Test fixture for battery devices

Abstract

The embodiment of the application provides a kind of test fixture of battery device, it is related to battery test technical field.The test fixture of battery device includes clamping component, clamping component is used to set in the opposite two sides of battery device, clamping component includes heat insulating piece and heat equalizing piece.Wherein, heat insulating piece includes polyether ether ketone.Heat equalizing piece is connected with heat insulating piece, and heat equalizing piece is used to contact with battery device.The test fixture of battery device of the embodiment of the application, its heat insulating piece blocks the path that heat on battery device loses rapidly to the external environment of heat insulating piece, can avoid the abnormal mass loss of heat in battery device, so that the electric performance test result of battery device is more accurate.

Description

Technical Field

[0001] This application relates to the field of battery testing technology, and in particular to a test fixture for a battery device. Background Technology

[0002] When performing performance tests on battery devices, test fixtures are required to hold the battery devices in place.

[0003] Related technologies typically use metal clamps to hold the battery device.

[0004] However, the high thermal conductivity of metal clamps causes rapid heat loss during battery operation, resulting in inaccurate electrical performance test results for the battery device. Summary of the Invention

[0005] This application provides a test fixture for a battery device, whose heat insulation component blocks the path for rapid heat loss from the battery device to the external environment, thereby preventing abnormal and excessive heat loss from the battery device and making the electrical performance test results of the battery device more accurate.

[0006] This application provides a test fixture for a battery device, including a clamping assembly for mounting on opposite sides of the battery device. The clamping assembly includes a heat insulation component and a heat-spreading component. The heat insulation component is made of polyetheretherketone (PEEK). The heat-spreading component is connected to the heat insulation component and is used to contact the battery device.

[0007] In some possible implementations, the insulation element also includes reinforcing fibers.

[0008] In some possible implementations, the reinforcing fibers include glass fibers and / or carbon fibers.

[0009] In some possible implementations, the reinforcing fiber accounts for 0 wt% to 50 wt% of the mass of the insulation component.

[0010] In some possible implementations, the heat spreader has multiple through holes, which are arranged along the length and width of the heat spreader.

[0011] In some possible implementations, the heat exchanger is made of metal.

[0012] In some possible implementations, the heat spreader is a metal mesh, with at least a portion of the metal mesh embedded inside the insulation.

[0013] In some possible implementations, the metal component includes at least one of aluminum, copper, nickel, nickel-plated copper, or silver.

[0014] In some possible implementations, the insulation has a mounting groove, and at least part of the heat spreader is disposed inside the mounting groove.

[0015] In some possible implementations, the heat spreader is connected to the insulation component through molding, hot pressing, 3D printing, or secondary wrapping.

[0016] In some possible implementations, there is a gap between the heat spreader and the battery tabs along the length of the heat insulation component.

[0017] In some possible implementations, the length of the interval is 1mm to 6mm.

[0018] In some possible implementations, the clamping assembly also includes a support member connected to a heat insulation member, with the support member located on the side of the heat insulation member away from the heat spreader, and the heat insulation member being disposed between the battery device's tabs and the support member to isolate the tabs from the support member.

[0019] In some possible implementations, the support is made of metal.

[0020] In some possible implementations, the metal component includes at least one of aluminum, copper, nickel, nickel-plated copper, or silver.

[0021] In some possible implementations, the support has a stepped portion, and the thermal insulation is connected to the stepped portion.

[0022] In some possible implementations, there are two or more clamping components, with at least one clamping component positioned on one side of the battery device and the remaining clamping components positioned on the other side of the battery device, and at least one clamping component and the remaining clamping components used together to clamp the battery device.

[0023] The battery device test fixture also includes a connecting assembly, which comprises a connector and an elastic element. The connector includes a limiting section and a connecting section; at least one clamping component is fixedly connected to the connecting section, while the remaining clamping components are movably connected to the connecting section. The elastic element is disposed between the limiting section and the remaining clamping components.

[0024] In some possible implementations, the elastic element is a disc spring.

[0025] The battery device test fixture provided in this application embodiment has two clamping components positioned on opposite sides of the battery device during testing to stably clamp the battery device. The heat spreader in each clamping component is in direct contact with the battery device. This arrangement utilizes the excellent thermal conductivity and heat amplification capabilities of the heat spreader to rapidly and evenly conduct the localized heat generated on the surface of the battery device during charging and discharging to the entire contact surface of the battery device, thereby eliminating localized heat accumulation on the battery device surface and achieving surface homogenization.

[0026] Meanwhile, the heat insulation component connected to the heat spreader is located on the outside of the heat transfer path. The heat insulation component, with its low thermal conductivity, effectively blocks the path for heat on the heat spreader to dissipate rapidly to the external environment. This avoids abnormal and excessive heat loss from the battery device and ensures the uniformity and stability of the overall temperature field of the battery device. As a result, it significantly reduces the interference of temperature fluctuations on the measurement of battery electrical performance parameters, and ultimately achieves the beneficial effect of improving the accuracy and reliability of battery device electrical performance testing.

[0027] Polyetheretherketone (PEEK) material itself possesses excellent rigidity, wear resistance, compressive strength, and creep resistance. Therefore, when the thermal insulation component is made of PEEK, it can withstand the test pressure applied to the battery device during testing without deformation, thus ensuring that the test fixture can provide stable and reliable clamping support for the battery device. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0029] Figure 1 A schematic diagram of a battery device being held in a test fixture according to an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of a structure for connecting a heat insulation component and a heat-spreading component according to an embodiment of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 10. Test fixture; 20. Battery assembly; 21. Electrode tabs;

[0033] 100. Clamping assembly; 110. Thermal insulation component; 111. Mounting groove; 120. Heat spreader; 121. Through hole; 130. Support component; 131. Stepped section;

[0034] 200. Connecting component; 210. Connector; 211. Limiting segment; 212. Connecting segment; 220. Elastic element.

[0035] To facilitate understanding of the embodiments of this application, the spline curves and arrows used in the reference numerals in the accompanying drawings are explained below: the components indicated by spline curves without arrows can be solid components, that is, components with solid structures; the components indicated by spline curves with arrows can be virtual components, that is, components without solid structures; in some cases, the components indicated by spline curves with arrows can also be assemblies with solid structures or virtual structures.

[0036] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In the description of the embodiments of this application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships (if present), are based on the orientation or positional relationships shown in the accompanying drawings, and 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, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this application. Furthermore, 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..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Where there is no conflict, embodiments of this application and the various features thereof can be combined with each other, all of which are within the scope of protection of this application.

