JP2010205587A - Lead-acid storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lead-acid storage battery capable of preventing leakage of electrolyte solution to the outside when falling down or preventing the amount of electrolyte solution in a series of cell chambers provided in the battery case from becoming uneven. <P>SOLUTION: Exhaust air chambers D1 to D6 corresponding to cell chambers in the battery case are formed between the middle lid portion 4 and the upper lid portion 5 provided in a lid 3 of the battery case. A first and a second longitudinal direction fluid passages L1, L2 which extend in a longitudinal direction of the middle lid portion are formed at both sides of these exhaust air chambers, and the longitudinal direction fluid passage L1 is connected to concentration exhaust air chambers E1, E2 provided at both ends of the middle lid. The longitudinal direction fluid passages L1, L2 are connected through width direction fluid passages W1a, W1b. One circulation hole h which communicates the exhaust air chamber with the cell chamber is formed in the vicinity of a corner part C1 in each exhaust air chamber, and a fluid passage W2 having an opening into the exhaust air chamber is provided in the exhaust air chamber at the other corner part C4 in a diagonal position of the corner part C1. Through this fluid passage W2, each exhaust air chamber is connected to the second longitudinal direction fluid passage L2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lead storage battery in which an exhaust chamber is formed in a lid portion of a battery case.

  The monoblock type lead-acid battery includes a battery case having a battery case body formed so as to form a substantially rectangular parallelepiped as a whole and a lid portion that closes an opening at the upper end of the battery case body. A plurality of cell chambers arranged along the longitudinal direction of the battery case are formed inside. An electrode plate group formed by laminating a positive electrode plate and a negative electrode plate via a separator is accommodated together with an electrolyte in each cell chamber to constitute a cell, and a cell in each cell chamber is placed between adjacent cells in a cell. The storage battery is configured by being connected through the connecting portion. A positive electrode terminal and a negative electrode terminal are attached to the lid portion of the battery case at one end and the other end in the longitudinal direction.

  In this type of lead-acid battery, it is necessary to be able to release the pressure in each cell chamber in order to prevent an increase in gas pressure in each cell chamber. For this reason, an exhaust plug having a structure that can discharge gas while preventing leakage of the electrolyte is widely used for each cell chamber. However, if an exhaust plug is provided for each cell chamber, Since the mist of the electrolytic solution discharged to the outside through the exhaust plug is dissipated into the atmosphere as it is, it is necessary to replenish the electrolytic solution on a regular basis, and maintenance-free operation cannot be achieved. As a lead storage battery that solves such a problem, an exhaust chamber corresponding to each cell chamber is provided in the lid portion of the battery case, and the mist of the electrolytic solution that has come out from each cell chamber is retained in the exhaust chamber and liquefied in the exhaust chamber. A solution in which an electrolytic solution is circulated in each cell chamber is known.

  In this type of lead-acid battery, as shown in Patent Document 1, a part of the lid portion of the battery case has an inner lid portion extending between one end and the other end in the longitudinal direction of the battery case, One end in the width direction is provided near one end in the width direction of the battery case, and the upper lid portion is joined on the middle lid portion. The inner lid portion has a concave portion on the middle lid portion that opens upward, and the upper lid portion has a concave portion on the upper lid portion side that opens downward, and these concave portions provide a gap between the middle lid portion and the upper lid portion. A space is formed in the space, and the space is partitioned into a plurality of exhaust chambers respectively corresponding to the plurality of cell chambers. Further, two flow holes of different sizes and shapes are provided through the bottom wall portion of each exhaust chamber partitioning between each exhaust chamber and the corresponding cell chamber, and in the bottom wall portion of each exhaust chamber, The portion provided with the flow hole is inclined so as to be the lowest.

  In addition, vent holes are formed through the exhaust chamber interval walls partitioning the plurality of exhaust chambers, thereby connecting the plurality of exhaust chambers to each other. Two concentrated exhaust chambers are provided so as to communicate with the exhaust chambers at both ends respectively disposed at both ends in the longitudinal direction of the middle lid portion, and these concentrated exhaust chambers are provided in the upper lid portion or the inner lid portion. It communicates with the outside through the exhaust port.

  In each exhaust chamber, a partition wall partitioning between the two circulation holes and a barrier portion for appropriately preventing the movement of gas exhausted from the cell chamber through the circulation hole are formed, and corresponding from each cell chamber through the exhaust hole. In the process in which the gas exhausted into the exhaust chamber moves toward the central exhaust chamber while being in contact with the barrier portion, the mist of the electrolyte contained in the gas is liquefied. Since the liquefied electrolyte solution flows through the inclined bottom wall portion of the exhaust chamber and is circulated from the circulation hole into the cell chamber, a decrease in the electrolyte solution in each cell chamber is suppressed.

  The inner lid portion is also provided with an electrolyte injection port that passes through the bottom wall portion of each exhaust chamber and communicates with each cell chamber. The inner lid portion and the upper lid portion are provided with a cylindrical portion surrounding the periphery of the electrolyte inlet in each cell chamber, and when the upper lid portion is joined to the inner lid portion, By joining together the cylindrical part by the side of a cover part, an electrolyte injection port is closed and it isolate | separates from the space in an exhaust chamber.

JP 2005-166318 A

  As described above, in a lead storage battery in which an exhaust chamber corresponding to each cell chamber is provided and a flow hole is provided in the bottom wall portion of each exhaust chamber, the cell is collapsed when the battery is transported, etc. The electrolyte flows out from the room into the exhaust room. When a large amount of electrolyte flows out from the cell chamber into the exhaust chamber, the leaked electrolyte eventually reaches the centralized exhaust chamber and leaks outside from the exhaust port, and the surroundings may be polluted.

  In the lead-acid battery disclosed in Patent Document 1, a series of exhaust chambers arranged in the longitudinal direction of the battery case are connected through a vent hole penetrating a partition partitioning between adjacent exhaust chambers. A relatively short fluid flow path was formed between the space and the concentrated exhaust chamber. For this reason, when the battery falls down, the electrolyte flowing into the cell chamber may reach the concentrated exhaust chamber in a relatively short time and flow out to the outside from the exhaust port.

  Moreover, in the lead storage battery shown in Patent Document 1, in order to prevent a large amount of electrolyte from leaking when the battery falls down, the partition between the two circulation holes is separated by a partition wall. If a large number of barrier ribs, etc. are provided, the structure of the inner lid portion and the upper lid portion becomes complicated. Therefore, the pattern of the joint portion between the inner lid portion and the upper lid portion becomes complicated, making it difficult to join the two, resulting in a product yield. I cannot help getting worse.

  Further, in the lead storage battery disclosed in Patent Document 1, since the electrolyte injection port surrounded by the cylindrical portion is provided in addition to the two flow holes in the bottom wall portion of each exhaust chamber, the inner lid portion and the upper lid portion are provided. The structure of the battery becomes more complicated and the cost of the battery is inevitably increased.

  Furthermore, in the lead storage battery shown in Patent Document 1, the electrolyte that flows out from each cell chamber into each exhaust chamber when it falls down flows into the other exhaust chambers, but the electrolyte that flows into other exhaust chambers When the battery is returned from the overturned state to the normal state, it does not always return to the original cell chamber. Therefore, once the battery is overturned, the amount of the electrolyte in the cell chamber becomes uneven. . In particular, when the battery falls down with one end in the longitudinal direction of the battery case down, the electrolyte flowing out from each cell chamber into each exhaust chamber is on the side of the other exhaust chamber at a position lower than each exhaust chamber. When the battery is turned over and the fallen battery is raised, the electrolyte that has moved down returns more to the cell chamber located below when the battery is overturned. The amount of the electrolytic solution in the cell chamber located in the cell chamber increases, and the amount of the electrolytic solution in the cell chamber disposed near the center in the longitudinal direction of the battery case becomes extremely small. Once such a condition occurs, the battery cannot function normally because it cannot be returned to a state in which a uniform amount of electrolyte is contained in each cell chamber.

  The object of the present invention is to prevent the electrolyte from leaking to the outside when it falls, or the amount of electrolyte in a series of cell chambers provided in the battery case from becoming uneven. Is to provide a lead acid battery.

  Another object of the present invention is to simplify the structure of the inner lid portion and the upper lid portion of the lid portion of the battery case, thereby facilitating the joining of the inner lid portion and the upper lid portion, thereby reducing the product yield. The object is to provide a lead-acid storage battery that can prevent costs and reduce costs.

  In the present specification, first to fifteenth inventions are disclosed in order to achieve the above object. In order to facilitate understanding of the configuration of the present invention, in the following description, the reference numerals described in the drawings used in the description of the embodiments of the invention to be described later are written side by side.

(First invention)
The first invention shows a basic configuration of the invention for achieving the above object. The lead storage battery to which the present invention is directed has a battery case body 2 that is formed in a substantially rectangular parallelepiped shape as a whole and a lid portion 3 that closes an opening at the upper end of the battery case body 2. The battery case 1 is provided with the direction along the long side and the direction along the short side as the longitudinal direction and the width direction, respectively, and a plurality of cell chambers arranged along the longitudinal direction are provided inside the battery case body 2. Is formed. A part of the lid 3 of the battery case extends between one end and the other end of the battery case 1 in the longitudinal direction, and the direction along the longitudinal direction and the direction along the width direction of the battery case are the longitudinal direction and width, respectively. A middle lid portion 4 is provided, and an upper lid portion 5 is joined on the middle lid portion 4, and a plurality of cell chambers respectively corresponding to a plurality of cell chambers are interposed between the middle lid portion 4 and the upper lid portion 5. Independent exhaust chambers D1 to D6 are formed. A through hole h is provided through the bottom wall of each exhaust chamber partitioning between each exhaust chamber and the corresponding cell chamber, and an upper gas space in each cell chamber is provided in the corresponding exhaust chamber through the through hole h. Communicated. Concentrated exhaust chambers E1 and E2 are provided between the inner lid portion 4 and the upper lid portion 5 at a position near at least one end in the longitudinal direction of the battery case 1, and a plurality of exhaust chambers are provided in the concentrated exhaust chamber. Communicated. The central exhaust chamber is opened to the outside through the exhaust port 35, and the exhaust gas reaching the central exhaust chamber is exhausted to the outside through the exhaust port 35.

