JP2017157311A - Lead-acid battery and method of manufacturing lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an electrolyte from leaking to the outside and a control valve from being likely to deteriorate, in lead-acid batteries.SOLUTION: A lead-acid battery 10 with a control valve disclosed according to the present specifications includes: a battery case 12 including a plurality of cell chambers 22 in each of which an electrode plate group 11 including an electrolyte is received; and a collective exhaust tube 44 including a control valve 51 that controls the exhaust of gas discharged from the plurality of cell chambers 22 and the infiltration of outside air. A lid 30 of the battery case 12 is provided with an exhaust path 53 having a bottom 56 partitioning between an introduction port 49 of the collective exhaust tube 44 and the cell chambers 22.SELECTED DRAWING: Figure 3

Description

  The technique disclosed by this specification is related with the manufacturing method of lead acid battery and lead acid battery.

  For example, as a lead storage battery having a collective exhaust port provided with a control valve, one described in Japanese Patent Application Laid-Open No. 2003-288878 (the following Patent Document 1) is known. In this lead storage battery, gas generated in a plurality of cell chambers passes through one cell chamber of the plurality of cell chambers and is discharged to the outside from a collective exhaust port provided in the one cell chamber.

JP 2003-288878 A

  By the way, the inlet of the collective exhaust port of the lead storage battery is configured to face the region in which the electrolytic solution is accommodated in the cell chamber. For this reason, when the lead storage battery is used in an inclined state, the electrolyte in the cell chamber can easily enter the inlet of the collective exhaust port, so that the electrolyte adheres to the control valve as the gas is exhausted. As a result, the control valve is likely to deteriorate.

  In the present specification, a technique for suppressing the electrolytic solution from adhering to the control valve and being easily deteriorated is disclosed.

  The technology disclosed in this specification is a lead storage battery, a case having a cell chamber in which an electrode and an electrolytic solution are accommodated, and a control for controlling discharge of gas discharged from the cell chamber and intrusion of outside air An exhaust pipe having a valve is provided, and the case includes a partition wall that partitions the inlet of the exhaust pipe and the cell chamber.

  According to the technology disclosed in this specification, it is possible to suppress the electrolytic solution from adhering to the control valve and being easily deteriorated.

Perspective view of lead acid battery Plan view AA line sectional view of FIG. Top view of the lid with the cover removed Bottom view of the lid BB sectional view of FIG. CC sectional view of FIG. Bottom view of the lid showing the state before forming the bottom of the exhaust passage

(Outline of this embodiment)
First, an outline of the lead storage battery disclosed in the present embodiment will be described.

  When the lead storage battery is disposed at an angle, the inventors have attempted to identify the cause of the deterioration of the control valve due to the electrolyte adhering to the control valve of the exhaust pipe.

  Then, the inventors observed the infiltration path of the electrolytic solution to the exhaust pipe, and when the lead-acid battery was placed at an inclination, the electrolytic solution approached the inlet of the exhaust pipe, and the electrolytic solution reached the inlet of the exhaust pipe. I found out that it was invading.

Therefore, the present inventors have come up with the idea of providing a partition wall in the case for partitioning between the inlet of the exhaust pipe and the cell chamber in which the electrolyte is accommodated. However, there was no idea in the industry to make a partition wall, for example, because the partition wall could not be made at the same time during molding.
However, the present inventors have found that the partition wall can be produced by a practically practical method, and by blocking the electrolyte solution in the cell chamber by this partition wall, the intrusion of the electrolyte solution from the inlet of the exhaust pipe can be prevented. Suppression was realized. Thereby, for example, compared with the case where the inlet of the exhaust pipe having the control valve faces the cell chamber, the electrolytic solution enters from the inlet of the exhaust pipe having the control valve, and the electrolytic solution adheres to the control valve. It can suppress that it deteriorates or an electrolyte solution leaks outside. The lead storage battery having the above configuration includes a configuration in which an electrolytic solution is injected into the cell chamber when the lead storage battery is used.

As one embodiment of the lead-acid battery disclosed in the present specification, the partition wall is provided continuously to the wall portion of the case, and the space between the inlet of the exhaust pipe and the cell chamber is closed. Also good.
For example, when a hole is opened in the partition wall, there is a disagreement that the electrolyte enters the inlet side of the exhaust pipe through the hole. However, according to the configuration as described above, since the partition wall is closed between the inlet of the exhaust pipe and the cell chamber, the electrolyte can be prevented from entering the inlet side of the exhaust pipe from the cell chamber. .
As one embodiment of the lead-acid battery disclosed in the present specification, the case is provided above the cell chambers and a plurality of the cell chambers, and the gas discharged from the cell chambers is integrated into the case. It is good also as a structure which has an integrated channel | path leading to an exhaust pipe, and the said partition wall is a part of bottom part in the said integrated channel.

