A pole piece gluing device, pole piece gluing process, battery cell, battery and power-consuming device

Abstract

The present application relates to a pole piece gluing device, including a gluing mechanism, the gluing mechanism is used to glue the pole piece along the transmission direction of the pole piece, and form a gluing area on the pole piece; the gluing area is located at the two side edges of the pole piece along the width direction of the pole piece, and the pole piece has a coating area in the middle, the gluing area at least partially overlaps with the coating area, and the gluing area exceeds the pole piece along the width direction of the pole piece. In the present application, the two side edges of the pole piece are glued along the transmission direction of the pole piece, and the gluing area exceeds the width of the pole piece, so that the tape attached to the pole piece exceeds the width of the pole piece, and the excess part of the tape is folded so that the tape covers the end faces on both sides of the pole piece, thereby isolating the burrs on the end faces, and preventing the burrs on the end faces of the pole piece from piercing the diaphragm during subsequent coating to cause a short circuit, thereby affecting the performance of the battery.

Description

Technical Field

[0001] The present application relates to the technical field of lithium secondary batteries, and in particular to a pole piece gluing device, a pole piece gluing process, a battery cell, a battery and an electrical device. Background Art

[0002] As people pay more attention to new energy, power batteries have been widely used and developed in the existing market, and along with it come the requirements for the performance and quality of power batteries.

[0003] During the manufacturing process of power batteries, pole pieces need to be stacked or wound. However, when the pole pieces are punched, laser or die cut, burrs are easily formed on the cut end faces of the pole pieces. The burrs will pierce the diaphragm during the subsequent lamination, causing a short circuit in the battery, which will affect the performance of the power battery. Summary of the invention

[0004] Based on this, it is necessary to provide a pole piece gluing device, a pole piece gluing process, a battery cell, a battery and an electrical device to address the problem that burrs on the pole piece pierce the battery separator and cause a battery short circuit.

[0005] In a first aspect, the present application provides a pole piece gluing device, comprising a gluing mechanism, wherein the gluing mechanism is used to gluing the pole piece along a transmission direction of the pole piece and forming a gluing area on the pole piece;

[0006] The pole piece has a coating area in the middle, and the glue area is located on both sides of the coating area along the width direction of the pole piece and at least partially overlaps with the coating area;

[0007] Wherein, the glue-sticking area extends out of the pole piece along the width direction of the pole piece.

[0008] Since the adhesive tape can extend beyond the pole piece, folding the tape extending beyond the width of the pole piece can cover and insulate the cut end face of the pole piece, thereby preventing the burrs on the cut end face from piercing the diaphragm during the subsequent coating process and causing a battery short circuit, thereby improving the safety performance of the battery.

[0009] In some embodiments, the gluing mechanism includes a first gluing component and a second gluing component respectively located on both sides of the pole piece in a direction perpendicular to the pole piece, the first gluing component is used to glue the front side of the pole piece, and the second gluing component is used to glue the back side of the pole piece.

[0010] The first gluing assembly and the second gluing assembly can glue the front and back sides of the pole piece at the same time, thereby improving the gluing efficiency of the pole piece.

[0011] In some embodiments, the first glue laminating assembly includes a first unwinding wheel and a first glue pressing roller, and the second glue laminating assembly includes a second unwinding wheel and a second glue pressing roller, the first unwinding wheel and the second unwinding wheel are respectively arranged at intervals from the pole piece in a direction perpendicular to the pole piece, and the first glue pressing roller and the second glue pressing roller are arranged on both sides of the pole piece relative to each other in a direction perpendicular to the pole piece to press the tape onto the pole piece.

[0012] The first unwinding wheel and the second unwinding wheel can unwind the tape on the front and back of the electrode respectively, so as to glue the front and back of the electrode at the same time. In addition, the first glue pressing roller and the second glue pressing roller can also tighten the unwinding tape while laminating the tape to the electrode to ensure that the tape remains flat when laminating on the electrode.

[0013] In some embodiments, the first unwinding wheel and the second unwinding wheel each include two wheels spaced apart along the width direction of the pole piece and correspondingly arranged at both side edges of the pole piece along its width direction, and the two first unwinding wheels and the two second unwinding wheels correspond to the four glue laminating areas respectively.

[0014] The four glue sticking areas are respectively located on the front and back sides of the pole piece. By unwinding simultaneously with two first unwinding wheels and two second unwinding wheels, glue sticking can be achieved in the four glue sticking areas at the same time, thereby improving the glue sticking efficiency.

[0015] In some embodiments, the width of the adhesive area is 2 mm. The adhesive area of ​​this width can intersect with the coating area, and a portion of the adhesive area can extend out of the pole piece, so as to cover the cut end face of the pole piece.

