Storage battery with primary-secondary double-tab polar plate

Abstract

The utility model discloses a storage battery with a primary-secondary double-tab polar plate, which relates to the technical field of storage batteries, a primary tab and a secondary tab are respectively positioned on two sides of a grid center line, the secondary tab is far away from the grid center line, and the primary tab is close to the grid center line. The width ratio of the son tab to the mother tab is approximately the same as the ratio of the distance from the center of the son tab to the center of the grid and the distance from the center of the mother tab to the center of the grid, and the current density borne by the son tab is close to that borne by the mother tab. Compared with a traditional single-tab pole plate, the structure has the advantages that the potential drop is reduced, the uniformity of the utilization rate of active substances at all positions of the pole plate and the large-current discharge capacity are improved, meanwhile, the series welding mode between single cells is completely compatible with an existing manufacturing system, and the process difficulty of double-tab battery production is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of storage batteries, in particular to a storage battery with parent-child bipolar tab plates. Background Art

[0002] The plate is the main component of the battery. The plate is composed of a grid and active materials coated on the grid. The grid supports the active materials and is the carrier of the active materials. It is also the collector skeleton of the plate, which conducts and collects current. The collected current will eventually be connected to the external circuit through the pole ears and busbars of the grid. For traditional batteries, in the same battery cell, the pole ears of the positive plate are concentrated in one area and are welded in parallel through the busbar. The pole ears of the negative plate are concentrated in another area and are also welded in parallel through the busbar. The positive and negative buses have a certain distance and do not touch each other. The capacity of the battery is determined by the total capacity of the parallel plates in the cell; between cells, the negative busbar of the first cell is connected to the positive busbar of the second cell to achieve series connection between cells. The number of cells in series determines the voltage of the battery.

[0003] Since the current of the plate needs to be conducted through the ear on the grid, the position of the ear has a great influence on the collection path of the plate current. For the single-electrode ear plate of the traditional battery, the ear is theoretically located in the middle of the plate with the smallest internal resistance. However, from the series welding method, it can be seen that the negative plate ear of the first single-cell group and the positive plate ear of the second single-cell group are in the same area. For the same battery, for the convenience of production, the external dimensions of the positive and negative plates are unchanged. Therefore, the positions of the positive and negative ears are basically symmetrically distributed with respect to the center line of the plate, and the ears cannot be centered. In the actual production application of the battery, the positive and negative bus bars are symmetrical with the center of the plate, and there is enough space between the positive and negative bus bars to install a bleed valve.

[0004] In order to make the current distribution more uniform, some companies in the industry have proposed a bipolar ear plate structure and produced some patents, but all of them have disadvantages such as reduced space utilization, complex process, and incompatibility with existing production equipment. For example, in patent CN215496997 U, the busbar needs to be welded twice, and the busbar is staggered in space, which not only occupies the upper space, but also requires additional isolation or fixation to prevent the positive and negative busbars from short-circuiting; in patent CN 202333041 U, although the production process is compatible with existing equipment, its bipolar ears are distributed on the same side of the center line of the plate. If these two ears are merged, it is completely equivalent to the traditional single ear. There is no part of the ear on the other side of the center line of the plate, and the conductive condition is not improved; patent CN 209804792 U does improve the uniformity of current distribution, but it requires two weldings and two packagings, low space utilization, complex process, and incompatibility with equipment. In view of the above defects, bipolar ear technology has not been promoted and used in the industry. Utility Model Content

[0005] In view of the deficiencies raised in the background technology, the utility model studies and designs a battery with a mother-and-child bipolar lug plate, the purpose of which is to provide a battery with a mother-and-child bipolar lug plate that can reduce the plate potential drop, improve the utilization rate of active materials, improve the battery's large current charging and discharging performance, and improve the battery's production efficiency and reliability.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A battery with a mother-and-child bipolar lug plate comprises a mother-and-child lug, a mother-and-child lug and a grid. The mother-and-child lug is narrow and far from the center line of the grid, while the mother-and-child lug is wide and close to the center line of the grid. The mother-and-child lugs are respectively located on both sides of the center line of the grid. The ratio of the width of the mother-and-child lug to the width of the daughter-and-child lug is the same as the ratio of the distances from the center of the daughter-and-child lug to the center of the grid.

[0008] Furthermore, the difference between the distance from the inner edge of the sub-pole lug to the center line of the grid and the distance from the outer edge of the mother pole lug to the center line of the grid is in the range of 2-100 mm, and the distance from the inner edge of the mother pole lug to the center line of the plate is in the range of 6-100 mm.

