Battery internal safety test method, device, equipment and storage medium

Abstract

The application discloses a battery internal safety test method, device, equipment and storage medium, and belongs to the technical field of battery safety. The method firstly determines a simulated impact position, controls the position change of the battery cell in the local position through the cell lifting device externally arranged on the battery pack, simulates the contact and extrusion of the battery cell and the shell under the vehicle impact condition, and monitors the temperature, voltage and abnormal sound and other key indicators of the battery in real time during the displacement of the battery cell, so as to capture any abnormal phenomenon. If no abnormality occurs during the displacement process, further extrusion stress is applied to simulate the extrusion caused by the impact, until the preset test value is reached. Whether abnormal phenomenon occurs in the process of the cell rising to extrusion and the timing of the abnormal phenomenon are observed, so as to judge the safety performance of the battery. Through the above steps, the displacement and extrusion of the battery cell caused by the impact are simulated, and the phenomenon and data analysis in the battery are combined, so that the safety performance of the battery under the extreme scene can be effectively evaluated.

Description

Technical Field

[0001] This invention relates to the field of battery safety technology, and in particular to a method, apparatus, equipment and storage medium for testing the internal safety of a battery. Background Technology

[0002] With the rapid development of electric vehicles, battery safety has become an increasingly important issue. As the core energy source of electric vehicles, the safety of the battery directly affects the safety of passengers and the reliability of the vehicle. Among various potential safety threats, the risk of internal short circuits in batteries during external impacts is particularly prominent. The structural integrity of the battery pack and the stability of the battery cells during a vehicle collision are key factors in ensuring battery safety.

[0003] Currently, battery safety testing mainly focuses on electrochemical performance and thermal stability. However, testing methods for battery performance under mechanical impact, especially short circuits caused by cell displacement, are still immature. In actual vehicle accidents, battery packs may deform due to impact, leading to internal cell displacement or even short circuits, potentially causing fires or even explosions with serious consequences. Therefore, developing a testing method that can simulate internal cell displacement and short circuits under vehicle impact conditions is of great significance for evaluating and improving battery safety.

[0004] However, existing battery safety testing technologies have not adequately addressed how to simulate the impact of vehicle collisions on the battery's internal structure in a controlled environment and accurately assess the battery's impact resistance performance. Therefore, designing a testing method and equipment capable of simulating cell displacement and short circuits caused by impacts within a vehicle battery pack to accurately evaluate the battery system's impact resistance performance has become a pressing technical challenge in this field. Summary of the Invention

[0005] The main objective of this invention is to provide a battery internal safety testing method, apparatus, device, and storage medium, aiming to solve the technical problem of how to design a testing method and device that can simulate cell displacement and short circuit caused by impact within a vehicle battery pack, so as to accurately evaluate the impact resistance safety performance of the battery system.

[0006] To achieve the above objectives, the present invention provides a battery internal safety testing method, the battery internal safety testing method comprising:

[0007] The cell lifting device is controlled to move the target cell toward the upper casing of the battery under test, and safety performance data is obtained during the displacement of the target cell.

[0008] Based on the safety performance data, the safety performance evaluation result of the battery under test is obtained.

[0009] Optionally, before the control cell lifting device moves the target cell toward the upper casing of the battery under test, it further includes:

[0010] The target cells in the cell array are determined based on the simulated impact locations in the test mission.

[0011] The lower casing of the target battery cell is replaced with the battery cell lifting device to achieve control over the spatial position of the target battery cell;

[0012] After the internal electrical environment of the battery under test reaches a stable state, the step of controlling the cell lifting device to move the target cell toward the upper casing of the battery under test is executed.

[0013] Optionally, the control cell lifting device moves the target cell toward the upper casing of the battery under test, and acquires safety performance data during the displacement of the target cell, including:

[0014] The target cell is moved toward the upper casing of the battery under test in the first round, so that the gap between the cell terminal of the target cell and the upper casing is reduced to the preset short-circuit test distance.

[0015] If no abnormality occurs in the first round of displacement, the second round of displacement is carried out to gradually reduce the gap between the cell terminal of the target cell and the upper shell, and the displacement stops when it comes into contact with the upper shell.

[0016] Obtain safety performance data from the first round of cell displacement and / or the second round of cell displacement, wherein the safety performance data includes the change in internal battery temperature, the change in the target cell supply voltage, and the number of abnormal noises inside the battery.

[0017] Optionally, after stopping the displacement upon contact with the upper housing, the method further includes:

[0018] If no abnormal phenomena occur during the second round of cell displacement, the cell lifting device is controlled to generate compressive stress between the target cell and the upper shell.

