CN220291038U - Battery cell, battery and electricity utilization device - Google Patents

Abstract

The application discloses a battery monomer, battery and power consumption device. The battery cell includes electrode assembly and insulating part, and the insulating part includes bottom insulation portion and side insulation portion, and the bottom insulation portion cladding electrode assembly's bottom, side insulation portion is connected and cladding electrode assembly's periphery with bottom insulation portion. The side insulating part includes a first side insulating part and a second side insulating part arranged along a circumferential direction of the electrode assembly, the first side insulating part being connected with the bottom insulating part with a gap therebetween. The insulating piece further comprises a sealing part, and the sealing part is connected with the bottom insulating part and seals the gap. The technical scheme provided by the application can improve the reliability of the battery.

Description

Battery cell, battery and electricity utilization device

Technical Field

The application relates to the technical field of batteries, in particular to a battery cell, a battery and an electric device.

Background

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

In the development of battery technology, how to improve the reliability of a battery is a technical problem to be solved in battery technology.

Disclosure of Invention

The application provides a battery monomer, battery and power consumption device, the technical scheme that this application provided can improve the reliability of battery.

The application is realized by the following technical scheme:

in a first aspect, the present application provides a battery cell including an electrode assembly and an insulating member, the insulating member including a bottom insulating portion and a side insulating portion, the bottom insulating portion covering the bottom of the electrode assembly, the side insulating portion being connected with the bottom insulating portion and covering the outer periphery of the electrode assembly. The side insulating part includes a first side insulating part and a second side insulating part arranged along a circumferential direction of the electrode assembly, the first side insulating part being connected with the bottom insulating part with a gap therebetween. The insulating piece further comprises a sealing part, and the sealing part is connected with the bottom insulating part and seals the gap.

In the above scheme, through setting up sealing part, can seal the clearance that forms between second side insulating part and the bottom insulating part by the insulating part to reduce electrode assembly and battery cell's shell overlap joint by this clearance exposure outward, lead to the risk of shell electric corrosion, and then make the battery have higher reliability.

According to some embodiments of the present application, an end of the sealing portion remote from the bottom insulating portion is provided with a chamfer.

In some embodiments, the sealing part may be connected with the bottom insulating part before the insulating member is coated on the electrode assembly. The sealing part may be bent along the interface with the bottom insulating part to close the gap when the insulating member covers the electrode assembly. In the above-mentioned scheme, through setting up the chamfer in the one end that the bottom insulation portion was kept away from at the sealing portion, can reduce the sealing portion when sealed clearance, because of the uneven or wrong one end that leads to the sealing portion to keep away from the bottom insulation portion to first side insulation portion skew of atress, lead to with first side insulation portion range upon range of and influence the risk of insulating part to electrode assembly's cladding effect for the battery monomer has good cladding quality, improves the reliability of battery.

According to some embodiments of the present application, the chamfer comprises a square chamfer or a triangular chamfer.

In the above scheme, through limiting the chamfer to square chamfer or triangle-shaped chamfer, can reduce the risk that sealing portion and first side insulating part overlap joint influence cladding effect effectively, improve the free cladding quality of battery, and then make the improvement battery have higher reliability.

According to some embodiments of the present application, the number of the first side insulating parts is two, and the two first side insulating parts are opposite and spaced apart. The second side insulating part comprises a first sub insulating part and a second sub insulating part, the first sub insulating part is connected with one of the two first side insulating parts, the second sub insulating part is connected with the other of the two first side insulating parts, the first sub insulating part is connected with the second sub insulating part, and gaps are reserved between the first sub insulating part and the bottom insulating part and between the second sub insulating part and the bottom insulating part.

In the scheme, through the arrangement of the two first side insulating parts, the peripheral wall of the electrode assembly can be effectively coated, and the insulating effect of the electrode assembly and the battery cell shell is improved. Meanwhile, the second side insulating part is arranged to comprise the first sub insulating part and the second sub insulating part, so that the first sub insulating part and the second sub insulating part are covered on the peripheral wall of the electrode assembly in a lap joint or interconnection mode, the difficulty of covering the electrode assembly by the insulating part is reduced, and the manufacturing efficiency of the battery is improved.

According to some embodiments of the present application, the sealing portions are located outside the first and second sub-insulation portions; or the first sub-insulating part and the second sub-insulating part are mutually overlapped, and the sealing part is positioned between the first sub-insulating part and the second sub-insulating part; or, the sealing portions are located inside the first sub-insulating portion and the second sub-insulating portion.

In the above scheme, the sealing part is provided with various positions, and can be arranged on the outer sides of the first sub-insulating part and the second sub-insulating part, can be arranged on the inner sides of the first sub-insulating part and the second sub-insulating part, and can be arranged between the first sub-insulating part and the second sub-insulating part, so that various choices are provided for the assembly process of the insulating part coated on the electrode assembly to adapt to different requirements.

According to some embodiments of the present application, the number of the second side insulating parts is two, and the first side insulating parts and the second side insulating parts are alternately arranged in the circumferential direction of the electrode assembly. The number of the sealing parts is two, and the two sealing parts respectively seal gaps between the two second side insulating parts and the bottom insulating part.

