JP2017059419A - Lead storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lead storage battery that suppresses rise of liquid level caused by occurrence of an internal pressure difference in a space above the liquid level.SOLUTION: In a lead storage battery comprising a battery tank 20 having an opening on the upper surface thereof, electrode plates 30P, 30N and electrolytic solution which are accommodated in the battery tank 20, and a lid member 50 for sealing the battery tank 20, the lid member 50 includes a lid main body 61, lid walls 91, 93 which are provided along the opening of the battery tank 20 on the lower surface side of the lid main body 61 and joined to the battery tank 20, an exhaust portion T for exhausting gas occurring in the battery tank 20, and separation walls 94A, 94B, 97A which are connected to the lid walls 91, 93 on the inner peripheral side of the lid walls 91, 93 and divide a lower space S of the lid main body 61 surrounded by the lid wall 93 into a first space S1 having the exhaust portion T and a second space S2 having no exhaust portion T. The separation walls 94A, 94B, 97A have a communicating portion 98 for communicating the first space S1 and the second space S2.SELECTED DRAWING: Figure 18

Description

  The present invention relates to a technique for suppressing an increase in liquid level due to an internal pressure difference occurring in an upper space of the liquid level.

  The lead storage battery includes, for example, a battery case and a lid member as described in Patent Document 1 below, and the battery case is hermetically sealed by joining a wall provided on the lower surface of the lid member to the battery case. It is said. In addition, the lead storage battery has a structure in which the gas generated in the battery case is exhausted from an exhaust part provided in the lid member in order to suppress an increase in internal pressure.

JP 2003-142041 A

In addition to the bonding wall, other structural members may be provided on the lower surface of the lid member. On the other hand, it is known that the liquid level in the battery case rises due to overcharging or the like, and such a structural member may divide the upper space of the liquid level as the liquid level rises. When the upper space of the liquid surface is divided, the internal pressure is likely to increase in the space on the side where the exhaust portion does not exist, compared to the space on the side where the exhaust portion exists. Therefore, in a space where the internal pressure is low, the liquid level is likely to rise due to the internal pressure difference, so that the electrolytic solution easily leaks to the outside through the exhaust part.
The present invention has been completed based on the above-described circumstances, and suppresses an increase in the liquid level caused by an internal pressure difference in the upper space of the liquid level, and prevents the electrolyte from leaking outside through the exhaust part. The purpose is to suppress.

  A lead acid battery disclosed in the present specification is a lead acid battery including a battery case having an open top surface, an electrode and an electrolyte solution accommodated in the battery case, and a lid member for sealing the battery case. The lid member includes a lid body, a lid wall provided along the opening of the battery case on the lower surface side of the lid body, and a gas generated in the battery case. An exhaust part for exhausting the air, and a lower space of the lid body that is connected to the cover wall and is surrounded by the cover wall, and a first space having the exhaust part and the exhaust A separation wall that is divided into a second space that does not have a portion, and the separation wall has a communication portion that communicates the first space with the second space.

  According to the lead storage battery disclosed in the present specification, it is possible to suppress an increase in liquid level due to an internal pressure difference occurring in the upper space of the liquid level. Moreover, it can suppress that electrolyte solution leaks outside through an exhaust part by the raise of a liquid level.

The perspective view of the lead acid battery which concerns on Embodiment 1. Top view of the battery case Vertical sectional view of lead-acid battery (cross-sectional view taken along line AA in FIG. 1) Vertical cross-sectional view of lead-acid battery (cross-sectional view along line BB in FIG. 1) Top view of the inner lid Bottom view of the inner lid Perspective view of the inner lid as seen from below Bottom view of top lid Fig. 5 is an enlarged view of part of Fig. 5 (showing the gas passage of gas) Fig. 8 Partially enlarged view (showing the gas passage of gas) Cross-sectional view showing the structure of the exhaust stack Sectional view showing structure of individual passage Fig. 5 is an enlarged view of part of Fig. 5 (showing the reflux path of the droplet) Diagram showing how the electrode plate looks through the injection hole An enlarged view of a part of FIG. An enlarged view of a part of FIG. An enlarged view of a part of FIG. Vertical sectional view of lead-acid battery (cross-sectional view taken along the line CC in FIG. 1) Vertical sectional view of the lead storage battery according to Embodiment 2 (the communication slit is different from that in FIG. 17) Vertical sectional view of a lead storage battery according to another embodiment (the communication slit is different from that of FIG. 17)

  A lead acid battery disclosed in the present specification is a lead acid battery including a battery case having an open top surface, an electrode and an electrolyte solution accommodated in the battery case, and a lid member for sealing the battery case. The lid member includes a lid body, a lid wall provided along the opening of the battery case on the lower surface side of the lid body, and a gas generated in the battery case. An exhaust part for exhausting the air, and a lower space of the lid body that is connected to the cover wall and is surrounded by the cover wall, and a first space having the exhaust part and the exhaust A separation wall that is divided into a second space that does not have a portion, and the separation wall has a communication portion that communicates the first space with the second space.

  The lid wall of the lid member joins the battery case to seal the battery case, and is provided along the opening of the battery case. Therefore, when a wall exists on the inner peripheral side of the lid wall, the lower wall of the lid body surrounded by the lid wall is defined as a first space (a space having an exhaust part) by connecting the wall with the lid wall. It isolate | separates into 2nd space (space which does not have an exhaust part). In this configuration, a communication portion is provided for the separation wall that separates the lower space of the lid body.

  Therefore, even if the liquid level in the battery case rises and closes the bottom surface portion of the lower space of the lid body, the first space and the second space separated by the separation wall communicate with each other through the communication portion. Therefore, it is possible to suppress an internal pressure difference between the two spaces. From the above, it is possible to prevent the liquid level on the first space side where the exhaust part is present from easily rising, and thus it is possible to suppress the electrolyte from leaking outside through the exhaust part.

  Moreover, as one Embodiment of the lead acid battery disclosed by this specification, the said separation wall has a communicating hole which functions as the said communication part.

  In order to connect the first space and the second space, it is conceivable to provide a communication slit in the separation wall. However, since the separation wall is provided because of technical necessity, if an excessively large communication portion is provided, it is difficult to achieve the original purpose of providing the separation wall. From such circumstances, in the case of the communication slit, it is difficult to widen the width in a limited space, and the shape becomes narrow. As a result, the liquid surface is easily clogged with the surface tension, and the function as the communication portion is easily lost. If it is a communication hole, it will not be provided as a shape that is long in one direction. For example, even if it is a circle with a radius larger than the slit width, the size of the communication part can be limited, so the original function of the separation wall is Hard to be disturbed. As a result, it is possible to design in a shape that is not easily blocked by the surface tension of the liquid surface. Therefore, compared with the communication slit, it is difficult to lose the function as the communication portion, and the effect of suppressing the occurrence of an internal pressure difference in both spaces is high.