[0016] In some embodiments, the pole piece gluing device includes a deviation correction mechanism, and the deviation correction mechanism is transmission-connected to the gluing mechanism to drive the gluing mechanism and the pole piece to generate relative displacement.

[0017] The deviation correction mechanism can detect the position deviation of the pole piece, thereby driving the glue sticking mechanism to move accordingly, so that the tape can be accurately attached to the glue sticking area.

[0018] In some embodiments, the correction mechanism includes a fixed bracket and a correction screw disposed on the fixed bracket, the correction screw is transmission-connected to the gluing mechanism, and the correction screw can controllably drive the gluing mechanism to move in the width direction of the pole piece.

[0019] The gluing mechanism can be driven to move along the width direction of the pole piece by the deviation-correcting screw rod, so that the gluing mechanism can be aligned with the gluing area.

[0020] In some embodiments, the correction mechanism includes a photoelectric sensor, which is arranged at the edge of the pole piece to detect the position of the pole piece in its width direction. The photoelectric sensor can detect the actual position of the pole piece in real time, so as to drive the glue sticking mechanism to move through the correction screw rod, thereby controlling the glue sticking position.

[0021] In a second aspect, the present application provides a pole piece gluing process, which uses the pole piece gluing device as described above to perform gluing, including the steps of:

[0022] Calibration, detecting the position of the pole piece by the deviation correction mechanism, and driving the gluing mechanism to generate relative displacement with the pole piece so as to align with the gluing area on the pole piece;

[0023] Gluing: gluing the glue area by means of the gluing mechanism.

[0024] In some embodiments, the calibration step specifically includes:

[0025] Using the photoelectric sensor to detect the position of the pole piece in the width direction thereof, and determining the position offset of the pole piece in the width direction thereof;

[0026] The deflection-correcting screw drives the gluing mechanism to move along the width direction of the pole piece according to the position offset, so that the gluing mechanism is aligned with the gluing area.

[0027] In some embodiments, the gluing step specifically includes:

[0028] The first unwinding wheel unwinds on the front side of the pole piece, and the first glue pressing roller performs glue pressing along the transmission direction of the pole piece;

[0029] The second unwinding wheel unwinds on the back side of the pole piece, and the second glue pressing roller performs glue pressing along the transmission direction of the pole piece.

[0030] In some embodiments, after the gluing step, the method further comprises the following steps:

[0031] Encapsulating with adhesive, folding the adhesive tape in the adhesive area that exceeds the width of the pole piece so as to encapsulate the edge of the pole piece in the adhesive tape.

[0032] In a third aspect, the present application provides a battery cell, including a pole piece manufactured by the pole piece gluing process as described above.

[0033] In a fourth aspect, the present application provides a battery, comprising a housing and the battery cell as described above, wherein the battery cell is disposed in the housing.

[0034] In a fifth aspect, the present application provides an electrical device, including an electrical main body and the battery as described above.

[0035] The above-mentioned pole piece gluing device, pole piece gluing process, battery cell, battery and electrical device glue the edges of both sides of the pole piece along the transmission direction of the pole piece, and the gluing area exceeds the width of the pole piece, so that the tape attached to the pole piece exceeds the width of the pole piece, and the excess part of the tape is folded so that the tape covers the end faces on both sides of the pole piece, thereby isolating the burrs on the end faces, preventing the burrs on the end faces of the pole piece from piercing the diaphragm during subsequent coating to cause a short circuit, thereby affecting the performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of the structure of a vehicle in one embodiment of the present application;

[0037] Figure 2 This is a schematic diagram of the exploded structure of a battery in one embodiment of the present application;

[0038] Figure 3 This is a schematic diagram of the exploded structure of a battery cell in one embodiment of the present application;

[0039] Figure 4 This is a schematic diagram of the overall structure of a pole piece gluing device in one embodiment of the present application;

[0040] Figure 5 for Figure 4 A plan view of a pole piece gluing device is shown;

[0041] Figure 6 for Figure 4 A plan view of a pole piece gluing device is shown;

[0042] Figure 7 for Figure 6 A partial enlarged view of the middle A;

[0043] In the figure: 100-vehicle, 200-electrode piece gluing device, 10-battery, 20-controller, 30-motor, 40-gluing mechanism, 50-correcting mechanism, 11-box, 12-battery cell, 41-gluing area, 42-first gluing assembly, 43-second gluing assembly, 51-fixing bracket, 52-correcting screw, 53-photoelectric sensor, 111-first part, 112-second part, 121-end cover, 122-shell, 123-battery cell assembly, 231-electrode piece, 421-first unwinding wheel, 422-first glue pressing roller, 431-second unwinding wheel, 432-second glue pressing roller, 2311-coating area, 2312-blank area, 121a-electrode terminal, 123a-electrode ear. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0045] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0050] At present, from the perspective of market development, power batteries are widely used in electric vehicles and consumer electronics due to their advantages of high energy density, high output power, long cycle life and low environmental pollution. With the continuous expansion of power battery application areas, the market demand is also constantly expanding.

