71results about How to "Large flow area" patented technology

The invention discloses a cover plate assembly and a battery, and relates to the technical field of batteries, the cover plate assembly comprises a cover plate, a pressing ring and a pole, and the cover plate is provided with a mounting hole arranged in a front-back penetrating manner along the thickness direction of the cover plate; the pole is arranged in the mounting hole in a penetrating manner; the pressing ring is arranged on the front side of the cover plate and sleeves the pole, and the pressing ring is welded and fixed with the peripheral side of the pole; the width of the pressing ring is W, the thickness of the pressing ring is H1, the diameter of the pole is D, and the area of the front end face of the pole is S. By controlling the width W of the pressing ring and the diameter D of the pole, the pressing ring can provide enough welding area, and the welding mark can reach enough connection width, so that stable connection between the pole and the pressing ring is ensured; by controlling the thickness H1 of the pressing ring and the area S of the front end face of the pole, the welding mark can reach enough connection depth, the connection force of the welding mark is improved, and the problem of welding failure of the pole and the pressing ring is effectively avoided.

The invention discloses a battery monomer, and belongs to the technical field of batteries, the battery monomer comprises a battery cell assembly, the battery cell assembly comprises a stacked core body, a first tab and a second tab, the first tab and the second tab are respectively arranged at one end of the stacked core body in a first direction, and the first tab and the second tab are arranged at an interval in a second direction; the first tab is provided with a first end connected with the laminated core body, the second tab is provided with a second end connected with the laminated core body, and the distance D between the first end and the second end is greater than or equal to 5mm and less than or equal to 20mm in the second direction; and in the second direction, the width of the first end is a, the width of the second end is b, the width of the laminated core body is T, and a / T is greater than or equal to 0.35 and less than or equal to 0.48, and / or b / T is greater than or equal to 0.35 and less than or equal to 0.48. According to the invention, the overcurrent area of the first tab and the second tab is increased, the internal resistance of the joints of the first tab, the second tab and the stack core body is reduced, and the charging and discharging energy efficiency of the battery monomer is improved.

The invention discloses a relay, which comprises a shell, a magnetic circuit part, a contact part and a pushing part, and is characterized in that the magnetic circuit part is mounted on the shell and comprises at least two magnetic circuit units; the contact part is arranged on the shell and comprises a movable spring group, a static contact group and a load terminal; the movable spring groups and the static contact groups are arranged corresponding to the magnetic circuit unit, and each movable spring group is provided with a movable contact group corresponding to the static contact group; each movable spring group and the corresponding static contact group jointly form a switch; the movable spring group and the static contact group in each switch are respectively connected with different load terminals, and at least one load terminal is shared by at least two switches and forms a common terminal; and the pushing part comprises a pushing piece accommodated in the shell, the pushing piece and the magnetic circuit unit are correspondingly arranged, and the pushing piece is driven by the corresponding magnetic circuit part to drive the corresponding movable spring group, so that the movable contact group and the corresponding static contact group are closed or opened. By adopting the technical scheme, the occupied space is smaller than that in the prior art for realizing the functions of more than two switches.

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 invention relates to a variable-section spring type current lead which can be applied to superconducting electrical equipment such as a superconducting fan, a superconducting reactor and a superconducting cable and comprises a conductor substrate, a superconducting conductor and a flange cover plate, the flange cover plate is fixedly connected with a shell of a Dewar container, the conductor substrate penetrates through the flange cover plate, the superconducting conductor is located in the conductor substrate, and the superconducting conductor is located in the conductor substrate. One end of the conductor substrate is connected with the current leading-out terminal; the part, located below the flange cover plate, of the conductor substrate is made of a flexible conductive material, the conductor substrate is of a sandalwood-shaped structure, is in a spiral rising conical spring shape when unfolded and is in a disc shape when flattened, and the cone top of the conical spring shape is located on the bottom face of the flange cover plate. The joint of the conductor substrate and the current leading-out terminal is located at the cone bottom edge of the conical spring shape. Compared with the prior art, the invention has the advantages that: under different working conditions, the change of conduction heat leakage and electric loss can be realized by adjusting the length and the cross section, so that the heat loss is minimized under different working conditions.

