Explosion-proof performance detection system and method for power battery and storage medium

Abstract

The invention discloses a power battery anti-explosion performance detection system and method and a storage medium, an impact loading module in the system is connected with a battery mounting mold, and a metal foil included in the impact loading module generates electric explosion through instantaneous pulse current output by a high-voltage pulse power supply unit to generate impact waves; the shock wave pushes the flyer to realize ultra-high-speed impact on the power battery; and the information acquisition module is used for acquiring the impact information and obtaining a detection result of the explosion-proof performance detection based on the impact information. According to the invention, the ultra-high-speed impact possibly suffered by the power battery in an actual application scene can be simulated, and an extreme and real test environment is provided for the power battery, so that the accuracy of a detection result of explosion-proof performance detection is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power battery safety performance detection, and in particular to a power battery explosion-proof performance detection system and method and a storage medium. BACKGROUND

[0002] Power battery technology is one of the key technologies in the field of new energy vehicles and renewable energy reserves. With the development of current technology, the production scale of power batteries is gradually expanding, and their energy density is also continuously improving, which means that power batteries can store more electrical energy under the same volume or weight, but also means that the danger of accidents induced by power battery failures will be more serious. In order to improve the safety of power batteries, so that they can remain stable in performance under extreme environments such as high-speed impact, collision or explosion, and do not burn, explode or other violent abnormal reactions, in order to achieve the purpose of reducing property loss and casualties, it is of great significance to carry out higher safety performance detection.

[0003] At present, the explosion-proof performance detection of power batteries generally uses impact / puncture devices for battery detection in a lithium battery impact detection system and extrusion detection equipment in a new energy vehicle battery explosion-proof performance detection device. However, the existing battery impact / puncture devices and extrusion detection equipment have limitations in battery explosion-proof performance detection. For example, the impact speed generated in the test is generally low, which is not enough to accurately simulate the super-high-speed impact that power batteries may encounter in actual use under traffic accidents and unmanned aerial vehicle collision scenarios, resulting in significant deviation between the test results and actual application conditions. There are also deficiencies in data acquisition, processing and test repeatability. The existing equipment is difficult to obtain key information such as impact speed and impact pressure, thereby affecting the accuracy and reliability of the evaluation of power battery explosion-proof performance.

[0004] Therefore, how to simulate the super-high-speed impact that power batteries may encounter in actual application scenarios, so as to accurately evaluate the explosion-proof performance of power batteries under super-high-speed impact is a problem to be solved. SUMMARY

[0005] In order to solve the above technical problems, the embodiments of the present application provide a power battery explosion-proof performance detection system and method, a computer readable storage medium and a computer program product.

[0006] In a first aspect, in order to solve the above technical problems, the present application provides a power battery explosion-proof performance detection system, which comprises an impact loading module, the impact loading module comprising a high-voltage pulse power supply unit, a metal foil and a flyer; The metal foil material generates an electric explosion to produce a shock wave by the transient pulse current output by the high-voltage pulse power unit, and the shock wave pushes the flyer to achieve a super-high-speed impact on the power battery to be tested to detect the explosion-proof performance of the power battery.

[0007] The beneficial effects are: In the technical scheme provided by the embodiment of the application, the metal foil material in the impact loading module generates an electric explosion to produce a shock wave by the transient pulse current output by the high-voltage pulse power unit, and the shock wave pushes the flyer to achieve a super-high-speed impact on the power battery, so that the super-high-speed impact that the power battery may suffer in an actual application scenario can be simulated, and an extreme and real test environment is provided for the power battery. After the super-high-speed impact on the power battery, rapid data acquisition can be achieved, so as to improve the efficiency of the test process, and then the explosion-proof performance of the power battery is evaluated, and important data support is provided for battery design and material improvement.

[0008] In a second aspect, the application provides a power battery explosion-proof performance detection method, comprising: Controlling the power battery to be tested to be in a test state; Outputting a transient pulse current to the metal foil material to make the metal foil material generate an electric explosion to produce a shock wave, and the shock wave pushes the flyer to achieve a super-high-speed impact on the power battery; Obtaining impact information of the super-high-speed impact, and obtaining a detection result of the explosion-proof performance detection of the power battery based on the impact information.

[0009] In a third aspect, the application further provides a computer-readable storage medium having computer-readable instructions stored thereon, when the computer-readable instructions are executed by a processor of a computer, the computer executes the power battery explosion-proof performance detection method as described above.

[0010] In a fourth aspect, the application further provides a computer program product or a computer program, the computer program product or the computer program comprising computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions to enable the computer device to execute the power battery explosion-proof performance detection method provided in the various optional embodiments described above.

