Correction process, pole piece correction device, battery cell, battery, power device

Abstract

The present application relates to a correction process, a pole piece correction device, a battery cell, a battery and an electrical device, wherein the correction process includes the following steps: during the unwinding and transporting stage; during the first detection stage, at least two first detection points on the pole piece are respectively detected for distance to obtain any two first distance detection values; during the correction stage, any two first distance detection values ​​are compared to obtain a first deviation value, and the pole piece is subjected to corresponding correction compensation according to the first deviation value to eliminate the first deviation value. The present application determines whether the pole piece has a wavy edge according to the first deviation value, and obtains the change distance of the wavy edge of the pole piece; thereby, the pole piece is corrected with a change equal to the change size of the wavy edge and in the opposite direction of the change, and the wavy edge of the pole piece is compensated accordingly, thereby ensuring that the pole piece remains stable during the subsequent winding or lamination process and improving the battery quality.

Description

Technical Field

[0001] The present invention relates to the technical field of battery production equipment, and in particular to a deviation correction process, a pole piece deviation correction device, a battery cell, a battery and an electrical device. Background Art

[0002] The battery is made of pole pieces that are wound or stacked, and the pole pieces need to be sliced ​​to obtain the corresponding size that meets the requirements. During the slicing process of the pole pieces, the pole pieces may have wavy edges due to the mechanical errors of the slicing equipment or other factors in the slicing process. The wavy edge phenomenon will affect the subsequent winding or stacking of the pole pieces, thereby affecting the quality of the battery formed by the winding or stacking of the pole pieces. In addition, when winding or stacking the pole pieces using winding equipment or stacking equipment, since the winding equipment and stacking equipment also have certain mechanical errors, the probability of the pole piece wavy edge phenomenon will be further increased.

[0003] Based on the above situation, it is necessary to provide a correction process and a pole piece correction device that can improve the wavy edge of the pole piece. Summary of the invention

[0004] Based on this, it is necessary to provide a correction process, a pole piece correction device, a battery cell, a battery and an electrical device to improve the wavy edge phenomenon of the pole piece, which affects the subsequent winding and stacking.

[0005] In a first aspect, the present application provides a correction process, comprising the steps of:

[0006] In the unwinding and transporting stage, the pole piece is unwound and transported along a preset direction; in the first detection stage, distance detection is performed on at least two first detection points on the pole piece that are spaced apart along the preset direction, so as to obtain a first distance detection value of each first detection point relative to a first reference position along the first direction; wherein the pole piece has a first side surface located on one side along the first direction, the first detection point is located on the first side surface, and the first reference position and the first side surface are spaced apart along the first direction;

[0007] In the deviation correction stage, any two of the first distance detection values ​​are compared to obtain a first deviation value, and corresponding deviation correction compensation is performed on the pole piece according to the first deviation value to eliminate the first deviation value.

[0008] By comparing any two first distance detection values, the change amount of the pole piece in the first direction can be obtained, thereby determining whether the pole piece has a wavy edge and the curvature of the wavy edge of the pole piece.

[0009] In some embodiments, in the first detection phase step, the distance detection is performed multiple times on the at least two first detection points according to a first predetermined time to obtain a first time deviation curve formed by multiple first deviation values, and in the correction phase step, a corresponding first time correction curve is formed according to the first time deviation curve to perform real-time correction on the pole piece.

[0010] Through the shape and trend of the first time deviation curve, the change in the curvature of the wave edge of the pole piece can be quickly and intuitively judged, thereby judging the production quality of the pole piece. Furthermore, through the comparison between the first time deviation curve and the first time correction curve, the correction effect on the pole piece can also be more intuitively reflected.

[0011] In some embodiments, the correction process further comprises the steps of:

[0012] In a second detection stage, a second detection point is set between two of the first detection points, and a distance detection is performed on the second detection point to obtain a second distance detection value of the second detection point relative to a second reference position along a second direction; wherein the pole piece has a second side surface located on one side along the second direction, the second detection point is located on the second side surface, the second reference position and the second side surface are spaced apart along the second direction, and the second direction is perpendicular to the first direction;

[0013] The deviation correction stage also includes:

[0014] A second deviation value is obtained through the second distance detection value, and corresponding correction compensation is performed on the pole piece according to the sum of the second deviation value and the first deviation value to eliminate the first deviation value and the second deviation value.

