Battery cell, battery, and electric device

Abstract

The application provides a battery monomer, a battery and a power utilization device. The battery monomer comprises a shell, an electrode assembly, an electrode terminal and a sealing member. The shell comprises a first wall, and the first wall is provided with a plurality of electrode lead-out holes. The electrode assembly is arranged in the shell and comprises a tab. The electrode terminal is arranged on the first wall and is electrically connected to the tab. In the thickness direction of the first wall, a single electrode terminal covers a plurality of electrode lead-out holes. At least part of the sealing member is arranged between the first wall and the electrode terminal and seals the plurality of electrode lead-out holes. In the embodiment of the application, a plurality of electrode lead-out holes are arranged on the first wall, and a single electrode terminal is arranged corresponding to the plurality of electrode lead-out holes. In this way, the radial size corresponding to a single electrode lead-out hole can be reduced, thereby reducing the size of the part structure of the sealing member for sealing a single electrode lead-out hole. Smaller size often means smaller risk of deformation failure, and thus helps to improve the sealing reliability of the battery monomer.

Description

Battery cell, battery and electric device TECHNICAL FIELD

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

[0002] Battery cells 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. The battery cell can include a cadmium-nickel battery cell, a hydrogen-nickel battery cell, a lithium-ion battery cell and a secondary alkaline zinc-manganese battery cell, etc.

[0003] However, there is a risk of sealing failure in the battery cell, which affects the normal use of the battery cell.

[0004] SUMMARY

[0005] In view of the above problems, the present application provides a battery cell, a battery and an electric device, which can improve the sealing reliability of the battery cell.

[0006] In one aspect, the present application provides a battery cell, which includes a shell, an electrode assembly, an electrode terminal and a sealing member. The shell includes a first wall, and the first wall is provided with a plurality of electrode lead-out holes. The electrode assembly is arranged in the shell and includes a tab. The electrode terminal is arranged on the first wall and electrically connected to the tab. In the thickness direction of the first wall, a single electrode terminal covers a plurality of electrode lead-out holes. At least part of the sealing member is arranged between the first wall and the electrode terminal and seals the plurality of electrode lead-out holes.

[0007] In the above scheme, a plurality of electrode lead-out holes are provided on the first wall, and a single electrode terminal is arranged corresponding to a plurality of electrode lead-out holes. In this way, the radial size corresponding to a single electrode lead-out hole can be reduced, thereby reducing the size of the part of the sealing member corresponding to the structure for sealing a single electrode lead-out hole. Smaller size often means smaller risk of deformation failure, thus helping to improve the corresponding sealing reliability of the battery cell.

[0008] In some embodiments, the electrode terminal includes a terminal body and a plurality of connecting portions. The terminal body is located on the side of the first wall away from the electrode assembly. The connecting portions are at least partially located in the electrode lead-out holes. At least part of the sealing member is located between the terminal body and the first wall.

[0009] In the above scheme, by arranging at least part of the sealing member between the terminal body and the first wall, the sealing member can meet the sealing requirement of the electrode lead-out holes. Further, the structure of the sealing member between the terminal body and the first wall can include a plurality of different structures arranged corresponding to the plurality of electrode lead-out holes, and the projection of each structure in the thickness direction can be arranged around the electrode lead-out holes to achieve the respective sealing of the plurality of electrode lead-out holes, so as to reduce the size of the part structure of the sealing member corresponding to the sealing of a single electrode lead-out hole, and reduce the risk of sealing failure of the battery monomer.

[0010] In some embodiments, the battery monomer further comprises a fixing member arranged around the periphery of the terminal body, and the terminal body is partially sandwiched between the fixing member and the first wall in the thickness direction, and an insulating member at least partially located between the fixing member and the terminal body.

[0011] In the above scheme, the mutual cooperation among the electrode terminal, the fixing member and the insulating member can meet the requirement of fixing the electrode terminal to the first wall, and thus the electrode terminal does not need to be subjected to operations such as flanging, thereby simplifying the structural complexity of the battery monomer at the electrode terminal, and also reducing the occupation of the internal space of the shell by the electrode terminal, which is beneficial to improve the corresponding energy density of the battery monomer, and has strong practicability.

[0012] In some embodiments, the sealing member includes a plurality of sealing rings arranged around the periphery of the connecting portion.

[0013] In the above scheme, by arranging the sealing member to include a plurality of sealing rings arranged corresponding to the plurality of electrode lead-out holes, the plurality of electrode lead-out holes can be individually sealed by the plurality of sealing rings. Compared with the technical scheme in the related art in which the sealing member only includes one sealing ring, this design helps to reduce the size of the single sealing ring, thereby reducing the risk of deformation failure of the sealing ring and improving the sealing reliability of the battery monomer.

[0014] In some embodiments, the sealing member further comprises a connecting member connecting different sealing rings.

[0015] In the above scheme, by arranging the connecting member in the sealing member, the relative fixation between different sealing rings can be achieved by the connecting member, and thus a plurality of sealing members can be assembled on the first wall during the preparation process of the battery monomer, thereby improving the assembly efficiency.

[0016] In some embodiments, the sealing ring and the connecting member are integrally formed.

[0017] In the above scheme, by setting the sealing ring and the connecting piece as an integral molding, the structural reliability between the sealing ring and the connecting piece can be improved. And in this way, the welding process can be cancelled, the adverse effects of the welding process on the sealing ring and the connecting part are reduced, and the corresponding structural reliability of the sealing ring and the connecting piece is improved.

[0018] In some embodiments, the sealing ring includes a first portion located away from the electrode assembly, and the connecting piece is connected to a different first portion. In the thickness direction of the first wall, the size of the connecting piece is smaller than the size of the first portion.

[0019] In the above scheme, by setting the size of the connecting piece in the thickness direction to be smaller than the size of the first portion, in the battery monomer, the first portion can be compressed to improve the sealing reliability, while the connecting piece is not compressed or is compressed to a lower degree, thereby reducing the size of the force exerted by the connecting piece on the first wall, reducing the risk of deformation of the portion of the first wall between the adjacent electrode lead-out holes, and improving the reliability of the battery monomer.

[0020] In some embodiments, the first wall includes a reinforcing rib structure between the adjacent electrode lead-out holes.

[0021] In the above scheme, due to the presence of the electrode lead-out hole, the local structure of the first wall between the adjacent electrode lead-out holes has a relatively low structural strength. In order to improve the deformation resistance of the first wall, the reinforcing rib structure is provided between the adjacent electrode lead-out holes, thereby improving the structural strength of the first wall at the position between the adjacent electrode lead-out holes, reducing the risk of excessive deformation of the first wall, and improving the reliability of the battery monomer.

[0022] In some embodiments, the first wall includes a terminal mounting portion and a boss structure protruding from the side of the terminal mounting portion away from the electrode assembly, the electrode lead-out hole penetrates the terminal mounting portion, the boss structure is arranged around the outer circumferential side of the electrode lead-out hole, and the boss structure is snap-fitted with the sealing member.

[0023] In the above scheme, by providing the boss structure on the first wall and snap-fitting the boss structure with the sealing member, the installation reliability between the sealing member and the first wall is improved. And the presence of the boss structure can play a positioning and limiting role for the sealing member, improving the reliability of the relative position between the first wall and the sealing member.

[0024] In some embodiments, the battery monomer further includes an insulating member, the insulating member is partially arranged around the circumferential side of the electrode terminal. In the thickness direction of the first wall, the insulating member is located between the first wall and the electrode terminal and connects the first wall and the electrode terminal.

[0025] In the above scheme, the insulating piece can not only insulate the electrode terminal from the first wall to meet the insulation requirement of the electrode terminal, but also can be connected to the first wall to make the first wall have a certain anti-deformation ability, improve the overall structural reliability of the battery monomer, and have strong practicability.

[0026] In some embodiments, the insulating piece includes a support portion, a first protruding portion protruding from a side of the support portion away from the electrode assembly, and a second protruding portion protruding from a side of the support portion toward the electrode assembly. The first protruding portion is insertedly connected to the electrode terminal, and the second protruding portion is insertedly connected to the first wall.

