Battery high-speed impact detection method and system

Abstract

The invention discloses a battery high-speed impact detection method and system, and the method comprises the steps: transmitting high-speed impact with preset impact strength when a to-be-detected battery is in a test state; obtaining the impact speed of the high-speed impact and the impact pressure borne by the to-be-tested battery; acquiring strain information of the to-be-tested battery in the impact direction of high-speed impact; acquiring parameter variation of battery performance parameters of the to-be-tested battery in real time; obtaining an impact detection result based on the impact speed, the impact pressure, the strain information and the parameter variation; and determining a battery fault level corresponding to the high-speed impact based on the impact detection result. The high-speed impact environment possibly suffered by the battery in an actual accident can be accurately simulated, and the lithium ion battery impact test is realized by detecting various data in the impact process, so that the problems of difficulty in accurately controlling the applied load, low test speed and low test cost in the existing test are solved. The effect is not ideal; and the result is greatly different from the impact effect in practical application.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery performance detection, and in particular to a battery high-speed impact detection method and system. BACKGROUND

[0002] Since the advent of lithium-ion battery technology, the technology has been widely praised for its high energy density, high voltage, long life, and no memory effect. The wide application of lithium-ion batteries has penetrated into many industry fields such as portable computers, photographic and video equipment, mobile communication devices, and electric vehicles. When lithium-ion batteries are used as power sources, due to the diversity and unpredictability of the external environment, they must have excellent impact resistance to ensure the stability and safety of operation. Therefore, strict detection of the impact resistance of lithium-ion batteries is particularly important.

[0003] Currently, the impact resistance of lithium-ion batteries is generally detected by a battery detection heavy impact device in a patent CN105387983A and a drop hammer testing machine in a patent CN116296911A. Such tests aim to evaluate the performance of the battery under different impact speeds and impact pressures. However, this type of test method has certain limitations, for example, it is difficult to achieve precise control of constant strain rate loading or constant load. More importantly, in real-life major traffic accident scenarios, the impact speed that the battery may suffer is far beyond the speed range that the existing drop hammer testing machine can provide.

[0004] With the wide application of lithium-ion batteries in electric vehicles, unmanned aerial vehicles, and other high-speed mobile devices, especially in high-demand fields such as military and aerospace, the safety requirements for batteries are increasing, and the impact resistance of batteries is facing more stringent challenges. In view of the high-speed impact situation that lithium-ion batteries may encounter in actual application scenarios, such as traffic accidents, falls or impacts, traditional low-speed impact tests cannot accurately simulate such extreme situations.

[0005] Therefore, how to truly evaluate the safety of the battery under extreme conditions is a problem to be solved. SUMMARY

[0006] To solve the above problems, the embodiments of the present application provide a battery high-speed impact detection method and system.

[0007] In a first aspect, to solve the above technical problems, the present application provides a battery high-speed impact detection method, comprising: issuing a high-speed impact of a preset impact force when the battery to be tested is in a test state; an impact speed of the high-speed impact, and an impact pressure borne by the battery under action of the high-speed impact; obtaining strain information of the battery under action of the high-speed impact in an impact direction; real-time obtaining of a parameter variation of a battery performance parameter of the battery; obtaining an impact detection result based on the impact speed, the impact pressure, the strain information and the parameter variation; determining a battery failure level corresponding to the high-speed impact based on the impact detection result.

[0008] Beneficial effects are: In the technical scheme provided by the embodiment of the application, by emitting a high-speed impact with a preset impact force when the battery under test is in a test state, a very high strain rate can be achieved, so that the high-speed impact environment that the battery may suffer in an actual accident can be accurately simulated, and an extreme and real test environment is provided for the battery. Then, an impact speed of the high-speed impact is obtained, and an impact pressure borne by the battery under test under action of the high-speed impact is obtained. Strain information of the battery under test in an impact direction of the high-speed impact is obtained. A parameter variation of a battery performance parameter of the battery under test is obtained in real time. An impact detection result is obtained based on the impact speed, the impact pressure, the strain information and the parameter variation. Finally, a battery failure level corresponding to the high-speed impact is determined based on the impact detection result. That is, based on the simulated mechanical conditions similar to the high-speed impact that the battery may suffer in an actual accident, the specific influence of the impact speed, the impact pressure and the strain rate on the battery performance parameter is determined, so that the battery failure level under the high-speed impact environment is determined. In this way, the application solves the problems that in the existing lithium ion battery impact test, the applied load is difficult to accurately control, the test speed is low, and thus the lithium ion battery impact detection effect is not ideal, and there is a large difference between the detection result and the impact effect in actual application.