[0015] By performing distance detection on the second detection point, a second distance detection value of the pole piece in the second direction can be obtained, and the deformation amount of the pole piece along the second direction is converted into a compensation amount in the first direction, thereby making the deviation correction of the pole piece more accurate.

[0016] In some embodiments, in the correction phase, the second distance detection value includes a projection length a of the second detection point in the first direction and a distance b between the second detection point and the pole piece in the second direction, and the second deviation value Δd2 is obtained according to the following formula:

[0017]

[0018] The second deviation value of the pole piece in the first direction can be calculated through the second distance detection value, the second deviation value is compensated to the first deviation value, and then the sum of the first deviation value and the second deviation value is uniformly corrected, thereby making it possible to correct the pole piece more accurately.

[0019] In some embodiments, in the second detection phase step, the distance detection is performed multiple times on the second detection point according to a second predetermined time to obtain a second time deviation curve formed by multiple second deviation values, and in the correction phase step, a corresponding second time correction curve is formed according to the second time deviation curve to perform real-time correction on the pole piece.

[0020] By using the shape and trend of the second time deviation curve, the change in the curvature of the wave edge of the pole piece can be quickly and intuitively judged, thereby judging the production quality of the pole piece. Furthermore, by comparing the second time deviation curve with the second time correction curve, the correction effect of the pole piece can also be more intuitively reflected.

[0021] In a second aspect, the present application provides a pole piece deviation correction device, comprising:

[0022] An unwinding device, used for unwinding the pole piece;

[0023] A transport device, used for transporting the unwound pole piece along a preset direction;

[0024] a deviation-correcting device, arranged at a distance from the unwinding device along the preset direction and located downstream of the unwinding device; and

[0025] A sensing device is arranged between the unwinding device and the correcting device, and is used to perform distance detection on at least two first detection points on the pole piece that are spaced apart along the preset direction, so as to obtain a first distance detection value of each first detection point relative to a first reference position along the first direction; wherein the pole piece has a first side surface located on one side along the first direction, the first detection point is located on the first side surface, the first reference position and the first side surface are spaced apart along the first direction, and the correcting device is used to compare any two of the first distance detection values ​​to obtain a first deviation value, and perform corresponding correction compensation on the pole piece according to the first deviation value to eliminate the first deviation value.

[0026] In some embodiments, the correcting device includes a first correcting roller and a second correcting roller arranged at intervals along the preset direction, and the pole piece is wound around the first correcting roller and the second correcting roller in sequence. The first correcting roller and the second correcting roller can swing synchronously to correct the pole piece along the first direction.

[0027] In some embodiments, the sensing device includes a first sensor and a second sensor arranged at intervals along the preset direction, the first sensor is used to detect one of the first detection points to obtain a first distance detection value, and the second sensor is used to detect another of the first detection points to obtain another first distance detection value.

[0028] In some embodiments, the pole piece correction device includes a third sensor disposed between the first sensor and the second sensor, and the third sensor is used to detect the second detection point to obtain the second distance detection value.

[0029] In a third aspect, the present application provides a battery cell, including a pole piece manufactured using the deviation correction process as described above.

[0030] In a fourth aspect, the present application provides a battery, comprising a shell and a battery cell disposed in the shell, wherein the battery cell is the battery cell described above.

[0031] In a fifth aspect, the present application provides an electrical device, including an electrical main body and the battery as described above.

