Battery cell, battery, and electric device

Abstract

A battery monomer (20), a battery (100) and an electric device, the battery monomer (20) comprises: a shell (21) with an opening (211); an end cover assembly (23) for closing the opening (211), the end cover assembly (23) comprising an electrode terminal (232); the shell (21) is further provided with an electrode assembly (22), an adapter (24) and an insulating piece (25), the electrode assembly (22) comprising a tab (221), the adapter (24) is used for electrically connecting the tab (221) and the electrode terminal (232), and the insulating piece (25) is used for insulating the adapter (24) from the shell (21). The provided battery monomer (20), battery (100) and electric device can alleviate the problem of thermal failure of the battery monomer (20) caused by heat diffusion during use of the battery monomer (20), and improve the safety performance of the battery monomer (20) and the battery (100) applied thereto.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery, in particular to a battery monomer, a battery and an electric device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] The existing battery, when the battery monomer occurs thermal diffusion, there is an electrical contact risk between the adapter for electrically connecting the tab and the electrode terminal and the shell, which leads to thermal failure of the battery monomer and reduces the safety performance of the battery monomer and the battery applied thereto. SUMMARY

[0004] In view of the above problems, the present application provides a battery monomer, a battery and an electric device, which can alleviate the problem of thermal failure of the battery monomer caused by thermal diffusion during use of the battery monomer, and improve the safety performance of the battery monomer and the battery applied thereto.

[0005] In a first aspect, the present application provides a battery monomer, comprising: a shell having an opening; an electrode assembly arranged in the shell, the electrode assembly comprising a tab; a cover assembly arranged to close the opening, the cover assembly comprising an electrode terminal; an adapter arranged in the shell and used to electrically connect the tab and the electrode terminal; and an insulating member arranged in the shell, the insulating member being used to insulate the adapter from the shell.

[0006] In the technical solution of the present application, the battery monomer comprises a shell, an electrode assembly, a cover assembly, an adapter and an insulating member. The electrode assembly is arranged in the shell, and the cover assembly can close the opening of the shell. The adapter is used to electrically connect the tab of the electrode assembly and the electrode terminal. Since the insulating member is arranged in the shell and is used to insulate the adapter from the shell, even if the adapter moves to the side of the shell when the battery is out of control and the electrode assembly in the battery monomer expands and deforms, the insulating member can prevent the adapter from being in electrical contact with the shell, thereby effectively improving the safety performance of the battery monomer and the battery applied thereto.

[0007] In some embodiments, the shell forms an opening in a first direction, the electrode assembly is provided with a tab at both ends in a second direction, and along a third direction, the width dimension of the insulating member is smaller than the width dimension of the adapter, and the first direction, the second direction and the third direction are arranged to intersect each other.

[0008] The battery monomer provided by the embodiment of the present application ensures that the insulating piece can avoid interference with other insulating film layers during assembly by making the width dimension of the insulating piece along the third direction smaller than the width dimension of the adapter piece after the insulating piece is installed between the adapter piece and the shell.

[0009] In some embodiments, the normal projection of the insulating piece on the adapter piece forms a spacing T with the edge of the adapter piece in the third direction, and the spacing T has a value ranging from 0.5 mm to 1 mm.

[0010] The battery monomer provided by the embodiment of the present application ensures that the insulating piece can avoid interference with other insulating film layers during assembly by making the width dimension of the insulating piece along the third direction smaller than the width dimension of the adapter piece after the insulating piece is installed between the adapter piece and the shell.

[0011] In some embodiments, the thickness of the insulating piece is less than or equal to 0.5 mm.

[0012] The battery monomer provided by the embodiment of the present application ensures that the insulating piece can avoid interference with other insulating film layers during assembly by making the width dimension of the insulating piece along the third direction smaller than the width dimension of the adapter piece after the insulating piece is installed between the adapter piece and the shell.

[0013] In some embodiments, the adapter piece has opposite first and second end portions, the first end portion is connected with the electrode terminal, the second end portion extends away from the end cover assembly and beyond the tab, and the insulating piece covers the second end portion along the second direction.

[0014] Since the electrode assembly will swell and deform when the battery monomer undergoes thermal diffusion, resulting in an increase in volume, the side where the second end portion of the insulating piece is located cooperates with the tab, and the side where the first end portion is located is connected with the electrode terminal. When the electrode assembly swells and deforms, it will cause the part connected with the adapter piece to deform. That is, the second end portion first warps toward the side where the shell is located. The battery monomer provided by the embodiment of the present application makes the insulating piece cover the second end portion, so that the insulating piece can insulate the second end portion from the shell when the battery monomer undergoes thermal diffusion, thereby ensuring the safety performance of the battery monomer.

