CN117790870A - Thermal composite winding machine and battery core winding method - Google Patents
Thermal composite winding machine and battery core winding method Download PDFInfo
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- CN117790870A CN117790870A CN202311863523.4A CN202311863523A CN117790870A CN 117790870 A CN117790870 A CN 117790870A CN 202311863523 A CN202311863523 A CN 202311863523A CN 117790870 A CN117790870 A CN 117790870A
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- 238000004804 winding Methods 0.000 title claims abstract description 103
- 239000002131 composite material Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000007246 mechanism Effects 0.000 claims abstract description 149
- 238000013329 compounding Methods 0.000 claims abstract description 114
- 239000000463 material Substances 0.000 claims abstract description 42
- 150000001875 compounds Chemical class 0.000 claims abstract description 33
- 238000012546 transfer Methods 0.000 claims abstract description 5
- 238000007731 hot pressing Methods 0.000 claims description 104
- 238000005520 cutting process Methods 0.000 claims description 31
- 230000008569 process Effects 0.000 claims description 14
- 238000013459 approach Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000002390 adhesive tape Substances 0.000 claims description 4
- 241001131688 Coracias garrulus Species 0.000 description 331
- 230000001276 controlling effect Effects 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 7
- 238000012937 correction Methods 0.000 description 4
- 238000013519 translation Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005404 monopole Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
A thermal compound winding machine and a battery core winding method, wherein the thermal compound winding machine comprises: the device comprises a first pole piece unreeling mechanism, a second pole piece unreeling mechanism, a first diaphragm unreeling mechanism, a second diaphragm unreeling mechanism, an intermittent thermal compounding mechanism, a traction mechanism and a winding head, wherein the intermittent thermal compounding mechanism, the traction mechanism and the winding head are sequentially arranged along the transfer direction of an unreeled material belt; the intermittent thermal compounding mechanism is used for carrying out intermittent thermal compounding on the pole pieces and the diaphragms which are laminated together to form compound pole pieces in which a thermal compounding area and an uncomplexed area are alternately arranged in sequence; the traction mechanism is used for traction of the composite pole piece; the winding head is provided with a winding needle for winding the composite pole piece into an electric core. According to the invention, an intermittent thermal compounding mode is adopted for the pole pieces and the diaphragm, so that the composite pole pieces with inconsistent lengths of the inner material belt and the outer material belt are formed, the position accuracy of the positive pole lug and the negative pole lug of the composite pole pieces is easier to control, the alignment degree of the positive pole piece and the negative pole piece is better, the problem that the head of a conventional winding mode is uncontrolled or the tail is thrown is avoided, the winding alignment degree is better, and the winding accuracy is improved.
Description
Technical Field
The invention belongs to the technical field of lithium battery manufacturing, and particularly relates to a thermal composite winding machine of a lithium ion battery core and a battery core winding method.
Background
The square lithium battery cell is mainly prepared by two processes of winding and lamination. The 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 to unwind the positive and negative electrode plates to the winding needle for winding, the position of the electrode lug on the electrode plate relative to the winding needle is not easy to control, and the position precision of the produced positive and negative electrode lugs of the battery core is low; and because the quantity of the coiled material strips is more, the head and the tail of the pole pieces are not controlled by a correction mechanism, the precision of the coiling alignment degree of the positive pole piece and the negative pole piece is low, meanwhile, because of the existence of the tension of the diaphragm, the coiled battery core is easy to S-shaped, the coiling precision is difficult to ensure, and the quality of the battery core can be influenced if the coiling precision is low. In addition, as the positive electrode plate, the negative electrode plate and the diaphragm electrode plate are required to be respectively fed into the winding needle for winding, the auxiliary action of the mechanism is more, and the production efficiency of the equipment is affected.
Disclosure of Invention
The invention aims to provide a thermal compound winding machine and a battery cell winding method, wherein the winding precision is high, and the quality of a battery cell can be improved.
In order to achieve the above object, the present invention adopts the following technical solutions:
a thermal compounding winder, comprising: the device comprises a first pole piece unreeling mechanism, a second pole piece unreeling mechanism, a first diaphragm unreeling mechanism, a second diaphragm unreeling mechanism, an intermittent thermal compounding mechanism, a traction mechanism and a winding head, wherein the intermittent thermal compounding mechanism, the traction mechanism and the winding head are sequentially arranged along the transfer direction of an unreeled material belt; the intermittent thermal compounding mechanism is used for carrying out intermittent thermal compounding on the pole pieces and the diaphragms which are laminated together to form compound pole pieces in which a thermal compounding area and an uncomplexed area are alternately arranged in sequence; the traction mechanism is used for traction of the composite pole piece; the winding head is provided with a winding needle for winding the composite pole piece into an electric core.
The intermittent thermal compounding mechanism comprises a thermal compression roller and a compensation roller which are oppositely arranged, wherein the compensation roller and the thermal compression roller can rotate around the axis of the thermal compounding mechanism; the hot-pressing roller can press the compensation roller, the pole piece and the diaphragm are thermally compounded together when the pressure of the hot-pressing roller on the compensation roller reaches a thermal compounding pressure threshold, 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 and the pressure on the compensation roller reaches the thermal compounding pressure threshold according to a set time interval, and intermittent thermal compounding of the pole piece and the diaphragm is realized.
The thermal compound winder as described above, optionally, the heated platen roller may translate to approach and press against the compensation roller, or to leave the compensation roller.
The thermal compound winder as described above, optionally, further comprises a hot press roll pressure control mechanism for controlling the pressure of the hot press roll against the compensation roll.
