Casting nozzle, casting and rolling machine, current collector, battery monomer and battery

Abstract

The utility model provides a casting nozzle, a casting and rolling machine, a current collector, a battery monomer and a battery, and belongs to the technical field of batteries. The casting nozzle comprises a casting nozzle body, the casting nozzle body comprises a first material conveying cavity and at least one second material conveying cavity which are independent and adjacent to each other, and the feeding sides of the first material conveying cavity and the second material conveying cavity communicate with a first feeding port and a second feeding port of the casting nozzle correspondingly; the casting nozzle body further comprises a confluence cavity communicated with a discharging port of the casting nozzle, the confluence cavity is located on the discharging side of the first material conveying cavity and the discharging side of the second material conveying cavity, and the confluence cavity is communicated with the first material conveying cavity and the second material conveying cavity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a casting nozzle, a casting mill, a current collector, a battery monomer and a battery. BACKGROUND

[0002] Currently, the current collector of the battery is prepared by casting. In the casting process, the metal liquid for forming the current collector needs to be input into the casting nozzle and then injected into the roll gap of the casting roller through the casting nozzle. After the metal liquid is injected into the roll gap of the casting roller, it is cooled, crystallized and deformed to form the current collector.

[0003] The pole piece of the battery includes a current collector and an active material layer on the surface of the current collector. The active material layer, as an electrode material, is the main component for storing and releasing electric energy. The part of the pole piece coated with the active material layer forms the main body part of the pole piece, and the part without the active material layer forms the tab. In order to improve the energy density of the battery, the pole piece needs to be stretched.

[0004] Generally, the pole piece can be stretched by cold pressing process. In the cold pressing process, the main body part is stretched under the pressure of the roller, while the tab cannot contact the roller because it is not coated with the active material layer. In order to avoid the problem of wrinkles caused by the inconsistent tension between the tab and the main body part, the tab needs to be stretched to apply greater tension to the tab to stretch the tab to the same level as the main body part. However, in the process of stretching the tab, the tab is prone to breakage, resulting in the breakage of the pole piece. UTILITY MODEL CONTENT

[0005] The present application aims to solve at least one of the technical problems in the background art. Therefore, one object of the present application is to provide a casting nozzle, a casting mill, a current collector, a battery monomer and a battery, which can help to solve the problem of breakage of the pole piece in the cold pressing process.

[0006] Embodiments of the first aspect of the present application provide a casting nozzle, which comprises: a casting nozzle body, the casting nozzle body comprising a first feeding cavity and at least one second feeding cavity which are independent of and adjacent to each other, the feeding sides of the first feeding cavity and the second feeding cavity being in communication with a first feeding port and a second feeding port of the casting nozzle respectively; the casting nozzle body further comprises: a converging cavity in communication with a discharging port of the casting nozzle, the converging cavity being located at the discharging side of the first feeding cavity and the second feeding cavity and being in communication with the first feeding cavity and the second feeding cavity.

[0007] In the technical solution of the embodiment of the present application, the metal liquid of different components can be respectively input into the first material conveying cavity and the second material conveying cavity from the first feeding port and the second feeding port respectively, and the metal liquid of different components can be respectively used to form the tab area and the main body area of the current collector. The converging cavity is in communication with the discharge side of the first material conveying cavity and the second material conveying cavity, so that the different metal liquids in the first material conveying cavity and the second material conveying cavity can be respectively output to the converging cavity. In the converging cavity, the interface is fused to realize the convergence. After the converged liquid is injected into the roll gap of the casting and rolling roller, the liquid is cooled, crystallized and deformed, and finally the components of the tab area and the main body area of the current collector are different, thereby realizing the difference in tensile strength of the tab area and the main body area, so that the tensile strength of the tab area in the current collector can be less than that of the main body area, and then in the process of stretching the tab, without using excessive force, the tab can be extended to be consistent with the main body part, thereby solving the problem that the tab of the pole piece is easily broken in the cold pressing process, thereby causing the pole piece to break.

[0008] In some embodiments, the discharge side of the first material conveying cavity includes a first outlet, the discharge side of the second material conveying cavity includes a second outlet, the first outlet is adjacent to the second outlet, and the width of the first outlet is greater than the width of the second outlet along the arrangement direction of the first outlet and the second outlet. By setting the width dimensions of the first material conveying cavity and the second material conveying cavity to be different, the metal liquid conveyed through the first material conveying cavity can form the main body area of the current collector, the metal liquid conveyed through the second material conveying cavity can form the tab area of the current collector, and the width dimension of the main body area is greater than that of the tab area, so that the area of the active material layer coated on the main body area is larger, which is beneficial to improving the energy density of the battery.

[0009] In some embodiments, the ratio of the width of the first outlet to the width of the second outlet is 3-35 along the arrangement direction of the first outlet and the second outlet. Within this range, the width of the first outlet is greater than the width of the second outlet, which can form a current collector that meets the requirements. In addition, within this range, the width of the second outlet is not too small compared to the width of the first outlet, so that after the metal liquids in the first material conveying cavity and the second material conveying cavity converge, the metal liquid in the second material conveying cavity will not be completely fused with the metal liquid in the first material conveying cavity due to being too small, which is beneficial to forming a current collector with a difference in tensile strength.

[0010] In some embodiments, the length of the confluence cavity is less than the length of the first feeding cavity and the length of the second feeding cavity in the feeding direction of the confluence cavity. In this way, the length of the confluence cavity is relatively short, which can avoid the problem of excessive fusion of the metal liquid in the first feeding cavity and the second feeding cavity due to the long confluence time of the metal liquid in the confluence cavity, and is beneficial to form a metal strip with a difference in tensile strength. When the metal strip is used as a current collector, the size of the junction between the tab area and the main body area is small, which can maintain a relatively obvious composition difference between the tab area and the main body area, so that the tensile strength of the tab area is less than that of the main body area.

[0011] In some embodiments, the casting nozzle body comprises a first part and a second part, and the first part covers the second part to jointly form the first feeding cavity, the second feeding cavity and the confluence cavity with the second part. By cooperating the first part and the second part to form the first feeding cavity, the second feeding cavity and the confluence cavity, the process for preparing the first feeding cavity, the second feeding cavity and the confluence cavity with a specific shape is simplified.

[0012] In some embodiments, at least one of the first part and the second part comprises a recess structure, a wall portion on one side of the recess structure in a second direction is provided with a first opening and a second opening, the first opening is used to constitute the first feeding port, the second opening is used to constitute the second feeding port, the other side of the recess structure in the second direction is an open structure as a whole, and the open structure is used to constitute the discharge port, the second direction is perpendicular to the recess direction of the recess structure. The recess structure comprises a first area and a second area arranged along the second direction, and the first area is used to constitute the confluence cavity. At least one first blocking portion is arranged in the second area to separate the second area into a first sub-portion and a second sub-portion which are independent of each other in a direction perpendicular to the second direction, the first opening is arranged in the first sub-portion, the second opening is arranged in the second sub-portion, the first sub-portion is used to constitute the first feeding cavity, and the second sub-portion is used to constitute the second feeding cavity. In this way, by arranging the recess structure and the first blocking portion in at least one of the first part and the second part, the recess structure can be partitioned, and different areas are used to constitute the first feeding cavity, the second feeding cavity and the confluence cavity respectively, which simplifies the structure of the casting nozzle and further simplifies the preparation process of the casting nozzle.

[0013] In some embodiments, one of the first part and the second part is provided with the recess structure and the at least one first blocking portion, and the surface of the other of the first part and the second part adjacent to the recess structure and the first blocking portion is a plane. In this way, by arranging the recess structure and the first blocking portion in only one of the first part and the second part, the preparation process of the casting nozzle can be further simplified.

