Heat absorbing component and battery
By filling the heat absorbing medium in the heat absorbing member of the heat absorbing assembly and designing a mechanism for rupturing and releasing the medium when under pressure, the problem of heat absorbing assembly rupture due to expansion and extrusion is solved, and higher extrusion resistance and reliability are achieved.
Patent Information
- Application Number
- CN202410822263.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-04-04
AI Technical Summary
Existing heat-absorbing components are prone to failure due to expansion and extrusion when the battery cell is thermally out of control, and cannot effectively absorb heat.
A heat absorbing assembly is designed, which includes a heat absorbing member filled in the package sleeve. The inner cavity of the heat absorbing member is filled with a heat absorbing medium. When the heat absorbing member is subjected to pressure exceeding a threshold, it will first burst and release the internal heat absorbing medium to fill the inner cavity of the package sleeve, thereby avoiding rupture due to excessive pressure.
Through the release and filling of the heat absorbing medium, the heat absorbing assembly can reduce its own size when extruded, avoid rupture failure, and improve extrusion resistance and reliability.
Smart Images
Figure CN119764646A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of heat absorption components, and in particular to a heat absorption component and a battery. Background Art
[0002] Thermal runaway of a battery cell releases a large amount of heat in a short period of time, which may damage other battery cells or other components.
[0003] By setting a heat-absorbing component near the battery cell, heat can be blocked and absorbed, but the heat-absorbing component may be ruptured and fail due to the expansion and compression of the battery cell during thermal runaway. Summary of the invention
[0004] In view of the above-mentioned technical problems, the purpose of the present application is to provide a heat absorption component that can avoid extrusion failure, and a battery including the above-mentioned heat absorption component, which specifically includes the following technical solutions:
[0005] In a first aspect, an embodiment of the present application provides a heat absorption component, which includes a packaging sleeve, wherein the packaging sleeve is filled with at least one heat absorption piece, and the inner cavity of the at least one heat absorption piece is filled with a heat absorption medium. The heat absorption piece is used to release the internal heat absorption medium when the pressure on the heat absorption component and / or the heat absorption piece exceeds a threshold value, and the heat absorption medium fills the inner cavity of the packaging sleeve.
[0006] The inner cavity of the heat absorbing component of the heat absorbing assembly of the present application is filled with a heat absorbing medium, which can absorb heat. When the heat absorbing component of the present application is squeezed, the heat absorbing component will rupture before the packaging sleeve, thereby releasing the heat absorbing medium inside the heat absorbing component, and the heat absorbing medium fills the inner cavity of the packaging sleeve, thereby preventing the heat absorbing component from rupturing due to excessive pressure.
[0007] It can be understood that after the heat absorbing component of the heat absorbing assembly of the present application is ruptured, the space volume of the heat absorbing component for accommodating the heat absorbing medium increases, thereby reducing the size of the heat absorbing component along the pressure direction, which can avoid the expansion and extrusion of the battery or other heating elements causing excessive pressure on the heat absorbing component, thereby preventing the heat absorbing component from rupture and failure due to extrusion.
[0008] In one embodiment, the pressure resistance of the packaging sleeve is greater than the pressure resistance of the heat absorption element.
[0009] In one embodiment, the packaging sleeve is filled with a plurality of heat absorbing members, and there are gaps between the plurality of heat absorbing members, respectively. The released heat absorbing medium is used to fill the gaps between the plurality of heat absorbing members.
[0010] In this embodiment, there are gaps between the multiple heat absorbing parts in the packaging sleeve. Part of the released heat absorbing medium fills the gaps between the multiple heat absorbing parts and can also reduce the size of the heat absorbing component along the pressure direction, thereby preventing the heat absorbing component from rupture and failure due to extrusion.
[0011] In one embodiment, the heat absorber further includes an outer shell, which includes at least two packaging layers, wherein one packaging layer is used to form an inner cavity of the heat absorber, and another packaging layer is used to cover the packaging layer forming the inner cavity, and there is a gap between two adjacent packaging layers, and the released heat absorption medium is also used to fill the gap between at least two packaging layers.
[0012] In this embodiment, there is a gap between at least two packaging layers of the shell of the heat absorption component. When the pressure on the packaging layer on the inner side exceeds a preset threshold, the heat absorption medium is released. The released heat absorption medium fills the gap between the at least two packaging layers, and can also reduce the size of the heat absorption component along the pressure direction, thereby preventing the heat absorption component from rupture and failure due to extrusion.
[0013] In one embodiment, the compressive strength of the at least two packaging layers tends to increase along a direction away from the inner cavity of the heat absorption component.
[0014] In this embodiment, the compressive strength of the relatively outer packaging layer of two adjacent packaging layers is greater than the compressive strength of the relatively inner packaging layer. When the heat absorber is squeezed, the pressure on the relatively inner packaging layer exceeds the preset threshold first and ruptures, so that the packaging layers of the heat absorber rupture from the inside to the outside in sequence as the pressure increases, and the heat absorbing medium also fills the gaps between the two adjacent packaging layers from the inside to the outside in sequence, and the size of the heat absorbing component along the pressure direction gradually decreases.
[0015] In one embodiment, the number of encapsulation layers is less than or equal to four.
[0016] In this embodiment, the number of packaging layers is small. More packaging layers will increase the manufacturing cost of the heat absorption component and make the total thickness of the outer shell of the heat absorption component larger, thereby reducing the volume of the heat absorption medium inside the heat absorption component, thereby reducing the heat insulation and heat absorption effects of the heat absorption component.
[0017] In one embodiment, each packaging layer is provided with a weak portion, and the compressive strength of the weak portion is less than the compressive strength of the packaging layer body.
[0018] In this embodiment, the compressive strength of the weak portion is lower than that of the packaging layer body. When the heat insulating layer is squeezed, the weak portion is more likely to rupture, so that the heat absorbing medium inside the relatively inner packaging layer is released through the weak portion to the gap between the two packaging layers, thereby reducing the size of the heat absorbing component along the pressure direction, thereby improving the reliability of the heat absorbing component.
[0019] In one embodiment, the thickness of the weak portion is smaller than the thickness of the packaging layer body.
[0020] In this embodiment, the thickness of the weak portion is smaller than the thickness of the packaging layer body. When the packaging layer is squeezed, the weak portion is more likely to rupture, and the heat absorption medium inside the relatively inner packaging layer can be released through the weak portion to the gap between the two packaging layers, so as to reduce the size of the heat absorption component along the pressure direction, thereby improving the reliability of the heat absorption component.
