Front terminal vertical wide tab direct-connection bipolar lead-acid battery and assembly method thereof

Abstract

The invention discloses a front terminal vertical wide tab direct-connection bipolar lead-acid battery and an assembly method thereof, and particularly provides a novel battery structure, a busbar between single partitions in a conventional battery is removed, and the connection between the single partitions is replaced by a bipolar pole plate connection mode; the polar plates and the partition plates are horizontally stacked into a battery jar layer by layer according to a specific arrangement sequence, tabs are widened, a row of holes are punched in the middles of the tabs of the bipolar polar plates, metal rods are inserted into the holes to enable the tabs of a polar group to be connected in parallel after lamination is completed, the polar group is locked by a pressing plate, and each monomer is sealed through glue injection. Then the two half parts are bonded into a whole through glue sealing or heat sealing, the battery is turned to be in a vertical state, then a busbar at the turning position is welded, a terminal is welded, a side cover is sealed, and battery assembling is completed; according to the structure, the large-current high-rate discharge performance of the battery can be greatly improved, the problems of high-rate discharge and assembly of the lead-acid battery are effectively solved, and a key support is provided for technical innovation, performance spanning and market expansion of the lead-acid battery.

Description

Technical Field

[0001] The 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] The pole groups and tabs inside conventional lead-acid battery cells need to be connected through a busbar, and the cells are then connected by bridge or through-wall welding. The connection distance is long and the connection area is small. When the battery is discharged at a high current and high rate, the voltage loss at the connection part is large, and the heat is high. With the development of battery usage scenarios, users have higher and higher requirements for ultra-high rate discharge of batteries, from the original 1C discharge and 3C discharge to 5C discharge. The ultra-high rate discharge performance of batteries needs to be improved urgently.

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

[0004] Patent document CN113611919A discloses a technical field of horizontal lead-acid batteries, 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 bars. The connected grid bars replace the existing through-wall welding connection method between single cells, which reduces the internal resistance and is conducive to 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 a difficulty in the current industry. Summary of the invention

[0006] The object 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 pole ear direct-connected bipolar lead-acid half-cell, the lead-acid battery comprising a battery slot and one or more horizontally placed battery pole groups sealed and arranged in the battery slot body, the battery slot is a rectangular structure, the battery slot is divided into multiple single compartments by multiple transverse partition walls, including side walls and a bottom surface, and 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 compartments, the vertical surface and the bottom of the gap are both provided with grooves for sealing and positioning 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 ears directly connected, the bipolar plates in the series part are alternately stacked in the manner of positive plates stacked on negative plates, and along the longitudinal direction; the positive terminal 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 terminal 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 arranged between adjacent positive plates and negative plates.

[0009] Furthermore, all the unipolar positive plates in the positive terminal have positive pole ears extending outward, and all the unipolar negative plates in the negative terminal have negative pole ears extending outward. The ears are widened, and a row of hole structures is provided in the middle of the ears of the bipolar plates.

[0010] Furthermore, the half-cell also includes a plurality of pressure plates, a card slot is provided at the upper end of the side wall of the battery slot, 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, 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 partition.

[0012] Furthermore, both ends of the battery container have openings for the positive terminal 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 one-to-one 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 electrode 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 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.

[0016] Furthermore, outer rubber grooves are designed on the outside of the notches at both ends of the battery slot to 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 preparing a unipolar positive electrode plate, a unipolar negative electrode plate and a bipolar electrode plate in which the positive and negative electrode tabs are directly connected;

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

[0020] S3, after the electrode groups are stacked, they are loaded into the battery slot, and then a pressing plate is used to press the electrode groups and lock the electrode groups through the protrusions on the pressing plate and the slots on the upper end of the battery slot side walls, so that the electrode groups are fixed to the battery slot, and the gaps in the partition walls are sealed by glue injection, and the pressing plate is also sealed to obtain a half-cell;

[0021] S4, stack and connect at least two groups of half-cells along the direction of the pressure plate, then weld the conductive terminals, glue the side cover, inject glue into the side cover to seal the battery, 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 the unipolar plate and the positive and negative plate tabs directly connected to the bipolar plate. The bipolar plates in the series are alternately positive and negative and extend longitudinally, coordinating 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 tab structure increases the conductive contact, the tabs are widened, and a row of holes is punched in the middle of the tabs of the bipolar plate. After the stacking is completed, a metal rod can be inserted into the hole to connect the pole group tabs in parallel. The series and parallel connection mode of the poles 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 prone 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 slot and partition wall form multiple single compartments with accommodating cavities, and 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 slot 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 to fill the gap between the plate and the partition, preventing the glue from leaking to both sides when injecting glue, 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 rate.

