Roller and pole piece roller press

Abstract

The utility model relates to a roller and a pole piece roller press. A heat exchange flow channel and a circulating flow channel are arranged in the roller, the heat exchange flow channel is used for circulating a heat exchange medium, and the circulating flow channel is communicated with the heat exchange flow channel and used for leading the heat exchange medium into the heat exchange flow channel and / or leading the heat exchange medium out of the heat exchange flow channel. Wherein the heat exchange flow channel is arranged at the axial end part of the roller, and is arranged in the roller along the circumferential direction of the roller. According to the roller provided by the utility model, the diameter reduction amount of the roller at the end part and the deformation amount of the middle section of the roller can be kept balanced, so that the thickness of a rolled pole piece can be uniform and consistent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy, in particular to a roller and a pole piece roller press. BACKGROUND

[0002] The pole piece roller press is a professional equipment for roller pressing treatment of battery pole pieces. Through synchronous rotation of two rollers, the pole piece roller press applies pressure to the battery pole pieces sent in under the action of a motor drive and a hydraulic system, so that the pole pieces change from a fluffy state to a dense state and improve the compaction density.

[0003] In the related art, a large amount of heat is generated between the roller and the pole piece during the pole piece calendering process. Since the heat dissipation conditions of the two ends of the roller are relatively good, the temperature is low, and the middle part is difficult to dissipate heat, the temperature is high. Under the action of thermal expansion and cold contraction, the expansion amount of the middle part of the roller is greater than that of the two ends, so that the phenomenon of low middle and high two ends occurs, resulting in the pole piece calendered out to be thick in the middle and thin on both sides.

[0004] Therefore, the roller in the related art is prone to the phenomenon of low middle and high two ends, resulting in poor thickness consistency of the pole piece calendered out. Invention content

[0005] To solve or partially solve the problems in the related art, the present application provides a pole piece roller press. The diameter reduction amount of the end part of the roller and the deformation amount of the middle part of the roller can be balanced, so that the thickness of the pole piece calendered out can be uniform.

[0006] The first aspect of the present application provides a roller, which is internally provided with a heat exchange flow channel and a circulation flow channel. The heat exchange flow channel is used for circulating a heat exchange medium. The circulation flow channel is in communication with the heat exchange flow channel and is used for introducing and / or discharging the heat exchange medium in the heat exchange flow channel.

[0007] The heat exchange flow channel is arranged at the axial end part of the roller and is arranged along the circumference of the roller in the roller.

[0008] In an implementation manner, the heat exchange flow channel includes a plurality of heat exchange sub-flow channels arranged along the circumference of the roller at intervals.

[0009] The circulation flow channel includes a plurality of liquid inlet sub-flow channels and liquid outlet sub-flow channels. The plurality of liquid inlet sub-flow channels and liquid outlet sub-flow channels are arranged at intervals along the circumference of the roller and are connected in one-to-one correspondence with the plurality of heat exchange sub-flow channels. Each liquid inlet sub-flow channel is connected with the liquid inlet end of the corresponding heat exchange sub-flow channel. Each liquid outlet sub-flow channel is connected with the liquid outlet end of the corresponding heat exchange sub-flow channel.

[0010] In one implementation, the shaft center region of the roller is provided with a liquid inlet channel, and a plurality of liquid inlet sub-flow channels are connected to the liquid inlet channel at one end close to the shaft center region.

[0011] In one implementation, the roller has a first end and a second end at two axial ends thereof, and the first end and the second end are respectively provided with the heat exchange flow channel, and the liquid outlet end of the heat exchange flow channel of the first end is connected to the liquid inlet end of the heat exchange flow channel of the second end.

[0012] In one implementation, the circulation flow channel further comprises a transition flow channel connected between the liquid outlet sub-flow channel of the first end and the liquid inlet sub-flow channel of the second end.

[0013] The transition flow channel is arranged at the shaft center region of the roller and between the first end and the second end of the roller.

[0014] In one implementation, the liquid inlet sub-flow channel of the first end is arranged in a direction perpendicular to the shaft center of the roller, and the liquid outlet sub-flow channel of the first end is arranged in a direction inclined to the shaft center of the roller; and / or,

[0015] The liquid inlet sub-flow channel of the second end is arranged in a direction inclined to the shaft center of the roller, and the liquid outlet sub-flow channel of the second end is arranged in a direction perpendicular to the shaft center of the roller.

