JP2015022997A - Lead acid power storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make gas exhausted from an individual exhaust port to easily flow into a collective exhaust port in order to reduce acid mist contained in gas while simplifying a configuration of an exhaust passage and also while inhibiting an electrolytic solution from flowing out to the outside of a battery.SOLUTION: On a battery jar lid 3, a plurality of individual exhaust ports 3b provided corresponding to each cell chamber and exhaust passages 3c communicating with the plurality of individual exhaust ports 3b are formed. A lead acid power storage battery has a cover body 9 which is provided having a gap permitting the vertical motion with respect to the exhaust passage 3c and covers each individual exhaust port 3b by self-weight.

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 An open type lead-acid battery having a plurality of individual exhaust ports for exhausting gas exiting from the cell chamber provided to the outside and an exhaust passage for collectively guiding gases from the plurality of individual exhaust ports to the outside is there.

  However, since this open type lead-acid battery is spatially continuous between the inside and outside of the battery case through the exhaust port and the exhaust passage, when the lead-acid battery is inclined or vibrated, the electrolyte solution discharged from the exhaust port Easily flows out through the exhaust passage. Further, when the gas generated in each cell chamber is discharged to the outside through the exhaust passage, the acid mist (acid mist) is also discharged to the outside together with the gas.

  Here, as shown in Patent Document 2, in the battery case lid and the upper cover constituting the exhaust passage, a partition wall on the labyrinth is formed on the upper surface of the battery case cover and the lower surface of the upper cover, and both the partition walls are thermally welded to each other. Thus, it is considered that the exhaust flow path is made into a labyrinth structure and its length is increased.

  However, if the exhaust passage is made into a complicated labyrinth structure and the passage until exhaust is lengthened, it is difficult to exhaust the gas emitted from the individual exhaust port without delay. 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 problems, and while simplifying the configuration of the exhaust flow path, it suppresses the electrolyte from flowing out of the battery, while allowing the gas exiting from the individual exhaust port to flow outside. The main problem is to reduce the acid mist contained in the gas.

  That is, a lead storage battery according to the present invention is a lead storage battery including a battery case in which a plurality of cell chambers are formed and containing a flowable electrolyte solution, and a battery case lid that closes an upper opening of the battery case. The battery case lid has an exhaust passage formed therein, and a plurality of individual exhaust ports that respectively connect the exhaust passage and the plurality of cell chambers. On the other hand, it is provided with a gap allowing vertical movement, and has a cover body that closes each individual exhaust port by its own weight.

In such a case, the cover body is provided with a clearance allowing vertical movement with respect to the exhaust flow path, and the cover body is configured to block each individual exhaust port by its own weight. When the internal pressure of each cell chamber rises, the cover body rises to open the individual exhaust port, and the gas in the cell chamber can be discharged from the individual exhaust port to the exhaust passage.
Further, when the gas is not exhausted through the individual exhaust port, the individual exhaust port is closed by the cover body, and it is possible to prevent the electrolyte from flowing out from each cell chamber to the exhaust passage. In addition, even if the electrolyte solution flows into the exhaust flow path, the cover body provided in the exhaust flow path functions as a baffle plate, so that the electrolyte solution discharged from each individual exhaust port moves to the other individual exhaust ports. Thus, it is possible to prevent the electrolyte in each cell chamber from being biased.
Furthermore, since the individual exhaust port is closed by the cover body at the normal time and the gas is not always discharged, the gas is discharged when necessary. The amount of fog) can be reduced.
In this way, the simple structure of providing the cover body in the exhaust passage makes it easy to flow the gas exiting from the individual exhaust port to the outside while suppressing the electrolyte from flowing out of the battery, and the acid mist contained in the gas. Can be reduced.

It is desirable that the cover body has a cover main body that covers the individual exhaust port and an insertion portion that protrudes from the lower surface of the cover main body and is inserted into the individual exhaust port.
In this case, since the insertion part of the cover body is inserted into the individual exhaust port, the cover body is prevented from being displaced in the plane direction with respect to the individual exhaust port, and the individual exhaust port is not opened unexpectedly. it can.

It is desirable that a gap is provided between the insertion portion and the individual exhaust port to allow the insertion portion to move up and down relative to the individual exhaust port.
If this is the case, the cover body has an insertion portion, and the individual exhaust port is blocked in a state where the insertion portion is inserted into the individual exhaust port. it can.

