JPH043402Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cast anode lattice body used for constructing an anode plate of a lead-acid battery.

[Prior Art] There is an urgent need to make lead-acid batteries used in automobiles, etc. maintenance-free, and to make them smaller and lighter. As is well known, in order to make lead-acid batteries maintenance-free, a Pb--Ca alloy is often used as the material for the cast anode grid. In addition, there are many requirements for making lead-acid batteries smaller and lighter, but the important ones are increasing the utilization rate of active materials and reducing the amount of each material, and making the anode casting grid thinner and lighter. The goal is to make the world a better place.

In lead-acid batteries, while there is room to reduce the amount of the cathode active material, there is a limit to reducing the amount of the anode active material. In storage batteries, if the amount of positive electrode active material is reduced too much, the capacity will deteriorate prematurely. Therefore, in the case of an anode plate, where reducing the amount of the anode active material too much will cause premature deterioration of the capacity, there is a restriction that the amount of the anode active material cannot be reduced too much.

[Problems to be solved by the invention] Therefore, when trying to make the cast anode grid used in this type of anode plate thinner and lighter, it is necessary to make it thinner and lighter while still securing the necessary amount of anode active material. The problem is that it has to be done. However, if the overall thickness of the cast anode grid for lead-acid batteries is simply reduced in order to reduce weight, the spatial volume of the grid, which is closely related to the amount of active material retained, will decrease, and the amount of active material packed will decrease. The problem is that it is decreasing.

To explain the reason, generally the conventional lattice body is
and FIG. 7 (cross-sectional view taken along line B-B in FIG. 5).
is a substantially rectangular frame bone that constitutes the outer frame of the lattice body, 2 is an inner bone arranged inside the frame bone 1, and the inner bone 2 has a horizontal bone 3 extending in the horizontal direction and a vertical bone extending in the vertical direction. The bones 4 form a lattice-like structure. An ear portion (terminal portion) 5 is formed near one end of the upper portion of the frame bone 1, and a leg portion 6 is formed at the lower portion of the frame bone 1. The cross-sectional shapes of the vertical bones 4 and the horizontal bones 3 forming the inner bones 2 are as shown in FIGS. 6 and 7, respectively, and the active material is filled in the space of the lattice-shaped portion formed by the inner bones. . The volume of the space filled with this active material is called the filling volume.

The above filling volume is V, the density of the lead alloy is ρ, the thickness of the lattice body is t, the total weight of the inner rib is w, the horizontal inner dimension of frame rib 1 is d, and the longitudinal inner dimension is h. Then, the filling volume V is given by the following formula.

V=h x d x t-(w/ρ) Here, if h and d are constant, t and w need to be made smaller in order to make the grid thinner and lighter. When t is made smaller, V also becomes smaller. That is, if the structure of the conventional lattice body is left unchanged and the structure is made thinner and lighter, the filling volume becomes smaller and it becomes impossible to fill the required amount of active material.

In addition, if the filling volume becomes smaller due to the thinner and lighter lattice body, it may be possible to apply a thick layer of active material to increase the amount of active material to be filled. Since the amount filled in each part of the electrode plate is not uniform, the thickness of each part of the electrode plate becomes uneven, and the active material tends to fall off, which is undesirable.

In addition, as shown in the lattice shape shown in Utility Model Application No. 48-5233 Microfilm, synthetic resin protrusions or protrusions are provided on either the vertical or horizontal ribs of the lattice body to increase the amount of active material filled. It has also been proposed to increase the However, although synthetic resin protrusions or protrusions contribute to weight reduction, they have problems in that current collection performance deteriorates and fixing work is extremely troublesome. Further, there is a problem that the active material cannot necessarily be retained sufficiently if only one of the vertical bones or the horizontal bones is provided with a protrusion or protrusion. In order to prevent the active material from falling off, it may be possible to fix synthetic resin protrusions or protrusions on both the vertical and horizontal bones, but doing so would not only make the work of fixing the protrusions or protrusions troublesome; However, there is a problem that the amount of active material filled is reduced.

An object of the present invention is to provide an anode lattice for a lead-acid battery that is thin and lightweight and that can secure the required amount of active material.

