JP4887648B2 - Lead acid battery - Google Patents

Description

  The present invention relates to a lead-acid battery.

  Lead-acid batteries are used for various purposes including starting automobiles. Especially for lead-acid batteries for starting automobiles, the positive and negative electrode plate surfaces are all immersed in the electrolyte (dilute sulfuric acid), and the liquid plug (exhaust plug) that connects the inside and outside of the battery is liquid. The so-called liquid lead-acid battery attached to the mouth is the mainstream. In some cases, a negative electrode absorption control valve type lead-acid battery is also used in which oxygen gas generated in the battery is absorbed by the negative electrode plate exposed from the electrolytic solution.

  The negative electrode absorption type control valve type lead acid battery absorbs oxygen gas generated from the positive electrode plate at the time of charging on the negative electrode plate, thereby suppressing hydrogen generation on the negative electrode plate. Decomposition and a decrease in water content in the electrolyte due to this are suppressed.

  However, since it is necessary to expose the negative electrode plate from the electrolytic solution, there is a problem that the amount of the electrolytic solution is limited and, as a result, the discharge capacity is limited as compared with the liquid lead-acid battery.

  On the other hand, in the liquid type lead-acid battery, since both positive and negative electrode plates are immersed in the electrolyte, the electrolyte around the electrode plate can be set more than the control valve type lead-acid battery, This is advantageous in terms of discharge capacity.

  Liquid lead-acid batteries are more advantageous than control valve-type lead-acid batteries in terms of discharge capacity, but oxygen / hydrogen gas that has accumulated in the batteries is discharged through an exhaust hole provided in the liquid plug. Therefore, the amount of water reduction (liquid reduction) in the electrolyte is larger than that of the control valve type lead-acid battery.

  The water reduction through the liquid stopper progresses by evaporation as well as electrolysis of the electrolyte water as described above. In particular, lead-acid batteries for starting automobiles are often installed in a high-temperature engine room, and are under use conditions where moisture evaporation is further promoted.

  Also, the electrolyte mist generated by the fluctuation of the electrolyte surface generated by acceleration / deceleration and vibration during vehicle travel and the degassing of the oxygen / hydrogen gas generated by charging by the alternator on the vehicle side is exhausted. Liquid reduction also proceeds by dissipating outside the battery through the holes.

  In order to suppress such moisture reduction in the electrolytic solution, for example, Patent Document 1 shows that a porous body is provided in the exhaust passage in the liquid stopper, and pressure loss and pore diameter due to the porous body are controlled. ing.

  As a result, the electrolyte mist in the battery and the gas (air and oxygen / hydrogen gas) having evaporated moisture are not easily replaced with the external gas (air), and the electrolyte mist and evaporated moisture in the porous body. As a result of dew condensation and recirculation inside the battery, the water content in the battery is reduced.

  Although the porous body provided in the exhaust path can suppress the water loss of the electrolyte to a certain extent, the exhaust path is always formed inside and outside the battery, so it is stored and used especially at an ambient temperature exceeding 40 ° C. At that time, the amount of the electrolyte solution decreased was still large.

  On the other hand, Patent Document 2 discloses a battery that includes a control valve and has a positive and negative electrode plate immersed in an electrolytic solution. In Patent Document 2, a control valve is attached to the liquid injection port, so that the liquid cannot be easily replenished. When the electrolytic solution is reduced during use, the replenishment cannot be performed, so that a significant decrease in the discharge capacity can be avoided. There is nothing.

Furthermore, Patent Document 3 discloses a lead storage battery in which a control valve structure is provided in a liquid spout. However, since the liquid spout and the valve structure are integrally provided, it cannot be shared with a liquid spout that does not have a conventional valve structure. Therefore, since it becomes a completely different part, it has become an obstacle to the cost reduction of the lead storage battery.
Japanese Patent Laid-Open No. 7-220706 JP 2003-142148 A JP 2003-346781 A

  In the lead storage battery in which all of the positive and negative electrode plates are immersed in the electrolyte as described above, the present invention does not have a conventional valve structure when the valve structure is provided in the liquid spigot. The purpose of this is to make it possible to share parts with the liquid spout, thereby reducing the burden of parts inventory management and reducing the manufacturing cost of lead-acid batteries.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present invention is equipped with a liquid port plug provided with a vent hole for discharging gas inside the battery to the outside of the battery at a liquid port provided in the battery exterior. And a lead storage battery in which the entire surface of the positive electrode plate surface and the negative electrode plate surface is immersed in an electrolyte solution, provided separately from the main body cylinder inside the main body cylinder of the liquid plug, and according to the internal pressure of the battery A control valve portion having a vent path formed from an exhaust port provided at one end to a vent port provided at the other end and having an outer diameter in contact with the inner diameter of the main body cylinder of less than 10 kPa is mounted. The characteristic lead acid battery is shown.