[0021] In one embodiment, each packaging layer is provided with a plurality of weak portions, the plurality of weak portions of each packaging layer are spaced apart from each other, and the plurality of weak portions of two adjacent packaging layers are staggered.
[0022] In this embodiment, each packaging layer is provided with a plurality of weak portions and the plurality of weak portions are spaced apart from each other, so that when the pressure applied to the weak portion exceeds a preset threshold, the internal heat absorbing medium can be uniformly released through the plurality of weak portions, thereby uniformly filling the gap between two adjacent packaging layers or the gap between the heat absorbing component and the packaging sleeve, so as to increase the spatial volume for accommodating the heat absorbing medium.
[0023] At the same time, the multiple weak parts of the two adjacent packaging layers are staggered, which can prevent the weak parts of the two adjacent packaging layers from being broken at the same time due to the impact of the heat absorbing medium. It can be understood that when the weak part of the relatively inner packaging layer is broken, the released heat absorbing medium has a large kinetic energy, and the heat absorbing medium will impact the relatively outer packaging layer, which may cause the weak part of the relatively outer packaging layer to break before the heat absorbing medium fills the gap between the two packaging layers, thereby causing the size of the heat absorbing component to reduce in the pressure direction to not reach the preset value, and the heat insulation and heat absorption capacity of the heat absorbing component that does not fill the gap between the two packaging layers is reduced.
[0024] In addition, it can also reduce the risk of reduced compressive strength of the weak parts of the outer packaging layer, which may cause the weak parts of the packaging layer to rupture prematurely at a pressure lower than the preset pressure, thereby reducing the heat absorption and insulation effect and service life of the heat absorption component.
[0025] In one embodiment, the ratio of the compressive strength of the weak portion to the compressive strength of the packaging layer body is in the range of 0.5-0.8.
[0026] In one embodiment, the ratio of the thickness of the weak portion to the thickness of the packaging layer body is in the range of 0.5-0.8.
[0027] In one embodiment, the ratio of the inner cavity volume of the relatively outer encapsulation layer to the inner cavity volume of the relatively inner encapsulation layer of two adjacent encapsulation layers is in the range of 1.05-1.50.
[0028] In this embodiment, by limiting the ratio of the inner cavity volume between the two packaging layers, it is possible to ensure that the size of the heat absorption component is gradually reduced and has better heat insulation and heat absorption effects.
[0029] It can be understood that when the ratio of the inner cavity volume between the two packaging layers is small, the heat absorption medium released by the relatively inner packaging layer may cause the relatively outer packaging layer to rupture, thereby causing the disposable multi-layer packaging layer to rupture, and the size of the heat absorption component along the pressure direction to decrease rapidly; when the ratio of the inner cavity volume between the two packaging layers is large, the gap between the two packaging layers is too large, resulting in uneven distribution of the heat absorption medium used to fill the gap, thereby reducing the heat insulation and heat absorption effects of the heat absorption component.
[0030] In one embodiment, the gap between two adjacent packaging layers is a vacuum.
[0031] In one embodiment, the shell includes multiple layers of the packaging layers, the multiple packaging layers include a first packaging layer and multiple layers of second packaging layers, the first packaging layer forms an inner cavity of the heat absorption component, the heat absorption medium is filled in the inner cavity of the heat absorption component, the multiple layers of the second packaging layers are sequentially wrapped with each other, and the innermost second packaging layer wraps the outside of the first packaging layer; wherein, there is a gap between the first packaging layer and the second packaging layer and / or two adjacent layers of the second packaging layer, and the released heat absorption medium is also used to fill the gap.
[0032] In one embodiment, there is a gap between the at least one heat absorbing member and the packaging sleeve, and the released heat absorbing medium is used to fill the gap between the at least one heat absorbing member and the packaging sleeve.
[0033] In one embodiment, the gap between the packaging sleeve and the at least one heat absorbing element is a vacuum.
[0034] In one embodiment, the heat absorption component includes a bracket, and the bracket is used to limit the minimum deformation of the packaging sleeve along the pressure direction, wherein: the bracket is located in the inner cavity of the heat absorption component and / or the bracket is located between the packaging sleeve and the heat absorption component.
[0035] In this embodiment, by arranging a bracket in the inner cavity of the heat absorbing component and / or in the gap between the packaging sleeve and the heat absorbing component, the deformation of the packaging sleeve can be limited, ensuring that the pressure on the packaging sleeve during the compression of the heat absorbing component does not exceed a preset threshold, thereby preventing the packaging sleeve from rupturing and causing the heat insulating medium to contaminate other components. At the same time, the bracket can improve the pressure-bearing strength of the heat absorbing component.
[0036] In a second aspect, the present application also provides a battery, comprising a battery cell and the above-mentioned heat absorption component, wherein the heat absorption component is used for heat insulation and heat absorption of the battery cell.
[0037] It can be understood that the battery of the present application has a more stable heat insulation and heat absorption effect and higher reliability because it adopts the above-mentioned heat absorption component. BRIEF DESCRIPTION OF THE DRAWINGS
[0038] Figure 1A schematic cross-sectional structure diagram of a heat absorption component provided in one embodiment of the present application;
[0039] Figure 2 A schematic cross-sectional structure diagram of a heat absorbing element provided in one embodiment of the present application;
[0040] Figure 3 A schematic diagram of the structure of a battery provided in one embodiment of the present application;
[0041] Figure 4 A schematic diagram of the cross-sectional structure of a portion of a heat absorption component before the packaging layer is broken provided in one embodiment of the present application;
[0042] Figure 5 A schematic diagram of the cross-sectional structure of a portion of a heat absorption component after the packaging layer is broken provided in one embodiment of the present application;
[0043] Figure 6 A schematic cross-sectional structure diagram of a heat absorption component provided in another embodiment of the present application;
[0044] Figure 7 A schematic cross-sectional structure diagram of a heat absorption component provided in another embodiment of the present application;
[0045] Figure 8 A schematic cross-sectional structure diagram of a heat absorption component provided in another embodiment of the present application;
[0046] Fig. 9 This is a schematic diagram of the structure of a battery provided in another embodiment of the present application. DETAILED DESCRIPTION
[0047] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.