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 utility model discloses a peripheral heating high-abrasion-resistance corrugated roller, relates to the technical field of corrugated rollers, and aims to solve the problems that most of existing corrugated rollers enter roller bodies through high-heat steam to be heated, the high-heat steam needs to heat far parts for a long time, and near parts and far parts are heated unevenly. Corrugated strips are arranged outside the roller body. The first connecting shaft is arranged at one end of the roller body, and a second connecting shaft is arranged at the other end of the roller body; the first heating channel is arranged in the first connecting shaft, a second heating channel is arranged in the second connecting shaft, a roller cavity is formed in the roller body, the first heating channel and the second heating channel communicate with the roller cavity, a first heating rod is arranged in the roller cavity, and a second heating rod is arranged in the roller cavity. A second heating rod is arranged on one side of the first heating rod, and the first heating rod and the second heating rod correspond to the first heating channel and the second heating channel respectively.

The utility model discloses an aerobic tank structure for preventing suspended filler from floating upwards, which is characterized in that an overhaul well is arranged on the upper surface of an aerobic tank body, a frame intercepting net is vertically arranged at the overhaul well, the lower part of the frame intercepting net extends into the aerobic tank body, a connecting seat is arranged on one side of the lower part of the frame intercepting net, and the connecting seat is connected with one end of a hose; the device is reasonable in structure, gas in the tank body of the aerobic tank moves upwards through the interior of the frame intercepting net and is communicated with the outside atmosphere through the holes of the stainless steel cover plate, and therefore the problem that the air in the tank body of the aerobic tank cannot penetrate through the polyurethane filler, and the air in the tank body of the aerobic tank cannot penetrate through the hole of the stainless steel cover plate can be solved. And the arrangement and installation of the frame interception net and the hose do not need to adjust the configuration of other functional pipeline systems, that is, the original pipeline system is not specially limited, the installation is convenient and fast, and the problem of power consumption is solved.

The present application belongs to the field of medical device technology, and specifically relates to a negative pressure suction sheath. The negative pressure suction sheath includes a sheath tube and a blocking structure. The sheath tube is arranged at the distal end of the negative pressure suction sheath. The distal end of the sheath tube has a passive bending section that can bend following the active bending section of the endoscope. The side wall of the passive bending section is provided with a through-hole, and the through-hole extends along the extension direction of the passive bending section. The maximum depth of the through-hole is less than half of the outer diameter of the passive bending section. The blocking structure is connected to the sheath tube and seals the through-hole; the passive bending section includes an expandable portion arranged radially opposite to the through-hole. When the passive bending section is bent and the side of the expandable portion away from the through-hole is the stretching side, the expandable portion expands outward in a direction perpendicular to the plane where the bending direction of the passive bending section is located. The present application can solve the problem that the stone discharge is not smooth when the distal end of the sheath tube is driven to bend by the insertion part to aspirate the lateral stones.

The present application belongs to the field of medical device technology, and specifically relates to a negative pressure suction sheath. The negative pressure suction sheath includes a sheath tube and a directional expansion structure. The sheath tube is arranged at the distal end of the negative pressure suction sheath. The distal end of the sheath tube has a passive bending section that can bend following the active bending section of the endoscope. The side wall of the passive bending section is provided with a through-hole, and the through-hole extends along the extension direction of the passive bending section. The directional expansion structure is connected to the sheath tube and seals the through-hole; when the passive bending section bends and squeezes the part of the directional expansion structure that seals the through-hole, the squeezed part of the directional expansion structure bulges toward the outside of the through-hole. The present application can solve the problem of unsmooth stone removal when the insertion part is used to drive the distal end of the sheath tube to bend to aspirate lateral stones.

The utility model relates to an oil-submerged pump and a motor connecting seat for the oil-submerged pump. The motor connecting base for the oil-submerged pump comprises a base body, a circuit channel and a plurality of oil way channels, and the circuit channel and the oil way channels are arranged in the base body. Wherein at the first end of the seat body, the plurality of oil way channels are arranged around the periphery of the circuit channel; and at the second end of the seat body, the plurality of oil way channels are converged at one position and are arranged in parallel and at intervals with the circuit channel. The motor connecting base can be suitable for a brand new pump pipe arrangement mode, the overflowing area of an oil way pipe can be effectively increased, the on-way resistance of oil flowing can be effectively reduced, the operation power of the oil-submerged pump can be reduced, the oil-submerged pump can output more oil under the same power consumption, and the circuit pipe can be conveniently maintained and checked.

