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CN-224204168-U - Multifunctional composite breathing film, heat insulation assembly, battery module and battery pack

CN224204168UCN 224204168 UCN224204168 UCN 224204168UCN-224204168-U

Abstract

The utility model discloses a multifunctional composite breathing film, a heat insulation assembly, a battery module and a battery pack, wherein the multifunctional composite breathing film comprises a phase change layer and a heat insulation packaging film wrapped outside the phase change layer, and a temperature sensing adhesive coating is arranged on the outer surface of the heat insulation packaging film; the phase-change layer is in liquid state in the working temperature range of the battery core, and the viscosity of the temperature-sensitive adhesive coating gradually weakens along with the temperature rise. According to the multifunctional composite breathing film provided by the utility model, the temperature-sensitive adhesive coating of the outer layer is bonded with the battery cell, the inner phase-change layer can completely meet the swelling brought by the large surface of the battery cell during charging and discharging, and the breathing film can be automatically adjusted according to the swelling degree of different areas on the large surface of the battery cell, so that the whole large surface of the battery cell is under the same pre-tightening pressure, the attenuation of the battery cell is improved, and the cycle life of the battery pack is greatly prolonged. Meanwhile, the heat insulation packaging film has excellent heat insulation blocking performance, and can effectively isolate thermal runaway cells from heat spreading.

Inventors

  • SUN ZHENGYANG

Assignees

  • 上海轩邑新能源发展有限公司

Dates

Publication Date
20260505
Application Date
20250522

Claims (10)

  1. 1. A multifunctional composite breathing film is characterized by comprising a phase-change layer (11) and a heat-insulating packaging film (12) wrapped outside the phase-change layer (11), wherein a temperature-sensitive adhesive coating (13) is arranged on the outer surface of the heat-insulating packaging film (12), the phase-change layer (11) is in a liquid state within the working temperature range of an electric core, and the viscosity of the temperature-sensitive adhesive coating (13) is gradually weakened along with the rising of the temperature.
  2. 2. The multifunctional composite respiratory film according to claim 1, wherein a plurality of micro-patch type temperature sensors (14) are arranged in the phase change layer (11).
  3. 3. The multifunctional composite respiratory membrane according to claim 1, wherein a plurality of micro patch-type pressure sensors (15) are arranged in the phase change layer (11).
  4. 4. The multifunctional composite respiratory film according to claim 1, wherein the outer surface of the temperature sensitive adhesive coating (13) is covered with a peelable release paper (16).
  5. 5. The multifunctional composite respiratory film according to claim 1, wherein the temperature sensitive adhesive coating (13) is made of a poly-N-isopropyl acrylamide material or an acrylonitrile-methacrylate copolymer.
  6. 6. Multifunctional composite respiratory film according to claim 1, wherein the phase-change layer (11) is made of paraffin, fatty acid or saline compounds.
  7. 7. The multifunctional composite breathing film according to claim 1, characterized in that the heat insulation packaging film (12) is an aluminum foil film, a PET reflective film or a phase change type heat insulation film.
  8. 8. An insulation assembly comprising a multifunctional composite respiratory membrane according to any one of claims 1-7.
  9. 9. A battery module comprising a plurality of cells (2), wherein a heat insulation pad is arranged between any two adjacent cells (2), and the battery module is characterized in that the heat insulation pad adopts the multifunctional composite breathing film as claimed in any one of claims 1 to 7.
  10. 10. A battery pack comprising the battery module according to claim 9.

Description

Multifunctional composite breathing film, heat insulation assembly, battery module and battery pack Technical Field The utility model relates to the technical field of power batteries, in particular to a multifunctional composite breathing film, a heat insulation assembly, a battery module and a battery pack. Background At present, a new energy automobile is basically provided with a power battery pack and is basically a lithium ion battery core. The battery cell needs to better exert the charge and discharge characteristics under a certain pretightening force range. Therefore, in order to charge and discharge the battery cells in a comfortable environment, certain pretightening force is needed, when the battery cells are integrated into a module, materials such as a hard PC sheet, aerogel, elastic foam and the like can be additionally arranged among the battery cells to provide a certain pretightening force range, and meanwhile, the materials also play a role in blocking heat insulation during thermal runaway, so that heat spreading among the battery cells is prevented. When the modules are assembled, heat insulation is carried out among the battery cells by using a hard PC sheet or an aerogel sheet, but the hard PC sheet and the aerogel sheet have no compressibility, the middle and later periods of charging and discharging the modules (or battery packs) are unfriendly, and the service life of the whole pack can be greatly reduced. When the elastic foam material is used for heat insulation between the battery cells, the foam has certain compressibility and elasticity, so that the expansion brought by charging and discharging of the battery cells can be absorbed. However, because the large surface of the battery cell is larger, the expansion is not uniform, the large surface of the battery cell can have different local bulge degrees, and the elastic foam material can only passively accept the pressure compression caused by the expansion of the battery cell, and the large surface of the battery cell can not be actively regulated to ensure that the stress of the large surface of the battery cell is uniform, and the service life of the battery pack can be reduced after long-term lasting. Because the heat insulation materials among the electric cores are respectively bonded with the large surfaces of the electric cores by adopting strong back glue, the heat insulation materials are difficult to tear during the later-stage after-sale echelon utilization, and are extremely inconvenient. Disclosure of utility model Based on the above, the utility model provides a multifunctional composite breathing film, a heat insulation assembly, a battery module and a battery pack, aiming at the technical problem that a hard PC sheet, an aerogel sheet or an elastic foam material is used as a heat insulation material among battery cells in the battery pack at present. In order to achieve the above purpose, the present utility model adopts the following technical scheme: The utility model provides a multifunctional composite breathing film which comprises a phase-change layer and a heat-insulating packaging film wrapping the phase-change layer, wherein a temperature-sensitive adhesive coating is arranged on the outer surface of the heat-insulating packaging film, the phase-change layer is in a liquid state in the working temperature range of a battery cell, and the viscosity of the temperature-sensitive adhesive coating is gradually weakened along with the rise of the temperature. As a further improvement of the scheme, a plurality of micro-patch type temperature sensors are arranged in the phase change layer. As a further improvement of the scheme, a plurality of micro patch type pressure sensors are arranged in the phase change layer. As a further improvement of the above proposal, the outer surface of the temperature sensitive adhesive coating is covered with a peelable release paper. As a further improvement of the scheme, the temperature sensitive adhesive coating is made of a poly-N-isopropyl acrylamide material or an acrylonitrile-methacrylate copolymer. As a further improvement of the above, the phase change layer is made of paraffin, fatty acid or salt water compound. As a further improvement of the above scheme, the heat insulation packaging film is an aluminum foil film, a PET reflective film or a phase change type heat insulation film. The utility model also provides a heat insulation assembly which comprises the multifunctional composite breathing film. The utility model also provides a battery module, which comprises a plurality of electric cores, wherein a heat insulation pad is arranged between any two adjacent electric cores, and the heat insulation pad adopts the multifunctional composite breathing film. The utility model also provides a battery pack, which comprises the battery module Compared with the prior art, the utility model has the following beneficial effects: According to the multifunctional composite