Winding device

Abstract

The present invention relates to a winding device for winding electrode sheets of an electric core, which comprises: a driving mandrel; a deformable structure body including a deformable supporting portion in a cylindrical structure, a first deformable bladder portion and a second deformable bladder portion. The first deformable bladder portion and the second deformable bladder portion are both arranged inside the deformable supporting portion and are arranged oppositely along the radial direction of the deformable supporting portion. The deformable structure body is sleeved outside the driving mandrel, and the driving mandrel is located between the first deformable bladder portion and the second deformable bladder portion; wherein, both the first deformable bladder portion and the second deformable bladder portion can be switched between an expanded state and a contracted state, so as to be able to jointly drive the parts of the deformable supporting portion corresponding to the first deformable bladder portion and the second deformable bladder portion to expand or contract along the radial direction of the driving mandrel, so that the deformable supporting portion is switched between a winding position and a discharging position, and the electrode sheets of the electric core can be wound on the outer peripheral surface of the deformable supporting portion in the winding position.

Description

Technical Field

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

[0002] Secondary batteries have become a new trend in energy development due to their high energy density, environmental friendliness, etc. Among them, the core component of the secondary battery, the battery cell, is generally formed by winding a first electrode sheet, a second electrode sheet, and a separator through a winding mechanism. The winding mechanism includes a winding needle. After the winding needle completes the winding work, the winding needle needs to be pulled out from the wound battery cell. However, since the winding needle is in a tight fit with the battery cell, when the winding needle is pulled out from the battery cell, the winding needle will easily bring out the electrode sheets formed by the first electrode sheet, the second electrode sheet, and the separator, resulting in the scrapping of the entire battery cell. Summary of the Invention

[0003] Embodiments of the present invention provide a winding device that can ensure a smooth and stable process of separating from the wound battery cell, reduce the possibility of the electrode sheets being brought out, and improve the yield of the battery cell.

[0004] On the one hand, embodiments of the present invention propose a winding device for winding battery cell electrode sheets. The winding device includes:

[0005] A driving mandrel; a deformable structure body, the deformable structure body includes a deformable supporting portion in the shape of a cylindrical structure, a first deformable bladder portion, and a second deformable bladder portion. The first deformable bladder portion and the second deformable bladder portion are both arranged inside the deformable supporting portion and are oppositely arranged along the radial direction of the deformable supporting portion. The deformable structure body is sleeved outside the driving mandrel, and the driving mandrel is located between the first deformable bladder portion and the second deformable bladder portion; wherein, both the first deformable bladder and the second deformable bladder portion can switch between an expanded state and a contracted state, so as to be able to jointly drive the parts of the deformable supporting portion corresponding to the first deformable bladder portion and the second deformable bladder portion to expand or contract along the radial direction of the driving mandrel, so that the deformable supporting portion switches between a winding position and a discharging position, and the battery cell electrode sheets can be wound around the outer peripheral surface of the deformable supporting portion in the winding position.

[0006] According to an aspect of embodiments of the present invention, the first deformable bladder portion, the second deformable bladder portion, and the deformable supporting portion are of an integral structure.

[0007] According to an aspect of embodiments of the present invention, in the cross-section of the deformable supporting portion in the winding position, the contour of the outer peripheral surface of the deformable supporting portion is circular or elliptical.

[0008] According to an aspect of embodiments of the present invention, both the first deformable bladder portion and the second deformable bladder portion are of a split structure with the deformable supporting portion.

[0009] According to one aspect of the embodiment of the present invention, the deformable supporting portion includes an inner elastic tube and an outer elastic tube which are sleeved with each other, and the first deformable sac portion and the second deformable sac portion are both connected and fixed to the inner elastic tube.

[0010] According to one aspect of an embodiment of the present invention, the outer peripheral surface of the transmission core shaft includes two relatively arranged flat surfaces and two relatively arranged arcuate surfaces, the two flat surfaces are respectively connected to the first deformable sac body part and the second deformable sac body part, and the two arcuate surfaces are respectively connected to the inner surface of the deformable supporting part.

[0011] According to one aspect of an embodiment of the present invention, the first deformable sac body portion and the second deformable sac body portion are connected to each other, the first deformable sac body portion has an input port for conveying a fluid medium, the second deformable sac body portion has an output port for conveying a fluid medium, and the transmission core shaft is provided with an input channel connected to the input port and an output channel connected to the output port.

[0012] According to one aspect of an embodiment of the present invention, the transmission core shaft includes an inner shaft and an outer sleeve that are mutually sleeved and sealed, the inner shaft has a receiving hole, the first deformable sac portion and the second deformable sac portion are respectively connected to the outer sleeve, the input channel and the output channel both pass through the outer sleeve and the inner shaft and are connected to the receiving hole, the winding device also includes an input pipe fitting and an output pipe fitting arranged in the receiving hole, the input pipe fitting and the output pipe fitting are respectively connected to the input channel and the output channel and are sealably connected to the inner shaft or the outer sleeve.

[0013] According to one aspect of an embodiment of the present invention, the winding device also includes a first one-way flow guide and a second one-way flow guide, the first one-way flow guide is arranged in the input channel and located downstream of the input pipe, and the second one-way flow guide is arranged in the output channel and located upstream of the output pipe.

[0014] According to one aspect of an embodiment of the present invention, the transmission core shaft includes a first end face and a second end face arranged opposite to each other along its own axial direction, and the input port and the output port are staggered along the axial direction of the transmission core shaft, wherein the input port is close to the first end face and the output port is close to the second end face.

[0015] According to one aspect of an embodiment of the present invention, the first deformable sac body portion and the second deformable sac body portion are arranged to be isolated from each other, and the first deformable sac body portion and the second deformable sac body portion respectively have a first flow exchange port and a second flow exchange port for conveying a fluid medium, and the transmission core shaft has a first flow exchange channel and a second flow exchange channel respectively connected to the first flow exchange port and the second flow exchange port.

[0016] According to one aspect of the embodiments of the present invention, the deformable supporting portion is an insulating structure.

[0017] According to one aspect of an embodiment of the present invention, the winding device further includes an ear flattening component, the ear flattening component having an air extraction channel that penetrates through the outer peripheral surface of the deformable support portion and forms an air extraction port on the outer peripheral surface.

