Heat absorption part, battery pack and electric equipment

Abstract

The utility model relates to the technical field of battery packs, in particular to a heat absorption piece, a battery pack and electric equipment. The heat absorption piece comprises a base body, a plurality of holes are formed in the base body, and at least part of the holes are filled with phase change materials. The porosity of the base body is larger than or equal to 10% and smaller than or equal to 80%.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a heat absorbing component, a battery pack and an electrical device. Background Art

[0002] A battery pack usually includes multiple cells, which are spaced apart. If one of the cells has a thermal runaway problem, the heat from the cell will spread to other cells, posing a safety hazard to the entire battery pack.

[0003] In the prior art, in order to suppress the spread of heat from thermal runaway cells, aerogel is placed between two adjacent cells to slow down the heat transfer rate. However, aerogel can only slow down the heat transfer rate and cannot fundamentally solve the problem of heat diffusion. Utility Model Content

[0004] The utility model provides a heat absorbing component, a battery pack and an electrical device to solve or at least partially solve the problem existing in the prior art that, when a battery cell in a battery pack has a thermal runaway problem, aerogel can only slow down the heat transfer speed but cannot fundamentally solve the problem of heat diffusion.

[0005] In order to solve the above technical problems, the utility model is achieved as follows:

[0006] In a first aspect, the utility model discloses a heat absorbing component, which includes: a substrate, wherein the substrate has a plurality of pores, at least some of the pores are filled with a phase change material; and the porosity of the substrate is greater than or equal to 10% and less than or equal to 80%.

[0007] Optionally, the porosity of the matrix is ​​greater than or equal to 30% and less than or equal to 60%.

[0008] Optionally, the pores include a first pore, the first pores include a plurality of first pores, and the plurality of first pores are arranged at intervals; each of the first pores is filled with the phase change material.

[0009] Optionally, the phase change material is a spherical structure, and a diameter of the spherical structure is greater than or equal to 2 mm and less than or equal to 5 mm.

[0010] Optionally, the distance between two adjacent phase change materials is greater than or equal to 0 mm and less than or equal to 10 mm.

[0011] Optionally, the pores further include a second pore, the size of the second pore being smaller than the size of the first pore.

[0012] Optionally, a ratio of the porosity of the second pores to the porosity of the matrix is ​​greater than or equal to 0.1 and less than or equal to 0.3.

[0013] Optionally, the second pore includes a circular hole, and when the deformable material is a spherical structure and the second pore is a circular hole, the ratio of the diameter of the second pore to the diameter of the phase change material is greater than or equal to 0.01 and less than or equal to 0.1.

[0014] Optionally, the second pores are arranged around the phase change material.

[0015] Optionally, along a direction extending from the center of the phase change material toward the outer wall of the phase change material, the porosity of the second pores gradually increases.

[0016] Optionally, the phase change material includes hydrogel, and / or the matrix includes at least one of a PP board, a PE board and a PU board.

[0017] In a second aspect, the utility model further discloses a battery pack, comprising at least two battery cells spaced apart from each other; the heat absorbing member described in the first aspect is disposed between two adjacent battery cells.

[0018] Optionally, the battery cell is a rectangular structure, the length of the side of the battery cell close to the adjacent battery cell is x, the width is y, and the thickness of the battery cell along the direction in which two adjacent battery cells are spaced apart is z; wherein, 70≤x≤1500, 30≤y≤500, 6≤z≤50, and the units of x, y and z are all mm.

[0019] Optionally, the heat absorption member is also a rectangular parallelepiped structure, the length of the side of the heat absorption member close to the battery core is a, the width is b, and the thickness of the heat absorption member along the direction in which two adjacent battery cells are spaced apart is c; wherein, (x-60)≤a≤x, (y-60)≤b≤y, 1≤c≤10, and the units of a, b and c are all mm.

[0020] Optionally, when the phase change material is a spherical structure, the diameter of the phase change material is d, wherein 0.1c≤d≤0.9c.

[0021] In a third aspect, the utility model further discloses an electric device, which includes an electric device body and the battery pack described in the second aspect, wherein the battery pack is connected to the electric device body.

