Single-pole tab-plate grid structure storage battery

Abstract

The application relates to a single bipolar lug plate grid structure storage battery and belongs to the technical field of lead storage batteries, which is used to solve the problems of uneven current distribution in the internal plate of the existing lead storage battery and short cycle life of the battery. The storage battery comprises a single cell, the single cell comprises a plurality of positive plates and a plurality of negative plates which are alternately and laminatedly arranged; each positive plate and each negative plate comprises a frame and a lug, the frame comprises an upper frame, a lower frame, a left frame and a right frame; the lug of each positive plate comprises a first lug and a second lug, the first lug and the second lug are symmetrically arranged on the upper frame; the number of the lug of each negative plate is one, and the single lug is located at the middle position of the upper frame of the negative plate; the relationship between the distance d between the first lug and the second lug and the width w of the single lug and the length L1 of the upper frame is as follows: L1 >= d > w; in the positive plate, the rib comprises a first rib and a second rib, and the shape of the first rib is V-shaped. The battery has a long service life.

Description

Technical Field

[0001] This invention relates to the field of lead-acid batteries, and more particularly to a single- and double-lever grid structure battery. Background Technology

[0002] Lead-acid batteries have been around for over a century and are one of the most widely used chemical power sources globally. Their raw materials are abundant, inexpensive, and recyclable. A battery mainly consists of positive and negative plates, separators, a battery casing, and other components. The plates primarily consist of grids and active material. Grid design, besides requiring ease of forging, must also ensure good contact and mechanical properties between the grid surface and the active material, while simultaneously achieving uniform current distribution and minimal ohmic voltage drop across the entire plate. Currently, most batteries on the market use single-tab grids, with the positive and negative tabs on one side of the grid. This design leads to uneven utilization of the active material on the upper and lower parts of the plates, resulting in electrolyte concentration differences and severely impacting battery life. During high-current charging and discharging, the internal resistance increases dramatically, potentially causing thermal runaway and damaging the battery. Summary of the Invention

[0003] In view of the above analysis, the present invention aims to provide a single- and double-tab grid structure battery that can solve at least one of the following problems: (1) the current distribution inside the plates of existing lead-acid batteries is uneven, the ohmic voltage drop is large, and the cycle life of the battery is short; (2) the cost of the battery is high; (3) the battery is complicated to manufacture.

[0004] On one hand, the present invention provides a single- and double-tab grid structure battery, the single- and double-tab grid structure battery comprising a single cell, the single cell comprising a plurality of positive plates and a plurality of negative plates alternately stacked; each of the positive plates and each of the negative plates comprises a frame and tabs, the frame comprising an upper frame, a lower frame, a left frame and a right frame;

[0005] Each of the positive electrode plates includes a first electrode and a second electrode. Along the length of the upper frame, the first electrode and the second electrode are symmetrically arranged on the upper frame. The plane containing the first electrode and the second electrode is parallel to the electrode surface of the positive electrode plate. The first electrode and the second electrode have the same size.

[0006] Each negative electrode plate has one tab, referred to as a single tab. The single tab is located in the middle of the upper frame of the negative electrode plate, and the plane of the single tab is parallel to the electrode plate surface of the negative electrode plate.

[0007] The relationship between the distance d between the first electrode and the second electrode, the width w of the single electrode, and the length L1 of the upper frame is as follows: L1≥d>w;

[0008] Ribs are provided inside the frames of both the positive and negative electrode plates;

[0009] In the positive electrode plate, the ribs include 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.

[0010] Furthermore, in the negative electrode plate, the ribs include multiple first ribs distributed laterally along the electrode plate surface and multiple second ribs distributed longitudinally along the electrode plate surface, wherein the first ribs and the second ribs intersect perpendicularly.

[0011] Furthermore, in the positive electrode plate, the second rib located on the vertical line of the upper frame of the positive electrode plate 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.

[0012] Furthermore, the remaining second ribs are trapezoidal in shape.

[0013] Furthermore, in the positive electrode plate, the first rib is distributed with sparser ribs at the top and denser ribs at the bottom.