According to a second aspect of the present invention, a liquid port plug provided with a vent for discharging gas inside the battery to the outside of the battery is attached to a liquid port provided in the battery exterior, and the positive electrode plate surface A lead-acid battery in which the entire surface of the negative electrode plate is immersed in an electrolytic solution, and is provided separately from the main body cylinder inside the main body cylinder of the liquid plug and is provided with an exhaust port provided at one end according to the battery internal pressure A control valve portion that forms a ventilation path from the vent hole provided at one end to the other end is mounted, and the control valve portion includes a bottom wall having an exhaust hole and a side wall provided around the bottom wall. And a valve body disposed so as to cover the exhaust hole in the valve housing body, and a presser plate disposed on the valve body and partially joined to the side wall.

  According to a third aspect of the present invention, in the lead storage battery of the second aspect, an elastic body is interposed between the valve body and the presser plate.

In the invention according to claim 4 of the present invention, a liquid port plug provided with a vent hole for discharging gas inside the battery to the outside of the battery is attached to a liquid port provided on the battery exterior, A lead-acid battery in which the entire surface of the negative electrode plate is immersed in an electrolytic solution, and is provided separately from the main body cylinder inside the main body cylinder of the liquid plug and is provided with an exhaust port provided at one end according to the battery internal pressure A control valve part that forms a ventilation path is attached to a vent hole provided at one end of the other end, and the control valve part includes a bottom wall having an exhaust hole, a side wall provided around the bottom wall, and the exhaust gas. A valve cylinder that protrudes from the hole opening in the same direction as the protruding direction of the side wall; a cap-shaped valve body mounted on the valve cylinder; and a top surface of the cap-shaped valve body, and one of them The portion includes a press plate joined to the side wall.

  Furthermore, the invention according to claim 5 of the present invention is the lead-acid battery according to claims 1 to 4, wherein the porous filter has air permeability on the path between the vent hole and the control valve portion in the main body cylinder. It is characterized by arranging.

  The invention according to claim 6 of the present invention is characterized in that, in the lead storage battery according to claims 2 to 4, the pressing plate is made of a porous body having air permeability.

  The invention according to claim 7 of the present invention is characterized in that, in the lead storage battery according to claims 1 to 6, a splash-proof plate facing the exhaust hole is arranged in the main body cylinder.

  According to the present invention, it is possible to share components with and without the valve structure in the liquid stopper, and there is a remarkable effect that the manufacturing cost of the lead storage battery is reduced.

  Embodiments of the present invention will be described below.

(First embodiment)
FIG. 1 is a diagram showing a cross-section of a main part of a lead storage battery according to an embodiment of the present invention.

  In the lead storage battery 10 of the present invention, a liquid port plug 13 provided with a vent hole 12 for discharging gas inside the battery to the outside of the battery is mounted on a liquid port 11 provided on the battery exterior. In the example shown in FIG. 1, an example in which the liquid port 11 is provided in the lid 14 as the battery exterior is shown.

  In the positive electrode plate 16, the negative electrode plate 17 and the separator 18 housed in the battery case 15 of the lead storage battery 10, the entire surface of the electrode plate surface of the positive electrode plate 16 and the electrode plate surface of the negative electrode plate 17 is immersed in the electrolytic solution 19. have.

  In the lead storage battery 10 of the present invention, the main body cylinder 20 of the liquid spout 13 is provided separately from the main body cylinder 20 and from the exhaust hole 22 provided at one end to the other end according to the battery internal pressure. A control valve portion 21 that forms (opens) a ventilation path over the provided ventilation hole 28 is mounted.

  Since the control valve part 21 is provided separately from the main body cylinder 20, the main body cylinder 20 can be shared with a liquid spout that does not have the control valve part 21. And since the exclusive main body cylinder is not required when manufacturing the liquid spigot provided with the control valve part, the manufacturing cost of lead acid battery can be reduced notably. Moreover, the burden of parts inventory management can be reduced.