[0009] Furthermore, after coating the plates, positive and negative active materials are coated respectively to obtain a mother-and-child bipolar ear positive electrode plate and a mother-and-child bipolar ear negative electrode plate, and the mother-and-child bipolar ear positive electrode plate and the mother-and-child bipolar ear negative electrode plate are assembled into a pole group in sequence with a separator, and the pole group is characterized in that: the mother-and-child bipolar ear positive electrode plate and the mother-and-child bipolar ear negative electrode plate are separated by separators in sequence, the sub-electrode ears of the mother-and-child bipolar ear positive electrode plate and the sub-electrode ears of the mother-and-child bipolar ear negative electrode plate are separated on both sides, and the mother-electrode ears of the mother-and-child bipolar ear positive electrode plate and the mother-electrode ears of the mother-and-child bipolar ear negative electrode plate are close to the middle.

[0010] Furthermore, in different cells placed in the battery slot, the pole groups of any adjacent cells are rotated 180 degrees with each other, the positive electrode sub-pole ear of the previous cell and the negative electrode sub-pole ear of the next cell are located in the same area, the positive electrode mother pole ear of the previous cell and the negative electrode mother pole ear of the next cell are located in the same area, the negative electrode sub-pole ear of the previous cell and the positive electrode sub-pole ear of the next cell are located in the same area, and the negative electrode mother pole ear of the previous cell and the positive electrode mother pole ear of the next cell are located in the same area.

[0011] Furthermore, of the different single-cell electrode groups placed in the battery slot, the positive electrode mother and daughter pole lugs and the positive terminal of the first single cell are welded together as a battery lead-out positive electrode; the negative electrode mother lug of the first single cell and the positive electrode mother lug of the second single cell, and the negative electrode sub-pole lug of the first single cell and the positive electrode sub-pole lug of the second single cell are welded together to realize the series connection of the first single-cell electrode group and the second single-cell electrode group; the positive electrode mother lug of the second single cell and the negative electrode mother lug of the third single cell, and the positive electrode sub-pole lug of the second single cell and the negative electrode sub-pole lug of the third single cell are welded together to realize the series connection of the second single-cell electrode group and the third single-cell electrode group, and so on, the negative electrode mother and daughter pole lugs and the negative terminal of the last single cell are welded together to serve as the battery lead-out negative electrode.

[0012] Furthermore, all the parent and child pole ears of the pole group extend out of the pole plate at the same height, the bus bars do not cross each other, all welding actions can be completed simultaneously in a pair of welding molds, and all bus bars can be formed simultaneously.

[0013] Furthermore, both ends of the battery slot are extended for a distance to accommodate the positive bus bar and the negative bus bar, and reinforcing ribs with a height of 5-15 mm are added to the slot wall.

[0014] Furthermore, the battery cover of the battery slot is provided with glue grooves at positions corresponding to the busbars, epoxy glue is injected into the glue grooves, and all the busbars are immersed in the epoxy glue.

[0015] Beneficial effects of the utility model:

[0016] 1. The mother-and-child bipolar tab plate battery of the present invention has asymmetric mother-and-child tabs, which avoids the defects of the existing bipolar tab technology such as complex process, large space occupation, and incompatible manufacturing equipment, and is economical and convenient to produce;

[0017] 2. Reasonable design of the position and width of the parent and child tabs can effectively adjust the current density at various locations on the plate, improve the utilization rate of active materials, reduce internal resistance, and improve the battery's high-current charging and discharging capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a mother-and-child double-electrode positive plate grid 1 obtained by continuous casting and continuous punching;

[0019] Figure 2 The utility model is a mother-and-child double-electrode tab negative grid 2 obtained by continuous casting and continuous punching;

[0020] Figure 3 It is the utility model of the mother-child bipolar ear positive plate 3;

[0021] Figure 4 It is the utility model of the mother-child bipolar ear negative plate 4;

[0022] Figure 5 The utility model is a pole group 6 composed of a positive plate 3, a negative plate 4 and a separator 5;

[0023] Figure 6 The positional relationship of the pole group 6 of the utility model placed in different cells of the battery slot 7;

[0024] Figure 7 This is the welding method of the busbar and the battery lead-out terminal of the utility model;

[0025] Figure 8 It is a battery cover 10 of the utility model;

[0026] Fig. 9 This is an example of a 2x3 arrangement of battery cells of the present invention. DETAILED DESCRIPTION

[0027] 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.

[0028] In the description of the embodiments of the present utility model, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the embodiments of the present invention, "multiple" means at least 2.