[0039] When performing performance testing on battery devices, test fixtures are required to hold the devices. This is especially true for all-solid-state batteries (ASSBs). Unlike traditional lithium-ion batteries, which rely on a liquid electrolyte to spontaneously wet porous electrodes and establish ion pathways, all-solid-state batteries rely on the solid-solid physical contact between a rigid solid electrolyte and the electrodes to conduct Li⁺. Because there is no mobile phase to fill the microscopic voids, all-solid-state batteries require externally applied and maintained axial stacking pressure throughout assembly, formation, and cycling to overcome interfacial gaps caused by surface roughness, compensate for the volumetric "breathing effect" caused by lithium insertion / extraction from the electrode active materials, and suppress interfacial contact failure during cycling. Furthermore, while traditional liquid-state cells often use graphite or graphite doped with a small amount of silicon as the negative electrode, all-solid-state batteries typically use high-capacity silicon-based materials and lithium metal as the negative electrode to improve energy density. Graphite anodes are composed of layered carbon atoms. Lithium-ion insertion mainly occurs between these layers, without disrupting the overall crystal structure. In a fully lithiated state, the theoretical volume expansion rate is approximately 10%-15%, which is relatively low. Silicon-based anodes, however, store lithium through an alloying reaction, where lithium forms various alloy phases with silicon. This process involves significant volume changes, with volume expansion reaching 300%-400% during charge and discharge. During the charge and discharge of all-solid-state batteries, silicon-based anodes undergo significant volume expansion and contraction. Without continuous pressure restraint, this volume change can lead to poor solid-solid contact, increased interfacial impedance, and consequently, capacity decay, even a sharp drop.

[0040] If an all-solid-state battery is operated without external clamps or under insufficient pressure (below the critical value), the following typical problems will occur:

[0041] 1) Loss of interface contact. Point contact → minimal conductive area → dramatic increase in Rct (Charge Transfer Resistance) and Rtotal (Total Resistance) → extremely low initial capacity or inability to discharge.

[0042] 2) Internal layering of the cell. After several cycles, the electrodes physically separate from the solid electrolyte, the EIS (Electrochemical Impedance Spectroscopy) semicircle increases sharply, the voltage polarization is large, and the capacity drops drastically.

[0043] 3) Interface "dead zones". Some areas are completely non-contact → uneven local current density → hot spots or local Li deposition → accelerated aging.

[0044] 4) Irreversible contact degradation. Low pressure causes the particles to loosen and the contact points to break. Even if the pressure is restored, the initial impedance cannot be fully restored.

[0045] 5) Decreased critical current density. Interfacial gaps lead to localized current concentration → dendrite nucleation becomes easier → short-circuit risk.

[0046] Therefore, specialized pressure fixtures (molds, hydraulic presses, or spring-loaded constant-pressure fixtures) are essential components of ASSB electrochemical testing and performance verification, rather than auxiliary tooling. Depending on the electrolyte system classification, the required operating stack pressure (cycles / tests) for each type of electrolyte system cell varies: typical values ​​are 5–20 MPa for sulfides, 5–30 MPa for oxides, and 0.1–2 MPa for polymers.

[0047] Related technologies typically use metal clamps to hold the battery device.

[0048] During electrical performance testing of battery devices (such as charge / discharge testing, rate performance testing, or cycle life testing), heat is generated inside the battery device due to electrochemical reactions and internal resistance. Related technologies directly use metal clamps to hold the battery device. Because metal has extremely high thermal conductivity, the clamps absorb and conduct a large amount of heat dissipated from the battery device surface very quickly. This rapid heat loss causes the actual operating temperature of the battery device during testing to be significantly lower than its true or preset operating temperature, and easily forms a large temperature gradient on the battery device surface, thus disrupting the thermal equilibrium state of the battery device's testing environment. Therefore, since the battery device's capacity, internal resistance, rate performance, and other electrical performance indicators are extremely sensitive to temperature, abnormal heat loss and uneven distribution will directly cause the electrical performance parameters collected during testing to deviate from their true values, severely reducing the accuracy and consistency of the battery device's electrical performance test results.

[0049] Figure 1 This is a schematic diagram of a structure in which the battery device 20 provided in the embodiments of this application is held by the test fixture 10.

[0050] In view of this, such as Figure 1 As shown in the illustration, this application provides a test fixture 10 for a battery device 20, including a clamping assembly 100. The clamping assembly 100 is disposed on opposite sides of the battery device 20, and includes a heat insulation element 110 and a heat spreader 120. The heat insulation element 110 is made of polyetheretherketone (PEEK). The heat spreader 120 is connected to the heat insulation element 110 and is used to contact the battery device 20.

[0051] During testing, the clamping assembly 100 is positioned on opposite sides of the battery device 20 to stably clamp the battery device 20. The heat spreader 120 within the clamping assembly 100 is in direct contact with the battery device 20. This arrangement utilizes the excellent thermal conductivity and heat amplification capabilities of the heat spreader 120 to rapidly and evenly conduct the localized heat generated on the surface of the battery device 20 during charging and discharging to the entire contact surface of the battery device 20, thereby eliminating localized heat accumulation on the surface of the battery device 20 and achieving temperature homogenization of the battery surface.

[0052] Meanwhile, the heat insulation component 110, which is connected to the heat spreader 120, is located on the outside of the heat transfer path. The heat insulation component 110, with its low thermal conductivity, effectively blocks the path for the heat on the heat spreader 120 to be rapidly dissipated to the external environment. In this way, abnormal large-scale heat loss inside the battery device 20 is avoided, and the uniformity and stability of the overall temperature field of the battery device 20 are ensured. This significantly reduces the interference of temperature fluctuations on the measurement of battery electrical performance parameters, and ultimately achieves the beneficial effect of improving the accuracy and reliability of the battery device 20 electrical performance test.

[0053] Polyetheretherketone (PEEK) material itself possesses excellent rigidity, wear resistance, compressive strength, and creep resistance. Therefore, when the heat insulation component 110 is made of PEEK, it can withstand the test pressure applied to the battery device 20 during testing without deformation, thereby ensuring that the test fixture 10 can provide stable and reliable clamping support for the battery device 20.

[0054] Furthermore, the density of polyetheretherketone is significantly lower than that of traditional metal materials (for example, the density of polyetheretherketone parts is only 1 / 6 of that of steel fixtures). This arrangement can effectively reduce the overall weight of the heat insulation component 110 and the test fixture 10, thereby reducing the impact on the energy density of the battery device 20 in the test system (including the battery device 20 and the test fixture 10).

[0055] In addition, polyetheretherketone (PEEK) has a low thermal conductivity, approximately 0.25 W / (m·K), which is 2-3 times lower than that of metals and 5-10 times lower than that of ceramics. This provides excellent heat insulation and preservation for the battery device 20, preventing the heat generated during operation from dissipating too quickly and ensuring that the battery device 20 remains within a suitable operating temperature range. For all-solid-state batteries, temperature is crucial for their electrochemical performance, especially for polymer-based all-solid-state batteries. For example, polymer all-solid-state batteries have an optimal operating temperature of 60-80°C, and often require external heating when self-generated heat is insufficient.

[0056] In this way, the heat insulation component 110, including polyetheretherketone, can keep the ionic conductivity inside the battery device 20 at a high level, so that its cell capacity and rate performance can be fully and well utilized, thereby significantly improving the accuracy of the battery device 20's electrical performance test results.

[0057] In addition, polyetheretherketone (PEEK) material has good insulation properties. Even if the heat insulation component 110 comes into contact with the tab 21 of the battery device 20, no electrical conduction will occur, thereby avoiding short circuit problems and ensuring the safety and reliability of the testing process.

