CN220447266U - Rolling device and battery processing equipment - Google Patents
Rolling device and battery processing equipment Download PDFInfo
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- CN220447266U CN220447266U CN202323008651.9U CN202323008651U CN220447266U CN 220447266 U CN220447266 U CN 220447266U CN 202323008651 U CN202323008651 U CN 202323008651U CN 220447266 U CN220447266 U CN 220447266U
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- 238000012545 processing Methods 0.000 title claims abstract description 10
- 238000005096 rolling process Methods 0.000 title claims description 68
- 238000003825 pressing Methods 0.000 claims abstract description 27
- 230000006835 compression Effects 0.000 claims abstract description 19
- 238000007906 compression Methods 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims description 18
- 239000010410 layer Substances 0.000 abstract description 158
- 239000011148 porous material Substances 0.000 abstract description 33
- 239000002344 surface layer Substances 0.000 abstract description 29
- 238000000034 method Methods 0.000 abstract description 9
- 238000003475 lamination Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 20
- 239000011149 active material Substances 0.000 description 18
- 230000008569 process Effects 0.000 description 7
- 238000004804 winding Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000005056 compaction Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 206010040954 Skin wrinkling Diseases 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The application relates to a roll-in device and battery processing equipment, roll-in device includes: the first feeding roller is used for conveying the target pole piece; the second feeding roller comprises a first roller body and a second roller body which are respectively arranged at two opposite sides of the first feeding roller along the radial direction of the first feeding roller, and the first roller body and the second roller body are both used for conveying the buffer layer; and the compression roller assembly is arranged at the downstream of the first feeding roller and the second feeding roller along the conveying direction of the target pole piece and is used for applying pressure to the target pole piece. According to the method, the buffer layer is arranged on at least one side of the target pole piece in a lamination mode along the thickness direction of the target pole piece through the second feeding roller, so that the buffer layer can be clamped between the press roll assembly and the target pole piece, the pressure of the press roll assembly is transferred to the target pole piece, indirect pressing is formed between the press roll assembly and the target pole piece, the probability of pore closed holes in the surface layer of the target pole piece can be reduced, and therefore battery performance is improved.
Description
Technical Field
The application relates to the technical field of battery processing, in particular to a rolling device and battery processing equipment.
Background
The pole piece is an important part for forming a battery structure, after the pole piece is manufactured, the pole piece is firstly rolled to improve the energy density of the pole piece, and the pole piece after rolling is used for assembling to form the battery.
However, the pole piece is a porous electrode, and after the pole piece is rolled, the pore of the pole piece surface layer is closed or the pore diameter of the pole piece surface layer is suddenly reduced, so that the multiplying power of the assembled battery is reduced, the low-temperature performance is reduced, and the problems of lithium precipitation, the reduction of the cycle life of the battery and the like are easily caused.
Disclosure of Invention
Accordingly, it is necessary to provide a rolling device and a battery processing apparatus for solving the problem that the pore of the surface layer is closed or the pore diameter of the surface layer is suddenly reduced after the rolling of the pole piece.
In a first aspect, the present application provides a rolling device for rolling a target pole piece, the rolling device comprising:
the first feeding roller is used for conveying the target pole piece;
the second feeding roller comprises a first roller body and a second roller body which are respectively arranged at two opposite sides of the first feeding roller along the radial direction of the first feeding roller, and the first roller body and the second roller body are both used for conveying the buffer layer so that the buffer layer is laminated at two opposite sides of the target pole piece along the thickness direction of the target pole piece; and
And the compression roller assembly is arranged at the downstream of the first feeding roller and the second feeding roller along the conveying direction of the target pole piece and is used for applying pressure to the target pole piece.
Through the structure, the first roller body and the second roller body can respectively layer the buffer layer on the two opposite sides of the thickness direction of the target pole piece, so that the target pole piece is clamped between the buffer layers, pressure transmission between the target pole piece and the compression roller assembly is realized through the buffer layers, direct contact rolling between the target pole piece and the compression roller assembly can be avoided, a protective effect is formed on the target pole piece, the probability that the compression roller assembly forms roller pressure on active material particles on the target pole piece in the direction parallel to the target pole piece is reduced, the probability that pores on the surface layer of the target pole piece are closed is reduced, the surface porosity of the target pole piece is improved, and the service performance of a battery cell or a battery is improved.
