Battery pole piece stripping apparatus

Abstract

This utility model provides a battery electrode stripping device, comprising: a conveying device, a hot-cold circulation device, and a stripping device; the hot-cold circulation device and the stripping device are spaced apart along a first direction, and the conveying device passes sequentially through the hot-cold circulation device and the stripping device along the first direction to transport the electrode sheet between the hot-cold circulation device and the stripping device; the hot-cold circulation device includes a heating module, a cooling module, a first roller, and a second roller, the first roller and the second roller are spaced apart along the first direction, the second roller is close to the stripping device, and the heating module and the cooling module are spaced apart along a second direction and located between the first roller and the second roller; the stripping device is used to strip the active material on the electrode sheet.

Description

Technical Field

[0001] This utility model relates to the field of battery recycling technology, specifically to a battery electrode stripping device. Background Technology

[0002] With the rapid development of my country's new energy vehicle industry, the installed capacity of power batteries is constantly increasing, and their retirement volume is also showing a rapid growth trend. It is predicted that by 2025, my country's retired power batteries will reach 820,000 tons, and by 2030, the cumulative retirement volume will exceed 3 million tons. These retired power batteries contain abundant valuable metals such as lithium, cobalt, and nickel. Effective recycling and utilization can not only reduce resource waste but also decrease dependence on imported mineral resources, resulting in significant economic and environmental benefits.

[0003] The electrodes of power batteries contain a large amount of recyclable metals. Currently, the mainstream process for recycling electrodes is physical crushing and sorting + wet leaching purification. The electrodes are crushed and separated by mechanical means, and then the target metal is dissolved into the solution using chemical reagents. High-purity metals are then extracted from the solution through precipitation, extraction, electrolysis and other methods.

[0004] The composition of electrodes is complex, and physical crushing and sorting makes it difficult to achieve efficient separation of the components in the electrodes, resulting in problems such as low production efficiency, low recovery rate and environmental pollution in the downstream wet leaching and purification process. Utility Model Content

[0005] This invention provides a lithium-ion battery positive electrode stripping device to solve the problems of low electrode recycling efficiency, low recycling rate and environmental pollution in the prior art.

[0006] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0007] This utility model provides a battery electrode stripping device, including: a conveying device, a hot and cold circulation device, and a stripping device;

[0008] The hot and cold circulation device and the stripping device are arranged at intervals along a first direction, and the conveying device passes sequentially through the hot and cold circulation device and the stripping device along the first direction to transport the electrode sheet between the hot and cold circulation device and the stripping device.

[0009] The hot and cold circulation device includes a heating module, a cooling module, a first roller, and a second roller. The first roller and the second roller are spaced apart along the first direction. The second roller is close to the stripping device. The heating module and the cooling module are spaced apart along the second direction and located between the first roller and the second roller. When the conveying device transports the electrode sheet to the first roller, the electrode sheet is wound around the first roller and the second roller in sequence and circulates between the heating module and the cooling module.

[0010] The stripping device is used to strip the active material from the electrode.

[0011] Optionally, the conveying device includes an infeed roller and an outlet roller spaced apart along the first direction;

[0012] The feed roller is located on the side of the first roller away from the hot and cold circulation device, and the feed roller is used to transport the electrode sheet to the first roller.

[0013] The discharge roller is located on the side of the stripping device away from the hot and cold circulation device, and the discharge roller is used to transport the electrode sheet out.

[0014] Optionally, the conveying device further includes a transfer roller, which is disposed between the stripping device and the discharge roller, and is used to tighten the electrode sheet.

[0015] Optionally, the conveying device further includes a conveying shaft and a motor. The conveying shaft is arranged opposite to each other along a third direction. The two ends of the feed roller, the first roller, the second roller, the transfer roller and the discharge roller are rotatably connected to the conveying shaft. The motor is arranged on the conveying shaft and connected to the feed roller, the first roller, the second roller, the transfer roller and the discharge roller.

