Thickness measuring device for winding battery cell

Abstract

The utility model provides a thickness measuring device for a winding cell, which comprises a driving platform, a sinking platform and middle rolling grooves, the middle rolling grooves are distributed on two sides of the sinking platform, the middle rolling groove on one side is provided with a winding cell control group, the middle rolling groove on the other side is provided with an inspection group and a magnetic attraction comparison group, the sinking platform is provided with a winding cell test group, and a pressure sensor is arranged in the sinking platform. The roll core testing group comprises a standard thickness measuring group and a contrast thickness measuring group, the standard thickness measuring group is arranged above the sinking table, and the contrast thickness measuring group is arranged above the driving table on one side of the standard thickness measuring group; a connecting plate is arranged between the standard thickness measuring group and the contrast thickness measuring group for synchronous movement; according to the utility model, through three times of thickness measurement in different contact modes, products with unqualified internal process, unqualified side surface process, unqualified conductive process, unqualified coiled electric metal material and unqualified temperature resistance and voltage resistance properties of the battery cell are eliminated at one time, the good product detection effect of the coiled battery cell can be greatly improved, and the device has great progressive significance.

Description

Technical Field

[0001] The utility model relates to the technical field of construction instruments and equipment, in particular to a thickness measuring device for wound battery cells. Background Art

[0002] During the battery core winding process inspection, the thickness of the battery cell needs to be inspected. The battery cells of uniform specifications use methods such as inductive thickness detection and close-type thickness detection to measure the thickness, so as to meet the factory qualified inspection requirements. However, in the rapid development of battery cells, the yield rate produced by this rough method is poor and cannot meet the use requirements of the product. Since the mainstream battery cells are formed by winding, the existing thickness measurement sampling equipment cannot use thickness detection to check the internal structure of the battery cell, winding layers, winding gaps, side bending gaps, temperature resistance, compressive structure strength and other factors that may affect the performance of the battery cell. It cannot guarantee whether the yield rate after the original inspection meets the current use requirements of the battery cell. Its measurement accuracy is poor and comprehensiveness is poor, and it cannot meet the market demand for battery cell use.

[0003] To achieve the above objectives, the present invention provides a thickness measuring device for a wound battery cell, which can solve the problems raised in the above background technology. Utility Model Content

[0004] The utility model adopts the following technical solutions to achieve:

[0005] A thickness measuring device for wound battery cells, comprising a driving platform, a sinking platform and an intermediate rolling groove provided on the driving platform, the intermediate rolling grooves being distributed on both sides of the sinking platform, a winding core control group provided on the intermediate rolling groove on one side, and an inspection group and a magnetic comparison group provided on the intermediate rolling groove on the other side, a winding core test group provided on the sinking platform, and a pressure sensor provided inside the sinking platform;

[0006] The core test group includes a standard thickness measuring group and a control thickness measuring group. The standard thickness measuring group is arranged above the sinking table, and the control thickness measuring group is installed above the driving table on one side of the standard thickness measuring group.

[0007] A connecting plate is provided between the standard thickness measurement group and the control thickness measurement group for synchronous movement;

[0008] A second lateral contrast plate is provided on the side of the magnetic comparison group close to the comparison thickness measurement group, and a first lateral contrast plate is provided on the side of the comparison thickness measurement group.

[0009] Preferably, a load-bearing chain and an auxiliary guide chain are provided inside the middle rolling groove, and the upper ends of the load-bearing chain and the auxiliary guide chain are connected to the top of the sinking table; the conveying direction of the wound battery cell is from the load-bearing chain to the side of the auxiliary guide chain.

[0010] Preferably, the driving ends of the load-bearing chain and the auxiliary guide chain are both provided with side drive motors, the load-bearing chain is provided with multiple load-bearing trays, the wound battery cells are on the load-bearing trays, the side surfaces of the load-bearing chain are provided with side guide blocks, and guide grooves are provided on both sides of the middle rolling groove, and the side guide blocks move inside the guide grooves.

[0011] Preferably, the driving platform is provided with a plurality of adjustment grooves distributed along the middle rolling groove, and a side guide rail 1 and a side guide rail 2 are slidably connected above the adjustment groove, the side guide rail 1 is located on the middle rolling groove on one side close to the winding core control group, and the side guide rail is located on the middle rolling groove on the other side, the side guide rail 1 and the side guide rail 2 are parallel to the middle rolling groove, and an offset group is provided on the side where the two side guide rails 1 are close to each other, and the two offset groups include a plurality of one-way guide piles, and the rotation directions of the two groups of one-way guide piles are opposite;

[0012] Both sides of the side guide rail 1 and the side guide rail 2 are provided with locking piles which are frictionally fixed to the adjustment groove.

[0013] Preferably, the side guide rail 2 is provided with a slot near the comparison thickness measuring group, and two lifting tooth grooves are provided on both sides of the slot. Matching blocks are provided on both sides of the side comparison plate 1 to cooperate with the lifting tooth grooves. One end of the side comparison plate 2 is located in the slot and slides and is provided with a matching block to cooperate with the other lifting tooth groove. The infrared detection end is arranged on the side of the side comparison plate 2 close to the side comparison plate 1.

[0014] Preferably, the core control group includes two groups of control frames, two control scales are provided on the edge of the middle rolling groove on the driving platform, a control processor is fixed between the two control frames, a blank imaging mechanism and a control imaging mechanism are provided on the control frames respectively, and an electromagnetic attraction group is provided below the control processor;

[0015] The control frame includes a transverse movable truss, a movable groove is provided inside the movable truss, and the blank imaging mechanism and the control imaging mechanism slide on both sides of the movable groove.

[0016] Preferably, the inspection group includes a power-on test mechanism and a test port. A sloped guide platform is provided on one side of the sinking platform, and a detection groove is provided inside the sloped guide platform. The test port is located above the detection groove and corresponds one to one. The power-on test mechanism is used to connect the power-on end of the battery cell for testing.

[0017] Preferably, the standard thickness measuring group includes a plurality of fixed columns installed above the sinking platform, a control top plate is provided on the top of the fixed columns, a plurality of movable guide columns are provided downward from the bottom of the control top plate, a main scale and a manual adjustment column are provided above the control top plate, one end of the main scale passes through the control top plate and is vertically fixed to the top of the connecting plate, the manual adjustment column is spirally connected to the control top plate, the bottom of the manual adjustment column is connected to the connecting plate, and the pressure sensor is connected to a warning light.

[0018] Preferably, the inspection group also includes a constant temperature chamber, which is arranged on the side guide rail 2, and the magnetic comparison group is arranged on the material exit side of the constant temperature chamber. The magnetic comparison group includes a fixed frame, and an electromagnet is provided under the fixed frame. A metal positioning block is provided on the driving platform to engage with the electromagnet, and the electromagnet is returned to its original position by a spring at one end close to the fixed frame.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] The utility model measures the thickness of the battery cell three times and realizes the functional item detection of three battery cell thicknesses simultaneously. Firstly, the winding tightness of the battery cell is detected through the first pressing measurement, which can eliminate the problems of poor battery cell density, loose semicircular margin of winding, and uneven density of arc-shaped winding section, and is convenient for detecting the structural winding strength problem inside the wound battery cell; secondly, the thickness of the batch of battery cells with qualified winding structure is detected through the second manual detection to ensure that the thickness of the qualified battery cells in the batch does not have the problem of insufficient overall thickness caused by insufficient winding of layers, large stretching of materials, winding gaps, and unqualified winding methods. Compared with the main scale, the battery cell is qualified when its thickness is within the qualified thickness range; thirdly, the battery cell with a high yield rate is tested. Temperature testing of battery cells can eliminate the phenomenon of uneven temperature resistance and temperature conduction caused by protrusions, burrs, faults and other problems between the internal winding layers, as well as the consequence of this phenomenon causing the battery cell's ignition point to become lower and its temperature resistance to become worse. After the test in a reasonable temperature range, unqualified products with temperature resistance that have bulges, expansion, etc. can be detected in the third fitting height measurement and eliminated by the height difference between the battery cells and the second test. Therefore, through three thickness measurements with different contact methods, products with unqualified internal process, unqualified side process, unqualified conductive process, unqualified winding metal material, and unqualified temperature and pressure resistance properties of the battery cells can be eliminated at one time, which can greatly improve the detection effect of good products of wound battery cells and has great progressive significance.

