199results about How to "Improve flow capacity" patented technology

The invention relates to an optimization method of S characteristics, in particular to an optimization method of S characteristics of a pump turbine. The invention aims to solve the problems of complex S characteristic optimization process and long consumed time in the prior art. During S characteristic optimization, an S characteristic curve of a turbine runner is obtained firstly, then N turbulent flow rods are installed in a vaneless area between a movable guide vane and the runner according to the sudden change of the S characteristic curve, and the turbulent flow rods are arranged on a reference circle with the diameter being Dr. When fluid flows through the turbulent flow rods, water flow at the inlet of the rotating wheel collides with the turbulent flow rods, wake flow formed by collision extrudes inlet backflow vortexes, the shapes of the inlet backflow vortexes are lengthened, the inlet backflow vortexes extend towards the center of the rotating wheel, the size occupied by the inlet backflow vortexes at the inlet of the rotating wheel is reduced, and the inlet backflow vortexes can be improved or restrained. And the flow capacity of the runner is improved, so that the S characteristic of the pump turbine is further improved. The invention belongs to the technical field of water turbine S characteristic optimization.

The invention discloses injection molding equipment and an injection molding method thereof, and belongs to the technical field of injection molding. The injection molding equipment comprises a counter, an injection molding machine and a forming mold, one end of the counter is provided with the forming mold, the other end is provided with the injection molding machine, one end of the injection molding machine abuts against the forming mold, the other end is provided with a hopper, and a heating mechanism is arranged between the two ends; an injection molding machine comprises a first injection molding section, a driving section, a pushing section, a second injection molding section and a nozzle which are sequentially connected and communicated, the nozzle abuts against a forming mold, and a hopper is arranged on the first injection molding section; the injection molding equipment has a very good homogenizing effect on molten plastic, can remove insoluble impurities or incompletely molten raw materials contained in fluid, can play a very good filtering role, avoids blockage, prolongs the service life of the injection molding equipment, improves the production efficiency of the injection molding equipment, and protects the precision and stability of the injection molding equipment.

The invention discloses a battery, an electrochemical device and a power utilization device.The battery comprises a battery cell, and the battery cell comprises a pole piece and a pole lug arranged on the pole piece; the lithium ion battery is characterized in that the negative electrode active material layer of the pole piece contains silicon, the percentage content of the silicon in the negative electrode active material layer is b, and the unit is%; the longest distance between the tab and the end part of the pole piece in the length direction is d, the width of the connecting position of the tab and the pole piece is m, and the units of d and m are the same; b, d and m meet the following relation: # imgabs0 #. By comprehensively controlling the value of # imgabs1 #, not only can the battery with relatively high energy density be obtained, but also the battery can be ensured to have relatively good battery fast charging performance.

The invention provides a pole, a cover plate assembly and a single battery, and relates to the technical field of batteries. The pole comprises a body, the body is provided with a first surface, and the first surface is provided with a tab welding groove; the tab welding groove is provided with a groove side wall, the groove side wall is configured to be in contact with the tab of the single battery, and the plane where the groove side wall is located gradually inclines towards the axis of the pole along the direction far away from the first surface. According to the scheme, the bending angle of the tab when the tab is in contact with the groove side wall can be reduced, so that obvious stress concentration at the bending part of the tab is avoided, and cracks and even fractures at the bending part of the tab can be effectively avoided. Therefore, the structural integrity of the tabs can be ensured, so that the current-carrying capacity of the tabs is improved, the overcurrent capacity between the tabs and the pole columns is improved, and the performance of the single battery can be further improved.

The invention discloses a power semiconductor discrete device and a wafer metallization method thereof. The wafer metallization method is applied to metallization of a wafer in a power semiconductor discrete device. The wafer metallization method comprises the following steps: providing a wafer; the surface of the wafer is provided with windows to be metalized which are arranged in an array; forming at least one metal raw material layer in each to-be-metallized window through a printing process by adopting at least one metal raw material with a preset ratio; after the at least one metal raw material layer is formed through printing, the metal raw material layer is sintered layer by layer so as to form at least one metal layer on the surface of the wafer; wherein each metal layer has a preset thickness. According to the technical scheme provided by the embodiment of the invention, the process for selectively metallizing the wafer in the related technology can be effectively simplified, the metal layer with a relatively thick thickness is relatively easy to prepare, and the heat dissipation and through-current capability of the discrete power semiconductor device can be improved.

