Wound electrode assemblies, battery cells, batteries, power consumption devices and wound equipment

Abstract

The present application relates to the field of battery technology, and provides a wound electrode assembly, a battery cell, a battery, a power consumption device and a winding device. The wound electrode assembly includes a plate and a separator attached to the plate and located in the folding region of the plate, the separator losing adhesion with the plate within a preset time. The solution of the present application can improve the performance of the battery.

Description

[Technical field]

[0001] The present application relates to the field of battery technology, and in particular to wound electrode assemblies, battery cells, batteries, power consuming devices and wound equipment. [Background technology]

[0002] With the development of battery technology, the requirements for batteries in various aspects are becoming more and more. For example, in addition to considering performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate, it is also necessary to consider the safety of the battery. The deposition of metal ions in a battery, such as lithium deposition, is one of the main factors that affect the electrical performance and safety performance of a battery. When lithium deposition occurs, not only does it reduce the electrical performance of the battery, but it is also easy to form dendrites as the amount of lithium deposition accumulates, and the dendrites may break through the separator and cause a short circuit in the battery, which may pose a potential safety risk.

[0003] Therefore, how to provide a battery assembly to improve the performance of the battery has become a technical problem that needs to be solved. Summary of the Invention [Problem to be solved by the invention]

[0004] The present application provides a wound electrode assembly, a battery cell, a battery, a power consuming device and a wound device, which can improve the safety performance of the battery. [Means for solving the problem]

[0005] According to a first aspect, the present application provides a wound electrode assembly, the wound electrode assembly including a plate and a separator attached to the plate and located in a folding region of the plate, the separator losing adhesion to the plate within a preset time.

[0006] In the embodiment of the present application, the wound electrode assembly includes a plate and a separator. The separator is attached to the plate and located in the folding area of ​​the plate, thus preventing or reducing ions released from the positive plate from passing through the separator and embedding in the negative plate, thereby avoiding phenomena such as lithium deposition due to lack of vacant positions in the negative plate. The separator loses adhesion with the plate within a preset time, thus avoiding wrinkles in the plate in subsequent processes such as shaping due to the adhesion between the separator and the plate. Therefore, the technical solution of the present application can improve the performance of the battery.

[0007] In one possible implementation, the folding region of the electrode plate includes a first surface and a second surface that are disposed opposite to each other, and the separator is attached to the first surface and / or the second surface of the folding region of the electrode plate, which is advantageous in facilitating the flexible installation of the separator position according to actual needs and in balancing the thickness of the electrode assembly and the separator's isolation effect.

[0008] In one possible implementation, the electrode plate includes a positive plate, and the separator is attached to the first surface and / or the second surface of the bent region of the positive plate. In a wound electrode assembly, for a positive plate and a negative plate at the same circumferential position, the negative plate is closer to the center of the electrode assembly than the positive plate, so that the positive plate has a larger area than the negative plate in the bent region, resulting in a larger number of ions released from the positive plate than the number of vacant positions for accommodating ions in the negative plate. By placing a separator on the first surface and / or the second surface of the bent region of the positive plate, it is possible to prevent ions from passing through the separator, thereby avoiding the occurrence of phenomena such as lithium deposition.

[0009] In one possible embodiment, the electrode assembly includes a positive plate having N laps, and the separator is installed in a 1-5 laps folding region of the positive plate close to the center of the electrode assembly, where N≧5. The farther away from the center position of the electrode assembly, the smaller the area difference between the positive plate and the negative plate in the folding region, and the less likely lithium deposition will occur in the folding region of the negative plate. Therefore, by installing the separator in the 1-5 laps folding region of the positive plate close to the center of the electrode assembly, not only can lithium deposition be avoided, but the thickness of the electrode assembly can also be reduced, thereby reducing the volume of the electrode assembly, which is advantageous for improving the volumetric energy density of the battery.

[0010] In one possible embodiment, the electrode assembly further includes a separator, the separator being located between the positive electrode plate and the negative electrode plate to separate the positive electrode plate and the negative electrode plate, and the separator being connected to the separator. That is, the separator is located between the separator and the electrode plate, and ions pass through the separator to move between the positive electrode plate and the negative electrode plate in a position where the separator is not installed, thereby realizing normal operation of the electrode assembly or the battery.

[0011] In one possible implementation, the separator is used to prevent ions released from the positive plate from passing through the separator, thus avoiding the occurrence of phenomena such as lithium deposition in the bent area of ​​the negative plate, thereby improving the safety of the battery.

[0012] In one possible implementation, the isolation object loses its tackiness within the preset time after being irradiated with light of a preset wavelength range. Thus, irradiation with light of a preset wavelength range can cause the isolation object to lose its tackiness within the preset time.

[0013] In one possible implementation, the separator includes a substrate and a retardation adhesive applied on the substrate, the retardation adhesive is located between the substrate and the electrode plate, and the retardation adhesive loses its adhesiveness within the preset time after being irradiated with light of a preset wavelength range, thereby making the separator lose its adhesiveness with the electrode plate within the preset time. In this way, the retardation adhesive can be used to realize that the separator loses its adhesiveness within a preset time, and this method is easy to implement.

[0014] In one possible implementation, the material of the substrate is at least one of the following: fibers, polymeric polymers, polypropylene, polyethylene, rubber, non-woven fabrics, which are easy to obtain, thereby facilitating the manufacture of the separator.

[0015] In one possible realization, the retardation adhesive is an ultraviolet retardation adhesive or an infrared retardation adhesive, which is easy to obtain, thereby facilitating the manufacture of the separator.

[0016] In one possible implementation, the thickness of the separator is 3 μm to 2 cm. In this way, the performance of the separator and the volume of the electrode assembly can be compatible.

[0017] According to a second aspect, the present application provides a battery cell, the battery cell including a wound electrode assembly according to the first aspect and any one of the possible realizations thereof, and a housing for accommodating the electrode assembly.

[0018] According to a third aspect, the present application provides a battery, the battery including the battery cell of the second aspect and a housing for housing the battery cell.

[0019] According to a fourth aspect, the present application provides a power consuming device, comprising a battery according to the third aspect, said battery being adapted to power said power consuming device.

[0020] According to a fifth aspect, the present application provides a winding device for manufacturing a wound-type electrode assembly, the winding device including a first conveying shaft for conveying an electrode plate to which a separator is attached, and an irradiating device for irradiating the separator attached to the electrode plate to cause the separator to lose adhesion to the electrode plate within a preset time. In this way, the irradiating device irradiates the separator, and the separator loses adhesion to the electrode plate within a preset time, thereby preventing wrinkles in the electrode plate due to adhesion in a subsequent shaping process.

