Pole plate, pole group structure and lead-acid battery

Abstract

The utility model relates to the technical field of batteries, in particular to a polar plate, a polar group structure and a lead-acid battery. The polar plate provided by the utility model comprises a grid, a top tab and a bottom tab, the grid comprises a rectangular frame, a plurality of transverse ribs and a plurality of first vertical ribs are arranged in the rectangular frame, and the rectangular frame is provided with a first side edge and a second side edge which are opposite to each other along a first direction. According to the utility model, the current density of the lower part of the polar plate can be improved through the arranged bottom tab, and the distance between every two adjacent transverse ribs is gradually reduced from the first side edge to the middle part of the grid and from the second side edge to the middle part of the grid, so that the contact area between active substances in the middle of the polar plate and the middle part of the grid can be increased; therefore, the utilization rate of active substances in the middle of the polar plate is improved, and the service life of the battery is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, concretely relates to a polar plate, polar group structure and lead acid battery. BACKGROUND

[0002] The lead acid battery is composed of positive plates, negative plates, separators, electrolyte, battery cases, connecting pieces, pole posts and the like. Among them, the positive and negative plates are the core components of the lead acid battery, and the shape, number and distribution mode of the horizontal and vertical ribs determine the capacity, service life and rate discharge characteristics of the battery.

[0003] At present, the conventional polar plate is composed of a grid, active material (formed by lead paste after a specific process) coated on the grid and one tab provided at the top of the grid, like Figure 7 Each two adjacent horizontal ribs and each two adjacent vertical ribs in the grid are provided at equal intervals.

[0004] With the above polar plate, there are usually problems such as larger current density at the upper part of the polar plate, higher utilization rate of active material, smaller current density at the middle and lower parts, and lower utilization rate of active material during charging and discharging, which leads to shorter cycle life of the lead acid battery. SUMMARY

[0005] (I) The problem to be solved by the utility model is how to improve the utilization rate of active material in the polar plate.

[0006] (II) TECHNICAL SOLUTION

[0007] The utility model provides a polar plate, including grid, top tab and bottom tab;

[0008] The grid includes a rectangular frame, a plurality of horizontal ribs and a plurality of first vertical ribs are arranged in the rectangular frame, and the rectangular frame has opposite first and second sides in the first direction;

[0009] The top tab is arranged on the first side, and the bottom tab is arranged on the second side, and the top tab and the bottom tab are symmetrically arranged;

[0010] The plurality of horizontal ribs and the plurality of first vertical ribs are connected to form a grid structure;

[0011] The distance between each two adjacent horizontal ribs gradually decreases from the first side to the middle of the grid and from the second side to the middle of the grid.

[0012] According to one embodiment of the utility model, the grid also has opposite third and fourth sides in the second direction;

[0013] The first side is perpendicular to the third side.

[0014] The first direction is perpendicular to the second direction.

[0015] According to one embodiment of the present application, the distance from the top tab to the third side is less than the distance from the top tab to the fourth side, and the distance from the top tab to the third side is equal to the distance from the bottom tab to the third side.

[0016] The distance between every two adjacent first vertical ribs in the grid structure decreases in turn in the direction from the third side to the fourth side.

[0017] According to one embodiment of the present application, the grid structure has a first coating area and a second coating area, a plurality of second vertical ribs are arranged in the first coating area and the second coating area, the plurality of second vertical ribs have the same length, and the second vertical rib is arranged between every two adjacent first vertical ribs.

[0018] According to one embodiment of the present application, the distance from the top tab to the third side is equal to the distance from the bottom tab to the fourth side.

[0019] The grid structure has a third coating area and a fourth coating area, a plurality of third vertical ribs are arranged in the third coating area, the length of the plurality of third vertical ribs increases in turn in the direction from the third side to the fourth side, and one end of each third vertical rib is connected with the first side.

[0020] A plurality of fourth vertical ribs are arranged in the fourth coating area, the length of the plurality of fourth vertical ribs increases in turn in the direction from the fourth side to the third side, and one end of each fourth vertical rib is connected with the second side.

