12/3/2023 0 Comments Charging lithium ion batteries![]() These tabs are the electrical connections to the battery, essentially the battery terminals.įigure 2 – Typical internal construction of a prismatic li-ion cellĬharging a li-ion cell involves using an external energy source to drive positively charged li-ions from the cathode to the anode electrode. Not shown in this figure are the metal tabs that are attached to each current collector. Other popular case types are cylindrical and pouch (commonly referred to as polymer cells). This arrangement is shown in figure 2, which depicts the actual internal construction of a prismatic, or rectangular metal case, cell. In an actual li-ion cell, these layers are typically tightly wound together, and the electrolyte, while liquid, is barely enough to wet the electrodes, and there is no liquid sloshing around inside. Lithium nickel manganese cobalt oxide types are referred to as NMC types, and cells with lithium iron phosphate cathodes are known as LFP cells.įigure 1 – Major components of a typical li-ion cell Thus, lithium cobalt oxide cathode cells are known as LCO cells. Various other types of anode and cathode materials are also used, the most common cathodes typically lend their names to the type description of the battery. Through the data in the log file, the entire charging process can be analyzed to ensure battery charging safety and efficiency.The separator is typically a thin polyethylene or polypropylene film that electrically separates the two electrodes, but allows the transport of lithium ions through it. During the charging process, the log file generated from the CAN Bus Charger Tool monitoring records can also be used to obtain a charging profile. The charging voltage, charging current, and temperature are also monitored and recorded. The broadcast command interval time can also be set to simulate the battery module sending periodic commands to the charger, thereby ensuring normal communication between the battery and the charger. The CAN Bus Charger Tool App will allow you to send commands to the charger to set the charging voltage and current through the isolated CAN Bus communication network. The CAN Bus Charger Tool developed by FSP can simulate battery and charger communication in order to substantially reduce the entire product development schedule and enhance the convenience of verifying product testing. The entire charging process is mainly controlled by the BMS to ensure safety during battery charging. Thus, chargers with a digital communication function have been more extensively used.īefore charging chargers and batteries with a communication function, the battery management system (BMS) in the battery module will send commands to the charger to set the charging voltage and charging current and turn on the charger through the isolated control area network (CAN bus).īattery modules and chargers send periodic commands at fixed intervals to ensure normal communication between the battery and charger. ![]() Therefore, it is essential to have more comprehensive design considerations to ensure battery safety and effective charging. This concerns the life and safety of batteries during operation. When batteries are charging or discharging, the status of each battery cell, such as voltage, current, and temperature should be considered and monitored. The more stringent safety requirements are needed for safety concerns. Lithium batteries with a high string count and high capacity mean they are made up of more battery cells with greater battery energy. ![]() It is quite common that current electric vehicles, electric bikes, and automatic carriers use battery packs with a high string count and high capacity, which results in higher charging safety requirements. It is a focused design consideration especially for lithium battery packs with a high string count and high capacity.ĭesign Considerations for Lithium Battery Charger With an anti-reverse voltage mechanism, the battery, as well as the charger, can be protected. This differs from the way lead-acid batteries are charged.Īs for the anti-reverse mechanism of chargers, if an anti-reverse mechanism is not set up, batteries with an erroneous polarity connection to the charger power supply may result in charger damage or battery short circuits. This method cannot effectively save energy, and floating charging is not recommended for lithium batteries. C depends on the battery pack or battery cell specifications.ĭue to cost considerations, some commercially available chargers do not shut down but remain in the CV mode when fully charged. When the difference between the battery voltage and the maximum charging voltage is less than 100mV and the charging current is decreased to C/10, the battery is deemed fully charged.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |