Analysis of Lithium Ion Battery Module

Lithium-ion battery modules can be understood as the intermediate products of batteries and packs formed by combining lithium-ion batteries in series and parallel with the addition of single battery monitoring and management devices. Its structure must support, fix and protect the cell, which can be summarized into three major items: mechanical strength, electrical performance, thermal performance and fault handling capability.

Whether it is possible to fix the position of the battery cell and protect it from deformation that degrades its performance, how to meet the current-carrying performance requirements, how to meet the control of the cell temperature, whether it can be powered off in case of serious abnormalities, and whether it can prevent thermal runaway Communication, etc., will all be the criteria for judging the pros and cons of lithium-ion battery modules. For lithium-ion battery modules with high performance requirements, the thermal management solutions have shifted to liquid cooling or phase change materials.

Lithium-ion battery packs have a lot of internal connecting wires, and there are too many manual welding steps, which can cause welding and assembly problems; too many parts and components cause assembly difficulties, high failure rates, and high costs.

Lithium-ion battery module design and processing process

The entire lithium-ion battery module design process actually includes the goals you want to design the entire module, integrate the details of the module design, and have a complete verification process for the module design, including structure, electrical, and cooling safety. Part of it must be implemented in it.

The first part is divided into several design levels

Satisfying the needs of the vehicle-equivalent product is mainly divided into structure, electrical design, thermal design, and safety. According to the requirements of the battery, sufficient compression force is given. This compression will also be discussed later. The entire battery, whether it is a soft case or a hard case , Through a certain amount of addition, the expansion of the battery core can be effectively prevented, and a certain amount of support is provided in the life.

There is also a fixing between the module and the tray in the whole lithium-ion battery pack, and the module can be effectively fixed to the tray through the pressing bar. The most important thing above is the sampling line inside, as well as to prevent the cell from moving inside. The whole cell is not serious in terms of heating under normal NETT conditions. We must also consider that there may be some extreme situations, that is, the user It may be at a high speed, which is equivalent to saying that the long-distance driving enters the fast charging state, and the continuous limit is met, and there may be a strong heat transfer requirement here. There is a strong connection between safety and the thermal insulation requirements of the cell in the module design.

The second part, the manufacturing process

The most important thing is to change the battery cell from single unit to stacking to welding, sampling line layout, CMU layout, the entire process, equipment, related distance, process assembly are required, this part must be related to the equipment, especially when moving, Especially when it comes to automated production lines, there is a strong demand connection here.

The third part, maintenance considerations

Because when we are doing it now, the first step at the beginning is to make the product. Later, as the vehicle is used, the entire lithium-ion battery module is repaired, especially the damage of the relevant sub-components, how is the module? Repair, here must be combined with the manufacturing process and repair process, and there is relatively little talk about it here.

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