CN219123345U

CN219123345U - End cover assembly, battery monomer, preparation equipment of battery monomer, battery and power utilization device

Info

Publication number: CN219123345U
Application number: CN202222804018.XU
Authority: CN
Inventors: 陈新祥; 林蹬华; 郑于炼; 王鹏; 金海族
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2021-10-25
Filing date: 2022-10-24
Publication date: 2023-06-02
Anticipated expiration: 2032-10-24
Also published as: CN117461193A; WO2023070288A1

Abstract

The application provides an end cover subassembly, battery monomer and preparation equipment, battery and power consumption device thereof, end cover subassembly includes: the end cover is provided with a first electrode lead-out hole, the end cover is provided with a first positioning structure surrounding the first electrode lead-out hole, the first positioning structure is provided with a first bulge facing the inside of the battery cell along the thickness direction of the end cover, and a first groove is formed on one side of the first bulge facing away from the inside of the battery cell; the insulating component is arranged on one side of the end cover, which is away from the inside of the battery cell, and is provided with a second electrode lead-out hole corresponding to the first electrode lead-out hole, the insulating component is provided with a second positioning structure, the second positioning structure is provided with a second bulge matched with the first groove, and the first electrode lead-out hole and the second electrode lead-out hole are used for leading out an electrode terminal; the sealing piece is used for sealing the first electrode leading-out hole and is arranged in the first electrode leading-out hole and the second electrode leading-out hole; the first positioning structure and the second positioning structure are used for pressing the sealing piece in the direction perpendicular to the thickness of the end cover.

Description

End cover assembly, battery monomer, preparation equipment of battery monomer, battery and power utilization device

Cross Reference to Related Applications

This patent document claims the priority and benefit of PCT patent application No. PCT/CN2021/126216 filed on 25 th 10 th 2021, entitled "end cap assembly, battery cell, and method of making same, battery and electric device". The entire contents of the above-mentioned patent application are incorporated by reference as part of the disclosure of this patent document.

Technical Field

The application relates to the technical field of batteries, in particular to an end cover assembly, a battery monomer, preparation equipment of the battery monomer, a battery and an electric device.

Background

Batteries are widely used as important energy conversion devices in the fields of electronic devices, vehicles and the like, and with the development of battery technology, battery life is a non-negligible problem in addition to improving the energy density of batteries.

The sealability of the battery cell has an important influence on the life of the battery, for example, when the sealability of the battery is poor, leakage or gas leakage of the battery may be caused, thereby reducing the life of the battery and affecting the electrochemical performance of the battery. Therefore, how to improve the sealing performance of the battery is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides an end cover assembly, a battery monomer, a battery, an electricity utilization device and battery monomer preparation equipment, which can effectively improve the sealing performance of the battery monomer, thereby improving the service life and chemical performance of the battery.

In a first aspect, embodiments of the present application provide an end cap assembly comprising: the end cover is provided with a first electrode lead-out hole, the end cover is provided with a first positioning structure surrounding the first electrode lead-out hole, the first positioning structure is provided with a first bulge facing the inside of the battery cell along the thickness direction of the end cover, and a first groove is formed on one side of the first bulge facing away from the inside of the battery cell; the insulating member is arranged on one side of the end cover, which is away from the inside of the battery cell, and is provided with a second electrode lead-out hole corresponding to the first electrode lead-out hole, the insulating member is provided with a second positioning structure, the second positioning structure is provided with a second bulge matched with the first groove, and the first electrode lead-out hole and the second electrode lead-out hole are used for leading out an electrode terminal; the sealing piece is used for sealing the first electrode lead-out hole and is arranged in the first electrode lead-out hole and the second electrode lead-out hole; wherein the first and second locating structures are configured to press against the seal in a direction perpendicular to the thickness of the end cap.

In the embodiment, the first positioning structure is arranged around the first electrode leading-out hole of the end cover, the second positioning structure matched with the first positioning structure is arranged around the second electrode leading-out hole of the insulating member, on one hand, the first positioning structure is matched with the second positioning structure, so that accurate positioning in the assembly process of the end cover assembly is facilitated, and the probability of offset generated in the assembly process of the end cover assembly is reduced; on the other hand, the cooperation of first location structure and second location structure makes the sealing member that sets up in first electrode extraction hole and second electrode extraction hole be supported by first location structure and second location structure simultaneously in the direction of perpendicular to end cover thickness, increased the area that the sealing member was supported in perpendicular to end cover thickness direction, when electrode terminal received the external force of perpendicular to end cover thickness direction, first location structure and second location structure bore this external force of being passed by the sealing member jointly, compare in the condition that the sealing member only received the end cover to support the pressure, the sealing member is increased in the atress area of this direction, the possibility of deformation or dislocation reduces, thereby reduced the probability that electrode terminal weeping gas leakage, effectively promote life-span and the electrochemical performance of battery.

In some embodiments, the thickness of the bottom wall of the first recess is equal to the thickness of the end cap.

In this embodiment, the bottom wall of the first groove and the end cover have the same thickness, that is, the first groove is directly processed through a stamping process, no complicated preparation process is needed, the process is simple and convenient to produce, and the production efficiency of the end cover assembly is improved.