[0027] In the above scheme, the first protruding portion of the insulating piece can be insertedly connected to the electrode terminal, and the second protruding portion can be insertedly connected to the first wall. Compared with other connection modes, the inserted connection mode is simple to operate and can realize the fixation of the insulating piece relative to the electrode terminal and the first wall. Further, the first protruding portion and the second protruding portion are both fixed to the support portion, and when the first wall deforms, the support portion can provide a certain stress to the first wall, so that the first wall has a certain anti-deformation ability, and the overall structural reliability of the battery monomer is improved.

[0028] In some embodiments, the electrode terminal includes a terminal body located on a side of the first wall away from the electrode assembly, the terminal body has a first surface toward the electrode assembly, and a first recess recessed inward from the first surface. In a direction from the electrode assembly to the electrode terminal, a radial dimension of the first recess gradually increases, and the first protruding portion is located in the first recess. And / or, the first wall includes a terminal mounting portion, the terminal mounting portion has a second surface away from the electrode assembly, and electrode lead-out holes and a second recess recessed inward from the second surface and distributed in a staggered manner. In a direction from the electrode assembly to the electrode terminal, a radial dimension of the second recess gradually decreases, and the second protruding portion is located in the second recess.

[0029] In the above scheme, by providing the connecting holes in the current collecting member, the relative positioning between the current collecting member and the electrode terminal can be realized by the connecting holes, and the positional reliability therebetween is improved. At the same time, this design can also reduce the distance between the current collecting member and the first wall in the thickness direction, so that the part of the current collecting member between the adjacent connecting holes can support the first wall to a certain extent, and the corresponding anti-deformation ability of the first wall is further improved.

[0030] In some embodiments, in the thickness direction, the orthogonal projection of the electrode lead-out hole covers and exceeds the orthogonal projection of the connecting hole. The distance between the inner wall surface of the electrode lead-out hole and the inner wall surface of the connecting hole in the direction parallel to the first wall is D, and D satisfies: 0 < D ≤ 3 mm.

[0031] In the above scheme, the connection hole is arranged in the current collecting member, so that the current collecting member and the electrode terminal can be connected and fixed in a butt welding manner, thereby reducing the adverse effect of the welding process on the first wall, reducing the size of the distance D, and further reducing the distance A between adjacent connection holes, thereby improving the deformation resistance of the part of the current collecting member between the adjacent connection holes and the support capacity of the first wall, and improving the structural reliability of the first wall during use.

[0032] In some embodiments, the battery cell further includes a current collecting member, and the tab is electrically connected to the electrode terminal through the current collecting member. The current collecting member includes a main body portion and a plurality of protruding portions protruding from the main body portion, the protruding portions being at least partially located in the electrode lead-out hole and connected to the electrode terminal.

[0033] In the above scheme, the protruding portions are arranged in the current collecting member and deeply arranged in the electrode lead-out hole to realize the connection with the electrode terminal. This design enables the electrode terminal to not enter the space where the electrode assembly is located, thereby reducing the occupation of the internal space of the shell by the electrode terminal and improving the energy density of the battery cell.

[0034] In some embodiments, the first wall includes a third surface facing the electrode assembly, and the electrode terminal is partially arranged beyond the third surface and connected to the tab.

[0035] In the above scheme, the electrode terminal can enter the space where the electrode assembly is located through the electrode lead-out hole, and the electrode terminal can also be partially arranged beyond the third surface. On this basis, the electrode terminal is directly connected to the tab, thereby canceling the arrangement of the current collecting member and simplifying the structural layout in the battery cell.

[0036] In some embodiments, the battery cell further includes a current collecting member connected to the tab, the first wall includes a third surface facing the electrode assembly, and the electrode terminal is partially arranged beyond the third surface and connected to a surface of the current collecting member facing the electrode terminal.

[0037] In the above scheme, the electrode terminal can enter the space where the electrode assembly is located through the electrode lead-out hole, and the electrode terminal can also be partially arranged beyond the third surface. On this basis, the electrode terminal can be connected to the current collecting member in a penetrating welding manner, and the electrode terminal and the tab are electrically connected through the current collecting member.

[0038] In a second aspect, the embodiments of the present application provide a battery, which includes the battery cell in any of the foregoing embodiments.

[0039] In a third aspect, the embodiments of the present application provide a power utilization device, which includes the battery cell in any of the foregoing embodiments, and the battery cell is used to provide electric energy.

[0040] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0042] Fig. 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0043] Fig. 2 is an exploded structural schematic diagram of a battery provided by an embodiment of the present application;

[0044] Fig. 3 is an internal structural schematic diagram of a battery module provided by an embodiment of the present application;

[0045] Fig. 4 is a sectional structural schematic diagram of a battery cell provided by an embodiment of the present application;

[0046] Fig. 5 is an enlarged structural schematic diagram of region Q in Fig. 4;

[0047] Fig. 6 is an enlarged structural schematic diagram of region P in Fig. 5;

[0048] Fig. 7 is a structural schematic diagram of a first wall in another battery cell provided by an embodiment of the present application;

[0049] Fig. 8 is a structural schematic diagram of a first wall in another battery cell provided by an embodiment of the present application;

[0050] Fig. 9 is a sectional structural schematic diagram of A-A in Fig. 5;

[0051] Fig. 10 is a partial sectional structural schematic diagram of another battery cell provided by an embodiment of the present application;

[0052] Fig. 11 is a partial sectional structural schematic diagram of another battery cell provided by an embodiment of the present application;

[0053] Fig. 12 is a partial sectional structural schematic diagram of another battery cell provided by an embodiment of the present application;

[0054] Fig. 13 is a partial sectional structural schematic diagram of another battery cell provided by an embodiment of the present application.

[0055] The reference signs of the specific embodiments are as follows: 1000, vehicle; 100, battery; 200, controller; 300, motor; 400, case; 41, first case portion; 42, second case portion; 500, battery cell; 600, battery module; 10, housing; 11, first wall; 12, electrode lead-out hole; 13, terminal mounting portion; 14, second recess; 15, boss structure; 20, electrode assembly; 21, tab; 30, electrode terminal; 31, terminal main body; 32, connecting portion; 33, first recess; 40, seal; 41, seal ring; 411, first portion; 42, connecting member; 43, groove structure; 50, insulating member; 51, support portion; 52, first protruding portion; 53, second protruding portion; 60, fixing member; 70, current collecting member; 71, connecting hole; 72, main body portion; 73, protruding portion; M1, first surface; M2, second surface; M3, third surface; J, reinforcing rib structure; X, thickness direction. DETAILED DESCRIPTION

[0056] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "have" and any variations thereof used in the specification and the claims and the above description of drawings are intended to cover the non-exclusive inclusion.

[0058] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0059] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can 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 all refer to the same embodiment, nor is it necessarily mutually exclusive or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0060] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0061] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0062] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0063] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0064] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging of the battery cell.

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

[0066] The battery cell generally includes an electrode assembly. 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 inserted 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 positive and negative electrodes from short-circuiting to a certain extent, and at the same time allow the active ions to pass through.

[0067] 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 disposed on at least one surface of the positive electrode current collector.

[0068] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0069] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0070] As an example, the positive electrode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. Among them, examples of lithium-containing phosphates can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon.

[0071] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0072] As an example, the negative electrode current collector can employ a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be employed. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0073] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0074] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either one or both of the two surfaces of the negative current collector.

[0075] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc.

[0076] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0077] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0078] In some embodiments, the separator is a separator film. The type of the separator film is not particularly limited in the present application, and any known porous structure separator film having good chemical stability and mechanical stability can be selected.

[0079] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic.

[0080] 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 separate the positive electrode and the negative electrode.

[0081] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive electrode and the negative electrode. The type of the electrolyte is not particularly limited in the present application, and can be selected as needed. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0082] 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.

[0083] In some embodiments, the electrode assembly is in a stack structure.

[0084] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0085] In some embodiments, the electrode assembly is provided with tabs, which can guide current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0086] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can 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, etc.

