Positive electrode piece, negative electrode piece of lithium ion capacitance battery and manufacture method of two electrode pieces thereof

Abstract

The invention relates to a positive electrode piece, a negative electrode piece of a lithium ion capacitance battery and a manufacture method of two electrode pieces thereof. The positive electrode piece of the lithium ion capacitance battery is characterized in that a positive electrode substrate (11) is an aluminum foil, an active carbon layer (13) is respectively clamped between the positive electrode substrate (11) and positive electrode material layers (12) arranged at both sides of the positive electrode substrate (11), and the active carbon layers (13) and the positive electrode material layers (12) form a positive electrode coating layer (14). The negative electrode piece of the lithium ion capacitance battery is characterized in that a negative electrode substrate (21) is a copper foil, an active carbon layer (23) is respectively clamped between the negative electrode substrate (21) and negative electrode material layers (22) arranged at both sides of the negative electrode substrate (21), and the active carbon layers (23) and the positive electrode material layers (22) form a negative electrode coating layer (24). The invention also provides the manufacture method of the two electrode pieces: the positive electrode piece and the negative electrode piece. The invention has the advantages of small size, low cost, fast charging (the charging time is only five minutes), high safety, simple manufacture method and high efficiency.

Description

technical field [0001] The invention relates to a positive electrode sheet and a negative electrode sheet of a rechargeable battery, in particular to a positive and negative electrode sheet of a lithium-ion capacitor battery using laminated cells and a method for making the two electrode sheets. The invention belongs to the field of power batteries , mainly used in various hybrid electric vehicles and pure electric vehicles as the power source of lithium-ion capacitor batteries. Background technique [0002] Lithium-ion capacitor batteries commonly used at present are lithium-ion capacitor batteries using laminated cells. These lithium-ion capacitor batteries include external lithium-ion capacitor batteries with balancing devices and capacitors placed outside the shell, and there are no balancing devices and The built-in lithium-ion capacitor battery with the capacitor placed inside the casing, and other various types. But no matter which kind of lithium-ion capacitor batte...

AI Technical Summary

Problems solved by technology

But these existing lithium-ion capacitor batteries have the following major defects: (1), fast charging and discharging time is long, poor in safety, and charging efficiency is low

The charging and discharging time of existing lithium-ion capacitor batteries is generally about half an hour, which is a long time and has not realized real short-term fast charging and discharging. Even if the charging can be completed in about half an hour, its charging efficiency can generally only reach 80%. Unsafe accidents such as explosions are prone to occur, and the safety is poor

This is because the existing lithium-ion capacitor battery is generally completed in a few hours during normal charging and discharging, and lithium ions migrate from the positive electrode to the negative electrode through the electrolyte and diaphragm, so that normal charging and discharging can be completed; When fast charging and discharging, it is usually completed in about half an hour, that is, charging and discharging is completed quickly under the condition of high current. At this time, the amount of lithium ion migration is large, and the negative electrode has no time to receive it, which will block the migration channel and make these migrating lithium ions The ions are squeezed on the surface of the negative electrode, thereby forming lithium dendrites on the surface of the negative electrode, which reduces the charging efficiency and shortens the service life of the battery. The crystal will pierce the diaphragm, causing a short circuit between the negative electrode and the positive electrode, causing explosions and other phenomena, and the safety is extremely poor.

In order to achieve real fast charging, it is necessary to quickly charge and discharge, which is generally required to be completed safely within a few minutes. Technical problems; (2), large volume, high cost

Due to the existence of capacitors in lithium-ion capacitor batteries, the capacitors occupy a certain space, making the current lithium-ion capacitor batteries bulky, causing many inconveniences such as transportation and installation, and the materials and installation of capacitors occupy a certain cost, making the cost higher

Images