Heat exchange device, battery assembly, battery pack and electric system

Abstract

Disclosed in the present application are a heat exchange device, a battery assembly, a battery pack and an electric system. The heat exchange device comprises a heat-absorbing member and a sealing member, wherein the sealing member is wrapped around the heat-absorbing member, is provided with at least one weak space, and is configured to break open at the position on the sealing member near the weak space when the pressure in the sealing member reaches a preset threshold value, and the area of the side of the weak space close to the heat-absorbing member is greater than the area of the side of the weak space away from the heat-absorbing member. On the basis of the heat exchange device of the present application, the heat-absorbing member can absorb heat of battery cells, and the weak space facilitates the emission of a gas in the sealing member, so as to facilitate the use of the heat exchange device.

Description

Heat exchange devices, battery components, battery packs and power systems

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 6, 2024, with application number 202420434186.0 and application name “Heat exchange device, battery assembly, battery pack and power system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a heat exchange device, a battery assembly, a battery pack, and a power system. Background Art

[0003] Battery components generate a large amount of heat during operation, which may cause thermal runaway of the battery cells, thereby affecting the use of the battery cells.

[0004] To suppress heat spread during thermal runaway, aerogels are commonly used to slow the thermal diffusion of battery cells. However, aerogels can only slow the transfer of heat and are unable to effectively absorb the large amounts of heat released from the battery assembly. Heat exchangers containing aerogels are sandwiched between the large surfaces of two adjacent battery cells. When thermal runaway occurs, the heat exchangers are squeezed by the cells, potentially exposing them to damage or deformation. Summary of the Invention

[0005] One purpose of the present application is to provide a heat exchange device, wherein the heat absorbing component can absorb the heat of the battery cell, and the weak space is conducive to the discharge of the gas in the seal, so as to facilitate the use of the heat exchange device.

[0006] The second object of the present application is to provide a battery assembly using the above-mentioned heat exchange device.

[0007] The third object of the present application is to provide a battery pack using the above-mentioned heat exchange device or the above-mentioned battery assembly.

[0008] The fourth objective of this application is to provide an electricity system using the above-mentioned battery pack.

[0009] According to an embodiment of the first aspect of the present application, a heat exchange device includes: a heat absorbing element; and a sealing element, wherein the sealing element is covered on the outside of the heat absorbing element, the sealing element having at least one weak space, the sealing element being configured to break adjacent to the weak space when the pressure within the sealing element reaches a preset threshold, and the area of ​​the weak space adjacent to the heat absorbing element is larger than the area of ​​the weak space away from the heat absorbing element.

[0010] According to the heat exchange device of the present application, the heat absorbing element vaporizes when absorbing heat. When the pressure in the seal reaches a preset threshold, the gas can break through the weak space and move away from the side of the heat absorbing element, thereby allowing the gas to be smoothly discharged outside the seal, avoiding the heat absorbing element from exploding or the gas in the chamber from flowing randomly, thereby facilitating the normal use of the heat exchange device. Moreover, by providing the weak space, the gas exhaust channel is easily opened under the action of the pressure in the seal, thereby facilitating the gas to be preferentially discharged from the weak space. In addition, the heat absorbed from the battery assembly by vaporization of the heat absorbing element helps to cool the battery assembly, thereby helping to extend the service life of the battery assembly. In addition, by providing the weak space with an area change 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 at which the gas breaks through the seal.

[0011] According to some embodiments of the present application, the sealing component includes: a first sealing layer; a second sealing layer, 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 and forms 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.

[0012] According to some embodiments of the present application, 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 absorber 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.

[0013] According to some embodiments of the present application, a side of the weak space adjacent to the heat absorption component is open and communicated with the accommodating cavity.

[0014] According to some embodiments of the present application, 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 element and the outer periphery of the sealing element is b, wherein b satisfies: 0.2a<b<0.8a.

[0015] According to some embodiments of the present application, the connection width between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer in the remaining portion excluding the weak space is a, wherein a satisfies: 2mm≤a≤10mm.

