Sealing gasket and composite glass sealing method of aluminum case power lithium ion battery

Abstract

The invention discloses a method for sealing a sealing gasket of an aluminum shell power lithium-ion battery and a composite glass. The method is as follows: a multi-layer composite temperature-resistant gasket 130 is processed, which contains hydrofluoric acid corrosion-resistant phosphate glass and Glass ceramic powder filler with a high coefficient of thermal expansion, then pass the temperature-resistant gasket through the electrode pole 110, place it on the upper surface of the bottom plate of the pole column, and fix it with a sealing fixture, on the upper surface of the temperature-resistant gasket and on the sealing cover A layered composite sealing glass preform 140 is placed between the plate 120 and the electrode pole, and finally the oxidation-resistant aluminum positive pole assembly is sent to the sealing furnace for sealing in the air, and at the same time, the copper or copper alloy bottom plate The negative electrode pole assembly is sent to an atmosphere (such as vacuum or nitrogen N 2 ) to protect the furnace, so as to obtain better air tightness than plastic mechanical pressing sealing technology, simpler process than ceramic metallization sealing technology, and better glass sealing effect than plastic sealing.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a sealing gasket and composite glass sealing method of an aluminum shell power lithium ion battery. Background technique [0002] A battery refers to a cup, tank or other container or a part of a composite container that contains an electrolyte solution and a metal electrode to generate current. It is a device that can convert chemical energy into electrical energy. It has a positive pole and a negative pole. With the advancement of technology, the battery Generally refers to small devices that can generate electric energy, such as solar cells. The performance parameters of the battery mainly include electromotive force, capacity, specific energy and resistance. Using the battery as an energy source can obtain stable voltage, stable current, and stable power supply for a long time. It has a small impact on the current, and the battery structure is simple, easy to ca...

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Problems solved by technology

[0004] The object of the present invention is to provide a sealing gasket and a composite glass sealing method for an aluminum case power lithium-ion battery, to solve the problem of the existing composite pole construction and composite glass sealing of the aluminum case power lithium ion battery proposed in the above-mentioned background technology. There are still some unreasonable factors in the connection process. When the composite pole construction of the existing aluminum shell power lithium-ion battery is sealed with the composite glass, the plastic seal is not temperature-resistant, easy to be corroded, aged, and resistant to temperature changes. Poor performance, not anti-vibration, short life, no chemical bonding at the interface, easy to leak; when metallized ceramics are sealed, it is difficult to weld between ceramics and metals, metallized materials are not corrosion-resistant, ceramics are fragile, and residual thermal stress is generated during welding , Corrosion and interface thermal stress lead to damage to the reliability, stability, and service life of the seal, in addition to the disadvantage of complex manufacturing process, the existing sealing glass has poor thermal shock resistance and mechanical shock resistance

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