Battery monomer, battery device and electric equipment

Abstract

The utility model discloses a battery monomer, a battery device and electric equipment. The battery cell includes a case, an electrode assembly, and an end cap assembly. The housing has an opening. The electrode assembly is housed within the case. The end cover assembly comprises an end cover and an insulating part, the end cover covers the opening, the insulating part is arranged on the side, facing the electrode assembly, of the end cover and comprises an insulating body and a plurality of reinforcing parts arranged at intervals, the side, facing the electrode assembly, of the insulating body is provided with a first concave part, and the reinforcing parts are connected to the bottom wall of the first concave part. At least part of the reinforcing part protrudes out of the bottom face, facing the electrode assembly, of the first concave part. The reinforcing part can play a role of a reinforcing rib, and the deformation resistance of the bottom wall of the first concave part can be improved. Moreover, the plurality of reinforcing parts are arranged at intervals and can play a role in reinforcing different areas of the bottom wall, so that the overall deformation resistance of the bottom wall is improved, the risk of deformation of the insulating part is reduced, and the reliability of the single battery is improved.

Description

TECHNICAL FIELD

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

[0002] Batteries are widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes and electric tools, etc.

[0003] In the development of battery technology, how to improve the reliability of the battery monomer is a research direction in the battery technology. INNOVATION CONTENT

[0004] The present application provides a battery monomer, a battery device and an electric equipment, which are beneficial to improve the reliability of the battery monomer.

[0005] According to a first aspect of the present application, the present application provides a battery monomer, which comprises a shell, an electrode assembly and an end cover assembly. The shell has an opening; the electrode assembly is accommodated in the shell; the end cover assembly comprises an end cover and an insulating piece, the end cover covers the opening, and the insulating piece is arranged on the side of the end cover facing the electrode assembly. The insulating piece comprises an insulating main body and a plurality of reinforcing parts arranged at intervals, the side of the insulating main body facing the electrode assembly is provided with a first recess, the reinforcing parts are connected to the bottom wall of the first recess, and at least part of the reinforcing parts protrude from the bottom surface of the first recess facing the electrode assembly. The reinforcing parts can play the role of reinforcing ribs, and can improve the anti-deformation ability of the bottom wall of the first recess. Moreover, the plurality of reinforcing parts are arranged at intervals, and the plurality of reinforcing parts can play a reinforcing role on different areas of the bottom wall, which is beneficial to improve the anti-deformation ability of the whole bottom wall, reduce the risk of deformation of the insulating piece, and improve the reliability of the battery monomer.

[0006] In some embodiments, the density of the reinforcing parts is greater than the density of the insulating main body. The density of the reinforcing parts is greater, and the structural strength is higher, which is beneficial to improve the structural reinforcing effect of the reinforcing parts on the insulating main body, and further reduce the risk of deformation of the insulating main body.

[0007] In some embodiments, the reinforcing parts protrude from the surface of the insulating main body facing the end cover and are connected to the end cover, the side of the end cover facing the insulating piece is provided with a second recess, and part of the reinforcing parts is accommodated in the second recess. The reinforcing parts are connected to the end cover and the bottom wall of the first recess, which can hinder the deformation of the bottom wall through the connection of the end cover and the reinforcing parts, and can also enhance the connection strength between the insulating piece and the end cover, which is beneficial to further reduce the risk of deformation of the insulating piece.

[0008] In some embodiments, the electrode assembly comprises a main body portion and a tab portion led out from the main body portion, at least part of the tab portion is accommodated in the first recess; the insulating main body comprises two first protrusions arranged at intervals along the first direction, the first recess is located between the two first protrusions along the first direction, the first protrusions protrude from the bottom surface of the first recess, and the first protrusions abut against the main body portion; along the direction in which the end cover points to the electrode assembly, the reinforcing portion does not exceed the surface of the first protrusion facing the main body portion. In this way, the space of the first recess occupied by the reinforcing portion can be reduced, thereby leaving a larger arrangement space for the tab portion, which is conducive to reducing the risk of the reinforcing portion crushing the tab portion.

[0009] In some embodiments, the reinforcing portion protrudes from the bottom surface of the first recess by a size h1, the first protrusion protrudes from the bottom surface of the first recess by a size h2, and 0.01≤h1 / h2≤0.5. When h1 / h2 is greater than or equal to 0.01, the size of the reinforcing portion protruding from the bottom surface a is not too small, which is conducive to improving the structural reinforcing effect of the reinforcing portion on the bottom wall; when h1 / h2 is less than or equal to 0.5, the space of the first recess occupied by the reinforcing portion in the thickness direction is not too large, on the one hand, which is conducive to improving the space utilization rate and improving the energy density of the battery monomer, and on the other hand, it also leaves a larger arrangement space for the tab portion, which is conducive to reducing the risk of the reinforcing portion crushing the tab portion.

[0010] In some embodiments, the insulating main body comprises a second protrusion, the second protrusion protrudes from the bottom surface of the first recess, and along the first direction, the second protrusion is located between the two first protrusions; the first recess comprises two sub-recesses, the sub-recesses are located between the first protrusion and the second protrusion, and the bottom wall of each sub-recess is connected with a reinforcing portion. In this way, the bottom wall of each sub-recess 1 can be structurally reinforced, which is conducive to reducing the risk of deformation of the bottom wall of each sub-recess.

[0011] In some embodiments, the insulating main body is provided with an electrode leading hole, along the thickness direction of the insulating main body, the electrode leading hole penetrates the bottom wall of the first recess, along the first direction, the electrode leading hole is located between the first protrusion and the second protrusion; at least part of the plurality of reinforcing portions is arranged on both sides of the electrode leading hole along the second direction, or at least part of the reinforcing portions is arranged on at least one side of the electrode leading hole along the second direction; the first direction, the second direction and the thickness direction are perpendicular to each other. In this way, the structural strength of the two edges of the insulating main body along the second direction can be enhanced by the reinforcing portions, the possibility of the edges of the insulating main body being lifted up can be reduced, and the risk of deformation of the insulating main body can be further reduced.

[0012] In some embodiments, in the first direction, the electrode lead-out hole between the second protrusion and one of the first protrusions is closer to the first protrusion; the reinforcing portion extends in the first direction, and the plurality of reinforcing portions are respectively arranged on both sides of the electrode lead-out hole in the second direction, the reinforcing portion extends beyond the electrode lead-out hole by a distance L1 in the first direction towards the second protrusion, and the reinforcing portion extends beyond the electrode lead-out hole by a distance L2 in the first direction away from the second protrusion, L1>L2. More parts of the reinforcing portion are used to reinforce the part of the insulating body that is more prone to deformation, the distribution of the reinforcing portion is more reasonable, and the structural reinforcing effect of the reinforcing portion is improved.

[0013] In some embodiments, the insulating body is provided with an electrode lead-out hole, the electrode lead-out hole penetrates the bottom wall of the first recess in the thickness direction of the insulating body, and the electrode lead-out hole is located between the first protrusion and the second protrusion in the first direction; at least part of the plurality of reinforcing portions is arranged between the electrode lead-out hole and the second protrusion, or at least part of the reinforcing portions is arranged between the electrode lead-out hole and the second protrusion. Thus, the structural strength of the part of the insulating body between the electrode lead-out hole and the second protrusion can be enhanced by the reinforcing portions, and the risk of deformation of this part is reduced.