[0021] In one possible implementation, the illumination device is installed inside the first conveying shaft and is used to illuminate the separator when the first conveying shaft conveys the plate. In this way, the illumination device is installed inside the first conveying shaft, thereby saving the space occupied by the illumination device.

[0022] In one possible implementation, the first conveying shaft includes a first half shaft, in which the illumination device is installed in the first half shaft, and a second half shaft connected to the first half shaft, in which a light-transmitting area is installed in the second half shaft, and the light-transmitting area is installed corresponding to the illumination device, so that the light of the illumination device can be emitted through the light-transmitting area. In this way, it is ensured that the light emitted from the illumination device located in the first conveying shaft can be emitted through the light-transmitting area, thereby allowing the isolation object to be illuminated by the illumination device.

[0023] In one possible embodiment, the first and second half shafts are provided with a locking structure, and the first and second half shafts are locked to each other through the locking structure, thus realizing the connection between the first and second half shafts, and not affecting the transportation of the pole plates by the first transport shaft.

[0024] In one possible embodiment, the thickness of the shaft wall of the first and / or second half shaft is 0.5 cm to 18 cm. In this way, the strength and volume of the first and second half shafts can be compatible.

[0025] In one possible implementation, the winding device further includes a control unit and a distance measuring mechanism, the distance measuring mechanism is used to measure a first length, the first length being the length of the plate past the first transport axis, and the control unit is used to control the illumination device to turn on or off based on the first length, thus facilitating instantaneous detection of the insulator and illumination of the insulator.

[0026] In one possible implementation, the winding device further includes a color sensing mechanism, which is used to sense the color of the separator or the plate, and the control unit is used to control the illumination device to turn on or off according to the color sensed by the color sensing mechanism. In this way, the separator can be detected and illuminated in real time.

[0027] In one possible implementation, the control unit, the color sensing mechanism and the distance measuring mechanism are located within the illumination device, thus saving space in the winding machine and at the same time facilitating the manufacture of the illumination device.

[0028] In one possible implementation, the separator is attached to the surface of the positive electrode plate, and the first transport shaft is used to transport the positive electrode plate. In this way, by installing the separator after winding the positive electrode plate, the separator and the negative electrode plate to form an electrode assembly, lithium deposition can be avoided or reduced.

[0029] In one possible implementation, the separator includes a substrate and a retardation adhesive applied on the substrate, the retardation adhesive is located between the substrate and the plate, and the retardation adhesive loses adhesion within the preset time after the irradiation device is irradiated, so that the separator loses adhesion with the plate within the preset time. In this way, the retardation adhesive and the corresponding irradiation device can realize that the separator loses adhesion within the preset time, and this method is easy to implement.

[0030] In one possible implementation, the irradiating device is an ultraviolet or infrared irradiating device, thus facilitating acquisition of the irradiating device.

[0031] In one possible embodiment, the diameter of the first conveying shaft is 1.5 cm to 20 cm. In this way, it is easy to process the first conveying shaft and it is easy to convey the electrode plate by the first conveying shaft.

[0032] In one possible implementation, the thickness of the separator is 3 μm to 2 cm. In this way, the performance of the separator and the volume of the electrode assembly can be compatible.

[0033] In the embodiment of the present application, the wound electrode assembly includes a plate and a separator. The separator is attached to the plate and located in the folding area of ​​the plate, thus preventing or reducing ions released from the positive plate from passing through the separator and getting stuck in the negative plate, thereby avoiding phenomena such as lithium deposition due to lack of vacant space in the negative plate. The separator loses adhesion with the plate within a preset time, thus avoiding wrinkles in the plate in subsequent processes such as shaping due to the adhesion between the separator and the plate. Therefore, the technical solution of the present application can improve the performance of the battery.

[0034] In order to more clearly explain the technical solutions of the embodiments of the present application, the following will briefly describe the drawings that need to be used in the embodiments of the present application. It should be apparent that the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on the drawings without exerting creative efforts. In the drawing section, the drawings are not drawn to scale. [Brief description of the drawings]

[0035] [Figure 1] FIG. 1 is a schematic diagram of an electrode assembly according to an embodiment of the present application. [Diagram 2] FIG. 2 is a plan view of the electrode assembly in FIG. [Diagram 3] FIG. 2 is a front view of the electrode assembly in FIG. [Figure 4] FIG. 2 is a side view of the electrode assembly in FIG. [Diagram 5] FIG. 1 is a schematic diagram of an electrode assembly according to an embodiment of the present application. [Figure 6] FIG. 1 is a schematic diagram of an electrode assembly according to an embodiment of the present application. [Figure 7] FIG. 1 is a schematic diagram of an electrode assembly according to an embodiment of the present application. [Figure 8] FIG. 2 is a schematic diagram of a plate having a separator attached thereto according to one embodiment of the present application. [Figure 9] FIG. 2 is a schematic diagram of a plate having a separator attached thereto according to one embodiment of the present application. [Figure 10] FIG. 1 is a schematic diagram of a battery cell according to one embodiment of the present application. [Figure 11] FIG. 1 is a schematic diagram of a battery according to one embodiment of the present application. [Figure 12] 1 is a schematic diagram of a power consuming device according to one embodiment of the present application; [Figure 13] FIG. 1 is a schematic diagram of a winding device according to an embodiment of the present application. [Figure 14] FIG. 1 is a schematic diagram of a winding device according to an embodiment of the present application. [Figure 15]FIG. 2 is a schematic diagram of the use of a winding device according to one embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] The embodiments of the present application will be described in more detail below in conjunction with the drawings and examples. The detailed description of the following examples and the drawings are for illustrative purposes of the principles of the present application, but are not intended to limit the scope of the present application, i.e., the present application is not limited to the described examples.

[0037] In the description of this application, it should be pointed out that unless otherwise stated, "multiple" means two or more, and the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", and "outer" does not indicate or imply that the indicated device or element must have a particular orientation or be configured and operated in a particular orientation, but is merely for ease of explanation and simplification of the description of this application and should not be understood as a limitation of this application. In addition, terms such as "first", "second", and "third" are used for explanatory purposes only and should not be understood as indicating or implying relative importance. "Perpendicular" is not perpendicular in the strict sense, but has a margin of error. "Parallel" is not parallel in the strict sense, but has a margin of error.

