# US 10,319,953 B2 · Battery cell having hole > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,319,953 B2 - Document ID: US10319953B2 - Status: Granted - Kind: B2 - Application number: 15/118,558 - Filed: 2015-01-30 - Published: 2017-02-16 - Granted: 2019-06-11 - Earliest claimed: 2014-02-24 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Jung Woo Yoo; Je Young Kim; Geun Chang Chung - Web page: https://patentgrep.com/patent/US10319953B2 ## CPC - H01M 10/0463: {Cells or batteries with horizontal or inclined electrodes} - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 10/0587: of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators - H01M 50/105: Pouches or flexible bags - H01M 50/119: Metals - H01M 50/121: Organic material - H01M 50/124: having a layered structure - H01M 50/133: Thickness - H01M 50/147: Lids or covers - H01M 50/186: characterised by the disposition of the sealing members - H01M 50/198: characterised by physical properties, e.g. adhesiveness or hardness - H01M 10/052: Li-accumulators - H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators - H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## 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. ## Claims ### Claim 1 A battery cell configured to have a structure in which an electrode assembly of a stacked structure comprising a repeating pattern of 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 in the battery case opposite to an outermost positive electrode or an outermost negative electrode of the electrode assembly, and a transparent window is formed in a portion of the battery case corresponding to the one or more holes so as to cover the one or more holes, wherein at least one of the positive electrodes or the negative electrodes in the stacked structure includes a through hole aligned with the one or more holes formed in the battery case, and wherein at least one of the positive electrodes or the negative electrodes in the stacked structure does not include the through hole aligned with one or more of the holes formed in the battery case. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 1) The battery cell according to claim 1, wherein the electrode assembly is 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. ### Claim 4 (depends on 1) 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 the positive electrode or the 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 the 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. ### Claim 5 (depends on 4) 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 A1, a second electrode of the electrode assembly is electrode B2, 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 Bk (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. ### Claim 6 (depends on 4) 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 A1, a second electrode of the electrode assembly is electrode B2, 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 Bk (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. ### Claim 7 (depends on 1) The battery cell according to claim 1, wherein two or more holes and windows are formed in the electrode assembly and the battery case. ### Claim 8 (depends on 7) The battery cell according to claim 7, wherein the two or more holes and windows are formed in different portions. ### Claim 9 (depends on 7) The battery cell according to claim 7, wherein the two or more holes are formed at opposing surfaces of the battery case. ### Claim 10 (depends on 1) The battery cell according to claim 1, wherein each of the one or more holes has an area equivalent to 1 to 15% an entire area of one surface of the battery cell when viewed in plan. ### Claim 11 (depends on 1) The battery cell according to claim 1, wherein a through hole formed in the separator has an area less than an area of the through hole formed in the at least one of the positive electrodes or the negative electrodes. ### Claim 12 (depends on 11) The battery cell according to claim 11, wherein the area of the through hole formed in the separator is 60 to 90% the area of the through hole formed in the at least one of the positive electrodes or the negative electrodes. ### Claim 13 (depends on 1) 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. ### Claim 14 (depends on 1) The battery cell according to claim 1, wherein the transparent member is attached to the opening using an adhesive or an adhesive tape. ### Claim 15 (depends on 14) 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. ### Claim 16 (depends on 14) 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. ### Claim 17 (depends on 1) The battery cell according to claim 1, wherein the transparent member includes a cycloolefin-based film. ### Claim 18 (depends on 1) The battery cell according to claim 1, wherein the battery cell is a lithium secondary battery. ### Claim 19 (depends on 1) The battery cell according to claim 1, wherein communication is achieved from the battery case to the positive electrode or the negative electrode to be observed. ### Claim 20 A battery cell configured to have a structure in which an electrode assembly is mounted in a receiving part of a battery case, 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 to form repeatedly rolled layers of a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode, one or more holes are formed in the battery case opposite to an outermost positive electrode or an outermost negative electrode of the electrode assembly, and a transparent window is formed in a portion of the battery case corresponding to the one or more holes so as to cover the one or more holes, wherein at least one of the rolled layers of the positive electrode or the negative electrode includes a through hole aligned with the one or more holes formed in the battery case, and wherein at least one of the rolled layers of the positive electrode or the negative electrode does not include the through hole aligned with one or more of the holes formed in the battery case.