Partition plate for lead storage battery and high-performance power type lead storage battery

Abstract

According to the partition plate for the lead storage battery and the high-performance power type lead storage battery, benzidine modified polyethylene terephthalate fibers are used for manufacturing the lead-acid battery diaphragm, the chemical stability and mechanical performance of the fibers are enhanced, and the overall stability and reliability of the battery are improved; the special structure and modified components of the fiber optimize the ion transmission path in the lead-acid battery, change the charge distribution and pore structure on the surface of the fiber, enable sulfate ions and the like to migrate more smoothly, improve the charge-discharge efficiency, reduce the energy loss and improve the power performance of the battery, and particularly, the performance is excellent during high-current charge-discharge; the fiber material may have flame retardance and thermal stability, and can prevent heat from diffusing and spreading and reduce the risk of thermal runaway when the internal temperature of the battery rises due to overcharge, overdischarge and other abnormities.

Description

Technical Field

[0001] The present invention belongs to the technical field of lead-acid batteries, and particularly relates to a separator for lead-acid batteries and a high-performance power-type lead-acid battery. Background Art

[0002] Due to its mature technical system, low cost, high reliability, and convenient recycling, lead-acid batteries are still widely used in the field of power batteries.

[0003] However, traditional lead-acid battery technology has certain limitations in aspects such as high-rate discharge, deep cycling, and vibration resistance performance, which are mainly reflected in the following aspects: 1) Insufficient high-rate discharge capacity When the existing lead-acid batteries perform high-rate discharge, the utilization rate of the active material in the electrode plate is not high, and the internal resistance of the battery is relatively large, resulting in a significant drop in the output voltage, which cannot meet the requirements of vehicle starting or short-time high-power output. Especially under extreme temperature and frequent start-stop working conditions, the battery performance deteriorates more rapidly.

[0004] 2) Limited cycle life During the long-term cyclic use of traditional lead-acid batteries, due to the accumulation of the phenomenon of electrode plate sulfation, the capacity gradually decays and the service life is shortened. Especially under deep discharge and high-rate working conditions, problems such as the stripping of the active material on the electrode plate, grid corrosion, and lead dendrite growth are more prominent, which directly affects the durability and safety of the battery.

[0005] 3) Vibration resistance and structural stability problems In automotive and other power application scenarios, the battery often needs to withstand large vibrations and impacts. There are certain deficiencies in the electrode plates produced by traditional processes and the assembly process, which are likely to cause potential safety hazards such as internal structure loosening, electrolyte leakage, or local short circuits. Therefore, improving the vibration resistance and overall structural stability of lead-acid batteries has become an important technical problem that needs to be solved urgently.

[0006] The battery separator is an important component of lead-acid batteries, and its performance will directly affect the performance of lead-acid batteries. At present, many studies have been carried out at home and abroad to improve the battery performance by modifying the separator.

[0007] For example, the patent application with the publication number CN1398008A discloses a method for modifying an ultra-fine glass fiber separator for lead-acid batteries, which hydrophobically modifies the ultra-fine glass fiber separator using a hydrophobic organic polymer, polytetrafluoroethylene emulsion. The ultra-fine glass fiber separator treated by this application provides a lateral channel for gas alone, improves the gas permeability of the separator, effectively increases the gas recombination efficiency of VRLA batteries, reduces the internal pressure of the batteries, decreases the number of valve openings, avoids the drying out of the batteries, extends the service life of the batteries, and has a relatively low cost.

[0008] Also, for example, the patent application with the publication number CN114497885A discloses a production process for an ultra-fine glass fiber battery separator: S001, preparation of a phenolic resin adhesive; S002, preparation of an ultra-fine glass fiber mat; S003, preparation of the battery separator. This application modifies the phenolic resin adhesive using phenol, formaldehyde, and graphene oxide as raw materials to obtain a modified phenolic resin adhesive, sprays the phenolic resin adhesive on the ultra-fine glass fiber secondary filaments, effectively improves the strength, tensile properties, and high-temperature resistance of the battery separator, and homogenizes the ultra-fine glass fiber mat multiple times to improve the uniformity of the battery separator, thereby increasing the service life of lead-acid batteries.

