Rolling mill and battery production system

Abstract

The embodiment of the utility model provides a rolling mill and a battery production system. The rolling mill comprises a measuring mechanism and a roller mechanism. The roller mechanism comprises two supporting rollers and two working rollers, the two supporting rollers are arranged at intervals in the first direction, the two working rollers are arranged between the two supporting rollers in the first direction and arranged side by side in the first direction, and a gap allowing a plate to penetrate through is formed between the two working rollers. The two supporting rollers are used for abutting against the adjacent working rollers correspondingly, at least one of the two supporting rollers is provided with a flow channel structure allowing heat exchange media to flow, a liquid inlet flow path and a liquid outlet flow path, the liquid inlet flow path and the liquid outlet flow path communicate with the flow channel structure, the flow channel structure is located in the supporting rollers, and the area, corresponding to the flow channel structure, of the working rollers is a cooled area. The measuring mechanism is used for measuring the thickness of the plate pressed by the cooled area. The quality of rolled products can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more particularly, to a rolling mill and a battery production system. Background Art

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In the process of battery cell production, rolling mills are often used to roll plates. How to improve the quality of rolled products is a research direction in battery technology. Utility Model Content

[0004] The present application provides a rolling mill and a battery production system, which can improve the quality of rolled products.

[0005] The embodiment of the present application provides a rolling mill, including a measuring mechanism and a rolling mechanism. The rolling mechanism includes two support rollers and two working rollers, the two support rollers are arranged at intervals along a first direction, the two working rollers are arranged between the two support rollers along the first direction, and the two working rollers are arranged side by side along the first direction, a gap is formed between the two working rollers for the plate to pass through, the two support rollers are respectively used to press the working rollers adjacent to them, at least one of the two support rollers is provided with a flow channel structure for the flow of heat exchange medium and a liquid inlet flow path and a liquid outlet flow path respectively connected to the flow channel structure, the flow channel structure is located inside the support roller, and the area corresponding to the working roller and the flow channel structure is a cold area. The measuring mechanism is used to measure the thickness of the plate pressed by the cold area.

[0006] In the above technical scheme, the rolling mill of this embodiment monitors the thickness of the plate by setting a measuring mechanism, and sets a support roller with a flow channel structure. When the measuring mechanism measures that the thickness of the plate is too thin, the support roller cools the working roller, and according to the principle of thermal expansion and contraction, the diameter of at least one working roller is contracted, thereby increasing the gap between the two working rollers, improving the situation where the plate thickness is too small, and improving the quality of the products rolled by the rolling mill.

[0007] In some embodiments, the support roller has a central axis, and the flow channel structure surrounds at least a portion of the periphery of the central axis.

[0008] In the above technical solution, the flow channel structure can transfer the cold energy to the outer surface of the support roller as much as possible, thereby realizing the effective utilization of the heat exchange medium.

[0009] In some embodiments, there are multiple flow channel structures, which are arranged at intervals along the axial direction of the support roller; there are multiple liquid inlet flow paths and / or multiple liquid outlet flow paths, which are connected to the multiple flow channel structures one by one, and the multiple liquid inlet flow paths or the multiple liquid outlet flow paths are respectively connected to regulating valves, and the working roller has multiple cooling areas corresponding to the multiple flow channel structures; there are multiple measuring mechanisms, which are arranged along the axial direction of the support roller and are respectively used to measure the thickness of each part of the plate pressed by the multiple cooling areas; the rolling mill also includes a controller, and the multiple measuring mechanisms and the multiple regulating valves are all connected to the controller, and the controller is configured to control the opening of the corresponding regulating valve according to the measurement information of the measuring mechanism.

[0010] In the above technical solution, multiple flow channel structures are provided, and the flow rates of the heat exchange medium of the multiple flow channel structures are controlled separately, so that a larger size control in the width direction of the plate can be achieved, further improving the quality of the rolled product. Moreover, for plates with different thickness requirements in different regions in the width direction, they can also be rolled out by setting the opening of the regulating valve.

[0011] In some embodiments, the flow channel structure includes a first cavity, a first plate and a second plate. The first plate and the second plate both surround the central axis of the support roller. The first plate and the second plate are arranged opposite to each other and a second cavity is formed therebetween. The first cavity surrounds the central axis. The two outer peripheral ends of the first plate and the second plate facing away from the central axis are both located in the first cavity so that the second cavity is connected to the first cavity. One of the liquid inlet flow path and the liquid outlet flow path is located on the central axis of the support roller and extends along the central axis, and is connected to the second cavity and has a distance from the first cavity. The other of the liquid outlet flow path and the liquid inlet flow path is connected to the first cavity.