[0016] Optionally, the feed roller, the first roller, the second roller, the transfer roller, and the discharge roller have the same diameter.

[0017] Optionally, the first roller and the second roller are single rollers and rotate in the same direction.

[0018] Optionally, the stripping device includes a housing and brushes. The housing is provided with an inlet, an outlet, and a powder collection port. Two brushes are arranged opposite each other along the second direction between the inlet and the outlet. The powder collection port is located below the brushes along the third direction.

[0019] Optionally, the heating module includes a first housing and an electric heating wire disposed within the first housing, wherein the heating temperature of the electric heating wire is 100–150°C.

[0020] Optionally, the cooling module includes a second housing with a sidewall and a cooling pipe inside the sidewall for introducing a cooling medium.

[0021] Optionally, the battery electrode stripping equipment further includes a receiving device, which includes a powder box and a current collector. The powder box is disposed below the stripping device along a third direction, and the current collector is disposed on the side of the discharge roller away from the stripping device.

[0022] This invention provides a battery electrode stripping device. Before stripping the electrode, the electrode is circulated between a heating module and a cooling module. The hot-cold cycle reduces the connection strength between the active material and the current collector. The rapid heating and cooling cycle deactivates the binder, quickly reducing the adhesive effect of the binder, making it easier to strip the active material and the current collector in the subsequent stripping process, thereby improving the electrode recycling efficiency. Attached Figure Description

[0023] Figure 1 This is a top view of the battery electrode stripping device provided in this embodiment of the utility model;

[0024] Figure 2 yes Figure 1 The diagram shows a front view of the battery electrode stripping device.

[0025] Reference numerals: 10: Conveying device; 101: Conveying roller; 1011: Feeding roller; 1012: First roller; 1013: Second roller; 1014: Transfer roller; 1015: Discharge roller; 102: Conveying shaft; 103: Motor; 20: Hot and cold circulation device; 201: Heating module; 202: Cooling module; 30: Stripping device; 301: Box; 302: Brush; 40: Receiving device; 401: Powder box; 402: Collector box; 50: Electrode; X: First direction; Y: Second direction; Z: Third direction. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the fixed scope of the present utility model.

[0027] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0028] This utility model provides a battery electrode stripping device, including: a conveying device 10, a hot and cold circulation device 20, and a stripping device 30; the hot and cold circulation device 20 and the stripping device 30 are arranged at intervals along a first direction X, and the conveying device passes sequentially through the hot and cold circulation device 20 and the stripping device 30 along the first direction X to transport the electrode 50 between the hot and cold circulation device 20 and the stripping device 30; the hot and cold circulation device 20 includes a heating module 201, a cooling module 202, a first roller 1012, and a second roller 1013, the first roller 1012 and the second roller 1013, the first roller 1012 and the second roller 1013, the second ... The second roller 1013 is spaced apart along the first direction X and is close to the peeling device 30. The heating module 201 and the cooling module 202 are spaced apart along the second direction Y and are located between the first roller 1012 and the second roller 1013. When the conveying device 10 transports the electrode 50 to the first roller 1012, the electrode 50 is wound around the first roller 1012 and the second roller 1013 in sequence and circulates between the heating module 201 and the cooling module 202. The peeling device 30 is used to peel off the active material on the electrode 50.

[0029] Figure 1 A top view of the battery electrode stripping device in this embodiment is shown. Figure 2 A front view of the battery electrode stripping device in this embodiment is shown.

[0030] The battery electrode stripping device in this embodiment is used to separate and recycle the active material and current collector of the electrode 50. Waste lithium-ion battery electrodes 50 are sequentially transported to the hot-cold circulating paper loading and stripping device 30 via the conveying device 10. The hot-cold circulating device 20 is used to pre-treat the electrode 50 to be stripped, reducing the activity of the binder between the active material and the current collector through alternating hot and cold treatment, facilitating the separation of the active material and the current collector in the subsequent stripping device 30. De-dusting methods can include crushing and screening, air classification, and blade stripping.

