CN215496997U

CN215496997U - Bipolar ear plate grid lead-acid storage battery

Info

Publication number: CN215496997U
Application number: CN202121541646.2U
Authority: CN
Inventors: 黄伟国; 陈理; 王鹏伟; 刘孝伟
Original assignee: Chaowei Power Group Co Ltd
Current assignee: Chaowei Power Group Co Ltd
Priority date: 2021-07-07
Filing date: 2021-07-07
Publication date: 2022-01-11
Anticipated expiration: 2031-07-07

Abstract

The utility model relates to a bipolar ear plate grid lead-acid storage battery, belongs to the technical field of lead storage batteries, and is used for solving the problems of uneven current distribution inside a polar plate of the conventional lead storage battery and short cycle life of the battery. The lead-acid storage battery comprises a single-lattice battery, wherein the single-lattice battery comprises a plurality of positive plates and a plurality of negative plates which are alternately stacked; each positive plate and each negative plate respectively comprise a frame and a lug, and the frame comprises an upper frame, a lower frame, a left frame and a right frame; the tabs of each positive plate and each negative plate respectively comprise a first tab and a second tab, and the first tabs and the second tabs are symmetrically arranged on the upper frame along the length direction of the upper frame; the planes of the first lug and the second lug are parallel to the surface of the plate; in the positive plate, the distance between the first lug and the second lug is d 1; in the negative plate, the distance between the first tab and the second tab is d2, and d1 is different from d 2. The bipolar ear plate grid lead-acid storage battery has long service life.

Description

Bipolar ear plate grid lead-acid storage battery

Technical Field

The utility model relates to the field of lead-acid storage batteries, in particular to a bipolar lug plate grid 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 materials are rich in sources, low in price and renewable and recyclable. 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 to be easy to forge, and the grid surface has good contact and mechanical requirements with the active material directly, and meanwhile, the current is uniformly distributed in the whole polar plate, and the ohmic voltage drop is minimum. At present, a storage battery grid in the market is generally a single-pole lug grid, positive and negative grid lugs are arranged on one side of the grid, and the battery with the design can cause uneven utilization rate of active substances on the upper part and the lower part of a polar plate and cause concentration difference of upper electrolyte and lower electrolyte, thereby seriously influencing the service life of the battery. 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, the two tabs are respectively located on the upper frame and the lower frame of the grid and are 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, the cycle life of the battery is short or the manufacturing process is complex.

SUMMERY OF THE UTILITY MODEL

In view of the above analysis, embodiments of the present invention aim to provide a bipolar lug plate grid lead-acid battery capable of solving at least one of the following problems: (1) the current distribution in the electrode plate of the existing lead-acid storage battery is not uniform, the ohmic voltage drop is large, and the cycle life of the battery is short; (2) the existing lead-acid storage battery has complex manufacturing process.

The utility model provides a bipolar lug plate grid lead-acid storage battery which comprises a single-lattice battery, wherein the single-lattice battery comprises a plurality of positive plates and a plurality of negative plates which are alternately stacked; each positive plate and each negative plate respectively comprise a frame and a lug, and the frame comprises an upper frame, a lower frame, a left frame and a right frame;

the tabs of each positive plate and each negative plate respectively comprise a first tab and a second tab, and the first tabs and the second tabs are symmetrically arranged on the upper frame along the length direction of the upper frame; the planes of the first lug and the second lug are parallel to the surface of the plate; in the positive plate, the distance between the first lug and the second lug is d 1; in the negative plate, the distance between the first tab and the second tab is d2, and d1 is different from d 2.

Furthermore, the length of the upper frame is L1, and L1 is more than or equal to d1 and more than d 2.

Furthermore, the length of the upper frame is L1, and L1 is more than or equal to d2 and more than d 1.

Furthermore, in the positive plate of the single-cell battery, a first positive electrode bus bar is arranged at the top end of the first lug, and the first positive electrode bus bar connects the first lugs of the positive plates together in parallel; the top end of the second lug is provided with a second positive electrode bus bar which connects the second lugs of the plurality of positive plates in parallel;

in the negative plates of the single-lattice battery, a first negative busbar is arranged at the top end of a first tab, and the first tabs of the negative plates are connected in parallel by the first negative busbar; the top end of the second lug is provided with a second negative electrode bus bar which connects the second lugs of the negative plates together in parallel.

Furthermore, a plurality of ribs are arranged in the frame.