  The lead storage battery 10 of the present invention is a battery in which the positive and negative electrode plate surfaces are all immersed in the electrolytic solution 19 and proceeds with a so-called oxygen gas absorption reaction in which oxygen gas generated in the positive electrode plate is absorbed by the negative electrode plate. Therefore, the valve opening pressure of the control valve section 21 may be set lower than the valve opening valve (about 10 kPa to 20 kPa) of the control valve in the oxygen gas absorption control valve type lead-acid battery.

  In the lead storage battery 10 of the present invention, the control valve portion 21 is opened due to an increase in the internal pressure of the battery due to oxygen / hydrogen gas generated in the battery at the time of overcharge, and the exhaust valve 22 provided at one end is provided at the other end. A ventilation path is formed in the ventilation hole 28. Oxygen gas / hydrogen gas passes through the control valve portion 21 and the vent hole 12 from the inside of the battery c and is discharged outside the battery d.

  On the other hand, at the time of normal charging or discharging, the control valve unit 21 is closed, and the electrolyte mist generated by the generation of gas in the battery c and the electrolyte mist generated by vibration applied to the lead storage battery are easily It is not discharged outside the battery d. Further, since the gas inside the battery c (mainly air) is in contact with the electrolytic solution 19, much moisture is dissolved as compared with the outside air outside the battery d. Since the gas inside the battery c is not easily replaced with the outside air outside the battery d, the liquid reduction generated in the conventional liquid lead acid battery can be suppressed.

  In addition, since the electrode plate is immersed in the electrolyte surface, even when oxygen gas enters the battery inside c from outside the battery d, the amount of the electrolyte is limited, such as occurs in a negative electrode absorption lead storage battery, The oxidation reaction of the negative electrode plate does not occur. Therefore, the control valve portion 21 only needs to have a sealing property that can suppress the dissipation of water vapor or electrolyte mist inside the battery c to the outside d of the battery.

  Various methods are conceivable for mounting the control valve unit 21 in the main body cylinder 20, but the outer diameter of the control valve unit 21 is set slightly larger than the inner diameter of the main body cylinder 20, and the control valve unit 21 is installed in the main body cylinder 20. Can be press-fitted into and installed. What is necessary is just to comprise the part which contacts the main body cylinder 20 of the main body cylinder 20 and the control valve part 21 with the synthetic resin material which has the elasticity suitable for press fit fixation, such as a polypropylene resin and a polyethylene resin.

  As another method, a male screw may be formed on the outer periphery of the control valve portion 21 and a female screw may be formed on the inner periphery of the main body cylinder 20, and both may be screwed together to mount the control valve section 21 in the main body cylinder. . In addition, the packing 2 for ensuring airtightness of the liquid spigot 13 and the lid | cover 14 and prevention of loosening can be used suitably.

(Second Embodiment)
In the 2nd Example of this invention, the preferable structure of the control valve part 21 in the above-mentioned lead acid battery 10 of this invention is shown.

  FIG. 2 is a view showing a cross section of the control valve portion 21, and FIG. 3 is an assembly view in which each component of the control valve portion 21 is in an exploded state.

  The control valve unit 21 covers the exhaust hole 22 in the valve storage body 25 including a bottom wall 23 having an exhaust hole 22 and a side wall 24 provided around the bottom wall 23. The valve body 26 is disposed, and a presser plate 27 is disposed on the valve body 26 and a part thereof is joined to the side wall 24.

  The valve body 26 has elasticity in the thickness direction, and the exhaust hole 22 and the valve body 26 surface are in close contact with each other by a pressing plate 27. Further, a notch 27a for ventilation is provided in a part of the holding plate 27, and a ventilation hole 28 is provided.

  When the pressure inside the battery c increases, the valve body 26 is compressed by the internal pressure, and a gap is formed between the bottom wall 23 around the exhaust hole 22 and the valve body 26, and between the exhaust hole 22 and the vent hole 28, That is, a ventilation path is formed between one end a and one end b of the control valve portion 21. The gas staying in the battery interior c is dissipated to the battery exterior b through the ventilation path, the battery internal pressure is lowered, and the close contact between the valve body 26 and the bottom wall around the exhaust hole 22 is restored.

