Lead-acid storage battery

Abstract

The invention discloses a lead-acid storage battery, and belongs to the technical field of batteries. The lead-acid storage battery comprises a groove body with an opening at one end, a cover body matched with the groove body and a battery cell assembled in the groove body, the battery cell is formed by stacking soft package monomer battery cells, and a voltage regulating plate is arranged in the stacking direction of the soft package monomer battery cells. According to the invention, random combination of individual battery cells is realized through a flexible battery cell laminating and pressurizing structure, the pressure regulating plate is designed to assemble the balanced modular lead-acid battery with the battery cells capable of being pre-pressed, the wet pole group pressure is ensured to be greater than 20kPa and the wet-to-dry ratio is not less than 1: 1 in the use process of the lead-acid battery, the assembly pressure of each battery is regulated, and the assembly efficiency is improved. The group voltage is consistent when a plurality of batteries are grouped, and the cycle life of the whole group of batteries is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and specifically to a lead-acid battery. Background Art

[0002] Due to advantages such as high safety, low cost, and recyclable raw materials, lead-acid batteries are widely used in fields such as automobiles, electric bicycles, communications, and power systems. Especially in the electric bicycle industry, compared with lithium batteries, lead-acid batteries are safer, making them the mainstream power battery choice again in recent years.

[0003] However, the insufficient cycle life of lead-acid batteries severely restricts their further promotion. Research shows that one of the key factors affecting their life is the performance decay caused by the loss of assembly pressure in the middle and late stages of battery use. Lead-acid batteries mainly consist of positive and negative plates, separators, plastic cases, and electrolytes. Appropriate assembly pressure is conducive to the diffusion of battery electrolyte, ion exchange, reducing the expansion caused by the transformation of active substances, and water loss caused by increased internal resistance. The width of the battery case of traditional lead-acid batteries is fixed, and the separator will lose about 50% of the initial pressure due to characteristic limitations during the conversion from dry state to wet state. To compensate for the wet state pressure loss, a higher assembly pressure needs to be applied during dry state assembly, but this will pose higher requirements for equipment, production processes, and the pressure bearing of the battery plastic case, which is not conducive to efficient mass production and product competitiveness.

[0004] How to maintain a moderate assembly pressure in the dry state and flexibly regulate the internal group pressure of the finished battery in the wet state to increase the battery cycle life is the key research direction in the field of lead-acid batteries. Summary of the Invention

[0005] The purpose of the present invention is to provide a pressure-balanced modular lead-acid battery, which realizes dynamic pressure adaptation through a flexible battery cell layer stacking structure, solves the problems of increased battery internal resistance and aggravated water loss caused by fixed structure design, and increases the battery cycle life.

[0006] To solve the above technical problems, the present invention specifically provides the following technical solution: A lead-acid battery includes a trough with an open end, a cover body cooperating with the trough, and battery cells assembled inside the trough. The battery cells are composed of stacked soft-pack single battery cells, and the soft-pack single battery cell is a single battery cell sealed by a film. A pressure regulating plate is provided in the stacking direction of the soft-pack single battery cells, and the wet state pole group pressure is adjusted to be 20 kPa - 60 kPa. The present invention adopts the mode of battery cell + pressure regulating plate + outer shell to directly control and adjust the internal assembly pressure of the finished battery, that is, to maintain a moderate assembly pressure in the dry state and flexibly regulate the internal group pressure of the finished battery in the wet state, thereby making the battery conductivity and internal resistance controllable, reducing battery heating and loss, and realizing an increase in the battery cycle life.

