A front-terminal vertical wide-tab direct-connected bipolar lead-acid battery and its assembly method

Abstract

The present invention discloses a front-terminal vertical wide-tab direct-connected bipolar lead-acid battery and an assembly method thereof. Specifically, a new battery structure is proposed, in which the busbars between the single compartments in a conventional battery are removed, and the connection between the single compartments is replaced by a bipolar plate connection method. The plates and separators are stacked horizontally into a battery slot layer by layer in a specific arrangement order, the tabs are widened, and a row of holes are punched in the middle of the tabs of the bipolar plates. After the lamination is completed, metal rods are inserted into the holes to connect the pole groups and tabs in parallel, the pole groups are locked with a pressing plate, and each monomer is sealed by glue injection. The two halves are then bonded into a whole by glue sealing or heat sealing, and the battery is turned into an upright state. The busbars at the turning points are welded, the terminals are welded, and the side covers are sealed to complete the battery assembly. This structure can greatly improve the high-current and high-rate discharge performance of the battery, and effectively solve the high-rate discharge and assembly problems of lead-acid batteries, providing key support for technological innovation, performance breakthroughs and market expansion of lead-acid batteries.

Description

Technical Field

[0001] The present invention relates to the field of lead-acid batteries, in particular to a front-terminal vertical wide-tab direct-connected bipolar lead-acid battery and an assembly method thereof. Background Art

[0002] Conventional lead-acid battery cells require the internal electrode groups and tabs to be connected via a busbar, and then the cells are connected via bridge or through-wall welding. This results in long connection distances and a small connection area. This leads to significant voltage loss and heat generation at the connection points during high-current, high-rate discharge. As battery usage scenarios evolve, user requirements for ultra-high-rate discharge are increasing, from 1C and 3C discharge rates to 5C discharge rates. This requires urgent improvement in ultra-high-rate discharge performance.

[0003] Patent document CN117219930A discloses a horizontal bipolar lead-acid battery, which uses seals and transverse baffles to separate the battery electrode groups to form an isolated and sealed space to prevent acid and gas leakage between cells, thereby avoiding the battery being in a state of cell leakage that causes different internal reactions during storage or charging and discharging. However, the plates are fixed in the slots, and the length and height of the battery cannot be adjusted according to actual needs to meet the requirements of different application scenarios. At the same time, during the assembly process of the battery with this structure, when injecting glue to fix the electrode group, the glue can easily enter the electrode plates of the electrode group, affecting the battery performance.

[0004] Patent document CN113611919A discloses a horizontal lead-acid battery technology field, specifically a bipolar horizontal lead-acid battery for starting. The bipolar horizontal lead-acid battery structure adopts bipolar plates, and the positive and negative plates of the plates are connected by grid ribs. The connected grid ribs replace the existing through-wall welding connection method between single cells, reducing the internal resistance and facilitating large current discharge. However, the battery is complicated to assemble and cannot be expanded, and cannot meet the application requirements of different scenarios.

[0005] Therefore, developing a lead-acid battery that can adapt to different large currents and different scenarios while assembling a simple lead-acid battery is currently a difficulty in the industry. Summary of the Invention

[0006] The purpose of the invention is to provide a lead-acid battery and an assembly method to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] On one hand, the present invention provides a front-terminal vertical wide-tab direct-connected bipolar lead-acid half-cell, the lead-acid battery comprising a battery trough and one or more horizontally placed battery pole groups sealed in the battery trough body, the battery trough being a rectangular structure, the battery trough being divided into multiple single compartments by multiple transverse partition walls, including side walls and a bottom surface, gaps for the battery pole groups to pass through are provided between the partition walls, the gaps can be arranged on the same side of the partition wall or staggered between two adjacent compartments, the vertical surface and the bottom of the gap are both provided with grooves for the sealing and positioning of the seal, the pole group It has a positive terminal, a negative terminal and a series part. The series part is a bipolar plate with positive and negative plate tabs directly connected. The bipolar plates in the series part are alternately stacked in the form of positive plates stacked on negative plates, and along the longitudinal direction; the positive terminal has a number of independent unipolar positive plates, the positive plates are stacked longitudinally, and the negative plate of the bipolar plate is stacked between two adjacent unipolar positive plates; the negative terminal has a number of independent unipolar negative plates, the negative plates are stacked longitudinally, and the positive plate of the bipolar plate is stacked between two adjacent unipolar negative plates; a sheet-like AGM separator is provided between adjacent positive plates and negative plates.

