The 32650 lithium iron phosphate battery cannot be charged to 3.5V for the following two reasons:
1. The battery is broken.
2. The battery has reached the life limit of this charge cycle and must be replaced with a new one.
Please note that not all batteries can accept the charging voltage of 3.5V. It is recommended to charge according to the battery's rated voltage. If it cannot be charged, you may need to check the battery or. its charging circuit. Additionally, overdischarging or overcharging can also damage the battery, and it is recommended to avoid both situations when using batteries.
The lithium battery of the electric vehicle has 13 series and 4 parallels. Two slots are 3.5V and 3.6V respectively, and the rest are 3.7V. Is this lithium battery normal?
Pacific Automotive Network does not have a standardunified. 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. According to battery industry standards, this voltage is approximately 1.2 times the rated voltage value. Par example, for a 3.6 V cell phone battery, the end of charge voltage is 4.2 to 4.3 V.
The working principle of the end of discharge 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. The termination voltage can be designed to be lower, for example 2.5 V and 2.4 V, but it is not lower than 2.4 V.
If the tempOperating temperature during discharge is -20 to 60°C, a lithium battery with a termination voltage of 2.75V can effectively continue to discharge, but it should not be lower than 2.5V. , as mentioned before, the loss between 2.75V and 2.5V may be partial, and below 2.5V 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 discharge cut-off voltage of this lithium battery is 2.75V ×3. =8.25V. In practice, the minimum cannot be less than 2.5V×3=7.5V.
(Images/Text/Photos: Pacific Automotive Network Calling the Beast Q&A)
This shows that the consistency of the batteries in the battery pack is very bad. It is recommended to use the existing charger to charge it first, and then measure the voltage of each node. If the voltage of the two abnormal places is still relatively low, recharge the two groups separately (get a few extra positives from fully charged lithium battery). and the abnormal battery connect the positive terminals together, connect the negative terminals together and recharge separately) to make the voltage consistent with other batteries. At this point, you can drive normally and see if there are still any inconsistencies in the end. After repeating it twice, if there are still inconsistencies, it means that this set of batteries is no longer good unlesse replace the two abnormal ones.