[0018] According to one aspect of an embodiment of the present invention, the ear flattening component further includes a flow splitting component disposed in the air extraction channel, the flow splitting component being connected to the deformable support portion, and the flow splitting component having two or more flow splitting holes communicating with the air extraction channel.

[0019] According to one aspect of an embodiment of the present invention, the ear flattening component further includes a filtering component disposed in the air extraction channel, the filtering component being disposed downstream of the flow splitting component.

[0020] According to one aspect of an embodiment of the present invention, the drive mandrel includes an inner shaft and an outer shaft sleeve sleeved with each other, the inner shaft having a receiving hole, and the ear flattening component further includes a flattening air extraction pipe member, at least a part of the flattening air extraction pipe member being disposed in the receiving hole and communicating with the air extraction channel, and the flattening air extraction pipe member being hermetically connected to the drive mandrel to seal the air extraction channel.

[0021] The winding device according to an embodiment of the present invention includes a drive mandrel and a deformable structure connected to the drive mandrel. The deformable structure includes a first deformable bladder portion, a second deformable bladder portion, and a deformable support portion. The first deformable bladder portion and the second deformable bladder portion can each expand or contract along the radial direction of the drive mandrel, thereby driving the corresponding portions on the deformable support portion corresponding to the first deformable bladder portion and the second deformable bladder portion to expand or contract synchronously, so as to realize the switching of the deformable support portion between the winding position and the unloading position. The deformable support portion remains in an expanded state at the winding position so that the electrode sheet of the battery cell can be wound around the outer peripheral surface of the deformable support portion. After the winding work is completed, the portions on the deformable support portion corresponding to the first deformable bladder portion and the second deformable bladder portion, the first deformable bladder portion, and the second deformable bladder portion contract synchronously to reduce their own sizes, so as to form a loose fit with the wound battery cell to realize automatic separation of the two, and then the whole winding device is pulled out from the wound battery cell to complete the unloading. Since the friction resistance between the winding device and the electrode sheet of the battery cell is small and it is not easy to have an adhesion phenomenon when the winding device is pulled out from the wound battery cell, the pulling-out process of the winding device is smooth and stable, reducing the possibility of the electrode sheet of the battery cell being taken out together, ensuring the structural integrity of the electrode sheet of the battery cell after winding, not easily occurring loose winding, and effectively improving the yield of the wound battery cell. Description of the Drawings

[0022] The features, advantages, and technical effects of the exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0023] Figure 1 is a schematic structural diagram of a wound battery cell according to an embodiment of the present invention;

[0024] Figure 2 is a schematic cross-sectional structure view of a wound battery cell according to an embodiment of the present invention;

[0025] Figure 3 is a schematic cross-sectional structure view of a winding device in a winding state according to an embodiment of the present invention;

[0026] Figure 4 is Figure 3 a side view structure diagram in the A direction in

[0027] Figure 5 is a side view structure diagram of a winding device in a discharging state according to an embodiment of the present invention;

[0028] Figure 6 is a schematic cross-sectional structure view of a winding device in a winding state according to another embodiment of the present invention;

[0029] Figure 7 is a schematic cross-sectional structure view of a winding device in a winding state according to still another embodiment of the present invention;

[0030] Figure 8 is a schematic cross-sectional structure view of a winding device in a winding state according to yet another embodiment of the present invention;

[0031] Figure 9 is Figure 8 an enlarged view at B in

[0032] Figure 10 is Figure 8 an enlarged view at C in

[0033] Figure 11 is Figure 8 an enlarged view at D in

[0034] In the drawings, the drawings are not drawn to actual scale.

[0035] Marking description:

[0036] 1. Battery cell; 1a. Tab; 1b. Positive electrode plate; 1c. Negative electrode plate; 1d. Separator;

[0037] 10. Winding device;

[0038] 11. Driving mandrel; 11a. Outer peripheral surface; 11b. Input channel; 11c. Output channel; 11e. First end face; 11f. Second end face; 11h. Accommodating hole; 11m. First commutation channel; 11n. Second commutation channel; 110a. Flat surface; 110b. Arc surface; 111. Inner shaft; 112. Outer shaft sleeve;

[0039] 12. Deformable structure; 120. Deformable support portion; 120a. Outer peripheral surface; 120b. Inner elastic cylinder; 120c. Outer elastic cylinder; 121. First deformable bladder portion; 121a. First flow conversion port; 122. Second deformable bladder portion; 122a. Second flow conversion port; 123. Input port; 124. Output port;

[0040] 13. Input pipe fitting;

[0041] 14. Output pipe fitting;

[0042] 15. First one-way flow guiding member;

[0043] 16. Second one-way flow guiding member;

[0044] 17. Sealing member;

[0045] 18. Tab flattening member; 180. Air extraction channel; 181. Flattening air extraction pipe fitting; 182. Shunt member; 182a. Shunt hole; 183. Filter member;

[0046] 20. Coupling;

[0047] 21. Bearing;

[0048] 97. First flow conversion pipe fitting;

[0049] 98. Second flow conversion pipe fitting;

[0050] 99. Connecting pipeline. Detailed implementation manners

[0051] The following further describes in detail the implementation manners of the present invention in conjunction with the accompanying drawings and embodiments. The detailed description and drawings of the following embodiments are used to exemplarily illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments.

[0052] In the description of the present invention, it should be noted that unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0053] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0054] In order to better understand the present invention, Figures 1 to 11 The winding device 10 according to the embodiment of the present invention is described in detail.

[0055] See also Figure 1 and Figure 2 As shown, the rolled battery cell 1 of the embodiment of the present invention is formed by winding the battery cell pole pieces and then shaping them. The battery cell 1 has an epitaxial pole piece 1a. The battery cell pole pieces of the embodiment of the present invention include a positive pole piece 1b, a negative pole piece 1c and a separator 1d. The separator 1d is an insulator between the positive pole piece 1b and the negative pole piece 1c. The positive pole piece 1b and the negative pole piece 1c each have a thin film for conducting electricity, and the thin film of the positive pole piece 1b has a first coating area coated with a positive active material and a positive pole ear that is not coated with a positive active material. The thin film of the negative pole piece 1c has a second coating area coated with a negative active material and a negative pole ear that is not coated with an active material. The battery cell pole pieces are wound and then shaped to form a rolled battery cell 1.