Furthermore, in the negative plate, the ribs comprise a plurality of first ribs transversely distributed along the plate surface and a plurality of second ribs longitudinally distributed along the plate surface, and the first ribs and the second ribs are vertically intersected.

Further, in the positive plate, the rib includes many first ribs and many second ribs that longitudinally distribute along the utmost point face that transversely distribute along the utmost point face, first rib and second rib intersect perpendicularly.

Furthermore, in the positive plate, the ribs comprise a plurality of first ribs transversely distributed along the surface of the plate and a plurality of second ribs longitudinally distributed along the surface of the plate; the second rib that is located on 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.

Furthermore, in the positive plate, the first ribs are all in a V shape, and the openings of the first ribs face the upper frame.

Furthermore, in the positive plate, the first ribs are distributed in a manner of being sparse at the top and dense at the bottom.

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

(1) according to the lead-acid storage battery provided by the utility model, the lug structures are optimized, the positive plate and the negative plate both adopt the bipolar lug structures, the two lugs are symmetrically positioned at the left side and the right side of the upper frame, the current distribution of the whole pole plate surface is uniform, 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 positive and negative electrode plates of the lead-acid storage battery adopt a bipolar lug structure, and the bipolar lug of the negative electrode plate further improves the power characteristic, so that the current distribution of the electrode plate is more uniform in the charge and discharge processes; and the positions of the lugs of the positive and negative polar plates are different, which is beneficial to welding the bus bar, and the manufacturing process is simple and is suitable for large-scale production and manufacturing.

(3) The positive plate of the lead-acid storage battery adopts a double-lug structure, and the second ribs on the perpendicular bisector of the upper frame in the double-lug grid are rectangular, so that the function of reinforcing ribs is achieved, and the creep resistance of the middle part of the positive plate can be improved; 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.

(4) In the positive plate of the lead-acid storage battery, the first ribs 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.

(5) The thickness of the negative plate of the lead-acid storage battery is smaller than that of the positive plate, the number of the ribs of the negative plate is smaller than that of the ribs of the positive plate, the production cost can be reduced on the basis of ensuring the performance of the battery, and the economic benefit is obvious.

In the utility model, the technical schemes can be combined with each other to realize more preferable combination schemes. Additional features and advantages of the utility model 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 utility model. The objectives and other advantages of the utility model 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 utility model, wherein like reference numerals are used to designate like parts throughout.

Fig. 1 is a schematic structural view of a unipolar lug grid of example 1;

fig. 2 is a schematic structural diagram of a double-tab grid of embodiment 2;

fig. 3a is a schematic structural diagram of a double-tab grid of example 3;

fig. 3b is another schematic structural diagram of a double-tab grid of example 3;

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

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

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

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

FIG. 11 is a schematic of the cycling performance of the cell;

fig. 12a is a graph one comparing the temperature distribution of a battery made with a conventional monopolar ear plate in accordance with an embodiment of the present invention;

fig. 12b is a graph two comparing the temperature distribution of a battery made with a conventional monopolar ear plate in accordance with an embodiment of the present invention;

FIG. 13 is a schematic diagram of the cycle performance of 5-1# and 4-4# batteries of the present invention;

FIG. 14 is a graph comparing the temperature distribution of 5-1# and 4-4# batteries according to the present invention.

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 utility model serve to explain the principles of the utility model 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 study several typical grid structures and batteries, and compare the performances of the batteries to obtain lead-acid storage batteries with excellent performances.

The utility model provides a bipolar lug plate grid lead-acid storage battery which comprises a single-lattice battery, wherein the single-lattice battery comprises a plurality of positive plates and a plurality of negative plates which are alternately stacked; each positive plate and each negative plate respectively comprise a frame 1 and a lug, and the frame 1 comprises an upper frame, a lower frame, a left frame and a right frame; the tabs of each positive plate and each negative plate respectively 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; the plane of the first tab 31 and the second tab 32 is parallel to the surface of the plate; in the positive plate, the distance between the first tab 31 and the second tab 32 is d 1; in the negative plate, the distance between the first tab 31 and the second tab 32 is d2, and d1 is different from d 2; in the positive plate, the first tab 32 and the second tab 32 are the same size.

Specifically, in the negative electrode plate, the first tab 31 and the second tab 32 have the same size.

Compared with the prior art, the positive plate and the negative plate of the lead-acid storage battery provided by the utility model both adopt the double-lug plate grids, the lugs of the double-lug plate grids are symmetrically positioned on the left side and the right side of the upper frame by optimizing the lug structures, 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.

