Combined secondary battery

Abstract

To provide an assembled secondary battery capable of extending the life of the assembled secondary battery by balancing deterioration of individual cells constituting the assembled secondary battery. An integrated battery tank (2) that connects a plurality of battery tanks (3) is provided, and the upper side opening of each battery tank (3) is closed as a whole with a cover body (4), and the cover body (4) is provided so as to be connected to each other. An appropriate number of adjacent battery tanks (3) communicate with each other through passages (37), so that the internal pressure of each battery tank (3) becomes uniform.

Description

technical field [0001] The present invention relates to a combination type secondary battery composed of connecting a plurality of single cells to obtain a desired battery capacity. Background technique [0002] In order to obtain the required battery capacity, a conventional assembled secondary battery in which a plurality of single cells are connected into one is known as Figure 13 device shown. The combined secondary battery will be as Figure 14 A plurality of single cells 41 (41a-41j) constituted by the shown sealed alkaline secondary battery are arranged so that the long sides of the battery tank 42 having a wider width are overlapped and arranged to face each other, and the end plates 52 are pressed against the sides of the two ends. On the outside of the battery slot 42 of the single cells 41a, 41j, the two end plates 52, 52 are clamped by the clamping bar 53 to be integrally connected. [0003] The structure of the unit cell 41 is such that a battery container 42...

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned conventional combined secondary battery, because the plurality of single cells 41 are completely separated and sealed separately, once the internal pressure of a part of the single cells 41 is reduced due to the capacity difference and temperature difference of each single cell 41 If the value is increased, a vicious circle in which the oxidation and degradation of the pole plate of the unit battery 41 increases will occur. Therefore, the problems existing between the unit batteries 41 are that the difference in internal pressure and deterioration increases. Each of the single cells 41 is out of balance, and some of the single cells 41 have abnormalities such as overcharging and over-discharging, which reduces the life of the combined secondary battery.

[0006] In addition, each unit cell 41 is provided with a safety valve for releasing gas to the outside when the internal pressure of the unit cell 41 exceeds a certain pressure, so there is a problem that the number of safety valves installed increases the cost.

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