Cylindrical lithium-manganese dioxide battery structure with high capability and preparation method thereof

Abstract

The invention relates to a cylindrical lithium-manganese dioxide battery structure with high capability, wherein a ring of diaphragm (4) is wrapped on an outer surface of an anode electrical core (3), a lithium band (5) is arranged between the diaphragm (4) and a steel shell (1), a cover assembly (9) is located on the inner upper end of the steel shell (1), an anode core post (7) is located in the middle of the cover assembly (9), a metal connecting strip (10) is connected with the anode core post (7), the cover assembly (9) is provided with a liquid injection hole (11) and a sealing pin (8) for sealing the liquid injection hole (11), and an insulation sheet (6) for isolating an anode piece (3) from the lithium band (5) is arranged at the inner bottom of the steel shell (1). By adopting the cylindrical lithium-manganese dioxide battery structure, the capability of the battery is increased by 25.0%-36.4%, and the cost of materials is reduced. The invention further discloses a method for assembling the cylindrical lithium-manganese dioxide battery structure with high capability.

Description

technical field [0001] The invention relates to a high-capacity cylindrical lithium-manganese battery structure, and also relates to a preparation method of the high-capacity cylindrical lithium-manganese battery structure. Background technique [0002] The main components of the existing cylindrical lithium-manganese batteries are mostly a positive electrode sheet, two layers of separator and a layer of negative electrode sheet stacked together to wind the positive electrode sheet, separator and negative electrode sheet into a whole cell (Such as figure 2 shown), and then put it into the steel shell, connect the positive stem through the positive lug, and connect the negative lug to the steel shell to form the positive and negative poles of the battery (such as image 3 As shown), this kind of integral cell structure is very demanding and troublesome when winding. Moreover, this increases the contact area of ​​the positive and negative electrodes and increases the probabi...

AI Technical Summary

Problems solved by technology

[0002] The main components of the existing cylindrical lithium-manganese batteries are mostly a positive electrode sheet, two layers of separator and a layer of negative electrode sheet stacked together to wind the positive electrode sheet, separator and negative electrode sheet into a whole cell (like figure 2 shown), and then put it into the steel shell, connect the positive stem through the positive lug, and connect the negative lug to the steel shell to form the positive and negative poles of the battery (such as image 3 As shown), this kind of integral cell structure is very demanding and troublesome when winding

Moreover, this increases the contact area of ​​the positive and negative electrodes and increases the probability of internal short circuit. The short circuit current up to several amps or even tens of amps also brings hidden dangers to safety. In addition, the gap between the winding layers is occupied. The effective battery cell space is reduced, so that the proportion of the positive electrode to the total weight of the battery is low, and the battery capacity cannot be maximized. The larger contact area between the positive and negative electrodes makes the amount of diaphragm used larger, which increases the cost of battery materials, and the relatively complicated operation also affects Increased production efficiency and finished product pass rate, not conducive to large-scale production (as shown in Table 1)

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