CN215815996U - Rolling and stacking structure, soft package battery and rolling and stacking device - Google Patents
Rolling and stacking structure, soft package battery and rolling and stacking device Download PDFInfo
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- CN215815996U CN215815996U CN202121357224.XU CN202121357224U CN215815996U CN 215815996 U CN215815996 U CN 215815996U CN 202121357224 U CN202121357224 U CN 202121357224U CN 215815996 U CN215815996 U CN 215815996U
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- 238000005096 rolling process Methods 0.000 title claims description 63
- 238000004804 winding Methods 0.000 claims abstract description 136
- 238000003475 lamination Methods 0.000 claims description 199
- 230000007246 mechanism Effects 0.000 claims description 104
- 210000000078 claw Anatomy 0.000 claims description 51
- 238000003825 pressing Methods 0.000 claims description 49
- 230000000712 assembly Effects 0.000 claims description 29
- 238000000429 assembly Methods 0.000 claims description 29
- 238000013519 translation Methods 0.000 claims description 13
- 230000007306 turnover Effects 0.000 claims description 5
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
本实用新型提供了一种卷叠结构、软包电池及卷叠装置，卷叠结构包括：多个正极极片；多个负极极片；以及，隔膜，所述隔膜具有折叠段和与所述折叠段相连的卷绕段，所述正极极片、所述隔膜和所述负极极片依次叠加，形成叠片结构体，所述隔膜对应所述叠片结构体的部分形成所述折叠段，所述卷绕段卷绕于所述叠片结构体上。本实用新型中通过采用负极极片、隔膜的折叠段和正极极片依次层叠，形成叠片结构体，采用卷绕段卷绕于叠片结构体上，使得卷绕段将叠片结构体中的隔膜、正极极片和负极极片包裹住，避免正极极片及负极极片靠近各层隔膜折叠部位的两侧膨胀变形，保障叠片结构体及软包电池的形状，提高软包电池的使用寿命和安全性。
The utility model provides a roll-up structure, a soft-pack battery and a roll-up device. The roll-up structure comprises: a plurality of positive pole pieces; a plurality of negative pole pieces; In the winding segment connected to the folded segment, the positive electrode, the separator and the negative electrode are stacked in sequence to form a laminated structure, and the part of the separator corresponding to the laminated structure forms the folded segment, The winding section is wound on the laminated structure body. In the present invention, the negative pole piece, the folded section of the separator and the positive pole piece are stacked in sequence to form a laminated structure body, and the winding section is used to wind the laminated structure body, so that the winding section is used to wrap the laminated structure in the laminated structure. The diaphragm, the positive electrode and the negative electrode are wrapped around it to avoid the expansion and deformation of both sides of the positive electrode and the negative electrode close to the folded part of each layer of the diaphragm, to ensure the shape of the laminated structure and the pouch battery, and to improve the performance of the pouch battery. longevity and safety.
Description
Technical Field
The utility model belongs to the technical field of batteries, and particularly relates to a rolling and stacking structure, a soft package battery and a rolling and stacking device.
Background
With the adoption of a large number of lithium batteries as power supplies in the fields of mobile phones, digital cameras, notebook computers, unmanned planes, electric tools, new energy automobiles, portable medical equipment and the like, the domestic lithium battery industry has been rapidly developed. The lithium battery manufacturing process mainly comprises a lamination process and a winding process, the lamination process and the winding process are important links for determining the performance of the lithium battery and the like, and the lamination process and the winding process are concerned.
The cylindrical battery is generally processed by a winding process, wherein the winding process of the cylindrical battery is to stack raw materials in the order of a negative electrode, a diaphragm, a positive electrode and the diaphragm, directly roll the raw materials into a cylinder by a winding method, and then place the cylinder in a metal shell. The winding process has the advantages of high manufacturing efficiency and low cost, and has the disadvantages of high internal resistance, poor multiplication rate, low energy density, poor heat dissipation, difficult thickness control, easy battery variability and the like.
The laminate of the soft package battery is processed by a general lamination process, the laminate of the soft package battery is a Z-shaped laminate, the positive pole piece strip and the negative pole piece strip are respectively cut into a plurality of positive pole pieces and a plurality of negative pole pieces during processing, then the positive pole pieces and the negative pole pieces are alternately superposed between the adjacent two side diaphragms during the Z-shaped folding process of the diaphragms, and finally the diaphragms are wrapped by an aluminum plastic shell for packaging. The lamination process has the advantages of low internal resistance, good multiplying power, high energy density, wide application range, difficult deformation, flexible size, good heat dissipation and the like, and has the defects of low manufacturing efficiency, high cost and the like.
Although both the winding process and the lamination process are used by battery manufacturers, for the power battery, the lamination process can better exert the advantages of the power battery cell, has the advantages over winding in the aspects of safety, energy density and process control, can better control the yield of the battery cell and achieve higher energy density, and is a preferred processing process of the power battery.
