Method and device for measuring thickness of lithium battery pole piece and electronic equipment

Abstract

The invention discloses a method and device for measuring the thickness of a lithium battery pole piece and electronic equipment, and belongs to the technical field of batteries, and the method comprises the steps: S1, measuring a first displacement value through a first laser displacement sensor located at the upper side of the pole piece; s2, a second displacement value is measured through a second laser displacement sensor located on the lower side of the pole piece, and the second laser displacement sensor directly faces the first laser displacement sensor; s3, calculating the thickness value of the pole piece according to a preset spacing value, the measured first displacement value and the measured second displacement value; s4, repeating the steps S1 to S3, and scanning the pole piece by the first laser displacement sensor and the second laser displacement sensor along a preset scanning path to obtain a plurality of thickness values; and S5, calculating the average thickness of the pole piece according to the obtained thickness values. The technical effects that the pole piece is not damaged in the measurement process, and the measurement precision and efficiency can be improved are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and in particular relates to a method, a device and an electronic device for measuring the thickness of a lithium battery pole piece. Background Art

[0002] In the manufacturing process of lithium batteries, precise control of the thickness of the pole piece is one of the key factors to ensure excellent battery performance and safety and reliability. The thickness of the pole piece not only directly affects the energy density, cycle life and charge and discharge efficiency of the battery, but also affects the safety of the battery during use. In the prior art, a contact measurement method is usually adopted. The contact measurement method mainly relies on the direct contact between the mechanical probe and the surface of the pole piece, and the thickness of the pole piece is estimated by measuring the distance between the contact points. However, contact measurement is very easy to cause damage to the surface of the pole piece. Due to the direct contact between the mechanical probe and the surface of the pole piece, scratches or indentations will inevitably be left on the pole piece, which not only affects the appearance quality of the pole piece, but also easily affects the overall performance of the battery. In addition, the contact pressure and contact area of the contact measurement are difficult to accurately control, resulting in large errors in the measurement results. The mechanical probe needs to contact the surface of the pole piece point by point for measurement. The entire measurement process takes a long time and it is difficult to meet the high efficiency requirements of large-scale industrial production.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the pole piece is easily damaged during the measurement process, and the measurement accuracy and efficiency are low.

[0005] To solve the above technical problems, the present invention provides a method for measuring the thickness of a lithium battery pole piece, the method comprising: S1, measuring a first displacement value by a first laser displacement sensor located on the upper side of the pole piece, the first laser displacement sensor being spaced apart from the upper surface of the pole piece, the first displacement value being the distance between the first laser displacement sensor and the upper surface of the pole piece; S2, measuring a second displacement value by a second laser displacement sensor located on the lower side of the pole piece, the second laser displacement sensor being spaced apart from the lower surface of the pole piece, the second laser displacement sensor being directly opposite the first laser displacement sensor, the second displacement value being the distance between the second laser displacement sensor and the lower surface of the pole piece; S3, calculating a thickness value of the pole piece based on a preset distance value and the measured first and second displacement values, the preset distance value being the distance between the first and second laser displacement sensors; S4, repeating S1 to S3, scanning the pole piece with the first and second laser displacement sensors along a preset scanning path to obtain a plurality of thickness values; and S5, calculating an average thickness of the pole piece based on the obtained plurality of thickness values.

[0006] Optionally, after S5, the step further includes placing a standard reference block between the first laser displacement sensor and the second laser displacement sensor; measuring a first reference value of the standard reference block by a first laser displacement sensor located on the upper side of the standard reference block, wherein the first reference value is the distance between the first laser displacement sensor and the upper surface of the standard reference block; measuring a second reference value of the standard reference block by a second laser displacement sensor located on the lower side of the standard reference block, wherein the second reference value is the distance between the second laser displacement sensor and the lower surface of the standard reference block; calculating a measured thickness of the standard reference block based on the first reference value and the second reference value; and calculating a compensation coefficient based on ΔT=T1-T2, wherein T1 is the measured thickness, T2 is the standard thickness of the standard reference block, and ΔT is the compensation coefficient.

[0007] Optionally, the difference between the average thickness and the compensation coefficient is used as the actual thickness of the pole piece.

