Lithium metal battery

Abstract

The invention provides a metal lithium battery, which includes a battery cell, a positive pole tab and a negative pole tab. The cell includes: a positive pole piece, including a positive current collector and a positive active material layer disposed on the surface of the positive current collector; a negative pole piece, made of metal lithium thin film; and a separator, located between the positive pole piece and the negative pole piece ; Wherein, the positive electrode sheet, the separator, the negative electrode sheet are sequentially laminated, wound, or laminated and wound to form a battery core, and the sequentially laminated or wound positive electrode sheet, separator, and negative electrode sheet They are in close contact with each other without gaps. The positive tab is located on one side of the battery cell and is electrically connected to the positive current collector of the positive pole piece. The negative tab is located on one side of the battery cell, integrally formed by the negative pole piece and protruding from the negative pole piece. Wherein, the metal lithium battery further includes: an electronically insulating coating covering the side of the positive electrode tab where the negative electrode tab is located, so as to electrically insulate the negative electrode tab from the side of the positive electrode tab.

Description

technical field [0001] The invention relates to the field of energy storage devices, in particular to a metal lithium battery. Background technique [0002] The metal lithium secondary battery using lithium metal as the negative electrode is a main direction for the development of high energy density lithium secondary batteries. Since metal lithium is soft and has extremely poor film strength, it is easy to deform, break and break, so the tab extraction operation using a single metal lithium negative electrode needs to be very careful. On the one hand, the negative electrode tab is easy to fall off or disconnect from the metal lithium sheet when it is shaken or dropped; on the other hand, the metal lithium tab is easily deformed and short-circuited with the positive electrode sheet when it is squeezed or impacted. Therefore, how to prevent the short circuit between the lithium metal negative electrode tab and the positive electrode and how to prevent the negative electrode ...

AI Technical Summary

Problems solved by technology

However, in the process of assembling the battery first and then processing the lithium metal tab, to ensure good electrical connection, it will inevitably face the problem that the lithium metal negative electrode or the negative electrode tab is easily contacted with the positive pole piece.

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