Battery monomer, battery and electric equipment

Abstract

The embodiment of the invention provides a battery monomer, a battery and electric equipment. The battery cell includes a housing, a first electrode terminal, an electrode assembly, a first insulator, and a second insulator. The shell comprises a first wall; the first electrode terminal is arranged on the first wall in an insulating manner; the electrode assembly is arranged in the shell, the electrode assembly comprises a main body part and a first tab, the main body part is flat, the main body part is provided with a first end face facing the first wall, the first tab is arranged on the first end face, and the first tab is electrically connected with the first electrode terminal; the first insulating part and the second insulating part are arranged in the shell, and the first tab is located between the first insulating part and the second insulating part in the thickness direction of the main body part.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are 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 advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] During the manufacturing process of batteries, the reliability of batteries is an issue that cannot be ignored. Therefore, how to improve the reliability of batteries is a technical problem that needs to be solved urgently in battery technology. Summary of the invention

[0004] The present application provides a battery cell, a battery and an electrical device, which can improve the reliability of the battery.

[0005] This application is achieved through the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a battery cell, which includes a housing, a first electrode terminal, an electrode assembly, a first insulating member, and a second insulating member. The housing includes a first wall; the first electrode terminal is insulated and arranged on the first wall; the electrode assembly is arranged in the housing, and the electrode assembly includes a main body and a first pole ear, the main body is flat, the main body has a first end face facing the first wall, the first pole ear is arranged on the first end face, and the first pole ear is electrically connected to the first electrode terminal; the first insulating member and the second insulating member are arranged in the housing, and along the thickness direction of the main body, the first pole ear is located between the first insulating member and the second insulating member.

[0007] According to the battery cell of the embodiment of the present application, by arranging the first insulating member and the second insulating member in the outer shell, along the thickness direction of the main body, the first pole ear is located between the first insulating member and the second insulating member, the orthographic projection of the first pole ear in the thickness direction of the main body at least partially overlaps with the orthographic projection of the first insulating member in the thickness direction of the main body, and the orthographic projection of the first pole ear in the thickness direction of the main body at least partially overlaps with the orthographic projection of the second insulating member in the thickness direction of the main body. The first insulating member and the second insulating member can insulate and isolate the first pole ear from the outer shell in the thickness direction of the main body, reduce the risk of short circuit between the first pole ear and the outer shell, and make the battery cell have higher reliability.

[0008] According to some embodiments of the present application, the orthographic projection of the first pole tab in the thickness direction of the main body falls into the orthographic projection of the first insulating member in the thickness direction of the main body, and the orthographic projection of the first pole tab in the thickness direction of the main body falls into the orthographic projection of the second insulating member in the thickness direction of the main body.

[0009] In the above scheme, the orthographic projection of the first pole ear in the thickness direction of the main body falls into the orthographic projection of the first insulating member in the thickness direction of the main body, so that the first insulating member and the first pole ear have a larger overlapping area; the orthographic projection of the first pole ear in the thickness direction of the main body falls into the orthographic projection of the second insulating member in the thickness direction of the main body, so that the second insulating member and the first pole ear have a larger overlapping area, so that the first insulating member and the second insulating member can effectively insulate and isolate the first pole ear from the shell.

[0010] According to some embodiments of the present application, the first insulating member is disposed between the first wall and the first end surface.

[0011] In the above solution, the first insulating member is disposed between the first wall and the first end face. When viewed along the thickness direction of the first wall, the first insulating member and the first end face have a large overlapping area. The first insulating member can position the electrode assembly.

[0012] According to some embodiments of the present application, the first insulating member contacts the first wall and the first end surface respectively.

[0013] In the above solution, the first insulating member is in contact with the first wall and the first end surface respectively, and the first insulating member can realize the positioning of the electrode assembly and limit the movement of the electrode assembly toward the first wall.

[0014] According to some embodiments of the present application, the first insulating member includes a main body and a protrusion. Along the thickness direction of the main body, the first pole ear is located between the main body and the second insulating member. The main body has a first surface facing the second insulating member. The protrusion is connected to the main body and protrudes from the first surface.

[0015] In the above solution, the protrusion protrudes from the first surface, and the size of the body in the thickness direction of the main body can be small to reduce space occupation; at the same time, the strength of the body can be increased. When the first insulating member contacts the first wall and the first end face respectively, the provision of the protrusion can increase the contact area between the first insulating member and the first wall and the first end face, so as to have a better positioning effect on the electrode assembly.

[0016] According to some embodiments of the present application, the first pole ear is located at one end of the main body in the length direction, the main body extends along the width direction of the main body, the number of protrusions is multiple, and the multiple protrusions are arranged at intervals along the width direction of the main body. Along the width direction of the main body, the first pole ear is located between two adjacent protrusions.

[0017] In the above scheme, the first pole ear is located between two adjacent protrusions, and can have a larger overlapping area with the first pole ear in the width direction of the main body, so as to form an insulating isolation for the first pole ear in the width direction of the main body, thereby reducing the probability of the first pole ear contacting the outer shell; the number of protrusions is multiple, which can increase the strength of the main body; when the first insulating member is used to position the electrode assembly, the number of protrusions is multiple, which can increase the positioning of the electrode assembly at multiple positions.

[0018] According to some embodiments of the present application, along the width direction of the main body, the orthographic projection of the first electrode ear falls within the orthographic projection of the protruding portion.

[0019] In the above scheme, the orthographic projection of the first pole ear falls into the orthographic projection of the protrusion, which can increase the insulation effect of the protrusion on the first pole ear on the one hand, and on the other hand, the protrusion can have a larger overlapping area with the electrode assembly to have a better positioning effect on the electrode assembly.

[0020] According to some embodiments of the present application, the body, two adjacent protrusions, and the second insulating member define an accommodating space for accommodating the first electrode tab.

[0021] In the above solution, the first pole ear is accommodated in the accommodation space, which has a good insulation effect on the first pole ear and reduces the probability of the first pole ear contacting the shell.

[0022] According to some embodiments of the present application, the electrode assembly also includes a second pole ear having a polarity opposite to that of the first pole ear, the second pole ear and the first pole ear are located at the same end in the length direction of the main body, and along the width direction of the main body, the second pole ear is located between two adjacent protrusions.

[0023] In the above scheme, the second pole ear and the first pole ear are located at the same end in the length direction of the main body, which is convenient for the extraction of electric energy from the electrode assembly and the assembly of the electrode assembly with the outer shell; the second pole ear is located between two adjacent protrusions, and the first insulating member has a larger size in the width direction of the main body, so as to have a better positioning effect on the electrode assembly.

[0024] According to some embodiments of the present application, the plurality of protrusions include a first protrusion, a second protrusion and a third protrusion. Along the width direction of the main body, the first protrusion and the second protrusion are respectively located at opposite ends of the main body, the third protrusion is located between the first protrusion and the second protrusion, the first pole ear is located between the first protrusion and the third protrusion, and the second pole ear is located between the second protrusion and the third protrusion.

[0025] In the above scheme, the first pole ear is located between the first protrusion and the third protrusion, and the second pole ear is located between the second protrusion and the third protrusion, which can form insulation isolation for the first pole ear and the second pole ear in the width direction of the main body, reducing the probability of the first pole ear and the second pole ear contacting the shell. When the first insulating member contacts the first wall and the first end face respectively, the first protrusion and the second protrusion are located at both ends of the body along the width direction of the main body, and the third protrusion is located between the first protrusion and the second protrusion, so that the first insulating member can stabilize the positioning of the electrode assembly and limit the movement of the electrode assembly toward the first wall.

[0026] According to some embodiments of the present application, the first wall is provided with a liquid injection hole, and the third protrusion is provided with a gap avoidance portion, and along the length direction of the main body, the gap avoidance portion at least partially overlaps with the liquid injection hole.

[0027] In the above solution, the provision of the air-avoiding portion can reduce the influence of the first insulating member on the liquid injection, so as to facilitate the electrode assembly to be infiltrated with the electrolyte.

[0028] According to some embodiments of the present application, the main body further has a second surface facing away from the second insulating member. Along the thickness direction of the main body, the distance between the second surface and the first surface is W0, and the maximum distance between the protrusion and the first surface is W1, satisfying W1>W0.

[0029] In the above solution, the dimension of the protrusion protruding from the first surface is greater than the distance between the second surface and the first surface, so that the dimension of the body in the thickness direction of the main body can be smaller, which can reduce space occupation.

[0030] According to some embodiments of the present application, the wall thickness of the shell is W2, the size of the battery cell along the thickness direction of the main body is W, and the maximum distance between the protrusion and the second surface is W3, satisfying 2W2≤W-W3≤W / 10.

