CN100338797C

CN100338797C - Method for producing copper sheet grating of lead acid battery, and dedicated die

Info

Publication number: CN100338797C
Application number: CNB2004101004862A
Authority: CN
Inventors: 苗维新; 张全家
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-12-25
Filing date: 2004-12-25
Publication date: 2007-09-19
Anticipated expiration: 2024-12-25
Also published as: CN1797818A

Abstract

The present invention relates to a method for producing copper sheet gratings of lead acid batteries, which uses the method of casting to produce copper sheet gratings of lead acid batteries. The method has the concrete steps that a copper screen used as a basal body is provided with a plurality of locating lead rings, and the locating lead rings have the same thickness as that of a cladding lead layer of a copper sheet grating. The copper screen provided with the locating lead rings is arranged in a die which is heated to 328 to 600DEG. C, and then lead fused solution is cast into the die. After the lead fused solution and the die is cooled, the copper sheet grating blank is taken out. Air flue burs on the edge of the copper sheet grating blank is removed, redundant lead on the locating pinholes on the copper sheet grating blank is flatten, and the locating pinholes are closed to form copper sheet grating finished products. A special die in the producing method is composed of two mutually corresponding dies, wherein a combined surface at the inner side of each die is provided with a groove which has the same shape as that of the copper screen and larger size than that of the section of the copper screen. The present invention is characterized in that the groove is provided with a plurality of copper screen locating pins, and locating pins on the two dies correspond mutually to fix the copper screen in the central position of the cavity of the dies.

Description

Lead-acid battery copper plate grid production method and special molds

Technical field

The invention belongs to storage battery production field, particularly a kind of Lead-acid battery copper plate grid production method and special molds.

Background technology

Along with expanding economy and progress of science and technology, the use of storage battery more and more widely, consumption is also increasing.Particularly lead acid accumulator although be invention before more than 100 year, still in occupation of absolute advantage, is being brought into play irreplaceable important function in all departments of national economy in the market share of secondary cell.

As everyone knows, the theoretical specific energy of lead acid accumulator is 170Wh/kg, but in real process, most of batteries can only discharge the energy of 30～50Wh/kg, this species diversity causes by active material utilization is low on the one hand, then be that quality by inert component causes on the other hand, as battery case, pole plate grid, barrier film, terminal etc.Particularly as the pole plate grid that support active material, though it does not participate in into the stream reaction in battery, but when constituting electrode, can not lack, and, it still is the congeries of electric current, plays the CURRENT DISTRIBUTION effect, thereby, it all has significant effects to the main performance of storage battery as capacity, life-span, starting, charge acceptance etc.In order to improve specific energy of lead acid battery, for a long time, people attempt to seek a kind of new grid material and grid structure always when improving active material utilization, in the hope of with minimum quality and minimum price, obtain maximum conductivity and the highest intensity.The work of the exploration of this respect mainly concentrates on following three aspects: quick cooled alloy, load web plate grid and lead plating copper coin grid.Wherein, lead plating copper coin grid have been subjected to people's common concern, and it is to make matrix with copper mesh, and the surface coats one deck lead, to reduce grid resistance, improve power output, and the grid of this structure also is known as the copper coin grid.At present, on copper mesh, coat plumbous method and have three kinds: immersion plating, spraying plating and plating.The production technology of immersion plating is fairly simple, will put into plumbous liquation as the copper mesh of matrix exactly, takes out after the surface of copper mesh hangs up one deck lead.The problem that the immersion plating production technology exists is that the lead layer that matrix surface hangs up is thinner, and hangs the surface irregularity of plumbous back grid, no matter hang how many times lead, the thickness of lead layer can not increase, because, after hanging plumbous grid and putting into plumbous liquation, the lead that the grid surface hung up originally will be melted at once, so the surface of grid can only hang up very thin one deck lead, and, more and more out-of-flatness of surface behind the extension lead, practical effect is relatively poor.Spraying plating is exactly the surface that lead is sprayed on matrix, forms very thin one deck lead on the surface of grid.The grid lead layer uneven distribution that this method processes is even, particularly grid positive with the differing greatly of side lead layer thickness, in addition, the compactness of lead layer is also relatively poor, comes off easily in the process of using.Plating is exactly to adopt common electric plating method to plate one deck lead on the surface of matrix.A large number of experiments show that, lead plating copper coin grid are used for negative pole and help to improve the battery high-rate discharge ability, adopt the battery of lead plating copper coin grid to compare with the battery of Pb-Sb alloy grid, the former is greatly improved on the capacity of heavy-current discharge, once the traction battery capacity of being made up of lead plating copper coin grid negative pole the data report led at 1.25h, improved 25% than common batteries during discharge, energy has improved 31%, the capacity that shows lead plating copper coin grid storage battery heavy-current discharge is greatly improved, and demonstrates the good result of lead plating copper coin grid.In addition, the gas generating capacity reduced 10% approximately when lead plating copper coin grid were shelved, this be since plating be pure lead, and the Pb-Sb alloy contains Sb impurity, so gassing rate is big.In addition, because lead plating copper coin grid have increased mechanical strength, make the resistance to vibration of battery improve, also prolong useful life.But, adopt the manufacturing cost of electro-plating method lead plating on matrix very high, because the grid surface coats plumbous thickness and generally should be 100 μ m～300 μ m, the lead of electroplating 100 μ m～300 μ m on matrix then needs to spend long time, production cost is too high, thereby this method does not possess the value that heavy industrialization is implemented.So the storage battery of Sheng Chaning generally only uses at high power capacity, high-power output and long-life special dimension in this way.Though said method can coat one deck lead on the surface of matrix, and produce the copper coin grid that the surface is coated with lead layer, but there is not a kind of method to produce high-quality copper coin grid with cheap cost, and be suitable for large-scale industrial production, therefore, the development of copper coin grid has become an important subject in the battery production field.