The utility model discloses a novel tee bend belongs to tee bend technical field has solved the problem that the existing tee bend inside main cooling water and high temperature water pump cooling water direct current cause violent erosion vibration, and this tee bend includes pipeline main part and cooperation pipe, and pipeline main part and cooperation pipe constitute tee bend, and pipeline main part is connected with cooperation pipe inside, and cooperation pipe is installed in the pipeline main part and has cooperation subassembly, and cooperation subassembly includes the jacket assembly, fills the heat conduction block and the nozzle piece, and the pipeline main part inner wall is installed with jacket assembly, and the jacket assembly end is installed with nozzle piece, and the jacket assembly is provided with filling heat conduction block in the cavity of main pipe main part, and the heat exchange efficiency is accelerated.

The utility model discloses a kind of backflow-preventing self-closing check valve, including valve body, the inlet and outlet are opened in the valve body, buffering cavity and installation cavity are arranged in the valve body, the inlet is communicated with the buffering cavity, the outlet is communicated with the installation cavity, the buffering cavity is connected with installation cavity by passageway mouth, further include pressing plate and filter screen bucket, the pressing plate is set in the installation cavity, the pressing plate is used to block the passageway mouth, the filter screen bucket is set in the buffering cavity, the volume of the filter screen bucket is less than the volume of buffering cavity, the bucket mouth of the filter screen bucket is towards the passageway mouth, the bucket bottom and part of lateral wall of the filter screen bucket are medium flow channel.This kind of check valve has following beneficial effects: by adopting the bucket bottom and part of lateral wall of filter screen bucket can be as the passageway of medium flow, can increase flowing area, reduce the probability that foreign matter in medium blocks filter screen bucket, improve the reliability when filtering.

The utility model relates to the technical field of lithium ion batteries, in particular to a battery cover plate and a battery monomer. The battery cover plate comprises a pole, a cover plate body and a connecting piece, the pole comprises a first step part, a second step part, a third step part and a fourth step part of which the cross sectional areas are sequentially reduced; the second step part and the third step part penetrate through the through hole of the cover plate body, and the fourth step part is welded with the hole wall of the welding hole of the connecting piece; the cover plate body is limited between the first step part and the connecting piece; the cross sections of the first step part, the second step part, the third step part and the fourth step part are elliptical or waist-shaped; the cross section area of the fourth step part is not less than 6mm < 2 >. According to the battery cover plate and the battery monomer, the problems that the over-current requirement and the strength requirement cannot be met due to the fact that most of the pole columns of the existing battery cover plate are circular, and the performance of the battery is easily damaged due to riveting vibration due to the fact that the pole columns are connected with the riveting blocks in a riveting manner are solved.

The utility model provides a confluence plate and a battery, relates to the technical field of battery production and processing, and aims to solve the problems of over-welding and the like caused by welding energy concentration due to inflection points and overlapping points in a welding track on the premise of ensuring the welding strength and the overflowing area in the welding process between the battery confluence plate and a roll core. Comprising a confluence disc, a plurality of welding tracks are formed on one side of the confluence disc to be combined with a roll core, the welding tracks are distributed around the confluence disc in an annular array mode, and the welding tracks are in a smooth wavy curve shape.

The utility model provides a universal module high-voltage protection base, which belongs to the technical field of new energy automobile batteries, and is characterized in that on the basis of an original integrated injection-molded high-voltage protection base, the original integrated injection-molded high-voltage protection base is divided into an injection-molded high-voltage protection base body and a connecting piece of which the back is spot-welded with a welding nut; the number and the model of the welding nuts on the connecting piece can be changed according to actual conditions, the problems that an original high-voltage protection base on a new project cannot be used universally, a mold needs to be opened again, the mold cost and the product development cycle time are increased are avoided, meanwhile, the original mold development cost can be shared by the universality of the high-voltage protection base body, and a larger cost advantage is achieved.

