Wide plate structure and lead-acid battery

Abstract

The present application relates to a kind of wide type plate structure, belong to lead-acid battery technical field, solve the improper ratio of width to height of the plate of existing lead-acid battery, lead to the reaction rate of each part on the plate is inconsistent, bring the problems such as plate corrosion and creep.The ratio of the plate width A of the wide type plate provided by the present application to the plate height B is in the range of 1:1-2:1.The present application is by optimizing the ratio of width to height of lead-acid battery plate, and then improve the uniformity of the electrochemical reaction intensity of each part of battery plate under charge and discharge conditions, and then improve the comprehensive performance such as specific energy, specific power and cycle life of battery.

Description

Technical Field

[0001] This invention relates to the field of lead-acid battery technology, and more particularly to a wide-plate structure and a lead-acid battery. Background Technology

[0002] Lead-acid batteries for electric vehicles have been widely developed due to their advantages such as safety, reliability, affordability, and recyclability. Since the traditional lead-acid battery structure is mainly developed for new applications based on existing battery cases or existing designs, electric vehicle batteries use the casings of previous UPS lead-acid batteries or small valve-regulated sealed lead-acid batteries. Therefore, their internal structure is also similar to the aforementioned battery designs.

[0003] Lead-acid battery plates consist of plates and active materials. The plates, as the supporting framework for the conductive network and active materials, are undeniably crucial. Among the failure modes of lead-acid batteries, plate corrosion and fracture, as well as creep deformation, are major contributing factors.

[0004] Intense localized reactions on battery plates, excessive utilization, and excessive current density are among the main causes of plate corrosion. Currently, most power batteries on the market have an excessively small aspect ratio. This leads to electrolyte stratification, uneven utilization of active materials, and uneven current distribution, which worsens and accelerates plate corrosion and creep.

[0005] An inappropriate aspect ratio of the battery plates leads to inconsistent reaction rates and utilization rates across different parts of the plates. This uneven reaction causes the areas with the strongest reactions to experience performance degradation first, while other areas often remain ineffective. As the number of battery cycles (or usage time) increases, this imbalance worsens, creating a vicious cycle that significantly shortens the battery's lifespan.

[0006] The new national standard for electric bicycles has imposed restrictions on the weight of batteries, requiring that the total weight (including the battery) not exceed 55kg and that there must be a foot pedal position. This means that the installation dimensions of the battery need to be adjusted. Summary of the Invention

[0007] Based on the above analysis, the present invention aims to provide a wide-plate structure and a lead-acid battery to solve the problem that the aspect ratio of the plates in existing lead-acid batteries is inappropriate, resulting in inconsistent reaction rates at different parts of the plates, leading to plate corrosion and creep.

[0008] The objective of this invention is mainly achieved through the following technical solutions:

[0009] On the one hand, the present invention provides a wide electrode structure; the ratio of electrode width A to electrode height B is in the range of 1:1-2:1.

[0010] In one possible design, the wide electrode structure is rectangular; the electrode width A of the wide electrode is greater than the electrode height B.

[0011] In one possible design, the wide plate includes a frame, which includes a top frame, a bottom frame, a left frame, and a right frame.

[0012] The frame is provided with multiple ribs, including multiple first ribs distributed laterally along the electrode plate surface and multiple second ribs distributed longitudinally along the electrode plate surface. Each first rib is V-shaped with its opening facing the upper frame.

[0013] The included angle of the V-shape is 90°-180°.

[0014] In one possible design, the wide electrode plate also includes electrode tabs;

[0015] The electrode includes a first electrode and a second electrode. The first electrode and the second electrode are symmetrically arranged on the upper frame along the length of the upper frame. The plane containing the first electrode and the second electrode is parallel to the electrode plate surface.

[0016] The first and second electrodes are the same size. The distance d between the first and second electrodes is related to the width w of the first electrode and the length L of the upper frame as follows: L≥d+2w.

[0017] In one possible design, the wide electrode plate includes a frame, which includes a connected upper frame, a lower frame, a left frame, and a right frame; a single electrode tab is provided at the left end of the upper frame.

[0018] The frame is provided with multiple ribs, including multiple first ribs distributed laterally along the electrode surface and multiple second ribs distributed longitudinally along the electrode surface;

[0019] Along the vertical direction away from the top border, the spacing of the first rib decreases sequentially;

[0020] Along the lateral direction away from the monopole ear, the spacing of the second ribs decreases sequentially.