[0031] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] A battery with a mother-and-child bipolar lug plate comprises a mother-and-child lug, a mother-and-child lug and a grid. The mother-and-child lug is narrow and far from the center line of the grid, while the mother-and-child lug is wide and close to the center line of the grid. The mother-and-child lugs are respectively located on both sides of the center line of the grid. The ratio of the width of the mother-and-child lug to the width of the daughter-and-child lug is the same as the ratio of the distances from the center of the daughter-and-child lug to the center of the grid.

[0033] Furthermore, the difference between the distance from the inner edge of the sub-pole lug to the center line of the grid and the distance from the outer edge of the mother pole lug to the center line of the grid is in the range of 2-100 mm, and the distance from the inner edge of the mother pole lug to the center line of the plate is in the range of 6-100 mm.

[0034] Furthermore, after coating the plates, positive and negative active materials are coated respectively to obtain a mother-and-child bipolar ear positive electrode plate and a mother-and-child bipolar ear negative electrode plate, and the mother-and-child bipolar ear positive electrode plate and the mother-and-child bipolar ear negative electrode plate are assembled into a pole group in sequence with a separator, and the pole group is characterized in that: the mother-and-child bipolar ear positive electrode plate and the mother-and-child bipolar ear negative electrode plate are separated by separators in sequence, the sub-electrode ears of the mother-and-child bipolar ear positive electrode plate and the sub-electrode ears of the mother-and-child bipolar ear negative electrode plate are separated on both sides, and the mother-electrode ears of the mother-and-child bipolar ear positive electrode plate and the mother-electrode ears of the mother-and-child bipolar ear negative electrode plate are close to the middle.

[0035] Furthermore, in different cells placed in the battery slot, the pole groups of any adjacent cells are rotated 180 degrees with each other, the positive electrode sub-pole ear of the previous cell and the negative electrode sub-pole ear of the next cell are located in the same area, the positive electrode mother pole ear of the previous cell and the negative electrode mother pole ear of the next cell are located in the same area, the negative electrode sub-pole ear of the previous cell and the positive electrode sub-pole ear of the next cell are located in the same area, and the negative electrode mother pole ear of the previous cell and the positive electrode mother pole ear of the next cell are located in the same area.

[0036] Furthermore, of the different single-cell electrode groups placed in the battery slot, the positive electrode mother and daughter pole lugs and the positive terminal of the first single cell are welded together as a battery lead-out positive electrode; the negative electrode mother lug of the first single cell and the positive electrode mother lug of the second single cell, and the negative electrode sub-pole lug of the first single cell and the positive electrode sub-pole lug of the second single cell are welded together to realize the series connection of the first single-cell electrode group and the second single-cell electrode group; the positive electrode mother lug of the second single cell and the negative electrode mother lug of the third single cell, and the positive electrode sub-pole lug of the second single cell and the negative electrode sub-pole lug of the third single cell are welded together to realize the series connection of the second single-cell electrode group and the third single-cell electrode group, and so on, the negative electrode mother and daughter pole lugs and the negative terminal of the last single cell are welded together to serve as the battery lead-out negative electrode.

[0037] Furthermore, all the parent and child pole ears of the pole group extend out of the pole plate at the same height, the bus bars do not cross each other, all welding actions can be completed simultaneously in a pair of welding molds, and all bus bars can be formed simultaneously.

[0038] Furthermore, both ends of the battery slot are extended for a distance to accommodate the positive bus bar and the negative bus bar, and reinforcing ribs with a height of 5-15 mm are added to the slot wall.

[0039] Furthermore, the battery cover of the battery slot is provided with glue grooves at positions corresponding to the busbars, epoxy glue is injected into the glue grooves, and all the busbars are immersed in the epoxy glue.

[0040] Example 1

[0041] The mother-child bipolar tab grid is obtained by continuous casting and continuous punching. Figure 1 The figure shows a positive grid 1 of a mother-and-child bipolar lug obtained by continuous casting and continuous punching. The mother lug is marked as 010, and the daughter lug is marked as 011. Figure 2 The figure shows the negative grid 2 of the mother-and-child bipolar lugs, where the mother lug is marked as 020 and the daughter lug is marked as 021. In order to prevent short circuit in busbar welding, the difference between the distance tn from the inner side of the daughter lug to the center line of the grid and the distance Tw from the outer side of the mother lug to the center line of the grid is 11.5 mm. At the same time, in order to reserve enough space for the installation of the bleed valve, the distance Tn from the inner side of the mother lug to the center line of the plate is 13.5 mm.