  The valve body 26 has elasticity in the thickness direction and is made of an acid-resistant material such as chloroprene rubber, silicon rubber, fluorine rubber, or EPDM rubber. Moreover, since the valve body 26 should just have elasticity in the thickness direction as a whole, the valve body 26 whole can be comprised with these rubber materials.

  Moreover, the valve body 26 can be comprised separately by the valve plate 26a and the elastic body 26b. The valve plate 26a and the elastic body 26b can use the above rubber, but the elastic body 26b can be foamed rubber. In particular, an independent foam rubber is preferable because the elastic force hardly decreases with time.

  Further, the valve plate 26a may be made of a non-elastic polyethylene sheet or a hard rubber plate, and an elastic body 26b such as elastic rubber foam may be laminated on the valve plate 26a. It may be a laminate of the body 26b.

  Further, the bottom wall 23 and the valve body 26 may stick to each other, and a liquid lubricant such as silicon oil or fluorine oil is applied to these contact surfaces as necessary in order to suppress such sticking.

  The side wall 24 and the presser plate 27 can be fixed by providing a fitting convex portion 27b on the outer periphery of the presser plate 27 and a fitting concave portion 25a on the side wall 24 and fitting them together. Moreover, the side wall 24 and the pressing plate 27 can be formed of a thermoplastic resin, and these can be fixed by thermal welding.

  In addition, although the example which provided the notch 27a for providing the vent hole 28 in the press plate 27 was shown, since a vent hole should just be obtained, it is good also as a through-hole. However, in the case of using a through-hole, even if a drilling process is required in a later process or a through-hole is formed by molding, the through-hole is blocked by a burr at the time of molding, and an inspection process for eliminating it is necessary. Since it may be necessary, the cutout 27a is more convenient and preferable.

  Since the configuration of the control valve portion 21 according to the second embodiment as described above uses a plate-like member as the valve body 26, the thickness dimension of the control valve portion 21 can be reduced. This is effective for cost reduction.

(Third embodiment)
The third embodiment of the present invention is a lead storage battery including the control valve unit 41 shown in FIG. 4 as a control valve unit in the lead storage battery of the first embodiment described above.

  The control valve portion 41 is provided so as to protrude in the same direction as the protruding direction of the side wall 44 from the bottom wall 43 having the exhaust hole 42, the side wall 44 provided around the bottom wall 43, and the opening of the exhaust hole 42. The valve cylinder 45, a cap-shaped valve body 46 attached to the valve cylinder 45, and a presser plate 27 that is disposed above the top surface of the cap-shaped valve body 46 and partially joined to the side wall 44. .

  The structure of the holding plate 27 can be the same as that of the second embodiment. If necessary, a liquid lubricant such as silicon oil or fluorine oil is applied to the contact surface between the cap-shaped valve body 46 and the valve cylinder 45 to suppress sticking.

  In the third embodiment using the cap-shaped valve body 46, the elastic body 26b as used in the control valve unit 21 of the second embodiment is not used. When the elastic body 26b is in a compressed state for a long period of time, the repulsive force decreases, and in some cases, the adhesion between the valve body 26 and the bottom wall 23 may vary. In the third embodiment, however, As compared with that of the second embodiment, it is possible to suppress the variation in the adhesiveness and the variation in the valve opening pressure due to this.

  However, since the thickness dimension of the control valve portion 41 tends to increase as much as the valve cylinder 45 is formed, the second embodiment is preferable when it is desired to further reduce the thickness dimension of the control valve portion 41. In addition, although what used the plate-shaped or cap-shaped valve body was shown as above-mentioned 2nd Embodiment and 3rd Embodiment, the valve body of another structure can also be used.

(Fourth embodiment)
FIG. 5 is a diagram showing a cross section of the main part of a lead storage battery 50 according to the fourth embodiment of the present invention. The lead storage battery 50 of the present invention is the lead storage battery of the first to third embodiments described above, and the vent hole 12 and the control valve portion 21 (or the control valve portion 41) in the main body cylinder 20 of the liquid spout 13. The porous filter 51 having air permeability is arranged on the path of the above.

