CN117594739A - Intermittent thermal compounding device and method for pole pieces - Google Patents
Intermittent thermal compounding device and method for pole pieces Download PDFInfo
- Publication number
- CN117594739A CN117594739A CN202311644786.6A CN202311644786A CN117594739A CN 117594739 A CN117594739 A CN 117594739A CN 202311644786 A CN202311644786 A CN 202311644786A CN 117594739 A CN117594739 A CN 117594739A
- Authority
- CN
- China
- Prior art keywords
- roller
- hot
- pole piece
- compensation
- piece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000013329 compounding Methods 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000007731 hot pressing Methods 0.000 claims abstract description 143
- 239000002131 composite material Substances 0.000 claims abstract description 90
- 230000005404 monopole Effects 0.000 claims abstract description 66
- 230000007246 mechanism Effects 0.000 claims abstract description 50
- 238000004804 winding Methods 0.000 claims abstract description 38
- 150000001875 compounds Chemical class 0.000 claims abstract description 34
- 230000009471 action Effects 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 abstract description 16
- 241001131688 Coracias garrulus Species 0.000 description 309
- 238000007906 compression Methods 0.000 description 15
- 230000006835 compression Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/06—Electrodes for primary cells
- H01M4/08—Processes of manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The intermittent thermal pole piece compounding device and the thermal pole piece compounding method are used for thermally compounding a compound pole piece and a monopole piece and comprise the following steps: the back-up roll is positioned behind the hot-press roll in the direction of taking away the material belt, and the back-up roll is driven to rotate when the material belt is conveyed; the hot-pressing roller can press the compensation roller, the pressure of the hot-pressing roller on the compensation roller is regulated by the hot-pressing roller pressure control mechanism, when the pressure of the hot-pressing roller on the compensation roller reaches a thermal compounding pressure threshold, the compound pole piece and the monopole piece are thermally compounded together, and the hot-pressing roller executes the actions that the pressure on the compensation roller reaches the thermal compounding pressure threshold-the pressure on the compensation roller is smaller than the thermal compounding pressure threshold-the pressure on the compensation roller reaches the thermal compounding pressure threshold according to a set time interval, so that intermittent thermal compounding of the compound pole piece and the monopole piece is realized. The invention solves the problem of wrinkling of the inner layer material belt when the integral composite sheet is wound into the battery core, and improves the winding precision and the winding efficiency.
Description
Technical Field
The invention belongs to the technical field of lithium battery manufacturing equipment, and particularly relates to a pole piece intermittent thermal compounding device and a pole piece thermal compounding method for pole piece thermal compounding.
Background
The square lithium battery cell is mainly prepared by two processes of winding and lamination. The traditional winding process is to divide the positive plate, the negative plate and the diaphragm into open rolls, and then concentrate the rolls on a winding needle to wind to form the battery cell. The traditional winding process is difficult to ensure the winding precision and the winding efficiency due to the large quantity of the coiled material strips. Later, a composite pole piece formed by compositing a diaphragm and a negative pole piece appears, the structure of the composite pole piece is diaphragm-pole piece-diaphragm, and the diaphragm and the negative pole piece are thermally composited and then the composite pole piece and the positive pole piece are coiled into an electric core through a winding needle. As the diaphragm and the negative electrode plate are compounded together in advance, the composite electrode plate and the positive electrode plate are wound by the winding needle to form the layer battery core, the number of the material strips is reduced, and the winding precision and the winding efficiency are improved.
In order to meet the higher quality requirement of the battery core, the winding precision and the winding efficiency are further improved, and the composite pole piece and the positive pole piece can be further subjected to thermal compounding and then wound through a winding needle. However, because the composite pole piece is formed by compounding multiple layers of material belts and has a certain thickness, when the winding needle is wound, the circumferences of the material belts wound on the inner side of the winding needle and the outer side of the winding needle are inconsistent, but the lengths of the material belts (the diaphragm and the pole piece) of each layer in the composite pole piece are consistent, the wound pole piece of the inner layer of the battery cell is easy to generate wrinkling, and the quality of the battery cell is affected.
Disclosure of Invention
The invention aims to provide a pole piece intermittent thermal compounding device and a pole piece thermal compounding method capable of avoiding wrinkling of pole pieces at the inner layer of a battery cell.
