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  • 48 volt electric bicycle range test data

    2025-05-29

    1、 Core Data: Laboratory vs Real SceneStandard test dataLaboratory conditions (25 ℃ constant temperature, 50kg load, 15km/h constant speed):48V12Ah battery: theoretical range of about 36-48 kilometers.48V20Ah battery: theoretical range of about 60-80 kilometers (some brands claim up to 80 kilometers).Actual road condit...

  • Remaining capacity detection of electric vehicle batteries: methods, tools, and precautions

    2025-05-28

    1、 Four core detection methods1. Discharge testing method (most accurate)Principle: Discharge the battery to the termination voltage with a constant current, using the formula; Capacity (Ah)=Discharge current (A) Discharge time (h) Calculate the actual capacity.Tool: Professional discharge tester (such as Songke pilo...

  • 292025-05

    48 volt electric bicycle range test data

    1、 Core Data: Laboratory vs Real SceneStandard test dataLaboratory conditions (25 ℃ constant temperature, 50kg load, 15km/h constant speed):48V12Ah battery: theoretical range of about 36-48 kilometers.48V20Ah battery: theoretical range of about 60-80 kilometers (some brands claim up to 80 kilometers).Actual road condition test:The 48V20Ah battery has a range of about 55-60 kilometers in summer and drops to 30-35 kilometers in winter (5 ℃).Typical case: Yadi 48V20Ah model, tested at 25 ℃ for 58 kilometers, reduced to 32 kilometers in winter (minus 3 ℃).User test casesViolent cycling test: After upgrading the Super Micro Black Gold Graphene battery (23Ah), a user maintained a daily load capacity and frequent rapid acceleration, and still maintained a range of 70 kilometers in spring and summer seasons.Takeout scenario: The 72V38Ah battery can carry 90 kilograms in summer and run for 138 kilometers, while in winter, it can la

  • 282025-05

    Remaining capacity detection of electric vehicle batteries: methods, tools, and precautions

    1、 Four core detection methods 1. Discharge testing method (most accurate) Principle: Discharge the battery to the termination voltage with a constant current, using the formula; Capacity (Ah)=Discharge current (A) Discharge time (h) Calculate the actual capacity. Tool: Professional discharge tester (such as Songke pilot battery module testing cabinet). Operation: Connect the load resistor and set the discharge current (recommended 0.5C, i.e. 2-hour discharge rate). Record the time when the voltage drops to the termination value (such as 10.5V for lead-acid batteries). Advantages: Accurate results that can intuitively reflect the degree of battery degradation. Limitations: It takes a long time (2-10 hours) and requires professional equipment. 2.

  • 272025-05

    Common faults and solutions of electric bicycles

    1、 Battery system malfunction1. The battery cannot be charged or is not fully chargedPhenomenon: The charger has no response and the battery level does not increase for a long time.reason:Battery aging (end of life).The internal fuse of the battery is blown or has poor contact.Charger malfunction (no output voltage or abnormal indicator light).solve:Replace the aging battery, check and replace the fuse.Adjust the contact between the battery and the safety seat to ensure stability.Replace or repair the charger and avoid using non original equipment.2. Significant decrease in battery lifePhenomenon: The driving range is significantly reduced when fully charged.reason:Single battery damage (such as inconsistent voltage).Low temperature environment leads to a decrease in the efficiency of active substances.solve:Use professional equipment to test the battery pack and replace faulty units.Avoid charging below 0 ℃ and store at 5

  • 262025-05

    The impact of fast and slow charging on battery life

    1、 Core conclusion: Fast charging has a more significant impact on battery lifeData support:Laboratory cycling tests have shown that under the same number of cycles, the capacity decay of fast charging batteries is 15% -30% faster than that of slow charging.Tesla Model 3 actual test: After using Super Fast Charge (250kW) 500 times, the battery health (SOH) decreased to 87%, while the SOH remained at 92% after using Home Slow Charge (7kW) 500 times.2、 Three major mechanisms of fast charging acceleration and decayLithium dendrite growthPrinciple: During fast charging, lithium ions quickly embed into the negative electrode, and some lithium ions do not enter the layered structure, depositing on the surface to form dendrites.Consequence: Dendrite piercing through the diaphragm leads to internal short circuit and accelerated capacity decay.Case: Due to frequent fast charging, the battery capacity of a certain brand of electric

  • 242025-05

    Complete Guide to Electric Vehicle Battery Maintenance: 20 Golden Rules for Scientifically Extending Life

    1、 Optimization of charging habitsShallow charging and discharging, refuse overloadBattery window: Maintain 20% -80% battery level for daily use, avoiding battery levels below 10% or fully charged to 100%.Data support: Deep charging and discharging (0-100%) of lithium batteries results in a lifespan decay of approximately 0.1%, while shallow charging and discharging only cause a decay of 0.05%.The original charger is irreplaceableRisk warning: Non original chargers may cause overcharging (voltage fluctuation 5%), unstable current, and battery swelling.Case: A certain brand of electric vehicle experienced a 60% decrease in battery capacity within 3 months due to the use of third-party fast charging.Regular deep charging and dischargingCalibration cycle: Perform 0-100% charging and discharging every 3 months to correct BMS power calculation errors.Operation points: Start charging when discharging to 15% to avoid complete de

  • 232025-05

    Guidelines for selecting electric vehicle battery cells

    What type of battery cell is good for electric vehicles?There are three main types of electric vehicle battery cells: lithium-ion batteries, nickel hydrogen batteries, and solid-state batteries. Among them, lithium-ion batteries have become mainstream due to their advantages such as high energy density and long cycle life, and are further subdivided into lithium iron phosphate (LFP), ternary materials (NCM/NCA), lithium manganese oxide (LMO), and lithium titanate (LTO). Lithium iron phosphate batteries are known for their safety and cost advantages, making them suitable for users who value cost-effectiveness; Ternary material battery cells have higher energy density and are suitable for users who pursue long battery life, but the cost is also relatively high. In addition, the shape of the battery cell is also a factor to consider when choosing. Cylindrical battery cells have mature technology and good heat dissipation, but

  • 222025-05

    EU imposes voltage and capacity restrictions on electric bicycle batteries

    1、 EU Core Regulation: 48V Voltage Cap and Capacity Durability RequirementsVoltage Classification Standard (EN 50604-1)Class A: DC voltage 60V (covering the vast majority of electric bicycle batteries).Class B:60V< DC voltage 1500V (applicable to high-performance electric motorcycles or special vehicles).Mandatory requirement: The EU standard for electric assisted bicycles (EPAC/EN 15194) specifies that the battery voltage must not exceed 48VDC, and the power must gradually decrease until power is cut off when the speed reaches 25km/h.Capacity and performance requirementsLight duty vehicle batteries (LMT): They must meet the capacity durability testing requirements of the EU's new battery law (EU 2023/1542) to ensure stable battery life throughout their lifespan.Test items: including vibration impact, thermal cycling, overcharge protection, etc., simulating extreme usage scenarios.2、 Differentiated regulations amo

  • 212025-05

    Comparison of Range between 36V20AH and 48V20AH Electric Bicycle Batteries

    1、 Theoretical endurance calculationThe core indicator of range is the energy stored in the battery (watt hours, Wh), calculated as follows:Energy (Wh)=Voltage (V) Capacity (Ah)36V20Ah battery: 36V 20Ah= 720Wh48V20Ah battery: 48V 20Ah= 960WhTheoretical endurance difference:48V battery has higher energy than 36V battery; 33.3%, under identical usage conditions (such as motor efficiency, vehicle weight, road conditions, etc.), the 48V20Ah battery has a longer range, with a theoretical difference of about 33%.2、 Factors affecting actual battery lifeThe actual battery life is affected by multiple variables, and the advantages of 48V batteries may be further amplified or reduced:Motor Efficiency48V system: usually matched with higher power motors (such as 500W-1000W), with higher efficiency during high-speed cruising (about 85% -90%).36V system: The motor power is relatively low (such as 250W-350W), and the efficiency is s

  • 202025-05

    Structure and composition of electric bicycle power battery

    1、 Battery type and chemical compositionElectric bicycle power batteries are mainly divided into three categories, each with its own chemical characteristics and application scenarios:Lead acid batteryElectrode material: Lead and its oxides as positive and negative electrodes, sulfuric acid solution as electrolyte.Features: Low cost, mature technology, but low energy density (short battery life), heavy weight, gradually replaced by lithium batteries.Lithium ion battery (mainstream choice)Positive electrode material:Lithium iron phosphate (LiFePO ₄): High safety, ignition point up to 800 ℃, long cycle life, low cost (0.6 yuan/Wh).Ternary materials (such as lithium nickel cobalt manganese oxide): high energy density, longer range, but higher cost (0.8 yuan/Wh).Negative electrode material: graphite or graphite like carbon material, providing lithium ion insertion/extraction channels.Electrolyte: Organic solvents containing li

  • 182025-05

    What is the difference between 36V and 48V (equivalent ampere hours) electric vehicle batteries

    Electric vehicle batteries, 36V and 48V (equivalent ampere hour AH), 48V has a larger capacity, higher range, and stronger power than 36V. At the same time, 48V has a higher cost and larger size than 36V.1、 Differences in Physical Structure and CostComposition of battery cells36V battery: consisting of three 12V cells connected in series, compact in size, suitable for small car frames.48V battery: consisting of four 12V battery cells connected in series, the weight and volume increase by about 30%, requiring a larger installation space.Cost comparisonMaterial cost: Due to the large number of battery cells, the cost of 48V batteries is 20% -30% higher.Maintenance cost: The replacement cost of 48V batteries is 30% -40% higher, and professional equipment is required to test the consistency of battery cells.2、 Performance comparisonPower and speedAcceleration performance: The 48V battery has higher power output, accelerating 1

  • 172025-05

    Application of Cobalt Element in Power Batteries

    1、 Basic characteristics of cobalt elementCobalt (Co) is a silver white ferromagnetic metal with the following key characteristics:Physical properties: high hardness, high tensile strength, melting point of 1495 ℃, density of 8.9g/cm ³, and high temperature stability. Chemical properties: Stable at room temperature, but prone to react with oxygen, sulfur, etc. at high temperatures to form cobalt oxide (CoO) or cobalt trioxide (Co∝ O ₄). Electronic properties: Common valences are+2 and+3, and Co ³ ⁺ plays a role in stabilizing the crystal structure of battery cathode materials.2、 The core role of cobalt in power batteriesCobalt is a key component of lithium-ion battery cathode materials, especially playing an irreplaceable role in the following aspects:Stable crystal structure: Cobalt ions (Co ³ ⁺) occupy specific positions in the layered structure to prevent Li/Ni mixing and ensure smooth migration of lithium ions during c