The hot-pressing roller and the compensating roller are both driving rollers, the hot-pressing roller is driven to rotate by a rotary driving motor, an output shaft of the rotary driving motor is connected with a transmission shaft by a coupler, and the transmission shaft is connected with a rotating shaft of the hot-pressing roller by a one-way bearing; the rotating speed of the hot pressing roller is lower than that of the compensating roller.
The thermal compound winding machine as described above, optionally, the traction mechanism includes a first traction roller and a second traction roller that are disposed opposite to each other, where the first traction roller and the second traction roller can both rotate around their own axes, the first traction roller is a driving roller, and the second traction roller is a driven roller; the second traction roller comprises a main shaft, a roller frame arranged on the main shaft, a roller shaft arranged on the roller frame and a roller arranged on the roller shaft; the roller frame can rotate around the axis of the main shaft, the roller shafts are positioned at the periphery of the main shaft, a plurality of roller shafts are arranged at intervals along the circumferential direction, the roller shafts can rotate around the axis of the roller shafts, intervals exist between the adjacent roller shafts in the circumferential direction, and when the second traction roller is pressed on the first traction roller, at least one roller shaft is pressed on the first traction roller.
The thermal compound winding machine as described above, optionally, a plurality of passing rollers are arranged on the material belt moving path between the traction mechanism and the winding head, the passing rollers comprise a pattern roller, and the pattern roller comprises a main roller shaft and a plurality of rotary roller shafts arranged at the periphery of the main roller shaft along the circumference at intervals; the utility model discloses a roller, including main roller, rotatory roller support, rotatory roller support is provided with the both ends of main roller, rotatory roller support can wind the main roller rotates, rotatory roller set up in on the rotatory roller support.
The invention also provides a battery core winding method using the thermal compound winding machine, which comprises the following steps:
the first pole piece unreeling mechanism, the second pole piece unreeling mechanism, the first diaphragm unreeling mechanism and the second diaphragm unreeling mechanism unreels a first pole piece, a second pole piece, a first diaphragm and a second diaphragm respectively; the first pole piece unreeling mechanism comprises a pole piece feeding clamp and a pole piece cutter which are sequentially arranged, and the pole piece feeding clamp and the pole piece cutter carry out tracking and cutting on the first pole piece; the second pole piece unreeling mechanism comprises a cutting and separating rubberizing mechanism, the cutting and separating rubberizing mechanism is used for connecting the cut material strips through an adhesive tape after cutting the second pole piece, and when the second pole piece passes through the cutting and separating rubberizing mechanism, cutting and rubberizing connection operations are carried out at the cutting and separating rubberizing mechanism to form a pole piece discontinuous and material strip continuous piece;
the first pole piece, the second pole piece, the first diaphragm and the second diaphragm are stacked in sequence, intermittent thermal compounding is carried out at the intermittent thermal compounding mechanism to obtain a compound pole piece, the first pole piece is located at the outermost side during thermal compounding, the compound pole piece with a wavy surface is obtained through thermal compounding, and the length of the first pole piece is larger than that of the second pole piece, the first diaphragm and the second diaphragm;
the traction mechanism is used for traction of the composite pole piece;
the composite pole piece is wound into an electric core at the winding head.
In the foregoing method for winding the battery cell, optionally, when the intermittent thermal compounding mechanism performs thermal compounding on the pole piece and the diaphragm,
winding the unreeled pole piece and the diaphragm on the compensation roller, wherein the first pole piece is positioned at the outer side;
the hot-pressing roller and the compensation roller rotate around respective axes according to set speeds, and the pole piece and the diaphragm are taken between the hot-pressing roller and the compensation roller;
controlling the hot-pressing roller to approach and press the compensation roller to thermally compound the pole piece and the diaphragm, then controlling the hot-pressing roller to leave the compensation roller, wherein the pole piece and the diaphragm cannot be compounded together, driving the composite piece obtained after hot-pressing to backward by the rotation of the compensation roller, after a certain distance of tape, controlling the hot-pressing roller to approach and press the compensation roller again, thermally compounding the pole piece and the diaphragm again, then controlling the hot-pressing roller to leave the compensation roller again, repeating the above processes, and performing intermittent thermal compounding operation on the pole piece and the diaphragm;
or winding the unreeled pole piece and the diaphragm on the compensation roller, wherein the first pole piece is positioned at the outer side;
the hot-pressing roller and the compensation roller rotate around respective axes according to set speeds, the hot-pressing roller is pressed on the compensation roller, and the pole piece and the diaphragm are taken from between the hot-pressing roller and the compensation roller;
controlling the pressure of the hot-pressing roller on the compensation roller to enable the pressure of the hot-pressing roller on the compensation roller to reach a thermal composite pressure threshold, thermally compositing the pole piece and the diaphragm, and then controlling the pressure of the hot-pressing roller on the compensation roller to enable the pressure of the hot-pressing roller on the compensation roller to be smaller than the thermal composite pressure threshold, wherein the pole piece and the diaphragm cannot be composited together;
and the compensation roller rotates to drive the composite sheet obtained after hot pressing backwards, after a certain distance of tape is taken, the pressure of the hot pressing roller on the compensation roller is controlled to reach a thermal composite pressure threshold value again, the pole piece and the diaphragm are subjected to thermal composite, then the process is repeated when the pressure of the hot pressing roller on the compensation roller is controlled to be smaller than the thermal composite pressure threshold value, and the pole piece and the diaphragm are subjected to thermal composite operation.
