Welding-free connector electrically connected with battery cell and lithium ion battery comprising same

Abstract

The invention discloses a welding-free connector electrically connected with a battery cell and a lithium ion battery. The welding-free connector comprises a current collecting bar, the current collecting bar is clamped with a connecting plate, the connecting plate comprises a back plate and clamping columns fixedly arranged on one side of the back plate at intervals, and a groove used for being clamped with the current collecting bar is formed between every two adjacent clamping columns; the periphery of the clamping column or the inner side wall of the groove is coated with a thermal decomposition material layer, and the thermal decomposition material layer is formed by compounding heat-sensitive resin and a modified material; and the back plate and the clamping columns are made of high-thermal-conductivity insulating materials. According to the invention, the electric connection connector assembly composed of the current collecting bar and the connecting plate connected with the current collecting bar in a matched manner is adopted, and has certain mechanical strength and good heat conduction capability at normal temperature. When a short circuit occurs, the heat-sensitive resinin the thermal decomposition material layer coated on the connecting plate is decomposed by heating, so that the pre-tightening force between the battery cell tab and the connecting sheet disappears,the connection between the battery cells is disconnected, the thermal runaway is prevented, and the safety of the battery is greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a non-welded connector for electrical connection of batteries and a lithium-ion battery containing the connector. Background technique [0002] In the past two decades, lithium-ion batteries have become the most important power source for new energy vehicles. In order to make it widely available, the performance of Li-ion batteries needs to be further reduced while improving their performance. In addition, in order to improve the cruising range of electric vehicles, the industry is still pursuing lithium-ion batteries with higher energy density. [0003] In the design of battery packs and modules, the design of fuses for the electrical connection between cells has always been a difficult point. When a problem occurs in a single cell, such as a micro-short circuit, if the electrical connection with the cell can be cut off in time, It can prevent further thermal run...

AI Technical Summary

Problems solved by technology

Compared with the square battery, the pouch battery has a more free shape design, but after the thermal runaway of the monomer, it is difficult to use the design similar to the explosion-proof valve of the square battery to guide the heat away, because the pouch battery breaks The place is random, and the heat generated will cause thermal runaway of the surrounding batteries one after another

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