[0021] Through the coordinated mechanism, a secondary comparison can be carried out quickly, and a variety of unqualified battery cells caused by different reasons can be quickly and conveniently screened out. This can improve the production process level of battery cells and has great progressive significance for the development of the battery industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the distribution of components of the overall structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of each functional component of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the utility model after the synchronous thickness detection part is removed;

[0025] Figure 4 This is a schematic diagram of the track structure distribution of the utility model;

[0026] Figure 5 This is a schematic structural diagram of the corresponding parts of the winding core control group and the driving platform of the present invention;

[0027] Figure 6 This is a schematic diagram of the corresponding structures of the core test group, inspection group and driving platform of the utility model;

[0028] Figure 7 This is a simplified diagram of the three-dimensional structure of the load-bearing chain of the present utility model;

[0029] Figure 8 This is a three-dimensional diagram of the standard thickness measurement group structure of the utility model (briefly shown as the connecting plate).

[0030] In the figure: 1, core control group; 2, core test group; 3, inspection group; 4, drive platform;

[0031] 101. Comparison frame; 102. Bias group; 103. Comparison scale; 104. Blank imaging mechanism; 105. Comparison imaging mechanism; 106. Electromagnetic attraction group; 107. Comparison processor; 108. Movable truss; 109. Movable slot; 110. Locking post; 111. Side guide rail 1; 112. One-way guide post; 113. Side guide rail 2;

[0032] 201. Standard thickness measurement set; 202. Comparison thickness measurement set; 203. Comparison top plate; 204. Movable guide column; 205. Connecting plate; 206. Fixed column; 207. Main scale; 208. Manual adjustment column; 209. Lateral comparison plate 1;

[0033] 210, magnetic comparison group; 211, electromagnet; 213, fixing frame;

[0034] 214, lifting tooth groove; 215, lateral comparison plate 2;

[0035] 301, test port; 302, power-on test mechanism; 303, constant temperature chamber;

[0036] 401. Pressure sensor; 402. Warning light; 403. Middle rolling groove; 404. Side drive motor; 405. Load-bearing chain; 406. Load-bearing tray; 407. Side guide block; 408. Auxiliary guide chain; 409. Adjustment groove; 410. Sinking table; 411. Inclined guide table; 412. Detection groove. DETAILED DESCRIPTION

[0037] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings, but the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0038] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly used by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0040] The present invention will be described in further detail below with reference to the accompanying drawings.

[0041] The specific implementation method of measuring the thickness of the battery cell in the utility model is as follows. Please refer to the attached Figure 1-3 、 Figure 7 、 Figure 8 , including a driving platform 4, on which a sinking platform 410 and an intermediate rolling groove 403 are provided. The intermediate rolling grooves 403 are distributed on both sides of the sinking platform 410, and a core control group 1 is provided on the intermediate rolling groove 403 on one side, and an inspection group 3 and a magnetic comparison group 210 are provided on the intermediate rolling groove 403 on the other side. A core test group 2 is provided on the sinking platform 410, and a pressure sensor 401 is provided inside the sinking platform 410;

[0042] The core test group 2 includes a standard thickness measurement group 201 and a control thickness measurement group 202. The standard thickness measurement group 201 is arranged above the sinking platform 410, and the control thickness measurement group 202 is installed above the driving platform 4 on one side of the standard thickness measurement group 201.

[0043] A connecting plate 205 is provided between the standard thickness measurement group 201 and the reference thickness measurement group 202 for synchronous movement;

[0044] The magnetic comparison group 210 is provided with a second lateral comparison plate 215 on the side close to the comparison thickness measurement group 202 . The comparison thickness measurement group 202 is provided with a first lateral comparison plate 209 on the side. An infrared detection end 216 is provided on one side of the second lateral comparison plate 215 .