[Means for solving the problems] The present invention is illustrated in FIGS. 1 to 3 showing one embodiment thereof.
As seen in the figure, a frame bone 11 and a plurality of transverse bones 1
For a cast anode lattice body for a lead-acid battery having an inner rib 12 consisting of a frame rib 11 and a plurality of vertical ribs 14, the inner rib 12 is formed in a lattice shape in the area of the frame rib 11, and one of the adjacent transverse ribs 13 is formed. is integrally formed with a protrusion 13a that protrudes outward from one end surface 11a of the frame rib 11 in the thickness direction, and the other horizontal rib 13 has a protrusion 13a that protrudes outward from the other end surface 11b of the frame bone 11 in the thickness direction. The protruding portion 13b is integrally formed. and,
One of the adjacent longitudinal ribs 14 has a protrusion 1 that protrudes outward from one end surface 11a in the thickness direction of the frame rib 11.
4a, and the other vertical rib 14 is integrally formed with a protrusion 14b that protrudes outward from the other end surface 11b in the thickness direction of the frame rib 11.

[Operation of the device] As described above, when the inner bone 12 is formed, the protrusions 13a, 13b, which are integrally formed on the horizontal bone and the vertical bone,
Since the spaces 14a and 14b can be filled with the active material, it is possible to secure the required amount of active material even if the weight of the cast grid body is reduced by reducing the thickness of the frame 11. . In addition, since the protrusion of the present invention is integrally formed with the horizontal and vertical bones, the current collection performance does not deteriorate and the protrusion can be easily formed. Moreover, in the present invention, in both the vertical bones 14... and the horizontal bones 13...
Frame bone 1 alternately on adjacent transverse or longitudinal bones
In order to provide protrusions that protrude in different directions in the thickness direction of 1, the number of protrusions is not too large, and the active material is distributed evenly over the entire lattice body in a sufficient amount to prevent it from falling off. can be reliably filled.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a front view showing the overall shape of one embodiment of the cast anode grid for lead-acid batteries of the present invention, and FIG. , shown in FIGS. 3 and 4.

In these figures, 11 is a frame bone, 12 is a lattice-shaped inner bone consisting of horizontal bones 13 and vertical bones 14, and an ear 15 is located near one end of the upper part of the frame bone 11.
Further, leg portions 16, 16 are provided at the lower portion.
This lattice body is formed, for example, by casting using a Pb-Ca alloy.

The shape of the lattice body of the present invention when viewed from the front is similar to that of the conventional lattice body, but in the present invention, the internal bone 1
2 is Δt outward from both ends of the frame bone 11 in the thickness direction.
It has a protruding part (projection part). In this embodiment, as shown in FIG. 2, one of the adjacent longitudinal ribs 14 is formed with a protrusion 14a that protrudes outward from one end surface 11a in the thickness direction of the frame rib 11, and the other longitudinal The bone 14 is formed with a protrusion 14b that protrudes outward from the other end surface 11b of the frame bone 11 in the thickness direction. That is, the vertical ribs 14, 14, . . . are arranged horizontally at predetermined intervals.
are alternately formed so as to protrude outward from the end surface in the thickness direction of the frame rib 11 by Δt in different directions in the thickness direction, so that the protrusions 14a and 14b are distributed as evenly as possible in the lateral direction on both the front and back surfaces of the lattice body. is taken into consideration. Further, as shown in FIGS. 3 and 4, a protruding portion 13a that protrudes outward from one end surface 11a in the thickness direction of the frame bone 11 is also formed on one of the adjacent transverse bones 13, and The other end surface 11 in the thickness direction of the frame bone 11 is also attached to the horizontal bone 13.
A protrusion 13b is formed that protrudes outward from b. That is, the horizontal ribs 13, 13, ... are also provided so that their respective end faces in the thickness direction protrude alternately by Δt in different directions, and the protrusions 13a and 13b are distributed as uniformly as possible in the longitudinal direction on both the front and back surfaces of the lattice body. care has been taken to ensure that That is, the thickness of the inner bone of the lattice body of the present invention is given by T=t+2×Δt.