[0009] In a second aspect, the application provides a battery high-speed impact detection system, comprising a power output module, a pressure rod module, a charge-discharge test module and an information acquisition module. The power output module emits a high-speed impact with a preset impact force when the battery under test is in a test state. The pressure rod module impacts the battery under test under action of the high-speed impact to simulate a high-speed impact environment. The charge-discharge test module is configured to obtain a parameter variation of a battery performance parameter of the battery under test in real time. The information acquisition module comprises a collision rod speed detection unit, a pressure detection unit, a strain signal acquisition unit, a waveform storage and a data processing unit. The impact rod speed detection unit is configured to obtain an impact speed of the high-speed impact; the pressure detection unit is configured to obtain an impact pressure borne by the battery under test under the high-speed impact; the strain signal acquisition unit is configured to obtain strain information of the battery under test in an impact direction of the high-speed impact; the waveform storage is configured to receive the parameter variation amount transmitted by the charge-discharge test module; the data processing unit is configured to obtain an impact detection result based on the impact speed, the impact pressure, the strain information and the parameter variation amount, and determine a battery failure level corresponding to the high-speed impact based on the impact detection result.

[0010] It should be understood that the general description above and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0011] The drawings incorporated into the specification and forming a part thereof, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application. It is to be expressly understood that the drawings are only exemplary and are, therefore, not to be considered as limiting upon the scope as set forth in the appended claims. In the drawings: Figure 1 is a flow chart of a battery high-speed impact detection method according to an exemplary embodiment of the present application; Figure 2 is a block diagram of a battery high-speed impact detection system according to an exemplary embodiment of the present application; Figure 3 is a schematic diagram of the positional relationship between components of a battery high-speed impact detection system according to an embodiment of the present application; Figure 4 is a schematic diagram of a power output module when the power source device is a pneumatic driving device according to an embodiment of the present application; Figure 5 is a schematic diagram of a power output module when the power source device is an electromagnetic driving device according to an embodiment of the present application; Figure 6 is a schematic diagram of the signal transmission relationship between components of a battery high-speed impact detection system according to an embodiment of the present application; Figure 7 is a structural schematic diagram of a computer system of an electronic device suitable for implementing embodiments of the present application. DETAILED DESCRIPTION

[0012] The exemplary embodiments will be described in detail below with reference to the drawings. In the following description, the same numbers are used to denote the same elements throughout the several views. The embodiments described in the following exemplary embodiments are not meant to represent all implementations consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0013] The block diagrams shown in the drawings are merely 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.

[0014] The flowcharts shown in the drawings are merely exemplary illustrations, and do not necessarily include all contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be further divided, and some operations / steps can be combined or partially combined, so the actual execution order can be changed according to the actual situation.

[0015] In the present application, "a plurality of" means two or more. The association relationship of "and / or" describes the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.

[0016] In order to solve the problem that the current impact resistance detection of lithium ion batteries cannot realize the precise control of constant strain rate loading or constant load, and cannot accurately simulate the extreme situations such as high-speed impact that lithium ion batteries may encounter in actual application scenarios, the embodiments of the present application propose a battery high-speed impact detection method and system, electronic equipment, and computer readable storage medium, which are mainly related to battery high-speed impact detection technology included in lithium battery performance detection technology. The embodiments will be described in detail below.

[0017] First, please refer to Figure 1 , Figure 1 is a flowchart of a battery high-speed impact detection method according to an exemplary embodiment of the present application. The method can be specifically executed by a server, and the corresponding equipment is controlled by the server to complete impact detection. The server can be an independent server, or a cloud server providing cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, content delivery networks (Content Delivery Network, CDN), and basic cloud computing services such as big data and artificial intelligence platforms. This place is not limited.

[0018] As Figure 1 shown in the figure, in an exemplary embodiment, the battery high-speed impact detection method can include steps S101 to S106, which are described in detail as follows: Step S101, when the battery to be tested is in a test state, a high-speed impact with a preset impact degree is sent.

[0019] In this embodiment, when battery high-speed impact detection of the battery to be tested is needed, the battery to be tested is first controlled to reach a stable test state to avoid the influence of other states of the battery to be tested on the detection result, thereby ensuring the accuracy of the battery high-speed impact detection.

[0020] Step S102, the impact speed of the high-speed impact and the impact pressure of the battery to be tested under the action of the high-speed impact are obtained.

[0021] Step S103, the strain information of the battery to be tested in the impact direction of the high-speed impact is obtained.

[0022] Step S104, the parameter change amount of the battery performance parameters of the battery to be tested is obtained in real time.

[0023] Step S105, the impact detection result is obtained based on the impact speed, the impact pressure, the strain information and the parameter change amount.

[0024] In this embodiment, after the high-speed impact with the preset impact degree is sent and applied to the battery to be tested, the battery to be tested is simulated to be subjected to an impact with the preset impact degree in a corresponding high-speed impact environment, and in this process, the impact speed of the high-speed impact, the impact pressure of the battery to be tested under the action of the high-speed impact, the strain information of the battery to be tested in the impact direction of the high-speed impact and the parameter change amount of various battery performance parameters of the battery to be tested before and after being impacted are obtained, wherein the battery performance parameters can include the current, voltage and internal resistance of the battery.

