Fast-liquid-injection high-infiltration long-service-life lithium battery and manufacturing method and mold thereof

Abstract

The invention discloses a fast-liquid-injection high-infiltration long-service-life lithium battery and a manufacturing method and a mold thereof. The long-service-life lithium battery comprises a casing and a top cover, wherein the top cover seals a casing opening; a liquid injection opening is formed in the top cover; a plurality of mutually staggered and stacked positive and negative electrode plates are arranged in the casing; diaphragms are separated between the positive and negative electrode plates; each of the positive and negative electrode plates consists of a base plate and a slurry coating layer coating the surface of the base plate; a groove penetrating through the slurry coating layer to reach the base plate is at least formed in the positive electrode plate.

Description

technical field [0001] The invention relates to a long-life lithium battery, a method for manufacturing the long-life lithium battery and a mold for manufacturing the long-life lithium battery. Background technique [0002] Due to the advantages of high voltage, high specific energy, long cycle life and long storage time, lithium-ion batteries are widely used in portable electronic devices such as mobile phones, digital cameras and laptop computers, and are also widely used in electric vehicles and electric tools As well as large and medium-sized equipment such as industrial energy storage, but large square lithium-ion batteries have a large volume, less internal space, and high electrode density, resulting in slow liquid injection and long soaking time. [0003] The existing long-life lithium battery injection technology generally uses a liquid injection machine for vacuum injection. First, the inside of the battery is evacuated, and then the electrolyte is injected into th...

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Problems solved by technology

[0002] Due to the advantages of high voltage, high specific energy, long cycle life and long storage time, lithium-ion batteries are widely used in portable electronic devices such as mobile phones, digital cameras and laptop computers, and are also widely used in electric vehicles and electric tools And industrial energy storage and other large and medium-sized equipment, but the large square lithium-ion battery has a large volume, less internal space, and a high density of pole pieces, resulting in slow liquid injection and long soaking time

[0003] The existing long-life lithium battery injection technology generally uses a liquid injection machine for vacuum injection. First, the inside of the battery is evacuated, and then the electrolyte is injected into the battery case through the injection pump. Since the electrodes are closely connected and the battery is empty The space is small, resulting in slow diffusion of the electrolyte and slow infiltration of the pole piece. It is often necessary to wait for a period of time (5-30min) after injecting a certain amount of electrolyte. After the pole piece absorbs a certain amount of electrolyte, inject the required electrolyte again. Injection inefficiency

[0004] In order to ensure that the lithium-ion battery is fully static and activated before formation, the electrolyte can fully infiltrate the electrode sheet and separator. The process generally used in the prior art is to control a certain relative humidity and temperature after liquid injection and before formation, and to stand for a long time. , such as standing at room temperature for 5-9 days (120-216h), or high temperature, temperature 40-55°C, time 2-4 days (48-96h), long standing time, low standing efficiency

[0005] In the existing lithium-ion battery technology, some electrolytes lost in the formation are supplemented by secondary injection after formation. The secondary rehydration is time-consuming and laborious, and often has certain risks.

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