In some embodiments, the press roll assembly includes a first press roll and a second press roll disposed axially in parallel, the first press roll and the second press roll being disposed in a direction intersecting the axial direction at intervals and forming a roll gap therebetween for passing the stacked target pole piece and the buffer layer.
Through the structure, the first press roller and the second press roller are matched with each other, so that more uniform and stable pressure can be applied to the target pole piece, and the energy density of the target pole piece is improved. Meanwhile, the buffer layer transmits the pressure of the first press roller and the pressure of the second press roller to the target pole piece respectively, so that the target pole piece does not need to be in direct contact with the first press roller or the second press roller, and the probability of pore closed pores on the surface layer of the target pole piece is reduced.
In some embodiments, the rolling device further comprises a first receiving roller and a second receiving roller which are arranged at the downstream of the compression roller assembly along the conveying direction, wherein the first receiving roller is used for rolling the target pole piece, and the second receiving roller is arranged at least one side of the first receiving roller and is used for rolling the buffer layer.
Through setting up first receipts material roller, mutually support with first pan feeding roller, make the target pole piece can be in the tensioning state in the roll-in device, reduce the risk that the target pole piece is wrinkled. Likewise, the second receiving roller and the second feeding roller are matched with each other, so that the buffer layer is in a tensioning state in the rolling device and is better laminated with the target pole piece, and the press roller assembly can better roll the buffer layer and the target pole piece.
In some embodiments, the material of the buffer layer is the same as the material of the target pole piece; and/or the thickness of the buffer layer is the same as the thickness of the target pole piece.
In a second aspect, the present application also provides a rolling device for rolling a target pole piece, the rolling device comprising:
the first feeding roller is used for conveying the target pole piece;
the second feeding roller comprises a first roller body and a second roller body which are respectively arranged at two opposite sides of the first feeding roller;
the buffer layer comprises a first buffer sub-layer wound on the first roller body and a second buffer sub-layer wound on the second roller body, and the first buffer sub-layer and the second buffer sub-layer are stacked on two opposite sides of the target pole piece along the thickness direction of the target pole piece; and
The compression roller assembly is arranged at the downstream of the first feeding roller and the second feeding roller along the conveying direction of the target pole piece and is used for applying pressure to the target pole piece;
the buffer layer is positioned between the target pole piece and the compression roller assembly along the thickness direction of the target pole piece.
When the press roller assembly rolls the laminated target pole piece and the buffer layer, the first buffer sub-layer and the second buffer sub-layer can clamp the target pole piece between the laminated target pole piece and the buffer layer, the target pole piece and the press roller assembly are changed from direct contact to indirect contact, and the target pole piece can be protected while pressure is transferred, so that the probability of pore closed holes on the surface layer of the target pole piece is reduced.
In some embodiments, the material of the first buffer sub-layer and/or the second buffer sub-layer is the same as the material of the target pole piece. When the first buffer sub-layer and the second buffer sub-layer are laminated with the target pole piece, active material particles on the surfaces of the first buffer sub-layer and the second buffer sub-layer can be mutually meshed with active material particles on the surfaces of the target pole piece, so that roller pressure, formed by the roller assembly on the target pole piece, in the direction parallel to the target pole piece is further restrained, and the porosity of the surface layer of the target pole piece is further improved.
In some embodiments, the thickness of the first buffer sub-layer and/or the second buffer sub-layer is the same as the thickness of the target pole piece. Therefore, on one hand, the pressure transmitted to the target pole piece through the first buffer sub-layer and the second buffer sub-layer is suitable, the compaction of the target pole piece can be smoothly realized, and the energy density of the target pole piece is improved. On the other hand, the probability of pore closed pores on the surface layer of the target pole piece can be reduced.
In some embodiments, the press roller assembly comprises a first press roller and a second press roller which are axially arranged in parallel, wherein the first press roller and the second press roller are arranged at intervals along the direction intersecting with the axial direction, and a roll gap for passing through a target pole piece and a buffer layer which are arranged in a stacked manner is formed at intervals;
the first press roller is used for being in contact with the first buffer sub-layer, and the second press roller is used for being in contact with the second buffer sub-layer.
Through the structure, the first press roller and the second press roller are matched with each other, so that more uniform and stable pressure can be applied to the target pole piece, and the energy density of the target pole piece is improved. Meanwhile, the first buffer sub-layer transmits the pressure of the first press roller to the target pole piece, and the second buffer sub-layer transmits the pressure of the second press roller to the target pole piece, so that the target pole piece does not need to be in direct contact with the first press roller or the second press roller, and the probability of pore closed holes in the surface layer of the target pole piece is reduced.