[0051] The production process of power batteries usually includes the following steps: the first step is electrode slurry preparation, which mainly involves mixing electrode active materials, binders, solvents, etc. together, and forming a slurry after sufficient stirring and dispersion; the second step is coating, which involves evenly coating the slurry prepared in the first step on the current collector (aluminum foil or copper foil, etc.) with a specified thickness, and drying the solvent; the third step is electrode punching, which involves punching the electrode produced in the previous step into a specified size and shape; the fourth step is lamination, which involves assembling the anode and cathode electrodes and diaphragms together, and forming a pole core after gluing; the fifth step is battery assembly, which involves installing the pole core produced in the previous step into a shell with a punched hole, and completing top sealing, side sealing, etc. (a hole must also be left for liquid injection) to form an uninjected battery; the sixth step is liquid injection, which involves injecting a specified amount of electrolyte into the battery cell; the seventh step is battery sealing, which involves extracting the gas inside the battery cell in a vacuum environment and completing the sealing.

[0052] During the above-mentioned electrode punching process, burrs are easily formed on the cut end surface of the electrode after the electrode is cut by laser or mold. When the battery cell composed of the electrode is subsequently coated, the diaphragm is easily pierced by the burrs on the end surface of the electrode, thereby causing a short circuit in the battery cell.

[0053] The applicant has noticed that the existing coating process is to apply a layer of AT11 ceramic slurry to the pole piece through an extrusion device. Since the AT11 ceramic slurry is in a fluid state, the pole piece is required as its carrier during the coating process. Therefore, in the process of coating the pole piece with AT11 ceramic slurry, only the side of the pole piece extending along its width direction can be coated, and the side of the pole piece along its thickness direction cannot be coated. This will cause the side of the pole piece in the thickness direction, that is, the cut end face of the pole piece, to be exposed. As a result, during the subsequent coating, the burrs on the cut end face will pierce the diaphragm and cause a short circuit in the battery.

[0054] In order to prevent the burrs on the end face of the pole piece from piercing the diaphragm, the applicant has found that a layer of isolation medium can be added to the cut end face of the pole piece to cover the cut end face, thereby isolating the burrs within the isolation medium.

[0055] However, it is obviously impossible to achieve this goal by using the existing AT11 ceramic slurry. Based on this, the applicant has found that a PE film, a PP film or a similar film structure can be used to apply film to the electrode. In addition, when applying the film, the film is extended beyond the electrode by a certain width, and the excess part is attached to the cut end face of the electrode to wrap the burr inside, thereby preventing the battery from short-circuiting.

[0056] Based on the above considerations, in order to solve the problem that the burrs on the cut end face of the electrode piece can easily pierce the diaphragm and cause a short circuit in the battery, the inventor has designed a glue sticking device after in-depth research. By sticking a specific tape on the electrode piece and extending the tape sticking area beyond the width of the electrode piece by a certain distance, the excess tape can be stuck on the cut end face of the electrode piece, thereby isolating the burrs, thereby avoiding a short circuit in the battery due to the burrs piercing the diaphragm and improving the performance of the battery.

[0057] The battery cell disclosed in the embodiment of the present application can be used in, but not limited to, electric devices such as vehicles, ships or aircraft. A power supply system comprising the battery cell and battery disclosed in the present application can be used to form the electric device, which is helpful to alleviate the battery short circuit problem caused by the burr of the pole piece piercing the battery diaphragm, and improve the stability of battery performance and battery life.

[0058] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0059] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0060] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 100 provided for some embodiments of the present application. The vehicle 100 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 10 is provided inside the vehicle 100, and the battery 100 may be provided at the bottom, head or tail of the vehicle 100. The battery 10 can be used to power the vehicle 100, for example, the battery 10 can be used as an operating power source for the vehicle 100. The vehicle 100 may also include a controller 20 and a motor 30, and the controller 20 is used to control the battery 10 to power the motor 30, for example, for starting, navigating and driving the vehicle 100.

[0061] In some embodiments of the present application, the battery 10 can be used not only as an operating power source for the vehicle 100 , but also as a driving power source for the vehicle 100 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100 .

[0062] Please refer to Figure 2 , Figure 2 An exploded view of a battery 10 provided for some embodiments of the present application. The battery 10 includes a housing 11 and a battery cell 12, and the battery cell 12 is contained in the housing 11. The housing 11 is used to provide a storage space for the battery cell 12, and the housing 11 can adopt a variety of structures. In some embodiments, the housing 11 may include a first portion 111 and a second portion 112, and the first portion 111 and the second portion 112 cover each other, and the first portion 111 and the second portion 112 jointly define a storage space for accommodating the battery cell 12. The second portion 112 may be a hollow structure with one end open, and the first portion 111 may be a plate-like structure, and the first portion 111 covers the open side of the second portion 112, so that the first portion 111 and the second portion 112 jointly define a storage space; the first portion 111 and the second portion 112 may also be hollow structures with one side open, and the open side of the first portion 111 covers the open side of the second portion 112. Of course, the box body 11 formed by the first part 111 and the second part 112 can be in various shapes, such as a cylinder, a cuboid, etc.

