Positive grid, plate group structure and lead-acid battery

Abstract

The utility model provides a positive plate grid, a plate group structure and a lead-acid battery, and relates to the technical field of batteries. The positive grid comprises a grid body, a first tab and a second tab, the grid body comprises a top side edge and a bottom side edge, the top side edge of the grid body is provided with a first tab, and the bottom side edge of the grid body is provided with a second tab; and the length of the second tab in the extending direction of the bottom side edge is greater than the length of the first tab in the extending direction of the top side edge. According to the positive grid, the second tab is arranged on the side edge of the bottom of the grid body, and the length of the second tab in the extending direction of the side edge of the bottom is larger than that of the first tab in the extending direction of the side edge of the top, so that more current can flow between the positive electrode and the negative electrode of the positive grid, and the current density distribution is more uniform and reasonable; the utilization rate of active substances at the bottom of the positive grid is effectively improved, and the cycle life of the battery is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a positive plate grid, a pole group structure and a lead-acid battery. Background Art

[0002] Lead-acid batteries have mature manufacturing processes, stable performance, and significant cost advantages, and have been widely used in many fields such as electric vehicles, backup power supplies, and power storage. The positive and negative plates are the core components of lead-acid batteries, usually composed of grids and active materials, where the grids are used to support and adhere the positive and negative active materials and conduct current.

[0003] like Figure 1 As shown, the lead-acid battery grid generally only has one pole ear 10 on the upper part of the frame of the positive plate 1, which has problems such as large current density and high active material utilization rate in the upper part, small current density and low active material utilization rate in the lower part, which can easily lead to the growth and deformation of the positive plate 1, and even the breakage of the grid ribs or the frame. The active material on the positive plate 1 is also easy to soften and fall off, thereby limiting the improvement of the cycle life of the lead-acid battery.

[0004] In order to solve the above problems, patent 201320135417.2 proposes to add two oblique ribs to the lower half of the positive grid. Although adding oblique ribs can alleviate the problem of uneven current distribution and slightly improve the utilization rate of active materials at the bottom of the positive grid, the improvement is limited. Utility Model Content

[0005] The purpose of the utility model is to provide a positive grid, a pole group structure and a lead-acid battery, so as to alleviate the technical problem existing in the prior art that although adding oblique ribs to the lower half of the positive grid of the lead-acid battery can alleviate the problem of uneven current distribution, the oblique ribs have limited effect on improving the utilization rate of the active material at the bottom of the positive grid.

[0006] In a first aspect, the utility model provides a positive electrode grid, comprising a grid body, a first pole tab and a second pole tab;

[0007] The grid body comprises a top side and a bottom side, the top side of the grid body is provided with the first pole lug, and the bottom side of the grid body is provided with the second pole lug;

[0008] The length of the second pole tab along the extending direction of the bottom side edge is greater than the length of the first pole tab along the extending direction of the top side edge.

[0009] In an optional embodiment, the second pole lug includes a plurality of pole lug plates, and the plurality of pole lug plates are spaced apart in sequence along the extension direction of the bottom side, and the sum of the lengths of the plurality of pole lug plates along the extension direction of the bottom side is greater than the length of the first pole lug along the extension direction of the top side.

[0010] In an optional embodiment, the second pole lug includes two pole lug plates, and the two pole lug plates are symmetrically distributed with the central axis of the grid body as the symmetry axis.

[0011] In an optional embodiment, the second pole tab is a full pole tab, and the center of the full pole tab is located on the central axis of the grid body.

[0012] In an optional embodiment, the grid body includes a frame, a plurality of transverse ribs and a plurality of vertical ribs are arranged in the frame, and the plurality of transverse ribs and the plurality of vertical ribs are interconnected to form a grid structure;

[0013] From the top side to the bottom side of the grid body, the grid structure includes an upper region, a middle region and a lower region in sequence, and the grid density of the upper region and the grid density of the lower region are both greater than the grid density of the middle region.

[0014] In a second aspect, the utility model provides a pole group structure, comprising a separator and a positive electrode grid as described in any one of the aforementioned embodiments;

[0015] There are a plurality of positive electrode grids, which are distributed in sequence and a separator is attached between any two adjacent positive electrode grids.