[0011] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0012] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, further serve to explain the principles of the application. It is to be understood that the drawings are only schematic, and that they do not necessarily correspond to the actual relative sizes of the components. It is also to be understood that the embodiments shown in the drawings are merely meant as illustrative examples of the application, and that, as such, other embodiments of the application can be obtained from these drawings by a person of ordinary skill in the art without paying creative labor. In the drawings: Figure 1 is a block diagram of a power battery explosion-proof performance detection system according to an example embodiment of the application; Figure 2 is a block diagram of a power battery explosion-proof performance detection system according to an example embodiment of the application; Figure 3 is a schematic diagram of a power battery explosion-proof performance detection system according to an example embodiment of the application; Figure 4 is a schematic diagram of a metal foil according to an example embodiment of the application; Figure 5 is a schematic diagram of a power battery being impacted by a flyer at a high speed through an acceleration chamber according to an example embodiment of the application; Figure 6 is a flowchart of a power battery explosion-proof performance detection method according to an example embodiment of the application; Figure 7 is a schematic diagram of data connections between modules of a power battery explosion-proof performance detection system applying a power battery explosion-proof performance detection method according to an example embodiment of the application; Figure 8 is a schematic diagram of a computer system of an electronic device suitable for implementing embodiments of the application. DETAILED DESCRIPTION

[0013] The example embodiments will be described in detail herein with reference to the attached drawings. The description of the example embodiments is only meant to represent some embodiments consistent with the application. Rather, they are only examples of apparatuses and methods consistent with some aspects of the application as detailed in the appended claims.

[0014] The block diagrams shown in the drawings are only functional entities, and do not necessarily have to correspond to physically independent entities. That is, the functional entities can be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0015] The flowcharts shown in the drawings are only illustrative, and do not necessarily include all contents and operations / steps, nor are they necessarily executed in the order described. For example, some operations / steps can be further decomposed, and some operations / steps can be combined or partially combined, so the actual execution order can be changed according to actual conditions.

[0016] "Multiple" mentioned in the present application refers to two or more. "And / or" describes the association relationship of associated objects, which means that there can be three relationships, for example, A and / or B can represent three cases: A exists alone, A and B exist together, and B exists alone. The character " / " generally represents that the associated objects before and after it are in an "or" relationship.

[0017] In order to solve the problem that the impact speed generated in the existing explosion-proof performance test is generally low, which is not enough to accurately simulate the super-high speed impact generated in the traffic accident and unmanned aerial vehicle collision scenarios that the power battery may suffer in actual use, thereby causing a significant deviation between the test results and the actual application conditions, affecting the accuracy and reliability of the evaluation of the explosion-proof performance of the power battery, the embodiments of the present application propose a power battery explosion-proof performance detection system and method, computer readable storage medium, which are mainly related to the power battery explosion-proof performance detection technology included in the power battery safety performance detection technology. The embodiments will be described in detail below.

[0018] First, please refer to Figure 1 , Figure 1 is a block diagram of a power battery explosion-proof performance detection system according to an exemplary embodiment of the present application. As Figure 1 indicated, in an exemplary embodiment, the power battery explosion-proof performance detection system 100 includes an impact loading module 110, which includes a high-voltage pulse power supply unit 111, a metal foil 112, and a flyer 113. The metal foil 112 generates an electric explosion to produce a shock wave by the transient pulse current output by the high-voltage pulse power supply unit 111, and the shock wave pushes the flyer 113 to achieve a super-high speed impact on the power battery, so as to detect the explosion-proof performance of the power battery.

[0019] As can be seen from the above, in the method provided in the present embodiment, the high-voltage pulse power supply unit of the impact loading module outputs a transient pulse current to make the metal foil generate an electric explosion to produce a shock wave to push the flyer, so as to achieve a super-high speed impact on the power battery. This can simulate the super-high speed impact that the power battery may suffer in the actual application scenario, provide an extreme and real test environment for the power battery, perform accurate explosion-proof performance detection, and then evaluate the explosion-proof performance of the power battery, thereby providing crucial data support for battery design and material improvement.

[0020] In an example embodiment of the present application, the detection result of the explosion-proof performance detection is obtained by the information acquisition module. Please refer to Figure 2 , Figure 2 In an example embodiment of the present application, the block diagram of the power battery explosion-proof performance detection system is shown in FIG. 1. As shown in FIG. 1, the power battery explosion-proof performance detection system 100 includes an impact loading module 110 and an information acquisition module 130. The impact loading module 110 is connected with the power battery, and is used to generate an ultra-high-speed impact on the power battery. The information acquisition module 130 is connected with the impact loading module 110 and the power battery, and is used to obtain impact information, and obtain the impact speed of the ultra-high-speed impact and the impact pressure of the power battery under the action of the ultra-high-speed impact based on the impact information. Figure 2 The information acquisition module 130 is also connected with the charge-discharge test module 120, and is used to obtain the battery performance parameters transmitted by the charge-discharge test module 120, and obtain the detection result of the explosion-proof performance detection based on the impact speed, the impact pressure and the battery performance parameters.

[0021] When the power battery explosion-proof performance detection system is used, the high-voltage pulse power supply unit 111 in the impact loading module 110 connected with the power battery outputs a transient pulse current, and the metal foil 112 generates an electric explosion by using the Joule heat effect, so as to generate an impact wave to push the flyer 113 to realize the ultra-high-speed impact on the power battery. In addition, in the example embodiments provided by the present application, the flyer 113 plays a role of energy transmission in the impact loading module 110, and is prepared by an insulating film with a thickness of tens of microns, and is attached to the surface of the metal foil. The insulating film is generally prepared by polyimide, polyester film and other materials. When the flyer 113 realizes the ultra-high-speed impact on the power battery at a certain speed under the action of the impact wave, the extreme environment that may occur in the actual application scenario of the power battery is simulated.