[0012] In the above technical solution, the flow channel structure is configured to include a first cavity, a first plate and a second plate. The heat exchange medium flows into the first cavity through the gap between the first plate and the second plate. This structure allows the heat exchange medium to flow through the periphery of the first plate and the second plate. The setting of the first cavity allows the heat exchange medium to have a larger flow rate, thereby forming a better cooling effect on the outer surface of the support roller.

[0013] In some embodiments, the flow channel structure also includes a third plate body, which surrounds the central axis and connects the two peripheral ends of the first plate body and the second plate body that are away from the central axis. The third plate body is provided with a plurality of through holes for the heat exchange medium to pass through. The plurality of through holes are arranged at intervals along the surrounding direction of the third plate body, and the first cavity and the second cavity are connected through the plurality of through holes.

[0014] In the above technical solution, a third plate body is provided, and the heat exchange medium is passed through the through holes on the third plate body. In this way, the pressure of the heat exchange medium in the second cavity can be increased, so that the heat exchange medium can be emitted from each through hole more evenly, thereby improving the cooling effect on the working roll.

[0015] In some embodiments, the number of the liquid inlet flow path or the liquid outlet flow path located at the central axis is one, and is connected to the second cavity of each flow channel structure; the number of the other of the liquid outlet flow path and the liquid inlet flow path is multiple, and the multiple liquid inlet flow paths or the multiple liquid outlet flow paths are connected one by one with the multiple first cavities, and the multiple liquid inlet flow paths or the multiple liquid outlet flow paths are respectively connected to regulating valves.

[0016] In the above technical solution, a second cavity of each flow channel structure is connected by using an inlet flow path or an outlet flow path, which can make the flow path design simpler and convenient to manufacture. The other of the outlet flow path and the inlet flow path is provided in multiple numbers, which is convenient for one-to-one connection with the regulating valve.

[0017] In some embodiments, the support roller includes a roller body and a first rotating joint, the roller body is provided with a flow channel structure, the first rotating joint is arranged at one end of the roller body, and the first rotating joint and the roller body together form a liquid inlet flow path or a liquid outlet flow path located at the central axis.

[0018] In the above technical solution, a first rotary joint is provided to facilitate the external pipeline to be connected to the flow channel structure of the roller body through the first rotary joint.

[0019] In some embodiments, the support roller includes a roller body and a second rotating joint, the roller body includes a working part and two functional parts, the working part is in contact with the working roller and is provided with a flow channel structure, the two functional parts are fixedly arranged at both ends of the working part, and the outer peripheral side of at least one functional part is surrounded by a second rotating joint, and the second rotating joint, the functional part and the working part jointly form the other of the liquid outlet flow path and the liquid inlet flow path.

[0020] In the above technical solution, a second rotary joint is provided to facilitate the external pipeline to be connected to the flow channel structure of the roller body through the second rotary joint.

[0021] In some embodiments, the flow channel structure is spirally disposed in the support roller around the central axis of the support roller.

[0022] In the above technical solution, the flow channel structure is set in a spiral form, which can simplify the flow channel structure and reduce the volume of the heat exchange medium.

[0023] In some embodiments, each measuring mechanism includes at least one pair of distance measuring sensors, the two paired distance measuring sensors are arranged along a first direction and form a gap therebetween for the plate to pass through, and the two paired sensors are respectively used to measure the gap between themselves and the plate.

[0024] In the above technical solution, the thickness of the plate is measured by two paired distance measuring sensors, and the measurement result is relatively accurate.

[0025] In some embodiments, the rolling mill includes a refrigeration mechanism, which is connected to the liquid inlet flow path and the liquid outlet flow path and is used to exchange heat with the heat exchange medium.

[0026] In the above technical solution, a refrigeration mechanism is provided to exchange heat with the heat exchange medium, which is more convenient to use.

[0027] In some embodiments, the diameter of the support rolls is greater than the diameter of the work rolls.

[0028] In the above technical solution, the supporting roller has a larger volume, which is not only convenient for arranging the flow channel structure, but also can accommodate more heat exchange medium, thereby improving the cooling effect of the supporting roller.

[0029] In a second aspect, an embodiment of the present application also provides a battery production system, including the above-mentioned rolling mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0031] Figure 1 A schematic diagram of the structure of a rolling mill provided in some embodiments of the present application;

[0032] Figure 2 A schematic diagram of the structure of support rollers in a rolling mill provided in some embodiments of the present application;

[0033] Figure 3 A cross-sectional view of a support roller in a rolling mill provided for some embodiments of the present application;

[0034] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0035] Figure 5 for Figure 3 Enlarged view of point B in the middle.