[0021] A pole group structure comprising any one of the pole plates;

[0022] The pole plate comprises a positive pole plate and a negative pole plate, a plurality of the positive pole plates and a plurality of the negative pole plates are arranged, the plurality of positive pole plates and the plurality of negative pole plates are arranged alternately, and a U-shaped partition plate is arranged on each positive pole plate.

[0023] According to one embodiment of the present application, the top bus bar and the bottom bus bar are further included.

[0024] The top tab of each positive pole plate and the top tab of each negative pole plate are connected with the top bus bar.

[0025] The bottom tab of each positive pole plate and the bottom tab of each negative pole plate are connected with the bottom bus bar.

[0026] According to one embodiment of the utility model, the positive terminal of top busbar is connected with the positive terminal of bottom busbar through first connecting line.

[0027] The negative terminal of top busbar is connected with the negative terminal of bottom busbar through second connecting line.

[0028] A lead-acid battery comprises the pole group structure of any one of the preceding claims, wherein the pole group structure is provided with six groups in the second direction, and the pole group structure is provided with two groups in the third direction.

[0029] The pole group structure is provided with three groups in the third direction.

[0030] The first direction, the second direction and the third direction are perpendicular to each other.

[0031] According to one embodiment of the utility model, the battery shell is provided with a top cover, a shell and a bottom cover connected in sequence.

[0032] The shell is provided with a placing cavity for placing the pole group structure.

[0033] The utility model discloses beneficial effects:

[0034] The bottom tab can improve the current density of the lower part of the pole plate, and the distance between every two adjacent horizontal ribs gradually decreases from the first side edge to the middle part of the grid and from the second side edge to the middle part of the grid, which can improve the contact area between the active material in the middle part of the pole plate and the middle part of the grid, reduce the resistivity of the middle part of the pole plate, improve the current density of the middle part of the pole plate, and further improve the utilization rate of the active material in the middle part of the pole plate, thereby prolonging the service life of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0036] Figure 1 The front view of the pole plate (active material not shown) provided in the first embodiment of the utility model;

[0037] Figure 2 The front view of the pole plate (active material not shown) provided in the second embodiment of the utility model;

[0038] Figure 3 The three-dimensional explosion view of the lead-acid battery provided in the third embodiment of the utility model;

[0039] Figure 4 A perspective view of the pole group structure and the bottom cover provided in the third embodiment of the present application;

[0040] Figure 5 A perspective view of the pole group structure and the bottom cover provided in the third embodiment of the present application;

[0041] Figure 6 A comparison diagram of the cycle life of the battery composed of the existing grid and the cycle life of the battery composed of the grid provided in the first embodiment and the second embodiment;

[0042] Figure 7 A perspective view of the grid in the prior art provided in the third embodiment of the present application.

[0043] Icon: 1, grid; 101, horizontal rib; 102, first vertical rib; 103, first side; 104, second side; 105, third side; 106, fourth side; 107, second vertical rib; 108, third vertical rib; 109, fourth vertical rib; 2, top tab; 3, bottom tab; 4, top busbar; 5, bottom busbar; 6, top cover; 7, shell; 701, placement cavity; 8, bottom cover; 9, first connecting line; 10, second connecting line. DETAILED DESCRIPTION

[0044] The technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0045] Embodiment one:

[0046] As shown in the drawings, one embodiment of the present application provides a pole plate, comprising a grid 1, a top tab 2 and a bottom tab 3; Figure 1

[0047] The grid 1 comprises a rectangular frame, a plurality of horizontal ribs 101 and a plurality of first vertical ribs 102 are arranged in the rectangular frame, and the rectangular frame has opposite first and second sides 103 and 104 in the first direction;

[0048] The first side 103 is provided with the top tab 2, and the second side 104 is provided with the bottom tab 3, and the top tab 2 and the bottom tab 3 are symmetrically arranged;

[0049] The plurality of horizontal ribs 101 and the plurality of first vertical ribs 102 are connected to each other to form a grid structure;

[0050] ​The distance between every two adjacent horizontal ribs 101 gradually decreases from the first side edge 103 to the middle of the grid 1 and from the second side edge 104 to the middle of the grid 1.

