Lithium ion battery pole piece, electricity core and method for making same

Abstract

The invention relates to a lithium battery electrode plate. Wherein, it comprises electrode plate non-uniformly distributed with several electrode ear connecting areas; said non-uniform distribution is made by coiling electrode plate into electric core to concentrate the electrode ear connecting areas into one arc area centered at the round hole of electrode core. The invention also provides a relative production. Via said electrode ears, the battery can discharge at large current; and the electrode ears are in the arc area, to increase the space of connecting operation; and the electrode ears are connected with large space beside, to connect the polar terminal easily.

Description

technical field [0001] The present invention relates to a component of a battery and a method for manufacturing the component. Specifically, the present invention relates to a pole piece of a lithium-ion battery, a battery cell and their manufacture. Background technique [0002] With the increasing popularity of portable high-performance electric tools and smart toys, and due to the increasing requirements on weight and continuous working time of portable tools, lithium-ion batteries with high energy density and high operating voltage have stronger competitiveness. Due to the limitation of the low conductivity of the non-aqueous electrolyte, its high-rate charge and discharge performance is not good. Most of them can only continuously discharge at a current of less than 3C, and discharge instantaneously at a current of less than 10C, which cannot meet the needs of applications such as electric tools. 7C to 7C 10C continuous working discharge, 20C instantaneous high current ...

AI Technical Summary

Problems solved by technology

However, the battery manufactured by the method described in this invention patent application has the following disadvantages: ① Due to the use of multiple tabs and the multiple tabs are evenly distributed on the pole piece, after the pole piece is wound into a battery core, the tabs are distributed around the entire battery core, Figure 1 shows a top view of the distribution of tabs on the end face of the cell after the pole pieces are wound to form a cell. It can be seen from the figure that the tabs are distributed in a circle on the end face of the cell. In this way, when connecting the tabs Sometimes, the circumferentially distributed lugs form an almost closed operating space, which brings great inconvenience to the connection operation between the lugs and the connection operation between the lugs and the polarity terminals.

②The length of each tab is the same. After the pole piece is wound into a battery core, it is difficult to connect the tabs distributed on the outer pole piece of the battery core with the same polarity distributed on the inner pole piece of the battery core. Increased the difficulty of battery production

This leads to a decrease in the amount of active material attached to the pole piece, which affects the capacity of the battery, and in order to connect the tab to the pole piece, the area on the pole piece that needs to be scraped increases, which is time-consuming and laborious

Images