211 extends obliquely in the left-right direction, the corresponding edges of the seal 2 and the weak space 21 extend in the up-down direction, and the angle between the first side 211 and the corresponding edges of the seal 2 and the weak space 21 is α.

[0061] When the inclination angle α of the first side edge 211 relative to the corresponding edge of the seal 2 is less than 5°, the inclination angle of the first side edge 211 is small, and the first side edge 211 is roughly flush with the right side edge of the outer peripheral edge of the seal 2 (that is, the side of the seal 2 provided with the weak space 21), that is, the right end of the first side edge 211 (that is, the end of the first side edge 211 away from the heat absorption element 1) is relatively large from the right side edge of the outer peripheral edge of the seal 2, so that it is not easy for gas to break through the connection between the first sealing layer 22 and the second sealing layer at the weak space 21. When the inclination angle α of the first side edge 211 relative to the corresponding edge of the seal 2 is greater than 60°, the inclination angle of the first side edge 211 is relatively large, and the distance between the right end of the first side edge 211 and the right side of the outer peripheral edge of the seal 2 is relatively small. The force required for the gas to break through the connection between the first sealing layer 22 and the second sealing layer on the right side of the weak space 21 (i.e., the side of the weak space 21 away from the heat absorption element 1) is relatively small. Therefore, when the preset threshold value is not reached in the seal 2, the gas can break through the connection between the first sealing layer 22 and the second sealing layer at the weak space 21, which is not conducive to the normal use of the heat absorption element 1.

[0062] Therefore, by setting the inclination angle α of the first side 211 relative to the corresponding edge of the seal 2 to satisfy 5°≤α≤60°, the inclination angle of the first side 211 is reasonably set, so that the distance between the right end of the first side 211 (i.e., the end of the first side 211 away from the heat absorption component 1) and the right side of the outer peripheral edge of the first sealing layer 22 (i.e., the side of the first sealing layer 22 provided with the weak space 21) is reasonably set, thereby effectively ensuring that when the pressure in the seal 2 reaches a predetermined threshold, the gas can break through the connection between the first sealing layer 22 and the second sealing layer at the weak space 21, so that the heat exchange device 100 can be used normally.

[0063] According to some further embodiments of the present invention, referring to Figure 2 The inclination angle of the second side edge 212 relative to the corresponding edge of the seal 2 (that is, the junction where the seal 2 forms the weak space 21 and communicates with the inside of the seal 2, that is, the edge of the first sealing layer 22 and the second sealing layer where the corresponding weak space 21 is located and faces the heat absorbing element 1) is β, where β satisfies: 5°≤β≤60°. For example, in Figure 2 In the example, the second side 212 extends obliquely along the left-right direction toward the side away from the seal 2, and the corresponding edges of the seal 2 and the weak space 21 extend along the up-down direction, and the angle between the second side 212 and the corresponding edges of the seal 2 and the weak space 21 is β.

[0064] When the inclination angle β of the second side 212 relative to the corresponding edge of the seal 2 is less than 5°, the inclination angle of the second side 212 is small, and the second side 212 is roughly flush with the right side of the outer peripheral edge of the seal 2 (that is, the side of the seal 2 where the weak space 21 is formed), that is, the right end of the second side 212 (that is, the end of the second side 212 away from the heat absorption element 1) is relatively large from the right side of the outer peripheral edge of the seal 2, so that it is not easy for gas to break through the connection between the second sealing layer and the first sealing layer 22 at the weak space 21. When the inclination angle β of the second side 212 relative to the corresponding edge of the seal 2 is greater than 60°, the inclination angle of the second side 212 is relatively large, and the distance between the right end of the second side 212 and the right side of the outer peripheral edge of the seal 2 is relatively small. The force required for the gas to break through the connection between the second sealing layer and the first sealing layer 22 on the right side of the weak space 21 (i.e., the side of the weak space 21 where the heat absorption element 1 is provided) is relatively small. Therefore, when the preset threshold value is not reached in the seal 2, the gas can break through the connection between the second sealing layer and the first sealing layer 22 at the weak space 21, which is not conducive to the normal use of the heat absorption element 1.

[0065] Therefore, by setting the inclination angle β of the second side 212 relative to the corresponding edge of the seal 2 to satisfy 5°≤β≤60°, the inclination angle of the second side 212 is reasonably set, so that the distance between the right end of the second side 212 (i.e., the end of the second side 212 away from the heat absorption component 1) and the right side of the outer peripheral edge of the first sealing layer 22 (i.e., the side of the first sealing layer 22 where the weak space 21 is formed) is reasonably set, thereby effectively ensuring that when the pressure in the seal 2 reaches a predetermined threshold, the gas can break through the connection between the first sealing layer 22 and the second sealing layer at the weak space 21, so that the heat exchange device 100 can be used normally.

