JP6503634B2 - Lattice for lead storage battery and lead storage battery using the same - Google Patents

Description

  The present invention relates to a storage battery and a grid used therefor.

  Conventionally, as a grid used for a storage battery, as shown in Patent Document 1, there is a grid having a large number of longitudinal bones and internal bones such as transverse bones in a frame bone. And in this lattice, internal bones, such as a longitudinal bone and a transverse bone, make linear form, and it has a structure which makes planar shape as the whole lattice.

  When charge and discharge are repeated, the active material filled in the above-mentioned lattice will repeat expansion and contraction, breaking bonds between active material particles and becoming a softened state.

  However, the longitudinal and transverse bones of the lattice are straight, and there is a problem that the softened active material is easily detached from the lattice. Here, as shown in Patent Document 2, it is also conceivable to improve the adhesion between the lattice and the active material by performing the concavo-convex processing on the inner side of the mesh formed of the longitudinal bone and the transverse bone. Although the adhesion in the grid is improved, the active material on both sides in the lattice thickness direction in the inner bone is also likely to fall off. Further, as shown in Patent Document 3, although it is conceivable to improve the adhesion between the lattice and the active material by roughening the surfaces of the longitudinal bones and the transverse bones, it is not sufficient and it is easy to drop off. In addition, when coating an active material from only one side on a flat grid, there is a problem that the active material does not easily move to the surface opposite to the coated surface, and the filling property of the active material is also deteriorated. .

JP 2012-89511 A JP 2001-135318 A JP, 2004-158433, A

  Therefore, the main object of the present invention is to improve the charge-discharge cycle life performance by suppressing the dropout due to the softening of the active material or the like in a grid for a storage battery having a plurality of inner bones in a frame. is there.

  That is, the storage battery grid according to the present invention is a storage battery grid including a frame bone and a plurality of inner bones connected to the frame bone, wherein at least a part of the inner bones extend in the grid thickness direction. It is characterized by having one or more convex portions formed by bending.

  In such a storage battery grid, since at least a part of the inner bone has a convex portion formed by bending in the grid thickness direction, adhesion with the active material in at least one surface in the grid thickness direction is achieved. It is possible to improve the quality. Thereby, the charge / discharge cycle life performance of the storage battery can be improved.

  Here, as the shape of the convex portion, a bent shape or a curved shape may be considered, but in order to reduce the residual stress after processing and improve the resistance to overcharge corrosion, the bent point of the convex portion It is preferable that the number of them is small, and in particular, the convex portion has a curved shape.

  The convex portion of the inner bone has a first convex portion which is convex on one side in the lattice thickness direction, and a second convex portion which is convex on the other side of the lattice thickness direction. Is desirable. In this case, it is possible to suppress the detachment of the active material from the lattice on both sides in the lattice thickness direction.

  Preferably, in the inner bone, the first convex portion and the second convex portion are alternately formed. In this case, the adhesion to the active material on both sides in the lattice thickness direction can be improved. Also, in the inner bones adjacent to each other, the active material is wrapped between the first convex portion formed on one inner bone and the second convex portion formed on the other inner bone, that is, from the lattice thickness direction Therefore, it is possible to further suppress the detachment from the lattice.

  The frame has a first side connected to the current collection portion and a second side opposite to the first side, and the plurality of inner bones include the first side and the first side. It is a longitudinal bone connecting the second side, and in a side view seen from a direction parallel to the first side, it is desirable that the shapes of the side bones adjacent to each other are different from each other. In this case, since the side view shapes of the inner bones adjacent to each other are different from each other, the active material filled in the lattice is held so as to be enclosed between the projections formed on the inner bones adjacent to each other, and the active material is Even if it is softened, it is possible to further suppress the detachment from the lattice. In addition, when the active material is coated from only one side, the active material is coated with the convex portions formed in the lattice thickness direction facing the mounting surface, so that the surface opposite to the coated surface is activated. A substance can be easily introduced, and the filling property of the active material can also be improved.

  The frame has a rectangular shape, and a third side connecting one end of the first side and one end of the second side, and the other end of the first side And a fourth side connecting the other end of the second side. In this case, it is possible to suppress the elongation of the grid in the direction in which the first side and the second side face each other due to the displacement of the bending amount of the bent inner bone.

  All the inner bones have the plurality of projections, and the positions of the projections formed on the adjacent inner bones are offset along the extension direction of the inner bone, It is desirable that the side view shapes of the inner bones adjacent to each other be configured to be different from each other. Further, it is desirable that the inner bones adjacent to each other have the same periodic shape pattern. In this case, it is only necessary to shift the positions of the convex portions formed in the inner bones adjacent to each other, and the manufacturing of the storage battery grid can be facilitated.

