Preparation method and device of interval type copper-lithium composite belt

Abstract

The invention discloses a preparation method and device of an interval type copper-lithium composite belt, and relates to the technical field of batteries. Comprising the following steps: S1, preparing two rolls of lithium strips and a roll of copper foil strip; s2, the copper foil strip is arranged between the two lithium strips, and the copper foil strip and the two lithium strips are aligned; s3, winding and unwinding the copper foil strip and the lithium strip through an interval type copper-lithium composite strip preparation device; and S4, during winding and unwinding, the copper foil strip and the lithium strip are compounded at intervals through preparation of an interval type copper-lithium composite strip, and the lithium strip is compounded on the two sides of the copper foil strip. According to the invention, the lithium strip and the copper foil are compounded to form the copper-lithium composite strip by utilizing the pressure between the two compression rollers, and the copper foil and the lithium are compounded at intervals by controlling the horizontal directions of the compression rollers to form the interval type copper-lithium composite strip, so that the production efficiency of the copper-lithium composite strip is effectively improved, and more composite strip materials can be provided for battery design of customers.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a method and device for preparing a spaced copper-lithium composite strip. Background Art

[0002] With the consumption of fossil energy and the greenhouse effect caused by the consumption of fossil energy, as well as the development of portable electronic devices, the application of lithium-containing new energy power sources has become increasingly widespread, and people have increasingly higher requirements for the energy density of batteries.

[0003] Due to the loss of lithium during the use of lithium batteries, battery lithium replenishment technology came into being. While solving the problem of battery lithium loss, it can also improve the battery energy density, and then the lithium replenishment type copper foil current collector was developed.

[0004] In the existing technology, the composite tapes are all in the form of continuous composites. However, as lithium batteries develop towards large capacity and large volume, the continuous copper-lithium composite tapes are gradually unable to meet the size requirements of various current battery manufacturers, and due to the limitation of equipment size, the production capacity cannot match the actual demand.

[0005] Therefore, there is an urgent need for an efficient production method for spaced copper-lithium composite strips. Summary of the invention

[0006] The main purpose of the present invention is to provide a method and device for preparing a spaced copper-lithium composite strip to solve the above problems.

[0007] To achieve the above object, the present invention provides a method for preparing a spaced copper-lithium composite tape, comprising the following steps:

[0008] S1. Prepare two rolls of lithium tape and one roll of copper foil tape;

[0009] S2, placing the copper foil strip between the two lithium strips and aligning the three strips;

[0010] S3, taking up and releasing the copper foil strip and the lithium strip by means of a spaced copper-lithium composite strip preparation device;

[0011] S4. During the retraction and release, the copper foil strip and the lithium strip are intermittently composited by preparing the intermittent copper-lithium composite strip, and the lithium strip is composited on both sides of the copper foil strip.

[0012] Furthermore, in step S4, during the recombination, the composite copper-lithium composite belt is tested, and the frequency of the intermittent recombination and the duration of a single recombination are adjusted according to the actual length of the lithium supplementation zone.

[0013] Furthermore, in step S1, when single-sided lithium coating is required, one of the lithium ribbon rolls is replaced with a polypropylene film.

[0014] The present invention also provides a spaced copper-lithium composite tape preparation device, which is used in the above-mentioned preparation method, comprising:

[0015] Equipment panel;

[0016] A pressing roller group, the pressing roller group is arranged on the equipment panel, the pressing roller group comprises a first pressing roller and a second pressing roller arranged horizontally, the first pressing roller and the second pressing roller can move towards or away from each other;

[0017] An unwinding group, the unwinding group is arranged above the pressure roller group, and includes a first unwinding roller, a second unwinding roller and a third unwinding roller which are arranged in sequence horizontally;

[0018] A winding group, the winding group is arranged below the pressure roller group, and includes a first winding roller, a second winding roller and a third winding roller which are arranged in sequence horizontally;

[0019] A first lithium ribbon is arranged on the first unwinding roller, and the other end of the first lithium ribbon passes through between the first pressing roller and the second pressing roller and is connected to the first winding roller;

[0020] The second unwinding roller is provided with a copper foil tape, and the other end of the copper foil tape passes through between the first pressing roller and the second pressing roller and is connected to the second winding roller;

[0021] The third unwinding roller is provided with a second lithium ribbon, and the other end of the second lithium ribbon passes through between the first pressing roller and the second pressing roller and is connected to the third winding roller.