[0014] In some embodiments, the first part and the second part are each provided with a recess structure and at least one first barrier, and the recess structures in the first part and the second part are correspondingly arranged, and the first barriers in the first part and the second part are correspondingly arranged, to jointly define the first material conveying cavity, the second material conveying cavity and the confluence cavity. The recess structures and the first barriers are arranged in the first part and the second part, and the first material conveying cavity, the second material conveying cavity and the confluence cavity are jointly formed by the two recess structures, so that the volume of the first material conveying cavity, the second material conveying cavity and the confluence cavity formed can be increased, thereby the flow of the metal liquid conveyed through the casting nozzle can be increased, and the production efficiency can be improved.

[0015] In some embodiments, the recess depth of the recess structure gradually decreases from far away from the opening structure to close to the opening structure. In this way, the first material conveying cavity, the second material conveying cavity and the confluence cavity formed have a slope, which is beneficial for the transmission of the metal liquid and also beneficial for forming an outlet with an elongated shape to accurately inject the metal liquid into the roll gap of the casting roll.

[0016] In some embodiments, the casting nozzle further comprises a plurality of first flow resistance blocks arranged in the first material conveying cavity, the plurality of first flow resistance blocks are arranged in intervals along a direction perpendicular to the material conveying direction of the first material conveying cavity to define a plurality of first material conveying channels in the first material conveying cavity, and each first material conveying channel is in communication with the first material inlet. By arranging the plurality of first flow resistance blocks to form the plurality of first material conveying channels, the metal liquid in the first material conveying cavity can be divided into the plurality of first material conveying channels for transmission, the flow at different positions inside the first material conveying cavity can be balanced, and the splashing and backflow of the metal liquid can be prevented, and the uniformity of the metal liquid transmitted through the first material conveying cavity can be improved.

[0017] In some embodiments, the casting nozzle further comprises at least one second flow resistance block arranged in the second material conveying cavity, and the at least one second flow resistance block defines at least two second material conveying channels in the second material conveying cavity, and each second material conveying channel is in communication with the second material inlet. By arranging the second flow resistance block in the second material conveying cavity to form the at least two second material conveying channels, the metal liquid in the second material conveying cavity can be divided into the plurality of second material conveying channels for transmission, the flow at different positions inside the second material conveying cavity can be balanced, and the splashing and backflow of the metal liquid can be prevented, and the uniformity of the metal liquid transmitted through the second material conveying cavity can be improved.

[0018] Embodiments of the second aspect of the present application provide a casting and rolling machine, which comprises the casting nozzle in the above embodiments, the first material conveying cavity of the casting nozzle is used to convey the first metal liquid, the second material conveying cavity is used to convey the second metal liquid, and the first metal liquid and the second metal liquid form a confluence metal liquid after passing through the confluence cavity. The casting and rolling machine further comprises a casting and rolling roll which receives the confluence metal liquid and forms a metal strip comprising a first area and at least one second area, the first area comprises the first metal, and the second area comprises the second metal.

[0019] The embodiment of the third aspect of the present application provides a current collector prepared by the casting mill in the above embodiment, the current collector comprising: a main body area; and a tab area, the tab area being located at least one side of the main body area, the tensile strength of the main body area being greater than the tensile strength of the tab area.

[0020] The embodiment of the fourth aspect of the present application provides a battery monomer, the battery monomer comprising the current collector in the above embodiment.

[0021] The embodiment of the fifth aspect of the present application provides a battery, the battery comprising the battery monomer in the above embodiment.

[0022] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0023] In the drawings, the same reference numbers in the several drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments according to the present disclosure, and should not be regarded as limiting the scope of the present application.

[0024] Figure 1 The exploded structural schematic diagram of the current collector of some embodiments of the present application;

[0025] Figure 2 The exploded structural schematic diagram of the battery of some embodiments of the present application;

[0026] Figure 3 The exploded structural schematic diagram of the battery monomer of some embodiments of the present application;

[0027] Figure 4 The sectional view of the casting nozzle body of some embodiments of the present application;

[0028] Figure 5 The perspective view of the casting nozzle of some embodiments of the present application;

[0029] Figure 6 The perspective view of the first part (second part) of some embodiments of the present application;

[0030] Figure 7 The sectional view of the casting nozzle body of some embodiments of the present application;

[0031] Figure 8 The perspective view of the first part (second part) of some embodiments of the present application;

[0032] Figure 9 System diagram of a rolling mill for some embodiments of the present application;

[0033] Figure 10 Structural diagram of a vehicle for some embodiments of the present application.

[0034] Legend of reference signs:

[0035] Vehicle 1000, first sub-portion 1041, second sub-portion 1042;

[0036] Battery 100, first feeding cavity 101, second feeding cavity 102, confluence cavity 103, recessed structure 104, first area 104a, second area 104b, first blocking portion 105, first flow blocking block 106, second flow blocking block 107;

[0037] Controller 200, main body area 241, tab area 242;

[0038] Motor 300;

[0039] Box 10, upper cover 11, box body 12;

[0040] Battery cell 20, end cover 21, electrode terminal 21a, shell 22, electrode assembly 23, tab 23a, current collector 24;

[0041] First portion 31, second portion 32;

[0042] First opening 41, second opening 42;

[0043] First side 51, second side 52, third side 53, fourth side 54;

[0044] First feeding channel 61, second feeding channel 62;

[0045] First feeding port 1, second feeding port 2, discharging port 3;

[0046] First direction X, second direction Y. DETAILED DESCRIPTION

[0047] The embodiments of the technical solutions of the present application will be described in detail below in combination with the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise required by context, singular terms shall include pluralities and vice versa. Unless otherwise required by context, the use herein of the singular is also to be construed as a use of the plural and vice versa.

[0049] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly and specifically limited.

[0050] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification is not necessarily all referring to the same embodiment, or to a particular embodiment, or to a particular set of embodiments. It will be explicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0052] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0053] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as limiting the embodiments of the present application, which do not indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0054] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, can also be detachably connected, or integrated; can be mechanically connected, can also be electrically connected; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0055] Reference Figure 1 The current collector 24 includes a main body area 241 and a tab area 242 located on at least one side of the main body area 241, the main body area 241 is used to carry the active material layer to form the main body of the tab, and the tab area 242 is used to form the tab ear.

[0056] The metal liquid is input into the roll gap of the casting roller via the feeding cavity of the casting nozzle. Since the current casting nozzle usually only includes one feeding cavity, the composition of the metal liquid input into the roll gap of the casting roller is single, and the composition of the formed current collector 24 is also single. That is, the composition of the main body area 241 and the tab area 242 of the current collector 24 is consistent, so that the tensile strength and the elongation of the main body area 241 and the tab area 242 of the current collector 24 are consistent. In the cold pressing process, a larger force needs to be used to stretch the tab ear to extend the tab ear to be consistent with the main body area 241, but this will make the tab area 242 of the current collector 24 more easily reach the tensile breaking point compared with the main body area 241, thereby making the tab ear prone to breakage, resulting in tab breakage.

[0057] Based on the above considerations, in order to solve the problem that the tab is prone to breakage in the cold pressing process, a casting nozzle is designed, wherein the casting nozzle body includes a first feeding cavity and a second feeding cavity which are independent of each other and adjacent to each other, and the casting nozzle body further includes a converging cavity which is in communication with the discharge side of the first feeding cavity and the second feeding cavity, respectively.

