CN118044059A - End cover assembly for battery cell, battery and electric equipment - Google Patents

End cover assembly for battery cell, battery and electric equipment Download PDF

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Publication number
CN118044059A
CN118044059A CN202280068051.0A CN202280068051A CN118044059A CN 118044059 A CN118044059 A CN 118044059A CN 202280068051 A CN202280068051 A CN 202280068051A CN 118044059 A CN118044059 A CN 118044059A
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CN
China
Prior art keywords
end cap
hollowed
battery
area
out area
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202280068051.0A
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Chinese (zh)
Inventor
周健
程启
周文林
李全坤
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Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Publication of CN118044059A publication Critical patent/CN118044059A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • H01M50/645—Plugs
    • H01M50/655—Plugs specially adapted for venting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The embodiment of the application provides an end cover assembly for a battery cell, the battery cell, a battery and electric equipment. The end cover assembly comprises an end cover, wherein a multifunctional hole is formed in the end cover and is used for injecting liquid and arranging a pressure release mechanism; the insulating piece is arranged on the inner side of the end cover facing the battery monomer, the insulating piece comprises a hollowed-out area and a non-hollowed-out area, the hollowed-out area is opposite to the multifunctional hole, and the hollowed-out area is located on the periphery of the non-hollowed-out area. According to the technical scheme provided by the embodiment of the application, the problem of lithium precipitation of the electrode assembly caused by injection of electrolyte to the electrode assembly in the battery preparation process can be avoided, so that the cycle performance of the battery is improved; meanwhile, the end cover assembly is simple in structure, and can reduce mechanical manufacturing difficulty and improve liquid injection efficiency.

Description

End cover assembly for battery cell, battery and electric equipment Technical Field
The application relates to the technical field of batteries, in particular to an end cover assembly for a battery, a battery monomer, the battery and electric equipment.
Background
With the increasing increase of environmental pollution, the new energy industry is receiving more and more attention. In the new energy industry, battery technology is an important factor in its development.
In the development of battery technology, how to improve the performance of a battery is a problem that needs to be solved in battery technology.
Disclosure of Invention
In view of the above problems, the embodiment of the application provides an end cover assembly for a battery cell, the battery cell, a battery and electric equipment, which can reduce the mechanical manufacturing difficulty and improve the liquid injection efficiency, thereby improving the performance of the battery.
In a first aspect, there is provided an end cap assembly for a battery cell, comprising an end cap provided with a multi-functional aperture for liquid injection and for providing a pressure relief mechanism; the insulating piece, the insulating piece set up in the end cover is towards the free inboard of battery, the insulating piece includes fretwork area and non-fretwork area, non-fretwork area with multi-functional hole sets up relatively, fretwork area is located non-fretwork area's periphery.
In the embodiment of the application, the multifunctional hole is arranged on the end cover and is used for injecting liquid and arranging the pressure release mechanism, namely, the liquid injection hole and the pressure release mechanism are integrated, so that the complexity of the structure of the end cover is reduced, and the manufacturing cost is reduced; the multifunctional holes are used for injecting liquid, and the larger holes are also beneficial to increasing the liquid injection efficiency. In addition, an insulating part is arranged on the inner side of the end cover facing the battery cell, and the insulating part comprises a non-hollowed-out area and a hollowed-out area, wherein the non-hollowed-out area is arranged opposite to the multifunctional hole, and the hollowed-out area is positioned on the periphery of the non-hollowed-out area. The non-hollowed-out area is opposite to the multifunctional hole, so that the liquid can be prevented from directly impacting the electrode assembly during liquid injection, and further the problems of lithium precipitation and the like can be avoided; the hollowed-out area is arranged on the periphery of the non-hollowed-out area, so that electrolyte can flow into the electrode assembly smoothly. Through setting up multi-functional hole and the insulating part of the relative non-fretwork area with multi-functional hole, can avoid in the battery preparation process, because of the lithium problem that separates that leads to of electrode assembly injection electrolyte, improve the cycle performance of battery and improve annotate liquid efficiency, and then when reducing battery machinery preparation degree of difficulty, improve the overall performance of battery.
In one possible embodiment, the insulator includes a recess and a body portion connected to the end cap, the recess and the multifunctional hole being disposed opposite each other with a space between a bottom wall of the recess and the end cap.