[0031] In the above scheme, the difference between the dimension W of the battery cell in the thickness direction of the main body and the maximum distance W3 between the protrusion and the second surface satisfies the above relationship (2W2≤W-W3≤W / 10), which can reduce the assembly interference between the first insulating part and the outer shell. The first insulating part can also have a larger dimension in the thickness direction of the main body, which can not only increase the insulating effect of the first insulating part on the first pole ear in the width direction of the main body, but also make the first insulating part and the electrode assembly have a larger overlapping area, which is convenient for positioning the electrode assembly.

[0032] According to some embodiments of the present application, the second insulating member includes a first part and a second part connected to each other, and along the thickness direction of the main body, the first pole ear is located between the first part and the first insulating member; the first pole ear is located at one end of the main body in the length direction, and along the length direction of the main body, the second part is arranged between the first wall and the first pole ear.

[0033] In the above solution, the first part can achieve insulation isolation between the first pole ear and the shell in the thickness direction of the main body, and the second part can achieve insulation isolation between the first pole ear and the first wall in the length direction of the main body, which can reduce the risk of short circuit between the first pole ear and the shell.

[0034] According to some embodiments of the present application, the battery cell also includes a first adapter, which is connected to the first pole ear. Along the length direction of the main body, the second part is arranged between the first adapter and the first wall, and the first electrode terminal passes through the second part to be electrically connected to the first adapter.

[0035] In the above solution, the first adapter realizes the electrical connection between the first electrode tab and the first electrode terminal, which facilitates the extraction or import of electrical energy of the electrode assembly.

[0036] According to some embodiments of the present application, along a thickness direction of the main body, the second portion contacts the first insulating member.

[0037] In the above solution, the second part is in contact with the first insulating member, which can provide a better insulating effect on the first electrode tab. Meanwhile, the second part can position the first insulating member.

[0038] According to some embodiments of the present application, the first insulating member includes a body and a protrusion, the body includes a first surface facing the second insulating member and a second surface away from the second insulating member, the protrusion protrudes from the first surface, and the second portion contacts the first surface.

[0039] In the above solution, the second part contacts the first surface to position the first insulating member; the body, the protrusion, the first part and the second part insulate the first pole ear from different positions, reducing the risk of the first pole ear contacting the housing.

[0040] According to some embodiments of the present application, along the thickness direction of the main body, the distance between the second surface and the first surface is W0, satisfying 0.05mm≤W0≤1mm.

[0041] In the above solution, the distance W0 between the second surface and the first surface satisfies the above relationship (0.05mm≤W0≤1mm), the main body occupies a smaller assembly space, and has higher strength itself, and can provide better support effect for the electrode assembly.

[0042] According to some embodiments of the present application, 0.2mm≤W0≤0.6mm.

[0043] In the above scheme, compared with W0<0.2mm, when W0≥0.2mm, the size of the main body in the thickness direction of the main body is larger, the main body has higher strength, and can have a better supporting effect on the electrode assembly; compared with W0>0.6mm, when W0≤0.6mm, the main body occupies a smaller assembly space.

[0044] According to some embodiments of the present application, the shell also includes a second wall and a third wall, the second wall and the third wall are arranged relative to each other in the thickness direction of the main body, the first insulating member is a first insulating layer arranged on the inner surface of the second wall, and the second insulating member is a second insulating layer arranged on the inner surface of the third wall.

[0045] In the above solution, the first insulating member is a first insulating layer arranged on the inner surface of the second wall, and the second insulating member is a second insulating layer arranged on the inner surface of the third wall, which has a simple structure and is easy to manufacture.

[0046] According to some embodiments of the present application, the first insulating layer is bonded and fixed to the second wall, and the second insulating layer is bonded and fixed to the third wall.

[0047] In the above solution, the first insulating layer is bonded and fixed to the second wall, and the second insulating layer is bonded and fixed to the third wall, which is simple to operate and has low processing and manufacturing difficulty.

[0048] According to some embodiments of the present application, the shell also includes a second wall and a third wall, the second wall and the third wall are arranged relative to each other in the thickness direction of the main body, the first insulating member is a first insulating coating coated on the inner surface of the second wall, and the second insulating member is a second insulating coating coated on the inner surface of the third wall.

[0049] In the above solution, the first insulating member is a first insulating coating coated on the inner surface of the second wall, and the second insulating member is a second insulating coating coated on the inner surface of the third wall. The operation is simple and the processing difficulty is low.

[0050] According to some embodiments of the present application, the first insulating coating and the second insulating coating both include at least one of polyester resin, polyurethane, and epoxy resin.

[0051] In the above scheme, at least one of polyester resin, polyurethane and epoxy resin is used, which has a better insulation effect.

[0052] According to some embodiments of the present application, the thickness of the first insulating coating layer and the thickness of the second insulating coating layer are both M, satisfying 0.005 mm ≤ M ≤ 0.2 mm.

[0053] In the above solution, the thickness of the first insulating coating and the thickness of the second insulating coating satisfy the above relationship (0.005mm≤M≤0.2mm), which has a good insulating effect, saves materials, and occupies less space.

[0054] According to some embodiments of the present application, 0.01 mm≤M≤0.1 mm.

[0055] In the above scheme, the thickness of the first insulating coating and the thickness of the second insulating coating satisfy the above relationship (0.01mm≤M≤0.1mm), and less material is used and less space is occupied while having a better insulating effect.

[0056] According to some embodiments of the present application, the outer shell includes an end cover and a shell body, the shell body includes a bottom wall and multiple side walls, the multiple side walls are arranged around the edge of the bottom wall, along the thickness direction of the main body, one end of the multiple side walls is connected to the bottom wall, the other ends of the multiple side walls form an opening, and the end cover closes the opening; the first wall is one of the multiple side walls.

[0057] In the above solution, the first wall is a side wall, which facilitates the electrical connection between the first electrode terminal and the external component.

[0058] According to some embodiments of the present application, an area of ​​an outer surface of the bottom wall is greater than an area of ​​an outer surface of any one of the side walls.

[0059] In the above solution, the bottom wall and the end cover may be the large surface (wall with a larger area) of the battery cell, so that a plurality of battery cells can be stacked in a direction perpendicular to the bottom wall, so as to reduce space occupation.

[0060] According to some embodiments of the present application, the electrode assembly further includes a second pole ear having a polarity opposite to that of the first pole ear, the second pole ear and the first pole ear are located at the same end in the length direction of the main body, and the second pole ear is electrically connected to the first wall.

[0061] In the above solution, the second electrode tab is electrically connected to the first wall, which can reduce parts and reduce costs.

[0062] In a second aspect, an embodiment of the present application further provides a battery, which includes a battery cell provided in any of the above embodiments.

[0063] In a third aspect, an embodiment of the present application further provides an electrical device, which includes a battery cell or a battery as provided in any of the above embodiments, and the battery cell or the battery is used to provide electrical energy.

[0064] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0066] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0067] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0068] Figure 3 An exploded view of a battery cell provided for some embodiments of the present application;

[0069] Figure 4 A cross-sectional view of a battery cell provided for some embodiments of the present application;

[0070] Figure 5 for Figure 4 A local enlarged view of point A;

[0071] Figure 6 An exploded view of a battery cell provided in some other embodiments of the present application;

[0072] Figure 7 A schematic structural diagram of a first insulating member provided in some embodiments of the present application;

[0073] Figure 8 A schematic diagram of the structure of a second insulating member provided in some embodiments of the present application;

[0074] Fig. 9 An exploded view of a battery cell provided in some other embodiments of the present application;

[0075] Fig.10 for Fig. 9 A schematic structural diagram of a second insulating member disposed on the third wall;

[0076] Fig.11 A schematic diagram of the cooperation between the first electrode tab and the first insulating member and the second insulating member provided in some embodiments of the present application;

[0077] Fig.12 An exploded view of a battery cell provided in some other embodiments of the present application;

[0078] Fig.13 for Fig.12 A schematic structural diagram of a second insulating member disposed on the third wall;

[0079] Fig.14 A schematic diagram of the assembly of the second wall and the first insulating member provided in some embodiments of the present application.

[0080] Icon: 100-battery; 10-box; 11-first sub-box; 12-second sub-box; 20-battery cell; 21-housing; 211-first wall; 2111-liquid injection hole; 212-housing; 2121-bottom wall; 2122-side wall; 213-end cover; 214-second wall; 215-third wall; 22-first electrode terminal; 23-electrode assembly; 231-main body; 2311-first end face; 232-first pole ear; 233-second pole ear; 24-first insulating member; 241-body; 241a-first surface surface; 241b-second surface; 242-protrusion; 242a-first protrusion; 242b-second protrusion; 242c-third protrusion; 2421-hollow structure; 243-air-avoiding portion; 25-second insulating member; 251-first part; 252-second part; 253-through hole; 26-first adapter; 27-third insulating member; 28-second electrode terminal; 200-controller; 300-motor; 1000-vehicle; X-thickness direction of the main body; Y-length direction of the main body; Z-width direction of the main body. DETAILED DESCRIPTION

[0081] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0082] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0083] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0084] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0085] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0086] The term "multiple" as used in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple sheets" refers to more than two sheets (including two sheets).

