Battery test tray, battery test device, and battery production system
Patent Information
- Application Number
- CN202521765839.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-19
- Publication Date
- 2026-09-08
- Estimated Expiration
- 2035-08-19
AI Technical Summary
但电池测K过程中存在局部短路和电池自放电现象，降低了电池的循环寿命和可靠性
[0039] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.
Smart Images
Figure CN224731981U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery testing technology, and in particular to a battery testing tray, a battery testing device, and a battery production system. Background Technology
[0002] The statements herein are provided only as background information in connection with this application and do not necessarily constitute prior art.
[0003] Currently, the K-value test is a crucial part of battery performance testing. "Battery K-value test" refers to measuring the battery's self-discharge rate, which reflects the rate at which the battery's voltage decreases over time when at rest, typically expressed in mV / d. However, the K-value test process is susceptible to partial short circuits and battery self-discharge, reducing the battery's cycle life and reliability. Utility Model Content
[0004] In view of the problems, this application provides a battery test tray, a battery test device, and a battery production system, which can alleviate the problems of partial short circuits and battery self-discharge during battery testing, which reduce the cycle life and reliability of the battery.
[0005] In a first aspect, this application provides a battery test tray, comprising:
[0006] The tray body is used to hold the individual battery cells to be tested;
[0007] The magnetic field generator is located on the outside of the tray body and is used to provide an electromagnetic field to the battery cell under test.
[0008] And a rotary drive mechanism, connected to the magnetic field generator, for providing the driving force to make the magnetic field generator rotate relative to the tray body.
[0009] The aforementioned battery test tray can support the battery cell under test during K-value testing. At this time, the magnetic field generator rotates under the drive of the rotation drive mechanism, causing the electromagnetic field provided by the magnetic field generator to the battery cell under test to also rotate, thus forming a rotating magnetic field. Because the direction of the magnetic force of the rotating magnetic field is constantly changing, it will disrupt the migration path of metal ions in the cathode material to the anode, causing the metal ions to diffuse on the anode surface, reducing the amount of metal ions deposited at a single point, thereby reducing the possibility of metal ions forming sharp metal puncture points on the anode surface, effectively suppressing local short circuits and battery self-discharge, and improving the cycle life and reliability of the battery cell under test.
[0010] In addition, because the battery test tray of this application is used, there is no need to adjust or change the existing battery manufacturing process, thus reducing manufacturing costs.
[0011] In some embodiments, the magnetic field source is located vertically below the tray body.
[0012] On the one hand, since the tray body is used to support the battery cell under test, the battery cell under test is usually placed on top of the tray body. Placing the magnetic field source directly below the tray body can avoid interfering with the placement of the battery cell under test. On the other hand, compared with placing it on the outer periphery of the tray body, placing it directly below the tray body can make the distance between the magnetic field source and each position of the battery cell under test more uniform, thereby making the electromagnetic field more evenly distributed in each position of the battery cell under test, and the metal ions in the battery cell under test can diffuse and distribute more reliably.
[0013] In some embodiments, the magnetic field source includes multiple magnetic rods, all of which are located on the outside of the tray body.
[0014] This not only simplifies the structure of the magnetic field source, but also ensures that the electromagnetic field generated by the magnetic rod is uniform and stable. Under the action of rotational motion, it is more conducive to the uniform diffusion and distribution of metal ions from various locations in the battery cell under test towards the anode.
[0015] In some embodiments, all the magnetic rods are arranged side by side on one side of the tray body.
[0016] When all the magnetic rods are arranged side by side on one side of the tray body, they can provide a uniform electromagnetic field to the battery cell under test on the tray body. Furthermore, under the action of rotation, it is more conducive to the uniform diffusion and distribution of metal ions from various positions in the battery cell under test towards the anode.
[0017] In some embodiments, all the magnetic rods are arranged side by side along a first direction, and the magnetic field source rotates around the rotation axis, with the first direction being perpendicular to the rotation axis.
