Cell winding equipment and cell winding method

Abstract

The present invention discloses a battery cell winding device and a battery cell winding method. The battery cell winding device includes a positive electrode sheet feeding device for providing a positive electrode sheet tape; a first separator feeding device for providing a first separator tape; a first lamination device for successively cutting the positive electrode sheet tape into tapes of a set length and laminating them on the first separator tape at a set spacing to form a first laminated tape, and conveying the first laminated tape to a winding device; a negative electrode sheet feeding device for providing a negative electrode sheet tape; a second separator feeding device for providing a second separator tape; a second lamination device for successively cutting the negative electrode sheet tape into tapes of a set length and laminating them on the second separator tape at a set spacing to form a second laminated tape, and conveying the second laminated tape to the winding device; and a winding device for winding the first laminated tape and the second laminated tape into a battery cell. The battery cell winding device of the present invention has high production efficiency and good production quality of the battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production, and particularly to a core winding device and a core winding method. Background Art

[0002] The structures of existing battery cores mainly include a stacked type and a wound type. Among them, the wound core is usually formed by winding a positive electrode sheet, a negative electrode sheet, and a separator.

[0003] The production of existing wound cores generally uses a dedicated winding device. The winding device usually includes a positive electrode sheet unwinding mechanism, a negative electrode sheet unwinding mechanism, a separator unwinding mechanism, and a winding mechanism. The positive electrode sheet unwinding mechanism, the negative electrode sheet unwinding mechanism, and the separator unwinding mechanism respectively convey the positive electrode sheet strip, the negative electrode sheet strip, and the separator strip to the winding mechanism. After the winding mechanism winds the positive electrode sheet strip, the negative electrode sheet strip, and the separator strip arranged in a specified order into a shape, the positive electrode sheet strip, the negative electrode sheet strip, and the separator strip are cut off in sequence, and a termination tape is attached to the end of the core.

[0004] Existing winding devices generally use a positive electrode sheet inserting mechanism and a negative electrode sheet inserting mechanism to insert the positive electrode sheet strip and the negative electrode sheet strip into the winding mechanism. At this time, it is necessary to perform deviation correction on the positive electrode sheet strip, the negative electrode sheet strip, and the separator strip to align the positive electrode sheet strip, the negative electrode sheet strip, and the separator strip with each other. The above deviation correction process is relatively complex, resulting in low production efficiency of the winding device and poor production quality of the core. Summary of the Invention

[0005] The purpose of the present invention is to provide a core winding device and a core winding method to solve the technical problems of low production efficiency of the winding device and poor production quality of the core in the prior art.

[0006] To solve the above technical problems, a technical solution adopted in an embodiment of the present invention is: a core winding device, including: a positive electrode sheet feeding device for providing a positive electrode sheet strip; a first separator feeding device for providing a first separator strip; a first compounding device for successively cutting the positive electrode sheet strip into strips of a set length and compounding them on the first separator strip at a set interval to form a first compound strip, and conveying the first compound strip to a winding device; a negative electrode sheet feeding device for providing a negative electrode sheet strip; a second separator feeding device for providing a second separator strip; a second compounding device for successively cutting the negative electrode sheet strip into strips of a set length and compounding them on the second separator strip at a set interval to form a second compound strip, and conveying the second compound strip to the winding device; a winding device for winding the first compound strip and the second compound strip into a core.

[0007] In a specific embodiment, the first composite device includes: a first pretreatment mechanism for pretreating the positive electrode strip and / or the first separator strip so that the positive electrode strip and the first separator strip can be composite; a positive electrode insertion and cutting mechanism for conveying the positive electrode strip to a first composite mechanism and cutting the positive electrode strip into strips of a set length; a first composite mechanism for successively composite the positive electrode strips of the set length on the first separator strip; the second composite device includes: a second pretreatment mechanism for pretreating the negative electrode strip and / or the second separator strip so that the negative electrode strip and the second separator strip can be composite; a negative electrode insertion and cutting mechanism for conveying the negative electrode strip to a second composite mechanism and cutting the negative electrode strip into strips of a set length; a second composite mechanism for successively composite the negative electrode strips of the set length on the second separator strip.

[0008] In a specific embodiment, the first composite mechanism includes: a slave composite wheel capable of moving relative to the master composite wheel to clamp or release the first composite strip between the slave composite wheel and the master composite wheel; a master composite wheel disposed opposite to the slave composite wheel and capable of rotating to drive the movement of the first composite strip; the second composite mechanism includes: a slave composite wheel capable of moving relative to the master composite wheel to clamp or release the second composite strip between the slave composite wheel and the master composite wheel; a master composite wheel disposed opposite to the slave composite wheel and capable of rotating to drive the movement of the second composite strip.

