A lead-acid battery grid

Abstract

This utility model discloses a lead-acid battery grid, comprising several grid units. Each grid unit includes three grids arranged in a single row, namely a first grid, a second grid, and a third grid. The tabs of the first and second grids are arranged opposite each other, forming a first lateral positioning frame at their junction. The tab of the third grid is attached to the side of the second grid away from the tab, forming a second lateral positioning frame at its junction. The first and second lateral positioning frames provide two independent positioning reference points during coating plate cutting, effectively reducing the probability of cutting deviation compared to the single-point positioning of traditional single-row two-grid configurations. The continuous arrangement of the three grids increases the number of grids formed in a single stamping, improving coating speed by 33%. Simultaneously, the connecting piece only generates one scrap at the second lateral positioning frame, significantly improving lead material utilization compared to the three scraps generated by tab-opposite structures.

Description

Technical Field

[0001] This utility model relates to the field of lead-acid battery manufacturing technology, and in particular to a lead-acid battery grid. Background Technology

[0002] Lead-acid batteries, as crucial energy storage devices, rely heavily on their grids, which serve as the carriers of active materials and the framework for current conduction, significantly influencing battery performance. With increasing demands for production efficiency and material utilization in the power battery sector, continuous casting and rolling grid-forming technology, due to its highly efficient and continuous production characteristics, has become the mainstream technology for manufacturing power lead-acid battery grids. The mesh-like grids produced through this process, when used in conjunction with automated continuous coating lines, significantly improve the processing efficiency of the casting and coating stages.

[0003] However, the existing plate grid structure under the continuous casting and rolling process still has the following technical bottlenecks:

[0004] Single-row, two-tab opposing grid structure: In this structure, the tabs of the two grids are connected by their opposing upper frames, with only a single frame support at the connection point. This design means that the coating process relies on only a single connection point for positioning. During high-speed continuous coating, mechanical vibration or tension fluctuations can easily cause positioning misalignment, leading to defects in the electrode paste layer. Misalignment not only affects the consistency of the electrodes but also results in uneven distribution of internal resistance in the battery, shortening cycle life.

[0005] Back-to-back plate grid structure: This structure connects the lower edges of two plate grids with connecting tabs, and uses a hanging strip design on the outer edge to achieve three-point positioning. While this improves the positioning stability of the coating plate to some extent, the redundant structure formed by the connecting tabs and hanging strips results in a large amount of scrap material during the screen punching process. Statistics show that the lead material utilization rate of this structure is less than 85%, significantly increasing raw material costs. Furthermore, the scrap material easily falls off and adheres to the electrode surface during the coating line transport, creating a potential local short circuit hazard, increasing the scrap rate by approximately 3%-5% and adding complexity to subsequent cleaning processes.

[0006] In the prior art, for example, the "continuous casting plate grid mesh structure" disclosed in Chinese patent literature, publication number "CN212085136U", is composed of two rows of multiple series plate grids horizontally connected. The pole ears of the two rows of series plate grids are arranged opposite to each other on the outside of the structure. The bottom edges of the two rows of series plate grids are staggered relative to each other and are horizontally connected to the inside of the structure by staggered connecting blocks that feed sequentially along the plate grid coating feeding direction.

[0007] While the aforementioned solutions attempted to improve the problems by optimizing the punching die or adjusting the distribution of the grid ribs, they consistently failed to balance positioning accuracy and material economy. Therefore, there is an urgent need to design a new type of grid structure. Utility Model Content

[0008] To address the problem of low positioning accuracy in traditional single-row two-piece grid cutting, this utility model provides a lead-acid battery grid that ensures at least two-point positioning to improve coating accuracy while minimizing scrap generation, thereby increasing lead material utilization and reducing quality risks.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A lead-acid battery grid includes several grid units, each grid unit comprising three grids arranged in a single row in a continuous transverse direction, namely a first grid, a second grid, and a third grid; wherein the tabs of the first grid and the second grid are arranged opposite to each other and form a first transverse positioning frame at the junction; the tab of the third grid is engaged with the side of the second grid away from the tab and forms a second transverse positioning frame at the junction.

