JP6079445B2 - Storage battery grid and storage battery using the same - Google Patents

Description

  The present invention relates to a storage battery grid and a storage battery using the same.

  Conventionally, as a lattice used in a storage battery, as shown in Patent Document 1, an expanded lattice (mesh lattice) formed by stretching slits in a lead alloy sheet, for example, in a zigzag manner is used. The expanded lattice includes an upper frame in which ears are formed, a lower frame facing the upper frame, and a mesh-like cross formed between the upper frame and the lower frame. And an electrode plate is comprised by filling the active material in the mesh formed with the upper frame, the lower frame, and the mesh-like crosspiece.

  By the way, this expanded lattice has no frame bone connecting the upper frame and the lower frame on both the left and right sides, so that it is easy to extend in the height direction and to bend and deform in the planar direction, so that the active material is easy to fall off. There's a problem. In addition, since the mesh bars of the expanded lattice are zigzag in a saw blade shape from the lower frame to the upper frame, the current path to the ear portion becomes long and the electric resistance becomes large. As a result, there is a problem in that the potential distribution in the entire electrode plate is unbalanced, local corrosion occurs, and the life of the electrode plate is shortened.

JP 7-320743 A

  As shown in FIG. 8, the inventor of the present application has made extensive studies on the above problem, and as shown in FIG. 8, a rectangular frame bone, a first side portion on which ears are formed, and the first side portion. A storage battery grid has been devised that has a second side that faces each other, a plurality of vertical bones that connect the first side and the second side, and a plurality of diagonal bones that extend obliquely with respect to the vertical bone.

  According to the storage battery grid configured in this way, the current path to the ear can be shortened, the electrical resistance of the grid can be reduced, and the potential distribution in the grid can be made uniform, The mechanical strength of the grating can also be improved.

  However, when the inventor uses a storage battery grid having the above-described shape for a lead storage battery, for example, the grid tends to extend in the surface direction due to expansion of the grid and the active material during overcharge, and the slant extends from the first side portion. It was found that the bone was easily cut at the connection with the first side. This is because the lattice described above is easy to extend in the left-right direction because it is difficult to extend in the vertical direction in FIG. 8 because the first side and the second side are connected by the vertical bone. And since the diagonal bone contains the left-right direction component, the stress of the left-right direction is easy to be added by the expansion to the left-right direction of a lattice. Moreover, since the diagonal bone contains the up-down direction component, it extends diagonally and is connected with the 1st side part. The first side portion is formed to be the thickest of the four sides of the frame bone in order to improve the mechanical strength in the vicinity of the ear portion, and hardly deforms due to the stress. On the other hand, such an oblique bone that is connected to the first side and is subject to stress in the left-right direction is thinner than the first side, and local stress concentration occurs at the connection with the first side due to the stress. Occurs and breaks easily. And when the oblique bone is cut at the connection with the first side, the current path to the ear decreases in the vicinity of the ear and the current density rises, so that the current collection efficiency at the ear is adversely affected. Problems arise.

  Accordingly, the present invention has been made to solve the above-mentioned problems all at once, and its main intended problem is to make it difficult to break oblique bones while making the potential distribution in the storage battery grid uniform. .

  That is, the storage battery grid according to the present invention includes a rectangular frame bone, ears protruding from a predetermined first side portion of the four sides of the frame bone, the first side portion and the first side portion. A plurality of vertical bones connecting the second side facing the portion, a plurality of oblique bones extending obliquely with respect to the vertical bone, and a protruding portion protruding into the frame from the first side And at least a part of the plurality of oblique bones extends from the protrusion, and a width dimension of a proximal end portion of the protrusion is larger than a width dimension of the oblique bone.