[0016] According to some embodiments of the present application, a projection of the weak space on the first sealing layer has a first side edge and a second side edge, and the distance between the first side edge and the second side edge decreases from a side of the weak space adjacent to the heat absorption element toward a side of the weak space away from the heat absorption element.

[0017] According to some embodiments of the present application, an end of the first side away from the heat absorption element is connected to an end of the second side away from the heat absorption element.

[0018] According to some embodiments of the present application, 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°.

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

[0020] According to some embodiments of the present application, a projection shape of the weak space on the first sealing layer is an equilateral triangle.

[0021] According to some embodiments of the present application, the heat absorption element is a phase change material element.

[0022] According to some embodiments of the present application, the phase change material piece is hydrogel or water.

[0023] According to the battery assembly of the second embodiment of the present application, it includes: multiple battery cells, which are arranged in sequence; at least one heat exchange device, which is the heat exchange device according to the first embodiment of the present application, and is arranged between two adjacent battery cells.

[0024] According to some embodiments of the present application, the weak space of the heat exchange device is close to a side of the battery cell where an explosion-proof valve is provided.

[0025] According to the battery pack according to the third aspect embodiment of the present application, according to the heat exchange device according to the above-mentioned first aspect embodiment of the present application, or according to the battery assembly according to the above-mentioned second aspect embodiment of the present application.

[0026] According to the fourth embodiment of the present application, the power consumption system includes the battery pack according to the third embodiment of the present application.

[0027] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] FIG1 is a schematic diagram of a heat exchange device according to an embodiment of the present application, wherein the second sealing layer is not shown;

[0030] FIG2 is an enlarged view of the circled portion A in FIG1 .

[0031] Reference numerals: 100, heat exchange device; 1, heat absorbing element; 2, sealing element; 21, weak space; 211, first side edge; 212, second side edge; 22, first sealing layer. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The heat exchange device 100 according to the embodiment of the first aspect of the present application is described below with reference to Figures 1 and 2. The heat exchange device 100 of the present application is described in detail by taking its use in a battery assembly as an example.

[0033] As shown in FIG1 and FIG2 , the heat exchange device 100 according to the embodiment of the first aspect of the present application includes a heat absorbing component 1 and a sealing component 2 .

[0034] Specifically, the seal 2 is wrapped around the heat absorber 1 and has at least one weak space 21. The seal 2 is configured to break open adjacent to the weak space 21 when the pressure within the seal 2 reaches a preset threshold. The area of ​​the weak space 21 adjacent to the heat absorber 1 is larger than the area of ​​the weak space 21 away from the heat absorber 1.

[0035] For example, in the examples of Figures 1 and 2 , when seal 2 is in a sealed state, heat sink 1 is located within seal 2, and the interior of seal 2 is not connected to the exterior. The cross-sectional area of ​​weak space 21 along the thickness direction (e.g., perpendicular to the surface of seal 2 in Figure 1 ) on the side adjacent to heat sink 1 is greater than the cross-sectional area of ​​weak space 21 along the thickness direction away from heat sink 1. When the pressure within seal 2 reaches a predetermined threshold, seal 2 ruptures adjacent to weak space 21, allowing the interior of seal 2 to communicate with the exterior of seal 2 through weak space 21. It should be noted that when the thickness of weak space 21 is negligible, the length of weak space 21 on the side adjacent to heat sink 1 (e.g., the vertical dimension in Figure 1 ) is greater than the length of weak space 21 on the side away from heat sink 1. As shown in Figure 1 , weak space 21 is formed at the right edge of seal 2. However, weak space 21 can also be formed at other edges of seal 2. The sealing member 2 has an accommodating cavity (not shown) inside, and the accommodating cavity is used to accommodate the heat absorbing member 1 .