[0021] In one possible design, the second rib located on the vertical line of the top border is rectangular, and the shape of the remaining second ribs is such that the width of the second ribs gradually decreases along the direction away from the top border.

[0022] In one possible design, the second rib is trapezoidal in shape.

[0023] In one possible design, the first ribs are distributed such that, along the direction away from the top frame, the distance between two adjacent first ribs is not exactly the same.

[0024] In one possible design, the difference between the upper and lower side lengths of the second rib is 0.6–1.5 mm.

[0025] The distance between two adjacent first reinforcing bars is 2–10 mm;

[0026] Along the direction away from the top edge, the width of the first rib in the upper part is the same, and the width of the first rib in the lower part is the same. The width of the first rib in the upper part is greater than the width of the first rib in the lower part. The number of the first ribs in the upper part accounts for 1 / 4 to 1 / 2 of the total number of the first ribs.

[0027] In one possible design, the thickness of the first tab and the second tab is less than the thickness of the frame.

[0028] On the other hand, the present invention also provides a lead-acid battery that adopts the above-mentioned wide plate structure.

[0029] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0030] (1) This invention proposes a wide plate structure with a plate width A to plate height B ratio ranging from 1:1 to 2:1. By designing the plate width-to-height ratio (the ratio of ordinary plates is between 0.4 and 0.5), electrolyte stratification is reduced, the current density of the plate is evenly distributed, and the active material reaction is more uniform. During the cycle use of lead-acid batteries, the active material reaction products (lead sulfate) in the plates have good uniformity and less irreversible residue, resulting in a long cycle life of lead-acid batteries.

[0031] (2) This invention redesigns the battery structure to adapt to the new national standard's restrictions on vehicle weight. It employs wide plates to balance the utilization rate of the upper and lower plates, thereby reducing material usage and weight. Simultaneously, the design prioritizes both battery performance and lifespan, ensuring both initial capacity and cycle life. In particular, the aspect ratio of the battery plates needs optimization and improvement, making this a key influencing factor in the design.

[0032] (3) This invention improves the uniformity of electrochemical reaction intensity in various parts of the lead-acid battery under charging and discharging conditions by designing the aspect ratio of the lead-acid battery plates, thereby improving the overall performance of the lead-acid battery, such as specific energy, specific power and cycle life.

[0033] (4) The wide electrode structure of the present invention can adopt double tabs or single tabs. The second rib on the vertical line of the upper frame of the electrode plate with double tabs is designed as a rectangle to serve as a reinforcing rib and improve the creep resistance of the middle part of the electrode plate. The remaining second ribs are thicker at the top and thinner at the bottom, which is beneficial to the corrosion resistance and current collection of the upper part.

[0034] (5) The first rib of the bipolar tab plate of the present invention is V-shaped, which can improve the creep resistance of the plate; the distribution of the first rib is sparse at the top and dense at the bottom, which is conducive to improving the utilization rate of the active material at the bottom of the plate; the upper part of the first rib is thicker and the lower part of the first rib is thinner, which can reduce the cost while reducing the corrosion of the rib.

[0035] (6) The lead-acid battery provided by this invention adopts a wide plate structure with double tabs. The first and second tabs are symmetrically located on the left and right sides of the upper frame, resulting in uniform current distribution across the entire plate surface and reduced potential loss. This reduces heat generation during high-current charging and discharging, which is beneficial for high-power operation and extends battery life.

[0036] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained through the embodiments described and the accompanying drawings, which are particularly pointed out. Attached Figure Description

[0037] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0038] Figure 1 This is a schematic diagram of the structure of the wide electrode plate provided in Example 1;

[0039] Figure 2 This is a schematic diagram illustrating the effect of aspect ratio on the lead dioxide content after positive electrode plate formation, provided in Example 3.

[0040] Figure 3 This is a schematic diagram illustrating the effect of aspect ratio on the formation of lead sulfate as the negative electrode, provided in Example 3.

[0041] Figure 4 A schematic diagram showing the effect of aspect ratio on lead sulfate distribution on the negative electrode after three cyclic charging cycles, as provided in Example 3;

[0042] Figure 5 A schematic diagram illustrating the effect of aspect ratio on lead sulfate distribution on the negative electrode after 50 charge cycles, as provided in Example 3.

[0043] Figure 6 A schematic diagram showing the effect of aspect ratio on lead sulfate distribution on the negative electrode after 100 charging cycles provided in Example 3;

[0044] Figure 7 A schematic diagram showing the effect of aspect ratio on lead sulfate distribution on the negative electrode after 200 charging cycles, as provided in Example 3.