[0031] In actual production, the binder in electrode 50 is usually PVDF (polyvinylidene fluoride). Repeated heating and freezing gradually deactivate the PVDF binder, achieving a gentle separation of the active material from the current collector. This method is simple to operate, requiring only ordinary ovens and freezing equipment, without complex instruments or chemical solvents, significantly reducing processing costs and ensuring environmental safety. Compared to chemical dissolution or mechanical crushing, thermal cooling does not produce toxic waste liquid or damage the structure of the active material. The treated material retains good performance and can be directly recycled. After 3-5 cycles of heating at 150℃ and freezing at -20℃, the active material can naturally detach. This method is suitable for various positive and negative electrode 50 applications, is simple to operate, has a high recovery rate, and is environmentally friendly.

[0032] Specifically, the hot and cold circulation device 20 in this embodiment includes a heating module 201, a cooling module 202, a first roller 1012, and a second roller 1013. For example... Figure 1 As shown, the heating module 201 and the cooling module 202 are arranged side by side along the second direction Y, with a certain gap maintained between them. Appropriate insulation measures can be taken to prevent the heating module 201 and the cooling module 202, which have large temperature differences, from interfering with each other, affecting normal operation, or even reducing the service life of the equipment. The first roller 1012 and the second roller 1013 are respectively disposed on both sides of the heating module 201 and the cooling module 202. The electrode sheet 50 is wound back and forth around the first roller 1012 and the second roller 1013 to circulate between the heating module 201 and the cooling module 202.

[0033] It should be noted that in this embodiment, the electrode 50 should first enter the heating module 201 through the first roller 1012, be heated by the heating module 201, and then be transported to the second roller 1013. The second roller 1013 then sends the electrode 50 into the cooling module 202, where it is cooled before returning to the first roller 1012 for the next cycle or being transported to the stripping module for separation. This heating-then-cooling cycle ensures that the electrode 50 is in a cooled state when it enters the stripping device 30 after completing the hot-cold cycle, preventing damage to the stripping device 30 due to high temperatures and extending the service life of the equipment.

[0034] Understandable, such as Figure 2As shown, the number of times the electrode 50 is repeatedly wound between the first roller 1012 and the second roller 1013 is the number of cycles of the electrode 50. The number of heating modules 201 and cooling modules 202 can be the same as or different from the number of cycles of the electrode 50. When the heating modules 201 and cooling modules 202 are in one group, the electrode 50 repeatedly enters the same group of heating modules 201 and cooling modules 202 to circulate. When there are multiple groups of heating modules 201 and cooling modules 202 and the number of cycles is the same, the multiple groups of heating modules 201 and cooling modules 202 are arranged side by side between the first roller 1012 and the second roller 1013, and the electrode 50 enters multiple groups of heating modules 201 and cooling modules 202 in sequence to circulate. Of course, the number of heating modules 201 and cooling modules 202 can be multiple but not equal to the number of cycles. The electrode 50 can circulate back and forth multiple times in some heating modules 201 and cooling modules 202, and only pass through one or even none in other heating modules 201 and cooling modules 202. In this way, a set of battery electrode stripping equipment can be used for various types of electrode sheets 50. Different types of electrode sheets 50 may have different optimal number of cycles. The winding situation of the electrode sheets 50 on the first roller 1012 and the second roller 1013 and the circulation situation in one or more sets of heating modules 201 and cooling modules 202 can be flexibly adjusted according to the actual working conditions.

[0035] In some alternative embodiments, the conveying device 10 includes a feed roller 1011 and a discharge roller 1015 spaced apart along a first direction X; the feed roller 1011 is located on the side of the first roller 1012 away from the hot and cold circulation device 20, and the feed roller 1011 is used to transport the electrode 50 to the first roller 1012; the discharge roller 1015 is located on the side of the peeling device 30 away from the hot and cold circulation device 20, and the discharge roller 1015 is used to transport the electrode 50 out.

