JPS63158740A - Enclosed lead storage battery - Google Patents

Abstract

PURPOSE:To obtain high reliability with simple composition by disposing exhaustion ports on a cover for a battery jar wherein respective cells are communicating so that the ports correspond to the respective cells and forming only one exhaustion port in valve composition and the other exhaustion ports sealingly. CONSTITUTION:This enclosed lead storage battery is completed as a cell with no uncharged liquid by inserting a group of electrode plates 3 into cell chambers in a battery jar 1 and sealing the jar with a cover 2. Next, electrolytic solutions are injected from injection ports 8 of respective cells so as to perform battery jar formation. When the battery jar formation is finished, a rubber plate valve 9 is mounted on only an upper part of one injection port 8. Further, a spongy valve pressing plate 10 is mounted on this part so that an upper cover 4 and a cover 2 is jointed hermetically to liquid and air on joint parts 11. On the position of exhaustion ports exclusive of the port which is formed in composition of an exhaustion valve as aforementioned, ring-shaped protruding parts 5 disposed on a rear surface of the cover 2 are jointed with the cover 2 on peripheral parts of the injection ports so that sealing states are formed. When such simple parts are used to dispose the exhaustion valve only on one position where the injection port jointly functions as the exhaustion port, high reliability can be obtained with simple composition.

Description

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

Conventional sealed lead-acid batteries generally have a structure in which a liquid-impregnated mat is used as a separator, and this mat is impregnated with sulfuric acid, which is an electrolyte, so that there is almost no free liquid. Then, adjust the active material ratio of the positive and negative electrodes.

The battery is assembled so that oxygen gas is first generated from the positive electrode at the end of charging, and this oxygen gas is absorbed and removed by reacting with the negative electrode. Therefore, the part of the negative electrode that has reacted with oxygen gas enters a discharged state, and even if overcharging is performed, the negative electrode is configured so that the charging reaction and the reaction with oxygen gas occur in parallel, and hydrogen gas is not generated. By utilizing such a reaction system, a sealed structure is possible. Therefore, in a sealed lead-acid battery, it is important to have the negative electrode absorb oxygen gas generated from the positive electrode. Due to this type of reaction system, if air (oxygen) enters the battery from outside, the reaction system will not operate properly, so a valve is installed at the junction between the inside and outside of the battery. The battery is configured to prevent oxygen from flowing in from outside the battery, and to release unreacted gas generated by overcharging to the outside of the battery to prevent an increase in the internal pressure of the battery. In this way, the reliability of this exhaust valve is an important point in a closed type exhaust valve. Conventionally, in such an exhaust valve structure, as shown in FIG. A sponge-like valve-pressing mat 10 for pressing the rubber valve was placed on it, and this was fixed with a flat-plate-like upper lid 4. The upper lid was fixed to a part of the lid 2 by heat welding, ultrasonic welding, or the like.

Problems to be Solved by the Invention Conventional sealed lead-acid batteries are generally 12V batteries in which several cells with an output of 2V are connected in series, typically 6 cells. If an exhaust port is provided in the valve, the reliability of the sealing of each valve becomes a problem, and the amount of valves or valve-holding cloaks used increases, resulting in an increase in cost. In addition, structures with only one exhaust valve have been proposed, such as those in which dilute sulfuric acid is injected into each cell and then sealed to eliminate the injection port, and structures in which each cell is equipped with an electrolytic valve in a location separate from the exhaust port (exhaust valve). A liquid injection port 8' is provided for injecting the liquid, and after injection, the liquid injection port 8'
A demolition plan was devised to seal the area (see Figure 5). In the case of a structure without an injection port, the time for starting energization after injection of electrolyte is regulated.

In other words, since it must be charged immediately after injection, the battery assembly and charging processes must be linked.
This was a major operational impediment. Furthermore, in a structure in which an exhaust port and an inlet are provided separately, the structure is complicated and requires extra effort to complete.

The present invention aims to improve reliability and productivity in a structure in which a liquid injection port is provided in each cell and this serves as an exhaust port. In sealed lead-acid batteries, each cell has an exhaust port and the exhaust structure consists of a flat rubber valve, a sponge-like valve holding plate, and an upper lid. The purpose of this invention is to provide an inexpensive exhaust structure with high efficiency.

