Grid structure

Abstract

The utility model discloses a grid structure, which relates to the technical field of lead-acid storage batteries and comprises a rectangular frame, a tab connected to the upper part of one edge of the frame and a rib with two ends connected with the frame, and the rib connected between the edge where the tab is located and the opposite edge of the tab is gradually thickened towards the direction of the tab. At least the joints of the ribs connected between the side where the tab is located and the opposite side of the tab and the side where the tab is located are thickened in a trapezoid shape, and the ribs jointly divide the interior of the frame into a plurality of isosceles right triangle areas. According to the utility model, the corrosion resistance and the structural stability of the grid are greatly improved, the utilization rate of active substances is more uniform, the confluence effect is fully improved, and finally, the service life of a storage battery is greatly prolonged.

Description

Technical Field

[0001] This utility model relates to the field of lead-acid battery technology, and more specifically, to a grid structure. Background Technology

[0002] Lead-acid batteries (hereinafter referred to as batteries) are widely used as power sources for electric bicycles, sightseeing vehicles, electric forklifts, cleaning vehicles, electric construction machinery, and other equipment, and can even be the sole power source for these devices. The reliability and lifespan of batteries play a crucial role in the operating costs and resource conservation of these devices. Failure mode analysis of batteries at the end of their service life reveals that the main failure modes are positive electrode grid corrosion, positive electrode active material sludge formation, and negative electrode active material sulfation. Positive electrode grid corrosion is mostly characterized by corrosion and fracture between the frame and the reinforcing ribs, or corrosion of the upper half of the grid. This prevents the electrical energy generated by the active material from being conducted to the grid, leading to capacity decay or even complete battery failure.

[0003] Existing research on grids, such as patent application CN109860622A on a curved grid structure for lead-acid batteries, all involve grids that include tabs, ribs, and a rectangular frame. The tabs are connected to the upper part of one side of the frame, and both ends of the ribs are connected to the frame. By coordinating the ribs connected between the side where the tab is located and the opposite side, the ribs gradually thicken towards the tab, which improves the corrosion resistance and current collection effect to a certain extent and extends the service life of the battery.

[0004] However, existing technologies still suffer from corrosion and breakage at the connection between the ribs and the frame, offering limited improvement in corrosion resistance. Furthermore, most existing grid designs use rectangular or parallelogram grids, resulting in generally weak grid structural stability. Additionally, the distance between the active material in the middle of the grid and the adjacent ribs is relatively large, leading to low utilization of the active material in the middle of the battery during discharge, especially under high current discharge and low charge conditions. This uneven utilization of active material results in uneven contraction and expansion of the active material during charging and discharging, which can easily lead to localized softening, shedding, and sulfation of the active material. Moreover, the improvement in current collection efficiency remains limited, ultimately affecting the battery's lifespan.

[0005] Therefore, a new technical solution is needed to solve the above-mentioned technical problems. Utility Model Content

[0006] The purpose of this utility model is to provide a grid structure to solve the problem that the existing technology mentioned in the background art still has limited improvement in corrosion resistance. At the same time, most of the grids in the existing technology are mainly designed with rectangular or parallelogram grids, which generally result in poor structural stability of the grid. In addition, the distance from the active material in the middle of the unit grid to the adjacent ribs is relatively large, which leads to uneven utilization of the active material in each unit grid. The improvement in current collection effect is still limited, and ultimately the service life of the battery is also generally poor.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A plate grid structure includes a rectangular frame, a tab connected to the upper part of one side of the frame, and ribs connected to the frame at both ends. The ribs connected between the side where the tab is located and the opposite side gradually thicken towards the tab. At least the connection between the ribs connected between the side where the tab is located and the opposite side and the side where the tab is located is trapezoidally thickened. The ribs together divide the interior of the frame into multiple isosceles right-angled triangular regions.

