Secondary battery metal terminal coating resin film, method for manufacturing same and battery pack

• US 10,644,273 B2
• Filed: 07/02/2015
• Issued: 05/05/2020
• Est. Priority Date: 01/07/2013
• Status: Active Grant

• Current Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Original Assignee: Toppan Printing Co., Ltd. (TOPPAN Holdings, Inc.)
• Inventors: Takada, Takehisa
• Primary Examiner(s): Ruddock, Ula C
• Assistant Examiner(s): Parsons, Thomas H.
• Application Number:
  US14/790,990
• Publication Number:
  US 20150311483A1
• Time in Patent Office: 1,769 Days
• CPC Class Codes: B29C 2948/92647 Thickness
• CPC Class Codes: B29C 2948/92695 Viscosity; Melt flow index [MFI]; Molecular weight
• CPC Class Codes: B29C 2948/92876 Feeding, melting, plasticising or pumping zones, e.g. the melt itself
• CPC Class Codes: B29C 2948/92942 Moulded article
• CPC Class Codes: B29C 48/0018 combined with shaping by orienting, stretching or shrinking, e.g. film blowing B29C48/0017 takes precedence
• CPC Class Codes: B29C 48/03 characterised by the shape of the extruded material at extrusion
• CPC Class Codes: B29C 48/92 Measuring, controlling or regulating
• CPC Class Codes: B29C 55/28 of blown tubular films, e.g. by inflation extrusion moulding of tubular films B29C48/03
• CPC Class Codes: B29K 2023/06 PE, i.e. polyethylene
• CPC Class Codes: B29K 2023/12 PP, i.e. polypropylene
• CPC Class Codes: B29L 2009/00 Layered products
• CPC Class Codes: B29L 2009/003 comprising a metal layer
• CPC Class Codes: B29L 2031/3468 Batteries, accumulators or fuel cells battery cases B29L2031/7146
• CPC Class Codes: B29L 2031/3481 Housings or casings incorporating or embedding electric or electronic elements
• CPC Class Codes: B32B 2457/10 Batteries
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 7/027 Thermal properties
• 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 50/119 Metals
• CPC Class Codes: H01M 50/121 Organic material
• CPC Class Codes: H01M 50/129 : with two or more layers of only organic material
• CPC Class Codes: H01M 50/133 : Thickness
• CPC Class Codes: H01M 50/136 : Flexibility or foldability
• CPC Class Codes: H01M 50/188 : the sealing members being arranged between the lid and terminal
• CPC Class Codes: H01M 50/193 : Organic material
• CPC Class Codes: H01M 50/197 : having a layered structure
• CPC Class Codes: H01M 50/198 : characterised by physical properties, e.g. adhesiveness or hardness
• CPC Class Codes: H01M 50/562 : characterised by the material
• CPC Class Codes: H01M 50/564 : characterised by their manufacturing process
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries

Abstract

A secondary battery metal terminal coating resin film having improved overall performance and capable of securing filling ability, adhesive properties, insulating properties of a lead end portion and shape retention properties of a sealant, a manufacturing method for the same and a battery pack using the secondary battery metal terminal coating resin film in provided in the lead end portion of a tab used for a laminate-type packaging material for a secondary battery. The secondary battery metal terminal coating resin film (24) according to the present invention is laminated, coating metal terminal (26) connected to a positive electrode or a negative electrode of a secondary battery. The melt flow rate of at least one layer of a resin that constitutes the resin film (24) is within a range from about 0.1 g/10 minutes to about 2.5 g/10 minutes.

Claims

1. A resin film for coating secondary battery metal terminals, comprising:

a laminated structure that is capable of coating metal terminals connected to a positive electrode and a negative electrode of a secondary battery,

wherein the resin film has three layers including a core layer as an intermediate layer of the resin film and skin layers as other layers of the resin film,

wherein the core layer is sandwiched between the skin layers, and the skin layers are made of a same material,

wherein a difference of a melt flow rate between the core layer and the skin layers is within a range from about 5 g/10 minutes to about 30 g/10 minutes,

wherein the melt flow rate of the core layer is within a range from about 0.5 g/10 minutes to about 1.5 g/10 minutes and wherein the melt flow rate of each of the skin layers is within a range from 7 g/10 min to 20 g/10 min;

wherein a film thickness of the core layer is between 40 μ

m and 60 μ

m and a film thickness of each of the skin layers is between 30 μ

m and 45 μ

m,

wherein an anticorrosion protective layer is formed on a surface of a lead of the positive electrode, and

wherein a surface of each of the positive electrode and the negative electrode is treated with a non-chromium surface treatment, wherein the core layer comprises polypropylene and each of the skin layers comprise acid modified polypropylene and wherein the resin film is manufactured by three-layer inflation molding.

2. A battery pack comprising the resin film for coating secondary battery metal terminals according to claim 1.