[0048] The following descriptions of the embodiments are with reference to the attached diagrams to illustrate specific embodiments that the present application can be used to implement. The serial numbers for the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present application, unless otherwise specified, include direct and indirect connections (couplings). The directional terms mentioned in the present application, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.
[0049] See also Figure 1 and Figure 2 ,in, Figure 1 A schematic cross-sectional structure diagram of a heat absorption assembly 100 provided in one embodiment of the present application is illustrated; Figure 2 The cross-sectional structure diagram of the heat absorbing element 20 provided in one embodiment of the present application is illustrated.
[0050] The heat absorption component 100 of the present application includes a packaging sleeve 10 , in which at least one heat absorption component 20 is filled, and an inner cavity of the at least one heat absorption component 20 is filled with a heat absorption medium 30 .
[0051] Specifically, in one embodiment, Figure 1 and Figure 2 As shown, a heat absorbing member 20 is filled in the packaging sleeve 10, and a heat absorbing medium 30 is filled in the accommodating cavity 21 of the heat absorbing member 20, and the heat absorbing medium 30 fills the accommodating cavity 21. The outer shell of the heat absorbing member 20 includes two packaging layers 22, namely a first packaging layer 222 and a second packaging layer 221. The inner cavity of the first packaging layer 222 is used to form the accommodating cavity 21 to accommodate the heat absorbing medium 30, and the inner cavity of the second packaging layer 221 is used to accommodate the first packaging layer 222. There is a gap between the packaging sleeve 10 and the second packaging layer 221, namely the first gap 11.
[0052] The heat absorbing member 20 of the heat absorbing assembly 100 of the present application is used to release the internal heat absorbing medium 30 when the pressure applied to the heat absorbing assembly 100 exceeds a preset threshold, so that the heat absorbing medium 30 fills the inner cavity of the packaging sleeve 10 .
[0053] Specifically, in one embodiment, Figure 1 and Figure 2As shown, when the heat absorption component 100 is subjected to pressure due to external extrusion, the packaging sleeve 10 and the heat absorption member 20 are both subjected to pressure and deformed, and the preset threshold of the pressure of the packaging sleeve 10 is higher than the preset threshold of the pressure of the heat absorption member 20. As the pressure on the heat absorption component 100 increases, the heat absorption member 20 ruptures first, and then releases the heat absorption medium 30 in the accommodating cavity 21. After the second packaging layer 221 and the first packaging layer 222 of the heat absorption member 20 are both ruptured, the heat absorption medium 30 will fill the first gap 11 between the heat absorption member 20 and the packaging sleeve 10.
[0054] See also Figure 3 A schematic diagram of the structure of a battery 200 provided in one embodiment of the present application is shown.
[0055] It is necessary to point out that please combine Figure 3 The battery 200 provided, Figure 1 and Figure 2 001 is a cross-sectional view of the heat absorption component 100. The volume of the heat absorption medium 30 remains unchanged. Part of the heat absorption medium 30 is used to fill the first gap 11, so that the cross-sectional area of the heat absorption medium 30 perpendicular to the first direction 001 increases, thereby increasing the volume of the space accommodating the heat absorption medium 30. Under the pressure of the battery cell 110, the size of the heat absorption medium 30 along the first direction 001 decreases. The size of the heat absorption medium 30 along the first direction 001 decreases, so that the size of the heat absorption component 100 along the first direction 001 also decreases.
[0056] The accommodating cavity 21 of the heat absorbing member 20 of the heat absorbing assembly 100 of the present application is filled with a heat absorbing medium 30. The heat absorbing medium 30 has a high specific heat capacity and a high latent heat of phase change. After absorbing heat, it heats up slowly or undergoes a phase change, thereby ensuring that the heat absorbing assembly 100 has a good thermal insulation effect on both sides.
[0057] In the existing heat absorption component, a heat absorption medium is filled in the shell to absorb heat. The heat absorption component is arranged near the heating element to absorb heat from the heating element and reduce the heat generated by the heating element from being transferred to other adjacent heating elements. During the operation of the heating element, its shell will expand due to the high temperature, and the expanded shell of the heating element is likely to squeeze the adjacent heat absorption component. When the heating power of the heating element is high or thermal runaway occurs, a large amount of heat will cause the temperature to rise rapidly, and the expansion and squeezing of the shell will also be more serious. If the pressure on the heat absorption component is greater than the maximum bearing threshold of the shell, the shell of the heat absorption component will rupture, and the heat absorption medium will be squeezed out of the shell. The heat absorption component cannot achieve the functions of heat insulation and heat absorption, and the squeezed heat absorption medium will contaminate the heating element or other components.
[0058] The packaging sleeve 10 of the heat absorption component 100 of the present application is provided with a heat absorption element 20 for accommodating a heat absorption medium 30. When the pressure of the heat absorbing element or the outside world squeezing the heat absorption component 100 and / or the pressure inside the heat absorption element exceeds a preset threshold, the heat absorption element 20 will first rupture and release the heat absorption medium 30 inside. The heat absorption medium 30 fills the inner cavity of the packaging sleeve 10, so that the volume of the space accommodating the heat absorption medium 30 increases. Under the action of the pressure, the size of the heat absorption component 100 along the first direction 001 is reduced, thereby reducing the pressure of the heat absorbing element or the outside world on the heat absorption component 100.
[0059] Compared with the existing heat absorbing components, the heat absorbing component 100 of the present application can release the heat absorbing medium 30 inside the heat absorbing element 20 to increase the volume of the space accommodating the heat absorbing medium when it is squeezed by the outside world, thereby reducing the pressure on the heat absorbing component 100 and avoiding the heat absorbing component 100 from being broken or failed due to factors such as the expansion and squeezing of the outer shell of the heating element. It can also release the heat absorbing medium 30 inside the heat absorbing element 20 to increase the volume of the space accommodating the heat absorbing medium when the pressure inside the heat absorbing element increases, thereby reducing the pressure on the heat absorbing component 100 and causing the heat absorbing component 100 to be broken or failed.
[0060] It is understandable that the heat absorption component 100 of the present application can reduce its own size along the pressure direction due to the rupture inside the heat absorption component 100, and has better adaptability. Compared with the existing heat absorption components, the heat absorption component 100 of the present application has stronger anti-extrusion ability and higher reliability, and will not cause the packaging sleeve to rupture and the heat absorption medium to be squeezed out due to excessive pressure, so it can be applied to a variety of complex heat insulation and heat absorption scenarios.
[0061] In one embodiment of the present application, the heating element mentioned above may be a battery cell.