[0022] In the process of the impact loading module 110 generating the ultra-high-speed impact, the information acquisition module 130 obtains the impact information in real time. The impact information is each related data in the process of generating the ultra-high-speed impact and acting on the power battery. The information acquisition module 130 also receives the battery performance parameters transmitted by the charge-discharge test module 120. The battery performance parameters include current, voltage, internal resistance and the like. Then, the information acquisition module 130 obtains the detection result of the explosion-proof performance detection based on the impact speed, the impact pressure and the battery performance parameters, so as to evaluate the explosion-proof performance of the power battery based on the result.

[0023] ​The charge / discharge test module 120 connects to the positive and negative terminals of the power battery and can be used to test the battery performance parameters under different impact velocities and charge / discharge methods. Before conducting the explosion-proof performance test, the charge / discharge machine performs charge / discharge tests on the power battery to achieve a stable test state, and records the initial performance of the battery based on the charge / discharge test results and the basic parameter information of the power battery. During the explosion-proof performance test, the power battery is charged and discharged at the impact velocity corresponding to the ultra-high-speed impact caused by the instantaneous pulse current, and a set of battery performance parameter tests is obtained, where each impact velocity and impact pressure corresponds to a set of battery performance parameters. The charge / discharge methods of the charge / discharge machine in the test module include: 1) Charging methods: constant current, pulse, constant voltage current limiting, constant current voltage limiting, variable current charging, constant power, constant resistance; 2) Discharging methods: constant current, pulse, variable current discharging, constant power, constant resistance; 3) Cyclic methods: arbitrary combination of charging, discharging, and resting stages.

[0024] Therefore, the present application, through the above embodiments, provides an extreme and realistic testing environment by subjecting the power battery to an ultra-high-speed impact. The information acquisition module collects impact information and battery performance parameters, clearly defining the real-time changes of various data, enabling rapid data acquisition and improving the efficiency of the testing process. This makes it suitable for conducting numerous experiments and allows for multiple tests in a short period. Furthermore, the power battery explosion-proof performance testing provided by this application utilizes a closed testing environment, which is relatively safer to operate compared to other ultra-high-speed impact loading devices. In addition, the information acquisition module comprehensively analyzes the acquired impact pressure, impact velocity, and battery performance parameters, clarifying the specific impact of impact velocity and impact pressure on battery performance parameters, obtaining the explosion-proof performance test results. Based on these results, the explosion-proof performance of the power battery can be evaluated, providing crucial data support for battery design and material improvement, thereby effectively enhancing subsequent research on power battery fault prevention capabilities and countermeasures.

[0025] Optionally, in an exemplary embodiment of this application, the power battery explosion-proof performance testing system further includes a battery mounting mold, in which the power battery is fixed, and an impact loading module is connected to the battery mounting mold; the high-voltage pulse power supply unit includes a control circuit, a charging circuit, and a discharging circuit; The control circuit is used to control the power supply, ground wire, and the generation and switching of corresponding input signals of the high-voltage pulse power supply unit; The charging circuit is used to quickly charge the high-voltage energy storage capacitor; The discharge circuit is used to detonate the metal foil by outputting an instantaneous pulse current after the high-voltage energy storage capacitor reaches the discharge standard and the high-voltage switch is turned on.

[0026] Please see Figure 3 , Figure 3This is a schematic diagram of a power battery explosion-proof performance testing system in an exemplary embodiment of this application. Figure 3 As shown, the control circuit is mainly responsible for the generation and switching of the power supply, ground wire, and corresponding input signals of the high-voltage pulse power supply unit; the charging circuit is mainly responsible for boosting the low-voltage power supply through the transformer and rapidly charging the high-voltage energy storage capacitor; the discharging circuit is mainly responsible for outputting an instantaneous pulse current to detonate the metal foil after the high-voltage energy storage capacitor reaches the discharge standard and the high-voltage switch is turned on. The discharge standard is determined by the test requirements, and the energy of the ultra-high-speed impact is controlled by controlling the stored capacity of the high-voltage energy storage capacitor.

[0027] The high-voltage pulse power supply unit has no strict requirements for the charging circuit, but the discharge circuit needs to release as much electrical energy as possible stored in the high-voltage energy storage capacitor into the metal foil as quickly as possible, and it needs to ensure that the released electrical energy is sufficient to vaporize the metal foil. Therefore, the capacitor in the discharge circuit needs to be increased as much as possible, and the resistance and inductance need to be reduced as much as possible.

[0028] As can be seen from the above, in the method provided in this embodiment, the high-voltage pulse power supply unit of the impact loading module outputs an instantaneous pulse current to cause the metal foil to explode electrically, generating a shock wave that propels the flying plate, thereby achieving an ultra-high-speed impact on the power battery. Compared with traditional ultra-high-speed impact methods, this method has a higher safety factor, higher energy utilization rate, lower cost, simpler operation, no pollutants, is environmentally friendly, and has good repeatability. Furthermore, the impact loading method can be controlled by controlling the instantaneous pulse current, allowing the impact speed range to be adjusted as needed, which helps to verify the accuracy of experimental results, and the requirements for power supply system and circuit parameters are not high.

[0029] Optionally, in an exemplary embodiment of this application, the metal foil includes electrodes at both ends and a bridge region disposed between the electrodes; after being energized, heat is deposited in the bridge region, causing a phase change in the bridge region, and an explosion occurs after the bridge region breaks to form an open circuit, generating a shock wave.