  In the present invention, each exhaust chamber has a pair of width direction facing surfaces Sa, Sb opposed to the width direction of the inner lid portion 4 and a pair of longitudinal direction facing surfaces Sc, Sd opposed to the longitudinal direction of the inner lid portion 4. And four corner portions C1 to C4 are formed in each exhaust chamber, and the outer sides of the plurality of exhaust chambers D1 to D6 are arranged in the longitudinal direction of the inner lid portion at one end side in the width direction of the inner lid portion 4. A first longitudinal fluid passage L1 extending along the end and connected to the concentrated exhaust chamber, and the outside of the plurality of exhaust chambers D1 to D6 on the other end side in the width direction of the inner lid portion 4 A first longitudinal fluid passage L2 extending in the width direction of the inner lid portion extends between the second longitudinal fluid passage L2 extending along the longitudinal direction and a specific adjacent exhaust chamber selected from the plurality of exhaust chambers D1 to D6. At least one inter-exhaust chamber widthwise fluid passage W1a connecting between the longitudinal fluid passage and the second longitudinal fluid passage. W1b is formed between the upper lid portion 5 and the middle lid portion 4. The flow hole h also serves as an electrolyte injection hole, and one width direction facing surface of each exhaust chamber located on the side of one longitudinal direction Sc of each exhaust chamber and the second longitudinal direction fluid passage L2. It is provided so as to be positioned in the vicinity of one corner portion C1 formed between Sa.

  Each exhaust chamber has one end at the other corner portion C4 extending in the width direction of the inner lid portion 4 along the other longitudinal facing surface Sd of each exhaust chamber and at a diagonal position of the one corner portion C1. An exhaust chamber widthwise fluid passage W2 having an opening and the other end opened in the second longitudinal fluid passage L2 is formed between the other longitudinally facing surface Sd of each exhaust chamber and a fluid passage forming wall portion 26. And in the vicinity of the opening at one end of the exhaust passage width direction fluid passage W2 (near the corner portion C4), the fluid passage forming wall portion 26 is integrated with the one of each exhaust chamber from the fluid passage forming wall portion 26. A partition wall portion 27 that protrudes toward the longitudinally facing surface Sc and ends at the front end of the one longitudinally facing surface Sc is provided in an integrated state with the inner lid portion 4 and the upper lid portion 5. Electrolyte storage space between the partition wall 27 of each exhaust chamber and one width direction facing surface Sa of each exhaust chamber There is formed, the end position of the tip of the partition wall portion 27 so as to position at least a portion of the flow hole h in the electrolyte accommodation space A is set.

  In the above lead storage battery, the gas flowing out from each cell chamber through the flow hole h into the corresponding exhaust chamber passes through the space in the exhaust chamber and the fluid passage W2 in the exhaust chamber width direction, and the other end in the width direction of the inner lid portion 4. After flowing into the second longitudinal fluid passage L2 on the side, the fluid flows into the first longitudinal fluid passage L1 on one end side in the width direction of the inner lid portion through the inter-exhaust chamber width direction fluid passages W1a and W1b. The gas flowing into the first longitudinal fluid passage L1 reaches the concentrated exhaust chambers E1 and E2, and is discharged to the outside through the exhaust port from the concentrated exhaust chamber.

  As described above, the flow hole h is provided in the vicinity of one corner portion C1 of each exhaust chamber, and the opening to the exhaust chamber of the exhaust chamber widthwise fluid passage W2 connecting the exhaust chamber and the fluid passage outside the exhaust chamber is circulated. If the structure is provided at the diagonal position of the hole h, as will be described later, when the battery case falls down, the amount of the electrolyte flowing out from the cell chamber to the exhaust chamber can be reduced. The probability that the electrolyte that has flowed out flows out of the exhaust chamber can be reduced. Therefore, it is possible to reduce the possibility that the electrolyte solution flows out to the outside when the battery case falls down, and to reduce the possibility that the periphery of the battery is soiled with the electrolyte solution. In addition, when the battery case falls down, a large amount of electrolyte does not flow out from each exhaust chamber, and in most cases, the electrolyte flowing out from each cell chamber into each exhaust chamber can be retained in each exhaust chamber, When the fallen battery case is returned to a normal state, almost all of the electrolyte that has flowed out of each cell chamber when it falls down can be returned to the original cell chamber. It is possible to prevent the amount of electrolyte in the cell chamber from becoming uneven.

  Further, as described above, if the flow hole provided in the bottom wall portion of each exhaust chamber is also used as the electrolyte injection hole, it is not necessary to provide many holes in the bottom wall portion of the exhaust chamber. Unlike conventional lead-acid batteries that have an electrolyte solution return hole and an electrolyte solution injection hole, it is not necessary to provide many partition walls and cylindrical parts in each exhaust chamber. Simplification can be achieved.

  If the structure of the inner lid part and the upper lid part can be simplified, the structure of the mold used when molding the inner lid part and the upper lid part can be simplified and the cost can be reduced. Cost can be reduced. In addition, if the structure of the inner lid part and the upper lid part can be simplified, the pattern of the joint part of the inner lid part and the upper lid part can be simplified, so that the joining of the inner lid part and the upper lid part can be easily performed. It is possible to prevent the product yield from being deteriorated due to failure in joining the middle lid portion and the upper lid portion.

(Second invention)
The second invention is applied to the first invention. In the present invention, the battery case overturns in a state where any one end in the longitudinal direction thereof is down, and the flow hole in each exhaust chamber Electrolyte solution so that all the electrolyte solution flowing out from the cell chamber into the exhaust chambers through the flow holes can be accommodated in the electrolyte solution accommodating space A when the gas is positioned above the fluid passage W2 in the exhaust chamber width direction. The volume of the accommodation space A is set.

  When the volume of the electrolytic solution storage space is set in this way, the battery case falls over with one end in the longitudinal direction down, and the flow hole in each exhaust chamber becomes a fluid in the width direction of the exhaust chamber. When it becomes a state located above a channel | path, all the electrolyte solution which flows out into each exhaust chamber through a flow hole from a cell chamber is accommodated in the electrolyte solution storage space A, and the electrolyte solution which flowed in into the electrolyte solution storage space Does not flow beyond the tip of the partition wall 27 into the exhaust passage width direction fluid passage W2. Therefore, the battery case overturns with its end in the longitudinal direction down, and the flow hole in each exhaust chamber is positioned above the opening of the exhaust chamber width direction fluid passage W2 into the exhaust chamber. Thus, even when the electrolyte in the exhaust chamber is most likely to flow out to the outside, the electrolyte flows out from each exhaust chamber through the fluid passage in the width direction of the exhaust chamber into the second longitudinal fluid passage L2. Can be prevented.

(Third invention)
The third invention is applied to the first or second invention. In the present invention, each of the exhaust chambers protrudes from one longitudinal facing surface Sc of each exhaust chamber at a position closer to the partition wall 27 side than the circulation hole h, and the inside of the electrolytic solution containing space A is a fluid passage forming wall. A barrier portion 28 extending toward the portion 26 is further provided integrally with the middle lid portion 4 and the upper lid portion 5. The barrier portion 28 is provided in an inclined state toward the corner portion C2 formed between the other longitudinal direction facing surface Sd and the one width direction facing surface Sa of each exhaust chamber, and the tip thereof is a fluid passage. It is terminated at a position in front of the forming wall portion 26.

(Fourth invention)
The fourth invention is applied to the third invention. In the present invention, the fourth invention protrudes from the position before the tip of the partition wall portion 27 toward the barrier portion 28 and terminates at the position before the barrier portion 28. 1 projecting wall portion 29 and a second projecting portion projecting from a position before the front end of the barrier portion 28 toward one width direction facing surface Sa of each exhaust chamber and terminating at a position before one width direction facing surface. The wall portion 30 is further provided integrally with the inner lid portion 4 and the upper lid portion 5.

(Fifth invention)
The fifth invention is applied to any one of the first to fourth inventions. In the present invention, the upper surface of the bottom wall portion of each exhaust chamber is inclined so as to gradually decrease from the vicinity of the opening at one end of the exhaust chamber width direction fluid passage W2 toward the flow hole h, The bottom surface of the first longitudinal fluid passage L1 is inclined so as to gradually become lower toward the portion where the inter-exhaust chamber width direction fluid passages W1a, W1b and the first longitudinal fluid passage L1 meet. It is done. Further, the bottom surfaces of the widthwise fluid passages W1a and W1b between the exhaust chambers are inclined so as to gradually become lower from the first longitudinal fluid passage L1 side toward the second longitudinal fluid passage L2 side. The bottom surface of the second longitudinal fluid passage L2 faces the portion where the opening at the other end of the exhaust chamber widthwise fluid passage W2 provided in each exhaust chamber meets the second longitudinal fluid passage L2. The slope is gradually lowered.