[0025] The impact detection result is obtained by using the obtained impact speed, impact pressure, strain information and parameter change amount, and the impact detection result represents the state change and battery performance change of the battery to be tested after being subjected to the high-speed impact with the preset impact degree compared with before being impacted.

[0026] Step S106, the battery failure level corresponding to the high-speed impact is determined based on the impact detection result.

[0027] Since the impact detection result represents the state change and battery performance change of the battery to be tested before and after being impacted, after the impact detection result is obtained, the battery failure level of the battery to be tested under the high-speed impact can be determined according to the preset determination standard.

[0028] It can be seen from the above that, in the method provided in the embodiment, on the one hand, a high-speed impact of a preset impact degree is emitted when the battery to be tested is in a test state, so that a very high strain rate can be achieved, thereby accurately simulating the high-speed impact environment that the battery may suffer in an actual accident and providing an extreme and real test environment for the battery. On the other hand, the impact speed of the high-speed impact and the impact pressure borne by the battery to be tested under the action of the high-speed impact are obtained; the strain information of the battery to be tested in the impact direction of the high-speed impact is obtained; the parameter variation of the battery performance parameter of the battery to be tested is obtained in real time; the impact detection result is obtained based on the impact speed, the impact pressure, the strain information and the parameter variation; and finally, the battery failure level corresponding to the high-speed impact is determined based on the impact detection result. That is, based on the simulated mechanical conditions similar to the high-speed impact that the battery may suffer in an actual accident, the specific influence of the impact speed, the impact pressure and the strain rate on the battery performance parameter is determined, so as to determine the battery failure level under the high-speed impact environment.

[0029] Therefore, the application can accurately evaluate the changes of various data of the battery under high-speed impact, obtain the impact detection result by analyzing the obtained various data and determine the battery failure level, deeply understand the failure or failure mode of the battery under extreme conditions, and then the impact resistance of the battery can be optimized, so as to effectively improve the accident prevention and response measures, provide important data support for battery design and material improvement. The problem that the load in the existing lithium ion battery impact test is difficult to accurately control and the test speed is low, thereby resulting in an unsatisfactory lithium ion battery impact detection effect and a large difference between the detection result and the impact effect in actual application is solved.

[0030] In addition, high-speed impact testing helps to identify potential weak links, effectively reduces the risk of battery failure under high-speed impact, ensures user safety, and at the same time, helps to update safety standards and regulations to adapt to the development of new technologies and market demand, enhances the confidence of consumers in lithium ion battery products, and promotes the healthy development of the market.

[0031] In an example embodiment provided by the application, the specific steps of emitting a high-speed impact of a preset impact degree can include: performing charge and discharge cycles on the battery to be tested, so that the battery to be tested is in a test state; In the test state, the power source device drives the impact rod to emit a high-speed impact of a preset impact degree based on the detection requirements.

[0032] In this embodiment, the battery is subjected to charge and discharge cycles to reach a stable test state. When a detection requirement for the battery under test is received in the test state, the power source device is activated to drive the impact rod at a preset speed based on the detection requirement, thereby generating a high-speed impact with a preset impact force to impact the battery under test, accurately simulating the high-speed impact environment that the battery may be subjected to in an actual accident, and providing an extreme and realistic test environment for the battery.

[0033] In another exemplary embodiment, the power source device is a gas pressure driving device or an electromagnetic driving device. Therefore, the specific steps of generating a high-speed impact with a preset impact force can include: In the test state, configuring a target gas release pressure of the gas pressure driving device based on the detection requirement; Using the gas pressure driving device to generate a high-speed impact with a preset impact force by driving the impact rod with the target gas release pressure; Or in the test state, configuring discharge current parameters, coil parameters, and ferromagnetic body positions of the electromagnetic driving device based on the detection requirement to obtain a corresponding target electromagnetic force; Using the electromagnetic driving device to generate a high-speed impact with a preset impact force by driving the impact rod with the target electromagnetic force.

[0034] The gas pressure driving device includes a high-pressure cylinder, and the high-pressure gas in the high-pressure cylinder is compressed nitrogen. The gas pressure released in the launch cylinder pushes the impact rod to move forward along the launch pipeline at the moment of launching, so that the impact rod generates a high-speed impact. By adjusting the size of the gas release pressure, the impact speed of the impact rod can be accurately controlled, and the calculation formula is as follows: In the formula, m is the mass of the impact rod; η is the energy conversion efficiency; P0 is the gas pressure in the high-pressure cylinder; V is the volume of the gas in the high-pressure cylinder; and v0 is the initial speed of the impact rod.

[0035] When the power source device is a gas pressure driving device, in the test state, the target gas release pressure of the gas pressure driving device is configured based on the detection requirement using the above calculation formula, and then the gas pressure driving device is used to generate a high-speed impact with a preset impact force by driving the impact rod with the target gas release pressure.