[0058] In the casting process of the current collector, the casting nozzle is used to respectively input the metal liquid of different compositions from the first feeding port and the second feeding port into the first feeding cavity and the second feeding cavity, respectively, and the metal liquid of different compositions can be used to form the tab area and the main body area of the current collector, respectively. The metal liquid of different compositions is respectively input from the first feeding cavity and the second feeding cavity into the confluence cavity, fusion occurs at the junction in the confluence cavity, and confluence is realized. After the confluence of the liquid into the roll gap of the casting roller, cooling, crystallization and deformation are performed, and finally a current collector with composition difference can be formed, and the composition of the tab area and the main body area of the finally formed current collector has difference, so as to realize the difference in tensile strength of the tab area and the main body area, so that the tensile strength of the tab area in the current collector can be less than that of the main body area, and then in the process of stretching the tab, without using excessive tension, the tab can be stretched to be consistent with the main body part, thereby solving the problem that the tab of the pole piece is easily broken in the cold pressing process, thereby causing the pole piece to break.

[0059] The casting nozzle disclosed in the embodiments of the present application can be used in the preparation process of metal strip, and the metal strip can include but is not limited to the preparation of batteries. Exemplarily, the metal strip can be used as a current collector.

[0060] Please refer to Figure 2 , Figure 2 The battery provided by some embodiments of the present application is shown in the exploded structural view. The battery 100 can include a box body 10 and a battery cell 20, and the battery cell 20 is accommodated in the box body 10. The box body 10 is used to provide an accommodation space for the battery cell 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include an upper cover 11 and a box body 12, and the upper cover 11 and the box body 12 are mutually covered to jointly define an accommodation space for accommodating the battery cell 20.

[0061] In the battery 100, the battery cell 20 can be multiple, and the multiple battery cells 20 can be connected in series, connected in parallel, or connected in a mixed manner. The mixed connection means that some of the multiple battery cells 20 are connected in series and some are connected in parallel. Each battery cell 20 can be a secondary battery or a primary battery, and can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0062] Please refer to Figure 3 , Figure 3 The battery cell 20 provided by some embodiments of the present application is shown in the exploded structural view. The battery cell 20 refers to the smallest unit that constitutes a battery. As Figure 3 , the battery cell 20 includes an end cover 21, a shell 22, an electrode assembly 23, and other functional components.

[0063] The end cap 21 refers to a component that is fitted to an opening of the case 22 to insulate an internal environment of the battery cell 20 from an external environment. The end cap 21 can be provided with functional components such as an electrode terminal 21a. The electrode terminal 21a can be used to electrically connect with the electrode assembly 23 for outputting or inputting electric energy of the battery cell 20.

[0064] The case 22 is a component that is used in conjunction with the end cap 21 to form an internal environment of the battery cell 20, in which the electrode assembly 23, electrolyte, and other components can be accommodated.

[0065] The electrode assembly 23 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 can be contained within the case 22. The electrode assembly 23 is mainly formed by winding or layering a jelly-roll. The jelly-roll can include a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The jelly-roll includes a current collector and an active material that covers a portion of the surface of the current collector, in which a portion of the jelly-roll having the active material constitutes a main body of the electrode assembly, and a portion of the jelly-roll not having the active material constitutes a tab 23a. During charging and discharging of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 23a is connected to an electrode terminal to form a current loop.

[0066] The current collector can include, but is not limited to, a copper foil, an aluminum foil, and the like metal strips.

[0067] The casting nozzle provided by the embodiment of the present application is characterized in that the casting nozzle comprises a nozzle body. Figure 4 The nozzle body comprises a first feeding cavity 101 and at least one second feeding cavity 102 which are independent of and adjacent to each other, and the feeding sides of the first feeding cavity 101 and the second feeding cavity 102 are communicated with a first feeding port 1 and a second feeding port 2 of the nozzle respectively; the nozzle body further comprises a converging cavity 103 which is communicated with a discharging port 3 of the nozzle, and the converging cavity 103 is located at the discharging sides of the first feeding cavity 101 and the second feeding cavity 102 and is communicated with the first feeding cavity 101 and the second feeding cavity 102.

[0068] The feeding side of the first feeding cavity 101 is a side where the metal liquid is input into the first feeding cavity 101, and the discharging side of the first feeding cavity 101 is a side where the metal liquid is output from the first feeding cavity 101. The metal liquid is input into the first feeding cavity 101 from the first feeding port 1, and the metal liquid is input into the second feeding cavity 102 from the second feeding port 2. The metal liquid input into the first feeding cavity 101 and the metal liquid input into the second feeding cavity 102 can be different metal liquids.

[0069] The first feeding port 1 and the first feeding cavity 101 are in one-to-one correspondence, and the second feeding port 2 and the second feeding cavity 102 are in one-to-one correspondence. In other words, one first feeding port 1 communicates with one first feeding cavity 101, and one second feeding port 2 communicates with one second feeding cavity 102. Exemplarily, the number of the first feeding cavity 101 can be 1, the number of the second feeding cavity 102 can be 1, and the number of the first feeding port 1 and the second feeding port 2 is both 1. The number of the first feeding cavity 101 can be 1, the number of the second feeding cavity 102 can be 2, the number of the first feeding port 1 is 1, and the number of the second feeding port 2 is 2. The two second feeding cavities 102 can be located on the opposite sides of the first feeding cavity 101.

[0070] The metal liquid transported by the first feeding cavity 101 and the metal liquid transported by the second feeding cavity 102 are both output from the discharge side to the confluence cavity 103, and then output from the discharge port 3 of the casting nozzle after confluence in the confluence cavity 103. The metal liquids in the first feeding cavity 101 and the second feeding cavity 102 can be of different compositions. After the metal liquids of different compositions flow into the confluence cavity 103, only the boundaries of the two liquids are fused, so that the confluence of the metal liquids forms two regions of different compositions. After the confluence of the liquids is injected into the roll gap of the casting roll, the liquid is cooled, crystallized, and deformed to form a metal strip. The metal strip can include a first region and a second region, and the composition of the metal in the first region is different from the composition of the metal in the second region, so that the tensile strength of the first region and the second region is different.

[0071] Exemplarily, the metal liquid can be aluminum liquid, and the aluminum liquid can further include Fe (iron) and Si (silicon) components. The aluminum liquid input into the first feeding cavity 101 can be first aluminum liquid, and the aluminum liquid input into the second feeding cavity 102 can be second aluminum liquid. The first aluminum liquid can include more than 99.0% of aluminum component, the second aluminum liquid can include more than 99.6% of aluminum component, the first aluminum liquid includes more Fe component than the second aluminum liquid, and the first aluminum liquid includes more Si component than the second aluminum liquid. After the aluminum liquid flows together and is cast-rolled by the cast-rolling roller, the aluminum foil is formed, and the aluminum foil includes a first region and a second region. The first region includes the component of the first aluminum liquid, and the second region includes the component of the second aluminum liquid. In this way, the tensile strength of the first region of the aluminum foil can be greater than that of the second region, and the tensile rate of the first region is substantially the same as that of the second region, or even the tensile rate of the second region is greater than that of the first region. The tensile strength refers to the maximum stress value that the material can withstand during the stretching process. In the case of achieving the same tensile rate, the greater the tensile strength, the greater the force required to be applied to the material. In the case that the tensile strength of the first region is greater than that of the second region, and the tensile rate of the first region is substantially the same as that of the second region, if the second region is to be stretched to be consistent with the first region, the tension on the second region is smaller than that on the first region. In the case that the aluminum foil is used as the current collector of the battery, the first region can be the main body region of the current collector, and the second region can be the tab region of the current collector. In this way, during the cold pressing process, the tab region does not need to be subjected to excessive tension, and the tab region can be stretched to be consistent with the main body region, thereby improving the problem of the tab region being broken due to excessive tension on the tab region.

[0072] The first feeding port 1 and the discharge port 3 are located on different sides of the casting nozzle, and the second feeding port 2 and the discharge port 3 are located on different sides of the casting nozzle.

[0073] In some embodiments, the first feeding port 1 and the second feeding port 2 can be located on the same side of the casting nozzle, the arrangement direction of the first feeding port 1 and the second feeding port 2 can be the same as the arrangement direction of the first feeding cavity 101 and the second feeding cavity 102, and the first feeding port 1 and the second feeding port 2 are both arranged opposite to the discharge port 3.