(Sixth invention)
The sixth invention is applied to any one of the first to fifth inventions. In the present invention, the concentrated exhaust chamber is provided at a position near one end and the other end in the longitudinal direction of the inner lid portion, and one end and the other end of the first longitudinal fluid passage are respectively the longitudinal length of the inner lid portion. It communicates with a centralized exhaust chamber provided at a position near one end and a position near the other end in the direction.

(Seventh invention)
The seventh invention is applied to any one of the first to sixth inventions. In the present invention, the lead storage battery is provided with 2n cell chambers (n is an integer of 2 or more). . In the present invention, the second longitudinal fluid passage L2 is partitioned by the partition wall 25 into the first portion L2a and the second portion L2b at a position that bisects the inner lid portion 4 in the longitudinal direction. Two exhaust passage width direction fluid passages are provided, and one of the exhaust chamber width direction fluid passages W1a is connected to the first longitudinal fluid passage L1 and the first portion L2a of the second longitudinal fluid passage L2. Between the first longitudinal fluid passage L1 and the second portion L2b of the second longitudinal fluid passage L2. The other exhaust chamber widthwise fluid passage W1b is provided between the first longitudinal fluid passage L1 and the second portion L2b of the second longitudinal fluid passage L2. .

(Eighth invention)
The eighth invention is applied to the seventh invention. In the present invention, the n exhaust chambers arranged near one end in the longitudinal direction of the inner lid portion 4 have one longitudinal facing surface. Are positioned on one end side in the longitudinal direction of the inner lid portion, and the other n exhaust chambers arranged near the other end in the longitudinal direction of the inner lid portion have one longitudinal facing surface in the middle. It is provided in a state of being positioned on the other end side in the longitudinal direction of the lid portion.

(9th invention)
9th invention has shown the preferable structure in the case of applying this invention to the lead acid battery which has the general structure by which the six cell chambers are provided in the battery case 1. FIG. The lead storage battery to which the present invention is applied has a battery case body 2 that is formed in a substantially rectangular parallelepiped shape as a whole and a lid portion 3 that closes an opening at the upper end of the battery case body. The battery case 1 is provided with the direction along the long side and the direction along the short side as the longitudinal direction and the width direction, respectively, and in the battery case, from one end side to the other end side in the longitudinal direction of the battery case. First to sixth cell chambers arranged in order are formed. Also in this case, there is an inner lid portion 4 that extends between one end and the other end in the longitudinal direction of the battery case 1 and has a direction along the longitudinal direction and a direction along the width direction of the battery case as the longitudinal direction and the width direction, respectively. An upper lid portion 5 is joined to the middle lid portion 4 provided on a part of the lid portion 3. Independent first to sixth exhaust chambers D1 to D6 corresponding to the first to sixth cell chambers are formed between the middle lid portion 4 and the upper lid portion 5, and the cells corresponding to the respective exhaust chambers are formed. A flow hole is provided in the bottom wall portion of each exhaust chamber partitioning between the chambers so as to communicate between each cell chamber and the exhaust chamber. In addition, first and second concentrated exhaust chambers E1 and E2 are provided between the middle lid portion 4 and the upper lid portion 5 at positions near one end and the other end in the longitudinal direction of the battery case, respectively. The first to sixth exhaust chambers are communicated with the first and second concentrated exhaust chambers, and the first and second concentrated exhaust chambers are opened to the outside through the exhaust port 35.

  Even when the present invention is applied to such a lead storage battery, each exhaust chamber has a pair of width direction facing surfaces Sa and Sb opposed to the width direction of the inner lid portion 4 and a pair opposed to the longitudinal direction of the inner lid portion. The four corners C1 to C4 are formed in each exhaust chamber. And it is provided so that the outer side of the 1st thru | or 6th exhaust chamber may be extended along the longitudinal direction of an inner cover part at the one end side of the width direction of an inner cover part, and an end and the other end are 1st and 2nd, respectively. The first longitudinal fluid passage L1 connected to the concentrated exhaust chambers E1 and E2 and the first to sixth exhaust chambers D1 to D6 on the other end side in the width direction of the inner lid portion are connected to the longitudinal direction of the inner lid portion. The first longitudinal fluid passage L1 and the second longitudinal passage through the second longitudinal fluid passage L1 provided so as to extend in the direction between the second exhaust chamber D2 and the third exhaust chamber D3. The first longitudinal fluid passage L1 and the first longitudinal fluid passage L1 pass through between the first exhaust chamber width direction fluid passage W1a connecting the directional fluid passage L2 and between the fourth exhaust chamber D4 and the fifth exhaust chamber D5. Between the upper lid portion 5 and the middle lid portion 4 is a second fluid passage width fluid passage W1b between the exhaust chambers that connects the two longitudinal fluid passages L2. It is made.

  The flow hole h also serves as an electrolyte injection hole, and one longitudinal direction opposing surface Sc of each exhaust chamber and one width direction opposing surface Sc of each exhaust chamber located on the second longitudinal fluid passage side. Are provided in the vicinity of one corner portion C1 formed between the two.

  In each exhaust chamber, one end opens to the other corner portion C4 extending in the width direction of the inner lid portion 4 along the other longitudinal facing surface of each exhaust chamber and at a diagonal position of the one corner portion C1. A fluid passage forming wall portion 26 that forms an exhaust chamber width direction fluid passage W2 having the other end opened in the second longitudinal fluid passage L2 and the other longitudinal facing surface Sd of each exhaust chamber; The fluid passage forming wall portion 26 is integrated in the vicinity of the opening at one end of the exhaust passage width direction fluid passage 26 and from the fluid passage forming wall portion 26 to the one longitudinal facing surface Sc side of each exhaust chamber. A partition wall portion 27 that protrudes and ends at a position in front of the one longitudinally opposite surface is provided in an integrated state with the middle lid portion 4 and the upper lid portion 5, and the partition wall portion 27 of each exhaust chamber An electrolyte accommodating space A is formed between the one facing surface in the width direction and the flow holes h in each exhaust chamber are formed. Without even the end position of the tip of the partition wall portion 27 of the exhaust chamber so as to position the part in the electrolytic liquid storage space A is set.

(Tenth invention)
The tenth aspect of the invention is applied to the ninth aspect of the invention. In the present invention, the battery case overturns in a state where any one end in the longitudinal direction thereof is down, and the flow hole in each exhaust chamber So that all the electrolyte flowing out from the cell chamber through the flow holes into the respective exhaust chambers can be accommodated in the electrolyte accommodating space A when it is positioned above the fluid passage in the width direction of the exhaust chamber. The volume of the electrolytic solution storage space A is set.

(Eleventh invention)
The eleventh aspect of the invention is applied to any of the ninth to tenth aspects of the invention. In the present invention, each exhaust chamber is located in the exhaust chamber at a position closer to the partition wall 27 than the flow hole h. A barrier portion 28 that is integrated with one longitudinal facing surface Sc and protrudes from the one longitudinal facing surface and extends in the electrolyte accommodating space A toward the fluid passage forming wall portion 26 is provided with an inner lid portion 4 and an upper lid portion. 5 is further provided. The barrier portion 28 is provided in an inclined state toward the corner portion C2 formed between the other longitudinal direction facing surface Sd and the one width direction facing surface Sa of each exhaust chamber, and the tip thereof is a fluid passage. It is terminated at a position in front of the forming wall portion 26.

(Twelfth invention)
The twelfth invention is applied to any of the ninth to eleventh inventions. In the present invention, the second longitudinal fluid passage L2 includes the third exhaust chamber D3 and the fourth exhaust. The partition wall 25 provided at the boundary with the chamber D4 is divided into a first portion L2a and a second portion L2b, and the first and second exhaust chamber widthwise fluid passages W1a and W1b are respectively Provided between the second exhaust chamber D2 and the third exhaust chamber D3, and between the fourth exhaust chamber D4 and the fifth exhaust chamber D5.

(13th invention)
The thirteenth invention is applied to any of the eighth to twelfth inventions. In the present invention, the first to third exhaust chambers D1 to D3 are respectively provided with one longitudinal facing surface Sc. Are disposed in the longitudinal direction of one end 4c of the inner lid portion 4, and the fourth to sixth exhaust chambers D4 to D6 have their respective longitudinal facing surfaces Sc in the longitudinal direction of the inner lid portion. It is provided in a state of being positioned on the other end 4d side.

(14th invention)
The fourteenth invention is applied to any one of the first to thirteenth inventions. In the present invention, the flow hole is a single hole.

(15th invention)
The fifteenth aspect of the invention is applied to any one of the first to thirteenth aspects of the invention, and in the present invention, the flow hole is composed of an assembly of a plurality of holes.

