JP5148862B2 - Storage battery exhaust structure - Google Patents

Description

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

Conventionally, in a monoblock type storage battery, a lid body that is airtightly provided in a monoblock type battery case is provided with an exhaust hole that communicates with each cell chamber in the battery case, On the upper surface, the exhaust holes are partitioned by partition walls to form independent exhaust passages, the exhaust passages are divided into two exhaust passage groups, and the gas exhaust ports are connected to the respective exhaust passage groups through a common communication filter. It is well known to provide an exhaust structure for exhausting the air from the outside to the outside.
For example, it is disclosed in Patent Document 1 and Patent Document 2 below.
European Patent 0503264A1 JP 2004-172099 A

However, in the exhaust structure disclosed in Patent Documents 1 and 2, if any one of the gas exhaust ports is clogged, the gas from the group of exhaust passages communicating with the exhaust ports may be exhausted collectively. The battery may not be able to be cracked or ruptured.
An object of the present invention is to solve such a problem.

According to the first aspect of the present invention, the upper surface opening of the battery case having a plurality of cell chambers partitioned by partition walls is adjacent to the respective exhaust holes communicating with the respective cell chambers. A lid main body that forms an independent exhaust passage by a surrounding partition wall that isolates and surrounds the exhaust holes is provided to close the upper surface opening of the battery case, and an upper surface opening of the independent exhaust passage of the lid main body the upper cover is facilities and the lid body and the upper lid are bound tightly, in the exhaust structure of storage battery comprising comprises a gas outlet which allowed to simultaneously exhaust through at least two gas filters, and the lid body and the upper cover By being connected, independent exhaust passages are formed without communicating with each other from the respective exhaust holes to the gas filters, and communicating passages are formed to communicate with each other between the adjacent gas filters. Gas is a passage It exists in the exhaust structure of a storage battery characterized by communicating only through a filter .

According to the first aspect of the present invention, the collected electrolytes are prevented from intermingling with each other , and even if a certain gas discharge port is clogged, the communication path is connected through the communication passage. Evacuation is possible, the above-mentioned problems are solved, and a stable and good storage battery that is always free from anxiety can be obtained.