In some embodiments, the electrode assembly may be a square electrode assembly, the peripheral wall of which has four adjacently disposed wall surfaces. In the scheme, the two second side insulating parts are matched with the two second side insulating parts, so that the periphery of the electrode assembly can be effectively coated, and a good insulating effect is achieved between the electrode assembly and the shell. Simultaneously, through setting up two sealing parts to can seal effectively by two gaps that form between two second side insulating parts and the bottom insulating part, thereby reduce electrode assembly and expose outside and overlap joint with battery cell's shell by this clearance, lead to the risk of shell electric corrosion, and then make the battery have higher reliability.

According to some embodiments of the present application, in the circumferential direction of the electrode assembly, one of the first side insulating parts has a first end and a second end, and the other of the first side insulating parts has a third end and a fourth end, the first end being adjacent to the third end, and the second end being adjacent to the fourth end. The first sub-insulating part and the second sub-insulating part of one second side insulating part are respectively connected at the first end and the third end, and the first sub-insulating part and the second sub-insulating part of the other second side insulating part are respectively connected at the second end and the fourth end.

In the scheme, the insulating piece is simple in structure, and the periphery of the electrode assembly can be effectively coated through the plurality of first side insulating parts, the plurality of first sub-insulating parts and the plurality of second sub-insulating parts, so that a good insulating effect is achieved between the electrode assembly and the shell, the risk of lap joint of the electrode assembly and the shell is reduced, and the reliability of the battery is improved.

According to some embodiments of the present application, the electrode assembly is a square electrode assembly, and the outer perimeter of the electrode assembly includes a first side and a second side that are contiguous, the first side having an area that is greater than an area of the second side. The first side insulating part is coated on the first side surface, and the second side insulating part is coated on the second side surface.

In the above scheme, the first side insulating part is limited to be coated on the first side surface with larger area, and the second side insulating part is limited to be coated on the second side surface with smaller area, so that the size of a gap formed between the second side insulating part and the bottom insulating part is small, the size of the sealing part is correspondingly small, the material cost of the sealing part can be saved, and the control of the manufacturing cost of the battery is facilitated.

In a second aspect, some embodiments of the present application further provide a battery comprising the battery cell of any one of the first aspects.

In a third aspect, some embodiments of the present application further provide an electrical device, including a battery cell according to any one of the first aspect, where the battery cell is configured to provide electrical energy.

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

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a vehicle in some embodiments of the present application;

FIG. 2 is an exploded perspective view of a battery in some embodiments of the present application;

FIG. 3 is an exploded perspective view of a battery cell according to some embodiments of the present application;

FIG. 4 is a schematic view of an insulator of a current cell;

FIG. 5 is a schematic view of an insulator in some embodiments of the present application;

FIG. 6 is a schematic illustration of an insulator after deployment in some embodiments of the present application;

fig. 7 is a schematic view of an insulator in accordance with further embodiments of the present application.

Icon: 20-battery cells; 21-a housing; 210-end caps; 211-a housing; 22-electrode assembly; 220-bottom; 221-a first side; 222-a second side; 23-insulating member; 230-bottom insulation; 2300-first crease; 231-side insulating parts; 2310—a first side insulating portion; 23100-second fold; 23101-first sub-crease; 23102-second sub-crease; 2311-a second side insulating part; 23110-first sub-insulation; 23111-a second sub-insulation; 232-a seal; 2320-third fold; 2321-cutting an angle; 24-gap; 25-electrode terminals; 26-an adapter; 100-cell; 1000-vehicle; 200-a controller; 300-motor; 10-a box body; 11-a first tank body; 12-a second tank body.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, 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 apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

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

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

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

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

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

In the present application, the battery cell may include a lithium ion battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, etc., which is not limited in the embodiment of the present application. The battery cells may be cylindrical, flat, rectangular, or otherwise shaped, as well as the embodiments herein are not limited in this regard.

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

The battery cell includes a housing, an electrode assembly and an electrolyte, the electrode assembly being disposed inside the housing. The electrode assembly consists of a positive electrode plate, a negative electrode plate and a diaphragm. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector without the positive electrode active material layer protrudes out of the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer is used as a positive electrode lug. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector without the negative electrode active material layer protrudes out of the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer is used as a negative electrode lug. The material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon, silicon, or the like. The separator may be made of PP (polypropylene) or PE (polyethylene). The diaphragm has electronic insulation and is used for isolating adjacent positive pole pieces and negative pole pieces and preventing the adjacent positive pole pieces and negative pole pieces from being short-circuited. The diaphragm has a large number of through micropores, can ensure free passage of electrolyte ions, and has good permeability to lithium ions.

The battery also comprises an insulating part, wherein the insulating part is coated on the electrode assembly, so that the shell and the electrode assembly can be isolated in an insulating way. In some embodiments, the insulator may be an insulating film, a mylar film, or the like.

In some embodiments, the tab of the electrode assembly is positioned on the top surface of the electrode assembly, and the tab may be connected to an electrode terminal through an adapter, through which input and output of current are achieved. The insulating member may include a bottom insulating portion coated on the bottom surface of the electrode assembly and a side insulating portion coated on the outer circumference of the electrode assembly.