[0018] When all the magnetic rods are arranged perpendicular to the rotation axis of the magnetic field source, a uniform electromagnetic field can be formed in the region surrounding the rotation axis, which is more conducive to the uniform diffusion and distribution of metal ions from various locations in the battery cell under test towards the anode.
[0019] In some embodiments, the battery test tray further includes a metal shielding shell surrounding the periphery of the magnetic field generating source.
[0020] By setting up a metal shielding shell around the magnetic field source, the interactive magnetic field can be shielded, reducing the damage to external devices caused by the electromagnetic field generated by the magnetic field source.
[0021] In some embodiments, the rotary drive mechanism includes a rotary motor with a rotation frequency of 5 Hz to 15 Hz.
[0022] When the rotation frequency of the rotating motor is 5 Hz to 15 Hz, the electromagnetic field generated by the magnetic field source can form a high-frequency rotating magnetic field, thereby reliably disrupting the migration path of metal ions in the cathode material to the anode and allowing sufficient disruption time. This improves the reliability of the diffusion distribution of metal ions on the anode surface, effectively suppressing local short circuits and battery self-discharge, and enhancing the cycle life and reliability of the battery cells.
[0023] In some embodiments, the magnetic field strength of the electromagnetic field provided by the magnetic field generating source is not less than 6000 Gauss.
[0024] When the magnetic field strength provided by the magnetic field generator is not less than 6000 Gauss, the magnetic field strength is relatively high. Under the action of rotational motion, it can more reliably disrupt the migration path of metal ions in the cathode material to the anode, so that the metal ions are diffusely distributed on the anode surface, reducing the amount of metal ions deposited at a single point. This reduces the possibility of metal ions forming sharp metal puncture points on the anode surface, effectively suppressing local short circuits and battery self-discharge, and improving the cycle life and reliability of the battery cell.
[0025] In some embodiments, when the battery cell under test is a metal-cased battery cell, the magnetic field strength of the electromagnetic field provided by the magnetic field generating source is no greater than 15,000 Gauss.
[0026] When the battery cell under test is a metal-cased battery cell, if the magnetic field strength provided by the magnetic field generator is too high, the magnetic field generator may magnetically attract the battery cell under test, affecting the distribution of the electromagnetic field and reducing the reliability of the magnetic field generator in disrupting the migration path of metal ions in the cathode material to the anode under rotational motion. Therefore, setting the magnetic field strength provided by the magnetic field generator to no more than 15,000 Gauss can reduce the magnetic attraction of the battery cell under test, improve the reliability of the electromagnetic field distribution, and thus improve the reliability of the magnetic field generator in disrupting the migration path of metal ions in the cathode material to the anode under rotational motion.
[0027] In some embodiments, the tray body has a bottom wall and a limiting unit disposed on the bottom wall. The limiting unit includes a plurality of limiting sidewalls, and all the limiting sidewalls and the bottom wall enclose a receiving cavity for accommodating the battery cell to be tested.
[0028] By using a cavity to house the battery cell under test, the position of the battery cell under test can be effectively defined, reducing damage to the battery cell under test caused by external vibration.
[0029] In some embodiments, the contact method between the limiting sidewall and the battery cell under test is surface contact.
[0030] Since the contact method between the limiting sidewall and the battery cell under test is surface contact, the large contact area makes the limiting of the battery cell under test more stable, and also reduces the damage to the battery cell under test caused by stress concentration.
[0031] In some embodiments, each limiting sidewall includes a first limiting sidewall and a second limiting sidewall, one side of the first limiting sidewall is connected to one side of the second limiting sidewall, and the two are arranged at a 90-degree angle.
[0032] In this way, the first limiting sidewall and the second limiting sidewall and the two adjacent surfaces of the battery cell under test can be used to limit the movement, thereby improving the reliability of the limiting.
[0033] In some embodiments, at least two limiting sidewalls are movable relative to each other to change the volume of the receiving cavity.
[0034] When the outer dimensions of the battery cells under test are different, the volume of the receiving cavity can be changed by adjusting the position of the limiting sidewall, thereby enabling the receiving cavity to adapt to the outer dimensions of the battery cells under test and improving the reliability of the limiting.
[0035] In some embodiments, the tray body includes a plurality of limiting units, all of which are spaced apart from each other on the bottom wall.
[0036] In this way, multiple battery cells to be tested can be positioned on the tray body by multiple limiting units, and the limiting units can also be modularized, which facilitates subsequent disassembly and maintenance.
[0037] Secondly, a battery testing device is provided, including a device body and a battery testing tray as described in any of the above embodiments, wherein the battery testing tray is disposed on the device body.
[0038] Thirdly, a battery production system is also provided, including the battery testing device in any of the above embodiments.
[0039] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description
[0040] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0041] Figure 1This is a schematic diagram of the internal metal ion migration in a cross-section of a battery cell in a related technology.
[0042] Figure 2 This is a schematic diagram of the structure of a battery test tray according to one or more embodiments of this application.
[0043] Figure 3 This is a schematic diagram showing the migration of internal metal ions in a cross-section of a battery cell under test according to one or more embodiments of this application under the action of electromagnetic force.
[0044] Figure 4 This is a schematic diagram of a rotating magnetic field in another cross section of a battery cell under test according to one or more embodiments of this application.
[0045] Figure 5 This is a top view of a tray body according to one or more embodiments of this application.
[0046] The reference numerals in the detailed embodiments are as follows:
[0047] 100. Battery test tray; 10. Tray body; 11. Bottom wall; 12. Limiting unit; 121. Limiting side wall; 1211. First limiting side wall; 1212. Second limiting side wall; 13. Receiving cavity; 20. Magnetic field generating source; 21. Magnetic rod; 30. Rotation drive mechanism; 31. Rotary motor; 32. Support platform; 200. Battery cell under test; 1. Cathode; 2. Separator; 3. Anode; 4. Metal ions. Detailed Implementation
[0048] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.
[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0050] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0051] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0052] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, 1 and / or 2 can represent: 1 existing alone, 1 and 2 existing simultaneously, and 2 existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following associated objects have an "or" relationship.
[0053] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).
[0054] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 are not intended to 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 the embodiments of this application.
[0055] 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0056] In battery manufacturing processes, performance testing of individual battery cells is essential, with K-value testing being a crucial step. Before K-value testing, individual battery cells need to be charged and discharged. During this process, metal impurity particles (such as iron and nickel) in the cathode 1 material are easily ionized under high temperature and high potential conditions, forming metal ions 4. During K-value testing, these metal ions 4 migrate from cathode 1 to anode 3 under the influence of the electric field and deposit on the surface of anode 3. When the amount deposited at a single point is large, it can form a sharp metal piercing point that penetrates the anode 3 and separator 2, leading to localized short circuits and self-discharge within the battery cell. This reduces the cycle life and reliability of the battery cell.
[0057] To mitigate the problems of partial short circuits and self-discharge in battery cells during K-testing, which reduce the cycle life and reliability of battery cells, this application provides a battery test tray, including a tray body, a magnetic field generating source, and a rotation drive mechanism. The tray body is used to support the battery cell under test. The magnetic field generating source is located on the outside of the tray body and is used to provide an electromagnetic field to the battery cell under test. The rotation drive mechanism is connected to the magnetic field generating source and is used to provide the driving force for rotating the magnetic field generating source relative to the tray body.
[0058] When the battery cell under test is being tested for K-value, the tray body can support the battery cell under test. At this time, the magnetic field source rotates under the drive of the rotation drive mechanism, and the electromagnetic field provided by the magnetic field source to the battery cell under test also rotates, thus forming a rotating magnetic field. Because the direction of the magnetic force of the rotating magnetic field is constantly changing, it will disrupt the migration path of metal ions in the cathode material to the anode, so that the metal ions are diffusely distributed on the anode surface, reducing the amount of metal ions deposited at a single point, thereby reducing the possibility of metal ions forming sharp metal puncture points on the anode surface, effectively suppressing local short circuits and battery self-discharge phenomena, and improving the cycle life and reliability of the battery cell.
