Stress relieving device and pole piece manufacturing equipment

Abstract

The utility model discloses a stress relieving device and pole piece manufacturing equipment. The stress relieving device comprises a box body and a humidifying mechanism. The box body is provided with a containing cavity, a feeding port for the pole pieces to enter the containing cavity and a discharging port for the pole pieces to leave the containing cavity. The humidifying mechanism is used for providing water vapor and / or water mist for the containing cavity. The humidity in the accommodating cavity is improved, so that the pole piece can absorb water to expand, and the internal stress of the pole piece is released. Therefore, the risk that the pole piece cracks and wrinkles due to the fact that the stress of the pole piece cannot be released is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery production, and more specifically, to a stress relief device and pole piece manufacturing equipment. Background Art

[0002] At present, lithium-ion batteries are widely used in electric vehicles, consumer electronics and other fields due to their advantages such as high energy density and long service life.

[0003] As one of the core components of lithium-ion batteries, the pole piece has an important impact on the cycle life and reliability of the battery. When the pole piece is rolled into a pole roll, the pole piece stress cannot be released due to the compression of the outer pole roll, which will cause the pole piece deformation. The thickness rebound of the inner and outer layers of the pole roll is inconsistent, which will cause the pole piece to crack, wrinkle and other problems. Therefore, the pole piece stress should be eliminated before winding the pole piece. Utility Model Content

[0004] The embodiments of the present application provide a stress relief device and a pole piece manufacturing device, which can relieve stress on a pole piece.

[0005] In a first aspect, an embodiment of the present application provides a stress relief device including a housing and a humidifying mechanism. The housing has a receiving cavity, and has a feed inlet for a pole piece to enter the receiving cavity and a discharge outlet for a pole piece to leave the receiving cavity. The humidifying mechanism is used to provide water vapor and / or water mist to the receiving cavity.

[0006] In the technical solution of the embodiment of the present application, water vapor and / or water mist is provided into the accommodation cavity by a humidifying mechanism to increase the humidity in the accommodation cavity, so that the pole piece can absorb water and expand, thereby releasing the internal stress of the pole piece, thereby reducing the risk of cracking and wrinkling of the pole piece due to the inability to release the stress of the pole piece.

[0007] According to some embodiments of the present application, the humidifying mechanism includes a humidifying component and a first connecting pipe, the humidifying component is located outside the box, an air inlet is provided on the wall of the box, and the first connecting pipe connects the humidifying component and the air inlet.

[0008] In the above solution, the humidifying component is located outside the box, which is convenient for installation and maintenance of the humidifying component, and the humidifying component is connected to the air inlet through the first connecting pipe, so that the water vapor and / or water mist discharged by the humidifying component can enter the accommodating chamber through the first connecting pipe, and the structure is simple and easy to implement.

[0009] According to some embodiments of the present application, along the direction of gravity, the box body has an upper wall and a lower wall that are arranged opposite to each other, and the air inlet is arranged on the lower wall.

[0010] In the above scheme, along the direction of gravity, the box body has an upper wall and a lower wall arranged opposite to each other, that is, along the direction of gravity, the pole piece is located between the upper wall and the lower wall. Since the density of water vapor is less than that of air, and the air inlet is arranged on the lower wall, after the water vapor enters the accommodating cavity through the air inlet, it can move toward the pole piece, thereby liquefying and being absorbed by the pole piece.

[0011] According to some embodiments of the present application, along the first direction, the box body has two first walls arranged opposite to each other. The feed port and the discharge port are respectively arranged on the two first walls. There are multiple air inlets arranged along the first direction, and the first direction is perpendicular to the gravity direction.

[0012] In the above scheme, the feed port and the discharge port are respectively arranged on two first walls arranged opposite to each other along the first direction, and the air inlet is a plurality of air inlets arranged along the first direction, so that the air inlet can be distributed on the lower wall along the running direction of the pole piece, thereby allowing the water vapor provided by the humidifying component to enter the accommodating cavity more evenly, so that the water vapor can be more evenly liquefied on the pole piece and absorbed by the pole piece. In addition, the pole piece can release stress more evenly.

[0013] According to some embodiments of the present application, the stress relief device further includes a dehumidification mechanism, which is used to drive water vapor and / or water mist to leave the accommodating cavity.

[0014] In the above scheme, the dehumidification mechanism can drive water vapor and / or water mist to leave the accommodation chamber, so as to drive water vapor and / or water mist to leave the accommodation chamber when the pole piece stops running in the box, thereby reducing the risk of excessive expansion of the pole piece due to excessive moisture adhering to the surface of the pole piece.

[0015] According to some embodiments of the present application, the dehumidification mechanism includes a dehumidification component and a second connecting pipe, the dehumidification component is located outside the box, an air outlet is provided on the wall of the box, and the second connecting pipe connects the dehumidification component and the air outlet.

[0016] In the above scheme, the dehumidification component is located outside the box, which is convenient for installation and maintenance of the dehumidification component, and is convenient for exhausting air with water vapor and / or water mist to the outside. The dehumidification component is connected to the air outlet through the second connecting pipe. So that the dehumidification component can drive the water vapor and / or water mist in the accommodating cavity to leave the accommodating cavity through the second connecting pipe, the structure is simple and easy to implement.

[0017] According to some embodiments of the present application, the air outlet is arranged on the upper wall.

[0018] In the above scheme, since the density of water vapor is lower than that of air and the air outlet is arranged on the upper wall, the water vapor will continue to approach the air outlet after leaving the electrode, so that the water vapor can be more easily driven by the dehumidification component to leave the accommodating cavity.

[0019] According to some embodiments of the present application, along the first direction, the box has two first walls arranged opposite to each other, and the feed port and the discharge port are respectively arranged on the two first walls. There are multiple air outlets arranged along the first direction, and the first direction is perpendicular to the gravity direction.