  Moreover, as one embodiment of the lead storage battery disclosed in the present specification, the separation wall has a communication slit that functions as the communication portion.

  Since the separation wall is provided because of technical necessity, if the communication portion is provided with a very large size, it is difficult to achieve the original purpose of providing the separation wall. In view of such circumstances, it is preferable that the communicating portion has a slit shape whose width is limited to a certain numerical value or less, and the width of the communicating slit is more preferably 5 mm or less. By making the communication part into a slit shape, the communication part can be extended to a higher position without making it a large communication part. As a result, an internal pressure difference can be prevented from occurring in the two separated spaces until the liquid level rises to a higher position, and the electrolyte can be prevented from leaking outside through the exhaust part. There is also an advantage that it is easy to manufacture with a simple mold. In addition, about the minimum of the width | variety of a communication slit, 1 mm or more is preferable and 3 mm or more is still more preferable. The reason is that if the width of the communication slit is narrowed, the communication slit is likely to be blocked by the surface tension of the liquid surface (the liquid film is easily stretched), and it becomes difficult to function as the communication portion.

  Further, as one embodiment of the lead storage battery disclosed in the present specification, at least a part of the communication portion is located in the lower space of the lid body, and an upper end is a ceiling surface than a bottom surface of the lower space. Close to. In this configuration, even if the liquid level closes the bottom surface of the lower space of the lid body, at least a part of the communicating part is located on the liquid level. Therefore, the two spaces separated by the separation wall can be communicated, and an internal pressure difference between the two spaces can be suppressed. Moreover, the upper end of the communication portion is closer to the ceiling surface than the bottom surface of the lower space. Therefore, as compared with the case where the upper end of the communication portion is provided at a position close to the bottom surface of the lower space, it is possible to suppress an internal pressure difference between the two separated spaces until the liquid level rises to a higher position. It is possible and effective.

  Further, as one embodiment of the lead storage battery disclosed in the present specification, the battery case has a plurality of partition walls that divide the interior into a plurality of cell chambers, and the exhaust unit is provided for each cell chamber, The lid wall of the lid member is provided for each opening of the cell chamber, the separation wall is connected to the lid wall, and the cell chamber has a lower space of the lid body surrounded by the lid wall. Dividing into the first space and the second space.

  When the battery case is partitioned into a plurality of cell chambers, the interval between the partition walls partitioning the cell chambers is narrow, and a separation wall is easily formed. By applying this technology to a lead-acid battery with a structure in which such a separation wall is easily made, even if the liquid level of the electrolyte rises in the cell chamber and closes the bottom surface of the lower space of the lid body, The first space and the second space separated by the separation wall communicate with each other through the communication portion. Therefore, it is possible to suppress the electrolyte from leaking outside through the exhaust part while suppressing the internal pressure difference between the two separated spaces.

  Further, as one embodiment of the lead storage battery disclosed in the present specification, the lid member extends from a liquid injection hole and an edge of the liquid injection hole toward the battery case, and the liquid injection A pair of opposing walls that share and surround the hole, and a guide member that is connected to the lid wall and positions the lid wall with respect to the battery case, and one of the opposing walls includes the lid wall The separation wall is configured together with the connected guide member.

  In this configuration, since the pair of opposing walls surround the liquid injection hole, it is possible to suppress the splash of the electrolytic solution due to vibration from entering the liquid injection hole. Further, the lid wall of the lid member is positioned in the battery case by the guide member. Accordingly, it is possible to suppress the displacement between the lid wall on the lid member side and the battery case. Moreover, even if the liquid level closes the bottom surface of the lower space of the lid body, the communication portion communicates the two spaces separated by the opposing wall and the guide member, so that the two separated spaces, that is, the first space and the first space It is possible to suppress an internal pressure difference between the two spaces.

  Moreover, as one embodiment of the lead storage battery disclosed by this specification, one said opposing wall which comprises the said separation wall has a communicating hole which functions as the said communication part.

  When a pair of opposing walls are provided around the liquid injection hole, when looking into the cell chamber from the liquid injection hole, the electrode plate below the liquid level depends on whether the liquid level has reached the tip (lower end) of the opposing wall. The appearance of the image changes. Therefore, the height of the liquid level can be confirmed by the way the image of the electrode plate is seen. Note that the appearance of the image on the electrode plate changes because when the liquid level reaches the tip (lower end) of the opposing wall, a part of the liquid level is lifted by the surface tension, so the image on the electrode plate appears distorted. It is. The surface tension increases as the contact area of the opposing wall with the liquid level increases. For this reason, it is preferable that the contact area of the opposing wall with respect to the liquid surface does not decrease as the communication portion is formed on the one opposing wall. In this configuration, since the communication part is formed by a communication hole, there is no need to change the shape of the tip of the opposing wall, so the contact area with the liquid surface should be the same as when no communication hole is provided. I can do it. For this reason, the function of checking the liquid level by the facing wall can be maintained.

  Moreover, as one embodiment of the lead storage battery disclosed by this specification, a pair of said opposing wall is facing the direction along the plate | board surface of the electrode plate which functions as the said electrode. In this configuration, since the distortion of the image of the electrode plate below the liquid level that can be seen when looking into the battery case from the liquid injection hole becomes large, it is easy to check the height of the liquid level.

<Embodiment 1>
Embodiment 1 will be described with reference to FIGS.
1. Structure of the lead storage battery 10 The lead storage battery 10 is for vehicles such as automobiles, specifically for idling stop vehicles, and is installed, for example, in the engine room or luggage space of the vehicle and supplies power to the vehicle. The lead storage battery 10 is a liquid lead storage battery, and includes a battery case 15, an electrode plate group 30, an electrolyte solution W, and terminal portions 40P and 40N as shown in FIGS. In the following description, the horizontal direction of the battery case 15 (the arrangement direction of the terminal portions 40P and 40N) when the battery case 15 is placed horizontally without being inclined with respect to the installation surface is defined as the X direction. The height direction (vertical direction) is the Y direction, and the depth direction is the Z direction.

