Detection device for avoiding dislocation of winding tab

Abstract

The detection device comprises a negative electrode thickness detection mechanism arranged along a detection path of a negative electrode plate, a positive electrode thickness detection mechanism arranged along a detection path of a positive electrode plate, and a variable-winding-diameter winding needle arranged along a winding path of the negative electrode plate and the positive electrode plate, wherein the negative electrode thickness detection mechanism and the positive electrode thickness detection mechanism are used for detecting the thicknesses of a negative electrode plate and a positive electrode plate through different rays respectively, and the variable-rolling-diameter rolling needle is used for rolling the negative electrode plate and the positive electrode plate into a battery cell and adjusting the rolling diameter of the battery cell in real time according to the thicknesses of the negative electrode plate and the positive electrode plate to prevent tabs of the positive electrode plate and tabs of the negative electrode plate from being staggered; the thickness of the negative plate and the thickness of the positive plate are respectively detected by the positive electrode thickness detection mechanism and the negative electrode thickness detection mechanism, and then real-time adjustment is carried out through the variable-rolling-diameter rolling needle, so that the condition that tabs are misplaced can be avoided, and the processing efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of electrode detection technology, and in particular to a detection device for avoiding misalignment of the wound electrode tab. Background Technology

[0002] In existing battery cell winding equipment, abnormal fluctuations in the thickness of the cathode and anode plates can easily lead to misalignment of the tabs, resulting in scrapped battery cells. The existing technology for solving this problem relies on manual intervention and adjustment during machine shutdown, which cannot achieve real-time monitoring and proactive prevention, resulting in low production efficiency and insufficient pass rate. Utility Model Content

[0003] To address the problem of ear misalignment caused by abnormal fluctuations in the thickness of the anode and cathode plates, this invention proposes a detection device to avoid ear misalignment during winding.

[0004] This utility model is achieved through the following technical solution:

[0005] This utility model proposes a detection device to avoid misalignment of the wound electrode tabs, comprising a negative electrode thickness detection mechanism arranged along the detection path of the negative electrode sheet, a positive electrode thickness detection mechanism arranged along the detection path of the positive electrode sheet, and a variable diameter winding needle arranged along the winding paths of the negative and positive electrode sheets, wherein:

[0006] The negative electrode thickness detection mechanism and the positive electrode thickness detection mechanism are used to detect the thickness of the negative electrode sheet and the positive electrode sheet respectively using different rays. The variable diameter winding needle is used to wind the negative electrode sheet and the positive electrode sheet into a battery cell and adjust the battery cell winding diameter in real time according to the thickness of the negative electrode sheet and the positive electrode sheet to prevent the tabs of the positive electrode sheet and the tabs of the negative electrode sheet from being misaligned.

[0007] Furthermore, it also includes a host computer control module, which is used to receive real-time data from the negative electrode thickness detection mechanism and the positive electrode thickness detection mechanism and output a winding needle adjustment signal. The host computer control module is electrically connected to the negative electrode thickness detection mechanism, the positive electrode thickness detection mechanism and the variable diameter winding needle.

[0008] Furthermore, the negative electrode thickness detection mechanism includes a negative electrode radiation detector and a negative electrode radiation source, which are disposed opposite to each other at both ends of the negative electrode sheet.

[0009] Furthermore, the negative electrode thickness detection mechanism also includes a negative electrode detection outer cover and a negative electrode detection protective layer. The negative electrode detection outer cover is disposed on the outside of the negative electrode detection protective layer, and the inside of the negative electrode detection protective layer is used to pass through and detect the negative electrode sheet.

[0010] Furthermore, the negative electrode thickness detection mechanism uses X-rays as the radiation source for detection.

[0011] Furthermore, the positive electrode thickness detection mechanism includes a positive electrode radiation detector and a positive electrode radiation source, which are disposed opposite to each other at both ends of the positive electrode sheet.

[0012] Furthermore, the positive electrode thickness detection mechanism also includes a positive electrode detection outer cover and a positive electrode detection protective layer. The positive electrode detection outer cover is disposed on the outside of the positive electrode detection protective layer, and the inside of the positive electrode detection protective layer is used to pass through and detect the positive electrode sheet.

[0013] Furthermore, the positive electrode thickness detection mechanism uses beta rays as the radiation source for detection.

[0014] The beneficial effects of this utility model are:

[0015] (1) The detection device for avoiding misalignment of the winding tabs proposed in this utility model uses a positive electrode thickness detection mechanism and a negative electrode thickness detection mechanism to detect the thickness of the negative electrode sheet and the positive electrode sheet respectively, and then makes real-time adjustments through a variable diameter winding needle, which can avoid misalignment of the tabs and improve processing efficiency.

[0016] (2) The detection device for avoiding misalignment of the winding tabs proposed in this utility model uses two different rays and through dual-ray differential detection technology, it can solve the problem of detection error caused by the difference in physical properties of anode and cathode materials.

