Filtering device, casting and rolling machine, current collector, battery monomer and battery

Abstract

The utility model provides a filtering device, a casting and rolling machine, a current collector, a battery monomer and a battery, and belongs to the technical field of filtering. The filtering device comprises a plurality of filtering parts, each filtering part is provided with an inlet allowing to-be-filtered liquid to flow in and an outlet allowing to-be-filtered liquid to flow out, the filtering parts are sequentially communicated, and the height positions of the inlets of the filtering parts are sequentially reduced in the gravity direction, so that the to-be-filtered liquid is sequentially filtered by the filtering parts under the gravity effect. The filtering device provided by the utility model can improve the filtering efficiency of the to-be-filtered liquid.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filtration, in particular to a filter device, a casting and rolling machine, a current collector, a battery monomer and a battery. BACKGROUND

[0002] The filtration technology is a process of purifying fluid, which can make the fluid pass through the filter material, and the solid particles and other substances in the fluid are intercepted by the filter material, so as to separate the solid and other substances from the fluid. For example, when the current collector of the battery is prepared, the raw material for forming the current collector needs to be filtered to remove impurities in the raw material and improve the pinhole problem of the surface of the current collector.

[0003] However, the current filter device has low filtering efficiency, and when the filter device is applied to production, the production capacity and yield of the product are not high. CONTENT OF THE INVENTION

[0004] The present application aims to solve at least one of the technical problems in the background art. To this end, one object of the present application is to provide a filter device, a casting and rolling machine, a current collector, a battery monomer and a battery to improve the problem of low filtering efficiency of the filter device.

[0005] An embodiment of the first aspect of the present application provides a filter device, comprising: a plurality of filter components, the filter component having an inlet for the liquid to be filtered to flow in and an outlet to flow out, the plurality of filter components being sequentially communicated, and the height positions of the inlets of the plurality of filter components in the gravity direction being sequentially reduced, so that the liquid to be filtered is sequentially filtered through the plurality of filter components under the action of gravity.

[0006] In the technical solution of the embodiment of the present application, the liquid to be filtered does not need to rely on external force, but relies on the static pressure generated by its own gravity to realize multiple filtering. In this way, the passing efficiency of the liquid to be filtered in the plurality of filter components is high, and the plurality of filter components filters the liquid to be filtered multiple times to achieve a better filtering effect, thereby improving the filtering efficiency of the liquid to be filtered as a whole.

[0007] In some embodiments, among the plurality of filter components, the filter component located at the head is referred to as the first filter component, the filter component connected with the first filter component is referred to as the second filter component, and the filtering precision of the first filter component is less than that of the second filter component. After the liquid to be filtered passes through the first filter component, coarse filtration is realized, and then fine filtration is realized through the second filter component with higher filtering precision, so as to improve the filtering effect of the liquid to be filtered.

[0008] In some embodiments, the plurality of filtering components further comprises at least one third filtering component, one of the at least one third filtering component is connected with the second filtering component, and the filtering precision of the second filtering component is equal to the filtering precision of the third filtering component. That is, the filtering precision of the remaining filtering components other than the first filtering component and the second filtering component is as high as the second filtering component, so that the remaining filtering components can perform re-filtration on the to-be-filtered liquid after the to-be-filtered liquid flows out of the second filtering component, and the remaining impurities in the to-be-filtered liquid can be further removed. Moreover, compared with setting the filtering precision of the remaining filtering components to be higher than the second filtering component, setting the filtering precision of the remaining filtering components to be equal to the second filtering component can not only make the remaining filtering components have higher filtering precision, but also can not make the filtering precision of the remaining components too high to affect the flow rate of the to-be-filtered liquid, thereby improving the production efficiency.

[0009] In some embodiments, the filtering component comprises a filtering cavity connected with the inlet and the outlet of the filtering component, and the filtering cavity is provided with a filtering structure. The inlet and the outlet are located on the two sides of the filtering structure in the direction of gravity, and the filtering structure is used for filtering the to-be-filtered liquid. In this way, after the to-be-filtered liquid enters the filtering cavity from the inlet, the to-be-filtered liquid is filtered by the filtering structure under the action of its own gravity and flows out of the outlet, thereby realizing filtering while having a high flow efficiency, and improving the filtering efficiency.

[0010] In some embodiments, the filtering structure comprises a plurality of filtering pieces arranged at intervals in the direction of gravity. In this way, the to-be-filtered liquid can pass through the plurality of filtering pieces in the flow process, so that the plurality of filtering pieces perform multiple filtering on the to-be-filtered liquid, thereby improving the filtering effect.

[0011] In some embodiments, the filtering piece is a filtering screen. The filtering screen not only has good filtering effect, but also is easy to replace, and can maintain high filtering efficiency of the filtering structure.

[0012] In some embodiments, the filtering component located at the head is referred to as the first filtering component, the filtering component connected with the first filtering component is referred to as the second filtering component, and the mesh number of the filtering screen of the first filtering component is less than the mesh number of the filtering screen of the second filtering component. By designing the mesh number of the filtering screen, the filtering precision of the second filtering component is greater than the filtering precision of the first filtering component, thereby realizing coarse filtering and fine filtering of the to-be-filtered liquid.

[0013] In some embodiments, when the plurality of filtering components further comprises at least one third filtering component, the mesh number of the filtering screen of the second filtering component is equal to the mesh number of the filtering screen of the third filtering component. In this way, the filtering precision of the remaining filtering components is as high as the filtering precision of the second filtering component, thereby realizing multiple fine filtering of the to-be-filtered liquid and improving the filtering effect.