The battery case lid has a lid body that closes the battery case, and an upper lid that is provided on an upper portion of the lid body, and the exhaust passage closes a groove provided on an upper surface of the lid body with the upper lid. Preferably, the distance between the uppermost surface of the cover body and the lower surface of the upper lid that covers the individual exhaust port by its own weight is smaller than the protruding height of the insertion portion.
In this case, for example, when the cover body moves upward with respect to the individual exhaust port due to vibration or the like, the insertion portion is prevented from being pulled out of the individual exhaust port, and the individual exhaust port is not blocked. can do.

It is desirable that a removal preventing portion that protrudes from a part of the upper surface of the cover main body or the lower surface of the upper lid and restricts the range of vertical movement is provided so that the insertion portion does not pull out from the individual exhaust port.
If this is the case, for example, the volume of the space above the cover body in the exhaust flow path can be increased compared to the case where the overall thickness of the cover body is increased, and the gas exiting from the individual exhaust port can be more easily flown to the outside. Can do. Further, when the cover main body is provided with the removal preventing portion, the configuration of the battery case lid is not changed, and the manufacturing cost can be suppressed. In the case where the removal prevention part is provided on the upper lid, the structure of the cover main body can be simplified, and the weight of the cover main body can be reduced. As a result, the cover body can easily move due to an increase in the internal pressure of the cell chamber, and the gas in the cell chamber can easily exit the exhaust passage. Further, before the groove provided on the upper surface of the lid body is closed with the upper lid, the cover body can be attached in the groove.

The cover body preferably closes at least two of the plurality of individual exhaust ports.
If it is this, the number of parts of a cover body can be reduced and manufacture of a lead storage battery can be simplified.

It is desirable that the cover body is provided separately for each of the plurality of individual exhaust ports.
In this case, only the cover body that closes the individual exhaust port corresponding to the cell chamber in which the pressure has increased can be moved, and it can move independently regardless of the operation of the cover body that covers the other individual exhaust ports. The cover body can easily move up and down.

It is desirable that a porous member is provided between an individual exhaust port on the most downstream side in the exhaust channel and an outlet of the exhaust channel.
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 the cover body is provided between the plurality of individual exhaust ports and the porous member, the amount of the electrolytic solution that reaches the porous member can be reduced, and the electrolytic solution becomes a porous member. Impregnation and clogging can be prevented.

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.

  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 port to the outside while suppressing the electrolyte from flowing out of the battery. The acid mist contained in 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 same embodiment, a porous member, a cover body, and a removal prevention part. The partial expanded sectional view which shows schematically the structure of the lead acid battery of deformation | transformation 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. Further, the open type lead-acid battery 100 is a so-called non-maintenance-free type lead-acid battery that requires regular water replenishment because the electrolytic solution (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. Thus, the structure of the exhaust flow path 3c is simplified by connecting the plurality of individual exhaust ports 3b arranged linearly by the linear exhaust flow path 3c.

  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 (most downstream) individual exhaust port 3bx along the arrangement direction of the plurality of individual exhaust ports 3b. Become.

  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. In addition, the separate exhaust port 3b of this embodiment has a substantially circular opening shape.

  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, as shown in FIG. 4, 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, the lead storage battery 100 of this embodiment has the cover body 9 which is provided in the exhaust flow path 3c and block | closes the several separate exhaust port 3b with dead weight, as shown in FIGS.

  The cover body 9 is provided with at least a gap allowing vertical movement with respect to the main flow path 3c1 in the exhaust flow path 3c. Specifically, the cover body 9 is an integral member that covers all of the plurality of individual exhaust ports 3b, and is provided so as to protrude from the cover body 91 that covers the plurality of individual exhaust ports 3b and the lower surface 91a of the cover body 91. And a plurality of insertion portions 92 to be inserted into the plurality of individual exhaust ports 3b.

  The cover main body 91 has a shape corresponding to the shape of the main flow path 3c1 in plan view, that is, a shape corresponding to the shape of the groove 31M of the lid main body 31 in plan view (see FIG. 2). It is a flat plate having a substantially rectangular shape in plan view. The cover body 91 is not limited to a substantially rectangular shape in plan view as long as the cover body 91 covers all of the plurality of exhaust ports 3b, and may have a portion having a large width and a portion having a small width in plan view.

  The cover body 91 is provided with a gap that allows at least vertical movement with respect to the main flow path 3c1. Specifically, the width dimension of the cover body 91 is smaller than the width dimension of the main flow path 3c1 within a range in which the entire individual exhaust port 3b can be covered, and the longitudinal dimension of the cover body 91 is a plurality of individual exhaust ports 3b. Is smaller than the longitudinal dimension of the main flow path 3c1, and the thickness of the cover body 91 is larger than the height dimension of the main flow path 3c1 (the distance between the lower surface and the upper surface of the main flow path 3c1). Is also small. More specifically, the width dimension of the cover body 91 is smaller than the width dimension of the groove 31M of the lid body 31, and the longitudinal dimension of the cover body 91 is smaller than the longitudinal dimension of the groove 31M of the lid body 31. Is smaller than the distance between the bottom surface of the groove 31M of the lid body 31 and the lower surface 321 of the upper lid 32.

