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CN-122025935-A - Heat insulation pad for battery and battery pack

CN122025935ACN 122025935 ACN122025935 ACN 122025935ACN-122025935-A

Abstract

The application discloses a heat insulation pad for a battery and a battery pack, and belongs to the technical field of batteries, wherein the heat insulation pad for the battery comprises aerogel and a light shielding agent, the light shielding agent can absorb and scatter infrared radiation, the aerogel comprises a plurality of particles, gaps are formed among the particles of the aerogel, and the light shielding agent comprises a plurality of particles; the extinction coefficient of the heat insulation plate is Mm 2 /kg, the average particle diameter of particles of the opacifier is a mu M, the heat insulation plate comprises two opposite target surfaces, the thickness of the heat insulation plate is Dmm, the thickness of the heat insulation plate is the dimension of the heat insulation plate along the direction perpendicular to the large surface of the heat insulation plate, and the range of a/(MxD) is 0.0015-5.8441. The application can improve the good blocking effect of the heat insulation pad for the battery on heat radiation, heat conduction and heat convection, improve the heat blocking capability of the heat insulation pad for the battery, ensure the structural strength of the heat insulation pad for the battery, and avoid structural collapse to influence the service life of the heat insulation pad for the battery.

Inventors

  • 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. The heat insulation pad for the battery is characterized by comprising a heat insulation pad body, wherein the heat insulation pad body comprises a heat insulation plate (310), the heat insulation plate (310) comprises aerogel (312) and a light shielding agent (311), the light shielding agent (311) can absorb and scatter infrared radiation, the aerogel (312) comprises a plurality of particles, pores are formed among the particles of the aerogel (312), gaps of the aerogel (312) can block heat conduction, and the light shielding agent (311) comprises a plurality of particles; The extinction coefficient of the heat insulation plate (310) is Mm 2 /kg, the average particle diameter of particles of the opacifying agent (311) is a mu M, the heat insulation plate (310) comprises two opposite target surfaces, the thickness of the heat insulation plate (310) is Dmm, the thickness of the heat insulation plate (310) is the dimension of the heat insulation plate (310) along the direction vertical to the target surfaces, and the range of a/(MxD) is 0.0015-5.8441; the target surface of the heat shield (310) is the surface of the heat shield (310) with the largest area.
  2. 2. The heat insulating mat for a battery according to claim 1, wherein the light shielding agent (311) comprises one or more of carbon black, silicon carbide, titanium dioxide, zirconium silicate, and zirconium oxide.
  3. 3. The heat insulating mat for a battery according to claim 1, wherein the particles of the light shielding agent (311) have an average particle diameter a μm in the range of 1 μm to 15 μm.
  4. 4. The heat insulating mat for a battery according to claim 1, wherein the mass content of the light shielding agent (311) in the heat insulating plate (310) is 10% -40%.
  5. 5. The heat insulating mat for a battery according to claim 1, wherein the heat insulating board (310) is formed by mixing the light shielding agent (311) and the aerogel (312), and a/(M x D) is in the range of 0.0040 to 5.8441.
  6. 6. The heat insulating mat for a battery according to claim 1, wherein the heat insulating board (310) includes at least a first heat insulating layer (3110) and a second heat insulating layer (3120), the first heat insulating layer (3110) containing the light shielding agent (311), the second heat insulating layer (3120) containing the aerogel (312).
  7. 7. The heat insulating mat for a battery according to claim 6, wherein the first heat insulating layer (3110) is coated on the surface of the second heat insulating layer (3120).
  8. 8. The heat insulating mat for a battery according to claim 6, wherein the heat insulating board (310) further comprises a third heat insulating layer (3130), the third heat insulating layer (3130) contains a light shielding agent (311), and the second heat insulating layer (3120) is provided between the first heat insulating layer (3110) and the third heat insulating layer (3130).
  9. 9. The heat insulating mat for a battery according to claim 6, wherein the heat insulating board (310) further comprises a fourth heat insulating layer (3140), the fourth heat insulating layer (3140) containing aerogel (312), and the first heat insulating layer (3110) is disposed between the second heat insulating layer (3120) and the fourth heat insulating layer (3140).
  10. 10. The heat insulating mat for a battery according to claim 6, wherein the thickness of the first heat insulating layer (3110) is 0.02mm to 1mm; And/or the number of the groups of groups, The thickness of the second heat insulation layer (3120) is 0.3 mm-7 mm.
  11. 11. The battery insulation mat of any of claims 1-10, wherein the aerogel (312) composition comprises one or more of silica aerogel, fumed silica, alumina aerogel, zirconia aerogel.
  12. 12. The heat insulating mat for a battery according to claim 11, wherein the pore size of pores formed between particles of the aerogel (312) is in the range of 2nm to 70nm.
  13. 13. The heat insulating mat for a battery according to claim 11, wherein the mass content of the aerogel (312) in the heat insulating plate (310) is in the range of 50% -80%.
  14. 14. The battery insulation mat of any of claims 1-10, wherein the insulation panel (310) further comprises filaments (313), the composition of the filaments (313) comprising one or more of glass fibers, ceramic fibers, basalt fibers.
  15. 15. The heat insulating mat for a battery according to claim 14, wherein the mass content of the fiber filaments (313) in the heat insulating plate (310) is 0.5 to 10%.
  16. 16. The heat insulating mat for a battery according to any one of claims 1 to 10, wherein said heat insulating mat body further comprises an insulating encapsulation layer (330), and said heat insulating plate (310) is encapsulated in said insulating encapsulation layer (330).
  17. 17. The heat insulating mat for a battery according to claim 16, wherein the thickness of the insulating encapsulation layer (330) is 50 μm to 200 μm; And/or the number of the groups of groups, The thermal conductivity of the insulating encapsulation layer (330) is 0.1W/(m.K) to 0.7W/(m.K).
  18. 18. The battery insulation blanket of claim 16, wherein the insulating encapsulation layer (330) includes at least two terminal ends, the two terminal ends overlapping to form an overlap region (331), the overlap region (331) being located on a target surface of the insulation blanket (310).
  19. 19. The heat insulating mat for a battery according to claim 18, wherein a ratio of an area of the overlap region (331) to a large area of the heat insulating plate (310) is 0.02 to 0.4.
  20. 20. The heat insulating mat for a battery according to any one of claims 1 to 10, wherein the value range of Mm 2 /kg is 5m 2 /kg~70m 2 /kg; And/or the number of the groups of groups, The value range of Dmm is 0.5 mm-10 mm.

