JP2008034168A - Lead acid storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lead acid storage battery safe and superior in maintenance-free performance by suppressing reduction in the quantity of liquid and variations between the cells and suppressing remaining of hydrogen gas in the liquid type lead acid storage battery. <P>SOLUTION: This is a mono-block type lead acid storage battery having a plurality of cells and has a sheet to be pasted on a lid by a pressure-sensitive adhesive or an adhesive so as to cover an exhaust port of a liquid plug installed on the lid jointed to the battery case. A portion where the pressure-sensitive adhesive or the adhesive is not arranged is provided at a position corresponding to each exhaust port on the pasting face of the sheet. Then, this portion is arranged corresponding to the respective cells as a gas exhaust path to the outside of the battery, and the length of each gas exhaust path is made equal in substance and linear, thereby, reduction of liquid and variations in the liquid quantity between the cells are suppressed, while stay of hydrogen gas in the cell chambers is suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lead-acid battery.

  Lead-acid batteries are used for various purposes such as vehicle engine starting and backup power supply. Among them, the start lead-acid battery supplies power to various electric and electronic devices mounted on the vehicle as well as power to the engine start cell motor. After the engine is started, the battery is charged by the alternator. Here, the output voltage and output current of the alternator are set so that charging and discharging are balanced and the SOC of the lead storage battery is maintained at approximately 100%.

  In most cases, the starting lead-acid battery is installed in the engine room. Therefore, since charging is performed in a high temperature atmosphere of 40 ° C. to 80 ° C., the storage battery is likely to be overcharged. As a result, water in the electrolytic solution is decomposed into oxygen and hydrogen gas by electrolysis and discharged out of the battery. As a result, the electrolyte level is lowered. Even when charging is not performed, the electrolytic solution level is also lowered by the evaporation of moisture from the electrolytic solution or the electrolytic solution mist filled in the battery being dissipated outside the battery.

  The decrease in the electrolyte in the liquid lead-acid battery results in a decrease in battery capacity due to corrosion of the negative electrode strap and oxidation of the negative electrode active material. Therefore, the electrolytic solution level is inspected, and when the liquid level falls below a specified level, water replenishment is performed so that the entire surface of the negative electrode strap and the negative electrode plate is immersed in the electrolytic solution.

  In order to save the labor of such water replenishment work, technical development for suppressing liquid reduction of the liquid lead-acid battery has been continuously performed. For example, the use of an alloy that does not contain Sb, such as a Pb—Ca alloy or a Pb—Sn alloy, that reduces hydrogen overvoltage as a lead alloy for a lead-acid battery grid, widely reduces the amount of liquid due to electrolysis. Are known.

  On the other hand, various studies have been made mainly from the viewpoint of improving the exhaust structure of lead-acid batteries in order to suppress the evaporation of water from the electrolyte and the loss of electrolyte mist filled in the battery due to the dissipation outside the battery. Has been done.

  For example, Patent Document 1 discloses that when exhausting oxygen / hydrogen gas generated from a cell to the outside of the battery, the exhaust path has a maze structure, and water vapor or electrolyte mist passes through the maze structure. A structure is shown in which water is condensed on the wall surface as water or an electrolytic solution, and these are refluxed into the cell.

  Thus, by making the exhaust path of the lead storage battery have a labyrinth structure, it is possible to effectively suppress the reduction of the electrolyte due to the dissipation of water vapor or electrolyte mist to the outside of the battery. However, in order to provide the maze structure in the battery lid, an additional resin molded part is required to provide the maze structure, and the number of parts is related to joining the resin molded part to the lid in the battery manufacturing process. In addition, the number of manufacturing steps increases, which is not preferable in terms of the manufacturing cost of the lead storage battery. In addition, since a liquid spout is generally not provided, replenishment is not possible if the electrolyte level drops below the standard, and even if the internal electrode plate is not deteriorated, the lead storage battery must be replaced and discarded. There was no choice but to waste.

