Laser light path control system, pole piece cutting system and battery production line

Abstract

The embodiment of the invention provides a laser light path control system, a pole piece cutting system and a battery production line, and belongs to the technical field of laser cutting. The laser light path control system comprises a first reflector, the first reflector comprises a first reflecting mirror and a first driver in dynamic coupling connection with the first reflecting mirror, and the first driver comprises a first one-way motor used for driving the first reflecting mirror to rotate along a rotating axis; the first reflecting mirror comprises a plurality of reflecting surfaces which are sequentially connected end to end around the rotating axis, and the reflecting surfaces are symmetrically arranged relative to the rotating axis; the second reflector comprises a second reflecting mirror and a second driver which is in dynamic coupling connection with the second reflecting mirror, and the second driver comprises a second one-way motor which is used for driving the second reflecting mirror to rotate along the rotating axis; the laser generator is used for emitting laser to the first reflecting mirror or the second reflecting mirror, and one of the first reflecting mirror and the second reflecting mirror is used for reflecting the laser to the other one. According to the electrode lug cutting device, errors can be reduced, and the cutting precision and efficiency of the electrode lug are improved.

Description

Technical Field

[0001] The present application relates to the field of laser cutting technology, and more specifically, to a laser light path control system, a pole piece cutting system and a battery production line. Background Art

[0002] In related technologies, laser cutting is mainly used to cut long tabs. Laser cutting uses a galvanometer to control the laser beam, but the inertia of the galvanometer itself will cause errors and lags in the laser light path at the turning point and reciprocating motion, thereby affecting the cutting accuracy and efficiency of the tabs. There is room for improvement. Summary of the Invention

[0003] The present application provides a laser optical path control system, a pole piece cutting system and a battery production line, which can reduce errors and improve the cutting accuracy and efficiency of the pole tabs.

[0004] In a first aspect, an embodiment of the present application provides a laser light path control system, comprising: A first reflector includes a first reflector and a first driver dynamically coupled to the first reflector, the first driver including a first unidirectional motor configured to drive the first reflector to rotate along a rotation axis; the first reflector includes a plurality of reflective surfaces sequentially connected end to end around the rotation axis, the plurality of reflective surfaces being symmetrically arranged relative to the rotation axis; A second reflector includes a second reflector and a second driver that is dynamically coupled to the second reflector, wherein the second driver includes a second unidirectional motor configured to drive the second reflector to rotate along a rotation axis; A laser generator is used to emit laser light toward one of the first reflecting mirror and the second reflecting mirror, wherein the one of the first reflecting mirror and the second reflecting mirror is used to reflect the laser light toward the other of the first reflecting mirror and the second reflecting mirror.

[0005] In the above technical solution, a plurality of reflective surfaces connected end to end around the rotation axis are arranged on the first reflector, and the area of ​​each reflective surface is the same. When the reflective surface rotates to a preset position, it can be used to reflect the laser, and the landing point of the laser on different reflective surfaces changes in the same way. The rotation direction of the first reflector will not change, which helps to reduce errors and improve the cutting accuracy and efficiency of the tabs.

[0006] In some embodiments, the second driver further comprises a planetary gear, and the second reflector is power-coupled to an output end of the second unidirectional motor and one of the planetary gears.

[0007] In some embodiments, the laser generator is used to emit laser light toward the first reflector, and the first reflector is used to reflect laser light toward the second reflector.

[0008] In some embodiments, the first reflector is a polygonal prism structure, and the side surfaces of the polygonal prism structure form the multiple reflective surfaces.

[0009] In some embodiments, the second reflector is a single-sided galvanometer mirror.

[0010] In some embodiments, the first reflector includes multiple groups, and the multiple groups of first reflectors correspond to different cutting paths.

[0011] In a second aspect, an embodiment of the present application provides a pole piece cutting system, comprising a laser optical path control system as described in any one of the above.