[0014] In some embodiments, the filtering device further comprises a heating element configured to heat the filtering cavity. In this way, the temperature of the filtering cavity is relatively high, and the liquid to be filtered can be kept warm during the filtering process, and the liquid to be filtered can flow more easily, thereby improving the passing efficiency of the liquid to be filtered.

[0015] In some embodiments, the heating element is a resistance wire, and the resistance wire is spirally wound around the outer periphery of the filtering cavity. In this way, the filtering cavity can be uniformly heated, and the temperature in the filtering cavity is uniform, so that the liquid to be filtered flowing through the filtering cavity has a high passing efficiency throughout.

[0016] Embodiments of the second aspect of the present application provide a casting mill, which comprises the filtering device in the above embodiments, configured to filter the liquid metal; and a casting roll configured to receive the filtered liquid metal to form a metal strip. The filtering device in the above embodiments has a high filtering efficiency, which improves the removal effect of impurities in the liquid metal, thereby greatly reducing the pinhole density of the metal strip.

[0017] In some embodiments, the casting mill further comprises a conventional filtering device, wherein the filtering precision of the conventional filtering device is less than the filtering precision of the filtering device, the conventional filtering device is configured to filter a first liquid metal, and the filtering device is configured to filter a second liquid metal; and the casting roll is configured to receive the first liquid metal and the second liquid metal to form a metal strip comprising a first region and a second region, the first region comprising a first metal, and the second region comprising a second metal. In this way, the metal strip with different pinhole densities can be formed.

[0018] Embodiments of the third aspect of the present application provide a current collector prepared by the casting mill in the above embodiments, which comprises a main body region and a tab region, the tab region being located on at least one side of the main body region, and the pinhole density of the tab region being less than the pinhole density of the main body region. In this way, the pinhole density of the tab region is relatively small, which improves the strength of the tab region, and the problem that the tab region is prone to breaking during cold pressing treatment of the current collector can be improved.

[0019] Embodiments of the fourth aspect of the present application provide a battery cell, which comprises a tab, and the tab comprises the current collector in the above embodiments.

[0020] Embodiments of the fifth aspect of the present application provide a battery, which comprises the tab in the above embodiments.

[0021] 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

[0022] In the drawings, like reference numerals refer to like elements throughout the various figures. The drawings are not necessarily to scale, and the emphasis is on the functional relationships between elements. It should be understood that these drawings are merely depictions of some embodiments disclosed herein and that they should not be construed as limiting the scope of the disclosure.

[0023] Figure 1 Exploded view of a battery according to some embodiments of the present application;

[0024] Figure 2 Exploded view of a battery cell according to some embodiments of the present application;

[0025] Figure 3 Front view of a filter device according to some embodiments of the present application;

[0026] Figure 4 Perspective view of a filter component according to some embodiments of the present application;

[0027] Figure 5 Sectional view of a filter component according to some embodiments of the present application;

[0028] Figure 6 View of a filter according to some embodiments of the present application;

[0029] Figure 7 View of a resistance wire spirally wound around the periphery of a filter cavity according to some embodiments of the present application;

[0030] Figure 8 System diagram of a casting mill according to some embodiments of the present application;

[0031] Figure 9 View of a vehicle according to some embodiments of the present application.

[0032] Legend of reference numerals:

[0033] Vehicle 1000, filter cavity 1011, accommodation cavity 1012;

[0034] Battery 100, filter component 101, heating element 102;

[0035] Controller 200, filter device 201, casting nozzle 202, casting roll 203, smelting furnace 204, holding furnace 205, forehearth 206;

[0036] Motor 300;

[0037] Casing 10, first portion 11, second portion 12;

[0038] Battery cell 20, end cap 21, electrode terminal 21a, casing 22, electrode assembly 23, tab 23a;

[0039] inlet 31, outlet 32, first opening 33, second opening 34;

[0040] inlet pipe 41, outlet pipe 42;

[0041] outer housing 51, inner housing 52;

[0042] filtering member 60;

[0043] gravity direction G. DETAILED DESCRIPTION

[0044] The embodiments of the present application will be described in detail below with reference to the drawings. The following examples are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0045] 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 the present application; the terms "comprising" and "having", and any variations thereof, as used in the specification and claims and the aforementioned description of the drawings, are intended to cover not exclusive inclusion.

[0046] 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 "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0047] 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 present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship between 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 " / " in this paper generally represents a "or" relationship between the associated objects.

[0049] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0050] 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 shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0051] 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 broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0052] The filtering technology is a process of purifying fluid. The filtering technology can be applied in various fields. Taking the field of battery technology as an example, the filtering technology can be used to filter the raw material for forming the current collector, so as to reduce the pinhole density of the current collector.

[0053] Exemplarily, the current collector can be an aluminum foil, which can be formed by a cast rolling process on an aluminum ingot. The aluminum ingot has impurities such as oxides and slag. In the rolling process, the aluminum ingot needs to be melted to form aluminum water to facilitate shaping. After the aluminum ingot is melted to form aluminum water, the impurities in the aluminum ingot will not be melted. These impurities will fall off during the rolling process, forming pinholes on the surface of the aluminum foil. If the pinholes appear in large quantities in the tab area, it will cause serious belt breakage during the cold pressing process. Therefore, when preparing the current collector of the battery, the metal liquid for forming the current collector is filtered.

[0054] However, due to the poor filtering efficiency of the current filtering device, the yield and production capacity of the current collector are low.

[0055] Based on the above considerations, a filtering device is designed. The filtering device comprises a plurality of filtering components connected in sequence. The height positions of the inlets of the plurality of filtering components in the gravity direction are sequentially reduced, so that the liquid to be filtered is sequentially filtered by the plurality of filtering components under the action of gravity.