[0038] Any directional terms appearing in the following description are directions shown in the drawings, and are not intended to limit the specific structure of the present application. In the description of the present application, it should be further explained that unless otherwise clearly specified and limited, the terms "attached", "connected" and "connected" should be understood in a broad sense, for example, they may be fixedly connected, detachably connected, or integrally connected, and may be directly connected or indirectly connected via an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0039] The term "and / or" in this application merely describes the relationship between related objects and indicates that three relationships may exist, for example, A and / or B may represent three cases: A alone, A and B in combination, and B alone. Also, the character " / " in this application generally indicates that the related objects before and after are in an "or" relationship.

[0040] In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., but is not limited thereto in the embodiments of the present application. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shape, etc., but is not limited thereto in the embodiments of the present application. Depending on the packaging form, the battery cell is generally divided into three types, namely, a cylindrical battery cell, a rectangular parallelepiped prismatic battery cell, and a pouch battery cell, but is not limited thereto in the embodiments of the present application.

[0041] A battery as referred to in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery pack, etc. A battery generally includes a housing for packaging one or more battery cells. The housing can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0042] The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode plate, a negative electrode plate, and a separator. The battery cell is mainly operated by the movement of metal ions between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode collector and a positive electrode active material layer, and the positive electrode active material layer is applied to the surface of the positive electrode collector, and the collector on which the positive electrode active material layer is not applied protrudes from the collector on which the positive electrode active material layer is applied, and the collector on which the positive electrode active material layer is not applied is called a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive electrode collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The negative electrode plate includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is applied to the surface of the negative electrode collector, the collector on which the negative electrode active material layer is not applied protrudes from the collector on which the negative electrode active material layer is applied, and the collector on which the negative electrode active material layer is not applied is called a negative electrode tab. The material of the negative electrode collector may be copper, and the negative electrode active material may be carbon or silicon, etc. The number of positive electrode tabs is stacked in a plurality, and the number of negative electrode tabs is stacked in a plurality, so that melting does not occur even when a large current is passed through them. The material of the separator may be polypropylene (PP) or polyethylene (PE), etc.

[0043] In order to meet various power demands, a battery may include multiple battery cells, where the multiple battery cells may be connected in series, parallel, or series-parallel, and the series-parallel connection refers to a mixture of series and parallel connections. Optionally, multiple battery cells may be connected in series, parallel, or series-parallel to form a battery module, and multiple battery modules may be connected in series, parallel, or series-parallel to form a battery. That is, multiple battery cells may directly form a battery, or a battery module may be first formed, and then the battery module may form a battery. The battery is further installed in a power consumption device to provide electrical energy for the power consumption device.

[0044] The development of battery technology requires consideration of a wide range of design factors, such as performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate, as well as battery safety. Metal ion deposition in batteries, such as lithium deposition, is one of the main factors that affect the electrical and safety performance of batteries. When lithium deposition occurs, not only does it reduce the electrical performance of the battery, but it also makes it easier for dendrites to form as the amount of lithium deposition accumulates, and the dendrites may break through the separator, causing a short circuit in the battery and posing a potential safety risk.

[0045] The applicant discovered that in a wound electrode assembly, the curvature of the electrode plate is large in the electrode plate bending region near the center of the electrode assembly, and lithium deposition and active material detachment are likely to occur in the electrode plate bending region. In addition, during the electrode assembly shaping process, the gap between the positive and negative electrode plates becomes large in the bending region, which further promotes lithium deposition and the formation of lithium dendrites. All of the above factors are detrimental to improving the performance of the battery.

[0046] According to this, the present application provides a wound-type electrode assembly, which includes a plate and a separator attached to the plate and located in the folding region of the plate, the separator losing adhesion to the plate within a preset time. In this way, it is possible to avoid or reduce the ions released from the positive plate passing through the separator and getting stuck in the negative plate, thereby avoiding phenomena such as lithium deposition due to lack of vacant positions in the negative plate. The separator loses adhesion to the plate within a preset time, thus avoiding wrinkles in the plate in subsequent processes such as shaping due to the adhesion between the separator and the plate. Therefore, the technical solution of the present application can improve the performance of the battery.

[0047] Fig. 1 is a schematic diagram of an electrode assembly according to an embodiment of the present application, Fig. 2 is a plan view of the electrode assembly in Fig. 1, Fig. 3 is a front view of the electrode assembly in Fig. 1, and Fig. 4 is a side view of the electrode assembly in Fig. 1. As shown in Figs. 1 to 4, an embodiment of the present application provides a wound-type electrode assembly 10, which includes a plate 11 and a separator 12.

[0048] The electrode plates 11 include a positive electrode plate 111 and a negative electrode plate 112 .

[0049] The separator 12 is attached to the plate 11 and is located in the folded region 11 b of the plate 11 , where the separator 12 may be attached to the positive plate 111 or the negative plate 112 .

[0050] The bending region 11b refers to a portion that is bent when winding the electrode plate 11. For example, the electrode plate 11 includes a straight region 11a and a bending region 11b, the electrode plate 11 is not bent in the straight region 11a, the electrode plate 11 extends in the straight region 11a along a first direction, for example, the y direction, and the extending direction of the electrode plate 11 changes at both ends of the first direction, that is, the electrode plate 11 is bent in the bending region 11b.

[0051] It should be noted that when the separator 12 is positioned in the folding region 11b of the plate 11, the separator 12 may completely cover the plate 11 in the folding region 11b, or may only partially cover the plate 11 in the folding region 11b.

[0052] The shape of the electrode plate 11 at the folded region 11b may be semicircular, elliptical, or close to semicircular or elliptical.

[0053] The separator 12 will lose adhesion with the plate 11 within a preset time. The preset time is related to the properties of the separator 12 itself, and the preset time may further be specifically set according to actual needs.

[0054] In the process of manufacturing the wound electrode assembly 10, after the insulating material 12 is attached onto the electrode plate 11 by the attachment mechanism, the separator, the positive electrode plate 111, and the negative electrode plate 112 are wound into a substantially elliptical winding core by the winding mechanism, and then the winding core is shaped by the shaping mechanism, thereby completing the manufacture of the wound electrode assembly 10. The preset time may be the period from attachment of the insulating material 12 to the electrode plate 11 to completion of winding core manufacture (before shaping the winding core).

