Solid-state battery negative electrode material detection device and method

Abstract

The application discloses a kind of solid-state battery negative electrode material detection device and method, belong to negative electrode material detection technical field, including: support mechanism, be located on the support mechanism on deflection mechanism, with the detection mechanism being connected with the deflection mechanism, and with the detection mechanism being connected with adjusting assembly;The deflection mechanism is used to adjust the angle of detection mechanism, including: limit slide, with the support shaft being connected with the limit slide, with the pry frame being connected with the support shaft, and with the telescopic assembly and support cylinder being connected with the pry frame;Arc-shaped slide is equipped on the limit slide, and one end of the support shaft is slidably connected with the arc-shaped slide.The application can select detection mode according to the conveying speed of conveying roller, simultaneously realize seamless switching, can also ensure that detection data still meets process precision requirement under sub-health state, improve the comprehensive efficiency of detection device and production line continuous operation ability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of negative electrode material detection, and particularly relates to a solid-state battery negative electrode material detection device and method. BACKGROUND

[0002] With the continuous improvement of the energy density and safety requirements of lithium ion batteries, the surface quality control of the negative electrode material coating and rolling process has become a key link restricting the consistency and yield of the batteries.

[0003] In the prior art, negative electrode material surface defect detection mainly relies on optical detection (such as linear CCD and laser scanning) and contact tension monitoring. However, under the harsh working conditions of high temperature, dust and vibration in the drying section and high-speed rolling section after coating, the optical lens is easily contaminated and fails, and the pressure sensor needs to be frequently stopped and calibrated due to mechanical wear, which significantly affects the overall efficiency of the equipment.

[0004] In recent years, contact sensing technology based on strain gauge detection carriers has been gradually applied to the field of material online monitoring. This type of technology attaches strain gauges to the surface of an elastic detection beam, and through the forced bending deformation of the beam body caused by the ups and downs of the material surface topography, the geometric change is converted into a strain-voltage signal, which can realize synchronous detection of topography and stress. However, in actual industrial applications, the detection carrier exposed to continuous alternating loads for a long time will inevitably face health degradation problems such as stiffness attenuation, fatigue creep and installation posture deviation. Traditional technology uses fixed transfer coefficients for strain-tension conversion, and does not establish a dynamic compensation mechanism for the health status of the carrier, resulting in a sharp decline in detection accuracy during the "sick operation" stage, an increase in false positive rate and false negative rate, and ultimately the need for early maintenance, which cannot be continuously operated. SUMMARY

[0005] To solve the above problems, the first aspect of the present application provides a solid-state battery negative electrode material detection device, comprising: a support mechanism, a deflection mechanism provided on the support mechanism, a detection mechanism connected with the deflection mechanism, and an adjusting assembly connected with the detection mechanism.

[0006] The deflection mechanism is used to adjust the angle of the detection mechanism, and comprises: a limiting slide, a support shaft connected with the limiting slide, a pry frame connected with the support shaft, and a telescopic assembly and a support cylinder connected with the pry frame.

[0007] An arc-shaped slide is arranged on the limiting slide, and one end of the support shaft is in sliding connection with the arc-shaped slide.

[0008] Preferably, the support mechanism comprises a support frame, and a conveying roller is arranged on the support frame.

[0009] One end of the pry frame is connected with a support shaft, the middle part is hingedly connected with a support frame, and the other end is connected with the telescopic assembly;

[0010] The output end of the telescopic assembly is connected with the pry frame.

[0011] The detection mechanism comprises a detection carrier, a first strain gauge and a second strain gauge arranged on the detection carrier.

[0012] Preferably, the detection carrier comprises a connecting part, a flat part connected with the connecting part, an arc-shaped part connected with the flat part, and a chamfered part connected with the arc-shaped part.

[0013] The connecting part is connected with the support shaft.

[0014] The flat part is a straight plate structure for carrying the first strain gauge, and the arc-shaped part is an arc-shaped plate structure for carrying the second strain gauge.

[0015] The detection carrier is matched with the limiting slide rail, and the outer edge abutting surface of the arc-shaped part is tangent to the detection surface of the strip-shaped negative electrode material.

[0016] Preferably, the detection mechanism further comprises a connecting seat connected with the detection carrier, and an electromagnet arranged on the connecting seat.

[0017] In one group of detection carriers, three carrying pieces are arranged, the three carrying pieces are the same in structure, and the flat parts and the arc-shaped parts of the three carrying pieces are not connected.

[0018] The detection carrier further comprises a cutting bifurcated plate and a strain cutting groove arranged at the connecting part and the flat part.

[0019] In one group of detection carriers, only the cutting bifurcated plates are arranged on the carrying pieces at both sides, and the cutting bifurcated plates are matched with the electromagnet.