[0036] The electromagnetic driving device is composed of a solenoid driving coil and an impact rod made of ferromagnetic material that can be driven by an electromagnetic signal. After the solenoid driving coil is energized, the impact rod is accelerated under the action of magnetic force to generate a high-speed impact. The size of the electromagnetic signal can be controlled by adjusting the discharge current parameters, adjusting the coil parameters, and controlling the position of the ferromagnetic body, thereby controlling the speed of the impact rod. The calculation formula is as follows: In the formula, L is the inductance of the coil; I0 is the maximum value of the current; t is the time; τ is the time constant; m is the mass of the impact rod; and v0(t) is the initial speed of the impact rod.

[0037] When the power source device is an electromagnetic driving device, in the test state, the discharge current parameter, the coil parameter, and the ferromagnetic body position of the electromagnetic driving device are configured based on the detection requirement by using the above calculation formula to obtain the corresponding target electromagnetic force, and then the target electromagnetic force is used to drive the impact rod to generate the preset impact force of the high-speed impact.

[0038] In an example embodiment provided in the application, the specific steps of detecting the impact speed of the high-speed impact and the impact pressure borne by the battery under test under the action of the high-speed impact can include: The moving speed of the impact rod after being driven is detected by using the photoelectric target method, and the impact speed of the high-speed impact is obtained based on the moving speed. A plurality of pressure parameters generated by a plurality of patch type pressure sensors at the bottom of the battery under test under the action of the high-speed impact are obtained, and the impact pressure is obtained based on the plurality of pressure parameters.

[0039] In the embodiment, the impact speed of the high-speed impact is measured by using the photoelectric target method to measure the moving speed of the impact rod after being driven. Specifically, when the impact rod cuts off the light at the first grating, a voltage change signal is generated. After flying for a period of time, the impact rod cuts off the light at the second grating, and another voltage change signal is generated. That is, when the impact rod passes through each grating, a voltage change signal will be generated respectively. Since the distance L between the gratings is known, the voltage change time T1 and T2 are determined by recording the voltage change signal of the photoelectric switch, and the moving speed of the impact rod, that is, the impact speed v0, is: The impact pressure is measured by using the patch type pressure sensor at the bottom of the battery. First, the average value of the stable pressure parameters collected at a plurality of positions at the bottom of the battery before the impact is recorded as the initial pressure parameter. After being impacted, a plurality of pressure parameters applied to the battery under test are directly sensed by the patch type pressure sensor, and each parameter is converted into a voltage signal. The voltage signal change amount is determined based on the initial pressure parameter and the plurality of pressure parameters, so as to obtain the impact pressure. 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 signal change amount transmitted by the patch type pressure sensor before and after the battery under test is impacted; and G is the sensitivity of the patch type pressure sensor.

[0040] In an example embodiment provided by the present application, the step after the high-speed impact with the preset impact force can further include: The high-speed impact is pulse-shaped to obtain an incident wave for impacting the battery under test.

[0041] In the embodiment, before impacting the battery under test, the high-speed impact is pulse-shaped by a shaper to obtain an incident wave for impacting the battery under test, thereby prolonging the rising edge time of the pulse transmitted to the battery under test, making the battery under test bear force uniformly, and obtaining constant strain rate loading.

[0042] In another example embodiment, the specific steps of obtaining the strain information of the battery under test in the impact direction of the high-speed impact can include: obtaining a reflected wave and a transmitted wave formed after the incident wave penetrates the battery under test; determining the dynamic stress-strain relationship of the battery under test according to a one-dimensional stress wave theory; calculating the strain rate, strain and stress corresponding to the incident wave, reflected wave and transmitted wave based on the dynamic stress-strain relationship as the strain information.

[0043] In the embodiment, after the high-speed impact is transmitted to the input rod through the shaper, a compressed stress pulse, i.e., an incident wave, will be generated in the input rod. Then the incident wave continues to propagate in the rod, when the incident wave reaches the battery under test, the battery under test is impacted to deform at high speed, and transmits a transmitted wave to the output rod, and reflects a reflected wave back to the input rod. According to the one-dimensional stress wave theory, the dynamic stress-strain relationship of the target battery is determined using the three-wave method equation, and the calculation formula is as follows: In the formula, is the strain rate of the battery under test; ε(t) is the strain of the battery under test; σ(t) is the stress of the battery under test; A, A0, L0, E respectively represent: the cross-sectional area of the rod, the initial cross-sectional area of the rod, the initial length of the specimen, the elastic modulus; C0 is the elastic longitudinal wave velocity in the rod; ε i refers to the incident wave strain value, ε r refers to the reflected wave strain value, and ε t refers to the transmitted wave strain value.

