CN101567463A

CN101567463A - A storage battery, an expand grid and its making method

Info

Publication number: CN101567463A
Application number: CNA2009101415379A
Authority: CN
Inventors: 田中裕幸; 藤原义臣
Original assignee: Yuasa Battery Corp
Current assignee: GS Yuasa Corp; Yuasa Corp
Priority date: 2001-11-21
Filing date: 2002-11-21
Publication date: 2009-10-28
Also published as: CN101567464A

Abstract

A storage battery is provided in which an expand grid is improved with respect to the widths of grid wires 1b, the sectional areas of nodes 1e, and the shapes of meshes 1c, whereby the productivity of the expand grid can be enhanced and the life performance can be improved. As means for attaining the object, a storage battery in which an expand grid is used as a battery plate, the expand grid being a grid member which is formed by expanding a side portion of a collector frame portion 1a of a metal sheet 1 to connect a large number of grid wires 1b to one another in a net-like shape, is configured so that widths of grid wires 1b of a row which is directly connected to the collector frame portion 1a of the expand grid, and a lateral end row are larger than widths of grid wires 1b of at least one of intermediate rows. The invention also relates to a method for making the storage battery and related expand grid and its making method.

Description

Storage battery, expansion grid and preparation method thereof

The application is that to be called " storage battery ", the applying date be that November 21, application number in 2002 are dividing an application of 02151373.2 application for a patent for invention to name.

Technical field

The present invention relates to storage battery and preparation method thereof, wherein use the expansion grid as accumulator plate.In addition, the invention still further relates to expansion grid and preparation method thereof.

Background technology

Prepare to produce by expanding method sometimes as the grid of chloride plate.Method by expanding method production expansion grid roughly is divided into two kinds, that is, and and rotary process and reciprocal method.

In reciprocal method, the expansion grid is produced in the following manner.The dicer that stepwise is arranged is vertical moving on a metallic plate that moves intermittence, so that order forms the line of rabbet joint on metallic plate, then metallic plate being stretched, it is netted to form.Specifically, as shown in figure 11, the metallic plate 1 that lead or lead alloy are made moves on plane on the bottom workbench 2 in the direction of arrow F off and on.Scalariform side 2a forms on the side of bottom workbench 2 respectively.On the 2a of scalariform side, form a large amount of steps (for simplicity, 4 steps only draw among the figure), make distance between the side, along with the propelling on the direction of arrow F, below constant jump reduce towards central stepwise.Dicing knife 3 is installed on the upper stages 4, and upper stages is placed on the top of bottom workbench 2.In fact, upper stages 4 is placed on the position, and this position is lower than shown position, perhaps is located at the top of the metallic plate 1 that is transferred on the bottom workbench 2 slightly, and upper stages is carried out catenary motion on this position.The scalariform side 4a that is similar to the scalariform side 2a of bottom workbench 2 forms on the side of upper stages 4 respectively.Dicing knife 3 is separately fixed on the scalariform side 4a of upper stages 4, thereby the V-shaped substantially on the whole layout of dicing knife.In each dicing knife 3.Article one, blade 3a is outstanding downwards from the lower surface of upper stages 4.

When each intermittent movement stopped, upper stages 4 was fallen, so that carry out a catenary motion circulation, thereby the end of metallic plate 1 is by the blade 3a of dicing knife 3 cutting and stretch downwards, thereby formed expansion grid as shown in figure 12.That is to say that metallic plate 1 is processed to the grid that expands, wherein two sidepieces of the collection of in the central area of the Width frame 1a of portion are become with netted ruling 1b connected to one another by sequence stretching.The expansion grid has a large amount of mesh 1c, and each mesh is surrounded by 4 ruling 1b.Collect the frame 1a of portion and be metallic plate 1 do not form mesh 1c in case can be in accumulator plate the zone of collected current, and in order to be connected in the future a joint.Form a pole plate flange.Expansion grid shown in Figure 12 is made by an equipment, and in this equipment, with shown in Figure 11 different, 12 dicing knife 3 are installed on each side of upper stages 4.

In reciprocal working system, be to finish by a circulation of upper stages 4 catenary motions by dicing knife 3 cutting metal plates 1 with the operation that ruling 1b stretches, expansion forms mesh 1c.Therefore, in the carrying out of reciprocal working system, each mesh is formed rhombus, and four ruling 1b that surround mesh have identical length, thereby the stress in the process of stretching ruling 1b can be acted on line equably.As in the disclosed invention in the open text of Japan Patent SHO57-90873 number, in the reciprocal working system of another kind, each mesh 1c basically forms parallelogram, has the long limit and the minor face of different length.In this reciprocal working system, ruling 1b is by dicing knife 3 straight downward stretchings, thereby ruling 1b can not twist in expansion process.Therefore, the advantage of this method is that the grid that is used as accumulator plate shows fabulous life performance.

In the expansion grid, for example by single-point line L ₁Mesh 1c on the shown oblique line is formed by dicing knife 3 one strokes, the V-shaped substantially layout of described dicing knife 3.When metallic plate 1 because intermittent movement is transferred a preset distance, when upper stages 4 is carried out next time catenary motion, single-point line L ₂Shown in mesh 1c on the oblique line in one stroke, form.Therefore, in metallic plate 1, the mesh 1c in the lateral ends on Width at first is formed, and when each intermittent movement was further carried out, inner mesh 1c was formed in proper order.The blade 3a of dicing knife 3 is to pressing down two ruled line 1b, and this two ruled line is V-shaped substantially layout under relevant mesh 1c.Be arranged to a row to the ruling 1b that presses down along direction of advance F by same dicing knife 3, simultaneously with the staggered inclination of tortuous mode.

In the expansion grid of producing like this, as shown in figure 12, ruling 1b is connected to each other with netted collecting frame portion 1a both sides, and above-mentioned collection frame portion is that the central authorities on the Width of metallic plate 1 form.When preparation is used as accumulator plate with the expansion grid, collects the frame 1a of portion and be divided into two parts along the line of cut on the arrow F direction.Therefore, resulting, will expansion grid as accumulator plate in, be netted ruling 1b and be connected in a side of collecting the frame 1a of portion.In the reciprocal working system of expansion grid, because metallic plate 1 is carried off and on, throughput rate is lower.

In rotary process, the expansion grid is produced in the following manner.Form in the step at the line of rabbet joint, at first use a dise knife on metallic plate, to form a large amount of tortuous lines of rabbet joint.Then, in expansion step, metallic plate is inflated on Width, so that the line of rabbet joint is pulled into netted.That is, in the rotation working system, the expansion grid forms in the following manner.At first, form in the step at the line of rabbet joint shown in Figure 13, metallic plate 1 is process between the dise knife roller 6 of upper and lower part, thereby forms line of rabbet joint 1d, and each dise knife roller is made of folded a large amount of dise knifes 5.As shown in figure 14, each dise knife 5 is metal dish, in metal dish, is staggered to form many 5a of spine and the 5b of paddy portion on side face.In the peripheral part of dise knife 5, be respectively the 5b of paddy portion and form groove 5c, so that in the corresponding 5b of paddy portion, opened.But in each 5b of paddy portion, groove 5c only forms in preceding and rear surface, and in the adjacent 5b of paddy portion, groove 5c forms on the apparent surface of preceding and rear surface respectively.As shown in figure 15, each dise knife roller 6 is to constitute by stack a large amount of such dise knifes 5 by spacing body 7 on same.Upper and lower part dise knife roller 6 is placed on dise knife 5 and is moving axially on the position of half pitch, and the upper and lower part periphery is engaged with each other alternately.Upper and lower part dise knife roller 6 rotates synchronously with opposite direction, and its phase relation is that the 5a of spine of upper and lower part dise knife 5 and the 5b of paddy portion overlap each other and engage.

When metallic plate 1 between dise knife roller 6 through out-of-date, as shown in figure 13, dise knife 5 forms a large amount of line of rabbet joint 1a.In the 5b of paddy portion of the upper and lower part dise knife 5 that groove 5c faces with each other, the line of rabbet joint is interrupted, thereby is discontinuous along the direction of advance F of metallic plate 1, is interrupted but form with certain interval.In addition, the line of rabbet joint 1d of adjacent formation mobile half pitch on direction of advance F on metallic plate 1 Width, the line of rabbet joint forms in tortuous mode on the whole.Lametta shape between adjacent line of rabbet joint 1d partly constitutes ruling 1b, and line of rabbet joint 1d is along the interruption part configuration node 1e of direction of advance.