If it is such, since it has several diagonal bones, the electric current path which reaches an ear | edge part can be shortened. As a result, the electrical resistance of the lattice is reduced, and the potential distribution in the lattice can be made uniform.
Further, since the oblique bone extends from the protrusion formed on the first side, and the width of the base end of the protrusion is larger than the width of the oblique bone, the protrusion is cut off from the oblique bone. Hateful. In addition, when stress along the extending direction (left-right direction) of the first side portion is applied to the lattice, the projecting portion is deformed together with the oblique bone, so the stress generated between the oblique bone and the first side portion is It is possible to disperse and make it difficult to cut the oblique bone.

  In addition, it is desirable that at least a part of the plurality of longitudinal bones extends from a distal end portion of the protruding portion. The diagonal bone is subjected to a stress in the left-right direction and also a vertical stress perpendicular to the left-right direction. Since this vertical stress can be distributed to the longitudinal bone, the oblique bone can be made more difficult to cut. Moreover, since the width dimension of the base end part is large, the electric current from an ear | edge part flows into the protrusion part easily compared with the diagonal bone and vertical bone connected to the 1st edge part. In addition to the oblique bone, the longitudinal bone also extends from the protruding portion, so that the flowing current can be efficiently sent to the downstream side, and the potential resistance of the lattice can be further reduced.

  Moreover, it is preferable that the width dimension of the base end part of the protrusion is larger than the sum of the width of the oblique bone and the width dimension of the longitudinal bone. In this case, the oblique bone can be made more difficult to cut.

  In addition, it is preferable that the projecting portion has a triangular shape in which the width dimension decreases as it goes to the tip, and the oblique bone and the vertical bone extend from the tip of the projecting portion. In this case, for example, as compared with the case where the protrusion has a rectangular shape, when the stress is applied, the entire protrusion is easily deformed, and the stress concentration locally generated between the oblique bone and the first side portion Since it is further reduced, the oblique bone can be made more difficult to cut.

Further, it is preferable that at the intersection where the oblique bone and the longitudinal bone intersect, the first corner where the intersection angle is an acute angle and the second corner where the intersection angle is an obtuse angle are rounded. In this case, even when the oblique bone and the longitudinal bone are deformed by the stress applied to the lattice and the stress concentration occurs at the intersection, the distance between the first corners facing each other and the distance between the second corners facing each other are determined. Since the length can be increased, the mechanical strength of the intersection can be improved and the oblique bone and the longitudinal bone can be made difficult to break.
In particular, if the rounding is not performed, the distance between the second corners facing each other is shorter than the distance between the first corners facing each other, so that the curvature of the rounded surface of the second corner is the first. It is desirable that the curvature is larger than the curvature of the rounded surface at one corner.

  Moreover, the storage battery according to the present invention is characterized by using the storage battery grid described above. With such a configuration, the potential distribution in the lattice can be made uniform and the high rate discharge performance can be improved, but the oblique bones and the vertical bones can be made difficult to break, and the cycle life performance can be improved.

  The storage battery grid is preferably made of a lead alloy. If this is the case, the present invention can be applied to a grid of a lead storage battery.

  The storage battery grid is preferably formed by punching. If it is this, compared with the grating | lattice formed by casting, the thickness of a grating | lattice can be made thin and the mass of a grating | lattice can be made light. Therefore, the lattice material can be reduced and the cost can be reduced.

  According to the present invention configured as described above, the potential distribution in the lattice is made uniform, and when stress is applied to the lattice, the protrusion formed on the first side portion is deformed so that the protrusion The extending oblique bone can be made difficult to cut.

The perspective view of the grid | lattice for lead acid batteries of this embodiment. The top view of the grid | lattice for lead acid batteries of the embodiment. The elements on larger scale of the grid for lead acid batteries of the embodiment. The elements on larger scale which show the protrusion part of the embodiment. The elements on larger scale which show the cross | intersection part of the embodiment. The top view which shows the 1st modification of the grid | lattice for lead acid batteries. The top view which shows the 2nd modification of the grid for lead acid batteries. The top view of the grid | lattice for lead acid batteries devised in the devising process of this embodiment.