[0032] The above-mentioned correction process, pole piece correction device, battery cell, battery and electrical device obtain a first deviation value by comparing the difference between any two first distance detection values, and judge whether the pole piece has a wavy edge according to the first deviation value, and obtain the change distance of the wavy edge of the pole piece; thereby, the pole piece is corrected with a change equal to the change in magnitude and opposite to the change in direction of the wavy edge, and the wavy edge of the pole piece is compensated accordingly, thereby ensuring that the pole piece remains stable during the subsequent winding or stacking process, thereby improving the battery quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of a vehicle in one embodiment of the present application;

[0034] Figure 2 This is a schematic diagram of the exploded structure of a battery in one embodiment of the present application;

[0035] Figure 3 This is a schematic diagram of the exploded structure of a battery cell in one embodiment of the present application;

[0036] Figure 4 This is a schematic diagram of the structure of a pole piece deviation correction device in one embodiment of the present application;

[0037] Figure 5 for Figure 4 A schematic diagram of the partial structure of the pole piece correction device shown;

[0038] Figure 6 for Figure 4A schematic diagram of the partial structure of the pole piece correction device shown;

[0039] Figure 7 for Figure 4 A schematic diagram of the partial structure of the pole piece correction device shown;

[0040] In the figure: 100-vehicle, 400-pole piece correction device, 10-battery, 20-controller, 30-motor, 40-unwinding device, 50-correction device, 60-sensing device, 11-casing, 12-battery cell, 51-first correction roller, 52-second correction roller, 61-first inductor, 62-second inductor, 63-third inductor, 64-fourth inductor, 111-first part, 112-second part, 121-end cover, 122-shell, 123-battery cell assembly, 201-pole piece, 1211-electrode terminal, 1231-ear. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention 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 invention. However, the present invention 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 invention, so the present invention is not limited by the specific embodiments disclosed below.

[0042] In the description of the present invention, 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 invention 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 limiting the present invention.

[0043] 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 the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In the present invention, 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 the present invention can be understood according to specific circumstances.

[0045] In the present invention, 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" or "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" or "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.

[0046] 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.

[0047] 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.

[0048] 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 winding or 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 hole punched in it, 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.

[0049] In the above-mentioned electrode sheet punching process, in theory, the punched electrode sheet should have a smooth and straight edge. However, in reality, due to the mechanical error of the punching tool or the influence of other factors in the punching process, the punched edge of the electrode sheet is not straight, but has an undulating wavy edge. The electrode sheet with a wavy edge will affect the quality of the assembled battery during the subsequent winding or lamination.

[0050] In the prior art, a serpentine correction device is usually used to correct the position of the pole piece before the pole piece is wound or stacked. However, the inventors of the present invention noticed that since the serpentine correction device corrects the position of the pole piece before it enters the winding or stacking process, its correction median is a fixed value, and its working principle is to keep the pole piece in the same entry position when entering the winding or stacking process. However, the wavy edge of the pole piece has a randomly changing curvature and cannot be corrected by a fixed value. Based on this, the use of the existing serpentine correction device cannot improve the wavy edge phenomenon of the pole piece.

[0051] After in-depth research and exploration, the inventors discovered that the existing serpentine correction device can be used to change its fixed correction median value into a variable correction median value that matches the arc shape of the wavy edge of the pole piece, so that the serpentine correction device can output correction medians of different sizes for the wavy edges of different arcs at different positions of the pole piece during the transportation of the pole piece, so that the pole piece can produce correction displacements of different sizes, which compensate and offset each other with the wavy edges of its own corresponding arc.

[0052] Based on the above considerations, in order to solve the problem of wavy edges on the pole piece and thus affecting the quality of the battery, the inventors have designed a correction process and a pole piece correction device after in-depth research. By sensing the position of a detection point on the pole piece, the offset distance of the detection point along the width direction of the pole piece when it is located at different positions during transportation is obtained. Then, according to the size of the offset distance, the corresponding correction compensation is performed through the serpentine correction device, so that the pole piece produces a corresponding correction displacement along its width direction, thereby offsetting its own wavy edge.

[0053] The battery cells disclosed in the embodiments of the present application can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft. The embodiments of the present application provide an electrical device that uses a battery as a power source, and the electrical device can be, but not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and the spacecraft can include airplanes, rockets, space shuttles, and spacecrafts, and the like.

[0054] For the convenience of description, the following embodiments are described by taking a vehicle 100 as an example of an electrical device according to an embodiment of the present application.

[0055] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 100 provided in some embodiments of the present application. A battery 10 is provided inside the vehicle 100, and the battery 10 can 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.

[0056] 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 .