  The battery case 15 includes a battery case 20 that houses the electrode plate group 30 and the electrolytic solution W, and a lid member 50. The battery case 20 is made of synthetic resin. The battery case 20 includes four outer walls 21 and a bottom wall 22 and has a box shape with an open top surface. As shown in FIG. 2, the battery case 20 has a plurality of (five in this example) partition walls 23. The partition walls 23 are formed at approximately equal intervals in the X direction, and partition the inside of the battery case into a plurality of cell chambers 25. The six cell chambers 25 are provided in the lateral width direction (X direction in FIG. 2) of the battery case 20, and have a long and long shape in the Z direction. Each cell chamber 25 accommodates an electrode plate group 30 together with an electrolytic solution W made of dilute sulfuric acid. The outer wall 21 and the partition wall 23 have the same height at the upper end.

  As shown in FIG. 3, the electrode plate group 30 includes a positive electrode plate 30P, a negative electrode plate 30N, and a separator 30C that partitions the electrode plates 30P and 30N. Each of the electrode plates 30P and 30N is configured by filling a lattice with an active material, and ears 31P and 31N are provided at the upper part. The ears 31 </ b> P and 31 </ b> N are provided to connect the electrode plates 30 </ b> P and 30 </ b> N having the same polarity through the strap 32 in the cell chamber 25. The main component of the active material of the positive electrode plate 30P is lead dioxide, and the main component of the active material of the negative electrode plate 30N is lead. The positive electrode plate 30P and the negative electrode plate 30N are examples of the “electrode” in the present invention.

  The strap 32 is, for example, a plate shape long in the X direction, and one set for a positive electrode and a negative electrode is provided for each cell chamber 25. Then, the positive and negative straps 32 of the adjacent cell chambers 25 are electrically connected to each other via a connection portion 33 formed on the strap 32 to connect the electrode plate groups 30 of the cell chambers 25 in series. It has a structure.

  The lid member 50 includes an inner lid 60 and an upper lid 100. 5 is a plan view of the inner lid 60 viewed from above with the upper lid 100 removed, FIG. 6 is a bottom view of the inner lid 60 viewed from below, and FIG. 7 is a perspective view of the inner lid 60 viewed from below. FIG. The inner lid 60 is made of a synthetic resin and includes a lid main body 61 and a flange portion 67 formed on the outer periphery of the lid main body 61.

  The lid body 61 of the inner lid 60 has a size that can seal the upper surface of the battery case 20. As shown in FIG. 6, the lid main body 61 has a plurality of inner walls 91 and a plurality of partition walls 93 on the lower surface side. The inner wall 91 is located inside the flange portion 67 and protrudes downward from the lower surface of the lid main body 61. The inner wall 91 is provided on the entire circumference along the opening of the battery case 20, and has a long frame shape in the X direction as a whole. Each partition wall 93 protrudes downward from the lower surface of the lid body 61, similarly to the inner wall 91. Each partition wall 93 is connected to two inner walls 91 facing in the Z direction. Each partition wall 93 is provided so as to correspond to each partition wall 23 of the battery case 20, and the inner wall 91 having a frame shape has six frame walls (the openings 25 </ b> A of the cell chamber 25 corresponding to the openings 25 </ b> A) of the cell chamber 25. It is divided into a frame wall with a shape along the entire circumference. The partition wall 93 and the inner wall 91 have the same height at the lower end. The “inner wall 91 and the five partition walls 93” is an example of the “lid wall” in the present invention.

  Each inner wall 91 of the inner lid 60 overlaps with the upper end surface of each outer wall 21 of the battery case 20, and each partition wall 93 of the inner lid 60 overlaps with the upper end surface of each partition wall 23 of the battery case 20. As described above, the battery case 20 and the cell chambers 25 are hermetically sealed by overlapping the inner wall 91 and the partition wall 93 on the inner lid 60 side with the walls 21 and 23 on the battery case 20 side. In addition, the inner wall 91 and the outer wall 21, and the partition wall 93 and the partition wall 23 are joined by heat welding so that airtightness is maintained. The flange portion 67 is formed on the outer peripheral edge of the lid body 61. The flange portion 67 extends downward from the lower surface of the lid body 61 and surrounds the upper portion of the outer wall 21 of the battery case 20.

  Further, the inner lid 60 has guide members 94A and 94B. As shown in FIG. 4, a pair of guide members 94A and 94B are provided on both sides of the partition wall 93 in the X direction. The guide members 94 </ b> A and 94 </ b> B are plate-shaped with plate surfaces extending in the XY direction, and extend downward from the lower surface of the lid body 61 of the inner lid 60 toward the inside of the battery case 20.

  The tip portions of the guide members 94A and 94B protrude downward from the tip (lower end) of the partition wall 93. As shown in FIG. 4, the guide members 94 </ b> A and 94 </ b> B have V-shaped guide grooves 94 </ b> C whose apexes are the tips (lower ends) of the partition walls 93. It functions to align the partition wall 93 of the inner lid 60. Specifically, it performs the function of aligning in the X direction (the left-right direction in FIG. 4), which is the arrangement direction of the cell chambers 25. As shown in FIG. 6, the guide members 94A and 94B are provided at three locations in the Z direction with respect to one partition wall 93, and the partition walls 93 are aligned at three points in the Z direction. Yes. 6 and 7, the pair of guide members 94A and 94B are collectively denoted by reference numeral 94. The guide members 94 </ b> A and 94 </ b> B are also provided on the inner surface side of the inner wall 91 of the inner lid 60, and are configured to align the inner wall 91 of the inner lid 60 with the outer wall 21 of the battery case 20.

  As shown in FIGS. 1 and 5, the lid body 61 of the inner lid 60 has a low surface portion 62, a high surface portion 64, and a platform portion 65, and has a shape with a difference in height. Yes. The low surface portion 62 is provided on the rear side and the front side of the lid member 50. On each low surface portion 62 provided at both corners in the X direction on the front side, terminal portions 40P and 40N on the positive electrode side and the negative electrode side are arranged.

  Since the structures of the positive terminal portion 40P and the negative terminal portion 40N are the same, the structure will be described below taking the negative terminal portion 40N as an example. As shown in FIG. 3, the negative terminal portion 40 </ b> N includes a bushing 41 and a pole column 45. The bushing 41 is made of a metal such as a lead alloy and has a hollow cylindrical shape. As shown in FIG. 3, the bushing 41 passes through a cylindrical mounting portion 63 formed integrally with the inner lid 60, and the upper half protrudes from the upper surface of the lower surface portion 62. The upper half part exposed from the upper surface of the low surface part 62 among the bushing 41 is a terminal connection part, and connection terminals (not shown), such as a harness terminal, are assembled | attached.