[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 the 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 bonded together to form a vertical structure. The vertical structure uses gravity to prevent the acid concentration from stratifying and causing the plate voltage difference, ensuring that the upper and lower plates react evenly, improving the stability of battery performance, extending the cycle life, and ensuring the quality and reliability of power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying 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 3D view of the right battery slot of a front-terminal vertical wide-tab direct-connect bipolar battery.

[0035] Figure 7 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 pole ear directly connected to the bipolar battery pole group pressure plate.

[0037] Fig. 9 It is the side cover at the bend of the front terminal vertical wide pole ear direct-connected bipolar battery.

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

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

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

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

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

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

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

[0045] The specific implementation of the present invention is further described in detail below in conjunction with 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 should 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 exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0047] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

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

[0049] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of the various components of the present invention are not absolute but relative. These descriptions are appropriate when these components are in the positions shown in the drawings. If the description of the positions of these components changes, the indications of these directions 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 implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative 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 various plates are the same, but the connection methods of the tabs are different. In order to enhance the high-rate discharge performance, the tabs are designed to be wide tab structures. In order to achieve parallel connection of the tabs of the pole groups, the tabs are widened, and a row of holes are punched in the middle of the tabs of the bipolar plate. After the stacking is completed, a metal rod is inserted into the hole to connect the tabs of the pole groups in parallel.

[0053] The bipolar plate can be made by connecting the tabs of the conventional positive and negative plates by welding or laser welding, or by using a bipolar plate coating machine to coat the positive and negative electrodes at the same time. The grid can be a gravity cast grid or a lead belt punching grid; the monopolar plate is prepared by coating the active material on the grid; the grid can be a conventional cast grid, a lead belt punching grid or a wire mesh grid, or a lead wire mesh grid.

[0054] The material of the grid can be pure lead, lead-calcium alloy, lead-antimony alloy, lead-tin alloy, and the thickness of the grid varies according to the type and purpose of the battery. Generally speaking, the grid thickness of lead-acid batteries for automotive starters is relatively thin, usually between 1.5-3.0mm. This is because automotive starter batteries mainly need to provide large currents in a short period of time, and have certain requirements for the weight and cost of the grid. For lead-acid batteries for energy storage, the grid thickness may reach 3.0-5.0mm or even thicker. Energy storage batteries require long charge and discharge cycles, and thicker grids can provide better mechanical support and conductivity to ensure stable performance of the battery during long-term use. The size of the grid depends on the capacity and design of the battery. Generally speaking, the length and width of the grid range widely, ranging from a few centimeters to 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 small, with a length of 5-15cm and a width of 3-10cm; while the grid size of a large industrial energy storage lead-acid battery is larger, with a length of 50-100cm and a width of 20-50cm. The grid size design needs to comprehensively consider factors such as the internal space layout of the battery, the filling amount of active materials, and the electrical performance requirements of the battery.

[0055] Figure 3 This is a schematic diagram of an AGM separator. It is a sheet-like structure. The AGM separator is mainly composed of ultra-fine glass fibers. Glass fibers have high chemical stability and can remain stable in the acidic electrolyte environment of lead-acid batteries without chemically reacting with sulfuric acid. At the same time, glass fibers have high mechanical strength and can provide good support for the plates during battery charging and discharging, preventing deformation of the plates and the shedding of active substances. Its microstructure is a three-dimensional mesh, which enables the glass fibers to absorb and retain the electrolyte well, ensuring smooth ion conduction paths inside the battery.

