CN112490488B - Battery cell manufacturing equipment and method thereof - Google Patents
Battery cell manufacturing equipment and method thereof Download PDFInfo
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- CN112490488B CN112490488B CN202110156994.6A CN202110156994A CN112490488B CN 112490488 B CN112490488 B CN 112490488B CN 202110156994 A CN202110156994 A CN 202110156994A CN 112490488 B CN112490488 B CN 112490488B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
The application relates to a battery cell manufacturing device and a method thereof. The electric core comprises a pole piece and a diaphragm, and the electric core manufacturing equipment comprises: a winding needle configured to wind the pole piece and the separator; a compounding device located upstream of the winding needle, the compounding device configured to wet at least one of the mutually adjacent pole pieces and membranes to connect the mutually adjacent pole pieces and membranes entering the winding needle. The application provides a battery core manufacturing equipment, aims at solving the problem that lithium is separated out in the battery core.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery core manufacturing device and a method thereof.
Background
In the production process of the power battery, a winding device is needed to wind the pole piece and the diaphragm into a battery core. The electric core after coiling and prepressing shaping is in a flat structure. However, in the use process of the battery cell after winding and pre-pressing for shaping, the lithium precipitation condition exists, which affects the use safety of the battery cell.
Disclosure of Invention
The application provides a battery cell manufacturing device and a method thereof, aiming at solving the problem of lithium precipitation of a battery cell.
On the one hand, this application provides a battery cell manufacturing equipment, and battery cell includes pole piece and diaphragm, and battery cell manufacturing equipment includes:
a winding needle configured to wind the pole piece and the separator; a compounding device located upstream of the winding needle, the compounding device configured to wet at least one of the adjacent pole pieces and the membrane to connect the adjacent pole pieces and the membrane entering the winding needle.
According to the battery core manufacturing equipment provided by the embodiment of the application, the pole piece and the diaphragm are wound by the winding needle to form the battery core. Before the pole pieces and the diaphragms enter the winding needle, at least one of the pole pieces and the diaphragms is wetted by using a composite device, so that the adjacent pole pieces and the diaphragms entering the winding needle are in composite connection, and the diaphragms in the battery cells are not in a free state any more but are restrained. After the battery core after being wound is stretched to the flat shape, the diaphragm is restrained, so that tensile stress is not easy to accumulate in the diaphragm, retraction is not easy to occur, and collapse is not easy to occur, and therefore the possibility that the gaps between the adjacent pole pieces are too large due to the fact that the pole pieces are driven to move inwards by retraction of the diaphragm is reduced, and the possibility of lithium precipitation is further reduced. Because the pole piece and the diaphragm are connected in a wetting mode, the pole piece and the diaphragm are not rigidly connected, so that the pole piece and the diaphragm can relatively move in a staggered mode, but are not easy to separate from each other, and the diaphragm is not easy to wrinkle in the process of taking down the battery cell from the winding needle and flattening the battery cell.
According to one embodiment of the present application, a compound device is configured to: the compound device wets at least one of the pole pieces and the separator of an adjacent first turn during winding of the pole pieces by the winding needle into the first turn.
After the battery cell which finishes winding is flattened, the diaphragm corresponding to the pole piece of the first winding is easier to retract, deform or collapse relative to the diaphragm close to the outside, so that the diaphragm and the pole piece of the initial winding can be compositely connected, the wetting duration can be shortened, the wetting area can be reduced under the condition that the pole piece and the diaphragm are not easy to separate, and the influence of the wetting process on the whole winding work efficiency and the cost of the wetting process can be reduced.
According to an embodiment of the present application, the winding needle includes a blanking abdicating groove, the compounding device is configured to: and wetting at least one part of the pole piece and the diaphragm corresponding to the opening of the blanking abdicating groove.
After electric core is flattened, pole piece and diaphragm that unloading abdication groove's opening corresponds are partly located the bending zone of electric core to effectively reduce electric core and take place to retract and lead to the too big possibility in clearance between the adjacent pole piece in bending zone at the diaphragm in bending zone, and then reduce the possibility that lithium is appeared in bending zone.
According to one embodiment of the application, the winding needle comprises a winding area, the compounding device comprises a liquid release device configured to: releasing liquid on at least one of the adjacent pole pieces and the membrane to form a wetted area, and an axial dimension of the wetted area in the axial direction of the winding needle is smaller than an axial dimension of the winding area.
The pole piece and the diaphragm have two opposite edges in the axial direction of the winding needle. When the wetting area is formed on the pole piece or the diaphragm, the wetting area is positioned between the two edges, and the non-wetting area is formed between the wetting area and the two edges. Because the liquid has certain fluidity, the pole piece and the diaphragm can squeeze the liquid after entering the winding needle, and the liquid between the wound pole piece and the diaphragm can overflow out of the wetting area. The liquid overflowing out of the wetting area can flow to the non-wetting area formed between the wetting area and the two edges, so that the liquid is not easy to overflow from the two edges, the possibility that the electric core and the winding needle are adhered to each other to cause the winding needle to be badly pulled out due to the fact that the liquid overflows to the winding needle is reduced, and the possibility that the structural part is corroded and damaged due to the fact that the liquid overflows or splashes to other structural parts after overflowing is also reduced.
According to an embodiment of the application, the liquid release device is configured to release the liquid in the form of droplets.
The liquid released onto the pole piece or membrane forms droplets. When an image recognition device is used to detect whether the diaphragm and the pole piece are aligned with each other in the axial direction of the winding needle, a good detection visual field is required. When the liquid released by the liquid releasing device is in a liquid drop shape, the liquid drop is not easy to shield the detection visual field of the image recognition device, and the normal work of the image recognition device is favorably ensured.