  With such a configuration, the bottom of the integrated passage that integrates the gases discharged from the plurality of cell chambers and guides them to the exhaust stack, so that the electrolyte is blocked and the electrolyte enters from the inlet of the exhaust stack having the control valve. Can be prevented. As a result, for example, compared with the case where the integrated passage and the partition wall are provided separately, the structure of the lead storage battery is simplified, and the control valve is likely to be deteriorated due to the electrolytic solution adhering to the control valve. Can be suppressed.

  As one embodiment of the lead storage battery disclosed in the present specification, the integrated passage includes an integrated portion in which gases discharged from exhaust ports provided in the plurality of cell chambers are integrated, and an inlet of the exhaust pipe And an exhaust passage that connects the integrated portion, and a projecting portion that protrudes into the integrated portion is provided between the exhaust port and the exhaust passage in the integrated portion. It is good.

  According to such a configuration, the electrolyte solution leaking out of the cell chamber from the exhaust port together with the gas is blocked by the projecting portion projecting into the integrated portion, and the electrolyte solution can be prevented from entering the exhaust path. Thereby, it can further suppress that electrolyte solution permeates into the entrance of an exhaust pipe.

  As one embodiment of the lead storage battery disclosed in the present specification, the exhaust port opens upward when the side where the cell chamber is disposed in the case is the lower side, and the exhaust tube The inlet may be configured to open downward and be disposed below the exhaust port, and the protruding portion may be provided to protrude upward from the exhaust port.

  According to such a configuration, as compared with the case where the projecting portion projects downward in the integrated portion, the projecting portion blocks the electrolyte leaking from the exhaust port to the outside of the cell chamber, and from the exhaust port to the exhaust tube. The creepage distance can be increased by meandering the path to the entrance in the vertical direction. Thereby, it can further suppress that electrolyte solution permeates into the entrance of an exhaust pipe.

  Further, the technology disclosed in this specification includes a case having a cell chamber in which an electrode and an electrolytic solution are accommodated, and a discharge valve having a control valve that controls discharge of gas discharged from the cell chamber and intrusion of outside air. A lead-acid battery manufacturing method comprising: a cylinder; and the case having a partition wall provided in the case so as to partition an inlet of the exhaust pipe and the cell chamber, wherein the partition wall includes the case The peripheral wall projecting from the outer peripheral portion of the inlet of the exhaust pipe into the cell chamber is melted and connected.

  According to such a configuration, since the partition wall can be formed by melting and connecting the peripheral walls, for example, compared with the case where a partition member is provided by attaching a plate member or the like to the protruding end portion of the peripheral wall. The score can be reduced.

  As one embodiment of the method for manufacturing a lead-acid battery disclosed in the present specification, a case body in which the electrode and the electrolytic solution are accommodated and a lid body to be assembled to the case body are thermally welded to form the case. It has a welding process to constitute, and the partition wall may be formed in the welding process.

  According to such a configuration, when forming the case by welding the case main body and the lid in the welding step, the partition wall can be formed at the same time. For example, a plate member or the like is formed on the protruding end of the peripheral wall. Compared with the case where the partition wall is formed by pasting with an adhesive, the work process for forming the partition wall can be reduced.

<Embodiment 1>
Embodiments disclosed in this specification will be described with reference to FIGS. 1 to 8.
This embodiment is a lead-acid battery with a control valve (an example of a “lead-acid battery”) 10 for a motorcycle, and supplies electric power to equipment such as the start of the motorcycle and the electrical components mounted on the motorcycle. is there.

  A lead-acid battery with a control valve (hereinafter, also simply referred to as “lead-acid battery”) 10 has a substantially rectangular parallelepiped block shape as shown in FIG. 1, and as shown in FIG. It is configured to include an electrolytic solution made of sulfuric acid and a battery case (an example of a “case”) 12 that accommodates these. In the following description, the long side direction of the battery case 12 is the X direction, the height direction of the battery case 12 is the Z direction, the depth direction of the battery case 12 is the Y direction, and the right front in FIG. The front side will be described as the left side in the figure as the rear side in the Y direction.

