JP2015002166A - Lead storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily flow gas emitted from an individual exhaust port to a collective exhaust port, and reduce acid mists contained in gas, while simplifying a structure of an exhaust flow passage and restraining an electrolyte from flowing to outside of a battery.SOLUTION: A lead storage battery 100 comprises a battery case 2 blocked into plural cell chambers, and a battery case cover 3 for closing an upper opening of the battery case 2. Plural individual exhaust ports 3b linearly aligned corresponding to each cell chamber, and linear exhaust flow passages 3c communicated with the plural individual exhaust ports 3b are formed on the battery case cover 3. A collective exhaust port 3c3 that is an outlet of the exhaust flow passage 3c is provided outside an outermost individual exhaust port 3bx in an aligning direction of the plural individual exhaust ports 3b. In the exhaust flow passage 3c, plural partition walls 9 are provided for parting the adjacent individual exhaust ports 3b, and the outermost individual exhaust port 3bx and the collective exhaust port 3c3, and forming a gas passage space 3S at an upper part in the exhaust flow passage 3c.

Description

  The present invention relates to a lead-acid battery.

  As a conventional lead-acid battery, as shown in Patent Document 1, a battery case partitioned into a plurality of cell chambers, a battery case lid that closes the upper opening of the battery case, and each cell chamber in the battery case cover There is an open type lead-acid battery that has an individual exhaust port for exhausting the gas emitted from the cell chamber to the outside and an exhaust passage that collectively guides the gas from the plurality of individual exhaust ports to the outside.

  In this open type lead-acid battery, the inside and outside of the battery case are spatially continuous through the exhaust port and the exhaust passage, so that when the lead-acid battery is tilted or vibrated, the electrolyte from the exhaust port flows into the exhaust stream. Easy to flow out through the road.

  Here, as shown in Patent Document 2, a partition is formed on the upper surface of the battery case lid in the battery case lid and the upper cover constituting the exhaust flow path so that the electrolyte does not flow outside through the exhaust flow path. It has been considered that the flow path from the individual exhaust port to the collective exhaust port is lengthened by forming a partition wall on the lower surface of the metal plate and thermally welding the partition walls to each other. Specifically, a complicated maze structure is formed by, for example, forming a flow path from the individual exhaust port to the collective exhaust port in a zigzag manner.

  However, if the exhaust passage is made into a complicated labyrinth structure and the passage until exhaust is made longer, it is difficult to exhaust the gas emitted from the individual exhaust outlets without any delay from the collective exhaust outlet. In addition, by making the exhaust flow path longer, the ratio of the area forming the exhaust flow path on the upper surface of the battery case lid increases, and other components (for example, the liquid injection port or the liquid injection port are provided). The arrangement of the liquid spout etc. is restricted.

JP 2001-266845 A JP 2008-186690 A

  Accordingly, the present invention has been made to solve the above-mentioned problems, and while simplifying the configuration of the exhaust flow path, suppressing the electrolyte from flowing out of the battery, the gas discharged from the individual exhaust ports is collected all at once. While making it easy to flow to an exhaust port, reducing the acid mist contained in gas makes it the main subject.

  That is, the lead storage battery according to the present invention is a lead storage battery including a battery case partitioned into a plurality of cell chambers, and a battery case lid that closes an upper opening of the battery case. A plurality of individual exhaust ports arranged linearly corresponding to the cell chambers and a linear exhaust flow path communicating with the plurality of individual exhaust ports are formed, and collectively the outlets of the exhaust flow paths Exhaust ports are provided outside the outermost individual exhaust ports along the arrangement direction of the plurality of individual exhaust ports, and between the individual exhaust ports adjacent to each other in the exhaust flow path and the outermost side And a plurality of partition walls that form a gas passage space in the upper part of the exhaust passage.

