Battery cell having means for preventing short-circuit

Patent metadata

Field	Value
Publication number	US-10553835-B2
Application number	US-201415033438-A
Country	US
Kind code	B2
Filing date	Oct 22, 2014
Priority date	Nov 26, 2013
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

Disclosed herein is a battery cell configured such that an electrode assembly, including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, is mounted in a receiving part formed in a battery case, a positive electrode terminal and a negative electrode terminal protrude from at least one side of the electrode assembly, and an insulative material is provided between the electrode assembly and the battery case.

First claim

The invention claimed is:

1. A battery cell comprising:
an electrode assembly including at least one positive electrode, at least one negative electrode, and a separator respectively interposed between each positive electrode and each negative electrode;
a battery case having a receiving part between a first portion of the battery case and a second portion of the battery case, the battery case being a pouch-shaped case made of a laminate sheet comprising a resin layer and a metal layer;
a first insulative material wound on an outer surface of the electrode assembly; and
a second insulative material provided on an inner surface of the battery case, wherein the outer surface of the electrode assembly faces the inner surface of the battery case,
wherein a positive electrode terminal and a negative electrode terminal of the electrode assembly protrude from at least one side of the electrode assembly,
wherein the first and second insulative materials are configured to stretch into a shape surrounding an object when the object has penetrated the first portion of the battery case, the at least one positive electrode, the separator and the at least one negative electrode to prevent the occurrence of internal short-circuits due to direct contact between the object and any of the at least one positive electrode and the at least one negative electrode,
wherein the first and second insulative materials are provided directly between a positive electrode of the at least one positive electrode and the first portion of the battery case and are provided directly between a negative electrode of the at least one negative electrode and the second portion of the battery case,
wherein the first insulative material is an insulative tape that covers an upper surface, a lower surface and opposite side surfaces of the electrode assembly,
wherein the positive electrode terminal and the negative electrode terminal of the electrode assembly are provided without the first and second insulative materials,
wherein at least the first insulative material is provided over 30 to 90% of an entire area of the outer surface of the electrode assembly,
wherein the first and second insulative materials are made of polytetrafluoroethylene (PTFE), and
wherein the first and second insulative materials have a thickness equivalent to 5 to 10% of a thickness of the electrode assembly.

2. The battery cell according to claim 1 , wherein the electrode assembly is configured to have a structure in which the at least one positive electrode and the at least one negative electrode are wound in a state in which the separator is interposed between the at least one positive electrode and the at least one negative electrode.

3. The battery cell according to claim 1 , wherein the at least one positive electrode includes a plurality of positive electrodes and the at least one negative electrode includes a plurality of negative electrodes, each having a predetermined size which are sequentially stacked in a state in which separators are disposed respectively between the plurality of positive electrodes and the plurality of negative electrodes.

4. The battery cell according to claim 1 , wherein the at least one positive electrode includes a plurality of positive electrodes and the at least one negative electrode includes a plurality of negative electrodes, each having a predetermined size which are sequentially stacked in a state in which separators are disposed respectively between the plurality of positive electrodes and the plurality of negative electrodes to constitute a unit cell, after which a plurality of unit cells is sequentially folded while being placed on a separation film.

5. The battery cell according to claim 1 , wherein the at least first insulative material is provided over 50 to 70% of the entire area of the outer surface of the electrode assembly.

6. The battery cell according to claim 1 , wherein the battery cell is a lithium secondary battery.

7. A device comprising one or more battery cells according to claim 1 .

8. The device according to claim 7 , wherein the device is any one selected from a group consisting of a cellular phone, a tablet computer, a laptop computer, a power tool, an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, and a power storage apparatus.

Assignees

• Lg Chemical Ltd

Inventors

• Park Chan Ki
• Kim Dong-Myung
• Ryu Sang Baek
• Oh Jung Shik

Classifications

• H01M10/0587 Primary

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M2200/00

  Safety devices for primary or secondary batteries · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2/028 Primary

  Electricity · mapped topic