[0030] Please see Figure 4 , Figure 4 This is a schematic diagram of a metal foil material in an exemplary embodiment of this application. (As shown...) Figure 4 As shown, the metal foil includes electrodes at both ends and a bridge region between the electrodes, with the electrodes and the bridge region integrally formed. The bridge region undergoes a phase change due to the heat energy generated and continuously deposited by a transient pulse current. When the heat energy reaches a certain level, the bridge region fractures, forming an open circuit and causing an electrical explosion that generates a shock wave. Preferably, the metal foil has a thickness of 10... -1 The component is prepared by cutting and slicing millimeter-level metal foil. It is an independent and complete part with an overall hourglass shape. The narrow middle area connecting the two ends is the bridge area, which can realize the conversion of electrical energy into kinetic energy through an electric explosion.

[0031] Specifically, in Figure 3 In the power battery explosion-proof performance detection system shown, the metal foil is connected in series as a load in the discharge circuit. When the high-voltage switch is turned on, the instantaneous pulse generated by the high-voltage energy storage capacitor is transmitted to the metal foil. With the continuous injection of current, the electric energy is continuously deposited on the metal foil in the form of heat energy due to the Joule heating effect. When the metal foil deposits enough energy, the bridge region of the metal foil changes from solid to liquid due to the change in temperature, and the liquid metal vaporizes rapidly. After the bridge region of the metal foil is completely vaporized, the metal foil is almost not conductive, the resistance is extremely large, the voltage across the metal foil increases sharply, the volume of metal vapor expands rapidly, and an electric explosion occurs, generating a large amount of high-temperature and high-pressure metal gas and plasma, which continuously expands outward and pushes shock waves to the surrounding air.

[0032] In addition, it should be noted that the material, geometric shape, size and other parameters of the metal foil will affect the initial resistance of the metal foil, thereby affecting the explosion time, energy deposition and energy utilization rate of the electric explosion and other performances. Therefore, the embodiments provided in the present application select a conductor with a relatively large initial resistivity and a relatively low sublimation heat as the material of the metal foil, such as Cu, Al, Ag and Au. The shape design of the metal foil can change the expansion direction of the plasma, which is beneficial to improve the flatness of the flyer during flight. Therefore, the embodiments provided in the present application adopt a ring shape, a square shape, a square wave shape and the like. Among them, the ring-shaped foil can more evenly drive the flyer, which is beneficial to generate greater pressure; the square foil generates impact more evenly than the rectangular foil; and the square wave-shaped foil can greatly improve the energy utilization rate of the shock loading module. The change of the geometric size parameters of the metal foil will affect the current density at the electric explosion moment of the metal foil, thereby affecting the ability of the shock wave to push the flyer. When the input energy value and the foil size are constant, there is an optimal foil thickness value that can maximize the energy utilization rate of the shock loading module. Therefore, under the condition that the foil thickness is constant, the embodiments provided in the present application reduce the size of the bridge region of the foil to improve the driving ability of the flyer.

[0033] As can be seen from the above, in the method provided in the present embodiment, the flyer is pushed by the shock wave generated by the electric explosion of the metal foil, so that the super-high-speed impact on the power battery is realized. The strain rate can be as high as 10 6 to 10 8 s -1 or more, so that the extreme environment in the actual application scenario of the power battery is simulated, and the mechanical conditions similar to the super-high-speed impact that the battery may suffer in an actual accident are generated. Compared with the traditional super-high-speed impact method, the method has higher safety factor, lower cost and more convenient operation, and does not produce pollutants. In addition, by adjusting the shape parameters and material parameters of the metal foil, the energy utilization rate can be improved, and the green environmental protection is further realized.

[0034] Optionally, in an exemplary embodiment of this application, the battery mounting mold includes conductive electrodes, a clamping plate, a mold base, an insulating plate, an insulating and impact-resistant plate, an acceleration chamber, a pressure block, and an upper clamp. The upper clamp is connected to the mold base by bolts. The pressure block is set below the upper clamp and is used to fix the conductive electrode, the pressure plate, the insulating plate, the insulating impact plate and the acceleration chamber between the upper clamp and the mold base. An insulating plate is placed between the mold base and the conductive electrode for insulation and to buffer the downward impact generated during the electrical explosion. The conductive electrode consists of two symmetrically arranged copper plates. One end of the conductive electrode is connected to the discharge circuit, and the other end is connected to the metal foil, so that the metal foil is connected in series as a load in the discharge circuit. The clamping plate includes two copper plates used to fix the metal foil to the conductive electrode by bolt connection; The insulating impact-resistant plate is in contact with the metal foil, and the other end of the metal foil is in contact with the flyer. The acceleration chamber is located above the flyer blades and is used to shear the flyer blades and provide an acceleration channel for the sheared flyer blades so that the sheared flyer blades can impact the power battery at ultra-high speed.