[0008] Optionally, calculating the measured thickness of the standard reference block based on the first reference value and the second reference value includes calculating the measured thickness based on T1=T3-(T4+T5), wherein T1 is the measured thickness, T3 is the distance between a first laser displacement sensor located on the upper side of the standard reference block and a second laser displacement sensor located on the lower side of the standard reference block, T4 is the first reference value, and T5 is the second reference value.

[0009] Optionally, the calculation of the thickness value of the pole piece based on the preset spacing value and the measured first displacement value and the second displacement value includes calculating the thickness value of the pole piece based on D=D1-(D2+D3), wherein D is the thickness value of the pole piece, D1 is the preset spacing value, D2 is the first displacement value, and D3 is the second displacement value.

[0010] Optionally, the preset scanning path includes a direction extending along the length of the pole piece.

[0011] Optionally, calculating the average thickness of the pole piece based on the obtained multiple thickness values includes according to d1=(1 / n)*d, where n is the number of the multiple thickness values, d is the sum of the multiple thickness values, and d1 is the average thickness of the pole piece.

[0012] According to another aspect of the present invention, the present invention also provides a device for measuring the thickness of a lithium battery pole piece, the device comprising a roller assembly, a first laser displacement sensor located on the upper side of the pole piece, a second laser displacement sensor located on the lower side of the pole piece, a first robotic arm connected to the first laser displacement sensor, and a second robotic arm connected to the second laser displacement sensor, the roller assembly being used to transport the pole piece out of the oven, the first laser displacement sensor being used to emit a laser beam vertically into the upper side of the pole piece, and the second laser displacement sensor being used to emit a laser beam vertically into the lower side of the pole piece.

[0013] Optionally, the laser beam emitted by the first laser displacement sensor is perpendicular to the upper surface of the pole piece, and the laser beam emitted by the second laser displacement sensor is perpendicular to the lower surface of the pole piece.

[0014] According to another aspect of the present invention, the present invention also provides an electronic device for measuring the thickness of a lithium battery pole piece, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the following steps are implemented: S1: measuring a first displacement value by a first laser displacement sensor located on the upper side of the pole piece, where the first displacement value is the distance between the first laser displacement sensor and the upper surface of the pole piece; S2: measuring a second displacement value by a second laser displacement sensor located on the lower side of the pole piece, where the laser beam of the second laser displacement sensor is perpendicular to the lower surface of the pole piece, where the second displacement value is the distance between the second laser displacement sensor and the upper surface of the pole piece; S3: calculating the thickness value of the pole piece based on a preset distance value and the measured first and second displacement values, where the preset distance value is the distance between the first and second laser displacement sensors; S4: repeating steps S1 to S3, scanning the pole piece with the first and second laser displacement sensors along a preset scanning path to obtain a plurality of thickness values; and S5: calculating the average thickness of the pole piece based on the obtained plurality of thickness values.

[0015] Beneficial effects:

[0016] The present invention provides a method for measuring the thickness of a lithium battery electrode. The method comprises: measuring a first displacement value by a first laser displacement sensor located on the upper side of the electrode, the first laser displacement sensor being spaced apart from the upper surface of the electrode, and the first displacement value being the distance between the first laser displacement sensor and the upper surface of the electrode. A second displacement value is measured by a second laser displacement sensor located on the lower side of the electrode, the second laser displacement sensor being spaced apart from the lower surface of the electrode, and facing the first laser displacement sensor, and the second displacement value being the distance between the second laser displacement sensor and the upper surface of the electrode. The thickness of the electrode is calculated based on a preset distance and the measured first and second displacement values, the preset distance being the distance between the first and second laser displacement sensors. The above steps are repeated, the first and second laser displacement sensors are used to scan the electrode along a preset scanning path to obtain multiple thickness values, and the average thickness of the electrode is calculated based on the multiple thickness values obtained. In this way, the thickness of the electrode is detected through non-contact measurement by the first and second laser displacement sensors, avoiding physical damage to the electrode that would be caused by contact measurement. By synchronously measuring the first and second laser displacement sensors located on the upper and lower sides of the pole piece, combined with a preset spacing value, the thickness at the corresponding reflected light spot position in the pole piece can be directly calculated, thereby improving measurement efficiency. Continuous scanning is then performed along the preset path, and multiple thickness values spatially distributed on the pole piece are calculated to collect thickness data at different positions on the pole piece to eliminate single-point measurement errors. The average value is ultimately taken to reduce the impact of local deviations on the overall thickness, thereby improving the reliability and accuracy of the measurement results. This achieves the technical effect of not damaging the pole piece during the measurement process and improving measurement accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A flow chart of a method for measuring the thickness of a lithium battery electrode provided by an embodiment of the present invention;

[0019] Figure 2 A schematic structural diagram of a device for measuring the thickness of a lithium battery electrode provided by an embodiment of the present invention.

