Single battery with super capacity and preparation method thereof

Abstract

The invention provides a single battery with super capacity and a preparation method thereof. The battery comprises a battery housing and several battery electrode groups; cathodes of the battery electrode groups are connected by a first conductive material in parallel connection, anodes are connected by a second conductive material in parallel connection, and several battery electrode groups arearranged in the battery housing; outside of the battery housing is provided with several positive electrode columns and negative electrode columns, the positive electrode columns and the negative electrode columns pass the battery housing, the bottom parts of the positive electrode columns are connected with the first conductive material, the bottom parts of the negative electrode columns are connected with the second conductive material, and the battery housing is filled with electrolyte. The preparation method comprises the following steps: battery electrode columns are manufactured; the cathodes, the anodes and the conductive materials of battery electrode groups are connected; the battery electrode groups are installed in the battery housing, and the positive electrode columns and thenegative electrode columns are assembled; electrolyte is injected in the battery housing, and formation is carried out. Welding and assembling technology difficulty of the single battery with super capacity is low, production efficiency is high, stability of production technology is high, heat radiation efficiency is high, operational reliability of the battery is high, and usage life of the battery is long.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a super-large-capacity single battery and a preparation method thereof. Background technique [0002] Compared with cadmium-nickel, lead-acid and other system batteries, lithium-ion batteries have the advantages of high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating temperature range. Currently, they are mainly used in power and energy storage. And several major fields of consumption. With the continuous expansion of the scope of use of lithium-ion batteries, it has been widely used in the field of vehicle and ship power. With the continuous improvement of battery life, there is a higher demand for the battery energy density of energy storage batteries, requiring lithium-ion batteries not only to have a larger capacity, but also to have a high energy density. Traditional power and energy storage bat...

AI Technical Summary

Problems solved by technology

[0003] The main difficulties that limit the further improvement of battery capacity are: the number of battery pole pieces is large; the electrical connection between the pole group and the pole is difficult, and the riveting process is often used. When the riveting point is electrically connected to the pole, the voltage drop is too large, which affects the power output characteristics of the battery.

In addition, due to the large battery capacity and the large thickness of the electrode group, it is easy to cause a large temperature gradient in the middle and outside of the electrode group during the long-term charge-discharge cycle, resulting in too fast local capacity decay, which seriously affects the cycle life of the battery.

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