JP2001085045A - Lead-acid battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lead-acid battery capable of preventing a positive electrode grating from short-circuiting to a negative electrode grating even under severe service conditions and assuring a prolonged lifetime. SOLUTION: Vertical ribs 1B connected with an upper frame rib 1A of a positive electrode grating confronting a tab 2D of a negative electrode grating are provided in a number one more than other vertical ribs 1B installed at a constant spacing. The upper frame rib 1A eventually severed is stopped by vertical ribs 1B, and the severed end of the upper frame rib 1A does not curve in the direction of the tab 2D of the negative electrode grating nor contact with the tab 2D or a negative electrode strap 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead-acid battery, and more particularly, to a positive electrode plate having a positive electrode grid coated with a positive electrode active material and a negative electrode plate having a negative electrode grid coated with a negative electrode active material with a separator interposed therebetween. Related to a lead-acid battery.

[0002]

2. Description of the Related Art Lead-acid batteries are excellent as a secondary battery power source in terms of price and reliability, and can obtain a large current. Therefore, lead-acid batteries have been used in a wide range of fields such as automobiles, electric vehicles, and stationary applications. It is used. In a lead-acid battery, generally, a positive electrode plate and a negative electrode plate are prepared by coating an active material on a lead alloy grid cast by a book mold method or a continuous casting method, and these two electrodes are separated through a separator for electrical insulation. An electrode group formed by stacking plates is formed.

[0003] In such a lattice body, an outer frame of the lattice body is provided, and lattices are arranged at substantially equal intervals vertically and horizontally in an outer frame bone having a predetermined mechanical strength. Of the grids, the positive grid used for the positive electrode plate generally has a higher temperature than the negative grid used for the negative electrode plate during charging and discharging, and tends to accumulate metal fatigue due to expansion and contraction or bend easily. Strength,
It has been designed while studying castability and electrical characteristics.

[0004]

However, in designing the outer frame bone, particularly the upper frame bone of the conventional positive electrode grid, consideration has been given to a reduction in mechanical strength due to corrosion of the positive electrode grid when a lead-acid battery is used. Therefore, when used under severe conditions such as high-temperature overload, there is a problem that short-circuit failure occurs and the life of the lead storage battery is extended.

[0005] That is, as shown in FIG. 3, under severe conditions at the time of high temperature overload of a lead storage battery, corrosion of the positive electrode grid body progresses due to a chemical reaction with dilute sulfuric acid as an electrolytic solution. The bone 11A is cut off, and the cut-off portion 1 of the upper frame bone 11A is cut.
When the tip of 1B and the negative electrode strap 5 and / or the negative electrode plate lug 2D opposed to each other with the separator 3 interposed therebetween, a short circuit occurs inside the lead storage battery and the life of the lead storage battery is extended. There was a point.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a lead-acid battery that can prevent a short circuit of a positive electrode grid to a negative electrode grid even under severe use conditions and can extend the life.

[0007]

In order to solve the above problems, the present invention provides a positive electrode plate having a positive electrode grid coated with a positive electrode active material and a negative electrode plate having a negative electrode grid coated with a negative electrode active material. In a lead-acid battery stacked with a separator interposed therebetween, the number of vertical lattice bones connected to the upper frame bone of the positive electrode grid body facing the ears of the negative electrode lattice body is increased. In the present invention, since the number of vertical lattice bones connected to the upper frame bone of the positive electrode lattice body facing the ears of the negative electrode lattice body is increased, corrosion of the positive electrode lattice body under severe conditions such as high temperature overload is caused. Even when the upper frame bone is cut, the cut end is fixed by the lattice vertical bone connected to the upper frame bone. For this reason, the cut end does not bend in the direction of the ear of the negative electrode grid, and a short circuit does not occur due to contact of the cut end with the ear of the negative electrode grid, so that the life of the lead storage battery can be extended. In order to reduce the weight of the lead storage battery, it is preferable that the number of vertical lattices be four.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a lead storage battery to which the present invention is applied will be described with reference to the drawings.

(Construction) The lead storage battery 10 of the present embodiment includes a rectangular battery case (not shown) serving as a container for the lead storage battery 10. The battery case is excellent in moldability, electrical insulation and durability. For example, acrylic butadiene styrene (AB
The material is a polymer resin such as S).

As shown in FIG. 1, a positive electrode plate 5 is provided in a battery case.
And six negative plates are laminated via a separator 3 made of a microporous polyethylene film. The positive electrode plate and the negative electrode plate are manufactured by applying a positive electrode active material or a negative electrode active material to both surfaces of a positive electrode grid and a negative electrode grid, respectively, which are formed by casting a lead alloy.

In the positive grid, vertical bones 1B and horizontal bones 1C are arranged in a grid at substantially equal intervals in an outer frame 1 serving as an outer frame of the positive grid. From the upper frame bone 1A constituting the upper portion of the outer frame bone 1, an ear portion 1D for extracting electricity collected by the positive electrode grid body extends upward. The ear 1D is connected to a positive electrode strap 4, and the positive electrode strap 4 is connected to an external positive electrode output terminal provided on a battery cover (not shown). The positive electrode strap 4 is held by a not-shown partition formed in the battery case. The positive electrode plate is held by a positive electrode strap 4 held by a partition (not shown). In addition, a plurality of legs 1E are formed on the bottom of the outer frame bone 1 so as to abut against the tip of a saddle (not shown) that stands from the bottom of the battery case. Therefore, the positive electrode plate is fixed in the battery case by the positive electrode strap 4 and the saddle tip. In addition, as shown in FIG. 1, the above structure is the same for the negative electrode grid body except for the position of the ear formed on the opposite side to the positive electrode grid and the negative electrode strap 5 connecting the ear. .

