CN217281132U - Battery cell, battery and power consumption device - Google Patents

Battery cell, battery and power consumption device Download PDF

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Publication number
CN217281132U
CN217281132U CN202221692023.XU CN202221692023U CN217281132U CN 217281132 U CN217281132 U CN 217281132U CN 202221692023 U CN202221692023 U CN 202221692023U CN 217281132 U CN217281132 U CN 217281132U
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Prior art keywords
end wall
battery
electrode
battery cell
connecting portion
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Inventor
孙东升
姜玲燕
迟庆魁
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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Priority to CN202221692023.XU priority Critical patent/CN217281132U/en
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Priority to PCT/CN2023/105628 priority patent/WO2024008054A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
    • H01M50/143—Fireproof; Explosion-proof
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
    • H01M50/145—Primary casings; Jackets or wrappings for protecting against damage caused by external factors for protecting against corrosion
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The application provides a battery monomer, battery and power consumption device, battery monomer includes: the shell comprises an end wall and a side wall, and the end wall and the side wall enclose to form an accommodating space; an electrode assembly located in the receiving space, the electrode assembly including an electrode main body and a first tab protruding from the electrode main body toward the end wall; and the electrode current collector is positioned between the first lug and the end wall and used for connecting the lug and the end wall, and comprises a through hole which is arranged in a penetrating way. In the technical scheme of this application embodiment, the through-hole has been seted up on the electrode mass flow body, when the battery monomer produced high temperature and takes place the thermal runaway in the use, the active material in steam or the casing can be through the through-hole spout in by the casing fast, can reduce the free temperature of battery comparatively express delivery ground, improves because of dangerous problems such as the explosion that the thermal runaway leads to, and then improves the free security performance of battery.

Description

Battery cell, battery and power consumption device
Technical Field
The application relates to the field of batteries, in particular to a single battery, a battery and an electric device.
Background
Energy conservation and emission reduction are the key points of sustainable development of the automobile industry, and electric vehicles become important components of the sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in its development.
In the conventional battery cell, the battery cell includes a case and an electrode assembly disposed in the case. High temperature may be generated in the use process of an electrode assembly in a battery cell, so that the risk of thermal runaway of the battery is caused, and the safety performance of the battery cell is seriously affected.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, the present application provides a battery cell, a battery, and an electric device, which can improve the safety performance of the battery cell.
In a first aspect, the present application provides a battery cell, comprising: the shell comprises an end wall and a side wall, and the end wall and the side wall enclose to form an accommodating space; an electrode assembly located in the receiving space, the electrode assembly including an electrode main body and a first tab protruding from the electrode main body toward the end wall; and the electrode current collector is positioned between the first lug and the end wall and used for connecting the lug and the end wall, and comprises a through hole which is arranged in a penetrating way.
In the technical scheme of this application embodiment, battery monomer includes casing, electrode subassembly and the electrode current collector, and electrode subassembly and electrode current collector are located the casing for the casing can provide the protection to electrode subassembly and electrode current collector. The electrode assembly includes an electrode body and a first tab with an electrode current collector connected between the first tab and an end wall of the case such that the case can be charged without corrosion. The through-hole has been seted up on the electrode mass flow body, when battery monomer produced high temperature and takes place thermal runaway in the use, the active material in steam or the casing can be through the through-hole by the internal blowout of casing fast, can reduce the free temperature of battery comparatively fast, improves because of dangerous problems such as the explosion that thermal runaway leads to, and then improves the free security performance of battery.
In some embodiments, the electrode current collector includes a body portion and a connection portion that is formed to protrude toward the end wall with respect to the body portion, and the electrode current collector is connected to the end wall by the connection portion.
In the embodiments, by providing the connecting part protruding out of the body part on the electrode current collector, assembly tolerance between the electrode assembly and the casing can be compensated, so that the connecting part can be stably abutted against the end wall, and the stability of connection between the electrode current collector and the end wall is ensured.
In some embodiments, the end wall is provided with a pressure relief mechanism, the connection being connected to the pressure relief mechanism.
In these embodiments, the connection part is connected to the pressure relief mechanism, so that the distance between the electrode current collector and the pressure relief mechanism can be reduced, and further the distance between the through hole and the pressure relief mechanism can be reduced. Therefore, when the battery monomer is out of thermal runaway, hot air or active substances can flow to the pressure relief mechanism through the through hole relatively quickly and flow out of the shell, and the thermal runaway problem of the battery monomer is better improved. And connecting portion connect in pressure release mechanism for connecting portion can exert the effort to pressure release mechanism, improves pressure release mechanism's deformation problem, and then improves when battery monomer thermal runaway, improves the problem that the steam or the active material flow velocity is slow because of pressure release mechanism warp and leads to.
In some embodiments, the edge of the pressure relief mechanism surrounds the periphery of the connecting portion and is spaced apart from the connecting portion. Therefore, the size of the pressure relief mechanism is larger than that of the connecting part, and the influence of the connecting part on the function of the pressure relief mechanism is improved.
