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CN-122025956-A - Battery pack and electricity utilization device

CN122025956ACN 122025956 ACN122025956 ACN 122025956ACN-122025956-A

Abstract

The embodiment of the application provides a battery pack and an electric device. The battery pack comprises at least two battery cells, heat insulation plates, wherein the at least two battery cells are sequentially arranged along a first direction, the heat insulation plates are arranged between two adjacent battery cells, the heat insulation plates have a first thickness dimension D1mm in the first direction, the heat insulation plates comprise aerogel, a plurality of pores are arranged in the aerogel, the average pore diameter value of the pores is Tmm, and the area ratio of the heat insulation plates to the adjacent battery cells in the first direction is A, wherein the area ratio of 6 x 10 3 ≤D1*A/T≤5265*10 3 . According to the battery pack and the power utilization device, 6 x 10 3 ≤D1*A/T≤5265*10 3 are limited, so that on one hand, the heat insulation plate can have a good heat insulation effect, heat transfer between two adjacent battery monomers is blocked, further, the condition that a plurality of battery monomers are out of control in a linkage thermal manner is reduced, the safety of the battery pack can be improved, and on the other hand, the battery pack can have a good space utilization rate, and the energy density of the battery pack is improved.

Inventors

  • NIU LI
  • HOU AISHENG

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. A battery pack is characterized by comprising, At least two battery cells (100), the at least two battery cells (100) being arranged in sequence along a first direction; A heat insulating plate (200), wherein the heat insulating plate (200) is arranged between the first surfaces of two adjacent battery cells (100); The heat insulation plate (200) has a first thickness dimension D1mm in the first direction, wherein the heat insulation plate (200) comprises aerogel, a plurality of pores are arranged in the aerogel, and the average pore diameter value of the pores is Tmm; The area ratio of the heat insulation plate (200) to the adjacent battery cells (100) in the first direction is A, wherein 6x 10 3 ≤D1*A/T≤5265*10 3 .
  2. 2. The battery pack according to claim 1, wherein D1mm is 0.5mm 10mm, and/or A is 0.7 mm 1.3 mm, and/or 2 x 10 -6 mm≤Tmm≤70*10 -6 mm.
  3. 3. The battery pack according to claim 1, wherein a spacer (300) is provided between at least one side of the heat shield (200) along the first direction and the adjacent battery cell (100), both sides of the spacer (300) along the first direction are respectively attached to the heat shield (200) and the battery cell (100), the spacer (300) extends along a second direction, and the second direction is perpendicular to the first direction; The separator (300) is used to form a redundant space (400) between the adjacent heat insulation plates (200) and the battery cells (100).
  4. 4. The battery pack according to claim 3, wherein the number of the spacers (300) is at least two, and the at least two spacers (300) are stacked in the first direction and/or arranged in a third direction perpendicular to the first direction and the second direction.
  5. 5. The battery pack according to claim 3, wherein when the insulating board (200) is provided with the spacer (300) on one side in the first direction, the insulating board (200) is further provided with a glue layer (500), and the glue layer (500) and the spacer (300) are respectively located on both sides of the insulating board (200) in the first direction; the adhesive layer (500) is used for bonding the heat insulation plate (200) and the adjacent battery cells (100).
  6. 6. The battery pack according to claim 3, wherein the separator (300) has a first width dimension M1mm in a third direction perpendicular to the first and second directions, and the heat shield (200) has a second width dimension M2mm in the third direction, wherein a ratio of the first width dimension M1mm to the second width dimension M2mm is 0.05-0.3.
  7. 7. The battery pack according to claim 3, wherein the separator (300) has a distance M3mm from the side of the heat shield plate (200) in a third direction perpendicular to the first and second directions, wherein M3 mm≤5 mm.
  8. 8. The battery pack according to any one of claims 1 to 7, wherein the heat insulating plate (200) comprises a heat insulating layer and an insulating encapsulation cover (220) wrapped outside the heat insulating layer.
  9. 9. The battery pack according to claim 8, wherein the insulating package skin (220) has a first end-receiving section and a second end-receiving section on one side of the heat shield (200) in the first direction, the first end-receiving section and the second end-receiving section forming an overlap region (225) in the first direction; The overlap region (225) has a third width dimension M4mm in a third direction, the third direction being perpendicular to the second direction, wherein 5 mm≤M4mm≤25mm.
  10. 10. The battery pack according to claim 9, wherein the overlap region (225) is located at a middle portion of the heat shield plate (200) in the third direction, wherein 5 mm≤m4mm≤20mm.
  11. 11. The battery pack according to any one of claims 1 to 7 and 9 to 10, wherein the heat shield (200) has a second thickness dimension D2mm at a side perpendicular to the first direction, and the heat shield (200) has a third thickness dimension D3mm at a center region perpendicular to the first direction, wherein D2mm < D1mm, D2mm > D3mm.
  12. 12. The battery of claim 11, wherein 0.1 mm≤D2 mm-D3 mm≤2 mm.
  13. 13. The battery pack according to any one of claims 1-7, 9-10 and 12, wherein the heat shield (200) comprises at least one of a fiber yarn and a light shielding agent.
  14. 14. The battery of claim 13, wherein the fiber filaments comprise at least one of glass fibers and ceramic fibers; And/or the opacifier comprises at least one of silicon carbide, carbon black, titanium oxide, zirconium silicate and zirconium oxide.
  15. 15. The battery pack of claim 13, wherein the fiber filaments have a diameter in the range of 3 μm to 30 μm; And/or the particle size of the opacifier ranges from 1 μm to 15 μm.
  16. 16. The battery pack according to claim 13, wherein the aerogel is contained in the insulating board (200) in an amount of 50% -80%; And/or the content of the fiber yarn in the heat insulation board (200) is 0.5-10%; and/or the content of the opacifier in the heat insulation plate (200) is 10-40%.
  17. 17. The battery pack of claim 13, wherein the insulating panel (200) comprises a gel, the gel and the aerogel being in a mixed arrangement.
  18. 18. The battery pack according to any one of claims 1-7, 9-10, 12 and 14-17, wherein the battery cells (100) comprise two opposing first surfaces, the first surfaces being large surfaces, and the heat shield (200) is disposed between the first surfaces of adjacent two of the battery cells (100), wherein 10 x 10 3 ≤D1*A/T≤5265*10 3 .
  19. 19. The battery pack according to claim 18, wherein at least one end of the heat shield (200) extends beyond the first surface of the battery cell (100); The distance that at least one end of the heat insulation plate (200) exceeds the surface of the battery monomer (100) is L1mm, wherein L1mm is more than or equal to 0.1mm and less than or equal to 5mm.
  20. 20. The battery pack according to claim 19, wherein the battery cell (100) has a first end face in a direction perpendicular to the first direction, the first end face having a post assembly (101 a) provided thereon; At least one end of the heat insulation plate (200) protrudes from the first end face along the direction perpendicular to the first end face.