[0045] Figure 8 This is a schematic diagram of the bipolar tab plate in Example 4;

[0046] Figure 9 This is a schematic diagram of the structure of the monopole plate in Example 5;

[0047] Figure 10a This is a schematic diagram of the bipolar tab plate in Example 6;

[0048] Figure 10b This is a schematic diagram of another bipolar tab plate in Example 6;

[0049] Figure 11a This is a schematic diagram of the structure of the battery in Example 7;

[0050] Figure 11b This is a schematic diagram of the structure of the battery in Example 7;

[0051] Figure 12 This is a schematic diagram of the structure of the battery in Example 7;

[0052] Figure 13 This is a schematic diagram of the structure of the battery in Example 7;

[0053] Figure 14a This is a schematic diagram of the structure of the battery in Example 8;

[0054] Figure 14b This is a schematic diagram of the structure of the battery in Example 8;

[0055] Figure 15 This is a schematic diagram of the structure of the battery in Example 8;

[0056] Figure 16a This is a schematic diagram of the structure of the battery in Example 8;

[0057] Figure 16b This is a schematic diagram of the structure of the battery in Example 8;

[0058] Figure 17 Internal view of a 1×6 structure battery fabricated using a traditional single-tab electrode plate.

[0059] Figure label:

[0060] 1-Frame, 2-Single tab, 31-First tab, 32-Second tab, 4-Rib, 41-First rib, 42-Second rib, 5-Positive busbar, 6-Positive terminal, 7-Negative busbar, 8-Negative terminal. Detailed Implementation

[0061] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0062] Example 1

[0063] This invention provides a wide electrode structure, such as Figure 1 As shown, the ratio of the electrode width A to the electrode height B in the wide electrode structure ranges from 1:1 to 2:1.

[0064] Existing lead-acid batteries have a narrow-height plate structure, meaning a small width-to-height ratio, which leads to the following performance problems: (1) When the width-to-height ratio of the plates is small, the reaction on the plates is uneven during charging and discharging, meaning the reaction is more intense at the top of the plates and slower at the bottom. The utilization rate of active materials in the upper part is high, while the utilization rate of active materials in the lower part is low; (2) When the width-to-height ratio of the plates is too large, the reaction on the plates is uneven during charging and discharging, meaning the reaction is slower at the top of the plates and more intense at the bottom. The utilization rate of active materials in the upper part is low, while the utilization rate of active materials in the lower part is slightly higher.

[0065] Compared with the prior art, the present invention improves the existing narrow and tall electrode structure. Specifically, the electrode width A of the wide electrode is greater than or equal to the electrode height B. When the ratio of the electrode width A to the electrode height is controlled within the range of 1:1 to 2:1, the reaction on the electrode is more uniform during charging and discharging, and the utilization rate of the active material in the upper part and the lower part of the electrode structure is close.

[0066] In order to reduce corrosion and creep deformation of the electrode structure and ensure that the active material on the electrode reacts more uniformly, the electrode width A of the wide electrode structure of the present invention is greater than the electrode height B.

[0067] Specifically, the wide electrode structure used in this invention is cuboid in shape. The purpose of setting the electrode width A to be greater than the electrode height B is to reduce the corrosion and creep deformation of the electrode structure and ensure that the active material on the electrode reacts more uniformly.

[0068] In existing technologies, the narrow electrode plates used have relatively high local utilization rates of active materials, but these high-utilization portions are prone to detachment, leading to battery failure. This invention, however, sets the electrode width A to be greater than the electrode height B, resulting in similar utilization rates of active materials in the upper and lower parts of the electrode structure. Furthermore, it is important to emphasize that the wide electrode plate structure provided by this invention can suppress electrolyte stratification. This is because in existing narrow-height electrode plate structures, due to the higher density of sulfuric acid and water in the electrolyte, sulfuric acid tends to settle over time, leading to electrolyte stratification. This stratification results in uneven current distribution, accelerating electrode corrosion and creep. In contrast, the wide electrode plate structure provided by this invention, with its length greater than its width, prevents sulfuric acid and water in the electrolyte from stratifying, resulting in uniform active material utilization, uniform current distribution, and reduced electrode corrosion and creep.

[0069] The wide electrode plate of this embodiment includes a frame 1, which includes an upper frame 1, a lower frame 1, a left frame 1, and a right frame 1 connected together; a single electrode ear 2 is provided at the left end of the upper frame 1; multiple ribs are provided inside the frame 1, which include multiple horizontally distributed first ribs 41 and multiple vertically distributed second ribs 42; the spacing of the first ribs 41 decreases sequentially in the direction away from the upper frame 1 (vertical direction); the spacing of the second ribs 42 decreases sequentially in the direction away from the single electrode ear 2 (lateral direction).