[0011] The first and second transverse positioning frames provide two independent positioning reference points during coating plate cutting, which effectively reduces the probability of cutting deviation compared to the single-point positioning of traditional single-row two-plate grids. The continuous arrangement of the three grids increases the number of grids formed in a single stamping, improving the coating speed by 33%. At the same time, the connecting piece only generates one scrap at the second transverse positioning frame, significantly improving lead material utilization compared to the three scraps generated by the back-to-back tab structure. The positioning frame is formed by the direct enclosure of the grid frame edge and the tab, eliminating the need for additional hanging strips and simplifying the stamping die structure.

[0012] Furthermore, the grid includes an upper frame and a lower frame, which are connected by side frames to form a rectangular frame. An electrode tab extends from the rectangular frame. Several intersecting horizontal and vertical ribs forming the grid are arranged within the rectangular frame. The design of the electrode tab extending from the rectangular frame allows it to be integrally formed with the frame, reducing welding or riveting processes and lowering interface resistance. The intersection angle of the horizontal and vertical ribs in the grid directly affects the uniformity of active material adhesion; orthogonal arrangement can form uniform mesh pores, improving electrolyte wetting efficiency. The thickness consistency of the frame and ribs using continuous casting and rolling processes is easier to control, avoiding the risk of fracture caused by localized stress concentration.

[0013] Furthermore, the upper edge of the first grid is connected to the tab of the second grid, and the upper edge of the second grid is connected to the tab of the first grid. The connection points form a first cutting point and a second cutting point. The first cutting point is located at the junction of the upper edge of the first grid and the tab of the second grid, and the second cutting point is located at the junction of the upper edge of the second grid and the tab of the first grid. The upper edge of the first grid, the upper edge of the second grid, and their tabs together form a first horizontal positioning frame. The lower edge of the second grid is connected to the tab of the third grid and forms a fourth cutting point. A connecting piece is also provided between the upper edge of the third grid and the lower edge of the second grid. The two ends of the connecting piece form a third cutting point and a fifth cutting point. The lower edge of the second grid, the tab of the third grid, and the connecting piece together form a second horizontal positioning frame. The upper edges of the first and second grids are connected to the opposite tabs, forming symmetrical first and second cutting points. After cutting, the junction of the tabs of the two grids and the upper edge naturally forms a positioning reference edge, ensuring lateral alignment accuracy during coating. The lower edge of the second grid and the third grid tab are cut at three points through a connecting piece. The connecting piece acts as a transition structure, concentrating scrap material into a single area. The cut third grid tab directly serves as a current conduction path, avoiding material waste caused by traditional hanging strip structures. The two positioning frames are composed of different grid edges and tabs, providing alternating positioning references during continuous coating to prevent cumulative errors caused by wear of a single reference point.

[0014] Furthermore, the third and fourth cutting points are located along the extension direction of the vertical ribs beside the side frames of the third and second grids, respectively, and the cutting paths of the first and second cutting points are parallel to the axial centerline of the grid. The cutting points are vertically aligned with the vertical ribs, utilizing the rigid support of the ribs to reduce lateral offset of the plate during cutting and ensure the straightness of the cut. The vertical ribs serve as positioning references, and during the punching process, their positions are matched with the mold positioning pins, eliminating manual alignment errors. The side frames after cutting retain the complete vertical rib structure, improving the bending resistance of the electrode edges and preventing the active material from falling off due to mechanical stress. The cutting path is parallel to the axial centerline of the grid, ensuring that the movement direction of the cutting tool is consistent with the grid conveying direction, reducing the difficulty of dynamic equipment adjustment.

[0015] Furthermore, recessed sections are provided on both sides of the third, fourth, and fifth cutting points. The upper surface of the recessed sections is lower than the lowest point of the cutting point, and the lowest point of the third cutting point is higher than the lowest point of the recessed sections but lower than the lower edge of the lower frame of the third grid. During cutting, the cutter first contacts the recessed area and gradually cuts into the cutting point depth, reducing the tensile deformation of the grid caused by the instantaneous impact force. The lowest point of the third cutting point is higher than the lowest point of the recessed sections, ensuring that there are no residual protrusions on the lower edge of the lower frame after cutting, preventing burrs from piercing the partition. The recessed sections on both sides of the third and fourth cutting points coincide with the extension lines of the corresponding vertical ribs. The gradient design of the recessed section depth allows the cutting stress to be released along the axial direction of the vertical ribs, avoiding stress concentration in the cutting area.