In the laminate technology's of "Z" font laminate technology laminate battery test, because the laminate adopts the laminate technology, positive pole piece and negative pole piece are in no external force restraint state in the folding department of adjacent two-layer diaphragm, along with laminate battery's use, positive pole piece and negative pole piece can take place the bulging deformation, the bulging deformation is especially serious at laminate battery endless life end later stage, make the laminate can appear both sides stick up the limit and warp the circumstances such as deformation, seriously influence laminate battery's life and security, the development of power battery has been restricted.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model aims to provide a laminated body, a soft package battery and a rolling and folding device, and aims to solve the technical problems that in the prior art, two sides of the laminated body in the soft package battery are easy to warp, and the service life and the safety of the soft package battery are seriously influenced.
In order to achieve the purpose, the utility model adopts the technical scheme that: there is provided a roll-up structure comprising:
a plurality of positive electrode pieces;
a plurality of negative electrode plates; and the number of the first and second groups,
the diaphragm is provided with a folding section and a winding section connected with the folding section, the negative pole piece, the diaphragm and the negative pole piece are sequentially overlapped to form a laminated structure, the part of the diaphragm corresponding to the laminated structure forms the folding section, and the winding section is wound on the laminated structure.
The negative pole piece, the folded section of the diaphragm and the positive pole piece are sequentially stacked to form a laminated structure body in a Z-shaped laminated manner, so that the rolling structure has the advantages of a Z-shaped laminating process, has higher safety and is convenient for process control; the winding section is wound on the laminated structure, so that the diaphragm, the positive pole piece and the negative pole piece in the laminated structure are wrapped by the winding section, the folding positions of all layers of diaphragms in the laminated structure are restrained by the winding section, the two sides of the folding sections close to the folding positions of all layers of diaphragms are limited from tilting, the two sides of the positive pole piece and the negative pole piece close to the folding positions of all layers of diaphragms are prevented from expanding and deforming, the shapes of the laminated structure and the soft package battery are guaranteed, and the service life and the safety of the soft package battery are improved.
In one embodiment, the number of the folding sections is multiple, the number of the winding sections is multiple, and one folding section, a plurality of positive pole pieces and a plurality of negative pole pieces which are overlapped in the folding section form a laminated structure; and the plurality of laminated structures are sequentially overlapped along the thickness direction of the positive pole piece and the negative pole piece.
Through adopting above-mentioned technical scheme, can prevent to roll up the protruding deformation in middle part of folding the structure, be favorable to improving the stability of rolling up structure thickness.
In one embodiment, the plurality of winding sections are arranged stacked from the inside to the outside, in the inside to outside direction: the number of lamination structures wrapped by the winding section increases in sequence.
By adopting the technical scheme, the continuous processing of the lamination stack body and the winding section in the rolling structure can be realized.
In one embodiment, the inner winding portion has at least one turn and the exposed end of the membrane has at least two turns.
Through adopting above-mentioned technical scheme, can ensure that each roll up the structure and all be wrapped up by the winding section parcel, and can prevent that terminal winding section pine from taking off.
In one embodiment, the number of fold layers in the folding section is 2-64.
By adopting the technical scheme, the thickness balance of each laminated structure can be ensured.
In one embodiment, the number of folding segments is 2-32 and the number of winding segments is greater than or equal to the number of folding segments.
By adopting the technical scheme, the phenomenon that the winding section occupies the lamination structure body and is overlarge in size can be avoided.
The embodiment of the utility model also provides a soft package battery which comprises the rolling and folding structure in any embodiment.
Through adopting above-mentioned book to fold the structure, be favorable to improving laminate polymer battery's security, ensure laminate polymer battery's appearance quality.
The embodiment of the utility model also provides a rolling and stacking device which comprises a stacking platform for stacking the rolling and stacking structure, a pressing claw mechanism for clamping the rolling and stacking structure, a rotating mechanism for driving the pressing claw mechanism to turn over, a lifting mechanism for driving the rotating mechanism to lift, a diaphragm supply mechanism for supplying a diaphragm and a stacking mechanism for stacking the positive pole piece and the negative pole piece on the diaphragm, wherein the pressing claw mechanism is arranged on the rotating mechanism, and the rotating mechanism is arranged on the lifting mechanism.
By adopting the technical scheme, the lamination structure can be stacked, and the lamination structure can be turned over so as to wind the diaphragm on the lamination structure to form a winding section, thereby realizing the automatic production of the winding structure.
In one embodiment, the rotating mechanism comprises two oppositely arranged rotating seats and a first driving assembly for driving the rotating seats to rotate, the rotating seats are mounted on the first driving assembly, the first driving assembly is connected with the lifting mechanism, and the claw pressing mechanism is connected with the rotating seats.
Through adopting above-mentioned technical scheme, can realize pressing the upset of claw mechanism.
In one embodiment, the pressing claw mechanism comprises four pairs of pressing claw assemblies and second driving assemblies for respectively driving the pressing claw assemblies to move, a pair of pressing claw assemblies are mounted on each second driving assembly in parallel, and two second driving assemblies which are oppositely arranged are mounted on each rotating seat.