[0022] Furthermore, a first passing roller is arranged between the pressure roller group and the first unwinding roller, a second passing roller is arranged between the pressure roller group and the first winding roller, a third passing roller is arranged between the pressure roller group and the third unwinding roller, and a fourth passing roller is arranged between the pressure roller group and the third winding roller.

[0023] Furthermore, tension rollers are provided between the first passing roller and the pressure roller group, between the second passing roller and the pressure roller group, between the third passing roller and the pressure roller group, between the fourth passing roller and the pressure roller group, between the second unwinding roller and the pressure roller group, and between the second winding roller and the pressure roller group.

[0024] Furthermore, an encoder is provided between the second unwinding roller and the second winding roller.

[0025] Furthermore, a pressure roller fixing steel plate is provided on the equipment panel, a slide groove is provided on the pressure roller fixing steel plate, two sliding blocks slidably connected to the slide groove are provided in the slide groove, a support frame is provided on the sliding block, the first pressure roller and the second pressure roller are respectively provided on the two support frames, a hydraulic cylinder is provided at one end of the support frame, and the hydraulic cylinder is used to drive the support frame to move along the direction of the slide groove.

[0026] Furthermore, a visual inspection device is provided below the pressing roller group, and the visual inspection device is used to inspect the composite copper-lithium composite strip.

[0027] Furthermore, it also includes a control module, which is electrically connected to the visual detection device and the hydraulic cylinder, and is used to analyze the detection result of the visual detection device and adjust the working state of the hydraulic cylinder according to the detection result.

[0028] The present invention utilizes the pressure between two pressing rollers to compound the lithium strip with the copper foil to form a copper-lithium composite strip, and realizes the intermittent compounding of the copper foil and lithium by controlling the horizontal direction of the pressing roller to form an intermittent copper-lithium composite strip, thereby effectively improving the efficiency of the copper-lithium composite strip production and providing more composite strip materials for customer battery design. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The figure is an overall schematic diagram of a device for preparing a spaced copper-lithium composite belt according to the present invention.

[0030] Figure 2 This is a schematic diagram of a pressure roller fixing steel plate of a device for preparing a spaced copper-lithium composite strip of the present invention.

[0031] Among them, 1-equipment panel; 2-first pressure roller; 3-second pressure roller; 4-first unwinding roller; 5-second unwinding roller; 6-third unwinding roller; 7-first winding roller; 8-second winding roller; 9-third winding roller; 10-first over roller; 11-second over roller; 12-third over roller; 13-fourth over roller; 14-tension roller; 15-encoder; 16-pressure roller fixing steel plate; 17-slider; 18-support frame; 19-hydraulic cylinder; 20-visual detection device; 21-control module. DETAILED DESCRIPTION

[0032] In order to achieve the above-mentioned purpose and effect, the technical means and structures adopted by the present invention are described in detail with reference to the accompanying drawings for the features and functions of the preferred embodiments of the present invention.

[0033] The present invention provides a method for preparing a spaced copper-lithium composite tape, comprising the following steps:

[0034] S1. Prepare two rolls of lithium tape and one roll of copper foil tape, wherein the width of the copper foil tape should be greater than or equal to the width of the lithium tape.