In such a case, a plurality of individual exhaust ports arranged in a straight line are connected by a straight exhaust channel, and the configuration of the exhaust channel can be simplified.
In this configuration, a plurality of partition walls are provided between the individual exhaust ports adjacent to each other and between the outermost individual exhaust port and the collective exhaust port and form a gas passage space in the upper portion of the exhaust passage. Therefore, the gas exiting from each individual exhaust port flows through the upper part of the linear flow path and then flows to the collective exhaust port, so that the gas is easily exhausted. On the other hand, since the lower part in the exhaust channel is partitioned by a plurality of partition walls, it is possible to suppress the electrolyte solution that has exited from the individual exhaust ports from flowing out of the battery from the collective exhaust port through the exhaust channel.
In addition, since the plurality of partition walls partition between the individual exhaust ports adjacent to each other, the electrolyte solution discharged from each individual exhaust port moves to the other individual exhaust ports, and the electrolyte solution in each cell chamber is biased. Can be prevented.
Furthermore, since a plurality of partition walls are provided in the exhaust flow path, the acid mist (acid mist) contained in the gas discharged from each individual exhaust port returns to the liquid droplets by contacting the plurality of partition walls. By the baffle plate effect, the acid mist can be removed and the amount reaching the collective exhaust port can be reduced.

In the exhaust flow path, it is preferable that a porous member is provided on the collective exhaust port side with respect to a partition partitioning the outermost individual exhaust port and the collective exhaust port.
If this is the case, the speed at which the electrolyte flows out to the outside can be slowed down by the porous member, and the electrolyte from each individual exhaust port can be further suppressed from flowing from the collective exhaust port to the outside of the battery through the exhaust passage. Can do. In addition, since a partition is provided between the plurality of individual exhaust ports and the porous member, the amount of the electrolytic solution reaching the porous member can be reduced, and the electrolytic solution is contained in the porous member. It is possible to prevent clogging due to invasion.

It is desirable that the porous member be configured so that the gas passage direction is downward.
In this case, even if the porous member is impregnated with the electrolyte, the impregnated electrolyte moves in the downward direction and is the same as the gas passage direction. Therefore, the impregnated electrolyte only moves downward due to gravity. In addition, since the gas is pushed downward and moves downward, the electrolytic solution does not stay at the inlet portion of the porous member, and the exhaust function is not completely stopped. Therefore, according to the present invention, there is an excellent effect that the liquid when the battery falls is less likely to flow to the outside, and the exhaust function can be used even after returning from the fall. In particular, a battery mounted on a two-wheeled vehicle has a specific problem that a tipping occurs temporarily during use, and the lead storage battery of the present invention can be suitably used for a two-wheeled vehicle.

Preferably, one partition wall is provided between the individual exhaust ports adjacent to each other, and one partition wall is provided between the outermost individual exhaust port and the collective exhaust port.
In this case, while making the internal structure of the exhaust passage extremely simple, it is possible to easily flow the gas exiting from the individual exhaust port to the collective exhaust port while suppressing the electrolyte from flowing out of the battery, and is included in the gas. Acid mist can be reduced.

The battery case lid includes a lid body that closes the battery case, and an upper lid provided on an upper portion of the lid body, and a linear groove is formed on an upper surface of the lid body, and the plurality of individual exhausts An opening is formed in the bottom surface of the groove, the plurality of partition walls are provided in the groove, and the exhaust channel is formed by closing the groove with the upper lid, and the partition wall Preferably, the gas passage space is formed between the upper surface of the upper cover and the lower surface of the upper lid.
If it is this, while being able to simplify the structure of a lead acid battery, the manufacture can be simplified. Moreover, before the groove | channel provided in the upper surface of the lid | cover main body is obstruct | occluded with an upper cover, a porous member can be attached in the said groove | channel.

It is desirable that the partition walls have a flat plate shape that is arranged orthogonal to the extending direction of the grooves.
If it is this, the structure of a partition can be simplified very much and the manufacture can be simplified.