[0087] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0088] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0089] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0090] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0091] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0092] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0093] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0094] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0095] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0096] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0097] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0098] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0099] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used.

[0100] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0101] As an example, the negative electrode active material may adopt the negative electrode active material for the battery known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials and lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0102] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0103] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0104] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0105] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0106] In some embodiments, the electrode assembly is a laminate structure.

[0107] In some embodiments, the battery cell may include a housing, which is used to encapsulate components such as an electrode assembly and an electrolyte.

[0108] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0109] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through an adapter. The electrode terminal may be disposed on the end cap, or may be disposed on the housing.

[0110] In some embodiments, an explosion-proof valve is provided on the housing, and the explosion-proof valve is used to release the internal pressure of the battery cell.

[0111] The development of battery technology must take into account many design factors at the same time, such as energy density, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0112] In some embodiments, a battery cell includes a shell, a first electrode terminal and an electrode assembly, the shell includes a first wall, the first electrode terminal is arranged on the first wall, and the electrode assembly is arranged in the shell. The electrode assembly includes a main body and a first pole ear, the main body is flat, the main body has a first end face facing the first wall, and the first pole ear is arranged on the first end face. When the battery cell is assembled, the first pole ear needs to be bent so that the electrode assembly can be loaded into the shell, and the first pole ear is close to the shell in the thickness direction of the electrode assembly. In order to insulate the first pole ear, the outer surface of the first pole ear is provided with insulating tape, but as the electrolyte is soaked, the insulating tape is easy to fall off, which can easily cause the first pole ear to contact and short-circuit with the shell in the thickness direction of the main body, making the reliability of the battery cell low.

[0113] In view of this, an embodiment of the present application provides a technical solution, in which a battery cell includes a shell, a first electrode terminal and an electrode assembly, the shell includes a first wall, the first electrode terminal is arranged on the first wall, the electrode assembly is arranged in the shell, the electrode assembly includes a main body and a first pole ear, the main body is flat, the main body has a first end face facing the first wall, the first pole ear is arranged on the first end face, the battery cell also includes a first insulating member and a second insulating member arranged in the shell, along the thickness direction of the main body, the first pole ear is located between the first insulating member and the second insulating member, so as to reduce the probability of the first pole ear contacting the shell in the thickness direction of the main body, thereby improving the reliability of the battery cell.

[0114] In such a battery cell, since the first pole ear is located between the first insulating member and the second insulating member along the thickness direction of the main body, the orthographic projection of the first pole ear in the thickness direction of the main body at least partially overlaps with the orthographic projection of the first insulating member in the thickness direction of the main body, and the orthographic projection of the first pole ear in the thickness direction of the main body at least partially overlaps with the orthographic projection of the second insulating member in the thickness direction of the main body. The first insulating member and the second insulating member can insulate and isolate the first pole ear from the outer shell in the thickness direction of the main body, reduce the risk of short circuit between the first pole ear and the outer shell, and make the battery cell have higher reliability.

[0115] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft. The battery disclosed in the present application can be used to form a power supply system of the electrical equipment.

[0116] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0117] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in an embodiment of the present application.

[0118] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. Vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0119] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0120] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0121] Please refer to Figure 2 , Figure 2An exploded view of a battery provided for some embodiments of the present application. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is contained in the case 10. Among them, the case 10 is used to provide a storage space for the battery cell 20, and the case 10 can adopt a variety of structures. In some embodiments, the case 10 may include a first sub-case 11 and a second sub-case 12, and the first sub-case 11 and the second sub-case 12 cover each other, and the first sub-case 11 and the second sub-case 12 jointly define a storage space for accommodating the battery cell 20. The second sub-case 12 may be a hollow structure with one end open, and the first sub-case 11 may be a plate-like structure, and the first sub-case 11 covers the open side of the second sub-case 12, so that the first sub-case 11 and the second sub-case 12 jointly define a storage space; the first sub-case 11 and the second sub-case 12 may also be hollow structures with one side open, and the open side of the first sub-case 11 covers the open side of the second sub-case 12.

[0122] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0123] The battery cell 20 may be a secondary battery or a primary battery; the battery cell 20 may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0124] Please refer to Figures 3 to 5 , Figure 3 An exploded view of a battery cell provided in some embodiments of the present application, Figure 4 A cross-sectional view of a battery cell provided in some embodiments of the present application, Figure 5 for Figure 4A partial enlarged view of A. According to some embodiments of the present application, the embodiments of the present application provide a battery cell 20, which includes a shell 21, a first electrode terminal 22, an electrode assembly 23, a first insulating member 24 and a second insulating member 25. The shell 21 includes a first wall 211; the first electrode terminal 22 is insulated and arranged on the first wall 211; the electrode assembly 23 is arranged in the shell 21, and the electrode assembly 23 includes a main body 231 and a first pole ear 232, the main body 231 is flat, and the main body 231 has a first end face 2311 facing the first wall 211, the first pole ear 232 is arranged on the first end face 2311, and the first pole ear 232 is electrically connected to the first electrode terminal 22; the first insulating member 24 and the second insulating member 25 are arranged in the shell 21, and along the thickness direction X of the main body 231, the first pole ear 232 is located between the first insulating member 24 and the second insulating member 25.

[0125] The housing 21 may include a shell 212 and an end cap 213. The shell 212 has an opening to facilitate the electrode assembly 23 to enter the shell 212, and the end cap 213 closes the opening. The first wall 211 may be a wall portion of the shell 212, and the first wall 211 may also be the end cap 213.

[0126] The shell 212 is a component used to cooperate with the end cap 213 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 212 and the end cap 213 can be independent components. The shell 212 can be of various shapes and sizes. Specifically, the shape of the shell 212 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0127] The end cap 213 refers to a component that covers the opening of the shell 212 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 213 can be adapted to the shape of the shell 212 to match the shell 212. Optionally, the end cap 213 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 213 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals can be provided on the end cap 213. The electrode terminal can be used to electrically connect to the electrode assembly 23 for outputting or inputting electrical energy of the battery cell 20. The material of the end cap 213 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose special restrictions on this. In some embodiments, an insulating structure can also be provided on the inner side of the end cap 213, and the insulating structure can be used to isolate the electrical connection components in the shell 212 from the end cap 213 to reduce the risk of short circuit. Exemplarily, the insulating structure may be plastic, rubber, or the like.

[0128] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be included in the housing 212. The electrode assembly 23 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet, and the separator is used to separate the positive electrode sheet and the negative electrode sheet to avoid short circuits between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body 231 of the electrode assembly 23, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear. The positive pole ear and the negative pole ear may be located together at one end of the main body 231 or respectively at both ends of the main body 231. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the pole ears connect the electrode terminals to form a current loop.

[0129] In some embodiments, the first wall 211 is provided with a mounting hole for the first electrode terminal 22 to pass through, and a portion of the first electrode terminal 22 is inserted into the mounting hole to be electrically connected to the first electrode tab 232. A third insulating member 27 is provided between the first electrode terminal 22 and the first wall 211 to insulate and isolate the first electrode terminal 22 and the first wall 211. For example, the third insulating member 27 can be provided on one side of the first wall 211 away from the interior of the battery cell 20 and in the mounting hole.

[0130] The main body 231 is flat, and the outer shell 21 may also be flat to match the shape of the main body 231. The electrode assembly 23 may be a laminated structure or a wound structure.

[0131] In the figure, the direction indicated by the letter X may be the thickness direction X of the main body 231 .

[0132] The first end surface 2311 is a surface of the main body 231 facing the first wall 211, and the first end surface 2311 and the first wall 211 are spaced apart in the thickness direction of the first wall 211. The thickness direction of the first wall 211 may intersect with the thickness direction X of the main body 231.

[0133] The first electrode tab 232 may be directly connected to the first electrode terminal 22 , or may be indirectly connected to the first electrode terminal 22 via a transition piece.

[0134] The first electrode tab 232 is disposed on a first end surface 2311 of the main body 231 facing the first wall 211 , so that the first electrode tab 232 is electrically connected to the first electrode terminal 22 .

[0135] Along the thickness direction X of the main body 231, the first pole ear 232 is located between the first insulating member 24 and the second insulating member 24. The orthographic projection of the first pole ear 232 in the thickness direction X of the main body 231 at least partially overlaps with the orthographic projection of the first insulating member 24 in the thickness direction X of the main body 231, and the orthographic projection of the first pole ear 232 in the thickness direction X of the main body 231 at least partially overlaps with the orthographic projection of the second insulating member 25 in the thickness direction X of the main body 231.