[0009] In a specific embodiment, the first pretreatment mechanism and the second pretreatment mechanism are any one of a heating mechanism, a tape sticking mechanism, a gluing mechanism, a low-temperature plasma treatment mechanism, and an electrostatic adsorption mechanism.

[0010] In a specific embodiment, the positive electrode sheet inserting and cutting mechanism includes an inserting component and a cutting component. The inserting component includes: two clamping members arranged oppositely, connected to the driving end of an inserting driving member, capable of relatively moving to clamp or release the positive electrode sheet strip; an inserting driving member capable of driving the two clamping members to move towards or away from the first composite mechanism; the cutting component includes two cutting blades arranged oppositely, the two cutting blades are arranged on both sides of the positive electrode sheet strip, and capable of relatively moving to cut off the positive electrode sheet strip; the negative electrode sheet inserting and cutting mechanism includes an inserting component and a cutting component. The inserting component includes: two clamping members arranged oppositely, connected to the driving end of an inserting driving member, capable of relatively moving to clamp or release the negative electrode sheet strip; an inserting driving member capable of driving the two clamping members to move towards or away from the second composite mechanism; the cutting component includes two cutting blades arranged oppositely, the two cutting blades are arranged on both sides of the negative electrode sheet strip, and capable of relatively moving to cut off the negative electrode sheet strip.

[0011] In a specific embodiment, the winding device includes: a winding mechanism for winding the first composite strip and the second composite strip into an electric core; an end treatment mechanism for cutting off the first composite strip and the second composite strip connected to the electric core; a tape sticking mechanism for sticking a termination tape to the end of the electric core; a blanking mechanism for removing the electric core with the termination tape stuck from the winding mechanism.

[0012] In a specific embodiment, the winding device further includes: a composite strip buffer mechanism for buffering the first composite strip and the second composite strip; a composite strip tension adjusting mechanism for adjusting the tension of the first composite strip and the second composite strip; a composite strip length measuring mechanism for calculating the conveying length of the first composite strip and the second composite strip; a composite strip deviation rectifying mechanism for rectifying the first composite strip and the second composite strip along the width direction of the first composite strip and the second composite strip.

[0013] In a specific embodiment, the electric core winding equipment further includes a machine shell, an installation panel is arranged inside the machine shell, the winding mechanism is arranged on the installation panel, and the winding mechanism is located at the upper part of the installation panel.

[0014] Another technical solution adopted in the embodiment of the present invention is: a method for winding an electric core, including:

[0015] Providing a positive electrode sheet strip, a first separator strip, a negative electrode sheet strip, and a second separator strip;

[0016] The positive electrode strip is successively cut into strips of a set length and compounded on the first separator strip at a set spacing to form a first composite strip, and the negative electrode strip is successively cut into strips of a set length and compounded on the second separator strip at a set spacing to form a second composite strip;

[0017] The first composite strip and the second composite strip are conveyed to a winding mechanism, and the winding mechanism winds the first composite strip and the second composite strip into an electric core;

[0018] The first composite strip and the second composite strip connected to the electric core are cut off, and a termination tape is attached to the end of the electric core;

[0019] The electric core is removed from the winding mechanism.

[0020] In a specific embodiment, the step of successively cutting the positive electrode strip into strips of a set length and compounding them on the first separator strip at a set spacing to form a first composite strip includes:

[0021] Pre-treating the positive electrode strip and / or the first separator strip;

[0022] Cutting the positive electrode strip into strips of a set length and compounding them on the first separator strip;

[0023] The step of successively cutting the negative electrode strip into strips of a set length and compounding them on the second separator strip at a set spacing to form a second composite strip includes:

[0024] Pre-treating the negative electrode strip and / or the second separator strip;

[0025] Cutting the negative electrode strip into strips of a set length and compounding them on the second separator strip.

[0026] The beneficial effects of the present invention are:

[0027] (1) By pre-compounding the positive electrode strip on the first separator strip to form a first composite strip and the negative electrode strip on the second separator strip to form a second composite strip, the winding device does not need to perform complex deviation correction on the first separator strip, the positive electrode strip, the second separator strip, and the negative electrode strip, and the alignment of the first composite strip and the second composite strip is easier to achieve, so that the winding efficiency and winding quality of the winding device can be improved, and further the production efficiency of the winding equipment and the production quality of the electric core can be improved.

[0028] (2) Since the positive electrode sheet tape is laminated on the first separator tape and the negative electrode sheet tape is laminated on the second separator tape, the phenomenon of powder falling on the surfaces of the positive electrode sheet tape, the negative electrode sheet tape, the first separator tape, and the second separator tape, which may cause short circuits in the battery cells, is reduced, improving the safety of battery cell preparation.

