CN115693049A - Battery cell, battery and power consumption device - Google Patents

Battery cell, battery and power consumption device Download PDF

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Publication number
CN115693049A
CN115693049A CN202110853188.4A CN202110853188A CN115693049A CN 115693049 A CN115693049 A CN 115693049A CN 202110853188 A CN202110853188 A CN 202110853188A CN 115693049 A CN115693049 A CN 115693049A
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CN
China
Prior art keywords
current collecting
notch
insulating film
side wall
electrode assembly
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.)
Granted
Application number
CN202110853188.4A
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Chinese (zh)
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CN115693049B (en
Inventor
李周富
龙熙桂
李白清
史东洋
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Contemporary Amperex Technology Co Ltd
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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.)
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Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to CN202110853188.4A priority Critical patent/CN115693049B/en
Priority to CN202310844543.0A priority patent/CN116780125A/en
Priority to PCT/CN2022/098446 priority patent/WO2023005464A1/en
Publication of CN115693049A publication Critical patent/CN115693049A/en
Application granted granted Critical
Publication of CN115693049B publication Critical patent/CN115693049B/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
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/597—Protection against reversal of polarity
    • 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)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The embodiment of the application relates to the technical field of batteries and provides a battery monomer, a battery and an electric device. The battery cell includes: an electrode assembly; the insulating part comprises a bottom wall and a side wall, the bottom wall and the side wall are enclosed to form a groove, and the opening of the groove faces the electrode assembly; a current collecting member for electrically connecting with the electrode assembly, at least a portion of the current collecting member being fixed in the groove; an insulating film attached to an inner surface of the current collecting member, the inner surface of the current collecting member facing the electrode assembly; the side wall is provided with a first notch, and the first notch is used for enabling at least part of the insulating film to extend into the groove through the first notch so as to be attached to the inner surface of the current collecting component. Through the mode, the insulating film is not easy to wrinkle when the insulating film is attached on the current collecting member, the risk that the exposed area of the inner surface of the current collecting member facing to the electrode assembly still exists after the insulating film is attached is reduced, and therefore the risk that the battery monomer generates internal short circuit is reduced.

Description

Battery cell, battery and power consumption device
Technical Field
The embodiment of the application relates to the technical field of batteries, in particular to a battery monomer, a battery and an electric device.
Background
The battery cell is widely used in electronic devices such as a mobile phone, a notebook computer, a battery car, an electric airplane, an electric ship, an electric toy car, an electric toy ship, an electric toy airplane, an electric tool, and the like. The battery monomer can comprise a cadmium-nickel battery monomer, a hydrogen-nickel battery monomer, a lithium ion battery monomer, a secondary alkaline zinc-manganese battery monomer and the like.
In the development of battery technology, safety problems are a considerable problem, and particularly, when a short circuit occurs inside a battery cell, a serious safety accident is easily caused. Therefore, how to reduce the probability of the internal short circuit of the battery cell to improve the safety performance of the battery cell is a problem that has been receiving much attention in the field.
Disclosure of Invention
In view of the above problems, embodiments of the present application provide a battery cell, a battery and an electric device, which can reduce the probability of internal short circuit of the battery cell and improve the safety performance of the battery cell.
According to a first aspect of embodiments of the present application, there is provided a battery cell including: an electrode assembly; the insulating part comprises a bottom wall and a side wall, the bottom wall and the side wall are enclosed to form a groove, and the opening of the groove faces the electrode assembly; a current collecting member for electrically connecting with the electrode assembly, at least a portion of the current collecting member being fixed in the groove; an insulating film attached to an inner surface of the current collecting member, the inner surface of the current collecting member facing the electrode assembly; the side wall is provided with a first notch, and the first notch is used for enabling at least part of the insulating film to extend into the groove through the first notch so as to be attached to the inner surface of the current collecting component.
In the battery monomer of this application embodiment, through set up first breach at the lateral wall of insulating part for the insulating film can stretch into in the recess through first breach and attach, has reduced because insulating film and recess lateral wall take place to interfere and lead to the probability of insulating film wrinkling, still has the risk of naked region after attaching the insulating film with the internal surface that reduces the mass flow component towards electrode subassembly, thereby reduces the internal short circuit risk that this internal surface of mass flow component and the pole piece contact of another utmost point caused, has improved battery monomer's security performance.
In some embodiments, a bottom surface of the first notch is flush with the bottom wall of the insulator.
Through making the bottom surface of first breach and the diapire of insulator flush for the insulating film that stretches into through first breach can directly be attached to the internal surface of collecting the current component, with reduce the insulating film just because the probability of interference and wrinkling when stretching into, avoid influencing the further attached of follow-up insulating film.
In some embodiments, the side walls include a first side wall disposed along a length direction of the insulating member and a second side wall disposed along a width direction of the insulating member, and the first notch is disposed at an end of the first side wall close to the second side wall.
