Assembly process of Lithium-iron phosphate battery

Assembly process of Lithium-iron phosphate battery

Brief introduction about lithium-iron phosphate battery

The lithium -iron phosphate battery refers to a lithium ion battery using lithium-iron phosphate as a positive electrode material. The positive electrode materials of lithium ion batteries mainly include lithium cobaltite, lithium manganite, lithium nickel ate, ternary materials, lithium-iron phosphate and the like. Among them, lithium cobaltite is the positive electrode material used in most lithium -ion batteries.

Lithium-iron phosphate battery structure and working principle

The internal structure of the LiFePO4 battery shown in Figure 1. On the left is the olivine-structured LiFePO4 as the positive electrode of the battery. The aluminum foil connected to the positive electrode of the battery. The middle is the polymer separator. It separates the positive electrode from the negative electrode, but the lithium ion Li+ can pass and the electron e- cannot pass. The right side is composed of A battery negative electrode composed of carbon (graphite) is connected to the negative electrode of the battery by a copper foil. Between the upper and lower ends of the battery is the electrolyte of the battery, and the battery is hermetically sealed by a metal casing.

I understand the assembly process of lithium -iron phosphate battery

When the LiFePO4 battery is charged, the lithium ion Li+ in the positive electrode migrates toward the negative electrode through the polymer separator; during the discharge, the lithium ion Li+ in the negative electrode migrates toward the positive electrode through the separator. Lithium-ion batteries named after the lithium ions migrate back and forth during charging and discharging.

Characteristics of lithium-iron phosphate battery

High efficiency output: standard discharge is two~5C, continuous high current discharge can reach 10C, instantaneous pulse discharge (10S) can reach 20C.

Good performance at high temperature: the internal temperature is as high as 95 °C when the external temperature is 65 °C, and the temperature is up to 160 °C when the battery discharged. The structure of the battery is safe and intact

Even if the inside or outside of the battery is damaged, the battery does not burn, does not explode, and has the best safety;

Excellent cycle life, after 500 cycles, its discharge capacity is still greater than 95%;

There is no damage from over discharge to zero volts;

Fast charging;

Low cost;

No memory effect: Rechargeable batteries work under conditions of constant exhaustion, and the capacity will quickly fall below the rated capacity. This phenomenon called memory effect. Nickel-metal hydride and nickel-cadmium batteries have memory, but lithium-iron phosphate batteries do not have this phenomenon. No matter what state the battery is in, it can used with charging, no need to discharge and recharge.

The volume of the lithium -iron phosphate battery is small and light, the volume of the lithium-iron phosphate battery of the same specification is 1/3 of the volume of the lead-acid battery, and the weight is 1/3 of the lead-acid battery.

No pollution to the environment, the battery does not contain any heavy metals and rare metals (Ni-MH batteries need rare metals), non-toxic (SGS certification passed), no pollution, in line with European ROHS regulations, is an absolute green battery. There is a large amount of lead in the lead-acid battery, and if it is improperly disposed after disposal, it will still cause secondary pollution to the environment, and the lithium-iron phosphate material is free from pollution during production and use.

Assembly process of Lithium-iron phosphate battery

How to solder the soft pack battery pack, the demonstration uses A123 soft iron lithium, 20AH single battery.

1. Select the appropriate battery core, battery type, voltage, internal resistance to match, please balance the battery before assembly.

Cut the electrode and punch it.

2. Calculate the distance according to the hole and cut the insulation board.

Three, good screws, please use the flange nut to prevent the nut from falling off, the good screw connection, you can fix the battery pack.

4. When connecting and welding the wire and connecting the voltage collection line (equalization line), do not connect the protection board to avoid accidental burning of the protection board.

5. The insulating silica gel fixed again. This silica gel will cure for a long time. . .

6. Place the protection board. If you forget to balance the battery before, this is the last chance before the battery assembled. You can balance it by the equalization line.

7. Then use the insulation board to fix the whole battery pack. It sealed with nylon tape. The nylon tape is more durable. Please note that we have not used the steel material shell. The steel material shell is beautiful and firm, but the battery core is difficult to guarantee. Some cases that not handled properly may scratch the battery and cause leakage, even if the insulation is not good.

8. Then overall package of battery, please be sure to fix battery and protection board, our battery measured 1 meter height drop still guarantee normal work.

9. The final package is completed, and output input is made of silicone wire. The whole is a lithium-ion battery, 48V20AH battery pack, the battery pack has a single weight of 9 kg and the weight is half that of the same acid battery.

10. We did some test after battery completed and it could meet our requirements.

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