In the development of battery technology, how to improve the reliability of a battery is a technical problem to be solved in battery technology.

In the current battery cell, the side insulating part of the insulating member includes a first side insulating part and a second side insulating part which are circumferentially arranged in the electrode assembly, the first side insulating part is coated on a part of the peripheral wall of the electrode assembly, and the second side insulating part is coated on another part of the peripheral wall of the electrode assembly. The first side insulating part is connected with the bottom insulating part, and the second side insulating part is not connected with the bottom insulating part, so that a gap is formed between the second side insulating part and the bottom insulating part. The electrode assembly is exposed from the gap due to the existence of the gap, so that the pole piece in the electrode assembly is overlapped with the shell, the shell is electrically corroded, and the reliability of the battery is affected.

In view of this, in order to improve the problem that the electrode assembly is overlapped with the case by the gap between the second side insulating part and the bottom insulating part, resulting in low reliability of the battery, some embodiments of the present application provide a battery cell including an electrode assembly and an insulating member including a bottom insulating part covering the bottom of the electrode assembly and a side insulating part connected with the bottom insulating part and covering the outer circumference of the electrode assembly. The side insulating part includes a first side insulating part and a second side insulating part arranged along a circumferential direction of the electrode assembly, the first side insulating part being connected with the bottom insulating part with a gap therebetween. The insulating piece further comprises a sealing part, and the sealing part is connected with the bottom insulating part and seals the gap.

In the above scheme, through setting up sealing part, can seal the clearance that forms between second side insulating part and the bottom insulating part by the insulating part to reduce electrode assembly and battery cell's shell overlap joint by this clearance exposure outward, lead to the risk of shell electric corrosion, and then make the battery have higher reliability.

The battery cell disclosed by the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but is not limited to the electric devices. A power supply system having a battery cell, a battery, or the like disclosed in the present application, which constitutes the power utilization device, may be used.

The embodiment of the application provides an electricity utilization device using a battery as a power supply, wherein the electricity utilization device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiments will take an electric device according to an embodiment of the present application as an example of a vehicle.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the vehicle 1000, and the battery 100 may be provided at the bottom of the vehicle 1000, at the head of the vehicle 1000, or at the rear of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operation power source or a use power source of the vehicle 1000, or the like. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, battery 100 may not only be used as an operating power source or a utility power source for vehicle 1000, but may also be used as a drive power source for vehicle 1000 to provide drive power for vehicle 1000 instead of or in part instead of fuel oil or natural gas.

Referring to fig. 2, fig. 2 is an exploded perspective view of a battery 100 according to some embodiments of the present application, where the battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is configured to be accommodated in the case 10.

The case 10 is used to provide an assembly space for the battery cells 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first case body 11 and a second case body 12, the first case body 11 and the second case body 12 being covered with each other, the first case body 11 and the second case body 12 together defining an assembly space for accommodating the battery cell 20. The second box body 12 may have a hollow structure with one end opened, the first box body 11 may have a plate-shaped structure, and the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 define an assembly space together; the first tank body 11 and the second tank body 12 may each have a hollow structure with one side opened, and the open side of the first tank body 11 may be closed to the open side of the second tank body 12.

Of course, the case 10 formed by the first case body 11 and the second case body 12 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or a square, etc. Illustratively, in fig. 2, the case 10 is rectangular in shape.

In the battery 100, the number of battery cells 20 provided in the case 10 may be one or more. When the number of the battery cells 20 disposed in the case 10 is plural, the plurality of battery cells 20 may be connected in series or parallel or a series-parallel connection, and the series-parallel connection means that the plurality of battery cells 20 are connected in series or parallel. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series or parallel or series-parallel connection, and a plurality of battery modules are connected in series or parallel or series-parallel connection to form a whole and are integrally accommodated in the case 10.

In some embodiments, the battery 100 may further include other structures, for example, the battery 100 may further include a bus member for connecting the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20.

Wherein each battery cell 20 may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 20 may be in the shape of a cylinder, prism, or other shape, etc.

Referring to fig. 3-6, fig. 3 is an exploded perspective view of the battery cell 20 in some embodiments of the present application, fig. 4 is a schematic view of an insulating member of a current battery cell, fig. 5 is a schematic view of an insulating member 23 in some embodiments of the present application, and fig. 6 is a schematic view of the insulating member 23 after being unfolded in some embodiments of the present application.

The battery cell 20 includes an electrode assembly 22 and an insulating member 23, the insulating member 23 includes a bottom insulating part 230 and a side insulating part 231, the bottom insulating part 230 covers the bottom 220 of the electrode assembly 22, and the side insulating part 231 is connected with the bottom insulating part 230 and covers the outer circumference of the electrode assembly 22. The side insulating part 231 includes first and second side insulating parts 2310 and 2311 arranged along the circumferential direction of the electrode assembly 22, the first side insulating part 2310 being connected to the bottom insulating part 230, and the second side insulating part 2311 having a gap 24 therebetween. Wherein the insulator 23 further comprises a sealing portion 232, the sealing portion 232 is connected with the bottom insulator 230 and closes the gap 24.

