Method, system and device for testing single battery and medium

Abstract

The embodiment of the invention provides a method, system and device for testing a battery monomer and a medium, and the method comprises the steps: carrying out the thrust test of an end cover assembly of a test sample, and enabling a test mechanism to apply an acting force to the end cover assembly, the step of enabling the testing mechanism to apply the acting force to the end cover assembly comprises the step of enabling the testing mechanism to intermittently apply the acting force to the end cover assembly; detecting the test sample after the thrust test is finished; and judging whether the test sample passes the thrust test according to the detection result. According to the test method, system and device of the battery monomer and the medium provided by the embodiment of the invention, the acting force is applied to the end cover assembly of the battery monomer for testing, so that the mechanical stress capacity of the end part of the battery monomer can be represented, especially the dynamic stress capacity can be represented, and the comprehensiveness of the detection of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to testing methods, systems, devices and media for battery cells. Background Technology

[0002] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already in widespread use.

[0003] To improve the reliability of batteries, it is necessary to test them, especially their mechanical stress resistance. In related technologies, the testing of the mechanical stress resistance of batteries mainly focuses on the casing of individual battery cells, which is not comprehensive enough and the test methods have poor universality. Summary of the Invention

[0004] In view of this, the embodiments of this application aim to provide a battery cell testing method, system, device and medium that can improve the comprehensiveness and versatility of battery cell mechanical stress testing.

[0005] The first aspect of this application provides a method for testing a battery cell, the method comprising: performing a thrust test on an end cap assembly of a test sample, wherein the thrust test includes applying a force to the end cap assembly by a testing mechanism, and applying a force to the end cap assembly by the testing mechanism includes intermittently applying a force to the end cap assembly by the testing mechanism; detecting the test sample after the thrust test is completed; and determining whether the test sample passes the thrust test based on the detection result.

[0006] In the battery cell testing method of this application embodiment, a force is applied to the end cap assembly of the battery cell for testing. This allows for characterization of the mechanical stress capacity of the battery cell's end, particularly its dynamic stress capacity, thus improving the comprehensiveness of the battery cell testing. Furthermore, the testing method of this application embodiment only requires applying force to the corresponding location, without special requirements on the specific structural form of the battery cell. Therefore, it has good versatility and can be used to test various types of battery cells.

[0007] In some embodiments, the end cap assembly includes an end cap body and an electrode post disposed on the end cap body, and the thrust test on the end cap assembly of the test sample includes applying a thrust test to at least one of the end cap body and the electrode post.

[0008] In some embodiments, performing a thrust test on the pole post includes: performing a first thrust test on the pole post, wherein the first thrust test includes continuously applying a force to the pole post by the test mechanism.

[0009] In this embodiment, a continuous thrust is applied to the pole of the test sample during the first thrust test, thereby enabling the evaluation of the static compressive strength of the pole.

[0010] In some embodiments, the first thrust test includes applying a first predetermined amount of force to the pole continuously for a first predetermined duration using the test mechanism.

[0011] In this embodiment, during the first thrust test, a thrust is applied to the pole at a set duration and a set amount. That is, the influencing factors during the first thrust test are defined as the test duration and the amount of thrust applied. In this way, the static pressure resistance of the pole can be quantitatively characterized, which helps to achieve a relatively standardized evaluation of the static pressure resistance of different types of battery cells.

[0012] In some embodiments, performing a thrust test on the pole post includes performing a second thrust test on the pole post, wherein the second thrust test includes intermittently applying a force to the pole post by the test mechanism.

[0013] In this embodiment, thrust is applied intermittently to the pole during the second thrust test, thereby enabling the dynamic compressibility of the test sample to be evaluated.

[0014] In some embodiments, the second thrust test includes applying a force to the pole at a first predetermined frequency and a first predetermined number of times using the test mechanism.

[0015] In this embodiment, during the second thrust test, a first set number of thrusts are applied to the pole at a first set frequency. That is, the influencing factors during the second thrust test are defined as the thrust application frequency and the number of times. In this way, the dynamic pressure resistance of the pole can be quantitatively characterized, which helps to achieve a relatively standardized evaluation of the dynamic pressure resistance of different types of battery cells.

[0016] In some embodiments, the step of performing a thrust test on the pole post includes at least two test phases each time the thrust test includes applying forces in different directions to the pole post by the test mechanism in different test phases.

[0017] In this embodiment, by applying forces in different directions to the pole during different test stages of the thrust test, it is helpful to more accurately simulate the actual usage environment of the battery cell, thereby further improving the accuracy and comprehensiveness of the test. At the same time, applying forces in different directions during different test stages of a single thrust test also helps to simulate multiple working conditions through a single thrust test, thereby improving test efficiency.

[0018] In some embodiments, the step of performing a thrust test on the pole post includes at least three test phases, wherein in the at least three test phases, the test mechanism applies forces to the pole post along a first direction, a second direction, and a third direction, respectively, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0019] In this embodiment, forces are applied to the pole column in at least three mutually perpendicular directions during thrust testing, which essentially covers all stress patterns experienced by the pole column under various operating conditions. This further improves the accuracy and comprehensiveness of the test results. Furthermore, applying forces along these three directions can be achieved simply by adjusting the relative positional relationship between the testing mechanism and the test sample, or by simply setting up the testing mechanism in these three directions. There are no special requirements for the specific structural form of the testing mechanism and the test sample, making it highly versatile.

[0020] In some embodiments, the end cap assembly includes two poles spaced apart along the first direction, and applying a force along the first direction to the poles by the test mechanism includes applying a force along the first direction to the poles from one side of the poles toward the other pole.

[0021] In this embodiment, a force is applied to the electrode from one side of the electrode in the first direction toward the other electrode. This helps to better simulate the force experienced by the battery cell in actual use and further improves the accuracy of the test.

[0022] In some embodiments, during one test phase of at least one thrust test, the test mechanism applies a force along a fourth direction to the pole post, wherein the pole post is square, the fourth direction is perpendicular to the extension direction of the pole post and intersects any side of the pole post, and / or the end cap body is square, the fourth direction is perpendicular to the extension direction of the pole post and intersects any side of the end cap body.

[0023] This application proposes that for battery cells with a specific usage orientation, that is, for battery cells with square terminals and / or end cap bodies, the force on the terminals during actual use may not be along the long or short side of the terminal and / or end cap body, but may be oblique (for example, some battery cells in battery devices are arranged in a staggered manner, which may cause the terminals to be subjected to oblique forces). Therefore, in this embodiment, a force along a fourth direction is applied to the terminals in one of the test stages, which can better simulate the force on the terminals during actual use and improve the accuracy of the test.

[0024] In some embodiments, applying a force in a fourth direction to the pole post by the testing mechanism includes: applying a force in a first direction and a force in a second direction to the pole post simultaneously, such that the resultant force of the force in the first direction and the force in the second direction points towards the fourth direction, wherein the pole post is square, the first direction and the second direction are both perpendicular to the extension direction of the pole post, and the first direction and the second direction are respectively perpendicular to two adjacent sides of the pole post.

[0025] In this embodiment, the force in the fourth direction is applied by simultaneously applying forces in the first and second directions. Thus, the force in the fourth direction can be applied simply by having two test mechanisms abut against two adjacent surfaces of the pole, without changing the structure of the test mechanisms to apply thrust along the side edge of the pole. This helps to further improve the versatility of the test method.

[0026] In some embodiments, performing a thrust test on the end cap body includes performing a third thrust test on the end cap body, the third thrust test including intermittently applying a force to the end cap body by the test mechanism.

[0027] In this embodiment, a dynamic pressure test is performed on the end cap body, which further improves the comprehensiveness of the test.

[0028] In some embodiments, the third thrust test includes applying a force to the end cap body a second predetermined number of times at a second predetermined frequency using the test mechanism.

[0029] In this embodiment, during the third thrust test, a force is applied to the end cover plate at a second set frequency for a second set number of times. That is, the influencing factors during the third thrust test are defined as the thrust application frequency and the number of times. In this way, the dynamic pressure resistance of the battery cell can be quantitatively characterized, which helps to achieve a relatively standardized evaluation of the dynamic pressure resistance of different types of battery cells.

[0030] In some embodiments, performing a thrust test on the end cap body includes: applying a force along a third direction to the shoulder region of the end cap body by the testing mechanism, wherein the third direction is the extension direction of the pole post.

[0031] In this embodiment, a force is applied to the shoulder region of the end cap body during the third thrust test, which better simulates the forces acting on the end cap body during actual use. Furthermore, in this embodiment, the thrust is applied to the end cap body only along a third direction during the third thrust test, thereby improving testing efficiency.

[0032] In some embodiments, applying a force in a third direction to the shoulder region of the end cap body by means of the test mechanism includes: cutting the shell of one of the test samples into a mold, and applying a force to the shoulder region of the end cap body of another test sample by means of the mold.

[0033] In this embodiment, a mold is formed by cutting the shell of the test sample. In this way, it is possible to apply thrust to the shoulder area of ​​the end cap body without the need for additional mold preparation and / or improvement of the test mechanism structure. Furthermore, the same test mechanism can be used to complete the thrust test on the pole and the end cap body, thereby reducing the test cost and further improving the versatility of the test method.

[0034] In some embodiments, the test sample is a simulated battery cell.

[0035] In this embodiment, the security of the test can be improved.

[0036] In some embodiments, the step of testing the test sample after the thrust test includes: performing an airtightness test on the test sample after the thrust test.

[0037] In this embodiment, air tightness testing is used to determine whether the test sample has passed the thrust test. Compared with other testing methods, air tightness testing can better assess the overall damage of the test sample after the thrust test, thus helping to further improve the accuracy of the test.

[0038] A second aspect of this application provides a battery cell testing system, the testing system comprising: a testing mechanism for applying force to an end cap assembly of a test sample; a detection mechanism for detecting the test sample; and a controller electrically connected to the testing mechanism and the detection mechanism, the controller being used to execute the battery cell testing method described in the first aspect of this application.

[0039] A third aspect of this application provides a testing apparatus for a single battery cell. The testing apparatus includes: a testing module for controlling a testing mechanism to apply a force to an end cap assembly of a test sample to perform a thrust test on the end cap assembly of the test sample, wherein the testing module is specifically used to control the testing mechanism to intermittently apply a force to the end cap assembly; a detection module for controlling a detection mechanism to detect the test sample after the thrust test is completed; and a judgment module for judging whether the test sample passes the thrust test based on the detection result of the detection mechanism.

[0040] A fourth aspect of this application provides a computer-readable storage medium having program instructions stored thereon, which, when executed by a processor, implement the battery cell testing method described in the first aspect of this application.

[0041] The battery cell testing system, apparatus, and medium of this application have all the advantages of the battery cell testing method described in any of the above embodiments, and will not be repeated here. Attached Figure Description

[0042] Figure 1 This is a flowchart of a battery cell testing method according to an embodiment of this application; Figure 2 This is a schematic diagram of the axial structure of the test sample according to the first embodiment of this application; Figure 3 This is a top view of the test sample according to the second embodiment of this application; Figure 4 This is a top view of the test sample according to the third embodiment of this application; Figure 5 This is a top view of the test sample according to the fourth embodiment of this application; Figure 6 This is a schematic diagram of applying forces in different directions to the pole post in one embodiment of this application; Figure 7 This is a schematic diagram of applying forces in different directions to the pole post in another embodiment of this application; Figure 8 This is a schematic diagram of applying a force along a first direction to the pole post in one embodiment of this application; Figure 9 This is a schematic diagram of applying a force along the fourth direction to the pole post in one embodiment of this application; Figure 10 This is a schematic diagram of applying a force to the end cap body in one embodiment of this application; Figure 11 This is a schematic diagram of applying a force to the end cap body in another embodiment of this application; Figure 12 This is a schematic diagram of a battery cell testing system according to an embodiment of this application; Figure 13 This is a schematic diagram of a battery cell testing apparatus according to an embodiment of this application; Figure 14 This is a schematic diagram of a computer-readable storage medium according to an embodiment of this application.

[0043] Explanation of reference numerals in the attached figures 100. Test system; 1. Test sample; 11. Housing; 12. End cap assembly; 121. End cap body; 121a. Shoulder area; 122. Pole post; 2. Test mechanism; 3. Detection mechanism; 4. Controller; 200. Test device; 201. Test module; 202. Detection module; 203. Judgment module; 300. Computer-readable storage medium; 300a. Program instructions; X. Mold. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0045] The specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction. For example, different combinations of specific technical features can form different embodiments and technical solutions. To avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0046] In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate that the objects have the sameness or relationship. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to the orientation under normal use conditions, while "left" and "right" refer to the left and right directions shown in the corresponding diagrams, which may or may not be the left and right directions under normal use conditions.

[0047] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A plurality of" means two or more.

[0048] In the description of this application, the orientations or positional relationships of "first direction," "second direction," "third direction," and "fourth direction" are based on the orientations or positional relationships shown in the accompanying drawings. Specifically, "first direction" is the direction indicated by arrow L1 in the drawings, "second direction" is the direction indicated by arrow L2 in the drawings, "third direction" is the direction indicated by arrow L3 in the drawings, and "fourth direction" is the direction indicated by arrow L4 in the drawings. It should be understood that these orientation terms are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0049] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0050] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0051] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0052] This application provides a method, system, apparatus, and medium for testing battery cells. The battery cells targeted by the testing method, system, apparatus, and medium of this application embodiment will be described first below.

[0053] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0054] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0055] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0056] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0057] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0058] In some implementations, the electrode assembly is a stacked structure.

[0059] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0060] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0061] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0062] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0063] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0064] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0065] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0066] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0067] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0068] In some embodiments, the housing includes an end cap assembly and a housing, the housing having an opening, and the end cap assembly covering the opening. The housing may have one or more openings. The end cap assembly may also have one or more.

[0069] In some embodiments, the end cap assembly includes an end cap body and at least one terminal post electrically connected to a tab. The terminal post can be directly connected to the tab or indirectly connected to the tab via a current collector.

[0070] To improve the reliability of battery devices using individual battery cells, it is necessary to test the mechanical stress capacity of the individual battery cells. In related technologies, the mechanical stress capacity test of individual battery cells is usually focused on the casing, which makes it difficult to comprehensively evaluate the mechanical stress capacity of individual battery cells. Moreover, related technologies usually use specific devices to test the mechanical stress capacity of specific battery cells, and there is no universally applicable test method.

[0071] To address the aforementioned problems, this application proposes a method, system, apparatus, and medium for testing battery cells. The method for testing battery cells according to this application includes: performing a thrust test on the end cap assembly of a test sample, the thrust test comprising applying a force to the end cap assembly using a testing mechanism; inspecting the test sample after the thrust test; and determining whether the test sample passes the thrust test based on the inspection results.

[0072] In the battery cell testing methods, systems, apparatus, and media of this application embodiment, a force is applied to the end cap assembly of the battery cell for testing. This allows for characterization of the mechanical stress capacity of the battery cell's end, improving the comprehensiveness of battery cell testing. Furthermore, the testing method of this application embodiment only requires applying force to the corresponding location, without special requirements on the specific structural form of the battery cell; therefore, it has good versatility and can test various types of battery cells.

[0073] The following will be combined with the appendix Figure 1-14 The present application will now provide a detailed description of the testing methods, systems, apparatus, and media for individual battery cells according to embodiments of this application.

[0074] The embodiments of this application first provide a method for testing a single battery cell. At least some steps in the method for testing a single battery cell can be executed by the controller of the battery cell testing system, or by any suitable control device. Alternatively, at least some steps in the method for testing a single battery cell can be executed manually. This application does not impose any restrictions on this.

[0075] Reference Figure 1 The battery cell testing method of this application includes the following steps.

[0076] Step S101: Perform a thrust test on the end cap assembly of the test sample, wherein the thrust test includes applying a force to the end cap assembly by the test mechanism.

[0077] Step S102: After the thrust test is completed, the test sample is inspected.

[0078] Step S103: Determine whether the test sample passes the thrust test based on the test results.

[0079] In step S101, as an example, the test sample can be a simulated battery cell. Here, a simulated battery cell specifically refers to a battery cell with at least the electrode assembly removed. The simulated battery cell can be a structure obtained by directly removing the electrode assembly of the battery cell, or a structure obtained by removing the battery assembly of the battery cell and filling it with other fillers in situ. The specific type of filler is not limited. A simulated battery cell can also be a structure fabricated in imitation of a battery cell.

[0080] The advantage of using simulated battery cells as test samples is that simulated battery cells do not contain active materials (electrode components), which can avoid accidents caused by deformation of the battery cell's terminals and / or end caps during the test.

[0081] As another example, the battery cells to be tested can also be directly extracted as test samples. The advantage of using battery cells directly as test samples is that the test results are closer to those of real battery cells, thereby improving the accuracy of the test.

[0082] Reference Figures 2-5 The test sample 1 specifically includes a housing 11 and an end cap assembly 12. The end cap assembly 12 includes an end cap body 121 and a pole post 122. One side of the housing 11 (e.g., the side along the height direction) has an opening. The end cap body 121 covers the opening of the housing 11. The end cap body 121 and the housing 11 together form the outer shell of the test sample. The pole post 122 is disposed on the end cap body 121.

[0083] In this embodiment, the specific structural forms of the shell 11, end cap body 121, and pole post 122 of the test sample 1 are not limited. For example, refer to Figure 2 and Figure 3 The shell 11 and the end cap body 121 can be formed together as a prism-shaped structure, such as a square structure, or, refer to Figure 4 and Figure 5 The shell 11 and the end cap body 121 can be jointly formed into a cylindrical structure. (Refer to...) Figure 2 and Figure 5 The pole post 122 can be a prismatic structure, such as a square structure, or, as shown in the reference... Figure 3 and Figure 4 The pole post 122 can be a cylindrical structure. (Refer to...) Figure 2 and Figure 3 Test sample 1 may include two poles 122 spaced apart, or, refer to Figure 4 and Figure 5 Test sample 1 may also consist of only one pole 122.

[0084] It should be noted that, Figures 2-5 The test samples shown are only a few exemplary test samples 1. Since the test method of this application is a thrust test, there are no requirements on the shape of the test sample 1 and its corresponding battery cell. It can test any suitable battery cell provided in the related technologies in the art, and has strong universality.

[0085] The thrust test in step S101 specifically refers to applying a force to the end cap assembly 12 by the test mechanism 2 to test its ability to withstand the force. Here, the thrust applied to the end cap assembly 12 of the test sample 1 can be applied according to a certain pattern or randomly, without limitation. Those skilled in the art can determine the thrust application method in the thrust test process according to actual usage requirements (such as the force form and magnitude that the battery cell may experience in actual use). The relevant sections below will also provide specific options for thrust application methods, without limitation.

[0086] In step S101, the test mechanism 2 can be sent a control command to the test mechanism 2 to apply a force to the end cap assembly 12. Here, the specific structure of the test mechanism 2 is not limited, as long as it can apply a thrust to the end cap assembly 12.

[0087] The thrust test in step S101 can be performed on a group of test samples 1. In other words, the thrust test is performed on multiple test samples 1 within a group simultaneously. This reduces the impact of individual differences in test samples 1 on the test results. As an example, each group can have three or more test samples 1 during the thrust test. Of course, the thrust test can also be performed on a single test sample 1. Those skilled in the art can determine the specific test method according to the actual situation.

[0088] In step S101, performing a thrust test on the end cap assembly 12 of the test sample 1 may include performing a thrust test on at least one of the end cap body 121 and the pole post 122 of the test sample 1.

[0089] In step S101, the thrust test can be performed only on the pole post 122 of test sample 1, or only on the end cap body 121 of test sample 1, or both the pole post 122 and the end cap body 121 of test sample 1 can be subjected to thrust tests. In the embodiment where both the pole post 122 and the end cap body 121 of test sample 1 are subjected to thrust tests, the thrust test can be performed on the pole post 122 of one or a group of test samples 1, and the thrust test can be performed on the end cap body 121 of another or another group of test samples 1. In other words, for a test sample 1, only one of the pole post 122 and the end cap body 121 is subjected to thrust tests. Alternatively, the thrust test can be performed on the pole post 122 and the end cap body 121 of one or a group of test samples 1 separately.

[0090] Furthermore, in step S101, the end cap assembly 12 of the test sample 1 can be subjected to various thrust tests. Here, performing different thrust tests specifically means using different force loading methods to perform thrust tests. Those skilled in the art can understand that different thrust tests can reflect the mechanical force capacity of the test sample 1 under different working conditions, thus further improving the comprehensiveness of the battery cell test.

[0091] Similarly, different thrust tests can be performed on different test samples 1. Taking the two thrust tests on the pole post 122 as an example, one thrust test can be performed on the pole post 122 of one or a group of test samples 1, and another thrust test can be performed on the pole post 122 of another or a different group of test samples 1. Alternatively, different thrust tests can also be performed on the same or the same group of test samples 1, that is, the two thrust tests can be performed on the pole post 122 of one or a group of test samples 1 respectively.

[0092] As mentioned above, in some embodiments, the test sample 1 may include two poles 122. In such embodiments, the thrust test on the poles 122 can be performed on only one pole 122 or on both poles 122 at the same time, without limitation.

[0093] In some embodiments, specifically, only one thrust test is performed for each or each group of test samples 1. In other words, different thrust tests are performed on different or different groups of test samples 1. In this way, the mechanical stress capacity of test samples 1 under different working conditions can be analyzed more accurately.

[0094] It should be noted that those skilled in the art can also perform thrust tests or other forms of tests on other parts of the test sample 1, excluding the end cap assembly 12 (such as the large surface of the housing 11), according to actual usage needs. This application does not impose any restrictions on this.

[0095] Furthermore, in this embodiment, applying a force to the end cap assembly 12 by the testing mechanism 2 includes intermittently applying a force to the end cap assembly 12. Here, intermittently applying a force means that there are times when a force is applied and times when no force is applied during the test. For example, during the test, a force is applied to the end cap assembly 12 once at regular intervals. It can be understood that by intermittently applying a force to the end cap assembly 12, the dynamic pressure on the end cap assembly 12 can be simulated, thereby characterizing the dynamic stress capability of the battery cell.

[0096] Of course, those skilled in the art should understand that in some embodiments, applying force to the end cap assembly 12 by the test mechanism 2 may also include applying force to the end cap assembly 12 continuously by the test mechanism 2.

[0097] In step S102, the test sample 1 is inspected after the thrust test. The specific inspection method used is not limited; as an example, the inspection of the test sample 1 includes, but is not limited to, airtightness testing, deformation testing, crack detection, etc.

