JP2000331662A - Retainer type monoblock battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the clogging of an explosion-protection filter to suppress the damage of an exhaust cylinder or exhaust valve as much as possible in the explosion of a battery by providing an exhaust passage communicating with the exhaust cylinder extending from a lid to the upper part of a battery jar, and forming a gas discharge port having the explosion-protection filter on one end of the exhaust passage in the upper part of the battery jar. SOLUTION: An upper surface upper lid 18 is put on the upper surface intermediate lid 17 of a battery jar, and an exhaust passage 22 communicating with a hole 21 is formed between them. A circular small chamber 24 communicating with a pair of discharge ports 23 formed on the side surface of the upper lid 18 is provided at the end of the exhaust passage 22, and an explosion-protection filter 25 is fitted thereto. Accordingly, the exhaust gas guided in the exhaust passage 22 is guided to the discharge port 23 through the explosion-protection filter 25 and discharged to the outside. According to this structure, since the explosion-protection filter 25 is located in the position distant from the exhaust cylinder of each cell on the side surface of the battery jar as far as possible, and also on the upper part of the batter jar, acid mist can be prevented from condensing in the middle of the exhaust passage 22 and reaching the explosion-protection filter 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retainer type monoblock battery, and more particularly to an exhaust structure of the battery.

[0002]

2. Description of the Related Art A battery used as a power source of an automobile is usually a monoblock battery in which a plurality of cells (cells) are assembled and integrated. The monoblock battery generally includes a rectangular resin container, a plurality of cell chambers formed by partitioning the inside of the container using resin partition walls, and a pole group disposed in each of the cell chambers. Have. Here, the electrode group disposed in each cell chamber is formed by laminating a positive electrode plate and a negative electrode plate via a separator, and electrode plates having the same polarity are connected at a connection portion, and the connection portion is connected to an adjacent cell. The electrode group of the chamber is connected to each other between the cells, and is connected to a pair of a positive electrode terminal and a negative electrode terminal arranged above the battery case. In addition, each cell chamber has an exhaust part having an exhaust valve mounted on the upper part of the battery case.
The exhaust unit is for exhausting flammable gas (for example, hydrogen gas) generated in the cell chamber during the charging process of the monoblock battery.

[0003] As such a monoblock battery, a retainer type battery that does not require water refilling is known.
In this retainer type monoblock battery, the electrode groups arranged in each cell chamber are arranged alternately with a plurality of positive plates and negative plates standing upright with a separator holding an electrolyte interposed therebetween. However, in this case, since the separator is placed in the cell chamber in a state of standing upright like the positive electrode plate and the negative electrode plate, a phenomenon in which the concentration of the electrolytic solution held there occurs in the upper and lower parts, that is, a stratification phenomenon Easily occur. As a result, it is difficult for such a retainer type monoblock battery to achieve high rate discharge characteristics, and the battery life is short.

In order to solve such a problem, a retainer type monobloc battery in which the electrode group is rotated by 90 degrees and accommodated in the cell chamber so that the working surfaces of the positive electrode plate and the negative electrode plate become horizontal is proposed. Have been. In such a battery, the connection portion is located on the side surface of the electrode group, and the electrode plate and the separator are stacked so as to be horizontal.
It is more advantageous to provide an opening on the side of the battery case and to house the electrode group from this opening. Therefore, the battery case has an opening surface on a side surface, and the opening surface is partitioned by a partition wall to form a plurality of cell chambers. Then, a lid is attached to the opening surface, and the exhaust portion communicating with each cell chamber is attached to the lid. However, if the exhaust port at one end of the exhaust section that contacts the outside air is on the side of the battery case, the liquid leaks easily, and if there is an external device or container on the side of the battery, it is difficult to exhaust. is there. Therefore, the exhaust portion is configured to reach from an exhaust pipe of each cell on the side surface of the battery case to an exhaust port formed in an upper portion of the battery case through an exhaust passage. The exhaust valve is attached so as to cover the opening surface of the exhaust pipe, and an explosion-proof filter is arranged near the exhaust valve. The role of this explosion-proof filter is to prevent the gas in each cell chamber from igniting from outside and exploding.