In some embodiments, the rolling device further comprises a first receiving roller and a second receiving roller which are arranged at the downstream of the compression roller assembly along the conveying direction, wherein the first receiving roller is used for rolling the target pole piece, and the second receiving roller is arranged at least one side of the first receiving roller and is used for rolling the buffer layer.
Through setting up first receipts material roller, mutually support with first pan feeding roller, make the target pole piece can be in the tensioning state in the roll-in device, reduce the risk that the target pole piece is wrinkled. Likewise, the second receiving roller and the second feeding roller are matched with each other, so that the buffer layer is in a tensioning state in the rolling device and is better laminated with the target pole piece, and the press roller assembly can better roll the buffer layer and the target pole piece.
In a third aspect, the present application also provides a battery processing apparatus comprising the rolling device as described above.
Above-mentioned roll-in device and battery processing equipment, in the in-process of rolling in to the target pole piece, through the second pan feeding roller with the buffer layer along the range upon range of setting in at least one side of target pole piece of thickness direction of target pole piece for the buffer layer can press from both sides between compression roller subassembly and the target pole piece, and on the pressure transmission to the target pole piece from compression roller subassembly, make to form indirect pressure between compression roller subassembly and the target pole piece, from this, in being applied to the equipment of battery with the target pole piece after the roll-in is accomplished, can reduce the probability that target pole piece top layer hole closed cell to promote battery performance.
Drawings
Fig. 1 is a schematic diagram of a rolling apparatus according to one or more embodiments.
Fig. 2 is a partial schematic view of a roller press in accordance with one or more embodiments in place of a roller press assembly.
Reference numerals illustrate: 100. a rolling device; 200. a target pole piece; 10. a first feed roll; 20. a second feed roll; 30. a press roll assembly; 40. a buffer layer; 50. a first receiving roller; 60. a second receiving roller; 21. a first roller body; 22. a second roller body; 31. a first press roller; 32. a second press roller; 41. a first buffer sub-layer; 42. and a second buffer sub-layer.
Detailed Description
In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.
In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., these terms refer to the orientation or positional relationship based on the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.
In this application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.
Currently, the application of power batteries is more widespread from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and other fields. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.
The battery cell is the smallest unit constituting the battery, and the battery cell includes an electrode assembly, which is a component in which electrochemical reactions occur, a case, and a top cap. The electrode assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet are collectively called a sheet, on which active material particles for reacting with an electrolyte are coated, the active material particles are stacked together, and gaps between the active material particles are formed as a porous structure of the sheet.
After the pole pieces are formed, they are typically subjected to a roll-pressing process to increase their energy density and then reused for assembly to form a battery cell or battery. In the rolling process, pressure is applied to the active material particles coated on the surface layer of the pole piece, so that the active material particles are mutually close to each other and pressed, and the active material particles may be crushed even under the action of the pressure.
Therefore, gaps among active material particles on the surface layer of the pole piece become smaller or even disappear, and the pore diameter of the surface layer of the pole piece is suddenly reduced or the pore holes on the surface layer of the pole piece are closed. In this way, when the pole piece is used for assembling and forming a battery cell or a battery, the problems of reduced multiplying power and low-temperature performance of the battery cell or the battery, easy lithium precipitation of the battery, reduced cycle life of the battery and the like are caused.
Based on the above, in order to solve the problem that the pore of the surface layer is closed or the pore diameter of the surface layer is suddenly reduced after the pole piece is rolled, one or more embodiments of the present application provide a rolling device, in the process of rolling the target pole piece, the buffer layer is laminated and arranged on at least one side of the target pole piece along the thickness direction of the target pole piece through the second feeding roller, so that the buffer layer can be clamped between the press roller assembly and the target pole piece, and the pressure from the press roller assembly is transferred to the target pole piece, so that indirect pressing is formed between the press roller assembly and the target pole piece, therefore, the target pole piece is applied to the assembly of the battery after the rolling is completed, the probability of closing the pore of the surface layer of the target pole piece can be reduced, and the battery performance is improved.