  Hereinafter, an embodiment of a storage battery grid 1 according to the present invention will be described with reference to the drawings. In the present embodiment, a grid used for a lead storage battery will be described as an example. Further, the description will be made assuming that the vertical and horizontal directions in FIGS. 1 and 2 are defined as the vertical and horizontal directions as they are.

  The grid 1 of this embodiment is used as a member of a positive electrode plate or a negative electrode plate in an electrode group that is a power generation element of a lead storage battery. In addition, when using this grid | lattice 1 for a positive electrode plate, the grid | lattice 1 is filled with the positive electrode active material (lead dioxide). On the other hand, when the grid 1 is used for a negative electrode plate, the grid 1 is filled with a negative electrode active material (sponge-like lead).

  Specifically, the grid 1 is obtained by punching a rolled sheet made of a lead alloy by punching. As shown in FIGS. 1 and 2, a rectangular frame 2, and the frame 2 Ears 21 formed to project upward from the upper side 2a (first side), outside the frame, a plurality of projections 22 projecting downward from the upper side 2a in the frame bone 2, and the frame A plurality of vertical bones 3 that extend linearly in the vertical direction in the bone 2, and a plurality of oblique bones 4 that are formed in the frame bone 2 so as to be inclined with respect to the vertical bone 3 (vertical direction). Have. Further, the lattice 1 of the present embodiment is configured not to have a lateral bone substantially parallel to the upper side 2a of the frame bone 2.

  As shown particularly in FIG. 2, the lattice 1 includes a main longitudinal bone 3 </ b> X composed of one or a plurality of longitudinal bones 3 extending downward from directly below the connection portion 5 with the ear portion 21 in the upper side 2 a among the plurality of longitudinal bones 3. (Main bone). The main longitudinal bone 3X is substantially perpendicular to the upper side 2a of the frame bone 2 and the lower side 2b (second side) opposite to the upper side 2a, and has a width in the plan view from the top to the bottom. Tapered shape with smaller dimensions. Thereby, it can be set as the optimal vertical-bone shape according to the collected electricity. Further, the electrode plate material can be reduced by reducing the width dimension below.

  Further, the plurality of vertical bones 3 (sub-bones) on both the left and right sides of the main vertical bone 3X are arranged at intervals in the left-right direction (extension direction) of the upper side portion 2a, as shown in FIG. As the distance from the main longitudinal bone 3X increases to the left and right sides, the distance increases. Thereby, it can be set as the optimal space | interval of the longitudinal bone 3 according to the collected electricity. In addition, you may comprise the some vertical bone 3 so that a width dimension may become small as it leaves | separates from the main vertical bone 3X.

  As shown in FIG. 2 in particular, the plurality of oblique bones 4 are formed in a C shape centering on the main longitudinal bone 3X in plan view, and are branched from the main longitudinal bone 3X and extend obliquely downward. It consists of a diagonal bone 4 (4m) and a plurality of diagonal bones 4 (4n) branched from the upper side 2a of the frame bone 2 and extending diagonally downward. Therefore, the upper end portion of the diagonal bone 4 is connected to the main longitudinal bone 3X or the upper side portion 2a of the frame bone 2, and the lower end portion of the diagonal bone 4 is the lower side portion 2b or the two side side portions 2c of the frame bone 2. 2d. That is, the end of the oblique bone 4 extends to the frame bone 2.

In addition, the plurality of oblique bones 4 formed on the left side of the main longitudinal bone 3X are formed so as to be substantially parallel to each other, and the plurality of oblique bones 4 formed on the right side of the main longitudinal bone 3X are substantially parallel to each other. It is formed to be parallel. Thus, since it is mutually substantially parallel, electric potential distribution can be made more uniform. The shape of the space defined by the oblique bone 4 and the vertical bone 3 formed in this way is a rectangular shape.
It should be noted that the intervals between the adjacent oblique bones 4 may be the same, may be a plurality of intervals, or may be configured such that the intervals increase as going downward. That is, the interval between the oblique bones 4 may be varied in order to make the potential distribution uniform.

