Lithium ion battery isolated in partition by using positive temperature coefficient (PTC) materials

Abstract

The invention discloses a lithium-ion battery adopting PTC material for partition isolation, which is divided into at least two capacity units inside, and the tabs of the same polarity in different capacity units are extended and brought together to form the lithium-ion battery. Anode tabs or cathode tabs. In the anode tabs and / or cathode tabs, tabs from different capacity units are isolated from each other by a layer of PTC material. The interior of the lithium-ion battery of the present invention is divided into several small capacity unit areas by the PTC material. When the battery fails internally when it is abused or damaged, the local current is too high due to a short circuit inside the battery, and the temperature rises at the same time. When the temperature reaches When the working temperature of the PTC material increases, the resistance increases instantaneously, blocking the conduction path of the current, isolating the area where the failure occurs, controlling the speed of the failure reaction, and preventing a more serious chain reaction.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium-ion battery using PTC materials to isolate the interior by partitions. Background technique [0002] Compared with other types of batteries such as lead-acid and nickel-cadmium, lithium-ion batteries have the advantages of large specific capacity, high operating voltage, fast charging speed, wide operating temperature range, long cycle life, small size, and light weight. At present, it has been widely used in mobile phones, notebook computers, electric tools and other fields, and its application range is becoming wider and wider. [0003] With the expansion of the scope of use of lithium-ion batteries, we are used to calling the chemical power sources used in power supply systems power batteries. The safety performance puts forward higher requirements. At present, lead-acid batteries and nickel-cadmium batteries are mostly used as power batteries in the traditional sense. The...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the safe application of large-capacity single lithium-ion power batteries, optimizes the existing power battery mode, and provides a lithium-ion battery. The battery capacity units are partitioned inside the battery, and PTC (Positive Temperature Coefficient Thermistor material) material isolation can effectively solve the large-scale destructive chain reaction caused by the failure of large-capacity lithium-ion batteries, and control the speed and scale of the destructive reaction when the battery fails internally

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