[0036] With such a configuration, 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 experiences thermal runaway. The heat absorption element 1 quickly absorbs the heat and vaporizes to produce 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 (in other words, when the pressure in the weak space 21 reaches a preset threshold), 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. 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 chaotic flow of gas inside the seal 2, and thus facilitating the normal use of the heat exchange device 100. Furthermore, the provision of weak space 21 facilitates the opening of a gas exhaust passage (i.e., a communication passage between weak space 21 and the exterior of seal 2) under pressure, thereby facilitating the preferential discharge of gas from seal 2 through weak space 21. Furthermore, heat sink 1 absorbs a significant amount of heat during vaporization, thereby absorbing heat from the battery cells, reducing the battery assembly's temperature and facilitating prolonged, normal use of the battery assembly.

[0037] Furthermore, the larger area of ​​the weak space 21 on the side adjacent to the heat sink 1 facilitates the flow of gas within the seal 2 toward the weak space 21. The smaller area of ​​the weak space 21 on the side distal to the heat sink 1 increases the pressure on this side of the weak space 21, enhancing the stress concentration on this side, thereby facilitating gas breakthrough through the seal 2 and escape. Furthermore, the change in area of ​​the weak space 21 from the side adjacent to the heat sink 1 toward the side distal to the heat sink 1 guides the flow of gas, facilitating smooth gas flow from the side of the weak space 21 adjacent to the heat sink 1 to the side distal to the heat sink 1. This improves the smoothness of gas flow and increases the speed at which gas breaks through the seal 2.

[0038] According to the heat exchange device 100 of the present application, the heat absorbing element 1 vaporizes upon absorbing heat. When the pressure within the seal 2 reaches a preset threshold, the gas can break through the weak space 21 away from the heat absorbing element 1, allowing the gas to be smoothly discharged outside the seal 2. This prevents the heat absorbing element 1 from exploding or gas from escaping the seal 2 (i.e., the chamber), thereby facilitating the normal operation of the heat exchange device 100. Furthermore, the provision of the weak space 21 facilitates the opening of the gas exhaust channel under the action of the pressure within the seal 2, thereby facilitating the preferential discharge of the gas from the weak space 21. Furthermore, the heat absorbing element 1 vaporizes and absorbs heat from the battery assembly, helping to cool the battery assembly and thereby extending the battery assembly's service life. Furthermore, by providing the weak space 21 with a changing area from the side adjacent to the heat absorbing element 1 toward the side away from the heat absorbing element 1, the gas is facilitated from breaking through the seal 2 and the smoothness of gas flow is improved, thereby increasing the speed at which the gas breaks through the seal 2.

[0039] According to some embodiments of the present application, referring to FIG. 1 , the sealing member 2 includes a first sealing layer 22 and a second sealing layer (not shown).

[0040] Specifically, the second sealing layer is arranged on one side of the thickness direction of the first sealing layer 22, and the outer periphery of the second sealing layer is connected to the outer periphery of the first sealing layer 22 to form an accommodating cavity (not shown in the figure). The heat absorbing 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.

[0041] For example, in the example of FIG1 , the heat sink 1 is located in the middle region 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 sink 1 is located in the sealed region (i.e., the accommodating cavity) formed between the first sealing layer 22 and the second sealing layer. The heat sink 1 is located in the accommodating cavity, and the sealing member 2 encloses the heat sink 1. The weak space 21 is located at the junction of the outer peripheral edges of the first sealing layer 22 and the outer peripheral edges of the second sealing layer. The outer peripheral edges of the second sealing layer and the outer peripheral edges of the first sealing layer 22 are not connected to each other, and the weak space 21 is defined by the outer peripheral edges of the second sealing layer and the outer peripheral edges of the first sealing layer 22. In other words, the outer peripheral edges of the first sealing layer 22 and the outer peripheral edges of the second sealing layer are pressed together to connect, and the portion of the first sealing layer 22 and the outer peripheral edges of the second sealing layer at the weak space 21 are not connected. The width of the connection between the outer peripheral edges of the second sealing layer and the outer peripheral edges of the first sealing layer 22 at the weak space 21 is less than the width of the connection between the outer peripheral edges of the second sealing layer and the outer peripheral edges of the first sealing layer 22 outside of the weak space 21.

[0042] With such a configuration, 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 element 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 reduced, and the space for placing the heat-absorbing element 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 description of the left and right positions in this application refers to the left and right directions indicated by the arrows in Figure 1. 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.