[0058] In some embodiments, the battery device 20 can be an all-solid-state battery (sulfide, oxide, polymer, composite electrolyte, etc.), a semi-solid-state battery (polymer, gel, oxide, sulfide, composite electrolyte, etc.), or a liquid battery. Specifically, the battery device 20 can be any electrochemical energy storage device that requires performance testing, such as a battery cell, battery unit, battery module, or battery pack.

[0059] In some embodiments, the clamping assembly 100 may be disposed on both sides of the large surface of the battery device 20.

[0060] In some embodiments, the heat spreader 120 may be a flat plate, a mesh, a grid, or an adhesive with an undulating structure.

[0061] In some embodiments, the heat insulation element 110 may be a block, plate, or structure with foamed pores.

[0062] In some embodiments, the heat insulation component 110 can be integrally formed from pure polyetheretherketone resin by injection molding, compression molding, or machining. In other embodiments, the heat insulation component 110 can also be a modified polyetheretherketone component made by blending or compounding polyetheretherketone with other auxiliary materials.

[0063] In some embodiments, functional additives such as antistatic agents, flame retardants, or lubricants may be added to the polyetheretherketone material as needed to meet the usage requirements under different test conditions.

[0064] In some embodiments, the thermal insulation component 110 may be an integrally formed plate or block, or a shaped component with local grooves or curved surfaces that matches the appearance of the battery device 20. Furthermore, the thermal insulation component 110 may be a single-layer structure or a multi-layered structure made of multiple sheets containing polyetheretherketone through composite processes such as hot pressing, bonding, or insert injection molding.

[0065] In some possible implementations, the insulation element 110 also includes reinforcing fibers.

[0066] By adding reinforcing fibers to the polyetheretherketone (PEEK) insulation component 110, the reinforcing fibers can form a mesh or skeleton support structure inside the PEEK matrix, thereby significantly improving the tensile strength, flexural modulus, and creep resistance of the insulation component 110. This design makes the insulation component 110 less prone to structural deformation or mechanical damage when clamping the battery device 20 and bearing a large clamping force, thus effectively ensuring the structural stability and mechanical durability of the insulation component 110, and extending the service life of the test fixture 10.

[0067] In some embodiments, the reinforcing fiber can be an organic fiber or an inorganic fiber. Specifically, the reinforcing fiber can be at least one of glass fiber, carbon fiber, aramid fiber, basalt fiber, silicon carbide fiber, or boron fiber. The main functions of glass fiber include enhancing tensile / flexural strength, increasing elastic modulus, improving creep resistance, increasing heat distortion temperature (greater than 300°C), and enhancing dimensional stability. The main functions of carbon fiber include significantly improving rigidity, creep resistance, abrasion resistance, and electrical conductivity, reducing volume resistivity, and significantly reducing the coefficient of thermal expansion (approaching zero).

[0068] In some embodiments, the reinforcing fibers in the thermal insulation 110 can be chopped fibers, continuous fibers, whiskers, or fibrous fabrics. Thus, when the reinforcing fibers are chopped fibers or whiskers, they can be uniformly dispersed in the polyetheretherketone (PEEK) matrix through injection molding, compression molding, or extrusion; when the reinforcing fibers are fibrous fabrics or continuous fibers, they can be combined with PEEK through lamination or hot-pressing to meet the mechanical requirements under different clamping loads.

[0069] In some embodiments, the reinforcing fibers inside the insulation member 110 can be arranged randomly and isotropically, or they can be oriented or gradient-distributed along the stress direction of the insulation member 110. Therefore, based on the stress distribution characteristics experienced by the test fixture 10 during clamping, the deformation resistance of the insulation member 110 in a localized or specific direction can be specifically enhanced.

[0070] In some possible implementations, the reinforcing fiber accounts for 0 wt% to 50 wt% of the mass of the insulation component 110.

[0071] When the mass percentage of reinforcing fiber in the thermal insulation component 110 is controlled between 0 wt% and 50 wt%, the thermal insulation component 110 can maintain the extremely low thermal conductivity and excellent toughness of the pure polyether ether ketone matrix if no reinforcing fiber is added (i.e., the mass percentage is 0 wt%). When reinforcing fiber is added and its mass percentage is controlled within 50 wt%, the problem of excessive increase in thermal conductivity or increased material brittleness of the thermal insulation component 110 due to excessive reinforcing fiber content can be effectively avoided.

[0072] Meanwhile, within the aforementioned mass ratio range, the reinforcing fiber can form a good interfacial bond with the polyetheretherketone matrix, significantly improving the tensile strength, flexural modulus, and wear resistance of the thermal insulation component 110, making it less prone to structural deformation or damage when subjected to repeated clamping stress.

[0073] Therefore, limiting the mass percentage of reinforcing fiber to 0wt%~50wt% not only ensures the high-efficiency thermal insulation performance of the thermal insulation component 110, but also takes into account the mechanical strength and long-term durability necessary for it as a clamping structure, thereby ensuring the structural stability of the clamping component 100 and the accuracy of test results during long-term use.

[0074] In some embodiments, the mass percentage of reinforcing fibers in the insulation component 110 can be 0wt%, 5wt%, 10wt%, 15wt%, 20wt%, 25wt%, 30wt%, 35wt%, 40wt%, 45wt%, or 50wt%, etc.

[0075] In some embodiments, when the reinforcing fiber comprises both glass fiber and carbon fiber, the total mass ratio of glass fiber and carbon fiber in the thermal insulation component 110 is 0wt% to 50wt%. The relative mass ratio of glass fiber to carbon fiber can be flexibly adjusted according to the actual test temperature and clamping force requirements. For example, the mass ratio of glass fiber to carbon fiber can be 1:1, 1:2, 2:1, or 1:3, etc., to meet the differentiated requirements for the strength and thermal insulation of the thermal insulation component 110 under different test environments.

[0076] Figure 2 This is a schematic diagram of a structure for connecting the heat insulation component 110 and the heat equalization component 120 provided in an embodiment of this application.

[0077] In some possible implementations, such as Figure 2 As shown, the heat spreader 120 has a plurality of through holes 121, and each through hole 121 is arranged along the length direction and the width direction of the heat insulation member 110.

[0078] When the through holes 121 are uniformly arranged along the length and width directions of the heat insulation component 110, the heat spreader 120 forms an array-like grid structure. On the one hand, the through holes 121 effectively remove redundant metal mass on the heat spreader 120, significantly reducing the overall weight of the clamping assembly 100, thereby reducing the impact on the energy density test results of the battery device 20 in the test system. On the other hand, since the heat spreader 120 (such as a metal component) has an extremely high in-plane thermal conductivity, heat can rapidly diffuse and spread laterally along the continuous metal grid around the through holes 121 in the length and width directions. Furthermore, the array-arranged through holes 121 ensure that the heat spreader 120 maintains equivalent and consistent thermal resistance characteristics across the entire contact plane, thereby preventing the generation of macroscopic temperature gradients or local hot spots on the surface of the battery device 20.

[0079] This design achieves lightweight fixture structure while still ensuring excellent planar heat dissipation performance of heat spreader 120, thus guaranteeing the consistency of ambient temperature and accuracy of test results for the electrical performance testing of battery device 20.