[0015] In some embodiments, the insulating piece is stacked with the tab and connected with the tab and the second end portion.

[0016] In some embodiments, the second end portion is bent toward the side where the side wall of the shell is located along the second direction and forms a stepped surface, and the stepped surface is used to support the insulating piece.

[0017] In some embodiments, the insulating piece is connected with the shell.

[0018] In some embodiments, the battery cell further comprises a protective film, the protective film is configured to insulate the electrode assembly from the shell, and an insulating piece is configured between the protective film and the shell and connected with one of the protective film and the shell.

[0019] In some embodiments, the insulating piece is connected to a surface of the protective film away from the adapter tab.

[0020] In some embodiments, the protective film comprises a bottom surface, a first side wall surface and a second side wall surface which are configured to intersect with each other, the area of the first side wall surface is greater than the area of the second side wall surface, the second side wall surface faces the tab and the adapter tab, and the insulating piece is configured on the second side wall surface and matches the shape of the second side wall surface.

[0021] In some embodiments, the melting point of the insulating piece is greater than or equal to the melting point of the protective film.

[0022] In some embodiments, the strength of the insulating piece is greater than or equal to the strength of the protective film.

[0023] In some embodiments, the insulating piece is adhesively connected with one of the protective film and the shell.

[0024] In a second aspect, the present application provides a battery comprising the battery cell described above.

[0025] In a third aspect, the present application provides a power consuming device comprising the battery described above.

[0026] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the following detailed description of the preferred embodiments can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following detailed description of the preferred embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in the accompanying drawings indicate the same or similar components. In the drawings:

[0028] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0029] Figure 2 is a structural schematic diagram of a battery provided by an embodiment of the present application;

[0030] Figure 3 is an exploded structural schematic diagram of a battery cell provided by an embodiment of the present application;

[0031] Figure 4 is a side view of a partial structure of a battery cell according to an embodiment of the present application;

[0032] Figure 5 is a partial cross-sectional view of a battery cell according to an embodiment of the present application;

[0033] Figure 6 is Figure 5 is an enlarged view of A in FIG. 1;

[0034] Figure 7 is a partial cross-sectional view of a battery cell according to another embodiment of the present application;

[0035] Figure 8 is Figure 7 is an enlarged view of B in FIG. 2;

[0036] Figure 9 is a schematic view of a fitting of an insulating member and a case according to an embodiment of the present application;

[0037] Figure 10 is a schematic view of an exploded structure of a battery cell according to still another embodiment of the present application;

[0038] Figure 11 is a partial cross-sectional view of a battery cell according to still another embodiment of the present application;

[0039] Figure 12 is Figure 11 is an enlarged view of C in FIG. 3;

[0040] Figure 13 is a schematic view of an open state of a protective film according to an embodiment of the present application;

[0041] Figure 14 is a schematic view of a folded state of a protective film according to an embodiment of the present application.

[0042] Reference Signs in the Detailed Description of the Invention:

[0043] 1000 - vehicle

[0044] 100 - battery; 200 - controller; 300 - motor

[0045] 10 - case; 11 - first portion; 12 - second portion; 13 - accommodation space

[0046] 20 - battery cell

[0047] 21 - case; 211 - opening

[0048] 22 - electrode assembly; 221 - tab

[0049] 23 - end cap assembly; 231 - end cap; 232 - electrode terminal

[0050] 24-adapter; 241-first connecting piece; 242-second connecting piece; 24a-first end portion; 24b-second end portion; 2421-first surface; 2422-second surface; 2423-transition surface;

[0051] 25-insulating member;

[0052] 26-protective film; 261-first side wall surface; 262-second side wall surface; 263-bottom wall;

[0053] X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0054] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0055] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0056] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0057] In addition, the technical terms "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0058] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the technical terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0059] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0060] At present, from the development of market situation, the application of power battery is more and more widely. The power battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0061] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery monomers to provide higher voltage and capacity. For example, the battery mentioned in the present application can include a battery module or a battery pack, etc. The battery generally includes a box for packaging one or more battery monomers. The box can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery monomer.

