WO2019203090A1

WO2019203090A1 - Lid of lead storage battery and lead storage battery

Info

Publication number: WO2019203090A1
Application number: PCT/JP2019/015635
Authority: WO
Inventors: 歩宮崎; 寺田　正幸; 晃輔磯部
Original assignee: 日立化成株式会社
Priority date: 2018-04-17
Filing date: 2019-04-10
Publication date: 2019-10-24
Also published as: JPWO2019203090A1

Abstract

A lid 3 of a lead storage battery 1 is provided with: a lower lid part 10; an upper lid part 20 which forms exhaust chambers D1-D6 with the lower lid part 10; and a flow path part 5 for circulating liquid between the exhaust chambers D1-D6. The flow path part 5 is open on the upper lid 20 side. In the upper lid 20, an exhaust hole H1 which connects the exhaust chamber D1 and an exterior space to discharge gas to the outside, and to which a catalyst A1 for liquefying the gas is attached. In the posture of the lid 3 when attached to an upper part of a battery container 2, an opening H1a on the exhaust chamber D1 side of the exhaust hole H1 is located above the flow path part 5, and overlaps the flow path part 5 when viewed along a vertical direction.

Description

Lead-acid battery lid and lead-acid battery

The present disclosure relates to a lead-acid battery lid and a lead-acid battery.

For example, as described in Patent Document 1, there is a lead storage battery mounted on an automobile or the like. Such a lead storage battery includes a battery case having a plurality of cell chambers for storing an electrode group, an electrolytic solution, and the like, and a lid for closing the opening of the battery case. The lid has a double lid structure including a first lid portion and a second lid portion that is superimposed on the upper surface of the first lid portion. An exhaust chamber is provided between the first lid and the second lid. In the lead storage battery, water vapor of the electrolytic solution generated in the cell chamber is stored in the exhaust chamber, and the electrolytic solution liquefied in the exhaust chamber is returned to each cell chamber.

JP 2007-165091 A

Here, the lid of the lead-acid battery is provided with an exhaust hole for suppressing an increase in internal gas pressure. When the water vapor of the electrolytic solution, hydrogen gas, oxygen gas, or the like generated by the electrolytic reaction of the electrolytic solution is discharged to the outside from the exhaust hole of the lid, the electrolytic solution in the cell chamber decreases. For this reason, in this field | area, it is calculated | required to suppress the fall of electrolyte solution. Moreover, in the lead acid battery which has a several cell chamber, it is calculated | required to suppress the dispersion | variation in the liquid level height of the electrolyte solution in each cell chamber.

Therefore, in the present disclosure, a lid for a lead storage battery and a lead storage battery that can suppress variations in the liquid level of the electrolyte while suppressing a decrease in the electrolyte will be described.

One aspect of the present disclosure is a lead-acid battery lid that is attached to an upper part of a battery case having a plurality of cell chambers, the first lid part that is attached to the upper part of the battery case, and the first lid part, A second lid that forms a plurality of exhaust chambers between the first lid and the first lid, and a second lid that extends between the plurality of exhaust chambers and that circulates the liquid. A reflux hole penetrating from the exhaust chamber toward the surface of the first lid that is superimposed on the battery case, is provided in each of the plurality of exhaust chambers. The first lid portion or the second lid portion is provided with an exhaust hole to which the exhaust chamber and the external space are connected to discharge the gas in the exhaust chamber to the outside and to which a liquefying portion for liquefying the gas is attached. The part is open on the second lid side, and in the posture when attached to the upper part of the battery case, Opening of the exhaust chamber side overlaps the flow path portion when together located above the channel portion, as viewed in the vertical direction.

The lid of this lead storage battery can change the gas that has entered the exhaust hole from the exhaust chamber into a liquid by the liquefaction unit. The liquid changed by the liquefaction unit returns to the exhaust chamber from the opening on the exhaust chamber side of the exhaust hole. Here, in the attitude of the lid when attached to the upper part of the battery case, the opening on the exhaust chamber side of the exhaust hole is located at the upper part of the flow path part, and when viewed along the vertical direction, the flow path part It overlaps with. That is, the lid of the lead storage battery can drop the liquid onto the flow path portion from the opening on the exhaust chamber side of the exhaust hole. And since the upper part (2nd cover part side) of a flow-path part is opening, when the quantity of the liquid on a flow-path part increases and a liquid overflows from the upper part of a flow-path part, a liquid will flow into an exhaust chamber. . Here, the flow path portion extends over a plurality of exhaust chambers. For this reason, the lid of the lead-acid battery can flow the liquid into the exhaust chamber other than the exhaust chamber located immediately below the opening on the exhaust chamber side of the exhaust hole via the flow path portion. And the lid | cover of this lead acid battery can return the liquid which flowed into each exhaust chamber to each cell chamber via a reflux hole. Thus, the lid | cover of this lead storage battery can suppress the reduction | decrease of electrolyte solution by providing a liquefying part. Moreover, since the lid | cover of this lead storage battery can flow a liquid to each exhaust chamber by a flow-path part, the dispersion | variation in the liquid level height of electrolyte solution can be suppressed.

