Lithium ion battery floating liquid detection device and floating liquid detection method

Abstract

The invention discloses a lithium ion battery floating liquid detection device, which comprises an internal resistance detector, a positive electrode probe connected with a positive electrode of the internal resistance detector, and a negative electrode stopper connected with a negative electrode of the internal resistance detector. The lithium ion battery floating liquid detection device furtherincludes a support base and a positive electrode probe position control component. The positive electrode probe is fixedly mounted on the positive electrode probe position control component. The positive electrode probe position control component comprises a positive electrode cylinder and is slidably connected onto the support base. The positive electrode cylinder drives the positive electrode probe position control component to move so as to drive the positive electrode probe to move. The lithium ion battery floating liquid detection device of the invention uses the positive electrode probeand the negative electrode stopper of the internal resistance tester to test the internal resistance of lithium ion batteries so as to distinguish and eliminate floating liquid batteries, has a simpleand reasonable structure, forms an integrated production line with the existing lithium-ion battery manufacturing line, effectively sorts out the floating batteries without affecting the current production efficiency of the lithium-ion batteries, and prevents poor batteries with a floating liquid inside from flowing to the next station.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing, and in particular relates to a battery floating liquid detection device and a floating liquid detection method used in the lithium ion battery processing process. Background technique [0002] Due to the advantages of high energy and long storage time, cylindrical lithium-ion batteries are widely used in digital products, electric vehicles, electric tools and other products. With the enhancement of the public's awareness of environmental protection, the improvement of vehicle manufacturing capacity and the strengthening of global policy support, the development of new energy vehicles has attracted more and more attention, so people's requirements for the safety performance of lithium-ion batteries are also getting higher and higher. In particular, the safety of large-capacity lithium-ion batteries has always been one of the main issues restricting its development. Under ...

AI Technical Summary

Problems solved by technology

In the process of lithium-ion battery assembly in the prior art, after the liquid injection of lithium-ion battery cells is completed, the subsequent assembly steps are directly carried out, and the floating battery cannot be selected and removed in time, especially in the fully automated production of lithium-ion batteries. line, nothing can be done about it

Once the floating liquid is formed, the lithium-ion battery will easily form a liquid seal when sealing, resulting in adverse phenomena such as the battery CID flipping, the bottom of the steel shell bulges, the cutting groove seeps, and the shell mouth rusts.

After the lithium-ion battery is assembled, it is necessary to test the open circuit voltage and AC internal resistance inside the battery, and use the above two performance indicators to assist in judging the battery voltage platform state, power state, and internal resistance. Once a floating battery is generated, all All the test indicators will be wrong, which will not only lead to wrong judgments on the battery voltage platform and power state, resulting in wrong judgments on battery differences, but also lead to wrong judgments on the internal current resistance of the battery, resulting in wrong judgments on battery grades

[0004] At present, no detection device and detection method for the floating battery generated during the assembly process of lithium-ion batteries have been found in the prior art.

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