[0016] In an optional embodiment, it further includes a first bus bar and a second bus bar;

[0017] The first pole tabs on the plurality of positive electrode grids are connected in sequence through the first bus bar, and the second pole tabs on the plurality of positive electrode grids are connected in sequence through the second bus bar.

[0018] In an optional embodiment, the second bus bar includes a plurality of slots sequentially distributed along its extension direction, and the plurality of slots are snap-connected with the plurality of second pole tabs in a one-to-one correspondence.

[0019] In an optional embodiment, a conductive connecting member is further included, and the conductive connecting member is connected between the first bus bar and the second bus bar.

[0020] In a third aspect, the utility model provides a lead-acid battery, comprising the pole group structure described in any one of the aforementioned embodiments.

[0021] The positive electrode grid provided by the utility model comprises a grid body, a first pole ear and a second pole ear; the grid body comprises a top side and a bottom side, the top side of the grid body is provided with a first pole ear, and the bottom side of the grid body is provided with a second pole ear; the length of the second pole ear along the extension direction of the bottom side is greater than the length of the first pole ear along the extension direction of the top side. The positive electrode grid provided by the utility model can be used as a positive plate of a battery such as a lead-acid battery, wherein the surface of the grid body can be coated with a positive active material such as lead sulfate for current conduction. When used as a battery, a plurality of positive grids are usually required to be arranged in parallel to form a pole group. Since the positive grid provided by the utility model is provided with a second pole ear on the bottom side of each grid body, and the length of the second pole ear is greater than the length of the first pole ear along the extension direction of the bottom side, more current can flow between the multiple positive grids connected in parallel during the current flow, so that the bottom of each positive grid and the active material near the bottom can participate in the work, effectively improving the utilization rate of the active material at the bottom of the positive grid, and effectively improving the uniformity of the current density distribution on the positive grid, thereby effectively improving the cycle life of the battery.

[0022] Compared with the prior art, the positive electrode grid provided by the utility model can allow more current to flow between the positive and negative electrodes of the positive electrode grid, and the current density distribution is more uniform and reasonable, thereby effectively improving the utilization rate of the active material at the bottom of the positive electrode grid, and thereby effectively improving the cycle life of the battery.

[0023] The pole group structure provided by the utility model includes a separator and the above-mentioned positive electrode grid; there are multiple positive electrode grids, and the multiple positive electrode grids are distributed in sequence and a separator is attached between any two adjacent positive electrode grids. The pole group structure includes the above-mentioned positive electrode grid, so the pole group structure has the same beneficial effects as the above-mentioned positive electrode grid.

[0024] The lead-acid battery provided by the utility model comprises the above-mentioned pole group structure, so the lead-acid battery has the same beneficial effects as the above-mentioned pole group structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1It is a structural schematic diagram of a positive plate of an existing lead-acid battery;

[0027] Figure 2 A schematic diagram of the structure of the positive electrode grid provided in an embodiment of the utility model;

[0028] Figure 3 Another schematic diagram of the structure of the positive electrode grid provided in an embodiment of the utility model;

[0029] Figure 4 Another structural schematic diagram of the positive electrode grid provided in an embodiment of the utility model;

[0030] Figure 5 A comparison chart of the cycle life of a battery composed of an existing positive electrode plate and a battery composed of a positive electrode grid provided in an embodiment of the utility model;

[0031] Figure 6 A schematic diagram of the structure of the pole group provided by an embodiment of the utility model;

[0032] Figure 7 A schematic diagram of the structure of a second bus provided by an embodiment of the utility model;

[0033] Figure 8 A schematic diagram of a partial structure of a pole group structure provided in an embodiment of the utility model;

[0034] Fig. 9 Another structural schematic diagram of the pole group structure provided in an embodiment of the utility model.

