JP2019029345A - Lead acid battery - Google Patents

Abstract

To provide a lead acid battery in which fluctuation of liquid measure between cell chambers is suppressed.SOLUTION: A lead acid battery 100 includes an enclosure having multiple housing chambers juxtaposed in a first direction, and multiple through holes communicating with the multiple housing chambers, respectively, a positive electrode and a negative electrode placed in respective housing chambers, multiple liquid port plugs 160 having communication holes communicating with housing chambers different from each other, and an integral sheet 400 placed on the surface of the enclosure. The facing surface of the sheet includes an integral non-junction region 410 not joined to the enclosure and facing at least all communication holes 222 of the multiple liquid port plugs 160, and an integral junction region 420 joined to the enclosure and surrounding the non-junction region 410 over the full length, on the other side of the first communication hole 222 in the first direction from the first end of the enclosure on the first side in the first direction. A part of the non-junction region 410 is extending to the marginal part of the sheet 400.SELECTED DRAWING: Figure 2

Description

  The technology disclosed in this specification relates to a lead-acid battery.

  A lead storage battery is mounted on a vehicle such as an automobile, for example, and is used as a power source for a power source of the vehicle or an electrical component mounted on the vehicle. Such a lead-acid battery has an opening, a battery case in which a plurality of cell chambers arranged in a predetermined direction are formed, a lid joined to the opening of the battery case, and a battery chamber disposed in each cell chamber An electrode plate group. Some of these lead-acid batteries are provided with a plurality of liquid stoppers for replenishing the electrolyte in each cell chamber. Each liquid plug has an exhaust hole that communicates with each cell chamber and discharges gas (oxygen gas or hydrogen gas) generated in the electrode plate in each cell chamber to the outside of the lead storage battery when the lead storage battery is charged. It is common to be.

  In a lead storage battery, a phenomenon in which moisture in the electrolytic solution decreases (hereinafter referred to as “liquid reduction”) may occur. As a cause of the occurrence of this liquid reduction, for example, the following may be considered. When a lead-acid battery is used in a high-temperature environment such as an engine room, water vapor generated by evaporation of a part of the water in the electrolyte is released to the outside of the cell chamber through the exhaust hole of the liquid plug. Alternatively, the electrolyte solution becomes mist and is discharged to the outside of the cell chamber through the exhaust hole of the liquid port plug. Thereby, liquid reduction occurs in each cell chamber. When liquid reduction occurs, there is a possibility that problems such as a decrease in battery capacity and corrosion of the current collector connected to the electrode plate group may occur.

  Therefore, a lead storage battery in which a sheet is arranged on a lid so as to cover the exhaust holes of a plurality of liquid spigots has been conventionally known (for example, see Patent Document 1). In this conventional lead-acid battery, the surface of the sheet facing the lid is opposed to all of the exhaust holes of the plurality of liquid spouts and extends to both ends of the sheet in the predetermined direction, And a joining region that is located at a portion of the sheet around the joining region excluding both ends and joined to the lid. That is, in the conventional lead storage battery, the gas from the exhaust hole of each liquid plug is released to the outside, so that both ends of the sheet are not joined to the lid but are open.

JP 2008-71692 A

  In general, in a lead storage battery provided with a plurality of liquid plugs, the life of the entire lead storage battery is determined by the amount of electrolyte in the cell chamber having the largest liquid reduction amount among the plurality of cell chambers. For this reason, it is preferable to suppress variation in the amount of liquid reduction between the cell chambers from the viewpoint of effective use of the electrolyte solution in each cell chamber. However, in the above-described conventional lead-acid battery, both ends of the sheet are opened, and water vapor generated from the electrolyte is released to the outside together with the gas from each of both ends of the sheet. For this reason, the two cell chambers located in the vicinity of both ends of the sheet have a particularly large amount of liquid reduction, and there is a possibility that a variation in the amount of liquid reduction between the cell chambers cannot be suppressed.

  In this specification, the technique which can suppress the dispersion | variation in the liquid amount between cell chambers is disclosed.

  The lead storage battery disclosed in the present specification is a lead storage battery, in which a plurality of storage chambers arranged in the first direction are formed and a plurality of through holes communicating with each of the plurality of storage chambers are formed. A communication hole that is attached to each of the housing, the positive electrode and the negative electrode disposed in each of the plurality of storage chambers, and the plurality of through holes formed in the housing and communicates with the different storage chambers is formed. A plurality of liquid spigots and an integral sheet disposed on the surface of the casing, and an opposing surface of the sheet facing the casing is an integral one that is not joined to the casing A non-joining region, at least the non-joining region facing all of the communication holes of the plurality of liquid spigots, and an integral joining region joined to the housing, at least, The first side of the housing in the first direction. And the joining region surrounding the entire length of the non-joining region on the other side in the first direction from the first communication hole from the end of the contact hole, and a part of the non-joining region is , And extends to the edge of the sheet at a position different from the joining region in the facing surface.

It is a perspective view which shows the external appearance structure of the lead storage battery 100 in 1st Embodiment of this invention. 3 is an explanatory diagram showing an XY plane configuration of the lead storage battery 100. FIG. It is explanatory drawing which shows the YZ cross-section structure of the lead storage battery 100 in the position of III-III of FIG. It is explanatory drawing which shows the result of the performance evaluation of samples 1-3. It is explanatory drawing which shows the result of the performance evaluation of the samples 4 and 5. It is explanatory drawing which shows the planar structure of the lead storage battery 500 in 2nd Embodiment of this invention.