  Of the plurality of oblique bones 4, the oblique bone 4 (4m) branched from the main longitudinal bone 3X faces both the left and right sides with the main longitudinal bone 3X as an axis, as shown in FIGS. It extends diagonally from 2a toward the lower side 2b. Specifically, the plurality of oblique bones 4 (4m) form a straight line inclined so as to approach the main longitudinal bone 3X as it goes upward in plan view. The shape of the space defined by the main longitudinal bone 3X as a part of the side is a rectangular shape. Thus, since the diagonal bone 4 (4m) is linear, the path of the current generated on the left and right sides of the main longitudinal bone 3X is linear, and the current path to the ear portion 21 via the main longitudinal bone 3X is shortened. can do.

  Specifically, as shown in FIG. 3 in particular, the plurality of oblique bones 4 (4m) formed on the left side of the main longitudinal bone 3X are arranged at intervals in the vertical direction (stretching direction) of the main longitudinal bone 3X. It is inclined at an inclination angle of 45 degrees toward the main longitudinal bone 3X. In addition, the plurality of oblique bones 4 (4 m) formed on the right side of the main longitudinal bone 3X are arranged at intervals in the vertical direction of the main longitudinal bone 3X, and are inclined at 45 degrees toward the main longitudinal bone 3X. Tilt at an angle. Furthermore, in the main longitudinal bone 3X, the connection point P1 of the upper end portion of each oblique bone 4 (4m) formed on the left side and the connection point P2 of the upper end portion of each oblique bone 4 (4m) formed on the right side are It matches in the height direction. With such a configuration, the oblique bone 4 (4m) on the left side of the main longitudinal bone 3X and the oblique bone 4 (4m) on the right side of the main longitudinal bone 3X are symmetric with respect to the main longitudinal bone 3X.

  The oblique bones 4 (4n) branched from the upper side portion 2a among the plurality of oblique bones 4 are arranged at intervals in the left-right direction of the upper side portion 2a in plan view, as shown in FIGS. In the upper side portion 2a, the oblique bone 4 (4n) formed on the left side with the main longitudinal bone 3X as an axis extends toward the side portion 2c, and the oblique bone 4 (4n) formed on the right side is the side edge. It extends toward the part 2d.

  In this embodiment, as shown in FIGS. 1, 2, and 4, a plurality of projecting portions 22 projecting downward from the upper side portion 2a within the frame are formed integrally with the upper side portion 2a. At least a part of the plurality of longitudinal bones 3 and the oblique bones 4 (4n) described above extends from the protrusion 22.

  More specifically, as shown in FIG. 4 in particular, the projecting portion 22 has a triangular shape in which the width dimension in the left-right direction becomes smaller toward the tip portion 220 in plan view. In the form, the longitudinal bone 3 and the oblique bone 4 (4n) extend from the distal end portion 220 one by one.

  Specifically, the protrusion 22 extends from the upper side 2a to the distal end 220 in parallel to the longitudinal bone 3 and from the upper side 2a to the distal end 220 in parallel to the oblique bone 4 (4n). And a second end side 222 extending toward the end. The first end side 221 is formed in a straight line with the vertical bone 3 extending from the distal end portion 220, and more specifically, is formed on the same straight line as the side of the vertical bone 3 far from the ear portion 21. . The second end side 222 is formed in a straight line with the oblique bone 4 (4n) extending from the distal end portion 220. More specifically, the second end side 222 is formed on the same straight line as the lower side of the oblique bone 4 (4n). ing.

