JP6948996B2 - Lead-acid battery - Google Patents

Description

The present invention relates to a lead storage battery.

As a conventional example of a lead-acid battery, there is a structure in which the upper surface (opening surface) of a synthetic resin battery case is sealed with a synthetic resin lid. In the lead-acid battery having this structure, the battery case made of synthetic resin has a plurality of cell chambers partitioned by partition walls. In addition, a plurality of electrode plate groups are stored in a plurality of cell chambers one by one. Then, a group of electrode plates adjacent to each other via the partition wall are connected via a through hole provided in the partition wall. This connection is usually made by performing resistance welding by sandwiching the through hole of the partition wall and its peripheral portion between the intermediate pole columns rising from the positive and negative straps of the electrode plate group.

The synthetic resin lid has a plurality of dividers corresponding to the plurality of partition walls of the battery case. The plurality of partition plates are fixed to the plurality of partition walls of the electric tank by welding after the electrode plates are housed in each cell chamber of the electric tank and the above resistance welding is performed. At the time of this welding, it is necessary to position each partition wall of the battery case and each partition plate of the lid. Patent Documents 1 and 2 have a description regarding this positioning.

In the lead-acid battery of Patent Document 1, ribs are fixed on both sides of the partition plate (closure partition wall) of the lid in the thickness direction. The lid also has guides that are continuously arranged on the ribs on both sides of the partition wall of the battery case in the thickness direction. This guide has an inclined surface (guide surface) facing the partition wall of the battery case. The upper end surface of the partition wall of the battery case is guided by this inclined surface and smoothly abuts on the lower end surface of the partition plate of the lid. However, Patent Document 1 does not describe the angle of the inclined surface of the guide with respect to the partition wall of the battery case and the dimensions of the guide.

Also in the lead-acid battery of Patent Document 2, as a guide for positioning, a guide member having an inclined surface facing the partition wall of the battery case is provided on the partition plate of the lid. Three guide members are arranged in a direction perpendicular to the arrangement direction of the cell chamber. Further, the lid has a pair of facing walls corresponding to one liquid injection hole for each liquid injection hole, and one of the facing walls and a guide member are connected to each other. However, Patent Document 2 also does not describe the angle of the inclined surface of the guide with respect to the partition wall of the battery case and the dimensions of the guide.

Japanese Unexamined Patent Publication No. 2003-142041 JP-A-2017-59419

When mounting a lead-acid battery in a vehicle, in order to prevent the lead-acid battery from vibrating while driving, a fixing bracket called a stay is placed on the lid and the bolts at both ends in the length direction are tightened. , Holds down the lead-acid battery. This tightening must be performed with an appropriate force, and if the tightening force is too strong, the exterior 102a and the partition wall 102b of the battery case 102 may be deformed in an arch shape as shown in FIG. Then, as shown in FIG. 12, when a gap S is generated between the intermediate pole column 300 and the partition wall 102b due to the bow-shaped deformation of the partition wall 102b, a liquid leak occurs from that portion. When a liquid leak occurs, the internal resistance of the battery rises, and in the case of an idling stop vehicle, idling stop is prohibited.

An object of the present invention is to provide a lead-acid battery having a structure in which the upper surface of a synthetic resin battery is sealed with a synthetic resin lid, even if the tightening force of the stay when mounting the battery on a vehicle is too strong. It is to provide a partition wall that is not easily deformed into an arch shape.

In order to solve the above problems, the lead storage battery of the first aspect of the present invention has the following configurations (1) to (5).
(1) A synthetic resin electric tank having a plurality of cell chambers partitioned by a partition wall, a plurality of electrode plates housed in the plurality of cell chambers, and a synthetic resin that seals the upper surface of the electric tank. It is equipped with a plastic lid.
(2) The lid is attached to a partition plate fixed to the partition wall by welding to form an upper space above each of the plurality of cell chambers, ribs fixed to both sides of the partition plate in the thickness direction, and the ribs. The guides (positioning guides at the time of welding) that are continuously arranged on both sides in the thickness direction of the partition wall are integrally provided.
(3) The electrode plate group includes a positive electrode strap and a negative electrode strap that connect a plurality of positive electrode plates and negative electrode plates at different positions in the width direction, and a positive electrode intermediate pole column that rises from the positive electrode strap and the negative electrode strap, respectively. It has a negative electrode intermediate pole column. The positive electrode intermediate pole column arranged in one of the two adjacent cell chambers and the negative electrode intermediate pole column arranged in the other are connected by a metal portion in the through hole formed in the partition wall.
(4) A distance A along the height direction from the boundary between the partition wall and the partition plate to the tip of the guide, and along the height direction from the boundary to the positive electrode intermediate pole pillar and the negative electrode intermediate pole pillar. The ratio (A / B) to the distance B is 0.15 or more and 0.40 or less.
(5) The tip of the guide has an inclined surface facing the partition wall, and the angle of the inclined surface with respect to the partition wall is 20 ° or more and 40 ° or less.

