# US 2019/0379032 A1 · Pouch type secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0379032 A1 - Document ID: US20190379032A1 - Status: Published application - Kind: A1 - Application number: 16/481,273 - Filed: 2018-08-09 - Published: 2019-12-12 - Earliest claimed: 2017-08-29 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Jong Pil PARK; Seung Don CHOI - Web page: https://patentgrep.com/patent/US20190379032A1 ## CPC - H01M 10/647: Prismatic or flat cells, e.g. pouch cells - H01M 50/531: Electrode connections inside a battery casing - H01M 50/105: Pouches or flexible bags - H01M 50/124: having a layered structure - H01M 50/178: for pouch or flexible bag cells - H01M 50/578: in response to pressure - H01M 50/586: inside the batteries, e.g. incorrect connections of electrodes - H01M 50/595: Tapes - H01M 2200/20: Pressure-sensitive devices - Y02E 60/10: Energy storage using batteries - 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 ## Abstract A pouch type secondary battery includes: an electrode assembly having an electrode including a positive electrode and a negative electrode and a separator laminated therein; a battery case having a pouch shape to accommodate the electrode assembly; an electrode tab connected to the electrode and protruding from one side of the electrode; a first electrode lead having one end connected to the electrode tab; a second electrode lead having one end connected to the other end of the first electrode lead and the other end protruding to outside the battery case; and a connection part bonding the first electrode lead to the second electrode lead to connect the first and second electrode leads to each other, wherein a first inclined surface is provided on at least one of the other end of the first electrode lead and the one end of the second electrode lead. ## Claims ### Claim 1 A pouch type secondary battery, comprising: an electrode assembly having an electrode comprising a positive electrode and a negative electrode and a separator laminated therein; a battery case having a pouch shape to accommodate the electrode assembly; an electrode tab connected to the electrode and protruding from one side of the electrode; a first electrode lead having one end connected to the electrode tab; a second electrode lead having one end connected to the other end of the first electrode lead and the other end protruding to an outside of the battery case; and a connection part bonding the first electrode lead to the second electrode lead to connect the first and second electrode leads to each other, wherein a first inclined surface is provided on at least one of the other end of the first electrode lead and the one end of the second electrode lead. ### Claim 2 (depends on 1) The pouch type secondary battery of claim 1, further comprising a step compensation part disposed on a side of the other end of the first electrode lead. ### Claim 3 (depends on 2) The pouch type secondary battery of claim 2, wherein the step compensation part includes a plurality of step compensation parts. ### Claim 4 (depends on 3) The pouch type secondary battery of claim 3, wherein the first inclined surface is provided on the other end of the first electrode lead, and each of the plurality of step compensation parts has one end contacting the first inclined surface in a state in which the plurality of step compensation parts are laminated, and wherein the plurality of step compensation parts increase in length in order of the lamination to correspond to an inclined angle of the first inclined surface. ### Claim 5 (depends on 2) The pouch type secondary battery of claim 2, wherein the step compensation part is integrally provided. ### Claim 6 (depends on 2) The pouch type secondary battery of claim 2, wherein the first inclined surface is provided on the other end of the first electrode lead, and a second inclined surface is provided on one end of the step compensation part. ### Claim 7 (depends on 6) The pouch type secondary battery of claim 6, wherein the second inclined surface corresponds to an inclined angle of the first inclined surface. ### Claim 8 (depends on 6) The pouch type secondary battery of claim 6, wherein the second inclined surface contacts the first inclined surface. ### Claim 9 (depends on 2) The pouch type secondary battery of claim 2, wherein the step compensation part is non-conductive. ### Claim 10 (depends on 2) The pouch type secondary battery of claim 2, wherein the step compensation part has a thickness corresponding to the sum of a thickness of the first electrode lead and a thickness of the connection part. ### Claim 11 (depends on 1) The pouch type secondary battery of claim 1, wherein the first inclined surface has an obtuse angle with respect to a bonding surface on which the first electrode lead and the second electrode lead are bonded to each other through the connection part. ### Claim 12 (depends on 1) The pouch type secondary battery of claim 1, further comprising an insulation part surrounding a portion of each of the first and second electrode leads to allow the first and second electrode leads to be bonded to the battery case. ### Claim 13 (depends on 12) The pouch type secondary battery of claim 12, wherein a bonding force between each of the first and second electrode leads and the connection part is less than that between each of the first and second electrode leads and the insulation part. ### Claim 14 (depends on 12) The pouch type secondary battery of claim 12, wherein the insulation part surrounds a portion at which the first and second electrode leads are connected to each other through the connection part. ### Claim 15 (depends on 12) The pouch type secondary battery of claim 12, wherein the insulation part includes at least one of a thermoplastic resin, a thermosetting resin, and a photocurable resin. ### Claim 16 (depends on 1) The pouch type secondary battery of claim 1, wherein the connection part includes a conductive polymer comprising a conductive material. ### Claim 17 (depends on 1) The pouch type secondary battery of claim 1, wherein the connection part has a thickness of 1 μm to 500 μm. ### Claim 18 A pouch type secondary battery, comprising: a battery case having a pouch shape; a first electrode lead having a first end within the battery case; and a second electrode lead having a first end electrically connected to a second end of the first electrode lead and a second end extending outside of the battery case, wherein a first inclined surface is provided on at least one of the second end of the first electrode lead and the first end of the second electrode lead. ### Claim 19 (depends on 18) The pouch type secondary battery of claim 18, wherein the battery case includes a first insulating layer and a second insulating layer configured to seal the battery case around the first and second electrode leads, wherein the first insulating layer is bonded to the first electrode lead at a location adjacent to the electrical connection between the first and second electrode leads, and wherein the second insulating layer is bonded to the second electrode lead at a location adjacent to the electrical connection between the first and second electrode leads. ### Claim 20 (depends on 17) The pouch type secondary battery of claim 17, wherein a bonding force between the first electrode lead and the first insulating layer and a bonding force between the second electrode lead and the second insulating layer are each stronger than a bonding force of the electrical connection between the first and second electrode leads.