WO 2023/146069
`
`CLAIMS
`
`PCT/KR2022/01 7044
`
`1.
`
`A secondary battery comprising:
`
`a case that has one side open te form an opening;
`
`an electrode assembly that includes a first electrode plate accommodated in
`
`the case and having a first electrode substrate tab disposed on one side of the case
`
`in the longitudinal direction, a second electrode plate having a second electrode
`
`subsirate tab disposed on the other side in the longitudinal direction of the case, and
`
`a separator interposed between the first electrode plate and the second electrode plate,
`
`and is wound or stacked: and
`
`a cap assembly including a cap plate coupled to the opening of the case, a first
`
`current collecting part and a second current collecting part respectively including a first
`
`current collector and a second current collector disposed in parallel with the upper end
`
`of the lengthwise direction of the electrode assembly and respectively electrically
`
`connected to the first electrode substraie tab and the second electrode substrais tab,
`
`a first terminal part and a second termina! part respectively electrically connected to
`
`the first current collecting part and the second current collecting part, and a plurality of
`
`insulation members coupied to at least one of the cap plate, the first current collector
`
`and the second current collector, and the first terminal part and the second terminal
`
`part,
`
`wherein the first current collecting part further comprises @ sub-plate that
`
`electrically connects the first current collector and the first substrate tab, the second
`
`current collecting part further comprises a sub-plate ihat electrically connects the
`
`second current collector and the second substrate tab, and at least one of the sub-
`
`plates of the first current collecting part and the second current collecting part is
`
`23
`
`
`
`CLAIMS
`
`PCT/KR2022/01 7044
`
`1.
`
`A secondary battery comprising:
`
`a case that has one side open te form an opening;
`
`an electrode assembly that includes a first electrode plate accommodated in
`
`the case and having a first electrode substrate tab disposed on one side of the case
`
`in the longitudinal direction, a second electrode plate having a second electrode
`
`subsirate tab disposed on the other side in the longitudinal direction of the case, and
`
`a separator interposed between the first electrode plate and the second electrode plate,
`
`and is wound or stacked: and
`
`a cap assembly including a cap plate coupled to the opening of the case, a first
`
`current collecting part and a second current collecting part respectively including a first
`
`current collector and a second current collector disposed in parallel with the upper end
`
`of the lengthwise direction of the electrode assembly and respectively electrically
`
`connected to the first electrode substraie tab and the second electrode substrais tab,
`
`a first terminal part and a second termina! part respectively electrically connected to
`
`the first current collecting part and the second current collecting part, and a plurality of
`
`insulation members coupied to at least one of the cap plate, the first current collector
`
`and the second current collector, and the first terminal part and the second terminal
`
`part,
`
`wherein the first current collecting part further comprises @ sub-plate that
`
`electrically connects the first current collector and the first substrate tab, the second
`
`current collecting part further comprises a sub-plate ihat electrically connects the
`
`second current collector and the second substrate tab, and at least one of the sub-
`
`plates of the first current collecting part and the second current collecting part is
`
`23
`
`
`
`WO 2023/146069
`
`PCT/KR2022/01 7044
`
`partially or wholly made of a material having lower resistance than the first current
`
`collector or the second current collector.
`
`2.
`
`The secondary battery as claimed in claim 1, wherein: the first current
`
`collecting part further comprises a connection plate electrically connected to the first
`
`current collector and having one end bent in a direction of the first substrate tab, and
`
`the sub-plate is electrically corinected to the corinection plate and the first substrate
`
`tab: and
`
`the second current collecting part further comprises a connection plate
`
`electrically connected fo the second current collector and having orie end bent ina
`
`direction of the second supstrate tab, and the sub-plate is electrically connected to
`
`the connection plate and the second substrate tab.
`
`3.
`
`The secondary battery as claimed in claim 2, wherein the sub-plate of
`
`the first current collecting part comprises a first connection part electrically connected
`
`ta the connection plate and a second connection part electrically connected to the first
`
`substrate tab, and ihe sub-plate of the second current collecting part comprises a first
`
`connection part electrically connected to the connection plate and a second
`
`connection part electrically connected fo the second substrate tab.
`
`4.
`
`The secondary battery as claimed in claim 3, wherein one end of the
`
`connection plate and the first connection part of the sub-plate is welded to each
`
`other, the second connection part and the first substrate tab of the first current
`
`24
`
`
`
`WO 2023/146069
`
`PCT/KR20 22/03 7044
`
`collecting part is welded fo each other, and the second connection part and the
`
`second substrate fab of the second currant collecting part is welded fo each other.
`
`5,
`
`The secondary battery as claimed in claim 4, wherein a heat
`
`generation preventing part is provided between a welding spot of the first connection
`
`part and a first welding spot of the secand connection part adjacent to the first
`
`connection part.