[0035] Icons: 1-positive electrode plate; 10-ear; 2-grid body; 20-first ear; 21-second ear; 210-ear plate; 211-ear hole; 22-horizontal rib; 23-vertical rib; 3-first bus; 4-second bus; 40-slot; 400-protrusion; 5-conductive connector. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0039] Example:

[0040] like Figure 2 , Figure 3 and Figure 4 As shown, the positive electrode grid provided in this embodiment includes a grid body 2, a first pole ear 20 and a second pole ear 21; the grid body 2 includes a top side and a bottom side, the top side of the grid body 2 is provided with the first pole ear 20, and the bottom side of the grid body 2 is provided with the second pole ear 21; the length of the second pole ear 21 along the extension direction of the bottom side is greater than the length of the first pole ear 20 along the extension direction of the top side.

[0041] The positive electrode grid provided in this embodiment can be used as the positive electrode plate 1 of a lead-acid battery or other battery. Specifically, the positive electrode grid can be made into a battery through the steps of paste making, plate coating, curing, assembly, and formation. Among them, paste making refers to the manufacture of positive electrode active materials such as lead sulfate for conducting current, plate coating refers to coating the positive electrode active material on the surface of the grid body 2, curing refers to curing the positive electrode active material on the grid body 2, and assembly refers to arranging multiple positive electrode grids in parallel in sequence, and electrically connecting the first pole ears 20 in the multiple positive electrode grids in sequence, and electrically connecting the second pole ears 21 in the multiple positive electrode grids in sequence, so as to form a positive electrode group.

[0042] It should be noted that, since in the positive electrode grid provided in this embodiment, the bottom side of each grid body 2 is also provided with a second pole ear 21, and along the extension direction of the bottom side, the length of the second pole ear 21 is greater than the length of the first pole ear 20, therefore, when the current flows on the positive electrode group, more current can flow between the multiple positive electrode grids connected in parallel, so that the bottom of each positive electrode grid and the active material near the bottom can participate in the work, effectively improving the utilization rate of the active material at the bottom of the positive electrode grid, and effectively improving the uniformity of the current density distribution on the positive electrode grid, thereby effectively improving the cycle life of the battery.

[0043] Compared with the prior art, the positive electrode grid provided in this embodiment can allow more current to flow between the positive and negative electrodes of the positive electrode grid, and the current density distribution is more uniform and reasonable, effectively improving the utilization rate of the active material at the bottom of the positive electrode grid, thereby effectively improving the cycle life of the battery.

[0044] It should be noted that the positive electrode grid provided in this embodiment does not only solve the problem of uneven current density distribution by adding a second pole ear 21 at the bottom of the positive electrode grid, but also limits the length of the second pole ear 21 along the bottom side extension direction to be greater than the length of the first pole ear 20 along the top side extension direction, thereby achieving the effect of making the current density on the positive electrode grid uniform and improving the utilization rate of the active material at the bottom of the positive electrode grid.

[0045] Therefore, although patent CN103840173A proposes a bipolar lug plate 210 grid structure in which the pole lugs 10 are respectively arranged on the upper frame and the lower frame, the pole lugs 10 on the upper frame and the pole lugs 10 on the lower frame of the bipolar lug plate 210 grid are not only consistent in structure, but also completely the same in size, so it cannot achieve the effect of improving the utilization rate of the active material at the bottom of the positive electrode grid. More importantly, in the bipolar lug plate 210 grid structure disclosed in the above patent, the pole lugs 10 on the upper frame and the pole lugs 10 on the lower frame are arranged diagonally, resulting in an asymmetric structure of the grid. When the grid is installed in the battery shell, the position where the grid is not provided with the pole lug 10 cannot be supported, and it is very easy to tilt and tilt, resulting in the grid being difficult to maintain balance, which is disadvantageous to the battery assembly process. In the positive electrode grid provided in this embodiment, the length of the second pole lug 21 on the bottom side of the grid body 2 is greater than the length of the first pole lug 20, which can effectively increase the contact area between the pole lug 10 and the inner wall of the battery shell, thereby improving the installation balance of the positive electrode grid in the battery shell.

