Liquid absorbing sheet and nonaqueous electrolyte battery pack

• US 20090148776A1
• Filed: 02/04/2009
• Published: 06/11/2009
• Est. Priority Date: 05/30/2003
• Status: Abandoned Application

• Current Assignee: Sony Chemical & Information Device Corporation (Sony Group Corp.)
• Original Assignee: Sony Chemical & Information Device Corporation (Sony Group Corp.)
• Inventors: Hatsuda, Kouki, Fujita, Yasuhiro, Nomura, Mamiko, Moriyama, Hironobu
• Application Number:
  US12/320,769
• Publication Number:
  US 20090148776A1
• Time in Patent Office: Days
• US Class Current: 429/249
• CPC Class Codes: C08F 290/06 Polymers provided for in subclass C08G
• CPC Class Codes: C08F 290/061 Polyesters; Polycarbonates
• CPC Class Codes: C08F 290/065 Polyamides; Polyesteramides; Polyimides
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]

Abstract

A liquid absorbing sheet has a liquid-absorbing resin layer that can effectively absorb the nonaqueous electrolyte solution used in nonaqueous electrolyte secondary cells that make nonaqueous electrolyte battery packs (in particular, lithium ion-based nonaqueous secondary battery packs). The liquid-absorbing resin layer is obtained by irradiating a particular monomer composition with UV rays or other energy rays to polymerize the monomer composition. The monomer composition contains a monofunctional monomer component (A) having a polyethylene glycol acrylate monomer and an amide bond-containing acrylic monomer; and a polyfunctional monomer component (B).

Claims

1. A liquid absorbing sheet for absorbing a nonaqueous electrolyte solution, comprising:

a liquid-absorbing resin layer capable of absorbing a nonaqueous electrolyte solution and shows adhesion, wherein the liquid-absorbing resin layer comprises a polymer of a monomer composition, the monomer composition containing;

a monofunctional monomer component (A) comprising a polyethylene glycol acrylate monomer and an amide bond-containing acrylic monomer; and

a polyfunctional monomer component (B).

2. The liquid absorbing sheet according to claim 1, wherein the polyethylene glycol acrylate monomer is phenoxypolyethylene glycol acrylate or methoxypolyethylene glycol acrylate.

3. The liquid absorbing sheet according to claim 1, wherein the amide bond-containing acrylic monomer is acryloylmorpholine or N,N-diethylacrylamide.

4. The liquid absorbing sheet according to claim 1, wherein the liquid-absorbing resin layer is formed over a substrate.

5. The liquid absorbing sheet according to claim 4, wherein the substrate is capable of absorbing and retaining a nonaqueous electrolyte solution.

6. The liquid absorbing sheet according to claim 2, wherein the liquid-absorbing resin layer is formed over a substrate.

7. The liquid absorbing sheet according to claim 3, wherein the liquid-absorbing resin layer is formed over a substrate.

8. The liquid absorbing sheet according to claim 1, wherein the nonaqueous electrolyte solution contains carbonates.

9. The liquid absorbing sheet according to claim 1, wherein in the monofunctional monomer composition (A), the amount of the amide bond-containing acrylic cycle is in the range of 20 to 70 parts by weight with respect to 100 parts by weight of the polyethylene glycol acrylic monomer.

10. The liquid absorbing sheet according to claim 1, wherein the polyfunctional monomer composition (B) is added to the monomer composition in an amount to give a crosslink density of about 0.0001 to 0.17.