[0014] Furthermore, in the positive electrode plate, the width of the first rib is not entirely the same.

[0015] Furthermore, in the positive electrode plate, the width of the upper first rib is greater than the width of the lower first rib.

[0016] Furthermore, the included angle of the V-shape is greater than 90° and less than 180°.

[0017] Furthermore, the thickness of the negative electrode plate is less than the thickness of the positive electrode plate.

[0018] Furthermore, the number of individual battery cells is one or more.

[0019] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0020] (1) The single and double tab plate grid structure battery of the present invention uses a single tab located in the middle of the upper frame of the negative plate, and two tabs of the positive plate are symmetrically located on the left and right sides of the upper frame of the positive plate. The current distribution of the entire plate surface is uniform, reducing potential loss. During high current charging and discharging, the heat generation of the battery can be reduced, which is conducive to the high power operation of the battery and extends the service life of the battery.

[0021] (2) Furthermore, by controlling the distance between the two tabs of the positive plate to be greater than the width of the single tab of the negative plate, it is not conducive to welding the busbar when the tabs of the positive and negative plates are too close. The single and double tab grid structure battery of the present invention has a simple manufacturing process and is suitable for large-scale industrial production.

[0022] (3) In the positive plate of the single and double tab plate grid structure battery of the present invention, the second rib on the vertical line of the upper frame is rectangular, which serves as a reinforcing rib and can improve the creep resistance of the middle part of the plate; the remaining second ribs are thicker at the top and thinner at the bottom, which can help the upper part resist corrosion and current collection.

[0023] (4) In the positive plate of the single and double tab grid structure battery of the present invention, the first rib is V-shaped, which can improve the creep resistance of the grid; 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.

[0024] (5) The thickness of the negative plate of the single and double tab grid structure battery of the present invention is less than the thickness of the positive plate, and the number of ribs of the negative plate is less than the number of ribs of the positive plate; it can reduce production costs while ensuring battery performance, and the economic benefits are significant.

[0025] 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 from what is particularly pointed out in the description and drawings. Attached Figure Description

[0026] 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.

[0027] Figure 1 This is a schematic diagram of the structure of the single-pole lug grid in Example 1;

[0028] Figure 2 This is a schematic diagram of the bipolar lug grid structure in Example 2;

[0029] Figure 3 This is a schematic diagram of the bipolar lug grid structure in Example 3;

[0030] Figure 4a This is a schematic diagram of the battery structure in Example 4;

[0031] Figure 4b This is a schematic diagram of the battery structure in Example 4;

[0032] Figure 5 This is a schematic diagram of the battery structure in Example 4;

[0033] Figure 6 This is a schematic diagram of the battery structure in Example 4;

[0034] Figure 7 Internal view of a 1×6 structure battery fabricated using a traditional single-tab electrode plate;

[0035] Figure 8 This is a schematic diagram illustrating the cycle performance of the battery.

[0036] Figure 9 This is a comparison diagram of the temperature distribution of batteries prepared according to embodiments of the present invention and those prepared using conventional single-tab plates.

[0037] Figure label:

[0038] 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

[0039] 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.

[0040] This invention provides a single- and double-tab grid structure battery, comprising a single cell, each cell including multiple positive plates and multiple negative plates alternately stacked; each positive plate and each negative plate includes a frame 1 and tabs, the frame 1 including an upper frame, a lower frame, a left frame, and a right frame; each positive plate includes a first tab 31 and a second tab 32, the first tab 31 and the second tab 32 being symmetrically arranged on the upper frame along its length; the first tab 31 and the second tab 32... The plane containing ear 32 is parallel to the plate surface of the positive electrode plate; each negative electrode plate has one ear, called a single ear 2, which is located in the middle of the upper frame of the negative electrode plate, and the plane containing single ear 2 is parallel to the plate surface of the negative electrode plate; the relationship between the distance d between the first ear 31 and the second ear 32 (d refers to the distance between the two closest sides of the first ear 31 and the second ear 32, and this distance is also referred to in the following text) and the width w of single ear 2 and the length L1 of the upper frame is as follows: L1≥d>w.