[0029] (3) Since the positive electrode sheet tape is laminated on the first separator tape and is brought into the winding device by the first separator tape, and the negative electrode sheet tape is laminated on the second separator tape and is brought into the winding device by the second separator tape, there is no need to use the positive electrode inserting mechanism and the negative electrode inserting mechanism in the prior art to insert the positive electrode sheet tape and the negative electrode sheet tape into the winding device, avoiding the situation where the positive electrode inserting mechanism and the negative electrode inserting mechanism cannot control the heads of the positive electrode and the negative electrode, which may affect the accuracy of inserting into the winding device, and thus improving the quality of battery cell production.

[0030] (4) Since there are no processes for inserting and correcting the positive and negative electrode sheets, the auxiliary winding time is reduced, thereby shortening the overall time for winding one battery cell and improving the production efficiency of the battery cells.

[0031] (5) Tension-free or low-tension winding can be achieved, without stretching the positive electrode sheet tape, the negative electrode sheet tape, the first separator tape, and the second separator tape. The battery cells are not easily deformed, facilitating the unloading of the battery cells. There will be no phenomenon that the inner-ring separator of the battery cell is detached or wrinkled, and it is also convenient for subsequent processes, such as injecting electrolyte into the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic layout structure diagram of a battery cell winding device provided by a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To further illustrate the principle and structure of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In addition, the preferred embodiments hereinafter are only partial embodiments of the present invention, not all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0034] As Figure 1As shown in the figure, the battery cell winding device in the embodiment of the present invention includes: a positive electrode sheet feeding device 2, a first separator feeding device 3, a first lamination device 4, a negative electrode sheet feeding device 5, a second separator feeding device 6, a second lamination device 7, and a winding device 8. Among them, the positive electrode sheet feeding device 2 is used to provide a positive electrode sheet tape. The first separator feeding device 3 is used to provide a first separator tape. The first lamination device 4 is used to sequentially cut the positive electrode sheet tape into tapes of a set length and laminate them on the first separator tape at a set spacing to form a first laminated tape, and convey the first laminated tape to the winding device 8. The negative electrode sheet feeding device 5 is used to provide a negative electrode sheet tape. The second separator feeding device 6 is used to provide a second separator tape. The second lamination device 7 is used to sequentially cut the negative electrode sheet tape into tapes of a set length and laminate them on the second separator tape at a set spacing to form a second laminated tape, and convey the second laminated tape to the winding device 8. The winding device 8 is used to wind the first laminated tape and the second laminated tape into a battery cell.

[0035] By using the battery cell winding device provided in this embodiment, by pre-laminating the positive electrode sheet tape on the first separator tape to form a first laminated tape and laminating the negative electrode sheet tape on the second separator tape to form a second laminated tape, the winding device 8 does not need to perform complex deviation correction processing on the first separator tape, the positive electrode sheet tape, the second separator tape, and the negative electrode sheet tape, and the alignment of the first laminated tape and the second laminated tape is relatively easy to achieve, thereby improving the winding efficiency and winding quality of the winding device 8, and further improving the production efficiency of the winding device and the production quality of the battery cell. Since the positive electrode sheet tape is laminated on the first separator tape and the negative electrode sheet tape is laminated on the second separator tape, the phenomenon of powder falling on the surfaces of the positive electrode sheet tape, the negative electrode sheet tape, the first separator tape, and the second separator tape, which may cause a short circuit of the battery cell, is reduced, and the safety of battery cell preparation is improved. Since the positive electrode sheet tape is laminated on the first separator tape and is brought into the winding device 8 by the first separator tape, and the negative electrode sheet tape is laminated on the second separator tape and is brought into the winding device 8 by the second separator tape, there is no need to use the positive electrode inserting mechanism and the negative electrode inserting mechanism in the prior art to insert the positive electrode sheet tape and the negative electrode sheet tape into the winding device 8, avoiding the situation that the positive electrode inserting mechanism and the negative electrode inserting mechanism cannot control the heads of the positive electrode and the negative electrode, which affects the accuracy of insertion into the winding device 8, thereby improving the production quality of the battery cell. At the same time, since there are no processes of inserting and correcting the positive and negative electrode sheets, the winding auxiliary time is reduced, thereby shortening the overall time for winding a battery cell and improving the production efficiency of the battery cell. The battery cell winding device provided in this embodiment can achieve tension-free or low-tension winding, without stretching the positive electrode sheet tape, the negative electrode sheet tape, the first separator tape, and the second separator tape. The battery cell is not easily deformed, facilitating the feeding of the battery cell, and there will be no phenomenon that the inner-ring separator of the battery cell is carried away or wrinkled, and it is also convenient for subsequent processes, such as battery cell liquid injection.