[0019] When the compressive stress rises to the simulated deformation compressive test value, the compressive stress is unloaded after the current compressive stress reaches the preset load duration to complete the simulated impact deformation test.

[0020] Optionally, obtaining the safety performance evaluation result of the battery under test based on the safety performance data includes:

[0021] If one or more of the safety performance data fail to meet the preset safety performance index during the first round of cell displacement, the safety level of the battery under test is deemed insufficient.

[0022] If one or more of the safety performance data fail to meet the preset safety performance index during the second round of cell displacement, the safety level of the battery under test is judged to be average.

[0023] If the safety performance data in both the first and second rounds of cell displacement meet the preset safety performance indicators, then the safety level of the battery under test is judged to be good.

[0024] Optionally, in the simulated impact deformation test, if the battery under test exhibits an abnormal phenomenon during the stage of rising compressive stress, the safety performance data may also include the magnitude of the compressive stress at the time of the abnormal phenomenon.

[0025] If the battery under test exhibits an abnormal phenomenon during the extrusion stress load stage, the safety performance data also includes the extrusion stress being the steady-state load duration from the simulated deformation extrusion stress threshold to the occurrence of the abnormal phenomenon.

[0026] Optionally, monitor whether any abnormal phenomena occur in the battery under test during the cell displacement process and the simulated impact deformation test;

[0027] When an abnormal phenomenon is detected, the test is stopped and the target cell is restored to its original position. The abnormal phenomenon includes electrical sparks, arcs, leakage of chemical substances in the cell, or visible deformation inside or outside the battery under test.

[0028] Furthermore, to achieve the above objectives, the present invention provides a battery internal safety testing device, the battery internal safety testing device comprising:

[0029] The cell orientation movement module is used to control the cell lifting device to move the target cell toward the upper casing of the battery under test, and to acquire safety performance data during the displacement of the target cell.

[0030] The battery data processing module is used to obtain the safety performance evaluation result of the battery under test based on the safety performance data.

[0031] Furthermore, to achieve the above objectives, the present invention provides a battery internal safety testing device, the battery internal safety testing device comprising: a memory, a processor, and a battery internal safety testing program stored in the memory and executable on the processor, the battery internal safety testing program being configured to implement the steps of the battery internal safety testing method.

[0032] Furthermore, to achieve the above objectives, the present invention provides a storage medium storing a battery internal safety test program, wherein the battery internal safety test program, when executed by a processor, implements the steps of the battery internal safety test method.

[0033] This invention first identifies the simulated impact location. An externally mounted cell lifting device controls the spatial position of the cells in this localized area, simulating the contact and compression between the cells and the casing during a vehicle impact. During cell displacement, key indicators such as internal battery temperature, voltage, and abnormal noises are monitored in real time to detect any anomalies. If no anomalies occur during the cell's position change until contact with the casing, further compressive stress is applied to simulate impact deformation until a preset test value is reached. By observing whether and when any anomalies occur during the cell's rise and compression, the battery's safety performance can be determined. In summary, by simulating cell displacement and compression caused by an impact, combined with real-time monitoring and data analysis, the safety performance of a battery under extreme scenarios can be effectively evaluated. Attached Figure Description

[0034] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a flowchart illustrating the first embodiment of the battery internal safety testing method of this application;

[0037] Figure 2 This is a first schematic diagram of the test apparatus for the first embodiment of the battery internal safety test method of this application;

[0038] Figure 3 This is a second schematic diagram of the test apparatus for the first embodiment of the battery internal safety test method of this application;

[0039] Figure 4 This is a flowchart illustrating the second embodiment of the battery internal safety testing method of this application;

[0040] Figure 5 This is a schematic diagram of the functional modules of the battery internal safety testing device of this application;

[0041] Figure 6 This is a schematic diagram of the structure of the terminal device in the hardware operating environment involved in the embodiments of this application.

[0042] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0043] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0044] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0045] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device or battery internal safety testing device capable of performing the above functions. The following description uses a battery internal safety testing device as an example to illustrate this embodiment and the subsequent embodiments.

[0046] This application provides a battery internal safety testing method, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of this application.

[0047] In this embodiment, the battery internal safety testing method includes:

[0048] Step S10: Control the cell lifting device to move the target cell toward the upper casing of the battery under test.