The battery cell 20 includes a case 21, the case 21 accommodating the electrode assembly 22, and the case 21 may also be used to accommodate an electrolyte, such as an electrolyte solution. Referring to fig. 3, in some embodiments, housing 21 includes a housing 211 and an end cap 210. The case 211 is formed at the inside thereof with a receiving cavity for receiving the electrode assembly 22, the case 211 has an opening communicating with the receiving cavity, and the cap 210 is capped at the opening of the case 211 and forms a sealing connection to form a sealing space for receiving the electrode assembly 22 and the electrolyte. The housing 211 includes a peripheral wall and a bottom wall, and the peripheral wall is enclosed at the edge of the bottom wall to form a containing cavity together with the bottom wall.

In some embodiments, the material of the housing 21 may be metal or a combination of metal and nonmetal, for example, the housing 21 may be made of metal, such as aluminum, copper, iron, steel, or aluminum alloy.

The shape of the case 21 may be determined according to the specific shape of the electrode assembly 22. For example, the electrode assembly 22 is a square electrode assembly 22, and a square case 21 may be used.

The electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20. The structure of the electrode assembly 22 may be various, and the electrode assembly 22 may be a wound structure formed by winding a pole piece, a separator, and the main body of the electrode assembly 22 may have a cylindrical shape, by way of example. The main body of the electrode assembly 22 may also be square. The pole pieces comprise a first pole piece and a second pole piece which are opposite in polarity, and the first pole piece and the second pole piece can be isolated through a diaphragm. The main material of the diaphragm can be at least one selected from glass fiber, non-woven fabrics, polyethylene, polypropylene and polyvinylidene fluoride. The tabs of the electrode assembly 22 may include first and second tabs having opposite polarities. In some embodiments, the tabs of the electrode assembly 22 may be connected with the electrode terminals 25 through the adapters 26 to achieve output or input of current.

The insulating member 23 is a member for coating the outer surface of the electrode assembly 22. The insulating member 23 may be made of a material having insulating properties, such as polyethylene, polypropylene, polyethylene terephthalate, or the like. In some embodiments, the insulator 23 may be an insulating film, which is thin in thickness. In some embodiments, the insulating member 23 is coated on the outer surface of the electrode assembly 22, and an adhesive layer or an adhesive may be provided between the insulating member 23 and the electrode assembly 22.

The insulating member 23 includes a bottom insulating portion 230 and a side insulating portion 231, the bottom insulating portion 230 for covering the bottom 220 of the electrode assembly 22, for insulating the bottom wall of the case 21 from the electrode assembly 22. The side insulating part 231 is used to cover the outer circumference of the electrode assembly 22 and to insulate the electrode assembly 22 from the inner surface of the sidewall of the case 21.

Referring to fig. 3 and 5, the side insulating part 231 includes a first side insulating part 2310 and a second side insulating part 2311 arranged along the circumferential direction of the electrode assembly 22, the first side insulating part 2310 is connected to the bottom insulating part 230, and a gap 24 is provided between the second side insulating part 2311 and the bottom insulating part 230. The first side insulating part 2310 and the second side insulating part 2311 may be used to cover different portions of the outer circumference of the electrode assembly 22, for example, the electrode assembly 22 is square, the outer circumference thereof is formed of a plurality of sides, the plurality of sides may include two first sides 221 disposed opposite to each other and two second sides 222 disposed opposite to each other, the first side insulating part 2310 may cover the first sides 221, and the second side insulating part 2311 may cover the second sides 222.

The "first side insulating portion 2310 is connected to the bottom insulating portion 230" is understood to mean that the first side insulating portion 2310 is connected to the bottom insulating portion 230 without forming the gap 24 therebetween. By "having a gap 24 between the second side insulating part 2311 and the bottom insulating part 230" it is understood that a gap 24 is formed between the second side insulating part 2311 and the bottom insulating part 230, and the gap 24 may expose the electrode assembly 22 to the outside, for example, the electrode assembly 22 is exposed by the gap 24 to be in contact with the case 21. For example, please refer to fig. 4, in which the position of the gap 24 is shown in fig. 4.

The seal portion 232 is connected to the bottom insulating portion 230 in a partial structure of the insulator 23, and can close the gap 24 formed between the second side insulating portion 2311 and the bottom insulating portion 230.

For example, referring to fig. 4-6, the insulating member 23 may be wrapped around the electrode assembly 22 by folding, referring to fig. 6, the insulating member 23 is unfolded to be flat, the insulating member 23 includes a bottom insulating portion 230 corresponding to the bottom 220 of the electrode assembly 22, a first side insulating portion 2310 corresponding to the first side 221 of the electrode assembly 22, and a second side insulating portion 2311 corresponding to the second side 222 of the electrode assembly 22. The bottom insulating portion 230 and the first side insulating portion 2310 are connected to each other with a first fold 2300 between the bottom insulating portion 230 and the first side insulating portion 2310, and the first side insulating portion 2310 may be folded toward the first side 221 based on the first fold 2300 and coated on the first side 221. The first side insulating portion 2310 and the second side insulating portion 2311 are connected to each other, and a second fold 23100 is formed between the first side insulating portion 2310 and the second side insulating portion 2311, and the second side insulating portion 2311 may be folded toward the second side surface 222 based on the second fold 23100 and cover the second side surface 222. Since the second side insulating part 2311 is not connected to the bottom insulating part 230, a gap 24 is formed between the second side insulating part 2311 and the bottom insulating part 230 when the insulating member 23 is coated on the electrode assembly 22.