[0012] In a third aspect, an embodiment of the present application provides a battery production line, including the pole piece cutting system as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 One of the structural schematic diagrams of the laser light path control system provided in some embodiments of the present application; Figure 2 The second structural diagram of the laser light path control system provided in some embodiments of the present application; Figure 3 One of the structural schematic diagrams of the laser cutting path of the laser optical path control system provided in some embodiments of the present application; Figure 4 The second structural diagram of the laser cutting path of the laser optical path control system provided in some embodiments of the present application; Figure 5 This is one of the structural schematic diagrams of the first reflector of the laser light path control system provided in some embodiments of the present application; Figure 6 This is a second structural diagram of the first reflector of the laser light path control system provided in some embodiments of the present application; Figure 7 This is a third structural diagram of the first reflector of the laser light path control system provided in some embodiments of the present application; Figure 8One of the schematic diagrams of the relationship between the laser cutting path and time of the laser optical path control system provided in one embodiment of the present application; Figure 9 This is a second schematic diagram of the relationship between the laser cutting path and time of the laser optical path control system provided in one embodiment of the present application.

[0015] Reference numerals: Laser optical path control system 1; A first reflector 10, a first reflecting mirror 110, a first driver 120, a first unidirectional motor 121, and a reflecting surface 130; A second reflector 20, a second reflecting mirror 210, a second driver 220, a second unidirectional motor 221, and a planetary gear 222; Laser generator 30; Tape transport speed V. DETAILED DESCRIPTION

[0016] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0017] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0018] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0019] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0020] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0021] The term "multiple" used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two (including two) groups, and "multiple sheets" refers to more than two (including two) sheets.

[0022] The battery cells mentioned in the embodiments of this application may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application do not limit this. The battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0023] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or battery pack. A battery generally includes a casing that encloses one or more battery cells or multiple battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0024] A battery cell includes a casing, an electrode assembly, and an electrolyte. The casing is used to hold the electrode assembly and the electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet consists of a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector uncoated with the negative active material layer protrudes from the negative current collector coated with the negative active material layer. The negative current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. To ensure that high currents can pass without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together.

[0025] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0026] The inventors found that in the related art, long tabs are mainly cut by laser cutting. Laser cutting uses a galvanometer to control the laser beam, but the inertia of the galvanometer itself will cause errors and lags in the laser light path at the turning point and reciprocating motion, thereby affecting the cutting accuracy and efficiency of the tabs. There is room for improvement.

[0027] Based on the above considerations, in order to solve the problem of the inertia of the galvanometer itself affecting the cutting accuracy and efficiency, the inventors conducted in-depth research and designed a laser optical path control system. In the laser optical path control system with this structure, the problem of the inertia of the galvanometer itself affecting the cutting accuracy and efficiency can be solved.

[0028] In addition, the laser optical path control system with this structure can achieve precise control of the cutting line, which helps to improve the cutting accuracy and efficiency of the tabs while reducing costs.

[0029] For the convenience of description, the following embodiments are described by taking a laser light path control system according to an embodiment of the present application as an example.

[0030] like Figures 1-4 As shown, Figure 1This is one of the structural diagrams of the laser light path control system 1 provided in one embodiment of the present application. Figure 2 This is a second structural diagram of a laser light path control system 1 provided in one embodiment of the present application. Figure 3 This is one of the structural schematic diagrams of the laser cutting path of the laser light path control system 1 provided in one embodiment of the present application. Figure 4 This is a second structural diagram of the laser cutting path of the laser light path control system 1 provided in one embodiment of the present application.

[0031] The laser optical path control system 1 includes: a first reflector 10, a second reflector 20 and a laser generator 30, wherein the first reflector 10 includes a first reflector 110 and a first driver 120 that is dynamically coupled to the first reflector 110, and the first driver 120 is used to drive the first reflector 110 to rotate along the rotation axis; the second reflector 20 includes a second reflector 210 and a second driver 220 that is dynamically coupled to the second reflector 210, and the second driver 220 is used to drive the second reflector 210 to rotate along the rotation axis; the laser generator 30 is used to emit laser light to one of the first reflector 110 and the second reflector 210, and one of the first reflector 110 and the second reflector 210 is used to reflect laser light to the other of the first reflector 110 and the second reflector 210.

[0032] The laser emitted by the laser generator 30 reaches the preset plane after passing through the first reflector 10 and the second reflector 20, wherein the first reflector 10 and the second reflector 20 both rotate along their respective rotation axes. The laser changes direction during the rotation of the first reflector 10 and the second reflector 20, thereby changing the landing point of the laser on the preset plane.

[0033] The laser optical path control system 1 can be used for tab cutting. A laser cutting path can be formed on the tab by rotating the first reflector 10 and the second reflector 20. A coordinate system is established on the surface of the tab, with the length direction of the tab defined as the X-axis and the width direction of the tab defined as the Y-axis. The first reflector 10 and the second reflector 20 control the laser cutting on the X-axis and Y-axis respectively, wherein the reflector for receiving the laser from the laser generator 30 corresponds to the laser cutting on the X-axis, and the reflector for reflecting the laser onto the tab corresponds to the laser cutting on the Y-axis. The combination of the two forms a laser cutting path on the tab.

[0034] In addition, the first reflector 110 and the second reflector 210 are both plane reflectors. The first reflector 110 includes a plurality of reflective surfaces 130 connected end to end around the rotation axis, and the plurality of reflective surfaces 130 are symmetrically arranged relative to the rotation axis. The shape of the reflective surface 130 includes but is not limited to a rectangle.

[0035] Each reflective surface 130 of the first reflective mirror 110 corresponds to a cutting of the laser on the X-axis or Y-axis. After completing a cutting by a reflective surface 130 corresponding to the laser generator 30, the first reflective mirror 110 rotates along the rotation axis to rotate the next reflective surface 130 to the position of the previous reflective surface 130, thereby achieving repeated cutting, and the landing point position of the laser on the first reflective mirror 110 remains unchanged. The rotation of the first reflective mirror 110 can change the reflection angle of the laser with the same reflective surface 130, thereby achieving a cutting of the laser on the X-axis or Y-axis through one reflective surface 130.

[0036] In addition, the rotation directions of the multiple reflective surfaces 130 of the first reflector 110 are the same. On the same reflective surface 130, the laser completes a cutting, and the cutting paths corresponding to different reflective surfaces 130 are the same, and each cutting path is from the starting point to the end point. In other words, the cutting path corresponding to the first reflector 110 is a straight line parallel to the corresponding axis. During one cutting process, the laser moves from the starting point to the end point of the cutting path. During the next cutting process, the laser moves from the starting point to the end point of the same cutting path. Each cutting corresponding to the first reflector 110 forms the same cutting path.

[0037] The second reflector 210 has only one reflective plane. The reflective plane of the second reflector 210 and the reflective surface 130 of the first reflector 110 correspond to different axes of cutting paths. The laser light passing through the first reflector 110 moves along the rotation axis of the second reflector 210 on the reflective plane of the second reflector 210 as the reflective surface 130 rotates. That is, the landing point position of the laser light on the first reflector 110 is constantly changing, but the constantly changing landing point position corresponds to the cutting path of the first reflector 110 and does not affect the cutting path of the second reflector 210.

[0038] The second reflector 210 rotates along the rotation axis, but the rotation angle is limited, and the rotation direction of the second reflector 210 will change. After the laser reflected by the second reflector 210 completes one cutting, the second reflector 210 starts to rotate in the opposite direction to perform the next cutting, and the laser movement directions of the two cuttings are different. In other words, the end point of the cutting path formed by the previous cutting is the end point of the cutting path formed by the next cutting, and each cutting corresponding to the second reflector 210 includes two cutting paths with different movement directions.

[0039] In addition, if Figure 3 and Figure 4As shown, X-axis cutting and Y-axis cutting are performed simultaneously, forming a cutting path on a preset plane. The cutting path is a curve, and the Y-axis cutting path is also related to the tape speed V. Taking the first reflector 10 for controlling the laser cutting on the X-axis and the second reflector 20 for controlling the laser cutting on the Y-axis as an example, the cutting path A and the cutting path B correspond to one cutting respectively. Without considering the tape speed V, the static laser cutting path is as follows Figure 3 As shown, considering the tape speed V, the dynamic laser cutting path is as follows Figure 4 shown.

[0040] The laser performs return cutting in the Y-axis direction and repeating cutting in the X-axis direction. In other words, the rotation direction of the second reflector 20 corresponding to the Y-axis cutting path is bidirectional, and the rotation direction of the first reflector 10 corresponding to the X-axis cutting path is unidirectional.

[0041] In this embodiment, the laser light path control system 1 has multiple layout modes, including but not limited to: In example one, the laser generator 30 emits laser light toward the first reflecting mirror 110 , and the first reflecting mirror 110 reflects the laser light toward the second reflecting mirror 210 .