  The insertion portion 92 is provided on the lower surface 91a of the cover main body 91 so as to extend substantially vertically downward from the lower surface 91a. Each insertion portion 92 has a shape corresponding to the individual exhaust port 3b. In the present embodiment, the insertion portion 92 has a substantially cylindrical shape. The insertion portion 92 has a shape that forms a gap that allows at least vertical movement with respect to the individual exhaust port 3b. Specifically, the outer diameter of the insertion portion 92 is smaller than the inner diameter of the individual exhaust port 3b.

  Thus, since the cover main body 91 forms a gap between the main flow path 3c1 and the insertion portion 92 forms a gap between the individual exhaust ports 3b, the cover body 91 is located with respect to the main flow path 3c1. It will be provided with play (play) and will be movable at least in the vertical direction.

  Further, since the cover body 9 is provided with a backlash with respect to the main flow path 3c1, the individual exhaust port 3b is blocked by its own weight in a normal time when gas is not exhausted from the cell chamber through the individual exhaust port 3b. . That is, the lower surface 91a of the cover main body 91 is in contact with the lower surface of the main channel 3c1 (the bottom surface of the groove 31M) with the insertion portion 92 inserted into the individual exhaust port 3b. On the other hand, when the internal pressure of the cell chamber increases, the cover body 9 is pushed up by the gas in the cell chamber and lifts, and the lower surface 91a of the cover body 91 is separated from the lower surface of the main flow path 3c1 (the bottom surface of the groove 31M). Thus, the individual exhaust port 3b is opened. As a result, gas exits from the cell chamber to the main flow path 3c1 and is exhausted to the outside through the collective exhaust port 3c3.

  And in this embodiment, the removal prevention part 10 which controls the range of the up-and-down movement of the cover body 9 is provided in the upper surface 91b of the cover main body 91 so that the insertion part 92 may not be extracted from the separate exhaust port 3b. . The removal preventing part 10 is a plurality of protrusions provided on the upper surface 91b of the cover main body 91 so as to extend substantially vertically upward from the upper surface 91b. The plurality of protrusions 10 of the present embodiment are provided at an intermediate position between the adjacent insertion portions 92 on the upper surface 91 b of the cover main body 91. In addition, the plurality of protrusions 10 are separated from the inner surface of the main channel 3c1 (specifically, the lower surface 321 of the upper lid 32) in the normal state. When exhausting the gas from the cell chamber through the individual exhaust port 3b, any one of the plurality of protrusions 10 is connected to the inner surface of the main channel 3c1 (with the cover body 9 floating from the individual exhaust port 3b). Specifically, it contacts the lower surface 321) of the upper lid 32. Thereby, the movement range of the vertical movement of the cover body 9 is limited. The distance between the upper surface of the protrusion 10 of the cover body 9 that closes the individual exhaust port 3 b and the lower surface of the upper lid 32 is smaller than the protruding height of the insertion portion 92. In this case, for example, when the cover body 9 is moved upward with respect to the individual exhaust port 3b due to vibration or the like, the insertion portion 92 is removed from the individual exhaust port 3b and does not block the individual exhaust port 3b. Can be prevented. Further, for example, the volume (gas venting volume) of the space above the cover body 91 in the main flow path 3c1 can be increased compared with the case where the entire thickness of the cover body 91 is increased, and the gas discharged from the individual exhaust port 3b. Can be made easier to flow to the outside.

<Effect of this embodiment>
According to the lead storage battery 100 of the present embodiment configured as described above, the cover body 9 is provided with a gap allowing vertical movement with respect to the main flow path 3c1 of the exhaust flow path 3c. Is configured to block each individual exhaust port 3b by its own weight, so that only when the internal pressure of each cell chamber rises, the cover body 9 opens the individual exhaust port 3b and exhausts the gas inside the cell chamber individually. It can take out to the main flow path 3c1 from the opening 3b. The gas exiting the main flow path 3c1 flows through the gap between the main flow path 3c1 and the cover body 9 and flows to the collective exhaust port 3c2.