An example of an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a top view of a rectangular box-shaped lid body made of a synthetic resin molding. A part of the upper surface of the lid plate 1a of the lid body indicated by reference numeral 1 is formed in a number corresponding to the number of cell chambers formed by partitioning the interior of the battery case in which the lid body 1 is provided by a partition wall. In the example, a rectangular concave surface 1a1 whose bottom surface is a surface area extending over six cell chambers is formed, and the following exhaust structure is configured in the space of the concave surface. That is, in the rectangular concave surface 1a1 space, a rectangular four-circumference frame 2 having a desired height is projected from the bottom surface of the concave space 1a1, that is, the upper surface of the lid plate 1a, along the four inner circumferential wall surfaces. . In the illustrated example, the height of the upper end is the same as or higher than the bottom surfaces of the concave grooves 1b and 1b for fitting cylindrical gas discharge ports (described later) formed on the left and right sides of the concave space 1a1. Say it. Further, on the upper surface of the lid plate 1a, in the recessed space surrounded by the four surrounding frames 2, the lid plate 1a is positioned at a position corresponding to the six cell chambers defined inside the battery case. The exhaust hole 3a and the liquid injection port 4 communicating with each cell chamber are formed, and one set of the exhaust cylinder 3 and the liquid injection cylinder 4a protruding from the bottom surface is provided on the outer periphery of each of the exhaust hole 3a and the liquid injection port 4. Each exhaust cylinder 3 from the upper surface of the cover plate 1a is protruded to an appropriate height higher than the height of the four peripheral frames 2, and each liquid injection cylinder 4a has the same height as the height of the four peripheral frames 2. I made it project.
Further, six independent exhaust passages were formed in the four peripheral frames 2 as described below. That is, the four surrounding frames 2 are provided with partition walls 5a, 5a,... Projecting at the same height as the four surrounding frames 2 so as to isolate the adjacent exhaust tubes 3 and 3 from each other and surround each exhaust tube 3. Then, the six exhaust cylinders 3, 3,... Are partitioned into six independent exhaust passages 6a, 6a,. Further, in each independent exhaust passage 6a, it crosses the side of the exhaust cylinder 3 from the side surface of each independent liquid injection cylinder 4a, extends to the vicinity of one long side frame 2a of the four peripheral frame 2, and A partition wall 7a having the same height as that of the four peripheral frames 2a is projected so that each of the exhaust passages 6a is formed on the exhaust tube 3 side, and an inner passage 6a1 formed in a small chamber surrounding the exhaust passage 6a and the partition wall 7a. It was divided into an outer passage 6a2 communicating with the inner passage 6a1 through a gap 8a existing between the inner side surface of the long side frame 2a. Further, in the inner passage 6a1 formed in the small chamber, a partition wall 9a extending between the exhaust tube 3 and the partition wall 7a from the inner surface of the long side frame 2a and having the same height as the four peripheral frames 2 Thus, the gas that has entered the inner passage 6a1 from each cell chamber in the battery case via the exhaust tube 3 is prevented from being directly discharged from the gap 8a to the outer passage 6a2. After passing through the passage 6a3 formed between the partition wall 9a and the partition wall 7a, the passage distance is extended so as to be discharged from the gap 8a to the outer passage 6a2, thereby collecting the electrolyte mist. I tried to increase. Further, a splash-proof wall 10a having the same height as the partition wall 7a was projected from the outer surface to the side surface of the partition wall 7a so as to project into the outer passage 6a2. A plurality of the splash-proof walls 10a may be disposed so as to protrude into the outer passage 6a2.
In the drawing, 11 is a partition wall projecting downward from the back surface of the lid body 1 corresponding to the partition wall of the battery case to which the lid body 1 is applied, 12 is a positive terminal, 13 is a negative terminal, and 14 is a specific gravity liquid A surface indicator plug is shown.

FIG. 2 is a rear view of the upper lid 20 made of a synthetic resin having a size and shape suitable for being applied in contact with the upper surface of the four peripheral frames 2 of the lid body 1, and FIG. The top view of is shown. In the embodiment, the upper lid 20 has a box shape with a concave space formed on the back side.
The upper lid 20 includes a lid plate 20a and a four-circumferential side wall 20b extending downward from the four peripheral edges to a desired height, and the lower end of the four-circumferential side wall 20b applies the upper lid 20 to the four peripheral frames 2 of the lid main body 1. The outer wall 20b1 inserted into the gap between the four peripheral frame 2 and the outer peripheral surface of the concave surface 1a1, and the inner peripheral wall 20b2 in contact with the upper end of the four peripheral frame 2. It forms in the lower end which has the level | step difference for fitting latching which consists. Thus, the upper lid 20 is brought into contact with and engaged with the upper end of the four peripheral frame 2 of the lid main body 1 and is bonded to each other by heat fusion and adhesion. The lid plate 20a has six liquid injection holes formed at positions corresponding to the liquid injection cylinders 4a, 4a,... Of the lid main body 1 when placed on the lid main body 1. Further, independent exhaust passages corresponding to the six independent exhaust passages 6a, 6a,... Provided on the back surface of the lid body 1 were formed in the concave space on the back surface of the upper lid as follows.
More specifically, on the back surface of the lid plate 20a, there are six liquid injection ports 4, 4,... And liquid injection cylinders 4a, 4a,. Are arranged at the same height as the four peripheral side walls 20b2, with six liquid injection ports 4, 4,... And six liquid injection cylinders 4b, 4b,. The surrounding partition walls 5b, 5b,... Are flush with the surrounding wall 20b2 at positions corresponding to the surrounding partition walls 5a, 5a,... Projected from the upper surface of the lid plate 1a within the four peripheral frames 2 of the lid body 1. In this manner, independent exhaust passages 6b, 6b,... Corresponding to the independent exhaust passages 6a, 6a,... Formed in the lid body 1 are formed. Further, the partition wall 7b is disposed at a position corresponding to the partition wall 7a disposed on the lid body 1, the partition wall 9b is disposed at a position corresponding to the partition wall 9a, and the position corresponding to the splash-proof wall 10a attached to the side surface of the partition wall 7a. Each of the spray walls 10b is disposed so as to protrude from the back surface of the lid plate 20a to the same height as the four-side wall 20b2, so that the gap 8a formed in the lid body 1, the inner passage 6a1 formed in the small chamber, and the outer side A gap 8b and an inner passage 6b1 and an outer passage 6b2 formed in the small chamber were formed at positions corresponding to the passage 6a2.