According to the battery core winding method, optionally, the composite pole piece is taken from the first traction roller to the first traction roller, the first pole piece is opposite to the second traction roller, and when the second traction roller is pressed on the first traction roller, the roller is always pressed on the first traction roller and is contacted with the first pole piece;
and/or when the composite pole piece bypasses the roller, the side where the first pole piece is positioned is contacted with the rotary roller shaft.
According to the technical scheme, the intermittent thermal compounding mechanism is arranged in the thermal compounding winder, the pole pieces and the diaphragm can be subjected to intermittent thermal compounding according to the set time interval, so that the composite pole pieces with inconsistent lengths of the inner layer and the outer layer of the pole pieces are formed, and the length difference of the inner layer and the outer layer of the pole pieces is consistent with the length difference of the inner layer and the outer layer of the pole pieces required by winding a winding needle, so that the problem of wrinkling of the inner layer of the pole pieces when the composite pole pieces are wound into the battery cells is solved, the position precision of positive and negative lugs of the formed composite pole pieces is easier to control, the alignment degree of the positive and negative pole pieces is better, and the winding precision is improved. The winding head with three winding needle stations can finish the actions of changing the stations, clamping the composite pole pieces by the winding needles, cutting off the composite pole pieces, starting the actions of winding a new battery cell, and the like through a continuous winding mode, and the winding is not stopped, so that the efficiency is higher. The composite pole piece is of an integral structure, so that the problem that the head of a conventional winding mode is not controlled or the tail is thrown is solved; the winding alignment degree is better, in the winding process, the pole piece is mainly stressed by tension, the diaphragm basically has no tension, and the problems of S-shaped battery cell and the like in a conventional winding mode can be solved.
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 view of a thermal compound winder according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of an embodiment of the present invention after cutting and separating the pole piece;
FIG. 3 is a schematic illustration of a composite pole piece after thermal compounding of the pole piece and separator according to an embodiment of the present invention;
FIG. 4 is a schematic view showing the structures of a thermo roll and a compensation roll according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a traction mechanism according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a second pulling roll according to an embodiment of the present invention;
fig. 7 is a schematic view of a roller structure according to an 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, the thermal compound winding machine of the present embodiment includes a first pole piece unreeling mechanism 1, a second pole piece unreeling mechanism 2, a first diaphragm unreeling mechanism 3, a second diaphragm unreeling mechanism 4, an intermittent thermal compound mechanism 5, a traction mechanism 6, and a winding head 7. The pole piece/diaphragm unreeling mechanism is used for unreeling the pole piece/diaphragm material belt, the traction mechanism 6 is used for realizing traction movement of the material belt, so that the material belt moves to the intermittent thermal compounding mechanism 5 for thermal compounding, and moves to the winding head 7 for winding. The polarity of the first pole piece is opposite to that of the second pole piece, and the first pole piece is taken as a positive pole piece and the second pole piece is taken as a negative pole piece for illustration in the embodiment.
The first pole piece unreeling mechanism 1 comprises a first material roll mounting shaft (not shown), a first pole piece tension control mechanism 1-1, a pole piece feeding clamp 1-2, a pole piece cutter 1-3 and a first pole piece deviation correcting mechanism 1-4. The positive plate coil 101 is mounted on a first coil mounting shaft which can rotate around the axis of the first coil mounting shaft, so that unreeling of the material belt is realized. The first pole piece tension control mechanism 1-1, the pole piece feeding clamp 1-2, the pole piece cutter 1-3 and the first pole piece deviation rectifying mechanism 1-4 are sequentially arranged along the moving direction of the first pole piece, the first pole piece tension control mechanism 1-1 is used for controlling the tension of the pole piece in the traction and transfer process, the pole piece feeding clamp 1-2 is used for feeding the pole piece forwards, the pole piece cutter 1-3 is used for cutting off the first pole piece, and the first pole piece deviation rectifying mechanism 1-4 is used for rectifying the pole piece. The correction mechanism generally includes a correction nip roll and a correction roll. The tension control mechanism and the deviation correcting mechanism of the invention are both conventional tension control structures and deviation correcting structures on the existing winding machine, and the tension control mechanism and the deviation correcting mechanism are not improved, and are not described in detail herein.
The second pole piece unreeling mechanism 2 comprises a second material roll mounting shaft (not shown), a cutting and separating rubberizing mechanism 2-1, a second pole piece tension control mechanism 2-2 and a first swing deviation rectifying mechanism 2-3. The negative plate roll 102 is mounted on a second roll mounting shaft that is rotatable about its own axis. The cutting and separating rubberizing mechanism 2-1 is used for cutting the unreeled material belt, then connecting the cut material belt by the adhesive tape, and the pole piece after rubberizing is shown in figure 2. After the negative electrode sheet 102 moves to the position where the cutting and separating rubberizing mechanism 2-1 is located, the negative electrode sheet 102 is firstly cut off by a cutter (not shown) of the cutting and separating rubberizing mechanism 2-1, then an adhesive tape is stuck on the cut-off position by the rubberizing mechanism (such as a rubberizing roller, a rubberizing mechanical arm and the like), and the cut negative electrode sheets 102 are connected together again. The cutting position of the pole piece is the length of the pole piece required by winding one cell, and the length of the obtained material belt is the length required by winding one cell after the material coil is cut off.