On the other hand, as shown in Patent Document 2, the structure in which the exhaust port of the liquid spigot is covered with a sheet is such that an acid-resistant resin sheet such as polypropylene resin is attached to the lid with an adhesive. When the adhesive is applied to the entire surface of the sheet, the exhaust port is closed, and therefore, the portion where the adhesive is not applied from the portion corresponding to the exhaust port to the end of the sheet is set as the gas discharge path. Such a configuration of Patent Document 2 is very simple compared to the configuration shown in Patent Document 1, and can be realized by simply attaching the sheet to the lid at the stage after the end of charging. This is very advantageous in terms of manufacturing cost.
JP-A-8-22815 JP-A-2005-276741

  With the structure shown in Patent Document 2, the amount of liquid reduction can be suppressed relatively easily. However, the liquid reduction suppression effect varies among cells, and as a result, variations in electrolyte surface occur. At the same time, the amount of hydrogen gas staying in the cell also varied. In other words, since the distance between the liquid spout and the sheet end from which gas is discharged varies depending on the position of the liquid spout, this difference in distance causes variations in the concentration of hydrogen gas remaining in the electrolyte surface and in the cell. It was.

  That is, in the cell closer to the sheet edge, the amount of liquid reduction is larger and the concentration of hydrogen gas remaining in the cell is lower. On the other hand, in a cell farther from the sheet end, the amount of liquid reduction was small and the concentration of hydrogen gas remaining in the cell tended to be high.

  In the monoblock type lead-acid battery having a plurality of cells as described above, the present invention uniformly suppresses liquid reduction in each cell and more quickly releases hydrogen gas remaining inside the cell to the outside of the battery. Therefore, the lead storage battery excellent in safety is provided.

  In order to solve the above-described problem, the invention according to claim 1 of the present invention is a monoblock type lead storage battery composed of a plurality of cells, and is attached to a liquid port provided for each cell of a lid joined to a battery case. A liquid stopper provided with a discharge port for discharging the gas inside the battery, and a sheet bonded to the lid with an adhesive or an adhesive so as to cover the discharge port, and for each of the discharge ports In addition, a portion where no adhesive or adhesive is disposed between the lid and the sheet is used as a gas discharge path, provided between the discharge port and the outside of the battery, and each exhaust path is substantially equidistant, And the lead storage battery provided in the linear form is shown.

  Furthermore, the invention according to claim 2 of the present invention is a monoblock type lead-acid battery composed of a plurality of cells, and is mounted on a liquid port arranged in a row for each cell on a lid joined to a battery case, A liquid spigot provided with a discharge port for discharging the gas, and having a sheet bonded to the lid with an adhesive or an adhesive so as to cover the discharge port, between the lid and the sheet A portion where no adhesive or adhesive is disposed on the gas discharge path is provided in a belt shape so as to pass through each of the discharge ports, and between the discharge ports adjacent to each other of the sheet, the gas discharge path and the sheet The lead storage battery which provided the exhaust port which connects an outer surface is shown.

The invention according to claim 3 of the present invention is the lead storage battery according to claim 1 or 2, wherein the specific resistance of the sheet is 10 ⁴ to 10 ⁸ Ωm.

  Further, the invention according to claim 4 of the present invention is the lead storage battery according to claim 3, wherein the lead storage battery has the sheet brought into contact with a negative electrode terminal provided on the lid.

  According to the configuration of the present invention described above, in the monoblock type liquid lead-acid battery having a plurality of cells, the liquid reduction suppressing effect can be obtained evenly between the cells. Moreover, the remarkable effect that discharge | emission of the hydrogen gas generated in a cell out of a battery can be performed equally and favorably in each cell can be acquired.

(Embodiment 1)
A lead storage battery 1 according to Embodiment 1 of the present invention is a monoblock type battery composed of a plurality of cells shown in FIG. 1, and an electrode plate group 5 having a positive electrode plate 2, a negative electrode plate 3, and a separator 4 is provided. The battery case 7 is housed in a cell chamber 7b partitioned by a partition wall 7a. Note that the battery of the present invention is a liquid type, and an electrolytic solution (not shown) that immerses all electrode plates of at least the positive electrode plate 2 and the negative electrode plate 3 is injected into each cell chamber 7b.

  The battery case 7 is covered with a lid 8, and the lid 8 is provided with a liquid port 8 a for injecting each cell chamber 7 b described above. The liquid port 8a is equipped with a liquid port plug 10 having a discharge port 10a for discharging the gas inside the battery.

  In the lead storage battery 1 of the present invention, a sheet 12 covering the discharge port 10a of the liquid spigot 10 is bonded to the lid 8 with an adhesive or an adhesive. In addition, when the whole surface of the sheet | seat 12 is bonded together with the lid | cover 8 with an adhesive, discharge | emission of the gas from the discharge port 10a is inhibited, there exists a possibility that the internal pressure of the cell chamber 7b may rise and a battery may be damaged. Therefore, by providing a portion where no adhesive or adhesive is disposed between the lid 8 and the sheet 12 as the gas discharge path 13 from the discharge port 10a to the outside of the battery, the gas discharge path 13 staying in the cell chamber 7b is passed through. Discharge out of battery. A hatched portion A in FIG. 1 indicates a portion where the sheet 12 is bonded to the lid 8 with an adhesive or an adhesive, and an arrow schematically shows the flow of exhaust gas in the gas discharge path 13. It is.

