CN218517536U - Foil shaping device, pole piece, battery monomer, battery and power utilization device - Google Patents

Abstract

The application provides a foil shaping device, pole piece, battery monomer, battery and power consumption device. The foil shaping device comprises a pressing mechanism and a preheating mechanism, the pressing mechanism comprises a first pressing component and a second pressing component, a first protruding part extending towards the second pressing component is arranged on the surface of the first pressing component, the first pressing component and the second pressing component extrude foil together, and an indentation is formed on the surface of the foil by matching with the first protruding part, the indentation improves the surface roughness of the foil, and during welding, a foil area with high surface roughness can generate higher welding heat, so that the welding quality among the foils is improved; preheating mechanism sets up in pressing mechanism's upper reaches for the foil that gets into pressing mechanism preheats, and the softened foil reduces the processing degree of difficulty of pressing mechanism to the material, improves foil shaping device's work efficiency, improves foil ductility, has reduced the risk that leads to the rosin joint because of the foil fracture when welding, has improved the welding quality between the foil, has improved battery life.

Description

Foil shaping device, pole piece, battery monomer, battery and power utilization device

Technical Field

The application relates to the field of batteries, in particular to a foil shaping device, a pole piece, a battery monomer, a battery and an electric device.

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry, and electric vehicles become important components of the sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in its development.

For a general battery cell, tab portions of a plurality of foils are welded together after being folded, the tabs are used for leading out the current of the battery to the outside, but the welding quality between the foils still needs to be improved.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the application provides a foil shaping device, pole piece, battery monomer, battery and power consumption device, can improve the foil, improves the connection reliability between the foil, improves battery life.

In a first aspect, the present application provides a foil shaping device comprising: the laminating mechanism comprises a first laminating assembly and a second laminating assembly which are oppositely arranged along a first direction, the first laminating assembly and the second laminating assembly are used for extruding foil, and the surface of the first laminating assembly is provided with at least one first protruding part facing the second laminating assembly; and the preheating mechanism is arranged at the upstream of the laminating mechanism and is used for heating the foil before the foil enters the laminating mechanism.

In the technical scheme of the embodiment of the application, the foil shaping device comprises a pressing mechanism, the pressing mechanism comprises a first pressing component and a second pressing component, a first protruding part extending towards the second pressing component is arranged on the surface of the first pressing component, the first pressing component and the second pressing component extrude foil together, and an indentation is formed on the surface of the foil by matching with the first protruding part, the indentation improves the surface roughness of the foil, and during welding, a foil area with high surface roughness can generate higher welding heat, so that the welding quality between the foils is improved, and the service life of a battery is prolonged; foil shaping device is still including preheating the mechanism, and preheating the mechanism setting is in the upper reaches of pressing mechanism for the foil that gets into pressing mechanism preheats, softens the foil, reduces the processing degree of difficulty of pressing mechanism to the material, improves foil shaping device's work efficiency, improves foil ductility, has reduced the risk that leads to the rosin joint because of the foil fracture when welding, has improved the welding quality between the foil, has improved the battery life-span.

In some embodiments, the surface of the second press component is provided with a recess corresponding to the first projection.

In the technical scheme of this application embodiment, the surface of second pressing components is provided with the depressed part that corresponds with first bulge, and the depressed part provides the space of dodging for the partial foil that is pushed out by the bulge, and the bulge and the depressed part of mutually supporting have reduced the impression degree of difficulty of foil, have reduced the risk of foil fracture.

In some embodiments, the pre-heating mechanism is at least one of a laser heater or an electromagnetic heater.

In the technical scheme of this application embodiment, preheat the mechanism and be at least one in laser heater or electromagnetic heater, preheat the mechanism and be used for preheating for the foil that gets into pressing mechanism, soften the foil, improve the problem of foil fracture, reduce the processing degree of difficulty of pressing mechanism to the material, improve foil shaping device's work efficiency.

In some embodiments, the surface of the second pressing component is provided with a second protrusion facing the first pressing component, and an orthographic projection of the first protrusion and an orthographic projection of the second protrusion are mutually staggered in the first direction.

In the technical scheme of this application embodiment, first bulge and the crisscross setting of second bulge, the foil of first bulge and the synchronous impression of second bulge has improved foil shaping device's work efficiency to the foil both sides all have the indentation, and during the welding, the heat production of friction further increases between two adjacent foils, has improved welding quality, has reduced the risk that rosin joint produced.

In some embodiments, the first pressing component comprises a first pressing surface for pressing the foil, and the first pressing surface is a plane or a curved surface; and/or the second pressing component comprises a second pressing surface which is used for matching with the first pressing component to press the foil, and the second pressing surface is a plane or a curved surface.

In the technical scheme of the embodiment of the application, when the first pressing surface and the second pressing surface are planes, the pressing force of the pressing mechanism is easy to adjust, the operation difficulty of the pressing mechanism is low, when the first pressing surface and the second pressing surface are curved, the pressing mechanism can continuously press foil, and the pressing efficiency is high.

In some embodiments, the first press-fit assembly includes a base and a press-fit portion detachably disposed on the base, and the first press-fit surface is disposed on a surface of the press-fit portion facing away from the base.

In the technical scheme of this application embodiment, first lamination assembly includes basal portion and nip, and basal portion and nip detachable connect, and first nip sets up on nip, can be connected with the basal portion through the nip that has different first nips, obtains the pressing mechanism who adapts to different service conditions, has improved this foil shaping device's practicality.

In some embodiments, the number of the first protrusions is multiple, and the multiple first protrusions are arranged in rows and columns on the first pressing assembly.

In the technical scheme of this application embodiment, a plurality of first bulge is arranged in line and column on first lamination assembly, and the foil atress is even, improves foil impression quality.