[0074] In other embodiments, the first feeding port 1 and the second feeding port 2 can also be located on different sides of the casting nozzle.

[0075] In the technical solution, the first feeding cavity 101, the second feeding cavity 102 and the converging cavity 103 are arranged, in the case that the nozzle is used for collecting the current collector, the composition of the tab area and the main body area of the finally formed current collector is different, so that the tensile strength of the tab area and the main body area is different, the tensile strength of the tab area in the current collector can be less than the tensile strength of the main body area, and then in the process of stretching the tab, the tab can be stretched to be consistent with the main body part without using excessive tension, and the problem that the tab of the pole piece is easily broken in the cold pressing process to cause the pole piece to be broken is solved.

[0076] With reference to the foregoing Figure 4 According to some embodiments of the present application, the discharge side of the first feeding cavity 101 comprises a first outlet, the discharge side of the second feeding cavity 102 comprises a second outlet, the first outlet is adjacent to the second outlet, and the width W1 of the first outlet is greater than the width W2 of the second outlet along the arrangement direction of the first outlet and the second outlet.

[0077] The arrangement direction of the first outlet and the second outlet is parallel to the arrangement direction of the first feeding cavity 101 and the second feeding cavity 102. In some embodiments, the first outlet is opposite to the first feeding port 1 in the first direction X, the second outlet is opposite to the second feeding port 2 in the first direction X, the first direction X is perpendicular to the arrangement direction of the first feeding cavity 101 and the second feeding cavity 102, the first direction X is the feeding direction of the first feeding cavity 101 and the second feeding cavity 102, and the arrangement direction of the first outlet and the second outlet is perpendicular to the feeding direction.

[0078] It can be understood that the width ratio of the first outlet and the second outlet along the arrangement direction of the first outlet and the second outlet determines the width ratio of the two regions of different compositions in the converged metal liquid to a great extent, thereby affecting the width ratio of the first region and the second region of the finally formed metal strip in the arrangement direction. The width W1 of the first outlet is greater than the width W2 of the second outlet, and then in the finally formed metal strip, the width of the first region is greater than the width of the second region along the arrangement direction of the first region and the second region.

[0079] In some embodiments, the width of the first outlet is the same as the width of the first feeding cavity 101, and the width of the second outlet is the same as the width of the second feeding cavity 102 along the arrangement direction of the first outlet and the second outlet.

[0080] In some other embodiments, the width of the first outlet can also be different from the width of the first feeding cavity 101, and the width of the second outlet can also be different from the width of the second feeding cavity 102 along the arrangement direction of the first outlet and the second outlet.

[0081] In the technical solution, the width of the first feeding cavity 101 is different from the width of the second feeding cavity 102, so that the metal liquid fed through the first feeding cavity 101 can form the main body area of the current collector, the metal liquid fed through the second feeding cavity 102 can form the tab area of the current collector, and the width of the main body area is greater than the width of the tab area, so that the area of the active material layer coated on the main body area is larger, which is beneficial to improve the energy density of the battery.

[0082] According to some embodiments of the present application, the ratio of the width W1 of the first outlet to the width W2 of the second outlet along the arrangement direction of the first outlet and the second outlet is 3-35.

[0083] Exemplarily, the ratio of the width W1 of the first outlet to the width W2 of the second outlet can be 3.3, 10, 15, 18, 25, 30 or 33.

[0084] In some embodiments, the width W1 of the first outlet can be 100-1000 mm, and the width W2 of the second outlet can be 30 mm.

[0085] In the technical solution, the ratio of the width of the first outlet to the width of the second outlet is 3-35, in this range, the width of the first outlet is greater than the width of the second outlet, which can form a current collector meeting the requirements. In addition, in this range, the width of the second outlet is not too small compared with the width of the first outlet, so that after the metal liquid in the first feeding cavity 101 and the second feeding cavity 102 converges, the metal liquid in the second feeding cavity 102 will not be completely fused with the metal liquid in the first feeding cavity 101 due to being too small, which is beneficial to form a current collector with different tensile strengths.

[0086] According to some embodiments of the present application, along the feeding direction of the converging cavity 103, the length of the converging cavity 103 is less than the length of the first feeding cavity 101, and the length of the converging cavity 103 is less than the length of the second feeding cavity 102.

[0087] Exemplarily, the length of the converging cavity 103 can be 2 mm.

[0088] The feeding direction of the converging cavity 103 is the transmission direction of the metal liquid in the converging cavity 103, that is, the direction of the discharging side of the first feeding cavity 101 and the second feeding cavity 102 pointing to the discharging port 3. The feeding direction of the converging cavity 103 can be consistent with the feeding direction of the first feeding cavity 101 and the second feeding cavity 102.

[0089] The feeding direction of the first feeding cavity 101 is the direction of the metal liquid in the first feeding cavity 101, and the feeding direction of the second feeding cavity 102 is the direction of the metal liquid in the second feeding cavity 102. For example, the feeding direction is the first direction X, the feeding outlet 3 is located on one side of the first direction X of the first feeding cavity 101 and the second feeding cavity 102, and the feeding outlet 3 is opposite to the feeding sides of the first feeding cavity 101 and the second feeding cavity 102 in the first direction X.

[0090] In some embodiments, the length of the first feeding cavity 101 along the feeding direction of the first feeding cavity 101 can be equal to the length of the second feeding cavity 102.

[0091] It can be understood that, along the feeding direction of the confluence cavity 103, the longer the length of the confluence cavity 103 is, the longer the confluence time of the metal liquid in the first feeding cavity 101 and the metal liquid in the second feeding cavity 102 in the confluence cavity 103 is. If the confluence time is too long, the problem that the metal liquid in the first feeding cavity 101 and the metal liquid in the second feeding cavity 102 are not only fused at the boundary may occur, that is, the metal liquid in the first feeding cavity 101 and the metal liquid in the second feeding cavity 102 may be fused too much, so that most of the metal liquid after backflow is fused together, and then after the metal strip is formed, the first region and the second region cannot be distinguished, resulting in the problem that the strength difference of the metal strip is not obvious.

[0092] In the above technical solution, the length of the confluence cavity 103 is relatively short, which can to some extent avoid the problem that the metal liquid in the first feeding cavity 101 and the metal liquid in the second feeding cavity 102 are fused together too much due to the too long confluence time in the confluence cavity 103, and is beneficial to form a metal strip with a tensile strength difference. When the metal strip is used as a current collector, the size of the junction between the tab region and the main body region is small, and then the composition difference between the tab region and the main body region is relatively obvious, so that the tensile strength of the tab region is less than that of the main body region.

[0093] Reference Figure 5 According to some embodiments of the present application, the nozzle body includes a first part 31 and a second part 32, and the first part 31 covers the second part 32 to form the first feeding cavity 101, the second feeding cavity 102 and the confluence cavity 103 together with the second part 32.

[0094] At least one of the first part 31 and the second part 32 has a configuration of the first feeding cavity 101, the second feeding cavity 102 and the converging cavity 103, so that after the first part 31 is covered on the second part 32, the first feeding cavity 101, the second feeding cavity 102 and the converging cavity 103 are formed between the first part 31 and the second part 32.

[0095] The first part 31 can include a first intermediate part arranged along a length direction and first side parts located on both sides of the first intermediate part, and the second part 32 can include a second intermediate part arranged along a length direction and second side parts located on both sides of the second intermediate part. The first intermediate part is covered on the second intermediate part to enclose the first feeding cavity 101, the second feeding cavity 102 and the converging cavity 103, and the first feeding port 1, the second feeding port 2 and the outlet port 3 are arranged on the first intermediate part and the second intermediate part. The two first side parts are respectively covered on the two second side parts, and the surfaces of the first side parts and the second side parts close to each other can be planes, so that the first side parts and the second side parts are close to each other, and then the metal liquid flowing through the nozzle can only flow through the first feeding port 1, the second feeding port 2 and the outlet port 3 and the outside.