[0020] In the above scheme, the feed inlet and the discharge outlet are respectively arranged on two first walls arranged opposite to each other along the first direction, and the air outlet is a plurality of air outlets arranged along the first direction, so that the air outlets can be distributed on the upper wall along the running direction of the electrode piece, so that the dehumidification component can more evenly drive the water vapor in the accommodating chamber to leave the accommodating chamber, so as to reduce the risk of excessive water vapor liquefying on the surface of part of the electrode piece due to the high water vapor content in part of the space of the accommodating chamber, causing excessive expansion of part of the electrode piece, when the electrode piece stops running in the box.

[0021] According to some embodiments of the present application, the stress relief device further includes a plurality of conveying rollers, which are disposed in the box body and are used to convey the pole pieces.

[0022] In the above scheme, there are multiple conveying rollers. By arranging multiple conveying rollers, the pole piece can fully utilize the space in the box, so that the stress relief device can simultaneously relieve stress on a pole piece with a larger area.

[0023] According to some embodiments of the present application, the plurality of conveying rollers include a row of upper conveying rollers and a row of lower conveying rollers distributed along the direction of gravity, and the upper conveying rollers and the lower conveying rollers are alternately arranged along the running direction of the pole piece.

[0024] In the above scheme, by alternately arranging the upper conveyor rollers and the lower conveyor rollers along the running direction of the pole piece, when the pole piece is alternately wound on the upper conveyor rollers and the lower conveyor rollers, the space in the box can be fully utilized, so that the stress relief device can simultaneously relieve stress on a larger area of ​​the pole piece. The design of a row of upper conveyor rollers and a row of lower conveyor rollers is simple in structure and easy to implement.

[0025] According to some embodiments of the present application, the plurality of conveying rollers further include a feed conveying roller disposed at the feed port and a discharge conveying roller disposed at the discharge port.

[0026] In the above scheme, the feed conveyor rollers arranged at the feed port and the discharge conveyor rollers arranged at the discharge port can perform structural positioning of the pole piece, thereby reducing the risk of friction between the pole piece and the feed port and the discharge port.

[0027] In a second aspect, an embodiment of the present application provides a pole piece manufacturing device having a stress relief device provided by any embodiment of the first aspect.

[0028] In the above technical solution, since the pole piece manufacturing equipment has the stress relief device in the first aspect embodiment, the pole piece manufacturing equipment also has the beneficial effects in the first aspect embodiment. Specifically, the stress relief device in the pole piece manufacturing equipment provides water vapor and / or water mist into the accommodation cavity through a humidifying mechanism to increase the humidity in the accommodation cavity, so that the pole piece can absorb water and expand, thereby releasing the internal stress of the pole piece. This reduces the risk of cracking and wrinkling of the pole piece due to the inability to release the stress of the pole piece.

[0029] According to some embodiments of the present application, the pole piece manufacturing equipment further includes a rolling device and a die-cutting device. Along the running direction of the pole piece, the rolling device, the stress relief device and the die-cutting device are arranged in sequence.

[0030] In the above technical solution, the rolling device, stress relief device and die-cutting device are arranged in sequence, so that the pole piece manufacturing equipment can roll the pole piece, relieve stress, and cut the pole piece into a suitable length for winding in sequence. The sequentially arranged structural design is simple in structure and easy to implement.

[0031] According to some embodiments of the present application, the pole piece manufacturing equipment further includes a first thickness measuring piece and a second thickness measuring piece. Along the running direction of the pole piece, the first thickness measuring piece is located between the roller device and the feed port, and the second thickness measuring piece is located between the discharge port and the die-cutting device. The first thickness measuring piece and the second thickness measuring piece are both used to detect the thickness of the pole piece.

[0032] In the above technical solution, the first thickness measuring piece and the second thickness measuring piece are both used to detect the thickness of the electrode piece, and the first thickness measuring piece is located between the rolling roller device and the feed port to detect the thickness of the electrode piece after being rolled; the second thickness measuring piece is located between the discharge port and the die-cutting device to detect the thickness of the electrode piece after stress is released. The structure is simple and easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A cross-sectional view of a stress relief device provided for some embodiments of the present application;

[0035] Figure 2 A cross-sectional view of another stress relief device provided for some embodiments of the present application;

[0036] Figure 3 A schematic diagram of the structure of multiple conveying rollers provided in some embodiments of the present application;

[0037] Figure 4 for Figure 2 A magnified view of middle;

[0038] Figure 5 for Figure 2 Enlarged view of middle B;

[0039] Figure 6 A schematic diagram of the structure of a pole piece manufacturing device provided in some embodiments of the present application.

[0040] icon:

[0041] 1000-Pole manufacturing equipment;

[0042] 100-stress relief device;

[0043] 10-box; 101-accommodating chamber; 11-first wall; 111-feeding port; 112-discharging port; 12-upper wall; 121-air outlet; 13-lower wall; 131-air inlet;

[0044] 20-humidifying mechanism; 21-humidifying component; 22-first connecting pipe; 221-first air inlet end; 222-first air outlet end;

[0045] 30-dehumidification mechanism; 31-dehumidification component; 32-second connecting pipe; 321-second air inlet end; 322-second air outlet end;

[0046] 40-conveying roller; 41-upper conveying roller; 42-lower conveying roller; 43-feeding conveying roller; 44-discharging conveying roller;

[0047] 200-pole piece; 300-roller device; 400-first thickness measuring piece; 500-second thickness measuring piece;

[0048] Z- gravity direction; X- first direction. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0051] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0052] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection 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 this application can be understood according to specific circumstances.

[0053] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0054] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0055] The term "plurality" used in the present application refers to two or more (including two).

