7results about How to "No explosion" patented technology

This invention discloses an overvoltage protection circuit and multi-stage bypass method for an MMC power module. The circuit includes a bypass switch connected in parallel across the MMC power module. When the capacitor voltage of the MMC power module exceeds a set safety value, the bypass switch closes, bypassing the MMC power module. A thyristor is also connected in parallel across the MMC power module. When the thyristor breaks down due to overvoltage, a reliable short-circuit path is formed, bypassing the MMC power module and stopping the capacitor charging. The breakdown voltage of the thyristor is greater than the set safety value but less than the rated voltage of the IGBT in the MMC power module. This invention, through the double protection of the bypass switch and thyristor, ensures that the IGBT of the power module is not uncontrolled. When the power module is continuously charged, it is reliably bypassed, preventing the IGBT and capacitor from exploding, thus not affecting other power modules and the continued operation of the MMC converter valve flexible DC system, thereby improving system reliability.

The invention discloses a low-impact expandable locking mechanism for an inter-satellite laser communication terminal, and belongs to the technical field of spacecraft precision mechanisms. The mechanism comprises a base unit, a rotary unfolding unit and a memory metal unlocking unit. During locking, the slotted bolt of the memory metal unlocking pipe is connected with a load, and the torsional spring is in a compressed energy storage state. During unlocking, the memory metal pipe is heated to expand to break the bolt; then the torsion spring releases energy to drive the hinge unscrewing piece to rotate outwards and unfold, buffering and positioning are achieved by impacting the silica gel pad, and the whole mechanism is completely separated from the load movement envelope; and the travel switch synchronously outputs an unlocking signal. The memory metal non-explosive unlocking and elastic driving-buffering unfolding combined collaborative design is adopted, the technical effects of extremely small impact, no envelope interference after unlocking, high reliability and reusability are achieved, and the memory metal non-explosive unlocking and elastic driving-buffering unfolding combined collaborative design is particularly suitable for a light and small inter-satellite laser communication system sensitive to impact and strict in view field requirement.

This application discloses a transformer bushing, comprising a conductive rod and a head assembly, a composite insulator, an intermediate flange, and a tail assembly connected in sequence. The conductive rod passes through the head assembly, the composite insulator, the intermediate flange, and the tail assembly in sequence. The oil conservator of the head assembly is fixed to the insulating tube of the composite insulator, the insulating tube is fixed to the intermediate flange, and the intermediate flange is fixed to the oil-insulated tube of the tail assembly using adhesive. The internal pressure of the oil conservator during failure is greater than the internal pressure of the composite insulator during failure but less than the internal pressure of the oil-insulated tube during failure. This solution ensures the structural integrity of the transformer bushing during operation and prevents transformer oil leakage due to bushing damage.

This application discloses a transformer bushing, comprising a conductive rod and a head assembly, a composite insulator, an intermediate flange, and a tail assembly connected in sequence. The conductive rod passes through the head assembly, composite insulator, intermediate flange, and tail assembly in sequence. The oil conservator of the head assembly includes an interconnected cabinet and end caps, with at least one pressure relief device on the end caps. The second end of the cabinet is fixed to the first end of the composite insulator, the second end of the composite insulator is fixed to the first end of the intermediate flange, and the second end of the intermediate flange is fixed to the first end of the oil-insulated tube in the tail assembly using adhesive. The internal pressure of the oil conservator during failure is greater than the internal pressure of the composite insulator during failure but less than the internal pressure of the oil-insulated tube during failure. The solution of this application can ensure the structural integrity of the transformer bushing during operation and prevent transformer oil leakage due to damage to the transformer bushing.

The invention relates to an anti-acupuncture lithium ion battery and a preparation method thereof, and belongs to the technical field of lithium ion batteries, through multi-system collaborative optimization design, an anode is compounded by LMFP and NCM according to a ratio of 6: 4, a cathode is graded by primary and secondary artificial graphite according to a ratio of 7: 3, an electrolyte is matched with a composite lithium salt and a composite additive in a specific proportion solvent, and key process parameters and an N / P ratio of a pole piece are optimized; according to the scheme, the battery has 100% needling passing rate, high energy density, excellent cycle life, good high-temperature stability and high process compatibility, and can be adapted to large-scale mass production of an existing production line.

The invention relates to the technical field of secondary battery polymer electrolyte, in particular to photo-initiated polymerization polyimide-based composite electrolyte slurry as well as preparation and application thereof. The electrolyte slurry is mixed slurry formed by polyamide acid and electrolyte containing ionic liquid; wherein the polyamide acid accounts for 1-30% of the mass fraction of the mixed slurry; the ionic liquid electrolyte is composed of a double-bond ionic liquid compound and metal salt, and the mass ratio of ionic liquid to metal salt is (1.25-15): 1. The ionic conductivity of a polymer electrolyte membrane formed by the slurry is higher than 1 * 10 <-4 > S cm <-1 >, the oxidation potential is higher than 4.50 V, and the thermal shrinkage rate is smaller than or equal to 1.0% after the polymer electrolyte membrane is stood for 30 min at 150 DEG C. The capacity retention ratio of a total battery assembled by the prepared polymer electrolyte is higher than 90% after 100 cycles.

The invention provides bisphenol A type low-molecular-weight polycarbonate polyether polyol and a production process thereof, and relates to the technical field of chemistry and chemical engineering. The production process is carried out in an integrated tubular reaction device, and comprises the following steps: premixing the epoxy compound, CO2, bisphenol A and a catalyst, and feeding the mixture into a reaction pipeline at one time to carry out polymerization reaction. In the polymerization reaction process, slow heating control and gas pressurization compensation are carried out, so that the molecular weight polydispersity index PDI of the bisphenol A type low-molecular-weight polycarbonate polyether polyol does not exceed 1.5, the carbonic ester chain link proportion FCO2 is greater than 55%, and in the Lab color system, the b value does not exceed 0.1. Through the regulation and control process, the problem of yellowing of the product generated in the one-step preparation process of the bisphenol A type low-molecular-weight polycarbonate polyether polyol can be solved, and the production efficiency is high. And the prepared product is narrow in molecular weight distribution, does not generate implosion, has no amplification effect, and is suitable for industrial large-scale production.