Power storage battery cover and power storage battery

Abstract

To provide a power storage battery cover and a power storage battery that can reduce insufficient injection of electrolyte during the manufacture of a power storage battery.SOLUTION: A lead acid battery 1 includes a battery case 2 and a lid 3 attached to an upper portion of the battery case 2. The lid 3 includes a bottom wall portion 22 in which liquid filling ports 27A to 27F are formed, peripheral wall portions 28A to 28F erected on the bottom wall portion 22 so as to surround the liquid filling ports 27A to 27F, and protrusions 29A to 29F extending from the peripheral wall portions 28A to 28F toward the liquid filling ports 27A to 27F.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a battery lid and a battery. [Background technology]

[0002] Patent Document 1 describes a lead-acid battery (storage battery) for automobiles. The lid of this lead-acid battery (storage battery lid) includes an inner lid portion and an upper lid portion joined to the inner lid portion, and a plurality of exhaust chambers are formed in the space between the inner lid portion and the upper lid portion, each located above a plurality of cell chambers. In addition, the lid is formed with a plurality of liquid injection ports (liquid injection ports) penetrating the bottom wall portion of the exhaust chamber, and a plurality of cylindrical walls (circumferential wall portions) surrounding each liquid injection port. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-272264 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the manufacture of lead-acid batteries, electrolyte is injected into the cell chamber through the injection port in the inner lid before the upper lid is joined to the inner lid, but if electrolyte is injected into the cell chamber with too much force, the electrolyte injected into the cell chamber bounces back and is likely to splash out from the injection port. If the electrolyte splashes out from the injection port, the electrolyte will not flow back into the cell chamber, and it may not be possible to inject the specified amount of electrolyte into the cell chamber.

[0005] Therefore, an object of the present invention is to provide a battery lid and a storage battery that can reduce insufficient injection of electrolyte during the manufacture of the storage battery. [Means for solving the problem]

[0006] [1] The battery lid of the present invention comprises a bottom wall portion having a liquid filling port formed therein, a peripheral wall portion erected on the bottom wall portion so as to surround the liquid filling port, and a protrusion extending from the peripheral wall portion toward the liquid filling port.

[0007] In this battery lid, the protrusion extends from the peripheral wall toward the inlet, so that even if electrolyte is forcefully injected into the cell chamber from the inlet during battery manufacturing, the electrolyte that bounces back in the cell chamber hits the protrusion, making it difficult for the electrolyte to splash out of the inlet. This makes it possible to reduce insufficient electrolyte injection during battery manufacturing.

[0008] [2] In the battery lid described in [1], the protruding portion may have an inclined surface that is inclined toward the injection port in the opposite direction to the erection direction of the peripheral wall portion. In this battery lid, since the protruding portion has an inclined surface that is inclined toward the injection port in the opposite direction to the erection direction of the peripheral wall portion, even if the electrolyte spills out from the injection port, it is likely to flow back to the cell chamber along the inclined surface. This can further reduce insufficient injection of the electrolyte during the manufacture of the storage battery.

[0009] [3] The battery lid according to [1] or [2] may further include a partition wall extending from the bottom wall outside the peripheral wall. In this battery lid, the partition wall extends from the bottom wall outside the peripheral wall. Even if the electrolyte solution spilling out of the injection hole exceeds the peripheral wall, the electrolyte solution can be prevented from flowing into other cell chambers. This can further reduce insufficient electrolyte solution injection during battery manufacture and can prevent discrepancies in the amount of electrolyte solution injected between the cell chambers.

[0010] [4] In the battery lid described in [3], the peripheral wall may have a guide wall extending along the partition so as to face the partition. In this battery lid, since the peripheral wall has the guide wall extending along the partition so as to face the partition, it is possible to prevent the flow of the electrolyte from being stopped between the peripheral wall and the partition even if the gap between the peripheral wall and the partition is narrow.