[0009] Furthermore, the frame is formed by a horizontally arranged upper frame and a bottom frame, and two vertically arranged side frames. The tab is connected to the upper part of the upper frame. The ribs include multiple horizontal ribs, vertical ribs, left diagonal ribs, and right diagonal ribs that are parallel to each other. The left diagonal ribs and right diagonal ribs are perpendicular to each other. The upper frame is wider closer to the tab between the two side frames. The vertical ribs are connected between the upper frame and the bottom frame and gradually thicken towards the upper frame. The horizontal ribs are perpendicular to each other. The horizontal ribs are connected between the two side frames. The connection between the vertical ribs and the upper frame, and the connection between the horizontal ribs and the side frames, are all trapezoidally thickened. The connection between the vertical ribs and the upper frame, the connection between the vertical ribs and the bottom frame, and the connection between the horizontal ribs and the side frames are all connected to left diagonal ribs and right diagonal ribs, respectively. The intersections of the horizontal ribs and the vertical ribs, and the intersections of the left diagonal ribs and the right diagonal ribs, are all rounded. The intersections of the horizontal ribs and the vertical ribs are also joined by left diagonal ribs and right diagonal ribs.

[0010] Furthermore, the cross-sections of the frame and vertical ribs are both hexagonal, the cross-sections of the left and right diagonal ribs are both rhomboid, the cross-section of the horizontal ribs is pentagonal, and the pentagonal structures of any two adjacent horizontal ribs are centrally symmetrical. The horizontal ribs are asymmetrical in the thickness direction, and the center line of the frame and the center line of the horizontal ribs in the thickness direction are located in the same plane.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. In this utility model, the tab is connected to the upper part of one side of the rectangular frame. The frame has ribs at both ends connected to the frame. The ribs connecting the tab side and its opposite side gradually thicken towards the tab. This gradual design not only initially improves the current-carrying effect but also enhances the current-carrying capacity of the ribs near the tab, where the current is higher near the tab and lower further away, thus preventing corrosion of the grid, especially the upper part of the grid, caused by excessive local current. Furthermore, this utility model significantly strengthens the connection between the ribs and the frame by using a trapezoidal thickening at the connection point between the tab side and its opposite side, effectively reducing corrosion and breakage at this connection point. This greatly improves the corrosion resistance of the grid and initially extends the battery's lifespan. In this invention, the ribs work together to divide the interior of the frame into multiple isosceles right-angled triangular regions. Compared to the conventional rectangular or parallelogram grid design inside the grid, this not only significantly improves the structural stability of the grid and effectively reduces grid deformation caused by the expansion of active material during deep cycling, but also greatly shortens the distance that the active material in the middle of the unit grid is conducted to the adjacent ribs. This improves the uniformity of the overall active material utilization rate of the grid and solves the problem of localized softening, shedding, and sulfation of active material due to uneven utilization, thereby significantly extending the battery's lifespan. In addition, the division of the frame into multiple isosceles right-angled triangular regions allows the electrical energy generated by the active material to be evenly collected at the tabs, further improving the current collection effect, enhancing battery performance, and fully guaranteeing the battery's lifespan.

[0013] 2. The frame of this utility model is formed by a horizontally arranged upper frame and a bottom frame, and two vertically arranged side frames. The tabs are connected to the upper part of the upper frame, the vertical ribs are connected between the upper frame and the bottom frame, and the horizontal ribs are connected between the two side frames. In this utility model, the connection between the vertical ribs and the upper frame, as well as the connection between the horizontal ribs and the side frames, are all trapezoidally thickened, which further reduces the occurrence of corrosion and breakage at the connection between the ribs and the frame, thereby further improving the corrosion resistance of the grid.

[0014] 3. In this utility model, the upper frame is wider as it gets closer to the tab between the two side frames. When the current is high near the tab and low far from the tab, the strength of the upper frame near the tab is effectively enhanced, thus improving the current carrying capacity at this location. This further avoids corrosion of the grid, especially the upper part of the grid, caused by excessive local current, and further ensures the corrosion resistance of the grid.

[0015] 4. In this invention, the intersections of the horizontal and vertical ribs, as well as the intersections of the left and right diagonal ribs, are all rounded. This gives the grid better current carrying capacity and corrosion resistance, and also allows for better filling of active materials, thereby improving the battery's service life. Meanwhile, the horizontal ribs in this invention have a pentagonal cross-section and an asymmetrical structure in the thickness direction. The pentagonal structures of any two adjacent horizontal ribs are centrally symmetrical, and the center line of the frame and the center line of the horizontal rib in the thickness direction are on the same plane. This alternating arrangement of the asymmetrical structure of the horizontal ribs also facilitates the filling of active materials, further ensuring the battery's service life. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 The electrode tab of this utility model is Figure 1 A cross-sectional view along the AA direction in the diagram;

[0018] Figure 3 The upper frame of this utility model is in Figure 1 A cross-sectional view along the BB direction in the diagram;

[0019] Figure 4 The side frame of this utility model is in Figure 1 A cross-sectional view along the CC direction in the diagram;

[0020] Figure 5 The vertical rib of this utility model is Figure 1 A cross-sectional view along the DD direction in the diagram;

[0021] Figure 6 For the transverse rib of this utility model Figure 1 A cross-sectional view along the EE direction in the diagram;

[0022] Figure 7 This is a schematic diagram illustrating the working principle of the horizontal rib of this utility model;

[0023] Figure 8 The left diagonal reinforcement of this utility model is in Figure 1 A cross-sectional view along the FF direction in the diagram;

[0024] Figure 9 The right diagonal reinforcement of this utility model is in Figure 1 A cross-sectional view along the GG direction in the diagram;

[0025] Figure 10 The bottom frame of this utility model is in Figure 1 A cross-sectional view along the HH direction in the diagram;

[0026] Figure 11 for Figure 1 A magnified view of a section at point I;

[0027] Figure 12 for Figure 1 A magnified view of a section at point J;

[0028] Figure 13 for Figure 1 A magnified view of a section at point K;

[0029] Figure 14 for Figure 1 A magnified view of a section at point L;

[0030] In the diagram: 1. Pole lug, 2. Top frame, 3. Side frame, 4. Bottom frame, 5. Vertical rib, 6. Left diagonal rib, 7. Right diagonal rib, 8. Horizontal rib, 9. Connection I, 10. Connection II, 11. Intersection I, 12. Intersection II, 13. Connection III, 14. Center line I, 15. Center line II. Detailed Implementation

[0031] The following embodiments are used to further illustrate the content of this utility model, and do not limit the application of this utility model.

[0032] Please see Figures 1 to 14 The diagram illustrates a lattice structure, comprising a rectangular frame enclosed by an upper frame 2, a bottom frame 4, and two side frames 3; tabs 1 connected to the upper part of the upper frame 2; and vertical ribs 5, left diagonal ribs 6, right diagonal ribs 7, and horizontal ribs 8 that divide the interior of the frame into multiple congruent isosceles right-angled triangular regions, each connected to the frame at both ends. The upper frame 2 and the bottom frame 4 are horizontally arranged, and multiple vertical ribs 5 are parallel and connected between the upper frame 2 and the bottom frame 4. The two side frames 3 are vertically arranged... The horizontal ribs 8 are arranged in parallel and are all connected between the two side frames 3. The vertical ribs 5 are perpendicular to the horizontal ribs 8, and the intersection of the horizontal ribs 5 and the vertical ribs 8, II12, also intersects with the left diagonal ribs 6 and the right diagonal ribs 7. The left diagonal ribs 6 and the right diagonal ribs 7 are perpendicular to each other, and the left diagonal ribs 6 and the right diagonal ribs 7 are arranged in parallel. The connection between the vertical ribs 5 and the upper frame 2, the connection between the vertical ribs 5 and the bottom frame 4, III13, and the connection between the horizontal ribs 8 and the side frame 3, II10, are all connected with the left diagonal ribs 6 and the right diagonal ribs 7, respectively.

[0033] Furthermore, the cross-sections of the frame and vertical rib 5 are hexagonal, the cross-sections of the left diagonal rib 6 and the right diagonal rib 7 are rhomboid, the cross-section of the horizontal rib 8 is pentagonal and has an asymmetrical structure in the thickness direction, and the pentagons of any two adjacent horizontal ribs 8 are centrally symmetrically arranged. The center line II15 of the frame and the center line I14 of the horizontal rib 8 in the thickness direction are located in the same plane.

[0034] Furthermore, the upper frame 2 becomes wider as it approaches the tab 1 between the two side frames 3, the vertical rib 5 gradually thickens towards the upper frame 2, the connection point I9 between the vertical rib 5 and the upper frame 2, and the connection point II10 between the horizontal rib 8 and the side frame 3 are all thickened in a trapezoidal shape, and the intersection point II12 between the horizontal rib 8 and the vertical rib 5, and the intersection point I11 between the left diagonal rib 6 and the right diagonal rib 7 are all rounded.