In some embodiments, a first heating module is disposed within the first lamination assembly and is configured to heat the first lamination assembly, and/or a second heating module is disposed within the second lamination assembly and is configured to heat the second lamination assembly.

In the technical scheme of this application embodiment, be provided with first heating module in the first lamination subassembly, first heating module is used for heating first lamination subassembly, heat the foil through first lamination subassembly, improve foil ductility and plasticity, reduce when the impression, lead to the risk of foil fracture because of the foil quench, and/or, be provided with the second heating module in the second lamination subassembly, the second heating module is used for heating second lamination subassembly, it improves foil ductility and plasticity to heat the foil through second lamination subassembly, reduce when the impression, lead to the risk of foil fracture because of the foil quench.

In some embodiments, the foil shaping device further comprises: the control mechanism is arranged on the pressing mechanism and used for changing the starting and stopping states of the pressing mechanism, the control mechanism comprises a transmitting device and a receiving device which are oppositely arranged along a first direction, the transmitting device is used for transmitting signals to the receiving device, and a gap for foil to pass through is formed between the transmitting device and the receiving device.

In the technical scheme of the embodiment of the application, the control mechanism is used for controlling the starting and stopping states of the pressing mechanism.

In some embodiments, the foil reshaping device further comprises: the adjusting mechanism is connected with the first pressing component and used for adjusting the distance between the first pressing component and the second pressing component in the first direction.

In the technical scheme of this application embodiment, guiding mechanism is used for controlling first lamination assembly in the first direction and the distance between second lamination assembly to adjustment lamination mechanism has improved this foil shaping device's practicality to the impression effect of foil.

In a second aspect, the present application provides a pole piece, including main part and utmost point ear, utmost point ear has the multilayer, and utmost point ear is stretched out by the main part, is provided with the knurling district on the utmost point ear, and multilayer utmost point ear is connected in the knurling district.

In the scheme of this application embodiment, the pole piece includes the main part and the multilayer utmost point ear that stretches out from the main part, is provided with the knurling district on the utmost point ear, and the knurling district has improved the surperficial roughness and the heat conductivility of utmost point ear, and multilayer utmost point ear is connected in the knurling district, and during welding operation, the friction heat production is more in the knurling district, and the knurling district produces the heat molten metal that can be many, improves the welding compatibility of two adjacent utmost point ears, improves utmost point ear welding quality, improves the battery performance.

In some embodiments, the pole piece is made of one of stainless steel, copper alloy, aluminum alloy, nickel alloy, iron, titanium and titanium alloy.

In some embodiments, in the thickness direction of the tab, one side of the embossed area of the tab is a groove, and the other side of the embossed area of the tab is provided with a convex hull corresponding to the groove.

In the technical scheme of this application embodiment, the both sides in the knurling district of utmost point ear are provided with the protruding closure that the recess corresponds respectively, have improved the roughness in knurling district, have improved the welding quality of utmost point ear.

In a third aspect, an embodiment of the present application provides a battery cell, including the pole piece provided in any one of the embodiments of the second aspect.

In a fourth aspect, an embodiment of the present application provides a battery, including the battery cell provided in any one of the embodiments of the third aspect.

In a fifth aspect, an embodiment of the present application provides an electrical device, including the battery provided in any one of the embodiments of the fourth aspect, where the battery is used to provide electrical energy.

Drawings

Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of a battery module according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a battery module according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a battery cell according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a foil shaping device according to an embodiment of the present application;

FIG. 6 isbase:Sub>A cross-sectional view A-A ofbase:Sub>A foil shaping device according to an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a foil shaping device according to another embodiment of the present disclosure;

FIG. 8 is a cross-sectional view B-B of a foil shaping device according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a pressing mechanism of a foil shaping device according to another embodiment of the present application;

FIG. 10 is a cross-sectional view at C-C of a foil shaping device according to another embodiment of the present application;

fig. 11 is a schematic structural diagram of a foil shaping device according to an embodiment of the present application;

FIG. 12 is a schematic structural diagram of a pole piece according to an embodiment of the present disclosure;

fig. 13 is a schematic view of a tab structure of a pole piece provided in an embodiment of the present application;

fig. 14 is a schematic view of a tab structure of a pole piece provided in another embodiment of the present application;

fig. 15 is a schematic view of a tab structure of a pole piece provided in accordance with yet another embodiment of the present application;

fig. 16 is a schematic view of a tab structure of a pole piece provided in accordance with yet another embodiment of the present application;

fig. 17 is a cross-sectional view taken at D-D in fig. 13.

The reference numbers in the detailed description are as follows:

1, a vehicle; 2, a battery; 101 a motor; 102 a controller; 202, a box body; 2021 a first tank portion; 2022 a second tank portion; 201 a battery module; 3, a single battery; 4, a shell;

5 an electrode assembly; 51 a main body part; 52, pole lugs; 53 pole pieces; 54 an embossed area; 541 a groove; 542 convex hull; 6, a top cover component; 61 electrode terminals;

7 foil shaping device; 71 a pressing mechanism; 72 a first pressing component; 73 a second pressing assembly; 721 a first projection; 731 a recess; 732 a second projection; 722 a first press fit surface; 733 a second laminating surface; 723 a base portion; 724 a press-fit part; 725 a first heating module; 734 a second heating module; 74 a preheating mechanism; 75 a control mechanism; 751 an emitting device; 752 receiver device; 76 adjusting the mechanism.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

It should be noted that technical terms or scientific terms used in the embodiments of the present application should be understood as having a common meaning as understood by those skilled in the art to which the embodiments of the present application belong, unless otherwise specified.

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations and positional relationships that are based on the orientations and positional relationships shown in the drawings, and are used only for convenience in describing the embodiments of the present application and for simplicity in description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the embodiments of the present application.

