Cylindrical battery cell adopting non-welding conductive connection and preparation method thereof

Abstract

The invention relates to a cylindrical cell adopting non-welding conductive connection, which comprises an upper cover, a shell, a roll core and a conductive adhesive, the roll core accommodated in the shell is formed by winding a negative plate, a positive plate, a first diaphragm and a second diaphragm, the negative electrode leakage current collector of which the positive electrode plate is exposed out of the adjacent diaphragm is positioned at the one end of the roll core, the negative electrode leakage current collector is electrically connected with the adjacent bottom of the shell or the contact surface of the pole through a conductive adhesive, the positive electrode leakage current collector of which the positive electrode plate is exposed out of the adjacent diaphragm is positioned at the other end of the roll core, and the positive electrode leakage current collector is electrically connected with the adjacent contact surface of the pole or the bottom of the shell through a conductive adhesive; and the conductive adhesive is composed of an electric conductor and a bonding body which are located on the same layer. The invention also relates to a preparation method of the cylindrical battery cell adopting non-welding conductive connection. The method has the advantages that the safety performance of the battery cell is improved on the premise of not influencing the energy density of the battery cell, the low-voltage defect of the battery cell is improved, the manufacturing procedures are reduced, the equipment purchase and maintenance cost is reduced, and cost reduction and efficiency improvement are realized.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a cylindrical electric core adopting non-welding conductive connection and a preparation method thereof. Background technique [0002] Traditional small cylindrical cells, new large cylindrical cells and large cylindrical cells with full lugs rubbed flat. Provide a current path, and the welding methods include resistance welding, ultrasonic welding and laser welding; among them, resistance welding is suitable for welding of many types of same or dissimilar metals, the process is simple, the heating time is short, and the welding deformation is small, but the equipment is expensive. The tensile strength and fatigue strength of the welding place are low, the needles are changed frequently, the welding area is limited by the space, and welding spatter and sparking may cause safety hazards such as short circuit of the battery cell; ultrasonic welding has good conductivi...

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Problems solved by technology

[0002] Traditional small cylindrical cells, new large cylindrical cells and large cylindrical cells with full lugs rubbed flat. Provide a current path, and the welding methods include resistance welding, ultrasonic welding and laser welding; among them, resistance welding is suitable for welding of many types of same or dissimilar metals, the process is simple, the heating time is short, and the welding deformation is small, but the equipment is expensive. The tensile strength and fatigue strength of the welding place are low, the needles are changed frequently, the welding area is limited by the space, and welding spatter and sparking may cause safety hazards such as short circuit of the battery cell; ultrasonic welding has good conductivity and low resistivity, which is good for welding metal The surface requirements are also low, and flux and gas protection are not required, but mechanical vibration produces a large amount of metal dust, which is difficult to clean from the battery. The relatively long welding time affects the cycle time, and it is prone to false welding, over-welding and soldering. The crack is abnormal, and the welding head is not easy to do; laser welding is to use the heat generated by the laser to melt the metal materials and fuse them together. After cooling, the grains are regenerated to connect the two workpieces. The speed is fast, the depth is large, and the deformation is small. Long-distance welding has high flexibility, but the energy conversion efficiency of laser welding is low, shielding gas is required, high assembly precision is required, welding temperature rises and welding slag splashes, and there is a risk of welding through when the tab is welded to the shell, which affects Battery sealing; therefore, the present invention develops a cylindrical battery using non-welding conductive connection and its preparation method, so that it can improve the safety performance of the battery and improve the low-voltage failure of the battery without affecting the energy density of the battery. It is very necessary to reduce the production process, reduce the cost of equipment procurement and maintenance, and achieve cost reduction and efficiency increase

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