[0014] In some embodiments, the reinforcing portion includes a first part and a second part connected to each other, and the first part and the second part both extend obliquely relative to the first direction; in the second direction, part of the electrode lead-out hole is located between the first part and the second part, and the first direction, the second direction and the thickness direction of the insulating body are perpendicular to each other. The first part and the second part are connected at an angle, the first part and the second part can form two sides of a triangle, the structure of the reinforcing portion is more stable, the anti-deformation ability of the reinforcing portion is improved, and the structural reinforcing effect of the reinforcing portion on the insulating body is improved. The first part and the second part can play a structural reinforcing role on the surrounding part of the electrode lead-out hole from both sides of the electrode lead-out hole, and the risk of deformation of the surrounding part of the electrode lead-out hole is reduced.

[0015] In some embodiments, the insulating body is provided with an electrode lead-out hole, and the electrode lead-out hole penetrates the bottom wall of the first recess in the thickness direction of the insulating body; at least part of the reinforcing portion is distributed along the outer periphery of the electrode lead-out hole. Thus, the surrounding part of the electrode lead-out hole can be structurally reinforced from all directions of the outer periphery of the electrode lead-out hole, and the risk of deformation of the surrounding part of the electrode lead-out hole is reduced.

[0016] In some embodiments, the plurality of reinforcing portions includes at least three reinforcing portions that are not on the same straight line, and the connecting line between at least part of the three reinforcing portions adjacent to each other forms an equilateral triangle. The structure of the equilateral triangle is more stable, and through the interaction between the plurality of reinforcing portions, the structural reinforcing effect of the plurality of reinforcing portions on the insulating body is improved, and the risk of deformation of the insulating body is further reduced.

[0017] In some embodiments, in a projection plane perpendicular to the thickness direction of the insulating body, the reinforcing part has a circular orthographic projection, and a diameter of the orthographic projection of the reinforcing part is d, 0.01 mm≤d≤50 mm, and optionally, 2 mm≤d≤5 mm. d is greater than or equal to 0.01 mm, so that the size of the reinforcing part is not too small, which is conducive to improving the structural reinforcing effect of the reinforcing part on the insulating body; d is less than or equal to 50 mm, which can reduce the size of a single reinforcing part, is conducive to arranging more reinforcing parts in a limited space, improves the rationality of the position distribution of the reinforcing parts, and improves the structural reinforcing effect of the reinforcing parts on the insulating body.

[0018] In some embodiments, the electrode assembly includes a body part and a tab part led out by the body part, at least part of the tab part is accommodated in the first recess; the thickness direction of the insulating body is parallel to the vertical direction, and the end cover assembly is arranged on the lower side of the body part; the battery monomer includes a support arranged between the end cover assembly and the body part, and the reinforcing part abuts against the support. The support can hinder the movement of the reinforcing part in the direction of the electrode assembly, thereby inhibiting the deformation of the bottom wall in the direction of the electrode assembly, which is conducive to further reducing the risk of deformation of the insulating body.

[0019] In some embodiments, the bottom wall of the first recess includes a bottom wall body and a corrosion-resistant layer arranged on the side of the bottom wall body facing the electrode assembly. The corrosion-resistant layer can isolate the bottom wall body from the electrolyte or other fluids with corrosive effects, which can reduce the possibility of corrosion of the bottom wall body, and is conducive to reducing the risk of deformation of the insulating body due to corrosion and softening.

[0020] In some embodiments, the insulating body and the reinforcing part are integrally formed by an injection molding process, which is conducive to simplifying the molding process of the insulating part.

[0021] According to a second aspect of the present application, the present application provides a battery device including a plurality of battery monomers according to any one of the embodiments of the first aspect of the present application.

[0022] According to a third aspect of the present application, the present application provides a power consuming device including a battery device according to any one of the embodiments of the second aspect, and the battery device is used to provide electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0023] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0024] Figure 1 The structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0025] Figure 2 The exploded structural schematic diagram of a battery device is provided for some embodiments of the present application;

[0026] Figure 3A decomposition structure diagram of a battery cell provided for some embodiments of the present application;

[0027] Figure 4 A Figure 3 A cross-sectional view of the battery cell shown in FIG. 1;

[0028] Figure 5 A Figure 4 An enlarged structure diagram of region A shown in FIG. 2;

[0029] Figure 6 A Figure 4 A cross-sectional view of an end cover assembly of the battery cell shown in FIG. 3;

[0030] Figure 7 A Figure 6 An enlarged structure diagram of region B shown in FIG. 4;

[0031] Figure 8 A structure diagram of an insulating member of a battery cell provided for some embodiments of the present application;

[0032] Figure 9 A structure diagram of an insulating member of a battery cell provided for some embodiments of the present application;

[0033] Figure 10 A structure diagram of an insulating member of a battery cell provided for some embodiments of the present application;

[0034] Figure 11 A cross-sectional view of an insulating member of a battery cell provided for some embodiments of the present application.

[0035] Reference signs of the detailed description are as follows:

[0036] Vehicle 1, battery device 2, controller 3, motor 4;

[0037] Box 5, first box portion 5a, second box portion 5b, accommodation space 5c;

[0038] Battery cell 6, electrode assembly 10, main body portion 11, tab portion 12, case 20, opening 21, end cover assembly 30, end cover 31, second recess 311, insulating member 32, insulating main body 33, bottom wall 331, bottom wall main body 3311, corrosion-resistant layer 3312, first protrusion 332, second protrusion 333, pressure relief hole 334, electrode lead-out hole 335, surface 33a, reinforcing portion 34, first portion 341, second portion 342, first recess 35, sub recess 351, each sub recess 351, bottom surface 35a, structure 40, pressure relief mechanism 50, bracket 60, first direction X, second direction Y, thickness direction Z. DETAILED DESCRIPTION

[0039] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0040] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0041] In the present application, the phrase "embodiments" means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiments, nor are they necessarily mutually exclusive or alternative embodiments to each other.

[0042] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0044] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0045] "Multiple" appearing in the present application refers to two or more (including two).

[0046] In the embodiments of the present application, "parallel" not only includes the case of absolute parallel, but also includes the case of approximately parallel as generally recognized in engineering; at the same time, "perpendicular" not only includes the case of absolute perpendicular, but also includes the case of approximately perpendicular as generally recognized in engineering.

[0047] In the embodiments of the present application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0048] The battery cell can be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell, a lead-acid battery cell, etc., which are not limited in the embodiments of the present application.

[0049] The battery cell generally includes an electrode assembly, a housing, and an electrode terminal. The electrode assembly is accommodated in the housing, and the electrode terminal is provided in the housing. The housing is used to package the electrode assembly and electrolyte components. The electrode assembly includes a tab, which is electrically connected to the electrode terminal through an adapter or directly to the electrode terminal. The electrode terminal can be used to electrically connect the electrode assembly with the circuit outside the battery cell to realize the charging or discharging of the battery cell.

[0050] The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the short circuit of the positive and negative electrodes, and at the same time, the active ions can pass through.

[0051] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0052] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector and a negative electrode active material arranged on at least one surface of the negative electrode current collector.

[0053] In some embodiments, the separator is arranged between the positive electrode and the negative electrode.

[0054] In some embodiments, the separator is a separator film. The present application does not have special limitations on the type of separator film, and any known porous structure separator film with good chemical stability and mechanical stability can be selected.