[0043] According to some optional embodiments of the present application, the first sealing layer 22 and the second sealing layer are integrally formed. This strengthens the connection strength between the outer periphery of the first sealing layer 22 and the outer periphery of the second sealing layer. It should be noted that the seal 2 can be injection molded using a mold having a protruding structure. After removing the remaining portion of the mold, the seal 2 is formed. The protruding structure forms the accommodating cavity and the weak space 21 at the position corresponding to the seal 2.

[0044] According to some embodiments of the present application, referring to FIG1 , the weak space 21 is connected to the accommodating cavity (i.e., the interior of the seal 2). For example, in the example of FIG1 , when the seal 2 is in a sealed state, the heat absorber 1 is located within the accommodating cavity, which is connected to the weak space 21, but not to the exterior of the seal 2. With this arrangement, the heat absorber 1 rapidly absorbs heat and vaporizes to produce a large amount of gas. The pressure of the gas in the seal 2 increases sharply, and the gas in the accommodating cavity flows into the weak space 21, then breaks through the adjacent weak space 21 of the seal 2 to flow out. This facilitates the flow of gas to the weak space 21, improves the smoothness of gas flow between the accommodating cavity and the weak space 21, and further facilitates the normal use of the heat exchange device 100.

[0045] According to other embodiments of the present application, 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.

[0046] 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 absorber 1, thereby separating the weak space 21 from the accommodating chamber. When the pressure in the accommodating chamber (i.e., the interior of the sealing member 2) reaches a predetermined threshold, the gas first breaks through the connection 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, and then flows into the weak space 21 to break through the connection 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 absorber 1. This buffers the pressure of the gas flowing into the weak space 21, preventing damage to other parts of the sealing member 2 due to the high gas pressure during the process of breaking through the sealing member 2, thereby helping to improve the recycling efficiency 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 along a 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 .

[0047] According to some embodiments of the present application, referring to FIG1 , the side of weak space 21 adjacent to heat absorber 1 is open and communicates with the accommodating cavity (i.e., the space where heat absorber 1 is located). For example, in the example of FIG1 , the left side of weak space 21 (i.e., the side of weak space 21 adjacent to heat absorber 1) communicates with the accommodating cavity (i.e., the space where heat absorber 1 is located). This arrangement allows the gas generated by vaporization of heat absorber 1 to flow from the accommodating cavity into weak space 21, thereby facilitating the gas flow through weak space 21 and breaking through the connection between first sealing layer 22 and second sealing layer, thus reducing the difficulty of gas exhaust, thereby facilitating the normal operation of heat exchange device 100 and increasing the exhaust speed of heat exchange device 100.

[0048] According to some embodiments of the present application, referring to Figures 1 and 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 portion excluding the weak space 21 is a, and the minimum distance between the side of the weak space 21 away from the heat absorber 1 and the outer periphery of the sealing member 2 (i.e., the circumferential edge of the sealing member 2) is b, where b satisfies the following: 0.2a<b<0.8a.

[0049] For example, when the minimum distance b between the side of the weak space 21 away from the heat absorbing element 1 and the outer periphery of the sealing element 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 portion excluding the weak space 21, the minimum distance between the side of the weak space 21 away from the heat absorbing element 1 and the outer periphery of the sealing element 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 absorbing element 1) is narrow. Therefore, when the pressure in the sealing element 2 does not reach a preset threshold, gas can break through the connection on the right side of the weak space 21, causing the gas to flow out of the sealing element 2, affecting the normal use of the heat absorbing element 1, thereby reducing the heat absorption capacity of the heat absorbing element 1, and making it difficult to cool the battery assembly.

[0050] When 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 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 portion excluding 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 absorber 1) is wider. When the pre-threshold value is reached in the seal 2, it is difficult 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 making it easy for the seal 2 to explode or for gas to flow randomly within 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.