[0042] like Figure 1 As shown, the laser generator 30, the first reflector 10 and the second reflector 20 are arranged sequentially along the optical path direction. The laser generated by the laser generator 30 is emitted to the first reflector 110, reflected by the first reflector 110 to the second reflector 210, and then reflected by the second reflector 210 to the preset plane.

[0043] Among them, the first reflector 10 is used to control the laser cutting on the X-axis, and the second reflector 20 is used to control the laser cutting on the Y-axis. The two are combined to form a laser cutting path on the pole ear, and the first reflector 110 and the second reflector 210 are both plane reflectors. The first reflector 110 includes multiple reflective surfaces 130 connected in sequence around the rotation axis, and the multiple reflective surfaces 130 are symmetrically arranged relative to the rotation axis.

[0044] Each reflective surface 130 of the first reflective mirror 110 corresponds to a cutting path of the laser on the X-axis. After completing a cutting operation through a reflective surface 130 corresponding to the laser generator 30, the first reflective mirror 110 rotates along the rotation axis to rotate the next reflective surface 130 to the position of the previous reflective surface 130, thereby achieving repeated cutting, and the landing point position of the laser remains unchanged. The rotation of the first reflective mirror 110 can change the reflection angle of the laser with the same reflective surface 130, thereby achieving a single cutting path of the laser on the X-axis through one reflective surface 130.

[0045] In addition, the rotation directions of the multiple reflective surfaces 130 of the first reflector 110 are the same. On the same reflective surface 130, the laser completes a cutting on the X-axis. The X-axis cutting paths corresponding to different reflective surfaces 130 are the same, and each cutting path is from the starting point to the end point. In other words, the cutting path corresponding to the first reflector 110 is a straight line parallel to the X-axis. During one cutting process, the laser moves from the starting point to the end point of the cutting path. During the next cutting process, the laser moves from the starting point to the end point of the same cutting path. Each cutting corresponding to the first reflector 110 forms the same cutting path.

[0046] The second reflector 210 has only one reflecting plane, and the second reflector 210 rotates along the rotation axis, but the rotation angle is limited, and the rotation direction of the second reflector 210 will change. After the laser reflected by the second reflector 210 completes one cutting, the second reflector 210 starts to rotate in the opposite direction to perform the next cutting, and the laser movement directions of the two cuttings are different. In other words, the cutting path corresponding to the second reflector 210 is a straight line parallel to the Y-axis, and the end point of the cutting path formed by the previous cutting is the end point of the cutting path formed by the next cutting. Each cutting corresponding to the second reflector 210 includes two cutting paths with different movement directions.

[0047] In the second example, the laser generator 30 emits laser light toward the second reflecting mirror 210 , and the second reflecting mirror 210 reflects the laser light toward the first reflecting mirror 110 .

[0048] The laser generator 30, the second reflector 20 and the first reflector 10 are arranged sequentially along the optical path. The laser generated by the laser generator 30 is emitted to the second reflector 210, reflected by the second reflector 210 to the first reflector 110, and then reflected by the first reflector 110 to the preset plane.

[0049] Among them, the second reflector 20 is used to control the laser cutting on the X-axis, and the first reflector 10 is used to control the laser cutting on the Y-axis. The two are combined to form a laser cutting path on the pole ear, and the first reflector 110 and the second reflector 210 are both plane reflectors. The first reflector 110 includes multiple reflective surfaces 130 connected in sequence around the rotation axis, and the multiple reflective surfaces 130 are symmetrically arranged relative to the rotation axis.

[0050] Each reflective surface 130 of the first reflective mirror 110 corresponds to a cutting path of the laser on the Y-axis. After completing a cutting operation through a reflective surface 130 corresponding to the laser generator 30, the first reflective mirror 110 rotates along the rotation axis to rotate the next reflective surface 130 to the position of the previous reflective surface 130, thereby achieving repeated cutting, and the landing point position of the laser remains unchanged. The rotation of the first reflective mirror 110 can change the reflection angle of the laser with the same reflective surface 130, thereby achieving a single cutting path of the laser on the Y-axis through one reflective surface 130.

[0051] In addition, the rotation directions of the multiple reflective surfaces 130 of the first reflector 110 are the same. On the same reflective surface 130, the laser completes a cutting on the Y-axis. The Y-axis cutting paths corresponding to different reflective surfaces 130 are the same, and each cutting path is from the starting point to the end point. In other words, the cutting path corresponding to the first reflector 110 is a straight line parallel to the Y-axis. During one cutting process, the laser moves from the starting point to the end point of the cutting path. During the next cutting process, the laser moves from the starting point to the end point of the same cutting path. Each cutting corresponding to the first reflector 110 forms the same cutting path.