[0062] The present application also provides a battery 200, the battery 200 includes a battery cell 110 and the above-mentioned heat absorption component 100, and the heat absorption component 100 is used to absorb heat from the battery cell 110. Specifically, in one embodiment, Figure 3 As shown, the heat absorption component 100 is disposed adjacent to the battery core 110 , and the battery core 110 and the heat absorption component 100 are spaced apart from each other.
[0063] In other embodiments, the battery cell 110 may also be attached to the heat absorption component 100 , and the positional relationship between the battery cell 110 and the heat absorption component 100 may be set based on the size of the space in the battery 200 that accommodates the battery cell 110 and the heat absorption component 100 .
[0064] It is understandable that when thermal runaway occurs in the battery cell 110, the battery cell 110 will release more heat in a short period of time, which is more likely to cause the battery cell 110 to expand and squeeze the heat absorption component 100. The heat absorption component 100 of the present application can also be applied to this scenario, which can ensure the heat insulation and heat absorption effects of the battery cell 110 and avoid the battery cell 110 being squeezed and causing the heat absorption component 100 to rupture and fail.
[0065] It should be pointed out that the heat absorption component 100 of the present application can not only be used in the battery 200 for heat insulation and heat absorption of the battery cell 110, but also in other devices or systems that require heat insulation and heat absorption. The heat absorption component 100 of the present application is also used, and has stronger anti-extrusion ability and higher reliability.
[0066] In one embodiment, the pressure resistance of the packaging sleeve 10 is greater than that of the heat absorbing member 20, so that the heat absorbing member 20 will rupture before the packaging sleeve 10, so as to ensure that the heat absorbing medium 30 can flow into the inner cavity of the packaging sleeve 10; at the same time, the volume of the space accommodating the heat absorbing medium 30 increases, so that the size of the packaging sleeve 10 along the pressure direction is reduced under the action of pressure, thereby reducing the pressure on the packaging sleeve 10 to avoid rupture of the packaging sleeve 10. Specifically, the pressure resistance of the packaging sleeve 10 is greater than the pressure resistance of the heat absorbing member 20 means that the pressure resistance of the packaging sleeve 10 is greater than the pressure resistance of the outer shell of the heat absorbing member 20.
[0067] In one embodiment, the packaging sleeve 10 is filled with a plurality of heat absorbing members 20, each of which has a gap therebetween, and the released heat absorbing medium 30 is used to fill the gaps between the plurality of heat absorbing members 20. Filling the gaps between the plurality of heat absorbing members 20 with the heat absorbing medium 30 can also reduce the size of the heat absorbing assembly 100 in the pressure direction under the action of pressure.
[0068] In one embodiment, along the direction perpendicular to the first direction 001, there are gaps between the multiple heat absorbing members 20 filled in the packaging sleeve 10, and after some of the heat absorbing members 20 release the internal heat absorbing medium 30, the heat absorbing medium 30 can also fill the gaps between the multiple heat absorbing members 20. The total volume of the heat absorbing medium 30 inside the multiple heat absorbing members 20 remains unchanged, and after the heat absorbing medium 30 fills the gaps under the action of pressure, the cross-sectional area of the heat absorbing medium 30 along the first direction 001 increases, so that the size of the heat absorbing medium 30 along the first direction 001 is reduced, and further, the size of the heat absorbing assembly 100 along the first direction 001 is reduced under the action of pressure.
[0069] In one embodiment, if Figure 1 As shown, a gap, namely a first gap 11, is left between the packaging sleeve 10 and the heat absorption component 20. The released filling heat absorption medium 30 can fill the first gap 11, so that the volume of the heat absorption medium 30 increases, thereby achieving a size reduction of the heat absorption component 100 along the pressure direction under the action of pressure.
[0070] In one embodiment, if Figure 3 As shown, after the battery core 110 heats up and expands, it contacts the heat absorption component 100. The heat absorption component 100 is subjected to the pressure of the battery core 110 along the first direction 001. A gap is left between the packaging sleeve 10 and the heat absorption component 20 along the direction perpendicular to the first direction 001. The inner surface of the packaging sleeve 10 and the outer surface of the heat absorption component 20 fit each other along the first direction. The released heat absorption medium 30 will fill the gap along the direction perpendicular to the first direction 001, increase the volume of the space accommodating the heat absorption medium 30, and reduce the size of the heat absorption component 100 along the first direction 001 under the action of the pressure of the battery core 110.
[0071] In one embodiment, the heat absorbing member 20 further comprises an outer shell, and the outer shell comprises at least two packaging layers 22, wherein one packaging layer is used to form an inner cavity of the heat absorbing member 20, and the other packaging layer is used to cover the outer surface of the packaging layer forming the inner cavity, and there is a gap between two adjacent packaging layers 22, and the released heat absorbing medium 30 is also used to fill the gap between the at least two packaging layers 22. There is a gap between the at least two packaging layers 22 of the outer shell of the heat absorbing member 20, and the heat absorbing medium 30 is released when the pressure on the packaging layer 22 on the inner side (i.e., the packaging layer 22 adjacent to the inner cavity of the heat absorbing member 20) exceeds a preset threshold, and the released heat absorbing medium 30 fills the gap between the at least two packaging layers 22, and can also reduce the size of the heat absorbing component 100 along the pressure direction under the action of pressure, thereby preventing the heat absorbing component 100 from rupture and failure due to extrusion.
[0072] In one embodiment, if Figure 2 As shown, the outer shell of the heat absorbing member 20 includes two packaging layers 22, namely a first packaging layer 222 and a second packaging layer 221. The first packaging layer 222 is used to form a receiving cavity 21 of the heat absorbing member 20. The first packaging layer 222 is located in the inner cavity formed by the second packaging layer 221. The receiving cavity 21 is used to fill the heat absorbing medium 30. There is a gap between the second packaging layer 221 and the first packaging layer 222, that is, the second gap 223. When the pressure on the first packaging layer 222 exceeds a preset threshold, the first packaging layer 222 ruptures and releases the heat absorbing medium 30 in the receiving cavity 21. The released heat absorbing medium 30 fills the second gap 223, so that the size of the heat absorbing component 100 along the pressure direction is reduced under the action of pressure.
[0073] In one embodiment, both the packaging layer 22 and the packaging sleeve 10 include aluminum-plastic films. In other embodiments, the packaging layer 22 and the packaging sleeve 10 are made of other materials with good heat insulation and heat absorption effects or materials with good tensile strength.
