How does a tiny solenoid switch activate the "heart" of a car?

In the production workshop of Ningbo Kedong Auto Parts Co., LTD., technical workers are inspecting a batch of electromagnetic switches that are about to be sent abroad. This component, which is only the size of a palm, is the "power heart" of the car's starting system and intelligent control module. "Without reliable electromagnetic switches, no matter how advanced the car design is, it cannot be achieved."

01 Production Line Live Report: Cracking the Manufacturing Code of Electromagnetic Switches Entering the 5,000-square-meter production factory of Ningbo Kedong, the fully automatic winding machine is precisely winding copper wires as thin as hair onto the iron core. In the detection area, workers use advanced instruments to conduct strict tests on the pull-in voltage, release voltage and load capacity of electromagnetic switches. "The birth of an solenoid switch involves over 20 procedures," the workshop supervisor introduced. "The newly invested automated assembly line has increased production efficiency by 10%, and the annual customer defect rate is less than 1.5 per thousand." " Although electromagnetic switches are small, they are the core actuating components of automotive electrical systems. It operates based on the principle of electromagnetic induction, using a small current to control the on-off of a large current, ensuring multiple functions such as car starting, intelligent control, and safety protection.

02 Technological Breakthrough: The "Intelligent Evolution" of Electromagnetic Start Valves
As a key component of automotive engines and new energy thermal management systems, the performance of the electromagnetic start valve switch directly affects the starting efficiency and energy consumption level of the entire vehicle.

In traditional fuel vehicles, it controls the starting of the engine. In new energy vehicles, it is the core control component of the battery thermal management system and the air conditioning system.

As the automotive industry transitions towards electrification and intelligence, the technical requirements for electromagnetic start valve switches are also getting higher and higher.

This palm-sized component must maintain stable operation under harsh conditions such as extreme temperatures, intense vibrations and long-term wear and tear. Its reliability is directly related to the safety and comfort of the entire vehicle.

03 Industrial chain Synergy: From "going it alone" to "Grouping to Go global" In recent years, with the breakthroughs in domestic auto parts technology, a number of manufacturers like Ningbo Kedong have begun to transform from "low-end contract manufacturing" to "technology export". In the past, domestic auto parts manufacturers cooperated with international giants, mostly producing low-value-added parts such as plastic bumpers and ordinary wiring harnesses, with meager profits and easy replacement. Nowadays, the situation is changing. "We are no longer merely simple parts suppliers, but partners providing technical solutions." David Fang, the general manager of Ningbo Kedong, said.

Nowadays, Ningbo Kedong's starter solenoids have quietly entered many global automotive brands. They may bear labels of different brands, but their cores all come from this Chinese factory.
There are no dazzling advertisements, no consumer brands at the terminal, but whenever you turn the car key and hear that crisp start sound, perhaps there is the presence of Ningbo Kedong.
This is a typical story of Chinese manufacturing enterprises - not pursuing the spotlight on the front stage, but focusing only on the precision and reliability behind the scenes.

04 The future layout will be driven by both electrification and intelligence
Facing the new energy transformation of the automotive industry, Ningbo Kedong has begun to lay out the new generation of electromagnetic start valve switch technology. New energy vehicles have put forward higher requirements for electromagnetic start valves - smaller size, lower energy consumption and faster response.
Lightweighting is also a key research direction. As the requirements for driving range of new energy vehicles are getting higher and higher, reducing the weight of components has become an important issue.

In this regard, there are already successful precedents in the industry. For instance, by optimizing the alloy formula and die-casting process, Haili Magnesium Alloy has developed magnesium alloy frames and shells, reducing the product weight by approximately 25% compared to the initial design and enhancing the impact toughness by over 15%.

Ningbo Kedong is collaborating with material suppliers to develop new lightweight materials suitable for electromagnetic start valves, aiming to achieve the goal of product weight reduction while ensuring performance.

With the expansion of the new energy vehicle market, the global demand for solenoid start valves is increasing at a rate of 15% annually.
"The competition in the future will no longer be about individual products, but about the collaborative efficiency and technological integration capabilities of the entire industrial chain," David Fang concluded. "This requires us not only to do a good job in products, but also to build an open and win-win industrial ecosystem."