When line of rabbet joint 1d was formed by the 5a of spine of upper and lower part dise knife 5, because ruling 1b pressurized on direction up and down, thereby ruling 1b was by strain, so as from the forward and backward surface of the metallic plate 1 shown in Figure 16 (a) upwards, outstanding downwards.All a series of ruling 1b that arrange by node 1e along direction of advance F are for example made progress by the 5a of spine of the bottom dise knife 5 shown in Figure 16 (b) and oppress, thereby middle section forms teat P upwards.All a series of on direction of advance adjacent to the ruling 1b of metallic plate 1 by the 5a of spine of top dise knife 5 to lower compression, thereby middle section forms downward teat P.

In above-mentioned rotation working system, the line of rabbet joint is by metallic plate 1 process between the upper and lower of two vertical layouts dise knife roller 6 is formed.Perhaps, line of rabbet joint 1d also can form by making metallic plate 1 process between three or more dise knife rollers 6.

In expansion step shown in Figure 17, the metallic plate 1 that forms the line of rabbet joint 1 in a manner described stretches with the formation expansion grid that expands to the both sides of Width.In the expansion grid of a kind of practicality of producing with rotary process, as shown in figure 18, collect the frame 1a of portion and be arranged in the middle section on metallic plate 1 Width, the 1f of lower box portion is separately positioned in two lateral ends, is collecting between frame 1a of portion and the lower box portion with a large amount of mesh 1c of netted formation.In collecting frame 1a of portion and the 1f of lower box portion, do not form mesh 1c.Collecting plate flange of formation on the frame 1a of portion, this plate flange will be connected in a joint so that collected current.Each 1f of lower box portion is a part as the accumulator plate lower end in pole plate is placed on battery jar the time.As shown in figure 17, by the bloating plant 8 further horizontal 1f of lower box portion that draw, metallic plate 1 is inflated.Bloating plant 8 is a ring chain equipment, and it is placed to the fan shape that is formed on metallic plate 1 transport path both sides.The bonding part that is contained on the chain drive wheel engages with the 1f of lower box portion of the metallic plate 1 that is transferred, and makes metallic plate 1 by oblique outside stretching.Therefore, metallic plate 1 broad ways is pulled to lateral ends, gap between the line of rabbet joint 1d is broadened and forms the mesh 1c that assumes diamond in shape substantially, the four ruled line 1b that surround each mesh 1c, have an equal length are connected to each other with mesh shape, thereby form the expansion grid.The ruling 1b that is formed by the adjacent line of rabbet joint 1d of series is among the same row, and is distributed in when with the staggered inclination of tortuous mode along among the row of direction of advance F.

When the expansion grid of preparing to form like this was used as accumulator plate, the collection frame 1a of portion that is in the Width middle section was divided into two parts along a line of cut on the arrow F direction.Therefore, form like this, will expansion grid as accumulator plate in, be the cross side that netted ruling 1b is connected in the collection frame 1a of portion, the 1f of lower box portion is in the lateral ends of grid.

In the rotation working system, the formation of the line of rabbet joint and expansion are carried out when metallic plate is carried continuously.Therefore, the advantage of this method is that the speed of production expansion grid can be higher than the speed of reciprocal method.In reciprocal method, the expansion of cutting and ruling 1b is finished in one stroke, yet it is different therewith, the ruling 1b of metallic plate 1 in the rotary process since the line of rabbet joint form step and expansion step to be subjected to twice heavily stressed, form in the step at the line of rabbet joint, ruling 1b is out of shape on the either direction in up and down by the 5a of spine of dise knife 5, and in expansion step, then is stretched so that form mesh 1c.In addition, in expansion step, the reciprocal method of only being oppressed by dicing knife 3 on downward direction with ruling 1b is different, and ruling 1b is stretched by node 1e, is reversed simultaneously.Therefore, the stress that reverses also acts on the expansion grid.Therefore, the expansion grid that rotary process is produced also has a shortcoming to be, ruling 1b is easy to fracture in process of production, thereby has reduced output, has influence on life performance.

In two kinds of expansion grids producing with reciprocal method and rotary process, ruling 1b has the width of uniformity usually in each part.But, when this expansion grid was used as the positive plate of lead accumulator, the oxidation reaction of lead or lead alloy can appear in charging process, and reaction is carried out to such an extent that ruling 1b is ruptured because of oxide etch.When ruling 1b breaks, at this part active material in collecting the farther mesh 1c of the frame 1a of portion that breaks by electric insulation, thereby be difficult to charging or discharged.Therefore, when near the ruling 1b collecting the frame 1a of portion broke, relatively large active material was by electric insulation, thereby significantly reduced the capacity of accumulator plate.Traditionally,, take a kind of countermeasure sometimes, make the ruling in collecting the nearer row of the frame 1a of portion make bigger width in order to tackle this problem.As mentioned above, when the more close collection frame of the row of breaking portion, the influence of corrosion failure is bigger.That is to say, proposed following technology.In the open text SHO-66864 invention disclosed of Japanese Utility Model, in a part of expansion grid, form thicker ruling.In the open text HEI1-204364 invention disclosed of Japan Patent, the width of the ruling of expansion grid reduces gradually from upside to downside.In the open text HEI 9-223502 invention disclosed of Japan Patent, stipulated the thickness of ruling.

In the positive plate of the lead accumulator of long-life communication field of special requirement or similar field, use the expansion grid sometimes, the metallic plate 1 that wherein uses big thickness is so that thickening lattice silk 1b, thereby improves corrosion resistance, so that prevent the corrosion failure of ruling.

The problem to be solved in the present invention (1)

In rotary process with in two kinds of expansion grids that back and forth method is produced, when production expansion grid made ruling 1b have different in width, the less ruling 1b of width was easy to break, thereby causes the problem of reduction ability.To do more specifically to describe to this point.About the expansion grid that rotary process is produced, production process is included in the expansion step of Width stretched sheet metal 1.Therefore, depend on the position on the Width of metallic plate 1 when the ruling width, that is, row's position and when changing, the high stress in expansion step is at the little width of having of every ruling 1b, thereby on the low part of intensity.In addition, the tension stress that produces in the step of stretched sheet metal 1 at first acts on the ruling 1b of the row in collecting the frame 1a of portion lateral ends farthest.When the width of lateral ends row's this ruling 1b was less than or equal to other row's the width of ruling, ruling broke especially easily.About the expansion grid that reciprocal method is produced, mesh 1c forms from the extremely inboard order of the lateral ends of the collection frame 1a of the portion metallic plate 1 farthest from metallic plate 1 middle section.Therefore, when little width and low intensive ruling were arranged in the lateral ends, ruling 1b was broken by the vibration that the intermittent movement of the catenary motion of upper stages 4 or metallic plate 1 causes easily.

The problem to be solved in the present invention (2)

The rotation working system has production expansion grid velocity height, advantage that productivity ratio is high, but its problem be, when in order to improve corrosion resistance with metallic plate 1 system when thick, the possibility that will produce node 1e fracture or break.Specifically, when metallic plate 1 was thick, the cross-sectional area of ruling 1b just increased inevitably.Even when using soft metal such as lead or lead alloy, the rigidity of ruling 1b also can increase, thereby when ruling 1b stretched in stretching step, high action of pulling stress was on node 1e therefore.The cross-sectional area of ruling 1b is big more, and tension stress is high more.In reciprocal working system, ruling 1b is stretched from both sides in expansion step, thereby makes the tension stress that acts on the node 1e too high.Therefore, when using thick sheet metal 1, the expansion grid mostly is to adopt reciprocal method to produce.In fact, in the rotation working system, preferably use metal sheet 1.Therefore, the rotation working system often is used as in the pole plate of automobile lead accumulator produce preparing, and seldom in producing the expansion grid that used thickness is 1.0mm or bigger stereotype, or is 1.0mm at the cross-sectional area of producing ruling 1b ²Or be used in the bigger expansion grid.