  The technology disclosed in this specification can be implemented as the following forms.

(1) The lead storage battery disclosed in the present specification is a lead storage battery, and includes a plurality of storage chambers arranged in the first direction and a plurality of through holes communicating with each of the plurality of storage chambers. Communication that is attached to each of the housing chambers that are attached to each of the housing chambers formed, the positive and negative electrodes disposed in each of the plurality of housing chambers, and the plurality of through holes formed in the housing. A plurality of liquid spigots in which holes are formed, and an integral sheet disposed on the surface of the casing, and a facing surface of the sheet facing the casing is joined to the casing. A non-integral non-joining region, at least the non-joining region facing all of the communication holes of the plurality of liquid spigots, and a monolithic joining region joined to the housing , At least one of the casings in the first direction The non-joining region, which surrounds the entire length of the non-joining region on the other side in the first direction from the first communicating hole from the first end of the non-joining region. Is extended to the edge of the sheet at a position different from the joining area on the facing surface.

  In this lead storage battery, the opposing surface of the sheet includes a non-bonded region and a bonded region. A non-joining area | region is an area | region which is not joined to the housing | casing, Comprising: At least the area | region which has opposed all the communicating holes of several liquid port stoppers. The joining region is an integrated region joined to the housing, and at least from the first communication hole from the first end on one side in the arrangement direction (first direction) in which the plurality of storage chambers are arranged. On the other side of the arrangement direction, the non-bonding region is surrounded by the entire length. In addition, a part of the non-bonding area extends to the edge of the sheet at a position different from the bonding area on the opposing surface of the sheet. That is, in this lead storage battery, the edge on one side in the arrangement direction of the sheets is open, but the edge on the other side is closed. Here, in such a configuration, the length of the exhaust path from the communication hole located on one side in the alignment direction to the open edge of the sheet is larger than that of a conventional lead-acid battery in which both edges of the sheet are open. Also, since the difference between the length of the exhaust path from the communication hole located on the other side in the arrangement direction to the edge where the sheet is opened is large, it is considered that the variation in the amount of liquid reduction between the cell chambers increases. However, as a result of intensive studies by the present inventors, the cause of the variation in the amount of liquid reduction between the cell chambers is not limited to the discharge distance from the communication hole of each cell chamber to the open edge of the sheet. I found it. In the configuration in which the edge on one side of the sheet is opened and the other side is closed, the inventors have a variation in the amount of liquid between the cell chambers as compared to a conventional lead storage battery in which both edges of the sheet are opened. For the first time. Therefore, according to the present lead storage battery, as described above, the variation in the liquid amount between the cell chambers can be suppressed by adopting a configuration in which the edge on one side of the sheet is opened and the other side is closed. .

(2) The lead-acid battery further includes a positive electrode terminal and a negative electrode terminal that are spaced apart in the first direction, and the negative electrode terminal is disposed on the one side in the first direction, and the positive electrode The terminal may be arranged on the other side in the first direction.

  For example, it is often arranged near a heat source such as an engine, and the liquid reduction may be promoted by heat from the heat source. In addition, the position of the heat source may be a position that is not equidistant from each of the plurality of cell chambers but a position that is biased to one side of the arrangement direction of the plurality of cell chambers. For example, in a vehicle engine room, the lead storage battery may be arranged such that the positive terminal is located on the engine side and the negative terminal is located on the body frame side of the vehicle. In this case, in the conventional lead-acid battery in which both edges of the sheet are opened, the liquid reduction proceeds remarkably in the cell chamber on the side close to the heat source, and the variation in the liquid reduction amount between the cell chambers may increase. It is good. On the other hand, in this lead storage battery, the edge on the positive electrode terminal side arranged near the heat source in the sheet is closed, and the edge on the negative electrode terminal side arranged far from the heat source is opened. Therefore, it is good also as a structure which can suppress the liquid reduction in the cell chamber near the heat source. Therefore, according to this lead acid battery, it is good also as a structure which can suppress the variation in the liquid reduction amount between cell rooms compared with the conventional lead acid battery.

(3) In the lead acid battery, the part of the non-joining region extends from the first communication hole to the edge of the sheet on the first end side along the first direction. It is good also as a structure. According to the lead storage battery, a part of the non-joining region extends from the first communication hole along the first direction to the edge of the sheet on the first end side. It is good also as a structure which can provide the provided lead storage battery. That is, in general, the sheet may have a configuration in which the non-bonding region and the bonding region are formed while moving the base material of the sheet, for example, in a roll shape. Here, in the configuration in which a part of the non-joining region extends from the first communication hole to the edge of the sheet along the direction intersecting the first direction, a part of the non-joining region is Since it extends in a direction different from the direction orthogonal to the moving direction of the base material, the formation method of the non-bonded area and the bonded area is complicated with respect to the moving base material, and the productivity of the sheet is reduced. It is good also as a structure. On the other hand, according to the lead storage battery, since the entire non-bonded region extends along the direction orthogonal to the moving direction of the base material, the non-bonded region and the bonded region with respect to the moving base material The forming method may be relatively simple and the sheet productivity may be improved.