[0041] Compared with existing technologies, the single / double tab grid structure battery provided by this invention optimizes the tab structure. The single tab of the negative plate is located in the middle of the upper edge of the negative plate, while the two tabs of the positive plate are symmetrically located on the left and right sides of the upper edge of the positive plate. This results in uniform current distribution across the entire plate surface, reducing potential loss and minimizing heat generation during high-current charging and discharging, which is beneficial for high-power operation and extends battery life. Furthermore, by controlling the distance between the two tabs of the positive plate to be greater than the width of the single tab of the negative plate, the close proximity of the tabs on the positive and negative plates prevents difficulties in welding the busbars. The single / double tab grid structure battery of this invention has a simple manufacturing process and is suitable for large-scale industrial production.

[0042] Specifically, the thickness of the monopole 2, the first electrode 31, and the second electrode 32 is less than the thickness of the frame 1.

[0043] Specifically, the length of the upper frame is L1, 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, which is not conducive to manufacturing. Therefore, L1 ≥ d ≥ 5mm is controlled.

[0044] Specifically, multiple horizontal and vertical ribs 4 are provided inside the frame 1 of both the positive and negative plates. The ribs 4 are distributed inside the frame 1 in the following ways: horizontally along the direction of the plate, vertically along the direction of the plate, or at a certain angle (e.g., 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°) with the upper frame. The distribution of the ribs 4 is not limited to these and can be set according to the design requirements.

[0045] In one possible design, the rib 4 in the negative electrode plate includes multiple first ribs 41 distributed laterally along the electrode plate surface and multiple second ribs 42 distributed longitudinally along the electrode plate surface, with the first ribs 41 and the second ribs 42 intersecting perpendicularly.

[0046] Specifically, in the positive electrode plate, 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. The second ribs 42 located on the vertical line of the upper frame of the positive electrode plate are rectangular and serve as reinforcing ribs, improving the creep resistance of the middle part of the 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 thinner at the bottom. For example, the shape of the second ribs 42 is trapezoidal, with the side length near the upper frame being greater than the side length away from the electrode tab. The arrangement of the second ribs 42, which is thicker at the top and thinner at the bottom, is beneficial to the corrosion resistance and current collection function of the upper part.

[0047] Specifically, the difference between the upper and lower side lengths of the second rib 42 is 0.6 to 1.5 mm.

[0048] Preferably, in the positive 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 creep resistance of the grid. For example, the included angle of the V-shape is greater than 90° and less than 180°.

[0049] Specifically, in the positive electrode plate, the distribution of the first rib 41 is such that the distance between two adjacent first ribs 41 is not exactly the same along the direction away from the upper frame.

[0050] Preferably, in the positive electrode plate, the distribution of the first ribs 41 is such that, along the direction away from the upper frame, the spacing between them 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. For example, the distance between two adjacent first ribs 41 is 10-2 mm.

[0051] 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 positive electrode plate is not completely uniform.

[0052] In one possible design, along the direction away from the top edge, the width of the first ribs in the upper part is the same, and the width of the first ribs in the lower part is the same, with the width of the first ribs in the upper part being greater than the width of the first ribs 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.

[0053] In one possible design, the width of the first rib gradually decreases along the direction away from the top edge.

[0054] Specifically, in the negative electrode plate, the thickness of the single tab 2 is slightly less than the thickness of the upper frame 1 of the negative electrode plate. For example, the difference between the thickness of the upper frame 1 and the thickness of the single tab 2 is 0.5 to 3 mm. The width and height of the single tab 2 are designed according to the specific battery model. For example, the dimensions of the single tab 2 are 5 mm wide and 10 mm high.

[0055] Specifically, in the positive electrode plate, the first tab 31 and the second tab 32 are of the same size. The dimensions of the first tab 31 and the second tab 32 are designed according to the specific battery model; for example, the height of the first tab 31 and the second tab 32 is 10mm. Specifically, the thickness of the first tab 31 and the second tab 32 is slightly less than the thickness of the upper frame 1 of the positive electrode plate, and the difference between the thickness of the upper frame 1 of the positive electrode plate and the thickness of the first tab 31 and the second tab 32 is 0.5 to 3mm. For example, the dimensions of the first tab 31 and the second tab 32 are 5mm wide and 10mm high.

