JP5092183B2 - Lead acid battery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lead-acid battery having an expanded lattice.
[0002]
[Prior art]
In the conventional expanded positive and negative grids, the width of the node and the step width of the crosspieces are the same throughout the grid, even though there are differences in the manufacturing methods such as rotary and reciprocating. The volume of is the same in all node parts except the first node part coming out from the upper and lower forehead, and the first node part coming out from the upper and lower part is only half. The volume was half that of the other nodes.
[0003]
[Problems to be solved by the invention]
When the node width of the expanded lattice and the step width of the crosspiece are reduced, the mass density of the expanded lattice is reduced, and the mass of the entire battery can be reduced.
[0004]
However, in the conventional expanded lattice, the mechanical strength against stress, vibration, etc. applied at the time of expanding is weakened, and there is a case where a cross break occurs during the manufacturing process or a cross break occurs due to corrosion caused by battery use. .
[0005]
An object of the present invention is to solve such a problem in the strength of the expanded lattice and to realize a lighter battery.
[0006]
[Means for solving the problems]
The first invention of the present application is provided with an expanded lattice subjected to an expanding process by a rotary method as a positive electrode lattice or a negative electrode lattice, and the expanded lattice extends in a predetermined direction and extends in the one direction. A lower forehead disposed opposite to the upper forehead and a lattice portion connecting the upper forehead and the lower forehead, the lattice portion extending in the one direction, It does not have a forehead connecting at least two or more node parts, and the volume of the first node part from each of the upper and lower foreheads of the expanded lattice is the second node part. is a lead-acid battery of the Turkey is greater than 0.5 times the volume of said.
[0007]
By making the volume of the first node part larger than 0.5 times the volume of the second node part, the mechanical strength and corrosion resistance of the first node part are increased, and the It becomes possible to prevent the crossing of the cross and the use of batteries, and even if the node width of the other part of the expanded lattice and the step size of the cross are reduced, the substantial strength of the expanded lattice can be maintained. Weight reduction of the lead storage battery by weight reduction is realizable. Preferably, the volume of the first node part is 0.7 to 1 times the volume of the second node part.
[0008]
Further in the first invention, the thickness of the crosspiece is stepwise or continuously changes brought toward its et Kisupando development central, stepwise or continuously grid density brought toward its et Kisupando development central portion It shall be the features and Turkey have is reduced.
[0009]
According to this structure, it is possible to reduce the weight of the expanded lattice without reducing the substantial mechanical strength, and it is possible to reduce the weight of the lead storage battery. This is because the stress caused by the vibration exerted on the crosspiece and the node portion becomes smaller toward the center of the expanded deployment, so that the mechanical strength as a whole is reduced even if the lattice density is reduced toward this direction. This is because it can be maintained.
[0010]
Moreover , you may provide the expanded grating | lattice in which the crosspieces of different thickness are formed alternately as a positive electrode grating | lattice or a negative electrode grating | lattice (1st structure).
[0011]
According to this structure, it is possible to reduce the weight of the expanded lattice while suppressing a decrease in mechanical strength over the entire lattice, and it is possible to reduce the weight of the lead storage battery. This is because the thin portion can compensate for the decrease in strength in the thin portion.
[0012]
Also, further in upper Symbol second invention or the first structure, the volume of one place th node portion emanating from the top value or bottom value of the expanded grid, nodes of the two locations th volume 0. 5 times greater than going on way to lever, more excellent in mechanical strength, lightweight, it can provide a better cell in corrosion resistance (second structure).
[0013]
In the first, second, first, or second structures of the present application, the derived angle from the node portion of the beam differs depending on the thickness of the beam, and the derived angle of the thin beam is smaller than the derived angle of the thick beam. Then, in addition to the above, by further reducing the derived angle of the thin beam to be smaller than the derived angle of the thick beam, the distortion at the time of expanding can be reduced (third structure) .
[0014]
Further, the present first and second invention, Oite to the first and second or third structure, to lever as derived angle crosspiece is in the 30-45 °, further to the above, the expanded deployment By suppressing the tensile stress applied to the crosspieces at times, damage can be suppressed particularly in the case of an expanded lattice made of lead or a lead alloy (fourth structure) .
[0015]
Further , in the first, second , second, third, or fourth structures of the present application, in the expanded lattice, all nodes except for the first node portion extending from the upper or lower forehead of the lattice in part, which be such a ratio between a value obtained by adding the two bars of the step size derived from the value and the node portion of the width of the node portion (a) in the vertical (b11, b22) is kept constant For example, in addition to the above, it is easy to reduce the derived angle, so that the lattice strength and productivity can be improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail with reference to embodiments.
[0017]
FIG. 1 is a schematic plan view showing the structure of an expanded lattice used in a lead storage battery according to an embodiment of the first invention of the present application.
[0018]
The expanded lattice can be produced, for example, by subjecting a casting of a Pb—Ca—Sn alloy to plastic processing such as rolling and extrusion, further rolling to form a sheet, and then subjecting this sheet to expanding. For processing, for example, a conventional method such as rotary or reciprocating can be used. In addition, the battery after the grid is manufactured can be performed in the same manner as in the past, such as preparing positive / negative electrode plates by filling the active material with the grid as a positive / negative electrode grid.
[0019]
