Gantry-type automatic spot welding system for battery pack

Abstract

The invention provides a gantry-type automatic spot welding system for a battery pack, which comprises a spot welding device and a spot welding jig fixing device which are vertically arranged and are connected with a PLC (programmable logic controller) of the system. The spot welding device comprises a beam, a group of opposite vertical columns in parallel, a spot welding mechanism, an X-axis sliding table, a Y-axis movement mechanism and an X-axis movement mechanism, wherein the vertical columns are used for adjusting the height of the beam, the X-axis sliding table is used for fixing the spot welding mechanism, the Y-axis movement mechanism enables the spot welding mechanism to transversely move, and the X-axis movement mechanism enables the X-axis sliding table to transversely move. The spot welding jig fixing device comprises a spot welding jig platen and a clamping mechanism for clamping a spot welding jig, wherein the clamping mechanism is arranged on the spot welding jig platen and is perpendicular to the spot welding mechanism. By the aid of a gantry-type structure, clamping is performed once, cells are numerous, spot welding parameters are controllable, and the system is fast in running speed, high in spot welding efficiency, highly adaptable to the cells, accurate in positioning and fine in spot welding quality.

Description

【Technical field】 [0001] The invention relates to the technical field of automatic spot welding equipment for battery packs, in particular to a gantry-type automatic spot welding system for lithium batteries and power battery packs. 【Background technique】 [0002] The power battery pack is mainly used in electric vehicles, electric motorcycles and other fields. The battery cells used in the power battery pack are basically the same as other battery packs. The main feature is that the battery pack has a large capacity and a large number of battery cells. The difficulty is mainly It is reflected in the welding of the electric core. At present, most domestic manufacturers still adopt the traditional manual welding method. The specific operation is: 1. Pack the battery into the jig. 2. Install the nickel sheet. 3. Manual spot welding one by one. There are many defects in this mode, and it mainly shows in: 1, welding labor intensity is big and welding efficiency is low, and ve...

AI Technical Summary

Problems solved by technology

There are many defects in this method, which are mainly manifested in: 1. The welding labor intensity is high and the welding efficiency is low, and it is easy to cause worker fatigue

2. The utilization rate of special spot welding power supply (expensive) is extremely low, which leads to a great increase in the cost of the enterprise

3. Welding is unreliable and easy to weld, resulting in a high scrap rate and poor reliability of the battery pack, causing huge losses to the enterprise

4. The welding appearance is not good, and the solder joints are prone to burrs, yellowing, blackening and other phenomena

5. The welding time is uncontrollable, which may easily cause changes in the internal resistance, voltage, and capacity of the battery cell, which will affect the performance of the battery cell

6. The operation safety is poor, and the manual welding sparks are more likely to cause explosions and other phenomena, which will affect the safety of workers

7. The position of the solder joint is not accurate, and manual operation cannot guarantee the uniform position of the solder joint

The spot welding devices of the above two patents have defects such as low welding pass rate, easy false welding, deformation of the battery core, bonding of welding needles, and uneven solder joints.

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