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Problems solved by technology
However, these sintered substrates do not have sufficient strength, and they are particularly weak against stress applied from the thickness direction
This can create problems similar to the first technique
Method used
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[0024] 1-1 The structure of alkaline battery
[0025] figure 1 is a perspective view showing a cross section of a cylindrical alkaline storage battery (Ni-MH storage battery) which is an embodiment of a sintered substrate produced by the method of the present invention. In this embodiment, a sintered substrate is used as the positive electrode 1 .
[0026] The alkaline storage battery consists of a set of electrodes 4 and a cylindrical case 6 of AA size. The electrode group 4 impregnated with an electrolytic solution is installed in a cylindrical case 6 . The electrode group 4 is formed by spirally winding the positive electrode 1 and the negative electrode 2 with the separator 3 in between.
[0027] The negative electrode 2 is formed of a Ni-plated porous iron substrate such as punched metal. Before sintering, a paste containing hydrogen absorbing alloy is applied to the substrate. The negative electrode 2 is connected to the inner bottom surface of the casing 6 through...
Embodiment 1
[0044] First, the carbonyl nickel powder with an average diameter of 2 microns and an apparent density of 0.5 g / cubic centimeter is mixed with water and methylcellulose (carbonyl nickel powder-100% by weight, water-100% by weight, methylcellulose 2 % by weight), and then 10% by weight of Ni-coated porogen particles were added to the mixture. The porogen particles are made of resins, such as acrylonitrile and methyl methacrylate, and their surfaces are coated with a nickel layer with a thickness of 1 micrometer to 5 micrometers (specifically, those particles are coated with nickel). Then, the mixture was stirred to prepare a slurry. The slurry is applied to the surface of a punched metal or nickel plated Fe core, dried and sintered in a furnace at 800°C - 1000°C.
[0045] During sintering, the resin component of the paste disappears, leaving its nickel-plated part in the form of a nickel shell. At the same time, the punched metal, nickel shell and nickel particles are partial...
Embodiment 2-A
[0047] While the ball-forming porogen particles were made of solid resin particles in Example 1, the ball-forming porogen particles used in the matrix of Example 2-A were hollow and nickel-plated (these hollow spaces were filled with low boiling point hydrocarbons such as butane and methane). For Example 2-A, 8% by weight of these hollow porogen particles were used. Note that hollow porogen particles can be used to make substrates of the present invention. In the early stages of the sintering process, the low-boiling hydrocarbons filling the hollow spaces disappear, which promotes the pore-forming process. Except for this point, the substrate of this Example 2-A is the same as the substrate of Example 1.
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Abstract
A manufacturing method for a sintered substrate of alkaline batteries is provided. The manufacturing method includes a first step for mixing particles with a pore former and applying the mixture to a porous substrate, and a second step for sintering the porous substrate and the applied mixture. The particles are made of nickel or principally made of nickel, and the surfaces of the pore former particles each have a coating made of nickel or principally made of nickel. In this method, nickel frameworks are formed on the surface of the porous substrate, with relatively small spaces and relatively large pores formed in place of the pore former particles which disappear in the second step. A formed substrate has a greater porosity than a conventional substrate. Having been sintered, the nickel coatings on the surfaces of the particles transform themselves into inner walls of relatively large pores. This gives strength and thickness to the nickel frameworks surrounding those pores, reducing the probability of brittle failure. This means that the sintered substrate achieves a greater porosity without degrading a high level of strength. The pore former can be made from resin or any other materials if it disappears when sintered. The pore former particles should preferably have a spheric shape, but it does not matter whether the pore former particles are solid or hollow. Using such sintered substrate for an electrode, an alkaline storage battery can exhibit a high performance.
Description
technical field [0001] The present invention relates to a sintered base plate of an alkaline storage battery and a manufacturing method thereof. Background technique [0002] As a substrate grid for an electrode of an alkaline storage battery including a nickel-hydrogen storage battery, a sintered substrate is generally used. A sintered substrate is formed by applying nickel powder to a porous substrate made of nickel or the like and sintering the substrate. Among them, the porous substrate is punched metal and punched nickel plate. An electrode can be formed by impregnating a sintered substrate with an active material. However, producing alkaline batteries with higher energy density requires increasing the amount of impregnated active material, since the operation of the battery is heavily dependent on the active material. In order to meet this requirement, it is preferred that the sintered substrate has a high porosity and retains a sufficient amount of active material ...
Claims
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