The battery case 12 is made of synthetic resin, and has a box-shaped case body 20 that opens upward and a lid body 30 that closes the upper end opening of the case body 20 as shown in FIG. 3. .
The case main body 20 is provided with a plurality (six in this embodiment) of a plurality of cell chambers 22 partitioned by a plurality of (five in the present embodiment) partition walls 21 and arranged in the X direction. Contains the electrode plate group 11 and the electrolyte.

  The electrode plate group 11 includes a negative electrode plate (an example of an “electrode”) 11N and a positive electrode plate (an example of an “electrode”) 11P, and a negative electrode plate 11N and a positive electrode plate formed by applying a paste-like active material to a lattice body. 11P and a separator 11C interposed between them. Further, as shown in FIG. 3, the electrode plate group 11 is configured by alternately stacking a plurality of negative plates 11N and a plurality of positive plates 11P in the X direction via separators 11C.

  The separator 11C is a nonwoven fabric or a woven or knitted fabric containing glass fibers, and the electrolyte solution is held in the electrode plate group 11 by impregnating the separator 11C and the electrode plates 11N and 11C with the electrolyte solution. In this embodiment, the electrolytic solution is impregnated in the separator 11C. However, the electrolytic solution may be injected at the time of use.

  The connection part 13 is provided in the upper part of each electrode plate 11P and 11N, and the connection part 14 extended in a X direction is connected to this connection part 13 for every polarity, and the electrode plates of the same polarity are mutually connected. It is connected. In addition, an inter-cell connecting body 14A that penetrates the partition wall 21 of the cell chamber 22 in the X direction is provided at the end portion in the X direction of the connecting portion 14, and the inter-cell connecting body 14A allows The accommodated electrode plate groups 11 are connected in series.

  Of the cell chambers disposed at both ends in the X direction of the case body 20, the connecting portion 14 on the positive electrode side of the cell chamber 22 disposed on the right side is connected to a positive electrode terminal portion 34P described later and disposed on the left side. The connecting portion 14 on the negative electrode side of the cell chamber 22 is connected to a negative electrode terminal portion 34N described later.

  As shown in FIG. 3, the lid 30 is formed slightly larger than the upper peripheral edge 20 </ b> A of the case body 20, and a plate-like shape is formed on the lower surface of the lid 30 as shown in FIGS. 5 and 8. A plurality of lid-side partition walls 31 are provided side by side in the X direction. The lid-side partition wall 31 is disposed at a position corresponding to the partition wall 21 of the case body 20, the lower end portion 31 </ b> A of the lid-side partition wall 31, the upper end portion 21 </ b> A of the partition wall 21 in the case body 20, and the lower end peripheral edge portion 30 </ b> A of the lid body 30. The battery case 12 is configured by attaching the lid 30 to the upper end of the case body 20 by thermally welding the upper peripheral edge 20A of the case body 20.

  Further, the lid body 30 has a shape with a difference in height. As shown in FIGS. 1 and 2, the lid body 30 is provided with a high surface portion 32 to which a cover 60 having a convex shape in plan view is attached, and higher than the high surface portion 32. And a lower surface portion 33 provided at a position lowered by one step. The low surface portion 33 is provided at both ends of the lid body 30 on the front side in the Y direction, and the low surface portion 33 is provided with a pair of terminal portions 34 to which harness terminals (not shown) are connected. Each terminal portion 34 has a rectangular shape, and of the pair of terminal portions 34, the right terminal portion 34 is a positive terminal portion 34P, and the left terminal portion 34 is a negative terminal portion 34N. .

  As shown in FIG. 1, the high surface portion 32 is formed in a convex shape in plan view with a substantially central portion in the X direction protruding forward in the Y direction, and as shown in FIG. 4, the Y surface in the upper end portion of the high surface portion 32. A mounting groove 35 having a convex shape in a plan view is provided in which the cover 60 is mounted from a substantially central portion to a front portion in the Y direction.

  As shown in FIG. 3, the mounting groove 35 has a form that is one step lower than the upper surface 32 </ b> A of the high surface portion 32. In the mounting groove 35, as shown in FIGS. 3 and 4, An outer peripheral wall 36 is provided that rises upward from the bottom wall 35A. The outer peripheral wall 36 is formed so as to be along the outer peripheral edge of the mounting groove 35 with a height dimension slightly lower than the upper surface 32 </ b> A of the high surface portion 32.

  On the other hand, as shown in FIGS. 2 and 3, the cover 60 is formed in a convex plate shape that is slightly smaller than the inner peripheral shape of the mounting groove 35, and has a lower surface of the cover 60 and the outer peripheral wall 36. The cover 60 is fixed to the lid 30 by thermally welding the upper end portion 36A. Therefore, when the cover 60 is attached to the lid 30, the space between the outer peripheral wall 36 and the cover 60 is closed as shown in FIG. 3, and a slight gap is formed between the attachment groove 35 and the cover 60. Arise.