[0055] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and to separate the positive electrode and the negative electrode.

[0056] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound to form the jelly-roll structure.

[0057] In some embodiments, the electrode assembly is in a stacked structure.

[0058] The battery device mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a hybrid manner by a busbar.

[0059] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0060] The battery device generally includes a case for packaging one or more battery cells. The case can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0061] As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into a separate module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie. The battery cell assembly can be accommodated in the case by fixing the battery module in the case. As an example, the case can 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 an enclosed space is formed inside the case to accommodate the battery cell assembly.

[0062] In some embodiments, the case can be part of the chassis structure of the vehicle. For example, part of the case can be at least part of the floor of the vehicle, or part of the case can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0063] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0064] In a battery cell, the shell usually comprises a casing and a cover assembly, the cover assembly covers the opening of the casing, so as to form a containing cavity together with the casing, the containing cavity is used for containing the electrode assembly, electrolyte and other components. The battery cell has various placement directions when in use, for example, the upright battery cell, the cover assembly is located at the top of the battery cell; the inverted battery cell, the cover assembly is located at the bottom of the battery cell. The cover assembly usually comprises a top cover made of metal and an insulating piece used for insulating the top cover from the casing, the insulating piece is usually made of plastic or other insulating materials. For the inverted battery cell, the free electrolyte in the battery cell will concentrate at the bottom of the battery cell under the action of gravity and soak the insulating piece of the cover assembly, so that the insulating piece softens and deforms, which has certain safety risks and affects the reliability of the battery cell.

[0065] In view of this, the embodiment of the present application provides a technical scheme, which sets a plurality of reinforcing parts on the insulating body of the insulating piece, and connects the reinforcing parts to the bottom wall of the first recess on the side of the insulating body facing the electrode assembly. The reinforcing parts can play the role of reinforcing ribs, and can improve the anti-deformation ability of the bottom wall of the first recess. In addition, the plurality of reinforcing parts are arranged at intervals, and the plurality of reinforcing parts can play a reinforcing role on different areas of the bottom wall, which is beneficial to improve the anti-deformation ability of the whole bottom wall, reduce the risk of deformation of the insulating piece, and improve the reliability of the battery cell.

[0066] The technical scheme provided by the embodiment of the present application is suitable for a battery cell, a battery device and an electric equipment using the battery device.

[0067] The battery device disclosed by the embodiment of the present application can be used in an electric equipment using the battery device as a power supply or a variety of energy storage systems using the battery device as an energy storage element. The electric equipment can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft and the like. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys, and the like, and the spacecraft can include airplanes, rockets, space shuttles and spaceships and the like.

[0068] The following embodiments are described taking the electric equipment as a vehicle for example for convenience of description.

[0069] Figure 1 FIG. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application. Referring to FIG. 1, the vehicle comprises a vehicle body 1, a battery device 2 and a plurality of wheels 3. Figure 1The vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle, etc. The vehicle 1 is internally provided with a battery device 2, which can be arranged at the bottom, head, or tail of the vehicle 1. The battery device 2 can be used for power supply of the vehicle 1, for example, the battery device 2 can be used as an operating power source of the vehicle 1. The vehicle 1 can further include a controller 3 and a motor 4, and the controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, to meet the power demand of the vehicle 1 during starting, navigation, and driving.

[0070] In some embodiments of the present application, the battery device 2 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0071] Figure 2 is a schematic diagram of the exploded structure of the battery device provided in some embodiments of the present application. Referring to Figure 2 The battery device 2 includes a box body 5 and a battery cell 6, and the battery cell 6 is contained in the box body 5. The box body 5 is used to provide a containing space for the battery cell 6, and the box body 5 can adopt various structures. In some embodiments, the box body 5 can include a first box body part 5a and a second box body part 5b, and the first box body part 5a and the second box body part 5b are mutually covered to jointly define a containing space 5c for containing the battery cell 6. The second box body part 5b can be a hollow structure with one end open, and the first box body part 5a can be a plate-shaped structure, which is covered on the open side of the second box body part 5b to jointly define the containing space with the second box body part 5b. The first box body part 5a and the second box body part 5b can also be hollow structures with one side open, and the open side of the first box body part 5a is covered on the open side of the second box body part 5b. Of course, the box body 5 formed by the first box body part 5a and the second box body part 5b can have various shapes, such as a cylinder, a cuboid, etc.

[0072] To improve the sealing performance of the first box body part 5a and the second box body part 5b after being connected, a sealing member such as sealing glue, a sealing ring, etc. can be arranged between the first box body part 5a and the second box body part 5b.

[0073] It is assumed that the first box body part 5a is covered on the top of the second box body part 5b, and the first box body part 5a can also be referred to as an upper box cover, and the second box body part 5b can also be referred to as a lower box body.

[0074] In the battery device 2, the battery cells 6 can be multiple, and the multiple battery cells 6 can be connected in series or in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 6 are connected in series and in parallel. The multiple battery cells 6 can be directly connected in series or in parallel or in a mixed manner, and the whole of the multiple battery cells 6 is accommodated in the case 5. Of course, the battery device 2 can also be that the multiple battery cells 6 are connected in series or in parallel or in a mixed manner to form a battery module, and the multiple battery modules are connected in series or in parallel or in a mixed manner to form a whole, and the whole is accommodated in the case 5. The battery device 2 can also include other structures, for example, the battery device 2 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 6.

[0075] Exemplarily, the battery cell 6 can be the smallest unit constituting the battery device 2.

[0076] Figure 3 is a schematic diagram of the exploded structure of the battery cell provided by some embodiments of the present application, Figure 4 is Figure 3 is a schematic diagram of the cross-sectional view of the battery cell shown in Figure 5 is Figure 4 is a schematic diagram of the enlarged structure of the region A in Figure 6 is Figure 4 is a schematic diagram of the cross-sectional view of the end cover assembly of the battery cell shown in Figure 7 is Figure 6 is a schematic diagram of the enlarged structure of the region B in Figure 8 is a schematic diagram of the structure of the insulating member of the battery cell provided by some embodiments of the present application, Figure 9 is a schematic diagram of the structure of the insulating member of the battery cell provided by some embodiments of the present application, Figure 10 is a schematic diagram of the structure of the insulating member of the battery cell provided by some embodiments of the present application, Figure 11 is a schematic diagram of the cross-sectional view of the insulating member of the battery cell provided by some embodiments of the present application.

[0077] With reference to Figures 3 to 11 , the embodiments of the present application provide a battery cell 6, which includes an electrode assembly 10, a shell 20 and an end cover assembly 30. The shell 20 has an opening 21. The electrode assembly 10 is accommodated in the shell 20. The end cover assembly 30 includes an end cover 31 and an insulating member 32. The end cover 31 covers the opening 21, and the insulating member 32 is arranged on the side of the end cover 31 facing the electrode assembly 10. The insulating member 32 includes an insulating body 33 and multiple reinforcing portions 34 arranged at intervals. The side of the insulating body 33 facing the electrode assembly 10 is provided with a first recess 35. The reinforcing portion 34 is connected to the bottom wall 331 of the first recess 35, and at least part of the reinforcing portion 34 protrudes from the bottom surface 35a of the first recess 35 facing the electrode assembly 10.

[0078] The housing 20 is a component used to cooperate with the end cap assembly 30 to form the internal cavity of the battery cell 6. The formed internal cavity can be used to accommodate the electrode assembly 10, electrolyte, and other components.