Referring to fig. 1 and 2, an embodiment of a rolling device 100 is provided for rolling a target pole piece 200, where the rolling device 100 includes a first feeding roller 10, a second feeding roller 20, and a pressing roller assembly 30. The first feeding roller 10 is used for conveying the target pole piece 200, the second feeding roller 20 comprises a first roller body 21 and a second roller body 22 which are respectively arranged on two opposite sides of the first feeding roller 10 along the radial direction of the first feeding roller 10, and the first roller body 21 and the second roller body 22 are both used for conveying the buffer layer 40, so that the buffer layer 40 is laminated on two opposite sides of the target pole piece 200 along the thickness direction of the target pole piece 200. The press roller assembly 30 is disposed downstream of the first and second feed rollers 10 and 20 in the conveying direction of the target pole piece 200, and serves to apply pressure to the target pole piece 200.
The rolling device 100 is a structure capable of applying pressure to the target pole piece 200 and rolling the target pole piece 200. The target pole piece 200 can be rolled to increase energy density for assembly to form a battery cell or battery. The target electrode sheet 200 may be a positive electrode sheet or a negative electrode sheet. When the target electrode sheet 200 is a positive electrode sheet, positive electrode active material particles are coated on the target electrode sheet 200. When the target electrode sheet 200 is a negative electrode sheet, the target electrode sheet 200 is coated with negative electrode active material particles.
The first feeding roller 10 refers to a component for introducing the target pole piece 200 into the rolling device 100, and the target pole piece 200 can be conveyed in the rolling device 100 in the process of winding the target pole piece 200 on the first feeding roller 10 and rotating along with the first feeding roller 10.
The second feeding roller 20 is a member for introducing the buffer layer 40 into the rolling device 100, and the buffer layer 40 can be transported in the rolling device 100 during the process of winding the buffer layer 40 on the second feeding roller 20 and rotating with the second feeding roller 20.
The second feeding roller 20 is disposed on at least one side of the first feeding roller 10, and the buffer layer 40 wound on the second feeding roller 20 can be synchronously conveyed with the target pole piece 200 and is stacked on at least one side of the target pole piece 200 along the thickness direction of the target pole piece 200.
The press roller assembly 30 is a structure that applies pressure to the target pole piece 200 to roll the target pole piece 200. The target pole piece 200 introduced by the first feed roller 10 is disposed in a layered relationship with the buffer layer 40 introduced by the second feed roller 20 and passes through the press roller assembly 30 in common. Wherein the press roller assembly 30 rolls the target pole piece 200 in the thickness direction of the target pole piece 200, and the buffer layer 40 is located between the target pole piece 200 and the press roller assembly 30 in the thickness direction of the target pole piece 200.
Therefore, when the press roller assembly 30 rolls the target pole piece 200, the press roller assembly 30 directly applies pressure to the buffer layer 40, and then the buffer layer 40 transfers the pressure to the target pole piece 200, so that the direct contact rolling of the press roller assembly 30 and the target pole piece 200 is avoided.
Therefore, through the above structure, the buffer layer 40 introduced by the second feeding roller 20 can realize pressure transmission between the target pole piece 200 and the press roller assembly 30, and can avoid direct contact rolling between the target pole piece 200 and the press roller assembly 30, so that the probability that the press roller assembly 30 forms roller pressure on active material particles on the target pole piece 200 in a direction parallel to the target pole piece 200 can be reduced, the probability that pores on the surface layer of the target pole piece 200 are closed is reduced, the porosity on the surface layer of the target pole piece 200 is improved, and the service performance of a battery cell or a battery is improved.
Specifically, the first roller body 21 and the second roller body 22 are respectively disposed on two opposite sides of the first feeding roller 10 along the radial direction of the first feeding roller 10, and the buffer layer 40 is respectively wound on the first roller body 21 and the second roller body 22. Thus, the buffer layers 40 are respectively stacked on two opposite sides of the target pole piece 200 along the thickness direction of the target pole piece 200, that is, form a three-layer sandwich structure together with the target pole piece 200.
Through the structure, the first roller body 21 and the second roller body 22 can respectively laminate the buffer layers 40 on two opposite sides of the thickness direction of the target pole piece 200, so that the target pole piece 200 is clamped between the buffer layers 40, a protection effect is formed on the target pole piece 200, and the probability of pore closed pores on the surface layer of the target pole piece 200 is reduced.
In some embodiments, the press roller assembly 30 includes a first press roller 31 and a second press roller 32 disposed in parallel in an axial direction, and the first press roller 31 and the second press roller 32 are disposed at intervals along a direction intersecting the axial direction, and form a roll gap at intervals for passing the laminated target pole piece 200 and the buffer layer 40.