[0020] The second aspect of the present application provides a solid-state battery negative electrode material detection method based on the solid-state battery negative electrode material detection device.

[0021] A mechanical equation is constructed based on the structure of the detection carrier.

[0022] Initial parameters of the detection carrier are calibrated.

[0023] Actual parameters of the detection carrier are detected.

[0024] A set of health parameters of the detection carrier is determined based on the initial parameters of the detection carrier and the actual parameters of the detection carrier.

[0025] determining the detection carrier health state based on the detection carrier health parameter set, the first health parameter threshold set, and the second health parameter threshold set;

[0026] in response to the detection carrier being in a sub-health state, determining a strain compensation value based on the initial force transmission coefficient and the actual force transmission coefficient;

[0027] determining a detection value based on the strain value;

[0028] determining a negative electrode material surface morphology based on the detection value.

[0029] Preferably, the detection carrier initial parameter calibration comprises:

[0030] applying a step magnetic force by an electromagnet and collecting initial strain data;

[0031] determining the initial force transmission coefficient based on the initial strain data.

[0032] Preferably, the detection carrier actual parameter detection comprises:

[0033] applying a magnetic force by an electromagnet and collecting actual strain data;

[0034] determining the actual force transmission coefficient based on the actual strain data.

[0035] Preferably, the determination of the detection carrier health state comprises:

[0036] determining the overall health state of the detection carrier based on the state of each health parameter in the detection carrier health parameter set;

[0037] wherein the determination of the overall health state of the detection carrier based on the state of each health parameter in the detection carrier health parameter set comprises:

[0038] if all parameters in the detection carrier health parameter set are less than the corresponding parameter threshold in the first health parameter threshold set, the detection carrier is determined to be in a normal state;

[0039] if at least one parameter in the detection carrier health parameter set is greater than or equal to the first health parameter threshold set, and all parameters are less than the corresponding parameter threshold in the second health parameter threshold set, the detection carrier is determined to be in a sub-health state;

[0040] if at least one parameter in the detection carrier health parameter set is greater than or equal to the corresponding parameter threshold in the second health parameter threshold set, the detection carrier is determined to be in a shutdown for inspection state.

[0041] Preferably, the determination of the strain compensation value based on the actual force transmission coefficient is:

[0042] ;

[0043] wherein, a strain compensation value, is a strain measurement value, is an initial force transmission coefficient, is an actual force transmission coefficient.

[0044] Preferably, the detection value is calculated in the following manner:

[0045] ;

[0046] ;

[0047] wherein, is an output voltage value, is a strain value, is an excitation voltage, is a strain gauge sensitivity coefficient, is a circuit gain.

[0048] By adopting the technical scheme, the present application mainly has the following technical effects:

[0049] 1. The detection mode of the detection mechanism is adjusted by adjusting the detection point at which the detection carrier abuts against the negative electrode material, the first strain gauge can capture the surface defect fluctuation of the negative electrode material in real time, and is suitable for stable conveying conditions; the arc bending part has a preset curvature, and thus the strain value output by the second strain gauge is significantly amplified due to nonlinear deformation under force, so that the second strain gauge can capture transient events under high-speed conveying conditions, and the detection mode is selected according to the conveying speed of the conveying roller, thereby enhancing the practicability of the negative electrode material detection device.

[0050] 2. The size of the detection carrier is matched with the size of the limiting slide, the outer edge abutting surface of the arc bending part is tangent to the detection surface of the strip-shaped negative electrode material, so that the outer edge abutting surface of the arc bending part and the detection surface of the strip-shaped negative electrode material can maintain continuous linear contact, and when the abutting point slips due to the deflection of the support shaft with the detection carrier, the detection mechanism is in contact with the negative electrode material at all times during the switching of the detection mode because the arc length of the abutting surface is greater than the maximum adjustment stroke, so that the detection blind area is avoided, and seamless switching of the detection mode is realized.

[0051] 3. By means of the online health assessment mechanism and the embedded adaptive compensation algorithm, the measurement uncertainty dynamic control and quantitative error correction of the device under performance degradation conditions are realized, the detection data under the sub-health state still meets the process precision requirements, the traditional post-fault shutdown mode is changed into a coordinated mode of reduced capacity operation and planned maintenance, the unplanned downtime is significantly compressed, and thus the comprehensive efficiency of the equipment and the continuous operation ability of the production line are systematically improved. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1It is a structural schematic view of a solid-state battery negative material detection device of the present application;

[0053] Figure 2 It is a structural schematic view of a solid-state battery negative material detection device (another view) of the present application;

[0054] Figure 3 It is a side view structural schematic view of a solid-state battery negative material detection device of the present application;

[0055] Figure 4 It is a structural schematic view of a solid-state battery negative material detection device of the present application;

[0056] Figure 5 It is a structural schematic view of a detection mechanism in a solid-state battery negative material detection device of the present application;

[0057] Figure 6 It is a structural schematic view of a solid-state battery negative material detection device (flat and straight part detection) of the present application;

[0058] Figure 7 It is a structural schematic view of a solid-state battery negative material detection device (flat and straight part detection to arc bending part detection switching) of the present application;

[0059] Figure 8 It is a structural schematic view of a solid-state battery negative material detection device (arc bending part detection) of the present application;

[0060] Figure 9 It is a flow schematic view of a solid-state battery negative material detection method of the present application.

