Pouch type secondary battery and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-10079373-B2
Application number	US-201414477523-A
Country	US
Kind code	B2
Filing date	Sep 4, 2014
Priority date	May 21, 2013
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

A pouch type secondary battery and a method of manufacturing the same are disclosed. The pouch type secondary battery includes a pouch type case formed by attaching an upper sheet and a lower sheet, and an electrode assembly received in the pouch type case. A polymer coating layer for improving sealability is further included at an outer side portion of the pouch type case, in which the upper sheet and the lower sheet are attached.

First claim

What is claimed is:

1. A pouch type secondary battery, comprising:
a pouch type case formed by attaching an upper sheet and a lower sheet; and
an electrode assembly received in the pouch type case,
wherein each of the upper sheet and the lower sheet includes an inner layer, a metal layer, and an outer layer,
wherein a polymer coating layer for improving sealability is directly formed on only an entire outermost surface of the metal layer of the pouch type case that extends perpendicular to the inner layer and the outer layer, in which the upper sheet and the lower sheet are attached.

2. The pouch type secondary battery of claim 1 , wherein the polymer is a UV curable polymer or a thermosetting polymer.

3. The pouch type secondary battery of claim 2 , wherein the UV curable polymer includes at least one selected from the group consisting of an organic isocyanate compound having two or more isocyanate groups and a hydroxyalkyl (meth)acrylate resin modified with a polylactone-based compound.

4. The pouch type secondary battery of claim 2 , wherein the thermosetting polymer includes at least one selected from the group consisting of epoxyalkyl (meth)acrylate, allyl glycidyl ether, allyl glycidyl ester, aryl glycidyl ether, aryl glycidyl ester, glycidyl 5-norbornene-2-methyl-2-carboxylate (a mixture of endo- and exo-compounds), 1,2-epoxy-5-hexene, 1,2-epoxy-9-decene, glycidyl (meth)acrylate, glycidyl α-ethyl (meth)acrylate, glycidyl α-n-propyl (meth)acrylate, glycidyl α-n-butyl (meth)acrylate, methylglycidyl (meth)acrylate, 3,4-epoxybutyl (meth)acrylate, 4,5-epoxypentyl (meth)acrylate, 5,6-epoxyheptyl (meth)acrylate, and 6,7-epoxyheptyl α-ethylacrylate.

5. The pouch type secondary battery of claim 1 , wherein the polymer coating layer is formed on an outer side portion perpendicular to an extruded surface of an electrode terminal of the electrode assembly.

6. The pouch type secondary battery of claim 1 , wherein the polymer coating layer is formed on an outer side portion horizontal to an extruded surface of an electrode terminal of the electrode assembly.

7. A method of manufacturing a pouch type secondary battery according to claim 1 , comprising:
preparing a pouch type case provided with a receiving part for receiving an electrode assembly and a gas collecting part connected to the receiving part for collecting gas generated in the receiving part;
receiving the electrode assembly in the pouch type case;
sealing an outer part of the pouch type case by heat welding;
injecting an electrolyte in the pouch type case;
activating a secondary battery and collecting gas generated during activating through the gas collecting part;
heat welding a boundary of the receiving part and the gas collecting part;
cutting and removing the gas collecting part; and
forming a polymer coating layer on an outer side portion of the pouch type case receiving the electrode assembly.

8. The method of manufacturing a pouch type secondary battery of claim 7 , wherein the forming of the polymer coating layer is performed by a contact type coating method.

9. The method of manufacturing a pouch type secondary battery of claim 8 , wherein the contact type coating method is performed by using a sponge coating head or a roller coating head.

10. A pouch type secondary battery, comprising:
a pouch type case formed by attaching an upper sheet and a lower sheet, each of the upper sheet and the lower sheet having an inner layer, a metal layer above the inner layer, and an outer layer above the metal layer; and
an electrode assembly received in the pouch type case, the inner layers being adjacent electrode assembly,
wherein a polymer coating layer for improving sealability is directly formed on only an entire outermost surface of the metal layer of the pouch type case that extends perpendicular to the inner layer and the outer layer, in which the upper sheet and the lower sheet are attached.

11. The pouch type secondary battery of claim 10 , wherein the polymer is a UV curable polymer or a thermosetting polymer.

12. The pouch type secondary battery of claim 11 , wherein the UV curable polymer includes at least one selected from the group consisting of an organic isocyanate compound having two or more isocyanate groups and a hydroxyalkyl (meth)acrylate resin modified with a polylactone-based compound.

13. The pouch type secondary battery of claim 11 , wherein the thermosetting polymer includes at least one selected from the group consisting of epoxyalkyl (meth)acrylate, allyl glycidyl ether, allyl glycidyl ester, aryl glycidyl ether, aryl glycidyl ester, glycidyl 5-norbornene-2-methyl-2-carboxylate (a mixture of endo- and exo-compounds), 1,2-epoxy-5-hexene, 1,2-epoxy-9-decene, glycidyl (meth)acrylate, glycidyl α-ethyl (meth)acrylate, glycidyl α-n-propyl (meth)acrylate, glycidyl α-n-butyl (meth)acrylate, methylglycidyl (meth)acrylate, 3,4-epoxybutyl (meth)acrylate, 4,5-epoxypentyl (meth)acrylate, 5,6-epoxyheptyl (meth)acrylate, and 6,7-epoxyheptyl α-ethylacrylate.

14. The pouch type secondary battery of claim 10 , wherein the polymer coating layer is formed on an outer side portion perpendicular to an extruded surface of an electrode terminal of the electrode assembly.

15. The pouch type secondary battery of claim 10 , wherein the polymer coating layer is formed on an outer side portion horizontal to an extruded surface of an electrode terminal of the electrode assembly.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Jeoung Hwan
• Lee Shin Hwa
• Lee Woo Yong
• Kim Min Su
• Lee Hyang Mok

Classifications

• H01M10/0436 Primary

  Small-sized flat cells or batteries for portable equipment · CPC title

• Y10T29/4911

  including sealing · CPC title

• H01M2/0287

  Electricity · mapped topic

• H01M2/0292

  Electricity · mapped topic

• H01M2/0217

  Electricity · mapped topic