[0016] In one implementation, the liquid inlet sub-flow channel and the liquid outlet sub-flow channel are straight flow channels; and / or,

[0017] The heat exchange sub-flow channel is a non-straight flow channel.

[0018] In one implementation, the total length of the paths of the plurality of heat exchange sub-flow channels is greater than the circumference of the roller surface of the roller end.

[0019] In one implementation, a liquid inlet channel and a liquid outlet channel are arranged along the shaft center direction of the roller.

[0020] The roller, the liquid inlet channel and the liquid outlet channel are coaxially arranged, and the liquid outlet channel is arranged at the periphery of the liquid inlet channel.

[0021] The second aspect of the application provides an electrode sheet roller press comprising the roller as described in the first aspect.

[0022] The technical solution provided by the application can have the following beneficial effects:

[0023] The roller provided in the application is internally provided with a heat exchange flow channel and a circulating flow channel. The heat exchange flow channel is used for circulating heat exchange medium. The circulating flow channel is communicated with the heat exchange flow channel and is used for introducing and / or discharging the heat exchange medium in the heat exchange flow channel. The heat exchange flow channel is arranged at the axial end of the roller and is arranged along the circumference of the roller. When the heat exchange medium circulates in the heat exchange flow channel, heat exchange is generated between the roller surface and the heat exchange medium, so that the temperature of the roller surface in the area where the roller end is located is reduced, and then the diameter of the roller surface at the roller end is reduced in the low-temperature environment. The diameter reduction amount and the deformation amount of the middle segment of the roller can be balanced, and then the thickness of the rolled pole piece can be uniform.

[0024] Further, the roller provided in the application, the heat exchange flow channel comprises a plurality of heat exchange sub-flow channels arranged along the circumference of the roller. The circulating flow channel comprises a plurality of liquid inlet sub-flow channels and a plurality of liquid outlet sub-flow channels. The plurality of liquid inlet sub-flow channels and the plurality of liquid outlet sub-flow channels are arranged along the circumference of the roller and are connected with the plurality of heat exchange sub-flow channels one by one. Each liquid inlet sub-flow channel is connected with the liquid inlet end of the corresponding heat exchange sub-flow channel. Each liquid outlet sub-flow channel is connected with the liquid outlet end of the corresponding heat exchange sub-flow channel. The heat exchange medium can be uniformly introduced into and discharged from the plurality of heat exchange sub-flow channels, so as to avoid the temperature difference of the roller end caused by the uneven distribution of the heat exchange medium in the circumferential direction of the roller. The temperature of the roller end can be uniform, and then the deformation amount of the roller end in the circumferential direction is uniform, and the uniformity of the thickness of the rolled pole piece can be further improved.

[0025] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the application. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference characters refer to like parts throughout the several views, and in which exemplary embodiments of the present application are shown.

[0027] Figure 1 is a schematic view of the internal structure of the roller of an embodiment of the present application;

[0028] Figure 2 is Figure 1 is a sectional view along A-A in

[0029] Figure 3 is a schematic view of the structure of the circulating flow channel of the roller of an embodiment of the present application;

[0030] Figure 4 is Figure 3 is a sectional view along B-B in

[0031] Figure 5 is a schematic view of a liquid outlet channel of a roll according to an embodiment of the present application.

[0032] Reference signs:

[0033] 100, roll; 110, roll body; 101, heat exchange flow channel; 102, circulation flow channel; 103, roll surface; 104, liquid inlet port; 111, liquid inlet channel; 1111, liquid collection area; 112, first-end liquid inlet sub-flow channel; 113, first-end heat exchange sub-flow channel; 114, first-end liquid outlet sub-flow channel; 115, transition flow channel; 116, second-end liquid inlet sub-flow channel; 117, second-end heat exchange sub-flow channel; 118, second-end liquid outlet sub-flow channel; 119, liquid outlet channel; 120, roll neck; 130, end cover; 131, baffle; 132, sealing ring; 140, liquid stopper. DETAILED DESCRIPTION

[0034] Preferred embodiments of the present application will be described herein below with reference to the accompanying drawings. While the preferred embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0035] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0036] It should be understood that although the terms "first", "second", "third" etc. can be employed in this application to describe various information, such information should not be limited by these terms. These terms are only used to distinguish one piece of information from another. For example, a first information can also be termed a second information, and, similarly, a second information can also be termed a first information, without departing from the scope of the present application. Therefore, features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0037] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] Due to thermal expansion and contraction, the expansion of the middle part of the roll is greater than that of the two ends, resulting in a phenomenon where the middle is lower and the two ends are higher. This leads to the rolled electrode sheet being thicker in the middle and thinner at both ends, resulting in poor thickness uniformity.