[0061] The meanings of the reference signs are as follows:

[0062] 1, support mechanism; 11, support frame; 12, conveying roller;

[0063] 2, deflection mechanism; 21, limit slide; 211, arc slide; 22, support shaft; 23, pry frame; 24, telescopic assembly; 25, support cylinder;

[0064] 3, detection mechanism; 31, detection carrier; 311, connecting part; 312, flat and straight part; 313, arc bending part; 314, chamfered part; 315, bearing sheet; 316, cutting baffle; 317, strain cutting groove; 32, first strain sheet; 33, second strain sheet; 34, connecting seat; 35, electromagnet;

[0065] 4, adjusting assembly; 41, motor frame; 42, motor; 43, driving gear; 44, driven gear. DETAILED DESCRIPTION

[0066] In order to better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the specification of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0067] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is explicitly contemplated that embodiments described herein can be combined with other embodiments.

[0068] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is explicitly contemplated that embodiments described herein can be combined with other embodiments. Figures 1-8 The first aspect of the present application provides a solid-state battery negative material detection device, comprising: a support mechanism 1, a deflection mechanism 2 arranged on the support mechanism 1, a detection mechanism 3 connected with the deflection mechanism 2, and an adjusting assembly 4 connected with the detection mechanism 3.

[0069] In some embodiments, the support mechanism 1 is a part of the detection device for fixing and supporting parts, which comprises a support frame 11 and a conveying roller 12 arranged on the support frame 11. In some embodiments, the support frame 11 is a support structure for supporting other parts. Further, the conveying roller 12 is arranged on the support frame 11. In some embodiments, the conveying roller 12 can be a power component that drives the belt-shaped negative material into the detection area by rotating and relying on friction to pull the belt-shaped material forward at a set speed and tension.

[0070] In some embodiments, the deflection mechanism 2 is arranged on the support mechanism 1 and connected with the detection mechanism 3 for adjusting the angle of the detection mechanism 3, which comprises a limiting slide 21, a support shaft 22 connected with the limiting slide 21, a pry frame 23 connected with the support shaft 22, and a telescopic assembly 24 and a support cylinder 25 connected with the pry frame 23. In some embodiments, the limiting slide 21 is a support structure, and an arc-shaped slide 211 is arranged on the limiting slide 21. In some embodiments, one end of the support shaft 22 is slidingly connected with the arc-shaped slide 211, and under the action of external force, the support shaft 22 can slide along the arc-shaped slide 211.

[0071] Further, one end of the pry frame 23 is connected with the support shaft 22, the middle part is hingedly connected with the support frame 11, and the other end is connected with the telescopic assembly 24, forming a lever structure. In some embodiments, the telescopic assembly 24 can be any one of a telescopic oil cylinder, a telescopic air cylinder and an electric telescopic rod. The output end of the telescopic assembly 24 is connected with the pry frame 23. By the telescoping of the telescopic assembly 24, the connection between the pry frame 23 and the support frame 11 serves as a fulcrum, and the support shaft 22 is driven to slide along the setting direction of the arc-shaped slide rail 211.

[0072] Further, one end of the support cylinder 25 is connected with the pry frame 23, and the other end is connected with the end of the support shaft 22 away from the pry frame 23 through a connecting piece. The above structure makes the support cylinder 25 connected with the pry frame 23 driven to slide along with the support shaft 22, and the end of the support shaft 22 away from the pry frame 23 is driven to slide in the other set of limiting slide frames 21 through the connecting piece by the same distance, so as to ensure that the two ends of the support shaft 22 slide synchronously.

[0073] In some embodiments, the detection mechanism 3 is a part of the detection device for detecting the negative electrode material, which includes a detection carrier 31, and a first strain gauge 32 and a second strain gauge 33 arranged on the detection carrier 31. In some embodiments, the detection carrier 31 is a support structure of the first strain gauge 32 and the second strain gauge 33. In some embodiments, the first strain gauge 32 and the second strain gauge 33 are used to obtain the strain data of the detection carrier 31, i.e. the local deformation amount of the detection carrier 31 under the action of force.