[0070] exist Figure 1 In the diagram, A represents the width of the wide electrode plate; B represents the height of the wide electrode plate; C represents the spacing of the upper first rib 41 of the wide electrode plate; D represents the spacing of the lower first rib 41 of the wide electrode plate; E represents the spacing of the second rib 42 (vertical rib) near the monopole 2; F represents the spacing of the middle first rib 41 (horizontal rib); and G represents the spacing of the second rib 42 away from the monopole 2. Where C ≥ D, E ≥ F ≥ G. Since the output current at the monopole 2 has an approximately fan-shaped distribution of active material utilization with the monopole 2 as the center, and the current density is similarly distributed, the active material utilization and current density can be balanced by adjusting the physical spacing.

[0071] Example 2

[0072] This embodiment provides a wide electrode plate with an alternative structure. The difference between this wide electrode plate and the wide electrode plate in Embodiment 1 lies in the arrangement of the ribs and the location and number of the electrode tabs.

[0073] To improve the creep resistance of the long and wide electrode plate, this embodiment provides a wide electrode plate, such as... Figure 8As shown, the wide electrode plate includes a frame 1 and electrode ears. The frame 1 includes an upper frame, a lower frame, a left frame, and a right frame. The electrode ears include a first electrode ear 31 and a second electrode ear 32. Along the length of the upper frame of the wide electrode plate, the first electrode ear 31 and the second electrode ear 32 are symmetrically arranged on the upper frame, and the planes containing the first electrode ear 31 and the second electrode ear 32 are parallel to the electrode plate surface. Multiple horizontal and vertical intersecting ribs 4 are provided inside the frame 1. The ribs 4 include multiple first ribs 41 distributed horizontally along the electrode plate surface and multiple second ribs 42 distributed vertically along the electrode plate surface. Each first rib 41 is V-shaped, with its opening facing the upper frame. The first electrode ear 31 and the second electrode ear 32 have the same size. The relationship between the distance d between the first electrode ear 31 and the second electrode ear 32 (d refers to the distance between the two closest sides of the first electrode ear 31 and the second electrode ear 32) and the width w of the first electrode ear 31 and the length L of the upper frame is as follows: L≥d+2w.

[0074] Compared with the prior art, the wide electrode plate provided in this embodiment has double tabs. By optimizing the tab structure, the tabs of the double-tab electrode plate are symmetrically located on the left and right sides of the upper frame, resulting in uniform current distribution across the entire electrode plate surface and reduced potential loss. During high-current charging and discharging, it can reduce the generation of battery heat, which is beneficial for high-power operation of the battery and extends the battery's service life. Furthermore, the first rib is V-shaped, which can improve the electrode plate's creep resistance.

[0075] Specifically, the length of the upper frame is L, and the distance between the first tab 31 and the second tab 32 is d. Considering that if d is too small, the first tab 31 and the second tab 32 will almost overlap; if d is too large, it will be unfavorable for manufacturing. Therefore, L ≥ d + 2w ≥ 5mm is controlled. For example, L = d + 2w.

[0076] Specifically, in this wide electrode plate, the second rib 42 located on the vertical center line of the upper frame is rectangular, serving as a reinforcing rib and improving the creep resistance of the middle part of the wide electrode plate (once the electrode plate creeps, it will push against the busbar, causing a short circuit failure). The shape of the remaining second ribs 42 is such that the width of the second ribs 42 gradually decreases along the direction away from the upper frame, that is, it is thicker at the top and gradually tapers towards the bottom. For example, the shape of the second rib 42 is trapezoidal, with the side length near the upper frame being longer than the side length away from the electrode tab. The top-thinning design of the second ribs 42 is beneficial to the corrosion resistance and current collection function of the upper part.

[0077] It should be noted that the difference between the upper and lower side lengths of the second rib 42 in this embodiment is 0.6 to 1.5 mm.

[0078] Specifically, in the wide electrode plate, each first rib 41 is V-shaped with its opening facing the upper frame. The V-shape of the first rib 41 can improve the electrode plate's creep resistance. For example, the included angle of the V-shape is greater than 90° and less than 180°.

[0079] Specifically, the distribution of the first rib 41: along the direction away from the upper frame, the distance between two adjacent first ribs 41 is not exactly the same.

