Page dedicated to the batteries and charger card of the Diskio Pi.
The battery packs
Each battery option consists of 3 packs of 2 cells, for a total of 6 cells.
Detail of one pack
The battery packs of the Diskio Pi terminal are all identical: cable length, connector. This has several advantages:
- Simplified assembly
- Identical internal resistance
- Simplified production
The PCM is the internal electronic circuit of each pack. This is an additional protection, added to the charge/discharge board.
3. Electronic diagram of the PCM:
Length: about 400mm
Molex (51146-0900 2 connectors datasheet)
Detail of one cell
The charger / balance / gauge board
Connectors & switchs
Study in progress
(Precautions for use and guideline for rechargeable lithium polymer batteries)
This "Handling Precautions and Guidelines for Rechargeable Batteries" document must be applied to battery cells distributed by DISKIO PI. It is advisable to contact DISKIO PI in advance if and when the customer requires other operating applications than those described in this document. Further testing may be required to verify performance and safety in such conditions. DISKIO PI will not assume any responsibility in the event of an accident when the cell is used in other conditions. DISKIO PI undertakes to inform clients in writing of improvements in the appropriate use and handling of the cell, if deemed necessary.
- Charge current
The charging current must be less than the maximum charging current specified in the specification approval sheet.
- Charging voltage
The charging voltage must be lower than the maximum nominal voltage of 8.4 V, and the maximum charging voltage is limited to 4.30 V (single voltage per pack).
- Charge temperature
The battery must be charged within the range specified in this specification approval sheet.
Since charging with a constant current or voltage, reverse charging is prohibited. If the measuring cell is incorrectly connected, the battery cannot be recharged. At the same time, reversing the charge can damage the cell, which can lead to electrolyte degradation and damage the safety of the cell, and could generate heat or leakage.
- Discharge current
The cell must be discharged at a discharge current lower than the maximum discharge current specified in the specification approval sheet. If the discharge current is too high, this can significantly reduce the discharge capacity or cause overheating.
- Discharge temperature
The discharge temperature must be within the range specified in this specification approval sheet.
- Excessive discharge
Excessive discharge will result in low battery performance and loss of function. The cell would be in a state of over-discharge due to its load capacity.
- Self-discharge characteristic
In order to avoid excessive discharges, the battery must be recharged periodically to ensure maintenance between 3.75V and 3.9V.
Protective circuit module (PCM) =
The battery pack must be equipped with a PCM that can properly protect the battery pack. The PCM will have the following functions
- Prevention of overloads
The overload prevention function must stop charging if one of the cells of the battery pack reaches 4.30 V.
- Prevention of excessive discharges
The over-discharge protection function must monitor the voltage of each element of the packaging and make every effort to prevent further falls into the element. voltage of 2.75 V or less.
- Overcurrent Prevention
To maintain safety and prevent significant deterioration in cell performance. Overcurrent can occur by external short-circuit.
The cells must be stored at the appropriate temperature specified in the datasheet.