CN117810555A

CN117810555A - Tab flattening device, tab flattening control method and battery production system

Info

Publication number: CN117810555A
Application number: CN202410233484.8A
Authority: CN
Inventors: 吴学兵; 倾亚龙; 潘峰; 唐焯林
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-03-01
Filing date: 2024-03-01
Publication date: 2024-04-02

Abstract

The utility model relates to a utmost point ear is rubbed flat device, utmost point ear is rubbed flat control method and battery production system, utmost point ear is rubbed flat structure and include installation main part, rub flat head and edge constraint piece, rub flat head rotation and locate installation main part and the one side protrusion setting of installation main part relatively, rub the surface formation of flat head and rub the plane that can contact with the surface of utmost point ear, edge constraint piece locates the periphery of rubbing flat head, and installs main part one side protrusion relatively and form the binding face that can contact with the marginal tip of utmost point ear. Therefore, the tab flattening structure can flatten the tab and restrict the edge end of the tab, limit the flattened tab within a safety range, reduce the possibility that the flash of the tab is overlapped with other parts of the battery, and accordingly improve the reliability of the battery.

Description

Tab flattening device, tab flattening control method and battery production system

Technical Field

The application relates to the technical field of battery processing, in particular to a tab flattening device, a tab flattening control method and a battery production system.

Background

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

The rubbing is a key process in the manufacturing process of the full tab battery, and in the related art, a tab rubbing structure is generally adopted to perform rubbing treatment on the tab at the end part of the electrode assembly, but the reliability risk is reduced due to the fact that the electrode assembly of the battery is easy to corrode and leak.

Disclosure of Invention

Based on this, it is necessary to provide a tab flattening device that improves the reliability of the battery while flattening the tabs.

In a first aspect, the present application provides a tab flattening device, comprising: a driving member; the tab rubbing structure is driven by the driving member and rotates circumferentially or spirally around the axial direction of the electrode assembly, and includes: the device comprises an installation main body, a rubbing flat head and an edge constraint piece, wherein the rubbing flat head is arranged on the installation main body in a protruding mode relative to one side of the installation main body, a rubbing plane capable of being contacted with the surface of the pole ear is formed on the outer surface of the rubbing flat head, the edge constraint piece is arranged on the periphery of the rubbing flat head, and a constraint surface capable of being contacted with the edge end portion of the pole ear is formed in a protruding mode relative to one side of the installation main body.

In the technical scheme of this application embodiment, can rub the utmost point ear and level the while, retrain the marginal tip of utmost point ear, will be rubbed the utmost point ear after the level and inject in the safety margin, reduce its overlap and arouse the possibility with other positions overlap joints of battery to improve the reliability of battery.

In some embodiments, the mounting body has a mounting surface, the kneading flat head and the edge constraint member are both protruded relative to the mounting surface, and the tab kneading flat structure further comprises an adjusting member connected with the edge constraint member and used for adjusting the protruded distance of the edge constraint member relative to the mounting surface.

In the technical scheme of this application embodiment, can change the spacing position of restraint face through the regulating part to be applicable to various different situations.

In some embodiments, the mounting body has a mounting hole in communication with the mounting surface, the adjusting member includes a connecting portion and an adjusting portion, the connecting portion is disposed in the mounting hole in a penetrating manner and is connected to the edge constraint member on one side of the mounting surface, the adjusting portion is disposed on one side of the connecting portion away from the edge constraint member, and the adjusting portion is configured to adjust an axial position of the connecting portion in the mounting hole.

In the technical scheme of this application embodiment, the mounting hole can be along rubbing the direction of stretching out of flat head and running through the installation main part setting, and the axis direction and the installation face of mounting hole set up perpendicularly this moment, and connecting portion can be for wearing to locate the columnar structure in the mounting hole and by adjusting part regulation to change the protrusion distance of edge restraint relative to the installation face.

In some embodiments, the tab rubbing structure further includes an elastic member, where the elastic member is disposed at the connection portion and has one end connected to the edge constraint member, and the elastic member can apply an abutment constraint force through the edge constraint member.

In the technical scheme of the embodiment of the application, the elastic piece can apply elastic constraint force to the tab through the edge constraint piece, so that the phenomenon of decarbonizing and lithium precipitation of the electrode assembly caused by overlarge rigid pressure is relieved.

In some embodiments, the connection includes a first connection section and a second connection section that are connected to each other. The other end of first linkage segment is connected with edge constraint spare, and the one end part of second linkage segment stretches out the mounting hole, and adjustment part detachably overlaps to locate on the second linkage segment wears out the part of mounting hole, and can deviate from one side butt of installation face with the installation main part. The elastic piece is sleeved on the periphery of the second connecting section, and two ends of the elastic piece are respectively abutted with the inner walls of the first connecting section and the mounting hole.

In the technical scheme of this embodiment, when connecting portion installs in the mounting hole, because the external diameter of second linkage segment is less, consequently when first linkage segment and mounting hole pore wall butt, there is the clearance between second linkage segment and the mounting hole pore wall, and the elastic component cover is located the second linkage segment and is located this clearance, and one end is connected with the step face of first linkage segment, and the other end is connected with the inner wall butt of mounting hole towards the step face for the elastic component produces along the elasticity restraining force of mounting hole axis.

