A bipolar tab grid for a lead-acid battery

Abstract

The application relates to a bipolar lug grid for a lead-acid storage battery, and belongs to the technical field of lead-acid storage batteries, which is used to solve the problems of uneven current distribution in the internal plate of an existing lead-acid storage battery and short cycle life of the battery. The bipolar lug grid for the lead-acid storage battery comprises a frame and lug, the frame comprises an upper frame, a lower frame, a left frame and a right frame; the lug comprises a first lug and a second lug, the first lug and the second lug are symmetrically arranged on the upper frame; a rib is arranged in the frame, the rib comprises a plurality of first ribs distributed transversely on the surface of the grid and a plurality of second ribs distributed longitudinally on the surface of the grid, the shape of each first rib is V-shaped, and the opening faces the upper frame; the first lug and the second lug are of the same size, and the distance d between the first lug and the second lug and the width w of the first lug, the length L of the upper frame satisfy the following relationship: L >= d + 2w. The cycle life of the lead-acid storage battery adopting the bipolar lug grid for the lead-acid storage battery is long.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lead-acid storage batteries, in particular to a bipolar tab grid for lead-acid storage batteries. BACKGROUND

[0002] Lead-acid storage batteries have a history of more than 100 years since their invention, and are one of the most widely used chemical power sources in the world. The raw materials are abundant, inexpensive and renewable. The storage battery is mainly composed of positive and negative plates, separators, battery cases and other components, and the plate is mainly composed of a grid and active material. The traditional lead-acid battery grid is composed of a thick frame and a tab, which is mainly used to support the positive and negative electrochemical active materials and collect the current of the entire plate through the tab.

[0003] Therefore, in addition to being easy to forge, the grid design should also meet the mechanical requirements of the grid surface directly contacting the active material and the uniform distribution of current throughout the plate with the smallest ohmic voltage drop. Currently, the battery grids on the market are generally single-tab grids, and the positive and negative grid tabs are on one side of the grid. This design will cause uneven utilization of the upper and lower active materials of the plate, and there will be a concentration difference between the upper and lower electrolytes, which will seriously affect the service life of the battery. If subjected to high current charging and discharging, the internal resistance will increase sharply, which may lead to thermal runaway and damage the battery. CN103840173B discloses a bipolar tab grid, which includes an upper frame, a lower frame corresponding to the upper frame, a left frame, a right frame opposite to the left frame, and a plurality of vertical ribs and a plurality of horizontal ribs arranged horizontally and vertically. The grid further includes two tabs, which are located on the upper frame and the lower frame of the grid and are diagonally arranged. This kind of bipolar tab grid has the problem of complex process in the manufacturing process, and the sealing requirement is relatively high.

[0004] The lead-acid storage battery plates prepared by the existing grid structure have uneven internal current distribution, large ohmic voltage drop and short cycle life of the battery. SUMMARY

[0005] In view of the above analysis, the embodiments of the present application aim to provide a bipolar tab grid for lead-acid storage batteries, which can at least solve one of the following problems: the internal current distribution of the existing lead-acid storage battery grid is uneven, the ohmic voltage drop is large, and the cycle life of the battery is short.

[0006] The application provides a bipolar tab grid for a lead-acid storage battery, which comprises a frame and a tab, the frame comprises an upper frame, a lower frame, a left frame and a right frame; the tab comprises a first tab and a second tab, which are symmetrically arranged on the upper frame along the length direction of the upper frame of the grid; the plane where the first tab and the second tab are located is parallel to the grid surface; a rib is arranged in the frame, the rib comprises a plurality of first ribs distributed transversely along the grid surface and a plurality of second ribs distributed longitudinally along the grid surface, the shape of each first rib is V-shaped, and the opening faces the upper frame.

[0007] The size of the first tab and the second tab is the same, and the distance d between the first tab and the second tab, the width w of the first tab and the length L of the upper frame satisfy the following relationship: L≥d+2w.

[0008] Further, the second rib located on the median line of the upper frame is rectangular, and the shape of the remaining second ribs is that the width of the second rib gradually decreases in the direction away from the upper frame.

[0009] Further, the shape of the second rib is trapezoidal.

[0010] Further, the distribution of the first rib is that the distance between two adjacent first ribs is not completely the same in the direction away from the upper frame.

[0011] Further, the distribution of the first rib is that the distance between two adjacent first ribs gradually decreases in the direction away from the upper frame.

[0012] Further, the V-shaped included angle of the V-shaped first rib is greater than 90° and less than 180°.

[0013] Further, the width of the first rib is not completely the same.