Specifically, the length of the upper frame is L1, and L1 is more than or equal to d1 and more than d 2.

Specifically, in the single-cell battery, the top ends of the lugs of the positive plates are provided with a positive electrode bus bar 5, the top ends of the lugs of the negative plates are provided with a negative electrode bus bar 7, and the lugs of the electrode plates in the single-cell battery are connected in parallel through the bus bars; the tabs of the positive plates are connected with a positive terminal 6 through a positive busbar 5, and the tabs of the negative plates are connected with a negative terminal 8 through a negative busbar 7.

Specifically, in the positive plate of the single-cell battery, the top end of the first tab is provided with a first positive electrode bus bar, and the first positive electrode bus bar connects the first tabs of the plurality of positive plates in parallel; the top end of the second lug is provided with a second positive electrode bus bar which connects the second lugs of the plurality of positive plates in parallel; in the negative plate of the single-lattice battery, a first negative busbar is arranged at the top end of a first tab, and the first tabs of the negative plates are connected in parallel by the first negative busbar; the top end of the second lug is provided with a second negative bus bar which connects the second lugs of the plurality of negative plates in parallel; the first pole ear of each positive plate is connected with the positive wiring column 6 through a first positive bus bar, and the second pole ear of each positive plate is connected with the positive wiring column 6 through a second positive bus bar; the first electrode lug of each negative plate is connected with the negative terminal 8 through the first negative busbar, and the second electrode lug of each negative plate is connected with the negative terminal 8 through the second negative busbar.

Specifically, among the cell, including a plurality of crossband 4 that intersect in the frame of negative plate, the rib 4 includes a plurality of first ribs 41 along the horizontal distribution of polar plate face and a plurality of second ribs 42 along the vertical distribution of polar plate face, and first rib 41 and second rib 42 intersect perpendicularly.

Specifically, in the single-lattice battery, the frame of the positive plate includes a plurality of ribs 4 that intersect vertically and horizontally, the ribs 4 include a plurality of first ribs 41 that distribute along the horizontal direction of the plate surface and a plurality of second ribs 42 that distribute along the vertical direction of the plate surface, and the first ribs 41 and the second ribs 42 intersect perpendicularly.

Preferably, as shown in fig. 3b, in the positive plate, the ribs 4 comprise a plurality of first ribs 41 distributed along the transverse direction of the plate surface and a plurality of second ribs 42 distributed along the longitudinal direction of the plate surface; the second ribs 42 positioned on the perpendicular bisector of the upper frame are rectangular, so that the function of reinforcing ribs is achieved, and the creep resistance of the middle part of the polar plate can be improved (once the polar plate grows in a creep mode, the polar plate can be pushed onto the busbar, and short circuit failure can occur); 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, in the positive plate, 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.

Preferably, in the positive plate, each first rib 41 is in a V-shape, the opening faces the upper frame, and the creep resistance of the grid can be improved by the V-shape of the first rib 41. Illustratively, the included angle of the V-shape is 90 ° or more and less than 180 °.

Specifically, in the positive electrode plate, 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.

Preferably, in the positive plate, 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. Illustratively, the distance between two adjacent first ribs 41 is 10-2 mm.

In view of the fact that the ribs are more corroded due to the more severe reaction at the upper portion of the plate, and thus, in order to reduce the cost while reducing the corrosion of the ribs, it is preferable that the width of the first ribs 41 is not exactly the same in the positive plate.

In one possible design, in the positive plate, along the direction 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; illustratively, the number of first ribs of the upper portion is 1/4-1/2 of the total first ribs.

In one possible design, in the positive electrode plate, the width of the first ribs gradually decreases in a direction away from the upper frame.

Specifically, in the positive and negative electrode plates, the first and

second tabs

31 and 32 are sized according to a specific battery model.

Specifically, in the positive plate and the negative plate, the thickness of the first tab 31 and the second tab 32 is slightly less than the thickness of the frame 1, and the difference between the thickness of the frame 1 and the thickness of the first tab 31 and the second tab 32 is 0.5-3 mm.

In consideration of the high utilization rate of the positive electrode plate in the use of the lead-acid storage battery, the negative electrode plate may be formed to have a thickness smaller than that of the positive electrode plate, and the negative electrode plate may have a number of ribs smaller than that of the positive electrode plate, in order to reduce the cost. So set up, can be under the prerequisite of guaranteeing the battery performance reduction in production cost, economic benefits is showing.