  In the present invention, the gas discharge path 13 is in a state where the water vapor pressure is in an equilibrium state with the inside of the cell chamber 7b, and the water vapor is hardly released from the inside of the battery. By setting the path length of the gas discharge path 13 to be substantially the same between the discharge ports 10a, it is possible to obtain a liquid reduction amount suppressing effect in each cell more uniformly. Moreover, since discharge of hydrogen gas to the outside of the battery proceeds without variation between the cells, hydrogen gas stagnation in some cell chambers 7b is suppressed.

  The degree of hydrogen gas retention greatly depends on the shape of the gas discharge path 13. That is, if there is a bent portion in the middle of the gas discharge path 13, the discharge of hydrogen gas is greatly hindered, so the gas discharge path 13 is linear. On the other hand, the dissipation of water vapor is remarkably suppressed by arranging the sheet 12 so that the surface of the sheet 12 is substantially perpendicular to the flow of water vapor from the discharge port 10a. There is no need to bend the path 13. Therefore, in order to suppress the discharge of hydrogen gas and the dissipation of water vapor, the gas discharge path 13 is not bent but is linear.

(Embodiment 2)
The lead storage battery 21 according to the second embodiment of the present invention is obtained by changing the configuration of the sheet 12 and the gas discharge path 13 related thereto in the battery 1 according to the first embodiment. The configuration of the electrode plate group 5, the battery case 7, the lid 8, the liquid spigot 10, and the components associated therewith is the same as that of the battery 1 of the first embodiment.

  The lead storage battery 21 of the present invention is a monoblock lead storage battery having a plurality of cells, like the lead storage battery 1 of the present invention. As shown in FIG. 2, the liquid port plug 10 is provided with a discharge port 10 a for discharging gas inside the battery in the liquid ports 8 a arranged in a row for each cell of the lid 8 joined to the battery case 7. Is installed. And the sheet | seat 22 is bonded by the adhesive or the adhesive agent to the lid | cover 8 so that these discharge ports 10a may be covered.

  In the lead storage battery 21, a strip-like gas discharge path 23 is provided corresponding to the liquid stoppers 10 arranged in a row. As in the first embodiment, the gas discharge path 23 can be obtained by providing, in a row, portions where the adhesive or adhesive used for bonding is not disposed between the sheet 22 and the lid 8. In FIG. 2, a portion where the adhesive or adhesive is disposed is shown as a hatched portion B, and a portion other than the hatched portion B corresponds to the gas discharge path 23.

  In the second embodiment of the present invention, an exhaust port 24 penetrating the outer surface of the sheet 22 from the bonding surface side between the gas discharge path 23 and the lid 8 of the sheet 22 is disposed between the adjacent exhaust ports 10a. Deploy. Hydrogen gas generated in the battery is discharged out of the battery together with oxygen gas from the discharge port 10a through the gas discharge path 23 and from the gas discharge path 23 through the exhaust port 24. As the opening shape of the exhaust port 24, various shapes such as a circle, a square, or a rectangle can be used.

  In addition, the exhaust port 24 is provided in the position of substantially equal distance from the exhaust port 10a which adjoins mutually. According to such a configuration of the present invention, as in the first embodiment, hydrogen gas can be smoothly discharged outside the battery in any cell while suppressing variations in liquid reduction between cells. The stagnation of hydrogen gas in the cell chamber 7b is suppressed.

In the lead storage batteries 1 and 21 of the first and second embodiments described above, the specific resistance of the sheets 12 and 22 to be bonded to the lid 8 is more preferably 10 ⁴ to 10 ⁸ Ωm. Since the sheets 12 and 22 are bonded onto the liquid stopper 10, the sheets 12 and 22 must be peeled from the lid 8 when refilling the cell chamber 7 b. When the sheets 12 and 22 are peeled from the lid 8, static electricity is charged to the sheets 12 and 22. Further, when the lead storage battery 1 and the lead storage battery 21 are wiped with a waste cloth, static electricity is charged on the lid 8 and the sheets 12 and 22.