The invention provides a bearing and a rotary compressor. The bearing comprises a bearing body and a shaft hole, wherein the shaft hole is formed in the center of the bearing body and penetrates through the bearing body; a spiral groove is formed in the inner wall of the shaft hole; a flexible groove is formed in the end face, facing an air cylinder, of the bearing body and surrounds the shaft hole. And the spiral groove is communicated with the flexible groove. The flexible groove of the bearing is communicated with the spiral groove, the through-flow area between the spiral groove and the flexible groove is increased, the backflow influence of an oil hole of a tool withdrawal groove is reduced, the oil pumping amount of the spiral groove is increased, abrasion of the root of a crankshaft is reduced, the efficiency of a compressor is improved, and the service life of the compressor is prolonged.

The present application relates to the technical field of cooling device, and discloses an intelligent temperature control circulating cooling device for phase modulation camera, which is provided with a circulating water treatment box, when the temperature of the phase modulation camera is low, the circulating water treatment box sends the used cooling water to the cooling plate for secondary use, effectively improving the recycling of the cooling water, when the temperature of the phase modulation camera is high, the air temperature between the phase modulation camera and the cooling plate rises, the first flow groove expands by heat at this time, the second flow groove is driven to move by the lever mechanism when the first flow groove expands, the corrugated structure is in the elongated state at this time, the first flow groove and the second flow groove have the primary cooling water flowing in the inside, the flowing area of the primary cooling water is increased at this time, the flowing area of the secondary cooling water is reduced, which promotes the cooling device to cool the air faster, the cooled air cools the phase modulation camera, and the cooling device adjusts the cooling intensity in time according to the temperature change of the air around the phase modulation camera, realizing the precise distribution of the cooling water.

This utility model relates to the field of hydraulic machinery, specifically to a mechanical pump. A conical filter screen is located at the inlet, providing a large flow area and high interception efficiency, effectively blocking large particles of impurities in the water and preventing them from entering the pump body and causing damage or blockage. When water flows through the filter screen, impurities gradually accumulate on its surface. If not cleaned promptly, this leads to a slower flow rate and increased pressure within the mechanical pump. The microcontroller receives data from sensors, makes judgments, and controls an electric ball valve to open for flushing. Furthermore, the water flow from the flushing inlet drives a flushing turbine, which in turn drives a cleaning brush to clean the filter screen. This invention solves the problems of existing mechanical pumps being prone to clogging, requiring manual cleaning after clogging, which increases water flow resistance, reduces pump efficiency, and can even cause shutdowns.

The application discloses a side push cover plate device, which comprises the following parts: an outer plate structure connected with the outer plate of a ship body in the region; a guide groove cylinder connected with a side push cylinder; a box-shaped shell arranged on the inner side of the outer plate structure and the side of the guide groove cylinder; cover plate blades installed on the mouth of the guide groove cylinder and divided into several pieces according to the curved surface line type of the ship body in the region, which are completely attached to the curved surface line type of the ship body in the closed state and provide flow area for the side push in the open state; an executing mechanism installed on the reinforcing structure of the box-shaped shell, which effectively transmits torque and controls the opening and closing of the cover plate blades; and a locking mechanism installed on the support of the reinforcing structure of the box-shaped shell, which is one-to-one corresponding to the executing mechanism and controls the locking of the opening and closing state of the cover plate blades. The application provides the largest possible flow area for the side push and the largest efficiency of the side push when the side push is used, closes the cover plate to keep the curved surface line type of the ship body continuous and smooth, reduces the ship resistance, lowers the energy consumption of navigation and effectively suppresses the air bubbles at the mouth of the side push tunnel when the side push is not used.

The utility model relates to battery technology field, concretely relates to a battery device, and the battery device includes: first component and second component, welding assembly is arranged between first component and second component, and simultaneously connects first component and second component, welding assembly is provided with a plurality of welding parts in first component, and the difference h between the penetration of adjacent two welding parts has, the range of difference h is between 0.1mm < h < 1.0mm. This embodiment sets up a plurality of welding parts, compared with single area's welding part, can obviously improve the overcurrent area. Moreover, this embodiment carries out the differentiation adjustment to the penetration of adjacent two welding parts, can reduce the conduction efficiency of heat from the deep fusion area to the shallow fusion area, avoids the heat when welding too big, can obviously improve the welding quality and welding strength.