In order to achieve the above object, the present invention adopts the following technical solutions:
the intermittent thermal compounding device of the pole piece is used for thermally compounding the compound pole piece and the monopole piece and comprises the following components: the machine frame is provided with a compensation roller, a hot pressing roller and a leaning roller, wherein the compensation roller can rotate around the axis of the machine frame under the drive of a compensation roller rotation driving mechanism, and the hot pressing roller can rotate around the axis of the machine frame under the drive of the hot pressing roller rotation driving mechanism; the leaning roll is arranged behind the hot pressing roll in the feeding belt direction, and the leaning roll is driven to rotate when the feeding belt is fed; the hot-pressing roller can press the compensation roller, the pressure of the hot-pressing roller on the compensation roller is regulated by a hot-pressing roller pressure control mechanism, when the pressure of the hot-pressing roller on the compensation roller reaches a hot-compounding pressure threshold, the compound pole piece and the monopole piece are thermally compounded together, and the hot-pressing roller executes the actions that the pressure on the compensation roller reaches the hot-compounding pressure threshold-the pressure on the compensation roller is smaller than the hot-compounding pressure threshold-the pressure on the compensation roller reaches the hot-compounding pressure threshold according to a set time interval, so that intermittent hot compounding of the compound pole piece and the monopole piece is realized.
According to the intermittent thermal compounding device for the pole piece, the frame is provided with the translatable hot-pressing roller carriage, and the hot-pressing roller is arranged on the hot-pressing roller carriage; the hot-pressing roller carriage translates under the control of the hot-pressing roller translation driving mechanism, and can drive the hot-pressing roller to approach and be tightly pressed on the compensation roller or leave the compensation roller.
According to the intermittent thermal compounding device for the pole pieces, optionally, the hot pressing roller rotary driving unit comprises a second rotary driving motor, an output shaft of the second rotary driving motor is connected with a transmission shaft through a coupler, and the transmission shaft is connected with one end of the hot pressing roller through a one-way bearing.
In the intermittent thermal compounding device for pole pieces, optionally, the rotating speed of the hot-pressing roller is lower than that of the compensating roller.
The intermittent thermal compounding device for the pole piece is characterized in that the hot-pressing roller pressure control mechanism is a pressure cylinder.
The intermittent thermal compounding device for the pole piece is characterized in that the compensation roller is provided with a compensation roller heating rod, and the compensation roller heating rod is arranged along the axis of the compensation roller and rotates along with the compensation roller.
According to the intermittent thermal compounding device for the pole pieces, optionally, the hot-press roller heating rod is arranged inside the hot-press roller, is arranged along the axis of the hot-press roller and rotates along with the hot-press roller.
The pole piece thermal compounding method using the pole piece intermittent thermal compounding device comprises the following steps:
winding a composite pole piece and a monopole piece on the compensation roller, wherein the composite pole piece is positioned at the inner side, and the monopole piece is positioned at the outer side;
the hot-pressing roller and the compensating roller rotate around respective axes according to set speed, the hot-pressing roller and the leaning roller are uniformly pressed on the compensating roller, the composite pole piece and the monopole piece are fed from between the hot-pressing roller and the compensating roller and between the leaning roller and the compensating roller, and the compensating roller drives the whole composite piece after hot-pressing to be driven backwards when rotating;
in the tape feeding process, the hot-pressing roller pressure control mechanism adjusts the pressure of the hot-pressing roller on the compensation roller, the action that the pressure of the hot-pressing roller on the compensation roller reaches a thermal compounding pressure threshold value, namely that the pressure of the hot-pressing roller on the compensation roller is smaller than the thermal compounding pressure threshold value, is repeatedly executed according to a set time interval, the compound pole piece and the monopole piece are compounded together when the pressure of the hot-pressing roller on the compensation roller reaches the thermal compounding pressure threshold value, and the compound pole piece and the monopole piece cannot be compounded when the pressure of the hot-pressing roller on the compensation roller is smaller than the thermal compounding pressure threshold value, so that intermittent thermal compounding of the compound pole piece and the monopole piece is realized.
The pole piece thermal compounding method as described above, further, the winding angle of the compound pole piece and the monopole piece on the compensation roller is less than 180 °.
The pole piece thermal compounding method using the pole piece intermittent thermal compounding device comprises the following steps:
winding a composite pole piece and a monopole piece on the compensation roller, wherein the composite pole piece is positioned at the inner side, and the monopole piece is positioned at the outer side;
the hot-press roller and the compensation roller rotate around respective axes according to set speed, the leaning roller is pressed on the compensation roller, the composite pole piece and the monopole piece are taken away from between the hot-press roller and the compensation roller and between the leaning roller and the compensation roller, and the compensation roller drives the whole composite piece after hot-pressing to be driven backwards when rotating;
in the process of tape feeding, the hot-pressing roller translation driving mechanism controls the hot-pressing roller to approach and press the compensation roller, so that the pressure of the hot-pressing roller on the compensation roller reaches a thermal composite pressure threshold value, and the composite pole piece and the monopole piece are composited together;
after thermal compounding is completed, the hot-pressing roller translation driving mechanism controls the hot-pressing roller to leave the compensation roller, the composite pole piece and the single pole piece continue to be carried out, and the hot-pressing roller translation driving mechanism controls the hot-pressing roller to be pressed on the compensation roller according to a set time interval to thermally compound the composite pole piece and the single pole piece or leave the compensation roller, so that intermittent thermal compounding of the composite pole piece and the single pole piece is realized.