[0056] Specifically, considering the high utilization rate of the positive plate in lead-acid batteries, to reduce costs, the thickness of the negative plate can be less than that of the positive plate, and the number of ribs on the negative plate can be less than that on the positive plate. Specifically, considering that excessively thin negative plates cannot guarantee battery performance, the thickness of the negative plate is controlled to be 80%–95% of the thickness of the positive plate; the number of ribs on the negative plate is also controlled to be 80%–95% of the number of ribs on the positive plate. This configuration can reduce production costs while ensuring battery performance, resulting in significant economic benefits.

[0057] Specifically, in a single cell, the top of the first tab 31 of the positive plate is the first positive busbar, which connects multiple first tabs in parallel; the top of the second tab 32 is the second positive busbar, which connects multiple second tabs 32 in parallel; the top of the single tab 2 of the negative plate is the negative busbar, which connects multiple single tabs 2 of the negative plate in parallel; the first tab 31 of each positive plate is connected to the positive terminal through the first positive busbar, and the second tab 32 of each positive plate is connected to the positive terminal through the second positive busbar; the single tab 2 of each negative plate is connected to the negative terminal through the negative busbar.

[0058] Optionally, the structural relationship of the tabs of the positive and negative plates of the above-mentioned single cell can be interchanged.

[0059] Specifically, the aforementioned single- or double-lamp grid structure battery may include one or more individual cells. When the single- or double-lamp grid structure battery includes multiple individual cells, the multiple individual cells can be connected in series to obtain lead-acid batteries of different specifications.

[0060] Specifically, the nominal voltage of the aforementioned single-cell battery is 2.0V, it can discharge to 1.7V, and it can charge to 2.5V. In applications, six single-cell batteries can be connected in series to form a lead-acid battery with a nominal voltage of 12V. Multiple single-cell batteries can also be connected in series to form lead-acid batteries with nominal voltages of 24V, 36V, 48V, etc.

[0061] Specifically, the above six individual battery cells can be connected in series in a 1×6, 2×3, or 3×2 structure.

[0062] It should be noted that the aforementioned single / double tab grid structure battery can be used as a power battery. Power batteries typically discharge at a rate of around 0.5C and are charged at around 0.25C. At this rate, the interaction between ion migration and the positive and negative plates is significant, requiring specific design for the tabs and rib arrangement.

[0063] The power battery of this invention differs from that of a car starting battery. Car starting batteries require instantaneous high current output capability. Therefore, in terms of the distribution of ribs on the positive 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 a small impact.

[0064] 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.

[0065] Compared with the prior art, the single and double tab grid structure battery of the present invention uses a single tab located in the middle of the upper frame of the negative plate, and two tabs of the positive plate symmetrically located on the left and right sides of the upper frame of the positive plate. The current distribution of the entire plate surface is uniform, reducing potential loss. During high current charging and discharging, it can reduce the generation of battery heat, which is conducive to high power operation of the battery and extends the battery life.

[0066] Furthermore, by controlling the distance between the two tabs of the positive plate to be greater than the width of the single tab of the negative plate, the welding of the busbar is prevented when the tabs of the positive and negative plates are too close. The single and double tab grid structure battery of the present invention has a simple manufacturing process and is suitable for large-scale industrial production.

[0067] In the single and double tab grid structure battery of the present invention, the second rib on the vertical line of the upper frame of the positive plate is rectangular, which serves as a reinforcing rib and can improve the creep resistance of the middle part of the plate; the remaining second ribs are thicker at the top and thinner at the bottom, which can help the upper part resist corrosion and the current collection function.

[0068] In the positive plate of the single / double tab grid structure battery of the present invention, the first rib is V-shaped, which can improve the creep resistance of the grid; the distribution of the first rib is sparse at the top and dense at the bottom, which is beneficial 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.