[0059] The battery test tray of this application is used in a battery testing device to alleviate the problem of partial short circuits and battery self-discharge in individual battery cells during the test, which reduces the cycle life and reliability of individual battery cells.
[0060] The battery testing device disclosed in this application can be used in a battery production system. The battery production system may include processes such as battery cell assembly, electrolyte injection, formation, aging, K-value testing, and capacity testing. Formation, aging, and K-value testing can be collectively referred to as battery K-value testing. The steps for testing the battery K-value are typically as follows: charging the battery cell to a fixed capacity C to complete the formation process; allowing the formed battery cell to stand for a period of time to age and depolarize; testing the voltage of the battery cell as U1 after time t1 and as U2 after time t2, where t1 < t2 and U1 < U2; calculating the K-value: K-value = (U1 - U2) / (t2 - t1); and then testing the self-discharge performance of the battery cell based on the K-value to screen out unqualified battery cells with severe self-discharge.
[0061] Figure 1 This is a schematic diagram of the internal metal ion migration in a cross-section of a battery cell in a related technology. Figure 2 This is a schematic diagram of the structure of a battery test tray according to one or more embodiments of this application; Figure 3 This is a schematic diagram showing the migration of internal metal ions in a cross-section of a battery cell under test according to one or more embodiments of this application under the action of electromagnetic force. Figure 4 This is a schematic diagram of a rotating magnetic field in another cross-section of a single battery cell under test according to one or more embodiments of this application. See attached diagram. Figures 1-4 This application provides a battery test tray 100, including a tray body 10, a magnetic field generating source 20, and a rotation drive mechanism 30. The tray body 10 is used to support a battery cell 200 to be tested. The magnetic field generating source 20 is located on the outside of the tray body 10 and is used to provide an electromagnetic field to the battery cell 200 to be tested. The rotation drive mechanism 30 is connected to the magnetic field generating source 20 and is used to provide a driving force to make the magnetic field generating source 20 rotate relative to the tray body 10.
[0062] The tray body 10 refers to the component used to support the battery cell 200 under test. The tray body 10 can be a flat tray or a box-type tray, as long as it can support the battery cell 200 under test. The tray body 10 can be integrally molded or assembled by splicing. The material of the tray body 10 can be, but is not limited to, plastic, inorganic non-metallic materials, or wood.
[0063] The magnetic field source 20 refers to a component or device capable of generating an electromagnetic field. When the magnetic field source 20 is a component capable of generating an electromagnetic field, it can be made of a material with magnetic properties. When the magnetic field source 20 is a device capable of generating an electromagnetic field, it can generate an electromagnetic field by passing an electric current through a conductor.
[0064] The rotary drive mechanism 30 refers to a mechanism capable of generating rotational force. The rotary drive mechanism 30 typically includes a rotary motor 31. Of course, the rotary drive mechanism 30 may also include a transmission mechanism connected to the rotary motor 31, such as a gear transmission mechanism, a belt transmission mechanism, etc. It should be noted that the rotary drive mechanism 30 may also include only the rotary motor 31.
[0065] In addition, the cathode material in the battery cell 200 under test in this application embodiment can be lithium iron phosphate, ternary material, etc.
[0066] In this embodiment of the battery test tray 100, when the battery cell 200 under test is being tested for K-value, the tray body 10 can support the battery cell 200 under test. At this time, the magnetic field source 20 rotates under the driving action of the rotation drive mechanism 30, and the electromagnetic field provided by the magnetic field source 20 to the battery cell 200 under test also rotates, thereby forming a rotating magnetic field. Since the direction of the magnetic force of the rotating magnetic field is constantly changing, it will disrupt the migration path of metal ions 4 in the cathode 1 material to the anode 3, so that the metal ions 4 are diffusely distributed on the surface of the anode 3, reducing the amount of metal ions 4 deposited at a single point, thereby reducing the possibility of metal ions 4 forming sharp metal puncture points on the surface of the anode 3, effectively suppressing local short circuits and battery self-discharge phenomena, and improving the cycle life and reliability of the battery cell 200 under test.
