Battery cells, battery devices and power-consuming devices

Abstract

The present application provides a battery cell, a battery device and an electrical device. The battery cell includes a housing, an electrode assembly and a protective member. The electrode assembly is a laminated structure and is accommodated in the housing. The electrode assembly includes a first end face and a second end face arranged opposite to each other along a first direction, a first side face along a second direction, and a second side face along a third direction. The first direction, the second direction and the third direction intersect with each other. The first side face is connected between the first end face and the second end face, the second side face is connected between the first end face and the second end face, and the first side face and the second side face are connected. The intersection of the first end face, the second end face, the first side face and the second side face forms a corner. The protective member is arranged between the electrode assembly and the housing. The protective member is an integrated structure and covers the corner. According to the present application, the reliability of the battery cell can be effectively improved.

Description

Technical Field

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

[0002] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In the development of battery technology, the reliability of battery cells will directly affect the reliability, cost of use and user experience of terminal products. Therefore, how to effectively improve the reliability of battery cells is a technical issue that needs to be continuously improved in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell, a battery device and an electrical device, which can effectively improve the reliability of the battery cell.

[0005] In the first aspect, an embodiment of the present application provides a battery cell, the battery cell includes a housing, an electrode assembly and a protective member, the electrode assembly is accommodated in the housing, the electrode assembly includes a first end face and a second end face arranged opposite to each other along a first direction, a first side face along a second direction, and a second side face along a third direction, and the first direction, the second direction and the third direction intersect with each other. The first side face is connected between the first end face and the second end face, the second side face is connected between the first end face and the second end face, and the first side face and the second side face are connected, and the intersection of the first end face, the second end face, the first side face and the second side face forms a corner. The protective member is arranged between the electrode assembly and the housing, and the protective member is an integrated structure and covers the corner.

[0006] The protective member of the above technical solution covers the corner and is located between the electrode assembly and the shell, which can separate the corner from the shell and reduce the pressure of the shell on the corner when the electrode assembly shakes in the shell. The protective member can protect the corner of the electrode assembly, thereby reducing the risk of the corner being damaged by the shaking of the electrode assembly in the shell, and can effectively improve the reliability of the battery cell.

[0007] In some embodiments of the first aspect, the protective member includes a first protective portion, a second protective portion, a third protective portion, and a fourth protective portion, and the first protective portion, the second protective portion, the third protective portion, and the fourth protective portion are connected to each other. The first protective portion is attached to the first end surface, the second protective portion is attached to the second end surface, the third protective portion is attached to the first side surface, and the fourth protective portion is attached to the second side surface.

[0008] The above technical solution helps to increase the contact area between the protective member and the electrode assembly, improve the tightness and stability between the protective member and the electrode assembly, and can reduce the occupation of the protective member on the external space of the electrode assembly, thereby helping to improve the energy density of the battery cell.

[0009] In some embodiments of the first aspect, the first protection portion includes a first edge, a second edge, and a third edge, the first edge is connected to the third protection portion, the second edge is connected to the fourth protection portion, one end of the first edge is connected to one end of the second edge, one end of the third edge is connected to the other end of the first edge, and the other end of the third edge is connected to the other end of the second edge. The projection of the first edge along the first direction coincides with the projection of the third protection portion along the first direction, the projection of the second edge along the first direction coincides with the projection of the fourth protection portion along the first direction, and the projection of the third edge along the first direction is located within the projection of the first end surface along the first direction.

[0010] The above technical solution enables the first protecting portion, the third protecting portion and the fourth protecting portion to transition naturally at the connection points, thereby improving the consistency of the protecting member.

[0011] In some embodiments of the first aspect, a projection shape of the third edge along the first direction includes a straight line segment and / or a curved line segment.

[0012] The above technical solution can adjust the structural shape of the first protection part accordingly by flexibly designing the third edge in a targeted manner, thereby meeting the different structures and requirements of the electrode assembly and improving the structural flexibility and applicability of the protection part.

[0013] In some embodiments of the first aspect, the projection shape of the third edge along the first direction is a continuous straight line segment, which has a simple structure and is less difficult to manufacture, thus helping to reduce the cost of the protective member. Alternatively, the projection shape of the third edge along the first direction is a continuous arc segment, which can further expand the designable range of the structural shape of the first protective portion while having a relatively simple structure and less difficulty in manufacture, thereby helping to further improve the design flexibility and applicability of the protective member.

[0014] In some embodiments of the first aspect, the third edge includes a first segment and a second segment connected, and a projection of the first segment along the first direction and a projection of the second segment along the first direction are not collinear.

[0015] The above technical solution can further expand the designable range of the structural shape of the first protection part through the cooperation between the first section and the second section, thereby helping to further improve the design flexibility and applicability of the protection component.

[0016] In some embodiments of the first aspect, the projection shape of the first segment along the first direction and the projection shape of the second segment along the first direction are both straight line segments, so that the processing difficulty of the first segment and the second segment is relatively low, and the structural complexity and manufacturing difficulty can be reduced while expanding the designable range of the structural shape of the first protection portion.

[0017] In some embodiments of the first aspect, one of the projection shape of the first segment along the first direction and the projection shape of the second segment along the first direction is a straight line segment, and the other is an arc segment, which can further enrich the designable range of the structural shape of the first protection portion.

[0018] In some embodiments of the first aspect, the number of the first segment and the number of the second segment are both plural, and the plurality of first segments and the plurality of second segments are alternately connected.

[0019] The above technical solution can further enrich the designable range of the structural shape of the first protection part, thereby further improving the design flexibility and applicability of the protection component.

[0020] In some embodiments of the first aspect, the first protecting portion, the second protecting portion, the third protecting portion and the fourth protecting portion are an integrally formed structure.