[0063] In the battery 10, there can be multiple battery cells 12, and the multiple battery cells 12 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 12 are both connected in series and in parallel. The multiple battery cells 12 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 12 is accommodated in the box 11; of course, the battery 10 can also be a battery module formed by connecting multiple battery cells 12 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 11. The battery 10 can also include other structures, for example, the battery 10 can also include a busbar component for realizing electrical connection between the multiple battery cells 12.

[0064] Each battery cell 12 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 12 may be cylindrical, flat, rectangular, or in other shapes.

[0065] Please refer to Figure 3 , Figure 3 The schematic diagram of the decomposed structure of the battery cell 12 provided in some embodiments of the present application. The battery cell 12 refers to the smallest unit that constitutes the battery. Figure 3 The battery cell 12 includes an end cover 121, a shell 122, a battery cell assembly 123 and other functional components.

[0066] The end cap 121 refers to a component that covers the opening of the shell 122 to isolate the internal environment of the battery cell 12 from the external environment. Without limitation, the shape of the end cap 121 can be adapted to the shape of the shell 122 to match the shell 122. Optionally, the end cap 121 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 121 is not easily deformed when it is squeezed and collided, so that the battery cell 12 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 121a can be provided on the end cap 121. The electrode terminal 121a can be used to electrically connect to the battery cell assembly 123 for outputting or inputting the electrical energy of the battery cell 12. In some embodiments, the end cap 121 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 12 reaches a threshold. The material of the end cap 121 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the end cap 121, and the insulating member may be used to isolate the electrical connection components in the housing 22 from the end cap 121 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0067] The shell 122 is a component used to cooperate with the end cover 121 to form the internal environment of the battery cell 12, wherein the formed internal environment can be used to accommodate the battery cell assembly 123, electrolyte and other components. The shell 122 and the end cover 121 can be independent components, and an opening can be set on the shell 122, and the internal environment of the battery cell 12 is formed by covering the opening with the end cover 121 at the opening. Without limitation, the end cover 121 and the shell 122 can also be integrated. Specifically, the end cover 121 and the shell 122 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 122, the end cover 121 covers the shell 122. The shell 122 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 122 can be determined according to the specific shape and size of the battery cell assembly 123. The shell 122 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special limitation on this.

[0068] The battery cell assembly 123 is a component in the battery cell 10 where electrochemical reactions occur. One or more battery cell assemblies 123 may be contained in the housing 122. The battery cell assembly 123 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the battery cell assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 123a. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 23a connects the electrode terminals to form a current loop.

[0069] According to some embodiments of this application, please refer to Figure 4 , and please refer to Figures 4 to 7 , Figure 4 The overall structure diagram of the electrode gluing device in one embodiment of the present application is shown. Figure 5 and Figure 6 The schematic diagram of the planar structure of the pole piece gluing device in one embodiment of the present application is shown. Figure 7 Shows Figure 6 For ease of description, the accompanying drawings only show structures related to the embodiments of the present application.

[0070] An embodiment of the present application provides a pole piece gluing device 200, comprising a gluing mechanism 40. The gluing mechanism 40 is used to glue the pole piece 231 along the transmission direction of the pole piece 231, and form a gluing area 41 on the pole piece 231. The pole piece 231 has a coating area 2311 in the middle, and the gluing area 41 is located on both sides of the coating area 2311 along the width direction of the pole piece 231, and at least partially overlaps with the coating area 2311. In addition, the gluing area 41 extends out of the pole piece 231 along the width direction of the pole piece 231.

[0071] Specifically, during the manufacturing process of the electrode 231, the coating is first performed at the center position in the width direction of the electrode 231, and there is a certain blank area 2312 between the coating area 2311 and the edge of the electrode 231. In addition, the coating area 2311 is thinned on both sides close to the edge of the electrode 231, that is, the thickness of the coating area 2311 close to both sides of the blank area 2312 gradually decreases toward the blank area 2312, and this transition area is called the coating edge thinning area.

[0072] Furthermore, the adhesive area 41 partially overlaps with the thinned area at the edge of the coating, so that a portion of the tape attached to the electrode 231 covers the thinned area at the edge of the coating, thereby avoiding a gap between the tape and the coating area 2311 to expose the electrode 231.