[0007] The sum of the thicknesses of the compressed soft-pack single cells plus the thickness of the pressure-adjusting plate is equal to the inner width of the cell slot. Through the layer stacking and pressing structure of the flexible cells, the process pressure is ensured, and the ionic conductivity and internal resistance are reduced. According to the design, the thickness of a single cell after compression × the number of cells + the thickness of the pressure-adjusting plate = the inner width of the battery slot. To ensure that the group pressure conforms to the design, the pressure can be directly measured by a group pressure gauge. If there is a deviation, the pressure-adjusting plate can be adjusted to achieve the consistency of the group pressure. By adjusting the thickness and pressure of the pressure-adjusting plate, the direct control of the internal assembly pressure of the finished battery can be realized, ensuring that the wet-state pole group pressure is greater than 20 kPa and the wet-dry ratio is not less than 1:1.

[0008] The soft-pack single cell includes a pole group, the pole group is connected to a pole group encapsulation head, and an encapsulation bag is sleeved outside the pole group and the pole group encapsulation head. The soft-pack single cell is provided with a safety valve and a cover body which are cooperatively installed with the pole group encapsulation head to form a sealed structure. The soft-pack single cell of the present invention needs to have an independent pressure-holding mechanism. The safety valve is a one-way valve, which can not only isolate the external gas from entering the cell, but also relieve pressure when the internal pressure is too high to keep the internal air pressure stable. The sealed structure formed by the pole group encapsulation head and the safety valve can effectively prevent the leakage of the electrolyte and improve the safety of the battery; the encapsulation bag can isolate the pole group from the external environment, reduce the corrosion risk and extend the service life of the battery.

[0009] The pole group includes a positive plate, a negative plate, a separator and a pole column. When in use, the positive plate, the negative plate and the separator between them of the pole group are horizontally arranged, and the soft-pack single cells are longitudinally stacked. If the plates and the separator are horizontally placed, the acid on the same horizontal plane tends to be uniform, which can improve the utilization rate of the active material in the middle and lower parts of the original plate, thereby realizing the improvement of the battery capacity and the specific energy.

[0010] The material of the separator includes glass fiber, and the separator has elasticity. The separator is an AGM separator, and the AGM separator is a sheet structure formed by the cross-binding of a variety of ultra-fine glass fibers, which can maintain good contact between the separator and the plate. The separator has elasticity and maintains a certain pressure on the plate when absorbing the electrolyte. Since the separator is composed of glass fibers, the glass fibers will break brittlely and lose elasticity when the pressure is too high. Therefore, an appropriate pressure can ensure that the separator can maintain pressure on the plate in the wet state, reduce the risk of internal resistance increase and even active material shedding caused by the expansion of the active material, and avoid premature failure.

[0011] The soft-packed single cell is a 2V single cell. In order to improve the consistency of the battery, including the consistency of the process and the finished battery, the best way is to form a single cell and make it into an independent cell; the cell is then selected according to the discharge performance to form a battery with good consistency in capacity, voltage, internal resistance, etc. Preferably, the soft-packed single cells are electrically connected through a PCB board, and the PCB board welding method replaces the traditional battery overall lead casting welding method. The soft-packed single cells can be combined at will, that is, modularization is achieved, which makes it easy to select a battery with good capacity consistency according to the discharge performance, thereby improving the overall performance of the battery.

[0012] A method for preparing a lead-acid battery comprises the following steps: Production of soft-packed single cells, including casting, paste, coating, packaging and chemical forming processes; Stack multiple soft-pack single cells and fix them with buckles. After installing the voltage regulator board, use the group voltage meter to detect and adjust the group voltage to the target value. After the pole group is loaded into the tank, the series structure is welded, the voltage regulating plate is assembled, and the battery assembly is completed after packaging.

[0013] Among them, the formation process specifically includes: after the soft-packed single cell is assembled, it is poured into dilute sulfuric acid for formation, and after the formation is completed, it is graded according to the discharge performance to select the battery with good capacity consistency. The formation process is to form a single cell into an independent cell, and then the soft-packed single cell with good consistency is assembled into a battery, which can achieve lower ion conductivity and battery internal resistance, reduce battery heating and loss, and increase battery life. The assembly pressure of the lead-acid battery produced by the above steps can be adjusted, so that the battery conductivity and internal resistance can be controlled.