Furthermore, the technical terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description of the embodiments of the present application, "upstream" and "downstream" refer to the production sequence in succession, upstream refers to the production sequence first, and downstream refers to the production sequence later, without limiting the spatial position between the components.

At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles and electric automobiles, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding.

In this application, the battery cell may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, and the embodiment of the present application is not limited thereto. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application.

Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charging or discharging of battery monomer.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive pole piece, a negative pole piece and a separator. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece comprises a positive foil and a positive active substance layer, and the positive active substance layer is coated on the surface of the positive foil; the positive foil comprises a positive current collecting part and a positive electrode lug connected to the positive current collecting part, wherein the positive current collecting part is coated with a positive active substance layer, and the positive electrode lug is not coated with the positive active substance layer. Taking a lithium ion battery as an example, the material of the positive foil may be aluminum or stainless steel, the positive active material layer includes a positive active material, and the positive active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece comprises a negative pole foil and a negative pole active substance layer, and the negative pole active substance layer is coated on the surface of the negative pole foil; the negative foil comprises a negative current collecting part and a negative electrode lug connected to the negative current collecting part, wherein the negative current collecting part is coated with a negative electrode active substance layer, and the negative electrode lug is not coated with the negative electrode active substance layer. The material of the negative electrode foil may be copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon, silicon, or the like. The material of the spacer may be PP (polypropylene) or PE (polyethylene).

The inventors of the present application have noted that the service life of some batteries does not meet standards.

The inventor of the application disassembles the battery, disassembles the battery monomer in the battery, and analyzes and researches the structure and the service environment of the battery monomer. The inventor finds that the contact between the multiple layers of tabs in part of the battery cells is poor. Further research shows that in the manufacturing process of the battery monomer, multiple layers of tabs need to be folded and welded together, and with the diversification of design, high-strength metal (such as stainless steel) is gradually and generally used as a pole piece foil, but the welding difficulty between the high-strength metal tabs is high. When ultrasonic bonding multilayer utmost point ear, because utmost point ear surface is smooth, lead to utmost point ear and electrode to draw out friction heat production between the piece and be not enough fine melting high strength metal utmost point ear, increased the risk that rosin joint produced.

Based on the problems discovered by the inventor, the inventor designs a foil shaping device which comprises a pressing mechanism, wherein the pressing mechanism comprises a first pressing component and a second pressing component, a first protruding part extending towards the second pressing component is arranged on the surface of the first pressing component, the first pressing component and the second pressing component extrude foil together, and meanwhile, an indentation is formed on the surface of the foil by matching with the first protruding part, the indentation improves the surface roughness of the foil, and during welding, a foil area with high surface roughness can generate higher welding heat, so that the welding quality among the foils is improved, and the service life of a battery is prolonged; foil shaping device is still including preheating the mechanism, and preheating the mechanism setting is in one side of pressing mechanism for the foil that gets into pressing mechanism preheats, softens the foil, reduces the processing degree of difficulty of pressing mechanism to the material, improves foil shaping device's work efficiency, improves foil ductility, has reduced the risk that leads to the rosin joint because of the foil fracture when welding, has improved the welding quality between the foil, has improved the battery life-span.

The technical scheme described in the embodiment of the application is suitable for the battery and the electric device using the battery.

The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The vehicle can be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; the electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and electric tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above power utilization device.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to be applied to the above-described battery and electric equipment, but may be applied to all batteries including a box and electric equipment using the battery.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1 according to some embodiments of the present disclosure. The vehicle 1 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 a range-extended automobile and the like. The interior of the vehicle 1 is provided with a battery 2, which may be arranged at the bottom or at the head or tail of the vehicle 1. The battery 2 may be used for power supply of the vehicle 1, and for example, the battery 2 may serve as an operation power source of the vehicle 1. The vehicle 1 may further comprise a controller 102 and a motor 101, the controller 102 being arranged to control a battery to power the motor 101, e.g. for start-up, navigation and operational power demands while driving of the vehicle 1.

In some embodiments of the present application, the battery may be used not only as an operating power source of the vehicle 1, but also as a driving power source of the vehicle 1, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1.

In order to meet different power requirements, the battery 2 may include a plurality of battery cells, which are the smallest units constituting a battery module or a battery pack. A plurality of battery cells may be connected in series and/or in parallel via electrode terminals to be applied to various applications. The battery 2 referred to in the present application includes a battery module or a battery pack. The plurality of battery cells can be connected in series or in parallel or in series-parallel, and the series-parallel refers to the mixture of series connection and parallel connection. In the embodiment of the application, a plurality of battery monomers can directly form the battery pack, or the battery module can be formed firstly, and then the battery pack is formed by the battery module.

Fig. 2 shows a schematic structural diagram of a battery 2 according to an embodiment of the present application.

As shown in fig. 2, the battery includes a case 202 and a battery cell (not shown), and the battery cell is accommodated in the case 202.

The box 202 may be a single cuboid, a cylinder, a sphere, or other simple three-dimensional structure, or may be a complex three-dimensional structure formed by combining cuboid, cylinder, or sphere, and other simple three-dimensional structures. The material of the box 202 may be an alloy material such as aluminum alloy and iron alloy, a polymer material such as polycarbonate and polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

The case 202 is used for accommodating the battery cells, and the case 202 may have various structures. In some embodiments, the case 202 may include a first case portion 2021 and a second case portion 2022, the first case portion 2021 and the second case portion 2022 cover each other, and the first case portion 2021 and the second case portion 2022 together define a receiving space for receiving the battery cell 3. The second box part 2022 may be a hollow structure with an open end, the first box part 2021 is a plate-shaped structure, and the first box part 2021 covers the open side of the second box part 2022 to form the box 202 with an accommodating space; the first case portion 2021 and the second case portion 2022 may be both hollow structures with one side open, and the open side of the first case portion 2021 covers the open side of the second case portion 2022 to form a case 202 having an accommodating space. Of course, the first case portion 2021 and the second case portion 2022 may be various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In order to improve the sealing property after the first case portion 2021 and the second case portion 2022 are connected, a sealing member, such as a sealant or a gasket, may be provided between the first case portion 2021 and the second case portion 2022.

