A pole piece pressing and cutting device

Abstract

The present invention discloses a pole piece pressing and cutting device, which relates to the technical field of battery cell production. The pole piece pressing and cutting device comprises a base, a pressing and cutting roller, a limiting roller and a first driving member. The pressing and cutting roller and the limiting roller are arranged in parallel and spaced apart, and can be rotatably mounted on the base. A material passing cavity for the pole piece to pass through is formed between the pressing and cutting roller and the limiting roller. The first driving member is connected to the pressing and cutting roller by transmission. A roller cutter is arranged on the circumferential surface of the pressing and cutting roller. The roller cutter is used to abut against the limiting roller when the first driving member drives the pole piece through the material passing cavity through the pressing and cutting roller, so as to cut a crease hole on the pole piece. Compared with the prior art, the pole piece pressing and cutting device provided by the present invention adopts the pressing and cutting roller and the limiting roller arranged in parallel and spaced apart, and the roller cutter arranged on the pressing and cutting roller, so that the anode piece can be stacked continuously without being cut off, so as to avoid piercing the diaphragm and causing a short circuit of the battery cell, thereby improving the energy density of the battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of battery cell production, and in particular to a pole piece pressing and cutting device. Background Art

[0002] With the rapid rise of new energy vehicles, automakers are in urgent need of high-quality batteries. The higher the energy density of the battery cell, the longer the vehicle's range. In the current battery cell production process, the anode sheet needs to be cut before stacking. In this way, the acne generated when the anode sheet is cut can easily pierce the diaphragm, causing the battery cell to short-circuit. In addition, since the anode sheet is discontinuous, the energy density of the battery cell is generally not high.

[0003] In view of this, it is particularly important to design and manufacture a pole piece pressing and cutting device capable of cutting crease holes, especially in battery cell production. Summary of the invention

[0004] The object of the present invention is to provide an electrode sheet pressing and cutting device, which can cut crease holes on the anode sheet so that the anode sheets can be stacked continuously without being cut off, avoiding puncturing the diaphragm and causing a short circuit of the battery cell, thereby improving the energy density of the battery cell.

[0005] The present invention is achieved by adopting the following technical solutions.

[0006] A pole piece pressing and cutting device comprises a base, a pressing and cutting roller, a limiting roller and a first driving member. The pressing and cutting roller and the limiting roller are arranged in parallel and spaced apart, and can be rotatably mounted on the base. A material passing cavity for the pole piece to pass through is formed between the pressing and cutting roller and the limiting roller. The first driving member is connected to the pressing and cutting roller in a transmission manner. A roller cutter is arranged on the circumferential surface of the pressing and cutting roller. The roller cutter is used to abut against the limiting roller when the first driving member drives the pole piece to pass through the material passing cavity through the pressing and cutting roller, so as to cut a crease hole on the pole piece.

[0007] Furthermore, there are multiple roller cutters, which are arranged in parallel and at intervals along the axial direction of the pressure cutting roller.

[0008] Furthermore, there are multiple roller cutters, which are arranged in a circular array on the circumferential surface of the pressure cutting roller.

[0009] Furthermore, the roller cutter is in the shape of an elongated strip, and the length direction of the roller cutter is the same as the axial direction of the pressure cutting roller.

[0010] Furthermore, the electrode pressing and cutting device also includes a waste discharge pin. The free end of the roller cutter is provided with a accommodating hole. The waste discharge pin is installed in the accommodating hole. The waste discharge pin can be retracted into the accommodating hole when the roller cutter rotates to abut against the limiting roller. The waste discharge pin can also extend out of the accommodating hole when the roller cutter rotates to separate from the limiting roller, and eject the waste in the crease hole.

[0011] Furthermore, the waste ejector includes an ejector body and an elastic member, the elastic member is arranged in the accommodating hole, one end of the elastic member is connected to the roller cutter, and the other end is connected to the ejector body, and the ejector body can extend out or retract into the accommodating hole.

[0012] Furthermore, the pole piece pressing and cutting device also includes a waste discharge mechanism, which is installed on the base and is used to absorb waste generated by cutting the fold holes.