In the embodiment of the application, the insulating part is required to ensure that electrolyte can smoothly flow into the electrode assembly to maintain the normal function of the battery cell, and is required to prevent the problem of lithium precipitation of the electrode assembly caused by direct impact of the electrolyte on the electrode assembly in the process of filling the electrolyte. The insulating piece comprises a concave part and a main body part, wherein the concave part and the multifunctional hole are oppositely arranged, and a space is arranged between the bottom wall of the concave part and the end cover so as to form the concave part opposite to the multifunctional hole, so that the concave part can be used for avoiding the risk of electrolyte striking the electrode assembly during liquid injection; the body part may serve to connect the insulating member with the end cap, and insulate the electrode assembly from the end cap.
In one possible embodiment, the non-hollowed-out area is located in an area of the bottom wall corresponding to the multifunctional hole, and the hollowed-out area is located on a side wall of the bottom wall or the concave portion.
In the embodiment of the application, the hollowed-out area enables electrolyte to smoothly flow into the electrode assembly so as to maintain the normal function of the battery cell. The area corresponding to the multifunctional hole in the bottom wall is set to be a non-hollowed-out area, so that the problem of lithium precipitation of the electrode assembly caused by direct impact of electrolyte on the electrode assembly during liquid injection can be avoided, and the performance of the battery cell is improved; the hollow areas are arranged on the bottom wall and/or the side wall of the concave part, so that the normal discharge of gas in the battery monomer can be ensured, the normal function of the pressure release mechanism is not affected, the hollow areas can be used as electrolyte flow tunnels after liquid injection, and the electrolyte is uniformly distributed while the liquid injection rate is improved.
In one possible embodiment, the multifunctional hole is located at the center of the end cover in the width direction of the end cover, and the hollowed-out areas in the bottom wall are located at two sides of the non-hollowed-out area.
In the embodiment of the application, the multifunctional hole is positioned at the center of the end cover in the width direction, namely, the projection of the non-hollowed-out area on the concave part on the end cover is positioned at the center of the end cover in the width direction. In addition, the hollowed-out areas on the bottom wall of the concave part are positioned at two sides of the non-hollowed-out areas, so that the electrolyte can be prevented from flowing to one side only, and the uniform flow of the electrolyte is facilitated.
In one possible embodiment, the projection of the non-hollowed-out area on the end cover covers the multifunctional hole.
In the embodiment of the application, the multifunctional hole is used for injecting liquid and arranging the pressure relief mechanism, and the non-hollowed-out area is used for avoiding the impact risk to the electrode assembly during liquid injection. The projection of the non-hollowed-out area in the thickness direction of the end cover covers the multifunctional hole, namely, the area of the non-hollowed-out area is larger than that of the multifunctional hole, so that the protection effect of the non-hollowed-out area on the electrode assembly can be improved.
In one possible embodiment, the hollowed-out area includes through holes, and the total area of the through holes is larger than the area of the multifunctional holes.
In the embodiment of the application, the through holes in the hollowed-out area have the functions of enabling the battery monomer to be exhausted normally, not affecting the normal function of the pressure release mechanism, and improving the liquid injection rate as a flow tunnel of electrolyte after liquid injection. The total area of the through holes is larger than the area of the multifunctional holes, and the action effect of the hollowed-out area can be enhanced.
In one possible embodiment, the length direction of the through hole is parallel to the width direction of the end cap.
In the embodiment of the application, the through holes are arranged on the hollowed-out area, and further, the number of the through holes can be multiple. The length direction of the plurality of through holes is parallel to the width direction of the end cap, so that the electrolyte can be uniformly distributed in the electrode assembly.
In one possible embodiment, the length direction of the through hole is perpendicular to the width direction of the end cap.
In the embodiment of the application, the through holes are arranged on the hollowed-out area, and further, the number of the through holes can be multiple. The length direction of a plurality of through-holes is perpendicular to the width direction of end cover, more is favorable to annotating the liquid drainage back, lets electrolyte distribute more evenly, further increases annotates liquid efficiency.
In one possible embodiment, the pressure relief mechanism is welded to the end cap in an area around the multifunctional aperture facing the outside of the cell.
In the embodiment of the application, the pressure relief mechanism is welded with the multifunctional hole area of the end cover facing the outer side of the battery cell, namely the pressure relief mechanism is welded with the end cover externally, so that the sealing of the multifunctional hole is facilitated.
In one possible embodiment, the pressure relief mechanism is covered with a protective layer.
In the embodiment of the application, the pressure relief mechanism is provided with the protective layer, so that the pressure relief mechanism can be protected.
