Lead-acid storage battery with uniform acid

Abstract

The invention discloses a lead-acid storage battery with uniform acid, and belongs to the technical field of batteries. The lead-acid storage battery comprises a tank body with an opening at one end, a cover body matched with the tank body, and monomer cells which are assembled in the tank body and are sequentially connected, and positive plates, negative plates and partition plates of the monomer cells are all horizontally arranged. After 100 times of cycle tests, the internal acid density deviation of the battery is less than or equal to 0.002 g / mL, and the capacity and the specific energy are both improved compared with those of a traditional lead-acid battery. By horizontally arranging the positive plate, the negative plate and the partition plate, acid layering caused by gravity is eliminated, so that acid is uniformly distributed on the same horizontal plane, and the utilization rate of active substances at the middle and lower parts of the polar plates is further improved; modularized soft package single battery cells are longitudinally stacked, traditional lead cast welding is replaced by PCB welding series connection, and flexible combination of the battery cells is achieved.

Description

Technical Field

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

[0002] Lead-acid power batteries dominate the electric bicycle field due to their low cost and high safety. However, the new national standard for electric bicycles has put forward higher requirements for the overall vehicle quality. Existing models generally face the problem of overweight, and there is an urgent need for battery lightweighting to achieve compliance goals. Currently, most traditional lead-acid batteries for electric bicycles adopt a structure of 1×6 or 2×3 placed vertically. When the battery is in use, the plates and separators are placed vertically. Due to gravity, the acid inside the plates and separators will be stratified, resulting in a potential difference between the upper and lower parts of the plates, and the utilization rate of the active material shows a distribution characteristic of "high at the top and low at the bottom". At present, how to improve the uniformity of acid distribution, optimize the space and then improve the utilization rate of the active material is an urgent problem to be solved in this field. Summary of the Invention

[0003] The purpose of the present invention is to provide a lead-acid battery with high specific energy, which can improve the overall utilization rate of the active material by balancing the acid distribution, avoid abnormal rapid chemical corrosion in a high acid density environment, and at the same time reduce the internal potential difference of the battery and reduce the electrochemical corrosion.

[0004] To solve the above technical problems, the present invention specifically provides the following technical solution: A lead-acid battery with uniform acid, including a trough body with an open end, a cover body cooperating with the trough body, and monomer battery cores assembled inside the trough body and connected in sequence. The monomer battery core includes a pole group, and the pole group includes a positive plate, a negative plate, and a pole column. The positive plate and the negative plate of the pole group are horizontally arranged. A separator is provided between adjacent positive plates and negative plates, and the separator is horizontally placed. When the battery is in use, the positive plate, the negative plate, and the separator are horizontally placed. The sulfuric acid in the same separator is at the same horizontal position, which can form a stable horizontal diffusion layer, eliminating the natural convection caused by gravity, so that the electrolyte density is evenly distributed. Since the positive and negative plates are separated between adjacent separators, independent electrolyte units can be formed, and there will be no density difference caused by gravity. Therefore, the potential of each part of the plate is the same, eliminating the internal self-discharge situation of the conventional battery caused by the inconsistent potential of each part. The consistent internal acid density also improves the utilization rate of the active material in each part of the plate, thereby realizing the improvement of the battery capacity and the specific energy.

[0005] After 100 cycle tests, the battery is fully charged and left standing for 24 h, and the deviation of the internal acid density ≤ 0.002 g / mL. The battery is placed for testing according to its usage status. After 100 cycle tests in accordance with the test method specified in Article 5.11 of the standard "Valve-regulated lead-acid batteries for electrically-assisted bicycles - Part 1: Technical conditions" GB / T 22199.1-2017, the battery is fully charged and left standing for 24 h. Then the battery is dissected, and the separator is divided into three equal parts: upper (sample a), middle (sample b), and lower (sample c). The acid in the three samples is extruded, and the acid density is measured with a densitometer. The deviation of the internal acid density ≤ 0.002 g / mL, that is, ρ 最大值 -ρ 最小值 ≤ 0.002 g / mL, while the deviation of the internal acid density of ordinary lead-acid batteries is 0.04 g / mL - 0.06 g / mL. Reducing the deviation of the acid density can improve the utilization rate of the active material.