[0073] In this specific embodiment, the tape material used is a PE film or a PP film, that is, the PE film or the PP film is attached to the adhesive area 41. Since the adhesive area 41 extends out of the electrode 231 along the width direction of the electrode 231, that is, a part of the PE film or the PP film attached to the electrode 231 is suspended and exceeds the width of the electrode 231. The extended part of the PE film or the PP film can be folded to form a coating on the cut end face of the electrode 231, thereby playing a role in physically isolating the burrs.

[0074] By using the above-mentioned gluing mechanism 40 to glue the pole piece 231, not only the surface where the pole piece coating area 2311 is located can be glued and insulated, but also the cut end surface of the pole piece 231 can be glued and insulated, so that the burrs on the cut end surface can be covered with tape to prevent the burrs from piercing the diaphragm during the subsequent coating process and causing a battery short circuit.

[0075] In some embodiments, the gluing mechanism 40 includes a first gluing component 42 and a second gluing component 43 respectively located on both sides of the pole piece 231 in a direction perpendicular to the pole piece 231. The first gluing component 42 is used to glue the front side of the pole piece 231, and the second gluing component 43 is used to glue the back side of the pole piece 231.

[0076] Compared with the prior art using AT11 ceramic slurry, since the present application uses solid materials such as PE film or PP film, it is possible to glue the front and back sides of the electrode 231 at the same time, thereby improving the glue sticking efficiency.

[0077] In some embodiments, the first glue assembly 42 includes a first unwinding wheel 421 and a first glue pressing roller 422, and the second glue assembly 43 includes a second unwinding wheel 431 and a second glue pressing roller 432. The first unwinding wheel 421 and the second unwinding wheel 431 are respectively arranged at intervals from the pole piece 231 in a direction perpendicular to the pole piece 231, and the first glue pressing roller 422 and the second glue pressing roller 432 are arranged on both sides of the pole piece 231 in a direction perpendicular to the pole piece 231 to press the tape onto the pole piece 231.

[0078] The first unwinding wheel 421 and the second unwinding wheel 431 are respectively located on the front and back of the pole piece 231, and unwind respectively. The first glue pressing roller 422 and the second glue pressing roller 432 are respectively arranged on the front and back of the pole piece 231, and the positions of the first glue pressing roller 422 and the second glue pressing roller 432 are arranged corresponding to each other. During the gluing process, the pole piece 231 is transported along the transmission direction at a fixed speed. At the same time, the first unwinding wheel 421 and the second unwinding wheel 431 unwind at the same speed as the transmission speed of the pole piece 231. The first glue pressing roller 422 and the second glue pressing roller 432 press the tape to the gluing area 41 on the pole piece 231 during the rolling process.

[0079] Furthermore, the first unwinding wheel 421 and the second unwinding wheel 431 each include two wheels spaced apart along the width direction of the pole piece 231 and correspondingly disposed at both side edges of the pole piece 231 along the width direction thereof. The two first unwinding wheels 421 and the two second unwinding wheels 431 correspond to the four glue laminating areas 41 respectively.

[0080] Specifically, the front side of the pole piece 231 has two glue sticking areas 41, and the back side also has two glue sticking areas 41, and the two glue sticking areas 41 on the front and back sides are respectively located at the two side edges of the pole piece 231. The two first unwinding wheels 421 rotate coaxially, and the two second unwinding wheels 431 rotate coaxially to achieve unwinding at the same speed, so that the glue sticking speed of the four glue sticking areas 41 can be kept consistent.

[0081] In addition, the length of the first glue pressing roller 422 and the second glue pressing roller 432 is not less than the width of the pole piece 231. Therefore, by respectively arranging the first glue pressing roller 422 and the second glue pressing roller 432 on the front and back of the pole piece 231, the synchronous glue application of the four glue application areas 41 can be achieved. While implementing the glue application, the first glue pressing roller 422 and the second glue pressing roller 432 can also tension the unwound adhesive tape to ensure that the adhesive tape remains flat when it is applied to the pole piece 231.

[0082] Specifically in this embodiment, the width of the adhesive area 41 is 2 mm, that is, the widths of the two adhesive areas 41 on the front of the pole piece 231 and the two adhesive areas 41 on the back of the pole piece 231 are 2 mm respectively. The adhesive area 41 of this width can intersect with the thinned area of ​​the coating edge, and can also partially extend out of the pole piece 231, so as to cover the cut end face of the pole piece 231.

[0083] In order to improve the gluing accuracy of the pole piece 231 , the pole piece gluing device 200 includes a deviation correction mechanism 50 , which is transmission-connected to the gluing mechanism 40 to drive the gluing mechanism 40 and the pole piece 231 to generate relative displacement.