In a second aspect, there is provided an electrode assembly comprising an electrode assembly; a case having an opening to accommodate the electrode assembly; and an end cap assembly of any of the above embodiments covering the opening to cap the electrode assembly into the housing.
In a third aspect, a battery is provided comprising a battery cell according to any of the embodiments described above.
In a fourth aspect, a powered device is provided, including a battery in any of the above embodiments, the battery configured to provide electrical energy.
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 other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a vehicle according to an embodiment of the present application;
Fig. 2 is an exploded view of a battery according to an embodiment of the present application;
FIG. 3 is a schematic view of a battery cell according to an embodiment of the application;
FIG. 4 is a schematic illustration of the structure of an end cap assembly according to one embodiment of the present application;
FIG. 5 is a top view of FIG. 4;
Fig. 6 is a front view of fig. 4;
FIG. 7 is a bottom view of FIG. 4;
FIG. 8 is a bottom view of an end cap assembly according to another embodiment of the present application;
Reference numerals illustrate:
A vehicle 1, a battery 2, a battery cell 3;
Controller 11, motor 12, case 20, electrode assembly 31, case 32, electrode terminal 33, connection member 34, pressure release mechanism 35, end cap assembly 36, insulator 38;
A first case 201, a second case 202, an accommodation space 203, a case 321, a positive electrode terminal 331, a negative electrode terminal 332, an end cap 361, a multifunctional hole 362, a recess 381, and a main body 382;
Hollowed-out area 3811, non-hollowed-out area 3812, width direction X.
Detailed Description
Embodiments of the technical scheme 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 aspects of the present application, and thus are merely examples, and are not intended to limit the scope 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 of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.
In the description of embodiments of the present application, the technical terms "first," "second," and the like 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 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, and indicates that three relationships may exist, for example, a and/or B may indicate: 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" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means 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 description and simplification of the description, and do not indicate or imply 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 should 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 specific circumstances.
In the present application, the battery cell may include a lithium metal secondary battery, a sodium metal battery, a magnesium metal battery, or the like, and the embodiment of the present application is not limited thereto. The battery cell may be in a cylindrical, flat, or other shape, and the embodiment of the application is not limited thereto. 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 package battery cell are not limited in this embodiment. For convenience of explanation, the following examples will be described with reference to lithium metal batteries.
Reference to a battery in accordance with an embodiment 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 prior battery cell filling hole and the prior explosion-proof valve generally have the defects of low utilization rate of the shell and limitation of filling pressure. The explosion-proof valve and the liquid injection hole are the necessary structures of the battery monomer, so that the two functional parts are welded and sealed, the end cover structure of the battery is relatively complex, the manufacturing process difficulty is high, and the integration level is poor.
In addition, the structural points are more, which means that the risk points of functional failure are correspondingly increased. And, because of the battery production process requirement, the decompression mechanism need weld in advance and annotate liquid on the end cover. Therefore, when the liquid is injected, the pressure release mechanism limits the injection pressure, otherwise, once the pressure is overlarge, the pressure release mechanism is damaged in advance, and the battery is invalid.
In order to solve the problems, the embodiment of the application provides an end cover assembly for a battery cell, which integrates a liquid injection hole and a pressure release mechanism into one part, so that the end cover has a simple structure, the mechanical manufacturing difficulty of the end cover is reduced, and the liquid injection efficiency is improved; meanwhile, the end cover assembly provided by the embodiment of the application can avoid the problem of lithium precipitation of the electrode assembly caused by injection of electrolyte to the electrode assembly in the process of preparing the battery, thereby improving the cycle performance of the battery.
The end cover assembly described in the embodiment of the application is suitable for a battery cell, a battery and electric equipment using the battery.
The electric equipment can be vehicles, mobile phones, portable equipment, notebook computers, ships, spacecrafts, electric toys, electric tools and the like. The vehicle can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric device in particular.
For convenience of explanation, the following examples will be described taking an electric device as an example of a vehicle.
Fig. 1 is a schematic structural diagram of a vehicle 1 according to an embodiment of the present application. As shown in fig. 1, the interior of the vehicle 1 is provided with a battery 2, and the battery 2 may be provided at the bottom or at the head or at the tail of the vehicle 1. The battery 2 may be used for power supply of the vehicle 1, for example, the battery 2 may serve as an operating power source of the vehicle 1.
