Sheet metal resistor and manufacturing method thereof

Abstract

The invention discloses a sheet metal resistor and a manufacturing method thereof. The sheet metal resistor is composed of an alloy sheet, a lead wire and a shell. The alloy sheet and the lead wire are produced from a strip material. In order to ensure the manufacturing efficiency and positioning accuracy of the parts, the strip material is punched into the lead wire and the alloy sheet by continuous die punching. The alloy sheet and the lead wire after punching contain process holes for positioning, and the alloy sheet and the lead wire after punching are welded together to form a resistor body. In order to meet the accuracy requirements, the resistance adjustment of the resistor body includes two steps: rough adjustment and fine adjustment. The resistance value after rough adjustment reaches more than 95% of the target resistance value, and the resistance value after fine adjustment achieves the accuracy range of the target resistance value. The resistor body after resistance adjustment is encapsulated in a strip material form, which improves the efficiency of operation. The encapsulated stripe-shaped resistor body is punched into single resistors. A nickel layer and a tin layerare formed by electroplating on the surface of the lead wire of each single resistor, which improves the wettability of welding.

Description

technical field [0001] The invention relates to the technical field of precision chip resistors, in particular to a metal plate chip resistor and a manufacturing method thereof. Background technique [0002] In the fields of inverter air conditioners, new energy electric vehicles, aerospace, power adapters, etc., they are all applied to current detection resistors for real-time detection of current. To achieve: (1) Overcurrent protection, monitor the current flowing through the output terminal of the motor or power supply, and adjust the output current if the load changes; (2) Multi-phase load balancing, monitor the ampere value of each current-carrying line , and affect the real-time response, so that the circuit can be guaranteed to work reliably in a wide temperature range. [0003] This type of current detection resistor has the characteristics of small resistance and high precision. Its resistance is generally at the milliohm (mΩ) level, and the allowable deviation ran...

AI Technical Summary

Problems solved by technology

[0007] Most current detection resistors of metal plate resistors in China are plug-in resistors made of manganese copper, which have the disadvantages of large volume, high inductance, and difficulty in automatic production; especially in today's miniaturization and miniaturization of equipment, the current The detection element also puts forward the requirements of smaller size and higher power. The traditional plug-in current detection element must be replaced by a smaller SMD current detection element.

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