Through setting up first breach in the one end that first lateral wall is close to the second lateral wall for the insulating film can be through stretching into first breach in order to be close to the tip of collecting the current component and carry out attached, so that it is more convenient to make attached insulating film.
In some embodiments, the current collecting member includes a body portion and a bent portion formed by bending at an end of the body portion close to the second sidewall, the body portion is fixed in the groove, the bent portion extends outward from the groove, an inner surface of the bent portion faces the electrode assembly, and at least a portion of the insulating film is attached to the inner surface of the bent portion.
When the current collecting member has a structure including the body part and the bent part, if there is an exposed region on the inner surface of the bent part facing the electrode assembly, the internal short circuit of the battery cell may also occur, and by attaching the insulating film to the inner surface of the bent part, the probability of the exposed region on the bent part may be reduced, thereby improving the safety of the battery cell.
In some embodiments, the width of the first notch is greater than or equal to the thickness of the insulating film in the length direction of the insulating member.
When the insulating film is attached to the inner surface of the bending part, the body part is fixed in the groove, the inner surface of one end of the bending part, which is close to the body part, is easy to be difficult to be completely attached due to the interference between the side wall of the groove and the insulating film, the width of the first notch is larger than or equal to the thickness of the insulating film, and the insulating film can extend into the first notch to be attached to the inner surface of one end of the bending part, which is close to the body part.
In some embodiments, the side of the first notch facing the second side wall is closer to the second side wall than the inner surface of the bent portion in the length direction of the insulating member.
The side face of the first notch facing the second side wall is arranged to be closer to the second side wall than the inner surface of the bending part, so that the insulating film does not interfere with the side wall of the groove to wrinkle in the process that the insulating film is close to the inner surface of the bending part after extending into the groove, and the phenomenon that the area is exposed when the inner surface of the bending part is attached is reduced.
In some embodiments, along the width direction of the insulating member, at least a partial projection of the first sidewall covers a surface of the bent portion facing the first sidewall.
In such an embodiment, on the basis of the first notch, a part of the first side wall still remains at the boundary area of the second side wall and the first side wall, and the part of the first side wall can play a role in positioning in the installation process of the current collecting member, so that the current collecting member does not deviate along the width direction of the insulating member.
In some embodiments, the bending portion includes a first end near the bottom wall, and second notches are disposed at two sides of the first end near the first side wall.
When the insulating film extends into the first notch and is close to the inner surface of the bending part for attachment, the insulating film is easy to interfere with the side surface of the first notch, which faces the second side wall, to wrinkle, and when the wrinkled insulating film is attached to the bending part, exposed areas are easy to be generated at two sides of the first end, which are close to the first side wall, therefore, by arranging the second notch, the probability of the exposed areas can be reduced, and the safety of the battery monomer is improved.
In some embodiments, at least a portion of the second notch extends beyond the first sidewall in the extending direction of the bent portion.
When the insulating film is attached to the inner surfaces of the bent portions, since the insulating film easily interferes with the first side walls, by making at least a portion of the second notch exceed the first side walls, a partial region that is easily exposed due to wrinkling of the insulating film is covered with the second notch, so that the safety of the battery cell is improved.
According to a second aspect of the embodiments of the present application, there is provided a battery including the battery cell of the above-described embodiments.
According to a third aspect of the embodiments of the present application, there is provided an electric device including the battery of the above embodiments, wherein the battery is used for providing 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
Features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;
fig. 2 is an exploded schematic view of a battery provided by some embodiments of the present application;
fig. 3 is a schematic structural view of the battery module in fig. 2;
fig. 4 is an exploded schematic view of a battery cell provided by some embodiments of the present application;
FIG. 5 is a schematic structural view of the electrode assembly of FIG. 4;
FIG. 6 is a schematic view of the mating of an insulator film and a current collecting member provided by some embodiments of the present application;
FIG. 7 is a schematic view of the insulator of FIG. 4;
FIG. 8 is an enlarged view of a portion of FIG. 7 at K;
fig. 9 is a schematic illustration of the mating of a current collecting member and an insulator provided by some embodiments of the present application;
FIG. 10 is an enlarged view of a portion of FIG. 9 at M;
fig. 11 is a partial enlarged view at N in fig. 9.
In the drawings, the drawings are not necessarily drawn to scale.
Reference numerals:
1-vehicle, 2-battery pack, 3-controller, 4-motor, 5-box and 6-battery module;
51-a first tank portion, 52-a second tank portion, 53-an accommodation space;
7-battery cell;
71-electrode assembly, 71 a-first tab, 71 b-second tab;
72-insulation, 721-groove, 722-bottom wall, 723-side wall, 723 a-first side wall, 723 b-second side wall, 723 c-first gap;
73-a current collecting member, 731-a body portion, 732-a bending portion, 732 a-a first end, 732 b-a second notch;
74-an insulating film;
75-a housing;
76-end cap;
S 1 inner surface of current collecting member, S 2 Bottom surface of first indentation, S 3 Inner surface of the bend, S 4 The first notch is close to the side of the bend, S 5 -a surface of the fold facing the first side wall;
d1-width of the first notch, D2-width of the insulating film;
x-the length direction of the insulator, Y-the width direction of the insulator, and Z-the height direction of the insulator.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that technical terms or scientific terms used in the embodiments of the present application should be understood as having a common meaning as understood by those skilled in the art to which the embodiments of the present application belong, unless otherwise specified.