[0009] However, there is still room for improvement in the high-rate discharge capacity, cycle life, vibration resistance, and structural stability of lead-acid batteries. Therefore, it is still of great significance to find new methods for modifying battery separators. Summary of the Invention

[0010] To solve the above-mentioned technical problems existing in the prior art, the present invention provides a separator for lead-acid batteries and a high-performance power-type lead-acid battery.

[0011] The present invention first provides a method for preparing benzidine-modified polyethylene terephthalate fibers, including the following steps, where the parts are by mass: (1) Place 100 - 140 parts of polyester fibers in 1000 - 1300 parts of dichloroethane, stir evenly, then add 10 - 20 parts of maleic anhydride and 5 - 10 parts of aluminum chloride, and carry out an acylation reaction; (2) Add 11 - 22 parts of diaminobenzidine, 0.04 - 0.5 parts of triethylboron - diethylenetriamine, and 2 - 5 parts of potassium hydroxide to the above reaction system, mix evenly, and react; (3) After the reaction is completed, filter and separate the fibers obtained from the reaction, wash to remove unreacted substances, and dry to obtain benzidine-modified polyethylene terephthalate fibers.

[0012] Preferably, in step (1), the reaction temperature is 35 - 45 °C, and the reaction time is 10 - 15 hours.

[0013] Preferably, in step (2), the reaction temperature is 65 - 70 °C and the reaction time is 5 - 10 hours.

[0014] The present invention provides ethylene glycol terephthalate fiber modified with benzidine prepared by the above preparation method.

[0015] The present invention also provides a separator for a lead - acid battery, the components of which include glass fiber and the above - mentioned ethylene glycol terephthalate fiber modified with benzidine. Among them, the added mass percentage of the ethylene glycol terephthalate fiber modified with benzidine is 7% - 9%.

[0016] Preferably, the added mass percentage of the ethylene glycol terephthalate fiber modified with benzidine is 9%.

[0017] The present invention also provides a high - performance power lead - acid battery, which includes a battery stack. The battery stack includes a positive plate, a negative plate and the above - mentioned separator for a lead - acid battery.

[0018] Preferably, the positive plate includes a positive grid and positive lead paste, and the negative plate includes a negative grid and negative lead paste. By mass, the formula of the positive grid includes: 0.10 - 2.0 parts of tin, 0.05 - 0.10 parts of antimony, 0.005 - 0.02 parts of bismuth, 0.005 - 0.05 parts of selenium, and the balance is lead; by mass, the formula of the negative grid includes: 0.10 - 0.15 parts of calcium, 0.10 - 0.80 parts of tin, 0.02 - 0.03 parts of aluminum, and the balance is lead.

[0019] Preferably, both the positive grid and the negative grid are prepared by the continuous rolling and punching method. Among them, the thickness of the lead strip rolled for the positive grid is 0.70 ± 0.01 mm; the thickness of the lead strip rolled for the negative grid is 0.55 ± 0.01 mm; during the rolling process of the positive grid and the negative grid, the temperature is controlled at 80 - 120 °C, the rolling speed is controlled at 0.5 - 2.0 m / s, and the rolling pressure is controlled at 50 - 150 MPa.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1) Improve battery performance and stability The ethylene glycol terephthalate fiber modified with benzidine is used to make the separator of the lead - acid battery, enhancing the chemical stability and mechanical properties of the fiber. The improved chemical stability enables it to better resist the corrosion of sulfuric acid electrolyte, extend the service life of the separator, and improve the overall stability and reliability of the battery; the good mechanical properties can ensure the integrity of the separator structure, prevent short - circuit between the positive and negative electrodes, and ensure the safe operation of the battery.