The present application relates to a battery cell, a battery and an electrical device. The battery cell comprises: a housing having a receiving cavity; a battery cell received in the receiving cavity, one end of the battery cell having a pole ear; and a busbar, comprising a busbar body, a bending portion and a connecting piece, the busbar body being arranged at one end of the battery cell having the pole ear and being electrically connected to the pole ear; the connecting piece being arranged on the housing and being electrically connected to the housing; the bending portion comprising a first connecting sub-portion, a second connecting sub-portion and at least two layers of folding sub-portions folded in a Z shape between the first connecting sub-portion and the second connecting sub-portion, the first connecting sub-portion being electrically connected to the busbar body, and the second connecting sub-portion being electrically connected to the connecting piece; wherein the first connecting sub-portion and the surfaces of the folding sub-portions adjacent thereto facing each other are at least partially in contact, the second connecting sub-portion and the surfaces of the folding sub-portions adjacent thereto facing each other are at least partially in contact, and the surfaces of the folding sub-portions of each adjacent layer are at least partially in contact.

The fan impeller comprises a main disc, the main disc is provided with a front wheel disc and a rear wheel disc, the front wheel disc is provided with a front base disc and front fan blades, the front fan blades are bent forwards to form front through holes, the rear wheel disc is provided with a rear base disc and rear fan blades, the rear fan blades are bent backwards to form rear through holes, and the front through holes and the rear through holes are communicated to form air passing holes. The main disc is configured into the front wheel disc and the rear wheel disc, the front wheel disc is provided with the front fan blades which are bent forwards to form the front through holes, the rear wheel disc is provided with the rear fan blades which are bent backwards to form the rear through holes, and when the impeller rotates, the front fan blades supply air to the air outlet of the fan; the rear fan blades generate negative pressure to pump away heat generated by the motor and supply air to the air outlet (play a role in pressurization and heat dissipation), good air supply / pressurization / heat dissipation effects are achieved, meanwhile, due to the fact that the front through holes are communicated with the rear through holes, the overflowing area and the air pressure when the rear fan blades form the negative pressure to supply air forwards are increased, the pressurization and heat dissipation effects are better, and air noise is reduced.

This invention discloses a welding method for current collectors in cylindrical batteries, relating to the field of new energy battery technology. The welding method involves: optimizing welding parameters based on a genetic algorithm to find the optimal combination of welding parameters, and then performing welding using the current combination of welding parameters; planning and setting the path during the welding process based on a path planning algorithm, allowing the current collector to move along a predetermined path during welding; forming a core by winding the positive and negative electrodes and the separator, with the separator separating the positive and negative electrodes to prevent short circuits; an upper tab is provided at the upper end of the core, and a lower tab is provided at the lower end of the core, which are then welded to the upper and lower current collectors. This invention effectively increases the current-carrying area after differentiation; it can still ensure a large effective current-carrying area while avoiding the inner and outer sides; and it can find the optimal combination of welding parameters for welding and find the best welding path for movement, bringing better application prospects.

The utility model relates to the technical field of batteries, in particular to a bridging busbar, a battery module and a battery pack. The two connecting parts are connected to the two sides of the bending part in the extending direction perpendicular to the bending part respectively, each connecting part comprises a first-layer base body connected with the bending part, and at least one connecting part comprises a second-layer base body and a third-layer base body which are stacked with the first-layer base body; the second-layer base body and the third-layer base body are formed by bending the first-layer base body and are respectively positioned on two sides of the first-layer base body, and the second-layer base body is used for connecting a pole of a battery cell. Through the arrangement of the first layer of substrate, the second layer of substrate and the third layer of substrate, the overcurrent area is increased, and the overcurrent capability of the bridging busbar is improved, so that the requirement of a high-rate discharge module is met. Through the arrangement of the first-layer base body and the second-layer base body, the force transmission distance is increased, force attenuation is improved, force buffering can be conducted through the bending part, and the risk that the bending part cracks is reduced.