[0096] The first part 31 and the second part 32 can be connected by means including but not limited to bolt connection and the like.

[0097] In the above technical solution, the first feeding cavity 101, the second feeding cavity 102 and the converging cavity 103 are formed by cooperation of the first part 31 and the second part 32, which is beneficial to simplify the process of preparing the first feeding cavity 101, the second feeding cavity 102 and the converging cavity 103 with a specific shape.

[0098] Reference Figure 6According to some embodiments of the present application, at least one of the first part 31 and the second part 32 comprises a recess structure 104, a wall portion of one side of the recess structure 104 in the second direction Y is provided with the first opening 41 and the second opening 42, the first opening 41 is used to form the first feeding port 1, and the second opening 42 is used to form the second feeding port 2, the other side of the recess structure 104 in the second direction Y is an open structure as a whole, and the open structure is used to form the discharging port 3, the second direction Y is perpendicular to the recess direction of the recess structure 104, wherein the recess structure 104 comprises a first area 104a and a second area 104b arranged along the second direction Y, the first area 104a is used to form the flow collection cavity 103. At least one of the first part 31 and the second part 32 further comprises at least one first blocking portion 105, the first blocking portion 105 is arranged in the second area 104b to separate the second area 104b into a first sub-area 1041 and a second sub-area 1042 which are independent of each other along a direction perpendicular to the second direction Y, wherein the first opening 41 is arranged in the first sub-area 1041, and the second opening 42 is arranged in the second sub-area 1042, the first sub-area 1041 is used to form the first feeding cavity 101, and the second sub-area 1042 is used to form the second feeding cavity 102.

[0099] The recess structure 104 is a semi-enclosed structure, in other words, the recess structure 104 is a structure surrounded by three sides. For example, the recess structure 104 can comprise a first side 51, a second side 52, a third side 53 and a fourth side 54, the first side 51, the second side 52, the third side 53 and the fourth side 54 are distributed on the circumferential side of the recess structure 104, the first side 51 and the second side 52 are arranged along the second direction Y, and the arrangement direction of the third side 53 and the fourth side 54 is perpendicular to the second direction Y. Among them, the second side 52, the third side 53 and the fourth side 54 are all provided with a wall portion, and the first side 51 is an open structure without a wall portion. The first opening 41 and the second opening 42 can be arranged on the wall portion of the second side 52.

[0100] For the convenience of description, the recess structure 104 is divided into a first area 104a and a second area 104b arranged along the second direction Y in the embodiment. The opening structure of the first side 51 of the recess structure 104 is located in the first area 104a, and the first opening 41 and the second opening 42 are located in the second area 104b. The first barrier 105 extends along the second direction Y, wherein one end of the first barrier 105 can be connected to the wall portion of the second side 52 of the recess structure 104, and the other end of the first barrier 105 is flush with the junction of the first area 104a and the second area 104b. In other words, the first barrier 105 spans the second area 104b along the second direction Y, so as to separate the second area 104b into a first sub-area 1041 and a second sub-area 1042 independent of each other. The first barrier 105 is not located in the first area 104a, so that the first area 104a can form an independent cavity, and the independent cavity is in communication with the first sub-area 1041 and the second sub-area 1042, and the independent cavity can serve as the confluence cavity 103.

[0101] In the arrangement direction of the first area 104a and the second area 104b, the width dimension of the first area 104a is greater than the width dimension of the second area 104b, the width dimension of the first opening 41 can be less than the width dimension of the first area 104a, and the width dimension of the second opening 42 can be equal to the width dimension of the second area 104b. In this way, a larger spacing distance is provided between the first opening 41 and the second opening 42, so that a larger spacing distance is provided between the first feeding port 1 and the second feeding port 2 formed by the first opening 41 and the second opening 42, and the probability of accidental fusion can be reduced when different components of metal liquid are respectively input into the first feeding port 1 and the second feeding port 2.

[0102] One end of the first barrier 105 and the side wall of the second side 52 of the recess structure 104 can be connected by welding, bonding or bolt connection, etc. The first barrier 105 and the bottom surface of the recess structure 104 can be connected by welding or bonding, etc. The bottom surface of the recess structure 104 is the bottom surface in the recess direction of the recess structure 104.

[0103] In some embodiments, the first portion 31 and the second portion 32 can be provided with one first barrier 105, so as to divide the second area 104b into one first sub-area 1041 and one second sub-area 1042, thereby forming one first feeding cavity 101 and one second feeding cavity 102, and the first opening 41 and the second opening 42 can be one.

[0104] The recess structure 104 and the first barrier 105 in the recess structure 104 can be provided only in the first intermediate portion of the first portion 31, or only in the second intermediate portion of the first portion 31, or in the first intermediate portion of the first portion 31 and the second intermediate portion of the second portion 32. When provided in the first intermediate portion of the first portion 31 and the second intermediate portion of the second portion 32, the recess structure 104 and the first barrier 105 in the first intermediate portion are symmetrical with the recess structure 104 and the first barrier 105 in the second portion 32.

[0105] In the above technical solution, by providing the recess structure 104 and the first barrier 105 in the recess structure 104 on at least one of the first portion 31 and the second portion 32, the recess structure 104 can be divided into different areas, and the different areas are used to form the first feeding cavity 101, the second feeding cavity 102 and the confluence cavity 103 respectively, thereby simplifying the structure of the nozzle and the manufacturing process of the nozzle.

[0106] According to some embodiments of the present application, one of the first portion 31 and the second portion 32 is provided with the recess structure 104 and the at least one first barrier 105, and the surface of the other of the first portion 31 and the second portion 32 adjacent to the recess structure 104 and the first barrier 105 is a plane.

[0107] Taking the case that the recess structure 104 and the first barrier 105 are provided in the first portion 31, the second portion 32 covers the recess structure 104 and the first barrier 105, so as to form the first feeding cavity 101, the second feeding cavity 102 and the confluence cavity 103. The surface of the second portion 32 facing the first portion 31 is a plane, so that the shape of the recess structure 104 and the first barrier 105 in the first portion 31 is the shape of the first feeding cavity 101, the second feeding cavity 102 and the confluence cavity 103.

[0108] It is worth noting that the surface of the second part 32 facing the first part 31 is in contact with the top surface of the first barrier 105, so that there is no gap between the first barrier 105 and the second part 32, so that the first material conveying cavity 101 and the second material conveying cavity 102 are isolated in the direction adjacent to each other, so that the metal liquid being transported in the first material conveying cavity 101 and the second material conveying cavity 102 cannot be fused with each other.

[0109] The recess structure 104 and the first barrier 105 provided on the second part 32 are similar to the above, and will not be described here.

[0110] In the above technical solution, the recess structure 104 and the first barrier 105 are provided in the first part 31 or the second part 32, which can simplify the preparation process of the nozzle.

[0111] According to some embodiments of the present application, the first part 31 and the second part 32 are both provided with the recess structure 104 and at least one first barrier 105, and the recess structures 104 in the first part 31 and the second part 32 are correspondingly arranged, and the first barriers 105 in the first part 31 and the second part 32 are correspondingly arranged, to jointly define the first material conveying cavity 101, the second material conveying cavity 102 and the confluence cavity 103.

[0112] In other words, in the projection plane perpendicular to the arrangement direction of the first part 31 and the second part 32, the first part 31 The first projection of the recess structure 104 coincides with the first projection of the recess structure 104 of the second part 32, and the first projection of the first barrier 105 of the first part 31 coincides with the first projection of the first barrier 105 of the second part 32.

