181 results about "Burst pressure" patented technology

The invention relates to an angular, in particular rectangular, bursting disc (1) made of a sheet metal, with an edge region (11) with which the bursting disc (1) can be attached to an opening of a container or a pipe, and with a central region (12) with which the opening can be sealed up to a bursting pressure, and with predetermined breaking lines along which the bursting disc (1) tears open when the bursting pressure is reached, so that the central region (12) opens completely or partially, wherein the bursting disc (1) has a fold in the edge region (11) which has a first, folded part of the sheet metal and a second part of the sheet metal to which the folded part is parallel or predominantly parallel.

The invention provides a construction method of a non-coupling blasting explosion load model and related equipment, and the method comprises the steps: describing non-coupling blasting explosion loads at different time stages through piecewise functions, and building a non-coupling blasting explosion load theoretical model; a pressure-time curve is collected through a non-coupling bursting pressure test, waveform analysis is carried out, and mechanical parameters are obtained; calibrating various parameters in the non-coupling blasting load theoretical model through mechanical parameters; various parameters in the non-coupling blasting explosion load theoretical model are input into a calculation program for calculation, and a non-coupling blasting explosion load model is obtained; the model provided by the invention can more accurately describe the action characteristics of the non-coupling blasting load, the peak values and the loading rates of the blasting shock waves and the blasting gas are directly controlled by respectively inputting the peak values and the rising time, so that the dynamic response of the structure under different peak values and loading rates can be conveniently researched, and the model has the advantages of simple model, high reliability and the like. The input parameters are few, and the applicability is wide.

The invention provides a fire extinguisher tank bursting pressure prediction method and system. According to the method, a micro-deformation sequential sequence and a pressure gradient value of the surface of the fire extinguisher tank body under high pressure are collected, and a deformation displacement field matrix is generated through optical flow analysis so as to quantify the deformation rate; a laser holographic interferometer is deployed on a pressurization test bench, laser phase parameters are dynamically adjusted based on the deformation rate, matched holographic interference fringes are output, and a deformation evolution topological graph is constructed through fringe phase changes; identifying a deformation rate abnormal fluctuation mode in the topological graph, and associating the pressure gradient value to generate a deformation pressure association tensor; acquiring a deformation propagation path and a stress concentration trend based on the tensor, and simulating a critical fracture pressure value and a potential fracture position; and integrating results to form bursting pressure risk output. According to the invention, millisecond-level accurate prediction of the submillimeter-level fracture position is realized, the burst pressure risk assessment precision is improved, and the test cost is reduced.

The invention discloses a high-pressure expansion device for tunnel rockburst prevention and control and a construction method of the high-pressure expansion device, and belongs to the technical field of tunnel construction process equipment and construction processes. According to the high-pressure expansion device for rock burst prevention and control in the tunnel construction period and the construction method of the high-pressure expansion device, the structure is relatively simple, pressure relief treatment can be effectively conducted on tunnel rock burst high-risk areas, and rock burst is reduced or even prevented. The high-pressure expansion device comprises a shell structure, a control assembly and an expansion reaction generator, the control assembly and the expansion reaction generator are both arranged in the shell structure, and the expansion reaction generator starts to react to generate high-pressure gas under the control of information, obtained by the control assembly, of deformation of tunnel rock mass along with tunneling. And the high-pressure gas is used for breaking the tunnel rock mass according to the set bursting pressure to release stress to control rockburst.

The invention provides a machining method for a top cover with an integrally-formed anti-explosion valve. The machining method sequentially comprises the following steps that S1, raw materials of the top cover are prepared; s2, stamping on one surface of the top cover through stamping equipment to form a circle of indented explosion-proof valve; s3, the top cover semi-finished product with the anti-explosion valve is cleaned through cleaning equipment; and S4, the cleaned semi-finished top cover is subjected to short-time annealing treatment through annealing equipment. Through short-time annealing treatment, the materials at the nicks can be recrystallized and softened, the structure is more uniform, the structures of other parts of the top cover are kept unchanged, and the bursting pressure value is reduced and more stable on the premise that the overall strength of the top cover is not changed.