The first diaphragm unreeling mechanism 3 and the second diaphragm unreeling mechanism 4 have the same structure and comprise a diaphragm material reel mounting shaft (not shown) and a diaphragm tension control mechanism (not numbered), the diaphragm material reel is mounted on the diaphragm material reel mounting shaft, and unreeling of the diaphragm material belt is realized when the diaphragm material reel mounting shaft rotates around the axis of the diaphragm material reel mounting shaft. The first diaphragm material roll 103 is arranged on a diaphragm material roll installation shaft of the first diaphragm unreeling mechanism 3, the second diaphragm material roll 104 is arranged on a diaphragm material roll installation shaft of the first diaphragm unreeling mechanism 4,
after unreeling the material strip (pole piece/diaphragm), an intermittent thermal compounding mechanism 5, a traction mechanism 6 and a reeling head 7 are sequentially arranged in the transfer direction of the material strip. Before the first pole piece and the second pole piece are sent into the intermittent thermal compounding mechanism 5 for thermal compounding, a preheating mechanism can be arranged to preheat the first pole piece and the second pole piece, the diagonal line filling area in fig. 1 represents a preheating station of the first pole piece and the second pole piece, and the first pole piece and the second pole piece are preheated at the preheating station.
The first pole piece, the second pole piece, the first diaphragm, the second pole piece and the second diaphragm are stacked in the order of the first pole piece, the first diaphragm, the second pole piece and the second diaphragm and are sent to the intermittent thermal compounding mechanism 5 together for thermal compounding. The intermittent thermal compounding mechanism 5 is used for performing an intermittent thermal compounding operation on the pole piece and the diaphragm. The pole piece obtained by intermittent thermal compounding is provided with a thermal compounding area and an uncomplexed area, the pole piece and the diaphragm are compounded together in the thermal compounding area, and the pole piece and the diaphragm are not compounded together in the uncomplexed area. The thermal composite regions and the non-composite regions are alternately arranged in sequence, wherein one section of the thermal composite region is followed by the non-composite region, and one section of the non-composite region is followed by the thermal composite region, so that the thermal composite region is repeated.
As shown in fig. 4, the intermittent thermal compounding mechanism 5 of the present embodiment includes a heat pressing roller 5-1 and a compensating roller 5-2 which are disposed opposite to each other, and the heat pressing roller 5-1 and the compensating roller 5-2 are each rotatable about their own axes, respectively. The heat pressing roller 5-1 rotates around its own axis under the control of the heat pressing roller rotation driving unit 5-3, and the compensating roller 5-2 rotates around its own axis under the control of the compensating roller rotation driving unit (not shown). The heating devices are arranged inside the hot press roller 5-1 and the compensation roller 5-2, the heating devices in the embodiment are heating rods 5-4 arranged along the axes of the hot press roller/the compensation roller, and the heating rods 5-4 can rotate along with the hot press roller 5-1 or the compensation roller 5-2 respectively, so that the heating efficiency is improved. The heating rod 5-4 is connected with an external power supply through an electric slip ring 5-5 arranged at the end part of the heating roller and the compensating roller.
The heat press roller 5-1 of the present embodiment may approach or depart from the compensation roller 5-2 under the control of a heat press roller translation driving unit (not shown), and may thermally compound the pole piece/diaphragm located between the heat press roller 5-1 and the compensation roller 5-2 when the heat press roller 5-1 approaches and presses against the compensation roller 5-2, and may not thermally compound the pole piece/diaphragm located between the heat press roller 5-1 and the compensation roller 5-2 when the heat press roller 5-1 departs from the compensation roller 5-2. The hot press roller 5-1 is pressed against the compensation roller 5-2 at set time intervals, thereby intermittently thermally compounding the pole piece and the diaphragm together.
In the embodiment, the hot-pressing roller capable of translating is adopted to intermittently press the compensating roller to realize intermittent thermal compounding, and in other embodiments, the pressure of the hot-pressing roller on the compensating roller can be regulated by the hot-pressing roller pressure control mechanism to realize intermittent thermal compounding. For example, the hot press roller does not translate, but directly presses on the compensation roller, the hot press roller pressure on the compensation roller is controlled by the hot press roller pressure control mechanism, the hot press roller pressure on the compensation roller is regulated by the hot press roller pressure control mechanism according to the set time to reach the hot compounding pressure threshold value, or the pressure is smaller than the hot compounding pressure threshold value, when the pressure of the hot press roller on the compensation roller is smaller than the hot compounding pressure threshold value, the pole piece and the diaphragm cannot be compounded, and when the pressure of the hot press roller on the compensation roller is larger than the hot compounding pressure threshold value, the pole piece and the diaphragm are compounded together. The hot-pressing roller pressure control mechanism can adopt a pressure cylinder to control the hot-pressing roller to thermally compound the pole piece and the diaphragm together when the pressure of the hot-pressing roller on the compensation roller is large enough.
When the hot press is compounded, the hot press rolls on the compensation rolls, and if the surface linear speeds of the two rolls are inconsistent, the pole pieces clamped between the two rolls can be 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.