Description

Battery pack and electricity utilization device Technical Field The application relates to the technical field of batteries, in particular to a battery pack and an electric device. Background The battery pack generally includes a plurality of battery cells, and the plurality of battery cells are sequentially arranged and electrically connected in series and/or parallel. When a certain battery monomer in the battery pack is in a thermal runaway condition, the heat of the battery monomer can be quickly transferred to the adjacent battery monomer, so that the heat can quickly spread in the battery pack, and the safety of the battery pack is affected. Disclosure of Invention The embodiment of the application provides a battery pack and an electricity utilization device, which can reduce the transmission efficiency of heat in the battery pack, further reduce the occurrence of the condition of chain thermal runaway of a plurality of battery monomers and improve the safety of the battery pack. In a first aspect, embodiments of the present application provide a battery pack, comprising, The battery comprises at least two battery cells, wherein the at least two battery cells are sequentially arranged along a first direction; the heat insulation plate is arranged between the first surfaces of two adjacent battery monomers; The heat insulation plate has a first thickness dimension D1mm in the first direction, comprises aerogel, wherein a plurality of pores are arranged in the aerogel, and the average pore diameter value of the pores is Tmm; The area ratio of the heat insulation plate to the adjacent battery cells in the first direction is A, wherein 6 x 10 3≤D1*A/T≤5265*103. In a second aspect, an embodiment of the present application provides an electrical device, including a battery pack as described above. According to the battery pack and the power utilization device, 6 x 10 3≤D1*A/T≤5265*103 are limited, so that on one hand, the heat insulation plate can have a good heat insulation effect, heat transfer between two adjacent battery monomers is blocked, further, the condition that a plurality of battery monomers are out of control in a linkage thermal manner is reduced, the safety of the battery pack can be improved, and on the other hand, the battery pack can have a good space utilization rate, and the energy density of the battery pack is improved. Drawings The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. FIG. 1 is a schematic view of a portion of an embodiment of the present application showing a first heat shield disposed between two adjacent cells; FIG. 2 is a schematic view of a spacer provided on a side of a heat shield adjacent a first cell in accordance with some embodiments of the present application; FIG. 3 is a schematic view of a separator provided on a side of a heat shield adjacent to a second cell in accordance with some embodiments of the present application; fig. 4 and fig. 5 are schematic views of a spacer provided on both sides of a heat insulation board along a first direction according to some embodiments of the present application, where the spacer includes a plurality of adhesive strips; FIG. 6 is a schematic view of a heat shield according to some embodiments of the present application; FIG. 7 is a schematic view of a heat shield provided in some embodiments of the present application having a separator disposed on a side of the heat shield adjacent to a first cell and a glue layer disposed on a side of the heat shield adjacent to a second cell; FIG. 8 is a schematic view of a portion of an embodiment of the present application wherein a thermal shield is provided with a glue layer on a side adjacent to a first cell and a spacer on a side adjacent to a second cell; FIG. 9 is a schematic view of a heat shield with an encapsulating skin wrapped around the heat shield according to some embodiments of the present application; FIG. 10 is a schematic view of a heat shield placed on an enclosure in an expanded state according to some embodiments of the present application; FIG. 11 is a schematic view of a portion of an embodiment of the present application providing a heat shield between adjacent cells, the heat shield having a second thickness dimension on a side perpendicular to the first direction, the heat shield having a third thickness dimension in a central region perpendicular to the first direction, the second thickness dimension being greater than the third thickness dimension; FIG. 12 is a schematic view of a portion of an embodiment of the present application providing a heat shield between adjacent cells, the heat shield having at least one flange perpendicular to a first direction, the flange protruding from a surface of the cell perpendicular to the first direction; Fig. 13 is a schematic arran