EVLINK Electronic Co.,Ltd Company News

In an electric vehicle (EV), every watt-hour of energy is precious, as it directly impacts the vehicle's driving range. Therefore, any component that can offer inherent energy optimization provides a significant competitive advantage. The self-regulating feature of the High Voltage Positive Temperature Coefficient (PTC) Heater is a critical technical property that contributes directly to reducing energy waste and maximizing the efficiency of the overall EV thermal management system. The key to this optimization lies in the unique material property of the PTC ceramic: its dramatically increasing resistance as its temperature rises. When the heater is cold and first switched on, its resistance is minimal, allowing it to draw maximum current and achieve a rapid initial heat-up—this is the speed benefit. However, as the surrounding coolant or air begins to warm up and the thermal demand decreases, the PTC element’s own temperature rises. This internal temperature increase causes its electrical resistance to climb sharply, which automatically and instantaneously reduces the current draw and, thus, the power consumption. This mechanism provides a passive and continuous form of power modulation:   Elimination of Overshoot: Traditional heaters often overshoot the target temperature because they lack instantaneous feedback, leading to wasted energy that must then be counteracted by a cooling system. The PTC heater, through its self-limiting nature, inherently prevents this overheating, ensuring that the heater only generates the thermal energy absolutely necessary to maintain the set temperature point, thus eliminating energy waste.   Dynamic Matching of Demand: As the EV cabin or battery approaches its target temperature, the thermal load on the heater decreases. The PTC heater automatically senses this change via its own temperature, proportionally reducing its power consumption. In contrast, a simple resistive heater would continue to draw full power until an external control system actively cycles it off. The continuous, proportional reduction in power drawn by the PTC heater is far more efficient than the on/off cycling of other heating types.   System Simplification: Because the heater manages its own temperature, the vehicle's electronic control unit (ECU) has a less complex thermal control strategy. It can rely on the heater's inherent safety and efficiency, reducing the need for complex, energy-consuming monitoring and safety circuits.   By providing highly efficient, on-demand heat that automatically throttles back power once the set point is reached, the High Voltage PTC Heater minimizes unnecessary battery discharge. This direct energy optimization extends the effective driving range of the EV, making it an indispensable technology for manufacturers committed to building the most energy-efficient vehicles possible.

In the context of the highly complex and interconnected thermal management system (TMS) of a modern electric vehicle (EV), the High Voltage Coolant Heater (HVCH) often emerges as the superior and most versatile choice compared to localized or direct heating elements. This is due to its inherent ability to integrate and serve multiple critical heating loads simultaneously and efficiently. The EV TMS is a network, not a set of isolated functions. It must simultaneously manage four key areas: the high-voltage battery pack, the power electronics (inverter, converter, charger), the electric motor, and the passenger cabin (HVAC). A coolant-based system is the most effective way to transfer thermal energy between these components. For instance, in cold weather, heat may need to be generated by the HVCH and distributed to both the battery (for preconditioning) and the cabin (for comfort). Conversely, in warm weather, the system may need to reject heat from the battery and power electronics to the ambient air. The HVCH, by being centrally located within the primary coolant loop, is the ideal tool for generating large amounts of heat and injecting it directly into this distribution network.   Multi-Purpose Efficiency: A single, powerful HVCH unit can satisfy the heating demands of all subsystems. This simplifies the overall system, reducing the number of individual heaters required compared to using separate resistive elements for each component.   Uniform Temperature Distribution: Coolant is a highly effective medium for thermal transfer, ensuring that heat generated by the HVCH is distributed uniformly and precisely across the entire battery pack or throughout the cabin heat exchanger. This uniformity is vital for battery health and passenger comfort.   Heat Pump Synergy: The HVCH is perfectly suited to work as an auxiliary component for high-efficiency heat pump systems. While a heat pump extracts ambient heat, its performance drops severely at low temperatures. The HVCH seamlessly steps in to provide the required supplemental or "boost" heat, ensuring continuous, high-performance climate control without relying solely on the less powerful heat pump during extreme cold.   Our HVCH technology is designed with fluid dynamics in mind, featuring high-flow internal architecture to minimize pressure drop and maximize heat transfer efficiency. The superior choice is a solution that can be seamlessly integrated, precisely controlled, and flexibly deployed to meet the dynamic thermal needs of the entire EV platform. The HVCH, with its coolant-centric design, fulfills this role as the cornerstone of the integrated thermal management system, ensuring peak performance and reliability.