Specifically, the thickness of the negative plate can be 70% -95% of that of the positive plate, and the number of the ribs of the negative plate can be 70% -95% of that of the positive plate.

In the cell, the design of the ribs and the shape of the negative electrode plate may be the same as those of the positive electrode plate. Specifically, the lead-acid storage battery can comprise 1 or more single batteries, the nominal voltage of each single battery is 2.0V, the single battery can be discharged to 1.7V and can be charged to 2.5V, and in application, 6 single batteries can be connected in series to form the lead-acid storage battery with the nominal voltage of 12V. A plurality of single cells can also be connected in series to form lead-acid storage batteries with the nominal values of 24V, 36V, 48V and the like.

The lead-acid storage battery can be used as 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 is different from a battery for starting an automobile, and the battery for starting the automobile needs instantaneous large current output capacity, so in the aspect of rib distribution of the positive plate, the internal resistance of the ribs is the lowest as a main design principle, radial rib distribution is generally adopted, and as the discharge time is extremely short, the interaction influence generated by ion migration between the positive electrode and the negative electrode in the discharge process can be small, and the relative position influence of the positive electrode and the negative electrode is small.

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.

Compared with the prior art, the lugs of the double-lug plate grid adopted by the double-lug plate grid lead-acid storage battery 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. The grid of the lead-acid storage battery is simple in structure and manufacturing process, and is suitable for large-scale production and manufacturing.

The lead-acid storage battery adopts a structure that the positive plate and the negative plate are both double-lug grids, and the double lugs of the negative plate further improve the power characteristic, so that the current distribution of the positive plate is more uniform in the charging and discharging process; the positions of the lugs of the positive and negative polar plates are different, which is beneficial to welding the bus bar, and the manufacturing process is simple and suitable for large-scale production.

In the positive plate of the lead-acid storage battery, the second ribs on the perpendicular bisector of the upper frame are rectangular, so that the function of reinforcing ribs is achieved, and the creep resistance of the middle part of the positive plate can be improved; 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.

In the positive plate of the lead-acid storage battery, the first ribs 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.

The thickness of the negative plate of the lead-acid storage battery is smaller than that of the positive plate, the number of the ribs of the negative plate is smaller than that of the ribs of the positive plate, the production cost can be reduced on the basis of ensuring the performance of the battery, and the economic benefit is obvious.

Example 1

The embodiment provides a grid (hereinafter referred to as grid) for a lead-acid storage battery, as shown in fig. 1, 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 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 1 mm.

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 2

The embodiment provides a grid for a lead-acid storage battery, as shown in fig. 2, 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 lug 31 and the 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; 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 3 mm. The distance between the first tab 31 and the second tab 32 is 7 mm. 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, a first lug 31 and a second lug 32 are symmetrically arranged on the outer side of the upper frame, and the planes of the first lug 31 and the second lug 32 are parallel to the surface of the grid; the distance between the first tab 31 and the second tab 32 is d3, the width of the first tab 31 is w2, and the length of the frame 1 is L, where L is d3+2w 2. For example, w2 is 3mm, L is 66mm, and d3 is 60 mm. Still set up many ribs 4 in the frame 1, rib 4 includes many first ribs 41 along the horizontal distribution of polar plate face and many second ribs 42 along the vertical distribution of polar plate face, and first rib 41 and second rib 42 intersect perpendicularly.

As shown in fig. 3b, in a possible design, a plurality of ribs 4 are further disposed in the frame 1, and the ribs 4 include a plurality of first ribs 41 distributed along the transverse direction of the pole plate surface and a plurality of second ribs 42 distributed along the longitudinal direction of the pole plate surface; the second ribs 42 on the perpendicular bisector of the upper frame are rectangular and play a role of reinforcing ribs, and the rest of the second ribs 42 are trapezoidal with thick upper parts and thin lower parts; each first rib 41 is in a V shape, and the included angle of the V shape is 150 °. The first ribs 41 are distributed in a manner that the upper part is sparse and the lower part is dense, the widths of the first ribs on the upper part are the same, the widths of the first ribs on the lower part are the same, and the widths of the first ribs on the upper part are larger than those of the first ribs on the lower part; the number of first ribs of the upper portion is 5/13 of the total first ribs.