[0074] In one embodiment, the compressive strength of at least two packaging layers increases in the direction away from the inner cavity of the heat absorbing member, so that the space volume of the heat absorbing member used to accommodate the heat absorbing medium can be expanded according to different pressures, thereby ensuring the reliability of the heat absorbing component and reducing the risk of the heat absorbing component directly rupturing and failing due to expansion and extrusion when the battery cell is under thermal runaway. Furthermore, the compressive strength of at least two packaging layers 22 increases from the inside to the outside, which can gradually increase the space volume of the heat absorbing member used to accommodate the heat absorbing medium, so as to gradually improve the reliability of the heat absorbing component.
[0075] In one embodiment, if Figure 2 As shown, the compressive strength of the first encapsulation layer 222 is less than that of the second encapsulation layer 221, and the first encapsulation layer 222 is broken first, and the heat absorbing medium 30 fills the second gap 223, so that the space of the heat absorbing component 100 for accommodating the heat absorbing medium is increased. Afterwards, the second encapsulation layer 221 is broken, and the heat absorbing medium 30 fills the first gap 11, so that the space of the heat absorbing component 100 for accommodating the heat absorbing medium is increased again, thereby reducing the risk of the heat absorbing component 100 being directly broken and failed due to expansion and extrusion during thermal runaway of the battery cell.
[0076] In other embodiments, the heat absorption component 20 has three or more packaging layers 22, and the compressive strength of the packaging layers 22 increases from the inside to the outside. As the pressure on the heat absorption component 100 gradually increases, the packaging layers 22 will rupture from the inside to the outside, and the heat absorption medium 30 will fill the gap between two adjacent packaging layers 22 from the inside to the outside, so that the size of the heat absorption component 100 is gradually reduced.
[0077] Specifically, in one embodiment of the present application, the multi-layer packaging layer 22 includes a first packaging layer 222 and a multi-layer second packaging layer 221, the first packaging layer 222 forms an inner cavity of the heat absorbing element 20, the heat absorbing medium 30 is filled in the inner cavity of the heat absorbing element 20, the multi-layer second packaging layers 221 are mutually covered in sequence, and the innermost second packaging layer 221 covers the outside of the first packaging layer 222; wherein, there is a gap between the first packaging layer 222 and the second packaging layer 221 and / or two adjacent layers of the second packaging layer 221, and the released heat absorbing medium 30 is also used to fill the gap. In the above embodiment, the design of the multi-layer packaging layer 22 can further increase the space for accommodating the heat absorbing element 20 and / or the heat absorbing component 100 after being subjected to pressure, so as to reduce the damage of the heat absorbing component 100 and improve the overall pressure resistance.
[0078] In one embodiment, the number of the encapsulation layer 22 is less than or equal to four layers.
[0079] In one embodiment, the heat absorption element 20 has four or fewer packaging layers 22. More packaging layers 22 will increase the manufacturing cost of the heat absorption component 100, and will also make the total thickness of the outer shell of the heat absorption element 20 larger, thereby reducing the volume of the heat absorption medium 30 inside the heat absorption element 20, thereby reducing the heat insulation and heat absorption effects of the heat absorption component 100.
[0080] In one embodiment, each packaging layer 22 is provided with a weak portion 23, and the compressive strength of the weak portion 23 is less than the compressive strength of the packaging layer 22 body; and / or the thickness of the weak portion 23 is less than the thickness of the packaging layer 22 body. The thickness and / or compressive strength of the weak portion 23 are set to be less than the thickness and / or compressive strength of the packaging layer 22 body, so that when the packaging layer 22 is squeezed, the weak portion 23 is more likely to rupture, and the heat absorption medium 30 inside the packaging layer 22 on the inner side is released to the gap between the two packaging layers 22 through the weak portion 23, so that the size of the heat absorption component 100 along the pressure direction is reduced under the action of pressure.
[0081] In another embodiment, the compressive strength and / or thickness of the connection between the weak portion 23 and the packaging layer 22 body are both smaller than the compressive strength and / or thickness of the weak portion 23 and the compressive strength and / or thickness of the packaging layer 22 body. When the heat absorption component 100 is squeezed, the pressure of the heat absorption medium 30 causes the connection between the weak portion 23 and the packaging layer 22 to fail, and the heat absorption medium 30 can also be released through the weak portion 23.
[0082] In one embodiment, the ratio of the compressive strength of the weak portion 23 to the compressive strength of the packaging layer 22 is in the range of 0.5-0.8.
[0083] In another embodiment, the ratio of the thickness of the weak portion 23 to the thickness of the packaging layer 22 is in the range of 0.5-0.8.
[0084] In the above two embodiments, by setting the ratio range of the compressive strength and the thickness of the weak portion 23 to the packaging layer 22 , the weak portion 23 can withstand a certain pressure and can rupture before the main body of the packaging layer 22 to release the heat absorption medium 30 .
[0085] See also Figure 4 and Figure 5 ,in, Figure 4 A schematic cross-sectional structure diagram of a portion of the heat absorption component 100 before the packaging layer 22 is broken provided in an embodiment of the present application is illustrated; Figure 5 The cross-sectional structure diagram of a portion of the heat absorption component 100 after the packaging layer 22 provided in an embodiment of the present application is broken is illustrated.
[0086] In one embodiment, if Figure 2 and Figure 4As shown, the first packaging layer 222 is provided with a first weak portion 232, the second packaging layer 221 is provided with a second weak portion 231, and the inner cavity of the first packaging layer 222 is filled with a heat absorbing medium 30. When the heat absorbing component 100 is squeezed, as shown in FIG. Figure 5 As shown, the pressure on the first weak portion 232 exceeds the preset threshold first, the first weak portion 232 ruptures, and the heat absorption medium 30 is released into the second gap 223 through the first weak portion 232 and fills the second gap 223, so that the size of the heat absorption component 100 along the pressure direction is reduced under the action of pressure, and the spatial volume of the heat absorption component for accommodating the heat absorption medium is increased.
[0087] In one embodiment, the compressive strength of the weak portion 23 of the at least two packaging layers 22 increases in a direction away from the inner cavity of the heat absorber. Further, the compressive strength of the weak portion 23 of the at least two packaging layers 22 increases from the inside to the outside.