[0051] In the embodiment, the plate is composed of the grid 1, the top tab 2, the bottom tab 3 and the active material coated on the grid 1 (not shown in the active material diagram), which is formed through a series of processes such as coating, curing and formation of lead paste, and the active material is coated with positive active material when the plate is made into a positive plate and with negative active material when the plate is made into a negative plate.

[0052] The bottom tab 3 can improve the current density of the lower part of the plate, and the gradually decreasing distance between every two adjacent horizontal ribs 101 from the first side edge 103 to the middle of the grid 1 and from the second side edge 104 to the middle of the grid 1 can improve the contact area between the active material in the middle of the plate and the middle of the grid 1, reduce the resistivity of the middle of the plate, improve the current density of the middle of the plate, and further improve the utilization rate of the active material in the middle and lower part of the plate and prolong the service life of the battery.

[0053] In the embodiment, the top tab 2 is located at the upper part of the grid 1, and the bottom tab 3 is located at the lower part of the grid 1.

[0054] Preferably, the distance between every two adjacent horizontal ribs 101 gradually decreases by 0.05-0.1% from the first side edge 103 to the middle of the grid 1, stops at the most central horizontal rib 101 in the middle of the grid 1, and then gradually increases by 0.05-0.1% from the most central horizontal rib 101 to the second side edge 104.

[0055] According to one embodiment of the utility model, along the second direction, the grid 1 further has opposite third side edge 105 and fourth side edge 106;

[0056] The first side edge 103 is perpendicular to the third side edge 105;

[0057] The first direction is perpendicular to the second direction.

[0058] According to one embodiment of the utility model, as Figure 1 shown, the distance from the top tab 2 to the third side edge 105 is less than the distance from the top tab 2 to the fourth side edge 106, and the distance from the top tab 2 to the third side edge 105 is equal to the distance from the bottom tab 3 to the third side edge 105;

[0059] Along the direction from the third side edge 105 to the fourth side edge 106, the distance between every two adjacent first vertical ribs 102 in the grid structure gradually decreases.

[0060] Since the top tab 2 and the bottom tab 3 are both close to the third side edge 105, when the current flows on the grid 1, it is easy to directly flow from the top tab 2 to the bottom tab 3, which causes the current to be concentrated on the left half of the plate and sparse on the right half, and the current density is unevenly distributed. Therefore, when the distances from the top tab 2 and the bottom tab 3 to the third side edge 105 are equal, the distance between every two adjacent first vertical ribs 102 is sequentially reduced in the direction from the third side edge 105 to the fourth side edge 106, and the grid structure is denser when it is closer to the fourth side edge 106, which increases the contact area between the active material of the right half of the plate and the grid 1, reduces the resistance of the right half, increases the current density of the right half, and further improves the utilization rate of the active material of the right half of the plate. The left half of the grid structure refers to the part close to the third side edge 105, and the right half refers to the part close to the fourth side edge 106.

[0061] According to one embodiment of the present application, as shown in Figure 1 The grid structure has a first coating area and a second coating area, and a plurality of second vertical ribs 107 are arranged in the first coating area and the second coating area. The plurality of second vertical ribs 107 are of the same length, and a second vertical rib 107 is arranged between every two adjacent first vertical ribs 102.

[0062] In the present embodiment, the first coating area is formed by the first side edge 103 and one horizontal rib 101 closest to the first side edge 103, and the second coating area is formed by the second side edge 104 and one horizontal rib 101 closest to the second side edge 104.