  The lead acid battery is preferably a liquid open type. In such a lead storage battery, the effect of the present invention becomes more remarkable.

  According to the present invention configured as described above, while simplifying the configuration of the exhaust passage, it is possible to easily flow the gas exiting from the individual exhaust ports to the collective exhaust port while suppressing the electrolyte from flowing out of the battery. The acid mist contained in the gas can be reduced.

The perspective view which shows schematically the structure of the lead acid battery of this embodiment. The top view which shows roughly the structure of the lead acid battery of the embodiment. Sectional drawing which shows the structure of the lead acid battery of the embodiment roughly. The partial expanded sectional view which mainly shows the exhaust flow path of the embodiment, the porous member, and the partition. The partial expanded sectional view seen from the flow-path direction which mainly shows the partition of the embodiment. The partial expanded sectional view which shows schematically the structure of the lead acid battery of deformation | transformation embodiment.

  Hereinafter, an embodiment of a lead storage battery according to the present invention will be described with reference to the drawings.

  The lead storage battery 100 according to the present embodiment is used by being mounted on an automobile such as a two-wheeled vehicle, for example, and is a 6-cell monoblock liquid open-type lead storage battery. In addition, although 6-cell monoblock type is demonstrated in this embodiment, it is applicable also to 3 cell monoblock type etc., and the number of cells is not specifically limited.

  Specifically, as shown in FIGS. 1 to 3, the battery case 2 has a substantially rectangular parallelepiped shape divided into six cell chambers by five partition walls arranged in parallel to each other, and the battery case 2. And a battery case lid 3 having a substantially rectangular plate shape for closing the upper opening. Each cell chamber of the battery case 2 contains an electrode plate group 4 and an electrolyte solution (both not shown) made of dilute sulfuric acid. The electrode plate group 4 is electrically connected to the positive electrode terminal 5 and the negative electrode terminal 6 via a positive electrode strap and a negative electrode strap (both not shown), and a plurality of positive electrode plates and negative electrode plates are separated by separators. Are stacked. The positive electrode plate is obtained by holding a positive electrode active material made of lead dioxide on a positive electrode lattice made of Pb—Sb alloy, and the negative electrode plate is made by holding a negative electrode active material made of lead on a negative electrode lattice made of Pb—Sb alloy. It is a thing. Here, the content of antimony in the Pb—Sb alloy is 1.5 mass% or more and 3 mass%, preferably 2 mass% or more.

  The battery case lid 3 includes six liquid inlets 3a provided corresponding to the respective cell chambers, six liquid stoppers 7 for closing the six liquid inlets 3a, and the liquid inlet lids corresponding to the respective cell chambers. Six individual exhaust ports 3b provided at positions different from the liquid ports 3a (liquid port plugs 7), and an exhaust flow path 3c that leads to the outside of the six individual exhaust ports 3b that are connected to all the six individual exhaust ports 3b. And. In the open type lead storage battery 100, hydrogen gas and oxygen gas are generated in the battery case 2 during use, and the hydrogen gas and oxygen gas are discharged to the outside through the individual exhaust port 3b and the exhaust passage 3c. The open-type lead-acid battery 100 is a so-called non-maintenance-free type lead-acid battery that requires regular replenishment because the electrolyte (battery liquid) decreases due to electrolysis and evaporation of water. is there.

  As shown in FIGS. 1 to 3, the exhaust passage 3 c is connected to the six individual exhaust ports 3 b and extends in the horizontal direction along the plane direction of the battery case lid 3. A straight downward channel 3c2 extending vertically downward from one end (right end in FIG. 3) of the channel 3c1.

  One end (right end) of the main channel 3c1 is configured to extend outward from the battery case 2, and the downward channel 3c2 extends downward from the right end. That is, the downward flow path 3c2 is configured to be located outside the battery case 2. The lower end opening 3c3 of the downward flow path 3c2 serves as an exhaust port (hereinafter also referred to as a collective exhaust port 3c3) for collectively discharging the gas that has passed through the exhaust flow path 3c downward. (See FIG. 3). With this configuration, the collective exhaust port 3c3 that is the outlet of the exhaust passage 3c is provided outside the outermost individual exhaust port 3bx along the arrangement direction of the plurality of individual exhaust ports 3b.