The present invention belongs to the field of nuclear power maintenance technology, and specifically relates to a high-temperature bursting pressure control system and method for pipes. The high-temperature bursting pressure control system for pipes comprises: a high-temperature device for heating the pipe to be tested, a cooling device for cooling the liquid flowing out of the pipe to be tested; a hydraulic pressure device for adjusting the hydraulic pressure in the pipe to be tested, a pressure sensor for detecting the pressure value of the liquid in the pipe to be tested, a temperature sensor for measuring the temperature of the high-temperature device, and a control device; the control device obtains a pressure value from the pressure sensor and a temperature value from the temperature sensor; the control device is also connected to the hydraulic pressure device, and when the control device determines that the obtained temperature value does not reach a preset temperature value and the obtained pressure value does not meet the preset conditions, the control device controls the hydraulic pressure device to adjust the hydraulic pressure in the pipe to be tested until the pressure value obtained by the control device meets the preset conditions, and the pressure test of the embodiment of the present disclosure is more accurate and safe.

The utility model belongs to the technical field of lithium batteries, and discloses an anti-explosion valve structure, a top cover and a battery. The anti-explosion valve structure is arranged at a pressure relief opening of the battery and comprises an anti-explosion piece, a nick groove, a buffering convex rib and a welding outer ring are sequentially arranged on the anti-explosion piece from inside to outside in the radial direction, when the internal pressure of the battery exceeds a preset value, the anti-explosion piece is broken from the nick groove, the buffering convex rib is arranged on the surface of the anti-explosion piece in a protruding mode, and the welding outer ring is welded to the anti-explosion piece. The buffering convex rib is arranged in the nick groove in a surrounding manner, and the welding outer ring is configured to be fixedly connected to a top cover plate of the battery in a welding manner. Through the arrangement, residual stress generated in the welding process can firstly pull the buffering convex rib, so that the buffering convex rib deforms to reduce the influence of the residual stress on the nick groove, the buffering convex rib plays a role in buffering pressure and releases the residual stress, and therefore the weak nick groove can be prevented from cracking, and the welding quality is improved. Therefore, the stability of the bursting pressure of the nick groove is kept, and the use safety of the top cover and the battery can be improved.

A downhole well tool includes a tubing including a circulation fluid pathway, a first packer, and a second packer positioned longitudinally apart from the first packer. The well tool includes a circulation sub connected to the tubing on a first longitudinal side of the second packer, the circulation sub including a first circulation port to fluidly couple the circulation fluid pathway to an annulus of the wellbore, and a plug seat positioned in the fluid circulation pathway. A second circulation port in the tubing is positioned longitudinally between the first packer and the second packer, and fluidly couples the circulation fluid pathway to the annulus of the wellbore between the first packer and the second packer. The second circulation port includes a frangible cover that plugs the second circulation port and ruptures in response to a burst pressure in the circulation fluid pathway.

The invention discloses blasting depressurization experimental equipment and method for an oil and gas conveying composite pipe. The blasting depressurization experimental equipment comprises composite pipe adapters, experimental medium injection systems, dual-mode blasting devices, discharge pipes and controllers, wherein the two ends of the composite pipe are each provided with a composite pipe adapter; the damage condition of the composite pipe under rapid pressure reduction in the pipe can be analyzed, the bursting pressure load of the pipe is converted into the bursting load of the bursting disc, rapid and instant leakage of a medium in the pipe can be simulated on the premise that the composite pipe is not damaged, the device is closer to engineering practice, and the device is simple in structural process and convenient to operate. And the collapse critical pressure of the lining layer of the composite pipe under different discharge apertures can be directly obtained.

The utility model discloses a blast hole plugging dust fall structure based on blasting pressure atomization, which relates to the technical field of mine blasting related equipment and comprises a bottom cavity seat, a stabilizing component is slidably connected to the upper end of the bottom cavity seat, a dust fall mounting cavity is arranged at the upper end of the stabilizing component, and blasting hole cavities are uniformly distributed on one side of the dust fall mounting cavity. Each stabilizing assembly comprises a cavity supporting base slidably connected to one side of the bottom cavity base, long grooves are formed in the top faces of the cavity supporting bases, rotating rods are rotatably connected to one sides of the cavity supporting bases, long supporting blocks are slidably connected to inner cavities of the two long grooves, stabilizing plates are arranged at the tops of the long supporting blocks, and rubber pads are arranged on one sides of the inner walls of the stabilizing plates. According to the arrangement, the dust fall mounting cavities with different widths can be conveniently and stably mounted through the stabilizing assemblies, so that the dust fall mounting cavities are prevented from shaking constantly in the process of moving the dust fall mounting cavities, the situation that explosive, blister mud and other components are prone to impacting the cavity wall of the device and even damage the blister mud is prevented, and the safety performance of the device is improved.

