Parallel pre-formation module composed of low-cost high-space-utilization lithium ion battery

Abstract

A parallel pre-formation module composed of a low-cost high-space-utilization lithium ion battery is characterized in that a rolled cell is arranged in an aluminum shell by means of rolling, tabs are led out of the same side of the rolled cell, the top of the aluminum shell is provided with two openings, aluminum-plastic film is welded to the openings and is provided with holes which the tabs run through, the aluminum shell is fitted with a balloon, the side of the aluminum shell is provided with a side opening which is connected with a balloon connection hole, a diaphragm includes a microporous PET (polyethylene terephthalate) thin film and a layer of multi-pore material, straight micropores arranged along the thickness are distributed in the microporous PET thin film, the layer of multi-pore material is applied to the microporous PET thin film to form double-layer stacked meshed microporous structure, and the layer of multi-pore material has a porosity of 10-90% and is less than 2 micrometers in pore size. The microporous PET thin film is 2-50 micrometers in thickness, and cells are connected in parallel through a clamp and are subjected to parallel pre-formation.

Description

technical field [0001] This patent relates to the field of lithium-ion batteries, in particular to a low-cost and high-space utilization lithium-ion battery and its parallel preformation module. Background technique [0002] 1. At present, there are mainly square, soft pack and cylindrical batteries in the battery market. Soft pack batteries are packaged with aluminum-plastic composite film. The exhaust can reduce the risk of explosion, and the aluminum shell battery adopts a fully sealed process. Under the same conditions, the air pressure is not easy to discharge, which increases the safety hazard. The manufacturing automation of aluminum shell batteries is higher than that of soft pack lithium-ion batteries. Therefore, the impact of human factors on product consistency is reduced to a certain extent, and labor costs are saved at the same time. [0003] 2. The interior of a traditional square battery includes components such as welding lugs, plastic insulators, and pres...

AI Technical Summary

Problems solved by technology

[0003] 2. The interior of the traditional square battery includes welding tabs, plastic insulators, pressure relief devices and other components occupying an internal space of 5-10mm, which limits the increase in volume specific energy

[0004] 3. The traditional extrusion exhaust method increases the workload, wastes working time, limits the fluency of battery production, and limits the increase in output; the traditional vacuum exhaust method requires high precision equipment and is difficult to operate , the operation is complex

[0005] 4. The traditional battery cell preformation method, due to the small current used, has a large difference with the actual load capacity of the charging and discharging module, and cannot fully play the role of the module

Traditional soft bag preformation using fixtures is heavy workload and inconvenient to operate

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