  As shown in FIG. 4, a plurality of individual exhaust cylinders 38 each having an exhaust port 37 at the upper end are arranged side by side in each cell chamber 22 at the position on the rear side in the Y direction of the mounting groove 35 in the outer peripheral wall 36 (this embodiment). Then there are 6). As shown in FIG. 3, each individual exhaust cylinder 38 has a substantially cylindrical shape that penetrates the bottom wall 35 </ b> A of the mounting groove 35 in the lid body 30 in the Z direction, and injects electrolyte into the cell chamber 22. At this time, the electrolytic solution is injected from the exhaust port 37 through the individual exhaust cylinder 38. The gas generated in the cell chamber 22 passes through the individual exhaust cylinder 38 and is then exhausted upward from the cell chamber 22 through the exhaust port 37.

  As shown in FIG. 3, a pair of slits 38 </ b> A extending in the Z direction are provided on both side surfaces of the individual exhaust pipe 38 in the Y direction. An inclined wall 39 that is inclined toward the side is provided. Therefore, when the electrolytic solution is injected from the exhaust port 37, the electrolytic solution is guided obliquely forward and downward by the inclined wall 39 and smoothly poured into the cell chamber 22 from the slit 38A.

  As shown in FIG. 4, intermediate walls 40 that partition between the exhaust ports 37 adjacent to each other in the X direction are provided on the inner surface of the outer peripheral wall 36 that faces the Y direction. Each intermediate wall 40 is provided with the same height as the outer peripheral wall 36, and the intermediate wall 40 is similar to the outer peripheral wall 36 when the cover 60 is fixed to the lid body 30 by heat welding. Heat-welded. As shown in FIGS. 3, 4 and 6, each intermediate wall 40 is provided with a communication groove 41 penetrating in the X direction, and these communication grooves 41 are adjacent to each other as shown in FIG. 4. The communication grooves 41 are arranged in a staggered manner so as not to overlap when viewed from the X direction.

  Therefore, the integrated portion 42 constituted by the Y-direction rear portion of the outer peripheral wall 36 and the Y-direction rear portion of the cover has a space inside thereof as shown in FIGS. 4 and 7. The groove 41 communicates in the X direction, and as shown in FIG. 3, is a space in which the gas discharged from each cell chamber 22 is integrated.

  Further, the substantially central portion in the X direction at the front end portion in the Y direction of the outer peripheral wall 36 is a curved portion 43 that is curved in an arc shape toward the rear in the Y direction, as shown in FIG. The curved portion 43 is aligned in the Y direction with the exhaust port 37 of the cell chamber (the third cell chamber 22 from the right in FIG. 4 in the present embodiment) 22 arranged in the center of the plurality of cell chambers 22. A collective exhaust pipe (an example of an “exhaust pipe”) 44 that exhausts the gas integrated in the integrated section 42 to the outside is provided on the Y direction front side (outside) of the curved portion 43. Is provided. In other words, the collective exhaust pipe 44 is provided in the upper part of the cell chamber 22 arranged in the central portion of the plurality of cell chambers 22.

As shown in FIG. 3, the collective exhaust tube 44 is formed in a substantially cylindrical shape having a bottom plate 45, and extends downward from the bottom wall 35 </ b> A of the mounting groove 35, which is the bottom side of the cell chamber 22. It is in the form.
The upper end portion of the collective exhaust tube 44 is a large-diameter portion 46 in which the porous filter F is accommodated, and the lower portion of the collective exhaust tube 44 is a small-diameter portion 47 having a slightly smaller diameter than the large-diameter portion 46. .

The bottom plate 45 is provided at the lower end of the small-diameter portion 47, and an introduction port (an example of an “inlet”) 49 through which gas is introduced penetrates the bottom plate 45 in the Z direction at the center of the bottom plate 45. ing.
As shown in FIG. 3, a substantially cylindrical mounting cylinder 50 to which the control valve 51 is mounted is formed on the outer periphery of the introduction port 49 so as to extend upward from the bottom plate 45. As shown in FIG. Cutout grooves 52 having a substantially rectangular shape are provided at a total of four locations on both ends in the X direction and both ends in the Y direction at the upper end edge of the mounting cylinder 50.