[0056] See also Figure 3 and Figure 4As shown in the figure, an embodiment of the present invention provides a winding device 10 for winding the electrode sheets of an electric core. After being wound by the winding device 10 of this embodiment, the electrode sheets of the electric core are shaped to form a wound electric core 1. The winding device 10 of this embodiment includes a driving mandrel 11 and a deformable structure body 12 sleeved on the driving mandrel 11. Here, the deformability in this embodiment means that the component itself has the performance of being deformable. The deformable structure body 12 includes a deformable supporting portion 120 in a cylindrical structure, a first deformable bladder portion 121, and a second deformable bladder portion 122. Both the first deformable bladder portion 121 and the second deformable bladder portion 122 are arranged inside the deformable supporting portion 120 and are oppositely arranged along the radial direction of the deformable supporting portion 120. The deformable structure body 12 is sleeved outside the driving mandrel 11. The driving mandrel 11 is located between the first deformable bladder portion 121 and the second deformable bladder portion 122, that is, the first deformable bladder portion 121 and the second deformable bladder portion 122 are respectively arranged on opposite sides of the driving mandrel 11. Among them, both the first deformable bladder portion 121 and the second deformable bladder portion 122 can switch between an expanded state and a contracted state, so as to be able to jointly drive the parts corresponding to the first deformable bladder portion 121 and the second deformable bladder portion 122 on the deformable supporting portion 120 to expand or contract along the radial direction of the driving mandrel 11, so that the deformable supporting portion 120 switches between a winding position and a discharging position. When the driving mandrel 11 drives the deformable supporting portion 120 to rotate synchronously at a high speed, the electrode sheets of the electric core can be wound on the outer peripheral surface 120a of the deformable supporting portion 120 in the winding position.

[0057] In one embodiment, the shape of the driving mandrel 11 matches the shape of the space formed between the first deformable bladder portion 121 and the second deformable bladder portion 122, so that the driving mandrel 11 and the deformable structure body 12 can be connected and fixed by an interference fit. In another embodiment, after the driving mandrel 11 is inserted into the deformable structure body 12, the two are connected and fixed by an adhesive bonding method. In this way, the driving mandrel 11 and the deformable structure body 12 are detachably connected to facilitate the replacement or maintenance of the deformable structure body 12 in the later stage.

[0058] In this embodiment, both the first deformable bladder portion 121 and the second deformable bladder portion 122 can be in an expanded state (see Figure 3 and Figure 4 shown) and a contracted state (see Figure 5As shown). The first deformable bladder portion 121 and the second deformable bladder portion 122 that switch between the inflated state and the contracted state respectively drive the portions of the deformable support portion 120 corresponding to the first deformable bladder portion 121 and the second deformable bladder portion 122 to expand or contract radially along the transmission mandrel 11. When the portions of the deformable support portion 120 corresponding to the first deformable bladder portion 121 and the second deformable bladder portion 122 expand or contract radially along the transmission mandrel 11, they can be in the winding position (see Figure 3 and Figure 4 as shown) and the discharging position (see Figure 5 as shown) and switch between them. During the rotation of the transmission mandrel 11, the battery electrode sheets can be continuously wound around the outer peripheral surface 120a of the deformable support portion 120 in the winding position, and finally a wound battery 1 can be formed. After the battery electrode sheet winding process is completed by the winding device 10, the first deformable bladder portion 121 and the second deformable bladder portion 122 are controlled to switch from the inflated state to the contracted state, so as to synchronously drive the deformable support portion 120 to gradually contract radially along the transmission mandrel 11 from the inflated state. The deformable support portion 120 can perform a winding action in the winding position and a discharging action in the discharging position. The deformable support portion 120 in the contracted state of this embodiment is flat, while the deformable support portion 120 in the inflated state is circular or oval. Since the maximum outer diameter dimension of the cross-section of the deformable support portion 120 in the contracted state is smaller than the maximum outer diameter dimension of the cross-section of the deformable support portion 120 in the inflated state, when the deformable support portion 120 switches from the winding position to the discharging position, the tight fit between the outer peripheral surface 120a of the deformable support portion 120 and the wound battery 1 will change to a loose fit. In this way, after the battery electrode sheet winding process is completed by the winding device 10, the deformable structure 12 performs a contraction action to form a loose fit between the deformable support portion 120 and the wound battery 1, thereby reducing the frictional resistance between the outer peripheral surface 120a of the deformable support portion 120 and the wound battery 1, and also reducing the possibility of adhesion between the outer peripheral surface 120a of the deformable support portion 120 and the wound battery 1. Thus, the winding device 10 of this embodiment can be smoothly pulled out from the wound battery 1 to complete the discharging work, thereby reducing the possibility of damaging the structure of the wound battery 1, improving the pulling-out work efficiency of the winding device 10, increasing the yield rate of the wound battery 1, and effectively reducing the production cost.

[0059] In one embodiment, the first deformable bladder portion 121 and the second deformable bladder portion 122 are respectively disposed on opposite sides of the drive mandrel 11 and are symmetrically arranged with respect to the axis of the drive mandrel 11, so that the portions of the deformable support portion 120 corresponding to the first deformable bladder portion 121 and the second deformable bladder portion 122 expand or contract to substantially the same extent, ensuring the consistency of the expansion process or the contraction process of the portions of the deformable support portion 120 corresponding to the first deformable bladder portion 121 and the second deformable bladder portion 122.

[0060] In one embodiment, referring to Figure 3 As shown, the first deformable bladder portion 121, the second deformable bladder portion 122 and the deformable support portion 120 are of an integral structure, ensuring high connection strength among the three. At the same time, it ensures that the expansion or contraction actions of the portions of the first deformable bladder portion 121 and the deformable support portion 120 corresponding to the first deformable bladder portion 121 and the portions of the second deformable bladder portion 122 and the deformable support portion 120 corresponding to the second deformable bladder portion 122 can be synchronized. The first deformable bladder portion 121, the second deformable bladder portion 122 and the deformable support portion 120 can be manufactured by an integral molding method. In one example, the materials of the first deformable bladder portion 121, the second deformable bladder portion 122 and the deformable support portion 120 are all elastic materials such as rubber or silica gel, so that the first deformable bladder portion 121, the second deformable bladder portion 122 and the deformable support portion 120 themselves all have good deformation performance. Optionally, the first deformable bladder portion 121, the second deformable bladder portion 122 and the deformable support portion 120 can be manufactured by an injection molding method.