[0136] According to the battery cell 20 of the embodiment of the present application, by arranging the first insulating member 24 and the second insulating member 25 in the outer shell 21, along the thickness direction X of the main body 231, the first pole ear 232 is located between the first insulating member 24 and the second insulating member 25, the orthographic projection of the first pole ear 232 in the thickness direction X of the main body 231 is at least partially overlapped with the orthographic projection of the first insulating member 24 in the thickness direction X of the main body 231, and the orthographic projection of the first pole ear 232 in the thickness direction X of the main body 231 is at least partially overlapped with the orthographic projection of the second insulating member 25 in the thickness direction X of the main body 231. The first insulating member 24 and the second insulating member 25 can insulate and isolate the first pole ear 232 from the outer shell 21 in the thickness direction X of the main body 231, reduce the risk of short circuit caused by contact between the first pole ear 232 and the outer shell 21, and make the battery cell 20 have higher reliability.

[0137] Please refer to Figure 5 According to some embodiments of the present application, the orthographic projection of the first pole tab 232 in the thickness direction X of the main body 231 falls into the orthographic projection of the first insulating member 24 in the thickness direction X of the main body 231, and the orthographic projection of the first pole tab 232 in the thickness direction X of the main body 231 falls into the orthographic projection of the second insulating member 25 in the thickness direction X of the main body 231.

[0138] The orthographic projection of the first pole ear 232 in the thickness direction X of the main body 231 falls into the orthographic projection of the first insulating member 24 in the thickness direction X of the main body 231, that is, along the thickness direction X of the main body 231, observed from the first pole ear 232 toward the first insulating member 24, the first pole ear 232 and the first insulating member 24 have a large overlapping area, the first pole ear 232 can be blocked by the first insulating member 24, and the first insulating member 24 can insulate and isolate the first pole ear 232 from the outer shell 21 in the thickness direction X of the main body 231.

[0139] The orthographic projection of the first pole ear 232 in the thickness direction X of the main body 231 falls into the orthographic projection of the second insulating member 25 in the thickness direction X of the main body 231, that is, along the thickness direction X of the main body 231, observed from the first pole ear 232 toward the second insulating member 25, the first pole ear 232 and the second insulating member 25 have a large overlapping area, the first pole ear 232 can be blocked by the second insulating member 25, and the second insulating member 25 can insulate and isolate the first pole ear 232 from the outer shell 21 in the thickness direction X of the main body 231.

[0140] In the above scheme, the orthographic projection of the first pole ear 232 in the thickness direction X of the main body 231 falls into the orthographic projection of the first insulating member 24 in the thickness direction X of the main body 231, so that the first insulating member 24 and the first pole ear 232 have a larger overlapping area; the orthographic projection of the first pole ear 232 in the thickness direction X of the main body 231 falls into the orthographic projection of the second insulating member 25 in the thickness direction X of the main body 231, so that the second insulating member 25 and the first pole ear 232 have a larger overlapping area, so that the first insulating member 24 and the second insulating member 25 can effectively insulate and isolate the first pole ear 232 from the shell 21.

[0141] According to some embodiments of the present application, the first insulating member 24 is disposed between the first wall 211 and the first end surface 2311 .

[0142] The first insulating member 24 is disposed between the first wall 211 and the first end surface 2311, that is, when viewed along the thickness direction of the first wall 211, the first insulating member 24 at least partially overlaps with the first wall 211, and the first insulating member 24 at least partially overlaps with the first end surface 2311. When the first insulating member 24 is placed on the first end surface 2311, the first insulating member 24 can position the electrode assembly 23.

[0143] Please refer to Figure 5 According to some embodiments of the present application, the first insulating member 24 is in contact with the first wall 211 and the first end surface 2311 respectively.

[0144] The first insulating member 24 is in contact with the first wall 211 and the first end face 2311 respectively. It can be that the two opposite surfaces of the first insulating member 24 in the thickness direction of the first wall 211 are in contact with the first wall 211 and the first end face 2311 respectively. It can be understood that the first insulating member 24 is supported between the first wall 211 and the first end face 2311.

[0145] In some embodiments, the first insulating member 24 has a certain strength. When the electrode assembly 23 moves toward the first wall 211, the first insulating member 24 can limit the electrode assembly 23 to reduce the risk of the electrode assembly 23 contacting the first wall 211 and causing a short circuit between the positive and negative electrodes.

[0146] In the above solution, the first insulating member 24 contacts the first wall 211 and the first end surface 2311 respectively, and the first insulating member 24 can position the electrode assembly 23 and restrict the electrode assembly 23 from moving toward the first wall 211 .

[0147] Please refer to Figure 3 and Figure 5 According to some embodiments of the present application, the first insulating member 24 includes a main body 241 and a protrusion 242. Along the thickness direction X of the main body 231, the first pole ear 232 is located between the main body 241 and the second insulating member 25. The main body 241 has a first surface 241a facing the second insulating member 25, and the protrusion 242 is connected to the main body 241 and protrudes from the first surface 241a.

[0148] The first pole tab 232 is located between the body 241 and the second insulating member 25 along the thickness direction X of the main body 231 . When viewed along the thickness direction X of the main body 231 , the first pole tab 232 and the body 241 have a large overlapping area, and the body 241 can shield the first pole tab 232 .

[0149] The first surface 241a is a surface of the body 241 in the thickness direction X of the main body 231, and the first surface 241a intersects with the thickness direction X of the main body 231. The body 241 may also have a second surface 241b, which is disposed away from the second insulating member 25, and the second surface 241b and the first surface 241a are located at two ends of the body 241 along the thickness direction X of the main body 231.

[0150] The protrusion 242 protrudes from the first surface 241 a, and the protrusion 242 protrudes toward the second insulating member 25 in the thickness direction X of the main body 231 . In some embodiments, one end of the protrusion 242 away from the first surface 241 a may contact the housing 21 .

[0151] The protrusion 242 may be fixed to the body 241 . For example, the protrusion 242 may be integrally formed with the body 241 . Alternatively, the protrusion 242 may be connected to the body 241 by snap-fitting, hot-melt connection, adhesive connection, etc.

[0152] In the above solution, the protrusion 242 protrudes from the first surface 241a, and the size of the body 241 in the thickness direction X of the main body 231 can be small to reduce space occupation; at the same time, the strength of the body 241 can be increased. When the first insulating member 24 contacts the first wall 211 and the first end face 2311 respectively, the provision of the protrusion 242 can increase the contact area between the first insulating member 24 and the first wall 211 and the first end face 2311, so as to have a better positioning effect on the electrode assembly 23.

[0153] In some embodiments, the protrusion 242 extends from one end of the main body 241 in the thickness direction of the first wall 211 to the other end of the main body 241 in the thickness direction of the first wall 211, that is, the two opposite end surfaces of the protrusion 242 in the thickness direction of the first wall 211 are flush with the two opposite end surfaces of the main body 241 in the thickness direction of the first wall 211.

[0154] Please refer to Figure 3 In some embodiments, the protrusion 242 may have a hollow structure 2421 to reduce the weight of the first insulating member 24 .

[0155] Please refer to Figure 3 According to some embodiments of the present application, the first pole ear 232 is located at one end of the length direction Y of the main body 231, the body 241 extends along the width direction Z of the main body 231, the number of the protrusions 242 is multiple, and the multiple protrusions 242 are arranged at intervals along the width direction Z of the main body 231. Along the width direction Z of the main body 231, the first pole ear 232 is located between two adjacent protrusions 242.

[0156] The first pole tab 232 is located at a first end surface 2311 of the main body 231 facing the first wall 211 . The first pole tab 232 is located at one end of the main body 231 in the length direction Y. That is, the first end surface 2311 is an end surface of the main body 231 in the length direction Y.

[0157] The length direction Y of the main body 231 may be parallel to the thickness direction of the first wall 211. The length direction Y of the main body 231 may be parallel to the length direction of the battery cell 20. In this case, the first electrode terminal 22 may be located at one end of the length direction of the battery cell 20 to facilitate electrical connection with other components.

[0158] The body 241 extends along the width direction Z of the main body portion 231 , and the length direction of the body 241 may be parallel to the width direction Z of the main body portion 231 .

[0159] The plurality of protrusions 242 are arranged at intervals along the width direction Z of the main body 231 , that is, the plurality of protrusions 242 are arranged at intervals in the extension direction of the body 241 to reasonably utilize the space in the extension direction of the body 241 .

[0160] Along the width direction Z of the main body 231 , the first pole ear 232 is located between two adjacent protrusions 242 . When viewed along the width direction Z of the main body 231 , the first pole ear 232 at least partially overlaps with the corresponding protrusion 242 . The protrusion 242 can shield the first pole ear 232 in the width direction Z of the main body 231 .

[0161] In the above scheme, the first pole ear 232 is located between two adjacent protrusions 242, and can have a larger overlapping area with the first pole ear 232 in the width direction Z of the main body 231, so as to form an insulating isolation for the first pole ear 232 in the width direction Z of the main body 231, thereby reducing the probability of the first pole ear 232 contacting the outer shell 21; the number of protrusions 242 is multiple, which can increase the strength of the main body 241; when the first insulating member 24 is used to position the electrode assembly 23, the number of protrusions 242 is multiple, which can increase the positioning of the electrode assembly 23 at multiple positions.

