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Mobile WebSiteNo matter in which industry, as long as the wiring harness and other electrical equipment, parts, devices connected, then the connection of the assembly, technical essentials are very clearly required: must be tightened, not loose, the reason is:
(1) If it is loose, the contact resistance will increase when the current passes through, resulting in heat and even fire and causing fire. Eventually, it will cause safety accidents. For the power battery, the connection of the high voltage line is related to vehicle safety
(2) If the disconnection is disconnected, the airtight seal is ineffective for the battery pack, followed by an insulation alarm, and the vehicle has a limited running failure;
However, one case led me to think more deeply about this tightening requirement. Last year, a small-scale climbing of a project led to the emergence of three cases of water-proof terminals coming out of the production line, and the battery pack sealed. The phenomenon showed that: There are flaws in the fastening method, so the investigation is carried out in several ways:
1, the quality of parts compliance - the retention of the waterproof terminal to detect
2. Whether the assembly process generates additional pulling force---causes the terminal to be pulled off
The end of the analysis, the harvest is still great:
1. The test result of the terminal retention force shows that the terminal pull-off force is consistent, and the quality of parts is reliable and reliable.
Through the force analysis of the wire harness assembly, we started from the technical requirements of the wire harness, and changed the assembly state of the incoming cable ties from being tight to tight but not tight, as shown in the video:
When assembling, the order from the original: ties fixed into the hole - fastening harness and terminals Fastening harness and terminals - ties into the hole - tightening ties.