[0051] 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 excluding the weak space 21, and 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 to meet 0.2a<b<0.8a, 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, effectively ensuring that before the air pressure in the seal 2 reaches a preset threshold, the gas is unlikely 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), thereby allowing the heat absorber 1 to continue to be used normally to absorb heat from the battery assembly, avoiding thermal runaway of the battery assembly, and improving the utilization rate of the heat absorber 1. In addition, it also effectively ensures 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 the seal 2 from easily exploding or gas from flowing randomly 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.

[0052] According to some embodiments of the present application, with reference to FIG2 , the width of the connection between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22 in the remaining portion excluding the weak space 21 is a, where a satisfies the following conditions: 2 mm ≤ a ≤ 10 mm. For example, when the width a of the connection between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22 in the remaining portion excluding the weak space 21 is less than 2 mm, the width of the connection between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22 in the remaining portion excluding the weak space 21 is relatively narrow, which can easily result in a poor seal 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 seal 2 and making the seal 2 susceptible to damage. When the connection width a between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22, excluding 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, excluding the weak space 21, is relatively wide. 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 sink 1) is also relatively wide, reducing the space inside the sealing member 2, thereby reducing the capacity of the heat sink 1 and the amount of heat absorbed by the heat sink 1, which is detrimental to heat dissipation of the battery assembly. Furthermore, unnecessary material is wasted, reducing the material utilization rate of the sealing member 2.

[0053] Thus, by ensuring that the width a between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22, excluding the weak space 21, satisfies 2mm≤a≤10mm, the width of the connection between the outer periphery of the second sealing layer and the outer periphery of the first sealing layer 22, excluding the weak space 21, is appropriately set, thereby improving the yield rate of the edge sealing between the second sealing layer and the first sealing layer 22. This ensures that the edge sealing between the second sealing layer and the first sealing layer 22 is free of bubbles and wrinkles, improves the sealing performance of the seal 2, effectively prevents contact between the heat absorber 1 and the seal 2, and thus facilitates the normal operation of the heat exchange device 100. Furthermore, the increased space within the seal 2 allows for increased usage of the heat absorber 1, increases the amount of heat absorbed by the heat absorber 1, or prolongs the service life of the heat absorber 1, thereby improving the performance of the heat exchange device 100. Furthermore, material waste of the seal 2 is avoided, thereby improving the material utilization rate of the seal 2.

[0054] According to some embodiments of the present application, referring to Figures 1 and 2 , the projection of the weak space 21 on the first sealing layer 22 includes a first side 211 and a second side 212. The distance between the first side 211 and the second side 212 decreases from the side of the weak space 21 adjacent to the heat sink 1 toward the side of the weak space 21 away from the heat sink 1. For example, in the examples of Figures 1 and 2 , the first side 211 and the second side 212 approach each other from left to right. This gradually decreasing distance between the first side 211 and the second side 212 includes the following situations: First, the first side 211 extends generally horizontally from left to right, while the second side 212 extends upwardly and obliquely from left to right. Second, the first side 211 extends downwardly and obliquely from left to right, while the second side 212 extends generally horizontally and obliquely from left to right. Third, the first side 211 extends downwardly and obliquely from left to right, while the second side 212 extends upwardly and obliquely from left to right. In addition, the first side 211 and the second side 212 may be arranged in the following manner: first, the right end of the first side 211 (i.e., the end of the first side 211 away from the heat sink 1) and the right end of the second side 212 (i.e., the end of the second side 212 away from the heat sink 1) are connected. Second, the right end of the first side 211 and the right end of the second side 212 are not connected.

[0055] As a result, the left side of the weak space 21 (i.e., the area of ​​the weak space 21 close to the heat absorber 1) is wider, while the right side of the weak space 21 (i.e., the area of ​​the weak space 21 away from the heat absorber 1) is narrower. When gas passes through the weak space 21, the narrower area of ​​the weak space 21 is subjected to greater pressure, making it easier for the gas 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 absorber 1). This helps the gas 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 second side 212 can be straight, wavy, or stepped, and the shapes of the first side 211 and the second side 212 can be the same or different. The shapes of the first side 211 and the second side 212 can be specifically configured according to actual usage to better meet actual needs, but are not limited to these.