  According to the present invention, the first and second longitudinal fluid passages extending in the longitudinal direction of the middle lid portion are formed on both sides in the width direction of the series of exhaust chambers formed side by side along the longitudinal direction of the middle lid portion. The first longitudinal fluid passage is connected to the concentrated exhaust chamber provided at the end of the inner lid portion, and the two longitudinal fluid passages are connected to each other through the widthwise fluid passage between the exhaust chambers. An exhaust chamber fluid passage having a flow hole for communicating the exhaust chamber with the cell chamber in the vicinity of one corner portion and having an opening to the exhaust chamber at another corner portion at a diagonal position of the one corner portion Is provided in the exhaust chamber, and each exhaust chamber is connected to the second longitudinal fluid passage through the exhaust chamber width direction fluid passage, so that when the battery case falls down, the cell chamber passes through the flow hole. Reduce the amount of electrolyte flowing into the exhaust chamber In addition, the probability of the electrolyte flowing out of the exhaust chamber flowing out of the exhaust chamber is reduced, so that in most cases, the electrolyte flowing out of each cell chamber can be retained in each exhaust chamber when the battery falls down. Even if there is an electrolyte flowing out from each exhaust chamber, the amount can be suppressed to a slight amount. Moreover, in the present invention, the length of the fluid passage from each exhaust chamber to the central exhaust chamber is increased by effectively using the space in the longitudinal direction and the space in the width direction of the inner lid portion and the upper lid portion. Since it took time for the electrolyte that flowed out to reach the central exhaust chamber, the battery case was shaken when the battery case collapsed, or the battery case fell over its top surface, Even if the electrolytic solution flows out from the exhaust chamber, the probability that the electrolytic solution reaches the central exhaust chamber before the battery case is returned to the normal posture can be reduced. Therefore, according to the present invention, when the battery is accidentally brought down during transportation of the battery, the risk of the electrolyte flowing out from the battery case can be reduced, and the periphery of the battery is soiled with the electrolyte. The fear can be reduced. Further, according to the present invention, when the battery falls, the electrolyte hardly flows out from each exhaust chamber. When the fallen battery is returned to a normal state, the exhaust from each cell chamber when the battery falls. Since almost all of the electrolyte flowing out into the chamber can be returned to the original cell chamber, it is possible to prevent the amount of electrolyte in the series of cell chambers provided in the battery case from becoming uneven.

  In the present invention, the flow hole provided in the bottom wall portion of each exhaust chamber is also used as the electrolyte injection hole, so that it is not necessary to provide many holes in the bottom wall portion of the exhaust chamber, Unlike the conventional lead storage battery in which the liquid reflux hole and the electrolyte injection hole are provided, it is not necessary to provide many partition walls and cylindrical portions in each exhaust chamber. Accordingly, it is possible to simplify the structure of the inner lid portion and the upper lid portion, to simplify the structure of the mold used when forming the middle lid portion and the upper lid portion, and to reduce the manufacturing cost. .

  Furthermore, according to the present invention, the structure of the inner lid portion and the upper lid portion can be simplified, and the pattern of the joint portion between the inner lid portion and the upper lid portion can be simplified. Joining can be easily performed, and it is possible to prevent the yield of products from being deteriorated due to failure in joining the inner lid portion and the upper lid portion.

  In particular, according to the invention described in claim 2 or claim 10, except for a special case where the battery falls down with its upper surface down or is intentionally shaken or tilted in the fall state, Regardless of the positional relationship between the flow holes in the exhaust chambers and the fluid passages in the exhaust chamber width during the fall, the electrolyte flowing out from the cell chambers into the exhaust chambers flows into the exhaust chambers in the width direction of the exhaust chambers. Since it can be prevented from flowing out of each exhaust chamber through the passage, not only can the electrolyte reach the central exhaust chamber and leak to the outside, but it can also be returned to a normal posture after the battery is defeated. At that time, all the electrolyte flowing out from each cell chamber into the exhaust chamber is returned to the original cell chamber through the flow holes, and the amount of the electrolyte in the series of cell chambers provided in the battery case becomes uneven. Can be prevented.

It is a disassembled perspective view of the lead acid battery concerning one Embodiment of this invention. It is a top view in the state where the upper cover part of a lead storage battery concerning the embodiment was removed. It is sectional drawing along the III-III line of FIG. It is sectional drawing of the concentration exhaust chamber vicinity of the lead storage battery concerning the embodiment. It is a top view in the state where the upper cover part used with the lead storage battery concerning the embodiment was turned over. It is the top view which showed the modification of the flow hole provided in each exhaust chamber in embodiment of this invention.

  Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. In FIG.1 and FIG.2, 1 has shown the battery case of the lead storage battery. The illustrated battery case 1 includes a battery case body 2 which is formed so as to have a substantially rectangular parallelepiped shape and whose upper end is opened, and a lid portion 3 which closes an opening portion at the upper end of the battery case body 2. Although not shown, the inside of the battery case 1 is partitioned by cell spacing walls into first to sixth cell chambers that are sequentially arranged from one end to the other end in the longitudinal direction. In this specification, the direction along the long side and the direction along the short side of the rectangular cross section of the battery case body 2 are defined as the longitudinal direction and the width direction of the battery case, respectively.

  A part of the lid portion 3 is provided with a substantially rectangular inner lid portion 4 extending between one end and the other end in the longitudinal direction of the battery case 1. In this specification, the direction along the longitudinal direction (horizontal direction of FIG. 2) and the width direction (vertical direction of FIG. 2) of the battery case among the respective directions along the four sides of the inner lid portion 4 is respectively set to the inner lid portion 4. It is set as the longitudinal direction and the width direction.

  The illustrated inner lid portion 4 has one end 4a in the width direction (vertical direction in FIG. 2) positioned near one end 3a in the width direction of the lid portion 3 (width direction of the battery case), and the other end 4b in the width direction. Is positioned near the center of the lid 3 in the width direction, and one end 4c and the other end 4d in the longitudinal direction are positioned near one end 3c and 3d in the longitudinal direction of the lid 3 (longitudinal direction of the battery case), respectively. It is provided in the state. In the illustrated example, in order to enlarge the width dimension of the portion near the one end in the longitudinal direction and the portion near the other end of the inner lid portion 4, one end in the width direction rather than the portion near the center in the longitudinal direction of the inner lid portion 4. Protruding portions 401 and 402 protruding to the side are formed.

  An upper lid portion 5 (see FIG. 5) is placed on the middle lid portion 4, and the upper lid portion 5 is joined to the middle lid portion 4 by heat welding. A circumferential wall portion 20 extending along the outer peripheral edge is formed on the upper surface of the middle lid portion 4, and a middle lid portion-side concave portion is formed inside the circumferential wall portion 20. The upper lid portion 5 has the same contour shape as that of the inner lid portion 4, and projects in the width direction at one end side and the other end side in the longitudinal direction, like the projecting portions 401 and 402 of the inner lid portion 4. Protruding portions 501 and 502 are formed. Also on the lower surface of the upper lid portion 5, a peripheral wall portion 20 extending along the outer peripheral edge thereof is formed, and an upper lid portion-side concave portion is formed inside the peripheral wall portion 20. The inner lid portion 4 and the upper lid portion 5 are joined in a state where the respective peripheral wall portions 20 are combined, and the middle lid portion 4 and the upper lid portion 5 are evacuated between the middle lid portion 4 and the upper lid portion 5 by the concave portion on the middle lid portion and the concave portion on the upper lid portion. A space for forming the chamber is formed. In the illustrated example, an outer wall portion 21 that surrounds the outer side of the peripheral wall portion 20 is formed on the lower surface of the upper lid portion 5.

  When the upper lid portion 5 shown in FIG. 5 is disposed on the middle lid portion 4, one end 5 a and the other end 5 b in the width direction of the upper lid portion 5 are respectively connected to one end 4 a in the width direction of the middle lid portion 4 and the other. The ends 5b and 5d of the upper lid 5 are arranged so as to coincide with the ends 4b and 4d and 4d of the middle lid 4 in the longitudinal direction.

  A hollow projecting portion 6 projecting upward is formed at the center portion of the lid portion 3 in the longitudinal direction so as to be positioned between the middle lid portion 4 and the other end 3b of the lid portion 3 in the width direction. An indicator mounting hole 7 is formed in a part of the portion 6. The indicator mounting hole 7 is used for mounting an indicator (not shown) that displays the liquid level of the electrolytic solution in the battery case. In the illustrated example, an indicator mounting hole 7 is provided above the fifth cell chamber among the first to sixth cell chambers provided in the battery case body 2, so that the electrolysis in the fifth cell chamber is performed. An indicator for displaying the liquid level of the liquid is attached to the indicator attachment hole 7. In this embodiment, the liquid level of the electrolytic solution in the fifth cell chamber is displayed on the indicator as a representative, thereby estimating the liquid level of the electrolytic solution in another cell chamber.

  Bosses 8 and 9 made of lead alloy are embedded in positions close to the one end 3c and the other end 3d in the longitudinal direction of the lid 3 and closer to the other end 3b in the width direction of the lid 3, respectively. The positive electrode column 11 raised from the strap connecting the ears of the positive electrode plates of the electrode plate group accommodated in the first cell chamber and the negative electrode plate of the electrode plate group accommodated in the sixth cell chamber The negative poles 12 raised from the straps connecting the ears are led out through the bosses 8 and 9, respectively.

  First to sixth exhaust chambers D1 to D6 are formed in the space between the middle lid portion 4 and the upper lid portion 5 so as to be positioned on the first to sixth cell chambers, respectively. These exhaust chambers are formed by mutually joining predetermined pattern wall portions 22 formed with a uniform plate thickness inside the peripheral wall portion 20 of the inner lid portion 4 and the upper lid portion 5.

  In the present embodiment, a part of the exhaust chambers D1 and D6 is partitioned by a partition wall portion 22a formed in a part of the wall portion 22 provided in the inner lid portion and the upper lid portion, thereby the longitudinal direction of the inner lid portion. Concentrated exhaust chambers E1 and E2 are formed on one end side and the other end side, respectively.

  Each exhaust chamber has a pair of width direction facing surfaces Sa, Sb facing in the width direction of the inner lid portion and a pair of length direction facing surfaces Sc, Sd facing in the longitudinal direction of the inner lid portion, Four corner portions C1 to C4 are formed in each exhaust chamber.