In some embodiments, the thickness of the bottom wall of the first recess is less than the thickness of the end cap.

In this embodiment, the thickness of the bottom wall of the first groove is smaller than the thickness of the end cover, that is, the first groove can be obtained by machining through cutting processes, no complicated preparation process is needed, the process is simple and convenient to produce, and the production efficiency of the end cover assembly is improved.

In some embodiments, the end cap assembly further comprises: a metal terminal plate arranged on one side of the insulating member, which is away from the end cover, the metal terminal plate being used for being connected with the electrode terminal, and a third positioning structure being arranged on one side of the metal terminal plate, which is towards the insulating member; wherein, one side of insulating component far away from the end cover is provided with the fourth location structure of third location structure complex.

In some embodiments, the third positioning structure is a mesa-like bump structure.

In this embodiment, the metal terminal plate is provided with a third positioning structure facing the insulating member, and the insulating member is provided with a fourth positioning structure cooperating with the third positioning structure. On the one hand, the alignment and positioning of the metal terminal plate and the insulating member in the assembly process of the end cover assembly are facilitated by the matching of the third positioning structure and the fourth positioning structure, and the assembly efficiency of the end cover assembly is improved; on the other hand, the third positioning structure with the mesa-shaped bulge structure is made of metal, and stretches into the fourth positioning structure of the insulating member matched with the third positioning structure, so that the strength of the insulating member can be enhanced, the matching strength between the second positioning structure of the insulating member and the first positioning structure of the end cover is enhanced, when the electrode terminal is subjected to external force, the deformation resistance of the end cover assembly in the direction perpendicular to the thickness direction of the end cover is enhanced, the possibility of deformation or dislocation of the sealing element is reduced, the probability of leakage of liquid and air leakage of the electrode terminal is reduced, and the service life and safety performance of the battery are improved.

In some embodiments, the first locating structure is polygonal in shape on the surface of the end cap.

In this embodiment, the first positioning structure may be polygonal on the surface of the end cover, for example, triangular, rectangular, hexagonal, etc., so that when only one electrode terminal is disposed on the end cover, the polygonal first positioning structure can help resist an external force that twists the electrode terminal perpendicular to the thickness direction of the end cover, thereby improving the deformation resistance of the end cover assembly and helping to improve the sealing performance of the battery cell.

In some embodiments, the end cap has a plurality of the first electrode lead-out holes corresponding to the same electrode of the battery cell, and the first positioning structure is circular in shape on a surface of the end cap.

In this embodiment, when the end cover has a plurality of electrode terminals corresponding to the same electrode, the first positioning structure may be a circle that is convenient for processing, and at this time, the plurality of circular positioning structures may cooperate with each other, resist external force that twists the electrode terminals perpendicular to the thickness direction of the end cover, and improve deformation resistance of the end cover assembly, and meanwhile, be convenient for production and preparation.

In some embodiments, the first positioning structure has a height in the thickness direction of the end cap that is 1.33-10 times the thickness of the end cap.

In some embodiments, the insulating member is provided with a third protrusion in the second electrode lead-out hole for pressing the seal in the end cap thickness direction.

In this embodiment, the insulating member has the third arch in the second electrode draws forth the hole, can support the pressure sealing member at end cover thickness direction, thereby can avoid electrode terminal to receive when pulling along end cover thickness direction's external force, thereby the sealing member produces the displacement in end cover thickness direction and causes the sealing member to shift, has further strengthened the sealing performance of end cover subassembly.

In a second aspect, embodiments of the present application provide a battery cell, including: an electrode assembly; a case having an opening for accommodating the electrode assembly; the end cover assembly provided by the embodiment of the application covers the opening so as to seal the electrode assembly in the shell.

In some embodiments, the end cap of the end cap assembly is the wall of the largest area of the cell.

In a third aspect, embodiments of the present application provide a battery, including a battery cell provided in embodiments of the present application.

In a fourth aspect, embodiments of the present application provide an electrical device, including a battery provided by embodiments of the present application, where the battery is configured to supply power to the electrical device.

In a fifth aspect, an embodiment of the present application provides a method for preparing a battery monomer, including: providing an electrode assembly; providing a case having an opening for accommodating the electrode assembly; providing an end cap assembly, the end cap assembly comprising: the battery cell comprises an end cover, an insulating member and a sealing piece, wherein the end cover is provided with a first electrode leading-out hole, the end cover is provided with a first positioning structure surrounding the first electrode leading-out hole, the first positioning structure is provided with a first bulge facing the inside of the battery cell along the thickness direction of the end cover, and one side of the first bulge facing away from the inside of the battery cell is provided with a first groove; the insulating member is arranged on one side of the end cover, which is far away from the inside of the battery cell, and is provided with a second electrode lead-out hole corresponding to the first electrode lead-out hole, the insulating member is provided with a second positioning structure, the second positioning structure is provided with a second bulge matched with the first groove, and the first electrode lead-out hole and the second electrode lead-out hole are used for leading out an electrode terminal; the sealing piece is used for sealing the first electrode lead-out hole and is arranged in the first electrode lead-out hole and the second electrode lead-out hole; the first positioning structure and the second positioning structure are used for pressing the sealing piece in the direction perpendicular to the thickness of the end cover; the opening is covered with the end cap assembly to enclose the electrode assembly in the case.