The electric vehicle (EV) industry is currently in a state of architectural transition, with manufacturers increasingly adopting 800-volt (800V) systems alongside the established 400-volt (400V) standard. This shift is primarily driven by the need for faster charging speeds and greater powertrain efficiency. For thermal management components like High Voltage Coolant Heaters (HVCH) and High Voltage PTC Heaters, the ability to operate reliably and efficiently across both these high-voltage architectures is a critical market requirement. Modern coolant and PTC heaters are specifically designed to be highly versatile, supporting both 400V and 800V platforms effectively. The fundamental advantage of operating at higher voltage is the direct relationship between voltage, current, and power. To achieve a high power output (e.g., 7kW) at 800V, the required current ($I$) is halved compared to a 400V system. This reduction in current leads to several system-level advantages for the OEM:   Reduced Wiring Complexity and Cost: Lower current allows for the use of thinner, lighter, and less expensive cabling throughout the vehicle. This saves critical weight and reduces material costs.   Increased Efficiency and Reduced Heat Loss: Power losses in conductors are proportional to the square of the current ($P_{loss} propto I^2$). Halving the current drastically reduces resistive losses in the wiring and components, leading to greater overall system efficiency.   400V Applications: For the established 400V architecture, our heaters are optimized to handle the required higher current while maintaining safety. PTC technology, in particular, is highly reliable under these conditions, leveraging the ceramic's ability to handle high power density while self-regulating temperature. 800V Applications: Our next-generation heaters are engineered to fully exploit the benefits of 800V. This involves specialized high-voltage insulation, more robust isolation mechanisms, and component ratings capable of withstanding the higher voltage stress. The design ensures that the transition to 800V does not compromise the fast heating response or the precise control characteristics our customers expect. Essentially, the best support is provided by heaters that are designed with multi-voltage capability and internal architecture that can be customized for both nominal voltages with minimal change to the core thermal performance. Our focus is on providing a scalable heating solution that allows OEMs to design a vehicle line-up that can utilize either a 400V or 800V system without a major overhaul of the thermal management components, ensuring we are prepared for the full spectrum of current and future EV platforms.

The lifespan and durability of a high-voltage battery pack are paramount to the success and long-term cost of ownership of an electric vehicle (EV). While the battery's primary function is energy storage, its operating temperature is the single most critical factor determining its health. The High Voltage Coolant Heater (HVCH) is a non-negotiable piece of equipment whose primary function, alongside cabin heating, is precisely to protect and extend the life of the battery pack through advanced thermal management. Lithium-ion batteries are electrochemical devices, and their internal chemistry is highly sensitive to temperature extremes. Operating or charging a battery when it is too cold (typically below $10^{circ}text{C}$) can lead to a phenomenon called lithium plating, where lithium ions deposit on the anode surface instead of intercalating into the graphite structure. This is permanent damage that reduces the battery's energy capacity, power capability, and overall lifespan. Conversely, operating the battery at excessively high temperatures accelerates the degradation of internal components, which also leads to reduced life and the risk of thermal runaway. The HVCH serves as the active component to prevent cold-induced damage. Before a drive in cold weather or, crucially, before a scheduled fast-charging session, the vehicle's Battery Management System (BMS) activates the HVCH. The heater rapidly warms the dedicated coolant loop that runs through the battery's thermal management system. This warm coolant quickly and uniformly brings the battery cells up to their optimal operating range, usually between. This preconditioning ensures that the chemical processes inside the battery can proceed efficiently and safely, thus preventing the harmful effects of low-temperature charging and high-power discharge. By consistently maintaining the battery within its "sweet spot" temperature range, the HVCH mitigates the two main thermal culprits of battery degradation—extreme cold and extreme heat (by ensuring that waste heat generated during operation is effectively managed and distributed by the coolant). This precise thermal control, which is only possible with a powerful and highly controllable device like an HVCH, is a direct investment in the long-term health and performance of the most expensive component in the electric vehicle, ultimately protecting the consumer's investment and extending the vehicle's useful life. Our HVCH products are designed with this precise, life-extending performance as their core mandate.