[0055] Before the electrode plate 11 and the separator are wound by the winding mechanism, there is adhesion between the separator 12 and the electrode plate 11, which facilitates fixing the separator 12 at the corresponding position of the electrode plate 11, and after the electrode plate 11 and the separator are completely wound by the winding mechanism, the adhesion between the separator 12 and the electrode plate 11 is lost. During the winding by the winding mechanism, the separator 12 is already fixed at the appropriate position, i.e., fixed at the bent region 11b between the positive electrode plate 111 and the negative electrode plate 112. At this time, the adhesion between the separator 12 and the electrode plate 11 is lost, but the separator 12 does not fall off from the electrode plate 11.

[0056] Optionally, the preset time may be the period from attachment of the separator 12 to the electrode plate 11 to completion of core shaping.

[0057] The separator 12 loses its adhesiveness with the plate 11 within a preset time, and thus the effect of the adhesiveness on the plate 11 can be avoided. For example, the adhesiveness can be used to avoid wrinkles in the plate 11 due to uneven shaping or force application of the plate 11. For example, the adhesive separator 12 can be used to avoid side reactions with the electrolyte in the battery. For example, the adhesive separator 12 can be used to prevent ions, such as sodium ions or lithium ions, from being adsorbed between the separator 12 and the plate 11 to which the separator 12 is attached. All of these are advantageous for improving the service life, energy density, etc. of the battery.

[0058] Optionally, the electrode assembly 10 further includes a tab 114 , which may be connected to a housing that contains the electrode assembly 10 .

[0059] In the embodiment of the present application, the wound electrode assembly 10 includes a plate 11 and a separator 12. The separator 12 is attached to the plate 11 and located in the folded region 11b of the plate 11, so that the ions released from the positive plate 111 can be prevented or reduced from passing through the separator 12 and getting stuck in the negative plate 112, thereby avoiding phenomena such as lithium deposition and sodium deposition caused by a lack of vacant positions in the negative plate 112. The separator 12 loses adhesion with the plate 11 within a preset time, thus avoiding wrinkles of the plate 11 in the process of subsequent shaping, etc., caused by the adhesion between the separator 12 and the plate 11. Therefore, the technical solution of the present application can improve the performance of the battery.

[0060] In one embodiment of the present application, the folding region 11b of the electrode plate 11 includes a first surface 1111 and a second surface 1112 arranged opposite each other, and the separator 12 is attached to the first surface 1111 and / or the second surface 1112 of the folding region 11b of the electrode plate 11.

[0061] The first surface 1111 and the second surface 1112 are disposed opposite to each other along the thickness direction of the electrode plate 11. For the positive electrode plate 111, the first surface 1111 and the second surface 1112 of the positive electrode plate 111 each face the negative electrode plate 112 adjacent to the positive electrode plate 111, and for the negative electrode plate 112, the first surface 1111 and the second surface 1112 of the negative electrode plate 112 each face the positive electrode plate 111 adjacent to the negative electrode plate 112.

[0062] The separator 12 may be attached only to the first surface 1111 of the folding region 11b of the electrode plate 11, or may be attached only to the second surface of the folding region 11b of the electrode plate 11, or may be attached simultaneously to the first surface 1111 and the second surface 1112 of the folding region 11b of the electrode plate 11. In this way, it is easy to select the attachment positions and the number of the separators 12 according to actual needs, thereby making it easy to obtain an electrode assembly 10 with a corresponding thickness according to actual needs and to realize a corresponding insulating effect.

[0063] In one embodiment of the present application, the plate 11 includes a positive plate 111, and the separator 12 is attached to a first surface 1111 and / or a second surface 1112 of the folded region 11b of the positive plate 111.

[0064] In the wound-type electrode assembly 10, for a positive electrode plate 111 and a negative electrode plate 112 that are at the same turn position, the negative electrode plate 112 is closer to the center of the electrode assembly 10 than the positive electrode plate 111. For example, the positive electrode plate 111 in the first turn is farther away from the center of the electrode assembly 10 than the negative electrode plate 112 in the first turn, and it can also be said that the perimeter of the positive electrode plate 111 in the first turn is greater than the perimeter of the negative electrode plate 112 in the first turn.

[0065] The first surface 1111 of the bending region 11b of the positive electrode plate 111 may be a convex surface of the positive electrode plate 111, and the convex surface may be a surface of the positive electrode plate 111 that is away from the negative electrode plate 112 for the positive electrode plate 111 and the negative electrode plate 112 that are at the same circumferential position.

[0066] The second surface 1112 of the folded region 11b of the positive plate 111 may be a concave surface of the positive plate 111, and the concave surface may be the surface of the positive plate 111 facing the negative plate 112 for the positive plate 111 and the negative plate 112 at the same circumferential position.

[0067] In the bent region 11b, for the positive plate 111 and the negative plate 112 at the same circumferential position, the positive plate 111 has a larger area than the negative plate 112, so that the number of ions released from the positive plate 111 is greater than the number of vacant positions for accommodating ions in the negative plate 112. By providing the separator 12 in the bent region 11b of the positive plate 111, it is possible to prevent the ions from passing through the separator 12 and becoming embedded in the negative plate 112, thereby avoiding the occurrence of phenomena such as lithium deposition and sodium deposition.

[0068] 5 is a schematic diagram of an electrode assembly according to an embodiment of the present application. As shown in FIG. 5, the separator 12 is attached to the convex and concave surfaces of the bent region 11b of the positive plate 111. By placing the separator 12 on the convex and concave surfaces of the bent region 11b of the positive plate 111, the separator 12 can be more effectively prevented from passing through the separator 12.

[0069] 6 is a schematic diagram of an electrode assembly according to an embodiment of the present application. As shown in FIG. 6, the separator 12 is attached to the concave surface of the bent region 11b of the positive electrode plate 111. By placing the separator 12 on the concave surface of the bent region 11b of the positive electrode plate 111, lithium deposition and sodium deposition can be avoided in the bent region 11b of the negative electrode plate 112, and at the same time, it is advantageous to reduce the thickness and volume of the entire electrode assembly 10.

[0070] Optionally, the separator 12 may be attached to the concave surface of the bent region 11b of the positive plate 111 and at the same time to the convex surface of the bent region 11b of the positive plate 111. That is, the separator 12 may be attached to the positive plate 111, or may be attached to the positive plate 111 and the negative plate 112 at the same time, for example, by gluing.