[0056] According to some embodiments of the present application, referring to FIG. 2 , the end of the first side 211 away from the heat sink 1 is connected to the end of the second side 212 away from the heat sink 1. For example, in the example of FIG. 2 , the right end of the first side 211 (i.e., the end of the first side 211 away from the heat sink 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 sink 1). This configuration gives the right end of the weak space 21 (i.e., the end of the weak space 21 away from the heat sink 1) a sharp angle, further increasing the pressure on the right end of the weak space 21. This further facilitates gas penetration of 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 gas penetrates 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 absorption element 1 is limited to the end of the second side 212 away from the heat absorption element 1 being connected, and whether the first side 211 and the second side 212 extend in a straight line or in a curve is not limited here.

[0057] According to some embodiments of the present application, referring to FIG2 , the first side edge 211 is inclined at an angle α relative to a corresponding edge of the seal 2 (i.e., the junction where the seal 2 forms the weak space 21 and communicates with the interior of the seal 2, i.e., the edge of the first sealing layer 22 and the second sealing layer corresponding to the weak space 21, facing the heat sink 1). Here, α satisfies the following conditions: 5° ≤ α ≤ 60°. For example, in the example of FIG2 , the first side edge 211 extends obliquely in the left-right direction, and the corresponding edges of the seal 2 and the weak space 21 extend in the up-down direction. The angle between the first side edge 211 and the corresponding edges of the seal 2 and the weak space 21 is α.

[0058] When the inclination angle α of the first side 211 relative to the corresponding edge of the sealing member 2 is less than 5°, the inclination angle of the first side 211 is relatively small, and the first side 211 is roughly flush with the right side of the outer peripheral edge of the sealing member 2 (i.e., the side of the sealing member 2 provided with the weak space 21). In other words, the right end of the first side 211 (i.e., the end of the first side 211 away from the heat absorber 1) is relatively far away from the right side of the outer peripheral edge of the sealing member 2, thereby making it difficult for gas to break through the connection between the first sealing layer 22 and the second sealing layer in the weak space 21. When the inclination angle α of the first side 211 relative to the corresponding edge of the seal 2 is greater than 60°, the inclination angle of the first side 211 is large, and the distance between the right end of the first side 211 and the right side of the outer peripheral edge of the seal 2 is 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 absorber 1) is 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 in the weak space 21, which is not conducive to the normal use of the heat absorber 1.

[0059] 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 (that is, 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 (that is, the side of the first sealing layer 22 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.

[0060] According to some further embodiments of the present application, referring to FIG2 , the inclination angle of the second side 212 relative to the corresponding edge of the seal 2 (that is, the junction where the seal 2 is formed with the weak space 21 and is connected to the interior of the seal 2, that is, the edge of the side facing the heat absorber 1 where the corresponding weak space 21 of the first sealing layer 22 and the second sealing layer is located) is β, where β satisfies: 5°≤β≤60°. For example, in the example of FIG2 , 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.

[0061] When the inclination angle β of the second side 212 relative to the corresponding edge of the sealing member 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 sealing member 2 (i.e., the side of the sealing member 2 where the weak space 21 is formed). In other words, the right end of the second side 212 (i.e., the end of the second side 212 away from the heat-absorbing element 1) is relatively far away from the right side of the outer peripheral edge of the sealing member 2, thereby making it difficult for gas to break through the connection between the second sealing layer and the first sealing layer 22 in the weak space 21. When the inclination angle β of the second side 212 relative to the corresponding edge of the sealing member 2 is greater than 60°, the inclination angle of the second side 212 is large, and the distance between the right end of the second side 212 and the right side of the outer peripheral edge of the sealing member 2 is 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 absorbing member 1 is provided) is small. Therefore, when the preset threshold value is not reached in the sealing member 2, the gas can break through the connection between the second sealing layer and the first sealing layer 22 in the weak space 21, which is not conducive to the normal use of the heat absorbing member 1.

[0062] Therefore, by setting the inclination angle β of the second side 212 relative to the corresponding edge of the seal 2 to meet 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 (that is, 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 (that is, 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.

