OEM 12v 400ah Lithium Battery For Trolling Motor

Support the production process of OEM12V lithium batteries: the entire process chain from battery cells to finished products

1. Battery cell preparation and selection
Cell type: A 12V lithium battery is typically composed of 3 to 4 3.7V lithium-ion cells (such as 18650, 21700 cylindrical cells, or pouch, square aluminum shell cells) connected in series (3.7V×3≈11.1V, 3.7V×4≈14.8V, and requires a BMS to reduce the voltage to 12V).
Core technology:
Electrode sheet production: The positive and negative electrode materials (positive electrode: lithium iron phosphate/ternary material + conductive agent + binder; The negative electrode (graphite) is coated on aluminum/copper foil, dried and then cut.
Cell assembly: The positive and negative electrode sheets are combined with the separator (which isolates the positive and negative electrodes to prevent short circuits) by winding (cylindrical/pouch) or laminating (square) methods, the electrolyte is injected, and the casing is sealed.
Activation and capacity separation: Activate the cells during the first charge and discharge. Screen and match the cells based on capacity, voltage and internal resistance to ensure consistency in series groups (inconsistency will lead to overcharging and overdischarging, affecting the lifespan).

2. Battery pack integration
Circuit design
BMS (Battery Management System) : It must integrate overcharge/overdischarge/overcurrent/short-circuit protection, balance the cell voltage (the voltage difference of series cells ≤50mV), and some BMS support temperature monitoring (operating temperature -20 ℃ to 60℃, heat dissipation/heating is required if exceeded).
Wiring layout: The series wires of the battery cells should use wires of appropriate cross-sectional area (for example, in a 160AH high current scenario, the cross-sectional area of the wire should be ≥10mm² to reduce internal resistance and heat generation), and the solder joints need to be tin-plated to prevent oxidation.
Enclosure and Protection:
Sheet metal shell processing: Cold-rolled steel plates are formed by stamping, with insulating barley paper pasted on the inner wall. Heat dissipation holes and installation holes are reserved, and the surface is sprayed with anti-corrosion coating (such as epoxy resin). The waterproof grade can reach IP54 (splash-proof).

3. Testing and Quality Inspection
Performance testing: Charge and discharge cycle testing (≥500 cycles under standard working conditions, capacity retention rate ≥80%), high and low temperature testing (discharge capacity ≥70% at -20℃, charging efficiency ≥90% at 60℃).
Safety tests: Short-circuit test (simulating whether the BMS cuts off the circuit within 10ms when the wire is short-circuited), compression test (no fire or explosion under 1000N pressure), drop test (no cracking of the shell when dropped from a height of 1.5m).

4.

Tianjin Liwei New Energy Technology Co., Ltd., formerly known as Tianjin Lingwei Photovoltaic Technology Co., Ltd., was founded in 2006. It has a professional automated production workshop and R&D team. It is a domestic manufacturer specializing in the research and development, production, operation, and one-stop support of lithium battery energy storage and solar power supply systems. The annual production capacity of lithium batteries is 200 million watt hours.

At present, the leading products include lithium iron phosphate batteries, ternary lithium batteries, storage and control integrated machines, solar power supply systems, household energy storage systems, outdoor mobile power supplies, solar street lights, solar monitoring, etc. The company has established a global marketing layout, and its products have been exported to countries such as Europe, the Middle East, South Africa, Africa, Mongolia, Australia, as well as domestic application units and remote areas.

Liwei New Energy adheres to the business philosophy of "being responsible to society, customers, and ourselves", constantly learning, pursuing excellence, and innovating. By relying on the advantages of large-scale production, innovation, brand, and talent accumulated over a long period of time, we can change the way humans use energy, change their way of life, and achieve sustainable development of world civilization.

In the future, the company will further devote itself to developing new energy and become a comprehensive solution service provider for new energy, providing high-quality one-stop clean energy services.