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Battery and method of its manufacture

A manufacturing method and battery technology, which are applied in battery pack parts, battery boxes/jackets, battery box/cover materials, etc., can solve the problem of corrosion and cracking of metal shells, not very ideal, miniaturization and light weight of battery metal shells problems, etc.

Inactive Publication Date: 2007-07-04
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, the quality, reliability and safety of this type of battery are indispensable. In the past, in order to achieve miniaturization and light weight, it has been done to improve the energy density of the battery while taking into account the quality, reliability and safety of the battery. not enough
[0015] In addition, in the work plan for making a metal case, even if the DI work plan is used to form a cylindrical battery by deep drawing and thinning, if extreme miniaturization and weight reduction are sought, the metal case will be corroded. And bad situations such as rupture, not very ideal
In addition, square batteries used to be deep-drawn to make the casing, and there are still problems in the miniaturization and weight reduction of the metal casing of the battery.

Method used

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  • Battery and method of its manufacture
  • Battery and method of its manufacture
  • Battery and method of its manufacture

Examples

Experimental program
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Effect test

Embodiment 1

[0038] First, a cylindrical nickel-metal hydride storage battery as the battery of the present invention will be described by taking a battery whose metal case is mainly composed of iron and at least a nickel layer is disposed on the inner surface of the battery case.

[0039] First, the metal case used in this type of battery will be described. As shown in Figure 2, the material used is the cold-rolled steel plate of the SPCE grade of aluminum-killed steel (the carbon content is 0.04wt%). Nickel-plated steel plate 2. The nickel-plated steel plate was first cut into a circle, and a bottomed cup 3 with an outer diameter of 21.5 mm and a height of 15.5 mm was produced by deep drawing under pressure. Compared with the raw material, the state of the cup 3 has no significant change in the thickness of the bottom and the thickness of the side wall.

[0040] Then put the bottomed metal cup 3 into the D1 metal mold, and make a DI bottomed metal shell 4 with an outer diameter of 13.8...

Embodiment 2

[0059] As the battery of the present invention, a prismatic lithium-ion secondary battery in Embodiment 1 of a battery in which the material of the metal case is mainly iron and a nickel layer is disposed on at least one side of the battery will be described as an example.

[0060] First, the metal case used in this battery will be described. As the raw material, the cold-rolled steel plate SPCE of aluminum-killed steel is nickel-plated on both sides of about 3.5 microns, and after heat treatment, the nickel-plated steel plate with a thickness of 0.4 mm. Firstly, the nickel-plated steel plate is cut into a rectangle, and a metal cup with a bottom is produced by deep drawing with a press. In this state of the cup, the bottom thickness and the side wall thickness are not significantly changed from those of the raw material.

[0061] This bottomed metal cup is introduced into the DI metal mold again, and the outer dimensions are made by continuous thinning and deep drawing. The ...

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Abstract

A battery has elements for electromotive-force accommodated in a metal outer can (1), the metal outer can (1) being a metal can (4) with a bottom having a cylindrical shape and a bottom thickness (TA) / side thickness (TB) value of 2.5 &tilde& 5.0. The metal outer can (1) consists chiefly of iron and a nickel layer (8) is provided on at least the inner face of the battery. A multiplicity of shallow grooves (7) perpendicular to the bottom face are formed on the surface of the nickel layer (8). In the method, an iron-based metallic sheet formed with a nickel layer (8) on at least one face is subjected to drawing forming into a tubular shape having a bottom. Continuous ironing processing is performed such that the side of the can formed in the tubular shape has an ironing ratio in the range 20 &tilde& 90% and a metal outer can (1) is thereby manufactured having a bottom thickness (TA) / side thickness (TB) value of 2.5 &tilde& 5.0, having a cylindrical shape. A multiplicity of shallow longitudinal grooves are formed in the nickel layer (8) provided on the battery inside face.

Description

technical field [0001] The present invention relates to batteries such as primary batteries and secondary batteries. In particular, inventions related to the improvement of metal casings for cylindrical and prismatic batteries. Background technique [0002] In recent years, with the increasing popularity of portable devices, the demand for small primary batteries and secondary batteries has been increasing. As primary batteries, mainly manganese dry batteries, alkaline manganese dry batteries, and lithium batteries are widely used for various purposes. In addition, as secondary batteries, in the past, alkaline storage batteries using alkaline aqueous solution as the electrolyte, that is, nickel-cadmium storage batteries, and nickel-metal hydride storage batteries using hydrogen storage alloys as the negative electrode were often used in the past. Lithium-ion secondary batteries with organic electrolytes are rushing to the market. [0003] In addition, the shape of batteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/02B21D51/26C22C38/00H01M50/103H01M50/107H01M50/119H01M50/133H01M50/134
CPCY02E60/12H01M2/0217H01M2/0225H01M2/0202H01M2/027H01M2/0287H01M2/0272H01M2/0275B21D22/28Y10T29/49108Y02E60/10H01M50/56H01M50/103H01M50/545H01M50/1243H01M50/124H01M50/133H01M50/107H01M50/119H01M50/134
Inventor 森胁良夫岩濑彰北冈进松本功
Owner PANASONIC CORP