[0098] As mentioned above, multiple thrust tests may be performed on the same test sample 1. For example, two thrust tests may be performed on the pole post 122 of the end cap assembly 12, or thrust tests may be performed on the pole post 122 and the end cap body 121 of the end cap assembly 12 separately. In this case, the test can be performed after each thrust test to analyze the mechanical stress capacity of the test sample 1 under various working conditions. Of course, the test can also be performed after all thrust tests are completed to analyze the comprehensive stress capacity of the test sample 1 under different working conditions.

[0099] In step S103, it is determined whether test sample 1 has passed the thrust test based on the test results. The specific criteria for judgment can be determined by those skilled in the art based on actual usage requirements and relevant standards in the field, and there are no restrictions on this.

[0100] In the battery cell testing method of this application embodiment, a force is applied to the end cap assembly 12 of the battery cell for testing. This allows for characterization of the mechanical stress capacity of the battery cell's end, particularly its dynamic stress capacity, thus improving the comprehensiveness of the battery cell testing. Furthermore, the testing method of this application embodiment only requires applying force to the corresponding location, without special requirements on the specific structural form of the battery cell. Therefore, it has good versatility and can be used to test various types of battery cells.

[0101] In some embodiments, as mentioned above, the end cap assembly 12 includes an end cap body 121 and a pole post 122 disposed on the end cap body 121, and performing a thrust test on the end cap assembly 12 includes performing a thrust test on at least one of the end cap body 121 and the pole post 122.

[0102] In this embodiment, a thrust test is performed by applying a force to at least one of the end cap body and the pole post, which helps to improve the accuracy of characterizing the mechanical stress capability of the end cap assembly.

[0103] In some embodiments, the thrust test on the pole post 122 of the test sample 1 in step S101 includes: performing a first thrust test on the pole post 122 of the test sample 1, wherein the first thrust test includes continuously applying a force to the pole post 122 of the test sample 1 by the test mechanism 2.

[0104] Here, "continuously applying force to test sample 1" specifically means that the force is continuously present during the test. It should be noted that continuously applying force does not mean that the force remains constant throughout the test. In this embodiment, the magnitude and / or direction of the force may change during the first thrust test.

[0105] In this embodiment, a force is continuously applied to the pole post 122 during the first thrust test, thereby enabling the evaluation of the static compressive strength of the pole post 122.

[0106] In some embodiments, the first thrust test includes applying a first predetermined amount of force to the terminal post 122 of the test sample 1 continuously for a first predetermined duration. Here, the first predetermined duration and the first predetermined amount can be specifically set by those skilled in the art according to actual usage requirements (e.g., the force conditions of the battery cell during actual use), and there are no limitations on this.

[0107] As an example, the first set duration can be 4-8 hours, such as any value from 4h, 4.5h, 5h, 5.5h, 6h, 6.5h, 7h, 7.5h, 8h, or any value between two of these. The first set quantity can be 800-1200N, such as any value from 800N, 850N, 900N, 950N, 1000N, 1050N, 1100N, 1150N, 1200N, or any value between two of these.

[0108] It should be noted that, in this embodiment, although the test duration and the amount of thrust applied for the first thrust test are limited, there is no limitation on the direction of the applied force. Within the first set time, a force in the same direction can be applied to the pole post 122, or a force in different directions can be applied to the pole post 122 in stages.

[0109] In this embodiment, during the first thrust test, a force is applied to the pole post 122 for a set duration and a set amount. That is, the influencing factors during the first thrust test are defined as the test duration and the amount of thrust applied. In this way, the static pressure resistance of the battery cell can be quantitatively characterized, which helps to achieve a relatively standardized evaluation of the static pressure resistance of different types of battery cells.

[0110] In some embodiments, the thrust test on the pole post 122 of the test sample 1 in step S101 includes: performing a second thrust test on the pole post 122 of the test sample 1, wherein the second thrust test includes applying a force to the pole post 122 intermittently by the test mechanism 2.

[0111] Here, unlike the continuous application of force in the first thrust test, the intermittent application of force to the test sample 1 in the second thrust test means that there are times when force is applied and times when thrust is not applied during the test. For example, during the second thrust test, a force is applied to the pole 122 at regular intervals (this interval can be fixed or variable). Similarly, the second thrust test does not restrict the direction, amount, frequency, number of applications, or duration of each application of force.

[0112] In this embodiment, a force is intermittently applied to the pole post 122 during the second thrust test, thereby enabling the dynamic compressive strength of the test sample 1 to be evaluated.

[0113] In some embodiments, the second thrust test includes applying a force to the pole 122 of the test sample 1 a first predetermined number of times at a first predetermined frequency using the test mechanism 2.

[0114] Here, the specific values ​​of the first set frequency and the first set number of times can be determined by those skilled in the art based on actual usage requirements.

[0115] As an example, the first set frequency can be 0.5-1.5Hz, such as any value among 0.5Hz, 0.8Hz, 1Hz, 1.2Hz, and 1.5Hz, or any value between two of these. The first set number of times can be 80,000-150,000 times, such as any value among 80,000, 90,000, 100,000, 110,000, 120,000, 130,000, 140,000, and 150,000 times, or any value between two of these.

[0116] In this embodiment, the amount of force applied each time during the second thrust test can be a fixed value or not a fixed value.

[0117] The amount of force applied during the second thrust test can be less than the first set amount during the first thrust test. Taking the first set amount as 1000N as an example, the amount of thrust applied during the second thrust test can be 150-400N, such as 150N, 200N, 250N, 300N, 350N, 400N, etc.

[0118] As mentioned above, during the test, forces in different directions can be applied to the pole piece 122 at different test stages. In this embodiment, the amount of force applied in the same direction can be a fixed value (i.e., the amount of force applied in each test stage is fixed), while the amount of force applied in different directions can be the same or different. For example, the amount of force applied in one direction may be 200N, and the amount of force applied in another direction may be 350N. Furthermore, the number of times the thrust is applied in different test stages can be the same or different.

[0119] In this embodiment, during the second thrust test, a force is applied to the pole post 122 at a first set frequency for a first set number of times. That is, the influencing factors during the second thrust test are defined as the force application frequency and the number of times. In this way, the dynamic pressure resistance of the battery cell can be quantitatively characterized, which helps to achieve a relatively standardized evaluation of the dynamic pressure resistance of different types of battery cells.

[0120] It should be noted that step S101 may include the first thrust test and the second thrust test mentioned above. In this embodiment, the first thrust test and the second thrust test may be performed on the same or the same group of test samples 1, or on different or different groups of test samples 1.

[0121] In some embodiments, step S101 may specifically include performing a first thrust test on the pole 122 of the first group of test samples 1 and a second thrust test on the pole 122 of the second group of test samples 1. In this way, by performing two different tests on the poles 122 of the two groups of test samples 1 respectively, the accuracy of each thrust test can be further improved.

[0122] In some embodiments, in the step of performing a thrust test on the pole post 122 of the test sample 1, each thrust test includes at least two test phases, in which the test mechanism 2 applies a force to the pole post 122 in different directions.

[0123] It should be noted that the thrust test here can refer to the first thrust test described above, the second thrust test, or any other thrust test performed on the pole piece 122.

[0124] Taking the first thrust test as an example, the first thrust test can be divided into two or more test stages. In each test stage, the test mechanism 2 continuously applies a first set amount of force to the pole column 122. The direction of the force applied by the test mechanism 2 is different in different test stages. The test duration of each test stage can be the same or different. The total duration of multiple test stages is the first set duration mentioned above.