[0056] In order to further optimize the performance of AGM separators, a small amount of binder is sometimes added. The binder can better bind the glass fibers together, improve the integrity and mechanical strength of the separator, while not affecting its pore structure and electrolyte adsorption capacity. In addition, some hydrophobic agents may be added. The hydrophobic agent can adjust the absorption and retention characteristics of the separator for electrolyte, preventing excessive loss of electrolyte or, in some cases, local short circuits caused by electrolyte aggregation.

[0057] The thickness of AGM separator is generally between 0.5-3mm. For some small lead-acid batteries, such as motorcycle starter batteries, thinner AGM separators with a thickness of about 0.5-1mm may be selected to reduce the battery volume while meeting their 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 The electrode group stacking method in this embodiment includes a positive terminal, a negative terminal and a bipolar plate with positive and negative plate ears directly connected, and the bipolar plates are alternately stacked in a manner of positive plates stacked on negative plates, and extend in the longitudinal direction; the positive terminal includes three independent unipolar positive plates, the positive plates are stacked longitudinally, and the negative plate of the bipolar plate is stacked between two adjacent positive plates; the negative terminal includes three 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 arranged between adjacent positive plates and negative plates; as a preferred embodiment, the electrode group stacking method can be extended longitudinally and / or transversely according to the needs of the experiment;

[0060] Figure 5-7 It 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 partitions, including side walls and a bottom surface. Gaps for the battery pole groups to pass through are arranged between the partition walls. 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 fine ribs 3 are designed on the side of the gap of the battery slot. 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 slot is hollowed out to a certain depth of a recessed portion 5 to accommodate a partition wider than the plate, thereby reducing the risk of short circuits and increasing the space for the plate to grow, thereby extending the battery life. At the connection between the left and right halves of the battery slot, one half is designed as a concave inner glue groove 6, and the other half is designed as a raised glue sealing ridge 8, so that the two half batteries can be easily installed. At the same time, outer glue grooves 7 are designed on the outside of the notches at both ends of the battery slot to cooperate with the cover plate to seal the battery. The side wall of the battery slot includes at least one acid adding nozzle, and the acid adding nozzle is arranged in a one-to-one correspondence with the single partition.

[0061] Figure 8It is a bipolar battery pole group pressing plate with a vertical wide pole ear directly connected to the front terminal. A buckle protrusion is designed at the corresponding card slot position of the pressing plate 9 to lock the pole group pressure. After the stacking is completed, the pole group is pressed tightly with the pressing plate and locked by the protrusion 9.

[0062] Figure 9-15 It is the packaging cover and packaging structure diagram of the battery pack. Figure 11-12 It can be seen that the electrode group 10 is installed in the battery slot, and the single electrode plate is separated by a single partition in the battery slot and fixed by a 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, and each single partition forms an independent sealed chamber. The two half-cells can be set in parallel or in series according to the needs of the experiment. It can be seen that Fig.13 The two half batteries are arranged in series, and the tabs of the two half batteries are 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 slot is designed with a glue slot 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 positive and negative terminals, and a corresponding end bus bar side cover is designed ( Fig. 9 ) and front terminal side cover ( Fig.10 ), in this embodiment, after the two busbars and the 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. The battery terminals in this embodiment are on the terminal side cover at the front end of the battery pack, through Fig.10 It can be seen that the front terminal side cover has an opening for accommodating the terminals. Fig.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 electrode plate, a unipolar negative electrode plate and a bipolar electrode plate in which the positive and negative electrode tabs are directly connected;

[0065] Step 2: Then stack the monopolar plates, bipolar plates and sheet AGM separators into a pole group in a special arrangement; the order of plate assembly is that the bottom layer is the separator, the first and second layers of plates are arranged in a certain order. Figure 4 Arranged in a way that the positive and negative electrodes of two layers of plates face each other, and there is 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, completing the assembly of the final electrode group.