[0079] The shape of the housing 20 can be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 is a cuboid structure, a cuboid housing can be selected.

[0080] The housing 20 and the end cap assembly 30 can be separate components. The end cap assembly 30 can be connected to the housing 20 by welding, bonding, snap-fitting, or other means.

[0081] The housing 20 can be made of various materials, such as metal or plastic. Optionally, the housing 20 can be made of copper, iron, aluminum, steel, aluminum alloy, etc. For example, the housing 20 can be a steel shell, aluminum shell, plastic shell (such as polypropylene), composite metal shell (such as copper-aluminum composite shell), or aluminum-plastic film, etc.

[0082] The end cap 31 may be made of the same material as the housing 20 or a different material. The insulating component 32 may be made of plastic or other suitable insulating material.

[0083] The insulating element 32 can be attached to the end cap 31 by snap-fit, adhesive or other suitable means. The insulating element 32 can insulate the end cap 31 from the housing 20 and also from the electrode assembly 10.

[0084] The housing 20 may be open at one end or open at both ends. For example, the housing 20 may be open on one side, with one opening 21, and an end cap assembly 30 may be provided that covers the opening 21 of the housing 20. As another example, the housing 20 may also be open on both sides, with two end cap assemblies 30, each covering one of the two openings 21 of the housing 20.

[0085] Optionally, in Figure 3 In the embodiment shown, the housing 20 is a hollow structure with an opening 21, and the end cap assembly 30 is generally a plate-shaped structure that covers the opening 21.

[0086] In some examples, the opening 21 may be formed at the bottom of the housing 20, and the end cap assembly 30 may be located on the underside of the main body 11. In other examples, the opening 21 may also be formed at the top or other sides of the housing 20.

[0087] The first recess 35 is recessed towards the surface of the insulating body 33 facing the electrode assembly 10 in a direction towards the end cover 31. The first recess 35 can provide a certain arrangement space for the electrode assembly 10 (e.g. the tab of the electrode assembly 10) or other components (e.g. the adapter) of the battery cell 6, so that the structural layout of the battery cell 6 is more compact, which is conducive to improving the energy density of the battery cell 6.

[0088] The bottom wall 331 of the first recess 35 refers to the portion of the insulating body 33 corresponding to the first recess 35 along the thickness direction Z of the insulating body 33.

[0089] The material of the insulating body 33 and the reinforcing portion 34 can be the same or different.

[0090] In some examples, the insulating body 33 and the reinforcing portion 34 can be integrally formed by injection molding or other processes, which is conducive to simplifying the molding process of the insulating member 32. In other examples, the reinforcing portion 34 can also be connected to the bottom wall 331 of the first recess 35 by heat melting, plugging, bonding, clamping or other suitable methods, which is conducive to improving the flexibility of material selection of the reinforcing portion 34 and the insulating body 33.

[0091] The reinforcing portion 34 can protrude from the bottom surface 35a of the first recess 35 as a whole, or only a part of the reinforcing portion 34 can protrude from the bottom surface 35a of the first recess 35, and another part of the reinforcing portion 34 can be embedded in the bottom wall 331 of the first recess 35, for example. A part of the reinforcing portion 34 can also protrude from the surface of the insulating body 33 facing the end cover 31.

[0092] The bottom surface 35a of the first recess 35 refers to the surface of the insulating body 33 for surrounding the bottom of the first recess 35, which faces the electrode assembly 10 along the thickness direction Z of the insulating body 33.

[0093] Compared with other parts of the insulating body 33, the bottom wall 331 of the first recess 35 is relatively thin and more prone to deformation. In the embodiments of the present application, the bottom wall 331 of the first recess 35 is connected to a plurality of reinforcing portions 34, and at least a part of the reinforcing portions 34 protrude from the bottom surface 35a of the first recess 35. The reinforcing portions 34 can function as reinforcing ribs, which can improve the anti-deformation capability of the bottom wall 331. In addition, the reinforcing portions 34 are arranged at intervals, and the reinforcing portions 34 can reinforce different areas of the bottom wall 331, which is conducive to improving the overall anti-deformation capability of the bottom wall 331, reducing the risk of deformation of the insulating member 32, and improving the reliability of the battery cell 6.

[0094] In some embodiments, the density of the reinforcing portion 34 is greater than the density of the insulating body 33.

[0095] In some examples, the reinforcing portion 34 and the insulating body 33 are made of different materials. The reinforcing portion 34 can be made of an insulating material with a relatively high density, and the insulating body 33 can be made of an insulating material with a relatively low density.

[0096] In some other examples, the reinforcing portion 34 and the insulating body 33 can be made of the same material. The reinforcing portion 34 can have a higher degree of compactness than the insulating body 33. Optionally, the reinforcing portion 34 can be extruded during the forming process to reduce the number of pores in the reinforcing portion 34, increase the density of the reinforcing portion 34, and the like.

[0097] The reinforcing portion 34 has a higher density and a higher structural strength, which is conducive to improving the structural reinforcement effect of the reinforcing portion 34 on the insulating body 33 and further reducing the risk of deformation of the insulating body 33.

[0098] In some examples, the reinforcing portion 34 is connected to the end cover 31 and protrudes from the surface 33a of the insulating body 33 facing the end cover 31. Figure 6 Figure 7 The surface 33a of the insulating body 33 facing the end cover 31 can be connected to the end cover 31 by adhesion, attachment, or other suitable means.

[0099] The surface 33a of the insulating body 33 facing the end cover 31 can be connected to the end cover 31 by adhesion, attachment, or other suitable means.

[0100] In some examples, the bottom wall 331 of the first recess 35 can be provided with a through hole, and the reinforcing portion 34 is inserted into the through hole and is connected to the end cover 31 and / or the bottom wall 331 by heat melting. In some other examples, the reinforcing portion 34 and the insulating body 33 can be integrally formed.

[0101] The reinforcing portion 34 can fill part of the second recess 311 or fill the second recess 311.

[0102] The reinforcing portion 34 can fill part of the second recess 311 or fill the second recess 311.

[0103] The reinforcing portion 34 can fill part of the second recess 311 or fill the second recess 311.

[0104] ​In some embodiments, the electrode assembly 10 includes a main body portion 11 and a tab portion 12 extending from the main body portion 11, at least part of the tab portion 12 is accommodated in the first recess 35. The insulating body 33 includes two first protrusions 332 spaced apart along the first direction X, the first recess 35 is located between the two first protrusions 332 along the first direction X, the first protrusions 332 protrude from the bottom surface 35a of the first recess 35, and the first protrusions 332 abut against the main body portion 11. In the direction in which the end cover 31 points to the electrode assembly 10, the reinforcing portion 34 does not exceed the surface of the first protrusions 332 facing the main body portion 11.

[0105] The tab portion 12 can extend from one end of the main body portion 11 close to the end cover assembly 30. The battery cell 6 further includes an electrode lead-out structure 40 provided on the end cover assembly 30, the electrode lead-out structure 40 is used for connecting an external circuit, and the tab portion 12 is electrically connected to the electrode lead-out structure 40.

[0106] The main body portion 11 is the core part of the electrode assembly 10 for realizing the charging and discharging function, and the tab portion 12 can lead the current generated by the main body portion 11 out to the electrode lead-out structure 40, so as to be transmitted to the external circuit through the electrode lead-out structure 40.