[0042] Furthermore, the mother-child bipolar tab positive grid 1 is coated, cured, dried, and separated to obtain Figure 3 The mother-and-child bipolar tab positive plate 3 is shown; similarly, the mother-and-child bipolar tab negative grid 2 is coated, cured, dried, and separated to obtain a Figure 4 The mother-and-child bipolar tab negative electrode plate 4 is shown.

[0043] Furthermore, the mother-and-child bipolar tab positive electrode plate 3 and the mother-and-child bipolar tab negative electrode plate 4 are separated by a separator 5 in sequence, forming Figure 5In the pole group 6 shown, the sub-pole ear 011 of the positive electrode plate 3 and the sub-pole ear 021 of the negative electrode plate 4 are located on both sides, the mother pole ear 010 of the positive electrode plate 3 and the mother pole ear 020 of the negative electrode plate 4 are close to the middle, and the sub-pole ear 011, mother pole ear 020, mother pole ear 010, and sub-pole ear 021 are respectively located in different areas.

[0044] Further, the pole group 6 is placed in Figure 6 In the cells 1, 2, 3, 4, 5, 6 of the battery slot 7 shown, the pole groups corresponding to the cells 1, 2, 3, 4, 5, 6 are pole groups 61, pole group 62, pole group 63, pole group 64, pole group 65, and pole group 66. The order of the pole ears from left to right for the pole groups 61, 63, and 65 in the cells 1, 3, and 5 is sub-pole ear 011, mother pole ear 020, mother pole ear 010, and sub-pole ear 021; the pole groups 62, 64, and 66 of the cells 2, 4, and 6 are obtained by rotating the pole group 6 180 degrees, and the order of the pole ears from left to right is sub-pole ear 021, mother pole ear 010, mother pole ear 020, and sub-pole ear 011. Between two adjacent cells, the sub-pole ear 021 and the sub-pole ear 011 are always located in the same area, and the mother pole ear 010 and the mother pole ear 020 are located in the same area.

[0045] Furthermore, if Figure 7As shown, all the positive pole lugs 011 and the positive pole lugs 010 of the pole group 61 in the single cell 1 are welded together, and the solder solidifies to form a bus 610. At the same time, the positive terminal 8 is also welded together with the bus 610 to form a positive lead-in terminal; all the negative pole lugs 021 of the pole group 61 in the single cell 1 and all the positive pole lugs 011 of the pole group 62 in the single cell 2 are welded together, and the solder solidifies to form a bus 6121, all the negative pole lugs 020 of the pole group 61 and all the positive pole lugs 010 of the pole group 62 in the single cell 2 are welded together, and the solder solidifies to form a bus 6120, and the buses 6120 and 6121 realize the series connection of the single cell 1 and the single cell 2; all the positive pole lugs 011 of the pole group 62 in the single cell 2 and all the negative pole lugs 011 of the pole group 63 in the single cell 3 are welded together. The sub-pole ears 021 are welded together, and after the solder solidifies, they become bus 6231. All the positive mother pole ears 010 of the pole group 62 and all the negative mother pole ears 020 of the pole group 63 in the single cell 3 are welded together, and after the solder solidifies, they become bus 6230. Buses 6230 and 6231 realize the series connection of single cell 2 and single cell 3. Similarly, buses 6340 and 6341 can realize the series connection of single cell 3 and single cell 4, buses 6450 and 6451 realize the series connection of single cell 4 and single cell 5, and buses 6560 and 6561 realize the series connection of single cell 5 and single cell 6. Finally, all the negative sub-pole ears 021 and negative mother pole ears 020 of the pole group 66 in the single cell 6 are welded together, and after the solder solidifies, they become bus 660. At the same time, the negative terminal 9 and bus 660 are also welded together to become the negative lead-in terminal. The battery slot 7 is different from an ordinary battery slot in that both ends are extended for a distance to accommodate the positive bus 610 and the negative bus 660, and reinforcing ribs 5-10 mm high are added to the slot wall to maintain the pole group pressure and delay the expansion, softening and shedding of the positive active material.

[0046] Furthermore, the pole groups 61, 62, 63, 64, 65, 66 and the busbars 610, 6120, 6121, 6230, 6231, 6340, 6341, 6450, 6451, 6560, 6561, 660 formed by integral welding are fixed to the battery slot 7, and then connected to the Figure 8 The battery cover 10 shown is sealed with epoxy glue to isolate the cells 1, 2, 3, 4, 5, and 6 from each other; the battery cover 10 is provided with glue grooves at the corresponding positions of the buses 610, 6120, 6121, 6230, 6231, 6340, 6341, 6450, 6451, 6560, 6561, and 660, and all the buses are immersed in the epoxy glue to ensure that the cells are sealed without leakage.