In this lead-acid battery lid, the first lid rises from the main body covering the upper part of the battery case toward the second lid, and forms an exhaust chamber between the second lid and the body. A channel wall, and the flow path portion rises from the main body portion toward the second lid portion side, and forms a flow channel for flowing a liquid on the main body portion, and It may be comprised including. In this case, the lid of the lead storage battery can cause the main body portion of the first lid portion to function as the bottom portion of the flow path portion.

In the lid of the lead storage battery, the liquefaction unit may be a catalyst that generates water by catalytic action using hydrogen gas and oxygen gas, or a filter that inhibits the flow of water vapor in the electrolyte. In this case, the lid of the lead storage battery can change the gas into a liquid using a catalyst or a filter.

A lead storage battery according to another aspect of the present disclosure includes the above-described lead storage battery lid. In this case, the lead storage battery can suppress variations in the liquid level of the electrolytic solution while suppressing a decrease in the electrolytic solution.

According to various aspects of the present disclosure, it is possible to suppress variations in the liquid level of the electrolytic solution while suppressing a decrease in the electrolytic solution.

FIG. 1 is a perspective view showing a lead storage battery according to an embodiment. FIG. 2 is a perspective view showing the battery case of FIG. FIG. 3 is a top view showing a lower lid portion of the lid of FIG. 4 is a view of the upper lid portion of the lid of FIG. 1 as viewed from the lower side (side overlapped with the lower lid portion). FIG. 5 is a cross-sectional view taken along the line IV-IV in FIG. 3 and showing the positional relationship between the flow path and the opening. FIG. 6 is a view of the upper lid portion of the modified example as viewed from the lower side (side overlapped with the lower lid portion). FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. 6 and showing the positional relationship between the flow path part and the opening part. FIG. 8 is a top view showing a lower lid portion of a modified example.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. Further, in the following description, “upper” and “lower” are the usage states of the lead-acid battery, that is, the vertical direction in the posture of each part when the lid is attached to the upper part of the battery case.

As shown in FIG. 1 and FIG. 2, the lead storage battery 1 is a liquid lead storage battery. The lead storage battery 1 includes a battery case 2 whose upper surface is open, a lid (lid cover for the lead storage battery) 3 that closes the opening of the battery case 2, and a plurality of electrode groups 4 housed inside the battery case 2. In addition, in FIG. 1, in order to show the electrode group 4 inside the battery case 2, the state where a part of battery case 2 was fractured | ruptured is shown. The battery case 2 and the lid 3 are made of a resin such as polypropylene, for example.

The lid 3 has a substantially rectangular shape when viewed from above. Hereinafter, for convenience of explanation, as shown in FIG. 1, the longitudinal direction of the lid 3 is defined as the X-axis direction, and the lateral direction of the lid 3 is defined as the Y-axis direction. In the present embodiment, as shown in FIG. 2, six cell chambers S1 to S6 arranged along the X-axis direction are formed inside the battery case 2. In each of the cell chambers S1 to S6, an electrode group 4 and an electrolytic solution are accommodated, respectively.

The lid 3 has a double lid structure including a lower lid portion (first lid portion) 10 and an upper lid portion (second lid portion) 20. The lower lid part 10 is attached to the upper part of the battery case 2 so as to close the opening of the battery case 2 of the lead storage battery 1. A concave exhaust chamber constituting portion 10 a (see FIG. 1) on which the upper lid portion 20 is disposed is formed on a part of the upper surface of the lower lid portion 10. The exhaust chamber constituting portion 10a extends along the X-axis direction when viewed from above. The exhaust chamber constituting portion 10 a is provided in a region of the upper surface of the lower lid portion 10 that is biased toward one side along the Y-axis direction.

The upper lid portion 20 is overlapped with the exhaust chamber constituting portion 10 a of the lower lid portion 10, and forms an exhaust chamber with the lower lid portion 10. In the present embodiment, six exhaust chambers D1 to D6 (see FIGS. 3 and 4) are formed between the lower lid portion 10 and the upper lid portion 20. In the present embodiment, in a state where the upper lid portion 20 is overlapped with the exhaust chamber constituting portion 10a of the lower lid portion 10, the height position of the upper surface of the lower lid portion 10 and the height position of the upper surface of the upper lid portion 20 are mutually different. It is almost the same. That is, the upper surface of the lower lid portion 10 and the upper surface of the upper lid portion 20 are substantially flush with each other.

The lower cover part 10 is provided with an indicator mounting hole H11 in a region of the upper surface of the lower cover part 10 where the exhaust chamber constituting part 10a is not provided. An indicator (not shown) that displays the liquid level height (liquid level) of the electrolytic solution in the battery case 2 is attached to the indicator mounting hole H11.

The lower lid portion 10 is provided with a positive electrode terminal T1 and a negative electrode terminal T2 in a region of the upper surface of the lower lid portion 10 where the exhaust chamber constituting portion 10a is not provided. The positive terminal T 1 is provided in the vicinity of one end of the lower lid portion 10 in the X-axis direction. The negative electrode terminal T 2 is provided in the vicinity of the other end portion in the X-axis direction of the lower lid portion 10. The electrode group 4 in the battery case 2 is connected to the positive terminal T1 and the negative terminal T2, respectively.

Next, details of the exhaust chambers D1 to D6 formed in the lid 3 will be described. As shown in FIG. 3, the lower lid portion 10 includes a plate-like main body portion 101 that covers the opening at the top of the battery case 2. Further, the lower lid portion 10 includes a peripheral wall portion (exhaust chamber wall) 110 that rises upward (upper lid portion 20 side) from the upper surface of the main body portion 101 at the position of the exhaust chamber constituting portion 10a of the main body portion 101, and the main body portion. Partition walls (exhaust chamber walls) 111 to 115 rising from the upper surface of 101 upward (upper lid 20 side) are provided. The peripheral wall portion 110 extends along the outer peripheral edge of the exhaust chamber constituting portion 10a. The peripheral wall 110 has a substantially rectangular frame shape.

More specifically, the peripheral wall portion 110 includes two X-axis

peripheral wall portions

110a and 110b extending substantially along the X-axis direction and two Y-axis peripheral wall portions 110c extending substantially along the Y-axis direction. And 110d. The X-axis peripheral wall portion 110b is located on the side where the positive electrode terminal T1 and the negative electrode terminal T2 are provided with respect to the X-axis peripheral wall portion 110a in the Y-axis direction. The Y-axis peripheral wall portion 110c is located in the vicinity of the negative electrode terminal T2. The Y-axis peripheral wall portion 110d is located in the vicinity of the positive electrode terminal T1. The peripheral wall 110 is configured by connecting the X-axis peripheral wall 110a, the Y-axis peripheral wall 110c, the X-axis peripheral wall 110b, and the Y-axis peripheral wall 110d in this order.

The partition walls 111 to 115 are respectively provided in the peripheral wall 110 and extend along the Y-axis direction. The partition walls 111 to 115 divide the space surrounded by the peripheral wall 110 into six. One end of the partition walls 111 to 115 is connected to the X-axis peripheral wall 110b. The other end of the partition walls 111 to 115 is connected to a flow path wall 50 of the flow path 5 described later. As will be described in detail later, the peripheral wall portion 110 and the partition wall portions 111 to 115 form exhaust chambers D1 to D6 between the upper lid portion 20 and the peripheral wall portion 110.

As shown in FIG. 4, the upper lid portion 20 has the same contour shape as that of the exhaust chamber constituting portion 10a. The upper lid portion 20 includes a plate-like main body portion 201 that is stacked on the upper surface of the exhaust chamber constituting portion 10a, a peripheral wall portion 210 that rises downward from the lower surface of the main body portion 201, and a partition wall that rises downward from the lower surface of the main body portion 201. Parts 211 to 215 are provided. The peripheral wall portion 210 extends along the outer peripheral edge of the main body portion 201. The partition portions 211 to 215 are provided in the peripheral wall portion 210, respectively, and extend along the Y-axis direction. The partition walls 211 to 215 partition the space surrounded by the peripheral wall 210 into six. As will be described in detail later, the peripheral wall portion 210 and the partition walls 211 to 215 form exhaust chambers D1 to D6 between the lower lid portion 10 and the peripheral wall portion 210.