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. 3a of embodiment 3, the positive plates of the lead-acid storage battery adopt the grid structure of embodiment 1, the single cell battery of the embodiment is formed by connecting 4 positive plates and 5 negative plates in parallel, the lugs are connection points of the plates, namely, each plate is to lead out or input current through respective lugs, the top ends of the lugs of the positive plates are positive bus bars 5, the top ends of the lugs of the negative plates are negative bus bars 7, and the lugs of the plates in the single cell battery are connected in parallel through the bus bars. 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 tabs of the positive plates are connected with a positive terminal 6 through a positive busbar 5, and the tabs of the negative plates are connected with a negative terminal 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 battery may adopt the grid structure of embodiment 3, and the negative plate of the lead-acid battery may adopt the grid structure of embodiment 1. 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 bipolar lug plate grid 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 plate grid structure of fig. 3a of embodiment 3, the positive plates adopt the plate 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, lugs are connection points of the plates, namely each plate is led out or input with current through respective lugs, the top ends of the lugs of the positive plates are positive bus bars 5, the top ends of the lugs of the negative plates are negative bus bars 7, and the lugs of the plates in the single-cell battery are connected in parallel through the bus bars.

Specifically, in the positive plate of the single-cell battery, the top end of the first tab is provided with a first positive electrode bus bar, and the first positive electrode bus bar connects the first tabs of the plurality of positive plates in parallel; the top end of the second lug is provided with a second positive electrode bus bar which connects the second lugs of the plurality of positive plates in parallel; in the negative plate of the single-lattice battery, a first negative busbar is arranged at the top end of a first tab, and the first tabs of the negative plates are connected in parallel by the first negative busbar; the top end of the second lug is provided with a second negative bus bar which connects the second lugs of the plurality of negative plates in parallel; the first pole ear of each positive plate is connected with the positive wiring column through a first positive bus bar, and the second pole ear of each positive plate is connected with the positive wiring column through a second positive bus bar; the first electrode lug of each negative plate is connected with the negative binding post through the first negative busbar, and the second electrode lug of each negative plate is connected with the negative binding post through the second negative busbar.

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 tabs of the positive plates are connected with a positive terminal 6 through a positive busbar 5, and the tabs of the negative plates are connected with a negative terminal 8 through a negative busbar 7. The 6 cells may 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 present embodiment provides a lead-acid storage battery comprising a cell comprising a plurality of positive and negative plates alternately stacked, the positive plates of the cell employing the grid structure of fig. 3b of embodiment 3 and the negative plates of the cell employing the grid structure of embodiment 1. 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 bipolar lug plate grid lead-acid battery comprising a cell comprising a plurality of positive plates and negative plates alternately stacked, the positive plates of the cell employing the grid structure of fig. 3b of embodiment 3 and the negative plates of the cell employing 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 7-1#), a 2 × 3 structure, or a 3 × 2 structure.

Fig. 11 is a schematic diagram showing the cycle performance of the battery, wherein # 1 is a 1 × 6 battery prepared by the conventional monopolar ear plate (as shown in fig. 10), and # 2 is a 1 × 6 battery structure of 4-4. The others are kept consistent and cycled, and it can be seen from the above figure that the 4-5# batteries of the present invention cycle better than conventional monopolar ear batteries.

Fig. 12a and 12b are schematic diagrams showing the temperature distribution of the battery, wherein in fig. 12a, the left diagram is a schematic diagram showing the results of the battery prepared by the traditional unipolar ear plate, and the right diagram is a schematic diagram showing the results of the 5-1# battery; in fig. 12b, the left graph is a graph showing the results of a battery prepared from a conventional monopolar ear plate, and the right graph is a graph showing the results of a 4-4# battery. The temperature distribution in the figure is analyzed, and compared with the battery prepared by the traditional unipolar ear plate, the battery provided by the utility model has the advantages that the plate surface current distribution is uniform, the generated heat is less, the temperature distribution uniformity is good, and the improvement of the battery cycle performance is facilitated.

As shown in fig. 13, the cycle performance of the battery is schematically shown, in which a is a 5-1# battery structure (as shown in fig. 7 a) in which the positive and negative plates are both double-lug, B is a 1 × 6 battery structure in which the positive plate is double-lug and the negative plate is 4-4# single-lug (as shown in fig. 4B). The others are kept consistent and the cycle is performed. From the above figures, it can be seen that the a battery of the present invention (the positive and negative plates are both of a double-tab battery structure) has a higher discharge capacity and a higher cycle number. Therefore, the cycle performance of the battery with the positive plate and the negative plate both having double lugs is superior to that of the battery with the positive plate and the negative plate, wherein one of the positive plate and the negative plate is a bipolar lug, and the other one of the positive plate and the negative plate is a unipolar lug.