In some embodiments, the adjusting portion is sleeved on the second connecting section and is detachably connected with the second connecting section through threads.

In the technical scheme of this application embodiment, through threaded connection, conveniently realized the position adjustment of connecting portion in the mounting hole of installation main part.

In some embodiments, the edge restraints comprise a plurality of edge restraints evenly spaced circumferentially about the periphery of the kneading head.

In the technical scheme of this application embodiment, rub the flat head and rotate and rub a plurality of utmost point ears in the time of leveling, a plurality of edge restraint piece are retrained the plastic to the marginal tip of a plurality of utmost point ears in proper order to reach even harvest effect.

In some embodiments, the constraint surface is arcuately disposed and the edge constraint is rotatable relative to the mounting body.

In the technical scheme of this application embodiment, rub the flat in-process of rubbing the flat head to the utmost point ear, the edge restraint piece can be relative the installation main part rotates to make curved restraint face rotate relative the utmost point ear, thereby through the roll mode, reduce rub the risk of producing metal particle on the flat in-process utmost point ear.

In some embodiments, the rubbing plane is cone-shaped.

In the technical scheme of this application embodiment, edge restraint is located installation face one side and is close to the biggest one side setting of diameter of rubbing the plane, and the point of rubbing the plane is close to the geometric center setting of electrode assembly's terminal surface for rub the relative terminal surface of flat head and rotate a round, accomplish the rubbing of all lugs promptly.

According to a second aspect of the present application, there is also provided a tab flattening method, employing the tab flattening device of any one of the above, the method comprising the steps of: the electrode lug rubbing structure is controlled to move towards one side of the electrode lug of the electrode assembly, so that a rubbing plane of the rubbing flat head and a restraint surface of the edge restraint are respectively and correspondingly abutted against the surface of the electrode lug and the edge end part; the control lug rubbing structure rotates circumferentially or spirally around the axial direction of the electrode assembly.

By the design, the edge end part of the tab can be restrained while the tab is kneaded, the kneaded tab is limited in a safety range, the possibility that the burr of the tab is overlapped with other parts of the battery is reduced, and therefore the reliability of the battery is improved.

In some embodiments, the step of controlling the tab balancing structure to rotate circumferentially or spirally about the axial direction of the electrode assembly includes: the pole ear rubbing structure is controlled to rotate around the axial direction of the electrode assembly, so that the rotating speed of the pole ear rubbing structure reaches the set rotating speed; the pole ear kneading structure is controlled to move towards one side of the pole ear.

By means of the design, the action of the pole ear rubbing structure is reasonably controlled, so that the pole ear rubbing is more stable, and the rubbing effect is better.

According to a third aspect of the present application, there is also provided a battery production system including the tab leveling device of any one of the above.

The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

Various other 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 designate like parts throughout the accompanying drawings. In the drawings:

fig. 1 is a schematic structural diagram of a vehicle provided in accordance with one or more embodiments of the present application.

Fig. 2 is an exploded view of a battery provided in accordance with one or more embodiments of the present application.

Fig. 3 is an exploded view of a battery cell according to one or more embodiments of the present application.

Fig. 4 is an exploded view of a tab balancing structure provided in accordance with one or more embodiments of the present application.

Fig. 5 is a schematic cross-sectional view of the tab rolling structure provided in fig. 4.

Fig. 6 is a schematic perspective view illustrating the cooperation of the tab rolling structure and the electrode assembly provided in fig. 4.

Fig. 7 is a schematic plan view of the tab balancing structure provided in fig. 4 and the electrode assembly engaged therewith.

Fig. 8 is a flowchart of a tab rolling control method according to one or more embodiments of the present application.

Fig. 9 (a) - (d) are respectively schematic structural diagrams of electrode assemblies in the process of kneading the tabs according to one or more embodiments of the present application.

Fig. 10 is a second flowchart of a tab rolling control method according to one or more embodiments of the present application.

1000. A vehicle; 100. a battery; 30. a controller; 40. a motor; 11. a case; 111. a first box portion; 112. a second box portion; 20. a battery cell; 21. a housing; 22. an end cap; 23. an electrode assembly; 24. an end face; l, axis; 25. A tab; 251. an edge end; 252. the surface of the tab; 200. a pole ear rubbing structure; 210. a mounting main body; 211. a mounting surface; 212. a mounting hole; 220. rubbing the flat heads; 221. rubbing a plane; 230. an edge constraint; 231. a constraining surface; 240. an adjusting member; 241. a connection part; 2411. a first connection section; 2412. a second connection section; 242. an adjusting section; 250. an elastic member; 300. and (5) fixing the clamp.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, 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 application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural sheets" refers to two or more (including two).

In the description of the embodiments of the present application, the orientation or positional relationship indicated by 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", etc. are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of describing the embodiments of the present application and for simplifying the description, rather than indicating or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured" and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

As a green energy battery, a solar battery is widely used in view of the development of market situation. The solar battery is not only applied to a photovoltaic power generation system such as a solar power station, but also gradually applied to electric equipment such as an electric automobile. With the continuous expansion of the application field of solar cells, the market demand of the solar cells is also continuously expanding.

