CN115602857A - Bipolar ear plate grid for lead-acid storage battery - Google Patents

Abstract

The invention relates to a bipolar ear plate grid for a lead-acid storage battery, belongs to the technical field of lead-acid storage batteries, and is used for solving the problems of uneven current distribution inside a polar plate of the conventional lead-acid storage battery and short cycle life of the battery. The bipolar lug plate grid for the lead-acid storage battery comprises a frame and lugs, wherein the frame comprises an upper frame, a lower frame, a left frame and a right frame; the tabs comprise a first tab and a second tab, and the first tab and the second tab are symmetrically arranged on the upper frame; ribs are arranged in the frame, the ribs comprise a plurality of first ribs transversely distributed along the surface of the grid and a plurality of second ribs longitudinally distributed along the surface of the grid, each first rib is V-shaped, and the opening of each first rib faces the upper frame; the size of first utmost point ear and second utmost point ear is the same, and the distance d between first utmost point ear and the second utmost point ear and the width w of first utmost point ear, the relation of the length L of going up the border are as follows: l is more than or equal to d +2w. The lead-acid storage battery adopting the bipolar lug plate grid for the lead-acid storage battery has long cycle life.

Description

Bipolar ear plate grid for lead-acid storage battery

Technical Field

The invention relates to the field of lead-acid storage batteries, in particular to a bipolar ear plate grid for a lead-acid storage battery.

Background

Lead-acid batteries have been invented for over one hundred years and are one of the most widely used chemical power sources worldwide. The raw material source is rich, the price is low, and the raw material can be regenerated and recycled. The accumulator consists of positive and negative plates, partition board, battery case and other parts, and the plate consists of plate grid and active matter. The traditional lead-acid battery grid consists of a thick side frame and tabs and is mainly used for supporting positive and negative electrochemical active substances and collecting current of the whole polar plate to flow out through the tabs.

Therefore, the grid design needs easy forging, and also meets the requirements of good direct contact and mechanical property between the grid surface and the active material, and simultaneously, the current is uniformly distributed in the whole polar plate, and the ohmic pressure drop is minimum. At present, the grids of storage batteries in the market are single-pole lug grids generally, positive and negative grids have lugs on one side of the grids, and the batteries with the design can cause uneven utilization rate of active substances on the upper and lower parts of a polar plate and have concentration difference of upper and lower electrolytes, thereby seriously influencing the service life of the batteries. If large current charging and discharging is carried out, the internal resistance is increased sharply, and thermal runaway may be caused, and the storage battery may be damaged. CN103840173B discloses a bipolar ear plate 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 crosswise, wherein the grid further includes two tabs respectively located on the upper frame and the lower frame of the grid and arranged diagonally.

The current distribution in the lead-acid storage battery pole plate prepared by the conventional grid structure is uneven, the ohmic voltage drop is large, and the cycle life of the battery is short.

Disclosure of Invention

In view of the above analysis, the embodiment of the present invention aims to provide a double-tab grid for a lead-acid battery, which can solve at least one of the following problems: the current distribution in the polar plate of the grid for the existing lead-acid storage battery is not uniform, the ohmic voltage drop is large, and the cycle life of the battery is short.

The invention provides a bipolar ear plate grid for a lead-acid storage battery, which comprises a frame and a lug, wherein the frame comprises an upper frame, a lower frame, a left frame and a right frame; the lugs comprise a first lug and a second lug, and the first lug and the second lug are symmetrically arranged on the upper frame along the length direction of the upper frame of the grid; the plane where the first lug and the second lug are located is parallel to the plane of the grid; ribs are arranged in the frame, the ribs comprise a plurality of first ribs transversely distributed along the surface of the grid and a plurality of second ribs longitudinally distributed along the surface of the grid, each first rib is V-shaped, and the opening of each first rib faces the upper frame;

the size of first utmost point ear and second utmost point ear is the same, the distance d between first utmost point ear and the second utmost point ear and the width w of first utmost point ear, the length L's of going up the border relation as follows: l is more than or equal to d +2w.