[0107] The tab portion 12 can be two, and the two tab portions 12 are respectively a positive electrode tab portion and a negative electrode tab portion. The positive electrode tab portion can include a plurality of positive electrode tabs, and the negative electrode tab portion can include a plurality of negative electrode tabs.

[0108] The first recess 35 can provide at least part of the accommodation space for the tab portion 12, the tab portion 12 can be accommodated in the first recess 35 as a whole, or only part of the tab portion 12 can be accommodated in the first recess 35, and another part of the tab portion 12 can be inserted into the main body portion 11, for example.

[0109] The first protrusions 332 abut against the main body portion 11, and are used for limiting the main body portion 11, which is conducive to reducing the shaking of the main body portion 11. When the battery cell 6 is inverted, the end cover assembly 30 is located on the lower side of the main body portion 11, and the first protrusions 332 can be used to support the main body portion 11.

[0110] The end of the reinforcing portion 34 away from the bottom surface 35a can be flush with the surface of the first protrusions 332 facing the main body portion 11, or the end of the reinforcing portion 34 away from the bottom surface 35a can be closer to the bottom surface 35a than the surface of the first protrusions 332 facing the main body portion 11. In this way, the space of the first recess 35 occupied by the reinforcing portion 34 can be reduced, so as to leave a larger arrangement space for the tab portion 12, which is conducive to reducing the risk of the tab portion 12 being crushed by the reinforcing portion 34.

[0111] In some embodiments, referring to Figure 6 and Figure 7The dimension of the reinforcing portion 34 protruding from the bottom surface 35a of the first recessed portion 35 is h1, the dimension of the first protruding portion 332 protruding from the bottom surface 35a of the first recessed portion 35 is h2, and 0.01≤h1 / h2≤0.5.

[0112] Alternatively, h1 / h2 can be 0.01, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, or any value between any two of them.

[0113] In the embodiments of the present application, h1 / h2 is greater than or equal to 0.01, so that the dimension of the reinforcing portion 34 protruding from the bottom surface 35a is not too small, which is conducive to improving the structural reinforcing effect of the reinforcing portion 34 on the bottom wall 331. In the embodiments of the present application, h1 / h2 is less than or equal to 0.5, so that the space occupied by the reinforcing portion 34 in the first recessed portion 35 in the thickness direction Z is not too large, which is conducive to improving the space utilization rate and improving the energy density of the battery monomer 6, and on the other hand, it also leaves a larger arrangement space for the tab portion 12, which is conducive to reducing the risk of the reinforcing portion 34 crushing the tab portion 12.

[0114] In some embodiments, referring to Figures 6 to 10 The insulating body 33 includes a second protruding portion 333 protruding from the bottom surface 35a of the first recessed portion 35, and the second protruding portion 333 is located between the two first protruding portions 332 along the first direction X. The first recessed portion 35 can include two sub-recessed portions 351, and each sub-recessed portion 351 is connected with a reinforcing portion 34.

[0115] The second protruding portion 333 can abut against the main body portion 11 to limit the main body portion 11, so as to reduce the shaking of the main body portion 11. When the battery monomer 6 is inverted, the end cover assembly 30 is located at the lower side of the main body portion 11, and the second protruding portion 333 can be used to support the main body portion 11.

[0116] Alternatively, the second protruding portion 333 can be arranged at the middle portion between the two first protruding portions 332, so as to produce a relatively balanced limiting or supporting effect on the main body portion 11.

[0117] The end cover 31 can be provided with a pressure relief mechanism 50 for actuating to release the pressure in the battery monomer 6 when the internal pressure or temperature of the battery monomer 6 reaches a certain degree. The pressure relief mechanism 50 can be, for example, a pressure relief valve, an explosion-proof valve, etc. The second protruding portion 333 can be provided with a pressure relief hole 334, and the pressure relief hole 334 communicates the space on the side of the insulating piece 32 facing the electrode assembly 10 and the space on the side of the insulating piece 32 facing the end cover 31. The pressure in the battery monomer 6 can act on the pressure relief mechanism 50 through the pressure relief hole 334.

[0118] The bottom wall 331 of the first recess 35 includes the bottom walls of the two sub-recesses 351. The bottom wall of the sub-recess 351 can be the portion of the insulating body 33 corresponding to the sub-recess 351 in the thickness direction Z.

[0119] The bottom wall of each sub-recess 351 can be connected to one reinforcing portion 34 or to a plurality of reinforcing portions 34.

[0120] In the thickness direction Z, the thicknesses of the first protrusion 332 and the second protrusion 333 are relatively large and are not prone to deformation. The thicknesses of the bottom walls of the sub-recesses 351 are relatively small and are prone to deformation. In the embodiments of the present application, the bottom walls of the sub-recesses 351 are each connected to a reinforcing portion 34, which provides structural reinforcement to the bottom walls of the sub-recesses 351 and is conducive to reducing the risk of deformation of the bottom walls of the sub-recesses 351.

[0121] In some embodiments, referring to Figures 8 to 10 The insulating body 33 is provided with electrode lead-out holes 335 that extend through the bottom wall 331 of the first recess 35 in the thickness direction Z of the insulating body 33. In the first direction X, the electrode lead-out holes 335 are located between the first protrusion 332 and the second protrusion 333. At least some of the plurality of reinforcing portions 34 are located on both sides of the electrode lead-out holes 335 in the second direction Y, or at least some of the reinforcing portions 34 are located on at least one side of the electrode lead-out holes 335 in the second direction Y. The first direction X, the second direction Y, and the thickness direction Z are perpendicular to each other.

[0122] A portion of the electrode lead-out structure 40 can be accommodated in the electrode lead-out hole 335, and the electrode lead-out structure 40 is exposed to the side of the insulating body 33 facing the electrode assembly 10 through the electrode lead-out hole 335 to facilitate connection with the tab portion 12.

[0123] The number of electrode lead-out structures 40 and electrode lead-out holes 335 can each be two, and the two electrode lead-out structures 40 and the two electrode lead-out holes 335 are arranged one-to-one. The two electrode lead-out holes 335 are located between the second protrusion 333 and the two first protrusions 332, in other words, one electrode lead-out hole 335 is arranged between each first protrusion 332 and the second protrusion 333. The two electrode lead-out structures 40 are positive electrode lead-out structures and negative electrode lead-out structures, the positive electrode lead-out structures are connected to the positive electrode tab, and the negative electrode lead-out structures are connected to the negative electrode tab.

[0124] In some examples, referring to Figure 8In the projection plane perpendicular to the thickness direction Z, the size of the front projection of the reinforcing portion 34 is relatively small, and the number of the reinforcing portions 34 is relatively large. For example, the reinforcing portion 34 can be a columnar or bump-shaped structure. The plurality of reinforcing portions 34 can be distributed on both sides of the electrode lead-out hole 335 along the second direction Y, or only a part of the reinforcing portions 34 can be distributed on both sides of the electrode lead-out hole 335 along the second direction Y, and the other part of the reinforcing portions 34 can be distributed on at least one side of the electrode lead-out hole 335 along the first direction X, for example.