[0014] The beneficial effects of the present invention are as follows: the present invention realizes the arbitrary combination of individual cells through a flexible cell layer pressing structure, designs a voltage regulating plate to be assembled into a pre-pressurized balanced modular lead-acid battery, ensures that the wet pole group pressure of the lead-acid battery is greater than 20 kPa during use, and the wet-to-dry ratio is not less than 1:1, thereby maintaining a moderate assembly pressure in a dry state, and flexibly adjusting the internal group pressure of the finished battery in a wet state. During the use of the lead-acid battery, the stable and high pole group pressure can improve the charge acceptance capacity of the lead-acid battery, reduce the internal resistance of the lead-acid battery, improve the water loss process of the lead-acid battery, and extend its cycle life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the internal structure of the lead-acid battery of the present invention.

[0017] Figure 2 It is a schematic diagram of the soft-pack single cell of the present invention.

[0018] Figure 3 It is a schematic diagram of the structure of the soft-pack single cell described in the first embodiment.

[0019] Figure 4 It is the internal resistance test result of the lead-acid battery of the present invention and the traditional lead-acid battery.

[0020] Figure 5 It is the 100% DOD cycle test result of the lead-acid battery of the present invention and the traditional lead-acid battery.

[0021] Figure 6 It is the change curve of the group voltage with time during the charge and discharge process of the lead-acid battery of the present invention.

[0022] Figure 7 It is the microscopic structure of the separator described in the first embodiment.

[0023] Explanation of reference numerals: 1 - tank body; 2 - soft-pack single cell; 21 - positive plate; 22 - negative plate; 23 - separator; 24 - terminal post; 3 - PCB board. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] Next, the concepts involved in the present application will be described first in conjunction with the accompanying drawings. It should be noted here that the following descriptions of each concept are only for making the content of the present application easier to understand, and do not represent a limitation on the protection scope of the present application; at the same time, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Next, the present application will be described in detail with reference to the accompanying drawings and in conjunction with the embodiments.

[0026] First embodiment See Figures 1 to 3, a lead-acid battery, comprising a trough body 1 with an opening at one end, a cover body cooperating with the trough body 1, and an electric core assembled inside the trough body 1. The electric core is composed of laminated soft-pack single-cell electric cores 2, and a pressure regulating plate is provided in the lamination direction of the soft-pack single-cell electric cores 2. The present invention adopts the mode of electric core + pressure regulating plate + outer shell to realize direct controllability and adjustability of the internal assembly pressure of the finished battery, that is, to maintain a moderate assembly pressure in the dry state, and at the same time flexibly regulate the internal group pressure of the finished battery in the wet state, thereby making the battery conductivity and internal resistance controllable, reducing battery heating and loss, and increasing the battery cycle life.

[0027] The sum of the superposed thicknesses of the compressed soft-pack single-cell electric cores 2 and the thickness of the pressure regulating plate is equal to the inner width of the trough body 1. The flexible electric core ensures the process pressure through the lamination and pressing structure, reducing the ionic conductivity and internal resistance. According to the design, the thickness of a single compressed electric core × the number of electric cores + the thickness of the pressure regulating plate = the inner width of the battery trough. In order to ensure that the group pressure conforms to the design, the pressure can be directly measured by a group pressure gauge. If there is a deviation, the pressure regulating plate can be adjusted to achieve the consistency of the group pressure. By adjusting the thickness and pressure of the pressure regulating plate, the direct control of the internal assembly pressure of the finished battery can be realized, ensuring that the wet-state pole group pressure is greater than 20 kPa and the wet-dry ratio is not less than 1:1.