[0016] Furthermore, the lower edge of the second grid has a thickened portion in the region corresponding to the third slit point, and the thickness increment of the thickened portion is equal to the cutting depth at the third slit point. This localized thickening ensures that the thickness of the lower edge after slits is consistent with the uncut area, maintaining the overall conductivity uniformity of the grid. The thickened portion has a gradual transition and smoothly connects with adjacent ribs, avoiding current density concentration caused by abrupt changes in thickness. This structure is achieved during stamping by adjusting the mold cavity depth, eliminating the need for secondary processing and ensuring production efficiency.

[0017] Furthermore, reinforcing ribs are also provided within the grid formed by the intersection of the horizontal and vertical ribs, and the electrode lugs are positioned in the extending direction of the reinforcing ribs; the reinforcing ribs include at least two and are arranged side by side. The horizontal ribs and reinforcing ribs are arranged perpendicularly to form a composite grid, which improves the creep resistance of the electrode plate and prevents the grid from warping under high temperature conditions.

[0018] Furthermore, the connecting piece has a rectangular structure, with its bottom edge connected to the upper frame of the third grid and its top edge connected to the lower frame of the second grid. The rectangular connecting piece experiences more uniform shear stress distribution during cutting.

[0019] The cutting paths at the first and second cutting points are perpendicular to the extension direction of the horizontal ribs, and the width of the recessed section is equal to the distance between the side frame and the nearest vertical rib. The cutting paths are perpendicular to the extension direction of the horizontal ribs, and the orthogonal grid formed by the horizontal and vertical ribs provides a rigid support surface for the cutting, further suppressing cut deformation caused by cutting vibration.

[0020] Therefore, this utility model has the following beneficial effects:

[0021] The single-row three-piece grid and double positioning frame structure improves the alignment accuracy of the coating plate through two-point positioning reference. At the same time, the continuous arrangement of the three pieces reduces the number of stamping times. With the help of the connecting piece, the scrap material is concentrated to a single area, thus achieving simultaneous optimization of coating plate efficiency and lead material utilization.

[0022] The recessed sections on both sides of the cutting point and the thickened part of the lower frame form a stepped transition, and the cutting stress is released in a gradient along the thickness direction to avoid the generation of burrs and micro-cracks. After cutting, the flatness of the electrode edge meets the requirements of the separator assembly.

[0023] The double reinforcing ribs and orthogonal transverse ribs on the inner side of the electrode tab form a composite grid, which enhances the deformation resistance of the grid and forms a continuous conductive path, improves the uniformity of current distribution, and significantly improves the bonding strength of active materials.

[0024] The combination of connecting pieces and orthogonal cross ribs in the cutting path ensures uniform distribution of punching load, improves the stability of the punching process, and makes the scrap material regular in shape, facilitating recycling and smelting. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model.

[0026] Figure 2 yes Figure 1 A schematic diagram of the structure of a single-plate grid.

[0027] Figure 3 Figure 1 A magnified view of a portion of point A in the middle.

[0028] Figure 4 Figure 1 A magnified view of a section at point B.

[0029] In the figure: 100, Grid unit; 101, First horizontal positioning frame; 102, Second horizontal positioning frame; 1, Grid; 11, Upper frame; 12, Lower frame; 13, Side frame; 14, Horizontal rib; 15, Vertical rib; 2, Pole lug; 3, Reinforcing rib; 4, First cutting point; 5, Second cutting point; 6, Third cutting point; 7, Fourth cutting point; 8, Fifth cutting point; 9, Thickened part; 10, Connecting piece; 16, Recessed section. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] Example 1

[0032] like Figure 1 , 2 As shown, this utility model relates to a lead-acid battery grid, which may include a plurality of grid units 100. Each grid unit 100 includes a plurality of single grid pieces 1. The single grid piece 1 is a rectangular grid structure, including an upper frame 11 and a lower frame 12 arranged along the two short sides of the rectangular grid structure. The two long sides of the rectangular grid structure are side frames 13. The middle part of the rectangular grid structure includes a plurality of intersecting horizontal ribs 14 and vertical ribs 15. An electrode tab 2 is integrally formed on the outer side of the upper frame 11, and the electrode tab 2 extends outward along the plane of the rectangular grid structure.