[0035] S2, placing the copper foil strip between the two lithium strips and aligning the midlines of the three strips in the length direction;

[0036] S3, taking up and releasing the copper foil strip and the lithium strip by means of a spaced copper-lithium composite strip preparation device;

[0037] S4. During the retraction and release, the copper foil strip and the lithium strip are compounded by intermittent pressing through the intermittent copper-lithium composite strip preparation, and the lithium strip is compounded on both sides of the copper foil strip at intervals.

[0038] Specifically, in step S4, during the compounding, the compounded copper-lithium composite belt is detected at the same time, and the frequency of the intermittent compounding and the duration of a single compounding are adjusted according to the required length of the lithium replenishing zone and the actual length of the compounded lithium replenishing zone, thereby adjusting the length of the lithium replenishing zone.

[0039] In this embodiment, when only one side of the copper foil strip needs to be coated with lithium, one roll of the lithium strip is replaced with a polypropylene film, thereby achieving single-sided lithium coating while protecting the copper foil strip.

[0040] like Figure 1-2 As shown, the present invention also provides a spaced copper-lithium composite belt preparation device, which is used in the above preparation method, comprising:

[0041] Equipment panel 1;

[0042] A pressing roller group, which is arranged on the equipment panel 1, and includes a first pressing roller 2 and a second pressing roller 3 which are arranged horizontally. The first pressing roller 2 and the second pressing roller 3 can move toward or away from each other, so that intermittent lamination is achieved through the movement of the first pressing roller 2 and the second pressing roller 3;

[0043] The unwinding group is arranged above the pressure roller group, and includes a first unwinding roller 4, a second unwinding roller 5 and a third unwinding roller 6 which are arranged horizontally in sequence;

[0044] The winding group is arranged below the pressure roller group, and includes a first winding roller 7, a second winding roller 8 and a third winding roller 9 which are arranged in sequence horizontally;

[0045] A first lithium ribbon is arranged on the first unwinding roller 4, and the other end of the first lithium ribbon passes through between the first pressing roller 2 and the second pressing roller 3 and is connected to the first winding roller 7;

[0046] The second unwinding roller 5 is provided with a copper foil tape, and the other end of the copper foil tape passes through between the first pressing roller 2 and the second pressing roller 3 and is connected to the second winding roller 8;

[0047] The third unwinding roller 6 is provided with a second lithium ribbon, and the other end of the second lithium ribbon passes through between the first pressing roller 2 and the second pressing roller 3 and is connected to the third winding roller 9 .

[0048] In actual use, the staff first sets the leading end of the first lithium tape on the first unwinding roller 4, passes the end of the first lithium battery through the first pressure roller 2 and the second pressure roller 3 and winds it around the first winding roller 7, then sets the leading end of the copper foil tape on the second unwinding roller 5, passes the end of the copper foil tape between the first pressure roller 2 and the second pressure roller 3 and winds it around the second winding roller 8, and finally sets the leading end of the second lithium tape on the third unwinding roller 6, passes the end of the second lithium battery through the first pressure roller 2 and the second pressure roller 3 and winds it around the third winding roller 9, completing the installation preparation. At this time, the copper foil tape is located between the first lithium tape and the second lithium tape.

[0049] The device is started to continuously convey the first lithium belt, the copper foil belt and the second lithium belt to their respective ends. During the conveyance, the first pressing roller 2 and the second pressing roller 3 continuously reciprocate. When the first pressing roller 2 and the second pressing roller 3 are close to each other, the two pressing rollers will press the first lithium belt, the copper foil belt and the second lithium belt together. At this time, the two pressing rollers keep rotating and apply pressure to the first lithium belt, the copper foil belt and the second lithium belt, so that a certain thickness of lithium is attached to the copper foil belt to form a lithium supplement area on the copper foil belt. When the first pressing roller 2 and the second pressing roller 3 are away from each other, the first lithium belt, the copper foil belt and the second lithium belt are no longer pressed together to form a blank area on the copper foil belt. This cycle is repeated to make lithium supplement areas and blank areas appear alternately on the copper-lithium composite belt, thereby realizing the production of intermittent copper-lithium composite belts.

