Continuous punching grid alloy for lead-acid storage battery

Abstract

The invention provides a lead-acid storage battery continuous punching grid alloy, and relates to the field of grid processing. The continuous punching grid alloy of the lead-acid storage battery comprises a grid base material formed by a lead-based alloy material added with an additive of which the total mass is one percent of that of which the malleability is improved, blanking, punching, cutting off and extending redundant materials of the grid base material, fixing one end of the blanked grid base material, extending the grid base material towards one side far away from the fixed end, and forming the continuous punching grid alloy of the lead-acid storage battery. And the interval of the grating part is increased. According to the continuous punching grid alloy for the lead-acid storage battery, the grid base material is firstly processed into a rough shape, and then the grid part is extruded in an extrusion extension mode, so that under the condition that the grid base material is thinned by extrusion, a frame with a relatively wide thickness is still kept on the edge of the whole shape, and the whole strength can be kept; compared with a processing mode of a net pulling type plate grid base material, the strength of the device can be ensured while the pore area is increased.

Description

Technical Field

[0001] This invention relates to the field of grid processing, specifically to a lead-acid battery continuous stamping grid alloy. Background Technology

[0002] Grids are manufactured by melting lead ingots into molten lead, pouring the molten lead into a grid mold with grid cavities, and then cooling and solidifying it; this process is known as "gravity casting." Grids manufactured using this method are prone to uneven grid rib thickness, and may even have defects such as porosity and slag inclusions, which seriously affect the performance of the battery during use.

[0003] CN1126378A provides a mesh-type electrode plate, which is manufactured through nine stations, including stamping and expanding the mesh grid strip, applying lead paste, edge pressing, slicing, and punching. This product features a uniform and robust mesh, suitable for various lead-acid batteries. Its manufacturing process is simple and continuous, providing excellent conditions for high-quality and high-volume production. While the mesh-type processing increases the pore area, the lack of side frame support makes the grid prone to deformation. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a lead-acid battery grid alloy that solves the problem mentioned in the background section that grids are prone to deformation while increasing pore area.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a lead-acid battery grid alloy, comprising a grid substrate made of lead-based alloy material with added additives to enhance ductility by a total mass of one percent, the grid substrate comprising the following processing steps: Step 1, punching, to punch away the excess material of the grid substrate; Step 2, extension: Fix one end of the punched grid substrate and extend the grid substrate away from the fixed end to increase the spacing of the grid section.

[0006] Preferably, in the extension step, the fixed end is the electrode tab end, and the pressing direction is perpendicular to the connection direction between the electrode tab and the grid.

[0007] Preferably, the grid substrate is manufactured by casting, wherein the thickness of the grid skeleton parallel to the tabs and parallel to the extension direction and the frame thickness in the grid connection direction are greater than the overall thickness.

[0008] Preferably, the grid substrate is composed of a treated lead plate, and its stretching step includes: Step 1: Extrude the grid section so that its thickness is less than that of the frame and the tab section. Step two involves a second punching process on the extended grid frame section to reduce its width.

[0009] Preferably, the grid substrate is made of processed lead plate, and its pretreatment steps include local heating and extrusion of both sides of the lead plate, and in the cutting step, the connection direction between the tab and the grid is perpendicular to the heated edge of the lead plate.

[0010] Preferably, the local heating and extrusion includes a conveying mechanism for conveying lead plates, with heating ends for heating the edges of the lead plates on both sides of the upper part of the conveying mechanism, a positioning pressure plate for restricting the deformation direction of the lead plates by moving up and down in the middle of the upper part of the conveying mechanism, and extrusion mechanisms for moving perpendicular to the moving direction of the lead plates on both sides of the conveying mechanism.

[0011] Preferably, the extension process includes a support portion for supporting the grid substrate, a clamping portion that moves up and down to hold the grid substrate above the support portion, and a clamping portion that clamps the grid substrate by moving up and down above the support portion. The clamping portion is controlled by a traction mechanism to achieve vertical and clamping direction movement.

[0012] Preferably, the stretching process includes a plurality of stamping mechanisms arranged in succession. Each stamping mechanism is equipped with a replaceable stamping head and a stamping plate adapted to the stamping head. The stamping head includes a protruding stamping head covering the grid portion and a cutting stamping head for cutting the grid skeleton portion.

[0013] Preferably, the processing temperature for punching and stretching is between 20 and 80 degrees Celsius.