  In the illustrated example, the six exhaust passages 6a, 6a,... Formed in the lid body 1 and the six exhaust passages 6b, 6b formed in the upper lid 20 are clearly shown in FIGS. As shown, the left half and the right half of each of the left and right halves are divided by the central surrounding partition walls 5a and 5a so that the left and right objects are left and right. In the drawing, the three independent exhaust passages 6a, 6a, 6a on the left side of the lid body 1 and the three independent exhaust passages 6b, 6b, 6b on the left side of the upper lid 20 are communicated in the vertical direction. Exhaust passages 6, 6, 6 are formed, and these exhaust passages 6, 6, 6 communicate with an explosion-proof gas filter 21 provided in the left corner of the four-side wall 20b on the left side on the upper lid 20 side. On the other hand, in the drawing, the three independent exhaust passages 6a, 6a, 6a on the right side of the lid body 1 and the three independent exhaust passages 6b, 6b, 6b on the right side of the upper lid 20 are Communicate vertically The exhaust passages 6, 6, 6 are formed, and these exhaust passages 6, 6, 6 are open ends of the exhaust passages 6b, 6b, 6b on the upper lid 20 side, and are on the right side of the four-side wall 20b on the right side. It was made to communicate with the gas filter 21 for explosion-proof provided in the corner part.

  More specifically, as shown in FIG. 2, the three independent exhaust passages 6b, 6b, 6b on the upper lid 20 side extend into the left corner of the four-side wall 20b, and the three independent exhaust passages on the right side. The passages 6b, 6b, 6b extend to the right corner of the four-side wall 20b, and the left and right corners are divided into three exhaust passages 6b, 6b, 6b and 6b, 6b, 6b. The partition walls 5b, 5b, 5b and 5b, 5b, 5b are at the same level as the upper ends of the partition walls 5b, 5b, 5b, or lower, that is, on the side closer to the cover plate 20a of the upper cover 20, the outer end surfaces of these partitions. The gas filter mounting cylinders 22 and 22 to which the gas filter 21 for explosion prevention is mounted are fixed by any means such as press-fitting or bonding to each other, and are located on the sides of the respective filter mounting cylinders 22 and 22. Gas discharge ports 23 and 23 communicating with the mounting cylinders 22 and 22 are provided. In the illustrated example, cylindrical gas exhaust ports 23 and 23 are provided, and the inner ends thereof are opened to communicate with the filter mounting cylinders 22 and 22, respectively. Each of the cylindrical gas exhaust ports 23 and 23 is, for example, a cylinder having a hollow rectangular cross section, and the holes provided in the left and right short side walls of the four-side wall 20b are gas-liquid tightly penetrated and fixed. Thus, when the upper lid 20 is applied to the upper surface of the lid body 1, the left and right filter mounting cylinders 22 and 22 have upper surface openings at the outer ends of the left and right exhaust passages, respectively. The left and right gas exhaust ports 23 and 23 are located at the positions indicated by the circular phantom lines above the space portions 2c and 2c in the left and right corner portions of the four peripheral frames 2 of the lid body 1 and the lid body 1 1 is located in the above-described fitting grooves 1b and 1b on the left and right of the upper surface of 1.