  The porous filter 51 can prevent the foreign matter such as dust and sand particles from dropping from the outside of the battery to the control valve portion 21 (41), and can stabilize the valve opening operation of the control valve. Further, when the flame generated outside the battery d or the electric spark ignites oxygen / hydrogen gas existing around the exhaust hole 22, the flammable flame reaches the control valve portion 21 (41) and damages the control valve portion. However, by arranging the porous filter 51, it is possible to suppress the arrival of the flammable flame to the control valve portion 21 (41) and to suppress the damage of the control valve portion due to the flammable flame.

  The pore diameter of the porous filter 51 may be determined in consideration of clogging due to foreign matters such as dust and sand particles, the permeation suppression effect of the flammable flame, and the permeation speed of oxygen / hydrogen gas. The thing of ten to several hundred micrometers can be used. As the material, alumina powder, polyethylene resin, polypropylene resin, or a powder of a copolymer of these resins can be sintered and subjected to water repellent treatment as necessary.

  The size and shape of the porous filter 51 is a disc shape having substantially the same diameter as the control valve portion 21 (41), and the porous filter 51 is mounted in the main body cylinder 20, and then the control valve portion 21 (41) is attached to the main body cylinder. What is necessary is just to mount and fix in 20. In such a configuration, since the control valve portion 21 (41) functions as a fixing member that prevents the porous filter 51 from falling off the main body cylinder 20, there is no need to separately fix the porous filter, which is preferable. It is.

  Further, the porous filter 51 can be fixed on the holding plate 27 in advance by adhesion, welding or the like.

(Fifth embodiment)
FIG. 6 is a view showing a cross section of the control valve portion 61 of the lead storage battery according to the fifth embodiment of the present invention. The lead acid battery according to the fifth embodiment of the present invention uses a porous filter 62 as the presser plate 27 in the lead acid batteries according to the second to third embodiments.

  In this case, since the porous filter 62 has the explosion-proof and dust-proof function of the porous filter 51 in the fourth embodiment and the function as the presser plate 27 that holds the valve body, it is not necessary to provide these separately. A remarkable cost reduction effect due to the reduction in the number of points is obtained, and the structure is extremely preferable.

  In this case, the porous filter 62 can be the same as the porous filter 51 described above.

  Further, since the porous filter 62 itself has air permeability, it is not necessary to provide the notch 27 a provided in the holding plate 27 for setting the air passage. In this case, the outside of the porous filter 62 acts as the vent hole 28.

(Sixth embodiment)
FIG. 7 is a view showing a cross section of a lead-acid battery 70 according to the sixth embodiment of the present invention. The lead storage battery 70 according to the sixth embodiment of the present invention is the lead storage battery according to the first to fifth embodiments of the present invention, in which the splash-proof plate 71 facing the exhaust hole 22 is arranged in the main body cylinder 20. It is characterized by. In addition, in FIG. 7, the example applied to the lead acid battery by 2nd Embodiment is shown.

  In the lead-acid battery of the present invention, unlike the control valve type lead-acid battery that has almost no electrolyte released from the electrode plate group, there is an electrolyte that immerses the entire electrode plate surface. The surface may swing and the electrolyte may adhere to the control valve unit 21 (41, 61).

  In such a case, the valve opening operation of the control valve unit 21 (41, 61) may be hindered. That is, the valve element 26 (cap-shaped valve element 46) sticks to the bottom wall 23 (43) due to the sulfuric acid content in the electrolyte, and the valve opening pressure becomes abnormally high or sticks.

  According to the configuration as described above, the valve body 26 (cap-shaped valve body 46) and the bottom due to the sulfuric acid content in the electrolyte solution are suppressed by suppressing the adhesion of sulfuric acid to the control valve portion 21 (41, 61). The sticking to the wall 23 (43) can be suppressed, and the valve opening pressure can be stabilized, which is preferable. At the same time, since the rise of the electrolyte mist to the vicinity of the valve body 26 is suppressed, the dissipation of the electrolyte mist to the outside of the battery when the valve is opened can be suppressed, and the amount of liquid reduction can be further reduced.

  As a method for arranging the splash-proof plate 71, various methods are conceivable. As shown in FIG. 7, a column 75 is provided from the base portion 74, and a splash-proof member provided with the splash-proof plate 71 on the column 75 is provided. It is possible to use a configuration that is inserted into the main body cylinder 20 and fitted and locked between the base portion 74 and the inner wall of the main body cylinder 20.

