The 18650 battery does not necessarily require a charging module, but in order to better protect the device and guarantee safe use, it is recommended to use a charging module to charge the battery. The charging module has multiple protection functions to prevent overcharge, overdischarge, short circuit, etc. of the battery, and avoid dangers such as spontaneous combustion and explosion inside the battery. In addition, the charging module can also provide more precise current and voltage regulation to avoid battery damage due to abnormal conditions during charging. Therefore, even if you use the 18650 battery without a charging module, you should still operate it carefully to avoid overcharging, short circuit, etc. drums. Reduce battery performance or cause security risks.
The internal reasons why the battery cannot be charged include: the battery has zero voltage or there is a battery with no voltage in the combination battery. The zero voltage battery is either a defective product itself, which has not reached the corresponding rated capacity and voltage value when it leaves the factory, or it has died due to long-term use, the capacity is exhausted and the voltage drops. to zero. Taking into account that after long-term storage, for example more than a year, lithium batteries can discharge all their energy through self-discharge and reduce the voltage to zero. The current maintenance plan for lithium batteries requires that the battery can be charged even when charged. the voltage is zero. So there are two differences between zero voltage batteries: one can be charged and used continuously, and the other has no use value, in other words, the capacity loss of the first is reversible,while that of the second is irreversible; If a zero-voltage battery that cannot be charged is unfortunately designed into a lithium battery, the zero-voltage signal can be transmitted to the battery through the protection chip, and then the MOSFET will be turned off, making the battery unable to charge.
Error connecting to point pool group. The possibility of this situation is low, as rechargeable batteries or battery packs generally need to be fully inspected before leaving the factory. Batteries from common manufacturers are in this situation, unless a certain batch of batteries is not fully inspected before leaving the factory. A bad battery is connected. It is on the unchecked list. Of course, the situation is completely different for products manufactured by informal manufacturers or assembled by individuals. Connection errors cannot be completely eliminated. RelativeSpeakingly, the complete inspection rate of nickel-metal hydride batteries is lower and the probability of such errors may be greater. The internal electronic components and protection circuits are abnormal. This situation may occur after prolonged use of the battery. Aging and falling of electronic components will cause the battery to charge abnormally. In particular, the electronic components built into the protection circuit will directly affect the protection function of the circuit if the above situation occurs. occurs, and the charging process cannot be experienced properly.
External reasons that lead to charging failure during charging include: the charger and the battery are not suitable, especially the difference in charging current planning between the unmatched charger and the battery lithium battery will result in excessive instantaneous currentf while charging, lithium batteries implement overcurrent protection and continuous charging. To remedy this mismatch, take special care not to mix nickel metal hydride chargers and lithium chargers. Some all-purpose chargers should also be used in the most “all-purpose” way possible. Disadvantages of charging equipment: no output voltage. If this happens, simply place the battery on another charger of the same type to charge it. Unsuitable charging environment. The charger and rechargeable battery have their own working environment, which exceeds the requirements of either. A stress condition, whether high or low temperature, will make charging impossible.
Generally speaking, the electric vehicle battery processing system should perform the following functions: First, accurately estimateion the state of charge of the power battery, that is, the remaining power of the battery, to ensure that the SOC is maintained within a reasonable range. To prevent battery damage due to overcharging or overdischarging, it can predict the amount of energy remaining in the hybrid vehicle's energy storage battery or the charging status of the hybrid vehicle at any time. the energy storage battery.
Second, dynamically monitor the operation of the power battery. During the battery charging and discharging process, the terminal voltage and temperature of each battery in the electric vehicle battery pack, the charging and discharging current and the total voltage of the battery pack are collected in time real to prevent the battery from overshooting.
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