Disclosed herein is a secondary battery having a vent member. The secondary battery may include an electrode assembly, a case including an accommodation portion to receive the electrode assembly, an electrode lead attached to the electrode assembly and a vent member. The case may include a sealing portion to seal the electrode assembly therein. The sealing portion may include a sealant resin to form a seal around the electrode assembly. The electrode lead may extend away from the case along a first direction. The sealing portion may include an inclined sealing portion adjacent the electrode lead. The inclined sealing portion may extend along a second direction. The second direction may be non-orthogonal to the first direction. The vent member may be disposed in the inclined sealing portion. The vent member may include a vent resin having a lower melting point than the sealant resin.

Disclosed herein is a secondary battery having a vent member. The secondary battery may include an electrode assembly to which an electrode lead is attached, a case including an accommodation portion. The accommodation portion may be defined by a bent side and a sealing portion. The accommodation portion may be configured to receive the electrode assembly and seal the electrode assembly therein. The sealing portion may contain a sealant resin to form a seal around the electrode assembly. The sealing portion may include an extension adjacent to and extending from the bent side. The vent member may be disposed at least partially in the extension. The vent member may include a vent resin having a lower melting point than the sealant resin.

Disclosed herein is a secondary battery having a vent member. The secondary battery may include an electrode assembly to which an electrode lead is attached, a case including an accommodation portion. The accommodation portion may be defined by a bent side and a sealing portion. The accommodation portion may be configured to receive the electrode assembly and seal the electrode assembly therein. The sealing portion may contain a sealant resin to form a seal around the electrode assembly. The sealing portion may include an extension adjacent to and extending from the bent side. The vent member may be disposed at least partially in the extension. The vent member may include a vent resin having a lower melting point than the sealant resin.

The secondary battery includes an electrode assembly to which an electrode lead is attached; a case configured to receive the electrode assembly therein; a lead film configured to surround a part of an outer surface of the electrode lead and interposed between the electrode lead and the case; a vent region formed in at least a part of the case; and a vent member inserted into the vent region and configured to contain linear low-density polyethylene having a poly dispersity index (PDI) of 4 or less, wherein the vent member has a maximum sealing strength of less than 6 kgf/15 mm at 100° C. or above and a maximum sealing strength of 6 kgf/15 mm or more at room temperature to 60° C.

Disclosed herein is a secondary battery having a vent member. The secondary battery may include an electrode assembly to which an electrode lead is attached, a battery case including an accommodation portion to receive the electrode assembly therein such that a portion of the electrode lead may extend outside the battery case, a lead film disposed around an outer surface of the electrode lead, and a vent member. The battery case may include a sealing portion containing a sealant resin to form a seal at least partially around the electrode assembly. The lead film may be interposed between the electrode lead and the sealing portion. The vent member may contain a vent resin having a lower melting point than the sealant resin. The vent member may at least partially overlap or contact the lead film.

Disclosed herein is a secondary battery having a vent member. The secondary battery may include an electrode assembly to which an electrode lead is attached, a battery case including an accommodation portion to receive the electrode assembly therein such that a portion of the electrode lead may extend outside the battery case, a lead film disposed around an outer surface of the electrode lead, and a vent member. The battery case may include a sealing portion containing a sealant resin to form a seal at least partially around the electrode assembly. The lead film may be interposed between the electrode lead and the sealing portion. The vent member may contain a vent resin having a lower melting point than the sealant resin. The vent member may at least partially overlap or contact the lead film.

An electrode body having an electrode, and a primer layer or a plurality of primer layers laminated on the electrode, wherein the at least one primer layer is an in-situ polymerizable composition layer formed from a polymerization product of an in-situ polymerizable composition, a method for producing an electrode body, and an electrochemical element.

An electrochemical device includes an electrode assembly, a housing, a sealing member, and a tab. The housing includes a main body portion and a sealing portion. At least a portion of the sealing member is disposed in the sealing portion, and the sealing member includes a first sealing member and a second sealing member. The tab protrudes from the sealing portion and is arranged between the first sealing member and the second sealing member. The first sealing member includes a first sealing layer and a second sealing layer disposed on the first sealing layer, and the first sealing layer is located between the tab and the second sealing layer. A melting point of the first sealing layer is lower than that of the second sealing layer, and a difference in the melting point between the first sealing layer and the second sealing layer is 35° C. to 50° C.

An electrochemical device includes an electrode assembly, a housing, a sealing member, and a tab. The housing includes a main body portion and a sealing portion. At least a portion of the sealing member is disposed in the sealing portion, and the sealing member includes a first sealing member and a second sealing member. The tab protrudes from the sealing portion and is arranged between the first sealing member and the second sealing member. The first sealing member includes a first sealing layer and a second sealing layer disposed on the first sealing layer, and the first sealing layer is located between the tab and the second sealing layer. A melting point of the first sealing layer is lower than that of the second sealing layer, and a difference in the melting point between the first sealing layer and the second sealing layer is 35° C. to 50° C.

An electrochemical apparatus includes a case and a wound electrode assembly disposed inside the case. The electrode assembly includes a first electrode plate, a second electrode plate, a first separator or a second separator provided therebetween. A first adhesive layer is provided on at least one of a surface of the first separator facing away from a center of the electrode assembly or a surface of the second separator facing away from a center of the electrode assembly. At least one of the first separator or the second separator extends out from a terminating end of the electrode assembly and is bonded to the case through the first adhesive layer. A bonding area between the first adhesive layer and the case is greater than or equal to 10% of a contact area between the case and the electrode assembly.