[0040] To address the aforementioned problems, this application provides a rolling mill roll whose diameter reduction at the ends is balanced with the deformation of the middle section, thereby ensuring uniform thickness of the rolled electrode sheets.

[0041] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0042] Figure 1 This is a schematic diagram of the structure of a roll according to an embodiment of this application; Figure 2 yes Figure 1 Cross-sectional view at point AA along the middle.

[0043] See Figure 1 and Figure 2 This application provides a roll 100, which has a heat exchange channel 101 and a circulation channel 102. Figure 2 (As shown), the heat exchange channel 101 is used to circulate the heat exchange medium, and the circulation channel 102 is connected to the heat exchange channel 101 for introducing the heat exchange medium into the heat exchange channel 101 and / or exporting the heat exchange medium in the heat exchange channel 101; wherein, the heat exchange channel 101 is provided at the axial end of the roll 100 and is arranged circumferentially within the roll 100.

[0044] The roll 100 includes a roll body 110 and roll necks 120 located at both axial ends of the roll body 110. The diameter of the roll body 110 is larger than the diameter of the roll necks 120. The outer circumferential surface of the roll body 110 is a roll surface 103, which is used to contact the rolled electrode sheet to deform the electrode sheet. The axial ends of the roll include a first end a and a second end b located at both axial ends of the roll body. The roll necks 120, which connect to the first end a and the second end b, support the roll body 110 and enable it to rotate stably around its axis.

[0045] In this application, the temperature of the heat exchange medium introduced into the heat exchange channel 101 is lower than a set value, for example, lower than the temperature of the roller surface 103 at the first end a and / or the second end b. The heat exchange medium can be a liquid medium, such as oil, solution or water. In other embodiments, it can also be a gaseous medium or a gas-liquid mixture.

[0046] When the heat exchange medium flows in the heat exchange channel 101, heat exchange occurs between the roller surface 103 and the heat exchange medium, causing the temperature of the roller surface 103 in the area where the first end a and / or the second end b are located to decrease. As a result, the diameter of the roller surface 103 in the area where the first end a and / or the second end b are located shrinks in the low temperature environment. The amount of diameter shrinkage at the first end a and the second end b is balanced with the deformation of the middle section of the roller body 110, thereby controlling the curvature of the roller body 110 at the first end a and the second end b to be the same as the curvature of the middle section of the roller body 110, thus making the thickness of the rolled electrode uniform.

[0047] In this application, the roll 100 is symmetrical about the horizontal center axis and about the vertical center line. The roll 100 has the same structure at the first end a and the second end b, and the structure and path of the heat exchange channel 101 at the first end a and the second end b are also the same.

[0048] This embodiment takes the first end a as an example to introduce the specific structure of the heat exchange channel and the circulation channel. Specifically, the heat exchange channel 101 includes a plurality of first end heat exchange sub-channels 113 arranged at intervals along the circumference of the roll. The first end heat exchange sub-channels 113 are provided with liquid inlet end and liquid outlet end. The circulation channel 102 includes a plurality of liquid inlet sub-channels 112 ( Figure 2 (shown) and liquid outlet channel 114 ( Figure 2 As shown, multiple liquid inlet sub-channels 112 and liquid outlet sub-channels 114 are arranged at intervals along the circumference of the roll and correspond one-to-one with multiple heat exchange sub-channels 113. Each liquid inlet sub-channel 112 is connected to the liquid inlet end of the corresponding heat exchange sub-channel 113 and is used to output the heat exchange medium from each heat exchange sub-channel 113. Each liquid outlet sub-channel 114 is connected to the liquid outlet end of the corresponding heat exchange sub-channel 113 and is used to output the heat exchange medium flowing in each heat exchange sub-channel 113.

[0049] In this embodiment, the inlet sub-channel 112 and the outlet sub-channel can be holes opened in a predetermined direction inside the roller body 110.

[0050] See also Figure 2 Multiple heat exchange sub-channels 113 are arranged in a ring around the axis of the roll 100 and are spaced apart, for example, they can be arranged at equal intervals. With this arrangement, the heat exchange medium can flow more evenly in the multiple heat exchange sub-channels 113, avoiding temperature differences in different areas of the circumferential direction of the roll 100 due to uneven distribution of the heat exchange medium in the circumferential direction of the roll 100, and making the temperature of the area where the first end a and the second end b are located uniform in the circumferential direction.