[0066] According to some other embodiments of the present invention, referring to Figure 2The inclination angle of the first side 211 relative to the corresponding edge of the seal 2 is α, and the inclination angle of the second side 212 relative to the corresponding edge of the seal 2 is β, wherein α and β respectively satisfy: 5°≤α≤60°, 5°≤β≤60°. Therefore, by setting the inclination angle α of the first side 211 relative to the corresponding edge of the sealing member 2 and the inclination angle β of the second side 212 relative to the corresponding edge of the sealing member 2 to satisfy 5°≤α≤60° and 5°≤β≤60° respectively, the inclination angle of the first side 211 and the inclination angle of the second side 212 are reasonably set, so that the distance between the right end of the first side 211 (i.e., the end of the first side 211 away from the heat absorption member 1) and the right side of the outer peripheral edge of the first sealing layer 22 (i.e., the side of the first sealing layer 22 formed with the weak space 21) is reasonably set, and the distance between the right end of the second side 212 (i.e., the end of the second side 212 away from the heat absorption member 1) and the right side of the outer peripheral edge of the first sealing layer 22 is reasonably set, thereby effectively ensuring that when the pressure in the sealing member 2 reaches a predetermined threshold, the gas can break through the connection between the first sealing layer 22 and the second sealing layer at the weak space 21, so that the heat exchange device 100 can be used normally.

[0067] According to some embodiments of the present invention, referring to Figure 2 , the projection shape of the weak space 21 on the first sealing layer 22 is a triangle. Therefore, the right end of the weak space 21 (i.e., the end of the weak space 21 away from the heat absorbing element 1) can be a sharp angle, which can ensure that the sharp angle is subjected to a larger force, making it easy for the gas to break through the connection between the first sealing layer 22 and the second sealing layer at the weak space 21, simplifying the structure of the weak space 21, reducing the difficulty of producing the weak space 21, and facilitating improving the production rate of the heat exchange device 100.

[0068] Further, refer to Figure 2 , the projection shape of the weak space 21 on the first sealing layer 22 is an equilateral triangle. With such a configuration, since the two equal sides in the equilateral triangle, namely the first side 211 and the second side 212, are subjected to uniform force, it is more conducive to the gas flowing to the connection between the first side 211 and the second side 212, so that the gas can more easily break through the connection between the first sealing layer 22 and the second sealing layer at the weak space 21. In addition, the first side 211 and the second side 212 extend in a straight line, which simplifies the structure of the weak space 21 and is more conducive to the production and processing of the heat exchange device 100.

[0069] According to some embodiments of the utility model, the heat absorbing element 1 is a phase change material element. For example, the phase change material element can change the state of matter without changing the temperature and can provide latent heat. In the process of changing the state of matter, the phase change material element can absorb or release a large amount of latent heat, thereby helping the heat absorbing element 1 to absorb the heat on the battery cell in the process of changing the state, so as to cool the battery cell, thereby helping the battery assembly to be used normally for a long time and extending the service life of the battery cell. It should be noted that the phase change material element can be a phase change material element for liquid-gas conversion or a phase change material element for solid-gas conversion to better meet practical applications.

[0070] Furthermore, the phase change material is a hydrogel or water. For example, when the phase change material is a hydrogel, the hydrogel can swell and retain a large amount of water. As a heat-absorbing material, the hydrogel can use the water retained by the hydrogel to take away a large amount of heat generated inside the battery cell during the heating and vaporization process, so that the phase change material can absorb the heat of the battery cell and cool the battery cell. When the phase change material is water, water has no fixed shape, which is convenient for changing shape according to actual use, thereby increasing the scope of application of the phase change material.

[0071] Optionally, the seal 2 is made of a polymer material, and the outer peripheral edge of the first sealing layer 22 and the outer peripheral edge of the second sealing layer are sealed by hot pressing. As a result, the polymer has insulation, heat resistance, corrosion resistance and easy processing, thereby extending the service life of the seal 2, reducing the processing difficulty of the seal 2, and reducing the processing cost of the seal 2. In addition, the hot pressing sealing operation is simple, which helps to increase the production rate of the heat exchange device 100.

[0072] Optionally, the heat exchange device 100 may be provided with a plurality of weak spaces 21. In the description of the present utility model, "plurality" means two or more. This arrangement facilitates the selection of the number of weak spaces 21 according to actual conditions, thereby improving the performance of the heat exchange device 100. It should be noted that the number and arrangement of the plurality of weak spaces 21 may be set according to actual conditions.

[0073] According to the battery assembly (not shown) of the embodiment of the second aspect of the utility model, it includes a plurality of battery cells (not shown) and at least one heat exchange device 100. The plurality of battery cells are arranged in sequence, and the heat exchange device 100 is the heat exchange device 100 according to the embodiment of the first aspect of the utility model, and the heat exchange device 100 is arranged between two adjacent battery cells. For example, a plurality of heat exchange devices 100 are provided, and the plurality of battery cells are arranged in sequence along the thickness direction of the battery cells, and a heat exchange device 100 is provided between each two adjacent battery cells. With such a configuration, when the temperature of the battery cell rises, the heat of the battery cell can be absorbed by the heat exchange device 100, so that the temperature of the battery cell is reduced, thereby facilitating the normal use of the battery cell for a long time, thereby extending the service life of the battery assembly.