In order to avoid the damage to the pole pieces caused by inconsistent surface linear speeds of the two rolls of the hot-pressing roll and the compensating roll, preferably, the hot-pressing roll 5-1 of the embodiment adopts a way of connecting and driving the unidirectional bearing 5-6, the rotating shaft of the hot-pressing roll 5-1 is connected with the output shaft of the hot-pressing roll rotation driving unit 5-3 through the transmission shaft 5-7, namely, the output shaft of the hot-pressing roll rotation driving unit 5-3 is connected with the transmission shaft 5-7 through the coupling, and the transmission shaft 5-7 is connected with the rotating shaft of the hot-pressing roll 5-1 through the unidirectional bearing 5-6. In the way of connecting and driving the unidirectional bearing, the hot pressing roller rotary driving unit 5-3 drives the hot pressing roller 5-1 to rotate, the hot pressing roller 5-1 can only rotate in one direction, the rotating speed of the hot pressing roller 5-1 is set to be slightly lower than the rotating speed of the compensating roller 5-2, for example, the rotating speed of the hot pressing roller 5-1 is 1-2% lower than the rotating speed of the compensating roller, when the hot pressing roller 5-1 and the compensating roller 5-2 are contacted, under the action of the unidirectional bearing 5-6, the speed of the hot pressing roller 5-1 can be driven by the compensating roller 5-2 to be lifted, so that the surface linear speed of the hot pressing roller 5-1 is consistent with the surface linear speed of the compensating roller 5-2, and the effect of pole pieces damage caused by inconsistent surface linear speeds of the hot pressing roller 5-1 and the compensating roller is avoided.
The intermittent thermal compounding mechanism of the embodiment performs the following steps of pole piece/diaphragm thermal compounding:
during thermal compounding, the unreeled pole piece and the diaphragm are wound on the compensation roller 5-2 for tape feeding, and the first pole piece 101 is positioned at the outermost side during winding, namely, the first pole piece 101, the first diaphragm 103, the second pole piece 102 and the second diaphragm 104 are sequentially arranged from outside to inside along the radial direction of the compensation roller 5-2;
the hot-pressing roller 5-1 and the compensating roller 5-2 rotate around the respective axes according to the respective set speeds, and the pole piece and the diaphragm are taken from between the hot-pressing roller 5-1 and the compensating roller 5-2;
the hot press roller translation driving mechanism controls the hot press roller 5-1 to approach and press on the compensation roller 5-2 so as to thermally compound the pole piece and the diaphragm;
after the hot-pressing compounding is completed, the hot-pressing roller translation driving mechanism controls the hot-pressing roller 5-1 to retreat and leave the compensating roller 5-2; the compensation roller 5-2 rotates to drive the composite pole piece obtained after hot pressing backwards, the pole piece and the diaphragm continue to move backwards, after a certain distance of moving, the hot pressing roller translation driving mechanism controls the hot pressing roller 5-1 to approach and press the compensation roller 5-2, the pole piece and the diaphragm are thermally compounded again, then the hot pressing roller 5-1 leaves the compensation roller 5-2, the process is repeated, and intermittent thermal compounding operation is carried out on the pole piece and the diaphragm.
The intermittent thermal compounding mechanism 5 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 pole piece and the diaphragm are not compounded together, and the first pole piece 101 is positioned at the outermost side, as shown in fig. 3, the length of the first pole piece 101 in the unheated compounding area is larger than that of the rest material belts (the second pole piece and the first/second diaphragm), so that the compensation of the lengths of the inner layer material belts and the outer layer material belts is realized, and the phenomenon that the inner layer pole piece of the battery core is wrinkled due to the consistent lengths of the inner layer material belts and the outer layer material belts can be avoided when the composite pole piece is wound through a winding needle, thereby achieving the effect of improving the quality of the battery core.
As shown in fig. 5, the traction mechanism 6 of the present embodiment includes a first traction roller 6-1 and a second traction roller 6-2 that are disposed opposite to each other. The first pulling roll 6-1 and the second pulling roll 6-2 are both rotatable about their own axes. The axis of the first traction roller 6-1 is parallel to the axis of the second traction roller 6-2, the first traction roller 6-1 is a driving roller, and the second traction roller 6-2 is a driven roller.
As shown in fig. 6, the second traction roller 6-2 of the present embodiment includes a main shaft 6-21, a roller frame 6-22, rollers 6-23, and roller shafts 6-24. The roller frames 6-22 are provided at both ends of the main shaft 6-21, and the roller frames 6-22 of the present embodiment are provided on the main shaft 6-21 through bearings (not shown) so that the roller frames 6-22 can rotate around the axis of the main shaft 6-21. The roller 6-23 is rotatably arranged on the roller frame 6-22 through a roller shaft 6-24. In this embodiment, a roller shaft fixing hole (not numbered) is formed in the roller frame 6-22, both ends of the roller shaft 6-24 are disposed in the roller shaft fixing hole, and the roller 6-23 is disposed on the roller shaft 6-24 via a bearing (not shown), thereby being disposed on the roller frame 6-22. In other embodiments, the roller frame may be fixed relative to the main shaft, and the main shaft may rotate around its own axis, so long as the roller frame can rotate around the axis of the main shaft.
The roller frame 6-22 is provided with a plurality of rollers 6-23, the rollers 6-23 are uniformly arranged at intervals along the circumferential direction and are positioned at the periphery of the main shaft 6-21, and each roller 6-23 is arranged on the roller frame 6-22 through a respective roller shaft 6-24. The roller frames 6-22 of the embodiment are provided with 6 rollers 6-23 which are arranged at intervals. When the roller frame 6-22 rotates around the axis of the main shaft 6-21, the roller 6-23 can also rotate around the axis of the roller shaft 6-24.