  The convex portion has a plurality of oblique bones extending obliquely with respect to the inner bone, and the inner bone has a plurality of intersections with the oblique bones, and the convex portion is provided between the adjacent intersections. Is preferably formed. In this case, since a plurality of diagonal bones are provided, the current path to the ear can be shortened. Thereby, the electrical resistance of the grid is reduced, and the potential distribution in the grid can be made uniform. Moreover, since the convex part is formed between the crossing parts, the diagonal bone can be made linear, and the current path in the diagonal bone can be shortened.

  It has a plurality of oblique bones extending obliquely with respect to the inner bone, and the plurality of oblique bones have one or more convex portions formed by bending in the lattice thickness direction. desirable. This can further improve the adhesion to the active material on at least one surface in the lattice thickness direction, and further suppress the detachment of the active material from the lattice even when the active material is softened. can do.

  A storage battery according to the present invention is characterized in that the storage battery grid according to any one of the above is used.

  With such a storage battery, the retention of the active material in the storage battery grid can be improved, and charge / discharge cycle life performance can be improved.

  It is desirable that the storage battery grid be made of lead alloy. The invention can then be applied to a grid of lead-acid batteries.

  According to the present invention configured as described above, in the storage battery grid having a plurality of inner bones in the frame bone, at least a part of the inner bones has a convex portion formed by bending in the grid thickness direction Accordingly, it is possible to improve the charge and discharge cycle life performance by suppressing the detachment of the active material due to the softening and the like.

The top view of the grid | lattice for lead acid batteries of this embodiment. The perspective view which shows partially three adjacent vertical bones of the embodiment. The right view which shows partially three adjacent vertical bones of the embodiment. The figure which shows the example of a shape of the convex part formed in the longitudinal bone of the embodiment. The figure which shows the planar view shape of the grating | lattice of the comparative example of the embodiment, and an Example.

  Hereinafter, an embodiment of a storage battery grid 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 upper, lower, left, and right directions in FIG. 1 are defined as the upper, lower, left, and right directions.

  The grid 1 of the present embodiment is used as one member of a positive electrode plate or a negative electrode plate in an electrode group which is a power generation element of a lead storage battery. When the grid 1 is used as a positive electrode plate, the grid 1 is filled with a positive electrode active material (lead dioxide). On the other hand, when the grid 1 is used as a negative electrode plate, the grid 1 is filled with a negative electrode active material (spongy lead).

  Specifically, the grid 1 is obtained by punching a rolled sheet made of lead alloy and having a constant thickness by punching. Then, as shown in FIG. 1, the lattice 1 is provided in a frame 2, a plurality of longitudinal bones (inner bones) 3 provided in the frame 2 and extending in the vertical direction, and the frame 2. And a plurality of diagonal bones 4 extending obliquely from the vertical direction.

  The frame bone 2 has a substantially rectangular shape, and a first side 2a provided with an ear 21 projecting to the outside of the frame, a second side 2b facing the first side 2a, a first side 2a, and a second side A third side 2c and a fourth side 2d substantially orthogonal to the two side 2b are provided. The third side 2c connects one end of the first side 2a and one end of the second side 2b. The fourth side 2 d connects the other end of the first side 2 a and the other end of the second side 2 b.

  The plurality of vertical bones 3 connect the first side 2 a and the second side, and one or more extending downward from the connection portion with the ear 21 at the first side 2 a (this embodiment) In this, one main vertical bone 3X is included.

  The main vertical bone 3X linearly extends substantially orthogonally to the first side 2a and the second side 2b of the frame 2 and has a smaller width as going from the top to the bottom in a plan view. It has a tapered shape. As a result, by thickening the part with a large amount of electricity near the ear that is the current collector and narrowing the part with a small amount of electricity, current collection can be efficiently performed while suppressing the amount of electrode plate material used. .

  Further, the plurality of vertical bones 3 on the left and right sides of the main vertical bone 3X are disposed at equal intervals in the left-right direction (extension direction) of the first side 2a. The plurality of longitudinal bones 3 on the left and right sides of the main longitudinal bone 3X may be configured such that the width dimension of the longitudinal bone 3 becomes smaller as it gets farther from the main longitudinal bone 3X. Thereby, according to the amount of electricity collected, it can be set as the optimal space | interval of the longitudinal bone 3. As shown in FIG. Besides, the plurality of vertical bones 3 may be configured such that the width dimension becomes smaller as they move away from the main vertical bone 3X.