[0052] The second reflector 210 has only one reflecting plane, and the second reflector 210 rotates along the rotation axis, but the rotation angle is limited, and the rotation direction of the second reflector 210 will change. After the laser reflected by the second reflector 210 completes one cutting, the second reflector 210 starts to rotate in the opposite direction to perform the next cutting, and the laser movement directions of the two cuttings are different. In other words, the cutting path corresponding to the second reflector 210 is a straight line parallel to the X-axis, and the end point of the cutting path formed by the previous cutting is the end point of the cutting path formed by the next cutting. Each cutting corresponding to the second reflector 210 includes two cutting paths with different movement directions.

[0053] In the above description, the cutting speed and cutting path of the laser on the pole ear can be adjusted by controlling the rotational speeds of the first reflector 110 and the second reflector 210. For example, synchronously changing the rotational speeds of the first reflector 110 and the second reflector 210 can maintain the original cutting path while changing the cutting speed. For another example, asynchronously changing the rotational speeds of the first reflector 110 and the second reflector 210 can change the cutting speed and cutting path.

[0054] In related technologies, laser cutting is mainly used to cut long tabs. Laser cutting uses a galvanometer to control the laser beam, but the inertia of the galvanometer itself will cause errors and lags in the laser light path at the turning point and reciprocating motion, thereby affecting the cutting accuracy and efficiency of the tabs. There is room for improvement.

[0055] Laser cutting usually uses two galvanometers to control the movement of the laser beam in different directions, but most of the existing galvanometers are single-sided galvanometers. The reciprocating rotation of the single-sided galvanometer is usually controlled by a bidirectional motor to control the cutting path of the laser. The single-sided galvanometer will change its rotation direction during the reciprocating rotation. When the single-sided galvanometer is about to reach the end point, it will start to decelerate until the speed of the single-sided galvanometer drops to zero. Then the single-sided galvanometer starts the next cutting and accelerates in the opposite direction until the speed is the same as before deceleration. During the acceleration and deceleration process of the single-sided galvanometer, the inertia of the single-sided galvanometer can easily lead to insensitive steering, and the cutting path can easily produce errors in this rapid adjustment process, affecting the cutting accuracy and efficiency of the tabs.

[0056] In the present application, a plurality of reflecting surfaces 130 connected end to end around the rotation axis are arranged on the first reflecting mirror 110, and the area of ​​each reflecting surface 130 is the same. When the reflecting surface 130 is rotated to a preset position, it can be used to reflect the laser, and the landing point of the laser on different reflecting surfaces 130 changes in the same way. The rotation direction of the first reflecting mirror 110 will not change, which helps to reduce errors and improve the cutting accuracy and efficiency of the tabs.

[0057] According to some embodiments of the present application, referring to Figure 2 The first driver 120 includes a first unidirectional motor 121, and the first unidirectional motor 121 is used to drive the first reflector 110 to rotate along the rotation axis.

[0058] In this embodiment, the output end of the first unidirectional motor 121 is power-coupled with the first reflector 110, and the rotation axis of the first reflector 110 coincides with the rotation axis of the output end of the first unidirectional motor 121. The first unidirectional motor 121 is used to drive the first reflector 110 to rotate along the rotation axis, and the rotation direction of the first reflector 110 remains unchanged.

[0059] According to some embodiments of the present application, referring to Figure 2 The second driver 220 includes a second unidirectional motor 221, and the second unidirectional motor 221 is used to drive the second reflector 210 to rotate along the rotation axis.

[0060] In this embodiment, the second driver 220 is power-coupled to the second reflector 210 . The second driver 220 may include a second unidirectional motor 221 . The second reflector 210 is power-coupled to the output end of the second unidirectional motor 221 .

[0061] According to some embodiments of the present application, referring to Figure 2 The second driver 220 may further include a planetary gear 222 , and the second reflector 210 is power-coupled with an output end of the second unidirectional motor 221 and one of the planetary gears 222 .

[0062] In this embodiment, the second driver 220 is power-coupled with the second reflector 210 . The second driver 220 may include a second unidirectional motor 221 and a planetary gear 222 . The second reflector 210 may be selectively power-coupled with one of the second unidirectional motor 221 and the planetary gear 222 .