[0057] Please refer to Figure 2 , Figure 2An 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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 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 1211 can be provided on the end cap 121. The electrode terminal 1211 can be used to electrically connect to the battery cell assembly 123 for outputting or inputting 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 122 from the end cap 121 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0062] 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.

[0063] 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 substances constitute the main body of the battery cell assembly, and the parts of the positive and negative electrode sheets without active substances each constitute a tab 1231. 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 substance and the negative active substance react with the electrolyte, and the tab 1231 connects the electrode terminal 1211 to form a current loop.

[0064] See also Figure 4 , Figure 4 The figure is a schematic diagram of the structure of the pole piece correction device in one embodiment of the present application. For the convenience of description, the figure only shows the structure related to the embodiment of the present invention. One embodiment of the present invention provides a correction process, including the steps of:

[0065] S10: unwinding and transporting stage, unwinding the electrode 201 and transporting it along a preset direction

[0066] S20: In the first detection stage, two first detection points spaced apart along a preset direction on the pole piece 201 are respectively distance-detected to obtain a first distance detection value of each first detection point relative to a first reference position along the first direction. The pole piece 201 has a first side surface located on one side along the first direction, the first detection point is located on the first side surface, and the first reference position and the first side surface are spaced apart along the first direction.

[0067] like Figure 5 As shown, Figure 5 It is a partial structural diagram of the pole piece correction device in one embodiment of the present application. Specifically in this embodiment, the first direction is specifically the width direction of the pole piece 201. The first sensor 61 and the second sensor 62 are sequentially arranged at the edge of the pole piece 201 along the preset direction to detect the first distance detection value X1 of the two first detection points on the pole piece 201 at the first sensor 61 and the first distance detection value X2 at the second sensor 62 respectively. By comparing the changes of the two first distance detection values ​​X1 and X2 in the width direction of the pole piece 201, it can be determined whether the pole piece 201 has a wavy edge and the curvature of the wavy edge of the pole piece.

[0068] Specifically, if one of the first distance detection values ​​is X1 and the other first distance detection value is X2, theoretically, if the pole piece 201 does not have a wavy edge phenomenon, then X1=X2, that is, the difference between the two is zero. If X1≠X2, it means that the pole piece 201 has a wavy edge, and the greater the difference between X1 and X2, the greater the curvature of the wavy edge of the pole piece 201. In this way, it is possible to simply and quickly determine whether the pole piece 201 has a wavy edge, and the magnitude of the curvature of the wavy edge of the pole piece 201 can be obtained.

[0069] S30: In the second detection stage, a second detection point is set between two first detection points, and a distance detection is performed on the second detection point to obtain a second distance detection value X3 of the second detection point relative to the second reference position along the second direction. The pole piece 201 has a second side surface located on one side along the second direction, the second detection point is located on the second side surface, the second reference position and the second side surface are spaced apart along the second direction, and the second direction is perpendicular to the first direction.

[0070] Please see Figure 6 and Figure 7 , Figure 6 and Figure 7 They are partial structural schematic diagrams of a pole piece correction device in an embodiment of the present application. Specifically in this embodiment, the second direction is specifically a direction perpendicular to the pole piece 201. Since the pole piece 201 not only has a wavy edge in the width direction, the edge of the pole piece 201 will also be tilted in a direction perpendicular to the pole piece 201. When the pole piece 201 is tilted, the position of the detection point in the width direction of the pole piece 201 will change, thereby causing an error in the correction amount of the correction device.

[0071] Therefore, in order to more accurately correct the deviation of the pole piece 201, a third sensor 63 can be added between the first sensor 61 and the second sensor 62. The third sensor 63 senses the tilted height of the pole piece 201 and converts it into a displacement in the width direction of the pole piece 201. The displacement is combined with the first deviation value Δd1 to make the correction amount more accurate.

[0072] S40: In the deviation correction stage, any two first distance detection values ​​X1 and X2 are compared to obtain a first deviation value Δd1, and corresponding deviation correction compensation is performed on the pole piece according to the first deviation value Δd1 to eliminate the first deviation value Δd1.