The pole piece thermal compounding method as described above, further, the winding angle of the compound pole piece and the monopole piece on the compensation roller is 180 °.
According to the technical scheme, the intermittent thermal compounding device is provided with the hot pressing roller, the compensating roller and the leaning roller, the pressure of the hot pressing roller on the compensating roller is controlled to reach a thermal compounding pressure threshold value according to a set time interval, the compound pole piece and the monopole piece are subjected to intermittent thermal compounding to form the integral compound piece with inconsistent inner and outer layer material strips, and the difference between the lengths of the inner and outer layer pole pieces (the lengths of the compound pole piece and the monopole piece) is consistent with the difference between the lengths of the inner and outer layers required by winding of the winding needle, so that the problem of wrinkling of the inner layer material strips when the integral compound piece is wound into an electric core is solved, and the winding precision and the winding efficiency are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the following description will briefly explain the embodiments or the drawings required for the description of the prior art, it being obvious that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of a pole piece intermittent thermal compounding device according to an embodiment of the present invention;
FIG. 2 is a schematic view of another angle of the intermittent thermal compound device for pole pieces according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a thermo roll and a compensation roll according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a pole piece intermittent thermal compounding device for thermal compounding of pole pieces according to an embodiment of the present invention;
FIG. 5 is a schematic illustration of a pole piece composited using the intermittent thermal compounding device of the pole piece of the embodiment of the present invention;
fig. 6 is a schematic diagram of a pole piece intermittent thermal compounding device for thermal compounding of pole pieces according to another embodiment of the present invention.
The following describes the embodiments of the present invention in further detail with reference to the drawings.
Detailed Description
In describing embodiments of the present invention in detail, the drawings showing the structure of the device are not to scale locally for ease of illustration, and the schematic illustrations are merely examples, which should not limit the scope of the invention. It should be noted that the drawings are in simplified form and are not to scale precisely, but rather are merely intended to facilitate and clearly illustrate the embodiments of the present invention. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance or implying the number of technical features indicated; the terms "forward," "reverse," "bottom," "upper," "lower," and the like are used for convenience in describing and simplifying the description only, and do not denote or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 and 2, the intermittent thermal compounding device for pole pieces of the present embodiment includes a frame 1, a thermal compression roller 2, a compensation roller 3, a backup roller 4, a thermal compression roller rotation driving mechanism 5, a compensation roller rotation driving mechanism 6, a thermal compression roller translation driving mechanism 7, and a thermal compression roller pressure control mechanism 8. The hot press roller 2, the compensation roller 3, the leaning roller 4, the hot press roller rotation driving mechanism 5, the compensation roller rotation driving mechanism 6, the hot press roller translation driving mechanism 7 and the hot press roller control mechanism 8 are all arranged on the frame 1.
The compensating roller 3 is arranged on the frame 1 through the compensating roller mounting bracket 3-1, the leaning roller 4 is arranged opposite to the compensating roller 3, the leaning roller 4 is fixed through the leaning roller mounting bracket 4-1, and the leaning roller 4 is pressed on the compensating roller 3. The compensating roller 3 is rotatable about its own axis by the compensating roller rotation driving mechanism 6. The compensating roller rotation driving mechanism 6 of the present embodiment includes a first rotation driving motor 6-1 and a first rotation driving mechanism 6-2, the first rotation driving mechanism 6-2 of the present embodiment includes a pair of transmission gears meshed with each other, one transmission gear is disposed on an output shaft of the rotation driving motor 6-1, the other transmission gear is disposed at an end portion of the compensating roller 3, and the first rotation driving motor 6-1 drives the compensating roller 3 to rotate through the transmission gears. The leaning roller 4 can also rotate around the self axis, but the leaning roller 4 does not need to be driven to rotate by a rotation driving mechanism, but follows the rotation along with the movement of the material belt. The leaning roller 4 is positioned behind the hot press roller 2 in the tape moving direction of the composite pole piece and the monopole piece, namely the material tape firstly passes through the hot press roller 2 and then passes through the leaning roller 4. The material belt refers to a composite pole piece, a single pole piece and an integral composite piece.