The pattern of the peripheral wall portion 110 and the partition wall portions 111 to 115 provided in the exhaust chamber constituting portion 10a and the pattern of the peripheral wall portion 210 and the partition wall portions 211 to 215 provided in the upper lid portion 20 have a substantially mirror image relationship. Yes. The upper surface of the lower cover part 10 and the lower surface of the upper cover part 20 are joined by heat welding. Thus, exhaust chambers D1 to D6 are formed between the lower lid portion 10 and the upper lid portion 20. The exhaust chambers D1 to D6 store water vapor (mist) of the electrolyte generated from the cell chambers S1 to S6 in the battery case 2, and the electrolyte solution liquefied in the exhaust chambers D1 to D6 is stored in the cell chambers S1 to S6. It has a function of refluxing.

More specifically, the exhaust chambers D1 to D6 are located above the six cell chambers S1 to S6 provided in the battery case 2, respectively. The exhaust chambers D1 to D6 are each provided with a reflux hole H that passes through the main body 101 serving as a bottom plate of the exhaust chambers D1 to D6. That is, each of the reflux holes H penetrates from the exhaust chambers D1 to D6 toward the lower surface of the main body 101 (the surface on the side of the main body 101 that overlaps the battery case 2). The exhaust chambers D1 to D6 are connected to the cell chambers S1 to S6 of the battery case 2 through the reflux holes H provided in the exhaust chambers D1 to D6, respectively. A plurality of obstacle walls W are provided in the exhaust chambers D1 to D6. The obstacle wall W changes the traveling direction of the water vapor of the electrolytic solution so that the water vapor of the electrolytic solution that has entered from the reflux hole H advances in a meandering manner in each of the exhaust chambers D1 to D6. The obstacle wall W is provided on the lower lid portion 10 and the upper lid portion 20. The upper surface of the main body 101 serving as the bottom plate of the exhaust chambers D1 to D6 is inclined so as to gradually become lower toward the reflux hole H in each of the exhaust chambers D1 to D6.

As a result, the water vapor of the electrolyte discharged into the exhaust chambers D1 to D6 from the reflux holes H of the exhaust chambers D1 to D6 is liquefied by touching the obstacle walls W and the like, and then the bottom surfaces of the exhaust chambers D1 to D6. It returns to the return holes H of the exhaust chambers D1 to D6 through (the upper surface of the main body 101).

Further, the exhaust chambers D1 to D6 are respectively provided with electrolyte solution inlets C penetrating through the main body 101 serving as bottom plates of the exhaust chambers D1 to D6. In a state before the upper lid portion 20 is joined to the lower lid portion 10, an electrolytic solution is supplied into each cell chamber S1 to S6 of the battery case 2 via an electrolytic solution inlet C provided in each exhaust chamber D1 to D6. Is injected. An annular wall W 1 is provided on the upper surface of the main body portion 101 of the lower lid portion 10 so as to surround the edge portion of the electrolyte solution inlet C. The upper lid portion 20 is provided with an annular wall W1 at a position facing the annular wall W1 of the exhaust chamber constituting portion 10a.

The peripheral wall portion 110, the partition walls 111 to 115, the obstacle wall W, and the leading end portion of the annular wall W1 provided in the main body portion 101 of the lower lid portion 10 are located on substantially the same plane. Similarly, the peripheral wall part 210, the partition walls 211 to 215, the obstacle wall W, and the tip end part of the annular wall W1 provided in the main body part 201 of the upper lid part 20 are located on substantially the same plane. .

As shown in FIG. 4, an exhaust passage R for guiding the gas in the exhaust chambers D1 to D6 to the outside is provided on the lower surface of the upper lid portion 20 (the surface on the lower lid portion 10 side). In FIG. 4, the route of the exhaust passage R is indicated by a broken line. In the present embodiment, no wall portion is provided between the exhaust passage R and the exhaust chambers D1 to D6. The exhaust passage R communicates (crosses) the exhaust chambers D1 to D6, and exhausts the gases in the exhaust chambers D1 to D6 to the outside.