[0009] Furthermore, all unipolar positive plates at the positive end have outwardly extending positive pole tabs, and all unipolar negative plates at the negative end have outwardly extending negative pole tabs, the tabs are widened, and a row of hole structures is provided in the middle of the tabs of the bipolar plates.

[0010] Furthermore, the half-cell also includes multiple pressure plates, a card slot is provided at the upper end of the side wall of the battery slot, the pressure plate has a snap-on protrusion, the pressure plate presses the electrode group and locks the electrode group with the card slot through the protrusion, and the pressure plate and the single compartment are arranged in a one-to-one correspondence.

[0011] Furthermore, a row of fine ribs is designed on the side of the notch of the battery slot, and the distance between the plate frame and the ribs is slightly smaller than the thickness of the separator.

[0012] Furthermore, both ends of the battery container have openings for the positive and negative terminal tabs of the electrode group to pass through, and an outer rubber groove is provided on the outside of the opening to complete the sealing of the battery with the side cover; the side wall of the battery container includes at least one acid adding nozzle, and the acid adding nozzle is arranged in a one-to-one correspondence with the single compartment.

[0013] Furthermore, the inner wall of the battery container is hollowed out to form a recessed portion of a certain depth to accommodate a separator that is wider than the plate.

[0014] The present invention also provides a front-terminal vertical wide-tab direct-connected bipolar lead-acid battery, comprising at least two groups of lead-acid half-cells as described above, wherein the lead-acid half-side batteries are stacked and connected together along the direction of the pressure plate, and the openings at both ends of the lead-acid half-cells are sealed by a cover plate, and the tabs of the lead-acid half-cells are conductively connected to the positive and negative terminals in the cover plate.

[0015] Furthermore, half of the half-battery slot connection is designed as a concave inner glue groove, and the other half is designed as a raised glue sealing ridge, which are connected by a snap; and / or both sides of the half-battery slot connection have a raised structure that can be heat-sealed, which are connected by heat sealing.

[0016] Furthermore, outer rubber grooves are designed on the outside of the notches at both ends of the battery container, which cooperate with the cover plate to seal the battery.

[0017] The present invention also provides a method for preparing the above-mentioned front-terminal vertical wide-tab direct-connected bipolar lead-acid battery, characterized in that it comprises the following steps:

[0018] S1, first prepare a unipolar positive plate, a unipolar negative plate, and a bipolar plate with the positive and negative plate tabs directly connected;

[0019] S2, then stacking the unipolar plates, bipolar plates and sheet AGM separators into electrode groups in a special arrangement;

[0020] S3, after the electrode groups are stacked, they are loaded into the battery container. A pressing plate is then used to press the electrode groups and lock the electrode groups together with the slots on the upper end of the battery container sidewalls through the protrusions on the pressing plate. The gaps in the partition walls are sealed by injecting glue, and the pressing plate is also sealed to obtain a half-cell.

[0021] S4, stack and connect at least two groups of half-batteries along the direction of the pressure plate, then weld the conductive terminals, stick the side covers, inject glue into the side covers to seal the batteries, and apply colored glue at the positive and negative terminals to complete the battery assembly.

[0022] The present invention has the following beneficial effects:

[0023] (1) Innovative pole group design: The pole group integrates unipolar plates and positive and negative plates with directly connected bipolar plates. The series bipolar plates alternate in positive and negative directions and extend longitudinally, coordinating with the positive and negative independent unipolar plates to optimize the current conduction path, reduce internal resistance, reduce losses, and enhance rate discharge performance. The wide pole ear structure increases conductive contact and widens the pole ear. A row of holes is drilled in the middle of the pole ear of the bipolar plate. After the lamination is completed, a metal rod can be inserted into the hole to connect the pole group poles in parallel. The series and parallel connection mode of the pole pieces in the pole group can be flexibly changed to adapt to different scene requirements.

[0024] (2) Reliable tab connection: The internal cells of the battery are directly connected through the bipolar plate tabs. The connection of each piece can be visually checked during the manufacture of the bipolar plate, which has high reliability. In addition, the tabs are widened and have a large margin. Local welding defects do not affect the current conduction of the entire connection. This connection can avoid false welding that is easy to occur in conventional battery tab bus welding or cast welding. In addition, the tab connection parts are sealed in glue during battery assembly, and acid corrosion will not occur.