[0036] The reference numerals of the specific embodiments are as follows:

[0037] 100, rolling mill; 200, plate;

[0038] 1. Measuring mechanism; 11. Distance measuring sensor;

[0039] 2. Roller mechanism;

[0040] 21. Support roller;

[0041] 211, flow channel structure; 2111, first cavity; 2112, first plate; 2113, second plate; 2114, second cavity; 2115, third plate; 2116, through hole;

[0042] 212. Liquid inlet flow path;

[0043] 213, liquid outlet flow path;

[0044] 214. Central axis;

[0045] 215, roller body; 2151, working part; 2152, functional part;

[0046] 216. First rotary joint;

[0047] 217, second rotary joint;

[0048] 22. Working roll;

[0049] 23. Regulating valve;

[0050] X, first direction. DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] The term “plurality” used in this application refers to two or more (including two).

[0058] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0059] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive coating area and a positive electrode ear connected to the positive coating area. The positive coating area is coated with a positive active material layer, and the positive electrode ear is not coated with a positive active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, and the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with a negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.

[0060] In the process of manufacturing battery cells, the aluminum foil of the positive electrode plate usually needs to be rolled to make its density and thickness consistent and meet the use requirements. During the rolling process, the rollers in contact with the aluminum foil usually expand due to the increase in temperature. When the roller expands to a large extent, the thickness of the aluminum foil at that location will be too thin and will not meet the size requirements.

[0061] In view of this, the present application provides a rolling mill, which monitors the thickness of the plate by setting a measuring mechanism and setting a support roll with a flow channel structure, so as to cool the working roll and increase the gap between the two working rolls, thereby reducing the situation where the thickness of the aluminum foil is too small and improving the quality of the products rolled by the rolling mill.

[0062] Figure 1 A schematic diagram of the structure of a rolling mill provided in some embodiments of the present application; Figure 2 A schematic diagram of the structure of support rollers in a rolling mill provided in some embodiments of the present application; Figure 3 A cross-sectional view of support rollers in a rolling mill provided for some embodiments of the present application.

[0063] like Figure 1-Figure 3As shown, the rolling mill 100 includes a rolling mechanism 2 and a measuring mechanism 1. The rolling mechanism 2 includes two support rollers 21 and two working rollers 22. The two support rollers 21 are arranged at intervals along the first direction X. Along the first direction X, the two working rollers 22 are arranged between the two support rollers 21, and the two working rollers 22 are arranged side by side along the first direction X. A gap is formed between the two working rollers 22 for the plate 200 to pass through. The two support rollers 21 are respectively used to press the adjacent working rollers 22. At least one of the two support rollers 21 is provided with a flow channel structure 211 for the flow of heat exchange medium and a liquid inlet flow path 212 and a liquid outlet flow path 213 respectively connected to the flow channel structure 211. The flow channel structure 211 is located inside the support roller 21, and the area corresponding to the working roller 22 and the flow channel structure 211 is a cold area. The measuring mechanism 1 is used to measure the thickness of the plate 200 pressed by the cold area.

[0064] The measuring mechanism 1 of this embodiment may be an ultrasonic distance measuring sensor, which is disposed on one side of the plate 200 and calculates the thickness of the plate 200 by emitting ultrasonic pulses and measuring the time it takes for the ultrasonic pulses to propagate in the plate 200 .

[0065] In this embodiment, a flow channel is formed inside the flow channel structure 211 for the heat exchange medium to flow. The heat exchange medium can be liquid, gas, or a gas-liquid two-phase substance. Specifically, the heat exchange medium can be water or cooling oil.

[0066] In this embodiment, the area corresponding to the working roll 22 and the flow channel structure 211 refers to the area where the projection of the flow channel structure 211 along the first direction X on the working roll 22 is located.

[0067] The diameter of the support roll 21 in this embodiment may be greater than, less than, or equal to the diameter of the working roll 22 .

[0068] Along the first direction X, the support roll 21, the working roll 22, the working roll 22 and the support roll 21 are arranged in sequence, and the four are arranged side by side.

[0069] Optionally, the two support rollers 21 are each provided with a flow channel structure 211 and a liquid inlet flow path 212 and a liquid outlet flow path 213 communicating with the flow channel structure 211 .

[0070] The two working rollers 22 of this embodiment can be driven by a first driving member to rotate together, or can be driven by a first driving member to rotate respectively. The first driving member can be a motor.

[0071] The two support rollers 21 of this embodiment can be driven by a second driving member to rotate together, or can be driven by a second driving member to rotate respectively. The second driving member can be a motor.

[0072] Exemplarily, the linear speeds of the abutting support roll 21 and working roll 22 on the contact surface are equal.