[0049] It should be noted that the cell lifting device is a mechanical device used to control the position of the cells inside the battery. In battery safety testing, this device is used to simulate the displacement or deformation of the internal cells when the battery is subjected to external impact or pressure. Specifically, since the failure of the cells during an impact originates from the lateral displacement or mutual compression of the cells in the horizontal direction, and since such accidents involve a series of cells being compressed, the test will show interactions between multiple cells, which is not conducive to experiments with controlled variables. Therefore, this application mainly tests the safety performance of the cells inside the battery pack when they are displaced and compressed in the vertical direction when the vehicle is impacted.

[0050] Reference Figure 2 , Figure 2 This is a first schematic diagram of the test apparatus for the first embodiment of the battery internal safety test method of this application.

[0051] Understandably, before testing, the complete battery under test consists of an upper and lower casing of the battery pack, with a cell array in the middle. The cells are arranged in parallel, and the cell terminals generally correspond to the upper casing. Before actual testing, it is necessary to determine the cell corresponding to the impact location based on the simulated impact location as the target cell for testing. Then, the lower casing portion corresponding to the target cell is removed and replaced with a cell lifting device. The lifting device drives the target cell to move in a directional manner, which can simulate the displacement that the cell may undergo under conditions such as vehicle collisions. This allows testing the safety performance of the battery pack's internal structure under such impacts. In addition to changes in spatial position, the cell lifting device can also apply additional compressive stress when the target cell comes into contact with the casing, thereby simulating the deformation of the battery under pressure.

[0052] In one embodiment, before the cell lifting device moves the target cell toward the upper casing of the battery under test, the method further includes: determining the target cell in the cell array based on the simulated impact location in the test task; replacing the lower casing of the target cell with the cell lifting device to control the spatial position of the target cell; and after the internal electrical environment of the battery under test reaches a stable state, performing the step of controlling the cell lifting device to move the target cell toward the upper casing of the battery under test.

[0053] It is understandable that, due to the differences in battery models and construction, the internal cell arrangement of various batteries also differs. For example, Figure 2 The battery cells are arranged in a pattern similar to piano keys. (See also...) Figure 3 , Figure 3 This is another type of battery with a different cell arrangement. Currently, the most common cell shape on the market is cylindrical, especially the 18650 cell, which is widely used in the small-power market, such as electric bicycles / motorcycles, electric forklifts / AGVs. When cylindrical cells are used as battery cells in vehicles, they are mostly arranged as follows... Figure 3 The central mesh arrangement forms a complete cell array. Corresponding to different cell arrangement patterns, the cell lifting device also rearranges and combines multiple sub-lifting platforms according to the cell arrangement, forming a structure like... Figure 3 The second schematic diagram of the test device is shown.

[0054] It should be understood that the logic for controlling the movement of the battery cells inside the battery in this test needs to be stated here. The essence of controlling the movement of the battery cells is to test the battery cell's position change. The terminals in the battery cell, as positive and negative electrodes, can form a high potential difference with the surroundings. If the position changes, that is, if the battery cell terminals and the surrounding battery cell terminals or other conductive parts do not cause a safety accident under this high potential difference, it indicates that the safety performance is good. Therefore, the test logic is to reduce the distance between the terminals and the adjacent casing or to make direct contact. Based on whether any abnormal phenomena occur during the movement or even contact process, as well as the timing and gap distance when abnormal phenomena occur, the safety performance of the battery under impact can be evaluated.

[0055] Step S20: Obtain safety performance data during the displacement of the target cell.

[0056] It should be noted that during the cell's displacement, the distance between the cell terminals and the casing gradually decreases. Due to the high potential difference, when the distance between the cell terminals and the casing decreases to a certain value, the high potential difference may cause air or other media breakdown, forming an arc discharge. Arc discharge leads to a rapid increase in local temperature, which may damage the cell or casing, even triggering thermal runaway, and may also cause micro-short circuits inside the battery. These abnormal phenomena will be reflected in the safety performance data. For example, when an arc or spark occurs inside the battery, the internal temperature will change abnormally, which will be clearly different from the temperature rise during normal battery use. When an electric arc is generated, an abnormal sound will occur as the air breaks down. However, batteries generally do not make noise during normal use. The number of abnormal sounds can be used to determine whether there is an abnormality inside the battery. When a cell leaks current or short-circuits, the current will increase sharply according to Ohm's law due to the sudden decrease in external resistance, causing the cell's supply voltage to drop rapidly. If the leakage or short circuit is not a complete direct circuit, voltage fluctuations or instability may be observed when the cell tries to maintain the voltage level. At the same time, the current tries to find a low-impedance path. Therefore, the change in the supply voltage of the target cell during the cell displacement time can be used to indirectly determine whether abnormal phenomena such as leakage or short circuit have occurred.

