Lithium ion battery core and preparation method thereof, and lithium ion battery

A technology of lithium-ion batteries and batteries, which is applied in the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc. It can solve problems such as poor bonding and diaphragm clogging, and achieve improved bonding and enhanced bonding effects Effect
CN108390101AActive Publication Date: 2018-08-10DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
Publication Date
2018-08-10

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Abstract

The invention relates to a lithium ion battery core and a preparation method thereof, and a lithium ion battery. The preparation method comprises: assembling a positive electrode sheet, a negative electrode sheet and a separation membrane, and carrying out hot pressing at least twice to prepare the battery core, wherein the separation membrane comprises a base membrane and a polymer bonding substance coated on the base membrane. According to the present invention, the lithium ion battery core is prepared through the multiple hot pressing, wherein the first hot pressing provides the pre-pressing effect so as to achieve the primary bonding of the separation membrane and the electrode sheet and expose the gap at the bonding interface position, and the second hot pressing provides the supplementing effect, such that the polymer bonding substance can fully fill the gap generated by the pre-pressing, and the bonding effect of the bonding interface can be enhanced; and with the at least two hot pressing, the bonding effect at the bonding interface can be improved in a targeted manner, and the clogging of the separation membrane due to the infiltrating of the molten polymer bonding substance into the pores of the separation membrane can be avoided.
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Description

technical field

[0001] The invention belongs to the field of lithium-ion battery preparation, and in particular relates to a lithium-ion battery cell, a preparation method thereof, and a lithium-ion battery. Background technique

[0002] Lithium-ion batteries, as a clean new energy source, have been more and more widely used in mobile phones, power vehicles and other fields. Lithium-ion batteries generally include a packaging case and a battery cell contained in the packaging case. The battery cell includes a positive electrode sheet, a negative electrode sheet, and a separator spaced between the positive electrode sheet and the negative electrode sheet. The separator is an ion-conducting, electronically insulating porous membrane that acts as a separator between the positive and negative electrodes.

[0003] At present, the separators used in conventional lithium-ion batteries are polypropylene porous membranes, polyethylene porous membranes or polypropylene / polyethylene / p...

Claims

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