(4) In the lead-acid battery, the non-joining region includes a first portion extending in an arrangement direction of the plurality of communication holes, and an edge portion of the sheet in a direction intersecting the arrangement direction from the first portion. It is good also as a structure containing the 2nd part extended to. According to the lead storage battery, the non-joining region includes the first portion extending in the arrangement direction of the plurality of communication holes, and the second portion extending from the first portion to the edge of the sheet in a direction crossing the arrangement direction. It is good also as a structure containing these parts. Thereby, it is good also as a structure from which water vapor | steam etc. become difficult to discharge | emit outside compared with the structure to which a non-joining area | region is extended linearly over the full length. As a result, water vapor or the like released from the communication hole of the liquid spout becomes liable to stay in the non-joining region, so that the occurrence of liquid loss in the storage chamber near the heat source can be more effectively suppressed. Also good.

(5) In the lead-acid battery, the sheet may have a water repellent layer. As a result, the water droplets adhering to the sheet are less likely to stay on the sheet, and the water droplets can be prevented from entering the interior of the housing from between the housing and the non-joined region of the sheet.

(6) In the lead-acid battery, the sheet is a region including the non-bonded region and seals the plurality of liquid stoppers, and a character and / or alerting the user. And a display region that is a region on which a graphic is printed, and the water repellent layer may be provided in the sealing region. This makes it difficult for water droplets attached on the sheet to stay in the sealing region including the non-bonded region, and prevents water droplets from entering the inside of the housing from between the housing and the non-bonded region of the sheet. Can do.

A. First embodiment:
A-1. overall structure:
(Configuration of lead-acid battery 100)
FIG. 1 is a perspective view showing an external configuration of a lead storage battery 100 in the present embodiment. In FIG. 1, for convenience, a part of a case 101 described later included in the lead storage battery 100 is broken to show an internal structure. FIG. 2 is an explanatory diagram showing an XY plane configuration of the lead storage battery 100, and FIG. 3 is an explanatory diagram showing a YZ cross-sectional configuration of the lead storage battery 100 at the position of III-III in FIG. In each figure, XYZ axes orthogonal to each other for specifying the direction are shown. In this specification, for convenience, the positive Z-axis direction is referred to as “upward”, and the negative Z-axis direction is referred to as “downward”. However, the lead storage battery 100 is actually different from such a direction. It may be installed in the direction. Further, hereinafter, “P” is added to the end of the reference symbol of the positive electrode side component, and “N” is added to the end of the reference symbol of the negative electrode side component, and when both structures are substantially the same, The description of the components on the side may be omitted. In each drawing, a sheet 400 to be described later is shown through a facing surface 400A (see FIG. 3) of the sheet 400.

  As shown in FIGS. 1 to 3, the lead storage battery 100 includes a housing 101 and an electrode plate group 104. The housing 101 includes a battery case 102 and a lid 106. The battery case 102 is a substantially rectangular parallelepiped container having an open upper surface, and is made of, for example, a synthetic resin. A housing space inside the housing 101 is partitioned into six cell chambers S arranged in a predetermined direction (X-axis direction) by a partition wall 103. In each cell chamber S, an electrolytic solution U and an electrode plate group 104 are separated. Contained. The electrolyte U is, for example, dilute sulfuric acid. Hereinafter, the arrangement direction (X-axis direction) of the six cell chambers S is referred to as “cell arrangement direction”. When the six cell chambers S are described separately, the first cell chamber S1, the second cell chamber S2, and the third cell are sequentially arranged from the cell chamber S close to the terminal portion 150P on the positive electrode side described later. The chamber S3, the fourth cell chamber S4, the fifth cell chamber S5, and the sixth cell chamber S6 shall be called. The cell chamber S corresponds to the storage chamber in the claims, and the cell arrangement direction corresponds to the first direction in the claims.

(Configuration of electrode plate group 104)
The electrode plate group 104 includes a plurality of flat plate-like positive electrode plates 110P, a plurality of flat plate-like negative electrode plates 110N, and a plurality of separators 120 disposed between the positive electrode plate 110P and the negative electrode plate 110N. Each of the electrode plates 110P and 110N is a conductive member in which a lattice body is filled with an active material. The plurality of positive plates 110P are connected by a positive current collecting member 112P, and the plurality of negative plates 110N are connected by a negative current collecting member 112N. In the cell chambers S, the current collecting members 112P and 112N having different polarities are connected to each other via the connecting member 130, whereby the plurality of electrode plate groups 104 are electrically connected in series.

(Configuration of lid 106)
The lid 106 is a substantially rectangular member whose bottom surface is open, has a size corresponding to the upper end opening of the battery case 102, and is formed of, for example, synthetic resin. The lid 106 is fitted into the upper end opening of the battery case 102, and the lid 106 and the battery case 102 are, for example, thermally welded, so that each cell chamber S is in a sealed state.

  The lid 106 is provided with a terminal portion 150P on the positive electrode side and a terminal portion 150N on the negative electrode side. The terminal portion 150P on the positive electrode side and the terminal portion 150N on the negative electrode side are respectively disposed near both ends in the cell arrangement direction (X-axis direction). The positive terminal portion 150P corresponds to the positive terminal in the claims, and the negative terminal portion 150N corresponds to the negative terminal in the claims. Since the positive terminal portion 150P and the negative terminal portion 150N have substantially the same configuration, the configuration will be described below using the positive terminal portion 150P as an example.