[0084] In the specific gluing process, due to the error in the operation of the machine, a certain position offset will be generated in the width direction during the transmission of the pole piece 231. Therefore, in order to avoid the offset of the gluing position caused by the offset of the pole piece 231, a correction mechanism 50 is provided and is connected to the gluing mechanism 40. The correction mechanism 50 can detect the position offset of the pole piece 231, thereby driving the gluing mechanism 40 to move accordingly, so that the tape can be accurately attached to the gluing area 41.

[0085] In some embodiments, the correcting mechanism 50 includes a fixed bracket 51 and a correcting screw 52 arranged on the fixed bracket 51. The correcting screw 52 is transmission-connected to the gluing mechanism 40. The correcting screw 52 can controllably drive the gluing mechanism 40 to move in the width direction of the pole piece 231.

[0086] Specifically in this embodiment, the deflection-correcting screw 52 and the gluing mechanism 40 are both fixed on the fixed bracket 51. Driven by an external driving mechanism (not shown in the figure), the deflection-correcting screw 52 can drive the gluing mechanism 40 to move along the width direction of the pole piece 231, so that the gluing mechanism 40 can be aligned with the gluing area 41.

[0087] Furthermore, the deviation correction mechanism 50 includes a photoelectric sensor 53 , which is disposed at the edge of the pole piece 231 to detect the position of the pole piece 231 in the width direction thereof.

[0088] Specifically in this embodiment, the pole piece gluing device 200 also includes a control module (not shown in the figure), which is respectively connected to the photoelectric sensor 53 and the deflection correction screw 52 to receive the signal of the photoelectric sensor 53 and control the movement of the deflection correction screw 52. Specifically, the photoelectric sensor 53 is arranged on one side of the width direction of the pole piece 231. An initial position is set in the control module in advance, and the actual position of the pole piece 231 is detected in real time by the photoelectric sensor 53, and the actual position is transmitted to the control module through a signal. The control module compares the received actual position with the set initial position, and can obtain the position offset of the pole piece 231, and then issues instructions according to the position offset and controls the movement of the deflection correction screw 52, ​​thereby, the deflection correction screw 52 drives the two first unwinding wheels 421 and the two second unwinding wheels 431 to move synchronously, thereby controlling the gluing position.

[0089] Based on the same concept as the above-mentioned pole piece gluing device 200, the present application also provides a pole piece gluing process, which uses the pole piece gluing device 200 as described above to perform gluing. The pole piece gluing process includes the following steps:

[0090] S10 : Calibration: the position of the pole piece 231 is detected by the deviation correction mechanism 50 , and the gluing mechanism 40 and the pole piece 231 are driven to generate relative displacement to align with the gluing area 41 on the pole piece 231 .

[0091] Specifically in this embodiment, the photoelectric sensor 53 is used to detect the position of the pole piece 231 in the width direction thereof, and to determine the position offset of the pole piece 231 in the width direction thereof.

[0092] The deviation-correcting screw rod 52 drives the gluing mechanism 40 to move along the width direction of the pole piece 231 according to the position offset, so that the gluing mechanism 40 is aligned with the gluing area 41 .

[0093] More specifically, first, an initial position of the pole piece 231 is preset in the control mode, and the actual position of the pole piece 231 is detected in real time by the photoelectric sensor 53. After the photoelectric sensor 53 detects the actual position of the pole piece 231, the actual position is transmitted to the control module through a signal, and the control module compares the received actual position with the set initial position, thereby obtaining the position offset of the pole piece 231, and then issues a command according to the position offset and controls the correction screw 52 to move.

[0094] Since the deflection-correcting screw 52 is fixedly connected to the first unwinding wheel 421 and the second unwinding wheel 431 through the fixing bracket 51, the movement of the deflection-correcting screw 52 can drive the two first unwinding wheels 421 and the two second unwinding wheels 431 to move synchronously. Therefore, the two first unwinding wheels 421 and the two second unwinding wheels 431 can be controlled to always align with the glue-applying area 41, so as to achieve accurate glue-applying.

[0095] S20: Gluing: Gluing the glue area 41 by the glue sticking mechanism 40 .

[0096] Specifically, the first unwinding wheel 421 unwinds on the front side of the pole piece 231, and the first glue pressing roller 422 performs glue pressing along the transmission direction of the pole piece 231. The second unwinding wheel 431 unwinds on the back side of the pole piece 231, and the second glue pressing roller 432 performs glue pressing along the transmission direction of the pole piece 231.

[0097] The two first unwinding wheels 421 rotate coaxially to unwind the tape on the front side of the pole piece 231. At the same time, the two second unwinding wheels 431 rotate coaxially and unwind the tape on the back side of the pole piece 231 at the same speed as the two first unwinding wheels 421. In addition, the first glue pressing roller 422 and the second glue pressing roller 432 are respectively located on the front side and the back side of the pole piece 231, and the positions of the first glue pressing roller 422 and the second glue pressing roller 432 are arranged opposite to each other. Therefore, when the first glue pressing roller 422 and the second glue pressing roller 432 perform glue pressing at the same speed, they can form a support line with each other to facilitate glue pressing.