[0021] 2) Optimize battery performance The special structure and modified components of the fiber optimize the ion transport path inside the lead-acid battery, change the surface charge distribution and pore structure of the fiber, make the migration of sulfate ions and others smoother, improve the charge-discharge efficiency, reduce energy loss, enhance the battery power performance, and especially perform excellently during high-current charge and discharge. Meanwhile, during the charge-discharge cycle of the battery, it can inhibit the shedding of the electrode active material and the growth of lead sulfate crystals, maintain the activity and stability of the electrode, extend the cycle life, and reduce the capacity attenuation rate.

[0022] 3) Enhance the battery safety and consistency The fiber material may possess flame retardancy and thermal stability. When the internal temperature of the battery rises due to abnormalities such as overcharge and over-discharge, it can prevent the spread of heat, reduce the risk of thermal runaway, and reduce safety accidents such as fires. Moreover, using this fiber to manufacture components such as diaphragms can improve the production consistency of lead-acid batteries, make the performance of different batches of batteries closer, facilitate the combined use of battery packs, and enhance the overall performance and service life of the battery pack. Specific implementation methods

[0023] Example 1

[0024] Preparation method of high-performance power-type lead-acid battery (1) Preparation of positive and negative electrode grid alloys Under vacuum melting conditions, the positive plate alloy and the negative plate alloy are melted and prepared according to the following mass ratio. The positive plate alloy and the negative plate alloy are calculated based on a total of 100 kg each: Positive plate alloy: Tin (Sn): 0.50 kg; Antimony (Sb): 0.06 kg; Bismuth (Bi): 0.01 kg; Selenium (Se): 0.01 kg; The balance is lead (Pb).

[0025] Negative plate alloy: Calcium (Ca): 0.12 kg; Tin (Sn): 0.60 kg; Aluminum (Al): 0.025 kg; The balance is lead (Pb).

[0026] The melting temperature is controlled at 700 °C, and the melting time is 1.5 hours.

[0027] (2) Strip rolling The positive plate lead strip is rolled with a calcium-free alloy, and the thickness is controlled at 0.70 mm; the negative plate lead strip is rolled with a high-calcium low-tin alloy, and the thickness is controlled at 0.55 mm. During the rolling process, the temperature is set at 100 °C, the rolling speed is 1.0 m / s, and the rolling pressure is 100 MPa.

[0028] (3) Continuous punching of strip to form grid The positive plate lead strip directly enters the pasting process after stamping; the negative plate lead strip is placed in an oven at 90 °C for 10 hours of aging treatment after stamping.

[0029] (4) Pasting and curing The positive plate lead paste consists of 92 wt% lead oxide, 5 wt% binder (polyvinyl alcohol), and 3 wt% dispersant (polyvinylpyrrolidone), with the apparent density controlled at 4.400 g / cm³ and the coating thickness of 0.35 mm. The negative plate lead paste includes 0.2 wt% lignin, 1.5 wt% barium sulfate, 5 wt% binder (polyvinyl alcohol), and 3 wt% dispersant (polyvinylpyrrolidone), with the apparent density controlled at 4.450 g / cm³ and the coating thickness of 0.25 mm.

[0030] (5) Plate matching and assembly The ratio of the number of positive and negative plates is 6:7. The positive plate is wrapped with an AGM separator (glass fiber separator) containing 7 wt% benzidine-modified polyethylene terephthalate fiber, and after casting and welding in the lower groove, it is assembled into a 2V - 12Ah semi-finished battery.

[0031] The preparation method of the benzidine-modified polyethylene terephthalate fiber: Acylation reaction stage: Place 120 g of polyester fiber in 1150 g of dichloroethane, and use mechanical stirring to ensure uniform dispersion. Then add 15 g of maleic anhydride and 7.5 g of aluminum chloride, and slowly heat up to 40 °C. Keep stirring and reacting at this temperature for 12 hours.