[0063] The existing technology usually controls the reciprocating rotation of the galvanometer through a bidirectional motor. The present application replaces the bidirectional motor with a unidirectional motor and planetary gears, which can achieve the change of rotation direction, help simplify the control unit, and thus reduce costs.

[0064] like Figure 1 and Figure 2 As shown, there are multiple ways to connect the second reflector 210 and the second driver 220, including but not limited to: In example one, the second reflector 210 may be connected to the output end of the second unidirectional motor 221 through a power coupling.

[0065] like Figure 1 As shown, when the target rotation direction of the second reflector 210 is the same as the rotation direction of the output end of the second unidirectional motor 221 , the second reflector 210 can be power-coupled to the output end of the second unidirectional motor 221 .

[0066] Example 2: The second reflector 210 is connected to the planetary gear 222 by power coupling.

[0067] like Figure 2 As shown, when the target rotation direction of the second reflector 210 is opposite to the rotation direction of the output end of the second unidirectional motor 221, the planetary gear 222 can be engaged through the clutch. At this time, the planetary gear 222 is connected between the second reflector 210 and the output end of the second unidirectional motor 221, and the second reflector 210 is power-coupled with the planetary gear 222. The planetary gear 222 is power-coupled with the output end of the second unidirectional motor 221, thereby changing the rotation direction of the second reflector 210 through the planetary gear 222.

[0068] According to some embodiments of this application, see Figure 1 and Figure 2 As shown, the laser generator 30 is used to emit laser light toward the first reflecting mirror 110 , and the first reflecting mirror 110 is used to reflect the laser light toward the second reflecting mirror 210 .

[0069] In this embodiment, the laser generator 30, the first reflector 10 and the second reflector 20 are arranged sequentially along the optical path direction. The laser generated by the laser generator 30 is emitted to the first reflector 110, reflected by the first reflector 110 to the second reflector 210, and then reflected to the preset plane by the second reflector 210.

[0070] The first reflector 10 is used to control the laser cutting on the X-axis, and the second reflector 20 is used to control the laser cutting on the Y-axis. The X-axis corresponds to the length direction of the tab, and the Y-axis corresponds to the width direction of the tab.

[0071] like Figure 1 As shown, the multiple reflective surfaces 130 of the first reflector 110 have the same rotation direction. On the same reflective surface 130, the laser completes a cutting on the X-axis. The X-axis cutting paths corresponding to different reflective surfaces 130 are the same, and each cutting path is from the starting point to the end point. In other words, the cutting path corresponding to the first reflector 110 is a straight line parallel to the X-axis. During one cutting process, the laser moves from the starting point to the end point of the cutting path. During the next cutting process, the laser moves from the starting point to the end point of the same cutting path. Each cutting corresponding to the first reflector 110 forms the same cutting path.

[0072] like Figure 1 As shown, the second reflector 210 has only one reflecting plane, and the second reflector 210 rotates along the rotation axis, but the rotation angle is limited, and the rotation direction of the second reflector 210 will change. After the laser reflected by the second reflector 210 completes one cutting, the second reflector 210 starts to rotate in the opposite direction to perform the next cutting, and the laser movement directions of the two cuttings are different. In other words, the cutting path corresponding to the second reflector 210 is a straight line parallel to the Y-axis, and the end point of the cutting path formed by the previous cutting is the end point of the cutting path formed by the next cutting. Each cutting corresponding to the second reflector 210 includes two cutting paths with different movement directions.

[0073] According to some embodiments of the present application, referring to Figure 1 The first reflector 110 is a polygonal prism structure, and the side surfaces of the polygonal prism structure form multiple reflective surfaces 130.

[0074] In this embodiment, the first reflector 110 can be a structure such as a polygonal prism. Taking the polygonal prism structure as an example, the polygonal prism structure includes multiple side surfaces connected in sequence, thereby forming multiple reflective surfaces 130 connected in sequence end to end around the rotation axis, and the multiple reflective surfaces 130 are symmetrically arranged relative to the rotation axis, and the area of ​​each reflective surface 130 is the same. In other words, the reflection path of the laser on different reflective surfaces 130 is the same, and the cutting path on the pole ears corresponding to different reflective surfaces 130 is also the same.

