Electrolytic copper foil end face anti-oxidation device for lithium battery and use method of electrolytic copper foil end face anti-oxidation device

Abstract

According to the lithium battery electrolytic copper foil end face anti-oxidation device and the using method thereof, the device comprises two anti-oxidation assemblies symmetrically arranged on the end face of the copper foil, and each anti-oxidation assembly comprises a fixed ring, an inner ring, an outer ring, a sliding arm, a telescopic arm and a self-adjusting mechanism. In a static state, the gear ring can rotate in the outer ring by lifting the transverse plate, and the sliding arm synchronously slides along a straight line in the rotating process, so that the arc-shaped clamping plate not only can be in contact with the copper foil at any time, but also can support the pearl wool or the PE film, the process of replacing the gear ring is replaced, and the device can adapt to different direct copper foil rolls; secondly, under the condition of dynamic operation, the whole body is externally wrapped with pearl wool or a PE film, in the process of pulling out the copper foil, under the return action of a spring, the telescopic arm and the sliding arm are synchronously retracted, self-adaptive adjustment can be achieved, and operation is simple and rapid; and finally, oxygen and moisture can be adsorbed through a built-in oxidant, so that the problem of oxidation of the end face of the copper foil is avoided, and the quality of raw materials is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrolytic copper foil production, in particular to an electrolytic copper foil end face anti-oxidation device for lithium batteries and a use method thereof. BACKGROUND

[0002] Under the background of rapid iteration of electronic products and vigorous development of new energy automobile industry, the demand for lithium batteries is increasing, and the application field of electrolytic copper foil as the core material of lithium battery negative electrode current collector is continuously expanding. The manufacturing process of electrolytic copper foil for lithium batteries mainly includes: copper solution preparation, electrolytic preparation of green foil, surface treatment and slitting. First, the green foil prepared by electrolysis is subjected to surface treatment, which will deposit a layer of anti-oxidation film on the surface of the copper foil to prevent the copper foil from contacting oxygen. Then the copper foil is wound on the core, and in the slitting process, the copper foil after surface treatment is cut into electrolytic copper foil products of different widths according to different customer requirements. At this time, since the anti-oxidation film on the end face is cut off, the newly formed end face of the electrolytic copper foil is easy to oxidize and discolor without the protection of the anti-oxidation layer, which may cause problems such as poor welding and abnormal end face conductivity in downstream applications.

[0003] In the prior art, in order to prevent the end face of the electrolytic copper foil product after slitting from oxidizing, the copper foil factory generally uses a stop ring to protect the two end faces of the copper foil after cutting, and then wraps the entire copper foil and end face with shock-absorbing pearl wool or PE film to achieve anti-oxidation of the end face of the electrolytic copper foil after slitting. The stop ring mainly serves as a support and protection, which can achieve anti-oxidation of the end face of the electrolytic copper foil to some extent. However, after wrapping with pearl wool or PE film, there will still be some oxygen between the two end faces and the stop ring, which will cause oxidation of the two end faces. Secondly, during use, the diameter of the entire copper foil will continuously decrease, which will cause the diameter of the stop ring to be larger than the diameter of the copper foil roll. Due to the difference in diameter, the amount of internal oxygen will increase during wrapping, which will exacerbate oxidation. If different diameter stop rings are replaced continuously, not only is the operation tedious and time-consuming, but also the operation efficiency is low, and the risk of oxidation of the outer end face of the electrolytic copper foil cannot be avoided. SUMMARY

[0004] In order to solve the above technical defects, the present application provides an electrolytic copper foil end face anti-oxidation device for lithium batteries and a use method thereof, which mainly solves the problem of oxidation of the two cut end faces of the copper foil roll.

[0005] The present application adopts the following technical solutions:

[0006] The utility model provides an anti-oxidation device for the end face of electrolytic copper foil of lithium battery, which comprises two anti-oxidation components symmetrically arranged on the end face of the copper foil, each anti-oxidation component comprises a fixing ring, the fixing ring is sleeved on the roll core, a plurality of support rods are distributed at intervals on the outer surface of the fixing ring, the distal end of each support rod is fixedly connected with the inner wall of an inner ring, a first storage plate is detachably arranged between adjacent support rods, an outer ring is further sleeved on the outer part of the inner ring, a plurality of one-to-one corresponding limiting sliding grooves are further formed on the outer ring and the inner ring respectively, a sliding arm is movably arranged in the limiting sliding groove, a first toothed plate is fixedly arranged on the sliding arm, an arc-shaped clamping plate is further fixedly arranged at the distal end of each sliding arm, a plurality of second storage plates are further fixedly arranged between the inner ring and the outer ring, a gear ring is movably mounted on the inner part of the outer ring, a plurality of first transmission gears are further arranged on the outer ring, each first transmission gear is engaged with the gear ring and the first toothed plate respectively, a second transmission gear is movably mounted on each of the two symmetrical second storage plates, each second transmission gear is engaged with the gear ring and a second toothed plate respectively, the second toothed plate is fixedly mounted on a self-adjusting mechanism, and the number of the self-adjusting mechanisms is not less than two.

[0007] Preferably, the radial length of the outer ring and the inner ring is equal to the radial length of the fixing ring.

[0008] Preferably, a circular groove is further formed on the side of the outer ring close to the end face of the copper foil roll, a perforated retainer ring is detachably arranged in the circular groove, and the retainer ring is sleeved on the fixing ring.

[0009] Preferably, a plurality of threaded holes are further arranged at intervals on the fixing ring, an adjusting screw is arranged in each threaded hole, and the bottom of each adjusting screw is movably connected with an arc-shaped fastening plate.

[0010] Preferably, the arc-shaped fastening plate is made of one or more of rubber, thermoplastic polyurethane or silica gel.

[0011] Preferably, a plurality of air holes are formed on each first storage plate and second storage plate, the diameter of the air holes is smaller than the diameter of the oxidant particles, a first storage cavity and a second storage cavity are respectively formed on the side of the first storage plate and the second storage plate close to the end face of the copper foil roll, an oxidant is placed in the first storage cavity and the second storage cavity, the oxidant is one or more of silica gel desiccant or montmorillonite desiccant, and is in a granular or powdery form.

[0012] Preferably, an arc-shaped groove is further formed on the side of each arc-shaped clamping plate close to the end face of the copper foil roll, and a flexible pad strip is arranged in the arc-shaped groove.

[0013] Preferably, the self-adjusting mechanism comprises a fixed seat, a telescopic arm movably arranged inside the fixed seat, one side of the telescopic arm being fixedly connected with the second toothed plate, the bottom of the telescopic arm being further connected with a spring, the other end of the spring being fixedly connected with a bottom plate, the bottom plate being fixed on an inner ring, the top of the telescopic arm being further fixedly connected with a cross plate, the distal end bottom of the cross plate being further movably arranged with a roller.

[0014] Preferably, the application further provides a use method of the electrolytic copper foil end surface anti-oxidation device for lithium batteries, comprising the following steps:

[0015] Step 1: filling the oxidizing agent, when the oxidizing agent is in granular form, first place the oxidizing agent in the first receiving cavity and the second receiving cavity, when the oxidizing agent is in powder form, it needs to be wrapped with gauze or cheesecloth, then use a screw to fix the check ring in the circular groove on one side of the outer ring, and ensure that the middle of the check ring is sleeved on the fixed ring;

[0016] Step 2: positioning the fixed ring, sleeving the two fixed rings on the two end cores respectively, when moving to 5-10mm away from the two ends of the copper foil roll, stop moving the fixed ring, then twist the adjusting screw, the arc-shaped fastening plate is gradually in contact with the core in the process of rotating the adjusting screw, so that the fixed ring is locked on the core;

[0017] Step 3: adjusting the position, after the fixed ring is locked, according to the diameter of the copper foil roll, manually synchronously lifting the two symmetrical cross plates, so that the roller is in contact with the outermost layer of the copper foil roll, in this process, the spring is stretched, and in the process of lifting, the second toothed plate drives the second transmission gear to rotate, the second transmission gear synchronously drives the gear ring to rotate inside the outer ring, in the process of rotating the gear ring, the first transmission gear is also driven to rotate, the first transmission gear drives the first toothed plate to move, and the first toothed plate drives the sliding arm to move, so that the arc-shaped clamping plate is in contact with the outermost layer of the copper foil roll automatically according to the change of the diameter of the copper foil roll;

[0018] Step 4: wrapping and adsorbing, wrapping the whole anti-oxidation assembly at the two ends of the copper foil roll with pearl wool or PE film, the built-in oxidizing agent can adsorb the internal oxygen and moisture, thereby avoiding the oxidation of the two end surfaces of the copper foil.

