Four steps to the custom design of T20 agricultural drone battery

T20 agricultural drone

On the afternoon of November 5, 2019, the DJI Agricultural 2020 new product launch conference was held in Shenzhen with the theme of “Heroes Everywhere”. DJI Agriculture released the new Plant Protection Drone T20, Sowing System 2.0, as well as related service assurance and training empowerment programs.

T20’s Smart Drone Battery

The T20 is equipped with a new drone battery. It uses a more costly chemical system with 3.5C charging 9C discharge capacity. When working, the heat is reduced by 50%, the temperature rise is reduced by 10 degrees Celsius, and the charging temperature can be tolerated by up to 55 to 60 degrees Celsius. This ensures that the battery can be recharged on the ground, without the need for additional cooling.

Four standards for a good drone battery

Many fliers and drone companies are curious about how a drone battery is so intelligent. It is well known that a good-performance drone battery has four characteristics, high C-rate, high voltage, high energy density, and high capacity. However, any drone battery may not suit your own needs and may increase the unnecessary cost of the battery. Therefore, you may need a  customized battery solution. Come with Grepow battery experts today to see how drone batteries are designed.

smart flight battery

What are the designs of drone battery

The design of drone battery includes performance design, structural design and battery management system (BMS) design. Performance design refers to the design of voltage, capacity and life. The structural design refers to the design of lithium battery shell, diaphragm, electrolyte and other structural parts. The battery management system is designed to be based on industrial grade ARM-32 bit processor and matches high-precision AFE front-end acquisition chip to realize precise measurement and intelligent management of key parameters such as voltage, current, temperature, capacity and life cycles of each cell.

Comprehensive analysis of flight technical indicators

The first step is to make a comprehensive analysis of various given drone technical indicators to identify the key issues of battery design. Usually in order to meet the technical requirements of the entire drone, the proposed battery technical indicators are operating voltage, voltage accuracy, operating current, working time, mechanical load, life and environmental temperature. The main indicators are the operating voltage , capacity and battery C-rate.

customized polymer lithium batteries

Performance design of drone battery

The second step is to design the battery performance. Based on the key problems to be solved, combining the previous accumulated test data and the experience accumulated in the production practice, determining the appropriate working current density and selecting the appropriate process type, so as to make a reasonable voltage and other performance design.

Depending on the capacity required for the actual drone battery, select the appropriate design capacity to determine the proportion of the active substance. Choose the right diaphragm material and external housing material to determine the design of battery life. The selection of materials should be based on the requirements of the battery, under the premise of controlling costs, as far as possible to select new materials. Of course, these designs are interrelated, design should be considered comprehensively, not inclined to any aspect.

agricultural drone battery

Structural design of drone battery

The third step is to design the battery structure. It includes the determination of form factor, the design of the electric core, the design of the electrolyte, the design of the diaphragm, as well as the design of the guide grid, pole column, pore, etc. For the battery pack, precise pairing between the cells, battery pack housings, connector types, and the design of the battery heating system is also performed.

BMS design of drone battery

The fourth step is to carry out BMS design according to the needs of the drone flight environment and the needs of flight time. The Battery Management System is a piece of hardware with an electronic system on board that manages a rechargeable battery (cell or pack) and is the link between the battery and it’s user. BMS can more intelligently manage and maintain each cell, improve battery utilization, prevent battery overcharge and discharge, pro-long battery life, and monitor battery status.

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