In a sixth aspect, there is provided an apparatus for preparing a battery cell, comprising: a providing module for providing an electrode assembly; providing a case having an opening for accommodating the electrode assembly; providing an end cap assembly, the end cap assembly comprising: an end cap, an insulating member, and a seal; the end cover is provided with a first electrode leading-out hole, the end cover is provided with a first positioning structure surrounding the first electrode leading-out hole, the first positioning structure is provided with a first bulge facing the inside of the battery cell along the thickness direction of the end cover, and a first groove is formed on one side of the first bulge facing away from the inside of the battery cell; the insulating member is arranged on one side of the end cover, which is far away from the inside of the battery cell, and is provided with a second electrode lead-out hole corresponding to the first electrode lead-out hole, the insulating member is provided with a second positioning structure, the second positioning structure is provided with a second bulge matched with the first groove, and the first electrode lead-out hole and the second electrode lead-out hole are used for leading out an electrode terminal; the sealing piece is used for sealing the first electrode lead-out hole and is arranged in the first electrode lead-out hole and the second electrode lead-out hole; the first positioning structure and the second positioning structure are used for pressing the sealing piece in the direction perpendicular to the thickness of the end cover; a mounting module for covering the opening with the end cap assembly to enclose the electrode assembly in the case.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and that other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of an electric device of the present application.

Fig. 2 is a schematic structural view of a battery itself.

Fig. 3 is a schematic exploded view of a battery cell of the present application.

FIG. 4 is a schematic block diagram of an end cap assembly of the present application.

Fig. 5 is a schematic cross-sectional view of an end cap assembly of the present application.

Fig. 6 is a cross-sectional view of an end cap of the present application in the thickness direction.

Fig. 7 is a cross-sectional view of another end cap of the present application in the thickness direction.

Fig. 8 is a schematic cross-sectional view of an end cap assembly of the present application.

Fig. 9-11 are schematic views of several end cap assemblies of the present application mounted to a battery cell.

Fig. 12 is a schematic flow chart of a method of preparing a battery cell according to the present application.

Fig. 13 is a schematic structural body of a manufacturing apparatus of a battery cell.

In the drawings, the drawings are not drawn to scale.

Detailed Description

Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the present application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.

In the description of the present application, it is to be noted that, unless otherwise indicated, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like indicate an orientation or positional relationship merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The "vertical" is not strictly vertical but is within the allowable error range. "parallel" is not strictly parallel but is within the tolerance of the error.

The directional terms appearing in the following description are all directions shown in the drawings and do not limit the specific structure of the present application. In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the present application can be understood as appropriate by one of ordinary skill in the art.

The term "and/or" in this application is merely an association relation describing an associated object, and indicates that three relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In this application, the character "/" generally indicates that the associated object is an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and in the interest of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the present application, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are illustrative only and should not be construed as limiting the present application in any way.

The term "plurality" as used herein refers to more than two (including two).

In the present application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited by the embodiment of the present application. The battery cell may be in a round body, a flat body, a rectangular parallelepiped, or other shape, etc., which is not limited in this embodiment. The battery cells are generally classified into three types according to the packaging method: the cylindrical battery cell, the square battery cell and the soft pack battery cell are not limited thereto.

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, or the like. The battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly consists of a positive plate, a negative plate and a separation membrane. The battery cell mainly relies on metal ions to move between the positive and negative electrode plates to operate. The positive plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the current collector without the positive electrode active material layer protrudes out of the current collector coated with the positive electrode active material layer, and the current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the current collector without the negative electrode active material layer protrudes out of the current collector with the coated negative electrode active material layer, and the current collector without the negative electrode active material layer is used as a negative electrode tab. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. In order to ensure that the high current is passed without fusing, the number of positive electrode lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together. The material of the diaphragm can be PP or PE. In addition, the electrode assembly may be a wound structure or a lamination structure, and the embodiment of the present application is not limited thereto.

The case of the battery in the embodiment of the application is used for accommodating a plurality of battery cells, a confluence part and other parts of the battery. In some embodiments, a structure for fixing the battery cell may be further provided in the case. The shape of the case may be determined according to the plurality of battery cells received. In some embodiments, the case may be square with six walls.

The bus bar component mentioned in this application is used to achieve an electrical connection between a plurality of battery cells, for example parallel or series-parallel. The bus member may realize electrical connection between the battery cells by connecting electrode terminals of the battery cells. In some embodiments, the bus member may be fixed to the electrode terminals of the battery cells by welding.

