Solid-state battery testing device and battery production equipment

Abstract

The utility model provides a solid-state battery testing device and battery production equipment, and belongs to the technical field of batteries. The solid-state battery testing device comprises a clamping piece used for clamping a solid-state battery; and the at least one buffer part is used for abutting between the solid-state battery and the clamping part, the buffer part is constructed to be capable of being compressed, the change rate of the compression force generated by the buffer part in the first compression amount range along with the compression amount is larger than the change rate of the compression force generated by the buffer part in the second compression amount range along with the compression amount, and the first compression amount is smaller than the second compression amount. According to the solid-state battery device, the reliability of testing the solid-state battery can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a solid-state battery testing device and battery production equipment. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] A solid-state battery is a battery that uses solid electrodes and solid electrolytes. Since the contact between solid electrolyte particles in a solid-state battery has a great influence on the performance of the solid-state battery, during the solid-state battery testing process, the solid electrolyte needs to be placed in a test device and a suitable external pressure is applied to the solid electrolyte in the test device to maintain the contact between the solid electrolyte particles and ensure the normal performance of the battery, thereby testing and studying the electrochemical performance of the solid-state battery. Since the performance of a solid-state battery is very sensitive to the applied pressure, how to effectively control the pressure applied to the solid electrolyte is crucial to the reliability of the solid-state battery performance evaluation. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the background technology. To this end, one purpose of the present application is to provide a solid-state battery testing device and a battery production equipment to improve the reliability of testing solid-state batteries using the solid-state battery device.

[0005] An embodiment of the first aspect of the present application provides a solid-state battery testing device, including: a clamping member for clamping a solid-state battery; at least one buffer member for abutting between the solid-state battery and the clamping member, the buffer member being constructed to be compressible, the rate of change of compression force generated by the buffer member within a first compression range with the compression amount is greater than the rate of change of compression force generated within a second compression range with the compression amount, and the first compression amount is less than the second compression amount.

[0006] In the technical solution of the embodiment of the present application, the buffer can be compressed, that is, the buffer can be deformed to adapt to the surface shape of the solid-state battery when the surface of the solid-state battery is uneven, and then can transmit uniform pressure to the solid-state battery. The first compression amount is less than the second compression amount, so that when the buffer starts to compress, the rate of change of the compression force with the compression amount is large, and the buffer can efficiently transmit the force applied by the clamping member. After being compressed to the second compression amount, the rate of change of the compression force of the buffer with the compression amount decreases, that is, as the buffer continues to be compressed, the degree of change of the compression force of the buffer is small. In this way, during the test, it is only necessary to keep the buffer at the second compression amount. Even if the buffer is deformed during use, the degree of change of the compression force can be kept small, so that the change of the pressure transmitted by the clamping member to the solid-state battery through the buffer is small, and then the buffer can transmit a relatively constant and uniform pressure to the solid-state battery during the test, so that the reliability of the test results is high.

[0007] In some embodiments, the rate of change of the compression force generated by the buffer within the second compression range with the compression amount is less than or equal to 10%. Within this range, the rate of change of the compression force generated by the buffer within the second compression range is small, so that when the compression amount of the buffer changes within the second compression range, the change of the pressure transmitted by the clamping member to the solid-state battery through the buffer can be further reduced, thereby further improving the reliability of the test results of the solid-state battery.

[0008] In some embodiments, the buffer exhibits a quasi-zero stiffness characteristic within the second compression range. The quasi-zero stiffness characteristic means that within the second compression range, the compression force generated by the buffer is consistent, that is, within the second compression range, the compression force of the buffer does not change with the change of the compression amount. In this way, when the clamping member clamps the buffer and the solid-state battery so that the clamping member transmits pressure to the solid-state battery through the buffer, if the compression amount of the buffer is within the second compression range, even if the buffer is deformed during the test, the pressure transmitted to the solid-state battery can be kept unchanged, so that the clamping member can transmit a constant and uniform pressure to the solid-state battery through the buffer, greatly improving the reliability of the test results of the solid-state battery.

[0009] In some embodiments, the elastic modulus of the buffer is 10MPa~500MPa. Within this range, the elastic modulus of the buffer is not too large, so that the buffer can undergo relatively large deformation, so that the buffer can adapt to the surface shape of the solid-state battery and deform when the surface of the solid-state battery is uneven, thereby improving the uniformity of the pressure transmitted to the solid-state battery. In addition, within this range, the elastic modulus of the buffer is not too small, so that the buffer can withstand the large pressure applied by the clamping member without being easy to crack, so that the buffer has higher reliability.

[0010] In some embodiments, the buffer comprises a porous elastic material having a plurality of pores distributed therein. The porous elastic material has good elasticity, so that it can undergo a large deformation and transmit uniform pressure to the solid-state battery. In addition, the compression characteristics of the porous elastic material are manifested as having a long stress platform, in which the compression force of the porous elastic material remains almost constant during the compression deformation, thereby enabling the clamp to transmit uniform and constant pressure to the solid-state battery through the porous elastic material.