The technical problem to be solved in the present invention is, overcome thin, the problems such as compactness is poor, production cost height of coating lead layer that above-mentioned method for producing copper sheet grating exists, a kind of Lead-acid battery copper plate grid production method and special molds that coats that lead layer thickness is unrestricted, compactness good, it is low to produce and be suitable for large-scale industrial production is provided.

The present invention adopts the method for casting to produce copper sheet grating of lead acid battery, and its concrete production method is:

1, on as the copper mesh of matrix several location lead rings are installed, the thickness of location lead ring is identical with the thickness that the copper coin grid coat lead layer;

2, the copper mesh that will install the location lead ring is placed in the mould, and mould is closed up fixing, utilizes the copper mesh pilot pin in the inboard groove of mould that copper mesh is located, and makes on its center that remains on dies cavity;

3, will the cast mold heated to 328 ℃ of copper coin grid～600 ℃;

4, plumbous liquation is cast in the mould, treat plumbous liquation and mold cools down after, take out the copper coin grid blank cast lead;

5, remove the air flue burr at copper coin grid blank edge, and on the copper coin grid blank because the formed unnecessary lead pressing of the annular recess at mold position pin and pilot pin place will be located the pin hole closure, promptly become copper coin grid finished product.

A kind of particular manufacturing craft of implementing above-mentioned method for producing copper sheet grating of lead acid battery, it is made of two corresponding mutually moulds, on the faying face of mould inboard, have identical with the shape of copper mesh, size is greater than the groove in copper mesh cross section, its special character is, several copper mesh pilot pins are installed in groove, and the pilot pin on two moulds is corresponding mutually, so that behind the matched moulds copper mesh is being fixed on the center of dies cavity, each pilot pin place at mould also has an annular recess, so that casting casts out a plumbous body when plumbous around pilot pin, fill up the pin hole that pilot pin stays.

The invention has the advantages that:

1, the method that adopts casting is at copper mesh direct casting lead, and production equipment is simple, and has simplified production technology, has improved production efficiency, simultaneously, has significantly reduced the production cost of copper coin grid, has realized the large-scale industrial production of copper coin grid.

2, the method that adopts casting is at copper mesh direct casting lead, and the thickness of lead layer is unrestricted, and the one-step casting moulding, and the compactness of lead layer is good, the qualification rate height of product.

3, installing and locating lead ring on as the copper mesh of matrix, and the copper mesh pilot pin is installed in the groove of mould, the copper mesh accurate localization on the center of dies cavity, has been guaranteed that the lip-deep lead layer thin and thick of copper coin grid is even, do not leak the copper phenomenon, thereby produce high-quality copper coin grid.

Description of drawings

Fig. 1 is the structural representation of particular manufacturing craft of the present invention;

Fig. 2 is the A-A cutaway view of Fig. 1;

Fig. 3 is the B portion enlarged drawing of Fig. 1;

Fig. 4 is the C portion enlarged drawing of Fig. 2;

Fig. 5 is the schematic diagram of installing and locating lead ring on the copper mesh of the present invention;

Fig. 6 is the D-D cutaway view Amplified image of Fig. 5.