Through adopting above-mentioned technical scheme, can grasp the roll-fold structure to roll up the lift of fold structure.
In one embodiment, the winding and stacking device further comprises a translation mechanism for driving the lamination table and the lifting mechanism to translate, and the lifting mechanism and the lamination table are mounted on the translation mechanism.
Through adopting above-mentioned technical scheme, can remove the lamination position, realize "Z" type lamination.
The embodiment of the utility model also provides a processing method of the rolling structure, which comprises the following steps:
s1: providing a plurality of positive pole pieces, a plurality of negative pole pieces and diaphragms, and laminating the diaphragms with the positive pole pieces and the negative pole pieces to form a laminated structure;
s2: turning the lamination stack, and winding a section of diaphragm on the lamination stack to form a winding section wrapping the lamination stack;
s3: and repeating the steps S1 and S2 in sequence until all the lamination structures are completely overlapped and the winding sections wrapping all the lamination structures are completely wound, cutting the diaphragm and fixing the cut ends of the winding sections.
By adopting the technical scheme, the rolling and folding structure in the embodiment can be manufactured.
In one embodiment, in step S2, the lamination stack is rotated by 180 ° n, where n is a positive integer.
By adopting the technical scheme, each laminated structure can be wrapped by the winding section.
In one embodiment, in step S1, the tension of the diaphragm is F1; in step S2, the tension of the diaphragm is F2; the ratio of F2/F1 ranges from 0.5 to 2.0.
Through adopting above-mentioned technical scheme, can prevent that winding section and folding section tension difference from leading to the diaphragm aversion.
In one embodiment, step S2 includes:
s21: clamping and rotating the lamination stack by 180 °, and superposing a layer of membrane on the upper side of the lamination stack;
s22: clamping and rotating the lamination stack and the membrane on the upper side thereof by 180 degrees, and then stacking the membrane on one side on the upper side of the lamination stack again;
s23: and repeating the steps S21 and S22 until the winding of the winding section is completed.
By adopting the technical scheme, the pressing claw is convenient to move outwards when the winding section is wound.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a rolling structure according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a rolling structure according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a rolling and stacking apparatus according to an embodiment of the present invention;
fig. 4 is a flowchart of a method for processing a roll-to-roll structure according to an embodiment of the present invention;
fig. 5 is a flowchart of step S2 in fig. 4.
Wherein, in the figures, the respective reference numerals:
10-a roll-to-roll configuration; 11-positive pole piece; 12-a negative pole piece; 13-a separator; 131-a folding section; 132-a winding section; 14-a lamination stack;
21-a lamination station; 22-a jaw pressing mechanism; 221-a clamping jaw assembly; 222-a second drive assembly; 23-a rotation mechanism; 231-a swivel; 232-a first drive assembly; 24-a lifting mechanism; 25-a membrane supply mechanism; 26-a lamination mechanism; 27-a translation mechanism.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "vertical," "horizontal," "inner," "outer," and the like are used in an orientation or positional relationship indicated based on the orientation or positional relationship shown in the drawings for ease of description and simplicity of description only, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 and fig. 2, a rolling structure 10 according to an embodiment of the present invention will be described. The rolling and folding structure 10 comprises a plurality of positive pole pieces 11, a plurality of negative pole pieces 12 and a diaphragm 13, wherein the diaphragm 13 has a folding section 131 and a winding section 132, and the winding section 132 is connected with the folding section 131. The negative pole piece 12, the diaphragm 13 and the positive pole piece 11 are sequentially stacked to form a lamination structure 14, and a folding section 131 is formed at a part of the diaphragm 13 corresponding to the lamination structure 14, namely, the negative pole piece 12, the folding section 131 and the positive pole piece 11 are arranged in a Z-shaped lamination manner. The winding section 132 is wound on the lamination stack 14. The thickness direction of the rolling structure 10 is the thickness direction of the positive pole piece 11 and the negative pole piece 12.
In the embodiment of the utility model, the negative pole piece 12, the folding section 131 of the diaphragm 13 and the positive pole piece 11 are sequentially stacked to form the lamination structure 14, and the lamination structure 14 is Z-shaped lamination, so that the rolling structure 10 has the advantages of a Z-shaped lamination process, has higher safety and is convenient for process control; the winding section 132 is adopted to wind the lamination structure 14, so that the winding section 132 wraps the lamination structure 14, the folding positions of all layers of diaphragms 13 in the lamination structure 14 are restrained by the winding section 132, the two sides of the folding sections 131 close to the folding positions of all layers of diaphragms 13 are limited to tilt, the two sides of the anode pole piece 11 and the cathode pole piece 12 close to the folding positions of all layers of diaphragms 13 are prevented from expanding and deforming, the shapes of the lamination structure 14 and the soft package battery are guaranteed, and the service life and the safety of the soft package battery are improved. Further, because the winding section 132 wraps the lamination stack 14, the winding section 132 can enable each layer of the diaphragm 13 inside the lamination stack 14 to be tightly attached to the positive pole piece 11 and the negative pole piece 12, prevent the diaphragm 13, the positive pole piece 11 or the negative pole piece 12 in the lamination stack 14 from shifting, ensure the safety of the soft package battery, eliminate the gluing on the diaphragm, and facilitate the cost reduction.
In one embodiment of the present invention, referring to fig. 1 and 2, in the diaphragm 13: the number of the folding sections 131 is multiple, the number of the winding sections 132 is multiple, and one folding section 131, the multiple positive pole pieces 11 and the multiple negative pole pieces 12 which are overlapped in the folding section 131 form one lamination structure 14; the plurality of lamination structures 14 are stacked in order in the thickness direction of the positive electrode tab 11 and the negative electrode tab 12. That is, the number of the lamination stack 14 is plural, the number of the winding sections 132 is plural, each lamination stack 14 includes one folding section 131, a plurality of positive electrode tabs 11, and a plurality of negative electrode tabs 12, and in each lamination stack 14: the plurality of positive electrode tabs 11 and the plurality of negative electrode tabs 12 are stacked in the folded section 131. Thus, the continuous processing of the plurality of folding sections 131 and the plurality of winding sections 132 can be realized through the single membrane 13, which is convenient for realizing the continuous production of the rolling and folding structure 10 and is beneficial to improving the processing efficiency of the rolling and folding structure 10. Moreover, by sequentially stacking a plurality of lamination stacks 14, the thickness of the rolled structure 10 can be changed by changing the number of lamination stacks 14, or the thickness of the rolled structure 10 can be changed by changing the number of layers of the folded membrane 13 in each lamination stack 14, so that the thickness of the rolled structure 10 can be conveniently controlled. Further, when the number of the lamination stack 14 is increased, the number of layers of the diaphragm 13 in the lamination stack 14 can be reduced, so that the number of layers of the diaphragm 13 constrained by each winding section 132 is reduced, the tension force applied to each winding section 132 can be controlled, the stress of each layer of the diaphragm 13 in the folding section 131 is balanced, the phenomenon that the edge of the lamination stack 14 is too tight and the middle part of the lamination stack 14 is protruded and deformed due to the fact that the tension force of the winding section 132 is too large is avoided, the constraint failure of each layer of the diaphragm 13, the positive pole piece 11 and the negative pole piece 12 in the lamination stack 14 due to the fact that the winding section 132 is stretched can be prevented, it is guaranteed that two sides of the winding stack 10 are compressed, the thickness stability of the winding stack 10 is improved, the assembly of the soft package battery is facilitated, and the stability of the soft package battery is improved.
In another embodiment of the present invention, the number of the diaphragms 13 is plural, and on each of the diaphragms 13: a folded section 131, and the plurality of positive electrode tabs 11 and the plurality of negative electrode tabs 12 stacked therein form a lamination structure 14; the wound portion 132 of at least one separator 13 is wrapped around the outer side of the lamination structure 14 of each separator 13. This enables each folded portion of the lamination stack 14 to be subjected to the restraining force of the corresponding winding section 132, reducing the variation in thickness of each folded section 131 on both sides of the folded portion of each layer of the membrane 13. At least one winding section 132 wraps the lamination stack 14 on all the membranes 13 to enable the lamination stack 14 on two adjacent membranes 13 to be tightly attached to each other. Further, by using a plurality of diaphragms 13, the number of the folding sections 131 and the winding sections 132 on a single diaphragm 13 can be reduced, the number of layers of the winding sections 132 wrapped outside a single lamination structure 14 is reduced, the thickness and the width of the winding sections 132 occupying the thickness of the rolling structure 10 can be reduced, and the difference of the widths of the rolling structure 10 in the thickness direction of the rolling structure 10 can be reduced.
In an embodiment of the present invention, referring to fig. 1 and fig. 2, the plurality of winding segments 132 are stacked from inside to outside, and in a direction from inside to outside of the plurality of winding segments 132: the number of lamination stacks 14 wrapped by the winding section 132 increases in sequence. That is, the head end of the separator 13 is the end located inside the winding structure 10, the tail end of the separator 13 is the end located outside the winding structure 10, and from the head end of the separator 13 to the tail end of the separator 13: the lamination stacks 14 corresponding to the respective folding sections 131 are sequentially stacked, and the respective winding sections 132 are wound around all the lamination stacks 14 of which the winding sections 132 are adjacent to the head end of the separator 13. Thus, after the lamination of each lamination stack 14 is completed, the diaphragm 13 can be wound on the lamination stack 14 by turning the lamination stack 14 over; after the lamination stack 14 is turned over, the lamination may be continued to form the next lamination stack 14, so that the continuous processing of the roll-up structure 10 can be realized through the "Z" type lamination and turning step, which is advantageous for improving the processing efficiency of the roll-up structure 10. Further, the post-wound winding section 132 can wrap the plurality of lamination stacks 14 stacked previously such that the layers of the post-stacked lamination stack 14 are adhered closely together and such that the post-stacked lamination stack 14 is adhered closely to the pre-stacked lamination stack 14.
Alternatively, each winding section 132 may be disposed in a clockwise winding arrangement or a counterclockwise winding arrangement around the lamination stack 14 at the head end of the membrane 13, so that after one lamination stack 14 is completed, the winding direction may be selected according to the position of the membrane 13 on the top layer of the lamination stack 14, so that the position where the winding section 132 is connected to the folding section 131 is folded at substantially 90 °.
Further, from the head end of the diaphragm 13 to the tail end of the diaphragm 13: the lengths of the plurality of winding sections 132 increase in sequence. That is, the length of the winding section 132 located outside the rolling structure 10 is greater than the length of the winding section 132 located inside the rolling structure 10. Since as the number of the lamination stacks 14 increases, the length of the corresponding winding sections 132 increases, so as to ensure that each lamination stack 14 can be wrapped by the corresponding winding section 132.
In one embodiment of the present invention, referring to fig. 1-2, the winding section 132 of each folding section 131 located inside the rolling structure 10 has at least one turn, and the winding section 132 located at the exposed end of the membrane 13 has at least two turns. That is, the winding section 132 located at the end of the separator 13 is wound at least two times around the corresponding lamination stack 14, and the remaining winding sections 132 are wound at least one time around the corresponding lamination stack 14. Therefore, each folding part of the diaphragm 13 in each lamination stack 14 can be wrapped by the winding section 132, and the thickness stability of the lamination stack 14 is guaranteed; the winding section 132 at the end of the membrane 13 adopts a plurality of turns, and after the exposed end of the winding section 132 is fixed, all the lamination stacks 14 can be wrapped, the end of the membrane 13 is prevented from loosening, and the adhesion among a plurality of lamination stacks 14 is ensured.
In an embodiment of the present invention, referring to fig. 1 to 2, the number of the folding layers of the folding section 131 is 2 to 64, which can ensure that the stress of each layer of the diaphragm 13, the positive electrode plate 11 and the negative electrode plate 12 in the lamination stack 14 is balanced, and can control the length of the winding section 132, reduce the stretching length of the winding section 132 after being stressed, and avoid the constraint failure of the winding section 132 to each folding portion in the corresponding folding section 131 due to the excessive stretching of the winding section 132 after being stressed. Alternatively, the number of the folding layers of the folding section 131 may be 4, 8, 16, 32, 48, 56, or the like, which is beneficial to reduce the number of the lamination stacks 14 in the rolling structure 10, reduce the number of the folding sections 131 and the winding sections 132, and facilitate control of the alignment of the lamination stacks 14 when the number of the folding layers of the folding section 131 is increased; and this allows control of the length and number of layers of the wound section 132 to avoid wrinkling of the wound section 132 due to inconsistent tension in the multiple wound sections 132.
In an embodiment of the present invention, referring to fig. 1 and fig. 2, the number of the winding segments 132 is 2-32, so that the number of the winding segments 132 can be controlled, the thickness and the width of the winding segment 132 occupying the folded structure 10 can be controlled, and the energy density of the folded structure 10 can be ensured. Alternatively, the number of winding segments 132 may be 4, 6, 9, 14, or the like. The width direction of the folding structure 10 is perpendicular to the folding edge of the folding section 131 and the thickness direction of the folding structure 10.
Referring to fig. 1 and fig. 2, the present application further provides a pouch battery, where the pouch battery includes the rolling structure 10 in any of the above embodiments, and by using the rolling structure 10, the folding positions of the diaphragms 13 in each layer in the lamination structure 14 are constrained by the winding section 132, so as to limit the two sides of the folding section 131 close to the folding position of the diaphragms 13 in each layer from tilting, avoid the two sides of the positive electrode plate 11 and the negative electrode plate 12 close to the folding position of the diaphragms 13 in each layer from expanding and deforming, ensure the shapes of the lamination structure 14 and the pouch battery, and improve the service life and the safety of the pouch battery.
Referring to fig. 1 to 3, an embodiment of the present invention further provides a rolling and stacking apparatus, where the rolling and stacking apparatus is used for manufacturing the rolling and stacking structure 10 in any of the above embodiments, the rolling and stacking apparatus includes a stacking table 21, a pressing claw mechanism 22, a rotating mechanism 23, a lifting mechanism 24, a diaphragm supply mechanism 25 and a stacking mechanism 26, the diaphragm supply mechanism 25 is used for supplying the diaphragm 13 and transferring the diaphragm 13 to the stacking table 21, the stacking mechanism 26 is used for stacking the positive electrode sheet 11 and the negative electrode sheet 12 on the diaphragm 13 on the stacking table 21, the stacking table 21 is used for stacking the diaphragm 13, the positive electrode sheet 11 and the negative electrode sheet 12 into the rolling and stacking structure 10, the pressing claw mechanism 22 is used for clamping the rolling and stacking structure 10, the rotating mechanism 23 is used for driving the pressing claw mechanism 22 to turn, and the lifting mechanism 24 is used for driving the rotating mechanism 23 to lift.
In the embodiment of the utility model, the diaphragm 13 can be automatically conveyed to the lamination table 21 by adopting the diaphragm supply mechanism 25, and the lamination mechanism 26 can alternately superpose the positive pole piece 11 and the negative pole piece 12 on the diaphragm 13, so that the lamination of the rolling and stacking structure 10 can be carried out on the lamination table 21, and the lamination structure 14 is formed by stacking; after the lamination of one lamination structure 14 is completed, the pressing claw mechanism 22 clamps the lamination structure 14, the lifting mechanism 24 drives the rotating mechanism 23 to ascend, and the pressing claw mechanism 22 and the lamination structure 14 ascend along with the rotating mechanism 23 so that the lamination structure 14 is separated from the lamination table 21; then, the rotating mechanism 23 drives the pressing claw mechanism 22 to turn over, the pressing claw mechanism 22 drives the lamination stack 14 to turn over, and the diaphragm 13 is wound on the lamination stack 14 to form a winding section 132 wrapping the lamination stack 14; then, the lifting mechanism 24 drives the pressing claw mechanism 22 to descend, so that the lamination can be repeatedly performed on the diaphragm 13 when the lamination stack 14 descends to the lamination table 21 again, and after the lamination stack 14 is completely stacked, the lamination stack 14 is turned over again to form a next winding section 132; the above steps are repeated to complete the fabrication of the roll-to-roll structure 10.
Wherein, the lamination mechanism 26 may be a pole piece lamination mechanism in an existing "Z" type rolling and stacking device, and the diaphragm supply mechanism 25 may be a diaphragm supply mechanism in an existing "Z" type rolling and stacking device, which will not be described herein.
Alternatively, the number of the lamination mechanisms 26 may be two, wherein one set of the lamination mechanisms 26 is used for laminating the positive pole piece 11, and the other set of the lamination mechanisms 26 is used for laminating the negative pole piece 12, which is beneficial to improving the lamination efficiency.
In an embodiment of the present invention, the lifting mechanism 24 may include a first slide, a first guide rail, a first lead screw, a first nut, and a first motor, the first guide rail and the first lead screw are vertically disposed, the rotating mechanism 23 is connected to the first slide, the first slide is slidably connected to the first guide rail, the first slide is connected to the first nut, the first nut is connected to the first lead screw, the first motor is configured to drive the first lead screw to rotate, and the first motor is connected to the first lead screw. When the first motor rotates, the first motor drives the first lead screw to rotate, the first nut moves along the length direction of the first lead screw, the first nut drives the first sliding seat to slide on the first guide rail, and the rotating mechanism 23 moves along with the first sliding seat, so that the rolling and stacking structure 10 is driven to ascend to leave the laminating table 21 or descend to the laminating table 21. In another embodiment of the present invention, the lifting mechanism may also include a first gear, a first rack, and a first motor, the first rack is vertically disposed, the first rack is connected to the rotating mechanism, the first gear is engaged with the first rack, and the first gear is mounted on the first motor, so that the height of the rotating mechanism is adjusted by engaging and driving the first gear and the first rack.
In an embodiment of the present invention, referring to fig. 3, the rotating mechanism 23 includes two rotating bases 231 and two first driving assemblies 232, the two rotating bases 231 are disposed opposite to each other, the pressing claw mechanism 22 is connected to the rotating bases 231, the rotating bases 231 are mounted on the first driving assemblies 232, the first driving assemblies 232 are used for driving the rotating bases 231 to rotate, and the first driving assemblies 232 are connected to the lifting mechanism 24. Therefore, the first driving assembly 232 can drive the rotating base 231 to rotate so as to drive the claw pressing mechanism 22 to turn over. Alternatively, the number of the first driving assemblies 232 is two, two sets of the first driving assemblies 232 are respectively connected to the two rotating bases 231, and the first driving assemblies 232 may be configured to drive the rotating bases 231 to rotate by using a motor. In other embodiments of the present invention, the rotating mechanism may also be a cylinder driving the rotating base to rotate.
In an embodiment of the present invention, referring to fig. 3, the claw pressing mechanism 22 includes four pairs of claw pressing assemblies 221 and four second driving assemblies 222, each second driving assembly 222 is configured to drive one pair of claw pressing assemblies 221 to move synchronously, each second driving assembly 222 is provided with one pair of claw pressing assemblies 221, two claw pressing assemblies 221 on each second driving assembly 222 are arranged in parallel, each rotating base 231 is provided with one pair of second driving assemblies 222, and two second driving assemblies 222 on each rotating base 231 are arranged oppositely. The second driving assembly 222 drives the pressing claw assembly 221 to move, and the pressing claw assembly 221 can move to the surface layer of the rolling structure 10 and clamp the rolling structure 10 when each layer of the diaphragm 13, the positive pole piece 11 or the negative pole piece 12 is stacked. That is, the number of the pressing claw assemblies 221 may be eight, the number of the second driving assemblies 222 may be four, the eight pressing claw assemblies 221 are divided into four groups, the four groups of the pressing claw assemblies 221 are in a rectangular array, and the four groups of the pressing claw assemblies 221 are used for respectively clamping four corners of the rolling structure 10. This ensures that, when the lamination stack 14 is inverted, the pressing claw assembly 221 which is inverted to the upper side of the lamination stack 14 can move to the upper side of the diaphragm 13 when the diaphragm 13 is folded and clamp the diaphragm 13. The second driving assembly 222 is a linear driving assembly, so that the pressing claw assembly 221 can be controlled to move linearly. Of course, the number of the second driving assemblies 222 may also be eight, and each second driving assembly 222 is provided with one pressing claw fixing piece. The pressing claw assembly 221 may include a pressing claw, a first linear driver and a second linear driver, wherein the first linear driver is used for driving the pressing claw to ascend and descend, and the second linear driver is used for driving the first linear driver to translate. The control principle of the pressing claw assembly 221 and the second driving assembly 222 belongs to the known technology in the art, and is not described herein.
In one embodiment of the present invention, the winding and stacking device further comprises a translation mechanism 27, the translation mechanism 27 is used for driving the lifting mechanism 24 and the stacking table 21 to translate, and the lifting mechanism 24 and the stacking table 21 are connected with the translation mechanism 27. Therefore, the lamination position can be adjusted through the translation mechanism 27, and when the translation mechanism 27 drives the lamination table 21 and the lifting mechanism 24 to reciprocate, the negative electrode plate 12, the diaphragm 13 and the positive electrode plate 11 can be stacked on the lamination table 21 layer by layer, so that the diaphragm 13 is folded in a Z shape, and the lamination structure 14 of the Z-shaped lamination is formed. Of course, in other embodiments of the present invention, the "Z" folding of the diaphragm 13 may also be achieved by controlling the reciprocating movement of the end of the diaphragm 13 over the lamination station 21 by the diaphragm feed mechanism 25.
In one embodiment of the present invention, the translation mechanism 27 includes a second slide, a second guide rail, a second lead screw, a second nut, and a second motor, the lamination stage 21 and the lifting mechanism 24 are connected to the second slide, the second slide is slidably supported on the second guide rail, the second slide is connected to the second nut, the second nut is connected to the second lead screw, the second motor is used for driving the second lead screw to rotate, and the second motor is connected to the second lead screw. When the second motor rotates, the second nut moves along the length direction of the second screw rod, the second nut drives the second sliding seat to slide on the second guide rail, and the lamination table 21 and the lifting mechanism 24 move along with the second sliding seat; when the second motor rotates forwards and backwards periodically, the second sliding seat drives the lamination table 21 and the lifting mechanism 24 to move back and forth along the second guide rail, so that the diaphragm 13 can be folded in a Z shape on the lamination table 21. In another embodiment of the present invention, the translation mechanism may also include a second gear, a second rack, and a second motor, the second rack is horizontally disposed, the second rack is connected to the lamination table and the lifting mechanism, the second gear is engaged with the second rack, and the second gear is mounted on the second motor, so that the second gear and the second rack are engaged for transmission, thereby realizing the reciprocating movement of the lamination table.
Referring to fig. 1, fig. 3 and fig. 4, an embodiment of the present invention further provides a method for processing a rolling structure, where the method for processing a rolling structure includes the following steps:
s1: providing a plurality of positive pole pieces 11, a plurality of negative pole pieces 12 and a diaphragm 13, and laminating the diaphragm 13 with the positive pole pieces 11 and the negative pole pieces 12 to form a laminated structure 14;
s2: turning over the lamination stack 14, winding a length of the membrane 13 on the lamination stack 14, forming a wound length 132 wrapping the lamination stack 14;
s3: the steps S1 and S2 are sequentially repeated until all the lamination stacks 14 are completely stacked and the winding of the winding sections 132 wrapping all the lamination stacks 14 is completed, the separator 13 is cut off, and the cut ends of the winding sections 132 are fixed.
In the utility model, the diaphragm 13 is firstly folded, so that the diaphragm 13 is folded into a Z shape to form a folding section 131; alternately stacking the negative pole piece 12 and the positive pole piece 11 on each layer of the diaphragm 13 of the folding section 131 in the folding process of the diaphragm 13 to form a laminated structure 14 with a Z-shaped laminated structure; then, the lamination stack 14 is turned over, and a length of the diaphragm 13 is wound on the lamination stack 14 to form a wound section 132, so that the wound section 132 wraps the lamination stack 14; then, the lamination is continued, a next lamination stack 14 is stacked, after the stacking of the next lamination stack 14 is completed, the membrane 13 is wound on the stacked lamination stack 14 to form a next winding section 132, so that the next winding section 132 wraps the stacked lamination stack 14, the lamination stack 14 is repeated, the winding section 132 is repeated, after the winding section 132 at the tail end of the membrane 13 is completed, the exposed end of the winding section 132 at the outermost side of the winding structure 10 is cut off, and then the cut end of the winding section 132 is fixed, so that the winding structure 10 is formed.