[0022] The utility model discloses a heat absorber, a battery pack and an electrical device, wherein the heat absorber includes a substrate, wherein the substrate has a plurality of pores, and some of the pores are filled with phase change materials. In addition, the porosity of the substrate is greater than or equal to 10% and less than or equal to 80%. The heat absorber disclosed in the utility model includes a substrate, wherein the substrate has a plurality of pores, and some of the pores are filled with phase change materials, so that the heat dissipated by the thermal runaway of the battery cell is absorbed by the phase change materials to suppress the diffusion of heat. In addition, the substrate can fix the phase change materials, so that the heat absorber is more structural and the mechanical properties of the heat absorber are enhanced.

[0023] Furthermore, by setting the porosity of the matrix to be greater than or equal to 10% and less than or equal to 80%, the gas released during the heat absorption process of the phase change material can be effectively discharged from the pores, thereby further improving the reliability of the heat absorption element. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of the heat absorbing element in an embodiment of the utility model is shown.

[0025] Reference numerals:

[0026] 10: matrix; 11: pore; 111: first pore; 112: second pore. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be understood that the references to "one embodiment" or "an embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present invention. Therefore, the references to "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0029] Reference Figure 1 , shows a schematic structural diagram of the heat absorbing component described in an embodiment of the utility model.

[0030] like Figure 1As shown, an embodiment of the utility model discloses a heat absorber, which includes a substrate 10, wherein the substrate 10 has a plurality of pores 11 arranged at intervals, and at least some of the pores 11 are filled with a phase change material; the porosity of the substrate 10 is greater than or equal to 10% and less than or equal to 80%.

[0031] The present utility model discloses a heat absorbing member, which can be arranged in a battery pack. Specifically, the battery pack includes a plurality of battery cells, and the plurality of battery cells are arranged at intervals, and the heat absorbing member is arranged between two adjacent battery cells. Of course, the above are only individual examples of the use of the heat absorbing member, and are not intended to limit the use of the heat absorbing member.

[0032] like Figure 1 As shown, the heat absorber includes a substrate 10, and the substrate 10 has a plurality of pores 11. Specifically, the substrate 10 can be one of a foamed PP board, a PE board or a PU board. Of course, the substrate 10 can also be any other material with a deformation amount less than 20% under a pressure of 0.5 MPa and a heat-resistant temperature greater than or equal to 140 degrees. In the embodiment of the utility model, there are no excessive restrictions on the specific material of the substrate 10. In actual applications, technicians can select a suitable material as the substrate 10 as needed.

[0033] In the embodiment of the utility model, a phase change material is filled in part of the pores 11 to absorb the heat dissipated by the thermal runaway of the battery cell through the phase change material to inhibit the heat diffusion. Specifically, the phase change material can be a hydrogel, and the hydrogel is filled in part of the pores 11. When the battery cell is in thermal runaway, the water in the hydrogel heats up and vaporizes, absorbing the heat dissipated by the battery cell, inhibiting the heat from diffusing to other battery cells, and improving the overall safety of the battery pack.

[0034] In the prior art, when a battery cell experiences thermal runaway, the heat generating area of ​​the battery cell will expand significantly, squeezing the aerogel disposed outside the battery cell, causing the aerogel to deform, thereby reducing the heat absorption effect of the heat generating area and affecting the heat absorption of the aerogel.

[0035] The heat absorber disclosed in the embodiment of the utility model is provided with a plurality of pores 11 in the base 10, and a phase change material is filled in some of the pores 11, so that the phase change material is fixed by the base 10, so that the heat absorber is more structural and the mechanical properties of the heat absorber are enhanced.

[0036] Furthermore, in an embodiment of the utility model, the porosity of the substrate 10 is set to be greater than or equal to 10% and less than or equal to 80%, so that the gas released during the heat absorption process of the phase change material can be effectively discharged from the pores 11, and the phase change material can stably absorb heat, inhibit thermal diffusion of the battery cell, and improve the reliability of the heat absorption component.

[0037] For example, the porosity of the substrate 10 can be set to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, etc. In this regard, the embodiment of the utility model does not impose specific restrictions. In actual applications, technicians can set the porosity of the substrate 10 to any value between greater than or equal to 10% and less than or equal to 80% as needed.

[0038] It should be noted that the porosity of the substrate 10 in the embodiment of the present invention refers to the percentage of the volume of the pores 11 in the substrate 10 to the total volume of the substrate 10 in the natural state.