[0162] In some embodiments, the number of the protrusions 242 may be two, and along the width direction Z of the main body 231, the first pole tab 232 is located between two adjacent protrusions 242. The two protrusions 242 are disposed at both ends of the body 241 along the width direction Z of the main body 231. For example, the size of the body 241 in the width direction Z of the main body 231 may be smaller, and the protrusion 242 may be disposed adjacent to the first pole tab 232 to reduce the material and weight of the first insulating member 24.

[0163] According to some embodiments of the present application, along the width direction Z of the main body 231 , the orthographic projection of the first electrode tab 232 falls within the orthographic projection of the protrusion 242 .

[0164] In the above scheme, the orthographic projection of the first pole ear 232 falls into the orthographic projection of the protrusion 242. On the one hand, it can increase the insulation effect of the protrusion 242 on the first pole ear 232. On the other hand, the protrusion 242 can have a larger overlapping area with the electrode assembly 23 to have a better positioning effect on the electrode assembly 23.

[0165] According to some embodiments of the present application, the body 241 , two adjacent protrusions 242 , and the second insulating member 25 define an accommodation space for accommodating the first electrode tab 232 .

[0166] The accommodation space can be surrounded by the body 241, two adjacent protrusions 242 and the second insulating member 25, and the first pole tab 232 can be surrounded by the body 241, two adjacent protrusions 242 and the second insulating member 25. In the width direction Z of the body 231, the first pole tab 232 can be shielded by the two protrusions 242; in the thickness direction X of the body 231, the first pole tab 232 can be shielded by the body 241 and the second insulating member 25.

[0167] In the above solution, the first pole tab 232 is accommodated in the accommodation space, which has a good insulation effect on the first pole tab 232 and reduces the probability of the first pole tab 232 contacting the housing 21 .

[0168] Please refer to Figure 6 , Figure 6 Exploded diagram of a battery cell provided for some other embodiments of the present application. According to some embodiments of the present application, the electrode assembly 23 further includes a second pole lug 233 having a polarity opposite to that of the first pole lug 232, the second pole lug 233 and the first pole lug 232 are located at the same end of the length direction Y of the main body 231, and along the width direction Z of the main body 231, the second pole lug 233 is located between two adjacent protrusions 242.

[0169] The first electrode tab 232 may be a positive electrode tab, and the second electrode tab 233 may be a negative electrode tab.

[0170] The second pole tab 233 and the first pole tab 232 are located at the same end of the length direction Y of the main body 231, and the second pole tab 233 and the first pole tab 232 may be spaced apart along the width direction Z of the main body 231. For example, the second pole tab 233 and the first pole tab 232 may be located at both ends of the width direction Z of the main body 231, so that the second pole tab 233 and the first pole tab 232 have a larger spacing in the width direction Z of the main body 231.

[0171] Along the width direction Z of the main body 231, the second pole ear 233 is located between two adjacent protrusions 242, and the orthographic projections of the two protrusions 242 can at least partially overlap with the second pole ear 233, thereby shielding the second pole ear 233 in the width direction Z of the main body 231, limiting the movement of the second pole ear 233, and reducing the probability of the second pole ear 233 contacting the outer shell 21.

[0172] In the above scheme, the second pole ear 233 and the first pole ear 232 are located at the same end of the length direction Y of the main body 231, which is convenient for the extraction of electric energy from the electrode assembly 23 and the assembly of the electrode assembly 23 and the outer shell 21; the second pole ear 233 is located between two adjacent protrusions 242, and the first insulating member 24 has a larger size in the width direction Z of the main body 231. When observed along the length direction Y of the main body 231, the first insulating member 24 and the electrode assembly 23 have a larger overlapping area in the width direction Z of the main body 231, so as to have a better positioning effect on the electrode assembly 23.

[0173] Please refer to Figure 6 , and further refer to Figure 7 , Figure 7 A schematic diagram of the structure of the first insulating member provided for some embodiments of the present application. According to some embodiments of the present application, the plurality of protrusions 242 include a first protrusion 242a, a second protrusion 242b and a third protrusion 242c, along the width direction Z of the main body 231, the first protrusion 242a and the second protrusion 242b are respectively located at opposite ends of the main body 241, the third protrusion 242c is located between the first protrusion 242a and the second protrusion 242b, the first pole lug 232 is located between the first protrusion 242a and the third protrusion 242c, and the second pole lug 233 is located between the second protrusion 242b and the third protrusion 242c.

[0174] The first protruding portion 242 a , the third protruding portion 242 c , and the second protruding portion 242 b are sequentially distributed along the width direction Z of the main body portion 231 .

[0175] In the above scheme, the first pole tab 232 is located between the first protrusion 242a and the third protrusion 242c, and the second pole tab 233 is located between the second protrusion 242b and the third protrusion 242c, so that the first pole tab 232 and the second pole tab 233 can be insulated and isolated in the width direction Z of the main body 231, thereby reducing the probability of the first pole tab 232 and the second pole tab 233 contacting the housing 21. When the first insulating member 24 contacts the first wall 211 and the first end face 2311 respectively, the first protrusion 242a and the second protrusion 242b are located at both ends of the main body 241 along the width direction Z of the main body 231, and the third protrusion 242c is located between the first protrusion 242a and the second protrusion 242b, so that the first insulating member 24 can stabilize the positioning of the electrode assembly 23 and limit the movement of the electrode assembly 23 toward the first wall 211.

[0176] Please refer to Figure 6According to some embodiments of the present application, the first wall 211 is provided with a liquid injection hole 2111, and the third protrusion 242c is provided with a gap avoidance portion 243, and along the length direction Y of the main body 231, the gap avoidance portion 243 at least partially overlaps with the liquid injection hole 2111.

[0177] The injection hole 2111 is used to inject electrolyte into the battery cell 20 . The clearance portion 243 may be a notch formed in the third protruding portion 242 c . The clearance portion 243 penetrates the third protruding portion 242 c along the length direction Y of the main body 231 .

[0178] Along the length direction Y of the main body 231, the avoidance portion 243 may partially overlap with the injection hole 2111, or the avoidance portion 243 may completely overlap with the injection hole 2111, so that when the electrolyte is injected into the battery cell 20 through the injection hole 2111, the electrolyte can pass through the avoidance portion 243 and penetrate the third protrusion 242c, thereby reducing the obstruction of the third protrusion 242c to the electrolyte.

[0179] In the above solution, the provision of the air-avoiding portion 243 can reduce the influence of the first insulating member 24 on the liquid injection, so as to facilitate the electrode assembly 23 to be infiltrated with the electrolyte.

[0180] In some embodiments, the avoiding portion 243 may be formed by hollowing out one third protruding portion 242 c , or the avoiding portion 243 may be formed by a gap between two third protruding portions 242 c .

[0181] According to some embodiments of the present application, when the first wall 211 is provided with a liquid injection hole 2111 , the liquid injection hole 2111 may not overlap with any protrusion 242 along the length direction Y of the main body 231 .

[0182] Please refer to Figure 7 According to some embodiments of the present application, the main body 241 also has a second surface 241b facing away from the second insulating member 25. Along the thickness direction X of the main body 231, the distance between the second surface 241b and the first surface 241a is W0, and the maximum distance between the protrusion 242 and the first surface 241a is W1, satisfying W1>W0.

[0183] The second surface 241b and the first surface 241a are surfaces of the body 241 at both ends of the main body 231 in the thickness direction X. W1 may also be a dimension of the protrusion 242 protruding from the first surface 241a along the thickness direction X of the main body 231.

[0184] In the above solution, the dimension of the protrusion 242 protruding from the first surface 241a is greater than the distance between the second surface 241b and the first surface 241a, so that the dimension of the body 241 in the thickness direction X of the main body 231 can be smaller, which can reduce space occupation.

[0185] Please refer to Figure 5 According to some embodiments of the present application, the wall thickness of the shell 21 is W2, along the thickness direction X of the main body 231, the size of the battery cell 20 is W, and the maximum distance between the protrusion 242 and the second surface 241b is W3, satisfying 2W2≤W-W3≤W / 10.

[0186] W may be a dimension of the battery cell 20 in the thickness direction X of the main body 231 , and may also be referred to as the thickness of the battery cell 20 .

[0187] In the above scheme, the difference between the dimension W of the battery cell 20 in the thickness direction X of the main body 231 and the maximum distance W3 between the protrusion 242 and the second surface 241b satisfies the above relationship (2W2≤W-W3≤W / 10). On the one hand, the assembly interference between the first insulating member 24 and the outer shell 21 can be reduced. On the other hand, the first insulating member 24 can also have a larger dimension in the thickness direction X of the main body 231, which can increase the insulation effect of the first insulating member 24 on the first pole ear 232 in the width direction Z of the main body 231, and also enable the first insulating member 24 and the electrode assembly 23 to have a larger overlapping area, which is convenient for positioning the electrode assembly 23.