The vehicle 1 may further comprise a controller 11 and a motor 12, the controller 11 being adapted to control the battery 2 to supply the motor 12 with electric power, e.g. for operating power requirements during start-up, navigation and driving of the vehicle 1.
In some embodiments of the application, the battery 2 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.
Fig. 2 is an exploded view of a battery 2 according to an embodiment of the present application. As shown in fig. 2, the battery 2 includes a case 20, and the battery cells 3, the battery cells 3 being accommodated in the case 20.
The case 20 is for accommodating the battery cells 3. The housing 20 may be of various configurations. In some embodiments, the case 20 may include a first case portion 201 and a second case portion 202, the first case portion 201 and the second case portion 202 being overlapped with each other, the first case portion 201 and the second case portion 202 together defining an accommodating space 203 for accommodating the battery cell 3. The second case 202 may have a hollow structure with one end opened, the first case 201 has a plate-like structure, and the first case 201 is covered on the opening side of the second case 202 to form the case 20 having the accommodation space 203; the first case 201 and the second case 202 may each have a hollow structure with one side opened, and the opening side of the first case 201 is covered with the opening side of the second case 202 to form the case 20 having the accommodation space 203. Of course, the first and second case portions 201 and 202 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.
In order to improve the sealing property after the first case 201 and the second case 202 are connected, a sealing member, such as a sealant, a gasket, or the like, may be provided between the first case 201 and the second case 202.
Assuming that the first housing portion 201 is covered on top of the second housing portion 202, the first housing portion 201 may also be referred to as an upper case cover, and the second housing portion 202 may also be referred to as a lower case.
In the battery 2, the number of battery cells 3 is plural. The plurality of battery cells 3 can be connected in series or in parallel, and the series-parallel connection refers to that the plurality of battery cells 3 are connected in series or in parallel. The plurality of battery cells 3 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 3 is accommodated in the box body 20; of course, a plurality of battery cells 3 may be connected in series or parallel or series-parallel to form a battery module (not shown in the figure), and then connected in series or parallel or series-parallel to form a whole and accommodated in the case 20. The plurality of battery cells 3 in the battery module may be electrically connected through the bus bar member to realize parallel connection or series-parallel connection of the plurality of battery cells 3 in the battery module.
As shown in fig. 3, which is a schematic structural view of a battery cell 3 according to an embodiment of the present application, the battery cell 3 includes one or more electrode assemblies 31, a case 321, and an end cap 361. The housing 321 and the end cap 361 form the casing or battery compartment 32. The wall of the case 321 and the end cap 361 are referred to as the wall of the battery cell 3, wherein for a rectangular parallelepiped type battery cell 3, the wall of the case 321 includes a bottom wall and four side walls. The case 321 is dependent on the shape of the one or more electrode assemblies 31 combined, for example, the case 321 may be a hollow rectangular parallelepiped or square or cylindrical body, and one face of the case 321 has an opening so that the one or more electrode assemblies 31 may be placed in the case 321. For example, when the housing 321 is a hollow rectangular parallelepiped or square, one of the planes of the housing 321 is an opening surface, i.e., the plane has no wall body so that the inside and outside of the housing 321 communicate. When the housing 321 may be a hollow cylinder, an end surface of the housing 321 is an opening surface, that is, the end surface has no wall body so that the inside and the outside of the housing 321 are communicated. The end cap 361 covers the opening and is connected with the case 321 to form a closed cavity in which the electrode assembly 31 is placed. The housing 321 is filled with an electrolyte, such as an electrolyte solution.
The battery cell 3 may further include two electrode terminals 33, and the two electrode terminals 33 may be disposed on the end cap 361. The cap 361 is generally in the shape of a flat plate, and two electrode terminals 33 are fixed to the flat plate surface of the cap 361, and the two electrode terminals 33 are the positive electrode terminal 331 and the negative electrode terminal 332, respectively. One connection member 34, or may also be called a current collecting member 34, is provided for each electrode terminal 33, which is located between the end cap 316 and the electrode assembly 31, for electrically connecting the electrode assembly 31 and the electrode terminal 33.
In the battery cell 3, the electrode assemblies 31 may be provided in a single unit, or in a plurality of units, according to actual use requirements, as shown in fig. 3, 4 independent electrode assemblies 31 are provided in the battery cell 3.