According to an embodiment of the application, the compounding device comprises an on-off valve configured to open or close the liquid release device according to a winding angle of the winding needle.
The position and the area of a wetting area formed on the pole piece or the diaphragm by the liquid release device can be precisely controlled by controlling the liquid release device through the switch valve.
According to one embodiment of the application, the number of the liquid releasing devices is more than three, and the more than three liquid releasing devices are arranged at intervals, so that at least one liquid releasing device is correspondingly arranged on the adjacent pole piece and the diaphragm.
The composite device can simultaneously wet at least one of the adjacent pole pieces and the diaphragm, and the wetting work efficiency is effectively improved.
According to an embodiment of the application, the battery cell manufacturing equipment further comprises a flow detection module, a flow regulation module and a controller, wherein the flow detection module is configured to collect a flow signal of the liquid released by the liquid releasing device, and the controller controls the flow regulation module according to the liquid flow signal to regulate the flow of the liquid released by the liquid releasing device.
The controller controls the flow regulating module according to the liquid flow signal to regulate the flow of the liquid released by the liquid releasing device, so that the liquid releasing amount of the liquid releasing device can be accurately controlled, and the phenomenon that the needle is badly pulled due to the adhesion of the winding needle and the inner membrane caused by the release of excessive liquid is prevented.
According to an embodiment of the present application, the battery cell manufacturing apparatus further includes a translation device, the composite device is connected to the translation device, and the translation device is configured to drive the composite device to move horizontally and/or vertically.
The translation device is configured to drive the composite device to move horizontally and/or vertically, so that the composite device can be moved to the optimal working position to perform the wetting work, the composite device can be ensured to wet the preset area of the pole piece or the diaphragm more accurately, and the composite device can be retracted to the initial position after the wetting work is completed, and the possibility of generating adverse effects on the winding process is reduced.
According to an embodiment of the present application, the cell manufacturing apparatus further comprises a dancer roll, the dancer roll is located upstream of the compounding device, and the dancer roll is configured to adjust the tension of the pole piece and/or the membrane.
The tension adjusting roller can keep the pole piece and the diaphragm in a tensioned state, and the possibility that the pole piece or the diaphragm enters a winding needle in a loose state to cause the pole piece or the diaphragm to wrinkle is reduced. Meanwhile, the tension adjusting roller is arranged at the upstream of the composite device so as to prevent the composite device from corroding the tension adjusting roller when wetting the pole piece and/or the diaphragm and further prevent short circuit in the battery cell caused by metal chips falling off from the tension adjusting roller.
According to an embodiment of the application, the outer surface of the winding needle is provided with a groove, the groove extends along the axial direction of the winding needle, and more than two grooves are arranged at intervals along the circumferential direction of the winding needle.
The recess more than two sets up along the circumference interval of rolling up the needle to electric core and the area of contact between rolling up the needle diminish, even when the liquid flow of set composite release to rolling up the needle, also can reduce the degree of difficulty that electric core pulled out from rolling up the needle, reduce to roll up the needle and appear pulling out the bad possibility of needle.
According to an embodiment of the application, the cell manufacturing equipment further comprises a purging device, and the purging device is configured to purge the winding needle to clean the winding needle.
On one hand, the winding needle is ensured to have good cleanliness, residual liquid on the winding needle is reduced, and the possibility of poor needle pulling of the winding needle caused by adhesion of the battery cell and the winding needle is reduced; on the other hand, when the liquid has volatility, the purging device can accelerate the removal of the liquid, and is favorable for improving the winding work efficiency.
According to an embodiment of the application, the battery cell manufacturing equipment further comprises an angle adjusting device, the purging device is arranged on the angle adjusting device, and the angle adjusting device is configured to adjust a purging angle of the purging device.
The angle adjusting device is configured to adjust the purging angle of the purging device, so that the purging device can purge each area of the winding needle at an optimal angle, and the uniformity of purging effect and the purging work efficiency are guaranteed.
According to an embodiment of the present application, the cell manufacturing apparatus further includes a gas flow regulating valve configured to regulate a flow of gas ejected from the purge device.
Can accurate control through gas flow control valve sweep that the device sweeps for long, guarantee no matter remain more or less liquid on rolling up the needle, sweep the device and can accomplish in the scheduled time and roll up needle cleaning work.
In another aspect, a method for manufacturing a battery cell is provided according to the present application, which includes:
wetting at least one of adjacent pole pieces and separator membranes;
winding the pole pieces and the membranes, wherein adjacent pole pieces and membranes are connected.
According to the cell manufacturing method provided by the embodiment of the application, before the pole pieces and the diaphragm start to be wound, at least one of the pole pieces and the diaphragm is wetted, so that the wound adjacent pole pieces and the wound diaphragm are in composite connection, and the diaphragm in the cell is not in a free state any more but is restrained. After the battery core after being wound is stretched to the flat shape, the diaphragm is restrained, so that tensile stress is not easy to accumulate in the diaphragm, retraction is not easy to occur, and collapse is not easy to occur, and therefore the possibility that the gaps between the adjacent pole pieces are too large due to the fact that the pole pieces are driven to move inwards by retraction of the diaphragm is reduced, and the possibility of lithium precipitation is further reduced. Because the pole piece and the diaphragm are connected in a wetting mode, the pole piece and the diaphragm are not fixedly connected, so that the pole piece and the diaphragm can still relatively move but are not easily separated from each other, and the diaphragm is not easily wrinkled in the process of transferring the battery cell and flattening the battery cell.
