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CN-122025934-A - Heat insulation assembly, battery pack and electric equipment

CN122025934ACN 122025934 ACN122025934 ACN 122025934ACN-122025934-A

Abstract

The application relates to the technical field of batteries, in particular to a heat insulation assembly, a battery pack and electric equipment, wherein the heat insulation assembly comprises an encapsulation part, the encapsulation part is provided with an encapsulation cavity, the heat insulation part is positioned in the encapsulation cavity and comprises mixed fiber yarns and aerogel, the fiber yarns have a diameter D mu m, the heat insulation part has a thickness Dmm, the heat insulation part has an emissivity epsilon, and the emissivity epsilon is more than or equal to 0.223 and less than or equal to 54.802. The application obviously reduces the thermal runaway diffusion speed of adjacent batteries and improves the safety performance of the battery pack.

Inventors

  • ZHANG YONGJIE
  • HOU AISHENG
  • NIU LI

Assignees

  • 中创新航科技集团股份有限公司

Dates

Publication Date
20260512
Application Date
20260413

Claims (20)

  1. 1. An insulation assembly, comprising: -a package (110), the package (110) having a package cavity; A thermal insulation member (120) positioned in the packaging cavity, wherein the thermal insulation member (120) comprises mixed fiber wires (121) and aerogel, the fiber wires (121) have a diameter D mu m, the thermal insulation member (120) has a thickness Dmm, and the thermal insulation member (120) has an emissivity epsilon and meets the conditions that epsilon/D is more than or equal to 0.223 and less than or equal to 54.802.
  2. 2. The insulation assembly of claim 1, wherein the filaments (121) have a length amm and satisfy 5mm +. amm +.20 mm.
  3. 3. The insulation assembly according to claim 1, characterized in that the mass content of the filaments (121) in the insulation (120) is 0.5% -10%.
  4. 4. The insulation assembly of claim 1, wherein the ratio of the mass content of the fiber filaments (121) in the insulation (120) to the mass content of the aerogel in the insulation (120) is 0.0065-0.2.
  5. 5. The insulation assembly of claim 1, wherein at least a portion of the aerogel particles are located between the filaments (121), and wherein voids are formed between adjacent two of the aerogel particles.
  6. 6. The insulation assembly of claim 5, wherein the pores have a pore size of bnm and satisfy a pore size of 2 nm≤bnm≤70 nm.
  7. 7. The insulation assembly of claim 1, wherein the fiber filaments (121) comprise at least one of glass fibers, ceramic fibers, basalt fibers.
  8. 8. The insulation assembly of claim 7, wherein the fiber filaments (121) comprise glass fibers and ceramic fibers, the ratio of the mass content of the glass fibers in the insulation (120) to the mass content of the ceramic fibers in the insulation (120) being 1-150.
  9. 9. The insulation assembly of claim 1, wherein the aerogel comprises at least one of silica aerogel, fumed silica, alumina aerogel, zirconia aerogel.
  10. 10. The insulation assembly of claim 1, wherein the insulation (120) further comprises an opacifier comprising at least one of carbon black, silicon carbide, titanium dioxide, zirconium silicate, zirconium oxide.
  11. 11. The insulation assembly according to claim 10, wherein the mass ratio of the opacifying agent in the insulation (120) is 10% -40%.
  12. 12. The insulation assembly according to any of claims 1 to 11, wherein 3 μm≤dμm≤30μm, and/or, Dmm < 0.5mm < 10mm, and/or, 0.7≤ε≤0.95。
  13. 13. The insulation assembly according to any one of claims 1-11, wherein the insulation (120) has two oppositely disposed insulation faces; the package (110) wraps the heat insulation part (120), the package (110) comprises a first tail collecting section (111) and a second tail collecting section (112), the length directions of the first tail collecting section (111) and the second tail collecting section (112) are consistent with the length directions of the heat insulation components, the first tail collecting section (111) and the second tail collecting section (112) are mutually overlapped to form an overlapped section (115), and along the thickness direction of the heat insulation components, the projection of the overlapped section (115) is positioned on the heat insulation surface.
  14. 14. The insulation assembly according to claim 13, characterized in that the width of the overlap section (115) is between 5mm-25mm along the width of the insulation face.
  15. 15. The insulation assembly of claim 13, wherein the overlapping section (115) at least partially coincides with the center of the battery (210) along the thickness direction of the insulation assembly; the overlapping sections (115) have a width of between 5mm and 23mm along the width of the insulation assembly.
  16. 16. The insulation assembly of claim 13, wherein the enclosure (110) further comprises a third end-receiving section (113) and a fourth end-receiving section (114), the third end-receiving section (113) and the fourth end-receiving section (114) having a length direction that is aligned with a width direction of the insulation assembly; at least part of the third (113) and fourth (114) tail-receiving sections covers the overlap section (115).
  17. 17. The insulation assembly according to any of claims 1-11, wherein the single layer thickness of the encapsulation (110) is between 50 μιη and 200 μιη.
  18. 18. The insulation assembly according to any one of claims 1-11, further comprising at least two securing members (130), at least two of said securing members (130) being provided at opposite ends of the insulation assembly in the length and/or width direction, respectively.
  19. 19. The insulation assembly of claim 18, wherein the insulation assembly has a first face (101), the first face (101) comprising a fixed zone and an exposed zone (1011), the exposed zone (1011) being intermediate the first face (101) to expose a portion of the insulation, the fixed zone being located on a peripheral side of the first face (101); The fixing piece (130) is attached to the fixing area.
  20. 20. The insulation assembly of claim 18, wherein at least two of the fasteners (130) are spaced apart along the width of the insulation assembly.