  The three exhaust chambers D1 to D3 arranged near one end in the longitudinal direction of the inner lid portion 4 are provided in a state where one longitudinal facing surface Sc is positioned on one end side in the longitudinal direction of the inner lid portion. The other three exhaust chambers D4 to D6 arranged near the other end in the longitudinal direction of the inner lid portion 4 have one longitudinal direction opposing surface Sc on the other end side in the longitudinal direction of the inner lid portion 4. It is provided in the state where it was located in.

  The exhaust chambers D1 to D6 are formed in a substantially square shape, but the exhaust chambers D1 and D6 arranged at both ends in the longitudinal direction of the inner lid portion are formed with concentrated exhaust chambers E1 and E2 in a part of each. As a result, one of the longitudinal facing surfaces Sc has a deformed shape.

  As described above, the exhaust chambers D1 to D6 and the concentrated exhaust chambers E1 and E2 are formed between the middle lid portion 4 and the upper lid portion 5, and as will be described later, the exhaust chambers D1 to D6 are provided. Various fluid passages for connection to the central exhaust chambers E1 and E2 are formed. These are configured by wall portions 22 that are respectively provided on the inner lid portion 4 and the upper lid portion 5 and joined to each other. In the following description, mainly using the drawings showing the inner lid portion, the inner lid portion and the upper lid are used. The structure of the structure provided between the parts will be described. The pattern of the wall part provided in each of the middle cover part and the upper cover part to form the exhaust chamber and the fluid passage has a mirror image relationship.

  Between the middle lid portion 4 and the upper lid portion 5, the outer sides of the exhaust chambers D 1 to D 6 extend along the longitudinal direction of the middle lid portion on one end 4 a side in the width direction of the middle lid portion 4, and one end and the other end. Are connected to the concentrated exhaust chambers E1 and E2, respectively, and the outside of the exhaust chambers D1 to D6 on the other end 4b side in the width direction of the inner lid 4 along the longitudinal direction of the battery case. The first longitudinal fluid passage L2 extending in the width direction of the inner lid portion extends between the specific adjacent exhaust chambers D2, D3 and D4, D5 selected from the exhaust chamber. Two widthwise fluid passages W1a and W1b between the exhaust chambers connecting the directional fluid passage L1 and the second longitudinal fluid passage L2 are formed.

  The first longitudinal fluid passage L1 is provided on one end side in the width direction of the inner lid portion 4 so as to extend linearly between the exhaust chambers D1 to D6 and the peripheral wall portion 20, and extends in the longitudinal direction. On one end side and the other end side, enlarged portions L11 and L12 whose width dimensions are enlarged at the protruding portions 401 and 402 of the inner lid portion 4 are formed, respectively, and the end portions of these enlarged portions L11 and L12 are exhausted, respectively. The central exhaust chambers E1 and E2 are connected through flow paths 23 and 24 formed between the chambers D1 and D6 and the peripheral wall portion 20.

  The second longitudinal fluid passage L2 is provided on the other end side in the width direction of the inner lid portion 4 so as to extend linearly between the exhaust chambers D1 to D6 and the peripheral wall portion 20. In the present embodiment, the second longitudinal fluid passage L2 is partitioned into a first portion L2a and a second portion L2b by a partition wall 25 provided in the central portion of the inner lid portion 4 in the longitudinal direction, One longitudinal fluid passage L1 is connected to the first portions L2a and L2b of the second longitudinal fluid passage L2 through the inter-exhaust width fluid passages W1a and W1b.

  As shown in FIG. 2, a flow hole h having a size that also serves as an electrolyte injection hole is provided through the bottom wall portion of each exhaust chamber partitioning between each exhaust chamber and the corresponding cell chamber. ing. In the present embodiment, the flow hole h is located between one longitudinal facing surface Sc of each exhaust chamber and one width facing surface Sa of each exhaust chamber located on the second longitudinal fluid passage L2 side. Only one corner portion C1 is formed, and only one is provided in each exhaust chamber. The first to sixth exhaust chambers D1 to D6 are connected to the first to sixth cell chambers through the flow holes h provided in the respective bottom walls.

  Each exhaust chamber is provided with a fluid passage forming wall portion 26 extending along the other longitudinal facing surface Sd of each exhaust chamber, and between the fluid passage forming wall portion 26 and the longitudinal facing surface Sd. The exhaust chamber extends in the width direction of the inner lid portion 4 and has one end opened in the other corner portion C4 at the diagonal position of one corner portion C1, and the other end opened in the second longitudinal fluid passage L2. A width direction fluid passage W2 is formed.

  Each exhaust chamber is also integrated with the fluid passage forming wall portion 26 near the opening at one end of the exhaust passage widthwise fluid passage W2 (near the corner portion C4). In a state in which the partition portion 27 protruding toward one longitudinal facing surface Sc of the exhaust chamber and having the tip terminated at a position before the one longitudinal facing surface Sc is integrated with the middle lid portion 4 and the upper lid portion 5. An electrolyte solution accommodating space A is formed between the partition wall portion 27 and one of the width direction facing surfaces Sa. The end position of the tip of the partition wall portion 27 is set so that at least a part of the flow hole h is positioned in the electrolytic solution housing space A.

  In the present embodiment, the battery case 1 is overturned with one end of the longitudinal direction thereof facing down, and the flow hole h in each exhaust chamber is positioned above the fluid passage W2 in the exhaust chamber width direction. The volume of the electrolytic solution housing space A is set so that all the electrolytic solution flowing out from the cell chamber into the exhaust chambers through the flow holes h can be stored in the electrolytic solution housing space A.

  Further, in each exhaust chamber, it protrudes from one longitudinal facing surface Sc of each exhaust chamber at a position closer to the partition wall 27 side than the flow hole h, and the inside of the electrolytic solution housing space A is on the fluid passage forming wall 26 side. A barrier portion 28 extending in the middle is provided integrally with the inner lid portion 4 and the upper lid portion 5. The barrier portion 28 is provided in a state of being inclined toward the corner portion C2 formed between the other longitudinal facing surface Sd and one widthwise facing surface Sa of each exhaust chamber, It is terminated at a position in front of the fluid passage forming wall portion 26.

  In the present embodiment, the first protruding wall portion 29 that protrudes from the position in front of the front end of the partition wall portion 27 toward the barrier portion 28 along the width direction of the exhaust chamber and ends at the position in front of the barrier portion 28; A second protruding wall portion 30 that protrudes from the position in front of the front end of the barrier portion 28 toward the one width direction facing surface Sa of each exhaust chamber and ends at a position in front of the one width direction facing surface Sa is an inner lid. And an upper lid portion are further provided.

  The upper surface of the bottom wall portion of each exhaust chamber is inclined so as to gradually decrease from the vicinity of the opening at one end of the exhaust chamber width direction fluid passage W2 toward the flow hole h in the first longitudinal direction. The bottom surface of the fluid passage L1 is inclined so as to gradually become lower toward a portion where the fluid passages W1a, W1b between the exhaust chambers and the first longitudinal fluid passage L1 meet each other. The bottom surfaces of the widthwise direction fluid passages W1a and W1b are inclined so as to gradually decrease from the first longitudinal fluid passage L1 side toward the second longitudinal fluid passage L2 side. Further, the bottom surface of the second longitudinal fluid passage L2 is inclined so as to gradually decrease toward the opening at the other end of the exhaust chamber widthwise fluid passage W2 provided in each exhaust chamber. . In FIG. 2, the inclination of each of the above parts is indicated by arrows. Each arrow indicates that the front end side is lower than the rear end side.

  If each part is provided with an inclination as described above, the electrolyte solution in each fluid passage can be moved toward each exhaust chamber when the battery case is brought down and then returned to a normal posture. The electrolyte that has flowed out into each fluid passage can be returned smoothly and quickly into each exhaust chamber.

  As shown in FIGS. 4 and 5, exhaust ports 35 for opening the central exhaust chambers E1 and E2 to the outside are formed at one end and the other end of the upper lid portion 5 in the longitudinal direction. Explosion-proof filters 36 and 37 are accommodated in the central exhaust chambers E 1 and E 2, and exhaust gas flowing into the central exhaust chambers through the first longitudinal fluid passage L 1 passes through the filters 36 and 37 and the exhaust port 35 to the outside. It is supposed to be discharged.

  In the present embodiment, a liquid injection port 40 is formed in the upper lid portion 5. The liquid injection port 40 is provided at a position aligned with the flow hole h in each exhaust chamber, and a screw for attaching a plug is formed on the inner periphery thereof. In the cross-sectional view of FIG. 3, the portion denoted by reference numeral 41 is welded to the upper end of the partition wall that partitions the cell chambers in the battery case body when the lid 3 is attached to the battery case body 2. It is a partition part which forms a cell chamber space | interval wall with the partition on the side. Further, the portion denoted by reference numeral 42 is engaged with the side surface of the upper end of the partition between the cell chambers on the battery case body side when the partition 41 is welded to the upper end of the partition between the cell chambers of the battery case body 2. These are positioning ribs for positioning the partition wall portion 41 with respect to the partition wall on the battery case main body side.

  The lead storage battery of the present embodiment has a partition wall that accommodates electrode plate groups in each cell chamber of the battery case body 2 and separates the positive electrode straps and the negative electrode straps of the electrode plate groups in adjacent cell chambers from each other between the cell chambers. After connecting through the inter-cell connecting portion that has penetrated, the liquid cover is assembled by attaching the lid portion 3 having the upper lid portion 5 attached to the inner lid portion 4 to the upper end of the battery case body 2, and the liquid injection provided in the upper lid portion 5 An electrolyte is injected into each cell chamber through the opening 40 and the flow hole h in each exhaust chamber. After injecting the electrolyte into each cell chamber, the liquid inlet 40 is closed with a stopper to complete the battery.