When producing the expansion grid that uses thick sheet metal 1 with reciprocal method, caused problem is that the active material in accumulator plate in use reduces easily gradually.Specifically, when metallic plate 1 was thick, ruling 1b is thickening also.Therefore, in order to increase the capacity density of accumulator plate, the mesh 1c for preparing the injection active material must strengthen.In the expansion grid of producing with reciprocal method, ruling 1b is stretched as the crow flies by dicing knife 3, thereby the side surface of ruling 1b is made of the plane substantially, makes the adhesion of active material weakened easily.Therefore, in the expansion grid of producing by reciprocal method with thick sheet metal 1, the active material of inserting among the large-mesh 1c in use reduces easily gradually.Contrast, in the expansion grid of producing with rotary process, the stretched operation that the side surface of ruling 1b is inflated in the step is reversed into curved surface.Therefore, the adhesion of active material is enhanced, even thereby insert among the big mesh 1c at active material, active material also reduces not too easily gradually.

The problem to be solved in the present invention (3)

The rotation working system has expansion grid speed of production height, advantage that productivity ratio is high, but the problem that exists is that in expansion step, high-tensile strength only acts on a part of ruling 1b that surrounds each mesh 1c that assumes diamond in shape substantially, thereby ruling 1b is perishable, thereby reduces the life-span.In the expansion step of rotary process, as shown in figure 17, metallic plate 1 is stretched in transporting along direction of advance F.Therefore, as shown in figure 19, higher pulling force E acts on ruling 1b ₊On, described ruling 1b ₊Further when direction of advance is carried out more laterally (direction that in Figure 19, expands downwards) tilt.That is to say that when further carrying out, each mesh 1c is made bigger in expansion step on direction of advance F.Therefore, when each mesh 1c is out of shape by this way, downward-sloping ruling 1b to the right in Figure 19 ₊Accept higher pulling force E, be in abundant extended state, still, downward-sloping ruling 1b to the left _-Then be in the state of deflection slightly.When the expansion grid that uses this ruling 1b to go up the inhomogeneous state of working tension is produced storage battery as pole plate, have only the ruling 1b of acceptance than high-tensile strength E ₊Corrode at a relatively high speed, thereby reduced the life performance of storage battery.

Summary of the invention

Made the present invention in order to address the above problem.The purpose of this invention is to provide a kind of storage battery, wherein relevant with the shape of the cross-sectional area of the width of ruling, node and mesh, improve the expansion grid, thereby can improve the productivity ratio of expansion grid, and improved life performance.

The deal with problems measure of (1)

The invention provides a kind of storage battery, in this storage battery, use the expansion grid as pole plate, described expansion grid is the grid component that metallic plate forms, described grid component is that a sidepiece by the collection frame portion of the described metallic plate that expands is so that make many rulings form with netted being connected with each other, wherein: be directly connected in the width of row's ruling of the described collection frame portion of described expansion grid, and the width of an end row's opposite with described collection frame portion ruling is greater than the width of at least one row's ruling among the row of centre.

It is bigger that the ruling that is directly connected in the row who collects frame portion in above-mentioned storage battery is made width, so that be difficult to break, thereby can prevent the capacity of storage battery and significantly reduce owing to be connected in the corrosion failure of the ruling of collecting frame portion.In addition, owing to the ruling with respect to the transverse end row who collects frame portion, its width also makes bigger, so that be difficult to break, thereby can prevent to cause the production fault by the corrosion failure of end ruling in the expansion step of rotary process or reciprocal method.

In this expansion grid, three or more rows' ruling is arranged in the cross side of collecting frame portion.In the expansion grid of producing with rotary process, transverse end row's ruling is connected in another frame portion (lower box portion) different with collecting frame portion.Contrast, in the expansion grid that back and forth method is produced, grid ends at transverse end row's ruling usually.Frame portion is the not expansion area of metallic plate, and its width is to a certain extent or sufficiently greater than the width of ruling.Collecting frame portion is a frame portion that is used for from the ruling collected current, forms a plate flange thereon usually to be connected in joint.Form in the situation of rotary process of a frame portion in every side, a frame portion is as collecting frame portion.Ruling has the strip shape that forms by the cutting metal plate.Owing to expand, the ruling in every row is arranged and is able to the staggered inclination of tortuous mode.The tortuous ruling of many rows is connected to each other at the cross side of collecting frame portion, forms mesh shape.In rotary process with back and forth in the method, same row's ruling is by same dise knife or dicing knife processing, thus all rulings of same row width is identical each other usually.

The width of ruling is not equal to the thickness of metallic plate itself, but equal pitch (width) that metallic plate is rotated dise knife in the method or the back and forth dicing knife cutting in the method sometimes since the elongation of the ruling that expansion causes reduce.As shown in figure 20, when the sidepiece of the collection frame 1a of portion of metallic plate 1 be rotated method or back and forth method expand so that when forming netted continuous a large amount of ruling 1b, for example, the width of every ruling 1b also is not equal to length L t according to the thickness of metallic plate 1, but equals the length L w according to the cutting pitch.In Figure 20, the shape of expansion ruling 1b schematically is drawn as flat shape, so that do not distinguish between rotary process and reciprocal method.

In above-mentioned storage battery, be directly connected in the described row's of described collection frame portion the width maximum of ruling, the width of described end row's described ruling is less than the width of the described row's who is directly connected in described collection frame portion described ruling, and greater than at least one described in the middle of row's the width of ruling.

In a specific embodiment of storage battery of the present invention, have maximum width, thereby can prevent reliably that the corrosion failure that the life-span is had the greatest impact from use appearring in ruling owing to be directly connected in the ruling of collecting frame portion.In addition, owing to the ruling with respect to the transverse end row who collects frame portion, its width also makes bigger than centre row's ruling, so that be difficult to break, thereby can prevent because production fault reduction output.

In a specific embodiment of storage battery of the present invention, described maximum ruling width is not less than 1.2 times of minimum ruling width, and is not more than 1.6 times of minimum ruling width.Therefore, because the Breadth Maximum of ruling is not less than 1.2 times of minimum widith, thereby can be implemented in reliably to be directly connected among the row that collects frame portion and the transverse end row and increases the effect that the ruling width brings.When the width of all rulings increased, the speed of the expansion grid in the accumulator plate being filled active material excessively reduced, thereby can reduce the energy density of storage battery.Therefore, in the present invention, the width of middle row's ruling still keeps as much as possible little, so that prevent the decrease of power density.Because the Breadth Maximum of ruling is not more than 1.6 times of minimum widith, thereby can prevent that the ruling stand out from excessively strengthening, thus prevent rotary process or back and forth in the expansion step of method the weak ruling of less width be easy to the situation of breaking especially.

The measure of (2) is used to deal with problems

In a specific embodiment of storage battery of the present invention, described expansion grid is a grid component, this grid component is by form many rows of the line of rabbet joint that is interrupted at certain intervals on metallic plate, the interruption part of arranging the described line of rabbet joint in staggered mode, and the described metallic plate that stretches on Width is with the described metallic plate that expands, so that form with the netted ruling that is connected to each other by the described node that is interrupted the part formation, described ruling is that the line of rabbet joint adjacent one another are on Width constitutes, wherein: in each described node, be the twice of ruling cross-sectional area in cross section of each described ruling or more times along the node cross-sectional area of the maximum cross-section of a cut surface of the described line of rabbet joint, described cross section perpendicular to described ruling vertically.Therefore, with rotary process and back and forth the node cross-sectional area of each node in the expansion grid produced of method be the twice of ruling cross-sectional area of every ruling or more times.Even use thick sheet metal when be improving corrosion resistance, thus the ruling cross-sectional area is increased and high tension on node the time, also can prevent the node fracture or break.

As schematically illustrating near the shown in Figure 5 of the situation node of expansion grid, the node cross-sectional area Scon of node 1e is the cross-sectional area of maximum in cross section of the node 1e of the cut surface (cut surface of dise knife 5) along line of rabbet joint 1a.In Fig. 5, node 1e schematically is drawn as the hexagon of rule.In fact, node is that the 5b of paddy portion by upper and lower part dise knife 5 is pressed into, thereby has the shape of certain scalariform.Therefore, along in the area of section of the node 1e of cut surface maximum one be defined as node cross-sectional area Scon.The ruling cross-sectional area of ruling 1b be ruling 1b perpendicular to area of section longitudinally.

The present invention described in Fig. 5 is characterized in that: by having 70mm by described node with each mesh that the netted described ruling that is connected with each other surrounds ²Or bigger area.Therefore, even make improving corrosion resistance, and form and have 70mm when the expansion grid is to use thick sheet metal ²Or during more large-area large-mesh, ruling is also reversed in the expansion process of rotary process.Therefore, the adhesion of active material on mesh also can be enhanced, and reduces gradually from accumulator plate so that prevent active material.

In above-mentioned storage battery, described ruling cross-sectional area is not less than 1.0mm ², and be not more than 3.5mm ²In this storage battery, the cross-sectional area of ruling is 1.0mm ²Or bigger, and even the pulling force on acting on node when high especially, the node cross-sectional area can be set at 2.0mm ²Or it is bigger.Therefore, can prevent reliably that node from rupturing or breaking.Because the ruling cross-sectional area never surpasses 3.5mm ², thereby can prevent that also shortening from overcharging the life-span.

The measure of (3) is used to deal with problems

In a specific embodiment of storage battery of the present invention, described expansion grid is a grid component, this grid component is by form many lines of rabbet joint with interlace mode on metallic plate, and the described metallic plate that stretches on Width is so that expand into mesh with the line of rabbet joint, some meshes in the described mesh are surrounded by four rulings, wherein: relative in every ruling in described four rulings and described four rulings ruling has essentially identical length, the length of two relative rulings of described four rulings be not less than described four rulings other two relative rulings length 102% and be not more than 120%.Therefore, in this storage battery, owing to two relative rulings in the ruling that surrounds each mesh are longer than two relative rulings in addition, thereby mesh is the parallel quadrangle form on the long and short limit with different length substantially.Therefore, when acceptance was set to long limit than the ruling on the limit of high-tensile strength in the expansion step in rotary process, the pulling force that acts on the ruling of long limit was reduced, and the pulling force that acts on the minor face ruling is increased.Therefore, stress acts on four rulings that surround each mesh in relative uniformly mode, thereby can prevent the phenomenon that some ruling only easily is corroded, and can improve the life performance of storage battery.

In addition, the present invention also provides a kind of method for preparing storage battery, this method may further comprise the steps: a metallic plate is made a grid component and formed an expansion grid, and wherein a sidepiece of the collection frame portion by the described metallic plate that expands is so that make many rulings be connected with each other with netted; And with the pole plate of described expansion grid as storage battery, wherein make the width of row's ruling of the described collection frame portion that is directly connected in described expansion grid, and the width of an end row's opposite with described collection frame portion ruling is greater than the width of at least one row among the row of centre.

On the other hand, the present invention also provides a kind of storage battery, in this storage battery, use the expansion grid as pole plate, described expansion grid forms by metallic plate being made a grid component, in described grid component, a sidepiece of the collection frame portion by the described metallic plate that expands makes many rulings be connected with each other with netted, wherein:

Be directly connected in the width of row's ruling of the described collection frame portion of described expansion grid, and the width of row's ruling that is directly connected in the lower box portion relative with described collection frame portion is greater than the width of at least one row's ruling among the row of centre, and

Between described collection frame portion and described lower box portion, there is not frame portion.

In a specific embodiment of above-mentioned storage battery of the present invention, be directly connected in the described row's of described collection frame portion the width maximum of ruling, described row's the width of ruling that is directly connected in described lower box portion is less than the width of the described row's who is directly connected in described collection frame portion ruling, and greater than the width of at least one row's ruling among the row in the middle of described.

In a specific embodiment of above-mentioned storage battery of the present invention, described maximum ruling width is not less than 1.2 times of minimum ruling width, and is not more than 1.6 times of minimum ruling width.

In a specific embodiment of above-mentioned storage battery of the present invention, described expansion grid is by rotary process production.

On the other hand, the present invention also provides a kind of method for preparing storage battery, and this method may further comprise the steps:

Form an expansion grid by a metallic plate being made a grid component, wherein a sidepiece of the collection frame portion by the described metallic plate that expands makes ruling be connected with each other with netted;

With the pole plate of described expansion grid as storage battery, wherein be directly connected in the width of row's ruling of the described collection frame portion of described expansion grid, and the width of row's ruling that is directly connected in the lower box portion relative with described collection frame portion is greater than the width of at least one row's ruling among the row of centre, and

In a specific embodiment of said method of the present invention, be directly connected in the described row's of described collection frame portion the width maximum of ruling, described row's the width of ruling that is directly connected in described lower box portion is less than the width of the described row's who is directly connected in described collection frame portion ruling, and greater than the width of at least one row's ruling among the row in the middle of described.

In a specific embodiment of said method of the present invention, described maximum ruling width is not less than 1.2 times of minimum ruling width, and is not more than 1.6 times of minimum ruling width.

In a specific embodiment of said method of the present invention, comprise by rotary process and produce described expansion grid.

On the other hand, the present invention also provides a kind of expansion grid, and described expansion grid forms by metallic plate being made a grid component, in described grid component, a sidepiece of the collection frame portion by the described metallic plate that expands makes many rulings be connected with each other with netted, wherein:

On the other hand, the present invention also provides a kind of method for preparing the expansion grid, and this method may further comprise the steps:

Form the expansion grid by a metallic plate is made a grid component, wherein a sidepiece of the collection frame portion by the described metallic plate that expands makes ruling be connected with each other with netted,

Wherein be directly connected in the width of row's ruling of the described collection frame portion of described expansion grid, and the width of row's ruling that is directly connected in the lower box portion relative with described collection frame portion is greater than the width of at least one row's ruling among the row of centre, and

Description of drawings

Fig. 1 is the vertical profile front view along A-A line among Figure 13, the situation of expression dise knife varied in thickness;

Fig. 2 (a) is the plane graph of metallic plate, and wherein the line of rabbet joint is to use dise knife roller shown in Figure 1 to form, and Fig. 2 (b) is the plane graph of expansion grid, and this expansion grid is made by the expanding metal plate;

The stereogram signal face of land of Fig. 3 shows a step of production expansion grid, and wherein the installation steps of dicing knife are back and forth changing in the method;

Fig. 4 is the plane graph of expansion grid, and this expansion grid is to produce with reciprocal method shown in Figure 3;

The local amplification stereogram of Fig. 5 is represented with near the node of the expansion grid of rotary process production;

Fig. 6 is the local amplification view of expansion grid, and in this expansion grid, mesh is to expand into parallelogram with different long and short limits in the expansion step of rotary process;

The view of Fig. 7 is represented the variation with respect to the ruling width ratio of life-span and corrosion failure rate;

The view of Fig. 8 is represented the variation of life-span number of cycles with respect to the ruling cross-sectional area;

The view of Fig. 9 is represented the variation of corrosion failure rate with respect to the node cross-sectional area;

The view of Figure 10 is represented the minimizing speed of active material with respect to screening area;

The stereogram of Figure 11 is illustrated in the conventional art example step with reciprocal method production expansion grid;

The expansion grid that the plan representation of Figure 12 is produced with the reciprocal method of conventional art example;

The end view of Figure 13 represents to form with the rotary process of conventional art example the step of the line of rabbet joint of expansion grid;

The end view of Figure 14 (a) is illustrated in the conventional art example with rotary process and forms the dise knife that uses in the step of the line of rabbet joint of expansion grid, and Figure 14 (b) is the plane graph of B-B along the line, and Figure 14 (c) is near the local enlarged side view the line B-B;

Figure 15 is the vertical profile front view along A-A line among Figure 13, the expression conventional art;

Figure 16 (a) is the local enlarged side view of expansion grid, and the line of rabbet joint in this expansion grid is that the line of rabbet joint in the rotary process of conventional art example forms in the step and forms, and Figure 16 (b) is local amplification view;

The plan representation of Figure 17 in the conventional art example with the step of rotary process expansion expansion grid;

Figure 18 is the plane graph of expansion grid, and this expansion grid is produced with rotary process in the conventional art example;

Figure 19 is the local amplification view of expansion grid, and this expansion grid is in the conventional art example with in the expansion process in the rotary process expansion step;

Figure 20 is the local amplification stereogram of expansion grid.