[0073] The rolling mill 100 of this embodiment monitors the thickness of the plate 200 by setting a measuring mechanism 1, and sets a support roller 21 with a flow channel structure 211. When the measuring mechanism 1 measures that the thickness of the plate 200 is too thin, the support roller 21 cools the working roller 22, and according to the principle of thermal expansion and contraction, the diameter of at least one working roller 22 is contracted, thereby increasing the gap between the two working rollers 22, improving the situation where the plate thickness is too small, and improving the quality of the products rolled by the rolling mill 100.

[0074] For example, when adjusting the pressure of the support roller 21 on the working roller 22, the support roller 21 can be driven by a linear drive member such as a driving cylinder or a hydraulic cylinder to apply pressure to the working roller 22. For example, both ends of the support roller 21 are provided with bearings and bearing seats matched with the bearings, and two linear drives apply a force toward the working roller 22 to the support seats.

[0075] In some embodiments, the support roller 21 has a central axis 214 , and the flow channel structure 211 surrounds at least a portion of the circumference of the central axis 214 .

[0076] The flow channel structure 211 of this embodiment is disposed along at least a portion of the periphery of the central axis 214 of the support roller 21 , that is, the flow channel structure 211 may be disposed along a portion of the periphery of the central axis 214 , or may surround the central axis 214 at least once.

[0077] Such an arrangement allows the flow channel structure 211 to transfer the cold energy to the outer surface of the support roller 21 as much as possible, thereby achieving effective utilization of the heat exchange medium.

[0078] Optionally, the flow channel structure 211 surrounds the central axis 214. Specifically, it can be arranged in a circle around the central axis 214, or can be arranged in a spiral around the central axis 214. In this way, the entire peripheral side of the support roll 21 can transfer cold to the working roll 22, and the entire peripheral side of the corresponding area of ​​the working roll 22 can be continuously cooled, thereby effectively adjusting the expansion degree, reducing the missed area, and further improving the quality of the rolled product.

[0079] Figure 4 for Figure 3 The enlarged view of point A in the middle; Figure 5 for Figure 3 Enlarged view of point B in the middle.

[0080] See also Figure 4 and Figure 5In some embodiments, there are multiple flow channel structures 211, which are arranged at intervals along the axial direction of the support roll 21. There are multiple liquid inlet flow paths 212 and / or multiple liquid outlet flow paths 213, which are connected to the multiple flow channel structures 211 one by one. The multiple liquid inlet flow paths 212 or multiple liquid outlet flow paths 213 are respectively connected to the regulating valves 23, and the working roll 22 has multiple cooling areas corresponding to the multiple flow channel structures 211. There are multiple measuring mechanisms 1, which are arranged along the axial direction of the support roll 21 and are respectively used to measure the thickness of each part of the plate 200 pressed by the multiple cooling areas. The rolling mill 100 also includes a controller, and the multiple measuring mechanisms 1 and the multiple regulating valves 23 are all connected to the controller. The controller is configured to control the opening of the corresponding regulating valves 23 according to the measurement information of the measuring mechanisms 1.

[0081] The flow channel structures 211 of this embodiment are arranged at intervals along the axial direction of the support roller 21 , and may be arranged at equal distances or at unequal distances along the axial direction of the support roller 21 .

[0082] In this embodiment, the multiple liquid inlet flow paths 212 and / or the multiple liquid outlet flow paths 213 are connected one by one with the multiple flow channel structures 211. When there are multiple liquid inlet flow paths 212 and multiple liquid outlet flow paths 213, the multiple liquid inlet flow paths 212, the multiple flow channel structures 211 and the multiple liquid outlet flow paths 213 are equal in number and connected one by one.

[0083] The regulating valve 23 of this embodiment may be a solenoid valve or other valves.

[0084] In this embodiment, the number of the plurality of flow channel structures 211 is equal to the number of the plurality of measuring mechanisms 1 and they correspond one to one.

[0085] During use, when one of the measuring mechanisms 1 measures that the thickness of the plate 200 is relatively thin, the controller controls the corresponding regulating valve 23 to adjust the opening, for example, opening the regulating valve 23 or increasing the opening of the regulating valve 23. In this way, the cooling amount received by the cooling area corresponding to the working roller 22 and the flow channel structure 211 increases, and shrinks, thereby increasing the gap between the corresponding parts of the two working rollers 22, reducing the force on the plate 200, and thus becoming thicker.

[0086] By providing a plurality of flow channel structures 211 and controlling the flow rates of the heat exchange medium of the plurality of flow channel structures 211 respectively, a larger size control in the width direction of the plate 200 can be achieved, further improving the quality of the rolled product. In addition, for the plate 200 with different thickness requirements in different regions in the width direction, the plate 200 can also be rolled out by setting the opening of the regulating valve 23.

