Creep reinforced composite structure grid

Abstract

Vertical ribs are divided into middle vertical ribs and side vertical ribs on the two sides, the two ends of each middle vertical rib are connected with an upper frame rib and a lower frame rib respectively, the number of the middle vertical ribs is at least two, and the number of the side vertical ribs is at least two. Transverse ribs are arranged between the adjacent middle vertical ribs, so that the middle vertical ribs can support the structural strength of the whole grid in the vertical direction; on the other hand, the upper ends of the side vertical ribs are connected with the upper frame ribs, the lower ends of the side vertical ribs are not connected with the lower frame ribs, and inclined ribs are arranged between the side vertical ribs and the adjacent vertical frame ribs and between the side vertical ribs and the middle vertical ribs, so that the lower part of the side vertical rib structure can properly creep; and the phenomenon that the vertical ribs are stressed and broken due to the expansion of the active substance in the use process of the ribs in the grid is avoided, so that the improvement of the battery performance and the prolonging of the cycle life are facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a grid with a creep-enhanced composite structure. Background Technology

[0002] In existing technologies, lead alloy grids are widely used in the manufacture of various lead-acid battery grids. However, gravity-cast grids with traditional structures and processes suffer from problems such as excessive weight and poor tensile strength.

[0003] While existing grid structures reduce weight, conventional grid designs, such as quadrilateral, diamond, or radial ribs, are prone to stress concentration during battery cycling under tight assembly conditions. This is due to the contraction and expansion of the active material during charging and discharging, causing the horizontal and vertical ribs of the grid to bear multi-directional stress. This stress concentration can lead to the breakage of the horizontal ribs connected to the frame ribs. Furthermore, uneven current distribution can induce localized polarization, accelerating irreversible sulfation of the active material and ultimately causing battery failure.

[0004] Existing patents propose using honeycomb or triangular structures to enhance the strength of lead alloys and prevent electrode creep deformation. However, such structures have drawbacks that hinder large-scale production, including the inability to reduce grid weight, high processing difficulty, and complex mold structures.

[0005] For example, the utility model with authorization announcement number CN211208576U discloses a creep-resistant triangular plate grid.

[0006] In view of the failure modes and defects of lead-acid batteries, there is an urgent need to develop a grid structure that is cost-comparable to existing products, easy to process, and whose grid can adapt to the shrinkage and expansion changes of active materials during cycling, ensuring that the ribs do not break and has better performance. Utility Model Content

[0007] This invention addresses the aforementioned shortcomings in the existing technology by providing a creep-reinforced composite structure plate grid.

[0008] A creep-reinforced composite structure grid includes a frame formed by an upper frame rib, a lower frame rib, and two vertical frame ribs on both sides. The upper frame rib is provided with a tab. The frame is provided with a plurality of vertical ribs at intervals. Each vertical rib is divided into a middle vertical rib and two side vertical ribs.

[0009] The middle vertical rib is connected to the upper frame rib and the lower frame rib at both ends, and the middle vertical rib includes at least two ribs, with a horizontal rib between adjacent middle vertical ribs;

[0010] The upper end of the edge vertical rib is connected to the upper frame rib, and the lower end is not connected to the lower frame rib. There are diagonal ribs between the edge vertical rib and the adjacent vertical frame rib and the middle vertical rib.

[0011] Preferably, the vertical ribs include two ribs, located on both sides respectively.

[0012] More preferably, the oblique ribs provided between the edge vertical ribs and the adjacent intermediate vertical ribs are obliquely upward, wherein there is an oblique rib at each of the upper and lower ends of the edge vertical ribs.

[0013] More preferably, the diagonal ribs provided between the vertical edge ribs and the adjacent vertical frame ribs are arranged diagonally upward and diagonally downward at intervals, thereby forming a triangular structure.

[0014] Preferably, the angle between the diagonal rib and the vertical rib is 40° to 70°.

[0015] Preferably, the thickness of the vertical ribs gradually decreases from the upper frame rib end to the lower frame rib end.

[0016] Preferably, the lower frame rib has a support foot that protrudes downward near the vertical rib of the side.