[0046] In addition, since the length of the second pole ear 21 in the positive electrode grid provided in this embodiment is greater than the length of the first pole ear 20, the installation balance of the positive electrode grid in the battery shell can be effectively guaranteed. Based on this, in the process of assembling the battery, the battery assembly effect can be guaranteed by adjusting the size of the grid body 2 to make it adapt to the existing battery shell. There is no need to make major improvements to various molds in the battery manufacturing process to ensure the installation balance of the positive electrode grid. Therefore, the positive electrode grid provided in this embodiment also has good applicability, and there is no need to make major improvements to the existing battery production line. It can reduce the modification cost of the battery production line while improving the battery life.

[0047] In this embodiment, if Figure 2 and Figure 3As shown, the second pole lug 21 may include a plurality of pole lug plates 210, which are spaced apart in sequence along the extension direction of the bottom side, and the sum of the lengths of the plurality of pole lug plates 210 along the extension direction of the bottom side is greater than the length of the first pole lug 20 along the extension direction of the top side.

[0048] When the second pole lug 21 includes multiple pole lug plates 210, as long as the sum of the lengths of the multiple pole lug plates 210 along the extension direction of the bottom side is greater than the length of the first pole lug 20, the uniformity of the current sealing distribution on the positive electrode grid can still be guaranteed, and the utilization rate of the active material at the bottom of the positive electrode grid can still be effectively improved.

[0049] It should be noted that when the positive electrode grid provided in this embodiment is used to assemble into a battery, not only are multiple positive electrode grids used and multiple positive electrode grids are arranged in parallel, but the first pole ears 20 on the multiple positive electrode grids are electrically connected in sequence, and the second pole ears 21 on the multiple positive electrode grids are also electrically connected in sequence, so that the multiple positive electrode grids are connected in parallel.

[0050] If the second electrode tab 21 includes a plurality of electrode tab plates 210 , then in the plurality of positive electrode grids arranged in parallel, the plurality of electrode tab plates 210 corresponding to any group of positions are electrically connected in sequence.

[0051] It should also be noted that if the plurality of second pole tabs 21 are electrically connected in sequence through conductive structures such as wires, then in order to facilitate the electrical connection, the second pole tabs 21 may be provided with perforations for convenient electrical connection. Figure 2 As shown, in this case, the second pole tab 21 does not need to be provided with a through hole for facilitating connection.

[0052] like Figure 2 and Figure 3 As shown, the second pole lug 21 may include two pole lug plates 210 , and the two pole lug plates 210 are symmetrically distributed with the central axis of the grid body 2 as the symmetry axis.

[0053] When the two electrode lug plates 210 are symmetrically distributed with the central axis of the grid body 2 as the symmetry axis, the installation balance of the positive electrode grid can be further effectively improved.

[0054] like Figure 4 As shown, the second pole tab 21 may also be a full pole tab 10 , and the center of the full pole tab 10 is located on the central axis of the grid body 2 .

[0055] The full pole tab 10 refers to a pole tab 10 structure in which the second pole tab 21 is formed by a pole tab plate 210 . The full pole tab 10 can also improve the uniformity of current density distribution and improve the utilization rate of active materials at the bottom of the positive electrode grid.

[0056] It should be noted that, since the center of the full pole tab 10 is located on the central axis of the grid body 2, the position balance of the second pole tab 21 on the grid body 2 can be effectively guaranteed, and the installation balance of the positive grid can also be effectively improved.

[0057] like Figure 2-Figure 4 As shown, the grid body 2 includes a frame, in which a plurality of transverse ribs 22 and a plurality of vertical ribs 23 are arranged, and the plurality of transverse ribs 22 and the plurality of vertical ribs 23 are interconnected to form a grid structure; from the top side to the bottom side of the grid body 2, the grid structure includes an upper area, a middle area and a lower area in sequence, and the grid density of the upper area and the grid density of the lower area are both greater than the grid density of the middle area.

[0058] The mesh density of the upper region is greater than that of the middle region, which means that the spacing between two adjacent transverse ribs 22 in the upper region is smaller than the spacing between two adjacent transverse ribs 22 in the middle region, and the spacing between two adjacent vertical ribs 23 in the upper region is smaller than the spacing between two adjacent vertical ribs 23 in the middle region. Similarly, the mesh density of the lower region is greater than that of the middle region, which means that the spacing between two adjacent transverse ribs 22 in the lower region is smaller than the spacing between two adjacent transverse ribs 22 in the middle region, and the spacing between two adjacent vertical ribs 23 in the lower region is smaller than the spacing between two adjacent vertical ribs 23 in the middle region.