The thermo-compression roller 2 of this embodiment is horizontally movable on the frame 1 by the thermo-compression roller carriage 2-1, and the thermo-compression roller 2 can be close to and pressed against the compensation roller 3 or be separated from the compensation roller 3 when moving horizontally. The hot press roller 2 can rotate around the axis of the hot press roller by the drive of the hot press roller rotation driving mechanism 5. The hot press roller rotation driving mechanism 5 of the embodiment includes a second rotation driving motor 5-1 and a second rotation transmission mechanism 5-2, the second rotation transmission mechanism 5-2 of the embodiment is a coupling, and an output shaft of the first rotation driving motor 5-1 is connected with an end portion of the hot press roller 2 through the coupling, so as to drive the hot press roller 2 to rotate. In this embodiment, the rack 1 is provided with the sliding rail 1-1, and the hot-pressing roller carriage 2-1 is arranged on the sliding rail 1-1 and can move along the sliding rail 1-1 under the driving of the hot-pressing roller translation driving mechanism 7, so as to be close to the compensating roller 3 or far from the compensating roller 3. The hot-pressing roller translation driving mechanism 7 of the embodiment adopts a motor, and the motor drives the translation of the hot-pressing roller carriage 2-1 through a screw rod transmission structure.
The hot-press roller pressure control mechanism 8 is arranged on the hot-press roller sliding frame 2-1 and is used for adjusting the pressure of the hot-press roller 2 on the compensation roller 3. The hot press roller pressure control mechanism 8 of the present embodiment employs a pressure cylinder. When the pressure of the hot pressing roller 2 on the compensating roller 3 is large enough, the composite pole piece and the monopole piece can be thermally compounded together. The composite pole piece can be formed by combining a diaphragm, a negative pole piece and a diaphragm, or can be formed by combining a diaphragm, a positive pole piece and a diaphragm. When the composite pole piece is a composite structure of a diaphragm, a negative pole piece and a diaphragm, the single pole piece is a positive pole piece, and when the composite pole piece is a composite structure of a diaphragm, a positive pole piece and a diaphragm, the single pole piece is a negative pole piece.
As shown in fig. 3, the compensation roller 3 of the present embodiment is internally provided with a compensation roller heating rod 9, and the compensation roller heating rod 9 is provided along the axis of the compensation roller 3. The compensating roller heating rod 9 rotates together with the compensating roller 3, so that heating efficiency can be improved. One end of the compensation roller 3 is provided with an electric slip ring 10, and the compensation roller heating rod 9 is connected with an external power supply through the electric slip ring 10.
The inside hot pressing roller 2 is provided with hot pressing roller heating rod 11, and hot pressing roller heating rod 11 sets up along the axis of hot pressing roller 2. The heat roller heating rod 11 rotates together with the heat roller 2, so that heating efficiency can be improved. One end of the hot press roller 2 is provided with an electric slip ring 10, and the hot press roller heating rod 11 is connected with an external power supply through the electric slip ring 10. The heat press roller 2 of the embodiment is connected with the output shaft of the first rotary driving motor 5-1 through a transmission shaft 12, the output shaft of the first rotary driving motor 5-1 is connected with the transmission shaft 12 through a coupling, and the transmission shaft 12 is connected with one end of the heat press roller 2 through a one-way bearing 13. The hot pressing roller 2 of the embodiment adopts a way of connecting and driving the unidirectional bearing 13, so that the surface linear velocity of the hot pressing roller 2 is close to and smaller than the surface linear velocity of the compensating roller 3, and the pole piece cannot be damaged due to inconsistent surface linear velocities of the hot pressing roller 2 and the compensating roller 3 when the hot pressing roller 2 presses the compensating roller.
In the hot press lamination, the hot press roller 2 is pressed against the compensation roller 3, and if the surface linear speeds of the two rollers are not uniform, the pole piece sandwiched between the two rollers is damaged. If the hot pressing roller is a driven roller, namely the hot pressing roller does not have a rotary driving unit to drive and rotate, but follows the compensating roller to rotate, the hot pressing roller is driven to rotate by the compensating roller when contacting the compensating roller, and the rotating speed of the hot pressing roller can obviously drop when the hot pressing roller leaves the compensating roller, so that the surface linear speed of the hot pressing roller and the surface linear speed of the compensating roller have larger difference, and the hot pressing roller can damage a polar plate due to larger difference of the surface linear speeds between the two rollers when being pressed on the compensating roller again.