[0062] The battery monomer includes a shell, an electrode assembly, a top cover assembly and an adapter for electrically connecting the tab of the electrode assembly and the electrode terminal on the top cover assembly.

[0063] The inventor of the present application notices that when the battery monomer occurs thermal diffusion, the high temperature will cause the original insulation structure inside the battery monomer to melt and fail, and the whole electrode assembly will expand and move to the inner wall of the shell, which will cause the adapter for electrically connecting the tab of the battery monomer and the electrode terminal on the top cover assembly to lap with the shell and form a loop, thereby causing the electrode assembly to be short-circuited, causing the battery monomer to be thermally failed, and bringing safety hazards to the battery monomer and the battery applied thereto.

[0064] In order to alleviate the problem of thermal failure of the battery monomer, the applicant found that by additionally adding an insulating part, even if the battery monomer has thermal diffusion and the existing insulation structure inside the battery monomer melts and fails, the newly added insulation part can insulate the two parts, avoiding the lap joint of the adapter and the shell and forming a loop.

[0065] Based on the above considerations, in order to solve the problem of thermal failure of the battery monomer, the inventor has designed a battery monomer. The battery monomer includes a shell, an electrode assembly, an end cover assembly, an adapter, and an insulating part. The shell has an opening. The electrode assembly is arranged in the shell and includes a tab. The end cover assembly closes the opening and includes an electrode terminal. The adapter is arranged in the shell and is used to electrically connect the tab and the electrode terminal. The insulating part is arranged in the shell and is used to insulate the adapter from the shell.

[0066] In such a battery monomer, since the insulating part is arranged in the shell and is used to insulate the adapter from the shell, when the battery has thermal runaway and the electrode assembly in the battery monomer expands and deforms, even if the adapter moves to the side where the shell is located, the insulating part can prevent the adapter from electrically contacting the shell, thereby effectively improving the safety performance of the battery monomer and the battery applied thereto.

[0067] The technical solutions described in the embodiments of the present application are applicable to batteries and electric devices using batteries.

[0068] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not specially limit the above electric devices.

[0069] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above described batteries and electric devices, but can also be applied to all batteries including a box body and electric devices using batteries. However, for the sake of simplicity, the following embodiments are described by taking an electric vehicle as an example.

[0070] Please refer to Figure 1 , Figure 1A structural schematic diagram of a vehicle 1000 is provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0071] In some embodiments of the present application, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0072] Please refer to Figure 2 and Figure 3 The battery 100 includes a box body 10 and a battery monomer 20, and the battery monomer 20 is contained in the box body 10. The box body 10 is used to provide a containing space for the battery monomer 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, the first part 11 and the second part 12 are mutually covered, and the first part 11 and the second part 12 jointly define a containing space 13 for containing the battery monomer 20. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-shaped structure, the first part 11 being covered on the open side of the second part 12 to jointly define the containing space 13 with the second part 12. The first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 is covered on the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0073] In the battery 100, the battery monomer 20 can be multiple, and the multiple battery monomers 20 can be connected in series, in parallel, or in a mixed manner, the mixed manner referring to that the multiple battery monomers 20 are connected in series and in parallel. The multiple battery monomers 20 can be directly connected in series, in parallel, or in a mixed manner, and the whole formed by the multiple battery monomers 20 is contained in the box body 10. Of course, the battery 100 can also be that the multiple battery monomers 20 are first connected in series, in parallel, or in a mixed manner to form a battery module, and the multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole, which is contained in the box body 10. The battery 100 can further include other structures, for example, the battery 100 can further include a current combing component for realizing electrical connection between the multiple battery monomers.

[0074] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0075] Please refer to Figures 3 to 6 As shown, a battery cell refers to the smallest unit that makes up a battery.

[0076] The battery cell 20 includes a housing 21, an electrode assembly 22, an end cap assembly 23, an adapter 24, and an insulator 25. The housing 21 has an opening 211. The electrode assembly 22 is disposed within the housing 21 and includes tabs 221. The end cap assembly 23 closes the opening 211 and includes electrode terminals 232. The adapter 24 is disposed within the housing 21 and is used to electrically connect the tabs 221 and the electrode terminals 232. The insulator 25 is disposed within the housing 21 and is used to insulate the adapter 24 from the housing 21.

[0077] Optionally, the housing 21 is an assembly used to cooperate with the end cap assembly 23 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, electrolyte and other components.