[0044] In addition, after the incident wave strain value ε i is determined, according to the one-dimensional stress wave theory, the impact velocity v and the impact acceleration a acting on the battery under test are respectively: .

[0045] In an example embodiment provided by the present application, the specific steps of determining the battery failure level corresponding to the high-speed impact can include: obtaining a plurality of failure levels configured in advance; determining the battery failure level corresponding to the deformation degree and the charge-discharge performance from the plurality of failure levels.

[0046] In the embodiment, the plurality of failure levels configured in advance include a first level, a second level and a third level, and the corresponding battery failure level is determined as follows: If the deformation degree included in the impact detection result of the battery to be tested after the high-speed impact represents that there is no obvious external structural deformation, and the charge-discharge performance represents that the battery to be tested can normally perform the charge-discharge cycle test, but the battery capacity and the service life have a small decrease, then the battery failure level is determined as the first level; If the deformation degree included in the impact detection result of the battery to be tested after the high-speed impact represents that there is partial obvious external failure, and the charge-discharge performance represents that the battery to be tested can temporarily perform the charge-discharge cycle, but the battery capacity and the service life have a significant decrease and are accompanied by data anomalies, then the battery failure level is determined as the second level; If the deformation degree included in the impact detection result of the battery to be tested after the high-speed impact represents that the external failure is obvious, and the charge-discharge performance represents that the battery to be tested cannot perform the charge-discharge cycle, then the battery failure level is determined as the third level.

[0047] In this way, the technical solution of the embodiment of the present application determines the battery failure level by analyzing the deformation degree and the charge-discharge performance of the battery to be tested represented by the impact detection result, deeply understands the failure or failure mode of the battery under extreme conditions, and can then optimize the impact resistance of the battery in a targeted manner, thereby effectively improving the accident prevention and response measures, and providing important data support for battery design and material improvement.

[0048] Figure 2 is a block diagram of a battery high-speed impact detection system according to an example embodiment of the present application. As shown in Figure 2 The system includes a power output module, a pressure rod module, a charge-discharge test module and an information acquisition module, and realizes the battery high-speed impact detection for the battery to be tested. The power output module sends a high-speed impact with a preset impact force when the battery to be tested is in a test state; the pressure rod module impacts the battery to be tested under the action of the high-speed impact to simulate a high-speed impact environment; The charge-discharge test module is used to obtain the parameter variation of the battery performance parameters of the battery to be tested in real time; during the execution of the high-speed impact test of the battery to be tested, the charge-discharge test module is a charge-discharge tester, undertakes the charge-discharge cycle and the test task of the battery performance, and transmits the key performance parameters such as the current, the voltage and the internal resistance of the battery to the waveform storage in the information acquisition module.

[0049] The information acquisition module comprises a striking rod speed detection unit, a pressure detection unit, a strain signal acquisition unit, a waveform memory and a data processing unit; The striking rod speed detection unit is used to obtain the impact speed of high-speed impact; The pressure detection unit is used to obtain the impact pressure borne by the battery under test under the action of high-speed impact; The strain signal acquisition unit is used to obtain the strain information of the battery under test in the impact direction of high-speed impact; The waveform memory is used to receive the parameter variation amount transmitted by the charge-discharge test module; The data processing unit is used to obtain the impact detection result based on the impact speed, the impact pressure, the strain information and the parameter variation amount, and determine the battery failure level corresponding to high-speed impact based on the impact detection result.

[0050] The system applies the battery high-speed impact detection method provided in the application, and through the power output module, high-speed impact driving pressure rod module is driven to impact the battery under test at a preset impact degree when the battery under test is in a test state, so that a very high strain rate can be achieved, thereby accurately simulating the high-speed impact environment that the battery may suffer in an actual accident, and providing an extreme and real test environment for the battery. On the other hand, the information acquisition module is used to obtain the impact speed of high-speed impact, the impact pressure borne by the battery under test under the action of high-speed impact, and the strain information of the battery under test in the impact direction of high-speed impact; and the charge-discharge test module is used to obtain the parameter variation amount of the battery performance parameter of the battery under test in real time. Finally, the data processing unit included in the information acquisition module is used to obtain the impact detection result based on the impact speed, the impact pressure, the strain information and the parameter variation amount; and the battery failure level corresponding to high-speed impact is determined based on the impact detection result.

[0051] In addition, the design principle of the battery high-speed impact detection magnet of the application is relatively simple, the equipment is less, and the operation and maintenance are easy; the test process is very fast, so that fast data acquisition can be realized, a large number of experiments can be carried out, and good repeatability is achieved, which helps to verify the accuracy of experimental results; generally carried out in a closed system, relatively safer in the operation process compared with other impact loading devices; the length, diameter and material of the rod, and the mass and speed of the striking rod can be adjusted as needed to adapt to different test requirements; stable operation, easy to control the operation precision, easy to control the loading waveform and convenient signal measurement, etc.

