Process for modifying superfine glass fibre diaphragm of lead-acid accumulator

Abstract

The present invention provides a cap assembly for a secondary battery having a can and a roll electrode assembly received in the can. The cap assembly comprises a negative plate for mounting on an upper end of the can, a positive plate disposed on the negative plate, an insulating member disposed between the negative and positive plates, a current control member disposed on the positive plate, and a rivet penetrating central portions of the negative and positive plates, the rivet being insulated from the negative plate by a gasket and connected to the roll electrode assembly through a tab. The current control member reduces conductivity between the rivet and the positive plate, thereby cutting off the flow of the current.

Description

technical field [0001] The present invention relates to a cover assembly of a square storage battery capable of cutting off a conductive circuit when an overcurrent occurs due to an abnormality of the battery, preventing explosion and ensuring safety. Background technique [0002] Secondary batteries can be recharged and miniaturized or increased in capacity. In the past, such batteries mainly included nickel-metal hydride (Ni-MH) batteries and lithium-ion (Li-ion) batteries. [0003] Among them, the lithium-ion battery uses lithium-transfer metal oxide as the anode active material; carbon or carbon composite as the cathode active material, and lithium ions move between the above-mentioned anode and cathode to generate an electromotive force for charging and discharging. [0004] image 3 Indicates the overall structure of a well-known lithium-ion battery in the past. [0005] The structure of the lithium-ion battery is: the electrode core 2 wound together by the anode, the...

AI Technical Summary

Problems solved by technology

However, for a prismatic battery whose lid assembly and case are laser welded, if Figure 4 shown must be mounted outside the battery

[0011] Therefore, the problem that arises is that in a prismatic battery other parts must be added outside the cell, so that the effective height in the total height of the battery is correspondingly reduced by exactly the same amount as the height of the current limiter

[0012] Therefore, the past square storage battery has the disadvantage of having to reduce the battery capacity in order to ensure safety against overcurrent.

In addition, there is also a problem that the current limiter is structurally unstable because the current limiter is exposed to the outside of the battery.

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