[0011] In some embodiments, the solid-state battery and the buffer are arranged along a first direction, and on a projection plane perpendicular to the first direction, the orthographic projection of the solid-state battery overlaps with the orthographic projection of at least part of the buffer. In this way, the buffer can cover the entire surface of the solid-state battery, and the clamp can transmit uniform pressure to the entire solid-state battery through the buffer, thereby further improving the reliability of the test results of the solid-state battery.

[0012] In some embodiments, at least one buffer is two, and the two buffers are respectively in contact with two opposite surfaces of the solid-state battery. That is, the two buffers transmit uniform pressure to the solid-state battery from two opposite surfaces of the solid-state battery, further improving the uniformity of the force on the solid-state battery.

[0013] In some embodiments, the clamp includes: a base; a first clamp; a second clamp, at least one buffer abutting between the first clamp and the solid-state battery, and / or between the second clamp and the solid-state battery; a plurality of guide posts, the plurality of guide posts are connected to the base, the first clamp and the second clamp are movably mounted on the plurality of guide posts in sequence, and can be close to each other to clamp the solid-state battery. The first clamp and the second clamp can move on the guide posts to adjust the distance between each other, and can apply different pressures to the solid-state battery to meet different testing requirements of the solid-state battery.

[0014] In some embodiments, the clamping member further includes: an adjusting member configured to adjust the spacing between the first clamping member and the second clamping member, so that the first clamping member and the second clamping member can clamp the buffer and the solid-state battery, and the compression amount of the buffer is within a second compression amount range. Through the adjusting member, the clamping force of the first clamping member and the second clamping member to clamp the solid-state battery and the buffer can be adjusted, and the compression amount of the buffer can be controlled within the second compression amount range, so that the clamping member can transmit a relatively constant pressure to the solid-state battery through the buffer, thereby improving the reliability of the test results of the solid-state battery.

[0015] In some embodiments, the solid-state battery testing device further includes: a pressure testing component, which is placed between the base and the first clamping member, and is used to detect the pressure transmitted by the clamping member to the solid-state battery. Through the pressure testing component, the pressure generated by the solid-state battery can be monitored in real time, so that the clamping force of the clamping member can be adjusted in real time based on the monitoring results, so that the pressure generated by the solid-state battery meets the test requirements, thereby improving the reliability of the test results of the solid-state battery.

[0016] An embodiment of the second aspect of the present application provides a battery production device, which includes the solid-state battery testing device in the above embodiment.

[0017] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0019] Figure 1 A schematic diagram of the structure of a solid-state battery in some embodiments of the present application;

[0020] Figure 2 A schematic diagram of the structure of a solid-state battery testing device according to some embodiments of the present application;

[0021] Figure 3 A stress-strain diagram showing the compression force of the buffer member according to some embodiments of the present application as a function of the compression amount;

[0022] Figure 4 A schematic diagram of the three-dimensional structure of a solid-state battery testing device according to some other embodiments of the present application;

[0023] Figure 5 This is a schematic diagram of the front structural view of a solid-state battery testing device according to some other embodiments of the present application.

[0024] Description of reference numerals:

[0025] A first clamping member 1011, a second clamping member 1012;

[0026] Solid-state battery 100, clamping member 101, buffer member 102, base 103, guide column 104, adjustment member 105, pressure testing member 106;

[0027] Main body 10, pole ear 11;

[0028] The first direction X. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0031] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0032] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0034] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0035] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0036] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0037] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0038] The electrolyte of a solid-state battery is solid. The density and structure of the solid electrolyte can bring more charged ions together, conduct a larger current, and increase the battery capacity. Solid electrolytes usually include multiple solid particles, and the contact performance between the solid particles has a great influence on the performance of the battery. For example, if the contact ability between the solid particles is weak, it will lead to low transmission kinetics of charged ions between the solid particles, thus affecting the battery performance.

[0039] It can be seen that since solid-state batteries do not have electrolytes, electrons and ions need to be transferred through contact between particles. If the pressure is not constant, the conductivity of ions or electrons is prone to fluctuations, which will cause fluctuations in the charging and discharging capacity of solid-state batteries and affect the electrical performance of solid-state batteries. In addition, the performance of solid-state batteries is very sensitive to the uniformity of pressure. Therefore, improving the force uniformity and stability of solid electrolytes is crucial to the reliability of the test results of solid-state battery performance tests.

[0040] Based on the above considerations, in order to improve the reliability of the test results of solid-state batteries, a solid-state battery testing device is designed, including: a clamping member for clamping the solid-state battery, and at least one buffer member for abutting between the solid-state battery and the clamping member, the buffer member being constructed to be able to be compressed, and the rate of change of the compression force generated by the buffer member within a first compression range is greater than the rate of change of the compression force generated within a second compression range, and the first compression amount is less than the second compression amount.

[0041] When the surface of the solid-state battery is uneven, the buffer component can deform to adapt to the surface shape of the solid-state battery, thereby being able to transmit uniform pressure to the solid-state battery.