When the traction mechanism 6 carries out traction, a composite pole piece is taken from between the first traction roller 6-1 and the second traction roller 6-2, the first pole piece 101 in the composite pole piece is opposite to the second traction roller 6-2, and when the second traction roller 6-2 is pressed on the first traction roller 6-1, the roller wheel 6-23 is always pressed on the first traction roller 6-1 and is contacted with the first pole piece 101; the friction force generated between the first traction roller 6-1 and the second traction roller 6-2 (the roller 6-23) when rotating causes the roller frame 6-22 to roll along, and the roller 6-23 contacted with the first traction roller 6-1 (the composite pole piece) also rolls along; because the second traction roller 6-2 is provided with a plurality of rollers 6-23 which are arranged at intervals along the circumferential direction, the rollers 6-23 which are arranged at intervals along the circumferential direction are pressed on the first traction roller 6-1, under the traction of the rollers 6-23 and the first traction roller 6-1, the composite pole piece can be driven forward, the rollers 6-23 which are arranged at intervals can not be extruded to one side (the side where the first pole piece is located) of the wave-shaped composite pole piece, the first pole piece which is waved outside the composite pole piece can be effectively prevented from wrinkling, the quality of an electric core is improved, and the winding efficiency is improved.
A tension control device 8 and a second swing deviation rectifying mechanism 9 are also arranged between the traction mechanism 6 and the winding head 7 in sequence. A roller passing is arranged between the traction mechanism 6 and the winding head 7, specifically, a roller embossing 10 is arranged between the intermittent thermal compounding mechanism 5 and the traction mechanism 6 and between the traction mechanism 6 and the second swing deviation correcting mechanism 9 as a roller passing. As shown in fig. 7, the patterned roll 10 of the present embodiment includes a main roll shaft 10-1 and a plurality of rotating roll shafts 10-2 circumferentially spaced apart from each other and uniformly distributed around the main roll shaft 10-1. In the present embodiment, the main roller shaft 10-1 is provided with the rotary roller shaft support 10-3 at both ends thereof, and the rotary roller shaft 10-2 is provided on the rotary roller shaft support 10-3. The rotary roller shaft bracket 10-3 is rotatable around the main roller shaft 10-1 by means of bearings. The passing roller has a conventional passing roller besides the patterned roller.
According to the embodiment, the periphery of the main roll shaft 10-1 is provided with the plurality of rotary roll shafts 10-2 distributed along the circumferential direction, the preset distance is arranged between any two adjacent rotary roll shafts 10-2, when the rotary roll shaft support 10-3 rotates relative to the main roll shaft 10-1, the rotary roll shafts 10-2 arranged on the rotary roll shaft support 10-3 can rotate along with the rotary roll shafts and convey the composite pole pieces, the preset distance is arranged between the rotary roll shafts 10-2, an avoidance space can be formed, the wave position of the composite pole pieces can be temporarily placed in the avoidance space (namely, the side of the first pole piece of the composite pole pieces is contacted with the rotary roll shafts) in the conveying process, so that the wave position is prevented from being extruded, the composite pole pieces are wrinkled or folded at the wave position, and the quality of the battery core is affected. In addition, the roller passing through adopting the pattern roller structure can avoid the compound pole piece from generating folds or creases in the process of conveying the compound pole piece, so that the conveying speed of the compound pole piece can be accelerated, and the winding efficiency of the battery cell can be improved.
The winding head 7 of the embodiment is provided with 3 winding needles 7-1 which are arranged at intervals along the circumference, and three stations are respectively formed: winding station A, rubberizing station B and unloading station C. The winding needle 7-1 may be a nip roller type winding needle or a vacuum winding needle. The winding needle 7-1 at the winding station A is used for winding the composite pole piece into an electric core; the winding needle 7-1 at the rubberizing station B is matched with the ending press roller mechanism 10 and the rubberizing termination press roller mechanism 11 to realize ending rubberizing of the battery cell; and the winding needle 7-1 at the blanking station C is matched with a blanking mechanism such as a blanking manipulator to realize the blanking of the battery cell. A diaphragm following and cutting mechanism 12 is provided between the winding station a and the rubberizing station B for cutting the diaphragm.
The following describes the cell winding method of the present invention:
the first pole piece unreeling mechanism 1, the second pole piece unreeling mechanism 2, the first diaphragm unreeling mechanism 3 and the second diaphragm unreeling mechanism 4 unreels the first pole piece, the second pole piece, the first diaphragm and the second diaphragm respectively, and the first pole piece, the second pole piece, the first diaphragm and the second diaphragm are stacked in the sequence of the first pole piece, the first diaphragm, the second pole piece and the second diaphragm; when the second pole piece 102 passes through the cutting and separating rubberizing mechanism 2-1, cutting and rubberizing connection operations are carried out at the cutting and separating rubberizing mechanism 2-1 to form a pole piece discontinuous and material belt continuous piece; the sheet feeding clamp 1-2 and the sheet cutting knife 1-3 ensure that the second sheet and the diaphragm are continuously carried at the thermal compounding station without interruption in a sheet feeding mode by following and cutting the first sheet, and the gap thermal compounding efficiency is improved;
the first pole piece 101, the second pole piece 102, the first diaphragm 103 and the second diaphragm 104 are subjected to thermal compounding at the intermittent thermal compounding mechanism 5 according to the sequence of the first pole piece 101, the first diaphragm 103, the second pole piece 102 and the second diaphragm 104 to obtain a compound pole piece, the thermal compression roller 5-1 and the compensation roller 5-2 of the intermittent thermal compounding mechanism 5 are subjected to thermal compounding according to a set time interval, the first pole piece 101, the second pole piece 102, the first diaphragm 103 and the second diaphragm 104 are subjected to thermal compounding, the first pole piece 101 is positioned at the outermost side of the compensation roller 5-2 during thermal compounding, the thermal compounding is performed to obtain a compound pole piece with a wavy side surface (the side surface where the first pole piece is positioned), and the length of a wavy material belt (the first pole piece) is longer than that of other material belts;
the traction mechanism 6 is used for traction of the composite pole piece, wherein the hot-press roller adopts a pattern roller structure, so that wrinkling of the composite pole piece can be prevented;
the winding of the main part of the composite pole piece is completed at the winding head 7 by a winding needle 7-1 of a winding station A, a diaphragm tracking and cutting mechanism 12 tracks and cuts off the composite pole piece, the composite pole piece is transferred to a rubberizing station B for ending rubberizing under the condition of no stop of winding, meanwhile, the winding station A starts to roll a new battery cell, and a blanking station C performs blanking.