  In the above lead storage battery, when the gas pressure in the first to sixth cell chambers rises, the gas flowing out from these cell chambers through the flow holes h into the first to sixth exhaust chambers is And the exhaust chamber width direction fluid passage W2 provided in each exhaust chamber, and then flows into the second longitudinal fluid passage L2 on the other end 4b side in the width direction of the inner lid portion 4 and then between the exhaust chambers. It flows into the first longitudinal fluid passage L1 on the side of one end 4a in the width direction of the middle lid portion through the width direction fluid passages W1a and W1b. The gas flowing into the first longitudinal fluid passage L1 reaches the concentrated exhaust chambers E1 and E2, and is discharged to the outside through the exhaust port 35 from these concentrated exhaust chambers.

  When the battery case 1 falls, the electrolyte flows out from the cell chamber through the flow hole h into the corresponding exhaust chamber. As for the normal way to collapse the battery case, the battery case falls down with one end in the width direction down, and the case where the battery case falls down with either end in the longitudinal direction down You could think so. First, it is assumed that the battery case falls down with its end in the width direction downward, and the flow holes in each exhaust chamber are positioned below the first longitudinal fluid passage. At this time, the electrolyte solution flows out from each cell chamber into the exhaust chamber through the circulation hole h. However, since the air in the cell chamber is not replaced, the space above the electrolyte surface in the cell chamber with the outflow of the electrolyte solution. Becomes a negative pressure, and when the negative pressure balances with the head pressure of the electrolyte in the cell chamber, the outflow of the electrolyte stops. At this time, the liquid level of the electrolyte in the exhaust chamber does not exceed the level of the electrolyte in the cell chamber. Therefore, unless the battery case is intentionally shaken or tilted, the flow hole h The electrolyte does not reach the opening of the exhaust chamber width direction fluid passage W2 at the diagonal position of the exhaust chamber into the exhaust chamber, and the electrolyte flows out from each exhaust chamber into the second longitudinal fluid passage L2. Absent. When the battery case is returned to a normal posture after being defeated, the electrolyte solution in each exhaust chamber returns to the original cell chamber through the flow hole h, so that the level of the electrolyte solution in the series of cell chambers provided in the battery case is There will be no unevenness.

  Next, consider a case where the battery case falls down with its end in the width direction down, and the flow hole h in each exhaust chamber is positioned above the first longitudinal fluid passage L1. At this time, the electrolyte in each cell chamber flows out into the corresponding exhaust chamber through the flow hole h. However, when the liquid level of the electrolyte in the cell chamber reaches the level at the lower end of the flow hole h, The electrolyte outflow stops. When the electrolyte flowing out into the exhaust chamber flows into the exhaust chamber width direction fluid passage W2, the electrolyte rises in the exhaust chamber width direction fluid passage W2, but the second longitudinal fluid passage L2 of the exhaust chamber width direction fluid passage W2 is used. Since the opening to the inside is at a position higher than the liquid level of the electrolytic solution in the cell chamber, the electrolytic solution does not reach the second longitudinal fluid passage L2. Therefore, also in this case, the electrolyte does not flow out from each exhaust chamber into the second longitudinal fluid passage L2, and when the battery case is brought down and returned to a normal state, all the electrolyte in each exhaust chamber is discharged. Since it returns to a corresponding cell chamber through a flow hole, the level of the electrolyte solution in a series of cell chambers does not become non-uniform.

  Next, consider the case where the battery case 1 falls over with its longitudinal end facing downward, and the flow hole h in the exhaust chamber is located below the fluid passage W2 in the exhaust chamber width direction. In this case as well, the electrolyte flows out from each cell chamber into the exhaust chamber through the circulation hole h. However, since the air in the cell chamber is not replaced, the electrolyte solution is located above the electrolyte surface in the cell chamber as the electrolyte flows out. When the space becomes negative pressure and this negative pressure balances with the head pressure of the electrolyte in the cell chamber, the outflow of the electrolyte stops. At this time, since the liquid level of the electrolyte in the exhaust chamber does not exceed the level of the electrolyte in the cell chamber, the exhaust chamber widthwise fluid passage W2 at the diagonal position of the flow hole h enters the exhaust chamber. The electrolyte does not reach the opening, and the electrolyte does not flow out from each exhaust chamber into the second longitudinal fluid passage L2. If the battery case is returned to a normal state after being defeated, all the electrolyte solution in each exhaust chamber returns to the corresponding cell chamber through the flow holes, so that the level of the electrolyte solution in the series of cell chambers does not become uneven.

  Next, consider a case where the battery case 1 falls with its end in the longitudinal direction down and the flow hole in the exhaust chamber is positioned above the fluid passage in the width direction of the exhaust chamber. Also in this case, the electrolytic solution in each cell chamber flows out to the corresponding electrolytic solution containing space in the exhaust chamber through the flow hole, but when the liquid level of the electrolytic solution in the cell chamber reaches the level at the lower end of the flow hole h, The outflow of the electrolyte from the room to the exhaust room stops.

  In the present invention, the fluid passage forming wall portion 26 is integrated with the fluid passage forming wall portion 26 in the vicinity of the opening (opening into the exhaust chamber) at one end of the exhaust passage widthwise fluid passage W2. A partition wall 27 projecting toward one longitudinal facing surface Sc of the exhaust chamber and having a tip terminated at a position in front of the one longitudinal facing surface is provided, and the partition wall 27 in each exhaust chamber and each exhaust chamber An electrolyte solution storage space A is formed between the one width direction facing surface Sa, and the end position of the tip of the partition wall 27 is set so that at least a part of the flow hole h is positioned in the electrolyte solution storage space. Therefore, even if there is an electrolyte flowing into the exhaust chamber width direction fluid passage beyond the tip of the partition wall 27, the amount is obtained by subtracting the volume of the electrolyte storage space from the amount flowing out of the cell chamber. Amount. Therefore, even if the electrolyte flowing from the cell chamber through the flow hole h into the electrolyte storage space flows into the exhaust chamber width direction fluid passage W2, the amount is small. In the present invention, the first and second longitudinal fluid passages L1, L2 and the inter-exhaust chamber width direction fluid passages W1a, W1b are interposed between the exhaust chambers and the concentrated exhaust chamber, Since the length of the fluid passage from the exhaust chamber to the central exhaust chamber is very long, even if a small amount of electrolyte flows into the widthwise fluid passage W2 in each exhaust chamber, the electrolyte is concentrated. The exhaust chamber hardly reaches the exhaust chamber, and the electrolyte hardly leaks from the central exhaust chamber through the exhaust port.

  In particular, as in the above-described embodiment, the battery case 1 overturns with its end in the longitudinal direction facing down, so that the flow holes h in each exhaust chamber are larger than the fluid passage W2 in the exhaust chamber width direction. The volume of the electrolytic solution housing space A is set so that all the electrolytic solution flowing out from the cell chamber into the exhaust chambers through the flow holes can be stored in the electrolytic solution housing space A when it is in the upper position. In such a case, the battery case 1 falls down with one end in the longitudinal direction down, and the flow holes h in the exhaust chambers are positioned above the fluid passages in the exhaust chamber width direction. In this case, since all of the electrolyte flowing out from the cell chamber to the exhaust chambers through the flow holes h is accommodated in the electrolyte accommodating space A, the electrolyte flowing into the electrolyte accommodating space causes the tip of the partition wall portion 27 to flow. Overflowing into the exhaust chamber width direction fluid passage W2. . Therefore, even when the battery case 1 falls over with its end in the longitudinal direction down, and the flow holes in each exhaust chamber are positioned above the fluid passage W2 in the exhaust chamber width direction, It is possible to prevent the electrolyte from flowing out from each exhaust chamber into the second longitudinal fluid passage L2 through the exhaust chamber widthwise fluid passage W2. In this case, all the electrolyte flowing out from each cell chamber to the exhaust chamber stays in each exhaust chamber. Therefore, when the battery case is brought down and returned to a normal state, it flows out from each cell chamber into the exhaust chamber. It is possible to return all of the electrolytic solution returned to the original cell chamber through the flow holes, and to prevent the amount of the electrolytic solution in the series of cell chambers provided in the battery case from becoming uneven.

  As described above, according to the present invention, when the battery case falls, in most cases, the electrolyte flowing out from each cell chamber can be retained in each exhaust chamber, and the electrolyte flowing out from each exhaust chamber Even if there is, since the amount can be a small amount, unless the battery case is shaken intentionally while the battery case is tilted or the battery case is turned down, the battery case is moved from the battery case to the outside. The electrolyte does not leak out. Therefore, it is possible to reduce the possibility that the electrolyte solution flows out to the outside when the battery case falls down, and to reduce the possibility that the periphery of the battery is soiled with the electrolyte solution. In addition, when the battery case falls down, a large amount of electrolyte does not flow out from each exhaust chamber. When the fallen battery case is returned to a normal state, the electrolyte solution that flows out from each cell chamber when it falls down Since almost all of this can be returned to the original cell chamber, the amount of electrolyte in the series of cell chambers provided in the battery case can be prevented from becoming uneven.

  Further, as in the above embodiment, if the flow hole h provided in the bottom wall portion of each exhaust chamber is also used as the electrolyte injection hole, it is not necessary to provide many holes in the bottom wall portion of the exhaust chamber, Unlike the conventional lead storage battery in which the exhaust hole, the electrolyte recirculation hole, and the electrolyte injection hole are provided, it is not necessary to provide many partition walls and cylindrical portions in each exhaust chamber. The structure of the part 5 can be simplified.