[0025] (3) Optimize the battery shell structure: The battery trough and partition wall form multiple single compartments with accommodating cavities. The openings at both ends are sealed with covers to facilitate assembly and maintenance of the plates and partitions. A row of fine ribs are designed on the side of the notch of the battery trough partition wall. The distance between the plate frame and the ribs is slightly smaller than the thickness of the partition. When stacking, the ribs bend the partition upwards, just filling the gap between the plate and the partition, preventing the glue from leaking to both sides during glue injection, ensuring structural stability and reliable electrical performance, extending service life, and making battery assembly more efficient.

[0026] (4) Efficient stacking process: Single and bipolar plates and AGM separators are stacked in a specific sequence to form electrode groups, ensuring close contact between the plates, smooth ion migration, and uniform electrolyte infiltration, providing efficient ion channels for electrochemical reactions, improving battery performance consistency and reliability, reducing the difficulty and cost of the production process, and increasing production efficiency and yield.

[0027] (5) Scalable packaging: By assembling at least two half-cells, this structure can be adapted to different scenarios according to the needs of the application scenario by increasing the number of plates and the number of half-cells, as well as connecting half-cells in series and parallel, and can greatly improve the battery's high-current and high-rate discharge performance. At the same time, after the left and right half-cells are assembled, they are upright and glued together to form a vertical structure. The vertical structure uses gravity to prevent the acid concentration from stratifying and causing plate voltage differences, ensuring uniform reaction of the upper and lower plates, improving battery performance stability, extending cycle life, and ensuring power supply quality and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a unipolar wide-ear plate.

[0030] Figure 2 It is a bipolar wide-ear plate.

[0031] Figure 3It is a sheet-like AGM separator.

[0032] Figure 4 This is a schematic diagram of the arrangement of bipolar battery plates with vertical wide tabs directly connected to the front terminals.

[0033] Figure 5 This is a top view of the right battery slot of a front-terminal vertical wide-tab direct-connect bipolar battery.

[0034] Figure 6 This is a 3D view of the right battery slot of a front-terminal vertical wide-tab direct-connect bipolar battery.

[0035] Figure 7 This is a 3D view of the left battery slot of a front-terminal vertical wide-tab direct-connect bipolar battery.

[0036] Figure 8 It is a front terminal vertical wide tab directly connected to the bipolar battery pole group pressure plate.

[0037] Figure 9 It is the side cover at the corner of the front terminal vertical wide tab direct-connected bipolar battery.

[0038] Figure 10 It is the side cover of the front terminal vertical wide tab direct-connected bipolar battery terminal.

[0039] Figure 11 This is the right side package diagram of the front terminal vertical wide tab direct-connected bipolar battery.

[0040] Figure 12 This is the left side package diagram of the front terminal vertical wide-tab direct-connected bipolar battery.

[0041] Figure 13 This is the combined left and right packaging diagram of a front-terminal vertical wide-tab direct-connect bipolar battery.

[0042] Figure 14 This is an exploded view of a front-terminal vertical wide-tab direct-connect bipolar battery.

[0043] Figure 15 This is the appearance diagram of a front-terminal vertical wide-tab direct-connect bipolar battery.

[0044] In the figure: 1. groove; 2. notch; 3. rib; 4. slot; 5. recessed portion; 6. inner rubber groove; 7. outer rubber groove; 8. convex edge; 9. pressure plate; 10. pole group; 11. seal. DETAILED DESCRIPTION

[0045] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0046] It will be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0047] To simplify the drawings, only the parts relevant to the present invention are schematically shown in each figure. They do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. As used herein, "one" not only means "only one" but also "more than one."

[0048] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0049] In the embodiments shown in the accompanying drawings, directional indications (such as up, down, left, right, front, and rear) used to explain the structure and movement of various components of the present invention are not absolute but relative. These descriptions are applicable when the components are in the positions shown in the accompanying drawings. If the descriptions of the positions of these components are changed, the directional indications will also change accordingly.

[0050] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other embodiments can be obtained based on these drawings without inventive work.

[0052] See also Figure 1-2 In the embodiment of the present invention, the battery plates are designed into two types, the first type is a unipolar plate ( Figure 1 ), the second is a bipolar plate with positive and negative plate tabs directly connected ( Figure 2 ), the main shapes and sizes of the various plates are the same, but the tab connection methods are different. To enhance high-rate discharge performance, the tabs are designed with wide tabs. To achieve parallel connection of groups of tabs, the tabs are widened, and a row of holes are drilled in the middle of the tabs of the bipolar plate. After the lamination is completed, metal rods are inserted into the holes to connect the groups of tabs in parallel.