Assuming that the first box portion 2021 covers the top of the second box portion 2022, the first box portion 2021 may also be referred to as an upper box cover, and the second box portion 2022 may also be referred to as a lower box cover.

In the battery 2, one or more battery cells may be provided. If the number of the battery monomers is multiple, the multiple battery monomers can be connected in series or in parallel or in series-parallel, and the series-parallel refers to that the multiple battery monomers are connected in series or in parallel. The plurality of battery cells can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery cells is accommodated in the box body 202; of course, a plurality of battery cells may be connected in series or in parallel or in series-parallel to form the battery module 201, and a plurality of battery modules 201 may be connected in series or in parallel or in series-parallel to form a whole and accommodated in the box 202.

Fig. 3 shows a schematic structural diagram of a battery module 201 according to an embodiment of the present application.

In some embodiments, as shown in fig. 2 and 3, the battery unit 3 is multiple, and a plurality of battery units 3 are connected in series or in parallel or in series-parallel to form a battery module 201. A plurality of battery modules 201 are connected in series or in parallel or in series-parallel to form a whole, and are accommodated in the case 202.

The plurality of battery cells 3 in the battery module 201 may be electrically connected to each other by a bus member, so as to realize parallel connection, series connection or parallel connection of the plurality of battery cells 3 in the battery module 201.

In this application, the battery cell 3 may include a lithium ion battery cell 3, a sodium ion battery cell 3, a magnesium ion battery cell 3, or the like, which is not limited in this application. The battery cells 3 may be cylindrical, flat, rectangular or other shapes, which is not limited in the embodiments of the present application. The battery cells 3 are generally divided into three types in an encapsulated manner: the battery pack comprises a cylindrical battery monomer 3, a square battery monomer 3 and a soft package battery monomer 3, and the embodiment of the application is not limited to the above. However, for the sake of brevity, the following embodiments are described by taking the single cell 3 as an example.

Fig. 4 is a schematic structural diagram of a battery cell 3 according to some embodiments of the present disclosure. The battery cell 3 refers to the smallest unit constituting the battery. As shown in fig. 4, the battery cell 3 includes a cap assembly 6, a case 4, and an electrode assembly 5.

The electrode assembly 5 is a part in which electrochemical reactions occur in the battery cell 3. One or more electrode assemblies 5 may be contained within the case 4. The electrode assembly 5 is mainly formed by winding or stacking pole pieces, which are divided into a positive pole piece and a negative pole piece, and a separator is generally disposed between the positive pole piece and the negative pole piece. The portions of the positive and negative electrode sheets having the active material constitute the main body 51, and the portions of the positive and negative electrode sheets having no active material each constitute the tab 52. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. During the charge and discharge of the battery, the positive and negative active materials react with the electrolyte, and the tab 52 is connected to the electrode terminal 61 to form a current loop.

The case 4 is an assembly for fitting the cap assembly 6 to form an internal environment of the battery cell 3, wherein the formed internal environment may be used to house the electrode assembly 5, an electrolyte (not shown in the drawings), and other components. The housing 4 and the cap assembly 6 may be separate components, and an opening may be formed in the housing 4, and the cap assembly 6 may cover the opening at the opening to form the internal environment of the battery cell 3. Alternatively, the cap assembly 6 and the housing 4 may be integrated. Alternatively, the cover assembly 6 and the housing 4 may form a common connecting surface before other components are inserted into the housing, and then the cover assembly 6 covers the housing 4 when it is necessary to enclose the inside of the housing 4. The housing 4 may be of various shapes and various sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. The shape of the case 4 may be determined according to the specific shape and size of the electrode assembly 5. The material of the housing 4 may be various, and optionally, the material of the housing 4 is copper, iron, aluminum, stainless steel, aluminum alloy, plastic, or the like.

In some embodiments, as shown in fig. 4, two electrode terminals 61 may be provided in the cap assembly 6. One electrode terminal 61 of the cap assembly 6 is electrically connected to one tab 52 (e.g., a positive tab) of the electrode assembly 5. The other electrode terminal 61 in the cap assembly 6 is electrically connected to the other tab 52 (e.g., a negative tab) of the electrode assembly 5.

In other embodiments, the number of openings of the housing 4 may also be two. Two openings are provided on opposite sides of the housing 4. The number of the top cover components 6 is two. The two top cover assemblies 6 cover the two openings of the shell 4 respectively. In this case, the electrode terminal 61 in the cap assembly 6 may be one. The electrode terminal 61 in one of the cap assemblies 6 is electrically connected to one of the tabs 52 (e.g., positive tabs) of the electrode assembly 5; the electrode terminal 61 of the other cap assembly 6 is electrically connected to the other tab 52 (e.g., the negative tab) of the electrode assembly 5.

Referring to fig. 5 and fig. 6, fig. 5 isbase:Sub>A schematic structural diagram ofbase:Sub>A foil shaping device 7 according to an embodiment of the present application, and fig. 6 isbase:Sub>A cross-sectional view of the foil shaping device atbase:Sub>A-base:Sub>A according to the embodiment of the present application.