[0020] Figure 3 A schematic diagram of an electronic device for measuring the thickness of a lithium battery electrode provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0022] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0023] In the embodiments of this application, "at least one" refers to one or more; "a plurality" refers to two or more. In the description of this application, the terms "first," "second," "third," etc. are used only for the purpose of distinguishing descriptions and should not be understood as indicating or implying relative importance or order.

[0024] References to "one embodiment" or "some embodiments" described in this specification mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, in this specification, the terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways. It should be noted that in the embodiments of the present application, "and / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0025] It should be pointed out that, in the embodiment of the present invention, when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. At the same time, "connection" in the embodiment of the present application can also be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, A and B are connected, which can be either A and B directly connected, or A and B indirectly connected through one or more other electrical components. The terms "vertical", "horizontal", "left", "right" and similar expressions used in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the present invention.

[0026] A method for measuring the thickness of a lithium battery electrode provided by the first embodiment of the present invention is as follows: Figure 1 As shown, Figure 1 1 is a flow chart of a method for measuring the thickness of a lithium battery electrode sheet provided by an embodiment of the present invention. The method for measuring the thickness of a lithium battery electrode sheet provided by an embodiment of the present invention includes the following steps:

[0027] Step S1: measuring a first displacement value by a first laser displacement sensor 2 located on the upper side of the pole piece 6, wherein the first laser displacement sensor 2 is spaced apart from the upper surface of the pole piece 6, and the first displacement value is the distance between the first laser displacement sensor 2 and the upper surface of the pole piece 6;

[0028] Specifically, the first laser displacement sensor 2 can use a semiconductor laser as a light source. The first laser displacement sensor 2 can be fixed above the pole piece 6 by the first robotic arm 4. The optical axis of the first laser displacement sensor 2 is parallel to the normal direction of the upper surface of the pole piece 6. That is, the laser beam emitted by the first laser displacement sensor 2 is vertically incident on the upper surface of the pole piece 6 at an incident angle of 90° to form a first light spot. The first laser displacement sensor 2 can measure the distance between the first laser displacement sensor 2 and the upper surface of the pole piece 6 through a laser rangefinder.

[0029] Step S2: measuring a second displacement value using a second laser displacement sensor 3 located on the lower side of the pole piece 6, wherein the second laser displacement sensor 3 is spaced apart from the lower surface of the pole piece 6 and faces the first laser displacement sensor 2. The second displacement value is the distance between the second laser displacement sensor 3 and the lower surface of the pole piece 6.

[0030] Specifically, the second laser displacement sensor 3 can use a semiconductor laser as its light source. The second laser displacement sensor 3 can be fixed below the pole piece 6 via the second robotic arm 5. The optical axis of the second laser displacement sensor 3 is parallel to the normal direction of the lower surface of the pole piece 6. That is, the laser beam emitted by the second laser displacement sensor 3 is perpendicular to the lower surface of the pole piece 6 at an incident angle of 90°, forming a second light spot. The second laser displacement sensor 3 can measure the distance between the second laser displacement sensor 3 and the lower surface of the pole piece 6 using a laser rangefinder. The second laser displacement sensor 3 is directly opposite the first laser displacement sensor 2, that is, the second light spot is aligned with the position of the first light spot. The second laser displacement sensor 3 and the first laser displacement sensor 2 can emit laser beams simultaneously.

[0031] Step S3, calculating the thickness of the pole piece 6 according to a preset spacing value and the measured first displacement value and the second displacement value, wherein the preset spacing value is the spacing between the first laser displacement sensor 2 and the second laser displacement sensor 3;

[0032] As an embodiment, the thickness value of the pole piece 6 is calculated based on the preset spacing value and the measured first displacement value and the second displacement value, including calculating the thickness value of the pole piece 6 based on D=D1-(D2+D3), wherein D is the thickness value of the pole piece 6, D1 is the preset spacing value, D2 is the first displacement value, and D3 is the second displacement value.