[0021] On the one hand, there is no need to connect the first protection part, the second protection part, the third protection part and the fourth protection part through an additional connection process, which simplifies the manufacturing process. At the same time, compared with connecting the first protection part, the second protection part, the third protection part and the fourth protection part through an additional connection process, the protective part with an integrated structure has a higher structural strength.

[0022] In some embodiments of the first aspect, the electrode assembly includes a plurality of pole pieces stacked along a first direction.

[0023] The first protection portion and the second protection portion can also apply a restraining force parallel to the first direction to the electrode assembly to reduce the gap between the plurality of pole pieces at the corner position, thereby reducing the risk of lithium plating.

[0024] In some embodiments of the first aspect, the protective member further includes a transition portion, the transition portion is connected between the third protecting portion and the fourth protecting portion, and the transition portion is an arc-shaped structure bent toward the corner.

[0025] The above technical solution introduces a transition portion, so that the third protection portion and the fourth protection portion have an arc-shaped transition, which can not only reduce the risk of crushing the corners, but also adapt to electrode assemblies of more shapes, thereby improving the applicability of the protective component.

[0026] In some embodiments of the first aspect, the battery cell further includes a connecting member, and the protective member is connected to the electrode assembly through the connecting member.

[0027] The above technical solution can improve the stability of the protective member by introducing a connector, reduce the risk of protection failure caused by misalignment between the protective member and the electrode assembly, and further improve the reliability of the battery cell.

[0028] In some embodiments of the first aspect, a portion of the connector is connected to the first end face and the second end face, and another portion of the connector is connected to a side of the protective member facing away from the electrode assembly, so that the connector fixes the protective member to the electrode assembly in a surrounding manner, which is simple to assemble and has high stability.

[0029] In some embodiments of the first aspect, the protective member is attached to at least one of the electrode assembly and the housing.

[0030] The above technical solution installs and fixes the protective component by attachment, which helps to reduce structural complexity and cost.

[0031] In some embodiments of the first aspect, the battery cell further comprises an insulating film, which is contained in the housing and is used to separate the electrode assembly from the housing. The protective member is disposed between the electrode assembly and the insulating film, so that the insulating film can play a certain protective role on the protective member, reducing the risk of the protective member falling off during the process of the electrode assembly being loaded into the housing. And / or, the protective member is disposed between the insulating film and the housing, which can reduce the interference effect of the protective member on the assembly of the insulating film and the electrode assembly, reduce the difficulty of setting the insulating film, and can not only improve the coating flatness of the insulating film on the surface of the electrode assembly, but also reduce the risk of the protective member damaging the insulating film.

[0032] In some embodiments of the first aspect, the protective member is attached to the insulating film. Fixing the protective member to the insulating film by attachment helps to reduce structural complexity and cost.

[0033] In some embodiments of the first aspect, the electrode assembly includes two first side surfaces facing each other along the second direction and two second side surfaces facing each other along the third direction, and the intersection of the first end surface, the second end surface, the two first side surfaces and the two second side surfaces forms four corners. The battery cell includes four protective members, and the four protective members are arranged one by one corresponding to the four corners.

[0034] The above technical solution can protect the four corners of the electrode assembly and effectively improve the reliability of the battery cell.

[0035] In some embodiments of the first aspect, the electrode assembly is a laminated structure.

[0036] In a second aspect, the present application provides a battery device, which includes a battery cell provided by any embodiment of the first aspect.

[0037] In a third aspect, the present application provides an electrical device, comprising a battery cell provided by any embodiment of the first aspect or a battery device provided by any embodiment of the second aspect, wherein the battery cell or the battery device is used to store or provide electrical energy.

[0038] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0040] Figure 1 A schematic diagram of an exploded structure of a battery cell provided in some embodiments of the present application;

[0041] Figure 2 A schematic diagram of the matching structure of an electrode assembly and a protective member of a battery cell provided in some embodiments of the present application;

[0042] Figure 3 A schematic structural diagram of a protective component of a battery cell provided in some embodiments of the present application;

[0043] Figure 4 A schematic structural diagram of another battery cell protection component provided in some embodiments of the present application;

[0044] Figure 5 A schematic structural diagram of another battery cell protection component provided in some embodiments of the present application;

[0045] Figure 6 A schematic structural diagram of a protective component of a battery cell provided in some embodiments of the present application;

[0046] Figure 7 A schematic structural diagram of another battery cell protection component provided in some embodiments of the present application;

[0047] Figure 8 A schematic structural diagram of another battery cell protection component provided in some embodiments of the present application;

[0048] Fig. 9 A schematic structural diagram of another battery cell protection component provided in some embodiments of the present application;

[0049] Fig.10 A schematic diagram of the matching structure of an electrode assembly, a protective component and a connector of a battery cell provided in some embodiments of the present application.

[0050] The reference numerals in the specific implementation manner are as follows:

[0051] 10. Shell;

[0052] 20. electrode assembly; 21. electrode body; 211. first end surface; 212. second end surface; 213. first side surface; 214. second side surface; 22. pole ear;

[0053] 30. Protective member; 31. First protective portion; 311. First edge; 312. Second edge; 313. Third edge; 3131. First section; 3132. Second section; 32. Second protective portion; 33. Third protective portion; 34. Fourth protective portion;

[0054] 40. Connectors;

[0055] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0056] 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.

[0057] 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 to which this application belongs; 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" and any variations thereof in the specification and claims of this application and the above-mentioned drawings 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.

[0058] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places 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.

[0059] 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.

[0060] 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.

[0061] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0062] The term “plurality” used in this application refers to two or more (including two).

[0063] In the present application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; meanwhile, "vertical" includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0064] In the embodiment of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0065] The battery cells can be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc., which are not limited in the embodiments of the present application.

[0066] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode.

[0067] 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.

[0068] 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.

[0069] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0070] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0071] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0072] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0073] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0074] 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.