[0087] In some embodiments, the flow channel structure 211 includes a first cavity 2111, a first plate 2112 and a second plate 2113, the first plate 2112 and the second plate 2113 both surround the central axis 214 of the support roller, the first plate 2112 and the second plate 2113 are arranged opposite to each other and a second cavity 2114 is formed therebetween, the first cavity 2111 surrounds the central axis 214, the two outer peripheral ends of the first plate 2112 and the second plate 2113 away from the central axis 214 are both located in the first cavity 2111, so that the second cavity 2114 is connected to the first cavity 2111, one of the liquid inlet flow path 212 and the liquid outlet flow path 213 is located at the central axis 214 of the support roller 21 and extends along the central axis 214, and is connected to the second cavity 2114, and has a spacing with the first cavity 2111, and the other of the liquid outlet flow path 213 and the liquid inlet flow path 212 is connected to the first cavity 2111.

[0088] In this embodiment, the first plate 2112 and the second plate 2113 are both arranged around the central axis 214, that is, the first plate 2112 and the second plate 2113 are both arranged in a ring shape. The shapes of the first plate 2112 and the second plate 2113 can be the same or different.

[0089] In this embodiment, both peripheral ends of the first plate 2112 and the second plate 2113 away from the central axis 214 are located in the first cavity 2111, that is, the peripheral ends of the first plate 2112 and the second plate 2113 are located in the first cavity 2111, so that the heat exchange medium flows out from the gap between the first plate 2112 and the second plate 2113 and enters the first cavity 2111. It should be noted that other parts of the first plate 2112 and other parts of the second plate 2113 can also be located in the first cavity 2111, but the first cavity 2111 cannot extend to the inlet flow path 212 or the outlet flow path 213 located at the central axis 214, so that the two are spaced apart and not directly connected.

[0090] The first cavity 2111 of this embodiment is an annular cavity.

[0091] Optionally, the liquid inlet flow path 212 is located at the central axis 214 of the support roller 21 and extends along the central axis 214 , and the liquid outlet flow path 213 is in communication with the first cavity 2111 and is in communication with the regulating valve 23 .

[0092] The flow channel structure 211 is configured to include a first cavity 2111, a first plate 2112 and a second plate 2113. The heat exchange medium flows into the first cavity 2111 through the gap between the first plate 2112 and the second plate 2113. This structure allows the heat exchange medium to flow through the periphery of the first plate 2112 and the second plate 2113. The setting of the first cavity 2111 can allow the heat exchange medium to have a larger flow rate, thereby forming a better cooling effect on the outer surface of the support roller 21.

[0093] In some embodiments, the flow channel structure 211 also includes a third plate body 2115, which surrounds the central axis 214 and connects the two peripheral ends of the first plate body 2112 and the second plate body 2113 that are away from the central axis 214. The third plate body 2115 is provided with a plurality of through holes 2116 for heat exchange medium to pass through. The plurality of through holes 2116 are arranged at intervals along the surrounding direction of the third plate body 2115, and the first cavity 2111 and the second cavity 2114 are connected through the plurality of through holes 2116.

[0094] In this embodiment, the outer peripheral end of the first plate body 2112 away from the central axis 214 and the outer peripheral end of the second plate body 2113 away from the central axis 214 are connected by a third plate body 2115, and the third plate body 2115 is ring-shaped.

[0095] The shapes of the plurality of through holes 2116 in this embodiment may be the same or different. For example, the plurality of through holes 2116 are all circular holes or elliptical holes.

[0096] A third plate 2115 is provided, and the heat exchange medium is passed through the through holes 2116 on the third plate 2115 . In this way, the pressure of the heat exchange medium in the second cavity 2114 can be increased, so that the heat exchange medium can be emitted from each through hole 2116 more evenly, thereby improving the heat exchange effect on the working roll 22 .

[0097] In some embodiments, there is one inlet flow path 212 or one outlet flow path 213 located at the central axis 214, and they are connected to the second cavity 2114 of each flow channel structure 211; there are multiple outlet flow paths 213 and the other of the inlet flow paths 212, and multiple inlet flow paths 212 or multiple outlet flow paths 213 are connected one by one to multiple first cavities 2111, and multiple inlet flow paths 212 or multiple outlet flow paths 213 are respectively connected to regulating valves 23.

[0098] The second cavities 2114 of the flow channel structures 211 of this embodiment are connected via a liquid inlet flow path 212 or a liquid outlet flow path 213 .

[0099] Using one inlet flow path 212 or outlet flow path 213 to connect the second cavity 2114 of each flow channel structure 211 can make the flow path design simpler and easier to manufacture. The other of the outlet flow path 213 and the inlet flow path 212 is provided in multiple numbers, which is convenient for connecting the regulating valves 23 one by one.