The present application relates to the technical field of flow distribution disc, and particularly relates to a high-pressure flow distribution disc three-section flow groove anti-cavitation structure, which comprises a flow distribution disc, the flow distribution disc comprises two centrally-symmetrically arranged large waist-shaped grooves, small waist-shaped grooves are symmetrically arranged on the two sides of the large waist-shaped grooves, the small waist-shaped grooves are arranged through the flow distribution disc, three-section flow grooves and a second single-section flow groove are respectively arranged at the two ends of the large waist-shaped grooves, and the two three-section flow grooves are centrally symmetrically arranged; the three-section flow groove comprises three triangular grooves which are completely identical in structure, the three triangular grooves are arranged at equal intervals, and one end of a same circular-arc groove is communicated with the end portions of the three triangular grooves, and the other end of the circular-arc groove is communicated with the large waist-shaped groove. The present application can increase the flow area, reduce the jet velocity, weaken the influence of wall shear force, thereby inhibit vortex production, further inhibit cavitation phenomenon of the flow distribution disc of the axial plunger pump under high-pressure working condition, reduce flow pressure pulsation and cavitation, and improve the efficiency and service life of the axial plunger pump.

The invention provides a circuit breaker single phase and a circuit breaker, is applied to the technical field of medium-voltage complete electric appliances, and aims at a high-capacity horizontal vacuum circuit breaker, and in order to guarantee smooth movement of a moving contact, the moving contact in the circuit breaker single phase is provided with a cylindrical section which is in sliding fit with the end part of a moving end of a shell of a vacuum arc-extinguishing chamber in switching-on and switching-off movement; the first guide supporting structure fixedly connected with the movable wire outlet seat is matched on the cylindrical section, so that the part, extending out of the vacuum arc-extinguishing chamber shell, of the movable contact can be guided and supported; therefore, the technical problem that the moving contact of the existing large-capacity horizontal vacuum circuit breaker is not smooth in movement due to the lack of effective support in the opening and closing movement process is solved.

The utility model discloses a square battery based on side surface connecting piece design. Including cover plate base body, shell and L type connecting piece, cover plate base body both ends are provided with electrode assembly, and electrode assembly includes pressboard, insulating plate and rivet, and the rivet is in proper order from below to above and is fixedly connected with pressboard and is penetrated through cover plate base body, insulating plate and pressboard, L type connecting piece includes horizontal plate and vertical board, and horizontal plate is parallel to cover plate base body and is connected with the lower part of rivet, and vertical board is along the direction of perpendicular and is away from cover plate base body extension, be provided with roll core in the shell, and roll core adopts full tab winding, and forms tab on both sides of roll core and is fixedly connected with the vertical board of L type connecting piece. Through setting up L type connecting piece, save the inside space of shell, and full tab winding forms tab on both sides of roll core and is connected with the vertical board of L type connecting piece, increase the connecting area of vertical board of L type connecting piece and then improve current density and rate performance.

The invention discloses a noise reduction control system for a large-air-volume Roots blower, and belongs to the technical field of blower noise reduction. The system comprises an engine, a Roots blower, a transmission assembly, an exhaust and side air supply silencer, a detection assembly and a controller. When the system operates, a main air inlet in the bottom of the Roots blower receives main airflow, a side air supply air inlet in the top of the Roots blower receives secondary airflow through a side air supply silencer, the main air inlet and the side air supply air inlet are matched in the Roots blower, and preliminary noise reduction is achieved. And the air flow after noise reduction is discharged from the air outlet in the top of the fan, enters the exhaust silencer for secondary noise reduction, and is finally discharged from the air outlet of the exhaust silencer. The detection assembly is installed in the pipeline in front of the main air inlet and used for monitoring the air volume. The controller receives the detection data, generates a side air supply control instruction according to a preset rule, and enables an operator to adjust the air inlet opening degree of the side air supply silencer through the man-machine interaction unit. Through fine air volume matching and double noise reduction design, the working efficiency and the noise reduction effect of the Roots blower are effectively improved.

This application provides a battery device, an electrical device, and an energy storage device, belonging to the field of batteries. The battery device includes a control unit and multiple battery cells. The control unit can control the opening and closing of a first switch and a second switch. The first switch connects the first and second terminals of different battery cells, and the second switch connects the first and second terminals of the same battery cell. By controlling the opening and closing of the first and second switches, the battery cells can switch between a first state and a second state. In the first state, the first electrode portion and the second electrode portion are connected in series; in the second state, the first electrode portion and the second electrode portion are electrically isolated. This allows for multiple electrical connection methods between the first and second electrode portions of each battery cell and the first and second electrode portions of another battery cell, thereby expanding the application scenarios of the battery device to a certain extent.