Secondary battery

• US 10,644,285 B2
• Filed: 06/14/2016
• Issued: 05/05/2020
• Est. Priority Date: 01/07/2016
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Lee, Kwan Soo, Ryu, Duk Hyun
• Primary Examiner(s): Ohara, Brian R
• Application Number:
  US15/747,640
• Publication Number:
  US 20180219199A1
• Time in Patent Office: 1,421 Days
• Field of Search: None
• CPC Class Codes: H01M 10/04 Construction or manufacture in general H01M10/058, H01M10/12, H01M10/28, H01M10/38 take precedence
• CPC Class Codes: H01M 10/0422 Cells or battery with cylindrical casing
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/058 Construction or manufacture
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 50/317 Re-sealable arrangements
• CPC Class Codes: H01M 50/3425 in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
• CPC Class Codes: H01M 50/533 characterised by the shape of the leads or tabs
• CPC Class Codes: H01M 50/595 Tapes
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

The present invention relates to a secondary battery that is capable of preventing corrosion within the battery from occurring. Also, the secondary battery according to the present invention includes an electrode assembly provided with an electrode tab, a can member accommodating the electrode assembly and comprising a vent part for discharging a gas when internal pressure increases, and a protection member preventing the electrode tab and the vent part from coming into contact with each other.

Claims

1. A secondary battery comprising:

an electrode assembly provided with an electrode tab;

a can member accommodating the electrode assembly and comprising a vent part for discharging a gas when an internal pressure increases, the can member having a top opening and a circular bottom portion opposite the top opening, the bottom portion having a nickel layer plated onto an inner surface thereof, the can member having a cylindrical side wall extending away from the bottom portion and extending circumferentially around the electrode assembly, the vent part being an area of the bottom portion that is thinner than a remainder of the bottom portion, a portion of the nickel layer being absent at the vent part of the bottom portion, the electrode tab being directly attached to the bottom portion at the remainder of the bottom portion and not directly attached to the vent part; and

a protection member attached to the electrode tab only along a portion of the electrode tab that has a length between 2 mm and 7 mm, the protection member preventing the electrode tab and the vent part from coming into contact with each other, the protection member extending between the electrode tab and the vent part at the portion of the nickel layer that is absent, the protection member having a first surface directly attached to the electrode tab and having a second surface opposite the first surface that is directly attached to the vent part.

2. The secondary battery of claim 1, wherein the protection member comprises at least one adhesion film made of polypropylene (PP), polyimide (PI), or polyester (PET).

3. The secondary battery of claim 1, wherein the protection member has a thickness of 3 um to 50 um.

4. The secondary battery of claim 1, wherein the electrode tab comprises a negative electrode tab.