[0039] Preferably, in the embodiment of the present invention, the porosity of the substrate 10 can be set to be greater than or equal to 30% and less than or equal to 60%.

[0040] In the embodiment of the utility model, the porosity of the matrix 10 is set to be greater than or equal to 30% and less than or equal to 60%, so that the gas released during the heat absorption process of the phase change material can be better discharged from the pores 11. At the same time, the matrix 10 can also better fix the phase change material, and the structural and mechanical properties of the heat absorber are better.

[0041] Alternatively, if Figure 1 As shown, the pores 11 in the embodiment of the utility model include a first pore 111 , and the first pore 111 includes a plurality of first pores 111 , and the plurality of first pores 111 are arranged at intervals; each first pore 111 is filled with the phase change material.

[0042] like Figure 1 As shown, the pores 11 in the embodiment of the utility model include a first pore 111, and the first pore 111 includes a plurality of first pores 111, and the plurality of first pores 111 are arranged at intervals in the substrate 10. Moreover, each first pore 111 is filled with a phase change material. Thus, the heat dissipated by the battery cell can be absorbed by the plurality of phase change materials arranged at intervals, and the heat is inhibited from spreading to other battery cells, thereby improving the safety of the battery pack.

[0043] Optionally, the phase change material in the embodiment of the present invention is a spherical structure, and the diameter of the spherical structure is greater than or equal to 2 mm and less than or equal to 5 mm.

[0044] like Figure 1 As shown, the phase change material in the embodiment of the utility model can be set as a spherical structure. And the diameter of the spherical structure is set to be greater than or equal to 2 mm and less than or equal to 5 mm. Exemplarily, the diameter of the spherical structure can be set to 2 mm, 3 mm, 4 mm, 5 mm, etc.

[0045] It should be noted that the shape and size of the first pore 111 in the embodiment of the present invention are adapted to the shape and size of the phase change material. For example, when the shape-changing material is a spherical structure, and the diameter of the spherical structure is 3 mm, the shape of the first pore 111 can also be set to a circular hole, and the diameter of the circular hole can be set to 3 mm or slightly larger than 3 mm, so that the phase change structure can be placed in the first pore 111.

[0046] Of course, the above method of setting the phase change material to a spherical structure is only an individual example of the embodiment of the utility model, and is not intended to limit the structure of the phase change material. In actual applications, technicians can also set the phase change material to a cube structure, a rectangular parallelepiped structure, etc. as needed.

[0047] Optionally, in the embodiment of the utility model, the distance between two adjacent phase change materials is greater than or equal to 0 mm and less than or equal to 10 mm.

[0048] In an embodiment of the utility model, the distance between two adjacent phase change materials is set to be greater than or equal to 0 mm and less than or equal to 10 mm, so that a sufficient amount of phase change material can be arranged in the matrix 10 to absorb the heat dissipated by thermal runaway of the battery cell, inhibit the heat from spreading to other battery cells, and improve the safety of the battery pack.

[0049] For example, in the embodiment of the present invention, the distance between two adjacent phase change materials can be set to 0mm, 2mm, 4mm, 6mm, 8mm, 10mm, etc. Of course, the above are only individual examples of the distance between two adjacent phase change materials and are not intended to be limiting of the present invention. In actual applications, technicians can set the distance between two adjacent phase change materials to any value greater than or equal to 0mm and less than or equal to 10mm as needed.

[0050] Alternatively, if Figure 1 As shown, the pore 11 in the embodiment of the utility model further includes a second pore 112 , and the size of the second pore 112 is smaller than the size of the first pore 111 .

[0051] The pores 11 in the embodiment of the utility model include second pores 112, through which the gas generated during the heat absorption process of the phase change material is discharged. That is, the main function of the second pore 112 is to exhaust gas. In the embodiment of the utility model, the size of the second pore 112 is set to be smaller than the size of the first pore 111, so as to facilitate the discharge of the gas generated during the heat absorption process of the phase change material. Among them, since the first pore 111 contains the phase change material, it can be understood that the size of the second pore 112 is set to be smaller than the size of the first pore 111, that is, the size of the second pore 112 is set to be smaller than the size of the phase change material.

[0052] Optionally, the ratio of the porosity of the second pores 112 to the porosity of the matrix 10 is greater than or equal to 0.1 and less than or equal to 0.3.