The electrode terminal and the end cover of the battery cell are assembled in a riveting mode, and the electrode terminal are aligned and positioned only, so that a sealing element for sealing the electrode lead-out hole is easily displaced or deformed once the electrode terminal and the electrode terminal are offset in the assembly process; in addition, when the electrode terminal is subjected to external force perpendicular to the thickness of the end cover, the sealing member is only in contact with the end cover with a thinner thickness in the direction perpendicular to the thickness of the end cover, and the sealing member is easily displaced, so that the sealing performance and the electrochemical performance of the battery cell are seriously affected.

In view of this, the embodiment of the application provides an end cover assembly, a battery cell, a battery, an electric device, a preparation method of the battery cell and a preparation device of the battery cell, wherein a groove is arranged on the end cover, and a protrusion is arranged on an insulating member to improve the sealing performance of the battery cell, so that the service life and the chemical performance of the battery are improved.

It should be understood that the respective components in the case of the battery described above should not be construed as limiting the embodiments of the present application, that is, the case for the battery of the embodiments of the present application may or may not include the above-described components.

The technical solutions described in the embodiments of the present application are applicable to various devices using batteries, for example, mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, vehicles, ships, spacecraft, and the like, and for example, spacecraft include airplanes, rockets, space shuttles, 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 a vehicle as an example.

For example, as shown in fig. 1, a schematic structural diagram of a vehicle 1 according to an embodiment of the present application, the vehicle 1 may be a fuel-oil vehicle, a gas-fired vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. The vehicle 1 may be provided with a motor 40, a controller 30 and a battery 10, the controller 30 being arranged to control the battery 10 to supply power to the motor 40. For example, the battery 10 may be provided at the bottom or the head or the tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, e.g. the battery 10 may be used as an operating power source for the vehicle 1, for electrical circuitry of the vehicle 1, e.g. for start-up, navigation and operational power requirements of the vehicle 1. In another embodiment of the present application, the battery 10 may not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 1.

To meet different power usage requirements, the battery 10 may include a plurality of battery cells. For example, fig. 2 is an exploded view of a battery 10 according to one embodiment of the present application, and the battery 10 may include a plurality of battery cells 20. 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 10 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.

Alternatively, the battery 10 may also include other structures. For example, the battery 10 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 battery 10 may further include a case (or cover) having a hollow structure therein, and a plurality of battery cells 20 are accommodated in the case. As shown in fig. 2, the case may include two parts, referred to herein as a first part 111 and a second part 112 (or may also be referred to as an upper case and a lower case), respectively, the first part 111 and the second part 112 being snapped together. The shape of the first and second members 111 and 112 may be determined according to the shape of the combination of the plurality of battery cells 20, at least one of the first and second members 111 and 112 having one opening. For example, the case may include only one of the first member 111 and the second member 112 in a hollow rectangular parallelepiped having an opening, and the other in a plate shape to cover the opening. For example, as shown in fig. 2, the second member 112 is a hollow rectangular parallelepiped and only one surface is an opening surface, and the first member 111 is a plate-like member, for example, and the first member 111 is covered at the opening of the second member 112 to form a case having a closed chamber that can be used to house a plurality of battery cells 20.

Alternatively, the first part 111 and the second part 112 included in the case in the embodiment of the present application may have other shapes, for example, each of the first part 111 and the second part 112 may be a hollow cuboid and only one surface of each of the first part 111 and the second part 112 is an open surface, the openings of the first part 111 and the second part 112 are disposed opposite to each other, and the first part 111 and the second part 112 are fastened to each other to form the case with a closed cavity. The plurality of battery cells 20 are connected in parallel or in series-parallel combination and then placed in a box formed by buckling the first component 111 and the second component 112.

For convenience of explanation, the case 11 shown in fig. 2 will be mainly described as an example, but the embodiment of the present application is not limited thereto.

As shown in fig. 3, which is an exploded view of a battery cell 20 according to the present application, the battery cell 20 accommodated in a case generally includes an end cap assembly 21, a case 22, and an electrode assembly 23, the case 22 having an opening for accommodating the electrode assembly 23, and the end cap assembly 21 covering the opening of the case 22 to enclose the electrode assembly 23 in the case.

In addition, the end cap assembly 21 is also electrically connected with the electrode assembly 23, so that the electrode assembly 23 can transmit electric power to the outside of the case 22 through the electrode terminals 210 of the end cap assembly 21, combined or assembled with other battery cells 20.

Optionally, the end cap assembly 21 is provided with an electrode lead-out hole 201, and the electrode terminal 210 is sealingly mounted in the electrode lead-out hole 201 by a seal 211 such that the electrode terminal 210 is riveted with the end cap 212.

It should be understood that the end cap 212 refers to the wall where the electrode terminal 210 is located among all the walls of the battery cell 20.

Optionally, end cap 212 is the wall of the largest area of cell 20.

The embodiment of the application provides an end cover assembly, which can effectively improve the sealing performance of a battery monomer, thereby prolonging the service life and improving the electrochemical performance of the battery.

As shown in fig. 4 and 5, which are schematic block and sectional views, respectively, of an end cap assembly of the present application, the end cap assembly 21 includes: end cap 212, insulating member 213, and seal 211.