[0017] Preferably, the number of the intermediate vertical ribs is 2.

[0018] More preferably, a reinforcing vertical rib is provided between the middle of a horizontal rib near the upper frame rib and the upper frame rib.

[0019] This invention features a creep-reinforced composite grid structure divided into central vertical ribs and side vertical ribs. The central vertical ribs are connected to upper and lower frame ribs at both ends, and each central vertical rib comprises at least two ribs. Horizontal ribs are provided between adjacent central vertical ribs, thus supporting the overall grid's vertical structural strength. Conversely, the side vertical ribs are connected to the upper frame ribs at their upper ends but not to the lower frame ribs at their lower ends. Diagonal ribs are provided between the side vertical ribs and adjacent vertical frame ribs and central vertical ribs. This allows for appropriate creep at the bottom of the side vertical rib structure, preventing breakage of the internal grid ribs due to the expansion of active materials during use, thereby improving battery performance and extending cycle life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the creep-reinforced composite grid of this utility model.

[0021] Attached reference numerals: 1. Upper frame rib; 2. Lower frame rib; 3. Vertical frame rib; 4. End lug; 5. Middle vertical rib; 6. Side vertical rib; 7. Horizontal rib; 8. Diagonal rib; 9. Diagonal rib; 10. Support leg; 11. Reinforcing vertical rib; 12. Detailed Implementation

[0022] like Figure 1 As shown, a creep-reinforced composite structure grid includes a frame formed by an upper frame rib 1, a lower frame rib 2, and two vertical frame ribs 3 on both sides. The upper frame rib 1 is provided with a tab 4, which is designed to be offset, that is, the tab 4 is located on one side of the vertical frame rib 3 of the upper frame rib 1.

[0023] The frame is provided with several vertical ribs at intervals. Each vertical rib is divided into a middle vertical rib 5 and two side vertical ribs 6. The middle vertical rib 5 is located in the middle area, and the two side vertical ribs 6 are located in the area close to the two side vertical frame ribs 3.

[0024] The two ends of the central vertical rib 5 are respectively connected to the upper frame rib 1 and the lower frame rib 2. The central vertical rib 5 includes at least two ribs, and a horizontal rib 7 is provided between adjacent central vertical ribs 5. In a preferred embodiment, such as Figure 1 As shown, there are two vertical ribs 5 in the middle. Among them, a reinforcing vertical rib 12 is provided between the middle of the horizontal rib 7 near the upper frame rib 1 and the upper frame rib 1 to strengthen the structure.

[0025] One to two vertical reinforcing bars 6 are provided on each side of the central area formed by the central vertical reinforcing bar 5 and the transverse reinforcing bars 7, preferably arranged in the following order. Figure 1 The structure shown has two vertical ribs 6, one on each side.

[0026] The upper end of the edge vertical rib 6 is connected to the upper frame rib 1, but the lower end is not connected to the lower frame rib 2. Diagonal ribs are provided between the edge vertical rib 6 and the adjacent vertical frame rib 3 and the middle vertical rib 5. The diagonal ribs provided between the edge vertical rib 6 and the adjacent middle vertical rib 5 are angled upwards, i.e. Figure 1 The diagonal rib 9 extends diagonally upwards from the edge vertical rib 6 toward the middle vertical rib 5, with the angle between the diagonal rib 9 and the vertical direction being 40° to 70°. Preferably, the diagonal rib 9 and the transverse rib 7 are connected at positions corresponding to the middle vertical rib 5, thereby connecting the diagonal rib 9 and the transverse rib 7.

[0027] The vertical rib 6 is located at both the top and bottom ends of a diagonally downward-pointing rib 10, forming a triangular structure at the four corners of the entire grating to strengthen the structure at the four corners. The diagonally downward-pointing rib 10 extends from the vertical rib 6 towards the central vertical rib 5, with the angle between the diagonally downward-pointing rib 10 and the vertical rib being 40° to 70°.

[0028] The diagonal ribs 8 between the vertical edge ribs 6 and the adjacent vertical edge ribs 3 are spaced diagonally upwards and downwards, forming a triangular structure. This triangular structure is relatively stable and strengthens the structure. The adjacent diagonal ribs 8 are connected end-to-end in a zigzag pattern. The positions where the diagonal ribs 8 connect to the vertical edge ribs 6 are the same as the positions where the diagonal ribs 9 connect to the vertical edge ribs 6. The angle between the diagonal ribs 9 and the vertical axis is 40° to 70°.

[0029] The thickness of each vertical rib (including the middle vertical rib 5 and the side vertical rib 6) gradually decreases from the upper frame rib 1 end to the lower frame rib 2 end, that is, the vertical ribs are thicker at the top and thinner at the bottom, which is conducive to the current converging at the electrode tab 4.

[0030] The lower frame rib 2 has a support foot 11 protruding downward near the edge vertical rib 6. The support foot 11 is aligned with the edge vertical rib 6 to increase the space for the grid to creep.

[0031] After the grid is fabricated into plates, the plates are assembled into a battery. Due to the limitations of the battery's internal assembly, the vertical height of the grid cannot easily grow upwards or downwards. During battery charge-discharge cycles, the active material contracts and expands, and the grid's edge is subjected to forces from the active material in four directions: upwards, downwards, leftwards, and rightwards. Among these, the forces from the top and bottom creep towards the vertical edge ribs 3 on both sides, thanks to the triangular structure formed by the non-direct connection between the side vertical ribs 6 and the bottom edge ribs 2. The support feet 11 are supported on the bottom surface inside the battery case, so they cannot creep. However, the bottom edge ribs 2 can creep downwards in the area between the two support feet 11 to withstand the elongation creep of the middle vertical rib 5.

[0032] When the vertical frame ribs 3 of the grid extend laterally to both sides, the triangular structure at the diagonal ribs 8 reduces the impact of lateral creep on the grid.

[0033] This utility model features a creep-enhanced composite grid. Through the design of the creep structure, the creep direction of the grid is guided during use, preventing the vertical ribs inside the grid from breaking due to the expansion of active materials during use. This is beneficial to improving battery performance and extending cycle life.

Claims

1. A creep-reinforced composite structure grid, comprising a frame formed by an upper frame rib, a lower frame rib, and two vertical frame ribs on both sides, wherein the upper frame rib is provided with a tab, characterized in that, The frame is provided with a number of vertical ribs at intervals, and each vertical rib is divided into a middle vertical rib and two side vertical ribs; The middle vertical rib is connected to the upper frame rib and the lower frame rib at both ends, and the middle vertical rib includes at least two ribs, with a horizontal rib between adjacent middle vertical ribs; The upper end of the edge vertical rib is connected to the upper frame rib, and the lower end is not connected to the lower frame rib. There are diagonal ribs between the edge vertical rib and the adjacent vertical frame rib and the middle vertical rib.

2. The creep-reinforced composite structure grid according to claim 1, characterized in that, The vertical ribs consist of two pieces, located on both sides respectively.

3. The creep-reinforced composite structure grid according to claim 2, characterized in that, The oblique ribs between the edge vertical ribs and the adjacent middle vertical ribs are obliquely upward, and there is an oblique rib at each of the upper and lower ends of the edge vertical ribs.

4. The creep-reinforced composite structure grid according to claim 2, characterized in that, The diagonal ribs between the vertical ribs and the adjacent vertical frame ribs are arranged diagonally upwards and downwards at intervals, thus forming a triangular structure.

5. The creep-reinforced composite structure grid according to claim 1, characterized in that, The angle between the diagonal stiffener and the vertical stiffener is 40° to 70°.

6. The creep-reinforced composite structure grid according to claim 1, characterized in that, The thickness of the vertical ribs gradually decreases from the upper frame rib end to the lower frame rib end.

7. The creep-reinforced composite structure grid according to claim 1, characterized in that, The lower frame rib has a support foot that protrudes downward near the vertical rib of the edge.

8. The creep-resistant reinforced composite structure grid according to claim 1, characterized in that, The number of the intermediate vertical ribs is 2.

9. The creep-reinforced composite structure grid according to claim 8, characterized in that, A reinforcing vertical rib is provided between the middle of a horizontal rib near the top frame rib and the top frame rib.

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