[0057] In one embodiment, the process of obtaining safety performance data during the displacement of the target cell includes: obtaining safety performance data in the first round of cell displacement and / or the second round of cell displacement, wherein the safety performance data includes the amount of change in internal battery temperature, the amount of change in the supply voltage of the target cell, and the number of abnormal noises inside the battery.

[0058] Understandably, in a real vehicle collision, the battery cell may not immediately contact the upper casing, but rather gradually approach it as the impact force increases. Staged displacement can better simulate this process. Since the distance between the cell terminals and the casing is controllable, the displacement process can be further divided into stages based on a preset short-circuit test distance. This is used to test whether a short circuit will occur when the gap between the cell terminals and the casing is shortened to that distance. Furthermore, by performing staged displacement, the gap between the cell and the upper casing can be gradually shortened, simulating different degrees of impact from light to heavy. For example, the process of displacing the target cell towards the upper casing of the battery under test can be divided into two stages. In the first stage, the cell and casing remain within the preset short-circuit test distance. This can be used to evaluate the physical and electrical response of the cell when approaching a critical distance without contact between them. If no abnormalities occur in the first round of displacement, it indicates that the battery maintains a safe state under a small degree of deformation; otherwise, it indicates that even a small degree of deformation cannot guarantee the internal safety of the battery.

[0059] In one embodiment, the control cell lifting device moves the target cell toward the upper casing of the battery under test, and acquires safety performance data during the displacement of the target cell. This includes: moving the target cell toward the upper casing of the battery under test in a first round, reducing the gap between the cell terminal of the target cell and the upper casing to a preset short-circuit test distance; if no abnormality occurs in the first round of displacement, a second round of displacement is performed, gradually reducing the gap between the cell terminal of the target cell and the upper casing, and stopping the displacement when contact is made with the upper casing.

[0060] It should be understood that if no problems are found after the first round of displacement, the second round of displacement can continue. However, if any abnormality is found in any round during the overall testing process, for safety reasons, the test must be stopped immediately and the target cell must be restored to its original position to avoid further damage to other components inside the battery.

[0061] Step S30: Based on the safety performance data, obtain the safety performance evaluation result of the battery under test.

[0062] It should be noted that for the phased displacement in the aforementioned steps, the safety performance of the battery can be indirectly graded and evaluated based on the timing of the abnormal phenomenon. For example, if all safety performance data are within the safe range during the first phase of displacement, it means that the battery pack can be kept safe within the displacement distance of this phase caused by the collision. Furthermore, if one or more safety performance data fail to meet the preset safety performance indicators during a certain phase of displacement, the overall safety of the battery can be determined based on the displacement distance of this phase. For example, if an abnormal phenomenon occurs within the first phase of displacement, the greater the displacement distance of the cell, the stronger the impact resistance of the battery. Generally, an abnormal phenomenon only occurs when the displacement distance is deep enough, indicating that the battery pack has high safety under impact.

[0063] In one embodiment, obtaining the safety performance evaluation result of the battery under test based on the safety performance data includes: if one or more of the safety performance data fail to meet the preset safety performance index during the first round of cell displacement, the safety level of the battery under test is determined to be insufficient; if one or more of the safety performance data fail to meet the preset safety performance index during the second round of cell displacement, the safety level of the battery under test is determined to be average; if the safety performance data meet the preset safety performance index during both the first and second rounds of cell displacement, the safety level of the battery under test is determined to be good.

[0064] Understandably, if an anomaly occurs before the cell's displacement within the battery pack reaches the short-circuit test distance, it indicates that the current battery pack cannot guarantee internal battery safety even under minor impacts, thus suggesting an insufficient safety level for the battery. Conversely, if an anomaly occurs after the cell's displacement reaches the short-circuit test distance but before contact with the casing, it indicates that the battery can guarantee internal safety at least within a certain range of cell displacement. Furthermore, if no anomalies occur during the contact between the cell's terminals and the casing, it means that no anomalies will occur internally without subsequent impacts causing compression, implying good impact resistance and a good safety level for the current battery. In addition, to ensure the reliability of the evaluation results, the test may need to be repeated multiple times under the same conditions, i.e., multiple tests along the same displacement distance, to reduce the randomness of the obtained evaluation results.

[0065] It should be understood that, in addition to displacement testing of a single cell, it is also possible to conduct displacement testing of multiple cells simultaneously. For example, during a vehicle collision, depending on the battery's position and installation orientation within the vehicle, multiple cells in a specific orientation may be more likely to be compressed and deformed than cells in other locations. Therefore, multiple cells can be selected as a group for testing to simulate the displacement and compression of cells in these specific locations during a collision.

