Wound-stacked battery

Abstract

The invention discloses a wound-stacked battery which comprises a cell. The cell is formed by stacking wound structural units, each wound structural unit comprises a horizontally-arranged diaphragm, an anode piece and a cathode piece, each anode piece and the corresponding cathode piece are spaced by the corresponding diaphragm and integrally wound to form the corresponding wound structural unit, and number of winding turns is 0.5*N, wherein N is a positive integer; each formed wound structural unit is any interceptible part of a unit with cathode / diaphragm / anode / diaphragm / cathode / diaphragm / anode / diaphragm / cathode / diaphragm / anode / diaphragm / cathode alternately repeated, multiple wound structural units are stacked to form a battery pole group, each anode piece and the corresponding cathode piece are arranged on two sides separated by the corresponding diaphragm in the battery pole group to form a battery pair, the outermost layer of the battery pole group is one diaphragm, and the second outermost layer is one cathode piece. The wound-stacked battery has the advantages of being free of circular-arc area, saving of raw materials, low in loss, uniform in circulation and expansion, high in preparation efficiency, uniform in electrolyte distribution and high in structural stability.

Description

technical field [0001] The invention relates to a battery, in particular to a winding-stacked battery. Background technique [0002] Nowadays, the use of lithium-ion batteries in power tools is growing explosively, and the cost, production efficiency, long-term life and consistency of power batteries are in urgent need of rapid breakthroughs, so the research on the structure of battery components is the top priority. The current structure of battery components includes winding type, laminated type, bag-making type, stacking-folding type and other structures: the winding type structure is to separate the continuous positive electrode sheet and negative electrode sheet through the separation film; In the type structure, specific structural units are stacked continuously and separated by a separation membrane; the bag-making structure is a structure in which the negative electrode is first bagged in a separator bag, and then stacked layer by layer; stacking-folding In the form...

AI Technical Summary

Problems solved by technology

[0003] The winding type, laminated type, bag-making type, and stacked-folded battery structure have the following advantages and disadvantages: (1) The winding type structure is manufactured by densely winding long-sheet negative electrodes and long-sheet positive electrodes. formula structure, as a result, the battery structure is circular or elliptical in cross-section, the stress due to the expansion and contraction of the electrodes during charging and discharging of the battery is accumulated in the battery structure, and when the stress accumulation exceeds a certain limit, the battery structure will Deformation, the deformation of the battery structure leads to uneven gaps between the electrodes, the cycle performance of the battery will deteriorate sharply, and the safety of the battery cannot be guaranteed due to the short circuit inside the battery; (2) the laminated structure passes through sequentially Stacking multiple unit negative electrodes and multiple unit positive electrodes to manufacture a stacked battery structure requires a lot of time and effort to perform sequential stacking processes, resulting in low production efficiency in this process; (3) bag-making structure, compared to lamination (4) The stacking-folding structure has high production efficiency and stable structure, but the difference between electrolyte layers will affect the long-term characteristics of the battery

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