In some embodiments, at least one through hole is adjacent to the connection portion. The distance between through-hole and the connecting portion can be reduced, and then the distance between through-hole and the pressure relief mechanism is reduced. When the battery monomer takes place thermal runaway, hot gas or active substance can flow to pressure relief mechanism through the through-hole comparatively fast and flow out of the casing, improve the free thermal runaway problem of battery better.
In some embodiments, the plurality of through holes are adjacent to the connection portion and are disposed at intervals on the circumferential side of the connection portion. The area of the opening hole in the electrode current collector can be increased, the distance between the through holes and the connecting portion can be reduced, and the distance between the through holes and the pressure relief mechanism is reduced. When the battery monomer takes place thermal runaway, hot gas or active material can flow to the pressure relief mechanism through the through-hole more fast and flow out of the casing, improve the free thermal runaway problem of battery better.
In some embodiments, a fan is formed between two adjacent through holes, and the fan is protruded from the connecting portion in a direction away from the end wall at the proximal end.
In these alternative embodiments, by the fan projecting toward the end wall so that the connecting portion can project toward the end wall, the distance between the connecting portion and the end wall is reduced, assembly tolerances can be compensated for, and the connection strength between the belt connecting portion and the end wall can be ensured.
In some embodiments, the extension of the fan blades along the circumferential direction of the connecting part is gradually increased along the direction away from the connecting part. The size of the fan blade can be increased, and the fan blade is guaranteed to have enough structural strength.
In some embodiments, the connecting portion is circular, and the flow area S1 of the fan blade and the connecting portion satisfies the following relation:
Figure 746345DEST_PATH_IMAGE001
wherein d is the diameter of the connecting part, a is the thickness of the connecting part, n is the number of the fan blades, theta is the radian of an arc line where the connecting part and the fan blades are connected, and S1 is 3mm 2 ~20mm 2 。
In these embodiments, when S1 satisfies the above relationship, it is possible to improve the influence of the excessively small flow area S1 on the overcurrent between the connecting portion and the fan blade, and the influence on the overcurrent between the first tab and the end wall; the problem that the through hole area is influenced due to the fact that the flowing area S1 is too large, and the speed of hot air or active substances sprayed out of the shell is influenced can be solved.
In some embodiments, the through hole has an increasing extension in a circumferential direction of the connection portion in a direction away from the connection portion. The open area of the through holes can be increased, and the speed of hot air or active substances passing through the through holes is improved.
In some embodiments, the connecting portion is circular, and the diameter of the connecting portion is 3mm to 10 mm. Not only can improve the influence on the connection strength between the electrode current collector and the end wall due to the undersize of the connecting part, but also can improve the influence on the size of the through hole due to the oversize of the connecting part and the influence on the speed of hot gas or active substances passing through the through hole.
In some embodiments, the total area S2 of the through holes is 20mm 2 ~300mm 2 . The speed of hot air or active substances passing through the through holes can be improved due to the influence of too small through holes; the influence on the structural strength of the electrode current collector due to the overlarge through holes and the influence on the connection strength between the electrode current collector and the end wall can also be improved.
In some embodiments, the case further includes an opening disposed opposite the end wall and an end cap covering the opening, the end cap being provided with an electrode terminal, the electrode assembly further including a second tab extending from the electrode main body toward the end cap, the second tab and the electrode terminal being interconnected.
In these embodiments, the electrode assembly may be placed into the case from an opening of the case. The second tab is connected to the electrode terminal on the end cap such that the second tab is insulated from the housing, and the first tab is connected to the end wall of the housing to improve the short circuit connection of the first tab and the second tab.
In a second aspect, an embodiment of the present application further provides a battery, including any one of the battery cells according to the embodiments of the first aspect.
In a third aspect, an embodiment of the present application further provides an electric device, including any one of the battery cells in the embodiments of the first aspect, where the battery cell is used to provide electric energy.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of a battery provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a battery module according to an embodiment of the present disclosure;
fig. 4 is an exploded schematic view of a battery cell according to an embodiment of the present disclosure;
fig. 5 is a front view of a battery cell according to an embodiment of the present disclosure;
FIG. 6 is a cross-sectional view taken at A-A of FIG. 5;
FIG. 7 is a schematic view of a portion of the enlarged structure at I in FIG. 6;
fig. 8 is a front view of an electrode current collector of a battery cell according to an embodiment of the present disclosure;
fig. 9 is a sectional view at B-B in fig. 8.
The reference numbers in the detailed description are as follows:
1 vehicle, 10 battery, 11 controller, 12 motor;
20 a battery module;
30 cases, 301 first case portions; 302 a second tank portion;
100 single cells, 110 shells, 111 end walls, 112 side walls, 120 electrode assemblies, 121 electrode bodies, 122 first tabs, 123 second tabs, 130 electrode current collectors, 131 through holes, 132 body parts, 133 connecting parts, 134 fan sheets, 140 pressure relief mechanisms, 150 end covers, 151 electrode terminals, 160 adapter parts, 170 insulating parts and 180 liquid injection caps.