In this embodiment, the rolling structure 10 is divided into a plurality of lamination structures 14, and the lamination structures 14 are stacked for a plurality of times, and after one lamination structure 14 is stacked for each time, the lamination structure 14 is wound and wrapped by the diaphragm 13, so that the folded part of the lamination structure 14 is bound by the winding section 132, the two sides of the folded section 131 close to the folded part of each layer of diaphragm 13 are limited from tilting, the two sides of the folded parts of the positive electrode plate 11 and the negative electrode plate 12 close to each layer of diaphragm 13 are prevented from swelling and deforming, the shapes of the lamination structure 14 and the soft package battery are ensured, and the service life and the safety of the soft package battery are improved. Therefore, the processing of the rolling and stacking structure 10 can be realized through the two processes of the lamination and the winding, because the lamination process is consistent with the existing Z-shaped lamination process, the existing Z-shaped rolling and stacking device and process can be utilized for improvement, only the step of overturning the lamination structure 14 needs to be added in the existing Z-shaped lamination process, and the structure for realizing the overturning of the lamination structure 14 is added in the existing Z-shaped rolling and stacking device, so that the rolling and stacking structure 10 in the embodiment can be processed after the existing Z-shaped rolling and stacking device is improved, and the equipment investment and the production cost are favorably reduced.
In one embodiment of the present invention, in step S2, lamination stack 14 is flipped by an angle of 180 ° n, where n is a positive integer. Thus, the winding section 132 between two adjacent folding sections 131 can wrap the side edge of the previously stacked lamination stack 14, and when n is 1, the winding section 132 between two adjacent folding sections 131 can wrap one side of the lamination stack 14, and the winding section 132 can wrap the other side of two lamination stacks 14, and finally both sides of each lamination stack 14 can be wrapped. Alternatively, n is greater than or equal to 2, which enables the wound section 132 formed by each winding to wrap the previously laminated lamination stack 14.
Optionally, n is a positive even number. This allows lamination of lamination stack 14 starting from one end of diaphragm 13, allowing a plurality of lamination stacks 14 to be stacked in sequence, facilitating alignment when lamination stacks 14 are laminated.
In one embodiment of the present invention, in step S1, the tension of the diaphragm 13 is F1; in step S2, the tension of the diaphragm 13 is F2; F2/F1 ranged from 0.5-2.0. That is, the tension of the diaphragm 13 when the lamination stack 14 is laminated in step S1 is F1, the tension of the diaphragm 13 when the lamination stack 14 is inverted in step S2 is F2, and the range of F2/F1 is 0.5 to 2.0. Therefore, the tension of the diaphragm 13 in the lamination structure 14 is basically consistent with that of the diaphragm 13 in the winding section 132, the diaphragm 13 is prevented from being displaced due to tension difference, the positive pole piece 11 and the negative pole piece 12 are prevented from being dislocated, and the safety of the winding structure 10 is guaranteed. Alternatively, F2/F1 may be 0.8, 1.0, 1.2, 1.5, 1.8, or the like.
In an embodiment of the present invention, referring to fig. 4 and 5, step S2 includes:
s21: the lamination stack 14 is clamped and rotated by 180 ° and then the membrane 13 is superimposed on the surface of the upper side of the lamination stack 14;
s22: the lamination stack 14 and the membrane 13 of its surface are clamped and rotated by 180 °, and then the membrane 13 is again superimposed on the surface of the upper side of the lamination stack 14;
s23: and repeating the steps S21 and S22 until the winding of the winding section 132 is completed.
When the lamination stack 14 is turned over to wind the membrane 13, the lamination stack 14 is rotated by 180 ° each time, and then the membrane 13 is stacked on the surface of the lamination stack 14 and compressed. Therefore, when one layer of diaphragm 13 is stacked each time, the pressing claws can move outwards, the pressing claws are always clamped on the diaphragm 13 on the outer side in the winding process, the winding of the winding section 132 is prevented from being interfered by the pressing claws, and the tension balance of each layer of the winding section 132 is guaranteed. Moreover, in this way, when the winding structure 10 is manufactured, each outward movement of the pressing claw during the winding of the winding section 132 can be consistent with each outward movement of the pressing claw during the lamination of the lamination stack 14.
In the present embodiment, in step S1, the upper layer of the control lamination stack 14 is the negative electrode tab 12. Thus, after one rotation of the lamination stack 14, the diaphragm 13 is stacked on the lamination stack 14 and can be stacked on the negative electrode plate 12, so that two continuous layers of diaphragms 13 between two adjacent lamination stacks 14 are avoided, which is beneficial to improving the energy density of the rolling structure 10. Of course, the upper side of the lamination structure 14 may be the separator 13, or the positive electrode tab 11 or the negative electrode tab 12 may be stacked on the separator 13 every time the lamination structure is turned 180 °.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
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| CN115295866A (en) * | 2022-09-14 | 2022-11-04 | 星恒电源(滁州)有限公司 | Lithium ion battery core and lamination method thereof |
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