[0071] Optionally, the separator 12 is installed on the convex and concave surfaces of the folding region 11b of the negative plate 112, that is, the separator 12 is installed on both the folding region 11b on the two surfaces of the negative plate 112.

[0072] In one embodiment of the present application, the electrode assembly 10 includes a positive electrode plate 111 having N circumferences, and the separator 12 is installed in 1 to 5 circumferential folding regions 11b of the positive electrode plate 111 near the center of the electrode assembly 10, where N≧5.

[0073] The area difference between the positive electrode plate 111 and the negative electrode plate 112 in the folding region 11b becomes smaller the farther from the center of the electrode assembly 10, and lithium deposition becomes less likely to occur in the folding region 11b of the negative electrode plate 112. Therefore, by installing the separator 12 in the folding region 11b of the positive electrode plate 111 for 1 to 5 turns close to the center of the electrode assembly 10, not only can lithium deposition be avoided, but also the thickness of the electrode assembly 10 can be reduced, thereby reducing the volume of the electrode assembly 10, which is advantageous for improving the volumetric energy density of the battery.

[0074] In the electrode assembly 10, the number of turns of the positive electrode plate 111 and the negative electrode plate 112 may be specifically set according to actual needs, and may be set to, for example, 20 to 100 turns.

[0075] 7 is a schematic diagram of an electrode assembly according to an embodiment of the present application. In an embodiment of the present application, as shown in FIG. 7, the electrode assembly 10 further includes a separator 13, which is located between the positive electrode plate 111 and the negative electrode plate 112 to separate the positive electrode plate 111 and the negative electrode plate 112, and the separator 12 is connected to the separator 13.

[0076] Gaps are provided in the separator 13, allowing ions (e.g., lithium ions, sodium ions) to pass through the separator 13 and move between the positive electrode plate 111 and the negative electrode plate 112, thereby enabling the electrode assembly 10 or the battery to operate normally.

[0077] The insulator 12 being connected to the separator 13 may be located between the separator 13 and the electrode plate 11. By installing the insulator 12, it is possible to prevent ions from penetrating the insulator 12 from the positive electrode plate 111, and further, the ions do not penetrate the separator 13 installed corresponding to the insulator 12.

[0078] In the area of ​​the electrode plate 11 other than the bent area 11b or the straight area 11a, ions are desorbed from the positive electrode plate 111, pass through the separator 13, and then can become trapped in the negative electrode plate 112.

[0079] In one embodiment of the present application, the separator 12 is used to prevent ions released from the positive plate 111 from passing through the separator 12. In this way, it is possible to avoid the occurrence of phenomena such as lithium deposition, sodium deposition, etc. in the bent region 11b of the negative plate 112, thereby improving the safety of the battery.

[0080] In one embodiment of the present application, the isolation object 12 loses its adhesiveness within a preset time after being irradiated with light of a preset wavelength range. Thus, the isolation object 12 can be made to lose its adhesiveness within a preset time by being irradiated with light of a preset wavelength range.

[0081] 8 is a schematic diagram of an electrode plate to which a separator is attached according to an embodiment of the present application, and FIG. 9 is a schematic diagram of an electrode plate to which a separator is attached according to an embodiment of the present application. In one embodiment of the present application, as shown in FIG. 8 and FIG. 9, the separator 12 includes a substrate 121 and a retardation adhesive 122 applied on the substrate, the retardation adhesive 122 is located between the substrate 121 and the electrode plate 11, and the retardation adhesive 122 loses its adhesiveness within a preset time after being irradiated with light of a preset wavelength range, thereby making the separator 12 lose its adhesiveness with the electrode plate 11 within a preset time. In this way, the retardation adhesive can be used to realize the separator losing its adhesiveness within a preset time, and this method is easy to implement.

[0082] In one embodiment of the present application, the material of the substrate 121 is at least one of the following: fiber, polymer, polypropylene, polyethylene, rubber, non-woven fabric, which is easy to obtain, thereby facilitating the manufacture of the separator 12.

[0083] For example, the material of the substrate 121 may be polyesters, Teflon, and the like.

[0084] Optionally, substrate 121 is a non-porous substrate, such that ions, such as lithium ions, cannot enter and pass through substrate 121.

[0085] Optionally, the substrate 121 may be a substrate having a certain microporous structure, which may prevent the passage of ions, such as lithium ions.

[0086] In one embodiment of the present application, the retardation adhesive 122 is an ultraviolet retardation adhesive or an infrared retardation adhesive, which is easy to obtain, thereby facilitating the manufacture of the separator 12.

[0087] Optionally, after the retarding adhesive 122 has cured, i.e., been irradiated with ultraviolet or infrared light, it may be possible to prevent the passage of ions, such as lithium ions.

[0088] In one embodiment of the present application, the thickness d1 of the separator 12 is 3 μm to 2 cm. For example, the thickness of the separator 12 may be 3 μm, 100 μm, 0.2 cm, 1 cm, 2 cm, etc.

[0089] By setting the thickness d1 of the separator 12 to 3 μm to 2 cm, it is possible to not only avoid the manufacturing process being complicated due to the separator 12 being too thin, but also to avoid the electrode assembly 10 being too thick due to the separator 12 being too thick. In addition, the appropriate thickness of the separator 12 can further ensure the insulating performance of the separator 12.

[0090] Optionally, the width k of the separator 12 is 0.1 cm to 20 cm, and the width of the separator 12 is a dimension along the folding direction of the electrode plate 11. The width of the separator 12 may be set according to the dimension of the folding region 11b of the electrode plate 11 and specific needs. For example, the width of the separator 12 may be 0.1 cm, 1 cm, 5 cm, 10 cm, 15 cm, 20 cm, etc.

[0091] 10 is a schematic diagram of a battery cell according to an embodiment of the present application. As shown in FIG. 10, the present application provides a battery cell 20, which includes the wound electrode assembly 10 described above and a housing 21 for accommodating the electrode assembly 10.

[0092] 11 is a schematic diagram of a battery according to an embodiment of the present application. As shown in FIG. 11, the present application provides a battery 1, which includes the battery cell 20 described above and a housing 11 for housing the battery cell 20.