[0033] like Figure 3 , 4As shown, specifically, the lead-acid battery grid involved in this solution adopts a structure of three grid units 100 arranged in a single row with continuous horizontal distribution. A dual positioning reference is formed by a specific connection method between the tabs 2 and the frame. At the same time, recessed sections 16 and local thickening compensation are set in the cutting area to achieve synergistic optimization of coating accuracy and material utilization. A single grid unit 100 is composed of a first grid, a second grid, and a third grid arranged in sequence. The main body of each grid is a rectangular frame, including a support frame formed by an upper frame 11, a lower frame 12, and two side frames 13. The inside is formed by the orthogonal intersection of horizontal ribs 14 and vertical ribs 15 to form a grid. The tab 2 extends outward from the upper frame 11 of the grid, and its extension direction is parallel to the axial center line of the grid. The tabs 2 of the first grid and the second grid are arranged opposite to each other, and the upper frames 11 of the two are respectively connected to the tabs 2 of the other. The connection point forms the first cutting point 4 and the second cutting point 5. The cutting point is located on the extension line of the second vertical rib 15 next to the corresponding side frame 13. The cutting path is parallel to the axial direction of the grid. After cutting, the junction of the tabs 2 of the first grid and the second grid with the upper frame 11 forms the first horizontal positioning frame 101. The connecting piece 9 has a rectangular structure. Its bottom edge connects to the upper frame 11 of the third grid, and its top edge connects to the lower frame 12 of the second grid. A third cutting point 6 is formed at the junction of the third grid lug 2, the lower frame 12 of the second grid, and one end of the connecting piece 9. A fourth cutting point 7 is formed between the third grid lug 2 and the lower frame 12 of the second grid. The other end of the connecting piece 9 forms a fifth cutting point 8 with the upper frame 11 of the third grid. The third grid lug 2 and the connecting piece 9, together with the lower frame 12 and the upper frame 11 of the third grid, form a second horizontal positioning frame 102. Recessed sections 16 are provided on both sides of each cutting point. The upper surface of the recessed section 16 is lower than the lowest point of the cutting point. The lowest point of the third cutting point 6 is higher than the lowest point of the recessed section 16 and lower than the lower edge of the lower frame 12 of the third grid. The cutting stress is released along the depth gradient of the recessed section 16 to avoid edge burrs. The lower frame 12 of the second grid has a thickened portion 9 in the area corresponding to the third cutting point 6. The thickening amount is equal to the cutting depth, compensating for the thickness loss caused by cutting and making the thickness of the lower frame 12 uniform after cutting. Two parallel reinforcing ribs 3 are provided on the inner side of the electrode tab 2. One end of the reinforcing rib 3 is connected to the upper frame 11, and the other end intersects perpendicularly with the horizontal rib 14 to form a continuous conductive path. In the grid formed by the intersection of the horizontal rib 14 and the vertical rib 15, the reinforcing rib 3 and the adjacent ribs form a composite support structure to improve the grid's resistance to deformation. The transition areas between the two ends of the connecting piece 9 and the upper frame 11 and the lower frame 12 are smooth, reducing stress concentration during stamping. The cutting path is perpendicular to the extension direction of the horizontal rib 14. The orthogonal grid formed by the horizontal rib 14 and the vertical rib 15 provides a rigid support surface for the cutting process and suppresses the deformation of the cut caused by cutting vibration.Two transverse positioning frames alternately provide positioning references during continuous coating. The first transverse positioning frame 101 is enclosed by the upper frame 11 of the first and second grids and the tab 2 to form a rectangular area. The second transverse positioning frame 102 is enclosed by the lower frame 12 of the second grid, the third grid tab 2, the upper frame 11, and the connecting piece 9 to form another area. Two-point positioning eliminates the cumulative error of a single reference. The width of the recessed section 16 is equal to the distance from the side frame 13 to the second vertical rib 15, so that the vertical rib 15 provides lateral restraint when the cutting tool cuts in, and the straightness of the cut is precisely constrained by the extension line of the vertical rib 15. The thickened part 9 adopts a gradual transition structure, with the thickness increment decreasing from the cutting point to both sides, and smoothly connecting with the adjacent ribs to avoid sudden changes in current density.