[0056] The liquid to be filtered does not rely on external force, but on the static pressure generated by its own gravity to achieve multiple filtrations. In this way, the liquid to be filtered passes through multiple filtration components with high efficiency, and multiple filtration components filter the liquid to be filtered multiple times to achieve a better filtration effect, thus improving the overall filtration efficiency of the liquid to be filtered.

[0057] The filtration device disclosed in this application can be used, but is not limited to, in the fields of wastewater treatment, food and beverage industry, or battery technology.

[0058] Taking the application of filtration devices in the field of battery technology as an example, filtration devices may include, but are not limited to, the production process of current collectors used in the battery production process.

[0059] Please refer to Figure 1 , Figure 1 This is an exploded structural diagram of a battery provided in some embodiments of this application. The battery 100 may include a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20, and the housing 10 may employ various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, and together define a space for accommodating the battery cell 20.

[0060] In battery 100, there can be multiple battery cells 20, which can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells 20 are connected in both series and parallel. Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0061] Please refer to Figure 2 , Figure 2 This is an exploded structural diagram of a battery cell provided in some embodiments of this application. The battery cell 20 refers to the smallest unit that makes up the battery. For example... Figure 2 The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0062] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. Functional components such as electrode terminals 21a may be provided on end cap 21. Electrode terminals 21a can be used to electrically connect with electrode assembly 23 for outputting or inputting electrical energy of battery cell 20.

[0063] The case 22 is an assembly for fitting the end cover 21 to form an internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, electrolyte and other components.

[0064] 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 stacking the electrode sheet. The electrode sheet 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 electrode sheet includes a current collector and an active material covering part of the surface of the current collector, wherein the part of the electrode sheet having the active material constitutes a main body of the electrode assembly, and the part of the electrode sheet not having the active material constitutes a tab 23a. In the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 23a is connected to the electrode terminal to form a current loop.

[0065] The material of the current collector can be a metal material, and the current collector can include, but is not limited to, a copper foil, an aluminum foil, etc.

[0066] Reference Figure 3 And Figure 4 The embodiment of the present application provides a filtering device, comprising: a plurality of filtering components 101, the filtering component 101 has an inlet 31 for the liquid to be filtered to flow in and an outlet 32 for the filtered liquid to flow out, the plurality of filtering components 101 are sequentially communicated, and the height positions of the inlets 31 of the plurality of filtering components 101 in the gravity direction G are sequentially reduced, so that the liquid to be filtered can be sequentially filtered by the plurality of filtering components 101 under the action of gravity.

[0067] In the plurality of sequentially communicated filtering components 101, the outlet 32 of the previous filtering component 101 is connected to the inlet 31 of the subsequent filtering component 101, so that the liquid to be filtered can flow through the plurality of filtering components 101 sequentially. In the gravity direction G, the height position of the outlet 32 of the filtering component 101 is lower than the height position of the inlet 31, so that the liquid to be filtered can flow into the inlet 31 of the filtering component 101 and flow out of the outlet 32 under the action of gravity, so that the liquid to be filtered can flow through the filtering component 101 smoothly without using external power during the filtering process. The height position of the outlet 32 of the previous filtering component 101 can be not lower than the height position of the inlet 31 of the subsequent filtering component 101, which is beneficial to the flow of the liquid to be filtered from the previous filtering component 101 to the subsequent filtering component. Exemplarily, the height position of the outlet 32 of the previous filtering component 101 can be equal to the height position of the inlet 31 of the subsequent filtering component 101.

[0068] In some embodiments, the outlet 32 of the former filter component 101 and the inlet 31 of the latter filter component 101 can be communicated through a pipe structure. Exemplarily, the outlet 32 of the filter component 101 is connected to an outlet pipe 42, the inlet 31 of the filter component 101 is connected to an inlet pipe 41, and the outlet pipe 42 of the former filter component 101 and the inlet pipe 41 of the latter filter component 101 can be communicated through a connecting flange. The liquid to be filtered can flow from the inlet pipe 41 of the first filter component 101, sequentially flow through the plurality of filter components 101, and then flow out from the outlet pipe 42 of the last filter component 101.

[0069] The number of the plurality of filter components 101 can be 2, 3, 4, or more.

[0070] The filter component 101 can comprise a filter structure for filtering the liquid to be filtered, which can include but is not limited to a mesh filter structure, a wire gap filter structure, a paper filter structure, or a filter core filter structure, etc.

[0071] In some embodiments, the filter device can further comprise a support frame for supporting each filter component 101 so that the plurality of filter components 101 maintain a height difference therebetween.

[0072] In the above technical solution, the inlets 31 of the plurality of filter components 101 have a height difference in the direction of gravity G, so that the liquid to be filtered can sequentially flow through the plurality of filter components 101 under the action of gravity for multi-stage filtration. That is, the liquid to be filtered does not need to rely on external force, but relies on the static pressure generated by its own gravity to achieve multi-stage filtration, which can improve the filtration efficiency of the liquid to be filtered.

[0073] According to some embodiments of the present application, among the plurality of filter components 101, the filter component 101 located at the head is referred to as the first filter component, the filter component 101 connected to the first filter component is referred to as the second filter component, and the filtration precision of the first filter component is less than that of the second filter component.

[0074] The filtration precision refers to the size of the smallest solid particles that can be effectively filtered out by the filter component 101. For spherical solid particles, the size can be the diameter. For irregularly shaped solid particles, the equivalent particle size can be used to measure the size, for example, the projection diameter or the Stokes diameter can be used as the equivalent particle size. The methods for obtaining the projection diameter and the Stokes diameter are well known to those skilled in the art, and will not be described here.

[0075] It can be understood that the greater the filtration precision, the smaller the size of the smallest solid particles that can be effectively filtered out, and the greater the filtration efficiency, so that the impurities after filtration are less.