Referring to fig. 6, the insulating member 23 further includes a sealing portion 232, the sealing portion 232 is connected to the bottom insulating portion 230, and a third crease 2320 is formed between the sealing portion 232 and the bottom insulating portion 230, so that the sealing portion 232 can be folded towards the second side 222 based on the third crease 2320 and cover the second side 222 and simultaneously close the gap 24.

In the above-described aspects, by providing the sealing part 232, the gap 24 formed between the second side insulating part 2311 of the insulating member 23 and the bottom insulating part 230 can be closed, thereby reducing the risk of the electrode assembly 22 being exposed to the outside through the gap 24 to overlap the case 21 of the battery cell 20, resulting in the galvanic corrosion of the case 21, and thus, the battery having high reliability.

Referring to fig. 5 and 6, an end of the sealing portion 232 remote from the bottom insulating portion 230 is provided with a chamfer 2321 according to some embodiments of the present application.

The end of the sealing part 232 away from the bottom insulating part 230 may refer to the free end of the sealing part 232, for example, the sealing part 232 may be folded along the third fold 2320 toward the second side 222, and the end away from the bottom 220 of the electrode assembly 22 is the free end of the sealing part 232. In some embodiments, in the process of turning over the sealing part 232, the direction of the turning force is inaccurate, so that the sealing part 232 is deviated to the first side 221, and a part of the sealing part 232 is overlapped with the first side insulating part 2310 on the first side 221, so that after the insulating part is covered on the electrode assembly 22, a convex hull is formed at the part overlapped with the sealing part 232, and the assembly of the electrode assembly 22 in the case 21 is affected.

In some embodiments, the sealing portion 232 may be square, and the end far from the bottom insulating portion 230 has a corner, which has a high risk of being stacked on the first side 221, so that by cutting off the corner, that is, providing the sealing portion 232 with a chamfer 2321 at the end far from the bottom insulating portion 230, the risk of a portion of the sealing portion 232 being stacked on the first side 221 can be reduced. Wherein the number of corners of the end of the sealing part 232 remote from the bottom insulating part 230 is two, one of which corresponds to one of the first sides 221 of the electrode assembly 22 and the other of which corresponds to the other of the first sides 221 of the electrode assembly 22, in some embodiments, one of the corners of the sealing part 232 may be cut off to form one cut angle 2321, and both of the corners of the sealing part 232 may be cut off to form two cut angles 2321.

In the above-mentioned scheme, through setting up chamfer 2321 in the one end that sealing portion 232 kept away from bottom insulation portion 230, can reduce sealing portion 232 when closing clearance 24, because of the uneven or atress misdirection leads to sealing portion 232 to keep away from one end of bottom insulation portion 230 to first side insulation portion 2310 skew, lead to with first side insulation portion 2310 range upon range of and influence the risk of insulating member 23 to electrode assembly 22's cladding effect for battery cell 20 has good cladding quality, improves the reliability of battery.

Referring to fig. 5 and 7, fig. 7 is a schematic view of an insulator 23 according to other embodiments of the present application. The chamfer 2321 includes a square chamfer or a triangular chamfer.

Referring to fig. 5, chamfer 2321 comprises a square chamfer. When the chamfer 2321 is not provided, the outer contour of the sealing portion 232 may be square, the corner of the sealing portion 232 far away from the bottom insulator 23 is cut, and the cut portion is square, so that a square chamfer can be formed at one end of the sealing portion 232 far away from the bottom insulator 23.

Referring to fig. 6, chamfer 2321 comprises a triangular chamfer. When the chamfer 2321 is not provided, the outer contour of the sealing portion 232 may be square, the corner of the sealing portion 232 far away from the bottom insulator 23 is cut, and the cut portion is triangular, so that a triangular chamfer can be formed at one end of the sealing portion 232 far away from the bottom insulator 23.

In the above-mentioned scheme, through limiting chamfer 2321 to square chamfer or triangle-shaped chamfer, can reduce effectively that sealing portion 232 and first side insulating portion 2310 overlap joint influence the risk of cladding effect, improve the cladding quality of battery monomer 20, and then make the improvement battery have higher reliability.

According to some embodiments of the present application, please refer to fig. 5 and 6, the number of the first side insulating portions 2310 is two, and the two first side insulating portions 2310 are opposite and spaced apart. The second side insulating portion 2311 includes a first sub insulating portion 23110 and a second sub insulating portion 23111, the first sub insulating portion 23110 is connected to one of the two first side insulating portions 2310, the second sub insulating portion 23111 is connected to the other of the two first side insulating portions 2310, the first sub insulating portion 23110 is connected to the second sub insulating portion 23111, and gaps 24 are provided between the first sub insulating portion 23110 and the bottom insulating portion 230, and between the second sub insulating portion 23111 and the bottom insulating portion 230.

