36results about How to "Avoid Short Board Effect" patented technology

The invention provides a protective device of a power battery, which solves the problem that the whole battery pack forms a short-board effect because the environmental temperature difference between single batteries causes the effectiveness reduction of single batteries in the process of charging and discharging a battery pack of the power battery in the prior art. The protective device comprises a closed battery box inside which a liquid is contained, wherein the battery pack is immersed into the liquid inside the battery box. The invention also provides a protective method of the power battery, comprising the step of immersing the battery pack of the power battery into the liquid. The protective device or the protective method can equalize the environmental temperature of all single batteries in the battery pack, avoid the problem of the single batteries, prevent the short-board effect, prolong the service life of the batteries and also achieve the effect of fire prevention because of the liquid sealability of the liquid.

The invention discloses a high-stress roadway combined ring beam supporting structure and a construction method thereof, and belongs to the technical field of roadway construction supporting. The supporting structure comprises a roadway and a supporting ring. The homogeneous and isotropous supporting ring is constructed around the roadway, anti-pull anchor rods and slip casting anchor rods of different layers are relatively evenly arranged in surrounding rock, a relatively even steel wire rope net with main rope bodies of steel wire ropes as ribs and a multi-layer tough concrete gunite layer structure passing through a highly dense rock face are pressed below an anchor rod pressing disc of each layer, pressure stabilizing and pressure retaining gunite is applied to evenly gluing disperse and scattered surrounding rock, and the overall mechanical property is relatively even and is greatly improved. The cask effect of supporting is avoided, the overall bearing capacity of the surroundingrock is improved, the anchor rod combination number in unit rock bodies of the surrounding rock is increased, the manner singly depending on the strength of the rock is changed, the strength of the supporting ring is improved, and in combination with gluing of the gunite on the surrounding rock, the mechanical property of the surrounding rock is improved.

The invention provides a gear transmission system design method based on particle swarm two-level optimization. The method comprises the following steps that an optimal objective function is set, an optimal variable to be optimized is set, an optimal constraint is set, and an optimal solution gbest of the optimal variable is acquired through the particle swarm two-level optimization. According to the method, the optimal variable of a gear transmission system is acquired by the adoption of the particle swarm two-level optimization, the first level optimization is focused on meeting the requirement that the standard deviation of safety coefficients of contact fatigue strength of all external gears is small, and acquiring a feasible scheme of the number of gear teeth; and the second level optimization is focused on meeting the requirement that the standard deviation of safety coefficients of bending fatigue strength of all the external gears is small, and acquiring a refinement configuration scheme including all design variables. All strength indexes of the optimal gear transmission system are met, meanwhile, the difference of service lives of all the external gears is relatively small, the problem that short board effect often occurs in the gear transmission system can be avoided effectively, and reliability of the gear transmission system is improved.

The invention discloses a hardware architecture of a photon tensor kernel integrated circuit for matrix calculation and a neural network training method thereof. Based on the photoelectric hybrid coherent detection and electron accumulation principle, an integrated photon dot product calculation unit (hereinafter referred to as DPU) is realized, and the DPU is arranged in an array manner to form large-scale parallelized matrix multiplication calculation hardware, namely a tensor kernel. Through the design of a double-layer fan-in waveguide bus, the interconnection of two-dimensional large-scale DPU arrays is realized. The invention further specifically provides a method for applying the photon tensor kernel integrated circuit to neural network training. According to the invention, high-speed data loading and high-speed matrix calculation are realized, a wooden barrel short board effect caused by mismatching of photoelectric clock rates is avoided, due to the double-layer waveguide busdesign, waveguide crossing loss and crosstalk are avoided; and the hardware architecture can be applied to all algorithms including matrix calculation, including neural network reasoning and training.

The invention provides non-overlapping block and frequency band equivalent fusion combined watermark embedding and extracting methods. The initial values and parameters of a watermark encryption link and a watermark embedding link are generated through the SHA-1 value of a cover image and a secret key given by a user, chaotic mapping is driven to generate a 2-value pseudorandom matrix to encrypt a 2-value watermark and generate random coordinate positions of non-overlapping blocks for an embedded carrier image, 1-level wavelet coefficient Pyramid decomposition is carried out on each random non-overlapping block, frequency band coefficients HL1 and LH1 are fused in an equal weighed manner to form a fusion coefficient, and the quantified value of the fusion coefficient is adjusted to embed a watermark. Watermark embedding and extracting strategies can be disclosed completely; and compared with a traditional disclosed sensitive watermark, the methods of the invention avoid a cast effect caused by that different levels of wavelet coefficients are fused, prevent twice adjustment for watermark extraction via an isolated point filtering strategy, but ensure the sufficiently-high embedded safety level.

