Tab laser welding structure of lithium ion battery

Abstract

Belonging to the technical filed of lithium ion battery tab connection, the invention provides a laser welding structure. The structure comprises the following parts: end clamping plates, battery frames, square aluminum strips, collection mounting plates, tab connection plates, and tab runoff plates and polar columns, etc. The structure can realize series-parallel connection of lithium ion battery tabs and bunching connection of batteries. Compared with the previous mode of tab connection by bolt locking, the structure provided by the invention has the advantages of higher reliability, convenient assembly, high efficiency, smaller connection internal resistance, better stability and firmer connection, also can effectively prevent battery looseness during composing a battery module, and can tolerate vibration and shock of road vehicles and other circumstances.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery combination and a battery pack. The structure is suitable for the assembly of lithium-ion batteries with aluminum-plastic film casings, and is also suitable for the assembly of other power batteries. Background technique [0002] With the increasingly serious energy and environmental problems, driven by industrial policies and markets such as energy conservation and emission reduction, green credit, and green securities, electric vehicles are gradually attracting the attention of the society and the government, and electric vehicles will also become the future of the automotive industry. A big branch. One of the core technologies of electric vehicles is the battery system. The grouping technology of the battery is the key technology to determine whether the system is available. [0003] Considering the existing battery technology ...

AI Technical Summary

Problems solved by technology

[0004] However, at present, the tabs of lithium-ion batteries are basically connected by locking bolts. Such a cumbersome process not only wastes a lot of manpower and material resources, but also has a large connection internal resistance, and the material of the tab connection plate is also very single, basically It is connected by copper plate, because the weight of the lithium battery itself has always been an urgent problem to be solved, and the use of a few millimeters thick copper plate and bolt connection will increase the weight of the entire battery system

[0005] Due to the complex driving conditions of new energy vehicles, and frequent vibration and impact phenomena, the service life of the vehicle must be more than 5 years, so the requirements for the vibration resistance and impact resistance of the battery system are relatively high. This invention focuses on the research of the battery in the battery system. The tab laser welding structure solves the problem that the battery is easy to loose due to the loosening of the bolts during the operation of the vehicle

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