[0011] [5] A storage battery according to the present invention includes a battery case and any of the battery lids described above attached to an upper portion of the battery case. Since the storage battery includes the battery lid described above, it is possible to reduce insufficient injection of electrolyte during manufacturing. Effect of the Invention

[0012] According to the present invention, it is possible to reduce insufficient injection of electrolyte during the manufacture of a storage battery. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a plan view of a lead-acid battery according to an embodiment. [Diagram 2] FIG. 2 is a side view of the lead-acid battery shown in FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] 6 is a cross-sectional view taken along line VI-VI shown in FIG. [Figure 7] 7 is a cross-sectional view taken along line VII-VII shown in FIG. [Figure 8] 8 is a cross-sectional view taken along line VIII-VIII shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the battery of the present invention will be described with reference to the drawings. In this embodiment, the storage battery of the present invention is applied to a lead-acid battery mounted in the trunk or interior space of a vehicle. In the description of the drawings, the same elements are given the same reference numerals, and duplicated explanations will be omitted.

[0015] Fig. 1 is a plan view of a lead-acid battery according to an embodiment. Fig. 2 is a side view of the lead-acid battery shown in Fig. 1. As shown in Figs. 1 and 2, a lead-acid battery 1 according to this embodiment includes a battery case 2, a lid 3 (battery lid), and a handle 4. The height direction of the lead-acid battery 1 is referred to as a height direction H. In addition, the up-down direction refers to the up-down direction in the height direction H.

[0016] Fig. 3 is a plan view of the battery case. As shown in Figs. 1 to 3, the battery case 2 has an open top and contains a plate group (not shown) and an electrolyte (not shown). The battery case 2 has a plurality of cell chambers 11A to 11F. The plate group and the electrolyte are contained in each of the cell chambers 11A to 11F. The cell chambers 11A to 11F are partitioned by partition walls 12 and arranged in a first direction D1. The first direction D1 is a direction perpendicular to the height direction H, and a direction perpendicular to the height direction H and the first direction D1 is called a second direction D2. Each of the cell chambers 11A to 11F extends in the second direction D2.

[0017] Fig. 4 is a plan view of the lower lid part. Fig. 5 is a plan view of the upper lid part. As shown in Figs. 1, 2, 4 and 5, the lid 3 has a double lid structure including a lower lid part 20 and an upper lid part 30. Exhaust chambers 40A-40F and an exhaust passage 41 are formed between the lower lid part 20 and the upper lid part 30 of the lid 3.

[0018] The lower cover portion 20 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-acid battery 1. A concave exhaust chamber component 21 on which the upper cover portion 30 is disposed is formed in a part of the upper surface of the lower cover portion 20. The exhaust chamber component 21 extends along the second direction D2 in a plan view. The exhaust chamber component 21 is provided in an area of ​​the upper surface of the lower cover portion 20 that is biased to one side along the first direction D1. The upper cover portion 30 is overlapped on the exhaust chamber component 21 of the lower cover portion 20, and forms exhaust chambers 40A to 40F and an exhaust passage 41 between the upper cover portion 30 and the lower cover portion 20. In this embodiment, when the upper cover portion 30 is overlapped on the exhaust chamber component 21 of the lower cover portion 20, the height position of the upper surface of the exhaust chamber component 21 of the lower cover portion 20 and the height position of the lower surface of the upper cover portion 30 are approximately the same as each other. That is, the upper surface of exhaust chamber forming portion 21 of lower lid portion 20 and the lower surface of upper lid portion 30 are substantially flush with each other. By joining the upper surface of exhaust chamber forming portion 21 of lower lid portion 20 and the lower surface of upper lid portion 30, exhaust chambers 40A to 40F and exhaust passages 41 are formed between exhaust chamber forming portion 21 of lower lid portion 20 and upper lid portion 30.

[0019] The exhaust chambers 40A to 40F are provided corresponding to the cell chambers 11A to 11F. That is, the exhaust chamber 40A is provided corresponding to the cell chamber 11A, the exhaust chamber 40B is provided corresponding to the cell chamber 11B, the exhaust chamber 40C is provided corresponding to the cell chamber 11C, the exhaust chamber 40D is provided corresponding to the cell chamber 11D, the exhaust chamber 40E is provided corresponding to the cell chamber 11E, and the exhaust chamber 40F is provided corresponding to the cell chamber 11F. Also, the exhaust chambers 40A to 40F are located above the corresponding cell chambers 11A to 11F. The exhaust chambers 40A to 40F are arranged in the first direction D1, similar to the cell chambers 11A to 11F. Each of the exhaust chambers 40A to 40F extends in the second direction D2. The exhaust passage 41 extends in the first direction D1 and is connected to the exhaust chambers 40A to 40F.