The end cover 212 is provided with a first electrode lead-out hole 201 and a first positioning structure 2011 surrounding the electrode lead-out hole 201, the first positioning structure 2011 has a first protrusion 2011a facing the inside of the battery cell 20 along the thickness direction of the end cover 212, and the first protrusion 2011a is formed with a first groove 2011b at one side facing away from the inside of the battery cell 20.

The insulating member 213 is disposed on a side of the end cap 212 facing away from the inside of the battery cell 20, the insulating member 213 has a second electrode lead-out hole 202 corresponding to the first electrode lead-out hole 201, the insulating member 213 is provided with a second positioning structure 2012, the second positioning structure 2012 has a second protrusion 2012a mating with the first recess 2011b, and the first electrode lead-out hole 201 and the second electrode lead-out hole 202 are used for leading out the electrode terminal 210.

The sealing member 211 is used for sealing the first electrode lead-out hole 201 and is arranged in the first electrode lead-out hole 201 and the second electrode lead-out hole 202; the first positioning structure 2011 and the second positioning structure 2012 are used for pressing the sealing member 211 in a direction perpendicular to the thickness of the end cover 212.

That is, during the assembly process of the battery cell 20, the electrode terminal 210 needs to pass through the end cap 212 and the insulating member 213 which are matched with each other, and the seal 211 is located in the first electrode lead-out hole 201 and the second electrode lead-out hole 202, that is, the end cap 212 and the insulating member 213 can jointly bear the seal 211 through the first positioning structure 2011 and the second positioning structure 2012 in the direction perpendicular to the thickness of the end cap 212, so that, in the embodiment of the application, through the first positioning structure 2011 and the second positioning structure 2012 which are matched with each other, on one hand, the accurate positioning of the end cap assembly 21 during the assembly process is facilitated, the probability of generating offset during the assembly of the end cap assembly 21 is reduced, on the other hand, the area of the seal 211 which is pressed in the direction perpendicular to the thickness direction of the end cap 212 can be increased, and when the electrode terminal 210 is twisted by an external force perpendicular to the thickness direction of the end cap 212, the first positioning structure 2011 and the second positioning structure 2012 jointly bear the external force transmitted by the seal 211, compared with the case that the seal 211 is pressed only by the end cap 212, the area of the seal 211 in the direction is increased, the probability of deformation or dislocation is reduced, thereby reducing the probability of the occurrence of the deformation or dislocation during the assembly, and the effective leakage performance of the battery 10 is reduced.

Optionally, the first positioning structure 2011 includes a plurality of first protrusions 2011a. Illustratively, the first protrusions 2011a of the first positioning structure 2011 are concentric circles with different radii on the surface of the end cap 212, and the center of the concentric circles is also the center of the first electrode lead-out hole 201. For another example, the first protrusions 2011a of the first positioning structure 2011 are formed on the surface of the end cover 212 in a plurality of geometric patterns with the same geometric center, and the geometric center is also the center of the first electrode lead-out hole 201.

It should be appreciated that when the face of the first locating structure 2011 facing the interior of the cell 20 on the end cap 212 includes a plurality of first protrusions 2011a, i.e., the face facing the exterior of the cell 20 includes a plurality of corresponding first recesses 2011b, the corresponding mating second locating structure 2012 includes a plurality of second protrusions 2012a on the face facing the cell 20.

Preferably, the thickness of the bottom wall of the first recess 2011b is equal to the thickness of the end cap 212.

Specifically, as shown in fig. 6, the end cap 212 is a cross-sectional view in the thickness direction. The end cap 212 has a thickness H1, the bottom wall of the first groove 2011b has a thickness H2 and h1=h2, and the depth of the first groove 2011b in the thickness direction is H.

In this embodiment, h1=h2, i.e. the first groove 2011b can be directly machined by stamping the end cap 212 through design, so that no complicated preparation process is needed, the process is simple and convenient for production, and the production efficiency of the end cap assembly 21 is improved.

Optionally, the thickness of the bottom wall of the first recess 2011b is less than the thickness of the end cap 212. Specifically, as shown in fig. 7, there is another cross-sectional view of the end cap 212 in the thickness direction.

In this embodiment, h1 > h2, that is, the first groove 2011b can be directly machined by cutting the end cover 212, so that a complicated preparation process is not needed, the process is simple and the production is convenient, and the production efficiency of the end cover assembly 21 is improved.

Optionally, as shown in fig. 4 or 8, the end cap assembly 21 further includes: a metal terminal plate 214, the metal terminal plate 214 being disposed at a side of the insulating member 213 facing away from the end cap 212 for connection with the electrode terminal 210. The side of the metal terminal plate 214 facing the insulating member 213 is provided with a third positioning structure 2013, and the side of the insulating member 213 facing away from the end cap 212 is provided with a fourth positioning structure 2014 cooperating with the third positioning structure 2013.

Optionally, as shown in fig. 8, the third positioning structure 2013 is a bump structure 2013a. That is, the third positioning structure 2013 is a bump structure in a section along the thickness direction of the end cap 212, and correspondingly, the fourth positioning structure 2014 is a groove structure 2014a in a section along the thickness direction of the end cap 212.

