Lithium prismatic battery cells

(1) lithium prismatic battery advantages

① high volume utilization, close contact, the use of square encapsulation technology in a number of battery stacking can be the maximum fit makes the space utilization rate is higher,

② unit capacity, the capacity of the square column battery is generally larger, the number of batteries required in the assembly of the battery is less, reducing the pressure on the battery management system.

③ Customized production, capacity expansion is more convenient, square batteries in the manufacturing model is not restricted to manufacture models according to user demand, while a variety of different specifications of the square battery can be more selective.

④ Smaller internal resistance, the smaller the internal resistance of a square battery with multiple lugs in the stacking process.

⑤ Simple structure, long cycle life, the design of square batteries for cylindrical batteries is relatively simple, simple design brings the benefit of relatively good stability, which makes the battery life is also longer.

⑥ high energy density, prismatic stacked batteries are internal power generation materials to make space utilization greater energy density is relatively high.

(2) lithium prismatic battery shortcomings,

① process is difficult to unify, the market in the prismatic battery specifications thousands, can not be effectively unified 

② automated production level is not high, due to the lack of technology and production specifications can not be realized prismatic battery production of efficient automation

③ the actual life is low, due to the capacity of the monomer is generally larger and higher power generation leads to the occurrence of bulging in long-term use, followed by accidents caused by the damage than the cylindrical battery. In a large number of uses in the battery close to the heat dissipation is not enough will also reduce the overall life.

Cylindrical battery cells

(1) cylindrical battery advantages of high capacity.

① mature technology, high degree of automation, low cost, cylindrical battery is the earliest use of battery packaging type, technology is more mature high yield, at the same time, due to the long history of development of the factory automation is also higher, the cost is also greatly reduced,

② heat dissipation fast, anti-vibration, cylindrical batteries assembled with gaps between the batteries condensing system can be provided to the individual batteries to provide heat dissipation, making the battery overall heat dissipation faster, the assembly of the battery is faster, and the battery is more efficient, the assembly of the battery is more efficient, and the battery is more efficient. Battery overall heat dissipation faster, assembly of batteries between each other to leave a gap to ensure that the battery pack has a certain degree of shock resistance.

③Safety, the single energy of the cylinder battery is lower, in the event of a major loss caused by the battery itself less damage, while the mature technology and high safety performance.

④a wide range of applications, cylindrical batteries in the life of a wider range of ways to use, a variety of battery equipment at home is commonly used in cylindrical batteries. In the new energy vehicles and higher requirements for the battery is not as good as the prismatic battery.

(2) the disadvantages of cylindrical batteries.

① small single capacity, cylindrical battery cells in the center of the cylinder occupies the power generation materials, while protecting the battery cells from damage

② complex assembly structure, due to the specifications of cylindrical batteries are limited cylindrical batteries need a large number of batteries in the assembly of the battery pack.

Lithium cylindrical battery cells and cylindrical battery cells difference.

(1) size： prismatic batteries are generally larger than the cylindrical volume, the size of the square battery can be customized, cylindrical battery has a fixed model such as 18650, 32700, etc.

(2) Energy density： prismatic batteries have greater energy density than cylindrical batteries, and prismatic batteries have more space for material utilization.

(3) Lifespan： prismatic batteries due to the process is not as mature as cylindrical batteries, prismatic batteries within the power generation strength is stronger than cylindrical batteries, prismatic battery shape design is also prismatic batteries lower life expectancy.

(4) Thermal management: prismatic batteries have more surface area ratio than cylindrical batteries, so prismatic batteries have more independent heat dissipation power, prismatic batteries have stronger thermal management.

(5) Internal resistance: prismatic batteries have multiple lugs inside than cylindrical batteries.

(6) Cost: the high automation and more mature technology of cylindrical batteries make the cost of cylindrical batteries lower.

(7) lug welding: cylindrical battery lug welding with simple, square battery lug welding is easy to weld game battery quality.

(8) Discharge platform: prismatic battery discharge platform is higher than cylindrical battery.

(9) assembly: cylindrical battery assembly structure is complex cylindrical battery assembly pure in the gap, so in the system heat dissipation cylindrical battery heat dissipation ability is stronger.