A kind of lug and pole piece transfer structure, battery and manufacturing method thereof

Abstract

In order to overcome the problems of energy density improvement and battery safety performance that are difficult to solve in the existing battery structure, the present invention provides a tab pole piece transfer structure, including metal tabs, metal strips and electrode pieces, the electrode piece There is an electrode collector, one end of the metal strip is attached to the surface of the electrode collector, and the other end is connected to the metal tab, the thickness of the metal strip is 10-59 μm, and the thickness of the metal tab is greater than 50 μm, and the thickness of the metal tab is greater than that of the metal strip. At the same time, the invention also discloses an electric core and a manufacturing method thereof. The tab pole piece transfer structure and the battery cell provided by the present invention can effectively reduce the thickness of the battery to increase its energy density, and at the same time have better safety performance.

Description

technical field [0001] The invention belongs to the technical field of battery structures, and in particular relates to a lug and pole piece transfer structure, a battery cell and a manufacturing method thereof. Background technique [0002] At present, in the manufacturing process of lithium-ion batteries, the improvement of the energy density of the battery cell is particularly important for the performance evaluation of the battery, especially for consumer mobile phone batteries. The thickness of the fluid, the thickness of the tabs, and the thickness of the packaging aluminum-plastic film are used to increase the thickness space, thereby increasing the energy density. [0003] Among them, by increasing the positive and negative electrode voltage matching platform and material compaction, reducing the thickness of the positive and negative electrode current collectors, and reducing the thickness of the aluminum-plastic film, a long development and verification cycle is re...

AI Technical Summary

Problems solved by technology

[0004] At present, tabs are produced on a large scale in the industry, and the thinner tabs are 0.10mm and 0.08mm. However, the thinner the tabs, the more difficult it is to quickly mass-produce and scale them up. Tin is difficult to achieve good soldering

[0005] On the other hand, with the improvement of energy density, the safety performance of the battery will further deteriorate. An existing solution is to install a safety vest structure on the battery, as shown in the patent "CN201620099936.9", by setting an additional The blank area of ​​the pole piece is wound to form a vest area to improve the safety of puncture and avoid safety problems such as burning or explosion. However, the safety vest structure includes at least one layer of aluminum foil thickness, which has a certain impact on the energy density of the battery. , in a high-voltage system with higher energy density, such as LCO 4.40V, the energy density must reach more than 720Wh / L, so the battery core designer cannot use the traditional safety vest structure

Images