  As shown in FIG. 1, the plurality of diagonal bones 4 are disposed on the left side of the main longitudinal bone 3X and extend diagonally downward, and the diagonal bones 4 are disposed on the right side of the main longitudinal bone 3X and extend diagonally downward And diagonal bone 4 (4N). The uppermost diagonal bone 4M and the diagonal bone 4N connected to the main vertical bone 3X extend diagonally downward from immediately below the connection with the ear 21 at the first side a. A part (one in this embodiment) of the diagonal bone 4M branches from the first side 2a and extends obliquely downward. In addition, a part of the diagonal bone 4M (one of the lowermost ones of the plurality of diagonal bones 4M in the present embodiment) and a part of the diagonal bone 4N (the lowermost one of the plurality of diagonal bones 4N in the present embodiment) One end is provided not at the third side 2c and the fourth side 2d, but at a position where the longitudinal bone 3 is intersected.

  That is, the upper end of the oblique bone 4M is connected to the main vertical bone 3X or the first side 2a, and the lower end is connected to the third side 2c or the vertical bone 3. The upper end of the oblique bone 4N is connected to the main vertical bone 3X, and the lower end is connected to the fourth side 2d or the vertical bone 3.

  Here, the plurality of diagonal bones 4M are bent once at a position where they intersect the longitudinal bone 3. And it is divided into two divided bones at the bending point which bent. The two split bones are connected to the first split bone 4a disposed at a position close to the main longitudinal bone 3X and the first split bone 4a and a second split bone disposed at a position distant from the main longitudinal bone 3X. And 4b.

  In the present embodiment, the first divided bone 4a is disposed so that the inclination angle with respect to the main vertical bone 3X is 75 degrees, and the second divided bone 4b is arranged such that the inclination angle with respect to the main vertical bone 3X is 90 degrees. It is arranged. Therefore, these two divided bones 4a, 4b are inclined within a range in which the inclination angle with respect to the main longitudinal bone 3X does not exceed 90 degrees, and the inclination angle of the second divided bone 4b is greater than the inclination angle of the first divided bone 4a. It is provided to be large. In addition, the inclination angle with respect to the main longitudinal bone of each divided bone 4a, 4b can be suitably changed in the range which does not exceed 90 degree.

  Further, the plurality of diagonal bones 4M are bent at a position where they intersect with the same longitudinal bone 3x, and the bending points of the plurality of diagonal bones 4M and the longitudinal bone 3x are located along the vertical direction. That is, in the plurality of diagonal bones 4M, bending points between the first divided bone 4a and the second divided bone 4b are located on the same vertical bone 3x.

  On the other hand, the diagonal bone 4N extends straight from the connection portion with the first side 2a or the main vertical bone 3X without bending from the first side 2a to the second side 2b. The inclination angle of the oblique bone 4N to the main longitudinal bone 3X is 75 degrees.

  Further, the plurality of diagonal bones 4M formed on the left side of the main vertical bone 3X are formed substantially parallel to each other, and the plurality of diagonal bones 4N formed on the right side of the main vertical bone 3X are substantially parallel to each other It is formed to be parallel. As described above, since they are substantially parallel to each other, the potential distribution can be made more uniform. The intervals between adjacent diagonal bones 4 may be the same, may be a plurality of intervals, or may be configured such that the intervals become larger as going downward. That is, the intervals of the diagonal bones 4 may be made different in order to make the potential distribution uniform.

  And as shown in Drawing 2 and Drawing 3, lattice 1 of this embodiment has a plurality of convex parts 31 formed by bending a plurality of vertical bones 3 in the lattice thickness direction. The lattice thickness direction is the vertical direction in the drawing of FIG.

  Specifically, the longitudinal bone 3 has a plurality of first convex portions 31 a that are convex on one side in the lattice thickness direction and a plurality of second convex portions 31 b that are convex on the other side in the lattice thickness direction. The first convex portions 31a and the second convex portions 31b are alternately formed. That is, each vertical bone 3 has a periodic shape pattern including one first convex portion 31 a and one second convex portion 31 b.

  The first convex portion 31 a and the second convex portion 31 b of the present embodiment have a curved shape smoothly curved along the lattice thickness direction so as not to have a bending point in the extending direction of the longitudinal bone 3, The bone 3 has a corrugated uneven shape as a whole. In addition, as shown in FIG. 4, it may be a multi-side shape configured of side elements that form a straight line in side view. That is, as shown in FIG. 4 (1), it may be a one-step convex shape consisting of three side elements forming a straight line, or as shown in FIG. 4 (2), seven straight lines are formed. It may be a two-step convex shape consisting of side elements.