X, a first direction; y, a second direction; z; and a third direction.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.
It is to be noted that technical terms or scientific terms used in the embodiments of the present application should be taken as a general meaning understood by those skilled in the art to which the embodiments of the present application belong, unless otherwise specified.
In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations and positional relationships that are based on the orientations and positional relationships shown in the drawings, and are used only for convenience in describing the embodiments of the present application and for simplicity in description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the embodiments of the present application.
Furthermore, the technical terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.
In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; mechanical connection or electrical connection is also possible; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
At present, the application of the power battery is more and more extensive from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanded.
In this application, the battery cell may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, and the embodiment of the present application is not limited thereto. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application.
Reference to a battery in embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc. Batteries generally include a case for enclosing one or more battery cells. The box can avoid liquid or other foreign matters to influence the charge or discharge of battery cells.
The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive electrode piece, a negative electrode piece and a separator. The battery cell mainly depends on metal ions to move between the positive pole piece and the negative pole piece to work. The positive pole piece comprises a positive current collector and a positive active substance layer, and the positive active substance layer is coated on the surface of the positive current collector; the positive current collector comprises a positive current collecting part and a positive electrode lug connected to the positive current collecting part, wherein the positive current collecting part is coated with a positive active substance layer, and the positive electrode lug is not coated with the positive active substance layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The negative pole piece comprises a negative pole current collector and a negative pole active substance layer, and the negative pole active substance layer is coated on the surface of the negative pole current collector; the negative current collector comprises a negative current collecting part and a negative electrode lug connected to the negative current collecting part, wherein the negative current collecting part is coated with a negative active material layer, and the negative electrode lug is not coated with the negative active material layer. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon, silicon, or the like. The material of the spacer may be PP (polypropylene) or PE (polyethylene).
The present inventors have noticed that when thermal runaway of a battery cell occurs during use, it is difficult for hot gas or active material to be ejected from the case of the battery cell in time, which may cause a risk of explosion or the like.
In order to alleviate the above problems, the applicant researches and discovers that through holes can be formed in an electrode current collector of a single battery, so that hot gas or active substances can be timely transmitted from the through holes, the temperature of the single battery can be reduced, dangerous situations such as explosion caused by thermal runaway can be alleviated, and the safety performance of the single battery can be improved.
Based on the above consideration, the inventors have conducted intensive studies to design a battery cell, a battery, and an electric device in order to alleviate the problems of explosion and the like due to thermal runaway.
In such battery monomer, battery monomer includes the casing, is located electrode subassembly and the electrode current collector of casing, is provided with the through-hole on the electrode current collector for hot gas or active material can in time follow the through-hole transmission, and then can reduce battery monomer temperature, can alleviate dangerous situations such as the explosion because thermal runaway causes, improve battery monomer's security performance.
The technical scheme described in the embodiment of the application is suitable for the battery and the electric device using the battery.
The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The vehicle can be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle and the like; spacecraft include aircraft, rockets, space shuttles, and spacecraft, among others; electric toys include stationary or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric airplane toys, and the like; the electric power tools include metal cutting electric power tools, grinding electric power tools, assembly electric power tools, and electric power tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers. The embodiment of the present application does not specifically limit the above power utilization device.
It should be understood that the technical solutions described in the embodiments of the present application are not limited to be applied to the above-described battery and electric equipment, but may be applied to all batteries including a box and electric equipment using the battery.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1 according to some embodiments of the present disclosure. The vehicle 1 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile and the like. The interior of the vehicle 1 is provided with a battery 10, and the battery 10 may be provided at the bottom or at the head or tail of the vehicle 1. The battery 10 may be used for power supply of the vehicle 1, and for example, the battery 10 may serve as an operation power source of the vehicle 1. The vehicle 1 may further include a controller 11 and a motor 12, the controller 11 being configured to control the battery 10 to power the motor 12, for example, for start-up, navigation, and operational power requirements of the vehicle 1 during travel.
In some embodiments of the present application, the battery 10 may be used not only as an operating power source of the vehicle 1, but also as a driving power source of the vehicle 1, instead of or in part of fuel or natural gas, to provide driving power for the vehicle 1.
In order to meet different power requirements, the battery 10 may include a plurality of battery cells, which are the smallest units constituting a battery module or a battery pack. A plurality of battery cells may be connected in series and/or in parallel via electrode terminals to be applied to various applications. The battery referred to in this application includes a battery module or a battery pack. The plurality of battery cells can be connected in series or in parallel or in series-parallel, and the series-parallel refers to the mixture of series connection and parallel connection. In the embodiment of the application, a plurality of battery cells may directly form a battery pack, or may first form the battery module 20, and then the battery module 20 forms the battery pack.
Fig. 2 shows a schematic structural diagram of the battery 10 according to an embodiment of the present application.
As shown in fig. 2, the battery includes a case 30 and a battery cell 100, and the battery cell 100 is accommodated in the case.