[0034] In this design, the connecting piece 9 has a rectangular structure, expanding the traditional single-point positioning to dual-reference positioning. Simultaneously, the continuous arrangement of three pieces reduces the stamping process. The connecting piece 9 concentrates scrap material into a single area, significantly reducing lead material loss after slitting. The combined design of the recessed section 16 and the thickened section 9 forms a stress buffer zone during slitting, ensuring uniform distribution of the cutting load along the thickness direction of the grid. The cut section quality meets the edge alignment requirements of the electrode coating layer. The vertically intersecting layout of the reinforcing ribs 3 and transverse ribs 14 forms a multi-directional support network. The current conducted by the electrode tab 2 is diverted to the transverse ribs 14 through the reinforcing ribs 3, reducing interfacial contact resistance. The composite mesh enhances the constraint of the active material, and the expansion stress during charging and discharging is dispersed and absorbed by the rib network.

[0035] In this embodiment, during the production of the lead-acid battery grid, the grid is integrally formed through continuous casting and rolling. The lead alloy molten metal, after being continuously cast into a strip-shaped substrate, enters the stamping process. The stamping die cuts out three horizontally continuously distributed grid units 100 in a single row on the substrate. Each unit includes a first grid, a second grid, and a third grid. The upper frame 11 of the first grid is connected to the tab 2 of the second grid via a die shearing edge, forming a first cutting point 4 at the connection. The upper frame 11 of the second grid is simultaneously connected to the tab 2 of the first grid, forming a second cutting point 5. The two cutting points are located on the extension lines of the second vertical rib 15 beside the corresponding side frame 13. After stamping, the bottom edge of the rectangular connecting piece 9 is integrally formed with the upper frame 11 of the third grid, and the top edge is stamped and joined to the lower frame 12 of the second grid. The two sides of the connecting piece 9 transition vertically, forming a regular rectangular structure.

[0036] In the slitting process, the cutter moves along the axial direction of the grid to cut the first slitting point 4 and the second slitting point 5. The cutter first cuts into the recessed section 16 at the first slitting point 4. The upper surface of the recessed section 16 is lower than the lowest point of the slitting point, and the cutting stress is released along the depth gradient of the recess to avoid tearing at the cut edge. A rectangular first lateral positioning frame 101 is formed at the junction of the tabs 2 of the first grid and the upper frame 11 of the second grid, which serves as the lateral alignment reference for the coating plate. The upper frame 11 of the third grid is connected to the lower frame 12 of the second grid through the rectangular connecting piece 9. The slitting cutter then cuts the third slitting point 6, the fourth slitting point 7, and the fifth slitting point 8 at the junction of the connecting piece 9 and the lower frame 12 of the second grid. The fifth cutting point 8 is located at the junction of the bottom edge of the connecting piece 9 and the upper frame 11 of the third grid. The third cutting point 6 is located at the junction of the top edge of the connecting piece 9 and the lower frame 12 of the second grid. The fourth cutting point 7 is located at the junction of the third grid ear 2 and the lower frame 12 of the second grid. The cutting path is perpendicular to the extension direction of the horizontal rib 14. The orthogonal grid formed by the horizontal rib 14 and the vertical rib 15 provides rigid support for the cutting.

