Thickness measuring device and thickness measuring method for winding battery cell

Abstract

The invention provides a thickness measuring device and a thickness measuring method for a winding battery cell, the thickness measuring device comprises a driving platform, a sinking platform and middle rolling grooves, the middle rolling grooves are distributed at two sides of the sinking platform, the middle rolling groove at one side is provided with a winding cell control group, the middle rolling groove at 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 the magnetic attraction comparison group is provided with a magnetic attraction comparison group. A pressure sensor is arranged in the sinking table; 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 invention, through three times of thickness measurement in different contact modes, products with unqualified internal process, unqualified side 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, so that the good product detection effect of the coiled battery cell can be greatly improved, and great progressive significance is achieved.

Description

Technical Field

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

[0002] When inspecting the battery core winding process, the thickness of the battery cell needs to be tested. The battery cells of uniform specifications use methods such as inductive thickness detection and close-proximity 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 and a thickness measuring method for a wound battery cell, which can solve the problems raised in the above background technology. Summary of the invention

[0004] The present invention adopts the following technical solutions to achieve:

[0005] A thickness measuring device and thickness measuring method for a wound battery core, comprising a driving platform, a sinking platform and an intermediate rolling groove are arranged on the driving platform, the intermediate rolling grooves are distributed on both sides of the sinking platform, a winding core control group is arranged on the intermediate rolling groove on one side, and an inspection group and a magnetic attraction comparison group are arranged on the intermediate rolling groove on the other side, a winding core test group is arranged on the sinking platform, and a pressure sensor is arranged 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 a 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] The magnetic comparison group is provided with a lateral comparison plate 2 on one side close to the comparison thickness measurement group, the comparison thickness measurement group is provided with a lateral comparison plate 1 on one side, and an infrared detection end is provided on one side of the lateral comparison plate 2.

[0009] Preferably, a load-bearing chain and an auxiliary guide chain are arranged 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 auxiliary guide chain side.

[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 sides 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 grooves.

[0013] Preferably, the side guide rail 2 is provided with a slot near the comparison thickness measuring group, two lifting ruler slots are provided on both sides of the slot, matching blocks are provided on both sides of the side comparison plate 1 to match the lifting tooth slots, one end of the side comparison plate 2 is located in the slot for sliding and is provided with a matching block to match the other lifting tooth slot, and 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 driving platform along the edge of the middle rolling groove, 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 suction group is provided below the control processor;

[0015] The control frame comprises a transverse movable truss, a movable groove is arranged inside the movable truss, and the blank imaging mechanism and the control imaging mechanism slide on the temporal part of the movable groove at both sides.

[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, a detection groove is provided inside the sloped guide platform, the test port is located above the detection groove and corresponds one to one, and 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 reference 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 reference top plate, a main scale and a manual adjustment column are provided above the reference top plate, one end of the main scale passes through the reference top plate and is vertically fixed to the top of the connecting plate, the manual adjustment column is spirally connected to the reference 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 second side guide rail, 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, an electromagnet is arranged under the fixed frame, and a metal positioning block is provided on the driving platform to correspond to the electromagnet, and the end of the electromagnet close to the fixed frame is returned to its original position by a spring.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention measures the thickness of the battery cell three times to achieve simultaneous detection of three functional items of battery cell thickness. First, through the first compression measurement, the winding tightness of the battery cell is detected, which can eliminate the problems of poor battery cell density, loose semicircular winding margins, and uneven density of arc-shaped winding sections, and is convenient for detecting the structural winding strength problems inside the wound battery cell. Second, through the second manual detection, the thickness of the batch of battery cells with qualified winding structures is detected 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 the coils, large material stretching, winding gaps, and unqualified winding methods. Compared with the main scale, the battery cell is qualified when its thickness is in the qualified thickness range. Third, for the battery cells with a high yield rate, Temperature testing of the battery cell can eliminate the phenomenon of uneven temperature resistance and temperature conduction caused by bulges, burrs, faults and other problems between the internal winding layers, and the consequence of the phenomenon causing the battery cell's ignition point to become lower and the 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 the height difference between the battery cell and the second test, and thus eliminated. 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 cell can be eliminated at one time, which can greatly improve the detection effect of good products of wound battery cells, which has great progressive significance.

