Full-tab lithium battery and preparation method thereof

Abstract

The embodiment of the invention provides a full-tab lithium battery and a preparation method thereof. The full-tab lithium battery comprises a battery cell and a current collecting disc; an electrodeend is formed on the battery cell and comprises a positive electrode current collector and a negative electrode current collector; the current collecting disc is provided with a first disc surface used for being connected with the end surface of the electrode end, profiling grooves are formed in the end surface of the positive electrode current collector and / or the negative electrode current collector in an extrusion mode, and conductive structures matched with the profiling grooves are formed on the first disc surface; by designing the electrode end with the tab function, the first disc surface of the current collecting disc can be directly and tightly connected with the end surface of the electrode end, and the current collecting disc conducts and transmits the current of the positive electrode and the negative electrode of the battery cell, so that the structure of the battery is greatly simplified, and the complexity of a battery manufacturing process is reduced. And moreover, full-area direct contact between the current collecting disc and the electrode end can be realized, the conduction distance of current passing through the tab is shortened, the effect of effectively reducing the internal resistance of the lithium ion battery is achieved, and the use safety of the lithium ion battery is ensured.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an all-tab lithium battery and a preparation method thereof. Background technique [0002] Lithium-ion battery is a rechargeable battery that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. Lithium-ion batteries can be divided into winding type and laminated type in terms of manufacturing process, and all include positive electrode sheets, separators and negative electrode sheets stacked in sequence. Layers are wound to form a cylindrical lithium-ion battery cell, and the positive electrode sheet, separator and negative electrode sheet can be stacked layer by layer in the same direction to form a square lithium-ion battery cell. Compared with other types of batteries such as lead-acid and nickel-cadmium, lithium-ion batteries have the advantages of large specific capacity, high operating voltage, fast charging spe...

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a full-tab lithium battery and its preparation method to solve the problems of complex manufacturing process and large internal resistance in the existing lithium-ion battery with tabs

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