[0069] The negative plate of the single / double tab grid structure battery of the present invention has a thickness less than that of the positive plate, and the number of ribs on the negative plate is less than that on the positive plate; it can reduce production costs while ensuring battery performance, resulting in significant economic benefits.

[0070] Example 1

[0071] This embodiment provides a grid for a single / double tab battery (hereinafter referred to as grid), such as Figure 1 As shown, the grid includes a frame 1 and a tab. The frame 1 includes a top frame, a bottom frame, a left frame, and a right frame. There is one tab, referred to as a single tab 2, which is located in the middle of the top frame. The plane of the single tab 2 is parallel to the grid surface. The single tab 2 is 5mm wide and 10mm high. The thickness of the single tab 2 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 single tab 2 is 1mm.

[0072] The interior of the frame 1 is provided with multiple horizontal and vertical intersecting ribs 4. The ribs 4 include multiple first ribs 41 distributed horizontally along the direction of the electrode plate and multiple second ribs 42 distributed vertically along the direction of the electrode plate. The first ribs 41 and the second ribs 42 intersect perpendicularly.

[0073] Example 2

[0074] This embodiment provides a grid for a single / double tab battery (hereinafter referred to as grid), such as Figure 2 As shown, the grid includes a frame 1 and electrode tabs. The frame 1 includes a top frame, a bottom frame, a left frame, and a right frame. There are two electrode tabs, including a first electrode tab 31 and a second electrode tab 32, which are the same size. Along the length of the top frame of the grid, the first electrode tab 31 and the second electrode tab 32 are symmetrically arranged on the outer side of the top frame, and the plane containing the first electrode tab 31 and the second electrode tab 32 is parallel to the grid surface. The distance between the first electrode tab 31 and the second electrode tab 32 is d, the width of the first electrode tab 31 is w1, and the length of the frame 1 is L1, where L1 = d + 2w1. For example, w1 is 3mm, L1 is 66mm, and d is 60mm.

[0075] Specifically, multiple ribs 4 are provided within the frame 1. The ribs 4 include multiple first ribs 41 distributed laterally along the electrode surface and multiple second ribs 42 distributed longitudinally along the electrode surface. The first ribs 41 and the second ribs 42 intersect perpendicularly.

[0076] Example 3

[0077] This embodiment provides a grid for a single / double tab battery (hereinafter referred to as grid), such as Figure 3As shown, the grid includes a frame 1 and electrode tabs. The frame 1 includes a top frame, a bottom frame, a left frame, and a right frame. There are two electrode tabs, including a first electrode tab 31 and a second electrode tab 32. Along the length of the top frame of the grid, the first electrode tab 31 and the second electrode tab 32 are symmetrically arranged on the outer side of the top frame. The plane containing the first electrode tab 31 and the second electrode tab 32 is parallel to the grid surface. The distance between the first electrode tab 31 and the second electrode tab 32 is d, the width of the first electrode tab 31 is w1, and the length of the frame 1 is L1, where L1 = d + 2w1. For example, w1 is 3mm, L1 is 66mm, and d is 60mm.

[0078] Specifically, multiple ribs 4 are also provided within the frame 1. The ribs 4 include multiple first ribs 41 distributed laterally along the electrode surface and multiple second ribs 42 distributed longitudinally along the electrode surface. The second ribs 42 on the vertical center line of the upper frame are rectangular and serve as reinforcing ribs. The remaining second ribs 42 are trapezoidal in shape, thicker at the top and thinner at the bottom. Each first rib 41 is V-shaped with an included angle of 150°. 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 as that in the lower part, and the width of the first ribs in the upper part is greater than that in the lower part. The number of first ribs in the upper part accounts for 5 / 13 of the total number of first ribs.