[0013] Furthermore, the waste discharge mechanism includes an air pump and a waste discharge box, the air pump is connected to the waste discharge box, and the waste discharge box is provided with a suction port, the position of the suction port corresponds to the position of the material transfer cavity.

[0014] Furthermore, the pole piece pressing and cutting device also includes a clamping wheel, which is rotatably mounted on the base and abuts against the pressing and cutting roller, and is used to limit the pressing and cutting roller.

[0015] Furthermore, the pole piece pressing and cutting device also includes a second driving member, which is drivingly connected to the limiting roller, and the rotation direction of the limiting roller is opposite to the rotation direction of the pressing and cutting roller.

[0016] The pole piece pressing and cutting device provided by the present invention has the following beneficial effects:

[0017] The pole piece pressing and cutting device provided by the present invention has a pressing and cutting roller and a limiting roller arranged in parallel and spaced apart, and both can be rotatably mounted on a base, a material passing cavity for the pole piece to pass through is formed between the pressing and cutting roller and the limiting roller, a first driving member is drivingly connected to the pressing and cutting roller, and a roller cutter is arranged on the circumferential surface of the pressing and cutting roller, and the roller cutter is used to abut against the limiting roller when the first driving member drives the pole piece through the material passing cavity through the pressing and cutting roller, so as to cut a crease hole on the pole piece. Compared with the prior art, the pole piece pressing and cutting device provided by the present invention can cut a crease hole on the anode piece because it adopts a pressing and cutting roller and a limiting roller arranged in parallel and spaced apart, and a roller cutter arranged on the pressing and cutting roller, so that the anode piece can be stacked continuously without being cut off, avoiding piercing the diaphragm and causing a short circuit of the battery cell, thereby improving the energy density of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A schematic diagram of the structure of the electrode sheet pressing and cutting device provided in an embodiment of the present invention for pressing and cutting an anode sheet;

[0020] Figure 2A schematic diagram of the structure of a pole piece pressing and cutting device provided in an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the structure of an anode sheet after being pressed and cut by the electrode sheet pressing and cutting device provided in an embodiment of the present invention;

[0022] Figure 4 A schematic structural diagram of a pressing and cutting roller from one perspective in a pole piece pressing and cutting device provided in an embodiment of the present invention;

[0023] Figure 5 A schematic structural diagram of a pressing and cutting roller in a pole piece pressing and cutting device provided in an embodiment of the present invention from another perspective;

[0024] Figure 6 for Figure 5 Schematic diagram of the structure of the connection between the middle roller cutter and the waste ejector pin;

[0025] Figure 7 A schematic structural diagram of a waste discharge mechanism in a pole piece pressing and cutting device provided in an embodiment of the present invention.

[0026] Icons: 100-electrode plate pressing and cutting device; 110-base; 120-pressing and cutting roller; 121-roller knife; 122-accommodating hole; 130-limiting roller; 140-first driving member; 150-second driving member; 160-waste ejector pin; 161-ejector pin body; 162-elastic member; 163-ejector part; 164-limiting part; 170-waste discharge mechanism; 171-air pump; 172-waste discharge box; 173-suction port; 180-pressure wheel; 190-material transfer cavity; 200-anode plate; 210-crease hole. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "horizontal", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0033] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The embodiment of the present invention provides a pole piece pressing and cutting device 100 for pressing and cutting pole pieces. The device can cut crease holes 210 on anode pieces 200 so that anode pieces 200 can be stacked without being cut, thereby avoiding puncturing the separator and causing a short circuit of the battery cell, and improving the energy density of the battery cell.