[0037] After slitting, a second transverse positioning frame 102 is formed between the second and third grids. This positioning frame is enclosed by the lower frame 12 of the second grid, the connecting piece 9, and the upper frame 11 of the third grid, and its inner side matches the contour of the guide roller of the coating machine. The scraps generated by the slitting of the connecting piece 9 are regular rectangular fragments, which are collected and recycled by a negative pressure adsorption device. The lower frame 12 of the third grid has a thickened part 9 in the area corresponding to the third slitting point 6. The thickening amount is equal to the slitting depth. After slitting, the thickness of the lower frame 12 is consistent with the uncut area to avoid abrupt changes in the conductive cross section. In the paste coating process, the slitting grids enter the paste coating machine through a conveyor belt. The edge of the first transverse positioning frame 101 contacts the mechanical positioning pin to ensure accurate alignment of the transverse position of the grids. The active substance slurry is pressed into the grid mesh by a scraper. The support network formed by the intersection of the reinforcing ribs 3 and the transverse ribs 14 restricts the transverse flow of the slurry, so that the active substance is evenly filled along the direction of the vertical ribs 15. The current in tab 2 is conducted to the transverse rib 14 through the two reinforcing ribs 3 below. The transverse rib 14 diffuses the current to both sides, reducing the current density at the root of tab 2.

[0038] During production, the dual positioning frames alternately provide reference positioning for lateral positioning during coating plate cutting. The shearing blade of the stamping die adopts a modular design, and the cutting point position can be adjusted according to the spacing of the vertical ribs 15 to adapt to the production needs of different sized grids. The rectangular structure of the connecting piece 9 ensures uniform shape of the cut scraps, reduces the flow resistance of molten lead during smelting and recycling, and reduces material loss. Practical application shows that this solution, using three grids as one grid unit 100, combined with the dual positioning reference, increases the coating speed by 33%, while controlling the cutting burr height within the process requirements, meeting the flatness requirements of diaphragm assembly.

[0039] Example 2

[0040] In this embodiment, the second embodiment of this solution optimizes the layout of the reinforcing ribs 3 on the inner side of the tab 2 while maintaining the core structure of the single-row three-plate grid unit 100 and the double positioning frame.

[0041] Specifically, the lead-acid battery grid involved in this solution adopts a structure of three grid units 100 arranged in a single row with continuous horizontal distribution. A dual positioning reference is formed by a specific connection method between the tabs 2 and the frame. At the same time, recessed sections 16 and local thickening compensation are set in the cutting area to achieve synergistic optimization of coating accuracy and material utilization. A single grid unit 100 is composed of a first grid, a second grid, and a third grid arranged in sequence. The main body of each grid is a rectangular frame, including a support frame formed by an upper frame 11, a lower frame 12, and two side frames 13. The internal structure is formed by the orthogonal intersection of horizontal ribs 14 and vertical ribs 15 to form a grid. The tab 2 extends outward from the upper frame 11 of the grid, and its extension direction is parallel to the axial center line of the grid. The tabs 2 of the first grid and the second grid are arranged opposite to each other, and the upper frames 11 of the two are respectively connected to the tabs 2 of the other. The connection point forms the first cutting point 4 and the second cutting point 5. The cutting point is located on the extension line of the second vertical rib 15 next to the corresponding side frame 13. The cutting path is parallel to the axial direction of the grid. After cutting, the junction of the tabs 2 of the first grid and the second grid with the upper frame 11 forms the first horizontal positioning frame 101. The connecting piece 9 has a rectangular structure. Its bottom edge connects to the upper frame 11 of the third grid, and its top edge connects to the lower frame 12 of the second grid. A third cutting point 6 is formed at the junction of the third grid lug 2, the lower frame 12 of the second grid, and one end of the connecting piece 9. A fourth cutting point 7 is formed between the third grid lug 2 and the lower frame 12 of the second grid. The other end of the connecting piece 9 forms a fifth cutting point 8 with the upper frame 11 of the third grid. The third grid lug 2 and the connecting piece 9, together with the lower frame 12 and the upper frame 11 of the third grid, form a second horizontal positioning frame 102. Recessed sections 16 are provided on both sides of each cutting point. The upper surface of the recessed section 16 is lower than the lowest point of the cutting point. The lowest point of the third cutting point 6 is higher than the lowest point of the recessed section 16 and lower than the lower edge of the lower frame 12 of the third grid. The cutting stress is released along the depth gradient of the recessed section 16 to avoid edge burrs. The lower frame 12 of the second grid has a thickened portion 9 in the area corresponding to the third cutting point 6. The thickening amount is equal to the cutting depth, compensating for the thickness loss caused by cutting and making the thickness of the lower frame 12 uniform after cutting. Two parallel reinforcing ribs 3 are provided on the inner side of the electrode tab 2. One end of the reinforcing rib 3 is connected to the upper frame 11, and the other end intersects perpendicularly with the horizontal rib 14 to form a continuous conductive path. In the grid formed by the intersection of the horizontal rib 14 and the vertical rib 15, the reinforcing rib 3 and the adjacent ribs form a composite support structure to improve the grid's resistance to deformation. The transition areas between the two ends of the connecting piece 9 and the upper frame 11 and the lower frame 12 are smooth, reducing stress concentration during stamping. The cutting path is perpendicular to the extension direction of the horizontal rib 14. The orthogonal grid formed by the horizontal rib 14 and the vertical rib 15 provides a rigid support surface for the cutting process and suppresses the deformation of the cut caused by cutting vibration.Two transverse positioning frames alternately provide positioning references during continuous coating. The first transverse positioning frame 101 is enclosed by the upper frame 11 of the first and second grids and the tab 2 to form a rectangular area. The second transverse positioning frame 102 is enclosed by the lower frame 12 of the second grid, the third grid tab 2, the upper frame 11, and the connecting piece 9 to form another area. Two-point positioning eliminates the cumulative error of a single reference. The width of the recessed section 16 is equal to the distance from the side frame 13 to the second vertical rib 15, so that the vertical rib 15 provides lateral restraint when the cutting tool cuts in, and the straightness of the cut is precisely constrained by the extension line of the vertical rib 15. The thickened part 9 adopts a gradual transition structure, with the thickness increment decreasing from the cutting point to both sides, and smoothly connecting with the adjacent ribs to avoid sudden changes in current density.