The box body 30 may be a single cuboid, a cylinder, a sphere, or other simple three-dimensional structure, or may be a complex three-dimensional structure formed by combining cuboid, cylinder, or sphere, which is not limited in the embodiment of the present application. The material of the box 30 may be an alloy material such as an aluminum alloy and an iron alloy, a polymer material such as polycarbonate and polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin, which is not limited in the embodiment of the present application.
The case is used to accommodate the battery cells, and the case 30 may have various structures. In some embodiments, the case may include a first case portion 301 and a second case portion 302, the first case portion 301 and the second case portion 302 cover each other, and the first case portion 301 and the second case portion 302 together define a receiving space for receiving the battery cell. The second casing portion 302 may be a hollow structure with one open end, the first casing portion 301 is a plate-shaped structure, and the first casing portion 301 covers the open end of the second casing portion 302 to form a casing with an accommodating space. The first casing portion 301 and the second casing portion 302 may be hollow structures with one side open, and the open side of the first casing portion 301 covers the open side of the second casing portion 302 to form the casing 30 having the accommodating space. Of course, the first tank portion 301 and the second tank portion 302 may be various shapes, such as a cylinder, a rectangular parallelepiped, and the like.
In order to improve the sealing property after the first tank portion 301 and the second tank portion 302 are connected, a sealing member, such as a sealant or a gasket, may be provided between the first tank portion 301 and the second tank portion 302.
Assuming that the first box portion 301 covers the top of the second box portion 302, the first box portion 301 may also be referred to as an upper box cover, and the second box portion 302 may also be referred to as a lower box body.
In the battery, there may be one or more battery cells. If the number of the battery monomers is multiple, the multiple battery monomers can be connected in series or in parallel or in series-parallel, and the series-parallel refers to that the multiple battery monomers are connected in series or in parallel. The plurality of battery monomers can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery monomers is accommodated in the box body 30; of course, a plurality of battery cells may be connected in series, in parallel, or in series-parallel to form the battery module 20, and a plurality of battery modules 20 may be connected in series, in parallel, or in series-parallel to form a whole and be accommodated in the box 30.
Fig. 3 shows a schematic structural diagram of the battery module 20 according to an embodiment of the present application.
In some embodiments, as shown in fig. 3, there are a plurality of battery cells 100, and the plurality of battery cells 100 are connected in series or in parallel or in series-parallel to form the battery module 20. The plurality of battery modules 20 are connected in series or in parallel or in series-parallel to form a whole, and are accommodated in the case.
The plurality of battery cells 100 in the battery module 20 may be electrically connected to each other by a bus member, so as to connect the plurality of battery cells in the battery module 20 in parallel, in series, or in series-parallel.
In this application, the battery cell 100 may include a lithium ion battery cell, a sodium ion battery cell, a magnesium ion battery cell, or the like, which is not limited in this application. The battery cell 100 may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, which is not limited in the embodiments of the present application. The battery cells 100 are generally divided into three types in an encapsulated manner: the single battery of cylindricality battery, square battery monomer and laminate polymer battery monomer, this application embodiment is to this also not limited. However, for the sake of brevity, the following embodiments are described with reference to cylindrical battery cells as an example.
Fig. 4 is an exploded schematic view of a battery cell 100 according to some embodiments of the present disclosure. Fig. 5 is a front view of a battery cell 100 according to some embodiments of the present disclosure, fig. 6 is a cross-sectional view taken along line a-a in fig. 5, and fig. 7 is a partially enlarged structural view taken along line I in fig. 6. The battery cell 100 refers to the smallest unit constituting the battery.
As shown in fig. 4 to 7, the battery cell 100 includes a case 110, and an electrode assembly 120 and an electrode collector 130 located within the case 110. The housing 110 includes an end wall 111 and a side wall 112, and the end wall 111 and the side wall 112 enclose to form an accommodating space; the electrode assembly 120 is located in the receiving space, the electrode assembly 120 including an electrode body 121 and a first tab 122 protruding from the electrode body 121 toward the end wall 111; an electrode collector 130 is located between the first tab 122 and the end wall 111 and serves to connect the tab and the end wall 111, and the electrode collector 130 includes a through-hole 131 disposed therethrough.
The case 110 is an assembly for forming an internal environment of the battery cell 100, wherein the formed internal environment may be used to house the electrode assembly 120, an electrolyte (not shown in the drawings), and other components. The battery cell 100 may further include an end cap 150 covering the opening of the housing 110, the housing 110 and the end cap 150 may be separate components, and an opening may be formed in the housing 110, and the opening is covered by the end cap 150 to form an internal environment of the battery cell 100. Without limitation, the end cap 150 and the housing 110 may be integrated, and specifically, the end cap 150 and the housing 110 may form a common connecting surface before other components are inserted into the housing, and when it is required to encapsulate the interior of the housing 110, the end cap 150 covers the housing 110. The housing 110 may be various shapes and various sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism shape, and the like. Specifically, the shape of the case 110 may be determined according to the specific shape and size of the electrode assembly 120. The material of the housing 110 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment.