[0045] When measuring the thickness of battery cells, this device uses the following steps to perform S1, random inspection of battery cells: the randomly inspected battery cells are placed in batches into the middle rolling groove 403 for chain conveying, and the battery cells are placed into the carrying tray 406. This process can be completed manually or filled by another conveyor-type device. The side drive motor 404 is a single equidistant conveying, and the single drive gear drives the chain to rotate. Its frequency can be controlled by the manual thickness measuring end. One control method is that after the standard thickness measuring group 201 tests a set of standard data downward, the comparison with the magnetic comparison group 210 is completed. After no alarm occurs or an alarm occurs, the motor rotates to drive the load-bearing chain 405 to rotate. The force-bearing end of the load-bearing chain 405 is dispersed through the side guide block 407 and the guide groove 413. The distance of a single movement is as follows Figure 7 , the running distance from the receiving plate of the upper-level carrying tray 406 to the receiving plate of the lower-level carrying tray is a single moving distance, and the spacing between the two carrying trays 406 can be controlled by the positioning spacing of the blank imaging mechanism 104, the electromagnetic attraction group 106, and the comparison imaging mechanism 105. Conversely, the identification spacing between the blank imaging mechanism 104, the electromagnetic attraction group 106, and the comparison imaging mechanism 105 can also be changed according to the carrying tray 406. During the transportation process, the non-aligned part of the edge of the battery cell contacts the bias group 102 for sorting and returning to its position. The wound battery cell that does not completely enter the range of the carrying tray 406 will transmit the contact force due to the unidirectional rotation of the two sides of the bias group 102, so that the battery cell is aligned in the carrying tray 406, which is convenient for comparing and observing the numerical changes of the comparison scale 103;

[0046] S2. Deformation verification: The blank imaging mechanism 104 takes an image of the battery cell passing below, transports it to the electromagnetic attraction group 106 for pressing, and then takes a second image through the comparison imaging mechanism 105. The comparison processor 107 compares the two images with respect to the scale difference on the comparison drive table 4. The recognition gap between the blank imaging mechanism 104, the comparison imaging mechanism 105, and the electromagnetic attraction group 106 is set to the conveying distance of three rotations of the side drive motor 404. The length of the three conveying distances can be set according to the spacing between the carrying trays 406 and the rotation diameter of the side drive motor 404. The conveying frequency is changed according to the thickness measurement evaluation rate of the standard thickness measurement group 201.

[0047] S3, power-on verification of defective products: Cells with a large difference in width between the two imaging sides are randomly inspected and placed in the test port 301 to check for damage. A large difference in width between the two imaging sides indicates that they were over-extruded during the S2 process. They may have multiple undesirable factors such as dense winding, excessive winding gap, and insufficient bending surface strength. Power-on testing is performed to observe whether there are any undesirable electrical properties. Qualified products that can be used can still be used for the next level of thickness measurement. Unqualified products indicate that their structural strength is insufficient to meet the pressure resistance requirements of ordinary cells and their electrical properties are unstable, so they cannot be loaded into the cladding for use.

[0048] S4. Comparison of winding core thickness: The cells with qualified comparison imaging spacing in step S2 are manually calibrated to measure their thickness when the pressure sensor 401 is set to meet the requirements. The cells are then transferred to the intermediate rolling groove 403 chain for conveyance in the next stage. The new stage products are calibrated to test their qualified thickness under close pressure. If the thickness falls within the qualified range, the product is good. If it does not fall within the range, the product is a poor-quality product with stable structure and electrical properties, but insufficient winding density or excessive elongation of the winding steel.

[0049] S5. Comparison of heat-resistant thickness: Use the constant temperature chamber 303 in the inspection group 3 to set an independent temperature zone, use the magnetic comparison group 210 to measure the thickness of the battery cell, and compare the thickness of the side comparison plate 1 209 with the side comparison plate 2 215 in step S4. If the two comparison thicknesses are different, it means that there are unreasonable coiling or overlapping windings and burrs and protrusions inside, which lead to uneven heat conduction of the wound battery cell and bulging. This is a defective product. Performing temperature testing on the battery cell with a high yield rate can rule out the problem of heat resistance caused by protrusions, burrs, faults, etc. between the internal winding layers. The phenomenon of uneven temperature and the consequence of this phenomenon that the ignition point of the battery cell becomes lower and the temperature resistance becomes worse, the heat-resistant unqualified products that have bulging, expansion, etc. after the test in a reasonable temperature range can be detected in the third bonding height measurement and the height difference between the battery cell and the second test and eliminated. Therefore, through three thickness measurements with different contact methods, the products with unqualified internal process, unqualified side process, unqualified conductive process, unqualified winding metal material, and unqualified heat and pressure resistance properties of the battery cell can be eliminated at one time, which can greatly improve the good product detection effect of the wound battery cell and has great progressive significance.

