Drum shape alkali accumulator and drum-shap nickle-hydrogen secondary cell

Abstract

Provided is a cylindrical alkaline storage battery suitable for increasing capacity and suppressing drop in high rate discharge characteristics and battery life. The cylindrical alkaline storage battery has an outer can housing an electrode group and having an outer diameter of 13.5-14.5 mm. The electrode group is formed by spirally winding a positive plate and a negative plate 26 through a separator and the negative plate 26 in the outermost peripheral part comes in contact with an inner peripheral wall of the outer can. The thickness of the positive plate is 0.95 mm or more, a negative electrode core 46 of the negative plate 24 holding a negative active material layer is made of a sheet-like metallic conductor having a plurality of through holes 47, the negative active material layer contains an inner layer 48 covering the inner surface in the radial direction of the negative electrode core 46, an outer layer 50 covering the outer surface in the radial direction of the negative electrode core 46, and a filling layer 49 filled in the through holes 47 of the negative electrode core 46, and the ratio of counter parts is set to 75-100%.

Description

technical field [0001] The present invention relates to a cylindrical alkaline storage battery suitable for high capacity. Background technique [0002] As the alkaline storage battery, depending on the type of active material contained, for example, nickel-cadmium secondary battery, nickel-hydrogen secondary battery, etc. can be cited. Among these alkaline storage batteries, there are cylindrical batteries with cylindrical outer packaging tanks Battery. The outer packaging tank is sealed by a cover with a safety valve, and an alkaline electrolyte and an electrode group are housed inside it. The electrode group is formed by sandwiching a separator between a strip-shaped negative electrode plate and a positive electrode plate and winding them in a spiral shape, and a part of the negative electrode plate wound on the outermost periphery of the electrode group is brought into contact with the inner peripheral wall of the outer packaging can. The state is stored in the outer p...

AI Technical Summary

Problems solved by technology

Therefore, although the amount of electrolyte contained in the positive electrode plate, the positive electrode portion of the negative electrode plate, and the separator sandwiched between them is subtracted from the total amount of electrolyte solution, the amount contained in the negative electrode plate The amount after facing the amount of electrolyte solution in the positive electrode part, but when a part of the alkaline electrolyte solution is contained in the part of the negative electrode plate not facing the positive electrode part in the case of a capacity liquid ratio of 0.85ml / Ah or less, the battery The amount of alkaline electrolyte in the reaction site will be insufficient, and the resistance between the positive plate and the negative plate will increase, resulting in a decrease in discharge characteristics.

[0012] In addition, when continuous charging is performed at low temperature, the positive plate expands and absorbs the electrolyte, so the discharge performance of the battery with a small amount of electrolyte decreases after continuous charging, and a large voltage drop occurs in the initial stage of discharge.

For the low-temperature continuous charging characteristics, it will also be significantly reduced when the capacity-to-liquid ratio is below 0.85ml / A

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