[0078] Optionally, the housing 21 and the end cap assembly 23 can be separate components. An opening 211 can be provided on the housing 21, and the end cap assembly 23 can be used to close the opening 211 to form the internal environment of the battery cell 20.

[0079] Optionally, the housing 21 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 21 can be determined according to the specific shape and size of the electrode assembly 22.

[0080] Optionally, the material of the housing 21 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0081] Optionally, the electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 22 can be contained within the casing 21. The electrode assembly 22 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials constituting a main body of the electrode assembly 22, and portions without active materials each constituting a tab 221. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at two ends of the main body respectively. During charging and discharging of the battery, the positive electrode active material and the negative electrode active material react with an electrolyte, and the tab 221 connects an electrode terminal 232 to form a current loop.

[0082] Optionally, the end cover assembly 23 refers to a component that covers the opening 211 of the casing 21 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover assembly 23 can be adapted to the shape of the casing 21 to fit the casing 21. Optionally, the end cover assembly 23 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover assembly 23 is less likely to deform when subjected to extrusion and impact, enabling the battery cell 20 to have higher structural strength and improved safety performance.

[0083] Optionally, the end cover assembly 23 includes an end cover 231 and an electrode terminal 232 provided on the end cover 231. When the number of end cover assemblies 23 included in the battery cell 20 is one, the number of electrode terminals 232 included in the end cover assembly 23 is two, and when the number of end cover assemblies 23 included in the battery cell 20 is two, the number of electrode terminals 232 included in each end cover assembly 23 is one and the polarities of the electrode terminals 232 on the two end cover assemblies 23 are opposite.

[0084] Correspondingly, the number of openings 211 of the casing 21 can be one or two, and when the number is two, the two openings 211 are oppositely arranged, and one end cover assembly 23 can be covered at each opening 211, and each end cover assembly 23 is electrically connected to one of the tabs 221.

[0085] Optionally, the adapter 24 is used to electrically connect the tab 221 of the electrode assembly 22 and the electrode terminal 232 of the end cover assembly 23, and the adapter 24 can be made of metal.

[0086] Optionally, the adapter 24 can include two parts intersecting with each other, one part being electrically connected to the electrode terminal 232 and the other part being electrically connected to the tab 221.

[0087] Optionally, the insulating member 25 is at least partially located between the casing 21 and the adapter 24. Optionally, the insulating member 25 covers at least one end of the adapter 24 away from the electrode terminal 232.

[0088] Optionally, the insulation piece 25 can be directly connected to the shell 21 opposite to the adapter piece 24. The insulation piece 25 can also be connected to the tab 221 and cover at least part of the adapter piece 24. Of course, in some embodiments, when other insulation structures are arranged between the shell 21 and the electrode assembly 22, the insulation piece 25 can also be connected to the other insulation structures.

[0089] Optionally, the insulation piece can be a sheet-shaped or film-shaped structure.

[0090] The battery monomer 20 provided by the embodiments of the present application includes a shell 21, an electrode assembly 22, an end cover assembly 23, an adapter piece 24, and an insulation piece 25. The electrode assembly 22 is arranged in the shell 21, and the end cover assembly 23 is arranged to close the opening 211 of the shell 21. The adapter piece 24 is used to electrically connect the tab 221 of the electrode assembly 22 and the electrode terminal 232. Since the insulation piece 25 is arranged in the shell 21 and is used to insulate the adapter piece 24 from the shell 21, when the battery is in thermal runaway and the electrode assembly 22 in the battery monomer 20 expands and deforms, even if the adapter piece 24 moves to the side where the shell 21 is located, the insulation piece 25 can prevent the adapter piece 24 from being in electrical contact with the shell 21, thereby effectively improving the safety performance of the battery monomer 20 and the battery to which the battery monomer 20 is applied.

[0091] In some optional embodiments, the shell 21 is formed with an opening 211 in a first direction X, the electrode assembly 22 is provided with a tab 221 at both ends in a second direction Y, and along a third direction Z, the width dimension of the insulation piece 25 is smaller than the width dimension of the adapter piece 24. The first direction X, the second direction Y, and the third direction Z are arranged to intersect each other.

[0092] Optionally, the first direction X can be the height direction of the shell 21, the second direction Y can be the length direction of the shell 21, and the third direction Z can be the width direction of the shell 21. Optionally, two of the first direction X, the second direction Y, and the third direction Z can be perpendicular to each other.

[0093] Optionally, the electrode assembly 22 is provided with a tab 221 at both ends in the second direction Y, and the two tabs 221 are arranged to be spaced apart and opposite to each other.