[0087] In some embodiments, the housing can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect with the electrode assembly for outputting or inputting the electrical energy of the battery cell.

[0088] In some embodiments, the housing can be provided with a current collecting member, and the electrode assembly can be electrically connected to the electrode terminals provided on the housing through the current collecting member.

[0089] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a square battery cell, a blade battery cell, a multi-prismatic battery cell (such as a hexagonal battery cell), etc., without specific limitation in the present application.

[0090] The battery referred to in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0091] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0092] In some embodiments, the battery can be a battery pack, and the battery pack includes a box body and battery cells, and the battery cells or the battery module are accommodated in the box body.

[0093] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0094] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0095] The battery cell includes an electrode assembly, a first wall, an electrode terminal provided on the first wall, and a sealing structure at least partially located between the first wall and the electrode terminal. The sealing structure is a structural component for sealing effect, and the size of the sealing structure is generally positively correlated with the size of the electrode terminal, i.e., the larger the size of the electrode terminal, the larger the corresponding size of the sealing structure.

[0096] Further, with the increase of the overcurrent capacity of the battery cell, the size of the electrode terminal also needs to be increased, thereby increasing the size of the sealing structure. For the sealing structure, under the same deformation degree, the larger the size of the sealing structure, the more likely it is to fail due to deformation, thereby causing the battery cell to fail to seal.

[0097] Based on the above technical problems, the present application provides a battery cell, a battery and a power consumption device. By providing a plurality of electrode lead-out holes and a sealing element for sealing the plurality of electrode lead-out holes, the part of the sealing element for sealing a single electrode lead-out hole has a smaller size, which helps to reduce the risk of deformation failure of the sealing element and improve the sealing reliability of the battery cell.

[0098] The technical solutions described in the embodiments of the present application are applicable to batteries and power consumption devices using batteries. The power consumption devices include mobile phones, portable devices, notebook computers, electric vehicles, electric cars, ships, spacecraft, electric toys and electric tools, etc. The spacecraft includes airplanes, rockets, space shuttles and spacecraft, etc. The electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys, etc. The electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and electric tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planes, etc.

[0099] The battery cell described in the embodiments of the present application is not limited to the power consumption devices described above. For the sake of brevity, the following embodiments are described with reference to an electric car.

[0100] Please refer to FIG. 1, which is a simple schematic diagram of a vehicle 1000 according to an embodiment of the present application. The vehicle 1000 can be a fuel car, a gas car or a new energy car, which can be a pure electric car, a hybrid car or a range extended car, etc. The vehicle 1000 can be provided with a battery 100, for example, at the bottom, the front or the rear of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, as the operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 can be used to control the power supply of the motor 300 by the battery. The battery can be used for starting and navigation of the vehicle 1000, and of course, the battery 100 can also be used to drive the vehicle 1000 to run, instead of or partially instead of fuel or natural gas to provide driving for the vehicle 1000.

[0101] Figure 2 is an exploded schematic view of a battery according to some embodiments of the present application. As shown in Figure 2, the battery 100 includes a case 400 and battery cells (not shown in the figure), which are accommodated in the case 400.

[0102] The case 400 is used to accommodate the battery cells, and the case 400 can have various structures. In some embodiments, the case 400 can include a first case portion 41 and a second case portion 42, the first case portion 41 and the second case portion 42 are mutually coverable, and the first case portion 41 and the second case portion 42 together define an accommodation portion for accommodating the battery cells. The second case portion 42 can be a hollow structure with one end open, and the first case portion 41 is a plate-like structure, which is coverable to the open side of the second case portion 42 to form a case with the accommodation portion; or the first case portion 41 and the second case portion 42 can both be hollow structures with one side open, and the open side of the first case portion 41 is coverable to the open side of the second case portion 42 to form the case 400 with the accommodation portion. Of course, the first case portion 41 and the second case portion 42 can have various shapes, such as a cylinder, a cuboid, etc.

[0103] In the battery 100, the battery cells can be one or multiple. If the battery cells are multiple, the multiple battery cells can be connected in series, in parallel, or in a mixed manner, where the mixed manner means that the multiple battery cells are connected in series and in parallel. The multiple battery cells can be directly connected in series, in parallel, or in a mixed manner, and then the whole of the multiple battery cells is accommodated in the case 400; or the multiple battery cells can be first connected in series, in parallel, or in a mixed manner to form a battery module 600, and then the multiple battery modules 600 are connected in series, in parallel, or in a mixed manner to form a whole, which is accommodated in the case 400.

[0104] Figure 3 is a structural schematic view of the battery module 600 shown in Figure 2. In some embodiments, as shown in Figure 3, the battery cells 500 are multiple, and the multiple battery cells 500 are first connected in series, in parallel, or in a mixed manner to form the battery module 600. Then the multiple battery modules 600 are connected in series, in parallel, or in a mixed manner to form a whole, which is accommodated in the case.

[0105] Next, the structure of the battery cell will be described in conjunction with the accompanying drawings.

[0106] Referring to Figures 4 and 5, the battery cell 500 includes a housing 10, an electrode assembly 20, an electrode terminal 30, and a sealing member 40. The housing 10 includes a first wall 11, which is provided with a plurality of electrode lead-out holes 12. The electrode assembly 20 is disposed in the housing 10 and includes a tab 21. The electrode terminal 30 is disposed on the first wall 11 and electrically connected to the tab 21. In the thickness direction X of the first wall 11, a single electrode terminal 30 covers the plurality of electrode lead-out holes 12. At least part of the sealing member 40 is disposed between the first wall 11 and the electrode terminal 30 and seals the plurality of electrode lead-out holes 12.

[0107] The battery cell 500 is a component structure for providing electric energy, and is provided with an outer shell 10 in a hollow structure for protecting other component structures inside. The electrode assembly 20 and other components can be arranged inside the outer shell 10, and the electrode assembly 20 is a main component for providing electric energy in the electrode cell.

[0108] The shape of the outer shell 10 can be determined according to the specific shape of the electrode assembly 20, that is, the shape of the outer shell 10 can be adapted to the shape of the electrode assembly 20, for example, when the electrode assembly 20 is a cylindrical structure, a cylindrical outer shell 10 can be selected; when the electrode assembly 20 is a cuboid structure, a cuboid outer shell 10 can be selected. Alternatively, according to different actual needs, the shape of the outer shell 10 can also be different from the shape of the electrode assembly 20, for example, when the electrode assembly 20 is a cylindrical structure, the outer shell 10 can be a cuboid structure or other polygonal structure; when the electrode assembly 20 is a cuboid structure, the outer shell 10 can be a cylindrical structure.

[0109] In some embodiments, the outer shell 10 can be a sealed structure or a non-sealed structure. As an example, when the outer shell 10 is a sealed structure, the outer shell 10 can protect the electrode assembly 20 and prevent leakage of electrolyte and the like. When the outer shell 10 is a non-sealed structure, the outer shell 10 can protect the electrode assembly 20, and a sealing bag can be further included between the outer shell 10 and the electrode assembly 20, which is used to package the electrode assembly 20 and electrolyte and the like. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum plastic film.

[0110] The electrode assembly 20 includes a tab 21, which is electrically connected to an electrode terminal 30 for outputting or inputting electric energy of the battery cell 500. Alternatively, the tab 21 is arranged corresponding to the electrode terminal 30, the electrode assembly 20 includes two tabs 21 with different polarities, and the number of electrode terminals 30 can also be two, and the two electrode terminals 30 are arranged insulated from each other and respectively electrically connected to different tabs 21.

[0111] The first wall 11 is a wall structure on the outer shell 10, and the electrode lead-out hole 12 is arranged through the first wall 11 in the thickness direction X of the first wall 11. The electrode terminal 30 is fixed to the first wall 11, and in the thickness direction X of the first wall 11, a single electrode terminal 30 covers multiple electrode lead-out holes 12, that is, the projection of a single electrode terminal 30 in the thickness direction X can simultaneously overlap the projections of multiple electrode lead-out holes 12 in the thickness direction X.