[0056] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0057] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0058] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0059] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0060] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0061] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0062] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0063] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0064] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may be used. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0065] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0066] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0067] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0068] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0069] When processing battery cells, multiple steps are required, including slurry preparation, coating, drying, cold pressing, die cutting, winding, hot pressing, assembly, liquid injection, and formation.

[0070] At present, for the pole pieces of battery cells, especially the negative pole pieces, due to the characteristics of their active materials, after drying and cold pressing, stress will be generated due to the different temperature and humidity of the environment of different parts of the pole pieces. Therefore, after the pole pieces are rolled into electrode assemblies through the winding process, the pole pieces inside the electrode assembly are squeezed by the pole pieces outside the electrode assembly, making it impossible to release the stress of the pole pieces inside the electrode assembly, which will cause the pole pieces to deform. The thickness rebound of the pole pieces inside and outside the electrode assembly is inconsistent, which seriously affects the cycle life and safety performance of the electrode assembly, and further seriously affects the cycle life and safety performance of the entire battery cell. In addition, when the battery cell is charged, ions will be embedded in the graphite layer, resulting in a larger interlayer spacing, that is, a thickness rebound. The chemical rebound at this time is too different from the physical rebound of the pole pieces inside the electrode assembly, which will cause interface problems such as cracking and wrinkling of the pole pieces.

[0071] In view of this, in order to eliminate the stress of the pole piece and reduce the risk of cracking and wrinkling of the pole piece, the present application provides a stress relief device, which provides water vapor and / or water mist to the pole piece after rolling through its humidification mechanism, so that the water adheres to the pole piece, so that the pole piece can absorb water and expand, thereby releasing the internal stress of the pole piece. Thereby reducing the risk of cracking and wrinkling of the pole piece due to the inability to release the stress of the pole piece.

[0072] The specific structure of the cutting device is described in detail below in conjunction with the accompanying drawings.

[0073] According to some embodiments of this application, please refer to Figure 1 , Figure 1 1 is a cross-sectional view of a stress relief device 100 according to some embodiments of the present application. The present application provides a stress relief device 100 including a housing 10 and a humidifying mechanism 20. The housing 10 has a receiving chamber 101, and has a feed port 111 for the electrode sheet 200 to enter the receiving chamber 101 and a discharge port 112 for the electrode sheet 200 to leave the receiving chamber 101. The humidifying mechanism 20 is used to provide water vapor and / or water mist to the receiving chamber 101.

[0074] The housing 10 is a component that provides the humidifying mechanism 20 with a receiving chamber 101 for receiving water vapor and / or water mist for absorption by the pole piece to release stress.

[0075] The box 10 can be in various shapes, such as a cylinder, a cuboid, etc. The box 10 can be made of a material with a certain hardness and strength (such as an aluminum alloy), so that the box 10 is not easily deformed when squeezed or collided, thereby improving the stability of the accommodating cavity 101.

[0076] In some embodiments, the box 10 may include a first part (not shown in the figure) and a second part (not shown in the figure), the first part (not shown in the figure) and the second part (not shown in the figure) cover each other, the second part (not shown in the figure) may be a hollow structure with one end open, the first part (not shown in the figure) may be a plate-like structure, the first part (not shown in the figure) covers the open side of the second part (not shown in the figure), so that the first part (not shown in the figure) and the second part (not shown in the figure) jointly define a accommodating cavity 101. Setting the box 10 as a split type is, on the one hand, conducive to cleaning the inside of the box 10 by disassembling the first part (not shown in the figure) and the second part (not shown in the figure); on the other hand, compared with the integrated box 10, the split box 10 is easier to manufacture, so it can also reduce the manufacturing cost of the box 10.

[0077] The feed port 111 is an opening on the box body 10 for the electrode sheet 200 to enter the accommodating cavity 101 , and the discharge port 112 is an opening on the box body 10 for the electrode sheet 200 to leave the accommodating cavity 101 .

[0078] It can be understood that the feed port 111 and the discharge port 112 can be on the wall of the same side of the box body 10, or the feed port 111 and the discharge port 112 can also be respectively arranged on two walls of the box body 10 arranged opposite to each other in any direction.

[0079] In the embodiment where the feed port 111 and the discharge port 112 are respectively disposed on two walls of the box body 10 disposed opposite to each other in any direction, the pole piece 200 can penetrate the box body 10 in that direction, thereby making more effective use of the space in the box body 10 .

[0080] “The humidifying mechanism 20 is used to provide water vapor and / or water mist to the accommodating chamber 101” can be understood as the humidifying mechanism 20 is used to generate water vapor and / or water mist, and the water vapor and / or water mist generated by the humidifying mechanism 20 is received by the accommodating chamber 101 of the housing 10. In this way, the movement of water vapor and / or water mist can be limited to a certain extent. On the one hand, the dispersion of water vapor and / or water mist is limited to reduce the risk of water vapor and / or water mist affecting other processes; on the other hand, the part of the pole piece 200 located in the accommodating chamber 101 can be fully in contact with water vapor and / or water mist, so as to facilitate the attachment of water to the surface of the pole piece 200 for absorption and expansion by the pole piece 200.

[0081] It can be understood that the humidifying mechanism 20 can provide water mist into the accommodating cavity 101, and the water mist particles in the water mist are directly attached to the surface of the electrode 200 for absorption and expansion by the electrode 200; or, the humidifying mechanism 20 can provide water vapor into the accommodating cavity 101, and the water vapor is liquefied in the accommodating cavity 101 and on the electrode 200 for absorption and expansion by the electrode 200.