[0094] Optionally, the width dimension of the insulation piece 25 in the third direction Z is smaller than the size of the adapter piece 24.

[0095] The battery monomer 20 provided by the embodiments of the present application ensures that after the insulation piece 25 is installed between the adapter piece 24 and the shell 21, interference with other insulation films during assembly can be avoided, by making the width dimension of the insulation piece 25 along the third direction Z smaller than the width dimension of the adapter piece 24.

[0096] In some optional embodiments, the orthogonal projection of the insulating piece 25 on the adapter piece 24 forms a spacing T with the edge of the adapter piece 24 in the third direction Z, and the spacing T is in a range of 0.5mm to 1mm.

[0097] Optionally, the orthogonal projection of the insulating piece 25 on the adapter piece 24 forming the spacing T with the edge of the adapter piece 24 in the third direction Z can be understood as that the adapter piece 24 has two opposite edges in the third direction Z, and the orthogonal projection of the insulating piece 25 on the adapter piece 24 forms a vertical distance between the two opposite edges of the adapter piece 24.

[0098] Optionally, the spacing T is in a range of any value between 0.5mm and 1mm, including the end value of 0.5mm.

[0099] Optionally, the spacing T is in a range of 0.5mm to 0.8mm, and exemplarily, the spacing T can be 0.6mm or 0.7mm.

[0100] The battery monomer 20 provided by the embodiments of the present application can ensure the insulation requirement between the adapter piece 24 and the shell 21 when the battery monomer 20 is in thermal diffusion by making the orthogonal projection of the insulating piece 25 on the adapter piece 24 form a spacing T with the edge of the adapter piece 24 in the third direction Z, and the spacing T is in a range of any value between 0.5mm and 1mm, and meanwhile, the above setting can avoid the interference phenomenon when other insulating film layers are coated on the electrode assembly 22.

[0101] In some optional embodiments, the thickness of the insulating piece 25 is less than or equal to 0.5mm.

[0102] Optionally, the thickness of the insulating piece 25 can be understood as the thickness of the sheet layer, and optionally, the thickness of the insulating piece 25 can be understood as the thickness of the insulating piece 25 in the second direction Y.

[0103] Optionally, the thickness of the insulating piece 25 can be equal to 0.5mm, and of course, can be less than 0.5mm, for example, 0.4mm or 0.3mm.

[0104] The battery monomer 20 provided by the embodiments of the present application can reduce the occupied space of the insulating piece 25 and improve the energy density of the battery monomer 20 by making the thickness of the insulating piece 25 less than or equal to 0.5mm on the basis of ensuring the insulation requirement of the battery monomer 20.

[0105] As Figures 3 to 7As shown, in some optional embodiments, the battery cell 20 provided by the embodiments of the present application has the adapter 24 with opposite first and second end portions 24a and 24b. The first end portion 24a is connected with the electrode terminal 232, and the second end portion 24b extends away from the end cover assembly 23 and is arranged beyond the tab 221. The insulating member 25 covers the second end portion 24b along the second direction Y.

[0106] Optionally, the adapter 24 can include the first and second connecting pieces 241 and 242 arranged in intersection. The first connecting piece 241 is arranged in stack with and electrically connected with the electrode terminal 232. The second connecting piece 242 is arranged in stack with and electrically connected with the tab 221. The first end portion 24a can be located at the first connecting piece 241, and the second end portion 24b can be located at the second connecting piece 242.

[0107] Optionally, the second connecting piece 242 has opposite two sides along the first direction X, one of which is connected with the first connecting piece 241, and the other of which forms the second end portion 24b.

[0108] Optionally, the second end portion 24b extending away from the end cover assembly 23 and arranged beyond the tab 221 can be understood as the second end portion 24b extending away from the end cover assembly 23 and arranged beyond the tab 221 along the first direction X.

[0109] Optionally, the insulating member 25 covering the second end portion 24b can be understood as the insulating member 25 covering the second end portion 24b along the second direction Y.

[0110] When the battery cell 20 is in thermal diffusion, the electrode assembly 22 will be deformed and expanded to increase the volume, and the side where the second end portion 24b of the insulating member 25 is located cooperates with the tab 221, and the side where the first end portion 24a is located is connected with the electrode terminal 232. When the electrode assembly 22 is deformed and expanded, the part of the adapter 24 connected therewith will also be deformed. That is, the second end portion 24b first warps to the side where the housing 21 is located. The battery cell 20 provided by the embodiments of the present application covers the second end portion 24b with the insulating member 25, so that when the battery cell 20 is in thermal diffusion, the insulating member 25 can insulate the second end portion 24b from the housing 21, thereby ensuring the safety performance of the battery cell 20.

