A kind of lead-acid battery interlocking lead mesh and preparation method thereof

Abstract

The present invention discloses a lead mesh for lead-acid batteries and a preparation method thereof, comprising an upper frame rib, a lower frame rib and a rib mesh woven therebetween, wherein a plurality of pole ears are arranged at intervals on the upper frame rib, and the rib mesh comprises a plurality of mesh ribs, wherein the mesh ribs are spiral reciprocating rotating bending structures, and are interlaced and woven in pairs to form the rib mesh. In the manufacturing process, the present invention has substantially no redundant waste to be removed, reduces the generation of process waste that must exist in conventional processes for forming lead meshes, and reduces the loss of raw material alloy or pure lead, energy and labor waste in the secondary repeated lead melting process.

Description

Technical Field

[0001] The invention relates to the technical field of lead-acid battery manufacturing, and in particular to an interlocking lead mesh for a lead-acid battery and a preparation method thereof. Background Art

[0002] Lead-acid batteries have a long history and are widely used in many industries, such as UPS, electric vehicles and automobiles. The internal plates of lead-acid batteries are composed of lead mesh and lead paste. Among them, the lead mesh grid is the carrier of lead paste and current in the plate, which plays a key role in battery performance and life. Therefore, the lead mesh grid should be as strong and corrosion-resistant as possible, and as low-cost as possible when designing. In the industry, there are many types according to the manufacturing process, such as: early gravity casting grid, later wire mesh grid, punching grid and continuous casting grid. However, these manufacturing processes have a large amount of waste generated, especially gravity casting and punching process waste generation up to 60%. These wastes need to be returned to the furnace for repeated use. During the repeated melting process, the alloy lead will be oxidized and burned, and about 5% of the oxidized lead slag will be wasted and cannot be used directly, so it causes a very large waste of raw materials, energy and labor, and increases environmental pollution. Summary of the invention

[0003] The purpose of the present invention is to provide a lead-acid battery interlocking lead mesh and a preparation method thereof, wherein substantially no redundant waste needs to be removed during the manufacturing process, thereby reducing the generation of process waste that must exist for lead mesh molding in conventional processes, and reducing the loss of raw material alloy or pure lead, energy and labor waste during secondary repeated lead melting.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a lead-acid battery interlocking lead mesh, including upper frame ribs, lower frame ribs and a rib mesh woven between the two, a plurality of pole ears are arranged on the upper frame ribs at intervals, the rib mesh includes a plurality of mesh ribs, the mesh ribs are spiral reciprocating rotating bending structures, and are interlaced and woven in pairs to form the rib mesh.

[0005] A further improvement of the present invention is that the plurality of grid ribs are divided into a thick rib group, a middle rib group and a thin rib group from top to bottom, wherein the rib diameter of the middle rib group is smaller than the rib diameter of the thick rib group and larger than the rib diameter of the thin rib group.

[0006] A further improvement of the present invention is that the rib diameter of the middle rib group is half of the sum of the rib diameters of the thick rib group and the thin rib group.

[0007] A further improvement of the present invention is that the grid of the rib net is rhombus-shaped, and the interlocking points where the inner grid ribs form the grid are pressed and rolled into a flat shape.

[0008] A further improvement of the present invention is that the area of ​​a single grid is less than 95 mm2.

[0009] A further improvement of the present invention is that the surface of the mesh ribs is a rough structure with a roughness range as follows: Ra is 6.5-10µm, R3Z is 10-20µm, and Rpc is 30-45 / cm.

[0010] A further improvement of the present invention is that the upper frame ribs, the lower frame ribs and the rib net are all made of lead alloy, and the lead alloy is made by melting materials with the following weight percentage components: 0.1% calcium, 1.5% tin, 0.008% silver, and the rest is lead.

[0011] A method for preparing an interlocking lead mesh for a lead-acid battery comprises the following steps:

[0012] S1: using a die-casting machine and a corresponding die-casting mold to manufacture upper frame ribs, lower frame ribs and mesh ribs of the semi-finished material in advance, and rolling them up on a rib plate;

[0013] S2: fixing a plurality of rib discs on an unwinding roller of a braiding machine, and introducing one end of each rib disc into the braiding machine;

[0014] S3: Using a weaving machine, the upper frame ribs and the lower frame ribs are used as the upper and lower edges to weave a plurality of mesh ribs into a mesh structure to form a lead mesh belt;

[0015] S4: The lead mesh belt is pressed by a pressing roller to press the mesh interlocking points thereon into a flat shape;

[0016] S5: The lead mesh bag is rolled up onto the winding reel by a winding machine.