Specifically, the axial direction of the first press roller 31 and the axial direction of the second press roller 32 are disposed in parallel with each other, and the first press roller 31 and the second press roller 32 are disposed at a radial interval, with a rolling gap being formed therebetween.
The buffer layer 40 and the target pole piece 200 are sequentially stacked and then jointly penetrated in the rolling gap. In this process, the first press roller 31 and the second press roller 32 cooperate with each other to roll the buffer layer 40 and the target pole piece 200.
Through the above structure, the first press roller 31 and the second press roller 32 are matched with each other, a more uniform and stable pressure can be applied to the target pole piece 200, so as to increase the energy density of the target pole piece 200. Meanwhile, the buffer layer 40 transmits the pressure of the first compression roller 31 and the second compression roller 32 to the target pole piece 200 respectively, so that the target pole piece 200 does not need to be in direct contact with the first compression roller 31 or the second compression roller 32, and the probability of pore closed pores on the surface layer of the target pole piece 200 is reduced.
In some embodiments, the rolling device 100 further includes a first receiving roller 50 and a second receiving roller 60, both disposed downstream of the pressing roller assembly 30 along the conveying direction, the first receiving roller 50 is used for rolling the target pole piece 200, and the second receiving roller 60 is disposed on at least one side of the first receiving roller 50 and is used for rolling the buffer layer 40.
Specifically, the number of the second receiving rollers 60 is set corresponding to the number of the second feeding rollers 20, that is, when the second feeding rollers 20 are set to only one, that is, when the buffer layer 40 is laminated on only one side of the target pole piece 200, the second receiving rollers 60 are also set to one, and serve to wind up the buffer layer 40. When the second feeding rollers 20 are provided in two, i.e. the first roller body 21 and the second roller body 22, and are respectively used for conveying different buffer layers 40, the second receiving rollers 60 are also provided in two, and are respectively used for winding the corresponding buffer layers 40.
By arranging the first receiving roller 50 to be matched with the first feeding roller 10, the target pole piece 200 can be in a tensioning state in the rolling device 100, and the risk of wrinkling of the target pole piece 200 is reduced. Likewise, the second take-up roller 60 cooperates with the second feed roller 20 to place the buffer layer 40 in tension in the rolling apparatus 100 and to better laminate with the target pole piece 200 so that the press roller assembly 30 can better roll the buffer layer 40 and the target pole piece 200.
In some embodiments, the material of buffer layer 40 is the same as the material of target pole piece 200. And/or the thickness of the buffer layer 40 is the same as the thickness of the target pole piece 200.
Specifically, the buffer layer 40 may be made of the same material as the target pole piece 200, and the same active material particles are coated on the surface. When the buffer layer 40 and the target pole piece 200 are stacked, active material particles on the surface of the buffer layer 40 and active material particles on the surface of the target pole piece 200 can be mutually meshed, so that roller pressure, formed by the roller assembly 30 on the target pole piece 200 in a direction parallel to the target pole piece 200, is further restrained, and the surface porosity of the target pole piece 200 is further improved.
In addition, the thickness of the buffer layer 40 may affect the amount of actual pressure that the roller assembly 30 creates on the target pole piece 200.
Accordingly, the thickness of the buffer layer 40 is set to be the same as that of the target pole piece 200, so that the buffer layer 40 can smoothly transfer pressure between the press roller assembly 30 and the target pole piece 200. On the one hand, the pressure transmitted to the target pole piece 200 through the buffer layer 40 is appropriate, so that the compaction of the target pole piece 200 can be smoothly realized, and the energy density of the target pole piece 200 is improved. On the other hand, the probability of pore closed pores on the surface layer of the target pole piece 200 can be reduced.
In another embodiment of the present application, a rolling device 100 is further provided for rolling a target pole piece 200, where the rolling device 100 includes a first feeding roller 10, a second feeding roller 20, a buffer layer 40, and a pressing roller assembly 30. The first feeding roller 10 is used for conveying the target pole piece 200, and the second feeding roller 20 comprises a first roller body 21 and a second roller body 22 which are respectively arranged on two opposite sides of the first feeding roller 10. The buffer layer 40 includes a first buffer sub-layer 41 wound on the first roller 21 and a second buffer sub-layer 42 wound on the second roller 22, where the first buffer sub-layer 41 and the second buffer sub-layer 42 are stacked on opposite sides of the target pole piece 200 along the thickness direction of the target pole piece 200. The press roller assembly 30 is disposed downstream of the first and second feed rollers 10 and 20 in the conveying direction of the target pole piece 200, and serves to apply pressure to the target pole piece 200. Wherein the buffer layer 40 is located between the target pole piece 200 and the press roller assembly 30 in the thickness direction of the target pole piece 200.