In the production process of cylindrical batteries, an important process is the preparation of tabs. For a cylindrical battery of a full tab structure, when the positive and negative current collectors are coated with the positive and negative active material layers, a piece of empty foil area is left at the edges of the positive and negative current collectors, and the empty foil area serves as a tab. Because the thickness of the foil body at the edge end part of the tab is thin, the edge end part of the tab is uneven, and flanging and more burrs can possibly occur, so that when the tab is welded with the current collecting plate, the local area of the edge end part of the tab cannot be welded with the current collecting plate in a contact manner, and the welding area is unstable.

In order to facilitate the subsequent welding of the current collecting disc at the end part of the electrode assembly and ensure the welding quality, the electrode lugs of the electrode assembly are required to be flattened by adopting a lug flattening structure, and the upright electrode lugs at the end part of the electrode assembly are rubbed into a plane so that the electrode lugs of all layers are in close contact.

The shaping mode that usually adopts contains machinery and kneads plains, and machinery kneads plains and is to adopt the mechanical component rotatory extrusion utmost point ear to knead plains the utmost point ear of battery and carry out the plastic for the utmost point ear is pressed and is lodged in electrode assembly's tip, however, kneads plains the in-process to the utmost point ear at utmost point ear and kneads plains the structure, and the limit portion of utmost point ear produces the overlap phenomenon easily and does not lodge in electrode assembly's tip according to predetermineeing the direction, leads to the edge of utmost point ear to upwarp or insert down, overlap joint with electrode assembly of battery, produces the risk of corroding battery, battery weeping etc. and reduces the reliability.

Based on this, in order to solve some reduction reliability problems that the overlap produced in the current utmost point ear and rub the flat in-process, this application provides an utmost point ear and rub the flat device, when providing to rub the plane and rub the utmost point ear mechanically, provide the restraint piece of edge restraint piece to restraint the edge of utmost point ear, make it rub behind the flat restraint piece of edge restraint piece lodge in safe range to improve battery reliability.

The technical solutions described in the embodiments of the present application are all applicable to a cylindrical battery cell, which is applicable to various devices using a battery, for example, a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric toy, an electric tool, an electric vehicle, a ship, a spacecraft, and the like, and for example, a spacecraft includes an airplane, a rocket, a space plane, a spacecraft, and the like.

It should be understood that the technical solutions described in the embodiments of the present application are not limited to the above-described devices, but may be applied to all devices using batteries, but for simplicity of description, the following embodiments are described by taking an electric vehicle as an example.

For example, as shown in fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to an embodiment of the present application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The motor 40, the controller 30, and the battery 100 may be disposed inside the vehicle 1000, and the controller 30 is configured to control the battery 100 to supply power to the motor 40. For example, the battery 100 may be provided at the bottom or the head or tail of the vehicle 1000. Battery 100 may be used to power vehicle 1000, for example, battery 100 may be used as an operating power source for vehicle 1000, for circuitry of vehicle 1000, for example, for operating power requirements during start-up, navigation, and operation of vehicle 1000. In another embodiment of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

To meet different power requirements for use, the battery 100 may include a plurality of battery cells. For example, as shown in fig. 2, a schematic structure of a battery 100 according to an embodiment of the present application, the battery 100 may include a plurality of battery cells 20. The battery 100 may further include a case 11, in which the case 11 has a hollow structure, and the plurality of battery cells 20 are received in the case 11. For example, a plurality of battery cells 20 are connected in parallel or in series-parallel combination with each other and then placed in the case 11. The case 11 may include a first case portion 111 and a second case portion 112, provided that it can accommodate the battery cells, without being particularly limited herein.

Alternatively, the battery 100 may further include other structures, which are not described in detail herein. For example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 20, such as parallel or series-parallel connection. Specifically, the bus member may realize electrical connection between the battery cells 20 by connecting electrode terminals of the battery cells 20. Further, the bus member may be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the plurality of battery cells 20 may be further drawn through the housing by a conductive mechanism. Alternatively, the conductive means may also belong to the bus bar member.

The number of battery cells 20 may be set to any number according to different power requirements. The plurality of battery cells 20 may be connected in series, parallel, or series-parallel to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery 100 may be large, the battery cells 20 may be arranged in groups for easy installation, and each group of battery cells 20 constitutes a battery module. The number of battery cells 20 included in the battery module is not limited, and may be set according to requirements. The battery may include a plurality of battery modules, which may be connected in series, parallel, or series-parallel.

Fig. 3 is a schematic structural diagram of a battery cell 20 according to an embodiment of the present application. The battery cell 20 includes a case 21, an end cap 22, and an electrode assembly 23. The housing 21 and the end cap 22 form a casing or battery case, and the wall of the housing 21 and the wall of the end cap 22 are both referred to as the wall of the battery cell 20. The case 21 is dependent on the shape of the one or more electrode assemblies 23 combined. For example, the case 21 may be a hollow cylinder as shown in fig. 3, or, if the battery cell 20 is a blade type battery cell, the case 21 may be a rectangular parallelepiped having a long length. And at least one face of the case 21 has an opening so that one or more electrode assemblies 23 are placed in the case 21. For example, when the housing 21 is a hollow cylinder, the end face 24 of the housing 21 is an open face, i.e., the end face 24 has no wall body so that the inside and outside of the housing 21 communicate. As can be seen in fig. 3, the cylindrical battery cell has two circular end faces 24 with a cylindrical body between the two circular end faces 24, and the cylindrical body portion may include an electrode assembly 23. The end cap 22 covers the opening and is connected with the case 21 to form a closed cavity preventing the electrode assembly 23. The housing 21 is filled with an electrolyte, such as an electrolytic solution. In the battery cell 20, the electrode assembly 23 may be provided in a single unit, or in a plurality of units, according to actual use requirements, and in some embodiments of the present application, as shown in fig. 3, one electrode assembly 23 is provided in the battery cell 20.