Fig. 14 is a schematic diagram showing the temperature distribution of the battery, in fig. 14, the left diagram is a schematic diagram showing the results of the B battery, and the right diagram is a schematic diagram showing the results of the a battery; the temperature distribution in the graph is analyzed, under the condition that the same current and other conditions are kept consistent, the temperature of the battery A is slightly lower than that of the battery B, the current on the plate surface of the battery A is uniformly distributed, the generated heat is less, the temperature distribution uniformity is good, and the improvement of the cycle performance of the battery is facilitated.

The performance data for the batteries prepared from the conventional monopolar ear 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 shown in table 1 below, and it can be seen that the performance of the batteries of the present invention is significantly better than the batteries prepared from the conventional monopolar ear plates. The 5-4# battery of the utility model has better performance than the 4-4# battery, the 7-1# battery has better performance than the 6-1# battery, the 6-1# battery has better performance than the 4-4# battery, and the 7-1# battery has better performance than the 5-4# battery. Therefore, the cycle performance of the battery with the positive plate and the negative plate both having double lugs is superior to that of the battery with the positive plate and the negative plate, wherein one of the positive plate and the negative plate is a bipolar lug and the other is a unipolar lug; the bipolar tab of the negative plate further improves the power characteristics. In the present invention, the battery performance can be further improved by optimizing the shape and the positional distribution of the ribs of the positive electrode plate. Specifically, in the positive plate, the second ribs on the perpendicular bisector of the upper frame are rectangular, so that the function of reinforcing ribs is achieved, and the creep resistance of the middle part of the positive plate can be improved; 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. In the positive plate, the first ribs 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.

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.

In order to reduce the cost, the inventor reduces the thickness of the negative plate of the 5-1# battery structure by 10%, reduces the number of ribs by 6%, and reduces the cycle performance of the battery by 15% or more, which is equivalent to the performance of the 5-1# battery.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims

1. A bipolar lug plate grid lead-acid storage battery, characterized in that the lead-acid storage battery comprises a single-lattice battery, and the single-lattice battery comprises a plurality of positive plates and a plurality of negative plates which are alternately stacked; each positive plate and each negative plate respectively comprise a frame (1) and a lug, and the frame (1) comprises an upper frame, a lower frame, a left frame and a right frame;

the tabs of each positive plate and each negative plate respectively 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; the plane of the first tab (31) and the plane of the second tab (32) are parallel to the surface of the plate; in the positive plate, the distance between the first tab (31) and the second tab (32) is d 1; in the negative plate, the distance between the first tab (31) and the second tab (32) is d2, and d1 is different from d 2.

2. The lead-acid storage battery of claim 1, wherein the length of the upper frame is L1, and L1 is more than or equal to d1 and more than d 2.

3. The lead-acid storage battery of claim 1, wherein the length of the upper frame is L1, and L1 is more than or equal to d2 and more than d 1.

4. The lead-acid battery of claim 1, wherein the positive plates of the cells are terminated with first tabs terminating in first positive straps connecting the plurality of positive plate first tabs together in parallel; the top end of the second lug is provided with a second positive electrode bus bar which connects the second lugs of the plurality of positive plates in parallel;

5. Lead-acid battery according to claim 1, characterized in that a plurality of ribs (4) are also provided in the frame (1).

6. The lead-acid storage battery of claim 5, wherein in the negative plate, the ribs include a plurality of first ribs distributed laterally along the plate surface and a plurality of second ribs distributed longitudinally along the plate surface, and the first and second ribs intersect perpendicularly.

7. The lead-acid battery of claim 6, wherein the ribs in the positive plate comprise a plurality of first ribs distributed transversely along the plate surface and a plurality of second ribs distributed longitudinally along the plate surface, the first and second ribs intersecting perpendicularly.

8. The lead-acid battery of claim 6, wherein in the positive plate, the ribs comprise a plurality of first ribs distributed transversely along the plate surface and a plurality of second ribs distributed longitudinally along the plate surface; the second rib that is located on 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.

9. The lead-acid battery according to claim 8, wherein in the positive plate, the first ribs are all V-shaped, and the openings face the upper frame.

10. The lead-acid battery of claim 8, wherein the distribution of the first ribs in the positive plate is open on top and close on bottom.