`
`6.
`
`The secondary battery as claimed in claim 5, wherein the heat
`
`generation preventing part is a material having lower resistance than the first current
`
`collector or the second current collector or is a clad metal.
`
`7.
`
`The secondary battery as claimed in claim 3, wherein a welded portion
`
`of the connection plate and the sub-plate is disposed closerto the bottam surface of
`
`the case than to the top of the electrode assembly.
`
`8.
`
`The secondary battery as claimed in claim 3, wherein in the sub-plate,
`
`the second connection part is bent toward the electrode assembly from the first
`
`connection part, and the bent partion is disposed closer to the botiom surface of the
`
`case than the upper end of the electrode assembly.
`
`9.
`
`The secondary battery as claimed in claim 8, wherein in the second
`
`connection part, a plate surface facing the electrode assembly is disposed on the
`
`same plane as a plate surface of the connection plate facing the electrode assembly.
`
`
`
`WO 2023/146069
`
`PCT/KR20 22/03 7044
`
`10,
`
`The secondary battery as claimed in claim &, wherein in the second
`
`connection part, a plate surface facing the electrode assembly is disposed closer to
`
`ihe electrode assembly than 4 plate surface of the connection plate facing the
`
`electrode assembly.
`
`14,
`
`The secondary battery as claimed in claim 9 ar 10, wherein the second
`
`connection part has a welding groove concavely formed on the plate surface facing
`
`the case.
`
`12.
`
`The secondary battery as claimed in claim 2, wherein a thickness of
`
`the first current collector or the second current collector is greater than that of the
`
`connection plate and the sub-plate.
`
`13.
`
`The secondary battery as claimed in claim 12, wherein the thickness of
`
`the first currert collector or the second current collector is 4 to 5 times the thickness
`
`of the connection plate and the sub-plate.
`
`{4.
`
`Asecondary battery comprising:
`
`an electrode assembly;
`
`a case accommodating the electrode assembly; and
`
`acap assembly coupled to the case and including a first current collector and
`
`a second current collector siectrically connected to the electrode assembly and
`
`disposed parallel to the upper end of the elecirode assembly,
`
`wherein the cap assembly further comprises a pair of sub-plates electrically
`
`connecting the first current collector and the second current callector to the electrode
`
`26
`
`
`
`WO 2023/146069
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`PCT/KR2022/07 7044
`
`assembly, respectively, and at least one of the sub-plates is made of a material
`
`having lower resistance than the first current collector or the second current
`
`collector.
`
`15.
`
`The secondary battery as claimed in claim 14, wherein the cap assembly
`
`comprises:
`
`a cap plate coupled to the case:
`
`a first current collecting part having the sub-plate electrically connected to a
`
`first substrate tab provided on the first electrode plate of the electrode assembly, and
`
`a connection plate electrically connected to the first current collector and the sub-plaie;
`
`a second current collecting part having the sub-plate electrically connected to
`
`a@ second substrate tab provided on the second electrode plate of the electrode
`
`assembly, and a connection plate electrically connected to the second current
`
`collector and the sub-piate;
`
`a first terminal part having a first terminal pin coupled to and electrically
`
`connected to the first current collector and a first terminal plate coupled to and
`
`electrically connected to the first terminal pin;
`
`a second terminal part having a second terminal pin coupled to and
`
`electrically connected fo the second current collector, a second terminal piate
`
`coupled to and elecirically connected to the second terminal pin, and a conductive
`
`plate: anc
`
`an insulation member made of an insulating material provided between the
`
`cap plate and the first current collector, between the first current collector and the
`
`electrode assembly, between ihe second current collector arid the siectrode
`
`27
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`
`
`WO 2023/146069
`
`PCT/KR2022/01 7044
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`assembly, between the first terminal pin and the second terminal pin and the cap
`
`plate.
`
`16.
`
`The secondary battery as claimed in claim 15, wherein the connection
`
`plate has one end disposed parallel to the first current collector or the second current
`
`collector and the other end beni toward ihe electrode assembly, and the sub-plate is
`
`welded to the bent end.
`
`17.
`
`The secondary battery as claimed in claim 16, wherein the sub-plate
`
`comprises 4 first connection part welded io ine connection plate, and a secand
`
`connection part bent toward the electrode assembly fromthe first connection part
`
`anc electrically connected to the electrode assembly.
`
`18.
`
`The secondary battery as claimed in claim 17, wherein a heat
`
`generation preventing part is provided between a welding spot of the first corinection
`
`part and a first welding spat of the second connection part adjacent to the first
`
`connection part.
`
`1.
`
`The secondary battery as claimed in claim 18, wherein the heat
`
`generation preventing part is plated with a material having lower resistance than the
`
`first current collector or the second current collector or is a clad metal.
`
`28
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`
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