An electrode piece cutting mechanism and a battery cell production system

Abstract

The application discloses a kind of pole piece cutter mechanism and battery production system, it is related to battery production technical field.The pole piece cutter mechanism includes mounting piece, displacement driving part and cutting assembly, cutting assembly is connected with displacement driving part, displacement driving part is set on mounting piece, displacement driving part is used to drive cutting assembly reciprocating motion relative to mounting piece, and cutting assembly is used to cut off pole piece.The pole piece cutter mechanism provided by the application greatly improves the cutting efficiency of pole piece, and then improves the efficiency of the pole piece of battery.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production, in particular to a pole piece cutting knife mechanism and a battery cell production system. BACKGROUND

[0002] The "laminated type" battery cell of a lithium battery is stacked together by positive and negative pole pieces and a separator. Currently, it is divided into "Z-shaped" laminated pole pieces, "bag-making type" laminated pole pieces and "hot composite type" laminated pole pieces. These three laminated pole piece processes all need to make pole pieces.

[0003] In the process of making pole pieces, a cutting knife mechanism is relied on to cut continuous pole pieces. The cutting position of the cutting knife mechanism currently used in the market is relatively fixed to the mounting member. When the pole piece moves a piece width relative to the cutting position under the conveying of the conveying device, the cutting knife mechanism cuts the pole piece once. The cutting efficiency of the pole piece is completely determined by the conveying speed of the pole piece, and the cutting efficiency is limited, resulting in low pole piece making efficiency. SUMMARY

[0004] The purpose of the present application is to provide a pole piece cutting knife mechanism which can improve the cutting efficiency of the pole piece and thus improve the pole piece making efficiency.

[0005] Another purpose of the present application is to provide a battery cell production system which can improve the cutting efficiency of the pole piece and thus improve the pole piece making efficiency.

[0006] The present application provides a technical solution:

[0007] A pole piece cutting knife mechanism, comprising a mounting member, a displacement driving member and a cutting assembly, the cutting assembly is connected with the displacement driving member, the displacement driving member is arranged on the mounting member, the displacement driving member is used to drive the cutting assembly to reciprocate relative to the mounting member, and the cutting assembly is used to cut the pole piece.

[0008] Further, the pole piece cutting knife mechanism further comprises a follow-up clamping assembly, the follow-up clamping assembly is connected with the displacement driving member and is used to fix the pole piece.

[0009] Further, the follow-up clamping assembly is connected with the displacement driving member through the cutting assembly, and the follow-up clamping assembly is used to fix the pole piece before the cutting assembly contacts the pole piece under the driving of the cutting assembly.

[0010] Further, the cutting assembly comprises a cutting knife driving member, a cam and a movable cutting knife, the cutting knife driving member is connected with the displacement driving member, the cam is connected with the rotating shaft of the cutting knife driving member, one end of the movable cutting knife is rotatably arranged on the cam, and the follow-up clamping assembly is connected with the displacement driving member through the movable cutting knife.

[0011] Further, the follow-up clamping assembly comprises a follow-up clamping member and a first fixing member, the first fixing member is connected with the follow-up clamping member, and the follow-up clamping member is connected with the displacement driving member.

[0012] Further, the follow-up clamping member is a pressure regulating cylinder, and the first fixing member is connected with a piston rod of the pressure regulating cylinder.

[0013] Further, the slide film cutting mechanism further comprises a slide film assembly, the slide film assembly is connected with the displacement driving member, and is used for carrying and guiding the slide film to move along a preset direction.

[0014] Further, the slide film assembly comprises a mounting frame, a material guiding member, a fixed cutter and a second fixing member, the mounting frame is connected with the displacement driving member, the material guiding member, the fixed cutter and the second fixing member are sequentially arranged on the mounting frame along the preset direction, and the fixed cutter is used for cutting the slide film together with the cutting assembly.

[0015] Further, the displacement driving member is a linear motor.

[0016] The application further provides an electric core production system comprising the slide film cutting mechanism, the slide film cutting mechanism comprises a mounting member, a displacement driving member and a cutting assembly, the cutting assembly is connected with the displacement driving member, the displacement driving member is arranged on the mounting member, the displacement driving member is used for driving the cutting assembly to reciprocally move relative to the mounting member, and the cutting assembly is used for cutting the slide film.