[0034] In this embodiment, the pole piece pressing and cutting device 100 is used in the production process of the battery cell. The pole piece pressing and cutting device 100 is used to cut out the crease hole 210 on the anode sheet 200 so that the anode sheet 200 can be folded along the straight line where the crease hole 210 is located, thereby realizing the lamination action. In this way, the process of cutting the anode sheet 200 is avoided, and the generation of acne on the anode sheet 200 is avoided, and the acne is prevented from piercing the diaphragm and causing the battery cell short circuit. Moreover, since the anode sheet 200 is continuous at this time, the energy density of the battery cell can be greatly improved. However, it is not limited to this. In other embodiments, the pole piece pressing and cutting device 100 can also be used to cut out the crease hole 210 on the cathode sheet, and the application scenario of the pole piece pressing and cutting device 100 is not specifically limited.

[0035] The electrode pressing and cutting device 100 comprises a base 110, a pressing and cutting roller 120, a limiting roller 130, a first driving member 140, a second driving member 150, a waste discharge pin 160, a waste discharge mechanism 170 and a pressing wheel 180. The pressing and cutting roller 120, the limiting roller 130, the waste discharge mechanism 170 and the pressing wheel 180 are all mounted on the base 110. The pressing and cutting roller 120 and the limiting roller 130 are arranged in parallel and spaced apart, and both can be rotatably mounted on the base 110, and both the pressing and cutting roller 120 and the limiting roller 130 can rotate relative to the base 110. The first driving member 140 is in transmission connection with the pressing and cutting roller 120, and the first driving member 140 can drive the pressing and cutting roller 120 to rotate. The second driving member 150 is in transmission connection with the limiting roller 130, and the second driving member 150 can drive the limiting roller 130 to rotate. A material passing cavity 190 for the anode sheet 200 to pass through is formed between the pressing roller 120 and the limiting roller 130, and the anode sheet 200 can be fed in a translational manner driven by the pressing roller 120 and the limiting roller 130. The pressing wheel 180 is rotatably mounted on the base 110 and abuts against the pressing roller 120. The pressing wheel 180 can rotate relative to the pressing roller 120 to press and limit the pressing roller 120 to prevent the pressing roller 120 from moving in its radial direction.

[0036] It should be noted that a roller cutter 121 is provided on the circumferential surface of the pressing and cutting roller 120. The roller cutter 121 is used to abut against the limiting roller 130 when the first driving member 140 drives the electrode sheet through the material passing cavity 190 through the pressing and cutting roller 120, so as to cut out the folding hole 210 on the anode sheet 200. The waste ejector 160 is installed on the roller cutter 121, and the waste ejector 160 is used to eject the waste in the folding hole 210. The waste ejector mechanism 170 is used to suck out the waste ejected by the waste ejector 160, that is, the waste ejector mechanism 170 is used to suck out the waste generated by cutting the folding hole 210 to prevent the waste from adhering to the anode sheet 200.

[0037] In this embodiment, the first driving member 140 drives the pressing roller 120 to rotate in a first direction, and the second driving member 150 drives the limiting roller 130 to rotate in a second direction. The first direction is opposite to the second direction, that is, the rotation direction of the pressing roller 120 is opposite to the rotation direction of the limiting roller 130. The pressing roller 120 and the limiting roller 130 work together to drive the anode sheet 200 to pass through the material passing cavity 190. Specifically, the rotation speeds of the pressing roller 120 and the limiting roller 130 are the same and remain unchanged, so that the anode sheet 200 moves at a uniform speed, ensuring that the spacing between the multiple folding holes 210 cut on the anode sheet 200 is the same, improving the lamination accuracy, and meeting the requirements of high-speed lamination.

[0038] In this embodiment, the first driving member 140 and the second driving member 150 are both motors, but this is not limited to this. In other embodiments, the first driving member 140 and the second driving member 150 can both be hydraulic motors or pneumatic motors, and there is no specific limitation on the types of the first driving member 140 and the second driving member 150.

[0039] It is worth noting that at least one group of roller cutters 121 is arranged on the circumferential surface of the pressing and cutting roller 120, and the number of roller cutters 121 in each group is multiple, and the multiple roller cutters 121 in each group are arranged in parallel and spaced along the axial direction of the pressing and cutting roller 120 to cut out multiple groups of crease holes 210 on the anode sheet 200. The number of crease holes 210 in each group is multiple, and the multiple crease holes 210 in each group are arranged in parallel and spaced on the anode sheet 200.