Description

Heat insulation assembly, battery pack and electric equipment Technical Field The application relates to the technical field of batteries, in particular to a heat insulation assembly, a battery pack and electric equipment. Background With the rapid development of new energy technology, the battery pack is used as a core energy module in the fields of electric automobiles, energy storage systems, aerospace and the like, and the energy density requirement is continuously improved. In the process of conception and implementation of the application, the applicant finds that at least the following problems exist that at present, the existing heat insulation pad cannot effectively block heat in a high-temperature state of a battery, so that adjacent batteries are easily affected when the batteries are in thermal runaway, heat spreading is caused, and the use safety of the batteries is affected. The foregoing description is provided for general background information and does not necessarily constitute prior art. Disclosure of Invention The application mainly aims to provide a heat insulation assembly, a battery pack and electric equipment, which obviously reduce the thermal runaway diffusion speed of adjacent batteries and improve the safety performance of the battery pack. To achieve the above object, the present application provides an insulation assembly comprising: a package having a package cavity; And the heat insulation piece is positioned in the packaging cavity, comprises mixed fiber filaments and aerogel, wherein the fiber filaments have a diameter D mu m, the heat insulation piece has a thickness Dmm, and the heat insulation piece has emissivity epsilon and meets the conditions that epsilon/D is more than or equal to 0.223 and less than or equal to 54.802. In addition, the application provides a battery pack comprising at least two batteries and the heat insulation assembly; The heat insulation assembly is arranged between at least part of two adjacent batteries. In addition, the application provides electric equipment, which comprises the battery pack. The application has the advantages that the heat radiation transmission path is effectively restrained by optimizing the ratio of (epsilon) D/D, the time of heat spreading between adjacent batteries is slowed down, the integral use safety of the batteries is ensured, the mechanical strength of the fiber yarn ensures the long-term stability of the layered structure, and the structural strength and the service life of the heat insulation piece are ensured. Finally, the technical means obviously reduces the thermal runaway diffusion speed of the adjacent battery in the high-temperature environment with the temperature of more than 600 ℃, prolongs the service life of the heat insulation piece after 1000 charge and discharge cycles, obviously delays or prevents heat from spreading to the adjacent battery, and improves the safety performance of the battery pack. Drawings In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art. Fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present application; FIG. 2 is a schematic view of a portion of a thermal shield assembly according to an embodiment of the present application; FIG. 3 is a schematic view of a heat shield in a heat shield assembly according to an embodiment of the present application; FIG. 4 is an electron microscope image of a heat insulation assembly provided by an embodiment of the application, wherein the heat insulation assembly comprises fiber filaments; FIG. 5 is an electron micrograph of microscopic voids of an aerogel in a thermal insulation assembly provided in an embodiment of the present application; FIG. 6 is an electron microscope image of a thermal insulation assembly provided by an embodiment of the present application containing a opacifying agent; FIG. 7 is a schematic view of a heat insulation assembly according to an embodiment of the present application; FIG. 8 is a schematic diagram illustrating an assembly of a heat insulating member and a package according to an embodiment of the present application; Fig. 9 is a schematic structural diagram of a first view angle of a battery according to an embodiment of the present application; Fig. 10 is a schematic structural diagram of a second view angle of a battery according to an embodiment of the present application. Reference numerals illustrate: 100-an insulation assembly; 110-packaging; 111-a first tail section; 112-a second tail-receiving section; 113-a third tail-receiving s