  More specifically, each vertical bone 3 has a plurality of crossing portions 32 with a plurality of diagonal bones 4, and between the crossing portions 32 adjacent to each other, one of the first convex portion 31 a or the second convex portion 31 b One is formed. In addition, one of the first convex portion 31a or the second convex portion 31b is formed also between the connection portion between the longitudinal bone 3 and the first side portion 2a or the second side portion 2b and the crossing portion 32. ing. The first convex portion 31a and the second convex portion 31b of the present embodiment have a frame in a side view (right side view) viewed from one side (for example, the fourth side 2d) orthogonal to the first side 2a. It projects outside the bone 2.

  And in the grid 1 having the plurality of vertical bones 3 in which the first convex portion 31a and the second convex portion 31b are formed in this way, the side view shapes of the vertical bones 3 adjacent to each other are different from each other in the right side view Is configured.

  Specifically, the positions of the convex portions 31 (the first convex portion 31a and the second convex portion 31b) formed in the longitudinal bones 3 adjacent to each other are shifted along the extending direction (vertical direction) of the longitudinal bones 3 As a result, the side view shapes of the longitudinal bones 3 adjacent to each other are configured to be different from each other. That is, the shape pattern formed on each vertical bone 3 is shifted along the vertical direction. In addition, in the side view seen from the extension direction of the diagonal bone 4, if one longitudinal bone 3 of the longitudinal bones 3 adjacent to each other is the first convex portion 31a, the other longitudinal bone 3 is the second convex portion 31b. The phase of the shape pattern is shifted by 180 degrees.

Specifically, the longitudinal bone 3 on the left side of the main longitudinal bone 3X is as follows.
That is, in the longitudinal bone 3 which intersects with the first divided bone 4a in the diagonal bone 4M, the shape pattern of one longitudinal bone 3 and the shape pattern of the other longitudinal bone 3 in the longitudinal bones 3 adjacent to each other are The phase difference deviates at less than 180 degrees.
In the longitudinal bone 3 of the diagonal bone 4M that intersects with the second divided bone 4b, the shape pattern of one longitudinal bone 3 and the shape pattern of the other longitudinal bone 3 in the longitudinal bones 3 adjacent to each other are The phase difference is 180 degrees out of phase.
On the other hand, with regard to the longitudinal bone 3 on the left side of the main longitudinal bone 3X, the shape pattern of one longitudinal bone 3 in the adjacent longitudinal bones 3 and the shape pattern of the other longitudinal bone 3 have a phase difference of 180 degrees. It deviates in less than.

  The grid 1 of such a configuration is manufactured by punching a rolled sheet by punching and then press forming using a die. In addition, the lattice 1 may be manufactured by performing punching and press forming simultaneously.

  In the present embodiment, although the configuration in which the vertical bone 3 has the convex portion 31 has been described, in addition to the vertical bone 3, the diagonal bone 4 may be configured to have the convex portion formed by bending similarly. . In addition, instead of the longitudinal bone 3, only the oblique bone 4 may have a convex portion.

  Next, the result of a light load life test of a lead storage battery having a positive electrode plate configured using the lead storage battery grid according to the present invention will be shown.

  This test is a 40 ° C. light load life test (4 minutes discharge-10 minutes charge) in accordance with JIS D 5301. A comparative example of this test has a shape shown in FIG. 5 (1), and is a grid for a lead-acid battery in which neither the longitudinal bone nor the oblique bone is subjected to the concavo-convex processing. Moreover, an Example has a shape shown in FIG. 5 (2), what performed uneven processing to one part or all part of a longitudinal bone (Example 1 or Example 2), a part of diagonal bone, or One having all been subjected to concavo-convex processing (Example 3 or Example 4), and one having been subjected to concavo-convex processing on a part or all of both longitudinal bones and oblique bones (Example 5 or Example 6) . Here, as shown in (1) of FIG. 4, the shape of the convex portion formed by the concavo-convex process is a one-step convex shape having four bending points. Moreover, "a part" is a case where the bone to which the concavo-convex process is to be applied is skipped by one, and the "all" is a case where the bone to which the concavo-convex process is to be applied is all. The results of this test are shown below.

