Prismatic design

Leclanche s cells are produced in cylindrical and flat (prismatic) designs in different sizes. Their energy density at 20 °C is very low (65 Wh kg-1 for the cylindrical size, see Table 2) compared to the other primary battery technologies. Fiowever, they are the cheapest batteries available in the market (see Table 2). Their nominal voltage is 1.5 V, which is comparable with other battery technologies (see Table 2). 

The cell manufacturer is GS-Yuasa Technology (formerly Japan Storage Battery) and its technology is based on cobalt systems within an elliptic-prismatic design. Cell capacity can be selected from 50, 100, 175 Ah and 200 Ah. 

These cells are produced in cylindrical bobbin and spiral-wound designs as well as disc types. Large prismatic designs have also been produced in the past. These designs employ porous carbon cathodes with a nickel or stainless-steel current collector, a lithium anode, and a highly porous... 

Nickel/Cadmium 1.2 40 80 Accumulator button, cylindric, and prismatic designs... 

Small portable maintenance-free valve-regulated lead-acid batteries (VRLA) with immobilized electrolyte are available as well in cylindrical as in prismatic design. 

Li/(CF), 2.8 Highest theoretical specific energy, low- to moderate-rate capability wide operating temperature range (—20 to 60°C) flat discharge profile available in flat (coin), cylindrical and prismatic designs. 

Major battery Prismatic cells Based on Based on Sealed cylindrical Prismatic cells Prismatic cells Button cells to Prismatic designs... 

Both metal and plastic cell cases are common for the prismatic NiMH batteries used in automotive applications such as electric vehicles. Unlike cylindrical cells where the can itself is the negative terminal, prismatic design ceUs have both a positive and negative terminal at the top cover plate. Key criteria for selecting metal cell cases include excellent thermal conductivity, inexpensive prototyping costs for changing ceU dimensions, and small volumetric penalties. 

As illustrated in Table 35.12 and Table 35.13, Li-ion batteries are available in a wide range of sizes from 0.6 to 160 Ah in both cylindrical and prismatic designs with a range of aspect ratios. Li-ion battery performance has steadily improved, in the period 1996 to 1999, the specific energy of 18650-type cells increased 8% per year while energy density increased 14% per year, on average. 

These cells are available in small prismatic and cylindrical cell designs with capacities up to 1 Ah and in flat, cylindrical and prismatic designs with capacities up to 20000Ah. Twenty year reserve cells are also available. 

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