In some embodiments, electrode assembly 22 has two opposing first sides 221. The two first sides 221 are respectively covered by the corresponding first side insulating portions 2310 to be respectively insulated from the housing 21. Referring to fig. 6, two first side insulating parts 2310 are located at both sides of the bottom insulating part 230 and are connected with the bottom insulating part 230, respectively.

Referring to fig. 5, one second side 222 of the electrode assembly 22 may be commonly covered by the first and second sub-insulation portions 23110 and 23111. The first sub-insulating portion 23110 can be connected to one of the two first side insulating portions 2310, and the other of the two first side insulating portions 2310 is connected to the second sub-insulating portion 23111. The connection relationship between the first side insulating portion 2310 and the first sub insulating portion 23110 includes, but is not limited to, bonding or welding, or the first side insulating portion 2310 is integrally formed with the first sub insulating portion 23110. The connection relationship between the first side insulating portion 2310 and the second sub insulating portion 23111 includes, but is not limited to, bonding or welding, or the first side insulating portion 2310 is integrally formed with the second sub insulating portion 23111.

The second crease 23100 includes a first sub-crease 23101 and a second sub-crease 23102, the first sub-insulating portion 23110 is connected to one of the first side insulating portions 2310 with the first sub-crease 23101 formed therebetween, and the first sub-insulating portion 23110 is folded along the first sub-crease 23101 toward the second side surface 222. The second sub-insulating portion 23111 is connected to the other first side insulating portion 2310 with a second sub-fold 23102 formed therebetween, and the second sub-insulating portion 23111 is folded along the second sub-fold 23102 toward the second side 222.

In some embodiments, the first and second sub-insulation portions 23110 and 23111 can overlap each other to collectively cover the second side 222. The first sub-insulating portion 23110 can be closer to the second side 222 than the second sub-insulating portion 23111, or the second sub-insulating portion 23111 can be closer to the second side 222 than the first sub-insulating portion 23110.

In other embodiments, the edges of the first and second sub-insulation portions 23110 and 23111 facing each other may be connected to each other to jointly cover the second side 222.

In some embodiments, the first and second sub-insulation portions 23110 and 23111 can be connected to each other, and the connection relationship of the first and second sub-insulation portions 23110 and 23111 includes, but is not limited to, welding and bonding.

In the above-described embodiment, by providing two first side insulating portions 2310, the peripheral wall of the electrode assembly 22 can be effectively covered, and the insulating effect of the electrode assembly 22 and the case 21 of the battery cell 20 can be improved. Meanwhile, the second side insulating part 2311 is provided to include the first and second sub insulating parts 23110 and 23111, so that the first and second sub insulating parts 23110 and 23111 cover the circumferential wall of the electrode assembly 22 in a lap joint or interconnection manner, thereby reducing difficulty in covering the electrode assembly 22 by the insulating member 23 and improving manufacturing efficiency of the battery.

According to some embodiments of the present application, referring to fig. 5, the sealing portions 232 are located outside the first and second sub-insulation portions 23110 and 23111.

The "sealing parts 232 are located outside the first and second sub-insulating parts 23110 and 23111" can be understood that the sealing parts 232 are portions of the insulating member 23 located at the outermost side of the electrode assembly 22. In some embodiments, the first sub-insulator 23 and the second sub-insulator 23 may be folded over the second side 222, and the sealing portion 232 may be turned over the second side 222.

In other embodiments, the first and second sub-insulation portions 23110 and 23111 overlap each other, and the sealing portion 232 is positioned between the first and second sub-insulation portions 23110 and 23111.

The "the first and second sub-insulating portions 23110 and 23111 overlap each other, and the sealing portion 232 is located between the first and second sub-insulating portions 23110 and 23111" may be understood as that the sealing portion 232 is located between the first and second sub-insulating portions 23110 and 23111. In some embodiments, the first sub-insulating portion 23110 can be folded along the first sub-crease 23101 onto the second side 222, the sealing portion 232 can be folded along the third crease 2320 onto the second side 222, and the second sub-insulating portion 23111 can be folded along the second sub-crease 23102 onto the second side 222.

In another embodiment, the sealing portions 232 are located inside the first and second sub-insulation portions 23110 and 23111.

The "sealing parts 232 are located inside the first and second sub-insulating parts 23110 and 23111" may be understood that the sealing parts 232 are portions of the insulating member 23 that are in contact with the second side 222 of the electrode assembly 22. In some embodiments, the sealing portion 232 may be folded along the third fold 2320 onto the second side 222, and then the first sub-insulator 23 and the second sub-insulator 23 are folded onto the second side 222.

In the above-mentioned scheme, the diversity of the setting positions of the sealing part 232 can be set on the outer sides of the first sub-insulating part 23110 and the second sub-insulating part 23111, or on the inner sides of the first sub-insulating part 23110 and the second sub-insulating part 23111, or between the first sub-insulating part 23110 and the second sub-insulating part 23111, so as to provide various choices for the assembly process of the insulating part 23 coated on the electrode assembly 22, so as to adapt to different requirements.