[0042] The first compression amount is smaller than the second compression amount, so that when the buffer just starts to compress, the rate of change of the compression force is large, and the buffer can efficiently transmit the force applied by the clamp. After being compressed to the second compression amount, the rate of change of the compression force of the buffer decreases, that is, as the buffer continues to be compressed, the compression force of the buffer changes less. In this way, during the test, the buffer only needs to be maintained at the second compression amount. Even if the buffer is deformed during use, the change in compression force can be kept small, so that the change in pressure transmitted by the clamp to the solid-state battery through the buffer is small, and the buffer can transmit a relatively constant and uniform pressure to the solid-state battery during the test, so that the reliability of the test results is higher.

[0043] The solid-state battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. A power supply system comprising the solid-state battery disclosed in the present application can be used to form the electrical device, which is conducive to improving the stability of the power supply system and the battery life.

[0044] The embodiment of the present application provides an electric device using a solid-state battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0045] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a solid-state battery according to some embodiments of the present application.

[0046] The solid-state battery 100 includes a positive electrode sheet, a negative electrode sheet and a solid electrolyte. The solid electrolyte is located between the positive electrode sheet and the negative electrode sheet, and is used to form an ion channel between the positive electrode sheet and the negative electrode sheet to ensure the transfer and reaction of positive and negative ions. The material of the solid electrolyte may include oxides, phosphates, silicates, nitrides or sulfides. The positive electrode sheet, the negative electrode sheet and the solid electrolyte sandwiched between the positive electrode sheet and the negative electrode sheet are wound or stacked to form the solid-state battery 100. Figure 1 , the structure of the solid-state battery 100 is shown in which the positive electrode sheet, the negative electrode sheet and the solid electrolyte are stacked to form the solid-state battery 100. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body 10 of the solid-state battery 100, and the parts of the positive electrode sheet and the negative electrode sheet without active materials constitute the tabs 11. The tabs 11 can be located at one end of the main body or at both ends of the main body 10. The shape of the solid-state battery 100 can be a rectangular parallelepiped, a cylindrical shape, and the like.

[0047] refer to Figure 2 as well as Figure 3 , Figure 2 A schematic diagram of the structure of a solid-state battery testing device according to some embodiments of the present application; Figure 3 This is a stress-strain diagram showing the compression force of the buffer component according to some embodiments of the present application as a function of the compression amount.

[0048] An embodiment of the present application provides a solid-state battery testing device, including: a clamping member 101, used to clamp a solid-state battery 100; at least one buffer member 102, used to abut between the solid-state battery 100 and the clamping member 101, the buffer member 102 is constructed to be compressible, and the rate of change of the compression force generated by the buffer member 102 within a first compression range with the compression amount is greater than the rate of change of the compression force generated within a second compression range with the compression amount, and the first compression amount is less than the second compression amount.

[0049] The clamping member 101 applies pressure to the solid-state battery 100 by clamping, and the pressure applied to the solid-state battery 100 varies depending on the clamping force.

[0050] The buffer member 102 abuts between the clamp member 101 and the solid-state battery 100 , that is, the buffer member 102 is disposed on the force transmission path from the clamp member 101 to the solid-state battery 100 , and transmits the force applied by the clamp member 101 to the solid-state battery 100 .

[0051] It can be understood that, in the case where the surface of the solid-state battery 100 is uneven, if the clamping member 101 directly clamps the solid-state battery 100, the contact tightness between the raised portion of the surface of the solid-state battery 100 and the clamping member 101 is greater than the contact tightness between the recessed portion of the surface of the solid-state battery 100 and the clamping member 101, thereby making the pressure applied by the clamping member 101 to the raised portion of the surface of the solid-state battery 100 greater than the pressure applied to the recessed portion of the surface of the solid-state battery 100, which can easily cause the problem of uneven force on the solid-state battery 100.

[0052] In the embodiment of the present application, the buffer 102 can be compressed, that is, the buffer 102 has the ability to deform so as to adapt to the surface shape of the solid-state battery 100, so that both the raised and recessed parts of the surface of the solid-state battery 100 can fully contact the buffer 102, thereby making the pressure transmitted to the solid-state battery 100 through the buffer 102 more uniform.

[0053] The buffer 102 generates a compressive force when compressed, and the compressive force is equal to the pressure transmitted to the solid-state battery 100 by the buffer 102. Therefore, the rate of change of the compression rate generated by the buffer 102 in the first compression range is greater than the rate of change of the compressive force generated in the second compression range, which is equivalent to the rate of change of the pressure transmitted to the solid-state battery 100 by the buffer 102 in the first compression range is greater than the rate of change of the pressure transmitted to the solid-state battery 100 in the second compression range.

[0054] The first compression amount is a range value, the second compression amount is also a range value, and the first compression amount is less than the second compression amount means that the maximum value within the first compression amount range is less than or equal to the minimum value within the second compression amount range.

[0055] The rate of change of the compression force generated by the buffer 102 within the first compression range with the compression amount is: the ratio of the change of the compression force generated by the buffer 102 within the first compression range to the compression amount of the buffer 102 within the first compression range.

[0056] For example, Figure 3 As shown, if the first compression range is 0~X1, within the first compression range, the compression force generated by the buffer 102 varies between the first compression force and the second compression force, then the rate of change of the compression force generated by the buffer 102 within the first compression range with the compression amount is: second compression force-first compression force / X1-0.