[0074] Further, one end of the detection carrier 31 is connected with the support shaft 22, and the other end is in abutment with the belt-shaped negative electrode material. When there are protrusions and / or depressions on the surface of the moving belt-shaped negative electrode material, the contact state between the detection carrier 31 and the belt-shaped negative electrode material will be forced to change. For example, when a protrusion passes, the detection carrier 31 is instantaneously lifted up, generating a forced displacement upward. As the detection carrier 31 is an elastic body, it will be bent / compressed and deformed, and the surface will be strained. Finally, through the conversion of the first strain gauge 32 / second strain gauge 33, a voltage pulse signal is output, so as to convert the geometric change of the micro topography of the negative electrode material surface into the elastic strain of the macro carrier, and then realize the output of the electric signal through the strain gauge, so as to obtain the surface topography of the negative electrode material.

[0075] In some more preferred embodiments, the detection carrier 31 includes a connecting part 311, a flat part 312 connected with the connecting part 311, an arc-shaped part 313 connected with the flat part 312, and a chamfered part 314 connected with the arc-shaped part 313. The connecting part 311 is connected with the support shaft 22, so as to connect the detection mechanism 3 with the deflection mechanism 2.

[0076] Further, the flat portion 312 is a straight plate structure for bearing the first strain gauge 32; the arc portion 313 is an arc plate structure for bearing the second strain gauge 33. In some embodiments, after the detection carrier 31 is connected to the support shaft 22 near one end of the flat portion 312, when the deflection mechanism 2 drives the support shaft 22 to slide along the setting direction of the arc-shaped slide 211, the detection carrier 31 will deflect along with the sliding of the support shaft 22, thereby changing the detection point of the detection carrier 31 abutting against the negative electrode material.

[0077] In some embodiments, the deflection mechanism 2 cooperates with the detection mechanism 3 to adjust the detection mode of the detection mechanism 3 by adjusting the detection point of the detection carrier 31 abutting against the negative electrode material. Further, when the flat portion 312 abuts against the negative electrode material, linear bending deformation occurs due to force, and the first strain gauge 32 can capture the surface defect fluctuation of the negative electrode material in real time, so it is suitable for stable conveying conditions such as the drying section after coating. When the arc portion 313 abuts against the negative electrode material, nonlinear deformation occurs due to the preset curvature of the arc portion 313, so the strain value output by the second strain gauge 33 is significantly amplified, which can capture transient events in high-speed conveying conditions. Therefore, the detection mode can be selected according to the conveying speed of the conveying roller 12, thereby enhancing the practicability of the negative electrode material detection device. For example, in the low-speed stable conveying condition, the flat portion 312 can be used to contact the negative electrode material, and the first strain gauge 32 can be used to detect the surface topography of the negative electrode material.

[0078] In some embodiments, the detection carrier 31 is an integrally formed structure, and the size of the detection carrier 31 is adapted to the size of the limiting slide 21, that is, the outer edge abutting surface of the arc portion 313 is tangent to the detection surface of the negative electrode material. The above results enable the outer edge abutting surface of the arc portion 313 to maintain continuous linear contact with the detection surface of the negative electrode material, that is, when the detection carrier 31 deflects along with the support shaft 22 to cause the abutting point to slip, because the abutting surface has a longer arc length than the maximum adjustment stroke, the detection mechanism 3 is always in contact with the negative electrode material during the switching of the detection mode, thereby avoiding the detection blind area and realizing seamless switching of the detection mode. In some preferred embodiments, the included angle of the arc portion 313 is 90° (i.e., the angle of the included angle A is 90°), and the included angle of the chamfer portion 314 is 110° (i.e., the angle of the included angle B is 110°). Figure 6 Figure 6

[0079] In some more preferred embodiments, the detection mechanism 3 further comprises a connecting seat 34 connected to the detection carrier 31, and an electromagnet 35 arranged on the connecting seat 34, wherein the electromagnet 35 is used to realize the self-calibration process of the first strain gauge 32 and the second strain gauge 33. The self-calibration process will be further described below.​​

[0080] Further, the detection mechanism 3 can include multiple groups of detection carriers 31, wherein each group of detection carriers 31 is provided with three bearing sheets 315, the three bearing sheets 315 are of the same structure, and the flat portions 312 and the arc-shaped portions 313 of the three bearing sheets 315 are not connected and do not interfere with each other.

[0081] In some embodiments, the detection carrier 31 further includes a cutting bifurcated plate 316 and a strain cutting groove 317 provided at the connection between the connecting portion 311 and the flat portion 312, wherein the cutting bifurcated plate 316 and the strain cutting groove 317 are respectively located at the top and bottom of the plate-shaped detection carrier 31. In some more preferred embodiments, only the cutting bifurcated plates 316 are provided on the bearing sheets 315 located at the two sides in each group of detection carriers 31, and the bearing sheet 315 located in the middle is not provided with a cutting bifurcated plate 316. The cutting bifurcated plate 316 is matched with the electromagnet 35, and the electromagnet 35 applies an electromagnetic force to the cutting bifurcated plate 316 to realize the self-calibration process of the first strain gauge 32 and the second strain gauge 33. The strain cutting groove 317 is provided at the bottom of the plate-shaped detection carrier 31 to amplify the local strain and improve the sensitivity of strain detection.

