JPH044360Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to improvements in lead-acid batteries used in power generation systems that utilize natural energy such as solar power generation and wind power generation.

Conventional technology and its problems Lead-acid batteries for power generation systems using natural energy are used to charge and store electricity obtained through power generation into lead-acid batteries, and discharge it as necessary to adjust the balance of electricity supply and demand. However, the amount of power generated varies greatly depending on the weather and meteorological conditions, and lead-acid batteries may have to be used for long periods in an incompletely charged state. In addition, in order to store the electricity obtained from power generation with as little waste as possible, it is necessary to always leave room for charging the lead-acid battery, and in this respect it is preferable that the lead-acid battery does not reach a fully charged state. Due to their design, lead-acid batteries are forced to be used in a somewhat incomplete state of charge.

However, when used in this manner, inert lead sulfate increases in the active material under the cathode plate of the lead acid battery, making it easy for the active material to fall off. In particular, the cathode plates located at both ends of the electrode plate group deteriorate severely because only the inner surface faces the anode plate.
The capacity of the storage battery decreased, and the active material that fell off caused an internal short circuit, shortening the life of the storage battery.

Purpose of the invention The present invention has been devised in view of the conventional problems described above, and its purpose is to provide a lead-acid battery with stable quality and long life, which reduces deterioration of the lead-acid battery.

Composition of the invention In order to achieve the above object, the present invention aims to reduce the average distance between the ossicles of the lattice bodies of the cathode plates located at both ends of the electrode plate group to the average interval of the ossicles of the lattice bodies of the inner cathode plates excluding both ends. This is a lead-acid battery characterized by having less than 4/5 of the

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of the cathode plate lattice bodies at both ends of the electrode plate group of the lead-acid battery used in the present invention. FIG. 2 is a front view of cathode plate grid bodies at both ends of an electrode plate group used in a conventional battery.

Here, 1 is the ear, 2 is the vertical ossicle, 3 is the horizontal ossicle, 4 is the main bone, and 5 is the foot.

Figures 1 and 2 show the different parts of both batteries, but there is no difference in the grid shape of the electrode plates or the number of electrode plates used, except for the cathode plates at both ends of each battery. The height and width of the cathode plates are also the same.

The number of bones and the average spacing between the bones in the lattice body shown in FIG. 2 are designed to be the same as those of the lattice body of the cathode plates located at the sides other than both ends of this electrode plate group. That is, the number of bones is 5 vertical ossicles and 10 horizontal ossicles. For this reason, the average distance between bones is large, the active material retention capacity is small, and the resistance between the lattice and the active material is also large, and as mentioned above, the active material may fall off from the cathode plate using this lattice. It's easy to happen.

On the other hand, the number of bones in the lattice body in Figure 1 is 8 vertical ossicles and 17 horizontal ossicles, which is more than the lattice body of the cathode plate except for both ends. The average distance between bones is getting shorter. As a result, the active material is held by many bones and becomes difficult to fall off. Since the electrical resistance between the lattice and the active material decreases as the number of bones increases, the generation of inactive lead sulfate in the active material is also suppressed. By increasing the number of bones in the lattice body, the active material filling volume of the electrode plate decreases by the increase in bone volume, but this electrode plate faces the anode plate on only one side and is not active. Because the material is not used as much as other cathode plates, it has little negative impact on the capacity and discharge characteristics of lead-acid batteries.

However, if you increase the number of bones in the lattice body of the electrode plates other than the ends on both sides, this negative effect will occur, and increasing the number of bones in the electrode plates more than necessary will use a large amount of lead material. The disadvantage is that the batteries are expensive. Therefore, it is better to increase the bones only in the lattice bodies of the cathode plates at both ends.

When we investigated the average distance between bones, we found that
Although there are some differences depending on the size of the electrode plates, the above-mentioned improvement effect is clearly seen unless the average spacing of the bones of the cathode plate grids at both ends is 4/5 or less on the other cathode plates. Since it does not appear in , it needs to be 4/5 or lower.

As an example of a lead-acid battery for a power generation system utilizing natural energy according to the present invention, a battery was created using the lattice structure shown in Fig. 1 on the cathode plates at both ends of the electrode plate group, and the cathode plates at the same positions in the electrode plate group were As a result of a life test compared with a conventional battery using the lattice shown in Figure 2, the amount of active material that fell out per unit test day was approximately 1/5 of that of a conventional battery in the case of the battery of the present invention. Therefore, the lifespan was approximately twice as long.

As a result, it has become clear that the lead-acid battery for power generation systems using natural energy according to the present invention has a longer lifespan and higher reliability than conventional batteries.

Effects of the Invention As described above, the present invention has great practical value because it can provide a lead-acid battery with stable quality and long life, which reduces deterioration of the lead-acid battery.

[Brief explanation of the drawing]

FIG. 1 is a front view of the cathode plate lattice bodies at both ends of the electrode plate group of a lead-acid battery used in the present invention, and FIG. 2 is a front view of the cathode plate lattice bodies at both ends of the electrode plate group of a conventional battery. 1...ear, 2...vertical ossicles, 3...horizontal ossicles,
4... Main bones, 5... Legs.

Claims (1)

[Scope of utility model registration request] A lead characterized in that the average spacing of the ossicles in the lattice body of the cathode plate located at both ends of the electrode plate group is 4/5 or less of the average spacing of the ossicles in the lattice body of the inner cathode plate excluding both ends. Storage battery.