[0053] like Figure 1 As shown, in the embodiment of the present invention, the ratio of the porosity of the second pores 112 to the porosity of the matrix 10 is set to be greater than or equal to 0.1 and less than or equal to 0.3, so that the gas released during the heat absorption process of the phase change material can be better discharged.

[0054] For example, the ratio of the porosity of the second pores 112 to the porosity of the matrix 10 may be set to 0.1, 0.15, 0.2, 0.25, 0.3, and so on.

[0055] It should be noted that the porosity of the second pores 112 in the embodiment of the present invention refers to the percentage of the volume of the second pores 112 in the matrix 10 to the total volume of the matrix 10 in a natural state.

[0056] Optionally, the second pore 112 includes a circular hole, and when the phase change material is a spherical structure and the second pore 112 is a circular hole, the ratio of the diameter of the second pore 112 to the diameter of the phase change material is greater than or equal to 0.01 and less than or equal to 0.1. Further, when the first pore 111 is also a circular hole, the ratio of the diameter of the second pore 112 to the diameter of the first pore 111 also satisfies the requirement of being greater than or equal to 0.01 and less than or equal to 0.1.

[0057] In the embodiment of the utility model, the second pore 112 can be set as a circular hole. When the second pore 112 is a circular hole and the phase change material is a spherical structure, the ratio of the diameter of the circular hole to the diameter of the phase change material is set to be greater than or equal to 0.01 and less than or equal to 0.1, so that the gas released during the heat absorption process of the phase change material can be better discharged.

[0058] For example, when the second pore 112 is a circular hole and the phase change material is a spherical structure, the ratio of the diameter of the circular hole to the diameter of the phase change material can be set to 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, etc.

[0059] It should be noted that the above method of setting the second pore 112 as a round hole is only an individual example of an embodiment of the utility model and is not intended to be a limitation of the utility model. In actual applications, technicians can set the second pore 112 to any shape as needed. For example, the second pore 112 can be set to a round hole, the second pore 112 can be set to a square hole, or the second pore 112 can be set to a special-shaped hole.

[0060] Optionally, the second pores 112 are disposed around the phase change material, which can ensure that the second pores are exhausted in time, thereby improving the exhaust efficiency.

[0061] Furthermore, along the direction extending from the center of the phase change material toward the outer wall of the phase change material, the porosity of the second pores 112 gradually increases.

[0062] In the embodiment of the utility model, the second pore 112 is arranged around the phase change material. When the phase change material is a spherical structure, the porosity of the second pore 112 gradually increases along the direction extending from the center of the phase change material toward the outer wall of the phase change material, that is, from the center of the sphere of the phase change material to the outer wall of the phase change material. It can be understood that the porosity of the second pore 112 is small at a position close to the phase change material, and the porosity of the second pore 112 is large at a position far away from the phase change material. Through the above arrangement, the gas released during the heat absorption process of the phase change material can be better discharged.

[0063] It should be noted that, in the embodiment of the present invention, the second pore 112 may be filled with a phase change material or may not be filled with a phase change material. In the embodiment of the present invention, there is no specific restriction on whether the second pore 112 is filled with a phase change material. In actual applications, technicians can choose to fill the second pore 112 with a phase change material or not fill the second pore 112 with a phase change material as needed.

[0064] The utility model also discloses a battery pack, which includes at least two battery cells arranged at intervals. The heat absorbing member described in the above embodiment is arranged between two adjacent battery cells.

[0065] The utility model also discloses a battery pack, which includes at least two battery cells, and the at least two battery cells are arranged at intervals. The heat absorbing member in the above embodiment is arranged between two adjacent battery cells, and the phase change material in the heat absorbing member absorbs the heat dissipated by the thermal runaway of the battery cell, thereby inhibiting the heat from spreading to other battery cells, thereby improving the safety of the battery pack.

[0066] Furthermore, the heat absorbing component has good structural and mechanical properties, so that the heat absorbing effect of the heat generating area of ​​the thermal runaway battery cell is better.

[0067] Optionally, the battery cell is a rectangular structure, the length of the side of the battery cell close to the adjacent battery cell is x, the width is y, and the thickness of the battery cell along the direction in which two adjacent battery cells are spaced apart is z; wherein, 70≤x≤1500, 30≤y≤500, 6≤z≤50, and the units of x, y and z are all mm.