[0035] The working principle and workflow of this utility model are as follows:

[0036] During battery use, the current is high near the electrode 1 on the frame and low further away from the electrode 1. Therefore, the width of the upper frame 2 near the electrode 1 is wider, and the width of the end further away from the electrode 1 is narrower. Similarly, the vertical rib 5 experiences high current and potential near the upper frame 2, and low current further away. Considering the current collection effect, the vertical rib 5 is thickened near the upper frame 2 and thinned further away, creating a gradient design from top to bottom. With increasing charge and discharge cycles, the grid may corrode and grow. This growth and deformation can easily cause corrosion and breakage at the connection point I9 between the vertical rib 5 and the upper frame 2, and at the connection point II10 between the horizontal rib 8 and the side frame 3. Therefore, connection point I9... Both the connection point II10 and the connection point II12 adopt a trapezoidal reinforcement design; the intersection of the horizontal rib 8 and the vertical rib 5 II12, and the intersection of the left diagonal rib 6 and the right diagonal rib 7 I11, need to carry a larger current. Therefore, the intersection points I11 and II12 are rounded to improve current carrying capacity and corrosion resistance, and also to better fill the active material. Finally, the vertical rib 5, the left diagonal rib 6, the right diagonal rib 7 and the horizontal rib 8 together divide the interior of the frame into multiple isosceles right-angled triangular areas, which can evenly collect the electrical energy generated by the active material to the tab 1 and make the grid structure stable. Ultimately, through the above settings, the battery has a longer service life.

[0037] In addition, the grid can be an integral lead-calcium-tin-aluminum alloy grid made by gravity casting (alloy composition: tin 1.0-2.5%, calcium: 0.03-0.14%, aluminum content: 0.02-0.05%, the remainder is lead).

Claims

1. A plate grid structure, comprising a rectangular frame, a tab connected to the upper part of one side of the frame, and ribs connected to the frame at both ends, wherein the ribs connecting the side containing the tab and its opposite side gradually thicken towards the tab, characterized in that, At least the ribs connecting the side where the tab is located and its opposite side are thickened in a trapezoidal shape at the connection point with the side where the tab is located, and the ribs together divide the interior of the frame into multiple isosceles right-angled triangular regions.

2. The plate grid structure according to claim 1, characterized in that, The reinforcing bars include multiple horizontal reinforcing bars, vertical reinforcing bars, left diagonal reinforcing bars, and right diagonal reinforcing bars that are parallel to each other. The horizontal reinforcing bars are perpendicular to the vertical reinforcing bars, and the left diagonal reinforcing bars are perpendicular to the right diagonal reinforcing bars.

3. A plate grid structure according to claim 2, characterized in that, The frame is formed by a horizontally arranged upper frame and a bottom frame, and two vertically arranged side frames. The tab is connected to the upper part of the upper frame. The vertical rib is connected between the upper frame and the bottom frame and gradually thickens towards the upper frame. The horizontal rib is connected between the two side frames.

4. A plate grid structure according to claim 3, characterized in that, The upper frame becomes wider as it gets closer to the tab between the two side frames.

5. A plate grid structure according to claim 3, characterized in that, The intersections of the horizontal and vertical ribs, as well as the intersections of the left and right diagonal ribs, are all rounded.

6. A plate grid structure according to claim 5, characterized in that, The intersections of the horizontal and vertical reinforcing bars are also joined by left and right diagonal reinforcing bars.

7. A plate grid structure according to claim 3, characterized in that, The connection points between the vertical ribs and the top frame, as well as the connection points between the horizontal ribs and the side frame, are all thickened in a trapezoidal shape.

8. A plate grid structure according to claim 7, characterized in that, The vertical ribs are connected to the top frame, the bottom frame, and the side frame, respectively, with left and right diagonal ribs.

9. A plate grid structure according to claim 3, characterized in that, The cross-sections of the frame and vertical ribs are hexagonal, the cross-sections of the left and right diagonal ribs are rhomboid, and the cross-sections of the horizontal ribs are pentagonal with any two adjacent horizontal ribs arranged centrally symmetrically.

10. A plate grid structure according to claim 9, characterized in that, The horizontal ribs have an asymmetrical structure in the thickness direction, and the center line of the frame and the center line of the horizontal ribs in the thickness direction are located in the same plane.

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