A lithium battery pole copper strip retracting device

Abstract

The present invention discloses a copper strip retracting device for lithium battery pole pieces, including a copper strip unwinding device, the copper strip unwinding device including an unwinding shaft, an unwinding motor and a copper strip barrel for storing the copper strip, the copper strip barrel being sleeved on the rewinding shaft, the unwinding motor being rotationally connected to the unwinding shaft and driving the unwinding shaft to rotate, and conveying the copper strip on the copper strip barrel to the side of the lithium supplement pole piece with the lithium film and entering the pole piece rewinding device at the same time as the lithium supplement pole piece. The present invention uses a copper strip unwinding device to attach a copper strip to the side of the lithium supplement pole piece with the lithium film when rewinding the lithium supplement pole piece, to separate the stacked lithium supplement pole pieces, to avoid the lithium supplement pole piece from heating up or catching fire when the pole piece rewinding device is rewinding, and to eliminate safety hazards in production.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production and processing equipment, and in particular to a lithium battery pole piece copper strip retracting and releasing device. Background Art

[0002] At present, the lithium battery industry at home and abroad has a good development prospect. Lithium-ion batteries have been widely used in portable appliances such as laptops, cameras, and mobile communications due to their unique performance advantages. At present, large-capacity lithium-ion batteries for transmission and reception have begun to be tested in electric vehicles and are expected to become one of the main power sources for electric vehicles in the 21st century. They will also be used in artificial satellites, aerospace, and energy storage. With the shortage of energy and the pressure of environmental protection in the world, lithium batteries are widely used in the electric vehicle industry, especially the emergence of high-energy density material batteries, which has promoted the development and application of the lithium battery industry.

[0003] In the battery production process, the lithium replenishment process of lithium-ion battery pole pieces is a key technology to increase the capacity of lithium-ion batteries. In the lithium replenishment process, the lithium replenishment pole pieces need to be rolled up, because when the pole pieces come into contact with the lithium film, a certain amount of heat will be generated by the reaction, and the lithium replenishment pole pieces are stacked and rolled up in the pole piece winding device. Therefore, when the lithium replenishment pole pieces are rolled up, they will generate heat and easily catch fire, which poses a certain safety risk.

[0004] The above defects need to be improved. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a lithium battery pole piece copper strip retracting and releasing device.

[0006] The technical solution of the present invention is as follows:

[0007] A lithium battery electrode copper strip retracting device comprises a copper strip unwinding device, wherein the copper strip unwinding device comprises an unwinding shaft, an unwinding motor and a copper strip material drum for storing the copper strip, wherein the copper strip material drum is sleeved on the rewinding shaft, the unwinding motor is rotatably connected to the unwinding shaft and drives the unwinding shaft to rotate, and the copper strip on the copper strip material drum is transported to the side of the lithium replenishing electrode with the lithium film and enters the electrode rewinding device at the same time as the lithium replenishing electrode.

[0008] According to the above-mentioned scheme of the present invention, the unwinding shaft includes a first hollow shaft body with an opening at one end, a first limiting hole is arranged at a relative position on the side surface of the first hollow shaft body, a first tightening block is arranged in the first limiting hole, the inner side of the relative first tightening block is a wedge-shaped surface, the first tightening block is elastically connected to the first hollow shaft body, a first push rod is arranged in the first hollow shaft body, a first wedge-shaped push block is arranged at the position of the first push rod corresponding to the first tightening block, and the inward end of the first push rod is elastically connected to the inner side of the closed end surface of the first hollow shaft body.

[0009] Furthermore, the unwinding shaft is provided with a first barrel pushing device for pushing out the copper strip barrel.

[0010] Furthermore, it includes a first belt feeding device, which is arranged between the copper belt unwinding device and the electrode winding device. The first belt feeding device transports the copper belt to the side of the lithium-replenishing electrode with the lithium film and enters the electrode winding device at the same time as the lithium-replenishing electrode.