[0033] Specifically, if an industrial computer is used as a data processing unit, according to the first displacement value and the second displacement value measured in the above steps S1 and S2, the thickness of the pole piece 6 is equal to the difference between the above preset spacing value and the first displacement value and the second displacement value. Since the preset spacing value remains unchanged, the thickness of the pole piece 6 is respectively associated with the above first displacement value and the above second displacement value.

[0034] Step S4, repeating S1 to S3, scanning the pole piece 6 with the first laser displacement sensor 2 and the second laser displacement sensor 3 along a preset scanning path to obtain a plurality of thickness values; wherein the preset scanning path includes a direction extending along the length of the pole piece 6.

[0035] Specifically, the first laser displacement sensor 2 can be driven by the first robotic arm 4, and the second robotic arm 5 can drive the second laser displacement sensor 3 to scan the pole piece 6 along the length extension direction of the pole piece 6 respectively. In addition, the start and stop states of the first robotic arm 4 and the second robotic arm 5 can be assisted by the machine vision system. For example, when the machine vision system detects that the laser beams emitted by the first laser displacement sensor 2 and the second laser displacement sensor 3 reach the edge area of the pole piece 6, the first robotic arm 4 and the second robotic arm 5 are controlled to stop moving respectively. When the machine vision system detects that the laser beams emitted by the first laser displacement sensor 2 and the second laser displacement sensor 3 are located on the pole piece 6, the first robotic arm 4 and the second robotic arm 5 are controlled to move along the length extension direction of the pole piece 6 respectively to obtain multiple thickness values.

[0036] Step S5: Calculate the average thickness of the electrode 6 according to the obtained multiple thickness values.

[0037] The calculation of the average thickness of the pole piece 6 based on the obtained multiple thickness values includes: according to d1=(1 / n)*d, where n is the number of the multiple thickness values, d is the sum of the multiple thickness values, and d1 is the average thickness of the pole piece 6.

[0038] Specifically, a buffer is used in an industrial computer to store the most recent thickness values, and then the average thickness of the electrode 6 is calculated according to d1 = (1 / n) * d, where d1 is the average thickness of the electrode 6. For example, when n is 3, assuming that the multiple thickness values are 0.3 mm, 0.4 mm, and 0.2 mm, respectively, d is 0.9 mm and d1 is 0.3 mm.

[0039] A method for measuring the thickness of a lithium battery electrode provided in Example 1 of the present invention further includes, after the above-mentioned S5, placing a standard reference block between the first laser displacement sensor 2 and the second laser displacement sensor 3; measuring a first reference value of the standard reference block by the first laser displacement sensor 2 located on the upper side of the standard reference block, wherein the first reference value is the distance between the first laser displacement sensor 2 and the upper surface of the standard reference block; measuring a second reference value of the standard reference block by the second laser displacement sensor 3 located on the lower side of the standard reference block, wherein the second reference value is the distance between the second laser displacement sensor 3 and the lower surface of the standard reference block; calculating the measured thickness of the standard reference block based on the first reference value and the second reference value; and calculating a compensation coefficient based on ΔT=T1-T2, wherein T1 is the measured thickness, T2 is the standard thickness of the standard reference block, and ΔT is the compensation coefficient.

[0040] As an implementation manner, the difference between the average thickness and the compensation coefficient is used as the actual thickness of the pole piece 6 .

[0041] As an embodiment, calculating the measured thickness of the standard reference block based on the first reference value and the second reference value includes calculating the measured thickness based on T1=T3-(T4+T5), wherein T1 is the measured thickness, T3 is the distance between the first laser displacement sensor 2 located on the upper side of the standard reference block and the second laser displacement sensor 3 located on the lower side of the standard reference block, T4 is the first reference value, and T5 is the second reference value.

[0042] Specifically, the standard reference block can be a quartz glass standard. According to the measurement model, T1 = T3 - (T4 + T5), when T1 ≠ T2, the compensation coefficient ΔT = T1 - T2 reflects the systematic error. By correcting the average thickness d1 to d1 - ΔT, systematic errors caused by factors such as sensor drift and environmental changes can be eliminated, achieving dynamic error compensation.

[0043] In order to provide a detailed description of a device for measuring the thickness of a lithium battery pole piece provided by the present invention, the above embodiment 1 provides a detailed description of a method for measuring the thickness of a lithium battery pole piece. Based on the same inventive concept, the present application also provides a device for measuring the thickness of a lithium battery pole piece, see embodiment 2 for details.