[0028] The soft-pack single-cell electric core 2 includes a pole group, the pole group is connected to a pole group encapsulation head, an encapsulation bag is sleeved outside the pole group and the pole group encapsulation head, and the soft-pack single-cell electric core 2 is provided with a safety valve and a cover body which are cooperatively installed with the pole group encapsulation head to form a sealed structure. The soft-pack single-cell electric core 2 of the present invention needs to have an independent pressure maintaining mechanism. The safety valve is a one-way valve, which can not only isolate external gas from entering the electric core, but also relieve pressure when the internal pressure is too high to keep the internal air pressure stable. The sealed structure formed by the pole group encapsulation head and the safety valve can effectively prevent electrolyte leakage and improve the battery safety; the encapsulation bag can isolate the pole group from the external environment, reduce the corrosion risk and extend the battery service life.

[0029] The pole group includes a positive plate 21, a negative plate 22, a separator 23 and a pole column 24. The positive plate 21, the negative plate 22 and the separator 23 therebetween in the pole group are horizontally arranged, and the soft-pack single-cell electric cores 2 are longitudinally laminated. If the plates and the separator are horizontally placed, the acid in the same horizontal plane tends to be consistent, which can improve the utilization rate of the active material in the middle and lower parts of the original plate, thereby realizing the improvement of the battery capacity and specific energy.

[0030] Preferably, the pressure regulating plates are fixed on both sides in the stacking direction of the battery cells. The adjustable thickness range of the pressure regulating plates is 1.0 mm - 5.0 mm (single layer), and it can be one of the following specific values or the range between any two of them: 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm. By regulating the pressure, the pressure of the wet electrode group is 20 kPa - 60 kPa, and specifically, it can be one of the following specific values or a value within the range between any two of them: 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60.

[0031] Specifically, when assembling a 24V battery, stack 12 battery cells and add pressure regulating plates on both sides, with the pressure regulating plates being 3 mm thick for each layer; when assembling a 12V battery, stack 6 battery cells and add pressure regulating plates on both sides, with the pressure regulating plates being 2 mm thick for each layer.

[0032] The soft-pack single battery cells 2 are freely combined into batteries with different voltages through electrical connection methods. To improve the battery consistency, including the consistency of the process and the finished battery, the best way is to perform single-cell formation on each cell to make independent cells; then, the cells are selected according to the discharge performance to form a battery with good capacity consistency. Preferably, the soft-pack single battery cells 2 are connected in series through the PCB board 3. The soft-pack single battery cells 2 are 2V single battery cells. The PCB board 3 combines the soft-pack single battery cells 2 with high consistency according to the electrical performance to improve the uniformity of the battery. Through the welding of the PCB board 3, the soft-pack single battery cells 2 can be combined arbitrarily, that is, modularized, which is convenient for selecting cells with good consistency in capacity, voltage, internal resistance, etc. according to the discharge performance to enhance the comprehensive performance of the battery.

[0033] A preparation method of a lead-acid battery includes the following steps: Produce soft-pack single battery cells, including processes such as casting plates, mixing pastes, coating plates, wrapping sheets, and formation. Stack and buckle-fix multiple soft-pack single battery cells, install the pressure regulating plates, and then detect and adjust the group pressure to the target value through a group pressure meter. Put the electrode group into the cell body and then weld the series structure, assemble the pressure regulating plates, and complete the battery assembly after encapsulation.

[0034] Among them, the formation process specifically includes: after the soft-pack single-cell battery is assembled, dilute sulfuric acid is poured in for formation. After the formation is completed, it is graded according to the discharge performance, and those with good capacity consistency are selected to form a battery. The formation process is to form a single-cell battery into an independent battery cell, and then form a battery with good consistency of soft-pack single-cell battery cells, which can achieve lower ionic conductivity and battery internal resistance, reduce battery heating and loss, and increase battery life. The assembly pressure of the lead-acid battery produced by the above steps can be adjusted, so that the battery conductivity and internal resistance can be controlled.

