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Ni-MH battery design methods and design steps

by:Vglory      2021-04-12
Ni-MH battery design method Ni-MH battery designers can design with clear design tasks and sufficient preparations. According to the needs of Ni-MH battery users, there are two ways of battery design: one is to supply rated capacity power supply for electrical equipment and meters; the other is just to give the external dimensions of the power supply, and develop a new specification battery or special-shaped battery with good performance . Ni-MH battery design steps: (1) Determine the number of single cells and working current density in the Ni-MH battery pack. A. According to user requirements, determine the total operating voltage, operating current and other indicators of the Ni-MH battery, select the battery series, and refer to the series' volt-ampere curve. (Experimental data or obtained through experiments) to determine the operating voltage and operating current density of a single battery. B. Determine the number of individual batteries in the battery pack. Number of single cells u003d total working voltage of yellow group/single cell voltage (2) Calculate the capacity of Ni-MH battery A. Calculate the rated capacity according to the required working current and working time. Rated capacity u003d working current × working time to determine the design capacity. Design capacity u003d rated capacity × design factor The design factor is set to ensure the reliability and service life of the battery, generally 1.1~1.2. (3) Calculate the active material content of the nickel-hydrogen battery A. Control the amount of electrode active material. Consumption of active material of single cell of control electrode u003d design capacity × electrochemical equivalent/utilization rate B. Active material content of non-controlled electrode. The effective material consumption of non-control electrodes in a single battery u003d design capacity × electrochemical equivalent × excess coefficient / utilization excess coefficient is generally between 1 and 2, such as mi-ni battery is 1.3 ~ 1.7. (4) Electrode plate design (determine the total area of u200bu200bthe electrode, the number of electrodes, the mass of the single electrode, the thickness of the single electrode). A. According to the working current and the selected working current density, calculate the total area of u200bu200bthe electrode (according to the control electrode). Total electrode area u003d working current/working current density B. Select the appropriate electrode size according to the maximum size of the battery, and calculate the number of electrodes. Number of electrodes u003d total electrode area/plate area C. Calculate the active material content of a single electrode based on the active material content of the positive and negative electrodes of a single battery and the number of electrodes. The amount of a single positive (negative) electrode material u003d the amount of positive and negative electrode materials in a single battery/the number of positive (negative) electrode pieces D. Determine the thickness of a single electrode The thickness of the positive and negative service substance concentration network of each dose The average thickness of the positive (negative) electrode piece u003d Positive (negative) pole piece material consumption / (material density × pole piece area × (1- porosity)) + collector net thickness in the type of collector net thickness u003d net weight / (mass density × net area) (5) The selection of battery separator materials and the determination of thickness and number of layers are based on the battery series and design requirements, select the appropriate battery separator material and thickness, and determine the required number of separator layers according to the specific design. (6) Determine the concentration and amount of electrolyte according to the characteristics of the selected battery series, according to specific battery design requirements and use conditions (such as operating current, operating temperature, cycle performance, etc.) or relevant empirical data to determine the concentration and Dosage. The smaller the amount of electrolyte, the better to ensure that the battery does not leak. (7) To determine the airtightness of the battery and the size and airtightness of the single battery, the following formula can be used to calculate the total thickness of the elastic rod + the total thickness of the diaphragm × 100% the inner diameter of the battery. Regarding the cylindrical cell, the total length of the cross-sectional area airtight pole piece The thickness of the pole piece + the total length of the diaphragm. The thickness of the diaphragm is 100% of the cross-sectional area of u200bu200bthe battery. The cross-sectional area of u200bu200bthe battery is equal to T multiplied by d2D, which is the inner diameter of the battery. The airtightness of the battery is determined according to the battery characteristics of the selected series and the electrode thickness of the designed battery. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.
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