[0067] In addition, since the battery test tray 100 of this application is used, there is no need to adjust or change the existing battery manufacturing process, thus reducing manufacturing costs.
[0068] See Figure 2 According to some embodiments of this application, the magnetic field source 20 is located below the tray body 10 in the vertical direction.
[0069] On the one hand, since the tray body 10 is used to support the battery cell 200 under test, the battery cell 200 under test is usually placed on top of the tray body 10. Placing the magnetic field source 20 directly below the tray body 10 can avoid interfering with the placement of the battery cell 200 under test. On the other hand, compared with placing it on the outer periphery of the tray body 10, placing it directly below the tray body 10 can make the distance between the magnetic field source 20 and each position of the battery cell 200 under test more uniform, so that the electromagnetic field is more uniformly distributed in each position of the battery cell 200 under test, and the metal ions 4 in the battery cell 200 under test can diffuse and distribute more reliably.
[0070] According to some embodiments of this application, the magnetic field generating source 20 includes multiple magnetic rods 21, all of which are located on the outside of the tray body 10.
[0071] The magnetic rod 21 is a component capable of generating an electromagnetic field. The magnetic rod 21 is cylindrical and has a certain length. It typically consists of a magnetic core and a stainless steel protective sleeve. The magnetic core is made of neodymium iron boron or samarium cobalt material and is specifically composed of a cylindrical magnetic block and a magnetic conductive sheet. The magnetic induction lines of the magnetic rod 21 are spatially uniformly distributed, with the point of maximum magnetic induction intensity generally filling the entire length of the rod.
[0072] When the magnetic field generating source 20 of this application embodiment includes multiple magnetic rods 21, it not only simplifies the structure of the magnetic field generating source 20, but also makes the electromagnetic field generated by the magnetic rods 21 uniform and stable. Under the action of rotational motion, it is more conducive to the uniform diffusion and distribution of metal ions 4 at various positions in the battery cell 200 under test towards the anode 3.
[0073] Furthermore, all the magnetic rods 21 are arranged side by side on one side of the tray body 10.
[0074] It should be understood that "side-by-side arrangement" means that all magnetic rods 21 are distributed parallel to each other along a straight line on the same plane. Optionally, the spacing between adjacent magnetic rods 21 is the same. In the embodiments of this application, all magnetic rods 21 are distributed parallel to each other along a straight line on a horizontal plane.
[0075] Therefore, when all the magnetic rods 21 are arranged side by side on one side of the tray body 10, they can provide a uniform electromagnetic field to the battery cell 200 under test on the tray body 10, and under the action of rotation, it is more conducive to the uniform diffusion and distribution of metal ions 4 at each position in the battery cell 200 under test towards the anode 3.
[0076] Optionally, the battery test tray 100 may have multiple magnetic rods 21, for example, 3, 5 or 7 magnetic rods 21.
[0077] Furthermore, all the magnetic rods 21 are arranged side by side along the first direction, and the magnetic field source 20 rotates around the rotation axis, with the first direction being perpendicular to the rotation axis.
[0078] Specifically, the first direction is Figure 2 The X direction is shown, and the axis of rotation is along... Figure 2 The axis of rotation extending in the Z direction is shown.
[0079] When the arrangement direction of all the magnetic rods 21 is perpendicular to the rotation axis of the magnetic field generating source 20, a uniform electromagnetic field can be formed in the region surrounding the rotation axis, which is more conducive to the uniform diffusion and distribution of metal ions 4 from each position in the battery cell 200 to the anode 3.
[0080] According to some embodiments of this application, the electromagnetic test tray also includes a metal shielding shell surrounding the outer periphery of the magnetic field generating source 20.