According to some embodiments of the present application, referring to fig. 4 to 7, the present application provides a tab flattening device, which includes a driving member and a tab flattening structure 200, the tab flattening structure 200 is driven by the driving member and rotates circumferentially or spirally around an axis L direction of an electrode assembly, and includes: the device comprises a mounting body 210, a rubbing flat head 220 and an edge restraint 230, wherein the rubbing flat head 220 is rotatably arranged on the mounting body 210 and protrudes from one side of the mounting body 210, the outer surface of the rubbing flat head 220 forms a rubbing plane 221 which can be contacted with the surface 252 of the tab, the edge restraint 230 is arranged on the periphery of the rubbing flat head 220, and the restraint surface 231 which protrudes from one side of the mounting body 210 and can be contacted with the edge end 251 of the tab 25 is formed.

The mounting body 210 is a base for mounting the kneading head 220, the edge constraint 230, or other structural members, and the kneading head 220 may rotate circumferentially with respect to the mounting body 210 such that the kneading plane 221 of the outer circumferential surface of the kneading head 220 contacts the surface 252 of the tab, thereby generating unidirectional pressure to the tab 25 and kneading it to a predetermined tab height. Of course, the rotation of the rubbing flat 220 around the axis thereof may be realized by the rotation of the mounting body 210 to drive the rubbing flat 220 to rotate.

The tab height refers to a height of the tab 25 protruding from the end surface 24 of the electrode assembly 23 on the side connected to the tab 25 along the axis L of the electrode assembly 23.

It can be understood that, when the tabs 25 of the cylindrical battery 100 are flattened, the rubbing flat head 220 can be driven to revolve around the circumference of the cylindrical battery 100 by the mounting body 210 while the rubbing flat head 220 rotates relative to the mounting body 210, and the flattening of the tabs 25 on the end surface 24 is achieved during the rotation.

Alternatively, when the tabs 25 of the cylindrical battery 100 are flattened, the cylindrical battery 100 can also be reversely rotated circumferentially while the flat-twisting head 220 is rotated relative to the mounting body 210, and the flattening of the plurality of tabs 25 on the end face 24 is achieved during the rotation.

The rubbing flat head 220 may have a cylindrical shape, a conical shape, etc., and an arc-shaped rubbing plane 221 is formed on the outer surface thereof, and the rubbing plane 221 rotates and unidirectionally presses the tab 25 while the rubbing flat head 220 rotates circumferentially, thereby pressing the tab 25 upside down.

The edge constraint piece 230 is a component that constrains the edge position of the tab 25 during the rubbing process of the tab 25, so that all the areas where the tab 25 is located after the rubbing process are located inside the movement track of the constraint surface 231. When the edge restraining member 230 protrudes from one side of the mounting surface 211 with respect to the mounting body 210, the restraining surface 231 is located at one side edge position of the rubbing plane 221, so that the edge end 251 of the tab 25 rubbed by the rubbing plane 221 is restrained continuously while the rubbing flat head 220 is rubbed, so that the edge end 251 of the tab 25 can be limited to the outer edge range of the end surface 24 of the electrode assembly 23, the risk that the edge of the tab 25 is snapped to a non-end surface position after rubbing flat is reduced, and the reliability of the battery 100 is improved. The edge end 251 of the tab 25 refers to the area of the tab 25 closest to the outer edge of the end face 24 of the electrode assembly 23 after the tab 25 is kneaded, and the edge end 251 of the tab 25 is the position farthest from the geometric center after the tab 25 is kneaded, based on the geometric center of the end face 24.

As shown in fig. 2, in the initial state, the flat kneading heads 220 may be directly attached to the end face 24 of the electrode assembly 23, and the driving member is turned on to drive the tab flattening structures 200 to rotate circumferentially, and simultaneously, the flat kneading heads 220 on each tab flattening structure 200 rotate circumferentially to knead the tabs 25. Meanwhile, the edge restraint 230 on each tab rubbing structure 200 restrains and limits the edge end 251 of the tab 25, so that the risk that the tab 25 overlaps the position outside the end face 24 of the electrode assembly 23 due to flash generated by rubbing is reduced.

In another embodiment, in the initial state, the rubbing flat head 220 is far away from the end face 24 of the electrode assembly 23, and the driving member is turned on to drive the tab rubbing structure 200 to rotate spirally around the axial direction L of the electrode assembly 23 until the tab rubbing structure 200 gradually approaches the tab 25 along the axial direction L to rub the tab 25.

Specifically, the driving member and the tab rubbing structure 200 may be directly connected to the mounting body 210, or one end of the rubbing flat head 220 connected to the mounting body 210 may directly penetrate through the mounting body 210 and be connected to the driving member from an end facing away from the mounting surface 211.

In this way, the tab flattening structure 200 of the present application can flatten the tab 25, and simultaneously restrict the edge end 251 of the tab 25, limit the flattened tab 25 within a safe range, reduce the possibility that the flash of the tab will cause overlap with other parts of the battery 100, thereby improving the reliability of the battery after flattening the tab 25.