[0125] Taking the second thrust test as an example, the second thrust test can be divided into two or more test stages. In each test stage, the test mechanism 2 applies a force to the pole column 122 at a first predetermined frequency. The direction of the force applied by the test mechanism 2 to the pole column 122 is different in different test stages. The number of times the thrust is applied in each test stage can be the same or different. The total number of times in multiple test stages is the first predetermined number mentioned above. The amount of thrust applied in each test stage can be the same or different. For example, a certain predetermined amount of force is applied in one or more test stages, and another predetermined amount of force is applied in another one or more test stages.

[0126] In this embodiment, specifically, the relative positional relationship between the test mechanism 2 and the pole post 122 can be changed by sending control commands to the test mechanism 2, thereby applying forces in different directions to the pole post 122. Alternatively, the test mechanism 2 can be set in different directions, and the force applied to the pole post 122 in different directions can be achieved by sending control commands to different test mechanisms 2.

[0127] In this embodiment, there is no limitation on the specific number of test stages or the specific direction of the force applied in each test stage. Those skilled in the art can make reasonable selections based on the possible force direction of the terminal post 122 of the battery cell during actual use.

[0128] Taking the first and second force tests on the pole post 122 as an example, the first and second force tests can each include multiple test stages. The number of test stages for the first and second force tests can be the same or different. Furthermore, the direction of the thrust applied in each test stage can also be the same or different.

[0129] In this embodiment, by applying forces in different directions to the pole post 122 during different test stages of the thrust test, it is helpful to more accurately simulate the actual usage environment of the battery cell, thereby further improving the accuracy and comprehensiveness of the test. At the same time, applying forces in different directions during different test stages of a single thrust test also helps to simulate multiple working conditions through a single thrust test, thereby improving test efficiency.

[0130] It should be noted that in some other embodiments, each thrust test may only apply a force in one direction to the pole post 122, that is, the test is no longer divided into multiple test stages.

[0131] In some embodiments, refer to Figure 6 and Figure 7In the step of performing a thrust test on the pole post 122 of the test sample 1, at least one thrust test includes at least three test stages. In the at least three test stages, the test mechanism 2 applies forces along a first direction, a second direction, and a third direction to the pole post 122 of the test sample 1, respectively. Here, the first direction, the second direction, and the third direction are perpendicular to each other.

[0132] by Figure 6 Taking the test sample 1 with two pole posts 122 shown in the figure as an example, the first direction can be the distribution direction of the two pole posts 122, the third direction is the extension direction of the pole posts 122, and the second direction is the direction perpendicular to both the first direction and the third direction.

[0133] by Figure 7 Taking the test sample 1 with a circular pole post 122 shown as an example, the third direction can be the extension direction of the pole post 122. The first direction and the second direction are both perpendicular to the third direction, and the first direction and the second direction are perpendicular to each other.

[0134] Taking a test sample 1 with a square pole post 122 as an example, the third direction can be the extension direction of the pole post 122, and the first direction and the second direction are parallel to the two vertical sides of the pole post 122, respectively.

[0135] It should be noted that in the embodiment where the third direction is the extension direction of the pole post 122, applying a force along the third direction to the pole post 122 specifically means applying a force along the third direction to the pole post 122 from the side of the pole post 122 away from the end cap body 121 along the third direction.

[0136] In this embodiment, during the thrust test, forces are applied to the pole post 122 in at least three mutually perpendicular directions, which can basically achieve full coverage of the stress modes of the pole post 122 under various working conditions. This further improves the accuracy and comprehensiveness of the test results. Moreover, applying forces to the pole post 122 in the above three directions can be achieved simply by adjusting the relative positional relationship between the test mechanism 2 and the test sample 1, or simply by setting the test mechanism 2 in the above three directions. There are no special requirements on the specific structural form of the test mechanism 2 and the test sample 1, making it highly universal.

[0137] It should be noted that the thrust test may include more test phases, and even in an embodiment where the thrust test includes three test phases, the forces applied in the three test phases may not be in the three directions mentioned above, but in other directions.

[0138] It should also be noted that in some other embodiments, the thrust test may also include only two test phases, particularly when performing a thrust test on a test sample 1 having a circular pole 122 and a cylindrical shell. The specific reason is that, unlike test sample 1 with a square shell and / or test sample 1 with a square pole 122, test sample 1 with a cylindrical pole 122 and a cylindrical shell only has a specific orientation in the third direction during actual use, and no specific orientation in the first and second directions. Therefore, the thrust test can include only two test phases, one of which applies a force to the pole 122 along the third direction, and the other test phase can apply a force to the pole 122 in any direction perpendicular to the third direction.

[0139] Of course, when performing thrust testing on test sample 1, which has a circular pole post 122 and a cylindrical shell, the above three test stages or more test stages may also be included.

[0140] In some embodiments, refer to Figure 8 The test sample 1 includes two pole posts 122 spaced apart along a first direction. Applying a force along the first direction to the pole post 122 by the test mechanism 2 includes applying a force along the first direction to the pole post 122 from one side of the pole post 122 toward the other pole post 122.

[0141] This application proposes that, for a battery cell with two terminals 122, especially for a battery cell with a large distance between the two terminals 122, the force on the side of the terminal 122 facing the other terminal 122 along the first direction during use is usually greater than the force on the side of the terminal 122 away from the other terminal 122. Therefore, in this embodiment, a force along the first direction is applied to the terminal 122 from the side of the terminal 122 facing the other terminal 122. This helps to better simulate the force on this type of battery cell during actual use and further improves the accuracy of the test.

[0142] Of course, in some other embodiments, refer to Figure 6 and Figure 7 Applying a force along the first direction to the pole post 122 can also be done by applying a force along the first direction to the pole post 122 from the side of the pole post 122 away from the other pole post 122.

[0143] In some embodiments, during at least one test phase of a thrust test, the test mechanism 2 applies a force along a fourth direction to the pole post 122, wherein the pole post 122 is square, the fourth direction is perpendicular to the extension direction of the pole post 122 and intersects any side of the pole post 122, and / or, the end cap body 121 is square, the fourth direction is perpendicular to the extension direction of the pole post 122 and intersects any side of the end cap body 121.

[0144] This application proposes that for battery cells with a specific usage orientation, that is, for battery cells with square terminals 122 and / or end cap bodies 121, the force on the terminals 122 during actual use may not be along the long or short side of the terminals 122 and / or end cap bodies 121, but may be oblique (for example, some battery cells in battery devices are misaligned, causing the terminals 122 to be obliquely stressed). Therefore, in this embodiment, a force along a fourth direction is applied to the terminals 122 in one of the test stages, which can better simulate the force on the terminals 122 during actual use and improve the accuracy of the test.

[0145] In this embodiment, the tilt angle of the fourth direction can be specifically determined according to the force direction of the terminal post 122 during actual use of the battery cell, and there is no limitation thereto. As an example, the fourth direction can be approximately along the diagonal direction of the square terminal post 122, or the fourth direction can be approximately along the diagonal direction of the square end cap body 121.

[0146] In some embodiments, refer to Figure 9 The process of applying a force in the fourth direction to the pole post 122 by the testing mechanism 2 includes simultaneously applying a force in the first direction and a force in the second direction to the pole post 122, such that the resultant force of the forces in the first and second directions points in the fourth direction. The pole post 122 is square, and both the first and second directions are perpendicular to the extension direction of the pole post 122, and the first and second directions are respectively perpendicular to two adjacent sides of the pole post 122. Figure 9 For example, the first direction is perpendicular to the long side of the pole post 122, and the second direction is perpendicular to the short side of the pole post 122. In this way, the two test mechanisms 2 can be made to abut against the wide surface (corresponding to the side of the long side) and the narrow surface (corresponding to the side of the short side) of the pole post respectively, so as to apply a thrust to the pole post simultaneously along the first direction and the second direction.

