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Safety valve element for battery, battery case cap. and battery

A technology for safety valves and battery shells, applied to electrical components, battery pack components, circuits, etc., can solve the problems of cumbersome operating equipment, work hardening, etc., and achieve the effects of less discrete internal pressure, uniform thickness, and stable operating pressure

Inactive Publication Date: 2004-08-04
TOYO KOHAN CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, in order to obtain a uniform adhesive force by thermocompression bonding these metals, it is necessary to remove the oxide film formed on the metal surface by pre-polishing, etc., and then heat it to a high temperature of about 1000°C, which requires cumbersome operations and equipment.
Furthermore, these thin-walled metal plates are usually made by cold rolling, and most of them produce work hardening.
That is, since the above-mentioned metal material after work hardening is annealed by heating at a high temperature, the mechanical strength changes before and after heat bonding. Therefore, it is necessary to strictly control the physical properties, heating temperature, and pressing time of the material before heat bonding, so as to The problem of making the mechanical strength after heat bonding (strength of breaking when the internal pressure rises) constant

Method used

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  • Safety valve element for battery, battery case cap. and battery
  • Safety valve element for battery, battery case cap. and battery
  • Safety valve element for battery, battery case cap. and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] On a cold-rolled steel sheet with a thickness of 90 μm, circular holes with a diameter of 3 mm were arranged in a grid pattern with a pitch of 3 mm using a punch. On both sides of the orifice plate, nickel was plated with a thickness of 2 μm using a common photoelectric nickel plating solution to serve as a metal substrate.

[0065] The metal substrate and aluminum foil with a thickness of 30 μm were inserted into a vacuum chamber, and placed in a 5×10 -3 In the argon gas of ×133Pa, use the magnetron sputtering method to etch about 500 angstroms on one side of the metal substrate and about 2000 angstroms on one side of the aluminum foil. According to the calendering rate of 3%, it is rolled and cold-pressed to make a composite material. A safety valve element for batteries with a length of 10.5 mm in length and a length of 7.5 mm in length and a circular hole with a diameter of 3 mm in the center was punched out from the obtained composite material using a punch.

[0...

Embodiment 2

[0072] On a stainless steel plate with a thickness of 60 μm, circular holes with a diameter of 3 mm were arranged in a grid pattern with a hole pitch of 10.5 mm using a punch.

[0073] The stainless steel cold-rolled orifice plate and nickel foil with a thickness of 10 μm were inserted into the vacuum chamber, and placed in a 1×10 -2 In the argon gas of ×133Pa, after etching one side of the stainless steel cold-rolled orifice plate and one side of the nickel foil for about 500 angstroms by the magnetron sputtering method, the etched surfaces of the two overlap, and at room temperature with 0.5% Calendering rate Calendering, cold crimping, made into composite materials.

[0074] Seven safety valve elements for batteries with a length of 10.5 mm in length and a length of 7.5 mm in length and a circular hole in the center were taken out from the obtained composite material with a punch. After welding these safety valve elements for batteries to the steel plate pressure vessel in...

Embodiment 3

[0079] On both sides of a 90 μm cold-rolled steel sheet provided with staggered circular holes with a diameter of 3 mm arranged at a pitch of 10.5 mm, nickel with a thickness of 2 μm was plated as in Example 1.

[0080] The nickel-plated steel orifice plate and the copper foil with a thickness of 10 μm were inserted into the vacuum chamber, and the -3 In the argon gas of ×133Pa, use the magnetron sputtering method to etch one side of the nickel-plated steel orifice plate and one side of the copper foil for about 500 angstroms respectively, and then overlap the etched surfaces of the two. 0.3% calendering rate calendering, cold crimping, made into composite materials. Seven safety valve elements for batteries with a diameter of 10.5 mm and a through hole in the center were taken out from the obtained composite material with a punch.

[0081] After sealing and welding these battery safety valve elements to the steel plate pressure vessel as in Example 1, pressurization was appl...

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Abstract

A safety valve element for battery use which ruptures at a stable pressure range so as to release the inner pressure of the battery is disclosed. The safety valve element for battery use comprises a metal substrate which is provided with a perforated opening and a metal foil laminated on the metal substrate so as to close the perforated opening. A battery which is provided with such a safety valve is also disclosed. A battery case provided with such a safety valve is also disclosed. The battery and the battery case lid is produced by forming the perforated opening in the metal substrate, pressure welding the metal foil to the metal substrate and molding the clad material into a form of the battery case lid.

Description

technical field [0001] The present invention relates to a safety valve element for a battery capable of rupturing at a predetermined pressure especially at a low pressure to release internal pressure, a battery case cover equipped with a safety valve, and a battery using the same. Background technique [0002] Conventionally, in batteries that use alkali metals such as lithium, sodium, and potassium as the active material of the negative electrode, the battery may rupture due to an abnormal increase in the pressure inside the battery. valve, and various structures are proposed. In these safety valves, in order to ensure safety so that when the battery ruptures, fragments and internal substances will not be scattered and hurt people, it is particularly required to be in the 30×9.8×10 4 Operates under low pressure below Pa. [0003] In a nonaqueous battery using an alkali metal as a negative electrode active material, high sealing properties are also required. In a battery ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/10H01M2/12
CPCY02E60/12H01M2/1241Y02E60/10H01M50/3425
Inventor 高田昭良高木明西条谨二吉田一雄好本信行礒部刚彦
Owner TOYO KOHAN CO LTD