[0066] This embodiment provides a method for testing the internal safety of a battery. This embodiment uses a cell lifting device externally placed in the battery pack to control the positional change of cells in a localized location, simulating the contact and compression between the cells and the casing under vehicle collision conditions. During the cell displacement process, key indicators such as temperature, voltage, and abnormal noise inside the battery are monitored in real time to capture any abnormal phenomena. If no abnormality occurs during the displacement process, compression stress is further applied to simulate the compression caused by the impact until a preset test value is reached. By observing whether any abnormal phenomena occur during the cell's rise and compression process, as well as the timing of such abnormal phenomena, the safety performance of the battery can be determined.

[0067] In summary, this application can accurately simulate the displacement and compression that battery cells may experience during a vehicle collision, providing more realistic test conditions for evaluating battery safety performance. During the test, key indicators inside the battery, including temperature, voltage, and abnormal noises, are monitored in real time, ensuring an immediate understanding of the battery status and a rapid response to any abnormal phenomena. By observing the behavior of the battery cells during displacement and compression, and combining this with safety performance data, the safety performance of the battery can be accurately evaluated based on actual testing.

[0068] Reference Figure 4 , Figure 4 This is a flowchart illustrating the second embodiment of the battery internal safety testing method of this application. Based on the first embodiment described above, a second embodiment of the battery internal safety testing method of this application is proposed.

[0069] In this embodiment, after step S30, the method further includes:

[0070] Step S40: If no abnormal phenomenon occurs during the second round of cell displacement, control the cell lifting device to generate compressive stress between the target cell and the upper shell.

[0071] It should be noted that since compression is a continuation of the impact event, in most cases, if the battery is not directly compressed, the cell inside the battery will only experience a limited impulse. When an impact event causes direct compression of the battery, a continuous compressive force will be generated between the cell and the casing. Depending on the magnitude and duration of this compressive force, the possibility of abnormal phenomena occurring inside the battery under such circumstances needs to be tested in detail, and the battery safety performance should be evaluated based on the test data. This simulation of compressive stress is crucial for understanding the safety performance of batteries in actual impact events.

[0072] Step S50: When the compressive stress rises to the simulated deformation compressive test value, the compressive stress is unloaded after the current compressive stress reaches the preset load duration to complete the simulated impact deformation test.

[0073] Understandably, simulated impact deformation tests are generally divided into two stages. Since there is no compression at the end of the displacement in the aforementioned steps, a compression stress is applied through the cell lifting device. In the first stage, the stress value gradually increases from zero until it reaches a preset test value. Generally, cell manufacturers will mark the safety threshold of the cell model when it is compressed. Under stress not exceeding this range, the cell can still work normally. However, since electrical abnormalities such as short circuits do not conflict with the cell remaining in a normal state (short circuit faults are triggered by external conditions; even if the cell itself is normal, it will short circuit as long as certain external conditions are met), it is necessary to test whether, under certain stress, contact has already occurred, further short circuits or other abnormalities will occur.

[0074] It should be understood that since the stress tested cannot exceed the compressive stress threshold, once the applied stress rises to that threshold, it is equivalent to entering the second stage, which is to maintain the currently applied stress for a period of time to simulate the shell deformation caused by the impact. This deformation will cause the compressive stress to persist for a certain period of time.

[0075] In one embodiment, in the simulated impact deformation test, if the battery under test exhibits an abnormal phenomenon during the rising compressive stress stage, the safety performance data further includes the magnitude of the compressive stress at the time the abnormal phenomenon occurs; if the battery under test exhibits an abnormal phenomenon during the compressive stress load stage, the safety performance data further includes the duration of the compressive stress from the simulated deformation compressive stress threshold to the steady-state load at the time the abnormal phenomenon occurs.