[0075] In some embodiments, the electrode assembly is a laminate structure.

[0076] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0077] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0078] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0079] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0080] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0081] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0082] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0083] In some embodiments, the battery cell may include a shell. The shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. In some embodiments, the shell may be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell plays a role in protecting the electrode assembly, and a sealed bag is also included between the shell and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating film or an aluminum-plastic film. When the shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0084] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0085] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided to cover the opening. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0086] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collecting member. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0087] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0088] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0089] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0090] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0091] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0092] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0093] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0094] 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.

[0095] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0096] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0097] In the development of battery technology, the reliability of battery cells will directly affect the reliability, cost of use and user experience of terminal products. In related technologies, after the electrode assembly is installed in the casing, the electrode assembly is prone to a certain degree of shaking, resulting in corner damage, resulting in damage or abnormal electrical performance, which seriously affects the reliability of the battery cell.

[0098] Based on the above considerations, an embodiment of the present application provides a battery cell, which includes a housing, an electrode assembly and a protective member. The electrode assembly is accommodated in the housing, and the electrode assembly includes a first end face and a second end face arranged opposite to each other along a first direction, a first side face along a second direction, and a second side face along a third direction, and the first direction, the second direction and the third direction intersect with each other. The first side face is connected between the first end face and the second end face, the second side face is connected between the first end face and the second end face, and the first side face and the second side face are connected, and the intersection of the first end face, the second end face, the first side face and the second side face forms a corner. The protective member is arranged between the electrode assembly and the housing, and the protective member is an integrated structure and covers the corner.

[0099] The protective member of the above technical solution covers the corner and is located between the electrode assembly and the shell, which can separate the corner from the shell and reduce the pressure of the shell on the corner when the electrode assembly shakes in the shell. The protective member can protect the corner of the electrode assembly, thereby reducing the risk of the corner being damaged by the shaking of the electrode assembly in the shell, and can effectively improve the reliability of the battery cell.

[0100] The battery cell provided in the embodiments of the present application is introduced below with reference to the accompanying drawings. Figure 1 A schematic diagram of an exploded structure of a battery cell provided in some embodiments of the present application, Figure 2 A schematic diagram of the matching structure of an electrode assembly and a protective component of a battery cell provided in some embodiments of the present application.

[0101] Continue to refer Figure 1 to Figure 2 The embodiment of the present application provides a battery cell, the battery cell includes a housing 10, an electrode assembly 20 and a protective member 30, the electrode assembly 20 is accommodated in the housing 10, the electrode assembly 20 includes a first end face 211 and a second end face 212 arranged opposite to each other along a first direction X, a first side face 213 along a second direction Y, and a second side face 214 along a third direction Z, and the first direction X, the second direction Y and the third direction Z intersect each other. The first side face 213 is connected between the first end face 211 and the second end face 212, the second side face 214 is connected between the first end face 211 and the second end face 212, and the first side face 213 and the second side face 214 are connected, and the intersection of the first end face 211, the second end face 212, the first side face 213 and the second side face 214 forms a corner. The protective member 30 is arranged between the electrode assembly 20 and the housing 10, and the protective member 30 is an integrated structure and covers the corner.

[0102] The housing 10 is a component used to form an internal environment of the battery cell. The formed internal environment can be used to accommodate the electrode assembly 20, electrolyte and other components. Optionally, the housing 10 can be made of, but not limited to, metal or non-metal materials. For example, the metal material can be copper, aluminum or stainless steel, etc.; the non-metal material can be polyethylene, polypropylene or polyvinyl chloride, etc.

[0103] In some examples, the housing 10 includes a shell and an end cap, the shell has an opening, and the end cap covers the opening. The shell and the end cap may be independent components, and an opening may be provided in the shell, and the internal environment of the battery cell may be formed by covering the opening with the end cap at the opening. Optionally, the end cap and the shell may be integrated. Specifically, the end cap and the shell may form a common connection surface before other components are put into the shell, and when the interior of the shell needs to be encapsulated, the end cap covers the shell. The shell may be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, and the like. Specifically, the shape of the shell may be determined according to the specific shape and size of the electrode assembly 20. The shell may be made of various materials, for example, the shell may be made of, but not limited to, metal or non-metal materials, for example, metal materials may be copper, aluminum, or stainless steel, and the like; non-metal materials may be polyethylene, polypropylene, or polyvinyl chloride, and the like.

[0104] The end cap refers to a component that covers the opening of the shell to isolate the internal environment of the battery cell from the external environment. Optionally, the shape of the end cap can be adapted to the shape of the shell to match the shell. Optionally, the end cap can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap is not easily deformed when squeezed and collided, so that the battery cell can have a higher structural strength and reliability can also be improved. Functional components such as terminal groups can be arranged on the end cap. The material of the end cap can also be various. For example, the end cap can be but not limited to being made of metal or non-metallic materials. For example, the metal material can be copper, aluminum or stainless steel, etc.; the non-metallic material can be polyethylene, polypropylene or polyvinyl chloride, etc.

[0105] Optionally, the end cap may be detachably connected to the housing, or may be integrally provided on the housing. The end cap may be directly connected to the housing, or may be restricted to the housing by other components. As an example, the connection method between the end cap and the housing may be, but is not limited to, welding, riveting, or bonding.

[0106] The electrode assembly 20 is a component in the battery cell where electrochemical reactions occur. In the embodiment of the present application, the electrode assembly 20 is a laminated structure, and the electrode assembly 20 is mainly formed by stacking positive and negative electrodes along a first direction X, and a separator is usually provided between the positive and negative electrodes. The parts of the positive and negative electrodes with active materials constitute the main body of the electrode assembly 20, and the parts of the positive and negative electrodes without active materials each constitute a tab 22. The positive tab 22 and the negative tab 22 can be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 22 connects the electrode terminals to form a current loop.