[0050] In one embodiment of the present invention:

[0051] Please pay attention to Figure 1 、 Figure 4-Figure 6The driving ends of the load-bearing chain 405 and the auxiliary guide chain 408 are both provided with side drive motors 404. The driving ends of the drive motors are connected to the inner side of the load-bearing chain 405 through gears to ensure the stability of the transmission. The load-bearing chain 405 is provided with multiple load trays 406. The wound battery cells are on the load trays 406. The sides of the load-bearing chain 405 are provided with side guide blocks 407. Guide grooves 413 are provided on both sides of the middle rolling groove 403. The side guide blocks 407 move inside the guide grooves 413.

[0052] The driving platform 4 is provided with a plurality of adjustment grooves 409 distributed along the middle rolling groove 403. The adjustment grooves 409 are used to facilitate adjustment of the spacing between the guide rails 1 111 and the side guide rails 2 113 on both sides, so as to reduce the offset problem between the wound battery cell and the carrying tray 406. The side guide rails 1 111 and the side guide rails 2 113 are slidably connected above the adjustment grooves 409. The side guide rail 1 111 is located on the middle rolling groove 403 on one side close to the winding core control group 1, and the side guide rails are located on the middle rolling groove 403 on the other side. The side guide rail 1 111 and the side guide rail 2 113 are parallel to the middle rolling groove 403. A bias group 102 is provided on the side where the two side guide rails 111 are close to each other. The two bias groups 102 include a plurality of one-way guide piles 112, and the rotation directions of the two groups of one-way guide piles 112 are opposite.

[0053] Both sides of the side guide rail 111 and the side guide rail 2 113 are provided with locking piles 110 and frictionally fixed with the adjustment slot 409. The locking piles are used to offset the lateral squeezing force between the bias group 102 and the battery cell, thereby making the side guide rail 111 and the side guide rail 2 113 move unbalanced.

[0054] In another embodiment of the present invention: Please refer to Figure 1-Figure 5 , the driving platform 4 is provided with a plurality of adjustment grooves 409 distributed along the middle rolling groove 403, and a side guide rail 1 111 and a side guide rail 2 113 are slidably connected above the adjustment groove 409, the side guide rail 1 111 is located on the middle rolling groove 403 on one side close to the winding core control group 1, and the side guide rail is located on the middle rolling groove 403 on the other side, the side guide rail 1 111 and the side guide rail 2 113 are parallel to the middle rolling groove 403, and a bias group 102 is provided on the side where the two side guide rails 111 are close to each other, and the two bias groups 102 include a plurality of one-way guide piles 112, and the rotation directions of the two groups of one-way guide piles 112 are opposite;

[0055] Both sides of the side guide rail 111 and the side guide rail 2 113 are provided with locking piles 110 which are frictionally fixed to the adjustment slot 409;

[0056] The second side guide rail 113 is provided with a slot near the comparison thickness measurement group 202, and two lifting tooth grooves 214 are provided on both sides of the slot. The two sides of the side comparison plate 1 209 are provided with matching blocks that cooperate with the lifting tooth grooves. One end of the second side comparison plate 215 slides inside the slot and is provided with a matching block that cooperates with the other lifting tooth groove. The infrared detection end 216 is provided on the side of the second side comparison plate 215 near the side comparison plate 1 209;

[0057] Another embodiment is as follows: the inspection group 3 also includes a constant temperature chamber 303, the constant temperature chamber 303 is arranged on the side guide rail 2 113, the magnetic comparison group 210 is arranged on the material exit side of the constant temperature chamber 303, the magnetic comparison group 210 includes a fixing frame 213, an electromagnet 211 is provided under the fixing frame 213, a metal positioning block is provided on the driving platform 4 and is attracted to the electromagnet 211, and the end of the electromagnet 211 close to the fixing frame 213 is returned to its original position by a spring.