As mentioned above, in the conventional lattice body, the thickness t of the frame ribs is the thickness of the lattice body, and as the thickness t of the frame ribs is reduced, the amount of active material filled is also reduced. On the other hand, in the lattice body of the present invention, the thickness of the lattice body is determined not by the thickness t of the frame ribs 11 but by the thickness T of the inner ribs 12, so that the space that can be filled with the active material can be increased. I can do it. That is, in the present invention, since the space formed by the portion of the inner rib 12 protruding from the frame rib 11 by Δt can also be filled with the active material, the amount of active material filled can be increased. Therefore, for example, if the number and cross-sectional area of the horizontal and vertical bones constituting the inner rib 12 are the same as before, and the thickness t of the frame rib 11 is reduced by Δt, the weight of the lattice body can be reduced and the active material can be filled. By setting Δt appropriately according to the weight of the grid, the weight of the active material, the type of battery, etc., the weight of the electrode plate can be reduced and the amount of active material required can be secured as before. amount can be secured.

Since this type of lattice body is manufactured by casting, when the overall thickness of the lattice body is reduced, it may become difficult to cast the inner bone portion with a small cross-sectional area. On the other hand, if the thickness of only the frame rib portion is reduced as in the present invention, the problem of difficulty in casting does not occur. That is, the cross-sectional area of the frame bone 11 is equal to that of the inner bone 12.
The cross-sectional area of the frame bone is much larger than that of the inner frame, and the injection path for molten lead alloy when casting the lattice body is wider in the frame bone than in the inner frame. There is no problem that it will not be done. Furthermore, since the cross-sectional area of the internal bone portion does not decrease, casting thereof does not become difficult. Therefore, according to the present invention,
It is possible to reduce the weight of the electrode plate and secure the necessary amount of active material without any reduction in productivity.

[Effects of the invention] According to the invention, a space that can be filled with active material can be secured by the protrusions integrally formed on the horizontal and vertical bones, so the weight of the cast lattice body can be reduced by reducing the thickness of the frame bones. It is possible to secure the required amount of active material even if the amount of active material is increased. In addition, since the protrusion of the present invention is integrally formed with the horizontal and vertical bones, the current collection performance does not deteriorate and the protrusion can be easily formed. Furthermore, in the present invention, protrusions that alternately protrude in different directions in the thickness direction of the frame bone are provided on both the longitudinal and transverse bones, so that the number of protrusions is too large. It is possible to reliably fill the entire lattice with the active material evenly and in a sufficient amount without causing any shedding.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention, Figures 2, 3 and 4 are respectively -
5 is a front view showing a conventional example, and FIGS. 6 and 7 are sectional views taken along line A-A and B of FIG. 5, respectively.
-B sectional view. 1, 11... Frame bone, 11a, 11b... End surface,
2,12...Inner bone, 3,13...Transverse bone, 13a,
13b...Protrusion, 4, 14...Vertical bone, 14a,
14b... Protrusion, 5, 15... Ear, 6, 16
...Leg, t...Thickness of the frame bone, Δt...Thickness of the protruding part of the inner bone, d...Inner dimension in the lateral direction of the frame bone, h
...The vertical inner dimension of the frame bone.

Claims (1)

[Claims for Utility Model Registration] Frame bone 11, a plurality of horizontal bones 13 and a plurality of vertical bones 1
This is a cast anode lattice body for a lead-acid battery, which has an inner rib 12 consisting of four ribs, the inner rib 12 being formed in a lattice shape in the area of the frame rib 11, and one of the adjacent transverse ribs 13 having the frame rib. A protrusion 13a that protrudes outward from one end surface 11a in the thickness direction of the frame rib 11 is integrally formed, and a protrusion 13a that protrudes outward from the other end surface 11b of the frame rib 11 in the thickness direction is integrally formed. 13b is integrally formed, and one of the adjacent longitudinal ribs 14 is integrally formed with a protrusion 14a that protrudes outward from one end surface 11a in the thickness direction of the frame rib 11, and the other longitudinal rib 1
4 includes the other end surface 11 in the thickness direction of the frame rib 11.
A cast anode lattice body for a lead-acid battery, characterized in that a protruding part 14b protruding outward from b is integrally formed.