[0112] It should be noted that the electrode terminal 30 and the electrode lead-out hole 12 can have various positional relationships, for example, the electrode terminal 30 can be completely located in the electrode lead-out hole 12, or the electrode terminal 30 can be partially located in the electrode lead-out hole 12, partially located on at least one side of the first wall 11 in the thickness direction X, or the electrode terminal 30 can be completely located outside the electrode lead-out hole 12, as long as the electrode terminal 30 can be connected to the space where the electrode assembly 20 is located through the electrode lead-out hole 12, or the electrode terminal 30 enters the space where the electrode assembly 20 is located through the electrode lead-out hole 12, to meet the electrical connection needs of the electrode terminal 30 and the tab 21 in the electrode assembly 20.

[0113] The sealing member 40 is a structural component for sealing effect, and the sealing member 40 is at least partially sandwiched between the electrode terminal 30 and the first wall 11 in the thickness direction X to seal the electrode lead-out hole 12 from the external environment of the battery monomer 500. The sealing member 40 has various materials and structural forms, for example, the sealing member 40 can include materials such as rubber, and the sealing member 40 can be completely sandwiched between the electrode terminal 30 and the first wall 11 in the thickness direction X, or the sealing member 40 can be partially sandwiched between the electrode terminal 30 and the first wall 11, partially located in the electrode lead-out hole 12.

[0114] The sealing member 40 can seal multiple electrode lead-out holes 12, specifically, the sealing member 40 can include multiple different structures corresponding to multiple electrode lead-out holes 12, each structure is arranged on the first wall 11 and the projection of the first wall 11 in the thickness direction X can surround a single electrode lead-out hole 12 to achieve the sealing effect of each electrode lead-out hole 12. Among them, according to different actual needs, multiple different structures corresponding to multiple electrode lead-out holes 12 in the sealing member 40 can be arranged in connection with each other, or can be arranged in separation from each other.

[0115] In related technologies, a single electrode terminal 30 is only arranged corresponding to a single electrode lead-out hole 12, and the increase in the size of the electrode terminal 30 will cause the increase in the corresponding radial size of the electrode lead-out hole 12, and further cause the increase in the size of the sealing structure arranged around the electrode lead-out hole 12, which is easy to cause the problem of sealing failure of the battery monomer 500.

[0116] And in the embodiment of the present application, multiple electrode lead-out holes 12 are arranged on the first wall 11, and a single electrode terminal 30 is arranged corresponding to multiple electrode lead-out holes 12, which can reduce the corresponding radial size of a single electrode lead-out hole 12, thereby reducing the corresponding size of the part of the sealing member 40 for sealing a single electrode lead-out hole 12, and smaller size often means smaller risk of deformation failure, thus helping to improve the corresponding sealing reliability of the battery monomer 500.

[0117] In some embodiments, as shown in FIG. 4 and FIG. 5, the electrode terminal 30 comprises a terminal body 31 and a plurality of connecting portions 32, the terminal body 31 is located on the side of the first wall 11 away from the electrode assembly 20, the connecting portions 32 are at least partially located in the electrode lead-out holes 12, and at least part of the sealing member 40 is located between the terminal body 31 and the first wall 11.

[0118] The electrode terminal 30 at least comprises a terminal body 31 and a connecting portion 32, the terminal body 31 is the part of the electrode terminal 30 located on the side of the first wall 11 away from the electrode assembly 20, and the battery can optionally comprise a plurality of battery monomers 500 and a busbar, the busbar can be connected with the terminal body 31 in different battery monomers 500 to realize the series or parallel connection between different battery monomers 500.

[0119] The connecting portion 32 is connected to the terminal body 31, the connecting portion 32 can comprise the same material as the terminal body 31 and be formed in the same process. Alternatively, the connecting portion 32 can comprise different materials from the terminal body 31 and be connected and fixed by welding or the like. The number of the connecting portions 32 is multiple, and at least part of the multiple connecting portions 32 are separately arranged in the multiple electrode lead-out holes 12. The multiple connecting portions 32 are arranged corresponding to the multiple electrode lead-out holes 12, wherein the connecting portion 32 and the electrode lead-out hole 12 can have various positional relationships, for example, the connecting portion 32 can be completely located in the electrode lead-out hole 12, or the connecting portion 32 can partially exceed the side surface of the first wall 11 towards the electrode assembly 20, so that the connecting portion 32 partially penetrates into the space where the electrode assembly 20 is located.

[0120] At least part of the structure of the sealing member 40 is clamped between the terminal body 31 and the first wall 11 in the thickness direction X, and further, the projection of the structure of the sealing member 40 located between the terminal body 31 and the first wall 11 in the thickness direction X surrounds the projection of the electrode lead-out hole 12 in the thickness direction X, so as to realize the sealing effect of the electrode lead-out hole 12. Wherein, the sealing member 40 and the electrode lead-out hole 12 can have various positional relationships, for example, the sealing member 40 can be completely located on the side of the first wall 11 away from the electrode assembly 20, that is, the sealing member 40 is completely located outside the electrode lead-out hole 12, or the sealing member 40 is partially located on the side of the first wall 11 away from the electrode assembly 20 and partially located in the electrode lead-out hole 12. Wherein, the part of the sealing member 40 located in the electrode lead-out hole 12 can be used for positioning.

[0121] In the embodiments of the present application, by arranging at least part of the sealing member 40 between the terminal body 31 and the first wall 11, the sealing member 40 can meet the sealing requirement of the electrode lead-out hole 12. Further, the structure of the sealing member 40 between the terminal body 31 and the first wall 11 can include a plurality of different structures corresponding to a plurality of electrode lead-out holes 12, and the projection of each structure in the thickness direction X can be arranged around the electrode lead-out hole 12 to achieve the respective sealing of the plurality of electrode lead-out holes 12, so as to reduce the size of the part of the sealing member 40 corresponding to the structure for sealing a single electrode lead-out hole 12, and reduce the risk of sealing failure of the battery monomer 500.

[0122] It should be noted that in other embodiments, the electrode terminal 30 can also only include the terminal body 31, i.e., the electrode terminal 30 is completely located on the side of the first wall 11 away from the electrode assembly 20. In this case, at least part of the sealing member 40 is also clamped between the terminal body 31 and the first wall 11 along the thickness direction X. Further optionally, the battery monomer 500 further includes the current collecting member 70, which needs to be partially located in the electrode lead-out hole 12 to meet the electrical connection requirement between the electrode terminal 30 and the tab 21.

[0123] In some embodiments, as shown in FIGS. 4 and 5, the battery monomer 500 further includes the fixing member 60 and the insulating member 50, the fixing member 60 is arranged around the peripheral side of the terminal body 31, and in the thickness direction X, the terminal body 31 is partially clamped between the fixing member 60 and the first wall 11, and the insulating member 50 is at least partially located between the fixing member 60 and the terminal body 31.

[0124] The fixing member 60 is a component structure for achieving the relative fixation between the electrode terminal 30 and the first wall 11, the insulating member 50 is arranged around the terminal body 31 and at least partially located between the fixing member 60 and the terminal body 31, and the insulating member 50 includes an insulating material and is a component structure for insulation.

[0125] During the preparation of the battery monomer 500, the shell 10 of the battery monomer 500 can be assembled and fixed first, and then the electrode terminal 30, the fixing member 60 and the insulating member 50 are connected and fixed by welding or the like, and finally the electrode terminal 30, the fixing member 60 and the insulating member 50 are collectively fixed on the shell 10 to achieve the insulation and fixation of the electrode terminal 30 relative to the shell 10.

[0126] In the embodiment of the present application, the cooperation among the electrode terminal 30, the fixing member 60 and the insulating member 50 can meet the requirement of fixing the electrode terminal 30 to the first wall 11, and thus there is no need to perform operations such as flanging on the electrode terminal 30, thereby simplifying the structural complexity of the battery monomer 500 at the electrode terminal 30, and also reducing the occupation of the internal space of the shell 10 by the electrode terminal 30, which is beneficial to improving the corresponding energy density of the battery monomer 500, and has strong practicability.

[0127] In some embodiments, referring to FIGS. 4-6, the sealing member 40 includes a plurality of sealing rings 41 arranged around the connecting portion 32.

[0128] The plurality of sealing rings 41 are arranged corresponding to the plurality of electrode lead-out holes 12 and are used for sealing the plurality of electrode lead-out holes 12. According to actual requirements, different sealing rings 41 can be arranged separately from each other, or can be fixed relative to each other. The profile shape, size and material composition of different sealing rings 41 can be the same or similar, or can be different. Alternatively, the size and shape of each sealing ring 41 can match the size and shape of the corresponding electrode lead-out hole 12.

[0129] The sealing ring 41 can have various structural forms. For example, the sealing ring 41 can be completely clamped between the first wall 11 and the terminal body 31, i.e., the sealing ring 41 is completely located on the side of the first wall 11 away from the electrode assembly 20. Alternatively, the sealing ring 41 can be partially clamped between the first wall 11 and the terminal body 31, and partially located in the electrode lead-out hole 12. The structure of the part of the sealing ring 41 located in the electrode lead-out hole 12 can be used for positioning, thereby improving the relative position accuracy between the sealing ring 41 and the corresponding electrode lead-out hole 12.

[0130] In the embodiment of the present application, the sealing member 40 is arranged to include a plurality of sealing rings 41 arranged corresponding to the plurality of electrode lead-out holes 12, so that the plurality of electrode lead-out holes 12 are individually sealed by the plurality of sealing rings 41. Compared with the technical solution in the related art in which the sealing member 40 only includes one sealing ring 41, this design helps to reduce the size of the single sealing ring 41, thereby reducing the risk of deformation and failure of the sealing ring 41, and improving the sealing reliability of the battery monomer 500.

[0131] In some embodiments, as shown in FIGS. 4-6, the sealing member 40 further includes a connecting member 42 connecting different sealing rings 41.

[0132] The connecting pieces 42 are used to connect different sealing rings 41, so that different sealing rings 41 can be kept relatively fixed. The connecting pieces 42 can have various forms, for example, the connecting pieces 42 can have a strip or block structure, and the connecting pieces 42 are completely located between adjacent sealing rings 41, so that both ends of the connecting pieces 42 can be connected to different sealing rings 41 to fix different sealing rings 41, or the connecting pieces 42 can also be arranged to surround multiple sealing rings 41 at the same time.

[0133] The connecting pieces 42 and the sealing rings 41 can have various connection forms, for example, the connecting pieces 42 and the sealing rings 41 can be made of the same material and have an integrated structure, or the connecting pieces 42 and the sealing rings 41 can also be made of different materials and be connected and fixed by bonding or the like. Further, the dimensions of the connecting pieces 42 and the sealing rings 41 located between the terminal body 31 and the first wall 11 in the thickness direction X can be consistent, or the dimensions of the connecting pieces 42 and the sealing rings 41 located between the terminal body 31 and the first wall 11 in the thickness direction X can also have differences.

[0134] In the embodiments of the present application, the connecting pieces 42 are arranged in the sealing member 40, so that the relative fixation between different sealing rings 41 can be achieved by the connecting pieces 42, and then multiple sealing members 40 can be assembled on the first wall 11 during the preparation of the battery monomer 500, thereby improving the assembly efficiency.

[0135] In some embodiments, the sealing rings 41 and the connecting pieces 42 are integrally formed, that is, both are made of the same material and are formed together in the same process.

[0136] In the embodiments of the present application, the sealing rings 41 and the connecting pieces 42 are integrally formed, so that the structural reliability between the sealing rings 41 and the connecting pieces 42 can be improved. In this way, the welding process can also be cancelled, the adverse effects of the welding process on the sealing rings 41 and the connecting pieces 42 are reduced, and the corresponding structural reliability of the sealing rings 41 and the connecting pieces 42 is improved.

[0137] In some embodiments, as shown in FIGS. 4-6, the sealing rings 41 include first portions 411 located away from the electrode assembly 20 of the first wall 11, and the connecting pieces 42 are connected to different first portions 411. In the thickness direction X of the first wall 11, the size H2 of the connecting pieces 42 is smaller than the size H1 of the first portions 411.

[0138] As can be known from the foregoing, the sealing rings 41 are structures in the sealing member 40 for sealing the electrode lead-out hole 12, and the connecting pieces 42 are structures in the sealing member 40 for achieving the relative fixation between different sealing rings 41. In other words, in the battery monomer 500, the sealing rings 41 are used to play a sealing role, and the connecting pieces 42 generally do not play a sealing role.

[0139] Further, the sealing ring 41 includes a first portion 411 located on the side of the first wall 11 away from the electrode assembly 20. According to actual needs, the sealing ring 41 can only include the first portion 411 located on the side of the first wall 11 away from the electrode assembly 20, or the sealing ring 41 can further include a second portion located in the electrode lead-out hole 12 in addition to the first portion 411, and the first portion 411 is connected to the second portion.

[0140] In order to improve the sealing reliability of the battery monomer 500, the first portion 411 needs to be compressed by the terminal body 31 and the first wall 11 to generate a certain compression in the battery monomer 500. On this basis, if the size of the connecting piece 42 in the thickness direction X is not less than the size of the first portion 411, the connecting piece 42 will also be compressed. In this case, the connecting piece 42 will exert a certain force on the part of the first wall 11 located between the adjacent electrode lead-out holes 12, and the strength of the part of the first wall 11 located between the adjacent electrode lead-out holes 12 is usually low, so the force exerted by the connecting piece 42 on the first wall 11 is easy to cause the deformation risk of the first wall 11, which is not conducive to the normal use of the battery monomer 500.

[0141] In the embodiment of the present application, the size of the connecting piece 42 in the thickness direction X is set to be smaller than the size of the first portion 411, so that in the battery monomer 500, the first portion 411 can be compressed to improve the sealing reliability, and the connecting piece 42 will not be compressed or the compression degree is low, thereby reducing the size of the force exerted by the connecting piece 42 on the first wall 11, reducing the risk of deformation of the part of the first wall 11 located between the adjacent electrode lead-out holes 12, and improving the reliability of the battery monomer 500.

[0142] In some embodiments, referring to FIGS. 4-8, the first wall 11 includes a reinforcing rib structure J located between the adjacent electrode lead-out holes 12.

[0143] Due to the existence of the electrode lead-out hole 12, the structural strength of the local structure of the first wall 11 between the adjacent electrode lead-out holes 12 is usually low. In order to improve the deformation resistance of the first wall 11, the embodiment of the present application provides the reinforcing rib structure J between the adjacent electrode lead-out holes 12, so as to improve the structural strength of the first wall 11 at the position between the adjacent electrode lead-out holes 12, reduce the risk of excessive deformation of the first wall 11, and improve the reliability of the battery monomer 500.

[0144] It should be noted that the reinforcing structure J can have various structural forms. For example, the first wall 11 can include a wall body between adjacent electrode lead holes 12, as shown in FIGS. 5 and 8, the reinforcing structure J can be located on the side of the wall body facing the electrode assembly 20, or as shown in FIGS. 5 and 7, the reinforcing structure J can also be located on the side of the wall body away from the electrode assembly 20. Further optionally, the reinforcing structure J is located on the side of the wall body away from the electrode assembly 20, and the reinforcing structure J is arranged corresponding to the connecting piece 42.

[0145] In some embodiments, as shown in FIGS. 5 and 6, the first wall 11 includes a terminal mounting portion 13 and a boss structure 15 protruding on the side of the terminal mounting portion 13 away from the electrode assembly 20, the electrode lead hole 12 penetrates the terminal mounting portion 13, and the boss structure 15 is arranged around the outer peripheral side of the electrode lead hole 12. The boss structure 15 is snap-fitted with the sealing member 40.