[0057] The rate of change of the compression force generated by the buffer 102 within the second compression range with the compression amount is: the ratio of the change of the compression force generated by the buffer 102 within the second compression range to the compression amount of the buffer 102 within the second compression range.

[0058] For example, Figure 3 As shown, if the second compression range is X1~X2, and within the first compression range, the compression force generated by the buffer 102 varies between the third compression force and the fourth compression force, then the rate of change of the compression force generated by the buffer 102 within the second compression range with the compression amount is: fourth compression force-third compression force / X2-X1.

[0059] If the compression amount of the buffer 102 within the first compression amount range is recorded as the first compression stage, and the compression amount of the buffer 102 within the second compression amount range is recorded as the second compression stage, then the second compression stage is the stage after the buffer 102 undergoes the first compression stage.

[0060] In some embodiments, the buffer 102 may enter the second compression stage immediately after the first compression stage, that is, the maximum value in the first compression range is equal to the minimum value in the second compression range. For example, the first compression range may be 0 mm to 4 mm, and the second compression range may be 4 mm to 6 mm.

[0061] In other embodiments, the buffer 102 does not immediately enter the second compression stage after the first compression stage, that is, the maximum value in the first compression range is less than the minimum value in the second compression range. For example, there is a third compression stage between the first compression stage and the second compression stage, and the compression amount in the third compression stage is greater than the first compression amount and less than the second compression amount. The buffer 102 enters the third compression stage after the first compression stage, and immediately enters the second compression stage after the third compression stage.

[0062] Exemplarily, the rate of change of the compression force of the buffer 102 in the third compression stage may be greater than the rate of change of the compression force in the first compression stage, or may be equal to or less than the rate of change of the compression force in the first compression stage.

[0063] Understandably, Figure 3 Only one case between the first compression amount and the second compression amount is shown, that is, the minimum value in the first compression amount range is 0, and the maximum value in the first compression amount range is equal to the minimum value in the second compression amount range. In other examples, the minimum value in the first compression amount range may not be 0, that is, the first compression amount is not the initial compression stage of the buffer. The maximum value in the first compression amount range may also be less than the minimum value in the second compression amount range, that is, there are other compression stages between the first compression amount and the second compression amount.

[0064] The curve of the compression force of the buffer 102 changing with the compression amount in the first compression stage can be a linear curve, and the curve of the compression force of the buffer 102 changing with the compression amount in the second compression stage can also be a linear curve, that is, in the first compression stage, the compression force of the buffer 102 increases with the increase of the compression amount, and in the second compression stage, the compression force of the buffer 102 increases with the increase of the compression amount.

[0065] The curve of the compression force of the buffer 102 changing with the compression amount in the first compression stage may also be nonlinear, and the curve of the compression force of the buffer 102 changing with the compression amount in the second compression stage may also be nonlinear.

[0066] From the above, it can be seen that the rate of change of the compression force of the buffer 102 with the compression amount can be obtained by detecting the compression force of the buffer 102 and the compression amount of the buffer 102, obtaining the stress-strain curve of the compression force of the buffer 102 with the compression amount, and calculating the above rate of change based on the stress-strain curve.

[0067] In some embodiments, a compression test method can be used to obtain a stress-strain curve of the buffer 102. For example, the buffer 102 is placed in a press, a certain pressure is applied, and the compression amount and compression force of the buffer 102 are measured to obtain a stress-strain curve.

[0068] In the above technical solution, the buffer 102 can be compressed. When the surface of the solid-state battery 100 is uneven, the buffer 102 can deform to adapt to the surface shape of the solid-state battery 100, thereby transmitting uniform pressure to the solid-state battery 100.

[0069] It is understandable that due to the deformation ability of the buffer 102, uniform stress is applied to the solid-state battery 100. However, the long-term stress change inside the buffer 102 may cause fatigue damage to the buffer 102, resulting in the deformation of the buffer 102 when the pressure applied to the buffer 102 by the clamp 101 remains unchanged. The deformation of the buffer 102, that is, the change in the compression amount of the buffer 102, causes the compression force generated by the buffer 102 to change accordingly, and thus causes the pressure transmitted to the solid-state battery 100 via the buffer 102 to change, which may cause the problem of a large change in the stress of the solid-state battery 100 during the testing of the solid-state battery 100.

[0070] Based on the above considerations, in the embodiment of the present application, the rate of change of the compression force generated by the selected buffer 102 with the compression amount within the first compression amount range is greater than the rate of change of the compression force generated by the second compression amount range with the compression amount. That is to say, when the buffer 102 begins to compress, the rate of change of the compression force with the compression amount is large, and the buffer 102 can efficiently transmit the force applied by the clamp 101. After being compressed to the second compression amount, the rate of change of the compression force of the buffer 102 with the compression amount decreases, that is, as the buffer 102 continues to be compressed, the degree of change of the compression force of the buffer 102 is small. In this way, during the test process, it is only necessary to keep the buffer 102 at the second compression amount. Even if the buffer 102 is deformed during use, the degree of change of the compression force can be kept small, so that the change of the pressure transmitted by the clamp 101 to the solid-state battery 100 through the buffer 102 is small, and then the buffer 102 can transmit a relatively constant and uniform pressure to the solid-state battery 100 during the test process, so that the reliability of the test result is high.

