JPH0824039B2 - Sealed lead acid battery - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a sealed lead-acid battery.

2. Description of the Related Art Sealed lead-acid batteries generally have a structure in which a liquid-containing mat is used as a separator, and this mat is impregnated with sulfuric acid as an electrolytic solution so that there is almost no free liquid. Then, the active material ratio of the positive electrode and the negative electrode is adjusted so that oxygen gas is first generated from the positive electrode at the end of charging, and this oxygen gas reacts with the negative electrode and is absorbed and removed. Therefore, the portion of the negative electrode that has reacted with oxygen gas is in 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 closed structure is possible. Therefore, in a sealed lead-acid battery, it is important for the negative electrode to absorb the oxygen gas generated from the positive electrode. With such a reaction system, if air (oxygen) enters the inside of the battery from the outside of the battery, the reaction system will not operate normally, so a valve is provided at the junction between the inside and outside of the battery. It is configured to prevent the inflow of oxygen from the outside of the battery and to release the unreacted gas generated by overcharging to the outside of the battery to prevent the internal pressure of the battery from rising. In this way, in the closed type, the reliability of this exhaust valve is an important point. Conventionally, in such an exhaust valve structure, a flat rubber valve 9 is placed on the exhaust port 8 opened corresponding to each cell of the lid 2 covering the battery case 1 as shown in FIG. A sponge-like valve pressing mat 10 for pressing the rubber valve of No. 1 was placed on the mat, and this was fixed by a flat plate-like upper lid 4. The upper lid was fixed to a part of the lid 2 by a method such as heat welding or ultrasonic welding.

Problems to be Solved by the Invention The conventional sealed lead-acid battery is generally a 12V battery in which several cells with an output of 2V are connected in series, generally 6 cells,
Since there are a plurality of cells in this way, if each exhaust port is provided, the reliability of the sealing of each valve becomes a problem, the amount of valves or valve holding mats used increases, and the cost increases. Also proposed is a structure in which only one exhaust valve is provided, such as dilute sulfuric acid is injected into each cell and sealed to eliminate the liquid injection port, or electrolysis is applied to each cell separately from the exhaust port (exhaust valve). An injection port 8'for injecting a liquid is provided, and after injection, this injection port 8 '
A structure has been devised to seal the seal (see Fig. 5). In the case of a structure without an inlet, the time for starting energization after injection of electrolyte is regulated. That is, the battery assembly must be charged immediately after injection, and the process of charging must be linked, which is a major obstacle to operation. Further, in the structure in which the exhaust port and the injection port are separately provided, the structure is complicated and extra labor is required in the assembly process.

The present invention is intended to improve reliability and productivity in a structure in which each cell is provided with a liquid injection port and this serves as an exhaust port. A sealed lead-acid battery with an exhaust structure that has an exhaust port in each cell and a flat rubber valve, a sponge-like valve retainer plate, and an upper lid makes it easier and more reliable to complete the valve structure. The purpose of the present invention is to provide a high-priced and inexpensive exhaust structure.

Means for Solving the Problems The present invention provides a hole penetrating the partition wall of the battery case, and an exhaust port is provided corresponding to each cell in the lid that covers the battery case in which each cell is communicated by this hole, Only one of the exhaust ports has a valve structure, and the other exhaust ports are sealed. The exhaust valve structure at this time was constructed by using the injection port for injecting the electrolytic solution provided in each cell, and with a flat rubber valve, valve holding plate and upper lid, it has a simple structure. ,
It is possible to obtain a highly reliable exhaust structure with a small number of parts. Also, the injection port (exhaust port) to be sealed is a ring-shaped protrusion provided on the lower end of the upper lid or a ring-shaped protrusion provided around the injection port and the upper lid by heat welding or ultrasonic welding. Can be completely sealed.

Action The point of the present invention as described above is to use the liquid injection port (exhaust port) provided corresponding to each cell, and to exhaust the gas using the liquid injection port of one cell among a plurality of cells communicating in the battery case. The injection port (exhaust port) of the other cells that make up the structure is fixed by fixing the valve and the valve retainer plate when configuring the exhaust structure, and at the same time, is joined to the lid by thermal welding or ultrasonic welding with the upper lid and seals. It is to be completed. That is, the exhaust structure is completed, and at the same time, the liquid injection ports of unnecessary cells are sealed. Only the minimum required number of exhaust structures are provided, and each cell has a separate exhaust structure. As a result, the reliability is high and the rubber valve and the valve holding plate can be minimized.

EXAMPLES The constitution of the present invention will be described below with reference to examples.

FIG. 1 shows an embodiment of the present invention, in which 1 is a battery case and 2
The lid 3 is an electrode plate group including a liquid-impregnated mat-shaped separator, a positive electrode plate, and a negative electrode plate. 4 is the upper lid, 5 is the upper lid 4
It is a ring-shaped projection corresponding to a liquid injection port and an exhaust port (described later) provided on the lower surface of the. Reference numeral 6 is a partition wall that partitions the cells of the battery case 1, and reference numeral 7 is a through hole that is opened in the partition wall 6. Therefore, the cells are communicated by the holes 7. 8
Is a liquid injection port / exhaust port provided in the lid 2 corresponding to each cell. Reference numeral 9 is a flat rubber plate valve that constitutes the exhaust structure, and 10 is a sponge-like valve retainer (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 the lid 2 is sealed to complete the uncharged liquid-free battery. Next, the electrolytic solution is injected from the injection port 8 of each cell to form a battery case. When the formation of the battery case is completed, the flat rubber plate valve 9 is placed only on the top of one injection port 8. A sponge-like valve pressing mat is placed on this, and the upper lid 4 is joined to the lid 2. This is joined by liquid welding or airtightness at the joining portion 11 by heat welding or ultrasonic welding.