Exhaust holes H1 and H6 are provided at both ends in the X-axis direction of the upper lid part 20, respectively. The exhaust hole H6 connects the exhaust chamber D6 and the external space and exhausts the gas in the exhaust chambers D1 to D6 to the outside. The exhaust hole H6 extends along the X-axis direction. The opening at one end of the exhaust hole H6 faces the external space on the side surface of the upper lid 20 (see FIG. 1). The opening at the other end of the exhaust hole H6 faces the exhaust chamber D6. Hereinafter, the opening facing the exhaust chamber D6 in the exhaust hole H6 is referred to as an opening H6a. The opening H6a faces downward (lower lid 10 side).

Similarly, the exhaust hole H1 connects the exhaust chamber D1 and the external space and discharges the gas in the exhaust chambers D1 to D6 to the outside. The exhaust hole H1 extends along the X-axis direction. The opening at one end of the exhaust hole H1 faces the external space on the side surface of the upper lid portion 20. The opening at the other end of the exhaust hole H1 faces the exhaust chamber D1. Hereinafter, the opening facing the exhaust chamber D1 in the exhaust hole H1 is referred to as an opening H1a. The opening H1a faces downward (lower lid 10 side).

The gas that has flowed into the exhaust chambers D1 to D6 through the reflux holes H passes through the exhaust passage R and is discharged from the exhaust holes H1 or H6 to the outside of the lid 3. Depending on the installation location of the lead-acid battery 1, one of the exhaust holes H1 and H6 may be closed and only the other exhaust hole may be used.

The upper lid 20 further includes a catalyst A1 attached to the opening H1a of the exhaust hole H1 and a catalyst A6 attached to the opening H6a of the exhaust hole H6. The catalyst A1 generates liquid from gas by catalytic action. The catalyst A1 has a structure capable of circulating a gas. The catalyst A1 may be a porous member, for example. The catalyst A1 functions as a liquefaction unit that liquefies the gas that has entered the exhaust hole H1.

Here, in the lead storage battery 1, hydrogen gas and oxygen gas are generated by the electrolysis reaction of the electrolytic solution. Hydrogen gas and oxygen gas enter the exhaust chambers D1 to D6 through the reflux hole H. The catalyst A1 generates water by catalytic action using hydrogen gas and oxygen gas. For example, the catalyst A1 may be a catalyst containing polytetrafluoroethylene (PTFE). However, as the material of the catalyst A1, other materials may be used as long as water can be generated using hydrogen gas and oxygen gas.

Further, when the catalyst A1 is a porous member, the catalyst A1 obstructs the flow of gas passing through the exhaust hole H1. In this case, the catalyst A1 can change the water vapor in the electrolytic solution into a liquid by retaining the water vapor in the electrolytic solution in the catalyst A1 and cooling it. Thus, in addition to the catalytic action, the catalyst A1 may change the water vapor in the electrolytic solution into a liquid by inhibiting the flow of water vapor in the electrolytic solution.

Here, the catalyst A1 is attached to the opening H1a of the exhaust hole H1. For this reason, the liquid produced | generated by the catalyst A1 falls on the flow-path part 5 directly from the catalyst A1. In addition, when the catalyst A1 is attached to the middle part of the exhaust hole H1, the exhaust hole H1 is inclined so that the water generated by the catalyst A1 falls from the opening H1a onto the flow path part 5. Good. The catalyst A6 has the same configuration as the catalyst A1, and detailed description thereof is omitted.

Catalysts A1 and A6 may also function as an explosion-proof filter. Alternatively, in addition to the catalysts A1 and A6, explosion-proof filters may be separately provided in the exhaust holes H1 and H6.

Here, as shown in FIG. 3, the lid 3 further includes a flow path portion 5 provided between the lower lid portion 10 and the upper lid portion 20. The flow path section 5 extends along the X-axis direction in the exhaust chambers D1 to D6 over the exhaust chambers D1 to D6 (so as to cross the exhaust chambers D1 to D6). The flow path unit 5 circulates the liquid on the flow path unit 5 between the exhaust chambers D1 to D6. The flow path portion 5 is open on the upper side (upper lid portion 20 side). More specifically, the channel portion 5 is in a state of penetrating the partition walls 111 to 115 when viewed from above, and is provided from the opening H1a of the exhaust hole H1 to the opening H6a of the exhaust hole H6. ing.

That is, in the posture of the lid 3 when attached to the upper part of the battery case 2, the opening H1a of the exhaust hole H1 is located at the upper part of the flow path part 5, and when viewed along the vertical direction, the flow path part. It overlaps with 5. Similarly, in the posture of the lid 3 when attached to the upper part of the battery case 2, the opening H6a of the exhaust hole H6 is located at the upper part of the flow path part 5, and the flow path when viewed along the vertical direction. It overlaps with part 5.