[0035] Example 2 Comparison between the pre-pressurized balanced modular lead-acid battery based on Example 1 and the traditional lead-acid battery: Use 6 soft-pack single-cell battery cells 2 to assemble a 12V pre-pressurized balanced modular lead-acid battery. Conduct an internal resistance test on this battery, and at the same time conduct an internal resistance test on a traditional 12V lead-acid battery, and fit the obtained impedance data. The fitting results show that the internal resistance R1 of the pre-pressurized balanced modular lead-acid battery is 11.745 mΩ, and the charge transfer resistance R2 is 3.7068 mΩ. The R1 of the traditional lead-acid battery is 11.745 mΩ, and R2 is 4.1526 mΩ. By comparison, it can be seen that whether it is R1 or R2, the pre-pressurized balanced modular lead-acid battery is smaller than the traditional lead-acid battery. Figure 4 is the impedance diagram of the pre-pressurized balanced modular lead-acid battery and the traditional lead-acid battery. Among them, -Z" is the vertical coordinate, representing the imaginary part of the impedance, which mainly reflects the reactance component in the test system; Z' is the horizontal coordinate, representing the real part of the impedance, which mainly reflects the resistance component in the test system; the smaller Z' is, the smaller R1 is; the larger the slope is, the smaller R2 is. According to Figure 4 the following conclusion can be obtained: The pre-pressurized balanced modular lead-acid battery has a smaller impedance and can exhibit better performance.

[0036] Use 6 single-cell battery cells to assemble a 12V pre-pressurized balanced modular lead-acid battery. Conduct a 100%DOD cycle test on this battery, and at the same time conduct a 100%DOD cycle test on a traditional 12V lead-acid battery. The test data is as Figure 5 shown. After 550 cycles of the pre-pressurized balanced modular lead-acid battery, the remaining discharge capacity is 16.10 Ah, while when the traditional lead-acid battery cycles 400 times, the remaining discharge capacity is only 16.20 Ah, and the cycle platform is higher, which indicates that the pre-pressurized balanced modular lead-acid battery has better cycle performance.

[0037] Example 3 Further optimization of the preparation method of the lead-acid battery described in Example 1: Production of 2V single-cell battery cells: 1: Plate casting: The grid is produced by the continuous casting and rolling process.

[0038] 2: Paste Mixing: Use a vacuum paste mixer for paste mixing. The positive paste formula is: 100 parts by weight of lead powder, 6 - 8 parts by weight of red lead, 0.1 - 0.2 parts by weight of graphite, 0.1 - 0.2 parts by weight of stannous sulfate, 0.05 - 1 part by weight of antimony trioxide, 0.2 - 0.8 parts by weight of short fiber, and 1 - 10 parts by weight of water. The negative paste formula is: 100 parts by weight of lead powder, 0.1 - 0.2 parts by weight of barium sulfate, 0.01 - 0.05 parts by weight of humic acid, 0.005 - 0.05 parts by weight of carbon black, 0.005 - 0.02 parts by weight of short fiber, 0.01 - 0.05 parts by weight of lignin, and 1 - 10 parts by weight of water. The specific positive paste formula in this example is: 100 parts by weight of lead powder, 7 parts by weight of red lead, 0.2 parts by weight of graphite, 0.1 parts by weight of stannous sulfate, 0.05 parts by weight of antimony trioxide, 0.5 parts by weight of short fiber, and 10 parts by weight of water. The specific negative paste formula in this example is: 100 parts by weight of lead powder, 0.1 parts by weight of barium sulfate, 0.02 parts by weight of humic acid, 0.01 parts by weight of carbon black, 0.01 parts by weight of short fiber, 0.02 parts by weight of lignin, and 10 parts by weight of water.

[0039] 3: Plate Coating: Use a double - sided plate coater for plate coating.

[0040] 4: Stacking: When stacking the single - cell battery, the plate ratio is two positives and three negatives, and a glass fiber separator is used.

[0041] 5: Formation: After the single - cell battery is assembled, dilute sulfuric acid with a density of 1.25 is poured in for formation. After formation, the single - cell batteries are graded.