[0044] See Figure 2 , Figure 2 Schematic diagram of a device for measuring the thickness of a lithium battery pole piece provided by an embodiment of the present invention. Embodiment 2 of the present invention provides a device for measuring the thickness of a lithium battery pole piece, comprising a roller assembly 1, a first laser displacement sensor 2, a second laser displacement sensor 3, a first robotic arm 4, and a second robotic arm 5. The roller assembly 1 is used to convey the pole piece 6 after it exits the oven. The first laser displacement sensor 2 is located on the upper side of the pole piece 6 and is used to emit a laser beam perpendicularly to the upper side of the pole piece 6. The second laser displacement sensor 3 is located on the lower side of the pole piece 6 and is used to emit a laser beam perpendicularly to the lower side of the pole piece 6. The first robotic arm 4 is connected to the first laser displacement sensor 2, and the second robotic arm 5 is connected to the second laser displacement sensor 3. The first laser displacement sensor 2 carried by the first robotic arm 4 can scan along the length of the pole piece 6, and the second robotic arm 5 can also drive the synchronous tracking movement of the second laser displacement sensor 3, so that the upper and lower light spots formed by the first laser displacement sensor 2 and the second laser displacement sensor 3 on the pole piece 6 are always vertically aligned.

[0045] As an embodiment, the laser beam emitted by the first laser displacement sensor 2 is perpendicular to the upper surface of the pole piece 6, and the laser beam emitted by the second laser displacement sensor 3 is perpendicular to the lower surface of the pole piece 6. The first laser displacement sensor 2 can be rigidly connected to the end of the first robotic arm 4 via a rigid bracket. The laser beam emitted by the first laser displacement sensor 2 is perpendicular to the upper surface of the pole piece 6 at a 90° incident angle, forming a first light spot. The second laser displacement sensor 3 is rigidly connected to the end of the second robotic arm 5 via an inverted bracket. The laser beam of the same wavelength emitted by the second laser displacement sensor 3 can always maintain a 90° incident angle and be perpendicular to the lower surface of the pole piece 6, forming a second light spot.

[0046] The present invention provides a device for measuring the thickness of a lithium battery pole piece. A pole piece 6 is conveyed out of an oven via a roller assembly 1. A first laser displacement sensor 2 is located on the upper side of the pole piece 6, and a second laser displacement sensor 3 is located on the lower side of the pole piece 6. A first robotic arm 4 is connected to the first laser displacement sensor 2, and a second robotic arm 5 is connected to the second laser displacement sensor 3. The first laser displacement sensor 2 is used to emit a laser beam perpendicularly to the upper side of the pole piece 6, and the second laser displacement sensor 3 is used to emit a laser beam perpendicularly to the lower side of the pole piece 6. In this way, the thickness of the pole piece 6 is detected through non-contact measurement by the first laser displacement sensor 2 and the second laser displacement sensor 3, avoiding physical damage to the pole piece 6 caused by contact measurement. Through the synchronous measurement of the first laser displacement sensor 2 and the second laser displacement sensor 3 located on the upper and lower sides of the pole piece 6, combined with a preset spacing value, the thickness at the corresponding reflected light spot position in the pole piece 6 can be directly calculated, thereby improving measurement efficiency. Continuous scanning is then performed along a preset path to calculate multiple thickness values spatially distributed on the electrode 6. This allows for the collection of thickness data at different locations on the electrode 6 to eliminate single-point measurement errors. Ultimately, the average value is taken to reduce the impact of local deviations on the overall thickness, improving the reliability and accuracy of the measurement results. This achieves the technical effect of not damaging the electrode 6 during the measurement process and improving measurement accuracy and efficiency.

[0047] In order to provide a detailed description of an electronic device for measuring the thickness of a lithium battery electrode provided by the present invention, the above embodiment one provides a detailed description of a method for measuring the thickness of a lithium battery electrode. Based on the same inventive concept, the present application also provides an electronic device for measuring the thickness of a lithium battery electrode 6, see embodiment three for details.