[0051] See Figure 1 and Figure 2 In some embodiments, the heat exchange sub-channels 113 are non-linear channels, such as arc-shaped or curved channels, wherein at least a portion of the heat exchange sub-channels 113 extends circumferentially along the roll surface 103. The total path length of the plurality of heat exchange sub-channels 113 is greater than the circumference of the roll surface 103, so that the heat exchange medium stays in the region where the first end a and the second end b are located for a longer time, and therefore the region where the first end a and the second end b are located can be cooled more fully, making it the same as the curvature of the middle section of the roll 100.

[0052] It is worth noting that, depending on the actual situation, the heat exchange channel 101 of this application can be provided at one end or both ends of the roller body 110, for example, at the first end a or the second end b of the roller body 110, or at both the first end a and the second end b.

[0053] See Figure 3 and Figure 4 In some embodiments, when the heat exchange channel 101 is provided at both ends of the roller body in the axial direction, the first end a and the second end b are respectively provided with heat exchange channels 101. For example, the first end a is provided with multiple heat exchange sub-first channels 113, and the second end b is provided with multiple second end heat exchange sub-channels 117. The liquid outlet end of the heat exchange sub-channel 113 at the first end is connected to the liquid inlet end of the heat exchange sub-channel 117 at the second end.

[0054] See Figure 4 and Figure 5 A liquid outlet channel 119 is provided in the axial region of the roll 100, and the liquid outlet end of the heat exchange sub-channel 117 at the second end b is connected to the liquid outlet channel 119. With this arrangement, the heat exchange medium can flow from the heat exchange sub-channel 113 at the first end a to the heat exchange sub-channel 117 at the second end b.

[0055] The circulation channel also includes a transition channel 115, which connects the liquid outlet sub-channel 114 at the first end a and the liquid inlet sub-channel 116 at the second end b. Specifically, the multiple liquid outlet sub-channels 114, which are connected one-to-one with the multiple heat exchange sub-channels 113 at the first end a, are connected to the transition channel 115, and the multiple liquid inlet sub-channels 116, which are connected one-to-one with the multiple heat exchange sub-channels 117 at the second end b, are connected to the transition channel 115. The transition channel 115 is used to connect the heat exchange channels at the first end a and the second end b in series, thereby guiding the heat exchange medium of the heat exchange sub-channel 113 at the first end a to the heat exchange sub-channel 117 at the second end b.

[0056] In some embodiments, the transition channel 115 may be located in the axial region of the roll, between the first end a and the second end b, but it is not limited thereto and may also be located in a non-axial region.

[0057] The following describes the flow process of the heat exchange medium in the roll of this application from the first end a to the second end b. Please refer to [the relevant documentation / reference]. Figures 1-5 , Figures 1-5 The dashed arrows indicate the flow direction of the heat exchange medium. The heat exchange medium is introduced into the collection area 1111 from the inlet channel 111. The heat exchange medium in the collection area 1111 is transported through the inlet sub-channel 112 of the first end a to multiple heat exchange sub-channels 113 of the first end a. The heat exchange medium flowing through the heat exchange sub-channels 113 of the first end a flows into the outlet sub-channel 114 of the first end a. Then, the heat exchange medium in the outlet sub-channel 114 of the first end a flows into the transition channel 115. The heat exchange medium in the transition channel 115 then flows into the inlet sub-channel 114 of the second end b. 16. The heat exchange medium is transported through the second end liquid inlet channel 116 to multiple heat exchange sub-channels 117 at the second end b. The heat exchange medium flows through the heat exchange sub-channels 117 at the second end b to the liquid outlet channel 118 at the second end b. The heat exchange medium in the liquid outlet channel 118 at the second end b then flows to the liquid outlet channel 119. The heat exchange medium finally flows out of the roll 100 through the liquid outlet channel 119. In some embodiments, the heat exchange medium can be cooled outside the roll and then reintroduced into the roll through the liquid inlet channel, thus realizing the reciprocating circulation of the heat exchange medium inside and outside the roll 100.