  If the structure of the inner lid part 4 and the upper lid part 5 can be simplified, the structure of the mold used when molding the inner lid part 4 and the upper lid part 5 can be simplified to reduce the cost. Therefore, the manufacturing cost can be reduced. If the structure of the inner lid portion 4 and the upper lid portion 5 can be simplified, the pattern of the joint portion between the inner lid portion and the upper lid portion can be simplified. Thus, it is possible to prevent the yield of the product from being deteriorated due to failure in joining the middle lid portion and the upper lid portion.

  If the barrier portion 28 is provided as in the above-described embodiment, the battery case 1 falls over with the end in the width direction facing down, and the flow hole h is the other longitudinally facing surface Sd of each exhaust chamber. The electrolyte solution storage space for storing the electrolyte solution that has flowed out of the cell chamber through the flow hole h when it is positioned above the space between the barrier portion 28 and one longitudinal facing surface Sc of each exhaust chamber. Formed. Thereby, when the battery case 1 falls down, it can suppress that the electrolyte solution which flowed out from the cell chamber into the exhaust chamber moves to the fluid passage side in the exhaust chamber width direction, so that the battery case is returned to a normal posture. In this case, the electrolyte in the exhaust chamber can be easily returned to each cell chamber.

  If the barrier portion 28 is provided as in the above embodiment, the battery case 1 falls with its end in the longitudinal direction down, and the flow hole is positioned below the fluid passage in the exhaust chamber width direction. In this case, an electrolytic solution storage space for storing the electrolytic solution flowing out from the cell chamber through the flow hole h into the exhaust chamber can be formed between the barrier portion 28 and one width direction facing surface Sa of each exhaust chamber. Therefore, when the battery case falls down and the flow hole is positioned below the fluid passage W2 in the exhaust chamber width direction, the electrolyte flowing out from the cell chamber into the exhaust chamber moves to the fluid passage W2 side in the exhaust chamber width direction. When the battery case is returned to a normal posture, the electrolyte solution in the exhaust chamber can be easily returned to each cell chamber.

  In the above-described embodiment, the first protruding wall portion 29 and the second protruding wall portion 30 provided on the partition wall portion 27 and the barrier portion 28, respectively, the battery case 1 falls with the end portion in the width direction facing down. Thus, the electrolyte that has flowed out of the cell chamber through the flow hole h when the flow hole h is positioned above the other longitudinally facing surface Sd of each exhaust chamber is the exhaust chamber width direction fluid passage W2 side. It acts to suppress the movement to.

  In addition, the partition wall 27, the barrier 28, and the protruding walls 29 and 30 are exhausted from the cell chambers through the flow holes in the same manner as the partition walls and the barriers provided in the exhaust chamber in this type of conventional lead storage battery. It acts to liquefy the electrolyte mist contained in the gas flowing into the room.

  In the above-described embodiment, the three exhaust chambers D1 to D3 arranged near one end in the longitudinal direction of the inner lid portion 4 are arranged so that each one longitudinal facing surface Sc is on one end side in the longitudinal direction of the inner lid portion. The other three exhaust chambers D4 to D6 which are provided in a positioned state and are arranged near the other end in the longitudinal direction of the inner lid part 4 have their respective longitudinally facing surfaces Sc in the longitudinal direction of the inner lid part 4. It is provided in a state positioned on the other end side in the direction. If comprised in this way, since three exhaust chambers are arrange | positioned symmetrically with respect to the center part of the longitudinal direction of the inner cover part 4, it was arrange | positioned at the both ends of the longitudinal direction of the inner cover part 4, respectively. The configuration of the gas flow path connecting between the central exhaust chamber and each exhaust chamber can be symmetrical with respect to the central portion in the longitudinal direction of the inner lid portion 4. It is possible to balance the pressures in the gas flow paths connecting the two and exhaust the gases from the respective exhaust chambers evenly.

  In the above embodiment, the liquid injection port 40 is provided in the upper lid portion 5, but the upper lid portion 5 may be sealed without providing the liquid injection port 40.

  In the above embodiment, among the pair of longitudinally opposed surfaces Sc and Sd of each exhaust chamber, Sc is one longitudinally opposed surface and Sd is the other longitudinally opposed surface. It is good also as a longitudinal direction opposing surface and the other longitudinal direction opposing surface. That is, in FIG. 2, the right and left positions of the flow hole h in each exhaust chamber and the fluid passage W2 in the exhaust chamber width direction may be interchanged. In FIG. 2, the positions of the first longitudinal fluid passage L1 and the second width fluid passage L2 are interchanged, and accordingly, the flow hole h is provided near the one end 4a in the width direction of the inner lid portion 4. You may do it.

  In the above embodiment, the flow hole h is constituted by a single hole, but the flow hole h may be composed of an assembly of a plurality of small holes h1, for example, as shown in FIG. When the flow hole h is constituted by an assembly of a plurality of small holes h1, the shape of the small holes h1 and the number of small holes h1 are arbitrary. In order to minimize the amount of electrolyte that flows out through the flow hole h when the battery tank falls, the flow hole h has an opening area (in the case of an assembly of a plurality of small holes, a plurality of small hole openings). The total area) is preferably set as small as possible within a range that does not hinder the injection of the electrolyte. Further, when the flow hole h is constituted by an assembly of a plurality of small holes h1, the plurality of small holes h1 constituting the flow hole h are provided on one longitudinal direction facing surface of each exhaust chamber and the second longitudinal direction fluid passage side. Preferably, the exhaust chambers are provided in a concentrated manner (so as not to be dispersed) in the vicinity of one corner portion C1 formed between one of the exhaust chambers positioned in the width direction opposite surface.

DESCRIPTION OF SYMBOLS 1 Battery case 2 Battery case main body 3 Cover part 4 Middle cover part 5 Upper cover part 20 Perimeter wall part 22 Wall part for forming an exhaust chamber etc. 26 Wall part for fluid passage formation 27 Partition part 28 Barrier part 29 1st protrusion wall Part 30 Second projecting wall portion L1 First longitudinal fluid passage L2 Second longitudinal fluid passage W1a First exhaust chamber width fluid passage W1b Second exhaust chamber width fluid passage W2 Exhaust chamber width Directional fluid passage h Flow hole Sa One widthwise facing surface of the exhaust chamber Sb The other widthwise facing surface of the exhaust chamber Sc One lengthwise facing surface of the exhaust chamber Sd The other lengthwise facing surface of the exhaust chamber C1 to C4 Exhaust 1st thru | or 4th corner part formed in room | chamber A A Electrolyte accommodation space

Claims (15)