[0048] See Figure 3 , Figure 3 Schematic diagram of an electronic device for measuring the thickness of a lithium battery electrode provided by an embodiment of the present invention. Embodiment 3 of the present invention provides an electronic device for measuring the thickness of a lithium battery electrode, comprising a memory 310, a processor 320, and a computer program 311 stored in the memory 310 and executable on the processor 320. When the processor 320 executes the program, the following steps are implemented:

[0049] S1. Measuring a first displacement value by a first laser displacement sensor 2 located on the upper side of the pole piece 6, where the first displacement value is a distance between the first laser displacement sensor 2 and the upper surface of the pole piece 6;

[0050] S2. Measure a second displacement value using a second laser displacement sensor 3 located on the lower side of the pole piece 6. The laser beam of the second laser displacement sensor 3 is perpendicular to the lower surface of the pole piece 6. The second displacement value is the distance between the second laser displacement sensor 3 and the upper surface of the pole piece 6.

[0051] S3. Calculating a thickness of the pole piece 6 according to a preset spacing value and the measured first displacement value and the second displacement value, wherein the preset spacing value is the spacing between the first laser displacement sensor 2 and the second laser displacement sensor 3;

[0052] S4, repeating S1 to S3, scanning the pole piece 6 with the first laser displacement sensor 2 and the second laser displacement sensor 3 along a preset scanning path to obtain a plurality of thickness values;

[0053] S5. Calculate the average thickness of the electrode 6 according to the obtained multiple thickness values.

[0054] The present invention provides an electronic device for measuring the thickness of a lithium battery pole piece. A first displacement value is measured by a first laser displacement sensor 2 located on the upper side of a pole piece 6, and the first laser displacement sensor 2 is spaced apart from the upper surface of the pole piece 6. The first displacement value is the distance between the first laser displacement sensor 2 and the upper surface of the pole piece 6. A second displacement value is measured by a second laser displacement sensor 3 located on the lower side of the pole piece 6. The second laser displacement sensor 3 is spaced apart from the lower surface of the pole piece 6, and the second laser displacement sensor 3 is directly opposite the first laser displacement sensor 2. The second displacement value is the distance between the second laser displacement sensor 3 and the upper surface of the pole piece 6. The thickness value of the pole piece 6 is calculated based on a preset distance value and the measured first and second displacement values. The preset distance value is the distance between the first laser displacement sensor 2 and the second laser displacement sensor 3. The above steps are repeated to scan the pole piece 6 with the first laser displacement sensor 2 and the second laser displacement sensor 3 along a preset scanning path to obtain multiple thickness values. The average thickness of the pole piece 6 is calculated based on the multiple thickness values obtained. In this way, the thickness detection of the pole piece 6 is achieved through non-contact measurement by the first laser displacement sensor 2 and the second laser displacement sensor 3, avoiding physical damage to the pole piece 6 caused by contact measurement. Through the synchronous measurement of the first laser displacement sensor 2 and the second laser displacement sensor 3 located on the upper and lower sides of the pole piece 6, combined with the preset spacing value, the thickness at the corresponding reflection spot position in the pole piece 6 can be directly calculated to improve the measurement efficiency. Then, continuous scanning is performed along the preset path and multiple thickness values spatially distributed on the pole piece 6 are calculated to collect thickness data at different positions of the pole piece 6 to eliminate single-point measurement errors, and finally the average value is taken to reduce the impact of local deviations on the overall thickness and improve the reliability and accuracy of the measurement results. Thereby, the technical effect of not damaging the pole piece 6 during the measurement process and improving the measurement accuracy and efficiency is achieved.

[0055] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for measuring the thickness of a lithium battery electrode, characterized in that: The method comprises S1. Measuring a first displacement value by a first laser displacement sensor located on an upper side of a pole piece, wherein the first laser displacement sensor is spaced apart from an upper surface of the pole piece, and the first displacement value is a distance between the first laser displacement sensor and the upper surface of the pole piece; S2. Measuring a second displacement value using a second laser displacement sensor located on the underside of the pole piece, wherein the second laser displacement sensor is spaced apart from the lower surface of the pole piece and faces the first laser displacement sensor. The second displacement value is the distance between the second laser displacement sensor and the lower surface of the pole piece. S3. Calculating a thickness of the pole piece according to a preset spacing value and the measured first displacement value and the second displacement value, wherein the preset spacing value is a spacing between the first laser displacement sensor and the second laser displacement sensor; S4, repeating S1 to S3, scanning the pole piece with the first laser displacement sensor and the second laser displacement sensor along a preset scanning path to obtain a plurality of thickness values; S5. Calculate the average thickness of the electrode according to the obtained multiple thickness values.