[0005]

However, since this explosion-proof filter is provided for each cell, there is a problem that it takes a long time to mount the filter and the material cost is high. In addition, since this filter is close to the exhaust valve mounted on the exhaust stack, when the gas generated in the cell chamber during charging of the battery becomes higher than the exhaust valve opening pressure and is discharged to the exhaust passage. The acid fog contained in the gas adhered to the filter, clogged the filter, and reduced or lost the gas discharge function. The gas concentration in the cell chamber increased, and the risk of explosion damage increased. In order to solve such a problem, for example, in a conventional control valve type battery in which an electrode plate is upright, an explosion-proof filter is not provided for each cell, and gas in each cell chamber is collectively collected in an exhaust passage. There has been proposed a structure in which an explosion-proof filter is provided near an exhaust port of an exhaust passage. However, in this exhaust structure, an explosion-proof filter is attached to the lid that covers the exhaust pipe and the exhaust valve, and the distance of the exhaust path from the exhaust pipe to the filter is short, and the exhaust path is on the same plane. Clogging could not be eliminated. In addition, when the battery exploded, damage to the exhaust pipe and the exhaust valve near the filter could not be avoided, and the damage to the filter alone could not be achieved.

Therefore, the present invention prevents the explosion-proof filter from being clogged in a battery having a collective exhaust structure.
The purpose is to minimize the damage to the exhaust stack and exhaust valve when the battery explodes.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to the present invention, wherein a side wall of a battery case is opened, and the inside of the battery case is divided into a plurality of cell chambers by partition walls dividing the opening surface. In a retainer-type monoblock battery in which the electrode group is housed so that the working surface of the electrode plate is horizontal in the chamber, and a lid having an exhaust pipe communicating with the cell chamber is attached to the opening face, An exhaust passage communicating with the lid is provided from the lid to the upper portion of the battery case, and a gas outlet having an explosion-proof filter is formed at one end of the exhaust passage at the upper portion of the battery case.

[0008]

According to the above-mentioned means, the explosion-proof filter is located at a position as far as possible from the exhaust pipe of each cell on the side of the battery case, and since it is located above the battery case, acid fog is condensed in the middle of the exhaust passage. Never reach the explosion-proof filter.
Therefore, clogging of the explosion-proof filter can be prevented. In addition, even if the exhaust gas ignites and explodes, the damage to the battery case is stopped near the explosion-proof filter, so the damage to the exhaust stack can be prevented,
It is possible to prevent a flash explosion of the gas in the cell chamber and to maintain the sealed function of the battery.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded view of an embodiment of the present invention as viewed from the side of an opening of a battery case, and a side lid 1 is attached to the opening. 2 is a plan view from the top of FIG. 1, FIG. 3 is a cross-sectional view taken along the line AA ′ of FIG. 2, FIG. 4 is a side view of the battery of FIG. 1 with the top cover and the side cover removed. 5 is a cross-sectional view showing a middle cover and a top cover for the side surface.

As shown in FIG. 4, the battery case 2 according to the present invention is formed of a rectangular parallelepiped with one of its side surfaces opened, and this opening surface is partitioned by the partition walls 3 to form a plurality of cell chambers 4a to 4f. . In the present embodiment, six cell chambers 4a to 4f are formed by two rows of partition walls 3 in the vertical direction and one row of partition walls 3 in the horizontal direction.
Are formed. In each of the cell chambers 4a to 4f, an electrode group 5 stacked with a separator made of a glass mat sandwiched between a positive electrode plate and a negative electrode plate is accommodated such that the working surface of the electrode plate is horizontal. In the electrode group 5, a positive electrode strap 6 connecting the positive electrode plates to each other and a negative electrode strap 7 connecting the negative electrode plates to each other are formed at the opening surface of the battery case. It is standing up.

