24V 24Ah (7S9P) LITHIUM-ION RECHARGEABLE BATTERY
A 24V 24Ah (7S9P) lithium-ion rechargeable battery is a specific arrangement of lithium-ion cells designed to achieve a desired voltage and capacity. Here’s a detailed description of this battery configuration:
### Configuration
1. **7S (Series)**: This indicates that 7 cells are connected in series. Each lithium-ion cell typically has a nominal voltage of 3.6V to 3.7V. Connecting cells in series adds up their voltages.
– **Total Voltage**: 7 cells * 3.6V = 25.2V (nominal). This is commonly referred to as a 24V battery for standardization.
2. **9P (Parallel)**: This means 9 sets of the series-connected cells are connected in parallel. When cells are connected in parallel, their capacities add up.
– **Total Capacity**: If each cell has a capacity of 2.67Ah (24Ah / 9), then 9 cells in parallel give a total capacity of 24Ah.
### Specifications
– **Voltage**: 24V (nominal), which is the combined voltage of 7 cells in series.
– **Capacity**: 24Ah, achieved by connecting 9 sets of cells in parallel.
– **Energy**: The energy capacity can be calculated as Voltage * Capacity. For this battery, it would be 24V * 24Ah = 576Wh.
– **Cell Type**: Typically, lithium-ion cells such as 18650 or 21700 cells are used in these configurations.
– **Configuration**: 7S9P, meaning 7 cells in series and 9 parallel sets of these series-connected cells.
### Applications
This type of battery is suitable for applications requiring a balance of high voltage and substantial capacity, such as:
– **Electric Vehicles**: Bikes, scooters, and small electric cars.
– **Portable Power Tools**: Providing extended runtime for cordless tools.
– **Solar Energy Storage**: Storing energy generated from solar panels for later use.
– **Uninterruptible Power Supplies (UPS)**: Ensuring continuity of power in case of an outage.
– **Electric Robots and Drones**: Offering a reliable power source for extended operations.
### Advantages
– **High Energy Density**: Lithium-ion batteries provide a high energy density, making them suitable for applications where space and weight are considerations.
– **Long Cycle Life**: These batteries can endure many charge and discharge cycles, making them cost-effective over time.
– **Low Self-Discharge**: Compared to other battery chemistries, lithium-ion batteries have a low self-discharge rate, maintaining charge for longer periods when not in use.
– **Lightweight**: They are significantly lighter than other types of rechargeable batteries like lead-acid batteries.
### Safety Considerations
– **Battery Management System (BMS)**: It’s crucial to incorporate a BMS to protect against overcharging, over-discharging, and short circuits. The BMS helps balance the cells, ensuring longevity and safety.
– **Handling**: Avoid physical damage, puncturing, or exposing the battery to extreme temperatures. Lithium-ion batteries can be hazardous if mishandled.
### Charging and Discharging
– **Charging Voltage**: The typical charging voltage would be around 29.4V (4.2V per cell * 7 cells).
– **Charging Current**: The charging current should be within the recommended range specified by the cell manufacturer, often between 0.5C to 1C of the battery’s capacity.
– **Discharge Cutoff Voltage**: The cutoff voltage for discharge is usually around 3.0V per cell. For a 7S battery, this would be 21V.
Understanding these details ensures proper usage and maintenance of your 24V 24Ah (7S9P) lithium-ion rechargeable battery, optimizing its performance and lifespan.