When the charged static electricity sparks, the hydrogen gas remaining in the gas discharge paths 13 and 23 and the cell chamber 7b may be ignited. In a more preferred embodiment of the present invention, by setting the specific resistance of the sheets 12 and 22 to 10 ⁴ to 10 ⁸ Ωm, static charge around the gas discharge paths 13 and 23 and generation of spark discharge due to this are suppressed. Inflammation to hydrogen gas is suppressed.

In addition to setting the specific resistance of the sheets 12 and 22 to 10 ⁴ to 10 ⁸ Ωm, more preferably, a part of the sheets 12 and 22 is brought into contact with the negative electrode terminal 6 as shown in FIG. Since the generated static electricity is quickly discharged to the negative electrode terminal 6, charging of static electricity around the gas discharge paths 12 and 23 and spark discharge caused thereby are further suppressed. It is preferable for enhancing the safety of the storage battery.

  In a typical lead-acid battery for automobiles, the negative electrode terminal 6 has a structure in which a bushing 6 a insert-molded on the lid 8 and a pole column 5 a connected to the electrode plate group 5 are welded. As shown in FIG. 3, by providing the bushing 6a with contact pieces 6b that come into contact with the sheets 12, 22, the sheets 12, 22 and the negative electrode terminal 6 come into contact at the same time as the sheets 12, 22 are bonded to the lid 8. Therefore, in the battery manufacturing process, it is not necessary to connect the sheets 12 and 22 and the negative electrode terminal 6 in a separate process, which reduces the number of manufacturing steps, which is preferable in terms of productivity improvement.

  Hereinafter, the effects of the present invention will be described with reference to examples.

(Example 1)
A battery according to the present invention and a comparative example described later (80D26 type battery defined in JIS D5301 (lead storage battery for starting)) is manufactured, and the amount of liquid reduction for each cell when charged while applying vibration to each battery The residual hydrogen concentration in the cell chamber was measured.

  In both the batteries of the present invention and the comparative example, an expanded lattice using a Pb-0.07 wt% Ca-1.0 wt% Sn alloy as a positive electrode lattice, and Pb-0.07 wt% Ca-0.3 wt% Sn as a negative electrode lattice. Each expanded lattice using an alloy was used.

  Further, in both the batteries of the present invention and the comparative example, a microporous film in which silica and mineral oil were added to polyethylene resin was used as a separator, and this was used in a form of wrapping a negative electrode plate.

  As specific test conditions, the ambient temperature during charging was 60 ° C., and the vibration was applied in the vertical direction for 2000 hours at an acceleration of 14 V, 1 G (30 Hz). Thereafter, the hydrogen gas concentration in the cell was measured when the battery was left in an atmosphere at 25 ° C. for 60 minutes.

  Next, the structure of the battery of this invention example and a comparative example is demonstrated. The battery A of the present invention is the lead storage battery 1 according to Embodiment 1 shown in FIG. 1, and the length of the gas discharge path 13 provided in a straight line is 50.0 mm. The length of the gas discharge path 13 is 30 mm on one side from the center of the liquid stopper 10 and 20 mm on the other side, and is provided at the same distance for each cell.

  The battery B of the present invention example is the lead storage battery 21 according to the second embodiment shown in FIG. It has a strip-like gas discharge path 23 provided over a width of 260 mm of the lead storage battery 21 with a width of 10 mm, the distance between the discharge ports 10a is 34.0 mm, and a circular opening shape with a diameter of 1.5 mm at the midpoint An exhaust port 24 having

  The battery C of the comparative example is a battery obtained by removing the sheets 12 and 22 from the battery A and the battery B of the above-described example of the present invention.

  The battery D of the comparative example is the same as the battery B of the present invention, in which the exhaust ports 24 are not provided, and only the openings at both ends of the gas discharge path 23 are exhaust ports.

  In the battery E of the comparative example, the sheet 12 of the battery A of the present invention example is a sheet 41 shown in FIG. In addition, the part other than that is formed as the gas discharge path 42 by applying an adhesive to the shaded portion C in FIG. The gas discharge path 42 has a path length of 60 mm and a path width of 7 mm, and is constant between cells. The gas discharge path 42 is provided with two 90 ° bent portions 42a.

The materials of the sheets 12, 22, and 41 used in the batteries A and B of the present invention example and the batteries D and E of the comparative example are 0.2 mm thick polypropylene resin sheets (resistivity 10 ⁸ Ωm), and are adhesive. It was bonded to the lid with an acrylic emulsion adhesive as an agent.

  Table 1 shows the measurement results of the liquid reduction amount for each of the batteries A and B of the above-described invention examples and the batteries C, D and E of the comparative examples. Cell No. Were assigned numbers 1 to 6 sequentially from the positive electrode terminal side to the negative electrode terminal 6 side of the battery. Moreover, the amount of liquid reduction is No. of the battery C of a comparative example. It is shown as a percentage when the liquid reduction amount in one cell is 100.

  From the results shown in Table 1, regarding the battery C of the comparative example that does not have a sheet, the variation in the amount of liquid reduction between the cells is suppressed low, and the maximum-minimum difference is 4%. On the other hand, in the battery E of the comparative example, although the liquid reduction amount is suppressed as compared with the battery C of the comparative example, the variation in the liquid reduction amount depending on the cell position is very large. Specifically, the difference between both ends and the cells adjacent to both ends (No. 1, No. 2, No. 5 and No. 6) and the cells located in the middle (No. 3 and No. 4) The maximum-minimum difference was 28%. Due to such a difference in the amount of liquid reduction, a difference in the electrolyte concentration occurs, which causes a performance difference between cells. While charging and discharging are repeated, the performance difference between the cells may increase, and the battery life may be reduced.

  Regarding the batteries A and B of the example of the present invention, and the battery D of the comparative example, the amount of liquid reduction was suppressed as compared with the battery C of the comparative example, and the variation in the amount of liquid reduction between cells was low and suppressed. . From these results, even if the bent part 42a is provided in the gas discharge path 42 as in the battery D of the comparative example, the bent in the gas discharge paths 13 and 23 as in the battery A and the battery B of the present invention example. It can be seen that there is almost no difference in the amount of liquid reduction compared with the case where no part is provided.

  Next, as described above, the residual hydrogen concentration in the cell was measured for each cell 60 minutes after stopping the charging of each battery. These measurement results are shown in Table 2.

  From the results shown in Table 2, the battery A and the battery B of the present invention have almost no increase in the residual hydrogen concentration even when compared with the battery C of the comparative example having no sheet, and the concentration between the cells. It can be seen that the variation is also suppressed. The battery D of the comparative example was very good in the amount of liquid reduction and its variation, but it can be seen that the residual hydrogen concentration is high and the hydrogen gas emission in the cell is significantly inhibited. Furthermore, for the battery E of the comparative example, No. 3 and no. Residual hydrogen concentration was very high in 4 cells. If spark discharge occurs due to a short circuit or the like in a state where such a residual hydrogen concentration is high, combustion of hydrogen gas accompanied by sound may proceed, which is not preferable for safety.

  Therefore, the battery A and the battery B of the example of the present invention suppress the liquid reduction amount and the variation while reducing the residual hydrogen concentration in the cell and the variation compared to the batteries C to E of the comparative example. It can be seen that the most preferable effect is obtained.

(Example 2)
In Example 2, the battery 1 and battery B of the present invention used in Example 1 and the battery E and battery C of the comparative example were charged at 100 mA for 10 hours and then left for 60 minutes to generate electricity in the lid. 15 kV static electricity was applied from the apparatus, and the battery state at that time was observed.

For the batteries A, B and C, in addition to the sheet having the specific resistance of 10 ⁸ Ωm used in Example 1, the static electricity application experiment was also performed in the case where the specific resistance was 10 ⁴ Ωm and 10 ¹⁰ Ωm. Went. Here, the sheet A of the battery A having a specific resistance of 10 ⁴ Ωm was designated as battery A1, and the battery having a specific resistance of 10 ¹⁰ Ωm was designated as battery A2. A battery B1 having a specific resistance of 10 ⁴ Ωm and a specific resistance of 10 ¹⁰ Ωm was designated as a battery B2. Further, a battery E1 having a specific resistance of 10 ⁴ Ωm of the sheet 41 of the battery E and a battery E2 having a specific resistance of 10 ¹⁰ Ωm.

  The batteries A, A1, A2, B, B1, B2, and the batteries E, E1, E2 are not in contact with the sheets 12, 22, 41 and the negative terminal 6, but in the present embodiment, these batteries are not in contact with each other. The sheet | seat 12,22,41 was extended to the negative electrode terminal 6, and the battery which made the sheet | seat 12,22,41 and the negative electrode terminal 6 contact was created. A battery in which the sheet 12, 22, 41 and the negative electrode terminal 6 are in contact with each other is given a suffix C at the end of the battery symbol.

  Table 3 shows the battery state in the static electricity application test for each of the batteries described above.