In some embodiments, optionally, the mounting body 210 has a mounting surface 211, the rubbing flat head 220 and the edge constraint member 230 are protruded relative to the mounting surface 211, and the tab rubbing structure 200 further includes an adjusting member 240, where the adjusting member 240 is connected to the edge constraint member 230 and is used for adjusting the protruded distance of the edge constraint member 230 relative to the mounting surface 211.

The mounting surface 211 is formed on one side surface of the mounting body 210, the rubbing head 220 is protruded with respect to the mounting surface 211, and the edge restraining member 230 may be protruded from one side of the mounting surface 211, and at this time, the rubbing action of the rubbing head 220 and the restraining edge action of the edge restraining member 230 are completed from the side facing the mounting surface 211.

The adjusting member 240 can adjust the protruding distance of the edge restraining member 230 relative to the mounting surface 211, so that the protruding degree of the edge restraining member 230 relative to the mounting surface 211 is changed, so as to adjust the limiting position of the restraining surface 231.

For example, when the size of the tab 25 of the electrode assembly 23 is small or the size of the end face 24 of the electrode assembly 23 is small, the distance that the edge constraint member 230 protrudes from the mounting face 211 may be increased, and at this time, the constraint face 231 is located further inward than the outer edge of the end face 24, and the area of the tab 25 that can be flattened by the rubbing plane 221 is reduced compared to the geometrical center of the end face 24. Vice versa, no further description is given here.

Thus, the tab rubbing structure 200 provided by the application can change the limit position of the constraint surface 231 through the adjusting piece 240 so as to be applicable to various different situations.

It can be appreciated that the motion trace of the constraint surface 231 is located within the outer edge of the end surface 24 and outside the edge end 251 of all the tabs 25 kneaded by the kneading plane 221 during the entire kneading process of the tabs 25.

In some embodiments, optionally, the mounting body 210 has a mounting hole 212 communicating with the mounting surface 211, the adjusting member 240 includes a connecting portion 241 and an adjusting portion 242, the connecting portion 241 is disposed in the mounting hole 212 and connected to the edge constraint member 230 at one side of the mounting surface 211, the adjusting portion 242 is disposed at a side of the connecting portion 241 away from the edge constraint member 230, and the adjusting portion 242 is used for adjusting an axial position of the connecting portion 241 in the mounting hole 212.

The connecting portion 241 is disposed in the mounting hole 212 in a penetrating manner, and forms a first connecting end close to the mounting surface 211 and a second connecting end far away from the mounting surface 211 along an axial direction of the mounting hole 212, the edge constraint member 230 is disposed at the first connecting end, the adjusting member 240 is disposed at the second connecting end, and the adjusting member 240 can adjust an axial position of the connecting portion 241 in the mounting hole 212, so that the second connecting end drives the edge constraint member 230 to penetrate through the mounting hole 212 and protrude relative to the mounting surface 211. The axial position of the connecting portion 241 in the mounting hole 212 refers to the position of the connecting portion 241 in the mounting hole 212 in the axial direction.

The mounting hole 212 may be disposed through the mounting body 210 along the extending direction of the rubbing flat 220, and at this time, the axial direction of the mounting hole 212 is perpendicular to the mounting surface 211, and the connection portion 241 may be a columnar structure disposed through the mounting hole 212 and adjusted by the adjusting portion 242, so as to change the protruding distance of the edge constraint 230 relative to the mounting surface 211.

The adjusting portion 242 may be, but is not limited to, a common driving structure such as a motor or other mechanical limiting structure.

In some embodiments, optionally, the tab balancing structure 200 further includes an elastic member 250, where the elastic member 250 is disposed on the connecting portion 241 and has one end connected to the edge constraint member 230, and the elastic member 250 can apply an pressing constraint force through the edge constraint member 230.

Specifically, when the edge end 251 of the tab 25 is constrained by the constraining surface 231, a certain rigid pressure is caused to the tab 25, if the constraint to the tab 25 is too large, the phenomenon of decarburizing and lithium precipitation on the surface is easy to occur, and based on this, the application is further provided with the elastic member 250, and the elastic member 250 can apply an elastic constraining force to the tab 25 through the edge constraining member 230, so that the phenomenon of decarburizing and lithium precipitation of the electrode assembly 23 caused by the too large rigid pressure is relieved.

One end of the elastic member 250 is connected to the connection portion 241, and the other end thereof may be connected to the hole wall of the mounting hole 212 or the adjustment portion 242, which releases the elastic restraining force to the end of the connection portion 241 connected to the edge restraining member 230 when the elastic member 250 is compressed, so that the edge restraining member 230 applies the elastic restraining force to the tab 25 through the restraining surface 231.

It can be appreciated that the arrangement of the elastic member 250 avoids the rigid contact between the edge constraint member 230 and the edge end 251 of the tab 25, and protects the tab 25 to a certain extent, and meanwhile, the elastic members 250 with different elastic moduli can be selected according to the requirement, so as to provide elastic constraint forces with different magnitudes to adapt to different strengths of the tab 25.

The specific arrangement form of the elastic member 250 is not limited, and the purpose thereof is to achieve elastic abutment of the edge constraint member 230 with the tab 25.