[0042] In this design, the connecting piece 9 has a rectangular structure, expanding the traditional single-point positioning to dual-reference positioning. Simultaneously, the continuous arrangement of three pieces reduces the stamping process. The connecting piece 9 concentrates scrap material into a single area, significantly reducing lead material loss after slitting. The combined design of the recessed section 16 and the thickened section 9 forms a stress buffer zone during slitting, ensuring uniform distribution of the cutting load along the thickness direction of the grid. The cut section quality meets the edge alignment requirements of the electrode coating layer. The vertically intersecting layout of the reinforcing ribs 3 and transverse ribs 14 forms a multi-directional support network. The current conducted by the electrode tab 2 is diverted to the transverse ribs 14 through the reinforcing ribs 3, reducing interfacial contact resistance. The composite mesh enhances the constraint of the active material, and the expansion stress during charging and discharging is dispersed and absorbed by the rib network.

[0043] It is worth noting that in the grid unit 100, three parallel reinforcing ribs 3 are provided below the tabs 2 of the first and second grids. Two of the reinforcing ribs 3 are symmetrically distributed along the center line of the tab 2, and the third reinforcing rib 3 is located at the junction of the root of the tab 2 and the upper frame 11. One end of each of the three reinforcing ribs 3 is connected to the tab 2, and the other end extends to the lower frame 12 and intersects perpendicularly with the horizontal rib 14, forming a triangular support network. The width of the middle reinforcing rib is 1.2 times that of the two side reinforcing ribs. The thickness of the rib decreases linearly from the tab 2 to the lower frame 12, with the maximum thickness matching the root of the tab 2 and the minimum thickness consistent with the horizontal rib 14. A circular transition chamfer is provided at the intersection of the reinforcing rib and the horizontal rib 14, with the chamfer radius equal to the width of the horizontal rib 14 to avoid stress concentration. The current conducted by the tab 2 is shunted through the three reinforcing ribs. The middle reinforcing rib bears the main current load, while the two side reinforcing ribs provide auxiliary conductive paths, improving the uniformity of current distribution compared to the double-reinforcing rib structure. During the slitting process, the third reinforcing rib at the root of the tab 2 provides additional support for the slitting point, suppressing the vibration deformation of the upper frame 11 during slitting. In the composite grid formed by the transverse rib 14 and the three reinforcing ribs, the porosity of the active material filling area varies along the axial direction of the tab 2, with the porosity decreasing near the tab 2, thus enhancing the bonding strength between the active material and the grid. The first transverse positioning frame 101 is still enclosed by the upper frame 11 of the first and second grids and the tab 2 to form a rectangular area. The second transverse positioning frame 102 is enclosed by the lower frame 12 of the second grid, the third grid tab 2, and the rectangular connecting piece 9. The slitting point position, the depth gradient of the recessed section 16, and the compensation rules of the thickened part 9 are exactly the same as in the first embodiment. The bottom edge of the rectangular connecting piece 9 is connected to the third grid tab 2, and the top edge is connected to the lower frame 12 of the second grid. The two sides transition vertically, and the shape of the scrap material formed by slitting is regular. In the parallel scheme, the number of reinforcing ribs can be adjusted to four, but it is necessary to ensure symmetrical distribution and that the width of the middle rib is greater than that of the two sides. This embodiment further enhances the mechanical strength and current carrying capacity of the grid by increasing the number of reinforcing ribs and optimizing the rib size distribution. The triangular support network effectively disperses the expansion stress of the active material during charging and discharging, reducing the risk of electrode warping. At the same time, the reinforcing ribs at the base of the electrode tabs play a key supporting role in the stability of the stamping and cutting process.