[0032] Further reaction stage: Add 16.5 g of diaminobenzidine, 0.2 g of triethylboron - diethylenetriamine, and 3.5 g of potassium hydroxide to the above reaction system. After initially mixing evenly at room temperature, gradually heat up to 68 °C and maintain this temperature to continue reacting for 7 hours.

[0033] Post-treatment stage: After the reaction is completed, collect the modified fiber by filtration. Wash the fiber with deionized water multiple times until there is no obvious residue of unreacted substances in the washing liquid. Finally, place the fiber in an oven and dry it at an appropriate temperature to obtain the benzidine-modified polyethylene terephthalate fiber.

[0034] (6) Acidification of the semi-finished battery The semi-finished battery is acidified in 36 wt% dilute sulfuric acid, with the temperature controlled at 25 °C and the acidification time of 36 hours.

[0035] Example 2

[0036] Preparation method of high-performance power lead-acid battery (1) Preparation of positive and negative plate grid alloys, with the total amount of positive plate alloy and negative plate alloy calculated as 100 kg each: Positive plate alloy: Tin (Sn): 1.5 kg; Antimony (Sb): 0.1 kg; Bismuth (Bi): 0.02 kg; Selenium (Se): 0.05 kg; The balance is lead (Pb).

[0037] Negative plate alloy: Calcium (Ca): 0.15 kg; Tin (Sn): 0.8 kg; Aluminum (Al): 0.03 kg; The balance is lead (Pb).

[0038] Melting temperature is 650 °C and melting time is 2 hours.

[0039] (2) Strip rolling The thickness of the positive plate lead strip is 0.69 mm, and the thickness of the negative plate lead strip is 0.56 mm. The rolling temperature is 120 °C, the speed is 2.0 m / s, and the pressure is 150 MPa.

[0040] (3) Continuous punching of strip to form grid The positive plate lead strip directly enters the pasting process; the negative plate lead strip is aged in an oven at 95 °C for 8 hours.

[0041] (4) Pasting and curing The positive plate lead paste contains 95 wt% lead oxide, 5 wt% polyvinyl alcohol and polyvinylpyrrolidone, apparent density 4.40 g / cm³, and coating thickness 0.40 mm. The negative plate lead paste includes 0.2 wt% lignin, 1.5 wt% barium sulfate, 5 wt% binder (polyvinyl alcohol) and 3 wt% dispersant (polyvinylpyrrolidone), apparent density 4.450 g / cm³, and coating thickness 0.30 mm.

[0042] (5) Plate matching and assembly The ratio of positive and negative plates is 6:7. The positive plate uses an AGM separator containing 8 wt% benzidine-modified fiber, and after casting and welding in the lower tank, it is assembled into a 2V-12Ah semi-finished battery.

[0043] The preparation method of the benzidine-modified polyethylene terephthalate fiber: Acylation reaction stage: Take 100 g of polyester fiber, disperse it in 1000 g of dichloroethane to ensure that the fiber is fully wetted. Add 10 g of maleic anhydride and 5 g of aluminum chloride, heat up to 35 °C, keep the temperature constant and stir for reaction for 15 hours.

[0044] Further reaction stage: Continuously add 11 g of diaminobenzidine, 0.04 g of triethylboron-diethylenetriamine and 2 g of potassium hydroxide to the reaction system. After stirring and mixing evenly at room temperature, heat up to 65 °C and maintain the reaction for 10 hours.

[0045] Post - treatment stage: The steps of filtration, washing (using deionized water), and drying are the same as those in Example 1.

[0046] (6) Acidification of semi - finished battery 38 wt% dilute sulfuric acid, temperature 20 °C, acidification time 48 hours.

[0047] Example 3

[0048] Preparation method of high - performance power - type lead - acid battery (1) Preparation of positive and negative plate grid alloys. The positive - plate alloy and negative - plate alloy are calculated based on a total amount of 100 kg each: Positive - plate alloy: Tin (Sn): 1.0 kg; Antimony (Sb): 0.08 kg; Bismuth (Bi): 0.005 kg; Selenium (Se): 0.005 kg; The balance is lead (Pb).