[0082] In some embodiments, the adjusting assembly 4 is connected to the detection mechanism 3 for adjusting the pressure of the detection mechanism 3, which includes a motor frame 41, a motor 42 provided on the motor frame 41, a driving gear 43 connected to the motor 42, and a driven gear 44 engaged with the driving gear 43. In some embodiments, the motor frame 41 is used to fix the motor 42, wherein the motor frame 41 is connected to the pry frame 23, the driving gear 43 is connected to the output end of the motor 42, and the driven gear 44 is connected to the support shaft 22. By rotating the motor 42, the support shaft 22 is driven to rotate, thereby driving the detection carrier 31 to rotate, so as to adjust the pressure of the detection carrier 31 on the strip-shaped negative electrode material. On the other hand, the detection carrier 31 can also adapt to strip-shaped negative electrode materials of different thicknesses.

[0083] Further, the axis of the motor frame 41 and the driving gear 43 is collinear with the hinge axis of the pry frame 23 and the support frame 11, and the arc-shaped slide 211 of the limiting slide frame 21 has the axis as the center. When the support shaft 22 slides in the arc-shaped slide 211, the adjusting assembly 4 connected to the pry frame 23 rotates synchronously around the hinge axis.

[0084] Please refer to Figure 9 The second aspect of the present application provides a solid-state battery negative electrode material detection method based on the solid-state battery negative electrode material detection device in the above-mentioned scheme, which includes the following steps:

[0085] S1, constructing a mechanical equation based on the structure of the detection carrier;

[0086] In some embodiments, the mechanical equation comprises:

[0087] ;

[0088] wherein, is the response output of the middle carrier sheet, is the tension component;

[0089] In some embodiments, the response output of the middle carrier sheet only reflects the tension of the strip-shaped negative electrode material and is not affected by the electromagnetic force.

[0090] The mechanical equation further comprises:

[0091] ;

[0092] ;

[0093] wherein, is the response output of the left carrier sheet, is the force transmission coefficient of the left carrier sheet, is the electromagnetic force, is the offset error;

[0094] is the response output of the right carrier sheet, is the force transmission coefficient of the right carrier sheet, is the electromagnetic force, is the offset error;

[0095] In some embodiments, the response output of the two-side carrier sheet comprises the tension component, the electromagnetic force component and the offset error.

[0096] S2, detecting carrier initial parameter calibration;

[0097] In some embodiments, the detection carrier parameter is used to describe the mechanical response characteristics of the detection carrier 31, and in some embodiments, the detection carrier parameter comprises a force transmission coefficient, wherein the force transmission coefficient is used to describe the amount of strain response change caused by a unit change in electromagnetic force.

[0098] In some embodiments, the detection carrier initial parameter refers to the mechanical response characteristics of the detection carrier 31 in an empty state (without strip-shaped negative electrode material), and the detection carrier initial parameter comprises an initial force transmission coefficient.

[0099] In some embodiments, the detection carrier initial parameter calibration comprises:

[0100] S201, applying a step magnetic force by an electromagnet and collecting initial strain data;

[0101] In some embodiments, the step magnetic force applied to the detection carrier 31 by the electromagnet 35 refers to the electromagnetic force generated by precisely controlling the current / voltage of the electromagnet 35 to increase or decrease step by step according to the preset discrete values. For example, the step magnetic force can be first applied to 0.5N magnetic force for a certain time, then increased to 1.0N and kept, and then increased to 1.5N and kept.

[0102] In some embodiments, the initial strain data refers to the real-time and synchronous acquisition of the response data of the measured object while the step magnetic force is applied, and the micro-strain value obtained by the strain gauge (first strain gauge or second strain gauge) is used to represent the linear strain of the material surface.

[0103] As an example, the initial strain data is shown in Table 1 below:

[0104] Table 1 Initial strain data

[0105]

[0106] S202, determining an initial force transmission coefficient based on the initial strain data;

[0107] In some embodiments, the initial force transmission coefficient is calculated as follows:

[0108] ;

[0109] wherein, is the initial force transmission coefficient of the left bearing sheet, is the change amount of the response output of the left bearing sheet; is the change amount of the magnetic force;

[0110] ;

[0111] wherein, is the initial force transmission coefficient of the right bearing sheet, is the change amount of the response output of the left bearing sheet; is the change amount of the magnetic force;

[0112] As an example, ,

[0113] .