[0080] Specifically, the distribution of the first ribs in the long and wide electrode plate provided in this embodiment is as follows: along the direction away from the upper frame, the spacing between the ribs gradually decreases from top to bottom, that is, the distribution of the first ribs 41 is sparse at the top and dense at the bottom. In other words, along the direction away from the upper frame, the distance between two adjacent first ribs 41 gradually decreases. This arrangement is beneficial to improving the utilization rate of the active material at the bottom of the electrode plate.

[0081] Specifically, the distance between two adjacent first reinforcing bars 41 is 2 to 10 mm.

[0082] Considering that the reaction at the upper part of the electrode plate is more intense and the corrosion of the ribs is more severe, in order to reduce the corrosion of the ribs and reduce costs, it is preferable that the width of the first rib 41 in the bipolar tab electrode plate is not completely the same.

[0083] It should be noted that, along the direction away from the top edge, the width of the first rib in the upper part is the same, and the width of the first rib in the lower part is the same, with the width of the first rib in the upper part being greater than that in the lower part; for example, the number of the first ribs in the upper part accounts for 1 / 4 to 1 / 2 of the total number of the first ribs.

[0084] To improve the utilization rate of the active material at the bottom of the wide electrode plate, the distribution of the first rib in this invention is such that the width of the first rib gradually decreases along the direction away from the upper frame.

[0085] Specifically, in the bipolar plate, the first tab 31 and the second tab 32 are the same size. Specifically, the size of the first tab 31 and the second tab 32 is designed according to the specific battery model. For example, the size of the first tab 31 and the second tab 32 is 3-10mm wide and 3-10mm high.

[0086] Specifically, the thickness of the first tab 31 and the second tab 32 is slightly less than the thickness of the frame 1, and the difference between the thickness of the frame 1 and the thickness of the first tab 31 and the second tab 32 is 0.5 to 3 mm.

[0087] It should be noted that the bipolar plates used in lead-acid batteries can also be used as plates in power batteries. Power batteries typically discharge at a rate of around 0.5C and are charged at around 0.25C. At this rate, the interaction between the positive and negative plates due to ion migration is significant, requiring specific design for the tabs and rib arrangement.

[0088] The power battery for which the electrode plate of the present invention is applicable is different from that of automobile starting battery. Automobile starting battery requires instantaneous high current output capability. Therefore, in terms of the distribution of ribs on the positive electrode plate, the main design principle is to minimize the internal resistance of the ribs. Generally, a radial rib distribution is adopted. Since the discharge time is extremely short, the interaction between the positive and negative electrodes during the discharge process through ion migration can be small. Therefore, the relative position of the positive and negative electrode tabs has little impact.

[0089] The power battery of this invention differs from gel energy storage batteries. Gel energy storage batteries generally use low-rate discharge of less than 10 hours, and the ion migration rate has little impact on the interaction between the positive and negative electrodes. Therefore, the relative positions of the positive and negative electrodes are less affected.

[0090] Example 3

[0091] This embodiment provides a lead-acid battery, which is made using the wide plate structure provided in Embodiment 1.

[0092] To conduct 3, 50, 100, and 200 charge-discharge cycles on lead-acid batteries made with electrode plates of different aspect ratios in this embodiment, the lead sulfate content in the active material of the negative electrode plate after charging was measured in parallel under charging and discharging conditions. This was done to calculate the intensity difference of the electrode plate reaction and its impact on the reversibility of the active material. Voltage drop at different positions on the electrode plate was measured, internal resistance at different positions was analyzed, current distribution was calculated, and reaction activity was calculated. (See [link to relevant documentation]). Figures 2 to 7 The test data are shown in Tables 1 and 2. This embodiment ultimately verifies that the width / height ratio of the optimized wide plate structure for lead-acid batteries is 1:1-2:1.

[0093] exist Figures 2 to 7 In the diagram, the horizontal axis represents the aspect ratio, and the vertical axis represents the percentage; the upper, middle, and lower refer to the upper, middle, and lower parts of the electrode plate, respectively; the range refers to the maximum difference between the upper, middle, and lower parts.

[0094] Figure 2 This indicates that changing the aspect ratio has no significant effect on the lead dioxide content after formation (i.e., the formation effect), and the top, middle and bottom parts are more uniform. Figures 3 to 7 This indicates that as the number of cycles increases, less and more uniform lead sulfate (sulfation) is generated after charging when the aspect ratio is in the range of 1:1 to 2:1, which is beneficial to the life of lead-acid batteries.