[0047] Furthermore, the sealed dry cell undergoes conventional battery production operations: acid filling, charging, cleaning, installing a vent valve, sealing the cover, coding, and storage.

[0048] Example 2

[0049] The single grid of Example 1 is arranged in 1x6, and the single grid of Example 2 is arranged in 2x3. The implementation process is exactly the same as that of Example 1 and will not be repeated here.

[0050] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A battery with a mother-child bipolar plate, characterized in that: It includes a sub-pole ear, a mother pole ear and a grid. The sub-pole ear is narrow and far away from the center line of the grid, the mother pole ear is wide and close to the center line of the grid, and the sub-pole and mother pole ears are respectively located on both sides of the center line of the grid; the ratio of the width of the sub-pole ear to the mother pole ear is the same as the ratio of the distance from the center of the sub-pole ear and the center of the mother pole ear to the center of the grid.

2. A battery with a parent-child bipolar tab plate according to claim 1, characterized in that: The difference between the distance from the inner side of the sub-pole ear to the center line of the grid and the distance from the outer side of the mother pole ear to the center line of the grid is in the range of 2-100mm, and the distance from the inner side of the mother pole ear to the center line of the plate is in the range of 6-100mm.

3. The battery with parent-child bipolar tab plates according to claim 1, characterized in that: After coating the plates, positive and negative active materials are coated respectively to obtain a mother-and-child bipolar ear positive electrode plate and a mother-and-child bipolar ear negative electrode plate, which are assembled into a pole group in sequence with a separator. The pole group is characterized in that: the mother-and-child bipolar ear positive electrode plate and the mother-and-child bipolar ear negative electrode plate are separated by separators in sequence, the sub-electrode ears of the mother-and-child bipolar ear positive electrode plate and the sub-electrode ears of the mother-and-child bipolar ear negative electrode plate are separated on both sides, and the mother-electrode ears of the mother-and-child bipolar ear positive electrode plate and the mother-electrode ears of the mother-and-child bipolar ear negative electrode plate are close to the middle.

4. A battery with a parent-child bipolar tab plate according to claim 3, characterized in that: For different cells placed in the battery slot, the pole groups of any adjacent cells are rotated 180 degrees with each other, the positive sub-pole ear of the previous cell and the negative sub-pole ear of the next cell are located in the same area, the positive mother pole ear of the previous cell and the negative mother pole ear of the next cell are located in the same area, the negative sub-pole ear of the previous cell and the positive sub-pole ear of the next cell are located in the same area, and the negative mother pole ear of the previous cell and the positive mother pole ear of the next cell are located in the same area.

5. A battery with a mother-child bipolar tab plate according to claim 4, characterized in that: The different single-cell electrode groups placed in the battery slot, the positive electrode mother and daughter pole ears and the positive terminal of the first single cell are welded together as the positive electrode of the battery lead-out terminal; the negative electrode mother pole ear of the first single cell and the positive electrode mother pole ear of the second single cell, the negative electrode son pole ear of the first single cell and the positive electrode son pole ear of the second single cell are welded together to realize the series connection of the first single-cell electrode group and the second single-cell electrode group; the positive electrode mother pole ear of the second single cell and the negative electrode mother pole ear of the third single cell, the positive electrode son pole ear of the second single cell and the negative electrode son pole ear of the third single cell are welded together to realize the series connection of the second single-cell electrode group and the third single-cell electrode group, and so on, the negative electrode mother and daughter pole ears and the negative terminal of the last single cell are welded together as the negative electrode of the battery lead-out terminal.

6. A battery with a parent-child bipolar tab plate according to claim 5, characterized in that: All the parent and child pole ears of the pole group extend out of the pole plate at the same height, the bus bars do not cross each other, all welding actions can be completed simultaneously in a pair of welding molds, and all bus bars can be formed simultaneously.

7. A battery with a parent-child bipolar tab plate according to claim 4, characterized in that: The two ends of the battery slot extend a distance to accommodate the positive bus bar and the negative bus bar, and the slot wall is provided with reinforcing ribs 5-15 mm high.

8. The battery with parent-child bipolar tab plates according to claim 6, characterized in that: The battery cover of the battery slot is provided with glue grooves at positions corresponding to the busbars, epoxy glue is injected into the glue grooves, and all the busbars are immersed in the epoxy glue.

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