The invention discloses a calculation method for predicting hydraulic fracturing bursting pressure of any inclined shaft of a marine hydrate reservoir, which comprises the following steps of: establishing a three-way main stress calculation model under an original ground stress coordinate, and performing stress transformation to obtain a ground stress characterization relation of any point on the wall surface of a shaft; on the basis of the stress superposition principle, the in-situ stress, the liquid injection pressure and the percolation pressure are superposed to obtain a stress distribution calculation model of any point around the wall of any inclined shaft, and the three-direction principal stress under the polar coordinate system of the inclined shaft is calculated; establishing a fracture pressure calculation model for predicting hydrofracture of the marine hydrate reservoir; and calculating the fracture pressure of the marine hydrate reservoir by adopting a numerical calculation method, an iterative calculation method and an iterative algorithm. By means of the method, quantitative prediction of the hydrofracture bursting pressure of any inclined shaft of the hydrate reservoir is achieved, the technical blank of predicting the hydrofracture bursting pressure of any inclined shaft of the marine hydrate reservoir is filled up, and technical support is provided for correctly designing and smoothly implementing marine hydrate reservoir yield increasing modification measures.

The invention discloses a battery anti-explosion valve plate and a manufacturing method thereof. The manufacturing method comprises the following steps: taking a material of which the mechanical property meets requirements as an anti-explosion valve base material; an anti-explosion valve plate with anti-explosion nicks is obtained on the anti-explosion valve base material through stamping; and the anti-explosion valve plate is subjected to annealing treatment. According to the anti-explosion valve base material, material selection is conducted on the anti-explosion valve base material according to the force performance, the crystal structure of the anti-explosion valve plate in the area where the anti-explosion nicks are located is changed through annealing, grain size distribution is made to be uniform, the stress and hardness of the anti-explosion valve plate in the anti-explosion nick area are reduced, fluctuation of the bursting pressure of the anti-explosion valve plate can be reduced, and the anti-explosion valve plate has the good anti-explosion performance. And the anti-exposure valve plate reaches a stable explosion value.

A cover plate and a battery. The cover plate comprises a cover plate body (1) and an explosion-proof valve, the explosion-proof valve is arranged on the cover plate body (1), and the explosion-proof valve is formed of an explosion-proof notch (2) formed in the cover plate body (1); the tensile strength of the cover plate body (1) is c, the yield strength of the cover plate body (1) is d, the burst pressure of the explosion-proof valve is e, and the proportion of the area of the explosion-proof valve to the surface area of the cover plate body (1) is f, wherein the following relational expressions are satisfied: (I) and (II). The strength of the cover plate is represented by the tensile strength c and the yield strength d, the safety performance of the cover plate is represented by the burst pressure e of the explosion-proof valve and the proportion f of the area of the explosion-proof valve to the surface area of the cover plate body (1), and the ratio of the strength performance to the safety performance is controlled, so that when thermal runaway occurs in a battery, it is ensured that the cover plate cannot break and the explosion-proof valve can be opened in time.

The invention discloses a quantitative expression method for pipe explosion characteristics. The method specifically comprises the following steps: step 1, deducing and establishing an analytical model of pipe explosion pressure drop generated during pipe explosion of a pressure pipeline; 2, deducing and establishing an analytical model of steady-state pipe explosion pressure and pipe explosion amount; and 3, determining main parameters for quantitatively expressing pipe explosion characteristics according to the analysis model of the pipe explosion pressure drop, the steady-state pipe explosion pressure and the pipe explosion quantity. The method has the advantages that the analytical models provide a theoretical basis for accurately describing key parameters in the pipe explosion process, so that the research on the pipe explosion phenomenon is deeper and more accurate; main parameters influencing the pipe explosion characteristics are determined by solving analytical solutions obtained by the analytical models, a direction is pointed out for subsequent analysis and research, and the main parameters quantitatively expressing the pipe explosion characteristics are applied to the calculation process of the pipe explosion characteristics of the real-time detection and positioning method based on transient monitoring data. And the accuracy and the reliability of real-time detection, positioning and diagnosis can be further improved.