[0017] Compared with the prior art, the slide film cutting mechanism provided by the application has the following advantages: the cutting assembly is connected with the mounting member through the displacement driving member, and the displacement driving member can drive the cutting assembly to reciprocally move relative to the mounting member. In actual application, the displacement driving member drives the cutting assembly to move along the conveying direction of the slide film, so that the cutting assembly can quickly move a width of the slide film relative to the slide film, i.e., reach the cutting point of the slide film, then the displacement driving member drives the cutting assembly to move in the same direction as the slide film, and the cutting assembly cuts the slide film during the movement. That is, the cutting efficiency of the slide film cutting mechanism is determined by the conveying speed of the slide film and the displacement speed of the displacement driving member, and the cutting efficiency is greatly improved. Therefore, the slide film cutting mechanism provided by the application has the following advantages: the cutting efficiency of the slide film is greatly improved, and the production efficiency of the electric core is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 The structural schematic diagram of the pole piece cutter mechanism provided for the first embodiment of the present application is shown in the figure.

[0020] Figure 2 The structural schematic diagram of the pole piece cutter mechanism provided for the first embodiment of the present application is shown in the figure. Figure 1 The connection structural schematic diagram of the slide carrier assembly, the cutting assembly and the follow-up clamping assembly is shown in the figure.

[0021] Figure 3 The structural schematic diagram of the pole piece cutter mechanism provided for the first embodiment of the present application is shown in the figure. Figure 2 The structural schematic diagram under the first visual angle is shown in the figure.

[0022] Figure legend: 100-pole piece cutter mechanism; 110-mounting piece; 130-slide carrier assembly; 131-mounting frame; 133-material guiding piece; 135-fixed cutter; 137-second fixing piece; 150-displacement driving piece; 170-cutting assembly; 171-cutter driving piece; 173-cam; 175-movable cutter; 190-follow-up clamping assembly; 191-follow-up clamping piece; 193-first fixing piece. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] It should be noted that: similar labels and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0026] In the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0027] In addition, the terms "first", "second", and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "provided", "connected" and the like should be understood broadly, for example, "connected" can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0030] First embodiment

[0031] Please refer to Figure 1 The pole piece cutter mechanism 100 provided by the embodiment is applied to a battery cell production system, and greatly improves the cutting efficiency of the pole piece through the pursuit cutting of the pole piece, thereby improving the production efficiency of the battery cell.

[0032] The pole piece cutter mechanism 100 provided by the embodiment includes a mounting piece 110, a carrier piece assembly 130, a displacement driving piece 150, a cutting assembly 170, and a follow-up clamping assembly 190. The carrier piece assembly 130, the cutting assembly 170, and the follow-up clamping assembly 190 are all connected with the displacement driving piece 150. The displacement driving piece 150 is arranged on the mounting piece 110, and is used to drive the carrier piece assembly 130, the cutting assembly 170, and the follow-up clamping assembly 190 to reciprocate in a preset direction relative to the mounting piece 110. The carrier piece assembly 130 is used to carry the pole piece and guide the pole piece to move in the preset direction. The follow-up clamping assembly 190 is used to fix the pole piece. The cutting assembly 170 is used to cut the pole piece when the follow-up clamping assembly 190 fixes the pole piece.

[0033] In the actual application of the pole piece cutting mechanism 100 to the battery cell production system, the end of the pole piece is placed on the carrier assembly 130. When the cutting starts, the pole piece moves on the carrier mechanism relative to the mounting member 110 in the preset direction under the action of the pole piece conveying mechanism of the battery cell production system. The displacement driving member 150 drives the carrier assembly 130, the cutting assembly 170 and the follow-up clamping assembly 190 to move relative to the pole piece in the direction opposite to the movement direction of the pole piece. In this process, the relative movement speed of the pole piece and the cutting assembly 170 is accelerated, and the time for the cutting assembly 170 to move to the pole piece cutting point at a distance of one piece width from the end of the pole piece is greatly shortened. When the cutting assembly 170 is aligned with the cutting point of the pole piece, the follow-up clamping assembly 190 fixes the pole piece in advance, and the cutting assembly 170 cuts off the pole piece in the state of being fixed, so as to obtain a pole piece with a piece width.

[0034] Therefore, in the actual application of the pole piece cutting mechanism 100, the cutting efficiency of the pole piece is greatly improved through the rapid alignment of the pole piece cutting point, and the efficiency of the battery cell piece production process is greatly improved. Moreover, the follow-up clamping assembly 190 fixes the pole piece before the cutting assembly 170 contacts the pole piece, which ensures the accuracy of the pole piece cutting and improves the quality of the battery cell piece production.

[0035] Considering that the time difference in the cutting process will cause alignment error, when the cutting assembly 170 is aligned with the cutting point on the pole piece, the displacement driving member 150 drives the cutting assembly 170, the carrier assembly 130 and the follow-up clamping assembly 190 to return to movement, i.e., to move at the same speed and in the same direction as the pole piece, so as to keep the cutting assembly 170 always aligned with the cutting point of the pole piece. In the embodiment, the displacement driving member 150 is a linear motor, i.e., the displacement driving member 150 drives the cutting assembly 170, the carrier assembly 130 and the follow-up clamping assembly 190 to reciprocate in the linear direction relative to the mounting member 110. In other embodiments, the displacement driving member 150 can also adopt other output forms of devices to realize the preset direction as a curve or a broken line direction, and the conveying direction of the pole piece can be adjusted accordingly.

[0036] Please refer to Figure 1 , Figure 2 and Figure 3 , the carrier assembly 130 includes a mounting bracket 131, a material guiding member 133, a fixed cutter 135 and a second fixing member 137. The mounting bracket 131 is connected with the displacement driving member 150. In the embodiment, the cutting assembly 170 is arranged on the mounting bracket 131, i.e., the cutting assembly 170 is connected with the displacement driving member 150 through the mounting bracket 131. The material guiding member 133, the fixed cutter 135 and the second fixing member 137 are sequentially arranged on the mounting bracket 131 in the preset direction, and the fixed cutter 135 is used to cut off the pole piece together with the cutting assembly 170.

[0037] The pole piece channel is provided through the guide member 133 and extends in a preset direction for the pole piece to pass through and to guide the pole piece. In addition, a plurality of extension feeding portions are provided at intervals on the feeding end of the pole piece channel, and the plurality of extension feeding portions are used to be clamped and matched with a plurality of extension feeding portions provided at intervals on the pole piece feeding mechanism in actual application, so as to ensure that the pole piece channel is stably fed during the movement of the cutting assembly 170.

[0038] The second fixing member 137 is arranged on the mounting member 110 at a position corresponding to one end of the pole piece channel, and the fixed cutter 135 is arranged between the second fixing member 137 and the guide member 133. In actual application, the end of the continuous pole piece enters the pole piece channel from the end of the pole piece channel away from the fixed cutter 135, and the pole piece moves in a preset direction under the action of the conveying device, that is, the end of the pole piece passes through the pole piece channel and sequentially passes through the fixed cutter 135 and the second fixing member 137. When the pole piece passes through the fixed cutter 135 and the second fixing member 137, the fixed cutter 135 and the second fixing member 137 are both below the pole piece. In other embodiments, the relative positions of the guide member 133, the fixed cutter 135 and the second fixing member 137 can be adjusted according to actual requirements, such as the second fixing member 137 being arranged between the guide member 133 and the fixed cutter 135.

[0039] The cutting assembly 170 includes a cutter driving member 171, a cam 173 and a movable cutter 175. The cutter driving member 171 is arranged on the mounting frame 131 of the slide assembly 130, that is, the cutter driving member 171 is connected with the displacement driving member 150 through the mounting frame 131. In this embodiment, the cutter driving member 171 is an electric motor with output torque, the cam 173 is arranged on the rotating shaft of the electric motor, and one end of the movable cutter 175 is rotatably arranged on the cam 173.

[0040] In this embodiment, the preset direction is the horizontal direction. In actual application, when the cutter driving member 171 works, the rotating shaft drives the cam 173 to rotate, and the cam 173 drives the movable cutter 175 to move up and down, so that the movable cutter 175 moves away from or approaches the fixed cutter 135 on the mounting frame 131 in the vertical direction. When the movable cutter 175 approaches the fixed cutter 135 to a certain position, the movable cutter 175 contacts the pole piece and continues to move to complete the cutting of the pole piece together with the fixed cutter 135. When the cam 173 rotates one circle under the driving of the cutter driving member 171, the movable cutter 175 completes the cutting and resetting of the pole piece once.