Further, the second rib that is located the perpendicular bisector of last frame is the rectangle, and the shape of remaining second rib is: along the direction of keeping away from last frame, the width of second rib reduces gradually.

Further, the shape of the second ribs is trapezoidal.

Further, the distribution of the first ribs is: the distance between two adjacent first ribs is not completely the same along the direction far away from the upper frame.

Further, the distribution of the first ribs is: along the direction of keeping away from last frame, the distance between two adjacent first ribs reduces gradually.

Furthermore, the V-shaped included angle of the V shape is more than 90 degrees and less than 180 degrees.

Further, the widths of the first ribs are not all the same.

Furthermore, the side length difference between the upper side length and the lower side length of the second ribs is 0.6-1.5 mm.

Furthermore, the distance between two adjacent first ribs is 10-2 mm.

Furthermore, along the direction far away from the upper frame, the widths of the first ribs of the upper part are the same, the widths of the first ribs of the lower part are the same, and the widths of the first ribs of the upper part are greater than the widths of the first ribs of the lower part; the number of the first ribs of the upper part accounts for 1/4-1/2 of the total first ribs.

Further, the thickness of the first tab and the second tab is smaller than that of the frame.

Compared with the prior art, the invention can realize at least one of the following beneficial effects:

(1) According to the bipolar lug plate grid for the lead-acid storage battery, the lug structure is optimized, the two lugs are symmetrically positioned on the left side and the right side of the upper frame, the current of the whole plate surface is uniformly distributed, and the potential loss is reduced. The battery can reduce the heat generation of the battery during the heavy current charging and discharging, is favorable for the high-power work of the battery, and prolongs the service life of the battery.

(2) The second ribs on the perpendicular bisector of the upper frame of the bipolar ear plate grid for the lead-acid storage battery are rectangular, play a role of reinforcing ribs and can improve the creep resistance of the middle part of the polar plate; the rest second ribs are thick at the top and thin at the bottom, so that the corrosion resistance and the current collection effect of the upper part can be facilitated.

(3) The first ribs of the double-lug grid are V-shaped, so that the creep resistance of the grid can be improved; the first ribs are distributed in a manner of being sparse at the upper part and dense at the lower part, so that the utilization rate of active substances at the bottom of the polar plate is improved; the first rib of upper portion is thicker, and the first rib of lower part is thinner can be under the prerequisite that reduces the corruption of rib, reduce cost.

In the invention, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.

Fig. 1 is a schematic structural view of a double-tab grid of example 1;

fig. 2 is a schematic structural view of a unipolar lug grid of example 2;

fig. 3a is a schematic structural diagram of a double-pole grid of embodiment 3;

fig. 3b is a schematic structural diagram of another double-pole grid of embodiment 3;

FIG. 4a is a schematic structural view of a battery according to example 4;

fig. 4b is a schematic structural view of the battery of embodiment 4;

fig. 5 is a schematic view of a structure of the battery of embodiment 4;

fig. 6 is a schematic structural view of a battery according to example 4;

FIG. 7a is a schematic structural view of a battery according to example 5;

FIG. 7b is a schematic structural view of a battery according to example 5;

FIG. 8 is a schematic view of a structure of a battery according to example 5;

FIG. 9a is a schematic structural view of a battery according to example 5;

FIG. 9b is a schematic diagram of a structure of the battery of example 5;

fig. 10 is an internal view of a 1 × 6 structure battery fabricated by a conventional monopolar ear plate.

Reference numerals:

1-frame, 2-single-pole lug, 31-first lug, 32-second lug, 4-rib, 41-first rib, 42-second rib, 5-positive bus bar, 6-positive wiring column, 7-negative bus bar and 8-negative wiring column.

Detailed Description

The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention and not to limit its scope.