The present application belongs to the technical field of pressure-resistant bursting tests. Provided are a pressure-resistant bursting test tool and a pressure-resistant bursting test system. The pressure-resistant bursting test tool is configured to test the bursting pressure of a pressure relief component, the pressure relief component comprising a first wall part which is provided with a pressure relief mechanism. The pressure-resistant bursting test tool comprises a first component and a second component, wherein the first component is provided with an inlet channel, the second component is provided with a discharge channel, the second component and the first component are configured to cooperatively clamp the first wall part, and the discharge channel is configured to discharge a fluid medium flowing through the first wall part from the inlet channel when the pressure relief mechanism is actuated. The pressure-resistant bursting test tool provided with such a structure has a simple structure, and when a bursting test is carried out on the pressure relief component, the first component and the second component can directly act on two sides of the first wall part of the pressure relief component, thereby simplifying the test process, and improving the pressure-resistant bursting test quality of the pressure relief component.

Improved reinforced thermoplastic hoses exhibiting improved layer adhesion, improved burst pressure response, and better fitting retention are provided. High quality adhesion between tube, cover, and reinforcement layers is exhibited. Improved methods of making reinforced thermoplastic hoses to reduce use of SVHC chemicals and improve manufacturing efficiency are also provided. The thermoplastic hoses are suitable for pneumatic and hydraulic applications.

This invention relates to the field of research on the operational characteristics of overpressure relief devices, and particularly to an experimental device for measuring the operational characteristics of overpressure relief devices under water hammer conditions. The device includes: a high-pressure air compressor, a frame, a piston accumulator, a quick-opening device, a high-pressure test assembly, and a high-frequency dynamic pressure sensor. This invention enables the measurement of operational characteristics under different pressure rise rate loads caused by water hammer phenomena on a test bench, providing an experimental platform for the research on the operational characteristics of overpressure relief devices under high pressure rise rates. The overall device is simple, quick, and stable. It effectively solves the problem of applying high pressure rise rate loads in current overpressure relief device operational characteristic measurement tests, overcomes the danger of using combustible gas explosions as pressure sources in existing operational characteristic measurement tests, and overcomes the shortcomings of existing test methods, such as long testing times, the need to calculate gas explosion pressure, and the difficulty in accurately controlling the pressure rise rate.

This invention relates to the field of mine sealing technology and discloses a fixed-point sealing device for underground coal mine boreholes, comprising: a gas extraction pipe, with two grouting and sealing mechanisms symmetrically arranged at both ends of the mine gas extraction hole sealing section on the outer wall of the gas extraction pipe; the grouting and sealing mechanism includes: a grouting bag, the outer wall of which is divided by an isolation layer into an independent sealing grout injection chamber and an external expansion coating bag, the external expansion coating bag being composed of multiple ring arrays of bag units connected end to end; and a coating supply component, which is connected to the feed end of the external expansion coating bag through a pipeline, the outer wall of each bag unit of the external expansion coating bag being provided with a bursting membrane, the bursting pressure threshold of the bursting membrane being matched with the coating spray coverage requirements; the invention adopts the design of the external expansion coating bag and the bursting membrane, which can realize the instantaneous spraying of liquid sealing coating, uniformly covering the inner wall of the extraction hole, forming an initial adhesive layer, and enhancing the adhesion between the sealing material and the hole wall.

The utility model discloses a bursting pressure measuring device of a high-pressure ultra-large flow safety valve, and particularly relates to the technical field of safety of pressure equipment, which comprises a high-pressure cylinder and a control assembly, one end of the high-pressure cylinder is provided with an assembling window used for connecting a digital display pressure gauge and installing the safety valve, and a connecting gear is meshed with a rotating seat. A threaded roller connected with a rotating seat is in threaded connection with a high-pressure cylinder, a propelling seat at the end of the threaded roller slides in the high-pressure cylinder and is sealed by a sealing ring, a digital display pressure gauge is installed and powered on, a control assembly is used for pressurizing, the threaded roller is propelled, the hydraulic oil pressure is uniformly and stably increased, and the digital display pressure gauge displays the pressure in real time until a safety valve explodes and records a peak value. The diameter ratio of the rotating base, the connecting gear and the driving cylinder is designed to be a large transmission ratio of two to one to four, motor overload is avoided, long-term reliable and stable work of the device is guaranteed, the propelling speed and displacement of the threaded roller are accurately controlled through reasonable transmission, pressure is uniformly increased, the pressure increasing process of the safety valve is accurately simulated, and the bursting pressure is accurately measured.

