Scholarlink

<p>With the continuous development of battery technology for new energy vehicles (NEVs), there are increasingly high demands for power battery sealants to achieve lightweight and energy absorption capabilities. In this work, a series of polyurethane prepolymers (PUPs) with different R values (NCO/OH molar ratio) were prepared by solvent-free method with diphenylmethane diisocyanate (MDI-50) and polytetrahydrofuran glycol (PTMG-2000), and the flow viscosity of PUPs with different R values was studied. The PUP with R-value of 4.5 exhibited a flow viscosity of 3560.54 mm<sup>2</sup>/s, which is suitable for subsequent experiments. Based on PUP with R values of 4.5, a series of polyurethane power battery sealants (PPBSs) with different chain extension coefficients were successfully prepared, and the comprehensive effects of different chain extension coefficients on the micromorphology, thermal stability, mechanical properties, and adhesive strength of PPBSs were systematically investigated. Impressively, the PPBS with a chain extension coefficient of 85% (PPBS-85) demonstrated optimal comprehensive properties, exhibiting uniformly dense foam cell distribution and high thermal stability. The PPBS-85 exhibited a tensile strength of 3.45&#xa0;MPa, an elongation at break of 480.18%, a Shore A hardness of 52 HA, a compressive stress of 1.89&#xa0;MPa at 50% compression, and a hysteresis energy density (HED) 2.470&#xa0;J/m<sup>3</sup> under 50% loading strain, demonstrating excellent comprehensive mechanical performance. Compared to PET film substrates, PPBSs exhibited higher adhesive strength to 304 steel substrates. The PPBS-85 reached a maximum lap shear force of 744.59&#xa0;N to 304 steel substrates, with a lap shear strength of 2.38&#xa0;MPa. The method of optimizing the foaming volume of PPBSs by adjusting chain extension coefficients is expected to effectively address both energy absorption and lightweight requirements for power battery applications, demonstrating significant potential in structural design.</p> Graphical abstract <p></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Preparation of lightweight and energy absorption polyurethane power battery sealants

  • 期刊论文

  • 发表日期：

    2025年5月28日

查看全文
  • Xiongzhuang Gao,
  • Xingyuan Ma,
  • Xinyuan Xue,
  • Lu Lin

摘要

With the continuous development of battery technology for new energy vehicles (NEVs), there are increasingly high demands for power battery sealants to achieve lightweight and energy absorption capabilities. In this work, a series of polyurethane prepolymers (PUPs) with different R values (NCO/OH molar ratio) were prepared by solvent-free method with diphenylmethane diisocyanate (MDI-50) and polytetrahydrofuran glycol (PTMG-2000), and the flow viscosity of PUPs with different R values was studied. The PUP with R-value of 4.5 exhibited a flow viscosity of 3560.54 mm2/s, which is suitable for subsequent experiments. Based on PUP with R values of 4.5, a series of polyurethane power battery sealants (PPBSs) with different chain extension coefficients were successfully prepared, and the comprehensive effects of different chain extension coefficients on the micromorphology, thermal stability, mechanical properties, and adhesive strength of PPBSs were systematically investigated. Impressively, the PPBS with a chain extension coefficient of 85% (PPBS-85) demonstrated optimal comprehensive properties, exhibiting uniformly dense foam cell distribution and high thermal stability. The PPBS-85 exhibited a tensile strength of 3.45 MPa, an elongation at break of 480.18%, a Shore A hardness of 52 HA, a compressive stress of 1.89 MPa at 50% compression, and a hysteresis energy density (HED) 2.470 J/m3 under 50% loading strain, demonstrating excellent comprehensive mechanical performance. Compared to PET film substrates, PPBSs exhibited higher adhesive strength to 304 steel substrates. The PPBS-85 reached a maximum lap shear force of 744.59 N to 304 steel substrates, with a lap shear strength of 2.38 MPa. The method of optimizing the foaming volume of PPBSs by adjusting chain extension coefficients is expected to effectively address both energy absorption and lightweight requirements for power battery applications, demonstrating significant potential in structural design.

Graphical abstract