  As shown in FIG. 3, the control valve 51 is made of rubber and has a cap shape that can be mounted on the mounting cylinder 50 from above. When the control valve 51 is mounted on the mounting cylinder 50, The inner peripheral surface 51 </ b> A of 51 is in close contact with the outer peripheral surface 50 </ b> A of the mounting cylinder 50. Accordingly, in a normal state, the inner peripheral surface 51A of the control valve 51 is in close contact with the outer peripheral surface 50A of the mounting cylinder 50, so that the collective exhaust pipe 44 is closed and is the upper end portion of the collective exhaust pipe 44. It is controlled that outside air enters from the gas outlet 44 </ b> A toward the inlet 49. When the gas pressure in the mounting cylinder 50 becomes higher than the pressure outside the control valve 51, the gas is discharged from between the control valve 51 and the mounting cylinder 50 to the outside of the control valve 51 through each notch groove 52 and discharged. The gas is controlled to be discharged to the outside through the gap between the cover 60 and the mounting groove 35 through the porous filter F and the outlet 44A of the collective exhaust pipe 44.

  In the present embodiment, an exhaust path 53 is formed between the inlet of the collective exhaust pipe 44 and the cell chamber 22 so as to connect the integrated portion 42 and the inlet 49 of the collective exhaust pipe 44.

  As shown in FIG. 3, the exhaust passage 53 has a substantially L-shaped cross section extending upward from the lower side of the introduction port 49 of the collective exhaust tube 44 along the rear side surface in the Y direction of the collective exhaust tube 44. As shown in FIG. 4, the exhaust path 53 opens between the curved portion 43 and an exhaust port 37 (exhaust port 37 aligned with the curved portion 43 and the Y direction) 37 disposed behind the curved portion 43 in the Y direction. The substantially rectangular communication port 54 and the introduction port 49 of the collective exhaust pipe 44 communicate with only the integration 42 and the collective exhaust pipe 44.

Specifically, the exhaust path 53 includes a peripheral wall 55 that is substantially rectangular in a bottom view and is closed in the circumferential direction so as to collectively surround the introduction port 49 and the communication port 54 of the collective exhaust tube 44, and a lower end portion 55 </ b> A of the peripheral wall 55. And a bottom portion 56 (an example of a “partition wall”) 56 provided in the housing.
The peripheral wall 55 is configured to extend downward from the bottom wall 35 </ b> A of the mounting groove 35 and the bottom plate 45 of the collective exhaust pipe 44, and the bottom portion 56 is connected to the lower end portion 55 </ b> A of the peripheral wall 55 over the entire circumference. Are formed in a substantially rectangular plate shape elongated in the Y direction.

  That is, the inlet 49 of the collective exhaust tube 44 and the cell chamber 22 are partitioned and completely closed by the bottom portion (an example of “partition wall”) 56 of the exhaust passage 53 as shown in FIG. The gas discharged from the exhaust port 37 of each cell chamber 22 is integrated in the integration unit 42, enters the exhaust path 53 from the communication port 54, passes through the exhaust path 53, and the collective exhaust pipe from the introduction port 49. 44 is entered.

  That is, it is possible to guide the gas from the integrated portion 42 to the introduction port 49 of the collective exhaust tube 44 while guiding the electrolyte in the cell chamber 22 from directly entering the introduction port 49 of the collective exhaust tube 44. It can be done.

  When the gas pressure in the mounting cylinder 50 of the gas that has entered the collective exhaust cylinder 44 becomes higher than the pressure outside the control valve 51, the gas is discharged to the outside of the control valve 51, and the discharged gas is perforated. The air passes through the quality filter F and the outlet 44 </ b> A of the collective exhaust pipe 44, and is discharged to the outside through a gap between the cover 60 and the mounting groove 35.

  That is, the integrated portion 42 and the exhaust passage 53 constitute an integrated passage 57 that integrates the gases discharged from the plurality of cell chambers 22 and leads them to the collective exhaust tube 44, while the electrolyte in the cell chamber 22 is collectively discharged. Direct entry into the inlet 49 of the cylinder 44 is prevented by the bottom 56 of the exhaust passage 53.

  In addition, a pair of intermediate walls 40 disposed on both sides in the X direction of the communication port 54 are provided on the bottom wall 42B of the integrated portion 42 between the communication port 54 and the exhaust port 37 disposed on the rear side in the Y direction of the curved portion 43. A protruding wall (an example of a “protruding portion”) 58 that connects the two in the X direction is provided. The protruding wall 58 protrudes upward from the bottom wall 42B and extends straight in the X direction so as to face the communication port 54. The protruding dimension of the protruding wall 58 is larger than that of the outer peripheral wall 36 and the intermediate wall 40. Is set slightly smaller. Therefore, the projecting end 58A of the projecting wall 58 is disposed above the position opposite to the cell chamber 22 with respect to the position of the exhaust port 37. When the cover 60 is fixed to the outer peripheral wall 36, the projecting wall 58 is provided. A slight gap is formed between the protruding end portion 58 </ b> A and the cover 60.

  That is, even if the electrolyte is discharged from the exhaust port 37 together with the gas into the integrated part 42, the electrolytic solution in the integrated part 42 is blocked by the protruding wall 58 and the electrolyte enters the communication port 54. Is to be prevented. Further, according to the present embodiment, the protruding end 58 </ b> A of the protruding wall 58 is disposed at a position higher than the position of the exhaust port 37, and the gas path in the integrated passage 57 including the integrated portion 42 and the exhaust path 53 is established. Since it is configured to meander in the Z direction, the creeping distance from the exhaust port 37 of each cell chamber 22 to the introduction port 49 of the collective exhaust tube 44 is long. Thereby, for example, compared with the case where the protruding end portion of the protruding wall is the same as the position of the exhaust port or disposed below the position of the exhaust port, the electrolyte enters the introduction port 49 of the collective exhaust tube 44. This can be further suppressed.

This embodiment is the above composition, and explains the manufacturing method of lead storage battery 10 Next, in manufacture of lead storage battery 10, the electrode plate which connected each electrode plates 11P and 11N with connecting part 14 first. The group 11 is inserted into each cell chamber 22 of the case main body 20, and the inter-cell connection body 14 </ b> A of each connecting portion 14 is connected between the cell chambers 22. Connect in series for each polarity.

Next, when the electrode plate group 11 is connected in series for each polarity, the case body 20 and the lid body 30 are thermally welded by a welding process.
In the welding step, first, a heated hot plate (not shown) is used, with the upper end peripheral portion 20A of the case body 20 and the upper end portion 21A of the partition wall 21 of the case body 20, the lower end peripheral portion 30A of the lid 30 and the lower end of the lid side partition wall 31. It arrange | positions between 31A of parts. At this time, the exhaust path 53 is not formed below the collective exhaust pipe 44, and only the peripheral wall 55 is provided at the position of the exhaust path 53 as shown in FIG. Yes. In other words, the bottom portion 56 is not provided at the lower end portion 55 </ b> A of the peripheral wall 55, and the inlet 49 of the collective exhaust pipe 44 faces downward through the peripheral wall 55.

  Next, the upper end peripheral portion 20A of the case body 20 and the upper end portion 21A of the partition wall 21 of the case body 20, and the lower end peripheral portion 30A of the lid body 30 and the lower end portion 31A of the lid side partition wall 31 are placed on the surface of the hot plate for a certain period of time. Make contact. At this time, the lower end portion 55A of the peripheral wall 55 is also brought into contact with an unillustrated exhaust path forming portion provided on the hot plate.

  Then, when the upper end peripheral portion 20A of the case main body 20, the upper end portion 21A of the partition wall 21 of the case main body 20, the lower end peripheral portion 30A of the lid 30 and the lower end portion 31A of the lid side partition 31 are melted, they are aligned. Touch. Thereby, the upper end peripheral part 20A of the case body 20 and the lower end peripheral part 30A of the lid body 30, the upper end part 21A of the partition wall 21 and the lower end part 31A of the lid side partition wall 31 are thermally welded, respectively. Attached to the upper end. Further, the lower end portion 55A of the peripheral wall 55 is welded so that the lower end portions 55A of the peripheral wall 55 are connected to each other by melting, and the bottom portion 56 of the exhaust passage 53 is closed so that the lower end portion 55A of the peripheral wall 55 is closed. Is formed.

Next, an electrolytic solution is injected from the exhaust port 37, the electrolytic solution is impregnated in the electrode plate group 11, and the cover 60 is attached to the lid 30.
In the mounting process of the cover 60, the hot plate is brought into contact with the upper end portion 36 </ b> A of the outer peripheral wall 36 and the upper end portion 40 </ b> A of the intermediate wall 40 and the lower surface of the cover 60 for a predetermined time. Then, when each of them is melted, the cover 60 is brought into contact with the outer peripheral wall 36 and the intermediate wall 40, whereby the cover 60 is fixed to the lid 30 by heat welding, and the lead storage battery 10 is completed.