[0076] The first filter component 101 in the plurality of filter components 101 is located at the head. The first filter component has a relatively low filtering precision, and can filter relatively large particles in the liquid to be filtered, thereby achieving coarse filtration of the liquid to be filtered. The second filter component has a relatively high filtering precision, and can filter relatively small particles in the liquid to be filtered, thereby achieving fine filtration of the liquid to be filtered.

[0077] In the above technical solution, after the liquid to be filtered passes through the first filter component, coarse filtration is achieved, and then the liquid to be filtered passes through the second filter component with a higher filtering precision, thereby improving the filtering effect of the liquid to be filtered.

[0078] According to some embodiments of the present application, the plurality of filter components further includes at least one third filter component, one of the at least one third filter component is connected to the second filter component, and the filtering precision of the second filter component is equal to the filtering precision of the third filter component.

[0079] The remaining filter components in the plurality of filter components, except for the first filter component and the second filter component, can all be referred to as third filter components.

[0080] For example, the number of filter components 101 is 3, and the last filter component 101 in the plurality of filter components 101 is referred to as a third filter component. The filtering precision of the third filter component is the same as that of the second filter component.

[0081] The number of filter components 101 can also be greater than 3, and the number of third filter components can be multiple. The plurality of third filter components are sequentially connected, and the third filter component located at the head of the plurality of third filter components is connected to the second filter component.

[0082] It can be understood that the higher the filtering precision, the lower the rate of the liquid to be filtered passing through the filter component 101. Considering that when the filtering device is applied to an actual production process, it is necessary to maintain a high production efficiency, based on this, the filtering precision of the remaining filter components 101 in the plurality of filter components 101, except for the first filter component and the second filter component, is equal to the precision of the second filter component, which not only makes the third filter component have a high precision, but also makes the passing efficiency of the liquid to be filtered in the third filter component be relatively high.

[0083] In the technical solution, the filtering precision of the remaining filter components 101 except the first filter component and the second filter component is as high as that of the second filter component, so that the remaining filter components 101 can perform re-filtration on the to-be-filtered liquid after the to-be-filtered liquid flows out of the second filter component, and further remove the remaining impurities in the to-be-filtered liquid. In addition, compared with setting the filtering precision of the remaining filter components 101 to be higher than that of the second filter component, setting the filtering precision of the remaining filter components 101 to be equal to that of the second filter component can not only make the remaining filter components 101 have higher filtering precision, but also can not make the filtering precision of the remaining filter components too high to affect the flow rate of the to-be-filtered liquid, thereby improving the production efficiency.

[0084] It can be understood that in other embodiments, the filtering precision of the third filter component can also be different from that of the second filter component, and the filtering precision of the third filter component can be greater than that of the second filter component. In the case where the number of the third filter components is multiple, the filtering precisions of the multiple third filter components can also be different. For example, the filtering precisions of the multiple third filter components connected in sequence can increase in sequence.

[0085] Reference Figure 5 According to some embodiments of the present application, the filter component 101 comprises a filter cavity 1011 connected with the inlet 31 and the outlet 32 of the filter component 101, and the filter cavity 1011 is provided with a filter structure. The inlet 31 and the outlet 32 are located on two sides of the gravity direction G of the filter structure, and the filter structure is used for filtering the to-be-filtered liquid.

[0086] The filter structure can include but is not limited to one of a mesh filter structure, a wire gap filter structure, a paper filter structure, or a filter core filter structure.

[0087] In some embodiments, the line between the inlet 31 and the outlet 32 of the filter component 101 passes through the center line of the filter cavity 1011, so that the to-be-filtered liquid can cross the entire filter cavity 1011, so that the to-be-filtered liquid can flow through the filter structure to the maximum extent, thereby making the filter structure have a better filtering effect on the to-be-filtered liquid.

[0088] In some embodiments, the filtering component 101 can include an outer housing 51 and an inner housing 52, the outer housing 51 enclosing a receiving cavity 1012, the inner housing 52 being located in the outer housing 51, the inner housing 52 enclosing a filtering cavity 1011, the outer housing 51 being arranged around the outer periphery of the filtering cavity 1011. The top of the inner housing 52 can be connected to the top of the outer housing 51, and the inner housing 52 is suspended in the receiving cavity 1012. The inlet 31 and the outlet 32 of the filtering component 101 are arranged on the outer housing 51, the inner housing 52 is provided with a first opening 33 in communication with the inlet 31 and a second opening 34 in communication with the outlet 32, and the first opening 33 and the second opening 34 are both in communication with the filtering cavity 1011. The inlet 31 and the first opening 33 can be communicated through an inlet pipe 41, and the outlet 32 and the second opening 34 can be communicated through a second opening 34.

[0089] In some embodiments, the filtering component 101 can also include only one housing, which can enclose the filtering cavity 1011, and the housing is provided with the inlet 31 and the outlet 32.

[0090] The cross-sectional shape of the filtering cavity 1011 in the transverse direction perpendicular to the axial direction can be circular, elliptical, rectangular, or other polygonal shape.

[0091] In the above technical solution, after the liquid to be filtered enters the filtering cavity 1011 from the inlet 31, it is filtered by the filtering structure under the action of its own gravity and flows out from the outlet 32, achieving filtering while having a high flow efficiency, thereby improving the filtering efficiency.

[0092] Reference Figure 5 According to some embodiments of the present application, the filtering structure includes a plurality of filtering pieces 60 arranged at intervals in the direction of gravity G.

[0093] The filtering piece 60 can include but is not limited to any one of filtering cotton, filtering mesh, or filtering paper.

[0094] The filtering piece 60 is detachably mounted to the inner wall surface of the filtering cavity 1011, so that after the filtering piece 60 is used for multiple times, a new filtering piece 60 can be easily replaced. In some embodiments, the inner wall surface of the filtering cavity 1011 is provided with a plurality of mounting structures arranged at intervals in the direction of gravity G, and the filtering piece 60 is mounted to the inner wall surface of the filtering cavity 1011 through the mounting structures.

[0095] For example, the mounting structure can be a groove, and the filtering piece 60 can be detachably mounted to the inner wall surface of the filtering cavity 1011 through a clamping manner.

[0096] The number of the plurality of filtering pieces 60 can be 2, 3, 4, 5, or more.

[0097] In some embodiments, the number of filter pieces 60 in each filter component 101 can be the same. The filtering precision of the filter pieces 60 in the first filter component can be less than the filtering precision of the filter pieces 60 in the second filter component, and the filtering precision of the filter pieces 60 in the remaining filter components 101 can be the same as the filtering precision of the filter pieces 60 in the second filter component.

[0098] In some other embodiments, the filtering precision of the filter pieces 60 in each filter component 101 can be the same, the number of filter pieces 60 in the first filter component is less than the number of filter pieces 60 in the second filter component, and the number of filter pieces 60 in the remaining filter components 101 is the same as the number of filter pieces 60 in the second filter component, so that the filtering precision of the first filter component is less than the filtering precision of the second filter component, and the filtering precision of the remaining filter components 101 is the same as the filtering precision of the second filter component.

[0099] In the above technical solution, the to-be-filtered liquid can pass through multiple filter pieces 60 during the flow process, so that the multiple filter pieces 60 perform multiple filtering on the to-be-filtered liquid, thereby improving the filtering effect.

[0100] Reference Figure 6 According to some embodiments of the present application, the filter piece 60 is a filter screen.

[0101] The filter screen can include but is not limited to a metal filter screen, a fiber filter screen, or a ceramic filter screen, etc.

[0102] The filter screen can be a plate filter screen, which is convenient to install on the inner wall of the filter cavity 1011.

[0103] The shape of the filter screen can be adapted to the cross-sectional shape of the filter cavity 1011, so that the outer edge of the filter screen is in contact with the inner wall of the filter cavity 1011. In this way, the to-be-filtered liquid can flow through the filter screen no matter where it flows to the filter cavity 1011, thereby achieving efficient filtering.

[0104] In some embodiments, the number of filter screens in each filter component 101 can be 8, so that the filter component 101 has a good interception effect on impurities in the to-be-filtered liquid.

[0105] In the above technical solution, the filter screen not only has a good filtering effect, but also is easy to replace, thereby maintaining a high filtering efficiency of the filtering structure.

[0106] According to some embodiments of the present application, the filter component 101 located at the head is referred to as the first filter component, the filter component 101 connected to the first filter component is referred to as the second filter component, and the mesh number of the filter screen of the first filter component is less than the mesh number of the filter screen of the second filter component.

[0107] Exemplarily, the mesh number of the filter screen in the first filter component can be 50 mesh, and the mesh number of the filter screen in the second filter component can be 60 mesh. The mesh numbers of the plurality of filter screens in the same filter component 101 can be the same.

[0108] In the technical solution, the mesh number of the filter screen is designed so that the filtering precision of the second filter component is greater than the filtering precision of the first filter component, thereby achieving coarse filtering and fine filtering of the liquid to be filtered.

[0109] According to some embodiments of the present application, when the plurality of filter components further include at least one third filter component, the mesh number of the filter screen of the second filter component is equal to the mesh number of the filter screen of the third filter component.

[0110] Exemplarily, the mesh number of the filter screen in the third filter component 101 can be 60 mesh.

[0111] Experiments show that, when the number of filter components 101 is three, each filter component 101 is provided with 8 filter screens, the mesh number of the filter screen in the first filter component is 50 mesh, and the mesh number of the filter screen in the second filter component and the third filter component is 60 mesh, the impurities with a diameter greater than 5 μm in the liquid to be filtered can be filtered.

[0112] In the technical solution, the filtering precision of the remaining filter components 101 is as high as the filtering precision of the second filter component, thereby achieving multiple fine filtering of the liquid to be filtered and improving the filtering effect.

[0113] Reference Figure 5 According to some embodiments of the present application, the filtering device further includes a heating member 102 for heating the filter cavity 1011.

[0114] The filter component 101 can include an outer shell 51 and an inner shell 52. The outer shell 51 encloses a receiving cavity 1012, and the inner shell 52 is located in the receiving cavity 1012 and encloses a filter cavity 1011. The outer shell 51 surrounds the outer periphery of the inner shell 52. The heating member 102 is disposed between the outer shell 51 and the inner shell 52, and can be located on the surface of the inner shell 52 close to the outer shell 51 to heat the filter cavity 1011. In this way, the heating member 102 is placed in a relatively closed environment, reducing the heat loss generated by the heating member 102, and the heating member 102 has a good heating effect on the filter cavity 1011.

[0115] The heating member 102 includes at least one of a ceramic heating element, a heating tube, a heating coil, a resistance wire, a carbon fiber heating element, etc.

[0116] It can be understood that, in the case that the to-be-filtered liquid is a liquid that is prone to solidification at room temperature, if the filter cavity 1011 is not kept warm, the to-be-filtered liquid will gradually solidify, so that the flow rate of the to-be-filtered liquid is low, which is not conducive to the filtration of the to-be-filtered liquid.

[0117] In the technical solution, the heating element 102 is arranged to heat the filter cavity 1011, so that the temperature of the filter cavity 1011 is high. During the filtration process, the to-be-filtered liquid can be kept warm, the probability of solidification of the to-be-filtered liquid is reduced, the flow of the to-be-filtered liquid is promoted, and the through efficiency of the to-be-filtered liquid is improved.

