Separator for lead-acid battery and high-performance power lead-acid battery

Abstract

The present invention provides a separator for a lead-acid battery and a high-performance power lead-acid battery. Benzidine-modified polyethylene terephthalate fiber is used to produce a lead-acid battery separator, thereby enhancing the chemical stability and mechanical properties of the fiber and improving the overall stability and reliability of the battery. The special structure and modified components of the fiber optimize the internal ion transmission path of the lead-acid battery, change the charge distribution and pore structure on the fiber surface, and make the migration of sulfate ions and the like smoother, thereby improving the charging and discharging efficiency, reducing energy loss, and enhancing the battery power performance, especially during high-current charging and discharging. The fiber material may have flame retardancy and thermal stability, and when the battery is overcharged, over-discharged, or other abnormalities causing the internal temperature to rise, the fiber material can prevent heat from diffusing and spreading, thereby reducing the risk of thermal runaway.

Description

Technical Field

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

[0002] Lead-acid batteries are still widely used in the field of power batteries due to their mature technical system, low cost, high reliability and easy recycling.

[0003] However, traditional lead-acid battery technology has certain limitations in high-rate discharge, deep cycle, and vibration resistance, which are mainly reflected in the following aspects:

[0004] 1) Insufficient high-rate discharge capability

[0005] Existing lead-acid batteries suffer from low utilization of active material within the plates during high-rate discharge, resulting in high internal resistance and a significant drop in output voltage. This makes them unable to meet the demands of vehicle starting or short-term high-power output. Battery performance degrades even more rapidly under extreme temperatures and frequent start-stop conditions.

[0006] 2) Limited cycle life

[0007] Over long periods of cycling, traditional lead-acid batteries experience a gradual decline in capacity and shortened service life due to the accumulation of plate sulfation. Deep discharge and high-rate operation are particularly problematic, leading to issues such as plate active material stripping, grid corrosion, and lead dendrite growth, which directly impact battery durability and safety.

[0008] 3) Vibration resistance and structural stability issues

[0009] In automotive and other power applications, batteries often need to withstand significant vibration and shock. Traditional plate production and assembly processes have limitations, which can easily lead to safety hazards such as loose internal structures, electrolyte leakage, or local short circuits. Therefore, improving the vibration resistance and overall structural stability of lead-acid batteries has become a critical technical issue that needs to be addressed.

[0010] 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 conducted at home and abroad to improve battery performance by modifying the separator.

[0011] For example, patent application CN1398008A discloses a method for modifying ultrafine glass fiber separators for lead-acid batteries. The method uses a hydrophobic organic polymer, polytetrafluoroethylene (PTFE), in the ultrafine glass fiber separator to provide hydrophobicity. This treatment provides a dedicated transverse channel for gas, improving the separator's permeability. This effectively increases the gas recombination efficiency of VRLA batteries, reduces internal battery pressure, minimizes valve opening frequency, prevents battery dry-out, and extends battery life at a low cost.

[0012] For example, patent application CN114497885A discloses a process for producing ultrafine glass fiber battery separators: S001, preparation of a phenolic resin adhesive; S002, preparation of an ultrafine glass fiber felt; S003, preparation of a battery separator. This application modifies a phenolic resin adhesive using phenol, formaldehyde, and graphene oxide as raw materials to produce a modified phenolic resin adhesive. This phenolic resin adhesive is then sprayed onto secondary ultrafine glass fiber filaments, effectively improving the strength, tensile properties, and high-temperature resistance of the battery separator. The ultrafine glass fiber felt is then homogenized multiple times to improve the uniformity of the battery separator, thereby extending the service life of lead-acid batteries.

[0013] However, there is still room for improvement in the high-rate discharge capability, cycle life, vibration resistance and structural stability of lead-acid batteries, and finding new battery separator modification methods is still of great significance. Summary of the Invention

[0014] In order to solve the above technical problems existing in the prior art, the present invention provides a separator for a lead-acid battery and a high-performance power-type lead-acid battery.

[0015] The present invention first provides a method for preparing benzidine-modified polyethylene terephthalate fiber, comprising the following steps, wherein the parts are by mass:

[0016] (1) Place 100-140 parts of polyester fiber in 1000-1300 parts of ethylene dichloride, stir evenly, then add 10-20 parts of maleic anhydride and 5-10 parts of aluminum chloride to carry out acylation reaction;

[0017] (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;

[0018] (3) After the reaction is completed, the fibers obtained by the reaction are separated by filtration, unreacted substances are removed by washing, and the fibers are dried to obtain benzidine-modified polyethylene terephthalate fibers.

[0019] Preferably, in step (1), the reaction temperature is 35-45°C and the reaction time is 10-15 hours.

[0020] Preferably, in step (2), the reaction temperature is 65-70°C and the reaction time is 5-10 hours.

[0021] The present invention provides benzidine-modified polyethylene terephthalate fiber prepared by the above preparation method.

[0022] The present invention also provides a separator for a lead-acid battery, comprising glass fiber and the above-mentioned benzidine-modified polyethylene terephthalate fiber, wherein the added mass percentage of the benzidine-modified polyethylene terephthalate fiber is 7%-9%.

[0023] Preferably, the added mass percentage of the benzidine-modified polyethylene terephthalate fiber is 9%.

[0024] The present invention also provides a high-performance power lead-acid battery, comprising a pole group, wherein the pole group comprises a positive plate, a negative plate and a separator for the lead-acid battery.

[0025] Preferably, the positive plate includes a positive electrode grid and a positive electrode lead paste, and the negative plate includes a negative electrode grid and a negative electrode lead paste. The formula of the positive electrode grid includes, by mass: 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; the formula of the negative electrode grid includes, by mass: 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.

[0026] Preferably, the positive electrode grid and the negative electrode grid are both prepared by a continuous rolling and continuous punching method, wherein the thickness of the lead strip rolled for the positive electrode grid is 0.70±0.01 mm; the thickness of the lead strip rolled for the negative electrode grid is 0.55±0.01 mm; during the rolling process of the positive electrode grid and the negative electrode grid, the temperature is controlled at 80-120°C, the rolling speed is controlled at 0.5-2.0m / s, and the rolling pressure is controlled at 50-150MPa.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1) Improve battery performance and stability

[0029] Benzidine-modified polyethylene terephthalate fiber, used in lead-acid battery separators, enhances the fiber's chemical stability and mechanical properties. This improved chemical stability allows for better resistance to corrosion from sulfuric acid electrolytes, extending separator life and improving overall battery stability and reliability. Its superior mechanical properties ensure the integrity of the separator structure, preventing short circuits between the positive and negative electrodes and ensuring safe battery operation.

[0030] 2) Optimize battery performance

[0031] The fiber's unique structure and modified ingredients optimize the ion transport pathways within lead-acid batteries, altering the charge distribution and pore structure on the fiber surface. This allows for smoother migration of sulfate ions and other substances, improving charge and discharge efficiency, reducing energy loss, and boosting battery power performance, particularly during high-current charge and discharge cycles. Furthermore, during the battery's charge and discharge cycles, it inhibits the shedding of active electrode materials and the growth of lead sulfate crystals, maintaining electrode activity and stability, extending cycle life, and reducing capacity decay.

[0032] 3) Enhance battery safety and consistency

[0033] The fiber material may possess flame retardancy and thermal stability. This can prevent heat from spreading when the battery experiences internal temperature increases due to overcharging or over-discharging, reducing the risk of thermal runaway and potentially fires. Furthermore, using this fiber to make components such as separators can improve the consistency of lead-acid battery production, ensuring more consistent performance across batches, facilitating the combined use of battery packs and enhancing overall performance and lifespan. DETAILED DESCRIPTION

[0034] Example 1

[0035] Preparation method of high-performance power lead-acid battery

[0036] (1) Preparation of positive and negative grid alloys

[0037] Under vacuum melting conditions, the positive plate alloy and the negative plate alloy were melted according to the following mass ratios, with the total amount of the positive plate alloy and the negative plate alloy being 100 kg respectively:

[0038] Positive plate alloy:

[0039] Tin (Sn): 0.50 kg; Antimony (Sb): 0.06 kg; Bismuth (Bi): 0.01 kg; Selenium (Se): 0.01 kg; the remainder is lead (Pb).

[0040] Negative plate alloy:

[0041] Calcium (Ca): 0.12 kg; Tin (Sn): 0.60 kg; Aluminum (Al): 0.025 kg; the remainder is lead (Pb).

[0042] The melting temperature was controlled at 700°C and the melting time was 1.5 hours.

[0043] (2) Strip rolling

[0044] The positive lead strip is rolled from a calcium-free alloy, with a thickness of 0.70 mm. The negative lead strip is rolled from a high-calcium, low-tin alloy, with a thickness of 0.55 mm. The rolling process is performed at a temperature of 100°C, a rolling speed of 1.0 m / s, and a rolling pressure of 100 MPa.

[0045] (3) Grids made by continuous punching of plates and strips

[0046] After the positive lead strip is punched, it directly enters the coating process; after the negative lead strip is punched, it is placed in a 90°C oven for aging treatment for 10 hours.

[0047] (4) Coating curing

[0048] The positive lead paste consists of 92wt% lead oxide, 5wt% binder (polyvinyl alcohol), and 3wt% dispersant (polyvinyl pyrrolidone), with an apparent density of 4.400 g / cm³ and a coating thickness of 0.35 mm. The negative lead paste consists of 0.2wt% lignin, 1.5wt% barium sulfate, 5wt% binder (polyvinyl alcohol), and 3wt% dispersant (polyvinyl pyrrolidone), with an apparent density of 4.450 g / cm³ and a coating thickness of 0.25 mm.

[0049] (5) Plate assembly and assembly

[0050] 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 7wt% benzidine-modified polyethylene terephthalate fiber. After cast welding in the lower tank, it is assembled into a 2V-12Ah semi-finished battery.

[0051] Preparation method of the benzidine-modified polyethylene terephthalate fiber:

[0052] Acylation reaction: 120 g of polyester fiber was placed in 1150 g of ethylene dichloride and mechanically stirred to ensure uniform dispersion. 15 g of maleic anhydride and 7.5 g of aluminum chloride were then added. The temperature was slowly raised to 40°C and stirred for 12 hours.

[0053] Further reaction stage: Add 16.5 g of diaminobenzidine, 0.2 g of triethylborane-diethylenetriamine, and 3.5 g of potassium hydroxide to the above reaction system. After preliminary mixing at room temperature, gradually increase the temperature to 68°C and maintain this temperature for 7 hours.

[0054] Post-processing: After the reaction is complete, the modified fiber is collected by filtration. The fiber is washed multiple times with deionized water until no unreacted material remains. Finally, the fiber is dried in an oven at an appropriate temperature to obtain benzidine-modified polyethylene terephthalate fiber.

[0055] (6) Acidification of semi-finished battery

[0056] The semi-finished battery was acidified in 36wt% dilute sulfuric acid, the temperature was controlled at 25°C, and the formation time was 36 hours.

[0057] Example 2

[0058] Preparation method of high-performance power lead-acid battery

[0059] (1) Preparation of positive and negative grid alloys: The total amount of positive plate alloy and negative plate alloy is 100 kg respectively:

[0060] Positive plate alloy:

[0061] Tin (Sn): 1.5 kg; Antimony (Sb): 0.1 kg; Bismuth (Bi): 0.02 kg; Selenium (Se): 0.05 kg; the remainder is lead (Pb).

[0062] Negative plate alloy:

[0063] Calcium (Ca): 0.15 kg; Tin (Sn): 0.8 kg; Aluminum (Al): 0.03 kg; the remainder is lead (Pb).

[0064] The melting temperature is 650°C and the melting time is 2 hours.

[0065] (2) Strip rolling

[0066] The thickness of the positive lead strip is 0.69 mm, and the thickness of the negative 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.

[0067] (3) Grids made by continuous punching of plates and strips

[0068] The positive lead strip enters the coating process directly; the negative lead strip is aged in a 95°C oven for 8 hours.

[0069] (4) Coating curing

[0070] The positive lead paste contains 95wt% lead oxide, 5wt% polyvinyl alcohol, and polyvinyl pyrrolidone, with an apparent density of 4.40 g / cm³ and a coating thickness of 0.40 mm. The negative lead paste includes 0.2wt% lignin, 1.5wt% barium sulfate, 5wt% binder (polyvinyl alcohol), and 3wt% dispersant (polyvinyl pyrrolidone), with an apparent density of 4.450 g / cm³ and a coating thickness of 0.30 mm.

[0071] (5) Plate assembly and assembly

[0072] The positive and negative plates have a 6:7 ratio, and the positive plate uses an AGM separator containing 8wt% benzidine modified fiber. The lower tank is cast and welded before assembly into a 2V-12Ah semi-finished battery.

[0073] Preparation method of the benzidine-modified polyethylene terephthalate fiber:

[0074] Acylation reaction: Disperse 100 g of polyester fiber in 1000 g of ethylene dichloride, ensuring full fiber saturation. Add 10 g of maleic anhydride and 5 g of aluminum chloride. Heat to 35°C and maintain constant temperature with stirring for 15 hours.

[0075] Further reaction stage: 11 g of diaminobenzidine, 0.04 g of triethylborane-diethylenetriamine, and 2 g of potassium hydroxide were added to the reaction system. After stirring and mixing at room temperature, the temperature was raised to 65°C and the reaction was maintained for 10 hours.

[0076] Post-processing stage: filtration, washing (using deionized water), and drying steps are the same as in Example 1.

[0077] (6) Acidification of semi-finished battery

[0078] 38wt% dilute sulfuric acid, temperature 20 ℃, formation time 48 hours.

[0079] Example 3

[0080] Preparation method of high-performance power lead-acid battery

[0081] (1) Preparation of positive and negative grid alloys: The total amount of positive plate alloy and negative plate alloy is 100 kg respectively:

[0082] Positive plate alloy:

[0083] Tin (Sn): 1.0 kg; Antimony (Sb): 0.08 kg; Bismuth (Bi): 0.005 kg; Selenium (Se): 0.005 kg; the remainder is lead (Pb).

[0084] Negative plate alloy:

[0085] Calcium (Ca): 0.10 kg; Tin (Sn): 0.10 kg; Aluminum (Al): 0.02 kg; the remainder is lead (Pb).

[0086] The melting temperature is 800°C and the melting time is 1 hour.

[0087] (2) Strip rolling

[0088] The thickness of the positive lead strip is 0.71 mm, and the thickness of the negative lead strip is 0.54 mm. The rolling temperature is 80°C, the speed is 0.5 m / s, and the pressure is 50 MPa.

[0089] (3) Grids made by continuous punching of plates and strips

[0090] The positive plate goes directly into the coating process; the negative plate is aged in an 85°C oven for 12 hours.

[0091] (4) Coating curing

[0092] The positive lead paste contains 90wt% lead oxide, 10wt% polyacrylate, and polyvinyl pyrrolidone, with an apparent density of 4.40 g / cm³ and a coating thickness of 0.30 mm. The negative lead paste includes 0.2wt% lignin, 1.5wt% barium sulfate, 5wt% binder (polyvinyl alcohol), and 3wt% dispersant (polyvinyl pyrrolidone), with an apparent density of 4.450 g / cm³ and a coating thickness of 0.20 mm.

[0093] (5) Plate assembly and assembly

[0094] The positive and negative plates have a 6:7 ratio, and the positive plate uses an AGM separator containing 8wt% benzidine modified fiber. The lower tank is cast and welded before assembly into a 2V-12Ah semi-finished battery.

[0095] Preparation method of the benzidine-modified polyethylene terephthalate fiber:

[0096] Acylation reaction: 140 g of polyester fiber was placed in 1300 g of ethylene dichloride solvent. 20 g of maleic anhydride and 10 g of aluminum chloride were added. The temperature was raised to 45°C and the mixture was stirred for 10 hours.

[0097] Further reaction stage: 22 g of diaminobenzidine, 0.5 g of triethylborane-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.

[0098] Post-processing stage: Filtration, washing and drying operations follow the method of Example 1.

[0099] (6) Acidification of semi-finished battery

[0100] 34wt% dilute sulfuric acid, temperature 30 ℃, formation time 24 hours.

[0101] Example 4

[0102] Preparation method of high-performance power lead-acid battery

[0103] (1) Preparation of positive and negative grid alloys: The total amount of positive plate alloy and negative plate alloy is 100 kg respectively:

[0104] Positive plate alloy:

[0105] Tin (Sn): 2.0 kg; Antimony (Sb): 0.05 kg; Bismuth (Bi): 0.015 kg; Selenium (Se): 0.02 kg; the remainder is lead (Pb).

[0106] Negative plate alloy:

[0107] Calcium (Ca): 0.13 kg; Tin (Sn): 0.50 kg; Aluminum (Al): 0.025 kg; the remainder is lead (Pb).

[0108] The melting temperature is 750°C and the melting time is 1.5 hours.

[0109] (2) Strip rolling

[0110] The thickness of the positive lead strip is 0.70 mm, and the thickness of the negative 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.

[0111] (3) Grids made by continuous punching of plates and strips

[0112] The positive plate goes directly into the coating process; the negative plate is aged in a 90°C oven for 10 hours.

[0113] (4) Coating curing

[0114] The positive lead paste contains 93% lead oxide, 7% polyvinyl alcohol, and polyvinyl pyrrolidone, with an apparent density of 4.40 g / cm³ and a coating thickness of 0.38 mm. The negative lead paste includes 0.2% lignin, 1.5% barium sulfate, 5% binder (polyvinyl alcohol), and 3% dispersant (polyvinyl pyrrolidone), with an apparent density of 4.450 g / cm³ and a coating thickness of 0.28 mm.

[0115] (5) Plate assembly and assembly

[0116] The positive and negative plates have a 6:7 ratio, and the positive plate uses an AGM separator containing 9wt% benzidine modified fiber. The lower tank is cast and welded before assembly into a 2V-12Ah semi-finished battery.

[0117] Preparation method of the benzidine-modified polyethylene terephthalate fiber:

[0118] Acylation reaction: Disperse 130 g of polyester fiber evenly in 1200 g of ethylene dichloride. Add 17.5 g of maleic anhydride and 8.75 g of aluminum chloride. Heat to 42.5°C and stir for 12.5 hours.

[0119] Further reaction stage: 16 g of diaminobenzidine, 0.3 g of triethylborane-diethylenetriamine, and 4 g of potassium hydroxide were added to the system. Mixed at room temperature, the mixture was then heated to 67.5°C and the reaction continued for 7.5 hours.

[0120] Post-processing: The fibers are collected by filtration, washed thoroughly with deionized water to remove all unreacted substances, and dried to obtain benzidine-modified polyethylene terephthalate fibers.

[0121] (6) Acidification of semi-finished battery

[0122] 37wt% dilute sulfuric acid, temperature 28 ℃, formation time 36 hours.

[0123] Comparative Example 1

[0124] The difference between this example and Example 1 is that in this example, polyester fiber is used in equal amounts to replace the benzidine-modified polyethylene terephthalate fiber during the plate assembly and assembly.

[0125] Comparative Example 2

[0126] The difference between this example and Example 1 is that diaminobenzidine is not added during the preparation of the benzidine-modified polyethylene terephthalate fiber in this example.

[0127] Comparative Example 3

[0128] The difference between this example and Example 1 is that triethylboron-diethylenetriamine is not added during the preparation of the benzidine-modified polyethylene terephthalate fiber in this example.

[0129] Test Example 1

[0130] The lead-acid batteries prepared in Examples 1-4 and Comparative Examples 1-3 were subjected to the following tests:

[0131] 1. High rate discharge test

[0132] Test equipment: Digital battery test system with constant current discharge function and real-time data acquisition.

[0133] Test conditions: The temperature was controlled at 25±2°C; the test magnification was set to 0.2°C (low magnification) and 0.5°C (higher magnification).

[0134] Test steps:

[0135] Charge the battery to 100%.

[0136] At 25°C, the battery was first discharged at a rate of 0.2C to a termination voltage of 1.80 V, and then the discharge capacity was recorded.

[0137] After charging to 100% state of charge, a discharge test was performed at a rate of 0.5C until the end voltage of 1.75 V was reached. The voltages at each stage of the discharge process and the battery discharge capacity at the end of the discharge were recorded.

[0138] Calculate the capacity retention rate of the battery under 0.5C discharge conditions (the ratio of the test results under 0.2C conditions).

[0139] 2. Cycle life test

[0140] Test equipment: Cycle life tester, automatically records charge and discharge process data.

[0141] Test conditions:

[0142] The temperature was controlled at 25±2°C; standard charge and discharge protocols were used.

[0143] Test steps:

[0144] After charging the battery to 100%, perform a charge and discharge cycle:

[0145] (1) Circuit discharge: 6 A discharge to a voltage of 1.75 V;

[0146] (2) Constant voltage and current limiting charging: control the charging voltage to 2.47 V, the charging current to 6 A, and the charging time to 4 h;

[0147] (3) Let it stand for 30 minutes;

[0148] The discharge capacity is recorded every cycle, and the cumulative number of cycles reaches 500;

[0149] Analyze the remaining percentage of battery capacity after the cycle is completed and calculate the capacity decay rate.

[0150] 3. Vibration resistance test

[0151] Test equipment: vibration table with sinusoidal and random vibration functions; dynamic monitoring data acquisition system.

[0152] Test conditions: Test frequency: 10-200 Hz sinusoidal vibration; acceleration: 5-10g; random vibration test, total acceleration range 5-8g, duration 30 minutes.

[0153] Test steps:

[0154] Install the battery on a vibration table and perform a sinusoidal vibration test according to the specified vibration parameters;

[0155] Check the battery appearance, structure and electrolyte leakage after vibration;

[0156] After performing the random vibration test, repeat the inspection and record any abnormalities;

[0157] At the same time, perform the same test on the comparison samples to observe whether the plates are loose or the internal components are damaged.

[0158] After the vibration test, the battery opening voltage and 0.5C discharge capacity are tested.

[0159] Table 1 Test results

[0160]

[0161] The test results are shown in Table 1, which prove that the preparation method of the present invention has significant improvements in key performances such as high-rate discharge, long cycle life and excellent vibration resistance, 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) Place 100-140 parts of polyester fiber in 1000-1300 parts of ethylene dichloride, stir evenly, then add 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, 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, wherein: 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, wherein: 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 composition includes glass fiber and the benzidine-modified polyethylene terephthalate fiber according to 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, wherein the pole group comprises 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 lead-acid battery according to claim 6, characterized in that: The positive plate includes a positive electrode grid and a positive electrode lead paste, and the negative plate includes a negative electrode grid and a negative electrode lead paste. The positive electrode grid comprises, 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 being lead; Calculated by mass, 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 lead-acid battery according to claim 7, characterized in that: The positive and negative electrode grids are both prepared by a continuous rolling and punching method, wherein the thickness of the lead strip rolled for the positive electrode grid is 0.70±0.01 mm; the thickness of the lead strip rolled for the negative electrode grid is 0.55±0.01 mm; during the rolling process of the positive and negative electrode grids, 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.

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