[0080] In some embodiments, the cross-sectional shape of the through hole 121 can be any one or more combinations of a circle, parallelogram, rectangle, square, polygon (such as a regular hexagon), ellipse, or irregular shape, and the side length of the structural shape can be 1mm-100mm. Among them, when the through hole 121 is selected as a regular hexagon and arranged in a honeycomb pattern, the mass of the heat spreader 120 can be reduced to the maximum extent while maintaining good mechanical strength and thermal conductivity continuity of the heat spreader 120.

[0081] In some embodiments, the arrangement of each through hole 121 along the length and width directions of the heat insulation member 110 can be a matrix arrangement, a staggered (chessboard) arrangement, or an array arrangement.

[0082] In some embodiments, the distribution density of the various through holes 121 on the heat spreader 120 can be uniform or non-uniform. For example, in the portion of the heat spreader 120 corresponding to the heat concentration area of ​​the battery device 20, the distribution density of the through holes 121 can be relatively small (i.e., low porosity) to ensure sufficient heat spreader capacity; while in the heat dispersion area, the distribution density of the through holes 121 can be relatively large (i.e., high porosity), thereby further optimizing the balance between heat spreader and weight reduction.

[0083] In some embodiments, the aperture of the through hole 121 and the spacing between adjacent through holes 121 can be adjusted according to the material of the heat spreader 120 and the heat dissipation requirements of the battery device 20. This can balance the thermal conductivity and temperature uniformity performance of the heat spreader 120 with the weight reduction effect, so as to meet the testing requirements of battery devices 20 of different specifications.

[0084] In some possible implementations, the heat exchanger 120 is a metal component.

[0085] In particular, since the metal material itself has excellent thermal conductivity, when the heat spreader 120 is in contact with the surface of the battery device 20 and is tested, the heat generated locally in the battery device 20 during charging and discharging can be quickly and evenly conducted and diffused to the whole body through the metal heat spreader 120. This can effectively eliminate the phenomenon of local heat accumulation on the surface of the battery device 20, avoid excessive temperature gradient, and thus ensure the high uniformity of surface temperature distribution of the battery device 20 during the test.

[0086] Therefore, setting the heat spreader 120 as a metal part can significantly improve the stability and uniformity of the thermal environment of the battery device 20 during the test, thereby ensuring the accuracy and reliability of the electrical performance test data.

[0087] In some embodiments, the specific structural form of the metal component is not strictly limited. The metal component can be a flat metal plate or metal foil, or it can be a metal mesh with a porous structure, a sintered metal plate, or a foam metal component. Such an arrangement can adapt to different processing techniques and adjust the overall mass and heat capacity.

[0088] In some embodiments, the contact surface of the metal component facing the battery device 20 may also undergo surface modification treatment. For example, the surface of the metal component may be anodized, micro-arc oxidized, passivated, or coated with a thin thermally conductive and insulating coating (such as a nano-ceramic coating, a high thermal conductivity polyimide coating, etc.). In this way, the rapid heat conduction will not be significantly affected, and the accidental short circuit or electrochemical corrosion between the metal heat spreader 120 and the battery device 20 casing can be effectively prevented, thereby further improving the safety of the testing process.

[0089] In some possible implementations, the heat spreader 120 is a metal mesh, with at least a portion of the metal mesh embedded inside the heat insulation component 110. This configuration allows the clamping assembly 100 to have good thermal insulation performance and also provides better heat spreader coverage for the battery device 20, preventing localized overheating.

[0090] The metal mesh can be formed by welding or weaving multiple metal wires.

[0091] In some embodiments, the diameter of the metal wire can be 0.1mm-50mm, for example, 0.1mm, 0.2mm, 0.5mm, 0.7mm, 1mm, 5mm, 10mm, 20mm, 25mm, 30mm, 40mm or 50mm.

[0092] In some embodiments, the maximum width of the mesh openings of the metal mesh is 0.1mm-50mm, for example, 0.1mm, 0.2mm, 0.5mm, 0.7mm, 1mm, 5mm, 10mm, 20mm, 25mm, 30mm, 40mm, or 50mm. When the maximum width of the mesh openings of the metal mesh is 0.1mm-10mm (for example, 0.1mm, 0.2mm, 0.5mm, 0.7mm, 1mm, 5mm, 10mm, etc.), the heat dissipation effect of the metal mesh is better, and the difference between its heat dissipation effect and that of the plate-shaped heat dissipation element 120 is small.

[0093] In some possible implementations, the metal component includes at least one of aluminum, copper, nickel, nickel-plated copper, or silver.

[0094] The heat spreader 120 is made of a metal, including aluminum, copper, nickel, nickel-plated copper, or silver. Aluminum, copper, nickel, nickel-plated copper, and silver all possess high thermal conductivity and excellent heat transfer efficiency. Therefore, during testing, when the heat spreader 120 is in contact with the surface of the battery device 20, the metal can utilize its high thermal conductivity to rapidly absorb heat locally generated on the surface of the battery device 20 and quickly conduct and evenly distribute the heat along the extension direction of the heat spreader 120. This effectively avoids localized overheating or excessive temperature gradients on the surface of the battery device 20, ensuring a consistent temperature distribution on the surface of the battery device 20. Furthermore, materials such as nickel, nickel-plated copper, and silver also possess excellent oxidation and corrosion resistance. Thus, even when the heat spreader 120 is in frequent contact with the battery device 20 or under complex testing environments, its contact surface is not prone to oxidation or corrosion, maintaining a stable thermal conductivity interface over a long period.

[0095] Therefore, this configuration can effectively improve the heat dissipation efficiency, response speed and service life of the heat dissipation element 120, thereby further ensuring the accuracy and reliability of the electrical performance test results of the battery device 20.

[0096] In some embodiments, the metal part can be an aluminum plate or aluminum foil made of pure aluminum or aluminum alloy, which has the characteristics of low density, light weight and low cost, and can reduce the overall weight of the test fixture 10 while achieving rapid heat equalization, making it easy to operate.

[0097] In some embodiments, the metal part may be a copper plate or copper foil made of pure copper or copper alloy, which utilizes the extremely high thermal conductivity of copper to achieve excellent thermal response speed and heat uniformity.

[0098] In some embodiments, the metal part can be a copper-plated nickel part, with copper as the base material and a nickel plating layer on the surface. This retains the high thermal conductivity of copper while enhancing the hardness, wear resistance and corrosion resistance of the surface of the heat spreader 120 with the help of the nickel plating layer.

[0099] In some embodiments, the metal part may also be a thin sheet of metal made of silver or a silver-containing alloy, which has extremely high thermal conductivity and excellent chemical stability, making it suitable for precision testing scenarios with extremely high requirements for temperature uniformity.

[0100] In some embodiments, the metal part may also be a multi-layer composite metal sheet made of two or more materials selected from aluminum, copper, nickel, copper plated with nickel or silver through processes such as hot rolling, electroplating or lamination, thereby taking into account high thermal conductivity, high mechanical strength and good surface protection performance.