[0118] Reference Figure 7 According to some embodiments of the present application, the heating element 102 is a resistance wire, and the resistance wire is spirally wound around the outer periphery of the filter cavity 1011.

[0119] The resistance wire is a metal wire with a certain resistance value. When an electric current passes through the resistance wire, due to the resistance effect of the resistance wire, electric energy will be converted into heat energy, thereby generating heat.

[0120] Exemplarily, the resistance wire can include but is not limited to one of a nickel-chromium alloy wire and an iron-chromium-aluminum alloy wire.

[0121] The resistance wire can be spirally wound around the outer periphery of the inner shell 52 surrounding the filter cavity 1011, so as to uniformly heat the filter cavity 1011.

[0122] In the technical solution, the filter cavity 1011 can be uniformly heated, so that the temperature in the filter cavity 1011 is uniform, and the to-be-filtered liquid flowing through the filter cavity 1011 has a high through efficiency throughout.

[0123] Reference Figure 8 The embodiment of the present application provides a casting and rolling machine, which comprises the filter device 201 in the above embodiment and is used for filtering a metal liquid; and a casting and rolling roller 203 is used for receiving the filtered metal liquid to form a metal strip.

[0124] The metal liquid can be obtained by melting a solid metal raw material. Exemplarily, the casting and rolling machine can comprise a melting furnace 204, and the melting furnace 204 melts the metal raw material to obtain the metal liquid.

[0125] The casting and rolling machine can further comprise an annealing furnace 205, and the annealing furnace 205 of the casting and rolling machine has the same meaning as that commonly understood by those skilled in the art. The annealing furnace 205 can refine the metal liquid, wherein the annealing furnace 205 further comprises a filter, and the filter can block solid impurities in the metal liquid, such as oxide impurities and slag, to preliminarily filter the metal liquid.

[0126] The filtering device 201 can be connected to the outlet of the holding furnace 205 to receive the metal liquid output from the holding furnace 205. For example, the inlet pipe of the filtering component at the head of the filtering device 201 can be connected to the outlet of the holding furnace 205. The principle of filtering the metal liquid by the filtering device 201 can refer to the related description of the above-mentioned embodiments, which will not be repeated here.

[0127] The casting and rolling machine can further include a forehearth 206, which has the same meaning as that commonly understood by those skilled in the art. The outlet pipe 42 of the filtering component 101 at the tail of the filtering device 201 can be connected to the liquid inlet tank of the forehearth 206, so that the metal liquid output from the filtering device 201 is input into the forehearth 206, and the forehearth 206 functions to buffer and regulate the flow of the metal liquid, so as to stabilize and continuously supply the metal liquid during the casting and rolling process. The liquid outlet tank of the forehearth 206 can be connected to the casting nozzle 202, and the metal liquid in the forehearth 206 flows out from the liquid outlet tank of the forehearth 206 and into the casting nozzle 202.

[0128] The casting and rolling machine can further include a casting nozzle 202, which has the same meaning as that commonly understood by those skilled in the art. The casting nozzle 202 is used to uniformly input the metal liquid from the forehearth 206 into the nip between the casting and rolling rolls 203, so that the metal liquid uniformly flows in the width direction of the casting and rolling rolls 203.

[0129] The casting and rolling rolls 203 have the same meaning as that commonly understood by those skilled in the art. The casting and rolling rolls 203 are internally cooled by cooling water, and the surface temperature is relatively low. When the metal liquid passes between the nips of the two casting and rolling rolls 203, the heat of the high-temperature metal liquid is quickly taken away by the casting and rolling rolls 203, and the temperature of the metal liquid is reduced, so that the metal liquid begins to solidify in the area close to the surface of the casting and rolling rolls 203. As the casting and rolling rolls 203 continuously rotate, the solidifying metal is subjected to the rolling force between the two casting and rolling rolls 203 to shape the metal into a metal strip.

[0130] The filtering device 201 in the above-mentioned embodiments has high filtering efficiency, which can greatly reduce the pinhole density of the metal strip.

[0131] According to some embodiments of the present application, the casting and rolling machine further includes a conventional filtering device 201, wherein the filtering precision of the conventional filtering device 201 is less than that of the filtering device 201, the conventional filtering device 201 is used to filter a first metal liquid, and the filtering device 201 is used to filter a second metal liquid; the casting and rolling rolls 203 are used to receive the first metal liquid and the second metal liquid to form a metal strip including a first region and a second region, the first region includes a first metal, and the second region includes a second metal.

[0132] The first metal and the second metal can be the same metal or different metals. When the first metal and the second metal are the same metal, the purity of the first metal and the purity of the second metal can be the same or different.

[0133] The conventional filtering device 201 can include a combination of plate filters and tube filters. The casting mill can include a plurality of melting furnaces 204, a plurality of holding furnaces 205, a plurality of casting nozzles 202, and a plurality of forehearth 206, one melting furnace 204 connected to one holding furnace 205. One of the melting furnaces 204 is used to melt the raw material of the first metal to form a first metal liquid, and the other melting furnaces 204 can melt the raw material of the second metal to form a second metal liquid. The first metal liquid and the second metal liquid enter different holding furnaces 205 respectively.

[0134] The filtering device 201 and the conventional filtering device 201 are respectively connected to the outlets of different holding furnaces 205 to respectively receive the first metal liquid and the second metal liquid. The filtering device 201 and the conventional filtering device 201 are respectively connected to the liquid inlet tanks of different forehearth 206, so that the filtered first metal liquid and the second metal liquid respectively enter different liquid inlet tanks. The liquid outlet tanks of different forehearth 206 are respectively connected to different casting nozzles 202, so that the first metal liquid and the second metal liquid are respectively input into different casting nozzles 202. The first metal liquid and the second metal liquid can be simultaneously output from the plurality of casting nozzles to the roll gap of the casting roll 203, and the first metal liquid and the second metal liquid can flow together in the roll gap of the casting roll 203.