[0019] The application has the following beneficial effects:

[0020] The application can adapt to static and dynamic operation conditions, in the static state, the tooth ring can rotate in the outer ring by lifting the horizontal plate, and the sliding arm can slide along the straight line synchronously in the rotating process, so that the arc-shaped clamping plate can contact the copper foil at any time and support the pearl wool or PE film, replacing the process of replacing the blocking ring at any time, and can be assembled to the copper foil roll of different diameters for subsequent oxidation prevention treatment; in the dynamic state, the whole is wrapped with pearl wool or PE film, and can be self-adapted to adjust with the change of the diameter of the copper foil roll in the process of pulling out the copper foil, that is, with the diameter becoming smaller, the telescopic arm and the sliding arm are synchronously retracted under the reset action of the spring, which is simple and fast; secondly, the built-in oxidant can adsorb oxygen and moisture, avoiding the oxidation problem of the end surface of the copper foil, through the scheme, the cutting end surface protection of the copper foil roll of different diameters can be applied in the transportation process or operation process, and the quality of the raw material is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a three-dimensional structure schematic diagram of the device of the application;

[0022] Figure 2 It is a side view structure schematic diagram of the device of the application;

[0023] Figure 3 It is a front view installation structure schematic diagram of the anti-oxidation assembly;

[0024] Figure 4 It is another side structure installation schematic diagram of the anti-oxidation assembly;

[0025] Figure 5 It is a three-dimensional structure schematic diagram of the anti-oxidation assembly without blocking ring;

[0026] Figure 6 It is a front view structure schematic diagram of the device of the application;

[0027] In the drawing: fixed ring 1, roll core 2, support rod 3, inner ring 4, first receiving plate 5, outer ring 6, limiting sliding groove 7, sliding arm 8, first tooth plate 9, arc-shaped clamping plate 10, second receiving plate 11, tooth ring 12, first transmission gear 13, second transmission gear 14, second tooth plate 15, self-adjusting mechanism 16, circular groove 17, blocking ring 18, adjusting screw 19, arc-shaped fastening plate 20, air vent 21, first receiving cavity 22, second receiving cavity 23, arc-shaped groove 24, flexible gasket 25, fixed seat 160, telescopic arm 161, spring 162, bottom plate 163, horizontal plate 164 and roller 165. DETAILED DESCRIPTION

[0028] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0029] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0030] Embodiment one:

[0031] Reference Figures 1-6The utility model provides an electrolytic copper foil end face anti -oxidation device for lithium battery, including two symmetry setting in copper foil end face anti -oxidation subassembly, this anti -oxidation subassembly two two symmetry uses, sets up in the copper foil roll after cutting both ends, and every anti -oxidation subassembly includes fixed ring 1, and fixed ring 1 mainly supports and positioning effect, the fixed ring 1 is sleeved on the roll core 2, and the outer surface of fixed ring 1 is spaced apart and is distributed with multiple support bars 3, and the distal end of every support bar 3 is fixedly connected with the inner wall of inner ring 4, and the first storage plate 5 is detachably arranged between adjacent support bars 3, and fixed ring 1 and inner ring 4 are connected through multiple support bars 3, so that adjacent support bars 3 will form a sector space, and the first storage plate 5 is detachably arranged in the sector space, and the first storage plate 5 is used to place oxidant, and the number of first storage plate 5 can be set as required, mainly depends on the number of support bars 3, and setting how many support bars 3 can also place how many first storage plate 5, and the outer part of inner ring 4 is also sleeved with outer ring 6, and a plurality of one-to-one limiting sliding grooves 7 are formed in outer ring 6 and inner ring 4 respectively, and the limiting sliding groove 7 is movably equipped with sliding arm 8, and sliding arm 8 moves in the process, and will move along the limiting sliding groove 7 on outer ring 6 and inner ring 4, and the limiting sliding groove 7 on inner ring 4 and outer ring 6 is located on the same horizontal line, and sliding arm 8 can not be separated from the movement of first toothed plate 9 through the limiting sliding groove 7, and has the guiding effect, and first toothed plate 9 is fixedly arranged on sliding arm 8, and first toothed plate 9 is equivalent to being installed at the bottom of sliding arm 8, and arc-shaped clamping plate 10 is fixedly arranged at the distal end of every sliding arm 8, and arc-shaped clamping plate 10 can continuously change the distance from the outermost layer of copper foil roll along with the movement of sliding arm 8, and a plurality of second storage plates 11 are fixedly arranged between inner ring 4 and outer ring 6, and second storage plate 11 and first storage plate 5 are used to place oxidant, and gear ring 12 is movably installed in the inner part of outer ring 6, and gear ring 12 can rotate in the inner part of outer ring 6, and the toothed portion of gear ring 12 is stretched out, and a plurality of first transmission gears 13 are equipped on outer ring 6, and every first transmission gear 13 is installed on outer ring 6 through mounting plate, and every first transmission gear 13 is arranged along the radial direction, and every first transmission gear 13 is engaged with gear ring 12 and first toothed plate 9 respectively, and gear ring 12 rotates in the process, and will synchronously drive a plurality of first transmission gears 13 engaged with it to rotate, and every first transmission gear 13 is engaged with first toothed plate 9, so that the rotary motion of every first transmission gear 13 can be converted into the linear motion of first toothed plate 9, and first gear 9 is fixedly installed on sliding arm 8, so sliding arm 8 will move linearly along the limiting sliding groove 7.Two symmetrical second receiving plates 11 are also movably installed with second transmission gears 14, which are equivalent to one second transmission gear 14 movably installed on each symmetrical second receiving plate 11. The second transmission gears 14 are also arranged in the radial direction. Each second transmission gear 14 is engaged with the gear ring 12 and the second tooth plate 15. Whether the gear ring 12 can rotate depends on the movement of the second tooth plate 15. When the second tooth plate 15 is displaced with the self-adjusting mechanism 16, the second tooth plate 15 will rotate the second transmission gear 14. The rotation of the second transmission gear 14 will make the gear ring 12 engaged therewith also rotate. The second tooth plate 15 is fixedly installed on the self-adjusting mechanism 16. The number of the self-adjusting mechanism 16 is not less than two and is generally an integer multiple. The movement of the self-adjusting mechanism 16 can synchronously displace the sliding arm 8 to drive the arc-shaped clamping plate 10 to displace, which can adapt to copper foil rolls of different diameters. Then, the copper foil roll is wrapped with the anti-oxidation assembly at both ends by pearl wool or PE film. The built-in oxidant can adsorb the internal oxygen and moisture, thereby avoiding the oxidation of the copper foil at both ends.

[0032] The radial length of the outer ring 6 and the inner ring 4 along the radial length of the roll core 2 is equal, so that the limiting sliding groove 7 on the two can maintain a constant thickness, which is beneficial to the linear motion of the sliding arm 8, and is greater than the radial length of the fixed ring 1, so that the sliding arm 8 is not limited by the fixed ring 1 during the linear motion of the sliding arm 8, that is, the end of the sliding arm 8 will not contact the fixed ring 1.

[0033] Referring to Figure 4 , the outer ring 6 is also provided with a circular groove 17 on the side close to the end face of the copper foil roll. A perforated retainer ring 18 is detachably arranged in the circular groove 17. A plurality of positioning holes can be arranged in the circular groove 17 in the circumferential direction. The retainer ring 18 can be detachably installed in the circular groove 17 by a screw rod or the like. In this way, the oxidant can be blocked, and after wrapping, the internal moisture and oxygen can pass through the circular holes in the retainer ring 18, which is convenient for adsorbing the internal oxygen and moisture. The retainer ring 18 is also sleeved on the fixed ring 1, so that the retainer ring 18 can be installed on the roll core.

[0034] Referring to Figure 3 , a plurality of threaded holes are also arranged on the fixed ring 1 at intervals. An adjusting screw 19 is arranged in each threaded hole. The bottom of each adjusting screw 19 is movably connected with an arc-shaped fastening plate 20. When the fixed ring 1 moves to a specified position, the adjusting screw 19 is manually twisted. The bottom of the adjusting screw 19 will push the arc-shaped fastening plate 20 to approach the roll core 2. The upper part of the arc-shaped fastening plate 20 is movably connected with the bottom of the adjusting screw 19, so that the arc-shaped fastening plate 20 will not rotate during rotation, but will only move up and down.

[0035] The material of the arc-shaped fastening plate 20 is one or more of rubber, thermoplastic polyurethane or silica gel, so that the arc-shaped fastening plate 20 can play the role of fastening without causing abrasion and damage to the core 2.