[0059] Compared to Figure 1 The existing positive plate 1 with uniform grid density is shown, Figure 2-Figure 4 The positive electrode grid in the present embodiment shown can utilize the upper region with a higher mesh density to effectively increase the contact area between the active material and the current, thereby increasing the current conduction area.

[0060] When the current conduction area increases, the current distribution on each transverse rib 22 and vertical rib 23 in the upper area can be effectively reduced, thereby reducing the current carrying burden on each transverse rib 22 and vertical rib 23, improving the corrosion resistance of each transverse rib 22 and vertical rib 23, and extending the service life of the positive electrode grid.

[0061] When the contact area between the active material and the current increases, the current density carried by the active material in each location can be reduced, thereby effectively reducing the overall impedance of the grid body 2, improving the corrosion resistance of the grid, and slowing down the corrosion rate of the positive electrode grid. At the same time, it can also reduce the expansion and contraction loads of the active material on the grid body 2, further effectively improving the utilization rate of the active material, preventing local active materials from working intensively for a long time and converting into substances such as lead dioxide, thereby preventing the active material from softening and falling off due to reduced bonding between the grid body 2.

[0062] also, Figure 1In the existing positive plate 1 with uniform grid density shown, the bottom active material is far away from the upper pole ear 10, resulting in a large potential difference (voltage difference) between the top and bottom of the positive plate 1 (usually about 0.15V). Therefore, in the existing positive plate 1, the current will flow slower and slower from the top to the bottom, and the impedance encountered will become larger and larger, resulting in a gradual decrease in the utilization rate of the active material on the positive plate 1. As the use time increases, the battery will experience a failure mode, that is, the top and upper active materials of the battery positive plate 1 soften and fall off, while most of the lower and bottom active materials do not participate in the reaction.

[0063] And as Figure 2-Figure 4 As shown, the positive electrode grid in this embodiment can utilize the lower area with a higher grid density, combined with the second electrode ear 21, so that the active materials in the lower and bottom parts of the grid body 2 can participate in the reaction more, effectively improving the utilization rate of the active materials in the lower and bottom parts of the grid body 2, thereby effectively reducing the voltage difference between the top and bottom of the positive electrode grid and improving the polarization phenomenon of the battery.

[0064] Table 1 is a data table of the potential difference and cycle life of the battery composed of the positive plate grid of this embodiment and the battery composed of the existing positive plate 1.

[0065] Table 1

[0066] Potential difference between top and bottom / mV Cycle life / cycle The battery composed of the positive electrode grid of this embodiment 76 663 Existing battery composed of positive plate 1 159 412

[0067] According to the data comparison in Table 1, it can be seen that compared with the battery composed of the existing positive plate 1, the battery formed by the positive electrode grid provided in this embodiment can reduce the potential difference between the top and the bottom of the positive electrode grid by more than 80mV, and the battery cycle life can be increased by more than 50%. Therefore, the positive electrode grid provided in this embodiment can effectively reduce the voltage difference between the top and the bottom, and can effectively extend the battery life.

[0068] also, Figure 5 The comparison chart of the battery cycle life composed of the existing positive plate 1 and the battery cycle life composed of the positive plate grid provided by the embodiment of the utility model is as follows: Figure 5 As shown in the figure, the horizontal axis is the cycle life of the battery, the vertical axis is the capacity retention rate of the battery (referring to the ratio of the capacity of the battery to the initial capacity after a period of use), the dotted line represents the data curve of the battery composed of the existing positive plate 1, and the solid line represents the data curve of the battery composed of the positive plate grid in this embodiment. Figure 5 It can be seen from the data comparison that the cycle life of the battery composed of the positive electrode grid provided by this embodiment can be effectively improved.

[0069] The mesh density of the upper region and the mesh density of the lower region may be unequal or equal, as long as the mesh density of the upper region and the mesh density of the lower region are both greater than the mesh density of the middle region.