Embodiment

The contrast accompanying drawing is described embodiments of the invention below.

Embodiments of the invention (1)

Fig. 1 to 4 represents the first embodiment of the present invention.Fig. 1 is the vertical profile front view of A-A line intercepting among Figure 13, the situation of expression dise knife varied in thickness, Fig. 2 (a) is the plane graph of metallic plate, on this sheet metal, form the line of rabbet joint with dise knife roller shown in Figure 1, Fig. 2 (b) is the plane graph of expansion grid, this expansion grid is made by the expanding metal plate, the stereogram signal face of land of Fig. 3 shows a step of production expansion grid, the installation steps of dicing knife are back and forth changing in the method in this step, Fig. 4 is the plane graph of expansion grid, and the expansion grid is to produce with reciprocal method shown in Figure 3.

In this embodiment, describe storage battery, in storage battery, use expansion grid by any production in rotary process and the reciprocal method.

In expansion grid shown in Figure 180, that produce with rotary process, and in expansion grid shown in Figure 12, that produce with reciprocal method, in the time of in corrosion failure appears near the ruling 1b that collects the frame 1a of portion, it is maximum that the capacity of the accumulator plate that the corrosion failure of ruling 1b causes descends.Therefore, ruling 1b is the closer to collecting frame portion, and preferably the width setup with ruling 1b must be big more, thereby be difficult to occur corrosion failure more.On the other hand, in expansion grid shown in Figure 180, that produce with rotary process, bigger tension stress acts in expansion step on the collection frame 1a of a portion end laterally far away, thereby this end is easy to break.In expansion grid shown in Figure 12, that produce with reciprocal method, the processing vibration that is caused by the intermittent movement of the catenary motion of dicing knife 3 or metallic plate 1 easily from the ruling 1b that collects the frame 1a of portion lateral ends farthest, that at first be stretched makes breaks.Therefore, preferably also increase near width with respect to the ruling 1b that collects the frame 1a of portion.Usually, collecting plate flange of formation on the frame 1a of portion, accumulator plate is contained in the battery jar, makes plate flange up.Therefore, in the expansion grid, preferably ruling is the closer to top or the bottom, and the width of ruling 1b just is set greatly more.Therefore, in best mode of the present invention, the ruling width near a row who collects frame portion that in use influences life performance is set maximumly, along with advancing to horizontal middle part, the ruling width reduces gradually, and along with advancing to the end sidelong from the middle part, the ruling width increases gradually.Only forming two kinds of rulings, or in the situation of bigger and less width ruling, can adopt a kind of structure, in this structure, only be directly connected in a row of collection frame portion, or near more two rows that collect frame portion, and arranging with respect to collecting one in the frame portion lateral ends, or have big width near more two rows' of this lateral ends rulings, and except above-mentioned row in the middle of the ruling arranged have width smaller.

Unless the stand out between ruling is set, making Breadth Maximum is at least 1.2 times of minimum widith, just can not fully reach the effect that prevents that ruling from breaking.But when setting dramatic difference between the ruling width, the intensity difference of the intensity of the ruling of big width and the ruling of less width is excessive, thereby makes the production fault often take place.Therefore, preferably maximum ruling width setup is become to be not more than 1.6 times of minimum ruling width.

Expansion grid of the present invention is made in the following manner.

In rotary process, the width of netted ruling can be according to row in the expansion grid, and the dise knife thickness that is placed on the part that the ruling width should increase by increase changes.When preparing to reduce the ruling width, the thickness that is placed on the dise knife in the appropriate section is reduced.

Contrast Fig. 1 describes the step that is formed on the line of rabbet joint in the expansion grid with the rotation working system below.As shown in figure 13, metallic plate 1 passes through between the dise knife roller 6 of vertical layout along direction of advance F, thereby forms the line of rabbet joint in metallic plate 1.In addition, in the situation of Fig. 1, according to the identical mode of the roller of dise knife shown in Figure 15, each dise knife roller 6 constitutes by spacing body 7 stacked a large amount of dise knifes 5 on same axle, above-mentioned spacing body 7 is used to form the gap between the dise knife 5.Therefore, the periphery of the dise knife 5 of upper and lower part dise knife roller 6 is engaged with each other, and forms the line of rabbet joint the front side from Fig. 1 assigns into metallic plate 1 between roller.The 5a of the spine compacting that the ruling 1b that is made of the gap between the adjacent line of rabbet joint of metallic plate 1 is formed on the side face of upper and lower part dise knife roller 5 is so that outstanding from the bottom and the upper face of metallic plate 1.

In dise knife roller 6, as shown in Figure 1, the dise knife 5 and the spacing body 7 that approach the collection frame 1a of portion (left side among the figure) of metallic plate 1 most have maximum thickness W ₁, spacing body 7 and the dise knife 5 of the most approaching next collection frame 1a of portion, and laterally from collect the frame 1a of portion farthest spacing body 7 and the dise knife 5 in the end on (right side among the figure) have the second maximum ga(u)ge W ₂, other dise knife 5 and other spacing body 7 have minimum thickness W ₃Adopt in the metallic plate 1 that the dise knife roller 6 of this structure forms at the line of rabbet joint, shown in Fig. 2 (a), approach to collect the width W between the line of rabbet joint of the 1a of frame portion most ₁Maximum approaches to collect between the line of rabbet joint of the 1a of frame portion at the next one most, and from the width W of collecting between the frame 1a of the portion line of rabbet joint farthest ₂Be second maximum, width W between other line of rabbet joint ₃Be minimum.When metallic plate 1 is inflated, shown in Fig. 2 (b), be directly connected in the row's who collects the frame 1a of portion ruling 1b width W ₁Maximum is connected in next row's of above-mentioned ruling 1b ruling 1b, and from the width W of the ruling 1b that collects the frame 1a of portion row farthest ₂Be second maximum, the width W of other row's ruling 1b ₃Minimum.In Fig. 1 and 2, between the line of rabbet joint, reach exaggerative the drawing of difference of the width of ruling 1b, so that diagram.In Fig. 2 (b), above-mentioned width has drawn to such an extent that ignore following phenomenon: because the extension in expansion process, the width of ruling 1b is reduced.

In the production method shown in Figure 13 and 1, use two the dise knife rollers 6 in upper and lower.In addition, in the situation of using three or more dise knife rollers 6, can change the width of ruling 1b by the thickness of regulating dise knife 5 and spacing body 7 similarly.

In above-mentioned rotation working system, the expansion shown in Fig. 2 (b) be the collection frame 1a of portion by Fig. 2 (a) metallic plate that is shown in 1 when being fixed further outwards the 1f of lower box portion in the pulling lateral ends (end portion among Fig. 2) carry out.Therefore, in have the low situation of little width, intensity near the ruling 1b of the 1f of lower box portion, cause the possibility that ruling 1b breaks.This phenomenon is not limited to the ruling 1b near the 1f of lower box portion, also occurs in basic similarly mode near the ruling 1b that collects the frame 1a of portion.In addition, when the pulling direction is converse, in expansion process, the possibility that exists the ruling 1b in two lateral ends to break.

In reciprocal method, expansion is that the catenary motion by a plurality of dicing knife carries out, and described dicing knife is arranged in the scalariform mode above the metallic plate that intermittently moves.Therefore, when the jump of two dicing knife increased, the width of the ruling of respective row can be strengthened.

Contrast Fig. 3 describes an example with reciprocal method production expansion grid below.According to the mode identical with the situation of Figure 11, metallic plate 1 is sent to off and on along direction of advance F.Place and each side of the bottom workbench 2 of transferring metal plate 1 on formation a plurality of scalariforms side 2a (four steps in the drawings only draw).Upper stages 4 is arranged on the top of bottom workbench 2.According to the mode identical with bottom workbench 2, upper stages 4 is provided with a plurality of scalariforms side 4a on each side.Dicing knife 3 with the blade 3a that is used for expansion process is installed in the scalariform side 4a of upper stages respectively.The size gap that metallic plate 1 can be passed through forms between upper stages 4 and bottom workbench 2.Upper stages 4 repeats catenary motion according to the intermittent movement of metallic plate 1.Because the catenary motion of upper stages 4, the blade 3a of dicing knife 3 forms the line of rabbet joint in metallic plate 1, and the line of rabbet joint stretched downwards forms netted ruling.Inwardly place the minimum level of the scalariform side 2a of a step from the Breadth Maximum part of bottom workbench 2 corresponding to the expansion grid.