[0113] The first region 104a of the recess structure 104 of the first part 31 and the first region 104a of the recess structure 104 of the second part 32 are oppositely arranged to jointly constitute the confluence cavity 103. The first sub-portion 1041 of the recess structure 104 of the first part 31 and the first sub-portion 1041 of the recess structure 104 of the second part 32 are oppositely arranged to jointly constitute the first material conveying cavity 101. The second sub-portion 1042 of the recess structure 104 of the first part 31 and the second sub-portion 1042 of the recess structure 104 of the second part 32 are oppositely arranged to jointly constitute the second material conveying cavity 102.

[0114] The first barrier 105 of the first part 31 and the first barrier 105 of the second part 32 are correspondingly arranged, and the surfaces of the first barrier 105 of the first part 31 and the first barrier 105 of the second part 32 close to each other are in contact, so as to isolate the first material conveying cavity 101 and the second material conveying cavity 102.

[0115] In the technical solution, the recess structure 104 and the first blocking part 105 are arranged in the first part 31 and the second part 32, and the two recess structures 104 jointly form the first material conveying cavity 101, the second material conveying cavity 102 and the flow converging cavity 103, so that the volume of the first material conveying cavity 101, the second material conveying cavity 102 and the flow converging cavity 103 formed is increased, the flow of the molten metal conveyed through the casting nozzle is increased, and the production efficiency is improved.

[0116] According to some embodiments of the present application, the recess depth of the recess structure 104 gradually decreases from the position far away from the opening structure to the position close to the opening structure.

[0117] The opening structure is the opening structure of the first side 51 of the recess structure 104. The opening structure is used to form the discharge port 3. The recess depth of the recess structure 104 at the opening structure is the smallest. After the first part 31 and the second part 32 are closed to form the casting nozzle, the height of the first material conveying cavity 101, the second material conveying cavity 102, the flow converging cavity 103 and the discharge port 3 in the conveying direction decreases in turn, and the height of the discharge port 3 is the smallest, so that the discharge port 3 can have an elongated shape. Here, the height is parallel to the arrangement direction of the first part 31 and the second part 32.

[0118] In the technical solution, the first material conveying cavity 101, the second material conveying cavity 102 and the flow converging cavity 103 formed have slopes, which is beneficial to the conveying of the molten metal and the formation of the discharge port 3 having an elongated shape, so that the molten metal can be accurately injected into the roll gap of the casting roll.

[0119] As shown in FIGS. 1, 2 and 3, according to some embodiments of the present application, the casting nozzle further comprises a plurality of first flow blocking blocks 106 arranged in the first material conveying cavity 101. The plurality of first flow blocking blocks 106 are arranged at intervals in a direction perpendicular to the conveying direction of the first material conveying cavity 101 to define a plurality of first material conveying passages 61 in the first material conveying cavity 101, and each first material conveying passage 61 is in communication with the first material inlet 1. Figure 7 Figure 8 The gap between the two adjacent first flow blocking blocks 106 forms the first material conveying passage 61.

[0120] In some embodiments, among the plurality of first flow blocking blocks 106 arranged at intervals, at least one of the two first flow blocking blocks 106 located at the outermost positions has a gap with the wall part of the recess structure 104, and the gap also forms the first material conveying passage 61. For example, the recess structure 104 comprises opposite third and fourth sides 53 and 54, and the plurality of first flow blocking blocks 106 are arranged at intervals in a direction from the third side 53 to the fourth side 54. At least one of the two first flow blocking blocks 106 located at the outermost positions has a gap with the wall part of the third side 53 or the fourth side 54.

[0121] In some embodiments, among the plurality of first flow blocking blocks 106 arranged at intervals, at least one of the two first flow blocking blocks 106 located at the outermost positions has a gap with the wall part of the recess structure 104, and the gap also forms the first material conveying passage 61. For example, the recess structure 104 comprises opposite third and fourth sides 53 and 54, and the plurality of first flow blocking blocks 106 are arranged at intervals in a direction from the third side 53 to the fourth side 54. At least one of the two first flow blocking blocks 106 located at the outermost positions has a gap with the wall part of the third side 53 or the fourth side 54. ​

[0122] In some embodiments, the first flow blocks 106 are arranged in a staggered manner. For example, the first flow blocks 106 on the first side 51 and the fourth side 54 are staggered with the first flow blocks 106 on the second side 52 and the third side 53.

[0123] In some embodiments, the width of the first flow passage in the arrangement direction of the first flow passages is constant along the feeding direction of the first flow passage. For example, the first flow blocks 106 can have a cuboid shape.

[0124] In some embodiments, the width of at least part of the first flow passage in the arrangement direction of the first flow passages gradually increases along the feeding direction of the first flow passage. For example, the first flow blocks 106 can include a first portion and a second portion adjacent to each other, and the first portion and the second portion are adjacent to each other along the feeding direction of the first flow passage 101. Along the feeding direction of the first flow passage 101, the width of the first portion in the arrangement direction of the first flow blocks 106 is constant, and the width of the second portion in the arrangement direction of the first flow blocks 106 gradually decreases, which is conducive to accelerating the transmission of the metal liquid.

[0125] The first opening 41 is used to form the first feeding port 1, and the first flow blocks 106 have gaps with the wall of the recessed structure 104 where the first opening 41 is located. For example, the wall of the second side 52 of the recessed structure 104 is provided with the first opening 41, and each first flow block 106 has a gap with the wall of the second side 52, so that the first flow passage 61 formed thereby is in communication with the first feeding port 1.

[0126] In the above technical solution, the plurality of first flow blocks 106 are arranged to form the plurality of first flow passages 61, so that the metal liquid in the first flow passage 101 can be divided into the plurality of first flow passages 61 for transmission, which can balance the flow at different positions inside the first flow passage 101, and also prevent the splashing and backflow of the metal liquid, thereby improving the uniformity of the metal liquid transmitted through the first flow passage 101.

[0127] With reference to Figure 7 and Figure 8 According to some embodiments of the present application, the nozzle further includes at least one second flow block 107 arranged in the second flow passage 102, and the at least one second flow block 107 defines at least two second flow passages 62 in the second flow passage 102, and each second flow passage 62 is in communication with the second feeding port 2.

[0128] In some embodiments, the number of the second flow blocking blocks 107 can be one, and the one second flow blocking block 107 has a gap between the wall of the second material conveying cavity 102, thereby forming the second material conveying passage 62. Here, the wall of the second material conveying cavity 102 refers to the two walls of the second material conveying cavity 102 in the arrangement direction of the first material conveying cavity 101 and the second material conveying cavity 102.

[0129] Considering that the width of the second material conveying cavity 102 is small, the second flow blocking block 107 can be a cuboid shape, so that it can play a role in dividing the metal liquid in the second material conveying cavity 102, and at the same time, it does not occupy too much size in the width direction of the second material conveying cavity 102, so that the width of the second material conveying passage 62 formed is not too small.

[0130] In the above technical solution, at least two second material conveying passages 62 are formed by arranging the second flow blocking block 107 in the second material conveying cavity 102, so that the metal liquid in the second material conveying cavity 102 can be divided into multiple second material conveying passages 62 for transmission, which can balance the flow at different positions inside the second material conveying cavity 102, and also can prevent the splashing and backflow of the metal liquid, and improve the uniformity of the metal liquid transmitted through the second material conveying cavity 102.

[0131] Reference Figure 9 The embodiments of the present application provide a casting and rolling machine, which comprises the casting nozzle 301 in the above embodiments, the first material conveying cavity 101 of the casting nozzle 301 is used for conveying the first metal liquid, the second material conveying cavity 102 is used for conveying the second metal liquid, and the first metal liquid and the second metal liquid form a converged metal liquid after passing through the converging cavity 103. The casting and rolling machine further comprises a casting and rolling roller 302, which receives the converged metal liquid and forms a metal strip comprising a first area and at least one second area, the first area comprises the first metal, and the second area comprises the second metal.