  In addition to the splash-proof plate 71 facing the exhaust hole 22, it is also effective to provide inclined tilted splash-proof plates 72a, 72b, 72c. Such an inclined splash-proof plate inhibits the rise of the electrolytic solution and has an action of refluxing the once raised electrolytic solution to the lower part. The refluxed electrolytic solution is discharged from the liquid spout 13 through the opening 73.

  In addition, in FIG. 7, although the example which has arrange | positioned three pairs of inclination splash-proof boards was shown, the number of sheets can be increased / decreased as needed. In addition, by arranging the splash-proof plate 71 close to the exhaust hole 22, it is possible to suppress liquid reduction due to dissipation of the electrolyte mist.

  However, if it is too close, the electrolytic droplet generated by the condensation of the electrolyte mist on the surface of the splash-proof plate 71 adheres to the exhaust hole 22, so that the growth of the droplet is taken into consideration and the splash-proof plate 71 and the exhaust hole are taken into consideration. It is necessary to provide a distance between the two. The droplet size depends on the specific gravity of the electrolyte, the presence or absence of additives (sodium sulfate) in the electrolyte, its concentration, or the wettability of the splash-proof plate surface, which varies depending on the splash-proof material and its surface condition. Appropriate separation distance is required by evaluation. Usually, it can be set at a distance of about 0.5 mm to 1.0 mm.

  According to the embodiment of the present invention as described above, since the control valve portion and the main body cylinder are configured as separate parts, the main body cylinder can be shared regardless of the presence or absence of the control valve structure, so that the unit price of parts can be reduced, and lead The manufacturing cost of the storage battery can be reduced.

  The effect of the present invention is an effect of reducing the manufacturing cost by allowing the above-mentioned main body cylinder to be shared. In particular, in the seventh embodiment, the electrolyte mist rises to the vicinity of the control valve portion 21 (41). Therefore, it is possible to suppress the dissipation of the electrolyte mist to the outside of the battery when the valve is opened and to further reduce the amount of liquid reduction. In this embodiment, the effect will be described.

  A lead storage battery (55B24 type start lead storage battery in JIS D5301) of the comparative example and the example of the present invention shown below is created, and charging / discharging is performed while applying vibration to the lead storage battery assuming that it is used for vehicles. The amount of liquid reduction was evaluated.

(Comparative battery A)
The battery A of the comparative example is a battery obtained by removing the control valve portion 21 from the lead storage battery 10 of the second embodiment of the present invention shown in FIG.

(Battery B of comparative example)
The battery B of the comparative example is a battery in which the splash-proof plate 71 having the shape shown in FIG.

(Battery C of the present invention example)
The battery C of the example of the present invention is a lead storage battery according to the second embodiment shown in FIGS. 1 and 2.

(Battery D of the present invention example)
The battery D of the present invention example is a lead storage battery according to the sixth embodiment of the present invention shown in FIG.

  Each of the above test batteries did not have a porous filter, and the amount of liquid reduction was evaluated under the test conditions shown below.

Test temperature: 75 ° C
Vibration conditions: vertical direction, sweep excitation (vibration frequency 5Hz-40Hz / 5min)
1G acceleration
Charging / discharging conditions: Discharging 25A × 1 minute, charging 14.8V × 10 minutes (maximum charging current 25A)
The amount of liquid reduction was measured when 4320 cycles of the above charge / discharge cycle were performed. In the measurement of the amount of liquid reduction, water was replenished up to the upper limit line (line B in FIG. 1: coincident with the electrolyte level at the start of the test) for one week (every 480 cycles). In addition, when the liquid level fell below the lower limit line (in FIG. 1, line A: coincides with the upper surface line of the strap 1) within one week, additional water replenishment was performed. The total water replenishment amount during 4320 cycles for each test battery was defined as the liquid reduction amount. Table 1 shows the measurement results of these liquid reduction amounts.

  From the results shown in Table 1, it can be seen that the battery of the example of the present invention has a remarkable effect of suppressing the amount of liquid reduction compared to the battery of the comparative example. In addition, the effect of the splash-proof plate is more pronounced in the battery of the present invention than in the battery of the comparative example, and a synergistic effect can be obtained by arranging both the splash-proof plate and the control valve portion. In the comparative example, the electrolyte mist and water vapor in the battery are relatively easily dissipated outside the battery due to vibration, and the amount of liquid reduction is increased.