[0036] In this embodiment, the positive electrode sheet feeding device 2 includes a positive electrode sheet unwinding mechanism 21, a first tension adjusting mechanism 24, a first deviation rectifying mechanism 25, a first driving mechanism 26, and a first length measuring mechanism 27. Among them, the positive electrode sheet unwinding mechanism 21 is used to unwind the positive electrode sheet strip. The first tension adjusting mechanism 24 is used to adjust the tension of the positive electrode sheet strip. The first deviation rectifying mechanism 25 is used to rectify the positive electrode sheet strip in the width direction of the positive electrode sheet strip. The first driving mechanism 26 is used to traction the positive electrode sheet strip in the direction of the first lamination device 4. The first length measuring mechanism 27 is used to calculate the conveying length of the positive electrode sheet strip to cooperate with the first lamination device 4 to cut out a strip of a set length.

[0037] Specifically, the positive electrode sheet unwinding mechanism 21, the first tension adjusting mechanism 24, the first deviation rectifying mechanism 25, the first driving mechanism 26, and the first length measuring mechanism 27 in this embodiment can adopt the mechanisms in the prior art, which will not be elaborated here. The connection sequence of the above mechanisms can be adjusted according to the situation. As a preferred embodiment, the first tension adjusting mechanism 24, the first deviation rectifying mechanism 25, the first driving mechanism 26, and the first length measuring mechanism 27 are arranged in sequence along the conveying direction of the positive electrode sheet strip.

[0038] In some specific embodiments, the positive electrode sheet feeding device 2 further includes a positive electrode sheet stockpiling unwinding mechanism 22 and a first automatic roll changing mechanism 23. Among them, the positive electrode sheet stockpiling unwinding mechanism 22 is used to unwind the positive electrode sheet spare strip. The first automatic roll changing mechanism 23 is used to cut off the strip in use when the strip in use in either the positive electrode sheet unwinding mechanism 21 or the positive electrode sheet stockpiling unwinding mechanism 22 is used up and connect it to the other strip to enable the other strip.

[0039] In this embodiment, the first separator feeding device 3 includes a first separator unwinding mechanism 31, and the first separator unwinding mechanism 31 is used to unwind the first separator strip.

[0040] In this embodiment, the first lamination device 4 includes: a first pretreatment mechanism 41, a positive electrode sheet inserting and cutting mechanism 42, and a first lamination mechanism 43. Among them, the first pretreatment mechanism 41 is used to pretreat the positive electrode sheet strip and / or the first separator strip so that the positive electrode sheet strip and the first separator strip can be laminated. The positive electrode sheet inserting and cutting mechanism 42 is used to convey the positive electrode sheet strip to the first lamination mechanism 43 and cut the positive electrode sheet strip into strips of a set length. The first lamination mechanism 43 is used to laminate the strips of the set length of the positive electrode sheet strip on the first separator strip in sequence.

[0041] Specifically, the pre-treatment in this embodiment may be pre-treatment methods such as heating, taping, glue bonding, low-temperature plasma treatment, electrostatic adsorption, etc. Correspondingly, the first pre-treatment mechanism 41 may be a pre-treatment mechanism such as a heating mechanism, a taping mechanism, a glue application mechanism, a low-temperature plasma treatment mechanism, an electrostatic adsorption mechanism, etc. Among them, in the case of heating, the positive electrode strip and the first separator strip can be heated simultaneously, or only the first separator strip can be heated. In the cases of glue bonding, low-temperature plasma treatment, and electrostatic adsorption, the above-mentioned treatments can be performed on the positive electrode strip or the first separator strip. Preferably, the above-mentioned treatments are performed on the first separator strip. In the case of taping, the taping treatment can be performed at the first composite mechanism 43. While the first composite mechanism 43 laminates the positive electrode strip and the first separator strip, it tapes the overlapping portion of the positive electrode strip and the first separator strip (the width of the positive electrode strip is smaller than the width of the first separator strip).

[0042] Specifically, the positive electrode insertion and cutting mechanism 42 in this embodiment may include an insertion component and a cutting component. Among them, the insertion component may include two clamping members arranged oppositely and an insertion driving member. The two clamping members are connected to the driving end of the insertion driving member and can move relatively to clamp or release the positive electrode strip. The insertion driving member can drive the two clamping members to move towards or away from the first composite mechanism 43. In some specific embodiments, the clamping members may be clamping plates or clamping rollers. The cutting component may include two cutting blades arranged oppositely. The two cutting blades are arranged on both sides of the positive electrode strip and can move relatively to cut the positive electrode strip.

