Sealed rechargeable battery and manufacturing method of the same

A secondary battery, airtight technology, used in secondary battery manufacturing, secondary batteries, battery pack components, etc., can solve problems such as reduced caulking force, inability to interrupt current paths, and increased contact resistance of internal components

Active Publication Date: 2006-11-22
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the problem to be solved for the sealing plate of the lithium ion secondary battery used in consumer equipment is that as the inner liner for sealing by caulking the metal filter, a molded liner made of synthetic resin such as polypropylene is usually used. Under the action of factors such as drop, vibration, and high temperature storage, the resin inner liner will cause a decrease in elastic force over time, which will lead to a decrease in caulking force, thereby reducing the contact resistance of internal parts. increase
[0006] In addition, the problem with the structure of JP-A-2000-90892 is that since the metal thin-walled valve body is not installed, the excessive current path cannot be blocked when the battery

Method used

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  • Sealed rechargeable battery and manufacturing method of the same
  • Sealed rechargeable battery and manufacturing method of the same
  • Sealed rechargeable battery and manufacturing method of the same

Examples

Experimental program
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Example Embodiment

[0023] (implementation plan)

[0024] With regard to the sealed secondary battery of the embodiment of the present invention, referring to the cylindrical lithium ion battery with the most significant effect, Figure one Let’s explain.

[0025] figure 1 It is a schematic longitudinal cross-sectional view of a cylindrical lithium ion battery according to an embodiment of the present invention. in figure 1 Among them, the cylindrical lithium-ion battery has a cylindrical electrode plate assembly 4 wound into a spiral shape, wherein the electrode plate assembly 4 is configured with: a positive electrode plate 1 coated with a positive electrode mixture on an aluminum foil current collector; A negative electrode plate 2 coated with a negative electrode mixture on a foil current collector; and a diaphragm 3 with a thickness of 25 μm between the two poles. The positive electrode lead current collector 5 is welded to the aluminum foil current collector by laser welding. The negative ele...

Example Embodiment

[0035] (Example 1)

[0036] figure 2 It is a configuration diagram of the sealing plate of the sealed secondary battery of the present invention. in figure 2 Among them, the sealing plate 8 is produced as follows. First, aluminum is press-worked to produce a dish-shaped metal filter net 9 having a plurality of openings. Next, after punching out aluminum with a thickness of 0.15 mm into a disc shape, a circular thin-walled portion 10a is formed by marking at the center, thereby fabricating a metal thin-walled valve body 10. Next, a polybutylene terephthalate (PBT) resin is injection-molded to produce a resin inner liner 11 of a predetermined size. Next, after punching out aluminum having a thickness of 0.15 mm into a disc shape, a C-shaped thin-walled portion 12a is formed at the center, thereby fabricating a metal explosion-proof valve body 12. After the iron is press worked, a nickel plating layer of approximately 3 μm is plated to produce a metal cap 13. The components of the...

Example Embodiment

[0041] (Example 2)

[0042] image 3 It is a configuration diagram of another sealing plate 8 of the sealed secondary battery of the present invention. For the battery made in the same manner as in Example 1, the sealing plate 8 is as image 3 As shown, after the stainless steel is press-worked, a 3 μm nickel plating layer is plated to produce a disc-shaped metal gasket 14. At the periphery of the metal cap 13 and the metal gasket 14, 8 welded parts S are formed at equal intervals by resistance welding. At the periphery of the joined member and the metal explosion-proof valve body 12, 8 welded parts S are formed at equal intervals with a laser. The thus-joined member was inserted above the resin inner liner 11 to be in contact with the metal explosion-proof valve body 12. Except for this, the sealing plate 8 obtained in the same manner as the sealing plate of Example 1 was used to obtain an example 2 sealed secondary battery.

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Abstract

A sealed rechargeable battery containing an electrode unit and a liquid electrolyte in a metallic case with a bottom that is sealed with a closure assembly. The electrode unit includes a positive electrode and a negative electrode, each made up of a collector and electrode material paste coated thereon, wound around with a separator interposed therebetween. The closure assembly includes a metallic filter that forms an internal terminal and accommodates a safety mechanism provided in case of abnormal pressure rise caused by overcharging etc, a resin inner gasket, and a metallic cap that forms an external terminal superposed upon one another. A resin inner gasket is attached to the metallic filter and the end edge of the metallic filter is crimped to provide a seal. The metallic filter and all the metallic parts encased in the metallic filter are joined together by welding. This closure assembly design enables high power output and high-current discharge of the battery with low resistance.

Description

technical field [0001] The present invention relates to a sealed secondary battery suitable for a driving power supply, and more particularly to a sealed secondary battery having a low impedance and a sealing plate structure suitable for large current discharge, and a method for manufacturing the same. Background technique [0002] Among sealed secondary batteries, lithium-ion secondary batteries are used in a variety of applications due to their light weight, small size, and high energy density, ranging from consumer equipment represented by mobile phones to electric vehicles and electric Power supply for driving tools, etc. Especially in recent years, it has attracted much attention as a power supply for driving, and research towards high energy density and high output power is in the ascendant. The sealing plate of the lithium-ion secondary battery used in the current civilian equipment generally has the structure shown in FIG. 4 . Inside the metal filter 19 constitutin...

Claims

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Application Information

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IPC IPC(8): H01M10/04H01M10/0587H01M50/152H01M50/169
CPCY02E60/10Y02P70/50
Inventor 神月清美桥本达也井上广树平川靖
Owner PANASONIC CORP
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