How much does the voltage drop when a lithium iron phosphate battery is discharged at a high current

Introduction Pacific Automotive Network does not have a unified standard on lowering the high current discharge voltage of lithium iron phosphate batteries. After all, there are still some differences in the production and manufacturing processes of each manufacturer.

How much does the voltage drop when a lithium iron phosphate battery is discharged at a high current

Pacific Automotive Network does not have a unified standard. After all, there are still some differences in the production and manufacturing processes of each manufacturer. Of course, the voltage drop of a good battery cell is very slow once it is fully charged. The voltage drop of most lithium iron phosphate cells when fully charged is around 3.3 to 3.5. If the voltage drops and remains at 3.5, it is indeed an A+ quality battery cell.

Generally, the working voltage of lithium batteries is 3.7V and the termination voltage is 3.2V; The operating voltage of lithium iron phosphate batteries is 3.26 V and the termination voltage is 2.5 V. The voltage to which a lithium iron battery is fully charged is called "termination charge voltage" in the industry. By battery industry standards, this tension is approximately 1.2 times the rated voltage value. For example, for a 3.6 V cell phone battery, the charge termination voltage is 4.2-4.3 V.

The working principle of discharge termination voltage lithium iron batteries: The rated voltage of a single lithium iron battery is generally designed to be 3.7 V, and the termination voltage is 2.75 V. There are two situations. encourage manufacturers to increase the upper limit of the termination voltage to 3.0V.

First, the electrochemical properties determined by the lithium battery material, which are often considered from the perspective of 'safer use of the battery;

The second is the relationship with specific electrical products and connected to the electrical environment. Of course, there is also the opposite situation. Termination voltage can be designed to be lower, e.g. 2.5V and 2.4V, but it is not less than 2.4 V.

If the operating temperature during discharge is between -20 and 60 °C, a lithium battery with a termination voltage of 2 .75 V can actually continue to discharge, but it should not be less than 2.5 V. As mentioned before, the loss between 2.75 V and 2.5 V can be partial, and below 2. 5 V, it will cause the most serious damage, rendering the battery unusable.

The lithium iron battery also has a termination voltage. This lithium battery is sometimes called core lithium battery. The discharge termination voltage of core lithium battery should not be less than 2.75 × n. Cell battery most commonly used in laptops Let's take lithium batteries as an example. This 6 cell lithium battery often uses a combination of 3 series and 2 parallel. Therefore, the cutting voltagedischarge re of this lithium battery is 2.75V × 3. =8.25V. In practice, the minimum cannot be less than 2.5V×3=7.5V.

(Photo/Text/Photo: Pacific Automotive Network Q&A)

The voltage range of the lithium iron phosphate battery will basically be within between 3.2 V and 3.6 V. between.

Lithium iron phosphate battery is a type of lithium battery. The positive electrode material of lithium iron phosphate battery is mainly a compound of phosphorus, acid, iron and lithium. Generally speaking, the voltage range of lithium iron phosphate batteries is basically between 3.2V and 3.6V. Among them, the rated voltage is 3.2V, the high-end charging voltage is 3.6 V, and the discharge cut-off voltage is 2.0 V. However, the positive and negative electrode materials, electrolytes and production processes used by eache manufacturer are different, so there will be differences in performance. The lithium iron phosphate battery achieves the voltage required by the device through the series combination of cells. Battery voltage = N * number of series connections.

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