[0081] A metal shielding shell refers to a shell that uses the electromagnetic properties of metal materials to block or attenuate the propagation of electromagnetic fields. Optionally, the metal shielding shell can be in the form of a cover or in a ring shape, surrounding the outer periphery of the magnetic field generating source 20.
[0082] By setting a metal shielding shell around the magnetic field generator 20, the interactive magnetic field can be shielded, reducing the damage of the electromagnetic field generated by the magnetic field generator 20 to external devices.
[0083] According to some embodiments of this application, the rotary drive mechanism 30 includes a rotary motor 31, the rotary motor 31 having a rotation frequency of 5 Hz to 15 Hz.
[0084] When the rotation frequency of the rotating motor 31 is too high, the electromagnetic field will not have enough time to disturb the path of metal ions 4 in the cathode 1 material migrating to the anode 3. When the rotation frequency of the rotating motor 31 is too low, the electromagnetic field generated by the magnetic field source 20 will not be able to form a high-frequency rotating magnetic field, and thus will not be able to reliably disturb the path of metal ions 4 in the cathode 1 material migrating to the anode 3. As a result, the metal ions 4 will not be able to diffuse and distribute evenly on the surface of the anode 3.
[0085] Therefore, when the rotation frequency of the rotary motor 31 in this embodiment is 5 Hz to 15 Hz, the electromagnetic field generated by the magnetic field generator 20 can form a high-frequency rotating magnetic field, thereby reliably disrupting the migration path of metal ions 4 in the cathode 1 material to the anode 3, and allowing sufficient disruption time, improving the reliability of the diffusion distribution of metal ions 4 on the surface of the anode 3, thereby effectively suppressing local short circuits and battery self-discharge phenomena, and improving the cycle life and reliability of the battery cell.
[0086] Specifically, the rotary drive mechanism 30 also includes a support platform 32 connected to the output shaft of the rotary motor 31, and all the magnetic rods 21 are mounted on the support platform 32. Optionally, the center line of the output shaft of the rotary motor 31 coincides with the center line of the support platform 32. In this way, the output shaft of the rotary motor 31 can be subjected to balanced force, thereby improving the smoothness of the rotational motion of all the magnetic rods 21.
[0087] According to some embodiments of this application, the magnetic field strength of the electromagnetic field provided by the magnetic field generating source 20 is not less than 6000 Gauss.
[0088] When the magnetic field strength provided by the magnetic field generator 20 is not less than 6000 Gauss, the magnetic field strength is relatively high. Under the action of rotational motion, it can more reliably disrupt the migration path of metal ions 4 in the cathode 1 material to the anode 3, so that the metal ions 4 are diffusely distributed on the surface of the anode 3, reducing the amount of metal ions 4 deposited at a single point, thereby reducing the possibility of metal ions 4 forming sharp metal puncture points on the surface of the anode 3, effectively suppressing local short circuits and battery self-discharge phenomena, and improving the cycle life and reliability of the battery cell.
[0089] According to some embodiments of this application, when the battery cell 200 under test is a metal-cased battery cell, the magnetic field strength of the electromagnetic field provided by the magnetic field generating source 20 is no greater than 15,000 Gauss.
[0090] The metal-cased battery cell can be a steel-cased battery cell or a battery cell made of other metal materials.
[0091] When the battery cell 200 under test is a metal-cased battery cell, if the magnetic field strength provided by the magnetic field generating source 20 is too high, the magnetic field generating source 20 may magnetically attract the battery cell 200 under test, affecting the distribution of the electromagnetic field and reducing the reliability of the magnetic field generating source 20 in disrupting the migration path of metal ions 4 in the cathode 1 material to the anode 3 under rotational motion. Therefore, setting the magnetic field strength provided by the magnetic field generating source 20 to no more than 15000 Gauss can reduce the magnetic attraction of the battery cell 200 under test by the magnetic field generating source 20, improve the reliability of the electromagnetic field distribution, and thus improve the reliability of the magnetic field generating source 20 in disrupting the migration path of metal ions 4 in the cathode 1 material to the anode 3 under rotational motion.