[0017] (3) The detection device for avoiding misalignment of the winding tab proposed in this utility model analyzes the thickness fluctuation through the upper computer preset algorithm, generates the roll diameter adjustment command and sends it to the variable roll diameter winding needle, so that the roll diameter and the thickness of the electrode sheet are matched in real time. This can avoid the misalignment of the tab and also be compatible with electrode sheets of different specifications through different algorithms. Attached Figure Description

[0018] Figure 1 The circuit diagram is for the detection device of this utility model that avoids misalignment of the wound tab;

[0019] Figure 2 This is a module division diagram of the detection device for avoiding misalignment of the wound electrode tabs according to this utility model;

[0020] Figure 3 This utility model provides a detection device to prevent misalignment of the wound electrode tabs.

[0021] Figure 4 This refers to the misalignment of the battery cell on a variable diameter winding needle.

[0022] Figure 5 This is a schematic diagram of a misaligned battery cell.

[0023] Figure 6 This is a schematic diagram of a normal battery cell;

[0024] In the figure: negative electrode thickness detection mechanism 1, negative electrode radiation detector 11, negative electrode radiation source 12, negative electrode detection outer cover 13, negative electrode detection protective layer 14, positive electrode thickness detection mechanism 2, variable diameter winding needle 3, battery cell 4, positive electrode sheet 5, negative electrode sheet 6, upper diaphragm 7, lower diaphragm 8, negative electrode tab 9, positive electrode tab 10.

[0025] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] To more clearly and completely illustrate the technical solution of this utility model, the following description, in conjunction with the accompanying drawings, will further explain this utility model.

[0027] Please refer to Figures 1-6 This utility model proposes a detection device to avoid misalignment of the wound electrode tabs, comprising a negative electrode thickness detection mechanism 1 arranged along the detection path of the negative electrode sheet 6, a positive electrode thickness detection mechanism 2 arranged along the detection path of the positive electrode sheet 5, and a variable diameter winding needle 3 arranged along the winding paths of the negative electrode sheet 6 and the positive electrode sheet 5, wherein:

[0028] The negative electrode thickness detection mechanism 1 and the positive electrode thickness detection mechanism 2 are used to detect the thickness of the negative electrode sheet 6 and the positive electrode sheet 5 respectively through different rays. The variable diameter winding needle 3 is used to wind the negative electrode sheet 6 and the positive electrode sheet 5 into a battery cell 4 and adjust the winding diameter of the battery cell 4 in real time according to the thickness of the negative electrode sheet 6 and the positive electrode sheet 5 to prevent the tabs of the positive electrode sheet 5 and the tabs of the negative electrode sheet 6 from being misaligned.

[0029] In a specific implementation, the negative electrode thickness detection mechanism 1 and the positive electrode thickness detection mechanism 2 respectively detect the thickness of the positive electrode sheet 5 and the negative electrode sheet 6. After detection, the negative electrode sheet 6 and the positive electrode sheet 5 are converged with the upper separator 7 and the lower separator 8 and wound into a battery cell 4 by a variable diameter winding needle 3. At the same time, the winding diameter of the battery cell 4 is controlled so that the winding diameter matches the thickness of the negative electrode sheet 6 and the positive electrode sheet 5 in real time, preventing misalignment of the positive electrode tab 10 and the negative electrode tab 9.

[0030] Furthermore, it also includes a host computer control module, which is used to receive real-time data from the negative electrode thickness detection mechanism 1 and the positive electrode thickness detection mechanism 2 and output the winding needle adjustment signal. The host computer control module is electrically connected to the negative electrode thickness detection mechanism 1, the positive electrode thickness detection mechanism 2 and the variable diameter winding needle 3.

[0031] In a specific implementation, the host computer establishes a roll diameter compensation algorithm based on the thickness data to analyze the thickness fluctuation, and then generates a roll diameter adjustment command and sends it to the variable roll diameter needle 3. After receiving the command, the variable roll diameter needle 3 adjusts the roll diameter in real time to match the thickness of the positive electrode 5 and the negative electrode 6 to prevent the tabs from being misaligned.

[0032] Furthermore, the negative electrode thickness detection mechanism 1 includes a negative electrode radiation detector 11 and a negative electrode radiation source 12, which are disposed opposite to each other at both ends of the negative electrode sheet 6.

[0033] In a specific embodiment, the negative polarization radiation source 12 is used to emit radiation, and the negative polarization radiation detector 11 is used to receive radiation. The radiation emitted by the negative polarization radiation source 12 passes through the electrode plate and is received by the negative polarization radiation detector 11 for testing.

[0034] Furthermore, the negative electrode thickness detection mechanism 1 also includes a negative electrode detection outer cover 13 and a negative electrode detection protective layer 14. The negative electrode detection outer cover 13 is disposed on the outside of the negative electrode detection protective layer 14, and the inside of the negative electrode detection protective layer 14 is used to pass through and detect the negative electrode sheet 6.