[0107] Exemplarily, the intersection of the first end face 211, the second end face 212, the first side face 213 and the second side face 214 forms a corner. It can be understood that the sharp angle formed by the intersection of the first end face 211, the first side face 213 and the second side face 214, the sharp angle formed by the intersection of the second end face 212, the first side face 213 and the second side face 214, and the intersection line formed by the intersection of the first side face 213 and the second side face 214 together constitute the corner.

[0108] The protective member 30 is an integrated structure, which means that the protective member 30 is already in an integrated form before assembly, in other words, the protective member 30 is already in an integrated form before covering the corners. That is, the entire protective member 30 is an integrated structure.

[0109] In some examples, the protective member 30 may be an elastomer, so that the protective member 30 has good elasticity and can recover after deformation, which can further reduce the risk of the corner of the electrode assembly 20 being hit by rigidity.

[0110] Optionally, the protective member 30 may be made of, but is not limited to, polyethylene, polypropylene, polytetrafluoroethylene, polyimide, polyethylene terephthalate, rubber or other materials.

[0111] The protective member 30 may be adapted to the structural shape and size of the corner, and the protective member 30 is buckled with the corner so that the protective member 30 is attached to the first end face 211, the second end face 212, the first side face 213, and the second side face 214 to cover the corner. The protective member 30 may also be a cover structure, and the protective member 30 is connected to at least one of the first end face 211, the second end face 212, the first side face 213, and the second side face 214 and is covered on the corner to cover the corner.

[0112] In some examples, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The first end surface 211 and the second end surface 212 are arranged in parallel, the first side surface 213 is perpendicular to the first end surface 211 and the second end surface 212, the second side surface 214 is perpendicular to the first end surface 211 and the second end surface 212, and the first side surface 213 and the second side surface 214 are perpendicular.

[0113] The protective member 30 of the above technical solution covers the corner and is located between the electrode assembly 20 and the housing 10, which can separate the corner from the housing 10 and reduce the squeezing of the housing 10 on the corner when the electrode assembly 20 shakes in the housing 10. The protective member 30 can protect the corner of the electrode assembly 20, thereby reducing the risk of the corner being damaged due to the shaking of the electrode assembly 20 in the housing 10, and can effectively improve the reliability of the battery cell.

[0114] Figure 3A schematic structural diagram of a protective component for a battery cell provided in some embodiments of the present application.

[0115] Continue to refer Figure 3 In some embodiments, the protection member 30 includes a first protection portion 31, a second protection portion 32, a third protection portion 33 and a fourth protection portion 34, and the first protection portion 31, the second protection portion 32, the third protection portion 33 and the fourth protection portion 34 are connected to each other. The first protection portion 31 is attached to the first end surface 211, the second protection portion 32 is attached to the second end surface 212, the third protection portion 33 is attached to the first side surface 213, and the fourth protection portion 34 is attached to the second side surface 214.

[0116] Exemplarily, the positional relationship among the first protecting portion 31 , the second protecting portion 32 , the third protecting portion 33 and the fourth protecting portion 34 corresponds to the positional relationship among the first end surface 211 , the second end surface 212 , the first side surface 213 and the second side surface 214 .

[0117] The first protection portion 31 and the second protection portion 32 are arranged opposite to each other along the first direction X, the third protection portion 33 is connected between the first protection portion 31 and the second protection portion 32 and is located at one end of the first protection portion 31 and the second protection portion 32 along the second direction Y, the fourth protection portion 34 is connected between the first protection portion 31 and the second protection portion 32 and is located at one end of the first protection portion 31 and the second protection portion 32 along the third direction Z, and the third protection portion 33 and the fourth protection portion 34 are connected.

[0118] The first protection part 31 , the second protection part 32 , the third protection part 33 and the fourth protection part 34 may be directly connected to each other, or they may be indirectly connected to each other through other components.

[0119] In some examples, the first protecting portion 31 , the second protecting portion 32 , the third protecting portion 33 , and the fourth protecting portion 34 may be detachably connected to each other.

[0120] Optionally, the first protection portion 31 , the second protection portion 32 , the third protection portion 33 and the fourth protection portion 34 may be, but are not limited to, a sheet-like structure, a block-like structure or a film-like structure.

[0121] The first protection portion 31 may be directly connected to the first end surface 211, or may be limited to the first end surface 211 by other components. The second protection portion 32 may be directly connected to the second end surface 212, or may be limited to the second end surface 212 by other components. The third protection portion 33 may be directly connected to the first side surface 213, or may be limited to the first side surface 213 by other components. The fourth protection portion 34 may be directly connected to the second side surface 214, or may be limited to the second side surface 214 by other components.

[0122] The above technical solution helps to increase the contact area between the protective member 30 and the electrode assembly 20, improve the tightness and stability between the protective member 30 and the electrode assembly 20, and can reduce the occupation of the external space of the electrode assembly 20 by the protective member 30, thereby helping to improve the energy density of the battery cell.

[0123] In some embodiments, the first protection portion 31 includes a first edge 311, a second edge 312 and a third edge 313, the first edge 311 is connected to the third protection portion 33, the second edge 312 is connected to the fourth protection portion 34, one end of the first edge 311 is connected to one end of the second edge 312, one end of the third edge 313 is connected to the other end of the first edge 311, and the other end of the third edge 313 is connected to the other end of the second edge 312.

[0124] The projection of the first edge 311 along the first direction X coincides with the projection of the third protecting portion 33 along the first direction X, the projection of the second edge 312 along the first direction X coincides with the projection of the fourth protecting portion 34 along the first direction X, and the projection of the third edge 313 along the first direction X is located within the projection of the first end surface 211 along the first direction X.