[0035] like Figure 3 As shown in the provided power battery explosion-proof performance testing system, in this embodiment, the conductive electrode in the battery mounting mold is preferably a copper busbar electrode, composed of two symmetrically arranged copper plates. Its function is to connect the metal foil as a load in series in the discharge circuit, so that the high-voltage pulse power supply unit forms a closed circuit with the metal foil through the conductive electrode in the battery mounting mold. The clamping plate is composed of two copper plates, and its function is to fix the metal foil to the conductive electrode by bolt connection to form a stable electrical contact to ensure the smooth progress of the discharge process. Both the conductive electrode and the clamping plate are made of T2 copper, which has good hardness and conductivity, and can ensure the stability and efficiency of the high-voltage pulse power supply unit. The metal foil is placed on the insulating impact-resistant plate, with insulating impact-resistant plates extending from both ends. The lower sides of both ends contact the two conductive electrodes respectively. The two clamping plates cooperate with the two conductive electrodes to clamp and position the two ends of the metal foil to ensure the alignment between the bridge area and the flyer plate.

[0036] The mold base provides fixation and positioning for the battery mounting mold. The upper clamp is bolted to the mold base to secure the various components within the battery mounting mold. The pressure block, made of insulated metal, is positioned below the upper clamp and ensures it does not deform under impact. Its function is to initially clamp the battery mounting mold during installation, preventing other components from shifting when the upper clamp is fully clamped.

[0037] An insulating plate is arranged between the die base and the conductive electrode, preferably an insulating ceramic plate, which functions to insulate the conductive electrode from the die base and to buffer the downward impact generated during the electric explosion of the metal foil, thereby protecting the test platform and prolonging the service life of the test device.

[0038] The insulating impact-resistant plate is in direct contact with the metal foil, which functions to absorb the downward impact generated during the electric explosion of the metal foil and to provide electrical insulation for the metal foil, thereby ensuring that the discharge circuit is only conducted through the metal foil when the high-voltage energy storage capacitor releases electric energy. In addition, a large amount of metal vapor is generated during the electric explosion of the metal foil, which will form metal particles on the surface of the insulating impact-resistant plate in direct contact with the metal foil after cooling, thereby interfering with subsequent tests. Therefore, the insulating impact-resistant plate needs to be cleaned or replaced after a certain number of tests.

[0039] The acceleration bore is arranged above the flyer, which is used for shearing the flyer and providing an acceleration channel for the sheared flyer, so that the sheared flyer impacts the power battery at a high speed. As shown in Figure 5 , the acceleration bore is used for shearing the flyer. Figure 5 In an example embodiment of the present application, the flyer is accelerated to impact the power battery at a high speed through the acceleration bore. Figure 5 The acceleration bore needs to ensure that the edge is perpendicular and the inner diameter is circular in order to completely shear the flyer. In addition, the length of the acceleration bore has a great influence on the speed of the flyer, and the length of the acceleration bore should be appropriate.

[0040] Optionally, in an example embodiment of the present application, the information acquisition module includes a Rogowski coil current probe, a high-voltage probe, a pressure detection unit, a waveform storage, a digital oscilloscope, and a data processing unit. The Rogowski coil current probe and the high-voltage probe are arranged in the discharge circuit. The Rogowski coil probe is used to detect the current output signal in the impact process included in the impact information, and the high-voltage probe is directly connected to the electrodes at both ends of the metal foil, which is used to detect the voltage output signal in the impact process included in the impact information, which is recorded and displayed by the digital oscilloscope. The pressure detection unit is used to detect the impact pressure electrical signal included in the impact information, which is recorded and displayed by the digital oscilloscope. The data processing unit is connected to the digital oscilloscope, which is used to receive the battery performance parameters, the current output signal, the voltage output signal, and the impact pressure electrical signal transmitted by the digital oscilloscope, and to obtain the impact speed and the impact pressure based on the current output signal, the voltage output signal, and the impact pressure electrical signal. The data processing unit is also used to obtain the detection result of the explosion-proof performance detection based on the impact speed, the impact pressure, and the battery performance parameters.

[0041] As shown in Figure 3The power battery explosion-proof performance detection system provided in the embodiment, in the embodiment, the Rogowski coil current probe and the high-voltage probe are arranged in the discharge circuit, the Rogowski coil probe can induce a small current through the coil, thereby indirectly measuring the pulse current, according to the current conversion relationship, the explosion current of the metal foil at the moment of electric explosion can be obtained as the current output signal; the high-voltage probe is directly connected with the two electrodes of the metal foil at two ends, and is used for detecting the voltage waveform at two ends of the metal foil as the voltage output signal, and the current output signal and the voltage output signal are recorded and displayed by the digital oscilloscope.

[0042] The way in which the data processing unit calculates the impact speed based on the current output signal, the voltage output signal and related data is as follows: Under ideal test environment, the part of energy of the metal foil converted into system kinetic energy is generated at the moment of electric explosion (i.e. electric Gurney energy), and the spatial distribution of the metal gas pressure, density and internal energy formed by explosion is uniform, the metal gas particle speed is linearly distributed, the speed is zero near the insulating impact-resistant plate and the speed is maximum near the flyer, and the energy conservation can be given as follows: In the formula, m g , m f are the mass of the metal vapor and the flyer per unit area respectively; v(r, t), v f are the particle speed of the metal vapor and the flyer speed respectively; r f (t) is the position of the interface between the metal vapor and the flyer; E(t), E e，g are the specific internal energy of the metal vapor and the electric Gurney energy respectively, and p is the density of the metal vapor; the first term on the left side of the above equation is the internal energy of the metal vapor; the second term is the kinetic energy of the metal vapor; the third term is the kinetic energy of the flyer; and the right side of the equation is the electric Gurney energy absorbed by the metal foil.