If the hot pressing roller and the compensation roller are driven to rotate by the independent rotary driving unit, compared with the structure that the hot pressing roller is a driven roller, the hot pressing roller can rotate at a set rotation speed due to being driven by the rotary driving unit, the surface linear speed of the compensation roller can be more similar, and the damage to the polar plate caused by inconsistent surface linear speeds is reduced to a certain extent. However, the rotation direction of the hot pressing roller may be affected when the hot pressing roller contacts with the compensating roller, so that the surface linear speed of the hot pressing roller is changed (faster or slower), and therefore, the surface linear speed of the hot pressing roller and the surface linear speed of the compensating roller are still difficult to keep consistent, and the pole piece is damaged.
The method of connecting and driving the unidirectional bearing is adopted in the embodiment, the rotary driving unit drives the hot pressing roller to rotate, the hot pressing roller can only rotate towards one direction, the rotating speed of the hot pressing roller is set to be slightly lower than the rotating speed of the compensating roller, for example, the rotating speed of the hot pressing roller is 1-2% lower than the rotating speed of the compensating roller, when the hot pressing roller contacts with the compensating roller, the speed of the hot pressing roller can be driven by the compensating roller to be improved under the action of the unidirectional bearing, and therefore the speed of the hot pressing roller is kept consistent with the surface linear speed of the compensating roller, and the effect of avoiding damage to pole pieces caused by inconsistent surface linear speeds is achieved.
The method of pole piece thermal compounding using the pole piece intermittent thermal compounding device of this embodiment will be described below with reference to fig. 4.
As shown in fig. 4, when the pole pieces are thermally compounded, the unreeled composite pole piece 101 and the monopole piece 102 are wound on the compensation roller 3 for tape feeding, the monopole piece 102 in the embodiment is a positive pole piece, and the composite pole piece 101 is a composite pole piece with a diaphragm (101 b) -negative pole piece (101 a) -diaphragm (101 b) structure (fig. 5); the monopole sheet 102 is positioned at the outer side during winding, the composite pole sheet 101 is positioned at the inner side, namely the composite pole sheet 101 is wound on the surface of the compensation roller 3, the single pole sheet 102 is overlapped on the composite pole sheet 101, and the single pole sheet 102 is more outer than the composite pole sheet 101; when in winding, the winding angle of the composite pole piece 101 and the single pole piece 102 on the compensation roller 3 is 180 degrees, namely, the composite pole piece 101 and the single pole piece 102 wrap the half peripheral surface of the compensation roller 3, and the half circumference of the compensation roller 3 is arranged between the thermal composite position of the composite pole piece 101 and the single pole piece 102 and the position of the whole composite piece leaving the compensation roller 3;
the hot press roller 2 and the compensation roller 3 rotate around respective axes according to respective set speeds, the roller 4 presses the compensation roller 3, the composite pole piece 101 and the monopole piece 102 move from the position between the hot press roller 2 and the compensation roller 3 to the position between the roller 4 and the compensation roller 3, and the compensation roller 3 drives the whole composite piece after hot pressing to be driven backwards when rotating;
after the composite pole piece 101 and the monopole piece 102 are wound on the compensation roller 3 in a tape feeding way, the hot-pressing roller translation driving mechanism controls the hot-pressing roller 2 to approach and press the compensation roller 3 so as to carry out hot compounding on the composite pole piece 101 and the monopole piece 102, the pressure of the hot-pressing roller 2 on the compensation roller 3 can be regulated by the hot-pressing roller pressure control mechanism, the area in a dotted line frame in fig. 4 is a hot compounding area A, the composite pole piece 101 and the monopole piece 102 at the position are compounded together under the action of the hot-pressing roller 2, and the area between the hot compounding areas A is an unheated compounding area; the thermal composite pressure threshold is an empirical value and is correspondingly set according to the pole piece material;
after the hot pressing compounding is completed, the hot pressing roller translation driving mechanism controls the hot pressing roller 2 to retreat and leave the compensating roller 3; the compensation roller 3 rotates to drive the whole composite sheet obtained after hot pressing backwards, the composite pole piece 101 and the monopole sheet 102 continue to be carried backwards, after a certain distance of carrying, the hot pressing roller translation driving mechanism controls the hot pressing roller 2 to approach and press the compensation roller 3 to thermally compound the composite pole piece 101 and the monopole sheet 102, then the hot pressing roller 2 leaves the compensation roller 3, the process is repeated, and the thermal compounding operation is carried out on the composite pole piece 101 and the monopole sheet 102.