[0052] Please refer to Figure 3 , Figure 3 is a schematic diagram of the positional relationship between the components of the battery high-speed impact detection system in an embodiment of the application.

[0053] AsFigure 3 As shown, in this embodiment, the power output module includes a power source device and an impact rod. In the test state, the power source device drives the impact rod to emit a high-speed impact with a preset impact force based on the test requirements.

[0054] In addition, in this embodiment, the power source device is a pneumatic drive device or an electromagnetic drive device. For example... Figure 4 As shown, Figure 4 This is a schematic diagram of the power output module when the power source device is a pneumatic drive device in one embodiment of this application. The pneumatic drive device includes a high-pressure cylinder, and the high-pressure gas in the high-pressure cylinder is compressed nitrogen. The instant the gas pressure in the launching cylinder is released, it pushes the impact rod forward along the launching pipe, so that the impact rod emits a high-speed impact. Figure 5 As shown, Figure 5 This is a schematic diagram of the power output module when the power source device is an electromagnetic drive device in one embodiment of this application. The electromagnetic drive device consists of a solenoid drive coil and an impact rod made of ferromagnetic material that can be driven by an electromagnetic signal. After the solenoid drive coil is energized, the impact rod is accelerated under the action of magnetic force, so that the impact rod emits a high-speed impact.

[0055] like Figure 3 As shown, in this embodiment, the impact rod velocity detection unit includes a grating and a velocity measuring circuit. The velocity measuring circuit is used to generate a voltage change signal when the impact rod cuts the grating using the photoelectric target method. The voltage change signal is transmitted to the waveform memory through the signal line, and the data processing unit processes and analyzes the voltage change signal to obtain the impact velocity of the high-speed impact.

[0056] The pressure detection unit includes a signal conditioning circuit and multiple surface-mount pressure sensors located on the bottom of the battery under test. The surface-mount pressure sensors are used to acquire multiple pressure parameters generated under high-speed impact. The signal conditioning circuit amplifies, filters, and linearizes the multiple pressure parameters, and then transmits the multiple pressure parameters to the waveform memory through the signal line. The data processing unit processes and analyzes the multiple pressure parameters to obtain the impact pressure.

[0057] The pressure bar module includes a shaper, an input rod, an output rod, and an absorption base. The battery under test is placed between the input rod and the output rod, and the absorption base is connected to the output rod. The shaper is located at the end of the input rod that contacts the impact rod and is used to perform pulse shaping processing on the high-speed impact to obtain the incident wave that is transmitted to the input rod so that the incident wave can impact the battery under test.

[0058] The strain signal acquisition unit comprises a resistance strain gauge and an ultra-dynamic strain amplifier; the resistance strain gauge is arranged at the surface center of the input rod and the output rod, and is used to acquire the strain signal generated when the incident wave transmits into the input rod and the reflected wave and the transmitted wave are formed after the incident wave penetrates the battery to be tested; the ultra-dynamic strain amplifier amplifies the strain signal, and then transmits the strain signal to the waveform memory through a signal line, and the data processing unit processes and analyzes the strain signal to obtain the strain information of the battery to be tested.

[0059] The impact rod, the input rod and the output rod are bearing steel materials of the same material. Before the test starts, the level state of the impact rod, the input rod and the output rod also needs to be accurately calibrated by using a level meter, so as to ensure the accuracy and repeatability of the test. The absorbing base is generally composed of double-layer circular plastic parts, the outer layer is a hard plastic material, and the inner layer is a soft plastic material, so as to effectively absorb the kinetic energy after impact, reduce the secondary wave loading effect, and prevent accidents.

[0060] Please refer to Figure 6 , Figure 6 is a schematic diagram of the signal transmission relationship between the components of the battery high-speed impact detection system in an embodiment of the application. As shown in Figure 6 , in the test state, the power source device drives the impact rod to emit a high-speed impact with a preset impact force based on the detection requirements, the shaper performs pulse shaping processing on the high-speed impact to obtain the incident wave, the input rod transmits the incident wave to impact the battery to be tested, the incident wave penetrates the battery to be tested to form the reflected wave and the transmitted wave transmitted to the output rod, and the absorbing base absorbs the kinetic energy after impact.

[0061] In this process, the speed measurement circuit is used to generate a voltage change signal when the impact rod cuts off the grating by using the photoelectric target method, and the voltage change signal is transmitted to the waveform memory through a signal line; the patch type pressure sensor acquires a plurality of pressure parameters generated under the action of the high-speed impact, and the signal conditioning circuit amplifies, filters and linearizes the plurality of pressure parameters, and then transmits the plurality of pressure parameters to the waveform memory through a signal line; the resistance strain gauge acquires the strain signal generated when the incident wave, the reflected wave and the transmitted wave, and the ultra-dynamic strain amplifier amplifies the strain signal, and then transmits the strain signal to the waveform memory through a signal line; the charge and discharge tester acquires the parameter change amount of the battery performance parameter of the battery to be tested in real time.