[0014] Further, the length difference between the upper side and the lower side of the second rib is 0.6-1.5 mm.

[0015] Further, the distance between two adjacent first ribs is 10-2 mm.

[0016] Further, in the direction away from the upper frame, 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, the width of the first rib in the upper part is greater than that in the lower part, and the number of the first rib in the upper part accounts for 1 / 4-1 / 2 of the total number of the first rib.

[0017] Further, the thickness of the first tab and the second tab is less than the thickness of the frame.

[0018] Compared with the prior art, the present application can achieve at least one of the following beneficial effects:

[0019] (1) The bipolar tab grid for lead-acid battery provided by the present application has two symmetrical tabs on the left and right sides of the upper frame through optimization of the tab structure, the current distribution on the entire plate surface is uniform, and the potential loss is reduced. The generation of heat in the battery can be reduced during large-current charging and discharging, which is conducive to high-power work of the battery and prolongs the service life of the battery.

[0020] (2) The second rib on the vertical line of the upper frame of the bipolar tab grid for lead-acid battery is rectangular, which plays a role of reinforcing rib and can improve the anti-creep ability of the middle part of the plate; the rest of the second ribs are thick at the top and thin at the bottom, which can be conducive to the corrosion resistance and current collection of the upper part.

[0021] (3) The first rib of the bipolar tab grid is V-shaped, which can improve the anti-creep ability 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 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 corrosion of the rib under the premise of reducing the cost.

[0022] In the present application, the above technical solutions can be combined with each other to achieve more preferred combination schemes. Other features and advantages of the present application will be described in the subsequent specification, and some advantages will become apparent from the specification or be understood by implementing the present application. The purpose and other advantages of the present application can be achieved and obtained through the contents specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings are included to provide a further understanding of the embodiments, and are incorporated in and constitute a part of this specification, illustrate embodiments of the application, and together with the description serve to explain the principles of the application. In the drawings:

[0024] Figure 1 FIG. 1 is a structural schematic diagram of a bipolar tab grid of an embodiment 1;

[0025] Figure 2 FIG. 2 is a structural schematic diagram of a single-tab grid of an embodiment 2;

[0026] Figure 3a FIG. 3 is a structural schematic diagram of a bipolar tab grid of an embodiment 3;

[0027] Figure 3b FIG. 4 is a structural schematic diagram of another bipolar tab grid of an embodiment 3;

[0028] Figure 4a FIG. 5 is a structural schematic diagram of a battery of an embodiment 4;

[0029] Figure 4b FIG. 6 is a structural schematic diagram of a battery of an embodiment 4;

[0030] Figure 5 A structural schematic diagram of the battery of Example 4;

[0031] Figure 6 A structural schematic diagram of the battery of Example 4;

[0032] Figure 7a A structural schematic diagram of the battery of Example 5;

[0033] Figure 7b A structural schematic diagram of the battery of Example 5;

[0034] Figure 8 A structural schematic diagram of the battery of Example 5;

[0035] Figure 9a A structural schematic diagram of the battery of Example 5;

[0036] Figure 9b A structural schematic diagram of the battery of Example 5;

[0037] Figure 10 A 1x6 structure battery prepared by a conventional single tab plate.

[0038] Reference signs:

[0039] 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 post, 7 - negative busbar, 8 - negative terminal post. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present application will be described in detail with reference to the drawings, wherein the drawings form a part of the description. The drawings illustrate the principles of the present application and, together with the description, serve to explain the present application.

[0041] The internal current distribution of the lead-acid battery plate prepared by the existing grid structure is uneven, the ohmic voltage drop is large, and the cycle life of the battery is short or the manufacturing process is complex. Therefore, the inventor has conducted long-term and in-depth research on several typical grid structures and batteries, and compared the performance of batteries with different grid structures in order to obtain a grid structure with excellent performance.

[0042] The present application provides a bipolar tab grid for a lead-acid battery, which comprises Figure 1As shown, the bipolar tab grid for lead-acid battery includes a frame 1 and a tab, the frame 1 includes an upper frame, a lower frame, a left frame and a right frame; the tab includes a first tab 31 and a second tab 32; along the length direction of the upper frame of the grid, the first tab 31 and the second tab 32 are symmetrically arranged on the upper frame, the plane where the first tab 31 and the second tab 32 are located is parallel to the grid surface; a plurality of horizontal and vertical intersecting ribs 4 are arranged in the frame 1, the ribs 4 include a plurality of first ribs 41 distributed horizontally along the surface of the plate and a plurality of second ribs 42 distributed longitudinally along the surface of the plate; the shape of each first rib 41 is V-shaped, and the opening is directed to the upper frame; the size of the first tab 31 and the second tab 32 is the same, the distance d between the first tab 31 and the second tab 32 (d refers to the distance between the two nearest edges of the first tab 31 and the second tab 32) and the width w of the first tab 31, the length L of the upper frame are related as follows: L≥d+2w.