Fig. 4 is a schematic structural view of an end cap assembly according to an embodiment of the present application, fig. 5 is a top view of fig. 4, fig. 6 is a front view of fig. 4, and fig. 7 is a bottom view of fig. 4. As shown in fig. 4 to 7, the end cap assembly 36 for the battery cell 3 includes an end cap 361, the end cap 361 being provided with a multi-functional hole 362, the multi-functional hole 362 being used for liquid injection and providing the pressure release mechanism 35; the insulating part 38, the insulating part 38 is disposed on the inner side of the end cover 361 facing the battery unit 3, the insulating part 38 includes a hollow area 3811 and a non-hollow area 3812, the non-hollow area 3812 is disposed opposite to the multifunctional hole 362, and the hollow area 3811 is located at the periphery of the non-hollow area 3812.
As described previously, the case 32 includes the case 321 and the end cap 361, and the case 32 houses the electrode assembly 31. The inside of the battery cell 3, that is, the side near the electrode assembly 31; the outside of the battery cell 3, i.e., the side remote from the electrode assembly 31.
In the embodiment of the present application, the pressure release mechanism 35 is a structural member that is actuated to release the internal pressure of the battery cell 3 when the internal pressure or temperature of the battery cell 3 reaches a threshold value. For example, the pressure release mechanism 35 may be a temperature-sensitive pressure release mechanism configured to be able to melt when the internal temperature of the battery cell 3 provided with the pressure release mechanism 35 reaches a threshold value; and/or the pressure release mechanism 35 may be a pressure sensitive pressure release mechanism configured to be able to rupture when the internal air pressure of the battery cell 3 provided with the pressure release mechanism 35 reaches a threshold value, the present application is not limited in any way as to the type of pressure release mechanism.
In embodiments of the present application, the end cap 361 may have various structures. For example, the end cap 361 may have a plate-like structure. Illustratively, in fig. 3, the housing 321 has a rectangular parallelepiped structure, the end cover 361 has a plate-like structure, and the end cover 361 may have other structures.
End cap 361 serves to isolate the electrolyte from the external environment. The end cap 361 may be made of an insulating material, such as plastic; but may also be made of an electrically conductive material such as copper, iron, aluminum, stainless steel or aluminum alloy.
The insulator 38 may serve to separate the end cap 361 and the electrode assembly 31, preventing the end cap 361 from contacting the electrode assembly 31, which may cause a risk of shorting the battery cell 3. In the embodiment of the present application, the insulating member 38 is made of an insulating material, and the insulating member 38 may be made of rubber or plastic.
The multifunctional hole 362 is arranged on the end cover 361, and the multifunctional hole 362 is used for injecting liquid and arranging the pressure release mechanism 35, namely, the liquid injection hole and the pressure release mechanism 35 are integrated, so that the structural complexity of the end cover 361 is reduced, and the manufacturing cost of the end cover 361 is reduced; the multi-functional holes 362 are used for filling liquid, and larger holes are also beneficial to increasing the filling liquid efficiency. In addition, an insulating part 38 is arranged on the inner side of the end cover 361 facing the battery cell3, the insulating part 38 comprises a non-hollowed-out area 3812 arranged opposite to the multifunctional hole 362 and a hollowed-out area 3811 positioned on the periphery of the non-hollowed-out area 3812, and the non-hollowed-out area 3812 is arranged opposite to the multifunctional hole 362, so that liquid can be prevented from directly impacting the electrode assembly 31 during liquid injection, and further the lithium precipitation problem of the electrode assembly 31 can be avoided; the hollowed-out region 3811 is disposed at the periphery of the non-hollowed-out region 3812 to ensure that the electrolyte can smoothly flow into the electrode assembly 31.
In the above-mentioned scheme, through setting up the insulating part 38 of the regional 3812 of non-fretwork that is relative with multi-functional hole 362, can avoid the lithium problem that separates that leads to because of the electrolyte is injected to electrode assembly 31 in battery 2 preparation process, improve the cycle performance of battery 2 and improve annotate liquid efficiency, and then improve the overall performance of battery when reducing battery machine manufacture degree of difficulty.
In some embodiments, as shown in fig. 6, the insulator 38 includes a recess 381 and a body portion 382, the body portion 382 being connected to the end cap 361, the recess 381 being disposed opposite the multifunctional aperture 362 with a space between a bottom wall of the recess 381 and the end cap 361.
In the embodiment of the present application, the insulating member 38 is required to ensure that the electrolyte can flow into the electrode assembly 31 to maintain the normal function of the battery cell 3, and to prevent the problem of lithium precipitation of the electrode assembly 31 caused by direct impact of the electrolyte on the electrode assembly 31 during the injection process.
