JP2009043675A - Gas exhausting structure for storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas exhausting structure, wherein no electrolyte enters into an exhaust out-let or short-circuit or liquid migration between cells does not occur when the electrolyte flows back into a storage battery, in the gas exhausting structure of the exhaust out-let included in the storage battery. <P>SOLUTION: A concave space is formed on the upper surface of the lid of the monoblock-type storage battery comprising a battery case with a plurality of cell chambers, which are covered with the one lid, and a plurality of exhaust holes correspondingly opening to the plurality of cell chambers of the battery case are formed in the bottom of the concave space. In addition, the gas exhausting structure is characterized by mutually connecting the two exhaust hole adjacent to the plurality of exhaust holes to W-shaped exhaust gas channels. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to an exhaust structure for a storage battery.

In lead-acid batteries for batteries, particularly automobiles and motorcycles, downsizing and high reliability of the exhaust structure are important issues in terms of volumetric efficiency and cost. Generally, there are two methods for exhausting monoblock lead-acid batteries having a plurality of cell chambers: a method in which individual exhaust plugs are provided in each cell chamber, and a collective exhaust method in which the exhaust paths of the cell chambers are connected. Recently, many batch exhaust systems with excellent space efficiency have been adopted.

As an example of the collective exhaust system, an opening of a battery case containing a plurality of electrode plate groups is closed with a lid, a recess is formed on the upper surface, and an exhaust hole communicating with the inside of the battery case is formed in the recess. A partition wall is formed, and an upper cover is applied to the upper surface of the concave portion to form an exhaust portion, and the shape of the partition wall between the exhaust holes is complicated, or the creeping distance between the exhaust holes is increased, so that the short circuit state by the electrolyte from the exhaust holes There is known an exhaust structure that prevents the occurrence of this. (Patent Document 1)
JP 2001-84981 A

The collective exhaust system is effective in preventing short-circuits between cell chambers when used with normal storage batteries upright, but the storage batteries roll over or stand upside down during a vehicle rollover accident or during storage battery handling. In such a case, the electrolyte enters the exhaust part. Even if the storage battery is immediately returned to the original upright state, there is a possibility that a difference in the liquid amount occurs between the cell chambers due to the electrolyte flowing between the cell chambers due to uneven reflux. In this case, the capacity is reduced or dispersed due to the one part cell chamber in which the amount of liquid is reduced, which leads to a reduction in the life of the storage battery.

Moreover, when the plane part area in an exhaust part is large, the adhesion amount of electrolyte solution will increase and it will lead to the increase in a short circuit current, and may also promote the fall of a storage battery capacity or a lifetime shortening.

In order to solve the above-described problems, the present invention has a structure in which exhaust holes are connected together by a W-shaped exhaust path and exhausted collectively.

(Function)
According to the present invention, even when the storage battery rolls over or is inverted and the electrolyte enters the exhaust part from each exhaust hole, the electrolyte stays in the V-shaped path adjacent to each other in the W-shaped exhaust path, The liquid does not mix with each other, and the liquid movement is difficult due to the presence of an air layer confined in the center of the W-shaped path in the path. Can be avoided.
Further, the electrolyte once entering the path returns to the original cell chamber through the exhaust hole when the storage battery is returned to the upright position.

  According to the present invention, even when the storage battery rolls over or is inverted, the amount of electrolyte entering the exhaust part is suppressed, and movement due to reflux between the cell chambers can be suppressed or prevented. Therefore, there is an effect that the short circuit between the cells can be prevented, the storage battery capacity can be maintained, and the life shortening can be avoided.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a top view of the lid 1. The lid is surrounded by a peripheral wall 21 protruding at the center of the upper surface to form a large concave space 2. Exhaust holes 3 that open to correspond to the respective cell chambers are formed in the bottom surface of the concave space portion 2. Each exhaust hole 3 is mutually connected by the W-shaped exhaust path 4 connected with the adjacent exhaust hole by the two U-shaped path | routes as shown in the figure. Reference numeral 41 denotes a pair of passage walls for forming the exhaust passage, which is formed so as to surround the exhaust hole 3 and protrude from the bottom surface of the recessed space portion 2. The height of the path wall 41 is slightly lower than the height of the surrounding wall 21. The bottom surface of the formed exhaust path 4 is made higher between the exhaust holes than the two exhaust hole sides located at both ends, so that the electrolyte that has entered the exhaust path can be quickly circulated. Is preferable.