  As shown in FIGS. 1 to 3, the battery case lid 3 of the present embodiment includes a lid main body 31 having a substantially rectangular plate shape that closes the upper opening of the battery case 2, and a flat plate shape provided on the upper surface of the lid main body 31. And an upper lid 32.

  The lid body 31 is formed with the six liquid injection ports 3a and the six liquid port plugs 7 and six individual exhaust ports 3b provided at positions different from the liquid injection port 3a (liquid port plug 7). Has been. Six liquid injection ports 3a (liquid port plugs 7) are arranged linearly in the left-right direction, and six individual exhaust ports 3b are also arranged linearly in the left-right direction. The arrangement direction of the plugs 7) and the six individual exhaust ports 3b are configured to be parallel to each other.

  The lid body 31 is formed with a groove 31M extending in the left-right direction, and the six individual exhaust ports 3b are formed on the bottom surface of the groove 31M.

  Further, as shown in FIG. 4, a downward flow path forming portion 311 for forming the downward flow path 3c2 is provided to extend on one side surface in the left-right direction of the lid main body 31 (right side surface in FIG. 3). A right end portion of the groove 31M is formed on the upper surface of the downward flow path forming portion 311, and a linear through hole 311x is formed so as to open at the bottom surface of the right end portion of the groove 31M. The linear through hole 311x forms the downward flow path 3c2, and the lower opening of the through hole 311x becomes the collective exhaust port 3c3. Note that the downward flow path forming portion 311 of the present embodiment is substantially L-shaped when viewed from the front, and a groove 31M is formed on the upper surface of the L-shaped horizontal portion 311a, and the L-shaped vertical portion 311b has a groove. A through hole 311x is formed. The through hole 311x is a hole having a tapered shape in which the sectional opening gradually decreases in the downward direction. In addition, not only a taper shape but cross-sectional opening may be a straight shape with the same diameter.

  Then, by attaching the upper lid 32 to the upper surface of the lid body 31 configured as described above by heat welding or the like so as to cover the entire groove 31M, one exhaust passage 3c communicating with the six individual exhaust ports 3b is formed. It is formed. The downward flow path forming portion 311, specifically, the L-shaped vertical portion 311 b is a connection port to which an external pipe such as a soft tube (for example, polyvinyl chloride or polyethylene) is attached, and the external pipe is externally fitted. As a result, the external piping is connected. This external piping is for discharging the gas exiting from the collective exhaust port 3c3 to the outside from a safe position away from the lead storage battery 100.

  Thus, in the lead storage battery 100 of the present embodiment, as shown particularly in FIG. 4, the acid mist contained in the discharged gas is removed from the individual exhaust port 3 b together with the function of preventing the ignition and external ignition. A porous member 8 having an electrolyte solution outflow delay function for preventing the electrolyte solution from flowing out to the outside through the exhaust passage 3c is provided. The porous member 8 is formed of a plastic sintered porous body made of plastic such as polypropylene having water repellency, for example, porous ceramics such as alumina or porous glass.

  The porous member 8 is provided so as to block the downward flow path 3c2 (through hole 311x) in the exhaust flow path 3c, and is disposed so that the gas passage direction in the porous member 8 is downward. Yes. That is, the porous member 8 and the collective exhaust port 3c3 that is the outlet of the downward flow path 3c2 are arranged in a vertical relationship in this order along the vertical direction.

  Specifically, the porous member 8 is fitted and attached to a filter fitting wall 311z formed on the upper surface of the L-shaped horizontal portion 311a. More specifically, the porous member 8 is fitted and attached between the filter fitting wall 311z and the inner surface of the groove 31M.

