Rectangular sealed battery

Abstract

A battery module is constructed with a plurality of prismatic cells. Each cell (7) comprises a prismatic cell case (3) having short lateral walls (3a) and long lateral walls, a group of electrode plates (5) constituted by laminating a plurality of positive and negative electrode plates parallel to the long lateral walls of the cell case with intervening separators therebetween, and collector plates (6) of positive and negative polarities, respectively bonded to the positive and negative electrode plates at lateral opposite ends of the group of electrode plates. Connection projections (26) are formed on the collector plates, these being fitted into corresponding holes (8) in the short lateral walls of the cell case, whereby the collector plates are fixed on the short lateral walls of the cell case.

Description

technical field [0001] The invention relates to a rectangular sealed battery in which an electrolyte solution is placed in a rectangular parallelepiped battery tank, and a positive plate and a negative plate parallel to the wide side of the battery tank are stacked with a separator sandwiched between them, and the opening of the battery tank is sealed with a cover. . Background technique [0002] In recent years, alkaline secondary batteries such as nickel-metal hydride batteries, which are excellent in energy density, have been used as power sources for automobiles. As a small and compact secondary battery capable of obtaining high power, for example, the Japanese Invention Patent Publication No. 161377 in 1995 etc. have proposed a rectangular sealed battery, the battery is filled with electrolyte in a rectangular parallelepiped battery tank and is connected with The positive plate and the negative plate on the wide side of the battery tank are stacked with a diaphragm and...

AI Technical Summary

Problems solved by technology

[0005] But, because the structure of the above-mentioned existing rectangular sealed battery is that the pole plate group 33 is fixed on the cover body 32 by the pole posts 35a, 35b, therefore, the mutual position occurs when the battery tank 31 and the cover body 32 are fused. offset, the position of the electrode plate group 33 relative to the battery tank 31 will have an error, and the above-mentioned gap t cannot be guaranteed. 1 , t 2 If the accuracy of the charging and discharging electrode plate group 33 expands and contracts, the electrode plate group 33 will be deformed, the active material cannot be effectively used, the discharge capacity will decrease, or the internal pressure will rise during charging, and the internal short circuit will occur. and active material fall off, and there is also the problem of uneven liquid distribution when the electrolyte is injected.

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