[0188] Optionally, W-W3 may be 0.1 mm to 3 mm. For example, W-W3 may be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, etc.

[0189] Please refer to Figure 3 and Figure 5 According to some embodiments of the present application, the second insulating member 25 includes a first part 251 and a second part 252 that are interconnected, and along the thickness direction X of the main body 231, the first pole ear 232 is located between the first part 251 and the first insulating member 24; the first pole ear 232 is located at one end of the length direction Y of the main body 231, and along the length direction Y of the main body 231, the second part 252 is arranged between the first wall 211 and the first pole ear 232.

[0190] The first portion 251 and the second portion 252 may be integrally formed.

[0191] The first portion 251 and the second portion 252 may form an L-shaped structure.

[0192] Along the thickness direction X of the main body 231 , the first electrode tab 232 is located between the first portion 251 and the first insulating member 24 , so that the first portion 251 and the first insulating member 24 insulate and isolate the first electrode tab 232 in the thickness direction X of the main body 231 .

[0193] In the above scheme, the first part 251 can achieve insulation isolation between the first pole ear 232 and the outer shell 21 in the thickness direction X of the main body 231, and the second part 252 can achieve insulation isolation between the first pole ear 232 and the first wall 211 in the length direction Y of the main body 231, which can reduce the risk of short circuit between the first pole ear 232 and the outer shell 21.

[0194] Please refer to Figure 3 and Figure 5 , and further refer to Figure 8 , Figure 8 A schematic diagram of the structure of the second insulating member provided for some embodiments of the present application. According to some embodiments of the present application, the battery cell 20 further includes a first adapter 26, the first adapter 26 is connected to the first pole ear 232, along the length direction Y of the main body 231, the second portion 252 is disposed between the first adapter 26 and the first wall 211, and the first electrode terminal 22 passes through the second portion 252 to be electrically connected to the first adapter 26.

[0195] The first adapter 26 is used to realize the electrical connection between the first electrode tab 232 and the first electrode terminal 22. The first adapter 26 can be connected to the first electrode tab 232 by welding.

[0196] The second portion 252 is provided with a through hole 253 for the first electrode terminal 22 to pass through. A portion of the first electrode terminal 22 is disposed in the through hole 253 to be electrically connected to the first adapter 26 .

[0197] In the above solution, the first adapter 26 realizes the electrical connection between the first electrode tab 232 and the first electrode terminal 22 , so as to facilitate the extraction or import of electrical energy of the electrode assembly 23 .

[0198] According to some embodiments of the present application, along the thickness direction X of the main body 231 , the second portion 252 is in contact with the first insulating member 24 .

[0199] The second portion 252 contacts the first insulating member 24 . The first insulating member 24 is located between the housing 21 and the second portion 252 along the thickness direction X of the main body 231 . The space in the housing 21 along the thickness direction X of the main body 231 can be utilized.

[0200] In the above solution, the second portion 252 is in contact with the first insulating member 24 , which can provide a good insulating effect on the first electrode tab 232 . Meanwhile, the second portion 252 can position the first insulating member 24 .

[0201] According to some embodiments of the present application, the first insulating member 24 includes a body 241 and a protrusion 242, the body 241 includes a first surface 241a facing the second insulating member 25 and a second surface 241b away from the second insulating member 25, the protrusion 242 protrudes from the first surface 241a, and the second part 252 contacts the first surface 241a.

[0202] The first surface 241 a and the second surface 241 b are two surfaces of the body 241 that are opposite to each other in the thickness direction X of the main body 231 . The first surface 241 a and the second surface 241 b are spaced apart from each other in the thickness direction X of the main body 231 .

[0203] The protrusion 242 protrudes from the first surface 241 a along the thickness direction X of the main body 231 .

[0204] An end surface of the second portion 252 in the thickness direction X of the main body 231 is in contact with the first surface 241 a .

[0205] In the above solution, the second portion 252 contacts the first surface 241a to position the first insulating member 24; the body 241, the protrusion 242, the first portion 251 and the second portion 252 insulate the first pole ear 232 from different positions, reducing the risk of the first pole ear 232 contacting the housing 21.

[0206] According to some embodiments of the present application, along the thickness direction X of the main body 231 , the distance between the second surface 241 b and the first surface 241 a is W0 , satisfying 0.05 mm ≤ W0 ≤ 1 mm.

[0207] Optionally, W0 can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, etc.

[0208] In the above scheme, the distance W0 between the second surface 241b and the first surface 241a satisfies the above relationship (0.05mm≤W0≤1mm), the main body 241 occupies a smaller assembly space, and has higher strength itself, and can provide better support effect for the electrode assembly 23.

[0209] According to some embodiments of the present application, 0.2mm≤W0≤0.6mm.

[0210] Optionally, W0 can be 0.2mm, 0.22mm, 0.24mm, 0.26mm, 0.28mm, 0.3mm, 0.32mm, 0.34mm, 0.36mm, 0.38mm, 0.4mm, 0.42mm, 0.44mm, 0.46mm, 0.48mm, 0.5mm, 0.52mm, 0.54mm, 0.56mm, 0.58mm, 0.6mm, etc.

[0211] In the above scheme, compared with W0<0.2mm, when W0≥0.2mm, the size of the main body 241 in the thickness direction X of the main body 231 is larger, and the main body 241 has higher strength and can provide better support for the electrode assembly 23; compared with W0>0.6mm, when W0≤0.6mm, the main body 241 occupies a smaller assembly space.

[0212] Please refer to Figures 9 to 11 , Fig. 9 An exploded view of a battery cell provided in some embodiments of the present application, Fig.10 for Fig. 9 A schematic diagram of the structure of the second insulating member provided on the third wall of FIG. Fig.11 Schematic diagram of the cooperation between the first pole ear and the first insulating member and the second insulating member provided for some embodiments of the present application. According to some embodiments of the present application, the housing 21 further includes a second wall 214 and a third wall 215, the second wall 214 and the third wall 215 are arranged opposite to each other in the thickness direction X of the main body 231, the first insulating member 24 is a first insulating layer arranged on the inner surface of the second wall 214, and the second insulating member 25 is a second insulating layer arranged on the inner surface of the third wall 215.

[0213] One end of the second wall 214 in the length direction Y of the main body 231 and one end of the third wall 215 in the length direction Y of the main body 231 are respectively connected to the first wall 211 .

[0214] The inner surface of the second wall 214 refers to the surface of the second wall 214 used to enclose the inner space of the outer shell 21, and the inner surface of the second wall 214 faces the electrode assembly 23. The inner surface of the third wall 215 refers to the surface of the third wall 215 used to enclose the inner space of the outer shell 21, and the inner surface of the third wall 215 faces the electrode assembly 23.

[0215] The first insulating member 24 may be bonded to the inner surface of the second wall 214, or the first insulating member 24 may be coated on the inner surface of the second wall 214. The second insulating member 25 may be bonded to the inner surface of the third wall 215, or the second insulating member 25 may be coated on the inner surface of the third wall 215.

[0216] In the above solution, the first insulating member 24 is a first insulating layer disposed on the inner surface of the second wall 214 , and the second insulating member 25 is a second insulating layer disposed on the inner surface of the third wall 215 , which has a simple structure and is easy to manufacture.

[0217] According to some embodiments of the present application, the first insulating layer is bonded and fixed to the second wall 214 , and the second insulating layer is bonded and fixed to the third wall 215 .

[0218] The first insulating member 24 may be adhesive tape, an insulating sheet, an insulating block, etc. Similarly, the second insulating member 25 may be adhesive tape, an insulating sheet, an insulating block, etc.

[0219] In the above solution, the first insulating layer is bonded and fixed to the second wall 214 , and the second insulating layer is bonded and fixed to the third wall 215 , which is simple to operate and has low difficulty in processing and manufacturing.

[0220] Please refer to Fig.12 and Fig.13 , Fig.12 An exploded view of a battery cell provided in some embodiments of the present application, Fig.13 for Fig.12 According to some embodiments of the present application, the housing 21 further includes a second wall 214 and a third wall 215, the second wall 214 and the third wall 215 are arranged opposite to each other in the thickness direction X of the main body 231, the first insulating member 24 is a first insulating coating applied to the inner surface of the second wall 214, and the second insulating member 25 is a second insulating coating applied to the inner surface of the third wall 215.

[0221] The second wall 214 and the third wall 215 are respectively connected to the first wall 211 at the same end in the longitudinal direction Y of the main body 231 .

[0222] The inner surface of the second wall 214 may be the surface of the second wall 214 facing the third wall 215, the inner surface of the third wall 215 may be the surface of the third wall 215 facing the second wall 214, and the inner surface of the second wall 214 and the inner surface of the third wall 215 are surfaces constituting the internal space of the outer shell 21.

[0223] The coverage area of ​​the first insulating coating on the inner surface of the second wall 214 may be located between the first wall 211 and the first end surface 2311 along the length direction Y of the main body 231 , or may cover the entire inner surface of the second wall 214 .

[0224] The coverage area of ​​the second insulating coating on the inner surface of the third wall 215 may be located between the first wall 211 and the first end surface 2311 along the length direction Y of the main body 231 , or may cover the entire inner surface of the third wall 215 .

[0225] In the above solution, the first insulating member 24 is a first insulating coating coated on the inner surface of the second wall 214, and the second insulating member 25 is a second insulating coating coated on the inner surface of the third wall 215, which is easy to operate and has low processing difficulty.

[0226] According to some embodiments of the present application, the first insulating coating and the second insulating coating both include at least one of polyester resin, polyurethane, and epoxy resin.

[0227] In the above scheme, at least one of polyester resin, polyurethane and epoxy resin is used, which has a better insulation effect.

[0228] Please refer to Fig.14 , Fig.14 Schematic diagram of assembly of the second wall and the first insulating member provided in some embodiments of the present application. According to some embodiments of the present application, the thickness of the first insulating coating and the thickness of the second insulating coating are both M, satisfying 0.005 mm ≤ M ≤ 0.2 mm.

[0229] The thickness of the first insulating coating layer may be the same as that of the second insulating coating layer to facilitate processing and manufacturing.

[0230] In the above solution, the thickness of the first insulating coating and the thickness of the second insulating coating satisfy the above relationship (0.005mm≤M≤0.2mm), which has a good insulating effect, saves materials, and occupies less space.

[0231] Optionally, M can be 0.005mm, 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, etc.

[0232] According to some embodiments of the present application, 0.01 mm≤M≤0.1 mm.

[0233] Optionally, M can be 0.01mm, 0.015mm, 0.02mm, 0.025mm, 0.03mm, 0.035mm, 0.04mm, 0.045mm, 0.05mm, 0.055mm, 0.06mm, 0.065mm, 0.07mm, 0.075mm, 0.08mm, 0.085mm, 0.09mm, 0.095mm, 0.1mm, etc.

[0234] In the above scheme, the thickness of the first insulating coating and the thickness of the second insulating coating satisfy the above relationship (0.01mm≤M≤0.1mm), and less material is used and less space is occupied while having a better insulating effect.

[0235] Please refer to Figure 3 and Figure 6 According to some embodiments of the present application, the housing 21 includes an end cover 213 and a shell 212, the shell 212 includes a bottom wall 2121 and multiple side walls 2122, the multiple side walls 2122 are arranged around the edge of the bottom wall 2121, along the thickness direction X of the main body 231, one end of the multiple side walls 2122 is connected to the bottom wall 2121, the other ends of the multiple side walls 2122 form an opening, and the end cover 213 closes the opening; the first wall 211 is one of the multiple side walls 2122.

[0236] The bottom wall 2121 and the plurality of side walls 2122 may be integrally formed.

[0237] The end cover 213 and the bottom wall 2121 are disposed opposite to each other in the thickness direction X of the main body 231 .

[0238] In the embodiment where the housing 21 includes the second wall 214 and the third wall 215 , the end cover 213 may be the second wall 214 , and the bottom wall 2121 may be the third wall 215 .

[0239] In the above solution, the first wall 211 is a side wall 2122 , which facilitates the electrical connection between the first electrode terminal 22 and external components.

[0240] According to some embodiments of the present application, the area of ​​the outer surface of the bottom wall 2121 is greater than the area of ​​the outer surface of any one of the side walls 2122 .

[0241] In the above solution, the bottom wall 2121 and the end cover 213 may be large surfaces (walls with larger areas) of the battery cell 20 , so that multiple battery cells 20 can be stacked in a direction perpendicular to the bottom wall 2121 to reduce space occupation.

[0242] According to some embodiments of the present application, the first pole tab 232 is disposed on the first end surface 2311, the first pole tab 232 is electrically connected to the first electrode terminal 22 disposed on the first wall 211, and the first pole tab 232 is a bent structure. Along the thickness direction of the first wall 211, the space between the first wall 211 and the first end surface 2311 is used to accommodate the bent first pole tab 232. The thickness direction of the first wall 211 is parallel to the length direction Y of the main body 231. Along the length direction Y of the main body 231, the distance between the first wall 211 and the first end surface 2311 is H, which satisfies 0.5mm≤H≤7mm, so as to accommodate the bent first pole tab 232 and occupy a smaller space in the length direction Y of the main body 231.

[0243] Optionally, H can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, etc.

[0244] Optionally, 1mm≤H≤4mm.

[0245] Please refer to Figure 3 and Figure 6 According to some embodiments of the present application, the electrode assembly 23 also includes a second pole ear 233 having a polarity opposite to that of the first pole ear 232 , the second pole ear 233 and the first pole ear 232 are located at the same end of the length direction Y of the main body 231 , and the second pole ear 233 is electrically connected to the first wall 211 .

[0246] Optionally, the second electrode tab 233 may be a negative electrode tab, and the first electrode tab 232 may be a positive electrode tab.

[0247] In the above solution, the second electrode tab 233 is electrically connected to the first wall 211 , which can reduce components and reduce costs.

[0248] Please refer to Fig. 9 and Fig.11 According to some embodiments of the present application, the electrode assembly 23 also includes a second pole ear 233 having a polarity opposite to that of the first pole ear 232. The second pole ear 233 and the first pole ear 232 are located at the same end of the length direction Y of the main body 231. Along the thickness direction X of the main body 231, the second pole ear 233 is located between the first insulating member 24 and the second insulating member 25. The battery cell 20 also includes a second electrode terminal 28, which is insulated and disposed on the first wall 211, and the second electrode terminal 28 is electrically connected to the second pole ear 233.

[0249] According to some embodiments of the present application, the embodiments of the present application further provide a battery 100, which includes a battery cell 20 provided in any of the above embodiments.

[0250] According to some embodiments of the present application, an electric device is further provided. The electric device includes a battery cell 20 or a battery 100 as provided in any of the above embodiments. The battery cell 20 or the battery 100 is used to provide electric energy.

[0251] Please refer to Figures 3 to 13 According to some embodiments of the present application, the embodiments of the present application provide a battery cell 20 , which includes a housing 21 , a first electrode terminal 22 , an electrode assembly 23 , a first insulating member 24 and a second insulating member 25 .

[0252] The housing 21 includes a first wall 211 , and the first electrode terminal 22 is insulated and disposed on the first wall 211 .

[0253] The electrode assembly 23 is arranged in the outer shell 21, and the electrode assembly 23 includes a main body 231, a first pole ear 232 and a second pole ear 233. The main body 231 is flat, and the main body 231 has a first end surface 2311 facing the first wall 211. The first pole ear 232 is a positive pole ear, and the second pole ear 233 is a negative pole ear. The first pole ear 232 and the second pole ear 233 are arranged on the first end surface 2311, and the first pole ear 232 is electrically connected to the first electrode terminal 22.

[0254] The housing 21 includes an end cap 213 and a shell 212. The shell 212 includes a bottom wall 2121 and a plurality of side walls 2122. The plurality of side walls 2122 are arranged around the edge of the bottom wall 2121. Along the thickness direction X of the main body 231, one end of the plurality of side walls 2122 is connected to the bottom wall 2121, and the other end of the plurality of side walls 2122 forms an opening, which is closed by the end cap 213. The end cap 213 is the second wall 214, and the bottom wall 2121 is the third wall 215.

[0255] The first insulating member 24 and the second insulating member 25 are disposed in the housing 21, and the first pole tab 232 is located between the first insulating member 24 and the second insulating member 25 along the thickness direction X of the main body 231. The orthographic projection of the first pole tab 232 in the thickness direction X of the main body 231 falls within the orthographic projection of the first insulating member 24 in the thickness direction X of the main body 231, and the orthographic projection of the first pole tab 232 in the thickness direction X of the main body 231 falls within the orthographic projection of the second insulating member 25 in the thickness direction X of the main body 231.

[0256] In some embodiments, the first insulating member 24 is disposed between the first wall 211 and the first end surface 2311, and the first insulating member 24 is in contact with the first wall 211 and the first end surface 2311 respectively. The first insulating member 24 includes a body 241 and a protrusion 242. Along the thickness direction X of the main body 231, the first pole tab 232 is located between the body 241 and the second insulating member 25. The body 241 has a first surface 241a facing the second insulating member 25. The protrusion 242 is connected to the body 241 and protrudes from the first surface 241a. The first pole tab 232 is located at one end of the length direction Y of the main body 231. The body 241 extends along the width direction Z of the main body 231. The number of the protrusions 242 is multiple, and the multiple protrusions 242 are arranged at intervals along the width direction Z of the main body 231. Along the width direction Z of the main body 231, the first pole tab 232 is located between two adjacent protrusions 242. Along the width direction Z of the main body 231, the orthographic projection of the first pole tab 232 falls into the orthographic projection of the protrusion 242. The second insulating member 25 includes a first portion 251 and a second portion 252 connected to each other. Along the thickness direction X of the main body 231, the first pole tab 232 is located between the first portion 251 and the first insulating member 24. Along the length direction Y of the main body 231, the second portion 252 is disposed between the first wall 211 and the first pole tab 232. The second portion 252 contacts the first surface 241a.