[0043] In the formula, E d is the total electric energy absorbed by the unit mass of the metal foil from the discharge circuit; η, τ are proportional coefficients; J b is the current density of the metal foil at the moment of electric explosion, i.e. the current output signal, which is obtained by dividing the current function I(t) measured by the Rogowski coil current probe by the cross-sectional area of the bridge area of the metal foil; p b is the resistivity of the metal vapor at the moment of electric explosion, and p F is the initial density of the metal foil. According to the assumption that the metal vapor particle speed is linearly distributed, combined with the state equation of ideal gas and Newton's second law, and since the movement distance of the flyer is much greater than the initial thickness of the metal foil, the simplified formula of the flyer speed can be derived as follows: wherein R = m f / m g is the ratio of the mass of the flyer per unit area to the mass of the metal foil.

[0044] From the above, in the method provided in the embodiment, the impact information and the battery performance parameters are collected by the information collection module, the real-time changes of various data are determined, the data collection is realized quickly, the efficiency of the test process is improved, a large number of experiments can be carried out, and multiple tests can be carried out in a short time.

[0045] Optionally, in an example embodiment of the application, the pressure detection unit comprises a patch type pressure sensor and a signal conditioning circuit, and the signal conditioning circuit is connected to the patch type pressure sensor and the digital oscilloscope. The patch type pressure sensor is arranged between the power battery and the battery mounting mold, and is used to obtain the perceived pressure in the impact process and convert it into an impact pressure electrical signal, which is transmitted to the signal conditioning circuit.

[0046] As Figure 3 As shown in the power battery explosion-proof performance detection system provided, in the embodiment, the patch type pressure sensor is arranged between the power battery and the battery mounting mold. Specifically, the pressing block is arranged between the power battery and the upper clamp, and the patch type pressure sensor is arranged between the pressing block and the upper clamp. The patch type pressure sensor is used to directly perceive the impact pressure and convert the applied impact pressure into an electrical signal. The signal conditioning circuit is responsible for amplifying, filtering, linearizing, etc. the original electrical signal generated by the patch type pressure sensor, and transmitting it to the waveform storage through the signal line. Finally, the data processing unit processes and analyzes it.

[0047] The patch type pressure sensor directly perceives and converts the pressure applied by the ultra-high speed impact into an electrical signal. The relationship between the output voltage (ΔV) of the patch type pressure sensor and the applied pressure (P) can be represented by the following formula: In the formula, ΔV is the voltage change amount output by the signal conditioning circuit, and G is the sensitivity of the patch type pressure sensor.

[0048] From the above, in the method provided in the embodiment, since the battery may be broken during the power battery explosion-proof performance test, resulting in distortion of the impact pressure data, the patch type pressure sensor is arranged between the pressing block and the upper clamp to accurately obtain the impact pressure borne by the power battery under the action of the ultra-high speed impact.

[0049] Figure 6 is a flowchart of a power battery explosion-proof performance detection method according to an example embodiment of the application. As Figure 6As shown, the method is applied to the power battery explosion-proof performance detection system provided in the application, and can include steps S601 to S603, as follows: Step S601, the power battery is controlled to be in a test state.

[0050] Step S602, outputting the instantaneous pulse current to the metal foil to cause the metal foil to undergo electric explosion to generate a shock wave, and the shock wave pushes the flyer to impact the power battery at a high speed.

[0051] Step S603, obtaining impact information of the high-speed impact, and obtaining a detection result of the explosion-proof performance detection of the power battery based on the impact information.

[0052] In another exemplary embodiment, step S603 specifically includes: obtaining impact information of the high-speed impact, obtaining an impact speed of the high-speed impact and an impact pressure borne by the power battery under the action of the high-speed impact based on the impact information; obtaining a battery performance parameter of the power battery, and obtaining a detection result of the explosion-proof performance detection of the power battery based on the impact speed, the impact pressure, and the battery performance parameter.

[0053] The method is applied to the power battery explosion-proof performance detection system provided in the application, and the high-voltage pulse power supply unit of the impact loading module outputs the instantaneous pulse current to cause the metal foil to undergo electric explosion to generate a shock wave to push the flyer, thereby achieving high-speed impact on the power battery. This can simulate the high-speed impact that the power battery may suffer in an actual application scenario, and provide an extreme and real test environment for the power battery. In addition, after the high-speed impact is applied to the power battery, the impact information and the battery performance parameter are collected by the information collection module, the real-time changes of various data are determined, rapid data collection is achieved, the impact pressure, the impact speed, and the battery performance parameter are comprehensively analyzed, the specific influence of the impact speed and the impact pressure on the battery performance parameter is determined, and a detection result of the explosion-proof performance detection is obtained. Based on this result, the explosion-proof performance of the power battery is evaluated, which can provide important data support for battery design and material improvement.

[0054] Please refer to Figure 7 , Figure 7 In an exemplary embodiment of the application, the data connection between the modules when the power battery explosion-proof performance detection system applies the power battery explosion-proof performance detection method is shown in FIG. 5. As shown in FIG. 5, Figure 7As shown, the charge-discharge test module includes a charge-discharge machine to perform charge-discharge test on the power battery in an initial environment to achieve a stable test state, and record the initial performance of the power battery based on the charge-discharge test result and the basic parameter information of the power battery. Then, the low-voltage signal is input through the control circuit, and the low-voltage power supply charges the high-voltage energy storage capacitor through the transformer of the charging circuit. After the high-voltage energy storage capacitor reaches the discharge standard, the high-voltage switch is triggered through the control circuit, and the high-voltage switch outputs a transient pulse large current to the metal foil after being turned on, so that the metal foil bridge area explodes, and an air shock wave is pushed out. The flyer is driven by the shock wave to shear through the acceleration bore, and then impacts the power battery at a certain speed to simulate the extreme environment that the power battery may encounter in actual application scenarios.