The invention provides a connecting piece and a battery. The connecting piece is used for connecting a pole and a tab of the battery and comprises a pole connecting part, a tab connecting part and a fusing part, and the fusing part is connected with the pole connecting part and the tab connecting part and protrudes in the direction away from the pole; the fusing part is provided with a first surface and a second surface which are arranged away from each other, the first surface is located on one side, close to the pole, of the fusing part, and the first surface and the second surface are covered with insulating glue layers. The fusing structure in the connecting sheet provided by the invention can be rapidly fused when the pole group is short-circuited, and the risk of re-connection of the tabs and the connecting sheet is not caused; meanwhile, the boss type fusing structure can meet the design requirements that the overall structure of the connecting piece is simple and flat on the basis that the boss type fusing structure does not make contact with the pole column, the installation space of the pole lug is enlarged, and therefore the over-current capacity of the pole group is improved, and safe use of the pole group is guaranteed.

The invention discloses a field effect transistor, which comprises a drain electrode positioned on a bottom layer; the substrate is located on the drain electrode; the semiconductor layer of the first conductive type is located on the substrate; a source region of the first conductivity type on the semiconductor layer of the first conductivity type; a gate trench extending from the source region of the first conductivity type into the semiconductor layer of the first conductivity type, the gate trench including a gate electrode and a shield gate electrode; the insulating dielectric layer is arranged on the gate trench and the source region of the first conductivity type; a source electrode having a first portion in Schottky contact with the semiconductor layer of the first conductivity type and a second portion in ohmic contact with the source region of the first conductivity type; wherein the semiconductor layer of the first conductivity type is divided into three regions from top to bottom, the doping concentration of the second doped region is gradually changed or uniformly doped, and the doping concentration is higher than that of the other two regions. Distribution of an electric field can be optimized, so that the electric field is distributed in a rectangular shape, voltage resistance of the device is improved, and on resistance of the device is reduced.

The invention provides a main junction modulation fast recovery diode chip and a preparation method thereof, and relates to the technical field of semiconductors. The preparation method of the main junction modulation fast recovery diode chip comprises the following steps: providing an epitaxial wafer, and forming a main junction window and a cut-off ring window on a first surface of the epitaxial wafer by adopting a photoetching process; first nonmetal is injected into the main junction window and the cut-off ring window respectively, and diffusion junction pushing is carried out; forming a field limiting ring window on the first surface of the epitaxial wafer by adopting a photoetching process; and second nonmetal is injected into the main junction window and the field limiting ring window respectively and diffusion junction pushing is carried out so as to realize junction depth distribution of the main junction shallow ring junction depth. According to the preparation method of the main junction modulation fast recovery diode chip, the junction depth distribution of the main junction shallow ring junction depth can be generated on the premise of saving one-time photoetching, the withstand voltage, the through-current capability, the surge level and the preparation efficiency of the main junction modulation fast recovery diode chip can be improved, and the manufacturing cost of the main junction modulation fast recovery diode chip is reduced.

The invention relates to the technical field of new energy, and discloses a battery and a battery pack, the battery comprises: a shell, the shell contains a Ti element, and the mass of the Ti element accounts for more than or equal to 60% of the total mass of the shell; the pole column is arranged on the shell; the battery cell comprises a battery cell body and tabs, the tabs comprise a positive tab and a negative tab, one of the positive tab and the negative tab is electrically connected with the pole, and the other one of the positive tab and the negative tab is electrically connected with the shell; the ratio of the mass of the Ti element of the shell to the total mass of the shell is a, the conductivity of the shell is b, and the lead-out size of the tab from the cell body is c; a. C / b is greater than or equal to 99 and less than or equal to 3650. According to the battery provided by the invention, the relationship among a, b and c is comprehensively controlled, so that the light weight of the shell is realized, the over-current capability of the battery can be met, the battery is prevented from generating relatively large temperature rise, and the condition that the safety performance of the battery is poor is prevented.