[0020] An indicator mounting hole 42 is provided in the bottom cover portion 20 in an area of ​​the upper surface of the bottom cover portion 20 where the exhaust chamber component 21 is not provided. An indicator 43 that displays the liquid level of the electrolyte in the battery container 2 is attached to the indicator mounting hole 42.

[0021] A positive electrode terminal 44 and a negative electrode terminal 45 are provided on the bottom lid portion 20 in an area of ​​the upper surface of the bottom lid portion 20 where the exhaust chamber component 21 is not provided. The positive electrode terminal 44 is provided near one end of the bottom lid portion 20 in the first direction D1. The negative electrode terminal 45 is provided near the other end of the bottom lid portion 20 in the first direction D1. The electrodes in the battery case 2 are electrically connected to the positive electrode terminal 44 and the negative electrode terminal 45, respectively.

[0022] Fig. 6 is a cross-sectional view taken along line VII-VII shown in Fig. 4. Fig. 7 is a cross-sectional view taken along line VII-VII shown in Fig. 4. Fig. 8 is a cross-sectional view taken along line VIII-VIII shown in Fig. 4. As shown in Figs. 4 and 6 to 8, the lower cover 20 has a plate-shaped bottom wall 22 that covers the opening at the top of the battery case 2. In addition, the lower lid portion 20 is provided with an outer peripheral wall portion 23 that stands upward (towards the upper lid portion 30) from the upper surface of the bottom wall portion 22 at the position of the exhaust chamber constituent portion 21 of the bottom wall portion 22, partition wall portions 24A to 24E that stand upward (towards the upper lid portion 30) from the upper surface of the bottom wall portion 22, reflux holes 25A to 25F that penetrate the bottom wall portion 22, obstacle walls 26A to 26F that stand upward (towards the upper lid portion 30) from the upper surface of the bottom wall portion 22, liquid injection ports 27A to 27F that penetrate the bottom wall portion 22, peripheral wall portions 28A to 28F that stand upward (towards the upper lid portion 30) from the upper surface of the bottom wall portion 22 to surround the liquid injection ports 27A to 27F, and protrusions 29A to 29F.

[0023] The outer peripheral wall portion 23 extends along the outer periphery of the exhaust chamber component 21. The outer peripheral wall portion 23 is formed in a substantially rectangular frame shape. The outer peripheral wall portion 23 is composed of two first outer peripheral wall portions 23a, 23b extending along the first direction D1 and two second outer peripheral wall portions 23c, 23d extending along the second direction D2. The first outer peripheral wall portion 23a is formed such that the center portion in the first direction D1 is bent in the second direction D2. The first outer peripheral wall portion 23b is located on the side where the positive electrode terminal 44 and the negative electrode terminal 45 are provided, relative to the first outer peripheral wall portion 23a, in the second direction D2. The second outer peripheral wall portion 23c is provided near one end of the first direction D1. The second outer peripheral wall portion 23d is provided near the other end of the first direction D1. The outer peripheral wall portion 23 is formed by connecting a first outer peripheral wall portion 23a, a second outer peripheral wall portion 23c, a first outer peripheral wall portion 23b, and a second outer peripheral wall portion 23d in this order.

[0024] The partition walls 24A to 24E are walls for forming exhaust chambers 40A to 40F between themselves and the upper cover 30. The partition walls 24A to 24E are provided inside the outer peripheral wall 23 and outside the peripheral wall 28A to 28F, and extend along the second direction D2. The partition walls 24A to 24E divide the space surrounded by the outer peripheral wall 23 into six sections. One end of each of the partition walls 24A to 24E is connected to the first outer peripheral wall 23b. The other end of each of the partition walls 24A to 24E is connected to the first outer peripheral wall 23a. The partition walls 24A to 24E form the boundaries of the exhaust chambers 40A to 40F.