[0100] See also Figure 5 In some embodiments, the support roller 21 includes a roller body 215 and a first rotating joint 216 , the roller body 215 is provided with a flow channel structure 211 , and the first rotating joint 216 and the roller body 215 together form a liquid inlet flow path 212 or a liquid outlet flow path 213 located at the central axis 214 .

[0101] Exemplarily, the first rotary joint 216 includes a first part and a second part, the second part and the roller body 215 together form a liquid inlet flow path 212 or a liquid outlet flow path 213, the first part is fixedly connected to the roller body 215 and surrounds the outer circumference of the second part, and the first part and the second part are connected by a bearing.

[0102] The first rotating joint 216 is provided to facilitate the external pipeline to be connected to the flow channel structure 211 of the roller body 215 through the first rotating joint 216 .

[0103] In some embodiments, the support roller 21 includes a roller body 215 and a second rotary joint 217. The roller body 215 includes a working part 2151 and two functional parts 2152. The working part 2151 contacts the working roller 22 and is provided with a flow channel structure 211. The two functional parts 2152 are fixedly arranged at both ends of the working part 2151. The outer peripheral side of at least one functional part 2152 is surrounded by a second rotary joint 217. The second rotary joint 217, the functional part 2152 and the working part 2151 jointly form the other of the liquid outlet flow path 213 and the liquid inlet flow path 212.

[0104] When both functional parts 2152 are provided with a second rotary joint 217, the second rotary joint 217 on one side, the functional part 2152 and the working part 2151 on that side form an inlet flow path 212 or an outlet flow path 213, and the second rotary joint 217 on the other side, the functional part 2152 and the working part 2151 on the other side form another inlet flow path 212 or an outlet flow path 213.

[0105] Optionally, both functional parts 2152 are provided with a second rotary joint 217, and the second rotary joint 217 on one side, the functional part 2152 located on that side and the working part 2151 form at least two liquid inlet flow paths 212 or liquid outlet flow paths 213, and the second rotary joint 217 on the other side, the functional part 2152 on the other side and the working part 2151 form at least two liquid inlet flow paths 212 or liquid outlet flow paths 213.

[0106] The second rotary joint 217 is provided to facilitate the external pipeline to be connected to the flow channel structure 211 of the roller body 215 through the second rotary joint 217 .

[0107] In some embodiments, the flow channel structure 211 is spirally disposed in the support roller 21 around the central axis 214 of the support roller.

[0108] In this embodiment, the liquid inlet flow paths 212 and the liquid outlet flow paths 213 connected to the flow channel structure 211 may correspond to each other one by one, or one liquid inlet flow path 212 or one liquid outlet flow path 213 may connect to multiple flow channel structures 211 .

[0109] The flow channel structure 211 is configured in a spiral form, so as to simplify the flow channel structure 211 and reduce the volume of the heat exchange medium.

[0110] In some embodiments, each measuring mechanism 1 includes at least one pair of distance measuring sensors 11 , the two paired distance measuring sensors 11 are arranged along the first direction X and form a gap therebetween for the plate 200 to pass through, and the two paired sensors are respectively used to measure the gap between each other and the plate 200 .

[0111] The distance measuring sensor 11 of this embodiment may be a laser distance measuring sensor, an infrared distance measuring sensor, or other sensors capable of measuring distance.

[0112] The two paired distance measuring sensors 11 measure the distance between themselves and the plate 200 respectively, and the distance between the two distance measuring sensors 11 is known. After the distance between the two distance measuring sensors 11 and the plate 200 is subtracted, the remaining value is the thickness of the plate 200 .

[0113] The thickness of the plate 200 is measured by two paired distance measuring sensors 11 , and the measurement result is more accurate.

[0114] In some embodiments, the rolling mill 100 includes a refrigeration mechanism, which is connected to the liquid inlet flow path 212 and the liquid outlet flow path 213 and is used to exchange heat with the heat exchange medium.

[0115] The refrigeration mechanism of this embodiment can be a cooling tower, which dissipates the heat of the heat exchange medium into the air through natural or mechanical ventilation. The refrigeration mechanism can also be a refrigerant refrigeration device, which includes structures such as a compressor, a condenser, an expansion valve and an evaporator. The compressor compresses the gaseous refrigerant into a high-temperature and high-pressure gas and promotes its flow. The condenser cools the high-pressure gas and condenses it into a liquid refrigerant. The expansion valve reduces the pressure of the refrigerant, causing it to expand rapidly and cool down, and enter the evaporator. The refrigerant absorbs the heat of the surrounding heat exchange medium in the evaporator, evaporates into a gaseous state, and achieves cooling of the heat exchange medium.

[0116] Setting a refrigeration mechanism to exchange heat with the heat exchange medium is more convenient to use.

[0117] In some embodiments, the diameter of the support roll 21 is greater than the diameter of the working roll 22 .