The intermittent thermal compounding device of the present embodiment realizes intermittent thermal compounding by controlling the hot-pressing roller to execute the actions of pressing the compensation roller at set time intervals and causing the pressure pressed against the compensation roller to reach the thermal compounding pressure threshold-and the compensation roller to separate (the pressure pressed against the compensation roller is smaller than the thermal compounding pressure threshold) -pressing the compensation roller and causing the pressure pressed against the compensation roller to reach the thermal compounding pressure threshold; when the hot press roller and the compensation roller are separated, the monopole sheet 102 and the composite pole piece 101 are not compounded together, and as the monopole sheet 102 is positioned at the outer side of the composite pole piece 101, as shown in fig. 5, the length of the monopole sheet 102 in an unheated composite area is larger than that of the composite pole piece 101, so that the compensation of the length of an inner pole piece and an outer pole piece (the inner layer is the composite pole piece and the outer layer is the monopole piece) is realized, and when the integral composite sheet obtained by thermally compounding the monopole sheet and the composite pole piece is wound on winding equipment through a winding needle, the phenomenon that the inner pole piece and the outer pole piece of an electric core are wrinkled due to the consistent length of an inner material belt and an outer material belt can be avoided, and the effect of improving the quality of the electric core is achieved.
As another embodiment of the present invention, the thermo-compression roller may be directly pressed against the compensation roller instead of being translated, that is, unlike the foregoing embodiment, the thermo-compression roller translation driving mechanism is not provided (that is, there is no movement of the thermo-compression roller approaching and pressing against and away from the compensation roller), but the pressure of the thermo-compression roller against the compensation roller is controlled by the thermo-compression roller pressure control mechanism, and the thermo-compression roller pressure control mechanism adjusts the pressure of the thermo-compression roller against the compensation roller according to a set time to a pressure reaching the thermal composite pressure threshold, or to a pressure less than the thermal composite pressure threshold, and when the pressure of the thermo-compression roller against the compensation roller is less than the thermal composite pressure threshold, the composite pole piece and the monopole piece cannot be composited. The method for carrying out pole piece thermal compounding by adopting the pole piece intermittent thermal compounding device comprises the following steps:
as shown in fig. 6, when the pole pieces are thermally compounded, the unreeled monopole piece 102 and the compound pole piece 101 are wound on the compensation roller 3 for tape feeding, the monopole piece 102 is positioned at the outer side during winding, the compound pole piece 101 is positioned at the inner side during winding, the winding angle of the compound pole piece 101 and the monopole piece 102 is smaller than 180 degrees, namely, the compensation roller 3 is wrapped by the compound pole piece 101 and the monopole piece 102, the outer circumferential surface is less than half, and the thermal compounding position of the compound pole piece 101 and the single pole piece 102 and the position of the integral compound piece leaving the compensation roller 3 are less than half of the circumference of the compensation roller 3;
the hot-pressing roller 2 and the compensating roller 3 rotate around the respective axes according to the respective set speeds, the hot-pressing roller 2 and the leaning roller 4 are uniformly pressed on the compensating roller 3, the composite pole piece 101 and the monopole piece 102 are in tape feeding between the hot-pressing roller 2 and the compensating roller 3 and between the leaning roller 4 and the compensating roller 3, and the compensating roller 3 drives the whole hot-pressed pole piece to be driven backwards during rotation;
after the composite pole piece 101 and the monopole piece 102 are wound on the compensation roller 3 in a travelling process, the hot-pressing roller pressure control mechanism adjusts the pressure of the hot-pressing roller 2 on the compensation roller 3 to enable the pressure of the hot-pressing roller 2 on the compensation roller 3 to reach a hot composite pressure threshold, the composite pole piece 101 and the monopole piece 102 are composited together, and after the hot-pressing compositing is completed, the hot-pressing roller pressure control mechanism adjusts the pressure of the hot-pressing roller 2 on the compensation roller 3 to enable the pressure of the hot-pressing roller 2 on the compensation roller 3 to be smaller than a hot composite pressure threshold, and at the moment, the composite pole piece 101 and the monopole piece 102 between the hot-pressing roller 2 and the compensation roller 3 cannot be composited together due to small pressure;
the whole composite sheet obtained after the hot pressing is driven backwards by the rotation of the compensation roller 3, the composite pole piece 101 and the monopole sheet 102 continue to be carried backwards, after a certain distance of carrying, the hot-pressing roller pressure control mechanism adjusts the pressure of the hot-pressing roller 2 on the compensation roller 3 to reach a hot composite pressure threshold value, the composite pole piece 101 and the monopole sheet 102 are subjected to hot compounding, then the pressure of the hot-pressing roller 2 on the compensation roller 3 is adjusted to be smaller than the hot composite pressure threshold value, and the above processes are repeated, so that the composite pole piece 101 and the monopole sheet 102 are subjected to hot compounding.
