# US 2026/0074331 A1 · Secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0074331 A1 - Document ID: US20260074331A1 - Status: Published application - Kind: A1 - Application number: 19/182,821 - Filed: 2025-04-18 - Published: 2026-03-12 - Earliest claimed: 2024-09-06 - Assignees: Samsung SDI Co., Ltd. - Applicants: Samsung SDI Co., Ltd. - Inventors: Dong Bok YANG - Web page: https://patentgrep.com/patent/US20260074331A1 ## CPC - H01M 50/184: characterised by their shape or structure - H01M 50/105: Pouches or flexible bags - H01M 50/186: characterised by the disposition of the sealing members - H01M 50/193: Organic material - H01M 50/538: Connection of several leads or tabs of wound or folded electrode stacks - B60L 50/64: Constructional details of batteries specially adapted for electric vehicles - H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A secondary battery includes a case including an accommodation part and a cap part, the accommodation part and the cap part being bonded by a sealing layer that includes a first sealing layer and a second sealing layer, and a melting temperature of the second sealing layer being lower than a melting temperature of the first sealing layer, an electrode assembly accommodated in the accommodation part, a plurality of electrode tabs connected to the electrode assembly, and a plurality of leads connected to the electrode tabs. ## Claims ### Claim 1 A secondary battery, comprising: a case comprising an accommodation part and a cap part, the accommodation part and the cap part being bonded by a sealing layer on a sealing part, the sealing layer comprising a first sealing layer and a second sealing layer, and a melting temperature of the second sealing layer being lower than a melting temperature of the first sealing layer; an electrode assembly accommodated in the accommodation part; a plurality of electrode tabs connected to the electrode assembly; and a plurality of leads connected to the plurality of electrode tabs. ### Claim 2 (depends on 1) The secondary battery as claimed in claim 1, wherein: the sealing part comprises a first sealing part, a second sealing part, and a third sealing part, the plurality of leads are on the first sealing part, and at least one of the second sealing part and the third sealing part comprises the first sealing layer and the second sealing layer. ### Claim 3 (depends on 2) The secondary battery as claimed in claim 2, wherein the case comprises a convex part, the convex part being arranged on a region corresponding to the second sealing layer. ### Claim 4 (depends on 1) The secondary battery as claimed in claim 1, wherein: the sealing part comprises a first sealing part, a second sealing part, and a third sealing part, the plurality of leads are on the first sealing part, and the first sealing part comprises the first sealing layer and the second sealing layer. ### Claim 5 (depends on 4) The secondary battery as claimed in claim 4, wherein the second sealing layer is between the plurality of leads. ### Claim 6 (depends on 4) The secondary battery as claimed in claim 4, wherein the second sealing layer is in an entire region between the plurality of leads. ### Claim 7 (depends on 4) The secondary battery as claimed in claim 4, wherein the second sealing layer is only in a portion of a region between the plurality of leads. ### Claim 8 (depends on 1) The secondary battery as claimed in claim 1, wherein the first sealing layer and the second sealing layer have different physical characteristics. ### Claim 9 (depends on 1) The secondary battery as claimed in claim 1, wherein the second sealing layer comprises a sealing film. ### Claim 10 (depends on 1) The secondary battery as claimed in claim 1, wherein: the melting temperature of the first sealing layer is 130 °C to 140 °C, and the melting temperature of the second sealing layer is 90 °C to 110 °C. ### Claim 11 (depends on 1) The secondary battery as claimed in claim 1, wherein the first sealing layer and the second sealing layer comprise a same material. ### Claim 12 (depends on 1) The secondary battery as claimed in claim 1, wherein the first sealing layer and the second sealing layer comprise different materials. ### Claim 13 A secondary battery, comprising: a case comprising an accommodation part and a cap part bonded by a sealing layer on a sealing region, the sealing layer comprising sealing parts, and at least one of the sealing parts comprising sealing sub-layers having different thicknesses from each other; an electrode assembly accommodated in the accommodation part; a plurality of electrode tabs connected to the electrode assembly; and a plurality of leads connected to the plurality of electrode tabs. ### Claim 14 (depends on 13) The secondary battery as claimed in claim 13, wherein: the at least one of the sealing parts comprises a first sealing part, a second sealing part, and a third sealing part, the plurality of leads are on the first sealing part, and at least one of the second sealing part and the third sealing part comprises the sealing sub-layers. ### Claim 15 (depends on 14) The secondary battery as claimed in claim 14, wherein: the second sealing part comprises a first sealing sub-layer having a first thickness, the third sealing part comprises a second sealing sub-layer having a first portion with the first thickness and a second portion with a second thickness, and the second thickness is smaller than the first thickness. ### Claim 16 A secondary battery, comprising: a case comprising an accommodation part and a cap part bonded by a sealing layer on a sealing region, the sealing layer comprising sealing parts, and at least one of the sealing parts comprising a sealing sub-layer having a width smaller than a width of the sealing region; an electrode assembly accommodated in the accommodation part; a plurality of electrode tabs connected to the electrode assembly; and a plurality of leads connected to the plurality of electrode tabs. ### Claim 17 (depends on 16) The secondary battery as claimed in claim 16, wherein: the sealing parts comprise a first sealing part, a second sealing part, and a third sealing part, the plurality of leads are on the first sealing part, and at least one of the second sealing part and the third sealing part comprises the sealing sub-layer. ### Claim 18 (depends on 17) The secondary battery as claimed in claim 17, wherein the sealing sub-layer comprises a region having a first width and a region having a second width, the second width being smaller than the first width. ### Claim 19 (depends on 18) The secondary battery as claimed in claim 18, wherein a portion of the sealing sub-layer having the second width is in a central region or at an edge region of the sealing region. ### Claim 20 (depends on 16) The secondary battery as claimed in claim 16, wherein: the sealing parts comprise a first sealing part, a second sealing part, and a third sealing part, the plurality of leads are on the first sealing part, at least one of the second sealing part and the third sealing part comprises the sealing sub-layer disposed at an edge region of the sealing region, and the width of the sealing sub-layer is 50% or more of the width of the sealing region.