[0062] The waveform memory transmits the received data to the data processing unit to process and analyze the data to obtain the impact speed, impact pressure, strain information and parameter change amount, and then analyzes the impact detection result, and determines the battery fault level corresponding to the high-speed impact based on the impact detection result.

[0063] It should be noted that the battery high-speed impact detection system provided by the above-mentioned embodiments and the battery high-speed impact detection method provided by the above-mentioned embodiments belong to the same concept, wherein the specific manner in which each module and unit performs operations has been described in detail in the method embodiments, and will not be described here. The battery high-speed impact detection system provided by the above-mentioned embodiments can be used in actual applications, and the above-mentioned functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above, and this is not limited herein.

[0064] 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 battery high-speed impact detection method provided in each of the above-mentioned embodiments.

[0065] Figure 7 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 7 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.

[0066] As Figure 7 shown, the computer system 700 includes a central processing unit (CPU) 701, which can perform various appropriate actions and processes according to programs stored in a read-only memory (ROM) 702 or programs loaded from a storage portion 708 into a random access memory (RAM) 703, such as performing the methods in the above-mentioned embodiments. In the RAM 703, various programs and data required for system operation are also stored. The CPU 701, the ROM 702, and the RAM 703 are connected to each other through a bus 704. An input / output (I / O) interface 705 is also connected to the bus 704.

[0067] The following components are connected to the I / O interface 705: an input part 706 including a keyboard, a mouse, etc.; an output part 707 including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), etc., and a speaker, etc.; a storage part 708 including a hard disk, etc.; and a communication part 709 including a network interface card such as a LAN (Local Area Network) card, a modem, etc. The communication part 709 performs communication processing via a network such as the Internet. A drive 710 is also connected to the I / O interface 705 as necessary. A removable medium 711 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc. is attached to the drive 710 as necessary, so that a computer program read out therefrom is installed in the storage part 708 as necessary.

[0068] In particular, according to 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 containing a computer program for executing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network by the communication part 709, and / or installed from the removable medium 711. When the computer program is executed by the central processing unit (CPU) 701, various functions defined in the system of the present application are executed.

[0069] It should be noted that the computer-readable medium in the embodiments shown in the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the two. The computer-readable storage medium may, for example, be an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or component, or any combination of the above. More specific examples of computer-readable storage media 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 disk read-only memory (Compact Disc Read-Only Memory, CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, the computer-readable signal medium can include a data signal propagating 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 various forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. 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 programs for use by or in connection with an instruction execution system, device or component. 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 of the above.

[0070] 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 order than that shown 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.

[0071] The modules and units involved in the embodiments of the present application can be implemented in the form of software, or can be implemented in the form of hardware, and the described modules and units can also be arranged in a processor. In some cases, the names of these modules and units do not constitute a limitation on the modules and units themselves.

[0072] Another aspect of the present application also provides a computer readable storage medium, which stores a computer program. The computer program is executed by a processor to implement the battery high-speed impact detection method as described above. The computer readable storage medium can be included in the electronic device described in the above embodiments, or can exist separately and not be assembled into the electronic device.

[0073] 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 enable the computer device to perform the battery high-speed impact detection method provided in each of the above embodiments.

[0074] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for detecting high-speed impact on a battery, characterized in that, The method includes: When the battery under test is in the test state, a high-speed impact of preset impact force is emitted; The impact velocity of the high-speed impact and the impact pressure that the battery under test experiences under the high-speed impact are obtained. Obtain strain information of the battery under test in the impact direction of the high-speed impact; The changes in the battery performance parameters of the battery under test are acquired in real time. The impact detection result is obtained based on the impact velocity, the impact pressure, the strain information, and the parameter changes; The battery fault level corresponding to the high-speed impact is determined based on the impact detection results.

2. The method according to claim 1, characterized in that, The step of delivering a high-speed impact of a preset impact force while the battery under test is in the test state includes: The battery under test is subjected to charge-discharge cycles to bring it into a test state. In the test state, the impact rod is driven by a power source device to deliver a high-speed impact with a preset impact force based on the test requirements.

3. The method according to claim 2, characterized in that, The power source device is a pneumatic drive device or an electromagnetic drive device. In the test state, the power source device drives the impact rod to deliver a high-speed impact with a preset impact force based on the detection requirements, including: Under the test conditions, the target venting pressure of the pneumatic drive device is configured based on the detection requirements; The air pressure driving device is used to generate the target deflation pressure to drive the impact rod to generate a high-speed impact with a preset impact force; Alternatively, under the test state, the discharge current parameters, coil parameters, and ferromagnetic body position of the electromagnetic drive device are configured based on the detection requirements to obtain the corresponding target electromagnetic force; The electromagnetic drive device is used to generate the target electromagnetic force to drive the impact rod to deliver a high-speed impact with a preset impact force.