The buffer layer 40 is a member that is laminated on at least one side of the target pole piece 200 in the thickness direction of the target pole piece 200 in the rolling process, and is capable of transmitting the pressure on the press roller assembly 30 to the target pole piece 200 at the time of rolling.
Specifically, the target pole piece 200 is wound on the first feeding roller 10, the buffer layer 40 is wound on the second feeding roller 20, and the first feeding roller 10 and the second feeding roller 20 synchronously rotate, so as to respectively drive the target pole piece 200 and the buffer layer 40 to move along the conveying direction. During the movement, the buffer layer 40 is stacked on at least one side of the target pole piece 200 in the thickness direction of the target pole piece 200 and passes through the press roller assembly 30 together with the target pole piece 200.
When the press roller assembly 30 rolls the laminated target pole piece 200 and the buffer layer 40, the buffer layer 40 is clamped between the press roller assembly 30 and the target pole piece 200, the direct contact between the target pole piece 200 and the press roller assembly 30 is changed into the indirect contact, and the target pole piece 200 can be protected while the pressure is transmitted, so that the probability of pore closed holes in the surface layer of the target pole piece 200 is reduced.
Specifically, the first roller body 21 and the second roller body 22 are respectively disposed on two opposite sides of the first feeding roller 10 along the radial direction of the first feeding roller 10, the first roller body 21 is wound with a first buffer sublayer 41, and the second roller body 22 is wound with a second buffer sublayer 42. Thus, the first buffer sub-layer 41 and the second buffer sub-layer 42 are respectively stacked on two opposite sides of the target pole piece 200 along the thickness direction of the target pole piece 200, that is, form a three-layer sandwich structure together with the target pole piece 200.
Through the structure, the first buffer sub-layer 41 and the second buffer sub-layer 42 can clamp the target pole piece 200 between the first buffer sub-layer and the second buffer sub-layer, so that a protective effect is formed on the target pole piece 200, and the probability of pore closed pores on the surface layer of the target pole piece 200 is reduced.
In some embodiments, the material of first buffer sub-layer 41 and/or second buffer sub-layer 42 is the same as the material of target pole piece 200.
Specifically, the first buffer sub-layer 41 and the second buffer sub-layer 42 may be made of the same material as the target pole piece 200, and the same active material particles are coated on the surface. When the first buffer sub-layer 41 and the second buffer sub-layer 42 are stacked with the target pole piece 200, active material particles on the surfaces of the first buffer sub-layer 41 and the second buffer sub-layer 42 and active material particles on the surface of the target pole piece 200 can be mutually meshed, so that roller pressure, formed by the roller assembly 30 on the target pole piece 200 in a direction parallel to the target pole piece 200, is further inhibited, and the porosity of the surface layer of the target pole piece 200 is further improved.
In some embodiments, thickness L1 of first buffer sub-layer 41 and/or second buffer sub-layer 42 is the same as thickness L2 of target pole piece 200.
Specifically, the thickness of first buffer sub-layer 41 and second buffer sub-layer 42 may affect the amount of actual pressure that pressure roller assembly 30 creates on target pole piece 200.
Accordingly, the thicknesses of the first buffer sub-layer 41 and the second buffer sub-layer 42 are each set to be the same as the thickness of the target pole piece 200, so that the first buffer sub-layer 41 and the second buffer sub-layer 42 can smoothly transfer pressure between the press roller assembly 30 and the target pole piece 200. On the one hand, the pressure transmitted to the target pole piece 200 through the first buffer sub-layer 41 and the second buffer sub-layer 42 is appropriate, so that the compaction of the target pole piece 200 can be smoothly realized, and the energy density of the target pole piece 200 is improved. On the other hand, the probability of pore closed pores on the surface layer of the target pole piece 200 can be reduced.