[0070] For the convenience of processing, in this embodiment, the mesh density of the upper area of ​​the grid body 2 is preferably equal to the mesh density of the lower area.

[0071] like Figure 6 As shown, this embodiment also provides a pole group structure, which includes a partition and the above-mentioned positive electrode grid; there are multiple positive electrode grids, and the multiple positive electrode grids are distributed in sequence and a partition is attached between any two adjacent positive electrode grids in a group.

[0072] The separator is used to play an insulating role. Since the pole group structure provided in this embodiment is formed by staggered arrangement of multiple positive electrode grids and separators, the pole group structure provided in this embodiment is a positive pole group.

[0073] It should be noted that, since the pole group structure provided in this embodiment includes the above-mentioned positive electrode grid, the pole group structure provided in this embodiment and the above-mentioned positive electrode grid can solve the same technical problems and achieve the same technical effects, which will not be repeated here.

[0074] like Figure 7 , Figure 8 and Fig. 9 As shown, the pole group structure provided in this embodiment also includes a first bus bar 3 and a second bus bar 4; the first pole tabs 20 on multiple positive grids are connected in sequence through the first bus bar 3, and the second pole tabs 21 on multiple positive grids are connected in sequence through the second bus bar 4.

[0075] The first bus 3 and the second bus 4 are both conductive structures, which are respectively used to realize the sequential electrical connection between the first pole ears 20 on multiple positive grids, and the sequential electrical connection between the second pole ears 21 on multiple positive grids, thereby realizing the parallel connection between multiple positive grids in the pole group structure.

[0076] In practical applications, the first busbar 3 and the second busbar 4 may both adopt conductive structures such as wires and conductive sheets, or may adopt curable conductive liquids.

[0077] like Figure 7 As shown, in this embodiment, the second bus bar 4 preferably includes a plurality of slots 40 distributed in sequence along its extension direction, and the plurality of slots 40 are engaged with the plurality of second tabs 21 in a one-to-one corresponding manner.

[0078] When the second bus 4 includes a plurality of slots 40 distributed in sequence along its extension direction, the second bus 4 is electrically connected to the plurality of second pole ears 21 by a snap-fitting manner. At this time, the second bus 4 can not only electrically connect the plurality of second pole ears 21 in sequence, but also play a snap-fitting and limiting role for the plurality of second pole ears 21, thereby effectively ensuring the connection stability between the plurality of second pole ears 21.

[0079] To improve the connection stability between the second bus bar 4 and the second electrode tab 21, Figure 3 As shown, the second pole ear 21 may be provided with a pole ear hole 211, and as shown in Figure 7 As shown, the inner wall of each of the slots 40 is provided with a protrusion 400. The protrusion 400 is used to be engaged in the tab hole 211 when the slot 40 is engaged with the second tab 21, thereby playing a limiting role, further effectively ensuring the stability of the engagement between the second bus 4 and the second tab 21.

[0080] like Fig. 9 As shown, the pole group structure provided in this embodiment further includes a conductive connector 5 , and the conductive connector 5 is connected between the first bus bar 3 and the second bus bar 4 .

[0081] The conductive connector 5 can be a strip structure such as a conductive metal strip, which is used to achieve parallel connection between the top and bottom of the pole group structure, thereby reducing the overall internal resistance of the pole group structure, making the current flow smoother, and further making the current density distribution on the entire pole group structure more reasonable and uniform. It can also improve the utilization rate of the active material at the bottom of the pole group structure and extend the battery life.

[0082] It should be noted that when the second pole lug 21 includes a plurality of pole lug plates 210, the pole lug plates 210 corresponding to each group of positions on the plurality of positive electrode grids are sequentially connected through a second bus 4. For example, when the second pole lug 21 includes two pole lug plates 210, Fig. 9 As shown, the pole lug plates 210 corresponding to one group of positions are sequentially connected through a second bus bar 4, and the pole lug plates 210 corresponding to another group of positions are sequentially connected through another second bus bar 4. Based on this, when the conductive connector 5 is connected between the first bus bar 3 and the second bus bar 4, the conductive connector 5 can be connected only between one of the second bus bars 4 and the first bus bar 3. At this time, the conductive connector 5 can still play a role in improving the utilization rate of the active material at the bottom of the pole group structure and extending the battery life.

