JP2003297414A - Lead acid storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lead acid storage battery structured so that a group of a positive plate and a negative plate is inserted in a battery jar and the legs of the positive and negative plates are placed on a saddle formed on the bottom surface of the jar and arranged as serviceable in good stability in the sideways tumbled attitude. <P>SOLUTION: The positive plate P of this lead acid storage battery has a porous base board 3 furnished with an outer frame rib 3b having a lower frame rib 3b1, and saddle engaging extension parts 2b1-are provided consolidatedly on both sides of the saddle placing undersurface 2a of a leg 2 protruded rigidly from the lower frame rib 3b1, wherein it is arranged so that the left and right extension parts 2b1--of the leg 2 of the positive plate P confront opposingly to the two side faces of the saddle 1b of the battery jar 1 when the leg 2 is placed on the saddle 1b. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a lead storage battery.

[0002]

2. Description of the Related Art As a conventional lead-acid battery, an electrode group is compressed and housed in a battery case with a predetermined pressing force in the stack thickness direction of the electrode plate, and a saddle disposed on the bottom surface of the battery case is used. It is well known that the extension absorption type foot of the positive electrode plate and the foot of the negative electrode plate, which constitute the electrode plate group, are placed and housed respectively.

[0003]

However, since the conventional lead-acid battery of this type is mounted on the saddle by the flat saddle-mounting lower surface of the stretch-absorption type foot of the positive electrode plate, If the pressing force on the electrode plate group is relatively small and the lead storage battery is laid down sideways with the side end surfaces of the electrode plate facing up and down, the legs of the positive electrode plate should absorb the elongation. Since the strength is relatively weak, it falls off from the saddle, and as a result, stress is applied to the ear that supports the upper end of the electrode plate and the strap that connects them, the part breaks or corrosion is accelerated by stress corrosion. Therefore, there is an inconvenience such as breakage and other troubles, and there is a dislike that it cannot be used stably and satisfactorily in a horizontal state. Therefore, it is desired to solve the above-mentioned conventional problems and to develop a lead storage battery that can be reliably and stably used even when placed horizontally.

[0004]

