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Nt1310 Lab 5-1

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There are different kinds of batteries in the market currently, such as coin cells, cylinder cell, prismatic cell and pouch cell. They all have different geometries, but in this chapter we will only focus on pouch battery. The following Fig.5-1 shows the structure of the pouch battery that we used in this study. Fig.5- 1 Three visions of the lithium-ion battery structure. a) One slice of the whole pouch cell. b) The whole battery includes 110 slices. The lithium-ion battery geometry is shown in Fig.5-1. As we can see, it’s a prismatic pouch cell. Fig.5-1 a) shows only one slices of the whole pouch cell. Fig.5-1 b) is the entire cell which contain 110 single layers. The designed capacity of the cell is 5 Ah. Fig.5-1 c) is the front side vision of the battery. The width and the high of both the positive and the negative tabs are equal. The …show more content…

Although the penetration depths for different situations are not the same, but the model structure and the position of the nail didn’t change. Thus, here we used the 100% penetration model to represent all other penetration situations. The parameters shown in Fig.5-2 are described in table 5-2. Fig.5- 2 The geometry nail penetration model in all-through case. b) The front side vision of the battery. Compared with the nail penetration model, the internal short-circuit model is a little bit similar. The geometry structure is shown in Fig.5-3. Instead of a stainless steel nail, there is a hot point inside the pouch cell at four different position, top left, top right, bottom right and in the center. The distance between the hot points and the battery boundary is the same for the top left, top right and bottom right hot points. Here we take the bottom right model as an example. Fig.5- 3 The geometry of the internal short-circuit model. a) The perspective vision of the battery. b) The front side

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