[0083] In addition, Table 2 is a data table of the potential difference and cycle life of the battery composed of the pole group structure including the conductive connector 5 provided in this embodiment, the battery composed of the positive plate grid of the aforementioned embodiment (excluding the conductive connector 5) and the battery composed of the existing positive plate 1.

[0084] Table 2

[0085]

[0086] According to the data comparison in Table 2, it can be seen that compared with the battery composed of the existing positive electrode plate 1, the battery composed of the positive electrode grid not including the conductive connector 5, the battery composed of the electrode group structure including the conductive connector 5 has a smaller potential difference between the top and the bottom of the positive electrode grid and a higher battery cycle life. Therefore, when the electrode group structure provided in this embodiment includes the conductive connector 5, it can further effectively reduce the voltage difference between the top and the bottom, and further effectively extend the battery life.

[0087] This embodiment also provides a lead-acid battery, which includes the above-mentioned pole group structure. Therefore, the lead-acid battery and the above-mentioned pole group structure can solve the same technical problems and achieve the same technical effects, which will not be repeated here.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A positive electrode grid, characterized in that: It comprises a grid body (2), a first pole lug (20) and a second pole lug (21); The grid body (2) comprises a top side and a bottom side, the top side of the grid body (2) is provided with the first pole lug (20), and the bottom side of the grid body (2) is provided with the second pole lug (21); The length of the second pole tab (21) along the extending direction of the bottom side edge is greater than the length of the first pole tab (20) along the extending direction of the top side edge.

2. The positive electrode grid according to claim 1, characterized in that: The second pole lug (21) comprises a plurality of pole lug plates (210), wherein the plurality of pole lug plates (210) are sequentially spaced apart along the extension direction of the bottom side edge, and the sum of the lengths of the plurality of pole lug plates (210) along the extension direction of the bottom side edge is greater than the length of the first pole lug (20) along the extension direction of the top side edge.

3. The positive electrode grid according to claim 2, characterized in that: The second pole lug (21) comprises two pole lug plates (210), and the two pole lug plates (210) are symmetrically distributed with the central axis of the grid body (2) as the symmetry axis.

4. The positive electrode grid according to claim 1, characterized in that: The second pole tab (21) is a full pole tab (10), and the center of the full pole tab (10) is located on the central axis of the grid body (2).

5. The positive electrode grid according to any one of claims 1 to 4, characterized in that: The grid body (2) comprises a frame, a plurality of transverse ribs (22) and a plurality of vertical ribs (23) are arranged in the frame, and the plurality of transverse ribs (22) and the plurality of vertical ribs (23) are interconnected to form a grid structure; From the top side to the bottom side of the grid body (2), the grid structure comprises an upper region, a middle region and a lower region in sequence, and the grid density of the upper region and the grid density of the lower region are both greater than the grid density of the middle region.

6. A pole group structure, characterized in that: A positive electrode grid comprising a separator and any one of claims 1 to 5; There are a plurality of positive electrode grids, which are distributed in sequence and a separator is attached between any two adjacent positive electrode grids.

7. The pole group structure according to claim 6, characterized in that: Also includes a first bus bar (3) and a second bus bar (4); The first pole tabs (20) on the plurality of positive electrode grids are connected in sequence via the first bus bar (3), and the second pole tabs (21) on the plurality of positive electrode grids are connected in sequence via the second bus bar (4).

8. The pole group structure according to claim 7, characterized in that: The second bus bar (4) comprises a plurality of slots (40) distributed in sequence along its extension direction, and the plurality of slots (40) are connected to the plurality of second pole tabs (21) in a one-to-one corresponding manner.

9. The pole group structure according to claim 7, characterized in that: It also comprises a conductive connecting member (5), wherein the conductive connecting member (5) is connected between the first busbar (3) and the second busbar (4).

10. A lead-acid battery, characterized in that: Comprising the pole group structure as described in any one of claims 6-9.

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