[0093] FIG. 12 is a schematic diagram of a power consumption device according to an embodiment of the present application. As shown in FIG. 12, the present application provides a power consumption device 30, which includes the battery 1 described above, and the battery 1 is used to power the power consumption device 30. The power consumption device 30 may be a vehicle, and the vehicle may be a fuel oil vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range extender vehicle, etc. A motor 400, a controller 300, and a battery 1 may be installed inside the vehicle, and the controller 300 is for controlling the battery 1 to power the motor 400. For example, the battery 1 may be installed at the bottom, front, or rear of the vehicle. The battery 1 may be used to power the vehicle. For example, the battery 1 can be an operating power source for the vehicle, and is used in the electric circuit system of the vehicle, for example, for the operating electric energy demand during starting, navigation, and running of the vehicle. In another embodiment of the present application, the battery 1 can be used not only as an operating power source for the vehicle, but also as a drive power source for the vehicle, providing drive power to the vehicle in place of, or in place of, gasoline or natural gas.

[0094] 13 is a schematic diagram of a winding device according to an embodiment of the present application. As shown in FIG. 13, the present application provides a winding device 50 for manufacturing a wound-type electrode assembly 10. The winding device 50 includes a first conveying shaft 51 and an irradiation device 52.

[0095] The first transport shaft 51 is used to transport the electrode plate 11 to which the separator 12 is attached.

[0096] The first conveying shaft 51 can convey the positive electrode plate 111 and can also convey the negative electrode plate 112. The length of the first conveying shaft 51 may be specifically set according to the dimensions of the electrode plate 11, and the present application is not specifically limited thereto.

[0097] The irradiation device 52 is used to irradiate the separator 12 attached to the electrode plate 11, so that the separator 12 loses adhesion to the electrode plate 11 within a preset time.

[0098] In the embodiment of the present application, the irradiating device 52 irradiates the separator 12, so that the separator 12 loses its adhesion with the electrode plate 11 within a preset time, thereby avoiding wrinkles in the electrode plate 11 due to the adhesion in the subsequent shaping process, which is beneficial to improving the performance of the electrode assembly 10 and the battery.

[0099] Fig. 14 is a schematic diagram of a winding device according to an embodiment of the present application. In an embodiment of the present application, as shown in Fig. 14, the irradiation device 52 is installed inside the first conveying shaft 51 and is used to irradiate the separator 12 when the first conveying shaft 51 conveys the electrode plate 11. In this way, the irradiation device 52 is installed inside the first conveying shaft 51, so that the space occupied by the irradiation device 52 can be saved.

[0100] In one embodiment of the present application, the first conveying shaft 51 includes a first half shaft 511 and a second half shaft 512 .

[0101] The irradiation device 52 is installed in the first half shaft 511. That is, the inside of the first half shaft 511 has a hollow structure for accommodating the irradiation device 52.

[0102] Optionally, the irradiation device 52 may be mounted on a rotatable fixed shaft, which is mounted inside the first conveying shaft 51, and the first conveying shaft 51 is driven by the fixed shaft to rotate and convey the electrode plate 11.

[0103] Optionally, the illumination device 52 is connected to the first half shaft 511 through a locking structure. For example, a buckle is provided on the illumination device 52, a locking groove corresponding to the buckle is provided on the first half shaft 511, and the illumination device 52 and the first half shaft 511 are connected to each other by fitting the buckle and the locking groove.

[0104] Optionally, the illumination device 52 may be connected to the first half shaft 511 by means of a built-in bolt or adhesive.

[0105] The second half shaft 512 is connected to the first half shaft 511, and a light-transmitting area 513 is provided on the second half shaft 512. The light-transmitting area 513 is provided corresponding to the irradiation device 52, and allows the light of the irradiation device 52 to be emitted through the light-transmitting area 513.

[0106] The light-transmitting area 513 may be made of a material such as a polymer, an acrylic plate, or organic glass.

[0107] Optionally, second half shaft 512 is made entirely of a transparent material.

[0108] In this embodiment, light emitted from an illumination device 52 located in the first conveying axis 51 can be emitted through the light-transmitting area 513, thereby ensuring that the isolation object 12 can be illuminated by the illumination device 52.

[0109] In one embodiment of the present application, a locking structure 514 is installed on the first half shaft 511 and the second half shaft 512, and the first half shaft 511 and the second half shaft 512 are locked together via the locking structure 514.

[0110] For example, a buckle groove 514a is provided on the inner wall of the first half shaft 511, and a buckle 514b corresponding to the buckle groove 514a is provided on the inner wall of the second half shaft 512, and the first half shaft 511 and the second half shaft 512 are locked together by the locking of the buckle groove 514a and the buckle 514b.

[0111] In this embodiment, the connection between the first half shaft 511 and the second half shaft 512 is realized by the built-in locking structure 514, and the transportation of the electrode plate 11 by the first transport shaft 51 is not affected.

[0112] Optionally, the first half shaft 511 and the second half shaft 512 are connected in a manner such as hinged, glued, bolted, or the like.

[0113] In one embodiment of the present application, the thickness of the shaft wall of the first half shaft 511 and / or the second half shaft 512 is 0.5 cm to 18 cm. In this manner, the structural strength and volume of the first half shaft 511 and the second half shaft 512 can be compatible.

[0114] When the first and second half shafts 511 and 512 are hollow structures, the shaft wall thickness d2 is the maximum distance between the outer wall and the inner wall of the first and second half shafts 511 and 512. Here, the outer wall is the outer surface of the first and second half shafts 511 and 512 that contacts the plate 11, and the inner wall is the inner surface of the first and second half shafts 511 and 512 that contacts the irradiation device 52 or faces the irradiation device 52.

[0115] In one embodiment of the present application, the winding device 50 further includes a control unit 53 and a distance measuring mechanism 54 .

[0116] The distance measuring mechanism 54 is used to measure a first length, which is the length of the electrode plate 11 past the first transport shaft 51 .

[0117] A distance measuring mechanism 54 may be installed on the first conveying shaft 51, thus making it possible to measure the length of the electrode plate 11 conveyed by the first conveying shaft 51.

[0118] Optionally, the distance measuring mechanism 54 can be located a fixed distance away from the first conveying axis 51 and determine the length of the electrode plate 11 past the first conveying axis 51 based on information measured by the distance measuring mechanism 54.

[0119] Optionally, the distance measurement mechanism 54 can also sense the number of tabs and marks on the tabs, etc., and the distance measurement mechanism 54 can determine the position of the separator 12 based on the number of tabs.

[0120] The control unit 53 is used to control the irradiation device 52 to turn on or off based on the first length.

[0121] The separator 12 is placed at a specific position on the plate 11, and based on the first length, it can be determined whether the separator 12 has been transported to the corresponding position of the irradiation device 52.