[0075] According to some embodiments of the present application, see Figure 1 As shown, the second reflector 210 is a single-sided galvanometer mirror.

[0076] In this embodiment, one surface of the galvanometer is coated with reflective material to form a reflective plane, which is mainly used to reflect the laser. The rotation angle of the galvanometer exists in a certain range. Within this rotation angle range, the reflective plane can reflect the laser to form a cutting path.

[0077] In addition, the cutting path of the laser on the tab can be controlled by adjusting the range of the rotation angle.

[0078] According to some embodiments of this application, please continue to refer to Figure 5-Figure 7 As shown, Figure 5 This is one of the structural diagrams of the first reflector 110 of the laser light path control system 1 provided in one embodiment of the present application. Figure 6 This is a second structural diagram of the first reflector 110 of the laser light path control system 1 provided in one embodiment of the present application. Figure 7 This is a third structural diagram of the first reflector 110 of the laser optical path control system 1 provided in one embodiment of the present application. The first reflector 110 includes multiple groups, and the multiple groups of first reflectors 110 correspond to different cutting paths.

[0079] In this embodiment, the first reflector 110 may include multiple groups, and different groups of first reflectors 110 are suitable for different tab cutting requirements. For example, different groups of first reflectors 110 have different numbers of reflective surfaces 130, and the corresponding control angle ranges and cutting paths are also different. The difference between the maximum control angle and the minimum control angle corresponding to the first reflector 110 is α.

[0080] The first reflector 110 has various structural forms, including but not limited to: In example one, the first reflector 110 may include eight reflective surfaces 130 .

[0081] like Figure 5 As shown, taking the first reflector 110 as a polygonal prism as an example, when the first reflector 110 is an octagonal prism, the first reflector 110 may include eight reflecting surfaces 130, and the difference α1 between the maximum control angle and the minimum control angle corresponding to the first reflector 110 with the octagonal prism structure is 45°, and the first reflector 110 with the octagonal prism structure is suitable for the extra long pole ear cutting at medium, high speed and medium high frequency.

[0082] In a second example, the first reflector 110 may include ten reflective surfaces 130 .

[0083] like Figure 6As shown, taking the first reflector 110 as a polygonal prism as an example, when the first reflector 110 is a decaprism, the first reflector 110 may include ten reflecting surfaces 130, and the difference α2 between the maximum control angle and the minimum control angle corresponding to the first reflector 110 with a decaprism structure is 36°, and the first reflector 110 with a decaprism structure is suitable for high-speed and high-frequency long pole ear cutting.

[0084] Example 3: The first reflector 110 may include twelve reflective surfaces 130 .

[0085] like Figure 7 As shown, taking the first reflector 110 as a polygonal prism as an example, when the first reflector 110 is a dodecaprism, the first reflector 110 may include twelve reflecting surfaces 130, and the difference α3 between the maximum control angle and the minimum control angle corresponding to the first reflector 110 with a dodecaprism structure is 30°, and the first reflector 110 with a dodecaprism structure is suitable for ultra-high speed and ultra-high frequency medium and long pole ear cutting.

[0086] According to some embodiments of the present application, the present application also provides a pole piece cutting system, including the laser optical path control system 1 of any of the above schemes.

[0087] The pole piece cutting system may include a laser light path control system 1 and a transmission device, the transmission device is used to transmit the pole piece to be cut to the cutting station, and the laser light path control system 1 is used to adjust the cutting path of the laser on the pole piece, thereby forming a pole ear after cutting the pole piece.

[0088] like Figure 8 and Figure 9 As shown, Figure 8 This is one of the schematic diagrams of the relationship between the laser cutting path and time of the laser light path control system 1 provided in one embodiment of the present application. Figure 9 This is a second schematic diagram of the relationship between the laser cutting path and time of the laser optical path control system 1 provided in one embodiment of the present application.

[0089] like Figure 8 As shown, P1 corresponds to the starting point of the laser cutting path in the figure, P2 corresponds to the end point of the laser cutting path in the figure, the dotted line in the figure is the laser cutting path of the first reflector 110, and the solid line in the figure is the ideal cutting path of the pole piece. The laser cutting path of the laser light path control system 1 of the present application is basically the same as the ideal laser cutting path, and the error is extremely small. like Figure 9 As shown, P1 corresponds to the starting point of the laser cutting path in the figure, P2 corresponds to the end point of the laser cutting path in the figure, the dotted line in the figure is the laser cutting path of the first reflector 110, and the solid line in the figure is the cutting path of the galvanometer in the prior art. The error between the laser cutting path of the galvanometer in the prior art and the ideal laser cutting path is large.

