A method for testing the tensile force of square all-tab electric core welding
A technique of tensile testing and full tabs, which is applied in the direction of applying stable tension/pressure to test the strength of materials and the preparation of test samples, which can solve the problems of inability to accurately reflect the welding effect of electric cores.
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Embodiment 1
[0024] figure 1 It is a schematic diagram of the cutting of the square all-tab cell of the present invention, as shown in the figure: it includes the first cell 1, the second cell 2, the negative full-tab 3, the soft connection 4, the cover assembly 5, and the cutting line 6 , the center line of the battery core 6-1, and the upper edge of the tab 6-2.
[0025] Among them, the first battery cell 1 and the second battery cell 2 are square winding all-tab batteries that are wound up by stacking the positive electrode sheet, the separator, the negative electrode sheet, and the separator; the positive electrode sheet and the negative electrode sheet are equipped with full Tab; the positive electrode sheet includes a positive electrode current collector and a positive electrode material layer coated on the positive electrode current collector. The positive electrode current collector is provided with a positive electrode blank area not coated with positive electrode material on one ...
Embodiment 2
[0035] Such as image 3 Shown: During the test, use two splints to respectively clamp the negative pole lug 3 and the electrode material part on both sides of the soft connection 4, each splint is composed of an upper clamp 7 and a lower clamp 8, and then connect the two clamps of the tensile machine Clamp the two splints respectively, apply a pulling force F, and test the pulling force when the welding print between the soft connection 4 and the negative full tab 3 is pulled apart, as the maximum that the soft connection 4 and the negative full tab 3 can withstand Tension value, the greater the maximum tension value, the better the welding effect.
[0036] In the test method of this embodiment, the splint is used to clamp the tab and the electrode material at the same time, which increases the force-bearing area, and during the test process, the electrode material is directly stressed. When the electrode material is elastically deformed under force, the tension is indirectly ...
Embodiment 3
[0038] Such as Figure 4 Shown: When preparing the cell test body, use the same pole piece and diaphragm as the square full tab battery, and use the same winding method to prepare two half-cells 9, and the pole piece layer of each half-cell 9 The number of layers is half of the number of layers of square full-tab battery pole pieces; each half-cell 9 has its own tab and soft connection; weld the tabs at the ends of the same polarity of the two half-cells 9 in the same direction together, and then unfold the non-welded ends of the two half-cells 9 in opposite directions to obtain a cell test body. The tab 10 after welding, the soft connection 11 after welding are as Figure 4shown.
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