[0088] In one embodiment, if Figure 4 and Figure 5 As shown, the compressive strength of the second encapsulation layer 221 and the first encapsulation layer 222 are both greater than the compressive strength of the weak portion 23, and the compressive strength of the first weak portion 232 is less than the compressive strength of the second weak portion 231. When the heat absorption component 100 is squeezed, the first weak portion 232 is first broken, and the heat absorption medium 30 fills the second gap 223, so that the size of the heat absorption component 100 along the pressure direction is reduced under the action of pressure. Afterwards, the second weak portion 231 is broken, and the heat absorption medium 30 fills the first gap 11, so that the size of the heat absorption component 100 along the pressure direction is reduced again under the action of pressure, and the size of the heat absorption component 100 along the pressure direction can also be gradually reduced.
[0089] See also Figure 6-Figure 8 ,in, Figure 6 A cross-sectional structural diagram of a heat absorption component 100 provided in another embodiment of the present application is illustrated; Figure 7 A cross-sectional structural diagram of a heat absorption component 100 provided in another embodiment of the present application is illustrated; Figure 8 A cross-sectional structural diagram of a heat absorption component 100 provided in another embodiment of the present application is illustrated.
[0090] In one embodiment, each packaging layer 22 is provided with a weak portion 23 , and the packaging layer 22 releases the internal heat absorbing medium 30 through the weak portion 23 .
[0091] In one embodiment, if Figure 6 and Figure 7As shown, along the first direction 001, the cross-sections of the second encapsulation layer 221 and the first encapsulation layer 222 are both hollow rectangles, the second weak portion 231 and the first weak portion 232 form one side of the hollow rectangle, the second weak portion 231 and the first weak portion 232 occupy a large area, and the amount of heat absorption medium 30 passing through the weak portion 23 is large, which can achieve rapid release of the internal heat absorption medium 30.
[0092] It can be understood that in other embodiments, the cross-sections of the second encapsulation layer 221 and the first encapsulation layer 222 can be other shapes, and the specific shapes of the second encapsulation layer 221 and the first encapsulation layer 222 can be set based on the set position and space size.
[0093] In one embodiment, each packaging layer 22 is provided with a plurality of weak portions 23 , and the plurality of weak portions 23 are spaced apart from each other. The packaging layer 22 releases the internal heat absorbing medium 30 through the plurality of weak portions 23 .
[0094] In one embodiment, if Figure 1 and Figure 8 As shown, multiple second weak portions 231 are evenly distributed on the second packaging layer 221, and multiple first weak portions 232 are evenly distributed on the first packaging layer 222. The multiple weak portions 23 evenly distributed on the packaging layer 22 allow the internal heat absorption medium 30 to evenly fill the second gap 223 through the multiple weak portions 23, thereby ensuring the filling effect of the second gap 223.
[0095] In one embodiment, the weak parts 23 of two adjacent packaging layers 22 are arranged in a staggered manner. It can be understood that when the weak part 23 of the relatively inner packaging layer 22 ruptures to release the internal heat absorbing medium 30, the heat absorbing medium 30 has a large kinetic energy, and the heat absorbing medium 30 directly impacts the relatively outer packaging layer 22.
[0096] When the weak portion 23 of the relatively outer packaging layer 22 is located at the impact position, the heat absorbing medium 30 may cause the weak portion 23 of the relatively outer packaging layer 22 to rupture, that is, the heat absorbing medium 30 has not yet filled the gap between the two packaging layers 22, and the weak portion 23 of the relatively outer packaging layer 22 has been ruptured, thereby causing the size of the heat absorbing component 100 reduced in the pressure direction to not reach the preset value, and the heat insulation and heat absorption capacity of the heat absorbing component 100 that has not filled the gap between the two packaging layers 22 is reduced. Therefore, by staggering the weak portions 23 of the adjacent two packaging layers 22, it is possible to avoid the weak portions 23 of multiple packaging layers 22 from rupturing at the same time. In addition, by staggering the weak portions 23 of the adjacent two packaging layers 22, it is also possible to reduce the risk of reduced pressure resistance of the outer packaging weak portion 23, thereby causing the weak portion 23 of the packaging layer to rupture prematurely at a pressure less than the preset pressure, thereby reducing the heat absorption and insulation effect and service life of the heat absorbing component 100. Furthermore, the packaging weak portions 23 of two adjacent packaging layers 22 are arranged in a staggered manner, so that the released heat absorption medium 30 can be evenly distributed in the gaps between the adjacent packaging layers 22 .
[0097] In one embodiment, if Figure 6 As shown, the second weak portion 231 of the second encapsulation layer 221 and the first weak portion 232 of the first encapsulation layer 222 are respectively located on two adjacent sides of the hollow rectangle. When the first weak portion 232 ruptures, the released heat absorption medium 30 will not directly impact the second weak portion 231, thereby preventing the weak portions 23 of the multiple encapsulation layers 22 from rupturing at the same time.
[0098] In one embodiment, if Figure 7 As shown, the second weak portion 231 of the second packaging layer 221 and the first weak portion 232 of the first packaging layer 222 are respectively located on two opposite sides of the hollow rectangle. When the first weak portion 232 is broken, the released heat absorption medium 30 will not directly impact the second weak portion 231, and the weak portions 23 of the multi-layer packaging layer 22 can also be prevented from breaking simultaneously.
[0099] In one embodiment, each packaging layer 22 is provided with a plurality of weak portions 23 , the plurality of weak portions 23 of each packaging layer 22 are spaced apart from each other, and the plurality of weak portions of two adjacent packaging layers 22 are staggered.
[0100] In one embodiment, if Figure 1 As shown, the multiple second weak portions 231 of the second packaging layer 221 are spaced apart from each other, the multiple first weak portions 232 of the first packaging layer 222 are spaced apart from each other, and the multiple second weak portions 231 and the multiple first weak portions 232 are staggered, which can evenly fill the second gap 223, ensure the filling effect of the second gap 223, and avoid the second weak portions 231 and the first weak portions 232 from rupturing at the same time.
[0101] In one embodiment, if Figure 8As shown, the second encapsulation layer 221 and the first encapsulation layer 222 are respectively provided with a plurality of second weak portions 231 and a plurality of first weak portions 232, and the positions of at least some of the second weak portions 231 correspond to the positions of the first weak portions 232, so that after the second weak portions 231 are broken, the released heat absorption medium 30 will directly impact the first weak portions 232. In order to avoid the first weak portions 232 being broken due to the impact of the heat absorption medium 30, the compressive strength and / or thickness of the first weak portions 232 should be greater than the compressive strength and / or thickness of the second weak portions 231, and ensure that the first weak portions 232 can withstand the impact of the heat absorption medium 30.