The electrode assembly 120 is a component in which electrochemical reactions occur in the battery cell 100. The electrode assembly 120 includes an electrode body 121 and tabs extending from the electrode body 121, and the electrode body 121 is formed by winding a positive electrode current collector, an insulating separator, and a negative electrode current collector. The electrode assembly 120 includes pole pieces including a positive pole piece and a negative pole piece, wherein a portion of the positive pole piece having an active material forms a positive current collector, and a portion of the positive pole piece not having an active material forms a positive tab. The part of the negative electrode sheet with the active material forms a negative electrode current collector, and the part of the negative electrode sheet without the active material forms a negative electrode tab. The positive and negative electrode tabs may be located together at one end of the electrode main body 121 or at both ends of the electrode main body 121, respectively.
The first tab 122 may be a positive tab or a negative tab, and the embodiment of the present application takes the first tab 122 as a negative tab for example.
The electrode collector 130 is a member for connecting the first tab 122 and the end wall 111, and the electrode collector 130 can increase a connection area with the end wall 111 and ensure stability of relative positions among the first tab 122, the electrode collector 130, and the end wall 111. The through-holes 131 may be disposed at any suitable positions on the electrode collector 130. The shape of the through hole 131 may be regular, such as circular, elliptical, polygonal, etc., and the shape of the through hole 131 may be irregular.
In the technical solution of the embodiment of the present application, the battery cell 100 includes a case 110, an electrode assembly 120, and an electrode current collector 130, and the electrode assembly 120 and the electrode current collector 130 are located in the case 110, so that the case 110 can provide protection for the electrode assembly 120 and the electrode current collector 130. The electrode assembly 120 includes an electrode body 121 and a first tab 122, and an electrode collector 130 is connected between the first tab 122 and the end wall 111 of the case 110, so that the case 110 can be charged without corrosion. For example, when the first tab 122 is a negative tab, the case 110 can be negatively charged, so that the case 110 is not easily corroded. The electrode current collector 130 is provided with the through hole 131, when the battery cell 100 generates high temperature in the using process and thermal runaway occurs, hot gas or active substances in the casing 110 can be rapidly ejected out of the casing 110 through the through hole 131, the temperature of the battery cell 100 can be rapidly reduced, the dangerous problems such as explosion caused by thermal runaway can be solved, and the safety performance of the battery cell 100 can be improved.
In some embodiments of the present application, the electrode collector 130 includes a body portion 132 and a connection portion 133, the connection portion 133 is formed to protrude toward the end wall 111 with respect to the body portion 132, and the electrode collector 130 is connected to the end wall 111 by the connection portion 133.
The body part 132 refers to a portion of the electrode collector 130 near the first tab 122, and the first tab 122 may be coupled to the body part 132. The connection part 133 refers to a portion of the electrode collector 130 that protrudes toward the end wall 111 relative to the body part 132, and at least a portion of the connection part 133 may be connected to the end wall 111. The body portion 132 may be disposed on either side of the connecting portion 133 in the circumferential direction, or the body portion 132 may be disposed around the connecting portion 133 to improve the stability of the interconnection of the connecting portion 133 and the body portion 132.
In these embodiments, by providing the connecting portion 133 protruding from the body portion 132 on the electrode current collector 130, assembly tolerance between the electrode assembly 120 and the case 110 can be compensated, and by changing the height of the connecting portion 133 protruding from the body portion 132, the electrode current collector 130 can be connected to the end wall 111 at various positions, so that the connecting portion 133 can be relatively stably abutted against the end wall 111, and stability of connection between the electrode current collector 130 and the end wall 111 can be ensured.
In some embodiments of the present application, the end wall 111 is provided with a pressure relief mechanism 140, and the connecting portion 133 is connected to the pressure relief mechanism 140.
The pressure relief mechanism 140 is configured to relieve pressure when the pressure or temperature within the housing 110 reaches a threshold value. While the pressure relief mechanism 140 may be provided in a variety of ways, when the pressure relief mechanism 140 is integrally formed on the end wall 111, for example, the pressure relief mechanism 140 may be an indentation provided on the end wall 111, the indentation having a structural strength less than that of other locations. Alternatively, the end wall 111 is provided with a mounting hole, and the pressure relief mechanism 140 is mounted in the mounting hole in the end wall 111.
In these embodiments, the connection part 133 is connected to the pressure relief mechanism 140, which can reduce the distance between the electrode collector 130 and the pressure relief mechanism 140, and thus reduce the distance between the through-hole 131 and the pressure relief mechanism 140. Therefore, when thermal runaway of the battery cell 100 occurs, hot air or active substances can flow to the pressure relief mechanism 140 through the through hole 131 and flow out of the housing 110 relatively quickly, and the thermal runaway problem of the battery cell 100 is improved better. And the connection part 133 is connected to the pressure relief mechanism 140, so that the connection part 133 can apply an acting force to the pressure relief mechanism 140, thereby improving the deformation problem of the pressure relief mechanism 140, and further improving the problem of low flow speed of hot air or active substances caused by the deformation of the pressure relief mechanism 140 when the battery cell 100 is thermally out of control.