Optionally, the third positioning structure 1031 is a bulbous or mesa-like bump structure. That is, the third positioning structure 1031 has a spherical or mesa-like ridge structure in a cross section along the thickness direction of the end cap 212, and correspondingly, the fourth positioning structure 2014 has a spherical or mesa-like groove structure in a cross section along the thickness direction of the end cap 212.

It should be appreciated that the third positioning structure 2013 may include only one mesa-like or bulbous protrusion structure 2013a, or may include a plurality of mesa-like or bulbous protrusion structures 2013a.

Optionally, the mesa-shaped or ball-shaped bump structures 2013a are in one-to-one correspondence with the second protrusions 2012a of the second positioning structure 2012. That is, one mesa-shaped or ball-shaped bump structure 2013a protrudes into only one second bump 2012a, and the number of mesa-shaped or ball-shaped bump structures 2013a of the third positioning structure 2013 is equal to the number of second bumps 2012a of the second positioning structure 2012. If the second positioning structure 2012 has only one second protrusion 2012a, the third positioning structure 2013 is provided with only one mesa-shaped or spherical bump structure 2013a, and one second positioning structure 2012 is provided with only one mesa-shaped or spherical bump structure 2013a to increase mechanical strength; if the second positioning structure 2012 has a plurality of second protrusions 2012a, the third positioning structure 2013 is provided with a plurality of mesa-shaped or spherical bump structures 2013a corresponding to the second protrusions 2012a, and one second positioning structure 2012 acts together by the plurality of mesa-shaped or spherical bump structures 2013a to increase mechanical strength.

Optionally, a plurality of the mesa-shaped or bulbous protrusion structures 2013a correspond to the second protrusions 2012a of one of the second positioning structures 2012. That is, a plurality of mesa-shaped or ball-shaped bump structures 2013a protrude into one second bump 2012a, the second positioning structures 2012 of the insulating member 213 are reinforced together, and the number of mesa-shaped or ball-shaped bump structures 2013a of the third positioning structures 2013 is greater than the number of second bumps 2012a of the second positioning structures 2012. If the second positioning structure 2012 has only one second boss 2012a, then the plurality of mesa-shaped or bulbous raised structures 2013a of the third positioning structure 2013 each extend into the second boss 2012 a; if the second positioning structure 2012 has a plurality of second protrusions 2012a, a plurality of mesa-shaped or spherical bump structures 2013a extending into each of the second protrusions 2012a are disposed in each of the second positioning structures 2012, and the second positioning structures 2012 cooperate with the plurality of mesa-shaped or spherical bump structures 2013a to increase mechanical strength.

In this embodiment, on one hand, the third positioning structure 2013 and the fourth positioning structure 2014 that are mutually matched facilitate alignment and positioning of the metal terminal plate 214 and the insulating member 213 in the assembly process of the end cover assembly 21, so as to improve the assembly efficiency of the end cover assembly 21; on the other hand, the third positioning structure 2013 with the protruding structure 2013a is made of metal and extends into the fourth positioning structure 2014 of the insulating member 213 matched with the third positioning structure 2013, so that the strength of the insulating member 213 can be enhanced, and the matching strength between the second positioning structure 2012 of the insulating member 213 and the first positioning structure 2011 of the end cover 212 is enhanced, so that when the electrode terminal 210 is subjected to an external force parallel to the surface direction of the end cover 212, the deformation resistance of the end cover assembly 21 in the direction perpendicular to the thickness direction of the end cover 212 is enhanced, the deformation or dislocation possibility of the sealing member 211 is reduced, the probability of leakage of the liquid and the gas of the electrode terminal 210 is reduced, and the service life and the electrochemical performance of the battery 10 are improved.

As shown in fig. 9, 10 and 11, an end cap assembly 21 having a first positioning structure 2011 with a different shape is schematically shown mounted to a battery cell 20.

Optionally, the shape of the first positioning structure 2011 on the surface of the end cap 212 is polygonal. Such as triangular, rectangular, hexagonal, etc.

In this embodiment, the first positioning structure 2011 is a polygon with an angular angle on the surface of the end cover 212, so that when only one electrode terminal 210 is disposed on the end cover 212, the polygonal first positioning structure 2011 can help resist the external force that twists the electrode terminal 210 perpendicular to the thickness direction of the end cover 212, thereby improving the deformation resistance of the end cover assembly 21 and improving the sealing performance of the battery cell 20. It should be appreciated that a direction perpendicular to the thickness of the end cap 212, i.e., a direction parallel to the surface of the end cap 212.

As shown in fig. 3, a schematic view of an end cap assembly 21 having a plurality of electrode lead-out holes 201 is shown mounted to a battery cell 20.

Alternatively, the end cap 212 has a plurality of the first electrode lead-out holes 201 corresponding to the same electrode of the battery cell 20, and the shape of the first positioning structure 2011 on the surface of the end cap 212 is circular.