[0036] The feed roller 1011 and the discharge roller 1015 are respectively located at both ends of the battery electrode stripping device, serving a traction function to pull the electrode 50 to be processed from the feed roller. In this embodiment, the feed roller 1011 and the discharge roller 1015 are opposite rollers, with the electrode 50 clamped between the two rollers. In some other embodiments, the feed roller 1011 and the discharge roller 1015 can also be single rollers, with the electrode 50 directly wound on the roller.

[0037] In some alternative embodiments, the conveying device 10 also includes a transfer roller 1014, which is disposed between the stripping device 30 and the discharge roller 1015, and is used to tighten the electrode sheet 50.

[0038] The intermediate roller 1014 is set between the stripping device 30 and the discharge roller 1015. By adjusting the rotation speed and tension, the electrode 50 is tightened to ensure that the stripped electrode 50 is kept flat during transportation. This avoids the electrode 50 becoming loose and affecting its transportation and processing, ensuring continuous production. It can also adjust the spacing and rotation speed of each roller according to the thickness and material of the electrode 50, making the processing process more stable and controllable.

[0039] In some alternative embodiments, the conveying device 10 further includes a conveying shaft 102 and a motor 103. The conveying shaft 102 is arranged opposite each other along the third direction Z. The two ends of the feed roller 1011, the first roller 1012, the second roller 1013, the transfer roller 1014 and the discharge roller 1015 are rotatably connected to the conveying shaft 102. The motor 103 is arranged on the conveying shaft 102 and connected to the feed roller 1011, the first roller 1012, the second roller 1013, the transfer roller 1014 and the discharge roller 1015.

[0040] In this embodiment, two sets of conveyor shafts 102 are provided before and after the stripping device 30. The first set of conveyor shafts 102 is located in front of the stripping device 30, and a feed roller 1011, a first roller 1012, and a second roller 1013 are rotatably connected between the two oppositely arranged conveyor shafts 102, which are responsible for feeding the electrode sheet 50 and handling the hot and cold cycle. The second set of conveyor shafts 102 is located behind the stripping device 30, and a transfer roller 1014 and a discharge roller 1015 are rotatably connected between the two oppositely arranged conveyor shafts 102, which are responsible for stripping and discharging the electrode sheet 50.

[0041] The feed roller 1011, first roller 1012, and second roller 1013 on the first set of conveyor shafts 102 have one driving end, sharing the same motor 103 via gear transmission, and the other end is the driven end; the transfer roller 1014 and discharge roller 1015 on the second set of conveyor shafts 102 also share another motor 103 via gear transmission. This achieves synchronous rotation of all rollers in the same set of conveyor shafts 102.

[0042] In some alternative embodiments, the feed roller 1011, the first roller 1012, the second roller 1013, the transfer roller 1014, and the discharge roller 1015 have the same diameter.

[0043] In this embodiment, all conveyor rollers 101 adopt a uniform diameter specification. The identical diameter of the conveyor rollers 101 ensures that the linear velocity of each contact point of the electrode 50 is completely consistent during conveying, guaranteeing uniform transmission of the electrode 50. The unified mechanical structure allows for the use of the same components, reducing the types of components that need to be procured and stocked, and all rollers are interchangeable. Furthermore, this standardized design also makes the tension distribution of the entire conveying system more balanced, preventing stress concentration in the transition area of ​​the electrode 50.

[0044] In some alternative embodiments, the first roller 1012 and the second roller 1013 are single rollers and rotate in the same direction to meet the requirement that the electrode 50 is wound and circulated on the first roller 1012 and the second roller 1013.

[0045] Furthermore, the specific order in which the electrode 50 enters the heating module 201 and the cooling module 202 is related to the positions of the heating module 201 and the cooling module 202, as well as the rotation direction of the first roller 1012 and the second roller 1013. Figure 1 and Figure 2 For example, when the first roller 1012 and the second roller 1013 rotate counterclockwise, the heating module 201 and the cooling module 202 are sequentially arranged along the second direction Y shown in the figure, and the opposite is true when they rotate clockwise.