[0011] Furthermore, the first belt feeding device includes a first belt pressing device and a first belt transporting device, the first belt pressing device includes a first pressing block and a first pressing cylinder for pressing the copper belt, the first pressing cylinder is drivingly connected to the first pressing block,

[0012] The first belt transport device includes a first belt feeding gear and a first belt feeding rack plate, the first belt feeding rack plate is meshed with the first belt feeding gear, and the first pressing cylinder is arranged on the first rack plate.

[0013] Furthermore, a correction device for correcting the position of the copper strip is provided on the unwinding shaft, a correction sensor is provided between the copper strip unwinding device and the first strip feeding device, and the correction sensor is electrically connected to the correction device.

[0014] The present invention according to the above scheme further includes a copper strip winding device, which includes a winding shaft, a winding motor and a winding drum for storing the copper strip, the winding drum is sleeved on the winding shaft, the winding motor is rotatably connected to the winding shaft and drives the winding shaft to rotate, after the pole piece comes out of the pole piece unwinding device, the copper strip on the pole piece is transported to the copper strip winding device and wound by the winding drum.

[0015] Furthermore, the winding shaft includes a second hollow shaft body with an opening at one end, a second limiting hole is arranged at a relative position on the side of the second hollow shaft body, a second tightening block is arranged in the second limiting hole, the inner side of the relative second tightening block is a wedge-shaped surface, the second tightening block is elastically connected to the second hollow shaft body, a second push rod is arranged in the second hollow shaft body, a second push rod is arranged at a position corresponding to the second tightening block, and the inward end of the second push rod is elastically connected to the inner side of the closed end surface of the second hollow shaft body.

[0016] Furthermore, the winding shaft is provided with a second barrel pushing device for pushing out the winding barrel.

[0017] Furthermore, it further includes a second tape feeding device, which is arranged between the copper tape winding device and the pole piece unwinding device, and the second tape feeding device conveys the copper tape on the pole piece to the copper tape winding device, and is wound up by the winding drum.

[0018] Furthermore, the second belt feeding device includes a second belt pressing device and a second belt transporting device, the second belt pressing device includes a second pressing block and a second pressing cylinder for pressing the copper belt, the second pressing cylinder is drivingly connected to the second pressing block,

[0019] The second belt transport device includes a second belt feeding gear and a second belt feeding rack plate, the second belt feeding rack plate is meshed with the second belt feeding gear, and the second pressing cylinder is arranged on the second rack plate.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention uses a copper strip unwinding device to attach a copper strip to the side of the lithium supplementing electrode sheet with the lithium film when winding the lithium supplementing electrode sheet to separate the stacked lithium supplementing electrode sheets, thereby preventing the lithium supplementing electrode sheet from heating up or catching fire when the electrode sheet winding device is winding the lithium supplementing electrode sheet, thereby eliminating potential safety hazards in production;

[0022] 2. The present invention separates and recycles the copper strip of the electrode with the copper strip through the copper strip winding device, so that the electrode can smoothly undergo the subsequent calendering and coating processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the connection between a copper strip unwinding device and a pole piece winding device according to an embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the connection between the copper strip unwinding device and the pole piece winding device according to another embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the connection between a copper strip winding device and a pole piece unwinding device according to an embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of the connection between the copper strip winding device and the electrode unwinding device according to another embodiment of the present invention.

[0027] In the figure,

[0028] 1. Copper strip unwinding device; 2. Copper strip; 3. Lithium supplement electrode; 4. Electrode winding device; 5. First tape feeding device; 6. Copper strip winding device; 7. Electrode; 8. Electrode unwinding device; 9. Second tape feeding device. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] It should be noted that when a component is referred to as being "sleeved on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and should not be construed as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features.