[0125] In other examples, referring to Figure 9 and Figure 10 In the projection plane perpendicular to the thickness direction Z, the size of the front projection of the reinforcing portion 34 is relatively large, and the number of the reinforcing portions 34 is relatively small. The reinforcing portion 34 can be provided on one side of the electrode lead-out hole 335 along the second direction Y as a whole, for example, the reinforcing portion 34 can be a strip-shaped structure extending along the first direction X; or only a part of the reinforcing portion 34 can be provided on at least one side of the electrode lead-out hole 335 along the second direction Y, and the other part of the reinforcing portion 34 can be provided on at least one side of the electrode lead-out hole 335 along the first direction X, for example, the reinforcing portion 34 can be a semi-enclosed structure in the shape of C, V, U or other suitable shape arranged around the outer periphery of the electrode lead-out hole 335, or the reinforcing portion 34 can be a ring-shaped structure arranged around the electrode lead-out hole 335.

[0126] The reinforcing portion 34 or at least a part of the reinforcing portion 34 provided on at least one side of the electrode lead-out hole 335 along the second direction Y can enhance the structural strength of the two edges of the insulating body 33 along the second direction Y, reduce the possibility of edge lifting of the insulating body 33, and further reduce the risk of deformation of the insulating body 33.

[0127] In some embodiments, referring to Figure 10 In the first direction X, the electrode lead-out hole 335 between the second protrusion 333 and one of the first protrusions 332 is closer to the one of the first protrusions 332. The reinforcing portion 34 extends along the first direction X, and a plurality of reinforcing portions 34 are respectively provided on both sides of the electrode lead-out hole 335 along the second direction Y. The reinforcing portion 34 extends beyond the size of the electrode lead-out hole 335 by L1 in the first direction X towards the second protrusion 333, and the reinforcing portion 34 extends beyond the size of the electrode lead-out hole 335 by L2 in the first direction X away from the second protrusion 333, L1>L2.

[0128] In the first direction X, both ends of the reinforcing portion 34 extend beyond the electrode lead-out hole 335. In other words, the reinforcing portion 34 extends beyond the electrode lead-out hole 335 in the first direction X towards the edge of the first protrusion 332, and the reinforcing portion 34 also extends beyond the electrode lead-out hole 335 in the first direction X towards the edge of the second protrusion 333.

[0129] L1 is a size of the reinforcing portion 34 in the first direction X beyond an edge of the electrode lead hole 335 facing the second protrusion 333, and L2 is a size of the reinforcing portion 34 in the first direction X beyond an edge of the electrode lead hole 335 facing the adjacent first protrusion 332.

[0130] The electrode lead hole 335 is closer to the first protrusion 332, and a distance between the electrode lead hole 335 and the first protrusion 332 is smaller than a distance between the electrode lead hole 335 and the second protrusion 333, and a portion of the bottom wall 331 between the electrode lead hole 335 and the second protrusion 333 is more likely to be deformed.

[0131] In the embodiments, L1 is set to be greater than L2, and more portions of the reinforcing portion 34 are used to reinforce the portion of the insulating body 33 that is more likely to be deformed, and the distribution of the reinforcing portion 34 is more reasonable, which is conducive to improving the structural reinforcing effect of the reinforcing portion 34.

[0132] In some embodiments, referring to Figure 8 and Figure 9 , the insulating body 33 is provided with the electrode lead hole 335, the electrode lead hole 335 penetrates the bottom wall 331 of the first recess 35 in the thickness direction Z of the insulating body 33, and the electrode lead hole 335 is located between the first protrusion 332 and the second protrusion 333 in the first direction X. At least part of the plurality of reinforcing portions 34 is arranged between the electrode lead hole 335 and the second protrusion 333, or at least part of the reinforcing portions 34 is arranged between the electrode lead hole 335 and the second protrusion 333.

[0133] In some examples, referring to Figure 8 , in a projection plane perpendicular to the thickness direction Z, the size of the orthogonal projection of the reinforcing portion 34 is relatively small, and the number of the reinforcing portions 34 is relatively large. For example, the reinforcing portion 34 can be a columnar or bump-shaped structure. The plurality of reinforcing portions 34 can be distributed between the electrode lead hole 335 and the second protrusion 333, or only part of the reinforcing portions 34 can be distributed between the electrode lead hole 335 and the second protrusion 333, and the other part of the reinforcing portions 34 can be distributed, for example, on at least one side of the electrode lead hole 335 in the second direction Y.

[0134] In other examples, referring to Figure 9 , in a projection plane perpendicular to the thickness direction Z, the size of the orthogonal projection of the reinforcing portion 34 is relatively large, and the number of the reinforcing portions 34 is relatively small. The reinforcing portions 34 can be arranged between the electrode lead hole 335 and the second protrusion 333; or only part of the reinforcing portions 34 can be arranged between the electrode lead hole 335 and the second protrusion 333, and the other part of the reinforcing portions 34 can be arranged, for example, on at least one side of the electrode lead hole 335 in the second direction Y.

[0135] The portion of the insulating body 33 between the electrode lead-out hole 335 and the second protrusion 333 has a relatively large size and is more prone to deformation. The embodiments of the present application have a reinforcing portion 34 or at least a part of the reinforcing portion 34 located between the electrode lead-out hole 335 and the second protrusion 333, which can enhance the structural strength of the portion of the insulating body 33 between the electrode lead-out hole 335 and the second protrusion 333 through the reinforcing portion 34, and is conducive to reducing the risk of deformation of the portion.

[0136] In some embodiments, with reference to Figure 9 The reinforcing portion 34 includes a first portion 341 and a second portion 342 connected to each other, and the first portion 341 and the second portion 342 both extend obliquely with respect to the first direction X. Along the second direction Y, a part of the electrode lead-out hole 335 is located between the first portion 341 and the second portion 342, and the first direction X, the second direction Y and the thickness direction Z of the insulating body 33 are perpendicular to each other.

[0137] The first portion 341 and the second portion 342 can form a V-shaped structure. The reinforcing portion 34 can be arranged to semi-enclose the electrode lead-out hole 335.

[0138] Optionally, the first portion 341 and the second portion 342 can be symmetrically arranged.

[0139] Optionally, an included angle of 60° can be formed between the first portion 341 and the second portion 342. The first portion 341 and the second portion 342 can form two sides of an equilateral triangle, so that the structure of the reinforcing portion 34 is more stable, which is conducive to improving the anti-deformation ability of the reinforcing portion 34.

[0140] A part of the first portion 341 is located on one side of the electrode lead-out hole 335 close to the second protrusion 333 along the first direction X, and another part of the first portion 341 is located on one side of the electrode lead-out hole 335 along the second direction Y. A part of the second portion 342 is located on one side of the electrode lead-out hole 335 close to the second protrusion 333 along the first direction X, and another part of the second portion 342 is located on the other side of the electrode lead-out hole 335 along the second direction Y.

[0141] The first portion 341 and the second portion 342 are connected at an angle, and the first portion 341 and the second portion 342 can form two sides of a triangle, so that the structure of the reinforcing portion 34 is more stable, and the anti-deformation capability of the reinforcing portion 34 is improved, and the structure reinforcing effect of the reinforcing portion 34 on the insulating main body 33 is improved. In addition, part of the electrode lead-out hole 335 is located between the first portion 341 and the second portion 342, and in the second direction Y, the electrode lead-out hole 335, the first portion 341 and the second portion 342 partially overlap, and the first portion 341 and the second portion 342 can play a structure reinforcing role on the surrounding part of the electrode lead-out hole 335 from both sides of the electrode lead-out hole 335, so as to reduce the risk of deformation of the surrounding part of the electrode lead-out hole 335.