[0118] With such arrangement, the supporting roller 21 has a larger volume, which is not only convenient for arranging the flow channel structure 211 , but also can accommodate more heat exchange medium, thereby improving the cooling effect of the supporting roller 21 .

[0119] An embodiment of the present application also provides a battery production system, including the above-mentioned rolling mill 100.

[0120] Exemplarily, the battery production system further includes a pole piece coating device, which is located downstream of the rolling mill 100 and is used to coat the active material on at least one side of the plate 200 .

[0121] Exemplarily, the battery production system further includes a drying device, which is located downstream of the electrode coating device, and is used to dry the plate 200 coated with the active material to form a dried electrode.

[0122] See also Figure 1-Figure 5The embodiment of the present application provides a rolling mill 100, which includes a rolling mill mechanism 2 and a measuring mechanism 1. The rolling mill mechanism 2 includes two support rollers 21 and two working rollers 22. The two support rollers 21 are arranged at intervals along a first direction X. Along the first direction X, the two working rollers 22 are arranged between the two support rollers 21, and the two working rollers 22 are arranged side by side along the first direction X. A gap for a plate 200 to pass through is formed between the two working rollers 22, and the two support rollers 21 are respectively used to press the adjacent working rollers 22. At least one of the two support rollers 21 is provided with a flow channel structure 211 for the flow of a heat exchange medium, and a liquid inlet flow path 212 and a liquid outlet flow path 213 respectively connected to the flow channel structure 211. The flow channel structure 211 is located inside the support roller 21, and the area corresponding to the working roller 22 and the flow channel structure 211 is a cold area. The measuring mechanism 1 is used to measure the thickness of the plate 200 pressed by the cold area. There are multiple flow channel structures 211, which are arranged at intervals along the axial direction of the support roll 21. There are multiple liquid inlet flow paths 212 or liquid outlet flow paths 213, which are connected to the multiple flow channel structures 211 one by one. The multiple liquid inlet flow paths 212 or multiple liquid outlet flow paths 213 are respectively connected to the regulating valves 23. The working roll 22 has multiple cooling areas corresponding to the multiple flow channel structures 211. There are multiple measuring mechanisms 1, which are arranged along the axial direction of the support roll 21 and are respectively used to measure the thickness of each part of the plate 200 pressed by the multiple cooling areas. The rolling mill 100 also includes a controller, and the multiple measuring mechanisms 1 and the multiple regulating valves 23 are all connected to the controller. The controller is configured to control the opening of the corresponding regulating valves 23 according to the measurement information of the measuring mechanisms 1. The flow channel structure 211 includes a first cavity 2111, a first plate 2112 and a second plate 2113. The first plate 2112 and the second plate 2113 both surround the central axis 214 of the support roller. The first plate 2112 and the second plate 2113 are arranged opposite to each other and a second cavity 2114 is formed therebetween. The first cavity 2111 surrounds the central axis 214. The two outer peripheral ends of the first plate 2112 and the second plate 2113 that are away from the central axis 214 are both located in the first cavity 2111, so that the second cavity 2114 is connected to the first cavity 2111. One of the liquid inlet flow path 212 and the liquid outlet flow path 213 is located at the central axis 214 of the support roller 21 and extends along the central axis 214, and is connected to the second cavity 2114 and has a spacing with the first cavity 2111. The other of the liquid outlet flow path 213 and the liquid inlet flow path 212 is connected to the first cavity 2111.The flow channel structure 211 also includes a third plate body 2115, which surrounds the central axis 214 and connects the two peripheral ends of the first plate body 2112 and the second plate body 2113 that are away from the central axis 214. The third plate body 2115 is provided with a plurality of through holes 2116 for heat exchange medium to pass through. The plurality of through holes 2116 are arranged at intervals along the surrounding direction of the third plate body 2115, and the first cavity 2111 and the second cavity 2114 are connected through the plurality of through holes 2116. There is one inlet flow path 212 or one outlet flow path 213 located at the central axis 214, and they are connected to the second cavity 2114 of each flow channel structure 211; there are multiple outlet flow paths 213 and the other of the inlet flow paths 212, and the multiple inlet flow paths 212 or multiple outlet flow paths 213 are connected to the multiple first cavities 2111 one by one, and the multiple inlet flow paths 212 or multiple outlet flow paths 213 are respectively connected to the regulating valve 23. The diameter of the support roll 21 is greater than the diameter of the working roll 22.