[0061] In this embodiment, in the cross-section of the deformable support portion 120 in the winding position, the contour of the outer peripheral surface 120a of the deformable support portion 120 is circular or elliptical, so as to ensure that the transition of each region of the outer peripheral surface 120a is smooth, and no stress concentration is formed in the local area of the wound battery core electrode sheet, reducing the possibility of damaging or puncturing the battery core electrode sheet and ensuring the structural integrity of the formed battery core 1.

[0062] In one embodiment, referring to Figure 6 and Figure 7As shown, both the first deformable bladder portion 121 and the second deformable bladder portion 122 are of a split structure with the deformable support portion 120. Optionally, both the first deformable bladder portion 121 and the second deformable bladder portion 122 are detachably connected to the deformable support portion 120, facilitating the removal of the deformable support portion 120 from the first deformable bladder portion 121 and the second deformable bladder portion 122 and the replacement of a new deformable support portion 120, thereby reducing the use and maintenance costs. In one example, both the first deformable bladder portion 121 and the second deformable bladder portion 122 are fixedly connected to the deformable support portion 120 by an adhesive bonding method. The first deformable bladder portion 121, the second deformable bladder portion 122, and the deformable support portion 120 of this embodiment can be processed and manufactured using different materials. In one example, both the first deformable bladder portion 121 and the second deformable bladder portion 122 can be processed and manufactured using rubber or silicone materials, while the deformable support portion 120 can be processed and manufactured using insulating materials such as Teflon (polytetrafluoroethylene), so that the deformable support portion 120 itself has both insulating properties and deformability.

[0063] Further, referring to Figure 8 As shown, the deformable structure 12 includes an inner elastic cylinder 120b and an outer elastic cylinder 120c that are sleeved with each other. Both the first deformable bladder portion 121 and the second deformable bladder portion 122 are fixedly connected to the inner elastic cylinder 120b. The inner elastic cylinder 120b and the outer elastic cylinder 120c of this embodiment are both of an integral cylindrical structure. Both the first deformable bladder portion 121 and the second deformable bladder portion 122 are detachably connected to the inner elastic cylinder 120b. In one example, both the first deformable bladder portion 121 and the second deformable bladder portion 122 are fixedly connected to the inner elastic cylinder 120b by an adhesive bonding method. The inner elastic cylinder 120b of this embodiment can play a role in restraining and shaping the first deformable bladder portion 121 and the second deformable bladder portion 122, thereby ensuring that the structures of the first deformable bladder portion 121 and the second deformable bladder portion 122 are regular when in an inflated state, so that the outer peripheral surface 120a of the outer elastic cylinder 120c is smooth and flat after the deformable support portion 120 expands, and ultimately helps to improve the structural regularity of the wound core 1. The materials of the inner elastic cylinder 120b and the outer elastic cylinder 120c of this embodiment can both be elastic materials such as rubber or silicone.

[0064] Referring to Figure 4 or Figure 5As shown, the outer peripheral surface 11a of the drive mandrel 11 in the embodiment of the present invention includes two oppositely arranged flat surfaces 110a and two oppositely arranged arc surfaces 110b. The drive mandrel 11 in this embodiment has an overall flat structure. The two flat surfaces 110a are respectively connected to the first deformable bladder portion 121 and the second deformable bladder portion 122. The two arc surfaces 110b are respectively connected to the inner surface of the deformable support portion 120. In one example, the two flat surfaces

[0065] 110a of the drive mandrel 11 are respectively detachably connected to the first deformable bladder portion 121 and the second deformable bladder portion 122. For example, the two flat surfaces 110a of the drive mandrel 11 can be respectively connected to the first deformable bladder portion 121 and the second deformable bladder portion 122 by bonding. The two arc surfaces 110b are respectively detachably connected to the inner surface of the deformable support portion 120. For example, the two arc surfaces 110b of the drive mandrel 11 can be respectively connected to the inner surface of the deformable support portion 120 by bonding. In this way, it is convenient to replace the deformable structure 12. Optionally, the drive mandrel 11 is entirely made of a metal material. The arc surface 110b of the drive mandrel 11 is a circular arc surface.

[0066] In one embodiment, refer to Figure 3 or Figure 6As shown, the first deformable bladder portion 121 and the second deformable bladder portion 122 communicate with each other. Optionally, the first deformable bladder portion 121 and the second deformable bladder portion 122 communicate with each other through a connecting pipeline 99. A pipe-embedded groove may be provided on the outer peripheral surface 11a of the drive mandrel 11, and the connecting pipeline 99 is embedded in the pipe-embedded groove to avoid position interference. The number of the connecting pipelines 99 may be one or more than two. The first deformable bladder portion 121 has an input port 123 for conveying a fluid medium. The second deformable bladder portion 122 has an output port 124 for conveying a fluid medium. The drive mandrel 11 has an input channel 11b communicating with the input port 123 and an output channel 11c communicating with the output port 124. In this embodiment, the first deformable bladder portion 121 and the second deformable bladder portion 122 are inflated by filling a fluid medium into the first deformable bladder portion 121 through the input channel 11b and the input port 123. The fluid medium filled in the first deformable bladder portion 121 and the second deformable bladder portion 122 is pumped out through the output channel 11c and the output port 124 to control the contraction of the first deformable bladder portion 121 and the second deformable bladder portion 122. The fluid medium in this embodiment may be a liquid or a gas. Preferably, the fluid medium filled in the first deformable bladder portion 121 and the second deformable bladder portion 122 is a gas. When the fluid medium filled in the first deformable bladder portion 121 and the second deformable bladder portion 122 is a gas, when the winding device 10 is driven by an external driving force to switch from a stopped state to a high-speed rotating state, the damping force of the gas on the whole winding device 10 is small, and it will not apply too large a reverse torque to the first deformable bladder portion 121 and the second deformable bladder portion 122, thus ensuring the smooth start-up process and speed-up process of the winding device 10. At the same time, when the gas leaks, it will not cause pollution to the winding device 10 or other components, improving the use safety of the winding device 10.

[0067] In one embodiment, the transmission mandrel 11 includes a first end face 11e and a second end face 11f that are oppositely arranged along its own axial direction. The input port 123 and the output port 124 included in the deformable bladder portion are arranged offset along the axial direction of the transmission mandrel 11. Among them, the input port 123 is close to the first end face 11e, and the output port 124 is close to the second end face 11f. In this way, when the fluid medium is filled into the first deformable bladder portion 121 through the input port 123, the fluid medium can be filled starting from the internal space of the first deformable bladder portion 121 close to the first end face 11e, ensuring that the portions of the first deformable bladder portion 121 and the second deformable bladder portion 122 close to the first end face 11e expand preferentially, and then gradually expand towards the second end face 11f, improving the smoothness of the expansion process of the first deformable bladder portion 121 and the second deformable bladder portion 122. When the fluid medium filled in the first deformable bladder portion 121 and the second deformable bladder portion 122 is drawn out through the output port 124, the fluid medium can be drawn out starting from the internal space of the second deformable bladder portion 122 close to the second end face 11f, ensuring that the portions of the first deformable bladder portion 121 and the second deformable bladder portion 122 close to the second end face 11f contract preferentially, and then gradually contract towards the first end face 11e, improving the smoothness of the contraction process of the first deformable bladder portion 121 and the second deformable bladder portion 122.

[0068] See Figure 3 As shown, the transmission mandrel 11 of the embodiment of the present invention can be an integral structure.

[0069] See Figure 8 As shown, the transmission mandrel 11 of the embodiment of the present invention can also be a split structure. The transmission mandrel 11 includes an inner shaft 111 and an outer shaft sleeve 112 that are sleeved with each other and sealed and connected. The first deformable bladder portion 121 and the second deformable bladder portion 122 are respectively arranged on opposite sides of the outer shaft sleeve 112 and are both fixedly connected to the outer shaft sleeve 112, so that the outer shaft sleeve 112 separates the inner shaft 111 from the first deformable bladder portion 121 and the inner shaft 111 from the second deformable bladder portion 122. The outer shaft sleeve 112 and the inner shaft 111 of this embodiment can be connected and fixed by an interference fit. The materials of the inner shaft 111 and the outer shaft sleeve 112 of this embodiment can be the same, both being materials such as steel or iron. The materials of the inner shaft 111 and the outer shaft sleeve 112 of this embodiment can also be different. Among them, the inner shaft 111 can be a metal material such as steel or iron, while the outer shaft sleeve 112 can be an engineering plastic.

[0070] See Figures 8 to 10As shown, the inner shaft 111 of this embodiment is provided with a receiving hole 11h. The input channel 11b and the output channel 11c both penetrate through the outer shaft sleeve 112 and the inner shaft 111 and are connected to the receiving hole 11h. The winding device 10 further includes an input pipe fitting 13 and an output pipe fitting 14 disposed in the receiving hole 11h of the inner shaft 111. The input pipe fitting 13 and the output pipe fitting 14 are respectively connected to the input channel 11b and the output channel 11c. In this embodiment, a fluid medium is filled into the first deformable bladder portion 121 and the second deformable bladder portion 122 through the input pipe fitting 13, the input channel 11b, and the input port 123 so that the first deformable bladder portion 121 and the second deformable bladder portion 122 expand, thereby driving partial expansion of the deformable support portion 120 and finally reaching the winding position. The fluid medium inside the first deformable bladder portion 121 and the second deformable bladder portion 122 is drawn out through the output pipe fitting 14, the output channel 11c, and the output port 124 so that the first deformable bladder portion 121 and the second deformable bladder portion 122 contract, thereby driving the portions of the deformable support portion 120 connected to the first deformable bladder portion 121 and the second deformable bladder portion 122 to contract and finally reaching the unloading position. Disposing the input pipe fitting 13 and the output pipe fitting 14 in the receiving hole 11h of the inner shaft 111 is beneficial to improving the overall compactness of the winding device 10. At the same time, the input pipe fitting 13 and the output pipe fitting 14 are closer to the axis of the transmission mandrel 11. Thus, when the winding device 10 rotates at a high speed, the input pipe fitting 13 and the output pipe fitting 14 have less influence on the stability of the entire winding device 10. The input pipe fitting 13 and the output pipe fitting 14 are respectively sealed and connected to the inner shaft 111 or the outer shaft sleeve 112. In one example, the input pipe fitting 13 and the output pipe fitting 14 are respectively sealed and connected to the inner shaft 111 or the outer shaft sleeve 112 through a seal 17. The seal 17 of this embodiment can be an elastic material such as rubber or silica gel. The seal 17 and the input channel 11b or the output channel 11c are hermetically connected by an interference fit. Optionally, a slot is provided on the inner shaft 111 or the outer shaft sleeve 112, and the seal 17 is snapped into the slot, so that the input pipe fitting 13 and the output pipe fitting 14 are respectively hermetically connected to the input channel 11b and the output channel 11c, and at the same time, the position of the seal 17 is restricted and defined. Optionally, the seal 17 is an annular structure with a central hole, so that the seal 17 can be sleeved on the outer periphery of the input pipe fitting 13 or the output pipe fitting 14 to achieve a sealing fit. Optionally, on-off valves are provided on both the input pipe fitting 13 and the output pipe fitting 14 to facilitate control of the opening and closing of the input pipe fitting 13 and the output pipe fitting 14.

[0071] In one embodiment, as shown in Figure 3 the transmission mandrel 11 of the embodiment of the present invention may be an integral structure. The receiving hole 11h is provided at the center of the transmission mandrel 11 and is coaxially arranged with the transmission mandrel 11.