The promise of the High Voltage Positive Temperature Coefficient (PTC) Heater is that it overcomes the limitations of older, resistive heating methods by offering a heating solution that is significantly faster and more consistent. For applications in electric vehicles (EVs), where immediate heat and predictable performance are crucial for both cabin comfort and battery health, this superior thermal performance is a defining factor in its widespread adoption. The answer to whether it truly delivers is a resounding affirmative, rooted in the fundamental properties of the PTC material itself. The Speed of heating is a notable advantage. Traditional resistive wire heaters rely on an external control system and thermal mass to eventually generate and transfer heat. In contrast, the unique ceramic composition of a PTC heater means that when cold, its electrical resistance is exceptionally low. This allows a massive inrush current when the heater is first activated, delivering a powerful burst of heating power right at the start. This rapid initial thermal output is what enables an EV equipped with a High Voltage PTC Heater to warm the coolant—and subsequently the cabin or battery—in seconds, rather than minutes. This drastically reduces the driver's wait time for comfortable air or for the battery to be ready for optimal operation. The Consistency and stability of the heat output are arguably an even greater advantage. Once the PTC element reaches its pre-determined “switch” temperature, its resistance climbs sharply, and the power draw naturally and instantly decreases. The heater then operates in a stable, self-regulated equilibrium, maintaining a consistent surface temperature without the oscillation of a traditional system relying on an external, slow-reacting thermostat. This inherent stability leads to several benefits: it provides a much more uniform and consistent temperature delivery to the coolant loop; it prevents the element from overheating, which enhances safety; and it reduces power consumption once the target temperature is reached, optimizing energy use. Furthermore, the design often allows for the parallel connection of multiple PTC ceramic elements. If one element fails, the others continue to operate, ensuring a high degree of operational redundancy. This distributed, consistent heat delivery, combined with the safety of self-regulation and the speed of the initial power burst, solidifies the High Voltage PTC Heater's position as a superior, high-performance solution compared to legacy electric heating technologies. Our products are engineered to harness these fundamental material properties to their fullest potential, providing reliable and immediate heat on demand.

Modern High Voltage Coolant Heaters (HVCH) are sophisticated pieces of engineering, moving far beyond simple heating coils to become crucial, integrated components within the vehicle’s complex thermal management architecture. For Automotive Original Equipment Manufacturers (OEMs), the appeal of these next-generation heaters lies not just in their function but in the significant design and engineering advantages they offer, which directly translate into better vehicle performance, easier integration, and lower manufacturing costs over the vehicle's lifespan. One of the primary advantages is the superior Thermal Power Density. Modern HVCH units are designed to deliver a high wattage output—essential for rapid heating—from a compact and lightweight package. This is critical in space-constrained EV platforms where every cubic inch and kilogram impacts range and design flexibility. Our heaters, for example, are optimized for flat or modular designs, allowing them to be integrated seamlessly into complex thermal fluid circuits that serve the battery, cabin, and power electronics simultaneously. This multi-purpose integration simplifies the overall system plumbing and reduces the total number of components required. Another key advantage is Voltage Flexibility and Scalability. With the industry transitioning from 400V to 800V architectures, modern HVCH devices are engineered to be easily adaptable to various high-voltage platforms. This scalability allows OEMs to utilize a common component across different vehicle models and powertrains, simplifying the supply chain and R&D efforts. The high-voltage operation itself is an advantage, as it reduces the current draw for a given power output, leading to lighter, thinner, and less expensive wiring harnesses—a significant cost saving. Precision Control and Diagnostic Integration are also vital. Contemporary HVCH systems are not simply on/off switches; they are digitally controlled components, typically communicating via CAN or LIN bus protocols. This enables the vehicle’s central control unit to precisely modulate the heater's power output (often via Pulse Width Modulation - PWM) to match the exact thermal demand. This not only maximizes energy efficiency by preventing overheating but also provides real-time diagnostic feedback, allowing the vehicle to monitor the heater's health and performance continuously. This advanced fault detection capability contributes to the overall reliability and safety of the EV system, which is a non-negotiable for achieving high safety integrity levels (ASIL). Our engineering team focuses on maximizing these control capabilities, providing OEMs with a highly intelligent and adaptable thermal solution that is ready for the future of connected and autonomous electric vehicles.