The lead-acid battery of the second aspect of the present invention has the above configurations (1) to (4) and the following configurations (6).
(6) As the ribs fixed on both sides in the thickness direction of the partition plate, the ribs are arranged above the positive electrode intermediate pole column and the negative electrode intermediate pole column, respectively. That is, in at least two adjacent cell chambers, the ribs are arranged above the positive electrode intermediate pole pillar and the negative electrode intermediate pole pillar that are adjacent to each other with the partition wall interposed therebetween, but are arranged in other portions. It may have the rib.

The lead-acid batteries of the first aspect and the second aspect of the present invention are lead-acid batteries having a structure in which the upper surface of a synthetic resin battery case is sealed with a synthetic resin lid, and depend on a stay when mounted on a vehicle. Even if the tightening force is too strong, the partition wall of the battery case is unlikely to be deformed into an arch shape. As a result, the occurrence of liquid leakage due to the arched deformation of the partition wall can be suppressed.

It is a figure explaining the lead-acid battery of an embodiment, and shows the state which the cover was removed from the electric tank. It is a partial cross-sectional view of the lead storage battery of an embodiment. It is a top view which shows the surface of the lid which comprises the lead-acid battery of an embodiment toward an electric tank. It is a top view explaining the positional relationship between the rib of a lid and the strap of a group of electrode plates in the lead storage battery of an embodiment. It is a top view which shows the mounting state of the lead-acid battery of embodiment to a vehicle body. FIG. 5 is a plan view illustrating an example different from FIG. 4 in the positional relationship between the rib of the lid and the strap of the electrode plate group. FIG. 5 is a plan view illustrating an example different from FIG. 4 in the positional relationship between the rib of the lid and the strap of the electrode plate group. FIG. 5 is a plan view illustrating an example different from FIG. 4 in the positional relationship between the rib of the lid and the strap of the electrode plate group. It is a top view which shows the example which increased the strength of the rib of a lid. It is a figure which shows an example different from FIG. 2 of a guide shape. It is a figure which shows the state which the exterior of the electric tank and the partition wall were deformed in a bow shape in the lead storage battery of the conventional structure. It is an enlarged view of the part A of FIG.

Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the embodiments shown below. In the embodiments shown below, technically preferable limitations are made for carrying out the present invention, but these limitations are not essential requirements of the present invention.

As shown in FIG. 1, the lead-acid battery 10 of the embodiment includes an electric tank 1, a lid 2, and six electrode plate groups 3. The shape of the electric tank 1 is a rectangular parallelepiped, and the electric tank 1 has a pair of first walls 11 formed on a pair of long sides of a rectangle forming a bottom surface and a pair of first walls formed on a pair of short sides. It has two walls 12. The inside of the battery case 1 is divided into six cell chambers 4 by five partition walls 13 parallel to the second wall 12. As shown in FIG. 1, the arrangement direction of the cell chambers 4 is the X direction, and the direction perpendicular to this is the Y direction. One electrode plate group 3 is arranged in each of the six cell chambers 4.
In the electrode plate group 3, a plurality of negative electrode plates and positive electrode plates are alternately arranged via a separator, the ears of the negative electrode plates are connected by a negative electrode strap, and the ears of the positive electrode plate are connected by a positive electrode strap. .. The negative electrode strap and the positive electrode strap are arranged at different positions in the width direction of the negative electrode plate and the positive electrode plate (the direction that becomes the Y direction when entering the cell chamber). Further, the electrode plate group 3 has a negative electrode intermediate pole column that rises from one end of the negative electrode strap in the X direction and a positive electrode intermediate pole pillar that rises from the other end of the positive electrode strap in the X direction.