As shown in fig. 5 and fig. 6, an embodiment of the present application provides a foil shaping device 7, the foil shaping device 7 includes a pressing mechanism 71 and a preheating mechanism 74, the pressing mechanism 71 includes a first pressing component 72 and a second pressing component 73 that are oppositely disposed along a first direction X, the first pressing component 72 and the second pressing component 73 are used for pressing a foil, a surface of the first pressing component 72 is provided with at least one first protruding portion 721 facing the second pressing component 73; the preheating mechanism 74 is provided upstream of the laminating mechanism 71, and the preheating mechanism 74 is used for heating the foil before the foil enters the laminating mechanism 71.

The first pressing assembly 72 is provided with at least one first protrusion 721 facing the second pressing assembly 73, and the first protrusion 721 is used for pressing an indentation on the foil. The first pressing assembly 72 and the second pressing assembly 73 cooperate with each other to press the foil, and at least a portion of the first protrusions 721 are pressed into the foil under the pressure in the first direction X to form indentations on the surface of the foil. The indentation has improved the roughness of foil, and in the ultrasonic bonding stage, because foil roughness promotes when making two adjacent utmost point ear welds, the friction heat production between utmost point ear promotes, has reduced the risk that rosin joint produced between utmost point ear in proper order, improves welding quality.

Surface roughness refers to the small pitch and small peak-to-valley unevenness of a work surface (e.g., a foil surface). The smaller the surface roughness, the smoother the surface.

Optionally, a plurality of first protrusions 721 are uniformly disposed on the surface of the first pressing assembly 72. Alternatively, the first protrusions 721 are the same in shape and size.

Optionally, the first protrusion 721 is pressed into the foil in the first direction X to a depth not exceeding the thickness of the foil, to reduce the risk of the first protrusion 721 pressing through the foil.

The preheating mechanism 74 is arranged upstream of the laminating mechanism 71, that is, during the operation of the foil shaping device 7, the preheating mechanism 74 is firstly started, and the laminating mechanism 71 is secondly started, or during the foil shaping process, the foil firstly passes through the preheating mechanism 74 and then passes through the laminating mechanism 71. "upstream" merely means the order of production, and does not limit the spatial positions of the preheating mechanism 74 and the pressing mechanism 71.

In these embodiments, the foil shaping device 7 includes a pressing mechanism 71, the pressing mechanism 71 includes a first pressing component 72 and a second pressing component 73, a first protrusion 721 extending toward the second pressing component 73 is disposed on the surface of the first pressing component 72, the first pressing component 72 and the second pressing component 73 press the foil together, and an indentation is formed on the surface of the foil by cooperating with the first protrusion 721, the indentation improves the surface roughness of the foil, during welding, a foil area with high surface roughness can generate higher welding heat, the welding quality between the foils is improved, and the service life of the battery is prolonged; foil shaping device 7 still includes preheating machine structure 74, and preheating machine structure 74 sets up the upper reaches at pressing mechanism 71 for the foil that gets into pressing mechanism 71 preheats, softens the foil, reduces the processing degree of difficulty of pressing mechanism 71 to the material, improves foil shaping device 7's work efficiency, improves foil ductility, has reduced the risk that leads to the rosin joint because of the foil fracture when welding, has improved the welding quality between the foil, has improved the battery life-span.

In some alternative embodiments, as shown in fig. 5 and 6, the surface of the second pressing assembly 73 is provided with a recess 731 corresponding to the first protrusion 721.

Optionally, the recess 731 is disposed on the surface of the second pressing component 73, and the connecting edge between the recess 731 and the surface of the second pressing component 73 is a rounded corner, so that the problem of cracking of the foil due to stress concentration in the recess 731 during pressing is improved by the rounded corner design.

In these embodiments, the surface of the second pressing assembly 73 is provided with a recessed portion 731 corresponding to the first protruding portion 721, the recessed portion 731 provides an avoiding space for at least a portion of the foil pressed by the first protruding portion 721, and the first protruding portion 721 and the recessed portion 731 arranged in cooperation with each other reduce the stamping difficulty of the foil and reduce the risk of cracking of the foil.

In some embodiments, as shown in fig. 5 and 6, the preheating mechanism 74 is at least one of a laser heater or an electromagnetic heater.

Optionally, along first direction X, all be provided with at least one in laser heater or the electromagnetic heater in the both sides of foil, make foil both sides thermally equivalent, improve the ductility of foil, reduce the risk of foil fracture.

In these embodiments, the preheating mechanism 74 is at least one of a laser heater or an electromagnetic heater, and the preheating mechanism 74 is used for preheating the foil entering the laminating mechanism 71, softening the foil, improving the problem of cracking of the foil, reducing the difficulty in processing the material by the laminating mechanism 71, and improving the working efficiency of the foil shaping device 7.

Referring to fig. 7 and 8, fig. 7 is a schematic structural diagram of a foil shaping device 7 according to another embodiment of the present application, and fig. 8 is a cross-sectional view of the foil shaping device at a position B-B according to an embodiment of the present application.

In some embodiments, as shown in fig. 7 and 8, the surface of the second pressing component 73 is provided with second protrusions 732 facing the first pressing component 72, and the orthographic projection of the first protrusions 721 and the orthographic projection of the second protrusions 732 are offset from each other in the first direction X.

Alternatively, the first protrusion 721 and the second protrusion 732 have the same shape and size.

Alternatively, in the first direction X, the projection of the first protrusion 721 is in the middle of the projection of two adjacent second protrusions 732, and the linear distance between the first protrusion 721 and the two adjacent second protrusions 732 is the same, or the projection of the second protrusion 732 is in the middle of the projection of two adjacent first protrusions 721, and the linear distance between the second protrusion 732 and the two adjacent first protrusions 721 is the same.