  In this way, when the gas is not exhausted through the individual exhaust port 3b, the individual exhaust port 3b is closed by the cover body 9, and the electrolyte solution is prevented from flowing out from each cell chamber to the exhaust channel 3c. be able to. Further, even if the electrolytic solution comes out to the exhaust passage 3c, the cover body 9 provided in the exhaust passage 3c functions as a baffle plate, so that the electrolytic solution from each individual exhaust port 3b becomes another individual exhaust. It can move to the opening | mouth 3b and it can prevent that bias arises in the electrolyte solution in each cell chamber.

  Furthermore, since the individual exhaust port 3b is closed by the cover body 9 at the normal time and the gas is not always discharged, the gas is discharged when necessary. 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 cover body 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. It is possible to prevent the porous member 8 from being impregnated and clogged.

  As described above, the simple structure of providing the cover body 9 in the exhaust flow path 3c facilitates the flow of the gas from the individual exhaust ports 3b to the collective exhaust port 3c3 while suppressing the electrolyte from flowing out of the battery. The acid mist contained in the gas can be reduced.

  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 embodiment, the single cover body 9 blocks all of the plurality of individual exhaust ports 3b, but the cover body 9 blocks at least two or more of the plurality of individual exhaust ports 3b. It may be. In this case, two or more cover bodies 9 are provided in the exhaust flow path 3c.

  Moreover, as shown in FIG. 5, the cover body 9 may be provided separately for each of the plurality of individual exhaust ports 3b. In this case, the removal preventing part 10 provided on the upper surface of the cover body 91 of the cover body 9 may be constituted by a protrusion as in the above embodiment, but as shown in FIG. The cover body 91 itself may be configured to function as the removal prevention unit 10 by increasing the size.

  Furthermore, in the embodiment, the removal preventing part 10 is provided on the upper surface 91b of the cover main body 91, but may be provided on the inner surface of the main flow path 3c1. Specifically, as shown in FIG. 6, a plurality of protrusions 10 may be provided on the lower surface 321 of the upper lid 32 that constitutes the upper surface of the main flow channel 3c1. FIG. 6 (1) shows the removal preventing part 10 in the integrated cover body 9. The removal preventing part 10 is a plurality of protrusions that come into contact with the upper surface 91 b of the cover main body 91. The plurality of protrusions 10 are provided at intermediate positions between the adjacent insertion portions 92. FIG. 6 (2) shows the removal preventing part 10 in the individual cover body 9. The pull-out prevention unit 10 is provided for each cover body 9 and is provided at a position facing the upper surface 91 b so as to contact the upper surface 91 b of the cover body 91.

  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 ... cover body 91 ... cover main body 91a ... lower surface 91b of cover main body ... upper surface 92 of cover main body ... insertion part 10 ...・ Extraction prevention part

Claims (10)

A lead-acid battery comprising a battery case in which a plurality of cell chambers are formed and containing a flowable electrolyte, and a battery case lid that closes an upper opening of the battery case,
The battery case lid has an exhaust passage formed therein, and a plurality of individual exhaust ports that respectively connect the exhaust passage and the plurality of cell chambers.
A lead-acid battery having a cover body that is provided with a gap allowing vertical movement with respect to the exhaust flow path and closes each individual exhaust port by its own weight.   The lead acid battery according to claim 1, wherein the cover body includes a cover main body that covers the individual exhaust port, and an insertion portion that protrudes from a lower surface of the cover main body and is inserted into the individual exhaust port.   The lead acid battery according to claim 2, wherein a gap allowing at least vertical movement of the insertion portion with respect to the individual exhaust port is provided between the insertion portion and the individual 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.
The exhaust flow path is configured by closing a groove provided on the upper surface of the lid body with the upper lid,
The lead-acid battery according to claim 2 or 3, wherein a distance between an uppermost surface of the cover body and the lower surface of the upper lid that blocks the individual exhaust port by its own weight is smaller than a protruding height of the insertion portion.   5. A removal preventing portion that protrudes from a part of the upper surface of the cover main body or the lower surface of the upper lid and is provided with a removal preventing portion that restricts a range of vertical movement so that the insertion portion does not pull out from the individual exhaust port. Lead acid battery.   The lead storage battery according to any one of claims 1 to 5, wherein the cover body closes at least two of the plurality of individual exhaust ports.   The lead storage battery according to any one of claims 1 to 5, wherein the cover body is provided separately for each of the plurality of individual exhaust ports.   The lead acid battery according to any one of claims 1 to 7, wherein a porous member is provided between an individual exhaust port on the most downstream side in the exhaust passage and an outlet of the exhaust passage.   The lead acid battery according to claim 8, wherein a gas passage direction in the porous member is downward.   The lead-acid battery according to any one of claims 1 to 9, wherein the lead-acid battery is an open type.