[0025] The return holes 25A-25F are holes for discharging gas generated in the cell chambers 11A-11F to the exhaust chambers 40A-40F and returning the electrolyte liquefied in the exhaust chambers 40A-40F to the cell chambers 11A-11F. The return holes 25A-25F communicate between the cell chambers 11A-11F and the exhaust chambers 40A-40F. In other words, return hole 25A connects cell chamber 11A and exhaust chamber 40A, return hole 25B connects cell chamber 11B and exhaust chamber 40B, return hole 25C connects cell chamber 11C and exhaust chamber 40C, return hole 25D connects cell chamber 11D and exhaust chamber 40D, return hole 25E connects cell chamber 11E and exhaust chamber 40E, and return hole 25F connects cell chamber 11F and exhaust chamber 40F.

[0026] The obstacle walls 26A to 26F are walls for liquefying the water vapor of the electrolyte in the exhaust chambers 40A to 40F. The obstacle walls 26A to 26F are provided in the exhaust chambers 40A to 40F, and are structured to cause the water vapor of the electrolyte to progress in a serpentine manner in each of the exhaust chambers 40A to 40F. The obstacle wall 26A is provided in the exhaust chamber 40A, the obstacle wall 26B is provided in the exhaust chamber 40B, the obstacle wall 26C is provided in the exhaust chamber 40C, the obstacle wall 26D is provided in the exhaust chamber 40D, the obstacle wall 26E is provided in the exhaust chamber 40E, and the obstacle wall 26F is provided in the exhaust chamber 40F.

[0027] The upper surface of the bottom wall portion 22, which serves as the bottom plate of the exhaust chambers 40A-40F, is inclined so as to gradually lower toward the reflux holes 25A-25F within the exhaust chambers 40A-40F. As a result, the water vapor of the electrolyte discharged from the reflux holes 25A-25F of the exhaust chambers 40A-40F to the exhaust chambers 40A-40F comes into contact with the obstacle walls 26A-26F, etc., and is liquefied, and then flows along the bottom surface of the exhaust chambers 40A-40F (the upper surface of the bottom wall portion 22) and returns to the reflux holes 25A-25F of the exhaust chambers 40A-40F.

[0028] The liquid filling ports 27A to 27F are openings for injecting the electrolyte into the cell chambers 11A to 11F. The liquid filling ports 27A to 27F are located in the exhaust chambers 40A to 40F and communicate with the cell chambers 11A to 11F. That is, the liquid filling port 27A is located in the exhaust chamber 40A and communicates with the cell chamber 11A, the liquid filling port 27B is located in the exhaust chamber 40B and communicates with the cell chamber 11B, the liquid filling port 27C is located in the exhaust chamber 40C and communicates with the cell chamber 11C, the liquid filling port 27D is located in the exhaust chamber 40D and communicates with the cell chamber 11D, the liquid filling port 27E is located in the exhaust chamber 40E and communicates with the cell chamber 11E, and the liquid filling port 27F is located in the exhaust chamber 40F and communicates with the cell chamber 11F.

[0029] The peripheral wall portions 28A to 28F are walls for isolating the liquid injection ports 27A to 27F from the exhaust chambers 40A to 40F. The peripheral wall portions 28A to 28F are separated from one another by the partition walls 24A to 24E and are located in the exhaust chambers 40A to 40F. That is, the peripheral wall portion 28A is located in the exhaust chamber 40A, the peripheral wall portion 28B is located in the exhaust chamber 40B, the peripheral wall portion 28C is located in the exhaust chamber 40C, the peripheral wall portion 28D is located in the exhaust chamber 40D, the peripheral wall portion 28E is located in the exhaust chamber 40E, and the peripheral wall portion 28F is located in the exhaust chamber 40F.

[0030] The peripheral wall portion 28A is spaced apart from the partition wall portion 24A and the second outer peripheral wall portion 23c. The peripheral wall portion 28B is integrated with the partition wall portion 24A and spaced apart from the partition wall portion 24B. The peripheral wall portion 28C is spaced apart from the partition wall portion 24B and integrated with the partition wall portion 24C. The peripheral wall portion 28D is integrated with the partition wall portion 24C and spaced apart from the partition wall portion 24D. The peripheral wall portion 28E is spaced apart from the partition wall portion 24D and integrated with the partition wall portion 24E. The peripheral wall portion 28F is spaced apart from the partition wall portion 24E and the second outer peripheral wall portion 23d.

[0031] The peripheral wall portions 28A to 28F are formed in a tubular shape surrounding the liquid pouring ports 27A to 27F. The tubular shape of the peripheral wall portions 28A to 28F is not particularly limited, and may be a cylindrical shape, a square tubular shape, etc. In this embodiment, the peripheral wall portions 28A to 28F are formed in a square tubular shape with rounded corners.