[0074] According to some embodiments of the utility model, the weak space 21 of the heat exchange device 100 is close to the side of the battery cell where the explosion-proof valve (not shown) is provided. For example, the side of the heat exchange device 100 where the weak space 21 is located is the same side as the side of the battery cell where the explosion-proof valve is located. In this way, the position of the weak space 21 is reasonably set, which is conducive to the exhaust of the battery assembly, thereby facilitating the normal use of the battery assembly. In addition, during the assembly of the battery assembly, it is easy to distinguish the installation direction of the heat exchange device 100, which helps to improve the installation efficiency of the heat exchange device 100 and the battery cell, thereby improving the installation efficiency of the battery assembly.

[0075] The battery pack (not shown) according to the third embodiment of the utility model includes the heat exchange device 100 according to the first embodiment of the utility model, or the battery assembly according to the second embodiment of the utility model.

[0076] According to the battery pack of the present invention, by adopting the above-mentioned heat exchange device 100 or the above-mentioned battery assembly, it is helpful to reduce the temperature of the battery pack, which is beneficial to the heat dissipation of the battery pack, thereby extending the service life of the battery pack.

[0077] According to the fourth aspect of the utility model, the power consumption system (not shown) includes the battery pack according to the third aspect of the utility model.

[0078] According to the power consumption system of the utility model, by adopting the above-mentioned battery pack, the performance of the power consumption system is improved. For example, the power consumption system can be a vehicle, an aircraft, a ship, a computer or an energy storage device, but it is not limited thereto.

[0079] Other structures and operations of the battery assembly, battery pack and power system according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0080] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "left", "right", "inside", "outside", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0082] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A heat exchange device, characterized in that: include: Heat absorbing parts; A sealing member, wherein the sealing member is coated outside the heat absorbing member, the sealing member has at least one weak space, and the sealing member is configured to break when the pressure inside the sealing member reaches a preset threshold value, and an area of ​​a side of the weak space adjacent to the heat absorbing member is greater than an area of ​​a side of the weak space away from the heat absorbing member.

2. The heat exchange device according to claim 1, characterized in that: The sealing element comprises: A first sealing layer; A second sealing layer, wherein the second sealing layer is arranged on one side of the thickness direction of the first sealing layer, the outer periphery of the second sealing layer is connected to the outer periphery of the first sealing layer to form a receiving cavity, the heat absorbing component is located in the receiving cavity, and the outer periphery of the second sealing layer and the outer periphery of the first sealing layer jointly define the weak space.

3. The heat exchange device according to claim 2, characterized in that: The weak space is in communication with the accommodating cavity; or The weak space is separated from the accommodating cavity, and a connection force between an outer periphery of the first sealing layer and an outer periphery of the second sealing layer on a side of the weak space facing the heat absorbing component is smaller than a connection force between an outer periphery of the first sealing layer and an outer periphery of the second sealing layer in a remaining part except the weak space.

4. The heat exchange device according to claim 2, characterized in that: A side of the weak space adjacent to the heat absorbing element is open and communicated with the accommodating cavity.

5. The heat exchange device according to claim 2, characterized in that: The connection width between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer in the remaining part except the weak space is a, and the minimum distance between the side of the weak space away from the heat absorption component and the outer periphery of the sealing component is b, wherein b satisfies: 0.2a<b<0.8a.

6. The heat exchange device according to claim 2, characterized in that: The connection width between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer in the remaining part except the weak space is a, wherein a satisfies: 2mm≤a≤10mm.

7. The heat exchange device according to claim 2, characterized in that: The projection of the weak space on the first sealing layer has a first side and a second side, and the distance between the first side and the second side decreases from a side of the weak space adjacent to the heat absorbing element toward a side of the weak space away from the heat absorbing element.

8. The heat exchange device according to claim 7, characterized in that: One end of the first side away from the heat absorption component is connected to one end of the second side away from the heat absorption component.

9. The heat exchange device according to claim 7, characterized in that: The inclination angle of the first side relative to the corresponding edge of the seal is α, wherein α satisfies: 5°≤α≤60°; and / or The inclination angle of the second side relative to the corresponding edge of the seal is β, wherein β satisfies: 5°≤β≤60°.

10. The heat exchange device according to claim 2, characterized in that: The projection shape of the weak space on the first sealing layer is a triangle.

11. The heat exchange device according to claim 2, characterized in that: The projection shape of the weak space on the first sealing layer is an equilateral triangle.

12. The heat exchange device according to any one of claims 1 to 11, characterized in that: The heat absorbing element is a phase change material element.

13. The heat exchange device according to claim 12, characterized in that: The phase change material is hydrogel or water.

14. A battery assembly, characterized in that: include: A plurality of battery cells, wherein the plurality of battery cells are arranged in sequence; At least one heat exchange device, wherein the heat exchange device is a heat exchange device according to any one of claims 1 to 13, and the heat exchange device is arranged between two adjacent battery cells.

15. The battery assembly according to claim 14, characterized in that: The weak space of the heat exchange device is close to the side of the battery core where the explosion-proof valve is provided.

16. A battery pack, characterized in that: The invention comprises a heat exchange device according to any one of claims 1 to 13, or a battery assembly according to claim 14 or 15.

17. An electricity system, characterized in that: Comprising the battery pack according to claim 16.

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