  The filter fitting wall 311z has a shape opposed to the planar view shape of the porous member 8. For example, when the planar view shape of the porous member 8 is circular, the plane of the filter fitting wall 311z is flat. The visual shape is a partial circular shape. Further, the height of the filter fitting wall 311z is approximately the same as the thickness of the porous member 8, and in a state where the porous member 8 is attached to the filter fitting wall 311z, the upper surface of the filter fitting wall 311z is porous. It is comprised so that the upper surface of the member 8 may become substantially flush. The shape of the porous member 8 is not particularly limited as long as it has a size that covers the upper end opening of the through-hole 311x such as a rectangular shape or a polygonal shape in plan view. Further, if a gap is formed between the porous member 8 and the lower surface 321 of the upper lid 32, the thickness of the porous member 8 can be designed as appropriate, and the upper surface of the filter fitting wall 311z and the porous member 8 can be designed. The upper surface may be not substantially flush with the upper surface.

  As a method for attaching the porous member 8, the porous member 8 is fitted into the filter fitting wall 311z formed on the bottom surface of the groove 31M in the downward flow path forming portion 311 before the upper lid 32 is bonded to the lid body 31. After putting the porous member 8 in the downward flow path forming portion 311, the upper lid 32 is adhered to the lid body 31. Thus, the battery case lid 3 is formed, the main flow path 3c1 communicating with the plurality of individual exhaust ports 3b, the downward flow path 3c2 extending downward from the main flow path 3c1, and the downward direction are formed. The porous member 8 is provided in the flow path 3c2. As described above, the porous member 8 can be provided in the downward flow path 3c2 simply by fitting the porous member 8 into the filter fitting wall 311z of the downward flow path forming portion 311 from the upper part. Can be simplified to simplify the production of the lead-acid battery 100.

  Furthermore, in the lead storage battery 100 of the present embodiment, as shown in FIGS. 1 to 3, in the exhaust flow path 3 c, between the individual exhaust ports 3 b adjacent to each other and with the outermost individual exhaust port 3 bx. A plurality of partition walls 9 are provided to partition the exhaust port 3c3.

  As shown in FIGS. 4 and 5, the plurality of partition walls 9 are provided in the lower part in the exhaust passage 3b, and form a gas passage space 3S in the upper part in the exhaust passage 3c. That is, the partition wall 9 partitions a portion other than the gas passage space 3S in the exhaust passage 3c without a gap.

  Specifically, the plurality of partition walls 9 are provided at equal intervals in the groove 31 </ b> M of the lid main body 31. Each partition wall 9 has a flat plate shape that is arranged orthogonal to the extending direction (left-right direction) of the groove 31M. The partition wall 9 (9a) provided between the individual exhaust ports 3b adjacent to each other is provided at a position equidistant from the individual exhaust ports 3b adjacent to each other. Further, the partition wall 9 (9b) provided between the outermost individual exhaust port 3bx and the collective exhaust port 3c3 is provided at a substantially equidistant position from the outermost individual exhaust port 3bx and the collective exhaust port 3c3. Yes.

  The upper cover 32 is adhered to the upper surface of the lid body 31 by heat welding or the like so as to cover the entire groove 31M, so that the gas passage space 3S is formed between the upper surface 91 of the partition wall 9 and the lower surface 321 of the upper lid 32. It is formed. In the present embodiment, the upper surface 91 of the partition wall 9 is a flat surface, and the lower surface 321 of the upper lid 32 has a recess 321M that is recessed inward. At this time, the lower limit of the distance between the upper surface 91 of the partition wall 9 and the lower surface 321 of the upper lid 32 (the bottom surface of the recess 321M) is 1.0 mm. In the present embodiment, a recess 321M is formed on the lower surface 31 of the upper lid 32 in order to secure the gas passage space 3S while increasing the height dimension of the partition wall 9 as much as possible to increase the effect of blocking the electrolyte. However, the lower surface 31 of the upper lid 32 may be a flat surface.