[0046] In some alternative embodiments, the stripping device 30 includes a housing 301 and brushes 302. The housing 301 is provided with an inlet, an outlet and a powder collection port. Two brushes 302 are arranged opposite each other along the second direction Y between the inlet and the outlet. The powder collection port is located below the brushes 302 along the third direction Z.

[0047] like Figure 1 As shown, in this embodiment, the stripping device 30 uses a brush 302 to remove powder. The electrode 50 conveyed by the second roller 1013 enters the box 301 through the feed port on the box 301. The brush 302 strips the active material on both sides of the electrode 50 into powder. The active material powder enters the powder collection port below. After the stripping is completed, the electrode 50 retains only the current collector with aluminum foil or copper foil as the substrate, and is output through the discharge port.

[0048] The housing 301 is mainly used to collect the active material powder after peeling, preventing it from splashing. The brush 302 flexibly peels the active material from both sides of the current collector. After the hot-cold cycle treatment, the activity of the PVDF binder on the electrode 50 decreases significantly, and the bonding strength between the active material and the current collector weakens. The friction between the electrode 50 and the brush 302 can separate the current collector from the surface active material. Compared to traditional mechanical scraping methods, this flexible peeling process effectively peels off the active material without damaging the current collector, effectively reducing the breakage rate of the current collector and the impurity content in the active material. This facilitates the repair and regeneration of the recovered material, achieving high-value recycling of resources while ensuring production efficiency.

[0049] In some embodiments, the brush 302 can be a roller brush 302, and the electrode 50 passes between two opposing brushes 302. Through the high-speed rotation of the roller, the brushes 302 on the roller surface come into contact with the surface of the electrode 50, thereby separating the active material from the current collector.

[0050] In addition, in some optional embodiments, the heating module 201 includes a first housing and an electric heating wire disposed within the first housing, wherein the heating temperature of the electric heating wire is 100-150°C.

[0051] The heating module 201 uses induction heating, and the electric heating wires evenly distributed in the first housing form eddy currents. The electrode 50 is treated as a whole at a temperature of 100-150°C for 10 minutes.

[0052] In some alternative embodiments, the cooling module 202 includes a second housing having a sidewall and a cooling pipe therein for introducing a cooling medium.

[0053] The second housing has a cooling chamber in which the electrode 50 is indirectly cooled. The cooling medium used is R22 (difluorochloromethane), which can reduce the temperature of the electrode 50 to -20 to 0°C.

[0054] In some alternative embodiments, the battery electrode stripping device also includes a receiving device 40, which includes a powder box 401 and a current collector 402. The powder box 401 is disposed below the stripping device 30 along the third direction Z, and the current collector 402 is disposed on the side of the discharge roller 1015 away from the stripping device 30.

[0055] The powder box 401 is used to collect the active material that has settled down under gravity after being processed by the stripping device 30, and the collector box 402 is used to collect the collector material after stripping, which is transported by the discharge roller 1015.

[0056] This utility model provides a battery electrode stripping device. The device utilizes a conveying device, a hot-cold circulation device, a stripping device, and a collecting device to strip the electrode sheets. Before stripping, the electrode sheets are circulated between a heating module and a cooling module. This hot-cold circulation reduces the bonding strength between the active material and the current collector. The rapid heating and cooling cycle deactivates the binder, quickly reducing its adhesive effect and making it easier to separate the active material and current collector during the subsequent stripping process, thus improving the electrode sheet recycling efficiency. Recycling and reusing the stripped active material and current collector has considerable economic value and is of great significance for addressing the resource and environmental problems caused by the retirement of power batteries.

[0057] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0058] Although alternative embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the alternative embodiments as well as all changes and modifications falling within the scope of the present invention.

[0059] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity from another, and do not necessarily require or imply any such actual relationship or order between these entities. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or terminal device that includes that element.

