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Tab system for a metal-air electrochemical cell

A metal-air battery and tab technology, applied in battery pack components, fuel cell-type half-cells and primary-cell-type half-cells, circuits, etc., can solve the problem of low oxygen permeability, low open-circuit cell voltage, open-circuit high voltage problems

Active Publication Date: 2007-02-21
ENERGIZER BRANDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some tab systems allow too much oxygen in, which leads to too high open-circuit cell voltage (OCV) of metal-air batteries, which in turn consumes excess active material
In other metal-air batteries, where the tab system has a lower oxygen permeation rate, after removing the tab system, the open circuit cell voltage of the metal-air battery is too low, which makes users think that the metal-air battery has failed

Method used

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  • Tab system for a metal-air electrochemical cell
  • Tab system for a metal-air electrochemical cell
  • Tab system for a metal-air electrochemical cell

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0044] A number of samples of a conventional tab system and a sample of a tab system according to an example embodiment of the present invention were prepared. Each tab system sample was fabricated by bonding a first tape having a first polymer layer and a first adhesive layer to a second tape having a second polymer layer and a second adhesive layer. The first polymer layer, first adhesive layer and second adhesive layer were the same in all tab systems; only the first polymer layer was different.

[0045] Coating of first polymer layer and first adhesive layer for conventional tab systems available from Avery Dennison, FASSON Roll North America, Painesville, Ohio as FASSON(R) PRIMAX 350(R) 350 / R143 / 50 #SCK A polymeric tape of the binder having a polymer layer about 0.0035 inches thick (typical tensile The tensile stress is 160,000 psi and the typical tensile stress in the transverse direction is 50,000 psi). The polymer layer is coated with about 27 g / m 2 The FASSON(R) R1...

example 2

[0050] Specimens were cut from each tab system of Example 1 for burst pressure testing. Each sample was 0.386 inches long and 0.210 inches wide, and each of the two long ends had a radius of 0.105 inches.

[0051] In the burst pressure test, a tab system specimen is bonded or sealed to the surface of a test disc simulating the bottom surface of a button cell cathode can containing the air inlet, and passed from the opposite side of the disc through the The orifice applies pressure into the test specimen sealed against the orifice. The pressure is increased until the seal ruptures and the burst pressure of each specimen is the peak pressure measured before the seal ruptures.

[0052] The test discs were made of triple clad material 201 Nickel / 304 Stainless Steel / 201 Nickel available from Engineered Material Solutions Corporation and had a thickness of 0.0060 inches and a diameter of approximately 0.750 inches with a centrally located 0.0020 inch diameter orifice. The disks w...

example 3

[0057] Tab system samples were cut from each of the materials described in Example 2 for peel testing to measure the force required to remove the tab system from the cell. Previous tests have shown that test results are essentially independent of the raised design on the bottom surface of a button cell canister with air inlets; using Eveready No. AC-10 (type PR-70) Zn / air button cell (canister outer diameter is about 0.226 inches). The test coupon was placed in the center of the cell bottom during preparation and bonded or sealed to the cell bottom for testing. Store twenty batteries sealed together with each tab system at room temperature (20°C to 25°C) and 50% relative humidity, and store the cells sealed together with each tab system at a temperature of 60°C. Twenty batteries. After the specified storage time, test the peel strength of the sample. Those cells stored at a temperature of 60° C. were cooled to room temperature before testing, and tested at a temperature of ...

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Abstract

Various embodiments of a metal-air cell having a tab system that covers an air entry port of the metal-air cell are provided. In one representative embodiment the tab system includes polymer layer and an adhesive layer between the metal-air cell and the polymer layer. The tab system has a loss stiffness of less than 55,000 N / m at 20° C. to 25° C.

Description

technical field [0001] The present invention relates to a metal-air cell having a tab system that covers the air inlet of the metal-air cell prior to use. Background technique [0002] Metal-air batteries use oxygen directly from the atmosphere to generate electrochemical energy. Metal-air batteries typically have a negative electrode, an anode, and contain an active material such as zinc and an electrolyte such as potassium hydroxide. Metal-air batteries contain no consumable cathode material because oxygen from the atmosphere is the active cathode material. For this reason, metal-air batteries have a greater anode material capacity relative to their size and they are widely used in applications requiring moderate discharge and continuous discharge use, such as in hearing aids. The process of diffusion of oxygen into the cell initiates a series of chemical reactions that generate gas inside the cell and eventually consume the anode material. [0003] Metal-air cells typi...

Claims

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Application Information

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IPC IPC(8): H01M12/06H01M2/34H01M2/02
CPCH01M2/0222H01M12/06H01M6/30Y02E60/128H01M50/109
Inventor B·巴特林T·D·福利
Owner ENERGIZER BRANDS
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