The current distribution in the lead-acid storage battery pole plate prepared by the conventional grid structure is uneven, the ohmic voltage drop is large, the cycle life of the battery is short or the manufacturing process is complex. Therefore, through long-term intensive research, the inventors research several typical grid structures and batteries, and compare the performances of the batteries with different grid structures so as to obtain a grid structure with excellent performances.

The invention provides a bipolar lug plate grid for a lead-acid storage battery, which comprises a frame 1 and lugs, wherein the frame 1 comprises an upper frame, a lower frame, a left frame and a right frame; the tabs comprise a first tab 31 and a second tab 32; along the length direction of an upper frame of the grid, a first lug 31 and a second lug 32 are symmetrically arranged on the upper frame, and the planes of the first lug 31 and the second lug 32 are parallel to the surface of the grid; a plurality of ribs 4 which are crossed transversely and vertically are arranged in the frame 1, and each rib 4 comprises a plurality of first ribs 41 which are distributed transversely along the surface of the pole plate and a plurality of second ribs 42 which are distributed longitudinally along the surface of the pole plate; each first rib 41 is in a V shape, and the opening of each first rib faces the upper frame; the first tab 31 and the second tab 32 have the same size, and the distance d between the first tab 31 and the second tab 32 (d is the distance between the two nearest edges of the first tab 31 and the second tab 32) has the following relationship with the width w of the first tab 31 and the length L of the upper frame: l is more than or equal to d +2w.

Most of the traditional grids are single-pole lug grids, lugs are located on one side of an upper frame of the grids, the current of the whole polar plate is not uniformly distributed, and ohmic pressure drop is large. Compared with the prior art, the double-pole lug plate grid for the lead-acid storage battery has the advantages that the lug structures are optimized, the lugs of the double-pole lug plate grid are symmetrically positioned on the left side and the right side of the upper frame, the current of the whole plate surface is uniformly distributed, and the potential loss is reduced. The heat generation of the battery can be reduced during heavy current charging and discharging, the high-power work of the battery is facilitated, and the service life of the battery is prolonged; and the first ribs are V-shaped, so that the creep resistance of the grid can be improved.

Specifically, the length of the upper frame is L, the distance between the first tab 31 and the second tab 32 is d, and considering that d is too small, the first tab 31 and the second tab 32 are approximately overlapped; d is too large to facilitate specific manufacturing. Therefore, L is controlled to be more than or equal to d +2w and more than or equal to 5mm. Exemplarily, L = d +2w.

Specifically, in the double-tab grid for the lead-acid storage battery, the second ribs 42 positioned on the perpendicular bisector of the upper frame are rectangular, play a role of reinforcing ribs, and can improve the creep resistance of the middle part of the polar plate (once the polar plate grows in creep, the polar plate is pushed onto a busbar, and short circuit failure occurs); the remaining second ribs 42 are shaped: in a direction away from the upper frame, the width of the second ribs 42 gradually decreases, that is, the upper end is thicker and the width gradually decreases downward, and in an exemplary shape, the second ribs 42 are trapezoidal, and the side length of the side close to the upper frame is larger than the side length of the side away from the tab. The arrangement of the second ribs 42 with a thick upper part and a thin lower part can facilitate the corrosion resistance and the current collecting effect of the upper part.

Specifically, the side length difference between the upper side length and the lower side length of the second ribs 42 is 0.6-1.5 mm.

Specifically, in the bipolar lug plate grid for the lead-acid storage battery, each first rib 41 is in a V shape, the opening of the first rib faces the upper frame, and the creep resistance of the plate grid can be improved due to the V-shaped first ribs 41. Illustratively, the V-shaped included angle of the V-shape is 90 ° or more and less than 180 °.

Specifically, the distribution of the first ribs 41: the distance between two adjacent first ribs 41 is not exactly the same in the direction away from the upper frame.