[0095] This embodiment conducts comparative optimization tests on electrode plates with different width / height ratios, as shown in Tables 1 and 2:

[0096] Table 1. Optimized test data for wide plates with different width / height ratios.

[0097]

[0098]

[0099] Table 2 Optimized test data for wide-type electrode plates with different width / height ratios

[0100]

[0101]

[0102] This invention involves charging and forming batteries with plates of different aspect ratios. This process converts the active material of the positive electrode into lead dioxide and the active material of the negative electrode into spongy lead. By measuring the content of charging and discharging products in the active material of different parts of the plates after formation, the optimal aspect ratio for consistent formation reaction is determined. The optimal value is 1:1-1:2. A lead dioxide content of around 90% is preferred for the positive plate, while the lead sulfate content in the negative electrode should be as low and uniform as possible.

[0103] Example 4

[0104] This embodiment provides a specific wide-type electrode plate, employing, as shown in... Figure 8 As shown, the wide electrode plate includes a frame 1 and electrode ears. The frame 1 includes an upper frame, a lower frame, a left frame, and a right frame. The electrode ears include a first electrode ear 31 and a second electrode ear 32. Along the length of the upper frame of the electrode plate, the first electrode ear 31 and the second electrode ear 32 are symmetrically arranged on the upper frame, and the planes containing the first electrode ear 31 and the second electrode ear 32 are parallel to the electrode plate surface. Ribs 4 are provided inside the frame 1. The ribs 4 include multiple first ribs 41 distributed laterally along the electrode plate surface and multiple second ribs 42 distributed longitudinally along the electrode plate surface. Each first rib 41 is V-shaped, with its opening facing the upper frame, and the included angle of the V-shape is 150°. The first electrode ear 31 and the second electrode ear 32 have the same dimensions. The relationship between the distance d between the first electrode ear 31 and the second electrode ear 32 and the width w of the first electrode ear 31 and the length L of the upper frame is as follows: L = d + 2w.

[0105] Specifically, w is 3mm, L is 66mm, and d is 60mm.

[0106] The second rib 42 located on the vertical line of the upper frame is rectangular, and the remaining second ribs 42 are trapezoidal in shape, thicker at the top and thinner at the bottom; the distribution of the first ribs 41 is sparse at the top and dense at the bottom, the width of the first ribs in the upper part is the same, the width of the first ribs in the lower part is the same, and the width of the first ribs in the upper part is greater than that of the first ribs in the lower part; the number of the first ribs in the upper part accounts for 5 / 13 of the total number of the first ribs.

[0107] The difference between the thickness of the frame 1 and the thickness of the first tab 31 is 1mm.

[0108] Example 5

[0109] This embodiment provides a wide electrode plate, such as Figure 9 As shown, the wide electrode plate includes a frame 1 and an electrode tab. The frame 1 includes an upper frame, a lower frame, a left frame, and a right frame. There is one electrode tab, referred to as a single electrode tab 2, located in the middle of the upper frame. The plane of the single electrode tab 2 is parallel to the surface of the electrode plate. The single electrode tab 2 is 5mm wide and 10mm high. The thickness of the single electrode tab 2 is slightly less than the thickness of the frame 1, with a difference of 1mm between the thicknesses of the frame 1 and the single electrode tab 2. The interior of the frame 1 has multiple horizontally and vertically intersecting ribs 4. The ribs 4 include multiple first ribs 41 distributed horizontally along the electrode plate direction and multiple second ribs 42 distributed vertically along the electrode plate direction. The first ribs 41 and the second ribs 42 intersect perpendicularly.

[0110] Example 6

[0111] This embodiment provides a wide electrode plate for lead-acid batteries, such as... Figure 10a As shown, the wide electrode plate includes a frame 1 and electrode tabs. The frame 1 includes an upper frame, a lower frame, a left frame, and a right frame. The electrode tabs include a first electrode tab 31 and a second electrode tab 32. Along the length of the upper frame of the electrode plate, the first electrode tab 31 and the second electrode tab 32 are symmetrically arranged on the upper frame, and the planes containing the first electrode tab 31 and the second electrode tab 32 are parallel to the electrode plate surface. The first electrode tab 31 and the second electrode tab 32 have the same dimensions, and the width of both the first electrode tab 31 and the second electrode tab 32 is 3mm. The distance between the first electrode tab 31 and the second electrode tab 32 is 7mm. The interior of the frame 1 is provided with multiple horizontally and vertically intersecting ribs 4. The ribs 4 include multiple first ribs 41 distributed horizontally along the electrode plate direction and multiple second ribs 42 distributed vertically along the electrode plate direction. The first ribs 41 and the second ribs 42 intersect perpendicularly.