In some embodiments, the edge of the pressure relief mechanism 140 surrounds the connecting portion 133 and is spaced apart from the connecting portion 133.
The connecting portion 133 is connected to the inside of the pressure relief mechanism 140, and the connecting portion 133 and the pressure relief mechanism 140 are disposed in various relative positions, for example, the connecting portion 133 is disposed near the center of the pressure relief mechanism 140, so that the stress on the pressure relief mechanism 140 is more balanced. In other embodiments, the connecting portion 133 may be connected to other positions of the pressure relief mechanism 140 as long as the connecting portion 133 and the edge of the pressure relief mechanism 140 are spaced apart.
In these alternative embodiments, the pressure relief mechanism 140 generally achieves the purpose of releasing the heat or active material by breaking the edges thereof to create cracks, and when the connecting portion 133 and the edges of the pressure relief mechanism 140 are spaced apart, the influence of the connecting portion 133 on the function of the pressure relief mechanism 140 can be improved. And the size of the pressure relief mechanism 140 is large, when a crack is generated between the pressure relief mechanism 140 and the end wall 111 body, the size of the crack can be increased, so that hot gas or active substances can be rapidly discharged from the pressure relief mechanism 140.
In some embodiments of the present application, at least one through hole 131 is adjacent to the connection portion 133.
The through-hole 131 being adjacent to the connection portion 133 means that the edge of the connection portion 133 borders the through-hole 131, and the edge of the connection portion 133 and the through-hole 131 communicate with each other.
In these alternative embodiments, the proximity of at least one through-hole 131 to the connection 133 can reduce the distance between the through-hole 131 and the connection 133, and thus the distance between the through-hole 131 and the pressure relief mechanism 140. When thermal runaway occurs in the battery cell 100, hot air or active substances can flow to the pressure relief mechanism 140 through the through hole 131 relatively quickly and flow out of the casing 110, so that the thermal runaway problem of the battery cell 100 is better improved.
In some embodiments of the present application, as shown in fig. 8 and 9, the plurality of through holes 131 are adjacent to the connection portion 133 and are disposed at intervals on the circumferential side of the connection portion 133.
The plurality of through holes 131 are spaced apart on the circumferential side of the connecting portion 133, and the edge of the connecting portion 133 defines the plurality of through holes 131.
In these alternative embodiments, providing the plurality of through holes 131 can increase the area of the opening on the electrode collector 130, and can reduce the distance between the plurality of through holes 131 and the connecting portion 133, and reduce the distance between the plurality of through holes 131 and the pressure relief mechanism 140. When thermal runaway of the battery cell 100 occurs, hot air or active substances can flow to the pressure relief mechanism 140 through the through hole 131 and flow out of the housing 110 more quickly, so that the thermal runaway problem of the battery cell 100 is better improved.
In addition, the plurality of through holes 131 surround the connecting portion 133, so that when hot air or active substances can enter the pressure relief mechanism 140 from different positions on the circumferential direction of the connecting portion 133 and be discharged outside the housing 110, the discharging speed of the hot air or the active substances can be further accelerated.
In some embodiments of the present application, as shown in fig. 4 to 9, a fan 134 is formed between two adjacent through holes 131, and the fan 134 is protruded from the connecting portion 133 in a direction away from the end wall 111. For example, the fan 134 is convexly arranged in the third direction Z near the end wall 111.
When there are a plurality of through holes 131, there are a plurality of fan blades 134. In the embodiment of the present application, the number of the through holes 131 and the number of the fan blades 134 are 3 for illustration. In other embodiments, the number of through holes 131 and the number of fan blades 134 may be 2, 4, 5 or more.
The fan 134 is a portion of the electrode collector 130 located between two adjacent through holes 131, that is, the adjacent through holes 131 are spaced apart from each other by the fan 134. The fan 134 is connected between the body portion 132 and the connecting portion 133, and the fan 134, the connecting portion 133 and the body portion 132 may be integrally formed to improve the connection strength between the fan 134 and the body portion 132 and the connecting portion 133.
In these alternative embodiments, by the fan 134 projecting toward the end wall 111 so that the connecting portion 133 can project toward the end wall 111, the distance between the connecting portion 133 and the end wall 111 is reduced, it is possible to compensate for assembly tolerances, and to secure the connection strength between the belt connecting portion 133 and the end wall 111.
In some embodiments of the present application, as shown in fig. 4 to 9, the extension of the fan blade 134 along the circumferential direction of the connecting portion 133 is gradually increased in a direction away from the connecting portion 133. For example, in the first direction X or the second direction Y, in a direction away from the connecting portion 133, the extension of the fan piece 134 in the circumferential direction of the connecting portion 133 gradually increases.