  As can be seen from Table 1, the number of life cycles is increased in all of Examples 1 to 6 in which the concavo-convex processing is performed, as compared with the conventional example in which the concavo-convex processing is not performed. Moreover, compared with the Example which carried out uneven | corrugated process to "a part", the Example which gave uneven process to "all" has many life cycle numbers more. Furthermore, the number of life cycles is greater in Examples 1 and 2 in which the vertical bone is roughened than in Examples 3 and 4 in which the uneven bone is roughened. In particular, it is understood that it is excellent from the viewpoint of charge and discharge cycle life performance to perform the concavo-convex processing on both the longitudinal bone and the oblique bone.

Next, the result of the overcharge corrosion test of a lead storage battery having a positive electrode plate configured using the lead storage battery grid according to the present invention will be shown.
In this test, an overcharge test was performed at 75 ° C. in a water tank at 0.1 CA for 28 days, the battery after the test was disassembled, and the number of broken grids was measured. A comparative example of this test has a shape shown in FIG. 5 (1), and is a grid for a lead-acid battery in which neither the longitudinal bone nor the oblique bone is subjected to the concavo-convex processing. Moreover, an Example has a shape shown to FIG. 5 (2), what carried out the uneven | corrugated process of the curved shape (wave form) to all of both a longitudinal bone and an oblique bone (Example 7), a longitudinal bone Of both vertical bone and diagonal bone subjected to one-step convex shape unevenness processing (Example 7), and both vertical bone and diagonal bone subjected to two-step convex shape unevenness processing (Example 8). The results of this test are shown below.

  As can be seen from Table 2, in order to improve charge-discharge cycle life performance, the concavo-convex shape is necessary, but as the concavo-convex shape, the shape with fewer bending points is the number of broken bones in the grid after the test. Few. That is, it can be seen that the smoother the machined shape, the smaller the residual stress applied to the bones of the lattice at the time of machining, and the less the bone breakage of the lattice after the overcharge corrosion test.

  According to the grid 1 according to the present embodiment configured as described above, since the plurality of vertical bones 3 have the convex portions 31 formed by bending in the grid thickness direction, at least one surface in the grid thickness direction The adhesion to the active material can be improved. Moreover, since the side view shapes of the vertical bones 3 adjacent to each other are different from each other, the active material filled in the lattice 1 is held so as to be enclosed between the convex portions 31 formed on the vertical bones 3 adjacent to each other. Even when the substance is softened, detachment of the active material from the lattice 1 can be suppressed. Thereby, the charge / discharge cycle life performance of the storage battery can be improved. In addition, when the active material is coated from only one side, the active material is coated by mounting the active material on the mounting surface with the convex portions 31 formed in the lattice thickness direction facing the mounting surface side. The active material can be easily introduced to the surface opposite to the work surface, and the fillability of the active material can also be improved.

  Further, since the first convex portions 31a and the second convex portions 31b are alternately formed on the longitudinal bone 3, the adhesion to the active material on both sides in the lattice thickness direction can be improved. Further, in the longitudinal bones 3 adjacent to each other, active between the first convex portion 31a formed on one longitudinal bone 3 and the second convex portion 31b formed on the other longitudinal bone 3, that is, from the lattice thickness direction Since the substance is held so as to be encased, removal of the active material from the lattice 1 can be further suppressed.

  Furthermore, since the lattice 1 of the present embodiment has the main longitudinal bone 3X below the ears 21, the distance between the ears 21 and the lower side 2b of the frame 2 can be shortened. Further, since there are a plurality of diagonal bones 4 extending obliquely downward from at least the main longitudinal bone 3X, the current generated at the side portion of the main longitudinal bone 3X shortens the path to the main longitudinal bone 3X or the ear 21. can do. Furthermore, since the plurality of diagonal bones 4 are formed in a substantially V shape centering on the main longitudinal bone 3X in plan view, the current generated on the left and right sides of the main longitudinal bone 3X can be 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. Moreover, since it has the frame bone 2 which makes a substantially rectangular shape, mechanical strength can be improved. Furthermore, it is possible to suppress the elongation of the grid 1 in the vertical direction and the lateral direction due to the displacement of the bending amount of the bent vertical bone 3 and the oblique bone 4.

