High-temperature-resistant lead-acid storage battery positive plate and preparation method thereof

Abstract

The invention belongs to the technical field of lead-acid storage batteries, and particularly relates to a high-temperature-resistant lead-acid storage battery positive plate and a preparation method thereof.The high-temperature-resistant lead-acid storage battery positive plate comprises lead paste A and lead paste B. The weight ratio of the lead paste A to the lead paste B is 1: 5, and the lead paste A comprises, by weight, 0.5-0.6% of cerous sulfate, 0.5-0.6% of antimony trioxide, 7-8% of dilute sulphuric acid, 7.8-9.5% of pure water and the balance lead powder; the lead paste B is prepared from the following components in percentage by weight: 0.20 to 0.27 percent of graphite, 0.08 to 0.12 percent of activated carbon fiber, 0.08 to 0.12 percent of 4BS power seed, 2.5 to 3.0 percent of red lead, 7 to 8 percent of dilute sulphuric acid, 8.5 to 9.5 percent of pure water and the balance of lead powder. The industrial pain point that the service life of the lead-acid storage battery is sharply shortened in a high-temperature area (such as a tropical area) and a high-temperature working condition (such as a communication base station and new energy equipment) is solved, the battery replacement frequency can be reduced, the use cost of a user can be reduced, the cooling energy consumption of an air conditioner (such as the communication base station) can be reduced, and the application scene of the lead-acid storage battery is expanded.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of lead-acid batteries, and particularly relates to a high-temperature-resistant positive plate of a lead-acid battery and a preparation method. BACKGROUND

[0002] Lead-acid batteries have been widely used in many fields such as electric power-assisted bicycles, automobile starting power sources, communication base station standby power sources, electric tools and new energy related equipment due to their stable charge-discharge performance, safety and reliability, low cost and other advantages, and have become an indispensable energy storage device in current social production and life. However, its performance, especially the cycle life and high-temperature stability, has always been a key factor restricting its large-scale application in more harsh environments (such as high-temperature regions or high-temperature working conditions). The optimal working temperature range of lead-acid batteries is usually 10-35℃. When the ambient temperature is higher than 35℃ for a long time, the chemical reaction inside the battery accelerates, and the side reaction intensifies, which can cause a series of problems, mainly including: (1) the binding force between the active materials (lead dioxide) of the positive plate is weakened, and is easy to soften, mud and fall off under the volume "pulsation" of charge and discharge; (2) the corrosion rate of the grid is accelerated; (3) the loss of water in the electrolyte (gas evolution, evaporation) is accelerated. These problems together cause the battery capacity to decay quickly, and the cycle life and float life to be significantly shortened. Studies have shown that when the temperature exceeds 35℃, for every 10℃ increase, the battery life may be reduced by about 50%. Therefore, developing lead-acid batteries that can maintain long life and stable performance in high-temperature environments is of great significance for reducing the air conditioning energy consumption of communication base stations and other facilities and expanding the application scenarios of batteries in high-temperature regions.

[0003] In order to improve the performance of lead-acid batteries, especially the performance of the positive plate, the industry has conducted a lot of research, mainly focusing on the improvement of the positive lead paste formula and the optimization of the preparation process. In the prior art, the common technical routes include: First, introduce special additives: ①Add rare earth elements, such as the rare earth red lead disclosed in patent document CN108550804A - a kind of lead-acid battery positive lead paste containing rare earth red lead, which aims to improve the structure of active material, increase the initial capacity and cycle life; ②Add titanium carbide, nano calcium oxide, etc. to enhance the strength of active material, such as patent document CN108550804A - a kind of lead-acid battery positive lead paste containing rare earth red lead; ③Add conductive polymer binder to enhance the binding force between active materials and between active materials and grid, inhibit shedding, and improve conductivity, such as PEDOT:PSS / CMC disclosed in patent document CN119673976A - a kind of long-life valve-regulated power battery positive lead paste formula and preparation method; ④Add porous glass beads, activated carbon, etc. to improve the porosity of the plate and the large current discharge performance, such as patent document CN111261839A - a deep cycle power battery positive plate and its preparation method.

[0004] Second, optimize the design and alloy of the grid: Such as patent document CN111261839A - a deep cycle power battery positive plate and its preparation method, which adopts a radial grid structure design to reduce the internal resistance of large current discharge, and uses a lead calcium tin silver selenium lanthanum aluminum alloy with stronger corrosion resistance.

[0005] Third, improve and paste and curing process: Such as patent document CN103762358A - a positive lead paste for lead-acid storage battery and its preparation method, which uses high temperature and paste process to promote the formation of four basic lead sulfate (4BS) seed crystals to improve the cycle life; Such as patent document CN111261839A - a deep cycle power battery positive plate and its preparation method, CN117525304A - a preparation method of positive lead paste and positive plate for lead-acid storage battery, which uses a fine process control such as step-by-step addition, vacuum and paste, and segmented curing, to obtain a more uniform lead paste structure and stable plate performance.

[0006] Fourth, special design for high temperature application: Such as patent document CN112086646A - a high temperature resistant lead-acid storage battery and its preparation method, which adds specific nano solid solution (thallium oxide / tantalum oxide), conductive short fibers and crosslinking agent to build a reinforced concrete-like stable structure, improve the bonding strength and oxygen evolution overpotential of the positive plate at high temperature, and thus alleviate the mudification and water loss.

[0007] In summary, although the above-mentioned prior art has alleviated the high temperature failure problem to some extent, there are still some deficiencies: some additives are high in cost, poor in dispersibility, and difficult to be applied on a large scale; alloy modification is easy to sacrifice the hydrogen evolution overpotential, affecting the charging efficiency; and the complex preparation process increases the production difficulty and cost. These deficiencies make it difficult for the prior art to prepare a lead-acid battery positive plate with high heat resistance, good electrochemical performance, low cost and easy industrial production. Therefore, a new technical solution is needed to solve the above technical problems. SUMMARY

[0008] The purpose of the present application is to provide a high temperature resistant lead-acid battery positive plate and its preparation method, to solve the problem that the current lead-acid battery is difficult to prepare a positive plate with high heat resistance, good electrochemical performance, low cost and easy industrial production.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a high-temperature resistant lead-acid battery positive electrode plate, comprising lead paste A and lead paste B, wherein the weight ratio of lead paste A to lead paste B is 1:5. Lead paste A, by weight percentage of its components, comprises: 0.5-0.6% cerium sulfate, 0.5-0.6% antimony trioxide, 7-8% dilute sulfuric acid, 7.8-9.5% pure water, with the remainder being lead powder; lead paste B, by weight percentage of its components, comprises: 0.20-0.27% graphite, 0.08-0.12% activated carbon fiber, 0.08-0.12% 4BS power seed, 2.5-3.0% red lead, 7-8% dilute sulfuric acid, 8.5-9.5% pure water, with the remainder being lead powder.

[0010] Furthermore, the cerium sulfate meets the analytical purity requirements of HGB3204-1960; the antimony trioxide meets the 99.80 grade requirements of GB / T 4062-2013; the graphite meets the high-purity graphite requirements of GB / T 3518-2008; the activated carbon fiber has a diameter and length of 10-15 nm and 2.5-3.0 mm, respectively; the 4BS power seed is a white or light yellow crystalline powder with a particle size ≤3 μm, a purity ≥98%, and iron, copper, and chlorine impurities ≤0.001%; ​​the red lead meets the requirements of other industrial grade I products of HG / T3850-2006; the dilute sulfuric acid has a density of 1.400±0.001 g / mL at 25°C; the pure water has a conductivity ≤2 μS / cm; the lead powder has an oxidation degree of 73-78% and its lead raw material grade is Pb99.994.

[0011] The specific steps for preparing the high-temperature resistant lead-acid battery positive plate based on the above components and formula are as follows: S1. Preparation of lead paste A: Cerium sulfate, antimony trioxide, lead powder, pure water, and dilute sulfuric acid are mixed to obtain lead paste A. The specific mixing method is as follows: First, add the prescribed amounts of lead powder, cerium sulfate, and antimony trioxide to a paste mixer and stir for 5-8 minutes; then add the prescribed amount of pure water to the paste mixer, with a total addition time of ≤3 minutes, during which stirring is required; after the pure water is completely added, continue stirring for 5-8 minutes, then add the prescribed amount of dilute sulfuric acid, with a total addition time of 11-15 minutes, during which stirring is required; after the dilute sulfuric acid is completely added, continue stirring for another 5-8 minutes, and then test the apparent specific gravity and discharge temperature of the lead paste. The apparent specific gravity of the lead paste is 4.40-4.44 g / cm³; the discharge temperature is ≤50℃. S2, preparing lead paste B: graphite, activated carbon fiber, 4BS power seed, red lead, pure water, dilute sulfuric acid, lead powder are stirred and mixed to obtain lead paste B, and the specific mixing method is as follows: the specific mixing method of the lead paste B is as follows: first, the formula amount of lead powder, graphite, activated carbon fiber, 4BS power seed and red lead are added to the paste machine and stirred for 4-6 min; then the formula amount of pure water is added to the paste machine, and the total time of adding pure water is ≤90s, and stirring is required during the period; after the pure water is added, continue to stir for 4-6 min, and the formula amount of dilute sulfuric acid is added in five times, and the total time of adding dilute sulfuric acid is 9-10 min, and stirring is required during the period; after the dilute sulfuric acid is added, it still needs to be stirred in five times; after the stirring is completed, the specific gravity and the paste temperature of the lead paste can be detected, the specific gravity of the lead paste is 4.42-4.46g / cm3; the paste temperature is ≤50℃; S3, preparing a composite lead paste: the lead paste A obtained in S1 is mixed with the lead paste B obtained in S2 according to the weight ratio of 1:5 to obtain a composite lead paste; S4, preparing a lead paste coated plate: the composite lead paste is coated on the positive plate to obtain a lead paste coated plate; S5, curing and drying: the lead paste coated plate is cured and dried to obtain a positive plate.

[0012] Further, in S2, the formula amount of the dilute sulfuric acid added in five times is respectively: 25% of the formula amount is added for the first time, and the vacuum degree is ≤460mbar during the period; 25% of the formula amount is added for the second time, and the vacuum degree is ≤460mbar during the period; 25% of the formula amount is added for the third time, and the vacuum degree is ≤460mbar during the period; 20% of the formula amount is added for the fourth time, and the vacuum degree is ≤460mbar during the period; 5% of the formula amount is added for the fifth time, and the vacuum degree is ≤270mbar during the period.

[0013] Further, in S2, the five times of stirring after the addition of the dilute sulfuric acid is respectively: the first stirring is 48s, and the vacuum degree is ≤180mbar; the second stirring is 48s, and the vacuum degree is ≤150mbar; the third stirring is 48s, and the vacuum degree is ≤130mbar; the fourth stirring is 48s, and the vacuum degree is ≤110mbar; the fifth stirring is 48s, and the vacuum degree is ≤90mbar.

[0014] Compared with the prior art, the beneficial effects of the present application are: 1.The application effectively avoids the problem of mutual interference of additives in the traditional formula by dividing the positive lead paste into functionally complementary lead paste A and lead paste B and designing a 1:5 ratio composite, especially, cerium sulfate and antimony trioxide can inhibit the generation of 4BS (tetrabasic lead sulfate) crystal nucleus, so that 4BS can fully develop into an alpha-PbO2 skeleton, significantly improving the structural stability of active material at high temperature; through the preparation and mixing method of divided paste, the effective generation and development of 4BS seed are ensured, and the high-temperature resistance and corrosion resistance of rare earth and antimony-based additives are fully utilized, realizing the maximum synergy of the performance of each component; by introducing rare earth nucleating agent (cerium sulfate) and corrosion-resistant / inhibiting antimony-free effect component (antimony trioxide) into lead paste A, the side reaction or inactivation of other additives (such as 4BS seed and carbon material) in high-acid / high-water environment is effectively avoided; lead paste B focuses on building a high-strength active material skeleton (4BS dynamic seed), improving the conductive network and pore structure (graphite+activated carbon fiber), and improving the charging acceptance (red lead), and on this basis, the ratio of each component is accurately optimized, and the synergy problem between high-temperature performance additives is cleverly solved, thereby obtaining a high-temperature cycle life and structural stability significantly better than the prior art.

[0015] 2.Through accurate selection and ratio optimization of additives, the application builds a "corrosion inhibition-structure enhancement-conductive optimization-charge improvement" all-round performance improvement system, and all additives are low-cost, easy-to-obtain conventional materials, avoiding the problem of high cost and poor dispersibility of high-end additives in the prior art. The particle size of the 4BS dynamic seed is ≤3μm, and the purity is ≥98%, a large number of 4BS crystal phases can be formed during high-temperature solidification, and after conversion, a stable alpha-PbO2 skeleton is formed, which significantly improves the corrosion resistance of the plate; cerium sulfate (rare earth compound) is used as a nucleating agent to effectively inhibit plate corrosion and side reaction heat release, reduce the internal temperature rise of the battery, and eliminate the "antimony-free effect" with antimony trioxide, thereby double protecting the structural stability at high temperature; the activated carbon fiber has a wire diameter of 10-15nm and a wire length of 2.5-3.0mm, which not only connects the surface and deep layers of the plate, so that the deep active material can fully participate in the reaction, but also significantly enhances the adhesion between the lead paste and the grid, effectively inhibiting the softening, mudification and shedding of the active material at high temperature; high-purity graphite is used as a conductive agent and an expanding agent, which not only improves the conductive performance of the plate, but also optimizes the pore structure, ensuring the large-current discharge capacity; the red lead meets the requirements of industrial first-class products, which significantly improves the charging acceptance of the plate, and in combination with the synergy of each component, the battery can still maintain stable charge and discharge efficiency at high temperature, avoiding rapid capacity decay.

[0016] 3.The present application adopts the overall process of "preparing lead paste A→ preparing lead paste B→ composite lead paste→ coating plate→ curing and drying", which converts the "separate paste formula" into an industrialized process system, and solves the fundamental contradiction of "single paste leading to component antagonism" in the prior art. Specifically, the present application adopts the process design of step-by-step preparation + 1:5 mixing and stirring, which ensures that the components of cerium sulfate, antimony trioxide in lead paste A and 4BS power seeds, activated carbon fiber, etc. in lead paste B are dispersed in a "physically isolated" state, and then uniformly mixed through short-time mixing, which not only avoids the inhibition of sulfates / antimony trioxide on the formation of 4BS, but also ensures the uniform distribution of each additive in the composite lead paste, maximizes the synergistic effect of "corrosion inhibition + skeleton strengthening + conductivity optimization", and has no complex special process. Compared with the complex process such as "high-temperature paste" and "staged curing" in the prior art, the present application is easier to realize large-scale production and solves the pain point of "high performance and easy industrialization".

[0017] 4.The present application introduces a fine process of staged, controlled vacuum, controlled temperature and time in the lead paste preparation process, especially the preparation of lead paste B adopts a five-stage dilute sulfuric acid addition and a five-stage vacuum stirring process. By gradually adjusting the vacuum degree and stirring time, air bubbles are effectively removed, and the density and uniformity of the lead paste are improved, which not only avoids component segregation caused by uneven stirring, but also significantly improves the control of apparent specific gravity and paste temperature of the lead paste, laying a process foundation for forming a stable and high-strength α-PbO2 skeleton in the subsequent curing process.

[0018] 5.The positive plate prepared by the present application is applied to a 48V20Ah lead-acid battery, and the cycle life is improved by about 30% compared with the benchmark product on the market, directly solving the industry pain point of rapid shortening of the service life of lead-acid batteries in high-temperature regions (such as tropical regions) and high-temperature working conditions (such as communication base stations and new energy equipment). Not only can it reduce the frequency of battery replacement and reduce the user's use cost, but also can reduce the air conditioning cooling energy consumption (such as communication base stations), and expand the application scenarios of lead-acid batteries. DETAILED DESCRIPTION

[0019] The following examples are used to further illustrate the content of the present application, and do not limit the application of the present application (the percentages below are all weight percentages). Example 1:

[0020] The present embodiment provides a preparation method of a high-temperature-resistant lead-acid battery positive plate, and the specific steps are as follows: Firstly, take cerium sulfate 0.60%, antimony trioxide 0.60%, lead powder 82.17%, dilute sulfuric acid 7.13% and pure water 9.50% as the raw material components of lead paste A, wherein the cerium sulfate meets the analytical purity requirement in HGB3204-1960; the antimony trioxide meets the 99.80 grade requirement in GB / T 4062-2013; the dilute sulfuric acid has a density of 1.400±0.001 g / mL at 25℃; the conductivity of the pure water is ≤2 μS / cm; the lead powder has an oxidation degree of 73-78% and its lead raw material grade is Pb99.994.

[0021] Secondly, take graphite 0.20%, activated carbon fiber 0.08%, 4BS power seed 0.08%, red lead 2.61%, lead powder 80.91%, dilute sulfuric acid 7.02% and pure water 9.10% as the raw material components of lead paste B, wherein the graphite meets the high-purity graphite requirement in GB / T 3518-2008; the activated carbon fiber has a filament diameter and length of 10-15 nm and 2.5-3.0 mm respectively; the 4BS power seed is white or light yellow crystalline powder with a particle size of ≤3 μm, a purity of ≥98% and ≤0.001% of iron, copper, chlorine impurities; the red lead meets the other industrial first-grade product requirement in HG / T3850-2006; the dilute sulfuric acid has a density of 1.400±0.001 g / mL at 25℃; the conductivity of the pure water is ≤2 μS / cm; the lead powder has an oxidation degree of 73-78% and its lead raw material grade is Pb99.994.

[0022] Thirdly, prepare lead paste A and lead paste B according to the above-mentioned raw materials and their formulations: Firstly, prepare lead paste A: add 82.17% of lead powder, 0.60% of cerium sulfate and 0.60% of antimony trioxide into a pug mill and stir for 5-8 min; then add 9.50% of pure water into the pug mill, the total adding time of the pure water is ≤3 min, and the stirring should be kept during the adding; after the pure water is added, continue to stir for 5-8 min, add 7.13% of dilute sulfuric acid, the total adding time of the dilute sulfuric acid is 11-15 min (the specific adding time is determined according to the environmental temperature, the higher the environmental temperature, the longer the adding time), and the stirring should be kept during the adding; after the dilute sulfuric acid is added, continue to stir for 5-8 min, and detect the specific gravity of the lead paste, which is 4.40-4.44 g / cm 3 and the paste temperature is ≤50℃; Preparation of lead paste B: 80.91% of lead powder, 0.20% of graphite, 0.08% of activated carbon fiber, 0.08% of 4BS power seed and 2.61% of red lead are added into the pug mill and stirred for 4-6 minutes; 9.10% of pure water is added into the pug mill, the total time of adding pure water is ≤90 seconds, and the stirring is needed during the adding; after the adding of pure water is completed, the stirring is continued for 4-6 minutes; 1.755% of dilute sulfuric acid is added for the first time, and the vacuum degree is ≤460 mbar during the adding; 1.755% of dilute sulfuric acid is added for the second time, and the vacuum degree is ≤460 mbar during the adding; 1.755% of dilute sulfuric acid is added for the third time, and the vacuum degree is ≤460 mbar during the adding; 1.404% of dilute sulfuric acid is added for the fourth time, and the vacuum degree is ≤460 mbar during the adding; 0.351% of dilute sulfuric acid is added for the fifth time, and the vacuum degree is ≤270 mbar during the adding; the stirring is needed during the whole process of adding dilute sulfuric acid, and the whole process of adding acid lasts for 9-10 minutes; after the adding of dilute sulfuric acid is completed, the stirring is needed for five times: the first stirring lasts for 48 seconds, and the vacuum degree is ≤180 mbar; the second stirring lasts for 48 seconds, and the vacuum degree is ≤150 mbar; the third stirring lasts for 48 seconds, and the vacuum degree is ≤130 mbar; the fourth stirring lasts for 48 seconds, and the vacuum degree is ≤110 mbar; the fifth stirring lasts for 48 seconds, and the vacuum degree is ≤90 mbar; after the stirring is completed, the specific gravity of the lead paste is detected, and the specific gravity of the lead paste is 4.42-4.46 g / cm 3 and the out-paste temperature is ≤50°C; The detection method of the above specific gravity is as follows: A cylindrical special lead paste specific density measuring cup with a known weight W1 and an internal volume V is used, the lead paste is taken from the pot and put into the measuring cup and is tamped, the excess lead paste on the mouth is scraped from the center to the periphery with a small spatula, the lead paste on the mouth is scraped flat, the excess lead paste adhered to the outer wall is scraped off with a small spatula, and then the total weight W2 is accurately weighed with an electronic scale; the calculation formula is wherein ρ is the specific density of the lead paste, and the unit is g / cm 3 ; V is the internal volume of the specific density measuring cup, and the unit is cm 3 ; W1 is the empty cup weight of the specific density measuring cup, and the unit is g; W2 is the total weight of the specific density measuring cup after the lead paste is put in, and the unit is g.

[0023] Then the prepared lead paste A and lead paste B are mixed and stirred for 5-8 minutes at a weight ratio of 1:5 to obtain a composite lead paste, and the composite lead paste is coated on the positive plate to obtain a lead paste coated plate.

[0024] Finally, the lead paste coated plate is cured and dried according to the table below to obtain a positive plate.

[0025] The following is the record table of the curing and drying process of the present embodiment: . Example 2:

[0026] The preparation process of the high-temperature-resistant positive plate of the lead-acid storage battery provided in this embodiment is consistent with that of Embodiment 1, and only the formula amount of lead paste A and lead paste B is inconsistent, that is, cerous sulfate 0.55%, antimony trioxide 0.55%, lead powder 82.49%, dilute sulfuric acid 7.52%, and pure water 8.89% are taken as raw material components of lead paste A; Graphite 0.24%, activated carbon fiber 0.10%, 4BS power seed 0.10%, red lead 2.72%, lead powder 80.53%, dilute sulfuric acid 7.53%, and pure water 8.78% are taken as raw material components of lead paste B. Embodiment 3:

[0027] The preparation process of the high-temperature-resistant positive plate of the lead-acid storage battery provided in this embodiment is also consistent with that of Embodiment 1, and only the formula amount of lead paste A and lead paste B is inconsistent, that is, cerous sulfate 0.51%, antimony trioxide 0.50%, lead powder 82.98%, dilute sulfuric acid 7.98%, and pure water 8.03% are taken as raw material components of lead paste A; Graphite 0.27%, activated carbon fiber 0.12%, 4BS power seed 0.12%, red lead 2.95%, lead powder 80.08%, dilute sulfuric acid 7.92%, and pure water 8.54% are taken as raw material components of lead paste B.

[0028] The positive plates prepared in Embodiments 1-3 are continuously circulated to prepare 48V20Ah lead-acid storage batteries, and the negative plates, separator paper, electrolyte, and formation processes used in the three schemes are the same. A benchmark enterprise 48V20Ah group is purchased from the market as a comparative example. Four groups of finished batteries are placed in a constant temperature box at (40±2) °C and subjected to life cycle tests according to the requirements of GB / T 22199.1-2017. The life cycle is terminated when the discharge time is less than or equal to 96 min. The data are shown in the following table: ; As can be seen from the above table, in a working environment of 40°C, the cycle times of the three groups of batteries using the high-temperature-resistant positive plate of the lead-acid storage battery prepared by the present application are better than those of ordinary batteries, and the cycle life is improved by 30%, which is obvious. Therefore, the high-temperature-resistant positive plate of the lead-acid storage battery prepared by the present application directly solves the industry pain point of the rapid shortening of the service life of lead-acid storage batteries in high-temperature regions (such as tropical regions) and high-temperature working conditions (such as communication base stations and new energy equipment). Not only can it reduce the frequency of battery replacement and reduce the user's use cost, but also can reduce the air conditioning cooling energy consumption (such as communication base stations), and expand the application scenarios of lead-acid storage batteries.

Claims

1. A high-temperature resistant lead-acid battery positive plate, comprising lead paste A and lead paste B, characterized in that, The weight ratio of lead paste A to lead paste B is 1:

5. Lead paste A, by weight percentage, comprises: 0.5-0.6% cerium sulfate, 0.5-0.6% antimony trioxide, 7-8% dilute sulfuric acid, 7.8-9.5% pure water, and the balance being lead powder. Lead paste B, by weight percentage, comprises: 0.20-0.27% graphite, 0.08-0.12% activated carbon fiber, 0.08-0.12% 4BS power seeds, 2.5-3.0% red lead, 7-8% dilute sulfuric acid, 8.5-9.5% pure water, and the balance being lead powder.

2. The high-temperature resistant lead-acid battery positive plate according to claim 1, characterized in that, The cerium sulfate meets the analytical grade requirements in HGB3204-1960; the antimony trioxide meets the grade 99.80 requirements in GB / T 4062-2013.

3. The high-temperature resistant lead-acid battery positive plate according to claim 1, characterized in that, The graphite meets the requirements for high-purity graphite in GB / T 3518-2008; the diameter and length of the activated carbon fiber are 10-15 nm and 2.5-3.0 mm, respectively; the 4BS power seeds are white or light yellow crystalline powder with a particle size ≤3 μm and a purity ≥98%, wherein the impurities of iron, copper, and chlorine are ≤0.001%; ​​the red lead meets the requirements for other first-grade industrial products in HG / T3850-2006.