[0092] Combination Figure 5 According to some embodiments of this application, the tray body 10 has a bottom wall 11 and a limiting unit 12 disposed on the bottom wall 11. The limiting unit 12 includes a plurality of limiting sidewalls 121, and all the limiting sidewalls 121 and the bottom wall 11 enclose a receiving cavity 13 for accommodating the battery cell 200 to be tested.
[0093] By using the cavity 13 to house the battery cell 200 under test, the position of the battery cell 200 under test can be effectively defined, reducing the damage to the battery cell 200 under test caused by external vibration.
[0094] Specifically, when the battery cell 200 to be tested is a square battery cell, the limiting unit 12 may include four limiting sidewalls 121, and the four limiting sidewalls 121 and the bottom wall 11 enclose a cuboid-shaped receiving cavity 13. Of course, the embodiments of this application can also use the detection of cylindrical battery cells, and the setting of the limiting sidewalls 121 can also be the same as described above.
[0095] Furthermore, the contact method between the limiting sidewall 121 and the battery cell 200 under test is surface contact.
[0096] Since the contact method between the limiting sidewall 121 and the battery cell 200 under test is surface contact, the contact area is large, which makes the limiting of the battery cell 200 under test more stable and also reduces the damage to the battery cell 200 under test caused by stress concentration.
[0097] Furthermore, each limiting sidewall 121 may include a first limiting sidewall 1211 and a second limiting sidewall 1212, with one side of the first limiting sidewall 1211 connected to one side of the second limiting sidewall 1212, and the two are arranged at a 90-degree angle.
[0098] In this way, the two adjacent surfaces of the battery cell 200 under test can be limited by the first limiting sidewall 1211 and the second limiting sidewall 1212, which improves the reliability of the limiting.
[0099] According to some embodiments of this application, at least two limiting sidewalls 121 are movable relative to each other to change the volume of the receiving cavity 13.
[0100] When the outer dimensions of the battery cell 200 under test are different, the volume of the receiving cavity 13 can be changed by adjusting the position of the limiting sidewall 121, thereby enabling the receiving cavity 13 to adapt to the outer dimensions of the battery cell 200 under test and improving the reliability of the limiting.
[0101] Optionally, all the limiting sidewalls 121 in the limiting unit 12 can move relative to each other.
[0102] According to some embodiments of this application, the tray body 10 includes a plurality of limiting units 12, all of which are spaced apart from each other on the bottom wall 11.
[0103] In this way, multiple battery cells 200 to be tested can be limited on the tray body 10 by multiple limiting units 12, and the limiting units 12 can also be modularized, which facilitates subsequent disassembly and maintenance.
[0104] Specifically, all the limiting units 12 can be arranged in a matrix.
[0105] According to some embodiments of this application, this application also provides a battery testing device, which includes a device body and a battery testing tray 100 as described in any of the above embodiments, wherein the battery testing tray 100 is disposed on the device body.
[0106] The device body refers to the body with testing functions, which may include a machine base and a controller. The machine base is equipped with a feeding mechanism, a testing mechanism, and a discharging mechanism that are connected to the controller.
[0107] In the aforementioned battery testing device, when the battery cell 200 under test is being tested for K-value, the tray body 10 can support the battery cell 200 under test. At this time, the magnetic field source 20 rotates under the driving action of the rotation drive mechanism 30, and the electromagnetic field provided by the magnetic field source 20 to the battery cell 200 under test also rotates, thereby forming a rotating magnetic field. Since the direction of the magnetic force of the rotating magnetic field is constantly changing, it will disrupt the migration path of metal ions 4 in the cathode 1 material to the anode 3, so that the metal ions 4 are diffusely distributed on the surface of the anode 3, reducing the amount of metal ions 4 deposited at a single point, thereby reducing the possibility of metal ions 4 forming sharp metal puncture points on the surface of the anode 3, effectively suppressing local short circuits and battery self-discharge phenomena, and improving the cycle life and reliability of the battery cell 200 under test.