A direction along the long side and a direction along the short side of the battery case body having a battery case body formed entirely in a rectangular parallelepiped shape and a lid portion for closing the opening at the upper end of the battery case body A plurality of cell chambers arranged along the longitudinal direction of the battery case, formed in the battery case body, and one end in the longitudinal direction of the battery case and the other. An inner lid portion extending between the ends and having a direction along the longitudinal direction and a direction along the width direction of the battery case as a longitudinal direction and a width direction, respectively, is provided in a part of the lid portion, and the inner lid portion A plurality of independent exhaust chambers respectively corresponding to the plurality of cell chambers are formed between the middle lid portion and the upper lid portion, and each of the exhaust chambers and the corresponding cell chamber A through hole is provided through the bottom wall of each exhaust chamber that divides the space, and at least in the longitudinal direction of the battery case. A concentrated exhaust chamber is provided at a position near one end between the middle lid portion and the upper lid portion, the plurality of exhaust chambers are communicated with the concentrated exhaust chamber, and the concentrated exhaust chamber passes through an exhaust port. In lead-acid batteries that are open to the outside,
Each exhaust chamber has a pair of width direction opposing surfaces opposed to the width direction of the inner lid portion and a pair of longitudinal opposite surfaces opposed to the longitudinal direction of the inner lid portion. Four corners are formed,
A first longitudinal fluid passage extending on the outer side of the plurality of exhaust chambers along the longitudinal direction of the middle lid portion on one end side in the width direction of the middle lid portion, and having an end portion connected to the concentrated exhaust chamber A second longitudinal fluid passage extending outside the plurality of exhaust chambers along the longitudinal direction of the battery case at the other end side in the width direction of the inner lid portion, and selected from the plurality of exhaust chambers Between at least one exhaust chamber extending between the specified adjacent exhaust chambers in the width direction of the inner lid portion and connecting between the first longitudinal fluid passage and the second longitudinal fluid passage A widthwise fluid passage is formed between the upper lid portion and the middle lid portion,
The flow hole also serves as an electrolyte injection hole, and has one longitudinal facing surface of each exhaust chamber and one width facing surface of each exhaust chamber positioned on the second longitudinal fluid passage side. It is located near one corner formed between them,
In each exhaust chamber, one end opens to the other corner portion that extends in the width direction of the inner lid portion along the other longitudinal facing surface of each exhaust chamber and is at a diagonal position of the one corner portion, A fluid passage forming wall portion that forms an exhaust chamber widthwise fluid passage having the other end opened in the second longitudinal fluid passage between the other longitudinally facing surface of each exhaust chamber, and the exhaust chamber The fluid passage forming wall is integrated with the fluid passage forming wall near the opening at the one end of the width direction fluid passage, and protrudes from the fluid passage forming wall to the one longitudinal direction facing surface of each exhaust chamber. A partition wall portion having a distal end that terminates at a position in front of the longitudinally opposed surface of each of the exhaust chambers is provided in a state of being integrated with the inner lid portion and the upper lid portion, and is opposed to the partition wall portion of each exhaust chamber and the one width direction. An electrolytic solution storage space is formed between the surface and
The end position of the tip of the partition wall is set so that at least a part of the flow hole is positioned in the electrolyte solution storage space;
Lead acid battery characterized by. A cell when the battery case overturns with one of its longitudinal ends down and the flow holes in each exhaust chamber are positioned above the fluid passage in the width direction of the exhaust chamber. The volume of the electrolyte solution storage space is set so that all the electrolyte solution flowing out from the chamber into the exhaust chambers through the flow holes can be stored in the electrolyte solution space;
The lead acid battery according to claim 1. Each exhaust chamber protrudes from the one longitudinal facing surface of each exhaust chamber at a position closer to the partition wall side than the flow hole, and the inside of the electrolyte solution storage space faces the fluid passage forming wall side. An extending barrier portion is further provided integrally with the inner lid portion and the upper lid portion,
The barrier portion is provided in an inclined state toward the corner portion formed between the other longitudinal direction facing surface and the one width direction facing surface of each exhaust chamber, and the tip thereof is for forming the fluid passage The lead acid battery according to claim 1 or 2, which is terminated at a position before the wall portion.   A first projecting wall portion that protrudes from the position in front of the front end of the partition wall portion toward the barrier portion and terminates at a position in front of the barrier portion, and the position of each exhaust chamber from the position in front of the front end of the barrier portion. A second projecting wall portion protruding toward one width direction facing surface and terminating at a position before the one width direction facing surface is further provided integrally with the middle lid portion and the upper lid portion. The lead acid battery according to claim 3. The upper surface of the bottom wall portion of each exhaust chamber is inclined so as to gradually decrease from the vicinity of the opening at one end of the fluid passage in the width direction of the exhaust chamber toward the flow hole,
The bottom surface of the first longitudinal fluid passage is inclined so as to gradually become lower toward a portion where the inter-exhaust chamber width direction fluid passage and the first longitudinal fluid passage meet,
The bottom surface of the fluid passage in the width direction between the exhaust chambers is inclined so as to gradually become lower from the first longitudinal fluid passage side toward the second longitudinal fluid passage side,
On the bottom surface of the second longitudinal fluid passage, gradually toward the portion where the opening at the other end of the fluid passage in the exhaust chamber width direction provided in each exhaust chamber and the second longitudinal fluid passage meet. Be inclined to lower,
The lead acid battery according to claim 1, 2, 3, or 4. The central exhaust chamber is provided at a position near one end and a position near the other end in the longitudinal direction of the inner lid part,
One end and the other end of the first longitudinal fluid passage communicate with concentrated exhaust chambers respectively provided at a position near one end and a position near the other end of the inner lid portion;
The lead acid battery according to claim 1, 2, 3, 4 or 5. The cell chamber and the exhaust chamber are provided in 2n (n is an integer of 2 or more), and the second longitudinal fluid passage is divided into the first portion and the second portion at a position that bisects the inner lid portion in the longitudinal direction. Divided into two parts by a partition,
Two exhaust passage widthwise fluid passages are provided, and one of the exhaust passage widthwise fluid passages is between the first longitudinal fluid passage and the first portion of the second longitudinal fluid passage. The other exhaust chamber widthwise fluid passage is provided to connect between the first longitudinal fluid passage and the second portion of the second longitudinal fluid passage. The lead acid battery as described in any one of 1 thru | or 6. The n exhaust chambers arranged near one end in the longitudinal direction of the inner lid portion are provided in a state where the one longitudinal facing surface is located on one end side in the longitudinal direction of the inner lid portion,
The other n exhaust chambers arranged near the other end in the longitudinal direction of the inner lid portion are provided in a state where the one longitudinal facing surface is located on the other end side in the longitudinal direction of the inner lid portion. The lead acid battery of Claim 7 currently used. A battery case body that is formed in a substantially rectangular parallelepiped shape as a whole and a lid portion that closes the opening at the upper end of the battery case body, along the long side and the short side of the cross section of the battery case main body A battery case having a longitudinal direction and a width direction respectively is provided, and first to sixth cell chambers arranged in order from one end side to the other end side in the longitudinal direction of the battery case are formed in the battery case, An inner lid portion extending between one end and the other end in the longitudinal direction of the battery case and having a direction along the longitudinal direction and a direction along the width direction of the battery case as the longitudinal direction and the width direction, respectively, is one of the lid portions. An upper lid portion is joined to the middle lid portion, and independent first to sixth exhaust chambers respectively corresponding to the first to sixth cell chambers are connected to the middle lid portion and the upper lid portion. A through hole formed through the bottom wall of each exhaust chamber that partitions each exhaust chamber and the corresponding cell chamber Provided between the middle lid portion and the upper lid portion, the first and second concentrated exhaust chambers are provided at positions near one end and the other end in the longitudinal direction of the battery case, respectively. In a lead acid battery in which first to sixth exhaust chambers are communicated with the first and second concentrated exhaust chambers, and the first and second concentrated exhaust chambers are opened to the outside through an exhaust port,
Each exhaust chamber has a pair of width direction facing surfaces opposed to the width direction of the inner lid portion and a pair of longitudinal direction facing surfaces opposed to the longitudinal direction of the inner lid portion. Two corners are formed,
An outer side of the first to sixth exhaust chambers is provided on one end side in the width direction of the inner lid portion so as to extend along the longitudinal direction of the inner lid portion, and one end and the other end are the first and first ends, respectively. A first longitudinal fluid passage connected to the two concentrated exhaust chambers, and an outer side of the first to sixth exhaust chambers on the other end side in the width direction of the middle lid in the longitudinal direction of the middle lid A second longitudinal fluid passage provided to extend along the first exhaust passage and between the second exhaust chamber and the third exhaust chamber, the first longitudinal fluid passage and the second longitudinal fluid passage. A first inter-exhaust chamber widthwise fluid passage connecting the first exhaust passage and the first longitudinal fluid passage and the second longitudinal fluid passage through the fourth exhaust chamber and the fifth exhaust chamber. A second fluid passage in the width direction between the exhaust chambers connected between the upper lid portion and the middle lid portion,
The flow hole also serves as an electrolyte injection hole, and has one longitudinal facing surface of each exhaust chamber and one width facing surface of each exhaust chamber positioned on the second longitudinal fluid passage side. Only one corner is provided near each corner formed between the exhaust chambers,
In each exhaust chamber, one end opens to the other corner portion that extends in the width direction of the inner lid portion along the other longitudinal facing surface of each exhaust chamber and is at a diagonal position of the one corner portion, A fluid passage forming wall portion that forms an exhaust chamber widthwise fluid passage having the other end opened in the second longitudinal fluid passage between the other longitudinally facing surface of each exhaust chamber, and the exhaust chamber The fluid passage forming wall is integrated with the fluid passage forming wall near the opening at the one end of the width direction fluid passage, and protrudes from the fluid passage forming wall to the one longitudinal direction facing surface of each exhaust chamber. A partition wall portion having a distal end that terminates at a position in front of the longitudinally opposed surface of each of the exhaust chambers is provided in a state of being integrated with the inner lid portion and the upper lid portion, and is opposed to the partition wall portion of each exhaust chamber and the one width direction. An electrolytic solution storage space is formed between the surface and
The end position of the tip of the partition wall is set so that at least a part of the flow hole is positioned in the electrolyte solution storage space;
Lead acid battery characterized by. A cell when the battery case overturns with one of its longitudinal ends down and the flow holes in each exhaust chamber are positioned above the fluid passage in the width direction of the exhaust chamber. The volume of the electrolyte solution storage space is set so that all the electrolyte solution flowing out from the chamber into the exhaust chambers through the flow holes can be stored in the electrolyte solution space;
The lead acid battery according to claim 9. Each exhaust chamber is integrated with the one longitudinal facing surface of each exhaust chamber at a position closer to the partition wall side than the flow hole, and protrudes from the one longitudinal facing surface to accommodate the electrolyte solution. A barrier portion extending in the space toward the fluid passage forming wall portion side is further provided integrally with the middle lid portion and the upper lid portion,
The barrier portion is provided in an inclined state toward the corner portion formed between the other longitudinal direction facing surface and the one width direction facing surface of each exhaust chamber, and the tip thereof is for forming the fluid passage The lead acid battery according to claim 9 or 10, which is terminated at a position before the wall portion. The second longitudinal fluid passage is divided into a first portion and a second portion by a partition wall provided at a boundary portion between the third exhaust chamber and the fourth exhaust chamber,
The fluid passages in the width direction between the first and second exhaust chambers are provided between the second exhaust chamber and the third exhaust chamber, and between the fourth exhaust chamber and the fifth exhaust chamber, respectively. The lead acid battery according to claim 9, 10 or 11. The first to third exhaust chambers are provided in a state where one longitudinal direction opposing surface is positioned on one end side in the longitudinal direction of the inner lid portion,
The fourth to sixth exhaust chambers are provided in a state in which one of the opposing surfaces in the longitudinal direction is positioned on the other end side in the longitudinal direction of the inner lid portion,
The lead acid battery according to claim 8, 9, 10, 11 or 12.   The lead-acid battery according to any one of claims 1 to 13, wherein the flow hole is a single hole.   The lead-acid battery according to any one of claims 1 to 13, wherein the flow hole is composed of an assembly of a plurality of holes.

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