Further, the insulating member 38 includes a concave portion 381 and a main portion 382, wherein the concave portion 381 includes a non-hollowed-out region 3812 and a hollowed-out region 3811. That is, the portion in the insulating member 38 forms the recess 381 to allow the electrolyte to flow into the electrode assembly 31 and to prevent the electrolyte from directly striking the electrode assembly 31.
In the above-described configuration, the insulator 38 is made to include two parts, namely, the recess 381 and the main body 382, wherein the recess 381 and the multifunction hole 362 are disposed opposite to each other, and a space is provided between the bottom wall of the recess 381 and the end cap 361 so as to be formed in the recess 381 opposite to the multifunction hole 362. Thus, recess 381 may be used to avoid the risk of electrolyte striking electrode assembly 31 during priming; the main body 382 may serve to connect the insulating member 38 with the end cap 361 and isolate the electrode assembly 31 from the end cap 361.
In some embodiments, non-hollowed-out region 3812 is located in the bottom wall in a region corresponding to the multifunctional aperture 362, and hollowed-out region 3811 is located in the bottom wall and/or the side wall of recess 381.
In the embodiment of the present application, the insulator 38 is composed of the concave portion 381 and the main body portion 382. Recess 381 is comprised of non-hollowed-out area 3812 and hollowed-out area 3811. When the electrolyte is injected through the multi-functional hole 362, the recess 381 disposed opposite to the multi-functional hole 362 should function to prevent the electrolyte from directly striking the electrode assembly 31, and thus the region of the recess 381 corresponding to the multi-functional hole 362 should be the non-hollowed-out region 3812. In order to allow the electrolyte to smoothly flow into the electrode assembly 31, the bottom or side wall of the recess 381 is a hollowed-out region 3811. In the embodiment of the present application, the bottom wall of the recess 381 may be the hollowed-out area 3811 except the non-hollowed-out area 3812, and the side wall of the recess 381 may be the hollowed-out area 3811, or may be one of the two, which is not limited in the present application.
In the above-described aspect, the hollowed-out region 3811 allows the electrolyte to smoothly flow into the electrode assembly 31 to maintain the normal function of the battery cell 3. The area of the bottom wall corresponding to the multifunctional hole 362 is set to be a non-hollowed-out area 3812, so that the problem of lithium precipitation of the electrode assembly 31 caused by direct impact of electrolyte on the electrode assembly 31 during liquid injection can be avoided, and the performance of the battery cell 3 is improved; the hollowed-out area 3811 is arranged on the bottom wall and/or the side wall of the concave part 381, so that the normal discharge of gas in the battery monomer 3 can be ensured, the normal function of the pressure release mechanism 35 is not affected, the device can be used as an electrolyte flow tunnel after liquid injection, and the electrolyte is uniformly distributed while the liquid injection rate is improved.
In some embodiments, as shown in fig. 7, in the width direction X of the end cap, the multifunctional hole 362 is located at the center of the end cap 361, and the hollowed-out areas 3811 on the bottom wall are located at two sides of the non-hollowed-out area 3812.
In the embodiment of the present application, the location of the multifunctional hole 362 in the center of the end cap 361 means that the distance between the multifunctional hole 362 and two sides of the end cap 361 in the width X direction is equal. However, the specific location of the multifunctional aperture 362 is not particularly critical to the present application and the above is merely illustrative.
Further, when the multifunctional hole 362 is located at the center of the end cap 361 in the width X direction, the recess 381 may extend in the width X direction. Similarly, the extending direction or position of the concave portion 381 is not particularly limited in the present application, and the position or shape of the concave portion 381 may be changed according to the shape or position of the multifunctional hole 362, as long as the area of the concave portion 381 opposite to the multifunctional hole 362 is the non-hollowed-out area 3812.
In addition, the hollowed-out region 3811 in the recess 381 functions to allow the electrolyte to flow into the electrode assembly 31. The hollowed-out areas 3811 on the bottom wall are located at two sides of the non-hollowed-out area 3812, that is, the non-hollowed-out area 3812 is taken as the center, and the two hollowed-out areas 3811 are symmetrically distributed, so that the electrolyte can flow into the electrode assembly 31 more uniformly.
