Cell board, small cylindrical, multiple cells

Each of these cell boards handles a number of small cylindrical cells in series, mounted side-by-side, in which cells in series are oriented in alternating polarity (as opposed to a 1SC0100, which handles a single cell). Matched to industry standard 18650 and 26650 sizes Mounted on the side of the cells, by their welding tabs One Cell Board per a number of cells (or sets of multiple cells in parallel) Simplifies installation and improves reliability (though at the cost of loss of flexibility, compared to single-cell cell boards) Very thin, components are placed in space between cells: as little as 0.05" is added to battery dimensions A single communication wire is used between adjacent cells in a bank These cell boards are done to order and require a BMS master to form a complete BMS

⇪Applications

Multiple cell boards are installed onto the cells easily. Installation is straightforward: Place cell board on the cells Fold the tabs from the cells down onto the cell board Solder the tabs

Cell board for 15 cells in series; straight (top) and mirror (bottom) Installing the cell board on a pack.

⇪Compatibility

These standard Cell Boards are compatible with a wide range of Li-Ion small cylindrical cells available on the market today, including:

⇪Specifications

General specifications (for detailed specifications, please see the Lithiumate™ Manual).

Electrical Specifications

Mechanical Specifications

⇪Selection

Banking

A bank can be handled in one of two ways:

• Full bank: a single cell board handles the entire bank
• Split bank: 2 or more cell boards handle the bank:
  • A positive cell board on its most positive cell
  • A negative cell board on its most negative cell
  • Zero or more mid-bank cell boards on any remaining cells

Bank	Type	Range	Cable to BMS board	Wires to adjacent cell boards
Full	Full-bank	Handles the entire bank	Through two 2-pin connectors	N.A.
Split	Positive End	Handles the post positive portion of the bank	Red and black wires through a 2-pin connector	A single wire to the next cell board
	Mid-bank	Handles a central portion of the bank	N.A.	Two single wires, one to the previous cell board, one to the next one
	Negative End	Handles the post negative portion of the bank	White and green wires through a 2-pin connector	A single wire to the previous cell board

Specifically:

• When a single cell board handles the entire bank, a "Full bank" cell board is used
• When 2 cell boards handle a bank, a "Positive end" cell board is used at the most positive end of the bank, and a "Negative end" one is used at the most negative end of the bank
• When 3 cell boards handle a bank, a "Positive end" cell board is used at the positive end, a "Mid bank" one is used in the middle, and a "Negative end" one is used at the negative end
• When n cell boards handle a bank, a "Positive end" cell board is used at the positive end, n-2 "Mid bank" ones are used in the middle, and a "Negative end" one is used at the negative end

Straight vs. Mirror

There are 4 possible orientations of the cells, based on which corner of the cell board is the '+' end. To handle all 4 cases, these cell boards come in 2 versions ("straight" or "mirror"); by a 180° rotation, these two versions can handle all 4 cases.

The arrangement is slightly different between batteries with an even or odd number of cells in series.

Even number of cells			Odd number of cells
straight '+' end at top-left corner:	mirror '+' end at top-right corner:		straight '+' end at top-left corner:	mirror '+' end at top-right corner:
mirror '+' end at bottom-left corner:	straight '+' end at bottom-right corner:		mirror '+' end at bottom-left corner:	straight '+' end at bottom-right corner:

Pitch

The pitch is:

• The spacing between alternating cell polarity
• Also the spacing between each set of cell contacts
• Also the the distance between adjacent circuits on the cell board

The pitch is determined by the arrangement of the cells:

• Matrix:
  • Square
  • Narrow hex (the front row of cells is all in one plane)
  • Wide hex (the front row of cells is staggered)
• Number of cells in parallel along the front of the battery (typically 1 or 2)
• Cell diameter (e.g.: 18 mm for an 18650 cell, 26 mm for a 26650 cell)

Pitch	Square pattern	Narrow hex pattern	Wide hex pattern
13 mm	18650 cells, 8S8P: 1 row square	18650 cells, 8S8P: 1 row narrow hex 26650 cells, 4S4P: 1/2 row narrow hex
22.5 mm			18650 cells, 8S8P: 2 rows wide hex 26650 cells, 4S4P: 1 row wide hex
26 mm	18650 cells, 8S8P: 2 rows square 26650 cells, 4S4P: 1 row square	18650 cells, 8S8P: 2 rows narrow hex 26650 cells, 4S4P: 1 row narrow hex
45 mm			18650 cells, 8S8P: 4 rows wide hex 26650 cells, 4S4P: 2 rows wide hex
52 mm	18650 cells, 8S8P: 4 rows square 26650 cells, 4S4P: 2 rows square	18650 cells, 8S8P: 4 rows narrow hex 26650 cells, 4S4P: 2 rows narrow hex

Connectors

Right angle connectors are standard on full bank and end boards. Cell boards with straight connectors or no connectors are also available

Part numbering

Part number: 1SC0422B:

• 1 = Cell Board
• SC = Small Cylindrical, top-left corner is '+' end (available: SC = top-left corner is '+' end; SM = top-left corner is '-' end)
• 04 = 4 cells in a series (available: 2 to 16 cells)
• 22 = 22.5 mm pitch. Available: 13, 22.5, 26, 45, 52
• B = full bank (available: B = full bank; M = mid-bank; P = positive end; N = negative end)

⇪Ordering

These cell boards are made to order.
There is an additional NRE charge for these cell boards, for PCB layout and manufacture set-up.

To order, please see the Lithiumate BMS ordering form.