Lithium polymer battery，There is a big gap in design choices among different countries. The Chinese formula in the figure above is a typical form. Its basic components include: module control (commonly known as BMS slave board), battery cell, conductive connector, plastic frame, cold plate, cooling pipe, pressing plates at both ends and a set of fasteners to combine these components. The pressing plates at both ends not only gather the single cell and provide a certain pressure, but also design the fixed structure of the module in the pack.
Structural design
Structural design requirements. Reliable structure: earthquake resistance, dynamic fatigue resistance; Controllable process: no over welding and false welding to ensure 100% no damage to the cell; Low cost: the automation cost of pack production line is low, including production equipment and production loss; Easy disassembly: the battery pack is easy to maintain and repair, low cost, and the battery cell can be used step by step; The necessary heat transfer isolation shall be achieved to avoid the rapid spread of heat out of control. This step can also be considered in the package design.
It is understood that, at present, the die group efficiency of cylindrical core in the industry is about 87%, and the system group efficiency is about 65%; The group efficiency of soft core mold is about 85%, and the group efficiency of system is about 60%; The modular efficiency of square cell is about 89%, and the system efficiency is about 70%. The single energy density of soft core has higher promotion space than that of cylinder and square, but it has higher requirements for module design and is difficult to control the safety, which need to be solved by structural design.
General module optimization approach. Improving space utilization is also an important way to optimize the module. Power battery pack enterprises can reduce the cell spacing by improving the design of modules and thermal management system, so as to improve the utilization of space in the battery box. Another solution is to use new materials. For example, the bus bar in the power battery system (the bus in the parallel circuit is generally made of copper plate) is replaced by aluminum, and the module fixing parts are replaced by sheet metal materials with high-strength steel and aluminum, which can also reduce the weight of the power battery.
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