Battery pack and its charging/discharging method

Abstract

A battery pack and its charging / discharging method enabling suppression of inactivation of a secondary battery by refreshing the secondary battery such as a nickel-hydrogen battery. A battery pack (101) comprises a cell group of interconnected secondary cells, i.e., unit cells, sensors for sensing temperature and voltage, display means for displaying the state of the cell group, a switch for controlling charging / discharging of the cell group, a calculation / control circuit (4) for allowing the display means to display the state of the cell group according to the signals from the sensors and generating a signal to operate the switch. The battery pack (101) further comprises a refresh request display means (13) for displaying a message to the effect that refresh charging / discharging is necessary. There is used a method in which when the voltage of the secondary battery reaches a discharge end voltage, refresh charging / discharging is automatically performed if the recovery voltage after a predetermined elapse of time is below a predetermined voltage. With this, even a secondary battery left for a long time and inactivated can be refresh charged / discharged.

Description

technical field [0001] The present invention relates to a battery pack (battery pack) composed of a secondary battery such as an alkaline storage battery and a battery control method such as a charging and discharging method for efficiently using the battery pack, and particularly relates to a battery pack made of nickel used in such a battery pack. - A battery control method during charging and discharging of a battery composed of a secondary battery composed of a hydrogen storage battery pack, and a method of effectively using the battery capacity of the secondary batteries constituting the battery pack. Background technique [0002] In recent years, due to the rapid development of electronic technology, the miniaturization and weight reduction of electronic devices has become possible, and cordless and portable devices have developed rapidly. With the development of these devices, there has been an increasing demand for small, lightweight and high-energy-density batteries...

AI Technical Summary

Problems solved by technology

[0009] However, in such a method of counting the number of charging times, it has nothing to do with the actual charging and discharging state of the battery, and the charging / discharging is updated according to the number of charging / discharging times. Problems with charging / discharging display

If it is further specified, in the case of a charging / discharging system for updating charging / discharging whose number of times of charging / discharging is 50 times, for example, after 25 times of charging / discharging, it is left for a long time in a state of neither charging nor discharging, When the battery is deactivated, since the number of charging times is less than 50 times, the refresh charge / discharge is not performed, and because the normal charge / discharge is performed, the battery becomes deactivated while producing a memory effect, so the internal resistance becomes high. , resulting in the problem that the large current discharge cannot be fully performed, and the battery cannot be effectively used.

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