  The distal end portion 220 that is continuous with the first end side 221 and the second end side 222 has a width dimension in the left-right direction that is substantially the same as the width dimension of the oblique bone 4 (4n) extending from the tip end portion 220. It is formed to become. As described above, the protruding portion 22 has a triangular shape in which the width dimension in the left-right direction decreases as it goes to the distal end portion 220, and the protruding portion 22 has a width dimension in the left-right direction that extends substantially diagonally over the entire length. It becomes larger than the width dimension of the bone 4 (4n). And the width dimension of the base end part 223 of the protrusion part 22 connected with the upper side part 2a is larger than the sum of the width dimension of the diagonal bone 4 (4n), and the width dimension of the vertical bone 3. FIG. Since the protruding portion 22 is formed in this way, when stress is applied to the lattice 1, the protruding portion 22 is deformed without being cut and is generated between the oblique bone 4 (4n) and the upper side portion 2a. The stress is dispersed, and the oblique bone 4 (4n) is difficult to cut.

  In the present embodiment, the longitudinal bone 3 also extends from the above-described distal end portion 220, and the protruding portion 22 has a width dimension in the left-right direction that is substantially larger than the width dimension of the longitudinal bone 3 over the entire portion. Is formed. Since the protrusions 22 are formed in this way, the path of the current flowing through the vertical bone 3 to the upper side 2a is widened, the electric resistance can be reduced, and the potential distribution can be made more uniform. In addition, when a vertical stress is applied to the lattice 1, the projecting portion 22 is deformed, so that the longitudinal bone 3 is hardly broken. Further, the diagonal bone 4 (4n) is subjected to stress in the left-right direction and stress in the vertical direction. Since this vertical stress can be distributed to the longitudinal bone 3, the oblique bone 4 (4n) can be made more difficult to cut.

  Further, in the distal end portion 220 described above, the corner portion formed by the first end side 221 and the upper side of the oblique bone 4 (4n) and the second end side 222 and the side closer to the ear portion 21 of the longitudinal bone 3 are located. The corners formed by the sides are rounded with rounded corners. Thereby, since the mechanical strength at the corner is improved, the longitudinal bone 3 and the oblique bone 4 (4n) are more difficult to cut, and the stress concentration can be further reduced.

  In the present embodiment, as shown particularly in FIG. 4, the protruding portions 22 are formed on both the left and right sides of the main longitudinal bone 3 </ b> X in the connecting portion 5 with the main longitudinal bone 3 </ b> X in the upper side portion 2 a.

  Further, in the present embodiment, as shown in FIG. 5, an intersecting portion 6 where the longitudinal bone 3 and the oblique bone 4 intersect is formed, and in the intersecting portion 6, the first corner portion 61 whose intersecting angle is an acute angle. And the round process is given to the 2nd corner | angular part 62 whose crossing angle is an obtuse angle, respectively.

More specifically, the crossing angle of the first corner 61 is 45 degrees, and the crossing angle of the second corner 62 is 135 degrees. And these corners 61 and 62 are rounded so that the curvature of the second rounded surface 62a of the second corner 62 is greater than the curvature of the first rounded surface 61a of the first corner 61. It is formed to be large.
In the present embodiment, the rounding is performed so that the second radius of curvature R2 of the second rounded surface 62a is four times the first radius of curvature R1 of the first rounded surface 61a.

  In this way, the first corner 61 and the second corner 62 are rounded to increase the distance between the opposing first corners 61 and the distance between the opposing second corners 62. The mechanical strength at the intersection 6 between the longitudinal bone 3 and the oblique bone 4 can be improved.

  Next, the result of the potential distribution analysis of the lattice 1 configured as described above and the conventional expanded lattice is shown. The conventional expanded lattice has a lattice size [width (mm) × height (mm)] of 137.0 × 115.0, a lattice thickness (mm) of 1.00, and a lattice mass (g) of 42. 0. The lead storage battery grid of the present invention has a grid size [width (mm) × height (mm)] of 137.0 × 115.0, a grid thickness (mm) of 0.80, and a grid mass ( g) was set to 42.0. Then, a potential distribution analysis was performed by supplying a current of 1 A to the upper ends of the ears of the conventional expanded grid and the grid for the lead storage battery of the present invention.

