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CN-122003756-A - Thermal barrier pad, battery pack and battery module

CN122003756ACN 122003756 ACN122003756 ACN 122003756ACN-122003756-A

Abstract

A thermal barrier mat is provided that includes a porous insulating absorber having a first major surface and a second major surface, a heat absorbing solution composition absorbed in the insulating absorber, a thermally conductive sheet covering at least one of the first major surface and the second major surface of the insulating absorber, and a heat sink pocket surrounding the insulating absorber and the thermally conductive sheet and comprising a metal layer, wherein the heat absorbing solution composition includes from about 0.20 wt% to about 0.45 wt% of a surfactant, from about 0.3 wt% to about 5.0% wt% of a thickener, and from about 60 wt% to about 80 wt% of water.

Inventors

  • Jin Shanzai
  • Kang Lilan
  • REN CHENGBIN
  • LI ZHENGUI
  • LI XIULIAN

Assignees

  • 株式会社LG新能源

Dates

Publication Date
20260508
Application Date
20250408
Priority Date
20240510

Claims (15)

  1. 1. A thermal barrier pad comprising: A porous, thermally insulating absorbent material having a first major surface and a second major surface; An endothermic solution composition absorbed in the heat insulating absorbing material; A heat conductive sheet covering at least one of the first main surface and the second main surface of the heat insulating and absorbing material, and A heat radiation pouch surrounding the heat insulating absorbing material and the heat conductive sheet and including a metal layer, Wherein the endothermic solution composition comprises: about 0.20 wt to about 0.45 wt% surfactant; about 0.3 wt to about 5.0 wt% of a thickener, and About 60 wt to about 80 wt% water.
  2. 2. The thermal barrier pad of claim 1, wherein the thickener comprises carboxymethyl cellulose (CMC), carboxyethyl cellulose, polyvinyl alcohol (PVA), starch, polyethylene oxide (PEO), hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, or glucomannan.
  3. 3. The thermal barrier pad of claim 1, wherein the endothermic solution composition comprises about 15 wt% to about 35 wt% of an antifreeze.
  4. 4. The thermal barrier pad of claim 3, wherein the antifreeze comprises CaCl 2 , naCl, potassium acetate, potassium formate, isopropyl alcohol, butyl diglycol, ethylene glycol, diethylene glycol, dipropylene glycol, propylene glycol, urea, and/or glycerin.
  5. 5. The thermal barrier pad of claim 3, wherein the endothermic solution composition comprises about 20wt% to about 30 wt% of an antifreeze.
  6. 6. The thermal barrier pad of claim 3, wherein the endothermic solution composition comprises about 23 wt% to about 27 wt% of an antifreeze.
  7. 7. The thermal barrier pad of claim 1, wherein the endothermic solution composition comprises about 0.5 wt to about 3 wt% thickener.
  8. 8. The thermal barrier pad of claim 1, wherein the endothermic solution composition comprises about 1 wt. % to about 2.2 wt% of a thickener.
  9. 9. The thermal barrier pad of claim 1, wherein the surfactant is a silicon (Si) based surfactant.
  10. 10. The thermal barrier pad of claim 9, wherein the surfactant comprises Polydimethylsiloxane (PDMS).
  11. 11. The thermal barrier pad of claim 1, wherein the thermally conductive sheet comprises copper, aluminum, zinc, tin, iron, or alloys thereof.
  12. 12. The thermal barrier pad of claim 11, wherein the thermally conductive sheet is a copper sheet or a copper alloy sheet and the thermally conductive sheet has a thickness of about 5 μιη to about 50 μιη.
  13. 13. The thermal barrier pad of claim 1, wherein the thermally insulating absorbent material comprises a nonwoven fabric based on silica fibers.
  14. 14. A battery pack, comprising: Assembling a box; a plurality of secondary batteries accommodated in the pack case and stacked in a first direction, and The thermal barrier pad of claim 1, the thermal barrier pad disposed between the plurality of secondary batteries.
  15. 15. A battery module, comprising: a module case; a plurality of secondary batteries accommodated in the module case and stacked in a first direction, and The thermal barrier pad of claim 1, the thermal barrier pad disposed between the plurality of secondary batteries.