FIG. 2 shows the upper portion of two adjacent cell chambers 4. In this portion, in the adjacent cell chambers 41 and 42, the negative electrode intermediate pole column 31a rising from the negative electrode strap 31 in one cell chamber 41 and the positive electrode intermediate pole pillar 32a rising from the positive electrode strap 32 in the other cell chamber 42. Is connected by a metal portion 33a that fills the inside of the through hole 13a formed in the partition wall 13. The metal portion 33a is formed into the through hole 13a by sandwiching the portion where the through hole 13a of the partition wall 13 is formed between the negative electrode intermediate pole column 31a and the positive electrode intermediate pole column 32a and resistance welding the two intermediate pole columns to each other. It was caused.

As shown in FIG. 3, the lid 2 corresponds to the first wall 21 and the second wall 22 corresponding to the first wall 11 and the second wall 12 of the electric tank 1, and the partition wall 13 of the electric tank 1. It has five partition plates 23 and a rectangular upper plate 24. Further, the lid 2 has six liquid injection holes 25 penetrating the upper plate 24, a pair of facing walls 26 forming a sleeve continuous with the liquid injection holes 25, and all the partition plates 23 on both sides in the thickness direction. It has a protrusion 6 arranged on the inner surface of the second wall 22. The first wall 21, the second wall 22, the partition plate 23, the facing wall 26, and the protrusion 6 project from the inner surface of the upper plate 24 (the surface facing the electric tank 1). The lid 2 is integrally molded into the shape shown in FIG. 3 by injection molding of a synthetic resin.

As shown in FIG. 3, the protrusions 6 are arranged at two positions in the short side direction of the upper plate 24 (Y direction perpendicular to the arrangement direction of the cell chamber 4). As shown in FIG. 4, these two locations are above the negative electrode strap 31 and the positive electrode strap 32 constituting the electrode plate group 3, and in the portion where the negative electrode intermediate pole column 31a and the positive electrode intermediate pole column 32a rise from the strap. , Above the negative electrode intermediate pole column 31a and the positive electrode intermediate pole column 32a.
As shown in FIG. 2, the protrusion 6 includes a rib 61 and a guide (positioning guide at the time of welding) 62. The rib 61 is a portion fixed on both sides of the partition plate 23 in the thickness direction, and the guide 62 is continuously formed at the tip of the rib 61. An inclined surface 62a is formed on the inner surface (the surface facing the partition wall 13) of the tip of the guide 62.

In FIG. 2, the first wall 11 of the electric tank 1 is welded to the first wall 21 of the lid 2, the second wall 12 of the electric tank 1 is welded to the second wall 22 of the lid 2, and Each of the five partition plates 23 is fixed to the partition wall 13 of the electric tank 1 by welding, and the upper space 5 is formed on the upper side of the cell chamber 4.
Note that FIG. 2 shows adjacent cell chambers 41 and 42 and upper spaces 51 and 52 formed above the cell chambers 41 and 42. Further, in FIG. 2, when the cell chamber 41 is the leftmost cell chamber 4 in FIG. 1, the left partition wall 13 and the partition plate 23 constituting the cell chamber 41 are the second wall 12 of the electric tank 1 and the partition plate 23, respectively. Corresponds to the second wall 22 of the lid 2. Further, when the cell chamber 42 is the rightmost cell chamber 4 in FIG. 1, the right partition wall 13 and the partition plate 23 constituting the cell chamber 42 are the second wall 12 of the electric tank 1 and the second wall 12 of the lid 2, respectively. Corresponds to the second wall 22.

In this state, each protrusion 6 is arranged above the negative electrode strap 31 or the positive electrode strap 32 constituting the electrode plate group 3 (see also FIG. 4). That is, the ribs 61 fixed on both sides of the partition plate 23 in the thickness direction are arranged above the negative electrode strap 31 and the positive electrode strap 32, respectively. Further, in this state, the guides 62 of the protrusions 6 are arranged on both sides of the partition wall 13 of the electric tank 1 in the thickness direction, and the inclined surfaces 62a of the guide 62 face the partition wall 13. Further, the inclined surface 62a of the guide 62 of the protrusion 6 fixed to the second wall 22 of the lid 2 faces the second wall 12 of the electric tank 1.
Further, in this state, the distance A along the height direction from the boundary K between the partition wall 13 and the partition plate 23 to the tip of the guide 62 and the height from the boundary K to the negative electrode intermediate pole pillar 31a and the positive electrode intermediate pole pillar 32a. The ratio (A / B) to the distance B along the vertical direction is 0.39 (range of 0.15 or more and 0.40 or less). The angle of the inclined surface 62a with respect to the partition wall 13 is 25 ° (range of 20 ° or more and 40 ° or less).