[0142] In some embodiments, with reference to Figure 8 , the insulating main body 33 is provided with an electrode lead-out hole 335, and the electrode lead-out hole 335 penetrates the bottom wall 331 of the first recess 35 in the thickness direction Z of the insulating main body 33. At least part of the reinforcing portion 34 is distributed along the outer periphery of the electrode lead-out hole 335.

[0143] The plurality of reinforcing portions 34 can be uniformly distributed along the outer periphery of the electrode lead-out hole 335, or can be non-uniformly distributed. Alternatively, the number of reinforcing portions 34 distributed on the side of the electrode lead-out hole 335 facing the second protrusion 333 in the first direction X can be more, and the number of reinforcing portions 34 distributed on the side of the electrode lead-out hole 335 away from the second protrusion 333 in the first direction X and on both sides of the electrode lead-out hole 335 in the second direction Y can be relatively small.

[0144] At least part of the reinforcing portion 34 is distributed along the outer periphery of the electrode lead-out hole 335, which can play a structure reinforcing role on the surrounding part of the electrode lead-out hole 335 from each direction of the outer periphery of the electrode lead-out hole 335, so as to reduce the risk of deformation of the surrounding part of the electrode lead-out hole 335.

[0145] In some embodiments, with reference to Figure 8 , the plurality of reinforcing portions 34 includes at least three reinforcing portions 34 not on the same straight line, and the connecting line between at least part of the three reinforcing portions 34 adjacent to each other forms an equilateral triangle.

[0146] The plurality of reinforcing portions 34 can be distributed on at least two different straight lines.

[0147] The connecting line between the three reinforcing portions 34 adjacent to each other refers to the connecting line between the geometric centers of the orthographic projections of the three reinforcing portions 34 adjacent to each other in the projection plane perpendicular to the thickness direction Z.

[0148] The three reinforcing portions 34 adjacent to each other can surround a region in the shape of an approximately equilateral triangle, and the equilateral triangle structure is more stable, and the structural reinforcing effect of the reinforcing portions 34 on the insulating body 33 can be improved through the interaction between the reinforcing portions 34, and the risk of deformation of the insulating body 33 is further reduced.

[0149] In some embodiments, with reference to Figure 8 In the projection plane perpendicular to the thickness direction Z of the insulating body 33, the orthogonal projection of the reinforcing portion 34 is circular, and the diameter of the orthogonal projection of the reinforcing portion 34 is d, 0.01mm≤d≤50mm, and optionally, 2mm≤d≤5mm.

[0150] Optionally, d can be 0.01mm, 0.1mm, 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 6.0mm, 7.0mm, 8.0mm, 9.0mm, 10.0mm, 20.0mm, 30.0mm, 40.0mm, 50.0mm, or any value between any two of them.

[0151] In the embodiments of the present application, d is greater than or equal to 0.01mm, so that the size of the reinforcing portion 34 is not too small, which is conducive to improving the structural reinforcing effect of the reinforcing portion 34 on the insulating body 33; and d is less than or equal to 50mm, which can reduce the size of a single reinforcing portion 34, is conducive to arranging more reinforcing portions 34 in a limited space, improves the rationality of the position distribution of the reinforcing portions 34, and improves the structural reinforcing effect of the reinforcing portions 34 on the insulating body 33.

[0152] In some embodiments, with reference to Figure 4 and Figure 5 The thickness direction Z of the insulating body 33 is parallel to the vertical direction, and the end cover assembly 30 is arranged on the lower side of the body portion 11. The battery monomer 6 includes a support 60 arranged between the end cover assembly 30 and the body portion 11, and the reinforcing portion 34 abuts against the support 60.

[0153] The support 60 can be connected to the end cover assembly 30 by clamping, bonding or other suitable means.

[0154] The support 60 is used to support the body portion 11, and the support 60 can bear at least part of the weight of the body portion 11, reduce the load bearing of the end cover assembly 30, reduce the risk of deformation of the end cover assembly 30, and is conducive to improving the structural stability of the battery monomer 6.

[0155] The tab portion 12 can pass through the support 60 from top to bottom or be folded to the lower side of the support 60 so as to be connected to the electrode lead-out structure 40.

[0156] For the inverted battery cell 6, the end cover assembly 30 is located at the lower side of the main body 11, and the electrolyte inside the battery cell 6 can soak the insulation piece 32, and the insulation main body 33 is more prone to corrosion and softening to deform. The embodiment of the application abuts the reinforcing portion 34 against the support 60, and the support 60 can hinder the movement of the reinforcing portion 34 towards the electrode assembly 10, thereby inhibiting the deformation of the bottom wall 331 towards the electrode assembly 10, and facilitating the further reduction of the risk of deformation of the insulation main body 33.

[0157] In some embodiments, referring to Figure 11 , the bottom wall 331 of the first recess 35 includes a bottom wall main body 3311 and a corrosion-resistant layer 3312, and the corrosion-resistant layer 3312 is arranged on the side of the bottom wall main body 3311 facing the electrode assembly 10.

[0158] The corrosion-resistant layer 3312 can be coated on the surface of the bottom wall main body 3311 facing the electrode assembly 10. The surface of the corrosion-resistant layer 3312 facing the electrode assembly 10 forms the bottom surface 35a of the first recess 35.

[0159] The corrosion-resistant performance of the corrosion-resistant layer 3312 is better than that of the bottom wall main body 3311. Optionally, the materials of the bottom wall main body 3311, the first protrusion 332 and the second protrusion 333 can be the same. The bottom wall main body 3311, the first protrusion 332 and the second protrusion 333 can be integrally formed by an injection molding process. The corrosion-resistant layer 3312 can be made of epoxy, polyurethane, chlorinated rubber, acrylic or other suitable corrosion-resistant paint.

[0160] The corrosion-resistant layer 3312 can be of equal thickness or of unequal thickness. Optionally, the local part of the corrosion-resistant layer 3312 can be thickened to improve its corrosion-resistant effect.

[0161] The corrosion-resistant layer 3312 can isolate the bottom wall main body 3311 from the electrolyte or other fluids with corrosive effect, thereby reducing the possibility of corrosion of the bottom wall main body 3311 and facilitating the reduction of the risk of deformation of the insulation main body 33 due to corrosion and softening.

[0162] In some embodiments, the insulation main body 33 and the reinforcing portion 34 are integrally formed by an injection molding process, which facilitates the simplification of the molding process of the insulation piece 32.

[0163] Optionally, the reinforcing portion 34 can be formed by solidification and condensation of the gate residue in the injection molding process.

[0164] According to the second aspect of the application, the embodiment of the application further provides a battery device. The battery device 2 includes a plurality of battery cells 6 according to any embodiment of the first aspect of the application.

[0165] According to a third aspect of the present application, the embodiments of the present application further provide a power consuming device, which comprises the battery device according to any of the embodiments of the second aspect of the present application, and the battery device is configured to provide electric energy. The power consuming device can be any of the devices or systems described above.