[0132] The first metal liquid and the second metal liquid can be obtained by melting the solid first metal raw material and the second metal raw material, respectively. For example, the casting and rolling machine can comprise a melting furnace 303, and the number of the melting furnace 303 can be two, and the two melting furnaces 303 can melt the first metal raw material and the second metal raw material respectively to obtain the first metal liquid and the second metal liquid.

[0133] The casting and rolling machine can further comprise a holding furnace 304, and the holding furnace 304 of the casting and rolling machine has the same meaning as that commonly understood by those skilled in the art. The number of the holding furnace 304 can be two, and the two holding furnaces 304 refine the first metal liquid and the second metal liquid, respectively. The holding furnace 304 is further provided with a filter, and the filter can block solid impurities in the metal liquid, such as oxide impurities, slag, etc., and the first metal liquid and the second metal liquid are preliminarily filtered.

[0134] The casting and rolling machine can further comprise two filter devices 305, each of which is connected to the outlet 3 of one of the two holding furnaces 304 to filter the first and second liquid metal respectively. The filter device 305 can comprise a combination of plate filter and tube filter.

[0135] The casting and rolling machine can further comprise two foreboxes 306, which are connected to the inlet of the foreboxes 306 respectively to receive the filtered first and second liquid metal from the filter devices 305. The foreboxes 306 serve to buffer and regulate the flow of the first and second liquid metal to maintain the stability and continuity of the supply of liquid metal during the casting and rolling process. The outlet of the foreboxes 306 is connected to the casting nozzle 301, and the outlet of each of the two foreboxes 306 is connected to the first inlet 1 and the second inlet 2 of the casting nozzle 301 respectively, so that the first liquid metal in one of the two foreboxes 306 is fed into the first delivery chamber 101 through the first inlet 1, and the second liquid metal in the other of the two foreboxes 306 is fed into the second delivery chamber 102 through the second inlet 2, and the first and second liquid metal are merged at the junction chamber 103 to form the converged liquid metal, which comprises two regions of the first metal and one region of the second metal.

[0136] The converged liquid metal is delivered from the outlet 3 of the casting nozzle 301 to the nip between the two casting rolls 302. When the high-temperature converged liquid metal contacts the surface of the low-temperature casting rolls 302, the heat of the converged liquid metal is rapidly taken away by the casting rolls 302, and the temperature of the converged liquid metal is reduced, and the converged liquid metal starts to solidify at the region close to the surface of the casting rolls 302. As the casting rolls 302 continue to rotate, the solidifying metal is subjected to the rolling force between the two casting rolls 302 to be shaped into a metal strip.

[0137] The first region and the second region of the metal strip have different compositions, so that the tensile strength of the first region and the second region is different.

[0138] In some embodiments, the casting nozzle 301 comprises one first delivery chamber 101 and one second delivery chamber 102, and the metal strip formed thereby comprises one first region and one second region, and the first region and the second region are adjacent.

[0139] In some other embodiments, the casting nozzle 301 includes one first feeding chamber 101 and two second feeding chambers 102, with the two second feeding chambers 102 located on opposite sides of the first feeding chamber 101. Thus, the formed metal strip has one first region and two second regions, with the two second regions located on opposite sides of the first region.

[0140] The casting and rolling mill has the beneficial effects of the casting nozzle 301 provided in the embodiments of this application. For details, please refer to the specific description of the casting nozzle 301 in the above embodiments, which will not be repeated here.

[0141] like Figure 1 As shown, this application embodiment provides a current collector 24, which is prepared using the casting and rolling mill in the above embodiment. The current collector 24 includes: a main body region 241; and a tab region 242. The tab region 242 is located on at least one side of the main body region 241, and the tensile strength of the main body region 241 is greater than the tensile strength of the tab region 242.

[0142] Tensile strength refers to the maximum stress a material can withstand during tension, and it is usually determined through a tensile test. During the test, the main body region and the tab region of the current collector are mounted on a material testing machine. The machine applies axial tensile force to the main body region and the tab region at a certain speed, while simultaneously measuring the elongation of the main body region and the tab region using sensors such as strain gauges, and recording the stress-strain data. The unit of tensile strength can be MPa.

[0143] The main body region 241 may include a first metal, and the tab region 242 may include a second metal. In other words, the main body region 241 is the first region of the metal strip in the above embodiment, and the tab region 242 is the second region of the metal strip in the above embodiment. The method for preparing the current collector 24 using a casting and rolling mill is the same as the method for preparing the metal strip using a casting and rolling mill in the above embodiment, and will not be described again here.

[0144] For example, the first liquid metal can be molten aluminum, and the second liquid metal can be molten aluminum. Both the first and second molten aluminum may also contain Fe and Si components. By controlling the different Fe and Si contents in the first and second molten aluminum, the tensile strength of the main body region 241 and the tab region 242 can be adjusted. For example, the aluminum content of the first molten aluminum can be greater than 99.0%, the aluminum content of the second molten aluminum can be greater than 99.6%, the Fe content in the first molten aluminum is greater than the Fe content in the input second molten aluminum, and the Si content in the first molten aluminum is greater than the Si content in the input second molten aluminum. After the molten aluminum flows together, it is rolled by the casting roll 302 to form an aluminum foil. The aluminum foil includes a main body region 241 and a tab region 242. The main body region 241 contains the components of the first molten aluminum, and the tab region 242 contains the components of the second molten aluminum. This allows the tensile strength of the main body region 241 of the aluminum foil to be greater than the tensile strength of the tab region 242.

[0145] As an example, Table 1 below shows the tensile strength and elongation of the tab area 242 and the body area 241 and the experimental data related to the Fe and Si content. The Fe and Si content refers to the mass fraction.

[0146] Table 1

[0147]

[0148]

[0149] As shown in Table 1, four different current collectors 24 are shown as sample 1, sample 2, sample 3 and sample 4, each of which is prepared by the above-mentioned casting and rolling machine. In each sample, the Fe content of the body area 241 is greater than the Fe content of the tab area 242, and the Si content of the body area 241 is greater than the Si content of the tab area 242. The tensile strength of the body area 241 of each sample is greater than the tensile strength of the tab area 242, and the elongation of the tab area and the body area is not much different, and even the elongation of the tab area is greater than the elongation of the body area (as shown in sample 3 and sample 4). Thus, if the tab area is stretched to be consistent with the body area, the force applied to the tab area is less than the force applied to the body area. It can be seen that on the basis of controlling the different compositions of the first aluminum water and the second aluminum water, the tab area 242 and the body area 241 of the current collector 24 prepared by the above-mentioned casting and rolling machine have a strength difference. In the cold pressing process, the tab area does not need to be subjected to excessive tension, and the tab area can be stretched to be consistent with the body area, which can improve the problem of tab area fracture caused by excessive tension on the tab area.

[0150] The embodiment of the present application provides a battery monomer, the battery monomer comprising a tab, the tab comprising the current collector in the above-mentioned embodiment.

[0151] The structure of the battery monomer, the tab and the current collector can refer to the related description of the above-mentioned embodiment, which will not be repeated here.

[0152] The embodiment of the present application provides a battery, the battery comprising the battery monomer in the above-mentioned embodiment.

[0153] The structure of the battery and the battery monomer can refer to the related description of the above-mentioned embodiment, which will not be repeated here.

[0154] The battery can be used to provide electric energy for the electric device, and the electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft, and the like. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, and the like. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

[0155] The following embodiments are described by taking a vehicle 1000 as an example for convenience of description.

