Coin cells and coin cell current collectors

Abstract

The invention discloses a button cell, comprising a positive cap, a positive plate, a diaphragm, a lithium sheet and a negative cap, which are stacked successively, wherein a current collection grid is arranged between the positive cap and the positive plate; the current collection grid comprises a plurality of parallel current collector sheets curved and bent repeatedly relative to a base plane of the current collection grid; the repeatedly curved and bent current collector sheets provide elasticity for the current collection grid, absorb an internal dimension error due to large dimensional tolerance of internal components of the cell or consumption of interior materials, and ensure and always maintain good contact effect and conductivity between internal components of the cell, thereby reducing the internal resistance of the cell, and increasing the discharging current and the cell capacity. The invention also discloses a button cell current collector which comprises the current collection grid, wherein the current collection grid comprises the plurality of parallel integrated impact-molded current collector sheets curved and bent repeatedly relative to the base plane of the current collection grid. The current collector ensures and always maintains a good contact effect for the interior of the cell to which the current collector is applied, reduces the internal resistance of the cell, and increases the discharging current and the cell capacity.

Description

technical field [0001] The invention relates to the field of batteries, in particular to button batteries. The invention also relates to current collectors for coin cells. Background technique [0002] At present, lithium-manganese dioxide batteries have become an indispensable new energy source in various fields of the national economy, and small button-type lithium-manganese dioxide batteries are favored for their lightness and compactness, and have been widely used in electrical appliances and electronic products. . Existing button cells generally consist of a negative bottom cover, a lithium sheet, a diaphragm, an electrolyte, a manganese sheet, and a positive electrode cover. There are also some batteries with a braided mesh between the positive electrode cover and the manganese sheet (positive electrode sheet) as a current collector. However, during the production process of the battery, due to many unstable factors in the production process, the internal components...

AI Technical Summary

Problems solved by technology

The function of concave and convex points or wavy lines and ring lines is to collect current by multi-point contact, but it is still a solid and inelastic structure, and the gaps generated after the internal material is consumed cannot be automatically absorbed by the internal structure

Therefore, after a certain period of use, the cured structure cannot overcome the gaps generated by internal consumption, resulting in internal gaps, resulting in defects such as high resistance, reduced current, and unstable voltage.

Dimensional errors in the thickness direction during the manufacturing process cannot be absorbed by the cured structure to make the internal structure tight

Therefore, the button-type lithium battery made by the technical scheme of this utility model has defects such as large resistance, unstable current and voltage, and low product qualification rate.

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