[0040] Specifically, the roller cutter 121 is in the shape of an elongated strip, and the length direction of the roller cutter 121 is the same as the axial direction of the pressing and cutting roller 120. The multiple roller cutters 121 in each group are located on the same straight line, so that the crease hole 210 formed on the anode sheet 200 is a rectangular hole, and the length of the crease hole 210 is much larger than the width of the crease hole 210. The multiple crease holes 210 in each group are located on the same straight line, which is the crease line. The anode sheet 200 can be folded along the crease line to achieve stacking operation.

[0041] In this embodiment, three groups of roller cutters 121 are arranged on the circumference of the pressing and cutting roller 120, each group of roller cutters 121 has five roller cutters, and the five roller cutters 121 in each group are located on the same straight line. The three groups of roller cutters 121 are arranged in a circular array on the circumference of the pressing and cutting roller 120. When the first driving member 140 drives the pressing and cutting roller 120 to rotate one circle, the pressing and cutting roller 120 can cut three groups of crease holes 210 on the anode sheet 200, and each group of crease holes 210 has five crease holes, that is, three crease lines are formed on the anode sheet 200. When the first driving member 140 drives the pressing and cutting roller 120 to rotate two circles, the pressing and cutting roller 120 can cut six groups of crease holes 210 on the anode sheet 200, that is, six crease lines are formed on the anode sheet 200. However, this is not limited to this. In other embodiments, only one group of roller cutters 121 may be provided on the circumferential surface of the pressing and cutting roller 120, or five groups of roller cutters 121 may be provided. The number of roller cutters 121 in each group may be four or six. There is no specific limitation on the number of groups of roller cutters 121 provided on the circumferential surface of the pressing and cutting roller 120 and the number of each group.

[0042] Please refer to Figure 5It should be noted that a receiving hole 122 is provided at the free end of the roller cutter 121, and a waste ejector pin 160 is installed in the receiving hole 122. The waste ejector pin 160 can be retracted into the receiving hole 122 when the roller cutter 121 rotates to abut against the limiting roller 130, so that the roller cutter 121 can cut the folding hole 210 on the anode sheet 200, thereby avoiding interference between the waste ejector pin 160 and the roller cutter 121; the waste ejector pin 160 can also extend out of the receiving hole 122 when the roller cutter 121 rotates to separate from the limiting roller 130, and eject the waste in the folding hole 210, thereby preventing the waste from being stuck in the folding hole 210 and affecting the subsequent folding of the anode sheet 200. Specifically, the receiving hole 122 is provided in the middle of the roller cutter 121, and the waste ejector pin 160 can eject the waste in the folding hole 210 from the middle of the roller cutter 121, thereby improving the waste ejection efficiency.

[0043] Please refer to Figure 6 The waste ejector 160 includes an ejector body 161 and an elastic member 162. The elastic member 162 is disposed in the receiving hole 122, one end of the elastic member 162 is connected to the roller cutter 121, and the other end is connected to the ejector body 161. The elastic member 162 can be extended or shortened, and the ejector body 161 can be extended or retracted into the receiving hole 122. Specifically, when the roller cutter 121 rotates to abut against the limiting roller 130, the ejector body 161 is retracted into the accommodating hole 122 under the abutting action of the limiting roller 130. At this time, the elastic member 162 is in a compressed state, and the roller cutter 121 cuts a crease hole 210 on the anode sheet 200; when the roller cutter 121 rotates to separate from the limiting roller 130, the limiting roller 130 no longer has an abutting effect on the ejector body 161. At this time, the elastic member 162 pops out outward under the action of its own elastic force to drive the ejector body 161 to extend out of the accommodating hole 122 and eject the waste in the crease hole 210.