  As shown in FIG. 3, the terminal portion 150P on the positive electrode side includes a bushing 152P and a pole column 154P. The bushing 152P is a substantially cylindrical conductive member in which a hole penetrating in the vertical direction is formed, and is formed of a metal such as a lead alloy, for example. The lower portion of the bushing 152P is embedded in the lid 106 by insert molding, and the upper portion of the bushing 152P protrudes upward from the upper surface of the lid 106. The tip of the bushing 152P functions as a positive-side external connection terminal connected to a load or the like (not shown). The pole column 154P is a substantially cylindrical conductive member, and is formed of a metal such as a lead alloy, for example. The pole 154P is inserted into the hole of the bushing 152P. The upper end portion of the pole column 154P is disposed at substantially the same position as the upper end portion of the bushing 152P. The lower end portion of the pole column 154P protrudes downward from the lower end portion of the bushing 152P, and further below the lower surface of the lid 106. It protrudes. The upper end portion of the pole column 154P is joined to the bushing 152P by welding, and the lower end portion of the pole column 154P is joined to the above-described positive current collector 112P.

  As shown in FIG. 3, a mounting hole 106 </ b> A that penetrates the lid 106 in the vertical direction is formed immediately above each cell chamber S in the lid 106. A liquid stopper 160 is attached to the attachment hole 106A. The lead storage battery 100 of the present embodiment is a so-called flat type lead storage battery in which the upper surface of the liquid spigot 160 is substantially flush with the upper surface of the lid 106. The mounting hole 106A corresponds to a through hole in the claims. Hereinafter, of the both ends of the cell arrangement direction (X-axis direction) in the casing 101 (lid 106), the end on the positive electrode side terminal portion 150P side is referred to as the “positive end 101P on the negative electrode side of the casing 101”. An end on the terminal portion 150N side is referred to as “an end 101N on the negative electrode side of the casing 101”.

(Configuration of liquid spout 160)
As shown in FIG. 3, the liquid spout 160 includes a liquid spout main body 200 and a splash-proof body 300. The liquid spout main body 200 includes a cylindrical portion 210 and a head portion 220. The cylindrical portion 210 has a cylindrical shape that extends in the vertical direction (Z-axis direction). The lower end of the cylindrical portion 210 is open. The head portion 220 has a circular flat plate shape and is disposed so as to seal the upper side of the tubular portion 210. The head 220 is formed with a communication hole 222 that penetrates the head 220 in the vertical direction and communicates the housing space inside the housing 101 with the outside of the housing 101 (see also FIGS. 1 and 2). . The outer diameter of the head portion 220 is larger than the outer diameter of the tubular portion 210, and the peripheral portion of the head portion 220 projects outward from the tubular portion 210 over the entire circumference. The cylindrical part 210 and the head part 220 are integrally formed of resin, for example.

  The splashproof body 300 is accommodated in the cylindrical portion 210. The splashproof body 300 has a plurality of splashproof plates 330. Since the splash-proof body 300 includes the plurality of splash-proof plates 330, the gas exhaust path in the cylindrical portion 210 is a maze. Thereby, the liquid spout 160 allows the gas generated in the battery case 102 to pass through relatively easily, but the electrolyte U is prevented from easily leaking from the communication hole 222 of the head 220. As shown in FIG. 2, a disc-shaped filter 360 is disposed between the head 220 and the splash-proof body 300 in the cylindrical portion 210. The filter 360 is, for example, an explosion-proof filter that ignites the hydrogen gas discharged from the communication hole 222 of the head 220 and prevents the hydrogen gas in the housing 101 from igniting and exploding.

(Configuration of sheet 400)
As shown in FIGS. 1 to 3, a sheet 400 is bonded to the upper surface of the lid 106. The sheet 400 is a rectangular sheet extending in the cell arrangement direction (X-axis direction), and is formed of a resin material such as polypropylene resin. Hereinafter, of the both ends in the cell arrangement direction in the sheet 400, the end on the positive electrode side terminal portion 150P side is referred to as “the positive electrode side end 400P of the sheet 400”, and the end side on the negative electrode side terminal portion 150N side is “ The negative side 400N of the sheet 400 ". The negative electrode side end 400N corresponds to a first end in the claims.

  As shown in FIG. 2, the non-bonding region 410 and the bonding region 420 are included in the facing surface 400 </ b> A of the sheet 400 that faces the top surface of the lid 106. The non-bonding region 410 is an integral region that is not bonded to the upper surface of the lid 106. Further, the non-joining region 410 is a continuous region facing at least all of the communication holes 222 of the six liquid plugs 160. In other words, the non-bonded region 410 is a continuous region that covers all of the six liquid plugs 160 when viewed in the vertical direction (Z direction). Specifically, the non-bonding region 410 extends linearly in the cell arrangement direction, and the end of the non-bonding region 410 on the positive electrode side terminal portion 150P side (hereinafter simply referred to as “positive electrode side end portion 410P”). ) Does not extend to the positive electrode side edge 400P of the sheet 400, and the end portion 410N on the negative electrode side terminal portion 150N side in the non-bonded region 410 (hereinafter simply referred to as “negative electrode side end portion 410N”) 400 extends to 400N on the negative electrode side edge 400N.

  The joining area 420 is an integral area joined to the upper surface of the lid 106 via an adhesive, for example. Further, the bonding region 420 is a continuous region surrounding the entire length of the non-bonding region 410 other than the end portion on the negative electrode side terminal portion 150N side. In the present embodiment, the bonding region 420 is the entire region excluding the non-bonding region 410 in the facing surface 400 </ b> A of the sheet 400.

  With the above configuration, in the lead storage battery 100, the non-bonded region 410 in the sheet 400 communicates with the six communication holes 222, and the exhaust path in which only the end portion 410 </ b> N on the negative electrode side is opened in the periphery of the non-bonded region 410. Forming. The negative side 400N of the sheet 400 corresponds to the edge of the sheet in the claims, and the communication hole 222 of the cell chamber S6 corresponds to the first communication hole in the claims. Further, in the non-bonded region 410, a portion from the communication hole 222 of the cell chamber S6 to the negative electrode side end 101N of the housing 101 corresponds to a part of the non-bonded region in the claims.