[0041] For the purpose of saving the installation space of the mounting frame 131 in the vertical direction, the motor is adopted as the cutter driving member 171 in the embodiment, and the cam 173 is adopted to convert the torque output by the motor into the reciprocating motion of the movable cutter 175. In other embodiments, the combination of the gear and the rack or other structures can be adopted to replace the cam 173 to convert the torque, and the oil cylinder, the air cylinder or other driving devices can be adopted as the cutter driving member 171 to replace the combination of the motor and the cam 173 to directly output the linear motion to the movable cutter 175 according to the actual application conditions.

[0042] The follow-up clamping assembly 190 includes the follow-up clamping member 191 and the first fixed member 193. The follow-up clamping member 191 is connected with the movable cutter 175, i.e. the follow-up clamping member 191 is connected with the displacement driving member 150 through the movable cutter 175, and the first fixed member 193 is connected with the follow-up clamping member 191. In actual application, the follow-up clamping member 191 moves up and down in the vertical direction under the driving of the movable cutter 175, thereby driving the first fixed member 193 to move up and down in the vertical direction, so as to make the first fixed member 193 move away from or close to the second fixed member 137 arranged on the mounting frame 131. When the first fixed member 193 moves close to the second fixed member 137 to contact the pole piece on the surface of the second fixed member 137, the first fixed member 193 continues to move downward, and the second fixed member 137 completes the clamping and fixing of the pole piece.

[0043] In the embodiment, considering the consistency of the fixing and cutting actions of the pole piece, the follow-up clamping member 191 adopts the pressure regulating cylinder. The piston rod of the pressure regulating cylinder is connected with the first fixed member 193. The internal pressure of the pressure regulating cylinder is constant in the state without external force, and the piston rod is in the maximum stroke position of extension. When the first fixed member 193 is resisted by the second fixed member 137, the resistance is transmitted to the piston rod, so that the pressure regulating cylinder is compressed, the piston rod is retracted, and the air pressure in the pressure regulating cylinder is constant, thereby ensuring the continuous clamping of the pole piece by the first fixed member 193 and the second fixed member 137. That is, the pressure regulating cylinder has the same effect as the elastic member such as the spring or the elastic sheet. However, the elastic member has the defect of elastic fatigue. Therefore, the pressure regulating cylinder is a more optimal choice.

[0044] Since the follow-up clamping member 191 and the movable cutter 175 move in unison, in order to ensure that the first fixed member 193 and the second fixed member 137 have completed the clamping and fixing of the pole piece before the movable cutter 175 contacts the pole piece, in the embodiment, when the cutter driving member 171 is in the reset state, i.e. the movable cutter 175 is farthest from the position of the pole piece in the vertical direction, the first fixed member 193 is closer to the pole piece in the vertical direction than the movable cutter 175.

[0045] In practical application, in the process that the cutter driving member 171 drives the movable cutter 175 to move close to the pole piece by the cam 173, the first fixed member 193 contacts the pole piece in advance, then the pressure regulating cylinder is gradually compressed until the movable cutter 175 contacts the pole piece and completes the cutting of the pole piece. After the pole piece is cut, the cutter driving member 171 drives the movable cutter 175 to reset, and when the movable cutter 175 is out of contact with the pole piece, the first fixed member 193 and the second fixed member 137 still clamp the cut pole piece. In the process that the movable cutter 175 resets, the piston rod of the pressure regulating cylinder is gradually extended, and when it is extended to the maximum stroke, the first fixed member 193 is out of contact with the pole piece.

[0046] In addition, in other embodiments, the follow-up clamping member 191 can also use a self-driven driving device such as an electric cylinder or an oil cylinder to actively drive the first fixed member 193. For example, if an electric cylinder is used, the first fixed member 193 is connected with the output shaft of the electric cylinder, and the electric cylinder can be directly arranged on the mounting frame 131. Before the movable cutter 175 contacts the pole piece, the electric cylinder actively drives the first fixed member 193 and the second fixed member 137 to clamp and fix the pole piece.