[0044] In this embodiment, the elastic member 162 is a spring, and the ejector body 161 includes an ejection portion 163 and a limiting portion 164. The limiting portion 164 is fixedly connected to the ejection portion 163, and the cross-sectional area of ​​the limiting portion 164 is smaller than the cross-sectional area of ​​the ejection portion 163. The elastic member 162 is sleeved outside the limiting portion 164 and abuts against the ejection portion 163. The elastic member 162 can push the ejection portion 163 out of the accommodating hole 122 and eject the waste material in the crease hole 210. The limiting portion 164 can limit the expansion and contraction direction of the elastic member 162 to prevent the elastic member 162 from deflecting during the expansion and contraction process. However, it is not limited to this. In other embodiments, the elastic member 162 can be an elastic rubber, which can also realize the function of ejecting the waste material in the crease hole 210, and the material of the elastic member 162 is not specifically limited.

[0045] Please refer to Figure 7The waste discharge mechanism 170 includes an air pump 171 and a waste discharge box 172. The air pump 171 is connected to the waste discharge box 172, and the waste discharge box 172 is provided with a suction port 173. The position of the suction port 173 corresponds to the position of the material transfer cavity 190. The air pump 171 is used to generate negative pressure to suck the waste ejected by the waste discharge pin 160 into the waste discharge box 172 to prevent the waste from splashing and adhering to the anode sheet 200, thereby affecting the subsequent lamination operation.

[0046] It is worth noting that during the pressing and cutting process of the electrode sheet pressing and cutting device 100, the anode sheet 200 is first passed through the material passing cavity 190; then the first driving member 140 and the second driving member 150 are started to rotate the pressing and cutting roller 120 in the first direction and the limiting roller 130 in the second direction, thereby driving the anode sheet 200 to feed. During this process, when the roller cutter 121 on the pressing and cutting roller 120 rotates to a position abutting against the limiting roller 130, the roller cutter 121 cuts a crease hole 210 on the anode sheet 200, and at this time, the waste ejector pin 160 retracts into the accommodating hole 122. When the roller cutter 121 on the pressing and cutting roller 120 rotates to a position separated from the limiting roller 130, the waste ejector pin 160 extends out of the accommodating hole 122 and ejects the waste in the crease hole 210. At this time, the air pump 171 of the waste discharge mechanism 170 is started to suck out the waste and realize the pressing and cutting operation.

[0047] Furthermore, when the electrode sheet pressing and cutting device 100 completes the pressing and cutting operation, multiple groups of crease holes 210 are opened on the anode sheet 200, and the number of each group of crease holes 210 is five, that is, multiple crease lines are formed on the anode sheet 200, and the anode sheet 200 can be folded along the multiple crease lines in sequence to achieve the lamination operation. In this way, the lamination can be completed without cutting the anode sheet 200, which not only avoids the risk of acne piercing the diaphragm and causing the battery cell to be short-circuited, but also greatly improves the energy density of the battery cell.

[0048] It should be noted that in the process of laminating the battery cell, firstly, two layers of diaphragms are respectively attached to the two sides of the anode sheet 200 to form an anode diaphragm layer; then, a plurality of cathode sheets are alternately attached to the two sides of the anode diaphragm layer in turn, each cathode sheet is arranged between two adjacent crease lines, and two adjacent cathode sheets are respectively attached to the two sides of the anode diaphragm layer; then, the anode diaphragm layer and the plurality of cathode sheets are thermally compounded to form a composite electrode sheet by combining the anode sheet 200, the diaphragm and the cathode sheet; finally, the composite electrode sheet is folded, that is, the anode diaphragm layer is folded multiple times along the crease line to wrap the plurality of cathode sheets in the anode diaphragm layer, and the projections of the plurality of cathode sheets are overlapped, and the lamination is completed to obtain the battery cell. In this way, the lamination accuracy is high, which meets the requirements of high-speed lamination, and since the anode sheet 200 is continuous, the battery cell short circuit can be avoided, and the energy density of the battery cell is high.

