JP2011146274A - Sealed type lead storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealed type lead storage battery allowing inward warping of both sidewalls to be corrected in a predetermined position without moving a correction plate from the predetermined position even with the mutually different sizes of inward warping of both sidewalls of a battery case occurring when storing an electrode plate group in a compressed state in the battery case in the sealed type lead storage battery. <P>SOLUTION: The sealed type lead storage battery is adapted to store the electrode plate group 1 formed by alternately laminating positive electrode plates 1a and negative electrode plates 1b through separators 1c, in the compressed state into the battery case A and to correct the inward warping of both sidewalls a3, a4 of the battery case A by the correction plate. A correcting member B includes a correction plate b1 and fixing members b2 protrusively provided at the lower face of the correction plate b1, and the fixing members b2 are engaged with the side face of a positive electrode strap 2a and the side face of a negative electrode strap 2b to fix the predetermined position of the correction plate b1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sealed lead-acid battery of a type in which a battery case containing a plate group and a lid are sealed by heat sealing.

As a conventional sealed lead-acid battery, sulfuric acid electrolysis impregnated in the electrode plate group by accommodating a group of electrode plates in which positive and negative electrode plates are alternately stacked via separators in a battery case at a predetermined group pressure By distributing the liquid evenly in the electrode plate group and absorbing oxygen at the negative electrode, long-term maintenance-free operation is possible, and it can be used for emergency backup power supplies such as communication equipment and uninterruptible power supplies. This is known in Patent Document 1 below.
However, when the electrode plate group is accommodated in the battery case in a compressed state, both side walls that are not subjected to compression of the electrode plate group of the battery case often warp inward. Focusing on the alignment between the edge and the lower end edge of the four edges of the lid applied thereto, that is, no alignment is obtained, and therefore there is a problem that a good heat seal of both of the four edge edges cannot be obtained, The applicant previously proposed a sealed lead-acid battery that solves this problem in Patent Document 2 below. The solution is to provide a correction member for correcting the inward warping of the both side walls of the battery case. More specifically, as is apparent from the embodiment of Patent Document 2 and the description of FIG. 1, the correction member 5 has a length that matches or is slightly shorter than the dimension between the inner surfaces of the side walls of the battery case. Is constructed on the upper surfaces of the positive strap and the negative strap, and both ends thereof are brought into contact with the inner surfaces of the both side walls, whereby the warpage thereof can be corrected easily and effectively. Can be easily aligned with each other, and the above-described conventional problems are solved.

Japanese Patent Laid-Open No. 10-334940 JP 2005-71663 A

However, when the electrode plate group is housed in a compressed state in the battery case, as shown in FIG. 3 of Patent Document 2, the degree of inward warping of the both side walls may be equal, but inequality may occur. Often occurs and, as illustrated in FIG. 5 of the present application, when the inner wall of one side wall is large and the inner wall of the other side wall is small, or vice versa, the correction member is It may be pushed and move in the direction of the side wall with a small inward warp, deviating from a predetermined position, and the original correction action may be lost, or the side wall with a small inward warp may be warped outward. It has been found that there is a problem that wall correction cannot always be performed reliably.
The present invention can ensure the correction of the inner warp of both side walls of the battery case that accommodates the electrode plate group in a compressed state, and can always ensure the consistency between the battery case and the lid. An object of the present invention is to provide a good sealed lead-acid battery.

According to the present invention, as described in claim 1, the electrode plate group in which the positive electrode plates and the negative electrode plates are alternately stacked via the separators is accommodated in a compressed state in the battery case, and the correction plate is disposed in the battery case. In a sealed lead-acid battery that corrects inward warping of both side walls, a fixing member is constituted by a fixing member projecting from the lower surface of the correction plate, and the fixing member is formed on the side surface of the positive electrode strap and the negative electrode strap. The sealed lead-acid battery is characterized in that a predetermined position of the correction plate is fixed by being engaged with the side surface of the battery.
Furthermore, the present invention provides the sealed lead-acid battery according to claim 1, wherein the straightening plate is a rectangular plate having a length suitable for passing the straightening member between the inner surfaces of the side walls of the battery case. The fixing members projecting from the left and right end portions of the lower surface, and the correction plate is placed on the upper surfaces of the positive strap and the negative strap, and the left and right fixing members respectively correspond to the fixing members. It is characterized by being engaged with the side surface of the positive electrode strap and the side surface of the negative electrode strap.
Furthermore, the present invention provides the sealed lead-acid battery according to claim 1, wherein the straight plate has a length suitable for passing the straightening member between the inner surfaces of both side walls of the battery case. And the fixing member having a thick wall protruding from the middle portion of the lower surface thereof, and the correction plate is placed on the upper surface of the positive strap and the negative strap, and the fixing member is mounted on the positive strap. And press contact engagement with the inner surfaces of the negative strap facing each other.
Furthermore, the present invention provides the sealed lead-acid battery according to claim 1, wherein the straightening member is configured as a pair of separate straightening members, and the straightening plate of each straightening member corresponds to the positive strap and the negative electrode. The strap is mounted on the upper surface of the strap so that the dimension between the outer ends of each correction plate matches the dimension between the inner surfaces of the both side walls of the battery case, and is fixed on the lower surface of each correction plate. The member is engaged with the corresponding outer side surface of the positive electrode strap and the outer side surface of the negative electrode strap.
Furthermore, the present invention provides the sealed lead-acid battery according to claim 4, wherein the ribs protruding horizontally from the lower ends of the respective fixing members protruding from the lower surfaces of the respective correction plates are respectively corresponding to the positive electrode straps. It faces the lower surface and the lower surface of the negative strap.