[0063] According to some other embodiments of the present application, referring to Figure 2, the 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 where the weak space 21 is formed) 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.

[0064] According to some embodiments of the present application, referring to FIG2 , the projection of weak space 21 onto first sealing layer 22 is triangular. This allows the right end of weak space 21 (i.e., the end of weak space 21 away from heat sink 1) to be sharp. This ensures that the sharp corner is subjected to greater force, making it easier for gas to break through the connection between first sealing layer 22 and second sealing layer at weak space 21. This also simplifies the structure of weak space 21, reduces the difficulty of manufacturing weak space 21, and facilitates increasing the production rate of heat exchange device 100.

[0065] Furthermore, referring to Figure 2 , the projection of the weak space 21 onto the first sealing layer 22 is shaped like an equilateral triangle. This configuration allows for uniform force on the two equal sides of the equilateral triangle, namely the first side 211 and the second side 212. This facilitates gas flow to the junction of the first side 211 and the second side 212, making it easier for gas to break through the connection between the first and second sealing layers in the weak space 21. Furthermore, the straight lines of the first and second sides 211, 212 simplify the structure of the weak space 21, further facilitating the production and processing of the heat exchange device 100.

[0066] According to some embodiments of the present application, heat sink 1 is a phase-change material. For example, a phase-change material can change state while maintaining a constant temperature and provide latent heat. During this process, the phase-change material can absorb or release a significant amount of latent heat. This helps heat sink 1 absorb heat from the battery cell during the state change, cooling the cell. This, in turn, helps the battery assembly function properly for extended periods of time, extending the lifespan of the cell. It should be noted that the phase-change material can be a liquid-to-gas phase-change material or a solid-to-gas phase-change material to better meet practical applications.

[0067] Furthermore, the phase-change material element is a hydrogel or water. For example, when the phase-change material element is a hydrogel, the hydrogel can swell and retain a large amount of water. As a heat-absorbing material, the water retained by the hydrogel can remove the large amount of heat generated within the battery cell during the heating and vaporization process. Thus, the phase-change material element can absorb the heat from the battery cell, thereby cooling the battery cell. When the phase-change material element is water, it has no fixed shape, making it easy to change shape according to actual usage, thereby expanding the applicability of the phase-change material element.

[0068] Optionally, the seal 2 is made of a polymer material, and the outer edges of the first sealing layer 22 and the second sealing layer are sealed by heat pressing. The polymer is insulating, heat-resistant, corrosion-resistant, and easy to process, thereby extending the service life of the seal 2 and reducing the difficulty and cost of manufacturing the seal 2. Furthermore, the heat pressing sealing operation is simple, thereby helping to increase the production rate of the heat exchange device 100.

[0069] Optionally, the heat exchange device 100 may be provided with multiple weak spaces 21. In this application, "multiple" means two or more. This arrangement facilitates selecting the number of weak spaces 21 based on actual conditions, thereby improving the performance of the heat exchange device 100. It should be noted that the number and arrangement of the multiple weak spaces 21 can be adjusted based on actual usage.

[0070] According to the battery assembly (not shown) of the embodiment of the second aspect of the present application, 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 present application, and the heat exchange device 100 is provided between two adjacent battery cells. For example, there are a plurality of heat exchange devices 100, 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 an arrangement, 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.

[0071] According to some embodiments of the present application, 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 located. 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.

[0072] The battery pack (not shown) according to the third embodiment of the present application includes the heat exchange device 100 according to the first embodiment of the present application, or the battery assembly according to the second embodiment of the present application.

[0073] According to the battery pack of the present application, by adopting the above-mentioned heat exchange device 100 or the above-mentioned battery assembly, it helps 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.

[0074] According to the fourth embodiment of the present application, the power consumption system (not shown) includes a battery pack according to the third embodiment of the present application.

[0075] The power system of the present application utilizes the aforementioned battery pack to improve the performance of the power system. For example, the power system may be a vehicle, aircraft, ship, computer, or energy storage device, but is not limited thereto.