Means for Solving the Problems The present invention provides a hole through the partition wall of the battery case, and provides an exhaust port corresponding to each cell in the lid covering the battery case through which each cell communicates. Only one of the exhaust ports is provided with a valve structure, and the other exhaust ports are sealed.

The exhaust valve structure used in this case was constructed using the injection port for injecting the electrolyte provided in each cell, and was simple with a flat rubber valve, a valve holding plate, and an upper lid. It is possible to obtain a highly reliable exhaust structure with a small number of parts. The liquid injection port (exhaust port) to be sealed is either a ring-shaped protrusion provided at the lower end of the top lid, or a ring-shaped protrusion provided around the liquid injection port and the top lid are sealed using a hot melt layer or ultrasonic waves. It can be completely sealed by welding.

Function The key point of the present invention is to utilize the liquid inlet (exhaust port) provided corresponding to each cell, and use the inlet of one cell among the plurality of cells connected in the battery case to exhaust air. The liquid injection ports (exhaust ports) of the other cells that make up the structure are sealed by joining them to the lid by heat welding or ultrasonic welding at the same time as fixing the valve and valve holding plate when configuring the exhaust structure. It is something to be completed. In other words, it completes the exhaust structure and at the same time seals the injection ports of cells that are not needed.It only has the minimum number of exhaust structures required, compared to a system that has an individual exhaust structure for each cell. This ensures high reliability and minimizes the need for rubber valves and valve retainers.

Example The present invention will be explained in detail below with reference to Examples.

FIG. 1 shows an embodiment of the present invention, in which 1 is a battery case, 2 is a lid, and 3 is an electrode plate group consisting of a liquid-impregnated mat separator, a positive electrode plate, and a negative electrode plate. 4 is an upper lid, and 5 is a ring-shaped protrusion corresponding to a liquid inlet/exhaust port (described later) provided on the lower surface of the upper lid 4.

Reference numeral 6 indicates a partition wall that partitions each cell of the battery case 1, and reference numeral 7 indicates a through hole opening in the partition wall 6.

Therefore, each cell communicates with each other through the hole 7. Reference numeral 8 denotes a liquid injection port and exhaust port provided in the lid 2 corresponding to each cell. 9
1 is a flat rubber plate valve constituting the exhaust structure, and 1o is a sponge-like valve holding plate (mat) that pressurizes the rubber plate valve 9.

In the sealed lead-acid battery of the present invention, the electrode plate group 3 is inserted into the cell chamber of the battery case 2, and then sealed with the lid 2 to complete an uncharged, liquid-free battery. Next, an electrolytic solution is injected from the inlet 8 of each cell to perform battery cell formation. When the cell formation is completed, a flat rubber plate valve 9 is placed only above one liquid injection port 8. A sponge-like valve holding mat is placed on top of this, and the upper lid 4 is joined to the lid 2. For this purpose, the bonding portion 11 is bonded liquid-tightly and airtightly by thermal welding or ultrasonic welding.

For exhaust ports other than those that constitute the exhaust valve, use the upper lid 2.
A ring-shaped protrusion 6 provided on the lower surface of the liquid inlet 8 is joined to the lid at the outer periphery of the liquid inlet 8 to create a complete seal.

In addition, the exhaust port 8 can obtain the necessary pressure by means of a flat rubber plate valve 9 and a sponge-like valve holding mat 10 when it is fixed by the upper lid. In this case, the exhaust structure is constructed at only one location, and the other liquid inlet 8 is sealed by the upper lid 3 at the same time when the exhaust structure is constructed. FIG. 2 is an explanatory diagram of the upper lid 3 and the lid 2 of the present invention before they are joined. Furthermore, FIG. 3 shows another embodiment of the present invention, in which the ring-shaped projection 6 for sealing the exhaust port 8 is provided integrally on the lower surface of the upper lid as shown in FIG. A ring-shaped projection 6' for sealing is integrally provided upward around the liquid port 8. The battery configuration is the same as that shown in FIG. 4.

The present invention eliminates the drawbacks of the conventional examples shown in FIGS. 4 and 6. First, as shown in Fig. 4, the liquid inlet/exhaust port 8 opened in each cell was constructed with a flat rubber plate valve 9 and a sponge-like valve holding mat 10. If the opening) is made into a valve structure, the joint area with the flat rubber plate valve 9 will be large, and it will be difficult to control the adhesion.