In these embodiments, the first protruding portions 721 and the second protruding portions 732 are arranged in a staggered manner, and the first protruding portions 721 and the second protruding portions 732 are pressed on the foil synchronously, so that the working efficiency of the foil shaping device 7 is improved, and the two sides of the foil are provided with indentations, so that when the foil is welded, the friction heat generated between two adjacent foils is further increased, the welding quality is improved, and the risk caused by cold welding is reduced.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a pressing mechanism of a foil shaping device according to another embodiment of the present application.

In some embodiments, as shown in fig. 7 to 9, the first pressing assembly 72 includes a first pressing surface 722 for pressing the foil, and the first pressing surface 722 is a plane or a curved surface; and/or the second pressing component 73 comprises a second pressing surface 733 for pressing the foil in cooperation with the first pressing component 72, and the second pressing surface 733 is a plane or curved surface.

The first pressing surface 722 is used for pressing a foil, the first pressing surface 722 is provided with at least one first protrusion portion 721, the second pressing surface 733 is used for being matched with the first pressing surface 722 to press the foil, and the second pressing surface 733 is a smooth surface or at least one of a recess portion 731 and a second protrusion portion 732 is arranged on the second pressing surface 733.

Optionally, the first pressing surface 722 and the second pressing surface 733 are curved surfaces, and the curved surfaces are roll surfaces, that is, the first pressing component 72 and the second pressing component 73 are both pressing rolls, and the first pressing component 72 and the second pressing component 73 cooperate to continuously roll the foil, so that the working efficiency of the foil shaping device 7 is improved.

In these embodiments, when the first pressing surface 72 and the second pressing surface 73 are flat surfaces, the pressing force of the pressing mechanism is easy to adjust, the operation difficulty of the pressing mechanism 71 is low, and when the first pressing surface 722 and the second pressing surface 733 are curved surfaces, the pressing mechanism 71 can continuously stamp the foil, so that the stamping efficiency is high.

In some embodiments, as shown in fig. 9, the first stitching assembly 72 includes a base 723 and a stitching portion 724 detachably disposed on the base 723, and the first stitching surface 722 is disposed on a surface of the stitching portion 724 facing away from the base 723.

Optionally, the pressing portion 724 and the base portion 723 are connected by a detachable snap connection or a detachable bolt connection.

Alternatively, the pressing portion 724 is detachably connected to a side of the base portion 723 facing the second pressing member 73 along the first direction X.

Optionally, the pressing portion 724 is sleeved on the base portion 723.

The first pressing surface 722 is provided with a first protrusion 721, and the shape of the first protrusion 721 on different first pressing surfaces 722 and/or the arrangement of the plurality of first protrusions 721 are different, so that a user can replace different pressing portions 724 by himself according to the actual use environment.

In these embodiments, the first pressing assembly 72 includes a base 723 and a pressing portion 724, the base 723 and the pressing portion 724 are detachably connected, the first pressing surface 722 is disposed on the pressing portion 724, and the pressing mechanism 71 adapted to different use conditions can be obtained by using the pressing portion 724 with different first pressing surfaces 722 to connect with the base 723, thereby improving the practicability of the foil shaping device.

In some embodiments, as shown in fig. 9, the number of the first protruding portions 721 is plural, and the plural first protruding portions 721 are arranged in rows and columns on the first pressing assembly 72.

Optionally, the plurality of first protrusions 721 are uniformly distributed on the surface of the entire first pressing assembly 72, so that the foil is uniformly stressed during stamping, thereby improving the stamping quality.

In these embodiments, the plurality of first protrusions 721 are arranged in rows and columns on the first pressing assembly 72, so that the foil is uniformly stressed, and the stamping quality of the foil is improved.

Referring to fig. 10, fig. 10 is a cross-sectional view of a foil shaping device at a point C-C according to another embodiment of the present application.

In some embodiments, as shown in fig. 9 and 10, a first heating module 725 is disposed within the first lamination assembly 72, the first heating module 725 being configured to heat the first lamination assembly 72, and/or a second heating module 734 is disposed within the second lamination assembly 73, the second heating module 734 being configured to heat the second lamination assembly 73.

Optionally, the first heating modules 725 are uniformly arranged in the first pressing assembly 72, so that the first pressing assembly 72 can uniformly heat the foil; the second heating modules 734 are uniformly arranged in the second pressing assembly 73, so that the second pressing assembly 73 can uniformly heat the foil.

In these embodiments, a first heating module 725 is disposed in the first lamination assembly 72, the first heating module 725 is used to heat the first lamination assembly 72, and the foil is heated by the first lamination assembly 72, so as to improve the ductility and plasticity of the foil and reduce the risk of cracking of the foil caused by quenching of the foil during stamping, and/or a second heating module 734 is disposed in the second lamination assembly 73, the second heating module 734 is used to heat the second lamination assembly 73, and the foil is heated by the second lamination assembly 73 so as to improve the ductility and plasticity of the foil and reduce the risk of cracking of the foil caused by quenching of the foil during stamping.

Referring to fig. 11, fig. 11 is a schematic structural diagram of a foil shaping device 7 according to an embodiment of the present application.

In some embodiments, as shown in fig. 11, the foil shaping device 7 further includes a control mechanism 75, the control mechanism 75 is disposed on the pressing mechanism 71, the control mechanism 75 is configured to change an on-off state of the pressing mechanism 71, the control mechanism includes a transmitting device 751 and a receiving device 752 that are disposed opposite to each other along the first direction X, the transmitting device 751 is configured to transmit a signal to the receiving device 752, and a gap for the foil to pass through is disposed between the transmitting device 751 and the receiving device 752.

The control mechanism 75 comprises a transmitting device 751 and a receiving device 752 which are oppositely arranged along the first direction X, the transmitting device 751 is used for transmitting signals to the receiving device 752, a gap for passing the foil is arranged between the transmitting device 751 and the receiving device 752, when the foil exists in the gap, the receiving device 752 cannot receive the signals, and the laminating mechanism 71 starts laminating. When no foil is present in the gap, the receiving device 752 receives the signal from the emitting device 751 and the stitching mechanism 71 stops.