In some embodiments, the connection 241 optionally includes a first connection segment 2411 and a second connection segment 2412 that are connected to each other. The other end of the first connecting segment 2411 is connected with the edge constraint member 230, one end portion of the second connecting segment 2412 extends out of the mounting hole 212, and the adjusting portion 242 is detachably sleeved on the portion of the second connecting segment 2412 penetrating out of the mounting hole 212 and can abut against one side of the mounting main body 210 away from the mounting surface 211. The elastic member 250 is sleeved on the outer periphery of the second connecting section 2412, and two ends of the elastic member respectively abut against the first connecting section 2411 and the inner wall of the mounting hole 212.

The two ends of the first connecting section 2411 are respectively connected with the edge constraint piece 230 and the second connecting section 2412, one end of the second connecting section 2412 is connected with the first connecting section 2411, the other end of the second connecting section 2412 penetrates out of the mounting hole 212 from one side far away from the mounting surface 211 and is detachably matched with the adjusting part 242, when the protruding distance of the edge constraint piece 230 relative to the mounting surface 211 needs to be changed, the adjusting part 242 is removed from the second connecting section 2412, after the axial position of the connecting part 241 in the mounting hole 212 is changed, the adjusting part 242 is assembled on the connecting part 241 and is abutted with one side of the mounting main body 210 away from the mounting surface 211, and the fixing of the position of the connecting part 241 is realized.

The first and second connection segments 2411, 2412 are different in outer diameter and the outer diameter of the first connection segment 2411 is greater than the outer diameter of the second connection segment 2412. When the first connecting segment 2411 and the second connecting segment 2412 are cylindrical, the first connecting segment 2411 forms a stepped surface facing the second connecting segment 2412 at the connecting portion 241, which corresponds to the diameter of the first connecting segment 2411 being larger than the diameter of the second connecting segment 2412.

When the connecting portion 241 is installed in the mounting hole 212, because the outer diameter of the second connecting section 2412 is smaller, when the first connecting section 2411 abuts against the wall of the mounting hole 212, a gap exists between the second connecting section 2412 and the wall of the mounting hole 212, the elastic member 250 is sleeved on the second connecting section 2412 and located in the gap, one end of the elastic member is connected with the step surface of the first connecting section 2411, and the other end of the elastic member abuts against the inner wall of the mounting hole 212 facing the step surface, so that the elastic member 250 generates an elastic constraint force along the axis of the mounting hole 212.

In some embodiments, optionally, the adjusting portion 242 is sleeved on the second connecting section 2412 and is detachably connected with the second connecting section 2412 by threads.

The outer periphery of the second connecting section 2412 is provided with an external thread, the adjusting part 242 is provided with an internal thread, the adjusting part 242 and the second connecting section 2412 can form a bolt and nut matching structure through matching of the internal thread and the external thread, the adjusting part 242 is sleeved on the part of the second connecting section 2412 extending out of the mounting hole 212 from one side of the mounting main body 210, which is away from the mounting surface 211, and is abutted with one side of the mounting main body 210, which is away from the mounting surface 211, so as to limit the position of the connecting part 241.

It will be appreciated that as the axial position of the connection portion 241 within the mounting hole 212 changes, the length of the portion of the second connection segment 2412 that extends from the side of the mounting body 210 facing away from the mounting surface 211 also changes.

In this way, by the screw connection, the position adjustment of the connecting portion 241 in the mounting hole 212 of the mounting main body 210 is conveniently achieved.

In some embodiments, optionally, the edge restraints 230 include a plurality of edge restraints 230, and the plurality of edge restraints 230 are uniformly spaced circumferentially about the periphery of the kneading head 220.

It will be appreciated that each edge constraint 230 corresponds to an adjustment member 240, a mounting hole 212 and a resilient member 250, such that the position of each edge constraint 230 is adjustable. Each edge constraint 230 may protrude relative to the mounting face 211 to constrain the edge end 251 of the tab 25.

When the rubbing flat head 220 rotates to rub the plurality of tabs 25, the plurality of edge restraints 230 sequentially restrain and reshape the edge ends 251 of the plurality of tabs 25, thereby achieving a uniform harvest effect.

Generally, the number of the edge restraints 230 may be 3 to 6, and in other embodiments, other numbers may be provided, which is not limited herein.

In some embodiments, only one edge constraint 230 may be provided, and the entire circumference of the kneading head 220 may be entirely surrounded and may be entirely protruded with respect to the mounting surface 211. The present application provides for a plurality of edge restraints 230 that can be implemented for each individual control while also facilitating processing.

In some embodiments, optionally, the restraining surface 231 is arcuate and the edge restraints 230 are rotatable relative to the mounting body 210.

The edge constraint piece 230 may be spherical or cylindrical with a spherical end, and during the process of rubbing the tab 25 with the flat head 220, the edge constraint piece 230 may rotate relative to the connection portion 241, so that the arc-shaped constraint surface 231 rotates relative to the mounting body 210 and the tab 25, and thus, by rolling, the risk of metal particles being generated on the tab 25 during the rubbing process is reduced.