  As shown in FIG. 2, the sheet 400 is formed with slits 224 (specifically, cross cuts) at portions facing the respective liquid spigots 160. The slit 224 is closed when the internal pressure in the cell chamber S is equal to or lower than a predetermined pressure. When the internal pressure in the cell chamber S exceeds a predetermined pressure, the slit 224 is opened by being pushed up by the internal pressure. Thereby, since the gas in the housing | casing 101 is discharge | released via the communicating hole 222 and the slit 224, the internal pressure rise in the cell chamber S can be suppressed.

A-2. Performance evaluation:
Performance evaluation was performed on the lead storage battery samples 1 to 5 having different sheet configurations. As will be described later, the sample 3 has the same configuration as the lead storage battery 100 including the sheet 400 of the present embodiment described above, and the samples 1, 2, 4, and 5 Only the configuration is different, and the other configurations are common. However, hereinafter, for the sake of convenience, the sheets of Samples 1, 2, 4, and 5 are denoted by the same reference numerals as those of the sheet 400 of the present embodiment.

(Evaluation method)
In this performance evaluation, the liquid level measurement test of the electrolyte solution U was performed for each of the samples 1 to 5. In the liquid level measurement test, each sample is placed in a predetermined environment, and the amount of decrease in the amount of electrolyte U in each of the six cell chambers S is measured. It is a test to evaluate the degree. Specifically, in the liquid level measurement test, the positive electrode terminal portion 150P side is positioned on the engine (not shown) side in the engine room of a vehicle (not shown) using the engine as a power source. The terminal portion 150N on the negative electrode side is disposed on the body frame (not shown) side of the vehicle. Thus, by moving the terminal portion 150P on the positive electrode side of the lead storage battery away from the grounded body frame, for example, when the vehicle collides, the terminal portion 150P on the positive electrode side and the body frame come into contact with each other to generate a spark and ignite. It is possible to suppress the occurrence of such a situation. Further, since the engine becomes a heat source when the engine is driven, the cell chamber S closer to the positive terminal portion 150P located on the engine side is exposed to a higher temperature environment.

In addition, before the liquid level measurement test, the liquid level height of the electrolytic solution U in each cell chamber S is the initial height (for example, the upper limit value of the liquid level height of the electrolytic solution U that can be filled in the battery case 102). Match the upper level). And the running pattern which repeats the following (a)-(d) 40 times is performed on the vehicle carrying each sample.
(A) Travel for 2 hours at a speed of about 60 (km / h) (b) Maintain idling stop for 2 hours (c) Repeat (a) and (b) three times (d) Maintain stop for 12 hours For each cell chamber S, for example, using a ruler or a height gauge, the liquid level distance from the initial height of the electrolytic solution U (= initial height−the liquid level height of the electrolytic solution U after execution of the traveling pattern (mm )) Is measured.

(Evaluation results)
FIG. 4 is an explanatory diagram showing the results of performance evaluation of samples 1 to 3, and FIG. 5 is an explanatory diagram showing the results of performance evaluation of samples 4 and 5. 4 and 5 schematically show the top surface configuration of the lid 106 in each sample, and the same reference numerals are omitted as appropriate. In each figure, the “+” mark means the positive electrode side, and the “−” mark means the negative electrode side.

  As shown in FIG. 4, the sample 1 is different from the lead storage battery 100 in that both the positive electrode side and the negative electrode side of the sheet 400 are opened. Specifically, in sample 1, the positive electrode side end 410P in the non-bonded region 410 extends to the positive electrode side edge 400P of the sheet 400, and the negative electrode side end 410N in the non-bonded region 410 is the sheet 400. To the negative side 400N. In the evaluation result of sample 1, the amount of liquid reduction (6.4 (mm)) in the first cell chamber S1 located closest to the positive electrode is the largest, and the decrease in the third cell chamber S3 and the fourth cell chamber S4. The liquid volume (4.0 (mm)) is the smallest. For this reason, the maximum variation amount of the liquid reduction amount between the cell chambers S is 2.4 (mm). In addition, the amount of liquid reduction in the sixth cell chamber S6 located closest to the negative electrode side is 5.2 (mm), and similarly, the amount of liquid reduction in the first cell chamber S1 located in the vicinity of the open end of the sheet 400 is reduced. Less than the amount. This means that the amount of electrolyte U in the cell chamber S is reduced not only in the length of the discharge path from the communication hole 222 in the cell chamber S to the open end of the sheet 400 but also in the cell chamber S and the heat source. This means that the distance between and is greatly affected.

  The sample 2 is different from the lead storage battery 100 in that the positive electrode side of the sheet 400 is opened and the negative electrode side is closed. Specifically, in Sample 2, the positive electrode side end 410P in the non-bonding region 410 extends to the positive electrode side edge 400P of the sheet 400, and the negative electrode side end 410N in the non-bonding region 410 is the sheet 400. It does not extend to the negative side 400N. In the evaluation result of sample 2, the amount of liquid reduction (5.4 (mm)) in the first cell chamber S1 located closest to the positive electrode is the largest, and the decrease in the third cell chamber S3 and the fourth cell chamber S4. The liquid volume (3.3 (mm)) is the smallest. For this reason, the maximum variation amount of the liquid reduction amount between the cell chambers S is 2.1 (mm). Further, the amount of liquid reduction in the sixth cell chamber S6 located closest to the negative electrode side is 4.2 (mm), and similarly, the amount of liquid reduction in the first cell chamber S1 located in the vicinity of the open end of the sheet 400 is reduced. Less than the amount. This is because, as with the evaluation result of sample 1, the amount of the electrolyte solution U in the cell chamber S is not limited to the length of the discharge path from the communication hole 222 of the cell chamber S to the open end of the sheet 400, As described above, this means that the distance between the cell chamber S and the heat source greatly affects.