[0014] Preferably, the additive comprises 0.02%–0.05% silver, 0.03%–0.04% copper, and the remainder tin.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The lead-acid battery continuous stamping grid alloy is made by first processing the grid substrate into a rough shape, and then extruding and stretching the grid part. In this way, even when the grid becomes thinner, the overall shape is still maintained with a relatively thick border at the edge, thus maintaining the overall strength. Compared with the processing method of mesh grid substrate, this method can increase the pore area while ensuring the strength of the device.

[0016] 2. The lead-acid battery grid alloy, by extending along the pressing direction perpendicular to the connection direction between the tab and the grid, allows the grid substrate to preferentially undergo plastic deformation in the tab direction. As the grid has been sufficiently stretched in this direction, it can break in time during the grid growth process, avoiding the situation where the grid is partially broken, which would cause performance fluctuations in the battery.

[0017] 3. In the casting process of this lead-acid battery continuous stamping grid alloy, some positions are set as protrusions in advance. During the extension process, both the protruding and non-protruding parts are rolled and deformed. However, the protruding parts still maintain the effect of protruding out of the whole after rolling. Thus, while increasing the pore area by extrusion and extension, the protruding reinforcing ribs can support the entire device.

[0018] 4. The lead-acid battery continuous stamping grid alloy keeps the frame part from being thinned by stamping, and only the grid part is thinned by stamping. In this way, the whole provides strength in the edge part that is not thinned by stamping, and the width of the grid skeleton part is reduced by secondary stamping, which increases the area of ​​the gap.

[0019] 5. The lead-acid battery continuous stamping grid alloy, by heating the two sides of the plate edge, can make the edge of the plate plastically deformed by extrusion, increasing the thickness at the edge, reserving space for subsequent extrusion deformation, so that the thickened part is used to form the frame of the grid substrate. After the frame and grid part are extended to increase the gap area, a frame with a thickness higher than the whole can be formed to maintain the strength of the device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 3 of the present invention; Figure 2 This is a partial schematic diagram of Embodiment 3 of the present invention; Figure 3 This is a schematic diagram of the plate grid substrate structure of the present invention; Figure 4 This is a schematic diagram of Embodiment 1 of the present invention; Figure 5 This is a partial schematic diagram of an example of the present invention; Figure 6 This is a schematic diagram of Embodiment 2 of the present invention; Figure 7 This is a schematic diagram of the connection of the protruding stamping head of the present invention; Figure 8 This is a schematic diagram of the connection of the cutting and stamping diagram of the present invention.

[0021] In the figure: 101, conveying mechanism; 102, heating end; 103, positioning pressure plate; 104, extrusion mechanism; 201, bearing part; 202, clamping part; 203, locking part; 204, traction mechanism; 301, stamping mechanism; 32, stamping head; 303, stamping support plate; 321, protruding stamping head; 322, cutting stamping head. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0023] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0024] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0026] Example 1, such as Figures 3-5 As shown, a lead-acid battery grid alloy comprises a grid substrate made of lead-based alloy material with additives added in a total mass fraction of one percent to improve ductility. The grid substrate includes the following processing steps: Step 1, punching, to punch away the excess material of the grid substrate; Step two, extension: Fix one end of the punched grid substrate and extend the grid substrate away from the fixed end to increase the spacing of the grid section. In this technical solution, the grid substrate is first processed into a rough shape, and then the grid section is extruded and extended. In this way, even when it is thinned by extrusion, the edges of the overall shape still have a relatively thick border, thereby maintaining the overall strength. Compared with the processing method of the mesh-type grid substrate, it can increase the pore area while ensuring the strength of the device.

[0027] In the extension step, the fixed end is the tab end, and the pressing direction is perpendicular to the connection direction between the tab and the grid. This setting allows the grid substrate to undergo plastic deformation preferentially in the tab direction. Since the grid has been fully stretched in this direction, it can break in time during the grid growth process, avoiding the situation where the grid is partially broken, which would cause performance fluctuations in the battery and affect the judgment of the battery's health.

[0028] The irreversible dimensional and structural deformation of the positive grid of a lead-acid battery during cycling and use is mainly caused by the superposition of corrosion / oxidation, volume expansion and contraction stress of active material, alloy creep and casting defects, which can lead to grid fracture, active material shedding, internal short circuit and lifespan reduction.

[0029] Further optimization involves setting the punching and stretching processing temperatures to between 20 and 80 degrees Celsius. By limiting the temperature to room temperature and slightly increasing it, but keeping it below the melting point of the alloy material, the device can be guaranteed to exhibit excellent ductility at suitable temperatures, thus avoiding material fracture caused by temperature effects.