  On the other hand, in the example of the present invention, the electrolyte mist and water vapor are prevented from escaping to the outside of the battery by the control valve unit. And since it recirculate | refluxs to the battery lower part, the very outstanding liquid reduction suppression effect can be acquired.

  As mentioned above, according to this invention, the liquid stopper provided with the valve structure and the lead acid battery provided with this can be provided more inexpensively, and it is suitable for the lead acid battery for starting.

The figure which shows the principal part cross section of the lead acid battery of this invention. Diagram showing the cross section of the control valve Assembly drawing showing each component of control valve The figure which shows the cross section of the control valve part of the lead acid battery by 3rd Embodiment. The figure which shows the principal part cross section of the lead acid battery by 4th Embodiment. The figure which shows the cross section of the control valve part of the lead acid battery by 5th Embodiment The figure which shows the principal part cross section of the lead acid battery by 6th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Strap 2 Packing 10 Lead acid battery 11 Liquid port 12 Vent hole 13 Liquid port plug 14 Lid 15 Battery case 16 Positive electrode plate 17 Negative electrode plate 18 Separator 19 Electrolyte 20 Main body cylinder 21 Control valve part 22 Exhaust hole 23 Bottom wall 24 Side wall 25 Valve Enclosure 25a Concave portion 26 Valve body 26a Valve plate 26b Elastic body 27 Presser plate 27a Notch 27b Convex convex portion 28 Vent 41 Control valve portion 42 Exhaust hole 43 Bottom wall 44 Side wall 45 Tube 46 Cap-shaped valve body 50 Lead Storage battery 51 Porous filter 61 Control valve portion 62 Porous filter 70 Lead storage battery 71 Splash-proof plate 72a, 72b, 72c Inclined splash-proof plate 73 Opening portion 74 Base portion 75 Column

Claims (7)

A lead storage battery in which a liquid port plug provided with a vent for discharging gas inside the battery to the outside of the battery is attached to the liquid port provided on the battery exterior, and the entire surface of the positive and negative electrode plates is immersed in the electrolyte. The vent plug is provided separately from the main body cylinder inside the main body cylinder of the liquid plug, and according to the battery internal pressure, the ventilation path is extended from the exhaust port provided at one end to the vent opening provided at the other end. A lead-acid battery comprising a control valve portion that is formed and has a valve opening pressure that is less than 10 kPa in contact with the inner diameter of the main body cylinder . A lead storage battery in which a liquid port plug provided with a vent for discharging gas inside the battery to the outside of the battery is attached to the liquid port provided on the battery exterior, and the entire surface of the positive and negative electrode plates is immersed in the electrolyte. The vent plug is provided separately from the main body cylinder inside the main body cylinder of the liquid plug, and according to the battery internal pressure, the ventilation path is extended from the exhaust port provided at one end to the vent opening provided at the other end. A control valve part to be formed is mounted, and the control valve part covers the exhaust hole in the valve housing body including a bottom wall having an exhaust hole and a side wall provided around the bottom wall. as a arranged valve body, disposed in said valve on the body, and lead-acid batteries you wherein a part thereof is made of a pressing plate joined to the side wall. The lead acid battery according to claim 2, wherein an elastic body is inserted between the valve body and the presser plate. A lead storage battery in which a liquid port plug provided with a vent for discharging gas inside the battery to the outside of the battery is attached to the liquid port provided on the battery exterior, and the entire surface of the positive and negative electrode plates is immersed in the electrolyte. The vent plug is provided separately from the main body cylinder inside the main body cylinder of the liquid plug, and according to the battery internal pressure, the ventilation path is extended from the exhaust port provided at one end to the vent opening provided at the other end. A control valve portion to be formed is mounted, and the control valve portion includes a bottom wall having an exhaust hole, a side wall provided around the bottom wall, and a direction in which the side wall protrudes from the exhaust hole opening. A projecting valve cylinder, a cap-shaped valve body mounted on the valve cylinder, and a presser plate that is disposed above the top surface of the cap-shaped valve body and part of which is joined to the side wall. lead-acid batteries you, characterized in that. The lead acid battery according to claim 1, wherein a porous filter having air permeability is disposed in a path between the vent hole and the control valve portion in the main body cylinder. The lead storage battery according to claim 2, wherein the pressing plate is made of a porous material having air permeability. The lead acid battery according to claim 1, wherein a splash-proof plate facing the exhaust hole is disposed in the main body cylinder.

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