[0036] Referring to Figure 5 A plurality of air holes 21 are formed on each of the first receiving plate 5 and the second receiving plate 11, the air holes 21 have a diameter smaller than that of the oxidant particles, the air holes 21 can ensure that the oxygen and moisture in the side away from the end face of the copper foil can pass through the first receiving plate 5 and the second receiving plate 11, and the first receiving plate 5 and the second receiving plate 11 are respectively provided with a first receiving cavity 22 and a second receiving cavity 23 on the side close to the end face of the copper foil roll, the first receiving cavity 22 and the second receiving cavity 23 are used to place the oxidant, the oxidant is one or more of silica gel desiccant or montmorillonite desiccant, and is in a granular or powder form, when the oxidant is in a granular form, the diameter of the circular hole of the installed check ring 18 and the air hole 21 should be smaller than that of the particles, so that the oxidant particles cannot leak out, if the oxidant is in a powder form, the oxidant needs to be wrapped with gauze and then placed in the first receiving cavity 22 and the second receiving cavity 23.

[0037] Referring to Figure 4 The arc-shaped slot 24 is formed on the side close to the end face of the copper foil roll of each arc-shaped clamping plate 10, and the flexible pad strip 25 is arranged in the arc-shaped slot 24, the arc-shaped slot 24 is used to make the arc-shaped clamping plate 10 better contact with the outermost layer of the copper foil roll, and the flexible pad strip 25 arranged inside can ensure that the copper foil roll is not damaged after contact, and plays the role of buffering and protection.

[0038] Referring to Figures 1-2The self-adjusting mechanism 16 comprises a fixed seat 160, a telescopic arm 161 movably arranged inside the fixed seat 160, the telescopic arm 161 and the second toothed plate 15 both penetrating through the through hole formed on the movable seat 160, one side of the telescopic arm 161 being fixedly connected with the second toothed plate 15, the second toothed plate 15 moving synchronously with the telescopic arm 160, the bottom of the telescopic arm 161 being further connected with a spring 162, the other end of the spring 162 being fixedly connected with a bottom plate 163, the bottom plate 163 being fixed on the inner ring 4, the top of the telescopic arm 161 being further fixedly connected with a cross plate 164, the distal end bottom of the cross plate 164 being further movably arranged with a roller 165, after cutting the end face of the copper foil roll, the device is first installed, then the cross plate 164 is manually pulled to make the bottom of the roller 165 contact with the outermost copper foil roll, in the process, the telescopic arm 161 drives the second toothed plate 15 to move, in the moving process, the spring 162 is in a stretched state, and the second toothed plate 15 drives the second transmission gear 14 to rotate, which makes the gear ring 12 rotate, in the rotating process, the first transmission gear 13 rotates, and the first transmission gear 13 drives the first toothed plate 9 and the sliding arm 8 to move, so that the arc-shaped clamping plate 10 is extended outwardly and contacts with the outer copper foil in the process of pulling the cross plate 164, when the copper foil roll is used, the operator will pull the copper foil roll to rotate, so that the diameter of the copper foil roll becomes smaller, at this time, the telescopic arm 161 is pulled back under the action of the spring 162, in the pulling-back process, the gear ring 12 is turned over, so that the sliding arm 8 is also retracted, in the process, the roller 165 and the arc-shaped clamping plate 10 both contact with the outermost copper foil roll, and separate adjustment is not needed, through the technical scheme, the structure can adapt to copper foil rolls with different diameters.

[0039] Embodiment 2:

[0040] The difference from embodiment 1 is that the scheme of the application is also applicable to dynamic operation, that is, the case of stretching the copper foil roll, in the process, the device is first set in a static state, then the whole is wrapped with pearl wool or PE film, in the process, it is only needed to ensure that the contact surface of the pulled-out copper foil roll and the wrapped pearl wool or PE film does not enter oxygen, different sealing layers can be set, so that the pulled-out copper foil passes through the sealing layer, and as the diameter of the copper foil roll becomes smaller, the application can be automatically adjusted under the action of the spring 162 returning to the original position, in the process, it can always adapt to different diameter changes, can always ensure that the roller 165 and the arc-shaped clamping plate 10 contact with the outermost copper foil, and the arc-shaped clamping plate 10 and the cross plate 164 also play a role of supporting the wrapped pearl wool or PE film in the process, so that the oxidation problem of the cut end face can also be ensured in the operation process.

[0041] The application also provides a use method of the electrolytic copper foil end surface anti-oxidation device for lithium batteries, comprising the following steps:

[0042] Step 1: filling the oxidant, when the oxidant is in granular form, first place the oxidant in the first receiving cavity 22 and the second receiving cavity 23, and when the oxidant is in powder form, wrap it with gauze or cloth, then fix the check ring 18 in the circular groove 17 on one side of the outer ring 6 using a screw, and ensure that the middle of the check ring 18 is sleeved on the fixing ring 1, the main purpose of this process is to ensure that the oxidant does not leak;

[0043] Step 2: positioning the fixing ring 1, sleeve the two fixing rings 1 on the two end cores 2 respectively, stop moving the fixing ring 1 when it moves to 5-10 mm away from the two ends of the copper foil roll, then twist the adjusting screw 19, which makes the arc-shaped fastening plate 20 gradually contact with the core 2 in the process of rotation, so that the fixing ring 1 is locked on the core 2, this process can adapt to different diameters of the core 2 and can position and adjust the fixing ring 1;

[0044] Step 3: adjusting the position, after the fixing ring 1 is locked, according to the diameter of the copper foil roll, manually and synchronously pull the two symmetrical horizontal plates 164, so that the rollers 165 contact with the outermost layer of the copper foil roll, in this process, the spring 162 will be stretched, and the process of pulling the second gear plate 15 will drive the second transmission gear 14 to rotate, the second transmission gear 14 synchronously drives the gear ring 12 to rotate inside the outer ring 6, in the process of rotating the gear ring 12, the first transmission gear 13 will also be driven to rotate, which will drive the first gear plate 9 to move, and the first gear plate 9 will drive the sliding arm 8 to move, so that the arc-shaped clamping plate 10 automatically contacts with the outermost layer of the copper foil roll as the diameter of the copper foil roll changes;

[0045] Step 4: wrapping and adsorbing, wrap the whole anti-oxidation assembly at the two ends of the copper foil roll with pearl wool or PE film, and the built-in oxidant can adsorb the internal oxygen and moisture, thereby avoiding the oxidation of the two end surfaces of the copper foil.

[0046] The above is only a preferred embodiment of the present application, and does not limit the present application in other forms, any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments applied to other fields, but any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiments still belongs to the protection scope of the technical solution of the present application.

Claims

1. A device for preventing oxidation of the end face of electrolytic copper foil for lithium batteries, characterized in that, The application relates to an anti-oxidation assembly for copper foil roll, which comprises two symmetrical anti-oxidation assemblies arranged on the end faces of the copper foil roll, each anti-oxidation assembly comprises a fixing ring (1) sleeved on a roll core (2), the outer surface of the fixing ring (1) is provided with a plurality of support rods (3) at intervals, the distal end of each support rod (3) is fixedly connected with the inner wall of an inner ring (4), first receiving plates (5) are detachably arranged between adjacent support rods (3), the outer portion of the inner ring (4) is further sleeved with an outer ring (6), a plurality of one-to-one corresponding limiting sliding grooves (7) are formed in the outer ring (6) and the inner ring (4) respectively, sliding arms (8) are movably arranged in the limiting sliding grooves (7), first toothed plates (9) are fixedly arranged on the sliding arms (8), arc-shaped clamping plates (10) are further fixedly arranged at the distal end of each sliding arm (8), a plurality of second receiving plates (11) are further fixedly arranged between the inner ring (4) and the outer ring (6), a gear ring (12) is movably arranged in the inner portion of the outer ring (6), a plurality of first transmission gears (13) are arranged on the outer ring (6), each first transmission gear (13) is engaged with the gear ring (12) and the first toothed plate (9) respectively; a plurality of second transmission gears (14) are movably arranged on the two symmetrical second receiving plates (11), each second transmission gear (14) is engaged with the gear ring (12) and a second toothed plate (15) respectively, the second toothed plate (15) is fixedly arranged on a self-adjusting mechanism (16), and the number of the self-adjusting mechanism (16) is not less than two.

2. The electrolytic copper foil end surface oxidation preventing device for lithium batteries according to claim 1, characterized by The radial length of the outer ring (6) and the inner ring (4) along the roll core (2) is equal and greater than the radial length of the fixing ring (1).

3. The electrolytic copper foil end surface oxidation preventing device for lithium batteries according to claim 2, characterized by A circular recess (17) is formed in the side of the outer ring (6) close to the end face of the copper foil roll, a porous retainer ring (18) is detachably arranged in the circular recess (17), and the retainer ring (18) is sleeved on the fixing ring (1).

4. The electrolytic copper foil end surface oxidation preventing device for lithium batteries according to claim 1, characterized by A plurality of threaded holes are arranged on the fixing ring (1) at intervals, an adjusting screw (19) is arranged in each threaded hole, and an arc-shaped fastening plate (20) is movably connected to the bottom of each adjusting screw (19).

5. The electrolytic copper foil end surface oxidation preventing device for lithium batteries according to claim 4, characterized by The arc-shaped fastening plate (20) is made of one or more of rubber, thermoplastic polyurethane or silica gel.

6. The electrolytic copper foil end surface oxidation preventing device for lithium batteries according to claim 1, characterized by A plurality of air holes (21) are formed in each first receiving plate (5) and second receiving plate (11), the diameter of the air holes (21) is smaller than the diameter of oxidant particles, and a first receiving cavity (22) and a second receiving cavity (23) are respectively formed in the side of the first receiving plate (5) and the second receiving plate (11) close to the end face of the copper foil roll, an oxidant is placed in the first receiving cavity (22) and the second receiving cavity (23), the oxidant is one or more of silica gel desiccant or montmorillonite desiccant, and is in a granular or powdery form.

7. The electrolytic copper foil end surface oxidation preventing device for lithium batteries according to claim 1, characterized by An arc-shaped groove (24) is formed in the side of each arc-shaped clamping plate (10) close to the end face of the copper foil roll, and a flexible pad strip (25) is arranged in the arc-shaped groove (24).

8. The electrolytic copper foil end surface oxidation preventing device for lithium batteries according to claim 1, characterized by The self-adjusting mechanism (16) comprises a fixed seat (160), a telescopic arm (161) movably arranged inside the fixed seat (160), one side of the telescopic arm (161) being fixedly connected with the second toothed plate (15), the bottom of the telescopic arm (161) being further connected with a spring (162), the other end of the spring (162) being fixedly connected with a bottom plate (163), the bottom plate (163) being fixed on the inner ring (4), the top of the telescopic arm (161) being further fixedly connected with a cross plate (164), the distal end bottom of the cross plate (164) being further movably arranged with a roller (165).

9. A method of using an electrolytic copper foil end surface oxidation prevention device for a lithium battery, characterized by, The method for using the end surface oxidation prevention device for electrolytic copper foil of lithium battery according to any one of claims 1-8 comprises the following steps: Step 1: filling the oxidant, when the oxidant is in granular form, first place the oxidant in the first receiving cavity (22) and the second receiving cavity (23), when the oxidant is in powder form, it needs to be wrapped with gauze or gauze, then use a screw to fix the check ring (18) in the circular groove (17) on one side of the outer ring (6), and ensure that the middle of the check ring (18) is sleeved on the fixed ring (1); Step 2: positioning the fixed ring (1), sleeving the two fixed rings (1) on the two end cores (2) respectively, stopping the movement of the fixed ring (1) when moving to 10 mm away from the two ends of the copper foil roll (5), then turning the adjusting screw (19), the arc-shaped fastening plate (20) is gradually in contact with the core (2) in the process of rotating the adjusting screw (19), so that the fixed ring (1) is locked on the core (2); Step 3: adjusting the position, after the fixed ring (1) is locked, according to the diameter of the copper foil roll, manually synchronously lifting the two symmetrical cross plates (164) to make the roller (165) in contact with the outermost layer of the copper foil roll, the spring (162) will be stretched in this process, and the second toothed plate (15) will drive the second transmission gear (14) to rotate in the process of lifting, the second transmission gear (14) synchronously drives the gear ring (12) to rotate inside the outer ring (6), in the process of rotating the gear ring (12), the first transmission gear (13) will also be driven to rotate, the first transmission gear (13) will drive the first toothed plate (9) engaged therewith to move, and the first toothed plate (9) will drive the sliding arm (8) to move, so that the arc-shaped clamping plate (10) can automatically contact the outermost layer of the copper foil roll with the change of the diameter of the copper foil roll; Step 4: wrapping and adsorbing, wrapping the entire oxidation prevention assembly at both ends of the copper foil roll with pearl wool or PE film, the built-in oxidant can adsorb the internal oxygen and moisture, thereby avoiding the oxidation of the end surfaces of the copper foil.

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