Battery pack vacuum liquid injection device and method

Abstract

The invention relates to a battery pack vacuum liquid injection device and method.The battery pack vacuum liquid injection device comprises a base, a vertical plate and a transverse plate, the vertical plate is fixedly installed on the side portion of the base and is perpendicular to the base, the transverse plate is movably arranged on the base through a thread lifting mechanism and is parallel to the base, and the transverse plate is used for containing a battery; a liquid supply cylinder and an air suction cylinder are fixedly installed on the side, facing the transverse plate, of the vertical plate, the liquid supply cylinder is used for containing electrolyte, an exhaust mechanism is installed on the liquid supply cylinder, and when liquid injection is conducted on the battery, a bottom outlet of the liquid supply cylinder is connected with the battery through an elastic sealing mechanism; an air pumping mechanism for vacuumizing the battery is mounted on the air pumping cylinder, and the air pumping mechanism is connected with the air exhausting mechanism through a one-way transmission mechanism, so that finally, the synchronism of vacuumizing and liquid injection is realized, only the battery is vacuumized, and the process efficiency, the battery vacuum degree, the liquid injection absorptivity, the product consistency and the quality are improved.

Description

technical field [0001] The invention relates to the technical field related to battery production and processing, in particular to a vacuum liquid injection device and method for a battery pack. Background technique [0002] Polymer lithium-ion batteries generally include a battery case and an electric core and an electrolyte contained in the battery case. The electric core includes a positive pole, a negative pole, and a separator between the positive pole and the negative pole; The negative electrodes play the role of conducting electrons, and serve as the lithium ion current transmission medium in the process of charging and discharging the battery, which is the guarantee for the polymer lithium ion battery to obtain the advantages of high voltage and high specific energy. Therefore, in the production process of polymer lithium-ion batteries, liquid injection is a very important process operation. [0003] In the existing liquid injection technology, the battery and the ...

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Problems solved by technology

[0003] In the existing liquid injection technology, the battery and the liquid injection cup are generally evacuated first, and after the vacuum is completed, the lower liquid port of the liquid injection cup is blocked, and then the liquid injection cup is ventilated to the atmosphere so that the cup is in a normal pressure state, and then the The electrolyte is poured into the liquid injection cup. After the injection is completed, the liquid injection port is opened. At this time, the battery is in a vacuum state. The liquid injection cup body is in a normal pressure state to form a differential pressure liquid; in this liquid injection mode, vacuum first After the liquid injection, the overall equipment capacity is low and the hardware cost is high; the battery and the cup need to be vacuumed, the vacuuming volume is large, the energy consumption is high, and the time is long; there are many valves in the liquid injection cup, which affects the vacuum degree of the battery and makes it difficult to reach the ultimate vacuum. Ultimately resulting in poor product absorption consistency

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