4. The high-temperature resistant lead-acid battery positive plate according to claim 1, characterized in that, The dilute sulfuric acid has a density of 1.400±0.001 g / mL at 25°C; the pure water has a conductivity ≤2 μS / cm; the lead powder has an oxidation degree of 73-78% and its lead raw material grade is Pb99.

994.

5. A method for preparing a high-temperature resistant lead-acid battery positive electrode plate according to any one of claims 1-4, characterized in that, The specific steps are as follows: S1. Preparation of lead paste A: Cerium sulfate, antimony trioxide, lead powder, pure water, and dilute sulfuric acid are stirred and mixed to obtain lead paste A; S2. Preparation of lead paste B: Graphite, activated carbon fiber, 4BS power seeds, red lead, pure water, dilute sulfuric acid, and lead powder are stirred and mixed to obtain lead paste B; S3. Preparation of composite lead paste: Mix lead paste A obtained in S1 and lead paste B obtained in S2 at a weight ratio of 1:5 and stir for 5-8 minutes to obtain composite lead paste. S4. Preparation of lead paste coating plate: The composite lead paste is coated onto the positive electrode plate to obtain the lead paste coating plate; S5. Curing and drying: Curing and drying the lead paste coating plate will yield the positive electrode plate.

6. The method for preparing a high-temperature resistant lead-acid battery positive electrode plate according to claim 5, characterized in that, In S1, the specific mixing method of lead paste A is as follows: First, add the prescribed amount of lead powder, cerium sulfate, and antimony trioxide to the paste mixer and stir for 5-8 minutes; then add the prescribed amount of pure water to the paste mixer, with a total addition time of ≤3 minutes, during which stirring is required; after the pure water is added, continue stirring for 5-8 minutes, then add the prescribed amount of dilute sulfuric acid, with a total addition time of 11-15 minutes, during which stirring is required; after the dilute sulfuric acid is added, continue stirring for another 5-8 minutes, and check the specific gravity and discharge temperature of the lead paste.

7. The method for preparing a high-temperature resistant lead-acid battery positive electrode plate according to claim 6, characterized in that, In S1, the apparent specific gravity of the lead paste is 4.40–4.44 g / cm³. 3 The discharge temperature is ≤50℃.

8. The method for preparing a high-temperature resistant lead-acid battery positive electrode plate according to claim 5, characterized in that, In S2, the specific mixing method of lead paste B is as follows: First, add the prescribed amounts of lead powder, graphite, activated carbon fiber, 4BS power seeds, and red lead to the paste mixer and stir for 4-6 minutes; then add the prescribed amount of pure water to the paste mixer, with a total addition time of ≤90 seconds, during which stirring is required; after the pure water is added, continue stirring for 4-6 minutes, then add the prescribed amount of dilute sulfuric acid in five portions, with a total addition time of 9-10 minutes, during which stirring is required; after the dilute sulfuric acid is added, stir in five more portions; after stirring is completed, the specific gravity and discharge temperature of the lead paste can be measured.

9. The method for preparing a high-temperature resistant lead-acid battery positive electrode plate according to claim 8, characterized in that, In S2, the dilute sulfuric acid is added in five portions according to the following formula: the first addition is 25% of the formula amount, during which the vacuum degree is ≤460mbar; the second addition is 25% of the formula amount, during which the vacuum degree is ≤460mbar; The third addition is 25% of the formula, with a vacuum level ≤460mbar during the process; the fourth addition is 20% of the formula, with a vacuum level ≤460mbar during the process; the fifth addition is 5% of the formula, with a vacuum level ≤270mbar during the process.

10. The method for preparing a high-temperature resistant lead-acid battery positive electrode plate according to claim 8, characterized in that, In S2, after the dilute sulfuric acid is added, the five stirrings are as follows: the first stirring is for 48 seconds, with a vacuum degree ≤180mbar; the second stirring is for 48 seconds, with a vacuum degree ≤150mbar; the third stirring is for 48 seconds, with a vacuum degree ≤130mbar; the fourth stirring is for 48 seconds, with a vacuum degree ≤110mbar; and the fifth stirring is for 48 seconds, with a vacuum degree ≤90mbar.

11. The method for preparing a high-temperature resistant lead-acid battery positive electrode plate according to claim 8, characterized in that, In S2, the apparent specific gravity of the lead paste is 4.42–4.46 g / cm³. 3 The discharge temperature is ≤50℃.