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

[0022] Figure 1 It is a schematic diagram of the distribution of the components of the overall structure of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of each functional component of the present invention;

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

[0025] Figure 4 It is a schematic diagram of the track structure distribution of the present invention;

[0026] Figure 5 It 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 It is a schematic diagram of the corresponding structures of the core test group, the inspection group and the driving platform of the present invention;

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

[0029] Figure 8 It is a three-dimensional diagram of the standard thickness measuring group structure (briefly shown in the connecting plate) of the present invention.

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

[0031] 101, comparison frame; 102, offset 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 pile; 111, side guide rail 1; 112, one-way guide pile; 113, side guide rail 2;

[0032] 201, standard thickness measurement group; 202, comparison thickness measurement group; 203, comparison top plate; 204, movable guide column; 205, connecting plate; 206, fixed column; 207, main scale; 208, manual adjustment rotating column; 209, lateral comparison plate 1;

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

[0034] 214. Lifting ruler slot; 215. Lateral comparison board 2; 216. Infrared detection end;

[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] To facilitate 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 connected by technicians in the technical field to which the present invention belongs. 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 in this article includes any and all combinations of one or more related listed items.

[0040] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0041] The specific implementation method of measuring the thickness of the battery cell according to the present invention 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, 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 attraction 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 one 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 one side, and the second lateral comparison plate 215 is provided with an infrared detection end 216 on one side.

[0045] When measuring the thickness of battery cells, the 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 conveyor, and the single drive gear drives the chain to rotate. The 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 carrier tray 406 to the receiving plate of the lower-level carrier tray is a single moving distance, and the spacing between the two carrier trays 406 can be controlled by the positioning spacing of the blank imaging mechanism 104, the electromagnetic suction group 106, and the comparison imaging mechanism 105. Conversely, the identification spacing between the blank imaging mechanism 104, the electromagnetic suction group 106, and the comparison imaging mechanism 105 can also be changed according to the carrier tray 406. During the transportation process, the non-aligned part of the edge of the battery cell contacts and returns to its original position with the bias group 102. The wound battery cell that does not completely enter the range of the carrier tray 406 will have a contact force transmission due to the unidirectional rotation of the two sides of the bias group 102, so that the battery cell is aligned in the carrier 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, and conveys it to the electromagnetic suction group 106 to press the battery cell, and then takes an image for the second time through the comparison imaging mechanism 105, and the comparison processor 107 compares the two images with respect to the scale difference on the comparison driving table 4, and sets the recognition gap of the blank imaging mechanism 104, the comparison imaging mechanism 105, and the electromagnetic suction group 106 to be the conveying distance of the side driving motor 404 rotating three times, and the size of the three conveying distances can be set according to the spacing of the carrying tray 406 and the rotation circle diameter of the side driving motor 404, and the conveying frequency is changed according to the thickness measurement evaluation rate of the standard thickness measurement group 201;

[0047] S3, power-on inspection of defective products: The cells with a large difference in the width of the two imaging sides are randomly inspected and placed in the test port 301 to detect whether they are damaged. The large difference in the width of the two pairs of sides proves that they have been over-extruded in the S2 process. They have multiple undesirable factors such as dense winding, large winding gap, and insufficient bending surface strength. They are powered on to test whether there are any undesirable conditions in the 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 not enough to meet the pressure resistance requirements of ordinary cells, and their electrical properties are not stable, so they cannot be loaded and packaged for use;

[0048] S4, core thickness comparison: manually measure the thickness of the battery cells with qualified comparison imaging spacing in step S2 when the pressure sensor 401 sets the qualified pressure, and then transfer them to the middle rolling groove 403 chain of the next level for transportation, and perform a calibration test on the new level of products to test their qualified thickness under the condition of close pressure. If they are within the qualified interval, they are good products. If they are not within the interval, they are unqualified products with stable structure and stable electrical properties, but insufficient winding tightness of winding turns and excessive extension of 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 lateral comparison plate 1 209 with the lateral 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. It is a defective product. Performing temperature testing on the battery cell with a high yield rate can rule out the problem of heat resistance and heat conduction 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. After the test in a reasonable temperature range, unqualified heat-resistant products with bulging, expansion, etc. can be detected in the third bonding height measurement and the height difference between the battery cell and the second test, and thus 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 6 The driving ends of the load-bearing chain 405 and the auxiliary guide chain 408 are both provided with side drive motors 404. The driving end of the drive motor is 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 a plurality of load-bearing trays 406. The wound battery cells are on the load-bearing trays 406. The side of the load-bearing chain 405 is provided with side guide blocks 407. The middle rolling groove 403 is provided with guide grooves 413 on both sides. 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, and the adjustment grooves 409 are used to facilitate adjustment of the spacing between the guide rails 1 111 and the side guide rails 113 on both sides, so as to reduce the offset problem between the wound battery cell and the carrying tray 406, and the side guide rails 1 111 and the side guide rails 113 are slidably connected above the adjustment grooves 409, the side guide rails 1 111 are 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 rails 1 111 and the side guide rails 113 are parallel to the middle rolling groove 403, and the side where the two side guide rails 1 111 are close to each other is provided with an offset group 102, and the two offset groups 102 include a plurality of unidirectional guide piles 112, and the two groups of unidirectional guide piles 112 rotate in opposite directions;

[0053] 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, and the locking piles are used to offset the lateral squeezing force between the bias group 102 and the battery cell so that the side guide rail 1 111 and the side guide rail 2 113 move unbalancedly.

[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 an offset group 102 is provided on the side where the two side guide rails 111 are close to each other, and the two offset groups 102 include a plurality of one-way guide piles 112, and the two groups of one-way guide piles 112 rotate in opposite directions;

[0055] 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;

[0056] The side guide rail 2 113 is provided with a slot near the comparison thickness measurement group 202, and two lifting ruler slots 214 are provided on both sides of the slot. Matching blocks are provided on both sides of the side comparison plate 1 209 to match the lifting tooth slots. One end of the side comparison plate 215 is located inside the slot for sliding and is provided with a matching block to match another lifting tooth slot. The infrared detection end 216 is provided on one side of the side comparison plate 215 close to the side comparison plate 1 209.

[0057] Another implementation manner 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 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 fixed frame 213, an electromagnet 211 is arranged under the fixed frame 213, a metal positioning block is provided on the driving platform 4 to correspond to the electromagnet 211, and the end of the electromagnet 211 close to the fixed frame 213 is returned by a spring.

[0058] In another embodiment of the present invention: Please refer to Figure 1 , Figure 4-Figure 8The 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, and a blank imaging mechanism 104 and a control imaging mechanism 105 are respectively provided on the control frames 101, and 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 scale actual image.

[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 sloped guide platform 411 is provided on one side of the sinking platform 410. A detection groove 412 is provided inside the sloped 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 sink 410, a reference top plate 203 is provided on the top of the fixed column 206, a plurality of movable guide columns 204 are provided downwardly at the bottom of the reference top plate 203, a main scale 207 and a hand-adjustable rotary 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 hand-adjustable rotary column 208 is spirally connected to the reference top plate 203, 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 cells with qualified winding structure is inspected to ensure that the thickness of the qualified cells in this batch does not have the problem of insufficient overall thickness caused by insufficient winding of the coil layer, large material stretching, winding gaps, and unqualified winding methods. Compared with the main scale 207, the qualified cell is qualified when its thickness is in the qualified thickness range.

[0062] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] The above contents are merely examples and explanations of the structure of the present invention. The 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 invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

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), wherein a core control group (1) is provided on the intermediate rolling groove (403) on one side, and an inspection group (3) and a magnetic attraction comparison group (210) are provided on the intermediate rolling groove (403) on the other side, wherein 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) comprises 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 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 reference thickness measurement group (202) for synchronous movement; A second lateral comparison plate (215) is provided on one side of the magnetic comparison group (210) close to the comparison thickness measurement group (202), a first lateral comparison plate (209) is provided on one side of the comparison thickness measurement group (202), and an infrared detection end (216) is provided on one side of the second lateral comparison plate (215).

2. A 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 arranged inside the middle rolling groove (403); the upper ends of the load-bearing chain (405) and the auxiliary guide chain (408) at the conveying level are both connected to the top 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 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 middle rolling groove (403); and the side guide blocks (407) move 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); 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); 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); an offset group (102) is provided on the side where the two side guide rails 1 (111) are close to each other; the two offset groups (102) include a plurality of one-way guide piles (112); and the two groups of one-way guide piles (112) rotate in opposite directions; 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 ruler slots (214) are provided on both sides of the slot. Matching blocks are provided on both sides of the side comparison plate 1 (209) to match the lifting tooth slots. One end of the side comparison plate 2 (215) is located inside the slot for sliding and is provided with a matching block to match the other lifting tooth slot. The infrared detection end (216) is arranged on the side of the side comparison plate 2 (215) close to the side comparison plate 1 (209).

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 arranged 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 respectively arranged on the control frames (101), and an electromagnetic attraction group (106) is arranged below the control processor (107); The control frame (101) comprises a transverse 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 at the temporal part of the movable groove (109) and slide on both sides.

7. The thickness measuring device for a wound battery cell according to claim 1, characterized in that: The inspection group (3) comprises a power-on test mechanism (302) and a test port (301); a slanted guide platform (411) is provided on one side of the sink 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.

8. The thickness measuring device for a wound battery cell according to claim 1, characterized in that: The standard thickness measuring group (201) includes a plurality of fixed columns (206) installed above the sink (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. A thickness measuring device for a wound battery cell according to claim 4, characterized in that: The inspection group (3) also includes a constant temperature chamber (303), the constant temperature chamber (303) is arranged on the second side guide rail (113), the magnetic attraction comparison group (210) is arranged on the material exit side of the constant temperature chamber (303), the magnetic attraction comparison group (210) includes a fixing frame (213), an electromagnet (211) is arranged below the fixing frame (213), a metal positioning block is arranged on the driving platform (4) and is correspondingly attracted to the electromagnet (211), and one end of the electromagnet (211) close to the fixing frame (213) is returned by a spring.

10. A method for measuring the thickness of a wound battery cell, according to a device for measuring the thickness of a wound battery cell according to claims 1-9, characterized in that: The following steps are involved: S1, random inspection of battery cells: the randomly inspected battery cells are placed in batches in the middle rolling groove (403) for chain conveying, and the side drive motor (404) is used for single equal distance conveying, and the non-aligned parts of the battery cell edges are contacted with the offset group (102) for sorting and returning to their original positions; S2, deformation verification: the blank imaging mechanism (104) takes an image of the battery cell passing below, and transports it to the electromagnetic attraction group (106) to press the battery cell, and then takes an image for the second time through the comparison imaging mechanism (105). The comparison processor (107) compares the two images with respect to the scale difference on the comparison driving platform (4), and sets the recognition gap of the blank imaging mechanism (104), the comparison imaging mechanism (105), and the electromagnetic attraction group (106) to be the transportation distance of three rotations of the side driving motor (404); S3, power-on inspection of defective products: randomly check the cells with the largest difference in width between the two imaging sides and put them into the test port (301) to check whether they are damaged; S4, core thickness comparison: manually measuring the thickness of the battery cells with qualified comparison imaging spacing in step S2 when the pressure set by the pressure sensor (401) is qualified, and then transferring them to the next level of the intermediate rolling groove (403) chain for transportation; S5. Temperature resistance thickness comparison: Use the constant temperature chamber (303) in the inspection group (3) to set an independent temperature zone, use the magnetic attraction comparison group (210) to measure the thickness of the battery cell, compare the thickness of the lateral comparison plate 1 (209) with the lateral comparison plate 2 (215) in step S4, and eliminate defective products.

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