Next, the operation and effect of the lead storage battery 10 will be described.
In general, in the case of a lead-acid battery in which the separator is impregnated with an electrolyte, the gas generated in the electrode plate group may enter the separator and the electrolyte in the separator may be pushed out. Liquid appears at the top of the cell chamber.
For this reason, in the case of a lead storage battery in which the inlet of the exhaust pipe with the control valve faces the cell chamber, if the lead storage battery is used in an inclined state, the electrolyte collected in the upper part of the cell chamber is discharged from the inlet of the exhaust pipe. Intrusion into the exhaust pipe and leakage to the outside, or the electrolytic solution adheres to the control valve, the control valve is likely to deteriorate.

However, the lead storage battery 10 of the present embodiment has an exhaust having a bottom portion 56 that partitions between the introduction port 49 of the collective exhaust tube 44 and the cell chamber 22 between the introduction port 49 of the collective exhaust tube 44 and the cell chamber 22. A passage 53 is provided, and the gas integrated in the integration unit 42 is guided to the introduction port 49 of the collective exhaust pipe 44 through the exhaust passage 53.
That is, even when the lead storage battery 10 is used in an inclined state, the electrolytic solution in the cell chamber 22 can be prevented from directly entering the introduction port 49 of the collective exhaust tube 44, and the integration unit 42. The gas can be guided to the inlet 49 of the collective exhaust pipe 44. As a result, the control valve 51 deteriorates as the electrolytic solution adheres to the control valve 51, or the electrolytic solution leaks to the outside as the control valve 51 opens and gas is discharged from the collective exhaust tube 44. Can be suppressed.
By the way, as in the present embodiment, the cover body is provided with a collective exhaust pipe that discharges gas from the cell chamber, and a partition wall that prevents the electrolyte from entering below the inlet of the collective exhaust pipe is provided. In this case, the lid cannot be formed by a single resin molding, and a separate operation is required only for forming the partition wall. For this reason, generally, there is no idea of forming only the partition wall, and formation of the partition wall has been avoided.
However, according to the present embodiment, in the welding step of thermally welding the lid body 30 to the case body 20, the lower end portions 55A of the peripheral walls 55 provided on the lid body 30 are melted, and the lower end portions 55A of the peripheral walls 55 are joined together. It has been found that it can be produced by a practically practical method of welding together. That is, a bottom portion 56 of the exhaust passage 53 that guides and guides gas from the integrated portion 42 to the introduction port 49 of the collective exhaust tube 44 is formed below the collective exhaust tube 44, and the bottom portion 56 of the exhaust passage 53 is collectively discharged. It was decided to function as a partition wall for partitioning between the introduction port 49 of the cylinder 44 and the cell chamber 22.

  That is, since the bottom portion 56 can function as the bottom portion 56 of the exhaust path 53, it can function as a partition wall that partitions between the introduction port 49 of the collective exhaust pipe 44 and the cell chamber 22. For example, a partition wall is provided. Therefore, it is possible to prevent separate work from occurring. Further, for example, the structure of the lead storage battery 10 can be simplified as compared with a case where a partition wall for partitioning between the inlet of the collective exhaust pipe and the cell chamber is provided separately from the exhaust path.

Even if the electrolyte is discharged from the exhaust port 37 of each cell chamber 22 together with the gas into the integrated unit 42, the electrolytic solution in the integrated unit 42 is provided between the exhaust port 37 and the communication port 54. Since the electrolytic solution can be prevented from entering the communication port 54 by being blocked by the projected wall 58, the electrolytic solution can be further prevented from entering the introduction port 49 of the collective exhaust tube 44.
Furthermore, since the protruding end 58A of the protruding wall 58 in the integrated portion 42 is disposed above the position opposite to the cell chamber 22 from the position of the exhaust port 37, the integrated passage 57 meanders in the Z direction. Therefore, the creeping distance from the exhaust port 37 of each cell chamber 22 to the inlet 49 of the collective exhaust tube 44 can be increased, and the intrusion of the electrolyte into the inlet 49 of the collective exhaust tube 44 can be further suppressed.
In general, a lead storage battery including a control valve that controls the discharge of gas discharged from the cell chamber and the entry of outside air has a much smaller amount of electrolyte in the cell chamber than a liquid lead storage battery. ing. Therefore, also in this embodiment, a large amount of electrolyte does not enter the integrated portion 42 from the exhaust port 49, and the electrolyte that has entered the integrated portion 42 gets over the protruding wall 58 and enters the communication port 54. Even so, the amount is very small. Therefore, it is possible to use the lead storage battery without any problem even if a small amount of the electrolytic solution does not flow back to the cell chamber and is left in the air passage 53 as it is. it can.