Safety and reliability are paramount concerns in the high-voltage architecture of an electric vehicle (EV), especially when it comes to components that handle significant power and generate heat. The question of whether High Voltage Positive Temperature Coefficient (PTC) Heaters represent the safest and most reliable heating solution is affirmed by the intrinsic material science and design principles behind the technology. Their unique self-regulating nature fundamentally addresses the primary safety concerns associated with traditional electric heating elements. The most critical safety advantage of a PTC heater stems from its material composition—a doped ceramic. This material's resistance increases exponentially when it approaches a specific "switch" temperature (the Curie point). As a result, the heater's electrical current draw naturally limits itself, preventing the element from exceeding its predetermined maximum surface temperature. Unlike conventional resistive wires that can continue to heat up until failure or until an external thermostat intervenes, a PTC heater self-limits its heat output. This means that a thermal runaway scenario, which is the risk of a component reaching dangerously high, uncontrolled temperatures, is virtually eliminated. This built-in, passive safety feature significantly reduces the complexity and potential failure points of the entire thermal system. Reliability is also significantly enhanced by this self-regulating characteristic. The constant temperature control prevents thermal cycling stress and degradation that would plague other heating elements. PTC heaters are designed for exceptional longevity and can withstand thousands of on/off cycles without a notable drop in performance. Furthermore, in their application as coolant heaters, the ceramic elements are often housed within robust, pressure-tested aluminum casings, providing excellent mechanical protection and electromagnetic shielding, critical for maintaining system integrity within the demanding environment of a high-voltage powertrain. Our manufacturing process adheres to the most stringent automotive safety standards (such as ASIL D), ensuring that every High Voltage PTC Heater meets rigorous quality and performance benchmarks. We integrate advanced features, including specialized insulation and current monitoring, to complement the inherent safety of the PTC ceramic. By providing a heating solution that is intrinsically safe—capable of preventing overheating without reliance on complex, external electronic controls—the High Voltage PTC Heater stands out as the most reliable, fire-resistant, and durable choice for managing the thermal needs of an EV’s cabin and battery pack. This assurance of safety and reliability is essential for automakers seeking to build consumer trust in their high-performance electric vehicles.

The challenge of maintaining electric vehicle (EV) driving range in cold weather is one of the most persistent hurdles to widespread EV adoption. When temperatures drop, two major factors conspire to reduce range: the battery's inherent performance decrease at low temperatures and the energy required to heat the passenger cabin. The High Voltage Coolant Heater (HVCH) is the primary technological solution designed to combat both of these range-limiting effects, serving as a cornerstone of cold-weather EV efficiency. The chemical reactions within a lithium-ion battery slow down significantly in cold conditions, leading to reduced power availability and a dramatic cut in the usable energy capacity—a phenomenon often frustrating to EV owners in winter. The HVCH actively addresses this by preconditioning the battery pack. By circulating warmed coolant through the battery’s dedicated thermal plate or cooling channels, the HVCH efficiently raises the battery temperature to its optimal operating range . This preconditioning must be done rapidly and efficiently to prevent a large initial draw on the battery. Operating at high voltage (e.g., 400V or 800V) allows the heater to deliver several kilowatts of heat quickly, ensuring that the battery is ready to deliver full power and maximum range the moment the vehicle is unplugged and driven. Furthermore, the HVCH manages cabin heating more efficiently than older resistive methods. By integrating with a sophisticated EV thermal management system, the HVCH can often work in conjunction with a heat pump. While a heat pump is highly energy-efficient, its performance drops severely at very low ambient temperatures. The HVCH acts as a powerful auxiliary or supplemental heater, rapidly boosting the temperature when the heat pump is struggling or providing the initial, quick burst of heat for immediate passenger comfort. This synergistic approach allows the vehicle to rely on the most energy-efficient source (the heat pump) whenever possible, but immediately call upon the high-power, reliable heat of the HVCH to maintain comfort without excessively draining the battery. Our expertly engineered HVCH solutions are designed with high thermal power density and precise control features (such as CAN or LIN bus communication) to ensure energy is used judiciously. This level of precision minimizes the power taken from the battery for heating, directly contributing to extending the effective driving range and ensuring a consistent, reliable experience for the driver, even when facing freezing temperatures. The optimization of range through thermal control is not a luxury; it is a fundamental pillar of practical EV design, making the HVCH a non-negotiable component.