  In addition, since the inner lid 60 is integrally formed by pouring resin into a mold in which the bushing 41 is inserted, the mounting portion 63 is integrated with the bushing 41 and covers the lower outer periphery of the bushing 41 without a gap. That is, the bushing 41 has a structure in which the other part except the upper half protruding from the upper surface of the inner lid 60 is embedded in the mounting portion 63 of the inner lid 60.

  The pole column 45 is made of a metal such as a lead alloy and has a cylindrical shape. The pole 45 is located inside the bushing 41. The pole column 45 is longer than the bushing 41, the upper portion of the pole column 45 is located inside the bushing 41, and the lower portion projects downward from the lower surface of the bushing 41. The upper end portion of the pole column 45 is joined to the bushing 41 by welding, and the base end portion 47 of the pole column 45 is joined to the strap 32 of the electrode plate group 30.

  The high surface portion 64 of the inner lid 60 is formed at the front center of the lid body 61. The high surface portion 64 is located between the low surface portions 62 formed at both corners in the X direction. The upper surface of the high surface portion 64 is higher than the upper surfaces of the terminal portions 40P and 40N. By doing so, even if a metal member or the like is placed on the upper part of the battery, it is difficult to contact the terminal portions 40P and 40N at the same time, and conduction can be prevented.

  The platform 65 is formed on the rear side of the lid main body 61. The platform 65 extends in the X direction so as to cross the six cell chambers 25 provided in the battery case 20. The upper surface of the trapezoidal portion 65 is higher than the low surface portion 62 and lower than the high surface portion 64.

  Further, as shown in FIG. 5, the base portion 65 of the inner lid 60 has six liquid injection holes 75 in the X direction. These six liquid injection holes 75 penetrate the base portion 65 in the vertical direction and communicate with the six cell chambers 25, respectively. Therefore, it is possible to inject the electrolyte W from each injection hole 75 into each cell chamber 25 of the battery case 20.

  Moreover, the base-shaped part 65 has the lower partition 71-73 which protruded upwards. The lower partition walls 71 to 73 are provided corresponding to the respective liquid injection holes 75 and have a rectangular frame shape surrounding each liquid injection hole 75. Each lower partition 72 is provided on the same straight line extending in the X direction.

  The upper lid 100 is made of a synthetic resin like the inner lid 60. FIG. 8 is a bottom view of the upper lid 100 as viewed from below. The upper lid 100 includes a lid main body 110 and a flange portion 105. The lid body 110 has a rectangular shape that follows the platform portion 65 of the inner lid 60, and is attached to the platform portion 65 of the middle lid 60 in an overlapping manner. The flange portion 105 is formed on the outer peripheral edge of the lid main body 110. The flange portion 105 extends downward from the outer peripheral edge of the lid main body 110 and surrounds the outer periphery of the base portion 65.

  As shown in FIG. 8, the lid body 110 is provided with an outer hole 115 corresponding to the liquid injection hole 75 of the inner lid 60. The lid main body 110 has upper partition walls 121 to 123. The upper partition walls 121 to 123 protrude downward from the lower surface of the lid main body 110 and are provided for each outer hole 115. The upper partition walls 121 to 123 have a rectangular frame shape like the lower partition walls 71 to 73. Each upper partition 122 is provided on the same straight line extending in the X direction.

  Each upper partition 121-123 corresponds to each lower partition 71-73, and each upper partition 121-123 is arranged so as to overlap the upper side of each lower partition 71-73. The upper partition walls 121 to 123 and the lower partition walls 71 to 73 constitute partition walls that surround the liquid injection holes 75 and the outer holes 115. The upper partition walls 121 to 123 and the lower partition walls 71 to 73 are joined to each other by thermal welding. As shown in FIG. 1, a stopper plug 180 is attached to the upper lid 100 to close each outer hole 115. The stopper plug 180 is screwed to the inner peripheral surface of the outer hole 115 and is detachable. By removing the stopper plug 180, the injection hole 75 can be connected to each cell chamber 25 of the battery case 20. On the other hand, liquid replenishment can be performed.

  Further, the lid member 50 of the lead storage battery 10 includes an exhaust tube T, an individual passage R, a common passage U, and tower portions Q1 and Q2 between the inner lid 60 and the upper lid 100. In the following, description will be made with reference to the drawings. The “exhaust tube T” is an example of the “exhaust section” in the present invention.

(Description of exhaust tube T)
The exhaust tube T is divided into a lower exhaust tube 81 and an upper exhaust tube 131. As shown in FIG. 5, the lower exhaust cylinder 81 corresponds to each cell chamber 25 of the battery case 20 and is provided in the X direction with respect to the inner lid 60. Each of the lower exhaust cylinders 81 is a rectangular cylinder with a hollow inside, and extends in both the up and down directions (Y direction) while penetrating the inner lid 60.

  As shown in FIG. 8, the upper exhaust pipe 131 corresponds to each cell chamber 25 of the battery case 20, and six upper exhaust pipes 131 are provided in the X direction with respect to the upper lid 100. The upper exhaust tube 131 is a rectangular tube type whose upper surface is closed, and protrudes downward from the lower surface of the lid body 110.

  As shown in FIG. 11, each upper exhaust tube 131 and each lower exhaust tube 81 overlap each other to constitute an exhaust tube T. Each exhaust tube T communicates with the cell chamber 25 of the battery case 20, and communicates with each individual passage R through a notch 132 formed in the upper exhaust tube 131. Therefore, the gas generated in each cell chamber 25 of the battery case 20 can flow through the notch 132 to the individual passage R after passing through the inside of the lower exhaust pipe 81. Note that the end surfaces of the lower exhaust cylinders 81 and the upper exhaust cylinders 131 are joined to each other by thermal welding so that the air tightness of the exhaust cylinder T is ensured.

  In addition, as shown in FIG. 11, two protrusions 82 </ b> A and 82 </ b> B are provided on the inner wall of the lower exhaust cylinder 81. The two protrusions 82A and 82B face the X direction while shifting their positions in the vertical direction (Y direction). By providing these projecting portions 82A and 82B on the inner wall of the lower exhaust cylinder 81, the electrolyte W splashed from the cell chamber 25 flows into the individual passage R while securing a path for exhausting the gas generated from the cell chamber 25. It is possible to realize a route that is difficult to enter.

  Further, a slit 83 is provided in a lower part of the wall of the lower exhaust cylinder 81. The slit 83 functions to allow the electrolyte W to escape outside the cylinder so that the electrolyte W does not rise inside the lower exhaust cylinder 81 and flow into the individual passage R when the liquid level rises due to overcharging.