[0032] The peripheral walls 28A to 28F have guide walls 281A to 281F extending along the partitions 24A to 24E so as to face the partitions 24A to 24E. The guide wall 281A extends along the partitions 24A at a position spaced apart from the partitions 24A so as to face the partitions 24A. Therefore, a flow path extending in the second direction D2 in the exhaust chamber 40A is formed between the guide wall 281A and the partitions 24A. The guide wall 281B extends along the partitions 24B at a position spaced apart from the partitions 24B so as to face the partitions 24B. Therefore, a flow path extending in the second direction D2 in the exhaust chamber 40B is formed between the guide wall 281B and the partitions 24B. The guide wall portion 281C extends along the partition wall portion 24B so as to face the partition wall portion 24B at a position separated from the partition wall portion 24B. Therefore, a flow path in the exhaust chamber 40C extending in the second direction D2 is formed between the guide wall portion 281C and the partition wall portion 24B. The guide wall portion 281D extends along the partition wall portion 24D so as to face the partition wall portion 24D at a position separated from the partition wall portion 24D. Therefore, a flow path in the exhaust chamber 40D extending in the second direction D2 is formed between the guide wall portion 281D and the partition wall portion 24D. The guide wall portion 281E extends along the partition wall portion 24D so as to face the partition wall portion 24D at a position separated from the partition wall portion 24D. Therefore, a flow path in the exhaust chamber 40E extending in the second direction D2 is formed between the guide wall portion 281E and the partition wall portion 24D. The guide wall portion 281F extends along the partition wall portion 24E at a position spaced apart from the partition wall portion 24E so as to face the partition wall portion 24E. Therefore, a flow path in the exhaust chamber 40F extending in the second direction D2 is formed between the guide wall portion 281F and the partition wall portion 24E.

[0033] The peripheral wall portion 28A has a guide wall portion 282A extending along the second outer peripheral wall portion 23c so as to face the second outer peripheral wall portion 23c at a position separated from the second outer peripheral wall portion 23c, and the peripheral wall portion 28F has a guide wall portion 282F extending along the second outer peripheral wall portion 23d so as to face the second outer peripheral wall portion 23d at a position separated from the second outer peripheral wall portion 23d. Therefore, a flow path in the exhaust chamber 40A extending in the second direction D2 is formed between the guide wall portion 282A and the second outer peripheral wall portion 23c. Also, a flow path in the exhaust chamber 40F extending in the second direction D2 is formed between the guide wall portion 282F and the second outer peripheral wall portion 23d.

[0034] The protrusions 29A-29F are portions for preventing the electrolyte that has rebounded from the cell chambers 11A-11F from splashing out of the liquid filling ports 27A-27F. The protrusions 29A-29F extend from the peripheral walls 28A-28F to the liquid filling ports 27A-27F in a direction intersecting the erection direction (height direction H) of the peripheral walls 28A-28F.

[0035] Protruding portion 29A extends from peripheral wall portion 28A to liquid pouring port 27A in a direction intersecting the erect direction of peripheral wall portion 28A. Protruding portion 29A has an inclined surface 291A that inclines toward liquid pouring port 27A in the opposite direction to the erect direction of peripheral wall portion 28A. Inclined surface 291A is the surface of protruding portion 29A opposite to battery case 2, and is inclined so that the electrolyte on protruding portion 29A falls from liquid pouring port 27A into cell chamber 11A by gravity.

[0036] Protruding portion 29B extends from peripheral wall portion 28B to liquid pouring port 27B in a direction intersecting the erection direction of peripheral wall portion 28B. Protruding portion 29B has an inclined surface 291B that inclines toward liquid pouring port 27B in the opposite direction to the erection direction of peripheral wall portion 28B. Inclined surface 291B is the surface of protruding portion 29B opposite to battery case 2, and is inclined so that the electrolyte on protruding portion 29B falls from liquid pouring port 27B into cell chamber 11B by gravity.