The application discloses a verification method for burst pressure of a type IV high-pressure hydrogen storage cylinder, and comprises the following steps: establishing a hydrogen storage cylinder geometric model; obtaining material performance parameters of each structure of the hydrogen storage cylinder; applying a design internal pressure load to the hydrogen storage cylinder geometric model to perform internal pressure static load simulation analysis, and obtaining variation rules of stress values of key positions with the internal pressure load; establishing a strain failure criterion suitable for the hydrogen storage cylinder, performing progressive damage failure simulation analysis on the hydrogen storage cylinder, and obtaining variation rules of axial and ring direction displacements of the hydrogen storage cylinder with the internal pressure; determining the burst pressure of the hydrogen storage cylinder through the internal pressure static load simulation analysis and the progressive damage failure simulation analysis respectively, taking the minimum value of the burst pressures obtained through the two methods as the burst strength; and comparing the determined burst strength with a design burst pressure to verify rationality of the hydrogen storage cylinder design. The burst strength calculated by the method is more accurate, and the safety of the hydrogen storage cylinder in use can be further ensured.

The application discloses a drilling blowout prevention and gas extraction integrated hole sealing device and method, which comprises a sleeve, a tee joint, a gas extraction pipe and a surge bag. The integrated hole sealing device is installed at a control hole, at which time gas extraction operation can be performed on each control hole, and then hydraulic fracturing operation is continuously performed in a burst pressure hole. After one of the control holes is connected with a crack generated by the burst pressure hole, part of the gas and water-coal mixture will be discharged into the surge bag from the control hole. The surge bag is rapidly expanded from a folded state, thereby playing a buffering role. The control hole can extract gas, discharge water and discharge residue, the danger of a large amount of gas and water-coal mixture being suddenly discharged from the control hole is avoided, and whether each control hole is connected with the burst pressure hole can be known by observing the change of the surge bag. The control hole is temporarily blocked, thereby facilitating the continuous fracturing operation on other control holes, and finally all the control holes can be efficiently and accurately connected during the hydraulic fracturing process of the burst pressure hole.

To overcome the technical problem of existing explosion-proof discs experiencing severe deformation that reduces battery safety, the present application provides an explosion-proof disc and battery. The disc comprises a bursting body having a weak area and multiple reinforcing ribs formed thereon. The reinforcing ribs form a groove on one side of the bursting body and a protrusion on the other side of the bursting body. The reinforcing ribs at least partially enclose a reinforced area, and a portion of the reinforced area contracts toward the center of the reinforced area. The explosion-proof disc provided by the present application improves the structural strength of the disc, reduces deformation, and maintains the stability of the burst pressure threshold.

The utility model provides a multifunctional hollow fiber membrane testing device. The multifunctional hollow fiber membrane testing device comprises a compressed air release assembly, a first three-way pipe, a digital display pressure gauge, a first pressure regulating valve, a second three-way pipe, a first air pipe valve switch, a second air pipe valve switch, a bursting pressure testing assembly and a tangential flow testing assembly, the air inlet end of the compressed air release assembly communicates with one end of the first three-way pipe through an air pipe. The other two ends of the first three-way pipe are respectively connected to one side of a digital display pressure gauge and one side of a first pressure regulating valve through air pipes; the other side of the first pressure regulating valve is communicated to one end of a second three-way pipe through an air pipe; the other two ends of the second three-way pipe are respectively connected to one side of a first air pipe valve switch and one side of a second air pipe valve switch through air pipes; the other side of the first air pipe valve switch is connected with the bursting pressure testing assembly; the other side of the second air pipe valve switch is connected with the tangential flow testing assembly. The problems that the utilization rate and the testing efficiency of the hollow fiber membrane testing device are low are solved.

The utility model relates to the technical field of high-pressure gas-filled cabinets, in particular to an environment-friendly high-pressure gas-filled cabinet, which comprises a plurality of groups of cabinet bodies, the plurality of groups of cabinet bodies are assembled and matched, mounting ports are arranged on the front and the back of the cabinet bodies and used for mounting devices and gas-filled tubes in a sealed manner, exhaust ports are arranged on the cabinet bodies, and the exhaust ports are communicated with the gas-filled tubes. An explosion-proof assembly is installed on the exhaust port and comprises a first pipe body, the first pipe body is installed on the exhaust port, a second pipe body is installed at one end of the first pipe body, a first explosion-proof membrane and a second explosion-proof membrane are installed in the first pipe body and the second pipe body respectively, and the explosion pressure value of the first explosion-proof membrane is smaller than that of the second explosion-proof membrane. The explosion-proof diaphragm I and the explosion-proof diaphragm II with different explosion pressure values are arranged, so that a two-stage pressure relief mechanism is formed, instant and massive leakage of insulating gas is avoided, the gas supply cost and the environmental burden are reduced, the power failure range and the maintenance workload caused by faults are reduced, short-time operation of the high-pressure gas-filled cabinet is maintained, and the power supply continuity is improved.

