Liquid absorbing sheet and nonaqueous electrolyte battery pack

• US 7,510,767 B2
• Filed: 04/01/2004
• Issued: 03/31/2009
• Est. Priority Date: 05/30/2003
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Chemical & Information Device Corporation (Sony Group Corp.), Sony Corporation (Sony Group Corp.)
• Inventors: Moriyama, Hironobu, Hatsuda, Kouki, Fujita, Yasuhiro, Nomura, Mamiko
• Primary Examiner(s): Rickman; Holly
• Assistant Examiner(s): Harris; Gary D
• Application Number:
  US10/553,705
• Publication Number:
  US 20060172199A1
• Time in Patent Office: 1,825 Days
• Field of Search: 428/411, 428/411.1
• US Class Current: 428/411.1
• 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 nonaqueous electrolyte battery pack comprising

a nonaqueous electrolyte battery cell,

a circuit board,

a nonaqueous electrolyte-absorbing element for absorbing a nonaqueous electrolyte solution in the event of electrolyte leakage from the nonaqueous electrolyte battery cell, and

a battery case encasing the battery cell, the circuit board and the nonaqueous electrolyte-absorbing element, wherein the nonaqueous electrolyte-absorbing element is formed of 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. A nonaqueous electrolyte battery pack comprising

a nonaqueous electrolyte battery cell,

a circuit board,

a nonaqueous electrolyte-absorbing element for absorbing a nonaqueous electrolyte solution in the event of electrolyte leakage from the nonaqueous electrolyte battery cell, and

a battery case encasing the battery cell, the circuit board and the nonaqueous electrolyte-absorbing element, wherein the nonaqueous electrolyte-absorbing element is formed of 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), wherein the polyethylene glycol acrylate monomer is phenoxypolyethylene glycol acrylate or methoxypolyethylene glycol acrylate.

3. A nonaqucous electrolyte battery pack comprising

a nonaqueous electrolyte battery cell,

a circuit board,

a nonaqueous electrolyte-absorbing element for absorbing a nonaqueous electrolyte solution in the event of electrolyte leakage from the nonaqueous electrolyte battery cell, and

a battery case encasing the battery cell, the circuit board and the nonaqueous electrolyte-absorbing element, wherein the nonaqueous electrolyte-absorbing element is formed of 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), wherein the amide bond-containing acrylic monomer is acryloylmorpholine or N,N-diethylacrylamide.

4. A nonaqueous electrolyte battery pack comprising

a nonaqueous electrolyte battery cell,

a circuit board,

a nonaqueous electrolyte-absorbing element for absorbing a nonaqueous electrolyte solution in the event of electrolyte leakage from the nonaqueous electrolyte battery cell, and

a battery case encasing the battery cell, the circuit board and the nonaqueous electrolyte-absorbing element, wherein the nonaqueous electrolyte-absorbing element is formed of 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), wherein the liquid-absorbing resin layer is formed over a substrate.

5. A nonaqueous electrolyte battery pack comprising

a nonaqueous electrolyte battery cell,

a circuit board,

a nonaqueous electrolyte-absorbing element for absorbing a nonaqueous electrolyte solution in the event of electrolyte leakage from the nonaqueous electrolyte battery cell, and

a battery case encasing the battery cell, the circuit board and the nonaqueous electrolyte-absorbing element, wherein the nonaqueous electrolyte-absorbing element is formed of 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), wherein the liquid-absorbing resin layer is formed over a substrate and the substrate is capable of absorbing and retaining a nonaqueous electrolyte solution.