[0135] In some embodiments, the number of melting furnaces, holding furnaces, casting nozzles, and forehearth is 2, and the filtering device and the conventional filtering device are respectively connected between different holding furnaces and casting nozzles, forming a metal strip including one first region and one second region located on one side of the first region.

[0136] In other embodiments, in some embodiments, the number of melting furnaces, holding furnaces, casting nozzles, and forehearth is 3, the number of filtering devices is 2, and the number of conventional filtering devices is 1. Two filtering devices are connected between two different holding furnaces and casting nozzles, and the conventional filtering device is connected between the remaining holding furnace and casting nozzle, forming a metal strip including one first region and two second regions located on both sides of the first region.

[0137] The metal strip can include but is not limited to a current collector, wherein the first region can be used as a main body region of the current collector, the second region can be used as a tab region of the current collector, and the active material is located on the surface of the main body region.

[0138] In the technical solution, the filtering precision of the filtering device 201 is different from that of the conventional filtering device 201, so that the impurities in the first molten metal are more than those in the second molten metal, and then the pinhole density of the first area is greater than that of the second area after the metal plate is formed, thereby forming a metal strip with different pinhole densities.

[0139] The application provides a current collector prepared by the casting and rolling machine in the above embodiment, which comprises a main body area and a tab area located on at least one side of the main body area, and the pinhole density of the tab area is less than that of the main body area.

[0140] The pinhole density refers to the number of pinholes per square meter of the current collector.

[0141] The material of the current collector is a metal material, for example, aluminum.

[0142] In some embodiments, the current collector can comprise a main body area and a tab area located on one side of the main body area. In other embodiments, the current collector can comprise a main body area and tab areas located on both sides of the main body area.

[0143] In some embodiments, the casting and rolling machine comprises a plurality of melting furnaces 204, a plurality of holding furnaces 205, a plurality of forehearth 206, the filtering device 201 in the above embodiment, the conventional filtering device 201, the casting nozzle 202 and the casting and rolling roller 203. The connection mode and working principle of the plurality of melting furnaces 204, the plurality of holding furnaces 205, the plurality of forehearth 206, the filtering device 201 and the conventional filtering device 201 can be referred to the related description of the above embodiment, which will not be described hereinafter.

[0144] In some embodiments, the material of the current collector is aluminum, wherein the aluminum used to form the main body area can be a first aluminum material, and the aluminum used to form the tab area can be a second aluminum material, and the purity of the first aluminum material is lower than that of the second aluminum material. For example, the purity of the first aluminum material reaches 99.6%, and the purity of the second aluminum material reaches 99.8%.

[0145] The melted first aluminum material and the second aluminum material are respectively input into different holding furnaces 205 for refining, and the refining degree of the second aluminum material can be higher than that of the second aluminum material, so that the pinhole density of the tab area of the formed current collector is further reduced.

[0146] After the melted first aluminum material and the second aluminum material flow out of the holding furnace 205, they are respectively input into the filtering device 201 and the conventional filtering device 201 for filtering, and then are sequentially input into the casting nozzle 202 and the casting and rolling roller 203, and finally form the current collector. The specific mode can be referred to the related description in the above embodiment, which will not be described hereinafter.

[0147] Due to the different filtering accuracies of the filtering device 201 and the conventional filtering device 201, the filtering accuracy of the first aluminum material is less than that of the second aluminum material, so that the impurities of the first aluminum material are more than those of the second aluminum material, and finally the pinhole density of the main body area is greater than that of the tab area in the current collector.

[0148] As an example, when the purity of the first aluminum material reaches 99.6% and the purity of the second aluminum material reaches 99.8%, the pinhole density of the tab area can be less than 0.02Ea / m 2 , and the diameter of the pinhole can be less than 100μm. The pinhole density of the main body area can be less than 1Ea / m 2 , and the diameter of the pinhole can be less than 2000μm. Wherein, Ea represents the number.

[0149] In the above technical solution, the pinhole density of the tab area is small, which improves the strength of the tab area, and can improve the problem that the tab area is prone to breakage during cold pressing of the current collector.

[0150] The battery monomer provided by the embodiment of the present application includes a pole piece, and the pole piece includes the current collector in the above embodiment.

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

[0152] The battery provided by the embodiment of the present application includes the battery monomer in the above embodiment.

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

[0154] The battery can be used to provide electric energy for the electric device, which can be but not limited to mobile phone, tablet, notebook computer, electric toy, electric tool, electric vehicle, electric car, ship, spacecraft, etc. 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, etc., and the spacecraft can include airplanes, rockets, space shuttles and spaceships, etc.

[0155] The following embodiments take a vehicle 1000 as an example for convenience of description.

[0156] Please refer to Figure 9 , Figure 9A structural schematic diagram of a vehicle is provided for some embodiments of the present 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 automobile or a range extended automobile, etc. 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 an 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 present application, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0158] The embodiment of the present application provides a filtering device 201, which comprises three filtering components 101, each filtering component 101 has an inlet 31 for flowing in of a to-be-filtered liquid and an outlet 32 for flowing out, a plurality of filtering components 101 are sequentially communicated, the outlet 32 of a previous filtering component 101 is connected to the inlet 31 of a subsequent filtering component 101, and the height position of the inlet 31 in each filtering component 101 is higher than the height of the outlet 32 in the gravity direction G, the height of the outlet 32 of the previous filtering component 101 is not lower than the height position of the inlet 31 of the subsequent filtering component 101, and the height positions of the inlets 31 of the plurality of filtering components 101 in the gravity direction G are sequentially reduced, so that the to-be-filtered liquid is sequentially filtered through the plurality of filtering components 101 under the action of gravity.