As shown in FIG. 1, a side cover 1 is attached to the opening surface of the battery case 2. The intermediate terminals 8 and 9 having different polarities of adjacent cell chambers outside the inner lid 1 are connected to each other by a connection body 10, and the pole group 5 of each cell chamber is connected in series. The intermediate terminal 8 of the positive electrode serving as one end of the series connection and the intermediate terminal 9 of the negative electrode serving as the other end are, for example, shown in FIG.
Then, the positive electrode intermediate terminal 8 of the cell chamber 4b and the negative electrode intermediate terminal 9 of the cell chamber 4c are connected to connectors 11, 12 extending from the outside of the inner lid 1 (front side in the drawing) to the upper part of the battery case 2. Have been. Further, an exhaust pipe 13 is formed in the inner lid 1 corresponding to each of the cell chambers 4a to 4f as shown in FIG.
The exhaust pipe 13 has an exhaust valve 14 mounted on the opposite side (upper side in the drawing) of the cell chamber, and has a function of sealing each cell chamber. An exhaust passage 15 communicating with all the exhaust pipes 13 of each cell chamber is formed by a side upper cover 100 which covers the outside of the side inner cover 1. This exhaust passage 13 communicates with a hole 16 in the upper part of the battery case.

An upper cover 17 for the upper surface and an upper cover 18 for the upper surface which covers the inner cover are attached to the upper portion of the battery case.
The inner lid 17 for the upper surface covers the connecting bodies 11 and 12 that crawl on the upper part of the battery case, and is provided with a positive terminal 19 and a negative terminal 20 protruding from the upper surface. The positive terminal 19 is connected to the end of the connector 11, and the negative terminal 20 is connected to the end of the connector 12. A hole 21 communicating with the hole 16 (see FIG. 2)
Is formed on the inner lid 17.

The terminal 19,
The upper cover 18 for the upper surface is covered so as to avoid 20, and an exhaust passage 22 communicating with the hole 21 is formed between them. At the end of the exhaust passage 22, there is provided a cylindrical small chamber 24 which communicates with a pair of outlets 23 formed on the side surface of the upper cover 18, and an explosion-proof filter 25 is fitted in this chamber 24. Therefore, the exhaust gas guided to the exhaust passage 22 is guided to the discharge port 23 through the filter 25 of the small room 24 and discharged to the outside.

The outlet 23 has a shape protruding to the outside as shown in FIG. 2, and a hose or the like is connected to the outlet 23 to discharge exhaust gas to the outside of a battery storage box such as an iron box. By doing so, it is possible to prevent the exhaust gas from accumulating in the storage box and causing a fire explosion.

[0016]

As described in detail above, according to the present invention,
Since the exhaust passage is formed from the side surface of the battery case to the upper portion of the battery case, the distance thereof is long, and the exhaust passage is bent in the middle. Therefore, in the exhaust gas, the acid fog is easily condensed while passing through the exhaust path, and the acid fog rarely reaches the explosion-proof filter disposed at the end of the exhaust path, so that the filter can be prevented from being clogged. In addition, since the ignition explosion of the exhaust gas is prevented by the explosion-proof filter, the explosion does not reach the exhaust gas in the cell chamber or the exhaust passage far from the filter. Therefore, even if an explosion occurs near the discharge port, the exhaust pipe and exhaust valve of each cell chamber are not damaged, so that the sealing of each cell chamber can be maintained, battery performance can be prevented from deteriorating, and the outside of the electrolyte can be prevented. Can be prevented, so that corrosion of battery peripheral devices can be prevented.

[Brief description of the drawings]

FIG. 1 is an exploded view of an embodiment of the present invention as viewed from an opening surface of a battery case.

FIG. 2 is a top view of FIG.

FIG. 3 is a sectional view taken along line A-A ′ of the lid of FIG. 2;

FIG. 4 is a side view showing an embodiment of the present invention in which a lid is removed from an upper surface and a side surface.

FIG. 5 is a cross-sectional view showing a side middle cover and an upper cover according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side lid 2 Battery case 3 Partition wall 4a-4f Cell room 5 Pole group 13 Exhaust tube 15,22 Exhaust passage 23 Outlet 25 Explosion-proof filter

Claims (1)

[Claims] 1. A side wall of a battery case is opened, and the inside of the battery case is divided into a plurality of cell chambers by partition walls that partition the opening surface, and the electrode group is housed in the cell chamber so that the working surface of the electrode plate is horizontal. In addition, in a retainer type monoblock battery in which a lid having an exhaust pipe communicating with the cell chamber is attached to the opening surface, an exhaust passage communicating with the exhaust pipe is provided from the lid to the upper part of the battery case. A retainer-type monoblock battery, wherein a gas outlet having an explosion-proof filter is formed at one end of an exhaust passage at an upper portion of a tank.