The invention discloses an internal thread quick connector and a using method thereof.The internal thread quick connector comprises a body, a mandrel, an outer sleeve, a guide assembly, a tail ring, a nut sleeve, a pressing ring, a front sleeve and a guide sleeve, a first through hole is formed in the body, and a first sealing ring and a first check ring are arranged between the mandrel and the body; the guide assembly is used for limiting the axial relative movement between the main body and the mandrel; a second through hole is formed in the mandrel, and a self-closing valve for closing the second through hole is arranged in the first through hole; the outer sleeve is provided with a first sliding groove, and the tail ring is provided with a limiting shaft which can slide into or be separated from the first sliding groove. A claw is arranged between the mandrel and the nut sleeve, a threaded part is arranged at the front end of the claw, after the threaded part is inserted into the internal threaded part, the main body and the mandrel perform axial relative movement, and the claw is expanded by the mandrel, so that the threaded part is clamped on the internal threaded part. According to the internal thread quick connector and the using method thereof provided by the invention, the on-off of a medium is effectively controlled, and the internal thread quick connector is good in pressure resistance and suitable for being used under the environmental conditions of large drift diameter and high pressure.

The invention belongs to the technical field of high-voltage electric appliance material preparation, and particularly relates to a zinc oxide resistor disc and a preparation method and application thereof. The preparation method comprises the following steps: (1) pre-sintering zinc oxide powder; (2) mixing the zinc oxide powder obtained in the step (1), an auxiliary agent and a dispersion liquid, and carrying out ball milling to obtain slurry; the particle size D50 of the slurry is 0.8-1.2 [mu] m, and the dispersity is greater than or equal to 95%; (3) performing spray drying and granulation on the slurry to obtain granulation powder; (4) carrying out molding and first sintering on the granulated powder to obtain a resistor disc semi-finished product; the first sintering adopts sectional sintering; and (5) forming an electrode layer on at least one surface of the resistor disc semi-finished product by adopting a vacuum sputtering and / or electrophoretic deposition process, and performing secondary sintering and annealing. The contact resistance of the zinc oxide resistor disc is less than or equal to 5m omega; and after 1000 hours of aging in a 85 DEG C + 85% RH environment, the leakage current increase is less than or equal to 2 [mu] A, and the performance degradation rate is less than or equal to 5%.

The embodiment of the invention provides a cover plate assembly and a battery. The cover plate assembly comprises a cover plate main body, a pole and a connecting piece, the cover plate main body is provided with a first through hole, and the first through hole penetrates through the cover plate main body along a first direction. The pole is arranged in the first through hole, the two ends, in the first direction, of the pole extend out of the first through hole, the outer circumferential faces of the two ends of the pole protrude out of the inner circumferential face of the first through hole, one of the two ends of the pole is further provided with a containing groove, and a first limiting part is formed on the side wall, close to the opening, of the containing groove. The connecting piece is arranged in the containing groove and abuts against the first limiting part, and the side face of the connecting piece makes contact with the side wall of the containing groove. The cover plate assembly is used for achieving the effect of improving the over-current capability.

The present application provides a connection structure between a battery pole and a busbar and a battery module, which belongs to the field of battery technology. The connection structure between a battery pole and a busbar includes a battery pole, a busbar and a conductive member. The busbar is welded to the battery pole to form a welding joint, and the busbar and the battery pole are electrically connected through the welding joint. The conductive member is located between the battery pole and the busbar, so that the busbar and the battery pole are electrically connected through the conductive member. The busbar and the battery pole are electrically connected through both the welding joint and the conductive member, so that the current flow area between the battery pole and the busbar includes the conductive member in addition to the welding joint, which greatly increases the current flow area and greatly increases the current flow capacity between the battery pole and the busbar.