[0159] The outlet 32 of the filtering component 101 is connected to an outlet pipe 42, the inlet 31 of the filtering component 101 is connected to an inlet pipe 41, and the outlet pipe 42 of the previous filtering component 101 and the inlet pipe 41 of the subsequent filtering component 101 can be communicated through a connecting flange.

[0160] The filtering component 101 comprises a filtering cavity 1011, the filtering cavity 1011 is connected to the inlet 31 and the outlet 32 of the filtering component 101, a filtering structure is arranged in the filtering cavity 1011, the inlet 31 and the outlet 32 are located on two sides of the filtering structure in the gravity direction G, and the filtering structure is used for filtering the to-be-filtered liquid.

[0161] Exemplarily, the filtering component 101 can include an outer shell 51 and an inner shell 52, the outer shell 51 encloses a receiving cavity 1012, the inner shell 52 is located in the outer shell 51, the inner shell 52 encloses a filtering cavity 1011, and the outer shell 51 is arranged around the outer periphery of the filtering cavity 1011. The top of the inner shell 52 can be connected with the top of the outer shell 51, and the inner shell 52 is suspended in the receiving cavity 1012. The inlet 31 and the outlet 32 of the filtering component 101 are arranged on the outer shell 51, the inner shell 52 is provided with a first opening 33 corresponding to the inlet 31 and a second opening 34 corresponding to the outlet 32, and the first opening 33 and the second opening 34 are in communication with the filtering cavity 1011. The inlet 31 and the first opening 33 can be communicated through an inlet pipe 41, and the outlet 32 and the second opening 34 can be communicated through the second opening 34.

[0162] The filtering structure includes a plurality of filtering screens arranged in the direction of gravity G. Exemplarily, each filtering component 101 can have eight filtering screens. Among them, the three connected filtering components 101 are sequentially recorded as a first filtering component, a second filtering component and a third filtering component according to the connection order, the mesh number of the filtering screen of the first filtering component is less than the mesh number of the filtering screen of the second filtering component, and the mesh number of the filtering screen of the second filtering component is equal to the mesh number of the filtering screen of the third filtering component.

[0163] The filtering device 201 further includes a resistance wire, which is spirally wound around the outer periphery of the inner shell 52 enclosing the filtering cavity 1011, so as to heat the filtering cavity 1011.

[0164] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A filter device, characterized in that The filter device comprises: a plurality of filter components, each of which has an inlet for a liquid to be filtered to flow in and an outlet for the filtered liquid to flow out, the plurality of filter components are connected in series, and the height positions of the inlets of the plurality of filter components in the direction of gravity are sequentially reduced, so that the liquid to be filtered flows through the plurality of filter components in series under the action of gravity.

2. The filter device of claim 1, wherein, In the plurality of filter components, the filter component at the head is referred to as a first filter component, and the filter component connected to the first filter component is referred to as a second filter component, the filtering accuracy of the first filter component is lower than that of the second filter component.

3. The filter device of claim 2, wherein, The plurality of filter components further comprises at least one third filter component, one of the at least one third filter component is connected to the second filter component, and the filtering accuracy of the second filter component is equal to that of the third filter component.

4. The filter device according to any one of claims 1-3, characterized in that, The filter component comprises a filter cavity, the filter cavity is connected to the inlet and the outlet of the filter component, a filter structure is arranged in the filter cavity, the inlet and the outlet are located on the two sides of the filter structure in the direction of gravity, and the filter structure is used for filtering the liquid to be filtered.

5. The filter device of claim 4, wherein, The filter structure comprises a plurality of filter pieces arranged in the direction of gravity.

6. The filter device of claim 5, wherein, The filter piece is a filter screen.

7. The filter device of claim 6, wherein, The mesh number of the filter screen of the first filter component at the head is smaller than that of the filter screen of the second filter component connected to the first filter component.

8. The filter device of claim 7, wherein, In the case that the plurality of filter components further comprises at least one third filter component, the mesh number of the filter screen of the second filter component is equal to that of the filter screen of the third filter component.

9. The filter device according to any one of claims 5-8, characterized in that, The filter device further comprises: a heating element for heating the filter cavity.

10. The filter device of claim 9, wherein, The heating element is a resistance wire, and the resistance wire is spirally wound around the outer periphery of the filter cavity.

11. A casting mill, characterized by, The filter device comprises: The filter device according to any one of claims 1-10, used for filtering a metal liquid; a casting and rolling roller used for receiving the filtered metal liquid to form a metal strip.

12. The casting mill according to claim 11, characterized in that The casting and rolling machine further comprises: a conventional filter device, wherein the filtering accuracy of the conventional filter device is lower than that of the filter device, the conventional filter device is used for filtering a first metal liquid, and the filter device is used for filtering a second metal liquid; the casting and rolling roller is used for receiving the first metal liquid and the second metal liquid to form a metal strip comprising a first region and a second region, the first region comprises a first metal, and the second region comprises a second metal.

13. A current collector characterized by comprising: The current collector is prepared by using the casting and rolling machine according to claim 11 or 12, and the current collector comprises: a main body region; a tab region, the tab region is located on at least one side of the main body region, and the pinhole density of the tab region is lower than that of the main body region.

14. A battery cell, characterized by The battery cell comprises a tab, and the tab comprises the current collector according to claim 13.

15. A battery, characterized by The battery cell comprises: The battery cell according to claim 14.

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