Cylindrical lithium ion battery

Abstract

The invention provides a cylindrical lithium ion battery. The cylindrical lithium ion battery comprises a battery cell, a battery cover cap and a protection plate, wherein the periphery of the battery cover cap is annular; the central part of the battery cover cap protrudes to form a mounting groove; the protection plate is placed in the mounting groove and is electrically connected with an anode plug and a cathode plug of the battery cell; the protection plate, the cover cap and the battery cell are fixed by low-temperature and low-pressure injection molding. According to the cylindrical lithium ion battery, the protection plate is placed in the battery cover cap so as to effectively utilize the space below the battery cover cap; the capacity of the battery is not reduced; the cylindrical lithium ion battery can be directly connected with an electric appliance for external use and the safety is high.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a cylindrical lithium ion battery. Background technique [0002] Due to the development of portable electronic products, rechargeable lithium-ion batteries have been widely used due to their characteristics of high voltage, high capacity, reusability, good safety, small self-discharge, and fast charging. However, due to the high energy density of lithium-ion batteries, they are easily damaged during overcharge, overdischarge, overcurrent, short circuit, ultra-high temperature charge and discharge, and low temperature use. For this reason, the existing lithium-ion batteries are equipped with battery protection plates to protect the cell protection interface of the lithium-ion batteries. There are two common design methods for adding protection boards to lithium-ion batteries. One is to install a protective plate on the head, tail or side of the battery, and the oth...

AI Technical Summary

Problems solved by technology

However, in the former method, because the protective plate needs to occupy a certain space, the shape of the battery will be changed, or the capacity of the battery will be reduced.

In the latter method, the protective plate not only occupies the internal space of the battery cell and reduces the battery capacity, but also the electrolyte will corrode the metal on the protective plate, so special materials are required for sealing and isolation, especially the battery positive lead of the protective plate is in the The battery must be connected from the top of the battery cell to the bottom of the battery cell, which brings about the insulation problem of the positive lead of the battery. At the same time, this is also a great safety hazard. Once the battery is short-circuited internally, the protection board will not be able to function.

Therefore, the method of placing the protection circuit inside the battery is not only difficult to produce, the yield is low, and the product has a greater safety hazard

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