[0049] Negative - plate alloy: Calcium (Ca): 0.10 kg; Tin (Sn): 0.10 kg; Aluminum (Al): 0.02 kg; The balance is lead (Pb).

[0050] Melting temperature 800 °C, melting time 1 hour.

[0051] (2) Plate - strip rolling The thickness of the positive - plate lead strip is 0.71 mm, and the thickness of the negative - plate lead strip is 0.54 mm. Rolling temperature 80 °C, speed 0.5 m / s, pressure 50 MPa.

[0052] (3) Continuous punching of plate - strip to form grid The positive - plate directly enters the paste - coating; the negative - plate is aged in an 85 °C oven for 12 hours.

[0053] (4) Paste - coating and curing The positive - plate paste contains 90 wt% lead oxide, 10 wt% polyacrylate and polyvinylpyrrolidone, apparent density 4.40 g / cm³, and coating thickness 0.30 mm. The negative - plate paste includes 0.2 wt% lignin, 1.5 wt% barium sulfate, 5 wt% binder (polyvinyl alcohol), and 3 wt% dispersant (polyvinylpyrrolidone), apparent density 4.450 g / cm³, and coating thickness 0.20 mm.

[0054] (5) Plate - pair matching and assembly The ratio of positive and negative plates is 6:7. The positive - plate uses an AGM separator containing 8 wt% benzidine - modified fiber, and after casting and welding in the lower groove, it is assembled into a 2V - 12Ah semi - finished battery.

[0055] The preparation method of the benzidine - modified polyethylene terephthalate fiber: Acylation reaction stage: 140 g of polyester fiber was placed in 1300 g of dichloroethane solvent. 20 g of maleic anhydride and 10 g of aluminum chloride were added, and the temperature was raised to 45 °C, and the reaction was stirred for 10 hours under these conditions.

[0056] Further reaction stage: 22 g of diaminobenzidine, 0.5 g of triethylboron-diethylenetriamine and 5 g of potassium hydroxide were added to the reaction system. After mixing at room temperature, the temperature was raised to 70 °C and the reaction was continued for 5 hours.

[0057] Post-treatment stage: The operations of filtration, washing and drying followed the method of Example 1.

[0058] (6) Adding acid to the semi-finished battery for formation 34 wt% dilute sulfuric acid, temperature 30 °C, formation time 24 hours.

[0059] Example 4

[0060] Preparation method of high-performance power-type lead-acid battery (1) Preparation of positive and negative plate grid alloys. The positive plate alloy and the negative plate alloy were calculated based on a total amount of 100 kg each: Positive plate alloy: Tin (Sn): 2.0 kg; Antimony (Sb): 0.05 kg; Bismuth (Bi): 0.015 kg; Selenium (Se): 0.02 kg; The balance is lead (Pb).

[0061] Negative plate alloy: Calcium (Ca): 0.13 kg; Tin (Sn): 0.50 kg; Aluminum (Al): 0.025 kg; The balance is lead (Pb).

[0062] Melting temperature 750 °C, melting time 1.5 hours.

[0063] (2) Plate strip rolling The thickness of the positive plate lead strip is 0.70 mm, and the thickness of the negative plate lead strip is 0.55 mm. The rolling temperature is 110 °C, the speed is 1.5 m / s, and the pressure is 120 MPa.

[0064] (3) Punching the plate strip continuously to make the plate grid The positive plate directly enters the coating; the negative plate is aged in an oven at 90 °C for 10 hours.

[0065] (4) Coating and curing The positive plate paste contains 93% lead oxide, 7% polyvinyl alcohol and polyvinylpyrrolidone, with a tap density of 4.40 g / cm³ and a coating thickness of 0.38 mm. The negative plate paste includes 0.2% lignin, 1.5% barium sulfate, 5% binder (polyvinyl alcohol) and 3% dispersant (polyvinylpyrrolidone), with a tap density of 4.450 g / cm³ and a coating thickness of 0.28 mm.