[0063] By arranging a plurality of second vertical ribs 107 in the first coating area and the second coating area, the conductivity of the grid structure near the top tab 2 and the bottom tab 3 can be enhanced, the path and cross-sectional area of current transmission are increased, the transmission of current from the grid 1 to the top tab 2 or the bottom tab 3 is smoother, and due to the plurality of second vertical ribs 107, the current can flow to the top tab 2 or the bottom tab 3 through multiple paths, avoiding the situation that the local current is too large or too small, and improving the overall performance of the lead-acid battery.

[0064] Further, the distance from the second vertical rib 107 to the two adjacent first vertical ribs 102 corresponding thereto is equal.

[0065] Preferably, the distance from the first side edge 103 to one horizontal rib 101 closest to the first side edge 103 is equal to the distance from the second side edge 104 to another horizontal rib 101 closest to the second side edge 104, and at this time, the length of each second vertical rib 107 located in the first coating area and the second coating area is equal to the distance from the first side edge 103 to one horizontal rib 101 closest to the first side edge 103.

[0066] According to Figure 1The grid 1 of the positive plate (longitudinal mirror symmetry asymmetric tab) is made as follows: the distance between each adjacent two first vertical ribs 102 in the grid 1 decreases by 0.05-0.1% from the third side edge 105 to the fourth side edge 106. The distance between the leftmost first vertical rib 102 and the third side edge 105 is 11 mm, and the distance between the first vertical ribs 102 decreases by 0.69 mm from left to right (i.e. from the third side edge 105 to the fourth side edge 106);

[0067] The distance between the center horizontal ribs 101 is 4 mm, and increases by 0.69 mm upward and downward (i.e. towards the first side edge 103 and the second side edge 104) (see Figure 1 ).

[0068] The grid 1 of the negative plate is made as follows: Figure 1 The thickness of the grid 1 of the negative plate is thinner than that of the grid 1 of the positive plate, and each mesh of the grid structure in the negative plate is larger, and the rest is the same as the grid 1 of the positive plate.

[0069] Example Two:

[0070] As shown in Figure 2 , as the second kind of plate, the size of the rectangular frame of the grid 1 of the plate is the same as that in Example One, and the arrangement of the horizontal ribs 101 is the same as that in Example One, and the difference is as follows:

[0071] The distance between the top tab 2 and the third side edge 105 is equal to the distance between the bottom tab 3 and the fourth side edge 106;

[0072] The grid structure has a third coating area and a fourth coating area, the third coating area is provided with a plurality of third vertical ribs 108, and the length of the plurality of third vertical ribs 108 increases in sequence along the direction from the third side edge 105 to the fourth side edge 106, and one end of each third vertical rib 108 is connected with the first side edge 103;

[0073] The fourth coating area is provided with a plurality of fourth vertical ribs 109, and the length of the plurality of fourth vertical ribs 109 increases in sequence along the direction from the fourth side edge 106 to the third side edge 105, and one end of each fourth vertical rib 109 is connected with the second side edge 104.

[0074] In this embodiment, the third coating area and the fourth coating area are diagonally arranged on the second diagonal line (i.e. the diagonal line from the upper right corner of the grid 1 to the lower left corner) of the grid structure, and for the convenience of description, the grid structure is divided into an upper region, a middle region and a lower region, the third coating area is located in the upper region away from the top tab 2, i.e. the triangular region at the upper right corner of the grid structure, and the fourth coating area is located in the lower region away from the bottom tab 3, i.e. the triangular region at the lower left corner of the grid structure.

[0075] Adding stepped third vertical ribs 108 and fourth vertical ribs 109 in the third and fourth coating areas can increase the density of the grid structure away from the top tab 2 and bottom tab 3, thereby increasing the contact area between the active material and the grid 1 in the third and fourth coating areas, reducing the resistivity of the plate in that area, optimizing the current density distribution of the plate on the opposite side tab, improving the utilization rate of the active material, and extending the battery life.