[0037] The protruding portion 29C extends from the peripheral wall portion 28C to the liquid pouring port 27C in a direction intersecting the erect direction of the peripheral wall portion 28C. The protruding portion 29C has an inclined surface 291C that is inclined toward the liquid pouring port 27C in the opposite direction to the erect direction of the peripheral wall portion 28C. The inclined surface 291C is the surface of the protruding portion 29C on the opposite side to the battery case 2, and is inclined so that the electrolyte on the protruding portion 29C falls from the liquid pouring port 27C into the cell chamber 11C by gravity.

[0038] Protrusion 29D extends from peripheral wall 28D to pouring port 27D in a direction intersecting the erection direction of peripheral wall 28D. Protrusion 29D has an inclined surface 291D that is inclined toward pouring port 27D in the opposite direction to the erection direction of peripheral wall 28D. Inclined surface 291D is the surface of protrusion 29D opposite to battery case 2, and is inclined so that the electrolyte on protrusion 29D falls from pouring port 27D into cell chamber 11D by gravity.

[0039] The protruding portion 29E extends from the peripheral wall portion 28E to the liquid filling port 27E in a direction intersecting the erected direction of the peripheral wall portion 28E. The protruding portion 29E has an inclined surface 291E that inclines toward the liquid filling port 27E in the opposite direction to the erected direction of the peripheral wall portion 28E. The inclined surface 291E is the surface of the protruding portion 29E opposite the battery case 2, and is inclined so that the electrolyte on the protruding portion 29E falls from the liquid filling port 27E into the cell chamber 11E by gravity. The protruding portion 29F extends from the peripheral wall portion 28F to the liquid filling port 27F in a direction intersecting the erect direction of the peripheral wall portion 28F. The protruding portion 29F has an inclined surface 291F that inclines toward the liquid filling port 27F in the opposite direction to the erect direction of the peripheral wall portion 28F. The inclined surface 291F is the surface of the protruding portion 29F opposite the battery case 2, and is inclined so that the electrolyte on the protruding portion 29F falls from the liquid filling port 27F into the cell chamber 11F by gravity.

[0040] 5, the upper lid portion 30 has a contour shape similar to that of the exhaust chamber forming portion 21. The upper lid portion 30 includes a plate-shaped top wall portion 32 that is overlaid on the upper surface of the exhaust chamber forming portion 21. The upper lid portion 30 also includes an outer peripheral wall portion 33 that stands downward from the lower surface of the top wall portion 32, partition wall portions 34A to 34E that stand downward from the lower surface of the top wall portion 32, barrier walls 36A to 36F that stand downward from the lower surface of the top wall portion 32, liquid tap ports 37A to 37F that penetrate the top wall portion 32, peripheral wall portions 38A to 38F that stand downward from the lower surface of the top wall portion 32 so as to surround the liquid tap ports 37A to 37F, and exhaust ports 39A, 39B.

[0041] The pattern of the outer peripheral wall portion 23, partition walls 24A-24E, obstacle walls 26A-26F, liquid inlet ports 27A-27F, and peripheral wall portions 28A-28F provided in the exhaust chamber forming portion 21 of the bottom lid portion 20 and the pattern of the outer peripheral wall portion 33, partition walls 34A-34E, obstacle walls 36A-36F, liquid plug ports 37A-37F, and peripheral wall portions 38A-38F provided in the top lid portion 30 have a substantially mirror image relationship. The upper surface of the exhaust chamber forming portion 21 of the bottom lid portion 20 and the lower surface of the top lid portion 30 are joined by thermal welding. Specifically, the upper surfaces of the outer peripheral wall portion 23, the partition walls 24A-24E, the obstacle walls 26A-26F, and the peripheral wall portions 28A-28F are joined by thermal welding to the lower surfaces of the outer peripheral wall portion 33, the partition walls 34A-34E, the obstacle walls 36A-36F, and the peripheral wall portions 38A-38F. As a result, exhaust chambers 40A-40F and exhaust passages 41 are formed between the lower lid portion 20 and the upper lid portion 30.

[0042] The outer peripheral wall portion 33 extends along the outer peripheral edge of the top wall portion 32. The outer peripheral wall portion 33 is formed in a substantially rectangular frame shape. The outer peripheral wall portion 33 is composed of first outer peripheral wall portions 33a, 33b facing the first outer peripheral wall portions 23a, 23b of the lower cover portion 20 in the height direction H, and second outer peripheral wall portions 33c, 33d facing the second outer peripheral wall portions 23c, 23d of the lower cover portion 20 in the height direction H.