[0031] See also Figure 1 The embodiment of the present invention provides a lithium battery pole piece copper strip retracting and unwinding device, including a copper strip unwinding device 1, the copper strip unwinding device 1 includes an unwinding shaft, an unwinding motor and a copper strip barrel for storing a copper strip 2, the copper strip barrel is sleeved on the rewinding shaft, the unwinding motor is rotatably connected to the unwinding shaft and drives the unwinding shaft to rotate, and the copper strip 2 on the copper strip barrel is transported to the side of the lithium supplement pole piece 3 with the lithium film and enters the pole piece rewinding device 4 at the same time as the lithium supplement pole piece 3, and is rewound together by the pole piece rewinding device 4. When in use, the copper strip 2 and the lithium supplement pole piece 3 are manually pulled to the pole piece rewinding device 4, and the copper strip 2 is located on the side of the lithium supplement pole piece 3 with the lithium film, and then the system is started, and the copper strip 2 and the lithium supplement pole piece 3 can be rewound together in the pole piece rewinding device 4. When the pole piece 7 and the lithium film are in contact, a certain amount of heat will be generated by the reaction, and the lithium-replenishing pole piece 3 is stacked and rolled up in the pole piece winding device 4, so the lithium-replenishing pole piece 3 will generate heat when it is rolled up, and it is easy to catch fire, which poses a certain safety risk. When the present invention rolls up the lithium-replenishing pole piece 3, a copper strip 2 is attached to the side of the lithium-replenishing pole piece 3 with the lithium film to separate the stacked lithium-replenishing pole piece 3, so as to avoid the lithium-replenishing pole piece 3 from heating up and catching fire when the pole piece winding device 4 is rolled up, thereby eliminating safety hazards in production.

[0032] In one embodiment, the unwinding shaft comprises a first hollow shaft body with an opening at one end, a first limiting hole is provided at a relative position on the side of the first hollow shaft body, a first tightening block is provided in the first limiting hole, the inner side of the first tightening block is a wedge-shaped surface, the first tightening block is elastically connected to the first hollow shaft body, a first push rod is provided in the first hollow shaft body, a first wedge-shaped push block is provided at the position of the first push rod corresponding to the first tightening block, and the inward end of the first push rod is elastically connected to the inner side of the closed end surface of the first hollow shaft body. After the unwinding shaft adopts the above structure, the copper strip barrel is sleeved on the first hollow shaft body, the first push rod is pushed inward, the first wedge-shaped push block squeezes the first tightening block, and the first tightening block extends from the first limiting hole to the inner side wall of the copper strip barrel, thereby achieving the effect of locking the copper strip barrel and avoiding the copper strip barrel from loosening during rotation, causing the copper strip 2 to become loose due to insufficient tension. In addition, in order to facilitate the ejection of the empty copper strip barrel, the unwinding shaft is provided with a first barrel ejection device for ejecting the copper strip barrel.

[0033] See also Figure 2 In one embodiment, the lithium battery electrode copper tape retracting device further includes a first tape feeding device 5, which is arranged between the copper tape unwinding device 1 and the electrode retracting device 4. The first tape feeding device 5 transports the copper tape 2 to the side of the lithium supplement electrode 3 with the lithium film and enters the electrode retracting device 4 at the same time as the lithium supplement electrode 3. Specifically, the first tape feeding device 5 includes a first tape pressing device and a first tape transporting device. The first tape pressing device includes a first pressing block and a first pressing cylinder for pressing the copper tape 2. The first pressing cylinder is drivingly connected to the first pressing block. The first tape transporting device includes a first tape feeding gear and a first tape feeding rack plate. The first tape feeding rack plate is meshed with the first tape feeding gear, and the first pressing cylinder is arranged on the first rack plate. When in use, the copper belt 2 is manually pulled to the first belt pressing device, the first pressing cylinder drives the first pressing block to press the copper belt 2, the first belt feeding gear rotates to drive the first belt feeding rack plate to move, and the copper belt 2 is transported to the side of the lithium replenishing electrode 3 with the lithium film and enters the electrode winding device 4 at the same time as the lithium replenishing electrode 3.

