Method of forming a package

Patent metadata

Field	Value
Publication number	US-10468640-B2
Application number	US-201715858197-A
Country	US
Kind code	B2
Filing date	Dec 29, 2017
Priority date	Dec 10, 2004
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A method of forming a package is provided and includes providing two laminate edge portions of the package, each of which includes a foil layer between first and second resin layers; and welding together the respective first resin layers at a first position spaced apart from the edges while not welding the respective first resin layers at the edges, wherein the edge portions include edges from which electrode terminals extend such that portions of the electrode terminals are exposed beyond the edges, and wherein the edge portions are between a sealing portion and exposed portions of positive and negative electrode terminals.

First claim

What is claimed is:

1. A method of forming a package, comprising:
providing two laminate edge portions of the package, each of which includes a foil layer between first and second resin layers such that the respective first resin layers face each other and the respective second resin layers face away from each other; and
welding together the respective first resin layers at a first position spaced apart from the edges while not welding the respective first resin layers at the edges such that, given a thickness of each laminate edge portion before being subjected to heat and compression is represented by t, a thickness of laminate portions at the first position is represented by t 1 , and a thickness of laminate portions at the edges thereof is represented by t 2 , then, t 1 <2t<t 2 ,
wherein the edge portions include edges from which electrode terminals extend such that portions of the electrode terminals are exposed beyond the edges, and
wherein the edge portions are between a sealing portion and exposed portions of positive and negative electrode terminals.

2. The method of claim 1 , wherein the welding is ultrasonic welding.

3. The method of claim 1 , wherein the welding uses an application of heat and compression.

4. The method of claim 3 , wherein the application of heat comprises using a heater head with notches in a surface thereof to accommodate electrodes of a battery cell.

5. The method of claim 1 , further comprising:
enclosing a battery cell in the package prior to subjecting the laminate edge portions of the package to welding.

6. The method of claim 1 , wherein during welding, portions of the respective first resin layers flow toward the edges such that t 2 is greater than or equal to 2t.

7. The method of claim 1 , wherein the respective first resin layers include cast polypropylene.

8. The method of claim 1 , wherein the foil layer includes aluminum, the respective first resin layers include cast polypropylene, and the respective second resin layers include nylon or poly(ethylene terephthalate).

9. The method of claim 1 , wherein a relationship in which 2t−2p+5<t 1 <2t−5 in unit of micrometer is satisfied, and wherein p represents a thickness of each first resin layer prior to welding.

Assignees

• Murata Manufacturing Co

Inventors

• Hatta Kazuhito
• Shibuya Mashio

Classifications

• B29C65/18

  using heated tools · CPC title

• B29C66/71

  characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125) · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B2274/00

  Thermoplastic elastomer material · CPC title

• B29C65/02

  by heating, with or without pressure · CPC title