[0073] After obtaining any two first distance detection values ​​X1 and X2, the first deviation value Δd1 can be obtained according to the two values. At this time, the pole piece 201 can be corrected accordingly according to the first deviation value Δd1.

[0074] Specifically, the correction device 50 is disposed behind the first sensor 61 along a preset direction. The correction device 50 can generate a correction amount that is equal to the first deviation value Δd1 and opposite in direction to perform correction compensation on the pole piece 201 .

[0075] S41: Obtain a second deviation value Δd2 through the second distance detection value X3, and perform corresponding correction compensation on the pole piece 201 according to the sum of the second deviation value Δd2 and the first deviation value Δd1 to eliminate the first deviation value Δd1 and the second deviation value Δd2.

[0076] In some embodiments, in the first detection phase step, multiple distance detections are performed on at least two first detection points according to a first predetermined time to obtain a first time deviation curve formed by multiple first deviation values ​​Δd1. In the correction phase step, a corresponding first time correction curve is formed according to the first time deviation curve to correct the pole piece 201 in real time.

[0077] In this specific embodiment, the first deviation value Δd1 is monitored in real time, and points are taken at regular intervals to simulate a first time deviation curve on the coordinate axis, which can intuitively reflect the change in the wave edge of the pole piece 201. The correction median of the correction device 50 is set to change in real time, and the magnitude of the correction median is equal to the first deviation value Δd1, and its direction is opposite to the first deviation value Δd1, even if the correction median is equal to -Δd1. In this way, the wave edge compensation of the pole piece 201 can be offset by the correction device 50.

[0078] Further, the second distance detection value X3 includes the projection length a of the raised portion of the pole piece 201 in the width direction of the pole piece 201 and the raised height b of the pole piece 201, and the second deviation value Δd2 is obtained according to the following formula:

[0079]

[0080] Specifically, the third sensor 63 is configured as a height sensor and is configured perpendicular to the pole piece 201. When the edge of the pole piece 201 is tilted, there is a certain deviation between the second distance detection value X3 of the second detection point on the pole piece 201 and the actual distance, and the deviation is the second deviation value Δd2. By setting the third sensor 63, the second distance detection value X3 of the second detection point is obtained, and the second deviation value Δd2 is calculated by the above formula, so as to compensate for the deviation in the height direction when the edge of the pole piece 201 is tilted. Combined with the first deviation value Δd1 and the second deviation value Δd2, the height deviation of the pole piece 201 can be further compensated, so as to more accurately correct the wavy edge of the pole piece 201.

[0081] In some embodiments, in the second detection phase step, multiple distance detections are performed on the second detection point according to the second predetermined time to obtain a second time deviation curve formed by multiple second deviation values ​​Δd2. In the correction phase step, a corresponding second time correction curve is formed according to the second time deviation curve to correct the pole piece 201 in real time.

[0082] Specifically in this embodiment, the second time deviation curve can be obtained by compensating the second deviation value Δd2 into the first time deviation curve, that is, on the basis of the first deviation value Δd1, the height compensation amount of the pole piece 201 is increased, and the correction median value of the correction device 50 is set to a fourth curve that is equal to the sum of the first deviation value Δd1 and the second deviation value Δd2 and has an opposite direction, thereby compensating and offsetting the wavy edge of the pole piece 201.

[0083] Based on the same concept as the above-mentioned correction process, the present application also provides a pole piece correction device 400, including an unwinding device 40, a transportation device, a correction device 50 and a sensing device 60. The unwinding device 40 is used to unwind the pole piece 201, and the transportation device is used to transport the unwound pole piece 201 along a preset direction. The correction device 50 is arranged at intervals from the unwinding device 40 along the preset direction and is located downstream of the unwinding device 40.

[0084] The sensing device 60 is disposed between the unwinding device 40 and the correcting device 50, and is used to perform distance detection on at least two first detection points spaced apart along a preset direction on the pole piece 201, so as to obtain a first distance detection value of each first detection point relative to a first reference position along a first direction.

[0085] The pole piece 201 has a first side surface located at one side along a first direction, the first detection point is located on the first side surface, and the first reference position is spaced apart from the first side surface along the first direction. The deviation correction device 50 is used to compare any two first distance detection values ​​X1 and X2 to obtain a first deviation value Δd1, and perform corresponding deviation correction compensation on the pole piece 201 according to the first deviation value Δd1 to eliminate the first deviation value Δd1.