[0058] In some embodiments, the inlet and outlet sub-channels of the first end a and the second end b have specific path shapes and exhibit different extension angles relative to the roll 100. For example, the inlet sub-channel 112 of the first end a is arranged in a direction perpendicular to the roll axis, and the outlet sub-channel 114 of the first end a is arranged in a direction inclined to the roll axis. Since the roll of this application is left-right symmetrical, the inlet sub-channel 116 of the second end b is arranged in a direction inclined to the roll axis, and the outlet sub-channel 118 of the second end b is arranged in a direction perpendicular to the roll axis.

[0059] This configuration shortens the path of the inlet sub-channel 112 at the first end a, allowing the heat exchange medium in the inlet channel 111 to be transported more quickly to the heat exchange sub-channel 113 at the first end a. Similarly, it shortens the path of the outlet sub-channel 118 at the second end b, allowing the heat exchange medium in the heat exchange sub-channel 117 at the second end b to be quickly discharged from the roll 100. Furthermore, by setting the outlet sub-channel 114 at the first end a and the inlet sub-channel 116 at the second end b to be inclined, the heat exchange sub-channels 113 at the first end a and 117 at the second end b can be connected via the transition channel 115 in the middle section of the roll 100. This results in a greater distance between the heat exchange medium and the roll surface in the middle section of the roll, thus avoiding any impact on the temperature of the middle section. Simultaneously, it reduces the flow path of the heat exchange medium from the first end a to the second end b, thereby reducing the temperature difference during the flow from the first end a to the second end b, and ensuring consistent curvature changes at the first end a and the second end b of the roll.

[0060] In some embodiments, an inlet channel 111 and an outlet channel 119 are provided along the axial direction of the roll. The inlet channel 111, the outlet channel 119 and the roll 100 are coaxially arranged, that is, their axes coincide. The outlet channel 119 is located around the inlet channel 111. Specifically, the inlet channel 111 can be a tubular component arranged along the axis of the roll 100 and fixed relative to the roll 100, such as an inlet pipe. The inlet channel 111 extends axially from the second end b of the roll 100 to the first end a. The inlet channel 111 is connected to an inlet port 104. The inlet port 104 is located at the end of one of the roll necks 120 away from the roll body 110. The inlet port 104 is used to introduce a heat exchange medium into the inlet channel 111.

[0061] The liquid inlet channel 111 is closed at the end of the first end a to form a liquid collection area 1111. Multiple liquid inlet sub-channels 112 distributed circumferentially at the first end a are connected to the liquid collection area 1111. The heat exchange medium of the liquid collection area 1111 can flow synchronously to the multiple liquid inlet sub-channels 130, so that the heat exchange medium can reach each area of ​​the first end of the roller body circumferentially at the same time.

[0062] In some embodiments, a hollow channel is formed in the axial region of the roll 100, and a tubular component forming the liquid inlet channel 111 is fixed in the hollow channel and coaxial with the hollow channel. There is an annular gap region with a set distance between the outer wall of the tubular component and the inner wall of the hollow channel in the radial direction. This annular gap region is the liquid outlet channel 119.

[0063] The transition channel 115 is located in part of the annular interval area. Two spaced liquid stoppers 140 are installed in the annular interval area near the middle section of the roll. The area between the two liquid stoppers 140 forms the transition channel. The liquid stoppers 140 divide the axial area of ​​the roll body 110 into three independent spaces. The space near the first end a is the liquid inlet space, the space near the second end b is the liquid outlet space, and the transition channel is between the liquid inlet space and the liquid outlet space.

[0064] In some embodiments, the liquid stopper 140 may be an annular component sleeved around the tubular component in the axial region. The annular component is in sealing contact with the outer wall of the tubular component and the inner wall of the hollow channel in the radial direction, thereby ensuring that the transition channel 115 is isolated from the liquid outlet channel 119 and the liquid inlet channel 111, and preventing the heat exchange medium in the liquid outlet channel 119 and the liquid inlet channel 111 from flowing back to the transition channel 115.

[0065] In some embodiments, end caps 130 are installed on the axial side of the roller body at the first end a and the second end b. Heat exchange channels 101 are disposed within the end caps 130. Specifically, a heat exchange sub-channel 113 at the first end a is disposed within the end cap 130 at the first end a, and a heat exchange sub-channel 117 at the second end b is disposed within the end cap 130 at the second end b. After the end caps 130 are closed onto the roller body 110, the inlet and outlet ends of the heat exchange channels 101 in the end caps 130 can be aligned with the inlet and outlet sub-channels inside the roller body 110.