[0114] S3, detecting the actual parameters of the detection carrier;

[0115] In some embodiments, the actual parameters of the detection carrier refer to the mechanical response characteristics of the detection carrier 31 under the load state (with the strip-shaped negative electrode material), and the actual parameters of the detection carrier include the actual force transmission coefficient.

[0116] In some embodiments, the detecting the actual carrier parameter comprises:

[0117] S301, applying a magnetic force by an electromagnet and collecting actual strain data;

[0118] In some embodiments, a magnetic force can be applied to the detection carrier 31 by the electromagnet 35, in some embodiments, the magnetic force refers to the electromagnetic force generated by precisely controlling the current / voltage of the electromagnet 35. For example, the electromagnetic force can be 1.0N magnetic force applied and maintained for a certain time.

[0119] In some embodiments, the strain data refers to the response data of the measured object collected in real time and synchronously while the magnetic force is applied, and the micro-strain value obtained by the strain gauge is used to characterize the surface linear strain of the material.

[0120] In some embodiments, the actual strain data includes: the micro-strain value when no test electromagnetic force is applied and the micro-strain value when the test electromagnetic force is applied.

[0121] S302, determining the actual force transmission coefficient based on the actual strain data;

[0122] In some embodiments, the actual force transmission coefficient can be determined according to the mechanical equation and the actual strain data. According to the mechanical equation analysis in step S1, it can be obtained that:

[0123] The micro-strain value when no test electromagnetic force is applied is:

[0124] ;

[0125] ;

[0126] ;

[0127] wherein, is the response output of the middle carrier sheet when no test electromagnetic force is applied; is the response output of the left carrier sheet when no test electromagnetic force is applied; is the response output of the right carrier sheet when no test electromagnetic force is applied;

[0128] The micro-strain value when the test electromagnetic force is applied is:

[0129] ;

[0130] ;

[0131] ;

[0132] wherein, the response output of the left side carrier when no test electromagnetic force is applied; the response output of the left side carrier when no test electromagnetic force is applied; the response output of the right side carrier when no test electromagnetic force is applied; the magnitude of the test electromagnetic force;

[0133] In some embodiments, after determining the actual strain data, i.e. 、 、 、 、 、 and the actual force transfer coefficients can be solved inversely 、 .

[0134] i.e. ;

[0135] ;

[0136] wherein, is the actual force transfer coefficient of the left side carrier, is the actual force transfer coefficient of the right side carrier;

[0137] As an example, , ; ; ;

[0138] , ; ; ;

[0139] then ; .

[0140] S4, determining a set of detection carrier health parameters based on the detection carrier initial parameters and the detection carrier actual parameters;

[0141] In some embodiments, the set of detection carrier health parameters is used to quantitatively evaluate the degree of mechanical performance degradation of the detection carrier itself.

[0142] In some embodiments, the set of detection carrier health parameters includes: a decay rate for describing the loss of efficiency of the force transfer path;

[0143] and an asymmetry for describing the deviation of symmetry of the bilateral force transfer.

[0144] In some embodiments, the decay rate is calculated in the following manner:

[0145] ;

[0146] ;

[0147] wherein, is the attenuation rate of the left bearing sheet; is the attenuation rate of the right bearing sheet;

[0148] The calculation method of the asymmetry is:

[0149] ;

[0150] wherein, is the asymmetry.

[0151] As an example:

[0152] ;

[0153] ;

[0154] .

[0155] S5, determining the detection carrier health state based on the detection carrier health parameter set, the first health parameter threshold set, and the second health parameter threshold set;

[0156] In some embodiments, the detection carrier health state is used to evaluate the degree of mechanical performance degradation of the force transmission path in the detection carrier, and is specifically used to describe the structural integrity and service reliability of the detection carrier itself.

[0157] In some embodiments, the detection carrier health state includes a normal state, a sub-health state, and a shutdown for inspection state.

[0158] In some embodiments, the first health parameter threshold set and the second health parameter threshold set refer to a threshold set for judging the detection carrier health state. In some embodiments, the first health parameter threshold set can include a first attenuation rate threshold and a first asymmetry threshold; and the second health parameter threshold set includes a second attenuation rate threshold and a second asymmetry threshold.

[0159] In some embodiments, the determination of the detection carrier health state includes:

[0160] S501, determining the overall health state of the detection carrier based on the state of each health parameter in the detection carrier health parameter set;

[0161] In some embodiments, the determination of the overall health state of the detection carrier based on the state of each health parameter in the detection carrier health parameter set includes:

[0162] If all parameters in the set of health parameters of the detection carrier are less than the corresponding parameter threshold in the first set of health parameter thresholds, it is determined that the detection carrier is in a normal state;

[0163] If at least one parameter in the set of health parameters of the detection carrier is greater than or equal to the first set of health parameter thresholds, and all parameters are less than the corresponding parameter threshold in the second set of health parameter thresholds, it is determined that the detection carrier is in a sub-health state;

[0164] If at least one parameter in the set of health parameters of the detection carrier is greater than or equal to the corresponding parameter threshold in the second set of health parameter thresholds, it is determined that the detection carrier is in a shutdown state for inspection.