[0086] In addition, the correction device 50 performs correction compensation on the pole piece 201 along the width direction of the pole piece 201 according to the difference between any two first distance detection values ​​X1 and X2 detected by the sensing device 60 .

[0087] Furthermore, the sensing device 60 includes a first sensor 61 and a second sensor 62 arranged at intervals along a preset direction. The first sensor 61 is used to detect one of the first detection points to obtain a first distance detection value X1. The second sensor 62 is used to detect another first detection point to obtain another first distance detection value X2.

[0088] Specifically, the first sensor 61 detects one of the first detection points and obtains a first distance detection value X1. Meanwhile, the second sensor 62 detects another first detection point and obtains a second distance detection value X2.

[0089] Furthermore, the change of the wavy edge of the pole piece 201 can be obtained according to the values ​​of any two first distance detection values ​​X1 and X2. When X1 and X2 are equal, the edge of the pole piece 201 is straight and smooth, and there is no wavy edge phenomenon. When X1 and X2 are not equal, there is a wavy edge phenomenon in the pole piece 201, and the greater the difference between X1 and X2, the greater the change in the curvature of the wavy edge of the pole piece 201.

[0090] After obtaining the curvature of the wave edge of the pole piece 201 through the first sensor 61 and the second sensor 62, a correction compensation value that is equal to and opposite to the difference between any two first distance detection values ​​X1 and X2 is output through the correction device 50. The correction compensation value is adjusted along the direction opposite to the curvature of the wave edge of the pole piece 201 through the correction device 50, so that the wave edge of the pole piece 201 is compensated and offset.

[0091] In some embodiments, the deflection correction device 50 includes a first deflection correction roller 51 and a second deflection correction roller 52 arranged at intervals along a preset direction, and the pole piece 201 is sequentially wound around the first deflection correction roller 51 and the second deflection correction roller 52. In addition, the first deflection correction roller 51 and the second deflection correction roller 52 can swing synchronously to correct the deflection of the pole piece 201 along the first direction.

[0092] Specifically in this embodiment, the first deflection correction roller 51 and the second deflection correction roller 52 are arranged parallel to the pole piece 201 and spaced apart from each other, and the pole piece 201 is arranged parallel to the axial direction of the first deflection correction roller 51 and the second deflection correction roller 52 and passes through the two, and is wound around the first deflection correction roller 51 and the second deflection correction roller 52 in sequence.

[0093] The first deflection correction roller 51 and the second deflection correction roller 52 can swing around their axes respectively, and the swing arcs of the two are the same, so that they can keep swinging synchronously. During the swinging of the first deflection correction roller 51 and the second deflection correction roller 52 around their axes respectively, the pole piece 201 located therebetween can be adjusted along the width direction of the pole piece 201. In addition, by changing the deflection correction median of the deflection correction device 50, that is, changing the arc size of the swinging of the first deflection correction roller 51 and the second deflection correction roller 52 around their axes, the displacement size of the pole piece 201 in its width direction can be adjusted.

[0094] Furthermore, the pole piece deviation correction device 400 includes a third sensor 63 disposed between the first sensor 61 and the second sensor 62. The third sensor 63 is used to detect the second detection point to obtain a second distance detection value X3.

[0095] Specifically, the third sensor 63 is a height sensor, that is, it detects the height of the pole piece 201. When the edge of the pole piece 201 is tilted, there is a certain deviation between the sensing distance of the second detection point in the width direction of the pole piece 201 and its actual distance. If the deviation value is ignored, the deviation correction of the pole piece 201 will not be in place.

[0096] Therefore, by setting a height sensor, the second detection point on the pole piece 201 is detected in a direction perpendicular to the pole piece 201, and the second distance detection value X3 of the second detection point is obtained. Specifically, the second distance detection value X3 includes the projection length a of the tilted portion of the pole piece 201 in the width direction of the pole piece 201 and the tilted height b of the pole piece 201. According to the projection length a in the width direction of the pole piece 201 and the tilted height b of the pole piece 201, the second deviation value Δd2 of the pole piece can be calculated, and the specific calculation formula is as follows:

[0097]

[0098] Furthermore, the first deviation value Δd1 is combined with the second deviation value Δd2 to obtain a final deviation value of the pole piece 201 , and then the final deviation value is corrected and compensated by the correction device 50 .

[0099] It should be noted that the pole piece correction device 400 provided in the present application also includes a fourth sensor 64 arranged behind the serpentine correction device 70 along the transportation direction of the pole piece 201. After the pole piece 201 passes through the correction device 50 for correction compensation, the pole piece 201 is detected again by the fourth sensor 64 to obtain a third distance detection value X4. Further, the third distance detection value X4 is fed back to the controller (not shown in the figure), and compared with the correction target value preset in the controller, so as to obtain the correction effect of the pole piece 201. Furthermore, the difference after comparing the third distance detection value X4 with the preset correction target value is fed back to the correction device, so as to control the correction device 50 to adjust the correction process, so as to be able to correct the pole piece 201 more accurately.

[0100] Based on the same concept as the above-mentioned deviation correction process, the present application also provides a battery cell, including a pole piece manufactured by the above-mentioned deviation correction process.

[0101] Based on the same concept as the above-mentioned battery cell, the present application also provides a battery, including a shell and a battery cell arranged in the shell, and the battery cell is the battery cell described above.

[0102] 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.

[0103] When the present application is used, at least two first detection points are set on the pole piece 201, and any two first detection points are detected by the first sensor 61 and the second sensor 62, and the first distance detection values ​​X1 and X2 at any two first detection points are obtained. By comparing any two first distance detection values ​​X1 and X2, the first deviation value Δd1 is obtained.

[0104] In addition, the second detection point is detected by the third sensor 63 to obtain a second distance detection value X3. At this time, since the pole piece 201 at the second detection point is tilted, there is a certain deviation between the second distance detection value X3 and the actual distance of the second detection point. The deviation is calculated by combining the projection length a of the tilted portion of the pole piece 201 in the width direction of the pole piece 201 and the tilted height b of the pole piece 201 with a formula, that is, the second deviation value Δd2.

[0105] The first deviation value Δd1 and the second deviation value Δd2 are combined to obtain the final deviation distance of the pole piece 201. By adjusting the deviation correction median of the deviation correction device 50 to match the sum of the first deviation value Δd1 and the second deviation value Δd2, the change of the wave edge of the pole piece 201 can be offset and the deviation correction compensation of the pole piece 201 can be performed.

[0106] The correction process, pole piece correction device 400, battery cell, battery and power-consuming device in the above embodiment have at least the following advantages:

[0107] 1) The first distance detection values ​​X1 and X2 of any two first detection points are measured respectively by the first sensor 61 and the second sensor 62. According to the first deviation value Δd1 between X1 and X2, it is possible to quickly and conveniently determine whether the pole piece 201 has a wavy edge, and quickly know the size of the wavy edge change arc of the pole piece 201, so as to detect the quality of the pole piece 201;

[0108] 2) The correction device 50 can adjust the value of the correction median in real time according to the change in the size of the first deviation value Δd1, so that it matches the change in the size of the wavy edge of the pole piece 201, thereby offsetting the wavy edge of the pole piece 201 in real time, ensuring that the pole piece 201 remains straight when entering winding or lamination, thereby improving the performance of the battery;

[0109] 3) The third sensor 63 can further detect the height of the pole piece 201 tilted in a direction perpendicular to itself, thereby obtaining a second deviation value Δd2, i.e., a height compensation amount of the pole piece 201. Combining the first deviation value Δd1 with the height compensation amount can more accurately correct the deviation of the pole piece 201.

[0110] 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.