When fixing the lid 2 to the electric tank 1, first, by placing a heated metal plate on the upper surface of the electric tank 1, the upper end surfaces of the first wall 11, the second wall 12, and the partition wall 13 are 1 mm. Melt to a certain thickness. Further, by placing the lid 2 on a heated metal plate, the lower end surfaces of the first wall 21, the second wall 22, and the partition plate 23 are melted to a thickness of about 1 mm. Next, with the inner surface of the upper plate 24 facing the electric tank 1, the first wall 11 and the first wall 21, the second wall 12 and the second wall 22, the partition wall 13 and the partition plate 23 are aligned with each other. The lid 2 is placed on the battery case 1.

At that time, the upper end surface of the partition wall 13 of the electric tank 1 is guided by the inclined surface 62a of the guide 62 of the lid 2 and smoothly contacts the lower end surface of the partition plate 23 of the lid 2. Further, the upper end surface of the second wall 12 of the electric tank 1 is also guided by the inclined surface 62a of the guide 62 of the protrusion 6 of the lid 2 and smoothly contacts the lower end surface of the second wall 22 of the lid 2. Next, the lid 2 is pressed against the battery case 1. As a result, the upper end surface of the first wall 11 and the lower end surface of the first wall 21, the upper end surface of the second wall 12 and the lower end surface of the second wall 22, the upper end surface of the partition wall 13 and the bottom of the partition plate 23 Each end face is heat welded.
As a result, as shown in FIG. 2, the electric tank 1 and the lid 2 are fixed, and the upper space 5 is formed on the upper side of the cell chamber 4. After that, the electrolytic solution is injected into the cell chamber 4 from the liquid injection hole 25, and then a normal step such as closing the liquid injection hole 25 is performed to complete the assembly of the lead storage battery 10.

As shown in FIG. 5, the lead-acid battery 10 of this embodiment is fixed to the vehicle by using the stay 200. Specifically, the lead-acid battery 10 is pressed against the vehicle body from above the lid 2 by tightening the bolts at both ends of the stay 200 in the length direction.
At that time, in the lead-acid battery 10 of this embodiment, since the protrusion 6 having the above configuration is formed on the lid 2, the partition wall 13 of the battery case 1 is deformed into a bow shape even when the tightening force by the stay is too strong. It is difficult to do. As a result, the bow-shaped deformation of the partition wall 13 is suppressed, and a gap is prevented between the negative electrode intermediate pole column 31a and the positive electrode intermediate pole column 32a and the partition wall 13, so that a liquid leak occurs due to overtightening. Can be suppressed. As a result, it is possible to prevent an increase in the internal resistance of the battery due to the occurrence of a liquid leak, and in the case of an idling stop vehicle, it is possible to prevent the idling stop from being prohibited.
In addition, it is possible to prevent the swelling of the battery case due to the expansion and contraction of the active material that occurs due to normal charging and discharging.

In the above embodiment, the protrusion 6 composed of the rib 61 and the guide 62 is arranged above the positive electrode strap 32 and the negative electrode strap 31, but the protrusions 6 are arranged as shown in FIGS. 6 to 8, for example. There may be.
In the example of FIG. 6, the protrusions 6 are arranged at two positions in the Y direction, which are separated from the positive electrode strap 32 and the negative electrode strap 31.
The stress generated when tightened by the stay tends to be concentrated on the portion of the partition wall 13 of the electric tank 1 sandwiched between the negative electrode intermediate pole column 31a and the positive electrode intermediate pole column 32a. Therefore, in the Y direction of the partition wall 13, the portion sandwiched between the negative electrode intermediate pole column 31a and the positive electrode intermediate pole column 32a is more likely to be arched than the other portions.