SUMMARY OF THE INVENTION The present invention provides a lead-acid battery that solves the above-mentioned problems of the prior art, and is a lead-acid battery in which the legs of an electrode plate are placed on a saddle provided on the bottom of a battery case. In the above, there are provided electrode plates on both sides of the saddle-mounting lower surface of the foot, which are integrally projecting downwardly and are provided with saddle-engaging extension portions facing both side surfaces of the saddle. . Furthermore, the present invention, in the above invention that solves the above problems, favorably absorbs the elongation of the positive electrode plate that occurs during repeated use of the lead storage battery, prevents short circuits, and lifts the pole terminal. It also provides a long-life lead-acid battery that can prevent the occurrence of abnormalities such as external leakage of electrolyte solution by causing cracks in the sealing adhesive filled around the terminals, and is provided on the bottom of the battery case. A horizontal frame to be mounted on the saddle and a downward frame of the porous frame filled with the positive electrode active material and integrally extend downward to support the horizontal frame from both sides by integrally connecting both ends of the horizontal frame. A positive electrode plate having left and right supporting bones and having legs formed by forming lower end portions of the left and right supporting bones into saddle locking extension portions extending below the saddle-mounting lower surface of the lateral bones. It is characterized by Furthermore, the present invention is the lead-acid battery provided with the above positive electrode plate, wherein the left and right supporting bones of the positive electrode plate extend obliquely with respect to the lower frame bone of the porous substrate, and the distance between them gradually increases as they extend. In addition to being formed on the supporting bone in the open leg state, the transverse bone is thin or thin so that it can be extended and broken by tensile stress due to the supporting bones on both sides as the positive electrode plate extends. Furthermore, the present invention provides a lead-acid battery comprising the above positive electrode plate, wherein the left and right supporting bones of the positive electrode plate are formed into pendulum bones that extend at right angles to and parallel to the lower frame bones of the porous substrate, The transverse bone is
It is characterized in that it has a thin or thin diameter that can be bent downward around the saddle as the positive electrode plate expands.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a lead storage battery A in which a part of one embodiment of the present invention is cut. The lead-acid battery A accommodates in its battery case 1 an electrode plate group B in which positive electrode plates P and negative electrode plates are alternately laminated with separators S interposed between them. The left and right feet of the plate are mounted on saddles arranged on the bottom surface of the battery case 1. The positive electrode plate P includes a porous substrate 3, in the illustrated example, a cast grid substrate 3 of a lead alloy selected from, for example, Pb—Ca—Sn alloy and various other lead alloys, and a crosspiece that crosses the positive electrode active material p vertically and horizontally. Is formed by filling the space between the inner lattices 3a of
The outer frame bone 3b surrounding four is provided with the lower frame bone 3b1 and the left and right legs 2 and 2 which integrally project from the lower frame bone 3b1. Reference numeral 4 denotes an ear which integrally projects from the upper frame bone 3b2 of the outer frame bone 3b.
Is a strap for connecting the ear row, 6 is a positive pole pillar that protrudes upward from the strap 5 through the lid 7 in an airtight manner, and 8 is the battery case 1 and the lid 7 applied to the battery case 1. An adhesive for sealing the space is shown. The negative electrode plate is hidden by the separator S and is not visible in FIG. 1, but its configuration is the same as that of the positive electrode plate except that the active material filled in the cast lattice substrate is the negative electrode active material. 9 shows a negative pole. The electrode group B is impregnated with a predetermined amount of the electrolytic solution. The structure of the above lead acid battery is the same as the conventional one. The legs of the conventional positive electrode plate are designed to absorb the elongation of the positive electrode plate during use.
As shown in FIG. 3 of Japanese Patent No. 9163 and FIG. 1 and FIG. 4 of Japanese Utility Model Laid-Open No. 1-134359, the saddle-mounting lower surface is formed as a flat surface stretch-absorbing foot over its entire width. As for the legs of the negative electrode plate, since the saddle-mounting lower surface shown in FIG. 1 of Japanese Utility Model Publication No. 58-159163 is formed into a flat plate member over the entire width, the group pressure of the electrode plate group is insufficient. It was found that when such a lead-acid battery was placed horizontally, the legs fell off the saddle and fell into the extension of the electrode plate, which is not suitable for horizontal placement. In order to eliminate such inconvenience, a first object of the present invention is to integrate the legs of at least one of the positive electrode plate and the negative electrode plate as an electrode plate on both sides of the saddle mounting lower surface. An object of the present invention is to provide a lead storage battery having a lead storage battery electrode plate that is provided with a saddle engaging extension that projects downward and faces both side surfaces of the saddle when mounted on a saddle.