In some embodiments, the press roller assembly 30 includes a first press roller 31 and a second press roller 32 disposed in parallel in an axial direction, and the first press roller 31 and the second press roller 32 are disposed at intervals along a direction intersecting the axial direction, and form a roll gap at intervals for passing the laminated target pole piece 200 and the buffer layer 40. Wherein the first press roller 31 is adapted to be in contact with the first buffer sub-layer 41 and the second press roller 32 is adapted to be in contact with the second buffer sub-layer 42.
Specifically, the axial direction of the first press roller 31 and the axial direction of the second press roller 32 are disposed in parallel with each other, and the first press roller 31 and the second press roller 32 are disposed at a radial interval, with a rolling gap being formed therebetween.
The first buffer sub-layer 41, the target pole piece 200 and the second buffer sub-layer 42 are sequentially stacked and then jointly pass through the rolling gap. In this process, the first press roller 31 and the second press roller 32 cooperate with each other, and the first buffer sub-layer 41, the target pole piece 200, and the second buffer sub-layer 42 are rolled. Wherein, the first press roller 31 directly presses against the first buffer sub-layer 41, and the second press roller 32 directly presses against the second buffer sub-layer 42.
Through the above structure, the first press roller 31 and the second press roller 32 are matched with each other, a more uniform and stable pressure can be applied to the target pole piece 200, so as to increase the energy density of the target pole piece 200. At the same time, the first buffer sub-layer 41 transmits the pressure of the first press roller 31 to the target pole piece 200, and the second buffer sub-layer 42 transmits the pressure of the second press roller 32 to the target pole piece 200, so that the target pole piece 200 does not need to be in direct contact with the first press roller 31 or the second press roller 32, and the probability of pore closed pores on the surface layer of the target pole piece 200 is reduced.
In some embodiments, the rolling device 100 further includes a first receiving roller 50 and a second receiving roller 60, both disposed downstream of the pressing roller assembly 30 along the conveying direction, the first receiving roller 50 is used for rolling the target pole piece 200, and the second receiving roller 60 is disposed on at least one side of the first receiving roller 50 and is used for rolling the buffer layer 40.
Specifically, the number of the second receiving rollers 60 is set corresponding to the number of the second feeding rollers 20, that is, when the second feeding rollers 20 are set to only one, that is, when the buffer layer 40 is laminated on only one side of the target pole piece 200, the second receiving rollers 60 are also set to one, and serve to wind up the buffer layer 40. When the second feeding roller 20 is provided with two second feeding rollers, namely, the first roller body 21 and the second roller body 22, and are respectively used for conveying the first buffer sub-layer 41 and the second buffer sub-layer 42, the second receiving roller 60 is also provided with two second feeding rollers, and is respectively used for winding the first buffer sub-layer 41 and the second buffer sub-layer 42.
By arranging the first receiving roller 50 to be matched with the first feeding roller 10, the target pole piece 200 can be in a tensioning state in the rolling device 100, and the risk of wrinkling of the target pole piece 200 is reduced. Likewise, the second take-up roller 60 cooperates with the second feed roller 20 to place the buffer layer 40 in tension in the rolling apparatus 100 and to better laminate with the target pole piece 200 so that the press roller assembly 30 can better roll the buffer layer 40 and the target pole piece 200.
Based on the same concept as the rolling device 100 described above, the present application also provides a battery processing apparatus including the rolling device 100 described above.
According to one or more embodiments, the target pole piece 200 is wound on the first feeding roller 10, the first buffer sub-layer 41 is wound on the first roller body 21, the second buffer sub-layer 42 is wound on the second roller body 22, and the first buffer sub-layer 41 and the second buffer sub-layer 42 are respectively stacked on two opposite sides of the target pole piece 200 along the thickness direction of the target pole piece 200.
The first buffer sub-layer 41, the target pole piece 200 and the second buffer sub-layer 42 are jointly penetrated in the rolling gap, the first press roller 31 and the second press roller 32 are mutually matched, and pressure is applied to the first buffer sub-layer 41, the target pole piece 200 and the second buffer sub-layer 42. Meanwhile, the first buffer sublayer 41 transmits the pressure of the first press roller 31 to the target pole piece 200, the second buffer sublayer 42 transmits the pressure of the second press roller 32 to the target pole piece 200, so that the direct contact between the target pole piece 200 and the first press roller 31 and the second press roller 32 is changed into indirect contact, and on the basis of realizing smooth rolling, active material particles on the surface of the target pole piece 200 can be protected, thereby reducing the probability of pore closed pores on the surface layer of the target pole piece 200.