(Description of individual passage R)
The individual passage R is a gas discharge space and is provided for each cell chamber 25 of the battery case 20 between the inner lid 60 and the upper lid 100. As shown in FIGS. 5 and 8, each individual passage R communicates with the common passage U, and fulfills the function of circulating the gas flowing out from the exhaust tube T to the common passage U.

  Hereinafter, the configuration of the individual passage R will be specifically described. As shown in FIG. 9, the platform portion 65 of the inner lid 60 has a plurality of lower passage walls 84 for each cell chamber 25 of the battery case 20. The plurality of lower passage walls 84 protrude upward from the base portion 65. The upper end surfaces of these lower passage walls 84 have the same height.

  On the other hand, the lid main body 110 of the upper lid 100 has a plurality of upper passage walls 134 for each cell chamber 25 of the battery case 20 as shown in FIG. The plurality of upper passage walls 134 protrude downward from the lower surface of the lid body 110. The lower end surfaces of these upper passage walls 134 have the same height.

  Each upper passage wall 134 corresponds to each lower passage wall 84 and overlaps the upper side of the corresponding lower passage wall 84. The lower passage wall 84 and the upper passage wall 134 constitute a passage wall RW as shown in FIG. 12, and the individual passage R is provided between the pair of opposing passage walls RW as side walls. The lower passage wall 84 and the upper passage wall 134 are joined to each other by thermal welding so that the air tightness of the individual passage R is ensured.

  The path of the individual passage R is as shown in FIG. 9 and FIG. 10, with the notch 132 of the upper exhaust pipe 131 as the inlet, while meandering left and right (in FIG. 9 and FIG. 10). Proceed to the upper side) and reach the common passage U.

(Description of common passage U and towers Q1 and Q2)
As shown in FIGS. 9 and 10, the common passage U is formed between the lower partition wall 72 and the lower passage wall 84A, and between the upper partition wall 122 and the upper passage wall 134A. That is, the common passage U is provided between the upper partition wall 122 and the lower partition wall 72, the upper passage wall 134A and the lower passage wall 84A as two side walls. The common passage U extends in the X direction so as to cross each individual passage R. And tower part Q1, Q2 is provided in the both ends of the X direction which hits the end of common passage U.

  The tower portions Q1 and Q2 are provided between the inner lid 60 and the upper lid 100. The lower cylinder portion Q1 provided on the platform portion 65 of the inner lid 60 and the upper cylinder portion Q2 provided on the upper lid 100. (See FIGS. 9 and 10). The lower cylindrical portion Q1 protrudes upward from the base portion 65. The lower cylinder portion Q1 is formed with an opening and communicates with the common passage U.

  The upper cylinder portion Q2 protrudes downward from the lower surface of the upper lid 100. The upper cylinder part Q2 overlaps the lower cylinder part Q1. The lower cylindrical portion Q1 and the upper cylindrical portion Q2 are joined to each other by heat welding so that airtightness is ensured.

  In addition, as shown in FIG. 10, the porous filter 150 is accommodated in the upper cylinder part Q2. The lower surface of the porous filter 150 is located above the tip surface of the upper cylindrical portion Q2. The porous filter 150 suppresses the release of water vapor and acid mist and suppresses the entry of external sparks.

  The upper lid 100 is provided with a cylindrical duct 160. One end of the duct 160 is connected (communication) to the upper cylindrical portion Q2, and the other end passes through the flange portion 105 of the upper lid 100 and opens to the outside. Therefore, the gas sent from the common passage U to the tower portions Q 1 and Q 2 can be exhausted to the outside through the duct 160.

  That is, in the lead storage battery 10, the gas generated in each cell chamber 25 of the battery case 20 first flows from each lower exhaust pipe 81 to each individual passage R. Thereafter, the gas flows into the tower portion Q through the common passage U, and is finally exhausted from the duct 160 to the outside.

  Note that only one of the ducts 160 is opened according to the use environment, and the other is sealed with a plug (not shown). In this example, after passing through the common passage U, the gas passing through the individual passage R is exhausted to the outside through the duct 160 on the right side (right side in FIG. 5 and left side in FIG. 8) when viewed from the front in the Z direction.

  Further, the inner lid 60 has six reflux holes 85 in the X direction corresponding to the cell chambers 25 of the battery case 20. Each reflux hole 85 passes through the base portion 65 of the inner lid 60 and communicates with the cell chamber 25 of the battery case 20. As shown in FIG. 9, the reflux hole 85 is disposed at the inlet portion of the individual passage R, and is located farthest from the individual passage R when viewed from the common passage U.

  And the slope (gradient) is attached to the base part 65 which is the bottom face of the individual passage R so as to become lower as it is closer to the reflux hole 85 (see FIGS. 11 and 18). Therefore, the droplet V in the individual passage R can be returned to each cell chamber 25 through the return hole 85.

  That is, water vapor contained in the gas generated in the cell chamber 25 is condensed in the individual passage R when the gas passes through the individual passage R. The condensed droplet V flows toward the reflux hole 85 as shown by a one-dot chain line arrow in FIG. Therefore, the droplets V such as water vapor contained in the gas can be refluxed to each cell chamber 25.

  In addition, on the lower surface of the lid body 61 of the inner lid 60, a reflux cylinder 87 (see FIG. 15) is provided corresponding to each reflux hole 85. The reflux cylinder 87 surrounds the reflux hole 85, and has a function of suppressing the electrolytic solution splashed from the cell chamber 25 from entering the individual passage R through the reflux hole 85 when vibration is applied, for example, when the vehicle is running. Plays.

2. Opposing walls 97A, 97B and communication hole 98
Further, as shown in FIGS. 6 and 7, the inner lid 60 has a pair of opposing walls 97 </ b> A and 97 </ b> B for each liquid injection hole 75. The pair of opposing walls 97 </ b> A and 97 </ b> B extends downward from the lower surface of the lid body 61 of the inner lid 60 toward the inside of the battery case 20. The pair of opposing walls 97A and 97B face each other in the Z direction, and the split slits 97C are located on both sides in the X direction. The pair of opposing walls 97 </ b> A and 97 </ b> B has an arc shape having the same diameter as the liquid injection hole 75, and surrounds the liquid injection hole 75 in a shared manner. As described above, by surrounding the liquid injection hole 75 with the pair of opposing walls 97A and 97B, it is possible to suppress the splash of the electrolytic solution due to vibration from entering the liquid injection hole 75.

  Further, the opposing walls 97A and 97B have their lower end positions set at the same height as the highest liquid level L1 in terms of management of the electrolyte W, and when looking into the battery case 20 from the liquid injection hole 75, Whether the electrolyte W has reached the maximum liquid level L1 can be visually recognized depending on whether or not the images of the electrode plates 30P and 30N below the liquid level appear distorted.