In the arrangement of FIG. 4 (arrangement of the above embodiment), the protrusion 6 is arranged above the portion that is easily deformed in a bow shape. Therefore, when the arrangement of FIG. 6 and the arrangement of FIG. 4 are compared, the arrangement of FIG. It is highly effective in suppressing bow-shaped deformation in the vicinity, and is highly effective in preventing the occurrence of liquid leaks.
Further, in the arrangement of FIG. 4, the protrusion 6 is present on the first outer wall side as compared with the arrangement of FIG. 6, so that the effect of preventing the bending of the first outer wall is higher.

In the example of FIG. 7, there are three protrusions 6 in the Y direction, two locations above the positive electrode strap 32 and the negative electrode strap 31, and one location separated from the positive electrode strap 32 and the negative electrode strap 31 (of the partition wall 13). It is located in the center).
Comparing the arrangement of FIG. 7 and the arrangement of FIG. 4 (the arrangement of the above-described embodiment), the arrangement of FIG. 7 is more effective in suppressing the bow-shaped deformation of the partition wall 13 of the battery case 1 than the arrangement of FIG. .. This is because, in the case of the arrangement shown in FIG. 7, the bow-shaped deformation in the central portion in the Y direction can be eliminated. Further, the arrangement of FIG. 7 has a higher effect of suppressing the bow-shaped deformation of the partition wall 13 than the arrangement of FIG. 4, and thus the effect of preventing the bending of the first outer wall is higher.

The protrusion 6 may be arranged only at one location in the central portion of the partition wall 13 in the Y direction. In this case, it is preferable that the dimension of the protrusion 6 in the Y direction is larger than the dimension of the positive electrode strap 32 and the negative electrode strap 31 in the Y direction. Further, the dimension of the protrusion 6 in the X direction may be the same as the dimension of the intermediate pole pillar of each strap in the X direction, or may be larger than the dimension of the intermediate pole pillar of each strap in the X direction. That is, by appropriately setting the dimensions of the protrusions 6, the effect of suppressing the bow-shaped deformation of the partition wall 13 can be obtained even if the protrusions 6 are arranged only at one position in the central portion of the partition wall 13 in the Y direction.

In the example of FIG. 8, the protrusion 6 is arranged only above the positive electrode strap 32 and the negative electrode strap 31, and the dimension of the protrusion 6 in the Y direction is slightly smaller than the dimension of the positive electrode strap 32 and the negative electrode strap 31 in the Y direction. The dimensions of the protrusion 6 in the Y direction may be the same as the dimensions of the positive electrode strap 32 and the negative electrode strap 31 in the Y direction, or may be larger than the dimensions of the positive electrode strap 32 and the negative electrode strap 31 in the Y direction. Further, the dimension of the protrusion 6 in the X direction is slightly smaller than the dimension of the intermediate pole pillar of each strap in the X direction, but may be larger than the dimension of the intermediate pole pillar in the X direction.
Comparing the arrangement of FIG. 8 and the arrangement of FIG. 4 (the arrangement of the above embodiment), the arrangement of FIG. 8 is stronger than the arrangement of FIG. 4 because the dimension of the protrusion 6 in the Y direction is larger than that of the arrangement of FIG. The effect of suppressing the bow-shaped deformation of the partition wall 13 of the electric tank 1 is high, and the effect of preventing the bending of the first outer wall is also high.

The partition plate 23 on which the protrusion 6 is formed does not have to be all the partition plates 23, and there may be a partition plate 23 on which the protrusion 6 is not formed. In that case, it is preferable that the protrusion 6 is formed on the partition plate 23 at the center of the X direction, which is pressed by at least the stay 200. For example, a plurality of protrusions 6 may be formed at regular intervals on the partition plate 23 at the center in the X direction, or continuous protrusions 6 may be formed in the Y direction.
Further, as shown in FIG. 9, an arm portion 27 for connecting the protrusion 6 and the facing wall 26 may be provided. The arm portion 27 connects the side surface of the rib 61 of the protrusion 6 and the outer peripheral surface of the facing wall 26, and projects integrally with the side surface of the upper plate 24. Thereby, the strength of the rib 61 can be increased.