[0043] The partition walls 34A to 34E are walls for forming exhaust chambers 40A to 40F and exhaust passages 41 between the lower lid portion 20 and the partition walls 34A to 34E. The partition walls 34A to 34E are provided inside the outer peripheral wall portion 33 and outside the peripheral wall portions 38A to 38F, and extend along the second direction D2. The partition walls 34A to 34E divide the space surrounded by the outer peripheral wall portion 33 into six portions. One end of each of the partition walls 34A to 34E is connected to the first outer peripheral wall portion 33b. The other end of each of the partition walls 34A to 34E is spaced apart from the first outer peripheral wall portion 23a. The outer peripheral wall portion 33 and the partition walls 34A to 34E are joined to the outer peripheral wall portion 23 and the partition walls 24A to 24E of the lower lid portion 20 to form the exhaust chambers 40A to 40F and exhaust passages 41 between the upper lid portion 30 and the partition walls 34A to 34E. The exhaust passage 41 is defined by the area between the partition walls 34A to 34E and the first outer peripheral wall portion 23a.

[0044] The obstacle walls 36A to 36F are walls for liquefying water vapor of the electrolyte in the exhaust chambers 40A to 40F. The obstacle walls 36A to 36F are joined to the obstacle walls 26A to 26F of the lower lid portion 20 to form a meandering path in the exhaust chambers 40A to 40F.

[0045] Liquid plugs 35A to 35F for opening and closing liquid plug ports 37A to 37F are removably fitted into liquid plug ports 37A to 37F. Liquid plugs 35A to 35F are removably fitted into liquid plug ports 37A to 37F by, for example, a screw mechanism.

[0046] The peripheral wall portions 38A to 38F are walls for isolating the liquid tap ports 37A to 37F and the exhaust chambers 40A to 40F. The peripheral wall portions 38A to 38F are separated from each other by the partition walls 34A to 34E and are located in the exhaust chambers 40A to 40F. The peripheral wall portions 38A to 38F are formed in a cylindrical shape similar to the peripheral wall portions 28A to 28F of the lower cover portion 20. The peripheral wall portions 38A to 38F have guide wall portions 381A to 381F that face the guide wall portions 281A to 281F of the lower cover portion 20 in the height direction H. The peripheral wall portions 38A, 38F also have guide wall portions 382A, 382F that face the guide wall portions 282A, 282F of the lower cover portion 20 in the height direction H.

[0047] The exhaust ports 39A, 39B are holes for discharging gas generated in the cell chambers 11A-11F to the outside of the lead-acid battery 1 through the exhaust chambers 40A-40F and the exhaust passage 41. The exhaust port 39A is connected to the exhaust chamber 40A located at one end in the first direction D1, and opens to one end face in the first direction D1 of the top cover portion 30. The exhaust port 39B is connected to the exhaust chamber 40F located at the other end in the first direction D1, and opens to the other end face in the first direction D1 of the top cover portion 30.

[0048] The handle 4 is attached to the lid 3 in order to carry the lead-acid battery 1. The handle 4 is formed, for example, in a belt-like shape (band-like shape). The handle 4 is detachably attached to the lid 3 so as to be located, for example, in the center in the first direction D1 and extend in the second direction D2 in a plan view.

[0049] Next, a method for manufacturing the lead-acid battery 1 will be described.

[0050] First, electrode plate groups are accommodated in the cell chambers 11A-11F of the battery case 2. Next, the bottom lid portion 20 is joined to the battery case 2 to close the opening of the battery case 2. Next, electrolyte is poured into the cell chambers 11A-11F from the liquid filling ports 27A-27F of the bottom lid portion 20. Next, the top lid portion 30 is joined to the exhaust chamber forming portion 21 of the bottom lid portion 20 to form the exhaust chambers 40A-40F and the exhaust passage 41. Next, the handle 4 is attached to the lid 3.