[0006] Preferably, the ratio of the width-to-thickness of the single cell is 8 - 20, and specifically, it can be any one of the following specific values or the range between any two of them: 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20. Conventional single cells are narrow and long with a small width-to-thickness ratio. The design of the geometric dimensions of the single cell in the present invention is beneficial to maintaining the balance of the acid concentration in each active area of the electrode plate, improving the uniformity of the electrode plate potential distribution, eliminating the self-discharge reaction caused by the potential difference between the upper and lower parts, and at the same time, enabling the grid of each part to be evenly corroded, avoiding the abnormal rapid corrosion of the lower grid of the conventional battery in a high acid density environment, thereby prolonging the battery life. In addition, increasing the width-to-thickness ratio of the cell can make the heat dissipation of the cell easier, thereby improving the utilization rate of the active material, reducing the reaction heat, and ultimately achieving the purpose of increasing the capacity of a single cell and the battery life.

[0007] The electrode group is connected to the electrode group encapsulation head. The electrode group and the electrode group encapsulation head are sheathed with an encapsulation bag. The electrode group encapsulation head has a valve port structure for cooperating with and installing a safety valve. The modular battery adopts a structure of soft-packing the cell, a single compartment, which is composed of an electrode group encapsulation head, an electrode group, an encapsulation bag, and a safety valve. The single group of electrode groups assembled with the electrode group encapsulation head needs to be installed in the encapsulation bag. The electrode group encapsulation head has a valve port structure for placing the safety valve. The safety valve is a one-way valve, which can not only isolate the external gas from entering the cell, but also relieve the pressure when the internal pressure is too high to maintain the internal air pressure stable.

[0008] Both the positive electrode plate and the negative electrode plate are composed of a grid and an active material, and the grid adopts a rib design. The grid is used to carry the active material to conduct current. As a lightweight design of the modular lead-acid battery, the rib design is conducive to rapid current conduction, thereby reducing the overall internal resistance, improving the charge and discharge efficiency of the battery, reducing the volume and weight while maintaining the qualified capacity, and improving the utilization rate of the active material. In addition, the rib design of the grid can enhance the overall mechanical strength and avoid deformation caused by external forces during the manufacturing or use process.

[0009] Preferably, the alloy dosage of the positive electrode plate is 0.569 g / cm 3 ~0.853 g / cm 3 ; the active material dosage of the positive electrode plate is 4.266 g / cm 3 ~4.692 g / cm 3 ; the alloy dosage of the negative electrode plate is 0.665 g / cm 3 ~0.845 g / cm 3 ; the active material dosage of the negative electrode plate is 3.327 g / cm 3 ~4.402 g / cm 3 . Precise control of the alloy and active material dosages of the positive and negative electrode plates can optimize the conductivity and mechanical strength of the electrode plates, avoid waste of the active material, and improve the energy density and structural stability.

[0010] Specifically, the manufacturing materials of the positive electrode plate and the negative electrode plate include lead paste, two-dimensional conductive material, and glass nanotubes. The role of adding the two-dimensional conductive material is to increase conductivity, improve the utilization rate of the active material, and reduce the dosage of the active material; the role of adding the glass nanotubes is to provide sulfuric acid electrolyte in a timely manner during the discharge process, greatly reduce the concentration polarization, improve the voltage drop during the discharge process, improve the utilization rate of the active material, and reduce the dosage of the active material.

[0011] The single-cell battery is a soft-pack single-cell battery and there are at least two of them. The single-cell batteries are stacked longitudinally and connected in series by welding with a PCB board. In traditional batteries, after 6 single cells are assembled, formation is carried out. The 6 single cells cannot be adjusted according to the formation performance of the battery. The present invention replaces the overall lead casting welding method of traditional batteries with the welding method of the PCB board, and adopts the method of separately forming single-cell batteries. Each battery is grouped according to the formation performance of the single-cell battery. In this way, the uniformity of the battery performance can be guaranteed to the greatest extent and the battery life can be improved. The connection of the PCB board can realize the modular combination of single-cell batteries, adapt to more usage scenarios. At the same time, the connection of the PCB board reserves an interface for the intelligent management of the battery and the capacity balance of the single cells, making the intelligent management of lead-acid batteries possible.