[0102] In one embodiment, the ratio of the inner cavity volume of the relatively outer encapsulation layer 22 to the inner cavity volume of the relatively inner encapsulation layer 22 of two adjacent encapsulation layers 22 is in the range of 1.05-1.50.
[0103] It can be understood that when the ratio of the inner cavity volume between the two packaging layers 22 is small, the heat absorption medium 30 released by the relatively inner packaging layer 22 may cause the relatively outer packaging layer 22 to rupture, thereby causing the disposable multi-layer packaging layer 22 to rupture and the size of the heat absorption component 100 to decrease rapidly; when the ratio of the inner cavity volume between the two packaging layers 22 is large, the gap between the two packaging layers 22 is too large, resulting in uneven distribution of the heat absorption medium 30 used to fill the gap, thereby reducing the heat insulation and heat absorption effects of the heat absorption component 100.
[0104] In one embodiment, if Figure 1 As shown, the ratio of the inner cavity volume of the second packaging layer 221 to the inner cavity volume of the first packaging layer 222 is in the range of 1.05-1.50, thereby avoiding the rapid reduction in the size of the heat absorption component 100 along the pressure direction and the reduction in the heat insulation and heat absorption effects of the heat absorption component 100.
[0105] In another embodiment, the outer shell of the heat absorption component 20 includes three or more packaging layers 22. By setting the ratio of the inner cavity volumes of two adjacent packaging layers to be in the range of 1.05-1.50, it is also possible to avoid a rapid reduction in the size of the heat absorption component 100 along the pressure direction and a reduction in the heat insulation and heat absorption effects of the heat absorption component 100.
[0106] In one embodiment, the gap between the packaging sleeve 10 and the heat absorbing member 20 is a vacuum. When the pressure on the heat absorbing member 20 exceeds a preset threshold, the released heat absorbing medium 30 can evenly fill the gap between the packaging sleeve 10 and the heat absorbing member 20, ensuring that the size of the heat absorbing assembly 100 along the pressure direction is reduced and has a good heat insulation and heat absorption effect.
[0107] In one embodiment, the gap between two adjacent packaging layers 22 is a vacuum. When the pressure on the relatively inner packaging layer 22 exceeds a preset threshold, the released heat absorbing medium 30 can evenly fill the gap between the two adjacent packaging layers 22, ensuring that the size of the heat absorbing component 100 along the pressure direction is reduced and has a good heat insulation and heat absorption effect.
[0108] In one embodiment, the gap between the packaging sleeve 10 and the heat absorbing member 20 and the gap between two adjacent packaging layers 22 are both vacuum, so that the released heat absorbing medium 30 can evenly fill the gap between the packaging sleeve 10 and the heat absorbing member 20 and the gap between two adjacent packaging layers 22, thereby ensuring that the size of the heat absorbing component 100 along the pressure direction is reduced and has better heat insulation and heat absorption effects.
[0109] In one embodiment, the heat absorption component 100 includes a bracket 40, which is located in the inner cavity of the heat absorption component 20 and / or in the gap between the packaging sleeve 10 and the heat absorption component 20, and is used to limit the deformation of the packaging sleeve 10 in the pressure direction. It is ensured that the pressure on the packaging sleeve 10 during the compression of the heat absorption component 100 does not exceed a preset threshold, thereby preventing the packaging sleeve 10 from rupturing and causing the heat absorption medium 30 to contaminate other components.
[0110] In one embodiment, if Figure 1 As shown, a heat absorbing medium 30 and a bracket 40 are provided in the accommodating cavity 21 of the heat absorbing element 20, and the size of the bracket 40 is smaller than the size of the heat absorbing element 20 when the internal heat absorbing medium 30 is released, that is, the bracket 40 will not affect the rupture of the second packaging layer 221 and the first packaging layer 222 and the release of the heat absorbing medium 30.
[0111] It is understandable that after the second packaging layer 221 and the first packaging layer 222 release the heat absorbing medium 30, the size of the heat absorbing component 100 will not change, and the external pressure on the heat absorbing component 100 may continue to increase, which may easily cause the packaging sleeve 10 to deform too much, resulting in the packaging sleeve 10 rupture and the release of the heat absorbing medium 30 inside. The size of the bracket 40 is larger than the minimum size of the packaging sleeve 10 after deformation, and is used to limit the minimum deformation of the packaging sleeve 10 to prevent the packaging sleeve 10 from rupturing.
[0112] In some embodiments, the material of the bracket 40 includes one or more of polyethylene, polypropylene, and glass fiber.
[0113] In one embodiment, if Figure 1 As shown, the bracket 40 is provided with a hollow portion, and the hollow portion can accommodate part of the heat absorbing medium 30 to increase the accommodation capacity of the heat absorbing medium 30 in the accommodation cavity 21.
[0114] In some embodiments, the shape of the hollow portion of the bracket 40 can be a combination of one or more of a triangle, a circle, a diamond, and a rectangle.
[0115] In one embodiment, if Figure 3 As shown, the arrangement direction of the heat absorption component 100 and the battery cell 110 is parallel to the first direction 001. When the battery cell 110 heats up and expands and squeezes the heat absorption component 100, the heat absorption member 20 releases the internal heat absorption medium 30, and the size of the heat absorption component 100 along the first direction 001 is reduced, so that the pressure on the heat absorption component 100 is reduced.
[0116] After the heat absorbing medium 30 fills the gap between the packaging sleeve 10 and the heat absorbing element 20, the size of the heat absorbing component 100 along the first direction 001 remains unchanged. The battery cell 110 continues to heat up and expand, squeezing the heat absorbing component 100, which may cause the packaging sleeve 10 to rupture. The bracket 40 can abut against the expanded battery cell 110 to limit the deformation of the packaging sleeve 10 caused by squeezing, thereby avoiding the packaging sleeve 10 from rupturing.
[0117] See also Fig. 9 A schematic diagram of the structure of a battery 200 provided in another embodiment of the present application is shown.