[0098] Through the above structure, it is possible to glue the front and back sides of the pole piece 231 at the same time, thereby greatly improving the glue sticking efficiency of the pole piece 231 .

[0099] S30: wrapping with adhesive, folding the adhesive tape in the adhesive area 41 that exceeds the width of the pole piece 231 to wrap the edge of the pole piece 231 in the adhesive tape.

[0100] Since the adhesive area 41 exceeds the electrode piece 231 by a certain distance in the width direction of the electrode piece 231, after the adhesive tape is attached to the electrode piece 231, a part of it will form a suspended structure. The suspended structure is folded to fit on the cut end surface of the electrode piece 231, thereby the cut end surface of the electrode piece 231 can also be covered in the adhesive tape. When the battery is formed by combining the electrode pieces 231 and the battery is coated, the burrs on the cut end surface of the electrode piece 231 can be prevented from piercing the diaphragm, thereby causing a short circuit in the battery and affecting the performance of the battery.

[0101] Based on the same concept as the above-mentioned pole piece gluing process, the present application also provides a battery cell, including a pole piece 231 manufactured by the above-mentioned pole piece gluing process.

[0102] Based on the same concept as the above battery cell, the present application also provides a battery, comprising a housing and the above battery cell, wherein the battery cell is arranged in the housing.

[0103] Based on the same concept as the above-mentioned battery, the present application also provides an electrical device, including an electrical main body and the above-mentioned battery.

[0104] When the present application is used specifically, firstly, an initial position of the pole piece 231 is preset in the control module, and during the transmission and gluing process of the pole piece 231, the actual position of the pole piece 231 is detected in real time by the photoelectric sensor 53. The photoelectric sensor 53 transmits the detected actual position of the pole piece 231 to the control module through a signal at a fixed interval. After receiving the signal from the photoelectric sensor 53, the control module compares the actual position with the preset initial position, thereby obtaining the position offset of the pole piece 231. Furthermore, the control module issues instructions according to the position offset and controls the movement of the correction screw 52.

[0105] When the deflection correction screw 52 moves, it can drive the first unwinding wheel 421 and the second unwinding wheel 431 fixedly connected thereto to rotate. The first unwinding wheel 421 and the second unwinding wheel 431 realize the unwinding of the tape during the rotation process. As the pole piece 231 is transmitted, the tape is pressed to the glue-applying area 41 on the front and back sides of the pole piece 231 respectively through the first glue-applying roller 422 and the second glue-applying roller 432. In this way, the glue-applying of the pole piece 231 is realized.

[0106] Furthermore, a portion of the tape suspended outside the electrode piece 231 is folded so that it fits on the cut end surface of the side of the electrode piece 231, so that the tape can physically isolate the burrs on the cut end surface of the electrode piece 231. As a result, during the subsequent battery coating process, the electrode piece 231 will not pierce the diaphragm and cause a battery short circuit because the burrs have been isolated by the tape, thereby improving the battery performance.

[0107] The pole piece gluing device 200, pole piece gluing process, battery cell, battery and electrical device in the above embodiment have at least the following advantages:

[0108] 1) The glue area 41 intersects with the thinned area of ​​the coating edge, and a part of it exceeds the width of the electrode 231. Therefore, it can not only prevent the surface of the electrode coating area 2311 from being exposed, but also cover the cut end surface of the side of the electrode 231, so as to prevent the burrs on the electrode 231 from piercing the diaphragm of the battery and causing a short circuit of the battery, making the structure of the electrode 231 safer and more reliable;

[0109] 2) Through the cooperation of the first gluing component 42 and the second gluing component 43, the front and back sides of the pole piece 231 can be glued at the same time, thereby greatly improving the gluing efficiency of the pole piece 231;

[0110] 3) The photoelectric sensor 53 can detect the position of the pole piece 231 in real time, and drive the first unwinding wheel 421 and the second unwinding wheel 431 to move along with the position of the pole piece 231 through the deviation correction screw 52, ​​thereby ensuring that the first unwinding wheel 421 and the second unwinding wheel 431 are always aligned with the corresponding glue-applying area 41, ensuring the accuracy of glue-applying;

[0111] 4) The present application adopts fixed materials such as PE film or PP film for gluing. Compared with the fluid materials such as AT11 ceramic slurry in the prior art, it does not require a supporting carrier, so that the outer side of the pole piece 231 can be glued, thereby achieving the coating of the cut end face of the pole piece 231, thereby improving the safety performance of the pole piece 231.