[0042] Assembly of 24V battery cells: 1: Stack 12 cells, fasten them with buckles, add pressure - adjusting plates on both sides (3mm per layer), put them into a group pressure tester to detect the group pressure, and set the thickness to 149mm.

[0043] 2: The pressure detected by the group pressure tester is 35kPa, which meets the requirement of being greater than 20kPa. Batteries in the same batch are controlled by adjusting the pressure - adjusting plates according to 3mm.

[0044] 3: After the electrode group is put into the slot, connect the cells in series with a PCB board, and weld the lead posts and the PCB board with an automatic welding machine.

[0045] 4: Weld the lead - out terminals and seal the large battery cover with glue.

[0046] Assembly of 12V battery cells: 1: Stack 6 cells, fasten them with buckles, add pressure - adjusting plates on both sides (2mm per layer), put them into a group pressure tester to detect the group pressure, and set the thickness to 71mm.

[0047] 2: The pressure detected by the group pressure gauge is 40 kPa, which meets the requirement of being greater than 20 kPa. The batteries of the same batch are controlled by adjusting the pressure plate to 2 mm.

[0048] 3: After the electrode group is put into the slot, the battery cells are connected in series with a PCB board, and the lead posts and the PCB board are welded by an automatic welding machine.

[0049] 4: Weld the lead-out terminal and seal the large cover plate of the battery with glue.

[0050] Example 4 Based on the lead-acid battery described in Example 1, the mechanism of its pressure regulation is further elaborated: The main active material of the positive electrode plate 21 is lead dioxide (PbO2), whose theoretical density is about 10.0 g / cm³. The main active material of the negative electrode plate 22 is spongy lead (Pb), whose theoretical density is 11.34 g / cm³. The theoretical density of lead sulfate (PbSO4) is 6.2 g / cm³.

[0051] When the battery is charged, PbSO4 at the positive and negative electrodes is converted into PbO2 and Pb respectively; when discharging, PbO2 at the positive electrode is converted into PbSO4, and Pb at the negative electrode is converted into PbSO4.

[0052] During the charging stage, the positive and negative electrodes change; Positive electrode: PbSO4 + 2H2O → PbO2 + H2SO4 + 2H ＋ + 2e － Negative electrode: PbSO4 + 2e － → Pb + SO4 2－ During the discharging stage, the substances at the positive and negative electrodes change; Positive electrode reduction: PbO2 + H2SO4 + 2H ＋ + 2e － → PbSO4 + 2H2O Negative electrode oxidation: Pb + SO4 2－ → PbSO4 + 2e － Due to their different densities, the active materials expand during discharging and contract during charging.

[0053] Figure 6 As shown in the change of the group pressure during charge and discharge, the present invention can directly control the internal assembly pressure of the finished battery by adjusting the thickness and pressure of the pressure plate, ensuring that the wet electrode group pressure is 20 kPa to 60 kPa.

[0054] The separator 23 is an AGM separator, such as Figure 7As shown in the figure. The AGM separator is formed by the cross - bonding of multiple ultra - fine glass fibers into a sheet structure, which can maintain good contact between the separator and the electrode plate. The separator 23 has elasticity and maintains a certain pressure on the electrode plate when absorbing electrolyte. Since the separator 23 is composed of glass fibers, the glass fibers will break brittlely and lose elasticity when the pressure is too high. Therefore, an appropriate pressure can ensure that the separator 23 can maintain pressure on the electrode plate in the wet state, reducing the risk of increased internal resistance or even shedding of the active material caused by the expansion of the active material, and avoiding premature failure.

[0055] It should be noted that the terms used in this application are only for describing specific embodiments and do not limit the scope of this application. As shown in the specification of this application, unless the context clearly indicates an exception, words such as "a", "an", "one" and / or "the" are not specifically singular and may also include plural. The term "comprising", "including" or any other variant thereof is intended to cover non - exclusive inclusion, so that a process, method or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method or device including the said element.