  Thus, in order to assemble the lead-acid battery, in order to close the upper surface opening of the battery case 40 shown in FIGS. 11, 11,... Are fixed to the four peripheral side walls 40 a of the corresponding battery case 40 and the partition walls 40 c partitioning the inside of the battery case 40 into six cell chambers 40 b by heat fusion, adhesion, etc. The upper lid 20 is provided on the upper surface, and the four peripheral frames 2b of the upper lid 20 are fitted on the upper surface of the four peripheral frames 2 of the lid body 1, and are bonded to each other in a gas-liquid tight manner by heat fusion, adhesion, or the like. Thus, the surrounding partition walls 5a, 5a,..., 5b, 5b,... Are combined by the combination of the four peripheral side walls 20b of the upper lid 20 and the four peripheral frames 2 of the lid body 1. , And the independent exhaust passages 6a, 6a,... On the lid body 1 side surrounding the respective exhaust cylinders 3, 3,... And the exhaust passages 6b, 6b,. Each of the books has independent exhaust passages 6, 6,. In each exhaust passage 6,6, ..., a partition wall in which the partition walls 7a, 7b are combined, a partition wall in which the partition walls 9a, 9a are combined, and a splash-proof wall in which the splash-proof walls 10a, 10b are combined are obtained. A lead storage battery in which an inner passage, an outer passage, and a gap formed in a small chamber communicating in the vertical direction are formed can be obtained. Thus, the electrolytic solution is injected from the liquid injection ports 4 and 4 of the upper lid 20 of the storage battery, and the electrode plates (not shown) accommodated in the cell chambers 40b, 40b,. The electrolyte solution is held, and a sealing plug (not shown) is applied to each liquid injection port 4 to constitute a lead storage battery.

  The gas generated in each cell chamber of the battery case at the time of charging or overcharging of the lead storage battery enters the respective exhaust passages 6, 6, ... through the corresponding exhaust pipes 3, 3, ... Next, the gas from each of the three independent exhaust passages 6, 6, 6 on the left side and the right side reaches the front space 2c, 2c, and then the left and right gas filters 21, The gas is exhausted from the left and right gas outlets 23 and 23 to the outside through the gas outlet 21 and the gas outlet 23, respectively.

  Thus, while the gas passes through each of the independent exhaust passages 6, 6,..., It collides with the above-mentioned various partition walls, splash-proof walls, etc., or is cooled on the upper surface of the upper lid, and the electrolyte mist in the gas Is trapped and only the gas is discharged to the outside, so that liquid leakage in the exhaust is prevented. On the other hand, the collected electrolytes do not mix with each other. In order to flow down the electrolytic solution trapped in each of the independent exhaust passages 6, 6,... And return them to the cell chambers through the respective exhaust cylinders 3, 3,. The bottom surfaces of the independent exhaust passages 6, 6,... Corresponding to the upper surface of the cover plate 1a are inclined down slopes from the outer end side of the exhaust passages 6 to the exhaust holes 3a. In this case, a notch communicating with the exhaust hole 3a is formed in the lower part of the peripheral side wall.

