Organic ultracapacitor and manufacturing method thereof

Abstract

The invention is an organic ultracapacitor, comprising a shell body, a winding core assembly, electrolyte, an upper cover arranged above the opening side of the shell body, and a connecting piece arranged between the upper cover and the shell body; wherein, the positive and negative terminals of the capacitor are lead out from two sides thereof; the outer side of the shell body is connected with a capacitor terminal; the terminal and the shell body are connected with the upper cover by laser welding or resistance welding or casting moulding; the connecting piece is arranged between the capacitor core assembly and the upper cover, one side of the connecting piece is provided with a thread or bayonet structure and is connected with the upper cover, and the other side thereof is connected with the core assembly via laser welding; the welding areas of the core assembly and the inner side closed end of the shell body, and the core assembly and the connecting piece are 5-70%; the electrolyte is organic solution of tetraethylammonium tetrafluoroborate or organic solution containing lithium ion. The invention has the advantages of lowering the internal resistance of the organic ultracapacitor and improving the safety performance and service life thereof greatly.

Description

technical field [0001] The invention relates to an organic supercapacitor and components thereof, belonging to the field of electrochemical energy storage components. Background technique [0002] With the growing global energy crisis and the gradual deterioration of environmental pollution, high-efficiency, energy-saving, and environmentally friendly electric vehicles have become the focus of research and development by countries all over the world. At present, the bottleneck restricting the development of electric vehicles is the power drive system, and its energy carriers mainly include petroleum, batteries and supercapacitors. Due to its remarkable features such as high specific power (up to 5kw / kg) and long cycle life (it can be charged and discharged more than 100,000 times without any maintenance and maintenance), it occupies an irreplaceable position in the driving source of electric vehicles. , and its broad application prospects are increasingly emerging. [0003...

AI Technical Summary

Problems solved by technology

However, the current organic supercapacitor technology still has defects to some extent, which leads to certain safety hazards in organic supercapacitors. These safety hazards are mainly manifested in: when a large current is discharged, the terminals of the capacitor are overheated and may cause the terminals to separate from the capacitor; at the same time , when a large current is discharged, the capacitor body is overheated, and the internal air pressure increases, which may cause the capacitor to rupture

On the other hand, at present, the contact area between the lugs of the supercapacitor and the capacitor core group is small and the terminals are led out from the same side, which not only increases the thermal effect of the capacitor when it is discharged with a large current, but also is not conducive to the individual design of the capacitor.

The contact area between the current collector of the capacitor core group and the external terminal is too small, which will cause a large amount of heat to be generated when the capacitor is discharged with a large current. The accumulation of heat will cause the temperature of the capacitor to rise. The life of the capacitor is shortened, so that the capacitor has a greater safety hazard

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