1 to 6 show an example in which the present invention is applied to a positive electrode plate, and FIG. 7 shows a case where the present invention is applied to a negative electrode plate. 1 to 6, the left and right legs 2 and 2 of the positive electrode plate P
Are configured as follows, respectively. That is, the foot 2 is provided by being cast integrally with the lower frame bone 3b1 using the same lead alloy material after casting the grid substrate 3, but its form is the bottom surface of the battery case 1. A horizontally extending transverse bone 2 for mounting on a saddle 1b which is integrally formed with the saddle 1a.
a and left and right support bones 2b, 2b that extend downwardly from the lower frame 3b1 of the lattice substrate 3 and are integrally connected to both ends of the horizontal bone 2a to support the horizontal bone 2a from the left and right, A saddle member that forms a space surrounded by the lateral bone 2a and the left and right supporting bones 2b, 2b, and extends the lower ends of the left and right supporting bones 2b, 2b below the saddle-mounting lower surface 2a1 of the lateral bone 2a. It has a characteristic form formed in the stop extension portions 2b1 and 2b1. Thus, as shown in FIG. 1, the positive electrode plate P is housed in the battery case at a predetermined pressure, and the legs 2 and 2 of the positive electrode plate P are saddleed at the center of the transverse bones 2a and 2a. When mounting on the corresponding saddles 1b, 1b of the battery case 1 on the mounting lower surface 2a1, the saddle engaging extensions 2b1, 2b1 of the left and right supporting bones 2b, 2b are located on the saddle 1b. It will be facing both side surfaces. In the illustrated example, in this state, the space between the saddle 1b and the saddle engaging extensions 2b1 and 2b1 of the supporting bones 2b and 2b on both sides thereof is, for example, about 4 mm.
And Therefore, even if the lead storage battery A having the positive electrode plate P of the present invention having the foot 2 is used by laying it down on the left side or the right side, the positive electrode plate P is used for the saddle locking of the foot 2. Since either one of the extension portions 2b1 and 2b1 engages with the side surface of the saddle 1b, the foot of the conventional positive electrode plate slips off the saddle,
It is possible to solve the above-described conventional problems that occur when the positive electrode plate falls and tilts on the lower end side, and to ensure stable and favorable use in a horizontal position.

A second object of the present invention is to provide the positive electrode plate P
Feet 2 of the present invention, in addition to providing the above-described actions and effects, provides a lead storage battery that absorbs the elongation of the positive electrode plate P that occurs during use of the lead storage battery A and solves the above problems. As an example, it is preferable to configure as follows. That is, the left and right support bones 2b, 2b of the positive electrode plate P extend obliquely with respect to the lower frame bone 3b1 of the lattice substrate 3 and the distance between the support bones 2b in the open-leg state gradually increases as they extend. 2b, and the transverse ribs 2a are made thin or thin so that they can be stretched and broken as the positive electrode plate P is stretched. In the illustrated example, the thickness of the left and right supporting bones 2b, 2b is the same as the lower frame bone 3
The thickness is the same as that of b1, for example, the thickness is 3 mm and the cross-sectional shape is a regular hexagon, but the thickness and the cross-sectional shape are not limited to this. On the other hand, in the illustrated example, the transverse bone 2a has a thickness in the up-down direction of, for example, a thickness of about 2 mm, and has a flat hexagonal plate shape in the transverse cross-section, but is not limited to this. . For example, a rod-shaped member having such a small diameter may be used. In general, the thickness of the lateral bone 2a is preferably 70 to 40% of the thickness of the support bone 2b. Further, the inclination angle θ with respect to each of the left and right inclined support bones 2b with respect to the lower frame bone 3b1 is preferably in the range of 60 to 80 ° to allow the elongation of the lateral bone 2a described later, and in the illustrated example, it is 75 °. Is. The height of the saddle 1a in the figure is 5 m.
m, the height space from the extension of the left and right support bones 2b, 2b to the bottom of the battery case 1 was 3 mm, and the height from the lower surface of the lower frame bone 3b1 to the extension of the support bone 2b was 19 mm.

As described above, the foot 2 of the positive electrode plate P has the above-mentioned form, and therefore has the following action. That is, when the surface of the lattice substrate 3a of the positive electrode plate P expands during use of the lead storage battery, the lattice substrate 3a expands in the vertical direction due to the volume expansion pressure, and the compressive stress from above and below the lattice substrate 3a. However, since the lateral bone 2a placed on the saddle 1b has a space above it, the lateral bone 2a can be easily bent and extended to absorb the extension of the positive electrode plate P. Finally, although the lower ends of the supporting bones 2b and 2b come into contact with the bottom surface 1a of the battery case 1, since the supporting bones 2b and 2b are in an open-legged state, they are connected according to their extension. The tensile stress is applied from both sides to the running lateral rib 2a, allowing the lateral rib 2a to expand, and the elongation of the positive electrode plate P can be further absorbed. With the subsequent extension of the positive electrode plate P, the lateral bones 2a are allowed by the V-shaped support bones 2b and 2b, and are continuously stretched by receiving tensile stress, and the extension of the positive electrode plate is absorbed accordingly. Finally, as in the positive electrode plate shown in FIG. 3, the transverse bone 2a is broken by the tensile force of the supporting bones 2b and 2b, and the lower frame bone 3b of the positive electrode plate P is attached to the top of the saddle 1b.
It contacts the lower surface of No. 1 and receives pressure from above and below to open the legs, and the extension of the positive electrode plate P can be absorbed maximally.