[0122] For example, when the irradiation device 52 is installed inside the first conveying shaft 51, the control unit 53 can determine whether the electrode plate portion to which the insulator 12 is attached has already been conveyed to the first conveying shaft 51 or is about to be conveyed to the first conveying shaft 51 based on the first length, thereby facilitating the control unit 53 to control the turning on of the irradiation device 52. When the electrode plate portion to which the insulator 12 is attached has already been conveyed and passed the first conveying shaft 51, the control unit 53 can control the irradiation device 52 to be turned off.

[0123] Furthermore, for example, when the irradiation device 52 and the first conveying shaft 51 are installed at different positions, the control unit 53 can control the irradiation device 52 to be turned on or off based on the measurement information of the distance measurement mechanism 54.

[0124] In this embodiment, a distance measuring mechanism 54 and a control unit 53 are provided to facilitate instantaneous detection of the isolating object 12 and illumination of the isolating object 12 .

[0125] Optionally, the shape of distance measuring mechanism 54 may be cylindrical, cubic, elliptical, or the like.

[0126] In one embodiment of the present application, the winding equipment 50 further includes a color sensing mechanism 55, which is used to sense the color of the separator 12 or the electrode plate 11, and the control unit 53 is used to control the irradiation device 52 to be turned on or off based on the color sensed by the color sensing mechanism 55.

[0127] The isolator 12 and the electrode plate 11 may have different colors, and when the color sensing mechanism 55 senses the color of the isolator 12, the control unit 53 can control the illumination device 52 to be turned on. In this way, by installing the color sensing mechanism 55 and the distance measuring mechanism 54, the accuracy of sensing the isolator 12 can be further improved, and the illumination device 52 can be easily controlled to be turned on in real time.

[0128] When the color sensing mechanism 55 senses the color of the plate 11, the control unit 53 can control the illumination device 52 to be turned off.

[0129] In one embodiment of the present application, the control unit 53, the color sensing mechanism 55 and the distance measuring mechanism 54 are installed in the illumination device 52. The illumination device 52 can also be said to be a smart illumination device with distance and color sensing functions. In this way, the space occupied by the winding device 50 can be saved, and at the same time, the manufacturing of the illumination device 52 can be facilitated.

[0130] Optionally, the illumination device 52 is an ultraviolet adaptive timing lamp and can be automatically turned on or off according to preset time intervals.

[0131] 15 is a schematic diagram of the use of a winding device according to an embodiment of the present application. In an embodiment of the present application, as shown in FIG. 15, the separator 12 is attached to the surface of the positive electrode plate 111, and the first conveying shaft 51 is used to convey the positive electrode plate 111.

[0132] 15, the winding device 50 is a device that integrates a first transport shaft 51 and an irradiation device 52. The winding device 50 is used to transport a positive electrode plate 111, and an insulating material 12 is attached to each of two surfaces of the positive electrode plate 111. The two winding devices 50 can irradiate the insulating materials 12 on the two surfaces of the positive electrode plate 111.

[0133] Optionally, a winding device 50 is used to irradiate the separator 12 attached to the positive plate 111, and then the positive plate 111 with the separator 12 attached thereto, the separator 13, and the negative plate 112 are wound and shaped by a roll pin to form a wound electrode assembly 10. Optionally, in the formed wound electrode assembly 10, the separator 12 is located in the folding region 11b of the plate 11.

[0134] In this embodiment, after the positive plate 111, the separator 13 and the negative plate 112 are wound to form the electrode assembly 10, the separator 12 is installed, thereby avoiding or reducing lithium deposition.

[0135] In one embodiment of the present application, the separator 12 includes a substrate 121 and a retardation adhesive 122 applied on the substrate 121, the retardation adhesive 122 is located between the substrate 121 and the plate 11, and the retardation adhesive 122 loses its adhesiveness within a preset time after being irradiated by the irradiating device 52, so that the separator 12 loses its adhesiveness with the plate 11 within a preset time. In this way, the retardation adhesive 122 and the corresponding irradiating device 52 can realize the separator 12 to lose its adhesiveness within a preset time, and this method is easy to implement.

[0136] In one embodiment of the present application, the irradiation device 52 is an ultraviolet lamp irradiation device or an infrared lamp irradiation device. For example, a tube lamp 56 is installed in the irradiation device, and the tube lamp can be an ultraviolet tube lamp or an infrared tube lamp, and the irradiation device 52 can emit ultraviolet light through the ultraviolet tube lamp and emit infrared light through the infrared tube lamp.

[0137] In this embodiment, the illumination device 52 is an ultraviolet light illumination device or an infrared light illumination device, which makes the illumination device 52 easy to obtain.

[0138] In one embodiment of the present application, the diameter d3 of the first conveying shaft 51 is 1.5 cm to 20 cm. For example, the diameter of the first conveying shaft 51 may be 1.5 cm, 2 cm, 3 cm, 5 cm, 10 cm, 15 cm, 20 cm, etc. In this way, the processing of the first conveying shaft 51 is facilitated, and at the same time, the first conveying shaft 51 is facilitated to be installed according to the size of the electrode plate 11, and the conveyance of the electrode plate 11 by the first conveying shaft 51 is facilitated.

[0139] In one embodiment of the present application, the thickness d1 of the separator 12 is 3 μm to 2 cm. In this manner, the performance of the separator 12 and the volume of the electrode assembly 10 can be compatible.

[0140] The present application provides a winding device 50, which includes a first conveying shaft 51 and an irradiation device 52. The first conveying shaft 51 is used to convey the electrode plate 11 to which the separator 12 is attached. The irradiation device 52 is used to irradiate the separator 12 attached to the electrode plate 11, so that the separator 12 loses adhesion to the electrode plate 11 within a preset time. The winding device 50 can manufacture a wound electrode assembly 10, which includes the electrode plate 11 and the separator 12. The separator 12 is attached to the electrode plate 11 and is located in the folding region 11b of the electrode plate 11, thus avoiding or reducing the ions released from the positive electrode plate 111 from passing through the separator and fitting into the negative electrode plate 112, thereby avoiding phenomena such as lithium deposition due to a lack of vacant positions in the negative electrode plate 112. The separator 12 loses adhesion with the electrode plate 11 within a preset time, thus avoiding wrinkles of the electrode plate 11 in the subsequent shaping and other processes due to the adhesion between the separator 12 and the electrode plate 11. Therefore, the technical solution of the present application can improve the performance of the battery.