  Further, comparing the evaluation results of sample 2 and sample 1, sample 2 shows that the maximum variation amount of the liquid reduction amount between cell chambers S is smaller than that of sample 1, and the open end of sheet 400 is also reduced. The amount of liquid reduction in the cell chamber S located in the vicinity of is also reduced. This is because, in the configuration in which one side in the cell arrangement direction of the sheet 400 is open and the other side is closed, the liquid reduction amount between the cell chambers S is less than that in the configuration in which both sides of the sheet 400 are open. It means that it is possible to suppress both of the amount of S to be reduced with the largest amount. In the sample 2, compared to the sample 1, the amount of open parts in the sheet 400 is small, and the lead storage battery 100 as a whole has a sheet of water vapor or electrolyte mist (hereinafter referred to as “water vapor”) discharged from the communication hole 222. The amount released to the outside of 400 is reduced. For this reason, the lifetime of the lead storage battery 100 can be prolonged by reducing the amount of liquid reduction in the cell chamber with the largest amount of liquid reduction.

  Sample 3 has the same configuration as 100 of the above embodiment, and the negative side of the sheet 400 is opened and the positive side is closed. Specifically, in Sample 3, the positive electrode side end 410P in the non-bonded region 410 does not extend to the positive electrode side edge 400P of the sheet 400, and the negative electrode side end 410N in the non-bonded region 410 400 extends to 400N on the negative electrode side edge 400N. In the evaluation result of sample 3, the amount of liquid reduction (4.6 (mm)) in the first cell chamber S1 located closest to the positive electrode is the largest, and the decrease in the third cell chamber S3 and the fourth cell chamber S4. The liquid volume (3.2 (mm)) is the smallest. For this reason, the maximum variation amount of the liquid reduction amount between the cell chambers S is 1.4 (mm). Further, the amount of liquid reduction in the sixth cell chamber S6 located closest to the negative electrode side is 4.6 (mm), and similarly, the amount of liquid reduction in the first cell chamber S1 located in the vicinity of the open end of the sheet 400 is reduced. It was the same as the amount.

  Comparing the evaluation results between sample 3 and sample 2, sample 3 has a smaller maximum variation in the amount of liquid reduction between cell chambers S than sample 2, and is near the open end of sheet 400. The amount of liquid reduction in the cell chamber S located at the same position has also decreased, and the difference in the amount of liquid electrolyte U in the two cell chambers S located on both ends of the sheet 400 has also decreased. This is because 2 of the both ends of the sheet 400 are located on both ends of the non-bonded region 410 by closing the ends close to the heat source and opening the ends far from the heat source. This means that the difference in the amount of liquid reduction between the two cell chambers S can be suppressed. In sample 3, the exhaust path from the communication hole 222 of the cell chamber S6 closest to the heat source to the open end of the sheet 400 is the exhaust from each communication hole 222 of the other cell chambers S1 to S5 to the open end of the sheet 400. The water vapor | steam etc. which were discharged | emitted from each communicating hole 222 of cell chamber S1-S5 exist in this discharge | emission path | route. For this reason, it becomes difficult for water vapor | steam etc. to be discharged | emitted from the communicating hole 222 of cell chamber S6 by the pressure of the water vapor | steam etc. from each communicating hole 222 of cell chamber S1-S5. For this reason, liquid reduction of the cell chamber S6 closest to the heat source can be more effectively suppressed.

  As shown in FIG. 5, the sample 4 is common to the lead storage battery 100 in that the communication hole 222 of the sixth cell chamber S6 is closest to the open end of the sheet 400, but the communication of the sixth cell chamber S6 is common. The lead storage battery 100 differs from the lead storage battery 100 in that the opening direction from the hole 222 to the open end of the sheet 400 is different from the cell arrangement direction (X-axis direction). Specifically, in the sample 4, the non-bonding region 410 includes a first portion 411 that covers the six communication holes 222 and extends linearly in the cell arrangement direction, and a communication hole 222 of the sixth cell chamber S6. And a second portion 412 extending to the edge of the sheet 400 in a direction orthogonal to the first portion 411. In the evaluation result of sample 4, the amount of liquid reduction (4.4 (mm)) in the first cell chamber S1 located closest to the positive electrode is the largest, and the decrease in the third cell chamber S3 and the fourth cell chamber S4. The liquid volume (3.0 (mm)) is the smallest. For this reason, the maximum variation amount of the liquid reduction amount between the cell chambers S is 1.4 (mm). In addition, the amount of liquid reduction in the sixth cell chamber S6 located closest to the negative electrode side is 4.4 (mm), and similarly, the amount of liquid reduction in the first cell chamber S1 located in the vicinity of the open end of the sheet 400 is reduced. It was the same as the amount.