  At this time, the ratio of the potential drop (voltage drop) amount with respect to the lower frame of the conventional expanded grid as a reference (0 V) is set to 100%, and the tilt angle of the oblique bone of the lead-acid battery grid of the present invention is 0 to 80 degrees. Table 1 shows the ratio of the potential drop amount and the uniformity of the potential distribution with the lower side of the lead-acid battery grid of the present invention as a reference (0 V).

* Uniformity of potential distribution: ◎: Excellent, ○: Good, ×: Impossible

  The ratio of the potential drop amount of the grid for the lead storage battery of the present invention decreased to 48 to 50% with respect to the ratio of the potential drop amount of the conventional expanded grid. Moreover, the uniformity of the potential distribution of the grid for the lead storage battery of the present invention was ◎ or ◯ (excellent or good), which was superior to the x (impossible) of the uniformity of the potential distribution of the conventional expanded grid. From this, it was found that the potential distribution of the entire grid in the lead storage battery grid of the present invention was made uniform with respect to the conventional expanded grid. Furthermore, when the inclination angle of the oblique bone of the lead-acid battery grid of the present invention is 0 degree or 80 degrees, the uniformity of the potential distribution of the entire grid is ○ (good), while the lead-acid battery grid of the present invention is oblique. When the bone inclination angle was in the range of 5 to 60 degrees, the uniformity of the potential distribution was excellent (excellent). From this, it was found that if the inclination angle of the oblique bone of the grid for the lead storage battery of the present invention is in the range of 5 to 60 degrees, the potential distribution is made more uniform.

  Thus, by using the lead-acid battery grid of the present invention for a lead-acid battery, if the lead mass is about the same as that of a conventional expanded grid, the discharge rate (cold cranking) is higher than that of the conventional expanded grid. Current and low-temperature high-rate discharge performance) can be improved. On the other hand, by using the electrode plate for a lead storage battery of the present invention for a lead storage battery, high rate discharge performance (cold cranking current, low temperature high rate discharge performance) comparable to that when using a conventional expanded grid is achieved. This can be realized with a small electrode plate.

  Table 2 shows the results of elongation analysis of the above-described conventional expanded lattice and the lead-acid battery lattice of the present invention.

  In the lead storage battery grid according to the present invention, when the ratio of the lattice extension amount in the width direction (left-right direction) of the conventional expanded lattice and the ratio of the lattice extension amount in the height direction (vertical direction) are each 100%, With respect to the expanded lattice, the ratio of the lattice elongation in the width direction was reduced to 50% to 80%, and the proportion of the lattice elongation in the height direction was decreased to 43% to 57%. From this, it was found that the lattice elongation amount was reduced in both the width direction and the height direction in the lead-acid battery grid of the present invention. Therefore, the lead-acid battery to which the grid of the present invention is applied can improve cycle life performance, such as an increase in the number of cycles in a cycle life test at an ambient temperature of 75 ° C. according to the light load life test defined in JIS 5301. it can.

  According to the lattice 1 according to the present embodiment configured as described above, the space defined by the longitudinal bone 3 and the oblique bone 4 has a rectangular shape, so that the ear portion is compared with the triangular shape. The detour route away from 2 can be reduced. Further, since the main longitudinal bone 3X is provided below the ear portion 21, the distance between the ear portion 21 and the lower side portion 2b of the frame bone 2 can be shortened. Furthermore, since it has the some diagonal bone 4 (4m) extended diagonally downward from the main vertical bone 3X, the electric current produced in the side part of the main vertical bone 3X reaches the ear | edge part 21 via the main vertical bone 3X. The route can be shortened. In addition, since the plurality of oblique bones 4 are formed in a C shape centering on the main longitudinal bone 3X in plan view, the current generated on both the left and right sides of the main longitudinal bone 3X is used as the main longitudinal bone 3X or ear portion. The route to 21 can be shortened. Therefore, the electrical resistance can be reduced in the entire grid 1, and the potential distribution in the electrode plate can be made uniform.