[0072] As shown in Figure 9 andFigure 10 As shown, the winding device 10 of this embodiment further includes a first one-way flow guide member 15 and a second one-way flow guide member 16. The first one-way flow guide member 15 is disposed in the input channel 11b and is located downstream of the input pipe fitting 13. The first one-way flow guide member 15 can prevent the fluid medium filled into the first deformable bladder portion 121 and the second deformable bladder portion 122 from flowing back into the input pipe fitting 13, ensuring the safety and smoothness of the fluid medium filling process, and at the same time preventing the fluid medium in the expanded first deformable bladder portion 121 and the second deformable bladder portion 122 from leaking from the input pipe fitting 13. The second one-way flow guide member 16 is disposed in the output channel 11c and is located upstream of the output pipe fitting 14. The second one-way flow guide member 16 can prevent the fluid medium drawn from the inside of the first deformable bladder portion 121 and the second deformable bladder portion 122 from flowing back into the second deformable bladder portion 122, ensuring the smoothness of the contraction process of the first deformable bladder portion 121 and the second deformable bladder portion 122. Optionally, both the first one-way flow guide member 15 and the second one-way flow guide member 16 are one-way valves or one-way conduction louver structures.

[0073] In another embodiment, refer to Figure 7As shown, the first deformable bladder portion 121 and the second deformable bladder portion 122 are arranged separately from each other, that is, the first deformable bladder portion 121 and the second deformable bladder portion 122 are independent of each other and not connected to each other. The first deformable bladder portion 121 and the second deformable bladder portion 122 respectively have a first fluid exchange port 121a and a second fluid exchange port 122a for conveying a fluid medium. The drive mandrel 11 has a first fluid exchange channel 11m and a second fluid exchange channel 11n that are respectively connected to the first fluid exchange port 121a and the second fluid exchange port 122a. A fluid medium is filled into the deformable bladder portion through the first fluid exchange channel 11m and the first fluid exchange port 121a, or the fluid medium inside the first deformable bladder portion 121 is pumped out. A fluid medium is filled into the deformable bladder portion through the second fluid exchange channel 11n and the second fluid exchange port 122a, or the fluid medium inside the second deformable bladder portion 122 is pumped out. Further, the drive mandrel 11 of this embodiment has a receiving hole 11h extending along its own axial direction. The winding device 10 further includes a first fluid exchange pipe fitting 97 and a second fluid exchange pipe fitting 98 disposed in the receiving hole 11h. The first fluid exchange pipe fitting 97 is connected to the first fluid exchange channel 11m and is sealingly connected to the drive mandrel 11. The second fluid exchange pipe fitting 98 is connected to the second fluid exchange channel 11n and is sealingly connected to the drive mandrel 11. A fluid medium is filled into the first deformable bladder portion 121 through the first fluid exchange pipe fitting 97, the first fluid exchange channel 11m, and the first fluid exchange port 121a, or the fluid medium inside the first deformable bladder portion 121 is pumped out. A fluid medium is filled into the second deformable bladder portion 122 through the second fluid exchange pipe fitting 98, the second fluid exchange channel 11n, and the second fluid exchange port 122a, or the fluid medium inside the second deformable bladder portion 122 is pumped out. The structural design of the above embodiment can facilitate the replacement or repair of the first deformable bladder portion 121 or the second deformable bladder portion 122 separately. In addition, it can also reduce the number of components and reduce the failure rate of the winding device 10. Optionally, both the first fluid exchange pipe fitting 97 and the second fluid exchange pipe fitting 98 are sealingly connected to the drive mandrel 11 through a seal 17.

[0074] The deformable support portion 120 of the embodiment of the present invention is an insulating structure. The material of the deformable support portion 120 can be an insulating elastic material such as rubber, Teflon or plastic, so that the deformable support portion 120 itself not only has insulating properties, but also has a certain stretching and deformation performance. Since the deformable support portion 120 is an insulating structure, static electricity will not be generated during the process of winding the battery cell pole piece, reducing interference and adverse effects on the winding process of the battery cell pole piece. At the same time, it is not easy for the deformable support portion 120 and the battery cell pole piece to adhere to each other, ensuring that the winding device 10 exits smoothly along the exit direction and does not pull out the battery cell pole piece. In the embodiment where the deformable support portion 120 includes an inner elastic tube 120b and an outer elastic tube 120c, the material of the outer elastic tube 120c and the inner elastic tube 120b can both be an insulating elastic material such as rubber, Teflon or plastic.

[0075] See also Figure 8 and Figure 11 As shown, the winding device 10 of the embodiment of the present invention further includes a tab smoothing component 18. The tab smoothing component 18 has an exhaust channel 180. The exhaust channel 180 penetrates the outer peripheral surface 120a of the deformable support portion 120 and forms an exhaust port on the outer peripheral surface 120a. When the winding device 10 winds the cell pole piece and the tab smoothing component 18 is in a working state, the tab 1a of the cell pole piece will be stacked on the outer peripheral surface 120a of the deformable support portion 120 near the tab smoothing component 18. The tab smoothing component 18 can exhaust air from the atmosphere through the exhaust port to form an air field in the space area around the tab 1a, so that the flowing air applies a downward pressure on the tab 1a toward the outer peripheral surface 120a of the deformable support portion 120, so that each layer of the tab 1a is subjected to the centripetal force, so that each layer of the tab 1a can be stacked flatly in sequence, avoiding the tab 1a from folding and structural damage under high-speed rotation.

[0076] The tab smoothing component 18 of this embodiment further includes a diverter component 182 disposed in the air extraction channel 180. The diverter component 182 can be connected to the deformable support portion 120. The diverter component 182 has two or more diverter holes 182a connected to the air extraction channel 180. The diverter holes 182a on the diverter component 182 can control the flow rate of the air, ensuring that the flow rate of the air drawn into each diverter hole 182a is uniform, so that the downward pressure on each area on the tab 1a remains balanced.

[0077] The tab smoothing component 18 of this embodiment further includes a filter component 183 disposed in the air extraction channel 180. The filter component 183 may be connected to the deformable support portion 120. The filter component 183 is disposed downstream of the diverter component 182. The filter component 183 can filter the air before entering the air extraction channel 180, thereby reducing the possibility that foreign matter enters the air extraction channel 180 and blocks the air extraction channel 180.