According to the inventions according to claims 1, 2, 3, and 4, the fixing member can improve the strength of the correction plate, while the fixing member is engaged with the positive strap and the negative strap. It can hold | maintain in the state fixed to the predetermined position, and, thereby, the correction of the internal curvature of the both-sides wall of this battery case can be obtained reliably. Accordingly, since alignment with the lid is always ensured, a sealed lead-acid battery by heat sealing can be obtained stably and satisfactorily.
According to the invention of claim 5, it is possible to prevent the correction plate from moving upward by the locking claws, and to ensure the inner warp correction of the both side walls at a predetermined position in a stable and robust manner.
Further, according to the invention of claim 4, the straightening plate on the positive strap and the straightening plate on the negative strap are brought into contact with the corresponding side walls at the predetermined positions by the respective fixing members. Each of the inner warp can be corrected, the upper plate of each correction plate is prevented from moving, and a stronger fixing effect is brought about.

It is a top view of the battery case which accommodated the electrode group before the cover which is a manufacturing process of one example of the embodiment in the sealed lead acid battery of the present invention in a compressed state. FIG. 2 is a longitudinal sectional view taken along line AA in FIG. FIG. 5 is a longitudinal sectional view of a part similar to FIG. 2 of another embodiment of the present invention, cut away. FIG. 4 (a) is a longitudinal sectional view of a part similar to FIG. 2 and FIG. 4 (b) is a side view seen from the direction indicated by the arrow BB. . It is a top view of the battery case which accommodated the electrode group before the cover in the conventional sealed lead acid battery was compressed.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 and FIG. 2 show an example of an embodiment of the present invention, FIG. 1 is a top view of a battery case of a sealed lead-acid battery before being sealed with a lid and heat sealed, FIG. FIG. 2 is a longitudinal sectional view taken along line AA in FIG.
1 and 2, reference numeral 1 denotes an electrode plate group accommodated in the battery case A in a compressed state. The electrode plate group 1 is formed by alternately stacking a predetermined number of positive electrode plates 1a, 1a,... And a predetermined number of negative electrode plates 1b, 1b,. The stacking direction is the vertical direction of FIG. 2a is a positive electrode strap connecting ears 1a1, 1a1,... Protruding to the left in the figure protruding to one side of all positive electrode plates 1a, 1a,..., 2b is one side of all negative electrode plates 1b, 1b,. In the figure protruding to the right, a negative strap provided by connecting ears 1b1, 1b1,... Protruding to the right side, 3a is a positive pole provided on the positive strap 2a, and 3b is a negative pole provided on the negative strap 2b.

According to the present invention, the correction member of the present invention having the following configuration is prepared. That is, as shown in FIGS. 1 and 2, the electrode plate group 1 accommodated in the battery case A in a compressed state is pressed with a predetermined group pressure to be orthogonal to the upper and lower opposing side walls a1 and a2. The correction plate b1 having substantially the same dimensions as the inner surfaces of the left and right side walls a3 and a4, and the left side of the correction plate b1 that protrudes downward from the left and right ends of the lower surface of the correction plate b1 and faces the positive strap 2a When inserted into the space space between the wall a3 and the space space between the negative electrode strap 2b and the right side wall a4 opposite to the negative electrode strap 2b, between the respective opposing surfaces, that is, the corresponding positive electrode strap 2a. A straightening member B comprising a fixing member b2, b2 having a square cross section having a width suitable for being sandwiched between the left side wall a3 and the negative electrode strap 2b and the right side wall a4. . Thus, the correction plate b1 of the correction member B is placed on the upper surface of the positive electrode strap 2a and the upper surface of the negative electrode strap 2b, and the right and left fixing members b2 and b2 are respectively placed in the left and right spaces. Since the right and left fixing members b2 and b2 are always engaged with the corresponding outer surfaces of the positive strap 2a and the negative strap 2b, respectively, by inserting them and holding them between their opposing faces, Even if the walls a3 and a4 have different warpage sizes, that is, the correction plate b1 is not pushed and moved to the left or right by the inner warping force caused by the side wall a3 or a4 having a large inner warp. Can always be fixed in place.
Further, since the straightening member B includes the fixing members b2 and b2 on the straightening plate b1, the strength is increased as compared with the conventional straightening plate b1, so that the inner warp of the side walls a3 and a4 is increased. Can be maintained firmly. Thus, the side walls a3 and a4 of the battery case A can always be maintained in a predetermined upright state before the electrode plate group 1 is accommodated.
Therefore, from this state, the four peripheral edges of the upper end of the opening of the battery case A are aligned with the lower four peripheral edges of the opposite lower end of the lid (not shown) applied thereto. Can be easily and reliably performed, and a good sealed lead-acid battery can be reliably obtained.