Specifically, the distribution of the first ribs 41: along the direction of keeping away from last frame, from top to bottom the interval of arranging dwindles gradually, first rib 41's distribution is dredged from top to bottom closely promptly, along the direction of keeping away from last frame promptly, and the distance between two adjacent first ribs 41 reduces gradually, so sets up, is favorable to improving polar plate bottom active material's utilization ratio.

Specifically, the distance between two adjacent first ribs 41 is 10 to 2mm.

Considering that the rib corrosion is more severe due to the more severe reaction at the upper part of the plate, and thus, in order to reduce the cost on the premise of reducing the rib corrosion, it is preferable that the width of the first rib 41 in the double-tab grid is not completely the same.

In one possible design, the width of the first ribs of the upper part is the same, the width of the first ribs of the lower part is the same, and the width of the first ribs of the upper part is greater than that of the first ribs of the lower part along the direction away from the upper frame; illustratively, the number of first ribs of the upper portion is 1/4 to 1/2 of the total first ribs.

In one possible design, the width of the first ribs decreases gradually in a direction away from the upper rim.

Specifically, in the double-tab grid, the first tab 31 and the second tab 32 have the same size, specifically, the size of the first tab 31 and the size of the second tab 32 are designed according to the specific battery model, and exemplarily, the size of the first tab 31 and the size of the second tab 32 are 3-10 mm wide and 3-10 mm high.

Specifically, the thickness of the first tab 31 and the second tab 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 tab 31 and the second tab 32 is 0.5-3 mm.

The bipolar lug plate for a lead-acid storage battery can be used as a grid of a power battery, and the power battery is generally discharged at a discharge rate of about 0.5C and charged at about 0.25C. Under the multiplying power, the ion migration between the positive and negative plates has large interaction influence, and the arrangement of the lugs and the ribs needs to be specially designed.

The power battery applicable to the grid is different from a battery for starting an automobile, the battery for starting the automobile needs instantaneous large current output capacity, therefore, in the aspect of rib distribution of a positive plate, the internal resistance of the ribs is the lowest as a main design principle, radial rib distribution is generally adopted, and because the discharge time is extremely short, the interaction influence generated by ion migration between a positive electrode and a negative electrode in the discharge process can be smaller, and the influence on the relative positions of the positive electrode and the negative electrode ears is smaller.

The power battery is different from a colloid energy storage battery, the colloid energy storage battery generally adopts low-rate discharge below 10hr, the interaction influence of the ion migration rate on the positive electrode and the negative electrode is small, and therefore the relative position influence of the positive electrode lug and the negative electrode lug is small.

In order to embody the beneficial effects of the double-lug grid for the lead-acid storage battery, the inventor compares a plurality of typical schemes in the research process, as described below.

Example 1

The embodiment provides a bipolar lug plate grid for a lead-acid storage battery, as shown in fig. 1, the plate grid comprises a frame 1 and a lug, wherein the frame 1 comprises an upper frame, a lower frame, a left frame and a right frame; the tabs include a first tab 31 and a second tab 32; along the length direction of an upper frame of the grid, a first lug 31 and a second lug 32 are symmetrically arranged on the upper frame, and the planes of the first lug 31 and the second lug 32 are parallel to the surface of the grid; ribs 4 are arranged in the frame 1, and the ribs 4 comprise a plurality of first ribs 41 transversely distributed along the surface of the pole plate and a plurality of second ribs 42 longitudinally distributed along the surface of the pole plate; each first rib 41 is in a V shape, the opening of each first rib faces the upper frame, and the included angle of the V shape is 150 degrees; the first tab 31 and the second tab 32 have the same size, and the distance d between the first tab 31 and the second tab 32, the width w of the first tab 31, and the length L of the upper frame have the following relationship: l = d +2w.

