Secondary Battery And Sealing Block

Patent metadata

Field	Value
Publication number	US-2022393299-A1
Application number	US-202017772847-A
Country	US
Kind code	A1
Filing date	Aug 26, 2020
Priority date	Nov 13, 2019
Publication date	Dec 8, 2022
Grant date	—

Abstract

A secondary battery according to an embodiment of the present disclosure may include an electrode assembly and a pouch-type batter. The battery case may include a cup part to accommodate electrode assembly. A sealing part may extend outward from an edge of the cup part and may be sealed. A venting device may be inserted into the sealing part through which a gas inside the cup part may be discharged to the outside. The sealing part may include a vent sealing portion into which the venting device may be inserted, and a weak sealing portion which may be positioned between the vent sealing portion and the cup part and sealed more weakly than the periphery thereof.

First claim

1 . A secondary battery comprising:
an electrode assembly including an electrode and a separator; and a pouch-type battery case to accommodates the electrode assembly therein, wherein the pouch-type battery case comprises: a cup part with an accommodation space to accommodates the electrode assembly therein; a sealing part extending outward from the cup part, the sealing part including upper and lower portions, the upper and lower portion configured to form a first seal by contacting each other; and a venting device inserted into the sealing part, the venting device configured to discharge a gas from the cup part to an outside, wherein the sealing part comprises: a vent sealing portion into which the venting device is inserted; and a weak sealing portion positioned between the vent sealing portion and the cup part a sealing strength of the weak sealing portion being less than the first seal.

2 . The secondary battery of claim 1 , wherein the weak sealing portion has a width corresponding to a width of the vent sealing portion.

3 . A sealing block to seal a sealing part of a pouch-type secondary battery, the sealing block comprising:
a main body including at least one groove recessed inward from a sealing surface of the main body, the sealing surface configured to directly contact a sealing part of a pouch-type secondary battery, wherein the groove comprises: a vent groove to receive a venting device that discharges a gas inside a cup part of the pouch-type secondary battery to an outside, the vent groove sealing the venting device to the sealing part; and a weak sealing groove positioned between the vent groove and the cup part when the sealing surface contacts the sealing part.

4 . The sealing block of claim 3 , wherein the main body includes a lead groove to receive an electrode lead supplying electricity to the outside of the pouch-type secondary battery, the lead groove configured to seal the electrode lead to the sealing part.

5 . The sealing block of claim 4 , wherein the weak sealing groove has a height less than that of the lead groove.

6 . The sealing block of claim 4 , wherein the lead groove extends from a first edge in a width direction of the sealing surface, the first edge extending in a longitudinal direction of the sealing surface.

7 . The sealing block of claim 6 , wherein the lead groove extends to a second edge facing the first edge.

8 . The sealing block of claim 3 , wherein the weak sealing groove has a width corresponding to a width of the vent groove.

9 . The sealing block of claim 3 , wherein the weak sealing groove extends from a first edge to the vent groove, the first edge extending in a longitudinal direction of the sealing surface.

10 . The sealing block of claim 3 , wherein the main body has a width greater than or equal to a width of the sealing part and a length greater than or equal to a length of the sealing part.

11 . The sealing block of claim 3 , wherein the main body further comprises a cylinder disposed in the weak sealing groove, the cylinder configured to moves linearly in a vertical direction to adjust a height of the weak sealing groove.

Assignees

• Lg Energy Solution Ltd

Inventors

• Ryu Ji Hoon
• Lee Eun Ju
• Kim Seok Koo
• Lee Ji Eun
• Choi Soon Ju

Classifications

• H01M50/186

  characterised by the disposition of the sealing members · CPC title

• H01M50/105 Primary

  Pouches or flexible bags · CPC title

• H01M50/3425 Primary

  in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2200/20

  Pressure-sensitive devices · CPC title