In the description of the embodiments of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships that are based on the orientations and positional relationships shown in the drawings, and are used for convenience in describing the embodiments of the present application and for simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit indication of the number of technical features indicated, nor used to describe a particular order or primary-secondary relationship. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase 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. One skilled in the art will appreciate that the embodiments described herein can be combined with other embodiments.
The term "and/or" herein is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships. For example, "a and/or B" may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The "plurality" appearing in the present application means two or more (including two), and similarly, "plural" means two or more (including two), and "plural" means two or more (including two).
In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
In the conventional battery cell structure, current collecting members having different polarities are generally provided to connect tabs of different poles of an electrode assembly and electrode terminals of different poles on end caps, respectively. However, since the surface of the current collecting member facing the electrode assembly is not completely used for connection with the tabs of the electrode assembly, but there is a portion of the surface exposed toward the electrode assembly, when a portion of the electrode tab in the electrode assembly protrudes and contacts the exposed surface, or when one end of metal debris in the battery cell contacts the current collecting member and the other end protrudes into the electrode assembly and contacts the electrode tab, internal short circuits of the battery cell are easily caused, causing thermal runaway of the battery cell and safety accidents.
Based on this, for the existing battery cell, it is usually necessary to attach a layer of insulating film on the inner surface of the current collecting member to avoid the current collecting member electrically connecting with another pole to cause internal short circuit of the battery cell, however, in order to obtain the maximum flow area on the current collecting member, the width of the current collecting member and the size of the insulator assembled on the inner surface of the end cover are usually made to be close, which also makes the insulating film easily interfere with partial structure of the insulator such as the side wall when attaching the insulating film, thereby causing the insulating film to wrinkle, and finally causing the inner surface of the current collecting member to have a partially exposed area, so that the battery cell still has the risk of internal short circuit.
In view of this, the present disclosure provides a battery cell, in which an insulating member provided with a first notch is adopted, at least a portion of an insulating film can be extended into a groove through the first notch to attach a surface of a current collecting member facing an electrode assembly, and the insulating film is not easily wrinkled due to interference with the insulating member during attachment, so as to reduce a probability that the surface of the current collecting member facing the electrode assembly is exposed to the electrode assembly, thereby reducing a probability that the battery cell has an internal short circuit, and improving safety of the battery cell.
The battery cell described in the embodiment of the present application is suitable for a battery and an 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.
For convenience of explanation, the following embodiments will be described with an electric device as an example of a vehicle.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1 according to some embodiments of the present disclosure. As shown in fig. 1, a battery 2 is disposed inside a vehicle 1, and the battery 2 refers to a single physical module including one or more battery cells to provide higher voltage and capacity, for example, the battery 2 mentioned in this application may include a battery module or a battery pack, etc. The battery 2 may be disposed at the bottom or the head or the tail of the vehicle 1. The battery 2 may be used for power supply of the vehicle 1, and for example, the battery 2 may serve as an operation power source of the vehicle 1. The vehicle 1 may further comprise a controller 3 and a motor 4, the controller 3 being adapted to control the battery 2 to power the motor 4, e.g. for start-up, navigation and operational power demands while driving of the vehicle 1.
In some embodiments of the present application, the battery 2 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.
Referring to fig. 2, fig. 2 is an exploded view of a battery 2 according to some embodiments of the present disclosure.
As shown in fig. 2, the battery 2 includes a case 5 and a battery module 6, and the battery module 6 is accommodated in the case 5.
The case 5 is used to house the battery modules 6, and the case 5 may have various structures. In some embodiments, the box body 5 may include a first box body portion 51 and a second box body portion 52, the first box body portion 51 and the second box body portion 52 cover each other, and the first box body portion 51 and the second box body portion 52 together define a receiving space 53 for receiving the battery module 6. The second casing part 52 may be a hollow structure with one open end, the first casing part 51 may be a plate-shaped structure, and the first casing part 51 covers the open side of the second casing part 52 to form the casing 5 with the accommodating space 53; the first tank portion 51 and the second tank portion 52 may be hollow structures each having one side opened, and the open side of the first tank portion 51 may cover the open side of the second tank portion 52 to form the tank 5 having the accommodating space 53. Of course, the first and second casing portions 51 and 52 may be various shapes, such as a cylinder, a rectangular parallelepiped, or the like.
In order to improve the sealing property after the first casing portion 51 and the second casing portion 52 are connected, a sealing member, such as a sealant or a gasket, may be provided between the first casing portion 51 and the second casing portion 52.