[0156] Please refer to Figure 10 , Figure 10 The vehicle structure diagram provided by some embodiments of the application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or an extended range automobile. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0157] In some embodiments of the application, the battery 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0158] The casting nozzle provided by the embodiments of the application, referring to Figure 7 and Figure 8 The casting nozzle includes a nozzle body, the nozzle body includes a first material conveying cavity 101 and a second material conveying cavity 102 which are independent of and adjacent to each other and located on both sides of the first material conveying cavity 101, and the feeding sides of the first material conveying cavity 101 and the second material conveying cavity 102 are communicated with a first feeding port 1 and a second feeding port 2 of the casting nozzle respectively; the nozzle body further includes a converging cavity 103 which is communicated with a discharging port 3 of the casting nozzle, and the converging cavity 103 is located at the discharging side of the first material conveying cavity 101 and the second material conveying cavity 102, and the converging cavity 103 is communicated with the first material conveying cavity 101 and the second material conveying cavity 102.

[0159] The discharging side of the first material conveying cavity 101 includes a first outlet, and the discharging side of the second material conveying cavity 102 includes a second outlet, the first outlet is adjacent to the second outlet, and the width of the first outlet is greater than the width of the second outlet along the arrangement direction of the first outlet and the second outlet.

[0160] The length of the runner cavity 103 is less than the length of the first material conveying cavity 101 and the length of the second material conveying cavity 102 in the material conveying direction of the runner cavity 103.

[0161] The nozzle body comprises a first part 31 and a second part 32, the first part 31 being combined with the second part 32 to jointly form the first material conveying cavity 101, the second material conveying cavity 102 and the runner cavity 103.

[0162] At least one of the first part 31 and the second part 32 comprises a recess structure 104, a wall portion on one side of the recess structure 104 in the second direction Y is provided with a first opening 41 and a second opening 42, the first opening 41 is used to form the first feeding port 1, the second opening 42 is used to form the second feeding port 2, the other side of the recess structure 104 in the second direction Y is an open structure as a whole, the open structure is used to form the discharging port 3, the second direction Y is perpendicular to the recess direction of the recess structure 104, wherein the recess structure 104 comprises a first area 104a and a second area 104b arranged along the second direction Y, the first area 104a is used to form the runner cavity 103. At least one of the first part 31 and the second part 32 further comprises at least one first blocking portion 105, the first blocking portion 105 is arranged in the second area 104b to separate the second area 104b into a first sub-area 1041 and a second sub-area 1042 which are independent of each other along a direction perpendicular to the second direction Y, wherein the first opening 41 is arranged in the first sub-area 1041, the second opening 42 is arranged in the second sub-area 1042, the first sub-area 1041 is used to form the first material conveying cavity 101, and the second sub-area 1042 is used to form the second material conveying cavity 102.

[0163] The recess depth of the recess structure 104 gradually decreases from the position away from the open structure to the position close to the open structure.

[0164] The nozzle further comprises a plurality of first flow blocking blocks 106 arranged in the first material conveying cavity 101, the plurality of first flow blocking blocks 106 are arranged in the first material conveying cavity 101 in a direction perpendicular to the material conveying direction of the first material conveying cavity 101 to define a plurality of first material conveying passages 61 in the first material conveying cavity 101, each first material conveying passage 61 is in communication with the first feeding port 1.

[0165] The nozzle further comprises at least one second flow blocking block 107 arranged in the second material conveying cavity 102, the at least one second flow blocking block 107 defines at least two second material conveying passages 62 in the second material conveying cavity 102, each second material conveying passage 62 is in communication with the second feeding port 2.

[0166] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A nozzle, characterized in that The application relates to a nozzle body comprising a first material conveying cavity and at least one second material conveying cavity which are independent of each other and adjacent to each other, the feeding sides of the first material conveying cavity and the second material conveying cavity are communicated with a first feeding port and a second feeding port of the nozzle respectively, and the nozzle body further comprises: a converging cavity which is communicated with a discharging port of the nozzle, the converging cavity is located at the discharging sides of the first material conveying cavity and the second material conveying cavity, and the converging cavity is communicated with the first material conveying cavity and the second material conveying cavity. The discharging side of the first material conveying cavity comprises a first outlet, the discharging side of the second material conveying cavity comprises a second outlet, the first outlet is adjacent to the second outlet, and the width of the first outlet is greater than the width of the second outlet along the arrangement direction of the first outlet and the second outlet. The ratio of the width of the first outlet to the width of the second outlet is 3-35 along the arrangement direction of the first outlet and the second outlet.

2. The nozzle of claim 1, wherein The length of the converging cavity is smaller than the length of the first material conveying cavity and the length of the second material conveying cavity along the material conveying direction of the converging cavity.

3. The nozzle of claim 2, wherein The nozzle body comprises a first part and a second part, the first part covers the second part to jointly form the first material conveying cavity, the second material conveying cavity and the converging cavity with the second part.

4. The nozzle of claim 1, wherein At least one of the first part and the second part comprises: a recess structure, a wall part of one side of the recess structure in a second direction is provided with a first opening and a second opening, the first opening is used for constituting the first feeding port, the second opening is used for constituting the second feeding port, the other side of the recess structure in the second direction is an open structure as a whole, the open structure is used for constituting the discharging port, the second direction is perpendicular to the recess direction of the recess structure, wherein the recess structure comprises a first area and a second area arranged along the second direction, the first area is used for constituting the converging cavity; 5. A nozzle according to any one of claims 1-4, characterized in that At least one first blocking part is arranged in the second area to separate the second area into a first subpart and a second subpart which are independent of each other along a direction perpendicular to the second direction, wherein the first opening is arranged in the first subpart, the second opening is arranged in the second subpart, the first subpart is used for constituting the first material conveying cavity, and the second subpart is used for constituting the second material conveying cavity.

6. The nozzle of claim 5, wherein One of the first part and the second part is provided with the recess structure and at least one first blocking part, and the surface of the other of the first part and the second part adjacent to the recess structure and the first blocking part is a plane. Both the first part and the second part are provided with the recess structure and at least one first blocking part, and the recess structures in the first part and the second part are arranged correspondingly, and the first blocking parts in the first part and the second part are arranged correspondingly, so as to jointly define the first material conveying cavity, the second material conveying cavity and the converging cavity. The recess depth of the recess structure gradually decreases from the side far away from the open structure to the side close to the open structure.

7. The nozzle of claim 6, wherein ​ 8. The nozzle of claim 6, wherein ​ 9. A nozzle according to any one of claims 6 to 8, characterised in that, ​ 10. The nozzle according to any one of claims 1-4, characterized in that The nozzle further comprises a plurality of first flow blocks arranged in the first material conveying cavity, the plurality of first flow blocks are arranged in intervals in a direction perpendicular to the first material conveying cavity to define a plurality of first material conveying channels in the first material conveying cavity, each of the first material conveying channels is in communication with the first material inlet.

11. The nozzle according to any one of claims 1-4, characterized in that The nozzle further comprises at least one second flow block arranged in the second material conveying cavity, the at least one second flow block defines at least two second material conveying channels in the second material conveying cavity, each of the second material conveying channels is in communication with the second material inlet.

12. A rolling mill, characterized by Comprising: The nozzle of any one of claims 1-11, the first material conveying cavity is used to convey a first metal liquid, the second material conveying cavity is used to convey a second metal liquid, the first metal liquid and the second metal liquid form a converged metal liquid via the converged cavity; A casting and rolling roller receives the converged metal liquid to form a metal strip comprising a first region and at least one second region, the first region comprises the first metal, the second region comprises the second metal.

13. A current collector characterized by comprising: Prepared by the casting and rolling machine of claim 12, the current collector comprises: A main region; A tab region, the tab region is located at least one side of the main region, the tensile strength of the main region is greater than the tensile strength of the tab region.

14. A battery cell, characterized by The battery monomer comprises a pole piece, the pole piece comprises: the current collector of claim 13.

15. A battery, characterized by Comprising: The battery monomer of claim 14.

Images