Further, there is a drawback that there is a difference in the opening/closing pressure of the valve depending on the shape of the rubber plate valve, depending on the shape of the rubber plate valve, depending on the shape of the rubber plate valve, and depending on the shape of the rubber plate valve, there is a difference in the opening/closing pressure of the valve. Furthermore, since the flat rubber plate valve 9 and the sponge-like valve holding mat 1o are large, it takes time and effort to make the exhaust structure and increases the cost.

In a structure in which the liquid injection port and the exhaust port are separated, as in the conventional example shown in Fig. 5, a separate exhaust structure must be provided, which complicates the structure of the lid 2. This required the double effort of sealing the mouth, which was extremely unproductive. In the present invention, it is only necessary to reduce the size of the flat rubber plate valve 9 and the sponge-like valve holding mat 10, and to create an exhaust structure that blocks at least one exhaust port. Since the control of the degree of connection with the valve and the like can be minimized, reliability is greatly improved. Furthermore, the fact that the flat rubber plate valve 9 and the sponge-like valve holding mat 10 can be made smaller also reduces costs, making installation easier, and since an exhaust structure is not created for each cell, variations occur depending on the valve shape. It is possible to construct an extremely reliable exhaust structure without having to Furthermore, regarding the sealing of the cell exhaust port, which is not necessary for the exhaust structure, the upper lid and the lid are sealed by heat welding or ultrasonic welding using a ring-shaped protrusion provided on the upper lid 4, etc., so the sealing performance is extremely high. It has the advantage of being expensive.

Effects of the Invention As described above, the present invention uses small and simple parts such as a flat rubber plate valve and a sponge-like valve holding plate (mat), and uses a single location that serves as both a liquid injection port and an exhaust port. This device has an exhaust valve installed in the exhaust valve, and has a simple structure with extremely high reliability.As lead-acid batteries become more and more sealed, the value of creating a highly reliable sealed exhaust structure is significant.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a main part of a sealed lead-acid battery according to an embodiment of the present invention, FIGS. 2 and 3 are longitudinal sectional views of a main part of a battery of the present invention, and FIG. 4 is a partial longitudinal sectional view of a conventional battery. FIG. 6 is a top view of another conventional battery. 1...Battery case, 2...Lid, 4...
...Top lid, 6゜5'...Ring-shaped protrusion, 6.
...Inner partition wall, 7...Through hole, 8...
... Liquid injection port and exhaust port, 9 ... Flat rubber plate valve, 10 ... Sponge-like valve holding plate (mat). Name of agent: Patent attorney Toshi Nakao and one other person? - Lid 3 - Polar liquid group 4 - Upper part; Cup opening 8 - Liquid injection port (10 9 - Flat rubber tube 10 - Sponge-like patent plate 4 - 3.r; Fig. 3 S'-
Ring 1 Missing Raise 1 - Battery container 2 - Cap 4 - Top lid 4 Figure 8 - Liquid injection port and exhaust port 9 - Hand-blown rubber valve 10 - Striped valve holder

Claims (3)

[Claims] (1) In a sealed lead-acid battery using a liquid-containing matte separator, a battery case is provided that has holes penetrating the partition walls of multiple cells, and this battery case is sealed and an exhaust port is provided corresponding to each cell. It has a top lid, and an exhaust valve is installed at only one of the exhaust ports corresponding to multiple cells of the lid, and the other exhaust ports are sealed with the top lid when configuring the exhaust structure. A sealed lead-acid battery. (2) The exhaust valve has a flat rubber plate valve and a sponge-like valve holding plate, and a ring extending upward is attached to the portion of the exhaust port that is sealed among the exhaust ports corresponding to each cell provided on the lid. The sealed lead-acid battery according to claim 1, characterized in that a ring-shaped projection is provided at the lower end of the upper lid for sealing the exhaust port. (3) A patent characterized in that when configuring the exhaust structure, the upper lid fixes the flat rubber plate valve and the valve holding plate that holds it, and simultaneously seals the exhaust port provided in the lid. A sealed lead-acid battery according to claim 1.