[0012] The beneficial effects of the present invention are as follows: The present invention adopts the mode of battery cell + outer shell. By vertically stacking single battery cells, the active materials of the battery can be balanced. When vertically stacking, the plates and separators are placed horizontally, and the acid in the same horizontal plane tends to be consistent, so that the utilization rate of the active materials in the middle and lower parts of the plates is improved, thereby realizing the improvement of battery capacity and specific energy. The present invention sets the aspect ratio of the single battery cell to 8-20, which is beneficial to maintaining the balance of the acid concentration in each active area of the plate, enabling the grid of each part to be evenly corroded, and at the same time improving the uniformity of the potential distribution of the plate, eliminating the self-discharge reaction caused by the potential difference between the upper and lower parts. In addition, the single battery cells are connected in series by welding with a PCB board, replacing the traditional overall lead casting welding method of the battery. They can be combined according to the formation performance of the single battery cells to improve the uniformity of the lead-acid battery, and further improve the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained according to the provided drawings.

[0014] Figure 1 It is a schematic diagram of the internal structure of the lead-acid battery of the present invention.

[0015] Figure 2 It is a schematic diagram of the single battery cell of the present invention (L is the width of the single battery cell, and W is the thickness of the single battery cell).

[0016] Figure 3 It is a schematic diagram of the structure of the soft-pack single battery cell described in Example 1.

[0017] Figure 4 It is a schematic diagram of the battery dissection sampling of the present invention.

[0018] Figure 5 It is a graph of the temperature difference of formation for battery cells with three aspect ratios.

[0019] Description of the reference numerals: 1 - tank body; 2 - single battery cell; 21 - positive plate; 22 - negative plate; 23 - separator; 24 - terminal post; 3 - PCB board; 4 - upper part of the battery; 5 - middle part of the battery; 6 - lower part of the battery. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] First, the concepts involved in the present application will be described 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 and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0022] Embodiment 1 As Figure 1~Figure 3 , a lead-acid battery with uniform acid, includes a trough body 1 with an open end, a cover body cooperating with the trough body 1, and monomer cells 2 assembled inside the trough body 1 and connected in sequence. The monomer cells 2 include electrode groups, and the electrode groups include positive plates 21, negative plates 22, and electrode posts 24. The positive plates 21 and negative plates 22 of the electrode groups are horizontally arranged. A separator 23 is provided between adjacent positive plates 21 and negative plates 22, and the separator 23 is horizontally placed. When the battery is in use, the positive plates 21, negative plates 22, and separator 23 are horizontally placed, and the acid in the same horizontal plane tends to be consistent, so that the utilization rate of the active substances in the middle and lower parts of the plates is improved, thereby realizing the improvement of the battery capacity and specific energy.

[0023] Through 100-cycle tests, after the battery is fully charged and left to stand for 24h, the internal acid density deviation ≤ 0.002g / mL. The battery is placed for testing according to the usage state. According to the test method in Article 5.11 of the standard GB / T22199.1-2017 Valve-regulated lead-acid batteries for electrically assisted bicycles - Part 1: Technical conditions, after 100-cycle tests, the battery is fully charged and left to stand for 24h, and then the battery is dissected. As Figure 4 , the separator is divided into three equal parts: upper (sample a), middle (sample b), and lower (sample c), the acid in the 3 samples is extruded, and the acid density is measured with a densitometer. The internal acid density deviation ≤ 0.002g / mL, that is, ρ 最大值 -ρ 最小值 ≤ 0.002g / mL, while the internal acid density deviation of ordinary lead-acid batteries is 0.04g / mL - 0.06g / mL. Reducing the acid density deviation can improve the utilization rate of the active substances.

[0024] The voltage of the single cell 2 is 2V, and it is a single enclosed cell through flexible packaging. Thus, the single cell can be pressure-aged, and cells with good capacity consistency can be selected according to the discharge performance to form a battery, improving the battery consistency and avoiding the uneven aging temperature of each single cell inside caused by aging multiple single cells together, thereby affecting the comprehensive performance of the battery.

[0025] Preferably, the aspect ratio of the single cell 2 is 8 - 20. For example Figure 5 , increasing the aspect ratio of the cell can make the heat dissipation of the cell easier, avoid a large temperature gradient inside the battery caused by slow heat dissipation at the bottom, and thus affect the acid solution distribution through heat convection, ultimately achieving the purpose of increasing the capacity and battery life of the single cell.