[0043] The traditional grid is mostly single-tab grid, the tab is located on one side of the upper frame of the grid, the current distribution of the whole plate is uneven, and the ohmic voltage drop is large. Compared with the prior art, the bipolar tab grid for lead-acid battery provided by the present application, by optimizing the structure of the tab, the tabs of the bipolar tab grid are symmetrically located on the left and right sides of the upper frame, the current distribution of the whole plate surface is uniform, and the potential loss is reduced. When large current charging and discharging, the generation of battery heat can be reduced, which is beneficial to the high-power work of the battery and prolongs the service life of the battery; and the first rib is V-shaped, which can improve the anti-creep ability of the grid.

[0044] Specifically, the length of the upper frame is L, the distance between the first tab 31 and the second tab 32 is d, considering that d is too small, the first tab 31 and the second tab 32 are almost coincident; d is too large, which is not conducive to specific manufacturing. Therefore, L≥d+2w≥5mm is controlled. Exemplarily, L=d+2w.

[0045] Specifically, in the bipolar tab grid for lead-acid battery, the second rib 42 located on the median line of the upper frame is rectangular, which plays the role of reinforcing rib and can improve the anti-creep ability of the middle part of the plate (once the plate creeps, it will be pushed to the bus bar, which will be short-circuited and failed); the shape of the rest of the second rib 42 is: along the direction away from the upper frame, the width of the second rib 42 gradually decreases, that is, the upper part is thick and the lower part is thin, exemplarily, the shape of the second rib 42 is trapezoidal, the edge length of the edge close to the upper frame is greater than the edge length of the edge away from the tab. The setting mode of the second rib 42 with thick upper part and thin lower part can be beneficial to the anti-corrosion and current collection of the upper part.

[0046] Specifically, the length difference between the upper edge length and the lower edge length of the second rib 42 is 0.6-1.5mm.

[0047] Specifically, in the bipolar lug grid for lead-acid batteries, each first rib 41 is V-shaped, and the opening faces the upper frame. The V-shaped first rib 41 can improve the creep resistance of the grid. For example, the V-shaped first rib 41 has an included angle of 90° or more and less than 180°.

[0048] Specifically, the distribution of the first rib 41 is that, along the direction away from the upper frame, the distance between adjacent two first ribs 41 is not completely the same.

[0049] Specifically, the distribution of the first rib 41 is that, along the direction away from the upper frame, the distance between adjacent two first ribs 41 gradually decreases. Such an arrangement is beneficial to improve the utilization rate of active material at the bottom of the plate.

[0050] Specifically, the distance between adjacent two first ribs 41 is 10-20 mm.

[0051] Considering that the reaction at the upper part of the plate is more intense and the corrosion of the rib is more serious, in order to reduce the corrosion of the rib and reduce the cost, preferably, in the bipolar lug grid, the width of the first rib 41 is not completely the same.

[0052] In one possible design, along the direction away from the upper frame, the width of the first rib at the upper part is the same, the width of the first rib at the lower part is the same, and the width of the first rib at the upper part is greater than the width of the first rib at the lower part. For example, the number of first ribs at the upper part accounts for 1 / 4-1 / 2 of the total number of first ribs.

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

[0054] Specifically, in the bipolar lug grid, the size of the first lug 31 and the second lug 32 is the same. Specifically, the size of the first lug 31 and the second lug 32 is designed according to the specific battery model. For example, the size of the first lug 31 and the second lug 32 is 3-10 mm in width and 3-10 mm in height.

[0055] Specifically, the thickness of the first lug 31 and the second lug 32 is slightly smaller than the thickness of the frame 1, and the difference between the thickness of the frame 1 and the thickness of the first lug 31 and the second lug 32 is 0.5-3 mm.

[0056] It should be noted that the above-mentioned bipolar lug grid for lead-acid batteries can be used as a grid of a power battery. The power battery is generally discharged at a discharge rate of about 0.5C and charged at about 0.25C. At such a rate, the ion migration between the positive and negative plates has a large interactive effect, and the lug and rib arrangement need to be specifically designed.

[0057] The grid of this invention is applicable to power batteries that are different from those used in automobile starting batteries. Automobile 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.