The intermittent thermal compounding device of the embodiment realizes intermittent thermal compounding by controlling the hot-pressing roller to execute the actions that the pressure on the compensation roller reaches a thermal compounding pressure threshold value, the pressure on the compensation roller is smaller than the thermal compounding pressure threshold value, the pressure on the compensation roller reaches the thermal compounding pressure threshold value, and the compound pole piece and the monopole piece are thermally compounded when the pressure on the compensation roller is large, and the compound pole piece and the monopole piece cannot be compounded when the pressure on the compensation roller is small. The time when the pressure on the compensation roller is smaller than the thermal compounding pressure threshold value can be set to be the time when the compensation roller rotates 180 degrees, and the single pole piece and the compound pole piece pass through the compensation roller within the time, but cannot be compounded due to the fact that the pressure is too small, and therefore the length compensation of the inner pole piece and the outer pole piece is achieved.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The intermittent thermal compounding device for the pole piece is characterized by being used for thermally compounding the compound pole piece and the monopole piece and comprising the following components:
the machine frame is provided with a compensation roller, a hot pressing roller and a leaning roller, wherein the compensation roller can rotate around the axis of the machine frame under the drive of a compensation roller rotation driving mechanism, and the hot pressing roller can rotate around the axis of the machine frame under the drive of the hot pressing roller rotation driving mechanism;
the leaning roll is arranged behind the hot pressing roll in the feeding belt direction, and the leaning roll is driven to rotate when the feeding belt is fed;
the hot-pressing roller can press the compensation roller, the pressure of the hot-pressing roller on the compensation roller is regulated by a hot-pressing roller pressure control mechanism, when the pressure of the hot-pressing roller on the compensation roller reaches a hot-compounding pressure threshold, the compound pole piece and the monopole piece are thermally compounded together, and the hot-pressing roller executes the actions that the pressure on the compensation roller reaches the hot-compounding pressure threshold-the pressure on the compensation roller is smaller than the hot-compounding pressure threshold-the pressure on the compensation roller reaches the hot-compounding pressure threshold according to a set time interval, so that intermittent hot compounding of the compound pole piece and the monopole piece is realized.
2. The pole piece intermittent thermal compounding device of claim 1, wherein: the rack is provided with a translatable hot-pressing roller carriage, and the hot-pressing roller is arranged on the hot-pressing roller carriage;
the hot-pressing roller carriage translates under the control of the hot-pressing roller translation driving mechanism, and can drive the hot-pressing roller to approach and press the compensation roller or leave the compensation roller.
3. The pole piece intermittent thermal compounding device of claim 1, wherein: the hot press roller rotation driving unit comprises a second rotation driving motor, an output shaft of the second rotation driving motor is connected with a transmission shaft through a coupler, and the transmission shaft is connected with one end of the hot press roller through a one-way bearing.
4. A pole piece intermittent thermal compounding device as in claim 3, wherein: the rotating speed of the hot pressing roller is lower than that of the compensating roller.
5. The pole piece intermittent thermal compounding device of claim 1, wherein: the hot-pressing roller pressure control mechanism is a pressure cylinder.
6. The pole piece intermittent thermal compounding device of claim 1, wherein: the compensating roller is internally provided with a compensating roller heating rod which is arranged along the axis of the compensating roller and rotates along with the compensating roller;
and/or a hot-press roller heating rod is arranged in the hot-press roller, and the hot-press roller heating rod is arranged along the axis of the hot-press roller and rotates along with the hot-press roller.
7. A pole piece thermal compounding method using the pole piece intermittent thermal compounding device of claim 1 or 3 or 4 or 5 or 6, characterized by comprising the steps of:
winding a composite pole piece and a monopole piece on the compensation roller, wherein the composite pole piece is positioned at the inner side, and the monopole piece is positioned at the outer side;
the hot-pressing roller and the compensating roller rotate around respective axes according to set speed, the hot-pressing roller and the leaning roller are uniformly pressed on the compensating roller, the composite pole piece and the monopole piece are fed from between the hot-pressing roller and the compensating roller and between the leaning roller and the compensating roller, and the compensating roller drives the whole composite piece after hot-pressing to be driven backwards when rotating;
in the tape feeding process, the hot-pressing roller pressure control mechanism adjusts the pressure of the hot-pressing roller on the compensation roller, the action that the pressure of the hot-pressing roller on the compensation roller reaches a thermal compounding pressure threshold value, namely that the pressure of the hot-pressing roller on the compensation roller is smaller than the thermal compounding pressure threshold value, is repeatedly executed according to a set time interval, the compound pole piece and the monopole piece are compounded together when the pressure of the hot-pressing roller on the compensation roller reaches the thermal compounding pressure threshold value, and the compound pole piece and the monopole piece cannot be compounded when the pressure of the hot-pressing roller on the compensation roller is smaller than the thermal compounding pressure threshold value, so that intermittent thermal compounding of the compound pole piece and the monopole piece is realized.