The present invention relates to a vacuum arc extinguishing chamber and an arc extinguishing contact thereof. The arc extinguishing contact comprises a conductive rod, a contact piece, and a longitudinal magnetic conductor; a plurality of longitudinal magnetic conductors are provided, and the longitudinal magnetic conductors extend in a circumferential direction of the contact piece in the axial direction of the conductive rod, and each longitudinal magnetic conductor is arranged at intervals in the circumferential direction of the contact piece and has the same rotation direction; the longitudinal magnetic conductor has a conductor contact section for pressing and contacting with the longitudinal magnetic conductors adjacent to the contact piece in the circumferential direction of the conductive rod; the adjacent conductor contact sections on the arc extinguishing contact are in contact when current is flowing, which shortens the flow path, reduces the flow resistance, and improves the flow capacity; when disconnecting, the longitudinal magnetic conductor is reset, and the intervals between adjacent longitudinal magnetic conductors prevent the flow, and the flow path is limited to the extension path of the longitudinal magnetic conductor. Since the longitudinal magnetic conductor extends in a rotational direction, the arc extinguishing contact can ensure the longitudinal magnetic field strength at this time. The arc extinguishing contact of the present invention ensures the longitudinal magnetic field strength and improves the flow capacity by changing the current path.

The present invention relates to the field of charging cable technology, and in particular to a liquid-cooled charging gun cable. It includes an outer cable sheath, wherein at least two charging cores are wrapped in the outer cable sheath, and a cooling tube is sleeved on the outer surface of the charging core, and an insulating coolant can flow in the cooling tube, and the charging core is immersed in the insulating coolant as a whole; the outer surface of the charging core is covered with a metal sintered layer, and the surface of the metal sintered layer is a rough surface. The present invention reconstructs the surface structure of the charging core, and covers the outer surface of the charging core with a metal sintered layer. The metal sintered layer can increase the heat transfer area between the charging core and dimethyl silicone oil, thereby improving the heat exchange effect; at the same time, the metal sintered layer can increase the local turbulence of the dimethyl silicone oil, and the local turbulence can increase the fluidity of the dimethyl silicone oil, thereby further improving the heat exchange effect.

The utility model discloses a single battery and a battery pack. The single battery comprises a shell, a top cover assembly, a battery cell and a connecting piece, the shell is provided with a containing cavity with an opening in one end, the top cover assembly is connected to the shell and seals the opening, the battery cell is arranged in the containing cavity, and the end, facing the top cover assembly, of the battery cell is provided with a tab; the connecting piece comprises a connecting part, the connecting part is provided with a first section and a second section which are connected, the first section is connected with the top cover assembly, the tab is wound on the circumferential outer side of the second section, the second section is provided with an accommodating space, and one end, far away from the battery cell, of the tab is arranged in the accommodating space. Therefore, by utilizing the insertion matching of the accommodating space and the end part of the tab, the winding operation of the tab on the outer side of the connecting part is facilitated, the connection firmness of the tab and the connecting piece can be increased, the contact area of the tab and the electric connecting piece can be increased, and the overcurrent capacity between the battery cell and the electric connecting piece is improved.

This disclosure provides a dust collection device and cleaning equipment, belonging to the field of cleaning equipment. The dust collection device includes a dust cup, a cyclone separator, a shielding member, and a drive motor. The cyclone separator is disposed within the dust cup and has a dust discharge side and a clean air discharge side arranged opposite each other along the axial direction of the cyclone separator. The cyclone separator includes multiple cyclone cones, each of which has an exhaust passage communicating with its interior and facing the clean air discharge side. The shielding member is rotatably disposed on the clean air discharge side of the cyclone separator and configured to selectively close at least a portion of the exhaust passage during rotation. The drive motor is disposed on the dust discharge side of the cyclone separator and is drively connected to the shielding member to drive the shielding member to rotate. The dust collection device and cleaning equipment provided by this disclosure can balance separation performance, flow capacity, structural compactness, and switching reliability.

