Maintainable lithium ion battery and maintenance method thereof

Abstract

The invention relates to a maintainable lithium ion battery, which comprises a battery cell, a battery shell body, a battery anode post and a battery cathode post. The battery cell is arranged in the battery shell body and the battery anode post and the battery cathode post are arranged on the battery shell body on which at least one channel that is used for communicating the inside of the batter shell body and the outside is arranged. An openable sealing device is arranged at an exit of the channel communicated with the outside. Simultaneously, the invention also provides a maintenance method of the maintainable lithium ion battery, which includes such steps as removing gas in the battery through the channel, adding electrolyte, vacuumization and the like. The invention can effectively improve the performance of the lithium ion battery, thus more effectively utilizing the lithium ion battery and being beneficial to saving cost.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a maintainable lithium ion battery. Background technique [0002] Since the successful development of lithium-ion batteries in the 1990s, due to their unique advantages such as high energy, long cycle life, high working voltage, and no pollution, they have been widely used in mobile phones, digital cameras, notebook computers and other electronic devices. Electric appliances, and gradually expand to the application fields of large-capacity power lithium-ion batteries such as electric bicycles, electric vehicles, and backup power supplies. Lithium-ion batteries can be divided into two types according to the packaging form of the battery case, one is hard-shell lithium-ion batteries, usually packed in steel shells, aluminum shells, and plastic shells; the other is soft-packed lithium-ion batteries, usually packed in soft aluminum shells. Plastic composite film packaging is also divided int...

AI Technical Summary

Problems solved by technology

In the actual use process, the problem of the battery pack is generally only a small part of the single cells, such as low battery capacity, fast capacity decay, fast voltage rise during charging, and fast voltage drop during discharge, etc., resulting in problems with the entire battery pack.

The single battery with problems is largely due to the following two reasons: 1. Some side reactions inside the battery will consume the electrolyte, resulting in too little electrolyte participating in the battery reaction, which affects the lithium ion in the battery. Second, due to some side reactions in the battery, harmful gases will be generated, and the harmful gases produced will react with the battery material or remain between the positive electrode material, negative electrode material and diaphragm to affect lithium. transfer of ions, further damaging battery performance

[0005] Because lithium-ion batteries are very sensitive to moisture, a small amount of water can cause fatal damage to the performance of lithium-ion batteries, so lithium-ion batteries are completely sealed when used, and the traditional manufacturing method is irreversible.

[0006] Therefore, using the traditional method to manufacture lithium-ion batteries, there is basically no repair method after the battery has a problem, because one is that the harmful gas in the battery cannot be discharged; the other is that the battery cannot be replenished with electrolyte to improve the battery life performance

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