Lithium battery refers to cylindrical lithium battery, generally refers to 18560 lithium battery, cylindrical lithium battery is more researched, and technically discusses common battery types. It is mainly composed of positive, negative, isolation, positive and negative current collectors, valves, over-current maintenance and installation, insulation components and shells.
The shell, there were many steel shells in the early days, and aluminum shells are the main ones at this stage. There are lithium cobalt oxide batteries, lithium manganese oxide batteries, and ternary materials. The three types of data batteries have their own characteristics, and batteries are commonly used in: notebook computers, digital cameras, lighting equipment, children's toy enterprise products, pneumatic tools, mobile energy and other categories. This paper discusses several technical points of cylindrical batteries.
The area battery structure takes the power battery as an example. The 18560 cylindrical battery is the battery type that has been studied and discussed the most. It is mainly composed of positive and negative barriers, positive, negative, set, safety valves, overcurrent maintainers, insulating components and shells. For the outer shell, there were many steel shells in the early days, and the aluminum shells are currently the main ones. The safety valve inside, PTC is shown in the figure below.
Each manufacturer has a different design for a single lithium battery over-current maintainer. According to different safety requirements, the price is also different, and it can be customized. At present, the commonly used safety maintenance and installation mainly include PTC temperature coefficient maintenance and installation and fusing maintenance and installation. When the PTC current is too large, the resistance heats up, and the temperature builds up to increase the PTC resistance. When the temperature exceeds a threshold, the PTC resistance rises sharply, which is equivalent to isolating the faulty cell from the entire circuit to prevent further thermal runaway.