[0049] The pole piece pressing and cutting device 100 provided in the embodiment of the present invention comprises a pressing and cutting roller 120 and a limiting roller 130 which are arranged in parallel and spaced apart, and both are rotatably mounted on a base 110, a material passing cavity 190 for the pole piece to pass through is formed between the pressing and cutting roller 120 and the limiting roller 130, a first driving member 140 is transmission-connected to the pressing and cutting roller 120, a roller cutter 121 is arranged on the circumferential surface of the pressing and cutting roller 120, and the roller cutter 121 is used to abut against the limiting roller 130 when the first driving member 140 drives the pole piece to pass through the material passing cavity 190 via the pressing and cutting roller 120, so as to cut a crease hole 210 on the pole piece. Compared with the prior art, the electrode sheet pressing and cutting device 100 provided by the present invention adopts a pressing and cutting roller 120 and a limiting roller 130 arranged in parallel and spaced relation and a roller cutter 121 arranged on the pressing and cutting roller 120, so that a crease hole 210 can be cut on the anode sheet 200, so that the anode sheet 200 can be stacked continuously without being cut off, thus avoiding piercing the diaphragm and causing a short circuit of the battery cell, thereby improving the energy density of the battery cell.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pole piece pressing and cutting device, characterized in that: The invention comprises a base, a pressure cutting roller, a limiting roller and a first driving member, wherein the pressure cutting roller and the limiting roller are arranged in parallel and spaced apart, and both can be rotatably mounted on the base, a material passing cavity for the pole piece to pass through is formed between the pressure cutting roller and the limiting roller, the first driving member is drivingly connected with the pressure cutting roller, a roller cutter is arranged on the circumference of the pressure cutting roller, and the roller cutter is used to abut against the limiting roller when the first driving member drives the pole piece to pass through the material passing cavity through the pressure cutting roller, so as to cut a fold hole on the pole piece; The electrode pressing and cutting device further comprises a waste discharge mechanism, which is mounted on the base and is used to remove waste generated by cutting the fold hole; The waste discharge mechanism comprises an air pump and a waste discharge box, the air pump is connected to the waste discharge box, the waste discharge box is provided with a suction port, the position of the suction port corresponds to the position of the material transfer cavity, and the waste discharge box is arranged to be tilted downward; The electrode pressing and cutting device further comprises a waste ejector pin, a receiving hole is formed at the free end of the roller cutter, the waste ejector pin is installed in the receiving hole, the waste ejector pin can be retracted into the receiving hole when the roller cutter rotates to abut against the limiting roller, and the waste ejector pin can also extend out of the receiving hole when the roller cutter rotates to separate from the limiting roller, and eject the waste in the folding hole; The waste ejector includes an ejector body and an elastic member, wherein the elastic member is disposed in the accommodating hole, one end of the elastic member is connected to the roller cutter, and the other end is connected to the ejector body, and the ejector body can extend out of or retract into the accommodating hole; The elastic member is a spring, and the ejector body includes an ejection portion and a limiting portion, the limiting portion is fixedly connected to the ejection portion, the cross-sectional area of ​​the limiting portion is smaller than the cross-sectional area of ​​the ejection portion, and the elastic member is sleeved outside the limiting portion and abuts against the ejection portion.

2. The pole piece pressing and cutting device according to claim 1, characterized in that: There are multiple roller cutters, and the multiple roller cutters are arranged in parallel and at intervals along the axial direction of the pressure cutting roller.

3. The pole piece pressing and cutting device according to claim 1, characterized in that: The number of the roller cutters is multiple, and the multiple roller cutters are arranged on the circumferential surface of the pressure cutting roller in a ring array.

4. The pole piece pressing and cutting device according to claim 1, characterized in that: The roller cutter is in the shape of an elongated strip, and the length direction of the roller cutter is the same as the axial direction of the pressure cutting roller.

5. The pole piece pressing and cutting device according to claim 1, characterized in that: The pole piece pressing and cutting device further comprises a pressing wheel, which is rotatably mounted on the base and abuts against the pressing and cutting roller, and is used to limit the pressing and cutting roller.

6. The pole piece pressing and cutting device according to claim 1, characterized in that: The pole piece pressing and cutting device further comprises a second driving member, which is drivingly connected to the limiting roller, and the rotation direction of the limiting roller is opposite to the rotation direction of the pressing and cutting roller.

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