[0068] In order to make the area of ​​the side of the heat absorber close to the battery cell and the area of ​​the side of the battery cell close to another battery cell closer, that is, the area of ​​the side of the heat absorber close to the battery cell and the area of ​​the large surface of the battery cell are closer, so that the heat absorption effect of the heat absorber is better. In the embodiment of the utility model, when the battery cell is a rectangular parallelepiped structure, the heat absorber is also set to a rectangular parallelepiped structure. The length of the side of the battery cell close to the adjacent battery cell is set to x, the width of the side of the battery cell close to the adjacent battery cell is set to y, and the thickness of the battery cell is set to z along the direction of the interval between two adjacent battery cells. Among them, 70≤x≤1500, 30≤y≤500, 6≤z≤50, and the units of x, y and z are all mm.

[0069] Exemplarily, the length x of the side of the battery cell close to the adjacent battery cell can be set to 70mm, 200mm, 400mm, 600mm, 800mm, 1000mm, 1200mm, 1500mm, etc. The width y of the side of the battery cell close to the adjacent battery cell can be set to 30mm, 100mm, 200mm, 300mm, 400mm, 500mm, etc. Along the direction in which two adjacent battery cells are spaced apart, the thickness z of the battery cell can be set to 6mm, 10mm, 20mm, 30mm, 40mm, 50mm, etc.

[0070] Optionally, the heat absorption member is also a rectangular parallelepiped structure, the length of the side of the heat absorption member close to the battery core is a, the width is b, and the thickness of the heat absorption member along the direction in which two adjacent battery cells are spaced apart is c; wherein, (x-60)≤a≤x, (y-60)≤b≤y, 1≤c≤10, and the units of a, b and c are all mm.

[0071] In the embodiment of the utility model, the length of the side of the heat absorbing member close to the battery cell is set to a, and the width of the side of the heat absorbing member close to the battery cell is set to b. And along the direction in which two adjacent battery cells are spaced apart, the thickness of the heat absorbing member is set to c. Wherein, (x-60)≤a≤x, (y-60)≤b≤y, 1≤c≤10, and the units of a, b and c are all mm.

[0072] Exemplarily, when the length x of the side of the battery cell close to the adjacent battery cell is 400mm, the width y of the side of the battery cell close to the adjacent battery cell is 200mm, and the thickness of the battery cell is 30mm along the direction in which the two adjacent battery cells are spaced apart. The length a of the side of the heat absorber close to the battery cell is greater than or equal to 340mm and less than or equal to 400mm. Specifically, the length of the side of the heat absorber close to the battery cell can be set to 340mm, 360mm, 380mm, 400mm, etc. The width b of the side of the heat absorber close to the battery cell is greater than or equal to 140mm and less than or equal to 200mm. Specifically, the width of the side of the heat absorber close to the battery cell can be set to 140mm, 160mm, 180mm, 200mm, etc.

[0073] Along the direction of the interval between two adjacent battery cells, the thickness c of the heat absorption component can be set to be greater than or equal to 1 mm and less than or equal to 10 mm. Specifically, along the direction of the interval between two adjacent battery cells, the thickness c of the heat absorption component can be set to 1 mm, 3 mm, 6 mm, 9 mm, 10 mm, etc.

[0074] Optionally, when the phase change material is a spherical structure, the diameter of the phase change material is d, wherein 0.1c≤d≤0.9c.

[0075] In the embodiment of the utility model, when the phase change material is a spherical structure, the diameter of the phase change material is set to d, and the diameter d of the phase change material is greater than or equal to 0.1c and less than or equal to 0.9c, so that the phase change material can be set in the matrix 10, and the matrix 10 supports the phase change material.

[0076] For example, when the phase change material is a spherical structure, if the thickness c of the heat absorber is 10 mm along the direction of the spacing between two adjacent battery cells, the diameter of the phase change material is greater than or equal to 1 mm and less than or equal to 9 mm. Specifically, the diameter of the phase change material can be set to 1 mm, 3 mm, 5 mm, 7 mm, 9 mm, etc.

[0077] The embodiment of the utility model further discloses an electric device, which includes an electric device body and the battery pack described in the above embodiment, wherein the battery pack is connected to the electric device body.