[0066] The end cap 130 is provided with a sealing baffle 131 on the outer side away from the middle section of the roller body 110 in the axial direction. The sealing baffle 131 is used to fasten the end cap 130 to the roller body 110. A sealing ring 132 is provided between the end cap 130 and the roller body 110. This makes the connection between the heat exchange channel 101 and the circulation channel 102 more airtight and prevents the heat exchange medium from leaking out from the connection between the end cap and the roller body.

[0067] This application also provides an electrode roll press, which includes rolls as described in any of the above embodiments.

[0068] The electrode roll press provided in this application has heat exchange channels and circulation channels provided in the rolls as described in the above embodiment. When the heat exchange medium flows in the heat exchange channels, the temperature of the roll surface near the end area of ​​the roll decreases due to the heat exchange between the roll surface and the heat exchange medium. As a result, the diameter of the roll surface in the end area shrinks in a low-temperature environment. By controlling the amount of heat exchange, the amount of diameter reduction of the roll surface in the end area is balanced with the deformation of the roll in the middle, thereby making the thickness of the electrode sheet processed by the roll press uniform.

[0069] In some embodiments, the electrode rolling mill of this embodiment may include two opposing, synchronously rotating rollers, one of which may be a fixed roller and the other a movable roller. A motor drives the fixed roller, and the movable roller follows the fixed roller, rotating synchronously in the opposite direction. The gap between the two rollers can be adjusted according to the required process requirements. Then, the coated and dried electrode sheet is fed into the roller. Under the pressure and pressure of the gap between the two rollers, the compaction density of the electrode sheet can be increased, thereby reducing the internal resistance of the electrode sheet, reducing polarization loss, and thus extending the cycle life of the battery using this electrode sheet.

[0070] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A rolling mill roll, characterized in that: The roll is provided with a heat exchange channel and a circulation channel. The heat exchange channel is used to circulate the heat exchange medium. The circulation channel is connected to the heat exchange channel and is used to introduce the heat exchange medium into the heat exchange channel and / or export the heat exchange medium in the heat exchange channel. The heat exchange channel is located at the axial end of the roll and is arranged circumferentially within the roll.

2. The roll according to claim 1, characterized in that, The heat exchange channel includes a plurality of heat exchange sub-channels arranged at intervals along the circumference of the roll; The circulation channel includes multiple liquid inlet sub-channels and liquid outlet sub-channels. The multiple liquid inlet sub-channels and liquid outlet sub-channels are arranged at intervals along the circumference of the roll and are connected to the multiple heat exchange sub-channels one by one. Each liquid inlet sub-channel is connected to the liquid inlet end of the corresponding heat exchange sub-channel, and each liquid outlet sub-channel is connected to the liquid outlet end of the corresponding heat exchange sub-channel.

3. The roll according to claim 2, characterized in that, The roller has a liquid inlet channel in its axial region, and the ends of the multiple liquid inlet sub-channels near the axial region are connected to the liquid inlet channel.

4. The roll according to claim 2, characterized in that, The axial ends of the roll are a first end and a second end, respectively. The first end and the second end are respectively provided with the heat exchange channel. The liquid outlet of the heat exchange channel at the first end is connected to the liquid inlet of the heat exchange channel at the second end.

5. The roll according to claim 4, characterized in that, The circulation channel further includes a transition channel, which connects the liquid outlet sub-channel at the first end and the liquid inlet sub-channel at the second end. The transition channel is located in the axial region of the roll and between the first and second ends of the roll.

6. The roll according to claim 2, characterized in that, The liquid inlet sub-channel at the first end is arranged in a direction perpendicular to the axis of the roll, and the liquid outlet sub-channel at the first end is arranged in a direction inclined to the axis of the roll; and / or, The liquid inlet channel at the second end is arranged in a direction inclined to the center of the roll axis, and the liquid outlet channel at the second end is arranged in a direction perpendicular to the center of the roll axis.

7. The roll according to claim 2, characterized in that, The inlet sub-channel and the outlet sub-channel are straight channels; and / or, The heat exchange sub-channel is a non-linear channel.

8. The roll according to claim 2, characterized in that, The total path length of the plurality of heat exchange sub-channels is greater than the roll surface circumference at the end of the roll.

9. The roll according to any one of claims 1-8, characterized in that, The roller is provided with an inlet channel and an outlet channel along its axial direction; The roller, the inlet channel, and the outlet channel are coaxially arranged, with the outlet channel located around the inlet channel.

10. A roller press, characterized in that, Includes the rolls as described in any one of claims 1-9.

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