[0147] It is understandable that in the embodiment where the pole post 122 is circular, when it is necessary to apply a slanted (along the fourth direction) thrust to the pole post 122, it is only necessary to adjust the relative position of the test mechanism 2 and the pole post 122. However, in the embodiment where the pole post 122 is square, directly adjusting the relative position of the test mechanism 2 and the pole post 122 may cause the working surface of the test mechanism 2 (the surface that contacts the pole post 122 when the force is applied) to abut against a side edge of the pole post 122, which may result in the thrust not being applied in the desired manner.

[0148] In this embodiment, the force in the fourth direction is applied by simultaneously applying forces in the first and second directions. Thus, the force in the fourth direction can be applied simply by having two test mechanisms 2 abut against two adjacent surfaces of the pole post 122, without changing the structure of the test mechanism 2 to apply forces along the side edge of the pole post 122. This helps to further improve the versatility of the test method.

[0149] Of course, those skilled in the art will understand that in some other embodiments, the test mechanism 2 may be fixed in the first direction, the second direction, and the third direction (that is, the direction perpendicular to the extension direction of the pole post 122) and the test sample 1 may also be fixed. Therefore, the relative position between the test mechanism 2 and the test sample 1 may not be able to be adjusted at will. In this embodiment, whether it is a circular pole post 122 or a square pole post 122, the force along the fourth direction can be applied by simultaneously applying the force along the first direction and the second direction.

[0150] It should be noted that in an embodiment in which a force is applied to the pole post 122 in the fourth direction during one of the test phases, it is usually not necessary to apply a force in the first and second directions for testing. Therefore, in this embodiment, at least one thrust test may include two test phases, in which a force is applied to the pole post 122 in the third and fourth directions, respectively.

[0151] In some embodiments, during the thrust test of the pole post 122 of the test sample 1, the amount of force applied to the pole post 122 of the test sample 1 varies in different test phases of at least one thrust test.

[0152] In this embodiment, different amounts of force are applied to the test sample 1 in different testing stages. This allows for targeted testing of different intensities based on the different operating conditions of the pole 122, thereby helping to further improve the accuracy of the test.

[0153] Of course, in some other embodiments, the amount of force applied to the pole 122 of the test sample 1 can also be the same in different test phases.

[0154] In some embodiments, performing a thrust test on the end cap body 121 of the test sample 1 includes performing a third thrust test on the end cap body 121 of the test sample 1, wherein the third thrust test includes intermittently applying a force to the end cap body 121 by the test mechanism 2.

[0155] Similarly, applying a thrust to the end cap body 121 of the test sample 1 intermittently here means that there are times when a force is applied and times when no force is applied during the test. For example, during the third thrust test, a force is applied to the end cap body 121 once at regular intervals (the interval can be fixed or variable).

[0156] It should be noted that, in this embodiment, applying force to the end cap body 121 means applying a thrust directly to the end cap body 121, rather than applying a thrust to the end cap body 121 through other structures of the test sample 1 (such as the pole 122).

[0157] It is understood that the end cap body 121 is usually connected to the housing 11 of the battery cell by means such as laser welding, and the connection strength is high. Therefore, the static pressure resistance of the end cap body 121 can usually meet the requirements. In addition, the terminal post 122 itself is fixedly connected to the end cap body 121. Therefore, the test results of the static thrust test on the terminal post 122 can also reflect the static pressure resistance of the end cap body 121 to a certain extent. Therefore, in this embodiment, dynamic pressure test is performed on the end cap body 121, which can further improve the comprehensiveness of the test.

[0158] Of course, in some other embodiments, the thrust test may not be performed on the end cap body 121, but only on the pole post 122. In some other embodiments, a static thrust test may also be performed on the end cap body 121.

[0159] In some embodiments, step S101 specifically includes: performing a first thrust test on the pole post 122 of the first group of test samples 1, performing a second thrust test on the pole post 122 of the second group of test samples 1, and performing a third thrust test on the end cap body 121 of the third group of test samples 1.

[0160] In this embodiment, the above three types of thrust tests are performed on the three groups of test samples 1 respectively, which helps to maximize the comprehensiveness and accuracy of the detection of battery cells.

[0161] In some embodiments, the third thrust test includes applying a force, the test mechanism 2, to the end cap body 121 of the test sample 1 a second predetermined number of times at a second predetermined frequency.

[0162] In the third thrust test, the amount of force applied each time can be a fixed value or not, and there is no restriction on this.

[0163] As mentioned above, in the second thrust test, a first set number of forces are applied to the pole post 122 of the test sample 1 at a first set frequency. In this embodiment, the second set frequency may be the same as or different from the first set frequency, and the second set number of times may be the same as or different from the first set number of times.

[0164] In this embodiment, during the third thrust test, a second set number of forces are applied to the end cover body 121 at a second set frequency. That is, the influencing factors during the third thrust test include the thrust application frequency and the number of times. In this way, the dynamic pressure resistance of the battery cell can be quantitatively characterized, which helps to achieve a relatively standardized evaluation of the dynamic pressure resistance of different types of battery cells.

[0165] In some embodiments, the third thrust test includes causing the test mechanism 2 to apply a force to the end cap body 121 of the test sample 1 a second predetermined number of times at a second predetermined frequency, wherein a second predetermined amount of force is applied each time.

[0166] In this embodiment, it is further clarified that the influencing factors in the third thrust test also include the amount of force applied, which can further improve the standardization of the evaluation.

[0167] In some embodiments, refer to Figure 10 and Figure 11 The thrust test on the end cap body 121 of the test sample 1 includes: applying a force along a third direction to the shoulder region 121a of the end cap body 121 of the test sample 1, where the third direction is the extension direction of the pole post 122 of the test sample 1.

[0168] Reference Figure 2 and Figure 3 In an embodiment where test sample 1 includes two pole posts 122 distributed along a first direction, the region between the edges of the two pole posts 122 and the edge of the end cap body 121 along the first direction is formed as two shoulder regions 121a. (Refer to...) Figure 4 and Figure 5 In an embodiment where test sample 1 includes a pole post 122, the area between the outer periphery of the pole post 122 and the outer periphery of the end cap body 121 is formed as a shoulder region 121a.

[0169] Here, applying a force along a third direction to the shoulder region 121a of the end cap body 121 of the test sample 1 specifically means applying a force along a third direction to the shoulder region 121a of the end cap body 121 of the test sample 1 from the side of the end cap body 121 away from the housing 11 along a third direction.

[0170] It should be noted that in this embodiment, a thrust can be applied to the entire shoulder region 121a of the test sample 1 (for example, in an embodiment where the test sample 1 includes two poles 122, a thrust can be applied to both shoulder regions 121a on both sides of the two poles 122), or a thrust can be applied to only a portion of the shoulder region 121a (for example, in an embodiment where the test sample 1 includes one pole 122, a thrust can be applied to two sub-regions of the shoulder region 121a located on opposite sides of the pole 122).

[0171] It is understood that the shoulder region 121a of the end cap body 121 is the main stress-bearing area of ​​the end cap body 121. Therefore, in this embodiment, a thrust is applied to the shoulder region 121a of the end cap body 121 in the third thrust test, so as to better simulate the stress on the end cap body 121 in actual use.

[0172] Furthermore, it can be understood that since the end cap body 121 is usually embedded in the housing 11 of the battery cell, the shoulder area 121a of the end cap body 121 is mainly subjected to a third force direction during actual use. Therefore, in this embodiment, only a third force is applied to the end cap body 121 in the third thrust test, thereby improving the test efficiency.

[0173] Of course, in some other embodiments, the thrust test on the end cap body 121 may also include multiple test phases, with different test phases applying forces to the end cap body 121 in different directions (e.g., applying a downward force to the end cap body 121 in some test phases).