[0141] Although the present application has been described with reference to the preferred embodiments, various improvements may be made thereto and the elements therein may be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural contradiction, any of the technical features mentioned in each embodiment may be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions included in the claims.

Claims

1. A wound electrode assembly (10), comprising: A plate (11), and a separator (12) attached to the folding region (11b) of the electrode plate (11), the separator (12) losing adhesion to the electrode plate (11) within a preset time.

2. 2. The electrode assembly (10) of claim 1, wherein the folding region (11b) of the plate (11) includes a first surface (1111) and a second surface (1112) that are disposed opposite each other, and the separator (12) is attached to the first surface (1111) and / or the second surface (1112) of the folding region (11b) of the plate (11).

3. The electrode assembly (10) of claim 2, characterized in that the electrode plate (11) includes a positive electrode plate (111), and the separator (12) is attached to the first surface (1111) and / or the second surface (1112) of the folded region (11b) of the positive electrode plate (111).

4. 2. The electrode assembly (10) of claim 1, wherein the electrode assembly (10) includes N positive plates (111), and the separator (12) is installed in 1 to 5 folding regions (11b) of the positive plates (111) near a center of the electrode assembly (10), where N>5.

5. The electrode assembly (10) further includes a separator (13), the separator (13) being located between the positive electrode plate (111) and the negative electrode plate (112) to separate the positive electrode plate (111) from the negative electrode plate (112); 2. The electrode assembly (10) of claim 1, wherein the insulator (12) is connected to the separator (13).

6. 4. The electrode assembly (10) of claim 3, wherein the separator (12) is used to prevent ions emitted from the positive electrode plate (111) from passing through the separator (12).

7. 2. The electrode assembly (10) of claim 1, wherein the standoff (12) loses its tackiness within the preset time period after exposure to light of a preset wavelength range.

8. 2. The electrode assembly (10) of claim 1, wherein the separator (12) comprises a substrate (121) and a retardation adhesive (122) applied on the substrate (121), the retardation adhesive (122) being located between the substrate (121) and the electrode plate (11), and the retardation adhesive (122) losing adhesion within the preset time after being irradiated with light of a preset wavelength range, thereby causing the separator (12) to lose adhesion to the electrode plate (11) within the preset time.

9. 9. The electrode assembly (10) of claim 8, wherein the material of the substrate (121) is at least one of a fiber, a polymer, polypropylene, polyethylene, rubber, and a non-woven fabric.

10. 10. The electrode assembly (10) of claim 8 or 9, wherein the retardation adhesive (122) is an ultraviolet retardation adhesive (122) or an infrared retardation adhesive (122).

11. The electrode assembly (10) of claim 1, characterized in that the thickness (d1) of the separator (12) is between 3 μm and 2 cm.

12. A battery cell (20), An electrode assembly (10) according to claim 1; and a housing (21) for accommodating the electrode assembly (10).

13. A battery (1), comprising: A battery cell (20) according to claim 12; and a housing (11) for housing the battery cell (20).

14. A power consuming device (30), comprising:

14. An electrical power consuming device (30) comprising a battery (1) according to claim 13, the battery (1) being used to power the electrical power consuming device (30).

15. A winding machine (50) for use in manufacturing a wound electrode assembly (10), the winding machine (50) comprising: a first conveying shaft (51) for conveying the electrode plate (11) to which the separator (12) is attached; and an irradiation device (52) for irradiating the insulating material (12) attached to the electrode plate (11) to cause the insulating material (12) to lose adhesion to the electrode plate (11) within a preset time.

16. The winding device (50) according to claim 15, characterized in that the irradiation device (52) is installed inside the first conveying shaft (51) and is used to irradiate the separator (12) when the first conveying shaft (51) conveys the electrode plate (11).

17. The first conveying shaft (51) is a first semi-axis (511) in which the illumination device (52) is installed; The winding device (50) according to claim 15, further comprising: a second half shaft (512) connected to the first half shaft (511), the second half shaft (512) having a light-transmitting region (513) disposed in correspondence with the irradiation device (52) and configured to emit light from the irradiation device (52) through the light-transmitting region (513).

18. The winding device (50) according to claim 17, characterized in that a locking structure (514) is provided on the first half shaft (511) and the second half shaft (512), and the first half shaft (511) and the second half shaft (512) are locked via the locking structure (514).

19. 19. The winding device (50) according to claim 17 or 18, characterized in that the thickness (d2) of the shaft wall of the first half shaft (511) and / or the second half shaft (512) is between 0.5 cm and 18 cm.

20. The winding device (50) further comprises a control unit (53) and a distance measuring mechanism (54); the distance measuring mechanism (54) is used to measure a first length, the first length being the length of the electrode plate (11) passing the first conveying shaft (51); 16. The winding apparatus (50) of claim 15, characterized in that the control unit (53) is used for controlling the irradiation device (52) to be turned on or off based on the first length.

21. The winding device (50) further includes a color sensing mechanism (55), the color sensing mechanism (55) being used to sense the color of the separator (12) or the plate (11); 21. The winding device (50) of claim 20, characterized in that the control unit (53) is used to control the illumination device (52) to be turned on or off based on the color sensed by the color sensing mechanism (55).

22. 22. Winding machine (50) according to claim 21, characterized in that the control unit (53), the color sensing mechanism (55) and the distance measuring mechanism (54) are located within the illumination device (52).

23. The winding device (50) according to claim 15, characterized in that the separator (12) is attached to a surface of a positive electrode plate (111), and the first transport shaft (51) is used to transport the positive electrode plate (111).

24. 16. The winding device (50) of claim 15, wherein the separator (12) comprises a substrate (121) and a retardation adhesive (122) applied on the substrate (121), the retardation adhesive (122) being located between the substrate (121) and the electrode plate (11), and the retardation adhesive (122) losing its adhesion within the preset time after irradiation by the irradiation device (52), thereby causing the separator (12) to lose its adhesion to the electrode plate (11) within the preset time.

25. 16. The winding apparatus (50) according to claim 15, characterized in that the irradiation device (52) is an ultraviolet or infrared lamp irradiation device.

26. 16. The winding device (50) according to claim 15, characterized in that the diameter (d3) of the first conveying shaft (51) is between 1.5 cm and 20 cm.

27. The winding device (50) according to claim 15, characterized in that the thickness (d1) of the separator (12) is between 3 μm and 2 cm.

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