Narrow type lithium-ion battery and manufacturing process thereof

Abstract

The invention discloses a narrow type lithium-ion battery, comprising positive and negative pole pieces, a diaphragm, electrolyte, positive and negative lugs, insulation bonding films, and a shell; the positive lug and the negative lug passes through a same insulation binding film and extrude into a battery cell; one end of the positive pole piece and one end of the negative pole piece are in a L-shaped, and the projecting parts of the L-shaped ends are blank current carrier. A manufacturing process for manufacturing a narrow type lithium-ion battery comprising the following steps: (1) producing pole pieces; (2) not processing one end of each pole piece into L-shaped; (3) communicating the pole pieces with the diaphragm and winding vertically; (4) welding the lugs on the projecting parts of the L-shaped ends; (5) encapsulating and injecting the electrolyte solution, forming, and then completing the manufacturing of the lithium-ion battery. In the invention, the design of the L-shaped ends of the pole pieces and the integral type lugs is matched with the vertical winding way of the battery cell to ensure that the width of lithium-ion battery can be made smaller, so that the application scope is broader.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a miniature lithium ion battery and a manufacturing process for manufacturing the narrow lithium ion battery. Background technique [0002] Such as Figures 1 to 3 As shown, at present, the width of polymer lithium-ion batteries is generally above 10.0mm due to the influence of factors such as winding method, needle width, tab width, and welding technology. [0003] Winding method, winding needle width: Lithium-ion battery winding usually adopts horizontal winding technology, that is, the width of the pole piece corresponds to the length of the battery, and the width of the rolled cylindrical battery cell after flattening corresponds to the width of the battery , the width of the winding needle corresponds to the width of the battery. First, the tabs are welded to the pole pieces and wound horizontally. Each battery contains a positive electrode and a negative electrode. Among them, the...

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Problems solved by technology

Among them, the mechanical strength requirements of the rolling needle are high, and the circumference of the rolling needle is usually greater than 10mm, so the width of the battery cell processed in this way is difficult to be less than 10mm

In addition, there is a lamination forming process. The pole pieces are punched and formed according to the size of the battery. Each battery will have many pieces of positive and negative electrodes. The plates are welded in parallel, and all the negative plates are welded in parallel. Theoretically, the width of the battery can be less than 10mm, but the production efficiency of this technology is low, and the investment in equipment is large. Therefore, the lamination technology is usually only used for the production of batteries with a width greater than 20mm.

[0004] Tab width limit: the width of the single tab metal strip is usually more than 2mm, and the total width of the insulating adhesive film of PP material on the metal strip must be more than 4mm. A distance of more than 2mm must be kept between them, so it is difficult for the total width of the battery to be less than 10mm

[0005] The battery produced by the above battery technology is either difficult to miniaturize the battery width, or has high cost and low efficiency, which greatly limits the application range of polymer lithium battery

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