[0043] Specifically, the first composite mechanism 43 in this embodiment may include a main composite wheel and a slave composite wheel. Among them, the slave composite wheel can move relative to the main composite wheel to clamp or release the first composite strip between the slave composite wheel and the main composite wheel. The main composite wheel and the slave composite wheel are arranged oppositely and can rotate to drive the first composite strip to move. In this embodiment, the main composite wheel is located below the slave composite wheel, and the first separator strip passes around the main composite wheel. When the positive electrode insertion and cutting mechanism 42 sends the positive electrode strip onto the first separator strip, the slave composite wheel moves relative to the main composite wheel to press the positive electrode strip and the first separator strip tightly. Then, the main composite wheel rotates to tractionally convey the first separator strip and the positive electrode strip in the direction of the winding device 8. The first separator strip and the positive electrode strip are pressed together by the main composite wheel and the slave composite wheel to form a first composite strip. When a positive electrode strip of a set length is tractioned, the positive electrode insertion and cutting mechanism 42 cuts the positive electrode strip, the slave composite wheel moves away from the main composite wheel, and the positive electrode insertion and cutting mechanism 42 continues to convey the positive electrode strip to the first composite mechanism 43 for the next composite operation.

[0044] In this embodiment, the negative electrode sheet feeding device 5 includes a negative electrode sheet unwinding mechanism 51, a negative electrode sheet stockpiling and unwinding mechanism 52, a second automatic roll changing mechanism 53, a second tension adjusting mechanism 54, a second deviation rectifying mechanism 55, a second driving mechanism 56 and a second length measuring mechanism 57. The structures of the above mechanisms are the same as those of the relevant mechanisms in the positive electrode sheet feeding device 2, and will not be elaborated here.

[0045] In this embodiment, the second separator feeding device 6 includes a second separator unwinding mechanism 61, and the second separator unwinding mechanism 61 is used to unwind the second separator tape.

[0046] In this embodiment, the second lamination device 7 includes a second pretreatment mechanism 71, a negative electrode sheet inserting and cutting mechanism 72 and a second lamination mechanism 73. The structures of the above mechanisms are the same as those of the relevant mechanisms in the first lamination device 4, and will not be elaborated here.

[0047] In this embodiment, the winding device 8 includes: a winding mechanism 81, a finishing treatment mechanism 82, a tape sticking mechanism 83 and a blanking mechanism 84. Among them, the winding mechanism 81 is used to wind the first laminated tape and the second laminated tape into an electric core. The finishing treatment mechanism 82 is used to cut off the first laminated tape and the second laminated tape connected to the electric core. The tape sticking mechanism 83 is used to stick a termination tape to the finishing end of the electric core to prevent the finishing end of the electric core from coming loose. The blanking mechanism 84 is used to remove the electric core with the termination tape stuck from the winding mechanism 81.

[0048] In this embodiment, the winding mechanism 81 may include a turntable and a winding needle assembly. There are two or three stations provided on the turntable, and one of the stations is a winding station where a winding needle assembly is provided. The winding needle assembly is used to wind the first composite tape and the second composite tape into an electric core. Among them, when two stations are adopted, the turntable further includes a tape pasting and blanking station. The tape pasting and blanking station and the winding station are evenly arranged along the circumferential direction of the turntable. Preferably, the winding station is located at the lower end of the turntable, and the tape pasting and blanking station is located at the upper end of the turntable. At the winding station, the first composite tape and the second composite tape are wound into an electric core. Then, the turntable rotates 180° so that the electric core rotates to the tape pasting and blanking station, and the finishing treatment mechanism 82 cuts off the first composite tape and the second composite tape connected to the electric core. The tape pasting mechanism 83 pastes a termination tape on the finishing end of the electric core, and the blanking mechanism 84 removes the electric core with the termination tape pasted thereon from the winding mechanism 81. When three stations are adopted, the turntable further includes a tape pasting station and a blanking station. The tape pasting station, the blanking station and the winding station are evenly arranged along the circumferential direction of the turntable. Preferably, the winding station is located at the lower end of the turntable, and the tape pasting station and the blanking station are located at the upper left end and the upper right end of the turntable. At the winding station, the first composite tape and the second composite tape are wound into an electric core. Then, the turntable rotates 120° so that the electric core rotates to the tape pasting station to paste the termination tape. After the termination tape is pasted, the turntable rotates 120° again so that the electric core rotates to the blanking station and is removed from the winding mechanism 81.