Description

Thermal barrier pad, battery pack and battery module Technical Field The present disclosure relates to a thermal barrier pad, a battery pack, and a battery module, and more particularly, to a thermal barrier pad capable of effectively preventing or delaying heat generated from a battery cell from being transferred to other battery cells adjacent thereto, and a battery pack and a battery module including the thermal barrier pad. The present application claims priority from korean patent application No. 10-2024-0062086 filed on day 105 of 2024 and korean patent application No. 10-2025-0003705 filed on day 1 of 2025, the disclosures of which are incorporated herein by reference in their entireties. Background The secondary battery refers to a chargeable and dischargeable battery, which is different from a primary battery that cannot be charged, and is widely used in electronic devices such as mobile phones, notebook computers, video cameras, or electric vehicles. In particular, lithium secondary batteries have a larger capacity than nickel-cadmium batteries or nickel-hydrogen batteries, and have a high energy density per unit weight, and thus the utilization rate is rapidly increasing. Various structures and/or manufacturing methods have been proposed and applied to manufacture secondary batteries, and various means for improving the quality of secondary batteries have been devised. Disclosure of Invention Technical problem A first technical problem addressed by the present disclosure is to provide a thermal barrier pad that may effectively prevent or delay the transfer of heat generated from a battery cell to an adjacent other battery cell. A second technical problem addressed by the present disclosure is to provide a battery pack including a thermal barrier mat that can effectively prevent or delay the transfer of heat generated from a battery cell to an adjacent other battery cell. A third technical problem addressed by the present disclosure is to provide a battery module including a thermal barrier mat that can effectively prevent or delay the transfer of heat generated from a battery cell to an adjacent other battery cell. Technical proposal To address the first technical problem, the present disclosure provides a thermal barrier mat comprising a porous insulating absorbent material having a first major surface and a second major surface, a heat absorbing solution composition absorbed in the insulating absorbent material, a thermally conductive sheet covering at least one of the first major surface and the second major surface of the insulating absorbent material, and a heat sink pocket surrounding the insulating absorbent material and the thermally conductive sheet and comprising a metal layer, wherein the heat absorbing solution composition comprises from about 0.20 wt% to about 0.45 wt% of a surfactant, from about 0.3 wt% to about 5.0 wt% of a thickener, and from about 60 wt% to about 80 wt% of water. In some embodiments, the thickener may include carboxymethyl cellulose (CMC), carboxyethyl cellulose, polyvinyl alcohol (PVA), starch, polyethylene oxide (PEO), hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, or glucomannan. In some embodiments, the endothermic solution composition may include from about 15 wt% to about 35% wt% of an antifreeze. In some embodiments, the antifreeze may include CaCl 2, naCl, potassium acetate, potassium formate, isopropyl alcohol, butyl diglycol, ethylene glycol, diethylene glycol, dipropylene glycol, propylene glycol, urea, and/or glycerin. In some embodiments, the endothermic solution composition may include from about 20 wt% to about 30 wt% of an antifreeze. In some embodiments, the endothermic solution composition may include from about 23 wt% to about 27% wt% of an antifreeze. In some embodiments, the endothermic solution composition may include from about 0.5 wt% to about 3wt% thickener. In some embodiments, the endothermic solution composition may include from about 1 wt% to about 2.2% wt% thickener. In some embodiments, the surfactant may be a silicon (Si) based surfactant. In some embodiments, the surfactant may include Polydimethylsiloxane (PDMS). In some embodiments, the thermally conductive sheet may include copper, aluminum, zinc, tin, iron, or alloys thereof. In some embodiments, the thermally conductive sheet may be a copper sheet or a copper alloy sheet, and the thermally conductive sheet may have a thickness of about 5 μm to about 50 μm. In some embodiments, the heat insulating and absorbing material may include a non-woven fabric having silica fibers as a main component. In order to achieve the second technical problem, the present disclosure provides a battery pack including a pack case, a plurality of secondary batteries accommodated in the pack case and stacked in a first direction, and a thermal barrier pad disposed between the plurality of secondary batteries. In order to achieve the third technical problem, the present disc