[0112] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0113] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A pole piece gluing device, characterized in that: It comprises a gluing mechanism (40), wherein the gluing mechanism (40) is used to glue the pole piece (231) along the transmission direction of the pole piece (231) and form a gluing area (41) on the pole piece (231); The pole piece (231) has a coating area (2311) in the middle, and the adhesive area (41) is located on both sides of the coating area (2311) along the width direction of the pole piece (231) and at least partially overlaps with the coating area (2311); Wherein, the glue-sticking area (41) extends out of the pole piece (231) along the width direction of the pole piece (231).

2. The pole piece gluing device according to claim 1, characterized in that: The gluing mechanism (40) comprises a first gluing component (42) and a second gluing component (43) respectively located on both sides of the pole piece (231) in a direction perpendicular to the pole piece (231); the first gluing component (42) is used to glue the front side of the pole piece (231), and the second gluing component (43) is used to glue the back side of the pole piece (231).

3. The pole piece gluing device according to claim 2, characterized in that: The first glue laminating component (42) comprises a first unwinding wheel (421) and a first glue pressing roller (422), and the second glue laminating component (43) comprises a second unwinding wheel (431) and a second glue pressing roller (432), the first unwinding wheel (421) and the second unwinding wheel (431) are respectively arranged at intervals from the pole piece (231) in a direction perpendicular to the pole piece (231), and the first glue pressing roller (422) and the second glue pressing roller (432) are arranged on both sides of the pole piece (231) in a direction perpendicular to the pole piece (231) so as to press the tape onto the pole piece (231).

4. The pole piece gluing device according to claim 3, characterized in that: The first unwinding wheel (421) and the second unwinding wheel (431) each include two wheels spaced apart along the width direction of the pole piece (231), and correspondingly arranged at the two side edges of the pole piece (231) along the width direction thereof, and the two first unwinding wheels (421) and the two second unwinding wheels (431) respectively correspond to the four glue laminating areas (41).

5. The pole piece gluing device according to claim 4, characterized in that: The width of the glue-applying area (41) is 2 mm.

6. The pole piece gluing device according to claim 1, characterized in that: The pole piece gluing device comprises a deviation correction mechanism (50), and the deviation correction mechanism (50) is transmission-connected to the gluing mechanism (40) to drive the gluing mechanism (40) and the pole piece (231) to generate relative displacement.

7. The pole piece gluing device according to claim 6, characterized in that: The deflection correction mechanism (50) comprises a fixed bracket (51) and a deflection correction screw (52) arranged on the fixed bracket (51); the deflection correction screw (52) is transmission-connected to the gluing mechanism (40); the deflection correction screw (52) can be controlled to drive the gluing mechanism (40) to move in the width direction of the pole piece (231).

8. The pole piece gluing device according to claim 6, characterized in that: The deviation correction mechanism (50) comprises a photoelectric sensor (53), wherein the photoelectric sensor (53) is arranged at the edge of the pole piece (231) to detect the position of the pole piece (231) in the width direction thereof.

9. A pole piece gluing process, characterized in that: The method of gluing a pole piece using the pole piece gluing device according to any one of claims 1 to 8 comprises the following steps: Calibration: detecting the position of the pole piece (231) through a deviation correction mechanism (50), and driving the gluing mechanism (40) and the pole piece (231) to generate relative displacement so as to align with the gluing area (41) on the pole piece (231); Gluing: gluing the glue-applying area (41) by means of the gluing mechanism (40).

10. The pole piece gluing process according to claim 9, characterized in that: The calibration steps include: Using a photoelectric sensor (53) to detect the position of the pole piece (231) in the width direction thereof, and determining the position offset of the pole piece (231) in the width direction thereof; The deflection-correcting screw rod (52) drives the gluing mechanism (40) to move along the width direction of the pole piece (231) according to the position offset, so that the gluing mechanism (40) is aligned with the gluing area (41).

11. The pole piece gluing process according to claim 9, characterized in that: The gluing steps specifically include: The first unwinding wheel (421) unwinds the electrode on the front side of the electrode (231), and the first glue pressing roller (422) performs glue pressing along the transmission direction of the electrode (231); The second unwinding wheel (431) unwinds on the back side of the pole piece (231), and the second glue pressing roller (432) performs glue pressing along the transmission direction of the pole piece (231).

12. The pole piece gluing process according to claim 9, characterized in that: After the gluing step, the following steps are also included: Encapsulating with adhesive, folding the adhesive tape in the adhesive area (41) that exceeds the width of the pole piece (231) so as to encapsulate the edge of the pole piece (231) within the adhesive tape.

13. A battery cell, characterized in that: It comprises a pole piece (231) manufactured by the pole piece gluing process according to any one of claims 9 to 12.

14. A battery, characterized in that: It comprises a shell and the battery cell as claimed in claim 13, wherein the battery cell is arranged in the shell.

15. An electrical device, characterized in that: It comprises an electric main body and a battery as claimed in claim 14.

Images