[0049] In this embodiment, the winding device 8 further includes a composite tape buffer mechanism 85, a composite tape driving mechanism 86, a composite tape tension adjusting mechanism 87, a composite tape length measuring mechanism 88 and a composite tape deviation rectifying mechanism 89. The above mechanisms are all in two groups and are respectively arranged along the conveying directions of the first composite tape and the second composite tape. Among them, the composite tape buffer mechanism 85 is used to buffer the first composite tape and the second composite tape. The composite tape driving mechanism 86 is used to traction the first composite tape and the second composite tape in the direction of the winding mechanism 81. The composite tape tension adjusting mechanism 87 is used to adjust the tensions of the first composite tape and the second composite tape. The composite tape length measuring mechanism 88 is used to calculate the conveying lengths of the first composite tape and the second composite tape. The composite tape deviation rectifying mechanism 89 is used to rectify the first composite tape and the second composite tape along the width directions of the first composite tape and the second composite tape.

[0050] Specifically, the composite tape buffer mechanism 85, the composite tape driving mechanism 86, the composite tape tension adjusting mechanism 87, the composite tape length measuring mechanism 88, and the composite tape deviation rectifying mechanism 89 in this embodiment can adopt the mechanisms in the prior art, which will not be elaborated here. The connection sequence of the above mechanisms can be adjusted according to the situation. As a preferred embodiment, the composite tape buffer mechanism 85, the composite tape driving mechanism 86, the composite tape tension adjusting mechanism 87, the composite tape length measuring mechanism 88, and the composite tape deviation rectifying mechanism 89 are arranged in sequence along the conveying direction of the first composite tape and the second composite tape.

[0051] Optionally, the composite tape driving mechanism 86 can be not provided, or can be provided between the composite mechanism and the composite tape buffer mechanism 85 and / or between the composite tape buffer mechanism 85 and the composite tape tension adjusting mechanism 87.

[0052] In this embodiment, the battery core winding device further includes a machine shell 1. An installation panel 11 is arranged inside the machine shell 1. A positive electrode sheet feeding device 2, a first separator feeding device 3, a first composite device 4, a negative electrode sheet feeding device 5, a second separator feeding device 6, a second composite device 7, and a winding device 8 are arranged on the installation panel 11. Through the installation panel 11, the positive electrode sheet feeding device 2, the first separator feeding device 3, the first composite device 4, the negative electrode sheet feeding device 5, the second separator feeding device 6, the second composite device 7, and the winding device 8 form an integral structure.

[0053] Furthermore, a partition 12 is arranged inside the machine shell 1. The partition 12 divides the inner cavity of the machine shell 1 into at least three independent chambers, which are the left chamber, the middle chamber, and the right chamber from left to right. The winding device 8 is arranged in the middle chamber. The positive electrode sheet feeding device 2, the first separator feeding device 3, and the first composite device 4 can be arranged in the left chamber or the right chamber, and the negative electrode sheet feeding device 5, the second separator feeding device 6, and the second composite device 7 can be arranged in the right chamber or the left chamber. Among them, the winding mechanism 81 of the winding device 8 is arranged in the upper part of the middle chamber. Setting the winding device 8 separately in the middle chamber can prevent the dust generated during the unwinding process or the conveying process of the tapes of several feeding devices from polluting the winding mechanism 81. Since the dust in the winding device will settle naturally, arranging the winding mechanism 81 in the upper part of the middle chamber can reduce the pollution of the dust to the battery core wound by the winding mechanism 81, and at the same time avoid the influence of the falling of the parts of other mechanisms on the winding mechanism 81.

[0054] Further, the left chamber is divided into an upper left chamber and a lower left chamber by the partition 12. The positive electrode sheet feeding device 2 is arranged in the upper left chamber, and the first separator feeding device 3 is arranged in the lower left chamber. The right chamber is divided into an upper right chamber and a lower right chamber by the partition 12. The negative electrode sheet feeding device 5 is arranged in the upper right chamber, and the second separator feeding device 6 is arranged in the lower right chamber.

[0055] In this embodiment, the battery cell winding device further includes a battery cell conveying device 9, and the battery cell conveying device 9 is used to receive the battery cells from the blanking mechanism 84 and move the battery cells out of the battery cell winding device.

[0056] Specifically, the battery cell conveying device 9 includes a battery cell conveying line 91 and a discharging mechanism 92. The battery cell conveying line 91 is disposed at the top of the battery cell conveying device 9 and is used to transfer the battery cells from the blanking mechanism 84 to the discharging mechanism 92, and the discharging mechanism 92 is used to move the battery cells to other places.

[0057] The present invention also provides a method for winding a battery cell, and the method can be implemented by using the above-mentioned battery cell winding device. According to a preferred embodiment of the present invention, a method for winding a battery cell may include the steps listed below.