[0146] The terminal mounting portion 13 is a partial structure of the first wall 11 for mounting the electrode terminal 30, and the electrode lead hole 12 and the boss structure 15 are both arranged on the terminal mounting portion 13. The boss structure 15 protrudes from the surface of the terminal mounting portion 13 away from the electrode assembly 20 and is arranged around the outer peripheral side of the electrode lead hole 12. The boss structure 15 is snap-fitted with the sealing member 40 to achieve positioning of the sealing member 40 relative to the first wall 11.

[0147] Specifically, as shown in FIG. 6, the boss structure 15 protrudes towards the sealing ring 41, and the side of the sealing ring 41 facing the first wall 11 can be provided with a groove structure 43, and the boss structure 15 is at least partially located in the groove structure 43, thereby achieving snap-fitting between the boss structure 15 and the sealing member 40.

[0148] In the embodiments of the present application, the boss structure 15 is provided on the first wall 11, and the boss structure 15 is snap-fitted with the sealing member 40, thereby improving the mounting reliability between the sealing member 40 and the first wall 11. The presence of the boss structure 15 can also serve to position and limit the sealing member 40, thereby improving the relative position reliability between the first wall 11 and the sealing member 40.

[0149] In some embodiments, referring to FIGS. 4, 5 and 9, the battery monomer 500 further includes an insulating member 50, which is arranged around part of the peripheral side of the electrode terminal 30. In the thickness direction X of the first wall 11, the insulating member 50 is partially located between and connected to the first wall 11 and the electrode terminal 30.

[0150] The insulating member 50 includes insulating material and is used to insulate and separate the first wall 11 from the electrode terminal 30. Specifically, the insulating member 50 is partially disposed around the periphery of the electrode terminal 30 to insulate and separate the periphery of the electrode terminal 30 from the first wall 11. Furthermore, in this embodiment, a portion of the insulating member 50 is disposed along the thickness direction X between the first wall 11 and the electrode terminal 30, thereby further insulating and separating the electrode terminal 30 from the first wall 11 and improving the reliability of power transfer corresponding to the battery cell 500.

[0151] Furthermore, in this embodiment, the portion of the insulating member 50 located between the first wall 11 and the electrode terminal 30 in the thickness direction X is configured to connect to both the first wall 11 and the electrode terminal 30, thereby providing a certain degree of resistance to deformation. Specifically, as described above, the portion of the sealing member 40 located between the electrode terminal 30 and the first wall 11 in the thickness direction X, which serves a sealing function, will be compressed and deformed after being applied to the battery cell 500. That is, the first portion 411 will be compressed and deformed, and the first portion 411 will also exert a certain reverse force on the first wall 11. This reverse force causes the first wall 11 to tend to deform towards the electrode assembly 20. Since the insulating member 50 can connect to the first wall 11 and the electrode terminal 30, when the first wall 11 deforms, the insulating member 50 can apply a certain force to the first wall 11 to hinder its deformation, thereby providing a certain degree of resistance to deformation. The insulating member 50 can be connected and fixed to the first wall 11 by means of bonding or snap-fitting.

[0152] In summary, in this embodiment, the insulating member 50 not only serves to insulate and separate the electrode terminal 30 from the first wall 11 to meet the insulation requirements of the electrode terminal 30, but also, by connecting to the first wall 11, enables the first wall 11 to have a certain resistance to deformation, thereby improving the overall structural reliability of the battery cell 500 and making it highly practical.

[0153] In some embodiments, as shown in FIG9, the insulating member 50 includes a support portion 51, a first protrusion 52 protruding from the side of the support portion 51 opposite to the electrode assembly 20, and a second protrusion 53 protruding from the side of the support portion 51 facing the electrode assembly 20. The first protrusion 52 is inserted into the electrode terminal 30, and the second protrusion 53 is inserted into the first wall 11.

[0154] The support portion 51 is a main structure in the insulating member 50, and the first protruding portion 52 and the second protruding portion 53 are respectively protrudingly arranged on different sides of the support portion 51 in the thickness direction X. The first protruding portion 52 and the second protruding portion 53 can have various connection modes with respect to the support portion 51. Alternatively, the first protruding portion 52, the second protruding portion 53, and the support portion 51 can be formed of the same material and formed together in the same process, that is, the first protruding portion 52, the second protruding portion 53, and the support portion 51 can be an integrally formed structure.

[0155] Further, the number of the first protruding portion 52 can also be one or multiple. Alternatively, the number of the first protruding portion 52 is multiple, and the multiple first protruding portions 52 are protrudingly arranged on the side of the support portion 51 away from the electrode assembly 20 and spaced apart from each other. The same applies to the second protruding portion 53, and details are not described herein.

[0156] In the embodiment, the first protruding portion 52 of the insulating member 50 is connected to the electrode terminal 30 in a plug-in manner, and the second protruding portion 53 is connected to the first wall 11 in a plug-in manner. Compared with other connection modes, the plug-in connection mode is simple to operate and can fix the insulating member 50 with respect to the electrode terminal 30 and the first wall 11. Further, the first protruding portion 52 and the second protruding portion 53 are both fixed to the support portion 51. When the first wall 11 is deformed, the support portion 51 can provide a certain stress to the first wall 11, so that the first wall 11 has a certain anti-deformation ability, and the overall structural reliability of the battery monomer 500 is improved.

[0157] In some embodiments, the electrode terminal 30 includes a terminal body 31 located on the side of the first wall 11 away from the electrode assembly 20, and the terminal body 31 has a first surface M1 facing the electrode assembly 20 and a first recess 33 recessed inward from the first surface M1. In the direction from the electrode assembly 20 to the electrode terminal 30, the radial dimension of the first recess 33 gradually increases, and the first protruding portion 52 is located in the first recess 33. And / or, the first wall 11 includes a terminal mounting portion 13 having a second surface M2 away from the electrode assembly 20 and electrode lead-out holes 12 and a second recess 14 recessed inward from the second surface M2 and distributed in a staggered manner. In the direction from the electrode assembly 20 to the electrode terminal 30, the radial dimension of the second recess 14 gradually decreases, and the second protruding portion 53 is located in the second recess 14.

[0158] The first recess 33 and the second recess 14 are respectively used to realize the connection requirements of the insulating piece 50 relative to the electrode terminal 30 and the first wall 11. Specifically, taking the electrode terminal 30 provided with the first recess 33 as an example, the first recess 33 is arranged on the side of the terminal body 31 facing the support part 51, and the first protruding part 52 can be embedded in the first recess 33 to realize the plug-in fixing between the electrode terminal 30 and the insulating piece 50. Further, in the direction of the electrode assembly 20 pointing to the electrode terminal 30, the radial dimension of the first recess 33 gradually increases, that is, the cross-sectional dimension of the first recess 33 gradually increases, in other words, the side wall corresponding to the first recess 33 is not parallel to the thickness direction X, but has a certain inclination angle relative to the thickness direction X.

[0159] On this basis, if the first protruding part 52 has a tendency to separate from the first recess 33 due to external force or other factors, since the side wall of the first recess 33 is inclined relative to the thickness direction X, the side wall of the first recess 33 can hinder the first protruding part 52 from separating from the first recess 33, thereby improving the positional reliability between the insulating piece 50 and the electrode terminal 30, and further improving the positional reliability between the electrode terminal 30 and the first wall 11.

[0160] Similarly, taking the first wall 11 provided with the second recess 14 as an example, the first wall 11 is provided with a terminal mounting part 13, which is a part of structure of the first wall 11 for mounting the electrode terminal 30. The second recess 14 is arranged on the side of the terminal mounting part 13 facing the support part 51, and the second protruding part 53 can be embedded in the second recess 14 to realize the plug-in fixing between the first wall 11 and the insulating piece 50. Further, in the direction of the electrode assembly 20 pointing to the electrode terminal 30, the radial dimension of the second recess 14 gradually decreases, that is, the cross-sectional dimension of the second recess 14 gradually decreases, in other words, the side wall corresponding to the second recess 14 is not parallel to the thickness direction X, but has a certain inclination angle relative to the thickness direction X.