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

The second ribs 42 positioned on the perpendicular bisector of the upper frame are rectangular, and the rest of the second ribs 42 are trapezoidal with thick upper parts and thin lower parts; the first ribs 41 are distributed in a manner that the upper part is sparse and the lower part is dense, the first ribs on the upper part have the same width, the first ribs on the lower part have the same width, and the width of the first ribs on the upper part is greater than that of the first ribs on the lower part; the number of first ribs of the upper part is 5/13 of the total first ribs.

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

Example 2

The embodiment provides a grid for a lead-acid storage battery (hereinafter referred to as grid), as shown in fig. 2, the grid includes a frame 1 and tabs, the frame 1 includes an upper frame, a lower frame, a left frame and a right frame; the number of the pole lugs is 1, the pole lugs are called as unipolar lugs 2, the unipolar lugs 2 are located in the middle of the upper frame, and the plane where the unipolar lugs 2 are located is parallel to the plane of the grid. The width of the single-pole ear 2 is 5mm, the height is 10mm, the thickness of the single-pole ear 2 is slightly smaller than that of the frame 1, and the difference between the thickness of the frame 1 and the thickness of the single-pole ear 2 is 1mm. The frame 1 is internally provided with a plurality of ribs 4 which are crossed transversely and vertically, each rib 4 comprises a plurality of first ribs 41 which are distributed transversely along the polar plate direction and a plurality of second ribs 42 which are distributed longitudinally along the polar plate direction, and the first ribs 41 and the second ribs 42 are crossed vertically.

Example 3

The embodiment provides a grid for a lead-acid storage battery, as shown in fig. 3a, the grid includes a frame 1 and tabs, and the frame 1 includes an upper frame, a lower frame, a left frame and a right frame; the tabs include a first tab 31 and a second tab 32; along the length direction of the upper frame of the grid, the first pole lug 31 and the second pole lug 32 are symmetrically arranged on the upper frame, and the planes of the first pole lug 31 and the second pole lug 32 are parallel to the surface of the grid; the first tab 31 and the second tab 32 have the same size, and the widths of the first tab 31 and the second tab 32 are both 3mm. The distance between the first tab 31 and the second tab 32 is 7mm. A plurality of ribs 4 which are crossed transversely and vertically are arranged inside the frame 1, each rib 4 comprises a plurality of first ribs 41 which are distributed transversely along the polar plate direction and a plurality of second ribs 42 which are distributed longitudinally along the polar plate direction, and the first ribs 41 and the second ribs 42 are crossed vertically.

In one possible design, as shown in fig. 3b, the distance between the first tab 31 and the second tab 32 is d1, the width of the first tab 31 is w1, the length of the frame 1 is L1, and L1= d1+2w1. For example, w1 is 3mm, L1 is 66mm, d1 is 60mm.

Example 4

The embodiment provides a lead-acid storage battery, which comprises a single-cell battery, as shown in fig. 4a, the single-cell battery comprises a plurality of positive plates and negative plates which are alternately stacked, the negative plates of the lead-acid storage battery adopt the grid structure of fig. 3b of embodiment 3, the positive plates of the lead-acid storage battery adopt the grid structure of embodiment 2, the single-cell battery of the embodiment is formed by connecting 4 positive plates and 5 negative plates in parallel, a lug is a connection point of the plates, the top end of the lug of the positive plate is a positive busbar 5, the top end of the lug of the negative plate is a negative busbar 7, and the lugs of the plates in the single-cell battery are connected in parallel through the busbars. The number of the positive plates and the number of the negative plates can be 4, and the number of the positive plates and the number of the negative plates can also be 5 and 6, and the specific conditions are determined according to the capacity and the model of the battery.

The lead-acid storage battery is a lead-acid storage battery with the nominal voltage of 12V in the application, and therefore the lead-acid storage battery with the nominal voltage of 12V is formed by connecting the 6 single cells in series. The pole ear of each positive plate is connected with a positive binding post 6 through a positive busbar 5, and the pole ear of each negative plate is connected with a negative binding post 8 through a negative busbar 7. The 6 cells may be connected in series in a 1 × 6 configuration (fig. 4a, labeled 4-1 #), a 2 × 3 configuration (fig. 5, labeled 4-2 #), or a 3 × 2 configuration (fig. 6, labeled 4-3 #).