[0076] according to Figure 2 The grid 1 of the fabricated positive electrode plate (symmetrical tabs on opposite sides of the first diagonal point, the first diagonal refers to the diagonal from the upper left corner to the lower right corner of the grid 1 plate): The central horizontal ribs 101 of the grid 1 are spaced 4mm apart, increasing by 0.69mm upwards and downwards. From the intersection of the first side 103 and the fourth side 106, the third vertical rib 108 with a stepped increasing length is used from the 0.382-th length of the first side 103 to the 0.382-th length of the fourth side 106. From the intersection of the third side 105 and the second side 104, the fourth coating area enclosed by the 0.382-th length of the third side 105 and the 0.382-th length of the second side 104 is designed with a fourth vertical rib 109 with a stepped decreasing length (see...). Figure 2 ).

[0077] according to Figure 2 The thickness of the grid 1 of the negative electrode plate is thinner than that of the grid 1 of the positive electrode plate, and each mesh of the grid structure in the negative electrode plate is larger, while the rest are the same as the grid 1 of the positive electrode plate.

[0078] Example 3:

[0079] like Figures 3-6 As shown, a lead-acid battery includes an electrode group structure, and the electrode group structure includes electrode plates.

[0080] The electrode plates include positive and negative plates, and multiple positive and negative plates are provided. The multiple positive plates and multiple negative plates are arranged alternately, and each positive plate is fitted with a U-shaped separator.

[0081] Preferably, the electrode group structure has four positive electrode plates and five negative electrode plates arranged in the order of negative electrode plate, positive electrode plate, and negative electrode plate. Both sides of each electrode group structure are negative electrode plates. A U-shaped partition is used to fit over the outside of the positive electrode plate so that the negative electrode plate is in contact with the U-shaped partition, which can prevent the positive electrode plate and the negative electrode plate from directly contacting each other.

[0082] Optionally, the electrode group structure has two positive plates and three negative plates, and there is no limit to the number of positive and negative plates in the electrode group structure.

[0083] According to one embodiment of the present invention, it further includes a top busbar 4 and a bottom busbar 5;

[0084] The top tab 2 of each positive plate and the top tab 2 of each negative plate are connected with the top busbar 4;

[0085] The bottom tab 3 of each positive plate and the bottom tab 3 of each negative plate are connected with the bottom busbar 5.

[0086] The top tab 2 of each positive plate is connected with the positive terminal of the top busbar 4, and the bottom tab 3 of each positive plate is connected with the positive terminal of the bottom busbar 5;

[0087] The top tab 2 of each negative plate is connected with the negative terminal of the top busbar 4, and the bottom tab 3 of each negative plate is connected with the negative terminal of the bottom busbar 5.

[0088] It should be noted that the top tab 2 and the bottom tab 3 of each positive plate are both positive, and the top tab 2 and the bottom tab 3 of each negative plate are both negative.

[0089] According to an embodiment of the present application, the positive terminal of the top busbar 4 is connected with the positive terminal of the bottom busbar 5 through the first connecting line 9;

[0090] The negative terminal of the top busbar 4 is connected with the negative terminal of the bottom busbar 5 through the second connecting line 10.

[0091] The first connecting line 9 and the second connecting line 10 are both metal wires, and the metal wire is pure lead or lead-tin alloy, wherein the tin content in the lead-tin alloy is not more than 5%.

[0092] According to an embodiment of the present application, the pole group structure is provided with six groups, and along the second direction, the pole group structure is provided with two groups;

[0093] Along the third direction, the pole group structure is provided with three groups;

[0094] The first direction, the second direction and the third direction are perpendicular to each other.

[0095] When the pole group structure is provided with six groups, the top busbar 4 is composed of a plurality of top sub-busbars connected in series, and the bottom busbar 5 is composed of a plurality of bottom sub-busbars connected in series.

[0096] According to an embodiment of the present application, the battery shell further comprises a top cover 6, a shell 7 and a bottom cover 8 connected in sequence;

[0097] The shell 7 is provided with a placement cavity 701 for placing the pole group structure.