In the above-described embodiment, when the recess 381 extends in the width direction X of the end cap 361, the multifunctional hole 362 is located at the center of the end cap 361 in the width direction X, that is, the projection of the non-hollowed-out area 3812 on the recess 381 onto the end cap 362 is also located at the center of the end cap 362 in the width direction X. In addition, the hollowed-out areas 3811 on the bottom wall of the recess 381 are located at two sides of the non-hollowed-out area 3812, so that the electrolyte is prevented from flowing to one side only, and uniform flow of the electrolyte is facilitated.
In some embodiments, the projection of the non-hollowed-out region 3812 onto the end cap 361 covers the multi-functional aperture 362.
The non-hollowed-out region 3812 is disposed on the recess 381 of the insulating member 38 to block the electrolyte from striking the electrode assembly 31 during the injection. To improve the protection effect of the non-hollowed-out area 3812, the area of the non-hollowed-out area 3812 may be increased. That is, the non-hollowed-out region 3812 covers the multifunctional hole 362 in the projection in the thickness direction of the end cap 361.
In the above-mentioned scheme, the multifunctional hole 362 is used for injecting liquid and setting the pressure release mechanism 35, and the non-hollowed-out area 3812 is used for avoiding the impact risk to the electrode assembly 31 during liquid injection. The projection of the non-hollowed-out area 3812 in the thickness direction of the end cover 361 covers the multifunctional hole 362, that is, the area of the non-hollowed-out area 3812 is larger than the area of the multifunctional hole 362, so that the protection effect of the non-hollowed-out area 3812 on the electrode assembly 31 can be improved.
In some embodiments, hollowed-out region 3811 includes through holes, and the total area of the through holes is greater than the area of multifunctional holes 362.
The hollowed-out region 3811 is used to allow the electrolyte to normally flow into the electrode assembly 31. The through holes are provided thereon, and further, the number of the through holes may be plural. Electrolyte is flowed through the through-holes, and the non-hollowed-out region 3812 between the through-holes can guide the electrolyte to flow near the through-holes. In addition, the present application is not limited in shape to the through-holes, and the through-holes may be regular oblong as illustrated in fig. 7 by way of example.
In the above scheme, the through hole in the hollowed-out area 3811 has the functions of enabling the battery monomer 3 to exhaust normally, not affecting the normal function of the pressure release mechanism 35, and improving the liquid injection rate as a flow tunnel of electrolyte after liquid injection. The total area of the through holes is larger than the area of the multifunctional holes 362, so that the effect of the hollowed-out area 3811 can be enhanced.
In some embodiments, please continue with reference to fig. 7, the length direction of the through-holes is parallel to the width direction X of the end cap 361.
In the above-mentioned scheme, through holes are formed in the hollowed-out area 3811, and further, the number of through holes may be plural, and the length direction of the plural through holes is parallel to the width direction X of the end cap 361, so that the electrolyte is uniformly distributed in the electrode assembly 31.
Fig. 8 is a bottom view of an end cap assembly according to another embodiment of the present application. As shown in fig. 8, in some embodiments, the length direction of the through-holes is perpendicular to the width direction X of the end cap 361.
In the above scheme, through holes are formed in the hollowed-out area 3811, further, the number of the through holes can be multiple, and the length direction of the through holes is perpendicular to the width direction X of the end cover 361, so that after liquid injection and drainage, the electrolyte is distributed more uniformly, and the liquid injection efficiency is further increased.
In some embodiments, the pressure relief mechanism 35 is welded to the end cap 361 in the area around the multifunctional aperture 362 facing the outside of the battery cell 3.
In the previous embodiment of the present application, the multi-functional hole 362 is used for both filling and setting the pressure release mechanism 35. That is, in the actual production process of the end cap 361, in order not to damage the normal use of the pressure release mechanism 35, the pressure release mechanism 35 should be arranged after the injection of the liquid is completed.
In the above-mentioned scheme, the pressure release mechanism 35 is welded with the area of the multifunctional hole 362 of the end cover 361 facing the outside of the battery cell 3, that is, the pressure release mechanism 35 is welded with the end cover 361 externally, which is more beneficial to sealing the multifunctional hole 362.
In some embodiments, the pressure relief mechanism 35 is covered with a protective layer.
In the embodiment of the present application, the protection layer may be a non-metal material, or may be a metal material or other materials, and the present application is not limited in material or shape of the protection layer, as long as the protection layer can protect the pressure release mechanism 35.
In the above scheme, a protective layer is disposed on the pressure release mechanism 35, so as to protect the pressure release mechanism 35.