[0035] In a specific embodiment, the negative electrode detection outer cover 13 and the negative electrode detection protective layer 14 are used to prevent leakage of the negative electrode radiation source 12. The negative electrode radiation detector 11 and the negative electrode radiation source 12 are set inside the protective layer, and an outer cover is set outside the protective layer to prevent it from affecting the outside.

[0036] Furthermore, the negative electrode thickness detection mechanism 1 uses X-rays as the radiation source for detection.

[0037] In a specific implementation, X-rays have better penetrability to low-density cathode materials, which can ensure detection accuracy.

[0038] Furthermore, the positive electrode thickness detection mechanism 2 includes a positive electrode radiation detector and a positive electrode radiation source, which are disposed opposite to each other at both ends of the positive electrode sheet 5.

[0039] In a specific implementation, the structure of the positive electrode thickness detection mechanism 2 is exactly the same as that of the negative electrode thickness detection mechanism 1. The difference between the two is that the radiation source is different. The positive electrode radiation source emits rays that pass through the positive electrode sheet 5 and are received by the positive electrode radiation detector.

[0040] Furthermore, the positive electrode thickness detection mechanism 2 also includes a positive electrode detection outer cover and a positive electrode detection protective layer. The positive electrode detection outer cover is located on the outside of the positive electrode detection protective layer, and the inside of the positive electrode detection protective layer is used to pass through and detect the positive electrode sheet 5.

[0041] In a specific implementation, the positive electrode thickness detection mechanism 2 also includes a positive electrode detection outer cover and a positive electrode detection protective layer to prevent the positive electrode radiation source from affecting the outside.

[0042] Furthermore, the positive electrode thickness detection mechanism 2 uses beta rays as the radiation source for detection.

[0043] In a specific embodiment, the mass absorption coefficient of the anode copper foil for β-rays is significantly higher than that of the carbon-based cathode material. This makes it possible to improve the sensitivity of anode thickness detection by using β-rays as the radiation source. This invention utilizes two different types of rays and, through dual-ray differential detection technology, can solve the problem of detection errors caused by the differences in the physical properties of anode and cathode materials.

[0044] Of course, there may be other implementations of this utility model. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of this utility model.

Claims

1. A detection device for avoiding misalignment of wound tabs, characterized in that, It includes a negative electrode thickness detection mechanism arranged along the detection path of the negative electrode sheet, a positive electrode thickness detection mechanism arranged along the detection path of the positive electrode sheet, and a variable diameter winding needle arranged along the winding paths of the negative and positive electrode sheets, wherein: The negative electrode thickness detection mechanism and the positive electrode thickness detection mechanism are used to detect the thickness of the negative electrode sheet and the positive electrode sheet respectively using different rays. The variable diameter winding needle is used to wind the negative electrode sheet and the positive electrode sheet into a battery cell and adjust the battery cell winding diameter in real time according to the thickness of the negative electrode sheet and the positive electrode sheet to prevent the tabs of the positive electrode sheet and the tabs of the negative electrode sheet from being misaligned.

2. The detection device for avoiding misalignment of the wound tab according to claim 1, characterized in that, It also includes a host computer control module, which is used to receive real-time data from the negative electrode thickness detection mechanism and the positive electrode thickness detection mechanism and output a winding needle adjustment signal. The host computer control module is electrically connected to the negative electrode thickness detection mechanism, the positive electrode thickness detection mechanism and the variable diameter winding needle.

3. The detection device for avoiding misalignment of the wound electrode tab according to claim 2, characterized in that, The negative electrode thickness detection mechanism includes a negative electrode radiation detector and a negative electrode radiation source, which are disposed opposite to each other at both ends of the negative electrode sheet.

4. The detection device for avoiding misalignment of the wound electrode tab according to claim 3, characterized in that, The negative electrode thickness detection mechanism also includes a negative electrode detection outer cover and a negative electrode detection protective layer. The negative electrode detection outer cover is disposed on the outside of the negative electrode detection protective layer, and the inside of the negative electrode detection protective layer is used to pass through and detect the negative electrode sheet.

5. The detection device for avoiding misalignment of the wound electrode tab according to claim 4, characterized in that, The negative electrode thickness detection mechanism uses X-rays as the radiation source for detection.

6. The detection device for avoiding misalignment of the wound tab according to claim 1, characterized in that, The positive electrode thickness detection mechanism includes a positive electrode radiation detector and a positive electrode radiation source, which are disposed opposite to each other at both ends of the positive electrode sheet.

7. The detection device for avoiding misalignment of the wound electrode tab according to claim 6, characterized in that, The positive electrode thickness detection mechanism also includes a positive electrode detection outer cover and a positive electrode detection protective layer. The positive electrode detection outer cover is disposed on the outside of the positive electrode detection protective layer, and the inside of the positive electrode detection protective layer is used to pass through and detect the positive electrode sheet.

8. The detection device for avoiding misalignment of the wound tab according to claim 7, characterized in that, The positive electrode thickness detection mechanism uses beta rays as the radiation source for detection.

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