The utility model provides an explosion valve capable of detecting output signals, which integrates explosion protection and signal feedback functions. The valve is composed of a valve body assembly, a rupture disk and a detection assembly. The rupture disk is made of an AL3003 material, a specific blasting cracking area and blasting pressure are designed, and safe pressure relief during overpressure is guaranteed. The detection assembly monitors the state of the rupture disk in real time through cooperation of the magnetic induction switch and the magnetic body. When the pressure in the container exceeds a set value, the rupture disk is ruptured, the magnetic body moves along with the rupture disk, connection with the magnetic induction switch is disconnected, an alarm signal is sent to a control system in real time, and automatic shutdown protection is achieved. The valve body assembly is reasonable in design and convenient to install and maintain. The explosion valve not only improves the safety of the pressure container, but also realizes the instant feedback of abnormal pressure, is suitable for high-risk industries such as pharmacy and chemical engineering, and has remarkable safety benefits and practical value.

A rectangular rupture disk comprising sheet metal includes an edge region with which the rupture disk is fastenable to an opening of a container or of a conduit. In the edge region, the rupture disk has a fold-over including a first folded over part of the sheet metal and a second part of the sheet metal to which the first folded over part is parallel or predominantly parallel. The rupture disk further includes a central region with which the opening is sealable until the container or conduit reaches a bursting pressure, and predetermined breaking lines along which the rupture disk ruptures to at least partially open the central region in response to the container or conduit reaching the bursting pressure.

The utility model discloses an anti-deformation device for welding an anti-explosion valve of a battery cover plate, and belongs to the field of welding of battery cover plates. Comprising a supporting seat, a base, a pressing plate, a pressing block and a power assembly. By arranging the base and the pressing plate with the pressing block, during welding, the pressing plate drives the pressing block to move downwards, so that the pressing block is matched with the base to firmly press and fix the substrate, controllable downward pressure is applied in real time in the welding process, deformation caused by thermal stress is actively counteracted, and therefore the situation that the substrate deforms in the welding process can be effectively prevented; and correction treatment after deformation is not needed. Therefore, the flatness deviation of the substrate after the explosion-proof valve is welded can be ensured to be less than or equal to 0.1 mm, and the explosion pressure stability (deviation lt; 5%). And the contact area of the substrate, the base and the pressing block is guaranteed, the heat dissipation efficiency can be guaranteed, stress residues caused by cold and hot changes in the welding process are greatly reduced, and deformation in the subsequent use process is avoided.

The utility model discloses a burst pressure gauge calibrating device, including pressure generator, electric control valve, buffer tank, solenoid valve and pressure standard gauge through pipeline connection in proper order still include pressure -relief valve, and solenoden valve is connected with pressure standard gauge, pressure -relief valve through three -way pipeline A, and the first interface of three -way pipeline A connects solenoid valve, and the second interface connects pressure standard gauge and burst pressure gauge, and the third interface connects pressure -relief valve. The utility model burst pressure gauge calibrating device realizes ladder pre -pressing through pressure generator, electric control valve, buffer tank and solenoid valve to reach the effective simulation to actual dynamic working condition, can truly reflect the instrument working condition.

The invention relates to the technical field of new energy, and discloses a shell structure, a battery and a battery pack. A pressure release valve is arranged on the first wall surface of the shell structure, and the bursting pressure of the pressure release valve is a; the pressure release valve comprises a weak part, and the residual thickness ratio of the weak part is b; the ratio of the mass of the Ti element of the shell structure to the total mass of all the elements of the shell structure is c; wherein c is greater than or equal to 60%; and c * b * a is greater than or equal to 1.5 and less than or equal to 24. According to the shell structure provided by the invention, the light weight of the shell structure is realized by comprehensively controlling the relationship among a, b and c, so that the energy density of the battery is improved; and meanwhile, when the battery is in thermal runaway, the pressure release valve can be opened in time, internal heat is effectively discharged, and detonation of the shell is avoided, so that light weight and safety are both considered. When the formula value of c.b.a is lower than the lower limit, light weight of the shell structure is not facilitated, and when the formula value of c.b.a is higher than the upper limit, the opening pressure of the pressure release valve is too large, and heat cannot be discharged in time.