The embodiment of the application also provides the battery monomer 3. The battery cell 3 includes an electrode assembly 31; a case 321 having an opening for accommodating the electrode assembly 31; and the end cap assembly 36 of the foregoing embodiments, the end cap assembly 36 covering the opening to cover the electrode assembly 31 in the case 321.
The embodiment of the application also provides a battery 2, which comprises the battery cell 3 in the previous embodiment.
The embodiment of the application also provides electric equipment, which comprises the battery 2 in the embodiment, wherein the battery 2 is used for providing electric energy.
While the 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 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 (13)

  1. An end cap assembly for a battery cell, comprising:
    The end cover is provided with a multifunctional hole which is used for injecting liquid and arranging a pressure release mechanism;
    The insulating piece, the insulating piece set up in the end cover is towards the free inboard of battery, the insulating piece includes fretwork area and non-fretwork area, non-fretwork area with multi-functional hole sets up relatively, fretwork area is located non-fretwork area's periphery.
  2. The end cap assembly of claim 1, wherein the insulator includes a recess and a flat portion, the flat portion being connected to the end cap, the recess and the multi-function hole being disposed opposite each other with a space between a bottom wall of the recess and the end cap.
  3. The end cap assembly of claim 2, wherein the non-hollowed-out area is located in an area of the bottom wall corresponding to the multi-functional aperture, the hollowed-out area being located in a sidewall of the bottom wall and or the recess.
  4. The end cap assembly of claim 3, wherein the multifunctional aperture is located in the center of the end cap in the width direction of the end cap, and the hollowed-out area in the bottom wall is located on both sides of the non-hollowed-out area.
  5. The end cap assembly of any one of claims 1 to 4, wherein a projection of the non-hollowed-out area onto the end cap covers the multi-functional aperture.
  6. The end cap assembly of any one of claims 1 to 5, wherein the hollowed-out area comprises through holes, the total area of the through holes being greater than the area of the multi-functional holes.
  7. The end cap assembly of claim 6, wherein the length direction of the through hole is parallel to the width direction of the end cap.
  8. The end cap assembly of claim 6, wherein the length direction of the through-hole is perpendicular to the width direction of the end cap.
  9. The end cap assembly of any one of claims 1 to 8, wherein the pressure relief mechanism is welded to an area of the end cap around the multifunctional aperture facing the outside of the cell.
  10. The end cap assembly of any one of claims 1 to 9, wherein the pressure relief mechanism is covered with a protective layer.
  11. A battery cell, comprising:
    An electrode assembly;
    a case having an opening for accommodating the electrode assembly; and
    The end cap assembly of any one of claims 1 to 10, covering the opening to cap the electrode assembly in the case.
  12. A battery, comprising
    The battery cell as recited in claim 11.
  13. A powered device, comprising:
    The battery of claim 12, for providing electrical energy.
CN202280068051.0A 2022-07-22 2022-07-22 End cover assembly for battery cell, battery and electric equipment Pending CN118044059A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2022/107305 WO2024016308A1 (en) 2022-07-22 2022-07-22 End cover assembly for battery cell, battery cell, battery and electric device

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Publication Number Publication Date
CN118044059A true CN118044059A (en) 2024-05-14

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WO (1) WO2024016308A1 (en)

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CN117890377B (en) * 2024-02-22 2024-06-25 宁德时代新能源科技股份有限公司 Battery monomer flexible connecting piece detection system and point detection method

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JP2014075279A (en) * 2012-10-04 2014-04-24 Toyota Industries Corp Power storage device
CN207938663U (en) * 2018-01-31 2018-10-02 比亚迪股份有限公司 Cover plate assembly, battery, battery pack and vehicle
CN207800664U (en) * 2018-02-01 2018-08-31 宁德时代新能源科技股份有限公司 Cap assembly and power battery
CN208478390U (en) * 2018-07-26 2019-02-05 宁德时代新能源科技股份有限公司 Cap assembly and secondary cell
CN214153028U (en) * 2020-12-31 2021-09-07 蜂巢能源科技有限公司 Top cap subassembly, electricity core, battery and vehicle
CN214505620U (en) * 2021-03-17 2021-10-26 合肥国轩高科动力能源有限公司 Square battery stop frame
CN215418522U (en) * 2021-07-29 2022-01-04 蜂巢能源科技有限公司 Top cover assembly and lithium battery

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