[0026] The electrode group is connected to the electrode group encapsulation head. The electrode group and the electrode group encapsulation head are sheathed with an encapsulation bag, and the electrode group encapsulation head has a valve port structure for cooperating with and installing a safety valve. The modular battery adopts the structure of a soft-packaged cell, a single cell, which is composed of an electrode group encapsulation head, an electrode group, an encapsulation bag, and a safety valve. The single group of electrode groups assembled with the electrode group encapsulation head needs to be installed in the encapsulation bag. The electrode group encapsulation head has a valve port structure for placing the safety valve. The safety valve is a one-way valve, which can not only isolate external gas from entering the cell, but also relieve pressure when the internal pressure is too high to maintain the internal air pressure stable. Preferably, the electrode group encapsulation head has a buckle structure, which includes a buckle-hook and a buckle-hole, and multiple electrode group encapsulation heads are combined through buckle cooperation. The buckle structure is designed on both sides of the electrode group head, which is convenient for quickly fixing and disassembling multiple electrode groups, improving the assembly efficiency, and replacing abnormal electrode groups when necessary. Preferably, the surface of the electrode group encapsulation head in contact with the encapsulation bag is provided with a texture structure for increasing the heat-sealing contact surface area. Increasing the heat-sealing contact surface area can enhance the bonding force between the electrode group head and the encapsulation bag.

[0027] The single cell 2 is a soft-packaged single cell and there are at least two of them. The single cells 2 are stacked longitudinally and connected in series by welding with a PCB board 3. The welding method of the PCB board 3 replaces the traditional overall lead casting welding method of the battery, which can achieve arbitrary combination, thus realizing modular combination and adapting to more usage scenarios. At the same time, the connection of the PCB board 3 reserves an interface for the intelligent management of the battery and the capacity balance of the cells, making the intelligent management of lead-acid batteries possible. For traditional batteries, after 6 single cells of the battery are assembled, aging is carried out. The 6 single cells cannot be adjusted according to the aging performance of the battery. The present invention adopts the method of aging single cells separately. Each battery is grouped again according to the aging performance of the single cell. During assembly, single cells 2 with similar capacities, voltages, and internal resistances are pre-screened and then combined, which can ensure the uniformity of battery performance to the greatest extent and improve the battery life.

[0028] Both the positive electrode plate 21 and the negative electrode plate 22 are composed of a grid and active materials, and the grid adopts a rib design. The grid is used to carry the active materials to conduct current. As a lightweight design of the modular lead-acid battery, the rib design is conducive to rapid current conduction, thereby reducing the overall internal resistance, improving the charge and discharge efficiency of the battery, reducing the volume and weight while maintaining the qualified capacity, and improving the utilization rate of the active materials. For horizontal electrode plates, the ribs serve as a diversion structure, which can promote the lateral diffusion of the electrolyte, avoid the formation of a concentration gradient in a local area, reduce the difference between the edge and the center of the electrode plate, so as to achieve acid uniformity. In addition, the grid adopting a rib design can enhance the overall mechanical strength and avoid deformation caused by external forces during the manufacturing or use process.

[0029] Preferably, the alloy dosage of the positive electrode plate is 0.569 g / cm 3 ~0.853 g / cm 3 ; the active material dosage of the positive electrode plate is 4.266 g / cm 3 ~4.692 g / cm 3 ; the alloy dosage of the negative electrode plate is 0.665 g / cm 3 ~0.845 g / cm 3 ; the active material dosage of the negative electrode plate is 3.327 g / cm 3 ~4.402 g / cm 3 . If the distance between the horizontally stacked electrode plates is too small, the fluidity of the electrolyte is limited, the diffusion resistance increases, and it is easy to form a local acid concentration difference; if the distance is too large, the volume of the electrolyte needs to be increased to cover the electrode plates, which may reduce the energy density. Precisely controlling the alloy and active material dosages of the positive and negative electrode plates can optimize the conductivity and mechanical strength of the electrode plates, avoid waste of active materials, and improve the energy density and structural stability. The manufacturing materials of the positive electrode plate 21 and the negative electrode plate 22 include lead paste, two-dimensional conductive materials, and glass nanotubes. The function of adding two-dimensional conductive materials is to increase conductivity, improve the utilization rate of active materials, and reduce the dosage of active materials; the function of adding glass nanotubes is to provide sulfuric acid electrolyte in a timely manner during the discharge process, greatly reduce the concentration polarization, improve the voltage drop during the discharge process, improve the utilization rate of active materials, and reduce the dosage of active materials. For horizontal electrode plates, adding nanomaterials can inhibit sulfation, maintain the porosity unobstructed, avoid the accumulation of shed substances on the horizontal surface of the electrode plate, block the pores and limit the penetration of the electrolyte, thereby exacerbating the uneven local acid distribution.