Furthermore, the exhaust structure of the storage battery exemplified above is configured as follows so that liquid leakage is prevented even when the storage battery is inverted.
That is, the exhaust cylinder 3 communicating with each cell chamber 40b of the battery case 40 to the lid plate 1a of the lid body 1 is configured as two exhaust cylinders 31 and 32. In the example shown in FIGS. 1 and 4 to 6, the exhaust hole 3 a of one exhaust cylinder is divided into two by the partition wall p to form two compact exhaust cylinders 31 and 32. Furthermore, one of the two exhaust cylinders 31 and 32 has a length extending from the upper surface of the cover plate 1a, that is, the length extending toward the exhaust passage 6a, that is, the height, and the other one. While the length of the second exhaust cylinder 32, that is, higher than the height, the second exhaust cylinder has a length extending downward from the lower surface of the cover plate 1a of the first exhaust cylinder 31, that is, to the cell chamber 40b side. Configured shorter than 32 lengths.
Further, the exhaust hole 31a of the first exhaust cylinder 31 has a smaller diameter on the upper side opening to the exhaust passage 6a than the lower side opening to the cell chamber 40b side, and the exhaust hole 32a of the second exhaust cylinder 32 is A reverse taper is formed such that the diameter gradually increases from the chamber 40b side toward the exhaust passage 6a side.
Further, the upper end surfaces of the first and second exhaust cylinders 31 and 32 including the partition wall p are formed as inclined surfaces. In this case, as clearly shown in FIG. 6, the lower end of the upper end opening surface 32a1 of the inclined exhaust hole 32a of the second exhaust cylinder 32 is opened at the same position as the upper surface of the cover plate 1a, and is opened from the exhaust passage 6. The trapped electrolytic solution flowing down can be refluxed into the cell chamber through the exhaust hole 32a of the second exhaust cylinder 32.

Further, in the exhaust passage 6a of the lid body 1, the outer periphery of the exhaust tube 31 and 32, FIG. 1, as clearly shown in FIG. 5, the presence of the annular space S _1, the upper surface of the lid plate 1a projecting from provided with an annular partition wall 33a, a portion of the annular partition wall 33a, while allowed to communicate with the notch port 34 which opens the annular space S ₁ and the inner passage 6a1 of the outer upward, the annular space S ₁ through form, a cutout opening 34 resides exhaust pores 31a of the first and second exhaust pipe 31, and 32a and the annular space S _1, and to be communicated. In the illustrated example, the cutout 34 is provided at a position facing the exhaust hole 32a.

  On the other hand, as shown in FIG. 2, the upper lid 20 is provided with the respective annular partition walls 33a, 33a, 33a, 33a, etc. disposed in the lid body 1 in independent exhaust passages 6b, 6b,. Are projected from the back surface of the upper lid 20 at positions opposite to the annular partition walls 33a. The annular partition walls 33b, 33b,.

Each of the partition walls 9a, 9a,... Disposed inwardly extending from the long side frame 2a of the four peripheral frame 2 of the lid body 1 has an annular partition 33a, each corresponding to its inner end. 33a,... Are formed so as to be combined with the outer peripheral side surfaces of the upper lid 20, and the partition walls 9b, 9b,. Are formed so as to be combined with the outer peripheral side surfaces of the corresponding annular partition walls 33b, 33b,.
Thus, the inner passages 6a1 formed in the small chambers of the exhaust passages 6a are formed as bypass passages around the annular partition wall 33a. 1 and FIG. 5, when the notches 34, 34,... Of the respective annular partition walls 33a, 33a,... Are arranged toward the long side walls 2a, 2a,. The gas discharged from the exhaust pipes 31 and 32, after colliding with the long side walls 2a and 2a, detours along the peripheral side walls of the respective annular partition walls 33a, 33a,. Since it enters 6a2, ..., the mist collection performance can be further improved.

Thus, when the upper lid 20 is airtightly applied to the upper surface of the lid body 1, the lower end of the annular partition wall 33b depending from the back surface of the upper lid 2 is located above the upper surface of the lid body 1 as shown in FIG. The upper end of the annular partition wall 33a extending to the upper end of the upper lid 20 is bonded to the upper end of the annular partition wall 33a by fusion, adhesion, or the like. The cup-shaped covering portion 35 covers the upper portions of the exhaust pipes 31 and 32 with the gap S ₂ above the cup space S ₃ and the annular space S ₁ below the cup space S _3. I tried to do it.
Further, the height of the annular partition wall 33a projecting on the upper surface from the lid plate 1a of the lid body 1, and accordingly, the upper surface opening end 34a of the notch 34 such as a rectangular shape with the upper end opened to the annular partition wall 33a. Is set at the same height as the lower end of the inclined opening surface of the upper end 31a1 of the exhaust hole 31a of the first exhaust cylinder 31 or a position lower than that.

