Winding process of battery cell
A winding process and battery cell technology, which is applied to secondary batteries, circuits, electrical components, etc., can solve problems such as cell expansion and deformation, achieve the effects of reducing production costs, simple operation, and improving safety performance and product quality
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Embodiment 1
[0030] Such as figure 1 As shown, a winding process of a battery cell 1 includes the following steps:
[0031] Step 1), setting the pole piece and diaphragm to be wound on the winding device;
[0032] Step 2), wind the pole piece and separator on the winding device to form the battery core 1; when the battery core 1 is wound to the N / 2th layer, insert one of the two narrow sides of the layer. Support rod 3, then continue to wind until it reaches N layers and stop winding; wherein, N / 2 is an integer, and N>1; the rotating speed of square needle 2 is 60r / min, and the thickness is 3mm; Rod 3 is a metal support rod with a diameter of 3mm;
[0033] Step 3) After the winding is completed, the square winding needle 2 and the support rod 3 are pulled out together to separate from the battery core 1, and the winding is completed.
Embodiment 2
[0035] The difference from Example 1 is that in step 2), when N≧30 layers, multiple support rods 3 are inserted every N / 3 layers; wherein, N / 3 is an integer. Since the number of winding layers of the battery core 1 is more, the expansion coefficient of the battery core 1 is larger, and the required reserved expansion space is more; compared with Example 1, through the above settings, the battery core 1 is avoided due to winding. The problem of expansion and deformation of the battery cell 1 caused by too many layers improves the safety performance and product quality of the battery cell 1 .
[0036] Others are the same as in Embodiment 1, and will not be repeated here.
Embodiment 3
[0038] Such as figure 2 As shown, the difference from Example 1 is that in step 2), when the battery core 1 is wound to the N / 2th layer, two support rods 3 are respectively inserted into the two wide surfaces of this layer. Since the electric core 1 of the present invention is wound by a square winding needle 2, the obtained electric core 1 is a square electric core 1, so the wide surface area of the electric core 1 is much larger than the narrow surface area of the electric core 1; compared with the embodiment 1. Through the above settings, the expansion of the pole piece on the wide surface of the battery cell 1 is slowed down, and the reserved expansion space obtained is larger, and the effect of slowing down the expansion of the battery cell 1 is more obvious;
[0039] At the same time, because the narrow surface of the battery core 1 is the corner of the winding, the contact area between the support rod 3 and the diaphragm in Embodiment 1 is large. When the support r...
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Abstract
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