[0076] Understandably, the first stage is the compressive stress escalation stage, and the second stage is the compressive stress loading stage. The first stage aims to assess whether the cell exhibits initial abnormalities under gradually increasing stress, such as localized deformation or micro-cracks on the battery pack's exterior leading to sustained compression of a single cell. If the cell remains stable during this stage without short circuits or other electrical anomalies, it indicates a certain degree of safety under lower levels of deformation. Conversely, if the cell remains stable, it suggests that while it possesses some impact resistance, it may have structural weaknesses or safety risks under lower levels of deformation. Moving to the second stage, the compressive stress loading stage, the stress has reached a preset safety threshold and is maintained at this level for a certain period. The purpose of this stage is to simulate the continuous deformation the battery may experience after an impact, assessing the cell's stability and safety under sustained stress. During this stage, close monitoring of the cell's temperature changes, voltage fluctuations, and any forms of electrical or physical anomalies is necessary. If the cell performs normally during the compressive stress escalation stage but exhibits abnormalities during the loading stage, it indicates a decrease in the cell's structural integrity and safety under sustained stress. Furthermore, the safety performance of the battery under compression can be further evaluated based on the magnitude of the stress or the duration of the stress load when the abnormal phenomenon occurs in the two stages. For example, in the first stage, the greater the compressive stress corresponding to the occurrence of the abnormal phenomenon, the better its safety performance. In the second stage, the longer the compressive stress load duration when the abnormal phenomenon occurs, the better its safety performance. These two data can be used to further accurately evaluate the safety performance of the battery under test.

[0077] It should be noted that abnormal phenomena include, but are not limited to, electrical sparks, arcs, leakage of chemical substances from the battery cell, or visible deformation inside or outside the battery under test. Electrical sparks are usually caused by short circuits inside or outside the battery; when current attempts to flow through an unexpected path, a discharge phenomenon occurs in the air, manifesting as an electrical spark. An arc is a continuous discharge phenomenon, more serious than an electrical spark. An arc is caused by an internal short circuit or poor external contact and can rapidly heat the surrounding environment, potentially igniting the battery or other materials. After being squeezed or impacted, the chemical substances inside the battery cell may leak out, which may cause harm to the environment and human health. Furthermore, since most battery structural components do not possess elastic deformation properties, once deformation occurs, it is irreversible; therefore, testing should be stopped when visible deformation is observed. The occurrence of these abnormal phenomena is crucial for assessing battery safety, as they provide direct evidence that the battery may fail under mechanical stress.

[0078] This embodiment provides a battery internal safety testing method. This embodiment employs a two-stage simulated impact deformation test to evaluate the battery's safety under continuous compression. The first stage is the compression stress escalation stage, where a cell lifting device controls the target cell to contact the upper casing, gradually increasing the stress to a preset safety threshold to detect the cell's stability and safety in the initial stage of deformation. The second stage is the compression stress load stage, in which a preset stress is continuously applied to simulate the battery's continuous pressure after an impact, further evaluating the cell's safety under continuous stress. During the test, the cell's temperature, voltage, and physical state are closely monitored. Any abnormal phenomena such as electrical sparks, arcs, chemical leaks, or deformation are recorded. The battery's safety performance is evaluated based on the load duration or stress magnitude at the time of the abnormal phenomenon.

[0079] In summary, the beneficial effects of this solution lie in providing a systematic battery safety assessment process. By simulating two stages of impact deformation testing, it accurately captures the real-time response and abnormal phenomena of the battery under pressure, thereby effectively assessing and predicting battery safety performance. This method not only enhances the robustness of battery design, ensuring the prevention and control of potential hazards in practical applications, but also provides a scientific basis for continuous improvement of battery safety and the development of industry standards through standardized testing protocols, ultimately increasing user trust in battery products and the overall safety level of the industry.

[0080] Reference Figure 5 This application also provides a battery internal safety testing device, the battery internal safety testing device comprising:

[0081] The cell orientation movement module 10 is used to control the cell lifting device to move the target cell toward the upper casing of the battery under test, and to obtain safety performance data during the displacement of the target cell.

[0082] The battery data processing module 20 is used to obtain the safety performance evaluation result of the battery under test based on the safety performance data.

[0083] In one embodiment, the cell orientation movement module 10 is further configured to determine the target cell in the cell array based on the simulated impact location in the test task; replace the lower casing of the target cell with the cell lifting device to control the spatial position of the target cell; and after the internal electrical environment of the battery under test reaches a stable state, execute the step of controlling the cell lifting device to move the target cell toward the upper casing of the battery under test.

[0084] In one embodiment, the cell orientation movement module 10 is further configured to perform a first round of displacement toward the upper casing of the battery under test, reducing the gap distance between the cell terminal of the target cell and the upper casing to a preset short-circuit test distance; if no abnormality occurs in the first round of displacement, a second round of displacement is performed, gradually reducing the gap distance between the cell terminal of the target cell and the upper casing, and stopping the displacement when contact is made with the upper casing; and acquiring safety performance data in the first round of cell displacement and / or the second round of cell displacement, wherein the safety performance data includes the change in internal battery temperature, the change in the supply voltage of the target cell, and the number of abnormal noises inside the battery.