In this embodiment, the battery unit 20 has a plurality of electrode terminals 210 corresponding to the same electrode, and the end cap 212 has a plurality of first electrode lead-out holes 201 corresponding to the same electrode, at this time, the first positioning structure 2011 may be a circle that is convenient for processing, and the plurality of circular first positioning structures 2011 can cooperate with each other to resist the external force that twists the electrode terminals 210 perpendicular to the thickness direction of the end cap 212, so as to improve the deformation resistance of the end cap assembly 21 and facilitate production and preparation.

Optionally, the height of the first positioning structure 2011 in the thickness direction of the end cap 212 is 1.33-10 times the thickness of the end cap 212.

Specifically, as shown in fig. 6 or fig. 7, the first positioning structure 2011 has a first protrusion 2011a along the thickness direction of the end cap 212 on a side of the end cap 212 facing the inside of the battery cell 20, and meanwhile, a first groove 2011b is formed on a side facing away from the inside of the battery cell 20, where the depth H of the first groove 2011b is the height of the first positioning structure 2011 along the thickness direction of the end cap 212, and 1.33×h1 is equal to or less than H is equal to or less than 10×h1.

For example, end cap 212 thickness h1=0.3 mm, first groove 2011b depth h=0.4 mm; for another example, end cap 212 has a thickness h1=0.1 mm and first recess 2011b has a depth h=1 mm.

According to the embodiment, through setting the depth range of the first groove 2011b, the problem that the mechanical strength of the thinner end cover 212 at the first electrode lead-out hole 201 is insufficient due to the overlarge depth of the first groove 2011b is avoided, and the problems that the positioning effect of the first positioning structure 2011 is not obvious and the processing is difficult due to the overlarge depth of the first groove 2011b are also avoided.

Alternatively, as shown in fig. 8, the insulating member 213 is provided with a third protrusion 2013b in the second electrode lead-out hole 202, the third protrusion 2013b being for pressing the seal 211 in the thickness direction of the end cap 212.

In this embodiment, the insulating member 213 has the third protrusion 2013b in the second electrode lead-out hole 201, and can press the seal member 211 in the thickness direction of the end cap 212, so as to prevent the seal member 211 from being displaced in the thickness direction of the end cap 212 when the electrode terminal 210 is pulled by an external force, thereby further enhancing the sealing performance of the end cap assembly 21.

Having described the end cap assembly 21, the battery cell 20, the battery 10, and the power utilization device of the embodiments of the present application, the method and apparatus for preparing the battery cell 20 of the embodiments of the present application will be described below, wherein the foregoing embodiments may be referred to for portions that are not described in detail.

As shown in fig. 12, an embodiment of the present application further provides a method for preparing a battery monomer 20, including:

s1001, providing an electrode assembly 23;

s1002, providing a case 22, the case 22 having an opening for accommodating the electrode assembly 23;

s1003, providing an end cap assembly 21, the end cap assembly 21 comprising: the battery cell 20 comprises an end cover 212, an insulating member 213 and a sealing piece 211, wherein the end cover 212 is provided with a first electrode lead-out hole 201, the end cover 212 is provided with a first positioning structure 2011 surrounding the first electrode lead-out hole 201, the first positioning structure 2011 is provided with a first bulge 2011a facing the inside of the battery cell 20 along the thickness direction of the end cover 212, and a first groove 2011b is formed on one side of the first bulge 2011a facing away from the inside of the battery cell 20; the insulating member 213 is disposed on a side of the end cap 212 facing away from the interior of the battery cell 20, the insulating member 213 has a second electrode lead-out hole 202 corresponding to the first electrode lead-out hole 201, the insulating member 213 is provided with a second positioning structure 2012, the second positioning structure 2012 has a second protrusion 2012a mating with the first recess 2011b, and the first electrode lead-out hole 201 and the second electrode lead-out hole 202 are used for leading out the electrode terminal 210; the sealing member 211 is used for sealing the first electrode lead-out hole 201 and is arranged in the first electrode lead-out hole 201 and the second electrode lead-out hole 202; the first positioning structure 2011 and the second positioning structure 2012 are used for pressing the sealing member 211 in a direction perpendicular to the thickness of the end cap 212;

S1004, covering the opening with the cap assembly 21 to enclose the electrode assembly 23 in the case 22.

As shown in fig. 13, an embodiment of the present application further provides a preparation apparatus 1100 of a battery cell 20, including:

a providing module 1101 for providing an electrode assembly 23; providing a case 22 having an opening for accommodating the electrode assembly 23; an end cap assembly 21 is provided, the end cap assembly 21 comprising: an end cap 212, an insulating member 213, and a seal 211; wherein the end cover 212 is provided with a first electrode lead-out hole 201, the end cover 212 is provided with a first positioning structure 2011 surrounding the first electrode lead-out hole 201, the first positioning structure 2011 is provided with a first protrusion 2011a facing the inside of the battery cell 20 along the thickness direction of the end cover 212, and a first groove 2011b is formed on one side of the first protrusion 2011a facing away from the inside of the battery cell 20; the insulating member 213 is disposed on a side of the end cap 212 facing away from the interior of the battery cell 20, the insulating member 213 has a second electrode lead-out hole 202 corresponding to the first electrode lead-out hole 201, the insulating member 213 is provided with a second positioning structure 2012, the second positioning structure 2012 has a second protrusion 2012a mating with the first recess 2011b, and the first electrode lead-out hole 201 and the second electrode lead-out hole 202 are used for leading out the electrode terminal 210; the sealing member 211 is used for sealing the first electrode lead-out hole 201 and is arranged in the first electrode lead-out hole 201 and the second electrode lead-out hole 202; the first positioning structure 2011 and the second positioning structure 2012 are used for pressing the sealing member 211 in a direction perpendicular to the thickness of the end cap 212;

A mounting module 1102 for covering the opening with the end cap assembly 21 to enclose the electrode assembly 23 in the case 22.