[0101] In some possible implementations, such as Figure 1 As shown, the heat insulation element 110 has a mounting groove 111, and at least part of the heat distribution element 120 is disposed inside the mounting groove 111.

[0102] By providing a mounting groove 111 on the heat insulation component 110 and placing at least a portion of the heat spreader 120 inside the mounting groove 111, the mounting groove 111 can physically limit and spatially accommodate the heat spreader 120. This significantly increases the lateral and bottom contact area between the heat spreader 120 and the heat insulation component 110, thereby greatly improving the connection strength and shear resistance between them, effectively preventing the heat spreader 120 from loosening, misaligning, or peeling off during frequent clamping and unclamping of the battery device 20.

[0103] Meanwhile, embedding the heat spreader 120 into the mounting groove 111 reduces the height of the heat spreader 120 protruding from the surface of the heat insulation component 110, thereby effectively controlling the overall thickness and volume of the clamping assembly 100. Therefore, this arrangement not only ensures the compactness of the internal structure of the test fixture 10, but also significantly improves the structural stability and service life of the clamping assembly 100.

[0104] In some embodiments, the heat spreader 120 may be completely disposed inside the mounting groove 111, and the surface of the heat spreader 120 facing away from the bottom wall of the mounting groove 111 is flush with the corresponding surface of the heat insulation member 110; in other embodiments, the heat spreader 120 may be only partially disposed inside the mounting groove 111, and the surface of the heat spreader 120 facing away from the bottom wall of the mounting groove 111 protrudes from the surface of the heat insulation member 110, so as to ensure that the heat spreader 120 can preferentially and fully contact the battery device 20.

[0105] In some embodiments, the outline shape of the mounting groove 111 can match the outer shape of the heat spreader 120. For example, the mounting groove 111 can be a rectangular groove, a square groove, a circular groove, or an irregularly shaped groove. In other embodiments, the cross-sectional area of ​​the mounting groove 111 can be slightly larger than the cross-sectional area of ​​the heat spreader 120 to facilitate assembly or reserve space for adhesive bonding.

[0106] In some embodiments, the mounting groove 111 may be a single, continuously extending groove; in other embodiments, the mounting groove 111 may also be a plurality of sub-grooves arranged in an array or at intervals, each sub-groove being used to accommodate the separately configured heat spreader 120.

[0107] In some embodiments, the heat spreader 120 and the mounting groove 111 can be fixedly connected by mechanical structures such as interference fit, snap fit or positioning pin; in other embodiments, the heat spreader 120 and the bottom or wall of the mounting groove 111 can be bonded and fixed by adhesives such as structural adhesive or thermally conductive adhesive.

[0108] Alternatively, in some other embodiments, the heat spreader 120 can be connected to the heat insulation component 110 by molding, hot pressing, 3D printing, or secondary wrapping.

[0109] The heat spreader 120 and the heat insulation component 110 are connected through molding, hot pressing, 3D printing, or secondary coating. This allows for a seamless and high-strength physical or chemical bond at the interface between the heat spreader 120 and the heat insulation component 110, thus avoiding gaps and stress concentration problems that may be introduced by traditional bolt fastening or mechanical snap-fit ​​connections. This not only eliminates air thermal resistance at the interface, ensuring the stability of heat conduction between the heat spreader 120 and the heat insulation component 110, but also effectively prevents interface peeling, loosening, or detachment of the test fixture 10 when repeatedly clamping the battery device 20 or under alternating thermal stress. This significantly improves the structural integrity and fatigue resistance of the clamping assembly 100.

[0110] This configuration ensures that the test fixture 10 maintains a stable and reliable connection in a long-term, high-frequency electrical performance testing environment, significantly extending the service life of the test fixture 10 and guaranteeing the accuracy of the test data.

[0111] In some embodiments, the heat spreader 120 and the heat insulation component 110 are connected by a molding composite method. Specifically, the pre-formed heat spreader 120 can be placed into a mold, and molten or powdered heat insulation material (such as a composite material containing polyether ether ketone and reinforcing fibers) can be filled into the mold. Molding is then performed under a predetermined temperature and pressure to solidify the heat insulation material and tightly cover or adhere it to the surface of the heat spreader 120, thereby achieving a tight integral molding of the two components.

[0112] In other embodiments, the heat spreader 120 and the heat insulation component 110 are connected by hot pressing. Specifically, the pre-formed heat spreader 120 and the pre-formed heat insulation component 110 can be stacked, and a predetermined temperature and pressure are applied at the interface between the two. The high temperature causes the surface of the heat insulation component 110 to slightly melt or the intermediate hot melt adhesive layer to melt, followed by cooling and solidification, thereby firmly hot pressing the heat spreader 120 and the heat insulation component 110 together.

[0113] In some other embodiments, the heat spreader 120 and the heat insulation component 110 are connected by 3D printing. Specifically, the heat insulation material can be printed and stacked layer by layer on the heat spreader 120 substrate using additive manufacturing technology to form the heat insulation component 110; or, using multi-material 3D printing equipment, the materials of the heat spreader 120 and the heat insulation component 110 can be printed continuously or in gradients simultaneously. This allows for precise control of the micro-interlocking structure of the bonding surface, further improving the interfacial bonding strength.

[0114] Furthermore, in some embodiments, the heat spreader 120 and the heat insulation component 110 are connected by a secondary encapsulation method. Specifically, the heat spreader 120 can be placed as a prefabricated insert into the cavity of a secondary molding mold, and then molten heat insulation material is injected into the mold cavity to perform injection molding or overmolding on a portion or edge of the heat spreader 120, thereby allowing the heat insulation component 110 to tightly embed and fix at least a portion of the heat spreader 120.

[0115] In some possible implementations, such as Figure 1 As shown, along the length of the heat insulation member 110, there is a gap between the heat spreader 120 and the tab 21 of the battery device 20, as shown in the figure. Figure 1 As shown in D in the diagram.

[0116] When the clamping assembly 100 clamps the battery device 20 for testing, the spacing can spatially separate the heat spreader 120 and the tab 21, thereby avoiding direct physical contact between the heat spreader 120 and the tab 21. This effectively blocks the conductive path between the tab 21 and the heat spreader 120, thus completely eliminating the short circuit problem caused by contact between the tab 21 and the heat spreader 120, ensuring the safety of the battery device 20 testing process and the accuracy of the test data.

[0117] In some embodiments, the heat spreader 120 is fully embedded inside the mounting groove 111 on the heat insulation member 110. Thus, the heat insulation member 110 can further physically block the heat spreader 120 and the tab 21 on the path between the heat spreader 120 and the tab 21, thereby effectively blocking the conductive path between the tab 21 and the heat spreader 120.

[0118] In some embodiments, the dimension of the heat spreader 120 in the length direction of the heat insulation member 110 is smaller than the length dimension of the heat insulation member 110, thereby creating a natural gap between the end of the heat spreader 120 and the tab 21 when the heat spreader 120 is attached to the surface of the battery device 20.

[0119] In some embodiments, the gap can be an air-filled insulating gap, or the gap area can be filled with a soft insulating pad or an insulating coating. This configuration not only achieves electrical isolation between the heat spreader 120 and the tab 21, but also prevents foreign objects from falling into the gap during the test and causing accidental contact.