[0030] Further optimization involves additives comprising 0.02%–0.05% silver, 0.03%–0.04% copper, and the remainder tin. By increasing the content of silver and copper in the alloy, the ductility of the alloy can be improved, thereby preventing material fracture during the stretching process.

[0031] Further optimization involves manufacturing the grid substrate by casting. The thickness of the grid skeleton parallel to the tabs and parallel to the extension direction, as well as the thickness of the frame in the grid connection direction, are greater than the overall thickness. This design allows some positions to be pre-set as protrusions during the casting process. During the extension process, both the protruding and non-protruding parts are rolled and deformed. However, the protruding parts still maintain their protruding effect after rolling. This allows the device to maintain the protruding reinforcing ribs to support the entire device while increasing the pore area through extrusion and extension.

[0032] The stretching process includes a support portion 201 for supporting the grid substrate. The support portion 201 includes limiting protrusions on both sides that restrict the deformation direction of the grid substrate. The grid substrate can slide above the support portion 201. Above the support portion 201 is a clamping portion 202 that moves up and down to clamp the grid substrate. The clamping portion 202 is used to fix the grid substrate and limit the clamped part to reduce plastic deformation. Above the support portion 201 is a clamping portion 203 that clamps the grid substrate by moving up and down. In this embodiment, the clamping portion 203 is composed of a roller assembly, especially a roller assembly with a lower cut surface higher than the base roller assembly at the edge. The rollers used for pressurizing the grid part are used to deform the rollers. The rollers higher than the base rollers are used to extrude the protruding parts. In this way, different heights of forming effect are formed under the same descent distance and extrusion action. The clamping part 203 is controlled by the traction mechanism 204 to achieve vertical and clamping direction movement. The traction mechanism 204 is driven by a servo motor to drive the lead shaft, or it can be driven by a telescopic sleeve. When the clamping part 203 and the clamping part 202 are descending together, the traction mechanism 204 drives the clamping part 203 to move, which can extrude plastic deformation of the grid substrate. When the clamping part 202 is rising, it drives the clamping part 203 to move, which can cause the grid substrate to be displaced.

[0033] Example 2, as follows Figures 6-8 As shown, the grid substrate is composed of treated lead plates, and its stretching steps include: Step 1: Extrude the grid section so that its thickness is less than that of the frame and the tab section. Step two involves a second punching of the extended grid skeleton to reduce its width. In this embodiment, uncoiled sheet metal is used for processing. The tabs and grid are punched out during the first punching process, which defines the approximate size of the entire grid plate. Then, the grid is compressed to thin the skeleton material that makes up the grid. During the thinning process, the width of the skeleton is extended. Therefore, a second punching is required to remove the excess part of the grid skeleton and increase the area of ​​the pores.

[0034] The extension process includes multiple stamping mechanisms 301 arranged in succession. Each stamping mechanism 301 is equipped with a replaceable stamping head 32 and a stamping support plate 303 adapted to the stamping head 32. The stamping head 32 and the stamping support plate 303 are replaced as a whole. The stamping head 32 includes a protruding stamping head 321 covering the grid portion. The edge of the protruding stamping head 321 is inclined to reserve space for deformation of the skeleton portion. It also includes a cutting stamping head 322 for cutting the grid skeleton portion. The cutting stamping head 322 is used to cut off the excess portion. At the same time, the cutting portion of the cutting stamping head 322 is defined as an arc-shaped chamfer to avoid stress concentration. In this embodiment, the frame portion is kept from being thinned by stamping, and only the grid portion is thinned by stamping. In this way, the whole provides strength in the edge portion that is not thinned by stamping, and the width of the grid skeleton portion is reduced by secondary stamping, which increases the area of ​​the gap.

[0035] Example 3, as follows Figure 1 and Figure 2 As shown, the grid substrate is composed of processed lead plates. Its pretreatment steps include localized heating and extrusion of both sides of the lead plate. In the cutting step, the connection direction between the tabs and the grid is perpendicular to the heated edge of the lead plate. This embodiment is an improvement on Embodiment 1. Grid substrates produced by casting have the problem of large volume and internal air bubbles. Therefore, a plate-based processing method is proposed. By heating the two edges, the edges of the plate can be extruded and plastically deformed, increasing the thickness at the edges and reserving space for subsequent extrusion deformation. To further increase the edge thickness, the edges can be bent and then forged again. However, during the bending process, internal air cannot be expelled. Although this achieves the effect of increasing edge thickness without heating, it also easily leads to air bubbles. The thickened portion is used to form the two sides of the frame. After heating, punching and stretching processes are performed to form a grid substrate with a frame thickness greater than the grid thickness, thereby ensuring the strength of the grid substrate.