[0166] The battery cell 6 provided by the embodiments of the present application comprises an electrode assembly 10, a case 20, and an end cap assembly 30. The case 20 has an opening 21 on the lower side. The electrode assembly 10 is accommodated in the case 20. The end cap assembly 30 comprises an end cap 31 and an insulating member 32, the end cap 31 covers the opening 21, and the insulating member 32 is arranged on the upper side of the end cap 31 facing the electrode assembly 10. The insulating member 32 comprises an insulating body 33 and a plurality of reinforcing portions 34 arranged at intervals, the side of the insulating body 33 facing the electrode assembly 10 is provided with a first recess 35, the reinforcing portions 34 are connected to the bottom wall 331 of the first recess 35, and at least part of the reinforcing portions 34 protrude from the bottom surface 35a of the first recess 35 facing the electrode assembly 10. The insulating body 33 comprises two first protrusions 332 arranged at intervals along the first direction X and a second protrusion 333, the first protrusions 332 and the second protrusion 333 protrude from the bottom surface 35a of the first recess 35. Along the first direction X, the second protrusion 333 is located between the two first protrusions 332, and the first recess 35 can comprise two sub-recesses 351, the sub-recesses 351 are located between the first protrusions 332 and the second protrusion 333, and the bottom wall of each sub-recess 351 is connected with a reinforcing portion 34.

[0167] In some examples, the reinforcing portions 34 extend along the first direction X, and the plurality of reinforcing portions 34 are respectively arranged on both sides of the electrode lead-out hole 335 along the second direction Y.

[0168] In other examples, the reinforcing portions 34 comprise a first portion 341 and a second portion 342 connected with each other, and the first portion 341 and the second portion 342 both extend obliquely relative to the first direction X.

[0169] In yet other examples, the plurality of reinforcing portions 34 comprise at least three reinforcing portions 34 not on the same straight line, and the connecting line between the at least partially adjacent three reinforcing portions 34 forms an equilateral triangle. In the projection plane perpendicular to the thickness direction Z of the insulating body 33, the orthographic projection of the reinforcing portion 34 is circular, the diameter of the orthographic projection of the reinforcing portion 34 is d, and 0.01 mm≤d≤50 mm, and optionally, 2 mm≤d≤5 mm.

[0170] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery cell includes: a housing having an opening; an electrode assembly accommodated in the housing; and a cap assembly including a cap covering the opening and an insulating member provided on a side of the cap facing the electrode assembly, the insulating member including an insulating body having a first recess provided on a side thereof facing the electrode assembly and a plurality of reinforcing portions spaced apart from each other and connected to a bottom wall of the first recess, at least a portion of the reinforcing portions protruding from a bottom surface of the first recess facing the electrode assembly. 2.The battery cell according to claim 1, wherein a density of the reinforcing portions is greater than a density of the insulating body. 3.The battery cell according to claim 1, wherein the reinforcing portions protrude from a surface of the insulating body facing the cap and are connected to the cap, a side of the cap facing the insulating member is provided with a second recess, and a portion of the reinforcing portions is accommodated in the second recess. 4.The battery cell according to any one of claims 1 to 3, wherein the electrode assembly includes a main body portion and a tab portion extending from the main body portion, and at least a portion of the tab portion is accommodated in the first recess; the insulating body includes two first protrusions spaced apart from each other in a first direction in which the first recess is located between the two first protrusions, the first protrusions protrude from a bottom surface of the first recess, and the first protrusions abut against the main body portion; in a direction of the cap directed toward the electrode assembly, the reinforcing portions do not exceed a surface of the first protrusions facing the main body portion. 5.The battery cell according to claim 4, wherein a size of the reinforcing portions protruding from the bottom surface of the first recess is h1, a size of the first protrusions protruding from the bottom surface of the first recess is h2, and 0.01≤h1 / h2≤0.

5. 6.The battery cell according to claim 4 or 5, wherein the insulating body includes a second protrusion protruding from the bottom surface of the first recess, and the second protrusion is located between the two first protrusions in the first direction; the first recess includes two sub recesses located between the first protrusions and the second protrusion, and a bottom wall of each of the sub recesses is connected to the reinforcing portions. 7.The battery cell according to claim 6, wherein the insulating body is provided with an electrode lead-out hole penetrating through the bottom wall of the first recess in a thickness direction of the insulating body, and the electrode lead-out hole is located between the first protrusions and the second protrusion in the first direction; at least a portion of the reinforcing portions is provided on both sides of the electrode lead-out hole in a second direction, or at least a portion of the reinforcing portions is provided on at least one side of the electrode lead-out hole in the second direction; the first direction, the second direction, and the thickness direction are perpendicular to each other. 8.The battery cell according to claim 7, wherein ​ In the first direction, the electrode lead hole between the second protrusion and one of the first protrusions is closer to the first protrusion; The reinforcing portions extend in the first direction, and the reinforcing portions are respectively arranged on both sides of the electrode lead hole in the second direction. The reinforcing portion exceeds the size of the electrode lead hole in the first direction by L1 towards the second protrusion, and the reinforcing portion exceeds the size of the electrode lead hole in the first direction by L2 away from the second protrusion, L1>L2.

9. The battery cell according to claim 6 or 7, wherein The insulating body is provided with an electrode lead hole, and the electrode lead hole penetrates the bottom wall of the first recess in the thickness direction of the insulating body. In the first direction, the electrode lead hole is located between the first protrusion and the second protrusion. At least part of the reinforcing portions is arranged between the electrode lead hole and the second protrusion, or at least part of the reinforcing portions is arranged between the electrode lead hole and the second protrusion.

10. The battery cell according to claim 9, wherein The reinforcing portion includes a first portion and a second portion connected to each other, and the first portion and the second portion are both inclined to extend relative to the first direction. In the second direction, a part of the electrode lead hole is located between the first portion and the second portion, and the first direction, the second direction, and the thickness direction of the insulating body are perpendicular to each other.

11. The battery cell according to any one of claims 1-7, 9, wherein The insulating body is provided with an electrode lead hole, and the electrode lead hole penetrates the bottom wall of the first recess in the thickness direction of the insulating body. At least part of the reinforcing portions is arranged along the outer periphery of the electrode lead hole.

12. The battery cell according to any one of claims 1-7, 9, 11, wherein The plurality of reinforcing portions includes at least three reinforcing portions that are not on the same straight line, and the connecting line between at least part of the three reinforcing portions adjacent to each other forms an equilateral triangle.

13. The battery cell according to any one of claims 1-7, 9, 11-12, wherein In the projection plane perpendicular to the thickness direction of the insulating body, the orthogonal projection of the reinforcing portion is circular, the diameter of the orthogonal projection of the reinforcing portion is d, and 0.01mm≤d≤50mm, and optionally, 2mm≤d≤5mm.

14. The battery cell according to any one of claims 1-12, wherein The electrode assembly includes a main body portion and a tab portion led out from the main body portion, at least part of the tab portion is accommodated in the first recess, the thickness direction of the insulating body is parallel to the vertical direction, and the end cover assembly is arranged on the lower side of the main body portion; The battery cell includes a support arranged between the end cover assembly and the main body portion, and the reinforcing portion abuts against the support.

15. The battery cell according to any one of claims 1-14, wherein A bottom wall of the first recess includes a bottom wall body and an anticorrosion layer, the anticorrosion layer being arranged on a side of the bottom wall body facing the electrode assembly. 16.The battery cell of any one of claims 1-14, wherein, The insulating body and the reinforcing portion are integrally formed by an injection molding process.

17. A battery device characterized by comprising: A plurality of battery cells according to any one of claims 1-16 are included.

18. An electrical device, characterized by A battery device according to claim 17 is included, the battery device being used to provide electrical energy.

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