  Further, the lattice 1 of the present embodiment is composed of a plurality of longitudinal bones 3 and a plurality of oblique bones 4 and does not have a transverse bone substantially parallel to the upper side 2a of the frame bone 2, so that the main longitudinal bone 3X Since the current paths generated on both the left and right sides are only the upward path composed of the longitudinal bone 3 and the obliquely upward path composed of the oblique bone 4, the ear portion 21 via the main longitudinal bone 3X and the upper side portion 2a. The path leading to can be shortened, and the electrical resistance can be reduced.

  Moreover, since it has the frame 2 which makes a rectangular shape, mechanical strength can be improved.

  In particular, the oblique bone 4 (4n) extends from the protruding portion 22 formed on the upper side 2a, and even when a stress in the horizontal direction is applied to the lattice 1, the protruding portion 22 is deformed. While being suppressed, stress concentration locally generated between the oblique bone 4 (4n) and the upper side portion 2a can be reduced. Moreover, since the shape of the protrusion part 22 is a triangle shape, the protrusion part 22 deform | transforms over the whole and can reduce stress concentration more. Thereby, the oblique bone 4 (4n) can be made difficult to cut.

  Further, by forming the lattice 1 by punching, the lattice thickness can be made thinner (the lattice mass can be made lighter) as compared with the case where it is formed by casting. Therefore, the cost can be reduced by reducing the lattice material. The difference in the lattice thickness is due to the difference in the corrosion form due to the different metal structures. In general, a cast lattice has a characteristic that the crystal grains are large and the corrosion progresses so as to enter the crystal grain boundary, so that the cast lattice breaks while the corrosion rate is small. On the other hand, a punched lattice produced by punching a rolled sheet is subjected to a rolling process after the slab is produced, so that large crystal grains in the slab are stretched in the rolling direction and there are no grain boundaries that break the lattice, resulting in corrosion. Has the property of proceeding sequentially from the lattice surface. Due to this characteristic, the punched grating produced from the rolled sheet can be made thinner than the cast grating.

The present invention is not limited to the above embodiment.
For example, in the above-described embodiment, the projecting portion 22 has a triangular shape in plan view, but may have any other shape such as a polygonal shape or a semicircular shape. As shown in FIG. 6, it may be rectangular in plan view. If it is such, since the width dimension of the left-right direction in the front-end | tip part 220 of the protrusion part 22 can be enlarged compared with what makes triangular shape, the mechanical strength of the front-end | tip part 220 can be improved. . In addition, the shape of the protrusion 22 may be, for example, a polygonal shape or a partial circular shape in plan view, and the width dimension may be larger than the width dimension of the oblique bone 4 (4n).

  In the above embodiment, the second radius of curvature R2 of the second radius of machining surface 62a is four times as large as the first radius of curvature R1 of the first radius of radius machining surface 61a. As long as the curvature of the surface 62a is larger than the curvature of the first rounded surface 61a, the ratios of the curvature radii R1 and R2 may be other ratios. Furthermore, since the distance between the opposing first corner portions 61 is longer than the distance between the opposing second corner portions 62, the first corner portion 61 may not be rounded.

  Further, as shown in FIG. 7, the upper side 2a of the frame bone 2 may have a shape in which the height dimension increases toward the ear 21 in a plan view. Specifically, the lower surface of the upper side portion 2a of the frame bone 2 has a V-shape that is inclined downward toward the ear portion 21 from both end portions. Thereby, not only can the mechanical strength of the grating 1 be improved, but also the potential distribution in the electrode plate can be made more uniform.

  Furthermore, in the lattice 1 of the above embodiment, the first side portion is the upper side portion 2a, and the ear portion 21 and the protruding portion 22 are formed on the upper side portion 2a, but the first side portion is the lower side portion 2b or 2. One of the two side portions 2c and 2d may be used. In this case, the ear part 21 and the protruding part 22 are formed on one of the lower side part 2b or the two side parts 2c and 2d as the first side part, and the oblique bone 4 (4n) is connected to the protruding part 22. It only has to be done.