2. The method for measuring the thickness of a lithium battery electrode according to claim 1, wherein: After S5, the method further includes placing a standard reference block between the first laser displacement sensor and the second laser displacement sensor; measuring a first reference value of the standard reference block by a first laser displacement sensor located on the upper side of the standard reference block, wherein the first reference value is the distance between the first laser displacement sensor and the upper surface of the standard reference block; measuring a second reference value of the standard reference block by a second laser displacement sensor located on the lower side of the standard reference block, wherein the second reference value is the distance between the second laser displacement sensor and the lower surface of the standard reference block; calculating a measured thickness of the standard reference block according to the first reference value and the second reference value; and calculating a compensation coefficient according to ΔT=T1-T2, wherein T1 is the measured thickness, T2 is the standard thickness of the standard reference block, and ΔT is the compensation coefficient.

3. The method for measuring the thickness of a lithium battery electrode according to claim 2, wherein: The difference between the average thickness and the compensation coefficient is used as the actual thickness of the pole piece.

4. The method for measuring the thickness of a lithium battery electrode according to claim 2, wherein: The calculation of the measured thickness of the standard reference block based on the first reference value and the second reference value includes calculating the measured thickness based on T1=T3-(T4+T5), wherein T1 is the measured thickness, T3 is the distance between the first laser displacement sensor located on the upper side of the standard reference block and the second laser displacement sensor located on the lower side of the standard reference block, T4 is the first reference value, and T5 is the second reference value.

5. The method for measuring the thickness of a lithium battery electrode according to claim 1, wherein: The calculation of the thickness value of the pole piece based on the preset spacing value and the measured first displacement value and the second displacement value includes calculating the thickness value of the pole piece based on D=D1-(D2+D3), wherein D is the thickness value of the pole piece, D1 is the preset spacing value, D2 is the first displacement value, and D3 is the second displacement value.

6. The method for measuring the thickness of a lithium battery electrode according to claim 1, wherein: The preset scanning path includes a direction extending along the length of the pole piece.

7. The method for measuring the thickness of a lithium battery electrode according to claim 1, wherein: The calculation of the average thickness of the pole piece based on the obtained multiple thickness values includes d1=(1 / n)*d, where n is the number of the multiple thickness values, d is the sum of the multiple thickness values, and d1 is the average thickness of the pole piece.

8. A device for measuring the thickness of a lithium battery electrode, characterized in that: The device includes a roller assembly, a first laser displacement sensor located on the upper side of the pole piece, a second laser displacement sensor located on the lower side of the pole piece, a first robotic arm connected to the first laser displacement sensor, and a second robotic arm connected to the second laser displacement sensor. The roller assembly is used to transport the pole piece out of the oven, the first laser displacement sensor is used to emit a laser beam vertically into the upper side of the pole piece, and the second laser displacement sensor is used to emit a laser beam vertically into the lower side of the pole piece.

9. The device for measuring the thickness of a lithium battery electrode according to claim 8, characterized in that: The laser beam emitted by the first laser displacement sensor is perpendicular to the upper surface of the pole piece, and the laser beam emitted by the second laser displacement sensor is perpendicular to the lower surface of the pole piece.

10. An electronic device for measuring the thickness of a lithium battery electrode, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the following steps are implemented: S1. Measuring a first displacement value by a first laser displacement sensor located on the upper side of the pole piece, where the first displacement value is the distance between the first laser displacement sensor and the upper surface of the pole piece; S2. Measuring a second displacement value using a second laser displacement sensor located on the lower side of the pole piece, wherein the laser beam of the second laser displacement sensor is perpendicular to the lower surface of the pole piece, and the second displacement value is the distance between the second laser displacement sensor and the upper surface of the pole piece; S3. Calculating a thickness of the pole piece according to a preset spacing value and the measured first displacement value and the second displacement value, wherein the preset spacing value is a spacing between the first laser displacement sensor and the second laser displacement sensor; S4, repeating S1 to S3, scanning the pole piece with the first laser displacement sensor and the second laser displacement sensor along a preset scanning path to obtain a plurality of thickness values; S5. Calculate the average thickness of the electrode according to the obtained multiple thickness values.

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