The High Voltage Positive Temperature Coefficient (PTC) Heater is a game-changer in electric vehicle (EV) heating systems, offering a distinct blend of rapid heat delivery, superior safety, and efficient energy management. Unlike traditional resistive heaters, PTC technology is inherently self-regulating, a characteristic that translates into significant operational advantages for high-voltage automotive applications, particularly in managing the thermal needs of both the passenger cabin and the critical battery pack. The core of a PTC heater is a specialized ceramic material, typically barium titanate-based, that exhibits a non-linear relationship between temperature and electrical resistance. When the material is cool, its resistance is low, allowing a high current to flow and generate heat rapidly. As the temperature of the ceramic element rises, its electrical resistance sharply increases, which inherently limits the flow of current and, consequently, limits the heat output. This self-limiting mechanism means the heater cannot overheat, even in the event of a system fault or poor coolant flow. This built-in safety feature eliminates the need for many external thermostats and fuses, simplifying the design and making the system exceptionally robust and reliable—a key requirement for high-voltage components operating in harsh automotive environments. For the EV cabin, the fast response time of a High Voltage PTC Heater is a major benefit. In the absence of engine heat, passengers require immediate warmth, and PTC heaters can deliver near-instantaneous hot air or hot coolant, significantly reducing the "time-to-comfort" on a cold morning. This speed minimizes the period where the heater draws maximum power, helping to optimize overall energy consumption. In the context of battery thermal management, the stable, controlled heat provided by a High Voltage PTC Heater is invaluable. Whether directly heating the battery via a dedicated plate or indirectly through the coolant loop, the consistent temperature output helps maintain the battery within its optimal operating window . Keeping the battery warm in cold conditions prevents significant drops in range and power, and more importantly, it protects the battery chemistry from degradation caused by attempting to charge or discharge a severely cold pack. Our manufacturing focuses on optimizing the ceramic formulation and heater design to maximize this efficiency and safety, ensuring that our High Voltage PTC Heaters deliver the best possible balance of performance and reliability for the next generation of electric and hybrid vehicles.

The electric vehicle (EV) revolution is fundamentally changing automotive engineering, with thermal management emerging as a critical factor in performance, range, and battery longevity. At the heart of this challenge is the need for efficient and reliable heating, which is where High Voltage Coolant Heaters (HVCH) play an indispensable role. These advanced heating systems are far more than simple cabin warmers; they are integral components of a sophisticated thermal management network that directly impacts the EV's most vital component: the high-voltage battery. Traditional vehicles generate ample waste heat from the engine to warm the cabin. EVs, however, lack this continuous heat source, forcing them to rely on electric heating. HVCH technology, often leveraging Positive Temperature Coefficient (PTC) materials or high-efficiency heating elements immersed in a coolant circuit, offers a solution that is both powerful and highly controllable. By operating directly from the vehicle's high-voltage battery (typically 400V or 800V), these heaters can deliver significant thermal power—often ranging from 2kW up to 10kW—with very high efficiency. This high-power capability is crucial for rapid heating of the cabin on cold days, a feature that directly contributes to passenger comfort, which is non-negotiable for mass-market adoption of EVs. Beyond cabin comfort, the most significant function of an HVCH is battery thermal preconditioning. Lithium-ion batteries perform optimally within a narrow temperature range, usually between. In cold climates, a battery operating below this range suffers from reduced power output, slower charging rates, and a dramatic drop in available driving range. An HVCH is utilized to circulate warm coolant through the battery pack’s cooling plates, quickly bringing the cells up to their ideal operating temperature before a drive or, crucially, before a fast-charging session. This preconditioning process not only preserves the maximum driving range but also safeguards the battery's health and extends its overall lifespan. Furthermore, the robust design of modern HVCH units prioritizes safety. Incorporating multiple layers of insulation, fault monitoring, and self-regulating characteristics (especially in PTC-based designs), these heaters achieve the highest automotive safety integrity levels (ASIL D), minimizing the risk of thermal incidents. As automotive manufacturers continue to push the boundaries of EV efficiency and reliability, the HVCH stands as a foundational technology, ensuring that high-performance electric mobility is achievable and comfortable in any climate. Our expertise in manufacturing these precise, high-power components ensures that vehicle makers can rely on consistent performance and safety.

At the 2024 Korea Interbattery Exhibition, EVLINK showcased its latest coolant heater for electric vehicle thermal management. EVLINK's series of coolant heaters has already been adopted by major OEMs and battery thermal management integrators across Korea. This event presents an excellent opportunity to discuss thermal management trends and developments with colleagues in the field. EVLINK brought heater samples specifically designed for passenger vehicles, commercial vehicles, and energy storage systems (ESS), offering innovative solutions for thermal management. Additionally, EVLINK has established a dedicated service station in Korea to support heater usage. We welcome you to visit the EVLINK booth and engage with us.    

At the 2023 Frankfurt Exhibition (Shanghai), EVLINK once again became the focal point with its leading electric vehicle thermal management technology. During the event, EVLINK showcased its latest innovative products, including highly efficient PTC heating technology and advanced battery thermal management systems, attracting significant attention and praise from visitors. The EVLINK technical team provided detailed on-site explanations of the features and advantages of their products, engaging in in-depth discussions with industry peers and potential customers from around the world. This exhibition not only highlighted EVLINK's technical prowess in the new energy vehicle sector but also further expanded its influence in the international market, solidifying its position as an industry leader. 4o