Vent Sealing Cap for Secondary Battery and Secondary Battery Including the Same

Patent metadata

Field	Value
Publication number	US-2024380068-A1
Application number	US-202218563165-A
Country	US
Kind code	A1
Filing date	Jun 16, 2022
Priority date	Jun 18, 2021
Publication date	Nov 14, 2024
Grant date	—

Abstract

The present invention relates to a vent sealing cap for a secondary battery and a secondary battery including the same.
The vent sealing cap for a secondary battery may includes a body having a hollow therein, an intake port provided on the body, an exhaust port provided above a position, at which the intake port is disposed; on the body, and an opening/closing member provided in the hollow within the body to open or close connection between the intake port and the exhaust port while moving by a change in pressure of the intake port.

First claim

1 . A vent sealing cap for a secondary battery, comprising:
a body defining an inner hollow space; an intake port provided on the provided at a first location on the body; an exhaust port second location on the body, the second location being different from the first location; and an opening/closing member disposed within the hollow space to open or close a fluid communication between the intake port and the exhaust port in response to a change in pressure of the intake port.

2 . The vent sealing cap of claim 1 , wherein the intake port is provided on a side surface of the body.

3 . The vent sealing cap of claim 2 , wherein the exhaust port is provided on the side surface of the body,
the exhaust port extending along a first axis and the intake port extending along a second axis, the first axis being different from the second axis.

4 . The vent sealing cap of claim 1 , wherein the opening/closing member opens the fluid communication between the intake port and the exhaust port when a pressure of the intake port is greater than a preset value, and
the opening/closing member closes the fluid communication between the intake port and the exhaust port when the pressure of the intake port is less than the preset value.

5 . The vent sealing cap of claim 1 , wherein the opening/closing member comprises an elevation assistance groove that is opened in a direction in which a gas is introduced through the intake port, the elevation assistance groove having a recessed shape toward a central portion of the opening/closing member.

6 . The vent sealing cap of claim 5 , wherein the elevation assistance groove is provided in a hairpin structure comprising an inlet, through which the gas is introduced, and a head having a spherical shape with a diameter greater than a width of the inlet.

7 . The vent sealing cap of claim 1 , wherein the body has a transverse cross-section defining a circular shape.

8 . The vent sealing cap of claim 7 , wherein a spiral guide groove is formed in an inner circumferential surface of the body.

9 . The vent sealing cap of claim 8 , wherein a spiral guide protrusion is formed on an outer circumferential surface of the opening/closing member,
the guide protrusion being inserted into the guide groove of the body so as to be elevated.

10 . The vent sealing cap of claim 1 , wherein the intake port comprises a member contracts due to heat absorption.

11 . The vent sealing cap of claim 1 , wherein the exhaust port comprises an alarm generation device configured to generate a signal by sensing a flow of a gas.

12 . The vent sealing cap of claim 1 , wherein the body comprises:
a movable part having a cross-sectional area of the hollow space, which is the same as a transverse cross-sectional area of the opening/closing member such that the opening/closing member is movable when the hollow space is sealed; and a stopping part provided below the movable part and having a cross-sectional area of the hollow space, which is less than the transverse cross-sectional area of the opening/closing member such that a movement of the opening/closing member is stopped.

13 . The vent sealing cap of claim 12 , wherein the exhaust port is formed on a side surface of the movable part, and
the intake port is formed on a side surface of the stopping part.

14 . The vent sealing cap of claim 12 , wherein the intake port is formed on a side surface of the movable part, and
the intake port is formed on a bottom surface of the stopping part.

15 . The vent sealing cap of claim 1 , wherein at least one of the body, the intake port, the exhaust port, or the opening/closing member is made of at least one of poly phenylene sulfide (PPS), poly imide (PI), aluminum (Al), or stainless steel (SUS).

16 . A secondary battery comprising:
an electrode assembly in which a positive electrode, a separator, a negative electrode, and a separator are stacked; a battery case in which the electrode assembly is accommodated; and a vent sealing cap provided in the battery case, wherein the vent sealing cap comprises: a body defining an inner hollow space; an intake port provided at a first location on the body; an exhaust port provided at a second location on the body, the first location being different from the second location; and an opening/closing member within the hollow space to open or close a fluid communication between the intake port and the exhaust port in response to a pressure difference of the intake port.

17 . The secondary battery of claim 16 , wherein the opening/closing member comprises an elevation assistance groove that is opened in a direction, in which a gas is introduced through the intake port, the elevation assistance groove having a recessed shape toward a central portion of the opening/closing member.

18 . The secondary battery of claim 17 , wherein the elevation assistance groove is provided in a hairpin structure comprising an inlet, through which the gas is introduced, and a head having a spherical shape defining a diameter greater than a width of the inlet.

19 . The secondary battery of claim 16 , wherein at least one of the body, the intake port, the exhaust port, or the opening/closing member is made of at least one of poly phenylene sulfide (PPS), poly imide (PI), aluminum (Al), or stainless steel (SUS).

Assignees

• Lg Energy Solution Ltd

Inventors

• Oh Sang Seung
• Lim Sung Chul

Classifications

• H01M10/48 Primary

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• H01M50/3425

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

• H01M50/105

  Pouches or flexible bags · CPC title

• H01M50/325

  comprising deformable valve members, e.g. elastic or flexible valve members · CPC title

• H01M50/317

  Re-sealable arrangements · CPC title