[0085] In one embodiment, the cell orientation movement module 10 is further configured to control the cell lifting device to generate compressive stress between the target cell and the upper housing if no abnormal phenomenon occurs during the second round of cell displacement; and to unload the compressive stress after maintaining the current compressive stress at the preset load duration when the compressive stress rises to the simulated deformation compressive test value, so as to complete the simulated impact deformation test.

[0086] In one embodiment, the battery data processing module 20 is further configured to: determine that the safety level of the battery under test is insufficient if one or more of the safety performance data fails to meet the preset safety performance index during the first round of cell displacement; determine that the safety level of the battery under test is average if one or more of the safety performance data fails to meet the preset safety performance index during the second round of cell displacement; and determine that the safety level of the battery under test is good if the safety performance data meets the preset safety performance index during both the first and second rounds of cell displacement.

[0087] In one embodiment, the cell orientation movement module 10 is further configured to, in the simulated impact deformation test, if the battery under test exhibits an abnormal phenomenon during the extrusion stress rise stage, the safety performance data also includes the magnitude of the extrusion stress at the time of the abnormal phenomenon; if the battery under test exhibits an abnormal phenomenon during the extrusion stress load stage, the safety performance data also includes the duration of the extrusion stress from the simulated deformation extrusion stress threshold to the steady-state load at the time of the abnormal phenomenon.

[0088] In one embodiment, the battery data processing module 20 is further configured to monitor whether any abnormal phenomena occur in the battery under test during the cell displacement process and simulated impact deformation test; when an abnormal phenomenon is detected, the test is stopped and the target cell is restored to its original position. The abnormal phenomena include electrical sparks, arcs, leakage of chemical substances in the cell, or visible deformation inside or outside the battery under test.

[0089] This application also provides a battery internal safety testing device, the device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the battery internal safety testing method of the above embodiment 1.

[0090] The following is for reference. Figure 6 The diagram illustrates a structural schematic of a battery internal safety testing device suitable for implementing embodiments of this application. The battery internal safety testing device in this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), and in-vehicle terminals (e.g., in-vehicle navigation terminals), as well as fixed terminals such as digital TVs and desktop computers. Figure 5 The battery internal safety testing equipment shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0091] like Figure 6As shown, the battery internal safety testing equipment may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the battery internal safety testing equipment. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. The communication device 1009 allows the battery internal safety testing equipment to communicate wirelessly or wiredly with other devices to exchange data. Although the figure shows battery internal safety testing equipment with various systems, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0092] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0093] The battery internal safety testing equipment provided in this application, employing the battery internal safety testing method described in the above embodiments, solves the technical problem in the art of how to design a testing method and equipment capable of simulating cell displacement and short circuits caused by impacts within a vehicle battery pack, in order to accurately evaluate the impact resistance safety performance of the battery system. Compared with the prior art, the beneficial effects of the battery internal safety testing equipment provided in this application are the same as those of the battery internal safety testing method provided in the above embodiments, and other technical features of this battery internal safety testing equipment are the same as those disclosed in the method of the previous embodiment, and will not be repeated here.

[0094] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0095] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0096] This application also provides a storage medium storing a battery internal safety test program, which, when executed by a processor, implements the steps of the battery internal safety test method described in any one of the above descriptions.

[0097] The storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of storage media may include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0098] The aforementioned storage medium may be included in the battery internal safety testing equipment; or it may exist independently and not be assembled into the battery internal safety testing equipment.

[0099] The aforementioned computer-readable storage medium carries one or more programs. When the aforementioned one or more programs are executed by the battery internal safety testing equipment, the battery internal safety testing equipment: controls the cell lifting device to move the target cell toward the upper casing of the battery under test, acquires safety performance data during the displacement of the target cell, and obtains the safety performance evaluation result of the battery under test based on the safety performance data.

[0100] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0101] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0102] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0103] The storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the above-described battery internal safety testing method. This solves the technical problem of how to design a testing method and device that can simulate cell displacement and short circuits caused by impacts within a vehicle battery pack, in order to accurately evaluate the impact resistance safety performance of the battery system. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the battery internal safety testing method provided in the above embodiments, and will not be repeated here.