The straightening member B may be any material that is acid-resistant and electrically insulating, and may be any organic or inorganic material, but is generally made of various synthetic resins such as polypropylene, and is easy and inexpensive by molding. Is obtained.
Further, the correction plate b1 is generally an appropriately wide rectangular plate as shown in the figure, and this is positioned at the center in the length direction of the side walls a3, a4 of the battery case A. However, the present invention is not limited to this. The illustrated correction plate b1 has a length of 159 mm and a width of 65 mm, the thickness of the thin portion in the middle thereof is 3 mm, and the thickness of the thick portion including the fixing members b2 and b2 at the left and right ends thereof is 11 mm.

  As a means for fixing the position of the correction plate b1, a pair of rib-like fixing members b2 ′ and b2 ′ are projected from the lower surface of the correction plate b1 as shown by phantom lines, instead of the fixing means described above. The left fixing member b2 ′ may be engaged with the inner surface of the positive strap 2a, and the right fixing member b2 ′ may be engaged with the inner surface of the negative strap 2b. Further, a small protrusion (not shown) is formed that protrudes toward the straps 2a and 2b corresponding to the lower ends of the rib-like fixing members b2 ′ and b2 ′, and faces and engages with a part of the lower surface of each strap 2a and 2b. May be.

Further, the correction member B, which is a main part of the sealed lead-acid battery of the present invention, can be deformed as shown in FIG.
FIG. 3 is a partially cut side view similar to that shown in FIG. 2, but differs in the following points. That is, the correction plate b1 of the correction member B shown in FIG. 3 is the same as that shown in FIG. 1, but the positive and negative straps 2a, 2b are arranged in the middle portion of the lower surface of the correction plate b1 in the length direction. A correction member is prepared by projecting a fixing member b2 ″ having substantially the same dimensions as the space between them and having a desired thickness.
Thus, the correction plate b1 of the correction member B is placed on the upper surfaces of the positive and negative straps 2a and 2b, and the fixing member b2 ″ is used as a space between the positive strap 2a and the negative strap 2b. One end is engaged with the inner surface of the positive electrode strap 2a, and the other end is engaged with the negative electrode strap 2b, whereby the correction plate b1 is caused by a large warping force of either one of the side walls a3 and a4. Is pushed and moved, and is fixed at its predetermined position, so that the predetermined correction of the side walls a3 and a4 can be performed reliably.
The fixing member b2 ″ shown in the figure has a thickness that is substantially the same as that of the positive and negative straps 2a and 2b, and a width that is the same as the width of the correction plate b1, as a whole. However, the thickness and width of the straightening plate b1 are not limited to those described above.

FIG. 4 shows still another embodiment of the present invention, FIG. 4 (a) is a view similar to FIG. 2, and FIG. 4 (b) shows the arrow direction of the BB line in FIG. 4 (a). FIG. The straightening member shown in FIG. 4 is configured as separate straightening members B1 and B2 as follows. That is, a separate type correction that cuts the middle part of the correction plate b1 made of a long rectangular plate that passes between the inner surfaces of the side walls a3 and a4 of the battery case A in the previous two embodiment examples and separates it into the left and right. Fixing members b21 and b22 for engaging the outer surfaces of the positive and negative straps 2a and 2b with the respective correction plates b11 and b12 from the lower surfaces of the correction plates b11 and b12. The straightening members B1 and B2 are formed by projecting.
Thus, in the state where the outer ends of the respective correction plates b11, b12 of the one of the correction members B1, B2 are in contact with the inner surfaces of the side walls a3, a4 of the battery case A, the corresponding positive electrode straps 2a, The respective correction members on both sides are mounted by being respectively placed on the upper surface of the negative electrode strap 2b and press-fitting the fixing members b21 and b22 to the outer surface of the corresponding positive electrode strap 2a and the outer surface of the negative electrode strap 2b. The dimension between both end faces of the respective correction plates b11 and b12 of the members B1 and B2 is the same as that between the inner faces of the both side faces a3 and a4 of the battery case A, and the upper surface of the positive strap 2a and The negative electrode strap 2b is fixed at a predetermined position on the upper surface. Therefore, the correction of the opposing side wall a3 can be ensured by the correction plate b11 of the correction member B1, and the correction of the corresponding side wall a4 can be ensured by the correction plate b12 of the correction member B2. Thus, alignment with the lid is obtained with respect to the corrected battery case, and therefore good heat sealing of both can be easily and reliably performed.