In these embodiments, the size of the fan 134 is large, which ensures that the fan 134 has sufficient structural strength and ensures the connection strength between the fan 134 and the body portion 132 and the connection portion 133.
In some embodiments of the present application, the connecting portion 133 is circular, and the flow area S1 of the fan 134 and the connecting portion 133 satisfies the following relation:
Figure 463765DEST_PATH_IMAGE001
wherein d is the diameter of the connecting portion 133, a is the thickness of the connecting portion 133, n is the number of the fan blades 134, θ is the radian of the arc line of the connecting position of the connecting portion 133 and the fan blades 134, and S1 is3mm 2 ~20mm 2 。
The flow area S1 is equal to the length of the arc line where the connecting part 133 and the fan blade 134 are located multiplied by the thickness a of the connecting part 133, and the length of the arc line where the connecting part 133 and the fan blade 134 are located is
Figure 796658DEST_PATH_IMAGE002
. The flow area S1 satisfies the above-described relational expression.
In these embodiments, when S1 satisfies the above relationship, it is possible to improve that the excessive flow between the connecting portion 133 and the fan 134 is affected due to the excessively small flow area S1, and the excessive flow of the current between the first tab 122 and the end wall 111 is affected; the influence on the area of the through hole 131 and the speed of the hot air or the active material sprayed out of the housing 110 due to the excessive flow area S1 can be improved.
In some embodiments of the present application, as shown in fig. 7 to 9, an extension of the through hole 131 in a circumferential direction of the connecting portion 133 is gradually increased in a direction away from the connecting portion 133. The circumferential direction of the connection portion 133 refers to a direction surrounding the connection portion 133.
In these alternative embodiments, the through hole 131 is smaller near the connecting portion 133, so that the fan blade 134 and the connecting portion 133 can have sufficient connecting strength. The portion of the through hole 131 far from the connection portion 133 has a large size, so that the opening area of the through hole 131 can be increased, and the speed of hot air or active material passing through the through hole 131 can be increased.
Alternatively, the through hole 131 is a sector-shaped part, and the through hole 131 has a first annular edge facing the connecting portion 133 and a second annular edge facing away from the connecting portion 133, and the first annular edge and the second annular edge may be disposed at equal intervals. The through hole 131 may further include two side edges of the first annular edge and the second annular edge, and the side edges may be formed to extend along a straight path. Optionally, an intersection point of the extension lines of the two side edges is a circle center of a circle where the first annular edge or the second annular edge is located.
In some embodiments of the present disclosure, the connecting portion 133 is circular, and the diameter of the connecting portion 133 is 3mm to 10 mm.
The connection portion 133 having a circular shape means that an orthogonal projection of the connection portion 133 along the third direction Z has a circular shape, and a diameter of the connection portion 133 is an orthogonal projection of the connection portion 133 along the third direction Z.
In these alternative embodiments, when the diameter of the connection part 133 is within the above range, it is possible to improve both the connection strength between the electrode current collector 130 and the end wall 111, which is affected by the undersize of the connection part 133, and the speed at which hot gas or active material passes through the through-hole 131, which is affected by the oversize of the connection part 133.
In some embodiments of the present application, the total area S2 of the through-holes 131 is 20mm 2 ~300mm 2 。
When there is only one through-hole 131, the total area S2 of the through-holes 131 is the area of one through-hole 131. When the number of the through holes 131 is plural, the total area S2 of the through holes 131 is the sum of the areas of the plural through holes 131. The area of the through-hole 131 refers to an area of an orthogonal projection of the through-hole 131 in the third direction.
In these alternative embodiments, when the total area S2 of the through-holes 131 is within the above range, it is possible to improve the speed of the hot air or the active material passing through the through-holes 131, which is affected by the undersize of the through-holes 131; it is possible to improve the structural strength of the electrode collector 130, which is affected by the excessive size of the through-holes 131, and the connection strength between the electrode collector 130 and the end wall 111.
In some embodiments of the present application, as shown in fig. 4 to 9, the case 110 further includes an opening opposite to the end wall 111 and an end cap 150 covering the opening, the end cap 150 is provided with an electrode terminal 151, the electrode assembly 120 further includes a second electrode tab 123 extending from the electrode body 121 toward the end cap 150, and the second electrode tab 123 and the electrode terminal 151 are connected to each other.
In these embodiments, the electrode assembly 120 may be placed into the case 110 through an opening of the case 110. The second tab 123 is coupled to the electrode terminal 151 of the end cap 150 such that the second tab 123 is insulated from the case 110 and the first tab 122 is coupled to the end wall 111 of the case 110, which improves the short circuit coupling of the first tab 122 and the second tab 123.
Optionally, the battery cell 100 may further include an adaptor member 160, and the second tab 123 is connected to each other through the adaptor member 160 and the electrode terminal 151.
Optionally, the electrode terminal 151 is mounted on the end cap 150 through an insulating member 170, and a liquid injection hole is formed in the electrode terminal 151 and provided with a liquid injection cap 180.
In some embodiments of the present application, a battery including the battery cell of any of the above embodiments is also provided in embodiments of the present application.
