JPS5832376A - Battery pack - Google Patents

Abstract

PURPOSE:To eliminate the damage of the secondary cell or the useless charging power due to the overcharge or the overdischarge of the cell, by providing the function for indicating the discharging amount of the secondary cell when containing the chargable/dischargable secondary cell. CONSTITUTION:The + terminal 2 and the - terminal 3 are fixed on the wall face of a battery case 1. The charging amount indicating member 4 is constructed of a pair of electrodes 4' and 4'' and the electrolyte 4''' such as the copper sulfate. The secondary cell 8 is contained in the battery case 1 then the charging current is supplied to the terminals 2 and 3 to start the charging. As the advance of the charging, the copper in the electrolyte 4''' will adhere to the electrode 4' in proportion to said charging amount. When comparing said adhesions or the electrodes 4' and 4'', the advance of the charging to the secondary cell 8 can be confirmed. While when comparing the amount of the copper dissolved from the electrode 4' into the electrolyte and adhered to the other electrode 4'', the discharging state can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a battery pack containing a rechargeable and dischargeable secondary battery.

In secondary batteries such as nickel-cadmium batteries,
If overdischarge occurs, the charging efficiency decreases, or conversely, if overcharge occurs, the battery may be damaged due to leakage or the like. Therefore, the secondary battery i is in a state where overdischarge does not occur, even if the amount of charge is small! ! It is necessary to stop charging the battery when it has reached 1"g to prevent overcharging, but since conventional secondary batteries do not have a function to display the amount of charge, this problem can be solved. It was something that could not be done.

The present invention has been made in view of the above, and is intended to solve the above-mentioned drawbacks by providing a battery pack with a function of displaying the amount of charge of the secondary battery.

The present invention will be explained in detail below based on Embodiment II shown in the drawings.

l is a battery case that can accommodate a secondary battery,
An e-terminal 2 and an e-terminal 3 are attached to the wall surface of the battery case 1. Reference numeral 4 denotes a charge amount display member attached to the outer wall surface of the battery case. and an electrolytic solution 7' such as copper sulfate O filled between both electrodes. 8 is a secondary battery housed in the circular portion of the battery case 1. When the secondary battery 8 is housed in the battery case 1, the terminals of this secondary battery 8 and the terminals 2. 3 and line 2 are connected to a circuit as shown in the figure. Note that 5 and 6.7 indicate resistance.

The above is the configuration of this embodiment.Next, its operation will be described. First, the secondary battery 8 is housed in the battery case l, and after connecting as shown in FIG. 2, both terminals 2 and 3 are connected. A charging current is applied to start charging the secondary battery 8.

As charging progresses, the amount of electrolyte 4" increases in proportion to the amount of charge.
The steel in ' adheres to the electrode 4'.

Therefore, by comparing the amount of adhesion, that is, the electrode 4' and l, it is possible to confirm how much charging has progressed to the secondary battery 8. Conversely, when the secondary battery B is discharged by connecting the terminal 2.3KIL load, the discharge current of the secondary battery 8 flows through the resistors 5 and 6, and the copper of the electrode 4' increases in proportion to the discharge current. The state of discharge can be detected by comparing the amount of steel deposited on both electrodes, which dissolves in the electrolytic solution and adheres to the other electrode C.

Note that the resistor 1 is a resistor for correcting the self-discharge amount of the secondary battery 8, and since a self-discharge current flows through the resistor 7 even if no load is connected to the secondary battery 8, one electrode 4'
(t) Since @ slightly shifts to the other electrode 4#, the amount of self-discharge can also be detected.

As described above, the present invention is a battery pack characterized by being equipped with a display member that displays the amount of charge and discharge of a secondary battery. The amount of charge and discharge can be detected 17@, thereby effectively eliminating damage to the secondary battery or waste of charging power due to over-discharging or over-charging of the secondary battery.

[Brief explanation of the drawing]

The drawings all show examples of the construction of the I(tsuterino) according to the present invention, and FIG.
The figure is its circuit diagram. 1.-Battery case 2.3...Terminal 4...Charge amount display member 4', 4#...Copper electrode l'...Electrolyte 5.6.7...Resistor 8... Secondary battery

Claims (1)

[Claims] A battery pack that includes a display member that displays the amount of charge and discharge of a 12-ary battery. 2. The display member is composed of a pair of spaced apart electrodes made of metal such as steel, and an electrolyte of the sulfuric acid steel section filled between both electrodes, and carries a current corresponding to the charge/discharge current of the battery. 2. The battery pack according to claim 1, wherein the amount of charge in the stain battery is displayed on the front member according to the amount of movement of metal such as copper.