From the results shown in Table 3, with respect to the batteries A and B of the examples of the present invention, there was no change in the battery state even when static electricity was applied, particularly by setting the specific resistance of the sheets 12 and 22 to 10 ⁴ to 10 ⁸ Ωm. In the battery A2 in which the specific resistance of the sheet 12 was 10 ¹⁰ Ωm, the small sound caused by the flammable combustion to the hydrogen gas by static spark discharge and the volume reduction during the hydrogen gas combustion was produced. In this battery A2, the generation of small sounds was suppressed by adopting a configuration in which the sheet 12 was in contact with the negative electrode terminal 6 (battery A2C). Therefore, in order to suppress the ignition of hydrogen gas, it is preferable that the specific resistance of the sheet 12 is 10 ⁴ to 10 ⁸ Ωm, and the sheet and the negative electrode terminal 6 are brought into contact with each other. It can be seen that such a configuration suppresses electrostatic charging of the battery and is preferable for safety.

  Regarding the batteries of the comparative examples, generation of small sounds due to hydrogen gas combustion was recognized in all the batteries of the comparative examples except the battery E1C.

If the specific resistance of the sheets 12, 22, 41 is less than 10 ⁴ Ωm, the positive electrode-negative electrode terminal 6 is closed via the sheets 12, 22, 41 and the adhering water due to water adhesion to the lid. When the positive electrode terminal and the sheets 12, 22, 41 are contacted with a metal tool such as a wrench when discharging is performed and the battery capacity is lost or when the harness is tightened to the positive electrode terminal, the positive electrode − Since the space between the negative electrode terminals 6 is closed, it is not preferable. Therefore, the specific resistance of the sheets 12, 22, and 41 is preferably 10 ⁴ Ωm or less.

  As described above, according to the configuration of the present invention, while maintaining the configuration capable of replenishing the lead storage battery, it is possible to suppress the liquid reduction amount and the variation between the cells, and the hydrogen gas stays in the cell chamber. Therefore, it is possible to provide a lead storage battery that is preferable in terms of safety and excellent in maintenance-free properties.

  The present invention uniformly suppresses liquid reduction due to water evaporation inside the lead-acid battery and improves the escape of hydrogen gas remaining inside the battery case, and in a particularly preferred form, it is possible to suppress static charge, It is possible to provide a maintenance-free type lead-acid battery that is superior in terms of safety, and is extremely effective for liquid-type lead-acid batteries including start-up lead-acid batteries.

Sectional drawing which shows the lead acid battery of this invention The figure which shows the other lead acid battery of this invention The figure which shows the principal part cross section of the lead acid battery of this invention. The figure which shows the sheet | seat applied to the lead acid battery of the comparative example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lead acid battery 2 Positive electrode plate 3 Negative electrode plate 4 Separator 5 Electrode plate group 5a Polar column 6 Negative electrode terminal 6a Bushing 6b Contact piece 7 Battery case 7a Partition wall 7b Cell chamber 8 Lid 8a Liquid port 10 Liquid port plug 10a Discharge port 12 Sheet 13 Gas Discharge path 21 Lead storage battery 22 Sheet 23 Gas discharge path 24 Exhaust port 41 Sheet 42 Gas discharge path 42a Bent part

Claims (4)

This is a monoblock type lead-acid battery consisting of multiple cells, which is attached to the liquid port provided for each cell of the lid joined to the battery case, and has a liquid port plug with a discharge port for discharging the gas inside the battery. And a sheet that has a sheet adhered to the lid with an adhesive or an adhesive so as to cover the outlet, and for each of the outlets, no adhesive or adhesive is disposed between the lid and the sheet. As a gas discharge path, between the discharge port and the outside of the battery, and each exhaust path is substantially equidistant and linearly provided. A monoblock type lead-acid battery consisting of a plurality of cells, which is attached to the liquid ports arranged in a row for each cell of the lid joined to the battery case, and is provided with a discharge port for discharging the gas inside the battery A portion having a plug and having a sheet bonded to the lid with an adhesive or an adhesive so as to cover the discharge port, a portion where no adhesive or an adhesive is disposed between the lid and the sheet, As a discharge path, a belt-like shape is provided so as to pass through each of the discharge openings, and an exhaust opening that connects the gas discharge path and the outer surface of the sheet is provided between the discharge openings adjacent to each other in the sheet. Lead acid battery. The lead acid battery according to claim 1 or 2, wherein the sheet has a specific resistance of 10 ⁴ to 10 ⁸ Ωm. The lead acid battery according to claim 3, wherein the sheet is brought into contact with a negative electrode terminal provided on the lid.

Images