[0111] In some optional embodiments, the insulating member 25 is arranged in stack with the tab 221 and is connected with the tab 221 and the second end portion 24b.

[0112] Optionally, the tab 221 can be arranged in bending, and the bent part can be arranged in stack on the surface of the insulating member 25 facing the side wall of the housing 21.

[0113] Optionally, the insulating member 25 and the tab 221 can be connected with each other by adhesion or the like.

[0114] Optionally, the insulating element 25 and the second end 24b can be connected to each other by means of bonding or other methods.

[0115] The battery cell 20 provided in this application embodiment, by stacking the insulating member 25 and the tab 221 and connecting them to the tab 221 and the second end 24b, can not only ensure the installation and fixing requirements of the insulating member 25, but also cover the second end 24b, avoiding the risk of short circuit caused by contact between the adapter piece 24 and the housing 21 when the battery cell 20 is thermally diffused.

[0116] like Figures 3 to 8 As shown, in some optional embodiments, the battery cell 20 provided in this application embodiment has its second end 24b bent toward the side wall of the housing 21 along the second direction Y to form a stepped surface, and the stepped surface is used to support the insulating member 25.

[0117] Optionally, the second end 24b can be bent along the second direction Y towards the side wall of the housing 21.

[0118] Optionally, the surface of the second end 24b facing the sidewall in the first direction X is flush with the surface of the tab 221 facing the sidewall in the first direction X.

[0119] Optionally, the stepped surface may include a first surface 2421, a second surface 2422, and a transition surface 2423 connecting the first surface 2421 and the second surface 2422. The second surface 2422 is used to support the insulating member 25. Along the second direction Y, the vertical distance between the second surface 2422 and the side wall of the housing 21 is less than the vertical distance between the first surface 2411 and the side wall of the housing.

[0120] The battery cell 20 provided in this application embodiment, through the above-mentioned arrangement, allows the insulating member 25 to be extended along the plane when connected to the tab 221 and the second end 24b, without the need for bending. This not only ensures the connection requirements between the insulating member 25 and the tab 221 and the second end 24b, but also optimizes the insulation effect.

[0121] The embodiments described above are illustrative examples of the interconnection between the insulating member 25, the tab 221, and the second end 24b. This is an optional implementation method, but is not limited to the above-described manner.

[0122] like Figure 9 As shown, in some alternative embodiments, the insulating element 25 may also be connected to the housing 21.

[0123] Optionally, the insulating element 25 and the housing 21 can be connected by means of bonding or other methods.

[0124] The battery monomer 20 provided by the embodiment of the present application is connected with the insulation piece 25 and the shell 21, when the battery monomer 20 is in thermal diffusion, even if the adapter piece 24 moves to the shell 21, because the insulation piece 25 is connected with one of the protection film 26 and the shell 21, the adapter piece 24 and the shell 21 can be separated and insulated, and the safety performance of the battery monomer 20 is ensured.

[0125] As shown in Figures 10 to 14 In some optional embodiments, the battery monomer 20 provided by the embodiment of the present application further comprises a protection film 26, the protection film 26 is used for insulating the electrode assembly 22 and the shell 21, and the insulation piece 25 is arranged between the protection film 26 and the shell 21 and connected with one of the protection film 26 and the shell 21.

[0126] Optionally, the protection film 26 can be a box-shaped structure with an opening, and the opening of the protection film 26 is arranged on the same side as the opening 211 of the shell 21.

[0127] Optionally, the protection film 26 has an open form and a folded form, and in the open form, it is a flat plate structure, and in the folded form, it is a box-shaped structure.

[0128] The battery monomer 20 provided by the embodiment of the present application can insulate the whole electrode assembly 22 and the shell 21 by arranging the protection film 26, and double protection is formed with the insulation piece 25.

[0129] In some optional embodiments, the battery monomer 20 provided by the embodiment of the present application is connected to the surface of the protection film 26 away from the adapter piece 24.

[0130] Optionally, the electrode assembly 22 and the adapter piece 24 can be located in the protection film 26, and the insulation piece 25 is located outside the protection film 26 and between the protection film 26 and the shell 21.

