JPS62243262A - Lead-acid battery - Google Patents

Abstract

PURPOSE:To uniformly compress a plate group between cells by accommodating a plate group body obtained by accommodating a plate group in a flexible bag in an empty box-like container. CONSTITUTION:A cathode plate 2 is covered with a U-shaped separator 1 comprising nonwoven fabric made of glass or the like, and anode plates 3 are placed on its both sides to make a plate group 6. The plate group 6 is accommodated into a flexible bag 7 to make a plate group body 8. The plate group bodies 8 are accommodated in a container 9. Thereby, compression of the plate group between cells is made uniform.

Description

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

Conventional technology Conventionally, the electrolyte in sealed lead-acid batteries is

Non-woven fabric such as glass fiber called retainer,
It is held in a woven fabric and a plate. In this case, if the contact between the electrode plates and the retainer is not tight, the contact resistance will increase and the internal resistance of the battery will increase.

Therefore, during discharging, the IR loss is large and the voltage drops significantly, reducing the capacity. This causes a decrease in capacity (to suppress an increase in internal resistance).

As a general method conventionally used, pressurizing the electrode plate group has been shortened.

Problems that the invention is trying to solve Sealed lead-acid batteries are cathode gas absorption type, and oxygen generated from the anode plate is absorbed by the cathode plate and returns to water, so oxygen is not released to the outside of the battery. I'm at t°C. but,
At the end of the charging/discharging cycle or during floating charging, 1004 is not absorbed by the cathode plate, but a small amount of oxygen gas is released. Along with this oxygen gas, water vapor is also released.

Furthermore, as mentioned above, in sealed lead-acid batteries, a non-woven fabric such as glass fiber is used as the separator 1, but since non-woven fabric is somewhat rigid even in a wet state, the electrode plates produced by the current paste filling method Due to variations in thickness and smoothness, pack rings, etc., contact between the electrode plate and the nonwoven fabric may become insufficient. Therefore, by applying pressure to the electrode plate group, the electrode plate and separator 1
The contact is stabilized. However, since the pressure applied to the electrode plate group is adjusted for each cell, variations in the pressure applied from cell to cell may result in unequal contact between the electrode plate and the separator l in cells with low pressure. be. In that case, even if the electrolyte in the separator 1 decreases slightly, the contact resistance between the electrode plate and the separator 1 will increase extremely, increasing the internal resistance of the battery and causing an early capacity drop, or in extreme cases. had the disadvantage of causing initial capacity variations.

In addition, 2 is an anode plate, 3 is a cathode plate, 4 is a battery tank, and 5 is a partition.

Means for Solving the Problems The present invention is intended to eliminate the above-mentioned drawbacks, and the electrode plate group is housed in a flexible bag, and the electrode plate group is housed in an empty box-like container.

action The pressure on the electrode plates between cells becomes uniform.

Embodiment FIG. 1 shows one anode plate 2, two cathode plates 3, and an anode plate 2 separated by a separator l made of a non-woven fabric such as glass, which serves to hold the electrolyte and isolate the electrode plates. An electrode plate group 8 is shown in which the electrode plate group 6 is wound into a letter shape and is housed in a flexible bag 7. FIG. 2 shows a state in which the electrode plate assembly 8 is housed in a monoblock battery case 9.

As shown in FIG. 1, cells are isolated by housing the electrode plate group 6 in a bag 7. In addition, by storing the electrode plate group 8 in the state stored in the bag body 7 in the battery case 9I,
Group pressure between cells can be made uniform. Current paste filling methods and chemical formation methods must allow some variation in electrode plate thickness, unevenness, buckling, etc.

Next, the distribution of the electrolytic solution in the electrode plate group 6 is determined when the 10 hour rate capacity is 1.
An example of a battery of about 8 Ah (6M1.8 type) is shown in Figure 4. The maximum amount of electrolyte that this electrode plate group l can contain is L
7.5m, 13. When fluid loss occurs, v! As is clear from Figure IE4, the liquid content of the anode plate 2 and cathode plate 3 did not change, but the electrolyte inside the separator decreased and went to °C. This is due to the difference in the pore size of the active materials of the anode plate 2 and cathode plate 3 and the pore size of the separator 1, and is because the electrolyte in the separator 1, which has a large capillary diameter, has decreased.

In the present invention, since the pressure applied to the electrode plate group 6 between cells is uniform, variations in capacity between cells due to variations in pressure are reduced, so that the life can be improved.

In consideration of acid resistance, oxidation resistance, flexibility, cost, etc., it is preferable for the bag body 7 to employ a film made of polyethylene, polypropylene, or the like. Also.

Using a bag body 7 such as a hisstube, after housing the electrode plate group 6, the bag body 7 is brought into close contact with the electrode plate, making the handling of the extraction process easier.

Since the battery case 9 does not have a partition wall, it has a simple structure,
This made molding the battery case easier and improved dimensional accuracy.

Lead-acid battery A according to the present invention and conventional lead-acid battery B (both 6
M1.8 type) was manufactured by a conventional method, and the voltage was 4°”C, 6,8V.
Figure 5 shows the results of a continuous constant voltage overcharge test (capacity was confirmed by discharging with a 1 hour rate current), and as is clear from this, conventional lead-acid battery B was While the capacity decreased after about 1 year, lead-acid battery A according to the present invention had an excellent capacity of about 1.5 years.

Effects of the Invention As described above, according to the present invention, the contact between the electrode plate and the separator can be stabilized, the amount of electrolyte is reduced, the internal resistance of the battery is suppressed, and an excellent battery life can be obtained. Since the shape of the container is simple, it has great industrial value, such as improved dimensional accuracy and reduced cost.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the electrode plate group used in the present invention, Fig. 2 is a partially cutaway schematic diagram showing an embodiment of the lead-acid battery of the present invention, and Fig. 3 is a perspective view showing an example of the electrode plate group used in the present invention. Fig. 4 is a characteristic diagram of the results of a constant voltage life test of lead-acid battery A of the present invention and conventional lead-acid battery B, and Fig. 51i2I is a partially cutaway schematic diagram of a conventional lead-acid battery. It is. ! is a separator, 2 is an anode plate, 3 is a cathode plate, 6 is a group of electrode plates, 7
1 is the bag, 8 is the electrode plate group, and 9 is the battery case.
Figure 2 Figure 3 2M2 Yoko (vJl) Figure 4 Figure 4

Claims (1)

[Claims] A lead-acid battery characterized in that an electrode plate group consisting of an anode plate, a cathode plate, and a separator having a liquid-retaining property is housed in a flexible bag, and the plate group is housed in a container formed in the shape of an empty box. .