FIG. 7 shows a state where liquid leakage is prevented in a state where the storage battery having the exhaust structure is inverted.
That is, when the storage battery is in an inverted state, as shown in FIG. 7, the electrolytic solution in the cell chamber 40b is evacuated by the exhaust holes 31a of the first exhaust cylinder 31 and the exhaust holes 32a of the second exhaust cylinder 32 that are turned upside down. also it enters the liquid replacement into the exhaust passage 6a1, that enters the electrolyte reservoir in the cup space S _3, eventually closing the upper end opening 31a1 of the first exhaust pipe 31. Then, the gas-liquid replacement through both the exhaust cylinders 31 and 32 is not performed, so-called air lock is generated, and this brings about an effect of preventing liquid leakage with no further outflow of the electrolytic solution. E indicates the electrolyte level during airlock.
In this case, as described above, by making the upper diameter of the exhaust hole 31a of the first exhaust cylinder 31 that opens to the exhaust passage side smaller than the lower diameter of the side that opens to the lower side of the cell chamber 40b. Furthermore, it is difficult for the electrolyte to flow out.
When returning to the original upright state from this state, it flows down into the cell chamber 40b due to its own weight and returns to the cell chamber 40b.
In addition, even when the lead storage battery lies on its side, the electrolyte flowing out of the cell chamber 40b is no longer gas-liquid replacement at the moment when the exhaust hole 31a or 31b is closed, so that an air lock occurs and Liquid leakage is prevented.

  Note that the cup-shaped covering portion 35 including the lid plate portion 20a1 of the upper lid 20 and the annular partition wall 33b depending on the cup-shaped covering portion is manufactured as a separate member from the upper lid 20a, and this cup-shaped covering portion provided on the upper lid 20 It may be attached to a fitting opening (not shown) by heat fusion or the like.

Next, a more detailed embodiment of the exhaust structure having the above-described liquid leakage prevention function will be described.
As clearly shown in FIG. 6, the first exhaust cylinder 31 and the second exhaust cylinder 32 are cylindrical, and the upper end of the first exhaust cylinder 31 is obliquely crossed to form an inclined surface, and the lower end of the exhaust hole 31a of the first exhaust cylinder 31 The hole diameter was 2 mm, and the hole diameter at the upper end was 1 mm. The hole diameter at the lower end of the exhaust hole 32a of the second exhaust cylinder 32 was 2.5 mm, and the hole diameter at the upper end was 3 mm.

In order to conduct a leak test, the lead storage battery prepared above is inverted, and left in this state for 10 minutes, and then it is erected again, disassembled, and examined. Whether or not the electrolyte leaks into the exhaust passage. As a result, no liquid leakage was found.
Further, the storage battery was turned upside down so that the upper lid was inclined, and was left standing in this state for 10 minutes, and then it was erected, and the leakage of the electrolytic solution was examined in the same manner, but there was no leakage at all.