As another example of the shape of the protrusion 6, the one shown in FIG. 10 can be mentioned. In the example of FIG. 10A, the tip of the guide 62 of the protrusion 6A is a flat surface 62b. The protrusion 6A has a larger thickness (dimension in the X direction) of the guide 62 than the protrusion 6 shown in FIG. Therefore, if the protrusion 6A of FIG. 10A is provided instead of the protrusion 6 shown in FIG. 2, the strength of the guide 62 increases as the guide 62 becomes thicker, so that the effect of suppressing the bow-shaped deformation of the partition wall 13 is obtained. It gets higher.
In the example of FIG. 10B, the surface of the protrusion 6B facing the partition wall 13 of the guide 62 is an inclined surface 62a at the tip portion 621, but at the base portion 622, which is a portion on the rib 61 side, the partition wall 13 is formed. The surface is parallel to the surface. Therefore, if the protrusion 6B of FIG. 10B is provided instead of the protrusion 6 shown in FIG. 2, the upper end portion of the partition wall 13 can be pressed by the base portion 622, so that the effect of suppressing the bow-shaped deformation of the partition wall 13 is high. Become.

Further, in the examples of FIGS. 2 and 10, the guides 62 are symmetrical with respect to the partition wall 13 by providing protrusions 6, 6A and 6B having the same shape on both sides of the partition plate 23 in the thickness direction. The guides may be asymmetrical with respect to the partition wall 13 by providing protrusions having different shapes. For example, in FIG. 10A, the left protrusion 6A may be left as it is, and the right protrusion 6A may be replaced with the protrusion 6B in FIG. 10B.
Further, the dimensions of the two protrusions adjacent to each other with the partition plate 23 in the X direction may be different. Further, the plurality of protrusions 6 may be arranged at different positions in the Y direction on both sides of the partition plate 23 in the thickness direction. In that case, three or more protrusions 6 may be arranged alternately.

(Test battery)
The lead-acid battery of the example and the lead-acid battery of the comparative example corresponding to the lead-acid battery 10 of the embodiment have external dimensions of a total height of 227 mm, a box height of 200 mm, a width of 125 mm, and a length of 196 mm, and have a liquid-containing mass of 10. We prepared the one that weighs 7 kg. The battery case 1 and the lid 2 of the lead-acid battery 10 have the following dimensions, and the number of positive electrode plates and the number of negative electrode plates constituting the electrode plate group 3 are six. The battery case 1 and the lid 2 were each formed by injection molding using polypropylene. As the electrolytic solution, a normal product of a battery for an idling stop vehicle was used.

The thickness of the first wall 11 and the second wall 12 of the electric tank 1 is 1.5 mm, the thickness of the partition wall 13 is 1.4 mm, and the diameter of the through hole 13a of the partition wall 13 is 8 mm. The X-direction dimension of the cell chamber 4 (C in FIG. 4) is 31.1 mm in the cell chambers at both ends and 29.7 mm in the other cell chambers. The dimension of the cell chamber in the Y direction (D in FIG. 4) is 118 mm, and the depth of the battery case 1 is 187 mm. The thickness of the first wall 21 and the second wall 22 of the lid 2 is 3.75 mm, the thickness of the partition plate 23 is 2.0 mm, and the height dimension of the upper space 5 is 14 mm.

The X-direction dimension of the protrusion 6 is 4.25 mm, and the Y-direction dimension of the protrusion 6 is 2.0 mm. The dimension B after welding is set to be constant at 37 mm, and the dimension A of the protrusion 6 is 0.10 in the ratio (A / B) of Test Nos. 1 to 8 and 0.15 in Test Nos. 9 to 16. , Test Nos. 17 to 24 were changed to 0.35, Test Nos. 25 to 32 were changed to 0.40, and Test Nos. 33 to 40 were changed to 0.45.
In the test group having the same ratio (A / B), the angle θ of the inclined surface of the guide 62 was changed to 10 °, 20 °, 40 °, and 50 °. Further, as a sample having the same ratio (A / B) and angle θ, both the one with the arrangement of the protrusions 6 and the one with the arrangement of FIG. 6 were prepared.
Those satisfying both a θ of 20 ° to 40 ° and a ratio (A / B) of 0.15 to 0.40 correspond to the lead storage battery (Example) of the first aspect. Further, a battery having a ratio (A / B) of 0.15 to 0.40 and having the arrangement of protrusions 6 shown in FIG. 4 corresponds to the lead storage battery of the second aspect.