[0120] In some possible implementations, such as Figure 1 As shown in D, the interval length is 1mm~6mm.

[0121] When the length of the gap between the heat spreader 120 and the tab 21 of the battery device 20 in the longitudinal direction of the heat insulation component 110 is less than 1 mm, the conductive heat spreader 120 may still touch the tab 21 and cause a short circuit during the assembly process of the test fixture 10 or the testing process of the battery device 20 due to slight displacement.

[0122] When the length of the interval is greater than 6mm, the effective contact area between the heat spreader 120 and the main body of the battery device 20 will be excessively compressed, thereby weakening the heat spreader 120's heat spreader effect on the battery device 20.

[0123] Therefore, by reasonably limiting the length of the interval to 1mm~6mm, on the one hand, it can reliably block the physical contact between the heat spreader 120 and the tab 21 under the premise of fully considering manufacturing tolerances, assembly errors and slight changes in thermal expansion during the testing process, thereby completely eliminating the risk of short circuit and ensuring the safety and stability of the testing process; on the other hand, it will not excessively occupy the laying space of the heat spreader 120, ensuring that the heat spreader 120 has sufficient coverage area on the surface of the battery device 20, thus taking into account both the short circuit prevention safety and efficient heat spreader performance of the test fixture 10.

[0124] In some embodiments, the length of the gap between the heat spreader 120 and the tab 21 of the battery device 20 along the length of the heat insulation member 110 can be selected from any specific value between 1 mm and 6 mm. For example, the gap length can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, or 6 mm, etc. This allows for flexible configuration according to battery devices 20 of different sizes and testing requirements.

[0125] In some embodiments, the edge shape of the heat spreader 120 facing the tab 21 can be straight, grooved, oblique, or curved. The key requirement is that the closest distance between the edge of the heat spreader 120 facing the tab 21 and the tab 21 is maintained within the range of 1mm to 6mm along the length of the heat insulation member 110. This not only allows for adaptation to battery devices 20 with different tab 21 shapes or multi-tab 21 layouts, but also further improves the versatility and manufacturing flexibility of the test fixture 10.

[0126] In some possible implementations, such as Figure 1 As shown, the clamping assembly 100 also includes a support member 130, which is connected to the heat insulation member 110. The support member 130 is located on the side of the heat insulation member 110 away from the heat spreader 120. The heat insulation member 110 is used to be disposed between the tab 21 of the battery device 20 and the support member 130 to isolate the tab 21 from the support member 130.

[0127] By providing a support member 130 on the side of the heat insulation member 110 away from the heat spreader 120, the overall mechanical strength and rigidity of the clamping assembly 100 can be significantly enhanced, effectively preventing the clamping assembly 100 from bending or undergoing local deformation when clamping force is applied to the battery device 20.

[0128] Furthermore, the heat insulation component 110 is placed between the tab 21 of the battery device 20 and the support component 130. By utilizing the good insulation properties of the heat insulation component 110 itself, the charged tab 21 of the battery device 20 is physically separated from the support component 130, thereby blocking the electrical path between the tab 21 and the support component 130. In this way, the risk of short circuit or leakage caused by contact between the tab 21 and the support component 130 during the test can be completely eliminated.

[0129] Therefore, this embodiment not only ensures the structural support stability of the test fixture 10, but also greatly improves the electrical safety and accuracy of the test data during the testing process of the battery device 20.

[0130] In some embodiments, the connection between the support member 130 and the heat insulation member 110 can be a variety of fixed connection methods. Specifically, the support member 130 and the heat insulation member 110 can be detachably connected by fasteners such as screws and bolts, or they can be fixedly connected by adhesive, snap-fit, interference fit, or other methods, or they can be tightly combined by integrated methods such as molding, injection molding, etc.

[0131] In some embodiments, the structural form of the support member 130 can be flexibly adjusted according to the spatial layout. For example, the support member 130 can be a flat plate, a frame, a beam structure with reinforcing ribs, or a block structure, as long as it can be located on the side of the heat insulation member 110 away from the heat spreader 120 and provide structural support.

[0132] In some embodiments, the heat insulation member 110 can isolate the electrode tab 21 from the support member 130 by extending an insulating baffle, insulating flange, or insulating boss on the heat insulation member 110, so that the insulating baffle, insulating flange, or insulating boss extends into the gap between the electrode tab 21 and the support member 130, thereby achieving complete physical isolation and insulation protection between the electrode tab 21 and the support member 130 in space.

[0133] In some embodiments, the support member 130 can be a non-metallic part such as high-strength engineering plastic, carbon fiber composite material, or insulating ceramic, in order to further reduce the overall weight of the fixture or enhance the overall insulation effect.

[0134] Alternatively, in some other embodiments, the support 130 is a metal component.

[0135] The support 130 is configured as a metal part, which utilizes the high mechanical strength, high elastic modulus and excellent resistance to deformation of the metal material itself. When the battery device 20 is clamped for testing, the support 130 can provide high-strength mechanical support for the heat insulation component 110 and the heat dissipation component 120, thereby effectively bearing the clamping force and mechanical stress applied from the outside, and preventing the clamping component 100 from bending, warping or structural failure under long-term high-pressure testing environment.

[0136] In some embodiments, the surface of the support member 130 may be subjected to surface treatment, such as oxidation treatment, anodizing treatment, electrophoresis treatment, spraying of anti-corrosion layer or nickel plating treatment, thereby improving the corrosion resistance, wear resistance and surface aesthetics of the support member 130.

[0137] In some possible implementations, the metal component includes at least one of aluminum, copper, nickel, nickel-plated copper, or silver.

[0138] When the metal component in the support member 130 is selected from at least one of aluminum, copper, nickel, nickel-plated copper, or silver, these specific metal materials all possess excellent mechanical strength, rigidity modulus, and structural stability. Among them, aluminum can significantly reduce structural weight while maintaining high strength, copper and silver have excellent physical stability and high fatigue strength, and nickel and nickel-plated copper have excellent oxidation resistance and corrosion resistance. Therefore, during the test when the test fixture 10 applies clamping force to the battery device 20, the support member 130 can effectively bear the external clamping stress without easily undergoing mechanical yielding or plastic deformation.

[0139] In this way, the support member 130 can provide a solid and reliable load-bearing base for the heat insulation member 110 connected thereto, which can ensure the structural rigidity of the clamping assembly 100 under long-term stress, thereby improving the overall durability, reliability and service life of the test fixture 10.

[0140] In some embodiments, the metal component of the support 130 may be a single aluminum component, copper component, nickel component, nickel-plated copper component, or silver component.

[0141] In other embodiments, the metal parts may also be alloy parts composed of elements such as aluminum, copper, nickel, and silver, such as aluminum alloy parts, copper alloy parts, or nickel alloy parts, thereby further balancing the lightweight requirements and high strength requirements of the support 130.

[0142] In addition, in some embodiments, the metal parts may also adopt a multi-layer metal composite plate structure, such as aluminum-copper composite plate or copper-nickel composite plate, so as to give full play to the mechanical and physical advantages of different metal materials.