Description

Heat insulation pad for battery and battery pack Technical Field The application relates to the technical field of batteries, in particular to a heat insulation pad for a battery and a battery pack. Background As the demand for battery endurance increases, the energy density of the battery increases. The battery with higher energy density has higher temperature in thermal runaway, and the common heat insulation pad has poor heat insulation effect under the high temperature condition, so that the adjacent battery is subjected to rapid thermal runaway, and heat spreading is caused. Therefore, how to improve the heat insulation effect and prevent the adjacent cells from rapid thermal runaway to cause heat spreading is a problem to be solved by those skilled in the art. Disclosure of Invention Accordingly, the present application is directed to a heat insulation pad for a battery, which can improve the heat insulation effect and prevent the adjacent battery from rapid thermal runaway to cause heat spreading; another object of the present application is to provide a battery pack having the above heat insulating mat for a battery. In order to achieve the above purpose, the present application provides the following technical solutions: A first aspect of the present application provides a heat insulating mat for a battery, comprising a heat insulating mat body including a heat insulating plate including an aerogel and a light shielding agent, the light shielding agent being capable of absorbing and scattering infrared radiation, the aerogel including a plurality of particles, gaps being formed between the particles of the aerogel, the gaps of the aerogel being capable of blocking heat conduction, the light shielding agent including a plurality of particles; The extinction coefficient of the thermal insulation plate is Mm 2/kg, the average particle size of particles of the opacifier is a mu M, the thermal insulation plate comprises two opposite target surfaces, the thickness of the thermal insulation plate is Dmm, the thickness of the thermal insulation plate is the dimension of the thermal insulation plate along the direction perpendicular to the target surfaces, and the range of a/(MxD) is 0.0015-5.8441; the target surface of the heat insulation plate is the surface with the largest area of the heat insulation plate. According to the heat insulation pad for the battery, disclosed by the application, the light shielding agent is added into the heat insulation plate, and can absorb infrared radiation generated by heat radiation of the battery, so that radiation heat transfer between adjacent batteries is reduced. Aerogel is doped in the heat insulation plate, and because gaps are arranged among particles, the aerogel can block heat conduction and heat convection. According to the application, the average particle diameter a mu M of the opacifier, the extinction coefficient Mm 2/kg of the heat insulation plate and the thickness Dmm of the heat insulation plate are controlled, so that a/(MxD) is selected within the range of 0.0015-5.8441, thereby improving the good blocking effect of the heat insulation pad for the battery on heat radiation, heat conduction and heat convection, improving the heat blocking capability of the heat insulation pad for the battery, ensuring the structural strength of the heat insulation pad for the battery, avoiding the structural collapse of the heat insulation pad for the battery and influencing the service life of the heat insulation pad for the battery. The application has the advantages that the a/(M multiplied by D) is selected within the range of 0.0015-5.8441, the problems that the average particle size of the opacifier is too small, or the extinction coefficient of the heat insulation plate is too large, the opacifier is too high, the particles of the opacifier are easy to agglomerate, the mechanical property is poor, the service life is shortened and the like caused by too much content of the opacifier are avoided, and the problems that the barrier property to radiant heat is weakened, the thermal runaway temperature exceeds 600 ℃ and the heat generated by heat radiation is relatively large, and the adjacent cells are rapidly subjected to thermal runaway are also avoided. A second aspect of the present application provides a battery pack comprising the heat insulating mat for a battery as set forth in any one of the above and at least two batteries, the heat insulating mat for a battery being located between target surfaces of adjacent two of the batteries. The battery pack disclosed in the above technical scheme has all the technical effects of the heat insulation pad for the battery because of the heat insulation pad for the battery, and is not described herein again. Drawings In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art wi