[0082] In the embodiment where the humidifying mechanism 20 provides water vapor into the accommodating cavity 101 , the water vapor liquefies and releases heat on the surface of the pole piece 200 , and / or the water vapor liquefies and releases heat in the accommodating cavity 101 , which increases the temperature in the accommodating cavity 101 and is also beneficial to the stress release of the pole piece 200 .

[0083] It can be understood that the polymer dispersant and binder in the pole piece 200 absorb water and swell, thereby accelerating the thickness rebound and releasing the stress of the pole piece 200 .

[0084] In the above solution, water vapor and / or water mist is provided into the accommodation cavity 101 by the humidifying mechanism 20 to increase the humidity in the accommodation cavity 101, so that the pole piece 200 can absorb water and expand, thereby releasing the internal stress of the pole piece 200. This reduces the risk of cracking and wrinkling of the pole piece 200 due to the inability to release the stress of the pole piece 200.

[0085] According to some embodiments of this application, please refer to Figure 1 The humidifying mechanism 20 includes a humidifying component 21 and a first connecting pipe 22 . The humidifying component 21 is located outside the housing 10 . An air inlet 131 is provided on the wall of the housing 10 . The first connecting pipe 22 connects the humidifying component 21 and the air inlet 131 .

[0086] The humidifying component 21 is a component in the humidifying mechanism 20 for generating water vapor and / or water mist.

[0087] For example, when the humidifying component 21 is used to generate water vapor, the humidifying component 21 may be an electrically heated steam humidifier, which uses an electric heating element to heat water into water vapor, and then discharges the water vapor into the first connecting pipe 22 through a fan or airflow; when the humidifying component 21 is used to generate water mist, the humidifying component 21 may be an ultrasonic humidifier or a spray gun humidifier. It is understandable that the size of the water mist particles in the water mist should be controlled to reduce the risk of excessive rebound of the thickness of the pole piece 200 due to excessive absorption of water by the local pole piece 200.

[0088] It can be understood that the humidifying component 21 is located outside the housing 10 , so that when the humidifying component 21 is installed and maintained, there is no need to open the housing 10 , thereby facilitating the installation and maintenance of the humidifying component 21 .

[0089] The first connecting pipe 22 is a component that connects the outlet for generating water vapor and / or water mist of the humidifying component 21 and the accommodating chamber 101. Exemplarily, the first connecting pipe 22 can be made of stainless steel, copper, aluminum or rubber. The above materials all have a certain corrosion resistance. The first connecting pipe 22 made of the above materials can improve the corrosion resistance of the first connecting pipe 22, thereby reducing the risk of the first connecting pipe 22 being corroded by water vapor and water mist.

[0090] The air inlet 131 is an opening opened on the wall of the box body 10 for water vapor and / or water mist to enter.

[0091] “The first connecting pipe 22 connects the humidifying component 21 and the air inlet 131 ” may be understood as one end of the first connecting pipe 22 is connected to the air inlet 131 , and the other end of the first connecting pipe 22 is connected to the humidifying component 21 .

[0092] In the above solution, the humidifying component 21 is located outside the box 10, which is convenient for installation and maintenance of the humidifying component 21. The humidifying component 21 is connected to the air inlet 131 through the first connecting pipe 22. So that the water vapor and / or water mist discharged by the humidifying component 21 can enter the accommodating chamber 101 through the first connecting pipe 22, the structure is simple, and it is easy to implement.

[0093] According to some embodiments of this application, please refer to Figure 1 Along the gravity direction Z, the box body 10 has an upper wall 12 and a lower wall 13 that are arranged opposite to each other, and the air inlet 131 is arranged on the lower wall 13.

[0094] The Z direction in the figure represents the gravity direction Z.

[0095] The upper wall 12 and the lower wall 13 are two wall portions of the box body 10 that are perpendicular to the gravity direction Z. It can be understood that the upper wall 12 and the lower wall 13 are located below the upper wall 12 along the gravity direction Z.

[0096] It can be understood that the pole piece 200 should be located between the upper wall 12 and the lower wall 13 along the gravity direction Z. In the embodiment where the humidifying component 21 generates water vapor, since the density of water vapor is lower than that of air, the water vapor will move in the opposite direction to the gravity direction Z after entering the accommodating cavity 101.

[0097] Specifically, when the air inlet 131 is located on the lower wall 13, the direction of water vapor movement is the same as the buoyancy direction of air, and the pole piece 200 is located above the air inlet 131, so that the buoyancy of air will push the water vapor close to the pole piece 200, that is, the water vapor accelerates in the direction opposite to the gravity direction Z.

[0098] In the above solution, since the density of water vapor is lower than that of air and the air inlet 131 is arranged on the lower wall 13 , after the water vapor enters the accommodating cavity 101 through the air inlet 131 , it can move toward the pole piece 200 , thereby being liquefied and absorbed by the pole piece 200 .

[0099] According to some embodiments of this application, please refer to Figure 1 The box body 10 has two first walls 11 arranged opposite to each other along the first direction X. The feed port 111 and the discharge port 112 are respectively arranged on the two first walls 11. There are multiple air inlets 131 arranged along the first direction X, and the first direction X is perpendicular to the gravity direction Z.

[0100] The first wall 11 is a wall portion of the box body 10 that is perpendicular to the first direction X. The two first walls 11 are arranged along the first direction X in the box body 10 in an opposite direction.

[0101] The first direction X may be a running direction parallel to the pole piece 200. It can be understood that the first direction X may be a length direction of the box 10, thereby increasing the length of the portion of the pole piece 200 located in the box 10 in the running direction, thereby enabling the stress relief device 100 to simultaneously relieve stress on a larger area of ​​the pole piece 200.

[0102] It can be understood that in an embodiment in which the air inlet 131 is arranged along the first direction X, the first connecting pipe 22 has a first air inlet end 221 and multiple first air outlet ends 222, one first air inlet end 221 is connected to the humidification component 21, and multiple first air outlet ends 222 are connected to multiple air inlets 131 in a one-to-one correspondence.

