# US 9,437,846 B2 · Secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,437,846 B2 - Document ID: US9437846B2 - Status: Granted - Kind: B2 - Application number: 13/869,877 - Filed: 2013-04-24 - Published: 2014-07-31 - Granted: 2016-09-06 - Earliest claimed: 2013-01-28 - Assignees: Samsung SDI Co., Ltd.; Robert Bosch GmbH - Applicants: Samsung SDI Co., Ltd.; Robert Bosch GmbH - Inventors: Duk-Jung Kim - Web page: https://patentgrep.com/patent/US9437846B2 ## CPC - H01M 50/528: Fixed electrical connections, i.e. not intended for disconnection - H01M 50/176: for prismatic or rectangular cells (H01M50/181 takes precedence) - H01M 50/188: the sealing members being arranged between the lid and terminal - H01M 50/55: on the same side of the cell - H01M 50/553: Terminals adapted for prismatic, pouch or rectangular cells - H01M 50/562: characterised by the material - H01M 50/566: by welding, soldering or brazing - H01M 50/533: characterised by the shape of the leads or tabs - H01M 50/534: characterised by the material of the leads or tabs - H01M 50/538: Connection of several leads or tabs of wound or folded electrode stacks - 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 Provided is a secondary battery including: an electrode assembly; a case housing the electrode assembly and having a case opening; a cap plate substantially sealing the case opening; a first terminal plate on the cap plate; a first collector terminal coupling the electrode assembly to the first terminal plate; and a seal gasket between the first collector terminal and the cap plate, wherein the first collector terminal includes: a lower terminal adjacent the electrode assembly, and an upper terminal adjacent the first terminal plate, the upper terminal including a first metal different from a second metal of the lower terminal, and contacting the lower terminal at an interface between the first metal and the second metal, and wherein the seal gasket covers at least a portion of a side surface of the interface between the first metal and the second metal. ## Claims ### Claim 1 A secondary battery comprising: an electrode assembly; a case housing the electrode assembly and having a case opening; a cap plate substantially sealing the case opening; a first terminal plate on the cap plate; a first collector terminal coupling the electrode assembly to the first terminal plate; a seal gasket between the first collector terminal and the cap plate; and an insulating member between the first terminal plate and the cap plate, wherein the seal gasket extends between the insulating member and a protruding portion of the first terminal plate along a direction perpendicular to a top surface of the cap plate, and wherein the first collector terminal comprises: a lower terminal adjacent the electrode assembly, and an upper terminal adjacent the first terminal plate, the upper terminal comprising a first metal different from a second metal of the lower terminal, and contacting the lower terminal at an interface between the first metal and the second metal, and wherein the seal gasket covers at least a portion of a side surface of the interface between the first metal and the second metal. ### Claim 2 (depends on 1) The secondary battery of claim 1, wherein the first collector terminal extends at least partially through a terminal hole of the cap plate, and the seal gasket is along a side surface of the terminal hole. ### Claim 3 (depends on 1) The secondary battery of claim 1, wherein the first terminal plate comprises the protruding portion protruding toward the seal gasket and around a terminal hole of the first terminal plate. ### Claim 4 (depends on 3) The secondary battery of claim 3, wherein the protruding portion is continuous along a periphery of the terminal hole. ### Claim 5 (depends on 1) The secondary battery of claim 1, wherein the seal gasket contacts the first terminal plate and comprises a flange-shaped upper portion. ### Claim 6 A secondary battery comprising: an electrode assembly; a case housing the electrode assembly and having a case opening; a cap plate substantially sealing the case opening; a first terminal plate on the cap plate; a first collector terminal coupling the electrode assembly to the first terminal plate; a seal gasket between the first collector terminal and the cap plate; and an insulating member between the first terminal plate and the cap plate, wherein the seal gasket extends between the insulating member and a protruding portion of the first terminal plate, and wherein the first collector terminal comprises: a lower terminal adjacent the electrode assembly, and an upper terminal adjacent the first terminal plate, the upper terminal comprising a first metal different from a second metal of the lower terminal, and contacting the lower terminal at an interface between the first metal and the second metal, and wherein the seal gasket covers at least a portion of a side surface of the interface between the first metal and the second metal, wherein the seal gasket contacts the first terminal plate and comprises a flange-shaped upper portion, and wherein at least a portion of an upper portion of the seal gasket is compressed between the first terminal plate and the insulating member. ### Claim 7 (depends on 5) The secondary battery of claim 5, wherein a width of the upper portion of the seal gasket is larger than a width of a portion of the seal gasket in a terminal hole of the cap plate. ### Claim 8 (depends on 1) The secondary battery of claim 1, wherein the seal gasket extends along a length direction of the first collector terminal and covers at least the interface between the first metal and the second metal. ### Claim 9 (depends on 8) The secondary battery of claim 8, wherein at least a portion of an upper portion of the seal gasket is vertically offset above the interface between the first metal and the second metal. ### Claim 10 (depends on 1) The secondary battery of claim 1, wherein the upper terminal is compressed and fixed with respect to a top surface of the first terminal plate, and the lower terminal is coupled to a first collector member that is electrically coupled to the electrode assembly. ### Claim 11 (depends on 10) The secondary battery of claim 10, wherein a top of the upper terminal has a flange shape for engaging the first terminal plate. ### Claim 12 (depends on 10) The secondary battery of claim 10, wherein the lower terminal comprises a stopper having a width greater than a terminal hole of the cap plate, and wherein the first collector terminal extends through the terminal hole. ### Claim 13 (depends on 10) The secondary battery of claim 10, wherein the first terminal plate comprises a metal substantially similar to the first metal, and the first collector member comprises a metal substantially similar to the second metal. ### Claim 14 (depends on 1) The secondary battery of claim 1, further comprising a second collector terminal having a polarity different from a polarity of the first collector terminal. ### Claim 15 (depends on 14) The secondary battery of claim 14, wherein the second collector terminal extends through the cap plate to electrically couple the electrode assembly to a second terminal plate, and the second collector terminal further comprises a lower terminal adjacent the electrode assembly and an upper terminal adjacent the second terminal plate. ### Claim 16 (depends on 15) The secondary battery of claim 15, wherein the lower terminal and the upper terminal of the second collector terminal comprise a same metal or substantially similar metals. ### Claim 17 (depends on 15) The secondary battery of claim 15, wherein the upper terminal of the second collector terminal is compressed and fixed with respect to a top surface of the second terminal plate, and the lower terminal of the second collector terminal is coupled to a second collector member that is electrically coupled to the electrode assembly. ### Claim 18 (depends on 17) The secondary battery of claim 17, wherein the upper terminal and the lower terminal of the second collector terminal comprise a same metal or substantially similar metals as the second terminal plate and the second collector member.