As shown in fig. 4b, in this embodiment, the positive plate of the lead-acid storage battery may adopt the grid structure of embodiment 3b, and the negative plate of the lead-acid storage battery may adopt the grid structure of embodiment 2. The 6 cells may be connected in series in a 1 × 6 configuration (fig. 4b, labeled 4-4 #), a 2 × 3 configuration (labeled 4-5 #), or a 3 × 2 configuration (labeled 4-6 #).

Example 5

The embodiment provides a lead-acid storage battery, which comprises a single-cell battery, as shown in fig. 7a and 7b, the single-cell battery comprises a plurality of positive plates and negative plates which are alternately stacked, the negative plates adopt the grid structure of fig. 3b of embodiment 3, the positive plates adopt the grid structure of embodiment 3a, the single-cell battery of the embodiment is formed by connecting 4 positive plates and 5 negative plates in parallel, the top ends of the lugs of the positive plates are positive busbars 5, the top ends of the lugs of the negative plates are negative busbars 7, and the lugs of the plates in the single-cell battery are connected in parallel through the busbars.

The lead-acid storage battery is a lead-acid storage battery with the nominal voltage of 12V in application, and therefore the lead-acid storage battery with the nominal voltage of 12V is formed by connecting the 6 single-cell batteries in series. The pole ear of each positive plate is connected with a positive binding post 6 through a positive busbar 5, and the pole ear of each negative plate is connected with a negative binding post 8 through a negative busbar 7. The 6 cells can be connected in series in a 1 × 6 configuration (fig. 7a, labeled 5-1 #), a 2 × 3 configuration (labeled 5-2 #), or a 3 × 2 configuration (fig. 9a, labeled 5-3 #).

In this example, the positive electrode plate of the cell may have the grid structure of fig. 3a of example 3, and the negative electrode plate of the cell may have the grid structure of example 2. The 6 cells may be connected in series in a 1 × 6 configuration (fig. 7b, labeled 5-4 #), a 2 × 3 configuration (fig. 8, labeled 5-5 #), or a 3 × 2 configuration (fig. 9b, labeled 5-6 #).

Example 6

The embodiment provides a lead-acid storage battery, which comprises a single-lattice battery, wherein the single-lattice battery comprises a plurality of positive plates and negative plates which are alternately stacked, the positive plates of the single-lattice battery adopt the grid structure of embodiment 1, and the negative plates of the single-lattice battery adopt the grid structure of embodiment 2. It should be noted that the lead-acid storage battery may include 6 single cells, and the way of connecting the 6 single cells in series may be a 1 × 6 structure (labeled as 6-1 #), a 2 × 3 structure, or a 3 × 2 structure.

In this embodiment, the design of the ribs and shape of the negative electrode plate may also be the same as the design of the ribs and shape of the positive electrode plate.

Example 7

The present embodiment provides a lead-acid storage battery comprising a cell including a plurality of positive plates and negative plates alternately stacked, the positive plates of the cell having the grid structure of embodiment 1, and the negative plates of the cell having the grid structure of 3a of embodiment 3. It should be noted that the lead-acid storage battery may include 6 single cells, and the way of connecting the 6 single cells in series may be a 1 × 6 structure (labeled as 7-1 #), a 2 × 3 structure, or a 3 × 2 structure.

In this embodiment, the design of the ribs and shape of the negative electrode plate may also be the same as the design of the ribs and shape of the positive electrode plate.

A 1 x 6 cell prepared from a conventional monopolar ear plate is shown in fig. 10.

The performance data for the conventional unipolar ear plate prepared cell, the 4-4# cell of example 4, the 6-1# cell of example 6, the 5-4# cell of example 5, and the 7-1# cell of example 7 are shown below for the 1,6-1# cell to perform better than the 4-4# cell and the 7-1# cell to perform better than the 5-4# cell.