[0017] The beneficial effects of the present invention are:

[0018] The present invention makes two-way innovations in the battery grid structure and manufacturing process, transforms conventional casting, mesh punching and mesh drawing into a rib interlacing structure, and introduces mature equipment in other fields to realize the new process of lead mesh interlacing weaving in the battery field. There is basically no excess waste to be cut off during the manufacturing process, so the generation of process waste that must exist for lead mesh molding in conventional processes is avoided or reduced to a great extent; the loss of raw material alloy or pure lead, energy and labor waste in the secondary repeated lead melting process are reduced.

[0019] In the present invention, the mesh ribs are of a spiral reciprocating rotating bending structure, and are interlaced and woven in pairs to form a rib net. The mesh connection of the rib net is a rotating interlocking structure, which is firmly and reliably connected and has strong tensile resistance.

[0020] In the present invention, the lead mesh can be continuously woven using only several ribs with different structures, and can be woven using a braiding machine in the prior art, with low manufacturing cost, high efficiency, and a simple and flexible structure.

[0021] In the present invention, the grid ribs are spirally reciprocating rotating bending structures, and are woven in pairs to form a rib net, which presents a three-dimensional structure through the spiral bending structure. Compared with the conventional flat lead mesh, it can better carry lead paste, which is beneficial to the charging and discharging performance of the battery.

[0022] In the present invention, the surface of the rib is a rough structure, which increases the specific surface area of ​​the rib and the frame, improves the bonding strength between the lead paste and the lead mesh, and also reduces the interface resistance and increases the conductivity.

[0023] In the present invention, the upper frame ribs, the lower frame ribs and the rib net are all made of lead alloy. The role of calcium in the lead alloy is to make the lead net have good strength. If it is too low, the strength will be poor, and if it is too high, the corrosion resistance will be poor. The role of tin is to improve the fluidity of the alloy, make the ribs easy to form, and improve the corrosion resistance of the ribs to sulfuric acid. The role of silver is to improve the conductivity of the ribs and the cross-section of the lead paste, so that the lead paste can be fully charged and discharged. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the interlocking lead mesh structure of the lead-acid battery of the present invention.

[0025] Figure 2 The present invention is a schematic diagram of the preparation process of the lead-acid battery interlocking lead mesh.

[0026] In the figure, 1-upper frame rib, 2-lower frame rib, 3-rib net, 4-ear, 5-grid rib, 6-rib disc, 7-unwinding roller, 8-braiding machine, 9-pressing roller, 10-winding machine, 11-winding disc. DETAILED DESCRIPTION

[0027] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0028] Example 1: Combination Figure 1~2 It can be seen that a lead-acid battery interlocking lead mesh includes an upper frame rib 1, a lower frame rib 2 and a rib mesh 3 woven therebetween, a plurality of pole ears 4 are arranged at intervals on the upper frame rib 1, the rib mesh 3 includes a plurality of mesh ribs 5, the mesh ribs 5 are a spiral reciprocating rotating bending structure, and are interlaced and woven in pairs to form the rib mesh 3.

[0029] The cross section of the upper frame rib 1 can be square or circular, etc., and needs to be manufactured in advance using continuous casting equipment and molds. The lower frame rib 2 is a straight structure with a circular cross section, which needs to be manufactured in advance using continuous casting equipment and molds. The grid rib 5 is used to support the lead paste of the battery plate and conduct the current to the upper frame rib 1 and the tab 4, and finally the tab 4 conducts the current to the outside.

[0030] The multiple mesh ribs 5 are divided into a thick rib group, a middle rib group and a thin rib group from top to bottom, and the rib diameter of the middle rib group is smaller than the rib diameter of the thick rib group and larger than the rib diameter of the thin rib group. Preferably, the rib diameter of the middle rib group is half of the sum of the rib diameters of the thick rib group and the thin rib group. Under the same lead mesh weight, the sulfuric acid corrosion resistance life of the lead mesh can be increased because when the lead paste is charged and discharged, the closer the mesh rib 5 is to the upper frame rib 1, the greater the cumulative current carried, so the design of thick top and thin bottom is useful to improve the uniformity of current density.

[0031] The mesh of the rib net 3 is diamond-shaped, and the mesh ribs 5 therein are pressed and flattened at the interlocking points of the mesh. Pressing and rolling can make the mesh ribs 5 more tightly bonded and improve the stability at the interlocking points. Instead of completely flattening the two mesh ribs to the same plane, the mesh ribs 5 still maintain a spiral reciprocating rotating bending structure to facilitate the bearing of lead paste.

[0032] Preferably, the area size of a single grid is less than 95mm 2 The mesh structure is formed by interlacing and weaving, and the mesh ribs 5 are pulled against each other, which is more stable than the conventional cube or rectangular shape and is not prone to diagonal deformation. The structure of the rib mesh 3 is not limited to Figure 1 The structure shown in can also be changed according to design requirements.