According to one embodiment of the application, during winding of a pole piece into a first turn, at least one of the pole piece and the separator of an adjacent first turn is wetted.
Because the diaphragm corresponding to the first circle of wound pole pieces is easy to retract, deform or collapse after the wound battery cell is flattened, the first circle of wound pole pieces and the diaphragm corresponding to the first circle of wound pole pieces can be compositely connected, so that the wetting duration can be shortened, the wetting area can be reduced under the condition that the pole pieces and the diaphragm are not easy to separate, and the influence of the wetting process on the whole winding work efficiency and the cost of the wetting process can be reduced.
According to one embodiment of the application, the pole piece and the diaphragm are wound by using a winding needle, the winding needle comprises a blanking abdicating groove, and at least one part of the pole piece and the diaphragm corresponding to the opening of the blanking abdicating groove is wetted.
After electric core is flattened, pole piece and diaphragm that unloading abdication groove's opening corresponds are partly located the bending zone of electric core to effectively reduce electric core and take place to retract and lead to the too big possibility in clearance between the adjacent pole piece in bending zone at the diaphragm in bending zone, and then reduce the possibility that lithium is appeared in bending zone.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present application will be described below by referring to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a cell manufacturing apparatus according to an embodiment of the present application;
FIG. 2 is a schematic structural view of a winding needle according to an embodiment of the present application;
FIG. 3 is a schematic view of the winding needle after winding the pole piece and the separator according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a blanking assembly clamping battery cell according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a tensile cell of a blanking assembly according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a blanking assembly clamping cell according to another embodiment of the present application;
FIG. 7 is a schematic diagram of a compounding device and a winding pin in accordance with an embodiment of the present application;
FIG. 8 is a schematic structural view of a compounding device and a winding pin in accordance with another embodiment of the present application;
FIG. 9 is a schematic view of a composite device and translation device assembly configuration according to an embodiment of the present application;
FIG. 10 is a schematic view of the connection of the fluid release device, the flow sensing module, the flow regulating module and the controller according to an embodiment of the present application;
FIG. 11 is a schematic view of a compounding device and a winding pin in accordance with yet another embodiment of the present application;
FIG. 12 is a schematic view of an angle adjustment device and purge device assembly according to an embodiment of the present application;
fig. 13 is a schematic flow chart of a cell manufacturing method according to an embodiment of the present application.
In the drawings, the drawings are not necessarily drawn to scale.
Description of the labeling:
1. cell manufacturing equipment; 2. a first unwinding device; 3. a second unwinding device; 4. a dancer roll; 5. an image recognition device; 6. coiling a needle; 6a, a winding area; 6b, blanking yielding grooves; 6c, a groove; 61. a first half shaft; 62. a second half shaft; 7. pole pieces; 8. a diaphragm; 9. an electric core; 9a, a bending area; 10. a blanking assembly; 101. clamping the needle at the inner side; 102. clamping the needle at the outer side; 20. a compounding device; 21. a liquid release device; 22. an on-off valve; 30. a flow detection module; 40. a flow regulation module; 50. a controller; 60. a translation device; 70. a purging device; 80. an angle adjusting device; 90. a gas flow regulating valve; s, wetting an area; x, axial direction; y, horizontal direction; z, vertical direction.
Detailed Description
Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.
In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical, but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.
The applicant notices that the lithium analysis problem exists in the inner ring part of the battery cell which is completely wound and subjected to the pre-pressing and shaping process in the using process. The applicant carries out research and analysis on the structure and the processing process of the battery core. The applicant found that the clearance between the positive plate and the negative plate of the cell is too large, thereby causing the problem of lithium precipitation. After further research and analysis, the applicant finds that after the battery core is wound, the battery core needs to be clamped by the blanking assembly and taken down from the winding needle, then the taken-down battery core is stretched to be flat by the blanking assembly, then the blanking assembly is moved away, and prepressing and sizing are carried out on the battery core. After the battery cell which is taken down is stretched to be flat by the blanking assembly, the diaphragm located in the inner ring is stretched to be in a tensioning state. After the blanking assembly is moved away, the diaphragm positioned in the inner ring is in a free state, so that the diaphragm in a tensioning state can retract, the positive plate or the negative plate of the inner ring is driven to move inwards along the radial direction of the battery cell, and the gap between the positive plate and the negative plate is overlarge.
Based on the above problems discovered by the applicant, the applicant improves the structure of the cell manufacturing equipment, and the following further describes the embodiments of the present application.
For a better understanding of the present application, embodiments of the present application are described below with reference to fig. 1 to 12.
Referring to fig. 1, a battery cell manufacturing apparatus 1 according to an embodiment of the present application includes a first unwinding device 2, a second unwinding device 3, a tension adjusting roller 4, an image recognition device 5, and a winding needle 6. The first unwinding device 2 is used for placing the rolled pole piece 7. The second unwinding device 3 is used for placing the rolled diaphragm 8. The pole piece 7 released by the first unwinding device 2 and the diaphragm 8 released by the second unwinding device 3 can pass through the dancer roller 4 respectively. The dancer roller 4 is configured to adjust the tension of the pole piece 7 and/or the diaphragm 8. The tension adjusting roller 4 can keep the pole piece 7 and the diaphragm 8 in a tensioned state, and the possibility that the pole piece 7 or the diaphragm 8 enters the winding needle 6 in a loose state to cause the pole piece 7 or the diaphragm 8 to wrinkle is reduced. The pole piece 7 and the separator 8 passing through the dancer roller 4 enter the winding needle 6 and are wound by the winding needle 6. The image recognition device 5 can be used to detect whether the diaphragm 8 and the pole piece 7 are aligned with each other in the axial direction of the winding needle 6. The image recognition means 5 may be an industrial camera.