  According to the lead storage battery 100 of the present embodiment configured as described above, the plurality of linear exhaust ports 3b arranged in a straight line are connected by the straight exhaust channel 3c, and the configuration of the exhaust channel 3c is simplified. Can be.

  In this configuration, a plurality of gas exhaust spaces 3S are formed between the individual exhaust ports 3b adjacent to each other and between the outermost individual exhaust ports 3bx and the collective exhaust ports 3c3 and in the upper part of the exhaust flow path 3c. Since the partition walls 9 are provided, the gas exiting from each individual exhaust port 3b flows through the upper part of the linear exhaust passage 3c and flows to the collective exhaust port 3c3, so that the gas is easily exhausted. On the other hand, since the lower part in the exhaust passage 3c is partitioned by a plurality of partition walls 9, it is possible to prevent the electrolyte solution from each individual exhaust port 3b from flowing out of the battery from the collective exhaust port 3c3 through the exhaust passage 3c. can do.

  In addition, since the plurality of partition walls 9 (9a) partition between the individual exhaust ports 3b adjacent to each other, the electrolytic solution discharged from each individual exhaust port 3b moves to the other individual exhaust ports 3b, and each cell chamber It is possible to prevent bias in the electrolyte solution.

  Further, since the plurality of partition walls 9 are provided in the exhaust flow path 3c, the acid mist (acid mist) contained in the gas discharged from each individual exhaust port 3b comes into contact with the plurality of partition walls 9 to form droplets. Returning, due to the baffle effect of the partition wall 9, the acid mist can be removed, and the amount reaching the collective exhaust port 3c3 can be reduced.

  Further, since the porous member 8 is provided in the exhaust passage 3c, the speed at which the electrolyte flows out to the outside by the porous member 8 can be slowed, and the electrolyte that has flowed out of the battery case 2 into the exhaust passage 3c. Can be prevented from flowing out of the battery through the exhaust passage 3c. Here, since the partition wall 9 is provided between the plurality of individual exhaust ports 3b and the porous member 8, the amount of the electrolytic solution reaching the porous member 8 can be reduced, and the electrolytic solution can be reduced. It is possible to prevent the porous member 8 from being impregnated and clogged.

  Furthermore, since the gas passage direction in the porous member 8 is configured to be downward, even if the porous member 8 is impregnated with the electrolytic solution, the movement direction of the impregnated electrolytic solution is downward, It is the same as the passing direction, and the impregnated electrolytic solution not only moves downward due to gravity, but also moves downward due to being pushed by the gas, so that the electrolytic solution does not stay at the inlet portion of the porous member 8, The exhaust function does not stop completely. Therefore, according to the present embodiment, the liquid when the battery 100 is overturned hardly flows out to the outside, and an excellent effect is obtained that the exhaust function can be used even after returning from the overturn.

The present invention is not limited to the above embodiment.
For example, in the above-described embodiment, one partition wall 9 is provided between the individual exhaust ports 3b adjacent to each other and between the outermost individual exhaust port 3bx and the collective exhaust port 3c3. It is good also as a structure which provided the 2 or more partition 9 between them. If this is the case, it is possible to further suppress the electrolytic solution from the individual exhaust port 3b from flowing out of the battery from the collective exhaust port 3c3 through the exhaust passage 3c.

  In addition, the partition walls 9 of the above embodiment have the same shape, but may have different shapes. For example, it may be configured such that the height of the partition wall 9 closer to the collective exhaust port 3c3 increases.

