JPS6077367A - Sealed lead-acid battery - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Industrial applications The present invention relates to improvements in sealed lead acid batteries.

Conventional Structures and Problems In recent years, sealed lead-acid batteries used as power supplies for portable devices such as portable VTRs are more likely to be deformed due to heat generation than conventional lead-acid batteries. For example, these causes include rapid charging due to a large current, and an inadvertent short circuit between the positive and negative terminals. For this reason, it is necessary to ensure safety against battery heat generation and prevent deformation, and small thermostats have come to be employed as protection devices.

On the other hand, due to the diversification of needs among users of equipment such as portable VTRs, such as demands for power supplies that are heavy but have a long operating time, or light and easy to carry even if the operating time is short, There is an increasing demand for sealed lead-acid batteries with the same dimensions but different capacities and battery weights. Below, Figure 1 explains the conventional battery configuration, and Figure 2, which is a cross-sectional view of the battery on side A.
In the figure, 1 is a positive electrode plate, 2 (is a negative electrode plate, and 3 is a separator mainly made of glass fiber. This, two positive electrode plates, and three negative electrode plates constitute an electrode plate group 4. Insert this into each cell chamber 6 of a battery case made of acid-resistant resin,
The battery has a nominal voltage of 12V. The thermostat 8 is placed to constitute the electrode plate group 4. In this conventional example, in order to change the capacity and weight while keeping the external dimensions of the cell 5 the same, as shown in the sectional view of FIG. It is necessary to adjust the area using the partition 9.

For this reason, it was necessary to create a new mold for resin-molding the battery case. Furthermore, in a battery case in which the partition 9 is provided inside the cell chamber, during overcharging, heat generated from the negative electrode plate is transferred to the partition 9 in the battery case.
Since the heat is diffused through the walls and the side walls, it tends to be difficult to transmit to the thermostat 8, resulting in weak heat sensing ability. Also,
This also has the disadvantage of increasing the cost of manufacturing the container mold, which increases the product cost.

OBJECTS OF THE INVENTION An object of the present invention is to eliminate the above-mentioned conventional drawbacks, improve the heat sensing ability of a thermostat, and provide a highly safe dense 1'IJ type lead acid battery at a low price.

Structure of the Invention The present invention provides a spacer made of a self-foamed acid-resistant resin in a sealed lead-acid battery, in which a thermostat is installed in the storage chamber of a battery case, and is installed inside the cell, and a spacer of a height or height is installed in contact with the spacer. It is characterized by the fact that a group of small electrode plates with different dimensions such as thickness are inserted into the cell to share a battery case. By configuring the battery as described above, it is possible to reduce the weight and capacity of the battery depending on the application while keeping the external dimensions the same, and also to take advantage of the heat insulating effect of the closed foam resin.
It improves heat transfer to the thermostat, ensuring battery safety.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 4 and FIG. 6, which is a sectional view taken along plane B thereof.

Note that the same components as in the conventional example are given the same reference numerals and their explanations will be omitted. In the case of this example, the electrode plate dimension width is 40 mm
This is a so-called retina type lead-acid battery, in which a positive electrode plate 1 and a negative electrode plate 2 with a height of 30 mm are separated by a separator 3 mainly made of glass fiber, and only these plates are impregnated with dilute sulfuric acid, which is an electrolytic solution. Six electrode plate groups 4 were lined up in the direction shown in FIG. 4 together with the spacer 1o and inserted into each cell chamber 6 to be used as a 12V battery. A small storage chamber for installing the thermostat 8 is provided at one end of the battery case 5, and the thermostat 8 is placed in this storage chamber so as to face the electrode plate group 4 through a partition 95'. The heat generated from the negative electrode plate can be sensed well. For the spacer 1o shown in the figure, foamed polystyrene foamed 10 to 15 times the size was used. FIG. 6 shows a cross section of another embodiment of the present invention, in which a block-shaped spacer 10 is arranged so as to face the thin electrode plate group 4. Note that the thermostat 8 faces the end face of the electrode plate group 4 with a partition 5' interposed therebetween.

Next, the battery shown in Fig. 2 is a1, and the battery shown in Fig. 3 is b1.
The battery shown in FIG. 6, which is an embodiment of the present invention, is f: C1. The battery shown in FIG. Figure 7 shows the results of overcharging. As is clear from the figure, the heat insulating effect of the non-conductor prevents or suppresses heat conduction to unnecessary parts, and the heat generated from the negative electrode plate due to overcharging can be quickly transmitted to the thermostat 8. Therefore, the deformation of the battery is prevented. It turns out that it is very effective in preventing. Furthermore, since the spacer also exhibits the effect of mitigating shock, it can also improve safety against shocks caused by falling batteries, etc. As described above, according to the present invention, the thermostat can be In a sealed lead-acid battery installed in a tank, a spacer made of independently foamed acid-resistant synthetic resin is installed in each cell chamber together with a group of electrode plates, making it possible to share the battery tank. The effect can be demonstrated.

Furthermore, mold investment and mold production JIJ for new battery cases
Since no space between I is required, it is possible to obtain an excellent effect of being able to provide inexpensive batteries in a short period of time.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional sealed lead-acid battery. . . ,circle. 1□, 431, etc. A sectional view showing another sealed lead acid battery, FIG. 4 is a perspective view of a sealed lead acid battery according to an embodiment of the present invention, and FIG. FIG. 6 is a cross-sectional view of a battery according to another embodiment of the present invention, and FIG. 7 is a characteristic diagram showing the relationship between overcharging and temperature rise. 4...Electrode plate group, 5...Battery case, 5'...Battery case partition, 6...Cell chamber, T...Thermostat storage chamber, 8... ...Thermostat, 10
...Spacer made of independently foamed acid-resistant synthetic resin. Name of agent: Patent attorney Toshio Nakao and 1 other person @2
Figure Figure 3 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A sealed lead-acid battery with a thermostat installed in a storage chamber in the battery case, in which a spacer made of independently foamed acid-resistant synthetic resin is installed in each cell chamber of the battery case in contact with a group of small electrode plates. A sealed lead-acid battery, characterized in that the thermostat (a) is opposed to the k electrode plate group through a partition of a battery case.