[0257] In some embodiments, the first insulating member 24 is a first insulating layer disposed on the inner surface of the end cap 213, and the first insulating layer is bonded and fixed to the end cap 213; the second insulating member 25 is a second insulating layer disposed on the inner surface of the bottom wall 2121, and the second insulating layer is bonded and fixed to the bottom wall 2121. The first insulating member 24 and the second insulating member 25 may be insulating patches.

[0258] In some embodiments, the first insulating member 24 is a first insulating coating applied to the inner surface of the end cap 213, and the second insulating member 25 is a second insulating coating applied to the inner surface of the bottom wall 2121. The first insulating coating and the second insulating coating both include at least one of polyester resin, polyurethane, and epoxy resin.

[0259] In some embodiments, the second electrode tab 233 is electrically connected to the first wall 211 .

[0260] In some embodiments, the battery cell 20 further includes a second electrode terminal, which is insulated and disposed on the first wall 211 , and is electrically connected to the second electrode tab 233 .

[0261] According to the battery cell 20 of the embodiment of the present application, by arranging the first insulating member 24 and the second insulating member 25 in the outer shell 21, the orthographic projection of the first pole ear 232 in the thickness direction X of the main body 231 falls into the orthographic projection of the first insulating member 24 in the thickness direction X of the main body 231, and the orthographic projection of the first pole ear 232 in the thickness direction X of the main body 231 falls into the orthographic projection of the second insulating member 25 in the thickness direction X of the main body 231. The first insulating member 24 and the second insulating member 25 can insulate and isolate the first pole ear 232 from the outer shell 21 in the thickness direction X of the main body 231, reduce the risk of short circuit caused by contact between the first pole ear 232 and the outer shell 21, and make the battery cell 20 have higher reliability.

[0262] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. 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 in that: include: a housing including a first wall; A first electrode terminal, insulated and disposed on the first wall; an electrode assembly, disposed in the housing, the electrode assembly comprising a main body and a first electrode tab, the main body being flat, the main body having a first end surface facing the first wall, the first electrode tab being disposed on the first end surface, and the first electrode tab being electrically connected to the first electrode terminal; The first insulating member and the second insulating member are arranged in the shell, and along the thickness direction of the main body, the first electrode tab is located between the first insulating member and the second insulating member.

2. The battery cell according to claim 1, characterized in that: The orthographic projection of the first pole tab in the thickness direction of the main body falls within the orthographic projection of the first insulating member in the thickness direction of the main body, and the orthographic projection of the first pole tab in the thickness direction of the main body falls within the orthographic projection of the second insulating member in the thickness direction of the main body.

3. The battery cell according to claim 1, characterized in that: The first insulating member is disposed between the first wall and the first end surface.

4. The battery cell according to claim 3, characterized in that: The first insulating member contacts the first wall and the first end surface, respectively.

5. The battery cell according to claim 1, characterized in that: The first insulating member includes a body and a protruding portion. Along the thickness direction of the main body, the first pole ear is located between the body and the second insulating member. The body has a first surface facing the second insulating member. The protruding portion is connected to the body and protrudes from the first surface.

6. The battery cell according to claim 5, characterized in that: The first pole ear is located at one end of the main body in the length direction, the main body extends along the width direction of the main body, the number of the protrusions is multiple, and the multiple protrusions are arranged at intervals along the width direction of the main body. Along the width direction of the main body, the first pole ear is located between two adjacent protrusions.

7. The battery cell according to claim 6, characterized in that: Along the width direction of the main body, the orthographic projection of the first electrode tab falls within the orthographic projection of the protruding portion.

8. The battery cell according to claim 6, characterized in that: The body, the two adjacent protrusions and the second insulating member define an accommodation space for accommodating the first electrode tab.

9. The battery cell according to claim 6, characterized in that: The electrode assembly also includes a second electrode tab having a polarity opposite to that of the first electrode tab. The second electrode tab and the first electrode tab are located at the same end in the length direction of the main body and between two adjacent protrusions along the width direction of the main body.

10. The battery cell according to claim 9, characterized in that: The plurality of protrusions include a first protrusion, a second protrusion and a third protrusion. Along the width direction of the main body, the first protrusion and the second protrusion are respectively located at opposite ends of the main body, the third protrusion is located between the first protrusion and the second protrusion, the first pole ear is located between the first protrusion and the third protrusion, and the second pole ear is located between the second protrusion and the third protrusion.

11. The battery cell according to claim 10, characterized in that: The first wall is provided with a liquid injection hole, and the third protruding portion is provided with a gap-avoiding portion. Along the length direction of the main body, the gap-avoiding portion at least partially overlaps with the liquid injection hole.

12. The battery cell according to claim 5, characterized in that: The body further has a second surface facing away from the second insulating member. Along the thickness direction of the main body, the distance between the second surface and the first surface is W0, and the maximum distance between the protrusion and the first surface is W1, satisfying W1>W0.

13. The battery cell according to claim 12, characterized in that: The wall thickness of the housing is W2, the size of the battery cell along the thickness direction of the main body is W, and the maximum distance between the protrusion and the second surface is W3, satisfying 2W2≤W-W3≤W / 10.

14. The battery cell according to claim 1, characterized in that: The second insulating member includes a first part and a second part connected to each other, and along the thickness direction of the main body, the first pole ear is located between the first part and the first insulating member; the first pole ear is located at one end of the main body in the length direction, and along the length direction of the main body, the second part is arranged between the first wall and the first pole ear.

15. The battery cell according to claim 14, characterized in that: The battery cell also includes a first adapter connected to the first pole ear. Along the length direction of the main body, the second part is arranged between the first adapter and the first wall. The first electrode terminal passes through the second part to be electrically connected to the first adapter.

16. The battery cell according to claim 14, characterized in that: The second portion is in contact with the first insulating member along a thickness direction of the main body.

17. The battery cell according to claim 16, characterized in that: The first insulating member includes a body and a protruding portion, the body includes a first surface facing the second insulating member and a second surface away from the second insulating member, the protruding portion protrudes from the first surface, and the second portion contacts the first surface.

18. The battery cell according to claim 17, characterized in that: Along the thickness direction of the main body, the distance between the second surface and the first surface is W0, satisfying 0.05mm≤W0≤1mm.

19. The battery cell according to claim 18, characterized in that: 0.2mm≤W0≤0.6mm.

20. The battery cell according to claim 1, characterized in that The shell also includes a second wall and a third wall, the second wall and the third wall are arranged opposite to each other in the thickness direction of the main body, the first insulating member is a first insulating layer arranged on the inner surface of the second wall, and the second insulating member is a second insulating layer arranged on the inner surface of the third wall.

21. The battery cell according to claim 20, characterized in that: The first insulating layer is bonded and fixed to the second wall, and the second insulating layer is bonded and fixed to the third wall.

22. The battery cell according to claim 1, characterized in that: The shell also includes a second wall and a third wall, the second wall and the third wall are arranged opposite to each other in the thickness direction of the main body, the first insulating member is a first insulating coating coated on the inner surface of the second wall, and the second insulating member is a second insulating coating coated on the inner surface of the third wall.

23. The battery cell according to claim 22, characterized in that: The first insulating coating and the second insulating coating both include at least one of polyester resin, polyurethane, and epoxy resin.

24. The battery cell according to claim 22, characterized in that: The thickness of the first insulating coating layer and the thickness of the second insulating coating layer are both M, satisfying 0.005 mm ≤ M ≤ 0.2 mm.

25. The battery cell according to claim 24, characterized in that: 0.01mm≤M≤0.1mm.

26. The battery cell according to claim 1, characterized in that: The housing comprises an end cover and a shell, the shell comprises a bottom wall and a plurality of side walls, the plurality of side walls are arranged around the edge of the bottom wall, along the thickness direction of the main body, one end of the plurality of side walls is connected to the bottom wall, the other end of the plurality of side walls forms an opening, and the end cover closes the opening; The first wall is one side wall among the plurality of side walls.

27. The battery cell according to claim 26, characterized in that: The area of ​​the outer surface of the bottom wall is larger than the area of ​​the outer surface of any one of the side walls.

28. The battery cell according to any one of claims 1 to 27, characterized in that: The electrode assembly further includes a second electrode tab having a polarity opposite to that of the first electrode tab, the second electrode tab and the first electrode tab are located at the same end in the length direction of the main body, and the second electrode tab is electrically connected to the first wall.

29. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 28.

30. An electrical equipment, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 28 or a battery according to claim 29, wherein the battery cell or the battery is used to provide electrical energy.

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