  Comparing the evaluation results between the sample 4 and the sample 3, the sample 4 is further reduced in the maximum variation amount of the liquid reduction amount between the cell chambers S as compared with the sample 3, and the open end of the sheet 400 is also reduced. The amount of liquid reduction in the cell chamber S located in the vicinity of is also reduced. This is because, by making the opening direction of the negative electrode side end 410N in the non-bonding region 410 different from the cell arrangement direction, the amount of liquid reduction between the cell chambers S and the amount of liquid reduction of S with the largest liquid reduction amount are as follows. It means that both can be more effectively suppressed. In Sample 4, since the discharge path is a polygonal line, water vapor or the like from each communication hole 222 is less likely to be released to the outside from the open end of the sheet 400 as compared to Sample 3 in which the discharge path is linear. Conceivable.

  The sample 5 is different from the lead storage battery 100 in the shape of the discharge path from the communication hole 222 of the sixth cell chamber S6 to the open end of the sheet 400. Specifically, in the sample 5, the non-bonding region 410 is formed from the first portion 411 and the communication hole 222 of the sixth cell chamber S6 to the positive side 400P of the sheet 400 so as to be folded back. 3 parts 413. In the evaluation result of sample 5, the amount of liquid reduction (4.1 (mm)) in the first cell chamber S1 located closest to the positive electrode is the largest, and the decrease in the third cell chamber S3 and the fourth cell chamber S4. The liquid volume (2.9 (mm)) is the smallest. For this reason, the maximum variation amount of the liquid reduction amount between the cell chambers S is 1.2 (mm). In addition, the amount of liquid reduction in the sixth cell chamber S6 located on the most negative electrode side is 4.1 (mm), and the liquid reduction in the first cell chamber S1 located in the vicinity of the open end of the sheet 400 is similarly performed. It was the same as the amount.

  Comparing the evaluation results of the sample 5 and the sample 4, the sample 5 is further reduced in the maximum variation amount of the liquid reduction amount between the cell chambers S than the sample 4, and the open end of the sheet 400 is also reduced. The amount of liquid reduction in the cell chamber S located in the vicinity of is also reduced. Compared to sample 4, sample 5 has a longer discharge path from the communication hole 222 of the sixth cell chamber S6 to the open end of the sheet 400, and water vapor or the like from each communication hole 222 opens the sheet 400. This is thought to be because it is difficult to discharge from the end to the outside.

  Note that the evaluation results of FIGS. 4 and 5 were common to lead storage batteries having a general size of battery for automobiles (the width in the cell arrangement direction is 100 (cm) to 200 (cm)). Therefore, it is particularly effective to apply the present invention to such a size lead-acid battery.

B. Variation:
The technology disclosed in the present specification is not limited to the above-described embodiment, and can be modified into various forms without departing from the gist thereof. For example, the following modifications are possible.

  In the above embodiment, the position of the end of the sheet 400 in the longitudinal direction does not have to coincide with the position of the end of the casing 101 (lid 106). For example, the negative electrode side end 400N of the sheet 400 may be located closer to the center side (X-axis negative direction side) of the lid 106 than the negative electrode side end 101N of the housing 101. In the above-described embodiment, minute holes may be formed in the bonding region 420 of the sheet 400. In the above embodiment, the slit 224 may not be formed.

  In the above-described embodiment, the bonding area 420 is the entire area excluding the non-bonding area 410 in the facing surface 400A of the sheet 400. However, the present invention is not limited thereto, and the facing surface 400A of the sheet 400 is, for example, A non-bonding region that is arranged on the outer peripheral side of the bonding region 420 and is different from the non-bonding region 410 may be included.

  Moreover, in the said embodiment, although the lead storage battery 100 was arrange | positioned near an engine as a heat source, it is not restricted to this, For example, you may arrange | position near other heat sources, such as a heater.

  In the above embodiment, the lead storage battery 100 is a flat type lead storage battery. However, the lead storage battery 100 is not limited to this. For example, the liquid spigot 160 includes a knob that protrudes upward from the upper surface of the housing 101. It is good also as what is called a pick type lead acid battery. Moreover, in the said embodiment, the number of the cell chambers S in the housing | casing 101 is not restricted to six, What is necessary is just to be two or more. In the present embodiment, the battery case 102 and the lid 106 may be integrally formed.

  Moreover, in the said embodiment, the cylindrical part 210 is not restricted to a cylindrical shape, For example, a rectangular tube shape etc. may be sufficient.

C. Second embodiment:
Another embodiment of the present invention will be described. For convenience of explanation, members having the same functions as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 6 is an explanatory diagram showing an XY plane configuration of the lead storage battery 500 according to the present embodiment. As shown in FIG. 6, a sheet 450 is bonded to the upper surface of the lid 106 of the lead storage battery 500. The sheet 450 includes a non-bonding region 410 and a bonding region 420, and includes a sealing region 430 that seals the liquid spout 160 and a display region 450. The sealing area 430 and the display area 440 are integrally provided. Further, a perforation or the like is provided between the sealing region 430 and the display region 440, for example, so that an operator can peel only the sealing region 430 of the sheet 450 from the lid 106.

  The sheet 450 is subjected to water repellent treatment in the sealing region 430. In other words, the sealing region 430 is provided with a water repellent layer (not shown) including a water repellent material on the surface. The water repellent material is not particularly limited, and a known material can be used. For example, a silicone-based water repellent may be used. Further, as a method of providing the water repellent layer, a sheet 450 in which a water repellent material is applied to the surface of the base material may be used, or a sheet 450 whose base material is a water repellent material may be used.

  The display area 440 is an area (caution label) on which characters and / or figures that call attention to the user of the lead storage battery 500 are printed. Note that the display region 440 is not provided with a water repellent layer.