FIG. 4 shows a modified example of the foot 2'of the positive electrode plate P. The left and right supporting bones 2b, 2b have the same thickness as the lower frame bone 2b1 and a rectangular cross section, and the supporting bones 2b, 2b. Between the upper ends of the two, the legs are branched into two legs that intersect each other without any gap. The lateral bone 2a is made of a thin plate which is thin in the vertical direction and has the same thickness as the supporting bones 2b, 2b and a rectangular cross section.
The effect is the same as the foot 2 of the previous embodiment.

FIG. 5 shows another embodiment of the legs of the positive electrode plate P. The legs 2 ″ are the support bones 2b, 2b on the left and right of the positive electrode plate P.
Is formed in a pendulum that extends at right angles to and parallel to the lower frame bone 3b1 of the lattice substrate 3b. The transverse bone 2a supported by both pendulum support bones 2b and 2b extends the extension of the positive electrode plate. Along with the saddle 1b, the saddle 1b is formed so as to be thin and thin so that it can be bent downward. The lower ends of the left and right hanging support bones 2b, 2b are the saddle-mounting lower surface 2a of the transverse bone 2a.
Saddle engaging extension 2b projecting an appropriate length below 1
Although it is the same as in the previous embodiment, it is formed to have 1, 2b1. However, the space between the pendant supporting bones 2b, 2b is made narrower than that in the previous embodiment, and the bottom surface 1a of the battery case 1 is formed. When the transverse bone 2a of the foot 2 ″ is placed on the saddle 1b with the saddle-mounting lower surface 2a1, both side surfaces of the saddle 1b and saddle-engaging extension portions 2b1 and 2b1 facing each other on both sides thereof are formed. When the lead storage battery is used laterally, the saddle 1 of the saddle locking extension 2b1 of one of the saddles is used.
The engagement with the side surface of b is obtained more quickly, and the fall prevention on the extension side of the positive electrode plate P can be obtained more quickly. In addition, the supporting bones 2b, 2b that support the horizontal bone 2a are formed by a thick quadrangular prism, the horizontal bone 2a is formed by a plate having a rectangular cross-section that is thinner than that in the previous embodiment, and the positive electrode plate P corresponds to elongation. The transverse bone 2a is bent downward on both sides of the saddle 1b as shown in FIG. 6, and the positive electrode plate is extended until the lower ends of the pendulum bones 2b, 2b on both sides reach the bottom surface 1a of the battery case 1. I tried to absorb it.