[0103] In the above scheme, the feed port 111 and the discharge port 112 are respectively arranged on two first walls 11 arranged opposite to each other along the first direction X, and the air inlet 131 is a plurality of air inlets arranged along the first direction X, so that the air inlet 131 can be distributed on the lower wall 13 along the running direction of the pole piece 200, thereby allowing the water vapor provided by the humidifying component 21 to enter the accommodating cavity 101 more evenly, so that the water vapor can be more evenly liquefied on the pole piece 200 and absorbed by the pole piece 200. In addition, the pole piece 200 can release stress more evenly.

[0104] According to some embodiments of this application, please refer to Figure 2 , Figure 2 1 is a cross-sectional view of another stress relief device 100 according to some embodiments of the present application. The stress relief device 100 further includes a dehumidification mechanism 30 , which is used to drive water vapor and / or water mist to leave the accommodation chamber 101 .

[0105] “The dehumidification mechanism 30 is used to drive water vapor and / or water mist to leave the accommodation chamber 101” can be understood as the dehumidification mechanism 30 is used to drive the air in the accommodation chamber 101 to leave the accommodation chamber 101, so as to drive the water vapor and / or water mist in the air to leave the accommodation chamber 101 through the dehumidification mechanism 30. In this way, on the one hand, the discharge position of water vapor and / or water mist can be limited, so as to facilitate the collection of water vapor and / or water mist, thereby reducing the risk of water vapor and / or water mist affecting other processes. On the other hand, when the pole piece 200 stops running, the humidity in the accommodation chamber 101 can be reduced through the dehumidification mechanism 30, thereby reducing the risk of excessive expansion of the pole piece 200 due to excessive absorption of water.

[0106] In the above scheme, the dehumidification mechanism 30 can drive water vapor and / or water mist to leave the containing chamber 101, so as to drive water vapor and / or water mist to leave the containing chamber 101 when the pole piece 200 stops running in the box body 10, thereby reducing the risk of excessive expansion of the pole piece 200 due to excessive moisture adhering to the surface of the pole piece 200.

[0107] According to some embodiments of this application, please refer to Figure 2 The dehumidification mechanism 30 includes a dehumidification component 31 and a second connecting pipe 32. The dehumidification component 31 is located outside the box body 10. The wall of the box body 10 is provided with an air outlet 121. The second connecting pipe 32 connects the dehumidification component 31 and the air outlet 121.

[0108] The dehumidification component 31 is a component in the dehumidification mechanism 30 used for driving air to leave the accommodating chamber 101 .

[0109] Exemplarily, the dehumidification component 31 may be an exhaust device such as an exhaust fan or an exhaust fan.

[0110] It can be understood that the dehumidification component 31 is located outside the housing 10 , so that when the dehumidification component 31 is installed and maintained, there is no need to open the housing 10 , thereby facilitating the installation and maintenance of the dehumidification component 31 .

[0111] The second connecting pipe 32 is a component that connects the air outlet (not shown in the figure) of the dehumidification component 31 and the accommodating chamber 101. Exemplarily, the second connecting pipe 32 can be made of stainless steel, copper, aluminum or rubber. The above materials all have a certain corrosion resistance. Using the above materials to make the second connecting pipe 32 can improve the corrosion resistance of the second connecting pipe 32, thereby reducing the risk of the second connecting pipe 32 being corroded by water vapor and water mist.

[0112] The air outlet 121 is an opening opened on the wall of the box body 10 for water vapor and / or water mist to flow out.

[0113] In some embodiments, the air outlet 121 and the air inlet 131 are respectively located on two opposite walls of the box body 10 .

[0114] “The second connecting pipe 32 connects the dehumidifying component 31 and the air outlet 121 ” may be understood as one end of the second connecting pipe 32 is connected to the air outlet 121 , and the other end of the second connecting pipe 32 is connected to the dehumidifying component 31 .

[0115] In the above solution, the dehumidification component 31 is located outside the housing 10, which is convenient for installation and maintenance of the dehumidification component 31, and is convenient for exhausting air with water vapor and / or water mist to the outside. The dehumidification component 31 is connected to the air outlet 121 through the second connecting pipe 32. The dehumidification component 31 can drive the water vapor and / or water mist in the accommodating chamber 101 to leave the accommodating chamber 101 through the second connecting pipe 32, and the structure is simple and easy to implement.

[0116] According to some embodiments of this application, please refer to Figure 2 The air outlet 121 is disposed on the upper wall 12 .

[0117] It can be understood that the pole piece 200 should be located between the upper wall 12 and the lower wall 13. In the embodiment where the humidifying component 21 generates water vapor, since the density of water vapor is lower than the density of air, when the water vapor enters the accommodating chamber 101, it will move in the direction opposite to the gravity direction Z, and finally the water vapor will accumulate in the space of the accommodating chamber 101 near the upper wall 12.

[0118] Specifically, when the air outlet 121 is located on the upper wall 12 , it can preferentially drive the water vapor accumulated in the space of the accommodating chamber 101 close to the upper wall 12 to leave the accommodating chamber 101 , thereby quickly reducing the water vapor content in the accommodating chamber 101 .

[0119] In the above scheme, since the density of water vapor is lower than that of air and the air outlet 121 is arranged on the upper wall 12 , the water vapor will continue to approach the air outlet 121 after leaving the electrode 200 , thereby making it easier for the water vapor to be driven by the dehumidification component 31 to leave the accommodating cavity 101 .