The present application relates to the technical field of plunger pump, in particular to a variable stroke double cavity plunger pump, which comprises a shell and a driving motor, two delivery pipes are arranged in the shell, two groups of crankshaft assemblies are arranged on the output shaft of the driving motor, the shell is connected with the corresponding delivery pipe through the crankshaft assembly, and a first one-way valve and a second one-way valve are symmetrically arranged in the delivery pipe along the axis of the crankshaft assembly; the one-way valve comprises a reset assembly, a sealing assembly and a clamping assembly arranged in sequence from top to bottom, the sealing of the sealing assembly is realized by the elastic extension of the reset assembly and the adhesion of the clamping assembly; the sealing assembly on the first one-way valve is provided with a first negative pressure assembly, the sealing assembly on the second one-way valve is provided with a second negative pressure assembly, and the first negative pressure assembly and the second negative pressure assembly are oppositely arranged; by arranging the negative pressure disc and the connecting pipe, the stress area of the sealing ball under the negative pressure condition is increased, the opening speed is accelerated, and the fluid passing efficiency is improved.

The present invention belongs to the technical field of cooling circulating water, and provides a filtering system for a cooling circulating water system, including a water pipe, and a plate heat exchanger, a booster pump, a permanent magnetic filtering device, an impurity removal device, and a mixed bed connected in series in sequence through the water pipe; the impurity removal device includes a shell and a filter cartridge, a connecting hole is connected between the shell and the filter cartridge, a diversion groove is connected on both sides of the shell, and a guide orifice plate is arranged between the shell and the diversion groove, and a connecting pipe is connected between the diversion groove and the filter cartridge. This filtering system for a cooling circulating water system can not only improve the water quality and improve the operating efficiency of the cooling circulating water system, but also reduce the maintenance cost and downtime caused by problems such as equipment corrosion and blockage, and improve the safety of the overall equipment.

The invention discloses a bionic water pump and a combined biofilm formation inhibition method thereof in the technical field of hydraulic engineering and municipal engineering, a plurality of bionic shark fins are arranged on the surface of a water guide cone of a pump device at intervals, each bionic shark fin comprises a bottom surface connected with the water guide cone, and a bionic shark fin water inlet edge and a bionic shark fin water outlet edge are arranged in the downstream direction; the surfaces of the blades and the guide blades are respectively provided with a placoid scale structure along the flow line direction of water flow, each placoid scale structure comprises a pair of auxiliary teeth which are symmetrically arranged, main teeth are arranged between the auxiliary teeth, and the main teeth and the auxiliary teeth are fixed on the surfaces of the blades and the guide blades through bases. A biological membrane on the inner surface of the pump is effectively removed through the scouring structure on the surface of the bionic water pump, adhesion is not prone to occurring, the anti-fouling capacity of the water pump in a fresh water body is improved, and safe and efficient operation of the water pump is guaranteed.

A high-performance clamping piece type auxiliary switch belongs to the technical field of auxiliary switches. The front mounting plate, the front cover plate, the plurality of same base plate units, the rear cover plate and the rear mounting plate are sequentially connected through long countersunk screws, the driving shaft simultaneously penetrates through the middle parts of the front mounting plate, the front cover plate, the base plate units, the rear cover plate and the rear mounting plate, and each base plate unit comprises an upper base plate and a lower base plate which are the same; each substrate is provided with two movable contact pieces, two static contact pieces and a shaft gasket, a magnetic block mounting groove is formed in the middle of each substrate, a magnetic block is arranged in the magnetic block mounting groove of the upper substrate of each substrate unit, and the four movable contact pieces and the two shaft gaskets of each substrate unit are riveted together through brass rivets. According to the utility model, the through-current capability and the on-off instant stability of the contact can be effectively improved, the magnetic blow-out function and the 360-degree time sequence switching capability are high-efficiency, and the accurate indication function is also realized.

The present invention discloses a board-to-board connector, wherein the socket connector includes a socket body and a socket terminal, the socket body is provided with two side walls, two end walls connecting the two side walls, and a slot surrounded by the side walls and the end walls, the socket terminal is provided with a fixing portion fixed to the side wall and a U-shaped contact portion extending from the fixing portion into the slot; the plug connector includes a plug body with two side wall portions and a plug terminal, the plug terminal is provided with an inner wall contact portion located on the inner wall of the side wall portion and an outer wall contact portion located on the outer wall of the side wall portion, and the U-shaped contact portion contacts the inner and outer wall contact portions simultaneously. The socket terminal is provided with a first welding portion located at the bottom of the U-shaped contact portion, and the plug terminal is provided with a second welding portion located at the bottom of the inner wall contact portion. When the socket connector is matched with the plug connector, the first welding portion, the U-shaped contact portion, the inner wall contact portion and the second welding portion jointly form a flow path, and the maximum current conducted by the first welding portion, the U-shaped contact portion, the inner wall contact portion and the second welding portion are 20A, so that the overall impedance is small, which is conducive to improving the flow capacity.