[0058] S1: Provide a positive electrode sheet tape, a first separator tape, a negative electrode sheet tape, and a second separator tape. Specifically, this step S1 may include: preparing a positive electrode sheet, a first separator, a negative electrode sheet, and a second separator and winding them into rolls for continuous production; respectively installing the positive electrode sheet roll, the first separator roll, the negative electrode sheet roll, and the second separator roll on the positive electrode unwinding mechanism 21, the first separator unwinding mechanism 31, the negative electrode unwinding mechanism 51, and the second separator unwinding mechanism 61; using the positive electrode unwinding mechanism 21, the first separator unwinding mechanism 31, the negative electrode unwinding mechanism 51, and the second separator unwinding mechanism 61 to respectively release the positive electrode sheet tape, the first separator tape, the negative electrode sheet tape, and the second separator tape.

[0059] S2: Cut the positive electrode sheet tape into tapes of a set length in sequence and compound them on the first separator tape at a set interval to form a first composite tape, and cut the negative electrode sheet tape into tapes of a set length in sequence and compound them on the second separator tape at a set interval to form a second composite tape. Specifically, in this step S2, cutting the positive electrode sheet tape into tapes of a set length in sequence and compounding them on the first separator tape at a set interval to form a first composite tape may include: preprocessing the positive electrode sheet tape and / or the first separator tape, and the preprocessing may include methods such as heating, taping, adhesive bonding, low-temperature plasma treatment, electrostatic adsorption, etc.; cutting the positive electrode sheet tape into a set length and compounding it on the first separator tape. In this step S2, cutting the negative electrode sheet tape into tapes of a set length in sequence and compounding them on the second separator tape at a set interval to form a second composite tape may include: preprocessing the negative electrode sheet tape and / or the second separator tape, and the preprocessing may include methods such as heating, taping, adhesive bonding, low-temperature plasma treatment, electrostatic adsorption, etc.; cutting the negative electrode sheet tape into a set length and compounding it on the second separator tape.

[0060] S3: Convey the first composite tape and the second composite tape to the winding mechanism, and the winding mechanism winds the first composite tape and the second composite tape into an electric core. Specifically, before conveying the first composite tape and the second composite tape to the winding mechanism in step S2, it may include performing deviation correction on the first composite tape and / or the second composite tape.

[0061] S4: Cut off the first composite tape and the second composite tape connected to the electric core, and attach a termination tape to the end of the electric core.

[0062] S5: Remove the electric core from the winding mechanism.

[0063] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, back, left, right, up, down", "horizontal, vertical, perpendicular, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as a limitation on the protection scope of the present invention. The orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0064] In addition, it should be noted that using words such as "first", "second" to limit components is only for the convenience of distinguishing the corresponding components. Without additional statement, the above words have no special meaning, so it cannot be understood as a limitation on the protection scope of the present invention.

[0065] Unless otherwise specifically stated, the relative arrangement, numerical expressions and values of the components and steps described in these embodiments do not limit the scope of the present invention.

[0066] Although the preferred examples of the present invention have been described above in conjunction with the drawings, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms of specific transformations without departing from the spirit and scope of the present invention as claimed. Therefore, all equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A battery cell winding device, characterized in that, Comprising: A positive electrode sheet feeding device for providing a positive electrode sheet tape; A first separator feeding device for providing a first separator tape; A first lamination device for successively cutting the positive electrode sheet tape into tapes of a set length and laminating them onto the first separator tape at a set spacing to form a first laminated tape, and conveying the first laminated tape to a winding device; A negative electrode sheet feeding device for providing a negative electrode sheet tape; A second separator feeding device for providing a second separator tape; A second lamination device for successively cutting the negative electrode sheet tape into tapes of a set length and laminating them onto the second separator tape at a set spacing to form a second laminated tape, and conveying the second laminated tape to the winding device; A winding device for winding the first laminated tape and the second laminated tape into an electric core; The winding device includes a blanking mechanism, and the electric core winding equipment further includes: An electric core conveying device for receiving the electric core from the blanking mechanism.

2. The electric core winding equipment according to claim 1, wherein: The first lamination device includes: A first pretreatment mechanism for pretreating the positive electrode sheet tape and / or the first separator tape so that the positive electrode sheet tape and the first separator tape can be laminated; A positive electrode insertion and cutting mechanism for conveying the positive electrode sheet tape to a first lamination mechanism and cutting the positive electrode sheet tape into tapes of a set length; A first lamination mechanism for successively laminating the positive electrode sheet tapes of a set length onto the first separator tape; The second lamination device includes: A second pretreatment mechanism for pretreating the negative electrode sheet tape and / or the second separator tape so that the negative electrode sheet tape and the second separator tape can be laminated; A negative electrode insertion and cutting mechanism for conveying the negative electrode sheet tape to a second lamination mechanism and cutting the negative electrode sheet tape into tapes of a set length; A second lamination mechanism for successively laminating the negative electrode sheet tapes of a set length onto the second separator tape.

