Battery cell having hole

Patent metadata

Field	Value
Publication number	US-2017047559-A1
Application number	US-201515118558-A
Country	US
Kind code	A1
Filing date	Jan 30, 2015
Priority date	Feb 24, 2014
Publication date	Feb 16, 2017
Grant date	—

Abstract

Disclosed herein is a battery cell configured to have a structure in which a stacked structure 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 of a battery case, one or more holes are formed from the battery case to the positive electrode or the negative electrode of the electrode assembly, and a transparent window is formed in a portion of the battery case corresponding to the holes.

First claim

1 . A battery cell configured to have a structure in which
a stacked structure comprising a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode is mounted in a receiving part of a battery case, one or more holes are formed from the battery case to the positive electrode or the negative electrode of the electrode assembly, and a transparent window is formed in a portion of the battery case corresponding to the holes.

2 . The battery cell according to claim 1 , wherein the battery case is a pouch type case made of a laminate sheet comprising a resin layer and a metal layer.

3 . The battery cell according to claim 1 , wherein the electrode assembly is a jelly-roll type electrode assembly configured to have a structure in which a positive electrode sheet and a negative electrode sheet are wound in a state in which a separation sheet is interposed between the positive electrode sheet and the negative electrode sheet, a stacked type electrode assembly configured to have a structure in which one or more positive electrode plates and one or more negative electrode plates are stacked in a state in which one or more separators are disposed respectively between the positive electrode plates and the negative electrode plates, or a stacked/folded type electrode assembly configured to have a structure in which stacked type unit cells, each having a positive electrode plate and a negative electrode plate, are folded while being placed on a separation sheet.

4 . The battery cell according to claim 1 , wherein the electrode assembly is configured to have a structure in which, when viewed in vertical section, electrode A, which is a positive electrode or a negative electrode, and electrode B, which is an electrode having a polarity opposite to the polarity of electrode A, are alternately stacked in a state in which a separator is interposed between electrode A and electrode B to constitute at least one pair of electrodes, and outermost electrodes in the stacked structure are electrode A and electrode B or electrodes A.

5 . The battery cell according to claim 4 , wherein, assuming that, from one side of the battery case at which the window is located, a first electrode of the electrode assembly is electrode A 1 , a second electrode of the electrode assembly is electrode B 2 , a (k−1)-th electrode of the electrode assembly is electrode A (k−1) , and a k-th electrode of the electrode assembly is electrode B k (where k is a natural number equal to or greater than 4), holes are formed from the first electrode to the (k−1)-th electrode so as to observe the k-th electrode.

6 . The battery cell according to claim 4 , wherein, assuming that, from one side of the battery case at which the window is located, a first electrode of the electrode assembly is electrode A 1 , a second electrode of the electrode assembly is electrode B 2 , a (k−1)-th electrode of the electrode assembly is electrode A (k−1) , and a k-th electrode of the electrode assembly is electrode B k (where k is a natural number equal to or greater than 4), holes are formed from the first electrode to a (k−2)-th electrode so as to observe the (k−1)-th electrode.

7 . The battery cell according to claim 1 , wherein two or more holes and windows are formed in the electrode assembly and the battery case.

8 . The battery cell according to claim 7 , wherein the two or more holes and windows are formed in different portions.

9 . The battery cell according to claim 7 , wherein the two or more holes are formed so as to be observed from one side of the battery case, the opposite side of the battery case, or the opposite sides of the battery case.

10 . The battery cell according to claim 1 , wherein each of the holes has an area equivalent to 1 to 15% an entire area of one surface of the battery cell when viewed in plan.

11 . The battery cell according to claim 1 , wherein a hole formed in the separator has an area less than an area of a hole formed in one of the electrodes.

12 . The battery cell according to claim 11 , wherein the area of the hole formed in the separator is 60 to 90% the area of the hole formed in one of the electrodes.

13 . The battery cell according to claim 1 , wherein the battery case is provided at a portion thereof corresponding to the holes of the electrode assembly with an opening, and a transparent member is attached to the opening to constitute a window.

14 . The battery cell according to claim 1 , wherein the transparent member is attached to the opening using an adhesive or an adhesive tape.

15 . The battery cell according to claim 14 , wherein the adhesive is at least one selected from a group consisting of an epoxy adhesive, a ceramic adhesive, and an acrylic adhesive.

16 . The battery cell according to claim 14 , wherein the adhesive tape is at least one selected from a group consisting of a polyimide tape, a polyester tape, and a polyethylene tape.

17 . The battery cell according to claim 1 , wherein the transparent member is a polymer film and is at least one selected from a group consisting of a polypropylene film and a cycloolefin-based film.

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

Assignees

• Lg Chemical Ltd

Inventors

• Yoo Jung Woo
• Kim Je Young
• Chung Geun Chang

Classifications

• H01M10/0463 Primary

  Cells or batteries with horizontal or inclined electrodes · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M10/0587

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

• H01M10/0585

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

• H01M10/0525

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