[0047] In practical application, the pole piece cutter mechanism 100 provided in the embodiment is used to continuously clamp the pole piece on the carrier assembly 130, and under the action of the external pole piece conveying mechanism, the pole piece moves on the fixed cutter 135 and the second fixed member 137 of the carrier assembly 130 in a preset direction. The displacement driving member 150 drives the carrier assembly 130, the cutting assembly 170 and the follow-up clamping assembly 190 to move in the preset direction and opposite to the pole piece. When the movable cutter 175 of the cutting assembly 170 and the to-be-cut point of the pole piece are aligned, the displacement driving member 150 drives the carrier assembly 130, the cutting assembly 170 and the follow-up clamping assembly 190 to move in the preset direction and at the same speed and in the same direction as the pole piece. Then, the first fixed member 193 of the follow-up clamping assembly 190 is fixed with the second fixed member 137 under the driving of the movable cutter 175 and the follow-up clamping member 191, and finally the movable cutter 175 and the fixed cutter 135 complete the cutting of the pole piece. After the pole piece is cut, the cutter driving member 171 drives the movable cutter 175 and the follow-up clamping assembly 190 to reset, and when the first fixed member 193 is out of contact with the pole piece, the displacement driving member 150 drives the carrier assembly 130, the cutting assembly 170 and the follow-up clamping assembly 190 to move in the preset direction and opposite to the pole piece again to find the next to-be-cut point of the pole piece. In this way, a plurality of pole pieces with a certain width are obtained, and the cutting of the pole piece is completed.

[0048] To sum up, the pole piece cutter mechanism 100 provided in the embodiment greatly improves the efficiency of pole piece cutting through rapid alignment with the pole piece cutting point, thereby greatly improving the efficiency of the battery cell production process. Moreover, the follow-up clamping assembly 190 fixes the pole piece before the cutting assembly 170 contacts the pole piece, ensuring the accuracy of pole piece cutting and improving the production quality. In addition, the multiple extension material receiving parts protruding at the interval of the feeding end of the pole piece channel on the material guide 133 ensure that the pole piece does not deviate from the pole piece channel during the cutting process, maintaining stable feeding.

[0049] Second embodiment

[0050] The embodiment provides a battery cell production system, which comprises a pole piece conveying mechanism, a stacking mechanism, and the pole piece cutter mechanism 100 provided in the first embodiment.

[0051] The pole piece cutter mechanism 100 greatly improves the efficiency of pole piece cutting through rapid alignment with the pole piece cutting point, and ensures the accuracy of pole piece cutting by fixing the pole piece before the cutting assembly 170 contacts the pole piece through the follow-up clamping assembly 190. Therefore, the battery cell production system provided in the embodiment has higher production efficiency and can produce battery cells with higher quality.

[0052] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall fall within the protection scope of the present application.

Claims

1. A pole piece cutter mechanism characterized by, The pole piece cutting mechanism comprises a mounting member, a displacement driving member, a cutting assembly, a carrier assembly and a following clamping assembly, the cutting assembly is connected with the displacement driving member, the displacement driving member is arranged on the mounting member, the displacement driving member is used to drive the cutting assembly to reciprocate relative to the mounting member, and the cutting assembly is used to cut the pole piece; the following clamping assembly is connected with the displacement driving member through the cutting assembly, the following clamping assembly is used to fix the pole piece to be cut before the cutting assembly contacts the pole piece under the driving of the cutting assembly; the carrier assembly is connected with the displacement driving member and is used to carry and guide the pole piece to move along a preset direction; The carrier assembly comprises a mounting frame, a material guiding member, a fixed cutter and a second fixing member, the mounting frame is connected with the displacement driving member, and the material guiding member, the fixed cutter and the second fixing member are sequentially arranged on the mounting frame along the preset direction; The cutting assembly comprises a cutter driving member, a cam and a movable cutter, the cutter driving member is connected with the displacement driving member, the cam is connected with a rotating shaft of the cutter driving member, one end of the movable cutter is rotatably arranged on the cam, and the movable cutter is used to cut the pole piece with the fixed cutter under the driving of the cam; The following clamping assembly comprises a following clamping member and a first fixing member, the first fixing member is connected with the following clamping member, the following clamping member is connected with the movable cutter, and the following clamping member is used to move under the driving of the movable cutter to drive the first fixing member to clamp and fix the pole piece to be cut before the movable cutter contacts the pole piece with the second fixing member.

2. The pole piece cutter mechanism of claim 1, wherein, The following clamping member is a pressure regulating cylinder, and the first fixing member is connected with a piston rod of the pressure regulating cylinder.

3. The pole piece cutter mechanism of claim 1, wherein, The displacement driving member is a linear motor.

4. An electrode production system characterized by comprising: The pole piece cutting mechanism comprises the pole piece cutting mechanism according to any one of claims 1-3. The pole piece cutting mechanism comprises the pole piece cutting mechanism according to any one of claims 1-3.

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