This utility model proposes a cylindrical secondary battery, including a positive electrode current collector and a negative electrode current collector. The positive electrode current collector includes a disk body and a tail body. The disk body is provided with multiple positive electrode welding areas. The area of ​​the disk body is S1, and the sum of the areas of the multiple positive electrode welding areas is S2. 100 12%S1≤S 100 ≤24%S1; The negative electrode current collector is provided with multiple negative electrode welding areas, and each negative electrode welding area is provided with multiple negative electrode solder marks. The area of ​​the negative electrode current collector is S2, and the sum of the areas of the multiple negative electrode welding areas is S. 200 Among them, 10%S²≤S 200 ≤20%S2. This utility model, by setting a positive electrode welding area and a positive electrode solder mark on the positive electrode current collector, and setting a negative electrode welding area and a negative electrode solder mark on the negative electrode current collector, and by reasonably setting the area of ​​the positive electrode welding area and the negative electrode welding area, can take into account the battery's overcurrent capacity as well as the battery's processing quality and processing efficiency, thereby effectively improving the overall performance of the battery.

The application belongs to a valve structure, and aims at the technical problem that the existing electromagnetic valve for satellites is difficult to balance in response speed, power consumption, weight, environmental adaptability and long-term reliability, and provides a special medium axial flow self-locking electromagnetic valve for satellites, which adopts open coil, close coil and permanent magnet cooperation to drive the axial movement of armature, and keeps the valve open or closed after power off, so as to reduce the continuous power consumption and improve the reliability in satellite application. The axial flow fluid channel is formed through the internal channel of the framework, the peripheral channel of the armature and the internal channel of the valve seat assembly, so as to reduce the flow resistance and improve the medium flow capacity. The valve core and the valve seat assembly sealing surface are coaxially matched, the pre-tightening and buffering effect of the elastic member are beneficial to improve the sealing stability, reduce the impact wear and prolong the service life.

This invention discloses a method for evaluating the multi-dimensional coupling aerodynamic performance of a modal selector valve and an engine, belonging to the field of aero-engines. The steps are as follows: establishing a three-dimensional model of the modal selector valve; simulating the model to obtain its flow performance; establishing a computational model of the modal selector valve and calculating the total pressure after the valve; integrating a high-fidelity characteristic calculation model of the component with a zero-dimensional model of the entire engine; inputting the engine's design point performance parameters and performing design point calculations; given the engine control law and the engine's non-design point operating conditions, performing calculations; determining the convergence of the computational model; obtaining the engine characteristic diagram and aerodynamic performance under arbitrary operating conditions, thus obtaining the aerodynamic performance results considering the overall coupling effect of the modal selector valve and the engine. This invention solves the problems in existing technologies where the calculation accuracy of the overall performance calculation code for variable cycle engines cannot meet the design requirements of variable cycle engines, and the coupling of various engine components is poor.

The application provides a battery device, an electric device and an energy storage device. The battery device comprises a box body and a soft package battery cell. The box body comprises a support plate and a frame. A plurality of soft package battery cells are stacked in a first direction. The soft package battery cell comprises a first surface and a second surface, a plurality of first surfaces are oppositely arranged along the first direction, and the support plate is oppositely arranged with a plurality of second surfaces along a second direction. The soft package battery cell comprises a packaging bag, an electrode assembly, an electrode terminal and a first insulating piece, the electrode assembly is provided with a tab portion at the end thereof along a third direction, the electrode terminal is welded with the tab portion and forms a first connecting portion, the area of the first connecting portion is 20mm 2 to 60mm 2 , the first insulating piece surrounds the electrode terminal and is arranged between the electrode terminal and the packaging bag, the first insulating piece is sealingly connected with the packaging bag and forms a second connecting portion, and the minimum distance between the first connecting portion and the second connecting portion along the third direction is 2mm-7mm.