  That is, when the liquid level does not reach the lower end, as shown in FIG. 14A, the images of the electrode plates 30P and 30N that are seen when looking into the battery case 20 from the liquid injection hole 75 are not distorted, Looks like a plate. On the other hand, when the liquid level reaches the lower end, the liquid level rises due to the surface tension, and the images of the electrode plates 30P and 30N appear to be distorted as shown in FIG. The reason why the pair of opposing walls 97A and 97B are facing in the direction (Z direction) along the plate surfaces of the electrode plates 30P and 30N is the electrode visible when looking into the battery case 20 from the liquid injection hole 75. This is because the distortion of the images of the plates 30P and 30N increases, so that it is easy to determine whether the electrolytic solution W has reached the maximum liquid level L1.

  The opposing wall 97A is connected to the inner wall 91 and the partition wall 93 joined to the battery case 20 via guide members 94A and 94B, respectively. That is, in the cell chamber 25 at both ends, the opposing wall 97A is connected to the inner wall 91 and the partition wall 93 on both sides in the X direction (direction orthogonal to the electrode plates 30P and 30N) via the guide members 94A and 94B. Yes.

  In the central cell chamber 25 excluding both ends, the opposing wall 97A is connected to the partition walls 93 on both sides in the X direction (direction perpendicular to the electrode plates 30P and 30N) via the guide members 94A and 94B. Yes. Specifically, as shown in FIGS. 15 to 17, the guide member 94A is connected to a partition wall 93 on one end side in the X direction (left side in FIGS. 16 and 17), and the guide member 94B is connected to the X direction. Are connected to a partition wall 93 on the other end side (right side in FIGS. 16 and 17).

  As shown in FIGS. 16 to 18, the guide members 94 </ b> A and 94 </ b> B and the facing wall 97 </ b> A form the lower space S of the lid main body 61 surrounded by the partition wall 93 and the inner wall 91 for each cell chamber 25. The first space S1 and the second space S2 are separated. The “lower space S of the lid main body 61” refers to a region surrounded by the partition wall 93 and the inner wall 91 in the lower space of the lid main body 61. Therefore, the lower surface of the lid main body 61 (see FIG. 17). L3) to the lower end of the partition wall 93 (L2 shown in FIG. 17). Also, the inner wall 91 may have the same height as the partition wall 93 and the lower end, and the lower space S may be from the lower surface of the lid body 61 to the lower end of the inner wall 91.

  Since only one exhaust tube T is set in the cell chamber 25, it is included in either the first space S1 or the second space S2. In the example of this embodiment, FIG. As shown in FIG. 18, the exhaust pipe T is present in the first space S1 on one side, and the exhaust pipe T is not present in the second space S2 on the other side.

  And the opposing wall 97A has the communicating hole 98, as shown in FIG. The communication hole 98 is circular, and is provided in the range of the lower space S of the lid body 61, that is, in the range of L3 to L2 shown in FIG.

  By providing the communication hole 98 in the opposing wall 97A, the following effects can be obtained. As shown in FIGS. 17 and 18, when the liquid level of the electrolytic solution W is lower than the highest liquid level L1, there are gaps between the liquid level and the opposing wall 97A and between the liquid level and the guide members 94A and 94B, respectively. is there. Therefore, the gas can freely travel between the two spaces S1 and S2 with the opposing wall 97A as a boundary through these gaps. Therefore, in each cell chamber 25, since the internal pressure is uniform in the two spaces S1 and S2 with the opposing wall 97A as a boundary, even if gas is generated due to overcharging or the like, the liquid level rise is uniform.

  However, when the liquid level rises and reaches the maximum liquid level L1, there is no gap between the liquid level and the opposing wall 97A. Thereafter, when the liquid level further rises from the maximum liquid level L1 and reaches the lower end of the partition wall 93 (the position of L2 shown in FIGS. 17 and 18), there is no gap between the liquid level and the guide members 94A and 94B. . That is, the raised liquid level is in a state of closing the bottom surface portion of the lower space S of the lid body 61.

  If the communication hole 98 is not provided for the opposing wall 97A, the liquid level reaches the lower end of the partition wall 93 (position L2 shown in FIG. 17) and the bottom surface portion of the lower space S of the lid body 61 is reached. Is closed, the first space S1 and the second space S2 with the opposing wall 97A as a boundary are divided, and the gas cannot go back and forth between the two spaces S1 and S2. Since the gas does not escape in the second space S2 where the exhaust tube T does not exist, the internal pressure is likely to increase compared to the first space S1 where the exhaust tube T exists, and there is an internal pressure difference between the two spaces S1 and S2. It is likely to occur.

  However, in this configuration, as shown in FIG. 17, the communication hole 98 is provided in the range of the lower space S of the lid body 61 in the facing wall 97 </ b> A. Therefore, even if the liquid level blocks the bottom surface portion of the lower space S of the lid body 61, the gas can go back and forth between the first space S <b> 1 and the second space S <b> 2 through the communication hole 98. Therefore, it is possible to suppress the occurrence of an internal pressure difference between the two spaces S1 and S2.

  In the present embodiment, the communication hole 98 is provided closer to the ceiling surface than the bottom surface of the lower space S. That is, it is provided at a position closer to the lower surface (L3 shown in FIG. 17) of the lid body 61 corresponding to the ceiling surface of the lower space S than the lower end (L2 shown in FIG. 17) of the partition wall 93 corresponding to the bottom surface of the lower space S. By doing in this way, compared with the case where the communicating hole 98 is provided at a position close to the bottom surface of the lower space S, the internal pressure is applied to the two separated spaces S1 and S2 until the liquid level rises to a higher position. It is possible and effective to suppress the difference.

  As described above, the “guide members 94A and 94B and the facing wall 97A” are connected to the two lid walls (inner wall 91 or partition wall 93) located on both sides in the X direction of the cell chamber 25, and each cell chamber is connected. 25, the lower space S of the lid body 61 is divided into two spaces S1 and S2. Therefore, these “guide members 94A and 94B and the opposing wall 97A” are examples of the “separation wall” of the present invention. The “communication hole 98 formed in the opposing wall 97A” is an example of the “communication portion” in the present invention. Further, FIG. 18 shows a simplified shape of the exhaust tube T in order to facilitate understanding of the technology.

