JPH0619983B2 - Sealed lead acid battery - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sealed lead acid battery.

(Prior Art) Conventionally, in a sealed lead-acid battery, when assembling a negative electrode and a positive electrode in which an active material is applied to an electrode substrate, both electrodes are kept at a constant interval and an electrolytic solution is spread to the electrodes. In general, a glass mat is interposed between both electrodes as a separator.

(Problems to be solved by the invention) However, since the glass mat used for the separator of the above sealed lead-acid battery tends to contract in thickness when absorbing the electrolyte, a relatively thick glass mat is inserted between the electrodes. Even when the electrode is assembled in a compressed state and mounted in the cell, it is not possible to sufficiently prevent the formation of a gap between the electrode and the glass mat due to the contraction of the glass mat, and the glass mat becomes the active material applied to the electrode substrate. However, it does not have a uniform adhesion. Therefore, there are drawbacks such as the drop of the active material from the electrode substrate and the fact that the electrolyte does not spread uniformly over the active material, which leads to a decrease in battery capacity or a shortened battery life due to a decrease in gas absorption state. There has been a demand for the development of a sealed lead-acid battery that can maintain sufficient adhesion between the active material and the electrolyte and spread the electrolyte uniformly.

(Means for Solving the Problem) In view of the present situation, the present invention maintains sufficient adhesion between the electrode substrate and the glass mat to uniformly spread the electrolytic solution to the active material and reduce the battery capacity. The purpose of the present invention is to provide a sealed lead-acid battery with a long life, in which a glass mat is polymerized in a digging state on the surface of the active material applied to the electrode substrate, and a plurality of them are polymerized on the electrode substrate. It is characterized by placing glass mats in contact with each other and arranging them side by side inside the battery case.

In the above-mentioned arrangement, the glass mats polymerized on the electrode substrate may be directly brought into contact with each other, or the same as the glass mat polymerized on the electrode substrate at the facing intervals of the glass mats polymerized on the electrode substrate. The battery capacity may be adjusted by interposing a fine fiber glass mat of the material.

(Example) The present invention will be described with reference to an example shown in the drawings.

FIG. 1 is a cutaway side view showing an embodiment of the present invention, FIG. 2 is a side view of an example of an electrode substrate on which a glass mat is polymerized, and FIG. 3 is a cutaway enlarged view of part A in FIG. 2; FIG. 6 is a cutaway side view showing another embodiment of the present invention.

In the figure, reference numeral 1 denotes an electrode substrate, which is of a flat shape or a grid shape made of, for example, a lead material or a lead alloy material. Reference numeral 2 denotes an active material, which is a lead oxide material for an anode and a sponge lead material for a cathode, for example. The active material 2 is applied to each electrode substrate 1. Reference numeral 3 denotes a glass mat, for example, a thin fiber having a diameter of 0.5 to 5 μm obtained by melt-spinning an alkali glass having an excellent acid resistance and having a thickness of 0.2 to 0.2 so as not to be unraveled by overlapping with each other. A 4 mm porous sheet was formed so that the electrolyte solution could easily permeate, and the surface of the active material 2 was polymerized in a bite state.

In order to polymerize the glass mat 3 with the active material 2 applied to the electrolytic substrate 1, the paste-like active material 2 is applied to the electrode substrate 1, and the glass mat 3 is pressed and stuck while the active material 2 is soft. Subsequently, the glass mat 3 is polymerized so as to bite into the active material 2 by performing drying and chemical conversion treatment on these.

In the embodiment shown in the first drawing, the anode 5 having the above-mentioned structure is used.
The glass mat 3 of No. 3 and the glass mat 3 of the cathode 6 were brought into direct contact with each other and arranged side by side in the cell 4.

As described above, the glass mat 3 is polymerized in a state of digging into the surface of the active material 2 applied to the electrode substrate 1. Therefore, even if the glass mat 3 absorbs the electrolytic solution and contracts, the glass mat 3 is detached from the electrode substrate 1. Since the glass mat 3 can be maintained in a sufficiently pressed and adhered state with respect to the electrode substrates 1, the active material 2 applied to both electrode substrates 1 can be maintained.
On the other hand, the electrolytic solution impregnated in the glass mat 3 is always spread uniformly, the gas absorption state is improved, the decrease in battery capacity is prevented, and the life is extended.

In the embodiment shown in FIG. 4, the battery capacity is adjusted by interposing a fine fiber glass mat 7 made of the same material as the glass mat 3 at each facing interval between the glass mat 3 of the anode 5 and the glass mat 3 of the cathode 6. .

The glass mat 7 interposed between the glass mat 3 of the anode 5 and the glass mat 3 of the cathode 6 is the glass mat 3
Since the glass mats are entangled with each other at their interfaces, they do not separate from each other even if these glass mats absorb the electrolyte and contract.

Further, since the glass mat 3 is polymerized with the active material 2 applied to the electrode substrate 1, it is sufficient to simply arrange the glass mat 3 side by side in the cell 4 so that the battery can be easily manufactured and assembled.

(Effects of the Invention) As described above, according to the present invention, the glass mat is polymerized in such a manner that the glass mat is eroded on the surface of the active material applied to the electrode substrate, and a plurality of the glass mats polymerized on the electrode substrate are brought into contact with each other. Since the glass mats are arranged side by side inside the cell, they do not separate from the electrode substrate even if the glass mat contracts, and therefore sufficient adhesion is obtained between the electrode substrate and the glass mat, and The impregnated electrolytic solution spreads evenly over the active material, which makes the gas absorption state good and prevents the decrease in battery capacity, prolongs the service life, and makes it easy to manufacture and assemble the battery and adjust the battery capacity. And so on.

[Brief description of drawings]

FIG. 1 is a cutaway side view showing an embodiment of the present invention, FIG. 2 is a side view of an example of an electrode substrate on which a glass mat is polymerized, and FIG. 3 is a cutaway enlarged view of part A in FIG. 2; FIG. 6 is a cutaway side view showing another embodiment of the present invention. 1 ... Electrode substrate, 2 ... Active material, 3 ... Glass mat, 4 ... Electricity

Claims (1)

[Claims] 1. A glass mat is superposed on the surface of an active material applied to an electrode substrate, and a plurality of the glass mats are superposed on the electrode substrate, and the glass mats are brought into contact with each other and arranged side by side in the cell. A sealed lead acid battery characterized by the above.