Since the negative electrode plate does not expand during use of the lead storage battery, the lower frame bone 3b1 of the grid plate is cast during the casting of the grid substrate.
A simple plate-shaped conventional foot 2b 'having a flat lower surface for saddle mounting as shown in a simple rectangular shape or a trapezoidal shape protruding downward.
In general, a pair of right and left are cast, and a negative electrode plate obtained by filling the negative electrode active material n with the positive electrode plate P of the present invention is assembled into an electrode plate group and housed in the battery case 1. The lead storage battery of the present invention may be constructed by mounting the saddle-mounting lower surface 2a1 of the foot 2b 'on the corresponding saddles 1b, 1b on the bottom surface of the battery case 1, but preferably the negative electrode plate N is used. The conventional foot 2b 'is used as a basic shape, and when the grid substrate is cast, as shown in FIG. 7, like the foot of the positive electrode plate of the present invention, the conventional foot 2b' has a saddle-mounting lower surface 2a1. Saddle engaging extensions 2b1 'and 2b1' are provided on both sides of the foot 2A to extend the legs 2A by casting, and the negative electrode plate N having the feet 2A is stretched and absorbed according to the present invention. The assembled positive electrode plate B including the positive electrode plate 2 of the mold is compressed and housed in the battery case 1, and FIG. As described above, the left and right feet 2A of the negative electrode plate N are placed on the corresponding saddles 1b by the saddle-mounting lower surface 2a1, and the saddle engaging extensions 2b1 ', 2b1' on both sides of the saddle 1b are attached to the saddle 1b. I made it face both sides. Thus, the positive and negative electrode plates P and N provided with the feet 2 and 2A of the present invention are used together to assemble the electrode plate group B, which is assembled in the battery case 1
A lead storage battery manufactured by being placed on the bottom plates 1b, 1b, ... Can be obtained, and a stable lead storage battery can be provided even when the lead storage battery is used horizontally.

As shown in FIG. 7, the space between the saddle engaging extensions 2b1 'and 2b1' on both sides of the foot 2A is such that when the saddle mounting lower surface 2a1 is mounted on the saddle 1b, Saddle 1
It is preferable that both side surfaces of b be formed in a fitting space that engages with the saddle engaging extensions 2b1 ', 2b1'. In this case, the facing surfaces of the saddle locking extension portions 2b1 ', 2b1' on both sides forming the fitting space are tapered slant surfaces whose width increases as they reach the lower end. It is preferable that 1b can be easily fitted in the fitting space. Further, it is needless to say that the same foot shape as the foot of the positive electrode plate may be applied to the negative electrode plate.

[0013]

EXAMPLES Next, examples of the present invention will be described in detail together with comparative examples. A group of electrode plates assembled by alternately stacking 30 positive electrode plates of the present invention shown in FIG. 2 and 31 negative electrode plates having trapezoidal conventional legs having a flat bottom surface for saddle mounting with separators interposed therebetween. Is housed and inserted into the battery case between the opposing walls by a predetermined pressing force, and the legs of the positive and negative electrode plates are placed and stored on the corresponding saddles arranged on the bottom surface of the battery case. After that, the following was performed in a usual manner by injecting and impregnating a predetermined amount of dilute sulfuric acid electrolytic solution into the electrode plate group, and hermetically sealing the battery lid with a nominal capacity of 2V50
A large number of 0 Ah lead-acid batteries were manufactured. On the other hand, for comparison,
As a positive electrode plate having a conventional stretch-absorption type foot with a flat bottom surface for saddle mounting, as shown in FIG. 4 of Japanese Utility Model Laid-Open No. 1-134359, left and right thick edge portions and a saddle mounting in the middle thereof. In the battery case, an electrode plate group was assembled by alternately stacking 30 positive electrode plates having legs made of thin plate portions and 31 negative electrode plates having the same trapezoidal conventional legs as described above with separators in between. After inserting it between the opposing walls with a predetermined compression force and placing it on the saddle arranged on the bottom of the battery case, inject the predetermined amount of dilute sulfuric acid electrolytic solution into the electrode plate group in the following manner. A large number of conventional lead-acid batteries having a nominal capacity of 2V500Ah, which are impregnated and hermetically covered with a battery lid, were manufactured. Each of these 12 lead-acid batteries of the present invention and 12 conventional lead-acid batteries had a voltage of 2.
A trickle life test in which the battery was charged at 3 V for 12 months was performed to check for the presence of a short circuit, the battery terminals, and the appearance abnormalities around the terminals and the battery case. The results are shown in Table 1 below.