In this embodiment, bigger jump is arranged among the

scalariform side

4a and 2a of upper and lower workbench 4 and 2.Specifically, see also Fig. 3, at the scalariform side 4a that outermost dicing knife 3 is housed with jump between the scalariform side 4a of next inner dicing knife 3 is housed greater than other jump.Ruling width corresponding to big jump makes bigger by the production equipment that adopts this structure.When in such jump is being equipped with the upper and lower workbench 4 and 2 of actual production equipment of a large amount of dicing knife 3, forming, the width W of any row's ruling 1b ₂Can be made width W greater than other row's ruling 1b ₃, for example, as shown in Figure 4.By according to the identical mode of rotary process shown in Fig. 2 (b), the row who suitably selects to prepare to strengthen ruling 1b width can only increase near the row who collects the frame 1a of portion and away from the width of the row's who collects frame portion ruling 1b.

Embodiments of the invention (2)

Fig. 5 represents the second embodiment of the present invention, and this figure is local amplification stereogram, near the node of the expansion grid that expression is produced by rotary process.

In this embodiment, expansion grid that use produces by the rotary process storage battery as accumulator plate will be described.

The enlarged diagram of Fig. 5 represent the expansion grid that rotary process is produced node 1e near.In the expansion grid of this embodiment, as cross section and the maximum cross-sectional area along the node 1e of line of rabbet joint 1d cut surface, the node cross-sectional area Scon of node 1e is set to perpendicular to the twice of the ruling cross-sectional area S in the cross section of ruling 1b longitudinally or more times.According to this configuration, can prevent node 1e distortion, rupture or break by pulling force, above-mentioned pulling force be that ruling 1b produces when both sides are stretched in the expansion step of rotary process.Even ought formation have 70mm ²Or during more large-area mesh, in the process that stretches to both sides in the expansion step of rotary process, ruling 1b also can be reversed.Therefore, the adhesion of active material is better than the adhesion in the expansion grid that reciprocal method side that produce, ruling 1b forms the plane, thereby can prevent coming off from accumulator plate.But when the area of mesh was excessive, a large amount of active materials can come off in the production stage in batch production process.Therefore, preferably screening area is set for and be not more than 150mm ²

In the expansion grid of producing with the rotary process of conventional art, distortion, fracture, corrosion failure or similar fault are easy to occur near the join domain of node 1e and ruling 1b.When the ruling cross-sectional area S of every ruling 1b sets to such an extent that be not less than 1.0mm ²The time, above-mentioned fault can be prevented reliably.But, considering when overcharging the life-span (overcharge life), preferably ruling cross-sectional area S is set to such an extent that be not more than 3.5mm ²

Embodiments of the invention (3)

Fig. 6 represents the third embodiment of the present invention, and this figure is local amplification view, expression expansion grid, and wherein mesh is inflated the flat shape quadrangle that becomes to have different long and short limits in the expansion step of rotary process.

Also will describe a kind of storage battery in this embodiment, and wherein use the expansion grid of producing by rotary process as accumulator plate.

As shown in Figure 6, the mesh 1c of the expansion grid of producing with rotary process has the shape of basic parallelogram except being substantially triangular in shape adjacent to those that collect the frame 1a of portion.That is to say that each mesh 1c is made of four node 1e and four ruling 1b, four node 1e are on the summit of parallelogram, and four ruling 1b are connected with each other by node 1e.

As shown in figure 18, each mesh 1c of traditional expansion grid of producing with rotary process is the parallelogram on the limit with equal length substantially, perhaps assumes diamond in shape substantially.Therefore, length is about equally each other for four ruling 1b that surround mesh 1c.Yet as shown in Figure 6, each mesh 1c is the parallelogram on the long and short limit with different length substantially in the present embodiment.In surrounding four ruling 1b of mesh 1c, along with the propelling on the direction of advance F of metallic plate 1, (among Fig. 6, downward expansion direction) two ruling 1b tilting more laterally ₊Make longer, along with (in Fig. 6) the two ruling 1b tilting to the inside of the propelling on direction of advance F towards the collection frame 1a of portion of upside _-Make shorter.Long ruling 1b ₊Form to such an extent that have and be not less than shorter ruling 1b _-Length 102%.And be not more than 120% length of this length.

The ruling that surrounds each mesh 1c has the expansion grid of different length can be by rotary process production, sets each second 5a of spine of dise knife for example shown in Figure 14 5 to such an extent that have a bigger overhang towards outer circumferential side (circumferential lengths along the outstanding shape of spine 5 is increased).The 5a of spine is outstanding with identical amount in traditional dise knife 5, when forming line of rabbet joint 1d with this traditional dise knife 5, is suppressed to such an extent that have identical length at the ruling 1b of the outstanding distortion of direction up and down by the 5a of spine, shown in Figure 16 (a).For this, the ruling 1b that the 5a of spine of the big overhang of quilt suppresses is being given prominence to distortion on the direction up and down in large quantities, and as the result who is out of shape, is elongated.When the metallic plate 1 that forms step when the line of rabbet joint that bears aforesaid way was inflated in expansion step, the mesh 1c that is surrounded by the ruling of different length was formed the parallelogram shape on the long and short limit with different length, as shown in Figure 6.In this case, longer ruling 1b ₊Be set along with in the further propelling of the direction of advance F of metallic plate 1 and tilt towards the outside more.

In the expansion grid that constitutes like this, though longer ruling 1b ₊The line of rabbet joint in rotary process forms distortion in large quantities in the step, and still, longer ruling can avoid accepting high pulling force in expansion step, and this is because longer ruling stretches through a large amount of.Therefore, can make two longer ruling 1b that surround each mesh 1c ₊With two shorter ruling 1b _-In line of rabbet joint formation and expansion step, accept the basic stress that equates.

Longer ruling 1b ₊Length and shorter ruling 1b _-The expansion grid of the various ratios of length produced and studied.Therefore, have been found that when length ratio and be not less than 102% and when being not more than 120%, all ruling 1b are corroded on effectively preventing.This is owing to following reason.When length ratio less than 102% the time, compare with the expansion grid that traditional rotary process is produced, not significantly difference, unbalanced pulling force makes corrosion only at longer ruling 1b in expansion step ₊In take place, when length ratio greater than 120% the time, the expansion grid expands insufficient in expansion step, forms a kind of longer ruling 1b ₊The state that fluffs.In addition, as longer ruling 1b ₊Length be not less than 106% and be not more than at 115% o'clock, at longer ruling 1b ₊In the corrosion development and at shorter ruling 1b _-Difference between the development of middle corrosion can become very little.

(example 1)

Example 1 is the example of first embodiment, show the comparison between following two kinds of situations, first kind of situation is to be directly connected in from the ruling 1b of the collection frame 1a of portion of the metallic plate 1 shown in Figure 2 1f of lower box portion farthest to be configured to have minimum width, and second kind of situation is that described ruling is configured to have big width.

In example 1, Pb-0.06wt% Ca-1.0wt% Sn alloy sheets is processed to the grid that expands with the rotation working system.When rotating the dise knife of decompressor and the thickness of spacing body by appropriate change, set for when having minimum widith being directly connected in from that row's who collects the frame 1a of portion lower frame farthest ruling 1b, in expansion step, the connecting portion of ruling 1b and the 1f of lower box portion 10% in observe corrosion failure.Contrast, when that row's who is directly connected in the 1f of lower box portion ruling 1b be configured to have than other or during width that middle row's ruling 1b is wide, the corrosion failure rate in expansion step in the connecting portion of ruling 1b and the 1f of lower box portion reduces to about 2%.

Use reciprocal working system to carry out similar test.In this case, also according to the identical mode of situation of rotation working system, when the ruling 1b that collects the frame 1a of portion that row farthest is configured to have minimum widith, in expansion step, in about 6% ruling, observe corrosion failure.Contrast, when described ruling width increased, the corrosion failure rate in expansion step reduced to about 1%.