Assuming that the first box portion 51 covers the top of the second box portion 52, the first box portion 51 may also be referred to as an upper box cover, and the second box portion 52 may also be referred to as a lower box body.
In the battery 2, the battery cell 7 (not shown in the figure) is plural. The plurality of battery cells 7 may be connected in series, in parallel, or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the plurality of battery cells 7. The plurality of battery monomers 7 can be directly connected in series or in parallel or in series-parallel, and the whole formed by the plurality of battery monomers 7 is accommodated in the box body 5; of course, a plurality of battery cells 7 may be connected in series, in parallel, or in series-parallel to form a battery module 6, and a plurality of battery modules 6 may be connected in series, in parallel, or in series-parallel to form a whole and accommodated in the box 5.
Fig. 3 is a schematic structural view of the battery module 6 in fig. 2. As shown in fig. 3, in some embodiments, there are a plurality of battery cells 7, and the plurality of battery cells 7 are connected in series or in parallel or in series-parallel to form the battery module 6. The plurality of battery modules 6 are connected in series or in parallel or in series-parallel to form a whole and are accommodated in the case.
Referring to fig. 4 to 7, the present embodiment provides a battery cell 7, where the battery cell 7 includes an electrode assembly 71, an insulating member 72, a current collecting member 73, and an insulating film 74. The insulating member 72 includes a bottom wall 722 and a side wall 723 that enclose a groove 721, the groove 721 being open to the electrode assembly 71. The current collecting member 73 is used to be electrically connected to the electrode assembly 71, and at least a portion of the current collecting member 73 is fixed in the groove 721. The insulating film 74 is for attaching to the inner surface S of the current collecting member 73 1 And an inner surface S of the current collecting member 73 1 Toward the electrode assembly 71. A first notch 723c is provided on the side wall 723 forming the groove 721, the first notch 723c being for causing at least a part of the insulating film 74 to protrude into the groove 721 via the first notch 723c to adhere to the inner surface S of the current collecting member 73 1 。
In some embodiments of the present application, the battery cell 7 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, a magnesium ion battery cell, or the like, which is not limited in this embodiment. The battery cells 7 may have a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which are not limited in the embodiments of the present application, and for convenience of description, the cylindrical battery is exemplified in the following embodiments. The battery cells 7 are generally divided into three types in an encapsulated manner: the cylindrical battery monomer, the square battery monomer and the soft package battery monomer are also not limited in the embodiment of the application.
In some embodiments of the present application, please refer to fig. 4, and fig. 4 is an exploded schematic view of a battery cell 7 according to some embodiments of the present application. The battery cell 7 may include an electrode assembly 71, an insulator 72, a current collecting member 73, a case 75, an end cap 76, and an electrolyte (not shown in the drawings), and the electrode assembly 71 may include a positive electrode tab, a negative electrode tab, and a separator (none of the positive electrode tab, the negative electrode tab, and the separator is shown in the drawings). The battery cell 7 mainly depends on metal ions moving 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 electrode current collector includes a positive electrode current collector portion coated with a positive electrode active material 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 electrode current collector includes a negative electrode current collector portion coated with a negative electrode 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).
In addition, the electrode assembly 71 may have a winding structure or a lamination structure, and the embodiment of the present application is not limited thereto. The case 75 may have an opening at one end or openings at both ends, and the end cap 76 covers the opening of the case 75 to form a receiving space for receiving the electrode assembly 71 and the electrolyte together with the case 75. Alternatively, the housing 75 and the end cap 76 may be made of the same material, for example, the housing 75 and the end cap 76 may be made of aluminum, so that the housing 75 and the end cap 76 may be welded conveniently, or the housing 75 and the end cap 76 may be made of different materials, for example, the housing 75 and the end cap 76 may be made of different metals, and the housing 75 and the end cap 76 may be connected by using other connecting methods such as riveting.
Referring to fig. 5, fig. 5 is a schematic structural diagram of the electrode assembly 71 in fig. 4. The electrode assembly 71 includes at least two tabs (a first tab 71a and a second tab 71b are shown, and the first tab 71a and the second tab 71b are also exemplified below), which have opposite polarities, and the first tab 71a and the second tab 71b are respectively a positive tab and a negative tab, which may be both located at one end of the electrode assembly 71 or both ends of the electrode assembly 71. The first tab 71a and the second tab 71b are used to connect current collecting members 73 of different polarities, respectively, and optionally, the first tab 71a and the second tab 71b may be connected to the current collecting members 73 by welding.