[0076] Other structures and operations of the battery assembly, battery pack and power system according to the embodiments of the present application are known to ordinary technicians in this field and will not be described in detail here.

[0077] In the description of this application, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "left", "right", "inside", "outside", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be understood as limitations on this application.

[0078] Throughout this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" mean that a specific feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0079] Although the embodiments of the present application 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 intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A heat exchange device (100), comprising: Heat absorbing element (1); A sealing member (2), the sealing member (2) being covered on the outside of the heat absorbing member (1), the sealing member (2) having at least one weak space (21), the sealing member (2) being configured to break open at a position adjacent to the weak space (21) when the pressure within the sealing member (2) reaches a preset threshold value, and the area of ​​the side of the weak space (21) adjacent to the heat absorbing member (1) being larger than the area of ​​the side of the weak space (21) away from the heat absorbing member (1).

2. The heat exchange device (100) according to claim 1, wherein the sealing member comprises: a first sealing layer (22); A second sealing layer, wherein the second sealing layer is arranged on one side of the first sealing layer (22) in the thickness direction, 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 element (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 the weak space (21).

3. The heat exchange device (100) according to claim 2, wherein the weak space (21) is connected to the accommodating cavity; or The weak space (21) is separated from the accommodating cavity, 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 facing the heat absorbing element (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).

4. The heat exchange device (100) according to claim 2 or 3, wherein a side of the weak space (21) adjacent to the heat absorbing element (1) is open and communicates with the accommodating cavity.

5. The heat exchange device (100) according to any one of claims 2 to 4, wherein 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 portion except the weak space (21) is a, and the minimum distance between the side of the weak space (21) away from the heat absorbing element (1) and the outer periphery of the sealing element (2) is b, wherein: The b satisfies: 0.2a<b<0.8a.

6. The heat exchange device (100) according to any one of claims 2 to 5, wherein 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 portion except the weak space (21) is a, wherein: The a satisfies: 2mm≤a≤10mm.

7. The heat exchange device (100) according to any one of claims 2 to 6, wherein a projection of the weak space (21) on the first sealing layer (22) comprises a first side edge (211) and a second side edge (212), and a distance between the first side edge (211) and the second side edge (212) decreases from a side of the weak space (21) adjacent to the heat absorbing element (1) toward a side of the weak space (21) away from the heat absorbing element (1).

8. The heat exchange device (100) according to claim 7, wherein an end of the first side (211) away from the heat absorbing element (1) is connected to an end of the second side (212) away from the heat absorbing element (1).

9. The heat exchange device (100) according to claim 7 or 8, wherein the first side edge (211) has an inclination angle α relative to the corresponding edge of the sealing element (2), wherein: The α satisfies: 5°≤α≤60°; and / or The inclination angle of the second side (212) relative to the corresponding edge of the sealing member (2) is β, wherein β satisfies: 5°≤β≤60°.

10. The heat exchange device (100) according to any one of claims 2 to 9, wherein a projection shape of the weak space (21) on the first sealing layer (212) is a triangle.

11. The heat exchange device (100) according to any one of claims 2 to 9, wherein a projection shape of the weak space (21) on the first sealing layer (212) is an equilateral triangle.

12. The heat exchange device (100) according to any one of claims 1 to 11, wherein the heat absorbing element (1) is a phase change material element.

13. The heat exchange device (100) according to claim 12, wherein the phase change material is hydrogel or water.

14. A battery assembly comprising: A plurality of battery cells, wherein the plurality of battery cells are arranged in sequence; At least one heat exchange device (100), wherein the heat exchange device is the heat exchange device (100) according to any one of claims 1 to 13, and the heat exchange device (100) is arranged between two adjacent battery cells.

15. The battery assembly according to claim 14, wherein the weak space (21) of the heat exchange device (100) is close to a side of the battery cell where the explosion-proof valve is provided.

16. A battery pack comprising the heat exchange device (100) according to any one of claims 1 to 13, or the battery assembly according to claim 14 or 15.

17. An electric power system comprising the battery pack according to claim 16.

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