According to some embodiments of the present application, referring to fig. 5 and 6, the number of the second side insulating parts 2311 is two, and the first side insulating parts 2310 and the second side insulating parts 2311 are alternately arranged in the circumferential direction of the electrode assembly 22. The number of the sealing portions 232 is two, and the two sealing portions 232 close the gaps 24 between the two second side insulating portions 2311 and the bottom insulating portion 230, respectively.

In some embodiments, the electrode assembly 22 may be a square electrode assembly 22, the circumferential wall of which has four wall surfaces disposed adjacently, for example, two first side surfaces 221 and second side surfaces 222, and the first side surfaces 221 and the second side surfaces 222 are alternately arranged along the circumferential direction of the electrode assembly 22. The first side 221 is covered by the first side insulating portion 2310, and the second side 222 is covered by the second side insulating portion 2311. The electrode assembly 22 has two opposing second sides 222. The two second side surfaces 222 are respectively covered by the corresponding second side insulating portions 2311 to be respectively insulated from the housing 21. Referring to fig. 6, the two second side insulating parts 2311 are not connected with the bottom insulating part 230.

The number of the sealing parts 232 is two, and the two sealing parts 232 are positioned at both ends of the bottom insulating part 230 and are connected with the bottom insulating part 230, respectively.

In the above-described aspect, by providing two second side insulating portions 2311 in cooperation with two second side insulating portions 2311, the outer circumference of the electrode assembly 22 can be effectively covered, so that a good insulating effect is provided between the electrode assembly 22 and the case 21. Meanwhile, by providing the two sealing parts 232 to be able to effectively close the two gaps 24 formed between the two second side insulating parts 2311 and the bottom insulating part 230, the electrode assembly 22 is exposed to the outside through the gaps 24 to overlap the case 21 of the battery cell 20, resulting in a risk of galvanic corrosion of the case 21, thereby enabling the battery to have high reliability.

In accordance with some embodiments of the present application, referring to fig. 5 and 6, in the circumferential direction of the electrode assembly 22, one of the first side insulating parts 2310 has a first end and a second end, and the other first side insulating part 2310 has a third end and a fourth end, the first end being adjacent to the third end, and the second end being adjacent to the fourth end. The first and second sub-insulating portions 23110 and 23111 of one of the second side insulating portions 2311 are connected to the first and third ends, respectively, and the first and second sub-insulating portions 23110 and 23111 of the other second side insulating portion 2311 are connected to the second and fourth ends, respectively.

The first end and the second end are two ends of one of the first side insulating portions 2310 disposed opposite to each other, and the third end and the fourth end are two ends of the other first side insulating portion 2310 disposed opposite to each other. Referring to fig. 5 and 6, the first end and the third end are on the same side, the first end corresponds to an edge between one of the second sides 222 and one of the first sides 221, and the third end corresponds to an edge between the one of the second sides 222 and the other of the first sides 221. The second end and the fourth end are on the same side, the second end corresponding to the edge between the further second side 222 and one of the first sides 221, the fourth end corresponding to the edge between the further second side 222 and the further first side 221.

"the first sub-insulating portion 23110 and the second sub-insulating portion 23111 of one of the second side insulating portions 2311 are connected at the first end and the third end, respectively" is understood as that the first sub-insulating portion 23110 of one of the second side insulating portions 2311 is connected to the first end and the second sub-insulating portion 23111 is connected to the third end to jointly cover the same second side surface 222.

The "the first and second sub-insulating portions 23110 and 23111 of the other second side insulating portion 2311 are connected at the second and fourth ends, respectively" is understood to mean that the first sub-insulating portion 23110 of the other second side insulating portion 2311 is connected to the second end and the second sub-insulating portion 23111 is connected to the fourth end so as to cover the same second side surface 222 together.

In the above scheme, the insulating member 23 has a simple structure, and can effectively cover the outer circumference of the electrode assembly 22 through the plurality of first side insulating parts 2310, the plurality of first sub insulating parts 23110 and the plurality of second sub insulating parts 23111, so that a good insulating effect is provided between the electrode assembly 22 and the case 21, the risk of overlapping the electrode assembly 22 and the case 21 is reduced, and the reliability of the battery is improved.

In accordance with some embodiments of the present application, referring to fig. 3 and 5, the electrode assembly 22 is a square electrode assembly 22, and the outer circumference of the electrode assembly 22 includes a first side 221 and a second side 222 adjacent to each other, and the area of the first side 221 is larger than the area of the second side 222. The first side insulating portion 2310 is coated on the first side 221, and the second side insulating portion 2311 is coated on the second side 222.

In some embodiments, the first side 221 may be a large face of the electrode assembly 22, i.e., a face of larger area. The second side 222 may be adjacent to a portion of the outer circumference of the electrode assembly 22 of the first side 221.

In the above-mentioned aspect, the first side insulating portion 2310 is defined to cover the first side 221 with a larger area, and the second side insulating portion 2311 is defined to cover the second side 222 with a smaller area, so that the size of the gap 24 formed between the second side insulating portion 2311 and the bottom insulating portion 230 can be made small, the size of the sealing portion 232 is correspondingly small, the material cost of the sealing portion 232 can be saved, and further the control of the manufacturing cost of the battery can be facilitated.