The invention provides a flexible sealing structure for underground direct-buried cable or optical cable through-wall and a construction method. The structure comprises a through-wall protection tubeand a flexible sealing assembly arranged between the through-wall protection tube and a cable or an optical cable. The flexible sealing assembly is at least arranged on the upstream face side of the through-wall protection pipe. The flexible sealing assembly comprises a long pipe hoop, a flexible sealing piece located in the long pipe hoop and an end locking gland installed at the end of the longpipe hoop, a flexible sealing piece is arranged between a threaded adjusting check ring arranged in the long pipe hoop and the end locking gland, and the flexible sealing piece and the sealing faces of the through-wall protection pipe and the cable or the optical cable form static sealing. According to the invention, the flexible sealing assembly with a pre-pressing and pre-tightening adjusting mechanism is adopted between the cable or the optical cable and the through-wall protection tube; the functions of radial two-way positioning and axial side two-way positioning are achieved, a sealing ring set in the sealing cavity is made to be in three-way extrusion stress, a static sealing zero space between the through-wall protection pipe and the cable or the optical cable is formed, and therefore, the waterproof sealing effect is achieved.

The invention belongs to the technical field of battery packs, and discloses a rechargeable distributed control battery system, which comprises a battery management system main control unit, a charging and discharging integral interface, a plurality of battery clusters and a plurality of DC-DC bidirectional converter modules, each battery cluster is formed by connecting a plurality of battery modules in series, each battery module is connected with a battery management system slave control unit, each battery module is provided with a DC-DC module, clustering management is carried out by adding the DC-DC module to a single battery module, and the DC-DC bidirectional converter module is externally arranged in a vehicle or a charging station. Meanwhile, the battery pack is provided with a battery management system main control unit, the states of batteries in the battery modules are monitored and predicted in real time, the battery management system main control unit is used for controlling on and off of the DC-DC modules, switching independent control over the single battery modules is achieved, the purpose of higher-granularity fine management is achieved, the availability rate of the batteries is increased, and the influence of battery inconsistency on the operation process is reduced.

The invention discloses intelligent production equipment for building beam columns in the technical field of building beam column intelligent production. The intelligent production equipment comprises a mounting plate and a hydraulic cylinder, the hydraulic cylinder is fixedly arranged on the side wall of the mounting plate through a support, the side wall of the mounting plate is slidably connected with a driving shaft, one end of the driving shaft is fixedly connected to a telescopic rod of the hydraulic cylinder, and a plurality of stepping mechanisms are evenly and fixedly arranged on the outer wall of the end, close to the hydraulic cylinder, of the driving shaft at equal angles through the support around the axis of the driving shaft. The problems that when reinforcing steel bars with the fixed length are adopted for arrangement and bundling, only reinforcement cages with the same length can be produced at a time, pouring needs a certain time, consequently construction efficiency is low, and meanwhile the applicability of the equipment is poor are solved; and secondly, the reinforcing steel bars are placed in the open air in some construction sites, so that the reinforcing steel bars are rusted or polluted by sundries, the reinforcing steel bars cannot be completely and tightly fused with concrete during later pouring, and the problem that the strength of the building beam is reduced is solved.

The invention provides a unidirectional power conversion device provided with a rocking rotary shell and a unidirectional power conversion method. The unidirectional power conversion device comprises a rocking rotary shell supporting shaft, a power output shaft, a first one-way isolator and a second one-way isolator. The device comprises one or more unidirectional power conversion units in mutual combination. Universal rocking power can be absorbed and converted into unidirectional available rotary power. By adoption of the unidirectional power conversion device provided with the rocking rotary shell, the rocking power in all random orientations can be absorbed, and the advantages of high absorption conversion efficiency, low manufacturing and maintenance cost, high stability, wide application range and the like are achieved.