With respect to the exhaust ports other than the parts constituting the exhaust valve, the ring-shaped projection 5 provided on the lower surface of the upper lid 2 is joined to the lid at the outer periphery of the liquid injection port 8 to complete a sealed state.

The exhaust port 8 can be obtained when the pressure required by the flat rubber plate valve 9 and the sponge-like valve pressing mat 10 is fixed by the upper lid, that is, the cells penetrating between the cells. In (1), the exhaust structure is formed only at one place, and the other liquid injection ports 8 are simultaneously closed by the upper lid 3 when forming the exhaust structure. FIG. 2 is an explanatory view before joining the upper lid 3 and the lid 2 of the present invention. Further, FIG. 3 shows another embodiment of the present invention, in which the ring-shaped projection 5 for sealing the exhaust port 8 is integrally provided on the lower surface of the upper lid as shown in FIG. A ring-shaped projection 5'for sealing is integrally provided upward around the liquid port 8. The battery configuration is the same as in FIG.

The present invention eliminates the drawbacks of the conventional example shown in FIGS. 4 and 5. That is, as shown in FIG. 4, the injection port / exhaust port 8 opened in each cell was composed of a flat rubber plate valve 9 and a sponge-like valve holding mat 10. When the port) has a valve structure, the joint area with the flat rubber plate valve 9 becomes large, and it becomes difficult to control the adhesion. Further, there is a drawback that the opening / closing valve pressure of the valve is different between the case where the exhaust port of the central portion and the exhaust port of the cell at the end portion are continuous due to the shape of the rubber plate valve and the case where they are not continuous.
Further, since the flat rubber plate valve 9 and the sponge-like valve holding mat 10 are large, it takes time and labor to make an exhaust structure.

Further, in the structure in which the liquid injection port and the exhaust port are separated as in the conventional example of FIG. 5, the structure of the lid 2 becomes complicated because a separate exhaust structure must be provided, and the process of forming the exhaust structure and the injection process are performed. The productivity was extremely poor because it required the double labor of sealing the liquid mouth.
In the present invention, the flat rubber plate valve 9 and the sponge-like valve holding mat 10 may be reduced in size to form an exhaust structure for closing at least one exhaust port. The degree of control can be minimized, such as the degree of contact or the bondability with the valve, so that the reliability is greatly improved. In addition, the flat rubber plate valve 9 and the sponge-like valve holding mat 10 can be made small, which can reduce the cost, facilitates the installation and installation, and does not create an exhaust structure for each cell, so variations due to the valve shape occur. It is possible to construct an extremely reliable exhaust structure without doing so. Furthermore, regarding the sealing of the exhaust port of the cell which is not necessary for the exhaust structure, the ring-shaped protrusions provided on the upper cover 4 and the like seal the upper cover and the cover by heat welding or ultrasonic welding, and the sealing performance is extremely high. There are features.

EFFECTS OF THE INVENTION As described above, the present invention uses a flat rubber plate valve and a sponge-like valve pressing plate (mat), which are small and simple in shape, and serve as a liquid injection port and an exhaust port. Since the exhaust valve is provided only at one location, it is possible to provide a sealed lead-acid battery that is inexpensive and highly reliable.

[Brief description of drawings]

FIG. 1 is a vertical cross-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 partial vertical cross-sectional views of a main part of the battery of the present invention, and FIG. 4 is a partial vertical cross-section of a conventional battery. FIG. 5 and FIG. 5 are top views of another conventional battery. 1 ... Battery case, 2 ... Lid, 4 ... Top lid, 5,5 '... Ring-shaped protrusion, 6 ... Partition wall, 7 ... Through hole, 8 ... Liquid injection port / exhaust port, 9: Flat rubber plate valve, 10: Sponge-shaped valve retainer plate (mat).

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-62-90846 (JP, A) JP-A-62-128435 (JP, A) Actually opened 61-112571 (JP, U) Actually opened 59- 132164 (JP, U)

Claims (3)

[Claims] 1. A sealed lead-acid battery comprising a plurality of cells using a liquid-containing mat-like separator, the battery case having holes penetrating partition walls adjacent to each other of the plurality of cells, and the battery case being sealed. Each of the cells has a lid provided with an exhaust port that also serves as a liquid injection port, and an exhaust valve is installed in only one of the exhaust ports corresponding to the cells in the lid. A sealed lead-acid battery, wherein an exhaust port is sealed with a ring-shaped special portion provided on the lid or an upper lid joined to the lid. 2. The exhaust valve is composed of a flat rubber plate valve and a sponge-like valve pressing plate, and the exhaust port corresponding to each cell provided on the lid is provided with the exhaust port which is sealed. The sealed lead-acid battery according to claim 1, further comprising a ring-shaped protrusion extending upward from the upper portion or extending from the upper lid to the exhaust port portion. 3. A flat rubber plate valve and a valve retainer plate are fixed and other exhaust ports are sealed by joining the upper lid and the lid together. The sealed lead-acid battery according to the item.