(Tightening test)
The tightening test was performed by the following method.
Each lead-acid battery was placed on a horizontal base, and the lead-acid battery was tightened from the lid side with a stronger force than usual with respect to the base using the stay 200. The tightening load per bolt of the stay 200 was 980 N. In this state, the ambient temperature was maintained at 60 to 65 ° C. and left for 5 hours to check the battery state after leaving. This test was carried out in accordance with "JIS D5301: 2006 lead-acid battery for starting".
Those with no abnormalities in the battery state after the test were evaluated as acceptable (○), and those with harmful deformation in use were evaluated as rejected (×).

(Overcharge life method)
The overcharge life test was performed by the following method.
First, among the lead-acid batteries after the tightening test, the internal resistance of the lead-acid battery that has passed the test is measured at 25 ° C., and this measured value is used as the initial value of the internal resistance value.
Next, the following processing is performed.

<< Treatment 1: Repeat and pause charging after discharging in the water tank >>
The lead-acid battery after measuring the internal resistance is placed in a water tank at 75 ° C., discharged for 4 minutes at a current of 25 A, and then charged for 10 minutes under the conditions of a control voltage of 14.8 V and a maximum current of 25 A, 480. Repeat once. Next, the lead-acid battery is taken out from the water tank and allowed to stand in an atmosphere of 25 ° C. for 56 hours.
<< Treatment 2: One discharge and charge outside the aquarium >>
Discharge for 30 seconds at a current of 340 A in an atmosphere of 25 ° C. If the final voltage at the 30th second is 7.2 V or less, it is determined that a liquid leak has occurred, and the test is stopped at that point. Next, charging is performed for 10 minutes under the conditions of a control voltage of 14.8 V and a maximum current of 25 A.

After the above-mentioned process 1 was repeated four times, the above-mentioned process 1 was performed once. As a result, charging after discharging in the water tank was repeated 2400 times. Then, after the final treatment 1, the internal resistance of the lead storage battery was measured. This measured value was divided by the above initial value to calculate the degree of increase in internal resistance (relative value when the initial value is 100). If this value is 120 or less, it is judged to be a good product, and if it exceeds 120, it can be judged to be defective. In addition, a liquid leak occurred and charging could not be achieved after 2400 discharges in the water tank, which was also judged to be defective.

(Airtightness test)
An airtightness test was conducted on each lead-acid battery before injection by the following method.
Air is blown into the electric tank at 20 kPa for 5 seconds from the liquid injection hole of each cell, and it is investigated whether the pressure in the electric tank changes during that time. Judged.
This test was performed on 20 lead-acid batteries each to determine the number of defective lead-acid batteries.

(Comprehensive judgment)
Those judged to pass (○) in all of the tightening test, overcharge life test, and airtightness test were passed (○) in the comprehensive judgment, and the others were rejected (×).
These test results and judgment results are shown in Table 1 together with the configuration of the lead storage battery.

As can be seen from the results in Table 1, the results of the overcharge test were poor in Nos. 1 to 8 having a ratio (A / B) of 0.10, and liquid leakage occurred in Nos. 7 and 8. In Nos. 9 to 32 where the ratio (A / B) is 0.15 or more and 0.40 or less, the result of the airtightness test when θ is 10 ° is poor, and when θ is 50 °, it is excessive. The result of the charging test was poor. In Nos. 33 to 40 having a ratio (A / B) of 0.45, the result of the airtightness test was poor.
From the above results, a lead-acid battery having a ratio (A / B) of 0.15 or more and 0.40 or less and a θ of 20 ° or more and 40 ° or less causes liquid leakage when the tightening force of the stay is too strong. It can be seen that this is prevented and the increase in internal resistance is suppressed. A lead-acid battery satisfying these conditions is highly reliable as a lead-acid battery for an idling stop vehicle.

In the case where the ratio (A / B) is 0.15 or more and 0.40 or less and the θ is 50 °, No. 15 and No. 16, No. 23 and No. 24, and No. 31 and No. 32 The arrangement of the protrusions is different for each. Comparing No. 15 and No. 16, No. 23 and No. 24, and No. 31 and No. 32, which differ only in the arrangement of protrusions, the results of the overcharge test show the arrangement shown in FIG. Is a better result than the arrangement shown in FIG. The reason for such a result is that the protrusion 6 is arranged above the negative electrode intermediate pole column and the positive electrode intermediate pole column at a position deviated from the negative electrode intermediate pole column and the positive electrode intermediate pole column. This is because the partition wall of the electric tank in that portion is less likely to be deformed into an arch shape and liquid leakage is less likely to occur than in the case.