In another embodiment, when the hot press roller does not translate but directly presses on the compensation roller, the hot press roller pressure control mechanism controls the pressure of the hot press roller on the compensation roller, so that the pressure of the hot press roller on the compensation roller is adjusted to reach the thermal compounding pressure threshold, or the pressure is smaller than the thermal compounding pressure threshold for thermal compounding, the thermal compounding step of the intermittent thermal compounding mechanism with the structure is as follows:
the unreeled pole piece and the diaphragm are wound on the compensation roller for tape feeding, and the first pole piece is positioned at the outermost side during winding, namely the first pole piece, the first diaphragm, the second pole piece and the second diaphragm are sequentially arranged from outside to inside along the radial direction of the compensation roller;
the hot-pressing roller and the compensation roller rotate around respective axes according to respective set speeds, the hot-pressing roller is pressed on the compensation roller, the pole piece and the diaphragm are taken away from between the hot-pressing roller and the compensation roller, and the compensation roller drives the composite pole piece after hot-pressing to integrally drive backwards when rotating;
in the process of tape feeding, the hot-press pressure control mechanism adjusts the pressure of the hot-press on the compensation roller to enable the pressure of the hot-press on the compensation roller to reach a hot-compound pressure threshold, the pole piece and the diaphragm are compounded together, after hot-press compounding is completed, the hot-press pressure control mechanism adjusts the pressure of the hot-press on the compensation roller to enable the pressure of the hot-press on the compensation roller to be smaller than the hot-compound pressure threshold, and at the moment, the pole piece and the diaphragm between the hot-press roller and the compensation roller cannot be compounded together due to the fact that the pressure is small;
and the composite pole piece obtained after the hot pressing is driven backwards by the rotation of the compensation roller, the composite pole piece is fed backwards, after a certain distance is fed, the hot-pressing roller pressure control mechanism adjusts the pressure of the hot-pressing roller on the compensation roller to reach a hot-compounding pressure threshold value, the pole piece and the diaphragm are subjected to hot compounding, then the pressure of the hot-pressing roller on the compensation roller is adjusted to be smaller than the hot-compounding pressure threshold value, the process is repeated, and the pole piece and the diaphragm are subjected to hot compounding operation.
The intermittent thermal compounding mechanism of the embodiment realizes intermittent thermal compounding by controlling the hot press 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. A thermal compounding winder, comprising:
the device comprises a first pole piece unreeling mechanism, a second pole piece unreeling mechanism, a first diaphragm unreeling mechanism, a second diaphragm unreeling mechanism, an intermittent thermal compounding mechanism, a traction mechanism and a winding head, wherein the intermittent thermal compounding mechanism, the traction mechanism and the winding head are sequentially arranged along the transfer direction of an unreeled material belt;
the intermittent thermal compounding mechanism is used for carrying out intermittent thermal compounding on the pole pieces and the diaphragms which are laminated together to form compound pole pieces in which a thermal compounding area and an uncomplexed area are alternately arranged in sequence;
the traction mechanism is used for traction of the composite pole piece;
the winding head is provided with a winding needle for winding the composite pole piece into an electric core.
2. The thermal compounding winder of claim 1, wherein: the intermittent thermal compounding mechanism comprises a hot pressing roller and a compensating roller which are oppositely arranged, and the compensating roller and the hot pressing roller can rotate around the axis of the hot pressing roller;
the hot-pressing roller can press the compensation roller, the pole piece and the diaphragm are thermally compounded together when the pressure of the hot-pressing roller on the compensation roller reaches a thermal compounding pressure threshold, 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 and the pressure on the compensation roller reaches the thermal compounding pressure threshold according to a set time interval, and intermittent thermal compounding of the pole piece and the diaphragm is realized.
3. The thermal compounding winder of claim 2, wherein: the heated platen roller may translate to approach and press against the compensation roller or to leave the compensation roller.
4. The thermal compounding winder of claim 2, wherein: the hot-press roll pressing device further comprises a hot-press roll pressing control mechanism for controlling the pressure of the hot-press roll pressing on the compensation roll.
5. The thermal compounding winder of claim 2, wherein: the hot pressing roller and the compensation roller are both driving rollers, the hot pressing roller is driven to rotate by a rotary driving motor, an output shaft of the rotary driving motor is connected with a transmission shaft by a coupler, and the transmission shaft is connected with a rotating shaft of the hot pressing roller by a one-way bearing; the rotating speed of the hot pressing roller is lower than that of the compensating roller.
6. The thermal compounding winder of claim 1, wherein: the traction mechanism comprises a first traction roller and a second traction roller which are oppositely arranged, the first traction roller and the second traction roller can rotate around the axis of the traction mechanism, the first traction roller is a driving roller, and the second traction roller is a driven roller;
the second traction roller comprises a main shaft, a roller frame arranged on the main shaft, a roller shaft arranged on the roller frame and a roller arranged on the roller shaft;
the roller frame can rotate around the axis of the main shaft, the roller shafts are positioned at the periphery of the main shaft, a plurality of roller shafts are arranged at intervals along the circumferential direction, the roller shafts can rotate around the axis of the roller shafts, intervals exist between the adjacent roller shafts in the circumferential direction, and when the second traction roller is pressed on the first traction roller, at least one roller shaft is pressed on the first traction roller.
7. The thermal compounding winder of claim 1, wherein: a plurality of roller passing rollers are arranged on the material belt moving path between the traction mechanism and the winding head, the roller passing rollers comprise pattern rollers, and each pattern roller comprises a main roller shaft and a plurality of rotary roller shafts arranged at the periphery of the main roller shaft at intervals along the circumference;
the utility model discloses a roller, including main roller, rotatory roller support, rotatory roller support is provided with the both ends of main roller, rotatory roller support can wind the main roller rotates, rotatory roller set up in on the rotatory roller support.
8. A method of winding a battery cell using the thermal compound winding machine according to any one of claims 1 to 7, comprising the steps of:
the first pole piece unreeling mechanism, the second pole piece unreeling mechanism, the first diaphragm unreeling mechanism and the second diaphragm unreeling mechanism unreels a first pole piece, a second pole piece, a first diaphragm and a second diaphragm respectively; the first pole piece unreeling mechanism comprises a pole piece feeding clamp and a pole piece cutter which are sequentially arranged, and the pole piece feeding clamp and the pole piece cutter carry out tracking and cutting on the first pole piece; the second pole piece unreeling mechanism comprises a cutting and separating rubberizing mechanism, the cutting and separating rubberizing mechanism is used for connecting the cut material strips through an adhesive tape after cutting the second pole piece, and when the second pole piece passes through the cutting and separating rubberizing mechanism, cutting and rubberizing connection operations are carried out at the cutting and separating rubberizing mechanism to form a pole piece discontinuous and material strip continuous piece;
the first pole piece, the second pole piece, the first diaphragm and the second diaphragm are stacked in sequence, intermittent thermal compounding is carried out at the intermittent thermal compounding mechanism to obtain a compound pole piece, the first pole piece is located at the outermost side during thermal compounding, the compound pole piece with a wavy surface is obtained through thermal compounding, and the length of the first pole piece is larger than that of the second pole piece, the first diaphragm and the second diaphragm;
the traction mechanism is used for traction of the composite pole piece;
the composite pole piece is wound into an electric core at the winding head.
9. The cell winding method of claim 8, wherein: when the intermittent thermal compounding mechanism carries out thermal compounding on the pole piece and the diaphragm,
winding the unreeled pole piece and the diaphragm on the compensation roller, wherein the first pole piece is positioned at the outer side;
the hot-pressing roller and the compensation roller rotate around respective axes according to set speeds, and the pole piece and the diaphragm are taken between the hot-pressing roller and the compensation roller;
controlling the hot-pressing roller to approach and press the compensation roller to thermally compound the pole piece and the diaphragm, then controlling the hot-pressing roller to leave the compensation roller, wherein the pole piece and the diaphragm cannot be compounded together, driving the composite piece obtained after hot-pressing to backward by the rotation of the compensation roller, after a certain distance of tape, controlling the hot-pressing roller to approach and press the compensation roller again, thermally compounding the pole piece and the diaphragm again, then controlling the hot-pressing roller to leave the compensation roller again, repeating the above processes, and performing intermittent thermal compounding operation on the pole piece and the diaphragm;
or winding the unreeled pole piece and the diaphragm on the compensation roller, wherein the first pole piece is positioned at the outer side;
the hot-pressing roller and the compensation roller rotate around respective axes according to set speeds, the hot-pressing roller is pressed on the compensation roller, and the pole piece and the diaphragm are taken from between the hot-pressing roller and the compensation roller;
controlling the pressure of the hot-pressing roller on the compensation roller to enable the pressure of the hot-pressing roller on the compensation roller to reach a thermal composite pressure threshold, thermally compositing the pole piece and the diaphragm, and then controlling the pressure of the hot-pressing roller on the compensation roller to enable the pressure of the hot-pressing roller on the compensation roller to be smaller than the thermal composite pressure threshold, wherein the pole piece and the diaphragm cannot be composited together;
and the compensation roller rotates to drive the composite sheet obtained after hot pressing backwards, after a certain distance of tape is taken, the pressure of the hot pressing roller on the compensation roller is controlled to reach a thermal composite pressure threshold value again, the pole piece and the diaphragm are subjected to thermal composite, then the process is repeated when the pressure of the hot pressing roller on the compensation roller is controlled to be smaller than the thermal composite pressure threshold value, and the pole piece and the diaphragm are subjected to thermal composite operation.
10. The cell winding method of claim 8, wherein:
the composite pole piece is taken from the first traction roller to the first traction roller, the first pole piece is opposite to the second traction roller, and when the second traction roller is pressed on the first traction roller, the roller is always pressed on the first traction roller and is contacted with the first pole piece;
and/or when the composite pole piece bypasses the roller, the side where the first pole piece is positioned is contacted with the rotary roller shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311863523.4A CN117790870A (en) | 2023-12-29 | 2023-12-29 | Thermal composite winding machine and battery core winding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311863523.4A CN117790870A (en) | 2023-12-29 | 2023-12-29 | Thermal composite winding machine and battery core winding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117790870A true CN117790870A (en) | 2024-03-29 |
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ID=90396263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311863523.4A Pending CN117790870A (en) | 2023-12-29 | 2023-12-29 | Thermal composite winding machine and battery core winding method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117790870A (en) |
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2023
- 2023-12-29 CN CN202311863523.4A patent/CN117790870A/en active Pending
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