The battery cell manufacturing apparatus 1 according to the embodiment of the present application further includes a composite device 20. The compounding device 20 is located upstream of the winding needle 6. Upstream means that the process is advanced in the machining process. During the processing, the pole piece 7 and the diaphragm 8 pass through the compounding device 20 and then enter the winding needle 6. The compounding device 20 is configured to wet at least one of the adjacent pole pieces 7 and the membranes 8 to compound the adjacent pole pieces 7 and membranes 8 into the winding needle 6. Illustratively, the composite device 20 may wet the surface of the pole piece 7 facing the membrane 8 and/or the surface of the membrane 8 facing the pole piece 7. Illustratively, the composite device 20 may wet adjacent pole pieces 7 and separator 8 simultaneously.
The pole piece 7 and the diaphragm 8 of the embodiment of the application can be both a plurality of. The pole pieces 7 and the diaphragms 8 are arranged alternately. At least two of which may be wetted by the compounding device 20. Illustratively, the pole piece 7 and the diaphragm 8 may both be two. Any one of the adjacent pole pieces 7 and one of the membranes 8 may be wetted, or two adjacent pole pieces 7 and one of the membranes 8 between the two pole pieces 7 may be wetted, or two adjacent membranes 8 and one of the pole pieces 7 between the two membranes 8 may be wetted.
The compound device 20 may be wetted by releasing liquid drops or by condensing high-temperature gas on the pole piece 7 or the diaphragm 8.
The dancer roll 4 of the embodiment of the application can be located at the upstream of the composite device 20, so that the composite device 20 is prevented from corroding the dancer roll 4 when wetting the pole pieces 7 and/or the diaphragm 8, and further short circuit in the battery cell 9 caused by metal chips falling off from the dancer roll 4 is avoided.
Referring to fig. 2 and 3, the winding needle 6 of the embodiment of the present application includes a winding area 6 a. The winding region 6a is a region having a predetermined width in the axial direction X of the winding needle 6 itself. The winding needle 6 winds the pole piece 7 and the separator 8 on the winding area 6 a. The winding of the pole piece 7 and the separator 8 is completed in the winding area 6 a.
In some embodiments, referring to FIG. 4, the winding pin 6 includes a first half-shaft 61 and a second half-shaft 62. The first half shaft 61 and the second half shaft 62 may move toward or away from each other. The first half shaft 61 and the second half shaft 62 are provided with blanking abdicating grooves 6 b. The battery core manufacturing equipment 1 of the embodiment of the application further includes a blanking assembly 10. The blanking assembly 10 is configured to remove the battery cell 9 from the winding needle 6. The blanking assembly 10 includes an inner clamp pin 101 and an outer clamp pin 102. After the winding is completed, the inner clamping pins 101 of the feeding assembly 10 can be inserted into the two feeding relief grooves 6b of the winding pin 6. The inside clamp pin 101 and the outside clamp pin 102 are configured to collectively clamp the completely wound battery cell 9. After the inner side clamping pin 101 and the outer side clamping pin 102 clamp the battery cell 9, the first half shaft 61 and the second half shaft 62 move close to each other, so that the winding pin 6 is separated from the battery cell 9 in a tight fit state, and the blanking assembly 10 is convenient to remove the battery cell 9 from the winding pin 6.
In some embodiments, referring to fig. 4 and 5, two blanking assemblies 10 are spaced apart in the horizontal direction Y. The two blanking assemblies 10 each hold the battery cell 9 at a different position. In the horizontal direction Y, the two blanking assemblies 10 are moved away from each other, thereby stretching the battery cell 9 into a flat shape. The areas of the battery cell 9 corresponding to the two blanking assemblies 10 may form bending regions 9 a. The area of the battery cell 9 corresponding to the two blanking assemblies 10 is opposite to the blanking abdicating groove 6b of the winding needle 6. A flat area is formed between the two bending areas 9 a.
In some embodiments, referring to fig. 6, the outer surface of the winding needle 6 is provided with a groove 6 c. The groove 6c extends in the axial direction X of the winding needle 6. The more than two grooves 6c are arranged along the circumferential direction of the winding needle 6 at intervals, so that the contact area between the battery cell 9 and the winding needle 6 is reduced, the difficulty of pulling the battery cell 9 out of the winding needle 6 can be reduced even when the liquid released by the compound device 20 flows to the winding needle 6, and the possibility of poor needle pulling of the winding needle 6 is reduced.
Referring to fig. 7, at least one of the pole piece 7 and the separator 8 is wetted by the composite device 20 to form a wetted region S. In the wetting zone S, the pole piece 7 and the diaphragm 8 after contact with each other are connected.
The battery cell manufacturing equipment 1 of the embodiment of the application winds the pole piece 7 and the diaphragm 8 through the winding needle 6 to form the battery cell 9. Before the pole piece 7 and the diaphragm 8 enter the winding needle 6, at least one of the pole piece 7 and the diaphragm 8 is wetted by using a composite device 20, so that the adjacent pole piece 7 and the diaphragm 8 entering the winding needle 6 are compositely connected, and the diaphragm 8 in the battery cell 9 is not in a free state any more, but is restrained. After the battery cell 9 after being wound is stretched to be flat, the diaphragm 8 is restrained, so that the diaphragm 8 is not easy to accumulate tensile stress and retract, and is not easy to collapse, thereby reducing the possibility that the pole pieces 7 are driven to move inwards along the radial direction of the battery cell 9 due to retraction of the diaphragm 8, causing overlarge gaps between the adjacent pole pieces 7, and further reducing the possibility of lithium precipitation. Because the pole piece 7 and the diaphragm 8 are connected in a wetting mode, the pole piece 7 and the diaphragm 8 are not rigidly connected, the pole piece 7 and the diaphragm 8 can relatively move, but are not easily separated from each other, and therefore, the diaphragm 8 is not easily wrinkled in the process of removing the battery cell 9 from the winding needle 6 and flattening the battery cell 9.
In some embodiments, the compounding device 20 is configured to: during winding of the pole pieces 7 by the winding needle 6 in a first turn, the compound device 20 wets at least one of the pole pieces 7 and the separator 8 of the adjacent first turn. Illustratively, the pole piece 7 and the diaphragm 8 enter the winding needle 6 together and are wound by the winding needle 6. When the pole piece 7 is wound on the winding needle 6 for the first turn, the pole piece 7 and the diaphragm 8 form a winding starting turn. Alternatively, the winding needle 6 winds the diaphragm 8N times in advance, and then the pole piece 7 enters the winding needle 6 and is wound by the winding needle 6. The value range of N may be: n is more than or equal to 1 and less than or equal to 5. When the pole piece 7 is wound on the winding needle 6 for the first turn, the pole piece 7 and the diaphragm 8 form a winding starting turn. After the battery cell 9 which finishes winding is flattened, the diaphragm 8 corresponding to the pole piece 7 which winds the first circle is easy to retract, deform or collapse, so that the diaphragm 8 and the pole piece 7 which wind the initial circle can be compositely connected, the wetting time can be shortened, the wetting area S can be reduced under the condition that the pole piece 7 and the diaphragm 8 are not easy to separate, and the influence of the wetting process on the whole winding work efficiency and the cost of the wetting process can be reduced. Illustratively, the compound device 20 may wet a portion of the pole piece 7 and the membrane 8 or the entire pole piece 7 and the membrane 8 during the winding of the pole piece 7 by the winding needle 6 for the first winding.
In some examples, the compound device 20 can wet at least a portion of the pole piece 7 and the septum 8 corresponding to the opening of the blanking relief groove 6b of the winding needle 6. After the battery cell 9 is flattened, at least a part of the pole piece 7 and the diaphragm 8 corresponding to the opening of the blanking abdicating slot 6b is located in the bending area 9a of the battery cell 9, so that the possibility that the clearance between the adjacent pole pieces 7 of the bending area 9a is too large due to the retraction of the diaphragm 8 of the battery cell 9 in the bending area 9a is effectively reduced, and the possibility that the lithium precipitation occurs in the bending area 9a is further reduced.
In some embodiments, referring to fig. 8, the compounding device 20 includes a liquid release device 21. The liquid releasing device 21 is configured to: liquid is released on at least one of the adjacent pole piece 7 and the diaphragm 8 to form a wetting area S, and the axial dimension of the wetting area S is smaller than that of the winding area 6a along the axial direction X of the winding needle 6. The pole piece 7 and the diaphragm 8 have opposite edges in the axial direction X. When the pole piece 7 and the diaphragm 8 are wound on the winding needle 6, the respective two edges are aligned with the two borders of the winding area 6 a. When the wetting area S is formed on the pole piece 7 or the diaphragm 8, the wetting area S is located between two edges, and a non-wetting area is formed between the wetting area S and the two edges. Because the liquid has certain fluidity, the pole piece 7 and the diaphragm 8 can press the liquid against each other after entering the winding needle 6, so that the liquid between the wound pole piece 7 and the diaphragm 8 overflows out of the wetting area S. The liquid overflowing out of the wetting area S can flow to a non-wetting area formed between the wetting area S and the two edges, so that the liquid is not easy to overflow from the two edges, the possibility that the electric core 9 and the winding needle 6 are adhered to each other to cause the winding needle 6 to have poor needle pulling due to the fact that the liquid overflows to the winding needle 6 is reduced, and the possibility that the liquid is splashed to other structural parts after overflowing or overflowing to cause corrosion damage of the structural parts is also reduced.
In some embodiments, the manner in which the liquid is released by the liquid release device 21 may be spraying. The liquid discharge means 21 has a liquid discharge port. The liquid having a predetermined pressure ejected from the liquid ejection port may be in the form of droplets. The manner in which the liquid is released by the liquid release device 21 may be dripping. The liquid discharge means 21 has a liquid outlet. The liquid dropped from the liquid outlet may be in the form of droplets. The image recognition device 5 is required to have a good detection field of view when it is used to detect whether the separator 8 and the pole piece 7 are aligned with each other in the axial direction of the winding needle 6. When the liquid released by the liquid releasing device 21 is in the form of liquid droplets, the liquid droplets are not easy to block the detection view of the image recognition device 5, which is beneficial to ensuring the normal operation of the image recognition device 5.
In some embodiments, the liquid released by the liquid releasing device 21 is volatile, so that the liquid can gradually volatilize and disappear in the pre-pressed battery cell 9, and the possibility that the liquid may adversely affect the performance of the battery cell 9 is effectively reduced. Illustratively, the liquid includes at least one of polycarbonate and dimethyl carbonate. The manufactured battery cell 9 needs to be soaked by the electrolyte in the use process, and the polycarbonate and the dimethyl carbonate belong to the components of the electrolyte, so that even if the liquid is incompletely volatilized, the possibility that the liquid can further cause adverse effects on the performance of the battery cell 9 can be further reduced.
In some embodiments, referring to FIG. 8, the compounding device 20 includes an on-off valve 22. The on-off valve 22 is configured to open or close the liquid discharge device 21 according to the winding angle of the winding needle 6. For example, the winding angle is set to 0 ° in the stationary state of the winding needle 6. After the winding needle 6 is started and rotated by a predetermined angle, the starting positions of the pole piece 7 and the diaphragm 8 corresponding to the blanking relief groove 6b of the winding needle 6 are moved to the liquid releasing device 21, and the switching valve 22 opens the liquid releasing device 21 to release the liquid. After the winding needle 6 continues to rotate for a predetermined angle, the end positions of the pole piece 7 and the diaphragm 8 corresponding to the blanking relief groove 6b of the winding needle 6 are moved to the liquid release device 21, and the on-off valve 22 closes the liquid release device 21. Alternatively, after the winding needle 6 is actuated and rotated by a predetermined angle, the starting position of the pole piece 7 is moved to the liquid discharge means 21, and the on-off valve 22 opens the liquid discharge means 21 to discharge the liquid. After the winding needle 6 continues to rotate by a predetermined angle, the end position of the pole piece 7 for forming the first turn on the winding needle 6 is moved to the liquid discharge means 21, and the on-off valve 22 closes the liquid discharge means 21. Therefore, by controlling the liquid discharge device 21 through the on-off valve 22, the position and the area size of the wetting region S formed on the pole piece 7 or the diaphragm 8 by the liquid discharge device 21 can be precisely controlled.
In some embodiments, the compounding device 20 includes three liquid release devices 21. Three liquid releasing devices 21 are arranged at intervals. The winding needle 6 winds the two pole pieces 7 and the two diaphragms 8 to form a cell 9. The two pole pieces 7 have opposite polarities, one of which is a positive pole piece and the other is a negative pole piece. In the two pole pieces 7 and the two diaphragms 8, a liquid release device 21 is arranged between the adjacent pole pieces 7 and diaphragms 8, so that the composite device 20 can simultaneously wet at least one of the adjacent pole pieces 7 and diaphragms 8, and the wetting work efficiency is effectively improved. The number of the liquid discharge devices 21 is not limited to three, and may be four or more, so that at least one liquid discharge device 21 is provided in correspondence with the adjacent pole piece 7 and the diaphragm 8.
In some embodiments, referring to fig. 9, the cell manufacturing apparatus 1 further includes a translation device 60. The compound device 20 is connected to a translation device 60. The translation device 60 is configured to drive the composite device 20 to move horizontally and/or vertically, so that the composite device 20 can be moved to an optimal working position to perform the wetting work, the composite device 20 can be ensured to wet the predetermined area of the pole piece 7 or the membrane 8 more accurately, and can be retracted to an initial position after the wetting work is completed, and the possibility of generating adverse effects on the winding process is reduced. Illustratively, the translation device 60 includes a base, a horizontal rail, and a vertical rail. The horizontal guide rail is arranged on the base, and the vertical guide rail is movably connected to the horizontal guide rail along the horizontal direction Y. The complex device 20 is movably connected to the vertical rail in the vertical direction Z.
In some embodiments, referring to fig. 10, the cell manufacturing apparatus 1 further includes a flow detection module 30, a flow regulation module 40, and a controller 50. The flow detection module 30 is configured to collect a flow signal of the liquid released from the liquid releasing device 21. The controller 50 controls the flow rate adjusting module 40 according to the liquid flow rate signal collected by the flow rate detecting module 30 to adjust the flow rate of the liquid released by the liquid releasing device 21, so that the liquid releasing amount of the liquid releasing device 21 can be accurately controlled. Therefore, on one hand, the possibility that the electric core 9 and the winding needle 6 are adhered to each other to cause poor needle pulling of the winding needle 6 due to excessive liquid release amount is reduced, and the possibility that the structural part is corroded and damaged due to splashing to other structural parts after the liquid overflows or overflows is also reduced; on the other hand, the possibility that the pole piece 7 and the diaphragm 8 are separated due to too small amount of liquid release is reduced.
In some embodiments, referring to fig. 11, the cell manufacturing apparatus 1 further includes a purge device 70. The purging device 70 is configured to purge the winding needle 6 to clean the liquid remaining on the winding needle 6, so that on one hand, the winding needle 6 is ensured to have good cleanliness, and the possibility that the battery cell 9 is adhered to the winding needle 6 due to the liquid remaining on the winding needle 6, and the needle pulling is poor is reduced; on the other hand, when the liquid is volatile, the purging device 70 can accelerate the removal of the liquid, which is beneficial to improving the winding efficiency. Illustratively, the purge device 70 cleans the winding needle 6 by blowing air to the outer circumferential surface of the winding needle 6. By adopting the gas purging mode, the possibility of tiny debris on the surface of the winding needle 6 in the cleaning process can be reduced, and the possibility of short circuit caused by the debris inside the battery cell 9 when the winding needle 6 winds the battery cell 9 can be further reduced.
In some embodiments, referring to fig. 12, the battery cell manufacturing apparatus 1 further includes an angle adjustment device 80. The purge device 70 is provided to the angle adjustment device 80. The angle adjusting device 80 is configured to adjust the purging angle of the purging device 70, so that the purging device 70 can purge each region of the winding needle 6 at an optimal angle, which is beneficial to ensuring the consistency of the purging effect and the purging efficiency. For example, the angle adjustment device 80 may be a mechanical arm, so that the purge device 70 has a large range of motion and is flexible in angle adjustment.
In some embodiments, the cell manufacturing apparatus 1 further includes a gas flow rate adjustment valve 90. The gas flow rate adjustment valve 90 is configured to adjust the flow rate of the gas ejected from the purge device 70. When the amount of liquid remaining on the winding needle 6 is small, the gas flow rate can be reduced. When the amount of the liquid remaining on the winding needle 6 is large, the gas flow can be increased, so that the purging duration of the purging device 70 can be accurately controlled, and the purging device 70 can complete the cleaning work of the winding needle 6 within a preset time no matter how much or little liquid remains on the winding needle 6.
Referring to fig. 13, an embodiment of the present application further provides a method for manufacturing a battery cell 9, which includes:
wetting at least one of the adjacent pole pieces 7 and separator 8;
winding the pole pieces 7 and the diaphragm 8, wherein adjacent pole pieces 7 and diaphragms 8 are connected.
In the method for manufacturing the battery cell 9 according to the embodiment of the present application, before the pole piece 7 and the diaphragm 8 start to be wound, at least one of the pole piece 7 and the diaphragm 8 is wetted, so that the wound adjacent pole piece 7 and diaphragm 8 are compositely connected, and the diaphragm 8 in the battery cell 9 is not in a free state but is constrained. After the battery cell 9 after being wound is stretched to be flat, the diaphragm 8 is restrained, so that the diaphragm 8 is not easy to accumulate tensile stress and retract, and is not easy to collapse, thereby reducing the possibility that the pole pieces 7 are driven to move inwards along the radial direction of the battery cell 9 due to retraction of the diaphragm 8, causing overlarge gaps between the adjacent pole pieces 7, and further reducing the possibility of lithium precipitation. Because the pole piece 7 and the diaphragm 8 are connected in a wetting mode, the pole piece 7 and the diaphragm 8 are not fixedly connected, the pole piece 7 and the diaphragm 8 can still relatively move, but are not easily separated from each other, and the diaphragm 8 is not easily wrinkled in the process of transferring the battery cell 9 and flattening the battery cell 9.
In some embodiments, during winding of a pole piece 7 into a first turn, at least one of the pole piece 7 and the separator 8 of an adjacent first turn is wetted. After the battery cell 9 which finishes winding is flattened, the diaphragm 8 corresponding to the pole piece 7 which winds the first circle is more easily retracted, deformed or collapsed relative to the diaphragm 8 which is close to the outer circle, so that the pole piece 7 which winds the first circle and the diaphragm 8 corresponding to the pole piece 7 which winds the first circle can be compositely connected, the wetting duration can be favorably shortened, the wetting area S can be favorably reduced under the condition that the pole piece 7 and the diaphragm 8 are not easily separated, and the influence of the wetting process on the whole winding work efficiency and the cost of the wetting process can be favorably reduced. For example, during winding of the pole piece 7 in the first winding, the composite device 20 may wet a part of the separator 8 corresponding to the pole piece 7 wound in the first winding and the pole piece 7 wound in the first winding or wet all of the separator 8 corresponding to the pole piece 7 wound in the first winding and the pole piece 7 wound in the first winding.
In some embodiments, liquid is released on at least one of the adjacent pole piece 7 and separator 8 to form wetted region S. The pole piece 7 and the separator 8 have two edges in a direction perpendicular to the winding direction. When the wetting area S is formed on the pole piece 7 or the diaphragm 8, the wetting area S is located between two edges, and a non-wetting area is formed between the wetting area S and the two edges. Since the liquid has certain fluidity, the wound pole piece 7 and the wound membrane 8 press the liquid against each other, so that the liquid between the wound pole piece 7 and the wound membrane 8 overflows out of the wetting area S. The liquid overflowing out of the wetting area S flows to a non-wetting area formed between the wetting area S and the two edges, so that the liquid is not easy to overflow from the two edges, and the possibility of corrosion damage of the structural part caused by splashing to other structural parts after the liquid overflows or overflows is reduced.
In some embodiments, more than two wetting regions S are formed on at least one of adjacent pole pieces 7 and separator 8. Two or more wet areas S are provided at intervals in the winding direction.
In some embodiments, the pole piece 7 and the septum 8 are wound using a winding needle 6. The winding needle 6 comprises a blanking abdicating groove 6 b. And wetting at least one part of the pole piece 7 and the diaphragm 8 corresponding to the opening of the blanking abdicating groove 6 b. After the battery cell 9 is flattened, at least a part of the pole piece 7 and the diaphragm 8 corresponding to the opening of the blanking abdicating slot 6b is located in the bending area 9a of the battery cell 9, so that the possibility that the clearance between the adjacent pole pieces 7 of the bending area 9a is too large due to the retraction of the diaphragm 8 of the battery cell 9 in the bending area 9a is effectively reduced, and the possibility that the lithium precipitation occurs in the bending area 9a is further reduced.
In some embodiments, the manner of releasing the liquid may be spraying. The sprayed liquid may be in the form of droplets. The manner of releasing the liquid may also be dripping. The dropped liquid may be in the form of droplets. The image recognition device 5 is required to have a good detection field of view when it is used to detect whether the separator 8 and the pole piece 7 are aligned with each other in the axial direction of the winding needle 6. When the liquid released by the liquid releasing device 21 is in the form of liquid droplets, the liquid droplets are not easy to block the detection view of the image recognition device 5, which is beneficial to ensuring the normal operation of the image recognition device 5.