(example 2)

Example 2 is examples of first embodiment, shows the comparison between following two kinds of situations.First kind of situation is that the ruling 1b that is directly connected in the collection frame 1a of portion of metallic plate 1 shown in Figure 2 is configured to have minimum width, and second kind of situation is that described ruling is configured to have big width.

In example 2, also use the rotation working system that Pb-0.6wt% Ca-1.0wt%Sn is closed

The gold plate is processed into the expansion grid.The anode active material of the lead accumulator of Sheng Chaning is received in the expansion grid of rotation working system production in due form, then, grid is solidified (cured) and drying.To form the positive plate of lead accumulator.The cathode active material of the lead accumulator of Sheng Chaning is received in the identical expansion grid in due form, then, grid is solidified and drying, to form the negative plate of lead accumulator.

Positive and negative like this pole plate, then, is connected with each other the pole plate of identical polar by the separator interfolded of microporous polyethylene body plan by mainly, forms the pole plate group.This pole plate group is inserted into battery jar, the dilute sulfuric acid electrolyte of a certain amount of predetermined proportion is poured in the battery jar, thereby formation is according to the 75D26 type lead accumulator of JIS.

In this example, also the thickness of dise knife by changing the rotation decompressor and spacing body is produced the expansion grid of various ruling width.

75D26 type lead accumulator has carried out an overcharge test at 75 ℃, and (one of them cycle sets is the charging voltage (limiting current 25A) of 13.8V, 117 hours charging intervals.49 hours standing times, discharging current 200A becomes 3.0V or finishes when lower at 2 seconds voltage of discharge).

When the ruling 1b that is directly connected in that row who collects the frame 1a of portion sets to such an extent that have minimum widith, judge that in early days battery life exhausts, the lead accumulator that the life-span exhausts is opened, and has observed the state of positive plate.As a result, collect the frame 1a of portion and be directly connected in the ruling 1b heavy corrosion of collecting the frame 1a of portion, on the pole plate of heavy corrosion, ruling 1b separates with the collection frame 1a of portion fully.

When the ruling 1b that is directly connected in that row who collects the frame 1a of portion was configured to have big width, above-mentioned phenomenon did not take place, because ruling has big width, life performance is better.Also set for when big when the width of that row's contiguous with being directly connected in the row that collects the frame 1a of portion ruling 1b, life performance further improves.

On the grid that uses reciprocal working system production, also carried out similarly testing with above-mentioned test.The result of test is identical with result of the test in the situation of rotating working system.

(example 3)

Example 3 is examples of first embodiment, shows that the comparison of the expansion grid of various variations takes place for the wideest ruling width and the ratio of the narrowest ruling width.

In example 3, Pb-0.6wt% Ca-1.0wt% Sn alloy sheets also is processed into the expansion grid with the rotation working system.The anode active material of the lead accumulator of producing according to common mode is received in the expansion grid that the rotation working system produces, and then grid is solidified, drying, forms the positive plate of lead accumulator.The cathode active material of the lead accumulator of producing according to common mode is received in identical expansion grid, then grid is solidified, drying, forms the negative plate of lead accumulator.

By the separator interfolded of microporous polyethylene body plan, the pole plate with identical polar is connected with each other to form the pole plate group this positive and negative pole plate then by mainly.This pole plate group is inserted battery jar, pour the dilute sulfuric acid electrolyte of a certain amount of predetermined proportion into battery jar, thereby make 75D26 type lead accumulator according to JIS.

75D26 type lead accumulator bears overcharge test under 75 ℃ (one of them cycle sets is charging voltage 13.8V (limiting current 25A), 117 hours charging intervals, 49 hours standing times and discharging current 25A, becomes 3.0V or finishes when lower at 2 seconds voltage).In the expansion grid, have Breadth Maximum near two rows' that collect frame portion rulings, two rows' of next the most close collection frame portion rulings have second Breadth Maximum, have minimum widith farthest and near two rows' of lower box portion rulings from collecting frame portion.

Fig. 7 represents result of the test.In Fig. 7, the ratio of abscissa the wideest ruling width of representative and the narrowest ruling width, ordinate representative is with respect to using all rulings to have the life performance ratio that is set at 100 life performances of lead accumulator of the expansion grid of same widths, and in production expansion grid the corrosion failure rate.As shown in Figure 7, in the lead accumulator that uses Fig. 3 expansion of structure grid, the ruling width is big more, and life performance is improved significantly more, and still, when ruling width ratio during greater than 1.6 times, the corrosion failure rate in expansion grid production process also increases suddenly.Its reason is following phenomenon: in expansion grid expansion process, the ruling of big width is difficult to stretch, and the ruling of less width is easier to stretch, thereby the stress that produces in expansion step concentrates on the ruling of less width.

On the expansion grid of back and forth working system production, carried out similarly testing with above-mentioned test.Result of the test is identical with the result of the test of the situation of rotation working system.

In storage battery except that lead accumulator, that positive electrode current collector is corroded, also obtained similar result.

(example 4)

Example 4 is examples of second embodiment.In this example, the life-span of overcharging of the expansion grid of when the ruling cross-sectional area of the ruling 1b that changes each expansion grid rotary process being produced investigates.

In a kind of method of using rotary process production expansion grid, can change the thickness of ruling 1b by the thickness that changes metallic plate 1, by changing the width that the thickness that forms the dise knife 5 that uses in the step at the line of rabbet joint can change ruling 1b.The dise knife 5 that has prepared many groups different-thickness.When suitably changing the dise knife group each other, and when having changed the thickness of metallic plate 1, produced the cross-sectional area S of ruling 1b from 0.64mm by rotary process ²(thickness: 0.8mm * width 0.8mm) is to 4.0mm ²The expansion grid of (thickness: 2.0mm * width 2.0mm).The expansion grid is mutually the same aspect weight and external dimensions.After active material was inserted the expansion grid, the expansion grid was cured, drying, to form positive plate.

The positive plate of different ruling cross-sectional area S and with the negative plate of produced in conventional processes with mainly by the separator combination of microporous polyethylene body plan, the lead accumulator of the 55D23 type of using with the production automobile (the JIS D of Japanese Industrial Standards 5301).Lead accumulator is poured and made to the dilute sulfuric acid of a certain amount of predetermined proportion into.This lead accumulator has been carried out overcharge life-test (according to the test method of JIS D5301).

Fig. 8 is illustrated in the relation between ruling cross-sectional area S and life-span number of cycles in the overcharge life-test.As shown in Figure 8, when the ruling cross-sectional area S of ruling 1b less than 1.0mm ²The time, the life of storage battery exhausts in early days owing to the corrosion of grid, and still, S is not less than 1.0mm when the ruling cross-sectional area ²The time, the life-span number of cycles obviously shows the tendency that greatly and further increases with the cross-sectional area change.When ruling cross-sectional area S greater than 3.0mm ²The time, it is big that mesh size becomes, thereby active material is softened and comes off, thus the life-span number of cycles begins to reduce.Therefore, preferably ruling cross-sectional area S is set to such an extent that be not more than 3.5mm ²

(example 5)

Example 5 is examples of second embodiment.In this example,, when changing the node cross-sectional area Scon of node 1e, investigated its corrosion failure rate by rotary process expansion grid that produce, that have the cross-sectional area S of different ruling 1b.

In the method with rotary process production expansion grid, each node 1e can change by the 5b of paddy portion of the dise knife 5 of change in line of rabbet joint formation step and the width of groove 5c in the length on the direction of line of rabbet joint 1d.Therefore, prepared many groups paddy 5b of portion dise knife 5 different with the width of groove 5c, then, when suitably replacing the dise knife group each other, and when changing the ruling cross-sectional area S of ruling 1b by the method for example 4 by rotary process production expansion grid.In this case, in order to compare, the length of the 4a of spine on circumference of dise knife 5 always remains unchanged, thereby the longitudinal length of ruling 1b is equal to each other.

For different several ruling cross-sectional area S each, when changing node cross-sectional area Scon, investigated the mode that the corrosion failure rate changes.Fig. 9 represents the ratio of node cross-sectional area Scon and ruling cross-sectional area S and the result that uses various ruling cross-sectional area S to do to investigate as the relation between the corrosion failure rate of parameter.As shown in the figure, for any ruling cross-sectional area S, when node cross-sectional area Scon was not less than two times (2S) of ruling cross-sectional area, the corrosion failure rate was reduced reliably.S is not less than 1.0mm when the ruling cross-sectional area ²The time, be not less than in the situation of two times (2S) at node cross-sectional area Scon, the corrosion failure rate reduce to become very remarkable.

