JPH04144073A - Sealed type storage battery - Google Patents

Abstract

PURPOSE:To construct a thin type sealed storage battery whose high rate discharge capacity is free from deterioration by installing a pos. and a neg. electrode adjoiningly on one plane, with an electrolyte retainer interposed, and combining the active substance and electrolyte retainer with projections/recesses provided in the thickness direction one another. CONSTITUTION:A comb-shaped lead foil is adhered to a film 1 of polypropylene using epoxy type adhesive, and arrangement is made on one plane as a pos. electrode electricity collector and a neg. electrode electricity collector 3. After an electrolyte retainer 4 is provided by means of printing between the pos. and neg. electricity collectors 2, 3, followed by drying, a pos. electrode active substance 5 and a neg. electrode active substance 6 are printed on the electricity collectors 2, 3 and dried. The electrolyte retainer 4 is dislocated to a certain degree horizontally from the previous printing, and printed and dried. Further the pos. and neg. active substances 5, 6 are a little dislocated in the same manner, and printed and dried. Repetitions of procedures in this manner allow combining of the active substances 5, 6 and electrolyte retainer 4 with projections/recesses provided in the thickness direction with one another.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a thin sealed storage battery.

[Conventional technology]

In general, a sealed storage battery has a structure in which one or more of a positive electrode plate, a separator, and a negative electrode plate are sequentially laminated and placed in a case, and an electrolyte is injected into the case.

Recently, as devices using sealed storage batteries have become smaller, there has been a strong demand for thinner sealed storage batteries, and a structure in which positive and negative electrode plates are arranged on the same plane china clay has been proposed. has been done.

[Problem to be solved by the invention]

When a positive electrode plate and a negative electrode plate are placed adjacent to each other on the same plane with an electrolyte holder in between, the contact area between the electrolyte and the electrode plate active material becomes extremely small, increasing the internal resistance of the battery and causing high rate discharge. It has the disadvantage of a small capacity, and also has the disadvantage that the electrode plates and the electrolyte holder tend to separate during handling, resulting in a decrease in capacity.

[Means and Effects for Solving the Problems J The present invention eliminates the above-mentioned drawbacks, in that the positive electrode and the negative electrode are arranged adjacently on the same plane via the electrolyte holder, and the active material and the electrolyte holder are arranged adjacent to each other on the same plane. are combined with unevenness in the thickness direction, increasing the contact area between the active material and the electrolyte,
The internal resistance of the battery decreases, the high rate discharge capacity increases, and even if the battery is bent, the active material and electrolyte holder will not separate, so there will be no capacity deterioration. This is what I did.

〔Example〕

An embodiment of the present invention will be described.

As shown in FIGS. 1 and 2, a polypropylene film 1 with a thickness of 0.1 ram is coated by comb printing with a thickness of 0.11 ram, and after drying, a diatomaceous film is placed on each current collector 2°3. It will match the soil powder paste that was printed last time. Next, create, wash, and dry.
The whole was covered with another film 1, and the peripheries of the films 1 were welded, leaving some unwelded parts.

After welding, inject a predetermined amount of electrolyte into the unwelded part,
Next, oil was injected into the unwelded part to form a safety valve part.

In addition, for comparative study, as shown in Figure 3, each electrode active material 5
, 6 and the electrolyte holder 4 have a flat cross section with no unevenness in the depth direction, and a conventional sealed lead acid battery was manufactured. As a result of the test, FIG. 4 shows the high rate discharge characteristics of the product of the present invention and the conventional product under IC constant current. It can be seen that the product of the present invention has an approximately 50% improvement in duration compared to the conventional product.

Furthermore, as shown in FIG. 5, a similar high-rate discharge test was conducted with the sealed lead-acid battery bent at an angle of 20 degrees from the center in the thickness direction. The results are shown in Figure 6. A comparison with FIG. 4 shows that the discharge duration of the conventional product is halved, but the product of the present invention has almost no effect. [Effects of the Invention] As described above, the present invention has the advantage that the active material and the electrolyte holder are By combining them with unevenness in the thickness direction, it is possible to provide a thin sealed storage battery that is resistant to bending and does not deteriorate in high rate discharge capacity, and has great industrial value.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is a sectional view showing a conventional sealed lead acid battery, and Fig. 4. 5 is an explanatory diagram showing a state in which a sealed lead-acid battery is bent in the thickness direction. FIG. 6 is a diagram of a high rate discharge characteristic curve in a bent state. It is. DESCRIPTION OF SYMBOLS 1... Film, 2... Positive electrode current collector, 3... Negative electrode current collector, 4... Electrolyte holder, 5... Positive electrode active material,
6... Negative electrode active material. Figure 1 Figure 2 Section 3 Figure 4 Discharge duration (8) Figure 6 Discharge duration (minutes)

Claims (1)

[Claims] 1. A sealed storage battery characterized in that a positive electrode and a negative electrode are arranged adjacent to each other on the same plane with an electrolyte holder interposed therebetween, and the active material and the electrolyte holder are combined with unevenness in the thickness direction.