[0066] (5) Plate matching and assembly The positive and negative plates are in a ratio of 6:7. The positive plate uses an AGM separator containing 9 wt% benzidine-modified fibers, and after casting and welding in the lower groove, it is assembled into a 2V - 12Ah semi-finished battery.

[0067] The preparation method of the benzidine-modified polyethylene terephthalate fiber: Acylation reaction stage: 130 g of polyester fiber is evenly dispersed in 1200 g of dichloroethane. 17.5 g of maleic anhydride and 8.75 g of aluminum chloride are added, and the temperature is raised to 42.5 °C, and stirring reaction is maintained for 12.5 hours.

[0068] Further reaction stage: 16 g of diaminobenzidine, 0.3 g of triethylboron - diethylenetriamine and 4 g of potassium hydroxide are added to the system. Mix evenly at room temperature, then raise the temperature to 67.5 °C and continue the reaction for 7.5 hours.

[0069] Post-treatment stage: Filter and collect the fibers, wash them thoroughly with deionized water to remove all unreacted substances. Dry them to obtain benzidine-modified polyethylene terephthalate fibers.

[0070] (6) Acidification of semi-finished battery 37 wt% dilute sulfuric acid, temperature 28 °C, acidification time 36 hours.

[0071] Comparative Example 1 The difference between this example and Example 1 is that in the plate matching and assembly of this example, polyester fiber is used to equivalently replace the benzidine-modified polyethylene terephthalate fiber.

[0072] Comparative Example 2 The difference between this example and Example 1 is that in the preparation process of the benzidine-modified polyethylene terephthalate fiber in this example, diaminobenzidine is not added.

[0073] Comparative Example 3 The difference between this example and Example 1 is that in the preparation process of the benzidine-modified polyethylene terephthalate fiber in this example, triethylboron - diethylenetriamine is not added.

[0074] Test Example 1 The following tests are carried out on the lead-acid batteries prepared in Examples 1 - 4 and Comparative Examples 1 - 3: 1. High-rate Discharge Test Test Equipment: Digital battery test system, with constant current discharge function and real-time data acquisition.

[0075] Test Conditions: Temperature is controlled at 25 ± 2 °C; the test rates are set to 0.2C (low rate) and 0.5C (higher rate).

[0076] Test Steps: Charge the battery to 100% state.

[0077] Under the environment of 25 °C, first discharge at a rate of 0.2C to the cut-off voltage of 1.80 V, and then record the discharge capacity.

[0078] After recharging to 100% state of charge, conduct a discharge test at a rate of 0.5C, and record each voltage during the discharge process and the discharge capacity of the battery when the discharge is cut off until the cut-off voltage of 1.75 V.

[0079] Calculate the capacity retention rate of the battery under the 0.5C discharge condition (the ratio to the test result under the 0.2C condition).

[0080] 2. Cycle Life Test Test Equipment: Cycle life tester, which automatically records the data during the charge and discharge process.

[0081] Test Conditions: Temperature is controlled at 25 ± 2 °C; adopt the standard charge and discharge protocol.

[0082] Test Steps: After charging the battery to 100%, conduct charge and discharge cycles: (1) Circuit discharge: Discharge at 6 A until the voltage reaches 1.75 V; (2) Constant voltage and current-limiting charging: Control the charging voltage at 2.47 V, the charging current at 6 A, and the charging time at 4 h; (3) Stand still for 30 min; Record the discharge capacity once per cycle, and the cumulative number of cycles reaches 500 times; Analyze the remaining percentage of the battery capacity after the cycle, and calculate the capacity attenuation rate.

[0083] 3. Vibration Resistance Test Test Equipment: Vibration table, with sine vibration and random vibration functions; dynamic monitoring data acquisition system.