[0071] According to some embodiments of the present application, the rate of change of the compression force generated by the buffer member 102 within the second compression range with the compression amount is less than or equal to 10%.

[0072] In other words, the ratio of the change in the compressive force generated by the buffer 102 within the second compression range to the compression amount of the buffer 102 within the second compression range is less than or equal to 10%.

[0073] Exemplarily, the change rate of the compression force generated by the buffer member 102 within the second compression range may be 0% to 5% or 5% to 10%.

[0074] The rate of change of the compression force generated by the buffer member 102 within the first compression range with the compression amount is greater than 10%.

[0075] Within the above range, the compression force generated by the buffer 102 within the second compression range has a smaller rate of change with the compression amount, so that when the compression amount of the buffer 102 changes within the second compression range, the change in pressure transmitted by the clamping member 101 to the solid-state battery 100 through the buffer 102 can be further reduced, thereby further improving the reliability of the test results of the solid-state battery 100.

[0076] According to some embodiments of the present application, the buffer 102 exhibits a quasi-zero stiffness characteristic within the second compression range.

[0077] The quasi-zero stiffness characteristic means that within the second compression range, the compression force generated by the buffer 102 remains unchanged or is nearly unchanged, that is, within the second compression range, the rate of change of the compression force generated by the buffer 102 is 0 or close to 0 as the compression changes.

[0078] It can be understood that the buffer 102 does not have a quasi-zero stiffness characteristic within the first compression range, so that the compression force of the buffer 102 is more sensitive to changes in the compression amount, so that the clamping member 101 can efficiently transfer pressure to the solid-state battery 100 via the buffer 102.

[0079] In the above technical solution, when the clamping member 101 clamps the buffer member 102 and the solid-state battery 100 so that the clamping member 101 transmits pressure to the solid-state battery 100 through the buffer member 102, the compression amount of the buffer member 102 can be maintained within the second compression amount range. In this way, even if the buffer member 102 is deformed during the test, the compression force of the buffer member 102 can be kept unchanged, and then a constant and uniform pressure can be transmitted to the solid-state battery 100, thereby greatly improving the reliability of the test results of the solid-state battery 100.

[0080] According to some embodiments of the present application, the elastic modulus of the buffer 102 is 10 MPa-500 MPa.

[0081] The elastic modulus is a parameter describing the elastic performance of the buffer 102, and is used to measure the degree of elastic deformation of the buffer 102 under stress. The elastic modulus refers to the stress of the buffer 102 divided by the strain in the direction when the buffer 102 is under unidirectional stress.

[0082] In some embodiments, the elastic modulus of the buffer 102 can be measured by a compression test method. For example, pressure is applied to the buffer 102 to cause compressive deformation, a stress-strain curve is measured, and the elastic modulus is calculated based on the slope of the restricted area in the stress-strain curve.

[0083] Within this range, the elastic modulus of the buffer 102 is not too large, so that the buffer 102 can undergo relatively large deformation, so that the buffer 102 can adapt to the surface shape of the solid-state battery 100 and deform when the surface of the solid-state battery 100 is uneven, thereby improving the uniformity of the pressure transmitted to the solid-state battery 100. In addition, within this range, the elastic modulus of the buffer 102 is not too small, so that the buffer 102 can withstand the large pressure applied by the clamp 101 without being easily cracked, so that the buffer 102 has higher reliability.

[0084] According to some embodiments of the present application, the buffer 102 includes a porous elastic material, and a plurality of pores are distributed in the porous elastic material.

[0085] A porous elastic material is a material with pores or a sponge-like structure. The compression characteristics of a porous elastic material are characterized by a long stress platform, in which the compression force of the porous elastic material remains almost constant during the compression deformation.

[0086] In some embodiments, some of the multiple pores inside the porous elastic material may be interconnected to form a network structure, and the remaining pores may be in a closed hole structure.

[0087] In other embodiments, the multiple pores inside the porous elastic material may all be interconnected, or all be in a closed hole structure.

[0088] Since there are multiple pores distributed inside, the porous elastic material has good elasticity, so it can transmit uniform pressure to the solid-state battery 100.

[0089] In some embodiments, the porous elastic material may include but is not limited to sponge, rubber or resin, etc. Exemplarily, the porous elastic material may be foamed rubber.

[0090] It is understandable that, in other embodiments, the buffer 102 may also be any other material that satisfies the requirement that the rate of change of the compression force generated within the first compression range with the compression amount is greater than the rate of change of the compression force generated within the second compression range with the compression amount.

[0091] In the above technical solution, the porous elastic material has good elasticity, so that it can undergo large deformation and transmit uniform pressure to the solid-state battery 100. In addition, since the compression characteristics of the porous elastic material are manifested as having a long stress platform, in this stress platform, the compression force of the porous elastic material remains almost constant during the compression deformation, thereby enabling the clamping member 101 to transmit uniform and constant pressure to the solid-state battery 100 through the porous elastic material.

