Question Type: Design Support

Q: In an environment of -40°C, the peak starting current of the door lock motor may double. Given the increased ESR (Equivalent Series Resistance) at low temperatures, can the supercapacitor still output sufficient instantaneous current?

A: It can fully meet the requirements. We recommend using a 25F 2.7V supercapacitor. This product has an ESR < 30mΩ at room temperature and an instantaneous discharge capacity of over 15A; even in a -40°C environment, the discharge capacity only decreases by 30%, still stably outputting over 10A of current, fully ensuring normal door lock motor drive and unlocking under low-temperature conditions.

Question Type: Design Support

Q: How much energy is required for a single unlocking action? If supporting 2-3 consecutive unlocking actions is required, is the supercapacitor capacity sufficient?

A: Taking a passenger car as an example, the door lock motor unlocking current is 3.5A, and the single unlocking time is 0.1S. The energy requirement for unlocking two consecutive times is calculated as follows: 12V × 3.5A × 0.1S × 2 times = 8.4J. If the vehicle is equipped with 4 door handles, 4 door locks, and 2 child locks, and calculated with an 80% conversion efficiency, the total energy requirement is: (8.4J × 10 lock bodies) / 80% = 105J. A recommended solution is to use 5 25F 2.7V supercapacitors connected in series. This combination can store the following energy: 0.5 × 5F × (12V² - 9V²) = 157.5J; even if the capacitor capacity decreases by about 30%, it can still ensure at least two normal unlocking attempts.

Question Type: Design Support

Q: After the vehicle has been parked for 2 weeks, will the self-discharge of the supercapacitors prevent the unlocking function from being completed in the event of a collision?

A: There is no need to worry about this. Supercapacitors have fast charging characteristics and can be fully charged in a very short time after the vehicle is started. Taking a 5A charging current as an example, a module consisting of five 25F 2.7V supercapacitors connected in series can be charged from 0V to a full 12V in just 20 seconds, effectively avoiding the risk of supercapacitor self-discharge due to prolonged vehicle parking.

Question Type: Design Support

Q: After the vehicle is powered on, regulations require it to return to an "unlockable" state within xx seconds. Can the supercapacitors charge to the required capacity for unlocking within the specified time?

A: Fully compliant with regulations. Supercapacitors have the advantage of extremely fast charging, quickly charging after the vehicle starts. Taking a 5A charging current as an example, a module of five 25F 2.7V supercapacitors connected in series can be charged from 0V to a full 12V in just 20 seconds, completing the restoration to the "unlockable" state within the regulatory time limit.

Question Type: Technical Principle

Q: If multiple supercapacitors are used in series, will there be an issue of uneven voltage between individual cells? Will this issue affect the reliability of the unlocking action during a collision?

A: The reliability of the unlocking action is fully guaranteed. Before leaving the factory, Yongming supercapacitors undergo 100% capacity and resistance matching testing. Capacitance and ESR tolerances are strictly controlled within 5% to ensure consistent performance of each individual cell. Simultaneously, the actual application circuits are equipped with balancing circuits. When a deviation in the voltage of a single cell is detected, the circuit actively initiates voltage balancing adjustment. Through this dual guarantee of "factory consistency control + active circuit balancing," reliable operation of the series connection is ensured.

Question Type: Design Support

Q: In practical applications, how is the health status of supercapacitors monitored? Which parameters need to be monitored in detail?

A: The charging and discharging characteristics of supercapacitors are almost perfectly linear, making health status monitoring a simple and feasible solution. The specific operation method is as follows: discharge the capacitor through a load, collect the voltage difference within the corresponding discharge range, and then use software logic calculations to accurately monitor the product's health status. The industry-standard lifespan assessment criteria are: capacity decay not exceeding 30% and internal resistance change not exceeding 4 times the initial value; however, the assessment criteria can be flexibly adjusted according to actual operating conditions.

Question Type: Technical Principle

Q: Under extreme conditions such as freezing, jamming, or object trapping, the instantaneous current of the motor can reach tens of amperes. Can the supercapacitor withstand such high current pulses?

A: It can fully meet the requirements. Taking a passenger car as an example, the door lock stall current is typically 7-8A, the child lock stall current is 2-3A, and the door handle stall current is about 10A; while a 25F 2.7V supercapacitor can achieve an instantaneous discharge capacity of over 15A at room temperature. Even in a low-temperature environment of -40℃, after the discharge capacity decreases by 30%, it can still output a current of over 10A, easily handling the high current requirements under stall conditions.


Question Type: Life Cycle

Q: How can you ensure that the supercapacitor meets the vehicle's life cycle requirement of more than 10 years? Are there relevant life cycle data and calculation models to support this?

A: Yongming SDH series supercapacitors are of 85℃ high-temperature resistant specification, fully meeting automotive-grade requirements. Based on a 10-year lifespan target, assuming a 12V power supply system with 5 capacitors operating for 3 hours daily at 45℃, the total operating time is approximately 11,000 hours. According to the supercapacitor lifespan calculation rules (lifespan doubles for every 10℃ decrease in temperature; lifespan increases 1.5 times for every 0.1V decrease in voltage), this capacitor module, operating at 45℃ and a single-unit operating voltage of 2.5V, can achieve a lifespan of 36,000 hours, far exceeding the 10-year design lifespan and fully meeting usage requirements.

Question Type: Technical Principle

Q: What is the core mechanism of supercapacitor capacitance decay and internal resistance increase? How is it related to voltage and temperature?