[0053] Bipolar plates can be made by joining the tabs of conventional positive and negative plates via welding or laser welding, or by using a bipolar plate coating machine to coat both the positive and negative electrodes simultaneously. Grids can be gravity cast or punched with lead strips. Unipolar plates are made by coating the active material onto the grid. The grid can be conventional cast, punched with lead strips, stretched mesh, or woven with lead wire.

[0054] Grids can be made of pure lead, lead-calcium alloy, lead-antimony alloy, or lead-tin alloy. Grid thickness varies depending on the battery type and intended use. Generally speaking, the grid thickness of lead-acid batteries used in automotive starting batteries is relatively thin, typically between 1.5 and 3.0 mm. This is because automotive starting batteries primarily need to provide high currents in a short period of time, placing certain weight and cost requirements on the grid. For lead-acid batteries used for energy storage, the grid thickness may reach 3.0-5.0 mm or even thicker. Energy storage batteries require long charge and discharge cycles, and thicker grids provide better mechanical support and conductivity, ensuring stable battery performance over extended use. Grid size depends on the battery's capacity and design. Generally speaking, the length and width of the grid vary widely, ranging from a few centimeters to several tens of centimeters. For example, the grid size of a small sealed lead-acid battery (such as a common UPS backup power battery) may be relatively small, ranging from 5-15 cm in length and 3-10 cm in width. However, the grid size of a large industrial energy storage lead-acid battery is larger, ranging from 50-100 cm in length and 20-50 cm in width. The grid size design must comprehensively consider factors such as the internal space layout of the battery, the amount of active material filled, and the battery's electrical performance requirements.

[0055] Figure 3 This is a schematic diagram of an AGM separator. This sheet-like structure is primarily composed of ultrafine glass fibers. Glass fibers are chemically stable and remain stable in the acidic electrolyte environment of lead-acid batteries, resisting chemical reactions with sulfuric acid. Furthermore, their high mechanical strength provides excellent support for the plates during charge and discharge, preventing deformation and loss of active material. Their microstructure, a three-dimensional mesh, allows the glass fibers to effectively absorb and retain electrolyte, ensuring smooth ion conduction paths within the battery.

[0056] To further optimize the performance of AGM separators, a small amount of binder is sometimes added. This binder helps bind the glass fibers together, improving the separator's integrity and mechanical strength while maintaining its pore structure and electrolyte absorption capacity. Hydrophobic agents may also be added to adjust the separator's electrolyte absorption and retention properties, preventing excessive electrolyte loss or, in some cases, electrolyte accumulation leading to local short circuits.

[0057] The thickness of AGM separators is generally between 0.5-3mm. For some small lead-acid batteries, such as motorcycle starting batteries, thinner AGM separators with a thickness of around 0.5-1mm may be selected to reduce the battery volume while meeting the basic requirements for battery performance.

[0058] For large energy storage lead-acid batteries or car starting batteries, in order to ensure better electrolyte adsorption and ion conductivity, as well as stronger plate support capabilities, thicker AGM separators are selected, usually with a thickness of 1.5-3mm.

[0059] Figure 4 This is the electrode group stacking method in this embodiment. The electrode group has a positive terminal, a negative terminal, and bipolar plates with positive and negative plate tabs directly connected. The bipolar plates are alternately stacked in a manner of positive plates superimposed on negative plates and extend in the longitudinal direction. The positive terminal consists of three independent unipolar positive plates, which are stacked longitudinally, and the negative plate of the bipolar plate is stacked between two adjacent positive plates. The negative terminal has three independent unipolar negative plates, which are stacked longitudinally, and the positive plate of the bipolar plate is stacked between two adjacent unipolar negative plates. A sheet-like AGM separator is provided between adjacent positive and negative plates. As a preferred embodiment, the electrode group stacking method can be extended longitudinally and / or transversely according to experimental needs.