[0034] Furthermore, a correction device for correcting the position of the copper strip 2 is provided on the unwinding shaft, and a correction sensor is provided between the copper strip unwinding device 1 and the first tape feeding device 5, and the correction sensor is electrically connected to the correction device. Because the position of the copper strip 2 deviates due to mechanical structure vibration or other factors during the unwinding process of the copper strip barrel, it cannot be well ensured that the copper strip 2 is placed on the side of the lithium supplementing electrode 3 with the lithium film, so the correction sensor and the correction device can solve this problem well. When the correction sensor senses that the position of the copper strip 2 deviates, the correction device can adjust the position of the unwinding shaft for correction.

[0035] See also Figure 3In one embodiment, the copper strip reeling device for the lithium battery pole piece further includes a copper strip reeling device 6, which includes a reeling shaft, a reeling motor and a reeling drum for storing the copper strip 2. The reeling drum is sleeved on the reeling shaft, and the reeling motor is rotatably connected to the reeling shaft and drives the reeling shaft to rotate. After the pole piece 7 comes out of the pole piece unwinding device 8, the copper strip 2 on the pole piece 7 is transported to the copper strip reeling device 6 and reeled by the reeling drum. When in use, the copper strip 2 on the pole piece 7 is manually pulled onto the reeling drum of the copper strip reeling device 6, and then the system is started, and the copper strip 2 on the pole piece 7 can be reeled into the reeling drum of the copper strip reeling device 6. Because some pole pieces 7 are separated by copper strip 2, when using pole pieces 7 with copper strip 2, it is necessary to use the copper strip reeling device 6 to separate the copper strip 2 on the pole piece 7 for recycling, otherwise the subsequent calendering and laminating processes cannot be carried out.

[0036] In one embodiment, the winding shaft includes a second hollow shaft body with an opening at one end, a second limiting hole is provided at a relative position on the side of the second hollow shaft body, a second expansion block is provided in the second limiting hole, the inner side of the relative second expansion block is a wedge-shaped surface, the second expansion block is elastically connected to the second hollow shaft body, a second push rod is provided in the second hollow shaft body, a second wedge-shaped push block is provided at the position of the second push rod corresponding to the second expansion block, and the inward end of the second push rod is elastically connected to the inner side of the closed end surface of the second hollow shaft body. After the winding shaft adopts the above structure, the winding barrel is sleeved on the second hollow shaft body, the second push rod is pushed inward, the second wedge-shaped push block squeezes the second expansion block, and the second expansion block extends from the second limiting hole to abut against the inner side wall of the winding barrel, thereby achieving the effect of locking the winding barrel and preventing the winding barrel from loosening during rotation, causing the copper strip 2 to become loose due to insufficient tension. In addition, in order to facilitate the ejection of the empty winding barrel, a second barrel ejection device for ejecting the winding barrel is provided on the winding shaft.

[0037] See also Figure 4 In one embodiment, the lithium battery electrode copper tape retracting device further includes a second tape feeding device 9, which is disposed between the copper tape reeling device 6 and the electrode unreeling device 8. The second tape feeding device 9 transports the copper tape 2 on the electrode 7 to the copper tape reeling device 6, which is reeled by the reeling drum. Specifically, the second tape feeding device 9 includes a second tape pressing device and a second tape transporting device. The second tape pressing device includes a second pressing block and a second pressing cylinder for pressing the copper tape 2. The second pressing cylinder is drivingly connected to the second pressing block. The second tape transporting device includes a second tape feeding gear and a second tape feeding rack plate. The second tape feeding rack plate is meshed with the second tape feeding gear, and the second pressing cylinder is disposed on the second rack plate. When in use, the copper tape 2 on the pole piece 7 is manually pulled to the second tape pressing device, the second pressing cylinder drives the second pressing block to press the copper tape 2, the second tape feeding gear rotates to drive the second tape feeding rack plate to move, and the copper tape 2 on the pole piece 7 is transported to the copper tape winding device 6, and is wound by the winding drum.

