Battery liquid injection device with heating function and liquid injection method thereof

Abstract

The invention relates to a battery injection apparatus with heating functionality and a liquid injection method thereof. The apparatus comprises: a heat-conducting pipeline, an evacuating pipeline connected with a seal port of a battery to be injected, and an inflating pipeline; a distance between the heat-conducting pipeline and the inflating pipeline is less than a preset value; a heat-conducting medium is introduced into the heat-conducting pipeline and is used for conducting temperature to the inflating pipeline to heat a gas in the inflating pipeline; the inflating pipeline is used for charging the gas into the battery to be injected; the evacuating pipeline is used for evacuating the battery to be injected after inflating is finished. The technical scheme provided by the embodiments enables moisture in a plate not fully removed by baking to be fully discharged, the temperature of the plate can be increased, wetting angle of the surface of the plate can be increased, and therefore, wettability of a lithium-ion battery is greatly improved, moisture content of the plate is also reduced and the technical difficulty in putting lithium-ion batteries in large-size high-energy-density trend is overcome.

Description

technical field [0001] The invention relates to the technical field of battery production and manufacturing, in particular to a battery liquid injection device with a heating function and a liquid injection method thereof. Background technique [0002] New energy is the development trend of the future society. As an efficient and environmentally friendly new energy, lithium-ion batteries have outstanding advantages such as high working voltage, high energy density and long service life. At present, lithium-ion batteries have become the preferred power supply equipment for consumer electronics. One of the development directions of lithium-ion batteries is to continue to increase their energy density, which requires increasing the compaction density of the active material on the electrode sheet to increase its loading capacity. However, increasing the compaction density also means that the porosity of the electrode sheet is reduced, which makes it difficult for the electrolyte...

AI Technical Summary

Problems solved by technology

[0004] Improving the soaking time and soaking temperature became the first solution that comes to mind, but experiments show that the increase of soaking time and soaking temperature will cause the plate powder to separate from the substrate and cause the battery to fail

Adding surfactants to the electrolyte can also improve the wetting effect, but this not only increases the cost of the electrolyte, but also has a certain impact on the performance of the battery itself

There are also patent reports to directly heat the electrolyte, but as an electrolyte mainly composed of volatile organic compounds, direct heating will cause the electrolyte to volatilize, which may cause hidden dangers such as lithium salt precipitation and blockage of the liquid injection port.

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