[0120] According to some embodiments of this application, please refer to Figure 2 The box body 10 has two first walls 11 arranged opposite to each other, and the feed port 111 and the discharge port 112 are respectively arranged on the two first walls 11. The gas outlets 121 are arranged in a plurality along a first direction X, and the first direction X is perpendicular to the gravity direction Z.

[0121] It can be understood that in an embodiment in which the air outlets 121 are arranged along the first direction X, the second connecting pipe 32 has a second air outlet end 322 and multiple second air inlet ends 321, one second air outlet end 322 is connected to the dehumidification component 31, and the multiple second air inlet ends 321 are connected to the multiple air outlets 121 in a one-to-one correspondence.

[0122] In some embodiments, the air inlet 131 and the air outlet 121 are arranged one by one and arranged at intervals along the first direction X.

[0123] In the above scheme, the feed port 111 and the discharge port 112 are respectively arranged on two first walls 11 relatively arranged along the first direction X, and the air outlets 121 are multiple and arranged along the first direction X, so that the air outlets 121 can be distributed on the upper wall 12 along the running direction of the pole piece 200, so that the dehumidification component 31 can more evenly drive the water vapor in the accommodating cavity 101 to leave the accommodating cavity 101, so as to reduce the risk of excessive water vapor liquefying on the surface of part of the pole piece 200 due to the high water vapor content in part of the space of the accommodating cavity 101, resulting in excessive expansion of part of the pole piece 200.

[0124] According to some embodiments of this application, please refer to Figure 2 The stress relief device 100 further includes a plurality of conveying rollers 40 , which are disposed in the box body 10 and are used to convey the pole piece 200 .

[0125] In some embodiments, the conveying roller 40 rotates relative to the box body 10 to drive the pole piece 200 to move.

[0126] In other embodiments, the pole piece 200 moves along the tape running direction and drives the conveying roller 40 to rotate.

[0127] By way of example, the rotation axis of the conveying roller 40 should be perpendicular to the first direction X and the direction Z of gravity.

[0128] In the above scheme, there are multiple conveying rollers 40. By providing multiple conveying rollers 40, the pole piece 200 can fully utilize the space in the box 10, so that the stress relief device 100 can simultaneously relieve stress on a pole piece 200 with a larger area.

[0129] According to some embodiments of this application, please refer to Figure 2 , and please refer to Figure 3 , Figure 3 The schematic diagram of the structure of multiple conveying rollers 40 provided in some embodiments of the present application. The multiple conveying rollers 40 include a row of upper conveying rollers 41 and a row of lower conveying rollers 42 distributed along the gravity direction Z, and the upper conveying rollers 41 and the lower conveying rollers 42 are alternately arranged along the running direction of the pole piece 200.

[0130] The upper conveying roller 41 is a conveying roller 40 close to the upper wall 12 among the plurality of conveying rollers 40 ; the lower conveying roller 42 is a conveying roller 40 close to the lower wall 13 among the plurality of conveying rollers 40 .

[0131] It can be understood that the pole pieces 200 are alternately wound around the outer circumference of the upper conveying roller 41 and the lower conveying roller 42 in sequence to fully utilize the space of the accommodating cavity 101 in the gravity direction Z.

[0132] In the above scheme, the upper conveying rollers 41 and the lower conveying rollers 42 are alternately arranged along the running direction of the pole piece 200, so that when the pole piece 200 is alternately wound on the upper conveying rollers 41 and the lower conveying rollers 42, the space in the box 10 can be fully utilized, so that the stress relief device 100 can simultaneously relieve stress on a larger area of ​​the pole piece 200. The design of a row of upper conveying rollers 41 and a row of lower conveying rollers 42 is simple in structure and easy to implement.

[0133] According to some embodiments of this application, please refer to Figure 2 , and please refer to Figure 3-Figure 5 , Figure 4 for Figure 2 A magnified image of the middle Figure 5 for Figure 2 The plurality of conveying rollers 40 further include a feed conveying roller 43 disposed at the feed inlet 111 and a discharge conveying roller 44 disposed at the discharge inlet 112 .

[0134] The feed conveying roller 43 is a conveying roller 40 close to the feed port 111 among the plurality of conveying rollers 40 ; the discharge conveying roller 44 is a conveying roller 40 close to the discharge port 112 among the plurality of conveying rollers 40 .

[0135] In some embodiments, reference Figure 2 , Figure 3 and Figure 4 Along the gravity direction Z, the distance between the feed conveying roller 43 and the lower conveying roller 42 is smaller than the distance between the feed conveying roller 43 and the upper conveying roller 41. The pole piece 200 is wound around the outer peripheral side of the lower conveying roller 42 after passing the outer peripheral side of the feed conveying roller 43, and then alternately wound around the outer peripheral sides of the upper conveying roller 41 and the lower conveying roller 42. On the plane perpendicular to the first direction X, the edge of the orthographic projection of the feed conveying roller 43 away from the orthographic projection of the lower conveying roller 42 is located in the middle of the orthographic projection of the feed port 111. As a result, the portion of the pole piece 200 located in the feed port 111 is located in the middle of the feed port 111, thereby reducing the risk of the pole piece 200 rubbing against the edge of the feed port 111.

[0136] In some embodiments, reference Figure 2 , Figure 3 and Figure 5Along the gravity direction Z, the distance between the discharge conveying roller 44 and the upper conveying roller 41 is smaller than the distance between the discharge conveying roller 44 and the lower conveying roller 42. The pole piece 200 goes around the outer peripheral side of the upper conveying roller 41 farthest from the feed port 111 in the first direction X, and then goes around the outer peripheral side of the discharge conveying roller 44, and leaves the accommodating chamber 101 through the discharge port 112. On the plane perpendicular to the first direction X, the edge of the orthographic projection of the discharge conveying roller 44 away from the orthographic projection of the upper conveying roller 41 is located in the middle of the orthographic projection of the discharge port 112. As a result, the portion of the pole piece 200 located in the discharge port 112 is located in the middle of the discharge port 112, thereby reducing the risk of the pole piece 200 rubbing against the edge of the discharge port 112.