[0055] During the impact test, the charge-discharge test module simultaneously performs charge-discharge cycle on the power battery, and records the change curves of the battery performance parameters such as current, voltage, and internal resistance of the battery during the impact process. The patch type pressure sensor of the pressure detection unit in the information acquisition module converts the pressure perceived during the impact process into an electric signal, and after the original electric signal is processed through the signal conditioning circuit, the processed signal is transmitted to the waveform storage through the signal line, and finally the impact speed is obtained by processing and analyzing the signal by the data processing unit.

[0056] The current and voltage output signals of the discharge circuit of the impact loading module high-voltage pulse power unit during the impact process are detected by the Rogowski coil current probe and the high-voltage probe in the information acquisition module, and the current and voltage output signals are recorded and displayed by the digital oscilloscope, and are transmitted to the data processing unit for calculation and analysis to obtain the impact pressure.

[0057] The data processing unit comprehensively analyzes the collected impact pressure, impact speed, and battery performance parameters, determines the specific influence of the flyer impact speed and impact pressure on the battery performance parameters, and evaluates the explosion-proof performance of the power battery based on the analysis result.

[0058] Embodiments of the present application also provide an electronic device, comprising: one or more processors; a storage device for storing one or more programs, when the one or more programs are executed by the one or more processors, the electronic device implements the power battery explosion-proof performance detection method provided in each of the above embodiments.

[0059] Figure 8 The structure of the computer system of the electronic device suitable for implementing the embodiments of the present application is shown. It should be noted that, Figure 8 The computer system 700 of the electronic device shown is only an example, and should not limit the functions and use range of the embodiments of the present application.

[0060] AsFigure 8 As shown, the computer system 800 includes a central processing unit (CPU) 801 which can perform various suitable actions and processes in accordance with programs stored in a read-only memory (ROM) 802 or loaded from a storage section 808 into a random access memory (RAM) 803, such as performing the methods in the above-described embodiments. Various programs and data required for system operation are also stored in the RAM 803. The CPU 801, the ROM 802, and the RAM 803 are connected to each other through a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0061] Connected to the I / O interface 805 are an input section 806 including a keyboard, a mouse, etc.; an output section 807 including a display such as a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 808 including a hard disk, etc.; and a communication section 809 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication section 809 performs communication processing via a network such as the Internet. A drive 810 is also connected to the I / O interface 805 as necessary. A removable recording medium 811 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc. is attached to the drive 810 as necessary, so that a computer program read therefrom is installed into the storage section 808 as necessary.

[0062] In particular, in accordance with embodiments of the present application, the processes described above with reference to the flowcharts can be implemented as a computer software program. For example, embodiments of the present application include a computer program product comprising a computer program carried on a computer readable medium, the computer program comprising computer programs for performing the methods illustrated by the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via the communication section 809, and / or installed from the removable recording medium 811. When the computer program is executed by the central processing unit (CPU) 801, various functions defined in the system of the present application are performed.

[0063] It should be noted that the computer-readable medium in the embodiments of the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination thereof. The computer-readable storage medium may, for example, be an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination thereof. More specific examples of the computer-readable storage medium can include, but are not limited to, an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable compact disc read-only memory (Compact Disc Read-Only Memory, CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this application, the computer-readable signal medium can include a data signal propagated in a baseband or as a carrier wave in a propagated data signal, in which the computer-readable computer program is carried. Such a propagated data signal can take on various forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium other than the computer-readable storage medium, which can send, propagate, or transmit the program for use by or in connection with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium can be transmitted by any suitable medium, including but not limited to wireless, wired, or the like, or any suitable combination thereof.

[0064] The flowcharts and block diagrams in the drawings illustrate the possible implementation architectures, functions, and operations of the systems, methods, and computer program products according to various embodiments of the present application. In the flowcharts or block diagrams, each block can represent a module, a program segment, or a part of code, which contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur in different orders than those noted in the drawings. For example, two blocks represented in succession can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagram or flowchart, and the combination of blocks in the block diagram or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or operations, or can be implemented by a combination of special-purpose hardware and computer instructions.

[0065] Another aspect of the present application also provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the power battery explosion prevention performance detection method as above. The computer readable storage medium can be included in the electronic device described in the above embodiments, or can exist separately without being assembled into the electronic device.

[0066] Another aspect of the present application also provides a computer program product or a computer program, which includes computer instructions stored in a computer readable storage medium. A processor of a computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions to make the computer device execute the power battery explosion prevention performance detection method provided in each of the above embodiments.

[0067] The above merely describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A power battery explosion-proof performance testing system, characterized in that, The system includes an impact loading module, which includes a high-voltage pulse power supply unit, metal foil, and flying sheet. The metal foil undergoes an electrical explosion through the instantaneous pulse current output by the high-voltage pulse power supply unit, generating a shock wave. The shock wave propels the flyer plate to achieve an ultra-high-speed impact on the power battery under test, thereby testing the explosion-proof performance of the power battery.