[0058] 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.

[0059] To demonstrate the beneficial effects of the bipolar tab grid for lead-acid batteries of the present invention, the inventors compared several typical solutions during their research process, as described below.

[0060] Example 1

[0061] This embodiment provides a bipolar plate grid for a lead-acid battery, such as... Figure 1 As shown, the grid 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 grid, the first electrode ear 31 and the second electrode ear 32 are symmetrically arranged on the upper frame, and the plane containing the first electrode ear 31 and the second electrode ear 32 is parallel to the grid surface. Ribs 4 are provided inside 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. 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 size. 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.

[0062] Specifically, w is 3mm, L is 66mm, and d is 60mm.

[0063] 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.

[0064] The difference between the thickness of the frame 1 and the thickness of the first tab 31 is 1mm.

[0065] Example 2

[0066] The embodiment provides a grid for a lead-acid storage battery (hereinafter referred to as a grid), which comprises Figure 2 As shown in the figure, the grid comprises a frame 1 and a tab, the frame 1 comprises an upper frame, a lower frame, a left frame and a right frame; the number of the tab is 1, which is referred to as a single tab 2, the single tab 2 is located at the middle position of the upper frame, and the plane where the single tab 2 is located is parallel to the surface of the grid. The width of the single tab 2 is 5 mm, the height of the single tab 2 is 10 mm, the thickness of the single tab 2 is slightly smaller 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 1 mm. A plurality of horizontal and vertical intersecting ribs 4 are arranged in the interior of the frame 1, the ribs 4 comprise a plurality of first ribs 41 distributed horizontally along the direction of the plate and a plurality of second ribs 42 distributed vertically along the direction of the plate, and the first ribs 41 and the second ribs 42 are perpendicular to each other.

[0067] Embodiment 3

[0068] The embodiment provides a grid for a lead-acid storage battery, which comprises Figure 3a As shown in the figure, the grid comprises a frame 1 and a tab, the frame 1 comprises an upper frame, a lower frame, a left frame and a right frame; the number of the tab is 1, which is referred to as a single tab 2, the single tab 2 is located at the middle position of the upper frame, and the plane where the single tab 2 is located is parallel to the surface of the grid. The width of the single tab 2 is 5 mm, the height of the single tab 2 is 10 mm, the thickness of the single tab 2 is slightly smaller 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 1 mm. A plurality of horizontal and vertical intersecting ribs 4 are arranged in the interior of the frame 1, the ribs 4 comprise a plurality of first ribs 41 distributed horizontally along the direction of the plate and a plurality of second ribs 42 distributed vertically along the direction of the plate, and the first ribs 41 and the second ribs 42 are perpendicular to each other.

[0069] In a possible design, as shown in the figure, Figure 3b 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, L1=d1+2w1. For example, w1 is 3 mm, L1 is 66 mm, and d1 is 60 mm.

[0070] Embodiment 4

[0071] The embodiment provides a lead-acid storage battery, which comprises a single-grid cell, as shown in the figure, Figure 4a The single-grid cell comprises a plurality of positive plates and negative plates which are alternately and laminatedly arranged, and the negative plate of the lead-acid storage battery adopts the grid of the embodiment 3. Figure 3bThe lead-acid battery uses the grid structure of Example 2 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 number of plates can be either 4 positive plates and 5 negative plates, or 5 positive plates and 6 negative plates, depending on the battery capacity and model.

[0072] 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 through the positive bus 5, and the tabs of each negative plate are connected to the negative terminal 8 through the negative bus 7. 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#).

[0073] It should be noted that, as Figure 4b As shown, in this embodiment, the positive plate of the lead-acid battery can also adopt the grid structure of Embodiment 3b, and the negative plate of the lead-acid battery can adopt the grid structure of Embodiment 2. The six individual 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#).

[0074] Example 5

[0075] This embodiment provides a lead-acid battery, including a single cell, such as... Figure 7a , 7b As shown, a single-cell battery includes multiple positive and negative plates stacked alternately, with the negative plate employing the method described in Example 3. Figure 3b The grid structure is as follows: the positive plate adopts the grid structure of Example 3a. The single cell of this example is composed of 4 positive plates and 5 negative plates connected in parallel. 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 connected in parallel through the busbar.

[0076] 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 through the positive bus 5, and the tabs of each negative plate are connected to the negative terminal 8 through the negative bus 7. The six individual cells can be connected in series in a 1×6 structure.Figure 7a (marked as 5-1#), 2×3 structure (marked as 5-2#), or 3×2 structure ( Figure 9a (marked as 5-3#).