In some embodiments of the present application, an electrical device is further provided in the embodiments of the present application, including the battery of any of the above embodiments, where the battery is used to provide electrical energy.
The powered device may be any of the aforementioned battery-powered devices or systems.
Referring to fig. 4 to 9, an embodiment of the present application provides a battery cell 100, where the battery cell 100 includes a case 110, and an electrode assembly 120 and an electrode collector 130 located in the case 110. The housing 110 includes an end wall 111 and a side wall 112, and the end wall 111 and the side wall 112 enclose to form an accommodating space; the electrode assembly 120 is located in the receiving space, the electrode assembly 120 including an electrode body 121 and a first tab 122 protruding from the electrode body 121 toward the end wall 111; an electrode collector 130 is located between the first tab 122 and the end wall 111 and serves to connect the tab and the end wall 111, and the electrode collector 130 includes a through-hole 131 disposed therethrough. The first tab 122 is a negative tab. The electrode collector 130 includes a body portion 132 and a connection portion 133, the connection portion 133 is formed to protrude toward the end wall 111 with respect to the body portion 132, and the electrode collector 130 is connected to the end wall 111 through the connection portion 133. The end wall 111 is provided with a relief mechanism 140, and the connecting portion 133 is connected to the relief mechanism 140. The connecting portion 133 is disposed near the center of the pressure relief mechanism 140, and the edge of the pressure relief mechanism 140 surrounds the connecting portion 133 and is spaced apart from the connecting portion 133. The plurality of through holes 131 are adjacent to the connection portion 133 and are provided at intervals on the circumferential side of the connection portion 133. A fan 134 is formed between two adjacent through holes 131, and the fan 134 is protruded from the connecting portion 133 in a direction away from the end wall 111. The extension of the fan blade 134 in the circumferential direction of the connecting portion 133 gradually increases in a direction away from the connecting portion 133. The extension of the through-hole 131 in the circumferential direction of the connecting portion 133 gradually increases in a direction away from the connecting portion 133. The connecting portion 133 is circular, and the diameter of the connecting portion 133 is 3 mm-10 mm.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not depart from the spirit of the embodiments of the present application, and they should be construed as being included in the scope of the claims and description of the present application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (15)

1. A battery cell, comprising:
the shell comprises an end wall and a side wall, and the end wall and the side wall enclose to form an accommodating space;
an electrode assembly located in the receiving space, the electrode assembly including an electrode main body and a first tab projecting from the electrode main body toward the end wall;
and the electrode current collector is positioned between the first lug and the end wall and used for connecting the lug and the end wall, and the electrode current collector comprises a through hole which penetrates through the electrode current collector.
2. The battery cell as recited in claim 1, wherein the electrode current collector includes a body portion and a connection portion that is formed to protrude toward the end wall relative to the body portion, the electrode current collector being connected to the end wall by the connection portion.
3. The battery cell as recited in claim 2, wherein the end wall is provided with a pressure relief mechanism, and the connecting portion is connected to the pressure relief mechanism.
4. The battery cell as recited in claim 3, wherein an edge of the pressure relief mechanism surrounds a peripheral side of the connecting portion and is spaced apart from the connecting portion.
5. The battery cell as recited in claim 3 wherein at least one of the through holes is adjacent to the connection portion.
6. The battery cell as recited in claim 5, wherein a plurality of the through-holes are provided adjacent to the connection portion and spaced apart on a peripheral side of the connection portion.
7. The battery cell as recited in claim 6, wherein a fan is formed between two adjacent through holes, and the fan is protruded from the connecting portion in a direction away from the end wall.
8. The battery cell as recited in claim 7, wherein the fan blades have an increasing extension in a circumferential direction of the connecting portion in a direction away from the connecting portion.
9. The battery cell as recited in claim 7, wherein the connecting portion is circular, and an area S1 of the fan and the connecting portion satisfies the following relation:
Figure 458248DEST_PATH_IMAGE001
wherein d is the diameter of the connecting part, a is the thickness of the connecting part, n is the number of the fan blades, theta is the radian of the arc line of the connecting part and the connecting position of the fan blades, and S1 is 3mm 2 ~20mm 2 。
10. The battery cell as recited in claim 5, wherein the through-hole has an increasing extension in the circumferential direction of the connection portion in a direction away from the connection portion.
11. The battery cell as claimed in claim 2, wherein the connecting portion is circular and has a diameter of 3mm to 10 mm.
12. The battery cell according to claim 1, wherein the total area S2 of the through-holes is 20mm 2 ~300mm 2 。
13. The battery cell as recited in claim 1, wherein the case further includes an opening opposite to the end wall and an end cap covering the opening, the end cap being provided with an electrode terminal, the electrode assembly further including a second tab extending from the electrode body toward the end cap, the second tab being interconnected with the electrode terminal.
14. A battery comprising the battery cell of any one of claims 1-13.
15. An electrical device comprising a cell according to any one of claims 1 to 13 for providing electrical energy.
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