[0050] Specifically, the materials used may be copper foil and lithium ribbon, graphite ribbon and lithium ribbon, and other corresponding composite solid materials.

[0051] Specifically, a first roller 10 is provided between the pressure roller group and the first unwinding roller 4, a second roller 11 is provided between the pressure roller group and the first winding roller 7, a third roller 12 is provided between the pressure roller group and the third unwinding roller 6, and a fourth roller 13 is provided between the pressure roller group and the third winding roller 9. This prevents the material from warping and ensures the neatness of the material.

[0052] Specifically, the number and position of the rollers can be set according to the actual production scale to meet the production needs of different scales.

[0053] Specifically, tension rollers 14 are arranged between the first roller 10 and the pressure roller group, between the second roller 11 and the pressure roller group, between the third roller 12 and the pressure roller group, between the fourth roller 13 and the pressure roller group, between the second unwinding roller 5 and the pressure roller group, and between the second winding roller 8 and the pressure roller group. Thus, the tension of the lithium belt and the copper foil belt is controlled so that the belts can be stably conveyed.

[0054] Specifically, an encoder 15 is provided between the second unwinding roller 5 and the second winding roller 8 to record the length of the processed intermittent copper-lithium composite strip.

[0055] In another embodiment, a roller fixing steel plate 16 is provided on the equipment panel 1, a slide groove is provided on the roller fixing steel plate 16, two sliders 17 slidably connected to the slide groove are provided in the slide groove, a support frame 18 is provided on the slider 17, the first roller 2 and the second roller 3 are respectively provided on the two support frames 18, and a hydraulic cylinder 19 is provided at one end of the support frame 18, and the hydraulic cylinder 19 is used to drive the support frame 18 to move along the direction of the slide groove. Thus, the first roller 2 and the second roller 3 are controlled to approach or move away by the extension and contraction of the two hydraulic cylinders 19.

[0056] In another embodiment, a visual inspection device 20 is disposed below the roller group, and the visual inspection device 20 is used to inspect the composite copper-lithium composite belt to determine whether the copper-lithium composite belt meets the standards.

[0057] In another embodiment, a control module 21 is further included. The control module 21 is electrically connected to the visual inspection device 20 and the hydraulic cylinder 19. The control module 21 is used to analyze the inspection result of the visual inspection device 20 and adjust the working state of the hydraulic cylinder 19 according to the inspection result.

[0058] During specific use, the specific lengths of the lithium replenishment area and the blank area are set first, and the control module 21 calculates the required tape running time for the lithium replenishment area and the blank area according to the set tape running speed, and controls the time for the first pressure roller 2 and the second pressure roller 3 to approach and move away from each other according to the tape running time.

[0059] After the copper-lithium composite strip is processed, the visual inspection device 20 will inspect it, and the control module 21 will compare the result with the set value. If the difference between the two exceeds the allowable error range, the control module 21 will adjust the time for the first pressing roller 2 and the second pressing roller 3 to approach and move away from each other until the processed copper-lithium composite strip meets the standards.

[0060] The above descriptions are only preferred embodiments of the present invention, not all embodiments. Anyone should be aware that any structural changes made under the inspiration of the present invention, and any technical solutions that are the same or similar to the present invention, belong to the protection scope of the present invention.

Claims

1. A method for preparing a spaced copper-lithium composite tape, characterized in that: The following steps are involved: S1. Prepare two rolls of lithium tape and one roll of copper foil tape; S2, placing the copper foil strip between the two lithium strips and aligning the three strips; S3, taking up and releasing the copper foil strip and the lithium strip by means of a spaced copper-lithium composite strip preparation device; S4. During the retraction and release, the copper foil strip and the lithium strip are intermittently composited by preparing the intermittent copper-lithium composite strip, and the lithium strip is composited on both sides of the copper foil strip.