The storage battery having the exhaust structure of the above embodiment divides the six exhaust passages 6, 6,... Into two groups, the gas from the independent exhaust passages 6, 6, 6 on the left and the independent exhaust on the right The gas from the passages 6, 6, and 6 is exhausted from the gas discharge ports 23 and 23 through the common explosion-proof filter 21 on the left side and the common explosion-proof gas filter 21 on the left side. During the use, either one of the gas discharge ports 23 may be clogged, which may cause damage or explosion of the storage battery.
In order to solve such a problem, according to the present invention, the following exhaust structure is provided.
That is, as shown in FIGS. 1 and 2, on the upper surface of the lid plate 1a of the lid body 1, on the inner side of the four peripheral frame 2, the long side wall 2a and the long side wall 2a are opposed to and parallel to each other. It extends between the two sides of the long side wall 2a and is connected to the long side U-shaped surrounding partition wall 5a in the form of a long rectangle and both ends thereof face the left and right space portions 2c, 2c. When the upper lid 20 is applied, a long rectangular mutual communication path 50 is formed below the left and right gas filters 21 and 21 disposed on the upper lid 20, while being formed inside the four-side wall 20b of the upper lid 20. Corresponding to the long rectangular communication path 50 provided in the lid body 1, the communication path 50 extends parallel to the four-side wall 20b and is connected to the long side wall 20b1 at both ends thereof. A communication path 50 having a long rectangular shape and both ends thereof facing the left and right space portions 2c and 2c was formed between the rectangular surrounding partition wall 5b.
Thus, when the lid body 1 is applied to the upper lid 20, the left and right explosion-proof gas filters 21, 21 in the upper lid 20 are connected to the communication path 50 on the back surface of the lid body 1 and the communication path 50 of the upper lid 20. Is located above the left and right ends of the communication passage 50 combined in the vertical direction, so even if one of the left and right gas discharge ports 23, 23 is clogged, the group of exhaust passages 6, 6 on the clogged side , 6 can be exhausted from the gas discharge port 23 via the other gas filter 21 via the mutual communication path 50, thereby solving the above-mentioned problems and ensuring a stable storage battery. .
The exhaust structure provided with such a mutual communication path 50 is applied not only to the above-described liquid storage battery but also to a non-liquid storage battery that does not produce a free electrolytic solution in which an electrode plate group is completely impregnated. Needless to say you get.

  In the storage battery of the above-described embodiment, the case where the entire exhaust passage is divided into two groups, and the communication passage 50 that communicates them with each other is formed for two filters that are arranged in common for each group is shown. Regardless of the number of exhaust passages, in the case of a storage battery having an exhaust structure having three or more filters arranged for each group, the entire exhaust passage is divided into three or more. What is necessary is just to provide the communicating path which mutually communicates between the filters.

  In the conventional storage battery exhaust structure, the gas generated from each cell chamber of the battery case enters the corresponding exhaust passage through the exhaust tube, passes through the exhaust passage, and is discharged to the outside through the filter. However, in this passage process, the gas collides with a partition wall surface in the length direction of the exhaust passage, a splash-proof plate protruding from the side surface of the partition wall into the exhaust passage, or the cooling effect in the exhaust passage. As a result, the mist in the gas stays as droplets. After that, the gas generated again is repeatedly discharged to the outside in the same manner, and the liquid droplets staying in the exhaust passage are gradually moved to the gas discharge port side due to vibration when mounted on an automobile. Move and eventually leak outside.

In order to solve such problems, the following exhaust structure was adopted.
That is, in each exhaust passage 6a, 6a,... Disposed on the upper surface of the lid body 1, the bottom surface (that is, the upper surface of the lid body 1) is extended from the exhaust tube 3 to the gas exhaust port 23 over the entire length. As shown in FIGS. 1 and 8, a desired number of steps 60, 60,... Are formed in the middle of the inclined bottom surface. Accordingly, the inclined bottom surface over the entire length is formed with inclined bottom surfaces a, b, c,... Divided between adjacent steps 60, 60, respectively.