Claims

1. A lead-acid battery grid web, characterized by, It includes several grid units, and each grid unit includes three grids arranged in a single row in a continuous transverse direction, namely a first grid, a second grid, and a third grid; The first grid and the second grid have their tabs facing each other and form a first lateral positioning frame at their junction; the third grid has its tab attached to the side of the second grid away from the tab and forms a second lateral positioning frame at their junction.

2. The lead-acid battery grid according to claim 1, characterized in that, The grid includes an upper frame and a lower frame, which are connected by two side frames to form a rectangular frame; the rectangular frame has tabs extending outward; and the rectangular frame has several intersecting horizontal and vertical ribs forming a grid.

3. A lead-acid battery grid according to claim 2, wherein, The upper edge of the first grid is connected to the tab of the second grid, and the upper edge of the second grid is connected to the tab of the first grid. The connection points form a first cutting point and a second cutting point. The first cutting point is located at the junction of the upper edge of the first grid and the tab of the second grid, and the second cutting point is located at the junction of the upper edge of the second grid and the tab of the first grid. The upper edge of the first grid, the upper edge of the second grid, and their tabs together form a first horizontal positioning frame. The lower edge of the second grid is connected to the tab of the third grid and forms a fourth cutting point. A connecting piece is also provided between the upper edge of the third grid and the lower edge of the second grid. The two ends of the connecting piece form a third cutting point and a fifth cutting point. The lower edge of the second grid, the tab of the third grid, and the connecting piece together form a second horizontal positioning frame.

4. A lead-acid battery grid according to claim 3, wherein, The third and fourth cutting points are located on the extension lines of the nearest vertical ribs next to the side frames of the third and second grids, respectively; the cutting paths of the first and second cutting points are parallel to the axial center line of the grid.

5. A lead-acid battery grid according to claim 3, wherein, The third, fourth, and fifth cutting points are provided with recessed sections on both sides. The upper surface of the recessed section is lower than the lowest point of the cutting point, and the lowest point of the third cutting point is higher than the lowest point of the recessed section and lower than the lower edge of the lower frame of the third grid.

6. The lead-acid battery grid web of claim 3, wherein, The lower edge of the second grid is provided with a thickened portion in the area corresponding to the third dividing point, and the thickness increment of the thickened portion is equal to the cutting depth of the third dividing point.

7. A lead-acid battery grid according to claim 2 or 3, characterised in that, The grid formed by the intersection of the horizontal and vertical ribs is further provided with reinforcing ribs, and the electrode lugs are provided in the extending direction of the reinforcing ribs; the reinforcing ribs include at least two and are arranged side by side.

8. The lead-acid battery grid web of claim 3, wherein, The connecting piece has a rectangular structure, with its bottom edge connected to the upper frame of the third grid and its top edge connected to the lower frame of the second grid.

9. The lead-acid battery grid according to claim 5, characterized in that, The cutting paths of the first and second cutting points are perpendicular to the extension direction of the horizontal rib, and the width of the recessed section is equal to the distance between the side frame and the nearest vertical rib.

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