In the present embodiment, the flow path part 5 includes the main body part 101 of the lower lid part 10, the flow path wall part 50, and the peripheral wall part 110 of the lower lid part 10. The flow path wall 50 rises upward (upper lid 20 side) from the upper surface of the main body 101. The flow path wall 50 extends along the X-axis direction so as to cross between the exhaust chambers D1 to D6. Both ends of the flow path wall 50 in the X-axis direction are in contact with the Y-axis

peripheral walls

110c and 110d of the peripheral wall 110, respectively.

A part of the main body 101 functions as the bottom of the flow path 5. A part of the peripheral wall 110 and the flow path wall 50 function as a flow path wall that forms a flow path for the flow path 5 to flow the liquid on the main body 101. That is, the peripheral wall portion 110 functions as an exhaust chamber wall that forms the exhaust chambers D1 to D6, and also functions as a flow channel wall for allowing the flow channel portion 5 to flow liquid on the main body portion 101.

More specifically, in the peripheral wall portion 110, the X-axis peripheral wall portion 110 a facing the flow channel wall portion 50 functions as a flow channel wall of the flow channel portion 5. In addition, a portion of the Y-axis peripheral wall 110 c of the peripheral wall 110 that connects the flow path wall 50 and the X-axis peripheral wall 110 a functions as a flow path wall of the flow path 5. Further, a portion connecting the flow path wall 50 and the X-axis peripheral wall 110 a in the Y-axis peripheral wall 110 d of the peripheral wall 110 functions as a flow path wall of the flow path 5. In the present embodiment, the flow path portion 5 is provided integrally with the lower lid portion 10.

As shown in FIG. 5, the height position of the tip portion in the rising direction of the flow path wall portion 50 is lower than the height position of the tip portion in the rising direction of the peripheral wall portion 110. For this reason, the liquid accumulated in the flow path section 5 gets over the flow path wall section 50 as the liquid increases, and flows into the exhaust chambers D1 to D6.

As described above, the lead storage battery 1 can change the gas that has entered the exhaust holes H1 and H6 from the exhaust chambers D1 to D6 into a liquid by the catalysts A1 and A6. The liquid changed by the catalysts A1 and A6 returns to the exhaust chambers D1 and D6 from the opening H1a of the exhaust hole H1 and the opening H6a of the exhaust hole H6, respectively. Here, in the posture of the lid 3 when attached to the upper part of the battery case 2, the opening part H1a of the exhaust hole H1 and the opening part H6a of the exhaust hole H6 are located at the upper part of the flow path part 5 and in the vertical direction. When viewed along, it overlaps the flow path portion 5. That is, the lead storage battery 1 can drop the liquid onto the flow path part 5 from the opening part H1a of the exhaust hole H1 and the opening part H6a of the exhaust hole H6. Here, the liquid falling on the flow path part 5 is the liquid generated by the catalyst A1 and A6 generated by the catalytic action and the liquid generated by retaining the water vapor of the electrolyte in the catalysts A1 and A6. Electrolytic solution.

And since the upper part of the flow-path part 5 is opening, when the quantity of the liquid on the flow-path part 5 increases and a liquid overflows from the upper part of the flow-path part 5 (beyond the flow-path wall part 50), a liquid Flows into the exhaust chambers D1 to D6. Here, the flow path portion 5 extends over the plurality of exhaust chambers D1 to D6. For this reason, the lead storage battery 1 is also provided in the exhaust chambers D2 to D5 other than the exhaust chamber D1 located immediately below the opening H1a of the exhaust hole H1 and the exhaust chamber D6 located immediately below the opening H6a of the exhaust hole H6. A liquid can flow through the flow path portion 5. The lead storage battery 1 can return the liquid flowing into the exhaust chambers D1 to D6 to the cell chambers S1 to S6 through the reflux holes H. Thus, this lead storage battery 1 can suppress the reduction | decrease of electrolyte solution by providing catalyst A1 and A6. In addition, since the lead storage battery 1 can flow the liquid into the exhaust chambers D1 to D6 through the flow path section 5, it is possible to suppress variations in the liquid level of the electrolyte in the cell chambers S1 to S6.