(example 6)

Example 6 is examples of second embodiment.In this example, investigated the expulsion rate of the active material of the expansion grid of inserting reciprocal method and rotary process production.

Prepared the expansion grid that many groups of a plurality of weight and ruling cross-sectional area S are equal to each other with reciprocal method and rotary process.In these expansion grids, each mesh has 50mm ²To 225mm ²The area of scope.After active material was inserted the expansion grid, the expansion grid was cured, drying, to form positive plate.Positive plate and negative plate and the main lead accumulator of using 55D23 type (JISD of Japanese Industrial Standards 5301) by the separator combination of microporous polyethylene body plan with the production automobile by produced in conventional processes.The dilute sulfuric acid of a certain amount of predetermined proportion is poured into, and finishes the body plan of storage battery.This lead accumulator has been carried out underload life test (according to the test method of JIS D 5301).Life test is interrupted at 3000 circulation times.Pole plate is removed and horizontal positioned.Investigated the expulsion rate (number of the mesh that comes off/mesh sum) of active material thereafter.

Figure 10 is illustrated in the finding to concerning between screening area and the active material expulsion rate in reciprocal method and two kinds of situations of rotary process.Found that, in the expansion grid that back and forth method is produced, when screening area is not less than 70mm ²The time, active material comes off with higher rate.By contrast proof, in the expansion grid that rotary process is produced, expulsion rate is expulsion rate only about half of in the expansion grid produced of reciprocal method, that is, the expulsion rate of active material significantly reduces.

(example 7)

Example 7 is examples of the 3rd embodiment.In this example, investigated longer ruling 1b in the ruling of each mesh 1c in the expansion grid ₊Be changed to 130% the situation ratio of the etching extent of two kinds of ruling 1b from 100%.

Prepared many groups dise knife, all 5a of spine of dise knife 5 wherein shown in Figure 14 have identical overhang, and have prepared the dise knife that has a bigger overhang every a 5a of spine.Use above-mentioned dise knife assembling to join dise knife roller 6 respectively.Use every kind of dise knife roller 6 to form and in metallic plate 1, form line of rabbet joint 1d in the step at the line of rabbet joint.Metallic plate is expanded with production expansion grid.The result in the expansion grid of being produced, in the ruling that surrounds each mesh 1c, two longer ruling 1b ₊Length range be two shorter ruling 1b _-Length 100% to 130%.All expansion grids have identical size: length 115mm, width 137mm, thickness 0.9mm.The size of mesh is conditioned, and even when the alteration of form of mesh 1c, the weight of expansion grid also is constant substantially.

Active material is received in all the expansion grids with difformity mesh 1c.Thereafter, the expansion grid drying that is cured is to form positive plate.This positive plate and with the negative plate of produced in conventional processes with mainly by the separator combination of microporous polyethylene body plan, be used for the 55D23 type lead accumulator (the JIS D of Japanese Industrial Standards 5301) of automobile with production.The dilute sulfuric acid of a certain amount of predetermined proportion is introduced into, and finishes the body plan of lead accumulator.Make lead accumulator bear overcharge test, storage battery is placed in 60 ℃ the water pot in test, then with 4.8A charging 30 days.After overcharge test was finished, lead accumulator was opened, and took out positive plate.Wash positive plate well with running water, in 50 ℃ gas phase dry 48 hours then.Use epoxy resin impregnated positive plate thereafter.Epoxy resin is cut, and cutting surface is by mirror finish, and the size of grid is measured the size of grid under stereoscope, so that obtain etching extent.

Following table 1 expression result of the test.

The length ratio of longer ruling and shorter ruling	Etching extent ratio (longer ruling: shorter ruling)	Remarks
The length ratio of longer ruling and shorter ruling	Etching extent ratio (longer ruling: shorter ruling)	Remarks	100％	65∶35	Conventional example
102％	58∶42	Example	100％	65∶35	Conventional example
102％	58∶42	Example	106％	54∶46	Example
110％	51∶49	Example	106％	54∶46	Example
110％	51∶49	Example	115％	43∶57	Example
120％	40∶60	Example	115％	43∶57	Example
120％	40∶60	Example	130％	-	Fault

Shown in top table 1, as ruling 1b _-And 1b ₊When having equal length (length ratio is 100%), etching extent is two times that 65: 35 or big etching extent are approximately less etching extent.Contrast is as ruling 1b ₊Be extended when realizing from 102% to 120% ratio, the difference between the etching extent reduces, and minimum in 110% situation.As ruling 1b ₊And 1b _-Corrosion when carrying out with different speed, the ruling 1b of corrosion stands corrosion failure in early days earlier.Contrast, in the situation of no etching extent difference, corrosion is carried out substantially in an identical manner, thereby can realize the longest life-span.Therefore, in order fully to improve the life-span, preferably further with ruling 1b ₊Length setting in 106% to 115% scope, the difference between the etching extent can be suppressed to 15% or littler shown in the table 1 thereby make.But, at ruling 1b ₊Length be 130% or when longer, in expansion step, the insufficient expansion of ruling is to produce long ruling 1b ₊Relaxed state, thereby the thickness of grid is greater than predetermined value.Therefore, this expansion grid does not bear overcharge test.

Except these examples, when the size that changes the expansion grid, the size of mesh 1c, the alloy composition of metallic plate 1, proportion of electrolyte or the like have also carried out similar test.In all these tests, all obtained and the essentially identical result of above-mentioned example.

From top description as can be seen, storage battery according to first embodiment of the invention, the width of the ruling of expansion grid is changed, thereby can improve the corrosion resistance and the productivity ratio of the accumulator plate that uses the expansion grid, thereby can improve the life performance of storage battery.

According to second embodiment, even in the expansion grid of producing with thick sheet metal by rotary process, can prevent also that by the cross-sectional area that increases node node from suffering corrosion failure.The expansion grid is produced with rotary process.Therefore, even work as and use thick sheet metal, mesh can prevent that also active material from coming off when enlarging.

According to the 3rd embodiment, the length that centers on four rulings of each mesh in the expansion grid of producing with rotary process is changed, thereby corrosion is carried out in basic mode uniformly, thereby can be improved the life performance of expansion grid as the storage battery of accumulator plate.

Claims

1. storage battery, in this storage battery, use the expansion grid as pole plate, described expansion grid forms by metallic plate being made a grid component, in described grid component, a sidepiece of the collection frame portion by the described metallic plate that expands makes many rulings be connected with each other with netted, wherein:

2. storage battery as claimed in claim 1, it is characterized in that: the width maximum of ruling that is directly connected in the described row of described collection frame portion, described row's the width of ruling that is directly connected in described lower box portion is less than the width of the described row's who is directly connected in described collection frame portion ruling, and greater than the width of at least one row's ruling among the row in the middle of described.

3. storage battery as claimed in claim 1 or 2 is characterized in that: described maximum ruling width is not less than 1.2 times of minimum ruling width, and is not more than 1.6 times of minimum ruling width.

4. storage battery as claimed in claim 1 or 2 is characterized in that: described expansion grid is by rotary process production.

5. method for preparing storage battery, this method may further comprise the steps:

6. the method for preparing storage battery as claimed in claim 5, it is characterized in that: the width maximum of ruling that is directly connected in the described row of described collection frame portion, described row's the width of ruling that is directly connected in described lower box portion is less than the width of the described row's who is directly connected in described collection frame portion ruling, and greater than the width of at least one row's ruling among the row in the middle of described.

7. as claim 5 or the 6 described methods that prepare storage battery, it is characterized in that: described maximum ruling width is not less than 1.2 times of minimum ruling width, and is not more than 1.6 times of minimum ruling width.

8. as claim 5 or the 6 described methods that prepare storage battery, comprise by rotary process and produce described expansion grid.

9. expansion grid, described expansion grid forms by metallic plate being made a grid component, and in described grid component, a sidepiece of the collection frame portion by the described metallic plate that expands makes many rulings be connected with each other with netted, wherein:

10. method for preparing the expansion grid, this method may further comprise the steps: