A lead-acid battery lead paste, a preparation method thereof, and a construction process

Abstract

The present invention relates to the field of lead-acid battery plate preparation, and particularly to a lead-acid battery lead paste, a preparation method and a construction process thereof. Among them, a lead-acid battery lead paste includes a positive plate lead paste and a negative plate lead paste. The positive plate lead paste comprises the following components in parts by weight: 2.5-3 parts of sodium perborate, 1-2 parts of graphite, 0.8-1 part of glass fiber, 950-1050 parts of lead powder, 80-90 parts of deionized water, 110-120 parts of dilute sulfuric acid, and 10-20 parts of alcohol powder. The present invention mixes alcohol powder into the lead paste, and the alcohol powder uniformly fills the inside of the lead paste. In this way, when constructing the surface of the plate, only by melting the alcohol powder with water mist can the lead paste layer have uniform and fine micropores. In this case, not only the stability of the lead paste layer is ensured, but also the porosity of the plate is increased with more micropores.

Description

Technical Field

[0001] The present invention relates to the field of preparation of lead - acid battery plates, and particularly to a lead paste for lead - acid batteries, a preparation method thereof, and a construction process thereof. Background Art

[0002] Lead - acid batteries have excellent performance such as maintenance - free and strong large - current discharge capacity. They are one of the important devices in automobiles, providing electrical energy for vehicle starting. Therefore, the capacity and large - current discharge capacity of lead - acid batteries are very important performance indicators.

[0003] The power supply capacity of the plates of lead - acid batteries is determined by the change in the concentration of the electrolyte, and the change in the electrolyte concentration depends on the result of the chemical reaction of the active substances on the positive plates. The currently adopted technical solution in the market is to form cavities by the evaporation of water in the lead paste, thereby increasing the porosity of the plates. Although this method can meet the requirement of increasing the porosity of the plates, the degree of cavitation is uncontrollable, which not only causes uneven thickness at various positions of the plates but also easily leads to damage to the lead - paste layer of the plates. Summary of the Invention

[0004] In view of the deficiencies of the existing technology, the present invention provides a lead paste for lead - acid batteries, a preparation method thereof, and a construction process thereof. The specific technical solutions are as follows:

[0005] A lead paste for lead - acid batteries includes a positive - plate lead paste and a negative - plate lead paste. The positive - plate lead paste comprises the following components in parts by weight:

[0006] 2.5 - 3 parts of sodium perborate, 1 - 2 parts of graphite, 0.8 - 1 part of glass fiber, 950 - 1050 parts of lead powder, 80 - 90 parts of deionized water, 110 - 120 parts of dilute sulfuric acid, and 10 - 20 parts of alcohol powder.

[0007] The negative - plate lead paste comprises the following components in parts by weight: 10 - 15 parts of barium sulfate, 0.8 - 1.2 parts of fiber, 1 - 3 parts of lignin, 3 - 5 parts of carbon black, 950 - 1050 parts of lead powder, 80 - 90 parts of deionized water, 110 - 120 parts of dilute sulfuric acid, and 15 - 30 parts of alcohol powder.

[0008] A preparation method of a lead paste for lead - acid batteries uses a lead paste for lead - acid batteries in the foregoing technical solution. The preparation method of the positive - plate lead paste includes the following steps:

[0009] S11: Put 2.5 - 3 parts of sodium perborate, 1 - 2 parts of graphite, 0.8 - 1 part of glass fiber, and 950 - 1050 parts of lead powder into a stirring pot, and dry - stir for 5 - 10 minutes to obtain mixture A.

[0010] S12: Add 80 - 90 parts of deionized water to mixture A and stir for 3 - 5 minutes to obtain mixture B.

[0011] S13: After adding 110 - 120 parts of dilute sulfuric acid with a density of 1.325 g / cm3 to mixture B, continue to stir for 5 - 10 minutes to obtain mixture C.

[0012] S14: Stir mixture C for 5 - 10 minutes, and uniformly add 10 - 20 parts of alcohol powder during the stirring process until the stirring ends to obtain lead paste.

[0013] The method for preparing the negative plate lead paste includes the following steps:

[0014] S21: Put 10 - 15 parts of barium sulfate, 0.8 - 1.2 parts of fiber, 1 - 3 parts of lignin, 3 - 5 parts of carbon black, and 950 - 1050 parts of lead powder into a stirring pot, and dry stir for 5 - 10 minutes to obtain mixture D.