3. As described above, even if the rising liquid level blocks the bottom surface of the lower space S of the lid body 61, the first space S1 and the first space S1 separated by the facing wall 97A are separated from each other through the communication hole 98 formed in the facing wall 97A. Gas can travel back and forth through the two spaces S2. Therefore, it is possible to suppress the occurrence of an internal pressure difference between the first space S1 and the second space S2. Therefore, it is possible to suppress the occurrence of imbalance in the rise of the liquid level in the two spaces S1 and S2. That is, the liquid level on the first space S1 side where the exhaust pipe T is present can be prevented from rising easily, so that the electrolyte can be prevented from leaking outside through the exhaust pipe T.

  In particular, when the battery case 20 is partitioned into a plurality of cell chambers 25, the interval between the partition walls 23 that partition the cell chambers 25 is narrow, and a separation wall that separates the lower space S of the lid body 61 is easily formed. By applying the present technology for communicating spaces on both sides of the separation wall to the lead storage battery 10 having a structure in which such a separation wall is easily formed, an internal pressure difference is generated in the separated space as the liquid level rises. It is possible to suppress the electrolyte from leaking through the exhaust tube T while suppressing the occurrence.

  In order to connect the first space S1 and the second space S2, it is also conceivable to provide a communication slit in a part of the separation walls 94A, 94B, 97A. However, since the separation walls 94A, 94B, and 97A are provided because of technical necessity, if an excessively large communication portion is provided, it is difficult to achieve the original purpose of providing the separation walls 94A, 94B, and 97A. From such circumstances, in the case of the communication slit, it is difficult to widen the width in a limited space, and the shape becomes narrow. As a result, it is easy to block with the surface tension of the liquid surface (the liquid film is easily stretched), and the function as the communication portion is easily lost. In this regard, since the communication hole 98 is not provided in a shape that is long in one direction, for example, even when the circle has a radius larger than the slit width, the size of the communication portion can be limited. The function of the body is difficult to be disturbed. As a result, it is possible to design in a shape that is not easily blocked by the surface tension of the liquid surface. Therefore, compared with the communication slit, it is difficult to lose the function as the communication portion, and the effect of suppressing the occurrence of an internal pressure difference in both the spaces S1 and S2 as the liquid level rises is high.

  The communication hole 98 is provided at a position closer to the ceiling surface than the bottom surface of the lower space S. That is, it is provided at a position closer to L3 than L2 shown in FIG. By doing in this way, compared with the case where the communicating hole 98 is provided at a position close to the bottom surface of the lower space S, the internal pressure is applied to the two separated spaces S1 and S2 until the liquid level rises to a higher position. It is possible and effective to suppress the difference.

  The magnitude of the distortion of the images of the electrode plates 30P and 30N that can be seen when looking into the battery case 20 from the liquid injection hole 75 increases in proportion to the surface tension of the liquid surface. The surface tension of the liquid level increases as the contact area of the opposing wall 97A with the liquid level increases. In the present configuration in which the communication hole 98 is provided in the wall surface of the opposing wall 97A, it is not necessary to change the tip shape of the opposing wall 97A, so that the contact area with the liquid surface is the same as that without the communication hole 98. I can do it. Therefore, it is possible to maintain the liquid level check function by the pair of opposing walls 97A and 97B.

  In addition, in the images of the electrode plates 30P and 30N that can be seen when looking into the battery case 20 from the liquid injection hole 75, it is easier to determine the presence or absence of distortion as the distortion in the X direction orthogonal to the plate surface increases. As shown in FIG. 14, the two opposing walls 97A and 97B face each other in the Z direction along the plate surfaces of the electrode plates 30P and 30N, and are provided with split slits 97C in the X direction perpendicular to the plate surfaces. In this configuration, distortion in the X direction perpendicular to the plate surfaces of the electrode plates 30P and 30N increases, and thus visibility of whether the electrolyte W has reached the maximum liquid level L1 is improved.

<Embodiment 2>
A second embodiment will be described with reference to FIG. In the first embodiment, the example in which the communication hole 98 is provided in the opposing wall 97A is shown in order to communicate the separated first space S1 and second space S2. In the second embodiment, the communication method between the first space S1 and the second space S2 is different from that in the first embodiment, and the two spaces S1 and S2 are communicated using the communication slits 200A and 200B.

  Specifically, as shown in FIG. 19, the communication slits 200A and 200B are located on both sides of the opposing wall 97A, the communication slit 200A is between the guide member 94A, and the communication slit 200B is the guide member 94B. It is provided between. The two communication slits 200 </ b> A and 200 </ b> B have a vertically long shape extending in the vertical direction, and the upper end of the slit reaches the lower surface of the lid body 61 of the inner lid 60. The communication slit 200A is tapered such that the width of the slit is widened downward, and the lower end of the slit is cut out downward.

  Also when these communication slits 200A and 200B are provided, it is possible to suppress the occurrence of an internal pressure difference between the first space S1 and the second space S2, as in the case where the communication holes 98 are provided. Therefore, it is possible to suppress the occurrence of imbalance in the rise of the liquid level in the first space S1 and the second space S2. That is, it is possible to suppress the liquid level on the first space S1 side where the exhaust pipe T is present from easily rising, and thus it is possible to suppress the electrolyte W from leaking outside through the exhaust pipe T.

  Further, since the separation walls 94A, 94B, and 97A are provided because of technical necessity, it is difficult to achieve the original purpose of providing the separation walls 94A, 94B, and 97A if an excessively large communication portion is provided. Become. In view of such circumstances, it is preferable that the communication portion has a slit shape whose width is limited to a certain numerical value or less, and more preferably, the width of the communication slits 200A and 200B is 5 mm or less. By making the communication part into a slit shape, the communication part can be extended to a higher position without making it a large communication part. As a result, an internal pressure difference can be prevented from occurring in the two separated spaces S1 and S2 until the liquid level rises to a higher position, and the electrolyte W can be prevented from leaking outside through the exhaust tube T. . Moreover, there is also an advantage that manufacturing with a simple mold is easy by forming the cut-out shapes of the communication slits 200A and 200B. In addition, about the minimum of the width | variety of communicating slit 200A, 200B, 1 mm or more is preferable and 3 mm or more is still more preferable. The reason is that if the widths of the communication slits 200A and 200B are narrowed, a liquid film is easily stretched on the communication slit, and it is difficult to function as a communication part.

  In the present embodiment, the width of the upper end of the communication slits 200A and 200B is set to 3 mm or more and the width of the lower end is set to 5 mm or less, and the entire slit width is set to a numerical value within the optimum range (3 mm to 5 mm). Yes.