[0161] On this basis, if the second protruding part 53 has a tendency to separate from the second recess 14 due to external force or other factors, since the side wall of the second recess 14 is inclined relative to the thickness direction X, the side wall of the second recess 14 can hinder the second protruding part 53 from separating from the second recess 14, thereby improving the positional reliability between the insulating piece 50 and the first wall 11, and further improving the positional reliability between the electrode terminal 30 and the first wall 11.

[0162] In conclusion, in the embodiments of the present application, at least one of the first recess 33 and the second recess 14 is arranged, thereby improving the connection reliability of the insulating member 50 relative to at least one of the first wall 11 and the electrode terminal 30, and further improving the relative position reliability between the first wall 11 and the electrode terminal 30, so as to improve the corresponding deformation resistance of the first wall 11, which has strong practicability. Further, the first recess 33 and the second recess 14 can exist in the battery cell 500 at the same time.

[0163] In some embodiments, referring to FIG. 10, the battery cell further includes a current collecting member 70 connected to the tab, the current collecting member 70 is provided with a connecting hole 71, and the electrode terminal 30 is partially located in the connecting hole 71 and is welded and fixed with the current collecting member 70.

[0164] The current collecting member 70 is used to realize the electrical connection between the tab and the electrode terminal 30 in the battery cell, and further, the connecting hole 71 is arranged on the current collecting member 70, which is used to realize the welding and fixation between the electrode terminal 30 and the current collecting member 70. Specifically, the electrode terminal 30 includes a terminal body 31 and a plurality of connecting portions 32, the terminal body 31 is located on the side of the first wall 11 away from the electrode assembly 20, and at least part of the connecting portions 32 pass through the electrode lead-out hole 12 and extend into the space where the electrode assembly 20 is located, so as to be welded and fixed with the current collecting member 70 at the connecting hole 71.

[0165] In the embodiments of the present application, the connecting hole 71 is arranged in the current collecting member 70, so that the relative positioning between the current collecting member 70 and the electrode terminal 30 can be realized by means of the connecting hole 71, thereby improving the position reliability therebetween. Meanwhile, this design can also reduce the distance between the current collecting member 70 and the first wall 11 in the thickness direction X, so that the part of the current collecting member 70 between the adjacent connecting holes 71 can support the first wall 11 to some extent, thereby further improving the corresponding deformation resistance of the first wall 11.

[0166] It should be noted that there can be an insulating structure such as a lower plastic between the first wall 11 and the current collecting member 70, wherein the current collecting member 70 can be arranged in abutment with the lower plastic, or the two can be arranged in a spaced manner.

[0167] In some embodiments, in the thickness direction X, the orthogonal projection of the electrode lead-out hole 12 covers and exceeds the orthogonal projection of the connecting hole 71. The distance between the inner wall surface of the electrode lead-out hole 12 and the inner wall surface of the connecting hole 71 in the direction parallel to the first wall 11 is D, and D satisfies: 0 < D ≤ 3 mm. Optionally, D can be one of 0.1 mm, 0.5 mm, 1 mm, 2 mm and 3 mm.

[0168] The connection hole 71 is arranged so that the current collecting member 70 and the electrode terminal 30 can be fixed by butt welding. Butt welding refers to a method of connecting two metal parts that are in close contact under certain temperature and pressure by high-temperature melting and then cooling and solidifying. In order to reduce the adverse effects of the welding process on the first wall 11, the inner wall surface of the electrode lead-out hole 12 and the inner wall surface of the connection hole 71 are spaced apart by a distance D, thereby improving the reliability of the structure of the first wall 11.

[0169] Further, compared with penetration welding, the butt welding process corresponds to a smaller size of the heat-affected zone, so the size of the distance D can be appropriately reduced, so that D is not greater than 3 mm. Thus, the distance B between adjacent different connection holes 71 is reduced. The support strength of the part of the current collecting member 70 between the adjacent connection holes 71 on the first wall 11 is often related to the distance A. Specifically, the greater the distance B, the greater the size of the part of the current collecting member 70 between the adjacent connection holes 71 in the direction parallel to the first wall 11, and thus the part is more likely to deform, and the support effect on the first wall 11 is worse.

[0170] Therefore, in the embodiments of the present application, by arranging the connection hole 71 in the current collecting member 70, the current collecting member 70 and the electrode terminal 30 can be connected and fixed by butt welding, thereby reducing the adverse effects of the welding process on the first wall 11, reducing the size of the distance D, and further reducing the distance B between adjacent different connection holes 71. In this way, the anti-deformation ability of the part of the current collecting member 70 between the adjacent connection holes 71 and the support ability of the part on the first wall 11 are improved, and the structural reliability of the first wall 11 during use is improved.

[0171] In some embodiments, referring to FIG. 11, the battery monomer 500 further includes a current collecting member 70, and the tab 21 is electrically connected to the electrode terminal 30 through the current collecting member 70. The current collecting member 70 includes a main body part 72 and a plurality of protruding parts 73 protruding from the main body part 72, the protruding parts 73 are at least partially located in the electrode lead-out hole 12 and connected to the electrode terminal 30.

[0172] The current collecting member 70 is used to realize the electrical connection between the tab and the electrode terminal 30 in the battery monomer, the main body part 72 is the main component of the current collecting member 70, and the protruding part 73 is connected to the main body part 72 and used to penetrate into the electrode lead-out hole 12 to realize the connection with the electrode terminal 30. The number of the protruding parts 73 can correspond to the number of the electrode lead-out hole 12, that is, a plurality of protruding parts 73 penetrate into a plurality of electrode lead-out holes 12 and are connected to the electrode terminal 30.

[0173] It should be noted that, due to the presence of the protrusion 73, the electrode terminal 30 can be completely located on the side of the first wall 11 away from the electrode assembly 20, that is, the electrode terminal 30 only includes the terminal body 31, and the protrusion 73 is connected to the terminal body 31. Alternatively, the electrode terminal 30 can also be partially located in the electrode lead-out hole 12, that is, the electrode terminal 30 simultaneously includes the terminal body 31 and the connecting portion 32, the connecting portion 32 is completely located in the electrode lead-out hole 12, and the protrusion 73 is connected to the connecting portion 32.

[0174] In the embodiment of the present application, the protrusion 73 is arranged in the current collecting member 70, and the protrusion 73 is deeply arranged in the electrode lead-out hole 12, so as to realize the connection between the electrode terminal 30 and the electrode terminal 30. This design makes the electrode terminal 30 not need to enter the space where the electrode assembly 20 is located, so as to reduce the occupation of the internal space of the shell 10 by the electrode terminal 30, and improve the energy density of the battery monomer.

[0175] In some embodiments, referring to FIG. 12, the first wall 11 includes a third surface M3 facing the electrode assembly 20, the electrode terminal 30 is partially arranged beyond the third surface M3 and connected to the tab 21.

[0176] In the embodiment of the present application, the electrode terminal 30 can enter the space where the electrode assembly 20 is located through the electrode lead-out hole 12, and the electrode terminal 30 can also be partially arranged beyond the third surface M3. On this basis, the electrode terminal 30 is directly connected to the tab 21, so as to cancel the arrangement of the current collecting member, thereby simplifying the structural layout in the battery monomer.

[0177] In some embodiments, referring to FIG. 13, the battery monomer 500 further includes a current collecting member 70 connected to the tab 21, the first wall 11 includes a third surface M3 facing the electrode assembly 20, the electrode terminal 30 is partially arranged beyond the third surface M3 and connected to the surface of the current collecting member 70 facing the electrode terminal 30.

[0178] In the embodiment of the present application, the electrode terminal 30 can enter the space where the electrode assembly 20 is located through the electrode lead-out hole 12, and the electrode terminal 30 can also be partially arranged beyond the third surface M3. On this basis, the electrode terminal 30 can be connected to the current collecting member 70 through the penetrating welding, and the electrode terminal is electrically connected to the tab 21 through the current collecting member 70. In a second aspect, the embodiment of the present application provides a battery including the battery monomer 500 in any of the preceding embodiments.