[0058] In another embodiment of the present invention: Please refer to Figure 1 、 Figure 4-Figure 8 The core control group 1 includes two groups of control frames 101. Two control scales 103 are provided on the driving platform 4 along the edge of the middle rolling groove 403. A control processor 107 is fixed between the two control frames 101. The control frames 101 are respectively provided with a blank imaging mechanism 104 and a control imaging mechanism 105. An electromagnetic attraction group 106 is provided below the control processor 107.

[0059] The comparison frame 101 includes a horizontal movable truss 108, and a movable groove 109 is provided inside the movable truss 108. The blank imaging mechanism 104 and the comparison imaging mechanism 105 slide on both sides of the movable groove 109. The sliding adjustment is mainly used to balance the influence of the two guide rails on the position of the battery cell so as to obtain a better photographic comparison with the actual image of the ruler.

[0060] Please pay attention to Figure 1-4 The inspection group 3 includes a power-on test mechanism 302 and a test port 301. A slanted guide platform 411 is provided on one side of the sinking platform 410. A detection groove 412 is provided inside the slanted guide platform 411. The test port 301 is located above the detection groove 412 and corresponds one to one. The power-on test mechanism 302 is used to connect the power-on end of the battery cell for testing.

[0061] Please pay attention to Figure 5 、 Figure 6, the standard thickness measuring group 201 includes a plurality of fixed columns 206 installed above the sinking platform 410, the top of the fixed column 206 is provided with a control top plate 203, and the bottom of the control top plate 203 is provided with a plurality of movable guide columns 204 downwardly, and a main scale 207 and a hand-adjustable rotary column 208 are provided above the control top plate 203, one end of the main scale 207 passes through the control top plate 203 and is vertically fixed to the top of the connecting plate 205, the hand-adjustable rotary column 208 is spirally connected to the control top plate 203, and the bottom of the hand-adjustable rotary column 208 is connected to the connecting plate 205, and the pressure sensor 401 is connected to a warning light 402. Through the second manual inspection, the thickness of the batch of battery cells whose winding structure has passed the inspection is checked to ensure that the thickness of the qualified battery cells in this batch does not have the problem of insufficient overall thickness caused by insufficient winding of layers, large material stretching, winding gaps, and unqualified winding methods. Compared with the main scale 207, the battery cell is qualified when its thickness is within the qualified thickness range.

[0062] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0063] The above content is merely an example and explanation of the structure of the present utility model. Technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the scope of protection of the present utility model.

Claims

1. A thickness measuring device for a wound battery cell, characterized in that: The invention comprises a driving platform (4), wherein a sinking platform (410) and an intermediate rolling groove (403) are provided on the driving platform (4), wherein the intermediate rolling groove (403) is distributed on both sides of the sinking platform (410), a core control group (1) is provided on the intermediate rolling groove (403) on one side, and an inspection group (3) and a magnetic comparison group (210) are provided on the intermediate rolling groove (403) on the other side, a core test group (2) is provided on the sinking platform (410), and a pressure sensor (401) is provided inside the sinking platform (410); The core test group (2) includes a standard thickness measurement group (201) and a comparison thickness measurement group (202), wherein the standard thickness measurement group (201) is arranged above the sinking platform (410), and the comparison thickness measurement group (202) is installed above a driving platform (4) on one side of the standard thickness measurement group (201); A connecting plate (205) is provided between the standard thickness measurement group (201) and the control thickness measurement group (202) for synchronous movement; The magnetic comparison group (210) is provided with a second lateral comparison plate (215) on one side close to the comparison thickness measurement group (202), and the comparison thickness measurement group (202) is provided with a first lateral comparison plate (209) on one side.

2. The thickness measuring device for a wound battery cell according to claim 1, characterized in that: A load-bearing chain (405) and an auxiliary guide chain (408) are provided inside the middle rolling groove (403); the upper ends of the load-bearing chain (405) and the auxiliary guide chain (408) are both connected to the upper side of the sinking platform (410); and the conveying direction of the wound battery cell is from the load-bearing chain (405) to the side of the auxiliary guide chain (408).