8. The pole piece thermal compounding method of claim 7, wherein: the winding angle of the composite pole piece and the monopole piece on the compensation roller is smaller than 180 degrees.
9. A pole piece thermal compounding method using the pole piece intermittent thermal compounding device of any one of claims 2 to 6, characterized by comprising the steps of:
winding a composite pole piece and a monopole piece on the compensation roller, wherein the composite pole piece is positioned at the inner side, and the monopole piece is positioned at the outer side;
the hot-press roller and the compensation roller rotate around respective axes according to set speed, the leaning roller is pressed on the compensation roller, the composite pole piece and the monopole piece are taken away from between the hot-press roller and the compensation roller and between the leaning roller and the compensation roller, and the compensation roller drives the whole composite piece after hot-pressing to be driven backwards when rotating;
in the process of tape feeding, the hot-pressing roller translation driving mechanism controls the hot-pressing roller to approach and press the compensation roller, so that the pressure of the hot-pressing roller on the compensation roller reaches a thermal composite pressure threshold value, and the composite pole piece and the monopole piece are composited together;
after thermal compounding is completed, the hot-pressing roller translation driving mechanism controls the hot-pressing roller to leave the compensation roller, the composite pole piece and the single pole piece continue to be carried out, and the hot-pressing roller translation driving mechanism controls the hot-pressing roller to be pressed on the compensation roller according to a set time interval to thermally compound the composite pole piece and the single pole piece or leave the compensation roller, so that intermittent thermal compounding of the composite pole piece and the single pole piece is realized.
10. A pole piece thermal compounding method as defined in claim 9, wherein: the winding angle of the composite pole piece and the monopole piece on the compensation roller is 180 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311644786.6A CN117594739A (en) | 2023-12-01 | 2023-12-01 | Intermittent thermal compounding device and method for pole pieces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311644786.6A CN117594739A (en) | 2023-12-01 | 2023-12-01 | Intermittent thermal compounding device and method for pole pieces |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117594739A true CN117594739A (en) | 2024-02-23 |
Family
ID=89913122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311644786.6A Pending CN117594739A (en) | 2023-12-01 | 2023-12-01 | Intermittent thermal compounding device and method for pole pieces |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117594739A (en) |
-
2023
- 2023-12-01 CN CN202311644786.6A patent/CN117594739A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP4095953A1 (en) | Laminating device | |
| CN110212232A (en) | Lithium battery compounding machine, hot pressing composite system and its complex method | |
| CN111193041B (en) | Laminating equipment | |
| CN115602782A (en) | Battery sheet dry process coating pressing equipment | |
| CN112586530A (en) | Dough sheet making equipment | |
| CN117594739A (en) | Intermittent thermal compounding device and method for pole pieces | |
| CN109968652B (en) | Online pad pasting device | |
| CN212381485U (en) | Hot rolling film machine equipment | |
| CN210759303U (en) | Hot pressing device | |
| CN214086829U (en) | Heating laminating machine | |
| CN212446400U (en) | High-pressure hot covering machine | |
| CN116748294A (en) | Steel strip rolling mill | |
| JP7284471B1 (en) | Sheet material winding device, sheet material unwinding device, and sheet material winding method by sheet material winding device | |
| CN219633855U (en) | Continuous fixed length cutting machine for plastic strapping tape | |
| CN210083642U (en) | Aluminum sheet laminating machine | |
| CN210011328U (en) | Online pad pasting device | |
| CN117790870A (en) | Thermal composite winding machine and battery core winding method | |
| CN212422535U (en) | Printing packaging box film laminating device | |
| CN214257804U (en) | Dough sheet making equipment | |
| CN211455840U (en) | Laminating equipment | |
| CN211334622U (en) | Thermoplastic film compounding machine | |
| CN219771246U (en) | Magnetic drive type composite device | |
| CN219873625U (en) | Multi-material-belt compressing assembly, processing mechanism and battery core winding equipment | |
| CN209912971U (en) | Lithium battery compound machine, hot-pressing compound system and press-fitting device | |
| JPH11102697A (en) | Manufacturing apparatus of electrode element for lithium polymer battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |