Battery cell of semi-winding laminated lithium-ion battery and preparation method of battery cell

Abstract

The invention discloses a battery cell of a semi-winding laminated lithium-ion battery and a preparation method of the battery cell. The battery cell is composed of a battery cell housing, a flat plate core rod, a diaphragm bag, a polar electric band and electrolyte; the preparation method comprises the following steps: preparing the flat plate core rod and opening a honeycomb-shaped or grid-shaped hollow structure in the flat plate core rod; sleeving the diaphragm bag; preparing a positive pole piece with tabs and a negative pole piece with tabs by utilizing an aluminum foil and a copper foilrespectively, and coating positive and negative pole materials respectively; laminating the positive pole piece and the negative pole piece by utilizing an ion exchange diaphragm to form the polar electric band; winding on the flat plate core rod covered with the diaphragm bag; meanwhile, overlapping all positive tabs and negative tabs together respectively to form a positive pole and a negativepole, which are provided with the polar electric band; putting the battery cell into the battery cell housing; injecting the electrolyte and sealing. According to the battery cell, a semi-winding design model is adopted to generate the rotary battery cell with a semi-winding inner part and a square-structure outer part; the problems of an existing battery cell of a lithium battery that inner and outer temperature is not uniform, the service life is relatively short, the structure stability is poor, the energy consistency is poor and the like are solved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a half-wound laminated lithium-ion battery cell and a preparation method thereof. Background technique [0002] Lithium battery is the core product of the energy industry and an indispensable factor for dispatching energy. The core unit that constitutes a lithium battery is the lithium battery cell, so the production and preparation of the cell determines the success or failure of the lithium battery industry. [0003] At present, the production methods of lithium battery cells are mainly divided into winding process and lamination process. These two processes have their own advantages and disadvantages. Among them, the winding process has the advantages of high output, high degree of automation, and high production efficiency. It is also the most mature cell preparation process so far. Therefore, in the process of practical application, lithium battery ce...

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Problems solved by technology

[0005] Aiming at the defects in the above-mentioned prior art, the present invention provides an intermediate state lithium battery cell between the winding type and the laminated type and its preparation method, thereby simultaneously solving the problems caused by the above two process routes. application defect

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