[0060] The technical solution provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the principle and implementation of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery electrode stripping device, characterized in that, include: Conveying device (10), hot and cold circulation device (20), and stripping device (30); The hot and cold circulation device (20) and the stripping device (30) are arranged at intervals along a first direction (X), and the conveying device passes sequentially through the hot and cold circulation device (20) and the stripping device (30) along the first direction (X) to transport the electrode sheet (50) between the hot and cold circulation device (20) and the stripping device (30). The hot and cold circulation device (20) includes a heating module (201), a cooling module (202), a first roller (1012) and a second roller (1013). The first roller (1012) and the second roller (1013) are spaced apart along the first direction (X). The second roller (1013) is close to the stripping device (30). The heating module (201) and the cooling module (202) are spaced apart along the second direction (Y) and located between the first roller (1012) and the second roller (1013). When the conveying device (10) transports the electrode (50) to the first roller (1012), the electrode (50) is wound around the first roller (1012) and the second roller (1013) in sequence and circulates between the heating module (201) and the cooling module (202). The stripping device (30) is used to strip the active material from the electrode (50).

2. The battery electrode sheet peeling apparatus according to claim 1, characterized by, The conveying device (10) includes a feed roller (1011) and a discharge roller (1015) spaced apart along the first direction (X); The feed roller (1011) is located on the side of the first roller (1012) away from the hot and cold circulation device (20), and the feed roller (1011) is used to transport the electrode (50) to the first roller (1012); The discharge roller (1015) is located on the side of the stripping device (30) away from the hot and cold circulation device (20), and the discharge roller (1015) is used to transport the electrode sheet (50) out.

3. The battery electrode sheet peeling apparatus according to claim 2, characterized by, The conveying device (10) further includes a transfer roller (1014), which is disposed between the stripping device (30) and the discharge roller (1015). The transfer roller (1014) is used to tighten the electrode sheet (50).

4. The battery electrode stripping device according to claim 3, characterized in that, The conveying device (10) further includes a conveying shaft (102) and a motor (103). The conveying shaft (102) is arranged opposite each other along a third direction (Z). The two ends of the feed roller (1011), the first roller (1012), the second roller (1013), the transfer roller (1014), and the discharge roller (1015) are rotatably connected to the conveying shaft (102). The motor (103) is arranged on the conveying shaft (102) and connected to the feed roller (1011), the first roller (1012), the second roller (1013), the transfer roller (1014), and the discharge roller (1015).

5. The battery electrode stripping device according to claim 3, characterized in that, The feed roller (1011), the first roller (1012), the second roller (1013), the transfer roller (1014), and the discharge roller (1015) have the same diameter.

6. The battery electrode stripping device according to claim 1, characterized in that, The first roller (1012) and the second roller (1013) are single rollers and rotate in the same direction.

7. The battery electrode sheet peeling apparatus according to claim 1, characterized by, The stripping device (30) includes a housing (301) and brushes (302). The housing (301) is provided with an inlet, an outlet and a powder collection port. Two brushes (302) are arranged opposite each other along the second direction (Y) between the inlet and the outlet. The powder collection port is located below the brushes (302) along the third direction (Z).

8. The battery electrode sheet peeling apparatus according to claim 1, characterized by, The heating module (201) includes a first housing and an electric heating wire disposed in the first housing, wherein the heating temperature of the electric heating wire is 100-150°C.

9. The battery electrode sheet peeling apparatus according to claim 1, characterized by, The cooling module (202) includes a second housing with a side wall and a cooling pipe inside the side wall for introducing a cooling medium.

10. The battery electrode sheet peeling apparatus according to claim 2, characterized by, The battery electrode stripping device also includes a receiving device (40), which includes a powder box (401) and a current collector (402). The powder box (401) is arranged below the stripping device (30) along a third direction (Z), and the current collector (402) is arranged on the side of the discharge roller (1015) away from the stripping device (30).

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