[0079] Example 4

[0080] This embodiment provides a single / double tab grid structure battery, which includes a single cell, such as... Figure 4a As shown, a single-cell battery includes multiple positive and negative plates stacked alternately. The negative plates adopt the grid structure of Example 2, and the positive plates adopt the grid structure of Example 1. In this example, the single-cell battery consists of 4 positive plates and 5 negative plates connected in parallel. The tabs are the connection points of these plates; each plate conducts current through its respective tab. The top of the tab of the positive plate is the positive busbar 5, and the top of the tab of the negative plate is the negative busbar 7. The tabs of the plates in the single-cell battery are then connected in parallel through the busbars. 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.

[0081] 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. It should be noted that the six individual cells can be connected in series in a 1×6 structure. Figure 4a (marked as 4-1#), 2×3 structure ( Figure 5 (marked as 4-2#) or 3×2 structure ( Figure 6 (marked as 4-3#).

[0082] It should be noted that, as Figure 4b As shown, in this embodiment, the positive electrode plate of a single cell can adopt the grid structure of Embodiment 2, and the negative electrode plate can adopt the grid structure of Embodiment 1. The six single cells can be connected in series in a 1×6 structure. Figure 4b , marked as 4-4#, 2×3 structure (marked as 4-5#) or 3×2 structure (marked as 4-6#).

[0083] Example 5

[0084] This embodiment provides a single- and double-tab grid structure battery, which includes a single cell. Each cell includes multiple positive and negative plates arranged in alternating layers. The positive plate of the single cell adopts the grid structure of Embodiment 3, and the negative plate adopts the grid structure of Embodiment 1. The single cell of this embodiment is composed of 4 positive plates and 5 negative plates connected in parallel. The tabs are the connection points of these plates, that is, each plate must conduct current through its own tab. The top of the tab of the positive plate is the positive busbar 5, and the top of the tab of the negative plate is the negative busbar 7. The tabs of each plate in the single cell are then connected in parallel through the busbars. Specifically, in the positive electrode plate, the top of the first tab 31 is the first positive busbar, which connects multiple first tabs in parallel; the top of the second tab 32 is the second positive busbar, which connects multiple second tabs 32 in parallel; the top of the single tab 2 of the negative electrode plate is the negative busbar, which connects multiple single tabs 2 of the negative electrode plate in parallel; the first tab 31 of each positive electrode plate is connected to the positive terminal through the first positive busbar, and the second tab 32 of each positive electrode plate is connected to the positive terminal through the second positive busbar; the single tab 2 of each negative electrode plate is connected to the negative terminal through the negative busbar.

[0085] 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. It should be noted that the six individual cells can be connected in series in a 1×6 structure (marked as 5-1#), a 2×3 structure (marked as 5-2#), or a 3×2 structure (marked as 5-3#).

[0086] It should be noted that, in this embodiment, the design of the ribs and shape of the negative electrode plate can also be the same as that of the positive electrode plate.

[0087] like Figure 8 The diagram shows the cycle performance of the battery. In the diagram, 1# represents a 1×6 battery made with a conventional single-tab electrode plate (e.g., ...). Figure 7As shown in the figure, #2 is a 1×6 battery structure with a 4-4# configuration. All other aspects remain the same. Cycling is then performed, and the figure shows that the battery cycle performance of this invention is superior to that of a traditional single-tab battery.

[0088] like Figure 9 The diagram shows the temperature distribution of the battery. Figure 9 The left figure shows a schematic diagram of the battery prepared using a conventional single-tab electrode plate, while the right figure shows a schematic diagram of the battery prepared according to the present invention (4-4#). Analysis of the temperature distribution in the figures shows that, compared to the battery prepared using a conventional single-tab electrode plate, the battery of the present invention exhibits a more uniform current distribution on the plate surface, generates less heat, and has better temperature uniformity, which is beneficial for improving battery cycle performance.

[0089] The performance data of the battery prepared with a conventional single-tab electrode plate, the 4-4# battery of Example 4, and the 5-1# battery of Example 5 are listed in Table 1 below. It can be seen that the performance of the battery of the present invention is significantly better than that of the battery prepared with a conventional single-tab electrode plate. The 5-1# battery of the present invention performs better than the 4-4# battery.