  Moreover, according to this embodiment, in the welding process in which the lid 30 is thermally welded to the case body 20, the bottom portion 56 of the exhaust passage 53 can be formed at the same time. The number of parts can be reduced and the work process for forming the bottom portion 56 of the exhaust path 53 can be reduced as compared with the case where the bottom portion is formed by pasting them with an adhesive.

<Other embodiments>
The technology disclosed in the present specification is not limited to the embodiments described with reference to the above description and drawings, and includes, for example, the following various aspects.
(1) In the above embodiment, the gas discharged from the plurality of cell chambers 22 is integrated and discharged from the collective exhaust tube 44. However, the present invention is not limited to this, and an exhaust pipe that exhausts gas to the outside may be provided for each cell chamber, and an integrated passage may be formed between the inlet and the exhaust port of the exhaust pipe.

(2) In the above embodiment, the collective exhaust pipe 44 is provided at the front portion in the Y direction of the lid body 30. However, the present invention is not limited to this, and the collective exhaust pipe may be configured near the center of the lid in the Y direction.
(3) In the embodiment described above, a single protruding wall 58 is provided in the integrated portion 42 of the integrated passage 57. However, the present invention is not limited to this, and a protruding wall may be provided in the exhaust passage of the integrated passage, and the number of protruding walls may be two or more.
(4) In the said embodiment, the lead storage battery 10 with a control valve for motorcycles was shown as an example. However, the present invention is not limited to this, and the technology disclosed in this specification may be applied to a lead storage battery with a control valve other than for a motorcycle as long as it is a lead storage battery with a control valve.
(5) In the said embodiment, it was set as the structure which forms the bottom part 56 of the exhaust path 53 by welding the lower end parts 55A of the surrounding wall 55 in the cover body 30 mutually. However, the present invention is not limited to this, and the bottom portion of the exhaust passage may be formed by melting and connecting a part of the peripheral wall such as an intermediate portion of the peripheral wall.

10: Lead storage battery with control valve 11N: Negative electrode plate (an example of “electrode”)
11P: Positive electrode plate (an example of “electrode”)
12: Battery case (an example of “case”)
20: Case body 22: Cell chamber 30: Lid 37: Exhaust port 42: Integration unit 44: Collective exhaust pipe (an example of an "exhaust pipe")
49: Inlet (an example of “entrance”)
51: Control valve 53: Exhaust passage 55: Peripheral wall 56: Bottom of exhaust passage (an example of “partition wall”)
57: Integrated passage 58: Protruding wall (an example of “protruding portion”)
58A: protruding end

Claims (7)

A case having a cell chamber in which an electrode and an electrolytic solution are accommodated;
An exhaust pipe having a control valve for controlling discharge of gas discharged from the cell chamber and intrusion of outside air;
The said case is a lead acid battery which has a partition wall which partitions off between the inlet_port | entrance of the said exhaust pipe, and the said cell chamber.   The lead-acid battery according to claim 1, wherein the partition wall is provided continuously to the wall portion of the case and closes between an inlet of the exhaust pipe and the cell chamber. The case is
A plurality of the cell chambers;
An integrated passage that is provided above the cell chamber and integrates the gas discharged from the plurality of cell chambers and leads to the exhaust pipe;
The lead storage battery according to claim 1, wherein the partition wall is a part of a bottom portion of the integrated passage. The integrated passage has an integrated portion that integrates gases discharged from exhaust ports provided in the plurality of cell chambers, and an exhaust passage that connects the inlet of the exhaust pipe and the integrated portion, respectively. And
The lead acid battery according to claim 3, wherein a protruding portion that protrudes into the integrated portion is provided between the exhaust port and the exhaust passage in the integrated portion. The exhaust port is open upward when the side where the cell chamber is arranged in the case is the lower side,
The inlet of the exhaust pipe is disposed below the exhaust port in a form opening downward.
The lead storage battery according to claim 4, wherein the protruding portion protrudes upward from the exhaust port. A case having a cell chamber in which an electrode and an electrolytic solution are accommodated, an exhaust pipe having a control valve for controlling discharge of gas discharged from the cell chamber and intrusion of outside air, an inlet of the exhaust pipe, and the cell chamber A lead-acid battery manufacturing method having a partition wall provided in the case so as to partition between,
The partition wall is a method of manufacturing a lead-acid battery formed by melting and connecting peripheral walls protruding toward the cell chamber so as to surround the inlet of the exhaust pipe in the case. A welding process for forming the case by thermally welding a case body in which the electrode and the electrolytic solution are housed, and a lid body assembled to the case body;
The lead-acid battery manufacturing method according to claim 6, wherein the partition wall is formed in the welding step.

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