[0030] Example Two To verify the effects described in Example One, a comparison was made between the balanced modular battery and the ordinary battery.

[0031] The battery is tested in the fully charged state. According to the test method in Article 5.11 of the standard GB / T 22199.1-2017 Valve-regulated lead-acid batteries for electrically assisted bicycles - Part 1: Technical conditions, after 100 cycles of testing, the battery is fully charged and then left standing for 24 hours. The battery is dissected, and the separator is divided into three equal parts: upper (sample a), middle (sample b), and lower (sample c). The acid in the three samples is squeezed out, and the acid density is measured with a hydrometer. The lead paste from the upper, middle, and lower parts of the positive electrode plate is sampled, and the lead dioxide content in the lead paste is tested by chemical analysis.

[0032] The test results are as follows: Table 1 Distribution of active substance lead dioxide

[0033] Table 2 Distribution of acid density

[0034] Table 3 Charging capacity and specific energy

[0035] After testing, the internal acid density deviation of the lead-acid battery of the present invention is ≤0.002 g / mL, that is, ρ 最大值 -ρ 最小值 ≤0.002 g / mL, while the internal acid density deviation of ordinary lead-acid batteries is 0.04 g / mL - 0.06 g / mL. The utilization rate of the active substance of the lead-acid battery of the present invention is improved compared with that of ordinary lead-acid batteries. The reason is as follows: During the charging stage, sulfuric acid is generated on the surfaces of the positive and negative electrodes respectively, resulting in an increase in the sulfuric acid density near the electrode plates; • Oxidation reaction occurs at the positive electrode: PbSO4 + 2H2O → PbO2 + H2SO4 + 2H ＋ + 2e － • Reduction reaction occurs at the negative electrode: PbSO4 + 2e － → Pb + SO4 2－ During the discharging stage, sulfuric acid is consumed in both the positive and negative electrode reactions, resulting in a decrease in the sulfuric acid density on the electrode plate surfaces; • Reduction at the positive electrode: PbO2 + H2SO4 + 2H ＋ + 2e － → PbSO4 + 2H2O • Oxidation at the negative electrode: Pb + SO4 2－ → PbSO4 + 2e － In traditional lead-acid batteries, since the positive and negative plates and separators are placed vertically, during charging, the high-density acid solution forms a concentrated acid region at the bottom due to gravitational sedimentation. During discharging, the low-density electrolyte generated floats to the top, forming a vertical concentration gradient. A stable structure of "acid-deficient at the top - acid-rich at the bottom" is formed during the cycling process, resulting in: irreversible deposition of lead sulfate on the upper plate due to insufficient acid concentration, accelerated corrosion of the grid on the lower plate due to overly concentrated acid, a gradient distribution of the utilization rate of the active material, and a low utilization rate of the active material at the bottom. The present invention adopts an innovative acid balance structure. The positive and negative plates are placed in the best balanced state of the active material, the plates and separators are placed horizontally, and the sulfuric acid within the same separator is at the same horizontal position, which can form a stable horizontal diffusion layer, eliminating natural convection caused by gravity, thereby enabling the electrolyte density to be evenly distributed. Since the positive and negative plates are interposed between adjacent separators, independent electrolyte units can be formed, and there will be no density difference caused by gravity.

[0036] According to the Nernst equation

[0037] The following simplified formula can be obtained: Equilibrium voltage = acid density + 0.84. Wherein, is the standard electromotive force, usually between 1.93V and 2.04V, and are the activities of sulfuric acid and water respectively, the coefficient 0.059 corresponds to the temperature condition at 25°C, and n = 2 is the number of electrons transferred in the reaction.

[0038] The equilibrium voltages of each part of the battery are calculated as shown in the following table.