[0174] In some embodiments, refer to Figure 10 and Figure 11 Applying a thrust to the shoulder region 121a of the end cap body 121 of the test sample 1 includes: cutting the shell of one test sample 1 to form a mold X, and applying a thrust to the shoulder region 121a of the end cap body 121 of another test sample 1 by means of the mold X.

[0175] As an example, refer to Figure 10 and Figure 11The end cap body 121 of the test sample 1 and a portion of the housing 11 near the end cap body 121 can be cut from the outer shell to form a mold X. Thus, when the mold X is placed on the side of another test sample 1 along a third direction, it can better abut against the shoulder region 121a of the end cap body 121 of the test sample 1. By applying a pushing force to the mold X with the help of the test mechanism 2, a pushing force can be applied to the shoulder region 121a of the end cap body 121 of the test sample 1.

[0176] In this embodiment, the mold X is formed by cutting the shell of the test sample 1. Thus, without the need to prepare an additional mold and / or improve the structure of the test mechanism 2, it is possible to apply a thrust to the shoulder region 121a of the end cap body 121 of the test sample 1. Furthermore, the same test mechanism 2 can be used to complete the thrust test on the pole post 122 and the end cap body 121, thereby reducing the test cost and further improving the versatility of the test method.

[0177] Of course, in some other embodiments, the thrust can also be applied to the shoulder region 121a of the end cap body 121 of the test sample 1 by adjusting the structure of the test mechanism 2 and / or the relative position of the test mechanism 2 and the test sample 1.

[0178] In some embodiments, specifically, test sample 1 is a simulated battery cell. As mentioned above, the active material has been removed from the simulated battery cell, which improves the safety of the test.

[0179] In some embodiments, specifically, step S103, which involves testing the test sample 1 after the thrust test, specifically includes: performing an airtightness test on the test sample 1 after the thrust test.

[0180] Here, no restrictions are placed on the specific methods for airtightness testing, or on the specific methods for determining whether the thrust test is passed based on the airtightness test results.

[0181] As an example, the airtightness of test sample 1 can be tested using methods such as differential pressure method, water detection method (bubbling method), and helium mass spectrometry leak detection method, which are well known to those skilled in the art.

[0182] In this embodiment, air tightness testing is used to determine whether test sample 1 has passed the thrust test. Compared with other testing methods, air tightness testing can better assess the overall damage of test sample 1 after the thrust test, thus helping to further improve the accuracy of the test.

[0183] The following will provide a more detailed and specific description of the testing methods for individual battery cells mentioned above, using several specific examples.

[0184] Example 1 The test method of Example 1 is applicable to various types of battery cells, including but not limited to: prismatic battery cells with two square terminals 122, prismatic battery cells with two round terminals 122, cylindrical battery cells with one square terminal 122, and cylindrical battery cells with one round terminal 122.

[0185] First, take three sets of test samples 1. Here, test sample 1 is a simulated battery cell, specifically a battery cell without the motor assembly. The number of test samples 1 in each set is not limited; for example, there can be three.

[0186] Then, a first thrust test was performed on the pole post 122 of the first group of test samples 1, a second thrust test was performed on the pole post 122 of the second group of test samples 1, and a third thrust test was performed on the end cap body 121 of the third group of test samples 1.

[0187] Finally, after the thrust test, the airtightness of each group of test samples 1 was tested, and the results of the airtightness test were used to determine whether each group of test samples 1 passed the corresponding thrust test.

[0188] The first thrust test includes three test phases. In each phase, the test mechanism 2 applies forces to the pole post 122 along a first direction, a second direction, and a third direction, respectively. The applied force in each phase is a first preset value, and the total duration of the three phases is the first preset duration. Each phase has the same duration. For example, the first preset duration is 6 hours, and the first preset value is 1000 N. That is, in each of the three phases, a force of 1000 N is applied to the pole post 122 along the first, second, and third directions, respectively, and each phase lasts for 2 hours.

[0189] Here, the first direction, the second direction, and the third direction are perpendicular to each other, and the third direction is the extension direction of pole column 122.

[0190] The second thrust test includes three test phases. In the three test phases, the test mechanism 2 intermittently applies forces along the first direction, the second direction, and the third direction to the pole column 122. The total number of times the force is applied in the three test phases is the first set number of times, and the frequency of the applied force is the first set frequency. The amount of force applied when applying the force along the third direction is less than the amount of force applied when applying the force along the first direction and the second direction.

[0191] As an example, the first set frequency is 1Hz, the first set number of times is 120,000, and the three test phases are as follows: applying a force to the pole piece 122 40,000 times along the first direction at a frequency of 1Hz, with each application amount of 350N; applying a force to the pole piece 122 40,000 times along the second direction at a frequency of 1Hz, with each application amount of 350N; and applying a force to the pole piece 122 40,000 times along the third direction at a frequency of 1Hz, with each application amount of 200N.

[0192] During the first thrust test and the second thrust test, regardless of whether the test sample 1 has one pole post 122 or two pole posts 122, only one pole post 122 is subjected to thrust.

[0193] In the third thrust test, a third-direction force is applied to the shoulder region 121a of the end cap body 121 at a second set frequency, and the amount applied each time is the second set amount.

[0194] As an example, the second set frequency is 1Hz, the second set number of times is 40,000, and the second set amount is 900N.

[0195] Example 2 The test method of Example 2 is applicable to a battery cell having two pole posts 122 distributed along a first direction.

[0196] The difference from the test method in Embodiment 1 is that in Embodiment 2, during the test phase of applying a force along the first direction in the first thrust test and / or the second thrust test, the test mechanism 2 applies a force along the first direction from the pole post 122 toward one side of the other pole post 122.

[0197] Example 3 The test method of Example 3 is applicable to battery cells having a square end cap body 121 and / or a square terminal post 122.

[0198] The difference between the test method in Embodiment 1 and that in Embodiment 3, the first thrust test and / or the second thrust test include two test phases. In each test phase, forces are applied to the pole post 122 along a third direction and a fourth direction, respectively. The third direction is the extension direction of the pole post 122. The first and second directions are parallel to the two vertical sides of the square pole post 122 and / or the square end cap body 121, respectively. The fourth direction is perpendicular to the third direction and intersects both the first and second directions; in other words, the fourth direction is perpendicular to the third direction and intersects any side of the pole post 122 and / or the end cap body 121.

[0199] As an example, in the first thrust test, the duration of the test phase in which the force is applied along the fourth direction is longer than the duration in which the force is applied along the third direction. For example, the duration in which the force is applied along the fourth direction is 4 hours, and the duration in which the force is applied along the third direction is 2 hours.

[0200] In the second thrust test, the number of times the force is applied along the fourth direction is greater than the number of times the force is applied along the third direction. For example, the number of times the force is applied along the fourth direction is 80,000, and the number of times the force is applied along the third direction is 40,000.

[0201] Applying a force in the fourth direction can specifically include: simultaneously applying a force in the first direction and a force in the second direction to the pole post 122 by the testing mechanism 2, so that the resultant force of the force in the first direction and the force in the second direction points in the fourth direction.

[0202] Embodiments of this application also provide a battery cell testing system 100, referring to... Figure 12 The battery cell testing system 100 includes a testing mechanism 2, a detection mechanism 3, and a controller 4. The testing mechanism 2 is used to apply force to the end cap assembly 12 of the test sample 1. The detection mechanism 3 is used to detect the test sample 1. The controller 4 is electrically connected to the testing mechanism 2 and the detection mechanism 3. The controller 4 is used to execute the battery cell testing method described in any of the above embodiments.