Specifically, the rotational connection manner of the edge constraint member 230 and the second connection segment 2412 is not limited, for example, the edge constraint member 230 may be directly configured into a sphere, a rolling groove is provided at the end of the second connection segment 2412, the sphere-shaped edge constraint member 230 is directly rolled in the rolling groove and can roll freely along the circumferential direction, and the entire outer surface of the edge constraint member 230 may form the constraint surface 231.

In some embodiments, the rubbing plane 221 is optionally tapered.

The cone-shaped tip of the rubbing flat 221 is located at a side far from the mounting surface 211, and the side having the largest diameter is connected with the mounting surface 211, thereby forming the entire cone-shaped rubbing flat head 220, and the cone-shaped rubbing flat 221 rolls the tab 25 flat as the rubbing flat head 220 rotates.

It will be appreciated that the edge restraints 230 are located on the side of the mounting face 211 adjacent to the side of the rubbing flat heads 220 where the diameter is greatest, and that the tips of the rubbing flat heads 220 are located adjacent to the geometric center of the end face 24 of the electrode assembly 23 such that the rubbing flat heads 220 are rotated one revolution relative to the end face 24, i.e., the rubbing of all the tabs 25 is completed.

According to some embodiments of the present application, please refer to fig. 8 and (a) - (d) in fig. 9, the present application provides a tab rolling control method, and the tab rolling device in the above embodiments is adopted, and the method includes the following steps:

s100, controlling the lug rubbing structure 200 to move towards one side of the lug 25 of the electrode assembly 23, so that a rubbing plane 221 of the rubbing flat head 220 and a restraining surface 231 of the edge restraining piece 230 are respectively and correspondingly abutted against a surface 252 and an edge end 251 of the lug;

and S200, controlling the lug rubbing structure 200 to rotate circumferentially or spirally around the axial direction of the electrode assembly 23.

In step S100, the tab rolling structure 200 is controlled to move toward one side of the tab 25, and various implementations may be implemented, for example: the pole ear rubbing structure 200 is driven to be in order to be close to the pole ear 25 by using equipment with telescopic functions such as an air cylinder, a hydraulic cylinder or an oil cylinder; alternatively, the movement of the tab balancing structure 200 may be achieved by a motor and transmission mechanism, such as: a motor and screw rod slide block combined structure, a motor and gear and rack combination and the like.

Before the kneading, the kneading plane 221 and the constraint surface 231 need to be respectively abutted against the surface 252 and the edge end 251 of the tab, so that the kneading of the tab 25 can be realized and the edge of the tab 25 is also constrained. The contact between the kneading plane 221 and the constraint surface 231 may be implemented in various ways, for example: before the constraint surface 231 abuts against the edge end 251, the axial position of the connecting portion 241 in the mounting hole 212 can be adjusted by the adjusting portion 242, so that the protruding distance of the edge constraint member 230 relative to the mounting surface 211 can be changed, and the edge constraint member can abut against the edge end 251 while the rubbing plane 221 abuts against the surface 252 of the tab. When the elastic member is disposed at the connection portion 241 and one end is connected to the edge constraint member 230, the adjustment portion 242 can also adjust the abutment force of the constraint surface 231 on the edge end portion 251 of the tab 25, for example: when the protruding distance of the edge restraining member 230 from the mounting surface 211 is increased, if the restraining surface 231 abuts against the edge end 251 of the tab 25, the amount of compression of the elastic member can be increased, and the abutting force of the restraining surface 231 against the edge end 251 can be increased.

In addition, in step S100, the middle portion of the electrode assembly 23 may be fixed by the fixing jig 300, so that stable rolling is facilitated. To increase the rubbing efficiency, the tab rubbing structures 200 may be provided at both upper and lower sides of the electrode assembly 23 so as to rub the upper and lower tabs 25 simultaneously.

In step S200, during the rubbing process, the tab rubbing structure 200 is driven to perform a circular motion around the axis of the electrode assembly 23; the lug kneading structure 200 can be driven to move in a feeding way towards one side of the lug 25 while performing circular motion, so as to form spiral rotation. Of course, the kneading heads 220 may also rotate about their own axes.

By the design, the edge end 251 of the tab 25 can be restrained while the tab 25 is kneaded, the kneaded tab 25 is limited in a safety range, the possibility that the burrs are overlapped with other parts of the battery 100 is reduced, and the reliability of the battery 100 is improved.

Referring to fig. 10, S200, the step of controlling the tab balancing structure 200 to rotate circumferentially or spirally around the axial direction of the electrode assembly 23 includes:

s210, controlling the tab smoothing structure 200 to rotate around the axial direction of the electrode assembly 23, so that the rotating speed of the tab smoothing structure 200 reaches a set rotating speed;

S220, controlling the lug rubbing structure 200 to move towards one side of the lug 25.

In step S210, the set rotation speed refers to a certain rotation speed value that the tab flattening structure 200 needs to achieve in order to achieve the flattening effect, and the rotation speed value may be set according to the material of the actual tab 25 and the flattening process.

In step S220, after the set rotational speed condition is met, the tab balancing structure 200 may be controlled to feed toward the electrode assembly 23 such that the tab 25 is pressed down by a certain amount. In some embodiments, after the tab 25 is flattened, the edge end 251 of the tab 25 is lower than the surface 252 of the tab, and a step structure is formed therebetween, such as: the edge end 251 of the tab 25 is 1 mm-2 mm below the surface of the tab.

