Cell module side panel welding precise positioning device, welding robot and welding method thereof

Abstract

The invention discloses a cell module side panel welding precise positioning device, a welding robot and a welding method thereof. The cell module side panel welding precise positioning device comprises a fixed tool for bonding side panels in positions to be welded of cell modules, and a leveling tool for applying pressing force on the bottom surface of each cell of the cell modules through a setof extension columns and cooperating with the fixed tool to level the bottom surfaces thereof. The device is delicate in design and simple in structure, and can effectively bond the cell modules withthe side panels through the fixed tool to lay the foundation for subsequent welding; and in addition, through cooperation between the leveling tool and the fixed tool, when the height differences of the bottom surfaces of the cells exist, the bottom surfaces of the cells are leveled to guarantee full contact of each cell with the side panels, so that the false welding problem in subsequent weldingis prevented, and the welding stability and the welding quality are guaranteed.

Description

technical field [0001] The invention relates to the field of cell module processing equipment, in particular to a precise positioning device for welding side panels of a cell module, a high-precision cell module side panel welding robot and a welding method thereof. Background technique [0002] In the production process of new energy battery packs, multiple batteries are usually assembled together and the overall structure is fixed through the side panel. At present, the most common way is to weld the side panel and the battery module by welding. [0003] During welding, when the cells are assembled together, sometimes there will be a certain height difference between the bottom of each cell, which will cause the bottom of some cells to not fully fit with the side panel, resulting in virtual welding. Poor welding stability can easily lead to welding failure. [0004] In addition, the traditional welding process is mainly based on resistance welding. In the process of resis...

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Problems solved by technology

[0003] During welding, when the cells are assembled together, there may sometimes be a certain height difference between the bottom surfaces of each cell, resulting in the incomplete fit between the bottom surface of some cells and the side panels, resulting in virtual welding. Welding stability is poor, which can easily lead to welding failure

[0004] In addition, the traditional welding process is mainly based on resistance welding. In the process of resistance welding, there are several factors that are crucial to welding quality: welding discharge voltage, welding pressure, welding needle of the welding head, in the existing welding process There is basically no detection and control

[0005] The welding voltage and welding current of the existing resistance welding machine have no feedback monitoring, and the welding head generally uses a compression spring, and the compression amount of the spring and the failure of the spring are not controlled; the welding pressure is unstable, and there is no monitoring for missing welding and wrong welding , or can only be manually inspected offline, software programming is cumbersome and inefficient

[0006] Moreover, the key factor affecting the quality of resistance welding in the process of resistance welding of cell modules is the surface quality of the welding needle, including welding wear and cleanliness. During the welding process of resistance welding, there will be an instantaneous Melting at high temperature, the molten material will stick to the welding pin, especially in the case of large-scale continuous welding, the surface of the welding pin will be slowly covered by the molten welding material, and at the same time it will be dirty. Abrasion, dirt or sticky foreign matter, resulting in poor welding, or even false welding

[0007] At the same time, in the welding process of the existing battery module, the coordinates of the input solder joints are used for welding. Since there are many solder joints on the battery module, if the coordinates are input, the programming is more complicated and error-prone

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