[0125] Exemplarily, the first edge 311, the second edge 312, and the third edge 313 are connected end to end in sequence to jointly define the structural shape of the first protection portion 31. The projection of the first edge 311 along the first direction X coincides with the projection of the third protection portion 33 along the first direction X, and it can also be understood that the size of the first edge 311 along the third direction Z is the same as the size of the edge of the third protection portion 33 connected to the first protection portion 31 along the third direction Z.

[0126] The projection of the second edge 312 along the first direction X coincides with the projection of the fourth protecting portion 34 along the first direction X. It can also be understood that the size of the second edge 312 along the second direction Y is the same as the size of the edge of the fourth protecting portion 34 connected to the first protecting portion 31 along the second direction Y.

[0127] The above technical solution enables the first protecting portion 31 , the third protecting portion 33 and the fourth protecting portion 34 to transition naturally at the connection points, thereby improving the consistency of the protecting member 30 .

[0128] Figure 4 This is a schematic diagram of the structure of another battery cell protection component provided in some embodiments of the present application. Figure 5 A schematic structural diagram of another battery cell protection component provided in some embodiments of the present application.

[0129] Continue to refer Figures 4 to 5 In some embodiments, the projection shape of the third edge 313 along the first direction X includes a straight line segment and / or a curve segment.

[0130] Exemplarily, the projection shape of the third edge 313 along the first direction X may be a straight line segment, the projection shape of the third edge 313 along the first direction X may also be a curved line segment, or the projection shape of the third edge 313 along the first direction X may also be a combination of a straight line segment and a curved line segment. The straight line segment may be a straight line segment or a combination of a plurality of straight line segments with different extension directions. The curved line segment may be a curved line segment or a combination of a plurality of curved line segments with different extension directions.

[0131] In some examples, the curved line segment includes an arc segment or a wavy line segment.

[0132] It can be understood that the change of the projection shape of the third edge 313 along the first direction X will cause the projection shape of the first protecting portion 31 along the first direction X to change. That is to say, when the first edge 311 and the second edge 312 remain unchanged, the structural shape of the entire first protecting portion 31 can be changed by adjusting the shape of the third edge 313.

[0133] In this way, the above technical solution can adjust the structural shape of the first protection part 31 accordingly by flexibly designing the third edge 313 in a targeted manner, thereby meeting the different structures and requirements of the electrode assembly 20 and improving the structural flexibility and applicability of the protection part 30.

[0134] like Figure 3 As shown, in some embodiments, the projection shape of the third edge 313 along the first direction X is a continuous straight line segment, so that the projection shape of the first protection portion 31 along the first direction X is a triangle. The structure is simple and the preparation difficulty is low, which helps to reduce the cost of the protection member 30.

[0135] like Figure 4 and Figure 5 As shown, in some embodiments, the projection shape of the third edge 313 along the first direction X is a continuous arc segment. While the structure is relatively simple and the manufacturing difficulty is relatively low, the designable range of the structural shape of the first protection portion 31 can be further expanded, thereby helping to further improve the design flexibility and applicability of the protection member 30.

[0136] As an example, Figure 7 As shown, the projection shape of the third edge 313 along the first direction X is a continuous arc segment bent away from the corner. While the structure is relatively simple and the manufacturing difficulty is relatively low, the coverage area of ​​the first protection portion 31 can be increased to improve the stability of the protection member 30 and the binding effect on the electrode assembly 20.

[0137] As another example, Figure 8 As shown, the projection shape of the third edge 313 along the first direction X is a continuous arc segment that bends near the corner. While meeting the protection requirements of the electrode assembly 20, the coverage area of ​​the first protection portion 31 can be further reduced, and the overall preparation consumables of the protection member 30 can be reduced, which helps to further reduce costs.

[0138] Figure 6 A schematic diagram of the structure of a protective component of a battery cell provided in some embodiments of the present application is provided. Figure 7 This is a schematic structural diagram of another battery cell protection component provided in some embodiments of the present application. Figure 8 This is a schematic structural diagram of another battery cell protection component provided in some embodiments of the present application. Fig. 9 A schematic structural diagram of another battery cell protection component provided in some embodiments of the present application.

[0139] Continue to refer Figure 6 and Fig. 9 In some embodiments, the third edge 313 includes a first segment 3131 and a second segment 3132 connected to each other, and the projection of the first segment 3131 along the first direction X and the projection of the second segment 3132 along the first direction X are not collinear. In other words, the extension direction of the first segment 3131 is different from the extension direction of the second segment 3132 .

[0140] Exemplarily, the first edge 311, the second edge 312, the first segment 3131, and the second segment 3132 are sequentially connected end to end to jointly define the structural shape of the first protection portion 31. The first segment 3131 can be a straight segment or a curved segment, and the second segment 3132 can be a straight segment or a curved segment. The number of the first segment 3131 can be one or more, and the number of the second segment 3132 can be one or more.

[0141] In some examples, the projection of the first segment 3131 along the first direction X and the projection of the second segment 3132 along the first direction X are both straight line segments.

[0142] In some other examples, the projection of the first segment 3131 along the first direction X and the projection of the second segment 3132 along the first direction X are both curved segments.

[0143] In some other examples, one of the projection of the first segment 3131 along the first direction X and the projection of the second segment 3132 along the first direction X is a straight line segment, and the other is a curved line segment.

[0144] The above technical solution can further expand the designable range of the structural shape of the first protection portion 31 through the cooperation between the first section 3131 and the second section 3132 , thereby helping to further improve the design flexibility and applicability of the protection member 30 .

[0145] like Figures 6 to 8 As shown, in some embodiments, the projection shape of the first segment 3131 along the first direction X and the projection shape of the second segment 3132 along the first direction X are both straight line segments. This makes the processing difficulty of the first segment 3131 and the second segment 3132 relatively low, and can reduce the structural complexity and manufacturing difficulty while expanding the designable range of the structural shape of the first protection portion 31.

[0146] like Fig. 9 As shown, in some embodiments, one of the projection shapes of the first segment 3131 and the second segment 3132 along the first direction X is a straight line segment, and the other is an arc segment. This can further enrich the design range of the structural shape of the first protection portion 31 .

[0147] In some embodiments, the number of the first segment 3131 and the number of the second segment 3132 are both plural, and the plurality of first segments 3131 and the plurality of second segments 3132 are alternately connected.

[0148] For example, the number of the first segments 3131 may be, but is not limited to, two, three, four or more, and the number of the second segments 3132 may be, but is not limited to, two, three, four or more. As an example, the number of the first segments 3131 and the second segments 3132 are both two, and the two first segments 3131 and the two second segments 3132 are alternately connected so that the first protection portion 31 forms a polygonal structure.

[0149] The above technical solution can further enrich the designable range of the structural shape of the first protection portion 31 , thereby further improving the design flexibility and applicability of the protection member 30 .

[0150] In some embodiments, the second protection portion 32 includes a fourth edge, a fifth edge and a sixth edge, the fourth edge is connected to the third protection portion 33, the fifth edge is connected to the fourth protection portion 34, one end of the fourth edge is connected to one end of the fifth edge, one end of the sixth edge is connected to the other end of the fourth edge, and the other end of the sixth edge is connected to the other end of the fifth edge.

[0151] The projection of the fourth edge along the first direction X coincides with the projection of the third protection portion 33 along the first direction X, the projection of the fifth edge along the first direction X coincides with the projection of the fourth protection portion 34 along the first direction X, and the projection of the sixth edge along the first direction X is located within the projection of the first end surface 211 along the first direction X.

[0152] In some embodiments, a projection shape of the sixth edge along the first direction X includes a straight line segment and / or a curved line segment.

[0153] In some embodiments, a projection shape of the sixth edge along the first direction X is a continuous straight line segment.

[0154] In some embodiments, the projection shape of the sixth edge along the first direction X is a continuous arc segment.

[0155] In some embodiments, the sixth edge includes a third segment and a fourth segment connected to each other, and a projection of the third segment along the first direction X and a projection of the fourth segment along the first direction X are not collinear.

[0156] In some embodiments, a projection shape of the third segment along the first direction X and a projection shape of the fourth segment along the first direction X are both straight line segments.

[0157] In some embodiments, one of the projection shape of the third segment along the first direction X and the projection shape of the fourth segment along the first direction X is a straight line segment, and the other is an arc segment.

[0158] In some embodiments, the number of the third segment and the number of the fourth segment are both plural, and the multiple third segments and the multiple fourth segments are alternately connected.

[0159] It should be noted that the second protection portion 32 may have the same structure as the first protection portion 31. In other words, the projection of the second protection portion 32 along the first direction X coincides with the projection of the first protection portion 31 along the first direction X. For specific structural details of the second protection portion 32, reference may be made to the relevant contents of the first protection portion 31 described above, which will not be repeated here.

[0160] In some embodiments, the third protection portion 33 and the fourth protection portion 34 may have the same structure as the first protection portion 31. In other words, the projection shape of the third protection portion 33 along the second direction Y is the same as the projection shape of the first protection portion 31 along the first direction X, and the projection shape of the fourth protection portion 34 along the third direction Z is the same as the projection shape of the first protection portion 31 along the first direction X.

[0161] In some embodiments, the third protection portion 33 and the fourth protection portion 34 are both rectangular plate structures. In other words, the projection of the third protection portion 33 along the second direction Y is a rectangle, and the projection of the fourth protection portion 34 along the third direction Z is a rectangle.

[0162] In some embodiments, the first protecting portion 31 , the second protecting portion 32 , the third protecting portion 33 and the fourth protecting portion 34 are an integrally formed structure.

[0163] On the one hand, there is no need to connect the first protection part 31, the second protection part 32, the third protection part 33 and the fourth protection part 34 through an additional connection process, which simplifies the manufacturing process. At the same time, compared with connecting the first protection part 31, the second protection part 32, the third protection part 33 and the fourth protection part 34 through an additional connection process, the protective member 30 with an integrated structure has a higher structural strength.

[0164] In some embodiments, the electrode assembly 20 includes a plurality of electrode sheets stacked along the first direction X.

[0165] The first protection portion 31 and the second protection portion 32 can also apply a restraining force parallel to the first direction X to the electrode assembly 20 to reduce the gap between the plurality of pole pieces at the corners of the electrode assembly 20, thereby reducing the risk of lithium plating.

[0166] In some embodiments, the protection member 30 further includes a transition portion, which is connected between the third protection portion 33 and the fourth protection portion 34 , and is an arc-shaped structure that bends toward the corner.

[0167] Exemplarily, the transition portion is an arc-shaped structure that bends toward the corner. It can also be understood that the surface of the transition portion facing the corner is a concave surface that is recessed in a direction away from the corner, and the surface of the transition portion facing away from the corner is a convex surface that is protruding in a direction away from the corner.

[0168] In some examples, the transition portion is an arc structure that bends toward the corner.

[0169] The above technical solution introduces a transition portion to make an arc-shaped transition between the third protection portion 33 and the fourth protection portion 34 , which can not only reduce the risk of crushing the corners, but also adapt to electrode assemblies of more shapes, thereby improving the applicability of the protective member 30 .

[0170] Fig.10 A schematic diagram of the matching structure of an electrode assembly, a protective component and a connector of a battery cell provided in some embodiments of the present application.

[0171] Continue to refer Fig.10 In some embodiments, the battery cell further includes a connector 40 , and the protection member 30 is connected to the electrode assembly 20 via the connector 40 .

[0172] Exemplarily, the connecting member 40 is used to fix the protective member 30 on the electrode assembly 20 , and the connecting member 40 may be but is not limited to adhesive, tape, or binding tape.

[0173] The above technical solution can improve the stability of the protection member 30 by introducing the connecting member 40, reduce the risk of misalignment between the protection member 30 and the electrode assembly 20 causing protection failure, and further improve the reliability of the battery cell.

[0174] In some embodiments, a portion of the connector 40 is connected to the first end surface 211 and the second end surface 212, and another portion of the connector 40 is connected to the side of the protective member 30 facing away from the electrode assembly 20. The connector 40 fixes the protective member 30 on the electrode assembly 20 in a surrounding manner, which is simple to assemble and has high stability.

[0175] In some embodiments, the protector 30 is attached to at least one of the electrode assembly 20 and the housing 10 .

[0176] Exemplarily, attachment refers to adhesion, coating or spraying. The protective member 30 may be attached to the electrode assembly 20, or to the inner wall of the housing 10, or to both the electrode assembly 20 and the inner wall of the housing 10.

[0177] The above technical solution installs and fixes the protective member 30 by attachment, which helps to reduce structural complexity and cost.

[0178] In some embodiments, the protective member 30 is integrally provided with the housing 10 , which can simplify the assembly steps of the battery cell and improve the assembly efficiency.

[0179] The protection member 30 is integrally provided with the housing 10, which means that the protection member 30 is fixed to the housing 10 before the battery cell is assembled. In other words, the protection member 30 is fixed to the housing 10 before the corner is covered. For example, the protection member 30 and the housing 10 may be integrally provided by an integral injection molding process.

[0180] In some embodiments, the battery cell further includes an insulating film, which is accommodated in the housing 10 and is used to separate the electrode assembly 20 from the housing 10 .

[0181] The insulating film is used to insulate the electrode assembly 20 and the housing 10 . In some examples, the insulating film covers at least a portion of the outer surface of the electrode assembly 20 .

[0182] Optionally, the insulating film may be made of, but is not limited to, polyethylene, polypropylene, polyethylene terephthalate, rubber or the like.

[0183] In some embodiments, the protective member 30 is disposed between the electrode assembly 20 and the insulating film, so that the insulating film can provide a certain degree of protection for the protective member 30 , thereby reducing the risk of the protective member 30 falling off when the electrode assembly 20 is installed into the outer shell 10 .

[0184] In some embodiments, the protective member 30 is disposed between the insulating film and the outer shell 10, which can reduce the interference effect of the protective member 30 on the assembly of the insulating film and the electrode assembly 20, reduce the difficulty of setting the insulating film, and not only improve the flatness of the insulating film on the surface of the electrode assembly 20, but also reduce the risk of the protective member 30 damaging the insulating film.

[0185] In some embodiments, the protection member 30 is attached to the insulating film. Fixing the protection member 30 to the insulating film by attachment helps to reduce structural complexity and cost.

[0186] In some embodiments, the protective member 30 is integrally provided with the insulating film, which can simplify the assembly steps of the battery cell and improve the assembly efficiency.

[0187] The protection member 30 is integrally provided with the insulating film, which means that the protection member 30 is fixed on the insulating film before the battery cell is assembled. In other words, the protection member 30 is fixed on the insulating film before the corner is covered. For example, the protection member 30 and the insulating film can be integrally provided by an integral molding process.

[0188] In some embodiments, the electrode assembly 20 includes two first side surfaces 213 facing each other along the second direction Y and two second side surfaces 214 facing each other along the third direction Z. The intersection of the first end surface 211, the second end surface 212, the two first side surfaces 213 and the two second side surfaces 214 forms four corners. The battery cell includes four protective members 30, and the four protective members 30 are arranged one by one corresponding to the four corners.

[0189] The above technical solution can protect the four corners of the electrode assembly 20 and effectively improve the reliability of the battery cell.

[0190] In some examples, the electrode assembly 20 includes a plurality of pole pieces stacked along the first direction X, the pole pieces include a main body and a pole ear 22 connected to each other, and the electrode assembly 20 includes the main body of all pole pieces. The above technical solution can also reduce the gap between the plurality of pole pieces at the four corner positions, thereby effectively reducing the risk of lithium deposition.

[0191] In some embodiments, the electrode assembly 20 is a laminated structure.

[0192] In some embodiments, the electrode assembly 20 includes an electrode body 21 and an electrode tab 22 connected to each other, and the corner is located on the electrode body 21 .

[0193] According to some embodiments of the present application, the present application also provides a battery device, comprising a battery cell of any of the above schemes.

[0194] According to some embodiments of the present application, the present application further provides an electrical device, comprising a battery cell or a battery device according to any of the above schemes, wherein the battery cell or the battery device is used to store or provide electrical energy.

[0195] If not otherwise specified, all implementations and optional implementations of the present application can be combined with each other to form a new technical solution. All technical features and optional technical features of the present application can be combined with each other to form a new technical solution.

[0196] In order to better understand the battery cells provided in the embodiments of the present application, based on the same inventive concept, embodiments of the above-mentioned battery cells in practical applications are provided herein for illustration.

[0197] An embodiment of the present application provides a battery cell, which includes a housing 10, an electrode assembly 20 and four protective members 30. The electrode assembly 20 is a laminated structure and is accommodated in the housing 10. The electrode assembly 20 includes a plurality of electrode sheets stacked along a first direction X.

[0198] The electrode assembly 20 includes a first end face 211 and a second end face 212 opposite to each other along a first direction X, two first side faces 213 opposite to each other along a second direction Y, and two second side faces 214 opposite to each other along a third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The first side face 213 is connected between the first end face 211 and the second end face 212, the second side face 214 is connected between the first end face 211 and the second end face 212, and the first side face 213 and the second side face 214 are connected. The intersection of the first end face 211, the second end face 212, the two second side faces 214, and the two third side faces forms four corners.

[0199] Four protective members 30 are arranged corresponding to the four corners, and the protective members 30 are arranged integrally and located between the electrode assembly 20 and the housing 10, and the protective members 30 cover the corners. The protective member 30 includes a first protective portion 31, a second protective portion 32, a third protective portion 33 and a fourth protective portion 34, and the first protective portion 31, the second protective portion 32, the third protective portion 33 and the fourth protective portion 34 are connected to each other. The first protective portion 31 is attached to the first end surface 211, the second protective portion 32 is attached to the second end surface 212, the third protective portion 33 is attached to the first side surface 213, and the fourth protective portion 34 is attached to the second side surface 214.

[0200] The protective member 30 of the above technical solution covers the corner and is located between the electrode assembly 20 and the housing 10, which can separate the corner from the housing 10 and reduce the squeezing of the corner by the housing 10 when the electrode assembly 20 shakes in the housing 10. The protective member 30 can protect the corner of the electrode assembly 20, thereby reducing the risk of the corner being damaged by the shaking of the electrode assembly 20 in the housing 10, and can effectively improve the reliability of the battery cell. In addition, the gap between the multiple pole pieces at the four corners can also be reduced, thereby effectively reducing the risk of lithium deposition.

[0201] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: shell; an electrode assembly, contained in the housing, the electrode assembly comprising a first end face and a second end face disposed opposite to each other along a first direction, a first side face along a second direction, and a second side face along a third direction, wherein the first direction, the second direction and the third direction intersect each other. The first side surface is connected between the first end surface and the second end surface, the second side surface is connected between the first end surface and the second end surface, and the first side surface and the second side surface are connected, and the intersection of the first end surface, the second end surface, the first side surface and the second side surface forms a corner; A protective member is disposed between the electrode assembly and the housing, wherein the protective member is an integrated structure and covers the corner.

2. The battery cell according to claim 1, characterized in that: The protection member comprises a first protection portion, a second protection portion, a third protection portion and a fourth protection portion, wherein the first protection portion, the second protection portion, the third protection portion and the fourth protection portion are connected to each other; The first protection portion is attached to the first end surface, the second protection portion is attached to the second end surface, the third protection portion is attached to the first side surface, and the fourth protection portion is attached to the second side surface.

3. The battery cell according to claim 2, characterized in that: The first protection portion includes a first edge, a second edge and a third edge, the first edge is connected to the third protection portion, the second edge is connected to the fourth protection portion, one end of the first edge is connected to one end of the second edge, one end of the third edge is connected to the other end of the first edge, and the other end of the third edge is connected to the other end of the second edge; The projection of the first edge along the first direction coincides with the projection of the third protecting portion along the first direction, the projection of the second edge along the first direction coincides with the projection of the fourth protecting portion along the first direction, and the projection of the third edge along the first direction is located within the projection of the first end face along the first direction.

4. The battery cell according to claim 3, characterized in that: A projection shape of the third edge along the first direction includes a straight line segment and / or a curved line segment.

5. The battery cell according to claim 4, characterized in that: The projection shape of the third edge along the first direction is a continuous straight line segment or a continuous arc segment.

6. The battery cell according to claim 4, characterized in that: The third edge includes a first segment and a second segment connected to each other, wherein a projection of the first segment along the first direction and a projection of the second segment along the first direction are not collinear.

7. The battery cell according to claim 6, characterized in that: A projection shape of the first segment along the first direction and a projection shape of the second segment along the first direction are both straight line segments.

8. The battery cell according to claim 6, characterized in that: One of a projection shape of the first segment along the first direction and a projection shape of the second segment along the first direction is a straight line segment, and the other is an arc segment.

9. The battery cell according to claim 6, characterized in that: The number of the first segment and the number of the second segment are both plural, and the plural first segments and the plural second segments are alternately connected.

10. The battery cell according to claim 2, characterized in that: The first protecting portion, the second protecting portion, the third protecting portion and the fourth protecting portion are an integrally formed structure.

11. The battery cell according to claim 2, characterized in that: The electrode assembly includes a plurality of pole pieces stacked along the first direction.

12. The battery cell according to claim 2, characterized in that: The protection member further includes a transition portion, wherein the transition portion is connected between the third protection portion and the fourth protection portion, and the transition portion is an arc-shaped structure bent toward the corner portion.

13. The battery cell according to claim 1, characterized in that: The battery cell further includes a connecting member, and the protection member is connected to the electrode assembly through the connecting member.

14. The battery cell according to claim 13, characterized in that: A portion of the connecting member is connected to the first end surface and the second end surface, and another portion of the connecting member is connected to a side of the protective member facing away from the electrode assembly.

15. The battery cell according to claim 1, characterized in that: The protection member is attached to at least one of the electrode assembly and the housing.

16. The battery cell according to claim 1, characterized in that: The battery cell further includes an insulating film, which is accommodated in the housing and is used to separate the electrode assembly from the housing; The protective member is disposed between the electrode assembly and the insulating film, and / or the protective member is disposed between the insulating film and the housing.

17. The battery cell according to claim 16, characterized in that: The protection member is attached to the insulating film.

18. The battery cell according to claim 1, characterized in that: The electrode assembly comprises two first side surfaces facing each other along the second direction and two second side surfaces facing each other along the third direction, and the intersections of the first end surface, the second end surface, the two first side surfaces and the two second side surfaces form four corners; The battery cell includes four protection members, and the four protection members are arranged in one-to-one correspondence with the four corners.

19. The battery cell according to any one of claims 1 to 18, characterized in that: The electrode assembly is a laminated structure.

20. A battery device, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 19.

21. An electrical device, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 19 or a battery device according to claim 20, wherein the battery cell or the battery device is used for storing or providing electrical energy.

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