[0092] refer to Figure 4 as well as Figure 5 , Figure 4 A schematic diagram of the three-dimensional structure of a solid-state battery testing device according to some other embodiments of the present application; Figure 5 This is a schematic diagram of the front structural view of a solid-state battery testing device according to some other embodiments of the present application.

[0093] According to some embodiments of the present application, the solid-state battery 100 and the buffer 102 are arranged along a first direction X, and on a projection plane perpendicular to the first direction X, the orthographic projection of the solid-state battery 100 coincides with the orthographic projection of at least part of the buffer 102 .

[0094] On the projection plane perpendicular to the first direction X, the orthographic projection of the solid-state battery 100 may completely overlap with the orthographic projection of the buffer 102, that is, the buffer 102 covers the surface of the solid-state battery 100 along the first direction X. Alternatively, the orthographic projection of the solid-state battery 100 may also overlap with the orthographic projection of part of the buffer 102. That is, the area of ​​the buffer 102 perpendicular to the first direction X is greater than the area of ​​the solid-state battery 100 perpendicular to the first direction X, so that only part of the buffer 102 can cover the entire surface of the solid-state battery 100.

[0095] In the above technical solution, the buffer member 102 can cover the entire surface of the solid-state battery 100, so that the clamping member 101 can transmit uniform pressure to the entire solid-state battery 100 through the buffer member 102, thereby further improving the reliability of the test results of the solid-state battery 100.

[0096] According to some embodiments of the present application, there are two at least one buffer member 102 , and the two buffer members 102 are respectively in contact with two opposite surfaces of the solid-state battery 100 .

[0097] The two buffer members 102 have the same compression characteristics, that is, the compression force generated by each buffer member 102 within the first compression range has the same rate of change compared to the compression amount, and the compression force generated by each buffer member 102 within the second compression range has the same rate of change compared to the compression amount. In this way, each buffer member 102 transmits the same pressure to the two opposite surfaces of the solid-state battery 100.

[0098] It is understandable that, in other embodiments, the at least one buffer member 102 may also be one, and the buffer member 102 abuts between one of the surfaces of the solid-state battery 100 and the clamping member 101 .

[0099] In the above technical solution, the two buffer members 102 transmit uniform pressure to the solid-state battery 100 from two opposite surfaces of the solid-state battery 100 , respectively, to further improve the uniformity of the force applied to the solid-state battery 100 .

[0100] refer to Figure 4 as well as Figure 5 According to some embodiments of the present application, the clamping member 101 includes: a base 103; a first clamping member 1011; a second clamping member 1012, at least one buffer member 102 abuts between the first clamping member 1011 and the solid-state battery 100, and / or between the second clamping member 1012 and the solid-state battery 100; a plurality of guide columns 104, the plurality of guide columns 104 are connected to the base 103, the first clamping member 1011 and the second clamping member 1012 are movably mounted on the plurality of guide columns 104 in sequence, and can be close to each other to clamp the solid-state battery 100.

[0101] That is to say, the first clamping member 1011 is disposed closer to the base 103 than the second clamping member 1012 .

[0102] The guide column 104 may have a first end and a second end opposite to each other, the first end of the guide column 104 may be fixed to the base 103, and the second end of the guide column 104 extends out of the second clamping member 1012. The first clamping member 1011 may have a plurality of first mounting holes penetrating the first clamping member 1011 along the thickness direction, and the second clamping member 1012 may have a plurality of second mounting holes penetrating the second clamping member 1012 along the thickness direction. The first clamping member 1011 and the second clamping member 1012 may be slidably mounted on the guide column 104 through the first mounting holes and the second mounting holes, respectively.

[0103] The plurality of guide posts 104 may pass through the outer regions of the first clamp 1011 and the second clamp 1012 and be distributed in a ring shape, and the buffer 102 and the solid-state battery 100 may be located in a space surrounded by the plurality of guide posts 104 .

[0104] In some embodiments, the base 103 may be a plate-like structure.

[0105] In some embodiments, the first clamp 1011, the second clamp 1012 and the base 103 may be made of metal, such as alloy materials such as steel. In one example, the first clamp 1011, the second clamp 1012 and the base 103 may all be steel plates.

[0106] There are many ways for the first clamping member 1011 and the second clamping member 1012 to clamp the solid-state battery 100. For example, pressure can be manually applied to the first clamping member 1011 so that the first clamping member 1011 and the second clamping member 1012 clamp the solid-state battery 100. Alternatively, a nut can be used, which is sleeved on the second end of the guide column 104 and tightened to clamp the first clamping member 1011 and the second clamping member 1012 to clamp the solid-state battery 100.

[0107] In the above technical solution, the first clamp 1011 and the second clamp 1012 can move on the guide column 104 to adjust the distance between each other, and then can apply different pressures to the solid-state battery 100 to adapt to different testing requirements of the solid-state battery 100.

[0108] It is understandable that in the above technical solution, the first clamping member 1011 and the second clamping member 1012 are two independent components. In other embodiments, one end of the first clamping member 1011 and one end of the second clamping member 1012 can also be connected by a hinge to form a clamp-like structure.