Reference numeral 5 denotes a safety mechanism section defined by an auxiliary surrounding wall 51 in the concave space 2, and one gas (from the left in FIG. 1) passes through the W-shaped exhaust path 4 through the exhaust holes 3. The second is passed through the cell chamber and exhausted to the outside. 52 is a cylinder on which a cap-shaped rubber valve 53 indicated by a one-dot chain line is attached, and 54 is an attachment to which a filter is attached. The gas discharged by pushing the rubber valve 53 attached to the cylinder 52 is safely discharged to the outside through the filter fitted to the fitting portion 54. Reference numeral 55 denotes a concave groove formed on the bottom surface of the fitting portion 54, which penetrates the peripheral wall 21 of the concave portion 2 and communicates with the outside. The height of the auxiliary surrounding wall 51 is the same as the height of the surrounding wall 21. The concave space portion 2 formed in this way is covered with an upper lid (not shown) on the upper surface and fused to constitute an exhaust portion. The upper surface of the upper lid is flat, and a protruding wall having the same shape as the path wall 41 is formed at a position corresponding to the path wall 41 on the lower surface. While being fused, the protruding wall is fused to the upper end surface of the path wall 41.

In addition, you may form the recessed space part formed in a lid | cover so that it may be depressed below an upper surface, without projecting to an upper surface. Further, as described above, instead of forming a W-shaped exhaust path in the concave space portion, the exhaust path itself may be a concave space portion.

One lid 1 constituting the collective exhaust part having the shape shown in FIG. 1 is manufactured, and the inside is partitioned into six cell chambers by partition walls, and a positive electrode and a negative electrode are inserted into each cell chamber via a separator. A 6-cell monoblock type lead-acid battery was manufactured by heat-sealing and attaching to the upper surface opening of the battery case containing the alternately stacked electrode plates. In the concave space portion 2 of the lid 1, six exhaust holes are opened corresponding to the cell chambers, and the cross-sectional dimensions of the exhaust passage 4 connecting them are 1 mm in length and 3 mm in width. Further, the exhaust hole 3 was formed so as to be positioned at the center in the width direction of each cell chamber. The code | symbol 6 of FIG. 1 shows the part corresponding to the partition of a battery case, and 7 shows the terminal of a storage battery.

In Example 1, a lead storage battery was manufactured in the same manner as in Example 1 except that the cross-sectional dimension of the exhaust passage 4 was 0.5 mm in length.

(Conventional example)
It does not have a W-shape as an exhaust path, the lid upper surface concave space itself is used as an exhaust path, and a partition wall having the same height as the surrounding wall is formed at a position corresponding to the battery case partition inside the exhaust path. A storage battery was produced in the same manner as in Example 1 except that a 10 mm cutout was formed at a position opposite to the position where the hole was formed, and the inside of the concave space was formed to communicate with the cutout.

  Invert each lead-acid battery produced above, further lift it by hand and shake it back and forth 5 times (about 5 seconds) to infiltrate the electrolyte into the exhaust path and concave space, and then erect the electrolyte to When it was confirmed that the electrolyte moved between cells when refluxed, no liquid movement occurred in the lead storage batteries prepared in Examples 1 and 2, but liquid movement occurred in the lead storage battery prepared in the conventional example. did.

As described above, according to the present invention, it is possible to economically provide a storage battery in which the electrolytic solution does not move between cells.

It is a top view of the lid | cover of the storage battery which shows embodiment of this invention.

Explanation of symbols

1 Lid 2 Concave Space 3 Exhaust Hole 4 Exhaust Route

Claims (1)

A battery case in which a plurality of cell chambers are defined by partition walls is covered with a single lid, and a concave space portion having exhaust holes perforated corresponding to each cell chamber is formed on the upper surface of the lid, and the exhaust discharged from each exhaust hole In a storage battery exhaust structure in which gas is collected in one place and exhausted collectively to the outside, a storage battery characterized in that one exhaust hole and an exhaust hole adjacent thereto are connected by a W-shaped exhaust path Exhaust structure.