After the rolling is completed, the target pole piece 200 is rolled by the first material receiving roller 50, and the first buffer sub-layer 41 and the second buffer sub-layer 42 are respectively rolled by the second material receiving roller 60. The target pole piece 200 may be transported to a next process to be assembled into a battery cell or battery, and the first buffer sub-layer 41 and the second buffer sub-layer 42 may participate in the rolling process of the target pole piece 200 of the next batch.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. A roll-in device for roll-in of a target pole piece, the roll-in device comprising:
the first feeding roller is used for conveying the target pole piece;
the second feeding roller comprises a first roller body and a second roller body which are respectively arranged at two opposite sides of the first feeding roller along the radial direction of the first feeding roller, and the first roller body and the second roller body are both used for conveying a buffer layer so that the buffer layer is laminated at two opposite sides of the target pole piece along the thickness direction of the target pole piece; and
And the compression roller assembly is arranged at the downstream of the first feeding roller and the second feeding roller along the conveying direction of the target pole piece and is used for applying pressure to the target pole piece.
2. The roll pressing apparatus according to claim 1, wherein the roll pressing assembly includes a first roll pressing roller and a second roll pressing roller disposed in parallel in an axial direction, the first roll pressing roller and the second roll pressing roller being disposed at intervals in a direction intersecting the axial direction, and forming a roll pressing gap for passing the target pole piece and the buffer layer disposed in a stacked manner at intervals.
3. The roll-in device of claim 1, further comprising a first take-up roll and a second take-up roll, both disposed downstream of the press roll assembly along the conveying direction, the first take-up roll being configured to wind the target pole piece, the second take-up roll being disposed on at least one side of the first take-up roll and configured to wind the buffer layer.
4. The roll-in device of claim 1, wherein the material of the buffer layer is the same as the material of the target pole piece;
and/or the thickness of the buffer layer is the same as the thickness of the target pole piece.
5. A roll-in device for roll-in of a target pole piece, the roll-in device comprising:
the first feeding roller is used for conveying the target pole piece;
the second feeding roller comprises a first roller body and a second roller body which are respectively arranged at two opposite sides of the first feeding roller;
the buffer layer comprises a first buffer sub-layer wound on the first roller body and a second buffer sub-layer wound on the second roller body, and the first buffer sub-layer and the second buffer sub-layer are respectively stacked on two opposite sides of the target pole piece along the thickness direction of the target pole piece; and
The compression roller assembly is arranged at the downstream of the first feeding roller and the second feeding roller along the conveying direction of the target pole piece and is used for applying pressure to the target pole piece;
the buffer layer is located between the target pole piece and the compression roller assembly along the thickness direction of the target pole piece.
6. The rolling device of claim 5, wherein the material of the first buffer sub-layer and/or the second buffer sub-layer is the same as the material of the target pole piece.
7. The rolling device according to claim 5 or 6, characterized in that the thickness of the first buffer sub-layer and/or the second buffer sub-layer is the same as the thickness of the target pole piece.
8. The roll pressing apparatus according to claim 5, wherein the roll pressing assembly includes a first roll pressing roller and a second roll pressing roller disposed in parallel in an axial direction, the first roll pressing roller and the second roll pressing roller being disposed at intervals in a direction intersecting the axial direction, and forming a roll pressing gap for passing the target pole piece and the buffer layer disposed in a stacked manner at intervals;
the first press roller is used for being in contact with the first buffer sub-layer, and the second press roller is used for being in contact with the second buffer sub-layer.
9. The roll-in device of claim 5, further comprising a first take-up roll and a second take-up roll, both disposed downstream of the press roll assembly along the conveying direction, the first take-up roll configured to wind the target pole piece, the second take-up roll disposed on at least one side of the first take-up roll and configured to wind the buffer layer.
10. Battery processing apparatus comprising a rolling device according to any one of claims 1-4 or any one of claims 5-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323008651.9U CN220447266U (en) | 2023-11-08 | 2023-11-08 | Rolling device and battery processing equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323008651.9U CN220447266U (en) | 2023-11-08 | 2023-11-08 | Rolling device and battery processing equipment |
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| Publication Number | Publication Date |
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| CN220447266U true CN220447266U (en) | 2024-02-06 |
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| CN202323008651.9U Active CN220447266U (en) | 2023-11-08 | 2023-11-08 | Rolling device and battery processing equipment |
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| Country | Link |
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| CN (1) | CN220447266U (en) |
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