[0131] Optionally, along the first direction X, the orthographic projection of the insulation piece 25 on the protection film 26 covers the orthographic projection of the second end portion 24b on the protection film 26.

[0132] Optionally, the insulation piece 25 and the protection film 26 can be connected with each other by bonding or the like.

[0133] The battery monomer 20 provided by the embodiment of the present application is connected between the protection film 26 and the shell 21, which can ensure the connection requirement between the insulation piece 25 and the protection film 26, and when the protection film 26 is damaged by the adapter piece 24, the insulation piece 25 can provide insulation protection again, avoiding the risk of short circuit caused by the contact between the adapter piece 24 and the shell 21 when the battery monomer 20 is in thermal diffusion.

[0134] In some optional embodiments, the battery monomer 20 provided by the embodiments of the present application, the protective film 26 includes a bottom surface 263, a first side wall surface 261 and a second side wall surface 262 arranged intersecting with each other, the area of the first side wall surface 261 is greater than the area of the second side wall surface 262, the second side wall surface 262 faces the tab 221 and the adapter piece 24, and the insulating piece 25 is arranged on the second side wall surface 262 and matches the shape of the second side wall surface 262.

[0135] Optionally, the first side wall surface 261 is arranged in pairs and spaced apart and arranged oppositely in the third direction Z, and the second side wall surface 262 is arranged in pairs and spaced apart and arranged oppositely in the second direction Y. The second side wall surface 262 arranged in pairs is located between the first side wall surface 261 arranged in pairs, and the bottom surface 263 is located at the same end of the first side wall surface 261 and the second side wall surface 262 in the first direction X and connected with the first side wall surface 261 arranged in pairs and the second side wall surface 262 arranged in pairs.

[0136] Optionally, the surface of the second side wall surface 262 facing the shell 21 can be bonded to the protective film 26.

[0137] Optionally, the insulating piece 25 can be pre-bonded to the protective film 26 when the protective film 26 is in an open form, and when the protective film 26 is folded into a folded form, the insulating piece 25 is folded with the protective film 26 to a position opposite the adapter piece 24.

[0138] The battery monomer 20 provided by the embodiments of the present application can ensure that the position of the insulating piece 25 corresponds to the position of the adapter piece 24, and can make the insulating piece 25 connect to the protective film 26 first, which is beneficial to the connection between the two and the shapes can match each other, which is beneficial to the assembly into the shell 21.

[0139] In some optional embodiments, the melting point of the insulating piece 25 is greater than or equal to the melting point of the protective film 26.

[0140] The battery monomer 20 provided by the embodiments of the present application can ensure that the position of the insulating piece 25 corresponds to the position of the adapter piece 24, and can make the insulating piece 25 connect to the protective film 26 first, which is beneficial to the connection between the two and the shapes can match each other, which is beneficial to the assembly into the shell 21.

[0141] In some optional embodiments, the battery monomer 20 provided by the embodiments of the present application, the strength of the insulating piece 25 is greater than or equal to the strength of the protective film 26.

[0142] Optionally, the strength of the insulation piece 25 is greater than or equal to the strength of the protective film 26, which can be understood as the ability of the insulation piece 25 to resist permanent deformation and breakage under external force is greater than or equal to the ability of the protective film 26 to resist permanent deformation and breakage under external force.

[0143] Optionally, the hardness of the material of the insulation piece 25 can be greater than the hardness of the protective film 26, of course, the thickness of the insulation piece 25 can also be greater than the thickness of the protective film 26, both of which can achieve the strength of the insulation piece 25 greater than the strength of the protective film 26.

[0144] The battery monomer 20 provided by the embodiment of the present application makes the strength of the insulation piece 25 greater than the strength of the protective film 26, so that when the battery monomer 20 is deformed due to heat diffusion of the electrode assembly 22, even if the adapter 24 pokes the protective film 26, the insulation piece 25 can still be protected to avoid damage to the battery monomer 20.

[0145] In some optional embodiments, the battery monomer 20 provided by the embodiment of the present application is adhesively connected with one of the protective film 26 and the shell 21.

[0146] Optionally, the insulation piece 25 can be adhesively connected with the protective film 26, of course, the insulation piece 25 can also be adhesively connected with the shell 21.

[0147] The battery monomer 20 provided by the embodiment of the present application is beneficial to the fixation of the position of the insulation piece 25, and can ensure the stability of the connection between the insulation piece 25 and one of the protective film 26 and the shell 21.

[0148] In a second aspect, the embodiment of the present application also provides a battery, which includes the battery monomer 20 described above.

[0149] In a third aspect, the present application provides a power consuming device, which includes the battery described above. The power consuming device can be a device or system to which any of the above-mentioned batteries is applied.

[0150] As Figures 3 to 8As shown, the battery cell 20 provided by the embodiments of the present application includes a shell 21, an electrode assembly 22, an end cover assembly 23, an adapter 24, a protective film 26 and an insulating member 25. The shell 21 is a square shell 21 and has an opening 211 in a first direction X. The electrode assembly 22 is arranged in the shell 21. The electrode assembly 22 includes two tabs 221 which are arranged in a second direction Y and opposite to each other. The end cover assembly 23 is arranged to close the opening 211. The end cover assembly 23 includes two electrode terminals 232, one of which is a positive electrode terminal 232 and the other is a negative electrode terminal 232. The adapter 24 is arranged in the shell 21. The number of the adapters 24 is two. Each adapter 24 is connected between one of the tabs 221 and the electrode terminal 232, for electrically connecting the tab 221 and the electrode terminal 232. The protective film 26 is arranged between the electrode assembly 22 and the shell 21. The protective film 26 is arranged to insulate the electrode assembly 22 and the shell 21. The insulating member 25 is arranged between the protective film 26 and the shell 21 and connected with the protective film 26. The orthographic projection of the insulating member 25 on the adapter 24 is spaced apart from the edge of the adapter 24 in a third direction Z by a distance T. The distance T is in a range of 0.5mm to 1mm. The thickness of the insulating member 25 is less than or equal to 0.5mm.

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in the embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery monomer comprises: a shell having an opening; an electrode assembly arranged in the shell, the electrode assembly comprising a tab; a terminal cover assembly arranged to close the opening, the terminal cover assembly comprising an electrode terminal; a connector arranged in the shell and used to electrically connect the tab and the electrode terminal; an insulating member arranged in the shell, the insulating member being used to insulate the connector from the shell; the shell is formed with the opening in a first direction, the electrode assembly is provided with the tab at both ends in a second direction, and along a third direction, the width dimension of the insulating member is smaller than that of the connector, and the first direction, the second direction and the third direction are arranged to intersect with each other; a normal projection of the insulating member on the connector is formed with a spacing T from opposite edges of the connector in the third direction, and the spacing T ranges from 0.5 mm to 1 mm; the battery monomer further comprises a protective film, the protective film being used to insulate the electrode assembly from the shell.

2. The battery cell of claim 1, wherein, The thickness of the insulating member is less than or equal to 0.5 mm.

3. The battery cell of claim 1, wherein, The connector has opposite first and second end portions, the first end portion is connected with the electrode terminal, the second end portion extends away from the terminal cover assembly and is arranged beyond the tab, and along the second direction, the insulating member covers the second end portion.

4. The battery cell of claim 3, wherein, The insulating member is arranged in a stack with the tab and is connected with the tab and the second end portion.

5. The battery cell of claim 4, wherein, Along the second direction, the second end portion is arranged to bend towards the side of the shell and forms a stepped surface, and the stepped surface is used to support the insulating member.

6. The battery cell according to any one of claims 1 to 3, characterized in that The insulating member is connected with the shell.

7. The battery cell according to any one of claims 1 to 3, characterized in that The insulating member is arranged between the protective film and the shell and is connected with one of the protective film and the shell.

8. The battery cell of claim 7, wherein, The insulating member is connected to the surface of the protective film away from the connector.

9. The battery cell of claim 8, wherein, The protective film comprises a bottom surface, a first side wall surface and a second side wall surface arranged to intersect with each other, the area of the first side wall surface is greater than that of the second side wall surface, the second side wall surface faces the tab and the connector, the insulating member is arranged on the second side wall and matches the shape of the second side wall.

10. The battery cell of claim 7, wherein, The melting point of the insulating member is greater than or equal to that of the protective film.

11. The battery cell of claim 7, wherein, The strength of the insulating member is greater than or equal to that of the protective film.

12. The battery cell of claim 7, wherein, The insulating member is adhesively connected with one of the protective film and the shell.

13. A battery, characterized by The battery comprises the battery monomer according to any one of claims 1 to 12.

14. An electrical device, characterized by The battery comprises the battery monomer according to claim 13.

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