  The pair of opposing walls 97A and 97B have different sizes, and the opposing wall 97A has a shorter circumference than the opposing wall 97B. This is because the communication slits 200A and 200B are formed by cutting both ends of the facing wall 97A to shorten the circumferential length.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

  (1) In the first and second embodiments, the example in which the lid member 50 includes the inner lid 60 and the upper lid 100 has been described. The inner lid 60 and the upper lid 100 do not necessarily have to be separate bodies, and may be a lid having a structure in which the inner lid 60 and the upper lid 100 are integrated.

  (2) In the first and second embodiments, a battery having a structure in which the battery case 20 is partitioned into a plurality of cell chambers 25 is illustrated as an example of a lead storage battery. In the present invention, a lid member 50 that seals the battery case 20 is formed with a lid body 61, a lid wall 91 that is formed along the opening of the battery case 20 on the lower surface of the lid body 61, and the lid wall 91 is joined to the battery case 20. Any battery having a structure having a separation wall that divides the lower space S of the lid body 61 surrounded by the wall 91 into two spaces can be widely applied, and the battery case 20 is partitioned by the cell chamber 25. The present invention can be applied to a lead storage battery having no structure.

  (3) In the first and second embodiments, “guide members 94A and 94B and the facing wall 97A” are illustrated as an example of the separation wall. The separation wall is on the inner peripheral side of the lid walls 91 and 93, and is connected to the lid walls 91 and 93, whereby the lower space S of the lid body 61 surrounded by the lid walls 91 and 93 is separated into two spaces S1. As long as it is a wall separated into S2, any structural wall may be used. Moreover, it is not necessarily connected as a single wall, and as illustrated in Embodiment 2, a configuration in which a communication slit is provided in a part of the wall surface may be used.

  (4) In the first and second embodiments, the separation walls 94A, 94B, and 97A are connected to the two lid walls 93 located on both sides in the X direction to separate the lower space S of the lid body 61 in the Z direction. Was illustrated. The direction in which the separation wall separates the lower space S of the lid main body 61 may be various patterns depending on the shape of the battery case 20 or the cell chamber 25. For example, the shape of the battery case 20 or the cell chamber 25 is X. If the width of the lid body 61 is larger than a predetermined width, the lower space S of the lid body 61 is separated in the X direction by being connected to two lid walls located on both sides in the Z direction. May be.

  (5) In Embodiment 1, the example which provided the communicating hole 98 with respect to 97A of opposing walls was shown. The communication hole 98 only needs to be provided to the separation wall, and the formation location is not limited to the facing wall 97A. For example, you may make it the structure provided in the guide members 94A and 94B which comprise a separation wall with the opposing wall 97. FIG.

  (6) In the second embodiment, the example in which the communication slits 200A and 200B are provided on both sides of the opposing wall 97A is shown. For example, as shown in FIG. 20, the structure in which the communication slit 210 is provided on the wall surface of the opposing wall 97A. It may be.

  (7) In the first and second embodiments, “inner wall 91” and “partition wall 93” are illustrated as examples of the lid wall. The lid wall may have a shape along the opening of the battery case 20 or the cell chamber 25 in order to seal the battery case 20 or the cell chamber 25. That is, in the first and second embodiments, the example in which the lid wall is provided over the “entire periphery” of the opening is not necessarily the “entire periphery”, and a part of the wall is notched. It may be a configuration.

  (8) In the first embodiment, the example in which the communication hole 98 is provided at a position near the ceiling surface of the lower space S in the facing wall 97A is shown. The communication hole 98 does not necessarily have to be close to the ceiling surface side of the lower space S, and the upper end may be located closer to the ceiling surface than the bottom surface of the lower space S. That is, it suffices if it is at a position closer to L3 than L2 shown in FIG.

DESCRIPTION OF SYMBOLS 10 ... Lead storage battery 15 ... Battery case 20 ... Battery case 25 ... Cell chamber 30P, 30N ... Positive electrode plate, negative electrode plate (an example of "electrode" of this invention)
50 ... Lid member 60 ... Middle lid 61 ... Lid body 81 ... Lower exhaust pipe 91 ... Inner wall (an example of the "lid wall" of the present invention)
93 ... partition wall (an example of the “lid wall” of the present invention)
94A, 94B ... guide member 97A ... opposite wall 97B ... opposite wall 98 ... communication hole (an example of the "communication part" of the present invention)
DESCRIPTION OF SYMBOLS 100 ... Upper cover 131 ... Upper exhaust pipe 200 ... Communication slit (an example of the "communication part" of this invention)
210A, 210B ... Communication slit (an example of the “communication portion” of the present invention)
S ... lower space S1, S2 ... first space, second space T ... exhaust pipe (an example of the "exhaust section" of the present invention)
V ... Droplet W ... Electrolyte

Claims (7)

A lead-acid battery comprising a battery case having an upper surface opened, an electrode and electrolyte contained in the battery case, and a lid member for sealing the battery case,
The lid member is
A lid body;
A lid wall provided on the lower surface side of the lid body along the opening of the battery case and joined to the battery case;
An exhaust section for exhausting gas generated in the battery case;
A lower space of the lid body that is on the inner peripheral side of the lid wall and is connected to the lid wall and surrounded by the lid wall includes a first space having the exhaust portion and a second space not having the exhaust portion. A separation wall that divides into space,
The said separation wall is a lead acid battery which has a communication part which connects the said 1st space and the said 2nd space. The lead acid battery according to claim 1,
The said separation wall is a lead acid battery which has a communicating hole which functions as the said communication part. The lead acid battery according to claim 1,
The separation wall is a lead-acid battery having a communication slit that functions as the communication part. The lead-acid battery according to any one of claims 1 to 3,
The communication part is a lead-acid battery in which at least a part is located in the lower space of the lid body and an upper end is closer to a ceiling surface than a bottom surface of the lower space. The lead-acid battery according to any one of claims 1 to 4,
The battery case has a plurality of partition walls that divide the interior into a plurality of cell chambers,
The exhaust unit is provided for each cell chamber,
The lid wall of the lid member is provided for each opening of the cell chamber,
The separation wall is connected to the lid wall, and for the cell chamber, the lower space of the lid body surrounded by the lid wall is divided into the first space and the second space. It is a lead acid battery as described in any one of Claims 1-5,
The lid member is
The injection hole,
A pair of opposing walls that extend from the edge of the liquid injection hole toward the battery case and share and surround the liquid injection hole;
A guide member connected to the lid wall and positioning the lid wall with respect to the battery case;
One of the opposing walls is a lead storage battery in which the separation wall is configured together with the guide member connected to the lid wall. The lead acid battery according to claim 6,
One said opposing wall which comprises the said separation wall is a lead acid battery which has a communicating hole which functions as the said communication part.

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