[0165] In some embodiments, the parameter thresholds in the first set of health parameter thresholds and the second set of health parameter thresholds can be set based on databases, historical data, etc.

[0166] As an example, in the first set of health parameter thresholds, the first attenuation rate threshold is 20%, and the first asymmetry threshold is 5%; in the second set of health parameter thresholds, the second attenuation rate threshold is 30%, and the second asymmetry threshold is 8%; it is determined that the health state of the detection carrier is a sub-health state.

[0167] S6, in response to the detection carrier being in a sub-health state, determining a strain compensation value based on the initial force transmission coefficient and the actual force transmission coefficient;

[0168] In some embodiments, the way of determining the strain compensation value based on the actual force transmission coefficient is:

[0169] ;

[0170] wherein, is the strain compensation value, is the strain measurement value, is the initial force transmission coefficient, is the actual force transmission coefficient;

[0171] As an example, after determining that the health state of the detection carrier is a sub-health state, the initial force transmission coefficient of the left bearing sheet is , the actual force transmission coefficient is , and the strain measurement value is 320με.

[0172] then ;

[0173] In some more preferred embodiments, after updating the strain compensation values of the left and right carrier sheets, a known step tension sequence (e.g. 0N→1N→1.5N→2N) can be applied to the middle carrier sheet by the external tension applying device, and the strain outputs at each tension point are synchronously collected, the least square method is used to fit the strain-tension curve slope, so as to independently and accurately obtain the actual force transmission coefficient of the middle carrier sheet, and then determine the strain compensation value of the middle carrier sheet, and the compensation method can be consistent with that of the left and right carrier sheets.

[0174] S7, determining a detection value based on the strain value;

[0175] In some embodiments, the detection value is used to represent the quantitative voltage signal output by the strain gauge-detection carrier system, reflecting the surface morphology and tension state of the negative electrode material.

[0176] In some embodiments, the detection value is calculated in the following manner:

[0177] ;

[0178] ;

[0179] wherein, Vout is the output voltage value, ε is the strain value, Vexc is the excitation voltage, K is the strain gauge sensitivity coefficient, G is the circuit gain;

[0180] In some embodiments, the strain measurement value can be obtained by a strain gauge measurement, and in some embodiments, the excitation voltage is a constant DC power supply voltage supplied to the strain gauge measurement bridge, usually 2V~10V, and the strain gauge sensitivity coefficient can be set based on the strain gauge properties. In some embodiments, the circuit gain is generally determined by the bridge configuration and the amplifier gain, and the range is generally 100~1000.

[0181] In some embodiments, during the above calculation process, the units of the coefficients and / or parameters can be set to maintain the consistency of the dimensions in the formula, for example, ε represents the true strain conversion, dimensionless; the circuit gain G is dimensionless; and the strain gauge sensitivity coefficient K is dimensionless.

[0182] As an example, let the excitation voltage be Vexc=2V, the sensitivity coefficient be K=2, and the circuit gain be G=100.

[0183] ;

[0184] In some embodiments, through the online health assessment mechanism and the embedded adaptive compensation algorithm, the measurement uncertainty of the device under the performance degradation condition is dynamically controlled and the quantization error is corrected, ensuring that the detection data under the sub-health state still meets the process precision requirements, and at the same time, the traditional post-failure shutdown mode is changed to the coordinated operation of the reduced capacity and the planned maintenance, significantly compressing the unplanned downtime, thereby systematically improving the comprehensive efficiency of the detection device and the continuous operation ability of the production line.

[0185] S8, determining the surface morphology of the negative electrode material based on the detection value;

[0186] In some embodiments, when the surface of the negative electrode material is flat, the stress of each strain gauge is uniform, and the output voltage values are basically consistent; if there are protrusions or depressions on the surface, local stress concentration will be caused in the corresponding area, resulting in sudden change of the output voltage of the specific strain gauge. By setting a threshold value δ, the absolute value of the difference between the output voltages of any two strain gauges is calculated When exceeds the threshold value δ, it can be determined that 、 the corresponding area has abnormal morphology. This differential detection method effectively eliminates the common-mode interference of the system, significantly improving the recognition sensitivity and positioning accuracy of the surface defects.