The flow path portion 5 for allowing the liquid to flow between the exhaust chambers D1 to D6 includes a main body portion 101 of the lower lid portion 10, a flow path wall portion 50, and a peripheral wall portion 110 of the lower lid portion 10. In this case, the lead storage battery 1 can cause a part of the main body 101 of the lower lid 10 to function as the bottom of the flow path 5. In the lead storage battery 1, a part of the peripheral wall part 110 of the lower lid part 10 and the flow path wall part 50 can function as a flow path wall of the flow path part 5. For example, the lower lid portion 10 and the flow path portion 5 can be molded integrally. In this case, the lead storage battery 1 can reduce the number of parts because the lower lid portion 10 also serves as the flow path portion 5.

Catalysts A1 and A6 generate water by catalytic action using hydrogen gas and oxygen gas. In this case, the lead storage battery 1 can change the gas into a liquid using the catalysts A1 and A6.

As mentioned above, although embodiment of this indication was described, this indication is not limited to the above-mentioned embodiment. For example, the flow path portion 5 in the above embodiment may be provided as a separate body from the lower lid portion 10 and the upper lid portion 20. Hereinafter, a modification in which the flow path unit 5 is provided separately from the lower lid unit 10 and the upper lid unit 20 will be described.

As shown in FIGS. 6 and 7, the flow path portion 5 A in the modification is provided between the lower lid portion 10 and the upper lid portion 20. The flow path portion 5A extends along the X-axis direction in the exhaust chambers D1 to D6 over the exhaust chambers D1 to D6 (so as to cross the exhaust chambers D1 to D6). The channel portion 5A includes a bottom portion 51 extending along the X-axis direction, and a channel wall portion 50A that rises upward from the outer peripheral edge of the bottom portion 51 (upper lid portion 20 side). That is, the flow path part 5A is open on the upper side (upper cover part 20 side). The flow path 5A is provided from the opening H1a of the exhaust hole H1 to the opening H6a of the exhaust hole H6 when viewed from above. The flow path part 5 A is held by the upper lid part 20. However, the flow path part 5 A may be held by the lower lid part 10.

Even in this case, the flow path portion 5A causes the liquid that has fallen onto the flow path portion 5A from the opening portion H1a of the exhaust hole H1 and the opening portion H6a of the exhaust hole H6 to flow between the exhaust chambers D1 to D6. Can do. Then, the flow path portion 5A causes the liquid to flow out from the upper portion of the flow path portion 5A when the amount of the liquid on the flow path portion 5A increases (passes the flow path wall portion 50A), thereby discharging the liquid to the exhaust chamber. D1 to D6 can be flowed. In this case, as shown in FIG. 8, the partition walls 111 to 115 of the lower lid part 10 are not cut out to provide the flow path part 5A, unlike the structure shown in FIG. That is, one end of the partition walls 111 to 115 is connected to the X-axis peripheral wall 110b. The other ends of the partition walls 111 to 115 are connected to the X-axis peripheral wall 110a. Thus, the lower lid portion 10 can reliably partition the portions on the lower lid portion 10 side of the exhaust chambers D1 to D6 by the partition walls 111 to 115.

Although the lid 3 of the above embodiment includes the catalysts A1 and A6 as liquefaction parts for liquefying gas, the liquefaction part may be a filter having no catalytic action. This filter may be configured to inhibit (obstruct) the flow of the water vapor of the electrolytic solution passing through the exhaust holes H1 and H6. This filter may be, for example, a porous member. Even in this case, the filter as the liquefaction part can change the water vapor of the electrolytic solution into a liquid by retaining the water vapor of the electrolytic solution in the filter and cooling it. In addition, the filter as a liquefaction part may serve as the function as an explosion-proof filter. Further, in addition to the filter as the liquefying section, an explosion-proof filter may be provided separately.

Although the flow path portion 5 of the above embodiment extends over the entire exhaust chambers D1 to D6, it may be constituted by a plurality of flow path portions. For example, the flow path part 5 may be configured by a first flow path part extending over the exhaust chambers D1 to D3 and a second flow path part extending over the exhaust chambers D4 to D6. Similarly, the channel portion 5A of the modification may be configured by a plurality of channel portions. That is, the flow path part should just be the structure extended over at least 2 exhaust chamber.

The flow path portion 5 of the embodiment may be inclined downward toward a predetermined exhaust chamber among the exhaust chambers D1 to D6. In this case, for example, the lead storage battery 1 can return a large amount of the electrolytic solution to the cell chamber in which the electrolytic solution tends to decrease compared to other cell chambers. Similarly, the channel portion 5A of the modification may be inclined downward toward a predetermined exhaust chamber.