  Moreover, by forming the grid 1 by punching, the thickness of the grid can be thinner (the weight of the grid can be lighter) as compared to the case where the grid 1 is formed by casting. Therefore, the cost can be reduced by reducing the number of grid materials. The reason for this difference in lattice thickness is the difference in the form of corrosion due to the difference in the metallographic structure. In general, the cast lattice has the property of breaking while the rate of corrosion is small, because the crystal grains are large and the corrosion proceeds so as to enter the grain boundaries. On the other hand, in a punched grid manufactured by punching a rolled sheet, large crystal grains in the slab are stretched in the rolling direction by rolling processing after slab preparation, and there are no grain boundaries that would break the grid, which causes corrosion. Has the property of proceeding in layers from the lattice surface. This property allows stamped grids made from rolled sheets to have a thinner grid thickness as compared to cast grids.

The present invention is not limited to the above embodiment.
For example, in the above-described embodiment, the longitudinal bones adjacent to each other have the same shape and have periodic patterns with the same shape, and the side view shapes are different from each other due to their different phases. The bones may have different shape patterns. For example, the length of the convex portion formed on one longitudinal bone and the convex portion formed on the other longitudinal bone along the extending direction of the longitudinal bone, the protruding length along the lattice thickness direction, Alternatively, bending shapes such as a curved shape and a convex shape may be different from each other.

  Further, the formation position of the convex portion in one longitudinal bone may be different from the formation position of the convex portion in the other longitudinal bone. For example, in one longitudinal bone, a convex portion may be formed between all the intersections, and in the other longitudinal bone, no convex portion may be formed between some of the intersections. Besides, in addition to forming one convex portion between the crossing portions adjacent to each other, two or more convex portions may be formed, or regardless of the intersecting portion, that is, it becomes a convex portion The crossing portion may be located at the longitudinal bone portion where it is located.

  In the said embodiment, although the convex part consisted of a 1st convex part and a 2nd convex part, you may have only one convex part.

  Moreover, although the said embodiment used and demonstrated the grid | lattice used for lead acid battery as an example, it is not restricted to this, It can apply to the grid | lattice with which an active material, such as a nickel hydrogen battery, is filled.

  Furthermore, in the said embodiment, although the grating | lattice 1 was formed by stamping and press forming, it may be formed by casting.

  In addition, although the lattice of the above embodiment is configured such that the upper side of the four sides of the frame is the first side and the lower side is the second side, the left and right sides of the four sides of the frame are included. One of them may be configured as a first side and the other as a second side.

  Moreover, although the lattice of the said embodiment was a frame bone which has four sides, the frame bone which has only one side of the 1st side 2a in which the ear part 21 was provided, the 1st side 2a, and the 2nd side It may be a frame having two sides such as one having only the upper and lower two sides of 2b.

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

Reference Signs List 1 grid 2 frame 2a upper side 2b lower side 21 ear 3 vertical bone (inner bone)
3X: Main vertical bone 31: Convex part 31a: First convex part 31b: Second convex part 32: Crossed part 4: Diagonal bone

Claims (8)

What is claimed is: 1. A battery grid comprising: a frame bone; and a plurality of inner bones connected to the frame bone,
The frame has a first side connected to the current collector and a second side opposite to the first side.
The plurality of inner bones are vertical bones connecting the first side and the second side,
Having a plurality of diagonal bones extending at an angle to said inner bone,
At least a part of the inner bone has one or more projections formed by bending in the lattice thickness direction,
The convex portion is state, and are not forming a curved curved shape such that it has no inflection point,
Wherein the plurality of oblique bone, one or more lead-acid batteries lattice that having a said convex portion formed by bending the grating thickness direction. Bone all provided in the frame in the bone, the lattice for a lead-acid battery of claim 1 are those having the convex portions. The convex portion of the inner bone has a first convex portion which is convex on one side in the lattice thickness direction, and a second convex portion which is convex on the other side of the lattice thickness direction. The grid | lattice for lead acid batteries as described in a claim | item 1 or 2 . The grid for a lead-acid battery according to claim 3 , wherein the first convex portion and the second convex portion are alternately formed in the inner bone. The grid for a lead-acid battery according to any one of claims 1 to 4 , wherein in a side view seen from a direction parallel to the first side portion, the shapes of side views of the inner bones adjacent to each other are different from each other. All of the inner bones have the plurality of projections,
The positions of the convex portions formed on the adjacent inner bones are shifted along the extension direction of the inner bones, so that the side view shapes of the adjacent inner bones are configured to be different from each other. A grid for a lead-acid battery according to claim 5 . The inner bone has a plurality of intersections with the oblique bone,
The grid for a lead-acid battery according to any one of claims 1 to 6 , wherein the convex portion is formed between the intersections adjacent to each other. A lead-acid battery using the grid for a lead-acid battery according to any one of claims 1 to 7 .