In some embodiments, the manner of releasing the liquid may also be fumigation. The fumigated liquid may be in the form of a mist. The atomized liquid may condense on the pole piece 7 or the membrane 8.
In some embodiments, the released liquid has volatility, so that the liquid can gradually volatilize and disappear in the electric core 9 after the pre-pressing forming, and the possibility that the liquid has adverse effects on the performance of the electric core 9 is effectively reduced. Illustratively, the liquid includes at least one of polycarbonate and dimethyl carbonate. The manufactured battery cell 9 needs to be soaked by the electrolyte in the use process, and the polycarbonate and the dimethyl carbonate belong to the components of the electrolyte, so that when the liquid is incompletely volatilized, the possibility that the liquid can further cause adverse effects on the performance of the battery cell 9 can be further reduced.
In some embodiments, the pole piece 7 and the separator 8 are wound using a winding needle 6 to form a cell 9. The method for manufacturing the battery cell 9 further includes: and feeding and discharging the battery cell 9 from the winding needle 6, and cleaning the winding needle 6. After the residual liquid on the winding needle 6 is cleaned, the winding needle 6 can be ensured to have good cleanliness, and the possibility of poor needle pulling caused by adhesion of the battery cell 9 and the winding needle 6 due to the residual liquid on the winding needle 6 is reduced.
In some examples, the wrap pins 6 are cleaned by blowing gas to the wrap pins 6. By adopting the gas purging mode, the possibility of tiny debris on the surface of the winding needle 6 in the cleaning process can be reduced, and the possibility of short circuit caused by the debris inside the battery cell 9 when the winding needle 6 winds the battery cell 9 can be further reduced. In addition, when the liquid has volatility, the gas is blown to accelerate the removal of the liquid, which is beneficial to improving the winding work efficiency.
In some embodiments, the battery cell manufacturing apparatus 1 of the above-described embodiment may perform the battery cell 9 manufacturing method of the above-described embodiment to manufacture the battery cell 9.
While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.
Claims (11)
1. A battery cell manufacturing apparatus, the battery cell including a pole piece and a separator, the battery cell manufacturing apparatus comprising:
a winding needle configured to wind the pole piece and the diaphragm, the winding needle comprising a blanking abdication slot;
a compounding device upstream of the winding needle, the compounding device configured to: and wetting at least one part of the pole piece and the diaphragm of the first circle corresponding to the opening of the blanking abdicating groove in the process of winding the pole piece by the winding needle for the first circle, so that the adjacent pole piece entering the winding needle is connected with the diaphragm.
2. The cell manufacturing apparatus of claim 1, wherein the winding pin includes a winding area, the compounding device includes a liquid release device configured to: releasing liquid on at least one of the adjacent pole pieces and the membrane to form a wetted area, and an axial dimension of the wetted area is smaller than an axial dimension of the wound area along an axial direction of the winding needle.
3. The cell manufacturing apparatus according to claim 2, wherein the liquid releasing device is configured to release the liquid in a droplet shape; alternatively, the compound device includes an on-off valve configured to open or close the liquid release device according to a winding angle of the winding needle.
4. The battery cell manufacturing equipment according to claim 2, wherein the number of the liquid releasing devices is three or more, and the three or more liquid releasing devices are arranged at intervals, so that at least one liquid releasing device is arranged in correspondence with the adjacent pole piece and the diaphragm.
5. The cell manufacturing apparatus of claim 2, wherein:
the battery core manufacturing equipment further comprises a flow detection module, a flow regulation module and a controller, wherein the flow detection module is configured to collect a flow signal of the liquid released by the liquid releasing device, and the controller controls the flow regulation module according to the liquid flow signal to regulate the flow of the liquid released by the liquid releasing device.
6. The cell manufacturing apparatus of claim 1, wherein:
the battery core manufacturing equipment further comprises a translation device, the composite device is connected to the translation device, and the translation device is configured to drive the composite device to move horizontally and/or vertically.
7. The cell manufacturing apparatus of claim 1, further comprising a dancer roll upstream of the compounding device, the dancer roll configured to adjust tension of the pole piece and/or the diaphragm.
8. The battery cell manufacturing equipment according to claim 1, wherein the outer surface of the winding needle is provided with a groove, the groove extends in the axial direction of the winding needle, and more than two grooves are arranged at intervals in the circumferential direction of the winding needle.
9. The cell manufacturing apparatus of claim 1, further comprising a purging device configured to purge the winding needle to clean the winding needle.
10. The cell manufacturing apparatus of claim 9, wherein:
the battery cell manufacturing equipment further comprises an angle adjusting device, the purging device is arranged on the angle adjusting device, and the angle adjusting device is configured to adjust a purging angle of the purging device; and/or the presence of a gas in the gas,
the battery cell manufacturing equipment further comprises a gas flow regulating valve, and the gas flow regulating valve is configured to regulate the flow of gas ejected by the purging device.
11. A method of manufacturing a cell, comprising:
wetting at least one of adjacent pole pieces and separator membranes;
winding the pole piece and the separator using a winding needle;
the coil needle comprises a blanking abdicating groove, and the pole piece is wetted in the process of winding the first circle of the pole piece, the opening of the blanking abdicating groove corresponds to the pole piece of the first circle and at least one part of the diaphragm, and the pole piece is adjacent to the diaphragm.
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| CN115799592B (en) * | 2022-10-13 | 2023-11-10 | 宁德时代新能源科技股份有限公司 | Battery cell blanking equipment and method |
| CN116565289B (en) * | 2023-07-11 | 2023-11-21 | 宁德时代新能源科技股份有限公司 | Winding system and winding method thereof |
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