The rising height of the flow path wall portion 50 of the flow path portion 5 of the embodiment may not be the same over the entire region. For example, in the flow path wall portion 50, the rising height of the portion of the exhaust chambers D1 to D6 that crosses the predetermined exhaust chamber may be lower than other portions. In this case, for example, the lead storage battery 1 can return a large amount of the electrolytic solution to the cell chamber in which the electrolytic solution tends to decrease compared to other cell chambers.

Further, the opening H1a of the exhaust hole H1 is not limited to facing downward (lower lid 10 side), and may be facing sideways. It suffices that at least the opening H1a overlaps the flow path part 5 when viewed along the vertical direction. Similarly, the opening H6a of the exhaust hole H6 is not limited to facing downward (lower lid 10 side).

The number of cell chambers included in the battery case 2 is not limited to six, and the number of exhaust chambers provided in the lid 3 is not limited to six. The shapes of the partition walls 111 to 115, the obstacle wall W, and the like are not limited to the shapes described with reference to FIGS.

Further, the flow path wall part 50 of the flow path part 5 is not limited to rising upward from the main body part 101 along the vertical direction. For example, the flow path wall portion 50 may rise from the main body portion 101 while being inclined with respect to the vertical direction. For example, the flow path wall 50 may rise in a state where the flow path wall 50 is inclined from the main body 101 so that the leading end (upper end) in the rising direction approaches the X-axis peripheral wall 110b side. Similarly, the flow path wall part 50A of the flow path part 5A in the modification may rise from the bottom 51 in a state inclined with respect to the vertical direction.

The exhaust holes H1 and H6 may be provided in the lower lid portion 10 instead of the upper lid portion 20. In this case, the opening on the exhaust chamber side of the exhaust hole provided in the lower lid portion 10 is located above the

flow path portions

5 and 5A, and when viewed along the vertical direction, the

flow path portions

5 and 5A. As long as it overlaps.

DESCRIPTION OF SYMBOLS 1 ... Lead storage battery, 2 ... Battery case, 3 ... Cover (lid of lead storage battery), 5 ... Flow path part, 10 ... Lower cover part (1st cover part), 20 ... Upper cover part (2nd cover part), 50 ... flow path wall (flow path wall), 101 ... main body, 110 ... peripheral wall (exhaust chamber wall, flow path wall), 111 to 115 ... partition wall (exhaust chamber wall), A1, A6 ... catalyst (liquefaction part) ), D1 to D6 ... exhaust chamber, H ... reflux hole, H1, H6 ... exhaust hole, H1a, H6a ... opening, S1-S6 ... cell chamber.

Claims

A lead-acid battery lid attached to the upper part of a battery case having a plurality of cell chambers,
A first lid attached to the top of the battery case;
A second lid that overlaps the first lid and forms a plurality of exhaust chambers with the first lid;
A flow path portion provided between the first lid portion and the second lid portion and extending over the plurality of exhaust chambers and for circulating a liquid;
With
The first lid portion is provided with a reflux hole penetrating from the exhaust chamber toward a surface of the first lid portion that is overlapped with the battery case, with respect to the plurality of exhaust chambers,
The first lid portion or the second lid portion has an exhaust hole attached with a liquefying portion that connects the exhaust chamber and an external space to discharge the gas in the exhaust chamber to the outside and liquefy the gas. Provided,
The flow path part is open on the second lid part side,
In the posture when being attached to the upper part of the battery case, the opening on the exhaust chamber side of the exhaust hole is located on the upper part of the flow path part, and when viewed along the vertical direction, the flow path part A lead-acid battery lid that overlaps with
The first lid portion is
A main body covering the top of the battery case;
An exhaust chamber wall that rises from the main body portion toward the second lid portion and forms the exhaust chamber with the second lid portion;
Have
The flow path part is
The body portion;
A flow path wall that rises from the main body part toward the second lid part side and forms a flow path for flowing the liquid on the main body part;
The lead-acid battery lid according to claim 1, comprising:
The lead-acid battery lid according to claim 1 or 2, wherein the liquefaction part is a catalyst that generates water by catalytic action using hydrogen gas and oxygen gas, or a filter that inhibits the flow of water vapor in the electrolyte.
A lead storage battery comprising the lid of the lead storage battery according to any one of claims 1 to 3.