[0109] In other embodiments, the structure of the clamping member 101 may also be other structures capable of clamping the solid-state battery 100 besides the above-mentioned structures.

[0110] refer to Figure 5 According to some embodiments of the present application, the clamping member 101 also includes: an adjusting member 105, which is configured to adjust the distance between the first clamping member 1011 and the second clamping member 1012, so that the first clamping member 1011 and the second clamping member 1012 can clamp the buffer member 102 and the solid-state battery 100, and the compression amount of the buffer member 102 is within a second compression amount range.

[0111] The adjusting member 105 can move the first clamping member 1011 and the second clamping member 1012 closer to each other to clamp the buffer member 102 and the solid-state battery 100 , and can also move the first clamping member 1011 and the second clamping member 1012 away from each other to loosen the solid-state battery 100 .

[0112] In some embodiments, the guide column 104 has an external thread, the adjusting member 105 has an assembly hole, the inner wall surface of the assembly hole has an internal thread matching the external thread, and the adjusting member 105 is sleeved on the second end of the guide column 104 through the assembly hole, so that the adjusting member 105 can be screwed into the guide column 104, thereby realizing a fixed connection between the guide column 104 and the adjusting member 105, and realizing the distance adjustment between the first clamping member 1011 and the second clamping member 1012.

[0113] The adjusting member 105 is inserted into the guide column 104 from the second end of the guide column 104. When the solid-state battery 100 needs to be clamped, the adjusting member 105 is screwed in the direction from the second end of the guide column 104 to the first end, so that the first clamping member 1011 and the second clamping member 1012 gradually approach each other. Moreover, after the first clamping member 1011 and the second clamping member 1012 clamp the solid-state battery 100, as the adjusting member 105 continues to be screwed in, the force applied to the solid-state battery 100 by the first clamping member 1011 and the second clamping member 1012 becomes greater and greater. When the pressure required by the solid-state battery 100 is reached, the adjusting member 105 is stopped from being screwed in, so that the locking member can be fixed at the current position.

[0114] Exemplarily, the adjusting member 105 may include but is not limited to structures such as a nut.

[0115] In some embodiments, in order to accurately control the degree of screwing of the nut so that the first clamping member 1011 and the second clamping member 1012 apply the required clamping force to the buffer 102 and the solid-state battery 100, and the compression amount of the buffer 102 is within the second compression amount range, the nut can be tightened by a torque wrench, and the torque applied to the nut can be accurately controlled, thereby controlling the clamping force applied to the buffer 102 and the solid-state battery 100.

[0116] In other embodiments, the adjusting member 105 may also be a pressure block with a certain deadweight, which is pressed on the side of the second clamping member 1012 away from the first clamping member 1011, so that the first clamping member 1011 and the second clamping member 1012 clamp the buffer member 102 and the solid-state battery 100, and apply the required clamping force to the buffer member 102 and the solid-state battery 100.

[0117] In the above technical solution, the clamping force of the first clamping member 1011 and the second clamping member 1012 to clamp the solid-state battery 100 and the buffer member 102 can be adjusted through the adjusting member 105, and the compression amount of the buffer member 102 can be controlled within the second compression amount range, so that the clamping member 101 can transmit a relatively constant pressure to the solid-state battery 100 through the buffer member 102, thereby improving the reliability of the test results of the solid-state battery 100.

[0118] refer to Figure 4 as well as Figure 5 According to some embodiments of the present application, the solid-state battery testing device further includes: a pressure testing component 106 , disposed between the base 103 and the first clamp 1011 , for detecting the pressure transmitted by the clamp 101 to the solid-state battery 100 .

[0119] It can be understood that since the first clamping member 1011 and the second clamping member 1012 are movably mounted on the guide column 104, the first clamping member 1011 will move relative to the base 103 until the first clamping member 1011 abuts against the pressure testing component 106 on the base 103. In this way, the pressure transmitted to the solid-state battery 100 will be transmitted to the pressure testing component 106, so that the pressure testing component 106 is also a link in the step of transmitting pressure to the solid-state battery 100, so that the pressure testing component 106 can detect the size of the pressure transmitted to the solid-state battery 100 in real time. When the pressure detected by the pressure testing component 106 meets expectations, the adjustment of the distance between the first clamping member 1011 and the second clamping member 1012 can be stopped.

[0120] In some embodiments, the pressure testing component 106 may be any device having a pressure detection function, such as a pressure sensor. The pressure testing component 106 may be fixedly mounted on the base 103 by bonding or the like.

[0121] In the above technical solution, the pressure generated by the solid-state battery 100 can be monitored in real time through the pressure testing component 106, so that the clamping force of the clamp 101 can be adjusted in real time based on the monitoring results, so that the pressure generated by the solid-state battery 100 meets the test requirements, thereby improving the reliability of the test results of the solid-state battery 100.

[0122] An embodiment of the present application provides a battery production device, which includes the solid-state battery testing device in the above embodiment.

[0123] The battery production equipment can be used for the production of solid-state batteries. For the structure of the solid-state batteries, reference can be made to the relevant description of the above embodiments.

[0124] After the solid-state battery is prepared, the solid-state battery testing device of the above embodiment can be used to test the solid-state battery to evaluate the performance of the solid-state battery.

[0125] Since the solid-state battery testing device of the above embodiment can improve the reliability of testing the solid-state battery, the performance of the solid-state battery can be accurately evaluated and the production yield of the solid-state battery can be improved.

[0126] The present application embodiment provides a solid-state battery testing device, referring to Figures 3 to 5 The solid-state battery testing device includes: a first clamping member 1011 and a second clamping member 1012, the first clamping member 1011 and the second clamping member 1012 are used to clamp the solid-state battery 100; two buffer members 102, which are respectively used to abut between the solid-state battery 100 and the first clamping member 1011 and between the solid-state battery 100 and the second clamping member 1012, the buffer member 102 is constructed to be able to be compressed, and the rate of change of the compression force generated by the buffer member 102 with the compression amount within the first compression amount range is greater than the rate of change of the compression force generated by the buffer member 102 with the compression amount within the second compression amount range, and the first compression amount is less than the second compression amount.

[0127] The rate of change of the compression force generated by the buffer 102 within the second compression range with the compression amount may be less than or equal to 10%. Exemplarily, the buffer 102 exhibits a quasi-zero stiffness characteristic within the second compression range.

[0128] The elastic modulus of the buffer member 102 is 10 MPa to 500 MPa.

[0129] The buffer 102 includes a porous elastic material, and a plurality of pores are distributed in the porous elastic material. The porous elastic material may include but is not limited to sponge, rubber or resin, etc. For example, the porous elastic material may be foam rubber.

[0130] The solid-state battery testing device also includes: a base 103; a plurality of guide columns 104, the plurality of guide columns 104 are connected to the base 103, the first clamping member 1011 and the second clamping member 1012 are movably mounted on the plurality of guide columns 104 in sequence, and can be close to each other to clamp the solid-state battery 100.

[0131] The clamping member 101 further includes: an adjusting member 105, which is configured to adjust the distance between the first clamping member 1011 and the second clamping member 1012, so that the first clamping member 1011 and the second clamping member 1012 can clamp the buffer 102 and the solid-state battery 100, and the compression amount of the buffer 102 is within the second compression amount range. The adjusting member 105 may include but is not limited to a nut, which is connected to the guide rod.

[0132] The solid-state battery testing device further includes: a pressure testing component 106 , which is disposed between the base 103 and the first clamping member 1011 and is used to detect the pressure transmitted from the clamping member 101 to the solid-state battery 100 .

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A solid-state battery testing device, characterized in that: include: A clamping member, used for clamping a solid-state battery; At least one buffer member is used to abut between the solid-state battery and the clamping member, the buffer member is constructed to be compressible, the rate of change of the compression force generated by the buffer member within a first compression range with the compression amount is greater than the rate of change of the compression force generated within a second compression range with the compression amount, and the first compression amount is less than the second compression amount.

2. The solid-state battery testing device according to claim 1, characterized in that: The rate of change of the compression force generated by the buffer member within the second compression range with the compression amount is less than or equal to 10%.

3. The solid-state battery testing device according to claim 2, characterized in that: The buffer member exhibits a quasi-zero stiffness characteristic within the second compression range.

4. The solid-state battery testing device according to claim 1, characterized in that: The elastic modulus of the buffer component is 10MPa~500MPa.

5. The solid-state battery testing device according to any one of claims 1 to 4, characterized in that: The buffer component comprises a porous elastic material, and a plurality of pores are distributed in the porous elastic material.

6. The solid-state battery testing device according to any one of claims 1 to 4, characterized in that: The solid-state battery and the buffer are arranged along a first direction, and on a projection plane perpendicular to the first direction, an orthographic projection of the solid-state battery coincides with an orthographic projection of at least part of the buffer.

7. The solid-state battery testing device according to any one of claims 1 to 4, characterized in that: There are two of the at least one buffer member, and the two buffer members are respectively in contact with two opposite surfaces of the solid-state battery.

8. The solid-state battery testing device according to any one of claims 1 to 4, characterized in that: The clamping member comprises: Base; a first clamping member; a second clamping member, wherein the at least one buffer member is abutted between the first clamping member and the solid-state battery, and / or between the second clamping member and the solid-state battery; A plurality of guide posts are connected to the base, the first clamping member and the second clamping member are movably mounted on the plurality of guide posts in sequence, and can be brought close to each other to clamp the solid-state battery.

9. The solid-state battery testing device according to claim 8, characterized in that: The clamping member also includes: An adjusting member is configured to adjust the distance between the first clamping member and the second clamping member so that the first clamping member and the second clamping member can clamp the buffer member and the solid-state battery, and the compression amount of the buffer member is within the second compression amount range.

10. The solid-state battery testing device according to claim 8, characterized in that: The solid-state battery testing device also includes: A pressure testing component is placed between the base and the first clamping member, and is used to detect the pressure transmitted by the clamping member to the solid-state battery.

11. A battery production device, characterized in that: A solid-state battery testing device comprising any one of claims 1-10.

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