[0036] The local heating and extrusion process includes a conveying mechanism 101 for conveying lead plates. The conveying mechanism 101 uses a circulating conveyor belt, and the uncoiled lead plates move synchronously with the conveying mechanism 101. Heating ends 102 for heating the edges of the lead plates are provided on both sides of the upper part of the conveying mechanism 101. The edges of the plates are heated by combustion. By controlling the heating distance and the moving speed of the conveying mechanism 101, the edges are brought to a state where they are easy to undergo plastic deformation. A positioning pressure plate 103 is provided in the upper middle part of the conveying mechanism 101 to restrict the deformation direction of the lead plates by moving up and down. When the positioning pressure plate 103 is working, the conveying and uncoiling are stopped. The two ends of the positioning pressure plate 103 are protruding. Extrusion mechanisms 104 that move perpendicular to the moving direction of the lead plates are provided on both sides of the conveying mechanism 101. Under the combined action of the extrusion mechanism 104 and the positioning pressure plate 103, the edges are protruded.

[0037] In use, by adjusting the alloy material, the ductility of the grid substrate is increased, and the tabs are formed by stamping. Excess material in the gaps is removed to form a substrate for deformation. The frame and / or grid parts are plasticized by stretching to increase the area of ​​the gaps, thereby maintaining the strength of the edge frame support.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0039] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lead-acid battery grid alloy, comprising a grid substrate made of lead-based alloy material with additives added in a total mass fraction of one percent to improve ductility, characterized in that: The plate grid substrate includes the following processing steps: Step 1, punching, to punch away the excess material of the grid substrate; Step 2, extension: Fix one end of the punched grid substrate and extend the grid substrate away from the fixed end to increase the spacing of the grid section.

2. The lead-acid battery grid alloy according to claim 1, characterized in that: In the extension step, the fixed end is the electrode tab end, and the pressing direction is perpendicular to the connection direction between the electrode tab and the grid.

3. The lead-acid battery grid alloy according to claim 2, characterized in that: The grid substrate is manufactured by casting, wherein the thickness of the frame parallel to the connection direction between the tab and the grid and the grid skeleton parallel to the extension direction in the grid substrate is greater than the overall thickness.

4. The lead-acid battery grid alloy according to claim 2, characterized in that: The grid substrate is composed of treated lead plates, and its stretching steps include: Step 1: Extrude the grid section so that its thickness is less than that of the frame and the tab section. Step two involves a second punching process on the extended grid frame section to reduce its width.

5. The lead-acid battery grid alloy according to claim 2, characterized in that: The grid substrate is made of processed lead plate. Its pretreatment steps include local heating and extrusion of both sides of the lead plate, and in the cutting step, the connection direction between the tab and the grid is perpendicular to the heated edge of the lead plate.

6. The lead-acid battery grid alloy according to claim 5, characterized in that: The local heating and extrusion includes a conveying mechanism (101) for conveying lead plates. Heating ends (102) for heating the two sides of the lead plate are provided on the upper sides of the conveying mechanism (101). A positioning pressure plate (103) for restricting the deformation direction of the lead plate is provided in the upper middle part of the conveying mechanism (101). Extrusion mechanisms (104) for moving perpendicular to the moving direction of the lead plate are provided on both sides of the conveying mechanism (101).

7. A lead-acid battery grid alloy according to any one of claims 3, 5, and 6, characterized in that: The extension process includes a support part (201) for supporting the grid substrate, a clamping part (202) for clamping the grid substrate by moving up and down above the support part (201), and a clamping part (203) for clamping the grid substrate by moving up and down above the support part (201). The clamping part (203) is controlled by a traction mechanism (204) to achieve vertical and clamping direction movement.

8. The lead-acid battery grid alloy according to claim 4, characterized in that: The extension process includes a plurality of stamping mechanisms (301) arranged in succession. Each stamping mechanism (301) is provided with a replaceable stamping head (32) and a stamping plate (303) adapted to the stamping head (32). The stamping head (32) includes a protruding stamping head (321) covering the grid portion and a cutting stamping head (322) for cutting the grid skeleton portion.

9. A lead-acid battery grid alloy according to any one of claims 2-5 and 8, characterized in that: The processing temperature for punching and stretching is between 20 and 80 degrees Celsius.

10. The lead-acid battery grid alloy according to claim 9, characterized in that: The additives comprise 0.02%–0.05% silver, 0.03%–0.04% copper, and the remainder tin by weight.

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