Collecting structure of battery and battery

Abstract

The invention provides a current collecting structure of a battery, the battery comprises a battery cell, the current collecting structure comprises a current collecting disc and a current collecting column, one end face of the current collecting disc is welded with one electrode end face of the battery cell, and the other end face of the current collecting disc is welded with the current collecting column; and the current collecting column comprises a welding disc and an annular boss formed on the welding disc, a through hole matched with the annular boss is formed in the current collecting disc, the protruding height of the annular boss is the same as the depth of the through hole, and the annular boss is welded and fixed to the current collecting disc at the position of the through hole. According to the current collecting structure, the contact area between the current collecting disc and the current collecting column is increased, and the girth welding is carried out in a seam welding manner, so that large current can pass through the current collecting structure, the rate capability of the battery is improved, the space is saved, more electric quantity can be stored in the same space, and the energy density is relatively high. When a large current passes through the current collecting structure provided by the invention, the conduction rate of the current is high, the resistance is low, and the heating rate is small.

Description

technical field [0001] The invention relates to the technical field of lithium battery design and production, in particular to a battery current collecting structure and the battery. Background technique [0002] Lithium batteries stand out among many types of batteries due to their advantages of high energy density, high voltage, high rate performance and long life. According to the packaging type, lithium batteries are generally divided into cylindrical lithium batteries, square lithium batteries and soft-pack lithium batteries. , Cylindrical lithium batteries have been widely used due to their high product yield and high capacity. The improvement of high-current charge-discharge performance has always been a hot topic in the research of cylindrical lithium batteries, and the design of the current collection method has a non-negligible impact on the realization of high-current charge-discharge performance. [0003] The traditional current collection method includes the us...

AI Technical Summary

Problems solved by technology

[0003] The traditional current collection method includes the use of single or multiple tabs connected to the pole as the current collection method, which has low current conduction capacity, high internal resistance, uneven current distribution during charging and discharging, and it is difficult to achieve high current. Discharge

As a further improvement, current collectors are introduced into the end faces of the electrodes, and the current collectors are connected to the poles through welded or integrally connected bendable metal sheets. This method has a larger diversion area. However, there are still disadvantages such as the internal space of the battery is occupied by the metal sheet being bent, resulting in an increase in the internal resistance of the battery and a decrease in energy density.

In addition, due to the disadvantage of large internal resistance in the design of the current collection method, it is easy to cause the metal sheet to burn out during high-current charging and discharging, resulting in battery failure and even safety accidents.

Images