  In these example embodiments, these desired corrective members are placed on the positive strap and the negative strap before the electrode plate group is accommodated in the battery case, and each corrective member is placed by hand or with a desired instrument. The electrode plate group may be accommodated in the battery case in a compressed state while being pressed from above, and the inner warp of both side walls may be corrected simultaneously with the accommodation, or the electrode plate group is accommodated in the battery case. After that, the both side walls of the battery case that are warped are pushed outwards by hand, and a desired correction member is installed on the positive strap and the negative strap so as to correct the inner warp of the both side walls. It may be.

In the embodiment shown in FIG. 4, the fixing members b21 and b22 are formed in a rib shape, and the ribs c1 and c2 projecting horizontally from the lower surfaces of the fixing members b21 and b22 are respectively connected to the lower surface of the positive strap 2a and the It faces the lower surface of the negative strap 2b, thereby preventing the corrective plates b11 and b12 from moving upward, and fixing the corrective plates b11 and b12 of the right and left corrective members B1 and B2 in place. Can be.
Thus, as shown in FIGS. 4 (a) and 4 (b), the horizontal ribs C1 and C2 are generally formed in a comb shape inserted between the ears.
Each of the horizontal ribs C1 and C2 is formed to have the same width as that of the lower surface of the positive strap 2a and the negative strap 2b in FIG. 4 (a), but faces one part of the lower surface. Needless to say, the upward movement of the correction plates b11 and b12 can be prevented.

  In the above, an embodiment of the present invention has been described for a sealed lead-acid battery comprising one cell in which a plate group is housed in a battery case, and a positive pole and a negative pole are provided on each positive and negative strap. Of course, the present invention can also be applied to a sealed lead-acid battery in which electrode plates are accommodated in a plurality of cell chambers formed by at least one partition wall in the battery case.

1 plate group
1a Positive electrode plate
1a1 Ear of positive plate
1b Negative electrode plate
1b1 Negative electrode ear
1c separator
2a Positive strap
2b Negative strap
A battery case
a1, a2, a3, a4 Side wall of battery case
B, B1, B2 Straightening material
b1, b11, b22 Straightening plate
b2, b2 ′, b2 ″, b21, b22 Fixing member
c1, c2 horizontal rib

Claims (5)

  An electrode plate group formed by alternately laminating positive and negative electrode plates through separators is housed in a compressed state in a battery case, and the correction plate is sealed so as to correct the warpage of both side walls of the battery case. In the lead-acid battery, a correction member is constituted by a fixing member protruding from the lower surface of the correction plate, and the fixing member is engaged with a side surface of the positive electrode strap and a side surface of the negative electrode strap so that a predetermined position of the correction plate is obtained. A sealed lead-acid battery characterized by fixing the battery.   The straightening plate of a rectangular plate having a length dimension suitable for passing the straightening member between the inner surfaces of the both side walls of the battery case, and the fixing member protruding from the left and right end portions of the lower surface thereof And the corrector plate is placed on the upper surfaces of the positive strap and the negative strap, and the fixing members on the left and right sides are engaged with the corresponding side surfaces of the positive strap and the negative strap, respectively. 2. The sealed lead-acid battery according to claim 1, wherein   The straightening plate in a rectangular plate shape having a length suitable for passing the straightening member between the inner surfaces of the both side walls of the battery case, and the thick fixing member projecting from an intermediate portion of the lower surface The correction plate is placed on the upper surfaces of the positive strap and the negative strap, and the fixing member is press-fitted to the opposing inner side surfaces of the positive strap and the negative strap. 2. The sealed lead-acid battery according to claim 1.   The straightening member is configured as a pair of separate straightening members, and the dimension between the outer ends of the straightening plates on the upper surface of the positive strap and the negative strap corresponding to the straightening plate of each straightening member is the electric current. It is placed so as to coincide with the dimensions between the inner surfaces of the both side walls of the tank, and the fixing members protruding from the lower surfaces of the respective correction plates are respectively attached to the outer surfaces of the corresponding positive electrode straps and the outer surfaces of the negative electrode straps. 2. The sealed lead-acid battery according to claim 1, wherein the sealed lead-acid battery is engaged with a side surface.   The rib projecting horizontally from the lower end of each fixing member projecting from the lower surface of each correction plate faces the lower surface of the corresponding positive electrode strap and the lower surface of the negative electrode strap, respectively. Item 5. The sealed lead-acid battery according to item 4.

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