[0078] The electrode tab of the battery cell in this embodiment has a positive electrode tab and a negative electrode tab. The number of air extraction ports can be two. One air extraction port is arranged at the position corresponding to the positive electrode tab on the deformable supporting part 120, and one air extraction port is arranged at the position corresponding to the negative electrode tab, which are respectively used to apply centripetal force to the positive electrode tab and the negative electrode tab. Optionally, the number of air extraction ports can also be multiple, so that at least two air extraction ports are arranged at the position corresponding to the positive electrode tab on the deformable supporting part 120, and at least two air extraction ports are arranged at the position corresponding to the negative electrode tab, so as to apply greater and more balanced centripetal force to the positive electrode tab and the negative electrode tab.

[0079] The drive mandrel 11 of this embodiment includes an inner shaft 111 and an outer shaft sleeve 112 sleeved with each other. The inner shaft 111 has a receiving hole 11h. The tab flattening member 18 further includes a flattening air extraction pipe member 181. At least a part of the flattening air extraction pipe member 181 is arranged in the receiving hole 11h and is communicated with the air extraction channel 180. Arranging the flattening air extraction pipe member 181 in the receiving hole 11h of the inner shaft 111 is beneficial to improving the overall structural compactness of the winding device 10. Optionally, a switching valve is arranged on the flattening air extraction pipe member 181 to facilitate controlling the opening and closing of the flattening air extraction pipe member 181. The flattening air extraction pipe member 181 is hermetically connected to the drive mandrel 11 to seal the air extraction channel 180. Optionally, the flattening air extraction pipe member 181 can be hermetically connected to the inner shaft 111 or the outer shaft sleeve 112 through a seal 17. In one embodiment, the air extraction channel 180 penetrates through the first deformable bladder portion 121 and the second deformable bladder portion 122, and the number of the flattening air extraction pipe members 181 is one. One flattening pipe member is simultaneously communicated with the part of the air extraction channel 180 penetrating through the first deformable bladder portion 121 and the part of the air extraction channel 180 penetrating through the second deformable bladder portion 122. In another embodiment, the air extraction channel 180 penetrates through the first deformable bladder portion 121 and the second deformable bladder portion 122, and the number of the flattening air extraction pipe members 181 is two. The two flattening pipe members are respectively communicated with the part of the air extraction channel 180 penetrating through the first deformable bladder portion 121 and the part of the air extraction channel 180 penetrating through the second deformable bladder portion 122.

[0080] See Figure 3 As shown, the drive mandrel 11 of this embodiment has a first cylinder protruding from the first end face 11e. The first cylinder can be connected to the coupling 20 so that the external driving component drives the winding device 10 to rotate through the coupling 20. The drive mandrel 11 also has a second cylinder protruding from the second end face 11f. The second cylinder can be connected to the bearing 21 to be supported on the external bracket through the bearing 21.

[0081] The winding device 10 according to an embodiment of the present invention includes a driving mandrel 11 and a deformable structure 12 connected to the driving mandrel 11. The deformable structure 12 includes a first deformable bladder portion 121, a second deformable bladder portion 122, and a deformable support portion 120. The first deformable bladder portion 121 and the second deformable bladder portion 122 can each expand or contract radially along the driving mandrel 11, thereby driving the portions of the deformable support portion 120 corresponding to the first deformable bladder portion 121 and the second deformable bladder portion 122 to expand or contract synchronously, so as to realize the switching of the deformable support portion 120 between the winding position and the unloading position. The deformable support portion 120 maintains an expanded state at the winding position so that the electrode sheet of the battery cell can be wound around the outer peripheral surface 120a of the deformable support portion 120. After the winding work is completed, the portions of the deformable support portion 120 corresponding to the first deformable bladder portion 121 and the second deformable bladder portion 122, the first deformable bladder portion 121, and the second deformable bladder portion 122 contract synchronously to reduce their own sizes, so as to form a loose fit with the wound battery cell 1 to realize automatic separation between the two. Then, the entire winding device 10 is pulled out from the wound battery cell 1 to complete unloading. Since the friction resistance between the winding device 10 and the electrode sheet of the battery cell is small and it is not easy to have an adhesion phenomenon when the winding device 10 is pulled out from the wound battery cell 1, the pulling-out process of the winding device 10 is smooth and stable, reducing the possibility of the electrode sheet of the battery cell being taken out together, ensuring the structural integrity of the electrode sheet of the battery cell after winding, not easily occurring loose winding, and effectively improving the yield of the wound battery cell 1.

[0082] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A winding device for winding the electrode sheets of an electric core, the winding device comprises: a driving mandrel; a deformable structure body, the driving mandrel and the deformable structure body are detachably connected, the deformable structure body includes a deformable supporting part in a cylindrical structure, a first deformable bladder part and a second deformable bladder part, the first deformable bladder part and the second deformable bladder part are both arranged inside the deformable supporting part and are arranged oppositely along the radial direction of the deformable supporting part, the deformable structure body is sleeved outside the driving mandrel, and the driving mandrel is located between the first deformable bladder part and the second deformable bladder part; wherein, both the first deformable bladder part and the second deformable bladder part can switch between an expanded state and a contracted state, so as to be able to jointly drive the parts of the deformable supporting part corresponding to the first deformable bladder part and the second deformable bladder part to expand or contract along the radial direction of the driving mandrel, so that the deformable supporting part switches between a winding position and a discharging position, and the electrode sheets of the electric core can be wound on the outer peripheral surface of the deformable supporting part in the winding position; the first deformable bladder part and the second deformable bladder part are communicated with each other, the first deformable bladder part has an input port for conveying a fluid medium, the second deformable bladder part has an output port for conveying a fluid medium, and the driving mandrel is provided with an input channel communicated with the input port and an output channel communicated with the output port; the driving mandrel includes an inner shaft and an outer shaft sleeve which are sleeved with each other and are hermetically connected, the inner shaft has a receiving hole, the first deformable bladder part and the first deformable bladder part are respectively connected to the outer shaft sleeve, the input channel and the output channel both penetrate through the outer shaft sleeve and the inner shaft and are communicated with the receiving hole, and the winding device further includes an input pipe fitting and an output pipe fitting arranged in the receiving hole, the input pipe fitting and the output pipe fitting are respectively communicated with the input channel and the output channel and are hermetically connected to the inner shaft or the outer shaft sleeve.