A feature of the present invention is the structure of an expanded lattice used as a positive electrode lattice or a negative electrode lattice. In the lattice of this embodiment, the step width b1 of the first node portion protruding from the upper and lower foreheads of the lattice, b6 is 1.4 mm, the step widths b2 and b5 of the node portion following this node are 1.4 mm, the step widths b3 and b4 are 1 mm, the width of the node portion is 10 mm, and the volume of the first node portion Is 0.58 times the volume of the second node.
[0020]
In the remaining node part, the step widths of the two bars derived from the top and bottom of the node part are all 1 mm, and the width of the middle part of the expanded deployment is larger than the thickness of the outer part. The lattice density is also small. Note that the sheet thickness is 1 mm, and the thickness of the lattice node portion is 1 mm. The lattice density refers to the lattice mass per unit area. For example, if the number of node parts included in the unit area is the same, the thinner the crosspiece, the smaller the lattice mass and the smaller the lattice density. In addition, when calculating the lattice density of the entire lattice, the area (upper forehead, lower forehead, and ears) calculated by the vertical and horizontal dimensions of the lattice is the mass of the crosspieces (excluding the upper forehead, lower forehead and ears) It is calculated by dividing by (except for).
[0021]
FIG. 2 is an enlarged schematic plan view of the node portion. As shown in the figure, a is the width of the node portion in the present application, b11 and b22 are step sizes, and C1 and C2 are the derived angles from the node portion of the crosspiece. In the expanded lattice of this embodiment, the derived angles are all set to 30 °.
[0022]
Positive and negative electrode plates were prepared using the above expanded grid, and a liquid lead acid battery for automobiles having a nominal capacity of 12 V and a nominal capacity of 52 Ah was produced using the positive and negative electrode plates. For comparison, a prototype was similarly made using an expanded lattice having a conventional structure. There are two types of expanded lattices of the conventional structure, and only the step width is different from that of the expanded lattice of the embodiment, one of which has a step width of 1 mm and the other of which has a step width of 1.4 mm. Accordingly, in both cases, the volume of the first node portion is 0.5 times the volume of the second node portion.
[0023]
As a result of these trial manufactures, the number of crosspieces during the manufacturing process was the smallest in this embodiment, and the largest in the conventional structure of 1 mm. In addition, although the 1.4mm thing had fewer crosspieces than the 1mm thing, the lattice mass is the largest and is not suitable for weight reduction.
[0024]
Next, as a result of performing a JIS light load life test on these prototype batteries, the battery of this embodiment obtained a life of 10,000 cycles, but the conventional battery using a 1 mm grid could obtain only 7000 cycles. . In the case of using a 1.4 mm grid, almost the same cycle life as that of the battery of this embodiment was obtained.
[0025]
In this way, by using a lattice in which the volume of the first node portion that is protruding from the upper or lower forehead of the expanded lattice is larger than 0.5 times the volume of the second node portion, It is possible to manufacture batteries that are lightweight and have excellent cycle characteristics with good yield, but in order to further reduce weight, in addition to this, as the thickness of the crosspiece moves toward the center of the expanded deployment, An expanded lattice that changes stepwise or continuously and has a lattice density that decreases stepwise or continuously toward the center of the expanded expansion may be used.
[0026]
In the expanded lattice of the above embodiment, it can be said that the thickness of the crosspiece is gradually reduced, but by decreasing the step width and the width of the node portion more finely and gradually toward the center portion, Weight can be reduced. At this time, it is preferable to adjust the derivation angle so that the crossing can be suppressed, and the derivation angle is preferably in the range of 30 ° to 45 °.
[0027]
Similarly, as a method for further reducing the weight, a method using an expanded lattice in which bars having different thicknesses are alternately formed can be used. Also in this case, it is preferable that the crossing can be suppressed by adjusting the derived angle, and the derived angle is preferably in the range of 30 ° to 45 °.
[0028]
In order to reduce the derived angle to a specific range, the value of the width (a) of the node part and the node in all the node parts except the first node part from the upper or lower forehead of the grid It is better to maintain a constant ratio with the value obtained by adding the step widths (b1, b2) of the two bars that are derived from the top and bottom of the section. Can be improved. In addition, when making ratio constant, it is not necessary to be completely constant, and there may be some deviation.
[0029]
【Effect of the invention】
According to the present invention, it is possible to solve the problem of the strength of the expanded lattice and to realize a reduction in the weight of the battery.
[Brief description of the drawings]
[Fig. 1] Charge acceptance characteristics test after deep discharge [Fig. 2] Trickle (float) life test [Fig. 3] Thickness ratio of lead-tin alloy layer to total thickness of integrated sheet and tin of lead-tin alloy layer Relationship between content (mass%) and storage battery performance FIG. 4 is a diagram showing a result of re-evaluation of the test result of FIG. 3 with a higher evaluation criterion that the trickle life of the storage battery is good.

Claims (2)

Equipped with an expanded grid that has been expanded by a rotary method as a positive grid or negative grid,
The expanded lattice is
An upper amount extending in one predetermined direction;
A lower forehead extending in the one direction and disposed opposite to the upper forehead,
A lattice portion connecting the upper forehead and the lower forehead,
The lattice portion does not have a forehead extending in the one direction and connecting at least two or more node portions,
The volume of the upper value and the node of one place eyes emanating from each of the lower amount of the expanding lattice, characterized and Turkey is greater than 0.5 times the volume of the node portion of the two places th Lead acid battery. The thickness of the crosspiece is stepwise or continuously changes brought toward its et Kisupando development central, and Turkey is stepwise or continuously grid density brought toward its et Kisupando development central portion is smaller The lead acid battery according to claim 1 .

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