[0066] S3, after the electrode groups are stacked, they are loaded into the battery slot, and then a pressing plate is used to press the electrode groups and lock the electrode groups through the protrusions on the pressing plate and the slots on the upper ends of the battery slot side walls, so that the electrode groups are fixed to the battery slot, and then glue is 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 two groups of half-batteries together along the direction of the pressure plate, connect the two half-batteries in series, and then weld the pole ear at one end of the battery pack to the bus bar, and weld the pole ear at the other end to the terminal. After welding, stick the side cover on. The outer edge of the side cover has a protrusion, and the protrusion on the side cover is snapped together with the outer groove on the outer side of the battery slot opening. Then inject glue into the side cover to seal the battery, and finally apply colored glue at the positive and negative terminals to complete the battery assembly.

[0068] The embodiments described above are part of the embodiments of the present invention, rather than all of the embodiments. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, 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.

Claims

1. A front terminal vertical wide tab direct-connected bipolar lead-acid half-battery, characterized in that: The lead-acid battery comprises a battery tank and one or more horizontally placed battery pole groups sealed in the battery tank body. The battery tank is a rectangular structure. The battery tank is divided into multiple single compartments by multiple transverse partition walls, including side walls and a bottom surface. A gap is 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 compartments. 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 connection portion. The series part is a bipolar plate in which the positive and negative plate ears are directly connected. The bipolar plates in the series part are alternately stacked in the manner of positive plates superimposed on negative plates, and along 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 arranged between adjacent positive plates and negative plates.

2. The lead-acid half-cell according to claim 1, characterized in that: All unipolar positive plates at the positive end have positive pole ears extending outward, and all unipolar negative plates at the negative end have negative pole ears extending outward. The ears are widened, and a row of hole structures is arranged in the middle of the ears of the bipolar plates.

3. The lead-acid half-cell according to claim 1 or 2, characterized in that: The half-cell further comprises a plurality of pressing plates, a clamping slot is arranged at the upper end of the side wall of the battery slot, the pressing plate has a buckle protrusion, the pressing plate presses the electrode group and locks the electrode group with the clamping slot through the protrusion.

4. The lead-acid half-cell according to claim 1, characterized in that: A row of fine convex ribs are designed on the side of the notch of the battery slot, and the distance between the plate frame and the convex ribs is slightly smaller than the thickness of the partition.

5. The lead-acid half-cell according to claim 1, characterized in that: The two ends of the battery container have openings for the positive terminal and negative terminal tabs of the electrode group to pass through, and an outer rubber groove is arranged outside the opening; the side wall of the battery container includes at least one acid adding nozzle, and the acid adding nozzle is arranged one-to-one corresponding to the single compartment.

6. The lead-acid half-cell according to any one of claims 1 to 5, 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.

7. A front terminal vertical wide tab direct-connected bipolar lead-acid battery, comprising at least two groups of lead-acid half-cells as described in any one of claims 1 to 6, 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.

8. The lead-acid battery according to claim 7, characterized in that: The half-battery slot connection is designed as a concave inner glue slot on one half and a raised glue-sealing ridge on the other half, which are connected by snap-fit; and / or both sides of the half-battery slot connection have heat-sealable raised structures, which are connected by heat sealing.

9. The lead-acid battery according to claim 7 or 8, characterized in that: The outer sides of the notches at both ends of the battery slot are designed with outer rubber grooves, which cooperate with the cover plate to seal the battery.

10. A method for preparing a battery according to any one of claims 7 to 9, characterized in that: The steps include: S1, first preparing a unipolar positive electrode plate, a unipolar negative electrode plate and a bipolar electrode plate in which the positive and negative electrode tabs are directly connected; S2, then stacking the monopolar plates, bipolar plates and sheet AGM separators into pole groups in a special arrangement; S3, after the electrode groups are stacked, they are loaded into the battery slot, and then a pressing plate is used to press the electrode groups and lock the electrode groups through the protrusions on the pressing plate and the slots on the upper end of the battery slot side walls, so that the electrode groups are fixed to the battery slot, and the gaps in the partition walls are sealed by glue injection, and the pressing plate is also sealed to obtain a half-cell; S4, stack and connect at least two groups of half-cells along the direction of the pressure plate, then weld the conductive terminals, glue the side cover, inject glue into the side cover to seal the battery, apply colored glue at the positive and negative terminals to complete the battery assembly.

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