Cylindrical lithium ion battery and combination method thereof

Abstract

The invention discloses a cylindrical lithium ion battery, which comprises a cap, a housing, an electric core and an electrolyte, wherein the electric core is accommodated in the housing, the electrolyte is adsorbed in the electric core, the electric core is provided with a supporting rod at the center, the section of the supporting rod is of a regular polygonal hollow structure, the electric coreis wound into a cylindrical shape around the supporting rod by a positive plate, a negative plate and a diaphragm arranged between the positive plate and the negative plate at intervals, the top endand the bottom end of the electric core are respectively provided with a positive tab and a negative tab which are welded on the middle parts of the positive plate and the negative plate, and insulating sheets are respectively arranged between the positive plate and the positive tab and between the negative plate and the negative tab. The invention further discloses a combination method of the cylindrical lithium ion battery, which adopts a connection mode of first series connection and then parallel connection to combine cylindrical lithium ion batteries into a lithium ion battery module. According to the invention, the high power and high current performance of the lithium ion battery can be effectively guaranteed, and the defect that the series-parallel combination mode of the lithium ion batteries in the prior art has high requirements on the consistency of the lithium ion batteries is overcome.

Description

technical field [0001] The present invention relates to the technical field of lithium ion batteries, more specifically, to a cylindrical lithium ion battery, and to a method for combining cylindrical lithium ion batteries. Background technique [0002] With the implementation of clean energy policy planning at home and abroad, the demand for clean energy is increasing. Under the guidance of the policy, the industrialization of lithium-ion batteries has rapidly increased. Lithium-ion batteries usually have three packaging forms: square metal casing, cylindrical metal casing, and flexible aluminum-plastic film. Among them, the cylindrical metal casing has many advantages such as high degree of automation and excellent product consistency, making it an ideal battery for power, energy storage, The main packaging form in the communication and other market fields. [0003] At present, since the main focus of the lithium-ion battery industry is to increase the capacity density of...

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Problems solved by technology

[0003] At present, since the main focus of the lithium-ion battery industry is to increase the capacity density of lithium-ion battery products, there is still a lack of improvement in the high power and high current (high power density) of lithium-ion batteries, and the main performance of a single lithium-ion battery It is often not able to meet the requirements of the application scenario. It is necessary to combine a single lithium-ion battery in series and parallel to meet the actual needs of different users. The combination principle of lithium-ion batteries seems simple, but the actual situation is very complicated. Because a single lithium-ion battery Even if there are only small differences between ion batteries after screening, they will be amplified in the process of multi-series and multi-parallel, which will bring great troubles on the application side, and even lead to a series of problems such as life attenuation, battery failure, and safety.

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