[0056] It should also be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to this application. Unless otherwise clearly specified and limited, terms such as "installed", "connected", "joined" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0057] The above - mentioned embodiments and / or implementation manners are only used to illustrate the preferred embodiments and / or implementation manners for realizing the technology of the present invention, and do not impose any formal restrictions on the implementation manners of the technology of the present invention. Any person skilled in the art, without departing from the scope of the technical means disclosed in the content of the present invention, can make some changes to other equivalent embodiments, but it should still be regarded as the same technology or embodiment as the present invention in essence. In this text, specific examples are used to illustrate the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. The above is only the preferred implementation manner of the present application. It should be noted that due to the limitation of literal expression and objectively infinite specific structures, for those of ordinary skill in the art, without departing from the principles of the present application, several improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the inventive concept and technical solution to other occasions without improvement, shall all be regarded as the protection scope of the present application.

Claims

1. A lead-acid battery, comprising a trough body (1) with an opening at one end, a cover body cooperating with the trough body (1), and an electric core assembled inside the trough body (1), characterized in that: The battery cell is composed of stacked soft-pack single battery cells (2). A pressure regulating plate is provided in the stacking direction of the soft-pack single battery cells (2), and the pressure of the wet electrode group is adjusted to be 20 kPa - 60 kPa.

2. The lead-acid battery according to claim 1, wherein: The sum of the thicknesses of the stacked compressed soft-pack single battery cells (2) and the thickness of the pressure regulating plate is equal to the inner width of the tank body (1), and the thickness of the pressure regulating plate is adjustable.

3. The lead-acid battery according to claim 1, characterized in that: The soft-pack single battery cell (2) is a single battery cell sealed by a film coating.

4. The lead-acid battery according to claim 1, wherein: The soft-pack single battery cell (2) includes an electrode group, the electrode group is connected to an electrode group encapsulation head, an encapsulation bag is sleeved outside the electrode group and the electrode group encapsulation head, and a safety valve and a cover body are provided on the soft-pack single battery cell (2) and are cooperatively installed with the electrode group encapsulation head to form a sealed structure.

5. The lead-acid battery according to claim 4, characterized in that: The electrode group includes a positive plate (21), a negative plate (22), a separator (23) and a pole column (24). The positive plate (21) and the negative plate (22) of the electrode group and the separator (23) therebetween are stacked. When in use, the positive plate (21), the negative plate (22) and the separator (23) are horizontal, and the soft-pack single battery cells (2) are stacked longitudinally.

6. The lead-acid battery according to claim 1, wherein: The soft-pack single battery cells (2) are electrically connected through a PCB board (3) to form batteries with different voltages.

7. The lead-acid battery according to claim 6, characterized in that: The PCB board (3) combines the soft-pack single battery cells (2) with high consistency according to electrical performance to improve the uniformity of the battery.

8. The lead-acid battery according to claim 6, wherein: The soft-pack single battery cell (2) is a 2V single battery cell.

9. The preparation method of the lead-acid battery according to any one of claims 1-8, characterized in that, It includes the following steps: Manufacture soft-pack single battery cells (2), including processes such as casting plates, mixing pastes, coating plates, wrapping sheets and forming. Stack multiple soft-pack single battery cells (2) and fix them by buckling. After installing the pressure regulating plate, detect and adjust the group pressure to the target value through a group pressure gauge. After loading the electrode group into the tank body (1), weld the series structure, assemble the pressure regulating plate, and complete the battery assembly after encapsulation.

10. The method according to claim 9, wherein Manufacturing the soft-pack single battery cell (2) includes a forming process, specifically including: after the assembly of the soft-pack single battery cell (2) is completed, dilute sulfuric acid is poured in for forming. After the forming is completed, it is graded according to the discharge performance, and those with good capacity consistency are selected to form a battery.

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