Referring to fig. 4 and 5, the current collecting member 73 is generally disposed between the insulator 72 and the electrode assembly 71, corresponding to the first tab 71a and the second tab 71b of the electrode assembly 71, two current collecting members 73 may be provided for electrically connecting the first tab 71a and the second tab 71b with electrode terminals of different polarities on the end cap 76, respectively, and the current collecting member 73 may be made of a metal material, for example, when the first tab 71a and the second tab 71b are made of copper and aluminum, respectively, and correspondingly, the two current collecting members 73 may also be made of copper and aluminum, respectively. In the particular embodiment shown in the figures, the current collecting member 73 is a sheet-like structure. It should be understood by those skilled in the art that in other embodiments, the current collecting member 73 may have other shapes, such as a plate-like, block-like structure. When the current collecting member 73 is mounted to the battery cell 7, at least a part of the current collecting member 73 may be fixed in the groove 721, or the entire current collecting member 73 may be fixed in the groove 721, for example, when the current collecting member 73 has a flat plate-like structure, it may be fixed by welding one end of the current collecting member 73 into the groove 721, and the current collecting member 73 may be entirely located in the groove; for another example, when the current collecting member 73 has a bent structure, it is possible to allow the current collecting member 73 to partially protrude out of the groove 721 after being fixed to the groove 721.
Continuing to refer to fig. 6, fig. 6 is a schematic diagram of the combination of the insulating film 74 and the current collecting member 73 according to some embodiments of the present disclosure. On the inner surface S of the current collecting member 73 1 An insulating film 74 may be attached, and an inner surface S of the current collecting member 73 1 Referring to the surface of the current collecting member 73 facing the electrode assembly 71, as shown, an insulating film 74 may be attached to a portion of the inner surface of the current collecting member 73 where no tab is welded, to prevent the portion of the inner surface from being in direct contact with another pole piece in the electrode assembly 71 to form a short circuit, or from being electrically connected with another pole piece in the electrode assembly 71 to form a short circuit under indirect overlapping of metal debris. The insulating film 74 is made of an insulating material, such as polyethylene terephthalate (PET). The surface of the insulating film 74 may have appropriate adhesiveness so that the insulating film 74 may be well attached to the inner surface S of the current collecting member 73 1 . In the embodiment of the present application, the insulating film 74 with or without adhesiveness may be selected and an adhesive may be applied to the surface thereof, or an adhesive may be applied to the inner surface of the current collecting member 73, to facilitate the attachment of the insulating film 74.
Referring to fig. 7, fig. 7 is a schematic structural diagram of the insulating member 72 in fig. 4. The insulating member 72 refers to a member mounted inside the end cap 76 and serving to insulate the end cap 76 and the electrode assembly 71 from each other. The insulating member 72 may be made of an insulating material such as plastic, and in the embodiment shown in the drawings, the bottom wall 722 and the side wall 723 of the insulating member 72 are both plate-shaped structures, and enclose to form a square groove 721, and the opening of the groove 721 faces the electrode assembly 71. It will be appreciated by those skilled in the art that in other embodiments, the bottom wall 722 and the side wall 723 may have other shapes, such as block-shaped or arc-shaped structures, as long as they enclose the groove 721. The depth of the groove 721 is such that the current collecting member 73 can be received in the groove 721. It will be understood by those skilled in the art that the bottom wall 722 and the side wall 723 may be a unitary structure, such as the insulator 72 with the groove 721 formed by a turning, milling or stamping process, or the insulator 72 with the groove 721 formed by a molding process, i.e., the bottom wall 722 and the side wall 723 are integrally formed. In other embodiments, the bottom wall 722 and the sidewall 723 may be separate components that are integrally connected to form the insulator 72 with the recess 721. The connection means may be a threaded connection, for example, a bolt, a screw, or other connecting members fixedly connecting the bottom wall 722 and the side wall 723; the attachment means may also be gluing, for example by means of an adhesive, to integrate the bottom wall 722 and the side wall 723. After the insulator 72 is mounted to the battery cell 7, a part of the insulator 72 may abut against the surface of the electrode assembly 71 facing the end cap 76, so that, when the battery cell 7 encounters shaking, vibration, or the like, the insulator 72 can provide a certain supporting force to the electrode assembly 71, so that the electrode assembly 71 placed in the case 75 is not easily displaced to affect the connection stability of the tabs and the current collecting members 73.
The groove 721 is defined by a bottom wall 722 and a sidewall 723, the bottom wall 722 is used for being adhered to the inner surface of the end cap 76 when being installed, the sidewall 723 may be formed by extending the edge of the bottom wall 722 towards the electrode assembly 71, and the sidewall 723 may be distributed at intervals on the edge of the bottom wall 722 and directly abut against the electrode assembly 71 to reduce the sloshing thereof. The sidewall 723 is provided with a first notch 723c, and the first notch 723c is a structure that penetrates the sidewall 723 in a thickness direction of the sidewall 723 (the same as the height direction Z of the insulating member 72) and is formed by extending from the top to the bottom of the sidewall 723, and the structure may be used to make at least a part of the insulating film 74 protrude into the groove 721 via the first notch 723c to attach to the inner surface S of the current collecting member 73 1 . In the specific embodiment shown in the drawings, the projection shape of the first notch 723c in the width direction Y of the insulating member 72 is a rectangle. The rectangular notch is regular in shape and easy to process; and the dimension of the rectangular notch along the height direction Z of the insulating member 72 is relatively close, so that the insulating film 74 can conveniently extend into the groove 721 along the height direction Z of the insulating member 72 for attaching, and the wrinkling probability of the insulating film 74 is reduced. Those skilled in the artIt should be understood that the illustration is merely an example, and in other embodiments, the projection shape of the first notch 723c along the length direction Y of the insulating member 72 (the cross-sectional shape in the plane xoz) may also be a triangle, a trapezoid, a sector, and other shapes, which are not limited in this application. The first notch 723c may be formed on the sidewall 723 by turning, milling, or the like, or the sidewall 723 with the first notch 723c may be formed by molding.