[0143] In other embodiments, provided that mechanical strength is satisfied, the material of the metal parts can also be replaced with other high-strength metal materials such as stainless steel, titanium alloy or magnesium alloy, which can also provide stable mechanical support for the heat insulation component 110.

[0144] In some possible implementations, such as Figure 1 As shown, the support member 130 has a stepped portion 131, and the heat insulation member 110 is connected to the stepped portion 131.

[0145] The support member 130 has a stepped portion 131, and the heat insulation member 110 is connected to the stepped portion 131. During the testing of the battery device 20 by applying clamping force, the stepped portion 131 on the support member 130 can provide the heat insulation member 110 with a precise positioning space and a reliable physical support bearing surface, thereby preventing the heat insulation member 110 from misaligning or sliding when subjected to lateral compression or frequent clamping.

[0146] Meanwhile, the close fit between the stepped portion 131 and the heat insulation component 110 increases the contact and bonding area between the two, thereby significantly improving the connection strength and shear resistance between the support component 130 and the heat insulation component 110.

[0147] Furthermore, assembling the heat insulation component 110 at the stepped portion 131 makes the combined structure of the support component 130 and the heat insulation component 110 smoother and more compact, avoiding the occupation of additional clamping space. This arrangement not only enhances the reliability and structural stability of the connection between the support component 130 and the heat insulation component 110, but also achieves an efficient and compact design for the entire fixture.

[0148] In some embodiments, the step portion 131 can be a single-step structure or a multi-step structure to adapt to different structural forms or multi-layer composite thermal insulation components 110.

[0149] In some embodiments, the step portion 131 may be provided at the top edge, bottom edge or side edge of the support member 130, or it may be provided in a local recessed area of ​​the support member 130 near the tab 21.

[0150] In some embodiments, the cross-sectional profile of the step portion 131 can be L-shaped, rectangular, oblique, or arc-shaped, as long as it can fit with the heat insulation member 110 and provide support and positioning.

[0151] In some embodiments, the heat insulation member 110 and the stepped portion 131 can be fixedly connected by at least one of the following methods: snap-fit, threaded fastener connection, adhesive connection, and pin positioning connection.

[0152] In some embodiments, the heat insulation component 110 and the stepped portion 131 can also be integrated by an integrated molding process such as compression molding, hot pressing, secondary coating or 3D printing.

[0153] In some embodiments, the surface of the step portion 131 may also be provided with anti-slip texture, micro-rough surface, positioning protrusion or positioning groove to further enhance the friction or mechanical interlocking force between the step portion 131 and the heat insulation member 110.

[0154] In some possible implementations, such as Figure 1 As shown, the number of clamping components 100 is two or more, at least one clamping component 100 is used to be disposed on one side of the battery device 20, and the remaining clamping components 100 are used to be disposed on the other side of the battery device 20. At least one clamping component 100 and the remaining clamping components 100 are used to jointly clamp the battery device 20.

[0155] The test fixture 10 of the battery device 20 also includes a connecting assembly 200, which includes a connector 210 and an elastic member 220. The connector 210 includes a limiting section 211 and a connecting section 212. At least one clamping assembly 100 is fixedly connected to the connecting section 212, and the remaining clamping assemblies 100 are movably connected to the connecting section 212. The elastic member 220 is disposed between the limiting section 211 and the remaining clamping assemblies 100. For example, one, two, three, or four clamping assemblies 100 may be disposed on one side of the battery device 20 and fixedly connected to the connecting section 212. Alternatively, one, two, three, or four clamping assemblies 100 may be disposed on the other side of the battery device 20 and movably connected to the connecting section 212.

[0156] During charge and discharge testing, the battery device 20 typically expands and contracts in volume. In this embodiment, a connecting assembly 200 including a connector 210 and an elastic member 220 is provided. The connector 210 has a limiting section 211 and a connecting section 212. At least one clamping assembly 100 is fixedly connected to the connecting section 212, while the remaining clamping assemblies 100 are movably connected to the connecting section 212. The elastic member 220 is disposed between the limiting section 211 and the remaining clamping assemblies 100. With this configuration, when the battery device 20 expands in volume during charge and discharge, the expansion force generated by the battery device 20 acts on the movably connected clamping assembly 100, causing the movably connected clamping assembly 100 to move along the connecting section 212 towards the limiting section 211, thereby compressing the elastic member 220. The elastic member 220 undergoes elastic deformation after being compressed and absorbs the expansion displacement, while simultaneously applying a reverse clamping force to the clamping assembly 100.

[0157] In this way, the elastic element 220 can not only provide a stable clamping preload for the battery device 20, but also dynamically adapt to the volume expansion space requirements of the battery device 20 during the charging and discharging process. This avoids the problem of excessive stress or structural damage inside the battery device 20 caused by rigid restraint, thereby ensuring the structural safety of the battery device 20 and the accuracy and reliability of the test results throughout the entire testing process.

[0158] In some embodiments, the connector 210 can be a rod-shaped structure such as a double-ended stud, bolt, guide rod, tie rod, or smooth rod; wherein, the limiting section 211 of the connector 210 can be a bolt head, nut, boss, retaining ring, or positioning pin, and the connecting section 212 can be a smooth rod section, a threaded rod section, or a rod with a guide groove.

[0159] In some embodiments, the clamping assembly 100 and the connecting segment 212 can be fixedly connected by at least one of threaded connection, riveting, interference fit, snap-fit ​​connection or fastening connection with fasteners; thereby, the relative position of the clamping assembly 100 on the connecting member 210 can be fixed.

[0160] In some embodiments, the movable connection between the clamping assembly 100 and the connecting segment 212 can be a sliding fit, a sleeve fit, or a clearance fit; for example, a through hole or guide hole is provided on the clamping assembly 100, and the connecting segment 212 passes through the through hole or guide hole, so that the clamping assembly 100 can slide smoothly along the axial direction of the connecting segment 212, thereby realizing the movable connection with the connecting segment 212.

[0161] In some embodiments, the number of connecting components 200 can be one, two or more; wherein, when the number of connecting components 200 is more than one, the multiple connecting components 200 can be symmetrically or evenly arranged on the outer periphery of the clamping component 100, so that the clamping component 100 can be subjected to more uniform force when it is pressed and moved, thereby further ensuring the stability of the battery device 20 during the clamping process.

[0162] In some possible implementations, the elastic element 220 is a disc spring.

[0163] During the charge-discharge performance test of the battery device 20, thermal expansion and gas expansion occur inside the battery device 20 due to electrochemical reactions, causing its volume to dynamically expand and contract. When the elastic element 220 is specifically defined as a disc spring, due to the mechanical characteristics of the disc spring having minimal axial space occupation, high stiffness and high load-bearing capacity, when the battery device 20 expands in volume due to charging and discharging and pushes the clamping assembly 100 outward, the disc spring located between the limiting section 211 and the other clamping assemblies 100 can generate precise axial micro-elastic deformation, thereby effectively absorbing the volume expansion deformation of the battery device 20.