[0090] It is evident that optimizing the shape and position distribution of the ribs on the positive plate in this invention can improve battery performance. In the single-tab / double-tab grid structure battery of this invention, the single tab is located in the middle of the upper frame of the negative plate, while the two tabs of the positive plate are symmetrically located on the left and right sides of the upper frame of the positive plate. This results in uniform current distribution across the entire plate surface, reducing potential loss and minimizing heat generation during high-current charging and discharging, which is beneficial for high-power operation and extends battery life.

[0091] In the single and double tab grid structure battery of the present invention, the second rib on the vertical line of the upper frame of the positive plate is rectangular, which serves as a reinforcing rib and can improve the creep resistance of the middle part of the plate; the remaining second ribs are thicker at the top and thinner at the bottom, which can help the upper part resist corrosion and the current collection function.

[0092] In the positive plate of the single / double tab grid structure battery of the present invention, the first rib is V-shaped, which can improve the creep resistance of the grid; the distribution of the first rib is sparse at the top and dense at the bottom, which is beneficial 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.

[0093] By controlling the distance between the two tabs of the positive plate to be greater than the width of the single tab of the negative plate, the welding of the busbar is prevented when the tabs of the positive and negative plates are too close. The single and double tab grid structure battery of the present invention has a simple manufacturing process and is suitable for large-scale industrial production.

[0094] Table 1 Performance data of different batteries

[0095]

[0096] 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.

[0097] It should be noted that, in order to reduce costs, the inventors reduced the thickness of the negative electrode plate of the 5-1# battery structure by 10% and the number of ribs by 6%. The cycle performance of the battery is comparable to that of the 5-1# battery, and the cost is reduced by more than 15%.

[0098] 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 single / double tab grid structure battery suitable for power batteries, characterized in that, The single and double tab grid structure battery includes a single cell battery, and the single cell battery includes multiple positive plates and multiple negative plates arranged alternately; each of the positive plates and each of the negative plates includes a frame (1) and a tab, and the frame (1) includes an upper frame, a lower frame, a left frame and a right frame; Each of the positive electrode plates includes a first electrode (31) and a second electrode (32). Along the length of the upper frame, the first electrode (31) and the second electrode (32) are symmetrically arranged on the upper frame. The plane containing the first electrode (31) and the second electrode (32) is parallel to the electrode surface of the positive electrode plate. The first electrode (31) and the second electrode (32) have the same size. Each negative electrode plate has one tab, referred to as a single tab (2). The single tab (2) is located in the middle of the upper frame of the negative electrode plate, and the plane of the single tab (2) is parallel to the electrode plate surface of the negative electrode plate. The relationship between the distance d between the first electrode (31) and the second electrode (32), the width w of the single electrode (2), and the length L1 of the upper frame is as follows: L1≥d>w; Ribs (4) are provided inside the frame (1) of both the positive and negative plates; In the positive electrode plate, 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. In the positive electrode plate, the second rib (42) located on the vertical line of the upper frame of the positive electrode plate is rectangular, and the shape of the remaining second ribs (42) is as follows: along the direction away from the upper frame, the width of the second rib (42) gradually decreases; In the positive electrode plate, the distribution of the first ribs (41) is along the direction away from the upper frame, and the distance between two adjacent first ribs (41) gradually decreases; In the positive electrode plate, the width of the upper first rib is greater than the width of the lower first rib; The thickness of the negative electrode plate is less than that of the positive electrode plate; the thickness of the negative electrode plate is 80% to 95% of the thickness of the positive electrode plate; the number of ribs in the negative electrode plate is 80% to 95% of the number of ribs in the positive electrode plate.

2. The single / double tab grid structure battery according to claim 1, characterized in that, In the negative electrode plate, 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, wherein the first ribs (41) and the second ribs (42) intersect perpendicularly.

3. The single / double tab grid structure battery according to claim 1, characterized in that, The remaining second ribs (42) are trapezoidal in shape.

4. The single / double tab grid structure battery according to claim 1, characterized in that, The included angle of the V-shape is greater than 90° and less than 180°.

5. The single / double tab grid structure battery according to any one of claims 1-4, characterized in that, The number of individual battery cells is one or more.

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