  Furthermore, in the embodiment, the partition wall 9 is provided only in the groove 31M and the partition wall 9 is not provided in the upper lid 32. However, the partition wall 10 may be provided in the upper lid 32. For example, as shown in FIG. 6, the partition wall 10 is placed on the left side (opposite to the collective exhaust port 3c3) and / or right side (collective exhaust port 3c3 side) of the partition wall 9 in the groove 31M so as to face the partition wall 9. It may be provided. This partition wall 10 is provided in the upper part in the exhaust flow path 3b, and forms a gas passage space in the lower part in the exhaust flow path 3c. By providing the partition wall 10 in addition to the partition wall 9 in this way, it is possible to further suppress the electrolytic solution that has exited from the individual exhaust ports 3b from flowing out of the battery from the collective exhaust port 3c3 through the exhaust passage 3c. Further, the acid mist (acid mist) contained in the gas discharged from each individual exhaust port 3 b returns to the liquid droplets by coming into contact with the plurality of partition walls 9 and the partition walls 10, due to the baffle plate effect of the partition walls 9 and the partition walls 10. By removing the acid mist, the amount reaching the collective exhaust port 3c3 can be further reduced.

  In addition, the porous member 8 of the above embodiment is provided by being fitted to the filter fitting wall 311z formed in the groove 31M. However, the downward flow path is not provided without providing the filter fitting wall 311z. It is good also as a structure inserted in 3c2 (through-hole 311x). In this case, the filter fitting wall 311z is preferably provided because it functions as a partition wall even if the porous member 8 is not fitted.

  In addition, although the downward flow path of the embodiment is directed vertically downward, the downward flow path may be directed obliquely downward. The shape of the downward flow path may be a curved shape or a bent shape in addition to a linear shape.

  In addition, the downward flow path forming portion of the embodiment has a substantially L-shape, but any other shape that can form a downward flow path is acceptable, and the right end of the groove 31M is formed on the upper surface. Alternatively, the protrusion may have a through hole 311x formed therein.

  In addition, it goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Lead storage battery 2 ... Battery case 3 ... Battery case cover 3b ... Individual exhaust port 3c ... Exhaust flow path 3c3 ... Collective exhaust port 31 ... Cover body 31M ... Groove 32 ... upper lid 8 ... porous member 9 ... partition

Claims (7)

A lead-acid battery comprising a battery case partitioned into a plurality of cell chambers and a battery case lid that closes an upper opening of the battery case,
The battery case lid is formed with a plurality of individual exhaust ports arranged linearly corresponding to each cell chamber, and a linear exhaust flow path communicating with the plurality of individual exhaust ports,
A collective exhaust port that is an outlet of the exhaust flow path is provided outside the outermost individual exhaust port along the arrangement direction of the plurality of individual exhaust ports,
A plurality of the exhaust passages which are adjacent to each other and between the outermost individual exhaust port and the collective exhaust port and which form a gas passage space in the upper part of the exhaust passage. Lead-acid battery provided with a partition wall.   The lead-acid battery according to claim 1, wherein a porous member is provided on the exhaust outlet side of the exhaust passage relative to a partition wall that partitions the outermost individual exhaust outlet and the collective exhaust outlet.   The lead acid battery according to claim 2, wherein the porous member is configured such that a gas passage direction is downward. One of the partition walls is provided between the individual exhaust ports adjacent to each other,
The lead acid battery according to any one of claims 1 to 3, wherein one partition wall is provided between the outermost individual exhaust port and the collective exhaust port. The battery case lid has a lid body that closes the battery case, and an upper lid that is provided on an upper part of the lid body.
A linear groove is formed on the upper surface of the lid body,
The plurality of individual exhaust ports are formed on the bottom surface of the groove,
The plurality of partition walls are provided in the groove;
5. The gas exhaust space is formed between the upper surface of the partition wall and the lower surface of the upper lid by closing the groove with the upper lid, and the gas passage space is formed between the upper surface of the partition wall and the lower surface of the upper lid. The lead acid battery according to one item.   The lead acid battery according to claim 5, wherein the partition wall has a flat plate shape arranged orthogonal to the extending direction of the groove.   The lead acid battery according to any one of claims 1 to 6, wherein the lead acid battery is an open type.