Pressurizing system for lithium ion battery pole group

Abstract

The invention provides a pressurizing system for a lithium ion battery pole group. The pressurizing system can uniformly press the lithium ion battery pole group with uneven thickness. The pressurizing system comprises a flexible packaging bag, a vacuum sealing device and an isostatic pressing device, wherein the flexible packaging bag is used for packaging a lithium ion battery pole group; the vacuum sealing device is used for performing vacuum pumping on the flexible packaging bag in which the lithium ion battery pole group is packaged and then sealing the flexible packaging bag; and the isostatic pressing device comprises a pressure container, a heater arranged on the pressure container and a pressure medium accommodated in the pressure container, and the lithium ion battery pole group packaged in the flexible packaging bag is pressurized through the pressure medium.

Description

technical field [0001] The invention relates to a pressurization system of a lithium ion battery pole group. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, many cycle times, and long storage time. They are not only widely used in portable electronic devices such as mobile phones, digital cameras and laptop computers, but also widely used in electric vehicles, electric Large and medium-sized electric equipment such as bicycles and electric tools. In addition, as a mature lithium-ion battery product, it has been widely used in electronic products and power energy industries. [0003] Currently, when producing a prismatic lithium-ion battery, it is necessary to hot press the electrode group of the prismatic lithium-ion battery. In the prior art, two iron plates are used to directly press the pole group. Since the thickness of each point on the pole group is different during the preparation process of the pole gro...

AI Technical Summary

Problems solved by technology

In the prior art, two iron plates are used to directly press the pole group. Since the thickness of each point on the pole group is different during the preparation process of the pole group, when the iron plate directly presses the pole group, the pole group The thick part bears all the pressure, but the thin part of the pole group is not under pressure, so the hot pressing effect on the pole group is poor, and it is easy to crush the pole group. In addition, in the later stage of battery preparation, the pole pieces inside the pole group are It will produce serious consequences such as lithium precipitation, which will affect the battery capacity and cycle performance of the battery, and seriously affect the safety performance of the battery.

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