3. The thickness measuring device for a wound battery cell according to claim 2, characterized in that: The driving ends of the load-bearing chain (405) and the auxiliary guide chain (408) are both provided with side drive motors (404); a plurality of load-bearing trays (406) are provided on the load-bearing chain (405); the wound battery cells are mounted on the load-bearing trays (406); side guide blocks (407) are provided on the sides of the load-bearing chain (405); guide grooves (413) are provided on both sides of the interior of the middle rolling groove (403); and the side guide blocks (407) are movable inside the guide grooves (413).

4. The thickness measuring device for a wound battery cell according to claim 1, characterized in that: The driving platform (4) is provided with a plurality of adjustment grooves (409) distributed along the middle rolling groove (403), and a side guide rail (111) and a side guide rail (113) are slidably connected above the adjustment groove (409), the side guide rail (111) is located on the middle rolling groove (403) on one side close to the winding core control group (1), and the side guide rail (2) is located on the middle rolling groove (403) on the other side, the side guide rail (111) and the side guide rail (113) are parallel to the middle rolling groove (403), and a bias group (102) is provided on the side where the two side guide rails (111) are close to each other, and the two bias groups (102) include a plurality of one-way guide piles (112), and the rotation directions of the two groups of one-way guide piles (112) are opposite; Both sides of the side guide rail 1 (111) and the side guide rail 2 (113) are provided with locking piles (110) which are frictionally fixed with the adjustment groove (409).

5. The thickness measuring device for a wound battery cell according to claim 4, characterized in that: The side guide rail 2 (113) is provided with a slot near the comparison thickness measurement group (202), and two lifting tooth grooves (214) are provided on both sides of the slot. The two sides of the side comparison plate 1 (209) are provided with matching blocks that match the lifting tooth grooves. One end of the side comparison plate 2 (215) is located inside the slot and slides and is provided with a matching block that matches the other lifting tooth groove.

6. The thickness measuring device for a wound battery cell according to claim 1, characterized in that: The core control group (1) comprises two groups of control frames (101), two control scales (103) are provided on the driving platform (4) along the edge of the middle rolling groove (403), a control processor (107) is fixed between the two control frames (101), a blank imaging mechanism (104) and a control imaging mechanism (105) are provided on the control frames (101), and an electromagnetic attraction group (106) is provided below the control processor (107); The control frame (101) includes a horizontal movable truss (108), a movable groove (109) is provided inside the movable truss (108), and the blank imaging mechanism (104) and the control imaging mechanism (105) are located on both sides of the movable groove (109) and slide.

7. The thickness measuring device for a wound battery cell according to claim 1, characterized in that: The inspection group (3) comprises an energized test mechanism (302) and a test port (301); a slanted guide platform (411) is provided on one side of the sinking platform (410); a detection groove (412) is provided inside the slanted guide platform (411); the test ports (301) are located above the detection groove (412) and correspond one to one; the energized test mechanism (302) is used to connect to the energized end of the battery cell for testing.

8. The thickness measuring device for a wound battery cell according to claim 1, characterized in that: The standard thickness measurement group (201) includes a plurality of fixed columns (206) installed above the sinking platform (410), a reference top plate (203) is provided on the top of the fixed columns (206), a plurality of movable guide columns (204) are provided downwardly from the bottom of the reference top plate (203), a main scale (207) and a manual adjustment column (208) are provided above the reference top plate (203), one end of the main scale (207) passes through the reference top plate (203) and is vertically fixed to the top of the connecting plate (205), the manual adjustment column (208) is spirally connected to the reference top plate (203), the bottom of the manual adjustment column (208) is connected to the connecting plate (205), and the pressure sensor (401) is connected to a warning light (402).

9. The thickness measuring device for a wound battery cell according to claim 4, characterized in that: The inspection group (3) further comprises a constant temperature chamber (303), the constant temperature chamber (303) being arranged on the second side guide rail (113), the magnetic attraction comparison group (210) being arranged on the material exit side of the constant temperature chamber (303), the magnetic attraction comparison group (210) comprising a fixing frame (213), an electromagnet (211) being arranged below the fixing frame (213), a metal positioning block being arranged on the driving platform (4) and correspondingly engaging with the electromagnet (211), and the end of the electromagnet (211) close to the fixing frame (213) being returned to its original position by a spring.

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