This conversion is taking place with an associated loss. 10/25/20 - Battery database: Sony US18650VTC6, Molicel INR21700-P42A added. The battery pack peak power Pbpp [W] is the product between battery pack peak current Ibpp [A] and the battery pack voltage Ubp [V]. The string continuous current Iscc [A] is the product between the continuous C-rate of the battery cell C-ratebcc [h-1] and the battery cell capacity Cbc [Ah]. FLA - "Full Load Amps" - amount of current drawn when full-load torque and horsepower is reached for the motor. The consumption for one kilometer usually is between 4 and 10 watt hours. Note: Since battery cells manufacturers come up with newer models continuously, it might be the case that the data used in this example is obsolete. Generally, EODV ranging between 1.750V and 1.80Vis utilized per cell when discharging time is longer than 1 hour. and intermittent loads (heater, brake lights, wipers, etc.) Single-phase voltages are usually 115V or 120V, while three-phase voltages are typically 208V, 230V or 480V. Image: Battery cell volumetric energy density, Image: Battery cell gravimetric energy density. The calculation is: Volts x (Amp Draw / MPH ) = Wh/m Battery Pack Size (KWH): Pack Voltage x Amp-Hour rating of battery = KWH Usable Battery Pack Size: Unfortunately, we can not use all of our battery Pack or we will kill our batteries extremely fast. The mass and volume are calculated only at cell level, taking into account the cell dimensions and mass. A battery cell consists of five major components: electrodes – anode and cathode, separators, terminals, electrolyte and a case or enclosure. For our application we are going to consider a nominal voltage of 400 V. In the article EV design – energy consumption we have calculated the average energy consumption for propulsion Ep as being 137.8 Wh/km on WLTC drive cycle. The battery pack which will be in the vehicle will have additional components (wires, electronic components, soldering, case, etc. For automotive applications there are different types of cells used [1]: Image: Different shapes of Lithium-ion battery cellsCredit: [1]. Check the nominal voltage of each of the products you selected: 1. document.getElementById("comment").setAttribute("id","afd0e8b082fd9fdfee6ab111ae8719e9");document.getElementById("e4df9a918e").setAttribute("id","comment"); Dear user, Donate to support this channel. Range at one battery charging: km. 20*1/3600 + 0.1 (3599)/3600 = 0.1044 amps average current. The battery size calculator derates the battery linearly based in this characteristic. For the auxiliary devices energy consumption we are going to use data from [3], which contains the typical power requirements of some common vehicle electrical components (auxiliary loads). 10.1016/j.promfg.2017.02.013. The input parameters of the battery cells are summarised in table below. , If the load is specified in watt, the current. Depending on the battery parameters, there may be several levels of modularity. Disclaimer: The calculated values are only approximate. BatteryStuff Tech The draw amount is what we need to calculate with. Check your browser Javascript settings or try a different browser. The number of battery cells connected in series Ncs [-] in a string is calculated by dividing the nominal battery pack voltage Ubp [V] to the voltage of each battery cell Ubc [V]. Hence, the final version of the battery capacity formula looks like this: E = V * Q. where The direct current (DC) supplied by the battery is converted into alternated current (AC) by the inverter. A battery rated at 36 V and 10.4 Ah will have a 417.6 Wh capacity (36 x 10.4 = 374.4), like on the Eunorau UHVO All-Terrain Ebike; A battery rated at 48 V and 21 Ah will have a 1,008 Wh capacity (48 x 21 = 1,008), like on the Bakcou Mule. The total number of strings of the battery pack Nsb [-] is calculated by dividing the battery pack total energy Ebp [Wh] to the energy content of a string Ebs [Wh]. Battery bank capacity Finally we can calculate the minimum battery AH capacity. For our electric vehicle battery design we are going to start from 4 core input parameters: A battery consists of one or more electrochemical cells (battery cells) which are converting chemical energy into electrical energy (during discharging) and electrical energy into chemical energy (during charging). (3600 is the number of seconds in an hour). Motor protection and motor circuit protection require different calculations. The required battery size \(B_{lead-acid}\) for lead-acid batteries is calculated by the battery size calculator as. [3] Tom Denton, Automobile Electrical and Electronic Systems, Third edition. However it seems that a battery pack with pouch cells is slightly heavier and bigger. - in the calculator above FLA is RLA + 25%. 9/15/20 - Motor database: Surpass brand added (2015). They are typically rated for a discharge rate over 20 hours. A battery cell can be regarded as the smallest division of the voltage. In order to increase the current capability the battery capacity, more strings have to be connected in parallel. The size and mass of the high voltage battery are very important parameter to consider when designing a battery electric vehicle (BEV). For example, 3 strings connected in parallel will triple the capacity and current capability of the battery pack. Elsevier Butterworth-Heinemann, 2004, page 129. The voltage of each cell is 3.7 V and the total voltage of the battery pack 330 V. Image: Battery pack (modules and cells)Credit: Mitsubishi. There are several types of batteries (chemistry) used in hybrid and electric vehicle propulsion systems but we are going to consider only Lithium-ion cells. In this document, we have provided some important methods, formulas and calculation … Mike Holt. Various parts of the robot will stop working at different times 2. Individual battery cells may be grouped in parallel and / or series as modules. ** If & when DC-DC converter is required, please use 0.85. With the above cell parameters and the core requirements for the battery (nominal voltage, average energy consumption and vehicle range), we calculate the main parameters of the high voltage battery. For a 18650 2500mAh(2.5Ah) battery with a device that draws 500mA(0.5A) you have: 2.5Ah/0.5A=5 Hours. The following calculations are going to be performed for each cell type. The number of strings must be an integer. For other voltage, consult Trojan Battery for advice. Important numbers for such a battery are the voltage in volts (V), the electric charge in ampere hours (Ah) and the electric energy in watt hours (Wh). 1. This calculator can be used to estimate the battery pack size for a DIY electric bike kit, based on the type of riding and the typical distance traveled. Nevertheless by looking only at cell based volume and mass, we can estimate which model will be better compared to the other. This calculator covers the basics which probably applies to 90% of the needs. Because of the low capacity for the cylindrical cells, compared to the pouch cells, the number of cells required for the battery pack is significant higher. The required battery size B l i − i o n for litium-ion batteries is calculated by the battery size calculator as: B l i − i o n = 100 ⋅ I ⋅ t 100 – Q where, I is current in ampere, t is the duration in hours and Q is the required remaining charge in percentage. Battery capacity is specified either in kilowatt hours, or amp hours. Total weight of vehicle: kg - more information. Whether its a 3-phase or single phase voltage supply. Formula and Equations for Battery Capacity Calculator Battery Capacity in mAh = (Battery life in hours x Load Current in Amp) / 0.7 Battery Capacity = (Hours x Amp) / Run Time % use on average 430 W of electrical power. The battery pack continuous current Ibpc [A] is the product between the string continuous current Iscc [A] and the number of strings of the battery pack Nsb [-]. The type of elements contained within a battery and the chemical reactions during discharging-charging events define the chemistry of a battery. 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