Method for improving electrolyte infiltration of ternary battery and obtained battery
A ternary battery and electrolyte technology, applied in the field of lithium ion batteries, can solve the problems of affecting the formation of SEI film and uneven distribution of electrolyte, and achieve the effect of shortening the soaking time, shortening the soaking time, and shortening the production process.
Inactive Publication Date: 2020-07-10
HUBEI JINQUAN NEW MATERIALS CO LTD
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Problems solved by technology
[0008] For the ternary soft-pack power lithium-ion battery in the prior art (especially the high-nickel ternary soft-pack power lithium-ion battery), the method of injecting liquid once and standing for a long time at normal temperature and pressure leads to uneven distribution of electrolyte , the problem that affects the formation of SEI film
Method used
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Effect test
Embodiment 1
[0038] After liquid injection, the high-nickel ternary soft-pack batteries were vibrated at a frequency of 25Hz for 8 minutes in turn. After the batteries were packaged, the insulation resistance was tested to screen out defective products, and they were left to stand for 60 minutes in an environment with a vacuum degree of -80KPa.
Embodiment 2
[0040] After liquid injection, the high-nickel ternary soft-pack battery was vibrated at a frequency of 10Hz for 8 minutes in sequence. After the battery was packaged, the insulation resistance was tested to screen out defective products, and it was left to stand for 60 minutes in an environment with a vacuum degree of -80KPa.
Embodiment 3
[0042] After liquid injection, the high-nickel ternary soft-pack batteries were vibrated at a frequency of 50Hz for 8 minutes in sequence. After the batteries were packaged, the insulation resistance was tested to screen out defective products, and they were left to stand for 60 minutes in an environment with a vacuum degree of -80KPa.
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The invention discloses a method for improving electrolyte infiltration of a ternary battery and the obtained battery. The method comprises the following steps: sequentially carrying out vibration andvacuum standing on the ternary battery after liquid injection. The invention aims at solving the problems that in the prior art, a method of one-time liquid injection and long-time normal-temperatureand normal-pressure standing for a high-nickel ternary soft package power lithium ion battery causes non-uniform distribution of an electrolyte and further influences formation of an SEI film. According to the method disclosed by the invention, a vibration and vacuum standing method replaces the normal-temperature and normal-pressure standing method, and vibration is carried out after liquid injection of the battery, so that the electrolyte infiltration time is effectively shortened, and the electrolyte infiltration efficiency is improved; and then vacuum standing is used for replacing conventional normal-temperature and normal-pressure standing, so that the infiltration time of electrolyte to mesopores and micropores of the electrode plate is shortened, the infiltration effect is improved, the cycle life is prolonged, the production and manufacturing process of the soft package lithium ion battery is shortened, and the production efficiency is improved.
Description
technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for improving the electrolyte infiltration of a ternary battery and the obtained battery. Background technique [0002] Due to its high working voltage, energy density, long life and environmental friendliness, lithium-ion batteries have become the power source of a new generation of electric vehicles, electric tools and electronic products, and have been widely used in energy, transportation, communications, etc. in different fields. [0003] The current commercialized power lithium-ion batteries are mainly lithium cobaltate, lithium manganate, lithium iron phosphate and nickel-cobalt-manganese ternary batteries. Power batteries require batteries with high energy density and high safety, and lithium cobalt oxide is not suitable for power batteries because of its poor thermal stability, while lithium manganese oxide has low energy density and i...
Claims
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Login to View More IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 侯桃丽李辉王辉胡志海卢海燕何巍
Owner HUBEI JINQUAN NEW MATERIALS CO LTD