[0137] In the above scheme, the feed conveying roller 43 arranged at the feed port 111 and the discharge conveying roller 44 arranged at the discharge port 112 can structurally limit the pole piece 200, reducing the risk of friction between the pole piece 200 and the feed port 111 and the discharge port 112.

[0138] An embodiment of the present application provides a pole piece manufacturing device 1000 including a stress relief device 100 provided by any one of the above embodiments.

[0139] In some embodiments, the pole piece manufacturing equipment 1000 further has a control mechanism (not shown in the figure), which may be a controller. When the pole piece manufacturing equipment 1000 is running normally, the control mechanism (not shown in the figure) issues an execution command to the humidifying mechanism 20 of the stress relief device 100, so that it continuously provides water vapor and / or mist to the accommodating chamber 101. When the pole piece manufacturing equipment 1000 stops running, the control mechanism (not shown in the figure) issues a stop command to the humidifying mechanism 20 of the stress relief device 100, so that it no longer continuously provides water vapor and / or mist to the accommodating chamber 101. At the same time, the control mechanism (not shown in the figure) issues an execution command to the dehumidifying mechanism 30 of the stress relief device 100, so that it drives the water vapor and / or mist in the accommodating chamber 101 to leave the accommodating chamber 101, so as to reduce the risk of excessive expansion of the pole piece 200.

[0140] According to the pole piece manufacturing device 1000 in the embodiment of the present application, since it has the stress relief device 100 provided by any of the above embodiments, the pole piece manufacturing device 1000 also has the beneficial effects of the stress relief device 100 provided by any of the above embodiments. Specifically, the stress relief device 100 in the pole piece manufacturing device 1000 provides water vapor and / or water mist to the accommodation cavity 101 through the humidification mechanism 20 to increase the humidity in the accommodation cavity 101, so that the pole piece 200 can absorb water and expand, thereby releasing the internal stress of the pole piece 200. Thereby reducing the risk of cracking and wrinkling of the pole piece 200 due to the inability to release the stress of the pole piece 200.

[0141] According to some embodiments of this application, please refer to Figure 6 , Figure 6 A schematic diagram of the structure of a pole piece manufacturing device 1000 provided in some embodiments of the present application. The pole piece manufacturing device 1000 also includes a roller device 300 and a die-cutting device (not shown in the figure). Along the running direction of the pole piece 200, the roller device 300, the stress relief device 100 and the die-cutting device (not shown in the figure) are arranged in sequence.

[0142] The rolling device 300 is a device in the pole piece manufacturing equipment 1000 for cold pressing the pole piece 200; the die-cutting device (not shown in the figure) is a device in the pole piece manufacturing equipment 1000 for cutting the pole piece 200 for subsequent winding.

[0143] In the above technical solution, the rolling device 300, the stress relief device 100 and the die-cutting device (not shown in the figure) are arranged in sequence, so that the pole piece manufacturing equipment 1000 can roll and stress-relieve the pole piece 200 in sequence, and cut the pole piece 200 into a length suitable for winding. The sequentially arranged structural design is simple in structure and easy to implement.

[0144] According to some embodiments of this application, please refer to Figure 6 The pole piece manufacturing equipment 1000 further includes a first thickness measuring piece 400 and a second thickness measuring piece 500. Along the running direction of the pole piece 200, the first thickness measuring piece 400 is located between the roller device 300 and the feed port 111, and the second thickness measuring piece 500 is located between the discharge port 112 and the die-cutting device (not shown in the figure). The first thickness measuring piece 400 and the second thickness measuring piece 500 are both used to detect the thickness of the pole piece 200.

[0145] The thickness measuring piece is a component used to detect the thickness of the pole piece 200 , and the thickness measuring piece can be used to detect the distance of the pole piece 200 in the gravity direction Z.

[0146] The thickness measuring member may be a distance measuring ruler or an electronic thickness gauge. In the embodiment where the thickness measuring member is a thickness gauge, the thickness measuring principle of the thickness gauge includes but is not limited to a resonance method, an interference method, and a pulse reflection method. Specifically, the thickness gauge may include a camera, and the thickness gauge detects the thickness of the pole piece 200 through the camera.

[0147] In the embodiment where the pole piece manufacturing equipment 1000 further includes a control mechanism (not shown in the figure), the first thickness measuring member 400 and the second thickness measuring member 500 can also feed back the collected thickness information of the pole piece 200 to the control mechanism, and the control mechanism issues an execution command to the roller device 300 to adjust the rolling force, thereby controlling the thickness of the pole piece 200 after cold pressing. At the same time, the control mechanism issues an execution command to the humidifying mechanism 20 to adjust the amount of water vapor and / or water mist provided, thereby controlling the thickness of the pole piece 200 after stress relief.

[0148] In the above technical solution, the first thickness measuring piece 400 and the second thickness measuring piece 500 are both used to detect the thickness of the pole piece 200, and the first thickness measuring piece 400 is located between the rolling device 300 and the feed port 111 to detect the thickness of the pole piece 200 after being rolled; the second thickness measuring piece 500 is located between the discharge port 112 and the die-cutting device to detect the thickness of the pole piece 200 after stress is released. The structure is simple and easy to install.

[0149] According to some embodiments of the present application, a stress relief device 100 is provided. Figure 1-Figure 5 .

[0150] The stress relief device 100 includes a housing 10 , a humidifying mechanism 20 , a dehumidifying mechanism 30 , and a plurality of conveying rollers 40 .