[0084] Test Conditions: Test frequency: 10 - 200 Hz sine vibration; acceleration: 5 - 10g; during random vibration test, the total acceleration range is 5 - 8g, and the duration is 30 minutes.

[0085] Test Steps: Install the battery on a vibration table and conduct a sine vibration test according to the specified vibration parameters; Check the appearance, structure of the battery and whether there is any leakage of the electrolyte after vibration; After conducting a random vibration test, repeat the inspection and record any abnormal phenomena; At the same time, conduct the same test on the comparative samples to observe whether there is any loosening of the electrode plates or damage to the internal components.

[0086] After the vibration test, test the open-circuit voltage and 0.5C discharge capacity of the battery.

[0087] Table 1 Test Results

[0088] The test results are shown in Table 1, which proves the significant improvement of the preparation method of the present invention in key performances such as high-rate discharge, long cycle life and excellent vibration resistance performance, providing strong technical support for the efficient and stable application of power-type lead-acid batteries.

Claims

1. A method for preparing benzidine-modified polyethylene terephthalate fiber, characterized in that: The method comprises the following steps, wherein the parts are by mass: (1) placing 100-140 parts of polyester fiber in 1000-1300 parts of ethylene dichloride, stirring evenly, adding 10-20 parts of maleic anhydride and 5-10 parts of aluminum chloride to carry out acylation reaction; (2) Add 11-22 parts of diaminobenzidine, 0.04-0.5 parts of triethylborane-diethylenetriamine, and 2-5 parts of potassium hydroxide to the above reaction system, mix well, and react; (3) After the reaction is completed, the fibers obtained by the reaction are separated by filtration, the unreacted substances are removed by washing, and the fibers are dried to obtain benzidine-modified polyethylene terephthalate fibers.

2. The method for preparing the benzidine-modified polyethylene terephthalate fiber according to claim 1, characterized in that: In step (1), the reaction temperature is 35-45°C and the reaction time is 10-15 hours.

3. The method for preparing the benzidine-modified polyethylene terephthalate fiber according to claim 1, characterized in that: In step (2), the reaction temperature is 65-70°C and the reaction time is 5-10 hours.

4. Benzidine-modified polyethylene terephthalate fiber prepared by the preparation method according to any one of claims 1 to 3.

5. A separator for a lead-acid battery, characterized in that: The components include glass fiber and the benzidine-modified polyethylene terephthalate fiber as described in claim 4, wherein the added mass percentage of the benzidine-modified polyethylene terephthalate fiber is 7%-9%.

6. A high-performance power lead-acid battery, comprising a pole group, the pole group comprising a positive plate, a negative plate and a separator, characterized in that: The separator is the separator for the lead acid battery according to claim 5.

7. The high performance power type lead-acid battery according to claim 6, characterized in that: The positive electrode plate includes a positive electrode grid and a positive electrode lead paste, and the negative electrode plate includes a negative electrode grid and a negative electrode lead paste. The formula of the positive electrode grid includes, by weight: 0.50-2.0 parts of tin, 0.05-0.10 parts of antimony, 0.005-0.02 parts of bismuth, 0.005-0.05 parts of selenium, and the balance is lead; Calculated by weight, the formula of the negative electrode grid includes: 0.10-0.15 parts of calcium, 0.10-0.80 parts of tin, 0.02-0.03 parts of aluminum, and the balance is lead.

8. The high-performance power type lead-acid battery according to claim 7, characterized in that: The positive grid and the negative grid are both prepared by continuous rolling and continuous punching, wherein the thickness of the lead strip rolled for the positive grid is 0.70±0.01 mm; the thickness of the lead strip rolled for the negative grid is 0.55±0.01 mm; during the rolling process of the positive grid and the negative grid, the temperature is controlled at 80-120°C, the rolling speed is controlled at 0.5-2.0 m / s, and the rolling pressure is controlled at 50-150MPa.

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