4. The method according to claim 2, characterized in that, The acquisition of the impact velocity of the high-speed impact and the impact pressure borne by the battery under test under the high-speed impact includes: The moving speed of the impact rod after it is driven is detected by photoelectric target method, and the impact speed of the high-speed impact is obtained based on the moving speed. Multiple pressure parameters generated by multiple patch-type pressure sensors at the bottom of the battery under test under the action of the high-speed impact are obtained, and the impact pressure is obtained based on the multiple pressure parameters.

5. The method according to claim 1, characterized in that, After delivering a high-speed impact with a preset impact force, the method further includes: The high-speed impact is pulse-shaped to obtain an incident wave, which is then used to impact the battery under test.

6. The method according to claim 5, characterized in that, The process of obtaining strain information of the battery under test in the impact direction of the high-speed impact includes: The reflected and transmitted waves formed after the incident wave penetrates the battery under test are obtained; Based on the one-dimensional stress wave theory, the dynamic stress-strain relationship of the battery under test is determined. Based on the dynamic stress-strain relationship, the strain rate, strain, and stress corresponding to the incident wave, the reflected wave, and the transmitted wave are calculated as strain information.

7. The method according to claim 1, characterized in that, The impact detection results include the degree of deformation and charge / discharge performance; determining the battery fault level corresponding to the high-speed impact based on the impact detection results includes: Obtain multiple pre-configured fault levels; A battery fault level corresponding to the degree of deformation and the charge / discharge performance is determined from the plurality of fault levels.

8. A high-speed impact detection system for batteries, characterized in that, The battery high-speed impact detection method according to any one of claims 1 to 7, wherein the battery high-speed impact detection system includes a power output module, a pressure rod module, a charge-discharge test module, and an information acquisition module; When the battery under test is in a test state, the power output module emits a high-speed impact with a preset impact force; the pressure bar module impacts the battery under test under the action of the high-speed impact to simulate a high-speed impact environment. The charge / discharge test module is used to acquire the changes in the battery performance parameters of the battery under test in real time. The information acquisition module includes an impact rod velocity detection unit, a pressure detection unit, a strain signal acquisition unit, a waveform memory, and a data processing unit; The impact rod velocity detection unit is used to obtain the impact velocity of the high-speed impact; The pressure detection unit is used to obtain the impact pressure that the battery under test is subjected to under the high-speed impact. The strain signal acquisition unit is used to acquire the strain information of the battery under test in the impact direction of the high-speed impact; The waveform memory is used to receive the parameter changes transmitted by the charge / discharge test module; The data processing unit is used to obtain the impact detection result based on the impact velocity, the impact pressure, the strain information, and the parameter change; and to determine the battery fault level corresponding to the high-speed impact based on the impact detection result.

9. The system according to claim 8, characterized in that, The power output module includes a power source device and an impact rod, wherein the power source device is a pneumatic drive device or an electromagnetic drive device. The charge-discharge test module is also used to perform charge-discharge cycles on the battery under test so that the battery under test is in a test state. Under the test conditions, the power source device drives the impact rod to emit a high-speed impact with a preset impact force based on the detection requirements; The impact rod velocity detection unit includes a grating and a velocity measuring circuit. The velocity measuring circuit is used to generate a voltage change signal when the impact rod cuts the grating using a photoelectric target method. The voltage change signal is transmitted to a waveform memory through a signal line, and the data processing unit processes and analyzes the voltage change signal to obtain the impact velocity of the high-speed impact. The pressure detection unit includes a signal conditioning circuit and multiple patch pressure sensors disposed on the bottom of the battery under test. The patch pressure sensors are used to acquire multiple pressure parameters generated under the action of the high-speed impact. The signal conditioning circuit amplifies, filters, and linearizes the multiple pressure parameters, and then transmits the multiple pressure parameters to the waveform memory through a signal line. The data processing unit processes and analyzes the multiple pressure parameters to obtain the impact pressure.

10. The system according to claim 9, characterized in that, The pressure bar module includes a shaper, an input rod, an output rod, and an absorption base. The battery under test is placed between the input rod and the output rod, and the absorption base is connected to the output rod. The shaper is located at the end of the input rod that contacts the impact rod, and is used to perform pulse shaping processing on the high-speed impact to obtain an incident wave that is transmitted to the input rod so as to impact the battery under test using the incident wave; The strain signal acquisition unit includes a resistance strain gauge and an ultra-dynamic strain amplifier; The resistance strain gauge is disposed at the center of the surface of the input rod and the output rod, and is used to acquire the strain signal generated when the incident wave enters the input rod and when the incident wave penetrates the battery under test to form reflected wave and transmitted wave. The ultra-dynamic strain amplifier amplifies the strain signal and transmits it to the waveform memory via a signal line. The data processing unit then processes and analyzes the strain signal to obtain the strain information of the battery under test.

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