By providing the first notch 723c on the side wall 723 of the insulating member 72, the insulating film 74 can extend into the groove 721 through the first notch 723c to attach the current collecting member 73, the insulating film 74 is not easily wrinkled during the attaching process, so that the flat insulating film 74 can cover the inner surface of the current collecting member 73 facing the electrode assembly 71 as much as possible, the risk of the inner surface of the current collecting member 73 facing the electrode assembly 71 having an exposed area is reduced, the risk of an internal short circuit caused by the contact of the inner surface of the current collecting member 73 with another pole is reduced, and the safety of the battery cell 7 is improved.
In some embodiments of the present application, please continue to refer to fig. 7, the sidewall 723 may include a first sidewall 723a disposed along the length direction X of the insulating member 72 and a second sidewall 723b disposed along the width direction Y of the insulating member 72, and the first notch 723c is disposed at an end of the first sidewall 723a close to the second sidewall 723b.
In the battery cell 7, two current collecting members 73 for respectively connecting tabs and electrode terminals of different polarities are generally located at both ends of the inner surface of the insulating member 72, and therefore, when attaching the insulating film 74 from the end of the current collecting member 73 near the second side wall 723b, a first notch 723c may be provided at one end of the first side wall 723a near the second side wall 723b, so that the insulating film 74 can be attached near the end of the current collecting member 73 by protruding into the first notch 723c, reducing the possibility of interference between the insulating film 74 and the first side wall 723a during the attaching process. Alternatively, since the insulating film 74 is attached to both ends of the inner surface of the insulating member 72, the first notches 723c may be provided at both ends of the insulating member 72. The first notch 723c may also be provided according to the installation position of the current collecting member 73, which is not limited in the present application.
In some embodiments of the present application, please refer to fig. 7 and 8, fig. 8 is a partial enlarged view at K in fig. 7. Along the height direction Z of the insulating member 72, the bottom surface S of the first notch 723c 2 Flush with the bottom wall 722 of the insulator 72. Bottom surface S of the first notch 2 Flush with the bottom wall 722 of the insulator 72 means the bottom surface S of the first gap 2 The height in the Z direction shown in the drawing is equal to or substantially equal to the height of the bottom wall 722 of the insulating member 72, and is not strictly flush, and it can be considered that a portion of the side wall corresponding to this position is removed. Since the current collecting member 73 is attached to the bottom wall 722 of the insulator 72, the inner surface S of the current collecting member 73 1 In the groove 721 is higher than the bottom wall 722 of the insulating member 72 so that the insulating film 74 is extended into the first notch 723c to adhere to the inner surface S of the current collecting member 73 1 And, the wrinkles do not occur by interference with the first side wall 723a, thereby reducing the probability of the wrinkles of the insulating film 74 and improving the safety of the battery cell 7.
In some embodiments of the present application, please refer to fig. 9, fig. 9 is a schematic view of the combination of the current collecting member 73 and the insulating member 72 provided in some embodiments of the present application. The current collecting member 73 includes a main portion 731 and a bent portion 732 formed by bending an end of the main portion 731 close to the second side wall 723b, the main portion 731 is fixed in the recess 721, the bent portion 732 extends outward from the recess 721, an inner surface (covered by the insulating film 74 in the figure, not shown) of the bent portion 732 faces the electrode assembly 71, and at least a portion of the insulating film 74 is attached to an inner surface S of the bent portion 732 3 。
When the current collecting member 73 includes the bent structure, the body portion 731 refers to a portion of the current collecting member 73 extending in the length direction X of the insulator 72 and used to be attached inside the groove 721 of the insulator 72. Different from the body portion 731, the bent portion 732 is a portion of the current collecting member 73 bent at an end of the body portion 731 close to the second side wall 723b, and the bent portion 732 extends outward from the inside of the groove 721. In these embodiments, the current collecting member 73 is adapted to the electrode assembly 71 in which the first tab 71a and the second tab 71b are respectively disposed at both ends (neither the first tab 71a nor the second tab 71b is shown in the drawings), and particularly, the bent portion 732 is used for connection with the first tab 71a or the second tab 71b, and alternatively, the first tab 71a or the second tab 71b may be welded to a surface of the bent portion 732 facing away from the electrode assembly 71. In this way, the insulating film 74 may be further attached to the surface of the bent portion 732 facing the electrode assembly 71 to prevent the inner surface of the bent portion 732 from forming an internal short circuit with the electrode assembly.
