Method for testing voltage-withstanding insulation of total anode of lithium battery module to shell

Abstract

The invention discloses a method for testing voltage-withstanding insulation of a total anode of a lithium battery module to a shell. According to the method, a low-voltage insulation test system is used for testing before BusBar welding is carried out on a lithium battery module; the method specifically comprises the following steps: modifying and optimizing a relay circuit board of a low-voltageinsulation test system; changing a circuit for connecting the positive electrode and the negative electrode of each battery cell through switching of a relay, and simulating the series-parallel connection state of the battery cells after BusBar welding of a lithium battery module by utilizing a probe, a high-voltage silica gel wire and a printed circuit in a relay board; connecting a positive electrode of a withstand voltage tester of the low-voltage insulation test system with a simulated total positive electrode, and connecting a negative electrode of the withstand voltage tester with a lithium battery module shell, so that a required test loop is formed, an insulation value and a withstand voltage value of the total positive electrode to the shell are measured, and a BusBar-imitated insulation and withstand voltage test before BusBar welding is realized. According to the invention, the overall test efficiency is improved, and the production cost is reduced to a certain extent.

Description

【Technical field】 [0001] The invention belongs to the technical field of low-voltage insulation testing of modules on a lithium battery module production line, and specifically refers to a method for testing the withstand voltage insulation of a total positive electrode of a lithium battery module to a casing. 【Background technique】 [0002] As an important part of the sustainable development of human beings, new energy is attracting more and more attention from the society along with the depletion of traditional energy sources in the world. Among them, power lithium batteries, as an important part of new energy vehicles, are in increasing demand. In the field of lithium battery module production, the low-voltage insulation test of lithium battery modules is a necessary step to verify the electrical performance and safety of the module in the production of lithium battery modules. Module manufacturing enterprises are in urgent need. [0003] Some companies in the industry ...

AI Technical Summary

Problems solved by technology

Since all the batteries in the module have been welded together after the BusBar is welded, if the insulation test of the total positive pole of the module to the shell is NG, it will be very troublesome to disassemble and distinguish the qualified batteries and reuse them, or even only All batteries are scrapped, and since the electrical performance of the total positive electrode to the shell is only tested after the BusBar is welded, it is impossible to judge whether it is caused by the BusBar welding if the test shows NG

It not only affects the efficiency of module production and testing, but also increases the production cost because the batteries are difficult to recycle.

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