It should be noted that, on the premise of no conflict, the embodiments described in the present application and/or the technical features in the embodiments may be arbitrarily combined with each other, and the technical solutions obtained after the combination should also fall into the protection scope of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed systems and apparatuses may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices, or elements, or may be an electrical, mechanical, or other form of connection.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purposes of the embodiments of the present application.

While the present application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application. 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. An end cap assembly, comprising:

the end cover is provided with a first electrode lead-out hole, the end cover is provided with a first positioning structure surrounding the first electrode lead-out hole, the first positioning structure is provided with a first bulge facing the inside of the battery cell along the thickness direction of the end cover, and a first groove is formed on one side of the first bulge facing away from the inside of the battery cell;

the insulating member is arranged on one side of the end cover, which is away from the inside of the battery cell, and is provided with a second electrode lead-out hole corresponding to the first electrode lead-out hole, the insulating member is provided with a second positioning structure, the second positioning structure is provided with a second bulge matched with the first groove, and the first electrode lead-out hole and the second electrode lead-out hole are used for leading out an electrode terminal;

The sealing piece is used for sealing the first electrode lead-out hole and is arranged in the first electrode lead-out hole and the second electrode lead-out hole;

wherein the first and second locating structures are configured to press against the seal in a direction perpendicular to the thickness of the end cap.

2. The end cap assembly of claim 1, wherein the thickness of the bottom wall of the first groove is equal to the thickness of the end cap.

3. The end cap assembly of claim 1, wherein a thickness of a bottom wall of the first recess is less than a thickness of the end cap.

4. The end cap assembly of any one of claims 1-3, further comprising:

a metal terminal plate arranged on one side of the insulating member, which is away from the end cover, the metal terminal plate being used for being connected with the electrode terminal, and a third positioning structure being arranged on one side of the metal terminal plate, which is towards the insulating member;

wherein, one side of insulating component far away from the end cover is provided with the fourth location structure of third location structure complex.

5. The end cap assembly of claim 4, wherein the third positioning structure is a ridge structure.

6. The end cap assembly of any of claims 1-3, wherein the first locating structure is polygonal in shape on a surface of the end cap.

7. The end cap assembly of any one of claims 1-3, wherein the end cap has a plurality of the first electrode lead-out holes corresponding to the same electrode of the battery cell, the first positioning structure being circular in shape on a surface of the end cap.

8. The end cap assembly of any one of claims 1-3, wherein the first locating structure has a height in the thickness direction of the end cap that is 1.33-10 times the thickness of the end cap.

9. The end cap assembly of any one of claims 1-3, wherein the insulating member is provided with a third protrusion within the second electrode lead-out hole for pressing the seal member in a thickness direction of the end cap.

10. A battery cell, comprising:

an electrode assembly;

a case having an opening for accommodating the electrode assembly;

the end cap assembly of any one of claims 1-9, covering the opening to enclose the electrode assembly in the housing.

11. The battery cell of claim 10, wherein the end cap of the end cap assembly is the wall of the largest area of the battery cell.

12. A battery comprising a battery cell according to claim 10 or 11.

13. An electrical device comprising the battery of claim 12 for powering the electrical device.

14. A manufacturing apparatus of a battery cell, comprising:

a providing module for providing an electrode assembly; providing a case having an opening for accommodating the electrode assembly; providing an end cap assembly, the end cap assembly comprising: an end cap, an insulating member, and a seal; the end cover is provided with a first electrode leading-out hole, the end cover is provided with a first positioning structure surrounding the first electrode leading-out hole, the first positioning structure is provided with a first bulge facing the inside of the battery cell along the thickness direction of the end cover, and a first groove is formed on one side of the first bulge facing away from the inside of the battery cell; the insulating member is arranged on one side of the end cover, which is far away from the inside of the battery cell, and is provided with a second electrode lead-out hole corresponding to the first electrode lead-out hole, the insulating member is provided with a second positioning structure, the second positioning structure is provided with a second bulge matched with the first groove, and the first electrode lead-out hole and the second electrode lead-out hole are used for leading out an electrode terminal; the sealing piece is used for sealing the first electrode lead-out hole and is arranged in the first electrode lead-out hole and the second electrode lead-out hole; the first positioning structure and the second positioning structure are used for pressing the sealing piece in the direction perpendicular to the thickness of the end cover;

A mounting module for covering the opening with the end cap assembly to enclose the electrode assembly in the case.