It can be seen that optimizing the shape and positional distribution of the ribs of the positive plate of the present invention can further improve the performance of the battery. The second ribs on the perpendicular bisector of the upper frame of the bipolar ear plate grid for the lead-acid storage battery are rectangular, play a role of reinforcing ribs and can improve the creep resistance of the middle part of the polar plate; the rest second ribs are thick at the top and thin at the bottom, so that the corrosion resistance and the current collection effect of the upper part can be facilitated. The first ribs of the double-lug grid are V-shaped, so that the creep resistance of the grid can be improved; the first ribs are distributed in a manner of being sparse at the upper part and dense at the lower part, so that the utilization rate of active substances at the bottom of the polar plate is improved; the first ribs on the upper portion are thick, and the first ribs on the lower portion are thin, so that cost can be reduced on the premise of reducing corrosion of the ribs.

TABLE 1 Performance data for different batteries

Remarking: the improvement in active material utilization and power characteristics in the table are both compared to a battery made from a conventional monopolar ear plate.

While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

Claims (10)

1. The bipolar lug plate grid for the lead-acid storage battery is characterized by comprising a frame (1) and lugs, wherein the frame (1) comprises an upper frame, a lower frame, a left frame and a right frame; the tabs comprise a first tab (31) and a second tab (32), and the first tab (31) and the second tab (32) are symmetrically arranged on the upper frame along the length direction of the upper frame of the grid; the plane of the first pole lug (31) and the second pole lug (32) is parallel to the plane of the grid; ribs (4) are arranged in the frame (1), each rib (4) comprises a plurality of first ribs (41) which are transversely distributed along the surface of the polar plate and a plurality of second ribs (42) which are longitudinally distributed along the surface of the polar plate, each first rib (41) is V-shaped, and an opening of each first rib faces the upper frame;

the first tab (31) and the second tab (32) are the same in size, and the distance d between the first tab (31) and the second tab (32) is related to the width w of the first tab (31) and the length L of the upper frame as follows: l is more than or equal to d +2w.

2. The bipolar lug plate grid for a lead-acid battery according to claim 1,

the second ribs (42) positioned on the perpendicular bisector of the upper frame are rectangular, and the rest second ribs (42) have the shapes: the width of the second ribs (42) decreases in a direction away from the upper frame.

3. The bipolar lug plate grid for lead-acid batteries according to claim 1, characterized in that said second ribs (42) have a trapezoidal shape.

4. The grid according to claim 1, characterized in that said first ribs (41) are distributed: the distance between two adjacent first ribs (41) is not completely the same along the direction far away from the upper frame.

5. The bipolar lug plate grid for a lead-acid battery according to claim 1, wherein the included angle of the V shape is 90 ° or more and less than 180 °.

6. The bipolar lug plate grid for lead-acid batteries according to claim 1, characterized in that the width of said first ribs (41) is not exactly the same.

7. The bipolar lug plate grid for lead-acid batteries according to claim 3, characterized in that the difference between the length of the upper edge and the length of the lower edge of the second ribs (42) is 0.6 to 1.5mm.

8. The bipolar lug plate grid for lead-acid batteries according to claim 4, characterized in that the distance between two adjacent first ribs (41) is between 10 and 2mm.

9. The bipolar plate grid for lead-acid storage battery of claim 6, wherein the first ribs of the upper portion have the same width, the first ribs of the lower portion have the same width, and the first ribs of the upper portion have a width greater than that of the first ribs of the lower portion in a direction away from the upper frame; the number of the first ribs of the upper part accounts for 1/4-1/2 of the total first ribs.

10. The bipolar lug plate grid for lead-acid batteries according to claims 1 to 9, characterized in that the thickness of said first and second lugs (31, 32) is less than the thickness of the frame (1).

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