[0090] According to some embodiments of the present application, the present application also provides a battery production line, including a pole piece cutting system.

[0091] A battery production line may generally include a pole piece unwinding module, a coating and drying module, a pole piece cutting system, a winding / stacking module, a liquid injection and packaging module, and a control center. The pole piece cutting system is mainly integrated between the coating and drying module and the winding / stacking module, and is used to cut the dried continuous pole piece into a pole ear structure with a predetermined pattern.

[0092] According to some embodiments of the present application, see Figure 1-Figure 7 As shown, the present application provides a laser optical path control system 1. The laser optical path control system 1 includes: a first reflector 10, a second reflector 20 and a laser generator 30, wherein the first reflector 10 includes a first reflector 110 and a first driver 120 that is dynamically coupled to the first reflector 110, the first driver 120 is used to drive the first reflector 110 to rotate along a rotation axis, the first reflector 110 includes a plurality of reflective surfaces 130 connected end to end around the rotation axis, and the plurality of reflective surfaces 130 are symmetrically arranged relative to the rotation axis; the second reflector 20 includes a second reflector 210 and a second driver 220 that is dynamically coupled to the second reflector 210, the second driver 220 is used to drive the second reflector 210 to rotate along the rotation axis; the laser generator 30 is used to emit laser light to one of the first reflector 110 and the second reflector 210, and one of the first reflector 110 and the second reflector 210 is used to reflect laser light to the other of the first reflector 110 and the second reflector 210.

[0093] The first driver 120 includes a first unidirectional motor 121, which is used to drive the first reflector 110 to rotate along the rotation axis. The second driver 220 may also include a planetary gear 222, and the second reflector 210 is power-coupled to the output end of the second unidirectional motor 221 and one of the planetary gears 222. The second driver 220 includes a second unidirectional motor 221, which is used to drive the second reflector 210 to rotate along the rotation axis. The laser generator 30 is used to emit laser light toward the first reflector 110, and the first reflector 110 is used to reflect laser light toward the second reflector 210. The first reflector 110 includes multiple groups, and the control ranges corresponding to the multiple groups of first reflectors 110 are different.

[0094] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0095] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A laser optical path control system, characterized in that: include: A first reflector includes a first reflector and a first driver dynamically coupled to the first reflector, the first driver including a first unidirectional motor configured to drive the first reflector to rotate along a rotation axis; the first reflector includes a plurality of reflective surfaces sequentially connected end to end around the rotation axis, the plurality of reflective surfaces being symmetrically arranged relative to the rotation axis; A second reflector includes a second reflector and a second driver that is dynamically coupled to the second reflector, wherein the second driver includes a second unidirectional motor configured to drive the second reflector to rotate along a rotation axis; A laser generator is used to emit laser light toward one of the first reflecting mirror and the second reflecting mirror, wherein the one of the first reflecting mirror and the second reflecting mirror is used to reflect the laser light toward the other of the first reflecting mirror and the second reflecting mirror.

2. The laser light path control system according to claim 1, characterized in that: The second driver further includes a planetary gear, and the second reflector is power-coupled with an output end of the second unidirectional motor and one of the planetary gears.

3. The laser light path control system according to claim 1, characterized in that: The laser generator is used to emit laser light toward the first reflecting mirror, and the first reflecting mirror is used to reflect laser light toward the second reflecting mirror.

4. The laser light path control system according to any one of claims 1 to 3, characterized in that: The first reflector is a polygonal prism structure, and the side surfaces of the polygonal prism structure form the multiple reflective surfaces.

5. The laser optical path control system according to any one of claims 1 to 3, characterized in that: The second reflecting mirror is a single-sided galvanometer mirror.

6. The laser optical path control system according to any one of claims 1 to 3, characterized in that: The first reflectors include multiple groups, and the cutting paths corresponding to the multiple groups of first reflectors are different.

7. A pole piece cutting system, characterized in that: The laser light path control system comprises the laser light path control system as described in any one of claims 1 to 6.

8. A battery production line, characterized in that: Comprising the pole piece cutting system as claimed in claim 7.

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