[0038] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

[0039] The above is an exemplary description of the present invention in conjunction with the accompanying drawings. It is obvious that the implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A lithium battery pole piece copper strip retracting device, characterized in that: include: A copper strip unwinding device, comprising an unwinding shaft, an unwinding motor and a copper strip barrel for storing the copper strip, wherein the copper strip barrel is sleeved on a winding shaft, the unwinding motor is rotatably connected to the unwinding shaft and drives the unwinding shaft to rotate, and the copper strip on the copper strip barrel is transported to the side of the lithium replenishing electrode sheet with the lithium film and enters the electrode sheet winding device at the same time as the lithium replenishing electrode sheet, and a first barrel pushing device for pushing out the copper strip barrel is provided on the unwinding shaft; A copper strip winding device, the copper strip winding device includes a winding shaft, a winding motor and a winding drum for storing the copper strip, the winding drum is sleeved on the winding shaft, the winding motor is rotatably connected to the winding shaft and drives the winding shaft to rotate, after the pole piece comes out of the pole piece unwinding device, the copper strip on the pole piece is transported to the copper strip winding device and wound by the winding drum, and the winding shaft is provided with a second drum pushing device for pushing out the winding drum.

2. The lithium battery pole piece copper strip taking-up and releasing device according to claim 1, characterized in that: The unwinding shaft includes a first hollow shaft body with an opening at one end, a first limiting hole is arranged at a relative position on the side surface of the first hollow shaft body, a first tightening block is arranged in the first limiting hole, the inner side of the first tightening block is a wedge-shaped surface, the first tightening block is elastically connected to the first hollow shaft body, a first push rod is arranged in the first hollow shaft body, a first wedge-shaped push block is arranged at the position of the first push rod corresponding to the first tightening block, and the inward end of the first push rod is elastically connected to the inner side of the closed end surface of the first hollow shaft body.

3. The lithium battery pole piece copper strip taking-up and releasing device according to claim 1, characterized in that: It further includes a first belt feeding device, which is arranged between the copper belt unwinding device and the electrode winding device. The first belt feeding device transports the copper belt to the side of the lithium-replenishing electrode with the lithium film and enters the electrode winding device at the same time as the lithium-replenishing electrode.

4. The lithium battery pole piece copper strip taking-up and releasing device according to claim 3, characterized in that: The first belt feeding device includes a first belt pressing device and a first belt transporting device. The first belt pressing device includes a first pressing block and a first pressing cylinder for pressing the copper belt. The first pressing cylinder is drivingly connected to the first pressing block. The first belt transport device includes a first belt feeding gear and a first belt feeding rack plate, the first belt feeding rack plate is meshed with the first belt feeding gear, and the first pressing cylinder is arranged on the first belt feeding rack plate.

5. The lithium battery pole piece copper strip taking-up and releasing device according to claim 3, characterized in that: The unwinding shaft is provided with a correction device for correcting the position of the copper strip, a correction sensor is provided between the copper strip unwinding device and the first strip feeding device, and the correction sensor is electrically connected to the correction device.

6. The lithium battery pole piece copper strip taking-up and releasing device according to claim 1, characterized in that: The winding shaft includes a second hollow shaft body with an opening at one end, a second limiting hole is arranged at a relative position on the side surface of the second hollow shaft body, a second tightening block is arranged in the second limiting hole, the inner side of the relative second tightening block is a wedge-shaped surface, the second tightening block is elastically connected to the second hollow shaft body, a second push rod is arranged in the second hollow shaft body, a second push rod is arranged at a position corresponding to the second tightening block, and the inward end of the second push rod is elastically connected to the inner side of the closed end surface of the second hollow shaft body.

7. The lithium battery pole piece copper strip taking-up and releasing device according to claim 1, characterized in that: It further includes a second tape feeding device, which is arranged between the copper tape winding device and the pole piece unwinding device. The second tape feeding device conveys the copper tape on the pole piece to the copper tape winding device, and is wound up by the winding drum.

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