Embodiment

1, on as the copper mesh 12 of matrix, several location lead rings 13 are installed, the quantity of location lead ring 13 is not limit, area according to copper mesh 12 is determined, if the area of copper mesh 12 is less, four location lead rings 13 then can be installed around copper mesh 12 to get final product, as shown in Figure 5 and Figure 6, if the area of copper mesh 12 is bigger, then need around copper mesh 12, reach the middle part a plurality of location lead ring 13 is installed, the thickness of location lead ring 13 is identical with the thickness that the copper coin grid coat lead layer, the effect of location lead ring 13 is, when copper mesh 12 is put into mould, copper mesh 12 is positioned, restriction copper mesh 12 moves on in-plane, and every line on the copper mesh 12 all is on the center of dies cavity groove, and makes between the groove of every line and mould on the copper mesh 12 and all have identical gap, existing ripe production technology is adopted in the making of copper mesh 12, specifically can adopt the line cutting, punching press or the mode of production such as draw in the net;

2, the copper mesh 12 that will install location lead ring 13 is placed in the mould, and mould is closed up fixing, utilizes copper mesh pilot pin in the inboard groove of mould to copper mesh 12 location, makes on its center that remains on dies cavity;

3, will the cast mold heated to 328 ℃ of copper coin grid～600 ℃, plumbous melting temperature is 328 ℃, when practical operation, the temperature of mould should be equal to or higher than plumbous melting temperature, guarantees the plumbous good flowability that has in mould;

5, remove the air flue burr at copper coin grid blank edge, and the formed unnecessary lead of the annular recess on the copper coin grid blank because mold position pin and pilot pin place flattened, to locate the pin hole closure, promptly become copper coin grid finished product, and also can adopt the mode of punching press or flatiron will locate the pin hole closure.

The particular manufacturing craft of implementing above-mentioned method for producing copper sheet grating of lead acid battery as shown in Figure 1, Figure 2, Figure 3 and Figure 4, it is made of two corresponding mutually sheet moulds 1, two alignment pins 3 and two location holes 9 are arranged, so that when matched moulds, locate respectively on two moulds 1; Have on the faying face of mould 1 inboard that shape with copper mesh 12 is identical, size is greater than the groove 6 of copper mesh 12 cross sections; The inside upper part of mould 1 has casting gate 2, and casting gate 2 is connected by passage 4 with the groove 6 of placing copper mesh 12, in the outside of the groove 6 of placing copper mesh 12 airway 7 is arranged, and groove 6 communicates with airway 7 by passage 8; Lug groove 10 is arranged at the bottom at the groove 6 of placing copper mesh 12, so that cast out lug when casting; Several copper mesh pilot pins 5 are installed in groove 6, and the pilot pin on two moulds 15 is corresponding mutually, so that behind the matched moulds copper mesh 12 is being fixed on the center of mould 1 inner chamber, the quantity of pilot pin 5 is not limit, mainly determine according to the area of copper mesh 12, if the area of copper mesh 12 is less, four pilot pins 5 are installed in mould 1 to get final product, if the area of copper mesh 12 is bigger, then several pilot pins 5 need be installed in mould 1 more, restriction copper mesh 12 moves at in-plane and vertical direction, to guarantee the location of copper mesh 12, because after mould 1 heating, location lead ring 13 on the copper mesh 12 has melted, at this moment, just need pilot pin 5 to support copper mesh 12, every line on the copper mesh 12 is remained on the center of mould 1 inner chamber groove 6, described pilot pin 5 should be installed in the infall of groove 6 as far as possible, because the infall space of groove 6 is bigger, both be convenient to install, be convenient to cast the back again the pin hole on the copper coin grid is handled; Each pilot pin 5 place at mould 1 also have an annular recess 11, so that casting casts out a plumbous body, the pin hole that pilot pin 5 stays when filling up casting when plumbous around pilot pin 5.

Claims

1, a kind of method for producing copper sheet grating of lead acid battery is characterized in that, it adopts the method for casting to produce copper sheet grating of lead acid battery, and its concrete production method is:

(1) on as the copper mesh of matrix several location lead rings are installed, the thickness of location lead ring is identical with the thickness that the copper coin grid coat lead layer;

(2) copper mesh that will install the location lead ring is placed in the mould, and mould is closed up fixing, utilizes the copper mesh pilot pin in the inboard groove of mould that copper mesh is located, and makes on its center that remains on dies cavity;

(3) will the cast mold heated to 328 ℃ of copper coin grid～600 ℃;

(4) plumbous liquation is cast in the mould, treat plumbous liquation and mold cools down after, take out the copper coin grid blank cast lead;

(5) remove the air flue burr at copper coin grid blank edge, and on the copper coin grid blank because the formed unnecessary lead pressing of the annular recess at mold position pin and pilot pin place will be located the pin hole closure, promptly become copper coin grid finished product.

2, a kind of particular manufacturing craft of implementing the described method for producing copper sheet grating of lead acid battery of claim 1, it is made of two corresponding mutually moulds, have on the faying face of mould inboard that shape with copper mesh is identical, size is greater than the groove in copper mesh cross section, it is characterized in that, several copper mesh pilot pins are installed in groove, and the pilot pin on two moulds is corresponding mutually, also has an annular recess at each pilot pin place of mould.