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Battery packs

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This page is a translated version of the page Batteries and the translation is 100% complete.

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Page dedicated to the batteries and charger card of the Diskio Pi.

The battery packs

visual of the battery packs

Each battery option consists of 3 packs of 2 cells, for a total of 6 cells.

Detail of one pack

7.4V pack dimensions

Pack infos.png

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

PCM

The PCM is the internal electronic circuit of each pack. This is an additional protection, added to the charge/discharge board.

PCM characteristics

PCM BOM

3. Electronic diagram of the PCM:

PCM circuit

Cables

Quantity: 2
Type: UL1007
Length: about 400mm
AWG: 20

Connector

Molex (51146-0900 2 connectors datasheet)

Detail of one cell

Détail cellule.png

The charger / balance / gauge board

Visual

Visual of the charge / balance / jauge PCB

Connectors & switchs

3 x connecteurs to battery packs: Molex 537800270 2 pins (datasheet)
1 x connector to daughter board: ERNI 109914 2 pins (datasheet)
1 x swich test jauge: EVQ9P701P (datasheet)

Board datasheet

Study in progress

Battery precautions

(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

  • 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.

  • Remarks

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.

Discharging

  • 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.

Storage

The cells must be stored at the appropriate temperature specified in the datasheet.