2. The winding device according to claim 1, wherein, the first deformable bladder part, the second deformable bladder part and the deformable supporting part are of an integral structure.

3. The winding device according to claim 1, wherein, in the cross section of the deformable supporting part in the winding position, the contour of the outer peripheral surface of the deformable supporting part is circular or elliptical.

4. The winding device according to claim 1, wherein, both the first deformable bladder part and the second deformable bladder part are of a split structure with the deformable supporting part.

5. The winding device according to claim 4, wherein, the deformable supporting part includes an inner elastic cylinder and an outer elastic cylinder which are sleeved with each other, and both the first deformable bladder part and the second deformable bladder part are connected and fixed to the inner elastic cylinder.

6. The winding device according to claim 1, wherein, The outer peripheral surface of the drive mandrel includes two oppositely arranged flat surfaces and two oppositely arranged arc surfaces. The two flat surfaces are respectively connected to the first deformable bladder portion and the second deformable bladder portion, and the two arc surfaces are respectively connected to the inner surface of the deformable support portion.

7. The winding device according to claim 1, wherein, the winding device further includes a first one-way flow guiding member and a second one-way flow guiding member. The first one-way flow guiding member is disposed in the input channel and downstream of the input pipe fitting, and the second one-way flow guiding member is disposed in the output channel and upstream of the output pipe fitting.

8. The winding device according to claim 1, wherein, the drive mandrel includes a first end face and a second end face oppositely arranged along its own axis. The input port and the output port are arranged offset along the axis of the drive mandrel. Among them, the input port is close to the first end face, and the output port is close to the second end face.

9. The winding device according to claim 1, wherein, the deformable support portion is an insulating structure.

10. The winding device according to claim 1, wherein, the winding device further includes an ear flattening member. The ear flattening member has an air extraction channel that penetrates the outer peripheral surface of the deformable support portion and forms an air extraction port on the outer peripheral surface.

11. The winding device according to claim 10, wherein, the ear flattening member further includes a flow dividing member disposed in the air extraction channel. The flow dividing member is connected to the deformable support portion, and the flow dividing member has two or more flow dividing holes communicating with the air extraction channel.

12. The winding device according to claim 11, wherein, the ear flattening member further includes a filtering member disposed in the air extraction channel. The filtering member is disposed downstream of the flow dividing member.

13. The winding device according to claim 10, wherein, the ear flattening member further includes an air extraction pipe for flattening. At least a part of the air extraction pipe for flattening is disposed in the accommodation hole and communicates with the air extraction channel. The air extraction pipe for flattening is hermetically connected to the drive mandrel to seal the air extraction channel.

14. A winding device for winding a battery cell pole piece, the winding device comprises: a drive mandrel; a deformable structure body. The drive mandrel and the deformable structure body are detachably connected. The deformable structure body includes a deformable support portion in a cylindrical structure, a first deformable bladder portion and a second deformable bladder portion. The first deformable bladder portion and the second deformable bladder portion are both disposed inside the deformable support portion and are oppositely arranged along the radial direction of the deformable support portion. The deformable structure body is sleeved outside the drive mandrel, and the drive mandrel is located between the first deformable bladder portion and the second deformable bladder portion; Wherein, both the first deformable bladder portion and the second deformable bladder portion can switch between an inflated state and a contracted state, so as to jointly drive the portions of the deformable support portion corresponding to the first deformable bladder portion and the second deformable bladder portion to expand or contract radially along the transmission mandrel, enabling the deformable support portion to switch between a winding position and a discharging position, and the electrode tab of the battery cell can be wound around the outer peripheral surface of the deformable support portion in the winding position. The first deformable bladder portion and the second deformable bladder portion are arranged separately from each other. The first deformable bladder portion and the second deformable bladder portion respectively have a first fluid flow port and a second fluid flow port for conveying a fluid medium. The transmission mandrel has a first fluid flow channel and a second fluid flow channel respectively communicating with the first fluid flow port and the second fluid flow port.

15. The winding device according to claim 14, characterized in that, the first deformable bladder portion, the second deformable bladder portion and the deformable support portion are of an integral structure.

16. The winding device according to claim 14, characterized in that, in the cross-section of the deformable support portion in the winding position, the contour of the outer peripheral surface of the deformable support portion is circular or elliptical.

17. The winding device according to claim 14, characterized in that, both the first deformable bladder portion and the second deformable bladder portion are of a split structure with the deformable support portion.

18. The winding device according to claim 17, characterized in that, the deformable support portion includes an inner elastic cylinder and an outer elastic cylinder sleeved with each other, and both the first deformable bladder portion and the second deformable bladder portion are connected and fixed to the inner elastic cylinder.

19. The winding device according to claim 14, characterized in that, the outer peripheral surface of the transmission mandrel includes two oppositely arranged flat surfaces and two oppositely arranged arc surfaces. The two flat surfaces are respectively connected to the first deformable bladder portion and the second deformable bladder portion, and the two arc surfaces are respectively connected to the inner surface of the deformable support portion.

20. The winding device according to claim 14, characterized in that, the deformable support portion is an insulating structure.

21. The winding device according to claim 14, characterized in that, the winding device further includes an ear flattening component. The ear flattening component has an air extraction channel, and the air extraction channel penetrates through the outer peripheral surface of the deformable support portion and forms an air extraction port on the outer peripheral surface.

22. The winding device according to claim 21, characterized in that, the ear flattening component further includes a flow splitting component arranged in the air extraction channel. The flow splitting component is connected to the deformable support portion, and the flow splitting component has more than two flow splitting holes communicating with the air extraction channel.

23. The winding device according to claim 22, characterized in that, the ear flattening component further includes a filtering component arranged in the air extraction channel. The filtering component is arranged downstream of the flow splitting component.

24. The winding device according to claim 21, Characterized in that, The drive mandrel includes an inner shaft and an outer shaft sleeve sleeved with each other. The inner shaft has a receiving hole. The tab flattening member further includes a flattening air extraction pipe member. At least a part of the flattening air extraction pipe member is disposed in the receiving hole and is communicated with the air extraction channel. The flattening air extraction pipe member is hermetically connected to the drive mandrel to seal the air extraction channel.

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