A rechargeable hard-case lithium-ion battery

Abstract

The invention discloses a rechargeable hard shell lithium-ion battery, comprising a positive electrode assembly and a negative electrode assembly, the positive electrode assembly and the negative electrode assembly are insulated from each other, and a winding body installation space is formed between the two, and the winding body installation space An electrolyte solution and a winding body are arranged in the winding body, and the positive electrode tab and the negative electrode tab are drawn from the position close to the center of the winding body, the positive electrode tab is electrically connected to the positive electrode assembly, and the negative electrode tab is connected to the positive electrode assembly. The negative electrode assembly is electrically connected. Adopting the winding body whose tabs are led out near the center, the deformation of the winding body during the charge and discharge process has little pulling force on the pole piece, which can increase the charge and discharge times of the rechargeable battery and prolong the service life.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a rechargeable hard shell lithium ion battery. Background technique [0002] With the rise of wearable products, the diversification and miniaturization of electrical products are becoming more and more obvious. Due to the space limitation of electric products, the batteries used in them need to have the characteristics of small size and large power. Usually, the miniaturization of products will increase the requirements for manufacturing process level and product design level. When the product is miniaturized to a certain extent At this time, there will be a sharp increase in the requirements for the level of process manufacturing, and there will be a big change in the product design concept, or even a diametrically opposite change. [0003] Due to the increasingly high requirements for the battery life of the equipment, this requires the manufacturer to increase the actual i...

AI Technical Summary

Problems solved by technology

At present, there are mainly two structures as the power supply of wearable products in the market: soft pack and steel shell, among which the structure of the soft pack cylindrical battery is as follows: figure 1 As shown, the positive pole tab 1' and the negative pole tab 2' extend in two opposite directions. This structure occupies too much space for effective use, and the actual space used inside is greatly wasted. At the same time, the pouch battery Due to the packaging characteristics and the limitation of the punching depth of the aluminum-plastic film, its products cannot compare with steel-cased lithium-ion batteries in terms of miniaturization and energy density of cylindrical batteries. Steel-cased batteries have a more regular and beautiful shape. During use more favored

[0004] Due to the backwardness of the manufacturing process and design concept, the secondary lithium-ion rechargeable battery with the traditional structure has not been able to achieve industrial production, and even experimental samples cannot be produced. The main reason is that the winding body of the miniaturized secondary lithium-ion battery is wound. The layers are tight, the positive and negative pole pieces are stressed, and the winding body continues to shrink and expand during the use of the finished product, causing the positive and negative pole pieces to be pulled continuously. The smaller the size of the secondary lithium-ion battery, the wider the pole piece width is. The tensile force that it can withstand is too small, and the area near the blank foil at the spot welding of the most vulnerable pole piece is very prone to fracture

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