[0039] Table 4 Equilibrium Voltages of Each Part of the Battery Different locations Ordinary battery Battery of the present invention Upper (V) 2.162 2.191 Middle (V) 2.183 2.191 Lower part(V) 2.210 2.190 Range(mV) 48.8 1.1 The aspect ratio of the single cell core of the battery of the present invention is 8 - 20, and the plates are horizontal. Compared with ordinary batteries, the acid concentration in each active area of the plates is balanced, the uniformity of the plate potential distribution is good, the self-discharge reaction caused by the potential difference between the upper and lower parts is eliminated, and at the same time, the grids of each part are evenly corroded, avoiding the abnormal rapid corrosion of the lower grid of the conventional battery in a high acid density environment, thus improving the battery life.

[0040] 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 otherwise, words such as "a", "an", "one" and / or "the" do not specifically refer to the singular and may also include the plural. The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method or device comprising 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 "comprising one..." does not exclude the existence of additional identical elements in the process, method or device comprising the said element.

[0041] 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, and therefore cannot be understood as a limitation of this application. Unless otherwise clearly specified and defined, 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 circumstances.

[0042] The above-described embodiments and / or implementation manners are only used to illustrate the preferred embodiments and / or implementation manners for implementing 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, may make some modifications to other equivalent embodiments, but should still be regarded as the same technology or embodiment as the present invention in essence. In this article, specific examples are used to elaborate on the principles and implementation manners of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application. The above is only the preferred implementation manner of this application. It should be noted that due to the limitation of literal expression and objectively existing infinite specific structures, for those of ordinary skill in the art, without departing from the principle of this application, several improvements, refinements or changes can also be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the concept and technical solution of the invention to other occasions without improvement, should all be regarded as the protection scope of this application.

Claims

1. A lead-acid battery with uniform acid, comprising a trough body (1) with an opening at one end, a cover body cooperating with the trough body (1), and monomer battery cores (2) assembled inside the trough body (1) and connected in sequence, characterized in that: The single cell (2) includes a plate group, the plate group includes a positive plate (21) and a negative plate (22). After the lead-acid battery is subjected to 100 cycle tests and then left standing for 24 hours, the acid density deviation inside the battery is ≤0.002 g / mL.

2. The lead-acid battery with uniform acid according to claim 1, wherein: The positive plate (21) and the negative plate (22) of the single cell (2) are stacked crosswise, and the positive plate (21) and the negative plate (22) are horizontal during use.

3. The lead-acid battery with uniform acid according to claim 1, characterized in that: A separator (23) is provided between adjacent positive plates (21) and negative plates (22), and the separator (23) is placed horizontally.

4. A lead-acid battery with uniform acid according to claim 1, characterized in that: The aspect ratio of the single cell (2) is 8 to 20.

5. A lead-acid battery with uniform acid according to claim 1, characterized in that: The single cell (2) is a soft-pack single cell, and the single cells (2) are stacked longitudinally and electrically connected.

6. The lead-acid battery with uniform acid according to claim 1, characterized in that: The voltage of the single cell (2) is 2V, and it is a single enclosed cell individually through flexible packaging.

7. An evenly acidic lead-acid battery according to claim 6, characterized in that: The plate group is connected to a plate group encapsulation head, and an encapsulation bag is sleeved outside the plate group and the plate group encapsulation head to form flexible packaging. The plate group encapsulation head has a valve port structure for mating installation with a safety valve.

8. The lead-acid battery with uniform acid according to claim 1, characterized in that: Both the positive plate (21) and the negative plate (22) are composed of a grid and active substances, and the grid adopts a rib design.

9. The lead-acid battery with uniform acid according to claim 1, wherein: The alloy dosage of the positive electrode plate (21) is 0.569 g / cm 3 ~0.853 g / cm 3 ; and / or The amount of the active material of the positive electrode plate (21) is 4.266 g / cm 3 ~4.692 g / cm 3 ; and / or The alloy dosage of the negative electrode plate (22) is 0.665 g / cm 3 ~0.845 g / cm 3 ; and / or The amount of the active material of the negative electrode plate (22) is 3.327 g / cm 3 ~4.402 g / cm 3 .

10. A lead-acid battery with uniform acid, comprising a trough body (1) with an opening at one end, a cover body cooperating with the trough body (1), and monomer battery cells (2) assembled inside the trough body (1) and connected in sequence, characterized in that: The single cells (2) are screened and grouped according to electrical performance and are connected in series by means of soldering on a PCB board (3).

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