[0151] The box body 10 has a receiving cavity 101, and has a feed port 111 for the electrode sheet 200 to enter the receiving cavity 101 and a discharge port 112 for the electrode sheet 200 to leave the receiving cavity 101. Along the first direction X, the box body 10 has two first walls 11 arranged opposite to each other. The feed port 111 and the discharge port 112 are respectively arranged on the two first walls 11.

[0152] The humidifying mechanism 20 is used to provide water vapor to the accommodating chamber 101. The humidifying mechanism 20 includes a humidifying component 21 and a first connecting pipe 22. The humidifying component 21 is located outside the box 10. The wall of the box 10 is provided with an air inlet 131. The first connecting pipe 22 connects the humidifying component 21 and the air inlet 131.

[0153] The dehumidification mechanism 30 is used to drive water vapor to leave the accommodating chamber 101. The dehumidification mechanism 30 includes a dehumidification component 31 and a second connecting pipe 32. The dehumidification component 31 is located outside the box body 10. The wall of the box body 10 is provided with an air outlet 121. The second connecting pipe 32 connects the dehumidification component 31 and the air outlet 121. Both the air inlet 131 and the air outlet 121 are arranged in a plurality along the first direction X.

[0154] Along the gravity direction Z, the box body 10 has an upper wall 12 and a lower wall 13 that are arranged opposite to each other. The air inlet 131 is arranged on the lower wall 13 , and the air outlet 121 is arranged on the upper wall 12 .

[0155] The plurality of conveying rollers 40 include a row of upper conveying rollers 41 and a row of lower conveying rollers 42, and the upper conveying rollers 41 and the lower conveying rollers 42 are alternately arranged along the running direction of the pole piece 200. The plurality of conveying rollers 40 also include a feed conveying roller 43 arranged at the feed port 111 and a discharge conveying roller 44 arranged at the discharge port 112.

[0156] In the above scheme, water vapor is provided into the accommodating chamber 101 through the humidifying mechanism 20 to increase the humidity in the accommodating chamber 101, so that the pole piece 200 can absorb water and expand, thereby releasing the internal stress of the pole piece 200. This reduces the risk of cracking and wrinkling of the pole piece 200 due to the inability to release the stress of the pole piece 200. At the same time, the dehumidifying mechanism 30 can drive the water vapor to leave the accommodating chamber 101, so as to drive the water vapor to leave the accommodating chamber 101 when the pole piece 200 stops running in the box 10, thereby reducing the risk of excessive expansion of the pole piece 200 due to excessive moisture adhering to the surface of the pole piece 200.

[0157] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0158] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A stress relief device, characterized in that: include: A box body, having a containing cavity, and having a feeding port for the electrode piece to enter the containing cavity and a discharging port for the electrode piece to leave the containing cavity; The humidifying mechanism is used to provide water vapor and / or water mist to the containing cavity.

2. The stress relief device according to claim 1, characterized in that The humidifying mechanism comprises a humidifying component and a first connecting pipe, and the humidifying component is located outside the box; The wall of the box body is provided with an air inlet, and the first connecting pipe connects the humidifying component and the air inlet.

3. The stress relief device according to claim 2, characterized in that Along the gravity direction, the box body has an upper wall and a lower wall that are arranged opposite to each other, and the air inlet is arranged on the lower wall.

4. The stress relief device according to claim 3, characterized in that Along the first direction, the box body has two first walls arranged opposite to each other, and the feed port and the discharge port are respectively arranged on the two first walls; The air inlets are multiple and arranged along the first direction, and the first direction is perpendicular to the gravity direction.

5. The stress relief device according to claim 3, characterized in that The stress relief device further comprises a dehumidification mechanism, and the dehumidification mechanism is used to drive water vapor and / or water mist to leave the accommodating cavity.

6. The stress relief device according to claim 5, characterized in that The dehumidification mechanism comprises a dehumidification component and a second connecting pipe, and the dehumidification component is located outside the box; The wall of the box body is provided with an air outlet, and the second connecting pipe connects the dehumidification component and the air outlet.

7. The stress relief device according to claim 6, characterized in that The air outlet is arranged on the upper wall.

8. The stress relief device according to claim 7, characterized in that Along the first direction, the box body has two first walls arranged opposite to each other, and the feed port and the discharge port are respectively arranged on the two first walls; The air outlets are multiple and arranged along the first direction, and the first direction is perpendicular to the gravity direction.

9. The stress relief device according to claim 1, characterized in that The stress elimination device also includes a plurality of conveying rollers, which are arranged in the box body and are used to convey the pole pieces.

10. The stress relief device according to claim 9, characterized in that The plurality of conveying rollers include a row of upper conveying rollers and a row of lower conveying rollers distributed along the direction of gravity, and the upper conveying rollers and the lower conveying rollers are alternately arranged along the tape running direction of the pole piece.

11. The stress relief device according to claim 10, characterized in that The plurality of conveying rollers further include a feed conveying roller disposed at the feed port and a discharge conveying roller disposed at the discharge port.

12. A pole piece manufacturing device, characterized in that: Comprising a stress relief device as claimed in any one of claims 1-11.

13. The pole piece manufacturing equipment according to claim 12, characterized in that: The pole piece manufacturing equipment also includes a rolling device and a die-cutting device; Along the running direction of the pole piece, the roller device, the stress relief device and the die-cutting device are arranged in sequence.

14. The pole piece manufacturing equipment according to claim 13, characterized in that: The pole piece manufacturing equipment also includes a first thickness measuring piece and a second thickness measuring piece; Along the running direction of the pole piece, the first thickness measuring piece is located between the rolling roller device and the feed port, and the second thickness measuring piece is located between the discharge port and the die-cutting device; The first thickness measuring piece and the second thickness measuring piece are both used to detect the thickness of the pole piece.

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