10 Lead-acid battery 1 Electric tank 11 First wall of electric tank 12 Second wall of electric tank 13 Partition 13a Through hole of partition 2 Lid 21 First wall of lid 22 Second wall of lid 23 Partition plate 24 Lid Top plate 25 Liquid injection hole 26 Opposing wall 3 Electrode group 31 Negative electrode strap 31a Negative electrode intermediate pole pillar 32 Positive electrode strap 32a Positive electrode intermediate pole pillar 33a Metal part that fills the through hole 4 Cell chamber 41 Cell chamber 42 Cell chamber 5 Upper space 51 Upper space 52 Upper space 6 Protrusions 61 Ribs 62 Guides 62a Inclined surface K Boundary between partition wall and partition plate

Claims (3)

An electric tank made of synthetic resin having a plurality of cell chambers partitioned by a partition wall,
A plurality of electrode plates stored in each of the plurality of cell chambers, and
A synthetic resin lid that seals the upper surface of the battery case,
With
The lid is fixed to the partition wall by welding to form an upper space on the upper side of each of the plurality of cell chambers, ribs fixed on both sides of the partition plate in the thickness direction, and the ribs continuously connected to the ribs. The guides arranged on both sides in the thickness direction of the partition wall are integrally provided.
The electrode plate group includes a positive electrode strap and a negative electrode strap that connect a plurality of positive electrode plates and negative electrode plates at different positions in the width direction, and positive electrode intermediate poles and negative electrode intermediate poles that rise from the positive electrode strap and the negative electrode strap, respectively. With pillars,
The positive electrode intermediate pole column arranged in one of the two adjacent cell chambers and the negative electrode intermediate pole column arranged in the other are connected by a metal portion that fills the through hole formed in the partition wall.
The distance A along the height direction from the boundary between the partition wall and the partition plate to the tip of the guide, and the distance B along the height direction from the boundary to the positive electrode intermediate pole pillar and the negative electrode intermediate pole pillar. The ratio (A / B) to and from is 0.15 or more and 0.40 or less.
A lead-acid battery in which the tip of the guide has an inclined surface facing the partition wall, and the angle of the inclined surface with respect to the partition wall is 20 ° or more and 40 ° or less. The lead-acid battery according to claim 1, wherein the ribs fixed to both sides in the thickness direction of the partition plate have ribs arranged above the positive electrode intermediate pole pillar and the negative electrode intermediate pole pillar, respectively. An electric tank made of synthetic resin having a plurality of cell chambers partitioned by a partition wall,
A plurality of electrode plates stored in each of the plurality of cell chambers, and
A synthetic resin lid that seals the upper surface of the battery case,
With
The lid is fixed to the partition wall by welding to form an upper space on the upper side of each of the plurality of cell chambers, ribs fixed on both sides of the partition plate in the thickness direction, and the ribs continuously connected to the ribs. The guides arranged on both sides in the thickness direction of the partition wall are integrally provided.
The electrode plate group includes a positive electrode strap and a negative electrode strap that connect a plurality of positive electrode plates and negative electrode plates at different positions in the width direction, and positive electrode intermediate poles and negative electrode intermediate poles that rise from the positive electrode strap and the negative electrode strap, respectively. With pillars,
The positive electrode intermediate pole column arranged in one of the two adjacent cell chambers and the negative electrode intermediate pole column arranged in the other are connected by a metal portion that fills the through hole formed in the partition wall.
The distance A along the height direction from the boundary between the partition wall and the partition plate to the tip of the guide, and the distance B along the height direction from the boundary to the positive electrode intermediate pole pillar and the negative electrode intermediate pole pillar. The ratio (A / B) to and from is 0.15 or more and 0.40 or less.
A lead-acid battery having ribs arranged on both sides of the partition plate in the thickness direction, respectively, above the positive electrode intermediate pole pillar and the negative electrode intermediate pole pillar.

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