[0108] According to some embodiments of this application, this application also provides a battery production system, including the battery testing device in any of the above embodiments.
[0109] In the aforementioned battery production system, when the battery cell 200 under test is undergoing K-value testing, the tray body 10 can support the battery cell 200 under test. At this time, the magnetic field source 20 rotates under the driving action of the rotation drive mechanism 30, causing the electromagnetic field provided by the magnetic field source 20 to the battery cell 200 under test to also rotate, thereby forming a rotating magnetic field. Since the direction of the magnetic force of the rotating magnetic field is constantly changing, it will disrupt the migration path of metal ions 4 in the cathode 1 material to the anode 3, causing the metal ions 4 to diffuse on the surface of the anode 3, reducing the amount of metal ions 4 deposited at a single point, thereby reducing the possibility of metal ions 4 forming sharp metal puncture points on the surface of the anode 3, effectively suppressing local short circuits and battery self-discharge phenomena, and improving the cycle life and reliability of the battery cell 200 under test.
[0110] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. 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 they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A battery testing tray, characterized in that, include: The tray body is used to hold the individual battery cells to be tested; A magnetic field generator is located on the outside of the tray body and is used to provide an electromagnetic field to the battery cell under test. as well as A rotary drive mechanism, connected to the magnetic field generating source, is used to provide a driving force that causes the magnetic field generating source to rotate relative to the tray body.
2. The battery test tray according to claim 1, characterized in that, The magnetic field source is located vertically below the tray body.
3. The battery test tray according to claim 1, characterized in that, The magnetic field generating source includes multiple magnetic rods, all of which are located on the outside of the tray body.
4. The battery test tray according to claim 3, characterized in that, All of the magnetic rods are arranged side by side on one side of the tray body.
5. The battery test tray according to claim 4, characterized in that, All the magnetic rods are arranged side by side along a first direction, and the magnetic field source rotates around a rotation axis, wherein the first direction is perpendicular to the rotation axis.
6. The battery test tray according to any one of claims 1 to 5, characterized in that, The battery test tray also includes a metal shielding shell that surrounds the outer periphery of the magnetic field generating source.
7. The battery test tray according to any one of claims 1 to 5, characterized in that, The rotary drive mechanism includes a rotary motor, the rotary motor having a rotation frequency of 5 Hz to 15 Hz.
8. The battery test tray according to any one of claims 1 to 5, characterized in that, The magnetic field strength provided by the magnetic field generating source is not less than 6000 Gauss.
9. The battery test tray according to claim 8, characterized in that, When the battery cell under test is a metal-cased battery cell, the magnetic field strength of the electromagnetic field provided by the magnetic field generating source is no greater than 15,000 Gauss.
10. The battery test tray according to any one of claims 1 to 5, characterized in that, The tray body has a bottom wall and a limiting unit disposed on the bottom wall. The limiting unit includes multiple limiting sidewalls, and all the limiting sidewalls and the bottom wall enclose a receiving cavity for accommodating the battery cell to be tested.
11. The battery test tray according to claim 10, characterized in that, The limiting sidewall contacts the battery cell under test in a surface contact manner.
12. The battery test tray according to claim 11, characterized in that, Each of the limiting sidewalls includes a first limiting sidewall and a second limiting sidewall, wherein one side of the first limiting sidewall is connected to one side of the second limiting sidewall, and the two are arranged at a 90-degree angle.
13. The battery test tray according to claim 10, characterized in that, At least two of the limiting sidewalls are movable relative to each other to change the volume of the receiving cavity.
14. The battery test tray according to claim 10, characterized in that, The tray body includes a plurality of limiting units, all of which are spaced apart from each other on the bottom wall.
15. A battery testing device, characterized in that, It includes a device body and a battery test tray as described in any one of claims 1 to 14, wherein the battery test tray is disposed on the device body.
16. A battery production system, characterized in that, Includes the battery testing apparatus as described in claim 15.