The invention discloses a rainwater inspection well flow field analysis optimization model based on FLUENT and application of the rainwater inspection well flow field analysis optimization model. According to the model, a rainwater inspection well circulation model is established, an inner flow channel structure of the rainwater inspection well circulation model is extracted, grid division is carried out on an inner flow channel, grid quality is detected, the divided grids are imported into FLUENT software, a turbulence energy model and a flow state model are loaded, boundary conditions are set, and water and gas distribution in an inspection well and a pipeline system is defined. Initializing setting, setting a solving step length and iteration precision, carrying out solving calculation, setting parameters, monitoring a flow field characteristic cloud picture, and checking a flow field distribution condition. According to the rainwater inspection well flow field analysis method based on FLUENT, overall simulation analysis of the rainwater inspection well and a pipeline system can be achieved, the change condition of the internal flow field can be accurately reflected, the rainwater inspection well prepared according to the model in an optimized mode can effectively improve the overflowing capacity of the inspection well, the risks of water flow blocking and overflowing are reduced, and the rainwater inspection well flow field analysis efficiency is improved. And head loss caused by an adverse flow state is reduced.

The application belongs to the technical field of batteries, and discloses a battery cover plate and a battery. The battery cover plate comprises a cover plate body and a pole module. The cover plate body comprises a mounting plate body, an extension plate body and a protection plate body. The two sides of the mounting plate body are provided with inclined extension plate bodies. The low end of the extension plate body is connected with the mounting plate body, and the high end is connected with the protection plate body which is parallel to the mounting plate body. The junction and the middle part of the mounting plate body and the extension plate body are provided with protection bosses. The installation part is formed between the adjacent protection bosses. The protection boss is a hollow boss structure. The pole module is insulatedly connected in the installation part and on the extension plate body. The part of the pole module which is located outside the cover plate body is lower than the protection plate body. By making the part outside the pole module lower than the protection plate body, the space outside is reduced to improve the battery module assembly rate, and the damage caused by knocking is avoided. The space inside the protection boss and below the extension plate body is utilized to increase the volume of the pole group to improve the battery capacity. The multi-pole structure effectively improves the overcurrent capacity.

The invention discloses an SIC-based laminated busbar of an SVG product, which comprises an upper circuit board and a lower circuit board, the copper clad thickness and width of copper foils of the upper circuit board and the lower circuit board are determined according to current design requirements, and a high-voltage insulating layer is naturally formed by an epoxy board between the upper circuit board and the lower circuit board. And the hardness support is realized by the epoxy plate. Compared with a laminated busbar formed by pressing multiple layers of copper plates, the laminated busbar required by the invention is simple and efficient in design and processing by utilizing a mature process for processing an existing circuit board, and the cost of the laminated busbar can be greatly reduced; according to the laminated busbar, the high-frequency current skin effect can be better utilized, the current transmission efficiency is improved, and the related through-current capability can be doubled due to the fact that the double-copper-foil parallel conductive mode is adopted in the middle layer.

The utility model provides a battery cell and a battery, and relates to the technical field of batteries. The battery cell provided by the utility model comprises a pole piece, tabs and a diaphragm, the pole piece comprises a positive pole piece and a negative pole piece, the diaphragm is arranged between the positive pole piece and the negative pole piece, and the tabs can comprise a positive tab and a negative tab which are positioned on the same side of the pole piece; the positive plate comprises a composite current collector, and the tab comprises at least two metal sheets; the at least two metal sheets are connected to the edges of the two sides of the composite current collector respectively; at least partial areas of the at least two metal sheets are mutually welded to form a welding area, so that the contact area between the pole piece and the tab is increased, the overcurrent capability between the pole piece and the tab is improved, the poor comprehensive performance of the battery cell is improved, the temperature rise at the tab is prevented from being too high during charging and discharging, and the tab is prevented from being easily fused and the battery is prevented from being on fire.