Thus, the gas generated in the cell chamber enters the detour inner exhaust passage 6a1 from the exhaust tube 3 through the notch 34 provided in the outer annular partition wall 33a, and then continues to the outer passage 6a2 via the gap 8a. 1 and 8, the inclined bottom surface of the inner passage 6a1 formed in a staircase shape around it is divided by each step 60, as clearly shown in FIGS. It passes through a, b, c, d and further passes through the gap 8a to the section inclined bottom surface e of the outer passage 6a2, while the mist in the gas forms a step 60 formed between the adjacent section inclined bottom surfaces. Since it collides with a vertical step and is captured by this, it can not only improve the mist collecting effect, but also the exhaust passage surface due to the generated gas, etc., compared to the conventional exhaust passage consisting of a full-length inclined surface without a step. Ascending movement of droplets staying in the gas outlet side is arranged S of the level difference 60, 60, ... by so impeded, compared with the conventional exhaust passage above, can of improving the liquid leakage prevention effect of the gas discharge port.
Furthermore, as shown in FIG. 1, when the gas is not discharged, the liquid droplets staying in the exhaust passage 6a flow down the inclined bottom surface in the direction of the arrow while aggregating, and the lid of the lid body 1 Although the upper end inclined opening surface of the inclined exhaust hole 32a of the second exhaust cylinder 32 opened to the same level as the upper surface of the plate 1a returns to the cell chamber 40b from the lower end opening surface at the same position as the upper surface of the lid body 1. By forming the step on the inclined bottom surface, the flow down speed becomes faster than in the case where the conventional exhaust passage has a flat inclined bottom surface without a step, and the reflux efficiency can be increased.
Needless to say, a step can be formed at a desired location on the inclined bottom surface of the linear outer exhaust passage 6a1, if necessary.
In addition, it goes without saying that an exhaust structure in which a step is provided in such an exhaust passage can be applied to a non-liquid storage battery as well as a liquid storage battery.

Although the present invention has been described with lead storage batteries in the above embodiments, it can be applied to nickel-cadmium batteries and other storage batteries.
Further, in the above embodiment, a box-shaped one is used as the upper lid 20. The lid plate is airtightly bound to the back surface of each of the surrounding bulkheads in the four peripheral frames of the lid body, and the lid plate is connected via at least one gas filter communicating with each independent exhaust passage. You may form so that it may exhaust collectively from the gas exhaust port drilled in.
Further, in the above embodiment, the four peripheral frames 2a of the lid body 1 are provided with the upper surface as the concave surface 1a1 and in the concave space, although not shown, the upper surface of the lid body is a flat surface, The exhaust structure may be formed so as to protrude upward from the flat surface, and the exhaust structure described above may be configured therein. In the above embodiment, the upper lid is slightly protruded from the lid body, but the upper lid may be flush with the lid body.

1 is a top view of a lid body of an exhaust structure for a storage battery according to an example of the present invention. FIG. The back view of the upper cover given to the upper surface of the cover main body. The top view of this upper cover. The upper side figure which removed the part of the storage battery assembled by giving a lid main body and an upper lid to the upper surface of a battery case one by one. FIG. 5 is a cross-sectional view taken along the line V-V in FIG. Fig. 5 is an enlarged view of the main part of the exhaust structure of the storage battery, taken along line VI-VI in Fig. 4. The expanded longitudinal cross-sectional view of the said principal part which shows the liquid leak prevention state when the storage battery is turned upside down. The perspective view of the exhaust passage of the battery.

Explanation of symbols

1 Lid body
3a Exhaust hole
6a Exhaust passage
21 Gas filter
23 Gas outlet
50 Reciprocal passage

Claims (1)

A surrounding partition wall that isolates and surrounds each of the exhaust holes communicating with each of the cell chambers at the upper surface opening of the battery case having a plurality of cell chambers partitioned by a partition wall. each independently lid body forming the exhaust passages are upper surface opening of the electric vessel is closed by subjected lid body and upper lid upper lid into force on the upper surface opening of each independent exhaust passages of the lid body : it is bound tightly, in the exhaust structure of storage battery comprising comprises a gas outlet which allowed to simultaneously exhaust through at least two gas filters, by which the lid body and the top lid is bound, from the exhaust holes of the respective An independent exhaust passage is formed without communicating with each other to the gas filter, a communication passage is formed between the adjacent gas filters, and the communication passage communicates with each exhaust passage only through the gas filter. Exhaust structure of storage battery, characterized in that that.

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