[0118] In one embodiment, if Fig. 9 As shown, the heat absorption component 100 is located between two battery cells 110, and the arrangement direction of the two battery cells 110 is parallel to the first direction 001. The two battery cells 110 generate heat and expand while squeezing the heat absorption component 100. The bracket 40 can not only abut against the two expanded battery cells 110 to limit the deformation of the packaging sleeve 10 caused by squeezing, thereby avoiding the packaging sleeve 10 from breaking, but also limit the minimum distance between the two battery cells 110, thereby slowing down the transfer of heat.
[0119] In one embodiment, along a direction perpendicular to the first direction 001 , the size of the heat absorption component 100 is larger than the size of the battery cell 110 , so that the heat absorption component 100 can completely separate the two battery cells 110 , thereby ensuring the heat insulation and heat absorption effect between the two battery cells 110 .
[0120] Understandably, for Figure 3 and Fig. 9 In the battery 200 shown, the heat absorption component 100 can be arranged on one side of the battery cell 110, or can be arranged around the battery cell 110 to separate the battery cell 110 from the outside, thereby ensuring the heat insulation of the battery cell 110.
[0121] In some embodiments, the heat absorbing medium 30 may be a material with good heat insulation and heat absorption effects, and the state of the heat absorbing medium 30 includes but is not limited to solid powder, solid small particles, liquid and gas.
[0122] In one embodiment, the state of the heat absorbing medium 30 includes solid powder, solid small particles and liquid. Part of the heat absorbing medium 30 undergoes phase change after absorbing heat, which can improve the heat insulation and heat absorption effects of the heat absorption component 100. At the same time, the heat absorbing medium 30 after the phase change also has a good heat insulation effect, which can further improve the heat insulation and heat absorption effects of the heat absorption component 100.
[0123] In some embodiments, the heat absorbing medium 30 includes gel, which can absorb liquid or gas, so that the heat absorbing medium 30 has a better heat insulation effect.
[0124] In one embodiment, the heat absorbing medium 30 includes a hydrogel, the size of the hydrogel is larger than the size of the bracket 40, and water is absorbed inside the hydrogel. Part of the water absorbs a large amount of heat and then evaporates to form water vapor. The accumulation of water vapor can form a water vapor layer with good heat insulation effect, thereby improving the heat insulation and heat absorption effects of the heat absorbing component 100.
[0125] It can be understood that the heat absorption component 100 including the hydrogel in the heat absorption medium 30 not only has a heat insulation effect, but can also absorb a large amount of heat during the evaporation process of water, and can be applied to scenarios with large heat generation such as thermal runaway of battery cells.
[0126] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.
Claims
1. A heat absorption component, characterized in that: The heat absorption component comprises a packaging sleeve, the packaging sleeve is filled with at least one heat absorption element, and the inner cavity of the at least one heat absorption element is filled with a heat absorption medium; The heat absorbing member is used to release the internal heat absorbing medium when the pressure applied to the heat absorbing component and / or the heat absorbing member exceeds a preset threshold, so that the heat absorbing medium fills the inner cavity of the packaging sleeve.
2. The heat absorption component according to claim 1, characterized in that: The compression strength of the packaging sleeve is greater than the compression strength of the heat absorbing element.
3. The heat absorption component according to claim 1, characterized in that: The packaging sleeve is filled with a plurality of the heat absorbing members, and gaps are respectively provided between the plurality of the heat absorbing members. The released heat absorbing medium is used to fill the gaps between the plurality of the heat absorbing members.
4. The heat absorption component according to claim 1, characterized in that: The heat absorber also includes a shell, which includes at least two packaging layers, wherein one packaging layer is used to form an inner cavity of the heat absorber, and another packaging layer is used to cover the packaging layer forming the inner cavity, and there is a gap between two adjacent packaging layers, and the released heat absorption medium is also used to fill the gap between the at least two packaging layers.
5. The heat absorption component according to claim 4, characterized in that: In a direction away from the inner cavity of the heat absorption component, the compressive strength of the at least two packaging layers tends to increase.
6. The heat absorption component according to claim 4, characterized in that: The number of the encapsulation layers is less than or equal to four.
7. The heat absorption component according to claim 4, characterized in that: Each packaging layer is provided with a weak portion, and the compressive strength of the weak portion is less than the compressive strength of the packaging layer body; and / or The thickness of the weak portion is smaller than the thickness of the packaging layer body.
8. The heat absorption component according to claim 7, characterized in that: Each packaging layer is respectively provided with a plurality of weak parts, the plurality of weak parts of each packaging layer are spaced apart from each other, and the plurality of weak parts of two adjacent packaging layers are staggered.
9. The heat absorption component according to claim 7, characterized in that: The ratio of the compressive strength of the weak portion to the compressive strength of the packaging layer body is in the range of 0.5-0.8; and / or The ratio of the thickness of the weak portion to the thickness of the packaging layer body is in the range of 0.5-0.
8.
10. The heat absorption component according to claim 4, characterized in that: The ratio of the inner cavity volume of the relatively outer encapsulation layer to the inner cavity volume of the relatively inner encapsulation layer of two adjacent encapsulation layers is in the range of 1.05-1.
50.
11. The heat absorption component according to claim 4, characterized in that: The gap between two adjacent packaging layers is a vacuum.
12. The heat absorption component according to claim 4, characterized in that: The housing includes multiple packaging layers, the multiple packaging layers include a first packaging layer and multiple second packaging layers, the first packaging layer forms an inner cavity of the heat absorbing element, the heat absorbing medium is filled in the inner cavity of the heat absorbing element, the multiple second packaging layers are sequentially covered with each other, and the innermost second packaging layer covers the first packaging layer; There is a gap between the first encapsulation layer and the second encapsulation layer and / or between two adjacent second encapsulation layers, and the released heat absorption medium is also used to fill the gap.
13. The heat absorption component according to any one of claims 1 to 12, characterized in that: There is a gap between the at least one heat absorbing member and the packaging sleeve, and the released heat absorbing medium is used to fill the gap between the packaging sleeve and the at least one heat absorbing member.
14. The heat absorption component according to claim 13, characterized in that: The gap between the packaging sleeve and the at least one heat absorbing element is a vacuum.
15. The heat absorption component according to any one of claims 1 to 12, characterized in that: The heat absorption assembly comprises a bracket, wherein: The bracket is located in the inner cavity of the heat absorbing element; and / or The bracket is located between the packaging sleeve and the heat absorbing element.
16. A battery, characterized in that: It comprises a battery core and the heat absorption component according to any one of claims 1 to 15, wherein the heat absorption component is used for heat insulation and heat absorption of the battery core.