It will be understood by those skilled in the art that the body portion 731 and the bent portion 732 may be a unitary structure, for example, the bent portion 732 is a structure in which the body portion 731 itself is bent at an end near the second side wall 723b, that is, the body portion 731 and the bent portion 732 are integrally formed. It should be understood by those skilled in the art that the illustration is merely an example, and in other embodiments, the body portion 731 and the bent portion 732 may be a multi-piece structure, for example, the body portion 731 and the bent portion 732 are disposed at an angle to each other and fixed together by an electrical connector, and finally assume a bent configuration as shown in fig. 9. The electrical connectors may be bolts, screws, or other conductive metal connectors, which not only fix the body portion 731 and the bending portion 732, but also perform an electrical connection effect.
In the embodiment shown in the figures, the bending angle between the body portion 731 and the bending portion 732 is 90 degrees. It should be understood by those skilled in the art that the illustration is merely exemplary, and in other embodiments, the included angle between the body portion 731 and the bent portion 732 may be substantially 90 degrees, or other angles that can better fit between the insulating member 72 and the electrode assembly 71.
In the embodiment shown in the figures, the body portion 731 and the bent portion 732 are each substantially plate-shaped. It should be understood by those skilled in the art that the body portion 731 and the bent portion 732 may have other shapes, such as a block structure, in other embodiments, as long as the structure facilitates electrical connection between the current collecting member 73 and the electrode assembly 71 and the electrode terminals. The outer surface of the bent portion 732 is electrically connected to the electrode assembly 71 and then connected to the electrode terminal of the battery cell 7 through the body portion 731 connected to the bent portion 732.
In some embodiments of the present application, please refer to fig. 9 and 10, fig. 10 is at M in fig. 9A partial enlarged view. The minimum width D of the first gap 723c in the length direction X of the insulating member 72 1 Greater than or equal to the maximum thickness D of the insulating film 74 2 . Minimum width D of the first notch 723c along the X direction 1 That is, the narrowest portion through which the insulating film 74 is required to pass when vertically extending into the recess 721 is set to a size equal to or larger than the maximum thickness D of the insulating film 74 2 In this way, when the insulating film 74 is vertically extended into the groove 721 for attaching the current collecting member 73, it is possible to make the first side wall 723a not interfere with the insulating film 74 to cause wrinkling of the insulating film 74, thereby avoiding affecting the attaching effect of the insulating film 74. It will be appreciated by those skilled in the art that in other embodiments, the minimum width D of the first gap 723c may be 1 Is set to be much larger than the maximum thickness D of the insulating film 74 2 Thus, the requirement for control accuracy when the insulating film 74 is inserted is low, and handling of the film attaching apparatus or manual film attaching is facilitated.
In some embodiments of the present application, with continued reference to fig. 9 and 10, at one end of the insulator 72 along the length direction X, the inner surface S is compared to the bent portion 732 3 The side S of the first notch 723c facing the second side wall 723b 4 Closer to the second sidewall 723b.
The first notch 723c faces the side S of the second sidewall 723b 4 That is, one of two sides of the first notch 723c perpendicular to the length direction X of the insulating member 72, which is closer to the second sidewall 723b. By directing the first notch 723c to the side S of the second side wall 723b 4 An inner surface S of the bent portion 732 is provided 3 Closer to the second side wall 723b, so that a part of the bent portion 732 can be exposed through the first notch in the width direction Y of the insulating member 72, and thus the insulating film 74 after extending into the groove 721 and toward the inner surface S of the bent portion 732 3 In the approaching process, the wrinkles are not generated by interference with the side wall 723 of the groove 721, and the phenomenon that the area is exposed when the inner surface of the bent part 732 is attached can be reduced.
In some embodiments of the present application, please continue to refer to fig. 9 and 10, along the width direction Y of the insulating member 72, at least a portion of the first sidewall 723a covers the surface S of the bent portion 732 facing the first sidewall 723a 5 . At least part of the first sidewall 723a means that a first notch 723c opened on the first sidewall 723a does not extend to the second sidewall 723b along the length direction X of the insulating member 72, and a part of the first sidewall 723a is reserved on a side of the first notch 723c close to the second sidewall 723b, where the part may form a right-angle structure with the second sidewall 723b, may also form an arc-shaped corner structure, may also not form a connection with the second sidewall 723b, but has a gap. The partial first side wall 723a is formed at both ends of the bent portion 732 in the width direction Y of the insulating member 72 and sandwiches the bent portion 732, so that the partial first side wall 723a and the adjacent second side wall 723b can jointly play a role in positioning the current collecting member 73, and the current collecting member 73 can be made not to be easily displaced in the length direction X and the width direction Y of the insulating member 72 during installation, thereby facilitating installation.