3. The electric core winding equipment according to claim 2, wherein: The first lamination mechanism includes: A slave lamination wheel capable of moving relative to a master lamination wheel to clamp or release the first laminated tape between the slave lamination wheel and the master lamination wheel; A master lamination wheel disposed opposite to the slave lamination wheel, capable of rotating to drive the movement of the first laminated tape; The second lamination mechanism includes: A slave lamination wheel capable of moving relative to a master lamination wheel to clamp or release the second laminated tape between the slave lamination wheel and the master lamination wheel; A master lamination wheel disposed opposite to the slave lamination wheel, capable of rotating to drive the movement of the second laminated tape.

4. The core winding device according to claim 2, characterized in that, The first pretreatment mechanism and the second pretreatment mechanism are any one of a heating mechanism, a tape sticking mechanism, a gluing mechanism, a low-temperature plasma treatment mechanism, and an electrostatic adsorption mechanism.

5. The electric core winding equipment according to claim 2, wherein: The positive electrode insertion and cutting mechanism includes an insertion assembly and a cutting assembly, and the insertion assembly includes: Two oppositely arranged clamping members are connected to the driving end of the insertion driving member and can move relative to each other to clamp or release the positive electrode strip material; The insertion driving member can drive the two clamping members to move towards or away from the first composite mechanism; The cutting assembly includes two oppositely arranged cutting knives, and the two cutting knives are arranged on both sides of the positive electrode strip material and can move relative to each other to cut off the positive electrode strip material; The negative electrode insertion and cutting mechanism includes an insertion assembly and a cutting assembly, and the insertion assembly includes: Two oppositely arranged clamping members are connected to the driving end of the insertion driving member and can move relative to each other to clamp or release the negative electrode strip material; The insertion driving member can drive the two clamping members to move towards or away from the second composite mechanism; The cutting assembly includes two oppositely arranged cutting knives, and the two cutting knives are arranged on both sides of the negative electrode strip material and can move relative to each other to cut off the negative electrode strip material.

6. The core winding device according to claim 1, characterized in that, The winding device includes: A winding mechanism for winding the first composite strip and the second composite strip into an electric core; A finishing treatment mechanism for cutting off the first composite strip and the second composite strip connected to the electric core; An adhesive pasting mechanism for pasting a termination tape on the finishing end of the electric core; The blanking mechanism for removing the electric core with the termination tape pasted from the winding mechanism.

7. The core winding device according to claim 6, characterized in that, The winding device further includes: A composite strip buffer mechanism for buffering the first composite strip and the second composite strip; A composite strip tension adjusting mechanism for adjusting the tension of the first composite strip and the second composite strip; A composite strip length measuring mechanism for calculating the conveying length of the first composite strip and the second composite strip; A composite strip deviation rectifying mechanism for rectifying the first composite strip and the second composite strip along the width direction of the first composite strip and the second composite strip.

8. The core winding device according to claim 6, characterized in that, The electric core winding equipment further includes a machine shell, an installation panel is arranged inside the machine shell, the winding mechanism is arranged on the installation panel, and the winding mechanism is located at the upper part of the installation panel.

9. A method for winding an electrode core, characterized in that, Including: Providing a positive electrode strip material, a first separator strip material, a negative electrode strip material and a second separator strip material; Sequentially cutting the positive electrode strip material into strip materials of a set length and compounding them on the first separator strip material at a set interval to form a first composite strip, and sequentially cutting the negative electrode strip material into strip materials of a set length and compounding them on the second separator strip material at a set interval to form a second composite strip; Conveying the first composite strip and the second composite strip to the winding mechanism, and the winding mechanism winds the first composite strip and the second composite strip into an electric core; Cutting off the first composite strip and the second composite strip connected to the electric core, and pasting a termination tape on the finishing end of the electric core; Removing the electric core from the winding mechanism.

10. According to the method for winding an electric core as claimed in claim 9, wherein The step of sequentially cutting the positive electrode strip material into strip materials of a set length and compounding them on the first separator strip material at a set interval to form a first composite strip includes: Pre-treat the positive electrode sheet strip and / or the first separator strip; cut the positive electrode sheet strip into a set length and laminate it on the first separator strip; The step of sequentially cutting the negative electrode sheet strip into strips of a set length and laminating them on the second separator strip at a set spacing to form a second composite strip includes: Pre-treat the negative electrode sheet strip and / or the second separator strip; Cut the negative electrode sheet strip into a set length and laminate it on the second separator strip.

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