2. The method for preparing a spaced copper-lithium composite tape according to claim 1, characterized in that: In step S4, during the recombination, the composite copper-lithium composite belt is tested, and the frequency of the intermittent recombination and the duration of a single recombination are adjusted according to the actual length of the lithium supplementation zone.

3. The method for preparing a spaced copper-lithium composite tape according to claim 2, characterized in that: In step S1, when single-sided lithium coating is required, one of the lithium ribbon rolls is replaced with a polypropylene film.

4. A spaced copper-lithium composite tape preparation device, used in the preparation method according to any one of claims 1 to 3, characterized in that: include: Equipment panel (1); A pressing roller group, the pressing roller group being arranged on the equipment panel (1), the pressing roller group comprising a first pressing roller (2) and a second pressing roller (3) arranged horizontally, the first pressing roller (2) and the second pressing roller (3) being capable of moving towards or away from each other; An unwinding group, the unwinding group is arranged above the pressure roller group, and comprises a first unwinding roller (4), a second unwinding roller (5) and a third unwinding roller (6) which are arranged in sequence horizontally; A winding group, the winding group is arranged below the pressure roller group, and comprises a first winding roller (7), a second winding roller (8) and a third winding roller (9) which are arranged in sequence horizontally; A first lithium ribbon is arranged on the first unwinding roller (4), and the other end of the first lithium ribbon passes through between the first pressing roller (2) and the second pressing roller (3) and is connected to the first winding roller (7); The second unwinding roller (5) is provided with a copper foil strip, and the other end of the copper foil strip passes through between the first pressing roller (2) and the second pressing roller (3) and is connected to the second winding roller (8); The third unwinding roller (6) is provided with a second lithium ribbon, and the other end of the second lithium ribbon passes through between the first pressing roller (2) and the second pressing roller (3) and is connected to the third winding roller (9).

5. A spaced copper-lithium composite tape preparation device as claimed in claim 4, characterized in that: A first passing roller (10) is arranged between the pressure roller group and the first unwinding roller (4), a second passing roller (11) is arranged between the pressure roller group and the first winding roller (7), a third passing roller (12) is arranged between the pressure roller group and the third unwinding roller (6), and a fourth passing roller (13) is arranged between the pressure roller group and the third winding roller (9).

6. A spaced copper-lithium composite tape preparation device as claimed in claim 5, characterized in that: Tension rollers (14) are provided between the first passing roller (10) and the pressure roller group, between the second passing roller (11) and the pressure roller group, between the third passing roller (12) and the pressure roller group, between the fourth passing roller (13) and the pressure roller group, between the second unwinding roller (5) and the pressure roller group, and between the second winding roller (8) and the pressure roller group.

7. A spaced copper-lithium composite tape preparation device as claimed in claim 4, characterized in that: An encoder (15) is provided between the second unwinding roller (5) and the second winding roller (8).

8. A spaced copper-lithium composite tape preparation device as claimed in claim 4, characterized in that: The equipment panel (1) is provided with a roller fixing steel plate (16), the roller fixing steel plate (16) is provided with a slide groove, the slide groove is provided with two sliders (17) slidably connected to the slide groove, the slider (17) is provided with a support frame (18), the first roller (2) and the second roller (3) are respectively provided on the two support frames (18), and a hydraulic cylinder (19) is provided at one end of the support frame (18), and the hydraulic cylinder (19) is used to drive the support frame (18) to move along the direction of the slide groove.

9. A spaced copper-lithium composite tape preparation device as claimed in claim 8, characterized in that: A visual inspection device (20) is arranged below the pressing roller group, and the visual inspection device (20) is used to inspect the composite copper-lithium composite strip.

10. The device for preparing a spaced copper-lithium composite tape according to claim 9, characterized in that: The invention also comprises a control module (21), wherein the control module (21) is electrically connected to the visual detection device (20) and the hydraulic cylinder (19), and the control module (21) is used to analyze the detection result of the visual detection device (20) and adjust the working state of the hydraulic cylinder (19) according to the detection result.

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