[0060] Figure 5-7 This is a structural diagram of the battery slot of this embodiment. It can be seen that the battery slot is a rectangular structure. The side wall of the battery slot is designed with a card slot 4. The battery slot is divided into multiple single compartments by multiple horizontal partition walls, including side walls and a bottom surface. Gaps are provided between the partition walls for the battery pole groups to pass through. The gaps can be arranged on the same side of the partition wall, or staggered between two adjacent grids to enhance the strength of the battery slot gap and avoid the direction of the force caused by the growth of the plate. In order to enhance the sealing effect at the gap 2 of the battery slot, grooves 1 are designed on the vertical surface and the bottom of the gap to increase the sealing interface distance. A row of small ribs 3 are designed on the side of the battery slot gap. The distance between the plate frame and the rib is slightly smaller than the thickness of the partition. When stacking, the rib bends the partition upward to just fill the gap between the plate and the partition to prevent the glue from leaking to both sides when injecting glue. The inner wall of the battery container is hollowed out to form a recessed portion 5 of a certain depth to accommodate a partition wider than the plate, thereby reducing the risk of short circuit and increasing the space for the plate to grow, thereby extending the service life of the battery. At the connection between the left and right halves of the battery container, half is designed as a concave inner glue groove 6, and the other half is designed as a raised glue sealing ridge 8, which facilitates the installation of the two half batteries. At the same time, outer glue grooves 7 are designed on the outside of the notch at both ends of the battery container to cooperate with the cover plate to seal the battery. The side wall of the battery container includes at least one acid adding nozzle, which is arranged in a one-to-one correspondence with the single partition.

[0061] Figure 8It is a front terminal vertical wide tab direct-connected bipolar battery pole group pressure plate. A buckle protrusion is designed at the corresponding card slot position of the pressure plate 9 to lock the pole group pressure. After the stacking is completed, the pressure plate is used to press the pole group and lock it through the protrusion 9.

[0062] Figure 9-15 It is the package cover and package structure diagram of the battery pack, through Figure 11-12 It can be seen that the electrode group 10 is installed in the battery container, and the individual electrode plates are separated by the single partitions in the battery container and fixed by the seal 11. The seal 11 is formed by injection molding. It should be noted that when the battery is assembled, a certain amount of epoxy sealant is injected into the groove 1 to form the seal 11, thereby completing the partial sealing of the electrode group. Each single partition forms an independent sealed chamber. The two half-cells can be set in parallel or series according to the needs of the experiment. Figure 13 The two half batteries are connected in series, with the tabs on the same side, which are the positive and negative terminals of the two half batteries respectively. The outside of the notch at both ends of the battery tank is designed with a glue groove 7. The positive and negative tabs at the ends of the two half batteries are connected in series through a bus bar. The front ends of the two half batteries are respectively welded with the positive and negative terminals, and a corresponding end bus bar side cover is designed ( Figure 9 ) and front terminal side cover ( Figure 10 ), in this embodiment, after the two busbars and terminals are welded to the tabs, the side cover is glued on, and finally the space inside the side cover is filled with glue to seal the busbar in the glue. In this embodiment, the battery terminals are on the terminal side cover at the front end of the battery pack, through Figure 10 It can be seen that the front terminal side cover has an opening for accommodating the terminals. Figure 15 This is a picture of the final assembled battery pack. It can be seen that the battery is in an upright position. The advantage of the vertical structure is that it can avoid the difference in voltage between the upper and lower plates due to stratification of acid concentration.

[0063] This embodiment also specifically provides a method for assembling the above-mentioned battery, and the specific steps are:

[0064] Step 1: First, prepare a unipolar positive plate, a unipolar negative plate, and a bipolar plate with the positive and negative plate tabs directly connected;

[0065] Step 2: Then stack the unipolar plates, bipolar plates and sheet AGM separators into a pole group in a special arrangement; the plate assembly order is: the bottom layer is the separator, the first and second layers of plates are arranged in a special way. Figure 4 Arranged in a way that the positive and negative electrodes of two layers of plates face each other, with a separator layer between the two layers of plates. The two layers of separators and two layers of plates form a basic bipolar unit. Multiple units are stacked layer by layer until the required number of layers is reached to complete the assembly of the final electrode group.

[0066] S3, after the electrode groups are stacked, they are loaded into the battery container. A pressing plate is then used to press the electrode groups and lock the electrode groups with the slots on the upper end of the battery container side walls through the protrusions on the pressing plate. This secures the electrode groups to the battery container. Glue is then injected into the grooves of the partition walls to seal the gaps, and the pressing plate is also sealed to obtain a half-cell.

[0067] S4, stack and connect the two groups of half-batteries along the direction of the pressure plate, connect the two half-batteries in series, and then weld the tabs at one end of the battery pack to the busbar, and weld the tabs at the other end to the terminals. After welding, stick on the side cover. The outer edge of the side cover has a protrusion, and the protrusion on the side cover fits and snaps together with the outer groove on the outside of the battery slot opening. Then inject glue into the side cover to seal the battery. Finally, apply colored glue at the positive and negative terminals to complete the battery assembly.