Optionally, the emitting device 751 is a laser emitter, and the receiving device 752 is a laser receiver.

In these embodiments, the control mechanism 75 is used to control the start/stop state of the stitching mechanism 71.

In some embodiments, as shown in fig. 11, the foil shaping device further includes an adjusting mechanism 76, the adjusting mechanism 76 is connected to the first pressing assembly 72, and the adjusting mechanism 76 is used for adjusting the distance between the first pressing assembly 72 and the second pressing assembly 73 in the first direction X.

Optionally, the adjusting mechanism 76 is a jacking cylinder connected to the first pressing assembly 72 in the first direction X.

In these embodiments, the adjusting mechanism 76 is used to control the distance between the first pressing assembly 72 and the second pressing assembly 73 in the first direction X, so as to adjust the stamping effect of the pressing mechanism 71 on the foil, thereby improving the practicability of the foil shaping device 7.

Referring to fig. 12 and 13, fig. 12 is a schematic structural diagram of a pole piece 53 according to an embodiment of the present application, and fig. 13 is an enlarged structural diagram of a position D in fig. 12.

The embodiment of the application provides a pole piece 53, and pole piece 53 includes main part 51 and utmost point ear 52, and utmost point ear 52 has the multilayer, and utmost point ear 52 is stretched out by main part 51, is provided with knurling district 54 on the utmost point ear 52, and multilayer utmost point ear 52 connects in knurling district 54.

Alternatively, the embossed regions 54 of each tab 52 are the same.

Referring to fig. 13 to 16, fig. 13 to 16 are schematic views of four tab structures with different embossed regions.

Alternatively, the embossments in the embossed region 54 may be arranged in a dot-like array or extend continuously in stripes.

In the embodiments, the pole piece 52 comprises a main body part 51 and a plurality of layers of tabs 52 extending from the main body part 51, the tabs 52 are provided with embossed areas 54, the embossed areas 54 improve the surface roughness and the heat conductivity of the tabs 52, the plurality of layers of tabs 52 are connected in the embossed areas 54, during the welding operation, the embossed areas 54 generate more heat by friction, the embossed areas 54 generate more heat to melt metal, the welding compatibility of two adjacent tabs 52 is improved, the welding quality of the tabs 52 is improved, and the battery performance is improved.

In some embodiments, as shown in fig. 12 to 16, the pole piece 53 is made of one of stainless steel, copper alloy, aluminum alloy, nickel alloy, iron, titanium and titanium alloy.

Optionally, the pole piece 53 made of stainless steel has high structural strength, good stability and low cost.

Referring to fig. 17, fig. 17 is a sectional view taken along line D-D of fig. 13.

In some embodiments, as shown in fig. 17, in the thickness direction of the tab 52, the embossed region 54 of the tab 52 has a groove 541 on one side and a convex hull 542 corresponding to the groove 541 on the other side.

In the thickness direction of the tab 52, when one side of the tab 52 is pressed, the pressed side is recessed into the tab 52 to form a groove 541, and when the other side of the tab 52, a part of the tab 52 is pressed to protrude out of the tab 52 to form a convex hull 542.

In these embodiments, the embossed region 54 of the tab 52 is provided at both sides thereof with the grooves 541 and the convex hulls 542 corresponding to the grooves 541, respectively, so that the surface roughness of the embossed region 54 is improved, and the welding quality of the tab 52 is improved.

The embodiment of the application provides a battery cell, including the pole piece that any above-mentioned embodiment provided.

The embodiment of the application provides a battery, which comprises the battery cell provided by any one of the above embodiments.

The embodiment of the application provides an electric device, which comprises the battery provided by any one of the embodiments, wherein the battery is used for providing electric energy.

According to some embodiments of the present application, as shown in fig. 1 to 17, the present application provides a foil shaping device 7, and the foil shaping device 7 includes a pressing mechanism 71, a preheating mechanism 74, a control mechanism 75, and an adjusting mechanism 76.

The pressing mechanism 71 includes a first pressing component 72 and a second pressing component 73 which are oppositely arranged along a first direction X, the first pressing component 72 and the second pressing component 73 are used for pressing foil, the surface of the first pressing component 72 is provided with at least one first protrusion 721 facing the second pressing component 73, the surface of the second pressing component 73 is provided with a second protrusion 732 facing the first pressing component 72, and in the first direction X, the orthographic projection of the first protrusion 721 and the orthographic projection of the second protrusion 732 are mutually staggered; the first pressing assembly 72 includes a first pressing surface 722 for pressing the foil, and the first pressing surface 722 is a plane or a curved surface; and/or the second pressing component 73 comprises a second pressing surface 733 for pressing the foil to match the first pressing component 72, the second pressing surface 733 is a plane or curved surface, the first pressing component 72 comprises a base 723 and a pressing part 724 detachably arranged on the base 723, the first pressing surface 722 is arranged on the surface of the pressing part 724 departing from the base 723, the number of the first protruding parts 721 is multiple, and the multiple first protruding parts 721 are arranged in rows and columns on the first pressing component 72; a first heating module 725 is disposed within the first lamination assembly 72, the first heating module 725 being configured to heat the first lamination assembly 72, and/or a second heating module 734 is disposed within the second lamination assembly 73, the second heating module 734 being configured to heat the second lamination assembly 73.

The preheating mechanism 74 is disposed upstream of the laminating mechanism 71, the preheating mechanism 74 is used for heating the foil before the foil enters the laminating mechanism 71, and the preheating mechanism 74 is at least one of a laser heater or an electromagnetic heater.