[0051] In this way, in the lid 3 of the lead-acid battery 1 according to this embodiment, the protrusions 29A-29F extend from the peripheral wall portions 28A-28F toward the filling ports 27A-27F, so that even if the electrolyte is forcefully injected into the cell chambers 11A-11F from the filling ports 27A-27F during the manufacture of the lead-acid battery 1, the electrolyte that bounces back in the cell chambers 11A-11F hits the protrusions, making it difficult for the electrolyte to splash out of the filling ports 27A-27F. This makes it possible to reduce insufficient injection of the electrolyte during the manufacture of the lead-acid battery 1.

[0052] Furthermore, in this lid 3, the protruding portions 29A-29F have inclined surfaces 291A-291F that are inclined toward the liquid filling ports 27A-27F in the opposite direction to the erection direction of the peripheral wall portions 28A-28F, so that even if the electrolyte spills out from the liquid filling ports 27A-27F, it is likely to flow back to the cell chambers 11A-11F along the inclined surfaces 291A-291F. This can further reduce insufficient injection of electrolyte during the manufacture of the lead-acid battery 1.

[0053] Furthermore, in this lid 3, the partitions 24A-24E are erected from the bottom wall 22 outside the peripheral walls 28A-28F, so that even if the electrolyte spills out of the electrolyte filling holes 27A-27F and exceeds the peripheral walls 28A-28F, the electrolyte can be prevented from flowing into the other cell chambers 11A-11F. This can further reduce insufficient electrolyte injection during manufacture of the lead-acid battery 1, and can also prevent discrepancies in the amounts of electrolyte injected between the cell chambers 11A-11F.

[0054] Furthermore, in this lid 3, the peripheral wall portions 28A-28F have guide wall portions 281A-281F extending along the partition portions 24A-24E so as to face the partition portions 24A-24E, so that even if the gap between the peripheral wall portions 28A-28F and the partition portions 24A-24E is narrow, it is possible to prevent the flow of the electrolyte from being stopped between the peripheral wall portions 28A-28F and the partition portions 24A-24E.

[0055] In the lead-acid battery 1 according to this embodiment, since the above-mentioned lid 3 is provided, it is possible to reduce insufficient injection of the electrolyte during manufacture.

[0056] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. [Explanation of symbols]

[0057] 1... Lead-acid battery, 2... Battery case, 3... Cover, 4... Handle, 11A~11F... Cell compartments, 12... Partition wall, 20... Lower cover part, 21... Exhaust chamber forming part, 22... Bottom wall part, 23... Outer peripheral wall part, 23a, 23b... First outer peripheral wall part, 23c, 23d... Second outer peripheral wall part, 24A~24E... Partition wall parts, 25A~25F... Reflux holes, 26A~26F... Obstacle walls, 27A~27F... Liquid injection ports, 28A~28F... Peripheral wall parts, 281A~281F... Guide inner wall parts, 282A, 282F... Guide inner wall parts, 29A~29F... Protrusions, 291A~291F... Inclined surfaces, 30... Upper cover part, 32... Top wall part, 33... Outer peripheral wall part, 33a, 33b... First outer peripheral wall part, 33c, 33d... Second outer peripheral wall part, 34A~34E... Partition wall parts, 35A~35F... Liquid plugs, 36A~36F... Obstacle walls, 37A~37F... Liquid plug ports, 38A~38F... Peripheral wall parts, 381A~381F... Guide inner wall parts, 382A, 382F... Guide inner wall parts, 39A, 39B... Exhaust ports, 40A~40F... Exhaust chambers, 41... Exhaust passage, 42... Indicator mounting hole, 43... Indicator, 44... Positive electrode terminal, 45... Negative electrode terminal, D1... First direction, D2... Second direction, H... Height direction.

Claims

1. A bottom wall portion having a liquid inlet formed therein; a peripheral wall portion erected on the bottom wall portion so as to surround the liquid inlet; A protrusion extending from the peripheral wall portion toward the liquid inlet. Battery cover.

2. The protrusion has an inclined surface that is inclined toward the liquid pouring port in a direction opposite to the vertical direction of the peripheral wall portion. The battery lid according to claim 1.

3. The housing further includes a partition wall portion extending from the bottom wall portion on the outer side of the peripheral wall portion. The battery lid according to claim 1.

4. The peripheral wall portion has a guide wall portion extending along the partition wall portion so as to face the partition wall portion. The battery lid according to claim 3.

5. A battery case and The battery lid according to any one of claims 1 to 4 is attached to an upper portion of the battery case. Storage battery.

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