[0077] It should be noted that in this embodiment, the positive electrode plate of a single cell may also adopt the design of Embodiment 3. Figure 3a The grid structure of the single cell is as described in Example 2. The six single cells can be connected in series in a 1×6 structure. Figure 7b (marked as 5-4#), 2×3 structure ( Figure 8 (marked as 5-5#) or 3×2 structure ( Figure 9b (marked as 5-6#).

[0078] Example 6

[0079] 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 grid structure of Embodiment 1, and the negative plate uses the grid 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.

[0080] 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.

[0081] Example 7

[0082] 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 grid structure of Embodiment 1, and the negative plate adopts the grid structure of Embodiment 3a. 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 7-1#), a 2×3 structure, or a 3×2 structure.

[0083] 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.

[0084] like Figure 10 The image shows a 1×6 battery fabricated using a conventional monopole plate.

[0085] The performance data of the batteries prepared by conventional single-tab plates, the 4-4# battery of Example 4, the 6-1# battery of Example 6, the 5-4# battery of Example 5, and the 7-1# battery of Example 7 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.

[0086] It can be seen that the shape and position distribution of the ribs of the positive plate are optimized in the application, which can further improve the performance of the battery. The second rib on the median line of the upper frame of the bipolar lug grid of the lead-acid battery is rectangular, which plays the role of a reinforcing rib and can improve the anti-creep ability of the middle part of the plate. The remaining second ribs are thick at the top and thin at the bottom, which can be beneficial to the corrosion resistance and current collection of the upper part. The first rib of the bipolar lug grid is V-shaped, which can improve the anti-creep ability of the grid. The distribution of the first rib is sparse at the top and dense at the bottom, which is beneficial to improve 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 corrosion of the rib under the premise of reducing the cost.

[0087] Table 1 Performance data of different batteries

[0088]

[0089] Note: The improvement of active material utilization rate and power characteristics in the table refers to the comparison with the battery prepared by the traditional single lug plate.

[0090] The above description is only a preferred specific embodiment of the application, but the protection scope of the application is not limited to this. Any changes or replacements within the technical range disclosed by the application can be easily thought of by those skilled in the art, which should be covered within the protection scope of the application.

Claims

1. A bipolar tab grid for a lead-acid battery for use as a power battery, characterized in that, The bipolar tab grid for lead-acid storage batteries comprises a frame (1) and a tab, the frame (1) comprises an upper frame, a lower frame, a left frame and a right frame; the tab comprises a first tab (31) and a second tab (32), which are symmetrically arranged on the upper frame along the length direction of the upper frame of the grid; the plane where the first tab (31) and the second tab (32) are located is parallel to the grid surface; a rib (4) is arranged in the frame (1), the rib (4) comprises a plurality of first ribs (41) distributed transversely along the surface of the plate and a plurality of second ribs (42) distributed longitudinally along the surface of the plate, the shape of each first rib (41) is V-shaped, and the opening is directed to the upper frame; The size of the first tab (31) and the second tab (32) is the same, and the distance d between the first tab (31) and the second tab (32) and the width w of the first tab (31) and the length L of the upper frame satisfy the following relationship: L≥d+2w≥5mm; The second rib (42) located on the median line of the upper frame is rectangular, and the shape of the remaining second rib (42) is that the width of the second rib (42) gradually decreases in the direction away from the upper frame; the length difference between the upper side length and the lower side length of the second rib (42) is 0.6-1.5mm; The distribution of the first rib (41) is that the distance between two adjacent first ribs (41) gradually decreases in the direction away from the upper frame; The width of the first rib (41) is not completely the same; In the direction away from the upper frame, 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 that in the lower part; The thickness of the first tab (31) and the second tab (32) is less than the thickness of the frame (1); The difference between the thickness of the frame (1) and the thickness of the first tab (31) and the second tab (32) is 0.5-3mm.

2. The bipolar tab grid for a lead-acid battery of claim 1, characterized in that, The shape of the second rib (42) is trapezoidal.

3. The bi-polar tab grid for a lead-acid battery of claim 1, wherein, The V-shaped angle of the V-shaped first rib (41) is greater than 90° and less than 180°.

4. The bi-polar tab grid for lead-acid batteries of claim 1, wherein, The distance between the two adjacent first ribs (41) is 10-2mm.

5. The bi-polar tab grid for a lead-acid battery of claim 1, wherein, The number of the first rib in the upper part accounts for 1 / 4-1 / 2 of the total first rib.

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