JPS6041642Y2 - rechargeable battery equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rechargeable battery device that detachably connects a battery case and a load case.

In this type of device, the built-in rechargeable battery is charged by connecting the battery case to a charger, and in conventional devices, the rechargeable battery is trickle charged, so battery devices are used less frequently. It is suitable for things that are used frequently, but it is not suitable for things that are frequently used.

Therefore, by rapidly charging the battery to be charged, it becomes suitable for those that are used frequently, but as a means to prevent overcharging of the battery, the temperature of the battery is detected in series with the battery and the resistance value increases. It is conceivable to provide a positive characteristic heat-sensitive resistance element.

However, once the resistance value of the element increases, the charging current for the battery decreases, the battery temperature decreases, and the rapid charging current flows into the battery again, which may cause the battery to be overcharged.

The present invention has been devised in view of these points, and one embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of the battery case, charger stand, and load case.

The battery case 1 houses a battery to be charged 3 made up of a plurality of unit cells 2 and a thermostat 4 connected in series to detect a temperature rise during charging of the battery and stop charging the battery.

The battery case 1 is formed into a T-shape having an upper bulging part 5 and a lower protruding part 6. On the side surface of the lower protruding part 6, there are terminals a1 led from the anode of the battery 3, the cathode of the battery 3, and the thermostat 4. A terminal C led from the connection point with one end and a terminal C led from the other end of the thermostat 4 are provided.

As shown in FIG. 2, the thermostat 4 has a movable piece 7 and a fixed contact 8, and the movable piece 7 is reversed by a snap action between a closing position shown by a solid line and a closing position shown by a broken line.

When charging the battery 3, the movable piece 7 is in the closed circuit position, but when the battery temperature rises due to charging, this temperature is detected and the movable piece 7 is reversed to the closed circuit position to stop charging the battery 3.

A through hole 9 associated with the thermostat 4 is provided on the lower surface of the upward bulging portion 5 of the battery case 1, and within the through hole is a return button for returning the movable piece 7 that is in the open circuit state to the closed circuit state. 10 is provided so that it does not protrude from the through hole 9.

The charger stand 11 has a recessed hole 12 deep enough to fit the downward protrusion 6 of the battery case 1, and the lower part of the recessed hole is provided with power supply terminals d and e that contact the terminals a and C of the battery case 1. As shown in FIG. 3, the charger stand includes a step-down transformer 13, rectifier diodes 14, 14, and current limiting resistor 15.

The load case 16 contains the load 17 of the battery 3 and is electromechanically coupled to the battery case 1 .

For this purpose, the upper surface of the load case 16 has a coupling hole 18 into which the downward protrusion 6 of the battery case 1 fits, and the bottom of the coupling hole has power receiving pieces f and g that contact the terminals a and b of the battery case 1. is provided.

Further, a return pin 19 is provided on the top surface of the load case 16, which engages with the through hole 9 of the battery case 1 when coupled with the battery case 1, presses the return button 10, and closes the movable piece 7. There is.

In the above configuration, the battery case 1 is connected to the charger stand 1
1, as is clear from the electrical circuit diagram in FIG. .

In this case, since the charging current is set to be IC, for example, the battery 3 is charged quickly.

As the charging time progresses, the battery temperature rises, and when it reaches a predetermined value, the thermostat 4 detects this temperature and its movable piece 7 is reversed to an open state by a snap action, stopping charging of the battery 3.

Even when left as is, the movable piece 7 remains in an open state, and the thermostat 4 will not close again due to a drop in battery temperature and the battery 3 will not be charged.

When the battery case 1 that has been fully charged is connected to the load case 16, the terminals a and b of the battery case 1 are connected to the power receiving pieces f and g of the load case 16, respectively, and the load 17 can be operated.

In this case, by combining both cases 1 and 16, the return pin 19
is engaged with the through hole 9 of the battery case 1, and the return button 10 is pressed as described above.
is pressed to return the movable piece 7 of the thermostat 4 from the open state to the closed state.

In this embodiment, the battery to be charged 3 is a battery whose temperature on the side of the outer can becomes higher than the internal temperature due to a charging chemical reaction.

Such a battery is formed, for example, as follows.

That is, FIG. 5 shows a cross-sectional view of a spiral electrode body of a battery. In this figure, an auxiliary separator 22 is attached to the center of a main separator 21, an anode plate 23 in which a nickel sintered substrate is filled with nickel hydroxide, and a nickel A separator 21 is placed between a sintered substrate and a cathode plate 24 filled with cadmium hydroxide.
It is wound with 22 or 21 interposed.

With this configuration, the gas permeability of the separator at the outer peripheral portion is higher than that of the separator at the center of the spiral electrode body.

For this reason, the oxygen gas generated as the fully charged state approaches, because the gas permeability of the separator in the center is poor, stays in the separator and becomes a resistor, reducing the current density in the center of the spiral electrode body.

On the other hand, the gas permeability is good at the outer periphery, and the current density is also increased to the extent that it is lowered at the center.

That is, when gas generation starts, the current density is concentrated at the outer circumference, and more gas is generated and absorbed in the outer circumference, resulting in a rapid temperature rise.

In other words, the rise in the surface temperature on the side of the outer battery case becomes more rapid than that of the internal temperature.

Incidentally, instead of using the main and auxiliary separators 21 and 22, one separator may be used, and a portion of the center thereof may be exposed to sunlight.

As described above, according to the present invention, the thermostat built into the battery case uses a thermostat that detects the temperature rise of the battery to be charged during charging and whose movable piece reverses by snap action. A load case that is capable of preventing charging and that is provided with a through hole in the battery case and that is electromechanically coupled to the battery case and that is associated with the thermostat and that engages the through hole by coupling both cases. Since the movable piece is provided with a return pin that reverses and restores the movable piece so that the thermostat is closed, the movable piece can be placed in a charging standby state without requiring a manual return operation of the movable piece.

Furthermore, when using a battery to be charged where the temperature on the exterior can side is higher than the internal temperature, the battery temperature can rise rapidly near the fully charged state, making temperature detection easier. Accuracy can be increased.

[Brief explanation of the drawing]

The drawings show one embodiment of the rechargeable battery device according to the present invention. Fig. 1 is a side view of the battery case, charger stand and load case, Fig. 2 is an explanatory diagram of the reversing operation of the thermostat, and Fig. 3 is a side view of the battery case, charger stand and load case.
The figure is an electric circuit diagram when the battery case and the charger stand are combined, FIG. 4 is an electric circuit diagram when the battery case and load case are combined, and FIG. 5 is a sectional view of the spiral electrode body. 3...Battery to be charged, 7...Movable piece, 4
...Thermostat, 1...Battery case, 9...Through hole, 16...Load case, 19...Return pin.

Claims (2)

[Scope of utility model registration request] (1) A thermostat is built into the battery case that detects a temperature rise during charging of the battery to be charged, and the movable piece reverses with a snap action to stop charging the battery, and the case has a through hole associated with the movable piece. and the load case electromechanically coupled to the case is provided with a return pin that engages the through hole and reverses the movable piece to its original state so that the thermostat is closed. Rechargeable battery equipment. (2) The rechargeable battery device according to claim 1, wherein the battery is a battery in which the temperature on the exterior can side becomes higher than the internal temperature due to a charging chemical reaction.