[0112] In one possible design, such as Figure 10b As shown, the distance between the first tab 31 and the second tab 32 is d1, the width of the first tab 31 is w1, and the length of the frame 1 is L1, where L1 = d1 + 2w1. For example, w1 is 3mm, L1 is 66mm, and d1 is 60mm.

[0113] Example 7

[0114] This embodiment provides a lead-acid battery, including a single cell, such as... Figure 11a As shown, a single cell battery includes multiple positive and negative plates arranged in alternating layers. The negative plate of the lead-acid battery adopts the design of Example 6. Figure 10b The lead-acid battery uses the plate structure of Example 5 for its positive plate. In this example, a single cell consists of 4 positive plates and 5 negative plates connected in parallel. The tabs are the connection points of these plates. The top of the tab on the positive plate is the positive busbar 5, and the top of the tab on the negative plate is the negative busbar 7. The busbars then connect the tabs of each plate in the single cell together in parallel. The configuration can be 4 positive plates and 5 negative plates, or 5 positive plates and 6 negative plates, depending on the battery capacity and model.

[0115] In this embodiment, a 12V lead-acid battery is used. Therefore, the above-mentioned six individual cells are connected in series to form a 12V lead-acid battery. The tabs of each positive plate are connected to the positive terminal 6 via the positive bus 5, and the tabs of each negative plate are connected to the negative terminal 8 via the negative bus 7. The six individual cells can be connected in series in a 1×6 structure. Figure 11a (marked as 4-1#), 2×3 structure ( Figure 12 (marked as 4-2#) or 3×2 structure ( Figure 13 (marked as 4-3#).

[0116] It should be noted that, as Figure 11b As shown, in this embodiment, the positive plate of the lead-acid battery can also adopt the plate structure of Embodiment 6, and the negative plate of the lead-acid battery can adopt the plate structure of Embodiment 5. The six individual cells can be connected in series in a 1×6 structure. Figure 11b , marked as 4-4#, 2×3 structure (marked as 4-5#) or 3×2 structure (marked as 4-6#).

[0117] Example 8

[0118] This embodiment provides a lead-acid battery, including a single cell, such as... Figure 14a , 14b As shown, a single-cell battery includes multiple positive and negative plates stacked alternately, with the negative plate employing the method described in Example 6. Figure 10b The electrode structure, the positive electrode adopts the method of Example 6 Figure 10a The electrode structure in this embodiment is composed of 4 positive electrode plates and 5 negative electrode plates connected in parallel. The top of the tab of the positive electrode plate is the positive electrode busbar 5, and the top of the tab of the negative electrode plate is the negative electrode busbar 7. The tabs of each electrode plate in the single cell are connected in parallel through the busbars.

[0119] In this embodiment, a 12V lead-acid battery is used. Therefore, the above-mentioned six individual cells are connected in series to form a 12V lead-acid battery. The tabs of each positive plate are connected to the positive terminal 6 via the positive bus 5, and the tabs of each negative plate are connected to the negative terminal 8 via the negative bus 7. The six individual cells can be connected in series in a 1×6 structure. Figure 14a (marked as 5-1#), 2×3 structure (marked as 5-2#), or 3×2 structure ( Figure 16a (marked as 5-3#).

[0120] It should be noted that in this embodiment, the positive electrode plate of a single cell may adopt the electrode plate structure of Embodiment 3, and the negative electrode plate of a single cell may adopt the electrode plate structure of Embodiment 2. The six single cells can be connected in series in a 1×6 structure. Figure 14b (marked as 5-4#), 2×3 structure ( Figure 15 (marked as 5-5#) or 3×2 structure ( Figure 16b (marked as 5-6#).

[0121] Example 9

[0122] This embodiment provides a lead-acid battery, including a single cell. Each cell comprises multiple alternating positive and negative plates. The positive plate of the single cell uses the plate structure of Embodiment 4, and the negative plate uses the plate structure of Embodiment 2. It should be noted that the lead-acid battery may include six single cells, which can be connected in series in a 1×6 structure (labeled 6-1#), a 2×3 structure, or a 3×2 structure.

[0123] In this embodiment, the design of the ribs and shape of the negative electrode plate can be the same as that of the positive electrode plate.

