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Lithium battery series parallel definition
2023-08-22
The series parallel of lithium battery is the two basic ways of battery combination, each of which has different characteristics and application scenarios. The following is a detailed definition of the series parallel summary of the Frey lithium battery:
Lithium battery series
Definition: Lithium battery series means that the positive electrode of multiple lithium batteries is connected to the negative electrode of the next battery in turn, forming a current path, so that all batteries are connected in series on the circuit. This connection method can increase the total voltage of the battery pack, while the current remains unchanged, that is, the electrical voltage increases: the total voltage of the battery pack after the series is equal to the sum of the voltages of each cell. For example, if the voltage of each cell is 3.7V, then the total voltage of the two cells in series is 7.4V.
Capacity unchanged: Series does not change the total capacity of the battery pack, the total capacity is still equal to the capacity of a single battery. But as the voltage increases, the total energy (voltage times capacity) increases.
Current requirements: Series is often used for devices that require high voltage but little current demand, such as some remote control models, measuring equipment, etc.
Management requirements: Batteries in series need to be precisely matched to internal resistance, capacity and condition to ensure the performance and life of the entire battery pack. At the same time, a battery management system (BMS) is needed to monitor the status of each battery and ensure safety and performance.
Lithium battery parallel
Definition: Lithium battery parallel means that the positive and negative electrodes of a plurality of lithium batteries are connected together to form a parallel circuit. This connection can increase the total current or capacity of the battery pack while the voltage remains the same, that is, the voltage is equal to the voltage of the individual cells.
Features:
Constant voltage: The total voltage of the battery pack after parallel operation is the same as that of a single battery.
Capacity increase: Parallel connection increases the total capacity of battery strings. The total capacity is equal to the sum of battery capacities. For example, if the capacity of each battery is 2Ah, then the total capacity of the two batteries in parallel is 4Ah.
Current requirements: Parallel is often used for devices that require large currents, such as electric vehicles and UPS power supplies.
Management requirements: Parallel batteries also need to be precisely matched to ensure even current distribution and avoid overload of individual cells. BMS is also needed to monitor battery status, but is more focused on the balance and distribution of current.
Lithium battery PACK
Lithium battery PACK refers to the processing, assembly and packaging of lithium battery packs. The process of assembling lithium cells into groups is called PACK, which can be a single battery or a series-parallel lithium battery pack. The lithium battery Pack is usually composed of a plastic shell, a protective plate, a battery core, an output electrode, a connector, and other insulating adhesive paper, double-sided adhesive paper, etc.
Lithium cell: the core part of the finished battery
Protection board: to overcharge, over discharge, over current, short circuit, NTC temperature control intelligent protection and other functions.
Plastic housing: the supporting skeleton of the entire battery; Positioning and fixing of the protection plate; Carry and limit all other non-housing parts.
Terminal lead: can provide a variety of terminal line charge and discharge interface for a variety of electronic products, energy storage products, backup power supply.
Nickel sheet/bracket: connecting and securing components of the cell
Sum up
The series parallel of lithium battery is two important ways of battery combination, which have different characteristics and application scenarios. Series is mainly used to increase voltage, suitable for high voltage and low current applications; Shunt is mainly used to increase current or capacity and is suitable for high current applications. In practical applications, it is necessary to choose the right combination according to the specific needs, and ensure the accurate matching and effective management of batteries.
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