In some embodiments of the present application, please refer to fig. 9 and 11, and fig. 11 is a partial enlarged view at N in fig. 9. The bent portion 732 includes a first end 732a near the bottom wall 722, and second notches 732b are disposed at two sides of the first end 732a near the first side wall 723a.
The second notches 732b are opened at two sides of the first end 732 on the bent portion 732, and in some embodiments, a projection shape of the second notch 732b along the length direction X of the insulating member 72 is rectangular. The rectangular notch is regular in shape and easy to process; it should be understood by those skilled in the art that the illustration is only an example, and in other embodiments, the projection shape of the second notch 732b along the length direction X of the insulating member 72 may also be a triangle, a trapezoid, a sector, and other shapes, which are not limited in the embodiments of the present invention. The second notch 732b may be formed on the first sidewall 723a by turning, milling, or the like, or the first sidewall 723a with the second notch 732b may be formed by die machining. Since the region of the bent portion 732 near the bottom wall 722 of the insulating member 72 is near the bent portion, the insulating film 74 is not easily attached, and the insulating film 74 is easily wrinkled. Alternatively, the second notch 732b may be extended to the bottom wall 722 of the insulating member 72 toward the bottom wall 722, so that a position where the insulating film 74 is not easily attached due to wrinkling may be removed, or the size of the insulating film 74 at the position may be reduced accordingly, to reduce the probability that the region is partially exposed when the insulating film 74 is wrinkled.
In some embodiments of the present application, please continue to refer to fig. 9, 10, and 11, in an extending direction of the bent portion 732 (the same as the height direction Z of the insulating member 72, which is shown in the Z direction), at least a portion of the second notch 732b extends beyond the second sidewall 723b.
The bent portion 732 extends outward from the notch 721, and the "extending direction of the bent portion 732" is a direction parallel to the height direction Z of the insulator 72, and does not strictly mean the extending direction of the bent portion 732. The phrase "at least a portion of the second notch 732b exceeds the second sidewall 723b" means that a projection of the second notch 732b along the length direction X of the insulating member 72 does not completely coincide with a projection of the second sidewall 723b, and a projection of a portion of the second notch 732b is located on a side of the second sidewall 723b, which is projected to be close to the electrode assembly 71. In this way, the insulating film 74 is attached to the inner surface S of the bent portion 732 3 At this time, since the insulating film 74 easily interferes with the first side wall 723a, by making at least part of the second notch 732b exceed the first side wall 723a, more regions that are easily exposed due to the wrinkle of the insulating film 74 are covered with the second notch 732b, to improve the safety of the battery cell 7.
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 (11)

1. A battery cell, comprising:
an electrode assembly;
the insulating piece comprises a bottom wall and a side wall, the bottom wall and the side wall enclose a groove, and the opening of the groove faces the electrode assembly;
the current collecting component is used for being electrically connected with the electrode assembly, and at least part of the current collecting component is fixed in the groove;
an insulating film attached to an inner surface of the current collecting member, the inner surface of the current collecting member facing the electrode assembly;
wherein the side wall is provided with a first notch, and the first notch is used for enabling at least part of the insulating film to extend into the groove through the first notch so as to be attached to the inner surface of the current collecting component.
2. The battery cell of claim 1, wherein a bottom surface of the first notch is flush with the bottom wall of the insulator.
3. The battery cell of claim 1, wherein a width of the first notch is greater than or equal to a thickness of the insulating film in a length direction of the insulating member.
4. The battery cell of any one of claims 1-3, wherein the side walls comprise a first side wall disposed along a length direction of the insulator and a second side wall disposed along a width direction of the insulator, and the first notch is disposed at an end of the first side wall adjacent to the second side wall.
5. The battery cell as recited in claim 4, wherein the current collecting member includes a body portion and a bent portion bent at an end of the body portion adjacent to the second side wall, the body portion is fixed in the groove, the bent portion extends outward from the inside of the groove, the inner surface of the bent portion faces the electrode assembly, and the insulating film is attached to the inner surface of the bent portion.
6. The battery cell as recited in claim 5, wherein a side of the first notch facing the second sidewall is closer to the second sidewall than the inner surface of the bent portion in the length direction of the insulating member.
7. The battery cell as recited in claim 5, wherein at least a partial projection of the first sidewall covers a surface of the bent portion facing the first sidewall in the width direction of the insulating member.
8. The battery cell as recited in claim 5, wherein the bent portion comprises a first end adjacent to the bottom wall, and second notches are disposed on two sides of the first end adjacent to the first side wall.
9. The battery cell as claimed in claim 8, wherein at least a portion of the second notch extends beyond the first sidewall in the extending direction of the bent portion.
10. A battery comprising a cell as claimed in any one of claims 1 to 9.
11. An electrical device comprising a battery as claimed in claim 10 for providing electrical energy.
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