[0033] The surface of the mesh rib 5 is a rough structure with a roughness range of Ra (peak height) of 6.5-10µm and R 3 Z (representative distance from peak to valley) is 10-20µm, and Rpc (number of peaks per centimeter) is 30-45 / cm. This range can be closely connected with the lead paste particles. Too small or too large will cause other problems, such as the top of the rough particles breaking and falling off, and the specific surface area is too small.

[0034] The upper frame rib 1, the lower frame rib 2 and the rib net 3 are all made of lead alloy, which is made by melting the following materials in weight percentage: 0.1% calcium, 1.5% tin, 0.008% silver, and the rest is lead. Among them, the role of calcium is to make the lead net have good strength, too low strength is poor, too high corrosion resistance is poor; the role of tin is to improve the fluidity of the alloy, the rib is easy to form, and improve the corrosion resistance of the rib to sulfuric acid; the role of silver is to improve the conductivity of the rib and the lead paste section, so that the lead paste can be fully charged and discharged.

[0035] A method for preparing an interlocking lead mesh for a lead-acid battery comprises the following steps:

[0036] S1: using a die-casting machine and a corresponding die-casting mold to manufacture upper frame ribs, lower frame ribs and mesh ribs of the semi-finished material in advance, and rolling them up on the rib plate 6;

[0037] S2: Fixing a plurality of rib discs 6 on the unwinding roller 7 of the braiding machine, and introducing one end of each rib disc 6 into the braiding machine 8;

[0038] S3: Using a weaving machine 8, the upper frame ribs 1 and the lower frame ribs 2 are used as the upper and lower edges to weave a plurality of mesh ribs 5 into a mesh structure to form a lead mesh belt;

[0039] S4: The lead mesh belt is pressed by a pressing roller 9 to press the mesh interlocking points thereon into a flat shape;

[0040] S5: The lead mesh bag is rolled up onto the roll-up reel 11 by the roll-up machine 10. The roll-up method can be vertical or horizontal roll-up as required for use in subsequent processes.

[0041] The prepared lead mesh is then pulled to the post-plate coating process for continuous coating and cutting into small plates (at this time, it is a whole of small lead mesh and lead paste), and finally assembled into a battery together with other battery accessories for use.

[0042] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly used in other related technical fields, are similarly included in the patent protection scope of the present invention.

Claims

1. A lead-acid battery interlocking lead mesh, characterized in that: The invention comprises an upper frame rib (1), a lower frame rib (2) and a rib net (3) woven therebetween, wherein a plurality of pole ears (4) are arranged at intervals on the upper frame rib (1), and the rib net (3) comprises a plurality of mesh ribs (5), wherein the mesh ribs (5) are spiral reciprocating rotating bending structures, and are interlaced and woven in pairs to form the rib net (3), and the plurality of mesh ribs (5) are divided into a thick rib group, a middle rib group and a thin rib group from top to bottom, and the rib diameter of the middle rib group is smaller than the rib diameter of the thick rib group and larger than the rib diameter of the thin rib group.

2. The interlocking lead mesh for lead-acid batteries according to claim 1, characterized in that: The rib diameter of the middle rib group is half of the sum of the rib diameters of the thick rib group and the thin rib group.

3. The interlocking lead mesh for lead-acid batteries according to claim 1, characterized in that: The mesh of the rib net (3) is rhombus-shaped, and the interlocking points where the inner mesh ribs (5) form the mesh are pressed and rolled into a flat shape.

4. The interlocking lead mesh of a lead-acid battery according to claim 3, characterized in that: The area size of a single grid is less than 95mm 2 .

5. The interlocking lead mesh for lead-acid batteries according to claim 1, characterized in that: The surface of the mesh ribs (5) is a rough structure with a roughness range of: Ra is 6.5-10µm, R3Z is 10-20µm, and Rpc is 30-45 / cm.

6. The interlocking lead mesh for lead-acid batteries according to claim 1, characterized in that: The upper frame ribs (1), the lower frame ribs (2) and the rib net (3) are all made of a lead alloy, which is made by melting materials with the following components in weight percentage: 0.1% calcium, 1.5% tin, 0.008% silver, and the remainder lead.

7. A method for preparing an interlocking lead mesh for a lead-acid battery according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: using a die-casting machine and a corresponding die-casting mold to pre-produce upper frame ribs, lower frame ribs and mesh ribs of the semi-finished material, and rolling them up on a rib plate (6); S2: fixing a plurality of rib discs (6) on an unwinding roller (7) of a braiding machine, and introducing one end of each rib disc (6) into the braiding machine (8); S3: using a weaving machine (8) to weave a plurality of mesh ribs (5) into a mesh structure to form a lead mesh belt, using an upper frame rib (1) and a lower frame rib (2) as the upper and lower edges; S4: The lead mesh belt is pressed by a pressing roller (9) to press the mesh interlocking points thereon into a flat shape; S5: The lead mesh bag is rolled up onto a winding reel (11) by a winding machine (10).

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