[0015] S22: Add 80 - 90 parts of deionized water to mixture D and stir for 3 - 5 minutes to obtain mixture E.

[0016] S23: After adding 110 - 120 parts of dilute sulfuric acid with a density of 1.325 g / cm3 to mixture E, continue to stir for 5 - 10 minutes to obtain mixture F.

[0017] S24: Stir mixture F for 5 - 10 minutes, and uniformly add 15 - 30 parts of alcohol powder during the stirring process until the stirring ends to obtain lead paste.

[0018] As an improvement of the above technical solution, in the method for preparing the negative plate lead paste and the method for preparing the positive plate lead paste, the dilute sulfuric acid is continuously added within 13 - 15 minutes, and the mixture B is continuously stirred during the addition of the dilute sulfuric acid.

[0019] A construction process of lead paste for lead - acid batteries, using the lead paste obtained by any one of the methods for preparing lead paste for lead - acid batteries in the foregoing technical solutions, includes the following steps:

[0020] S31: Apply the lead paste on the plate once, and wet the surface of the applied lead paste with water mist for 5 - 10 minutes.

[0021] S32: Air - dry the surface of the lead paste layer in an air - cooling manner until there is no obvious moisture on the surface of the lead paste layer.

[0022] S33: Repeat steps S31 and S32 on the surface of the air - dried lead paste until the thickness of the lead paste covering the grid of the plate reaches 0.2 mm, and then trim the edge of the lead paste layer.

[0023] S34: Carry out solidification treatment on the trimmed plates to obtain the final products.

[0024] As an improvement of the above technical solution, the solidification treatment in step S34 includes the following steps:

[0025] After surface drying the plates coated with 0.2 mm thick lead paste obtained in step S33 under the condition of 170 - 220 °C, carry out solidification drying on the plates.

[0026] As an improvement of the above technical solution, the solidification drying adopts a medium-temperature and high-humidity solidification process, where the solidification time is 24 - 48 h, the solidification temperature is 50 °C, the relative humidity is 80 - 99%, the drying time is 20 - 24 h, and the drying temperature is 60 - 80 °C.

[0027] Advantages of the present invention:

[0028] The present invention mixes alcohol powder into the lead paste, and the alcohol powder evenly fills the inside of the lead paste. In this way, when only constructing the surface of the plates, melting the alcohol powder with water mist can make the lead paste layer have uniform and fine micropores. In this case, not only the stability of the lead paste layer is ensured, but also more micropores are used to increase the porosity of the plates, which is beneficial to the diffusion of sulfuric acid inside the plates, increases the reaction area between the lead paste and sulfuric acid, and improves the capacity and high-current discharge ability of the plates. Specific embodiments

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] In the prior art, the generally adopted technical solution is to form cavities by evaporating the water in the lead paste to increase the porosity of the plates. Although this method can meet the requirement of increasing the porosity of the plates, the degree of cavities is uncontrollable, which not only causes uneven thickness at various positions of the plates, but also easily leads to damage to the lead paste layer of the plates.

[0031] Embodiment 1

[0032] To solve the above problems, a lead-acid battery lead paste is provided, including a positive plate lead paste and a negative plate lead paste.

[0033] Among them, the positive plate lead paste includes the following components in parts by weight:

[0034] 2.5 parts of sodium perborate, 1 part of graphite, 0.8 part of glass fiber, 950 parts of lead powder, 80 parts of deionized water, 110 parts of dilute sulfuric acid, and 10 parts of alcohol powder.

[0035] The negative electrode plate lead paste comprises the following components in parts by weight:

[0036] 10 parts of barium sulfate, 0.8 part of fiber, 1 part of lignin, 3 parts of carbon black, 950 parts of lead powder, 80 parts of deionized water, 110 parts of dilute sulfuric acid and 15 parts of alcohol powder.

[0037] In order to cooperate with a lead-acid battery lead paste in the foregoing technical solution, a preparation method of a lead-acid battery lead paste is provided. The preparation method of the positive electrode plate lead paste comprises the following steps:

[0038] S11: Put 2.5 parts of sodium perborate, 1 part of graphite, 0.8 part of glass fiber and 950 parts of lead powder into a stirring pot, and dry stir for 5 - 10 minutes to obtain a mixture A.

[0039] The mixture A is obtained by dry stirring. The purpose of treating it in the dry stirring manner is to ensure uniform mixing among various materials and avoid insufficient mixing among the materials of each component caused by contact with moisture and dissolution.

[0040] S12: Add 80 parts of deionized water to the mixture A and stir for 3 - 5 minutes to obtain a mixture B.

[0041] S13: After adding 110 parts of dilute sulfuric acid with a density of 1.325 g / cm3 to the mixture B, continue to stir for 5 - 10 minutes to obtain a mixture C.

[0042] Dissolve and mix the materials of each component with deionized water, add dilute sulfuric acid and stir, and finally obtain a paste-like mixture C.

[0043] S14: Stir the mixture C for 5 - 10 minutes, and uniformly add 10 parts of alcohol powder during the stirring until the stirring ends to obtain the lead paste.

[0044] The mixture C in step S13 is a lead paste prepared by a traditional method, and there is a certain amount of moisture inside it. In order to avoid the contact between moisture and alcohol powder resulting in the complete dissolution of alcohol powder, the alcohol powder cannot be directly added, but is continuously added during the stirring process. During the stirring process, the moisture inside the mixture C flows to the bottom of the stirring pot due to gravity and stirring. Part of the continuously added alcohol powder directly contacts and dissolves with the moisture remaining in the mixture C and releases gas, causing pores to appear inside the mixture C. The other part remains uniformly in the mixture C without dissolution. Finally, the prepared lead paste not only has more pores inside, but also still retains more alcohol powder inside.

[0045] The preparation method of the negative electrode plate lead paste comprises the following steps:

[0046] S21: Put 10 parts of barium sulfate, 0.8 parts of fiber, 1 part of lignin, 3 parts of carbon black, and 950 parts of lead powder into a stirring pot, and dry stir for 5 - 10 minutes to obtain mixture D.

[0047] S22: Add 80 parts of deionized water to mixture D and stir for 3 - 5 minutes to obtain mixture E.

[0048] S23: After adding 110 parts of dilute sulfuric acid with a density of 1.325 g / cm3 to mixture E, continue to stir for 5 - 10 minutes to obtain mixture F.

[0049] S24: Stir mixture F for 5 - 10 minutes, and uniformly add 15 parts of alcohol powder during the stirring process until the stirring ends to obtain lead paste.

[0050] Similar to the production of the positive plate lead paste, for the negative plate lead paste, alcohol powder is continuously added at the end so that the alcohol powder can be mixed inside the lead paste.

[0051] In one embodiment, to ensure that the dilute sulfuric acid can be evenly incorporated into mixture B, in the preparation method of the negative plate lead paste and the preparation method of the positive plate lead paste, the dilute sulfuric acid is continuously added within 13 - 15 minutes, and mixture B is continuously stirred during the addition of the dilute sulfuric acid.

[0052] Based on the lead paste obtained by the preparation method of a lead - acid battery lead paste in the foregoing technical solution, further process the electrode plate. For this purpose, a construction process of a lead - acid battery lead paste is provided, including the following steps:

[0053] S31: Apply a layer of lead paste on the electrode plate, and wet the surface of the lead paste layer with water mist for 5 - 10 minutes.

[0054] The lead paste applied here is a very thin layer, so the alcohol powder inside the lead paste is completely exposed on the outer surface. In this case, when wetting with water mist, the water mist will adhere to the surface of the lead paste layer, the water mist will condense into water droplets, and the water droplets will contact and dissolve with the alcohol powder to form liquid alcohol.

[0055] S32: Air - dry the surface of the lead paste layer in an air - cooling manner until there is no obvious moisture on the surface of the lead paste layer.

[0056] The purpose of air - drying with air - cooling is to avoid uncontrollable reactions at high temperatures. Air - cooling air - drying can not only solve the problem of residual liquid alcohol, but also avoid uncontrollable chemical reactions inside the lead paste layer.

[0057] S33: Repeat steps S31 and S32 on the surface of the air-dried lead paste until the thickness of the lead paste covering the grid of the electrode plate reaches 0.2 mm, and then trim the lead paste layer.

[0058] In the above operation, the coating of the lead paste is relatively thin and cannot meet the requirements. Applying a single coat of lead paste that meets the requirements will cause the alcohol powder inside it to be unable to contact and dissolve with the water mist. Therefore, several operations of applying the lead paste and dissolving the alcohol powder with the water mist are required until the final thickness of the lead paste reaches 0.2 mm.

[0059] Since uniform pores appear on the surface of the lead paste layer after each application, water mist treatment, and air cooling treatment, and uneven edges and surfaces may occur after multiple applications, trimming treatment is required, that is, to ensure that the lead paste layer can fit and cover the edges of the positive electrode plate or the negative electrode plate.

[0060] S34: Cure the trimmed electrode plate to obtain the final product X.

[0061] The cured lead paste layer has a more uniform porosity, which not only ensures the stability of the lead paste layer but also increases the porosity of the electrode plate with more micropores, facilitating the diffusion of sulfuric acid inside the electrode plate, increasing the reaction area between the lead paste and sulfuric acid, and improving the capacity and high-current discharge ability of the electrode plate.

[0062] Example Two

[0063] To distinguish from Example One, a lead-acid battery lead paste is provided, including a positive electrode plate lead paste and a negative electrode plate lead paste. The positive electrode plate lead paste includes the following components in parts by weight:

[0064] 2.8 parts of sodium perborate, 1.5 parts of graphite, 0.9 parts of glass fiber, 1000 parts of lead powder, 85 parts of deionized water, 115 parts of dilute sulfuric acid, and 15 parts of alcohol powder.

[0065] The negative electrode plate lead paste includes the following components in parts by weight:

[0066] 13 parts of barium sulfate, 1 part of fiber, 2 parts of lignin, 4 parts of carbon black, 1000 parts of lead powder, 85 parts of deionized water, 115 parts of dilute sulfuric acid, and 20 parts of alcohol powder.

[0067] To cooperate with a lead-acid battery lead paste in the foregoing technical solution, a preparation method of a lead-acid battery lead paste is provided. The preparation method of the positive electrode plate lead paste includes the following steps:

[0068] S11: Put 2.8 parts of sodium perborate, 1.5 parts of graphite, 0.9 parts of glass fiber, and 1000 parts of lead powder into a stirring pot and dry stir for 5 - 10 minutes to obtain mixture A.

[0069] S12: Add 85 parts of deionized water to mixture A and stir for 3 - 5 minutes to obtain mixture B.

[0070] S13: After adding 115 parts of dilute sulfuric acid with a density of 1.325 g / cm3 to mixture B, continue to stir for 5 - 10 minutes to obtain mixture C.

[0071] S14: Stir mixture C for 5 - 10 minutes, and uniformly add 15 parts of alcohol powder during the stirring process until the stirring ends to obtain the lead paste.

[0072] The method for preparing the negative plate lead paste includes the following steps:

[0073] S21: Put 13 parts of barium sulfate, 1 part of fiber, 2 parts of lignin, 4 parts of carbon black, and 1000 parts of lead powder into a stirring pot, and dry stir for 5 - 10 minutes to obtain mixture D.

[0074] S22: Add 85 parts of deionized water to mixture D and stir for 3 - 5 minutes to obtain mixture E.

[0075] S23: After adding 115 parts of dilute sulfuric acid with a density of 1.325 g / cm3 to mixture E, continue to stir for 5 - 10 minutes to obtain mixture F.

[0076] S24: Stir mixture F for 5 - 10 minutes, and uniformly add 20 parts of alcohol powder during the stirring process until the stirring ends to obtain the lead paste.

[0077] In the method for preparing the negative plate lead paste and the method for preparing the positive plate lead paste, the dilute sulfuric acid is continuously added within 13 - 15 minutes, and the mixture B is continuously stirred during the addition of the dilute sulfuric acid.

[0078] Based on the lead paste obtained by the method for preparing the lead paste of a lead - acid battery in one of the foregoing technical solutions, further process the electrode plate. For this purpose, a construction process for the lead paste of a lead - acid battery is provided, including the following steps:

[0079] S31: Apply the lead paste on the electrode plate once, and wet the surface of the lead paste layer with water mist for 5 - 10 minutes.

[0080] S32: Air - dry the surface of the lead paste layer in an air - cooling manner until there is no obvious moisture on the surface of the lead paste layer.

[0081] S33: Repeat step S31 and step S32 on the surface of the air - dried lead paste until the thickness of the lead paste covering the grid of the electrode plate reaches 0.2 mm, and then trim the lead paste layer.

[0082] S34: Curing the edge-trimmed electrode plate to obtain the final product Y.

[0083] Example 3

[0084] To distinguish from Example 1 and Example 2, a lead-acid battery lead paste is provided, including positive electrode plate lead paste and negative electrode plate lead paste. The positive electrode plate lead paste includes the following components in parts by weight:

[0085] 3 parts of sodium perborate, 2 parts of graphite, 1 part of glass fiber, 1050 parts of lead powder, 90 parts of deionized water, 120 parts of dilute sulfuric acid, and 20 parts of alcohol powder.

[0086] The negative electrode plate lead paste includes the following components in parts by weight:

[0087] 15 parts of barium sulfate, 1.2 parts of fiber, 3 parts of lignin, 5 parts of carbon black, 1050 parts of lead powder, 90 parts of deionized water, 120 parts of dilute sulfuric acid, and 30 parts of alcohol powder.

[0088] To cooperate with a lead-acid battery lead paste in the foregoing technical solution, a preparation method of a lead-acid battery lead paste is provided. The preparation method of the positive electrode plate lead paste includes the following steps:

[0089] S11: Put 3 parts of sodium perborate, 2 parts of graphite, 1 part of glass fiber, and 1050 parts of lead powder into a stirring pot, and dry stir for 5 - 10 minutes to obtain mixture A.

[0090] S12: Add 90 parts of deionized water to mixture A and stir for 3 - 5 minutes to obtain mixture B.

[0091] S13: After adding 120 parts of dilute sulfuric acid with a density of 1.325 g / cm3 to mixture B, continue to stir for 5 - 10 minutes to obtain mixture C.

[0092] S14: Stir mixture C for 5 - 10 minutes, and uniformly add 20 parts of alcohol powder during the stirring until the stirring ends to obtain the lead paste.

[0093] The preparation method of the negative electrode plate lead paste includes the following steps:

[0094] S21: Put 15 parts of barium sulfate, 1.2 parts of fiber, 3 parts of lignin, 5 parts of carbon black, and 1050 parts of lead powder into a stirring pot, and dry stir for 5 - 10 minutes to obtain mixture D.

[0095] S22: Add 90 parts of deionized water to mixture D and stir for 3 - 5 minutes to obtain mixture E.

[0096] S23: After adding 120 parts of dilute sulfuric acid with a density of 1.325 g / cm3 to mixture E, continue to stir for 5 - 10 minutes to obtain mixture F.

[0097] S24: Stir mixture F for 5 - 10 minutes, and uniformly add 30 parts of alcohol powder during the stirring process until the stirring ends to obtain the lead paste.

[0098] In the method for preparing the negative plate lead paste and the method for preparing the positive plate lead paste, the dilute sulfuric acid is continuously added within 13 - 15 minutes, and the mixture B is continuously stirred during the addition of the dilute sulfuric acid.

[0099] Based on the lead paste obtained by the method for preparing the lead paste of a lead-acid battery in one of the foregoing technical solutions, further process the electrode plate. For this purpose, a construction process for the lead paste of a lead-acid battery is provided, including the following steps:

[0100] S31: Coat the electrode plate with the lead paste once, and wet the surface of the lead paste layer with water mist for 5 - 10 minutes.

[0101] S32: Air-dry the surface of the lead paste layer in an air-cooling manner until there is no obvious moisture on the surface of the lead paste layer.

[0102] S33: Repeat steps S31 and S32 on the surface of the air-dried lead paste until the thickness of the lead paste covering the grid of the electrode plate reaches 0.2 mm, and then trim the lead paste layer.

[0103] S34: Cure the electrode plate after the trimming process to obtain the final product Z.

[0104] In the foregoing Examples 1, 2, and 3, the curing process in step S34 includes the following steps:

[0105] After surface-drying the electrode plate coated with 0.2 mm thick lead paste obtained in step S33 at 170 - 220 °C, cure and dry the electrode plate.

[0106] In one embodiment, the curing and drying adopt a medium-temperature and high-humidity curing process, where the curing time is 24 - 48 h, the curing temperature is 50 °C, the relative humidity is 80 - 99%, the drying time is 20 - 24 h, and the drying temperature is 60 - 80 °C.

[0107] Due to the large differences in different geographical locations and different workshop environments, the curing environment of the medium-temperature and high-humidity curing process is a relative value, that is, each condition parameter of its curing environment is adjusted according to actual processing, and the adjustment range is within the range values given above.

[0108] Since the specific implementation of Embodiments 1, 2, and 3 does not depend on the reaction of each component, but is based on the property that the added alcohol powder dissolves in water and forms micropores by wetting the lead paste layer with water mist, the more alcohol powder is added, the higher the porosity inside the formed lead paste layer. However, it is necessary to ensure the stability of the lead paste layer structure, that is, it is necessary to limit the proportion of the alcohol powder in the total amount to avoid excessive alcohol powder squeezing the space, resulting in a cavity without support inside the structure after the alcohol powder dissolves, and further leading to the problem that the lead paste layer loses its support strength.

[0109] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lead-acid battery lead paste, including a positive plate lead paste and a negative plate lead paste, characterized in that: The positive plate lead paste includes the following components in parts by weight: 2.5 - 3 parts of sodium perborate, 1 - 2 parts of graphite, 0.8 - 1 part of glass fiber, 950 - 1050 parts of lead powder, 80 - 90 parts of deionized water, 110 - 120 parts of dilute sulfuric acid, and 10 - 20 parts of alcohol powder; The negative plate lead paste includes the following components in parts by weight: 10 - 15 parts of barium sulfate, 0.8 - 1.2 parts of fiber, 1 - 3 parts of lignin, 3 - 5 parts of carbon black, 950 - 1050 parts of lead powder, 80 - 90 parts of deionized water, 110 - 120 parts of dilute sulfuric acid, and 15 - 30 parts of alcohol powder; The construction process of the lead-acid battery lead paste includes the following steps: S31: Apply the lead paste on the plate once, and wet the surface of the lead paste layer with water mist for 5 - 10 minutes; S32: Air-dry the surface of the lead paste layer in an air-cooling manner until there is no obvious moisture on the surface of the lead paste layer; S33: Repeat steps S31 and S32 on the surface of the air-dried lead paste until the thickness of the lead paste covering the plate grid reaches 0.2 mm, and then trim the lead paste layer; S34: Cure the trimmed plate to obtain the final product.

2. A preparation method of lead-acid battery lead paste, using the lead-acid battery lead paste as described in claim 1, characterized in that: The preparation method of the positive plate lead paste includes the following steps: S11: Put 2.5 - 3 parts of sodium perborate, 1 - 2 parts of graphite, 0.8 - 1 part of glass fiber, and 950 - 1050 parts of lead powder into a stirring pot, and dry stir for 5 - 10 minutes to obtain mixture A; S12: Add 80 - 90 parts of deionized water to mixture A and stir for 3 - 5 minutes to obtain mixture B; S13: After adding 110 - 120 parts of dilute sulfuric acid with a density of 1.325 g / cm3 to mixture B, continue to stir for 5 - 10 minutes to obtain mixture C; S14: Stir mixture C for 5 - 10 minutes, and evenly add 10 - 20 parts of alcohol powder during the stirring process until the stirring ends to obtain the lead paste.

3. The preparation method of the lead paste of a lead-acid battery according to claim 2, characterized in that: The preparation method of the negative plate lead paste includes the following steps: S21: Put 10 - 15 parts of barium sulfate, 0.8 - 1.2 parts of fiber, 1 - 3 parts of lignin, 3 - 5 parts of carbon black, and 950 - 1050 parts of lead powder into a stirring pot, and dry stir for 5 - 10 minutes to obtain mixture D; S22: Add 80 - 90 parts of deionized water to mixture D and stir for 3 - 5 minutes to obtain mixture E; S23: After adding 110 - 120 parts of dilute sulfuric acid with a density of 1.325 g / cm3 to mixture E, continue to stir for 5 - 10 minutes to obtain mixture F; S24: Stir mixture F for 5 - 10 minutes, and evenly add 15 - 30 parts of alcohol powder during the stirring process until the stirring ends to obtain the lead paste.

4. The preparation method of a lead-acid battery lead paste according to claim 3, characterized in that: In the preparation method of the negative plate lead paste and the preparation method of the positive plate lead paste, the dilute sulfuric acid is continuously added within 13 - 15 minutes, and the mixture B is continuously stirred during the addition of the dilute sulfuric acid.

5. The construction process of a lead-acid battery lead paste according to claim 1, characterized in that: The curing process in step S34 includes the following steps: After surface drying the electrode plate coated with 0.2 mm thick lead paste obtained in step S33 under the condition of 170 - 220 °C, cure and dry the electrode plate.

6. The construction process of a lead-acid battery lead paste according to claim 5, characterized in that: The cure and dry adopt a medium-temperature and high-humidity curing process, where the curing time is 24 - 48 h, the curing temperature is 50 °C, the relative humidity is 80 - 99%, the drying time is 20 - 24 h, and the drying temperature is 60 - 80 °C.