2. The system according to claim 1, characterized in that, The power battery explosion-proof performance testing system also includes a charge / discharge test module and an information acquisition module. The information acquisition module is connected to the impact loading module and the power battery, and is used to acquire impact information, and based on the impact information, to obtain the impact velocity of the ultra-high speed impact and the impact pressure borne by the power battery under the action of the ultra-high speed impact. The information acquisition module is also connected to the charge-discharge test module to acquire the battery performance parameters transmitted by the charge-discharge test module, and to obtain the test results of the explosion-proof performance test based on the impact speed, the impact pressure and the battery performance parameters.

3. The system according to claim 2, characterized in that, The power battery explosion-proof performance testing system also includes a battery mounting mold, in which the power battery is fixed, and the impact loading module is connected to the battery mounting mold; the high-voltage pulse power supply unit includes a control circuit, a charging circuit, and a discharging circuit; The control circuit is used to control the power supply, ground wire, and the generation and switching of corresponding input signals of the high-voltage pulse power supply unit. The charging circuit is used to quickly charge the high-voltage energy storage capacitor. The discharge circuit is used to detonate the metal foil by outputting an instantaneous pulse current after the high-voltage energy storage capacitor reaches the discharge standard and the high-voltage switch is turned on.

4. The system according to claim 1, characterized in that, The metal foil includes electrodes at both ends and a bridge region between the electrodes; when energized, heat is deposited in the bridge region, causing a phase change in the bridge region, and an explosion occurs after the bridge region breaks to form an open circuit, generating the shock wave.

5. The system according to claim 3, characterized in that, The battery mounting mold includes conductive electrodes, a clamping plate, a mold base, an insulating plate, an insulating and impact-resistant plate, an acceleration chamber, a pressure block, and an upper clamp. The upper clamp is connected to the mold base, and the pressure block is disposed below the upper clamp to fix the conductive electrode, the pressure plate, the insulating plate, the insulating impact-resistant plate and the acceleration chamber between the upper clamp and the mold base; The insulating plate is disposed between the mold base and the conductive electrode for insulation and to buffer the downward impact generated during the electrical explosion. The conductive electrode includes two symmetrically arranged copper plates. One end of the conductive electrode is connected to the discharge circuit, and the other end is connected to the metal foil, so that the metal foil is connected in series as a load in the discharge circuit of the high voltage pulse power supply unit. The clamping plate includes two copper plates, which are used to fix the metal foil to the conductive electrode by bolt connection; The insulating impact-resistant plate is in contact with the metal foil, and the other end of the metal foil is in contact with the flyer plate; The acceleration chamber is located above the flying blade and is used to shear the flying blade and provide an acceleration channel for the sheared flying blade, so that the sheared flying blade can subject the power battery to ultra-high-speed impact.

6. The system according to claim 5, characterized in that, The high-voltage pulse power supply unit forms a closed circuit with the metal foil through the conductive electrode in the battery mounting mold.

7. The system according to claim 2, characterized in that, The information acquisition module includes a Rogowski coil current probe, a high-voltage probe, a pressure detection unit, a waveform memory, a digital oscilloscope, and a data processing unit. The Rogowski coil current probe and the high-voltage probe are disposed in the discharge circuit. The Rogowski coil probe is used to detect the current output signal during the impact process, which is included in the impact information. The two ends of the high-voltage probe are directly connected to the electrodes at both ends of the metal foil and are used to detect the voltage output signal during the impact process, which is included in the impact information and recorded and displayed by the digital oscilloscope. The pressure detection unit is used to detect the impact pressure electrical signal included in the impact information, which is recorded and displayed by the digital oscilloscope; The data processing unit is connected to the digital oscilloscope and is used to receive the battery performance parameters, the current output signal, the voltage output signal, and the impact pressure electrical signal transmitted by the digital oscilloscope, and to obtain the impact velocity and impact pressure based on the current output signal, the voltage output signal, and the impact pressure electrical signal; the data processing unit is also used to obtain the test results of the explosion-proof performance test based on the impact velocity, the impact pressure, and the battery performance parameters.

8. The system according to claim 7, characterized in that, The pressure detection unit includes a patch pressure sensor and a signal conditioning circuit, wherein the signal conditioning circuit is connected to the patch pressure sensor and the digital oscilloscope. The patch-type pressure sensor is disposed between the power battery and the battery mounting mold, and is used to acquire the pressure sensed during the impact and convert it into an impact pressure electrical signal, which is then transmitted to the signal conditioning circuit.

9. A method for testing the explosion-proof performance of a power battery, characterized in that, The power battery explosion-proof performance testing system according to any one of claims 1 to 8 comprises: Control the power battery under test to be in test mode; An instantaneous pulse current is output and transmitted to the metal foil to cause the metal foil to explode electrically, generating a shock wave. The shock wave propels the flying plate to impact the power battery at ultra-high speed. Obtain the impact information of the ultra-high-speed impact, and obtain the test results of the explosion-proof performance of the power battery based on the impact information.

10. A computer-readable storage medium, characterized in that, It stores computer-readable instructions, which, when executed by the computer's processor, cause the computer to perform the power battery explosion-proof performance testing method as described in claim 8.

Images