[0111] The above-mentioned embodiments only express several implementation methods of the present invention, 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 ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A correction process, characterized in that: Includes steps: In the unwinding and transportation stage, the electrode is unwinded and transported in a preset direction; In the first detection stage, distance detection is performed on at least two first detection points spaced apart along the preset direction on the pole piece, respectively, so as to obtain a first distance detection value of each first detection point relative to a first reference position along the first direction; wherein the pole piece has a first side surface located on one side along the first direction, the first detection point is located on the first side surface, and the first reference position and the first side surface are spaced apart along the first direction; In the deviation correction stage, any two of the first distance detection values ​​are compared to obtain a first deviation value, and corresponding deviation correction compensation is performed on the pole piece according to the first deviation value to eliminate the first deviation value.

2. The correction process according to claim 1, characterized in that: In the first detection phase step, the distance detection is performed multiple times on the at least two first detection points according to the first predetermined time to obtain a first time deviation curve formed by multiple first deviation values. In the correction phase step, a corresponding first time correction curve is formed according to the first time deviation curve to perform real-time correction on the pole piece.

3. The correction process according to claim 1, characterized in that: The correction process also includes the steps of: In a second detection stage, a second detection point is set between two of the first detection points, and a distance detection is performed on the second detection point to obtain a second distance detection value of the second detection point relative to a second reference position along a second direction; wherein the pole piece has a second side surface located on one side along the second direction, the second detection point is located on the second side surface, the second reference position and the second side surface are spaced apart along the second direction, and the second direction is perpendicular to the first direction; The deviation correction stage also includes: A second deviation value is obtained through the second distance detection value, and corresponding correction compensation is performed on the pole piece according to the sum of the second deviation value and the first deviation value to eliminate the first deviation value and the second deviation value.

4. The correction process according to claim 3, characterized in that: In the correction phase, the second distance detection value includes the projection length a of the second detection point in the first direction and the distance b between the second detection point and the pole piece in the second direction. The second deviation value Δd2 is obtained according to the following formula:

5. The correction process according to claim 3, characterized in that: In the second detection phase step, the distance detection is performed multiple times on the second detection point according to the second predetermined time to obtain a second time deviation curve formed by multiple second deviation values. In the correction phase step, a corresponding second time correction curve is formed according to the second time deviation curve to perform real-time correction on the pole piece.

6. A pole piece deviation correction device, characterized in that: include: An unwinding device, used for unwinding the pole piece; A transport device, used for transporting the unwound pole piece along a preset direction; A deviation correction device, arranged at a distance from the unwinding device along the preset direction and located downstream of the unwinding device; as well as A sensing device is arranged between the unwinding device and the correcting device, and is used to perform distance detection on at least two first detection points on the pole piece that are spaced apart along the preset direction, so as to obtain a first distance detection value of each first detection point relative to a first reference position along the first direction; wherein the pole piece has a first side surface located on one side along the first direction, the first detection point is located on the first side surface, the first reference position and the first side surface are spaced apart along the first direction, and the correcting device is used to compare any two of the first distance detection values ​​to obtain a first deviation value, and perform corresponding correction compensation on the pole piece according to the first deviation value to eliminate the first deviation value.

7. The pole piece deviation correction device according to claim 6, characterized in that: The deflection correction device comprises a first deflection correction roller and a second deflection correction roller which are arranged at intervals along the preset direction. The pole piece is wound around the first deflection correction roller and the second deflection correction roller in sequence. The first deflection correction roller and the second deflection correction roller can swing synchronously to correct the pole piece along the first direction.

8. The pole piece deviation correction device according to claim 6, characterized in that: The sensing device includes a first sensor and a second sensor arranged at intervals along the preset direction, the first sensor is used to detect one of the first detection points to obtain a first distance detection value, and the second sensor is used to detect another of the first detection points to obtain another first distance detection value.

9. The pole piece deviation correction device according to claim 8, characterized in that: A second detection point is set between two of the first detection points, and the pole piece correction device includes a third sensor arranged between the first sensor and the second sensor, and the third sensor is used to detect the second detection point to obtain a second distance detection value.

10. A battery cell, characterized in that: It comprises a pole piece manufactured by the deviation correction process as described in any one of claims 1 to 5.

11. A battery, characterized in that: It comprises a shell and a battery cell arranged in the shell, and the battery cell is the battery cell as claimed in claim 10.

12. An electrical device, characterized in that: It comprises an electric main body and a battery as claimed in claim 11.

Images