A: The performance decay of supercapacitors is mainly related to the two core materials: electrodes and electrolyte. During long-term charge-discharge cycles, frequent insertion and extraction of ions into and out of the pores of activated carbon can cause partial collapse or blockage of the microporous structure, hindering ion adsorption and resulting in decreased capacity and increased internal resistance. Simultaneously, voltage and temperature significantly affect the decay rate: voltage is a key influencing factor; the higher the operating voltage, the faster the electrolyte decomposes, and lowering the operating voltage can effectively extend lifespan (every 0.1V decrease in voltage increases lifespan by 1.5 times). High temperatures drastically accelerate electrolyte decomposition and electrode degradation; according to Arrhenius's law, every 10°C increase in temperature halves the lifespan, therefore, a low-temperature operating environment is more conducive to extending product lifespan.

Question Type: Technical Principle

Q: After the vehicle is powered off, will the supercapacitor discharge in reverse to other body modules? Is an isolation device required?

A: This problem can be effectively solved, and an isolation device is necessary. Using a MOSFET unidirectional isolation circuit or a Schottky diode, the supercapacitor can be prevented from being "energy-absorbing" by other body modules; the isolation design will not affect the stability of the emergency unlocking action, ensuring that the unlocking function is not interfered with by the vehicle's electrical grid.

Question Type: Design Support

Q: How safe are supercapacitors? Do their raw materials contain hazardous substances? Are there any special requirements for transportation?

A: Supercapacitors use physical energy storage, involving no chemical reactions, resulting in excellent safety performance. The products leave the factory uncharged, requiring no special transportation certifications. All raw materials used comply with RoHS and REACH environmental certifications, containing no harmful chemicals and causing no pollution to the environment. They are truly green energy products with significant advantages in environmental protection and safety.


Question Type: Design Support

Q: If the main battery is instantly de-energized after a collision, will the electronic door locks fail to open? Will the doors become stuck, preventing occupants from escaping? Is it necessary to rely on supercapacitors to ensure unlocking?

A: There is no need to worry about being trapped. After a vehicle collision causes a power outage, the supercapacitor will act as a backup power source for the door locks, quickly driving the door locks, child locks, and door handle motors in sequence to instantly unlock, ensuring safe escape for occupants. Supercapacitors are the key guarantee for reliable door lock unlocking after a collision.

Question Type: Design Support

Q: If a collision is severe enough to deform the car door, can the supercapacitor still unlock it?

A: Yes. After a collision, the supercapacitor, with its rapid response advantage, can sequentially drive the door lock, child lock, and door handle motor within one second, ensuring the door unlocks immediately and buying precious time for occupants to escape.


Question Type: Performance Comparison

Q: In extremely low temperatures, can the supercapacitor still provide enough energy to unlock the door?

A: Absolutely. Taking a 25F 2.7V supercapacitor as an example, this specification has an instantaneous discharge capacity of over 15A at room temperature. Even in an extreme low temperature environment of -40℃, after a 30% reduction in discharge capacity, it can still output a current of over 10A, which is more than enough to meet the normal driving and unlocking requirements of the door lock motor at low temperatures.


Question Type: Technical Principle

Q: What is the unlocking process of the car door lock after a collision? Is manual operation required?

A: The unlocking process is fully automatic and requires no manual operation. Supercapacitors serve as backup power for car door locks, fully charging in a very short time after the vehicle starts. In the event of a collision, the supercapacitor's rapid response capability allows it to sequentially activate the door locks, child locks, and door handle motors within one second, ensuring immediate door unlocking.

Question Type: Design Support

Q: How can I confirm that the supercapacitor backup power system is always in normal standby mode? How will I be notified promptly if the system malfunctions?

A: In practical applications, the collision module integrates a supercapacitor health monitoring function. This function performs a discharge test on the capacitor under load, collects the voltage difference within the corresponding discharge range, and then uses software logic calculations to monitor the product's health status in real time. If the system malfunctions, it will be promptly reported through the vehicle's relevant control system so that staff can be informed and address the issue.

Question Type: Design Support

Q: If the capacitor is depleted after the vehicle has been parked for a long time, will the unlocking function still work normally?

A: Yes, it will work normally. Supercapacitors have fast charging capabilities and can be fully charged in a very short time after the vehicle starts. Taking a commonly used 25F 2.7V supercapacitor as an example, it only takes 20 seconds to charge from 0V to a full 12V. There's absolutely no need to worry about the capacitor running out of power due to long-term vehicle parking affecting the unlocking function.

Question Type: Life Cycle Type

Q: Does this capacitor require regular maintenance after being installed in the vehicle?

A: No regular maintenance is required. The supercapacitor's charge-discharge cycle life can reach over 500,000 cycles. Based on a 10-year lifespan, its service life far exceeds the product's design lifespan, truly achieving maintenance-free use.

Question Type: Life Cycle Type

Q: Will the supercapacitor suddenly run out of power? Is it prone to aging? Will it fail in critical moments such as collisions?

A: It will not suddenly run out of power and is not prone to aging. It will not fail in critical moments. The supercapacitor's charge-discharge characteristics change linearly, and the power decay process is predictable, preventing sudden power loss. Even if completely depleted, it will be fully charged within seconds of starting the vehicle. Its stable performance ensures reliable operation in critical moments such as collisions, without failure.

Question Type: Safety Concern

Q: Are there any risks of explosion or fire associated with supercapacitors? Are there any safety hazards in the event of a short circuit? Are they safe after a collision?

A: Supercapacitors use physical energy storage methods and do not involve any chemical reactions, resulting in excellent safety performance. They will not catch fire or explode in either short-circuit or collision scenarios, making them a high-quality, green, and environmentally friendly product as a backup power source.