[0203] Here, the specific structural form of the testing mechanism 2 and the detection mechanism 3 is not limited, as long as they can achieve the relevant functions. Those skilled in the art can refer to the relevant technologies in this field to make specific settings.

[0204] The battery cell testing system 100 of this application embodiment has all the advantages of the battery cell testing method described in any of the above embodiments, and will not be repeated here.

[0205] Embodiments of this application also provide a testing apparatus 200 for a single battery cell, see reference. Figure 13 The testing device 200 includes a testing module 201, a detection module 202, and a judgment module 203. The testing module 201 is used to control the testing mechanism 2 to apply a force to the end cap assembly 12 of the test sample 1 to perform a thrust test on the end cap assembly 12 of the test sample 1. The detection module 202 is used to control the detection mechanism 3 to detect the test sample 1 after the thrust test is completed. The judgment module 203 is used to determine whether the test sample 1 passes the thrust test based on the detection result of the detection mechanism 3.

[0206] It should be noted that the information interaction and execution process between the modules of the above-mentioned testing device 200 are based on the same concept as the method embodiment of this application. It is a device corresponding to the above-mentioned battery cell testing method. All implementation methods in the above-mentioned method embodiment are applicable to the embodiment of this device. For its specific functions and the technical effects it brings, please refer to the method embodiment section, which will not be repeated here.

[0207] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0208] The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0209] Embodiments of this application also provide an electronic device, which includes a processor and a memory storing computer program instructions. When the processor executes the computer program instructions, it implements the steps in the battery cell testing method described in any of the above method embodiments.

[0210] The hardware components of this computer device include a processor, a communication interface, and memory. The processor typically controls the overall operation of the computer device. The communication interface enables the computer device to communicate with other terminals or servers via a network. The memory is configured to store instructions and applications executable by the processor, and can also cache data to be processed or already processed by the processor and various modules within the computer device (e.g., image data, audio data, voice communication data, and video communication data). This can be implemented using flash memory or random access memory (RAM). Data transfer between the processor, communication interface, and memory can be performed via a bus.

[0211] Embodiments of this application also provide a computer-readable storage medium 300, see reference to Figure 14The computer-readable storage medium 300 stores computer program instructions 300a, which, when executed by a processor, implement the steps in the battery cell testing method described in any of the above embodiments.

[0212] The computer-readable storage medium 300 can be transient or non-transient.

[0213] Embodiments of this application also provide a computer program product, which includes a computer program or instructions that are executed by a processor to implement the steps in the battery cell testing method described in any of the above embodiments.

[0214] The computer program product can be implemented in hardware, software, or a combination thereof. In some embodiments, the computer program product is specifically embodied in a computer storage medium; in other embodiments, the computer program product is specifically embodied in a software product, such as a software development kit (SDK), etc.

[0215] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of this application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A method for testing a single battery cell, characterized in that, The testing methods for the individual battery cells include: A thrust test is performed on the end cap assembly of the test sample, wherein the thrust test includes applying a force to the end cap assembly by a test mechanism, and applying a force to the end cap assembly by the test mechanism includes applying a force to the end cap assembly intermittently by the test mechanism. The test sample was inspected after the thrust test was completed; The test sample is judged to pass the thrust test based on the test results.

2. The test method according to claim 1, characterized in that, The end cap assembly includes an end cap body and an electrode post disposed on the end cap body. The thrust test on the end cap assembly of the test sample includes performing a thrust test on at least one of the end cap body and the electrode post.

3. The test method according to claim 2, characterized in that, The thrust test of the pole column includes: A first thrust test is performed on the pole post, the first thrust test comprising continuously applying a force to the pole post by the test mechanism.

4. The test method according to claim 3, characterized in that, The first thrust test includes applying a first predetermined amount of force to the pole continuously for a first predetermined duration using the test mechanism.

5. The test method according to claim 2, characterized in that, The thrust test of the pole column includes: A second thrust test is performed on the pole post, the second thrust test comprising intermittently applying a force to the pole post by the test mechanism.

6. The test method according to claim 5, characterized in that, The second thrust test includes applying a force to the pole at a first set frequency and a first set number of times using the test mechanism.

7. The test method according to any one of claims 2-6, characterized in that, In the step of performing a thrust test on the pole post, each thrust test includes at least two test phases, and the thrust test includes applying forces in different directions to the pole post by the test mechanism in different test phases.

8. The test method according to claim 7, characterized in that, In the step of performing a thrust test on the pole post, at least one thrust test includes at least three test stages. In the at least three test stages, the test mechanism applies forces to the pole post along a first direction, a second direction, and a third direction, respectively. The first direction, the second direction, and the third direction are perpendicular to each other.

9. The test method according to claim 8, characterized in that, The end cap assembly includes two pole posts spaced apart along the first direction, and the test mechanism applies a force along the first direction to the pole posts, including: The testing mechanism applies a force along the first direction to the pole from one side of the pole toward the other pole.

10. The test method according to claim 7, characterized in that, In at least one test phase of a thrust test, the test mechanism applies a force along a fourth direction to the pole, wherein, The pole post is square, the fourth direction is perpendicular to the extension direction of the pole post and intersects any side of the pole post, and / or the end cap body is square, the fourth direction is perpendicular to the extension direction of the pole post and intersects any side of the end cap body.

11. The test method according to claim 7, characterized in that, The step of applying a force along the fourth direction to the pole by the testing mechanism includes: The testing mechanism simultaneously applies a force along a first direction and a force along a second direction to the pole, so that the resultant force of the force along the first direction and the force along the second direction points towards the fourth direction. The pole post is square, and both the first direction and the second direction are perpendicular to the extension direction of the pole post, and the first direction and the second direction are respectively perpendicular to two adjacent sides of the pole post.

12. The test method according to any one of claims 2-6 and 8-11, characterized in that, The thrust test on the end cap body includes: A third thrust test is performed on the end cap body, the third thrust test comprising intermittently applying a force to the end cap body by the test mechanism.

13. The test method according to claim 12, characterized in that, The third thrust test includes applying a force to the end cap body at a second predetermined frequency and a second predetermined number of times using the test mechanism.

14. The test method according to claim 2, characterized in that, The thrust test on the end cap body includes: The testing mechanism applies a force along a third direction to the shoulder region of the end cap body, where the third direction is the extension direction of the pole post.

15. The test method according to claim 14, characterized in that, The process of applying a force along a third direction to the shoulder region of the end cap body using the testing mechanism includes: The outer shell of one of the test samples is cut to form a mold, and the testing mechanism applies a force to the shoulder area of ​​the end cap body of another test sample by means of the mold.

16. The test method according to claim 1, characterized in that, The test sample is a simulated battery cell.

17. The test method according to claim 1, characterized in that, The step of testing the test sample after the thrust test includes: After the thrust test is completed, the airtightness of the test sample is tested.

18. A testing system for a single battery cell, characterized in that, The testing system includes: A testing mechanism used to apply force to the end cap assembly of a test sample; A testing organization, used to test the test samples, and A controller, electrically connected to the testing mechanism and the detection mechanism, is used to execute the testing method for a single battery cell according to any one of claims 1-16.

19. A testing device for a single battery cell, characterized in that, The testing apparatus includes: A testing module is used to control the testing mechanism to apply a force to the end cap assembly of the test sample in order to perform a thrust test on the end cap assembly of the test sample. Specifically, the testing module is used to control the testing mechanism to intermittently apply a force to the end cap assembly. The detection module is used to control the detection mechanism to detect the test sample after the thrust test is completed; and The judgment module is used to determine whether the test sample passes the thrust test based on the test results of the testing organization.

20. A computer-readable storage medium, characterized in that, It stores program instructions, which, when executed by a processor, implement the testing method for a single battery cell as described in any one of claims 1-17.

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