  The lead storage battery 500 according to this embodiment includes a water repellent layer in the sealing region 430 of the sheet 450. Here, when the lead storage battery 500 is used, water droplets such as rainwater may be applied to the sheet 450. The water droplets adhering to the sheet 450 are sucked into between the non-bonding region 410 and the lid 106 when the temperature in the cell chamber S of the lead storage battery 500 decreases and the inside of the cell chamber S becomes negative pressure. There is a possibility that water droplets may enter the housing 101. When water droplets enter the inside of the housing 101, the amount of the electrolyte solution increases as the electrolyte solution dilutes, causing a liquid leak and corroding the on-vehicle components around the lead storage battery 500.

  On the other hand, in the lead storage battery 500 according to the present embodiment, by providing a water repellent layer in the sealing region 430 of the sheet 450, it is difficult for water droplets to remain in the sealing region 430 including the non-bonding region 410. As a result, it is difficult for water droplets to enter the housing 101 from between the non-bonding region 410 and the lid 106.

  Further, by providing the water repellent layer only on the sealing region 430 instead of on the entire surface of the sheet 450, water droplets attached on the sheet 450 can easily move to the display region 440 where the water repellent layer is not provided. As a result, it is difficult for water droplets to enter the housing 101 from between the non-bonding region 410 and the lid 106.

  Further, comparing the water repellency of the upper surface 106U of the lid 106, the sealing region 430, and the display region 440, the sealing region 430 has the highest water repellency, and then the display region 440 has the highest water repellency. The water repellency of the upper surface 106U of the lid 106 is the lowest. Since the water repellency is in this order, water droplets attached to the upper surface 106U of the lid 106 are difficult to move to the sheet 450, and water droplets attached to the sheet 450 move to the upper surface 106U of the lid 106. easy. This makes it difficult for water droplets to enter the housing 101 from between the non-bonded region 410 and the lid 106. In the present specification, “high water repellency” means a large contact angle with respect to water droplets.

  In the present embodiment, an example in which the sheet 450 includes the sealing region 430 and the display region 440 is shown, but the present invention is not limited to this. The sheet 450 may be provided with only the sealing region 430 provided with the water repellent layer, or the water repellent layer may be provided in both the sealing region 430 and the display region 440. Further, the sealing region 430 and the display region 440 may be provided separately.

  Furthermore, in the above-described embodiment, the opening direction of the negative-side end 410N of the non-bonding region 410 may be different from the cell arrangement direction.

  100, 500: Lead storage battery 101: Housing 101N: End on the negative electrode side of the housing 101P: End on the positive electrode side of the housing 101 102: Battery case 103: Partition 104: Electrode group 106: Lid 106A: Mounting hole 106U : Upper surface 110N: Negative electrode plate 110P: Positive electrode plate 112P, 112N: Current collecting member 120: Separator 130: Connection member 150N: Negative electrode side terminal portion 150P: Positive electrode side terminal portion 152P: Bushing 154P: Polar column 160: Liquid plug 200: Liquid stopper main body 210: Cylindrical portion 220: Head portion 222: Communication hole 224: Slit 300: Splash-proof body 330: Splash-proof plate 360: Filter 400, 450: Sheet 400A: Opposing surface 400N: Negative electrode side edge 400P: positive electrode side edge 410: non-bonding region 410N: negative electrode side edge portion 410P: positive electrode side End portion 411: First portion 412: Second portion 413: Third portion 414: Fourth portion 420: Bonding region 430: Sealing region 440: Display region S (S1 to S6): Cell chamber U: Electrolyte

Claims (6)

A lead acid battery,
A housing in which a plurality of storage chambers arranged in the first direction are formed and a plurality of through holes communicating with each of the plurality of storage chambers are formed;
A positive electrode and a negative electrode disposed in each of the plurality of storage chambers;
A plurality of liquid spigots attached to each of the plurality of through-holes formed in the housing and having communication holes communicating with the storage chambers different from each other;
An integral sheet disposed on the surface of the housing,
The facing surface of the sheet facing the housing is
An integral non-bonded region that is not bonded to the housing, at least the non-bonded region facing all of the communication holes of the plurality of liquid spigots;
An integral joining region joined to the housing, and at least in the first direction from the first communication hole from the first end on one side of the housing in the first direction. On the other side, the joining region surrounding the entire length of the non-joining region,
A part of the non-joining region is a lead storage battery that extends to an edge of the sheet at a position different from the joining region in the facing surface. The lead acid battery according to claim 1,
A positive electrode terminal and a negative electrode terminal that are spaced apart from each other in the first direction;
The negative terminal is disposed on the one side in the first direction;
The lead acid battery, wherein the positive terminal is disposed on the other side in the first direction. The lead-acid battery according to claim 1 or 2,
The part of the non-joining region is a lead-acid battery extending from the first communication hole to the edge of the sheet on the first end side along the first direction. The lead-acid battery according to any one of claims 1 to 3,
The non-joining region includes a first portion extending in the arrangement direction of the plurality of communication holes, and a second portion extending from the first portion to the edge of the sheet in a direction intersecting the arrangement direction. Lead acid battery including A lead-acid battery according to any one of claims 1 to 4,
The sheet is a lead storage battery having a water repellent layer. The lead acid battery according to claim 5,
The sheet is an area including the non-bonded area, and is a sealed area that seals the plurality of liquid spigots, and an area printed with characters and / or figures that call attention to the user. Display area,
The water repellent layer is a lead acid battery provided in the sealing region.

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