[0123] 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.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A rolling mill, characterized in that: include: A rolling mechanism, wherein the rolling mechanism comprises two supporting rollers and two working rollers, the two supporting rollers are arranged at intervals along a first direction, the two working rollers are arranged between the two supporting rollers along the first direction, and the two working rollers are arranged side by side along the first direction, a gap is formed between the two working rollers for the plate to pass through, the two supporting rollers are respectively used to press the working rollers adjacent thereto, at least one of the two supporting rollers is provided with a flow channel structure for the flow of heat exchange medium and a liquid inlet flow path and a liquid outlet flow path respectively connected to the flow channel structure, the flow channel structure is located inside the supporting roller, and the area corresponding to the working roller and the flow channel structure is a cooling area; The measuring mechanism is used to measure the thickness of the plate pressed by the cooling area.

2. The rolling mill according to claim 1, characterized in that The supporting roller has a central axis, and the flow channel structure surrounds at least a portion of the outer circumference of the central axis.

3. The rolling mill according to claim 1, characterized in that There are multiple flow channel structures, which are arranged at intervals along the axial direction of the support roller. There are multiple liquid inlet flow paths and / or multiple liquid outlet flow paths, which are connected to the multiple flow channel structures one by one. The multiple liquid inlet flow paths or the multiple liquid outlet flow paths are respectively connected to regulating valves. The working roller has multiple cooling areas corresponding to the multiple flow channel structures. There are multiple measuring mechanisms, which are arranged along the axial direction of the supporting roller and are respectively used to measure the thickness of each portion of the plate pressed by the multiple cooling areas; The rolling mill further comprises a controller, and the plurality of measuring mechanisms and the plurality of regulating valves are all connected to the controller, and the controller is configured to control the opening of the corresponding regulating valve according to the measurement information of the measuring mechanisms.

4. The rolling mill according to claim 3, characterized in that The flow channel structure includes a first cavity, a first plate and a second plate, the first plate and the second plate both surround the central axis of the support roller, the first plate and the second plate are arranged opposite to each other and form a second cavity therebetween, the first cavity surrounds the central axis, and both outer peripheral ends of the first plate and the second plate away from the central axis are located in the first cavity, so that the second cavity is connected to the first cavity; One of the liquid inlet flow path and the liquid outlet flow path is located on the central axis of the support roller and extends along the central axis, is connected to the second cavity, and has a distance from the first cavity, and the other of the liquid outlet flow path and the liquid inlet flow path is connected to the first cavity.

5. The rolling mill according to claim 4, characterized in that The flow channel structure also includes a third plate body, which surrounds the central axis and connects the two outer peripheral ends of the first plate body and the second plate body that are away from the central axis. The third plate body is provided with a plurality of through holes for the heat exchange medium to pass through, and the plurality of through holes are arranged at intervals along the surrounding direction of the third plate body, and the first cavity and the second cavity are connected through the plurality of through holes.

6. The rolling mill according to claim 4, characterized in that The number of the liquid inlet flow path or the liquid outlet flow path located at the central axis is one, and the second cavity of each flow channel structure is connected; The number of the other of the liquid outlet flow path and the liquid inlet flow path is multiple, the multiple liquid inlet flow paths or the multiple liquid outlet flow paths are connected one by one with the multiple first cavities, and the multiple liquid inlet flow paths or the multiple liquid outlet flow paths are respectively connected with the regulating valve.

7. The rolling mill according to claim 6, characterized in that The supporting roller includes a roller body and a first rotating joint, the roller body is provided with a flow channel structure, the first rotating joint is arranged at one end of the roller body, and the first rotating joint and the roller body together form the liquid inlet flow path or the liquid outlet flow path located at the central axis.

8. The rolling mill according to claim 6, characterized in that The supporting roller comprises a roller body and a second rotating joint, The roller body includes a working part and two functional parts, the working part is in contact with the working roller and is provided with the flow channel structure, the two functional parts are fixedly arranged at both ends of the working part, the outer peripheral side of at least one of the functional parts is surrounded by the second rotary joint, and the second rotary joint, the functional part and the working part jointly form the other of the liquid outlet flow path and the liquid inlet flow path.

9. The rolling mill according to claim 3, characterized in that The flow channel structure is spirally arranged in the support roller around the central axis of the support roller.

10. The rolling mill according to any one of claims 1 to 9, characterized in that: Each of the measuring mechanisms comprises at least one pair of distance measuring sensors, wherein the two paired distance measuring sensors are arranged along the first direction and form a distance therebetween for the plate to pass through, and the two paired sensors are respectively used to measure the distance between themselves and the plate.

11. The rolling mill according to any one of claims 1 to 9, characterized in that: The rolling mill includes a refrigeration mechanism, which is communicated with the liquid inlet flow path and the liquid outlet flow path and is used for exchanging heat with the heat exchange medium.

12. The rolling mill according to any one of claims 1 to 9, characterized in that: The diameter of the support roll is larger than the diameter of the working roll.

13. A battery production system, characterized in that: Comprising a rolling mill as described in any one of claims 1-12.

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