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Oct 18, 2021

Homemade lithium battery tutorial

 1, the battery does not need to be "activated"


  Lithium batteries do not need the first three charges beyond 12 hours, lithium batteries have no memory.


  2、Battery charging


  Use the charger specified by the manufacturer to charge, and pay attention to whether the charger model matches the battery model when charging.


  3、Prevent high temperature charging


  Do not charge the lithium battery in an environment where the temperature exceeds 40 °, high temperature will cause the battery capacity to decline.


  4、Charge in time


  Lithium batteries as far as possible with the implementation of the charge, to prevent the battery each time the battery is under voltage and then charged, which can greatly enhance the battery life.


  5、Storage


  Long-term non-use of the battery should be disconnected from the battery and the vehicle, and a period of time to the battery to replenish some power to prevent self-discharge, or protection plate power consumption will overcharge the battery.


  Lithium batteries are afraid of overcharging more afraid of over-discharging. But lithium batteries do not have memory effects, can be used with the charge. Do not charge only when the electricity is completely used up, so that simple over-discharge injury to the battery; do not discharge at high current, in places where the slope is large, it is best to use the pedal to help prevent the battery current is too large, affecting the battery life. By the same token, the load specified in the manual should be prevented from being exceeded. Charger generally have overflow protection, generally will not form overcharge, but late at night, the grid load is very light, the voltage rises very high, simple beyond the charger set overflow self-stop voltage, and will continue to charge the battery, which is simple to form overcharge, late at night, the charger should be unplugged.


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  The detailed production method of lithium battery

  Method 1: Pulp is made by mixing special solvent and bonding agent with powdered positive and negative active materials respectively, and then mixed evenly at high speed to make pulp-like positive and negative materials.


  Approach 2: Coating the slurry material evenly on the surface of metal foil, drying, and making positive and negative electrode sheets respectively.


  Method 3: Installation is done in the order of positive electrode sheet - barrier - negative electrode sheet - barrier from top to bottom, and the battery core is made by winding, and then the process of injecting electrolyte and sealing is completed, i.e. the battery installation process is finished and the product battery is made.


  Method 4, chemical into a special battery charging and discharging equipment for the product battery charge and discharge test, each battery are tested, screening out qualified product battery, you can complete the production.


  OK. cathode generally have lithium cobaltate, lithium iron phosphate, lithium manganate, lithium nickel acid, ternary information. The negative electrode is generally used graphite. When preparing the positive electrode, the positive electrode material, PVDF, conductive carbon black according to a certain share, such as 90:5:5 for grinding, grinding must be uniform, and then participate in the NMP slurry, scraping with a scraper on the aluminum foil for scraping. Put it into the oven to dry and let the NMP evaporate. Then put it into the vacuum oven to dry. Negative electrode preparation the same way, but the material for graphite, graphite, conductive carbon black, PVDF mass share 93:2:5. scraping process is a technical work, may do N many times the electrode material can not be used. Must be uniform.


  Install the battery, button cell, negative shell, steel, negative electrode, a few drops of electrolyte, barrier, positive electrode, steel, a few drops of electrolyte, steel ring, positive shell. Then press and compact. Stop for more than 8 hours before being able to charge and discharge.


If you have any demands in batteries, please feel free to contact info@manlybattery.com

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