[0179] It should be noted that the battery provided by the embodiment of the present application has the beneficial effects of the battery monomer 500 in any of the preceding embodiments, and specific details are described above with respect to the beneficial effects of the battery monomer 500. The embodiment of the present application will not be described again.

[0180] In a third aspect, the embodiments of the present application provide a power consuming device, the power consuming device comprising the battery cell 500 in any of the foregoing embodiments, and the battery cell 500 is configured to provide electric energy.

[0181] It should be noted that the power consuming device provided by the embodiments of the present application has the beneficial effects of the battery cell 500 in any of the foregoing embodiments, and specific descriptions are made with reference to the foregoing descriptions of the beneficial effects of the battery cell 500, which will not be repeated herein.

[0182] According to some embodiments of the present application, referring to FIGS. 4-9, the battery cell 500 comprises a housing 10, an electrode assembly 20, an electrode terminal 30, a fixing member 60, an insulating member 50, and a sealing member 40. The housing 10 comprises a first wall 11 provided with a plurality of electrode lead-out holes 12. The electrode assembly 20 is arranged in the housing 10 and comprises a tab 21. The electrode terminal 30 comprises a terminal body 31 and a plurality of connecting portions 32. The terminal body 31 is located on a side of the first wall 11 away from the electrode assembly 20. The connecting portions 32 are at least partially located in the electrode lead-out holes 12. The fixing member 60 is arranged around the terminal body 31. In the thickness direction X, the terminal body 31 is partially clamped between the fixing member 60 and the first wall 11. The insulating member 50 is at least partially located between the fixing member 60 and the terminal body 31.

[0183] The sealing member 40 comprises a plurality of sealing rings 41 arranged around the connecting portions 32 and a connecting member 42 connecting different sealing rings 41. The sealing rings 41 and the connecting member 42 are integrally formed. The sealing ring 41 comprises a first portion 411 located on a side of the first wall 11 away from the electrode assembly 20. The connecting member 42 is connected to different first portions 411. In the thickness direction X, the size of the connecting member 42 is smaller than the size of the first portion 411.

[0184] The first wall 11 comprises a reinforcing rib structure J located between adjacent electrode lead-out holes 12. In the thickness direction X, the insulating member 50 is partially located between the first wall 11 and the electrode terminal 30 and connects the first wall 11 and the electrode terminal 30. The insulating member 50 comprises a support portion 51, a first protruding portion 52 protruding from a side of the support portion 51 away from the electrode assembly 20, and a second protruding portion 53 protruding from a side of the support portion 51 toward the electrode assembly 20. The first protruding portion 52 is connected to the electrode terminal 30 by insertion. The second protruding portion 53 is connected to the first wall 11 by insertion.

[0185] The terminal body 31 has a first surface M1 facing the electrode assembly 20, and a first recess 33 formed by the first surface M1 being recessed inwardly. In the direction in which the electrode assembly 20 points to the electrode terminal 30, the cross-sectional size of the first recess 33 has a gradually increasing tendency, and the first protrusion 52 is located in the first recess 33. The first wall 11 includes a terminal connecting portion 32 having a second surface M2 facing away from the electrode assembly 20, and an electrode lead-out hole 12 and a second recess 14 formed by the second surface M2 being recessed inwardly and being distributed in a staggered manner. In the direction in which the electrode assembly 20 points to the electrode terminal 30, the cross-sectional size of the second recess 14 has a gradually decreasing tendency, and the second protrusion 53 is located in the second recess 14.

[0186] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. 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, comprising: a housing including a first wall provided with a plurality of electrode lead-out holes; an electrode assembly disposed in the housing and including a tab; an electrode terminal disposed on the first wall and electrically connected to the tab, a single one of the electrode terminals covering the plurality of electrode lead-out holes in a thickness direction of the first wall; and a seal disposed at least partially between the first wall and the electrode terminal and sealing the plurality of electrode lead-out holes. The electrode terminal includes a terminal body located on a side of the first wall facing away from the electrode assembly and a plurality of connecting portions at least partially located in the electrode lead-out holes; 2. The battery cell of claim 1, wherein, At least a portion of the seal is located between the terminal body and the first wall. 3.The battery cell of claim 2, further comprising a fixing member disposed around a peripheral side of the terminal body and partially sandwiching the terminal body between the fixing member and the first wall in the thickness direction; and an insulating member at least partially located between the fixing member and the terminal body. The seal includes a plurality of seal rings disposed around the peripheral sides of the connecting portions. The seal further includes a connecting member connecting different ones of the seal rings.

4. The battery cell of claim 2, wherein, The seal rings and the connecting member are integrally formed.

5. The battery cell of claim 4, wherein, The seal rings include a first portion located on a side of the first wall facing away from the electrode assembly, and the connecting member is connected to different ones of the first portions.

6. The battery cell of claim 5, wherein, In the thickness direction of the first wall, the connecting member has a size smaller than a size of the first portion.

7. The battery cell of claim 4, wherein, 8.The battery cell of claim 2, wherein the first wall includes a reinforcing rib structure located between adjacent ones of the electrode lead-out holes. The first wall includes a terminal mounting portion and a boss structure protruding from a side of the terminal mounting portion facing away from the electrode assembly, the electrode lead-out holes penetrating the terminal mounting portion, and the boss structure being disposed around an outer peripheral side of the electrode lead-out holes. The boss structure is snap-fitted with the seal.

9. The battery cell of claim 1, wherein, 10.The battery cell of claim 1, further comprising an insulating member disposed partially around a peripheral side of the electrode terminal. In the thickness direction of the first wall, a portion of the insulating member is located between and connects the first wall and the electrode terminal. The insulating member includes a support portion, a first protruding portion protruding from a side of the support portion facing away from the electrode assembly, and a second protruding portion protruding from a side of the support portion facing toward the electrode assembly. The first protruding portion is snap-fitted with the electrode terminal, and the second protruding portion is snap-fitted with the first wall.

11. The battery cell of claim 10, wherein, The electrode terminal includes a terminal body located on a side of the first wall facing away from the electrode assembly, the terminal body having a first surface facing toward the electrode assembly and a first recess formed by the first surface being recessed inwardly; In a direction of the electrode assembly pointing toward the electrode terminal, a radial dimension of the first recess gradually increases, and the first protruding portion is located in the first recess; and / or, 12. The battery cell of claim 11, wherein, ​ ​ ​ The first wall comprises a terminal mounting portion having a second surface facing away from the electrode assembly, and the electrode lead-out hole and a second recess formed inwardly from the second surface and distributed in a staggered manner; In a direction in which the electrode assembly points to the electrode terminal, a radial dimension of the second recess gradually decreases, and the second protruding portion is located in the second recess.

13. The battery cell according to claim 1, further comprising a current collecting member connected to the tab; The current collecting member is provided with a connecting hole, and the electrode terminal portion is located in the connecting hole and is welded and fixed to the current collecting member. In the thickness direction, a projection of the electrode lead-out hole covers and exceeds a projection of the connecting hole; 14. The battery cell of claim 13, wherein, An inner wall surface of the electrode lead-out hole and an inner wall surface of the connecting hole are parallel to the first wall and are spaced apart by a distance D, and D satisfies: 0 < D ≤ 3 mm.

15. The battery cell according to claim 1, further comprising a current collecting member, and the tab is electrically connected to the electrode terminal through the current collecting member; The current collecting member comprises a main body portion and a plurality of protruding portions protruding from the main body portion, and the protruding portions are at least partially located in the electrode lead-out hole and are connected to the electrode terminal. The first wall comprises a third surface facing the electrode assembly, and the electrode terminal portion is located beyond the third surface and is connected to the tab.

16. The battery cell of claim 1, wherein, 17. The battery cell according to claim 1, further comprising a current collecting member connected to the tab; The first wall comprises a third surface facing the electrode assembly, and the electrode terminal portion is located beyond the third surface and is connected to a surface of the current collecting member facing the electrode terminal.

18. A battery comprising the battery cell according to any one of claims 1 to 17.

19. An electric device comprising the battery cell according to any one of claims 1 to 17, and the battery cell is used to provide electric energy. ​

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