There is also provided, in accordance with some embodiments of the present application, a battery including the battery cell 20 described above.

There is also provided, in accordance with some embodiments of the present application, an electrical device including the battery cell 20 described above, the battery cell 20 being configured to provide electrical energy.

According to some embodiments of the present application, a battery cell 20 is provided, please refer to fig. 3-7.

The battery cell 20 includes a case 21, an electrode assembly 22, and an insulating member 23. The electrode assembly 22 may be a square electrode assembly 22. The electrode assembly 22 includes a first side 221 and a second side 222, and the first side 221 has a large area.

The insulating member 23 includes a bottom insulating part 230, a side insulating part 231, and a sealing part 232, the bottom insulating part 230 covering the bottom 220 of the electrode assembly 22, and the side insulating part 231 covering the first side 221 and the second side 222 of the electrode assembly 22. The side insulating part 231 includes a first side insulating part 2310 and a second side insulating part 2311 arranged along the circumferential direction of the electrode assembly 22, and the first side insulating part 2310 is connected to the bottom insulating part 230 and serves to cover the first side 221. The number of the first side insulating portions 2310 is two, and the two first side insulating portions 2310 respectively cover the two first side surfaces 221 disposed opposite to each other. The second side insulating portion 2311 is used to cover the second side surface 222, and a gap 24 is formed between the second side insulating portion 2311 and the bottom insulating portion 230.

The second side insulating portion 2311 includes a first sub insulating portion 23110 and a second sub insulating portion 23111, the first sub insulating portion 23110 is connected to one of the two first side insulating portions 2310, and the second sub insulating portion 23111 is connected to the other of the two first side insulating portions 2310. The first and second sub-insulation portions 23110 and 23111 overlap.

The sealing part 232 is connected with the bottom insulating part 230 and closes the gap 24 to reduce the risk of the electrode assembly 22 being exposed to the outside through the gap 24 to overlap the case 21 of the battery cell 20, resulting in the galvanic corrosion of the case 21, thereby enabling the battery to have high reliability.

Wherein in some embodiments, the sealing portions 232 are located outside the first and second sub-insulating portions 23110 and 23111. In other embodiments, the sealing portion 232 is located between the first sub-insulating portion 23110 and the second sub-insulating portion 23111. In other embodiments, the sealing portion 232 is located inside both the first sub-insulating portion 23110 and the second sub-insulating portion 23111.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (10)

1. A battery cell, comprising:

an electrode assembly;

an insulating member including a bottom insulating part covering the bottom of the electrode assembly and a side insulating part connected to the bottom insulating part and covering the outer circumference of the electrode assembly; the side insulating part includes a first side insulating part and a second side insulating part arranged along a circumferential direction of the electrode assembly, the first side insulating part being connected with the bottom insulating part with a gap therebetween;

Wherein the insulator further includes a sealing portion connected with the bottom insulating portion and closing the gap.

2. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

and one end of the sealing part, which is far away from the bottom insulation part, is provided with a chamfer.

3. The battery cell of claim 2, wherein the battery cell comprises a plurality of cells,

the chamfer comprises a square chamfer or a triangular chamfer.

4. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

the number of the first side insulating parts is two, and the two first side insulating parts are opposite and are arranged at intervals; the second side insulating part comprises a first sub insulating part and a second sub insulating part, the first sub insulating part is connected with one of the two first side insulating parts, the second sub insulating part is connected with the other of the two first side insulating parts, the first sub insulating part is connected with the second sub insulating part, and gaps are reserved between the first sub insulating part and the bottom insulating part and between the second sub insulating part and the bottom insulating part.

5. The battery cell of claim 4, wherein the battery cell comprises a plurality of cells,

the sealing parts are positioned outside the first sub-insulating part and the second sub-insulating part;

Or, the first sub-insulating part and the second sub-insulating part overlap each other, and the sealing part is located between the first sub-insulating part and the second sub-insulating part;

or, the sealing portions are located inside the first and second sub-insulating portions.

6. The battery cell according to claim 4 or 5, wherein,

the number of the second side insulating parts is two, and the first side insulating parts and the second side insulating parts are alternately arranged along the circumferential direction of the electrode assembly; the number of the sealing parts is two, and the two sealing parts respectively seal gaps between the two second side insulating parts and the bottom insulating parts.

7. The battery cell of claim 6, wherein the battery cell comprises a plurality of cells,

one of the first side insulating parts has a first end and a second end, and the other of the first side insulating parts has a third end and a fourth end, adjacent to the third end, adjacent to the second end, in the circumferential direction of the electrode assembly;

the first and second sub-insulating portions of one of the second side insulating portions are connected to the first and third ends, respectively, and the first and second sub-insulating portions of the other of the second side insulating portions are connected to the second and fourth ends, respectively.

8. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells,

the electrode assembly is a square electrode assembly, and the periphery of the electrode assembly comprises a first side surface and a second side surface which are adjacent, wherein the area of the first side surface is larger than that of the second side surface; the first side insulating part is coated on the first side surface, and the second side insulating part is coated on the second side surface.

9. A battery comprising a cell according to any one of claims 1-8.

10. An electrical device comprising a cell according to any one of claims 1-8 for providing electrical energy.