[0187] Finally, it should be noted that: the embodiments disclosed by the embodiments of the present application are only the preferred embodiments of the present application, and are used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand; it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for detecting solid-state battery anode materials, characterized in that, include: A support mechanism, a deflection mechanism disposed on the support mechanism, a detection mechanism connected to the deflection mechanism, and an adjustment component connected to the detection mechanism; The deflection mechanism is used to adjust the angle of the detection mechanism and includes: a limiting slide, a support shaft connected to the limiting slide, a pry bar connected to the support shaft, and a telescopic assembly and a support cylinder connected to the pry bar. The limiting slide is provided with an arc-shaped slide rail, and one end of the support shaft is slidably connected to the arc-shaped slide rail; The testing mechanism includes: a testing carrier, and a first strain gauge and a second strain gauge disposed on the testing carrier; The detection carrier includes: a connecting portion, a straight portion connected to the connecting portion, an arc-shaped portion connected to the straight portion, and a chamfered portion connected to the arc-shaped portion; The connecting part is connected to the support shaft; The straight section is a straight plate-like structure used to support the first strain gauge; the curved section is an arc-shaped plate-like structure used to support the second strain gauge. The detection mechanism further includes: a connecting seat connected to the detection carrier, and an electromagnet disposed on the connecting seat; One set of testing carriers has three carrier plates. The three carrier plates have the same structure, and the straight parts and curved parts of the three carrier plates are not connected. The detection carrier also includes a cutting fork plate and a strain groove disposed at the connection between the connecting part and the straight part, wherein the cutting fork plate and the strain groove are respectively located at the top and bottom of the plate-shaped detection carrier; In a set of detection carriers, only the bearing plates on both sides are equipped with cutting forks, which are adapted to electromagnets.

2. The solid-state battery negative electrode material detection device according to claim 1, characterized in that, The support mechanism includes: a support frame and a conveying roller disposed on the support frame; One end of the skid is connected to the support shaft, the middle part is hinged to the support frame, and the other end is connected to the telescopic assembly. The output end of the telescopic assembly is connected to the skid.

3. The solid-state battery negative electrode material detection device according to claim 2, characterized in that, The detection carrier is adapted to the limiting slide, and the outer edge of the curved part is tangent to the detection surface of the strip negative electrode material.

4. A method for detecting anode materials in solid-state batteries, characterized in that, The solid-state battery negative electrode material detection device according to claim 1 includes the following steps: Mechanical equations were constructed based on the structure of the detection carrier. Initial parameter calibration of the detection carrier; Detection of actual parameters of the detection carrier; Determine the health parameter set of the detection carrier based on the initial parameters and actual parameters of the detection carrier; The health status of the detection carrier is determined based on the health parameter set of the detection carrier, the first health parameter threshold set, and the second health parameter threshold set. In response to the detection carrier being in a sub-healthy state, the strain compensation value is determined based on the initial force transmission coefficient and the actual force transmission coefficient. Determine the detection value based on the strain value; The surface morphology of the negative electrode material is determined based on the detected values.

5. The method for detecting solid-state battery anode materials according to claim 4, characterized in that, The initial parameter calibration of the detection carrier includes: A stepped magnetic force was applied using an electromagnet, and initial strain data was collected. The initial force transfer coefficient is determined based on the initial strain data.

6. The method for detecting solid-state battery anode materials according to claim 5, characterized in that, The detection of actual parameters of the detection carrier includes: Magnetic force is applied using an electromagnet, and actual strain data is collected. The actual force transmission coefficient is determined based on actual strain data.

7. The method for detecting solid-state battery anode materials according to claim 6, characterized in that, The determination of the health status of the detection carrier includes: The overall health status of the detection carrier is determined based on the status of each health parameter in the health parameter set of the detection carrier. The determination of the overall health status of the detection carrier based on the status of each health parameter in the detection carrier health parameter set includes: If all parameters in the health parameter set of the detection carrier are less than the corresponding parameter threshold in the first health parameter threshold set, then the detection carrier is determined to be in a normal state. If at least one parameter in the health parameter set of the detection carrier is greater than or equal to the first health parameter threshold set, and all parameters are less than the corresponding parameter threshold in the second health parameter threshold set, then the detection carrier is determined to be in a sub-healthy state. If at least one parameter in the health parameter set of the detection carrier is greater than or equal to the corresponding parameter threshold in the second health parameter threshold set, then the detection carrier is determined to be in a shutdown and maintenance state.

8. The method for detecting solid-state battery anode materials according to claim 7, characterized in that, The method for determining the strain compensation value based on the actual force transmission coefficient is as follows: ； in, Strain compensation value, These are strain measurement values. This is the initial force transmission coefficient. This is the actual force transmission coefficient.

9. The method for detecting solid-state battery anode materials according to claim 8, characterized in that, The method for calculating the detection value is as follows: ； ； in, This is the output voltage value. The strain value, For excitation voltage, The strain gauge sensitivity coefficient, This represents the circuit gain.

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