By means of the design, the action of the lug flattening structure 200 is reasonably controlled, so that the lug 25 is flattened more stably, and the flattening effect is better.

According to some embodiments of the present application, there is provided a battery production system including the tab leveling device of any one of the above.

According to some embodiments of the present application, referring to fig. 4 to 7, a tab flattening device is provided, and the tab flattening device includes a driving member and a tab flattening structure 200. The tab rubbing structure 200 includes a mounting body 210, a rubbing flat head 220 and an edge constraint member 230, the mounting body 210 has a mounting surface 211, the rubbing flat head 220 forms a cone-shaped rubbing plane 221, the edge constraint member 230 includes a plurality of rubbing flat heads 220 circumferentially surrounding the periphery of the rubbing flat head 220, the entire tab rubbing structure 200 can circumferentially rotate, and the rubbing flat head 220 can circumferentially rotate relative to the mounting body 210, so that while the tab on the end surface 24 side of the electrode assembly 23 is rubbed flat, the edge end 251 of the tab 25 is constrained and limited by a constraint surface 231 protruding from the mounting surface 211 through the edge constraint member 230, and the possibility that the burr of the tab overlaps other parts of the battery 100 is reduced.

Simultaneously, the adjusting piece 240 and the elastic piece 250 are arranged, the adjusting piece 240 adjusts the protruding distance of the edge restraining piece 230 relative to the mounting surface 211, and meanwhile, the elastic piece 250 applies elastic restraining force to the tab 25 through the edge restraining piece 230, so that the phenomenon of decarburizing and lithium precipitation of the electrode assembly 23 caused by overlarge rigid pressure is relieved.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution 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 scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. The utility model provides a utmost point ear rub flat device which characterized in that includes:

a driving member;

the tab rubbing structure is driven by the driving member and rotates circumferentially or spirally around the axial direction of the electrode assembly, and includes:

a mounting main body;

the rubbing flat head is arranged on the mounting main body and protrudes from one side of the mounting main body, and the outer surface of the rubbing flat head forms a rubbing plane which can be contacted with the surface of the tab; and

and the edge restraint piece is arranged on the periphery of the rubbing flat head, protrudes relative to one side of the mounting main body and forms a restraint surface capable of contacting with the edge end part of the tab.

2. The tab flattening apparatus according to claim 1, wherein the mounting body has a mounting surface, and the flattening heads and the edge restraints are each protruded with respect to the mounting surface;

the tab rubbing structure further comprises an adjusting piece, wherein the adjusting piece is connected with the edge constraint piece and used for adjusting the protruding distance of the edge constraint piece relative to the mounting surface.

3. The tab leveling device according to claim 2, wherein the mounting body has a mounting hole communicating with the mounting surface, the adjusting member includes a connecting portion and an adjusting portion, the connecting portion is disposed in the mounting hole in a penetrating manner and is connected to the edge restraining member at one side of the mounting surface, and the adjusting portion is disposed at one side of the connecting portion away from the edge restraining member;

The adjusting part is used for adjusting the axial position of the connecting part in the mounting hole.

4. The tab flattening apparatus according to claim 3, wherein the tab flattening structure further comprises an elastic member, one end of which is connected to the connection portion, the elastic member being capable of applying an elastic constraint force to the tab through the edge constraint member.

5. The tab balancing device of claim 4, wherein the connection portion comprises a first connection section and a second connection section connected to each other;

the other end of the first connecting section is connected with the edge constraint piece, one end part of the second connecting section extends out of the mounting hole, and the adjusting part is detachably sleeved on the part of the second connecting section penetrating out of the mounting hole and can be abutted with one side of the mounting main body, which is away from the mounting surface;

the elastic piece is sleeved on the periphery of the second connecting section, and two ends of the elastic piece are respectively abutted to the inner walls of the first connecting section and the mounting hole.

6. The tab leveling device of claim 5, wherein the adjusting portion is sleeved on the second connecting section and is detachably connected with the second connecting section through threads.

7. The tab flattening apparatus according to claim 1, wherein the edge restraining members include a plurality of the edge restraining members, and the plurality of the edge restraining members are circumferentially spaced uniformly around the periphery of the flattening head.

8. The tab flattening apparatus of claim 1, wherein the constraint surface is arcuately configured and the edge constraint member is rotatable relative to the mounting body.

9. The tab flattening apparatus of claim 1, wherein the rubbing plane is cone-shaped.

10. A tab flattening control method, characterized in that a tab flattening device according to any one of claims 1-9 is used, the method comprising the steps of:

the electrode lug rubbing structure is controlled to move towards one side of the electrode lug of the electrode assembly, so that a rubbing plane of the rubbing flat head and a restraint surface of the edge restraint are respectively and correspondingly abutted against the surface and the edge end part of the electrode lug;

and controlling the lug kneading structure to rotate circumferentially or spirally around the axial direction of the electrode assembly.

11. The tab balancing control method according to claim 10, wherein the step of controlling the tab balancing structure to be rotated circumferentially or spirally around the axial direction of the electrode assembly comprises:

Controlling the lug rubbing structure to rotate around the axial direction of the electrode assembly, so that the rotating speed of the lug rubbing structure reaches a set rotating speed;

and controlling the lug kneading structure to move towards one side of the lug.

12. A battery production system, characterized in that it comprises the tab leveling device according to any one of claims 1 to 9.