The invention relates to an avoidance system and method for a short plate effect of a battery pack. The battery pack comprises a plurality of electrically connected single batteries, and the avoidancesystem comprises a main control module, an information acquisition module, a bidirectional direct current conversion module and a power supply module. The power supply module provides direct currentelectric signals. The information acquisition module acquires parameter information of the single batteries and feeds back the parameter information to the main control module. The main control moduleanalyzes the parameter information and then judges the short board battery, outputs a first control signal when the battery pack is in a charging state and the short board battery is fully charged, and outputs a second control signal when the battery pack is in a discharging state and the short board battery is completely discharged. The bidirectional DC conversion module discharges the short board battery when receiving the first control signal, and charges the short board battery when receiving the second control signal. According to the avoidance system, the bidirectional direct-current conversion module is controlled by the main control module to correspondingly charge and discharge the short-plate battery, so that the charging and discharging of the whole battery pack are not influenced, and the endurance of the battery pack is improved.

The invention discloses a lithium ion battery consistence screening method. The method includes concrete steps of allowing standing of a plurality of electric cores of identical specifications in an environment having a constant temperature and enabling the temperature of the electric cores to keep consistent with the environmental temperature; according to uniform charge-discharge requirements ofthe electric cores, performing full charging, complete discharging and full charging again; raising the temperature of an environment cabin into 40+/2 DEG C and allowing standing of the electric cores in the environmental cabin in the above temperature condition; when the electric core temperature is consistent with that of the temperature in the environmental cabin, starting testing on voltage of the electric cores and recording voltage testing data of each electric core; and processing voltage data of all the electric cores and selecting all the electric cores in a specific range for grouping or packing. The invention has beneficial effects that the system performance of a lithium battery can be improved and cask effect due to a problem of consistency among the electric cores can be avoided.

The invention relates to the field of synchronous belts, and provides a high-strength PTFE synchronous belt aiming at the problem that a PTFE coating of the synchronous belt is difficult to be compounded with a tooth cloth layer, the high-strength PTFE synchronous belt comprises a rubber layer, the rubber layer is made of HNBR, a rope is embedded in the rubber layer in the length direction, the surface of one side of the rubber layer is in a continuous wheel tooth shape, the tooth cloth layer and the modified PTFE coating are arranged on the surface, and the tooth cloth layer and the modified PTFE coating are arranged on the rubber layer. And the modified PTFE coating is combined with the tooth cloth layer through a calender. According to the invention, the PTFE coating is modified, so that the PTFE coating can be combined with the tooth cloth layer through the calender. The invention also provides a preparation method of the high-strength PTFE synchronous belt, which comprises the following steps: (1) pretreating the tooth cloth layer by using RFL, pasting the modified PTFE coating on the tooth cloth layer, and compounding through a calender to obtain a composite layer; and (2) combining the composite layer with the rubber layer, and vulcanizing to obtain the synchronous belt.

The invention discloses a consistency screening method for lithium-ion batteries. The consistency screening method for lithium-ion batteries comprises the specific steps that first, a plurality of electric cores of the same type are placed under the same temperature environment in a standing mode, so that the temperature of the electric cores and ambient temperatures are kept in consistent, and then in accordance with the unified battery charging and discharging requirements of the electric cores, full charging, full discharging, and then full charging are carried out on the electric cores; second, the temperature of a environment chamber is increased to 40 DEG C, the electric cores are statically placed in the environment chamber under the temperature condition at the same time, and thena test to the internal resistance of the electric cores is started, and the internal resistance test data of each battery are recorded when the temperature of the electric cores is consistent with thetemperature of the environment chamber; and finally, the internal impedance data of all the electric cores are processed and all the electric cores within a certain range for groups or packages are selected. The consistency screening method for lithium-ion batteries has the beneficial effects that the performance of a lithium-ion battery system is improved and the bucket effect caused by the consistency problem between the electric cores is avoided.

The invention discloses a method for screening the uniformity of lithium-ion batteries. The method comprises the following specific steps of firstly putting multiple same type of battery cores into the environment at the same temperature for standing, keeping the temperature of the battery cores consistent with the environment temperature, and then carrying out full charge, full discharge and fullcharge according to the uniform charge and discharge requirements of the battery cores; secondly, heating an environmental chamber to -5 DEG C and simultaneously standing the battery cores in the environmental chamber under the temperature condition; when the temperature of the battery cores is kept consistent with the temperature in the environmental chamber, beginning to test the capacity of the battery cores and simultaneously recording capacity test data of various battery cores; and finally processing the capacity data of all battery cores and selecting all battery cores within a certainrange to form a group or a pack. The method has the beneficial effects that the system performance of the lithium-ion batteries can be improved through the screening method disclosed by the invention, and the cask effect caused by the problem of the uniformity among the battery cores is avoided.