[0014]

[Table 1]

In the conventional lead-acid battery, the expansion of the positive electrode plate is not sufficiently absorbed by the foot, so that the positive electrode plate rises and short-circuits with the negative electrode plate, or due to the stress due to the expansion of the positive electrode plate, The adhesive filled around the positive electrode terminal was cracked, and the electrolyte leaked from this portion, and the battery case was expanded and damaged. On the other hand, all of the lead-acid batteries of the present invention sufficiently absorbed the elongation of the positive electrode plate. No abnormality occurred.

[0016]

As is apparent from the above, according to the invention of claim 1, even if the lead storage battery is laid down sideways, the legs of the electrode plate will be displaced from the saddle of the battery case and the extension portion will fall. Prevents horizontal use. According to the invention according to claims 2 to 4, the positive electrode plate has the effect of preventing falling from the saddle,
It absorbs the elongation of the electrode plate sufficiently and satisfactorily, prevents short circuits and abnormalities around the positive electrode terminal, and extends the service life.

[Brief description of drawings]

FIG. 1 is a front view in which a part of a lead storage battery including a positive electrode plate according to an embodiment of the present invention is cut away.

FIG. 2 is an enlarged front view of a foot portion of the positive electrode plate of the present invention.

FIG. 3 is an enlarged front view showing an operating state of the positive electrode plate shown in FIG.

FIG. 4 is an enlarged front view of a foot portion of a positive electrode plate according to a modified example of the present invention.

FIG. 5 is an enlarged front view of a foot portion of a positive electrode plate according to still another embodiment of the present invention.

FIG. 6 is an enlarged front view showing an operating state of the positive electrode plate shown in FIG.

FIG. 7 is an enlarged front view of a foot portion of a negative electrode plate according to still another embodiment of the present invention.

[Explanation of symbols]

A lead acid battery B electrode plate group P positive plate N negative plate 1 battery case 1a Bottom of battery case 1b saddle 2,2 ', 2 ", 2A feet 2a horizontal bone 2a1 Saddle mounting bottom surface 2b Support bone 2b 'Conventional foot 2b1, 2b1 'saddle engaging extension 3 Porous substrate, cast lattice substrate 3b outer frame 3b1 Lower frame bone

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toru Mangahara             Fukushima Prefecture Iwaki City Joban Shimo-Funao Pile 23-6               Furukawa Battery Co., Ltd., Iwaki Plant F-term (reference) 5H028 AA08 CC08 CC24 HH05                 5H050 AA15 BA09 DA02 DA17 HA12

Claims (4)

[Claims] 1. A lead-acid battery in which a foot of an electrode plate is placed on a saddle disposed on the bottom of a battery case, and both sides of the saddle are integrally projecting downward on both sides of a saddle-mounting lower surface of the foot. A lead-acid battery comprising a pole plate provided with a saddle engaging extension facing the surface. 2. A horizontal frame for mounting on a saddle disposed on the bottom surface of the battery case and a lower frame of the porous substrate filled with the positive electrode active material, and extends downward integrally with the horizontal frame. And left and right supporting bones that support the lateral bones from the left and right, and the lower end portions of the left and right supporting bones are provided as saddle locking extension portions that extend downward from the saddle mounting lower surface of the lateral bones. The lead acid battery according to claim 1, further comprising a positive electrode plate having formed legs. 3. The left and right supporting bones of the positive electrode plate are formed in the supporting bones in an open-leg state in which the supporting bones extend obliquely with respect to the lower frame of the porous substrate and the distance between them gradually increases as they extend. The lead acid battery according to claim 2, wherein the transverse bone is thin or thin so that it can be stretched and ruptured by tensile stress due to the supporting bones on both sides as the positive electrode plate extends. 4. The left and right supporting bones of the positive electrode plate are formed as pendulum bones that extend at right angles to and parallel to the lower frame bones of the porous substrate, and the transverse bones extend the extension of the positive electrode plate. The lead-acid battery according to claim 2, wherein the lead-acid battery is thin or thin so that it can be bent downward around the saddle.