Construction And Electro Mechanical Processes Of Coinpower Batteries - Varta CoinPower CP 1654 A4 Technical Handbook

COINPOWER | GENERAL INFORMATION
1.5 Construction and electro mechanical
processes of CoinPower Batteries
The housing of the CoinPower cells consists of two
stainless steel parts. This gives the cell very high
mechanical stability during assembly in the end-product
as well as during the product's use by the customer.
Inside the cell the anode, cathode and separator are
wound to a coil. The connection of the electrodes to the
housing is made by welding from the outside to the lid
and cup. The innovative design of the housing, combined
with its foil gasket, provides for the most efficient use
of the space inside the cell for energy-storing material.
This is why the energy density of the CoinPower
batteries is one of the highest of any cell in this small
form factor.
In Li-Ion batteries such as in the CoinPower cells
Lithium Ions move from the anode to the cathode during
discharge and from the cathode to the anode when
charging. Aluminum and copper are used for the positive
and negative current collector. A liquid electrolyte
provides for the movement of Lithium Ions through
the separator.
Construction of VARTA CoinPower
FIG. 8
Negative
Electrode
Copper
negative
current
collector
Li+ and Graphene
structure
Chemical reaction in Li-Ion rechargeable battery
FIG. 9
Charge
Discharge
Positive
Electrode
Aluminum
positive
current
collector
NixMnyCozO2
layer structure
COINPOWER | 9