[0098] According to one embodiment of the utility model, the placement cavity 701 corresponds to the pole group structure one by one, two placement cavities 701 located on both sides of the shell 7 are provided with reserved holes, one end of the first connecting wire 9 is connected with the top busbar 4, the other end passes through the corresponding reserved hole and the bottom busbar 5 and is connected,

[0099] One end of the second connecting wire 10 is connected with the top busbar 4, the other end passes through the corresponding reserved hole and the bottom busbar 5 and is connected.

[0100] In the embodiment, 2*3 pole group distribution is adopted, which can not only reduce the potential difference between the top and bottom of the pole plate, improve the utilization rate of the middle and bottom active material, but also optimize the uniform distribution of the current density on the pole plate, thereby improving the battery capacity and prolonging the cycle life.

[0101] The battery made according to the first embodiment increases one bottom busbar 5 welding step in the pole group structure, bottom cover 8 sealing step, first connecting wire 9 and second connecting wire 10 and top busbar 4 and bottom busbar 5 positive and negative terminal connection step compared with the traditional battery composed of traditional single-sided tab (such as Figure 7 ) in the assembly stage, the remaining steps are completely consistent with the existing battery.

[0102] The battery made according to the second embodiment, compared with the battery made according to the first embodiment, after the first connecting wire 9 and the second connecting wire 10 and the top busbar 4 and the bottom busbar 5 positive and negative terminal connection step are completed, the bottom non-adjacent bottom sub-busbar is connected through the wire connection step along the bottom cover 8 reserved groove, and the remaining steps are completely consistent with the first embodiment.

[0103] As shown in Figure 3 , taking the assembly of the battery made according to the second embodiment as an example: when the pole plate is packaged, the adjacent positive and negative pole plates are separated by the U-shaped separator, the positive and negative pole plates are stacked in the order of negative pole plate, positive pole plate, negative pole plate, and then are put into the placement cavity 701, the second side edge 104 in the pole plate grid 1 will not expose the placement cavity 701, which is specifically realized by the limiting structure, the limiting structure is a limiting strip connected with the shell 7, which is used to prevent the second side edge 104 of the pole plate grid 1 from exposing the placement cavity 701, and can make the bottom tab 3 protrude from the placement cavity 701. After the bottom busbar 5 is cast and welded, the bottom cover 8 is sealed, and then the first connecting wire 9 and the second connecting wire 10 connecting the positive and negative terminals of the bottom and top top busbar 4 and the bottom busbar 5 are welded together through the reserved holes on the shell 7 and the reserved grooves on the bottom cover 8, as shown in Figure 4 . When the 2*3 battery made of the pole plate of the second embodiment is used, as shown in Figure 5 , there is another step of connecting the two non-adjacent bottom sub-busbars in the bottom busbar 5 along the reserved groove of the bottom cover 8 through the wire, and then casting and welding the top busbar 4, and the subsequent process flow is consistent with the existing battery.

[0104] Comparative example:

[0105] Using a traditional grid without bottom tabs, such as Figure 7 As shown (the frame size is the same as in Example 1), lead-acid batteries are manufactured through processes such as paste preparation, coating, curing, assembly, and formation.

[0106] Table 1 shows the potential difference and cycle life data of the front-end battery composed of positive and negative plates in this embodiment and the existing battery composed of positive and negative plates.

[0107] Table 1

[0108]

[0109] Depend on Figure 6 As can be seen, compared with the comparative battery, the lead-acid battery with the grid structure of the plate grid 1 in Embodiment 1 (sparse at the top and bottom, dense in the middle, and sparse on the left and dense on the right) or the grid structure of the plate grid 1 in Embodiment 2 (sparse at the top and bottom, dense in the middle), with a grid structure of the third vertical rib 108 and the fourth vertical rib 109 arranged in a stepped distribution in the diagonal area, and the top busbar 4 and the bottom busbar 5 connected in parallel, can have its capacity increased by more than 50% and its cycle life increased by more than 50%.