[0124] Example 10

[0125] This embodiment provides a lead-acid battery, including a single cell. Each cell comprises multiple alternating positive and negative plates. The positive plate of the single cell adopts the plate structure of Embodiment 1, and the negative plate adopts the plate structure of Embodiment 3. It should be noted that the lead-acid battery may include six single cells, and the six single cells can be connected in series in a 1×6 structure (labeled 7-1#), a 2×3 structure, or a 3×2 structure.

[0126] In this embodiment, the design of the ribs and shape of the negative electrode plate can be the same as that of the positive electrode plate.

[0127] Figure 10 shows a 1×6 battery prepared using a conventional monopole plate.

[0128] The performance data of the batteries prepared by conventional single-tab plates, the 4-4# battery of Example 7, the 6-1# battery of Example 9, the 5-4# battery of Example 8, and the 7-1# battery of Example 10 are listed in Table 1 below. The performance of the 6-1# battery is better than that of the 4-4# battery, and the performance of the 7-1# battery is better than that of the 5-4# battery.

[0129] It is evident that optimizing the shape and position distribution of the ribs on the positive electrode plate in this invention can further improve battery performance. In this invention, the second rib on the vertical line of the upper frame of the bipolar electrode plate for lead-acid batteries is rectangular, serving as a reinforcing rib and improving the creep resistance of the middle part of the electrode plate; the remaining second ribs are thicker at the top and thinner at the bottom, which is beneficial for corrosion resistance and current collection in the upper part. In this invention, the first rib of the bipolar electrode plate is V-shaped, which improves the creep resistance of the electrode plate; the distribution of the first ribs is sparse at the top and dense at the bottom, which is beneficial for improving the utilization rate of the active material at the bottom of the electrode plate; the thicker upper part of the first rib and the thinner lower part of the first rib can reduce costs while minimizing rib corrosion.

[0130] Table 1 Performance data of different batteries

[0131]

[0132]

[0133] Note: The improvements in active material utilization and power characteristics mentioned in the table refer to the comparison with batteries made using traditional single-tab plates.

[0134] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A wide-plate structure for use as a power battery in a lead-acid battery, characterized in that, The ratio of the electrode width A to the electrode height B is in the range of 1:1 to 2:1; The wide electrode structure employs bipolar lugs; The wide electrode plate includes a frame, which includes an upper frame, a lower frame, a left frame, and a right frame; The frame is provided with multiple ribs, including multiple first ribs distributed laterally along the electrode plate surface and multiple second ribs distributed longitudinally along the electrode plate surface. Each first rib is V-shaped with its opening facing the upper frame. The included angle of the V-shape is 90°-180°; The wide electrode plate also includes electrode tabs; The electrode tab includes a first electrode tab and a second electrode tab, which are symmetrically arranged on the upper frame along the length of the upper frame; the plane containing the first electrode tab and the second electrode tab is parallel to the electrode plate surface. The first electrode and the second electrode have the same size. The relationship between the distance d between the first electrode and the second electrode and the width w of the first electrode and the length L of the upper frame is as follows: L≥d+2w≥5mm; The second rib located on the vertical line of the upper frame is rectangular, and the shape of the remaining second ribs is such that the width of the second rib gradually decreases along the direction away from the upper frame; the difference between the length of the upper side and the length of the lower side of the second rib is 0.6~1.5mm. The distribution of the first ribs is such that, along the direction away from the top frame, the distance between two adjacent first ribs is not exactly the same; The distance between two adjacent first reinforcing bars gradually decreases; The widths of the first ribs are not all the same; Along the direction away from the top edge, the width of the first rib in the upper part is the same, the width of the first rib in the lower part is the same, and the width of the first rib in the upper part is greater than the width of the first rib in the lower part. The thickness of the first and second tabs is less than the thickness of the frame, and the difference between the thickness of the frame and the thickness of the first and second tabs is 0.5~3mm.

2. The wide plate structure for lead-acid batteries used as power batteries according to claim 1, characterized in that, The wide electrode plate has a cuboid shape; the width A of the wide electrode plate is greater than the height B of the electrode plate.

3. The wide-plate structure for lead-acid batteries used as power batteries according to claim 2, characterized in that, The second rib is trapezoidal in shape.

4. The wide plate structure for lead-acid batteries used as power batteries according to claim 3, characterized in that, The distance between two adjacent first reinforcing bars is 2~10mm; The number of first ribs in the upper part accounts for 1 / 4 to 1 / 2 of the total number of first ribs.

5. A lead-acid battery used as a power battery, characterized in that, The wide electrode structure described in any one of claims 1 to 4 is adopted.

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