Safe high-energy folding case lithium ion battery and its production technology

Abstract

The invention relates to a joggled shell lithium ion battery that forms a composite battery shell with metal chaff and temperature-sensitive macromolecule. Five temperature and pressure safety valves are equipped on a metal / macromolecule composite joggled shell, which overcomes problem of present liquid state lithium ion battery and defects of polymer soft package batteries, and improves battery reliability. Compared with present liquid state metal shell lithium ion battery, the joggled shell lithium ion battery of the invention has volume improved 10% to 30%; compared with present polymer soft package batteries, the battery of the invention has volume improved 3% to 10% with tympanites and liquid leakage rate less than 0.1ppm. In addition, there is a little of joggled plate material, manufacturing device and mould being simple. Consumption of the materials and energy loss in process is less, which reduces cost, manufactures the battery adequately, meets need of the customers for various battery sizes and fills blank of super thin lithium ion battery field below 3.0mm.

Description

technical field [0001] The invention relates to a preparation method and production process of a novel secondary lithium ion battery. The lithium-ion battery uses an innovatively designed and uniquely prepared metal / polymer composite shell and safety valve device, which not only significantly enhances the safety of the battery, but also increases the battery capacity, and overcomes the liquid lithium-ion battery produced by current technology. The problems and various defects of the polymer flexible packaging battery improve the reliability of the battery. This process technology can not only produce digital batteries used in electronic products such as Bluetooth and mobile phones, but also produce large-capacity and high-power power batteries, which are used in large-scale equipment such as electric vehicles, aviation and aerospace. [0002] The folded shell lithium ion battery of the present invention can also be called a hard shell polymer lithium battery, and the folded s...

AI Technical Summary

Problems solved by technology

The liquid lithium-ion batteries and polymer soft-pack lithium-ion batteries produced by the prior art not only cannot meet the requirements in terms of thinness, lightness, arbitrary shape and energy density, but also have the following problems and defects:

However, polymer flexible packaging lithium-ion batteries also have their problems and shortcomings: ①The soft and fragile aluminum-plastic composite film shell is easy to damage, resulting in low yield and high production cost in the production process; ②The raw materials depend on imports from Japan, and the price More expensive, high material cost; ③In the process of stamping the aluminum-plastic composite film into a box, due to being stretched, the inner CPP film is easily damaged, resulting in the occurrence of box cancer defects, which will slowly cause battery swelling and leakage ;④The aluminum-plastic composite film shell is sealed by heat and pressure, and the defect rate is high, which often causes defects such as battery bulging, liquid leakage, and shell damage, which not only cause battery failure, but also bulging and leaking batteries will damage the electronics around the battery. components, leading to damage and failure of the entire electronic device

Therefore, under the condition of the same square size, metal-shell liquid lithium batteries are less filled with active battery materials than polymer soft-pack lithium batteries, so their battery capacity is 10% to 30% lower

[0009] (4) The cost of mold opening for the metal case of new battery products is high and the cycle is long: With the development of the mobile communication, digital and consumer electronics markets, requirements for different dimensions of batteries emerge in an endless stream, and there are various battery specifications.

These not only increase the new product development cost of battery manufacturers, but also, in the face of the rapidly changing market, the longer development time cycle reduces the market competitiveness of battery companies

[0010] (5) Due to the limitation of the existing technology, the thickness of the metal shell lithium battery can only produce battery products with a thickness specification of 3.0mm or more

For thin or ultra-thin lithium batteries smaller than this thickness requirement, the existing production technology is difficult to achieve

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