[0110] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0111] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0112] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A plate, characterized in that The plate group (1) includes a rectangular frame, a plurality of horizontal ribs (101) and a plurality of first vertical ribs (102) are arranged in the rectangular frame, and the rectangular frame has opposite first and second side edges (103) and (104) in a first direction. The first side edge (103) is provided with the top tab (2), and the second side edge (104) is provided with the bottom tab (3), and the top tab (2) and the bottom tab (3) are symmetrically arranged. A plurality of horizontal ribs (101) and a plurality of first vertical ribs (102) are connected to form a grid structure. In the direction from the first side edge (103) to the middle of the plate group (1) and from the second side edge (104) to the middle of the plate group (1), the distance between every two adjacent horizontal ribs (101) decreases in turn. In a second direction, the plate group (1) also has opposite third and fourth side edges (105) and (106).

2. The pole plate of claim 1, wherein The first side edge (103) is perpendicular to the third side edge (105). The first direction is perpendicular to the second direction. The distance from the top tab (2) to the third side edge (105) is less than the distance from the top tab (2) to the fourth side edge (106), and the distance from the top tab (2) to the third side edge (105) is equal to the distance from the bottom tab (3) to the third side edge (105).

3. The pole plate of claim 2, wherein In the direction from the third side edge (105) to the fourth side edge (106), the distance between every two adjacent first vertical ribs (102) in the grid structure decreases in turn. The grid structure has a first coating area and a second coating area, and a plurality of second vertical ribs (107) are arranged in the first coating area and the second coating area, the lengths of the plurality of second vertical ribs (107) are the same, and the second vertical rib (107) is arranged between every two adjacent first vertical ribs (102).

4. The pole plate of claim 3, wherein The distance from the top tab (2) to the third side edge (105) is equal to the distance from the bottom tab (3) to the fourth side edge (106).

5. The pole plate of claim 2, wherein The grid structure has a third coating area and a fourth coating area, a plurality of third vertical ribs (108) are arranged in the third coating area, the lengths of the plurality of third vertical ribs (108) increase in turn in the direction from the third side edge (105) to the fourth side edge (106), and one end of each third vertical rib (108) is connected to the first side edge (103). A plurality of fourth vertical ribs (109) are arranged in the fourth coating area, the lengths of the plurality of fourth vertical ribs (109) increase in turn in the direction from the fourth side edge (106) to the third side edge (105), and one end of each fourth vertical rib (109) is connected to the second side edge (104). The plate group (1) includes a rectangular frame, a plurality of horizontal ribs (101) and a plurality of first vertical ribs (102) are arranged in the rectangular frame, and the rectangular frame has opposite first and second side edges (103) and (104) in a first direction.

6. A pole group structure, characterized by ​ The polar plates include positive polar plates and negative polar plates, and the positive polar plates and the negative polar plates are provided in plurality, the plurality of positive polar plates and the plurality of negative polar plates are staggered, and a U-shaped separator is sleeved on each positive polar plate.

7. The pole group structure of claim 6, wherein, Further comprising a top busbar (4) and a bottom busbar (5); The top tab (2) of each positive polar plate and the top tab (2) of each negative polar plate are connected with the top busbar (4); The bottom tab (3) of each positive polar plate and the bottom tab (3) of each negative polar plate are connected with the bottom busbar (5).

8. The pole group structure of claim 7, wherein, The positive terminal of the top busbar (4) is connected with the positive terminal of the bottom busbar (5) through a first connecting line (9); The negative terminal of the top busbar (4) is connected with the negative terminal of the bottom busbar (5) through a second connecting line (10).

9. A lead-acid battery characterised in that, The polar group structure comprises the polar group structure according to any one of claims 6-8, and the polar group structure is provided with six groups, and along a second direction, the polar group structure is provided with two groups; Along a third direction, the polar group structure is provided with three groups; The first direction, the second direction and the third direction are perpendicular to each other.

10. The lead-acid battery of claim 9, wherein, Further comprising a battery shell, the battery shell has a top cover (6), a shell (7) and a bottom cover (8) connected in sequence; The shell (7) is provided with a placing cavity (701) for placing the polar group structure.

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