[0104] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A method for testing the internal safety of a battery, characterized in that, The battery internal safety testing method includes: The cell lifting device is controlled to move the target cell toward the upper casing of the battery under test, and safety performance data is obtained during the displacement of the target cell. The control cell lifting device moves the target cell toward the upper casing of the battery under test, and acquires safety performance data during the displacement of the target cell, including: The target cell is moved toward the upper casing of the battery under test in the first round, so that the gap between the cell terminal of the target cell and the upper casing is reduced to the preset short-circuit test distance. If no abnormality occurs in the first round of displacement, the second round of displacement is carried out to gradually reduce the gap between the cell terminal of the target cell and the upper shell, and the displacement stops when it comes into contact with the upper shell. Obtain safety performance data from the first round of cell displacement and / or the second round of cell displacement, wherein the safety performance data includes the change in internal battery temperature, the change in target cell supply voltage, and the number of abnormal noises inside the battery; Based on the safety performance data, the safety performance evaluation result of the battery under test is obtained.

2. The battery internal safety testing method according to claim 1, characterized in that, Before the control cell lifting device moves the target cell toward the upper casing of the battery under test, it further includes: The target cells in the cell array are determined based on the simulated impact locations in the test mission. The lower casing of the target battery cell is replaced with the battery cell lifting device to achieve control over the spatial position of the target battery cell; After the internal electrical environment of the battery under test reaches a stable state, the step of controlling the cell lifting device to move the target cell toward the upper casing of the battery under test is executed.

3. The battery internal safety testing method according to claim 1, characterized in that, After stopping the displacement upon contact with the upper housing, the method further includes: If no abnormal phenomena occur during the second round of cell displacement, the cell lifting device is controlled to generate compressive stress between the target cell and the upper shell. When the compressive stress rises to the simulated deformation compressive test value, the compressive stress is unloaded after the current compressive stress reaches the preset load duration to complete the simulated impact deformation test.

4. The battery internal safety testing method according to claim 1, characterized in that, The step of obtaining the safety performance evaluation result of the battery under test based on the safety performance data includes: If one or more of the safety performance data fail to meet the preset safety performance index during the first round of cell displacement, the safety level of the battery under test is deemed insufficient. If one or more of the safety performance data fail to meet the preset safety performance index during the second round of cell displacement, the safety level of the battery under test is judged to be average. If the safety performance data in both the first and second rounds of cell displacement meet the preset safety performance indicators, then the safety level of the battery under test is judged to be good.

5. The battery internal safety testing method according to claim 3, characterized in that, In the simulated impact deformation test, if the battery under test exhibits an abnormal phenomenon during the stage of rising compressive stress, the safety performance data also includes the magnitude of the compressive stress at the time of the abnormal phenomenon. If the battery under test exhibits an abnormal phenomenon during the extrusion stress load stage, the safety performance data also includes the extrusion stress being the steady-state load duration from the simulated deformation extrusion stress threshold to the occurrence of the abnormal phenomenon.

6. The battery internal safety testing method according to any one of claims 1 to 5, characterized in that, The battery internal safety testing method further includes: Monitor whether any abnormal phenomena occur in the battery under test during the cell displacement process and simulated impact deformation test; When an abnormal phenomenon is detected, the test is stopped and the target cell is restored to its original position. The abnormal phenomenon includes electrical sparks, arcs, leakage of chemical substances in the cell, or visible deformation inside or outside the battery under test.

7. A battery internal safety testing device, characterized in that, The battery internal safety testing device includes: The cell orientation movement module is used to control the cell lifting device to move the target cell toward the upper casing of the battery under test, and to acquire safety performance data during the displacement of the target cell. The cell orientation movement module is further configured to perform a first round of displacement towards the upper casing of the battery under test, reducing the gap between the cell terminal of the target cell and the upper casing to a preset short-circuit test distance; if no abnormality occurs in the first round of displacement, a second round of displacement is performed, gradually reducing the gap between the cell terminal of the target cell and the upper casing, and stopping the displacement when contact is made with the upper casing; and acquiring safety performance data from the first round of cell displacement and / or the second round of cell displacement, wherein the safety performance data includes the change in internal battery temperature, the change in the supply voltage of the target cell, and the number of abnormal noises inside the battery; The battery data processing module is used to obtain the safety performance evaluation result of the battery under test based on the safety performance data.

8. A battery internal safety testing device, characterized in that, The battery internal safety testing device includes: a memory, a processor, and a battery internal safety testing program stored in the memory and executable on the processor, wherein the battery internal safety testing program is configured to implement the steps of the battery internal safety testing method as described in any one of claims 1 to 6.

9. A storage medium, characterized in that, The storage medium stores a battery internal safety test program, which, when executed by a processor, implements the steps of the battery internal safety test method as described in any one of claims 1 to 6.

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