[0078] It should be noted that in the embodiment of the utility model, the battery pack included in the electrical equipment has the same structure as the battery pack described in the above embodiment, and its beneficial effects are also similar, which will not be described in detail here.

[0079] In addition, the electrical equipment body in the embodiment of the utility model can be a vehicle or other electrical equipment. In the embodiment of the utility model, there is no restriction on the specific type of the electrical equipment body, and in actual application, the technician can select it according to the needs.

[0080] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0081] Although the optional embodiments of the utility model embodiments have been described, those skilled in the art, once knowing the basic creative concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including optional embodiments and all changes and modifications falling within the scope of the utility model embodiments.

[0082] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0083] The technical solution provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the present invention. At the same time, for those skilled in the art, according to the principle and implementation method of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A heat absorbing element, characterized in that: include: A substrate (10), wherein the substrate (10) has a plurality of pores (11), and at least some of the pores (11) are filled with a phase change material; The porosity of the matrix (10) is greater than or equal to 10% and less than or equal to 80%.

2. The heat absorbing element according to claim 1, characterized in that: The porosity of the matrix (10) is greater than or equal to 30% and less than or equal to 60%.

3. The heat absorbing element according to claim 1, characterized in that: The pores (11) include a first pore (111), the first pores (111) include a plurality of first pores (111), and the plurality of first pores (111) are arranged at intervals; Each of the first pores (111) is filled with the phase change material.

4. The heat absorbing element according to claim 3, characterized in that: The phase change material is a spherical structure, and the diameter of the spherical structure is greater than or equal to 2 mm and less than or equal to 5 mm.

5. The heat absorbing element according to claim 4, characterized in that: The distance between two adjacent phase change materials is greater than or equal to 0 mm and less than or equal to 10 mm.

6. The heat absorbing element according to claim 3, characterized in that: The pores (11) further include second pores (112), the size of the second pores (112) being smaller than the size of the first pores (111).

7. The heat absorbing element according to claim 6, characterized in that: The ratio of the porosity of the second pores (112) to the porosity of the matrix (10) is greater than or equal to 0.1 and less than or equal to 0.

3.

8. The heat absorbing element according to claim 6, characterized in that: The second pore (112) comprises a circular hole. When the phase change material is a spherical structure and the second pore (112) is a circular hole, the ratio of the diameter of the second pore (112) to the diameter of the phase change material is greater than or equal to 0.01 and less than or equal to 0.

1.

9. The heat absorbing element according to claim 6, characterized in that: The second pores (112) are arranged around the phase change material.

10. The heat absorbing element according to claim 9, characterized in that: Along the direction extending from the center of the phase change material toward the outer wall of the phase change material, the porosity of the second pores (112) gradually increases.

11. The heat absorbing element according to any one of claims 1 to 10, characterized in that: The phase change material includes a hydrogel; And / or, the substrate includes at least one of a PP board, a PE board and a PU board.

12. A battery pack, characterized in that: include: At least two battery cells arranged at intervals; The heat absorbing member according to any one of claims 1 to 11, wherein the heat absorbing member is arranged between two adjacent battery cells.

13. The battery pack according to claim 12, characterized in that: The battery cell is a rectangular parallelepiped structure, the length of the side of the battery cell close to the adjacent battery cell is x, the width is y, and the thickness of the battery cell along the direction in which two adjacent battery cells are spaced apart is z; Among them, 70≤x≤1500, 30≤y≤500, 6≤z≤50, and the units of x, y and z are all mm.

14. The battery pack according to claim 13, characterized in that: The heat absorbing member is also a rectangular parallelepiped structure, the length of the side of the heat absorbing member close to the battery core is a, the width is b, and the thickness of the heat absorbing member along the direction in which two adjacent battery cores are spaced apart is c; Among them, (x-60)≤a≤x, (y-60)≤b≤y, 1≤c≤10, and the units of a, b and c are all mm.

15. The battery pack according to claim 14, characterized in that: When the phase change material is a spherical structure, the diameter of the phase change material is d, wherein 0.1c≤d≤0.9c.

16. An electrical equipment, characterized in that: It comprises an electrical device body and a battery pack according to any one of claims 12 to 15, wherein the battery pack is connected to the electrical device body.

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