BYD Blade Battery and GCTP Technology -Lithium - Ion Battery Equipment

BYD Blade Battery and GCTP Technology -Lithium - Ion Battery Equipment

BYD's blade battery is the long cell method (importantly refers to the square aluminum shell), which is a method to further improve the battery pack by increasing the length of the cell (the maximum length is equal to the width of the battery pack) and making the cell flat and elongated. Technology for integrated efficiency. It is not a cell of a specific size, but a series of cells of different sizes that can be formed based on different needs. The specific shapes are as follows:

The positive and negative electrodes are at both ends, and there are explosion-proof valves at both ends (or one end), which is a bit of a combination of soft-packed tabs at both ends + square aluminum shell. Related to the existing square aluminum shell cell method, the most obvious advantage of this cell is that the heat dissipation effect is good. The difficulty lies in the structural stability, internal resistance, liquid injection, etc. of the entire cell, especially in terms of structural strength. In the method, the cell has to rely on itself to achieve support.(Lithium - Ion Battery Equipment)

In this regard, it is important for BYD to improve the support strength of the casing through improvements in the molding process and structural design, and at the same time control the length-to-width ratio of the casing within a predetermined range. In addition, the internal resistance of the single cell can be reduced by optimizing the current collecting path, and it can also be supplemented by the improvement of the liquid injection process to solve the problem of long liquid injection time caused by the long size of the single cell.

There is no clear information about specific energy, nor is it disclosed in the patent. However, according to a speech made by BYD yesterday, an overall specific energy trend can be roughly inferred.

Next, let's focus on BYD's CTP method from the patent.

(1) Structurally, the following figure is a composition explosion diagram of a CTP method.

It can be seen that the single row of cells is directly laid on the bottom plate, and the two ends of the cell are fixed on the end plate, and the frames at both ends supply the support for the cell. In order to increase the supporting force, a new one can be added to the bottom plate. Support steps; there is a buffer plate (side plate) between the frame of the battery pack and the large surface of the cell to supply clamping force to the cell. There are no longitudinal beams in this method, and you can also add longitudinal beams or flame-retardant insulation pads, which form multiple sub-modules, as follows:

BYD seems to be planning to use the strength of the cells to achieve self-support, and at the same time rely on the strength of the integrated cells to increase the structural strength of the entire battery pack, that is, the cells and the box are tightly integrated into one. This is subject to the final product inspection, and the strength of the cell casing is very high.




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