[0164] Meanwhile, the disc spring can maintain a relatively stable and continuous buffer spring output during deformation, preventing the clamping assembly 100 from applying excessive local compressive stress to the battery device 20, thereby avoiding damage to the internal cell structure or test failure of the battery device 20 due to excessive pressure, and also preventing poor contact caused by the loosening of clamping force when the battery device 20 shrinks in volume.

[0165] In some embodiments, the elastic element 220 can be a single disc spring or a disc spring assembly composed of multiple disc springs. The multiple disc springs can be combined in the same direction, opposite direction, or in a mixed manner, thereby flexibly adjusting the overall elasticity curve and axial deformation stroke of the elastic element 220 according to the expansion force and stroke requirements of different battery devices 20.

[0166] In other embodiments, in addition to disc springs, the elastic element 220 can be replaced with at least one of helical springs, wave springs, leaf springs, conical springs, rubber elastic pads, or polyurethane elastic elements 220, provided that elastic compensation and space requirements are met.

[0167] In a further embodiment, the number of connecting components 200 can be two, four or more, and the multiple connecting components 200 can be symmetrically distributed around or on the outer edge of the clamping component 100, thereby enabling the buffer clamping force applied by the elastic member 220 to act more evenly on the battery device 20.

[0168] The following are two specific embodiments and a comparative embodiment provided in this application:

[0169] Comparative Example 1:

[0170] The stainless steel clamp does not have a PEEK lining on the inside. The stainless steel clamp is made of SUS316L material, with a length of 300mm, a width of 140mm, and a thickness of 10mm.

[0171] Example 1:

[0172] The clamping assembly 100 of the test fixture 10 includes a heat insulation element 110 and a support element 130.

[0173] The parameters of support 130 are the same as those of the stainless steel clamp in Comparative Example 1. It is made of SUS316L material, with a length of 300mm, a width of 140mm, and a thickness of 10mm.

[0174] Meanwhile, the heat insulation component 110 inside the support 130 includes polyetheretherketone (PEEK) with a content of 30 wt%. The heat insulation component 110 is 300 mm long, 140 mm wide, and 6 mm thick. A strip of material 140 mm long, 3 mm wide, and 3 mm thick is removed from the upper and lower edges of the heat insulation component 110 near the support 130 to facilitate embedding into the stepped portion 131 of the support 130. The embedding method involves machining a groove inside the support 130 to form the stepped portion 131. Specifically, a groove is dug in the area between the inner sides of the two ends of the support 130, with a depth of 3 mm. The heat insulation component 110 is inserted into the groove by a pressing / sliding method, thereby achieving the connection between the support 130 and the heat insulation component 110. The advantages of this method are that it is detachable, replaceable, free of thermal stress, and highly safe. At the same time, this slotting method can not only conveniently embed the heat insulation component 110 into the support component 130, but also ensure that the test fixture 10 parts that the positive and negative electrode tabs 21 of the all-solid cell can contact are all made of highly insulating material (heat insulation component 110) to prevent short circuits.

[0175] Example 2:

[0176] like Figure 1 As shown, the clamping assembly 100 of the test fixture 10 includes a heat insulation component 110, a heat equalization component 120, and a support component 130.

[0177] The parameters of support 130 are the same as those of the stainless steel clamp in Comparative Example 1. It is made of SUS316L material, with a length of 300mm, a width of 140mm, and a thickness of 10mm.

[0178] Meanwhile, the parameters of the heat insulation component 110 and its connection method with the support component 130 are the same as in Embodiment 1.

[0179] Furthermore, the heat spreader 120 is a copper wire mesh with a square cross-section and a side length of 2 mm. The through-holes 121 of the copper wire mesh are hexagonal with a side length of 8.5 mm. On the tab 21 side, along the length of the heat insulation component 110, there is a gap of 5 mm between the heat spreader 120 and the tab 21 of the battery device 20. The holes on the clamping assembly 100 for connecting with the connector 210 are threaded holes with a diameter of 5 mm. The distance between the center of the threaded holes at the upper and lower ends of the clamping assembly 100 and the corresponding upper and lower ends is 8 mm, and the distance between the center of the threaded holes at the upper and lower ends of the clamping assembly 100 and the corresponding left and right ends is 12.5 mm.

[0180] Finally, the results of the cell capacity retention rate are shown in Table 1:

[0181] Table 1 - Comparison of Cell Capacity Retention Rate Results

[0182]

[0183] It should be understood that the embodiments of this application are not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A test fixture for a battery device, characterized in that, The device includes clamping assemblies for being disposed on opposite sides of the battery device, the clamping assemblies comprising: Thermal insulation component, the thermal insulation component comprising polyetheretherketone; A heat spreader is connected to the heat insulation component and is used to contact the battery device.

2. The test fixture for the battery device according to claim 1, characterized in that, The insulation component also includes reinforcing fibers.

3. The test fixture for the battery device according to claim 2, characterized in that, The reinforcing fibers include glass fibers and / or carbon fibers; And / or, the reinforcing fiber accounts for 0wt% to 50wt% of the mass of the insulation component.

4. The test fixture for the battery device according to any one of claims 1-3, characterized in that, The heat-spreading element has multiple through holes, and each through hole is arranged along the length direction and the width direction of the heat insulation element. And / or, the heat exchanger is a metal component.

5. The test fixture for the battery device according to claim 4, characterized in that, The heat-spreading element is a metal mesh, and at least a portion of the metal mesh is embedded inside the heat insulation element.

6. The test fixture for the battery device according to claim 4, characterized in that, The metal component includes at least one of aluminum, copper, nickel, nickel-plated copper, or silver.

7. The test fixture for the battery device according to any one of claims 1-3, characterized in that, The heat insulation component has a mounting groove, and at least a portion of the heat-spreading component is disposed inside the mounting groove; And / or, the heat-spreading component is connected to the heat insulation component by molding composite, hot pressing composite, 3D printing or secondary coating; And / or, in the longitudinal direction of the heat insulation member, there is a gap between the heat spreader and the tab of the battery device; And / or, the clamping assembly further includes a support member connected to the heat insulation member, the support member being located on the side of the heat insulation member away from the heat spreader, and the heat insulation member being disposed between the tab of the battery device and the support member to isolate the tab from the support member.

8. The test fixture for the battery device according to claim 7, characterized in that, The length of the interval is 1mm to 6mm; And / or, the support member is a metal component; And / or, the support member has a stepped portion, and the heat insulation member is connected to the stepped portion.

9. The test fixture for the battery device according to any one of claims 1-3, characterized in that, The number of clamping components is two or more, at least one of the clamping components is used to be disposed on one side of the battery device, and the remaining clamping components are used to be disposed on the other side of the battery device, and at least one clamping component and the remaining clamping components are used to jointly clamp the battery device; It also includes a connection component, the connection component comprising: A connector, comprising a limiting segment and a connecting segment, wherein at least one of the clamping components is fixedly connected to the connecting segment, and the remaining clamping components are movably connected to the connecting segment; An elastic element is disposed between the limiting segment and the remaining clamping components.

10. The test fixture for the battery device according to claim 9, characterized in that, The elastic element is a disc spring.

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