The control mechanism 75 is arranged on the pressing mechanism 71, the control mechanism 75 is used for changing the start-stop state of the pressing mechanism 71, the control mechanism 75 comprises a transmitting device 751 and a receiving device 752 which are oppositely arranged along the first direction X, the transmitting device 751 is used for transmitting signals to the receiving device 752, and a gap for foil to pass through is arranged between the transmitting device 751 and the receiving device 752.

The adjusting mechanism 76 is connected to the first pressing assembly 72, and the adjusting mechanism 76 is used for adjusting the distance between the first pressing assembly 72 and the second pressing assembly 73 in the first direction X.

The application also provides a pole piece 53, pole piece 53 includes main part 51 and utmost point ear 52, and utmost point ear 52 has the multilayer, and utmost point ear 52 is stretched out by main part 51, is provided with knurling district 54 on utmost point ear 52, and multilayer utmost point ear 52 connects in knurling district 54, and pole piece 53 is stainless steel material, and in the thickness direction of utmost point ear 52, the knurling district 54 of utmost point ear 52, one side is recess 541, and the opposite side is provided with the convex closure 542 who corresponds with recess 541.

In these embodiments, the foil shaping device 7 includes a pressing mechanism 71, the pressing mechanism 71 includes a first pressing component 72 and a second pressing component 73, a first protrusion 721 extending toward the second pressing component 73 is disposed on the surface of the first pressing component 72, the first pressing component 72 and the second pressing component 73 press the foil together, and an indentation is formed on the surface of the foil by cooperating with the first protrusion 721, the indentation improves the surface roughness of the foil, during welding, a foil area with high surface roughness can generate higher welding heat, the welding quality between the foils is improved, and the service life of the battery is prolonged; foil shaping device 7 still includes preheating machine structure 74, and preheating machine structure 74 sets up the one side at pressing mechanism 71 for the foil that gets into pressing mechanism 71 preheats, softens the foil, reduces pressing mechanism 71 to the processing degree of difficulty of material, improves foil shaping device 7's work efficiency, improves foil ductility, has reduced the risk that leads to the rosin joint because of the foil fracture when welding, has improved the welding quality between the foil, has improved the battery life-span.

In the embodiments, the pole piece 53 includes a main body 51 and a plurality of layers of tabs 52 extending from the main body 51, the tabs 52 are provided with embossed regions 54, the embossed regions 54 improve the surface roughness and the heat conductivity of the tabs 52, the plurality of layers of tabs 52 are connected in the embossed regions 54, during the welding operation, the embossed regions 54 generate more heat by friction, the embossed regions 54 generate more heat to melt metal, the welding compatibility of two adjacent tabs 52 is improved, the welding quality of the tabs 52 is improved, and the battery performance is improved.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (16)

1. A foil shaping device, comprising:

the laminating mechanism comprises a first laminating component and a second laminating component which are oppositely arranged along a first direction, the first laminating component and the second laminating component are used for extruding foil, and the surface of the first laminating component is provided with at least one first protruding part facing the second laminating component;

the preheating mechanism is arranged at the upstream of the pressing mechanism and used for heating the foil before the foil enters the pressing mechanism.

2. Foil reshaping device according to claim 1, wherein the surface of the second press component is provided with a recess corresponding to the first protrusion.

3. The foil shaping device of claim 1, wherein the preheating mechanism is at least one of a laser heater or an electromagnetic heater.

4. A foil shaping device according to claim 1, wherein a surface of the second press component is provided with a second projection facing the first press component, and an orthographic projection of the first projection is offset from an orthographic projection of the second projection in the first direction.

5. A foil shaping device according to claim 1, wherein the first pressing assembly comprises a first pressing surface for pressing the foil, the first pressing surface being a plane or a curved surface;

and/or the second pressing component comprises a second pressing surface which is used for matching with the first pressing component to press the foil, and the second pressing surface is a plane or a curved surface.

6. A foil shaping device according to claim 5, wherein the first press-fit assembly comprises a base part and a press-fit part detachably provided to the base part, the first press-fit surface being arranged at a surface of the press-fit part facing away from the base part.

7. The foil shaping device of claim 1, wherein the number of the first protrusions is plural, and the plural first protrusions are arranged in rows and columns on the first pressing assembly.

8. The foil shaping device of claim 1, wherein a first heating module is disposed within the first lamination assembly, the first heating module being configured to heat the first lamination assembly, and/or wherein a second heating module is disposed within the second lamination assembly, the second heating module being configured to heat the second lamination assembly.

9. The foil shaping device of claim 1, further comprising:

the control mechanism is arranged on the pressing mechanism and used for changing the starting and stopping states of the pressing mechanism, the control mechanism comprises a transmitting device and a receiving device which are oppositely arranged along the first direction, the transmitting device is used for transmitting signals to the receiving device, and a gap for foil to pass through is arranged between the transmitting device and the receiving device.

10. The foil shaping device of claim 1, further comprising:

and the adjusting mechanism is connected with the first pressing component and is used for adjusting the distance between the first pressing component and the second pressing component in the first direction.

11. A pole piece, comprising:

a main body portion;

the tab is provided with a plurality of layers, the tab extends out of the main body part, an embossed area is arranged on the tab, and the tabs with the plurality of layers are connected in the embossed area.

12. The pole piece of claim 11, wherein the pole piece is made of one of stainless steel, copper alloy, aluminum alloy, nickel alloy, iron, titanium and titanium alloy.

13. The pole piece as claimed in claim 11, wherein the embossed area of the tab is provided with a groove on one side and a convex hull corresponding to the groove on the other side in the thickness direction of the tab.

14. A battery cell comprising a pole piece according to any one of claims 11 to 13.

15. A battery comprising the cell of claim 14.

16. An electrical consumer, characterized in that the consumer comprises a battery according to claim 15 for providing electrical energy.

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