Further, a vertical bone (grid vertical bone) 1 connected to the upper frame bone 1A of the positive electrode grid body facing the ear 2D of the negative electrode grid body.
The number B of one or more (two in the case of FIG. 1) B is arranged more than other vertical bones 1B arranged at equal intervals. Therefore, the number of the vertical bones 1B connected to the upper frame bone 1A of the positive electrode lattice body facing the ears 2D of the negative electrode lattice body is three or more (four in the case of FIG. 1). Vertical bone 1
B is connected to the lower frame bone constituting the lower part of the outer frame bone 1 like the other vertical bone 1B. In addition, in the negative electrode lattice body, the vertical bone 1
B are all arranged at equal intervals.

In order to manufacture the lead-acid battery 10 of this embodiment, a positive electrode plate and a negative electrode plate are alternately laminated with a separator 3 interposed therebetween.
The ear 1D of the positive grid and the ear 2D of the negative grid
And inserted into the battery case. A battery lid is attached to the upper part of the battery case by welding or bonding, and an electrolytic solution is poured into the battery case from a liquid inlet, thereby producing an unformed battery. After the unformed battery is formed at a predetermined constant voltage and a constant current for a predetermined time, the liquid inlet is sealed with a liquid stopper to complete the lead storage battery 10. Note that dilute sulfuric acid having a specific gravity of 1.225 (20 ° C.) can be used as the electrolytic solution.

(Test) Next, according to the above-described embodiment, a positive electrode grid was formed with a thickness of 1.5 mm, a length of 115 mm, and a width of 144 m.
m, and the number of the vertical bones 1B connected to the upper frame bone 1A of the positive electrode grid body facing the ears 2D of the negative electrode grid body is 3 respectively.
55D23 of Examples 1 to 4 having four, five, and six tubes
An R-type lead storage battery was manufactured. Further, in order to confirm the effect of the lead storage battery of the embodiment, the thickness, length, and width of the positive grid were set to be the same as those of the battery of the embodiment, and the positive grid of the negative grid was opposed to the ear 2D of the negative grid. Longitudinal bone 1B connected to upper frame bone 1A
A lead-acid battery of a comparative example in which the number of the batteries was two (the same number as the conventional example shown in FIG. 3) was manufactured. A JIS light load life test was performed on the lead storage batteries of each of the examples and comparative examples at an ambient temperature of 75 ° C.

FIG. 2 shows test results of the light load life test.
In FIG. 2, the number of times of light load life of the battery of the comparative example is 10
The figure shows the number of light load life times of the lead storage battery of each embodiment when it is set to 0 (%).

As is apparent from FIG. 2, in the lead-acid battery of each embodiment, the number of the vertical bones 1B connected to the upper frame bone 1A of the positive grid body facing the ears 2D of the negative grid body is increased. Therefore, it can be seen that the life of the lead storage battery is improved even under severe conditions. In particular, in the lead storage batteries of Examples 2 to 4 in which the number of the vertical bones 1B is four or more, the number of light load life times is increased by 5 points as compared with the lead storage battery of the comparative example, and the vertical bones 1B
It can be seen that the effect of improving the service life due to the increase in the amount of the alloy has appeared.
In addition, since the number of life was substantially constant in the positive electrode grid body having four or more vertical bones 1B, in order to reduce the weight of the 55D23R type lead-acid battery, the positive electrode grid facing the ear 2D of the negative electrode grid body was required. It became clear that the number of the vertical bones 1B connected to the upper frame bone 1A of the lattice body is preferably four.

[0017]

As described above, according to the present invention, the number of lattice vertical bones connected to the upper frame bone of the positive electrode grid facing the ears of the negative electrode grid is increased, so that high-temperature overloading is achieved. Even if the upper frame bone is cut due to corrosion of the positive grid under severe conditions such as the above, the cut end is fixed by the grid vertical bone connected to the upper frame bone and curved in the ear direction of the negative grid. Since no short circuit occurs due to contact with the negative electrode grid ears without performing the above, the effect that the life of the lead storage battery can be extended can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a part of a positive electrode plate of a lead storage battery according to an embodiment to which the present invention is applied;

FIG. 2 shows test results of a light load life test when the number of bones is taken on the horizontal axis and the number of light load life times is taken on the vertical axis.

FIG. 3 is a cross-sectional view of a part of a positive electrode plate of a conventional lead-acid battery in which an upper frame bone has been cut away by corrosion and a short circuit has occurred.

[Explanation of symbols]

 Reference Signs List 1 outer frame bone 1A upper frame bone 1B vertical bone (lattice vertical bone) 1C horizontal bone 2D ear 3 separator 5 negative electrode strap 10 lead storage battery

Claims (2)

[Claims] 1. A lead-acid battery in which a positive electrode plate in which a positive electrode active material is coated on a positive electrode grid and a negative electrode plate in which a negative electrode active material is coated on a negative electrode grid are laminated with a separator interposed therebetween. A lead-acid battery, wherein the number of vertical lattice bones connected to the upper frame bone of the positive electrode lattice body facing the portion is increased. 2. The lead-acid battery according to claim 1, wherein the number of the lattice vertical bones is four.