[0068] The embodiments described above are some, but not all, of the embodiments of the present invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

Claims

1. A front terminal vertical wide tab direct-connected bipolar lead-acid battery, characterized in that: The battery pack comprises at least two groups of lead-acid half-cells, each of which comprises a plurality of pressing plates, and the lead-acid half-cells are stacked and connected together along the pressing plate direction, and both ends of the lead-acid half-cells have openings for the pole ears to pass through, and the openings are sealed by a cover plate, and the pole ears of the lead-acid half-cells are conductively connected to the positive and negative terminals in the cover plate; the lead-acid half-cell comprises a battery container and one or more horizontally placed battery pole groups sealed in the battery container body, the battery container is a rectangular structure, and the battery container is divided into a plurality of single compartments by a plurality of transverse partition walls, including side walls and a bottom surface, and gaps for the passage of the battery pole groups are provided between the partition walls, and the gaps can be arranged on the same side of the partition wall or staggered between two adjacent compartments, and the vertical surface and the bottom of the gap are both provided with grooves for sealing and positioning of the seal, the pole group has a positive terminal, a negative terminal and a series portion, and the series portion is a double-layer structure in which the positive and negative plate pole ears are directly connected Polar plates, the bipolar plates in the series part are alternately stacked in the form of positive plates superimposed on negative plates, and extend in the longitudinal direction; the positive end has a plurality of independent unipolar positive plates, the positive plates are stacked longitudinally, and the negative plate of the bipolar plate is stacked between two adjacent unipolar positive plates; the negative end has a plurality of independent unipolar negative plates, the negative plates are stacked longitudinally, and the positive plate of the bipolar plate is stacked between two adjacent unipolar negative plates; a sheet-like AGM separator is provided between adjacent positive plates and negative plates; a row of hole structures is provided in the middle of the pole ears of the bipolar plates, and a row of fine ribs are designed on the side of the notch of the battery slot, and the distance between the plate frame and the ribs is slightly less than the thickness of the separator; half of the half-battery slot connection is designed as a concave inner glue groove, and the other half is designed as a raised glue sealing ridge, which is connected by a snap; and / or both sides of the half-battery slot connection have a raised structure that can be heat-sealed, which is connected by heat sealing.

2. The lead-acid battery according to claim 1, characterized in that All the unipolar positive plates at the positive terminal have outwardly extending positive electrode tabs, and all the unipolar negative plates at the negative terminal have outwardly extending negative electrode tabs, and the tabs are widened.

3. The lead-acid battery according to claim 1, characterized in that A card slot is provided at the upper end of the side wall of the battery container, and the pressure plate has a buckle protrusion. The pressure plate presses the electrode group and locks the electrode group with the card slot through the protrusion.

4. The lead-acid battery according to claim 1, wherein An outer glue groove is provided on the outer side of the opening; the side wall of the battery container includes at least one acid adding nozzle, and the acid adding nozzle is provided in a one-to-one correspondence with the single partition.

5. The lead-acid battery according to any one of claims 1 to 4, characterized in that: The inner wall of the battery container has a recessed portion that is hollowed out to a certain depth to accommodate a separator that is wider than the plate.

6. The lead-acid battery according to claim 5, characterized in that The outside of the notches at both ends of the battery container are designed with outer glue grooves, which cooperate with the cover plate to seal the battery.

7. A method for preparing a battery according to any one of claims 1 to 6, characterized in that: The steps include: S1, first prepare a unipolar positive plate, a unipolar negative plate, and a bipolar plate with the positive and negative plate tabs directly connected; S2, then stacking the unipolar plates, bipolar plates and sheet AGM separators into electrode groups in a special arrangement; S3, after the electrode groups are stacked, they are loaded into the battery container. A pressing plate is then used to press the electrode groups and lock the electrode groups together with the slots on the upper end of the battery container sidewalls through the protrusions on the pressing plate. The gaps in the partition walls are sealed by injecting glue, and the pressing plate is also sealed to obtain a half-cell. S4, stack and connect at least two groups of half-batteries along the direction of the pressure plate, then weld the conductive terminals, stick the side covers, inject glue into the side covers to seal the batteries, and apply colored glue at the positive and negative terminals to complete the battery assembly.

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