  In the embodiment, the main longitudinal bone 3X is one longitudinal bone 3, and a plurality of oblique bones 4 extend from the main longitudinal bone 3X. However, the main longitudinal bone 3X is defined as a plurality of longitudinal bones 3. A plurality of oblique bones 4 may extend from the plurality of main longitudinal bones 3X.

  In the above-described embodiment, the main longitudinal bone 3X has a tapered shape. However, not only the main longitudinal bone 3X but also the other longitudinal bones 3 may have a shape in which the width dimension decreases from the top to the bottom.

  Further, in the embodiment, the inclination angles (for example, 45 degrees) of the plurality of oblique bones 4 on the left side of the main longitudinal bone 3X and the inclination angles (for example, 45 degrees) of the plurality of oblique bones 4 on the right side of the main longitudinal bone 3X are the same. However, the inclination angle of the oblique bone 4 may be different on the left and right sides. That is, for example, the inclination angle of the plurality of oblique bones 4 on the left side of the main longitudinal bone 3X may be 45 degrees, and the inclination angle of the plurality of oblique bones 4 on the right side of the main longitudinal bone 3X may be 60 degrees.

  In addition, in the above-described embodiment, the inclination angle of the oblique bone 4 is 45 degrees, but may be another inclination angle, for example, 60 degrees (30 degrees with respect to the main longitudinal bone 3X).

  In addition, in the embodiment, the connecting portion between the main longitudinal bone 3X and the diagonal bones 4 on the left and right sides is the same in the height direction, but may be shifted in the height direction.

  Moreover, in the said embodiment, although all the diagonal bones 4 were connected to either the lower side part 2b or the two side parts 2c and 2d of the frame bone 2, some diagonal bones 4 are frame bones. 2 may be configured not to be connected to any of the lower side 2b and the two side sides 2c, 2d.

  Moreover, in the said embodiment, although the grating | lattice 1 was formed by stamping, you may form by casting.

  Furthermore, although the said embodiment demonstrated and demonstrated the grating | lattice 1 used for a lead storage battery as an example, it is not restricted to this, It can apply to the grating | lattice filled with active materials, such as a nickel metal hydride battery.

  In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Lattice 2 ... Frame bone 2a ... Upper side part 21 ... Ear part 22 ... Projection part 3 ... Vertical bone 4 ... Diagonal bone 5 ... Connection part 6 ...・ Intersection

Claims (5)

A rectangular frame bone,
Ears protruding out of the frame from a predetermined first side of the four sides of the frame bone;
A plurality of longitudinal bones connecting the first side and the second side facing the first side;
A plurality of oblique bones extending obliquely with respect to the longitudinal bone;
A protruding portion protruding into the frame from the first side portion,
At least a part of the plurality of oblique bones extends from the protrusion,
The width dimension of the base end part of the protrusion is larger than the width dimension of the oblique bone,
At the intersection where the longitudinal bone and the oblique bone intersect, the first corner where the intersection angle is acute and the second corner where the intersection angle is obtuse are rounded .
The longitudinal bone and the oblique bone intersect at the protrusion, and the intersection is formed at the protrusion.
A grid for a storage battery in which a round process is applied to a corner portion of the intersecting portion formed in the protruding portion .   The storage battery grid according to claim 1, wherein at least a part of the plurality of vertical bones extends from a distal end portion of the protruding portion.   The storage battery terminal according to claim 2, wherein a width dimension of a base end portion of the protrusion is larger than a sum of a width dimension of the oblique bone and a width dimension of the longitudinal bone. The protrusion has a triangular shape in which the width dimension decreases as it goes to the tip.
The grid for a storage battery according to claim 2 or 3, wherein the oblique bone and the vertical bone extend from a tip portion of the protruding portion. Storage battery using the grid storage battery according to any one of claims 1 to 4.